High-speed high-pressure magnetic suspension centrifugal two-stage air compressor and control method thereof

Abstract

The invention relates to a high-speed high-pressure magnetic suspension centrifugal two-stage air compressor and a control method thereof, and belongs to the technical field of air compressors. The air compressor comprises a permanent magnet driving motor, a displacement sensing assembly, a bearing controller and a variable-frequency controller. A first-stage impeller and a second-stage impeller are arranged at one end of a main shaft of the permanent magnet driving motor, and a magnetic suspension bearing assembly conducts radial supporting and axial limiting on the main shaft. A first-stage volute is arranged outside the first-stage impeller in a covering manner, and a second-stage volute is arranged outside the second-stage impeller in a covering manner. The displacement sensing assembly is used for detecting the radial and axial position deviation of the main shaft in the rotating process. The bearing controller is used for controlling the current of the magnetic suspension bearing assembly according to the main shaft displacement signal detected by the displacement sensing assembly so as to adjust the position of the main shaft in the radial direction and the axial direction. And the variable-frequency controller is used for adjusting the rotating speed, the flow and the pressure of the air compressor according to the air using demand and further performing anti-surge control. The high-speed high-pressure magnetic suspension centrifugal two-stage air compressor provided by the invention has the advantage of high operation stability under high-pressure and high-speed conditions.

Description

technical field [0001] The present application relates to the technical field of air compressors, in particular to a high-speed, high-pressure magnetic levitation centrifugal two-stage air compressor and a control method thereof. Background technique [0002] An air compressor is a device used to generate compressed air in industrial production. The output pressure capacity of the air compressor usually increases with the increase of the impeller speed. Currently, existing air compressors generally use ball bearings to support the motor shaft. [0003] Regarding the related technologies mentioned above, the inventor believes that the existing air compressor main shaft is supported by ball bearings, and the bearing life is short due to high frictional power consumption, which makes it difficult to meet the demand for continuous and stable operation under high pressure and high speed conditions. Contents of the invention [0004] In order to improve the ability of an air co...

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Problems solved by technology

[0003] In view of the related technologies mentioned above, the inventor believes that the existing air compressor main shaft is supported by ball bearings, due to high frictional power consumption, the bearing life is short, and it is difficult to meet the needs of continuous and stable operation under high pressure and high speed conditions

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