Rotary compressor and refrigeration device

Abstract

The drive shaft (11) has a counterweight (18). A counterweight (18) is arranged between the compression mechanism (50) and the motor (25). The fixing member (30) is disposed between the compression mechanism (50) and the motor (25). The fixing member (30) has a first support section (35) and a second support section (45). The first support section (35) supports the drive shaft (11) at a position closer to the compression mechanism (50) than the counterweight (18). The second support section (45) supports the drive shaft (11) at a position closer to the motor (25) than the counterweight (18).

Description

Technical Field

[0001] The present disclosure relates to a rotary compressor and a refrigeration device. Background Art

[0002] In Patent Document 1, a scroll compressor is disclosed, which includes a compression mechanism for compressing a refrigerant, a drive shaft (crankshaft) for driving the compression mechanism, and an electric motor for rotating the drive shaft.

[0003] An upper balance weight is integrally formed with the drive shaft. The upper balance weight is disposed between a fixed member of the compression mechanism and the rotor of the electric motor. The drive shaft is supported by an upper bearing and a lower bearing provided at the fixed member so as to be rotatable freely. The drive shaft is connected to the rotor of the electric motor between the upper bearing and the lower bearing.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Laid-Open Gazette No. 2016-050549 Summary of the Invention

[0007] -Technical Problem to be Solved by the Invention-

[0008] In the scroll compressor of Patent Document 1, the upper bearing and the lower bearing are separately arranged with the electric motor therebetween. When the centrifugal force of the upper balance weight becomes large, the drive shaft may be deflected within the range from the upper bearing to the lower bearing.

[0009] The object of the present disclosure is to suppress the deflection of the drive shaft due to the centrifugal force of the balance weight.

[0010] -Technical Solution for Solving the Technical Problem-

[0011] A first aspect of the present disclosure relates to a rotary compressor, which includes a compression mechanism 50, a drive shaft 11, and a motor 25. The compression mechanism 50 compresses a refrigerant. The drive shaft 11 drives the compression mechanism 50. The motor 25 rotates the drive shaft 11. The rotary compressor includes a support member 30 and a balance weight 18. The support member 30 is disposed between the compression mechanism 50 and the motor 25. The support member 30 supports the drive shaft 11 in a rotatable manner. The balance weight 18 is provided on the drive shaft 11 and is disposed between the compression mechanism 50 and the motor 25. The support member 30 has a first support portion 35 and a second support portion 45. The first support portion 35 supports the drive shaft 11 at a position closer to the compression mechanism 50 than the balance weight 18. The second support portion 45 supports the drive shaft 11 at a position closer to the motor 25 than the balance weight 18.

[0012] In the first aspect, by supporting the drive shaft 11 at a position closer to the compression mechanism 50 than the balance weight 18 and at a position closer to the motor 25 than the balance weight 18, it is possible to suppress the drive shaft 11 from deflecting due to the centrifugal force of the balance weight 18.

[0013] A second aspect of the present disclosure is based on the rotary compressor of the first aspect. An axial length L1 of a portion of the drive shaft 11 supported by the first support portion 35 and an axial length L2 of a portion of the drive shaft 11 supported by the second support portion 45 satisfy the condition of L1≥L2.

[0014] In the second aspect, by making the axial length of the portion of the drive shaft 11 supported by the first support portion 35 the same as the axial length of the portion of the drive shaft 11 supported by the second support portion 45, or making the axial length of the portion of the drive shaft 11 supported by the first support portion 35 longer than the axial length of the portion of the drive shaft 11 supported by the second support portion 45, it is possible to increase the contact area between the first support portion 35 disposed closer to the compression mechanism 50 and the drive shaft 11, thereby effectively suppressing the drive shaft 11 from deflecting due to the centrifugal force of the balance weight 18.

