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Inner circulating device of centrifugal gas compressor

A compressor and internal circulation technology, which is applied to the components of the pumping device for elastic fluids, mechanical equipment, non-variable-capacity pumps, etc. The matching operating conditions and surge margins can achieve the effect of increasing the pressure surge margin and increasing the gas flow range.

Inactive Publication Date: 2013-09-04
CHINA RAILWAYS CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in order to meet the requirements of diesel engines to reduce emissions and increase single-cylinder power density, the turbocharger must meet the best matching efficiency in the full range of operating conditions, which will also make the turbocharger operate close to the surge line. This also limits the range of turbocharger matching conditions
Simply using the traditional design to adjust the compressor performance curve of the turbocharger can no longer meet the requirements of wide matching conditions and surge margin

Method used

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  • Inner circulating device of centrifugal gas compressor

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Effect test

Embodiment 1

[0022] A centrifugal compressor internal circulation device, the diameter of the impeller 3 is 280mm, and the throat area of ​​the impeller 3 is 134.967cm 2 , The area of ​​throat 52 is 19.458cm 2 , Which is 14.4% of the area of ​​the throat of the impeller 3; the center of the opening 51 is 49.56mm from the air inlet of the compressor impeller 3 blades, accounting for 0.177 of the diameter of the impeller 3; the area of ​​the opening 51 is 51.174cm 2 , Which is 2.63 times the area of ​​the throat 52. Compared with the existing device, the surge margin of the compressor is increased by 14%, and the efficiency area of ​​the compressor above 80% is correspondingly enlarged.

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Abstract

The invention discloses an inner circulating device of a centrifugal gas compressor. The inner circulating device of the centrifugal gas compressor comprises an impeller housing fixed at the outer side of an impeller, and an air inlet bending pipe fixed with the front end of the impeller housing, and is characterized in that a backflow body is arranged on the inner wall formed by the impeller housing and the air inlet bending pipe, a flowing channel capable of permitting circulation of gas and improving surge margin is formed between the backflow body and the inner wall, one end of the flowing channel and the inner wall form an opening, and the other end of the flowing channel and the inner wall form an throat port. The flow channel from the opening to the throat port is designed to guarantee smooth transition and monotonous variation of size, and avoids abrupt variation. The inner circulating device of the centrifugal gas compressor has little influence on the use efficiency of the centrifugal gas compressor, can largely improve the surge margin of the gas compressor, and increases the gas flow range by about 14%.

Description

Technical field [0001] The invention relates to an internal circulation device that improves the surge margin of a centrifugal compressor and expands the matching working condition range of a turbocharger, in particular to an internal circulation device of a centrifugal compressor. Background technique [0002] At present, in order to meet the requirements of diesel engines to reduce emissions and increase single-cylinder power density, the turbocharger must meet the best matching efficiency in the full range of working conditions, which will also make the turbocharger run close to the surge line. This also limits the scope of matching operating conditions of the turbocharger. Using traditional design alone to adjust the compressor performance curve of the turbocharger can no longer meet the requirements of broad matching working conditions and surge margin. Therefore, designing a device that improves the surge margin of the centrifugal compressor on the basis of the existing im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/50
CPCF04D29/4213F04D29/685
Inventor 张博么克东高博
Owner CHINA RAILWAYS CORPORATION