Scroll compressor and refrigerating device

Abstract

There is a problem that leakage of a refrigerant from a compression chamber formed inside a lap of a movable scroll and in which a refrigerant is compressed may not be sufficiently suppressed. A scroll compressor (101) comprises a fixed scroll (24) and a movable scroll (26). On an outer circumferential wall (24c) of the fixed scroll (24), a fixed-side oil groove (80) extending in the circumferential direction is provided on a first thrust surface (24e) that slides with a movable-side end plate (26a). The fixed scroll (24) is provided with an oil passage (24f) that supplies oil to the fixed-side oil groove (80), and a suction port (24d) that opens near the winding end of a fixed-side wrap (24b). During turning of the movable scroll (26), a second end (26f) on the winding end side of a movable-side wrap (26b) is in contact with the fixed-side wrap (24b) at a first contact point (P1), and is in contact with the outer circumferential wall (24c) at a second contact point (P2). A 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

Scroll compressor and refrigeration device

[0001] The present invention relates to a scroll compressor and a refrigeration device.

[0002] As disclosed in Patent Document 1 (JP 2016-160816 A), a scroll compressor has been known in which a fixed-side oil groove is formed in the end face of the outer peripheral wall of the fixed scroll and a movable-side oil groove is formed in the end plate on the outer side of the wrap of the movable scroll. High-pressure lubricating oil is supplied to the fixed-side oil groove. During orbital movement 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. Furthermore, during orbital movement 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, in which refrigerant is compressed, and the lubricating oil in the movable-side oil groove is supplied to the outer compression chamber.

[0003] In the scroll compressor of Patent Document 1 (JP 2016-160816 A), while the movable scroll is orbiting, the movable oil groove does not communicate with the inner compression chamber formed on the inner side of the wrap of the movable scroll, where the refrigerant is compressed. As a result, the lubricating oil in the movable oil groove is not sufficiently supplied to the inner compression chamber, and there is a risk that refrigerant leakage from the inner compression chamber may not be sufficiently suppressed.

[0004] A scroll compressor according to a first aspect includes a fixed scroll and a movable scroll. The fixed scroll has a first end plate, an outer peripheral wall extending from the outer edge of the first end plate, and a first spiral wrap extending from the first end plate inside the outer peripheral wall. The movable scroll has a second end plate and a second spiral wrap extending from the second end plate. A first surface of the outer peripheral wall that slides against the second end plate is provided with a first oil groove extending in the circumferential direction. 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 first wrap. During orbital movement of the movable scroll, a second end of the second wrap on the end-of-winding side contacts the first wrap at a first contact point and contacts the outer peripheral wall at a second contact point. A first end 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 intake port than a first line segment connecting the first contact point and the second contact point.

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

[0006] A scroll compressor according to a second aspect is the scroll compressor according to the first aspect, wherein the fixed scroll and the movable scroll define 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 end plate that slides against the outer circumferential wall. The second oil groove communicates with the first oil groove during orbiting 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 orbiting of the movable scroll.

[0007] In the scroll compressor of the second aspect, oil grooves are provided in the fixed scroll and the movable scroll to sufficiently supply lubricating oil to the compression chamber inside the wrap of the movable scroll, thereby suppressing leakage of refrigerant from the compression chamber.

[0008] A scroll compressor of a third aspect is the scroll compressor of the second aspect, wherein the second oil groove is in communication with the second compression chamber and supplies oil to the second compression chamber during a predetermined period including the time when the second wrap contacts the outer wall during rotation of the movable scroll.

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

[0010] A scroll compressor of a fourth aspect is the scroll compressor of the second or third aspect, wherein the second oil groove communicates with the first oil groove and simultaneously communicates with the first compression chamber or the second compression chamber in a predetermined section of the angular region in which the movable scroll orbits.

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

[0012] A scroll compressor according to a 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 a first section of an angular range in which the orbiting scroll orbits, but does not communicate with the first or second compression chamber, and the second oil groove communicates with the first or second compression chamber in a second section of the angular range in which the orbiting scroll orbits, but does not communicate with the first oil groove, and the first section and the second section do not overlap each other.

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

[0014] A scroll compressor according to a sixth aspect is the scroll compressor according to any one of the second to fifth aspects, further comprising a third oil groove provided in the second surface. The third oil groove communicates with the first oil groove and the first compression chamber during orbiting of the movable scroll. The second oil groove communicates with the second compression chamber in a third section of the angular range in which the movable scroll orbits. The third oil groove communicates with the first compression chamber in a fourth section of the angular range in which the movable scroll orbits. The third section and the fourth section do not overlap with each other.

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

[0016] A scroll compressor according to a seventh aspect is the scroll compressor according to any one of the first to sixth aspects, wherein 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] A refrigeration system according to an eighth aspect includes the scroll compressor according to any one of the first to seventh aspects, and a refrigerant circuit through which refrigerant compressed by the scroll compressor flows.

[0019] The refrigeration system of the eighth aspect can improve efficiency by suppressing leakage of refrigerant from the compression chamber of the scroll compressor.

