Scroll compressor and refrigeration device

Abstract

There is a possibility that lubrication failure may occur in the sliding portion between the Oldham joint and the movable scroll. 【Solution means】The scroll compressor 101 includes a fixed scroll 24, a movable scroll 26, and an Oldham joint 39. The Oldham joint 39 has an annular main body portion 39a and a second key portion 39c. A fixed-side oil groove 80 is provided on the first thrust surface 24e that slides with the movable-side mirror plate 26a on the outer peripheral wall 24c of the fixed scroll 24. An oil passage 24f for supplying oil to the fixed-side oil groove 80 is provided in the fixed scroll 24. A movable-side key groove 26d on which the second key portion 39c slides during the rotation of the movable scroll 26 is provided on the lower surface 26g of the movable-side mirror plate 26a. An oil hole 26i that communicates the movable-side key groove 26d with the second thrust surface 26e on the side opposite to the lower surface 26g is provided in the movable-side mirror plate 26a. The fixed-side oil groove 80 communicates with the oil hole 26i in a predetermined section of the angular region where the movable scroll 26 rotates.

Description

Technical Field

[0001] It relates to a scroll compressor and a refrigeration device.

Background Art

[0002] Conventionally, a scroll compressor equipped with an Oldham coupling for suppressing the rotation of a movable scroll during rotation has been used. Further, as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2014-070598), a scroll compressor in which key grooves in which keys of the Oldham coupling slide are formed in a fixed scroll and a movable scroll is known.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In the scroll compressor of Patent Document 1 (Japanese Patent Application Laid-Open No. 2014-070598), a passage for supplying lubricating oil to the key groove of the fixed scroll is provided in the fixed scroll. However, this scroll compressor does not have a mechanism for supplying lubricating oil to the key groove of the movable scroll. Further, since the key groove of the movable scroll opens downward, lubricating oil easily flows down from the key groove. Therefore, there is a possibility that poor lubrication may occur in the sliding portion between the Oldham coupling and the movable scroll.

Means for Solving the Problems

[0004] The scroll compressor of the first aspect includes a fixed scroll, a movable scroll, and an Oldham coupling. The fixed scroll has a first mirror plate, an outer peripheral wall erected at the outer edge of the first mirror plate, and a spiral first wrap erected on the first mirror plate inside the outer peripheral wall. The movable scroll has a second mirror plate and a spiral second wrap erected on the second mirror plate. The Oldham coupling has an annular main body and a key erected on the main body. The Oldham coupling is configured to suppress the rotation of the movable scroll during its rotation. On the first surface of the outer peripheral wall that slides with the second mirror plate, a first oil groove extending in the circumferential direction is provided. In the fixed scroll, an oil passage is provided that communicates with the first oil groove and supplies oil to the first oil groove. On the third surface of the second mirror plate, which is opposite to the second surface that slides with the outer peripheral wall, a key groove is provided through which the key slides during the rotation of the movable scroll. In the second mirror plate, an oil hole is provided that communicates the key groove with the second surface. The first oil groove communicates with the oil hole in a predetermined section of the angular region where the movable scroll rotates.

[0005] The scroll compressor of the first aspect can suppress the occurrence of poor lubrication in the sliding portion between the Oldham coupling and the movable scroll.

[0006] The scroll compressor of the second aspect is the scroll compressor of the first aspect, and on the third surface, a pair of key grooves including a first key groove and a second key groove are provided. In the second mirror plate, a first oil hole that is an oil hole communicating with the first key groove and a second oil hole that is an oil hole communicating with the second key groove are provided.

[0007] The scroll compressor of the second aspect can suppress the occurrence of poor lubrication in the sliding portion between the Oldham coupling and the movable scroll.

[0008] The scroll compressor from the third perspective is the scroll compressor from the second perspective, and the stationary scroll is further provided with a suction port that opens near the end of winding of the first wrap. The stationary scroll and the movable scroll form a first compression chamber formed outside the second wrap and a second compression chamber formed inside the second wrap and communicating with the suction port. The second surface is provided with a second oil groove and a third oil groove. The second oil groove communicates with the first oil groove and the first compression chamber during the rotation of the movable scroll. The third oil groove communicates with the first oil groove and the second compression chamber during the rotation of the movable scroll.

[0009] The scroll compressor from the third perspective can suppress the leakage of refrigerant from the compression chamber.

[0010] The scroll compressor from the fourth perspective is the scroll compressor from the third perspective, and the first oil groove communicates with the first oil hole in the first section of the angular region where the movable scroll rotates. The first oil groove communicates with the second oil hole in the second section of the angular region where the movable scroll rotates. The first oil groove communicates with the first compression chamber through the second oil groove in the third section of the angular region where the movable scroll rotates. The first oil groove communicates with the second compression chamber through the third oil groove in the fourth section of the angular region where the movable scroll rotates. The first section, the second section, the third section, and the fourth section do not overlap with each other.

[0011] The scroll compressor from the fourth perspective can suppress a decrease in the supply amount of lubricating oil to the key groove of the movable scroll.

[0012] The scroll compressor from the fifth perspective is any one of the scroll compressors from the first to the fourth perspectives, and the second surface is further provided with a fourth oil groove communicating with the oil hole. The first oil groove communicates with the oil hole through the fourth oil groove in a predetermined section of the angular region where the movable scroll rotates.

[0013] The scroll compressor from the fifth perspective can suppress the occurrence of poor lubrication in the sliding part between the Oldham coupling and the movable scroll.

[0014] The scroll compressor according to the sixth aspect is the scroll compressor according to the fifth aspect, and the fourth oil groove has an extension portion extending in the circumferential direction.

[0015] The scroll compressor according to the sixth aspect can promote the supply of lubricating oil to the sliding portion between the fixed scroll and the movable scroll.

[0016] The refrigeration device according to the seventh aspect includes any one of the scroll compressors according to the first to sixth aspects and a refrigerant circuit through which the refrigerant compressed by the scroll compressor flows.

[0017] The refrigeration device according to the seventh aspect can suppress seizure between the Oldham coupling and the movable scroll and improve reliability.

Brief Description of the Drawings

[0018]

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Mode for Carrying Out the Invention

[0019] <First Embodiment> (1) Overall Configuration As shown in FIG. 1, the scroll compressor 101 is provided in the refrigeration device 1. The refrigeration device 1 is, for example, an air conditioner. The refrigeration device 1 includes a refrigerant circuit 100 filled with a refrigerant. The refrigerant circuit 100 has a scroll compressor 101, a radiator 2, a decompression mechanism 3, and an absorber 4. The radiator 2 and the absorber 4 are heat exchangers. The decompression mechanism 3 is, for example, an expansion valve. The refrigerant circuit 100 performs a vapor compression refrigeration cycle.

[0020] The refrigerant filled in the refrigerant circuit 100 is selected from the group consisting of, for example, R410A, R1234yf, R1234ze, R290, R1270, R32, and carbon dioxide.

[0021] As shown in FIG. 2, the scroll compressor 101 includes a casing 10, a compression mechanism 15, a housing 23, an Oldham coupling 39, a motor 16, a lower bearing 60, a crankshaft 17, a suction pipe 19, and a discharge pipe 20.

[0022] (1-1) Casing 10 The casing 10 has a cylindrical body casing portion 11, a bowl-shaped upper wall portion 12, and a bowl-shaped bottom wall portion 13. The upper wall portion 12 is airtightly welded to the upper end portion of the body casing portion 11. The bottom wall portion 13 is airtightly welded to the lower end portion of the body casing portion 11. The casing 10 is arranged such that the longitudinal direction of the body casing portion 11 is along the vertical direction.

[0023] Inside the casing 10, the compression mechanism 15, the housing 23, the Oldham coupling 39, the motor 16, the lower bearing 60, and the crankshaft 17 are accommodated. The suction pipe 19 and the discharge pipe 20 are airtightly welded to the casing 10.

[0024] At the bottom of the internal space of the casing 10, an oil sump portion 10a, which is a space for storing lubricating oil, is formed. The lubricating oil is a refrigeration machine oil used to maintain good lubricity of the compression mechanism 15, the crankshaft 17, etc. during the operation of the scroll compressor 101. When the refrigerant is carbon dioxide, the pressure in the internal space of the casing 10 becomes high, and the force of contact between the members of the sliding portion of the scroll compressor 101 increases. Therefore, it is preferable to actively supply lubricating oil to the sliding portion.

