Horizontal rotary compressor

Abstract

To provide a horizontal rotary compressor capable of performing sealability between a shaft hole and a rotation shaft while securing lubricity of the rotation shaft to the shaft hole.SOLUTION: A horizontal rotary compressor 1 has: a rotation shaft 30; an electric motor part 40; a compression mechanism part 50; a front housing 14 housing the electric motor part 40; a rear housing 16 housing the compression mechanism part 50; a partition wall part 121 arranged between the front housing 14 and the rear housing 16; and a bushing 22A arranged between the inner periphery of the first shaft hole 121b and the outer periphery of the rotation shaft 30. The shaft hole 121b has a stepped columnar shape such that it is formed into a small diameter part SD on the front housing 14 side and a large diameter part LD on the rear housing 16 side. The bushing 22A, on which an abutment part AP extending in an axial direction is formed, is inserted from the large diameter part LD side until it abuts to a step part SP shifted from the large diameter part LD of the shaft hole 121b to the small diameter part SD.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a horizontally-mounted rotary compressor.

Background Art

[0002] In a rotary compressor, as described in Japanese Unexamined Patent Application Publication No. 2005-180600 (Patent Document 1), a housing houses a rotating shaft, an electric motor unit that rotates the rotating shaft, and a compression mechanism unit that is driven by the rotating shaft. The rotating shaft is rotatably supported by a shaft hole of the housing or a member integrated therewith via a bush (bearing metal) in which a notch portion extending in the axial direction is formed. Here, the notch portion extending in the axial direction of the bush functions to supply lubricating oil to the outer peripheral surface of the rotating shaft.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, some rotary compressors have a partition wall portion that divides the inside of the housing into a low-pressure chamber and a high-pressure chamber. In this case, when the rotating shaft is rotatably supported by a bush with a notch portion inserted into the shaft hole of the partition wall portion, lubricating oil flows from the high-pressure chamber to the low-pressure chamber, and as a result, it becomes difficult to ensure the sealing property of the rotating shaft with respect to the shaft hole.

[0005] Therefore, an object of the present invention is to provide a horizontally-mounted rotary compressor capable of ensuring the lubricity of the rotating shaft with respect to the shaft hole and exhibiting the sealing property between the shaft hole and the rotating shaft.

Means for Solving the Problems

[0006] The horizontal rotary compressor has a rotating shaft arranged horizontally, an electric motor section for rotating the rotating shaft, a compression mechanism section driven by the rotating shaft, a bottomed cylindrical first housing for housing the electric motor section, a bottomed cylindrical second housing for housing the compression mechanism section, a partition section arranged between the open end side of the first housing and the open end side of the second housing, and a bush arranged between the inner peripheral surface of the shaft hole of the partition section and the outer peripheral surface of the rotating shaft. A shaft hole through which an intermediate portion of the rotating shaft penetrates is formed in the partition section. An oil passage extending in the axial direction thereof is formed at a portion of the bush facing the outer peripheral surface of the rotating shaft. The shaft hole of the partition section has a stepped cylindrical shape in which the portion located on the first housing side is a small diameter portion and the portion located on the second housing side is a large diameter portion. Further, the bush is inserted from the large diameter portion of the shaft hole until it abuts against an annular stepped portion that transitions from the large diameter portion to the small diameter portion of the shaft hole.

Effects of the Invention

[0007] According to the present invention, in a horizontal rotary compressor, it is possible to ensure lubricity of the rotating shaft with respect to the shaft hole and to exhibit sealing performance between the shaft hole and the rotating shaft.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the attached drawings. FIG. 1 and FIG. 2 show an example of a horizontal rotary compressor (hereinafter referred to as "rotary compressor") 1 to which the present invention is applied. Note that the rotary compressor 1 described below is merely an example, and should not be construed as being limited to its configuration. Therefore, it should be noted that the present invention can be applied to various rotary compressors well-known to those skilled in the art.

[0010] The rotary compressor 1 has a housing 10. The housing 10 includes a cylindrical center housing 12, a bottomed cylindrical front housing 14 whose open end side is joined to the front end (left end in FIG. 1) of the center housing 12, and a bottomed cylindrical rear housing 16 whose open end side is joined to the rear end (right end in FIG. 1) of the center housing 12. The center housing 12, the front housing 14, and the rear housing 16 are formed with substantially the same diameter. Note that the center housing 12, the front housing 14, and the rear housing 16 are not limited to a configuration having a cylindrical cross-section, and may be formed in a tubular shape having an arbitrary cross-section such as a quadrilateral or a polygon, for example.