[0020] FIG. 1 is a refrigerant circuit diagram of a refrigeration device 1 of a first embodiment. FIG. 2 is a longitudinal sectional view of a scroll compressor 101 of a first embodiment. FIG. 3 is a bottom view of a fixed scroll 24 of a first embodiment. FIG. 4 is a top view of a movable scroll 26 of a first embodiment. FIG. 5 is a perspective view of an Oldham coupling 39 of a first embodiment. FIG. 6 is a view showing a state 1A of a compression mechanism 15 of a first embodiment. FIG. 7 is a view showing a state 1B of a compression mechanism 15 of a first embodiment. FIG. 8 is a view showing a state 1C of a compression mechanism 15 of a first embodiment. FIG. 9 is a view showing a state 1D of a compression mechanism 15 of a first embodiment. FIG. 10 is a view for explaining the position of a first end 80a of a fixed-side oil groove 80 of a first embodiment. FIG. 11 is a view showing changes in a state of the compression mechanism 15 of a first embodiment. FIG. 12 is a top view of a movable scroll 26 of a second embodiment. FIG. 13 is a view showing a state 2A of a compression mechanism 15 of a second embodiment. FIG. 14 is a view showing a state 2B of a compression mechanism 15 of a second embodiment. FIG. 15 is a view showing a state 2C of a compression mechanism 15 of a second embodiment. FIG. 16 is a view showing a state 2D of a compression mechanism 15 of a second embodiment. FIG. 17 is a view showing a state 2E of a compression mechanism 15 of a second embodiment. 3A is a diagram showing a trajectory of the first movable-side oil groove 81 of the second embodiment. FIG. 3B is a diagram showing a state 3C of the compression mechanism 15 of the third embodiment. FIG. 3D is a diagram showing a state 3E of the compression mechanism 15 of the third embodiment. FIG. 3F is a diagram showing a state 3G of the compression mechanism 15 of the third embodiment. FIG. 3G is a diagram showing a change in the state of the compression mechanism 15 of the third embodiment. FIG. 3C is a diagram showing a trajectory of the first movable-side oil groove 81 of the third embodiment. FIG. 3D is a diagram showing a state 3E of the compression mechanism 15 of the third embodiment. FIG. 3F is a diagram showing a state 3G of the compression mechanism 15 of the third embodiment. FIG. 3E is a diagram showing a state 3F of the compression mechanism 15 of the third embodiment. FIG. 3G is a diagram showing a change in the state of the compression mechanism 15 of the third embodiment. FIG. 3F is a diagram showing a state 3G of the compression mechanism 15 of the third embodiment. FIG. 3E is a diagram showing a trajectory of the first movable-side oil groove 81 of the third embodiment. FIG. 3F is a diagram showing a state 4A of the compression mechanism 15 of the fourth embodiment. FIG. 3B is a diagram showing a state 4C of the compression mechanism 15 of the fourth embodiment. FIG. 3C is a diagram showing a state 4D of the compression mechanism 15 of the fourth embodiment. FIG. 3E is a diagram showing a state 4E of the compression mechanism 15 of the fourth embodiment. 4A and 4B are diagrams illustrating a state 4F of the compression mechanism 15 of the fourth embodiment, a state 4G of the compression mechanism 15 of the fourth embodiment, and changes in the state of the compression mechanism 15 of the fourth embodiment.10A and 10B are diagrams showing the shape of a first movable-side oil groove 81 in Modification A. FIG. 10B are diagrams showing the shape of a first movable-side oil groove 81 in Modification A. FIG.

[0021] <First Embodiment> (1) Overall Configuration As shown in Fig. 1 , a scroll compressor 101 is provided in a refrigeration system 1. The refrigeration system 1 is, for example, an air conditioning system. The refrigeration system 1 includes a refrigerant circuit 100 filled with a refrigerant. The refrigerant circuit 100 includes the scroll compressor 101, a radiator 2, a pressure reduction mechanism 3, and a heat absorber 4. The radiator 2 and the heat absorber 4 are heat exchangers. The pressure reduction mechanism 3 is, for example, an expansion valve. The refrigerant circuit 100 performs a vapor compression refrigeration cycle.

[0022] The refrigerant charged into 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 so that the longitudinal direction of the body casing portion 11 is aligned vertically.

[0025] The casing 10 accommodates a compression mechanism 15, a housing 23, an Oldham coupling 39, a motor 16, a lower bearing 60, and a crankshaft 17. An intake pipe 19 and a discharge pipe 20 are hermetically welded to the casing 10.

[0026] An oil reservoir 10a, which is a space for storing lubricating oil, is formed at the bottom of the internal space of the casing 10. The lubricating oil is refrigerating machine oil used to maintain good lubrication of the compression mechanism 15, crankshaft 17, etc. during operation of the scroll compressor 101. When the refrigerant is carbon dioxide, the pressure in the internal space of the casing 10 increases, increasing the force of contact between the sliding parts of the scroll compressor 101, so it is preferable to actively supply lubricating oil to the sliding parts.

[0027] (1-2) Compression Mechanism 15 The compression mechanism 15 draws in and compresses low-temperature, low-pressure refrigerant gas, and discharges high-temperature, 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 circumferential surface of the casing 10. The movable scroll 26 performs an orbital motion, revolving relative to the fixed scroll 24.

[0028] As shown in FIG. 3 , the fixed scroll 24 has a fixed end plate 24a, a fixed end wrap 24b, and an outer peripheral wall 24c. The fixed end plate 24a has a disk shape. The fixed end wrap 24b has a spiral shape when viewed vertically. The outer peripheral wall 24c has a cylindrical shape when viewed vertically. The outer peripheral wall 24c is provided on the outer edge of the lower surface of the fixed end plate 24a. The fixed side wrap 24b is provided on the lower surface of the fixed side end plate 24a, inside the outer peripheral wall 24c. When viewed vertically, the fixed side wrap 24b extends from a winding start located in the center of the fixed side end plate 24a to a winding end connecting with the outer peripheral wall 24c. Two fixed side keyways 24g are formed on the lower surface of the outer peripheral wall 24c.

