Scroll compressor and refrigerator

Abstract

To address a risk of insufficient lubrication at a sliding section between an Oldham joint and a movable scroll.SOLUTION: A scroll compressor 101 comprises a fixed scroll 24, a movable scroll 26 and an Oldham joint 39. The Oldham joint 39 includes an annular body section 39a and a second key section 39c. A fixed-side oil groove 80 is provided on a first thrust surface 24e, which slides with a movable-side mirror plate 26a on a peripheral wall 24c of the fixed scroll 24. The fixed scroll 24 has an oil passage 24f which supplies oil to the fixed-side oil groove 80. A movable-side key groove 26d, in which a second key section 39c slides during orbital motion of the movable scroll 26, is provided on a lower surface 26g of the movable-side mirror plate 26a. The movable-side mirror plate 26a also has an oil hole 26i which connects the movable-side key groove 26d with a second thrust surface 26e on an opposite side to the lower surface 26g. The fixed-side oil groove 80 communicates with the oil hole 26i within a predetermined section of an angle region where the movable scroll 26 performs the orbital motion.SELECTED DRAWING: Figure 9A

Description

[Technical Field]

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

[0002] Conventionally, scroll compressors have been used that include an Oldham coupling for suppressing rotation of a movable scroll during orbiting. As disclosed in Patent Document 1 (JP 2014-070598 A), a scroll compressor is known in which keyways, in which the keys of the Oldham coupling slide, are formed in the fixed scroll and the movable scroll. Summary of the Invention [Problem to be solved by the invention]

[0003] In the scroll compressor of Patent Document 1 (JP 2014-070598 A), a passage is provided in the fixed scroll for supplying lubricating oil to the key grooves of the fixed scroll. However, this scroll compressor does not have a mechanism for supplying lubricating oil to the key grooves of the movable scroll. Furthermore, because the key grooves of the movable scroll open downward, lubricating oil is likely to flow down from the key grooves. This can result in poor lubrication of the sliding portion between the Oldham coupling and the movable scroll. [Means for solving the problem]

[0004] A scroll compressor according to a first aspect includes a fixed scroll, a movable scroll, and an Oldham coupling. 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. The Oldham coupling has an annular main body and a key extending from the main body. The Oldham coupling is configured to suppress rotation of the movable scroll during orbiting. 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. A third surface of the second end plate, opposite the second surface that slides against the outer peripheral wall, is provided with a keyway in which a key slides during orbiting of the movable scroll. The second end plate is provided with an oil hole that connects the keyway and the second surface, and the first oil groove communicates with the oil hole in a predetermined section of the angular range in which the movable scroll orbits.

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

[0006] A scroll compressor according to a second aspect is the scroll compressor according to the first aspect, wherein the third surface is provided with a pair of keyways, each consisting of a first keyway and a second keyway, and the second end plate is provided with a first oil hole that is an oil hole communicating with the first keyway and a second oil hole that is an oil hole communicating with the second keyway.

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

[0008] A scroll compressor according to a third aspect is the scroll compressor according to the second aspect, wherein the fixed scroll further has a suction port that opens near the end of the first wrap. The fixed scroll and the movable scroll define a first compression chamber formed on the outside of the second wrap and a second compression chamber formed on the inside of the second wrap and communicating with the suction port. A second oil groove and a third oil groove are provided on the second surface. The second oil groove communicates with the first oil groove and the first compression chamber while the movable scroll orbits. The third oil groove communicates with the first oil groove and the second compression chamber while the movable scroll orbits.

[0009] The scroll compressor according to the third aspect can suppress leakage of refrigerant from the compression chambers.

[0010] A scroll compressor of a fourth aspect is the scroll compressor of the third aspect, wherein the first oil groove communicates with the first oil hole in a first section of the angular range in which the orbiting scroll orbits. The first oil groove communicates with the second oil hole in a second section of the angular range in which the orbiting scroll orbits. The first oil groove communicates with the first compression chamber via the second oil groove in a third section of the angular range in which the orbiting scroll orbits. The first oil groove communicates with the second compression chamber via the third oil groove in a fourth section of the angular range in which the orbiting scroll orbits. The first section, second section, third section, and fourth section do not overlap with one another.

