Scroll compressor and refrigeration device

Abstract

The utility model discloses a scroll compressor and a refrigeration device. A scroll compressor (10) includes a compression mechanism (30) having a stationary scroll (31) and a movable scroll (35), a drive shaft (40), and a floating member (50). The orbiting scroll includes a scroll-side contact surface (39) in contact with the floating member, and a boss portion (38) provided on an inner peripheral side (Ri) of the scroll-side contact surface and connected to an eccentric shaft portion (42) of the drive shaft. The floating member includes a floating-side contact surface (54) that is in contact with the orbiting scroll, and a recess (53) that is provided on the inner peripheral side of the floating-side contact surface and that forms a crank chamber (55) that accommodates the boss portion. An outer space (A) is formed on the outer peripheral side (Ro) of the floating-side contact surface. The floating member is provided with a communication path (59) that connects the crank chamber and the outside space. According to the scroll compressor, the oil film between the movable scroll plate and the floating part is prevented from being broken.

Description

Technical Field

[0001] The utility model relates to a scroll compressor and a refrigeration device. Background Art

[0002] The scroll compressor described in Patent Document 1 includes a compression mechanism having a fixed scroll and an orbiting scroll, a drive shaft, and a floating member. The floating member is pushed upward by supplying high pressure or medium pressure to the back side of the floating member. The floating member presses the orbiting scroll against the fixed scroll.

[0003] Patent Document 1: Japanese Patent Publication No. 2020-193576 Utility Model Content

[0004] -Technical problems to be solved by utility models-

[0005] The floating member functions as a thrust bearing for supporting the movable scroll. The floating member tilts following the tilting of the movable scroll. The floating member can appropriately support the movable scroll while being in contact with the movable scroll with almost no gap.

[0006] The drive shaft has a main shaft portion and an eccentric shaft portion eccentric to the main shaft portion. The boss portion of the movable scroll is connected to the eccentric shaft portion of the drive shaft. A crank chamber is formed by a recessed portion on the floating member. The boss portion of the movable scroll is accommodated in the crank chamber of the floating member. Lubricating oil is supplied from the crank chamber to the sliding portion between the movable scroll and the floating member to form an oil film.

[0007] Since the working fluid exists in the crank chamber, a part of the working fluid may be mixed into the lubricating oil supplied from the crank chamber to the sliding portion between the movable scroll and the floating member.

[0008] If the working fluid is mixed in the lubricating oil, the oil film is easily broken at the sliding part between the orbiting scroll and the floating member. The oil film rupture may lead to poor lubrication and seizure at the sliding part between the orbiting scroll and the floating member.

[0009] The utility model aims to suppress the rupture of the oil film between the movable scroll and the floating component in a scroll compressor.

[0010] -Technical solutions for solving technical problems-

[0011] The first aspect of the present invention is directed to a scroll compressor 10. The scroll compressor 10 includes a compression mechanism 30, a drive shaft 40, and a floating component 50. The compression mechanism 30 includes a fixed scroll 31 and a movable scroll 35. The drive shaft 40 includes a main shaft portion 41 and an eccentric shaft portion 42 eccentric to the main shaft portion 41. The floating component 50 pushes the movable scroll 35 against the fixed scroll 31. The movable scroll 35 includes a scroll side contact surface 39 and a convex column portion 38. The scroll side contact surface 39 contacts the floating component 50. The convex column portion 38 is provided on the scroll side contact surface. The inner circumference Ri of 39 extends toward the floating component 50 and is connected to the eccentric shaft portion 42. The floating component 50 includes a floating side contact surface 54 and a recessed portion 53. The floating side contact surface 54 contacts the movable scroll 35. The recessed portion 53 is provided on the inner circumference Ri of the floating side contact surface 54 and forms a crank chamber 55 for accommodating the convex column portion 38. An outer space A is formed on the outer circumference Ro of the floating side contact surface 54. A connecting passage 59 for connecting the crank chamber 55 with the outer space A is provided on the floating component 50.

[0012] According to the scroll compressor 10 involved in the first aspect, the working fluid existing in the crank chamber 55 is released to the outer space A through the communication path 59. The working fluid is less likely to be mixed with the oil supplied from the crank chamber 55 to the sliding portion between the scroll side contact surface 39 and the floating side contact surface 54. In the sliding portion between the scroll side contact surface 39 and the floating side contact surface 54, the oil film can be suppressed from being broken.

[0013] The second aspect of the present invention is directed to the scroll compressor 10 according to the first aspect. In the scroll compressor 10, the communication passage 59 is formed by a groove portion 59a provided on the floating-side contact surface 54.

[0014] According to the scroll compressor 10 according to the second aspect, by providing the groove portion 59 a on the floating-side contact surface 54 , the communication path 59 can be easily configured.

[0015] The third aspect of the present invention is directed to the scroll compressor 10 according to the first aspect. In the scroll compressor 10, the floating member 50 is provided with a partition wall 58 that separates the crank chamber 55 from the outer space A, and the communication passage 59 is formed by a through hole 59b formed in the partition wall 58.

[0016] According to the scroll compressor 10 according to the third aspect, by forming the through hole 59 b in the partition wall 58 that partitions the crank chamber 55 from the outer space A, the communication path 59 can be easily configured.