[0025] (1-2) Compression mechanism 15 The compression mechanism 15 sucks and compresses a low-temperature and low-pressure refrigerant gas and discharges a high-temperature and high-pressure refrigerant gas (hereinafter referred to as "compressed refrigerant"). The compression mechanism 15 has a fixed scroll 24 and a movable scroll 26. The fixed scroll 24 is fixed to the inner peripheral surface of the casing 10. The movable scroll 26 performs a turning motion turning with respect to the fixed scroll 24.

[0026] As shown in FIG. 3, the fixed scroll 24 has a fixed-side mirror plate 24a, a fixed-side wrap 24b, and an outer peripheral wall 24c. The fixed-side mirror plate 24a has a disc shape. The fixed-side wrap 24b has a spiral shape when viewed along the vertical direction. The outer peripheral wall 24c has a cylindrical shape when viewed along the vertical direction. The outer peripheral wall 24c is provided at the outer edge portion of the lower surface of the fixed-side mirror plate 24a. The fixed-side wrap 24b is provided on the lower surface of the fixed-side mirror plate 24a inside the outer peripheral wall 24c. The fixed-side wrap 24b extends from the start of winding located at the central portion of the fixed-side mirror plate 24a toward the end of winding connected to the outer peripheral wall 24c when viewed along the vertical direction. Two fixed-side key grooves 24g are formed on the lower surface of the outer peripheral wall 24c.

[0027] As shown in FIG. 4, the movable scroll 26 has a movable-side mirror plate 26a, a movable-side wrap 26b, and an upper end bearing 26c. The movable-side mirror plate 26a has a disc shape. The movable-side wrap 26b has a spiral shape when viewed along the vertical direction. The upper end bearing 26c has a cylindrical shape. The movable-side wrap 26b is provided on the upper surface of the movable-side mirror plate 26a. The upper end bearing 26c is provided at the central portion of the lower surface 26g of the movable-side mirror plate 26a. The movable-side wrap 26b extends from the start of winding located at the central portion of the movable-side mirror plate 26a toward the end of winding located outside the movable-side mirror plate 26a when viewed along the vertical direction. Two movable-side key grooves 26d are formed on the lower surface 26g of the movable-side mirror plate 26a.

[0028] The compression mechanism 15 forms a compression chamber 40. The compression chamber 40 is formed between the fixed scroll 24 and the movable scroll 26. The fixed scroll 24 and the movable scroll 26 are arranged such that the fixed-side wrap 24b and the movable-side wrap 26b mesh with each other. The lower surface of the outer peripheral wall 24c of the fixed scroll 24 faces the movable scroll 26. The upper surface of the movable-side mirror plate 26a of the movable scroll 26 faces the fixed scroll 24. While the movable scroll 26 is rotating, the lower surface of the outer peripheral wall 24c slides on the upper surface of the movable-side mirror plate 26a.

[0029] An intake port 24d is formed in the fixed scroll 24. The intake port 24d opens near the end of winding of the fixed-side wrap 24b. The downstream end of the intake pipe 19 is connected to the intake port 24d. The intake port 24d communicates with the compression chamber 40.

[0030] On the upper surface of the fixed-side end plate 24a of the fixed scroll 24, an enlarged recess 42 which is a cylindrical depression is formed. The enlarged recess 42 is covered with a cover member 44. A discharge hole 41 is formed in the bottom surface of the enlarged recess 42. The discharge hole 41 is provided at the center of the fixed-side end plate 24a. The discharge hole 41 is a hole penetrating the fixed-side end plate 24a in the vertical direction. The discharge hole 41 communicates the compression chamber 40 and the enlarged recess 42.

[0031] A first refrigerant flow path (not shown) is formed in the fixed-side end plate 24a and the outer peripheral wall 24c. The first refrigerant flow path communicates with the enlarged recess 42. The first refrigerant flow path communicates with the second refrigerant flow path of the housing 23 on the lower surface of the outer peripheral wall 24c.

[0032] As shown in FIG. 3, on the lower surface of the outer peripheral wall 24c of the fixed scroll 24, a first thrust surface 24e that slides on the upper surface of the movable-side end plate 26a, a fixed-side oil groove 80 is formed. The fixed-side oil groove 80 extends in the circumferential direction of the fixed scroll 24. The circumferential direction of the fixed scroll 24 is the direction along the inner peripheral surface of the outer peripheral wall 24c. At least a part of the fixed-side oil groove 80 has an arc shape.

[0033] An oil passage 24f for supplying oil to the fixed-side oil groove 80 is formed in the fixed scroll 24. The oil passage 24f is formed inside the outer peripheral wall 24c. One end of the oil passage 24f opens inside the fixed-side oil groove 80 and communicates with the fixed-side oil groove 80. The other end of the oil passage 24f opens on the lower surface of the outer peripheral wall 24c and communicates with the housing oil supply passage 23c of the housing 23.

[0034] On the outer peripheral wall 24c of the fixed scroll 24, a first communication passage 24h is formed. The first communication passage 24h is a groove formed on the lower surface of the outer peripheral wall 24c. The inner end of the first communication passage 24h opens to the inner peripheral surface of the outer peripheral wall 24c and communicates with the compression chamber 40. The first communication passage 24h is provided at a position communicating with the compression chamber 40 in an intermediate pressure state. The pressure in the compression chamber 40 in the intermediate pressure state is higher than the pressure of the refrigerant before compression and lower than the pressure of the compressed refrigerant.

[0035] On the outer peripheral portion of the movable side mirror plate 26a of the movable scroll 26, a second communication passage 26h is formed. The second communication passage 26h is a hole penetrating the movable side mirror plate 26a in the vertical direction. During the rotation of the movable scroll 26, the upper end of the second communication passage 26h intermittently communicates with the first communication passage 24h. The lower end of the second communication passage 26h communicates with an intermediate pressure space 72 to be described later.

[0036] (1 - 3) Housing 23 The housing 23 is disposed below the compression mechanism 15 and above the motor 16. The outer peripheral surface of the housing 23 is hermetically joined to the inner peripheral surface of the body casing portion 11. The internal space of the casing 10 is partitioned into a high pressure space 71, an intermediate pressure space 72, and a low pressure space 73. The high pressure space 71 is the space below the housing 23. The intermediate pressure space 72 is the space above the housing 23 and is the space surrounded by the housing 23, the fixed scroll 24, and the movable scroll 26. The low pressure space 73 is the space above the housing 23 and above the fixed scroll 24.

[0037] The intermediate pressure space 72 communicates with the compression chamber 40 in an intermediate pressure state via the first communication passage 24h and the second communication passage 26h. Therefore, the pressure in the intermediate pressure space 72 is lower than the pressure in the high pressure space 71. Due to the pressures of the refrigerant in the high pressure space 71 and the intermediate pressure space 72, the movable scroll 26 during rotation is pressed against the fixed scroll 24. The pressure in the intermediate pressure space 72 is higher than the pressure in the low pressure space 73.

[0038] The housing 23 mounts the fixed scroll 24 and sandwiches the movable scroll 26 together with the fixed scroll 24. A second refrigerant flow path (not shown) is formed in the outer peripheral portion of the housing 23. The second refrigerant flow path is a hole that vertically penetrates the outer peripheral portion of the housing 23. The second refrigerant flow path communicates with the first refrigerant flow path of the fixed scroll 24 on the upper surface of the housing 23. The second refrigerant flow path communicates with the high-pressure space 71 on the lower surface of the housing 23. Therefore, the compression chamber 40 of the compression mechanism 15 communicates with the high-pressure space 71 via the discharge hole 41, the enlarged recess 42, the first refrigerant flow path of the fixed scroll 24, and the second refrigerant flow path of the housing 23.

[0039] A depression called a crank chamber 23a is formed on the upper surface of the housing 23. A housing through hole 31 is formed in the housing 23. The housing through hole 31 is a hole that vertically penetrates the housing 23 from the central portion of the bottom surface of the crank chamber 23a to the central portion of the lower surface of the housing 23. Hereinafter, a part of the housing 23 and the portion around the housing through hole 31 are referred to as an upper bearing 32. An annular groove 23g is formed on the outer peripheral portion of the bottom surface of the crank chamber 23a.

[0040] An oil discharge passage 23b that communicates the crank chamber 23a and the high-pressure space 71 is formed in the housing 23. In the crank chamber 23a, the opening of the oil discharge passage 23b is formed near the bottom surface of the crank chamber 23a.

