Scroll compressor, and refrigeration device

Abstract

There is a risk that leakage of refrigerant from the compression chamber where the refrigerant is compressed, formed inside the wrap of the movable scroll, may not be sufficiently suppressed. 【Solution means】The scroll compressor 101 includes a fixed scroll 24 and a movable scroll 26. A first thrust surface 24e that slides with the movable-side mirror plate 26a on the outer peripheral wall 24c of the fixed scroll 24 is provided with a fixed-side oil groove 80 extending in the circumferential direction. The fixed scroll 24 is provided with an oil passage 24f for supplying oil to the fixed-side oil groove 80 and a suction port 24d that opens near the end of winding of the fixed-side wrap 24b. During the rotation of the movable scroll 26, the second end 26f on the winding end side of the movable-side wrap 26b contacts the fixed-side wrap 24b at the first contact point P1 and contacts the outer peripheral wall 24c at the second contact point P2. The first end 80a of the fixed-side oil groove 80 extends in the circumferential direction to a position closer to the suction port 24d than a first line segment L1 connecting the first contact point P1 and the second contact point P2.

Description

Technical Field

[0001] Relates to a scroll compressor and a refrigeration device.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2016-160816), a scroll compressor is known in which a fixed-side oil groove is formed on the end face of the outer peripheral wall of a fixed scroll, and a movable-side oil groove is formed on the mirror plate on the outer side of the wrap of a movable scroll. High-pressure lubricating oil is supplied to the fixed-side oil groove. During the rotation of the movable scroll, the movable-side oil groove communicates with the fixed-side oil groove, and the lubricating oil in the fixed-side oil groove is supplied to the movable-side oil groove. Further, during the rotation of the movable scroll, the movable-side oil groove communicates with an outer compression chamber formed on the outer side of the wrap of the movable scroll where the refrigerant is compressed, and the lubricating oil in the movable-side oil groove is supplied to the outer compression chamber.

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. 2016-160816), during the rotation of the movable scroll, the movable-side oil groove does not communicate with an inner compression chamber formed on the inner side of the wrap of the movable scroll where the refrigerant is compressed. Therefore, the lubricating oil in the movable-side oil groove is not sufficiently supplied to the inner compression chamber, and there is a possibility that the leakage of the refrigerant from the inner compression chamber is not sufficiently suppressed.

Means for Solving the Problems

[0004] The scroll compressor of the first aspect includes a fixed scroll and a movable scroll. 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. A first oil groove extending in the circumferential direction is provided on a first surface of the outer peripheral wall that slides with the second mirror plate. The fixed scroll is provided with an oil passage that communicates with the first oil groove and supplies oil to the first oil groove, and a suction port that opens near the end of the winding of the first wrap. During the rotation of the movable scroll, a second end portion on the winding end side of the second wrap contacts the first wrap at a first contact point and contacts the outer peripheral wall at a second contact point. A first end portion of the first oil groove located on the winding end side of the first wrap extends in the circumferential direction to a position closer to the suction port than a first line segment connecting the first contact point and the second contact point.

[0005] Since the scroll compressor of the first aspect is provided with an oil groove on the fixed scroll for sufficiently supplying lubricating oil to the compression chamber inside the wrap of the movable scroll, leakage of the refrigerant from the compression chamber can be suppressed.

[0006] The scroll compressor of the second aspect is the scroll compressor of the first aspect, wherein the fixed 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. A second oil groove is provided on a second surface of the second mirror plate that slides with the outer peripheral wall. The second oil groove communicates with the first oil groove during the rotation of the movable scroll. The second oil groove communicates with the first compression chamber or the second compression chamber at a position closer to the suction port than the first line segment during the rotation of the movable scroll.

[0007] Since the scroll compressor of the second aspect is provided with oil grooves on the fixed scroll and the movable scroll for sufficiently supplying lubricating oil to the compression chamber inside the wrap of the movable scroll, leakage of the refrigerant from the compression chamber can be suppressed.

[0008] The scroll compressor according to the third aspect is the scroll compressor according to the second aspect, wherein the second oil groove communicates with the second compression chamber to supply oil to the second compression chamber during a predetermined period including the time when the second lap contacts the outer peripheral wall during the rotation of the movable scroll.

[0009] The scroll compressor according to the third aspect can suppress the leakage of refrigerant from the compression chamber inside the lap of the movable scroll.

[0010] The scroll compressor according to the fourth aspect is the scroll compressor according to the second or third aspect, wherein the second oil groove communicates with the first oil groove and at the same time communicates with the first compression chamber or the second compression chamber in a predetermined section of the angular region where the movable scroll rotates.

[0011] The scroll compressor according to the fourth aspect can suppress the leakage of refrigerant from the compression chamber inside the lap of the movable scroll.

[0012] The scroll compressor according to the fifth aspect is the scroll compressor according to the second or third aspect, wherein the second oil groove communicates with the first oil groove in the first section of the angular region where the movable scroll rotates, and does not communicate with the first compression chamber and the second compression chamber. The second oil groove communicates with the first compression chamber or the second compression chamber in the second section of the angular region where the movable scroll rotates, and does not communicate with the first oil groove. The first section and the second section do not overlap each other.

