Multistage centrifugal pump with completely balanced axial force of impeller

Abstract

The invention relates to a multistage centrifugal pump with completely balanced axial force of an impeller. The multistage centrifugal pump is formed by connecting more than two stages of impellers, blower inlet casings, a water inlet section and a water outlet section in series; each impeller adopts a closed impeller which is provided with front and rear cover plates; an impeller shaft hole is in clearance fit with a pump shaft; and each impeller can axially slip; the front cover plate of each impeller is in end face seal with an inlet of the corresponding impeller; the rear cover plate of each impeller is provided with a balancing hole and adopts a radial seal ring; the outer diameter of the radial seal ring is greater than that of the impeller front cover plate in end face seal; and an balancing hole inlet on the impeller rear cover plate and an end clearance of each blower inlet casing are extremely small, so that each impeller has axial movement distance less than 1mm in the corresponding blower inlet casing. The multistage centrifugal pump provided by invention has the beneficial effects that: the impeller utilizes the self whole balancing axial force to thoroughly solve axial force damage problem of the multistage centrifugal pump; and besides the efficiency of a water pump can be high.

Description

Technical field [0001] The invention relates to a fluid machine for increasing liquid pressure, in particular to a multistage centrifugal pump which needs to overcome the axial force of the impeller. Background technique [0002] At present, the known multi-stage centrifugal pumps have serious axial force problems, because when the impellers are working, axial forces will be generated on the impellers, and the multi-stage centrifugal pumps have more impellers, and the axial force problems will be serious . Generally, single-stage centrifugal pumps use radial seal rings and balance holes or back blades on the impeller to balance part of the axial force, and the remaining axial force is borne by the bearing, while multi-stage centrifugal pumps generally use balance drums or balance discs. These two methods are used to balance the axial force. Among these four methods, only the balance disc device can fully automatically balance the axial force, and the other three methods ha...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of existing multistage centrifugal pumps, the present invention provides a multistage centrifugal pump with fully balanced impeller axial force, which can not only solve the problem of axial force of multistage centrifugal pumps, but also improve the reliability of multistage centrifugal pumps , and can also improve the efficiency of multistage centrifugal pumps

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