Main bearing mechanism and compressor

Abstract

The present invention discloses a main bearing mechanism and a compressor, which relate to the technical field of compressors and solve the technical problem in the prior art that the main bearing of the compressor is too high, resulting in insufficient lubrication and causing reliability problems in the operation of the compressor. The main bearing mechanism of the present invention includes a bearing assembly and an oil pool assembly, wherein the bearing assembly includes at least two main bearing sections, and at least two main bearing sections are separately arranged; the oil pool assembly includes at least two oil pools, and the number of oil pools is not less than the number of main bearings, and each main bearing section can be lubricated by the lubricating oil in at least one oil pool. The main bearing mechanism of the present invention improves the lubrication efficiency of each main bearing section by lowering the height of each main bearing section and lubricating each main bearing section in sections with the lubricating oil in the oil pool, ensuring that each main bearing section can be fully lubricated, thereby improving the reliability of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a main bearing mechanism and a compressor comprising the main bearing mechanism. Background Art

[0002] Scroll compressors are widely used in refrigeration, air conditioning, and heat pumps due to their high efficiency, compact size, light weight, and smooth operation. Generally speaking, a scroll compressor consists of a sealed casing, a fixed scroll, an orbiting scroll, a bracket, a crankshaft, an anti-rotation mechanism, an oil supply system, and a motor. Both the fixed and orbiting scrolls have spiral profiles. The orbiting scroll is eccentrically mounted 180° relative to the fixed scroll, creating multiple crescent-shaped spaces between the two scrolls. As the orbiting scroll rotates linearly around the center of the fixed scroll and within a certain radius without self-rotation, the outer crescent-shaped spaces continuously move toward the center. This pushes the refrigerant toward the center space, gradually reducing its volume and increasing its pressure until it connects to the central exhaust port, where the high-pressure refrigerant is discharged from the pump, completing the compression process.

[0003] Figure 1 FIG1 shows a partial schematic diagram of an existing scroll compressor. In order to prevent the crankshaft 7 from colliding with the upper bracket during rotation, a bearing is provided between the crankshaft 7 and the upper bracket. Figure 1 As shown, the scroll compressor has only one main bearing 1' for supporting the crankshaft 7. Therefore, the single main bearing 1' needs to be relatively high in order to limit the rotation and tilt range of the crankshaft 7. Figure 1 The existing main bearing 1' is installed in the bearing hole of the existing upper bracket 2' and is lubricated by the lubricating oil in the existing oil pool 3'. However, the applicant discovered that during compressor operation, due to the excessive height of a single existing main bearing 1', the portion away from the oil inlet was insufficiently lubricated, causing operational reliability issues for the compressor.

[0004] Therefore, there is an urgent need to improve the existing scroll compressor so that all parts of the main bearing can be fully lubricated, which has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] One of the objectives of the present invention is to provide a main bearing mechanism and compressor that address the prior art technical issues of insufficient lubrication and reduced compressor operational reliability caused by the excessive height of the compressor main bearing. The various technical benefits of the preferred technical solution of the present invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The main bearing mechanism of the present invention includes a bearing assembly and an oil pool assembly, wherein the bearing assembly includes at least two main bearing sections, and at least two of the main bearing sections are separately arranged; the oil pool assembly includes at least two oil pools, and the number of the oil pools is not less than the number of the main bearings, and each main bearing section can be lubricated by the lubricating oil in at least one of the oil pools.

[0008] According to a preferred embodiment, the bearing assembly includes a first main bearing and a second main bearing, and the oil pool assembly includes a first main bearing oil pool and a second main bearing oil pool, wherein the lubricating oil in the first main bearing oil pool is used to lubricate the first main bearing or lubricate the first main bearing and the second main bearing, and the lubricating oil in the second main bearing oil pool is used to lubricate the second main bearing.