[0011] The scroll compressor according to the fourth aspect can suppress a decrease in the amount of lubricating oil supplied to the key groove of the orbiting scroll.

[0012] A scroll compressor according to a fifth aspect is the scroll compressor according to any one of the first to fourth aspects, wherein the second surface is further provided with a fourth oil groove communicating with the oil hole. The first oil groove communicates with the oil hole via the fourth oil groove in a predetermined section of the angular region in which the orbiting scroll orbits.

[0013] The scroll compressor according to the fifth aspect can suppress the occurrence of poor lubrication of the sliding portion between the Oldham coupling and the movable scroll.

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

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

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

[0017] The refrigeration device according to the seventh aspect can suppress seizure between the Oldham coupling and the movable scroll, thereby improving reliability. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a refrigerant circuit diagram of a refrigeration device 1 of a first embodiment. [Figure 2] 1 is a vertical cross-sectional view of a scroll compressor 101 according to a first embodiment. [Figure 3] FIG. 2 is a bottom view of the fixed scroll 24 of the first embodiment. [Figure 4] FIG. 2 is a top view of the movable scroll 26 of the first embodiment. [Figure 5] FIG. 2 is a perspective view of an Oldham coupling 39 according to the first embodiment. [Figure 6A] 1 is a diagram illustrating a state 1A of the compression mechanism 15 of the first embodiment. FIG. [Figure 6B] 1B is a diagram illustrating a state 1B of the compression mechanism 15 of the first embodiment. FIG. [Figure 6C] 1C is a diagram illustrating a state 1C of the compression mechanism 15 according to the first embodiment. FIG. [Figure 6D] 1D is a diagram illustrating a state 1D of the compression mechanism 15 of the first embodiment. FIG. [Figure 7] 5 is a diagram for explaining the position of a first end 80a of a fixed-side oil groove 80 in the first embodiment. FIG. [Figure 8] 3A to 3C are diagrams illustrating changes in the state of the compression mechanism 15 of the first embodiment. [Figure 9A] 2A is a diagram illustrating a state 2A of the compression mechanism 15 of the first embodiment. FIG. [Figure 9B] 2B is a diagram illustrating a state 2B of the compression mechanism 15 according to the first embodiment. FIG. [Figure 9C] 2C is a diagram illustrating a state 2C of the compression mechanism 15 according to the first embodiment. FIG. [Figure 9D] FIG. 2 is a diagram illustrating a state 2D of the compression mechanism 15 of the first embodiment. [Figure 10] 3A to 3C are diagrams illustrating changes in the state of the compression mechanism 15 of the first embodiment. [Figure 11] FIG. 4 is a diagram showing the trajectory of a first oil hole 26i1 in the first embodiment. [Figure 12] FIG. 4 is a diagram showing the trajectory of a second oil hole 26i2 in the first embodiment. [Figure 13] FIG. 10 is a top view of a movable scroll 26 according to a second embodiment. [Figure 14A] 3A is a diagram illustrating a state 3A of the compression mechanism 15 of the second embodiment. FIG. [Figure 14B] 3B is a diagram illustrating a state 3B of the compression mechanism 15 according to the second embodiment. FIG. [Figure 14C] 3C is a diagram illustrating a state 3C of the compression mechanism 15 according to the second embodiment. FIG. [Figure 14D] FIG. 10 is a diagram illustrating a state 3D of the compression mechanism 15 according to the second embodiment. [Figure 15] 10A to 10C are diagrams illustrating changes in the state of a compression mechanism 15 of a second embodiment. [Figure 16] FIG. 10 is a diagram showing the path of a first oil groove 26j1 in the second embodiment. [Figure 17] FIG. 10 is a diagram showing the path of a second oil groove 26j2 in the second embodiment. [Figure 18] FIG. 10 is a top view of a movable scroll 26 according to a third embodiment. [Figure 19A] 4A is a diagram illustrating a state 4A of the compression mechanism 15 of the third embodiment. FIG. [Figure 19B] 4B is a diagram illustrating a state 4B of the compression mechanism 15 according to the third embodiment. FIG. [Figure 19C] 4C is a diagram illustrating a state 4C of the compression mechanism 15 according to the third embodiment. FIG. [Figure 19D]FIG. 4D is a diagram illustrating a state 4D of the compression mechanism 15 according to the third embodiment. [Figure 19E] 4E is a diagram illustrating a state 4E of the compression mechanism 15 according to the third embodiment. FIG. [Figure 19F] 4A is a diagram illustrating a state 4F of the compression mechanism 15 according to the third embodiment. FIG. [Figure 19G] FIG. 4 is a diagram illustrating a state 4G of the compression mechanism 15 according to the third embodiment. [Figure 19H] FIG. 4B is a diagram illustrating a state 4H of the compression mechanism 15 according to the third embodiment. [Figure 19I] FIG. 4B is a diagram illustrating a state 4I of the compression mechanism 15 according to the third embodiment. [Figure 20] 10A and 10B are diagrams illustrating changes in the state of a compression mechanism 15 of a third embodiment. [Figure 21A] 10 is a diagram showing the shape of a first oil groove 26j1 of Modification A. FIG. [Figure 21B] 10 is a diagram showing the shape of a first oil groove 26j1 of Modification A. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] First Embodiment (1) Overall structure 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 conditioner. The refrigeration system 1 includes a refrigerant circuit 100 that is 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.

