FIELD
[0001] The present invention relates to a plate heat exchanger used as a condenser and an
evaporator.
BACKGROUND
[0002] Conventionally, the plate heat exchanger includes a plurality of heat transfer plates.
Each of the plurality of heat transfer plates includes a heat transfer portion. The
heat transfer portion has a first surface and a second surface in a first direction.
Specifically, the heat transfer portion has the first surface on which ridges and
valleys are formed, and the second surface that faces an opposite side to the first
surface and on which valleys each serving as the back of each corresponding one of
the ridges on the first surface and ridges located on the back of the respective valleys
on the first surface are formed.
[0003] On each of the first surface and the second surface of the heat transfer portion,
the ridges intersect with a centerline (hereinafter referred to as vertical centerline)
of the heat transfer portion extending in a second direction orthogonal to the first
direction. The ridges are formed over the entire length of the heat transfer portion
in a third direction orthogonal to both the first direction and the second direction.
[0004] The plurality of heat transfer plates are stacked on each other in the first direction.
That is, each of the plurality of heat transfer plates has the first surface of its
heat transfer portion opposed to the first surface of the heat transfer portion of
each adjacent heat transfer plate aligned on one side of the first direction. Each
of the plurality of heat transfer plates has the second surface of its heat transfer
portion opposed to the second surface of the heat transfer portion of the adjacent
heat transfer plate aligned on the other side of the first direction.
[0005] In this state, the ridges on the heat transfer portions of each two adjacent heat
transfer plates cross and abut against each other, and the valleys on the heat transfer
portions form spaces between the heat transfer portions of each two adjacent heat
transfer plates. That is, a first flow channel for circulating a first fluid medium
in the second direction is formed between the first surfaces of the heat transfer
portions of each two adjacent heat transfer plates. Also, a second flow channel for
circulating a second fluid medium in the second direction is formed between the second
surfaces of the heat transfer portions of each two adjacent heat transfer plates.
With this configuration, the plate heat exchanger enables heat exchange between the
first fluid medium within the first flow channels and the second fluid medium within
the second flow channels, through the heat transfer portions that separate the first
flow channels and the second flow channels (see, for example, Patent Literature 1).
[0006] There are some cases where the plate heat exchanger of this type is used as a condenser
that is configured to condense the second fluid medium within the second flow channels
through the heat exchange between the first fluid medium within the first flow channels
and the second fluid medium within the second flow channels. There are also other
cases where the plate heat exchanger of this type is used as an evaporator that is
configured to evaporate the second fluid medium within the second flow channels through
the heat exchange between the first fluid medium within the first flow channels and
the second fluid medium within the second flow channels.
[0007] However, the conventional plate heat exchanger, when used as the condenser or the
evaporator, has a limit in improving heat exchange performance due to the characteristics
of the second fluid medium, which is subjected to condensation or evaporation.
[0008] Specifically, the ridges on each of the heat transfer portions are formed crossing
the vertical centerline of the heat transfer portion and extending over the entire
length of the heat transfer portion in the third direction. This configuration causes
the ridges of the heat transfer portion to increase circulating resistance of both
the first flow channels and the second flow channels.
Generally, a fluid medium that does not cause phase change (a fluid medium having
single-phase flow) is employed as the first fluid medium. Therefore, increase in the
circulating resistance in the first flow channels causes the heat transfer portions
to be more likely to be subjected to thermal influences. The increase in the circulating
resistance in the first flow channels consequently becomes a factor for improved heat
exchange performance.
[0009] In contrast, a fluid medium that causes phase change (a fluid medium having two-phase
flow that contains liquid and gas), such as fluorocarbons, is employed as the second
fluid medium. As a result, liquid film of the second fluid medium is formed on the
second surfaces of the heat transfer portions that define the second flow channels.
For the purpose of improving the heat transfer performance, therefore, it is necessary
to increase the velocity of the second fluid medium and disturb flow of the liquid
film formed on the second surfaces of the heat transfer portions.
[0010] However, since the ridges on each of the heat transfer portions are formed crossing
the vertical centerline of the heat transfer portion and extending over the entire
length in the third direction of the heat transfer portion, the ridges on the heat
transfer portions block flow of the second fluid medium within the second flow channels.
That is, the ridges on the second surfaces of the heat transfer portions are formed
to cross (intersect with) the flow of the second fluid medium within the second flow
channels, and thereby increase the circulating resistance of the second fluid medium
within the second flow channels.
[0011] Therefore, the conventional plate heat exchanger has a limit in increasing the velocity
of the second fluid medium within the second flow channels, and thus cannot sufficiently
disturb the flow of the liquid film of the second fluid medium formed on the second
surfaces of the heat transfer portions.
[0012] Hence, the conventional plate heat exchanger has a limit in improving the performance
for transferring, to the heat transfer portion, heat of the second fluid medium that
is circulated through the second flow channels.
CITATION LIST
Patent Literature
SUMMARY
Technical Problem
[0014] It is therefore an object of the present invention to provide a plate heat exchanger
capable of improving performance for transferring, to the heat transfer portions,
heat of the second fluid medium that causes the phase change as a result of its heat
exchange with the first fluid medium.
Solution to Problem
[0015] A plate heat exchanger of the present invention includes a plurality of heat transfer
plates each including a heat transfer portion having a first surface on which ridges
and valleys are formed, and a second surface that is opposed to the first surface
and on which valleys being in a front-back relationship with the ridges of the first
surface and ridges being in a front-back relationship with the valleys of the first
surface are formed, the plurality of heat transfer plates respectively having the
heat transfer portions stacked on each other in a first direction, wherein the first
surface of the heat transfer portion of each of the plurality of heat transfer plates
is arranged opposed to the first surface of the heat transfer portion of one of the
plurality of heat transfer plates adjacent to the each heat transfer plate on one
side in the first direction, and the second surface of the heat transfer portion of
each of the plurality of heat transfer plates is arranged opposed to the second surface
of the heat transfer portion of one of the plurality of heat transfer plates adjacent
to the each heat transfer plate on an other side in the first direction, wherein a
first flow channel through which a first fluid medium is circulated in a second direction
orthogonal to the first direction is formed between the first surfaces of the heat
transfer portions of each adjacent two of the plurality of heat transfer plates, and
a second flow channel through which a second fluid medium is circulated in the second
direction is formed between the second surfaces of the heat transfer portions of each
adjacent heat transfer plates, wherein each of the heat transfer portions of each
adjacent two of the plurality of heat transfer plates includes: as the ridges formed
on the first surface, a plurality of first ridges arranged at intervals from each
other in a direction intersecting with the first direction and the second direction,
the plurality of first ridges extending in the second direction or in a synthetic
direction that has a component in the second direction, and at least one barrier ridge
that is lower than the plurality of first ridges formed on the first surface, the
at least one barrier ridge extending in a direction intersecting with the plurality
of first ridges; as the valleys formed on the first surface, a plurality of first
valleys each formed between each adjacent two of the plurality of first ridges in
the direction intersecting with the first direction and the second direction; and,
as the valleys formed on the second surface, a plurality of second valleys being in
a front-back relationship with the plurality of first ridges, wherein each of the
plurality of first ridges of one of each adjacent two of the plurality of heat transfer
plates is located between each adjacent two of the plurality of first ridges of the
opposed heat transfer plate, wherein the at least one barrier ridge on each of each
adjacent two of the plurality of heat transfer plates has a longitudinal dimension
set to be shorter than the entire length in a third direction of the heat transfer
portion, the third direction being orthogonal to the first direction and the second
direction, and wherein the at least one barrier ridge on one of each adjacent two
of the plurality of heat transfer plates is arranged at a position displaced in at
least one of the second direction and the third direction from the at least one barrier
ridge on the opposed heat transfer plate, and crosses and abuts against the plurality
of first ridges of the opposed heat transfer plate.
[0016] According to one aspect of the present invention, the configuration may be such that
each of the heat transfer portions of each adjacent two of the plurality of heat transfer
plates includes a plurality of barrier ridges, and the plurality of barrier ridges
are aligned at intervals from each other in the second direction.
