FIELD
[0001] Embodiments of the present invention relate to a rotary compressor and a refrigeration
cycle device.
BACKGROUND
[0002] As a rotary compressor used in a refrigeration cycle device such as an air conditioner,
a configuration including a container in which lubricating oil is stored and a compression
mechanism accommodated in the container is known. The compression mechanism includes
a cylindrical cylinder, a closing plate which closes an opening of the cylinder, and
a roller which rotates eccentrically in a cylinder chamber formed with the cylinder
and the closing plate. In a blade groove formed in the cylinder, a blade dividing
the inside of the cylinder chamber into a compression chamber and a suction chamber
is disposed. The blade is in contact with the roller and advances into and retreats
from the inside of the cylinder chamber in accordance with eccentric rotation of the
roller.
[0003] It is preferable that the above-described blade slide with respect to the closing
plate in a state in which lubricating oil is interposed between the blade and the
closing plate. Thereby, it is considered that sealing between the blade and the closing
plate can be secured while reducing abrasion between the blade and the closing plate.
[0004] As a configuration for interposing lubricating oil between the blade and the closing
plate, a configuration in which an oil supply groove extending in a movement direction
of the blade is formed on a surface of the blade facing the closing plate is conceivable.
Specifically, a first end of the oil supply groove opens toward an inside of the container
outside the cylinder chamber. A second end of the oil supply groove terminates within
the blade. According to this configuration, since lubricating oil in the container
is introduced into the oil supply groove, it is considered that lubricating oil is
easily supplied between the blade and the closing plate.
[0005] However, in the rotary compressor described above, foreign matter such as abrasion
powder present in the container is introduced into the oil supply groove together
with the lubricating oil and may accumulate in the oil supply groove according to
the lapse of an operation time. In this case, an actual volume of the oil supply groove
may be reduced, the opening of the oil supply groove may be blocked, and thus there
is a possibility that it will become difficult to interpose a desired amount of lubricating
oil between the blade and the closing plate.
[0006] JP 2006 258001 A discloses a hermetic compressor with good volumetric efficiency, for supplying oil
to end faces of vanes and a roller. In this hermetic compressor, a first oil groove
12a whose one end communicates with a lubricating oil reservoir part 13 is formed
in at least one of end faces of the vanes 12 of a rotary compression element 4. An
annular second oil groove 10a is formed in an end face on the same side as the first
oil groove 12 of the vane 12 of the roller 10. A third oil groove 6a, connecting the
first oil groove 12a with the second oil groove 10a, is formed in at least one of
a main bearing 6 and a sub-bearing 7 opposed to the first oil groove 12a of the vane
12 and the second oil groove 10a of the roller 10.
[0007] JP H08 159071 A discloses a compressor capable of constantly supplying sufficient lubricating oil
to a large load part of a sliding part of a cylinder and a vane, and which can prevent
lowering of efficiency due to oil feeding failure, even in the case of driving under
a severe condition of high temperature and high pressure and that quantity of lubricating
oil in the compressor decreases.
PRIOR ART DOCUMENTS
[0008] [PATENT DOCUMENT 1] Japanese Unexamined Patent Application, First Publication No.
H04-191491
SUMMARY
PROBLEMS TO BE SOLVED BY THE INVENTION
[0009] The present invention is directed to providing a rotary compressor and a refrigeration
cycle device in which operation reliability can be maintained over a long period of
time.
MEANS FOR SOLVING THE PROBLEMS
[0010] A rotary compressor of an embodiment includes a container, a cylinder, a closing
plate, a roller, a blade, and an oil supply groove. The container stores lubricating
oil. The cylinder is accommodated in the container. The closing plate closes an opening
of the cylinder and forms a cylinder chamber together with the cylinder. The roller
eccentrically rotates in the cylinder chamber. The blade is provided in a blade groove
formed in the cylinder, in contact with the roller to divide an inside of the cylinder
chamber, and able to advance into and retreat from the inside of the cylinder chamber
in accordance with eccentric rotation of the roller. The oil supply groove is formed
on a facing surface of the blade facing the closing plate and extends in a movement
direction of the blade. The oil supply groove has a first end which communicates with
an inside of the container outside the cylinder chamber and a second end terminated
within the blade. Surface roughness of a bottom surface of the oil supply groove is
smaller than surface roughness of a back surface positioned close to the first end
in outer surfaces of the blade.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011]
FIG. 1 is a schematic configuration view of a refrigeration cycle device including
a cross-sectional view of a rotary compressor in a first embodiment.
FIG. 2 is a cross-sectional view of a compression mechanism corresponding to line
II-II of FIG. 1.
FIG. 3 is a cross-sectional view of a blade taken along line III-III of FIG. 2.
FIG. 4 is an enlarged view of a portion IV of FIG. 1.
FIG. 5 is a cross-sectional view of a blade in a second embodiment corresponding to
FIG. 3.
