Rotary compressor and refrigeration apparatus

Abstract

A housing (50) is provided with an elastic groove part (80), an elastic wall part (81), and a discharge passage (85). The elastic groove part (80) is positioned higher than an oil discharge hole (82), extends in the circumferential direction on the outer side, in the radial direction, of a main bearing (51), and opens upward. The elastic wall part (81) is erected between the main bearing (51) and the elastic groove part (80). The discharge passage (85) communicates with the oil discharge hole (82), extends in a position lower than the elastic wall part (81) so as to cross the elastic wall part (81), and opens to a predetermined discharge position on the outer side, in the radial direction, of the elastic wall part (81).

Description

Rotary compressor and refrigeration device

[0001] The present disclosure relates to a rotary compressor and a refrigeration device.

[0002] Patent Document 1 discloses a scroll compressor including a drive shaft that engages with an engaging portion of a movable scroll, and a housing having a main bearing (bearing portion) that supports the drive shaft and a housing portion that accommodates the engaging portion. An annular elastic groove portion is provided at the bottom of the housing portion, surrounding the entire circumference of the main bearing. A wall body between the inner circumferential surface of the elastic groove portion of the housing and the main bearing constitutes an elastic wall portion (inner circumferential wall).

[0003] Patent No. 5655850

[0004] In the invention of Patent Document 1, the main shaft portion (main journal portion) of the drive shaft is provided with a horizontal oil supply hole (branch passage) that leads to an oil supply passage (main passage) to lubricate the main bearing. If oil leaks from the lower end of the main bearing, the oil may be blown away by the flow of gas refrigerant caused by the rotation of the drive shaft, which could increase oil leakage.

[0005] Therefore, in order to prevent oil from leaking from the lower end of the main bearing, the inventors of the present application considered providing an oil drain passage between the outer surface of the main bearing and the inner surface of the elastic wall portion, and discharging the oil supplied between the drive shaft and the main bearing from the drain passage toward the accommodating portion.

[0006] However, if an oil discharge passage is provided in the elastic wall portion of the housing, the circumferential thickness of the elastic wall portion will be uneven, and if a load is applied to the main bearing as the drive shaft rotates, there is a risk that the amount of circumferential wear of the main bearing will vary.

[0007] An object of the present disclosure is to suppress variations in the amount of wear in the circumferential direction of a main bearing.

[0008] A first aspect of the present disclosure is a rotary compressor including a casing (20), a compression mechanism (40) accommodated in the casing (20), a drive shaft (11) that rotationally drives the compression mechanism (40), and a housing (50) having a main bearing (51) that rotatably supports the drive shaft (11), wherein the main bearing (51) is formed with an oil drain hole (82) that penetrates radially and drains oil supplied between the drive shaft (11) and the main bearing (51), and the housing The oil discharge passage (50) is provided with an elastic groove portion (80) that is arranged above the oil drain hole (82), extends circumferentially radially outward from the main bearing (51), and is open at the top, an elastic wall portion (81) that stands between the main bearing (51) and the elastic groove portion (80), and a discharge passage (85) that communicates with the oil drain hole (82), extends below the elastic wall portion (81) so as to cross the elastic wall portion (81), and opens at a predetermined discharge position radially outward from the elastic wall portion (81).

[0009] In the first aspect, by providing the discharge passage (85) at a position away from the elastic wall portion (81), it is possible to make the deformation rigidity of the elastic wall portion (81) more uniform in the circumferential direction than when the discharge passage (85) is provided in the elastic wall portion (81), thereby making it possible to suppress variations in the amount of wear in the circumferential direction of the main bearing (51).

[0010] A second aspect of the present disclosure is the rotary compressor of the first aspect, wherein the oil drain hole (82) includes a first oil drain hole (82a) and a second oil drain hole (82b) arranged circumferentially spaced apart from the first oil drain hole (82a), and the discharge passage (85) includes a first discharge passage (85a) communicating with the first oil drain hole (82a) and a second discharge passage (85b) communicating with the second oil drain hole (82b).

