Technical Field
[0001] The present disclosure relates to heat pumps for cooling and/or heating purposes
having a refrigerant circuit. In particular, the disclosure relates to split-type
heat pumps comprising a heat source unit, such as an outdoor unit, and at least one
heat consumer unit, such as an indoor unit. Even more particular, the disclosure relates
to a heat pump using air as heat source.
Background
[0002] Particularly with respect to domestic appliances, heat source units are often configured
as so-called front blowers, wherein the heat source unit has a casing with walls defining
an interior space. The space is separated by a vertical partition into an air chamber
and machine chamber. A fan is provided in the air chamber for inducing an air flow
through the front of the casing and through a heat source heat exchanger. The machine
chamber contains a plurality of components of the refrigerant circuit including components
controlling the refrigerant flow through the refrigerant circuit.
[0003] Under some circumstances, it is desired to arrange the heat source unit in front
of a wall below a window. For this purpose, it is required that the heat source unit
does not exceed a certain height of for example 87 mm. Yet, when reducing the height
of the casing only, the available space in the machine chamber is reduced. Accordingly,
the components contained in the machine chamber need to be arranged more compact.
This in turn, however, leads to the problem that some of said components may not be
accessed for maintenance purposes without having to dismount others of said components.
Therefore, maintenance of the heat source unit is more cumbersome and requires more
time.
Summary
[0004] The present disclosure aims at providing a heat source unit enabling ease of maintenance
even when the casing is relatively low in height.
[0005] According to an aspect, a heat source unit for a heat pump having a refrigerant circuit
is suggested. The refrigerant circuit of a heat pump in its simplest configuration
comprises a heat source heat exchanger (outdoor heat exchanger), a heat consumer heat
exchanger (indoor heat exchanger), an expansion valve and a compressor connected by
refrigerant pipes. In addition, the refrigerant circuit may comprise a 4-way switching
valve for switching between heating operation and cooling/defrosting operation (reverse
cycle operation).
[0006] The heat source unit comprises a casing (outer casing) having walls defining an interior
space. The interior space is separated by a partition into an air chamber and a machine
chamber. The air chamber may accommodate a fan for inducing an air flow through the
air chamber and through the heat source heat exchanger. The heat source heat exchanger
may form one of the walls of the casing of the heat source unit, e.g. at a back of
the heat source unit, and delimit the interior space. The machine chamber accommodates
a plurality of components configured to control a refrigerant flow through the refrigerant
circuit. In this context, "a component configured to control a refrigerant flow through
the refrigerant circuit" is any component, be it electrical, electronical and/or mechanical,
that is used for the control of the refrigerant circuit including but not limited
to a control board or control box, a valve, a sensor, the compressor of the refrigerant
circuit, an inverter used for altering the capacity of the compressor and the like.
To put it differently, the component may be any electrical/electronical and/or mechanically
movable component that requires maintenance.
[0007] The casing may comprise a bottom plate and a top plate. The heat source unit may
be mounted to a horizontal surface or brackets fixed to a vertical wall with the bottom
plate being oriented horizontally. For this purpose, the feet may be provided at a
lower side of the bottom plate, the feet being configured for mounting on the horizontal
surface or the brackets. The top plate is arranged opposite to the bottom plate and
delimits the height of the heat source unit at an upper end. In one example, the casing
further has a front, an opposite back, and opposite sides respectively extending between
the front and the back. The walls of the casing comprise a maintenance plate, wherein
the maintenance plate has a first portion delimiting the interior space at a front
of the heat source unit in a position corresponding to the machine chamber and a second
portion delimiting the interior space at a side of the heat source unit corresponding
to the machine chamber. In one example, the maintenance plate is, in a top view of
the heat source unit, "L" shaped. Moreover, the maintenance plate is removable for
giving access to the components in the machine chamber to allow maintenance of the
components.
[0008] Additionally, the walls may comprise a bell mouth delimiting the interior space at
the front of the heat source unit in a position corresponding to the air chamber.
The bell mouth may be covered at its front side by a grille. Further, the walls may
comprise the heat source heat exchanger delimiting the interior space at a side of
the heat source unit and at the back of the heat source unit corresponding to the
air chamber. Thus, in one example, the heat source heat exchanger may, in a top view
of the heat source unit, be "L" shaped. An additional rear plate may be provided as
one of the walls, the rear plate having a first portion delimiting the interior space
at the back of the heat source unit in a position corresponding to the machine chamber
and a second portion delimiting the interior space at a side (the same side as the
second portion of the maintenance plate) of the heat source unit corresponding to
the machine chamber. Hence, in one example, the rear plate is, in a top view of the
heat source unit, "L" shaped.
