Piston structure for closed type compressor

Abstract

The invention discloses a piston structure for closed type compressor, wherein the compressor comprises a shell which consists of a cylindrical body, an upper cover and a lower cover, a motor and a compressor assembly are installed in the shell, the motor consists of a stator, a rotor and a crankshaft, the compressor assembly consists of a cylinder, an upper bearing and a lower bearing, and a plurality of evenly distributed spiral grooves are arranged along an inner cylindrical face on the upper end face of a piston and are used for storing a part of lubricating oil so as to form an oil film with a certain thickness and enough strength on the end face of the piston, therefore the leakage of refrigerant gas from the end face of the piston can be reduced, the purpose for sealing the end face is achieved, friction is lowered, and the efficiency and the service life of the compressor can be improved.

Description

technical field [0001] The invention belongs to a compressor, in particular to a piston structure of a hermetic compressor which forms a stable oil film on the piston end surface and can reduce the leakage of refrigerant gas. Background technique [0002] Such as figure 1 , 2 As shown, the hermetic compressor in the prior art includes a motor 20 installed on the inner upper side of the housing 1 , and a compressor assembly 30 installed at a certain distance on the lower side of the motor 20 . The casing 1 is composed of a hollow cylindrical body 11 , an upper cover 12 , a lower cover 13 and the like. The motor 20 is press-fitted and fixed on the inner peripheral surface of the cylinder 11, and it is composed of a stator 21, a rotor 22, and a rotating crankshaft 23 that is press-fitted and fixed at the center of the rotor 22 and transmits rotational force. [0003] The compressor assembly 30 includes a cylinder 31, an upper bearing 32 and a lower bearing 33. The eccentric ...

AI Technical Summary

Problems solved by technology

[0006] However, in the hermetic compressor of the prior art, since the two ends of the piston form a smooth plane, the oil film on the piston end surface is insufficiently formed, and the strength of the oil film is insufficient, and there is an end surface leakage phenomenon, that is, the refrigerant gas in the high-pressure chamber leaks into the low-pressure chamber

Affect the performance and life of the compressor

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