DETAILED DESCRIPTION
[0012] Hereinafter, a rotary compressor and a refrigeration cycle device of an embodiment
will be described with reference to the drawings.
(First embodiment)
[0013] First, a refrigeration cycle device 1 will be briefly described. FIG. 1 is a schematic
configuration view of the refrigeration cycle device 1 including a cross-sectional
view of a rotary compressor 2 in a first embodiment.
[0014] As shown in FIG. 1, the refrigeration cycle device 1 of the present embodiment includes
the rotary compressor 2, a radiator (condenser) 3 connected to the rotary compressor
2, an expansion device 4 connected to the radiator 3, and an evaporator 5 connected
between the expansion device 4 and the rotary compressor 2.
[0015] The rotary compressor 2 is a so-called rotary type compressor. The rotary compressor
2 compresses a low-pressure gaseous refrigerant introduced into the rotary compressor
2 into a high-temperature and high-pressure gaseous refrigerant. A specific configuration
of the rotary compressor 2 will be described below.
[0016] The radiator 3 radiates heat from the high-temperature and high-pressure gaseous
refrigerant sent from the rotary compressor 2, and converts the high-temperature and
high-pressure gaseous refrigerant into a high-pressure liquid refrigerant.
[0017] The expansion device 4 reduces the pressure of the high-pressure liquid refrigerant
sent from the radiator 3 and converts the high-pressure liquid refrigerant into a
low-temperature and low-pressure liquid refrigerant.
[0018] The evaporator 5 evaporates the low-temperature and low-pressure liquid refrigerant
sent from the expansion device 4 and converts the low-temperature and low-pressure
liquid refrigerant into a low-pressure gaseous refrigerant. In the evaporator 5, evaporation
of the low-pressure liquid refrigerant dissipates evaporation heat from the surroundings,
and thus the surroundings are cooled. The low-pressure gaseous refrigerant that has
passed through the evaporator 5 is introduced into the rotary compressor 2 described
above.
[0019] As described above, in the refrigeration cycle device 1 of the present embodiment,
a refrigerant serving as a working fluid circulates while changing its phase between
a gaseous refrigerant and a liquid refrigerant.
[0020] Next, the above-described rotary compressor 2 will be described.
[0021] The rotary compressor 2 of the present embodiment includes a compressor main body
11 and an accumulator 12.
[0022] The accumulator 12 is a so-called gas-liquid separator. The accumulator 12 is provided
between the evaporator 5 and the compressor main body 11 described above. The accumulator
12 is connected to the compressor main body 11 via a suction pipe 21. The accumulator
12 supplies only the gaseous refrigerant among the gaseous refrigerant evaporated
in the evaporator 5 and the liquid refrigerant not evaporated in the evaporator 5
to the compressor main body 11.
[0023] The compressor main body 11 includes a rotating shaft 31, an electric motor 32, a
compression mechanism 33, and a sealed container (container) 34 which accommodates
the rotating shaft 31, the electric motor 32, and the compression mechanism 33.
[0024] The sealed container 34 is formed in a cylindrical shape. Opposite end of the sealed
container 34 in a direction of the axis O are closed. Lubricating oil J is contained
in the sealed container 34. A portion of the compression mechanism 33 is immersed
in the lubricating oil J.
[0025] The rotating shaft 31 is disposed coaxially along the axis O of the sealed container
34. In the following description, a direction along the axis O is simply referred
to as an axial direction, a portion close to the electric motor 32 in the axial direction
is referred to as an upper side, and a portion close to the compression mechanism
33 in the axial direction is referred to as a lower side. Also, a direction perpendicular
to the axial direction is referred to as a radial direction, and a direction around
the axis O is referred to as a circumferential direction.
[0026] The electric motor 32 is a so-called inner rotor type direct current (DC) brushless
motor. The electric motor 32 includes a cylindrical stator 35 and a columnar rotor
36 disposed on an inner side of the stator 35.
[0027] The stator 35 is fixed to an inner wall surface of the sealed container 34 by shrinkage-fitting
or the like. The rotor 36 is fixed to an upper portion of the rotating shaft 31. The
rotor 36 is disposed on the inner side of the stator 35 at an interval in the radial
direction.
[0028] The compression mechanism 33 includes a cylindrical cylinder 41, a main bearing (closing
plate) 42 and a sub bearing (closing plate) 43 for closing opposite end openings of
the cylinder 41.
[0029] The rotating shaft 31 passes through the cylinder 41. The main bearing 42 and the
sub bearing 43 rotatably support the rotating shaft 31. A space formed by the cylinder
41, the main bearing 42, and the sub bearing 43 constitutes a cylinder chamber 46
(see FIG. 2).
[0030] An eccentric portion 51 that is eccentric in the radial direction with respect to
the axis O is formed at a portion positioned inside the cylinder chamber 46 in the
above-described rotating shaft 31.