[0015] A third aspect of the present disclosure is based on the rotary compressor of the first or second aspect. The rotary compressor includes a first bearing 37 and a second bearing 47. The first bearing 37 is provided at the first support portion 35 and supports the drive shaft 11. The second bearing 47 is provided at the second support portion 45 and supports the drive shaft 11.

[0016] In the third aspect, by supporting the drive shaft 11 by the first bearing 37 and the second bearing 47, it is possible to make the drive shaft 11 rotate smoothly.

[0017] Based on the rotary compressor according to any one of the first to third aspects of the present disclosure, the rotary compressor includes a housing 20 that houses the compression mechanism 50. The support member 30 has a first fixed member main body 31 and a second fixed member main body 41. The first fixed member main body 31 has the first support portion 35, and the second fixed member main body 41 has the second support portion 45. The first fixed member main body 31 is fixed to the housing 20, and the second fixed member main body 41 is fixed to the first fixed member main body 31.

[0018] In the fourth aspect, by forming the first fixed member main body 31 having the first support portion 35 and the second fixed member main body 41 having the second support portion 45 with different components, the assembly workability is improved. In addition, since the first fixed member main body 31 and the second fixed member main body 41 are combined together, the surroundings of the balance weight 18 are enclosed by the first fixed member main body 31 and the second fixed member main body 41, so that the flow of the refrigerant in the housing 20 can be prevented from being disturbed by the rotation of the balance weight 18.

[0019] The fifth aspect of the present disclosure relates to a refrigeration device including the rotary compressor 10 according to any one of the first to fourth aspects and a refrigerant circuit 1a through which the refrigerant compressed by the rotary compressor 10 flows.

[0020] In the fifth aspect, a refrigeration device 1 including the rotary compressor 10 can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a refrigerant circuit diagram showing the structure of the refrigeration device of the present embodiment;

[0022] Figure 2 is a longitudinal sectional view showing the structure of the scroll compressor;

[0023] Figure 3 is a side sectional view showing the structures of the first fixed member main body and the second fixed member main body;

[0024] Figure 4 is a longitudinal sectional view showing the structure of the scroll compressor according to this modification. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] As Figure 1As shown, a scroll compressor 10, which is a rotary compressor, is provided in a refrigeration device 1. The refrigeration device 1 has a refrigerant circuit 1a filled with a refrigerant. The refrigerant circuit 1a has a scroll compressor 10, a radiator 3, a decompression mechanism 4, and an evaporator 5. The decompression mechanism 4 is, for example, an expansion valve. The refrigerant circuit 1a performs a vapor compression refrigeration cycle.

[0026] The refrigeration device 1 is an air conditioner. The air conditioner can be a refrigeration-only machine, a heating-only machine, or an air conditioner that can switch between refrigeration and heating. In this case, the air conditioner has a switching mechanism (such as a four-way reversing valve) for switching the circulation direction of the refrigerant. The refrigeration device 1 can also be a water heater, a cooling unit, a cooling device for cooling the air in a storage room, etc. The cooling device cools the air inside a cold storage, a freezer, a container, etc.

[0027] As Figure 2 shown, the scroll compressor 10 includes a housing 20, a motor 25, and a compression mechanism 50. The housing 20 is formed in a cylindrical shape with a relatively long longitudinal length and is configured as a hermetic dome-shaped housing. The motor 25 and the compression mechanism 50 are housed in the housing 20.

[0028] The motor 25 has a stator 26 and a rotor 27. The stator 26 is fixed on the inner peripheral surface of the housing 20. The rotor 27 is arranged inside the stator 26. The drive shaft 11 penetrates through the rotor 27. The rotor 27 is fixed on the drive shaft 11. A lower counterweight 28 is provided at the lower part of the rotor 27. The lower counterweight 28 is covered by a lower cover 29.

[0029] An oil storage part 21 is provided at the bottom of the housing 20. Lubricating oil is stored in the oil storage part 21. An intake pipe 12 is connected to the upper part of the housing 20. A discharge pipe 13 is connected to the trunk part of the housing 20. The inflow end of the discharge pipe 13 communicates with a discharge space 23 above the motor 25.