[0041] A housing oil supply passage 23c for supplying lubricating oil to the compression mechanism 15 is formed in the housing 23. One end of the housing oil supply passage 23c opens into the annular groove 23g. The other end of the housing oil supply passage 23c opens to the outer peripheral portion of the upper surface of the housing 23 and communicates with the oil passage 24f of the fixed scroll 24. A throttle mechanism (not shown) for reducing the pressure of the lubricating oil flowing through the housing oil supply passage 23c is disposed inside the housing oil supply passage 23c.

[0042] (1-4) Oldham coupling 39 The Oldham coupling 39 is a member for suppressing the rotation of the rotating movable scroll 26. The Oldham coupling 39 is disposed between the movable scroll 26 and the housing 23 in the intermediate pressure space 72.

[0043] As shown in FIG. 5, the Oldham coupling 39 has an annular main body portion 39a, a pair of first key portions 39b, and a pair of second key portions 39c. The first key portion 39b and the second key portion 39c are portions protruding from the upper surface of the annular main body portion 39a. The first key portion 39b is disposed inside the fixed-side key groove 24g of the fixed scroll 24. The second key portion 39c is disposed inside the movable-side key groove 26d of the movable scroll 26. While the movable scroll 26 is rotating, the first key portion 39b reciprocates along the longitudinal direction of the fixed-side key groove 24g inside the fixed-side key groove 24g. While the movable scroll 26 is rotating, the second key portion 39c reciprocates along the longitudinal direction of the movable-side key groove 26d inside the movable-side key groove 26d. Thereby, the rotation of the rotating movable scroll 26 is suppressed.

[0044] (1-5) Motor 16 The motor 16 is disposed below the housing 23. The motor 16 has a stator 51 and a rotor 52.

[0045] The stator 51 has a stator core 51a and a plurality of coils 51b. The stator core 51a is a cylindrical member fixed to the inner peripheral surface of the casing 10. The stator core 51a has a plurality of teeth (not shown). The coils 51b are formed by winding wires around the teeth.

[0046] A plurality of core cuts are formed on the outer peripheral surface of the stator core 51a. The core cuts are grooves formed in the vertical direction from the upper end surface to the lower end surface of the stator core 51a.

[0047] The rotor 52 is a cylindrical member disposed inside the stator core 51a. An air gap is formed between the inner peripheral surface of the stator core 51a and the outer peripheral surface of the rotor 52. The rotor 52 is connected to the crankshaft 17. The rotor 52 is connected to the compression mechanism 15 via the crankshaft 17. The rotor 52 rotates the crankshaft 17 around the rotation axis 16a. The rotation axis 16a passes through the central axis of the rotor 52.

[0048] The motor 16 functions as a power source for compressing the gas refrigerant in the compression chamber 40 by swinging the movable scroll 26 through the rotation of the crankshaft 17.

[0049] (1-6) Lower bearing 60 The lower bearing 60 is disposed below the motor 16. The outer peripheral surface of the lower bearing 60 is joined to the inner peripheral surface of the casing 10. The lower bearing 60 rotatably supports the crankshaft 17.

[0050] (1-7) Crankshaft 17 The crankshaft 17 is arranged such that its axial direction is along the vertical direction. The axis of the upper end portion of the crankshaft 17 is eccentric with respect to the axis of the portion excluding the upper end portion. The crankshaft 17 has a balance weight 18. The balance weight 18 is fixed in close contact with the crankshaft 17 at a height position below the housing 23 and above the motor 16.

[0051] The crankshaft 17 vertically penetrates the rotation center portion of the rotor 52 and is connected to the rotor 52. The upper end portion of the crankshaft 17 is fitted into the upper end bearing 26c of the movable scroll 26. Thereby, since the crankshaft 17 is connected to the movable scroll 26, the rotation of the crankshaft 17 is transmitted to the movable scroll 26. The crankshaft 17 is rotatably supported by the upper bearing 32 and the lower bearing 60.

[0052] Inside the crankshaft 17, a main oil supply passage 61 is formed. The main oil supply passage 61 extends along the axial direction (vertical direction) of the crankshaft 17. The upper end of the main oil supply passage 61 communicates with an oil chamber 83, which is a space between the upper end surface of the crankshaft 17 and the lower surface 26g of the movable-side mirror plate 26a. The lower end of the main oil supply passage 61 communicates with an oil sump portion 10a.

[0053] The crankshaft 17 has a first sub-oil supply passage 61a, a second sub-oil supply passage 61b, and a third sub-oil supply passage 61c that branch off from the main oil supply passage 61. The first sub-oil supply passage 61a, the second sub-oil supply passage 61b, and the third sub-oil supply passage 61c extend in the horizontal direction. The first sub-oil supply passage 61a opens at a sliding portion between the crankshaft 17 and the upper end bearing 26c of the movable scroll 26. The second sub-oil supply passage 61b opens at a sliding portion between the crankshaft 17 and the upper bearing 32 of the housing 23. The third sub-oil supply passage 61c opens at a sliding portion between the crankshaft 17 and the lower bearing 60.

[0054] (1-8) Suction pipe 19 The suction pipe 19 is a pipe for introducing the refrigerant of the refrigerant circuit from outside the casing 10 to the compression mechanism 15. The suction pipe 19 penetrates the upper wall portion 12 of the casing 10. Inside the casing 10, the end of the suction pipe 19 is fitted into the suction port 24d of the fixed scroll 24.

[0055] (1-9) Discharge pipe 20 The discharge pipe 20 is a pipe for discharging the compressed refrigerant from the high-pressure space 71 to the outside of the casing 10. The discharge pipe 20 penetrates the body casing portion 11 of the casing 10. Inside the casing 10, the end of the discharge pipe 20 is located in the high-pressure space 71 above the motor 16 and below the housing 23.

[0056] (2) Operation of the scroll compressor 101 When the motor 16 is driven, the crankshaft 17 connected to the rotor 52 of the motor 16 rotates. Due to the rotational motion of the crankshaft 17, the movable scroll 26 pivots around the rotation axis 16a of the crankshaft 17. As a result, the movable scroll 26 pivots with respect to the fixed scroll 24. During the pivoting of the movable scroll 26, the rotation of the movable scroll 26 is suppressed by the Oldham coupling 39.

[0057] (2-1) Flow of refrigerant The scroll compressor 101 compresses the low-pressure refrigerant flowing through the refrigerant circuit 100 and discharges the compressed refrigerant. The refrigerant before compression passes through the suction pipe 19 and the suction port 24d and is supplied to the compression chamber 40 of the compression mechanism 15. Due to the pivoting motion of the movable scroll 26, the volume of the compression chamber 40 supplied with the refrigerant before compression decreases. Therefore, in the compression chamber 40, the refrigerant is compressed into compressed refrigerant. During the process of the refrigerant being compressed, the compression chamber 40 becomes a compression chamber 40 in an intermediate pressure state.

[0058] The compressed refrigerant is discharged from the compression chamber 40 to the expansion recess 42 through the discharge hole 41. Thereafter, the compressed refrigerant passes through the first refrigerant flow path of the fixed scroll 24 and the second refrigerant flow path of the housing 23 and is supplied to the high-pressure space 71. The compressed refrigerant supplied to the high-pressure space 71 passes through the discharge pipe 20 and is discharged to the refrigerant circuit 100 outside the scroll compressor 101.

[0059] (2-2) Flow of lubricating oil When the compressed refrigerant is supplied to the high-pressure space 71, the pressure in the high-pressure space 71 rises. Therefore, the lubricating oil stored in the oil reservoir portion 10a of the high-pressure space 71 becomes high-pressure and rises in the main oil supply passage 61. The lubricating oil rising in the main oil supply passage 61 is supplied to the first sliding portion between the crankshaft 17 and the lower bearing 60, the second sliding portion between the crankshaft 17 and the upper bearing 32, and the third sliding portion between the crankshaft 17 and the upper end bearing 26c, respectively. The lubricating oil that has lubricated the first sliding portion flows into the high-pressure space 71. The lubricating oil that has lubricated the second sliding portion flows into the high-pressure space 71 and the crank chamber 23a. The lubricating oil that has lubricated the third sliding portion flows into the crank chamber 23a.

