Ternary twisted groove end face mechanical seal structure

Abstract

A ternary distortion-type groove end surface mechanical sealing structure comprises a dynamic ring and a static ring which are used for mechanical sealing, ternary distortion-type grooves 1 evenly distributed in the circumferential direction are machined in the sealing end surface of at least one sealing ring of the dynamic ring and the static ring, and each ternary distortion-type groove is formed by two side walls and a three-dimensional distortion variable-depth groove bottom surface; the side walls of each ternary distortion-type groove comprise the windward side ternary distortion wall surface 11 and the leeward side ternary distortion wall surface 13, and the three-dimensional distortion variable-depth groove bottom surfaces 12 gradually shallow in a distortion shape from the outer circumferential side walls of the sealing rings to the centers of the sealing rings and intersect with the sealing end surfaces on the outer sides of sealing dams 3; the intersection lines of the side walls of the ternary distortion-type grooves 1 and the outer circumferential side walls of the sealing rings are perpendicular to the sealing end surfaces; the intersection lines of the side walls of the first ternary distortion-type grooves and the sealing end surfaces are each divided into two sections, the intersection lines on the medium inlet sides are helical lines, and the intersection lines on the medium leakage sides are radial straight lines.

Description

technical field [0001] The invention relates to a mechanical end face sealing structure for a shaft end of a rotary fluid machine, in particular to a mechanical end face sealing structure of a three-dimensional twisted groove whose wall surface is a three-dimensional twisted surface, which is used for various compressors, pumps and Rotary shaft seals for rotating machines such as reactors. Background technique [0002] The gas-lubricated or liquid-lubricated non-contact mechanical seal with equal-depth spiral groove structure on the sealing end face has been widely used in medium and high-speed rotating machinery (such as centrifugal compressors, high-speed pumps, etc.) in petroleum, petrochemical and electric power industries. When the moving ring rotates, the fluid medium is pumped into the sealing end surface by using the dynamic and static pressure effect of the groove, the fluid medium entering the sealing end surface is blocked from flowing at the root of the groove an...

AI Technical Summary

Problems solved by technology

[0004] In order to improve the fluid film rigidity of the existing equal-depth or variable-depth typical spiral groove mechanical end seals under medium and high speed conditions, the fluid film rigidity is not large enough, and the seal leakage is relatively large. High rigidity, small leakage, ternary twisted groove mechanical end face seal structure suitable for medium and high speed operating conditions

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