[0030] The drive shaft 11 extends in the vertical direction along the central axis of the housing 20. The drive shaft 11 has a main shaft part 14, an eccentric part 15, and a balance weight 18.

[0031] The eccentric part 15 is provided at the upper end of the main shaft part 14. The balance weight 18 is arranged between the compression mechanism 50 and the motor 25.

[0032] The lower part of the main shaft part 14 is supported by a lower bearing 22 so as to be rotatable. The lower bearing 22 is fixed on the inner peripheral surface of the housing 20. A positive displacement pump 24 is provided, for example, on the lower bearing 22. The main shaft part 14 penetrates through a fixing part 30 serving as a supporting member and is supported by a first supporting part 35 and a second supporting part 45 of the fixing part 30 described later so as to be rotatable.

[0033] A fixing member 30 is fixed to the housing 20. The fixing member 30 is disposed above the motor 25. The compression mechanism 50 is disposed above the fixing member 30.

[0034] The fixing member 30 has a first fixing member main body 31 and a second fixing member main body 41. The first fixing member main body 31 is disposed at a position closer to the compression mechanism 50 than the second fixing member main body 41.

[0035] The first fixing member main body 31 is fixed to the inner peripheral surface of the housing 20, for example, by press fitting. It should be noted that the first fixing member main body 31 can also be fixed to the inner peripheral surface of the housing 20 by bolt fastening, welding, etc.

[0036] On the first fixing member main body 31, a recess 32, a first fitting portion 34, and a first support portion 35 are provided. The recess 32 is formed by depressing a part of the upper surface of the first fixing member main body 31. A flange portion 73 of a later-described moving scroll plate 70 is disposed in the recess 32.

[0037] The first fitting portion 34 is formed by protruding a part of the lower surface of the first fixing member main body 31. The first fitting portion 34 is fitted with a later-described second fitting portion 44 of the second fixing member main body 41.

[0038] The first support portion 35 supports the drive shaft 11 at a position closer to the compression mechanism 50 than the balance weight 18. The first support portion 35 is formed by a part of the first fixing member main body 31 below the bottom surface of the recess 32. A first through hole 36 penetrating the first support portion 35 in the axial direction is provided in the first support portion 35. A cylindrical first bearing 37 is provided in the first through hole 36. The first bearing 37 is a metal bearing, for example. It should be noted that the first bearing 37 can also be constituted by a rolling bearing.

[0039] The first support portion 35 supports the drive shaft 11 via the first bearing 37 in a rotatable manner. It should be noted that the first bearing 37 may not be provided, and the inner peripheral surface of the first through hole 36 of the first support portion 35 may be used to support the drive shaft 11 in a rotatable manner.

[0040] Threaded holes 38 are provided on the lower surface of the first fixing member main body 31. A plurality of threaded holes 38 are provided at intervals in the circumferential direction of the first fixing member main body 31.

[0041] On the second fixing member main body 41, a receiving recess 42, a flange portion 43, a second fitting portion 44, and a second support portion 45 are provided.

[0042] The accommodation recess 42 is formed by recessing a part of the upper surface of the second fixing member main body 41. The counterweight 18 is accommodated in the accommodation recess 42. The counterweight 18 can rotate within the accommodation recess 42.

[0043] The flange portion 43 projects radially outward from the upper end portion of the second fixing member main body 41. A plurality of insertion holes 48 corresponding to the plurality of threaded holes 38 of the first fixing member main body 31 are formed in the flange portion 43.

[0044] The second fitting portion 44 extends along the outer peripheral edge of the flange portion 43 and projects upward. The second fitting portion 44 restricts the second fixing member main body 41 from moving radially relative to the first fixing member main body 31 by fitting with the first fitting portion 34.

