Suction pipe structure of centrifugal fluid machinery

Abstract

The purpose of the present invention is to provide a kind of fluid that guides the impeller without using a mechanical unit. When the flow is large, the fluid is reversely swirled to increase the pressure ratio, and when the flow is small, it is swirled forward to avoid surge, and can ensure a large flow rate. The suction pipe structure of the centrifugal fluid machine in the working range, the suction pipe structure (10) is in the centrifugal fluid machine (1) having the impeller (12) installed on the rotating shaft and the housing (4) containing the impeller (12), A fluid (f) for flowing in a direction approximately perpendicular to the rotation axis (3) is accommodated in the casing (4) through the suction pipe portion (4a) of the casing (4) protruding in the axial direction of the rotation axis (4). The center of rotation (12a) of the impeller (12) of ) guides the flow, wherein it has an inflow portion (14) extending in a direction substantially perpendicular to the rotation axis (3) and connecting the inflow portion (14) to the casing (4) The transition part (16) connected to the suction pipe part (4a) of the , there is an imaginary plane (20) as follows, the imaginary plane (20) is perpendicular to the axis of rotation (3) and the flow through the inflow part (14) road section, and the intersection point (22) of the imaginary plane (20) and the rotation axis (3) is located inside the transition portion (16).

Description

technical field [0001] The present invention relates to a suction pipe structure of a centrifugal compressor, a mixed flow compressor, a centrifugal blower, and a mixed flow blower (hereinafter, they are collectively referred to as a centrifugal fluid machine), which are one type of fluid machines. Background technique [0002] A centrifugal compressor that has an impeller rotating at a high speed and boosts the pressure of a fluid by centrifugal force is used in a turbocharger or a turbo refrigerator mounted on a vehicle or a ship. This centrifugal compressor requires a large operating range, but when the flow rate of the fluid leading to the centrifugal compressor decreases, the discharge pressure pulsates to generate surge that destabilizes the operating state, which becomes the operating limit. Therefore, in order to secure a large operating range in the centrifugal compressor, it is necessary to reduce the critical flow rate at which surge occurs. [0003] In order to ...

AI Technical Summary

Problems solved by technology

However, when the fluid directed to the impeller is swirled back, the surge line also shifts to the right side of the graph, so the operating range itself narrows

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