[0009] According to this aspect the second portion of the maintenance plate, which is arranged
to delimit the interior space at the side of the heat source unit covers at least
half of that side in a direction of depth. The "depth" is the dimension of the heat
source unit between the front and a back. The first portion of the maintenance plate
may on the other hand delimit a major portion (more than 50%, according to an example
more than 75%) of the front of the machine chamber.
[0010] Whereas in prior art devices the maintenance plate primarily covered the front of
the machine chamber giving access only or at least primarily to the components which
are accessible from the front, the heat source unit of the above aspect suggests a
maintenance plate which also covers at least half of the side of the machine chamber,
thereby allowing access to the components from both the front and the side. Accordingly,
most of the components may still be accessed for maintenance, even though the components
are arranged more compact in the machine chamber without the need to first disassemble
some of the components to allow access. Thus, ease of maintenance is realized.
[0011] According to a second aspect, the components comprise a switchboard (also switchbox,
control board or control box) having a board and electrical and/or electronical components
mounted on a main surface of the board, wherein the main surface faces an inner side
of the first portion of the maintenance plate.
[0012] Thus, once the maintenance plate is removed, the switchboard is easily accessible
from the front and all of the electrical and/or electronical components mounted on
the main surface face the front, whereby they may easily be accessed. In addition,
the switchboard may remain fixed in the heat source unit during maintenance. This
is particularly advantageous if refrigerant piping of the refrigerant circuit of the
heat pump is attached to and in surface contact with the switchboard to provide for
a cooling effect of the electrical and/or electronical components. Disassembling the
refrigerant piping, which is fragile, bears the risk of damages and is cumbersome.
Thus, this aspect further enhances ease of maintenance.
[0013] According to a third aspect, the board is attached to a support extending perpendicularly
to the main surface of the board away from the first portion of the maintenance plate.
In other words, the support frame extends from the board towards the back of the heat
source unit and/or faces an inner side of the second portion of the maintenance plate.
The support frame may be a plate or a frame. The support may be fixed to the casing
of the heat source unit, particularly to one of the walls of the heat source unit
such as the back wall.
[0014] Due to the support, the switchboard can securely be mounted to the casing without
impairing the maintenance access. Thus, higher stress on for example refrigerant piping
attached to and in surface contact with the switchboard, as explained above, may be
avoided.
[0015] According to a fourth aspect the support is mounted to the rear plate of the walls.
[0016] Thus, any forces and stress applied to the switchboard may be spread to the rear
plate. Accordingly, the switchboard is securely mounted to the casing.
[0017] According to a fifth aspect, the support has at least one, particularly two or more,
maintenance opening/-s.
[0018] Accordingly, it is upon removal of the maintenance plate possible to even reach components
in the machine chamber located at a position behind the support through the maintenance
opening/-s. Consequently, no dismounting of the support is required, and ease of maintenance
is obtained. According to a sixth aspect, the support is a rectangular frame having
two first legs parallel to the board and two second legs perpendicular to the first
legs, the support further having an intermediate rib extending between the two first
legs. In this context, "rectangular" defines a frame having a substantially rectangular
base shape, wherein rounded or chamfered edges or corners are still within the scope
of the term "rectangular".
[0019] Accordingly, a good balance may be obtained between forming maintenance openings
in the support to allow access to the components arranged at positions behind the
support and provide rigidity and stability to support the switchboard in the casing.
[0020] According to a seventh aspect, the intermediate rib extends perpendicular to the
two first legs. As compared to e.g. a "V" shaped intermediate rib, two generally rectangular
maintenance openings having a relatively large size are achieved according to the
seventh aspect.
[0021] Consequently, the access to any components hidden behind the support through the
maintenance openings is simplified.
[0022] According to an eighth aspect, the board is attached to the top plate of the casing
and/or the partition alternatively or additionally to the attachment to the support.
[0023] Consequently, the forces and stress applied to the board of the switchboard may be
spread to the top plate and/or the partition. Accordingly, the switchboard is securely
mounted to the casing.
[0024] According to a ninth aspect and alternatively to the above-described support, the
board may also be attached to a support column supported on a bottom plate of the
walls. In one example, the support column may be attached to the bottom plate and
to a lower portion, such as a lower edge of the board of the switchboard.
[0025] As a result, any stresses and forces applied to the board of the switchboard may
be spread to the bottom plate. Hence, the switchboard will be securely mounted to
the casing of the heat source unit.
[0026] According to a tenth aspect, the components configured to control the refrigerant
flow in the refrigerant circuit further comprise a switch, a sensor and/or a valve,
the switch, the sensor and/or the valve being, in a front view of the heat source
unit, located behind the board of the switchboard.
