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Shaft end sealing structure and method

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

Active Publication Date: 2020-04-17
DONGFANG TURBINE CO LTD
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  • 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

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  • Shaft end sealing structure and method
  • Shaft end sealing structure and method
  • Shaft end sealing structure and method

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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, one end of the gas channel 13 is a high-pressure end, and the other end is a low-pressure end;

[0045] The gas channel 13 is provided with a first seal 17 and a second seal 18 spaced apart along the axial direction 16, and the first seal 17 and the second seal 18 realize non-contact sealing to the gas channel 13 respectively; the first seal 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 Shown in is the embodiment of passing through the hot working fluid), in order to improve the specific volume of the intermediate chamber 19;

...

Embodiment 2

[0054] Cooperate see figure 2 , image 3 , Figure 5 and Image 6 , the shaft end sealing structure 10 in this embodiment is based on the first embodiment, and the third sealing member 23 is additionally arranged behind the second sealing member 18; the third sealing member 23 realizes a non-contact sealing for the gas channel 13 ; A 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 shows a schematic diagram of the shaft end sealing structure 10 when the middle chamber 19 is filled with working fluid under the condition that the high pressure end is low temperature and the low pressure end is high temperature; image 3 shows a schematic diagram of the shaft end sealing structure 10 when the middle chamber 19 ad...

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Abstract

The invention relates to the field of gas sealing, aims to solve the problems of large gas leakage and narrow application range of an existing sealing structure, and provides a shaft end sealing structure and method. An annular gas channel is arranged between a stator shell and a rotor, one end of the gas channel is a high-pressure end, and the other end of the gas channel is a low-pressure end; afirst sealing member and a second sealing member which are axially spaced are arranged in the gas channel; the first sealing member is close to the high-pressure end, and the second sealing member isclose to the low-pressure end; a middle chamber is defined between the first sealing member and the second sealing member; when the high-pressure end is at a low temperature and the low-pressure endis at a high temperature, a device capable of introducing a thermal working medium into the middle chamber or heating the working medium of the middle chamber is arranged; and when the high-pressure end is at a high temperature and the low-pressure end is at a low temperature, a device capable of introducing a cold working medium into the middle chamber or cooling the working medium of the middlechamber is arranged. The shaft end sealing structure and method have the beneficial effects that the gas leakage amount is small, and the structure and the method can be suitable for environments withlarge temperature difference at two ends.

Description

technical field [0001] The 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 ring-shaped sealing teeth arranged in sequence around the rotating shaft, and a series of cut-off gaps and 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 leak prevention. However, because there is a 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 usually artificially enlarged, resulting i...

Claims

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Application Information

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Patent Type & Authority Applications(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