A piston, a compressor having the same and a processing method for the piston

Abstract

The invention discloses a piston. The piston comprises a piston body, wherein grooves are formed in the peripheral faces of the piston body. Each groove includes a first groove section and a second groove section, wherein the first groove section is located in one side of a first central plane of the piston body, the second groove section is located in the other side of the first central plane, and the area of the second groove section is larger than the area of the first groove section; the first central plane is a plane of axes passing through the piston body. Since the grooves in the peripheral faces on the two sides of the piston body are different in area, a difference value exists between air force generated by air pressure in the grooves in the two sides; the difference value can be used for offsetting lateral component force of external force borne by the piston, so that lateral friction force of the piston is reduced, and reliability of the piston is improved. The invention also discloses a compressor and a machining method of the piston.

Description

technical field [0001] The invention relates to the technical field of piston compressors, in particular to a piston. The invention also relates to a compressor with the piston and a processing method for the piston. Background technique [0002] The core structure of a common piston compressor (such as a refrigerator piston compressor) is as follows: figure 1 and 2 shown. The moving parts of the compressor are mainly composed of frame 1, piston 3, piston pin 2, crankshaft 5, and connecting rod 4. The schematic diagram of the mechanism is as follows image 3 shown. During the working process, the thrust F of the piston 3 on the connecting rod 4 连杆 Compressed gas does work. The thrust F on the piston 连杆 Force F that can be decomposed into compressed gas 气体 and lateral force F 侧向 , while the reaction force F' on the crankshaft 连杆 Then it can be decomposed into rotational resistance F 转矩 and binding F 约束 . Among them, F 侧向 The presence of the piston causes one sid...

AI Technical Summary

Problems solved by technology

At the same time, in F 侧向 Under the action of the piston, the piston will deviate from the center position, so the leakage on both sides of the piston is different, resulting in different gas pressures on both sides of the piston and causing additional lateral force, which further increases the total lateral force on the piston

[0003] For this reason, in the prior art, an eccentricity e is usually set between the center of the piston and the center of rotation of the crankshaft to reduce the lateral component force F 侧向 size, but the effect is very limited

In addition, in the prior art, grooves are also provided on the outer peripheral surface of the piston body, such as Figure 4 A circle of grooves with a constant width is shown to equalize the pressure, and at the same time reduce the contact area between the piston and the cylinder wall, thereby reducing friction, but the lateral force on the piston is still relatively large

Therefore, the piston structure of the prior art hinders the further improvement of the performance of the compressor

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