[0017] According to another aspect of the present invention, it is preferable that the heat
transfer portion of one heat transfer plate out of each adjacent two of the plurality
of heat transfer plates have at least one row constituted by a plurality of barrier
ridges arranged at intervals from each other in the second direction, the heat transfer
portion of the other heat transfer plate out of the each adjacent two of the plurality
of heat transfer plates have at least two rows each constituted by a plurality of
barrier ridges arranged at intervals from each other in the second direction, and
each of the at least one row on the one heat transfer plate out of the each adjacent
two of the plurality of heat transfer plates be positioned between each adjacent two
of the at least two rows on the other heat transfer plate out of the each adjacent
two of the plurality of heat transfer plates.
[0018] In this case, it is preferable that each of the plurality of barrier ridges constituting
the at least one row on the one heat transfer plate out of the each adjacent two of
the plurality of heat transfer plates be positioned between each adjacent two of the
plurality of barrier ridges constituting each of the at least two rows on the other
heat transfer plate out of the each adjacent two of the plurality of heat transfer
plates.
[0019] According to another aspect of the present invention, each of the at least one barrier
ridge may extend straight in the third direction.
[0020] According to still another aspect of the present invention, it is preferable that
each of the heat transfer portions of each adjacent two of the plurality of heat transfer
plates include, as the ridges formed on the second surface, a plurality of second
ridges being in a front-back relationship with the plurality of first valleys, and
that the plurality of second ridges of one of each adjacent two of the plurality of
heat transfer plates be overlapped with the plurality of second ridges of the opposed
heat transfer plate and be in contact with top ends of the plurality of second ridges
of the opposed heat transfer plate.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021]
Fig. 1 is a perspective view of a plate heat exchanger according to a first embodiment
of the present invention.
Fig. 2 is an exploded perspective view of the plate heat exchanger according to the
embodiment, which includes circulation routes of a first fluid medium and a second
fluid medium.
Fig. 3 is a view of a heat transfer plate (first heat transfer plate) of the plate
heat exchanger according to the embodiment, as seen from its first surface side.
Fig. 4 is a view of the heat transfer plate (first heat transfer plate) of the plate
heat exchanger according to the embodiment, as seen from its second surface side.
Fig. 5 is a view of a heat transfer plate (second heat transfer plate) of the plate
heat exchanger according to the embodiment, as seen from its first surface side.
Fig. 6 is a view of the heat transfer plate (second heat transfer plate) of the plate
heat exchanger according to the embodiment, as seen from its second surface side.
Fig. 7 is a schematic view showing the circulation route of the first fluid medium
in first flow channels and the circulation route of the second fluid medium in second
flow channels, of the plate heat exchanger according to the embodiment.
Fig. 8 is a schematic partial cross-sectional view of the plate heat exchanger according
to the embodiment, as seen from a second direction thereof.
Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 8, with an illustration
of flows of the fluid media in the first flow channels and the second flow channels.
Fig. 10 is a cross-sectional view taken along line X-X in Fig. 8, with an illustration
of the flows of the fluid media in the first flow channels and the second flow channels.
Fig. 11 is a cross-sectional view taken along line XI-XI in Fig. 8, with an illustration
of the flows of the fluid media in the first flow channels and the second flow channels.
Fig. 12 is a view showing the flows of the first fluid medium within the first flow
channel in the plate heat exchanger according to the embodiment.
Fig. 13 is a view showing the flows of the second fluid medium within the second flow
channel in the plate heat exchanger according to the embodiment.
Fig. 14 is a schematic partial cross-sectional view of a plate heat exchanger according
to another embodiment of the present invention, as seen from a second direction thereof.
Fig. 15 is a schematic partial cross-sectional view of a plate heat exchanger according
to still another embodiment of the present invention, as seen from a second direction
thereof.
Fig. 16 is a schematic partial cross-sectional view of a plate heat exchanger according
to still another embodiment of the present invention, as seen from a second direction
thereof.
Fig. 17 is a schematic view showing a circulation route of a first fluid medium in
first flow channels and a circulation route of a second fluid medium in second flow
channels, of a plate heat exchanger according to still another embodiment of the present
invention.
Fig. 18 is a schematic view showing a circulation route of a first fluid medium in
first flow channels and a circulation route of a second fluid medium in second flow
channels, of a plate heat exchanger according to still another embodiment of the present
invention.
DESCRIPTION OF EMBODIMENTS
[0022] A description will be hereinafter made for a plate heat exchanger according to a
first embodiment of the present invention with reference to the attached drawings.
[0023] As shown in Fig. 1 and Fig. 2, a plate heat exchanger 1 according to the first embodiment
(hereinafter referred to simply as heat exchanger in this embodiment) includes three
or more heat transfer plates 2, 3.
[0024] The three or more heat transfer plates 2, 3 are stacked on each other in a first
direction. In the heat exchanger 1 according to this embodiment, the three or more
heat transfer plates 2, 3 are composed of two kinds of heat transfer plates. The two
kinds of heat transfer plates 2, 3 are arranged alternately in the first direction.
[0025] With this configuration, in the heat exchanger 1, first flow channels Ra through
which a first fluid medium A is circulated and second flow channels Rb through which
a second fluid medium B is circulated are alternately formed in the first direction
with the heat transfer plates 2, 3 respectively interposed therebetween.
[0026] The two kinds of heat transfer plates 2, 3 will be specifically described. The two
kinds of heat transfer plates 2, 3 have common features and different features. First,
the common features of the two kinds of heat transfer plates 2, 3 will be described.
[0027] As shown in Fig. 3 to Fig. 6, the heat transfer plates 2, 3 respectively include
heat transfer portions 20, 30 that respectively have first surfaces Sa1, Sb1 and second
surfaces Sa2, Sb2 facing opposite to the first surfaces Sa1, Sb1, and annular fitting
portions 21, 31 that respectively extend from the entire outer peripheral edges of
the heat transfer portions 20, 30 while having surfaces extending in a direction intersecting
with the surfaces of the heat transfer portions 20, 30.
[0028] The heat transfer portions 20, 30 have a thickness in the first direction. Accordingly,
the first surfaces Sa1, Sb1 and the second surfaces Sa2, Sb2 of the heat transfer
portions 20, 30 are aligned in the first direction. The heat transfer portions 20,
30 have an external form (contour) defined by a pair of long sides extending in a
second direction orthogonal to the first direction, and a pair of short sides arranged
with a distance from each other in the second direction while extending in a third
direction orthogonal to the first direction and the second direction to connect the
pair of long sides. That is, the heat transfer portions 20, 30 have an external form
having a rectangular shape with the long sides extending in the second direction,
when seen from the first direction.
[0029] Each of the heat transfer portions 20, 30 has one end and the other end on the opposite
side to the one end in the second direction. The heat transfer portions 20, 30 respectively
have at least two openings 200, 201, 202, 203, 300, 301, 302, 303 in each of the one
ends and the other ends in the second direction. In this embodiment, the heat transfer
portions 20, 30 respectively have two openings 200, 203, 300, 303 in the one ends
in the second direction, and two openings 201, 202, 301, 302 in the other ends in
the second direction.
[0030] The two openings 200, 203, 300, 303 in the one ends in the second direction of the
heat transfer portions 20, 30 are aligned in the third direction. The two openings
201, 202, 301, 302 in the other ends in the second direction of the heat transfer
portions 20, 30 are aligned in the third direction.
[0031] An area surrounding each of the one openings 200, 300 in the one ends and an area
surrounding each of the one openings 201, 301 in the other ends in the second direction
of the heat transfer portions 20, 30 are recessed on the first surfaces Sa1, Sb1 side.
Accordingly, an area surrounding each of the one openings 200, 300 in the one ends
and an area surrounding each of the one openings 201, 301 in the other ends in the
second direction of the heat transfer portions 20, 30 are projected on the second
surfaces Sa2, Sb2 side.
[0032] The projected amounts on the second surfaces Sa2, Sb2 sides of the area surrounding
each of the one openings 200, 300 and the area surrounding each of the one openings
201, 301 in the other ends in the one ends in the second direction of the heat transfer
portions 20, 30 are set so that these areas can respectively contact the corresponding
areas respectively surrounding the openings 200, 201, 300, 301 (i.e., the one openings
200, 300 in the one ends and the one openings 201, 301 in the other ends) of the heat
transfer portions 20, 30 of each two adjacent heat transfer plates 2, 3 aligned with
each other in the first direction.
[0033] In contrast, an area surrounding each of the other openings 203, 303 in the one ends
and an area surrounding each of the other openings 202, 302 in the other ends in the
second direction of the heat transfer portions 20, 30 are recessed on the second surfaces
Sa2, Sb2 side. Accordingly, an area surrounding each of the other openings 203, 303
in the one ends and an area surrounding each of the other openings 202, 302 in the
other ends in the second direction of the heat transfer portions 20, 30 are projected
on the first surfaces Sa1, Sb1 side.
