Nonlinear sound elimination method and sound eliminator for high-power double-blade countercurrent cooling type Roots vacuum pump

A Roots vacuum pump and counter-flow cooling technology, applied in the field of acoustics, can solve the problems of low noise reduction, strong structural vibration of the muffler, etc., and achieve the effect of reducing fundamental frequency noise

Active Publication Date: 2013-09-04
BAOSHAN IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, with traditional resistant mufflers, the noise reduction is much lower than the theoretical value, and at the same time, strong structural vibrations will occur in the muffler

Method used

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  • Nonlinear sound elimination method and sound eliminator for high-power double-blade countercurrent cooling type Roots vacuum pump
  • Nonlinear sound elimination method and sound eliminator for high-power double-blade countercurrent cooling type Roots vacuum pump
  • Nonlinear sound elimination method and sound eliminator for high-power double-blade countercurrent cooling type Roots vacuum pump

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Embodiment Construction

[0043] see figure 1 , figure 2 , the non-linear noise reduction method of the high-power double-leaf counter-flow cooling Roots vacuum pump of the present invention comprises the following steps:

[0044] Step 101, eddy current buffering and pressure balancing

[0045] For the pulsating turbulence caused by a pressure difference close to an atmosphere, the balance chamber with a volume of 91332cm3 stabilizes the pressure, reduces the pressure difference and flow velocity, and realizes the linearization of the acoustic wave process. The purpose of making the linear anechoic unit effective attenuation.

[0046] When the Roots vacuum pump is working, it will be 3460cm 3 In the negative pressure space (lower than one atmospheric pressure), within 0.843ms, the balance chamber is connected according to the law of Asin30t, then the chamber door is closed, and the chamber door is opened again, and so on.

[0047] During the opening and closing process of the chamber door, the med...

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Abstract

The invention relates to a nonlinear sound elimination method and sound eliminator for a high-power double-vane countercurrent cooling type Roots vacuum pump. Aiming at a nonlinear high and strong sound source, linearization treatment is adopted; firstly, one part of energy of low-frequency sound is raised to a high-frequency band; then, sound energy is attenuated in an impedance composite way; and finally, sound elimination units are reasonably matched, so that the optimal sound elimination effect is achieved. In the invention, the corresponding nonlinear sound eliminator is additionally provided under the condition of not changing the structure of the Roots vacuum pump, therefore, the base-frequency noise of the high-power double-vane countercurrent cooling type Roots vacuum pump is reduced.

Description

technical field [0001] The invention relates to the field of acoustics, in particular to a nonlinear noise elimination method and a silencer of a high-power double-leaf counterflow cooling type Roots vacuum pump. Background technique [0002] In view of the working characteristics of the two-impeller volumetric Roots vacuum pump, it is called a "sound tiger" in the industry. It produces a lot of noise radiation during operation, so it produces considerable noise during operation, especially when the vacuum pump is in operation. The aerodynamic noise is dull, has a long transmission distance and strong penetrating power, which seriously deteriorates labor production conditions, pollutes the working environment, and has a great impact and harm on the physical and mental health of operators. But at present in industrial production, Roots vacuum pump (fan) is the main form of fan, and its market retention is very large, so the noise pollution is also very serious. Based on the ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): F04C29/06
Inventor孔利明程俊峰姜峰陈世梁郑琦李守成季振宇陆正湘阳东方
OwnerBAOSHAN IRON & STEEL CO LTD