[0020] 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.

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

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

[0023] 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.

[0024] 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 a refrigerating machine oil used to maintain good lubrication of the compression mechanism 15, the 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 members of the sliding parts of the scroll compressor 101, so it is preferable to actively supply lubricating oil to the sliding parts.

[0025] (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.

[0026] As shown in FIG. 3, the fixed scroll 24 has a fixed-side end plate 24a, a fixed-side wrap 24b, and an outer peripheral wall 24c. The fixed-side end plate 24a has a disk shape. The fixed-side 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-side 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 the beginning of the winding, which is located in the center of the fixed-side end plate 24a, to the end of the winding, which connects to the outer peripheral wall 24c. Two fixed-side keyways 24g are formed on the lower surface of the outer peripheral wall 24c.

[0027] As shown in FIG. 4, the movable scroll 26 has a movable side end plate 26a, a movable side wrap 26b, and an upper end bearing 26c. The movable side end plate 26a has a disk shape. The movable side wrap 26b has a spiral shape when viewed vertically. The upper end bearing 26c has a cylindrical shape. The movable side wrap 26b is provided on the upper surface of the movable side end plate 26a. The upper end bearing 26c is provided in the center of the lower surface 26g of the movable side end plate 26a. When viewed vertically, the movable side wrap 26b extends from the beginning of the winding, which is located in the center of the movable side end plate 26a, to the end of the winding, which is located outside the movable side end plate 26a. Two movable side keyways 26d are formed in the lower surface 26g of the movable side end plate 26a.

[0028] The compression mechanism 15 forms a compression chamber 40. The compression chamber 40 is formed between the fixed scroll 24 and the movable scroll 26. The fixed scroll 24 and the movable scroll 26 are arranged 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.

[0029] 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.

[0030] 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 with a cover member 44. A discharge hole 41 is formed in the bottom surface of the enlarged recess 42. The discharge hole 41 is provided 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.

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

[0032] 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.

[0033] An oil passage 24f for supplying oil to the fixed-side oil groove 80 is formed in the fixed scroll 24. The oil passage 24f is formed inside the outer peripheral wall 24c. One end of the oil passage 24f opens 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.

[0034] 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 of the compression chamber 40 in the intermediate-pressure state is higher than the pressure of the refrigerant before compression and lower than the pressure of the compressed refrigerant.

[0035] 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.

[0036] (1-3) Housing 23 The housing 23 is disposed below the compression mechanism 15 and above the motor 16. The outer peripheral surface of the housing 23 is airtightly joined to the inner peripheral surface of the body casing portion 11. The internal space of the casing 10 is divided 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.

[0037] 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.

