Hydraulic design method, device and system for double-suction impeller

Abstract

The invention relates to a hydraulic design method, device and system for a double-suction impeller, and the method comprises the following steps: obtaining the given parameters of the required double-suction impeller, including the flow Q, the design lift H, the rotating speed n and the hub diameter dh; hydraulic parameters of the double-suction impeller are designed, wherein the hydraulic parameters comprise the impeller outer diameter D2, the impeller suction inner diameter Dj, the single-flow-channel blade outlet width b2, the blade wrap angle blade outlet mounting angle beta 2, the blade inlet attack angle delta beta 1 and the blade number Z; and drawing a two-dimensional engineering drawing of the double-suction impeller according to each hydraulic parameter. According to the invention, the double-suction impeller with high efficiency, high cavitation resistance and stable operation can be designed to replace the double-suction impeller with the defects of low efficiency, poor cavitation, unstable performance, unstable operation, large flow, easy superflow and the like, which is formed by the design in the prior art.

Description

technical field [0001] The invention relates to the field of impeller design, in particular to a hydraulic design method, device and system of a double suction impeller. Background technique [0002] At present, low specific speed double suction pumps on the market generally have defects such as low efficiency, unstable performance, poor cavitation performance, unstable operation, and overcurrent under large flow operating conditions, a large part of which is due to their hydraulic design. There are defects, such as: 1) The influence of casting and production is not fully considered in the design, resulting in reduced accuracy; 2) The three major losses in the pump are not considered and balanced; 3) Only efficiency and cavitation are considered opposite and ignore their unity ; 4) Only consider the single-point performance and ignore the possible impact of the hump phenomenon on the running stability. SUMMARY OF THE INVENTION [0003] The purpose of the present invention...

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Problems solved by technology

[0002] At present, low specific speed double suction pumps on the market generally have defects such as low efficiency, unstable performance, poor cavitation performance, unstable operation, and superflow under high flow operating conditions. A large part of the reason is its hydraulic design. There are defects, such as: 1) The influence of casting and production is not fully considered in the design, resulting in a decrease in precision; 2) There is no targeted consideration and balance of the three major losses in the pump; 3) Only the opposition between efficiency and cavitation is considered and their unity is ignored ; 4) Only consider single-point performance and ignore the impact of possible hump phenomenon on operation stability

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