[0011] In the second aspect, by providing a first oil drain hole (82a) and a first discharge passage (85a), and a second oil drain hole (82b) and a second discharge passage (85b), the oil supplied to the main bearing (51) can be smoothly discharged to the discharge position.

[0012] A third aspect of the present disclosure is the rotary compressor of the first or second aspect, wherein the discharge passage (85) opens into a bottom surface of the elastic groove portion (80).

[0013] In the third aspect, the oil supplied to the main bearing (51) can be discharged from the discharge passage (85) to the bottom surface of the elastic groove (80).

[0014] In a fourth aspect of the present disclosure, in the rotary compressor of the first or second aspect, the discharge passage (85) is connected to a first oil passage (52) that returns oil from the inside of the housing (50) to the bottom of the casing (20).

[0015] In the fourth aspect, the oil supplied to the main bearing (51) can be returned to the bottom of the casing (20) by being discharged from the discharge passage (85) to the first oil passage (52).

[0016] A fifth aspect of the present disclosure is a rotary compressor according to any one of the first to fourth aspects, wherein the compression mechanism (40) has a fixed scroll (60) and a movable scroll (70) meshing with the fixed scroll (60), and the discharge passage (85) is connected to a second oil passage (55) that supplies oil to a sliding portion between the fixed scroll (60) and the movable scroll (70).

[0017] In the fifth aspect, the oil supplied to the main bearing (51) is discharged from the discharge passage (85) to the second oil passage (55), thereby lubricating the sliding parts between the fixed scroll (60) and the movable scroll (70).

[0018] A sixth aspect of the present disclosure is a rotary compressor according to any one of the first to fifth aspects, wherein a circumferential groove portion (17) extending in a circumferential direction is formed on an outer peripheral surface of the drive shaft (11), and the oil drain hole (82) is connected to the circumferential groove portion (17).

[0019] In the sixth aspect, by forming a circumferential groove portion (17) in the drive shaft (11), the oil supplied to the main bearing (51) is collected in the circumferential groove portion (17) and then discharged from the oil drain hole (82), thereby preventing oil from leaking out from below the main bearing (51).

[0020] A seventh aspect of the present disclosure is a refrigeration system including a rotary compressor (10) according to any one of the first to sixth aspects and a refrigerant circuit (1a) through which a refrigerant compressed by the rotary compressor (10) flows.

[0021] In the seventh aspect, a refrigeration system can be provided, which includes a rotary compressor (10) and a refrigerant circuit (1a).

[0022] Fig. 1 is a refrigerant circuit diagram showing the configuration of a refrigeration system of the first embodiment. Fig. 2 is a longitudinal sectional view showing the configuration of a scroll compressor. Fig. 3 is a longitudinal sectional view showing the configuration of an oil discharge passage. Fig. 4 is a longitudinal sectional view showing the configuration of an oil discharge passage according to the second embodiment. Fig. 5 is a longitudinal sectional view showing the configuration of an oil discharge passage according to the third embodiment. Fig. 6 is a longitudinal sectional view showing the configuration of an oil discharge passage according to the fourth embodiment. Fig. 7 is a longitudinal sectional view showing the configuration of an oil discharge passage according to the fifth embodiment.

[0023] First Embodiment As shown in Fig. 1, a rotary compressor (10) is provided in a refrigeration system (1). The refrigeration system (1) has a refrigerant circuit (1a) filled with a refrigerant. The refrigerant circuit (1a) has a rotary compressor (10), a radiator (3), a pressure reduction mechanism (4), and an evaporator (5). The pressure reduction mechanism (4) is, for example, an expansion valve. The refrigerant circuit (1a) performs a vapor compression refrigeration cycle.

[0024] The refrigeration system (1) is an air conditioning system. The air conditioning system may be a cooling-only system, a heating-only system, or an air conditioning system that switches between cooling and heating. In this case, the air conditioning system has a switching mechanism (e.g., a four-way switching valve) that switches the refrigerant circulation direction. The refrigeration system (1) may be a water heater, a chiller unit, a cooling system that cools the air inside a storage unit, or the like. The cooling system cools the air inside a refrigerator, a freezer, a container, or the like.