[0045] The second support portion 45 supports the drive shaft 11 at a position closer to the motor 25 than the counterweight 18. The second support portion 45 is constituted by a portion of the second fixing member main body 41 that is lower than the bottom surface of the accommodation recess 42. A second through hole 46 that penetrates the second support portion 45 in the axial direction is provided in the second support portion 45. A cylindrical second bearing 47 is provided in the second through hole 46. The second bearing 47 is, for example, a metal bearing. It should be noted that the second bearing 47 may also be constituted by a rolling bearing.

[0046] The second support portion 45 supports the drive shaft 11 via the second bearing 47 in such a manner that the drive shaft 11 can rotate. It should be noted that the second bearing 47 may not be provided, and the inner peripheral surface of the second through hole 46 of the second support portion 45 may be used to support the drive shaft 11 in such a manner that the drive shaft 11 can rotate.

[0047] By combining the first fixing member main body 31 having the first support portion 35 and the second fixing member main body 41 having the second support portion 45, the periphery of the counterweight 18 is surrounded by the first fixing member main body 31 and the second fixing member main body 41.

[0048] Specifically, as Figure 3 shown, the second fitting portion 44 of the second fixing member main body 41 is fitted with the first fitting portion 34 of the first fixing member main body 31. Then, by inserting the fastening bolt 49 into the insertion hole 48 from the side of the flange portion 43 and screwing it into the threaded hole 38, the second fixing member main body 41 is fastened and fixed to the first fixing member main body 31.

[0049] Thus, the position of the second support portion 45 relative to the first support portion 35 in the radial direction can be positioned, and the movement of the second support portion 45 in the radial direction can be suppressed. It should be noted that the first fitting portion 34 and the second fitting portion 44 may not be provided. For example, by providing a positioning pin (not shown), the positioning of the second support portion 45 relative to the first support portion 35 can be achieved.

[0050] Here, it is preferable to set the axial length L1 of the portion of the drive shaft 11 supported by the first support portion 35 and the axial length L2 of the portion of the drive shaft 11 supported by the second support portion 45 to satisfy the condition L1 ≥ L2.

[0051] In this way, by increasing the contact area between the first bearing 37 of the first support portion 35 arranged on the side closer to the compression mechanism 50 and the drive shaft 11, the deflection of the drive shaft 11 due to the centrifugal force of the balance weight 18 can be effectively suppressed.

[0052] The compression mechanism 50 includes a stationary scroll 60 and a movable scroll 70. The stationary scroll 60 is fixed to the upper surface of the fixed member 30. The movable scroll 70 is arranged between the stationary scroll 60 and the fixed member 30.

[0053] The stationary scroll 60 has a stationary-side end plate 61, a stationary-side scroll 62, and an outer peripheral wall 63. The outer peripheral wall 63 is formed in a substantially cylindrical shape. The outer peripheral wall 63 is erected on the outer edge of the front surface ( Figure 2 the lower surface in this case) of the stationary-side end plate 61.

[0054] The stationary-side scroll 62 is formed in a scroll shape. The stationary-side scroll 62 is erected at a position inside the outer peripheral wall 63 on the stationary-side end plate 61.

[0055] The stationary-side end plate 61 is located on the outer peripheral side and is formed in connection with the stationary-side scroll 62. The top surface of the stationary-side scroll 62 and the top surface of the outer peripheral wall 63 are formed to be substantially flush. The stationary scroll 60 is fixed to the fixed member 30.

[0056] The movable scroll 70 has a movable-side end plate 71, a movable-side scroll 72, and a flange portion 73. The movable-side scroll 72 is formed in a scroll shape. The movable-side scroll 72 is formed on the upper surface of the movable-side end plate 71. The movable-side scroll 72 meshes with the stationary-side scroll 62.

[0057] The flange portion 73 is formed at the center of the lower surface of the movable-side end plate 71. The eccentric portion 15 of the drive shaft 11 is inserted into the flange portion 73, so that the drive shaft 11 is connected to the flange portion 73.