[0031] A roller 53 is externally fitted to the eccentric portion 51. The roller 53 is configured
to be eccentrically rotatable with respect to the axis O while an outer circumferential
surface thereof is in sliding contact with an inner circumferential surface of the
cylinder 41 according to rotation of the rotating shaft 31.
[0032] FIG. 2 is a cross-sectional view of the compression mechanism 33 corresponding to
a line II-II of FIG. 1.
[0033] As shown in FIGS. 1 and 2, a blade groove 54 recessed toward the outside in the radial
direction is formed at a portion in the circumferential direction of the cylinder
41. The blade groove 54 is formed over the entire axial direction of the cylinder
41. The blade groove 54 communicates with the inside of the sealed container 34 at
an outer end in the radial direction.
[0034] A blade 55 is provided in the blade groove 54. The blade 55 is configured to be slidably
movable in the radial direction with respect to the cylinder 41. As shown in FIG.
1, an outer end surface (hereinafter referred to as a back surface) of the blade 55
in the radial direction is urged toward the inside in the radial direction by an urging
member 57. On the other hand, as shown in FIG. 2, an inner end surface (hereinafter
referred to as a distal end surface) of the blade 55 in the radial direction is in
contact with an outer circumferential surface of the roller 53 in the cylinder chamber
46. Thereby, the blade 55 is configured to be able to advance into and retreat from
the cylinder chamber 46 according to eccentric rotation of the roller 53. Further,
in a plan view seen from the axial direction, the distal end surface of the blade
55 is formed in an arc shape which is protrudes toward the inside in the radial direction.
A specific configuration of the blade 55 will be described below.
[0035] The cylinder chamber 46 is divided into a suction chamber and a compression chamber
by the roller 53 and the blade 55. Thus, in the compression mechanism 33, a compression
operation is performed in the cylinder chamber 46 by a rotating operation of the roller
53 and an advancing and retreating operation of the blade 55.
[0036] In the cylinder 41, a suction hole 56 that penetrates the cylinder 41 in the radial
direction is formed at a portion positioned on an back side of the blade groove 54
(left side of the blade groove 54 in FIG. 2) in a rotation direction (see the arrow
in FIG. 2) of the roller 53. The suction pipe 21 (see FIG. 1) described above is connected
to the suction hole 56 from the outer end in the radial direction. On the other hand,
an inner end in the radial direction of the suction hole 56 opens into the cylinder
chamber 46.
[0037] In the inner circumferential surface of the cylinder 41, a discharge groove 58 is
formed at a portion positioned on a front side of the blade groove 54 (right side
of the blade groove 54 in FIG. 2) in the rotation direction of the roller 53. The
discharge groove 58 is formed in a semicircular shape in a plan view seen from the
axial direction.
[0038] As shown in FIG. 1, the main bearing 42 closes an upper end opening of the cylinder
41. The main bearing 42 rotatably supports a portion of the rotating shaft 31 positioned
above the cylinder 41. Specifically, the main bearing 42 includes a tube 61 through
which the rotating shaft 31 is inserted, and a flange 62 protruding toward the outside
in the radial direction from a lower end of the tube 61.
[0039] As shown in FIGS. 1 and 2, a discharge hole 64 (see FIG. 2) penetrating the flange
62 in the axial direction is formed at a portion of the flange 62 in the circumferential
direction. The discharge hole 64 communicates with the inside of the cylinder chamber
46 through the above-described discharge groove 58. A discharge valve mechanism (not
shown) which opens and closes the discharge hole 64 in accordance with a pressure
increase in the cylinder chamber 46 (compression chamber) and discharges a refrigerant
to the outside of the cylinder chamber 46 is disposed in the flange 62.
[0040] As shown in FIG. 1, a muffler 65 which covers the main bearing 42 from above is provided
on the main bearing 42. A communication hole 66 is formed in the muffler 65 to communicate
the inside and outside of the muffler 65. The high-temperature and high-pressure gaseous
refrigerant discharged through the above-described discharge hole 64 is discharged
into the sealed container 34 through the communication hole 66.
[0041] The sub bearing 43 closes a lower end opening of the cylinder 41. The sub bearing
43 rotatably supports a portion of the rotating shaft 31 positioned below the cylinder
41. Specifically, the sub bearing 43 includes a tube 71 through which the rotating
shaft 31 is inserted, and a flange 72 protruding toward the outside in the radial
direction from an upper end of the tube 71.
[0042] As shown in FIGS. 1 and 2, the blade 55 described above is formed in a rectangular
shape extending in the radial direction. The lubricating oil J is interposed between
the blade 55 and inner wall surfaces of the blade groove 54, and the flange s 62 and
72 of the respective bearings 42 and 43. Therefore, side surfaces of the blade 55
facing the blade groove 54 (side surfaces toward opposite sides in a width direction
(circumferential direction)) can slide on the inner wall surfaces of the blade groove
54 with an oil film interposed therebetween. Also, an upper end surface of the blade
55 can slide on a lower surface of the flange 62 with the oil film interposed therebetween.