[0025] As shown in Fig. 2, the rotary compressor (10) includes a casing (20), a motor (30), and a compression mechanism (40). The casing (20) is formed in a vertically elongated cylindrical shape and configured as a sealed dome. The casing (20) accommodates the motor (30) and the compression mechanism (40). The motor (30) is disposed below the compression mechanism (40) and drives the compression mechanism (40) to rotate.

[0026] The motor (30) has a stator (31) and a rotor (32). The stator (31) is fixed to the inner peripheral surface of the casing (20). An oil return passage (35) that passes through the motor (30) in the axial direction is provided between the outer peripheral surface of the stator (31) and the inner peripheral surface of the casing (20).

[0027] Specifically, core cut portions (33) are formed continuously in the vertical direction on the outer peripheral surface of the stator (31). A plurality of core cut portions (33) are formed at intervals in the circumferential direction. One of the plurality of core cut portions (33) is used as an oil return passage (35) that returns oil discharged from a first oil passage (52) of the housing (50) (described later) to the oil reservoir (21).

[0028] The rotor (32) is disposed inside the stator (31). The drive shaft (11) passes through the rotor (32). The rotor (32) is fixed to the drive shaft (11).

[0029] An oil reservoir (21) is provided at the bottom of the casing (20). Oil is stored in the oil reservoir (21). A suction pipe (12) is connected to the top of the casing (20). A discharge pipe (13) is connected to the body of the casing (20).

[0030] A housing (50) is fixed to the casing (20). The housing (50) is disposed above the motor (30). A compression mechanism (40) is disposed above the housing (50). The inlet end of the discharge pipe (13) is located between the motor (30) and the housing (50).

[0031] A recess (53) is formed in the housing (50). The recess (53) is formed by recessing a portion of the upper surface of the housing (50). The main bearing (51) is provided below the recess (53). An elastic groove (80) is formed in the bottom surface of the recess (53). The elastic groove (80) is formed in a ring shape that extends circumferentially radially outward of the main bearing (51) and is open at the top.

[0032] The drive shaft (11) extends vertically along the axis of the casing (20). The drive shaft (11) has a main shaft portion (14) and an eccentric portion (15). The eccentric portion (15) is provided at the upper end of the main shaft portion (14).

[0033] An upper portion of the main shaft portion (14) passes through the housing (50) and is rotatably supported by a main bearing (51) of the housing (50). A lower portion of the main shaft portion (14) is rotatably supported by a lower bearing (26).

[0034] The lower bearing (26) is provided in a bearing body (27). The bearing body (27) is formed in a cylindrical shape extending in the vertical direction. The lower bearing (26) rotatably supports the main shaft (14). For example, a positive displacement pump (23) is provided in the bearing body (27).

[0035] The bearing body (27) is provided with a plurality of support legs (28). The support legs (28) protrude radially outward from the outer peripheral surface of the bearing body (27). For example, three support legs (28) are provided at intervals in the circumferential direction of the bearing body (27). The support legs (28) are fixed to the inner peripheral surface of the casing (20). An oil separation plate (29) is attached to the lower side of the support legs (28).

[0036] The compression mechanism (40) includes a fixed scroll (60) and a movable scroll (70). The fixed scroll (60) is fixed to the upper surface of the housing (50). The movable scroll (70) is disposed between the fixed scroll (60) and the housing (50).

[0037] The fixed scroll (60) has a fixed end plate (61), a fixed side wrap (62), and an outer peripheral wall (63). The outer peripheral wall (63) is formed in a substantially cylindrical shape. The outer peripheral wall (63) stands on the outer edge of the front surface (the lower surface in FIG. 2 ) of the fixed end plate (61).

[0038] The fixed side wrap (62) is formed in a spiral shape and is provided upright inside the outer peripheral wall (63) of the fixed side end plate (61).

[0039] The fixed side end plate (61) is located on the outer periphery side and is formed continuously with the fixed side wrap (62). The tip end surface of the fixed side wrap (62) and the tip end surface of the outer periphery wall (63) are formed to be substantially flush with each other. The fixed scroll (60) is fixed to the housing (50).

