Unlock instant, AI-driven research and patent intelligence for your innovation.

Shaft end seal structure and method

A shaft end seal and seal technology, which is applied in the field of shaft end seal structure, can solve the problems of large gas leakage and narrow application range.

Active Publication Date: 2022-06-21
DONGFANG TURBINE CO LTD
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to provide a shaft end sealing structure and method to solve the problems of large gas leakage and / or narrow application range of existing sealing structures

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Shaft end seal structure and method
  • Shaft end seal structure and method
  • Shaft end seal structure and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] See figure 1 , Figure 4 , this embodiment provides a shaft end sealing structure 10, an annular gas channel 13 is provided between the stator housing 11 and the rotor 12, and one end of the gas channel 13 is a high-pressure end and the other end is a low-pressure end;

[0045] A first sealing member 17 and a second sealing member 18 spaced along the axial direction 16 are arranged in the gas channel 13, and the first sealing member 17 and the second sealing member 18 respectively realize non-contact sealing to the gas channel 13; the first sealing member 17 is close to the high pressure end, and the second seal 18 is close to the low pressure end; an intermediate chamber 19 is defined between the first seal 17 and the second seal 18;

[0046] For the case where the high pressure end is low temperature and the low pressure end is high temperature, a device 20 ( figure 1 It is shown in the embodiment that the hot working medium is introduced), in order to increase the ...

Embodiment 2

[0054] See also figure 2 , image 3 , Figure 5 and Image 6 , the shaft end sealing structure 10 in this embodiment is a third sealing member 23 additionally disposed after the second sealing member 18 on the basis of the first embodiment; the third sealing member 23 realizes non-contact sealing to the gas channel 13 The rear chamber 24 is defined between the third sealing member 23 and the second sealing member 18 ; As shown in the figure, an air extraction port is provided on the stator housing 11 to extract the working fluid from the rear chamber 24 through an external air extraction device (not shown). specifically, figure 2 The schematic diagram of the shaft end sealing structure 10 when the middle chamber 19 adopts the scheme of filling the working medium is shown in the case where the high pressure end is low temperature and the low pressure end is high temperature; image 3 A schematic diagram of the shaft end sealing structure 10 is shown in the case where the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of gas sealing, aims to solve the problems of large gas leakage and narrow application range of existing sealing structures, and provides a shaft end sealing structure and method. There is an annular gas channel between the stator housing and the rotor, one end of the gas channel is a high-pressure end, and the other end is a low-pressure end; the gas channel is provided with a first seal and a second seal spaced along the axial direction; the first seal Close to the high-pressure end, the second seal is close to the low-pressure end; an intermediate chamber is defined between the first seal and the second seal; for the case where the high-pressure end is low temperature and the low-pressure end is high temperature, heat can be introduced into the intermediate chamber. Working fluid in the middle chamber or a heating device for the working fluid in the middle chamber; for the case where the high-pressure end is high temperature and the low-pressure end is low temperature, a cold working fluid can be introduced into the middle chamber or the working fluid in the middle chamber can be cooled. device. The beneficial effect of the invention is that the amount of gas leakage is small and it can be applied to an environment with a large temperature difference between two ends.

Description

technical field [0001] The present invention relates to the field of gas sealing, in particular, to a shaft end sealing structure and method. Background technique [0002] Conventional seals include the following forms, such as labyrinth seals, carbon ring seals or dry gas seals. Among them, the labyrinth seal, also known as the comb seal, is the most basic form of sealing between the stages and the shaft end of the centrifugal compressor. There are several annular sealing teeth arranged in sequence around the rotating shaft, and a series of interception gaps are formed between the teeth. In the expansion cavity, the sealed medium produces a throttling effect when passing through the gap of the tortuous labyrinth to achieve the purpose of preventing leakage. However, due to the gap between the air seal teeth and the rotor, the amount of air leakage is related to the size of the gap. In order to ensure safe operation, the gap is often artificially expanded, resulting in a la...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/34F16J15/40
CPCF16J15/34F16J15/40
Inventor 廖健鑫田瑞青王文武张粉周勇陈付廖翔
Owner DONGFANG TURBINE CO LTD