Bearing assembly, pump body assembly and scroll compressor

Abstract

The application provides a bearing assembly, a pump body assembly and a scroll compressor. The bearing assembly comprises a bearing, a crankshaft and an oil reservoir, the bearing is arranged in the oil reservoir and used for supporting the crankshaft; the crankshaft is provided with a central oil hole and a radial oil hole, one end of the radial oil hole is communicated with the central oil hole, and the other end of the radial oil hole is communicated with the oil reservoir; when the crankshaft rotates, the central oil hole absorbs oil and sends the oil to the oil reservoir through the radial oil hole. The bearing supporting the crankshaft is arranged in the oil reservoir, and the lubricating oil is transported to the oil reservoir from the central oil hole of the crankshaft, so that the bearing can be in the lubricating oil no matter when the scroll compressor is started for the first time or when frequent start-stop occurs during operation, and the state of little oil or even no oil is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of scroll compressors, and particularly relates to a bearing assembly, a pump body assembly and a scroll compressor. BACKGROUND

[0002] The scroll compressor is composed of a closed shell, a static scroll disc, a dynamic scroll disc, a support, an eccentric crankshaft, an anti-rotation mechanism and an electric mechanism. The profile lines of the dynamic and static scroll discs are spiral, the dynamic scroll disc is installed eccentrically relative to the static scroll disc and with a difference of 180 degrees, and a plurality of crescent spaces are formed between the dynamic and static scroll discs. The dynamic scroll disc rotates around the center of the static scroll disc as a rotation center and performs a non-self-rotation translational motion with a certain rotation eccentric radius, and the outer circle crescent space constantly moves to the center. At this time, the refrigerant is gradually pushed to the center space, the volume of which is constantly reduced and the pressure is constantly increased, until the center exhaust hole is communicated, and the high-pressure refrigerant is discharged from the pump body, completing the compression process.

[0003] As a rotary machine, the bearing of the scroll compressor plays a role in transmission and load support, and the reliability of the bearing directly determines the application effect and service life of the compressor. When the scroll compressor is frequently started and stopped during the first start or operation, the bearing is usually in a state of little oil or even lack of oil, and at this time, the compressor bearing is prone to damage. SUMMARY

[0004] Therefore, the application provides a bearing assembly, a pump body assembly and a scroll compressor, which can solve the problem that the bearing of the scroll compressor is usually in a state of little oil or even lack of oil when the scroll compressor is frequently started and stopped during the first start or operation, and at this time, the compressor bearing is prone to damage.

[0005] In order to solve the above problems, the application provides a bearing assembly, which comprises:

[0006] A bearing, a crankshaft and an oil storage groove, the bearing is arranged in the oil storage groove and used for supporting the crankshaft;

[0007] The crankshaft is provided with a central oil hole and a radial oil hole, one end of the radial oil hole is communicated with the central oil hole, and the other end is communicated with the oil storage groove; when the crankshaft rotates, the central oil hole absorbs oil and sends the oil to the oil storage groove through the radial oil hole.

[0008] Optionally, the crankshaft is vertically arranged, and the crankshaft is further provided with an axial oil hole, one end of the axial oil hole is communicated with the other end of the radial oil hole, and the other end of the axial oil hole is communicated with the bottom of the oil storage groove.

[0009] Optionally, the other end of the axial oil hole is provided with a radial oil outlet, so that the axial oil hole is communicated with the oil storage groove.

[0010] Optionally, the oil storage groove is formed by extending from the bottom of the mounting member to the crankshaft and then extending axially along the crankshaft.

[0011] Optionally, the axial recess has a depth less than the axial height of the bearing.

[0012] Optionally, a sealing member is arranged in the axial recess to seal the axial recess and the axial extension of the mounting member.

[0013] Optionally, a thrust bearing is arranged on the bottom surface of the annular groove between the bottom surface of the journal and the inner bottom surface of the annular groove.

[0014] According to another aspect of the present application, a pump body assembly is provided, which comprises the bearing assembly as described above.

[0015] Optionally, the pump body assembly further comprises an upper support, the bearing is arranged between the upper support and the crankshaft, and the oil storage groove is arranged on the upper support.

[0016] According to still another aspect of the present application, a scroll compressor is provided, which comprises the bearing assembly as described above or the pump body assembly as described above.

[0017] The bearing assembly provided by the present application comprises a bearing, a crankshaft and an oil storage groove, the bearing is arranged in the oil storage groove to support the crankshaft, the crankshaft is provided with a central oil hole and a radial oil hole, one end of the radial oil hole is communicated with the central oil hole, and the other end of the radial oil hole is communicated with the oil storage groove, and when the crankshaft rotates, the central oil hole absorbs oil which is then sent to the oil storage groove through the radial oil hole.

