Stability extension system for vaneless diffuser of centrifugal compressor

Abstract

The invention relates to a stability extension system for a vaneless diffuser of a centrifugal compressor. According to the stability extension system, backflow channels are arranged on the inner side wall of the vaneless diffuser, wherein openings are formed in the two ends of each backflow channel, and the backflow channels are linearly distributed in the radial direction of the vaneless diffuser. The multiple backflow channels are distributed in the circumferential direction of the vaneless diffuser. Dynamic pressure sensors are further arranged in the stability extension system, distribution, in the circumferential direction of the vaneless diffuser, of the dynamic pressure sensors is consistent with the arrangement of the backflow channels, and the distribution positions, in the radial direction of the vaneless diffuser, of the dynamic pressure sensors at least include the positions of backflow inlets of the backflow channels and the positions of backflow outlets of the backflow channels. Opening and closing devices are arranged in the backflow channels. A controller can independently control the opening and closing device in any backflow channel. By means of the active intelligent regulation and control manner, under the condition that the performance and efficiency of a compressor under the design condition are not influenced, active and intelligent stability extension of the vaneless diffuser is achieved.

Description

technical field [0001] The invention belongs to the technical field of compressors, in particular to a bladeless diffuser expansion and stabilization system for a centrifugal compressor. Background technique [0002] Centrifugal compressors are widely used in petrochemical, metallurgy, air-conditioning, automobile and other fields due to their advantages such as high pressure ratio, large flow rate and simple structure. With the development of production, in recent years, higher requirements have been put forward for the stable operation and expansion technology of compressors. One of the key factors affecting the stable operating range of the compressor is the rotating stall and surge under low flow conditions. These unstable flow phenomena will deteriorate the performance of the compressor, further causing vibration and damage to the impeller and other components, resulting in shutdown or even major damage. ACCIDENT. The diffuser is the most common critical component for...

AI Technical Summary

Problems solved by technology

However, the stability expansion technology in the prior art is often aimed at the vane diffuser, and the rotating stall mechanism of the vaneless diffuser is very different from that of the vane diffuser; The structural improvement of the compressor will affect the internal flow of the compressor under the original stable working condition, resulting in a decrease in the performance and efficiency of the compressor

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