[0040] The movable scroll (70) has a movable end plate (71), a movable wrap (72), and a boss portion (73). The movable wrap (72) is formed in a spiral shape. The movable wrap (72) is formed on the upper surface of the movable end plate (71). The movable wrap (72) meshes with the fixed wrap (62).

[0041] The boss portion (73) is formed at the center of the lower surface of the movable end plate (71). The eccentric portion (15) of the drive shaft (11) is inserted into the boss portion (73) to couple the drive shaft (11).

[0042] The compression mechanism (40) has a fluid chamber (S) into which the refrigerant flows. The fluid chamber (S) is formed between a fixed scroll (60) and a movable scroll (70). The movable scroll (70) is disposed such that the movable wrap (72) meshes with the fixed wrap (62) of the fixed scroll (60).

[0043] An intake port (64) is formed in the outer peripheral wall (63) of the fixed scroll (60). The intake port (64) opens near the end of the fixed side wrap (62). The downstream end of the intake pipe (12) is connected to the intake port (64).

[0044] A discharge port (65) is formed in the center of the fixed end plate (61) of the fixed scroll (60). The discharge port (65) opens in the upper surface of the fixed end plate (61) of the fixed scroll (60). High-pressure gas refrigerant discharged from the discharge port (65) flows through a passage (not shown) formed in the housing (50) into the upper space (24) below the housing (50) and above the motor (30).

[0045] An oil supply passage (16) is formed inside the drive shaft (11). The oil supply passage (16) extends vertically from the lower end to the upper end of the drive shaft (11). The lower end of the drive shaft (11) is connected to a pump (23). The lower end of the pump (23) is immersed in the oil reservoir (21). As the drive shaft (11) rotates, the pump (23) draws up oil from the oil reservoir (21) and transfers it to the oil supply passage (16).

[0046] The oil supply passage (16) supplies oil from the oil reservoir (21) to the sliding surface between the lower bearing (26) and the drive shaft (11), the sliding surface between the main bearing (51) and the drive shaft (11), and also to the sliding surface between the boss portion (73) and the drive shaft (11). The oil supply passage (16) opens to the upper end surface of the drive shaft (11) and supplies oil above the drive shaft (11).

[0047] The oil supplied to the boss (73) flows out into the recess (53) of the housing (50) through a gap between the eccentric portion (15) of the drive shaft (11) and the boss (73). When high-pressure oil is supplied to the recess (53), a high pressure corresponding to the discharge pressure of the compression mechanism (40) acts on the recess (53). The high pressure of the recess (53) presses the movable scroll (70) against the fixed scroll (60).

[0048] The housing (50) is provided with a first oil passage (52). The first oil passage (52) is a passage for discharging oil that has flowed into the recess (53) to the outside of the housing (50). The upstream end of the first oil passage (52) communicates with the recess (53). An oil return member (56) is disposed downstream of the first oil passage (52).

[0049] The oil return member (56) guides downward the oil discharged from the recess (53) toward the first oil passage (52). A guide plate (57) is disposed below the oil return member (56).

[0050] The guide plate (57) guides the oil discharged from the oil return member (56) to the oil return passage (35) of the motor (30). The guide plate (57) is formed of a plate material bent in a tapered shape, with the opening width narrowing from top to bottom. The lower part of the oil return member (56) is inserted into the upper part of the guide plate (57). The lower part of the guide plate (57) extends so as to pass through the gap between the casing (20) and the coil part of the motor (30) and the gap in the oil return passage (35).

[0051] A second oil passage (55) is formed inside the housing (50) and the fixed scroll (60). The second oil passage (55) supplies oil to the sliding portion between the fixed scroll (60) and the movable scroll (70).

[0052] Specifically, the inflow end of the second oil passage (55) communicates with an elastic groove (80) formed in the bottom surface of the recess (53). The outflow end of the second oil passage (55) opens to the opposing surface of the fixed scroll (60). The second oil passage (55) supplies high-pressure oil in the recess (53) to the opposing surface between the movable end plate (71) of the movable scroll (70) and the outer peripheral wall (63) of the fixed scroll (60).

