Rotary compressor and refrigerating device

Abstract

To restrain air bubbles from occurring in oil stored in a bottom part of a casing.SOLUTION: An oil return passage (35) penetrates in the axial direction between an outer peripheral surface of a motor (30) and an inner peripheral surface of a casing (20). Oil moving toward a bottom part of the casing (20) after being discharged from an oil discharge passage (52) of a housing (50) passes through the oil return passage (35). A guide member (80) is arranged below the motor (30). The guide member (80) comprises an inclined part (81) extending so as to be inclined obliquely downward. The inclined part (81) is arranged so as to cover the oil return passage (35) as viewed from the axial direction of the motor (30).SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a high-pressure dome type rotary compressor in which high-pressure refrigerant compressed by a compression mechanism is discharged into a casing, creating high pressure inside the casing.

[0003] In the rotary compressor of Patent Document 1, oil is pumped up from an oil reservoir at the bottom of the casing, discharged through an oil discharge passage in the housing, then discharged into a first space below the motor and returned to the oil reservoir. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-005060 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if the oil that has been discharged from the oil drain passage flows forcefully down toward the oil reservoir at the bottom of the casing, the oil surface in the oil reservoir will be disturbed, causing air bubbles to form in the oil, which may deteriorate the lubricity of the oil.

[0006] The object of the present disclosure is to suppress the formation of air bubbles in the oil stored at the bottom of the casing. [Means for solving the problem]

[0007] A first aspect of the present disclosure is a rotary compressor including: a casing (20) having an oil reservoir (21) at its bottom; a compression mechanism (40) accommodated in the casing (20); a drive shaft (11) that rotationally drives the compression mechanism (40); and a motor (30) that is disposed below the compression mechanism (40) and rotates the drive shaft (11). The rotary compressor further includes a housing (50) that is disposed between the compression mechanism (40) and the motor (30), and a guide member (80) that is disposed below the motor (30). The drive shaft (11) is provided with an oil supply passage (16) that draws up oil from the oil reservoir (21). is provided with a recess (53) through which oil sucked up from the oil supply passage (16) flows out, and an oil drain passage (52) through which the oil that has flowed into the recess (53) is discharged to the outside of the housing (50), and the motor (30) is provided with an oil return passage (35) that penetrates in the axial direction between the outer peripheral surface of the motor (30) and the inner peripheral surface of the casing (20) and through which oil that has been discharged from the oil drain passage (52) and is heading toward the bottom of the casing (20) passes, and the guide member (80) has an inclined portion (81) that extends obliquely downward, and the inclined portion (81) is positioned so as to cover the oil return passage (35) when viewed in the axial direction of the motor (30).

[0008] In the first aspect, the oil that has passed through the oil return passage (35) of the motor (30) is temporarily received by the inclined portion (81) and then flows along the inclined portion (81), thereby allowing the oil to be slowly returned to the oil reservoir (21) at the bottom of the casing (20). This reduces the risk of air bubbles being generated in the oil due to disturbances in the oil surface in the oil reservoir (21), which would deteriorate the lubricity of the oil.

[0009] In a second aspect of the present disclosure, in the rotary compressor of the first aspect, the guide member (80) has a peripheral wall portion (83) extending along the inner wall surface of the casing (20), and the inclined portion (81) extends obliquely downward from the peripheral edge portion of the peripheral wall portion (83).

[0010] In the second aspect, the guide member (80) has a configuration including the peripheral wall portion (83) and the inclined portion (81), thereby increasing the rigidity of the guide member (80).

[0011] A third aspect of the present disclosure is the rotary compressor of the first or second aspect, wherein the inclined portion (81) is formed in a flat plate shape with a constant inclination angle.

[0012] In the third embodiment, the oil can flow slowly along the inclined surface of the inclined portion (81) toward the oil reservoir (21).

[0013] A fourth aspect of the present disclosure is the rotary compressor of the first or second aspect, wherein the inclined portion (81) is formed in a curved shape that protrudes downward.

