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Asymmetric self-circulation processing machine box of centrifugal compressor with parabolic grooving widths

A centrifugal compressor and casing processing technology, which is applied in the direction of machines/engines, mechanical equipment, non-variable pumps, etc., can solve the problem of non-axisymmetric flow field inside the compressor, affecting flow parameters, and impeller outlet circumference. Distortion and other problems to achieve the effect of improving the stable working range and maintaining efficiency

Active Publication Date: 2010-06-30
TSINGHUA UNIV +1
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Problems solved by technology

However, the traditional processing casing structure is generally axisymmetric structure
When the compressor is in non-design working conditions, the axial asymmetry of the centrifugal compressor volute causes the circumferential distortion of the impeller outlet flow, which affects the upstream flow parameters, resulting in The internal circumferential flow parameters are non-axisymmetric
The traditional axisymmetric processing casing structure cannot consider the non-axisymmetric characteristics of the internal flow field of the compressor, so it is impossible to achieve the optimal expansion and stability effect of the processing casing in the entire circumferential direction

Method used

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  • Asymmetric self-circulation processing machine box of centrifugal compressor with parabolic grooving widths
  • Asymmetric self-circulation processing machine box of centrifugal compressor with parabolic grooving widths
  • Asymmetric self-circulation processing machine box of centrifugal compressor with parabolic grooving widths

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Embodiment Construction

[0019] The principle, structure and working process of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] The centrifugal compressor asymmetrical self-circulation processing casing with parabolic slot width contains a compressor volute, and a suction ring groove 1, a diversion ring groove 2 and a return ring groove 3 are arranged on the wall surface of the compressor volute. The above-mentioned suction ring groove, diversion ring groove and return flow ring groove form a self-circulation channel, and the width b of the suction ring groove is r It is a parabolic distribution in the circumferential direction, that is, b r =A(α·D-β·D) 2 +A 0 ,

[0021] Among them, A is a characteristic parameter of the parabola, and the value range of A is determined according to the impeller diameter D of the centrifugal compressor. α represents the circumferential angle of the suction ring groove, which is the independent variable ...

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Abstract

An asymmetric self-circulation processing machine box of a centrifugal compressor with parabolic grooving widths relates to a processing machine box of the centrifugal compressor and belongs to the technical field of impeller machineries. A self-circulation channel is formed by installing a pumping ring groove, a reflux ring groove and a flow guiding ring groove on the wall surface of a turbine shell of the compressor, the widths br values of the pumping ring groove are distributed in a parabola shape in the circumference direction to optimize the expanding stability effect of the asymmetric self-circulation processing machine box on the centrifugal compressor. By adopting the asymmetric self-circulation processing machine box of the centrifugal compressor with the parabolic grooving widths, compared with an axisymmetric self-circulation processing machine box with coincident grooving widths in the circumference direction, the stable working range of the centrifugal compressor can be greatly increased, and the efficiency remains almost unchanged.

Description

technical field [0001] The invention relates to a treatment casing of a centrifugal compressor, which belongs to the technical field of impeller machinery. It can be used in impeller machinery such as supercharger centrifugal compressors, industrial centrifugal compressors, and aviation centrifugal compressors for various purposes. Background technique [0002] Compared with the reciprocating compressor, impeller compressors such as centrifugal compressors have the advantages of high efficiency, light volume and weight, and stable operation, but their working conditions are limited. Large-scale flow separation occurs in the internal flow field of the centrifugal compressor under low-flow conditions, and unstable operation occurs, causing stall or even surge, which directly leads to a sharp drop in compressor efficiency and pressure ratio, and severely shortens the service life, even short directly damaged. Therefore, people have adopted many methods to delay the occurrence...

Claims

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Application Information

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IPC IPC(8): F04D29/42
CPCF04D29/4213F04D29/685
Inventor 郑新前杨名洋张扬军马场隆弘玉木秀明林韵
Owner TSINGHUA UNIV
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