Combined compressor piston ring

Abstract

The invention discloses a combined compressor piston ring, comprising a main piston ring and an inner secondary piston ring; the main piston ring and the inner secondary piston ring are combined for use, have the same height and are provided with a notch respectively; the two notches are arranged in a mutually staggered mode; U-shaped unloading slots are arranged at the outer cylindrical surface of the main piston ring; the height of the outer ring sides of the main piston ring is two times that of the inner ring sides of the main piston ring; the height of the outer ring sides of the inner secondary piston rings is half that of the inner ring side of the inner secondary piston ring; the thicknesses of the inner ring sides and the outer ring sides of the main piston ring and the inner secondary piston ring are same and equal to the distances between the outer ring sides and the inner ring sides. Gaps of the notches can be effectively blocked and the sealing property of the piston ring is improved.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a piston ring structure in a compressor. Background technique [0002] In a reciprocating compressor, a piston ring is usually installed on the piston, and the piston ring is used to seal the gap between the piston and the mirror surface of the cylinder, which mainly plays a sealing role. The existing piston ring mainly has two problems of fast wear and poor sealing performance. [0003] The problem of excessive wear of the piston ring is determined to a certain extent by the improper selection of the piston ring. For the same metal material for grinding, different media have different wear factors for the same formula of filled PTFE rings. ; For the same medium, different grinding metal materials have different wear factors for the same formulation of filled PTFE rings. [0004] Regarding the sealing of the piston ring, if the outer edge of the piston ring is to closely fi...

AI Technical Summary

Problems solved by technology

[0004] Regarding the sealing of the piston ring, if the outer edge of the piston ring is to closely fit the cylinder mirror surface, the piston ring must obtain a certain effective elasticity, so the piston ring must be made with a cut; if the piston ring does not have a cut, it cannot obtain the initial Elasticity, the piston ring does not necessarily stick to the mirror surface of the cylinder. When the compressor compresses the gas, the high-pressure gas may leak from the gap between the piston ring and the cylinder.

When the piston ring with notch is working normally, due to the notch of the piston ring, the gap at the notch of the piston ring will become larger and larger during long-term use, which will affect the airtightness of the compressor.

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