[0018] The bearing supporting the crankshaft is arranged in the oil storage groove, and the lubricating oil is delivered from the central oil hole of the crankshaft to the oil storage groove, so that the bearing can be in the lubricating oil no matter when the scroll compressor is started for the first time or when frequent start-stop occurs during operation, and the state of insufficient oil or even no oil can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present application;

[0020] Figure 2 FIG. 5 is a structural schematic view of an upper support according to an embodiment of the present application;

[0021] Figure 3 FIG. 7 is a sectional view of a crankshaft according to an embodiment of the present application;

[0022] Figure 4 FIG. 8 is a three-dimensional structural schematic view of a crankshaft according to an embodiment of the present application.

[0023] Figure 5 Figure 1 is a schematic view of an oil circulation of a scroll compressor according to an embodiment of the present application.

[0024] Reference signs are indicated as follows:

[0025] 1. scroll compressor; 2. compression mechanism; 3. driving part; 4. motor; 5. static scroll plate; 6. dynamic scroll plate; 7. cross slip ring; 8. upper bracket; 8a. upper bracket oil storage blocking ring; 8b. upper bracket bearing mounting hole; 8c. sealing ring mounting groove; 8d. upper bracket oil return hole; 9. upper cover; 10. housing; 11. crankshaft; 11a. crankshaft groove; 11b. crankshaft journal outer diameter; 11c. crankshaft radial oil passage; 11d. crankshaft downward oil passage; 11e. crankshaft center oil hole; 11f. crankshaft groove top oil outlet; 111. crankshaft eccentric portion cutting edge; 112. crankshaft journal portion cutting edge; 12. dynamic plate sliding bearing; 13. sealing element; 14. main sliding bearing; 15. thrust bearing; 16. main balance weight; 17. motor rotor; 18. motor stator; 19. secondary balance weight; 20. secondary bearing cover plate; 21. lower bracket; 22. secondary bearing; 23. oil return pipe; 24. oil supply mechanism; 25. lower cover; 26. lower cover oil pool. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present application clearer, the following will be combined with the embodiments of the present application and corresponding drawings to make a clear and complete description of the technical solutions of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units need not be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] Reference should be made to Figures 1 to 5 As shown, according to an embodiment of the present application, a bearing assembly comprises:

[0029] A bearing is arranged in the oil reservoir for supporting the crankshaft 11;

[0030] The crankshaft 11 is provided with a central oil hole and a radial oil hole, one end of the radial oil hole is communicated with the central oil hole, and the other end is communicated with the oil reservoir; when the crankshaft 11 rotates, the central oil hole absorbs oil and sends it to the oil reservoir through the radial oil hole.

[0031] The bearing supporting the crankshaft 11 is arranged in the oil reservoir, and the lubricating oil is transported from the central oil hole of the crankshaft 11 to the oil reservoir, so that the bearing can be in the lubricating oil no matter when the scroll compressor 1 is started for the first time or when frequent start-stop occurs during operation, and the oil shortage or even oil shortage state is avoided.

[0032] In some embodiments, the crankshaft 11 is vertically arranged, and the crankshaft 11 is further provided with an axial oil hole, one end of the axial oil hole is communicated with the other end of the radial oil hole, and the other end is communicated with the bottom of the oil reservoir. Preferably, the other end of the axial oil hole is provided with a radial oil outlet, so that the axial oil hole is communicated with the oil reservoir.

[0033] Through the central oil hole, the radial oil hole and the axial oil hole, the lubricating oil is sent to the bottom of the oil reservoir, ensuring that the lubricating oil can be smoothly sent to the oil reservoir, thereby ensuring that the bearing is lubricated at all times.

[0034] In some embodiments, the oil reservoir is formed by extending the bottom of the mounting part assembling the bearing to the crankshaft 11 and then extending along the axial direction of the crankshaft 11 to form an annular groove; the crankshaft 11 is provided with a journal at the bearing support, and the journal is provided with an axial groove for accommodating the axial extension of the mounting part.

[0035] The specific structure of the oil reservoir can use the mounting part assembling the bearing, such as the upper support 8 in the conventional scroll compressor 1, which is usually provided with a groove with an axial hole for penetrating the crankshaft 11, and the bearing is arranged in the groove; the bottom of the groove is axially extended to form an annular groove-shaped oil reservoir based on the vertical arrangement of the crankshaft 11, and the oil reservoir can store lubricating oil; and since the bottom of the groove is axially extended, an axial groove is arranged on the journal of the crankshaft 11, which is convenient for matching and extending.