[0011] The interior of the housing 10 is partitioned by a partition portion 121 provided integrally with the center housing 12 into a first accommodation chamber 18 on the front housing 14 side and a second accommodation chamber 20 on the rear housing 16 side. The first accommodation chamber 18 is formed by the center housing 12 and the front housing 14. The second accommodation chamber 20 is formed by the center housing 12 and the rear housing 16. Here, a part of the center housing 12 and the front housing 14 located on the front side of the partition portion 121 can be cited as an example of the first housing. Also, a part of the center housing 12 and the rear housing 16 located on the rear side of the partition portion 121 can be cited as an example of the second housing.

[0012] In the central portion in the radial direction of the partition portion 121, a cylindrical boss portion 121a protruding toward the first accommodation chamber 18 is formed. Further, in the central portion in the radial direction of the boss portion 121a, a first shaft hole 121b having a stepped cylindrical outer peripheral surface that penetrates from the tip surface to the surface on the second accommodation chamber 20 side is formed. Specifically, as shown in FIG. 3, in the first shaft hole 121b, a predetermined length of the portion located on the first accommodation chamber 18 side is formed as a small diameter portion SD, and the remaining portion located on the second accommodation chamber 20 side is formed as a large diameter portion LD. And, a cylindrical bush 22A is inserted into the first shaft hole 121b from the large diameter portion LD side of the first shaft hole 121b until it abuts against an annular step portion SP that transitions from the large diameter portion LD to the small diameter portion SD. Here, the inner diameter of the bush 22A can be made substantially the same as the inner diameter of the small diameter portion SD of the first shaft hole 121b.

[0013] The bush 22A is, for example, a cylindrical member in which the ends of a rectangular iron plate are butted against each other, and has a butting portion AP that extends in the axial direction thereof. This butting portion AP functions as an oil passage for lubricating oil, as will be described later. Therefore, the butting portion AP of the bush 22A is not limited to a configuration that extends in the axial direction of the bush 22A, and may be stepped as shown in FIG. 4, linearly extending obliquely as shown in FIG. 5, rectangular wave-shaped as shown in FIG. 6, etc. (the same applies hereinafter). In this way, the total length of the oil passage becomes longer than that of the linear butting portion AP, and thereby, a large amount of lubricating oil can be retained.

[0014] The intermediate portion of the rotating shaft 30 extending in the horizontal direction (front-rear direction) is rotatably inserted into the small-diameter portion SD of the first shaft hole 121b and the bush 22A. One end (front end) side of the rotating shaft 30 is located within the first housing chamber 18. The other end (rear end) side of the rotating shaft 30 is located within the second housing chamber 20. A minute interval (clearance) is formed between the inner peripheral surfaces of the small-diameter portion SD of the first shaft hole 121b and the bush 22A and the outer peripheral surface of the rotating shaft 30. This minute interval is set such that the rotating shaft 30 can rotate with respect to the inner peripheral surfaces of the small-diameter portion SD of the first shaft hole 121b and the bush 22A and can be sealed (sealed) by lubricating oil. Incidentally, the minute interval can also be set by changing the rank of the dimensional accuracy of the bush 22A.

[0015] The first housing chamber 18 houses an electric motor unit 40 for rotating the rotating shaft 30. Further, the first housing chamber 18 communicates with the low-pressure side of an external refrigerant circuit (not shown) via a suction port 24 formed at a predetermined position of the front housing 14. Although the suction port 24 opens at a position above the rotating shaft 30 and on the side opposite to the partition wall portion 121 with the electric motor unit 40 interposed therebetween, the suction port 24 may open at an arbitrary position of the front housing 14 facing the inside of the first housing chamber 18.

[0016] The electric motor unit 40 includes a stator 42 and a rotor 44.

[0017] The stator 42 is fixed to the inner peripheral surface of the housing 10. Specifically, the stator 42 is fixed to the inner peripheral surface of a portion located on the front housing 14 side with respect to the partition wall portion 121 of the center housing 12. The stator 42 includes a stator core 42a formed in a cylindrical shape from a magnetic material and a stator coil 42b wound around the teeth portion of the stator core 42a.