A lower end surface of the blade 55 can slide on an upper surface of the flange 72
with the oil film interposed therebetween. That is, in the blade 55 of the present
embodiment, portions of the outer surfaces excluding the above-described back surface
(the side surface, the upper end surface, and the lower end surface) function as sliding
surfaces.
[0043] On the upper and lower end surfaces (surfaces facing the flange 62 and 72) of the
blade 55, oil supply grooves 81 recessed toward an inner side in the axial direction
extend in the radial direction at a center in a blade width direction. As shown in
FIG. 2, the oil supply grooves 81 extend in a straight line in the radial direction
(a movement direction of the blade 55) in a plan view seen from the axial direction.
A groove width H of the oil supply grooves 81 is made uniform throughout the radial
direction. Further, the oil supply grooves 81 can be formed by a cutting process using
a disk-shaped cutter or the like. In addition, a volume of the oil supply grooves
81 is preferably set in accordance with a capacity of the lubricating oil J required
for the operation region (hereinafter referred to as a latter half of a compression
stroke) in which the blade 55 shifts from a bottom dead center at which the blade
55 protrudes most in the cylinder chamber 46 to the top dead center at which the blade
55 is retreated most from the cylinder chamber 46.
[0044] As shown in FIG. 1, each of the oil supply groove 81 has a straight extending portion
82 positioned close to the outer end (first end) in the radial direction and an inclined
portion 83 continuous to the inner end (second end) in the radial direction of the
straight extending portion 82.
[0045] In the straight extending portion 82, a groove depth in the axial direction is made
uniform throughout the radial direction. In the straight extending portion 82, the
outer end in the radial direction opens on the back surface of the blade 55. Thereby,
the outer end in the radial direction of the straight extending portion 82 communicates
with the inside of the sealed container 34 outside the cylinder chamber 46 through
the blade groove 54. The lubricating oil J stored in the sealed container 34 is introduced
into the oil supply groove 81 through the blade groove 54. In the present embodiment,
the oil supply groove 81 has a maximum groove depth E (depth of the straight extending
portion 82 in the present embodiment) which is larger than the groove width H (see
FIG. 2).
[0046] In the inclined portion 83, the groove depth gradually decreases toward the inner
side in the radial direction. Specifically, a bottom surface of the inclined portion
83 is formed in an arc shape which is protrudes toward the inner side in the axial
direction in a side view seen from the blade width direction. The inner end in the
radial direction of the inclined portion 83 is terminated within the blade 55 in a
state in which it is close to the distal end surface (the second end surface) of the
blade 55. That is, the oil supply groove 81 does not reach the distal end surface
of the blade 55 and does not communicate with the inside of the cylinder chamber 46.
Further, the oil supply groove 81 is formed such that at least the inclined portion
83 is positioned in the cylinder chamber 46 when the blade 55 protrudes most in the
cylinder chamber 46.
[0047] FIG. 3 is a cross-sectional view of the blade 55 corresponding to line III-III of
FIG. 2.
[0048] As shown in FIG. 3, first chamfered portions 75 are formed at each corner formed
by each side surface and upper and lower end surfaces of the blade 55. Further, in
an example shown in FIG. 3, each of the first chamfered portions 75 is formed over
the entire length in the radial direction of the blade 55. However, the first chamfered
portion 75 may be formed in a portion of the blade 55 in the radial direction.
[0049] On the other hand, second chamfered portions 76 are formed at each corner between
the upper and lower end surfaces of the blade 55 and inner side surfaces of the oil
supply groove 81. A chamfering amount L2 (a depth in the axial direction from the
upper and lower end surfaces of the blade 55) of the second chamfered portion 76 is
larger than a chamfering amount L1 of the first chamfered portion 75. Further, in
the shown example, the second chamfered portion 76 is formed over the entire length
in the radial direction of the oil supply groove 81. However, the second chamfered
portions 76 may be formed in a portion of the oil supply groove 81 in the radial direction.
Further, each of the chamfered portions 75 and 76 is subjected to bevel-chamfering
(C chamfered) with a depression angle of 45° with respect to the upper and lower end
surfaces of the blade 55. However, the depression angle of each of the chamfered portions
75 and 76 with respect to the upper and lower end surfaces of the blade 55 can be
appropriately changed. In addition, each of the chamfered portions 75 and 76 is not
limited to bevel-chamfering, and it may be round-chamfering (R chamfered) or the like.