[0053] <Oil Drain Passage> After being supplied to the boss portion (73), the oil accumulates in the recess (53) of the housing (50) and is discharged through the first oil passage (52) or the second oil passage (55). The main shaft portion (14) of the drive shaft (11) is provided with a horizontal oil supply hole (not shown) that communicates with the oil supply passage (16) and lubricates the main bearing (51). If oil leaks from the lower end of the main bearing (51), the oil may be blown away by the flow of gas refrigerant caused by the rotation of the drive shaft (11), which may increase the amount of oil leakage.

[0054] Therefore, in this embodiment, in order to prevent oil from leaking from the lower end of the main bearing (51), a discharge passage (85) is provided to discharge the oil supplied between the drive shaft (11) and the main bearing (51) to a predetermined discharge position.

[0055] Specifically, as shown in Fig. 3, an oil drain hole (82) is formed in the main bearing (51). The oil drain hole (82) penetrates the main bearing (51) in the radial direction. The oil drain hole (82) discharges oil supplied between the drive shaft (11) and the main bearing (51) to the outside of the main bearing (51). The oil drain hole (82) includes a first oil drain hole (82a) and a second oil drain hole (82b). The second oil drain hole (82b) is disposed circumferentially spaced apart from the first oil drain hole (82a).

[0056] The housing (50) is provided with an elastic groove portion (80), an elastic wall portion (81), and a discharge passage (85). The elastic groove portion (80) is formed in the bottom surface of the recess (53). The elastic groove portion (80) is formed in a ring shape that extends circumferentially radially outward from the main bearing (51) and is open at the top. The elastic groove portion (80) is located above the oil discharge hole (82). The elastic wall portion (81) is formed by a wall that stands between the main bearing (51) and the elastic groove portion (80).

[0057] The discharge passage (85) communicates with the oil discharge hole (82), extends below the elastic wall portion (81) and across the elastic wall portion (81), and opens at a predetermined discharge position radially outward from the elastic wall portion (81).

[0058] In the example shown in Fig. 3, the discharge passage (85) extends horizontally from a position communicating with the oil drain hole (82) and then extends vertically. The discharge passage (85) opens at the bottom surface of the elastic groove portion (80).

[0059] The discharge passage (85) includes a first discharge passage (85a) and a second discharge passage (85b). The first discharge passage (85a) communicates with the first oil drain hole (82a). The second discharge passage (85b) communicates with the second oil drain hole (82b).

[0060] Although the present embodiment has been described with reference to a configuration in which two oil drain holes (82) and two discharge passages (85) are provided, the present invention is not limited to this. For example, a configuration in which only one oil drain hole (82) and one discharge passage (85) are provided may be used. Alternatively, a configuration in which three or more oil drain holes (82) and three or more discharge passages (85) are provided may be used.

[0061] A circumferential groove (17) extending in the circumferential direction is formed on the outer peripheral surface of the drive shaft (11). The circumferential groove (17) collects oil flowing between the drive shaft (11) and the main bearing (51) before it leaks out from the lower end of the main bearing (51). The oil drain hole (82) communicates with the circumferential groove (17). The oil collected in the circumferential groove (17) passes through the oil drain hole (82), the discharge passage (85), and the elastic groove (80) in this order due to a pressure difference, and is returned to the recess (53).

[0062] Advantages of First Embodiment According to the present embodiment, by providing the discharge passage (85) at a position away from the elastic wall portion (81), it is possible to make the deformation rigidity of the elastic wall portion (81) more uniform in the circumferential direction than when the discharge passage (85) is provided in the elastic wall portion (81). This makes it possible to reduce variations in the amount of wear in the circumferential direction of the main bearing (51).

[0063] According to this embodiment, by providing the first oil drain hole (82a) and the first discharge passage (85a), and the second oil drain hole (82b) and the second discharge passage (85b), the oil supplied to the main bearing (51) can be smoothly discharged to the discharge position.

[0064] According to this embodiment, the oil supplied to the main bearing (51) can be discharged through the discharge passage (85) to the bottom surface of the elastic groove (80).

[0065] According to this embodiment, by forming a circumferential groove portion (17) in the drive shaft (11), the oil supplied to the main bearing (51) is collected in the circumferential groove portion (17) and then discharged from the oil drain hole (82), thereby preventing oil from leaking out from below the main bearing (51).

