An adjustable centrifugal compressor radial diffuser structure

By designing an adjustable radial diffuser structure and using guide rings and eccentric wheel mechanisms to adjust the blade inlet angle, the efficiency loss problem of centrifugal compressors under non-design conditions was solved, achieving more efficient energy conversion and flow channel consistency, optimizing rotor-stator clearance, and improving compressor performance.

CN116292414BActive Publication Date: 2026-06-09NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2023-03-02
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The radial diffuser of existing centrifugal compressors suffers severe efficiency loss under non-design conditions, and the regulating mechanism has defects that affect efficiency, such as changing the radial clearance between the rotor and stator, flow channel obstruction, or leakage.

Method used

An adjustable radial diffuser structure was designed. The radial diffuser blades and eccentric wheel mechanism are driven by a guide ring to adjust the blade inlet angle, reduce airflow leakage and maintain flow channel consistency. A double eccentric wheel mechanism is used to prevent airflow leakage and optimize the radial clearance.

Benefits of technology

It improves the efficiency of centrifugal compressors under different operating conditions, reduces airflow leakage, maintains the smoothness and efficiency of diffuser channels, optimizes the radial clearance between rotor and stator, and enhances overall performance.

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    Figure CN116292414B_ABST
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Abstract

The application provides a structure of an adjustable centrifugal compressor radial diffuser, the radial diffuser blade can adjust the geometric inlet angle through certain actuation and transmission mechanism, so as to match various working conditions of the compressor. All the blades are uniformly arranged on the radial diffuser bottom plate, the rear part of the blade is fixed by a rotating shaft and a sliding groove, the front part of the blade is connected with a rotating shaft, the rotating shaft is fixed by a guide ring below the bottom plate, when the guide ring rotates by a certain angle, the blade moves along, the inlet angle of the blade is adjustable, meanwhile, the double eccentric wheels embedded in the bottom plate and surrounding the rotating shaft of the front part of the blade move along, the small gap between the wall surfaces of the eccentric wheels can inhibit air leakage and has little influence on the smoothness of the wall surfaces.
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