A Suction Port for Improving Cavitation Performance of Centrifugal Pump

Abstract

The invention discloses a suction inlet capable of improving centrifugal pump cavitation performance and relates to the technical field of centrifugal pump manufacturing. A backflow sleeve (2) is arranged at the position of a pump inlet, the backflow sleeve (2) is formed by internal and external layers of circular-ring-shaped inner and outer rings, the inner diameter of the inner ring of the backflow sleeve is consistent with the size of a pump flow channel, the outer diameter of the inner ring of the backflow sleeve is consistent with the size of the position of the pump inlet of a pump body, and a gap between the inner ring and the outer ring is one twentieth of the outer diameter of the backflow sleeve and used for returning water. Four cube supports are arranged between the inner ring and the outer rings for connecting the inner ring and the outer ring, simultaneously, four threaded holes are uniformly distributed in a peripheral direction in the middle of the backflow sleeve to prevent the longitudinal endplay of the backflow sleeve, and four threaded holes are uniformly distributed in a direction of the backflow sleeve close to the pump inlet to prevent the axial endplay of the backflow sleeve. The suction inlet capable of improving centrifugal pump cavitation performance has the advantages that the structure is simple, the maintenance is convenient and the cavitation performance of the pump can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of centrifugal pump manufacturing, in particular to a suction port for improving the cavitation performance of a centrifugal pump. Background technique [0002] In centrifugal pumps, cavitation is a common phenomenon. Cavitation can lead to damage to blades, induce vibration and noise, reduce efficiency, and increase pump use and maintenance costs. The main cause of cavitation: when the pump is running at a large flow rate, there is a fluid backflow vortex at the impeller suction inlet, and part of the fluid enters from the suction section, and flows to the impeller inlet because it cannot enter the impeller, turbulent flow will occur before the impeller suction inlet, The vortex, and due to the generation of the vortex, the internal pressure of the fluid decreases and the temperature rises, resulting in cavitation. [0003] After retrieval, the patent applications related to the present invention include: ...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the cavitation performance of the existing centrifugal pump is poor and the efficiency of the pump is low when the existing centrifugal pump is at a small flow point. The NPSH of the pump can be reduced under the premise of affecting the efficiency

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