[0066] According to the present embodiment, a refrigeration system (1) is provided, which includes a rotary compressor (10) and a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows. This makes it possible to provide a refrigeration system (1) including the rotary compressor (10) and the refrigerant circuit (1a).

[0067] Second Embodiment Hereinafter, the same parts as those in the first embodiment will be denoted by the same reference numerals, and only the differences will be described.

[0068] 4, the housing (50) is provided with an elastic groove (80), an elastic wall (81), and a discharge passage (85). The discharge passage (85) communicates with the oil drain hole (82), extends below the elastic wall (81) and across the elastic wall (81), and opens at a predetermined discharge position radially outward from the elastic wall (81).

[0069] In the example shown in Fig. 4, the discharge passage (85) extends horizontally from a position communicating with the oil drain hole (82) and then extends vertically. The discharge passage (85) opens at the bottom surface of the elastic groove portion (80).

[0070] Here, the discharge passage (85) is formed by drilling a hole in the housing (50) with a drill (not shown). Specifically, the horizontally extending passage of the discharge passage (85) is formed by inserting a drill horizontally from the outside of the housing (50). On the other hand, the vertically extending passage of the discharge passage (85) is formed by inserting a drill from above the housing (50) toward the bottom surface of the elastic groove portion (80). Thereafter, the opening that opens radially outward of the housing (50) is closed with a plug member (86). In this way, the discharge passage (85) that communicates with the oil drain hole (82) and the elastic groove portion (80) can be formed.

[0071] 5, the housing (50) is provided with an elastic groove (80), an elastic wall (81), and a discharge passage (85). The discharge passage (85) communicates with the oil drain hole (82), extends below the elastic wall (81) and across the elastic wall (81), and opens at a predetermined discharge position radially outward from the elastic wall (81).

[0072] 5, the discharge passage (85) extends obliquely upward from a position communicating with the oil drain hole (82) and then extends vertically. The discharge passage (85) opens at the bottom surface of the elastic groove portion (80).

[0073] Here, the discharge passage (85) is formed by drilling a hole in the housing (50) with a drill (not shown). Specifically, the passage extending diagonally upward in the discharge passage (85) is formed by inserting a drill diagonally upward through a hole in the housing (50) into which the main bearing (51) is fitted. On the other hand, the passage extending vertically in the discharge passage (85) is formed by inserting a drill from above the housing (50) toward the bottom surface of the elastic groove portion (80). In this way, the discharge passage (85) communicating with the oil drain hole (82) and the elastic groove portion (80) can be formed.

[0074] 6, the housing (50) is provided with an elastic groove (80), an elastic wall (81), and a discharge passage (85). The discharge passage (85) communicates with the oil drain hole (82), extends below the elastic wall (81) and across the elastic wall (81), and opens at a predetermined discharge position radially outward from the elastic wall (81).

[0075] 6, the discharge passage (85) extends obliquely upward from a position where it communicates with the oil drain hole (82) and communicates with the first oil passage (52). The oil collected in the circumferential groove (17) of the drive shaft (11) passes through the oil drain hole (82), the discharge passage (85), the first oil passage (52), and the oil return member (56) in this order due to the pressure difference, and is discharged to the outside of the housing (50).

[0076] -Effects of embodiment 4- According to this embodiment, the oil supplied to the main bearing (51) can be discharged from the discharge passage (85) to the first oil passage (52), thereby returning the oil to the bottom of the casing (20).

[0077] 7 , the housing (50) is provided with an elastic groove (80), an elastic wall (81), and a discharge passage (85). The discharge passage (85) communicates with the oil drain hole (82), extends below the elastic wall (81) and across the elastic wall (81), and opens at a predetermined discharge position radially outward from the elastic wall (81).

[0078] 7, the discharge passage (85) extends obliquely upward from a position communicating with the oil drain hole (82) and communicates with the second oil passage (55). The oil recovered in the circumferential groove portion (17) of the drive shaft (11) passes through the oil drain hole (82), the discharge passage (85), and the second oil passage (55) in this order due to the pressure difference, and is supplied to the sliding portion between the fixed scroll (60) and the movable scroll (70).