[0029] As shown in FIG. 4 , the movable scroll 26 has a movable side end plate 26 a, a movable side wrap 26 b, and an upper end bearing 26 c. The movable side end plate 26 a has a disk shape. The movable side wrap 26 b has a spiral shape when viewed vertically. The upper end bearing 26 c has a cylindrical shape. The movable side wrap 26 b is provided on the upper surface of the movable side end plate 26 a. The upper end bearing 26 c is provided in the center of the lower surface of the movable side end plate 26 a. When viewed vertically, the movable side wrap 26 b extends from the beginning of the winding, which is located in the center of the movable side end plate 26 a, to the end of the winding, which is located outside the movable side end plate 26 a. Two movable side keyways 26 d are formed on the lower surface of the movable side end plate 26 a.

[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 so that the fixed wrap 24b and the movable 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 end plate 26a of the movable scroll 26 faces the fixed scroll 24. While the movable scroll 26 orbits, the lower surface of the outer peripheral wall 24c slides against the upper surface of the movable end plate 26a.

[0031] A suction port 24d is formed in the fixed scroll 24. The suction port 24d opens near the end of the fixed-side wrap 24b. The downstream end of the suction pipe 19 is connected to the suction port 24d. The suction port 24d communicates with the compression chamber 40.

[0032] An enlarged recess 42, which is a cylindrical depression, is formed in the upper surface of the fixed side end plate 24a of the fixed scroll 24. The enlarged recess 42 is covered by 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 in the center of the fixed side end plate 24a. The discharge hole 41 is a hole that penetrates the fixed side end plate 24a in the vertical direction. The discharge hole 41 connects the compression chamber 40 and the enlarged recess 42.

[0033] A first refrigerant flow path (not shown) is formed in the fixed 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 a second refrigerant flow path of the housing 23 at the lower surface of the outer peripheral wall 24c.

[0034] 3, a fixed-side oil groove 80 is formed in the lower surface of the outer peripheral wall 24c of the fixed scroll 24, on a first thrust surface 24e that slides against the upper surface of the movable-side end plate 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 circumferential surface of the outer peripheral wall 24c. At least a portion of the fixed-side oil groove 80 has an arc shape.

[0035] An oil passage 24f is formed in the fixed scroll 24 to supply oil to the fixed-side oil groove 80. The oil passage 24f is formed inside the outer peripheral wall 24c. One end of the oil passage 24f opens into the interior of the fixed-side oil groove 80 and communicates with the fixed-side oil groove 80. The other end of the oil passage 24f opens to 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 in the lower surface of the outer peripheral wall 24c. An 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 located at a position that communicates 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 on the outer periphery of the movable end plate 26a of the movable scroll 26. The second communication passage 26h is a hole that vertically penetrates the movable end plate 26a. While the movable scroll 26 orbits, 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, which will be 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 airtightly 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 a 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, which is 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. The pressure of the refrigerant in the high pressure space 71 and the intermediate pressure space 72 presses the orbiting movable scroll 26 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 between the fixed scroll 24 and the housing 23. A second refrigerant flow path (not shown) is formed in the outer periphery of the housing 23. The second refrigerant flow path is a hole that vertically penetrates the outer periphery of the housing 23. The second refrigerant flow path communicates with the first refrigerant flow path of the fixed scroll 24 at the upper surface of the housing 23. The second refrigerant flow path communicates with the high-pressure space 71 at 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 recess called a crank chamber 23a is formed in 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 passes vertically through the housing 23 from the center of the bottom surface of the crank chamber 23a to the center of the lower surface of the housing 23. Hereinafter, a part of the housing 23 that surrounds the housing through-hole 31 will be referred to as an upper bearing 32. An annular groove 23g is formed in the outer periphery of the bottom surface of the crank chamber 23a.

[0042] An oil discharge passage 23b is formed in the housing 23, connecting the crank chamber 23a with the high-pressure space 71. 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] A housing oil supply passage 23c is formed in the housing 23 to supply lubricating oil to the compression mechanism 15. One end of the housing oil supply passage 23c opens to the annular groove 23g. The other end of the housing oil supply passage 23c opens to the outer periphery of the upper surface of the housing 23 and communicates with an oil passage 24f of the fixed scroll 24. A throttle mechanism (not shown) is disposed inside the housing oil supply passage 23c to reduce the pressure of the lubricating oil flowing through the housing oil supply passage 23c.

[0044] (1-4) Oldham Coupling 39 The Oldham coupling 39 is a member for suppressing rotation of the orbiting movable scroll 26. The Oldham coupling 39 is disposed in the intermediate pressure space 72 between the movable scroll 26 and the housing 23.

[0045] As shown in FIG. 5 , the Oldham coupling 39 has an annular main body 39a, a pair of first keys 39b, and a pair of second keys 39c. The first keys 39b and the second keys 39c protrude from the upper surface of the annular main body 39a. The first keys 39b are disposed within the fixed key grooves 24g of the fixed scroll 24. The second keys 39c are disposed within the movable key grooves 26d of the movable scroll 26. While the movable scroll 26 orbits, the first keys 39b reciprocate within the fixed key grooves 24g along the longitudinal direction of the fixed key grooves 24g. While the movable scroll 26 orbits, the second keys 39c reciprocate within the movable key grooves 26d along the longitudinal direction of the movable key grooves 26d. This suppresses rotation of the orbiting movable scroll 26.

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

[0048] 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.

[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 coupled 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 rotary shaft 16a. The rotary shaft 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 via 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 supports the crankshaft 17 rotatably.

