Axial and radial combined sealing device and assembling method thereof

Abstract

The invention relates to a labyrinth sealing device and method for a centrifugal machine, and in particular relates to an axial and radial combined sealing device and an assembling method thereof, wherein the device comprises a rotation shaft (8) and a front end cover (4); a plurality of radial fixed seal grooves extend from the front end cover (4) to an axis, and at least one ring fixed sealing fin extends from the front end cover (4) axially; and a plurality of dynamic sealing fins (3) extend radially from the rotation shaft (8) to fix corresponding annular dynamic seal grooves (5). The method is characterized by comprising: prolonging a section of regulating ring from the tail of each dynamic sealing fin; configuring a front end cover of a half structure at the periphery of each dynamic sealing fin, moving towards the dynamic seal grooves until inserting the fixed sealing fins on the front end cover into defined positions in the cavities of the dynamic seal grooves; and pushing and pulling the regulating ring on the dynamic sealing fins to regulate to an accurate position. The sealing device simultaneously has an axial labyrinth structure and a radial labyrinth structure, which is an innovation in the field in domestic and overseas; and the seal effect among the centrifugal machine levels is improved, and the working efficiency of the centrifugal machine is improved.

Description

technical field [0001] The invention relates to a sealing device, in particular to a labyrinth sealing device for a centrifugal machine and an assembly method thereof. Background technique [0002] Labyrinth seal is the most basic form of sealing between mechanical stages and shaft ends of centrifugal separators and centrifugal compressors. According to different structural characteristics, it can be divided into four types: smooth type, zigzag type, stepped type and honeycomb type. [0003] The labyrinth seal is to set a number of annular sealing teeth arranged in sequence around the rotating shaft. A series of interception gaps and expansion cavities are formed between the teeth. Purpose. [0004] Because there is a gap between the rotor and the casing of the labyrinth seal, there is no solid contact, no lubrication is required, and thermal expansion is allowed, and it is suitable for high temperature, high pressure, and high speed frequency occasions. This sealing form i...

AI Technical Summary

Problems solved by technology

There are two ways of axial labyrinth seal and radial labyrinth seal respectively in the prior art labyrinth seal, they respectively have axial or radial seal structure and function, but the pressure between the stages of centrifugal machinery is relatively large, and only the axial labyrinth seal is used. One of the labyrinth seals and radial labyrinth seals, the sealing effect is unsatisfactory. It is hoped to continue to improve in this field. It is hoped that there will be a labyrinth seal device with both axial and radial combined sealing functions.

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