[0060] The lubricating oil that has flowed into the high-pressure space 71 from the first sliding part and the second sliding part returns to the oil reservoir part 10a. A part of the lubricating oil that has flowed into the crank chamber 23a from the second sliding part and the third sliding part passes through the oil discharge passage 23b, flows into the high-pressure space 71, and returns to the oil reservoir part 10a. Most of the lubricating oil that has flowed into the crank chamber 23a passes through the annular groove 23g, the housing oil supply passage 23c, and the oil passage 24f and is supplied to the fixed-side oil groove 80. The lubricating oil supplied to the fixed-side oil groove 80 flows into the compression chamber 40 while sealing the first thrust surface 24e. The lubricating oil that has flowed into the compression chamber 40 is mixed into the compressed refrigerant in the state of minute oil droplets, flows into the high-pressure space 71 together with the compressed refrigerant, and returns to the oil reservoir part 10a.

[0061] (3) Detailed Configuration (3-1) Swinging Motion of the Movable Scroll 26 Figures 6A to 6D show the changes in the state of the compression mechanism 15 while the movable scroll 26 is undergoing a swinging motion. Figures 6A to 6D respectively show the states 1A to 1D of the compression mechanism 15. Figures 6A to 6D are bottom views of the compression mechanism 15. Therefore, the shape of the movable scroll 26 shown in Figures 6A to 6D is symmetrical with the shape of the movable scroll 26 shown in Figure 4 which is a top view. Due to the swinging motion of the movable scroll 26, the state of the compression mechanism 15 switches in a cyclic order of state 1A, state 1B, state 1C, state 1D, state 1A, state 1B, ···

[0062] As shown in Figures 6A to 6D, the compression mechanism 15 forms a first compression chamber 40a and a second compression chamber 40b as the compression chamber 40. The first compression chamber 40a is formed outside the movable-side wrap 26b. The first compression chamber 40a is formed inside the fixed-side wrap 24b or the inner peripheral wall 24c. The second compression chamber 40b is formed inside the movable-side wrap 26b. The second compression chamber 40b is formed outside the fixed-side wrap 24b.

[0063] As shown in FIG. 3, the fixed-side oil groove 80 has a first end portion 80a located on the winding end side of the fixed-side wrap 24b. The first end portion 80a extends to the vicinity of the suction port 24d in the circumferential direction of the fixed scroll 24. The end portion on the opposite side of the first end portion 80a extends to the vicinity of the first communication passage 24h in the circumferential direction of the fixed scroll 24.

[0064] FIG. 7 shows the change in the position of the second end portion 26f on the winding end side of the movable-side wrap 26b during the turning of the movable scroll 26. As shown in FIG. 7, the first end portion 80a of the fixed-side oil groove 80 extends to a position closer to the suction port 24d than the first line segment L1 in the circumferential direction of the fixed scroll 24. The first line segment L1 connects the first contact point P1 and the second contact point P2. During the turning of the movable scroll 26, the second end portion 26f of the movable-side wrap 26b contacts the outer peripheral surface of the fixed-side wrap 24b at the first contact point P1. During the turning of the movable scroll 26, the second end portion 26f of the movable-side wrap 26b contacts the inner peripheral surface of the outer peripheral wall 24c at the second contact point P2. In state 1A, the second end portion 26f contacts the fixed-side wrap 24b at the first contact point P1. In state 1C, the second end portion 26f contacts the outer peripheral wall 24c at the second contact point P2.

[0065] FIG. 8 shows the change in the state of the compression mechanism 15 while the movable scroll 26 makes one full turn relative to the fixed scroll 24. FIG. 8 shows the angular regions in which the compression mechanism 15 assumes each of the states 1A to 1D in the angular range of 0° to 360° during which the movable scroll 26 makes one full turn. In FIG. 8, the angle at the time of switching from state 1D to state 1A is 0°. As shown in FIGS. 6A to 6D, when the compression mechanism 15 is viewed from below, the movable scroll 26 rotates counterclockwise relative to the fixed scroll 24. Therefore, in FIG. 8, the angular position of the turning movable scroll 26 increases counterclockwise.

[0066] In state 1A, as shown in FIG. 6A, the suction port 24d communicates with the first compression chamber 40a and does not communicate with the second compression chamber 40b. In state 1A, the second end portion 26f of the movable-side wrap 26b does not contact the outer peripheral wall 24c and contacts the fixed-side wrap 24b.

[0067] When the movable scroll 26 rotates and transitions from state 1A to state 1B, the second end portion 26f separates from the fixed-side wrap 24b.

[0068] In state 1B, as shown in FIG. 6B, the suction port 24d communicates with the first compression chamber 40a and does not communicate with the second compression chamber 40b. In state 1B, the second end portion 26f of the movable-side wrap 26b does not contact the outer peripheral wall 24c and the fixed-side wrap 24b.

[0069] When the movable scroll 26 rotates and transitions from state 1B to state 1C, the second end portion 26f contacts the outer peripheral wall 24c.

[0070] In state 1C, as shown in FIG. 6C, the suction port 24d does not communicate with the first compression chamber 40a and communicates with the second compression chamber 40b. In state 1C, the second end portion 26f of the movable-side wrap 26b contacts the outer peripheral wall 24c and does not contact the fixed-side wrap 24b.

[0071] When the movable scroll 26 rotates and transitions from state 1C to state 1D, the second end portion 26f separates from the outer peripheral wall 24c.

[0072] In state 1D, as shown in FIG. 6D, the suction port 24d does not communicate with the first compression chamber 40a and communicates with the second compression chamber 40b. In state 1D, the second end portion 26f of the movable-side wrap 26b does not contact the outer peripheral wall 24c and the fixed-side wrap 24b.

[0073] When the movable scroll 26 rotates and transitions from state 1D to state 1A, the second end portion 26f contacts the fixed-side wrap 24b.

[0074] As shown in FIG. 8, the angular regions where the compression mechanism 15 is in states 1A and 1C include only a specific one angle. The angular region where the compression mechanism 15 is in state 1A is 0°. The angular region where the compression mechanism 15 is in state 1C is 180°.

[0075] (3-2) Communication state of the fixed-side oil groove 80 The upper surface of the movable-side mirror plate 26a of the movable scroll 26 is a second thrust surface 26e that slides on the outer peripheral wall 24c of the fixed scroll 24 during the turning of the movable scroll 26. A pair of movable-side key grooves 26d of the movable-side mirror plate 26a are provided on the lower surface 26g on the opposite side of the second thrust surface 26e. As shown in FIG. 4, the pair of movable-side key grooves 26d are composed of a first key groove 26d1 and a second key groove 26d2.

[0076] The first key groove 26d1 is located in the circumferential direction of the movable scroll 26 in the vicinity of the second end portion 26f on the winding end side of the movable-side wrap 26b. Specifically, the first key groove 26d1 is between the second end portion 26f and the second communication passage 26h in the circumferential direction of the movable scroll 26 and is closer to the second end portion 26f. The circumferential direction of the movable scroll 26 is the circumferential direction of the circular main surface of the movable-side mirror plate 26a. The second key groove 26d2 is located on the opposite side of the first key groove 26d1 with respect to the center of the circular main surface of the movable-side mirror plate 26a.

[0077] The longitudinal directions of the first key groove 26d1 and the second key groove 26d2 are the radial direction of the movable scroll 26. The radial direction of the movable scroll 26 is the radial direction of the circular main surface of the movable-side mirror plate 26a. During the turning of the movable scroll 26, the pair of second key portions 39c of the Oldham coupling 39 slide in the radial direction of the movable scroll 26 inside the first key groove 26d1 and the second key groove 26d2.

[0078] The movable scroll 26 has two oil holes 26i penetrating through the movable-side mirror plate 26a. The oil holes 26i communicate the movable-side key groove 26d with the second thrust surface 26e. The oil holes 26i extend in the vertical direction. As shown in FIG. 4, the two oil holes 26i are composed of a first oil hole 26i1 and a second oil hole 26i2. The first oil hole 26i1 opens inside the first key groove 26d1. The second oil hole 26i2 opens inside the second key groove 26d2.

[0079] The fixed-side oil groove 80 communicates with the first oil hole 26i1 in a predetermined section of the angular region where the movable scroll 26 pivots. While the fixed-side oil groove 80 is in communication with the first oil hole 26i1, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first oil hole 26i1 and is supplied inside the first key groove 26d1.

[0080] The fixed-side oil groove 80 communicates with the second oil hole 26i2 in a predetermined section of the angular region where the movable scroll 26 pivots. While the fixed-side oil groove 80 is in communication with the second oil hole 26i2, the lubricating oil supplied to the fixed-side oil groove 80 passes through the second oil hole 26i2 and is supplied inside the second key groove 26d2.