[0058] An Oldham coupling 55 is provided at the upper part of the fixed member 30. The Oldham coupling 55 prevents the moving scroll disk 70 from rotating on its own. A key 56 is provided on the Oldham coupling 55. The key 56 protrudes toward the lower surface side of the moving side end plate 71 of the moving scroll disk 70. A keyway 57 is formed on the lower surface of the moving side end plate 71 of the moving scroll disk 70. The key 56 of the Oldham coupling 55 is slidably fitted into the keyway 57.

[0059] It should be noted that although not shown in the figure, a key is also provided on the fixed member 30 side of the Oldham coupling 55, and the key on the fixed member 30 side is slidably fitted into a keyway (not shown in the figure) of the fixed member 30.

[0060] The compression mechanism 50 has a fluid chamber S into which the refrigerant flows. The fluid chamber S is formed between the stationary scroll disk 60 and the moving scroll disk 70. The moving scroll disk 70 is arranged such that the moving side scroll 72 meshes with the stationary side scroll 62 of the stationary scroll disk 60. Here, the lower surface of the outer peripheral wall 63 of the stationary scroll disk 60 becomes the opposing surface facing the moving scroll disk 70. In addition, the upper surface of the moving side end plate 71 of the moving scroll disk 70 becomes the opposing surface facing the stationary scroll disk 60.

[0061] An intake port 64 is formed on the outer peripheral wall 63 of the stationary scroll disk 60. The intake port 64 opens near the end of the winding of the stationary side scroll 62. The intake port 64 is connected to the downstream end of the suction pipe 12.

[0062] An outlet port 65 is formed at the center of the stationary side end plate 61 of the stationary scroll disk 60. The outlet port 65 opens on the upper surface of the stationary side end plate 61 of the stationary scroll disk 60. The high-pressure gaseous refrigerant discharged from the outlet port 65 flows through a passage (not shown in the figure) formed in the fixed member 30 to the discharge space 23.

[0063] An oil supply passage 16 is formed inside the drive shaft 11. The oil supply passage 16 extends vertically from the lower end of the drive shaft 11 to the upper end of the drive shaft 11. The lower end portion of the drive shaft 11 is connected to the pump 24. The lower end portion of the pump 24 is immersed in the oil storage portion 21. The pump 24 sucks up the lubricating oil from the oil storage portion 21 as the drive shaft 11 rotates and delivers the lubricating oil to the oil supply passage 16. The oil supply passage 16 supplies the lubricating oil in the oil storage portion 21 to the sliding surfaces between the lower bearing 22 and the drive shaft 11, between the first bearing 37 and the drive shaft 11, and between the second bearing 47 and the drive shaft 11, and also supplies the lubricating oil to the sliding surface between the flange portion 73 and the drive shaft 11. The oil supply passage 16 opens on the upper end surface of the drive shaft 11 and supplies the lubricating oil upward of the drive shaft 11.

[0064] The recessed portion 32 of the fixed member 30 is connected to the oil supply passage 16 in the drive shaft 11 via the interior of the flange portion 73 of the movable scroll 70. By supplying high-pressure lubricating oil to the recessed portion 32, a high pressure equivalent to the discharge pressure of the compression mechanism 50 acts on the recessed portion 53. The movable scroll 70 is pressed against the fixed scroll 60 by the high pressure of the recessed portion 32.

[0065] An oil passage (not shown) is formed inside the stationary member 30 and the fixed scroll 60 . The oil passage supplies the high-pressure lubricating oil in the recess 32 to the facing surface between the movable-side end plate 71 of the movable scroll 70 and the outer peripheral wall 63 of the fixed scroll 60 .

