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Non-contacting mechanical seal ring with bidirectional hydrodynamic grooves

A mechanical seal, fluid dynamic pressure technology, applied in the direction of engine seals, mechanical equipment, engine components, etc., can solve the problem of low leakage

Active Publication Date: 2016-04-13
SICHUAN SUNNY SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrodynamic pressure groove on the sealing end surface of the single-rotation sealing ring is typically characterized by a logarithmic helix or Archimedes line, and has the advantages of significant hydrodynamic pressure effect, low leakage, and good fluid film stiffness. , but limited by the geometrical characteristics of the groove, this type of groove can only be used in the case of unidirectional rotation

Method used

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  • Non-contacting mechanical seal ring with bidirectional hydrodynamic grooves
  • Non-contacting mechanical seal ring with bidirectional hydrodynamic grooves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] As shown in the figure, the non-contact mechanical seal ring with double-rotation hydrodynamic pressure grooves of the present invention, on the sealing end face with inner diameter R inner = 401.62mm and outer diameter R outer = 517.68mm, its R3 = 455.04mm The outer part is the sealing groove area 2, in which several ( figure 1 12) are the same type of fluid dynamic pressure groove structure units shown in , the interval between each fluid dynamic pressure groove structure unit is the sealing platform area 3, and the inner circumference of the sealing groove area 2 is a non-dynamic pressure groove structure Unit seal dam area 1. in:

[0031] ——Each hydrodynamic pressure groove structural unit is a “wing-shaped” structure composed of a central groove 5 and wing grooves 4, 6 of the same structure that join with it on both sides of its circumference and converge symmetrically to both sides The dynamic pressure groove group.

[0032] ——In the central groove 5, the two s...

Embodiment 2

[0038] In this example, the non-contact mechanical seal ring of the double-rotational hydrodynamic pressure groove is based on the structure of Embodiment 1, and the depth of the central groove 5 is changed from a constant depth to an arc-shaped inner wall edge 8 and a linear extension to the peripheral wall opening 9. The wedge-shaped groove, the peripheral wall opening 9 groove depth at the outer diameter is 24 microns, and the groove depth at the 8 ends of the arc-shaped inner wall is 5 microns equal to the wing groove depth. The dynamic pressure effect of the non-equal-depth wedge-shaped central groove is similar to that of Embodiment 1, but the static pressure opening effect is better, but the static pressure leakage also increases accordingly.

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Abstract

For non-contact mechanical seal rings with bidirectional hydrodynamic pressure grooves, the same form of hydrodynamic pressure groove structural units are arranged at equal intervals along the circumference on the outer side of the sealing end face; the hydrodynamic pressure groove structural units are composed of central grooves The airfoil-shaped structure is composed of the same wing grooves respectively joined to the two sides of the circumference and symmetrically extended to the two sides; the two sides and the side walls of the central groove are respectively the two radial extensions of the sealing end face, and the inner wall It is an arc concentric with the sealing end face, and the central groove opens on the peripheral wall of the sealing ring; the long sides on both sides of the wing groove and the short groove side at the converging extension end are respectively two radial extensions of the sealing end face, and the length of the two wing grooves is The side edges are respectively notch portions joined with the side walls of the central groove on the side where they are located. The hydrodynamic pressure groove structure can improve the hydrodynamic pressure effect of the seal, increase the opening force of the seal end face, increase the fluid film thickness and film stiffness between the seal end faces, reduce the leakage of the seal, simplify the processing difficulty of the groove shape, and reduce the sealing parts. Process requirements for processing and assembly.

Description

technical field [0001] The invention relates to a seal ring which can be used for the shaft end seal of various forms of compressors, expanders, pumps, reactors and other rotary machines. Background technique [0002] The non-contact mechanical seal on the fluid end face uses two relatively rotating seal rings to shear the fluid between the two rings during rotation to form a hydrodynamic pressure effect, thereby increasing the bearing capacity and rigidity of the fluid film on the end face. Finally, the sealing end face is in a stable non-contact state for a long time. Changing the groove shape of the hydrodynamic pressure groove provided on the sealing end surface is an effective and common means to enhance the hydrodynamic pressure effect of the end surface, reduce the leakage of the seal and prolong the service life of the seal. [0003] Fluid end face non-contact mechanical seals are usually divided into two categories: single rotation and double rotation. The hydrody...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/40
Inventor 陈侃黄泽沛张车宁王泽平刘小明张智
Owner SICHUAN SUNNY SEAL
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