[0014] In the fourth embodiment, the oil can flow slowly along the curved surface of the inclined portion (81) toward the oil reservoir (21).

[0015] A fifth aspect of the present disclosure is the rotary compressor of any one of the first to fourth aspects, wherein the inclined portion (81) is inclined obliquely downward toward the inside in the radial direction of the casing (20).

[0016] In the fifth embodiment, the inclined portion (81) allows oil to flow toward the center in the radial direction of the bottom of the casing (20).

[0017] A sixth aspect of the present disclosure is the rotary compressor of any one of the first to fourth aspects, wherein the inclined portion (81) is inclined obliquely downward along the circumferential direction of the casing (20).

[0018] In the sixth aspect, the inclined portion (81) allows the oil to flow slowly toward the oil reservoir (21) while circulating along the inner circumferential surface of the casing (20).

[0019] A seventh aspect of the present disclosure is a rotary compressor according to any one of the first to sixth aspects, wherein an oil separation plate (90) is arranged between the motor (30) and the inclined portion (81), and the oil separation plate (90) overlaps the inclined portion (81) at a position downstream in the oil flow direction from a portion of the inclined portion (81) that covers the oil return passage (35), as viewed in the axial direction of the motor (30).

[0020] In the seventh aspect, even if oil passes through the oil return passage (35) of the motor (30) and hits the inclined portion (81) and splashes, the splashed oil adheres to the lower surface of the oil separation plate (90), making it easier to return the oil to the oil reservoir (21).

[0021] An eighth aspect of the present disclosure is the rotary compressor of any one of the first to seventh aspects, wherein the inclined portion (81) is attached to the casing (20).

[0022] In the eighth embodiment, the inclined portion (81) can be firmly fixed to the casing (20) by welding or the like.

[0023] A ninth aspect of the present disclosure is the rotary compressor of any one of the first to seventh aspects, wherein an oil separation plate (90) is provided between a bottom of the casing (20) and the motor (30), and the inclined portion (81) is provided on the oil separation plate (90).

[0024] In the ninth aspect, the inclined portion (81) can be positioned relative to the oil separation plate (90), and the assembling operations of the oil separation plate (90) and the assembling operations of the inclined portion (81) can be performed simultaneously.

[0025] A tenth aspect of the present disclosure is a rotary compressor according to any one of the first to ninth aspects, wherein the angle θ formed between the inner wall surface of the casing (20) and a tangent line passing through the lower end of the inclined portion (81) when viewed in the radial direction of the casing (20) satisfies the condition 30°≦θ≦45°.

[0026] In the tenth aspect, by appropriately setting the inclination angle of the inclined portion (81), oil can flow smoothly along the inclined portion (81).

[0027] An eleventh aspect of the present disclosure is a refrigeration system including the rotary compressor (10) of any one of the first to tenth aspects and a refrigerant circuit (1a) through which a refrigerant compressed by the rotary compressor (10) flows.

[0028] In an eleventh aspect, a refrigeration system including a rotary compressor (10) and a refrigerant circuit (1a) can be provided. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a refrigerant circuit diagram showing the configuration of the refrigeration device of the first embodiment. [Figure 2] FIG. 2 is a vertical cross-sectional view showing the configuration of the rotary compressor. [Figure 3] FIG. 3 is a vertical cross-sectional view showing the configuration of the guide member. [Figure 4] FIG. 4 is a vertical cross-sectional view showing the configuration of a guide member according to the second embodiment. [Figure 5] FIG. 5 is a perspective view showing the configuration of the guide member. [Figure 6] FIG. 6 is a vertical cross-sectional view showing the configuration of a guide member according to the third embodiment. [Figure 7] FIG. 7 is a vertical cross-sectional view showing the configuration of a guide member and an oil separation plate according to the fourth embodiment. [Figure 8] FIG. 8 is a perspective view showing the configuration of the guide member and the oil separation plate. [Figure 9] FIG. 9 is a perspective view showing the configuration of a guide member and an oil separation plate according to the fifth embodiment. [Figure 10] FIG. 10 is a perspective view showing the configuration of a guide member and an oil separation plate according to the sixth embodiment. [Figure 11] FIG. 11 is a perspective view showing the state before the guide member integrally formed with the oil separation plate is assembled. [Figure 12]FIG. 12 is a cross-sectional view showing the configuration of a guide member according to the seventh embodiment. [Figure 13] FIG. 13 is a perspective view showing the configuration of the guide member. DETAILED DESCRIPTION OF THE INVENTION

[0030] First Embodiment As shown in Fig. 1, the 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 the 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.