[0038] The housing 23 mounts the fixed scroll 24 and sandwiches the movable scroll 26 together with the fixed scroll 24. A second refrigerant flow path (not shown) is formed in the outer periphery of the housing 23. The second refrigerant flow path is a hole that penetrates the outer periphery of the housing 23 in the vertical direction. 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.

[0039] 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 through the housing 23 in the vertical direction 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.

[0040] 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.

[0041] 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 the 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.

[0042] (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.

[0043] 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.

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

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

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

[0047] The rotor 52 is a cylindrical member disposed inside the stator core 51a. An air gap is formed between the inner peripheral surface of the stator core 51a and the outer peripheral surface of the rotor 52. The rotor 52 is 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.

[0048] 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 .

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

[0050] (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.

[0051] 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.

[0052] 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 26g of the movable-side end plate 26a. The lower end of the main oil supply passage 61 communicates with the oil reservoir 10a.

[0053] 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 into 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 into the sliding portion between the crankshaft 17 and the upper bearing 32 of the housing 23. The third auxiliary oil supply passage 61c opens into the sliding portion between the crankshaft 17 and the lower bearing 60.

[0054] (1-8) Suction pipe 19 The suction pipe 19 is a pipe for introducing 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.

[0055] (1-9)Discharge pipe 20 The discharge pipe 20 is a pipe for discharging the compressed refrigerant from the high-pressure space 71 to the outside of the casing 10. The discharge pipe 20 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.

[0056] (2) Operation of the scroll compressor 101 When the motor 16 is driven, the crankshaft 17 connected to the rotor 52 of the motor 16 rotates. 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.

[0057] (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 orbiting motion of the movable scroll 26 reduces the volume of the compression chamber 40 to which the refrigerant before compression is supplied. Therefore, the refrigerant is compressed in the compression chamber 40 to become compressed refrigerant. During the process of compressing the refrigerant, the compression chamber 40 becomes an intermediate-pressure compression chamber 40.

[0058] 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.

[0059] (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.

[0060] 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.

[0061] (3) Detailed configuration (3-1) Rotational movement of the movable scroll 26 6A to 6D show changes in the state of the compression mechanism 15 while the movable scroll 26 is orbiting. FIGS. 6A to 6D show states 1A to 1D of the compression mechanism 15, respectively. FIGS. 6A to 6D are bottom views of the compression mechanism 15. Therefore, the shape of the movable scroll 26 shown in FIGS. 6A to 6D is bilaterally symmetrical with the shape of the movable scroll 26 shown in FIG. 4, which is a top view. As the movable scroll 26 orbits, the states of the compression mechanism 15 are cyclically switched in the order of state 1A, state 1B, state 1C, state 1D, state 1A, state 1B, ...

[0062] 6A to 6D, the compression mechanism 15 forms 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.

[0063] 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 on the opposite side of the first end 80a extends to the vicinity of the first communication passage 24h in the circumferential direction of the fixed scroll 24.

[0064] FIG. 7 shows the change in the position of the second end 26f of the movable wrap 26b on the winding end side during orbiting of the movable scroll 26. As shown in FIG. 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.

[0065] FIG. 8 shows the changes in the state of the compression mechanism 15 while the movable scroll 26 makes one revolution 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 makes one revolution. In FIG. 8, the angle at which state 1D switches 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 revolution.

[0066] 6A, in State 1A, the suction port 24d communicates with the first compression chamber 40a but does not communicate 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 6D, in State 1D, 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.

[0073] 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.

[0074] 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°.

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

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

[0077] The longitudinal direction of the first key groove 26d1 and the second key groove 26d2 is the radial direction of the movable scroll 26. The radial direction of the movable scroll 26 is the radial direction of the circular main surface of the movable end plate 26a. While the movable scroll 26 orbits, the pair of second key portions 39c of the Oldham coupling 39 slide within the first key groove 26d1 and the second key groove 26d2 in the radial direction of the movable scroll 26.

[0078] The movable scroll 26 has two oil holes 26i penetrating the movable end plate 26a. The oil holes 26i communicate between the movable key groove 26d and the second thrust surface 26e. The oil holes 26i extend vertically. As shown in FIG. 4, the two oil holes 26i are composed of a first oil hole 26i1 and a second oil hole 26i2. The first oil hole 26i1 opens into the first key groove 26d1. The second oil hole 26i2 opens into the second key groove 26d2.

