Radial flexible mechanism of scroll compressor

Abstract

The radial flexible mechanism of the scroll compressor comprises a main shaft, a crankshaft seat is arranged at the output end of the main shaft, an eccentric hole is axially formed in the end portion of the end, away from the main shaft, of the crankshaft seat, and a crank pin is fixedly connected into the eccentric hole. The outer side of the end, away from the crankshaft seat, of the crank pin is fixedly sleeved with an eccentric shaft sleeve, one side of the eccentric shaft sleeve is fixedly connected with an eccentric block, a limiting groove is formed in the outer side of the end, close to the eccentric block, of the crankshaft seat, and an elastic washer is arranged on the inner side of the limiting groove. The groove is formed in the outer side of the crankshaft seat on the main shaft, and the rubber ring is fixed on the crankshaft, so that the collision between the eccentric block and the crankshaft is avoided, and the NVH (Noise Vibration and Harshness) performance is favorably improved; due to the fact that the rubber ring is additionally arranged, the self-aligning function has a buffering function, too intense self-aligning and rollback are avoided, and the movable disc of the compressor is more stable in operation, low in noise and good in NVH expression homogeneity.

Description

Technical Field

[0001] This utility model relates to the field of scroll compressor technology, and in particular to a radial flexible mechanism for a scroll compressor. Background Technology

[0002] The flexible sealing mechanism is one of the main components of a scroll compressor. Its eccentric part drives the moving scroll to revolve around the center of the main shaft, causing the moving and stationary scrolls to mesh and achieve periodic changes in the closed working volume, realizing the intake, compression, and discharge of gas. Due to the complexity of the scroll profile, unavoidable machining and assembly accuracy errors will inevitably occur during actual production. These errors can lead to excessive meshing clearance or excessive mutual compression between the sidewalls of the moving and stationary scrolls. The former will exacerbate tangential leakage caused by the radial clearance channel, while the latter will cause severe wear of the scroll body and scratches caused by liquid accumulation or solid particles in the working chamber. These consequences will seriously affect the working performance of the scroll compressor. Scroll compressors typically use a radial flexible sealing structure. This flexible mechanism allows the radial distance between the moving scroll and the stationary scroll to be adjustable, i.e., fine adjustment of the rotation radius. Under the action of centrifugal inertial force, the moving scroll can always achieve meshing between the two scroll bodies with minimal radial clearance, reducing gas leakage between the high and low compression chambers caused by this leakage channel, effectively avoiding the problems mentioned above.

[0003] The schematic diagram of the radial flexible mechanism is as follows: Figure 1 As shown, the entire mechanism consists of a main shaft with a crank pin and an eccentric block structure with a counterweight on its edge. Point A is the center of the main shaft (i.e., the stationary scroll), point B is the center of the crank pin, and point C is the center of the eccentric block, which is also concentric with the moving scroll. Point C is the center of the moving scroll. These three points form a dynamically moving flexible triangle, where LAB is the value of the crank radius on the main shaft. The structures of the main shaft and the eccentric block are fixed, meaning LAB and LBC are constant values, and LAC is the theoretical radius of rotation, Ror. When the center of the moving scroll, point C, moves in a planar circular motion around the center of the stationary scroll, point A, the radius of rotation, LAC (Ror), will change accordingly (caused by the rotation of the eccentric block around point O).

[0004] However, two drawbacks were found during the application of this structure. First, when the scroll compressor starts, the crankshaft rotates first while the eccentric block rotates later. The outer edge of the crankshaft will hit the inner ring of the counterweight below the eccentric block, which may cause an impact noise when the compressor starts. When applied to automotive compressors, the NVH performance is poor, causing customer complaints. Second, during the operation of the compressor, there may be some situations where the load is too heavy or the refrigerant contains impurities. At this time, the eccentric block will rotate around point B, causing the moving and stationary scroll walls to lose contact. However, at the same time, it may also cause the inner ring of the lower counterweight eccentric block to hit the main shaft, causing abnormal noise, which still affects the NVH performance and has room for further improvement. Utility Model Content

[0005] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a radial flexible mechanism for a scroll compressor that can avoid the impact between the inner ring of the eccentric block's counterweight and the main shaft without changing the radial flexibility capability, thereby improving NVH performance and solving the above-mentioned problems.

[0006] To achieve the above objectives, a radial flexible mechanism for a scroll compressor is provided, comprising a main shaft, a crankshaft seat at the output end of the main shaft, an eccentric hole axially formed at the end of the crankshaft seat away from the main shaft, a crank pin fixedly connected inside the eccentric hole, an eccentric bushing fixedly sleeved on the outer side of the end of the crank pin away from the crankshaft seat, an eccentric block fixedly connected to one side of the eccentric bushing, a limiting groove formed on the outer side of the end of the crankshaft seat near the eccentric block, and an elastic washer provided on the inner side of the limiting groove.

[0007] According to the radial flexible mechanism of a scroll compressor, the inner side of the eccentric block covers the outer side of the crankshaft seat where a limiting groove is opened.

[0008] According to the radial flexible mechanism of the scroll compressor, the thickness of the elastic washer is the sum of the depth of the limiting groove and the distance between the eccentric block and the surface gap of the crankshaft seat. While ensuring the buffering capacity, the elastic washer reduces the obstruction of the eccentric block during assembly.

[0009] According to the radial flexible mechanism of the scroll compressor, the center of gravity of the eccentric block and the center of gravity of the scroll compressor's moving scroll are located on opposite sides of the axis of the main shaft.

