Diaphragm and centrifugal rotating machine

Abstract

A diaphragm (4) covers an impeller (3) so as to be capable of rotating about an axis line (O). Formed in the diaphragm (4) are an intake flow channel (FC1) for supplying a gas (G) to an inlet of the impeller (3), a diffuser flow channel (FC4) through which gas (G) flows that has been discharged radially outward from the impeller (3), and a communication part (24) for constantly communicating the intake flow channel (FC1) and the diffuser flow channel (FC4).

Description

technical field [0001] The present invention relates to a diaphragm and a centrifugal rotary machine including the diaphragm. this application claims priority based on Japanese Patent Application No. 2014-020490 for which it applied to Japan on February 5, 2014, and uses the content here. Background technique [0002] For example, a centrifugal compressor is known as a type of centrifugal rotating machine. In a centrifugal compressor, gas is circulated in the radial direction of a rotating impeller, and the gas is compressed by centrifugal force. Among such centrifugal compressors, there is known a multistage centrifugal compressor that includes multistage impellers in the axial direction and compresses gas in stages. [0003] However, it is known that in the above-mentioned multi-stage centrifugal compressor, a phenomenon called surge occurs in which gas flows backward from the downstream side toward the upstream side in the impeller. When the flow rate of the system as ...

AI Technical Summary

Problems solved by technology

Therefore, although it is a state where surge does not occur, it is very close to a state where surge occurs, so the flow becomes unstable and shaft vibration may occur

In addition, in the bypass passage of Patent Document 1, a structure such as a spring for opening and closing the bypass passage is provided, so the pressure loss when the fluid flows into the bypass passage increases, and there is a problem that the compression efficiency decreases.

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