阅读说明：本技术 一种主轴承机构和压缩机 (Main bearing mechanism and compressor ) 是由 魏会军 罗鸿智 李海港 于 2020-12-03 设计创作，主要内容包括：本发明公开了一种主轴承机构和压缩机,涉及压缩机技术领域,解决了现有技术中压缩机主轴承高度过高导致其润滑不充分,引发压缩机运行可靠性的技术问题。本发明的主轴承机构包括轴承组件和油池组件,其中,轴承组件包括至少两段主轴承,并且至少两段主轴承为分体设置；油池组件包括至少两个油池,并且油池的数量不少于主轴承的数量,并使每段主轴承能够通过至少一个油池中的润滑油进行润滑。本发明的主轴承机构,通过降低每段主轴承的高度以及通过油池中的润滑油对每段主轴承进行分段润滑,提高每段主轴承的润滑效率,保证每段主轴承均可以得到充分润滑,从而可以提高压缩机的可靠性。(The invention discloses a main bearing mechanism and a compressor, relates to the technical field of compressors, and solves the technical problem that the compressor operation reliability is caused by insufficient lubrication due to overhigh main bearing height in the prior art. The main bearing mechanism comprises a bearing assembly and an oil pool assembly, wherein the bearing assembly comprises at least two sections of main bearings, and the at least two sections of main bearings are arranged in a split manner; the oil pool assembly comprises at least two oil pools, the number of the oil pools is not less than that of the main bearings, and each main bearing can be lubricated by lubricating oil in at least one oil pool. According to the main bearing mechanism, the height of each section of main bearing is reduced, and each section of main bearing is lubricated in a segmented mode through lubricating oil in the oil pool, so that the lubricating efficiency of each section of main bearing is improved, each section of main bearing can be fully lubricated, and the reliability of a compressor can be improved.)

1. The main bearing mechanism is characterized by comprising a bearing assembly and an oil pool assembly, wherein the bearing assembly comprises at least two sections of main bearings, and the at least two sections of main bearings are arranged in a split manner; the oil pool assembly comprises at least two oil pools, the number of the oil pools is not less than that of the main bearings, and each section of the main bearing can be lubricated by lubricating oil in at least one oil pool.

2. The main bearing mechanism of claim 1 wherein the bearing assembly comprises a first main bearing (24) and a second main bearing (25), 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 for lubricating the first main bearing (24) or lubricating 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 for lubricating the second main bearing (25).

3. The main bearing mechanism of claim 2 wherein the first main bearing (24) is mounted in a bearing bore of a compressor upper bracket (4), the second main bearing (25) is mounted in a bearing bore of a compressor lower main bearing cap plate (14), and the first main bearing (24) and the second main bearing (25) are separated by a bulge (701) of the crankshaft (7).

4. The main bearing mechanism of claim 2 wherein the first main bearing oil pool (1A) is located on a compressor upper bracket (4) and communicates with a bearing bore of the upper bracket (4) to lubricate the first main bearing (24) with lubrication oil in the first main bearing oil pool (1A);

the second main bearing oil pool (3A) is located in a gap formed between a lower main bearing cover plate (14) of the compressor and a bulge (701) of a crankshaft (7), and the second main bearing oil pool (3A) is communicated with a bearing hole of the lower main bearing cover plate (14) so as to lubricate the second main bearing (25) through lubricating oil in the second main bearing oil pool (3A).

5. The main bearing mechanism of claim 4 wherein the lower main bearing cap (14) is provided with a receiving cavity above the bearing bore of the lower main bearing cap (14) and wherein the bore diameter of the receiving cavity is greater than the diameter of the protrusion (701) and the height of the receiving cavity is greater than the height of the protrusion (701).

6. The main bearing mechanism of claim 4 wherein the bearing bore of the upper housing (4) is further in communication with the bearing bore of the lower main bearing cap plate (14) to allow lubrication oil in the first main bearing oil pool (1A) used to lubricate the first main bearing (24) to enter the bearing bore of the lower main bearing cap plate (14) and lubricate the second main bearing (25).

7. The main bearing mechanism of claim 6 wherein the protrusion (701) is provided with at least one axial through hole (702) on a side thereof near the center, the at least one axial through hole (702) being provided in a circumferential direction of the protrusion (701) and communicating the bearing bore of the upper bracket (4) with the bearing bore of the lower main bearing cap plate (14) through the axial through hole (702).