[0017] The fourth aspect of the present invention is directed to the scroll compressor 10 according to any one of the first to third aspects. In the scroll compressor 10, the communication passage 59 is arranged on the opposite side of the suction port (34a) in the radial direction R of the drive shaft 40 with respect to the suction port 34a leading to the compression mechanism 30, across the drive shaft 40.

[0018] According to the scroll compressor (10) of the fourth aspect, the communication passage (59) can be spaced away from the suction port (34a), and thus it is possible to suppress the mixing of oil into the working fluid sucked into the compression mechanism (30) through the suction port (34a).

[0019] The fifth aspect of the present invention is directed to the scroll compressor 10 according to any one of the first to fourth aspects. The scroll compressor 10 includes a housing 20, the housing 20 accommodating the compression mechanism 30, the drive shaft 40, and the floating member 50, the drive shaft 40 extending in the vertical direction Z, an oil reservoir 24 for storing oil L is provided at the lower bottom 20a of the housing 20, and an oil passage 43 extending in the vertical direction Z at the inner 40a of the drive shaft 40 is provided on the drive shaft 40, and the oil passage 43 connects the crank chamber 55 with the oil reservoir 24.

[0020] According to the scroll compressor ( 10 ) of the fifth aspect, the oil L can be introduced from the oil reservoir ( 24 ) of the lower bottom portion ( 20 a ) of the casing ( 20 ) into the crank chamber ( 55 ) via the oil passage ( 43 ) of the drive shaft ( 40 ).

[0021] The sixth aspect of the present invention is directed to a refrigeration device 1. The refrigeration device 1 includes the scroll compressor 10 according to any one of the first to fifth aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A refrigeration device 1 according to a first embodiment is shown;

[0023] Figure 2 A scroll compressor 10 according to a first embodiment is shown in a front cross-sectional view;

[0024] Figure 3 The crank chamber 55 and the periphery of the outer space A in the first embodiment are shown in a front cross-sectional view;

[0025] Figure 4 The floating side contact surface 54 of the floating member 50 according to the first embodiment is shown in a top view;

[0026] Figure 5 The cross-sectional shape of the groove portion 59a as the communication path 59 according to the first embodiment is shown;

[0027] Figure 6The crank chamber 55 and the periphery of the outer space A in the second embodiment are shown in a front cross-sectional view;

[0028] Figure 7 The cross-sectional shape of the through hole 59 b serving as the communication path 59 according to the second embodiment is shown.

[0029] - Explanation of symbols -

[0030] Z-axial direction (up and down direction); R-radial direction; Ro-outer circumference; Ri-inner circumference; T-circumferential direction; C-compression chamber; A-outer space; L-lubricating oil (oil); G-working fluid; 1-refrigeration device; 10-scroll compressor; 20-housing; 20a-lower bottom; 24-oil storage portion; 30-compression mechanism; 31-fixed scroll; 34a-intake port; 35-orbiting scroll; 38-column portion; 39-scroll side contact surface; 40-drive shaft; 40a-interior; 41-main shaft portion; 42-eccentric shaft portion; 43-oil passage; 50-floating component; 53-recess; 54-floating side contact surface; 55-crank chamber; 58-partition wall; 59-communication passage; 59a-groove portion; 59b-through hole; 60-frame; 70-motor; 80-lower bearing component; 90-oil pump. DETAILED DESCRIPTION

[0031] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. It should be noted that the present invention is not limited to the embodiments shown below, and various changes can be made without departing from the technical concept of the present invention. The accompanying drawings are used to conceptually illustrate the present invention, so in order to facilitate understanding, the size, ratio or number may be exaggerated or simplified as needed.

[0032] <First embodiment>

[0033] (Refrigeration equipment)

[0034] A scroll compressor 10 according to a first embodiment will be described. The scroll compressor 10 is applied to a refrigeration device 1 . Figure 1 A refrigeration device 1 is shown. The refrigeration device 1 includes a refrigerant circuit 1a in which a refrigerant as a working fluid circulates. The refrigerant circuit 1a of the refrigeration device 1 includes a scroll compressor 10, a condenser (radiator) 2, a pressure reducing mechanism (expansion mechanism) 3, and an evaporator 4. The pressure reducing mechanism 3 is, for example, an expansion valve or a capillary tube. The refrigerant circuit 1a performs a vapor compression refrigeration cycle. The refrigeration device 1 is applied to, for example, an air conditioner or a chiller.

[0035] (compressor)

[0036] Figure 2The scroll compressor 10 is shown in a front cross-sectional view. The compressor 10 includes a housing 20, a compression mechanism 30, a drive shaft 40, a floating member 50, a frame 60, a motor 70, a lower bearing member 80, and an oil pump 90.

[0037] Hereinafter, the extending direction of the axis of the drive shaft 40 is referred to as the axial direction and is indicated by Z. The axial direction of the drive shaft 40 extends in the up-down direction. The up-down direction is also indicated by Z, similar to the axial direction. The upper side of the axial direction (up-down direction) is indicated by Za. The lower side of the axial direction (up-down direction) is indicated by Zb.

