Novel inducing wheel

Abstract

The invention provides a novel inducing wheel. Blades of the inducing wheel consist of two long blades (1) and two short blades (2); the long and short blades are alternately and uniformly distributedin the circumferential direction; in the long blades (1), a section from inlet sides (1c, 1c') of the long blades to junction positions (1d, 1d') of variable-pitch sections and equal-pitch sections of the long blades is a variable-pitch section (1a); a section from the junction positions (1d, 1d') of the variable-pitch sections and the equal-pitch sections of the long blades to outlet sides (1e,1e') of the long blades is an equal-pitch section (1b); the blades are tangent at the junction positions (1d, 1d') of the variable-pitch sections and the equal-pitch sections of the long blades; in the short blades, a section from inlet sides (2b, 2b') of the short blades to outlet sides (2c, 2c') of the short blades is an equal-pitch section (2a); the outlet sides (1e, 1e') of the long blades andthe outlet sides (2c, 2c') of the short blades are uniformly distributed in a radial shape and in the circumferential direction; and the overall inducing wheel can rotate about an axis (oo') of a rotating shaft.

Description

technical field [0001] The invention relates to a fluid machine, in particular to the inducer technology of a centrifugal pump. Background technique [0002] At present, the inducer is one of the most effective ways to improve the cavitation performance of the centrifugal pump. It has the characteristics of low blade load, fewer blades, and high cavitation resistance. The number of conventional inducer blades is mostly three, and the blade distribution mostly adopts an equal-pitch or variable-pitch structure. The size of the equal-pitch inducer is easy to design, and the shape features are easy to process, but its outlet head cannot meet the energy requirements of the centrifugal impeller inlet, which affects the suction performance of the impeller; the variable-pitch inducer has good anti-cavitation performance, but due to pitch changes, the inducer The liquid flow at the outlet is unstable, and it is easy to generate vortices, which will cause the separation of the bounda...

AI Technical Summary

Problems solved by technology

The size of the equal-pitch inducer is easy to design, and the shape features are easy to process, but its outlet head cannot meet the energy requirements of the centrifugal impeller inlet, which affects the suction performance of the impeller; the variable-pitch inducer has good anti-cavitation performance, but due to pitch changes, the inducer The liquid flow at the outlet is unstable, and it is easy to generate vortices, which will cause the separation of the boundary layer and cause certain interference to the flow field at the inlet of the centrifugal impeller.

[0003] After retrieval, the current patent "a small high-speed centrifugal pump suitable for wide-range flow adjustment" (application number: CN201110209047.5) has a three-stage pitch of the inducer from the inlet to the outlet, which solves the problem of centrifugal pumps in the prior art. Limitation of anti-cavitation performance, but does not improve the inlet flow of the main impeller and has an impact on the impeller suction performance

The patent "a centrifugal pump structure design with long and short vane inducers" (application number: CN201110406928.6) adopts long and short vane inducers to improve the flow at the inlet of the main impeller, but the outlet lift of the inducer cannot meet the requirements of the main impeller. The demand for imported energy will degrade the performance of the centrifugal pump

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