[0034] The projected amounts on the first surfaces Sa1, Sb1 sides of the area surrounding
each of the other openings 203, 303 in the one ends and the area surrounding each
of the other openings 202, 302 in the other ends in the second direction of the heat
transfer portions 20, 30 are set so that these areas can respectively contact the
corresponding areas respectively surrounding the openings 202, 203, 302, 303 (i.e.,
the other openings 202, 302 in the one ends and the other openings 203, 303 in the
other ends) of the heat transfer portions 20, 30 of each two adjacent heat transfer
plates 2, 3 aligned with each other in the first direction. In Fig. 3 to Fig. 6, recessed
areas out of the areas each surrounding the openings 200, 201, 202, 203, 300, 301,
302, 303, and bottom parts of valleys 22, 32, which will be described later, are shown
in stippling to allow the relationship between the projected portions and the recessed
portions of the first surfaces Sa1, Sb1 and the second surfaces Sa2, Sb2 to be distinguishable.
[0035] In this embodiment, the one openings 200, 300 in the one ends and the one openings
201, 301 in the other ends in the second direction of the heat transfer portions 20,
30 are located diagonal to each other, due to the configuration in which the heat
transfer plates 2, 3 are stacked on each other. The other openings 203, 303 in the
one ends and the other openings 202, 302 in the other ends in the second direction
of the heat transfer portions 20, 30 are also located diagonal to each other.
[0036] The valleys 22, 32 and ridges 23, 33 are respectively formed on each of the first
surfaces Sa1, Sb1 and the second surfaces Sa2, Sb2 of the heat transfer portions 20,
30. Each of the first surfaces Sa1, Sb1 and the second surfaces Sa2, Sb2 of the heat
transfer portions 20, 30 has a plurality (a large number) of valleys 22, 32 and a
plurality (a large number) of ridges 23, 33.
[0037] More specifically, each of the heat transfer plates 2, 3 is formed by press molding
of a metal plate. Accordingly, the valleys 22, 32 formed on the first surfaces Sa1,
Sb1 of the heat transfer portions 20, 30 are in a front-back relationship with the
ridges 23, 33 formed on the second surfaces Sa2, Sb2 of the heat transfer portions
20, 30. The ridges 23, 33 formed on the first surfaces Sa1, Sb1 of the heat transfer
portions 20, 30 are in a front-back relationship with the valleys 22, 32 formed on
the second surfaces Sa2, Sb2 of the heat transfer portions 20, 30. That is, the deformation
of the metal plate by press molding allows the valleys 22, 32 formed on the first
surfaces Sa1, Sb1 of the heat transfer portions 20, 30 to be formed at positions corresponding
to the positions of the ridges 23, 33 formed on the second surfaces Sa2, Sb2 of the
heat transfer portions 20, 30. Also, the deformation of the metal plate by press molding
allows the ridges 23, 33 formed on the first surfaces Sa1, Sb1 of the heat transfer
portions 20, 30 to be formed at positions corresponding to the positions of the valleys
22, 32 formed on the second surfaces Sa2, Sb2 of the heat transfer portions 20, 30.
[0038] As shown in Fig. 3 and Fig. 5, the heat transfer portion 20, 30 includes, as the
valleys 22, 32 formed on the first surface Sa1, Sb1, a plurality of first valleys
220, 320 extending in the second direction and arranged at intervals from each other
in the third direction. The heat transfer portion 20, 30 includes, as the ridges 23,
33 formed on the first surface Sa1, Sb1, a plurality of first ridges 230, 330 each
extending in the second direction between each two first valleys 220, 230 adjacent
to each other in the third direction. That is, in the first surface Sa1, Sb1 of the
heat transfer portion 20, 30, the first valleys 220, 320 and the first ridges 230,
330 are alternately arranged in the third direction.
[0039] Further, the heat transfer portion 20, 30 includes, as the ridges 23, 33 formed on
the first surface Sa1, Sb1, at least one barrier ridge 231, 331 that is lower than
the first ridges 230, 330 formed on the first surface Sa1, Sb1, the at least one barrier
ridge 231, 331 extending in a direction intersecting with the plurality of first ridges
230, 330.
[0040] Each of the plurality of first valleys 220, 320 has the same or substantially the
same width in the third direction as each of the plurality of first ridges 230, 330.
The internal surfaces defining the first valleys 220, 320 are continuous with the
external surfaces defining the first ridges 230, 330. With this configuration, the
first surface Sa1, Sb1 of the heat transfer portion 20, 30 has a corrugated shape
with projections and recesses aligned in the first direction.
[0041] Based on this, the boundary between a specific first valley 220, 320 out of the plurality
of first valleys 220, 320 and a specific first ridge 230, 330 out of the plurality
of first ridges 230, 330 that is adjacent to the specific first valley 220, 320 is
located on the vertical centerline CL of the first surface Sa1, Sb1 of the heat transfer
portion 20, 30.
[0042] That is, the specific first valley 220, 320 or the specific first ridge 230, 330
is arranged while being displaced in the third direction from the vertical centerline
CL by one-fourth of the distance between adjacent first ridges 230, 330 with one first
valley 220, 320 interposed therebetween, or the distance between each two adjacent
first valleys 220, 320 with one first ridge 230, 330 interposed therebetween.
[0043] In this embodiment, the first surface Sa1,Sb1 of the heat transfer portion 20, 30
has a plurality of barrier ridges 231, 331. The plurality of barrier ridges 231, 331
are arranged at intervals from each other in the second direction. Each of the plurality
of barrier ridges 231, 331 is lower than the first ridges 230, 330 as aforementioned.
Specifically, the projected amount of the barrier ridges 231, 331 from a virtual plane
(the virtual plane extending in the second direction and the third direction) passing
through top ends of a plurality of second ridges 233, 333, which will be described
later, formed on the second surface Sa2, Sb2 is smaller than that of the first ridges
230, 330. Accordingly, the top ends of the barrier ridges 231, 331 are located closer
in the first direction to the second surface Sa2, Sb2 than the top ends of the first
ridges 230, 330. That is, the top ends of the barrier ridges 231, 331 are located
between the top ends of the first ridges 230, 330 and the bottom ends of the first
valleys 220, 320.
[0044] As will be later described in details, in the state where the plurality of heat transfer
plates 2, 3 are stacked on each other in this embodiment, each of the first ridges
230, 330 of one heat transfer plate 2, 3 of each two adjacent heat transfer plates
2, 3 is located between each two adjacent first ridges 230, 330 (i.e., located at
positions corresponding to the first valleys 220, 320) of the other heat transfer
plate 2, 3 of the each two adjacent heat transfer plates 2, 3.
[0045] Accordingly, the distance in the first direction between the top ends of the first
ridges 230, 330 and the top ends of the barrier ridges 231, 331 is set so that the
clearance between the first ridges 230, 330 of one heat transfer plate 2, 3 out of
each two adjacent heat transfer plates 2, 3 and the first valleys 220, 320 of the
other heat transfer plate 2, 3 can secure circulation of the first fluid medium A.
[0046] Specifically, in each of the heat transfer plates 2, 3 in this embodiment, the plurality
of first valleys 220, 320 are set to have the same width and the plurality of first
ridges 230, 330 are set to have the same width. In each of the heat transfer plates
2, 3, the first valleys 220, 320 and the first ridges 230, 330 are set to have substantially
the same width.
[0047] Accordingly, if the first ridges 230, 330 of one heat transfer plate 2, 3 out of
each two adjacent heat transfer plates 2, 3 are located too close to the first valleys
220, 320 of the other heat transfer plate 2, 3 out of the each two adjacent heat transfer
plate 2, 3, the clearances between both sides in the width direction of the first
ridges 230, 330 and both sides in the width direction of the first valleys 220, 320
will disappear, or become extremely narrow as compared with the clearances between
the top ends of the first ridges 230, 330 and the bottom ends of the first valleys
220, 320.
[0048] Thus, in this embodiment, the distance in the first direction between the top ends
of the first ridges 230, 330 and the top ends of the barrier ridges 231, 331 is set
so that the clearances between the both sides in the width direction of each of the
first ridges 230, 330 and the both sides in the width direction of each of the first
valleys 220, 320 have a distance to secure circulation of the first fluid medium A.