[0013] The scroll compressor according to the fifth aspect can suppress the leakage of refrigerant from the compression chamber inside the lap of the movable scroll.

[0014] The scroll compressor according to the sixth aspect is the scroll compressor according to any one of the second to fifth aspects, wherein a third oil groove is further provided on the second surface. The third oil groove communicates with the first oil groove and the first compression chamber during the rotation of the movable scroll. The second oil groove communicates with the second compression chamber in the third section of the angular region where the movable scroll rotates. The third oil groove communicates with the first compression chamber in the fourth section of the angular region where the movable scroll rotates. The third section and the fourth section do not overlap each other.

[0015] The scroll compressor according to the sixth aspect can suppress the leakage of the refrigerant from the compression chamber inside the wrap of the movable scroll and the compression chamber outside the wrap of the movable scroll.

[0016] The scroll compressor according to the seventh aspect is any one of the scroll compressors according to the first to sixth aspects, and the second oil groove has an extension portion extending in the circumferential direction.

[0017] The scroll compressor according to the seventh aspect can promote the supply of lubricating oil to the sliding portion between the fixed scroll and the movable scroll.

[0018] The refrigeration device according to the eighth aspect includes any one of the scroll compressors according to the first to seventh aspects and a refrigerant circuit through which the refrigerant compressed by the scroll compressor flows.

[0019] The refrigeration device according to the eighth aspect can suppress the leakage of the refrigerant from the compression chamber of the scroll compressor and improve the efficiency.

Brief Description of the Drawings

[0020]

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Modes for Carrying Out the Invention

[0021] <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.

[0022] 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.

[0023] 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.

[0024] (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.

[0025] 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.

[0026] 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 becomes large. Therefore, it is preferable to actively supply lubricating oil to the sliding portion.

[0027] (1-2) Compression mechanism 15 The compression mechanism 15 sucks in and compresses low-temperature and low-pressure refrigerant gas, and discharges high-temperature and high-pressure refrigerant gas (hereinafter referred to as "compressed refrigerant"). The compression mechanism 15 includes 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 around the fixed scroll 24.

[0028] As shown in FIG. 3, the fixed scroll 24 includes 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 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 center of the fixed-side mirror plate 24a to 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.

[0029] As shown in FIG. 4, the movable scroll 26 includes 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 center of the lower surface of the movable-side mirror plate 26a. The movable-side wrap 26b extends from the start of winding located at the center of the movable-side mirror plate 26a to 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 of the movable-side mirror plate 26a.

[0030] 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 platen 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 platen 26a.

[0031] An intake port 24d is formed in the fixed scroll 24. The intake port 24d opens near the end of the 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.

[0032] An enlarged recess 42, which is a cylindrical depression, is formed on the upper surface of the fixed-side platen 24a of the fixed scroll 24. The enlarged recess 42 is covered with a cover member 44. A discharge hole 41 is formed on the bottom surface of the enlarged recess 42. The discharge hole 41 is provided at the center of the fixed-side platen 24a. The discharge hole 41 is a hole that penetrates the fixed-side platen 24a in the vertical direction. The discharge hole 41 communicates the compression chamber 40 and the enlarged recess 42.

[0033] A first refrigerant flow path (not shown) is formed in the fixed-side platen 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.

[0034] As shown in FIG. 3, a fixed-side oil groove 80 is formed in the first thrust surface 24e, which is the lower surface of the outer peripheral wall 24c of the fixed scroll 24 and slides on the upper surface of the movable-side platen 26a. 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.

[0035] 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.

[0036] A first communication passage 24h is formed in the outer peripheral wall 24c of the fixed scroll 24. 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 on 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.

[0037] A second communication passage 26h is formed in the outer peripheral portion of the movable-side mirror plate 26a of the movable scroll 26. 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 described later.

[0038] (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.

[0039] 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.

[0040] 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.

[0041] 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 in the outer peripheral portion of the bottom surface of the crank chamber 23a.

[0042] 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.

[0043] The housing 23 is formed with a housing oil supply passage 23c for supplying lubricating oil to the compression mechanism 15. 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.

[0044] (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.

[0045] 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 within 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 within the movable-side key groove 26d. Thereby, the rotation of the rotating movable scroll 26 is suppressed.

[0046] (1-5) Motor 16 The motor 16 is disposed below the housing 23. The motor 16 has a stator 51 and a rotor 52.

[0047] 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). By winding a wire around the teeth, the coil 51b is formed.

[0048] A plurality of core cuts are formed on the outer peripheral surface of the stator core 51a. The core cut is a groove formed in the vertical direction from the upper end surface to the lower end surface of the stator core 51a.

[0049] 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.

[0050] The motor 16 functions as a power source for rotating the movable scroll 26 through the rotation of the crankshaft 17 to compress the gas refrigerant in the compression chamber 40.

[0051] (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.

[0052] (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.

[0053] The crankshaft 17 penetrates vertically through the center of rotation of the rotor 52 and is connected to the rotor 52. The upper end of the crankshaft 17 is fitted into the upper bearing 26c of the movable scroll 26. Thus, 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.