[0031] The refrigeration system (1) is an air conditioner. The air conditioner may be a cooling-only unit, a heating-only unit, or an air conditioner that switches between cooling and heating. In this case, the air conditioner 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 device that cools the air inside a storage unit, or the like. A cooling device cools the air inside a refrigerator, a freezer, a container, or the like.

[0032] 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 is 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.

[0033] 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).

[0034] 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 an oil discharge passage (52) of the housing (50), which will be described later, to the oil reservoir (21).

[0035] 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).

[0036] 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).

[0037] A housing (50) is fixed to the casing (20). The housing (50) is disposed above the motor (30). The 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).

[0038] The housing 50 has a recess 53 formed therein. The recess 53 is formed by recessing a portion of the upper surface of the housing 50. An upper bearing 51 is provided below the recess 53.

[0039] 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).

[0040] An upper portion of the main shaft portion (14) passes through the housing (50) and is rotatably supported by an upper bearing (51) of the housing (50). A lower portion of the main shaft portion (14) is rotatably supported by a lower bearing (26).

[0041] 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).

[0042] 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). A communication passage (29) is provided between adjacent support legs (28). The communication passage (29) connects the lower space (25) below the motor (30) with the oil reservoir (21).

[0043] An oil separation plate (90) is disposed between the oil reservoir (21) at the bottom of the casing (20) and the motor (30). The oil separation plate (90) is attached to the upper or lower side of the support legs (28). The oil separation plate (90) is disposed so as to block two of the three communication passages (29) provided between the three support legs (28). The oil lubricated in the compression mechanism (40) returns to the oil reservoir (21) through the communication passages (29) that are not blocked by the oil separation plate (90).

[0044] 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).

[0045] 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).

[0046] The fixed side wrap (62) is formed in a spiral shape and stands inside the outer peripheral wall (63) of the fixed side end plate (61).

[0047] The fixed scroll end plate (61) is located on the outer periphery and is formed continuously with the fixed scroll wrap (62). The tip end surface of the fixed scroll 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).

[0048] The movable scroll (70) has a movable end plate (71), a movable lap (72), and a boss portion (73). The movable lap (72) is formed in a spiral shape. The movable lap (72) is formed on the upper surface of the movable end plate (71). The movable lap (72) meshes with the fixed lap (62).

[0049] 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, and the drive shaft 11 is connected to the boss portion 73.

[0050] 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 a movable wrap (72) meshes with a fixed wrap (62) of the fixed scroll (60).

[0051] 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).

[0052] 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). The 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).

[0053] 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 delivers it to the oil supply passage (16).

[0054] 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 upper 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).

[0055] The oil supplied to the boss (73) flows 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).

[0056] An oil passage (55) is formed inside the housing (50) and the fixed scroll (60). An inlet end of the oil passage (55) communicates with the recess (53) of the housing (50). An outlet end of the oil passage (55) opens to the opposing surface of the fixed scroll (60). The 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).

[0057] The housing (50) is provided with an oil drain passage (52). The oil drain passage (52) is a passage for draining oil that has flowed into the recess (53) to the outside of the housing (50). The upstream end of the oil drain passage (52) communicates with the recess (53). An oil return member (56) is provided downstream of the oil drain passage (52).

[0058] The oil return member (56) guides downward the oil discharged from the recess (53) toward the oil discharge passage (52). A guide plate (57) is provided below the oil return member (56).