[0049] In this embodiment, the barrier ridges 231, 331 intersect with the plurality of
first ridges 230, 330 and the plurality of first valleys 220, 320. In this embodiment,
the barrier ridges 231, 331 extend in the third direction. The barrier ridges 231,
331 are set to have a length shorter than the entire length in the third direction
of the heat transfer portion 20, 30. That is, the length is set so that each of the
barrier ridges 231, 331 intersects with the first ridges 230, 330 and the first valleys
220, 320, the number of which is smaller than the total number of the plurality of
first ridges 230, 330 and the plurality of first valleys 220, 320 aligned with each
other over the entire length in the third direction of the heat transfer portion 20,
30.
[0050] More specifically, the length in the extending direction (longitudinal direction)
of the barrier ridge 231, 331 is set to 1/2 or less of the entire length in the third
direction of the heat transfer portion 20, 30. In this embodiment, the length in the
extending direction (longitudinal direction) of the barrier ridge 231, 331 is set
to 1/3 or less of the entire length in the third direction of the heat transfer portion
20, 30.
[0051] Since the length in the extending direction (longitudinal direction) of each of the
barrier ridges 231, 331 is set to 1/3 or less of the entire length in the third direction
of the heat transfer portion 20, 30, as described above, a plurality of rows each
constituted by the plurality of barrier ridges 231, 331 aligned at intervals from
each other in the second direction are provided at intervals from each other in the
third direction on the first surface Sa1, Sb1 of the heat transfer portion 20, 30.
That is, the plurality of barrier ridges 231, 331 are arranged in a matrix form on
the first surface Sa1, Sb1 of the heat transfer portion 20, 30.
[0052] The number and positions of the barrier ridges 231, 331 in each of the rows correspond
to each other. Thus, those barrier ridges 231, 331 corresponding to each other between
the different rows are aligned with each other in the third direction.
[0053] Here, the distance between each two adjacent rows of the barrier ridges 231, 331
(i.e., the distance between the barrier ridges 231, 331 adjacent to each other in
the third direction) is set to be equal to or less than the length in the extending
direction (longitudinal direction) of each of the barrier ridges 231, 331. In this
embodiment, the distance between each two adjacent rows of the barrier ridges 231,
331 (i.e., the distance between the barrier ridges 231, 331 adjacent to each other
in the third direction) is set to be shorter than the length in the extending direction
(longitudinal direction) of each of the barrier ridges 231, 331.
[0054] Since the length in the extending direction (longitudinal direction) of each of the
barrier ridges 231, 331 is set to 1/3 or less (1/2 or less in this embodiment) of
the entire length in the third direction of the heat transfer portion 20, 30, as described
above, some of the first valleys 220, 320 and the first ridges 230, 330 on the first
surface Sa1, Sa2 of the heat transfer portion 20, 30 are continuous in the second
direction while the remaining ones are divided at a plurality of places in the second
direction by the barrier ridges 231, 331. At least one end of each of the divided
first valleys 220, 320 and at least one end of each of the divided first ridges 230,
330 are joined to a corresponding one of the barrier ridges 231, 331.
[0055] In this embodiment, the divided first valleys 220, 320 are aligned with each other
in the second direction. Accordingly, the divided first ridges 230, 330 are also aligned
with each other in the second direction.
[0056] As shown in Fig. 4 and Fig. 6, the heat transfer portion 20, 30 includes, as the
valleys 22, 32 formed on the second surface Sa2, Sb2, a plurality of second valleys
221, 321 extending in the second direction and arranged at intervals from each other
in the third direction. The heat transfer portion 20, 30 includes, as the ridges 23,
33 formed on the second surface Sa2, Sb2, a plurality of second ridges 233, 333 each
extending in the second direction between each two second valleys 221, 231 adjacent
to each other in the third direction. That is, in the second surface Sa2, Sb2 of the
heat transfer portion 20, 30, the second valleys 221, 321 and the second ridges 233,
333 are alternately arranged in the third direction.
[0057] Further, the heat transfer portion 20, 30 includes, as the valleys 22, 32 formed
on the second surface Sa2, Sb2, valleys (hereinafter referred to as back side valleys)
222, 322 formed respectively on the back sides of the barrier ridges 231, 331 on the
first surface Sa1, Sb1.
[0058] The second valleys 221, 321 are the valleys 22, 32 formed on the back sides of the
first ridges 230, 330 on the first surface Sa1, Sb1. Thus, the second valleys 221,
321 extend in the second direction. The second ridges 233, 333 are the ridges 23,
33 formed on the back sides of the first valleys 220 and 320 on the first surface
Sa1, Sb1. Thus, the second ridges 233, 333 extend in the second direction.
[0059] The internal surfaces defining the second valleys 221, 321 are continuous with the
external surfaces defining the second ridges 233, 333. With this configuration, the
second surface Sa2, Sb2 of the heat transfer portion 20, 30 has a corrugated shape
with projections and recesses in the third direction.
[0060] The back side valleys 222, 322 are formed in the same pattern as the barrier ridges
231, 331 except that they have a reversed concavo-convex relationship.
[0061] In this embodiment, the back side valleys 222, 322 intersect with the plurality of
second ridges 233, 333 and the plurality of second valleys 221, 321. In this embodiment,
the back side valleys 222, 322 are set to have a length shorter than the entire length
in the third direction of the heat transfer portion 20, 30. That is, the length is
set so that each of the back side valleys 222, 322 intersects with the second ridges
233, 333 and the second valleys 221, 321, the number of which is smaller than the
total number of the plurality of second ridges 233, 333 and the plurality of second
valleys 221, 321 aligned with each other over the entire length in the third direction
of the heat transfer portion 20, 30.
[0062] More specifically, the length in the extending direction (longitudinal direction)
of the back side valley 222, 322 is set to 1/2 or less of the entire length in the
third direction of the heat transfer portion 20, 30. In this embodiment, the length
in the extending direction (longitudinal direction) of the back side valley 222, 322
is set to 1/3 or less of the entire length in the third direction of the heat transfer
portion 20, 30.
[0063] Since the length in the extending direction (longitudinal direction) of each of the
back side valleys 222, 322 is set to 1/3 or less of the entire length in the third
direction of the heat transfer portion 20, 30, as described above, a plurality of
rows each constituted by the plurality of back side valleys 222, 322 aligned at intervals
from each other in the second direction are provided at intervals from each other
in the third direction on the second surface Sa2, Sb2 of the heat transfer portion
20, 30. That is, the plurality of back side valleys 222, 322 are arranged in a matrix
form on the second surface Sa2, Sb2 of the heat transfer portion 20, 30.
[0064] The number and positions of the back side valleys 222, 322 in each of the rows correspond
to each other. Thus, those back side valleys 222, 322 corresponding to each other
between the different rows are aligned with each other in the third direction.
[0065] Here, the distance between each two adjacent rows of the back side valleys 222,
322 (i.e., the distance between the back side valleys 222, 322 adjacent to each other
in the third direction) is set to be equal to or less than the length in the extending
direction (longitudinal direction) of each of the back side valleys 222, 322. In this
embodiment, the distance between each two adjacent rows of the back side valleys 222,
322 (i.e., the distance between the back side valleys 222, 322 adjacent to each other
in the third direction) is set to be shorter than the length in the extending direction
(longitudinal direction) of each of the back side valleys 222, 322.
[0066] Since the length in the extending direction (longitudinal direction) of each of the
back side valleys 222, 322 is set to 1/3 or less (1/2 or less in this embodiment)
of the entire length in the third direction of the heat transfer portion 20, 30, as
described above, some of the second valleys 221, 321 and the second ridges 233, 333
on the second surface Sa2, Sa2 of the heat transfer portion 20, 30 are continuous
in the second direction while the remaining ones are divided at a plurality of places
in the second direction by the back side valleys 222, 322. At least one end of each
of the divided second valleys 221, 321 and at least one end of each of the divided
second ridges 233, 333 are joined to a corresponding one of the back side valleys
222, 322. That is, the divided second valleys 221, 321 are open to the inside of the
back side valleys 222, 322.
[0067] In this embodiment, the divided second valleys 221, 321 are aligned with each other
in the second direction. Accordingly, the divided second ridges 233, 333 are also
aligned with each other in the second direction.