[0054] 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 of the movable side plate 26a. The lower end of the main oil supply passage 61 communicates with the oil reservoir portion 10a.

[0055] 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 the sliding portion between the crankshaft 17 and the upper bearing 26c of the movable scroll 26. The second sub-oil supply passage 61b opens at the sliding portion between the crankshaft 17 and the upper bearing 32 of the housing 23. The third sub-oil supply passage 61c opens at the sliding portion between the crankshaft 17 and the lower bearing 60.

[0056] (1-8) Suction pipe 19 The suction pipe 19 is a pipe for introducing the refrigerant in 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.

[0057] (1-9) Discharge pipe 20 The discharge pipe 20 is a pipe for discharging 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.

[0058] (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 orbits around the rotation axis 16a of the crankshaft 17. As a result, the movable scroll 26 orbits relative to the fixed scroll 24. During the orbiting of the movable scroll 26, the rotation of the movable scroll 26 is suppressed by the Oldham coupling 39.

[0059] (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 orbiting 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.

[0060] 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.

[0061] (2-2) Flow of lubricating oil When 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 a high-pressure state 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.

[0062] The lubricating oil flowing into the high-pressure space 71 from the first sliding portion and the second sliding portion returns to the oil reservoir portion 10a. A part of the lubricating oil flowing into the crank chamber 23a from the second sliding portion and the third sliding portion passes through the oil discharge passage 23b, flows into the high-pressure space 71, and returns to the oil reservoir portion 10a. Most of the lubricating oil flowing 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 flowing 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 portion 10a.

[0063] (3) Detailed Configuration Figures 6A to 6D show the changes in the state of the compression mechanism 15 while the movable scroll 26 is performing a turning motion. Figures 6A to 6D show the states 1A to 1D of the compression mechanism 15, respectively. 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 turning 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, ···.

[0064] As shown in FIGS. 6A to 6D, the compression mechanism 15 forms a first compression chamber 40a and a second compression chamber 40b as compression chambers 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 outer 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.

[0065] As shown in FIG. 3, the fixed-side oil groove 80 has a first end 80a located on the winding end side of the fixed-side wrap 24b. The first end 80a extends to the vicinity of the suction port 24d in the circumferential direction of the fixed scroll 24. The end opposite to the first end 80a extends to the vicinity of the first communication passage 24h in the circumferential direction of the fixed scroll 24.

[0066] FIG. 7 shows the change in the position of the second end 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 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 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 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 26f contacts the fixed-side wrap 24b at the first contact point P1. In state 1C, the second end 26f contacts the outer peripheral wall 24c at the second contact point P2.

[0067] FIG. 8 shows the change in the state of the compression mechanism 15 while the movable scroll 26 makes one full rotation with respect to the fixed scroll 24. In FIG. 8, 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 each of the states 1A to 1D are shown. 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 with respect to the fixed scroll 24. Therefore, in FIG. 8, the angular position of the movable scroll 26 during rotation increases counterclockwise.

[0068] 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.

[0069] When the movable scroll 26 rotates and shifts from state 1A to state 1B, the second end portion 26f separates from the fixed-side wrap 24b.

[0070] 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 or the fixed-side wrap 24b.

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

[0072] 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.

[0073] When the movable scroll 26 rotates and shifts from state 1C to state 1D, the second end portion 26f separates from the outer peripheral wall 24c.

[0074] 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 26f of the movable-side wrap 26b does not contact the outer peripheral wall 24c and the fixed-side wrap 24b.

[0075] When the movable scroll 26 rotates and shifts from state 1D to state 1A, the second end 26f contacts the fixed-side wrap 24b.

[0076] As shown in FIG. 8, the angular regions in which the compression mechanism 15 is in state 1A and state 1C include only a specific one angle. The angular region in which the compression mechanism 15 is in state 1A is 0°. The angular region in which the compression mechanism 15 is in state 1C is 180°.

[0077] (4) Features In the first embodiment, the fixed-side oil groove 80 of the fixed scroll 24 extends in the circumferential direction of the fixed scroll 24 to a position closer to the suction port 24d than the first line segment L1. Therefore, as shown in FIGS. 6C and 6D, in states 1C and 1D, the fixed-side oil groove 80 has a first end 80a located outside the second compression chamber 40b in the radial direction of the fixed scroll 24. The radial direction of the fixed scroll 24 is the radial direction of the circular main surface of the fixed-side mirror plate 24a.

[0078] The compression chamber 40 communicating with the suction port 24d is filled with the refrigerant before compression. Therefore, while the movable scroll 26 is performing a turning motion, the pressure in the fixed-side oil groove 80 communicating with the high-pressure space 71 is higher than the pressure in the second compression chamber 40b communicating with the suction port 24d in states 1C and 1D. Also, the second compression chamber 40b in states 1C and 1D is located in the radial direction of the fixed scroll 24 in the vicinity of the fixed-side oil groove 80. Therefore, due to the pressure difference between the fixed-side oil groove 80 and the second compression chamber 40b, the lubricating oil supplied to the fixed-side oil groove 80 is supplied to the second compression chamber 40b communicating with the suction port 24d via the first thrust surface 24e. In other words, the lubricating oil supplied from the vicinity of the first end portion 80a of the fixed-side oil groove 80 to the first thrust surface 24e flows into the second compression chamber 40b communicating with the suction port 24d.