[0027] Consequently, these components are not accessible via the front of the heat source
unit upon detachment of the maintenance plate. Yet, due to the configuration of the
maintenance plate, these components are accessible via the side of the heat source
unit corresponding to the second portion of the maintenance plate. In one example,
at least one of these components is accessible through one of the maintenance openings
in the support.
[0028] According to an eleventh aspect, the maintenance plate is hooked to the casing and
fixed in position at one location by a releasable fastening member. The releasable
fastening member may be a screw.
[0029] In one example according to the twelfth aspect, the maintenance plate is hooked to
the rear plate of the walls and/or the partition.
[0030] According to a thirteenth aspect, the maintenance plate is fixed in position at only
one location by the releasable fastening member.
[0031] Due to this configuration, the maintenance plate may easily be attached and detached
for maintenance further enhancing ease of maintenance.
[0032] According to a fourteenth aspect, at least one edge of the maintenance plate comprises
one or more engaging member/-s having an upwardly or downwardly extending hook, the
engaging member being engaged with a slit-like opening in the casing.
[0033] Thus, the respective edge may easily be hooked to the casing and attachment/detachment
of the maintenance plate is simplified.
[0034] According to a fifteenth aspect, at least the engaging member/-s of one edge additionally
has/have a downwardly or upwardly extending hook, respectively.
[0035] According to this aspect, the edge having the engagement member with the upwardly
and downwardly extending hook may resemble a hinge. Thus, during attachment of the
maintenance plate, the edge may for example with the downwardly extending hook be
hooked to the casing and temporarily held until the engagement member of another edge
is inserted into the respective slit-like opening of the casing and the maintenance
plate is moved upward so that the upwardly extending hooks of the engagement member/-s
of the one edge and the upwardly extending hooks of the engagement member/-s of the
other edge engage behind the respective parts of the casing.
[0036] In one example, one of the edges of the maintenance plate comprises one or more "L"
shaped engaging member/-s having an upwardly or downwardly extending hook, the "L"
shaped engaging member being engaged with a slit-like opening in the casing, for example
the partition or the rear plate. The other of the edges of the maintenance plate comprises
one or more "T" shaped engaging member/-s having an upwardly extending hook and a
downwardly extending hook, the "T" shaped engaging member being engaged with a slit-like
opening in the casing, such as the rear plate or the partition.
Brief Description of the Drawings
[0037] A more complete appreciation of the present disclosure and many of the attendant
advantages thereof will be readily obtained as the same becomes better understood
by reference to the following detailed description when considered in connection with
the accompanying drawings.
[0038] In the drawings,
Figure 1 shows a perspective view on the front of a heat source unit according to
an embodiment;
Figure 2 shows a top view of the heat source unit of figure 1 with the top plate being
removed;
Figure 3A shows a perspective front view of the maintenance plate of the heat source
unit of figure 1;
Figure 3B shows a perspective right side view of the maintenance plate of figure 3A;
Figure 3C shows a perspective left side view of the maintenance plate of figure 3A;
Figure 4A shows a perspective front view of the heat source unit of figure 1 with
a maintenance plate being removed;
Figure 4B shows a perspective right side view of the heat source unit of figure 4A;
Figure 4C shows a perspective view of the heat source unit of figure 4A from the right;
Figure 5 shows an alternative shape of the support; and
Figures 6A and B schematically show the use of a support column instead of the support.
Detailed Description
[0039] Embodiments will now be explained with reference to the drawings. It will be apparent
to those skilled in the field of heat pumps from this disclosure that the following
description of the embodiments is provided for illustration only and not for limiting
the invention as defined by the appended claims.
[0040] Figure 1 shows a heat source unit 1 of a heat pump. The heat source unit 1 comprises
a casing 2. The casing 2 has a bottom 3 formed by a bottom plate 4 and a top 5 formed
by a top plate 6.
[0041] The casing 2 further has a front 7 and an opposite back 8 and opposite sides 9, 10.
[0042] In the present example, the heat source unit 1 is mounted to a horizontal surface
or to a bracket mounted to a vertical wall via feet 11. Thus, the height of the heat
source unit 1 is defined between the bottom 3 and the top 5 (Y direction). The width
or lengths of the heat source unit 1 is defined between the opposite sides 9 and 10
(X direction). The depth of the heat source unit 1 is defined between the front 7
and the back 8 (Z direction).
[0043] The casing 2 or more particularly the walls of the casing, as explained later, define
an interior space visible in the top view of figure 2. The interior space is separated
or divided into an air chamber A and machine chamber M by a partition 12.
[0044] In the present example the walls delimiting the interior space comprise a bell mouth
13 arranged at the front 7 of the heat source unit 1 and delimiting the interior space
at the front 7 of the heat source unit 1 corresponding to the air chamber A. The air
chamber A accommodates a fan 15. The bell mouth 13 comprises a circumferential flange
14 defining an opening and partly accommodating the fan 15. The opening formed by
the flange 14 is covered at the front 7 of the heat source unit 1 by a grille 16.