[0038] The direction perpendicular to the axis of the drive shaft 40 is referred to as the radial direction, which is represented by R. The side farther from the axis of the drive shaft 40 in the radial direction is referred to as the outer peripheral side, which is represented by Ro. The side closer to the axis of the drive shaft 40 in the radial direction is referred to as the inner peripheral side, which is represented by Ri. The rotation direction of the drive shaft 40 is referred to as the circumferential direction, which is represented by T.

[0039] The scroll compressor 10 is a vertical compressor. The compression mechanism 30, the floating member 50, the frame 60, the motor 70, the lower bearing member 80 and the oil pump 90 are housed in the casing 20 in order from the upper side to the lower side. The drive shaft 40 extends in the casing 20 in the axial direction (vertical direction).

[0040] (case)

[0041] The casing (20) accommodates the compression mechanism (30), the drive shaft (40), the floating member (50), the frame (60), the motor (70), the lower bearing member (80), and the oil pump (90).

[0042] The shell 20 is a cylindrical closed container extending vertically in the axial direction (up and down direction). A partition member 21 is provided in the upper part of the shell 20. The partition member 21 extends in the radial direction and the circumferential direction. The partition member 21 separates the internal space of the shell 20 in the axial direction (up and down direction). A low-pressure space Sa is formed on the lower side of the partition member 21. A high-pressure space Sb is formed on the upper side of the partition member 21.

[0043] The housing 20 is connected to a suction pipe 22. The housing 20 is connected to a discharge pipe 23. The suction pipe 22 passes through the outer peripheral wall of the housing 20. The suction pipe 22 communicates with the low-pressure space Sa. The discharge pipe 23 passes through the upper wall of the housing 20. The discharge pipe 23 communicates with the high-pressure space Sb.

[0044] An oil reservoir 24 is provided at the lower bottom portion 20 a of the casing 20 . The oil reservoir 24 stores lubricating oil L. The lubricating oil L lubricates each sliding portion of the scroll compressor 10 .

[0045] (Compression mechanism)

[0046] The compression mechanism 30 is provided in the housing 20 . The compression mechanism 30 compresses a working fluid (such as a refrigerant). The working fluid is a gas. The compression mechanism 30 includes a fixed scroll 31 and an orbiting scroll 35 . The orbiting scroll 35 meshes with the fixed scroll 31 .

[0047] The fixed scroll disk 31 includes a fixed side end plate portion 32, a fixed side scroll 33 and an outer peripheral wall portion 34. The fixed side end plate portion 32 is in the shape of a circular plate. The fixed side scroll 33 is in the shape of a scroll wall that describes an involute curve and protrudes downward from the lower surface of the fixed side end plate portion 32. The outer peripheral wall portion 34 is formed to surround the fixed side scroll 33 from the outer peripheral side and protrude downward from the lower surface of the fixed side end plate portion 32. The top end surface (lower end surface) of the outer peripheral wall portion 34 is roughly flush with the top end surface (lower end surface) of the fixed side scroll 33.

[0048] The movable scroll 35 is also called a movable disk. The movable scroll 35 is arranged on the lower side of the fixed scroll 31. The movable scroll 35 includes a movable side end plate portion 36, a movable side volute 37, a convex column portion 38, and a volute side contact surface 39. The movable side end plate portion 36 is in the shape of a circular plate. The movable side volute 37 is in the shape of a vortex wall that describes an involute curve and protrudes upward from the upper surface of the movable side end plate portion 36.

[0049] The boss portion 38 is provided at the center of the lower surface (back surface) of the movable side end plate portion 36. The scroll side contact surface 39 is provided on the radially outer peripheral side of the boss portion 38 on the lower surface (back surface) of the movable side end plate portion 36. In other words, the boss portion 38 is provided on the radially inner peripheral side of the scroll side contact surface 39 on the lower surface (back surface) of the movable side end plate portion 36.

[0050] The boss portion 38 is cylindrical. The boss portion 38 extends downward from the central portion of the lower surface (back surface) of the driven side end plate portion 36 toward the floating member 50. A bearing 38a is embedded in the inner periphery of the boss portion 38. The boss portion 38 is connected to the eccentric shaft portion 42 of the drive shaft 40 described later. The scroll side contact surface 39 is annularly surrounding the boss portion 38 when viewed in the axial direction. The scroll side contact surface 39 contacts the floating side contact surface 54 of the floating member 50 described later.

[0051] In the compression mechanism 30, the orbiting lap 37 of the orbiting scroll 35 meshes with the stationary lap 33 of the fixed scroll 31. A compression chamber C is formed in a region surrounded by the stationary end plate 32 and stationary lap 33 of the fixed scroll 31 and the orbiting end plate 36 and orbiting lap 37 of the orbiting scroll 35. The working fluid is compressed in the compression chamber C.

[0052] A suction port 34a is provided at the upper end of a part of the circumferential region of the outer peripheral wall portion 34 of the fixed scroll 31. The suction port 34a extends in the radial direction. The suction port 34a is also called a suction passage. The suction port 34a is connected to the compression chamber C of the compression mechanism 30. The suction port 34a is connected to the low-pressure space Sa.

[0053] A discharge port 32a is axially penetrated in the center of the fixed end plate 32 of the fixed scroll 31. The discharge port 32a is also called a discharge passage. The discharge port 32a communicates with the compression chamber C of the compression mechanism 30. The discharge port 32a communicates with the high-pressure space Sb.