[0052] (1-7) Crankshaft 17 The crankshaft 17 is disposed so that its axial direction is aligned with the vertical direction. The axis of the upper end of the crankshaft 17 is eccentric with respect to the axis of the remaining portion of the crankshaft 17 excluding the upper end. 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 passes vertically through the rotation center of the rotor 52 and is connected to the rotor 52. The upper end of the crankshaft 17 is fitted into the upper end bearing 26c of the movable scroll 26. This connects the crankshaft 17 to the movable scroll 26, so that 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] A main oil supply passage 61 is formed inside the crankshaft 17. 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 the space between the upper end surface of the crankshaft 17 and the lower surface of the movable-side end plate 26a. The lower end of the main oil supply passage 61 communicates with the oil reservoir 10a.

[0055] The crankshaft 17 has a first auxiliary oil supply passage 61a, a second auxiliary oil supply passage 61b, and a third auxiliary oil supply passage 61c branching off from the main oil supply passage 61. The first auxiliary oil supply passage 61a, the second auxiliary oil supply passage 61b, and the third auxiliary oil supply passage 61c extend horizontally. The first auxiliary oil supply passage 61a opens at the sliding portion between the crankshaft 17 and the upper end bearing 26c of the movable scroll 26. The second auxiliary oil supply passage 61b opens at the sliding portion between the crankshaft 17 and the upper bearing 32 of the housing 23. The third auxiliary 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 refrigerant from the refrigerant circuit from the outside of the casing 10 to the compression mechanism 15. The suction pipe 19 passes through the upper wall portion 12 of the casing 10. Inside the casing 10, an 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 passes through 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. The rotational movement of the crankshaft 17 causes the movable scroll 26 to orbit around the rotation axis 16a of the crankshaft 17. As a result, the movable scroll 26 orbits relative to the fixed scroll 24. While the movable scroll 26 orbits, its rotation is suppressed by the Oldham coupling 39.

[0059] (2-1) Refrigerant Flow The scroll compressor 101 compresses 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. The orbital motion of the movable scroll 26 reduces the volume of the compression chamber 40 to which the refrigerant before compression is supplied. Therefore, in the compression chamber 40, the refrigerant is compressed to become compressed refrigerant. During the process of compressing the refrigerant, the compression chamber 40 becomes an intermediate-pressure compression chamber 40.

[0060] The compressed refrigerant is discharged from the compression chamber 40 through the discharge hole 41 into the enlarged recess 42. The compressed refrigerant then 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 increases. As a result, the lubricating oil stored in the oil reservoir 10a of the high-pressure space 71 becomes high-pressure and rises up the main oil supply passage 61. The lubricating oil rising up 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. 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 that flows into the high-pressure space 71 from the first sliding portion and the second sliding portion returns to the oil reservoir 10a. A portion of the lubricating oil that flows 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 10a. Most of the lubricating oil that flows 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 flows into the compression chamber 40 is mixed into the compressed refrigerant in the form of tiny oil droplets, flows into the high-pressure space 71 together with the compressed refrigerant, and returns to the oil reservoir 10a.

[0063] (3) Detailed Configuration Figures 6A to 6D show changes in the state of the compression mechanism 15 while the movable scroll 26 is orbiting. Figures 6A to 6D show 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 bilaterally symmetrical with the shape of the movable scroll 26 shown in Figure 4, which is a top view. As the movable scroll 26 orbits, the states of the compression mechanism 15 are switched in a cyclical manner in the order of State 1A, State 1B, State 1C, State 1D, State 1A, State 1B, ...

[0064] 6A to 6D, the compression mechanism 15 defines a first compression chamber 40a and a second compression chamber 40b as the 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] 3, the fixed-side oil groove 80 has a first end 80a located at the end 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 the first end 80a extends to the vicinity of the first communication passage 24h in the circumferential direction of the fixed scroll 24.

[0066] Figure 7 shows the change in the position of the second end 26f of the movable wrap 26b on the winding end side during orbiting of the movable scroll 26. As shown in Figure 7, the first end 80a of the fixed 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 orbiting of the movable scroll 26, the second end 26f of the movable wrap 26b contacts the outer peripheral surface of the fixed wrap 24b at the first contact point P1. During orbiting of the movable scroll 26, the second end 26f of the movable 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 wrap 24b at the first contact point P1. In state 1C, the second end 26f contacts the outer peripheral wall 24c at a second contact point P2.

[0067] FIG. 8 shows the changes in the state of the compression mechanism 15 while the movable scroll 26 orbits once relative to the fixed scroll 24. FIG. 8 shows the angular regions in which the compression mechanism 15 is in states 1A to 1D within the angular region of 0° to 360° over which the movable scroll 26 orbits once. In FIG. 8, the angle at which the state switches 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 movable scroll 26 increases counterclockwise during orbit.

[0068] 6A, in State 1A, the suction port 24d communicates with the first compression chamber 40a but not with the second compression chamber 40b. In State 1A, the second end 26f of the movable-side wrap 26b does not contact the outer peripheral wall 24c but contacts the fixed-side wrap 24b.

[0069] When the movable scroll 26 orbits and transitions from state 1A to state 1B, the second end 26f moves away from the fixed side wrap 24b.

[0070] 6B, in State 1B, the suction port 24d communicates with the first compression chamber 40a but does not communicate with the second compression chamber 40b. In State 1B, the second end 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 orbits and transitions from state 1B to state 1C, the second end 26f comes into contact with the outer peripheral wall 24c.

[0072] 6C, in State 1C, the suction port 24d does not communicate with the first compression chamber 40a but communicates with the second compression chamber 40b. In State 1C, the second end 26f of the movable-side wrap 26b contacts the outer peripheral wall 24c but does not contact the fixed-side wrap 24b.