[0059] 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 tapered plate material whose opening width narrows 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).

[0060] <Oil return operation> However, if the oil discharged from the oil drain passage (52) of the housing (50) passes through the return passage (35) and flows forcefully down toward the oil reservoir (21) at the bottom of the casing (20), the oil surface in the oil reservoir (21) will be disturbed, which may cause air bubbles to form in the oil and deteriorate the lubricity of the oil.

[0061] Therefore, in this embodiment, the oil that has passed through the oil return passage (35) of the motor (30) can be slowly returned to the oil reservoir (21) at the bottom of the casing (20).

[0062] Specifically, as shown in Fig. 3, a guide member (80) is disposed below the motor (30). The guide member (80) has an inclined portion (81) and a fixed portion (82). The inclined portion (81) and the fixed portion (82) are formed, for example, by bending a single plate material.

[0063] The fixed portion (82) is fixed to the inner wall surface of the casing (20) by welding or the like. The inclined portion (81) extends obliquely downward from the lower edge of the fixed portion (82). Specifically, the inclined portion (81) is inclined obliquely downward toward the radially inner side of the casing (20).

[0064] The inclined portion (81) is formed in the shape of a flat plate with a constant inclination angle. Specifically, when viewed in the radial direction of the casing (20), the angle θ formed by the inner wall surface of the casing (20) and a tangent passing through the lower end of the inclined portion (81) satisfies the condition 30°≦θ≦45°. When viewed in the axial direction of the motor (30), the inclined portion (81) is positioned so as to cover the oil return passage (35) of the motor (30).

[0065] In Figure 3, the flow of oil is indicated by arrows. Oil flowing toward the bottom of the casing (20) passes through the oil return passage (35). The oil that has passed through the oil return passage (35) collides with the inclined portion (81). The oil that has collided with the inclined portion (81) flows along the inclined surface of the inclined portion (81) toward the oil reservoir (21).

[0066] The oil separation plate (90) is disposed between the motor (30) and the inclined portion (81). When viewed in the axial direction of the motor (30), the oil separation plate (90) overlaps the inclined portion (81) at a position downstream in the oil flow direction from the portion of the inclined portion (81) that covers the oil return passage (35).

[0067] -Effects of the first embodiment- According to the features of this embodiment, the oil that has passed through the oil return passage (35) of the motor (30) is temporarily received by the inclined portion (81) and then flows along the inclined portion (81), thereby allowing the oil to be slowly returned to the oil reservoir (21) at the bottom of the casing (20). This reduces the risk of air bubbles being generated in the oil due to disturbances in the oil surface in the oil reservoir (21), which would deteriorate the lubricity of the oil.

[0068] According to the feature of this embodiment, oil can be made to flow slowly along the inclined surface of the inclined portion (81) toward the oil reservoir (21).

[0069] According to the feature of this embodiment, the inclined portion (81) allows oil to flow toward the center of the bottom of the casing (20) in the radial direction.

[0070] According to the features of this embodiment, even if oil passes through the oil return passage (35) of the motor (30) and hits the inclined portion (81) and splashes, the splashed oil adheres to the lower surface of the oil separation plate (90), making it easier to return the oil to the oil reservoir (21).

[0071] According to the feature of this embodiment, the inclined portion (81) can be firmly fixed to the casing (20) by welding or the like.

[0072] According to the feature of this embodiment, by appropriately setting the inclination angle of the inclined portion (81), oil can flow smoothly along the inclined portion (81).

[0073] According to a feature of the present embodiment, a refrigeration system (1) 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).

[0074] 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.

[0075] 4 and 5, the guide member (80) has an inclined portion (81) and a peripheral wall portion (83). The peripheral wall portion (83) extends along the inner wall surface of the casing (20). In the example shown in Fig. 5, the peripheral wall portion (83) extends around the entire inner wall surface of the casing (20).

[0076] Note that the upper edge of the peripheral wall 83 may be partially cut out to avoid interference with the support legs 28. Specifically, since three support legs 28 are provided at intervals in the circumferential direction, three cutouts may be formed at intervals in the circumferential direction in the upper edge of the peripheral wall 83 at positions corresponding to the support legs 28.