[0054] After the low-pressure working fluid flows into the low-pressure space Sa in the shell 20 through the suction pipe 22, it reaches the compression chamber C of the compression mechanism 30 through the suction port 34a. The working fluid is compressed and becomes high pressure in the compression chamber C of the compression mechanism 30. After the high-pressure working fluid flows out to the high-pressure space Sb through the discharge port 32a, it is discharged to the outside of the shell 20 (for example, the condenser 2 of the refrigerant circuit 1a, etc.) through the discharge pipe 23.

[0055] (Drive shaft)

[0056] The drive shaft 40 extends in the axial direction (up and down direction) in the housing 20. The drive shaft 40 has a main shaft portion 41 and an eccentric shaft portion 42. The eccentric shaft portion 42 is provided at the axial upper end of the main shaft portion 41. The outer diameter of the eccentric shaft portion 42 is smaller than the outer diameter of the main shaft portion 41. The axis 42a of the eccentric shaft portion 42 is eccentric with respect to the axis 41a of the main shaft portion 41 by an eccentric distance r.

[0057] The eccentric shaft portion 42 of the drive shaft 40 is inserted into the boss portion 38 of the movable scroll 35 from the axial lower side. The eccentric shaft portion 42 of the drive shaft 40 is connected to the boss portion 38 of the movable scroll 35. The eccentric shaft portion 42 of the drive shaft 40 is supported by the boss portion 38 of the movable scroll 35 through the bearing 38a and is rotatable (slidable). The movable scroll 35 is concentric with the eccentric shaft portion 42 of the drive shaft 40.

[0058] The drive shaft 40 is provided with an oil passage 43. The oil passage 43 extends in the axial direction (vertical direction) in the interior 40a of the drive shaft 40. The oil passage 43 is used to supply lubricating oil L to each sliding part of the scroll compressor 10.

[0059] (Floating Part)

[0060] The floating member 50 is also called a floating cover. The floating member 50 is cylindrical and extends in the axial direction (vertical direction). The floating member 50 is provided in the casing 20 below the orbiting scroll 35 and above the frame 60 .

[0061] The floating member 50 is supported so as to be able to freely swing relative to the housing 20. The floating member 50 is not directly fixed to the housing 20. The floating member 50 supports the movable scroll 35 in the axial direction. The floating member 50 functions as a thrust bearing. The floating member 50 pushes the movable scroll 35 against the fixed scroll 31 in the axial direction. The drive shaft 40 is inserted into the inner circumference of the floating member 50.

[0062] The floating member 50 includes a scroll support portion 51 , a main shaft support portion 52 , a recessed portion 53 , and a floating-side contact surface 54 .

[0063] The scroll support portion 51 is cylindrical and constitutes the upper portion of the floating member 50. The main shaft support portion 52 is cylindrical and constitutes the lower portion of the floating member 50. The outer diameter of the scroll support portion 51 is larger than the outer diameter of the main shaft support portion 52. The inner diameter of the scroll support portion 51 is larger than the inner diameter of the main shaft support portion 52. The scroll support portion 51 and the main shaft support portion 52 are connected to each other in the axial direction (up and down direction).

[0064] The scroll support portion 51 of the floating member 50 is located directly below the movable scroll 35. The recessed portion 53 is provided at the center of the upper surface (front surface) of the scroll support portion 51 of the floating member 50. The floating side contact surface 54 is provided on the radially outer peripheral side of the recessed portion 53 on the upper surface (front surface) of the floating member 50. In other words, the recessed portion 53 is provided on the radially inner peripheral side of the floating side contact surface 54 on the upper surface (front surface) of the floating member 50.

[0065] The recessed portion 53 is recessed downward from the upper surface (front surface) of the floating member 50 to form a crank chamber 55. The recessed portion 53 (crank chamber 55) is approximately circular when viewed in the axial direction. The crank chamber 55 accommodates the boss portion 38 of the movable scroll 35. The floating side contact surface 54 is annularly surrounding the recessed portion 53 (crank chamber 55) when viewed in the axial direction. The floating side contact surface 54 contacts the scroll side contact surface 39 of the movable scroll 35.

[0066] When the scroll side contact surface 39 of the movable scroll 35 and the floating side contact surface 54 of the floating member 50 are in contact with each other, the crank chamber 55 is sealed relative to the surroundings. An outer space A is formed between the radially outer peripheral side of the outer peripheral end of the floating side contact surface 54 of the floating member 50 and the inner peripheral wall of the casing 20. The outer space A is a part of the low-pressure space Sa.

[0067] When the scroll side contact surface 39 of the orbiting scroll 35 and the floating side contact surface 54 of the floating member 50 contact each other, the crank chamber 55 and the outer space A are partitioned from each other. The crank chamber 55 and the outer space A are partitioned from each other by the scroll side contact surface 39 and the floating side contact surface 54 .

[0068] Furthermore, a partition wall 58 formed of a wall portion of the scroll support portion 51 is provided on the floating member 50. The partition wall 58 extends in the axial direction (vertical direction). The partition wall 58 partitions the crank chamber 55 from the outer space A.

[0069] The floating side contact surface 54 constitutes the upper surface of the partition wall 58. The crank chamber 55 is arranged on the radially inner peripheral side of the partition wall 58 (floating side contact surface 54). The outer space A is arranged on the radially outer peripheral side of the partition wall 58 (floating side contact surface 54).