[0009] According to a preferred embodiment, the first main bearing is installed in the bearing hole of the compressor upper bracket, the second main bearing is installed in the bearing hole of the compressor lower main bearing cover plate, and the first main bearing and the second main bearing are separated by a protrusion of the crankshaft.

[0010] According to a preferred embodiment, the first main bearing oil pool is located on the upper bracket of the compressor and is communicated with the bearing hole of the upper bracket, so that the first main bearing is lubricated by the lubricating oil in the first main bearing oil pool; the second main bearing oil pool is located in the gap formed between the lower main bearing cover plate of the compressor and the protrusion of the crankshaft, and the second main bearing oil pool is communicated with the bearing hole of the lower main bearing cover plate, so that the second main bearing is lubricated by the lubricating oil in the second main bearing oil pool.

[0011] According to a preferred embodiment, a receiving cavity is provided on the lower main bearing cover plate, the receiving cavity is located above the bearing hole of the lower main bearing cover plate, and the aperture of the receiving cavity is larger than the diameter of the protrusion, and the height of the receiving cavity is larger than the height of the protrusion.

[0012] According to a preferred embodiment, the bearing hole of the upper bracket is also connected to the bearing hole of the lower main bearing cover plate, so that the lubricating oil in the first main bearing oil pool used to lubricate the first main bearing can enter the bearing hole of the lower main bearing cover plate and lubricate the second main bearing.

[0013] According to a preferred embodiment, at least one axial through hole is provided on a side of the protrusion close to the center, and the at least one axial through hole is arranged along the circumferential direction of the protrusion, and the bearing hole of the upper bracket is connected to the bearing hole of the lower main bearing cover plate through the axial through hole.

[0014] According to a preferred embodiment, the oil pool assembly further includes a connecting portion, which is used to connect the first main bearing oil pool and the second main bearing oil pool, so that part of the lubricating oil in the first main bearing oil pool can enter the second main bearing oil pool through the connecting portion.

[0015] According to a preferred embodiment, the connecting portion includes a drainage channel, a first drainage hole and a second drainage hole, wherein the drainage channel is a vertical channel located on the upper bracket of the compressor, the first drainage hole is a vertical drainage hole located on the end surface of the lower main bearing cover plate of the compressor, and the second drainage hole is a horizontal drainage hole located on the side wall of the main bearing cover plate, and the drainage channel is used to connect the first main bearing oil pool with the first drainage hole, and the first drainage hole and the second main bearing oil pool are connected through the second drainage hole.

[0016] The compressor of the present invention includes the main bearing mechanism described in any technical solution of the present invention.

[0017] The main bearing mechanism and compressor provided by the present invention have at least the following beneficial technical effects:

[0018] The main bearing mechanism of the present invention includes a bearing assembly and an oil pool assembly, wherein the bearing assembly includes at least two main bearing sections, and at least the two main bearing sections are separately arranged. While maintaining the same limiting effect as the existing main bearing, the height of each main bearing section of the present invention is lower than that of a single existing main bearing; on the other hand, the oil pool assembly includes at least two oil pools, and the number of oil pools is not less than the number of main bearings, so that each main bearing section can be lubricated by the lubricating oil in at least one oil pool. That is, the main bearing mechanism of the present invention improves the lubrication efficiency of each main bearing section by reducing the height of each main bearing section and lubricating each main bearing section by the lubricating oil in the oil pool, ensuring that each main bearing section can be fully lubricated, thereby improving the reliability of the compressor and solving the technical problem in the prior art that the main bearing of the compressor is too high, resulting in insufficient lubrication and causing the reliability of the compressor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a partial schematic diagram of an existing scroll compressor;

[0021] Figure 2is a schematic diagram of a preferred embodiment of the compressor of the present invention;

[0022] Figure 3 yes Figure 2 A partial schematic diagram of

[0023] Figure 4 is a schematic diagram of a preferred embodiment of the lower main bearing cover plate of the present invention;

[0024] Figure 5 Schematic diagram of a preferred embodiment of the crankshaft of the present invention.

