Self-priming multistage centrifugal pump with variable-scale separation screen

Abstract

The invention discloses a self-suction multiple-stage centrifugal pump with a variable-scale separation net. The self-suction multiple-stage centrifugal pump comprises the variable-scale annular separation net and an annular net frame. The variable-scale separation net and the net frame are closely attached together to be mounted between a centrifugal pump outlet and a backflow hole and are closeto the centrifugal pump outlet. The scales of grids, in the circumferential direction of the separation net, of the separation net change constantly. According to the specific change rule, smaller-scale and closer separation nets are distributed in areas high in bubble concentration and axial speed, bubble backflow is stopped, and bubble floating is accelerated; and larger-scale and sparser separation nets are distributed in areas small in bubble concentration and low in axial speed, backflow flowing resistance of the self-suction stage is reduced, and self-suction is accelerated. According tothe self-suction multiple-stage centrifugal pump, turbulent flow in a pump casing cavity at different rotating speeds is fully rectified, flowing uniformity is obviously enhanced after the flow passes through the variable-scale separation net, the fluid speed is reduced, and pressure is enhanced; and fluid kinetic energy can be converted into pressure potential energy better, and the pressure difference between an inlet cavity and an impeller inlet is increased.

Description

technical field [0001] The invention relates to a multi-stage centrifugal pump, in particular to a multi-stage centrifugal pump with a variable-scale separation net to accelerate self-priming, and belongs to the field of fluid machinery. Background technique [0002] The pump is a general-purpose fluid machine with a large volume and a wide range of energy consumption. Almost everywhere there is a liquid flow, there are pumps working. Among all pump products, small multistage centrifugal pumps have the advantages of simple structure, convenient use and maintenance, large flow rate, high lift, and good energy efficiency. They are widely used in many industries such as urban water delivery, industry, and mining. [0003] Compared with mainstream small onshore pumps such as single-stage centrifugal pumps, jet pumps, and vortex pumps, small multi-stage centrifugal pumps, especially stainless steel multi-stage centrifugal pumps, have obvious advantages in energy efficiency and st...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a self-priming multi-stage centrifugal pump with a variable-scale separation net to accelerate self-priming to solve the shortcomings of the current self-priming multi-stage centrifugal pump with variable speed, such as too slow self-priming speed and poor self-priming stability

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