8. The main bearing mechanism of claim 2 wherein the oil sump assembly further comprises a communication for communicating the first main bearing oil sump (1A) and the second main bearing oil sump (3A) such that a portion of the lubrication oil in the first main bearing oil sump (1A) can pass through the communication into the second main bearing oil sump (3A).

9. The main bearing mechanism of claim 8 wherein the communication portion comprises 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 an upper bracket (4) of the compressor, the first drainage holes (1402) are vertical drainage holes located on the end face of a main bearing cover plate (14) under the compressor, the second drainage holes (1403) are transverse drainage holes located on the side wall of the main bearing cover plate (14), and

the drainage channel (2A) is used for communicating 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 communicated through the second drainage hole (1403).

10. A compressor comprising a main bearing mechanism as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of compressors, in particular to a main bearing mechanism and a compressor comprising the same.

Background

Scroll compressors are widely used in the fields of refrigeration air conditioners, heat pumps and the like due to the characteristics of high efficiency, small size, light weight, stable operation and the like. Generally, a scroll compressor includes a hermetic casing, a fixed scroll, a movable scroll, a bracket, a crankshaft, an anti-rotation mechanism, an oil supply device, and a motor. The molded lines of the fixed scroll and the movable scroll are both spiral, the movable scroll is eccentric relative to the fixed scroll and is installed with a 180-degree difference, and therefore a plurality of crescent-shaped spaces are formed between the movable scroll and the fixed scroll. When the movable scroll plate does non-autorotation rotary translation with the center of the fixed scroll plate as a rotation center and a certain rotation radius, the outer ring crescent space continuously moves towards the center, at the moment, the refrigerant is gradually pushed to the center space, the volume of the refrigerant is continuously reduced, the pressure of the refrigerant is continuously increased until the refrigerant is communicated with the central exhaust hole, and the high-pressure refrigerant is discharged out of the pump body, so that the compression process is completed.

FIG. 1 shows a partial schematic view of a prior art 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 for this purpose. As shown in fig. 1, the scroll compressor has only one existing main bearing 1 'for supporting the crankshaft 7, and for this reason, the single existing main bearing 1' needs a high height to complete the limitation of the rotation inclination range of the crankshaft 7. Referring again to fig. 1, the existing main bearing 1 'is mounted in a bearing bore of the existing upper bracket 2', and the existing main bearing 1 'is lubricated by lubricating oil in the existing oil sump 3'. However, the applicant has found that during operation of the compressor, the individual existing main bearings 1' are at too high a level, which results in insufficient lubrication of the parts thereof remote from the oil inlet, and thus causes problems in the operational reliability of the compressor.

Therefore, it is a urgent need to improve the existing scroll compressor so that all parts of the main bearing can be fully lubricated, and the technical problem to be solved by those skilled in the art is urgent.

Disclosure of Invention

One of the purposes of the invention is to provide a main bearing mechanism and a compressor, which solve the technical problems of insufficient lubrication and compressor operation reliability caused by overhigh main bearing height of the compressor in the prior art. The various technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.

In order to achieve the purpose, the invention provides the following technical scheme:

the main bearing mechanism comprises a bearing assembly and an oil pool assembly, wherein the bearing assembly comprises at least two sections of main bearings, and the at least two sections of main bearings are arranged in a split manner; the oil pool assembly comprises at least two oil pools, the number of the oil pools is not less than that of the main bearings, and each section of the main bearing can be lubricated by lubricating oil in at least one oil pool.

According to a preferred embodiment, the bearing assembly comprises a first main bearing and a second main bearing, and the oil pool assembly comprises 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 for lubricating the first main bearing or lubricating the first main bearing and the second main bearing, and the lubricating oil in the second main bearing oil pool is used for lubricating the second main bearing.

According to a preferred embodiment, the first main bearing is mounted in a bearing bore of an upper bracket of the compressor, the second main bearing is mounted in a bearing bore of a lower main bearing cover plate of the compressor, and the first main bearing and the second main bearing are separated by a bulge of the crankshaft.

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 as to lubricate the first main bearing through lubricating oil in the first main bearing oil pool; the second main bearing oil pool is positioned in a gap formed between a lower main bearing cover plate of the compressor and a convex part of the crankshaft, and the second main bearing oil pool is communicated with a bearing hole of the lower main bearing cover plate so as to lubricate the second main bearing through lubricating oil in the second main bearing oil pool.

According to a preferred embodiment the lower main bearing cover plate is provided with a receiving cavity above the bearing bore of the lower main bearing cover plate, and the diameter 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.