[0066] - Operation -

[0067] The basic operation of the scroll compressor 10 will be described. Figure 2 When the motor 25 is operated, the drive shaft 11 to which the rotor 27 is fixed is driven to rotate. In addition, since the Oldham coupling 55 prevents the movable scroll 70 from rotating, the movable scroll 70 rotates around the axis of the drive shaft 11.

[0068] When the movable scroll 70 rotates, the refrigerant is compressed in the fluid chamber S. The high-pressure gas refrigerant compressed in the fluid chamber S is discharged from the discharge port 65 and flows into the discharge space 23 through a passage (not shown) formed in the fixed member 30. The high-pressure gas refrigerant in the discharge space 23 is discharged to the outside of the casing 20 through the discharge pipe 13.

[0069] As the drive shaft 11 rotates, the high-pressure lubricating oil in the oil reservoir 21 is sucked up by the pump 24 and flows upward in the oil supply passage 16 in the drive shaft 11 , and flows from the upper end opening of the eccentric portion 15 of the drive shaft 11 into the interior of the flange portion 73 of the orbiting scroll 70 .

[0070] The lubricating oil supplied to the flange portion 73 flows to the recessed portion 32 of the fixed member 30 through the gap between the eccentric portion 15 of the drive shaft 11 and the flange portion 73. As a result, the recessed portion 32 of the fixed member 30 becomes a high-pressure environment equivalent to the discharge pressure of the compression mechanism 50. Under the high pressure of the recessed portion 32, the orbiting scroll 70 is pressed against the fixed scroll 60.

[0071] - Effects of implementation -

[0072] According to the features of this embodiment, the drive shaft 11 is supported at a position closer to the compression mechanism 50 than the counterweight 18 and at a position closer to the motor 25 than the counterweight 18, respectively, thereby suppressing the drive shaft 11 from being bent due to the centrifugal force of the counterweight 18. As a result, the surface pressure of the drive shaft 11 can be suppressed from being locally increased, thereby improving reliability and enabling the scroll compressor 10 to operate at high speed.

[0073] According to the characteristics of the present embodiment, by making the axial length of the portion of the drive shaft 11 supported by the first support portion 35 the same as the axial length of the portion of the drive shaft 11 supported by the second support portion 45, or making the axial length of the portion of the drive shaft 11 supported by the first support portion 35 longer than the axial length of the portion of the drive shaft 11 supported by the second support portion 45, it is possible to increase the contact area between the first support portion 35 disposed closer to the compression mechanism 50 and the drive shaft 11, thereby effectively suppressing the deflection of the drive shaft 11 due to the centrifugal force of the balance weight 18.

[0074] According to the characteristics of the present embodiment, by supporting the drive shaft 11 by the first bearing 37 and the second bearing 47, the drive shaft 11 can be rotated smoothly.

[0075] According to the characteristics of the present embodiment, by forming the first fixed part main body 31 having the first support portion 35 and the second fixed part main body 41 having the second support portion 45 from different components, the assembly workability is improved. In addition, since the first fixed part main body 31 and the second fixed part main body 41 are combined, the periphery of the balance weight 18 is surrounded by the first fixed part main body 31 and the second fixed part main body 41, so that the flow of the refrigerant in the housing 20 can be prevented from being disturbed by the rotation of the balance weight 18.

[0076] According to the characteristics of the present embodiment, a refrigeration device 1 can be provided, which includes a rotary compressor 10 and a refrigerant circuit 1a through which the refrigerant compressed by the rotary compressor 10 flows.

[0077] (Modified example)

[0078] Hereinafter, the same parts as those in the above embodiment are denoted by the same reference numerals, and only the different parts will be described.

[0079] As Figure 4 shown, the drive shaft 11 has a balance weight 18. The balance weight 18 is disposed between the compression mechanism 50 and the motor 25.

[0080] The balance weight 18 has a weight protrusion 19. The weight protrusion 19 is formed by protruding a part of the upper surface of the balance weight 18. The weight protrusion 19 extends along the outer peripheral edge of the balance weight 18 and protrudes upward.

