Cutting method for closed impeller of self-priming pump

Abstract

The invention discloses a cutting method for a closed impeller of a self-priming pump, and the cutting method specifically comprises the following steps: keeping the original outer diameter D of the closed impeller unchanged, cutting half blades of the closed impeller in a staggered manner, setting the cutting amount of cutting the blades as L, and setting the cutting amount L of the impellers with different blade numbers as different values, the cutting method for the closed impeller of the self-priming pump with 3-8 blades is explained and described, part of the blades of the impeller can be conveniently cut through a milling method, and the other part of the blades and the outer diameter of the impeller cover plate are kept unchanged, so that the lift of the pump is reduced by 2-20m, meanwhile, the self-priming performance of the pump is kept unchanged, and the service life of the pump is prolonged. The method cannot be realized by a traditional method for cutting the outer diameter of the impeller. According to the innovative method, the cost is low, the manufacturing period is short, the operability is high, the practicability is very high, and the effect that the pump lift is reduced by cutting the outer diameter of the impeller traditionally is achieved.

Description

technical field [0001] The invention relates to the technical field of self-priming pump impeller processing, in particular to a closed impeller cutting method of a self-priming pump. Background technique [0002] There are many factors that affect the self-priming performance of self-priming pumps. Among them, the gap between the partition tongue in the volute of the pump body and the outer diameter of the impeller is a very important factor. The smaller the gap, the more the gas-liquid mixture in the pump body will be discharged. , the shorter the self-priming time. Usually the gap is generally controlled between 0.5 and 1mm. However, pump products are not like motor products, the motor power has been standardized, so the number of power stages of the motor is fixed. The performance parameters of pump products are ever-changing, and so are the performance requirements of customers. Even a series of products sometimes cannot meet the requirements. In the selection, it of...

AI Technical Summary

Problems solved by technology

For ordinary closed impeller centrifugal pumps, the lift can be reduced by cutting the outer diameter of the closed impeller; and for self-priming pumps, after cutting the outer diameter of the closed impeller, the gap between the partition tongue in the volute of the pump body and the outer diameter of the closed impeller will become smaller. Large, thus affecting the self-priming performance of the pump, prolonging the self-priming time, and some even cannot self-priming

Adopting the parameters of the pump body to redesign the new impeller and re-model production, the cost is high and the production cycle is long

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