[0077] The inclined portion (81) extends obliquely downward from the peripheral edge of the peripheral wall portion (83). In the example shown in Fig. 5, the inclined portion (81) extends around the entire peripheral edge of the peripheral wall portion (83).

[0078] The inclined portion (81) is formed in the shape of a flat plate with a constant inclination angle. In the example shown in Fig. 5, the inclined portion (81) extends obliquely downward from the lower edge of the peripheral wall portion (83). The inclined portion (81) may also be configured to extend obliquely downward from the upper edge of the peripheral wall portion (83). The inclined portion (81) is positioned so as to cover the oil return passage (35) of the motor (30) when viewed in the axial direction of the motor (30).

[0079] -Effects of the second embodiment- According to the feature of this embodiment, the guide member (80) has the peripheral wall portion (83) and the inclined portion (81), thereby increasing the rigidity of the guide member (80).

[0080] Third Embodiment As shown in Fig. 6, the guide member (80) has a peripheral wall portion (83) and an inclined portion (81). The peripheral wall portion (83) extends along the inner wall surface of the casing (20). In the example shown in Fig. 6, the peripheral wall portion (83) extends around the entire inner wall surface of the casing (20).

[0081] The inclined portion (81) extends obliquely downward from the peripheral edge of the peripheral wall portion (83). In the example shown in Fig. 6, the inclined portion (81) extends around the entire peripheral edge of the peripheral wall portion (83).

[0082] The inclined portion (81) is formed in a curved shape that protrudes downward. In the example shown in Fig. 6, the inclined portion (81) extends obliquely downward from the lower edge of the peripheral wall portion (83). The inclined portion (81) may also be configured to extend obliquely downward from the upper edge of the peripheral wall portion (83). The inclined portion (81) is positioned so as to cover the oil return passage (35) of the motor (30) when viewed in the axial direction of the motor (30).

[0083] -Effects of the third embodiment- According to the feature of this embodiment, oil can flow slowly along the curved surface of the inclined portion (81) toward the oil reservoir (21).

[0084] Fourth Embodiment As shown in Fig. 7, an oil separation plate (90) is provided between the bottom of the casing (20) and the motor (30). As also shown in Fig. 8, a guide member (80) is provided on the oil separation plate (90). The guide member (80) has an inclined portion (81), a fixed portion (82), and a connecting portion (84).

[0085] The fixed portion (82) is fixed to the inner wall surface of the casing (20) by welding or the like. The inclined portion (81) extends obliquely downward from the lower edge of the fixed portion (82). Specifically, the inclined portion (81) is inclined obliquely downward toward the radially inner side of the casing (20). The inclined portion (81) is disposed so as to cover the oil return passage (35) of the motor (30) when viewed in the axial direction of the motor (30).

[0086] The connecting portion (84) connects the outer peripheral edge of the oil separation plate (90) to the downstream end of the inclined portion (81). The oil separation plate (90), the connecting portion (84), the inclined portion (81), and the fixing portion (82) are formed by bending a single plate material.

[0087] A passage hole (85) is formed in the connecting portion (84). After passing through the oil return passage (35), the oil collides with the inclined portion (81), flows along the inclined surface of the inclined portion (81), passes through the passage hole (85), and heads toward the oil reservoir (21).

[0088] -Effects of the fourth embodiment- According to the feature of this embodiment, the inclined portion (81) can be positioned relative to the oil separation plate (90), and the assembling operations of the oil separation plate (90) and the assembling operations of the inclined portion (81) can be performed simultaneously.

[0089] Fifth Embodiment As shown in Fig. 9, an opening (86) is formed in the oil separation plate (90). Oil that has flowed down from the oil return passage (35) passes through the opening (86). The guide member (80) is provided on the oil separation plate (90). The guide member (80) has an inclined portion (81), a fixed portion (82), and a connecting portion (84).