[0070] The floating member 50 is provided with a communication passage 59 that allows the crank chamber 55 to communicate with the outer space A, which will be described in detail later.

[0071] A first annular groove 56 for accommodating a sealing member (for example, an O-ring or the like, not shown in the figure) is formed at a lower end portion of the outer peripheral surface of the scroll support portion 51 .

[0072] A through hole is provided on the inner peripheral side of the main shaft support portion 52, which penetrates in the axial direction (up and down direction). A bearing 52a is inserted into the through hole of the main shaft support portion 52. The main shaft portion 41 of the drive shaft 40 is supported by the main shaft support portion 52 of the floating member 50 via the bearing 52a so as to be rotatable (slidable). The floating member 50 is concentric with the main shaft portion 41 of the drive shaft 40.

[0073] A second annular groove 57 for accommodating a sealing member (for example, an O-ring, etc., not shown in the figure) is formed at a portion near the upper end of the outer peripheral surface of the main shaft support portion 52 .

[0074] (frame)

[0075] The frame 60 is cylindrical and extends in the axial direction (up and down direction). The frame 60 is provided in the housing 20 below the floating member 50 and above the motor 70. The frame 60 is fixed to the inner peripheral surface of the housing 20 in the low-pressure space Sa. The frame 60 is fixed to the housing 20 with a fixing member or by press-fitting.

[0076] The frame 60 has a fixing portion 61 and a protruding portion 62. The fixing portion 61 is cylindrical and constitutes the outer peripheral portion of the frame 60. The protruding portion 62 is cylindrical and constitutes the inner peripheral portion and the lower portion of the frame 60.

[0077] The outer circumference of the fixing portion 61 is fixed to the inner circumference of the housing 20 by means of a fixing member (not shown). The inner circumference of the fixing portion 61 faces the lower end portion of the outer circumference of the scroll support portion 51 of the floating member 50 in the radial direction (including the first annular groove 56).

[0078] The protrusion 62 protrudes inward from the inner circumference of the fixing portion 61. A through hole penetrating in the axial direction (up and down direction) is provided on the inner circumference of the protrusion 62. The main shaft support portion 52 of the floating member 50 in a state of supporting the main shaft portion 41 of the drive shaft 40 is inserted into the through hole of the protrusion 62.

[0079] The inner peripheral surface of the protruding portion 62 faces the upper end portion (the portion including the second annular groove 57 ) of the outer peripheral surface of the main shaft support portion 52 of the floating member 50 in the radial direction.

[0080] The upper surface of the protrusion 62 faces the lower surface of the scroll support portion 51 of the floating member 50. A third annular groove 63 for accommodating a sealing member (such as an O-ring, etc., not shown) is formed on the inner circumference of the upper surface of the protrusion 62.

[0081] (Electric Motor)

[0082] The motor 70 is provided in the casing 20 below the frame 60 and above the lower bearing member 80. The motor 70 drives the compression mechanism 30 by rotating the drive shaft 40. The motor 70 includes a rotor core 71 as a rotor and a stator core 72 as a stator.

[0083] The rotor core 71 is cylindrical and extends in the axial direction (up and down direction). The main shaft portion 41 of the drive shaft 40 is inserted and fixed on the inner circumference side of the rotor core 71. The stator core 72 is cylindrical and extends in the axial direction (up and down direction). The stator core 72 is fixed to the inner circumference of the housing 20. The stator core 72 is arranged to surround the rotor core 71 from the outer circumference. A predetermined interval is left between the stator core 72 and the rotor core 71 in the radial direction. The rotor core 71 is rotatably inserted on the inner circumference side of the stator core 72.

[0084] (Lower bearing component)

[0085] The lower bearing member 80 is approximately cylindrical and extends in the axial direction (up and down direction). The lower bearing member 80 is provided between the motor 70 and the oil storage portion 24 (the lower bottom portion 20a of the housing 20) in the housing 20. The lower bearing member 80 is fixed to the inner peripheral surface of the housing 20. The lower bearing member 80 has a cylindrical portion 81 and a protruding portion 82. The cylindrical portion 81 is cylindrical. The protruding portion 82 protrudes from the outer peripheral surface of the cylindrical portion 81 toward the outer peripheral side.

[0086] A bearing 81 a is fitted into the inner periphery of the cylindrical portion 81 . The main shaft portion 41 of the drive shaft 40 is rotatably (slidably) supported by the lower bearing member 80 via the bearing 81 a. The protrusion 82 is fixed to the inner peripheral surface of the housing 20 .

[0087] (Oil Pump)

[0088] The oil pump 90 is provided at the lower end of the main shaft portion 41 of the drive shaft 40. The nozzle 91 of the oil pump 90 is immersed in the lubricating oil L stored in the oil reservoir 24 of the lower bottom portion 20a of the casing 20. The oil pump 90 sucks the lubricating oil L from the oil reservoir 24. The lubricating oil L is supplied to each sliding part of the scroll compressor 10 through the oil passage 43 of the drive shaft 40.