[0018] The rotor 44 is disposed with a predetermined gap inside the stator 42 in the radial direction. Permanent magnets are incorporated in the rotor 44. The rotor 44 is formed in a cylindrical shape, and the front end side of the rotating shaft 30 penetrates through the hollow portion thereof and is integrally fixed to the rotating shaft 30.

[0019] The electric motor unit 40 is configured such that the rotor 44 rotates when power is supplied to the stator coil 42b of the stator 42 via the hermetic terminal portion 46 provided at a predetermined location of the front housing 14, thereby rotating the rotary shaft 30.

[0020] The second housing chamber 20 houses a compression mechanism portion 50 driven by the rotary shaft 30. The second housing chamber 20 communicates with the high-pressure side of an external cooling circuit via a discharge port 26 formed at a predetermined location of the rear housing 16. Specifically, the discharge port 26 opens at substantially the same position as the rotary shaft 30 in the height direction (vertical direction). However, the discharge port 26 may open at any position of the rear housing 16 facing the inside of the second housing chamber 20.

[0021] The lower portion of the second housing chamber 20, that is, the lower portion of the rear housing 16, constitutes a lubricating oil storage portion in which the lubricating oil OL for lubricating at least the compression mechanism portion 50 is stored. Here, the lubricating oil OL is mainly stored in the second housing chamber 20.

[0022] The compression mechanism portion 50 has an outer shape smaller than the inner diameter of the rear housing 16. Also, the lower portion of the compression mechanism portion 50 is immersed in the lubricating oil OL stored in the lubricating oil storage portion, that is, is located below the oil level of the lubricating oil OL.

[0023] The compression mechanism portion 50 includes a first compression mechanism portion 54A and a second compression mechanism portion 54B disposed on both sides in the front-rear direction with the intermediate partition plate 52 interposed therebetween. The first compression mechanism portion 54A is disposed on the partition wall portion 121 side of the intermediate partition plate 52, that is, on the front side. The second compression mechanism portion 54B is disposed on the side opposite to the partition wall portion 121 side of the intermediate partition plate 52, that is, on the rear side. A through hole 52a through which the rotary shaft 30 passes is formed at the radially central portion of the intermediate partition plate 52.

[0024] As shown in FIG. 2, the first compression mechanism portion 54A includes a first cylinder 56A, a first rolling piston 58A, and a first vane 60A.

[0025] One surface (front surface) of the first cylinder 56A is in close contact with the surface of the partition wall portion 121 on the second accommodation chamber 20 side. The other surface (rear surface) of the first cylinder 56A is in close contact with the surface of the intermediate partition plate 52 on the partition wall portion 121 side. The first cylinder 56A has a first cylinder chamber 64A with a circular cross-section at the central portion in the radial direction.

[0026] The first rolling piston 58A is attached to the first eccentric portion 30a of the rotating shaft 30 and is located within the first cylinder chamber 64A of the first cylinder 56A. The first rolling piston 58A eccentrically rotates within the first cylinder chamber 64A of the first cylinder 56A as the rotating shaft 30 rotates.

[0027] The first vane 60A is biased toward the first rolling piston 58A by the first coil spring 66A. Here, the first coil spring 66A is cited as an example of a biasing member. The first vane 60A abuts against the outer peripheral surface of the first rolling piston 58A and divides the inside of the first cylinder chamber 64A into a low-pressure chamber communicating with a first suction port (not shown) and a high-pressure chamber communicating with a first discharge port (not shown). The first suction port and the first discharge port are provided below the rotating shaft 30 and are formed in the first cylinder 56A so as to extend radially outward from the first cylinder chamber 64A.

[0028] Further, on the surface of the partition wall portion 121 on the side of the first accommodation chamber 18, a first recess (not shown) is formed so as to surround the boss portion 121a. The opening of the first recess is closed by an annular first closing plate 68 that is in close contact with the surface of the partition wall portion 121 on the side of the first accommodation chamber 18. As a result, a first discharge soundproof chamber 70A partitioned from the first accommodation chamber 18 is formed in the partition wall portion 121. That is, the internal space of the first recess constitutes the first discharge soundproof chamber 70A. The first discharge soundproof chamber 70A communicates with a first discharge port that communicates with a high-pressure chamber in the first cylinder chamber 64A via a first communication hole (not shown) formed in the bottom wall of the first recess of the partition wall portion 121. Further, a first discharge valve in the form of a reed valve (not shown) is disposed at a location on the bottom wall of the first recess of the partition wall portion 121 facing the first communication hole.