[0073] When the movable scroll 26 orbits and transitions from state 1C to state 1D, the second end 26f moves away from the outer peripheral wall 24c.

[0074] 6D, the suction port 24d does not communicate with the first compression chamber 40a but 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 orbits and transitions from state 1D to state 1A, the second end 26f comes into contact with the fixed-side wrap 24b.

[0076] 8, the angular region in which the compression mechanism 15 is in state 1A and state 1C includes only one specific 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 to a position closer to the suction port 24d than the first line segment L1 in the circumferential direction of the fixed scroll 24. Therefore, as shown in Figures 6C and 6D, in States 1C and 1D, the fixed-side oil groove 80 has a first end 80a that is 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 end plate 24a.

[0078] The compression chamber 40 communicating with the suction port 24d is filled with uncompressed refrigerant. Therefore, while the movable scroll 26 is orbiting, the pressure in the fixed 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. Furthermore, the second compression chamber 40b in States 1C and 1D is located near the fixed oil groove 80 in the radial direction of the fixed scroll 24. Therefore, due to the pressure difference between the fixed oil groove 80 and the second compression chamber 40b, the lubricating oil supplied to the fixed 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 to the first thrust surface 24e from near the first end 80a of the fixed oil groove 80 flows into the second compression chamber 40b communicating with the suction port 24d.

[0079] In conventional scroll compressors, the fixed-side oil groove does not extend circumferentially around the fixed scroll to the vicinity of the suction port, resulting in an insufficient supply of lubricating oil from the fixed-side oil groove to the second compression chamber, and insufficient suppression of refrigerant leakage from the second compression chamber.

[0080] In the first embodiment, the fixed scroll 24 has a fixed oil groove 80 formed in the outer peripheral wall 24c thereof, the fixed oil groove 80 extending 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 the fixed oil groove 80 that can sufficiently supply lubricating oil to the second compression chamber 40b. Therefore, the scroll compressor 101 has the effect of suppressing refrigerant leakage from the second compression chamber 40b.

[0081] Furthermore, in States 1A and 1B, the first compression chamber 40a is located near the fixed-side oil groove 80 in the radial direction of the fixed scroll 24. 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 via the first thrust surface 24e to the first compression chamber 40a that communicates with the suction port 24d. In other words, the lubricating oil supplied from near the first end 80a of the fixed-side oil groove 80 to the first thrust surface 24e flows into the first compression chamber 40a that communicates with the suction port 24d. Therefore, the scroll compressor 101 has the effect of suppressing refrigerant leakage from the first compression chamber 40a.

[0082] Furthermore, the scroll compressor 101 has the effect of improving the efficiency of the refrigeration system 1 by suppressing leakage of 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. The following description will focus on the differences from the first embodiment.

[0084] In the second embodiment, as shown in Fig. 9, a first movable oil groove 81 is formed in the upper surface of the movable scroll 26, on a second thrust surface 26e that slides against the outer peripheral wall 24c of the fixed scroll 24. The first movable oil groove 81 communicates with the fixed oil groove 80 while the movable scroll 26 orbits. The first movable 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 while the movable scroll 26 orbits. The first movable oil groove 81 is formed near the second end 26f of the movable wrap 26b. The first movable oil groove 81 has a linear shape extending in a predetermined direction.

[0085] First movable-side oil groove 81 communicates with fixed-side oil groove 80 and simultaneously communicates with first compression chamber 40a or second compression chamber 40b in a predetermined section of the angular region in which movable scroll 26 orbits. In this predetermined section, lubricating oil supplied to fixed-side oil groove 80 passes through first movable-side oil groove 81 and is supplied to first compression chamber 40a or second compression chamber 40b, which communicates with suction port 24d, at a position closer to suction port 24d than first line segment L1.

[0086] 10A to 10E show changes in the state of the compression mechanism 15 while the movable scroll 26 is orbiting. 10A to 10E show states 2A to 2E, respectively, of the compression mechanism 15. The orbiting movement of the movable scroll 26 causes the states of the compression mechanism 15 to cycle through the following order: state 2A, state 2B, state 2C, state 2D, state 2E, state 2A, state 2B, and so on.

[0087] The angular position of the orbiting 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 shown in Figures 6A to 6D of the first embodiment. Therefore, states 1A to 1D of the first embodiment are applicable to the second embodiment.

[0088] Fig. 11 shows changes in the state of the compression mechanism 15 while the movable scroll 26 makes one revolution relative to the fixed scroll 24. Fig. 11 shows, within the angular range of 0° to 360° in which the movable scroll 26 makes one revolution, angular regions in which the compression mechanism 15 is in states 1A to 1D and angular regions in which the compression mechanism 15 is in states 2A to 2E.

[0089] 10A, in state 2A, the first movable-side oil groove 81 simultaneously communicates with 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 orbits and transitions from state 2A to state 2B, the first movable-side oil groove 81 is no longer in communication with the fixed-side oil groove 80 .

[0091] 10B, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80, but 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, no lubricating oil is supplied to the first compression chamber 40a or the second compression chamber 40b.

[0092] When the movable scroll 26 orbits and transitions from state 2B to state 2C, the first movable-side oil groove 81 is no longer in communication with the first compression chamber 40a and the second compression chamber 40b.

[0093] 10C, the first movable-side oil groove 81 does not communicate with the fixed-side oil groove 80, the first compression chamber 40 a, and the second compression chamber 40 b. In the state 2C, no lubricating oil is supplied to the first compression chamber 40 a and the second compression chamber 40 b.