[0089] The sliding parts of the scroll compressor 10 include the sliding part between the bearing 38a of the convex column portion 38 of the movable scroll plate 35 and the eccentric shaft portion 42 of the drive shaft 40, the sliding part between the bearing 52a of the main shaft support portion 52 of the floating part 50 and the main shaft portion 41 of the drive shaft 40, and the sliding part between the bearing 81a of the cylindrical portion 81 of the lower bearing part 80 and the main shaft portion 41 of the drive shaft 40.

[0090] The scroll compressor 10 also includes a sliding portion (contact portion) between the scroll side contact surface 39 of the movable scroll 35 and the floating side contact surface 54 of the floating member 50. The sliding portion between the scroll side contact surface 39 and the floating side contact surface 54 is connected to the crank chamber 55. The oil passage 43 of the drive shaft 40 connects the crank chamber 55 to the oil reservoir 24.

[0091] The lubricating oil L is sucked up from the oil reservoir 24 by the oil pump 90 , flows into the crank chamber 55 through the oil passage 43 of the drive shaft 40 , and is then supplied to the sliding portion between the scroll-side contact surface 39 and the floating-side contact surface 54 via the crank chamber 55 .

[0092] (Operation of the compressor)

[0093] The operation of the scroll compressor 10 is described. When the motor 70 is working, the drive shaft 40 rotates, driving the movable scroll 35 of the compression mechanism 30. The movable scroll 35 revolves around the axis 41a of the main shaft portion 41 of the drive shaft 40 while its rotation is restricted. A low-pressure working fluid (e.g., a low-pressure refrigerant gas) flows from the suction pipe 22 into the low-pressure space Sa in the shell 20, is sucked into the compression chamber C of the compression mechanism 30 through the suction port 34a, and is compressed to become a high-pressure working fluid (e.g., a high-pressure refrigerant gas). The high-pressure working fluid flows out from the compression chamber C of the compression mechanism 30 through the discharge port 32a to the high-pressure space Sb, and is discharged to the outside of the shell 20 (e.g., the condenser 2 of the refrigerant circuit 1a) through the discharge pipe 23.

[0094] A portion of the high-pressure working fluid compressed in the compression chamber C is supplied to the first space S1 between the second annular groove 57 of the floating member 50 and the third annular groove 63 of the frame 60 through a fluid passage (not shown). Under the action of the high pressure generated in the first space S1, the floating member 50 is pushed upward in the axial direction, thereby pressing the orbiting scroll 35 against the fixed scroll 31 in the axial direction.

[0095] A portion of the working fluid that has been compressed in the compression chamber C and has become an intermediate pressure (a pressure between the low pressure and the high pressure) is supplied to the second space S2 between the first annular groove 56 of the floating member 50 and the third annular groove 63 of the frame 60 through a fluid passage (not shown). Under the action of the intermediate pressure generated in the second space S2, the floating member 50 is pushed upward in the axial direction, thereby pressing the movable scroll 35 against the fixed scroll 31 in the axial direction.

[0096] (Oil film rupture)

[0097] Figure 3 Shown in front cross-sectional view Figure 2 The crank chamber 55 and the periphery of the outer space A. By supplying high pressure or medium pressure to the back side (lower surface side) of the floating member 50, the floating member 50 axially supports the movable scroll 35 so as to axially press the movable scroll 35 against the fixed scroll 31.

[0098] The floating member 50 is not directly fixed to the casing 20 but is freely swingable relative to the casing 20 , and thus can be tilted following the tilting of the orbiting scroll 35 .

[0099] The floating-side contact surface 54 of the floating member 50 can appropriately support the scroll-side contact surface 39 of the orbiting scroll 35 while being in contact with the scroll-side contact surface 39 of the orbiting scroll 35 with almost no gap therebetween.

[0100] The lubricating oil L is supplied from the crank chamber 55 to the sliding portion between the scroll side contact surface 39 of the movable scroll 35 and the floating side contact surface 54 of the floating member 50 (see Figure 3 Arrow L) to form an oil film.

[0101] Since the working fluid G exists in the crank chamber 55 , a part of the working fluid G may be mixed into the lubricating oil L supplied from the crank chamber 55 to the sliding portion between the scroll-side contact surface 39 and the floating-side contact surface 54 .

[0102] If the working fluid G is mixed in the lubricating oil L, the oil film is easily broken at the sliding portion between the scroll side contact surface 39 and the floating side contact surface 54. The oil film breakage is mainly caused by the bubbling phenomenon in which the working fluid G dissolved in the lubricating oil L boils and bubbles.

[0103] The oil film breakdown may cause poor lubrication and seizure at the sliding portion between the scroll-side contact surface 39 and the floating-side contact surface 54 .

[0104] As described above, since the floating member 50 is tilted following the tilting of the orbiting scroll 35, there is almost no gap between the scroll side contact surface 39 and the floating side contact surface 54. Therefore, the working fluid G in the crank chamber 55 cannot pass between the scroll side contact surface 39 and the floating side contact surface 54, and cannot be released to the outer space A.

[0105] The oil film at the sliding portion between the scroll-side contact surface 39 and the floating-side contact surface 54 breaks down, and the problem lies in the special structure (floating cover structure) in which the floating member 50 follows the tilting of the orbiting scroll 35 .

[0106] The scroll compressor 10 according to the present embodiment suppresses oil film rupture in the sliding portion between the scroll-side contact surface 39 of the orbiting scroll 35 and the floating-side contact surface 54 of the floating member 50 by the following method.