[0050] As shown in FIG. 2, portions of the upper and lower end surfaces of the blade 55
other than the oil supply grooves 81 and the chamfered portions 75 and 76 function
as sealing surfaces. The sealing surfaces surround the oil supply grooves 81 from
three sides excluding the outside in the radial direction. The sealing surfaces face
the respective flanges 62 and 72 with the oil film interposed therebetween. In this
case, communication between the inside of the compression chamber and the inside of
the suction chamber through a space between the sealing surfaces of the blade 55 and
the flange 62 and 72 is blocked by the oil film. In the present embodiment, seal widths
S1 and S2 of portions of the sealing surfaces positioned on both sides in the blade
width direction with respect to the oil supply groove 81 and a seal width S3 in the
radial direction between an inner end edge of the oil supply groove 81 in the radial
direction and the distal end surface of the blade 55 are equal to one another. Further,
the groove width H of the oil supply groove 81 is smaller than a minimum width of
the sealing surface.
[0051] Here, surface roughness of a bottom surface of the oil supply groove 81 is smaller
than surface roughness of the back surface of the blade 55. In the present embodiment,
the surface roughness is a value of the ten point average roughness Rzjis standardized
in JIS B 0601. In the present embodiment, it is also preferable that surface roughness
of the inner side surfaces of the oil supply groove 81 be smaller than the surface
roughness of the back surface of the blade 55. Further, it is preferable that the
surface roughness of the bottom surface of the oil supply groove 81 be equal to the
surface roughness of the inner side surfaces of the oil supply groove 81 or smaller
than the surface roughness of the inner side surfaces of the oil supply groove 81.
[0052] Next, an operation of the above-described rotary compressor 2 will be described.
[0053] When power is supplied to the stator 35 of the electric motor 32 as shown in FIG.
1, the rotating shaft 31 rotates around the axis O together with the rotor 36. Also,
as the rotating shaft 31 rotates, the eccentric portion 51 and the roller 53 rotate
eccentrically in the cylinder chamber 46. At this time, the roller 53 is in sliding
contact with the inner circumferential surface of the cylinder 41. Thereby, the gaseous
refrigerant is introduced into the cylinder chamber 46 through the suction pipe 21,
and the gaseous refrigerant introduced into the cylinder chamber 46 is compressed.
[0054] Specifically, in the cylinder chamber 46, the gaseous refrigerant is suctioned into
the suction chamber through the suction hole 56 and the gaseous refrigerant that has
been suctioned earlier from the suction hole 56 is compressed in the compression chamber.
The compressed gaseous refrigerant is discharged to the outside of the cylinder chamber
46 (inside the muffler 65) through the discharge hole 64 of the main bearing 42, and
then discharged into the sealed container 34 through the communication hole 66 of
the muffler 65. The gaseous refrigerant discharged into the sealed container 34 is
sent to the radiator 3 as described above.
[0055] Here, since the inside of the oil supply groove 81 of the blade 55 communicates with
the inside of the sealed container 34 through the blade groove 54, the inside of the
oil supply groove 81 of the blade 55 is filled with the lubricating oil J. The lubricating
oil J in the oil supply groove 81 is introduced between the sealing surfaces and the
respective flanges 62 and 72 to form an oil film therebetween. Therefore, in a state
in which direct contact with the flanges 62 and 72 is suppressed, the blade 55 advances
into and retreats from the cylinder chamber 46 in the radial direction in accordance
with the eccentric rotation of the roller 53.
[0056] FIG. 4 is an enlarged view of a portion IV of FIG. 1.
[0057] As shown in FIG. 4, a speed difference occurs between the blade 55 side and the flanges
62 and 72 sides in the lubricating oil J interposed between the blade 55 and the flanges
62 and 72 in the process of advancing and retreating the blade 55. When this speed
difference occurs, a shear force accompanied by viscosity acts on the lubricating
oil J. Particularly, since the inclined portion 83 is formed at the inner end in the
radial direction of the oil supply groove 81, in the latter half of the compression
stroke, a gap between the blade 55 and the flanges 62 and 72 becomes narrower toward
the rear in the movement direction of the blade 55 (arrow Q1 in FIG. 4). Therefore,
due to the viscous action of the lubricating oil J and the inclination of the inclined
portion 83, the lubricating oil J in the oil supply groove 81 is drawn to the inside
in the radial direction (a so-called wedge effect (arrow Q2 in FIG. 4)). Thereby,
since the lubricating oil J is introduced a space between the upper and lower end
surfaces of the blade 55 and the flanges 62 and 72 to the distal end surface side
of the blade 55, it is possible to effectively supply the lubricating oil J between
the blade 55 and the flanges 62 and 72.
[0058] On the other hand, since the outer end in the radial direction of the oil supply
groove 81 is opened through the straight extending portion 82, the above-described
wedge effect cannot easily occur in the operation region (hereinafter referred to
as a first half of the compression stroke) in which the blade 55 shifts from the top
dead center to the bottom dead center. Therefore, in the first half of the compression
stroke, the lubricating oil J cannot easily flow toward the inside in the radial direction
as compared with the latter half of the compression stroke. Thereby, it is possible
to prevent a large amount of the lubricating oil J in the oil supply groove 81 from
flowing into the distal end surface side of the blade 55 in the first half of the
compression stroke. Accordingly, excessive lubricating oil J interposed between the
blade 55 and the flanges 62 and 72 is prevented from flowing into the cylinder chamber
46, the refrigerant is prevented from flowing into the cylinder chamber 46 together
with the lubricating oil J, and thus degradation of compression performance can be
suppressed.