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

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

[0081] 9A to 9D show changes in the state of the compression mechanism 15 while the movable scroll 26 is orbiting. 9A to 9D show states 2A to 2D, respectively, of the compression mechanism 15. The orbiting movement of the movable scroll 26 causes the state of the compression mechanism 15 to cycle through the following states in this order: state 2A, state 2B, state 2C, state 2D, state 2A, state 2B, and so on.

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

[0083] Fig. 10 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. 10 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 2D.

[0084] 9A, the fixed-side oil groove 80 does not communicate with the first oil hole 26i1 and the second oil hole 26i2. In the state 2A, no lubricating oil is supplied to the inside of the first key groove 26d1 and the second key groove 26d2.

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

[0086] 9B, the fixed-side oil groove 80 does not communicate with the first oil hole 26i1, but communicates with the second oil hole 26i2. In state 2B, the lubricating oil supplied to the fixed-side oil groove 80 passes through the second oil hole 26i2 and is supplied to the inside of the second key groove 26d2. No lubricating oil is supplied to the inside of the first key groove 26d1.

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

[0088] 9C, the fixed-side oil groove 80 does not communicate with the first oil hole 26i1 and the second oil hole 26i2. In the state 2C, no lubricating oil is supplied to the inside of the first key groove 26d1 and the second key groove 26d2.

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

[0090] 9D, the fixed-side oil groove 80 communicates with the first oil hole 26i1 but does not communicate with the second oil hole 26i2. In state 2D, the lubricating oil supplied to the fixed-side oil groove 80 passes through the first oil hole 26i1 and is supplied to the inside of the first key groove 26d1. No lubricating oil is supplied to the inside of the second key groove 26d2.

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

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

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

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

[0095] Because the pair of movable-side key grooves 26d of the movable scroll 26 open downward, the lubricating oil in the movable-side key grooves 26d tends to flow down. If the amount of lubricating oil inside the movable-side key grooves 26d becomes insufficient, poor lubrication of the sliding portion between the Oldham coupling 39 and the movable scroll 26 may occur. In the scroll compressor 101 of the first embodiment, while the movable scroll 26 is orbiting, the lubricating oil in the fixed-side oil groove 80 is supplied to the pair of movable-side key grooves 26d through the pair of oil holes 26i in the movable-side end plate 26a. Therefore, the scroll compressor 101 has the effect of suppressing poor lubrication of the sliding portion between the Oldham coupling 39 and the movable scroll 26.

[0096] Second Embodiment (1) Composition 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.

[0097] In the second embodiment, as shown in Fig. 13, a pair of oil grooves 26j are formed in the second thrust surface 26e of the movable scroll 26. The pair of oil grooves 26j is composed of a first oil groove 26j1 and a second oil groove 26j2. The first oil hole 26i1 opens into the interior of the first oil groove 26j1. The second oil hole 26i2 opens into the interior of the second oil groove 26j2. The first oil groove 26j1 and the second oil groove 26j2 have a linear shape extending in a predetermined direction.

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

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

[0100] 14A to 14D show changes in the state of the compression mechanism 15 while the movable scroll 26 is orbiting. Figures 14A to 14D show states 3A to 3D, respectively, of the compression mechanism 15. The orbiting movement of the movable scroll 26 causes the state of the compression mechanism 15 to cycle through the following states in this order: state 3A, state 3B, state 3C, state 3D, state 3A, state 3B, and so on.

[0101] 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 14D are the same as those shown in Figures 6A to 6D of the first embodiment, and therefore, states 1A to 1D of the first embodiment are applicable to the second embodiment.

[0102] Fig. 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. Fig. 15 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 3A to 3D.

[0103] 14A, fixed-side oil groove 80 does not communicate with first oil groove 26j1 and second oil groove 26j2. In state 3A, no lubricating oil is supplied to the inside of first key groove 26d1 and second key groove 26d2.