[0029] The second compression mechanism portion 54B has the same configuration as the first compression mechanism portion 54A. That is, the second compression mechanism portion 54B includes a second cylinder 56B, a second rolling piston 58B, and a second vane 60B.

[0030] One surface (front surface) of the second cylinder 56B is in close contact with the surface of the intermediate partition plate 52 on the side opposite to the partition wall portion 121 side. One surface (front surface) of the discharge soundproof chamber forming member 78 is in close contact with the other side surface (rear surface) of the second cylinder 56B. The second cylinder 56B has a second cylinder chamber 64B with a circular cross-section at the central portion in the radial direction.

[0031] The second rolling piston 58B is attached to the second eccentric portion 30b of the rotating shaft 30 and is located within the second cylinder chamber 64B of the second cylinder 56B. The second rolling piston 58B eccentrically rotates within the second cylinder chamber 64B of the second cylinder 56B as the rotating shaft 30 rotates. The second eccentric portion 30b is provided with a 180° phase difference around the axis of the rotating shaft 30 with respect to the first eccentric portion 30a.

[0032] The second vane 60B is biased toward the second rolling piston 58B by the second coil spring 66B. The second vane 60B abuts against the outer peripheral surface of the second rolling piston 58B, partitioning the inside of the second cylinder chamber 64B into a low-pressure chamber communicating with a second suction port (not shown) and a high-pressure chamber communicating with a second discharge port (not shown). Similar to the first suction port and the first discharge port, the second suction port and the second discharge port are provided below the rotation shaft 30 and are formed in the second cylinder 56B so as to extend radially outward from the second cylinder chamber 64B.

[0033] A second shaft hole 78a is formed in the radial center of the discharge silencing chamber forming member 78. The rear end portion of the rotation shaft 30 and its vicinity are rotatably inserted into the second shaft hole 78a. That is, the rotation shaft 30 is rotatably supported by the first shaft hole 121b formed in the partition wall portion 121 and the second shaft hole 78a formed in the discharge silencing chamber forming member 78. Therefore, the first shaft hole 121b and the second shaft hole 78a constitute a bearing portion of the rotation shaft 30.

[0034] Also, on the other surface of the discharge silencing chamber forming member 78 (the rear surface), which is opposite to the second cylinder 56B side, a second recess 78b is formed so as to surround the second shaft hole 78a. Then, the opening of the second recess 78b is closed by a disc-shaped second closing plate 80 that is in close contact with the other surface of the discharge silencing chamber forming member 78 (the surface opposite to the second cylinder 56B), thereby forming the second discharge silencing chamber 70B. That is, the internal space of the second recess 78b constitutes the second discharge silencing chamber 70B. The second discharge silencing chamber 70B communicates with the high-pressure chamber in the second cylinder chamber 64B via a second communication hole (not shown) formed in the bottom wall of the second recess 78b of the discharge silencing chamber forming member 78 and communicates with the second discharge port. Also, at a location on the bottom wall of the second recess 78b of the discharge silencing chamber forming member 78 facing the second communication hole, a second discharge valve in the form of a reed valve (not shown) is arranged in the same manner as the bottom wall of the first recess of the partition wall portion 121.

[0035] Here, the first closing plate 68, the first cylinder 56A, the intermediate partition plate 52, the second cylinder 56B, the discharge silencing chamber forming member 78, and the second closing plate 80 are fastened to the partition wall portion 121 by a plurality of fastening members (for example, through bolts) FM. In other words, the compression mechanism portion 50 (the first compression mechanism portion 54A, the second compression mechanism portion 54B) is attached and fixed to the partition wall portion 121.

[0036] The first discharge silencing chamber 70A and the second discharge silencing chamber 70B communicate with each other through a discharge communication passage (not shown) provided at a predetermined location. The discharge communication passage is formed as a passage that horizontally (front-rear direction) penetrates and extends through the bottom wall portion of the first recess constituting the first discharge silencing chamber 70A, the first cylinder 56A, the intermediate partition plate 52, the second cylinder 56B, and the bottom wall portion of the second recess 78b constituting the second discharge silencing chamber 70B. Further, the second discharge silencing chamber 70B communicates with the second accommodation chamber 20 through a communication hole (not shown) formed in the second closing plate 80.

