Mechanical sealing structure of gas lubricating end face with human pyramid-like combined groove deep grooves

A technology of end face mechanical seal and sealing structure, which is applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of insufficient air film stiffness, high air film stiffness, and low leakage rate, etc., to reduce the eddy current effect and improve Effect of bearing capacity and air film stiffness, strong pumping action

Active Publication Date: 2015-09-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the problems of high leakage rate and insufficient gas film stiffness when the dry gas seal operates under high-speed and high-pressure conditions, and provides a fluid dynamic p

Method used

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  • Mechanical sealing structure of gas lubricating end face with human pyramid-like combined groove deep grooves
  • Mechanical sealing structure of gas lubricating end face with human pyramid-like combined groove deep grooves
  • Mechanical sealing structure of gas lubricating end face with human pyramid-like combined groove deep grooves

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example one

[0033] See figure 1 , figure 2 with image 3 , A gas-lubricated end face mechanical seal structure of a composite groove-like deep groove, comprising a moving ring and a static ring of a mechanical seal. One side of the end face of the moving ring or the static ring is the high pressure side, that is, the upstream, the moving ring or the static ring The other side of the ring end surface is the low pressure side, that is, the downstream, which is characterized in that: the end surface of at least one of the moving ring and the static ring is provided with a plurality of deep grooves that are evenly distributed in the circumferential direction. The deep groove of the compound groove-like compound groove is composed of a basic dynamic pressure groove 4 and a arhat-like groove 1, the basic dynamic pressure groove 4 is opened upstream of the end surface, and the bottom surface of the basic dynamic pressure groove 4 is machined with a arhat-like groove The width...

Example Embodiment

[0039] Example two

[0040] Reference Figure 5 with Image 6 The difference between this embodiment and the first embodiment is that in the above-mentioned arhat-like groove, the sub-groove on the downstream side and the sub-groove on both sides of the sealing weir on the upstream side that it straddles are separated from the foundation The dynamic pressure grooves are separated by fan-shaped sealing weirs of equal depth.

[0041] Each sub-slot 11, 13, 15 in the upstream row and each sub-slot 21, 23 in the adjacent downstream row are separated by a sealing dam 42 having the same depth as the basic dynamic pressure groove 4, and each sub-slot 21, 23 in the middle row is adjacent to The downstream row sub-tanks 3 are separated by a sealing dam 41 having the same depth as the basic dynamic pressure tank 4, and the remaining structure and implementation are the same as the first embodiment.

Example Embodiment

[0042] Example three

[0043] Reference Figure 7 with Figure 8 The difference between this embodiment and the first embodiment is that each of the sub-slots 21 and 23 in the middle row are respectively embedded between the adjacent upstream row sub-slots 11 and 13 and 13 and 15, while the downstream row sub-slot 3 It is embedded between the sub-slots 21 and 23 in the middle row, and the remaining structure and implementation are the same as the first embodiment.

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Abstract

A mechanical sealing structure of a gas lubricating end face with human pyramid-like combined groove deep grooves comprises a moving ring and a static ring which are in mechanical seal. The end face of at least one seal ring between the moving ring and the static ring is provided with a plurality of human pyramid-like combined groove deep grooves spirally evenly distributed in the circumferential direction, and the human pyramid-like combined groove deep grooves are gradually narrowed from the upstream part to the downstream part. The human pyramid-like combined groove deep grooves are composed of basic dynamic pressure grooves and human pyramid-like grooves. The bottom surfaces of the basic dynamic pressure grooves are provided with the human pyramid-like grooves, and the depths of the human pyramid-like grooves become shallow gradually from the upstream part to the downstream part. The human pyramid-like grooves are formed by splicing multiple rows of sub-grooves, the adjacent sub-grooves on the same row are separated through sealing weirs with the depths equal to that of the basic dynamic pressure grooves, the sub-grooves on one downstream side stride over the sealing weirs between two sub-grooves of adjacent rows on the upstream side and are communicated with the sub-grooves on the two sides of the sealing weirs on the upstream side, and a sealing dam is arranged on the downstream part of the end face.

Description

technical field [0001] The invention relates to a fluid dynamic pressure type gas lubrication end face mechanical seal structure of a rotary fluid machine, in particular to a composite groove deep end face seal structure containing a basic dynamic pressure groove and a superimposed Arhat-like groove, which is suitable for various compressors, Gas film end face seal at the shaft end of rotating machinery such as fans, pumps and reactors. Background technique [0002] Since the development of dry gas seals in the 1960s, they have been widely used in medium and high-speed rotating machinery such as centrifugal compressors and fans due to their unique performance advantages. The dry gas seal is to open a dynamic pressure groove with a spiral, straight line or arc line on the sealing end surface. When the dynamic ring rotates, the gas medium is pumped into the sealing end surface by using the strong dynamic and static pressure effect of the dynamic pressure groove. The gas enter...

Claims

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Application Information

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IPC IPC(8): F16J15/34F16J15/54
CPCF16J15/164F16J15/40F16J15/3412
Inventor 彭旭东江锦波孟祥铠白少先李纪云
Owner ZHEJIANG UNIV OF TECH
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