Axial force self-balancing multi-stage pump

Abstract

The invention relates to a multi-stage pump capable of self-balancing axial force, and solves the problems that a front cover plate and a rear cover plate are equal in outer diameter and the specific speed is nsgt in the prior art; in order to solve the problems of high energy consumption, short service life, poor operation stability and the like caused by huge axial force generated by the centrifugal pump, the adopted technical scheme is as follows: the centrifugal pump comprises a pump body, an impeller string arranged in the pump body and a plurality of groups of impeller units of the impeller string, and is characterized in that one group of impeller unit comprises a flow guide cover and an impeller arranged in a flow guide cavity of the flow guide cover; the impeller comprises a front cover plate, a rear cover plate and blades arranged between the front cover plate and the rear cover plate, the outer diameter of the front cover plate is larger than that of the rear cover plate, the front cover plate is matched with the bottom of the flow guide cavity, and the front cover plate is matched with the opening portion of the flow guide cavity. The impeller has the advantages that the impeller with the area of the front cover plate larger than that of the rear cover plate is adopted, meanwhile, the flow guide cover is matched, self-balance of axial force of the impeller is achieved, the pump runs more stably and reliably, power consumption is greatly reduced, social and economic benefits are greatly improved, and the purposes of energy conservation and emission reduction are achieved.

Description

technical field [0001] The invention relates to a multistage pump, in particular to a self-balancing axial force multistage pump. Background technique [0002] Affected by the hydraulic performance design, the impellers in the conventional multi-stage pump adopt the method of equal outer diameter of the front cover plate and the rear cover plate, and, for the multi-stage pump, there is no impeller and guide in each stage. hood fit scheme. For the existing multi-stage pump, the liquid is thrown out of the impeller vertically and enters the pump body or the deflector due to the centrifugal force of the impeller. However, the front and rear cover plates with the same outer diameter have an unequal cover plate area ratio, resulting in a larger axial force of the impeller. Especially for multi-stage pumps, the maximum number of impellers reaches 40, and the accumulated axial force is very large. The huge axial force greatly reduces the service life of the motor and the bearing,...

AI Technical Summary

Problems solved by technology

[0005] 1. In terms of structural performance: a large axial force is generated, and the balance of the axial force needs to consume the bearing load of the motor, which increases the energy consumption of the motor;

[0006] 2. In terms of hydraulic performance: the liquid flow direction is unstable, and internal vortex is easy to form, resulting in large hydraulic loss, which is a bottleneck problem in the industry;

[0007] 3. In terms of comprehensive performance: it can no longer meet the energy-saving requirements, and it is not conducive to responding to the call for carbon neutrality and carbon peaking

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