[0010] According to the radial flexible mechanism of the scroll compressor, the elastic gasket is a high-temperature resistant fluororubber gasket available on the market.

[0011] The above solution has at least one of the following beneficial effects:

[0012] Compared with the prior art, this utility model fixes the rubber ring to the crankshaft by slotting the outside of the crankshaft seat on the main shaft, thus avoiding the impact between the eccentric block and the crankshaft and improving NVH performance. The addition of the rubber ring provides a buffer for the self-aligning function, preventing excessively violent self-aligning and retraction. Therefore, the operation of the compressor's moving plate is more stable, with lower noise and better NVH performance consistency. At the same time, the structure is simple, with fewer parts, reducing the precision requirements, facilitating production, processing and assembly, reducing production costs, and enhancing the practicality of the device.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0015] Figure 1 This is a schematic diagram of an existing radial flexible mechanism;

[0016] Figure 2 This is a three-dimensional structural diagram of a radial flexible mechanism for a scroll compressor according to the present invention;

[0017] Figure 3 This is an isometric view of a radial flexible mechanism for a scroll compressor according to the present invention.

[0018] Figure 4 This is a schematic diagram of the internal structure of a radial flexible mechanism for a scroll compressor according to this utility model.

[0019] Legend:

[0020] 1. Main shaft; 2. Crankshaft seat; 3. Eccentric hole; 4. Crank pin; 5. Eccentric bushing; 6. Eccentric block; 7. Limiting groove; 8. Elastic washer. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. Preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present utility model. The drawings are all in a very simplified form and use non-precise proportions. They are only used to help to explain the embodiments of the present utility model in a convenient and clear way, and should not be construed as limiting the scope of protection of the present utility model.

[0022] Reference Figure 1-4 This utility model provides a radial flexible mechanism for a scroll compressor, including a main shaft 1, a crankshaft seat 2 at the output end of the main shaft 1, an eccentric hole 3 axially opened at the end of the crankshaft seat 2 away from the main shaft 1, a crank pin 4 fixedly connected inside the eccentric hole 3, an eccentric bushing 5 fixedly sleeved on the outer side of the end of the crank pin 4 away from the crankshaft seat 2, an eccentric block 6 fixedly connected to one side of the eccentric bushing 5, the center of gravity of the eccentric block 6 and the center of gravity of the scroll compressor's moving scroll are respectively set on both sides of the axis of the main shaft 1, for configuration balance during high-speed operation and to prevent vibration;

[0023] A limiting groove 7 is provided on the outer side of the crankshaft seat 2 near the eccentric block 6. The inner side of the eccentric block 6 covers the position of the limiting groove 7 on the outer side of the crankshaft seat 2. An elastic washer 8 is provided on the inner side of the limiting groove 7. The elastic washer 8 is a high-temperature resistant fluororubber washer available on the market. The thickness of the elastic washer 8 is the sum of the depth of the limiting groove 7 and the surface clearance between the eccentric block 6 and the crankshaft seat 2. The rubber ring can buffer the self-aligning function, avoid excessive self-aligning and retraction, and make the compressor's moving plate run more stably, with low noise and good NVH performance consistency.

[0024] Working principle: This utility model forms a limiting groove 7 by slotting the crankshaft seat 2 of the main shaft 1, and fixes the elastic washer 8 on the crankshaft, thus avoiding the impact between the eccentric block 6 and the crankshaft seat 2, which is beneficial to improving NVH performance. Since the addition of the rubber ring buffers the self-aligning function, it avoids excessive self-aligning and retraction, so the operation of the compressor's moving plate is more stable, the noise is lower, and the NVH performance is more consistent. At the same time, due to the simple structure and fewer parts, the buffering of the elastic washer 8 reduces the requirements for fit, which can reduce the requirements for machining accuracy, making production, processing and assembly convenient and reducing production costs.

[0025] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A radially flexible mechanism for a scroll compressor, comprising a main shaft (1), characterized in that: A crankshaft seat (2) is provided at the output end of the main shaft (1). An eccentric hole (3) is axially opened at the end of the crankshaft seat (2) away from the main shaft (1). A crank pin (4) is fixedly connected inside the eccentric hole (3). An eccentric bushing (5) is fixedly sleeved on the outer side of the end of the crank pin (4) away from the crankshaft seat (2). An eccentric block (6) is fixedly connected on one side of the eccentric bushing (5). A limiting groove (7) is opened on the outer side of the end of the crankshaft seat (2) near the eccentric block (6). An elastic washer (8) is provided on the inner side of the limiting groove (7).

2. The radial flexible mechanism for a scroll compressor according to claim 1, characterized in that, The inner side of the eccentric block (6) covers the outer side of the crankshaft seat (2) where the limiting groove (7) is opened.

3. The radial flexible mechanism for a scroll compressor according to claim 1, characterized in that, The thickness of the elastic washer (8) is the sum of the depth of the limiting groove (7) and the surface clearance distance between the eccentric block (6) and the crankshaft seat (2).

4. The radial flexible mechanism for a scroll compressor according to claim 1, characterized in that, The center of gravity of the eccentric block (6) and the center of gravity of the scroll compressor's moving scroll are respectively located on both sides of the axis of the main shaft (1).

5. The radial flexible mechanism for a scroll compressor according to claim 1, characterized in that, The elastic gasket (8) is a high-temperature resistant fluororubber gasket currently available on the market.

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