According to a preferred embodiment, the bearing hole of the upper bracket is further communicated with the bearing hole of the lower main bearing cover plate, so that lubricating oil in the first main bearing oil pool for lubricating the first main bearing can enter the bearing hole of the lower main bearing cover plate and lubricate the second main bearing.

According to a preferred embodiment, one side of the protruding portion close to the center is provided with at least one axial through hole, and the at least one axial through hole is arranged along the circumferential direction of the protruding portion, so that the bearing hole of the upper bracket is communicated with the bearing hole of the lower main bearing cover plate through the axial through hole.

According to a preferred embodiment, the oil sump assembly further comprises a communication portion for communicating the first main bearing oil sump and the second main bearing oil sump, so that part of the lubricating oil in the first main bearing oil sump can enter the second main bearing oil sump through the communication portion.

According to a preferred embodiment, the communicating part comprises a drainage channel, a first drainage hole and a second drainage hole, wherein the drainage channel is a vertical channel located on an upper support of the compressor, the first drainage hole is a vertical drainage hole located on an end face of a lower main bearing cover plate of the compressor, the second drainage hole is a transverse drainage hole located on a side wall of the main bearing cover plate, the drainage channel is used for communicating the first main bearing oil pool with the first drainage hole, and the first drainage hole and the second main bearing oil pool are communicated through the second drainage hole.

The compressor of the present invention includes the main bearing mechanism according to any one of the aspects of the present invention.

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

the main bearing mechanism comprises a bearing assembly and an oil pool assembly, wherein the bearing assembly comprises at least two sections of main bearings, the at least two sections of main bearings are arranged in a split mode, and the height of each section of main bearing is lower than that of a single existing main bearing under the condition that the same limiting effect as that of the existing main bearing is kept; on the other hand, the oil pool assembly comprises at least two oil pools, and the number of the oil pools is not less than that of the main bearings, so that each section of the main bearings can be lubricated by lubricating oil in at least one oil pool.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a partial schematic view of a prior art scroll compressor;

FIG. 2 is a schematic view of a preferred embodiment of the compressor of the present invention;

FIG. 3 is a partial schematic view of FIG. 2;

FIG. 4 is a schematic view of a preferred embodiment of a lower main bearing cap plate of the present invention;

FIG. 5 is a schematic view of a preferred embodiment of a crankshaft of the present invention.

In the figure: 1', existing main bearing; 2', an existing upper bracket; 3', an existing oil pool; 1. a static scroll pan; 2. an upper housing; 3. a guide post; 4. an upper bracket; 5. a lower housing; 6. a motor; 7. a crankshaft; 701. a projection; 702. an axial through hole; 8. a cowling; 9. a lower support ring; 10. a lower cover; 11. a lower bracket; 12. a motor fixing frame; 13. a rotor; 14. a lower main bearing cover plate; 1401. mounting holes; 1402. a first drainage aperture; 1403. a second drainage aperture; 15. an eccentric sleeve; 16. a support plate; 17. a cross slip ring; 18. a movable scroll pan; 19. a partition plate; 20. an upper cover; 21. a connecting seat; 22. a check valve seat; 23. a sealing cover; 24. a first main bearing; 25. a second main bearing; 1A, a first main bearing oil pool; 2A, a drainage channel; 3A and a second main bearing oil pool.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

The main bearing mechanism and the compressor of the present invention will be described in detail with reference to fig. 2 to 5 and embodiments 1 and 2 of the specification.

Example 1

This embodiment explains the main bearing mechanism of the present invention in detail.

The main bearing mechanism of the embodiment comprises a bearing assembly and an oil pool assembly. The bearing assembly comprises at least two sections of main bearings, and the at least two sections of main bearings are arranged in a split manner; the oil pool assembly comprises at least two oil pools, the number of the oil pools is not less than that of the main bearings, and each main bearing can be lubricated by lubricating oil in at least one oil pool. Preferably, each main bearing section can be lubricated by lubricating oil in one oil pool, and can also be lubricated by lubricating oil in two or more oil pools.

The main bearing mechanism of the embodiment comprises a bearing assembly and an oil pool assembly, wherein the bearing assembly comprises at least two sections of main bearings, the at least two sections of main bearings are arranged in a split mode, and the height of each section of main bearing is lower than that of a single existing main bearing 1 'under the condition that the same limiting effect as that of the existing main bearing 1' is maintained; on the other hand, the oil bath subassembly includes two at least oil ponds, and the quantity of the main bearing is no less than to the quantity of oil pond, make every section of main bearing lubricate through the lubricating oil in at least one oil pond, the main bearing mechanism of this embodiment promptly, through reducing the height of every section of main bearing and through the lubricating oil in the oil pond to every section of main bearing segmentation lubrication, improve the lubrication efficiency of every section of main bearing, guarantee that every section of main bearing all can obtain fully lubricated, thereby can improve the reliability of compressor, the compressor main bearing highly too high leads to its lubrication insufficient among the prior art has been solved, cause compressor operational reliability's technical problem.