[0090] The fixed portion (82) is fixed to the inner wall surface of the casing (20) by welding or the like. The inclined portion (81) extends obliquely downward from the lower edge of the fixed portion (82). Specifically, the inclined portion (81) is inclined obliquely downward toward the radially inner side of the casing (20). The inclined portion (81) is disposed so as to cover the oil return passage (35) of the motor (30) when viewed in the axial direction of the motor (30).

[0091] The connecting portion (84) connects the inner peripheral edge of the opening (86) of the oil separation plate (90) to the downstream end of the inclined portion (81). The oil separation plate (90), the connecting portion (84), the inclined portion (81), and the fixing portion (82) are formed by bending a single plate material.

[0092] A passage hole (85) is formed in the connecting portion (84). After passing through the oil return passage (35), the oil collides with the inclined portion (81), flows along the inclined surface of the inclined portion (81), passes through the passage hole (85), and heads toward the oil reservoir (21).

[0093] -Effects of the fifth embodiment- According to the feature of this embodiment, the inclined portion (81) can be positioned relative to the oil separation plate (90), and the assembling operations of the oil separation plate (90) and the assembling operations of the inclined portion (81) can be performed simultaneously.

[0094] Sixth Embodiment As shown in Figure 10, the oil separation plate (90) has an opening (86) formed therein. Oil that has flowed down from the oil return passage (35) passes through the opening (86). The guide member (80) is provided on the oil separation plate (90). The guide member (80) has an inclined portion (81) and a connecting portion (84).

[0095] 11 , the oil separation plate (90), the inclined portion (81), and the connecting portion (84) are formed by bending a single plate material. Specifically, a pair of slits (87) are formed in the oil separation plate (90). Between the pair of slits (87), portions that will become the inclined portion (81) and the connecting portion (84) after bending extend so as to protrude radially inward of the oil separation plate (90).

[0096] Here, the inclined portion (81) and the connecting portion (84) are bent in the direction indicated by the imaginary arrow line in Fig. 11. Thereafter, as shown in Fig. 10, the oil separation plate (90) and the connecting portion (84) are welded to form a welded portion (88) in a state in which the upper edge of the connecting portion (84) is fitted into a cutout portion of the oil separation plate (90) formed between the pair of slits (87) by bending the inclined portion (81).

[0097] The inclined portion (81) is inclined obliquely downward toward the inside in the radial direction of the casing (20). The inclined portion (81) is disposed so as to cover the oil return passage (35) of the motor (30) when viewed in the axial direction of the motor (30).

[0098] The connecting portion (84) connects the peripheral edge of the opening hole (86) of the oil separation plate (90) to the downstream end of the inclined portion (81). A passage hole (85) is formed in the connecting portion (84). After passing through the oil return passage (35), the oil collides with the inclined portion (81), flows along the inclined surface of the inclined portion (81), passes through the passage hole (85), and heads toward the oil reservoir (21).

[0099] -Effects of the sixth embodiment- According to the features of this embodiment, it is possible to position the inclined portion (81) relative to the oil separation plate (90), and to simultaneously assemble the oil separation plate (90) and the inclined portion (81). Furthermore, in this embodiment, the guide member (80) is configured without the fixing portion (82), which eliminates the need for welding the inclined portion (81) to the casing (20), thereby reducing the number of labor hours.

[0100] Seventh Embodiment As shown in Figures 12 and 13, the guide member (80) has an inclined portion (81). For ease of understanding, members other than the guide member (80), such as the lower bearing (26) and the oil separation plate (90), are not shown in Figures 12 and 13.

[0101] The inclined portion (81) extends along the inner wall surface of the casing (20) when viewed in the axial direction of the casing (20). The inclined portion (81) is inclined obliquely downward along the circumferential direction of the casing (20). When viewed in the axial direction of the motor (30), the inclined portion (81) is positioned so as to cover the oil return passage (35) of the motor (30).