[0068] The common features of the two kinds of heat transfer plates 2, 3 have been described
as above. Next, the different features between the two kinds of heat transfer plates
2, 3 will be described.
[0069] As shown in Fig. 3 and Fig. 5, the first ridges 230 on the first surface Sa1 of
one heat transfer plate (hereinafter referred to as first heat transfer plate) 2 out
of the two kinds of heat transfer plates 2, 3 are arranged while being positionally
displaced in the third direction from the first ridges 330 on the first surface Sb1
of the other heat transfer plate (hereinafter referred to as second heat transfer
plate) 3 out of the two kinds of heat transfer plates 2, 3. That is, in the state
where the first surface Sa1 of the heat transfer portion 20 of the first heat transfer
plate 2 is opposed to the first surface Sb1 of the heat transfer portion 30 of the
second heat transfer plate 3, the first valleys 220, 320 and the first ridges 230,
330 are respectively arranged so that the first ridges 230 of the first heat transfer
plate 2 are opposed to the first valleys 320 of the second heat transfer plate 3 and
that the first ridges 330 of the second heat transfer plate 3 are opposed to the first
valleys 220 of the first heat transfer plate 2.
[0070] In this embodiment, the first heat transfer plate 2 and the second heat transfer
plate 3 are different from each other in the number and arrangement pattern of the
barrier ridges 231, 331 on the first surfaces Sa1, Sb1. That is, the first heat transfer
plate 2 and the second heat transfer plate 3 are different from each other in the
number of rows of the barrier ridges 231, 331 on the first surfaces Sa1, Sb1 and the
arrangement pattern of the barrier ridges 231, 331 in each of the rows.
[0071] Specifically, the number of rows of the barrier ridges 331 arranged at intervals
from each other in the third direction on the first surface Sb1 of the heat transfer
plate 3 is smaller by one than the number of rows of the barrier ridges 231 arranged
at intervals from each other in the third direction on the first surface Sa1 of the
heat transfer plate 2. Further, the number of barrier ridges 231 in each of the rows
on the first surface Sb1 of the second heat transfer plate 3 is smaller by one than
the number of barrier ridges 231 in each of the rows on the first surface Sa1 of the
first heat transfer plate 2.
[0072] Accordingly, the position of each of the rows of the barrier ridges 231 on the first
surface Sa1 of the first heat transfer plate 2 corresponds to the position between
each two adjacent rows of the barrier ridges 331 on the first surface Sb1 of the second
heat transfer plate 3, and the position of each of the barrier ridges 331 on the first
surface Sb1 of the second heat transfer plate 3 corresponds to the position between
each two adjacent rows of the barrier ridges 231 on the first surface Sa1 of the first
heat transfer plate 2. The position of each of the barrier ridges 231 in each of the
rows on the first surface Sa1 of the first heat transfer plate 2 corresponds to the
position between each two adjacent barrier ridges 331 in each of the rows on the first
surface Sb1 of the second heat transfer plate 3 (i.e., the intermediate position between
each two adjacent barrier ridges 331 in the second direction), and the position of
each of the barrier ridges 331 in each of the rows on the first surface Sb1 of the
second heat transfer plate 3 corresponds to the position between each two adjacent
barrier ridges 231 in each of the rows on the first surface Sa1 of the first heat
transfer plate 2 (i.e., the intermediate position between each two adjacent barrier
ridges 231 in the second direction).
[0073] As shown in Fig. 3, each of the first heat transfer plates 2 includes the fitting
portion 21 projecting on the first surface Sa1 side of the heat transfer portion 20.
In contrast, as shown in Fig. 6, each of the second heat transfer plates 3 includes
the fitting portion 31 projecting on the second surface Sb2 side of the heat transfer
portion 30.
[0074] Each of the plurality of heat transfer plates 2, 3 (the first heat transfer plates
2 and the second heat transfer plates 3) has been described as above. The plurality
of heat transfer plates 2, 3 (the first heat transfer plates 2 and the second heat
transfer plates 3) are stacked on each other in the first direction, as shown in Fig.
2. In this embodiment, the first heat transfer plates 2 and the second heat transfer
plates 3 are alternately stacked on each other in the first direction. At this time,
each of the plurality of heat transfer plates 2, 3 has the first surface Sa1, Sb1
of its heat transfer portion 20, 30 opposed to the first surface Sa1, Sb1 of the heat
transfer portion 20, 30 of the adjacent heat transfer plate 2, 3 on one side in the
first direction. Further, each of the plurality of heat transfer plates 2, 3 has the
second surface Sa2, Sb2 of its heat transfer portion 20, 30 opposed to the second
surface Sa2, Sb2 of the heat transfer portion 20, 30 of the adjacent heat transfer
plate 2, 3 on the other side in the first direction.
[0075] With this configuration, as shown in Fig. 2 and Fig. 7, the first channels Ra through
which the first fluid medium A is circulated in the second direction and the second
flow channels Rb through which the second fluid medium B is circulated in the second
direction are alternately formed with the heat transfer portions 20, 30 of the heat
transfer plates 2, 3 respectively interposed therebetween. That is, each of the first
flow channels Ra through which the first fluid medium A is circulated is formed between
the first surfaces Sa1, Sb1 of the heat transfer portions 20, 30 of each two adjacent
heat transfer plates 2, 3, and each of the second flow channels Ra through which the
second fluid medium B is circulated is formed between the second surfaces Sa2, Sb2
of the heat transfer portions 20, 30 of each two adjacent heat transfer plates 2,
3.
[0076] In this state, the openings 200, 201, 202, 203, 300, 301, 302, 303 located in the
corresponding positions of the heat transfer portions 20, 30 are lined up in the first
direction, as shown in Fig. 2. The areas respectively surrounding the openings 200,
201, 202, 203, 300, 301, 302, 303 that are opposed to and projected toward each other
contact each other. This configuration forms the first inflow channel Pa1 for supplying
the first fluid medium A into the first flow channels Ra, the first outflow channel
Pa2 for causing the first fluid medium A to flow out of the first flow channels Ra,
the second inflow channel Pb 1 for supplying the second fluid medium B into the second
flow channels Rb, and the second outflow channel Pb2 for causing the second fluid
medium B to flow out of the second flow channels Rb.
[0077] More specifically, when the plurality of heat transfer plates 2, 3 are stacked on
each other, each of the first heat transfer plates 2 and each of the second heat transfer
plates 3 are stacked on each other to form a pair. When a plurality of pairs are stacked
on each other, every other pair is turned 180 degrees upside down about a virtual
line extending in the first direction. In this state, the fitting portion 21, 31 of
one heat transfer plate 2, 3 (the first heat transfer plate 2 or the second heat transfer
plate 3) out of the heat transfer plates 2, 3 adjacent to each other in the first
direction is fitted over the fitting portion 21, 31 of the other heat transfer plate
2, 3 (the first heat transfer plate 2 or the second heat transfer plate 3) out of
the heat transfer plates 2, 3 adjacent to each other in the first direction.
[0078] Thus, as shown in Fig. 8 to Fig. 11, on the first surfaces Sa1, Sb1 sides of each
two adjacent heat transfer plates 2, 3, the first ridges 230 of the first heat transfer
plate 2 (heat transfer portion 20) are opposed to the first valleys 320 of the second
heat transfer plate 3 (heat transfer portion 30), and the first valleys 220 of the
first heat transfer plate 2 (heat transfer portion 20) are opposed to the first ridges
330 of the second heat transfer plate 3 (heat transfer portion 30).
[0079] On the first heat transfer plate 2, the barrier ridges 231 are lower than the first
ridges 230, and on the second heat transfer plate 3, the barrier ridges 331 are lower
than the first ridges 330; thus, the barrier ridges 231 of the first heat transfer
plate 2 cross and abut against the first ridges 330 of the second heat transfer plate
3, and the barrier ridges 331 of the second heat transfer plate 3 cross and abut against
the first ridges 230 of the first heat transfer plate 2.
