Pump body structure capable of reducing hydraulic shock excitation and centrifugal pump

Abstract

The invention provides a pump body structure capable of reducing hydraulic shock excitation and a centrifugal pump. The pump body structure comprises a volute and an impeller, the impeller is arrangedin the volute, and the ratio of the diameter of the impeller to the diameter of a base circle of the volute ranges from 1: 1.08 to 1: 1.13. According to the pump body structure capable of reducing hydraulic shock excitation and the centrifugal pump provided by the invention, the technical prejudice in the prior art is overcome; the ratio of the diameter of the impeller to the diameter of the basecircle of the volute is increased by 0.05 time on the basis of the prior art; the damping range of a fluid medium is obviously increased; hydraulic shock excitation is effectively reduced; the angleof the mounting angle of a separation tongue is increased by 10 degrees on the basis of the prior art; the distance between the edge of the impeller and the end of the separation tongue is increased,the dynamic and static interference effect is weakened, the end of the separation tongue is arranged to be in a wave shape, hydraulic shock excitation is further reduced, and therefore the maximum distance between impeller blades and the separation tongue is increased to the maximum extent; and the damping effect of fluid media is fully utilized, and the vibration noise problem of the centrifugalpump is solved.

Description

technical field [0001] The invention relates to the technical field of centrifugal pumps, in particular to a pump body structure for reducing hydraulic vibration and a centrifugal pump. Background technique [0002] There are two important geometric parameters in the hydraulic design of the centrifugal pump body, one is the diameter D3 of the base circle of the volute directly related to the outer diameter of the impeller D2, and the other is the placement angle of the tongue φ0. For a centrifugal pump with a small specific speed ns=60~130, according to the conventional design theory, D3=(1.03~1.08)*D2 is usually selected, and the tongue placement angle φ0=15°~25°. However, the diameter distance between the impeller blade outlet of the centrifugal pump and the diaphragm tongue of the pump body designed according to the conventional value selection method is very small, resulting in a very obvious static and dynamic interference effect, which cannot meet the increasingly stri...

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Problems solved by technology

[0003] In order to solve the technical problem of excessive hydraulic excitation caused by the dynamic and static interference of the centrifugal pump designed according to the conventional design size and the specific speed is in the range of 60-130, and provide a method that can effectively reduce the dynamic and static interference effect under the premise of ensuring performance. Pump Body Structure and Centrifugal Pump for Reducing Hydraulic Vibration

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