A mixed-flow pump impeller with a step rectification device in the flow channel

Abstract

The invention discloses a mixed-flow pump impeller with stepped rectifying devices arranged in runners. A hub flow guide end is installed at the front end of an impeller hub. Blades are installed on the impeller hub and provided with the stepped rectifying devices. Each stepped rectifying device is composed of a plurality of rectifying blades. The lengths and the curvatures of the rectifying blades are sequentially changed along with the structures of the impeller runners. The rectifying blades distributed in the direction from the blade rim to the impeller hub in the radial direction are rimstepped rectifying sections. The rectifying blades distributed in the direction from the impeller hub to the blade rim in the radial direction are speed loss vortex stepped rectifying sections. The rectifying blades are distributed in the direction from an impeller inlet to an impeller outlet in the axial direction, the hydraulic design structure of an original mixed-flow pump impeller runner is not changed, the stepped rectifying devices are additionally arranged in the impeller runners, the flow field structure, in the impeller runners close to approximate speed loss working condition points, of the mixed-flow pump is improved, speed loss vortex blobs in the impeller runners are eliminated, and spreading of the speed loss vortex blobs among the different impeller runners under the speedloss working condition is stopped.

Description

technical field [0001] The invention belongs to the technical field of fluid machinery, and in particular relates to a mixed-flow pump impeller with a stepped rectification device in a flow channel. Background technique [0002] Mixed-flow pumps are widely used in various fields such as farmland irrigation and drainage, waterlogging and flood control, industrial municipal, sewage treatment, and papermaking due to their large flow and moderate head. At present, in the design field of mixed-flow pumps, an equal circulation design method similar to that of axial-flow pumps is usually adopted, which does not consider the inertial effect and medium exchange in the process of fluid flow between adjacent axial surfaces. Axial inflow and oblique outflow structures are adopted. During the operation of the impeller designed in this way, the fluid between different axial surfaces will inevitably collide and exchange energy, so unstable flow is prone to occur inside the impeller channel...

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Problems solved by technology

The technical means and technical methods adopted in the above-mentioned patents cannot improve the generation of unstable flow field in the impeller of the mixed-flow pump near the stall condition, so they cannot be applied to the mixed-flow pump

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