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Low-noise cooling fan for train

A cooling fan, low noise technology, applied in mechanical equipment, machine/engine, liquid fuel engine, etc., to achieve the effect of reducing eddy current noise, reducing noise pollution, and reducing the separation area of ​​the outlet section

Inactive Publication Date: 2016-11-23
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: based on the above problems, the present invention provides a low-noise cooling fan for trains

Method used

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  • Low-noise cooling fan for train
  • Low-noise cooling fan for train
  • Low-noise cooling fan for train

Examples

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Embodiment Construction

[0020] The present invention will now be further described in conjunction with specific examples, and the following examples are intended to illustrate the present invention rather than further limit the present invention.

[0021] like Figure 1~6 The shown low-noise cooling fan for trains includes a volute, an air inlet 1, an air outlet 2 and an impeller, the volute includes a side plate and a worm plate 3, the side plate includes a front side plate 4 and a rear side plate 5, and the impeller Including front disk, rear disk, wheel hub and blade 6.

[0022] There is a combined micro-perforated plate 7 in the inner gap of the side plate. The combined micro-perforated plate 7 is a plate with micro-holes of two different sizes, which form a resonant sound-absorbing body with the cavity respectively. The body 7 has a larger sound-absorbing bandwidth than a sound-absorbing body with an aperture, and has a better noise reduction effect. A supporting plate 8 for connection is prov...

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Abstract

The invention relates to a low-noise cooling fan for trains. A combined micro-perforated plate is provided in the gap inside the side plate. The combined micro-perforated plate is a plate with microholes of two different sizes. The combined micro-perforated plate and the side plate are provided with There is a support plate for connection; the back of the air inlet and the inner surface of the air outlet are provided with a thin plastic box-type sound-absorbing body, and the thin-plastic box-type sound-absorbing body is a board with convex double-cavity box-type sound-absorbing blocks evenly distributed on the surface; The leaves are perforated. The beneficial effects of the present invention are: the combination of micro-perforated plates is installed to form a resonant sound-absorbing body, and the air molecules in the perforations and the cavity generate vibration friction and consume sound energy; the walls of the thin plastic box-type sound-absorbing body will vibrate, and the During the process, part of the sound energy is converted into heat energy; blade perforation treatment reduces and suppresses the generation of vortex shedding, the separation area of ​​the outlet section of the working wheel will be reduced, the strength and size of the vortex in the wind area will be reduced, and the eddy current noise radiated by the cascade will be reduced accordingly.

Description

technical field [0001] The invention relates to a low-noise cooling fan for trains. Background technique [0002] The train cooling unit is a key component of the train traction system. It is installed in the equipment compartment under the frame of the EMU. During the operation, the cooling fan of the cooling unit will inevitably generate noise. The noise reaches a certain intensity, which will affect the interior of the vehicle and The surrounding people cause damage, which directly affects the comfort of passengers. With the progress of society and the improvement of people's living standards, the requirements for noise are becoming more and more stringent. It has become an urgent problem to use appropriate means to reduce noise. [0003] Application number CN201410432115.8 relates to a noise-reducing box-type volute for a centrifugal fan used in the cooling unit of an electric multiple unit. In order to reduce noise, a sound-absorbing layer made of a porous material is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66F04D29/30
CPCF04D29/4226F04D29/30F04D29/4206F04D29/4213F04D29/665
Inventor 张学飞邓新耿卓
Owner CHANGZHOU UNIV
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