Hydraulic design method of semi-open type three-blade blockage-free impeller

Abstract

The invention provides a hydraulic design method of a semi-open type three-blade blockage-free impeller. The hydraulic design method of the semi-open type three-blade blockage-free impeller is characterized in that the impeller is of the three-blade semi-open type, the surface of the impeller is coated with nanometer WC-8Co super-hard composite coating through a high-velocity oxygen-fuel spraying technology, the design method of the main geometric parameters of the impeller is provided, and the main geometric parameters of the impeller comprise the outer diameter D2 of the impeller, the outlet width b2 of the impeller, the outlet installation angle beta 2 of the impeller and the wrap angle phi of each blade. On one hand, an existing design scheme is improved; on the other hand, the work environments of domestic and chemical sewage pumps are taken into fuller consideration, and for the work specificity of the domestic and chemical sewage pumps and the problems prone to generation in practice, targeted optimization of the design formula is conducted; the wear resistance and efficient and stable work of the semi-open type impeller can be ensured, and the adaptability of the semi-open type impeller to adverse work environments is improved.

Description

technical field [0001] The invention relates to the field of fluid machinery, in particular to a hydraulic design method for a semi-open three-blade non-clogging impeller. Background technique [0002] Sewage pump is a kind of impurity pump, which is mainly used to transport urban sewage or fluid medium containing solid particles such as fibers and paper scraps. Because the conveyed medium contains fibers that are easy to entangle and deposit or bunch. Therefore, the flow channel of this kind of pump is easy to be blocked. Once the pump is blocked, the pump will not work normally, the motor will be overloaded and heated, and even the motor will be burned, resulting in poor sewage discharge. Bring serious impact to urban life and environmental protection. Therefore, anti-clogging and reliability are important factors for the quality of sewage pumps. [0003] The sewage pump is the same as other pumps. The impeller and the pressure water chamber are the two core components ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problems of the existing technical solutions, the present invention provides a brand-new hydraulic design method of a semi-open three-blade non-clogging impeller, which improves the existing design on the one hand, and fully considers life and chemical engineering For the working environment of the sewage pump, a lot of design formulas have been optimized according to the particularity of its work and the problems that are likely to occur in practice

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