Profiled groove end surface non-contact mechanical seal with backflow function

Abstract

The invention discloses a profiled groove end surface non-contact mechanical seal with a backflow function. The profiled groove end surface non-contact mechanical seal comprises a mechanical seal moving ring and a mechanical seal static ring, wherein one side of the end surface of each of the moving ring and the static ring is a high-pressure side, i.e. an upstream; the other side of the end surface of each of the moving ring and the static ring is a low-pressure side, i.e. downstream; the downstream of the end surface is provided with an annular sealing dam of a smooth plane; and at least one sealing end surface in the moving ring and the static ring is provided with a plurality of groups of fluid profiled grooves. The profiled groove end surface non-contact mechanical seal with a backflow function is characterized in that the fluid profiled groove is formed by compounding the drainage groove and a pumping reflux groove, wherein the average groove depth of the drainage groove is more than the average groove depth of the pumping reflux groove; the drainage groove is arranged on the upstream of the end surface and is communicated with sealing medium; the pumping reflux groove is the profiled groove with the appearance structure characteristic of a flying bird wing; the groove depth is in the variation rule that the middle is deep and two sides are shallow; and the tail ends of two sides of the pumping reflux groove has a certain space with the upper stream of the end surface. The profiled groove end surface non-contact mechanical seal has dual actions of upstream pumping and downstream pumping to the sealing medium, the leakage amount is reduced, and the operation reliability of sealing is improved.

Description

technical field [0001] The invention relates to a groove end face non-contact mechanical seal with backflow function, which is suitable for the shaft end seal of various centrifugal pumps, screw pumps and other liquid conveying rotating machines, and is especially suitable for the medium that is easy to vaporize and has poor lubricating performance. The sealing belongs to the technical field of fluid sealing. Background technique [0002] Usually, a non-contact mechanical seal device is composed of system components such as a moving ring, a static ring and transmission components, a thrust assembly, an auxiliary sealing ring, and a sealing auxiliary system. In order to improve the working reliability of general mechanical seals, enhance the lubrication effect of the sealing end face, avoid end face wear, and reduce the friction coefficient, a certain surface texture or groove is often set on the end face of the moving ring or static ring, such as spiral groove, T-shaped gro...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high cost, high difficulty in implementation, and inconspicuous lubricating and return effects in the existing end face sealing structure, the present invention provides a method that can give full play to the comprehensive effect of the hydrodynamic pressure groove and improve the end face. Non-contact mechanical seal with groove end face and backflow function for lubricating cooling effect and reducing leakage

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