[0037] Furthermore, the rotary compressor 1 has a refrigerant supply passage (not shown) for supplying the refrigerant (low-pressure refrigerant) in the first accommodation chamber 18 to the compression mechanism portion 50 (the first compression mechanism portion 54A, the second compression mechanism portion 54B) accommodated in the second accommodation chamber 20.

[0038] As a lubricating oil supply system, the rotary compressor 1 has a lubricating oil supply passage 82 for supplying lubricating oil to the bearing portions (the first shaft hole 121b, the second shaft hole 78a) of the rotary shaft 30 and the sliding portions of the compression mechanism portion 50 (the first compression mechanism portion 54A, the second compression mechanism portion 54B). The lubricating oil supply passage 82 includes a first oil passage 84 formed inside the second closing plate 80, a second oil passage 86 extending in the axial direction inside the rotary shaft 30, and first to fourth oil guide holes 88a to 88d extending in the radial direction inside the rotary shaft 30.

[0039] One end (lower end) of the first oil passage 84 opens at the bottom of the second closing plate 80, that is, at a portion located in the lubricating oil reservoir, and after extending upward from here, it bends toward the rear end surface of the rotary shaft 30, and the other end (upper end) is formed as a passage that opens at the surface of the second closing plate 80 on the side of the discharge silencing chamber forming member 78.

[0040] One end of the second oil passage 86 opens to the rear end surface of the rotary shaft 30 and communicates with the first oil passage 84. From here, it extends inside the rotary shaft 30 along its axis to a position beyond the first cylinder 56A, that is, to a position corresponding to the first shaft hole 121b, and the other end is formed as a closed passage.

[0041] One end of the first oil guide hole 88a opens to the second oil passage 86. From here, it extends radially outward inside the rotary shaft 30, and the other end opens to the outer peripheral surface of the rotary shaft 30 facing the second shaft hole 78a.

[0042] One end of the second oil guide hole 88b opens to the second oil passage 86. From here, it extends radially outward inside the rotary shaft 30, and the other end opens to the outer peripheral surface of the second eccentric portion 30b of the rotary shaft 30.

[0043] One end of the third oil guide hole 88c opens to the second oil passage 86. From here, it extends radially outward inside the rotary shaft 30, and the other end opens to the outer peripheral surface of the first eccentric portion 30a of the rotary shaft 30.

[0044] One end of the fourth oil guide hole 88d opens to the second oil passage 86. From here, it extends radially outward inside the rotary shaft 30, and the other end opens to the outer peripheral surface of the rotary shaft 30 facing the first shaft hole 121b.

[0045] Next, the flow of the refrigerant in the rotary compressor 1 will be described. Note that the refrigerant contains lubricating oil in a mist state.

[0046] The refrigerant (low-pressure refrigerant) on the low-pressure side of the external refrigerant circuit flows into the first accommodation chamber 18 that houses the electric motor unit 40 through the suction port 24 formed at a predetermined location on the front housing 14. That is, the first accommodation chamber 18 constitutes an "inhalation chamber" into which the low-pressure refrigerant flows from the outside. Therefore, the pressure in the first accommodation chamber 18 is substantially the same as the pressure on the low-pressure side of the external refrigerant circuit.

[0047] When power is supplied to the motor unit 40, the rotating shaft 30 rotates. As a result, in the first cylinder chamber 64A of the first compression mechanism unit 54A, the first rolling piston 58A rotates eccentrically, and in the second cylinder chamber 64B of the second compression mechanism unit 54B, the second rolling piston 58B rotates eccentrically.

[0048] The low-pressure refrigerant that has flowed into the first accommodation chamber 18 from the suction port 24 passes through the gap between the stator 42 and the rotor 44 of the motor unit 40, and thereby, the motor unit 40 is cooled by the low-pressure refrigerant. Also, the low-pressure refrigerant in the first accommodation chamber 18 is sucked into the first cylinder chamber 64A via the first suction port and is sucked into the second cylinder chamber 64B via the second suction port.