[0104] When the movable scroll 26 orbits and transitions from State 3A to State 3B, the fixed-side oil groove 80 communicates with the second oil groove 26j2.

[0105] 14B, fixed-side oil groove 80 does not communicate with first oil groove 26j1, but communicates with second oil groove 26j2. In state 3B, lubricating oil supplied to fixed-side oil groove 80 passes through second oil groove 26j2 and second oil hole 26i2 and is supplied to the inside of second key groove 26d2. No lubricating oil is supplied to the inside of first key groove 26d1.

[0106] When the movable scroll 26 orbits and transitions from State 3B to State 3C, the fixed-side oil groove 80 is no longer in communication with the second oil groove 26j2.

[0107] 14C, fixed-side oil groove 80 does not communicate with first oil groove 26j1 and second oil groove 26j2. In state 3C, no lubricating oil is supplied to the inside of first key groove 26d1 and second key groove 26d2.

[0108] When the movable scroll 26 orbits and transitions from State 3C to State 3D, the fixed-side oil groove 80 communicates with the first oil groove 26j1.

[0109] 14D, fixed-side oil groove 80 communicates with first oil groove 26j1 but does not communicate with second oil groove 26j2. In state 3D, lubricating oil supplied to fixed-side oil groove 80 passes through first oil groove 26j1 and first oil hole 26i1 and is supplied to the inside of first key groove 26d1. No lubricating oil is supplied to the inside of second key groove 26d2.

[0110] When the movable scroll 26 orbits and transitions from State 3D to State 3A, the fixed-side oil groove 80 is no longer in communication with the first oil groove 26j1.

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

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

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

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

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

[0116] 18, in the third embodiment, a first oil groove 26j1, a second oil groove 26j2, a first movable-side oil groove 81, and a second movable-side oil groove 82 are formed in the second thrust surface 26e of the movable scroll 26. The first oil groove 26j1 and the second oil groove 26j2 are formed in the same positions as in the second embodiment and have the same shapes as in the second embodiment. The first oil groove 26j1 communicates with the first oil hole 26i1. The second oil groove 26j2 communicates with the second oil hole 26i2.

[0117] 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.

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

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

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

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

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

[0123] 19A to 19I show changes in the state of the compression mechanism 15 while the movable scroll 26 is orbiting. Figures 19A to 19I respectively show States 4A to 4I of the compression mechanism 15. The orbiting movement of the movable scroll 26 causes the state 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 4H, State 4I, State 4A, State 4B, and so on.

[0124] 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 19A to 19I are the same as those shown in Figures 6A to 6D of the first embodiment, so States 1A to 1D of the first embodiment are applicable to the third embodiment.

[0125] FIG. 20 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. 20 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 each of States 1A to 1D and each of States 4A to 4I. FIG. 20 shows a first section S1, a second section S2, a third section S3, and a fourth section S4. The first section S1 corresponds to the section in which the compression mechanism 15 is in State 4H. The second section S2 corresponds to the section in which the compression mechanism 15 is in State 4D. The third section S3 corresponds to the section in which the compression mechanism 15 is in State 4B. The fourth section S4 corresponds to the section in which the compression mechanism 15 is in State 4F. As shown in FIG. 20, the first section S1, the second section S2, the third section S3, and the fourth section S4 do not overlap with one another.

[0126] In state 4A, as shown in FIG. 19A, the fixed-side oil groove 80 communicates with the second movable-side oil groove 82. The fixed-side oil groove 80 does not communicate with the first oil groove 26j1, the second oil groove 26j2, or the first movable-side oil groove 81. The first movable-side oil groove 81 communicates with the first compression chamber 40a. The first movable-side oil groove 81 does not communicate with the second compression chamber 40b. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a or the second compression chamber 40b. In state 4A, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 is supplied to the second movable-side oil groove 82. No lubricating oil is supplied to the first compression chamber 40a or the second compression chamber 40b.