[0045] The walls further comprise a heat source heat exchanger 17 being part of the refrigerant
circuit of the heat pump. The heat source heat exchanger 17 comprises a first portion
18 delimiting the interior space at the side 10 of the heat source unit 1 corresponding
to the air chamber A. The heat source heat exchanger 17 further comprises a second
portion 19 delimiting the interior space at the back 8 of the heat source unit 1 corresponding
to the air chamber A. Accordingly, the heat source heat exchanger 17 has in the top
view of figure 2 an "L" shape.
[0046] The air chamber A is, thus, defined by the bell mouth 13, the heat source heat exchanger
17 and the partition 12.
[0047] Upon operation of the fan 15 air is sucked in through the heat source heat exchanger
17 at the side 10 and the back 8 and flown through the opening defined by the flange
14 and exhausted at the front 7 of the heat source unit 1. Thereby, refrigerant flowing
through the heat source heat exchanger 17 exchanges heat with the air flowing through
the heat exchanger 17.
[0048] The walls further comprise a rear plate 20. The rear plate 20 has a first portion
21 delimiting the interior space at the back 8 of the heat source unit 1 corresponding
to the machine chamber M. The rear plate 20 further has a second portion 22 delimiting
the interior space at the side 9 of the heat source unit 1 corresponding to the machine
chamber M.
[0049] Moreover, the walls comprise a maintenance plate 23. The maintenance plate 23 comprises
a first portion delimiting the interior space at the front 7 of the heat source unit
1 corresponding to the machine chamber M and a second portion 25 delimiting the interior
space at the side 9 of the heat source unit 1 corresponding to the machine chamber
M. As best visible in the top view of figure 2 and the perspective side view in figure
4B, the second portion 25 covers at least half of the side 9 of the heat source unit
1 in the depth direction (Z direction). In the example, the second portion 25 even
covers more than half of the side 9 of the heat source unit 1 in the depth direction.
[0050] For easy attachment and detachment of the maintenance plate 23 to and from the casing
2 of the heat source unit 1, the maintenance plate is hooked to the casing 2 and fixed
in position at one location by a releasable fastening member 27, such as a screw (see
figure 1). In the shown example, only one releasable fastening member 27 is used to
fix the maintenance plate 23 in position.
[0051] More particularly, the maintenance plate 23 in the shown embodiment is hooked to
the partition 12 and to the rear plate 20. In another example, the maintenance plate
23 may also be hooked to the bell mouth 13.
[0052] For this purpose, the free edge of the first portion 24 of the maintenance plate
23 facing the partition 12 has a plurality of engaging members 28a (two in the present
example). The engaging members 28a are "L" shaped forming a hook extending upward
in the present example, even though a downwardly extending hook is conceivable as
well.
[0053] A front edge of the partition 12 comprises a respective number of slit-like openings
29a (see figure 4A). The engaging members 28a are respectively inserted in the slit-like
openings 29a formed in the front edge of the partition 12. Thereby the engaging members
28a hook behind the front edge of the partition 12 creating a form fit in a forward
direction and fixing the free edge of the first portion 24 of the maintenance plate
23 to the front edge of the partition 12.
[0054] A further ("L" shaped) engaging member 28c may be provided at the first portion 24
of the maintenance plate 23 to be inserted in the same manner into a slit-like opening
29c formed in an auxiliary front plate 30 of the walls of the casing 2.
[0055] As previously mentioned, the maintenance plate 23 is in the shown embodiment also
hooked to the rear plate 20, particularly the second portion 22 of the rear plate
20 or even more particular to a front edge of the second portion 22 of the rear plate
20. For this purpose, a rear edge of the second portion 25 of the maintenance plate
23 has a plurality of engaging members 28b (three in the present example). The engaging
members 28b are respectively inserted in slit-like openings 29b formed in the front
edge of the second portion 22 of the rear plate 20 (see figure 4C).
[0056] The engaging members 28b have at least one hook which extends either upward or downward,
which, upon insertion into the slit-like opening 29b hooks behind the front edge of
the second portion 22 of the rear plate 22, creates a form fit in a forward direction
and fixes the rear edge of the second portion of the maintenance plate 23 to the front
edge of the second portion 22 of the rear plate 20. If simple hooks ("L" shaped engaging
members) are used, the hooks at the rear edge of the second portion 25 of the maintenance
plate 23 and the hooks at the first portion 24 of the maintenance plate 23 should
extend in the same direction (upward or downward).