[0079] In a conventional scroll compressor, in the circumferential direction of the fixed scroll, the fixed-side oil groove does not extend to the vicinity of the suction port, so lubricating oil is not sufficiently supplied from the fixed-side oil groove to the second compression chamber, and there has been a problem that leakage of the refrigerant from the second compression chamber is not sufficiently suppressed.

[0080] In the first embodiment, on the outer peripheral wall 24c of the fixed scroll 24, a fixed-side oil groove 80 is formed that extends in the circumferential direction of the fixed scroll 24 to a position closer to the suction port 24d than the first line segment L1. Therefore, the fixed scroll 24 has a fixed-side oil groove 80 that can sufficiently supply lubricating oil to the second compression chamber 40b. Accordingly, the scroll compressor 101 has an effect of suppressing leakage of the refrigerant from the second compression chamber 40b.

[0081] In addition, the first compression chamber 40a in the state 1A and the state 1B is located in the radial direction of the fixed scroll 24 near the fixed-side oil groove 80. Therefore, due to the pressure difference between the fixed-side oil groove 80 and the first compression chamber 40a, the lubricating oil supplied to the fixed-side oil groove 80 is supplied to the first compression chamber 40a communicating with the suction port 24d through the first thrust surface 24e. In other words, the lubricating oil supplied from the vicinity of the first end 80a of the fixed-side oil groove 80 to the first thrust surface 24e flows into the first compression chamber 40a communicating with the suction port 24d. Therefore, the scroll compressor 101 has an effect of suppressing the leakage of the refrigerant from the first compression chamber 40a.

[0082] In addition, the scroll compressor 101 has an effect of improving the efficiency of the refrigeration device 1 by suppressing the leakage of the refrigerant from the first compression chamber 40a and the second compression chamber 40b.

[0083] <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.

[0084] In the second embodiment, as shown in FIG. 9, a first movable-side oil groove 81 is formed on the upper surface of the movable scroll 26, which is the second thrust surface 26e that slides on the outer peripheral wall 24c of the fixed scroll 24. 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 first compression chamber 40a or 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.

[0085] The first movable-side oil groove 81 communicates with the fixed-side oil groove 80 and at the same time communicates with the first compression chamber 40a or the second compression chamber 40b in a predetermined section of the angular region where the movable scroll 26 rotates. In this predetermined section, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first movable-side oil groove 81 and is supplied to the first compression chamber 40a or 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.

[0086] Figures 10A to 10E show the changes in the state of the compression mechanism 15 while the movable scroll 26 is undergoing a turning motion. Figures 10A to 10E respectively show the states 2A to 2E 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 2A, state 2B, state 2C, state 2D, state 2E, state 2A, state 2B, ···

[0087] 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 10A to 10E 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.

[0088] Figure 11 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. Figure 11 shows 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 2A to 2E in the angular range of 0° to 360° for one full turn of the movable scroll 26.

[0089] In state 2A, as shown in Figure 10A, the first movable-side oil groove 81 communicates with both the fixed-side oil groove 80 and the first compression chamber 40a. The first movable-side oil groove 81 does not communicate with the second compression chamber 40b. In state 2A, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first movable-side oil groove 81 and is supplied to the first compression chamber 40a.

[0090] When the movable scroll 26 rotates and transitions from state 2A to state 2B, the first movable-side oil groove 81 ceases to communicate with the fixed-side oil groove 80.

[0091] In state 2B, as shown in FIG. 10B, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80 and communicates with the first compression chamber 40a. The first movable-side oil groove 81 does not communicate with the second compression chamber 40b. In state 2B, lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0092] When the movable scroll 26 rotates and transitions from state 2B to state 2C, the first movable-side oil groove 81 ceases to communicate with the first compression chamber 40a and the second compression chamber 40b.

[0093] In state 2C, as shown in FIG. 10C, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80, the first compression chamber 40a, and the second compression chamber 40b. In state 2C, lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0094] When the movable scroll 26 rotates and transitions from state 2C to state 2D, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80.

[0095] In state 2D, as shown in FIG. 10D, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80 and does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 2D, the lubricating oil supplied to the fixed-side oil groove 80 is supplied to the first movable-side oil groove 81. Lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0096] When the movable scroll 26 rotates and transitions from state 2D to state 2E, the first movable-side oil groove 81 communicates with the second compression chamber 40b.

[0097] In state 2E, as shown in FIG. 10E, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80 and the second compression chamber 40b simultaneously. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. In state 2E, the lubricating oil supplied 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.

[0098] When the movable scroll 26 rotates and shifts from state 2E to state 2A, the second end portion 26f of the movable-side wrap 26b contacts the fixed-side wrap 24b, so that the first movable-side oil groove 81 no longer communicates with the second compression chamber 40b and communicates with the first compression chamber 40a.