[0081] The fixed part 30 has a first fixed part main body 31 and a second fixed part main body 41. The balance weight 18 is housed in the housing recess 42 of the second fixed part main body 41.

[0082] A ring groove 39 is provided on the lower surface of the first fixed part main body 31. The counterweight protrusion 19 is arranged to enter the ring groove 39. The groove width and groove depth of the ring groove 39 are set such that when the balance weight 18 rotates, the counterweight protrusion 19 does not interfere with the first fixed part main body 31.

[0083] Thus, by providing the counterweight protrusion 19 along the outer peripheral edge of the balance weight 18, the overall weight of the balance weight 18 can be increased.

[0084] The above has described the embodiments and modification examples, but it should be understood that various changes can be made to the manner and specific matters without departing from the gist and scope of the claims. It is also possible to appropriately combine or replace the elements involved in the above embodiments, modification examples, and other embodiments. The words "first", "second", "third",... in the specification and claims are only used to distinguish the statements containing these words, and do not limit the quantity or order of the statements.

[0085] -Industrial Applicability-

[0086] In summary, the present disclosure is useful for a rotary compressor and a refrigeration device.

[0087] -Symbol Explanation-

[0088] 1 Refrigeration device

[0089] 1a Refrigerant circuit

[0090] 10 Scroll compressor (rotary compressor)

[0091] 11 Drive shaft

[0092] 18 Balance weight

[0093] 20 Housing

[0094] 25 Motor

[0095] 30 Fixed part (support part)

[0096] 31 First fixed part main body

[0097] 35 First support part

[0098] 37 First bearing

[0099] 41 Second fixed part main body

[0100] 45 Second support part

[0101] 47 Second bearing

[0102] 50 Compression mechanism

Claims

1. A rotary compressor, comprising a compression mechanism (50), a drive shaft (11), and a motor (25), wherein the compression mechanism (50) compresses a refrigerant, the drive shaft (11) drives the compression mechanism (50), and the motor (25) rotates the drive shaft (11), characterized in that: The rotary compressor includes a support member (30) and a balance weight (18). The support member (30) is disposed between the compression mechanism (50) and the motor (25), and the support member (30) supports the drive shaft (11) in a rotatable manner. The balance weight (18) is provided on the drive shaft (11) and is disposed between the compression mechanism (50) and the motor (25). The support member (30) has a first support portion (35) and a second support portion (45). The first support portion (35) supports the drive shaft (11) at a position closer to the compression mechanism (50) than the balance weight (18), and the second support portion (45) supports the drive shaft (11) at a position closer to the motor (25) than the balance weight (18).

2. The rotary compressor according to claim 1, characterized in that: An axial length L1 of a portion of the drive shaft (11) supported by the first support portion (35) and an axial length L2 of a portion of the drive shaft (11) supported by the second support portion (45) satisfy the condition of L1≥L2.

3. The rotary compressor according to claim 1 or 2, characterized in that: The rotary compressor includes a first bearing (37) and a second bearing (47). The first bearing (37) is provided at the first support portion (35) and supports the drive shaft (11). The second bearing (47) is provided at the second support portion (45) and supports the drive shaft (11).

4. The rotary compressor according to any one of claims 1 to 3, characterized in that: The rotary compressor includes a housing (20) that houses the compression mechanism (50). The support member (30) has a first fixed member main body (31) and a second fixed member main body (41). The first fixed member main body (31) has the first support portion (35), and the second fixed member main body (41) has the second support portion (45). The first fixed member main body (31) is fixed to the housing (20). The second fixed member main body (41) is fixed to the first fixed member main body (31).

5. A refrigeration device, characterized in that: The refrigeration device includes: the rotary compressor (10) according to any one of claims 1 to 4, and a refrigerant circuit (1a) through which the refrigerant compressed by the rotary compressor (10) flows.

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