[0107] (Connecting Road)

[0108] Figure 4 The floating side contact surface 54 of the floating member 50 is shown in a top view as viewed from the axial upper side. Figure 3 , Figure 4 As shown in FIG. 1 , the floating member 50 is provided with a communication passage 59. The communication passage 59 allows the crank chamber 55 and the outer space A to communicate with each other.

[0109] The communication passage 59 is constituted by a groove 59a. There is one groove 59a. The groove 59a is provided on the floating side contact surface 54 of the floating member 50. The groove 59a extends in the radial direction between the crank chamber 55 (recess 53) on the inner peripheral side and the outer space A on the outer peripheral side.

[0110] The groove portion 59a is arranged on the opposite side of the suction port 34a (indicated by a two-dot chain line) leading to the compression chamber C of the compression mechanism 30 across the drive shaft 40 in the radial direction of the drive shaft 40. Preferably, the groove portion 59a is arranged on the opposite side of the suction port 34a at 180° across the drive shaft 40.

[0111] Figure 5 The cross-sectional shape of the groove portion 59a serving as the communication passage 59 is shown. The groove portion 59a is recessed downward relative to the floating side contact surface 54 of the floating member 50. In this example, the cross-sectional shape of the groove portion 59a is a quadrilateral. Preferably, the cross-sectional area of ​​the groove portion 59a is large enough for the working fluid G to flow. The groove width of the groove portion 59a is preferably 1 mm or more, more preferably 5 mm or more, and further preferably 10 mm or more. The groove depth of the groove portion 59a is preferably 1 mm or more, more preferably 5 mm or more, and further preferably 10 mm or more.

[0112] (Function and Effect)

[0113] According to the scroll compressor 10 involved in this embodiment, the working fluid G existing in the crank chamber 55 is released to the outer space A through the communication path 59 (groove portion 59a) (see arrow G). The working fluid G is difficult to mix with the lubricating oil L supplied from the crank chamber 55 to the sliding portion between the scroll side contact surface 39 and the floating side contact surface 54.

[0114] According to the scroll compressor 10 involved in this embodiment, it is possible to suppress oil film rupture in the sliding portion between the scroll side contact surface 39 of the movable scroll 35 and the floating side contact surface 54 of the floating member 50. In addition, it is possible to suppress poor lubrication and seizure in the sliding portion between the scroll side contact surface 39 and the floating side contact surface 54.

[0115] According to the scroll compressor 10 involved in this embodiment, the problem of oil film rupture at the sliding portion between the scroll side contact surface 39 and the floating side contact surface 54 caused by the special structure (floating cover structure) in which the floating member 50 follows the overturning of the movable scroll 35 can be solved.

[0116] By providing the groove portion 59 a on the floating-side contact surface 54 , the communication path 59 can be formed very simply.

[0117] By arranging the communication passage 59 (groove portion 59a) on the opposite side of the suction port 34a in the radial direction across the drive shaft 40, the communication passage 59 (groove portion 59a) can be moved away from the suction port 34a. This can prevent the lubricating oil L from mixing with the working fluid G sucked into the compression chamber C of the compression mechanism 30 through the suction port 34a.

[0118] The oil passage 43 of the drive shaft 40 allows the crank chamber 55 to communicate with the oil reservoir 24 of the lower bottom portion 20a of the housing 20. Lubricating oil L can be introduced from the oil reservoir 24 of the lower bottom portion 20a of the housing 20 into the crank chamber 55 via the oil passage 43 of the drive shaft 40.

[0119] <Second embodiment>

[0120] The scroll compressor 10 according to the second embodiment will be described. In the following description, the same configuration as the above-mentioned embodiment is represented by the same reference numerals, and detailed descriptions are omitted. Figure 6 The periphery of the crankshaft chamber 55 and the outer space A in the second embodiment are shown in a front sectional view. Figure 7 The cross-sectional shape of the through hole 59 b serving as the communication path 59 according to the second embodiment is shown.

[0121] like Figure 6 , Figure 7As shown, a partition wall 58 formed by a wall portion of the scroll support portion 51 is provided on the floating member 50. The partition wall 58 extends in the axial direction (up and down direction). The partition wall 58 separates the crank chamber 55 from the outer space A. The floating side contact surface 54 constitutes the upper surface of the partition wall 58. The crank chamber 55 is arranged on the radial inner peripheral side of the partition wall 58 (floating side contact surface 54). The outer space A is arranged on the radial outer peripheral side of the partition wall 58 (floating side contact surface 54).

[0122] The communication path 59 is formed by a through hole 59b formed on the partition wall 58 . The through hole 59b penetrates the partition wall 58 . The through hole 59b is one.

[0123] The through hole 59b extends radially between the crank chamber 55 (recess 53) on the inner peripheral side and the outer space A on the outer peripheral side. The through hole 59b is arranged on the opposite side of the suction port 34a leading to the compression chamber C of the compression mechanism 30 with the drive shaft 40 interposed therebetween in the radial direction of the drive shaft 40.

