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Online adjustable closing force gas lubricating mechanical sealing device

A mechanical sealing device and gas lubrication technology, which is applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of excessive leakage, excessive thickness of end film, contact friction and wear, etc., to avoid direct contact friction and wear, Effects of improving service life and reliability and reducing seal closing force

Active Publication Date: 2015-09-09
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the disadvantages in the prior art of dry gas sealing that contact friction and wear are prone to occur during the start-stop stage of the sealing end face, and that the end film thickness is too large in the middle and high-speed operation stage, resulting in excessive leakage, and the closure force cannot be adjusted on-line, and The control system or sealing structure of the existing controllable seal opening force or closing force is relatively complicated, which is not conducive to the popularization and application of dry gas seals for rotating machinery. A simple structure and online adjustable seal closing force are proposed. Gas Lubricated Mechanical Seals

Method used

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  • Online adjustable closing force gas lubricating mechanical sealing device
  • Online adjustable closing force gas lubricating mechanical sealing device
  • Online adjustable closing force gas lubricating mechanical sealing device

Examples

Experimental program
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Effect test

Embodiment 1

[0032] refer to figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 :

[0033]A gas lubricated mechanical seal device with online adjustable closing force, comprising a moving ring axial positioning ring 1, a sealing end cover 2, a moving ring seat 3, a piston 4, a working spring 7, a piston limit ring 8, a push ring 9, The static ring 10, the moving ring 11 and the sealing cavity 12, the moving ring 11 is fixed on the moving ring seat 3 and rotates with the shaft, the static ring 10 is installed on the sealing end cover 2; the sealing end cover 2 A piston chamber 15 is provided inside; an external gas supply channel 14 is opened on the sealing end cover 2, and communicates with the piston chamber 15 on one side of the piston 4; a working spring is provided between the other side of the piston 4 and the static ring 10 7. The piston 4 moves axially along the piston cavity 15 to change the compression amount of the working spring 7;

[0034] The compression amount of...

Embodiment 2

[0044] refer to figure 1 , 2 , 3, 4, 6, the difference between this embodiment and the first embodiment is that the working spring 7 is a large spring, and the rest of the structure and implementation are the same as the first embodiment.

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Abstract

Provided is an online adjustable closing force gas lubricating mechanical sealing device. The online adjustable closing force gas lubricating mechanical sealing device comprises an axial moving ring positioning ring, a sealing end cover, a moving ring seat, a piston, a working spring, a piston limiting ring, a pushing ring, a static ring, a moving ring and a sealing cavity. The moving ring is fixed to the moving ring seat and rotates along with a shaft. The static ring is arranged on the sealing end cover. A piston cavity is arranged inside the sealing end cover. The sealing end cover is provided with an outer gas supplying channel, and the sealing end cover is communicated with one side of the piston cavity. The working spring is arranged between the other side of the piston and the static ring. The piston moves along the piston cavity in the axial direction to change the compression amount of the working spring. The other side of the piston is exposed inside the sealing cavity. The sealing cavity is communicated with a buffer gas channel. By adjusting the outer gas supplying pressure, the compression amount of the working spring can be adjusted, and therefore online adjusting on the sealing closing force can be achieved.

Description

technical field [0001] The invention relates to a shaft end seal of a rotating machine, in particular to a gas lubricated mechanical seal with an online adjustable sealing closing force, which can be used for the shaft end seal of various compressors, fans, centrifugal pumps and other medium and high speed rotating machines. Background technique [0002] Gas-lubricated non-contact mechanical seals (also known as "dry gas seals") are widely used in centrifugal compressors, fans, and centrifugal pumps due to their low frictional power consumption, stable and reliable performance, simple auxiliary systems, and long service life. It is widely used in medium and high speed rotating machinery. The dry gas seal sets various shapes of fluid dynamic and static pressure grooves on the sealing end face. When the moving ring rotates, the gas medium is pumped into the sealing end face by using the dynamic and static pressure effect of the groove to generate a certain opening force and pu...

Claims

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Application Information

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IPC IPC(8): F16J15/54
CPCF16J15/54
Inventor 彭旭东江锦波白少先李纪云
Owner ZHEJIANG UNIV OF TECH
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