According to a preferred embodiment, 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, as shown in fig. 2 or 3. Lubricating oil in the first main bearing oil pool 1A is used for lubricating the first main bearing 24 or lubricating the first main bearing 24 and the second main bearing 25, and lubricating oil in the second main bearing oil pool 3A is used for lubricating the second main bearing 25. The bearing assembly of the preferred technical scheme of this embodiment includes two sections of main bearings to the oil sump subassembly includes two oil sumps, carries out segmentation lubrication to two sections of main bearings through two oil sumps, under the condition that satisfies the bearing assembly and to crankshaft 7's support requirement, has lubricated more abundant effect, can improve compressor's reliability.

According to a preferred embodiment, the first main bearing 24 is mounted in a bearing hole of the upper bracket 4 of the compressor, the second main bearing 25 is mounted in a bearing hole of the 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 bulge 701 of the crankshaft 7. Preferably, the first main bearing 24 and the second main bearing 25 are pressed into the bearing bore of the upper housing 4 and the bearing bore of the lower main bearing cover plate 14, respectively, by cold pressing. Preferably, the crankshaft 7 of the preferred embodiment has a structure with a small diameter at both ends and a large diameter at the middle, and the part with a large diameter at the middle is the protrusion 701 of the preferred embodiment, and the first main bearing 24 and the second main bearing 25 can be separated by the protrusion 701.

According to a preferred embodiment, a first main bearing oil sump 1A is located on the compressor upper bracket 4 and communicates with the bearing bore of the upper bracket 4 to lubricate the first main bearing 24 with lubrication oil in the first main bearing oil sump 1A. The second main bearing oil pool 3A is located at a gap formed between the compressor lower main bearing cover plate 14 and the convex portion 701 of the crankshaft 7, and the second main bearing oil pool 3A is communicated with a bearing hole of the lower main bearing cover plate 14 to lubricate the second main bearing 25 by the lubricating oil in the second main bearing oil pool 3A.

Preferably, the lower main bearing cover plate 14 is provided with a receiving cavity, the receiving cavity is located above a bearing hole of the lower main bearing cover plate 14, a hole diameter of the receiving cavity is larger than a diameter of the protrusion 701, and a height of the receiving cavity is larger than a height of the protrusion 701, so that after the lower main bearing cover plate 14 is installed at the lower end of the upper bracket 4, a gap can be formed between the receiving cavity and the protrusion 701, as shown in fig. 2 to 5. Specifically, a plurality of mounting holes 1401 are formed in the circumferential direction of the lower main bearing cover plate 14, the lower main bearing cover plate 14 is fixed to the lower end of the upper bracket 4 by screws mounted in the mounting holes 1401, a second main bearing oil pool 3A is formed in a gap between the lower main bearing cover plate 14 and the protruding portion 701, and the second main bearing 25 can be lubricated by lubricating oil in the second main bearing oil pool 3A, as shown in fig. 2 to 5.

According to a preferred embodiment, the bearing bore of the upper bracket 4 is further in communication with the bearing bore of the lower main bearing cap plate 14, so that the lubricating oil in the first main bearing oil pool 1A used for lubricating the first main bearing 24 can enter the bearing bore of the lower main bearing cap plate 14 and lubricate the second main bearing 25. Preferably, one side of the protrusion 701 close to the center is provided with at least one axial through hole 702, and the at least one axial through hole 702 is arranged along the circumferential direction of the protrusion 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, as shown in fig. 2, 3 or 5. In the preferred technical scheme of this embodiment, the axial through hole 702 is formed in one side of the protruding portion 701 close to the center, so that the lubricating oil in the first main bearing oil pool 1A for lubricating the first main bearing 24 can 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. That is, the preferred technical scheme of this embodiment not only can lubricate through the lubricating oil in the second main bearing oil pool 3A, but also can lubricate through the lubricating oil used for lubricating the first main bearing 24 in the first main bearing oil pool 1A, and can ensure that the second main bearing 25 can obtain sufficient lubricating effect.