[0081] Figures 9A to 9D show the changes in the state of the compression mechanism 15 while the movable scroll 26 is undergoing a pivoting motion. Figures 9A to 9D respectively show the states 2A to 2D of the compression mechanism 15. Due to the pivoting motion of the movable scroll 26, the state of the compression mechanism 15 switches in a cyclic order of state 2A, state 2B, state 2C, state 2D, state 2A, state 2B, ···

[0082] The angular position of the pivoting movable scroll 26 shown in FIGS. 9A to 9D and the communication state between the suction port 24d and the first compression chamber 40a or the second compression chamber 40b are the same as those in FIGS. 6A to 6D.

[0083] Figure 10 shows the change in the state of the compression mechanism 15 while the movable scroll 26 makes one full rotation relative to the fixed scroll 24. In Figure 10, in the angular range of 0° to 360° where the movable scroll 26 makes one full rotation, the angular ranges in which the compression mechanism 15 assumes the states of 1A to 1D and the states of 2A to 2D are shown.

[0084] In state 2A, as shown in Fig. 9A, the fixed-side oil groove 80 does not communicate with the first oil hole 26i1 and the second oil hole 26i2. In state 2A, lubricating oil is not supplied into the first key groove 26d1 and the second key groove 26d2.

[0085] When the movable scroll 26 rotates and shifts from state 2A to state 2B, the fixed-side oil groove 80 communicates with the second oil hole 26i2.

[0086] In state 2B, as shown in Fig. 9B, the fixed-side oil groove 80 does not communicate with the first oil hole 26i1 and communicates with the second oil hole 26i2. In state 2B, the lubricating oil supplied to the fixed-side oil groove 80 passes through the second oil hole 26i2 and is supplied into the second key groove 26d2. Lubricating oil is not supplied into the first key groove 26d1.

[0087] When the movable scroll 26 rotates and shifts from state 2B to state 2C, the fixed-side oil groove 80 no longer communicates with the second oil hole 26i2.

[0088] In state 2C, as shown in Fig. 9C, the fixed-side oil groove 80 does not communicate with the first oil hole 26i1 and the second oil hole 26i2. In state 2C, lubricating oil is not supplied into the first key groove 26d1 and the second key groove 26d2.

[0089] When the movable scroll 26 rotates and shifts from state 2C to state 2D, the fixed-side oil groove 80 communicates with the first oil hole 26i1.

[0090] In state 2D, as shown in FIG. 9D, the fixed-side oil groove 80 communicates with the first oil hole 26i1 and does not communicate with the second oil hole 26i2. In state 2D, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first oil hole 26i1 and is supplied to the inside of the first key groove 26d1. The lubricating oil is not supplied to the inside of the second key groove 26d2.

[0091] When the movable scroll 26 rotates and shifts from state 2D to state 2A, the fixed-side oil groove 80 no longer communicates with the first oil hole 26i1.

[0092] (4) Features In the first embodiment, while the movable scroll 26 makes one full rotation with respect to the fixed scroll 24, the first oil hole 26i1 moves along the dotted circle shown in FIG. 11, and the second oil hole 26i2 moves along the dotted circle shown in FIG. 12. FIGS. 11 and 12 are enlarged views of FIGS. 9A to 9D. In FIG. 11, the first oil holes 26i1a to 26i1d respectively indicate the positions of the first oil hole 26i1 in states 2A to 2D. In FIG. 12, the second oil holes 26i2a to 26i2d respectively indicate the positions of the second oil hole 26i2 in states 2A to 2D. In state 2B, the fixed-side oil groove 80 directly communicates with the inside of the second key groove 26d2 through the second oil hole 26i2b. In state 2D, the fixed-side oil groove 80 directly communicates with the inside of the first key groove 26d1 through the first oil hole 26i1d.

[0093] The first key groove 26d1 and the second key groove 26d2 communicate with the intermediate pressure space 72 where the Oldham coupling 39 is disposed. Therefore, while the movable scroll 26 is rotating, the pressure in the fixed-side oil groove 80 communicating with the high-pressure space 71 is higher than the pressures in the first key groove 26d1 and the second key groove 26d2.

[0094] As a result, in state 2B, due to the pressure difference between the fixed-side oil groove 80 and the second key groove 26d2, the lubricating oil supplied to the fixed-side oil groove 80 passes through the second oil hole 26i2 and is supplied to the second key groove 26d2. In state 2D, due to the pressure difference between the fixed-side oil groove 80 and the first key groove 26d1, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first oil hole 26i1 and is supplied to the first key groove 26d1.

[0095] Since the pair of movable-side key grooves 26d of the movable scroll 26 open downward, the lubricating oil in the movable-side key grooves 26d easily flows down. If the lubricating oil inside the movable-side key grooves 26d is insufficient, there is a risk of poor lubrication in the sliding part between the oldham joint 39 and the movable scroll 26. In the scroll compressor 101 of the first embodiment, during the rotation of the movable scroll 26, the lubricating oil in the fixed-side oil groove 80 is supplied to the pair of movable-side key grooves 26d through the pair of oil holes 26i of the movable-side mirror plate 26a. Therefore, the scroll compressor 101 has the effect of suppressing the occurrence of poor lubrication in the sliding part between the oldham joint 39 and the movable scroll 26.

[0096] <Second Embodiment> (1) Configuration The scroll compressor 101 of the second embodiment has the same basic configuration and operation as the scroll compressor 101 of the first embodiment. Hereinafter, the description will focus on the differences from the first embodiment.

[0097] In the second embodiment, as shown in FIG. 13, a pair of oil supply grooves 26j are formed in the second thrust surface 26e of the movable scroll 26. The pair of oil supply grooves 26j are composed of a first oil supply groove 26j1 and a second oil supply groove 26j2. The first oil hole 26i1 opens inside the first oil supply groove 26j1. The second oil hole 26i2 opens inside the second oil supply groove 26j2. The first oil supply groove 26j1 and the second oil supply groove 26j2 are linear and extend in a predetermined direction.

[0098] The fixed-side oil groove 80 communicates with the first oil supply groove 26j1 in a predetermined section of the angular region where the movable scroll 26 rotates. While the fixed-side oil groove 80 is in communication with the first oil supply groove 26j1, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first oil supply groove 26j1 and the first oil hole 26i1 and is supplied to the inside of the first key groove 26d1.

[0099] The fixed-side oil groove 80 communicates with the second oil supply groove 26j2 in a predetermined section of the angular region where the movable scroll 26 rotates. While the fixed-side oil groove 80 is in communication with the second oil supply groove 26j2, the lubricating oil supplied to the fixed-side oil groove 80 passes through the second oil supply groove 26j2 and the second oil hole 26i2 and is supplied to the inside of the second key groove 26d2.

[0100] Figures 14A to 14D show the changes in the state of the compression mechanism 15 while the movable scroll 26 is undergoing a turning motion. Figures 14A to 14D respectively show the states 3A to 3D of the compression mechanism 15. Due to the turning motion of the movable scroll 26, the state of the compression mechanism 15 switches in a cyclic order of state 3A, state 3B, state 3C, state 3D, state 3A, state 3B, ···

[0101] The angular position of the turning movable scroll 26 and the communication state between the suction port 24d and the first compression chamber 40a or the second compression chamber 40b shown in Figures 14A to 14D are the same as those in Figures 6A to 6D of the first embodiment. Therefore, the states 1A to 1D of the first embodiment are applicable to the second embodiment.

[0102] Figure 15 shows the changes in the state of the compression mechanism 15 while the movable scroll 26 makes one full turn relative to the fixed scroll 24. In Figure 15, in the angular region of 0° to 360° where the movable scroll 26 makes one full turn, the angular regions in which the compression mechanism 15 assumes the states 1A to 1D and the angular regions in which the compression mechanism 15 assumes the states 3A to 3D are shown.

[0103] In state 3A, as shown in FIG. 14A, the fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1 and the second oil supply groove 26j2. In state 3A, lubricating oil is not supplied into the first key groove 26d1 and the second key groove 26d2.

[0104] When the movable scroll 26 rotates and shifts from state 3A to state 3B, the fixed-side oil groove 80 communicates with the second oil supply groove 26j2.