[0099] (2) Features In the second embodiment, while the movable scroll 26 makes one full rotation with respect to the fixed scroll 24, the first movable-side oil groove 81 moves along the dotted circle shown in FIG. 12. FIG. 12 is an enlarged view of FIGS. 10A to 10E. In FIG. 12, the first movable-side oil grooves 81a to 81e respectively indicate the positions of the first movable-side oil groove 81 in states 2A to 2E. In state 2A, the fixed-side oil groove 80 directly communicates with the first compression chamber 40a via the first movable-side oil groove 81. In state 2E, the fixed-side oil groove 80 directly communicates with the second compression chamber 40b via the first movable-side oil groove 81.

[0100] 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 performing a swirling motion, the pressure in the fixed-side oil groove 80 that communicates with the high-pressure space 71 is higher than the pressures in the first compression chamber 40a and the second compression chamber 40b that communicate with the suction port 24d.

[0101] Therefore, in state 2E, due to the pressure difference between the fixed-side oil groove 80 and the second compression chamber 40b, the lubricating oil supplied 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 that communicates with the suction port 24d. Accordingly, the scroll compressor 101 has the effect of suppressing the leakage of the refrigerant from the second compression chamber 40b.

[0102] Also, in the state 2A, due to the pressure difference between the fixed-side oil groove 80 and the first compression chamber 40a, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first movable-side oil groove 81 and is supplied to the first compression chamber 40a communicating with the suction port 24d. Therefore, the scroll compressor 101 has an effect of suppressing the leakage of the refrigerant from the first compression chamber 40a.

[0103] <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 first embodiment. Hereinafter, the description will focus on the differences from the first embodiment.

[0104] In the third embodiment, as shown in FIG. 13, on the upper surface of the movable scroll 26, a second thrust surface 26e that slides on the outer peripheral wall 24c of the fixed scroll 24 is formed with a first movable-side oil groove 81. 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 first compression chamber 40a or 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.

[0105] The first movable-side oil groove 81 communicates with the fixed-side oil groove 80 in the first section S1 of the angular region where the movable scroll 26 rotates, and does not communicate with the first compression chamber 40a and the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80 and communicates with the first compression chamber 40a or the second compression chamber 40b in the second section S2 of the angular region where the movable scroll 26 rotates. The second section S2 is an angular region that does not overlap with the first section S1.

[0106] The first movable-side oil groove 81 communicates with the fixed-side oil groove 80 in the first section S1. In the first section S1, the lubricating oil supplied to the fixed-side oil groove 80 is supplied to the first movable-side oil groove 81.

[0107] The first movable-side oil groove 81 communicates with the first compression chamber 40a or the second compression chamber 40b at a position closer to the suction port 24d than the first line segment L1 in the second section S2. The lubricating oil supplied to the first movable-side oil groove 81 in the first section S1 is supplied to the first compression chamber 40a or 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 in the second section S2.

[0108] Figures 14A to 14G show the changes in the state of the compression mechanism 15 while the movable scroll 26 is performing a turning motion. Figures 14A to 14G respectively show the states 3A to 3G 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 cycle in the order of state 3A, state 3B, state 3C, state 3D, state 3E, state 3F, state 3G, state 3A, state 3B, ···

[0109] 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 14G 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 third embodiment.

[0110] 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. Figure 15 shows 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 3G in the angular range of 0° to 360° during which the movable scroll 26 makes one full turn. Figure 15 shows the first section S1 and the second section S2. The first section S1 corresponds to the section in which the state of the compression mechanism 15 is state 3C or state 3E. The second section S2 corresponds to the section in which the state of the compression mechanism 15 is state 3A or state 3G.

[0111] In state 3A, as shown in FIG. 14A, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80 and communicates with the first compression chamber 40a. The first movable-side oil groove 81 does not communicate with the second compression chamber 40b. In state 3A, the lubricating oil in the first movable-side oil groove 81 is supplied to the first compression chamber 40a.

[0112] When the movable scroll 26 rotates and shifts from state 3A to state 3B, the first movable-side oil groove 81 no longer communicates with the first compression chamber 40a.

[0113] In state 3B, as shown in FIG. 14B, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80, the first compression chamber 40a, and the second compression chamber 40b. In state 3B, no lubricating oil is supplied to the first compression chamber 40a and the second compression chamber 40b.

[0114] When the movable scroll 26 rotates and shifts from state 3B to state 3C, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80.

[0115] In state 3C, as shown in FIG. 14C, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80 and does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 3C, the lubricating oil supplied to the fixed-side oil groove 80 is supplied to the first movable-side oil groove 81. No lubricating oil is supplied to the first compression chamber 40a and the second compression chamber 40b.

[0116] When the movable scroll 26 rotates and shifts from state 3C to state 3D, the first movable-side oil groove 81 no longer communicates with the fixed-side oil groove 80.

[0117] In state 3D, as shown in FIG. 14D, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80, the first compression chamber 40a, and the second compression chamber 40b. In state 3D, no lubricating oil is supplied to the first compression chamber 40a and the second compression chamber 40b.

[0118] When the movable scroll 26 rotates and shifts from state 3D to state 3E, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80.

[0119] In state 3E, as shown in FIG. 14E, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80 and does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 3E, the lubricating oil supplied to the fixed-side oil groove 80 is supplied to the first movable-side oil groove 81. No lubricating oil is supplied to the first compression chamber 40a and the second compression chamber 40b.