[0057] Yet, in the present example, the engaging members 28b formed at the rear edge of
the second portion 25 of the maintenance plate 23 are "T" shaped (see figures 3B and
3C). Thus, the engaging members 28b have two hooks, one extending upward and the other
extending downward. Thus, the engaging members 28b at the rear edge of the second
portion 25 of the maintenance plate 23 may serve as a hinge when mounting the maintenance
plate 23.
[0058] All the engaging members 28 a-c are respectively formed at an inner side of the maintenance
plate 23.
[0059] Moreover, the maintenance plate 23 comprises a handle 26 integrated in the first
portion 24 of the maintenance plate 23.
[0060] The machine chamber M is, as explained above, defined by the partition 12, the rear
plate 20 and the maintenance plate 23.
[0061] The heat source heat exchanger 17 at one end extends into the machine chamber M to
connect the heat source heat exchanger 17 to the refrigerant circuit of the heat pump.
The machine chamber M accommodates a plurality of components of the refrigerant circuit
of the heat pump including refrigerant piping and components configured to control
the flow of refrigerant through the refrigerant circuit particularly through the refrigerant
piping.
[0062] The components configured to control the flow of refrigerant through the refrigerant
circuit comprise the main expansion valve 60 of the refrigerant circuit, the 4-way
valve 61 used for switching between a cooling and heating operation, a high-pressure
switch 62, a low-pressure switch, a liquid injection valve 63 and the like.
[0063] Additionally, the components configured to the control the flow of refrigerant through
the refrigerant circuit comprise a switchboard 50. The switchboard 50 comprises a
board 51 having a main surface 52. A plurality of electronical and/or electrical components
53 are mounted on the main surface 52 of the board 51. A cooling bypass 54 may be
branched off the refrigerant circuit and be connected to the main surface 52 of the
board 51 for cooling the electrical/electronical components 53 mounted on the main
surface 52.
[0064] The switchboard 50 is at one side edge of the board 51 attached to the partition
12 and at an opposite side of the board 51 attached to the rear plate 20 via a support
30. Additionally, the switchboard 50 may also be attached to an inner side (lower
side) of the top plate 6.
[0065] The support 40 may be a plate but is, in the shown example, a frame. The support
40 has a substantially rectangular base shape as best visible from figure 4B. Consequently,
the support 40 has two first legs 41 extending parallel to the board 51 and two second
legs 42 extending substantially perpendicular to the board 51 and to the first legs
41. The first legs 41 and the second legs 42 basically form the rectangular base shape
of the support 40. In the present example, the left upper corner of the support 40
is chamfered. In addition, it is apparent that the first legs 41 and the second legs
42 define a plane which extends substantially perpendicular to the main surface 52
of the board 51. Consequently, the support 40 extends away from the board 51 towards
the rear plate 20, more particularly towards the first portion 21 of the rear plate
20.
[0066] An intermediate rib 43 is formed at a position intermediate the two second legs 42.
The intermediate rib 43 may be centered between the two second legs 42. However, it
is also conceivable that the intermediate rib 43 is closer to one of the second legs
42 than to the other. It is also possible to provide more than one intermediate rib
43 if higher rigidity is required. Alternatively, the support 140 may be configured
as shown in figure 5 having a "V" shaped intermediate rib 143. In this support 140
three maintenance openings 144 are formed, which are smaller in size than the maintenance
openings 44. The support 140 has the advantage of a higher rigidity as compared to
the support 40 but due to the smaller size of the maintenance openings 144, it is
more difficult to access the components in the machine chamber M through the maintenance
openings 144 as compared to the maintenance openings 44.
[0067] As previously mentioned, the support 40 defines two maintenance openings 44. The
maintenance openings 44 are respectively defined by one of the second legs 42, portions
of the first legs 41 and the intermediate rib 43.
[0068] The support 40 is mounted to the rear plate 20, particularly the second portion 22
of the rear plate 20 at its first legs 41 adjacent to a front edge of the second portion
22 of the rear plate 20.
[0069] In one example, it is conceivable to attach the board 51 to the partition 12 and
an inner side of the top plate 16 only. Yet, according to the shown embodiment, the
board 51 is attached to the support 40, particularly to the first legs 41 of the support
40 adjacent to the board 51. For this purpose, the switchboard may have slit-like
openings 55 and the support 40 may have hooks 45 (see figure 4A). In the present example,
the hooks 45 extend downward towards the bottom 3. To fix the switchboard 50 to the
support 40 the hooks 45 are inserted into the slit-like openings 55 and the switchboard
50 is moved upward to engage the hooks 45 with the switchboard 50 and realize a form
fit.
[0070] Additionally, the switchboard 50 is, in the present example, attached to the partition
12 at the edge opposite to the edge at which the switchboard 50 is attached to the
support 40.
