Axial force balancing device of pump

Abstract

The invention relates to an axial force balancing device of a pump, which is characterized in that an engine body at the rear end of an impeller is provided with one or a set of step type floating sealing sleeve(s). When in work, under the condition of changeable pressure at the two ends, the step type floating sealing sleeve(s) can automatically regulate the axial clearance with the impeller, thereby having the effects of reducing leakage flow rate and automatically balancing axial force; a rotating main shaft at the rear end of the impeller is provided with a step type balancing drum matched with the step type floating sealing sleeve(s); the step type balancing drum is not only matched with the function that the step type floating sealing sleeve(s) can automatically regulate the axial clearance with the impeller, but also preserves the function of the traditional balancing drum, and has the effect of labyrinth clearance seal. The axial force balancing device of the pump has compact structure and small axial dimension, is high in the generalized degree with the existing products and parts, can greatly reduce the volume loss and disk friction loss, improves the efficiency of the pump, and has the characteristics of simple structure, low manufacturing cost as well as safe and reliable use.

Description

technical field [0001] The invention relates to an axial force balance device, in particular to an axial force balance device of a pump. Background technique [0002] In the axial force balance device of the existing structure of the segmented multistage centrifugal pump, the vertical pump generally adopts the balance drum structure; the horizontal pump generally adopts the balance disc structure. in: [0003] The structure of the balance drum device is relatively simple. The pressure difference between the two ends of the balance drum is realized by connecting one end with the inlet low-pressure end. The leakage flow rate is determined by the radial gap between the balance drum and the balance sleeve and the frictional resistance of the disc. The leakage flow of existing traditional structure products is 5% to 18% of the rated flow (inversely proportional to the specific speed of the water pump), and the volume leakage loss is very large. [0004] The balance disc works b...

AI Technical Summary

Problems solved by technology

This structure basically has no leakage when it works normally, and the efficiency is very high. However, the manufacturing cost of the static ring compensation balanced mechanical seal is high, and the requirements for the processing and overall assembly control accuracy of other parts are relatively high, and once the static ring compensation balanced mechanical seal If damaged, the efficiency will be reduced, and the balance of axial force may not be guaranteed due to the excessive leakage of the mechanical seal and the restriction of the return flow of the balance tube

Images