[0025] In the figure: 1', existing main bearing; 2', existing upper bracket; 3', existing oil pool; 1, static scroll; 2, upper housing; 3, guide pillar; 4, upper bracket; 5, lower housing; 6, motor; 7, crankshaft; 701, protrusion; 702, axial through hole; 8, fairing; 9, lower support ring; 10, lower cover; 11, lower bracket; 12, motor mounting bracket; 13, rotor; 14, lower main bearing cover plate; 140 1. Mounting hole; 1402. First drainage hole; 1403. Second drainage hole; 15. Eccentric sleeve; 16. Support plate; 17. Cross ring; 18. Orbiting scroll; 19. Partition plate; 20. Upper cover; 21. Connecting seat; 22. Check valve seat; 23. Sealing cover; 24. First main bearing; 25. Second main bearing; 1A. First main bearing oil pool; 2A. Drainage channel; 3A. Second main bearing oil pool. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0027] The following is attached with the instruction manual Figures 2 to 5 The main bearing mechanism and the compressor of the present invention are described in detail in Examples 1 and 2.

[0028] Example 1

[0029] This embodiment describes the main bearing mechanism of the present invention in detail.

[0030] The main bearing mechanism of this embodiment includes a bearing assembly and an oil sump assembly. The bearing assembly includes at least two main bearing segments, each of which is separately configured. The oil sump assembly includes at least two oil sumps, with the number of oil sumps being no less than the number of main bearings, and each main bearing segment can be lubricated by lubricating oil from at least one oil sump. Preferably, each main bearing segment can be lubricated by lubricating oil from a single oil sump, or from two or more oil sumps.

[0031] The main bearing mechanism of this embodiment includes a bearing assembly and an oil pool assembly, wherein the bearing assembly includes at least two main bearing sections, and at least the two main bearing sections are separately arranged. While maintaining the same limiting effect as the existing main bearing 1', the height of each main bearing section of this embodiment is lower than that of a single existing main bearing 1'; on the other hand, the oil pool assembly includes at least two oil pools, and the number of oil pools is not less than the number of main bearings, so that each main bearing section can be lubricated by the lubricating oil in at least one oil pool, that is, the main bearing mechanism of this embodiment improves the lubrication efficiency of each main bearing section by reducing the height of each main bearing section and lubricating each main bearing section by the lubricating oil in the oil pool, ensuring that each main bearing section can be fully lubricated, thereby improving the reliability of the compressor and solving the technical problem in the prior art that the main bearing of the compressor is too high, resulting in insufficient lubrication and causing the reliability of the compressor operation.

[0032] According to a preferred embodiment, the bearing assembly includes a first main bearing 24 and a second main bearing 25, and the oil pool assembly includes a first main bearing oil pool 1A and a second main bearing oil pool 3A. Figure 2 3 . The lubricating oil in the first main bearing oil pool 1A is used to lubricate the first main bearing 24 or the first main bearing 24 and the second main bearing 25, while the lubricating oil in the second main bearing oil pool 3A is used to lubricate the second main bearing 25. The preferred technical solution of this embodiment includes a bearing assembly with two main bearing sections, and the oil pool assembly includes two oil pools. The two main bearing sections are lubricated separately by the two oil pools, achieving more adequate lubrication while meeting the bearing assembly's support requirements for the crankshaft 7, thereby improving compressor reliability.

[0033] According to a preferred embodiment, the first main bearing 24 is mounted in the bearing hole of the compressor upper bracket 4, and the second main bearing 25 is mounted in the bearing hole of the compressor lower main bearing cover plate 14. The first and second main bearings 24, 25 are separated by a protrusion 701 on the crankshaft 7. Preferably, the first and second main bearings 24, 25 are cold-pressed into the bearing holes of the upper bracket 4 and the lower main bearing cover plate 14, respectively. The crankshaft 7 of this preferred technical solution preferably has a structure with smaller diameters at both ends and a larger diameter in the middle. The larger diameter portion in the middle is the protrusion 701 referred to in this preferred technical solution, which separates the first and second main bearings 24, 25.