[0036] In some embodiments, the depth of the axial groove is less than the axial height of the bearing.

[0037] Based on the fact that the bearing sleeve is arranged on the outer periphery of the journal of the crankshaft 11, the central oil hole, the radial oil hole and the axial oil hole are arranged in the oil reservoir, so that the depth of the axial groove on the journal is less than the axial height of the bearing; in actual production, the difference between the two can be reduced, which can improve the oil storage capacity of the oil reservoir.

[0038] In some embodiments, a sealing member 13 is arranged in the axial recess, for sealing the axial recess and the axial extension of the mounting member.

[0039] Since the axial recess is not deep enough, in order to avoid the lubricating oil in the oil reservoir flowing out of the gap between the axial recess and the axial extension, a sealing member 13 is arranged here, so that the lubricating oil can only flow through the bearing and circulate lubrication of the bearing. In specific arrangement, a mounting groove can be arranged at the top end of the axial extension, and a sealing member 13 such as a sealing ring is assembled.

[0040] In some embodiments, a thrust bearing 15 is arranged on the bottom surface of the ring groove, between the bottom surface of the journal and the inner bottom surface of the ring groove.

[0041] Since the crankshaft 11 is vertically arranged, a part of the journal is in the oil reservoir, in order to reduce the wear between the bottom surface of the journal and the oil reservoir, a thrust bearing 15 is arranged therebetween. And this thrust bearing 15 is also in the oil reservoir, so as to obtain good lubrication effect.

[0042] According to another aspect of the present application, a pump body assembly is provided, comprising the bearing assembly as described above.

[0043] In some embodiments, the pump body assembly further comprises an upper support 8, and the bearing is arranged between the upper support 8 and the crankshaft 11; and the oil reservoir is arranged on the upper support 8.

[0044] The oil reservoir is arranged on the upper support 8, and the journal of the crankshaft 11 is partially modified, the whole structure is slightly modified, and no other parts are added, which is high in operability.

[0045] According to still another aspect of the present application, a scroll compressor 1 is provided, comprising the bearing assembly as described above or the pump body assembly as described above.

[0046] As Figure 1The cross-sectional structure of the entire scroll compressor 1 is shown, which contains a compression mechanism 2 and a driving part 3 in a sealed container, which is composed of a closed container upper cover 9, a closed container shell 10 and a closed container lower cover 25. The compression mechanism 2 is composed of a static scroll disc 5, a dynamic scroll disc 6 and a cross slip ring 7. The driving part 3 is mainly composed of a motor 4 and a crankshaft 13. During the operation of the scroll compressor, the dynamic scroll disc 6 is driven by the driving part 3 to rotate and mesh with the static scroll disc 5 to form a crescent-shaped compression chamber. With the rotation of the crankshaft 11, the refrigerant enters the compression mechanism 2, the dynamic scroll disc 6 continues to rotate and translate, and always maintains a good meshing state, the suction chamber continuously moves towards the center, the volume continuously decreases, and the pressure in the chamber continuously rises. When the compression reaches the predetermined compression ratio, the refrigerant is discharged from the center exhaust port of the static scroll disc 5, enters the space of the sealed container upper cover, passes through the exhaust passage of the static scroll disc 5 and the upper support 8, enters the space of the motor 4, cools the motor 4, and then is discharged out of the compressor 1 to enter the air conditioning system to complete the refrigeration / heating cycle.

[0047] As shown in Figure 2 , the present application makes partial structural modification to the upper support 8, and the core feature is that an oil storage baffle 8a is arranged on the bearing mounting portion of the upper support 8, that is, the bottom of the bearing mounting portion extends axially upward to form an axially extending section; the height of the baffle is equal to the lower edge of the upper support bearing 14, which can store part of the lubricating oil. Preferably, the oil storage baffle is a circular ring structure. Under the premise of meeting the space requirement and strength requirement, the height of the oil storage baffle is as close to the height of the bearing as possible to obtain the maximum oil storage height. A sealing element mounting groove 8c is arranged at the top end of the oil storage baffle 8a, and an oil return channel 8d is arranged to cooperate with the oil return pipe 23 to realize the oil return function.

[0048] As shown in Figure 3 and 4 , a groove 11a is arranged at the journal of the crankshaft 11 of the present application, and the upper support oil storage baffle 8a is embedded in the groove 11a, and a cooperation space with clearance is formed between the two. An axial oil hole 11d, a radial oil hole 11c and a central oil hole 11 are communicated, and an oil outlet 11f is arranged at the top of the crankshaft groove.

