Composite seal structure for valve

Abstract

The invention discloses a composite seal structure for a valve. The composite seal structure comprises an inner seal ring and an outer seal ring. The outer seal ring comprises an inner circumference face, an outer circumference face coaxial with the inner circumference face and end faces located on the two sides of the inner circumference face and the outer circumference face. The outer seal ring further comprises two outer conical faces coaxial with the inner circumference face, and the two outer conical faces are each connected with the edges of one end of the outer circumference face and one end face; and the diameter of the end faces is smaller than the diameter of the outer circumference face. According to the composite seal structure for the valve, through the outer conical face on the outer surface of the outer seal ring, the outer conical face enables the diameters at positions, located at the two ends, of the outer seal ring to be reduced. When the composite seal structure moves in a valve shell along with a valve element, on the one hand, the outer seal ring can conveniently skip over a liquid passing hole in a valve shell; and on the other hand, the contact area between the outer seal ring and the liquid passing hole can be reduced, and abrasion of the outer seal ring can be reduced, so that the seal effect of the composite seal structure can be improved, the service life of the composite seal structure can be prolonged, and finally, the performance of sealing between the valve element and the valve shell can be improved.

Description

technical field [0001] The invention belongs to the technical field of coal mine fully mechanized mining hydraulic components, in particular, the invention relates to a composite sealing structure for valves. Background technique [0002] At present, the hydraulic components used in the hydraulic circuit of the fully mechanized mining hydraulic support in coal mines, such as the manual valve group, in order to improve the sealing effect between the valve housing and the valve core, generally adopt a composite sealing structure. The composite sealing structure consists of a smaller inner inner The sealing ring and the larger outer sealing ring on the outside. Since there is a liquid passage hole on the valve housing to allow the pressure liquid to pass through, friction will occur between the liquid passage hole and the surface of the outer sealing ring, resulting in easy damage to the outer sealing ring, affecting the service life and sealing effect of the sealing structure,...

AI Technical Summary

Problems solved by technology

Since there is a liquid passage hole on the valve housing to allow the pressure liquid to pass through, friction will occur between the liquid passage hole and the surface of the outer sealing ring, resulting in easy damage to the outer sealing ring, affecting the service life and sealing effect of the sealing structure, and causing the valve fail

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