[0034] According to a preferred embodiment, a first main bearing oil pool 1A is located on the compressor upper bracket 4 and communicates with the bearing hole of the upper bracket 4. Lubricating oil in the first main bearing oil pool 1A lubricates the first main bearing 24. A second main bearing oil pool 3A is located in the gap formed between the compressor lower main bearing cover plate 14 and the protrusion 701 of the crankshaft 7. The second main bearing oil pool 3A communicates with the bearing hole of the lower main bearing cover plate 14. Lubricating oil in the second main bearing oil pool 3A lubricates the second main bearing 25.

[0035] Preferably, a receiving cavity is provided on the lower main bearing cover plate 14, and the receiving cavity is located above the bearing hole of the lower main bearing cover plate 14, and the aperture of the receiving cavity is larger than the diameter of the protrusion 701, and the height of the receiving cavity is larger than the height of the protrusion 701, so that after the lower main bearing cover plate 14 is installed on the lower end of the upper bracket 4, a gap can be formed between the receiving cavity and the protrusion 701, such as Figures 2 to 5 Specifically, the lower main bearing cover plate 14 is provided with a plurality of mounting holes 1401 in the circumferential direction. The lower main bearing cover plate 14 is fixed to the lower end of the upper bracket 4 by screws installed in the mounting holes 1401. The gap between the lower main bearing cover plate 14 and the protrusion 701 forms a second main bearing oil pool 3A. The lubricating oil in the second main bearing oil pool 3A can lubricate the second main bearing 25. Figures 2 to 5 shown.

[0036] According to a preferred embodiment, the bearing hole of the upper bracket 4 is also connected to the bearing hole of the lower main bearing cover plate 14, so that the lubricating oil in the first main bearing oil pool 1A, after being used to lubricate the first main bearing 24, can enter the bearing hole of the lower main bearing cover plate 14 and lubricate the second main bearing 25. Preferably, at least one axial through hole 702 is provided on one side of the protrusion 701 near the center. The at least one axial through hole 702 is arranged along the circumferential direction of the protrusion 701, and the bearing hole of the upper bracket 4 is connected to the bearing hole of the lower main bearing cover plate 14 through the axial through hole 702, as shown in FIG. Figure 2 or Figure 3 or Figure 5As shown. The preferred technical solution of this embodiment provides an axial through-hole 702 near the center of the protrusion 701. This allows the lubricating oil in the first main bearing oil pool 1A, which is used to lubricate the first main bearing 24, to enter the bearing hole of the lower main bearing cover plate 14 through the axial through-hole 702 to lubricate the second main bearing 25. In other words, this preferred technical solution utilizes not only the lubricating oil in the second main bearing oil pool 3A but also the lubricating oil in the first main bearing oil pool 1A used to lubricate the first main bearing 24, ensuring that the second main bearing 25 receives adequate lubrication.

[0037] According to a preferred embodiment, the oil pool assembly further includes a connecting portion for connecting the first main bearing oil pool 1A and the second main bearing oil pool 3A, so that part of the lubricating oil in the first main bearing oil pool 1A can enter the second main bearing oil pool 3A through the connecting portion. Preferably, the connecting portion includes a drainage channel 2A, a first drainage hole 1402 and a second drainage hole 1403. Figures 2-4 As shown. The drainage channel 2A is a vertical channel located on the compressor upper bracket 4, the first drainage hole 1402 is a vertical drainage hole located on the end surface of the compressor lower main bearing cover plate 14, and the second drainage hole 1403 is a horizontal drainage hole located on the side wall of the lower main bearing cover plate 14. The drainage channel 2A is used to connect the first main bearing oil pool 1A with the first drainage hole 1402, and the first drainage hole 1402 is connected to the second main bearing oil pool 3A through the second drainage hole 1403. Figure 2 As shown in FIG3 , the second drainage hole 1403 is formed toward one side of the receiving cavity and does not penetrate the sidewall of the lower main bearing cover plate 14, thereby preventing lubricating oil leakage. The oil sump assembly of the preferred technical solution of this embodiment also includes a connecting portion, which allows some of the lubricating oil in the first main bearing oil sump 1A to flow sequentially through the drainage channel 2A, the first drainage hole 1402, and the second drainage hole 1403 into the second main bearing oil sump 3A.

