Gas-lubricated bird-wing-shaped groove end face seal structure

Abstract

A gas lubrication bird-wing-shape-imitation v groove end face sealing structure comprises two sealing rings with sealed end faces; the two sealing rings comprise a movable ring and a static ring; the end face of at least one of the movable ring and the static ring is provided with a plurality of bird-wing-shape-imitation v grooves; each bird-wing-shape-imitation v groove is composed of a tail-feather-shape-imitation v groove body and a flight-feather-shape-imitation v groove body; the tail-feather-shape-imitation v groove bodies are provided with swallow-tail-shaped furcal tails; the flight-feather-shape-imitation v groove bodies are roughly in a bull horn shape with the thick ends and the tail tip ends; the tail-feather-shape-imitation v groove bodies are transversely arranged at the thick ends of the flight-feather-shape-imitation v groove bodies; the thick segments of the flight-feather-shape-imitation v groove bodies and the thick ends of the tail-feather-shape-imitation v groove bodies are toward airflow; the bird-wing-shape-imitation v grooves are arranged to be bird-wing-shape-imitation v groove annular belts; secondary annular sealing dams are arranged between the bird-wing-shape-imitation v groove annular belts; annular main sealing dams are arranged on the low-pressure sides of the end faces; drainage grooves are arranged on the high-pressure sides of the end faces; the drainage grooves and the bird-wing-shape-imitation v grooves are shallow grooves of the micrometer scale; the depths of the flight-feather-shape-imitation v groove bodies are gradually decreased in the airflow direction. The sealing structure has the advantages of being good in stability and long in service life, and resisting abrasion.

Description

Technical field: [0001] The invention relates to a gas-lubricated end-face mechanical seal structure of a rotary fluid machine, in particular to a gas-lubricated imitation bird-wing-shaped groove end-face seal structure, which is suitable for shafts used for rotating shafts of various compressors, pumps, and kettles. The end sealing device is especially suitable for the shaft end sealing of the gas seal medium with frequent start and stop under medium and low pressure or medium and low speed, and belongs to the technical field of mechanical end face sealing. Background technique: [0002] The known fluid dynamic pressure type groove end face mechanical seal still has some disadvantages, for example: when the non-contact mechanical seal of the groove end face such as spiral groove is in normal operation, the end face groove generates hydrodynamic pressure to increase the opening force of the end face , the increase of the fluid film thickness leads to an increase in the leaka...

AI Technical Summary

Problems solved by technology

[0003] The invention aims to overcome the problems of the gas-lubricated non-contact mechanical seal in the prior art that the sealing end face wears out when the seal is started, and the seal failure is caused, and the opening force is too small so that the end face cannot be opened in time, and provides a low-speed and low-pressure operating condition with good opening performance and stability. Good, bird-wing-shaped grooved face seal that effectively prevents face wear during start-up and shutdown

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