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

[0128] In state 4B, as shown in FIG. 19B, the fixed-side oil groove 80 communicates with the second movable-side oil groove 82. The fixed-side oil groove 80 does not communicate with the first oil groove 26j1, the second oil groove 26j2, or the first movable-side oil groove 81. The first movable-side oil groove 81 communicates with the first compression chamber 40a. The first movable-side oil groove 81 does not communicate with the second compression chamber 40b. The second movable-side oil groove 82 communicates with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the second compression chamber 40b. In state 4B, lubricating oil supplied from oil passage 24f to the fixed-side oil groove 80 passes through the second movable-side oil groove 82 and is supplied to the first compression chamber 40a. No lubricating oil is supplied to the second compression chamber 40b.

[0129] When the movable scroll 26 orbits and transitions from state 4B to state 4C, the second movable-side oil groove 82 is no longer in communication with the first compression chamber 40a.

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

[0131] When the movable scroll 26 orbits and transitions from State 4C to State 4D, the fixed-side oil groove 80 communicates with the second oil groove 26j2. As a result of the second end 26f of the movable-side wrap 26b coming into contact with the outer peripheral wall 24c, the first movable-side oil groove 81 no longer communicates with the first compression chamber 40a but communicates with the second compression chamber 40b.

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

[0133] When the movable scroll 26 orbits and transitions from State 4D to State 4E, the fixed-side oil groove 80 no longer communicates with the second movable-side oil groove 82 and the second oil feed groove 26j2.

[0134] In state 4E, as shown in FIG. 19E, the fixed-side oil groove 80 does not communicate with the first oil groove 26j1, the second oil groove 26j2, the first movable-side oil groove 81, and the second movable-side oil groove 82. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a or the second compression chamber 40b. No lubricating oil is supplied to the first compression chamber 40a or the second compression chamber 40b.

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

[0136] In state 4F, as shown in FIG. 19F, the fixed-side oil groove 80 communicates with the first movable-side oil groove 81. The fixed-side oil groove 80 does not communicate with the first oil groove 26j1, the second oil groove 26j2, or the second movable-side oil groove 82. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a or the second compression chamber 40b. In state 4F, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 passes through the first movable-side oil groove 81 and is supplied to the second compression chamber 40b. No lubricating oil is supplied to the first compression chamber 40a.

[0137] When the movable scroll 26 orbits and transitions from State 4F to State 4G, the fixed-side oil groove 80 is no longer in communication with the first movable-side oil groove 81.

[0138] In state 4G, as shown in FIG. 19G, the fixed-side oil groove 80 does not communicate with the first oil groove 26j1, the second oil groove 26j2, the first movable-side oil groove 81, and the second movable-side oil groove 82. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a or the second compression chamber 40b. No lubricating oil is supplied to the first compression chamber 40a or the second compression chamber 40b.

[0139] When the movable scroll 26 orbits and transitions from State 4G to State 4H, the fixed-side oil groove 80 communicates with the first oil groove 26j1.

[0140] In state 4H, as shown in FIG. 19H, the fixed-side oil groove 80 communicates with the first oil groove 26j1. The fixed-side oil groove 80 does not communicate with the second oil groove 26j2, the first movable-side oil groove 81, or the second movable-side oil groove 82. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a or the second compression chamber 40b. In state 4H, the lubricating oil supplied from the oil passage 24f to the fixed-side oil groove 80 passes through the first oil groove 26j1 and the first oil hole 26i1 and is supplied to the first key groove 26d1. No lubricating oil is supplied to the first compression chamber 40a or the second compression chamber 40b.

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

[0142] In state 4I, as shown in FIG. 19I, the fixed-side oil groove 80 communicates with the second movable-side oil groove 82. The fixed-side oil groove 80 does not communicate with the first oil groove 26j1, the second oil groove 26j2, or the first movable-side oil groove 81. The first movable-side oil groove 81 communicates with the second compression chamber 40b. The first movable-side oil groove 81 does not communicate with the first compression chamber 40a. The second movable-side oil groove 82 does not communicate with the first compression chamber 40a or the second compression chamber 40b. No lubricating oil is supplied to the first compression chamber 40a or the second compression chamber 40b.

[0143] When the movable scroll 26 rotates and transitions from state 4I 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 lose communication with the second compression chamber 40b and become connected to the first compression chamber 40a.