[0071] Thus, the switchboard 50 is securely fixed to the casing 2 of the heat source unit
1 and any forces and/or stress applied to the switchboard 50 are spread to the partition
12 and, via the support 42, to the rear plate 20.
[0072] If maintenance of some components in the machine chamber M is required, the maintenance
plate 23 must be detached.
[0073] For this purpose, the releasable fastening member 27 must be removed. Subsequently,
the maintenance plate 23 may be slid downward so that the engaging members 28a-c move
downward in the respective slit-like opening 29a-c. If the engaging members have moved
down to a lower border of the slit like openings 29a-c, the engaging members 28a and
28c may be withdrawn from the slit-like openings 29a and 29c. On the other hand, the
downwardly extending hook of the engaging members 28b hooks behind the front edge
of the second portion 22 of the rear plate 20 so that another form fit in a forward
direction is created. Subsequently, the maintenance plate 23 may be rotated about
the engaging members 28b serving as a hinge giving access particularly to the front
of the machine chamber M such as the electrical/electronical components 53 of the
switchboard 50 or other components accessible from the front such as the main expansion
valve 60 (see figure 4A).
[0074] If necessary, the maintenance plate 23 may also be completely removed by again sliding
the maintenance plate 23 upward to some extent to enable disengagement of the engaging
members 28b from the slit-like openings 29b.
[0075] Upon removal of the maintenance plate 23 some of the components in the machine chamber
M which require maintenance are accessible through the side 9 of the heat source unit
1 (figure 4B). For example, the main expansion valve 60 may be more easily accessible
from the side 9. Additionally, some components are accessible through the maintenance
openings 44 in the support 40 such as the 4-way valve 61, the high pressure switch
62 and the liquid injection valve 63.
[0076] Accordingly, ease of maintenance is achieved in that the components are easily accessible
without having to dismantle some of the components in the machine chamber M and due
to the easy detachment of the maintenance plate 23.
[0077] After maintenance, the maintenance plate 23 will again be attached. For this purpose,
the engaging members 28b are again inserted into the slit-like openings 29b at the
front edge of the second portion 22 of the rear plate 20. Subsequently, the maintenance
plate 23 is slid downward to engage the downwardly extending hooks of the engaging
members 28b with the front edge of the second portion 22 of the rear plate 20. Subsequently,
the maintenance plate 23 may be rotated about the engaging members 28b serving as
a hinge to also insert the engaging members 28a and 28c into the slit like openings
29a and 29c. Subsequently, the maintenance plate 23 is again moved upward so that
an upper edge 31 (see figure 3A to C) of the maintenance plate 23 engages behind a
circumferential rim 32 of the top plate 6 and the engaging members 28a-c or more particularly
their upwardly directed hooks, respectively engaged with the front edge of the second
portion 22 of the rear plate 20 and of the partition 12 as well as the auxiliary front
plate 30, create a form fit in a forward direction. To fix the maintenance plate 23
in this position the releasable fastening member 27 is again fastened.
[0078] It is to be understood that the present description of an embodiment is not considered
to be limiting. Rather several modifications may be realized by the skilled person.
Instead of using the support 40, the switchboard 50 may also be exclusively attached
to the partition 12 and/or an inner side (lower side) of the top plate 6. In a further
alternative, the switchboard 50 may be supported by a support column 1140 as shown
schematically in figures 6A and B and optionally to the partition 12.
List of References
[0079]
- 1
- heat source unit
- 2
- casing
- 3
- bottom
- 4
- bottom plate
- 5
- top
- 6
- top plate
- 7
- front
- 8
- back
- 9
- side
- 10
- side
- 11
- foot
- 12
- partition
- 13
- bell mouth
- 14
- flange
- 15
- fan
- 16
- grille
- 17
- heat source heat exchanger
- 18
- first portion of the heat source heat exchanger
- 19
- second portion of the heat source heat exchanger
- 20
- rear plate
- 21
- first portion of rear plate
- 22
- second portion of rear plate
- 23
- maintenance plate
- 24
- first portion of maintenance plate
- 25
- second portion of maintenance plate
- 26
- handle
- 27
- fastening member
- 28
- engaging member
- 29
- slit-like opening
- 30
- auxiliary front plate
- 31
- upper edge
- 32
- rim
- 40
- support
- 140
- support
- 1140
- support column
- 41
- first leg
- 141
- first leg
- 42
- second leg
- 142
- second leg
- 43
- intermediate rib
- 143
- intermediate rib
- 44
- maintenance opening
- 144
- maintenance opening
- 45
- hook
- 50
- switchboard
- 51
- board
- 52
- main surface
- 53
- electrical/electronic component
- 54
- cooling bypass
- 55
- slit-like opening
- 60
- main expansion valve
- 61
- 4-Way valve
- 62
- high-pressure switch
- 63
- liquid injection valve
- A
- air chamber
- M
- machine chamber
1. Heat source unit for a heat pump having a refrigerant circuit, the heat source unit
comprising:
a casing (2) having walls defining an interior space, the interior space being separated
by a partition (12) into an air chamber (A) and a machine chamber (M);
a plurality of components (50, 60, 61, 62, 63) configured to control a refrigerant
flow through the refrigerant circuit, the components being accommodated in the machine
chamber (M),
wherein the walls comprise a maintenance plate (23), the maintenance plate having
a first portion (24) delimiting the interior space at a front (7) of the heat source
unit in a position corresponding to the machine chamber (M) and a second portion (25)
delimiting the interior space at a side (9) of the heat source unit corresponding
to the machine chamber (M), the maintenance plate (23) being removable for giving
access to the components (50, 60, 61, 62, 63) in the machine chamber (M),
wherein the second portion (25) of the maintenance plate (23) covers at least half
of the side (9) of the heat source unit in a direction of depth, the depth being the
dimension of the heat source unit between the front (7) and a back (8).
