A low-wear cylinder block crankshaft mounting structure and compressor

Abstract

This invention relates to a low-wear cylinder block crankshaft mounting structure, comprising a cylinder block and a crankshaft. The cylinder block has a shaft hole, and the centerline of the long shaft of the crankshaft coincides with the centerline of the shaft hole. The inner wall of the shaft hole of the cylinder block has at least three axially arranged mounting grooves, each groove containing a roller. The roller is slidably connected to the mounting groove, and a portion of the roller protrudes towards the center of the shaft hole from the mounting groove. The outer wall of the long shaft contacts each roller, and a circumferential gap is provided between the outer wall of the long shaft and the inner wall of the shaft hole. By setting the rollers, this invention allows the rollers to contact the long shaft of the crankshaft, while the long shaft no longer contacts the inner wall of the shaft hole, changing from surface contact to line contact. This greatly reduces friction, improves compressor performance, and can also reduce compressor temperature rise to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration compressor technology, specifically a low-wear cylinder seat crankshaft mounting structure and compressor. Background Technology

[0002] The existing fully enclosed reciprocating refrigeration compressor cylinder seat crankshaft mounting structure generally involves the shaft hole contacting the long shaft of the crankshaft. During crankshaft operation, friction occurs between the outer wall of the long shaft and the inner wall of the shaft hole in the cylinder seat. This leads to several problems during operation: 1. Due to the large contact area between the long shaft and the shaft hole, the frictional force is significant, requiring more energy to overcome it during operation; 2. Under uneven load conditions, stress concentration can easily occur in the edge areas, leading to fretting wear of the compressor and, in severe cases, jamming; 3. Precision machining of the cylinder seat shaft hole is required, increasing processing costs. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the above-mentioned compressors and to provide a low-wear cylinder seat crankshaft mounting structure and compressor.

[0004] The specific solution of this utility model is: a low-wear cylinder seat crankshaft mounting structure, including a cylinder seat and a crankshaft. The cylinder seat is provided with a shaft hole. The center line of the long shaft of the crankshaft coincides with the center line of the shaft hole. The inner wall surface of the shaft hole of the cylinder seat is provided with at least three axially arranged mounting grooves. Each mounting groove is equipped with a roller. The roller is slidably connected to the mounting groove. A part of the roller protrudes into the mounting groove towards the center of the shaft hole. The outer wall surface of the long shaft contacts each roller. A circumferential gap is provided between the outer wall surface of the long shaft and the inner wall surface of the shaft hole.

[0005] Furthermore, the upper end of the mounting groove extends upward through the inner wall of the shaft hole, and the lower end of the mounting groove is spaced at a certain distance from the bottom surface of the shaft hole.

[0006] Furthermore, the spacing length is 2-5mm.

[0007] Furthermore, the length of the roller is matched with the length of the mounting groove.

[0008] Furthermore, the circumferential gap is 0.1-0.2 mm.

[0009] This utility model also provides a compressor that adopts the above-mentioned cylinder seat crankshaft mounting structure.

[0010] Compared with the prior art, this utility model has the following advantages: 1. By setting rollers, the rollers contact the long shaft of the crankshaft, and the long shaft no longer contacts the inner wall of the shaft hole, changing from surface contact to line contact, which can greatly reduce friction, improve the performance of the compressor, and also reduce the temperature rise of the compressor to a certain extent; 2. When an off-center load occurs, it can reduce stress concentration in the edge area to a certain extent, which can lead to fretting wear and jamming of the compressor; 3. It can eliminate the finishing process of the inner wall of the cylinder seat shaft hole, reducing certain processing costs. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0012] Figure 2 This is the front view of this utility model;

[0013] Figure 3 yes Figure 2 AA view;

[0014] Figure 4 yes Figure 3 BB view;

[0015] Figure 5 yes Figure 3 Enlarged view of point V;

[0016] In the diagram: 1. Cylinder seat; 2. Crankshaft; 3. Roller. Detailed Implementation

[0017] See Figure 1-5 This embodiment is a low-wear cylinder block crankshaft mounting structure, including a cylinder block 1 and a crankshaft 2. The cylinder block 1 is provided with a shaft hole. The centerline of the long shaft of the crankshaft 2 coincides with the centerline of the shaft hole. The inner wall of the shaft hole of the cylinder block 1 is provided with at least three axially arranged mounting grooves. Each mounting groove is equipped with a roller 3. The roller 3 is slidably connected to the mounting groove. A part of the roller 3 protrudes into the mounting groove towards the center of the shaft hole. The outer wall of the long shaft contacts each roller 3. A circumferential gap is provided between the outer wall of the long shaft and the inner wall of the shaft hole.

[0018] Furthermore, the upper end of the mounting groove extends upward through the inner wall of the shaft hole, and the lower end of the mounting groove is spaced at a certain distance from the bottom end of the shaft hole, so that the bottom end of the roller 3 is limited.

[0019] Furthermore, the spacing length is 2-5mm.

[0020] Furthermore, the length of the roller 3 matches the length of the mounting groove, and the top of the roller 3 is slightly lower than the mounting groove.

[0021] Furthermore, the circumferential gap is 0.1-0.2 mm.

[0022] This utility model also provides a compressor that adopts the above-mentioned cylinder seat crankshaft mounting structure.

[0023] During installation, the roller 3 is first inserted into the corresponding mounting groove from top to bottom, and the roller 3 naturally falls into place. Then, the crankshaft 2 is installed. The long shaft of the crankshaft 2 is inserted downward from the upper end of the shaft hole, and the bottom surface of the shaft shoulder naturally closes the top of each mounting groove, so that the roller 3 cannot be removed from the mounting groove.

[0024] After installation, the crankshaft 2 has no direct contact with the inner wall of the shaft hole, but only line contact with each roller 3. Therefore, during compressor operation, the frictional loss between the crankshaft 2 and the cylinder seat 1 is reduced. The rollers 3 described in this invention are made of stainless steel.

Claims

1. A low-wear cylinder block crankshaft mounting structure, comprising a cylinder block and a crankshaft, wherein the cylinder block is provided with a shaft hole, and the centerline of the major axis of the crankshaft coincides with the centerline of the shaft hole, characterized in that: The inner wall of the cylinder seat shaft hole is provided with at least three axially arranged mounting grooves. Each mounting groove contains a roller, which is slidably connected to the mounting groove. A portion of the roller protrudes into the mounting groove toward the center of the shaft hole. The outer wall of the long shaft contacts each roller, and a circumferential gap is provided between the outer wall of the long shaft and the inner wall of the shaft hole.

2. The low-wear cylinder seat crankshaft mounting structure according to claim 1, characterized in that: The upper end of the mounting groove extends upward through the inner wall of the shaft hole, and the lower end of the mounting groove is spaced a certain distance from the bottom surface of the shaft hole.

3. The low-wear cylinder seat crankshaft mounting structure according to claim 2, characterized in that: The spacing length is 2-5mm.

4. The low-wear cylinder seat crankshaft mounting structure according to claim 1, characterized in that: The length of the roller is matched with the length of the mounting groove.

5. The low-wear cylinder seat crankshaft mounting structure according to claim 1, characterized in that: The circumferential gap is 0.1-0.2 mm.

6. A compressor, characterized in that: The cylinder seat crankshaft mounting structure according to any one of claims 1-5 is adopted.

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