[0124] The through hole 59b is arranged on the lower side of the floating side contact surface 54 of the floating member 50. The through hole 59b is arranged on the upper side of the lower end of the crank chamber 55 that accommodates the boss portion 38. The through hole 59b is preferably arranged on the upper side of the central portion in the axial direction (up and down direction) of the crank chamber 55. The through hole 59b is preferably arranged on the upper side of the oil level of the lubricating oil L flowing into the crank chamber 55.

[0125] In this example, the cross-sectional shape of the through hole 59b is circular. Preferably, the cross-sectional area of ​​the through hole 59b is large enough for the working fluid G to flow. The diameter of the through hole 59b is preferably greater than 1 mm, more preferably greater than 5 mm, and further preferably greater than 10 mm. The other configurations are the same as those of the first embodiment.

[0126] According to the scroll compressor 10 according to the present embodiment, by forming a through hole 59 b on the partition wall 58 that separates the crankshaft chamber 55 from the outer space A, the communication path 59 can be simply formed.

[0127] <Other embodiments>

[0128] Other embodiments will be described.

[0129] The size of the communication path 59 is not limited to the above-mentioned size. For example, the groove width and groove depth of the groove portion 59a may be less than 1 mm. The diameter of the through hole 59b may be less than 1 mm.

[0130] The cross-sectional shape of the communication path 59 is not limited to the above-mentioned shape. For example, the cross-sectional shape of the groove portion 59a may be a polygonal shape other than a quadrilateral or a circular shape. The cross-sectional shape of the through hole 59b may also be a polygonal shape.

[0131] The communication passage 59 and the suction inlet 34 a may be arranged on the same radially along the drive shaft 40 , or may be arranged in other positions.

[0132] The number of the communication passages 59 is not limited to one, and a plurality of communication passages may be provided.

[0133] The communication path 59 may also be composed of a form other than the groove portion 59a and the through hole 59b (for example, a pipe, etc.).

[0134] In the above embodiment, the outer space A is formed between the outer peripheral end of the floating side contact surface 54 of the floating member 50 and the inner peripheral wall of the housing 20, but the present invention is not limited thereto. For example, the outer space A may be formed between the outer peripheral end of the floating side contact surface 54 of the floating member 50 and the frame 60 or other components fixed to the housing 20. The outer space A may not be a part of the low-pressure space Sa, but may be a part of the high-pressure space Sb or a part of the medium-pressure space.

[0135] The scroll compressor 10 may also be a horizontal compressor. That is to say, the axial direction Z can also be in the horizontal direction.

[0136] The scroll compressor 10 may not be used in the refrigeration device 1 , and may be used as a monomer, for example.

[0137] The above embodiments are described, but it should be understood that various changes can be made to the form and details without departing from the spirit and scope of the claims. The elements involved in the above embodiments, modifications, and other embodiments can also be appropriately combined or replaced.

Claims

1. A scroll compressor, characterized in that: It comprises a compression mechanism (30), a drive shaft (40) and a floating component (50). The compression mechanism (30) comprises a fixed scroll (31) and a movable scroll (35). The drive shaft (40) includes a main shaft portion (41) and an eccentric shaft portion (42) eccentric to the main shaft portion (41). The floating member (50) pushes the movable scroll (35) against the fixed scroll (31). The movable scroll (35) comprises a scroll side contact surface (39) and a convex column portion (38). The scroll side contact surface (39) contacts the floating component (50). The boss portion (38) is provided on the inner circumference (Ri) of the scroll side contact surface (39), extends toward the floating member (50) and is connected to the eccentric shaft portion (42). The floating component (50) includes a floating side contact surface (54) and a recessed portion (53). The floating side contact surface (54) is in contact with the movable scroll (35). The recessed portion (53) is provided on the inner peripheral side (Ri) of the floating side contact surface (54) and forms a crank chamber (55) for accommodating the boss portion (38). An outer space (A) is formed on the outer peripheral side (Ro) of the floating side contact surface (54), The floating member (50) is provided with a communication passage (59) for communicating the crank chamber (55) with the outer space (A).

2. The scroll compressor according to claim 1, characterized in that: The communication passage (59) is formed by a groove portion (59a) provided on the floating side contact surface (54).

3. The scroll compressor according to claim 1, characterized in that: The floating member (50) is provided with a partition wall (58) for separating the crank chamber (55) from the outer space (A). The communication path (59) is formed by a through hole (59b) formed in the partition wall (58).

4. The scroll compressor according to claim 1, characterized in that: The communication passage (59) is arranged on the opposite side of the suction port (34a) of the drive shaft (40) in the radial direction (R) of the drive shaft (40), with respect to the suction port (34a) leading to the compression mechanism (30) across the drive shaft (40).

5. The scroll compressor according to claim 1, characterized in that: The scroll compressor comprises a housing (20), wherein the housing (20) accommodates the compression mechanism (30), the drive shaft (40) and the floating component (50). The drive shaft (40) extends in the up-down direction (Z), An oil storage portion (24) for storing oil (L) is provided at the lower bottom portion (20a) of the housing (20). The drive shaft (40) is provided with an oil passage (43) extending in the up-down direction (Z) inside (40a) of the drive shaft (40). The oil passage (43) allows the crank chamber (55) to communicate with the oil reservoir (24).

6. A refrigeration device, characterized in that: The scroll compressor comprises the scroll compressor as claimed in any one of claims 1 to 5.

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