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

[0095] 10D, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80, but does not communicate with the first compression chamber 40a or the second compression chamber 40b. In the state 2D, 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 or the second compression chamber 40b.

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

[0097] 10E, the first movable-side oil groove 81 is in communication with both the fixed-side oil groove 80 and the second compression chamber 40b. The first movable-side oil groove 81 is not in communication with the first compression chamber 40a. In the 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 transitions from state 2E to state 2A, the second end 26f of the movable side wrap 26b comes into contact with the fixed side wrap 24b, causing the first movable side oil groove 81 to no longer communicate with the second compression chamber 40b but to communicate with the first compression chamber 40a.

[0099] (2) Features In the second embodiment, while the movable scroll 26 orbits once relative to the fixed scroll 24, the first movable 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, first movable oil grooves 81a to 81e indicate the positions of the first movable oil groove 81 in States 2A to 2E, respectively. In State 2A, the fixed oil groove 80 directly communicates with the first compression chamber 40a via the first movable oil groove 81. In State 2E, the fixed oil groove 80 directly communicates with the second compression chamber 40b via the first movable oil groove 81.

[0100] The first compression chamber 40a and the second compression chamber 40b, which communicate with the suction port 24d, are filled with uncompressed refrigerant. Therefore, while the movable scroll 26 is orbiting, the pressure in the fixed oil groove 80, which communicates with the high-pressure space 71, is higher than the pressure in the first compression chamber 40a and the second compression chamber 40b, which communicate with the suction port 24d.

[0101] Therefore, in state 2E, due to the pressure difference between fixed-side oil groove 80 and second compression chamber 40b, the lubricating oil supplied to fixed-side oil groove 80 passes through first movable-side oil groove 81 and is supplied to second compression chamber 40b, which communicates with suction port 24d. Therefore, scroll compressor 101 has the effect of suppressing refrigerant leakage from second compression chamber 40b.

[0102] In state 2A, the pressure difference between fixed oil groove 80 and first compression chamber 40a causes the lubricating oil supplied to fixed oil groove 80 to pass through first movable oil groove 81 and be supplied to first compression chamber 40a, which is in communication with suction port 24d. Therefore, scroll compressor 101 has the effect of suppressing refrigerant leakage from 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. The following description will focus on the differences from the first embodiment.

[0104] In the third embodiment, as shown in Fig. 13, a first movable oil groove 81 is formed in the upper surface of the movable scroll 26, on a second thrust surface 26e that slides against the outer peripheral wall 24c of the fixed scroll 24. The first movable oil groove 81 communicates with the fixed oil groove 80 while the movable scroll 26 orbits. The first movable 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 while the movable scroll 26 orbits. The first movable oil groove 81 is formed near the second end 26f of the movable wrap 26b. The first movable oil groove 81 has a linear shape extending in a predetermined direction.

[0105] The first movable oil groove 81 communicates with the fixed oil groove 80 but does not communicate with the first compression chamber 40 a or the second compression chamber 40 b in a first section S1 of the angular region in which the movable scroll 26 orbits. The first movable oil groove 81 does not communicate with the fixed oil groove 80 but communicates with either the first compression chamber 40 a or the second compression chamber 40 b in a second section S2 of the angular region in which the movable scroll 26 orbits. The second section S2 is an angular region that does not overlap with the first section S1.

[0106] In the first section S1, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80. 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 in the second section S2 that is closer to the suction port 24d than the first line segment L1. 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 in the second section S2 that is closer to the suction port 24d than the first line segment L1.

[0108] 14A to 14G show changes in the state of the compression mechanism 15 while the movable scroll 26 is orbiting. Figures 14A to 14G respectively show states 3A to 3G of the compression mechanism 15. The orbiting movement of the movable scroll 26 causes the states of the compression mechanism 15 to cycle through the following states in this order: state 3A, state 3B, state 3C, state 3D, state 3E, state 3F, state 3G, state 3A, state 3B, ...

[0109] The angular position of the orbiting 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 shown in Figures 6A to 6D of the first embodiment. Therefore, states 1A to 1D of the first embodiment are applicable to the third embodiment.

[0110] Figure 15 shows changes in the state of the compression mechanism 15 while the movable scroll 26 makes one revolution relative to the fixed scroll 24. Figure 15 shows, within the angular range of 0° to 360° over which the movable scroll 26 makes one revolution, angular regions in which the compression mechanism 15 is in states 1A to 1D and angular regions in which the compression mechanism 15 is in states 3A to 3G. Figure 15 shows a first section S1 and a second section S2. The first section S1 corresponds to the section in which the compression mechanism 15 is in state 3C or state 3E. The second section S2 corresponds to the section in which the compression mechanism 15 is in state 3A or state 3G.

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

[0112] When the movable scroll 26 orbits and transitions from State 3A to State 3B, the first movable oil groove 81 is no longer in communication with the first compression chamber 40a.

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

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

[0115] 14C, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80, but does not communicate with the first compression chamber 40a or the second compression chamber 40b. In the state 3C, the lubricating oil supplied to the fixed-side oil groove 80 is supplied to the first movable-side oil groove 81. The lubricating oil is not supplied to the first compression chamber 40a or the second compression chamber 40b.

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

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

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

[0119] 14E, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80 but does not communicate with the first compression chamber 40a or 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 or the second compression chamber 40b.

[0120] When the movable scroll 26 orbits and transitions from state 3E to state 3F, the first movable-side oil groove 81 is no longer in communication with the fixed-side oil groove 80 .