[0120] When the movable scroll 26 rotates and shifts from state 3E to state 3F, the first movable-side oil groove 81 no longer communicates with the fixed-side oil groove 80.

[0121] In state 3F, as shown in FIG. 14F, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80, the first compression chamber 40a, and the second compression chamber 40b. In state 3F, no lubricating oil is supplied to the first compression chamber 40a and the second compression chamber 40b.

[0122] When the movable scroll 26 rotates and shifts from state 3F to state 3G, the first movable-side oil groove 81 communicates with the second compression chamber 40b.

[0123] In state 3G, as shown in FIG. 14G, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80 and communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. In state 3G, the lubricating oil in the first movable-side oil groove 81 is supplied to the second compression chamber 40b.

[0124] When the movable scroll 26 rotates and shifts from state 3G to state 3A, the second end portion 26f of the movable-side wrap 26b contacts the fixed-side wrap 24b, whereby the first movable-side oil groove 81 no longer communicates with the second compression chamber 40b and communicates with the first compression chamber 40a.

[0125] (2) Features In the third embodiment, while the movable scroll 26 makes one full rotation with respect to the fixed scroll 24, the first movable-side oil groove 81 moves along the dotted circle shown in FIG. 16. FIG. 16 is an enlarged view of FIGS. 14A to 14G. In FIG. 16, the first movable-side oil grooves 81a to 81g respectively indicate the positions of the first movable-side oil groove 81 in states 3A to 3G. In states 3C and 3E, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80. In state 3A, the first movable-side oil groove 81 communicates with the first compression chamber 40a. In state 3G, the first movable-side oil groove 81 communicates with the second compression chamber 40b.

[0126] 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 performing a turning 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. Also, in states 3C and 3E, the high-pressure lubricating oil supplied to the fixed-side oil groove 80 is supplied to the first movable-side oil groove 81. As a result, in states 3C and 3E, the pressure in the first movable-side oil groove 81 becomes the same as the pressure in the fixed-side oil groove 80.

[0127] Therefore, in state 3G, due to the pressure difference between the first movable-side oil groove 81 and the second compression chamber 40b, the lubricating oil supplied to the first movable-side oil groove 81 is supplied to the second compression chamber 40b that communicates with the suction port 24d. Accordingly, the scroll compressor 101 has the effect of suppressing the leakage of the refrigerant from the second compression chamber 40b.

[0128] Also, in state 3A, due to the pressure difference between the first movable-side oil groove 81 and the first compression chamber 40a, the lubricating oil supplied to the first movable-side oil groove 81 is supplied to the first compression chamber 40a that communicates with the suction port 24d. Accordingly, the scroll compressor 101 has the effect of suppressing the leakage of the refrigerant from the first compression chamber 40a.

[0129] <Fourth Embodiment> (1) Configuration The scroll compressor 101 of the fourth embodiment is basically the same in configuration and operation as the scroll compressor 101 of the first embodiment. Hereinafter, the description will focus on the differences from the first embodiment.

[0130] In the fourth embodiment, as shown in FIG. 17, on the upper surface of the movable scroll 26, a second thrust surface 26e that slides on the outer peripheral wall 24c of the fixed scroll 24 is formed with a first movable-side oil groove 81 and a second movable-side oil groove 82.

[0131] 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.

[0132] 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. 17, 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. 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 radial direction of the movable scroll 26 is the radial direction of the circular main surface of the movable-side mirror plate 26a.

[0133] The first movable-side oil groove 81 communicates with the second compression chamber 40b in the third section S3 of the angular region where the movable scroll 26 rotates. The second movable-side oil groove 82 communicates with the first compression chamber 40a in the fourth section S4 of the angular region where the movable scroll 26 rotates. The third section S3 is an angular region that does not overlap with the fourth section S4.

[0134] The first movable-side oil groove 81 communicates with the fixed-side oil groove 80 in the third section S3 and, at the same time, communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a in the third section S3. In the third section S3, the lubricating oil supplied 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 that communicates with the suction port 24d at a position closer to the suction port 24d than the first line segment L1.

[0135] The second movable-side oil groove 82 communicates with the fixed-side oil groove 80 in the fourth section S4 and, at the same time, communicates with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the second compression chamber 40b in the fourth section S4. In the fourth section S4, the lubricating oil supplied 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 that communicates with the suction port 24d.

[0136] Figures 18A to 18G show changes in the state of the compression mechanism 15 while the movable scroll 26 is performing a turning motion. Figures 18A to 18G respectively show states 4A to 4G 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 cycle in the order of state 4A, state 4B, state 4C, state 4D, state 4E, state 4F, state 4G, state 4A, state 4B, ···.

[0137] 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 18A to 18G 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 fourth embodiment.

[0138] FIG. 19 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 FIG. 19, 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 1A to 1D and the states 4A to 4G are shown. FIG. 19 shows the third section S3 and the fourth section S4. The third section S3 corresponds to the section where the state of the compression mechanism 15 is state 4D or state 4E. The fourth section S4 corresponds to the section where the state of the compression mechanism 15 is state 4B.