2. Heat source unit according to claim 1, wherein the components comprise a switch board
(50) having a board (51) and electrical and/or electronical components (53) mounted
on a main surface (52) of the board, wherein the main surface (52) faces an inner
side of the first portion (24) of the maintenance plate (23).
3. Heat source unit according to claim 2, wherein the board (51) is attached to a support
frame (40; 140) extending perpendicularly to the main surface (52) of the board (51)
away from the first portion (24) of the maintenance plate (23) .
4. Heat source unit according to claim 3, wherein the support frame (40; 140) is mounted
to a rear plate (20) of the walls.
5. Heat source unit according to claim 3 or 4, wherein the support frame (40; 140) has
at least one, particularly two or more, maintenance opening/-s (44; 144).
6. Heat source unit according to claim 3, 4 or 5, wherein the support frame is rectangular
having two first legs parallel to the board (51) and two second legs (42; 142) perpendicular
to the first legs, the support frame (40; 140) further having an intermediate rib
(43; 143) extending between the two first legs (41; 141).
7. Heat source unit according to claim 6, wherein the intermediate rib (43) extends perpendicular
to the two first legs (41).
8. Heat source unit according to any one of claims 2 to 6, wherein the board (50) is
attached to a top plate (6) of the casing (2).
9. Heat source unit according to claim 2, wherein the board (50) is attached to a support
column (1140) supported on a bottom plate (4) of the walls.
10. Heat source unit according to any one of claims 2 to 9, wherein the components comprise
a switch, a sensor and/or a valve, the switch, the sensor and/or the valve being,
in a front view, located behind the board (51).
11. Heat source unit according to any one of the preceding claims, wherein the maintenance
plate (23) is hooked to the casing (2) and fixed in position at one location by a
releasable fastening member (27).
12. Heat source unit according to claim 11, wherein the maintenance plate (23) is hooked
to a rear plate (22) of the walls and/or to the partition (12).
13. Heat source unit according to claim 11 or 12, wherein the maintenance plate (23) is
fixed in position at only one location, by the releasable fastening member (27).
14. Heat source unit according to any one of claims 11 to 13, wherein at least one edge
of the maintenance plate (23) comprises one or more engaging member/-s (28a, 28b)
having an upwardly extending hook, the engaging member (28a) being engaged with a
slit-like opening (29a, 29b) in the casing (2).
15. Heat source unit according to claim 14, wherein at least the engaging member/-s (28b)
of one edge additionally has/have a downwardly or upwardly extending hook.
Amended claims in accordance with Rule 137(2) EPC.
1. Heat source unit for a heat pump having a refrigerant circuit, the heat source unit
comprising:
a casing (2) having walls defining an interior space, the interior space being separated
by a partition (12) into an air chamber (A) and a machine chamber (M);
a plurality of components (50, 60, 61, 62, 63) configured to control a refrigerant
flow through the refrigerant circuit, the components being accommodated in the machine
chamber (M),
wherein the walls comprise a maintenance plate (23), the maintenance plate having
a first portion (24) delimiting the interior space at a front (7) of the heat source
unit in a position corresponding to the machine chamber (M) and a second portion (25)
delimiting the interior space at a side (9) of the heat source unit corresponding
to the machine chamber (M), the maintenance plate (23) being removable for giving
access to the components (50, 60, 61, 62, 63) in the machine chamber (M),
wherein the second portion (25) of the maintenance plate (23) covers at least half
of the side (9) of the heat source unit in a direction of depth, the depth being the
dimension of the heat source unit between the front (7) and a back (8); and
wherein the components comprise a switch board (50) having a board (51) and electrical
and/or electronical components (53) mounted on a main surface (52) of the board, wherein
the main surface (52) faces an inner side of the first portion (24) of the maintenance
plate (23), characterized in that
the board (51) is attached to a support frame (40; 140) extending perpendicularly
to the main surface (52) of the board (51) away from the first portion (24) of the
maintenance plate (23).