[0059] Here, the present embodiment is configured such that the surface roughness of the
bottom surface of the oil supply groove 81 is smaller than the surface roughness of
the back surface of the blade 55.
[0060] According to this configuration, it is possible to prevent foreign matter such as
abrasion powder floating in the lubricating oil J from being accumulated in the oil
supply groove 81 by being caught on unevenness of the bottom surface of the oil supply
groove 81 or the like. In addition, in the present embodiment, the inner end in the
radial direction of the oil supply groove 81 terminates within the blade 55 and the
outer end in the radial direction is opened to the outside of the cylinder chamber
46. Therefore, even when it is assumed that foreign matter enters the oil supply groove
81 together with the lubricating oil J, for example, in the latter half of the compression
stroke, the foreign matter in the oil supply groove 81 is easily discharged together
with the lubricating oil J through the outer end in the radial direction of the oil
supply groove 81 in accordance with the movement of the blade 55 toward the outside
in the radial direction. Thereby, it is possible to prevent an actual volume of the
oil supply groove 81 from being reduced and the oil supply groove 81 from being blocked
due to foreign matter. Therefore, since it is possible to continue to retain a desired
amount of the lubricating oil J in the oil supply groove 81, breakage of the oil film
between the blade 55 and the flanges 62 and 72 can be suppressed. As a result, since
direct contact between the blade 55 and the flanges 62 and 72 is suppressed and abrasion
therebetween can be reduced, operation reliability can be maintained over a long period
of time.
[0061] In addition, in the present embodiment, since the arc-shaped inclined portion 83
is formed at the inner end in the radial direction of the oil supply groove 81, the
above-described wedge effect may easily occur in the latter half of the compression
stroke. Thereby, the lubricating oil J is effectively supplied between the blade 55
(sealing surface) and the flanges 62 and 72 to a portion close to the distal end surface.
Therefore, it is possible to prevent the oil film between the blade 55 and the flanges
62 and 72 from being broken, and it is possible to further improve the operation reliability.
[0062] In addition, the present embodiment is configured such that the chamfered portions
75 and 76 are formed at the corners formed by the upper and lower end surfaces of
the blade 55 and the side surfaces of the blade 55 and at the corners formed by the
upper and lower end surfaces of the blade 55 and the inner side surfaces of the oil
supply grooves 81.
[0063] According to this configuration, generation of abrasion powder or the like due to
contact between the blade 55 and the flanges 62 and 72 can be suppressed. In addition,
since the chamfering amount L2 of the second chamfered portion 76 is larger than the
chamfering amount L1 of the first chamfered portion 75, the corners formed by the
upper and lower end surfaces of the blade 55 and the inner side surfaces of the oil
supply groove 81 can be reliably prevented from coming in contact with the flanges
62 and 72.
[0064] On the other hand, since the chamfering amount L1 of the first chamfered portion
75 is smaller than the chamfering amount of the second chamfered portion 76, it is
possible to prevent the lubricating oil J (the lubricating oil J of a discharge pressure)
positioned outside the cylinder chamber 46 from being introduced into the cylinder
chamber 46 through a gap between the first chamfered portion 75 and the flanges 62
and 72. Thereby, degradation of the compression performance can be suppressed.
[0065] Therefore, in the refrigeration cycle device 1 of the present embodiment, since the
rotary compressor 2 described above is provided, it is possible to provide a high-performance
and highly reliable refrigeration cycle device 1.
(Second embodiment)
[0066] FIG. 5 is a cross-sectional view of a blade 155 in a second embodiment corresponding
to FIG. 3.
[0067] In the blade 155 shown in FIG. 5, a connecting portion 101 for connecting an inner
side surface and a bottom surface is formed in an oil supply groove 181. The connecting
portion 101 bulges further outward in an axial direction than a connecting point P
(a corner formed by the inner side surface and the bottom surface) between a first
virtual line K1 which extends following an inner surface shape of the inner side surface
of the oil supply groove 181 and a second virtual line K2 which extends following
an inner surface shape of the bottom surface thereof. Specifically, the connecting
portion 101 is formed in an arc shape which is protrudes toward an inner side in the
axial direction in a longitudinal sectional view along the axial direction. The connecting
portion 101 is formed with a uniform radius of curvature over the entire length in
the radial direction of the oil supply groove 181. However, the connecting portion
101 may be formed in a portion in the radial direction of the oil supply groove 181.
Further, the connecting portion 101 may have a different radius of curvature depending
on a position in the radial direction.