[0139] In state 4A, as shown in FIG. 18A, 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 fixed-side oil groove 80 and the second compression chamber 40b. The second movable-side oil groove 82 communicates with the fixed-side oil groove 80. 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 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.

[0140] 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.

[0141] In state 4B, as shown in FIG. 18B, 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 fixed-side oil groove 80 and the second compression chamber 40b. The second movable-side oil groove 82 communicates with the fixed-side oil groove 80 and 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 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.

[0142] 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.

[0143] In state 4C, as shown in FIG. 18C, 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 fixed-side oil groove 80 and the second compression chamber 40b. The second movable-side oil groove 82 communicates with the fixed-side oil groove 80. 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 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.

[0144] When the movable scroll 26 rotates and shifts from state 4C to state 4D, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80. 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.

[0145] In state 4D, as shown in FIG. 18D, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80 and 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 communicates with the fixed-side oil groove 80. 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 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. No lubricating oil is supplied to the first compression chamber 40a.

[0146] When the movable scroll 26 rotates and shifts from state 4D to state 4E, the second movable-side oil groove 82 no longer communicates with the fixed-side oil groove 80.

[0147] In state 4E, as shown in FIG. 18E, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80 and 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 fixed-side oil groove 80, the first compression chamber 40a, and the second compression chamber 40b. In state 4E, the lubricating oil supplied 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. No lubricating oil is supplied to the first compression chamber 40a.

[0148] When the movable scroll 26 rotates and shifts from state 4E to state 4F, the first movable-side oil groove 81 ceases to communicate with the fixed-side oil groove 80.

[0149] In state 4F, as shown in Fig. 18F, 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 fixed-side oil groove 80 and the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the fixed-side oil groove 80, the first compression chamber 40a, and the second compression chamber 40b. In state 4F, lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0150] When the movable scroll 26 rotates and shifts from state 4F to state 4G, the second movable-side oil groove 82 communicates with the fixed-side oil groove 80.

[0151] In state 4G, as shown in Fig. 18G, 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 fixed-side oil groove 80 and the first compression chamber 40a. The second movable-side oil groove 82 communicates with the fixed-side oil groove 80. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a and the second compression chamber 40b. In state 4G, the lubricating oil supplied to the fixed-side oil groove 80 is supplied to the second movable-side oil groove 82. Lubricating oil is not supplied to the first compression chamber 40a and the second compression chamber 40b.

[0152] When the movable scroll 26 rotates and shifts from state 4G to state 4A, the second end portion 26f of the movable-side wrap 26b contacts the fixed-side wrap 24b, whereby the first movable-side oil groove 81 ceases to communicate with the second compression chamber 40b and communicates with the first compression chamber 40a.

[0153] (2) Features In the fourth embodiment, while the movable scroll 26 makes one full rotation with respect to the fixed scroll 24, in state 4B, the fixed-side oil groove 80 directly communicates with the first compression chamber 40a via the second movable-side oil groove 82. In states 4D and 4E, the fixed-side oil groove 80 directly communicates with the second compression chamber 40b via the first movable-side oil groove 81.

[0154] The first compression chamber 40a and the second compression chamber 40b communicating with the suction port 24d are filled with refrigerant before compression. Therefore, while the movable scroll 26 is making a swirling motion, the pressure in the fixed-side oil groove 80 communicating with the high-pressure space 71 is higher than the pressures in the first compression chamber 40a and the second compression chamber 40b communicating with the suction port 24d.

[0155] Therefore, in states 4D and 4E, due to the pressure difference between the fixed-side oil groove 80 and the second compression chamber 40b, the lubricating oil supplied 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 communicating with the suction port 24d. Accordingly, the scroll compressor 101 has the effect of suppressing the leakage of refrigerant from the second compression chamber 40b.

[0156] Also, 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 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. Accordingly, the scroll compressor 101 has the effect of suppressing the leakage of refrigerant from the first compression chamber 40a.

[0157] Furthermore, as shown in FIG. 19, a third section S3 where lubricating oil is supplied to the second compression chamber 40b and a fourth section S4 where lubricating oil is supplied to the first compression chamber 40a do not overlap with each other. In other words, while the movable scroll 26 is making a swirling motion, lubricating oil is not simultaneously supplied to the first compression chamber 40a and the second compression chamber 40b. If lubricating oil is simultaneously supplied to the first compression chamber 40a and the second compression chamber 40b, the supply amount of lubricating oil to the first compression chamber 40a will be different from the supply amount of lubricating oil to the second compression chamber 40b, and there is a possibility that the first compression chamber 40a or the second compression chamber 40b will not be sufficiently supplied with lubricating oil. Accordingly, the scroll compressor 101 has the effect of suppressing the leakage of refrigerant from the first compression chamber 40a and the second compression chamber 40b.

[0158] <Modification Example> (1) Modification Example A In the second to fourth embodiments, the first movable-side oil groove 81 has a linear shape extending in a predetermined direction. The shape of the first movable-side oil groove 81 is not limited to a linear shape.

[0159] For example, as shown in FIGS. 20A and 20B, the first movable-side oil groove 81 may have an extension portion 91 extending in the circumferential direction of the movable scroll 26. FIGS. 20A and 20B are enlarged views similar to FIGS. 12 and 16.

