Centrifugal compressor and its volute passive anti-surge device

Abstract

The invention discloses a passive anti-surge device for a volute of a centrifugal compressor, which comprises a volute and a piston assembly; the volute is provided with an annular chamber passage hole, a gas collection annular chamber and a pre-rotation hole in sequence, and the pre-rotation hole is connected with the impeller. The inlet is connected; the piston assembly includes a casing and a piston connected to the casing through an elastic member; the casing is installed on the volute and has an internal channel; the piston is arranged in the internal channel, and the internal channels on both sides of the piston are respectively supplied with the outlet of the compressor The bypass pipeline communicates with the flow hole of the annular chamber; the piston can close and conduct the internal passage during the process of moving in the internal passage; wherein, the piston is subjected to the force formed by the pressure difference on both sides of the piston or the force exerted by the elastic member Driven by force to move automatically in the internal channel. The device uses the pressure difference on both sides of the piston and the elastic force of the elastic member to act simultaneously to automatically control the connection between the air supply bypass pipeline at the outlet of the compressor and the inlet of the impeller, eliminating the need for an active control feedback system. The invention discloses a centrifugal compressor machine.

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.

Images