Dynamic and static pressure mixing lubricating end face sealing structure

Abstract

The invention discloses a dynamic and static pressure mixing lubricating end face sealing structure which comprises a dual-end-face sealing structure, a single end face sealing structure and a seriesconnection sealing structure. The dual-end-face sealing structure feeds buffering gas to carry out zero leakage sealing on toxic and dangerous technological gas and comprises a static ring and a movable ring; the static ring has the axial degree of freedom and is provided with a lubricating gas passage, a lubricating gas pressure stabilization cavity, a porous medium friction pair and a high-precision displacement sensor and other structure; and the movable ring rotates along with a rotary shaft. Lubricating gas with adjustable pressure is fed to generate controllable gas static pressure; oneor more annular cavities penetrating through the circumferential direction are formed in the radial direction of the lubricating gas pressure stabilization cavity; the end face of the movable ring canbe a smooth end face, or a dynamic pressure groove structure is processed on the end face of the movable ring; and the groove type of the dynamic pressure groove has multiple manners including a traditional spiral groove, T-shaped groove or a novel rhombus groove structure. Under the extreme conditions including high temperature, high pressure, high rotating speed, ultralow temperature and the like, frequent start and halt and sealing of the mechanical shaft end of an impeller operating under variable working conditions can be realized.

Description

Technical field: [0001] The invention relates to a sealing structure, in particular to a non-contact gas dynamic pressure static pressure mixed lubrication end face seal used for the shaft end of a turbomachinery which can realize zero-leakage sealing. Background technique: [0002] As one of the key components of turbomachinery, the shaft end seal has a significant impact on the operating efficiency and safety of the turbomachinery due to its reliability and stability. Especially in the centrifugal compressors commonly used in the petrochemical industry, most of the process gases it transports are flammable, explosive, toxic and highly corrosive, and are usually in an ultra-high pressure and ultra-high temperature working environment. Once the seal fails, the process gas Leakage often leads to environmental pollution, fire, explosion and other major accidents. [0003] Dry gas seal is a non-contact gas lubricated mechanical seal, which is an advanced shaft end sealing tech...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a dynamic and static pressure mixed lubrication end face seal structure, which is used for reducing the shaft end leakage (or even zero leakage), improving the operation efficiency and safety and stability of the turbomachinery, and the dry gas seal cannot meet the requirements. The problem of shaft seal requirements under start-stop, variable working conditions and extreme conditions, which has porous media friction pairs, lubricating gas passages, lubricating gas stabilizing chambers and high-precision displacement sensors Ring, which can realize the dynamic and static pressure mixed gas lubrication end face sealing structure of dynamic pressure gas lubrication and static pressure gas lubrication, making it suitable for frequent start-stop and variable working conditions under extreme conditions such as high temperature, high pressure, high speed, and ultra-low temperature Sealing of shaft ends of turbomachinery running under

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