Dry gas sealing device for bidirectional rotary internal pressure pump

Abstract

The invention discloses a dry gas sealing device for a bidirectional rotary internal pressure pump. The device comprises a rotating shaft, a shell, a sealed cavity, a static ring, a dynamic ring and an elastic element, wherein the rotating shaft penetrates through a hole of the sealed cavity; the dynamic ring is fixed on the rotating shaft through a fixing assembly; the sealing end faces of the static ring and the dynamic ring are jointed; the elastic element is positioned between the sealed cavity and a thrust ring; the thrust ring is attached to the back of the static ring; a sealing ring is arranged between the thrust ring and the static ring; a cylindrical pin is fixedly arranged on the sealed cavity; the sealed cavity is arranged in the shell; and groove groups are arranged on the sealing end face of the static ring or the dynamic ring and distributed in the circumferential direction, each groove group comprises a gas supply groove and dynamic pressure grooves, and the dynamic pressure grooves are distributed on the left and right sides of the gas supply groove. The device has the advantages of simple structure, compactness in assembly, good sealing property, strong bearing capacity, convenience in machining and manufacturing, capability of realizing bidirectional rotary sealing, wide application range and the like, and is particularly suitable for sealing various rotating shafts of solid-containing centrifugal pumps, screw pumps, rotary pumps and the like.

Description

technical field [0001] The invention relates to the technical field of mechanical seals, in particular to a dry gas seal device for bidirectional rotary internal pressure pumps. Background technique [0002] At present, there are two-way rotatable spiral groove end face seals, such as Chinese patent 98218316.X "two-row double-blade spiral groove end face seal capable of bidirectional rotation", 01102213.2 "two-way rotatable spiral groove end face seal device", US patent 5090712, etc. They all have at least one dynamic pressure groove on the sealing end faces of the rotating ring (referred to as the dynamic ring) and the sealing end face of the stationary ring (referred to as the static ring) that are attached to each other. The geometry of the dynamic pressure groove is the core technology of the above invention. When the rotating shaft of the rotating machine drives the moving ring fixed on it to rotate, due to the fluid dynamic pressure effect of the dynamic pressure groov...

AI Technical Summary

Problems solved by technology

However, the existing sealing device is only suitable for the case where the pressure on the outside of the sealing surface is higher than the pressure on the inside of the sealing surface (that is, the external pressure type), but not suitable for the situation that the pressure on the inside of the sealing surface is higher than the pressure on the outside of the sealing surface (that is, the internal pressure type).

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