Labyrinth sealing structure

A labyrinth sealing and sealing tooth technology, applied in the field of compressor sealing, can solve the problems of environmental pollution, interstage and shaft end leakage, and reducing the working efficiency of the compressor.

Pending Publication Date: 2021-04-09
SHENYANG SITE MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In order to obtain a good operation effect of the centrifugal compressor, a certain gap must be reserved between the rotor and the stator to avoid friction and wear, collision damage and other failures. At the same time, the existence of the gap will naturally cause leakage between stages and shaft ends. Leakage not only reduces the working efficiency of the compressor but also causes environmental pollution and even fire and explosion accidents

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] The smooth labyrinth seal in Example 1 adopts an overall structure, the teeth are arranged at equal intervals, the height of the sealing teeth is 3.5 mm, the distance between the teeth and the center line of the teeth is 4 mm, the angle between the two sealing teeth is 30 degrees, and the material is LD10. Aluminum, used for interstage seals before and after the impeller, can choose 4 teeth.

Embodiment 2

[0025] In the staggered labyrinth seal of Example 2, the protruding heights of the sealing teeth are different, the high and low teeth are arranged alternately, the height of the sealing teeth is 4 mm, the distance between the teeth and the center line of the teeth is 4.5 mm, and the angle between the two sealing teeth is 30 degrees. , the surface of the shaft is a special concave-convex groove. This structure of high and low teeth matched with the concave-convex groove makes the smooth sealing gap into a zigzag type, which increases the flow resistance and improves the sealing performance. It is used in the selection of materials for ethylene compressors. 5083 low-temperature aluminum, used for interstage seals before and after the impeller, and 5 teeth can be selected.

Embodiment 3

[0027] The stepped labyrinth seal in Example 3 has a change in the radial dimension, the drop between the previous tooth top and the next tooth top is 1 mm, the sealing tooth height is 5 mm, and the distance between the teeth and the center line of the tooth is 5 mm. The angle between the two sealing teeth is 30 degrees, and the material is ZL104 aluminum, which is used for shaft end sealing, and 25 teeth can be selected.

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Abstract

The invention relates to a labyrinth sealing structure which mainly comprises a stator group composed of a machine shell and a partition plate, a rotating shaft, an impeller, a sealing assembly mounted between the shell and the rotating shaft and the like. The labyrinth sealing structure is characterized in that (1) sealing teeth which are sequentially arranged at intervals are arranged on the rotating shaft; (2) a matching groove is formed in the partition plate in the stator group, and the sealing assembly is directly connected with the matching groove or connected with the matching groove through a bolt in a holding manner; (3) the height of the sealing teeth is 3.5 mm-5 mm, the distance between the center lines of the teeth is 4 mm-5 mm, and the included angle between every two sealing teeth is 30 degrees; and (4) the structural forms of the sealing teeth at an impeller opening ring are different, and the sealing positions and the sealing teeth number can also be different, wherein the sealing teeth number is generally 4-25.

Description

technical field [0001] The invention relates to the technical field of compressor sealing, in particular to a labyrinth sealing structure. Background technique [0002] In order to obtain a good operation effect of the centrifugal compressor, a certain gap must be reserved between the rotor and the stator to avoid friction and wear, collision damage and other failures. At the same time, the existence of the gap will naturally cause leakage between stages and shaft ends. Leakage not only reduces the working efficiency of the compressor but also causes accidents such as environmental pollution and even fire and explosion. [0003] Sealing is an effective measure to avoid leakage between compressor stages and shaft ends under the premise of maintaining a proper gap between the rotor and the stator. In compressors, steam turbines and fluid machinery, there have been labyrinth sealing structures, among which Chinese patent 201210268646.9 reported "Labyrinth Sealing Structure Use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/10F04D29/16
CPCF04D29/102F04D29/162
Inventor 孙忠良田继发田家东
Owner SHENYANG SITE MACHINERY MFG
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