[0102] The oil that has passed through the oil return passage (35) collides with the inclined portion (81), and then flows along the inclined surface of the inclined portion (81) toward the oil reservoir portion (21) while circling the inner peripheral surface of the casing (20).

[0103] -Effects of the seventh embodiment- According to the feature of this embodiment, the inclined portion (81) allows the oil to flow slowly toward the oil reservoir (21) while circulating along the inner circumferential surface of the casing (20).

[0104] 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. [Industrial Applicability]

[0105] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for rotary compressors and refrigeration devices. [Explanation of symbols]

[0106] 1 Refrigeration equipment 1a Refrigerant circuit 10 Rotary Compressor 11 Drive shaft 16 Fuel Line 20 Casing 21 Oil reservoir 30 motor 35 Oil return passage 40 Compression mechanism 50 Housing 52 Oil drain passage 53 Recess 80 Guide member 81 Slope 83 Peripheral wall section 90 Oil separation plate

Claims

1. A rotary compressor including: a casing (20) having an oil reservoir (21) at its bottom; a compression mechanism (40) accommodated in the casing (20); a drive shaft (11) that rotationally drives the compression mechanism (40); and a motor (30) that is disposed below the compression mechanism (40) and rotates the drive shaft (11), a housing (50) disposed between the compression mechanism (40) and the motor (30); a guide member (80) disposed below the motor (30), The drive shaft (11) is provided with an oil supply passage (16) that draws up oil from the oil reservoir (21), The housing (50) is provided with a recess (53) through which oil sucked up from the oil supply passage (16) flows out, and an oil drain passage (52) through which the oil flowing out into the recess (53) is discharged to the outside of the housing (50), The motor (30) is provided with an oil return passage (35) that penetrates in the axial direction between an outer peripheral surface of the motor (30) and an inner peripheral surface of the casing (20) and through which oil that has been discharged from the oil discharge passage (52) and is heading toward the bottom of the casing (20) passes, The guide member (80) has an inclined portion (81) extending obliquely downward, The inclined portion (81) is disposed so as to cover the oil return passage (35) when viewed in the axial direction of the motor (30). Rotary compressor.

2. 2. The rotary compressor of claim 1, The guide member (80) has a peripheral wall portion (83) extending along the inner wall surface of the casing (20), The inclined portion (81) extends obliquely downward from the peripheral edge of the peripheral wall portion (83). Rotary compressor.

3. The rotary compressor according to claim 1 or 2, The inclined portion (81) is formed in the shape of a flat plate with a constant inclination angle. Rotary compressor.

4. The rotary compressor according to claim 1 or 2, The inclined portion (81) is formed in a curved shape that protrudes downward. Rotary compressor.

5. The rotary compressor according to claim 1 or 2, The inclined portion (81) is inclined obliquely downward toward the radially inner side of the casing (20). Rotary compressor.

6. The rotary compressor according to claim 1 or 2, The inclined portion (81) is inclined obliquely downward along the circumferential direction of the casing (20). Rotary compressor.

7. The rotary compressor according to claim 1 or 2, an oil separation plate (90) is disposed between the motor (30) and the inclined portion (81); The oil separation plate (90) overlaps the inclined portion (81) at a position downstream in the oil flow direction of the portion of the inclined portion (81) that covers the oil return passage (35), as viewed in the axial direction of the motor (30). Rotary compressor.

8. The rotary compressor according to claim 1 or 2, The inclined portion (81) is attached to the casing (20). Rotary compressor.

9. The rotary compressor according to claim 1 or 2, an oil separation plate (90) is provided between the bottom of the casing (20) and the motor (30); The inclined portion (81) is provided on the oil separation plate (90). Rotary compressor.

10. The rotary compressor according to claim 1 or 2, When viewed from the radial direction of the casing (20), the angle θ formed by the inner wall surface of the casing (20) and a tangent line passing through the lower end of the inclined portion (81) satisfies the condition: 30°≦θ≦45°. Rotary compressor.

11. A rotary compressor (10) according to claim 1 or 2; a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows. Refrigeration equipment.

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