[0105] In state 3B, as shown in FIG. 14B, the fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1 and communicates with the second oil supply groove 26j2. In state 3B, the lubricating oil supplied to the fixed-side oil groove 80 passes through the second oil supply groove 26j2 and the second oil hole 26i2 and is supplied into the second key groove 26d2. Lubricating oil is not supplied into the first key groove 26d1.

[0106] When the movable scroll 26 rotates and shifts from state 3B to state 3C, the fixed-side oil groove 80 no longer communicates with the second oil supply groove 26j2.

[0107] In state 3C, as shown in FIG. 14C, the fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1 and the second oil supply groove 26j2. In state 3C, lubricating oil is not supplied into the first key groove 26d1 and the second key groove 26d2.

[0108] When the movable scroll 26 rotates and shifts from state 3C to state 3D, the fixed-side oil groove 80 communicates with the first oil supply groove 26j1.

[0109] In state 3D, as shown in FIG. 14D, the fixed-side oil groove 80 communicates with the first oil supply groove 26j1 and does not communicate with the second oil supply groove 26j2. In state 3D, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first oil supply groove 26j1 and the first oil hole 26i1 and is supplied into the first key groove 26d1. Lubricating oil is not supplied into the second key groove 26d2.

[0110] When the movable scroll 26 rotates and shifts from state 3D to state 3A, the fixed-side oil groove 80 no longer communicates with the first oil supply groove 26j1.

[0111] (2) Features In the second embodiment, while the movable scroll 26 makes one full rotation with respect to the fixed scroll 24, the first oil supply groove 26j1 moves along the dotted circle shown in Fig. 16, and the second oil supply groove 26j2 moves along the dotted circle shown in Fig. 17. Figs. 16 and 17 are enlarged views of Figs. 14A to 14D. In Fig. 16, the first oil supply grooves 26j1a to 26j1d indicate the positions of the first oil supply groove 26j1 in states 3A to 3D, respectively. In Fig. 17, the second oil supply grooves 26j2a to 26j2d indicate the positions of the second oil supply groove 26j2 in states 3A to 3D, respectively. In state 3B, the fixed-side oil groove 80 communicates directly with the inside of the second key groove 26d2 through the second oil supply groove 26j2b and the second oil hole 26i2b. In state 3D, the fixed-side oil groove 80 communicates directly with the inside of the first key groove 26d1 through the first oil supply groove 26j1d and the first oil hole 26i1d.

[0112] Similar to the first embodiment, in state 3B, due to the pressure difference between the fixed-side oil groove 80 and the second key groove 26d2, the lubricating oil supplied to the fixed-side oil groove 80 passes through the second oil supply groove 26j2b and the second oil hole 26i2 and is supplied to the second key groove 26d2. In state 3D, due to the pressure difference between the fixed-side oil groove 80 and the first key groove 26d1, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first oil supply groove 26j1d and the first oil hole 26i1 and is supplied to the first key groove 26d1.

[0113] In the scroll compressor 101 of the second embodiment, during the rotation of the movable scroll 26, the lubricating oil in the fixed-side oil groove 80 is supplied to the pair of movable-side key grooves 26d through the pair of oil supply grooves 26j and the pair of oil holes 26i of the movable-side mirror plate 26a. Therefore, the scroll compressor 101 has the effect of suppressing the occurrence of poor lubrication in the sliding portion between the Oldham coupling 39 and the movable scroll 26.

[0114] In the scroll compressor 101 of the second embodiment, an oil supply groove 26j communicating with the oil hole 26i is formed in the second thrust surface 26e. By adjusting the position and dimensions of the oil supply groove 26j, for example, the position of the oil hole 26i can be formed at the center of the movable side key groove 26d. By providing the oil hole 26i at the center of the movable side key groove 26d, the lubricating oil supplied to the movable side key groove 26d can be evenly supplied to the entire sliding portion between the movable side key groove 26d and the second key portion 39c. Therefore, the scroll compressor 101 has the effect of suppressing the occurrence of poor lubrication in the sliding portion between the Oldham coupling 39 and the movable scroll 26.

[0115] <Third Embodiment> (1) Configuration The scroll compressor 101 of the third embodiment has the same basic configuration and operation as the scroll compressor 101 of the second embodiment. Hereinafter, the description will focus on the differences from the second embodiment.

[0116] In the third embodiment, as shown in FIG. 18, a first oil supply groove 26j1, a second oil supply groove 26j2, a first movable side oil groove 81, and a second movable side oil groove 82 are formed in the second thrust surface 26e of the movable scroll 26. The first oil supply groove 26j1 and the second oil supply groove 26j2 are formed at the same position as in the second embodiment and have the same shape as in the second embodiment. The first oil supply groove 26j1 communicates with the first oil hole 26i1. The second oil supply groove 26j2 communicates with the second oil hole 26i2.

[0117] The first movable side oil groove 81 communicates with the fixed side oil groove 80 during the rotation of the movable scroll 26. The first movable side oil groove 81 communicates with the second compression chamber 40b at a position closer to the suction port 24d than the first line segment L1 during the rotation of the movable scroll 26. The first movable side oil groove 81 is formed in the vicinity of the second end 26f of the movable side wrap 26b. The first movable side oil groove 81 has a linear shape extending in a predetermined direction.

[0118] The second movable-side oil groove 82 communicates with the fixed-side oil groove 80 during the rotation of the movable scroll 26. The second movable-side oil groove 82 communicates with the first compression chamber 40a during the rotation of the movable scroll 26. As shown in FIG. 18, the second movable-side oil groove 82 has an arc-shaped first groove portion 82a extending in the circumferential direction of the movable scroll 26 and a linear second groove portion 82b extending in the radial direction of the movable scroll 26.

[0119] The fixed-side oil groove 80 communicates with the first oil supply groove 26j1 in the first section S1 of the angular region where the movable scroll 26 rotates. In other words, the fixed-side oil groove 80 communicates with the first oil hole 26i1 in the first section S1. In the first section S1, the lubricating oil in the fixed-side oil groove 80 passes through the first oil supply groove 26j1 and the first oil hole 26i1 and is supplied to the first key groove 26d1.

[0120] The fixed-side oil groove 80 communicates with the second oil supply groove 26j2 in the second section S2 of the angular region where the movable scroll 26 rotates. In other words, the fixed-side oil groove 80 communicates with the second oil hole 26i2 in the second section S2. In the second section S2, the lubricating oil in the fixed-side oil groove 80 passes through the second oil supply groove 26j2 and the second oil hole 26i2 and is supplied to the second key groove 26d2.

[0121] The fixed-side oil groove 80 communicates with the first compression chamber 40a via the second movable-side oil groove 82 in the third section S3 of the angular region where the movable scroll 26 rotates. In the third section S3, the lubricating oil in the fixed-side oil groove 80 passes through the second movable-side oil groove 82 and is supplied to the first compression chamber 40a that communicates with the suction port 24d.

[0122] The fixed-side oil groove 80 communicates with the second compression chamber 40b via the first movable-side oil groove 81 in the fourth section S4 of the angular region where the movable scroll 26 rotates. In the fourth section S4, the lubricating oil in the fixed-side oil groove 80 passes through the first movable-side oil groove 81 and is supplied to the second compression chamber 40b that communicates with the suction port 24d at a position closer to the suction port 24d than the first line segment L1.

[0123] Figures 19A to 19I show the changes in the state of the compression mechanism 15 while the movable scroll 26 is undergoing a turning motion. Figures 19A to 19I respectively show states 4A to 4I of the compression mechanism 15. Due to the turning motion of the movable scroll 26, the state of the compression mechanism 15 switches in a cyclic order of state 4A, state 4B, state 4C, state 4D, state 4E, state 4F, state 4G, state 4H, state 4I, state 4A, state 4B, ···.

[0124] The angular position of the movable scroll 26 during turning and the communication state between the suction port 24d and the first compression chamber 40a or the second compression chamber 40b shown in Figures 19A to 19I are the same as those in Figures 6A to 6D of the first embodiment. Therefore, states 1A to 1D of the first embodiment are applicable to the third embodiment.

