Sealing device for variable-working-condition gas-liquid two-phase fluid medium

Abstract

The invention relates to a sealing device for a variable-working-condition gas-liquid two-phase fluid medium. The sealing device is provided with a rotating shaft and a shell, and a cavity formed by the shell is used for containing a gas-liquid two-phase fluid medium; and the sealing device further comprises a labyrinth sealing mechanism and a fluid dynamic pressure mechanical sealing mechanism with double end faces, the labyrinth sealing mechanism and the fluid dynamic pressure mechanical sealing mechanism cooperate with each other, a sealing buffer cavity is formed between the labyrinth sealing mechanism and the fluid dynamic pressure mechanical sealing mechanism, and the fluid dynamic pressure mechanical sealing mechanism is provided with a static ring and a movable ring which abut against each other. Through the design of the stepped trapezoidal convex teeth of a labyrinth sealing channel and the utilization of the throttling and pressure reducing effects of the labyrinth sealing,the attenuation of the sealing buffer cavity to the medium pressure fluctuation, the structural design of a micropore group of the end surface of the static ring, the inclined design of the seal end surface of the movable ring and the limiting effect of a limiting sleeve, good sealing performance and sealing stability of dynamic pressure sealing of the variable-working-condition gas-liquid two-phase fluid medium are achieved.

Description

technical field [0001] The invention relates to the technical field of sealing devices, in particular to a sealing device for a gas-liquid two-phase fluid medium under variable working conditions. Background technique [0002] In the prior art, the fluid medium conveyed in the working chamber of some rotating machines is a gas-liquid two-phase fluid medium. When the working conditions of the rotating machinery change, the pressure of the gas-liquid two-phase fluid medium will fluctuate greatly. Since the gas is a compressible fluid, the gas will be compressed when the pressure increases, so that its volume ratio in the medium will decrease; and when the pressure decreases, the gas will expand, so that its volume ratio in the medium will increase. [0003] In the existing fluid dynamic mechanical seal devices, especially those with gas-liquid two-phase fluid medium, when the working conditions change, the opening failure of the end face often leads to the failure of the seal...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to solve the problem of poor sealing stability and weak adaptability of the gas-liquid two-phase fluid medium when the working conditions change, the present invention provides a sealing seal for the gas-liquid two-phase fluid medium under variable working conditions. device to solve the above problems

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