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Ultrasonic-wave dynamic sealing device and method

A sealing device and ultrasonic technology, applied in the direction of engine sealing, engine components, mechanical equipment, etc., to reduce maintenance costs, facilitate structural assembly, and reduce wear and consumption

Active Publication Date: 2018-11-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of ultrasonic dynamic sealing device and method, utilize the acoustic flow phenomenon that occurs when there is strong sound wave propagating in the medium, generate vortex in the sealing device, and then the fluid kinetic energy of the sealing gap acts on viscous resistance Lower dissipation, to achieve the purpose of reducing the leakage of the sealing device, to solve the technical defects of the traditional sealing device under extreme working conditions, and to meet the adaptability of rotating machinery to different extreme working conditions

Method used

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Embodiment

[0029] The present invention is a dynamic sealing device for rotating machines. The backing 5 is hot-pressed after being fully mixed with tungsten powder and epoxy resin. The particle size of the tungsten powder is 5 μm, and the volume fraction is 15%. The outer side of the backing 5 is connected in contact with In the T-shaped groove of the sealing groove, it is connected on the sealing sleeve 6 through the T-shaped groove; the acoustic-electric chip 9 is a rectangular PZT piezoelectric ceramic sheet, the ultrasonic frequency of the acoustic-electric chip 9 is selected at about 60 kHz, and the thickness of the acoustic-electric chip 9 is about 60 kHz. 1 / 2 wavelength when propagating in the acoustic electric chip 9;

[0030] The matching layer 3 is made of low-viscosity epoxy resin filled with alumina in a single layer, the particle size of alumina powder is 2.5 μm, and the volume fraction is 25%. The filler and the base material are cast into a thin layer by casting. 1 / 4 wave...

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Abstract

The invention discloses a ultrasonic-wave dynamic sealing device and method. The device comprises a sealing body and a sealing cover, wherein the sealing body comprises an acoustical lens, matching layers, an acoustoelectric chip tape and a backing. The acoustical lens is arranged on the periphery of a rotating shaft to be sealed, one or multiple matching layers cling to the outer side of the acoustical lens, and the acoustoelectric chip tape clings to the outer sides of the matching layers. The backing clings to the periphery of the acoustoelectric chip tape, and the outer side of the backingis connected with the sealing cover. The sealing device adopts non-contact seal, so that the wear and consumption of the sealing device is reduced. The sealing device is convenient in structural assembly, has low cost and has good adaptability under extreme working conditions.

Description

technical field [0001] The invention belongs to the technical field of sealing, in particular to a rotary mechanical dynamic sealing device and method. Background technique [0002] The research of dynamic sealing technology is of great significance in the fields of science and technology. With the development of industry, the operating environment of construction machinery has undergone profound changes, and its working conditions are becoming more and more demanding. It is moving towards extreme temperature, high corrosion, Development in the direction of high dust and micro scale. Traditional dynamic sealing technologies, such as packing seals, oil seals, labyrinth seals and mechanical seals, often fail to achieve the expected sealing effect in extreme working conditions. For example, packing seal, as a kind of contact seal, has the problem of wear and tear, and the packing needs to be replaced continuously; another example is oil film seal, whose sealing oil is greatly ...

Claims

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Application Information

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IPC IPC(8): F16J15/54
CPCF16J15/54
Inventor 高铁瑜李军杨博马晨曦曾俊雄龚建英尚伟张雄
Owner XI AN JIAOTONG UNIV
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