2. Heat source unit according to claim 1, wherein the support frame (40; 140) is mounted
to a rear plate (20) of the walls.
3. Heat source unit according to claim 1 or 2, wherein the support frame (40; 140) has
at least one, particularly two or more, maintenance opening/-s (44; 144).
4. Heat source unit according to any one of the preceding claims, wherein the support
frame is rectangular having two first legs parallel to the board (51) and two second
legs (42; 142) perpendicular to the first legs, the support frame (40; 140) further
having an intermediate rib (43; 143) extending between the two first legs (41; 141).
5. Heat source unit according to claim 4, wherein the intermediate rib (43) extends perpendicular
to the two first legs (41).
6. Heat source unit according to any one of the preceding claims, wherein the board (51)
is attached to a top plate (6) of the casing (2).
7. Heat source unit for a heat pump having a refrigerant circuit, the heat source unit
comprising:
a casing (2) having walls defining an interior space, the interior space being separated
by a partition (12) into an air chamber (A) and a machine chamber (M);
a plurality of components (50, 60, 61, 62, 63) configured to control a refrigerant
flow through the refrigerant circuit, the components being accommodated in the machine
chamber (M),
wherein the walls comprise a maintenance plate (23), the maintenance plate having
a first portion (24) delimiting the interior space at a front (7) of the heat source
unit in a position corresponding to the machine chamber (M) and a second portion (25)
delimiting the interior space at a side (9) of the heat source unit corresponding
to the machine chamber (M), the maintenance plate (23) being removable for giving
access to the components (50, 60, 61, 62, 63) in the machine chamber (M),
wherein the second portion (25) of the maintenance plate (23) covers at least half
of the side (9) of the heat source unit in a direction of depth, the depth being the
dimension of the heat source unit between the front (7) and a back (8); and
wherein the components comprise a switch board (50) having a board (51) and electrical
and/or electronical components (53) mounted on a main surface (52) of the board, wherein
the main surface (52) faces an inner side of the first portion (24) of the maintenance
plate (23), characterized in that
the board (51) is attached to a top plate (6) of the casing (2).
8. Heat source unit for a heat pump having a refrigerant circuit, the heat source unit
comprising:
a casing (2) having walls defining an interior space, the interior space being separated
by a partition (12) into an air chamber (A) and a machine chamber (M);
a plurality of components (50, 60, 61, 62, 63) configured to control a refrigerant
flow through the refrigerant circuit, the components being accommodated in the machine
chamber (M),
wherein the walls comprise a maintenance plate (23), the maintenance plate having
a first portion (24) delimiting the interior space at a front (7) of the heat source
unit in a position corresponding to the machine chamber (M) and a second portion (25)
delimiting the interior space at a side (9) of the heat source unit corresponding
to the machine chamber (M), the maintenance plate (23) being removable for giving
access to the components (50, 60, 61, 62, 63) in the machine chamber (M),
wherein the second portion (25) of the maintenance plate (23) covers at least half
of the side (9) of the heat source unit in a direction of depth, the depth being the
dimension of the heat source unit between the front (7) and a back (8); and
wherein the components comprise a switch board (50) having a board (51) and electrical
and/or electronical components (53) mounted on a main surface (52) of the board, wherein
the main surface (52) faces an inner side of the first portion (24) of the maintenance
plate (23), characterized in that
the board (51) is attached to a support column (1140) supported on a bottom plate
(4) of the walls.
9. Heat source unit according to any one of the preceding claims, wherein the components
comprise a switch, a sensor and/or a valve, the switch, the sensor and/or the valve
being, in a front view, located behind the board (51).
10. Heat source unit according to any one of the preceding claims, wherein the maintenance
plate (23) is hooked to the casing (2) and fixed in position at one location by a
releasable fastening member (27).
11. Heat source unit according to claim 10, wherein the maintenance plate (23) is hooked
to a rear plate (22) of the walls and/or to the partition (12).
12. Heat source unit according to claim 10 or 11, wherein the maintenance plate (23) is
fixed in position at only one location, by the releasable fastening member (27).
13. Heat source unit according to any one of claims 10 to 12, wherein at least one edge
of the maintenance plate (23) comprises one or more engaging member/-s (28a, 28b)
having an upwardly extending hook, the engaging member (28a) being engaged with a
slit-like opening (29a, 29b) in the casing (2).
14. Heat source unit according to claim 13, wherein at least the engaging member/-s (28b)
of one edge additionally has/have a downwardly or upwardly extending hook.