[0049] As shown in Figure 5 , the oil circuit diagram shows that the upper support bearing, as a large force bearing of the compressor, needs to ensure effective lubrication. The upper support bearing is mounted in the upper support bearing seat hole, and the inner diameter of the bearing cooperates with the outer diameter 11b of the crankshaft journal with a gap. Preferably, a sealing groove 8c is arranged at the upper end of the baffle 8a, and a sealing element 13 is arranged. The sealing element 13 cooperates with the bottom of the crankshaft groove to form a seal to prevent lubricating oil from leaking. The above structure cooperates to form an oil storage space, which can ensure that the bearing of the support is always immersed in lubricating oil to ensure the lubrication of the bearing.

[0050] As a vertical scroll compressor, the shaft assembly contains crankshaft, motor rotor assembly and balance block and other components, heavy and need to rotate at high speed, so the shaft bearing structure needs to be set. The shaft of the application is in contact with the thrust bearing 15 on the upper end of the crankshaft groove, which is in the oil tank of the application, and the lubrication is reliable.

[0051] The oil circulation is as follows: after the oil pump 24 starts working, the lubricating oil in the lower cover oil pool 26 is delivered to the upper bracket through the central oil hole. The radial oil hole 11c is communicated with the central main oil hole in the crankshaft main journal. The lubricating oil flows out from the oil storage hole 11 at the top of the crankshaft groove through the downward oil path, and is supplied to the thrust bearing 15 for lubrication. Then it flows to the crankshaft cutting edge 112, and the upper bracket bearing 14 is lubricated. Finally, the lubricating oil is collected in the upper bracket oil collection space S, and finally returns to the lower cover oil pool 26 through the oil return pipe 23, thereby forming the oil circulation and bearing lubrication system.

[0052] The above is a specific typical embodiment of the application, which briefly expresses the core idea of the application. Through the oil circulation structure of the application, the lubrication effect when the scroll compressor runs at high speed or restarts is achieved, and the invention can effectively take away the friction heat of the friction pair to prevent the wear failure of the compressor during high-speed rotation, improve the reliability and compressor performance.

[0053] It is easy for those skilled in the art to understand that the above-mentioned embodiments can be freely combined and superimposed without conflict.

[0054] The above is only a preferred embodiment of the application, and does not limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application. The above is only a preferred embodiment of the application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the application, a number of improvements and modifications can be made, which should be regarded as the protection scope of the application.

Claims

1. A bearing assembly, characterized in that: include: A bearing, a crankshaft (11) and an oil storage tank, wherein the bearing is arranged in the oil storage tank and is used to support the crankshaft (11); The crankshaft (11) is provided with a central oil hole and radial oil holes, one end of the radial oil hole is connected to the central oil hole, and the other end is connected to the oil storage tank; when the crankshaft (11) rotates, the central oil hole absorbs oil and sends it to the oil storage tank through the radial oil holes; The crankshaft (11) is vertically arranged; the oil storage tank extends from the bottom of the mounting member assembled with the bearing toward the crankshaft (11), and then extends upward along the axis of the crankshaft (11) to form an annular groove; the crankshaft (11) is configured as a journal at the bearing support, and the journal is provided with an axial groove for accommodating the axial extension section of the mounting member.

2. The bearing assembly according to claim 1, wherein: The crankshaft (11) is also provided with an axial oil hole, one end of which is communicated with the other end of the radial oil hole, and the other end of which is led into the bottom of the oil storage tank.

3. The bearing assembly according to claim 2, wherein: A radial oil outlet hole is provided at the other end of the axial oil hole, so that the axial oil hole is connected to the oil storage tank.

4. The bearing assembly according to claim 1, wherein: The depth of the axial groove is smaller than the axial height of the bearing.

5. The bearing assembly according to claim 1, wherein: A sealing member (13) is provided in the axial groove for sealing the axial groove and the axial extension section of the mounting member.

6. The bearing assembly according to claim 5, wherein: A thrust bearing (15) is provided on the bottom surface of the annular groove, and the thrust bearing (15) is arranged between the bottom surface of the journal and the inner bottom surface of the annular groove.

7. A pump assembly, characterized in that: Comprising the bearing assembly according to any one of claims 1-6.

8. The pump assembly according to claim 7, characterized in that The pump body assembly further comprises an upper bracket (8), the bearing being arranged between the upper bracket (8) and the crankshaft (11); and the oil storage tank being arranged on the upper bracket (8).

9. A scroll compressor (1), characterized in that: It comprises the bearing assembly according to any one of claims 1 to 6 or the pump body assembly according to claim 8.

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