[0080] In contrast, on the second surfaces Sa2, Sb2 sides of each two adjacent heat transfer
plates 2, 3, the second ridges 233 of the first heat transfer plate 2 (heat transfer
portion 20) are opposed to the second ridges 333 of the second heat transfer plate
3 (heat transfer portion 30), and the second valleys 221 of the first heat transfer
plate 2 (heat transfer portion 20) are opposed to the second valleys 321 of the second
heat transfer plate 3 (heat transfer portion 30). That is, on the first surface Sa1,
Sb1 of the heat transfer portion 20, 30 of each of the first heat transfer plate 2
and the second heat transfer plate 3, the boundary between a specific first valley
220, 320 out of the plurality of first valleys 220, 320 and a specific first ridge
230, 330 out of the plurality of first ridges 230, 330 that is adjacent to the specific
first valley 220, 320 is located on the vertical centerline CL. Thus, turning the
first heat transfer plates 2 and the second heat transfer plates 3 180° upside down
as aforementioned causes the second ridges 233, 333 of each two adjacent heat transfer
plates 2, 3 to be opposed to each other and causes their top ends to be in contact
with each other.
[0081] With this configuration, as shown in Fig. 2, the first flow channel Ra through which
the first fluid medium A is circulated in the second direction orthogonal to the first
direction is formed between the first surfaces Sa1, Sb1 of the heat transfer portions
20, 30 of each two adjacent heat transfer plates 2, 3. The second flow channel Rb
through which the second fluid medium B is circulated in the second direction is formed
between the second surfaces Sa2, Sb2 of the heat transfer portions 20, 30 of each
two adjacent heat transfer plates 2, 3.
[0082] Further, as described above, the plurality of heat transfer plates 2, 3 are stacked
on each other in the first direction so that the openings 200, 201, 202, 203, 300,
301, 302, 303 located in the corresponding positions of the heat transfer portions
20, 30 are lined up in the first direction. The areas respectively surrounding the
openings 200, 201, 202, 203, 300, 301, 302, 303 that are opposed to and projected
toward each other contact each other. This configuration forms the first inflow channel
Pa1 for supplying the first fluid medium A into the first flow channels Ra, the first
outflow channel Pa2 for causing the first fluid medium A to flow out of the first
flow channels Ra, the second inflow channel Pb 1 for supplying the second fluid medium
B into the second flow channels Rb, and the second outflow channel Pb2 for causing
the second fluid medium B to flow out of the second flow channels Rb.
[0083] In the heat exchanger 1 according to this embodiment, the contacted portions between
each two adjacent heat transfer plates 2, 3 are brazed together. This configuration
allows the plurality of heat transfer plates 2, 3 to be integrally (mechanically)
connected to each other, and an interface between the opposed surfaces (contacted
portions) of the adjacent heat transfer plates 2, 3 to be sealed.
[0084] The heat exchanger 1 according to this embodiment has been described as above. As
shown in Fig. 2, Fig. 7, and Fig. 12, the first fluid medium A flows from the first
inflow channel Pa1 into the plurality of first flow channels Ra. The first fluid medium
A is circulated through each of the first flow channels Ra in the second direction,
and flows out to the first outflow channel Pa2. In contrast, as shown in Fig. 2, Fig.
7, and Fig. 13, the second fluid medium B flows from the second inflow channel Pb
1 into the plurality of second flow channels Rb. The second fluid medium B is circulated
through each of the plurality of second flow channels Rb in the second direction,
and flows out to the second outflow channel Pb2.
[0085] In this embodiment, as shown in Fig. 12, the first fluid medium A is circulated through
each of the first flow channels Ra with a diagonal line connecting opposing corners
of the heat transfer portion 20, 30 as a center of flow. As shown in Fig. 13, in contrast,
the second fluid medium B is circulated through each of the second flow channels Rb
with another diagonal line connecting opposing corners of the heat transfer portion
20, 30 as a center of flow, which is different from the diagonal line being the center
of the flow of the first fluid medium A.
[0086] At this time, the first fluid medium A that is circulated through the first flow
channels Ra and the second fluid medium B that is circulated through the second flow
channels Rb exchange heat via the heat transfer plates 2, 3 (the heat transfer portions
20, 30) that separate the first flow channels Ra and the second flow channels Rb.
As a result, the second fluid medium B is condensed or evaporated in the course of
being circulated through the second flow channels Rb in the second direction.
[0087] As described above, a plate heat exchanger 1 according to this embodiment includes
a plurality of heat transfer plates 2, 3 each including a heat transfer portion 20,
30 having a first surface Sa1, Sb1 on which ridges 23, 33 and valleys 22, 32 are formed,
and a second surface Sa2, Sb2 that is opposed to the first surface Sa1, Sb1 and on
which valleys 22, 32 being in a front-back relationship with the ridges 23, 33 of
the first surface Sa1, Sb1 and ridges 23, 33 being in a front-back relationship with
the valleys 22, 32 of the first surface Sa1, Sb1 are formed, the plurality of heat
transfer plates 2, 3 respectively having the heat transfer portions 20, 30 stacked
on each other in a first direction, wherein the first surface Sa1, Sb1 of the heat
transfer portion 20, 30 of each of the plurality of heat transfer plates 2, 3 is arranged
opposed to the first surface Sa1, Sb1 of the heat transfer portion 20, 30 of one of
the plurality of heat transfer plates 2, 3 adjacent to the each heat transfer plate
2, 3 on one side in the first direction, and the second surface Sa2, Sb2 of the heat
transfer portion 20, 30 of each of the plurality of heat transfer plates 2, 3 is arranged
opposed to the second surface Sa2, Sb2 of the heat transfer portion 20, 30 of one
of the plurality of heat transfer plates 2, 3 adjacent to the each heat transfer plate
2, 3 on an other side in the first direction, wherein a first flow channel Ra through
which a first fluid medium A is circulated in a second direction orthogonal to the
first direction is formed between the first surfaces Sa1, Sb1 of the heat transfer
portions 20, 30 of each adjacent two of the plurality of heat transfer plates 2, 3,
and a second flow channel Rb through which a second fluid medium B is circulated in
the second direction is formed between the second surfaces Sa2, Sb2 of the heat transfer
portions 20, 30 of each adjacent two of the plurality of heat transfer plates 2, 3,
wherein each of the heat transfer portions 20, 30 of each adjacent two of the plurality
of heat transfer plates 2, 3 includes: as the ridges 23, 33 formed on the first surface
Sa1, Sb1, a plurality of first ridges 230, 330 arranged at intervals from each other
in a direction intersecting with the first direction and the second direction, the
plurality of first ridges 230, 330 extending in the second direction or in a synthetic
direction that has a component in the second direction, and at least one barrier ridge
231, 331 that is lower than the plurality of first ridges 230, 330 formed on the first
surface Sa1, Sb1, the at least one barrier ridge 231, 331 extending in a direction
intersecting with the plurality of first ridges 230, 330; as the valleys 22, 32 formed
on the first surface Sa2, Sb2, a plurality of first valleys 220, 320 each formed between
each adjacent two of the plurality of first ridges 230, 330 in the direction intersecting
with the first direction and the second direction; and, as the valleys 22, 32 formed
on the second surface Sa2, Sb2, a plurality of second valleys 221, 321 being in a
front-back relationship with the plurality of first ridges 230, 330, wherein each
of the plurality of first ridges 230, 330 of one of each adjacent two of the plurality
of heat transfer plates 2, 3 is located between each adjacent two of the plurality
of first ridges 230, 330 of the opposed heat transfer plate 2, 3, wherein the at least
one barrier ridge 231, 331 on each of each adjacent two of the plurality of heat transfer
plates 2, 3 has a longitudinal dimension set to be shorter than the entire length
in a third direction of the heat transfer portion 20, 30, the third direction being
orthogonal to the first direction and the second direction, and wherein the at least
one barrier ridge 231, 331 on one of each adjacent two of the plurality of heat transfer
plates 2, 3 is arranged at a position displaced in at least one of the second direction
and the third direction from the at least one barrier ridge 231, 331 on the opposed
heat transfer plate 2, 3, and crosses and abuts against the plurality of first ridges
230, 330 of the opposed heat transfer plate 2, 3.
[0088] According to the heat exchanger 1 configured as above, the longitudinal dimension
of each of the at least one barrier ridge 231, 331 on each of each adjacent two of
the plurality of heat transfer plates 2, 3 is set to be shorter than the entire length
in the third direction of the heat transfer portion 20, 30, and each of the at least
one barrier ridges 231, 331 on one of each adjacent two of the plurality of heat transfer
plates 2, 3 is arranged at a position displaced in at least one of the second direction
and the third direction from each of the at least one barrier ridge 23, 331 on the
opposed heat transfer plate 2, 3. Thus, each of the at least one barrier ridge 231,
331 on one of each adjacent two of the plurality of heat transfer plates 2, 3 does
not coincide with (is not overlapped with) each of the at least one barrier ridge
231, 331 on the opposed heat transfer plate 2, 3. As a result, the first flow channel
Ra is formed while communicating in the second direction.
