Double-suction type holosymmetrical multi-stage pump

Abstract

The invention discloses a double-suction type holosymmetrical multi-stage pump. The double-suction type holosymmetrical multi-stage pump comprises secondary impellers, a double-suction impeller and adouble-suction pump body, the double-suction pump body is arranged outside the double-suction impeller, the double-suction impeller is of a holosymmetrical structure, and the double-suction pump bodyis located on the coaxial line of the double-suction impeller. According to the double-suction type holosymmetrical multi-stage pump, the multi-stage double-suction pump can be conveniently assembledon the premise that existing single-suction type multi-stage pump parts are utilized to the maximum limit, the flow of the pump is multiplied, and the performance range of the pump is widened; primaryimpellers, the secondary impellers and the double-suction impeller are arranged in a holosymmetrical manner, therefore, the axial force is thoroughly balanced, and the theoretical axial force is equal to zero; the flow passing area of the primary impellers is increased compared with that of the secondary impellers, and therefore the cavitation performance of the pump is improved; through use of the double-suction impeller and the double-suction pump body, liquid collection and confluence are convenient, and the hydraulic efficiency of the pump is improved; and a double shaft extension schemeis adopted, therefore, driving can be achieved from any one end, and the diversity requirements of pump installation are met.

Description

technical field [0001] The invention belongs to the related technical field of multistage double-suction pumps, and in particular relates to a double-suction fully symmetrical multistage pump. Background technique [0002] The multi-stage pump is to connect the impellers of the single-stage pump concentrically through a shaft to increase the head or pressure of the pump under the condition of constant flow. A pump with two impellers is called a two-stage pump, and a pump with multiple impellers is called a multi-stage pump. The medium is first inhaled from the first-stage impeller, after being pressurized by the first-stage impeller, it enters the suction port of the second-stage impeller through the flow channel or guide vane, and is pressurized by the second-stage impeller, and so on. After being pressurized by the multi-stage impeller, the medium is The outlet section is collected by the vortex chamber and flows out through the outlet flange, which is essentially a singl...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a double-suction fully symmetrical multi-stage pump to solve the problems of axial force balance, performance expansion, low efficiency and cavitation performance in the above-mentioned background technology

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