Axial flow pump and anti-cavitation impeller thereof

Abstract

The invention relates to an axial flow pump and an anti-cavitation impeller thereof, and belongs to the technical field of pumps. The axial flow pump impeller comprises a hub and a blade fixed to thehub. In the direction that the front edge of the blade points at the tail edge of the blade, the front half part of a suction force face of the blade is provided with one or more cavitation restraining strips which are arranged at intervals in the pointing direction, and the cavitation restraining strips are each of a strip-shaped protruding structure with the length direction arranged in the spreading direction. The front half part of the suction force face of the blade of the axial flow pump is provided with the cavitation restraining strips extending in the spreading direction, accordingly,the pressure on the front side blade faces of the restraining strips is improved, generation of blade suction force face front edge cavitation is restrained, vibration, noise, cavitation erosion andother harm caused by front edge cavitation are effectively reduced, and the axial flow pump and the anti-cavitation impeller thereof can be widely applied to the fields of pumps, water pumping and other projects.

Description

technical field [0001] The invention relates to the technical field of pumps, in particular to an anti-cavitation impeller and an axial flow pump constructed with the anti-cavitation impeller. Background technique [0002] Axial flow pump is widely used in industrial production as a large flow and low head pump. It converts mechanical energy into fluid energy through the rotation of the impeller. Cavitation often occurs on the impeller, which not only reduces the head and efficiency of the pump, but also causes problems such as vibration, noise and cavitation. [0003] In order to control cavitation or alleviate the damage caused by cavitation, the main measures taken at present include impeller inlet optimization, blade load optimization, installation of inducer, inlet ejection booster, and double-suction structure, etc., in order to reduce pump inlet. Control or alleviate cavitation by increasing the flow rate and increasing the inlet pressure of the pump. However, among...

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Problems solved by technology

Although it proposes to set up raised retaining strips and control cloud cavitation based on the mechanism of blocking the return jet flow, it cannot deal with the cavitation phenomenon existing at the leading edge of the blade, which will cause it to occur at the leading edge of the blade under unsteady characteristics. Hazards such as vibration and noise

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