[0089] As shown in Fig. 9 to Fig. 11, each of the at least one barrier ridge 231, 331 is
projected toward the opposed heat transfer portion 20, 30 at an intermediate position
of the first flow channel Ra formed between the first surfaces Sa1, Sb1 of each two
adjacent heat transfer portions 20, 30. This configuration allows each of the at least
one barrier ridge 231, 331 to block circulation of the first fluid medium A through
the first flow channel Ra to thereby increase the circulating resistance of the first
fluid medium A through the first flow channel Ra.
[0090] In particular, according to the heat exchanger 1 of this embodiment, each of the
first ridges 230, 330 of each two adjacent heat transfer plates 2, 3 is located between
each two adjacent first ridges 230, 330 of the opposed heat transfer plate 2,3, and
each of the at least one barrier ridge 231, 331 (each of the at least one barrier
ridge 231, 331 lower than the first ridges 230, 330) of the heat transfer plate 2,
3 crosses and abuts against the first ridges 230, 330 of the opposed heat transfer
plate 2, 3.
[0091] This configuration makes small a clearance between the first surfaces Sa1, Sb1 of
each two adjacent heat transfer plates 2, 3. That is, the projected amount of each
of the at least one barrier ridge 231, 331 is smaller than the projected amount of
the first ridges 230, 330, and consequently the heat transfer plates 2, 3 defining
each of the first flow channels Ra are arranged close to each other. This configuration
narrows the width of the first flow channel Ra to thereby increase the circulating
resistance of the first fluid medium A through the first flow channel Ra.
[0092] Thus, in the heat exchanger 1 according to this embodiment, the circulating resistance
of the first fluid medium A is increased by each of the at least one barrier ridge
231, 331 and the narrowed width of the first flow channel Ra; consequently, the first
fluid medium A becomes more likely to cause the heat transfer portions 20, 30 to be
subjected to thermal influences, thereby improving the performance of transferring
heat to the second fluid medium B.
[0093] In contrast, on the second surfaces Sa2, Sb2 of the respective heat transfer plates
2, 3, the plurality of second valleys 221, 321 being in a front-back relationship
with the first ridges 230, 330 are formed, and the valleys being in a front-back relationship
with the barrier ridges 231, 331 of the first surfaces Sa1, Sb1 are formed; thus,
nothing causes an increase in the circulating resistance of the second fluid medium
B in the second flow channel Rb formed between the second surfaces Sa2, Sb2 of each
two adjacent heat transfer plates 2, 3. Consequently, the circulating resistance of
the second fluid medium B through the second flow channel Rb can be reduced to increase
the velocity of the second fluid medium B.
[0094] As a result, liquid film of the second fluid medium B formed on the surfaces of the
heat transfer portions 20, 30 is disturbed by the increased velocity of the second
fluid medium B, even if a fluid medium that causes phase change (a fluid medium having
two-phase flow that contains liquid and gas) is employed as the second fluid medium
B.
[0095] Consequently, the heat exchanger 1 configured as above enhances heat transfer performance
of the second fluid medium B circulated through the second flow channels Rb to the
heat transfer portions 20, 30 (the first fluid medium A side).
[0096] In this embodiment, each of the heat transfer portions 20, 30 of each adjacent two
of the plurality of heat transfer plates 2, 3 includes a plurality of barrier ridges
231, 331, and the plurality of barrier ridges 231, 331 are aligned at intervals from
each other in the second direction. This configuration can increase the circulation
resistance at a plurality of places (i.e., the places at which the plurality of barrier
ridges 231, 331 are located) within the first flow channel Ra. As a result, the first
fluid medium A becomes more likely to cause the heat transfer portions 20, 30 to be
subjected to thermal influences, thereby improving the performance of transferring
heat to the second fluid medium B.
[0097] In particular, in this embodiment, the heat transfer portion 20 of one heat transfer
plate 2 out of each adjacent two of the plurality of heat transfer plates 2, 3 has
at least one row (two rows in this embodiment) constituted by a plurality of barrier
ridges 231 arranged at intervals from each other in the second direction, the heat
transfer portion 30 of the other heat transfer plate 3 out of the each adjacent two
of the plurality of heat transfer plates 2, 3 has at least two rows (three rows in
this embodiment) each constituted by a plurality of barrier ridges 331 arranged at
intervals from each other in the second direction, and each of the at least one row
on the one heat transfer plate 2 out of the each adjacent two of the plurality of
heat transfer plates 2, 3 is positioned between each adjacent two of the at least
two rows on the other heat transfer plate 3 out of the each adjacent two of the plurality
of heat transfer plates 2, 3. This configuration causes the first fluid medium A to
be diffused within the entire first flow channel Ra. Accordingly, the areas contributing
to heat transfer in the heat transfer portions 20, 30 are increased, which consequently
improves heat transfer performance of the first fluid medium A within the first flow
channel Ra.
[0098] In particular, since each of the plurality of barrier ridges 231 constituting the
at least one row on the one heat transfer plate 2 out of the each adjacent two of
the plurality of heat transfer plates 2, 3 is positioned between each adjacent two
of the plurality of barrier ridges 331 constituting each of the at least two rows
on the other heat transfer plate 3 out of the each adjacent two of the plurality of
heat transfer plates 2, 3, the first fluid medium A circulating through the first
flow channel Ra is diffused around each of the plurality of barrier ridges 231, 331
as it flows downstream. This configuration causes the first fluid medium A to be diffused
within the entire first flow channel Ra, and accordingly, the areas contributing to
heat transfer in the heat transfer portions 20, 30 are increased. This consequently
improves heat transfer performance of the first fluid medium A within the first flow
channel Ra.
[0099] Each of the at least one barrier ridge 231, 331 extends straight in the third direction,
and thus extends in a direction orthogonal to a direction in which the first fluid
medium A is circulated within the first flow channel Ra. With this configuration,
the first fluid medium A becomes more likely to collide with each of the at least
one barrier ridge 231, 331, which not only increases the circulating resistance but
causes the first flow medium A to be efficiently diffused in the third direction.
[0100] In this embodiment, each of the heat transfer portions 20, 30 of each adjacent two
of the plurality of heat transfer plates 2, 3 includes, as the ridges 23, 33 formed
on the second surface Sa2, Sb2, a plurality of second ridges 233, 333 being in a front-back
relationship with the plurality of first valleys 220, 320, and the plurality of second
ridges 233, 333 of one of each adjacent two of the plurality of heat transfer plates
2, 3 are overlapped with the plurality of second ridges 233, 333 of the opposed heat
transfer plate 2, 3 and are in contact with top ends of the plurality of second ridges
233, 333 of the opposed heat transfer plate 2, 3. This configuration prevents the
heat transfer portions 20, 30 from being expanded even if the fluid pressure of the
first fluid medium A circulated through the first flow channel Ra acts on the heat
transfer portions 20, 30. Therefore, the space constituting the second flow channel
Rb is secured to ensure smooth circulation of the second fluid medium B.
[0101] It is a matter of course that the present invention is not limited to any of the
aforementioned embodiments, but various modifications can be made without departing
from the gist of the present invention.
[0102] The aforementioned embodiment was described by taking, for example, the case where
the top ends of the second ridges 233, 333 of each two adjacent heat transfer plates
2, 3 (the first heat transfer plate 2 and the second heat transfer plate 3) are in
contact with or connected to each other, without limitation thereto. For example,
the top ends of the second ridges 233, 333 of the each two adjacent heat transfer
plates 2, 3 (the first heat transfer plate 2 and the second heat transfer plate 3)
may be away from each other in the first direction or in the second direction. However,
in order to achieve rigidity for withstanding, for example, an increase in the flow
pressure within the first flow channel Ra, it is preferable that the top ends of the
second ridges 233, 333 of each two adjacent heat transfer plates 2, 3 (the first heat
transfer plate 2 and the second heat transfer plate 3) be in contact with or connected
to each other, as in the cases of the aforementioned embodiments.
