Centrifugal pump sealing ring with axial guide vanes

Abstract

The invention discloses a centrifugal pump sealing ring which is provided with axial guide vanes and is arranged between a volute and an impeller. The centrifugal pump sealing ring is composed of a circular ring and the axial guide vanes, the axial guide vanes with the number of 8 to 10 are evenly and fixedly arranged on the inner side wall of the circular ring in the circumferential direction, the axial guide vanes protrude inwards in the radial direction, the shape of each axial guide vane is the NACA wing shape, the chord length L of each axial guide vane is equal to the radius R, the placement angle ranges from 10 degrees to 20 degrees, and the height h of each axial guide vane in the radial direction is 0.05-0.1 time of the radius R. The centrifugal pump sealing ring is a non-contactsealing ring based on an axial flow guide mechanism, when the centrifugal pump impeller rotates, a liquid between the impeller and the volute is driven to rotate, the rotary liquid generates directional flow under the induction of the fixed axial guide vanes, the induction direction is opposite to the movement direction of the leakage liquid between the impeller and the volute, and then the purpose of preventing the liquid from leaking from the gap between the impeller and the volute is achieved.

Description

technical field [0001] The invention relates to a centrifugal pump structure in the field of fluid machinery, in particular to a centrifugal pump sealing device installed in the gap between the volute and the impeller to prevent fluid leakage between the volute and the impeller. Background technique [0002] A centrifugal pump is a typical blade-type fluid machine. Its working principle is to drive the impeller to rotate through the prime mover to do work on the fluid, and convert the mechanical energy into the kinetic energy and pressure energy of the fluid, so as to realize the transportation of the fluid. Generally, the centrifugal pump with a specific speed between 30 and 80 is called a low specific speed centrifugal pump. The impeller of a low specific speed centrifugal pump is inevitably accompanied by energy loss during the work process. The energy loss is mainly divided into three types: flow loss, Volume loss and disc friction loss. Among them, the volume loss refe...

AI Technical Summary

Problems solved by technology

At present, there are two commonly used sealing methods between the volute and the impeller: one is to set the leakage gap between the mouth ring and the impeller in a small range; the other is to use a labyrinth seal by setting a complex sealing structure. However, when the gap is set to be small, the wear is serious, and the stability will be poor, and the overly complicated sealing structure is not conducive to processing and assembly

[0003] At present, in order to solve a series of problems such as severe wear and difficult assembly caused by reducing the gap, a non-contact sealing structure that can ensure good sealing performance under a large gap has been proposed.

For example, Chinese patent application number 201420065364.3 proposes a high-efficiency centrifugal pump with impeller with non-contact sealing function. The annular impeller seal ring extending on both sides of the impeller and the pump body built into the pump body match the impeller seal ring. Threads are machined on the inner surface of the wear-resistant ring to reduce or prevent the leakage at the radial gap of the impeller seal ring. Affects the hydraulic performance of the impeller; thread seals wear during use, and once worn excessively, the entire impeller needs to be replaced, which increases maintenance costs

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