[0049] The low-pressure refrigerant sucked into the first cylinder chamber 64A is compressed in the first cylinder chamber 64A by the eccentric rotation of the first rolling piston 58A to become high-pressure refrigerant. This high-pressure refrigerant is discharged from the first cylinder chamber 64A to the first discharge silencing chamber 70A via the first discharge port and the first communication hole, and then flows into the second discharge silencing chamber 70B via the discharge communication passage.

[0050] The low-pressure refrigerant sucked into the second cylinder chamber 64B is compressed in the second cylinder chamber 64B by the eccentric rotation of the second rolling piston 58B to become high-pressure refrigerant. This high-pressure refrigerant is discharged from the second cylinder chamber 64B to the second discharge silencing chamber 70B via the second discharge port and the second communication hole.

[0051] The high-pressure refrigerant discharged from the first cylinder chamber 64A and the high-pressure refrigerant discharged from the second cylinder chamber 64B merge in the second discharge silencing chamber 70B and are then discharged to the second accommodation chamber 20 via the communication hole. That is, the second accommodation chamber 20 constitutes a "discharge chamber (high-pressure chamber)" where the high-pressure refrigerant compressed by the compression mechanism unit 50 is discharged. The pressure in the second accommodation chamber 20 is substantially the same as the pressure on the high-pressure side of the external refrigerant circuit and is higher than the pressure in the first accommodation chamber 18.

[0052] The high-pressure refrigerant discharged into the second accommodation chamber 20 contacts and / or collides with the inner surface of the housing 10 or the like, whereby the lubricating oil contained in the high-pressure refrigerant is separated. The lubricating oil separated from the high-pressure refrigerant mainly moves downward by gravity and is returned to the bottom of the second accommodation chamber 20 for storage. On the other hand, the high-pressure refrigerant from which the lubricating oil has been separated is discharged to the high-pressure side of an external refrigerant circuit through the discharge port 26.

[0053] One end of the first oil passage 84 of the lubricating oil supply passage 82 is located in the lubricating oil stored at the bottom of the second accommodation chamber 20. Further, the fourth oil guide hole 88d of the lubricating oil supply passage 82 communicates with the first accommodation chamber 18 through a minute interval formed between the outer peripheral surface of the rotating shaft 30, the small-diameter portion SD of the first shaft hole 121b, and the inner peripheral surface of the bush 22A.

[0054] Therefore, due to the pressure difference between the second accommodation chamber 20 and the first accommodation chamber 18, the lubricating oil stored at the bottom of the second accommodation chamber 20 is sucked up through the first oil passage 84 and guided to the second oil passage 86.

[0055] The lubricating oil guided to the second oil passage 86 is supplied to the second shaft hole 78a through the first oil guide hole 88a. Then, the lubricating oil supplied to the second shaft hole 78a lubricates the sliding portion between the inner peripheral surface of the second shaft hole 78a and the outer peripheral surface of the rotating shaft 30. At this time, since the outer peripheral surface of the rotating shaft 30 does not directly contact the second shaft hole 78a, wear of the discharge silencing chamber forming member 78 having the second shaft hole 78a can be suppressed.

[0056] The lubricating oil guided to the second oil passage 86 is guided to the inside of the second rolling piston 58B through the second oil guide hole 88b and supplied from there to each sliding portion of the second compression mechanism portion 54B. Similarly, the lubricating oil guided to the second oil passage 86 is guided to the inside of the first rolling piston 58A through the third oil guide hole 88c and supplied from there to each sliding portion of the first compression mechanism portion 54A.

[0057] Furthermore, the lubricating oil guided to the second oil passage 86 is supplied to the first shaft hole 121b via the fourth oil guide hole 88d. Then, the lubricating oil supplied to the first shaft hole 121b lubricates the sliding portion between the inner peripheral surface of the bush 22A and the outer peripheral surface of the rotating shaft 30 while passing through the split portion AP extending in the axial direction of the bush 22A. Since the outer peripheral surface of the rotating shaft 30 does not directly contact the first shaft hole 121b, wear of the partition wall portion 121 having the first shaft hole 121b can be suppressed. At this time, since the front end portion of the bush 22A abuts against the stepped portion SP that transitions from the large diameter portion LD to the small diameter portion SD of the first shaft hole 121b, the absolute amount of the lubricating oil discharged from the second housing chamber 20, which is the high-pressure chamber, to the first housing chamber 18, which is the low-pressure chamber, can be reduced by the pressure difference between the first housing chamber 18 and the second housing chamber 20. Therefore, the lubricating oil is held by the split portion AP of the bush 22A, whereby the lubricity of the first shaft hole 121b can be ensured and the sealing performance between the first shaft hole 121b and the rotating shaft 30 can be exhibited.