According to a preferred embodiment, the oil sump assembly further comprises a communication for communicating the first main bearing oil sump 1A and the second main bearing oil sump 3A, such that part of the lubricating oil in the first main bearing oil sump 1A can enter the second main bearing oil sump 3A through the communication. Preferably, the communication portion includes a drainage channel 2A, a first drainage hole 1402 and a second drainage hole 1403, as shown in FIGS. 2-4. Wherein, drainage channel 2A is the vertical passageway that is located compressor upper bracket 4, and vertical drainage hole on the 14 terminal surfaces of main bearing cover plate 1402 is for being located the compressor down, and horizontal drainage hole on the 14 lateral walls of main bearing cover plate is located down to second drainage hole 1403 to drainage channel 2A is used for communicating first main bearing oil pool 1A and first drainage hole 1402, and first drainage hole 1402 and second main bearing oil pool 3A communicate through second drainage hole 1403. As shown in fig. 2 or 3, second drain holes 1403 are opened toward the side of the receiving cavity, and second drain holes 1403 do not penetrate the side wall of lower main bearing cover plate 14, so that leakage of lubricating oil can be prevented. The oil pool assembly of the preferred technical scheme of this embodiment further comprises a communicating part, so that part of lubricating oil in the first main bearing oil pool 1A can enter the second main bearing oil pool 3A through the drainage channel 2A, the first drainage hole 1402 and the second drainage hole 1403 in sequence.

Lubricating oil in the first main bearing oil pool 1A of the preferred technical scheme of this embodiment is partly used for lubricating second main bearing 25 again after lubricating first main bearing 24, and another part gets into in second main bearing oil pool 3A and lubricates second main bearing 25 through the intercommunication portion, not only can improve the utilization ratio of lubricating oil, can also improve the lubricated effect of each section main bearing.

It can be known that the bearing assembly of the preferred embodiment includes no two main bearing segments, and the oil pool assembly includes no two oil pools. According to the method of the above technical solution, by increasing the number of the lower main bearing cover plates 14 and the number of the protrusions 701 on the crankshaft 7, the main bearing mechanism of this embodiment may also be provided with three or more main bearings and three or more oil pools.

Example 2

The compressor of the present embodiment includes the main bearing mechanism according to any one of embodiments 1. Preferably, the compressor of the present embodiment is a scroll compressor. More preferably, the compressor of the present embodiment is a scroll compressor for an air conditioner or a heat pump.

The remaining components of the scroll compressor are the same as the existing scroll compressor. As shown in fig. 2, the scroll compressor of the present embodiment is mainly composed of a motor 6, an upper bracket 4, a lower bracket 11, a fixed scroll 1, a movable scroll 18, an oldham ring 17, a crankshaft 7, and the like. The movable scroll disk 18 and the fixed scroll disk 1 are oppositely arranged on the upper bracket 4 with a phase angle difference of 180 degrees, the movable scroll disk 18 moves under the driving of the crankshaft 7 and is engaged with the fixed scroll disk 1 to form a series of crescent closed cavities which are mutually isolated and continuously changed in volume. When the compressor runs, the motor 6 drives the crankshaft 7 to rotate, the crank section of the crankshaft 7 is provided with the radially flexible eccentric sleeve 15, the eccentric sleeve 15 drives the movable scroll disk 18 to move, and the movable scroll disk 18 makes translational motion around the center of the crankshaft 7 with a fixed radius under the limitation of autorotation prevention of the cross slip ring 17. Refrigerant entering from the air suction pipe is sucked into a crescent suction cavity formed by the movable scroll disk 18 and the fixed scroll disk 1, is compressed, enters a high pressure cavity formed by the upper cover 20 and the partition plate 19 through the exhaust hole of the fixed scroll disk 1 and the check valve seat 22, and is then discharged through the exhaust pipe.

Referring again to fig. 2, the scroll compressor further includes a scroll compressor having an upper shell 2, a lower shell 5, an upper cover 20 and a lower cover 10 forming a hermetic container. The motor 6 comprises a rotor 13 sleeved outside the crankshaft 7 and a stator arranged outside the rotor 13, the motor 6 is fixed on the motor fixing frame 12, and a fairing 8 is arranged outside the motor 6. The scroll compressor also comprises a guide post 3, a lower support ring 9, a support plate 16, a connecting seat 21 and a sealing cover 23.

The compressor of this embodiment includes any technical scheme's in embodiment 1 main bearing mechanism, through main bearing mechanism's effect, not only can improve the lubrication efficiency of every section of main bearing, still can guarantee that every section of main bearing all can obtain fully lubricated, has improved the reliability of compressor, has solved among the prior art compressor main bearing highly too high and has leaded to its lubrication insufficient, causes compressor operational reliability's technical problem.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.