[0125] Figure 20 shows the changes in the state of the compression mechanism 15 while the movable scroll 26 makes one full turn relative to the fixed scroll 24. In Figure 20, in the angular range of 0° to 360° where the movable scroll 26 makes one full turn, the angular ranges in which the compression mechanism 15 assumes states 1A to 1D and the angular ranges in which it assumes states 4A to 4I are shown. In Figure 20, a first section S1, a second section S2, a third section S3, and a fourth section S4 are shown. The first section S1 corresponds to the section where the state of the compression mechanism 15 is state 4H. The second section S2 corresponds to the section where the state of the compression mechanism 15 is state 4D. The third section S3 corresponds to the section where the state of the compression mechanism 15 is state 4B. The fourth section S4 corresponds to the section where the state of the compression mechanism 15 is state 4F. As shown in Figure 20, the first section S1, the second section S2, the third section S3, and the fourth section S4 do not overlap with each other.

[0126] In state 4A, as shown in FIG. 19A, the fixed-side oil groove 80 communicates with the second movable-side oil groove 82. The fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1, the second oil supply groove 26j2, and the first movable-side oil groove 81. The first movable-side oil groove 81 communicates with the first compression chamber 40a. The first movable-side oil groove 81 does not communicate with the second compression chamber 40b. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 4A, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 is supplied to the second movable-side oil groove 82. The lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0127] When the movable scroll 26 rotates and shifts from state 4A to state 4B, the second movable-side oil groove 82 communicates with the first compression chamber 40a.

[0128] In state 4B, as shown in FIG. 19B, the fixed-side oil groove 80 communicates with the second movable-side oil groove 82. The fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1, the second oil supply groove 26j2, and the first movable-side oil groove 81. The first movable-side oil groove 81 communicates with the first compression chamber 40a. The first movable-side oil groove 81 does not communicate with the second compression chamber 40b. The second movable-side oil groove 82 communicates with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the second compression chamber 40b. In state 4B, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 passes through the second movable-side oil groove 82 and is supplied to the first compression chamber 40a. The lubricating oil is not supplied to the second compression chamber 40b.

[0129] When the movable scroll 26 rotates and shifts from state 4B to state 4C, the second movable-side oil groove 82 no longer communicates with the first compression chamber 40a.

[0130] In state 4C, as shown in FIG. 19C, the fixed-side oil groove 80 communicates with the second movable-side oil groove 82. The fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1, the second oil supply groove 26j2, and the first movable-side oil groove 81. The first movable-side oil groove 81 communicates with the first compression chamber 40a. The first movable-side oil groove 81 does not communicate with the second compression chamber 40b. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 4C, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 is supplied to the second movable-side oil groove 82. No lubricating oil is supplied to the first compression chamber 40a and the second compression chamber 40b.

[0131] When the movable scroll 26 rotates and shifts from state 4C to state 4D, the fixed-side oil groove 80 communicates with the second oil supply groove 26j2. When the second end portion 26f of the movable-side wrap 26b contacts the outer peripheral wall 24c, the first movable-side oil groove 81 no longer communicates with the first compression chamber 40a and communicates with the second compression chamber 40b.

[0132] In state 4D, as shown in FIG. 19D, the fixed-side oil groove 80 communicates with the second movable-side oil groove 82 and the second oil supply groove 26j2. The fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1 and the first movable-side oil groove 81. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 4D, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 passes through the second oil supply groove 26j2 and the second oil hole 26i2 and is supplied to the second key groove 26d2. No lubricating oil is supplied to the first compression chamber 40a and the second compression chamber 40b.

[0133] When the movable scroll 26 rotates and shifts from state 4D to state 4E, the fixed-side oil groove 80 no longer communicates with the second movable-side oil groove 82 and the second oil supply groove 26j2.

[0134] In state 4E, as shown in FIG. 19E, the fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1, the second oil supply groove 26j2, the first movable-side oil groove 81, and the second movable-side oil groove 82. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. Lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0135] When the movable scroll 26 rotates and shifts from state 4E to state 4F, the fixed-side oil groove 80 communicates with the first movable-side oil groove 81.

[0136] In state 4F, as shown in FIG. 19F, the fixed-side oil groove 80 communicates with the first movable-side oil groove 81. The fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1, the second oil supply groove 26j2, and the second movable-side oil groove 82. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 4F, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 passes through the first movable-side oil groove 81 and is supplied to the second compression chamber 40b. Lubricating oil is not supplied to the first compression chamber 40a.

[0137] When the movable scroll 26 rotates and shifts from state 4F to state 4G, the fixed-side oil groove 80 no longer communicates with the first movable-side oil groove 81.

[0138] In state 4G, as shown in FIG. 19G, the fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1, the second oil supply groove 26j2, the first movable-side oil groove 81, and the second movable-side oil groove 82. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. Lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0139] When the movable scroll 26 rotates and shifts from state 4G to state 4H, the fixed-side oil groove 80 communicates with the first oil supply groove 26j1.

[0140] In state 4H, as shown in FIG. 19H, the fixed-side oil groove 80 communicates with the first oil supply groove 26j1. The fixed-side oil groove 80 does not communicate with the second oil supply groove 26j2, the first movable-side oil groove 81, and the second movable-side oil groove 82. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 4H, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 passes through the first oil supply groove 26j1 and the first oil hole 26i1 and is supplied to the first key groove 26d1. The lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0141] When the movable scroll 26 rotates and shifts from state 4H to state 4I, the fixed-side oil groove 80 no longer communicates with the first oil supply groove 26j1. The fixed-side oil groove 80 communicates with the second movable-side oil groove 82.

[0142] In state 4I, as shown in FIG. 19I, the fixed-side oil groove 80 communicates with the second movable-side oil groove 82. The fixed-side oil groove 80 does not communicate with the first oil supply groove 26j1, the second oil supply groove 26j2, and the first movable-side oil groove 81. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. The lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0143] When the movable scroll 26 rotates and shifts from state 4I to state 4A, when the second end portion 26f of the movable-side wrap 26b contacts the fixed-side wrap 24b, the first movable-side oil groove 81 no longer communicates with the second compression chamber 40b and communicates with the first compression chamber 40a.

[0144] (2) Features In the third embodiment, while the movable scroll 26 makes one full rotation relative to the fixed scroll 24, in state 4H, the fixed-side oil groove 80 communicates directly with the first key groove 26d1 via the first oil supply groove 26j1 and the first oil hole 26i1. In state 4D, the fixed-side oil groove 80 communicates directly with the second key groove 26d2 via the second oil supply groove 26j2 and the second oil hole 26i2. In state 4B, the fixed-side oil groove 80 communicates directly with the first compression chamber 40a via the second movable-side oil groove 82. In state 4F, the fixed-side oil groove 80 communicates directly with the second compression chamber 40b via the first movable-side oil groove 81.

[0145] The first compression chamber 40a and the second compression chamber 40b that communicate with the suction port 24d are filled with the refrigerant before compression. Therefore, while the movable scroll 26 is making a swirling motion, the pressure in the fixed-side oil groove 80 that communicates with the high-pressure space 71 is higher than the pressure in the first compression chamber 40a and the second compression chamber 40b that communicate with the suction port 24d.

[0146] Therefore, in state 4B, due to the pressure difference between the fixed-side oil groove 80 and the first compression chamber 40a, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 is supplied to the first compression chamber 40a. Therefore, the scroll compressor 101 has the effect of suppressing the leakage of the refrigerant from the first compression chamber 40a. In state 4F, due to the pressure difference between the fixed-side oil groove 80 and the second compression chamber 40b, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 is supplied to the second compression chamber 40b. Therefore, the scroll compressor 101 has the effect of suppressing the leakage of the refrigerant from the second compression chamber 40b.

[0147] Also, in state 4H, due to the pressure difference between the fixed-side oil groove 80 and the first key groove 26d1, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 is supplied to the first key groove 26d1. In state 4D, due to the pressure difference between the fixed-side oil groove 80 and the second key groove 26d2, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 is supplied to the second key groove 26d2. Therefore, the scroll compressor 101 has the effect of suppressing the occurrence of poor lubrication at the sliding portion between the Oldham coupling 39 and the movable scroll 26.

[0148] In the third embodiment, in the first section S1, lubricating oil is supplied to the first key groove 26d1. In the second section S2, lubricating oil is supplied to the second key groove 26d2. In the third section S3, lubricating oil is supplied to the first compression chamber 40a. In the fourth section S4, lubricating oil is supplied to the second compression chamber 40b. As shown in FIG. 20, the first section S1, the second section S2, the third section S3, and the fourth section S4 do not overlap with each other. In other words, while the movable scroll 26 is performing a turning motion, lubricating oil is not simultaneously supplied to at least two of the first key groove 26d1, the second key groove 26d2, the first compression chamber 40a, and the second compression chamber 40b. If lubricating oil is simultaneously supplied to at least two of these, the amount and pressure of the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 are reduced, and there is a possibility that the lubricating oil is not sufficiently supplied to the first key groove 26d1 and the second key groove 26d2. Therefore, the scroll compressor 101 has an effect of suppressing the occurrence of poor lubrication in the sliding portion between the Oldham coupling 39 and the movable scroll 26.