[0068] An amount of bulging of the connecting portion 101 from the bottom surface of the
oil supply groove 181 is larger than the chamfering amount L1 of the first chamfered
portion 75 described above. In addition, when at least a portion of a flat surface
remains on the bottom surface of the oil supply groove 181 in a blade width direction,
dimensions of the connecting portion 101 (a radius of curvature, an amount of bulging
from the bottom surface, and the like) can be appropriately changed. In addition,
a shape in a longitudinal sectional view in the axial direction of the connecting
portion 101 is not limited to an arc shape and may be a straight line.
[0069] According to this configuration, in addition to achieving the same operation and
effect as the above-described embodiment, since the inner side surface and the bottom
surface of the oil supply groove 181 are smoothly continuous, accumulation of foreign
matter in the corner formed by the inner side surface and the bottom surface can be
suppressed.
[0070] In the above-described embodiment, the case in which the main bearing 42 and the
sub bearing 43 are used as the closing plates has been described, but the present
invention is not limited thereto. For example, in addition to closing an upper end
opening of the cylinder 41, a bearing through which the rotating shaft 31 is inserted
and a cylinder plate which slidably supports a lower end surface in the axial direction
of the rotating shaft 31 by closing a lower end opening of the cylinder 41 may be
used as the closing plate.
[0071] Although a configuration with one cylinder chamber 46 has been described in the above-described
embodiment, the present invention is not limited thereto, and a plurality of cylinder
chambers 46 may be provided.
[0072] Although the case in which the axial direction is aligned in a vertical direction
has been described in the above-described embodiment, the present invention is not
limited thereto, and the axial direction may be aligned in a horizontal direction.
[0073] Furthermore, although the case in which the roller 53 and the blade are separately
formed has been described in the above-described embodiment, the present invention
is not limited thereto, and the roller 53 and the blade may be integrally formed.
[0074] Also, although the case in which the oil supply grooves are individually formed on
the upper and lower end surfaces of the blade has been described in the above-described
embodiment, the present invention is not limited thereto, and a configuration in which
the oil supply groove is formed on at least one end surface may be employed.
[0075] Further, although the case in which one row of oil supply groove is formed on the
end surface of the blade has been described in the above-described embodiment, the
present invention is not limited thereto, and a plurality of rows of the oil supply
grooves may be formed.
[0076] In addition, although the case in which the inner end in the radial direction of
the oil supply groove is formed in an arc shape has been described in the above-described
embodiment, the present invention is not limited thereto, and the shape of the oil
supply groove can be appropriately changed in design. In this case, the cross-sectional
area of the oil supply groove may gradually decrease toward the distal end surface
of the blade, for example, to form the inner end in the radial direction of the oil
supply groove into a linear-shape or staircase-shape. In addition, throughout the
radial direction, the oil supply groove may gradually become shallow toward the distal
end surface of the blade. Further, the groove width of the oil supply groove may gradually
become small toward the distal end surface of the blade.
[0077] Also, the cross-sectional area of the oil supply groove may be uniform over the entire
radial direction.
[0078] Further, although the case in which the oil supply groove is formed in a linear shape
extending in the movement direction (radial direction) of the blade in a plan view
seen from the axial direction has been described in the above-described embodiment,
the present invention is not limited thereto. For example, if the oil supply groove
extends in the movement direction of the blade, the oil supply groove may, for example,
have a waveform or may be inclined with respect to the movement direction.
[0079] According to at least one embodiment described above, since the surface roughness
of the bottom surface of the oil supply groove is smaller than the surface roughness
of the back surface of the blade, it is possible to prevent foreign matter such as
abrasion powder floating in the lubricating oil from being accumulated in the oil
supply groove by being caught on unevenness of the bottom surface of the oil supply
groove or the like. Further, since the second end of the oil supply groove is terminated
within the blade, even when it is assumed that foreign matter enters the oil supply
groove together with the lubricating oil, for example, in the latter half of the compression
stroke, the foreign matter in the oil supply groove is easily discharged together
with the lubricating oil through the first end of the oil supply groove in accordance
with the movement of the blade toward the outside in the radial direction. Thereby,
it is possible to prevent an actual volume of the oil supply groove from being reduced
and the oil supply groove from being blocked due to foreign matter. Therefore, since
it is possible to continue to retain a desired amount of the lubricating oil in the
oil supply groove, breakage of the oil film between the blade and the flanges can
be suppressed. As a result, since direct contact between the blade and the flanges
is suppressed and abrasion therebetween can be reduced, operation reliability can
be maintained over a long period of time.