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

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

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

[0124] When the movable scroll 26 rotates and transitions from state 3G to state 3A, the second end 26f of the movable side wrap 26b comes into contact with the fixed side wrap 24b, causing the first movable side oil groove 81 to no longer communicate with the second compression chamber 40b but to communicate with the first compression chamber 40a.

[0125] (2) Features In the third embodiment, while the movable scroll 26 orbits once relative to the fixed scroll 24, the first movable 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, first movable oil grooves 81a to 81g indicate the positions of the first movable oil groove 81 in States 3A to 3G, respectively. In States 3C and 3E, the first movable oil groove 81 communicates with the fixed oil groove 80. In State 3A, the first movable oil groove 81 communicates with the first compression chamber 40a. In State 3G, the first movable oil groove 81 communicates with the second compression chamber 40b.

[0126] The first compression chamber 40a and the second compression chamber 40b, which communicate with the suction port 24d, are filled with uncompressed refrigerant. Therefore, while the movable scroll 26 is orbiting, the pressure in the fixed oil groove 80, which communicates with the high-pressure space 71, is higher than the pressure in the first compression chamber 40a and the second compression chamber 40b, which communicate with the suction port 24d. Furthermore, in states 3C and 3E, the high-pressure lubricating oil supplied to the fixed oil groove 80 is supplied to the first movable oil groove 81. As a result, in states 3C and 3E, the pressure in the first movable oil groove 81 becomes the same as the pressure in the fixed oil groove 80.

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

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

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

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

[0131] The first movable oil groove 81 communicates with the fixed oil groove 80 while the movable scroll 26 is orbiting. The first movable 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 while the movable scroll 26 is orbiting. The first movable oil groove 81 is formed near the second end 26f of the movable wrap 26b. The first movable oil groove 81 has a linear shape extending in a predetermined direction.

[0132] The second movable oil groove 82 communicates with the fixed oil groove 80 while the movable scroll 26 is orbiting. The second movable oil groove 82 communicates with the first compression chamber 40a while the movable scroll 26 is orbiting. As shown in FIG. 17 , the second movable 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 end plate 26a. The radial direction of the movable scroll 26 is the radial direction of the circular main surface of the movable end plate 26a.

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

[0134] In the third section S3, the first movable-side oil groove 81 communicates with the fixed-side oil groove 80 and simultaneously 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, which communicates with the suction port 24d, at a position closer to the suction port 24d than the first line segment L1.

[0135] In the fourth section S4, the second movable-side oil groove 82 communicates with the fixed-side oil groove 80 and also communicates with the first compression chamber 40a. In the fourth section S4, the second movable-side oil groove 82 does not communicate with the second compression chamber 40b. 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, which communicates with the suction port 24d.

[0136] 18A to 18G show changes in the state of the compression mechanism 15 while the movable scroll 26 is orbiting. Figures 18A to 18G respectively show States 4A to 4G of the compression mechanism 15. The orbiting movement of the movable scroll 26 causes the states of the compression mechanism 15 to cycle through the following states in this order: State 4A, State 4B, State 4C, State 4D, State 4E, State 4F, State 4G, State 4A, State 4B, ...

[0137] The angular position of the orbiting 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 shown 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] Figure 19 shows changes in the state of the compression mechanism 15 while the movable scroll 26 makes one revolution relative to the fixed scroll 24. Figure 19 shows the angular regions in which the compression mechanism 15 is in states 1A to 1D and states 4A to 4G within the angular region of 0° to 360° over which the movable scroll 26 makes one revolution. Figure 19 also shows a third section S3 and a fourth section S4. The third section S3 corresponds to the section in which the compression mechanism 15 is in state 4D or state 4E. The fourth section S4 corresponds to the section in which the compression mechanism 15 is in 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 or 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 or 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 or the second compression chamber 40b.

[0140] When the movable scroll 26 orbits and transitions from State 4A to State 4B, the second movable 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 or 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 orbits and transitions from State 4B to State 4C, the second movable oil groove 82 is no longer in communication 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 or 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 or 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 or the second compression chamber 40b.

[0144] When the movable scroll 26 orbits and transitions 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 26f of the movable-side wrap 26b comes into contact with 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 or 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 orbits and transitions from State 4D to State 4E, the second movable-side oil groove 82 is no longer in communication 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, or 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 orbits and transitions from State 4E to State 4F, the first movable-side oil groove 81 is no longer in communication with the fixed-side oil groove 80 .

[0149] 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 or the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the fixed-side oil groove 80 or the first compression chamber 40a or the second compression chamber 40b. In state 4F, no lubricating oil is supplied to the first compression chamber 40a or the second compression chamber 40b.

[0150] When the movable scroll 26 orbits and transitions 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 Figure 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 or 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 or 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. No lubricating oil is supplied to the first compression chamber 40a or the second compression chamber 40b.

[0152] When the movable scroll 26 rotates and transitions from state 4G to state 4A, the second end 26f of the movable side wrap 26b comes into contact with the fixed side wrap 24b, causing the first movable side oil groove 81 to no longer communicate with the second compression chamber 40b and to communicate with the first compression chamber 40a.

[0153] (2) Features In the fourth embodiment, while the movable scroll 26 makes one revolution relative 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, which communicate with the suction port 24d, are filled with uncompressed refrigerant. Therefore, while the movable scroll 26 is orbiting, the pressure in the fixed oil groove 80, which communicates with the high-pressure space 71, is higher than the pressure in the first compression chamber 40a and the second compression chamber 40b, which communicate with the suction port 24d.

