Big and small impeller vane impeller with non-homogeneously distributed blades along circumference and compressor machine

A non-uniform distribution, vane impeller technology, applied in mechanical equipment, non-variable pumps, machines/engines, etc., can solve problems such as shortening the service life of compressors, accidents, cracks in stator blades, etc.

Inactive Publication Date: 2008-05-07
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Because the rotor blades are evenly distributed in the circumferential direction, the exciting force generated by the wake of the wake on the downstream stator blades is also strictly periodic. When the speed and the number of rotor blades satisfy a certain relationship, the frequency of this exciting force may be different from that of the downstream stator blades. The natural vibration frequencies are similar, causing resonance and causing accidents
Even if resonance does not occur, such periodic excitation for a long time will cause cracks in the stator blades due to high-cycle fatigue problems, greatly shortening the service life of the compressor

Method used

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  • Big and small impeller vane impeller with non-homogeneously distributed blades along circumference and compressor machine
  • Big and small impeller vane impeller with non-homogeneously distributed blades along circumference and compressor machine
  • Big and small impeller vane impeller with non-homogeneously distributed blades along circumference and compressor machine

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Embodiment Construction

[0019] The large and small blade impeller with blades non-uniformly distributed along the circumferential direction of the present invention, its preferred specific embodiment is shown in Figure 2, including a plurality of large blades 2, 3, 4, and the gaps between the multiple large blades 2, 3, 4 are along the circumferential direction. Evenly distributed.

[0020] Among the multiple large blades 2, 3, 4, the distance in the circumferential direction between two adjacent large blades 2, 3 is a wide distance S2; the distance between two adjacent large blades 3, 4 is a narrow distance S1 . The distribution of the large blades along the circumference of the impeller with large and small blades may be such that the wide distance S2 and the narrow distance S1 are spaced apart from each other. Other non-uniform distribution methods are also possible.

[0021] The variation between the wide distance S2 and the narrow distance S1 may be less than or equal to 10%.

[0022] Among t...

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Abstract

The invention discloses a compressor and an impeller with big and small blades unevenly distributed along circumferential direction; wherein, the big blade of the impeller with big and small blades is unevenly distributed along circumferential direction, and the variation value of the distance in circumferential direction is equal to or less than ten percents. The invention is characterized in that: a small blade is arranged between the adjacent two big blades; the distance in circumferential direction between the small blade and the big blade near the side of the pressure surface of the small blade is equal to twenty-five percents to seventy percents of the distance in circumferential direction between the adjacent big blades. The invention has the advantages that when the rotor of the compressor is the impeller with big and small blades, the exciting force imposed on the downstream stator by the wake of the rotor blade is not periodical strictly, and the destructive influence of the downstream stator is less.

Description

technical field [0001] The invention relates to a blade type impeller and a mechanical device, in particular to a large and small blade impeller and an air compressor. Background technique [0002] Vane compressors are generally used to pressurize gas and are divided into axial flow, centrifugal and diagonal flow compressors. The gas flow mode of axial flow compressor is axial intake and axial exhaust; the flow mode of gas in centrifugal compressor is axial intake and radial exhaust; the diagonal flow compressor is axial flow and centrifugal compressor. The compromise of the machine, the axial intake, and the exhaust at a certain angle with the axial. Axial flow and diagonal flow compressors include impellers, including rotors and stators, with blades on the impellers. The structure of the blade has a great influence on the boosting capacity of the compressor. [0003] When the rotor blades of the compressor rotate, the wake generated by the flow of the airflow hits the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/30F04D29/38
Inventor 刘火星王洪伟严明陈懋章蒋浩康
Owner BEIHANG UNIV
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