[0160] The first movable-side oil groove 81 shown in FIG. 20A 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 portion of the extension portion 91.

[0161] The first movable-side oil groove 81 shown in FIG. 20B 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.

[0162] The extension portion 91 extends in the circumferential direction which is the turning 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 turning motion of the movable scroll 26. Accordingly, the first movable-side oil groove 81 having the extension portion 91 has an effect of promoting oil supply to the first thrust surface 24e and the second thrust surface 26e.

[0163] The oil supply portion 92 extends in the radial direction from the first movable-side oil groove 81 toward the compression chamber 40. Therefore, the oil supply portion 92 lengthens the period during which the first movable-side oil groove 81 communicates with the compression chamber 40 while the movable scroll 26 is turning. Accordingly, the first movable-side oil groove 81 having the oil supply portion 92 has an effect of promoting oil supply to the compression chamber 40.

[0164] Also, by changing the position of the oil supply portion 92 in the circumferential direction, the position where the first movable-side oil groove 81 communicates with the compression chamber 40 can be adjusted. For example, by providing the oil supply portion 92 at a position closer to the suction port 24d in the circumferential direction, lubricating oil can be supplied to the compression chamber 40 at a position closer to the suction port 24d.

[0165] (2) Variation B In the first embodiment, the fixed side oil groove 80 extends in the circumferential direction to a position closer to the suction port 24d than the first line segment L1. The fixed side oil groove 80 may extend in the circumferential direction to the position of the suction port 24d.

[0166] Although the embodiments of the present disclosure have been described above, 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 symbols]

[0167] 1: Refrigeration equipment 24: Fixed scroll 24a: Fixed side mirror plate (first mirror plate) 24b: Fixed side wrap (first wrap) 24c: Outer wall 24d: Intake port 24e: First thrust surface (first surface) 24f: Oil passage 26: Movable scroll 26a: Movable side mirror plate (second mirror plate) 26b: Movable wrap (second wrap) 26e: Second thrust surface (second surface) 26f: 2nd end 40a: First compression chamber 40b: Second compression chamber 80: Fixed side oil groove (1st oil groove) 80a: 1st end 81: 1st movable side oil groove (2nd oil groove) 82: 2nd movable side oil groove (3rd oil groove) 91 :Extension part S1: First section S2: Second section S3: Third section S4: The fourth section 100: Refrigerant circuit 101:Scroll compressor L1: First line segment P1: 1st contact point P2: 2nd contact point

Prior Art Documents

Patent Documents

[0168]

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; 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 to supply oil to the first oil groove, and a suction port (24d) that opens near the end of the first wrap, During orbit of the movable scroll, a second end (26e) on the winding end side of the second wrap contacts the first wrap at a first contact point (P1) and contacts the outer peripheral wall at a second contact point (P2); a first end (80a) of the first oil groove, located on the winding end side of the first wrap, extends in the circumferential direction to a position closer to the suction port than a first line segment (L1) connecting the first contact point and the second contact point, The fixed scroll and the movable scroll form a first compression chamber (40a) formed on the outer side of the second wrap and a second compression chamber (40b) formed on the inner side of the second wrap, A second oil groove (81) is provided on a second surface (26e) of the second end plate that slides against the outer circumferential wall, the second oil groove communicates with the first oil groove during orbital movement of the movable scroll, and communicates with the first compression chamber or the second compression chamber at a position closer to the suction port than the first line segment; The first oil groove extends along the inner circumferential surface of the outer circumferential wall outside the first line segment. Scroll compressor (101).

2. the second oil groove communicates with the second compression chamber and supplies oil to the second compression chamber during a predetermined period including a time point at which the second wrap contacts the outer peripheral wall during orbital of the movable scroll; 2. The scroll compressor according to claim 1.

3. The second oil groove communicates with the first oil groove and with the first compression chamber or the second compression chamber in a predetermined section of an angular region in which the movable scroll orbits. The scroll compressor according to claim 1 or 2.

4. The second 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 groove and does not communicate with the first compression chamber and the second compression chamber, In a second section (S2) of an angular region in which the movable scroll orbits, the movable scroll communicates with the first compression chamber or the second compression chamber, but does not communicate with the first oil groove; The first section and the second section do not overlap with each other. The scroll compressor according to claim 1 or 2.

5. The second surface is further provided with a third oil groove (82), the third oil groove communicates with the first oil groove and the first compression chamber during orbital movement of the movable scroll, the second oil groove communicates with the second compression chamber in a third section (S3) of an angular region in which the movable scroll orbits, the third oil groove communicates with the first compression chamber in a fourth section (S4) of an angular region in which the movable scroll orbits, the third section and the fourth section do not overlap with each other; The scroll compressor according to claim 1 or 2.

6. The second oil groove has an extension portion (91) extending in the circumferential direction. The scroll compressor according to claim 1 or 2.

7. A scroll compressor (101) according to claim 1 or 2; a refrigerant circuit (100) through which a refrigerant compressed by the scroll compressor flows; Equipped with Refrigeration device (1).

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