[0155] Therefore, in states 4D and 4E, the pressure difference between fixed oil groove 80 and second compression chamber 40b causes the lubricating oil supplied to fixed oil groove 80 to pass through first movable oil groove 81 and be supplied to second compression chamber 40b, which is in communication with suction port 24d. Therefore, scroll compressor 101 has the effect of suppressing refrigerant leakage from second compression chamber 40b.

[0156] In state 4B, the pressure difference between fixed oil groove 80 and first compression chamber 40a causes the lubricating oil supplied to fixed oil groove 80 to pass through second movable oil groove 82 and be supplied to first compression chamber 40a. Therefore, scroll compressor 101 has the effect of suppressing refrigerant leakage from first compression chamber 40a.

[0157] 19 , the third section S3, in which lubricating oil is supplied to the second compression chamber 40b, and the fourth section S4, in which lubricating oil is supplied to the first compression chamber 40a, do not overlap. In other words, while the movable scroll 26 is orbiting, lubricating oil is not simultaneously supplied to the first compression chamber 40a and the second compression chamber 40b. If lubricating oil were simultaneously supplied to the first compression chamber 40a and the second compression chamber 40b, the amount of lubricating oil supplied to the first compression chamber 40a would differ from the amount of lubricating oil supplied to the second compression chamber 40b, which could result in insufficient lubricating oil being supplied to either the first compression chamber 40a or the second compression chamber 40b. Therefore, the scroll compressor 101 effectively suppresses refrigerant leakage from the first compression chamber 40a and the second compression chamber 40b.

[0158] <Modifications> (1) Modification 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 Figures 20A and 20B, the first movable-side oil groove 81 may have an extension portion 91 that extends in the circumferential direction of the movable scroll 26. Figures 20A and 20B are enlarged views similar to Figures 12 and 16.

[0160] 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 of the extension portion 91.

[0161] 20B has one extension portion 91 and two oil supply portions 92. The two oil supply portions 92 are connected to both ends 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 orbiting 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 orbiting motion of the movable scroll 26. Therefore, the first movable-side oil groove 81 having the extension portion 91 has the effect of promoting the supply of oil to the first thrust surface 24e and the second thrust surface 26e.

[0163] Oil supply portion 92 extends radially from first movable oil groove 81 toward compression chamber 40. Therefore, oil supply portion 92 lengthens the period during which first movable oil groove 81 communicates with compression chamber 40 while movable scroll 26 is orbiting. Therefore, first movable oil groove 81 having oil supply portion 92 has the effect of promoting the supply of oil to compression chamber 40.

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

[0165] (2) Modification Example 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 also 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 as defined in the claims.

[0167] 1: Refrigeration device 24: Fixed scroll 24a: Fixed side end plate (first end plate) 24b: Fixed side wrap (first wrap) 24c: Outer circumferential wall 24d: Suction port 24e: First thrust surface (first surface) 24f: Oil passage 26: Orbiting scroll 26a: Movable side end plate (second end plate) 26b: Movable side wrap (second wrap) 26e: Second thrust surface (second surface) 26f: Second end 40a: First compression chamber 40b: Second compression chamber 80: Fixed side oil groove (first oil groove) 80a: First end 81: First movable side oil groove (second oil groove) 82: Second movable side oil groove (third oil groove) 91: Extension portion S1: First section S2 : Second section S3 : Third section S4 : Fourth section 100 : Refrigerant circuit 101 : Scroll compressor L1 : First line segment P1 : First contact point P2 : Second contact point

[0168] JP 2016-160816 A

Claims

1. A scroll compressor (101) comprising: a fixed scroll (24) having a first mirror plate (24a), an outer peripheral wall (24c) erected at an outer edge portion of the first mirror plate, and a spiral first wrap (24b) erected on the first mirror plate inside the outer peripheral wall; a movable scroll (26) having a second mirror plate (26a) and a spiral second wrap (26b) erected on the second mirror plate; wherein a first oil groove (80) extending in the circumferential direction is provided on a first surface (24e) of the outer peripheral wall that slides with the second mirror 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, and a suction port (24d) that opens near an end of winding of the first wrap; during rotation of the movable scroll, a second end portion (26e) on the end of winding 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 portion (80a) of the first oil groove located on the end of winding 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.

2. The scroll compressor according to claim 1, wherein the fixed scroll and the movable scroll form a first compression chamber (40a) formed outside the second wrap and a second compression chamber (40b) formed inside the second wrap; a second oil groove (81) is provided on a second surface (26e) of the second mirror plate that slides with the outer peripheral wall; the second oil groove communicates with the first oil groove during rotation 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.

3. The scroll compressor according to claim 2, wherein 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 when the second wrap contacts the outer peripheral wall during rotation of the movable scroll.

4. The scroll compressor according to claim 2 or 3, 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 an angular region where the movable scroll rotates.

5. The second oil groove communicates with the first oil groove in a first section (S1) of the angular region in which the movable scroll rotates, and does not communicate with the first compression chamber and the second compression chamber; in a second section (S2) of the angular region in which the movable scroll rotates, it communicates with the first compression chamber or the second compression chamber and 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 2 or 3.

6. A third oil groove (82) 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 a third section (S3) of the angular region in which the movable scroll rotates; the third oil groove communicates with the first compression chamber in a fourth section (S4) of the angular region in which the movable scroll rotates; the third section and the fourth section do not overlap with each other. The scroll compressor according to any one of claims 2 to 5.

7. The second oil groove has an extension portion (91) extending in the circumferential direction. The scroll compressor according to any one of claims 1 to 6.

8. A refrigeration device (1) comprising the scroll compressor (101) according to any one of claims 1 to 7, and a refrigerant circuit (100) through which the refrigerant compressed by the scroll compressor flows.

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