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Internally circulating device of centrifugal air compressor

A compressor and internal circulation technology, which is applied to parts of pumping devices for elastic fluids, mechanical equipment, non-variable pumps, etc., can solve problems that cannot meet wide matching conditions and surge margins and restrictions Problems such as the range of turbocharger matching working conditions, etc., to achieve the effect of increasing the pressure surge margin and increasing the gas flow range

Inactive Publication Date: 2013-03-27
CRRC DALIAN INST CO LTD
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  • Abstract
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  • 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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  • Internally circulating device of centrifugal air compressor

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Embodiment Construction

[0016] like figure 1 As shown, a centrifugal compressor internal circulation device includes an impeller casing 2 fixed on the outside of the impeller 3 and an intake elbow 4 fixed to the front end of the impeller casing 2. Between the impeller casing 2 and the The inner wall formed by the intake elbow 4 is provided with a return fluid 1, and a flow channel 5 is formed between the return fluid 1 and the inner wall for gas circulation and improved surge margin. The flow channel 5 The two ends of the opening 51 and the throat 52 are respectively formed with the inner wall.

[0017] The central position of the throat 52 is flush with the central position of the inlet throat of the impeller 3 along the meridional flow path; the opening 51 is arranged at the front end of the impeller 3, and the central position of the opening 51 is a distance from the The vertical distance at the front end of the impeller 3 is 0.125-0.25 times the diameter of the impeller.

[0018] The area of ​​...

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Abstract

The invention discloses an internally circulating device of a centrifugal air compressor, which comprises an impeller cover and an air inlet elbow, wherein the impeller cover is fixed at the outer side of an impeller; and the air inlet elbow is fixed with the front end of the impeller cover. The internally circulating device of the centrifugal air compressor is characterized in that an inner wall formed by the impeller cover and the air inlet elbow is provided with a reflux body; a flow channel which can be used for circulate air and enhance surge margin is formed between the reflux body and the inner wall; and both ends of the flow channel respectively form an opening and a throat opening with the inner wall. The internally circulating device disclosed by the invention ensures the smooth transition, monotonousness area change and no saltation of the flow channel design from the opening to the throat opening, less influences the use efficiency of the centrifugal air compressor and can greatly enhance the surge margin of the centrifugal air compressor and enlarge 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. Specifically, it is 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 optimal matching efficiency within the full operating range, which will also make the turbocharger operate close to the surge line. This also limits the range of matching working conditions of the turbocharger. Simply using traditional design to adjust the compressor performance curve of the turbocharger can no longer meet the wide range of matching operating conditions and surge margin requirements. Therefore, designing a device that improves the surge margin of the centrifugal compressor and expands the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/28
CPCF04D29/685F04D29/4213
Inventor 张博么克东高博
Owner CRRC DALIAN INST CO LTD