[0079] 7 illustrates a configuration in which the discharge passage (85) is in communication with the second oil passage (55), but the present invention is not limited to this. For example, two discharge passages (85) may be provided, one of which is in communication with the first oil passage (52) and the other is in communication with the second oil passage (55).

[0080] -Effects of embodiment 5- According to this embodiment, the oil supplied to the main bearing (51) is discharged from the discharge passage (85) to the second oil passage (55), thereby lubricating the sliding parts between the fixed scroll (60) and the movable scroll (70).

[0081] Other Embodiments Although the embodiments and modifications have been described above, it will be understood that various modifications in form and detail are possible without departing from the spirit and scope of the claims. Furthermore, elements of the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate. Furthermore, the terms "first," "second," "third," etc. in the specification and claims are used to distinguish between terms to which these terms are attached, and do not limit the number or order of those terms.

[0082] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for rotary compressors and refrigeration devices.

[0083] REFRIGERATION SYSTEM 1a REFRIGERATOR CIRCUIT 10 ROTARY COMPRESSOR 11 DRIVE SHAFT 17 CIRCUMFERENCE GROOVE 20 CASING 40 COMPRESSION MECHANISM 50 HOUSING 51 MAIN BEARING 52 FIRST OIL PASSAGE 55 SECOND OIL PASSAGE 60 FIXED SCROLL 70 MOVING SCROLL 80 ELASTIC GROOVE 81 ELASTIC WALL 82 OIL DRAIN HOLE 82a FIRST OIL DRAIN HOLE 82b SECOND OIL DRAIN HOLE 85 DISCHARGE PASSAGE 85a FIRST DISCHARGE PASSAGE 85b SECOND DISCHARGE PASSAGE

Claims

1. A rotary compressor comprising: a casing (20); a compression mechanism (40) accommodated in the casing (20); a drive shaft (11) that rotationally drives the compression mechanism (40); and a housing (50) having a main bearing (51) that rotatably supports the drive shaft (11), wherein the main bearing (51) is formed with an oil drain hole (82) that penetrates radially and drains oil supplied between the drive shaft (11) and the main bearing (51), and the housing (50) is provided with: an elastic groove portion (80) that is arranged above the oil drain hole (82), extends circumferentially radially outward of the main bearing (51), and is open at the top; and an elastic wall portion (81) that stands between the main bearing (51) and the elastic groove portion (80), a discharge passage (85) that communicates with the oil drain hole (82), extends below the elastic wall portion (81) so as to cross the elastic wall portion (81), and opens at a predetermined discharge position radially outward from the elastic wall portion (81).

2. A rotary compressor according to claim 1, wherein the oil drain hole (82) includes a first oil drain hole (82a) and a second oil drain hole (82b) circumferentially spaced apart from the first oil drain hole (82a), and the discharge passage (85) includes a first discharge passage (85a) communicating with the first oil drain hole (82a) and a second discharge passage (85b) communicating with the second oil drain hole (82b).

3. The rotary compressor according to claim 1 or 2, wherein the discharge passage (85) opens to the bottom surface of the elastic groove portion (80).

4. The rotary compressor according to claim 1 or 2, wherein the discharge passage (85) communicates with a first oil passage (52) that returns oil from the inside of the housing (50) to the bottom of the casing (20).

5. A rotary compressor according to any one of claims 1 to 4, wherein the compression mechanism (40) has a fixed scroll (60) and a movable scroll (70) meshing with the fixed scroll (60), and the discharge passage (85) communicates with a second oil passage (55) that supplies oil to a sliding portion between the fixed scroll (60) and the movable scroll (70).

6. A rotary compressor according to any one of claims 1 to 5, wherein a circumferential groove (17) extending in the circumferential direction is formed on the outer peripheral surface of the drive shaft (11), and the oil drain hole (82) communicates with the circumferential groove (17).

7. A refrigeration system comprising: a rotary compressor (10) according to any one of claims 1 to 6; and a refrigerant circuit (1a) through which refrigerant compressed by the rotary compressor (10) flows.

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