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Low-noise centrifugal fan impeller for high-speed electric multiple unit cooling system

A cooling system and centrifugal fan technology, applied in engine manufacturing, machine/engine, liquid fuel engine, etc., can solve the problem of high noise in the cooling system, and achieve the effects of high cooling efficiency, reliable operation and high strength

Inactive Publication Date: 2015-03-25
CHINA RAILWAYS CORPORATION +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of high noise in the cooling system of high-speed electric multiple units, the present invention develops a low-noise, high-efficiency centrifugal fan impeller

Method used

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  • Low-noise centrifugal fan impeller for high-speed electric multiple unit cooling system
  • Low-noise centrifugal fan impeller for high-speed electric multiple unit cooling system
  • Low-noise centrifugal fan impeller for high-speed electric multiple unit cooling system

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Embodiment Construction

[0019] The reasons for the aerodynamic noise of the centrifugal impeller mainly include the following aspects: (1) the interaction between the unstable flow of the airflow at the inlet of the fan impeller and the impeller; (2) the separation of the airflow in the flow channel on the blade interface to generate vortices, Vortex separation produces vortex shedding noise; (3) the sudden diffusion of airflow at the outlet of the impeller airflow causes the airflow to be sparse and generates noise; (4) the noise generated by the interaction between the high-speed airflow and the casing.

[0020] Combine below Figure 1 ~ Figure 4 The embodiment illustrates the structure of the present invention and its principle of noise reduction. The low-noise centrifugal fan impeller for the cooling system of high-speed electric multiple units in the present invention includes: a front disk 1, a rear disk 3 and a blade 2 sandwiched between the front disk 1 and the rear disk 3, the air flow flows...

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Abstract

The invention discloses a low-noise centrifugal fan impeller for a high-speed electric multiple unit cooling system. The low-noise centrifugal fan impeller comprises a front disc, a rear disc and blades clamped between the front disc and the rear disc. The blades are provided with air inlet ends, air outlet ends, front side faces and rear side faces. The distance between the blades and the front disc and between the blades and the rear disc is b, the air outlet ends are of a zigzag structure, the tooth height h is b / 8-b / 10, and the tooth pitch t is b / 12-b / 14. The front side faces and the front disc are fixed in a full welding mode, and the rear side faces and the rear disc are fixed in a full welding mode. The air outlets of the low-noise centrifugal fan impeller are designed to be of the zigzag structure, the tooth height and the tooth pitch are reasonable, the noise of a centrifugal fan is greatly lowered, and the efficiency of the centrifugal fan is improved.

Description

technical field [0001] One aspect of the present invention relates to the field of ventilation and cooling systems, in particular to a low-noise centrifugal fan impeller for cooling systems of high-speed electric train units. Background technique [0002] With the development of China's high-speed rail technology, not only the operating speed of high-speed electric trains is required to be higher and higher, but also its comfort has received more and more attention and higher requirements. The noise of the cooling system is the most important factor affecting high-speed electric trains. A factor of comfort, therefore, there is an urgent need for a low-noise, high-efficiency centrifugal fan impeller for cooling systems of high-speed EMUs. The noise generated during the operation of the centrifugal fan mainly includes two parts: aerodynamic noise and mechanical noise. Among them, the intensity of the aerodynamic noise is high, which is an important factor to be considered when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/28F04D29/30F04D29/66
CPCF04D29/281F04D29/023F04D29/30F04D29/667F05D2220/80F05D2250/182F05D2300/171
Inventor 包明冬包健辉王林芳
Owner CHINA RAILWAYS CORPORATION
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