Compressor high-pressure oil-free packing seal structure

Abstract

The invention provides a compressor high-pressure oil-free packing seal structure which is used for solving the problem that in the prior art, a seal element bears large seal pressure differences, andcold flow becomes ineffective. The high-pressure oil-free packing seal structure provided by the invention comprises a packing gland, a front end packing box and a packing box set, wherein the frontend packing box is coaxially arranged with the packing gland and is close to an air cylinder; the packing box set is located between the packing gland and the front end packing box; a piston rod sequentially penetrates through the packing gland, the packing box set and the front end packing box; the packing box set is internally provided with a plurality of seal ring sets which are arranged on thepiston rod in a sleeving mode, a buffering cavity is formed in the packing box set, and air in an air feeding pipe of the air cylinder is guided into the buffering cavity through a guiding pressure pipe; and the seal ring sets comprise air barrier rings, and working surfaces of the inner circles of the air barrier rings are provided with pressure balance grooves.

Description

technical field [0001] The invention relates to the field of sealing and the field of compressors, in particular to a high-pressure oil-free packing sealing structure of a compressor. Background technique [0002] In large and medium-sized reciprocating compressors, the packing seal is used to seal the high-pressure gas in the cylinder on the shaft side to prevent and reduce the leakage of gas through the gap between the piston rod and the cylinder. During the working process, the packing sealing element bears the sealing pressure difference and the thermal load of the friction surface. In high-pressure oil-free lubricated compressors, unfavorable factors such as huge sealing pressure difference and extremely high operating temperature seriously affect the performance and life of sealing components. Therefore, high-pressure oil-free packing sealing technology has always been the bottleneck restricting the long-term and stable operation of oil-free lubrication compressors. ...

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing cooling measures for stuffing box seals pass cooling water on the stuffing box, which cannot directly cool the friction surface, and the heat dissipation effect is poor.

Therefore, the high-pressure oil-free packing seal ring is subject to extremely high mechanical and thermal loads, and the actual working conditions are extremely harsh. The packing wears out rapidly in a short period of time and produces severe cold flow, and the service life is extremely short, which seriously affects the compressor. reliability

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