Multistage middle-open type centrifugal pump axial force balance structure

多级中开式离心泵轴向力平衡结构

Abstract

The utility model discloses a multistage middle-open type centrifugal pump axial force balance structure. A plurality of impellers of odd number are assembled on a pump shaft, the impellers of odd number are divided into two groups, two groups of the impellers are opposite in direction, and one group of the impellers are more than the other group of the impellers by one. An interstage ring and an interstage sleeve are assembled between two groups of the impellers, wherein the interstage sleeve is arranged on the inner side of the interstage ring, and outlets of two groups of the impellers are communicated through gaps between the interstage ring and the interstage sleeve. A pressure relief ring and a pressure relief sleeve are assembled between a second suction chamber and a second throat bushing, wherein the pressure relief sleeve is arranged on the inner side of the pressure relief ring, a balance pipe is connected from an empty cavity formed by the second throat bushing and the pressure relief ring and the pressure relief sleeve and is communicated with a first suction chamber, and therefore the second suction chamber is communicated with the first suction chamber through gaps between the pressure relief ring and the pressure relief sleeve and the balance pipe. Outer diameter change of the interstage ring and the pressure relief ring is utilized to form balance of rotor axial force. The multistage middle-open type centrifugal pump axial force balance structure has the advantages of being simple, easy to achieve and good in axial force balance effect.
本实用新型公开了一种多级中开式离心泵轴向力平衡结构,其是在泵轴上装配多个且为奇数个的叶轮,该奇数个叶轮分为两组,两组叶轮的方向相反且其中一组较另一组多出一个叶轮,两组叶轮之间装配级间环、级间套,级间套位于级间环内侧,使得两组叶轮的出口通过级间环与级间套之间的间隙连通,第二吸入腔与第二喉部衬套之间装配泄压环、泄压套,泄压套位于泄压环内侧,一平衡管从第二喉部衬套与泄压环、泄压套之间形成的空腔接入并连通第一吸入腔,使得第二吸入腔经泄压环与泄压套之间的间隙、平衡管与第一吸入腔连通。本实用新型采用节间环与泄压环的外径变化,来形成转子轴向力的平衡,结构简单易实现,轴向力平衡效果好。

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Cited By (4)

    Publication numberPublication dateAssigneeTitle
    CN-102878104-AJanuary 16, 2013浙江佳力科技股份有限公司Axial force balanced structure of multilevel central opening type centrifugal pump
    CN-103307014-ASeptember 18, 2013李维熙一种单吸自平衡多级水泵
    CN-103307014-BJuly 06, 2016李维熙一种单吸自平衡多级水泵
    CN-105257547-AJanuary 20, 2016合肥通用机械研究院Long-life efficient multiple-stage centrifugal pump