Air film sealing structure of foil end face with microporous texture on foil surface

Abstract

A foil piece end face gas film sealed structure with a foil piece surface provided with a micropore texture comprises a gas film sealed movable ring and a gas film sealed fixed ring; the sealing end face of at least one sealing ring in the movable ring or the fixed ring is a foil piece end face with a surface texture; the sealing ring with the foil piece end face comprises an annular ring body, sector-shaped rubber gaskets and an annular foil piece; the outer side of the ring body is sunken with small amplitude to form an annular concave face; the inner side of the ring body protrudes with small amplitude to form an annular step; a sealing dam is formed on the upper surface of the annular step; a plurality of sector-shaped grooves symmetrically distributed according to the rotating center are evenly formed in the annular concave face; one sector-shaped rubber gasket is placed in each sector-shaped groove; the upper surfaces of the sector-shaped rubber gaskets and the annular concave face are flush; the upper surface of the annular foil piece is provided with a micropore annular belt; the lower surface of the annular foil piece is closely attached to the annular concave face; the upper surface of the annular foil piece is flush with the sealing dam; a plurality of pore columns formed by micropores are evenly distributed in the micropore annular belt in the radial direction of the annular foil piece; sealing weirs are formed between the pore columns; and the micropore columns and the sector-shaped grooves are distributed in a staggered manner.

Description

(1) Technical field [0001] The invention relates to the technical field of mechanical end face sealing structure design, in particular to a foil end face air film sealing structure with a microporous texture on the foil surface, especially suitable for shaft end sealing devices of high-pressure and high-speed rotating machines. (2) Background technology [0002] Mechanical seals are widely used in shaft end seals of rotating machinery due to their significant performance advantages such as low leakage, low power consumption, and long life, such as shaft end seals of compressors, pumps, reactors, and fans. The rapid development of the petrochemical industry and aerospace requires mechanical seals to be able to adapt to high parameters, variable working conditions and harsh sealing environments. Microporous end face seals are widely used because they can effectively adapt to sealing occasions with high solid particle content, and have better wear resistance and operational rel...

AI Technical Summary

Problems solved by technology

Microporous end face seals are widely used because they can effectively adapt to sealing occasions with high solid particle content, and have better wear resistance and operational reliability. At present, many different forms of microporous end face seals have been developed at home and abroad, including Various microporous sealing end surface structures such as circular micropores, directional micropores, double-row inclined directional micropores, and spike-shaped micropores, etc., but due to the poor fluid dynamic pressure effect of the micropores, the fluid film formed has a relatively low carrying capacity. Poor, and in the start-stop stage under high-pressure conditions, the gas is not easy to enter the hole area, and the end face is prone to dry grinding, especially under high-speed and variable working conditions, the external disturbance is large, and the sealing ability of ordinary micro-porous end faces is poor. The sealing end face is prone to collision and partial wear, resulting in damage to the microporous texture and seriously reducing the performance advantage of the microporous end face seal

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