[0038] In the preferred technical solution of this embodiment, part of the lubricating oil in the first main bearing oil pool 1A is used to lubricate the first main bearing 24 and then lubricate the second main bearing 25, and the other part enters the second main bearing oil pool 3A through the connecting portion and lubricates the second main bearing 25. This not only improves the utilization rate of the lubricating oil, but also improves the lubrication effect of each section of the main bearing.

[0039] As can be seen, the number of main bearing segments included in the bearing assembly of the preferred technical solution of this embodiment is not limited to two, and the number of oil pools included in the oil sump assembly is not limited to two. By increasing the number of lower main bearing cover plates 14 and the number of protrusions 701 on the crankshaft 7 in accordance with the method described in the above technical solution, the main bearing mechanism of this embodiment can also be provided with three or more main bearing segments and three or more oil pools.

[0040] Example 2

[0041] The compressor of this embodiment includes the main bearing mechanism of any technical solution in Example 1. Preferably, the compressor of this embodiment is a scroll compressor. More preferably, the compressor of this embodiment is a scroll compressor for air conditioners or heat pumps.

[0042] The remaining components of the scroll compressor are the same as those of the existing scroll compressor. Figure 2 As shown, the scroll compressor of this embodiment mainly consists of a motor 6, an upper bracket 4, a lower bracket 11, a fixed scroll 1, a movable scroll 18, a cross ring 17, a crankshaft 7, etc. The movable scroll 18 and the fixed scroll 1 are mounted on the upper bracket 4 with a phase angle difference of 180 degrees. The movable scroll 18 moves under the drive of the crankshaft 7 and meshes with the fixed scroll 1 to form a series of crescent-shaped closed cavities that are isolated from each other and have continuously changing volumes. When the compressor is running, the motor 6 drives the crankshaft 7 to rotate. The crank section of the crankshaft 7 is installed with an eccentric sleeve 15 with radial flexibility. The eccentric sleeve 15 drives the movable scroll 18 to move. Under the anti-rotation restriction of the cross ring 17, the movable scroll 18 performs a translational motion around the center of the crankshaft 7 with a fixed radius. The refrigerant entering from the suction pipe is sucked into the crescent-shaped suction chamber formed by the movable scroll 18 and the fixed scroll 1. After compression, it enters the high-pressure chamber formed by the upper cover 20 and the partition plate 19 through the exhaust hole of the fixed scroll 1 and the check valve seat 22, and is then discharged through the exhaust pipe.

[0043] See again Figure 2 The scroll compressor also includes an upper shell 2, a lower shell 5, an upper cover 20, and a lower cover 10, which form a sealed container. The motor 6 includes a rotor 13 sleeved on the outside of the crankshaft 7 and a stator disposed outside the rotor 13. The motor 6 is fixed to the motor mounting bracket 12, and a fairing 8 is disposed outside the motor 6. The scroll compressor also includes a guide post 3, a lower support ring 9, a support plate 16, a connecting seat 21, and a sealing cover 23.

[0044] The compressor of this embodiment includes a main bearing mechanism of any technical solution in Example 1. Through the function of the main bearing mechanism, not only the lubrication efficiency of each main bearing section can be improved, but also each main bearing section can be fully lubricated, thereby improving the reliability of the compressor and solving the technical problem in the prior art that the main bearing of the compressor is too high, resulting in insufficient lubrication and causing the reliability of the compressor operation.