[0149] <Modification> (1) Modification A In the second to third embodiments, the first oil supply groove 26j1 and the second oil supply groove 26j2 have a linear shape extending in a predetermined direction. The shapes of the first oil supply groove 26j1 and the second oil supply groove 26j2 are not limited to a linear shape.

[0150] For example, as shown in FIGS. 21A and 21B, the first oil supply groove 26j1 may have an extension portion 91 extending in the circumferential direction of the movable scroll 26. FIGS. 21A and 21B are enlarged views similar to FIG. 16.

[0151] The first oil supply groove 26j1 shown in FIG. 21A has one extension portion 91 and one oil supply portion 92. The oil supply portion 92 extends, for example, in the radial direction of the movable scroll 26. The oil supply portion 92 is connected to one end of the extension portion 91. The first oil hole 26i1 is an end of the first oil supply groove 26j1 and opens at the other end of the extension portion 91. During the turning of the movable scroll 26, the first end 80a of the fixed-side oil groove 80 communicates with the oil supply portion 92.

[0152] The first oil supply groove 26j1 shown in FIG. 21B has one extension portion 91 and two oil supply portions 92. The two oil supply portions 92 are connected to both end portions of the extension portion 91. The dimensions of the two oil supply portions 92 may be different from each other. During the rotation of the movable scroll 26, the first end portion 80a of the fixed-side oil groove 80 communicates with one of the oil supply portions 92. The first oil hole 26i1 opens at the end portion of the other oil supply portion 92.

[0153] The extension portion 91 extends in the circumferential direction which is the rotation direction of the movable scroll 26. Therefore, the lubricating oil in the extension portion 91 is easily supplied to the first thrust surface 24e and the second thrust surface 26e by the rotational movement of the movable scroll 26. Accordingly, the first oil supply groove 26j1 having the extension portion 91 has the effect of promoting the oil supply to the first thrust surface 24e and the second thrust surface 26e.

[0154] The oil supply portion 92 extends in the radial direction from the first oil supply groove 26j1 toward the compression chamber 40. Therefore, by providing the oil supply portion 92, the time during which the fixed-side oil groove 80 communicates with the first oil supply groove 26j1 becomes longer during the rotation of the movable scroll 26. Accordingly, the first oil supply groove 26j1 having the oil supply portion 92 has the effect of promoting the oil supply to the first key groove 26d1.

[0155] Also, by changing the positions and dimensions of the extension portion 91 and the oil supply portion 92, the time during which the fixed-side oil groove 80 communicates with the first oil supply groove 26j1 and the amount of lubricating oil that the first oil supply groove 26j1 can hold during the rotation of the movable scroll 26 can be adjusted. Accordingly, the first oil supply groove 26j1 having the extension portion 91 and the oil supply portion 92 has the effect of being able to adjust the timing and the amount of oil supply from the fixed-side oil groove 80 to the first key groove 26d1.

[0156] (2) Modification B In the first to third embodiments, the movable scroll 26 has the first oil hole 26i1 and the second oil hole 26i2. The movable scroll 26 may have only the first oil hole 26i1. The movable scroll 26 may have only the second oil hole 26i2.

[0157] In the second to third embodiments, the movable scroll 26 has a first oil supply groove 26j1 and a second oil supply groove 26j2. When the movable scroll 26 has only the first oil hole 26i1, the movable scroll 26 has only the first oil supply groove 26j1 communicating with the first oil hole 26i1. When the movable scroll 26 has only the second oil hole 26i2, the movable scroll 26 has only the second oil supply groove 26j2 communicating with the second oil hole 26i2.

[0158] As described above, although the embodiments of the present disclosure have been described, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure described in the claims.

Explanation of Reference Numerals

[0159] 1: Refrigeration device 24: Fixed scroll 24a: Fixed-side mirror plate (first mirror plate) 24b: Fixed-side wrap (first wrap) 24c: Outer peripheral wall 24d: Suction port 24e: First thrust surface (first surface) 24f: Oil passage 26: Movable scroll 26a: Movable-side mirror plate (second mirror plate) 26b: Movable-side wrap (second wrap) 26d: Movable-side key groove (key groove) 26d1: First key groove 26d2: Second key groove 26e: Second thrust surface (second surface) 26g: Lower surface of movable-side mirror plate (third surface) 26i: Oil hole 26i1: First oil hole 26i2: Second oil hole 26j: Oil supply groove (fourth oil groove) 39: Oldham coupling 39a: Annular main body (main body) 39c: Second key portion (key) 40a: First compression chamber 40b: Second compression chamber 80: Fixed-side oil groove (first oil groove) 81: First movable-side oil groove (third oil groove) 82: Second movable-side oil groove (second oil groove) 91: Extension part 100: Refrigerant circuit 101: Scroll compressor S1: First section S2: Second section S3: Third section S4: Fourth section

Prior Art Documents

Patent Documents

[0160]

Patent Document 1

Claims

1. a fixed scroll (24) having a first end plate (24a), an outer peripheral wall (24c) standing on an outer edge portion of the first end plate, and a first spiral wrap (24b) standing on the first end plate inside the outer peripheral wall; a movable scroll (26) having a second end plate (26a) and a second spiral wrap (26b) standing on the second end plate; An Oldham coupling (39) having an annular body (39a) and a key (39c) extending from the body, the Oldham coupling (39) being configured to suppress rotation of the movable scroll during orbital movement; Equipped with A first oil groove (80) extending in a circumferential direction is provided on a first surface (24e) of the outer peripheral wall that slides against the second end plate, The fixed scroll is provided with an oil passage (24f) that communicates with the first oil groove and supplies oil to the first oil groove, A third surface (26g) of the second end plate opposite to the second surface (26e) that slides against the outer circumferential wall is provided with a key groove (26d) in which the key slides during orbital movement of the movable scroll, The second end plate is provided with an oil hole (26i) that communicates the key groove and the second surface, The first oil groove communicates with the oil hole in a predetermined section of an angular region in which the movable scroll orbits. Scroll compressor (101).

2. A pair of key grooves consisting of a first key groove (26d1) and a second key groove (26d2) is provided on the third surface, The second end plate is provided with a first oil hole (26i1) which is the oil hole communicating with the first key groove, and a second oil hole (26i2) which is the oil hole communicating with the second key groove.

2. The scroll compressor according to claim 1.

3. The fixed scroll is further provided with a suction port (24d) that opens near the end of the first wrap, the fixed scroll and the movable scroll define a first compression chamber (40a) formed outside the second wrap and a second compression chamber (40b) formed inside the second wrap and communicating with the suction port, The second surface is provided with a second oil groove (82) and a third oil groove (81), the second oil groove communicates with the first oil groove and the first compression chamber during orbital movement of the movable scroll, The third oil groove communicates with the first oil groove and the second compression chamber during orbital movement of the movable scroll. The scroll compressor according to claim 2.

4. The first oil groove is In a first section (S1) of an angular region in which the movable scroll orbits, the movable scroll communicates with the first oil hole, In a second section (S2) of the angular region in which the movable scroll orbits, the second oil hole is communicated with the second oil hole, in a third section (S3) of an angular region in which the movable scroll orbits, the movable scroll communicates with the first compression chamber via the second oil groove, in a fourth section (S4) of an angular region in which the movable scroll orbits, the movable scroll communicates with the second compression chamber via the third oil groove, the first section, the second section, the third section, and the fourth section do not overlap with each other; The scroll compressor according to claim 3.

5. The second surface is further provided with a fourth oil groove (26j) communicating with the oil hole, The first oil groove communicates with the oil hole via the fourth oil groove in a predetermined section of an angular region in which the movable scroll orbits. The scroll compressor according to any one of claims 1 to 4.

6. The fourth oil groove has an extension portion (91) extending in the circumferential direction. The scroll compressor according to claim 5.

7. A scroll compressor (101) according to any one of claims 1 to 4; a refrigerant circuit (100) through which a refrigerant compressed by the scroll compressor flows; Equipped with Refrigeration device (1).

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