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Controllable profile vaneless diffuser for centrifugal compressor

A centrifugal compressor and diffuser technology, which is applied in the direction of machines/engines, mechanical equipment, liquid fuel engines, etc., can solve the problem that the shape of the inner wall of the diffuser cannot be adjusted according to the flow rate, etc.

Inactive Publication Date: 2007-07-11
TSINGHUA UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art, aiming at the defect that the vaneless diffuser of the existing centrifugal compressor cannot adjust the shape of the inner wall surface of the diffuser according to the flow rate, and designs a vaneless diffuser with a controllable profile of the centrifugal compressor device

Method used

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  • Controllable profile vaneless diffuser for centrifugal compressor
  • Controllable profile vaneless diffuser for centrifugal compressor

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Embodiment Construction

[0015] The specific embodiment of the present invention will be described with reference to the accompanying drawings.

[0016] As shown in Figure 1, the compressor rotating shaft 1, the impeller disc 2, the blade 3, the outer wall surface diffuser wheel cover 5, the diffuser disc 10 and the impeller baffle plate 12 are all common parts of the existing compressor, and 11 is Vaneless diffuser flow path. It is characterized in that, on the inner side wall of the diffuser wheel cover 5 on the outer wall, a flexible annular disc 9 is also installed, and the inner circumference of the flexible annular disc 9 is connected with the inner side of the diffuser wheel cover 5 on the outer wall. The walls are connected to form a junction 4, and at least two groups of radially distributed circular arc ring sheet groups are fixed on the circumferential surface of the flexible annular disk 9, and each group of circular arc ring sheet groups contains at least 3 circular arc ring sheet groups ...

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Abstract

The invention relates to a vaneless diffuser with controlled profile in centrifugal compressor, belonging to turbo-machine technology area, comprising rotating shaft of compressor, impeller disc, vane, diffuser shroud of external wall, diffuser disc and impeller baffle, characterized in that a flexible annular disc is set in the inner wall of diffuser shroud of external wall, the internal circle of said flexible annular disc is fixed with the inner side of said diffuser shroud of external wall, at least two groups of arc ring plates distributed on the radius direction are fixed in the circle face of said flexible annular disc, each group of arc ring plates comprises at least three arc ring plates distributed on the circle direction and each arc ring plated is connected with a controlled thrust mechanism. The invention can avoid flow separation inside the diffuser, improve the diffuser efficiency, expand the condition range of compressor and improve stall margin under different flux conditions, shrinkage or expansion flow channel and approached optimal profile.

Description

Technical field: [0001] A vaneless diffuser with a controllable profile of a centrifugal compressor belongs to the technical field of impeller machinery. technical background: [0002] The invention relates to the improvement of vaneless diffusers of impeller machinery such as centrifugal compressors for vehicle and marine superchargers, industrial centrifugal compressors and aviation centrifugal compressors. [0003] 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. Under the low flow condition of the centrifugal compressor, there will be large-scale flow separation in the impeller and diffuser, resulting in unstable operation, stalling or even surge, which will directly lead to a sharp drop in compressor efficiency and pressure ratio, and a serious shortening of life. , or even directly damaged in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/46
Inventor 郭宫达张扬军郑新前徐建中诸葛伟林
Owner TSINGHUA UNIV
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