[0045] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A main bearing mechanism, characterized in that: The invention comprises a bearing assembly and an oil pool assembly, wherein the bearing assembly comprises at least two main bearing sections, and at least the two main bearing sections are separately arranged; the oil pool assembly comprises at least two oil pools, and the number of the oil pools is not less than the number of the main bearings, and each main bearing section can be lubricated by the lubricating oil in at least one of the oil pools; The bearing assembly comprises a first main bearing (24) and a second main bearing (25), and the oil pool assembly comprises a first main bearing oil pool (1A) and a second main bearing oil pool (3A), wherein: The lubricating oil in the first main bearing oil pool (1A) is used to lubricate the first main bearing (24) or to lubricate the first main bearing (24) and the second main bearing (25), and the lubricating oil in the second main bearing oil pool (3A) is used to lubricate the second main bearing (25); The first main bearing oil pool (1A) is located on the compressor upper bracket (4) and is in communication with the bearing hole of the upper bracket (4) so ​​as to lubricate the first main bearing (24) with the lubricating oil in the first main bearing oil pool (1A); The second main bearing oil pool (3A) is located in a gap formed between the lower main bearing cover plate (14) of the compressor and the protruding portion (701) of the crankshaft (7), and the second main bearing oil pool (3A) is communicated with the bearing hole of the lower main bearing cover plate (14) so ​​as to lubricate the second main bearing (25) with lubricating oil in the second main bearing oil pool (3A).

2. The main bearing mechanism according to claim 1, characterized in that: The first main bearing (24) is installed in a bearing hole of an upper bracket (4) of the compressor, and the second main bearing (25) is installed in a bearing hole of a lower main bearing cover plate (14) of the compressor, and the first main bearing (24) and the second main bearing (25) are separated by a protrusion (701) of a crankshaft (7).

3. The main bearing mechanism according to claim 1, characterized in that: The lower main bearing cover plate (14) is provided with an accommodating cavity, the accommodating cavity is located above the bearing hole of the lower main bearing cover plate (14), the aperture of the accommodating cavity is larger than the diameter of the protrusion (701), and the height of the accommodating cavity is larger than the height of the protrusion (701).

4. The main bearing mechanism according to claim 1, characterized in that: The bearing hole of the upper bracket (4) is also connected to the bearing hole of the lower main bearing cover plate (14), so that the lubricating oil in the first main bearing oil pool (1A) used to lubricate the first main bearing (24) can enter the bearing hole of the lower main bearing cover plate (14) and lubricate the second main bearing (25).

5. The main bearing mechanism according to claim 4, characterized in that: At least one axial through hole (702) is provided on one side of the protruding portion (701) close to the center. The at least one axial through hole (702) is provided along the circumferential direction of the protruding portion (701), and enables the bearing hole of the upper bracket (4) to communicate with the bearing hole of the lower main bearing cover plate (14) through the axial through hole (702).

6. The main bearing mechanism according to claim 1, characterized in that: The oil pool assembly further comprises a connecting portion, which is used to connect the first main bearing oil pool (1A) and the second main bearing oil pool (3A), so that part of the lubricating oil in the first main bearing oil pool (1A) can enter the second main bearing oil pool (3A) through the connecting portion.

7. The main bearing mechanism according to claim 6, characterized in that: The connecting portion includes a drainage channel (2A), a first drainage hole (1402) and a second drainage hole (1403), wherein: The drainage channel (2A) is a vertical channel located on the compressor upper bracket (4), the first drainage hole (1402) is a vertical drainage hole located on the end surface of the compressor lower main bearing cover plate (14), and the second drainage hole (1403) is a horizontal drainage hole located on the side wall of the main bearing cover plate (14), and The drainage channel (2A) is used to connect the first main bearing oil pool (1A) with the first drainage hole (1402), and the first drainage hole (1402) and the second main bearing oil pool (3A) are connected through the second drainage hole (1403).

8. A compressor, characterized in that: Comprising the main bearing mechanism according to any one of claims 1 to 7.

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