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

[0145] The first compression chamber 40a and the second compression chamber 40b, 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-side 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.

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

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

[0148] In the third embodiment, in the first section S1, lubricating oil is supplied to the first key groove 26d1. In the second section S2, lubricating oil is supplied to the second key groove 26d2. In the third section S3, lubricating oil is supplied to the first compression chamber 40a. In the fourth section S4, lubricating oil is supplied to the second compression chamber 40b. As shown in FIG. 20 , the first section S1, the second section S2, the third section S3, and the fourth section S4 do not overlap with one another. In other words, while the movable scroll 26 is orbiting, lubricating oil is not simultaneously supplied to at least two of the first key groove 26d1, the second key groove 26d2, the first compression chamber 40a, and the second compression chamber 40b. If lubricating oil is supplied to at least two of these at the same time, the amount and pressure of lubricating oil supplied from oil passage 24f to fixed-side oil groove 80 will decrease, and there is a risk that lubricating oil will not be sufficiently supplied to first key groove 26d1 and second key groove 26d2. Therefore, the scroll compressor 101 has the effect of being able to suppress poor lubrication of the sliding portion between Oldham coupling 39 and movable scroll 26.

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

[0150] 21A and 21B, first oil groove 26j1 may have an extension 91 that extends in the circumferential direction of orbiting scroll 26. FIGS. 21A and 21B are enlarged views similar to FIG.

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

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

[0153] 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 oil feed groove 26j1 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.

[0154] Oil supply portion 92 extends radially from first oil groove 26j1 toward compression chamber 40. Therefore, by providing oil supply portion 92, the time during which fixed-side oil groove 80 communicates with first oil groove 26j1 is lengthened while orbiting movable scroll 26. Therefore, first oil groove 26j1 having oil supply portion 92 has the effect of promoting the supply of oil to first key groove 26d1.

[0155] Furthermore, by changing the positions and dimensions of extension portion 91 and oil feed portion 92, it is possible to adjust the time during which fixed-side oil groove 80 communicates with first oil feed groove 26j1 and the amount of lubricating oil that can be held in first oil feed groove 26j1 while orbiting movable scroll 26. Therefore, first oil feed groove 26j1 having extension portion 91 and oil feed portion 92 has the effect of making it possible to adjust the timing and amount of oil supply from fixed-side oil groove 80 to first key groove 26d1.

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

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

[0158] 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. [Explanation of symbols]

[0159] 1: Refrigeration equipment 24: Fixed scrolling 24a: Fixed side head plate (first head 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) 26d: Movable side keyway (keyway) 26d1: First keyway 26d2: Second keyway 26e: Second thrust surface (second surface) 26g: Lower surface of the movable side head (third surface) 26i: Oil hole 26i1: 1st oil hole 26i2: 2nd oil hole 26j: Oil groove (4th oil groove) 39: Oldham coupling 39a: Annular main body (main body) 39c: Second key part (key) 40a: First compression chamber 40b: Second compression chamber 80: Fixed side oil groove (1st oil groove) 81: 1st movable side oil groove (3rd oil groove) 82: 2nd movable side oil groove (2nd oil groove) 91 :Extension part 100: Refrigerant circuit 101:Scroll compressor S1: First section S2: Second section S3: Third section S4: Fourth section [Prior art documents] [Patent documents]

[0160] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-070598

Claims

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

2. The third surface is provided with a pair of key grooves consisting of a first key groove (26d1) and a second key groove (26d2), The second end plate is provided with a first oil hole (26i1) which is the oil hole communicating with the first key groove, and a second oil hole (26i2) which is the oil hole communicating with the second key groove. The scroll compressor according to claim 1 .

3. The fixed scroll is further provided with an intake port (24d) that opens near the end of the first wrap, 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 and communicating with the suction port, The second surface is provided with a second oil groove (82) and a third oil groove (81), the second oil groove communicates with the first oil groove and the first compression chamber while the movable scroll is orbiting; the third oil groove communicates with the first oil groove and the second compression chamber while the movable scroll is orbiting; The scroll compressor according to claim 2.

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

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

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

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

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