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A casing processing structure and a compressor for improving the surge margin of a single-stage centrifugal compressor

A centrifugal compressor and casing treatment technology, applied in the field of compressors, can solve problems such as not being able to adapt to the increase in air intake volume of compressors, and achieve the effects of simple structure, easy maintenance, and improved surge margin

Active Publication Date: 2017-06-23
CHINA AVIATION POWER MACHINE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a simple structure, which can ensure the pressurization ratio and efficiency of the compressor. Case treatment structure for improving surge margin of single-stage centrifugal compressor

Method used

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  • A casing processing structure and a compressor for improving the surge margin of a single-stage centrifugal compressor
  • A casing processing structure and a compressor for improving the surge margin of a single-stage centrifugal compressor
  • A casing processing structure and a compressor for improving the surge margin of a single-stage centrifugal compressor

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Embodiment 1

[0024] Such as figure 1 As shown, for a single-stage centrifugal compressor, this embodiment provides a casing processing structure that improves its surge margin. The single-stage centrifugal compressor includes an air inlet, an impeller 5, a diffuser 4, an air outlet, and a casing, and the air-inducing casing 1 is connected with the diffuser 4 by bolts 3; figure 1 , cutting off a part of the casing along the centerline direction of the impeller to obtain figure 1 The schematic diagram of the structure is shown.

[0025] The impeller 5 is provided with many pairs of large blades and small blades, and the large blades and small blades all include blade tips, and the blade tip includes a blade tip leading edge and a blade tip throat, and the outermost edge of the blade is close to the casing inlet. The position is called the leading edge of the blade tip, and the part with the smallest cross-sectional area of ​​the blade is called the blade tip throat; the air inlet, the impe...

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Abstract

The invention provides a casing treatment structure for improving the surge margin of a single-stage centrifugal compressor, and relates to the technical field of compressors. A surge expanding through hole is arranged on a casing ingeniously, when the air inlet amount needed by the compressor is increased, part of air enters the casing from the surge expanding through hole, so that the amount of air entering the casing from an air inlet way is reduced, and the surge margin is accordingly increased. Furthermore, the direction of the surge expanding hole is set to form a certain angle with a tangent line of the inner diameter of the air guide casing, so that airflow entering the casing from the surge expanding hole is basically the same in circumferential speed direction of airflow. The casing treatment structure is simple in process, low in product cost, safe, reliable, easy to maintain and simple in structure, and the compressor surge margin can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of compressors, more specifically, to a casing processing structure for improving the surge margin of a single-stage centrifugal compressor and a compressor equipped with the structure. Background technique [0002] In large aircraft main engine starting and environmental control system bleed air, an independent small gas turbine engine is usually used as an auxiliary power unit (APU). APU includes compressor, combustor and turbine, and single-stage centrifugal compressor includes inlet, impeller, diffuser, outlet pipe and casing. The impeller includes blades, which are close to the air inlet, and the diffuser is close to the air outlet. The air inlet, impeller, diffuser, and air outlet are located in the casing. The location of the airway. The air in the external environment enters the high-speed rotating impeller from the inlet, and is thrown from the center of the impeller to the outer edge of the impel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/42F04D29/66
Inventor 何风云熊良军曹四李家俊
Owner CHINA AVIATION POWER MACHINE INST
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