Centrifugal compressor and passive anti-surge device of volute thereof

Abstract

The invention discloses a passive anti-surge device of a volute of a centrifugal compressor. The device comprises a volute and a piston assembly. A ring casing circulation hole, a gas collecting ringcasing and a pre-rotating hole sequentially communicating are formed in the volute, and the pre-rotating hole communicates to an impeller inlet; the piston assembly comprises a housing and a piston connected to the housing through an elastic part; the housing is mounted on the volute and is provided with an inner channel; the piston is arranged in the inner channel, and the inner channel on two sides of the piston separately communicates to an outlet gas supplementing bypass pipeline of the compressor and the ring casing circulation hole; in the process that the piston moves in the inner channel, the inner channel can be closed and conducted; the piston is driven by action force formed by pressure difference between two sides of the piston or an action force applied by the elastic part tomove in the inner channel automatically. By joint action of the pressure difference between two sides of the piston and the elastic force of the elastic part, the device controls the communication condition of the outlet gas supplementing bypass pipeline of the compressor and the impeller inlet automatically, so that an active control feedback system is eliminated. The invention discloses the centrifugal compressor.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 202010657041.3 and the title of the invention "centrifugal compressor and its volute passive anti-surge device" submitted to the China Patent Office on July 09, 2020, the entire content of which is incorporated by reference incorporated in this application. technical field [0002] The invention relates to the technical field of centrifugal fuel cell air compressors, more specifically, to a passive anti-surge device for a volute of a centrifugal compressor, and also to a centrifugal compressor. Background technique [0003] At present, for the surge problem of the centrifugal fuel cell compressor at the idling point of small flow rate and low pressure ratio, the traditional method is adopted to solve the problem: bleed air from the compressor outlet into the first stage inlet to prevent surge. This transmission method needs to be equipped with a redundant active control ...

AI Technical Summary

Problems solved by technology

This transmission method needs to be equipped with a redundant active control feedback system, and the active control feedback system has a complex structure.

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