DESCRIPTION OF REFERENCE NUMERAL
[0080]
1 Refrigeration cycle device
2 Rotary compressor
3 Radiator
4 Expansion device
5 Evaporator
34 Sealed container (container)
41 Cylinder
42 Main bearing (closing plate)
43 Sub bearing (closing plate)
46 Cylinder chamber
53 Roller
55, 155 Blade
75 First chamfered portion
76 Second chamfered portion
81, 181 Oil supply groove
101 Connecting portion
L1 First chamfering amount
L2 Second chamfering amount
1. Drehkompressor (1), umfassend:
einen Behälter (34), in dem Schmieröl gespeichert ist;
einen Zylinder (41), der in dem Behälter (34) untergebracht ist;
eine Schließplatte (42, 43), die eine Öffnung des Zylinders (41) schließt und zusammen
mit dem Zylinder (41) eine Zylinderkammer (46) bildet;
eine Rolle (53), die sich exzentrisch in der Zylinderkammer (46) dreht;
eine Schaufel (55), die in einer in dem Zylinder (41) ausgebildeten Schaufelnut (54)
in Kontakt mit der Rolle (53) vorgesehen ist, um ein Inneres der Zylinderkammer (46)
zu teilen, und konfiguriert ist, dass sie entsprechend der exzentrischen Drehung der
Rolle (53) in den Zylinderraum (46) vorrücken und sich daraus zurückziehen kann; und
eine Ölzuführnut (81), die auf einer zugewandten Fläche der Schaufel (55), die der
Schließplatte (42, 43) zugewandt ist, gebildet und konfiguriert ist, um sich in einer
Bewegungsrichtung der Schaufel (55) zu erstrecken,
dadurch gekennzeichnet, dass
die Ölzuführnut (81) ein erstes Ende aufweist, das mit einer Innenseite des Behälters
(34) außerhalb der Zylinderkammer (46) in Verbindung steht, und ein zweites Ende,
das in der Schaufel (55) endet, und
die Oberflächenrauheit einer Bodenfläche der Ölzuführnut (81) kleiner ist als die
Oberflächenrauheit einer Rückfläche, die in der Nähe des ersten Endes in den Außenflächen
der Schaufel (55) angeordnet ist.
2. Drehkompressor (2) nach Anspruch 1, wobei mindestens ein Abschnitt der Ölzuführnut
(81), die in der Nähe des zweiten Endes angeordnet ist, eine Querschnittsfläche aufweist,
die zu einer distalen Endfläche der Schaufel (55) hin allmählich abnimmt.
3. Drehkompressor (2) nach Anspruch 2, wobei die Ölzuführnut (81) bogenförmig ausgebildet
ist, in der eine Nuttiefe von dem ersten Ende zu dem zweiten Ende hin allmählich abnimmt.
4. Drehkompressor (2) nach einem der Ansprüche 1 bis 3, wobei:
die Schaufel (55) aufweist:
einen ersten abgeschrägten Abschnitt (75), der an einer Ecke zwischen einer der Schaufelnut
(54) zugewandten Seitenfläche und der zugewandten Fläche ausgebildet ist; und
einen zweiten abgeschrägten Abschnitt (76), der an einer Ecke zwischen einer Innenseitenfläche
der Ölzuführnut (81) und der zugewandten Fläche ausgebildet ist, und einen
Abschrägungsbetrag, der eine Tiefe in einer Axialrichtung des Zylinders (41) von der
zugewandten Fläche in dem zweiten abgeschrägten Abschnitt (76) ist, der größer als
ein Abschrägungsbetrag ist, der die Tiefe in der Axialrichtung des Zylinders (41)
von der zugewandten Fläche in dem ersten abgeschrägten Abschnitt (75) ist.
5. Drehkompressor nach einem der Ansprüche 1 bis 4, wobei:
die Schaufel (155) aufweist:
einen Verbindungsabschnitt (101), der eine Innenseitenfläche und die Bodenfläche der
Ölzuführnut (181) verbindet und sich in Bezug auf die durch die Innenseitenfläche
und die Bodenfläche gebildete Ecke zur gegenüberliegenden Fläche hin ausbaucht; und
einen ersten abgeschrägten Abschnitt (75), der an einer Ecke zwischen einer der Schaufelnut
(54) zugewandten Seitenfläche und der zugewandten Fläche ausgebildet ist, und
ein Ausbauchungsbetrag (T), der eine Höhe in axialer Richtung des Zylinders (41) von
der Bodenfläche des Verbindungsabschnitts ist, der größer als ein Abschrägungsbetrag
ist, der eine Tiefe in axialer Richtung des Zylinders (41) von der zugewandten Fläche
in dem ersten abgeschrägten Abschnitt (75) ist.
6. Kühlkreislaufvorrichtung (1), umfassend:
einen Drehkompressor (2) nach einem der Ansprüche 1 bis 5;
einen Kühler (3), der mit dem Drehkompressor (2) verbunden ist;
eine Expansionsvorrichtung (4), die mit dem Kühler (3) verbunden ist; und
einen Verdampfer (5), der zwischen der Expansionsvorrichtung (4) und dem Drehkompressor
(2) verbunden ist.