Mechanical seal structure of radial split groove end face with imitation bird wing fin groove

Abstract

The invention discloses a mechanical sealing structure for radial shunt type groove end faces of pinion-like grooves. The mechanical sealing structure comprises two mechanical sealing rings, namely a moving ring and a stationary ring, wherein a plurality of radial shunt type grooves of pinion-like grooves are distributed along peripheries and formed in the end surface of at least one mechanical sealing ring of the moving ring and the stationary ring; the radial shunt type grooves of pinion-like grooves are located at a high-pressure side of a medium, namely upstream; the radial shunt type grooves of pinion-like grooves comprise a drain groove and more than two shunt grooves adopting pinion-like groove structures; the drain groove is connected with the shunt grooves and is located on leeward sides of the shunt grooves; the shunt grooves are formed radially and stretch in a circumferential direction; uncut groove areas among the radial shunt type grooves of bird-wing-simulated grooves are sealing weirs; a ring belt which is formed in a circumferential uncut groove area on an end surface is a sealing dam; and the sealing dam is located on a low-pressure side of the end surface, namely downstream.

Description

technical field [0001] The invention relates to a gas end face mechanical seal structure of a rotary fluid machine, which is used for the gas seal of rotary shafts of various compressors, expanders, pumps, reaction kettles and other rotary machines. Background technique [0002] Due to its unique advantages, dry gas seals have been widely used in various high-speed rotating machinery, such as centrifugal compressors, expanders, fans, etc. The dry gas seal is to open various fluid dynamic and static pressure grooves on the sealing end surface. When the moving ring rotates, the gas medium is pumped into the sealing end surface by using the dynamic and static pressure effect of the groove, and the fluid medium entering the end surface is blocked from flowing at the root of the groove. Therefore, a certain opening force is generated and the end face is pushed away, so as to realize the non-contact operation of the dynamic and static rings. Among them, the most widely used end fa...

AI Technical Summary

Problems solved by technology

However, these spiral groove dry gas seals still have problems such as poor start-stop characteristics under low-speed and low-pressure or low-speed and high-pressure conditions, insufficient air film rigidity, and the ability to open the end face cannot adapt to a wider operating range. In the process, it is difficult to open quickly, the stability of low-speed operation is not good, and the sealing end face is prone to dry grinding, which makes it difficult to meet the operation requirements of mechanical seals under high-parameter conditions such as high pressure.

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