[0103] The aforementioned embodiment was described by taking, for example, the case where
the first valleys 220, 320, the first ridges 230, 330, the second valleys 221, 321,
and the second ridges 233, 333 extend straightforwardly in the second direction, without
limitation thereto. For example, the second valleys 221, 321 may extend in a synthetic
direction that has a component in the second direction (i.e., in a direction inclined
relative to a virtual line extending in the second direction), with the prerequisite
that they are continuous with the back side valleys 222, 322. However, in order to
increase the velocity of the second fluid medium B, the back side valleys 222, 322
are required to be inclined, satisfying the condition that the inclination component
(angle) relative to the virtual line extending in the second direction is smaller
than the inclination component (angle) relative to the virtual line extending in the
third direction.
[0104] The aforementioned embodiment was described by taking, for example, the case where
each of the plurality of heat transfer plates 2, 3 has two or more barrier ridges
231, 331 at intervals from each other in the second direction, without limitation
thereto. For example, one barrier ridge 231, 331 may be provided on one heat transfer
portion 20, 30. The aforementioned second embodiment was described by taking, for
example, the case where two or more rows each constituted by the plurality of barrier
ridges 231, 331 arranged at intervals from each other in the second direction are
provided at intervals from each other in the third direction, without limitation thereto.
For example, the plurality of barrier ridges 231, 331 arranged at intervals from each
other in the second direction to be aligned in one row may be provided on each of
the first surfaces Sa1, Sb1 of the heat transfer portions 20, 30. Further, the aforementioned
second embodiment was described by taking, for example, the case where the plurality
of barrier ridges 231, 331 arranged at intervals from each other in the second direction
are lined up in the second direction on each of the first surfaces Sa1, Sb1 of the
heat transfer portions 20, 30, without limitation thereto. For example, the plurality
of barrier ridges 231, 331 arranged at intervals from each other in the second direction
may be arranged while being displaced from each other in the third direction.
[0105] The aforementioned embodiment was described by taking, for example, the case where
the plurality of barrier ridges 231, 331 formed on the first surfaces Sa1, Sb1 of
the heat transfer portions 20, 30 are formed into the same shape, without limitation
thereto. For example, the plurality of barrier ridges 231, 331 in different shapes
may be formed on the first surfaces Sa1, Sb1 of the heat transfer portions 20, 30.
[0106] The aforementioned embodiment was described by taking, for example, the case where
the first valleys 220, 320 and the first ridges 230, 330 are set to have the same
width dimension (i.e., the dimension in the direction orthogonal to the longitudinal
direction), without limitation thereto. For example, as shown in Fig. 14 to Fig. 16,
the width dimension of the first valleys 220, 320 may be set to be larger than the
width dimension of the first ridges 230, 330. Specifically, as shown in Fig. 14, the
radius of curvature of the first valleys 220, 320 may be set to be larger than the
radius of curvature of the first ridges 230, 330, with the prerequisite that the first
valleys 220, 320 and the first ridges 230, 330 have an arc-shaped cross section. Further,
as shown in Fig. 15 and Fig. 16, the first valleys 220, 320 may be formed to have
a flat bottom and have a width dimension larger than the width dimension of the first
ridges 230, 330. In this case, the first ridges 230, 330 may have an arc-shaped cross
section as shown in Fig. 15, or may have a flat top end as shown in Fig. 16. This
configuration allows the barrier ridges 231, 331 lower than the first ridges 230,
330 to cross and abut against the first ridges 230, 330 of the opposed heat transfer
plate 2, 3. Thus, even if the first ridges 230, 330 are arranged to be close to or
fit into the first valleys 220, 320, no extremely narrow clearance is formed between
the first valleys 220, 320 and the first ridges 230, 330, thereby securing circulation
of the fist fluid medium A.
[0107] The aforementioned embodiment was described by taking, for example, the case where
the first flow channels Ra are directly communicated with the first inflow channel
Pa1 and the first outflow channel Pa2 and the second flow channels Rb are directly
communicated with the second inflow channel Pb1 and the second outflow channel Pb2,
without limitation thereto. For example, as shown in Fig. 17 and Fig. 18, at least
two second flow channels Rb may be communicated with each other by a connection flow
channel PJ that extends in the first direction at a position different from the second
inflow channel Pb 1 and the second outflow channel Pb2 so that the second flow channel
Rb located most upstream of the circulation route including the connection flow channel
PJ of the second fluid medium B is connected to the second inflow channel Pb1 and
the second flow channel Rb located most downstream of the circulation route including
the connection flow channel PJ of the second fluid medium B is connected to the second
outflow channel Pb2.
[0108] More specifically, a branch reference space Ds1 is formed between two adjacent heat
transfer plates 2, 3 at an intermediate position in a direction in which the heat
transfer plates 2, 3 are stacked on each other (i.e., in the first direction). Based
on this, the configuration may be such that one of the second flow channels Rb located
on one side in the first direction of the branch reference space Ds1 is connected
to the branch reference space Ds1 via the connection flow channel PJ, and that one
of the second flow channels Rb located on the other side in the first direction of
the branch reference space Ds1 is connected to the branch reference space Ds1 via
the connection flow channel PJ. This configuration allows the circulation route of
the second fluid medium B to be branched into at least one first system S1 that is
continuous on the one side in the first direction of the branch reference space Ds1
and at least one second system S2 that is continuous on the other side in the first
direction of the branch reference space Ds1.
[0109] In the case where the circulation route of the second fluid medium B includes the
first system S1 and the second system S2, each of the first system S1 and the second
system S2 may have a branch reference space (branch reference space on the downstream
side) Ds2 formed between two adjacent heat transfer plates 2, 3 that define at least
one second flow channel Rb located at an intermediate position in the first direction
and directly or indirectly connected to the branch reference space Ds1 upstream thereof
via the connection flow channel PJ. In this case, the second flow channel Rb located
on one side in the first direction of the branch reference space Ds2 is connected
to the branch reference space Ds2 on the downstream side via the connection flow channel
PJ, and the second flow channel Rb located on the other side in the first direction
of the branch reference space Ds2 is connected to the branch reference space Ds2 on
the downstream side via the connection flow channel PJ. This configuration allows
the circulation route of the second fluid medium B in each of the first system S1
and the second system S2 to be further branched into at least two systems S1a, S1b,
S2a, S2b, and the second flow channel Rb located most downstream of each of the systems
S1a, S1b, S2a, S2b to be connected to the second outflow channel Pb2. Note that there
may be one or more second flow channels Rb located most downstream of each of the
systems S1a, S1b, S2a, S2b (the second flow channels Rb connected to the second outflow
channel Pb2).
[0110] The aforementioned embodiment was described by taking, for example, the case where
the plurality of barrier ridges 231, 331 extend straight in the third direction, without
limitation thereto. For example, the plurality of barrier ridges 231, 331 may include
the bent ridge portion 232, 332, similar to the first embodiment. In this case, the
barrier ridges 231, 331 of each two adjacent heat transfer plates 2, 3 may intersect
with each other when seen from the first direction.
[0111] The aforementioned embodiment was described by taking, for example, the case where
the barrier ridges 231, 331 are provided while intersecting with the plurality of
first ridges 230, 330, without limitation thereto. The barrier ridges 231, 331 may
extend in a direction intersecting with the first ridges 230, 330. That is, each of
the barrier ridges 231, 331 may be so short that it intersects only with a single
first ridge 230, 330, or lies between each two adjacent first ridges 230, 330 (i.e.,
within a single first valley 220, 320), with the prerequisite that the barrier ridges
231, 331 extend in a direction intersecting with the first ridges 230, 330 (i.e.,
the top ends (ridge lines) of the barrier ridges 231, 331 extend in a direction intersecting
with the first ridges 230, 330).
REFERENCE SIGNS LIST
[0112]
1: Plate heat exchanger (heat exchanger)
2: First heat transfer plate (heat transfer plate)
3: Second heat transfer plate (heat transfer plate)
20, 30: Heat transfer portion
21, 31: Fitting portion
22, 32: Valley
23, 33: Ridge
200, 201, 202, 203, 300, 301, 302, 303: Opening
220, 320: First valley
221, 321: Second valley
222, 322: Back side valley
230, 330: First ridge
231,331: Barrier ridge
233, 333: Second ridge
A: First fluid medium
B: Second fluid medium
CL: Vertical centerline
Pa1: First inflow channel
Pa2: First outflow channel
Pb1: Second inflow channel
Pb2: Second outflow channel
Ra: First flow channel
Rb: Second flow channel
Sa1, Sb1: First surface
Sa2, Sb2: Second surface