[0058] In the bush 22A, instead of the split portion AP extending in the axial direction thereof, a groove portion GP (see FIG. 7) having, for example, a V-shaped cross section or a groove portion GP (see FIG. 8) having a trapezoidal cross section that linearly extends in the axial direction from one end to the other end may be formed on the inner peripheral surface of the bush 22A. Such a groove portion functions to supply the lubricating oil to the outer peripheral surface of the rotating shaft 30. In short, it is sufficient that the bush 22A is formed with an oil passage capable of transferring the lubricating oil from one axial end to the other end.

[0059] It should be easily understood by those skilled in the art that, on the condition that the required effects can be obtained, new embodiments can be created by omitting a part, appropriately combining a part, or replacing a part with well-known techniques with respect to the technical ideas of the various above-described embodiments.

[0060] For example, the bush 22A may have self-lubricity. In this way, even if the lubricating oil for lubricating the first shaft hole 121b and the second shaft hole 78a is temporarily insufficient, these lubrications can be continuously carried out. Further, the compression mechanism portion 50 includes the first compression mechanism portion 54A and the second compression mechanism portion 54B, but it may include at least one compression mechanism.

Explanation of Reference Numerals

[0061] 1... Rotary compressor (horizontal rotary compressor), 12... Center housing (first housing, second housing), 14... Front housing (first housing), 16... Rear housing (second housing), 22A... Bush, 30... Rotating shaft, 30a... First eccentric portion (eccentric portion), 30b... Second eccentric portion (eccentric portion), 40... Electric motor portion, 50... Compression mechanism portion, 56A... First cylinder (cylinder), 56B... Second cylinder (cylinder), 58A... First rolling piston (rolling piston), 58B... Second rolling piston (rolling piston), 60A... First vane (vane), 60B... Second vane (vane), 64A... First cylinder chamber (cylinder chamber), 64B... Second cylinder chamber (cylinder chamber), 66A... First coil spring (biasing member), 66B... Second coil spring (biasing member), 121... Partition portion, 121b... First shaft hole (shaft hole), AP... Joint portion (oil passage), GP... Groove portion (oil passage), LD... Large diameter portion, SD... Small diameter portion, SP... Step portion

Claims

1. A rotating shaft arranged horizontally, a motor unit for rotating the rotating shaft, a compression mechanism unit driven by the rotating shaft, a bottomed cylindrical first housing for housing the motor unit, a bottomed cylindrical second housing for housing the compression mechanism unit, a partition wall portion disposed between the open end side of the first housing and the open end side of the second housing, and having a shaft hole through which an intermediate portion of the rotating shaft penetrates, a bush disposed between the inner peripheral surface of the shaft hole of the partition wall portion and the outer peripheral surface of the rotating shaft, and having an oil passage extending in the axial direction formed at a portion facing the outer peripheral surface of the rotating shaft, and having the shaft hole of the partition wall portion has a stepped cylindrical shape in which a portion located on the first housing side is a small diameter portion and a portion located on the second housing side is a large diameter portion, the bush is inserted from the large diameter portion side of the shaft hole until it abuts against an annular stepped portion that transitions from the large diameter portion to the small diameter portion of the shaft hole, a horizontally-mounted rotary compressor.

2. The compression mechanism unit includes a rolling piston attached to an eccentric portion of the rotating shaft, a cylinder in which a cylinder chamber in which the rolling piston eccentrically rotates is formed, a vane that contacts the outer peripheral surface of the rolling piston and partitions the cylinder chamber into a low pressure chamber and a high pressure chamber, and a biasing member that biases the vane toward the outer peripheral surface of the rolling piston. The horizontally-mounted rotary compressor according to Claim 1.

3. The oil passage is formed by a mating portion extending in the axial direction of the bush. The horizontally-mounted rotary compressor according to Claim 1.

4. The oil passage is formed by a groove portion extending in the axial direction of the bush. The horizontally-mounted rotary compressor according to Claim 1.

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