Design method and volute of large-scale engineering pump volute

Abstract

The invention discloses a design method of a large-scale engineering pump volute and the volute, which comprises a volute outlet, a diffusion section (2), a throat (3), a movable guide vane (5), and a fixed guide vane (6) , the outlet guide vane (7), the partition tongue (8), the outer periphery of the movable guide vane is provided with a plurality of fixed guide vanes, the outlet guide vane is generally tangent to the inlet base circle D3 of the pressurized water chamber, and the inlet end of the outlet guide vane has Section I, there is section II at the tongue, from section II to section I in the flow direction, the volute is an annular volute, and the cross-sectional flow area of ​​the flow channel of the volute is basically the same. The annular volute structure with fixed guide vanes and movable guide vanes is adopted, and the geometric parameters of the volute are determined based on the volute velocity coefficient method according to the given working conditions, including the diameter of the base circle of the inlet of the pressurized water chamber D 3 , the inlet width of the pump pressure water chamber B 3 , the outer contour radius R of the volute, the number of movable guide vanes Z 1 , the number of fixed guide vanes z 2’ , the diffusion angle θ. It can reduce the pressure pulsation and radial force during the operation of the pump, and enhance the operation safety and stability of the pump under various working conditions.

Description

technical field [0001] The invention relates to the technical field of a volute of a hydraulic engineering pump and a volute of a centrifugal pump, in particular to a design method of a volute of a large engineering pump and the volute thereof. Background technique [0002] In recent years, my country's water conservancy and hydropower projects have developed by leaps and bounds, which has laid a solid foundation for the implementation of my country's sustainable development strategy while meeting the supply and demand of electricity and energy in my country. The volute is an important flow component of the centrifugal pump, which has a great influence on the efficiency index of the pump. When the fluid enters the volute from the impeller, due to the small gap between the impeller and the volute separating tongue / tongue, a strong interaction will occur, causing high-amplitude and low-frequency pressure pulsation in the area of ​​the conventional spiral volute separating tong...

AI Technical Summary

Problems solved by technology

However, although this improves production efficiency, improves mechanical strength, and reduces pressure pulsation to a certain extent, the use of trapezoidal or rectangular cross-section pump heads and low efficiency

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