Impeller without hydraulic head hump

Abstract

The invention relates to impellers of vane pumps, in particular to an impeller without hydraulic head humps and solves the problem of instability in operation of a pump set resulted from hydraulic head humps of an existing impeller. The impeller comprises vane front and rear cover plates, a hub and a plurality of groups of vanes uniformly distributed between the vane front and rear cover plates, the vanes, the vane front cover plate and the vane rear cover plate are connected integrally, the vanes rotate through a shaft connected with the hub, fluid passages are reserved among the vanes, and fluid enters from vane inlet sides along an operation face to flow to vane outlet sides. Edges, close to the vane front cover plate, of inlet sides of each group of vanes are in forward triangular structures. Inlet angles, at distances 0.6-1.0 time of lengths of the inlet sides by taking intersection points of the vane rear cover plate and the vane inlet sides as starting points, of each group of vanes are smaller than 5 degrees. Impeller streamline length at the vane front cover plate is increased, inlet backflow of a small-flow area of a vane pump can be reduced, energy loss caused by air vortexes is avoided, flow hydraulic head humps are avoided, and stability in operation of the pump set is improved.

Description

technical field [0001] The invention relates to an impeller of a vane pump, in particular to an impeller with a head without a hump. Background technique [0002] When the flow rate of the existing vane pump structure is less than the design flow rate, the liquid flow at the inlet of the pump is mostly concentrated at the rear cover of the vane due to the centrifugal force, forming a vortex area at the front cover of the vane, and backflow occurs, that is, the vane pump The inlet of the small flow area produces backflow (also called secondary backflow). The number of blades and the airfoil shape affect the flow point and degree of backflow. [0003] The return flow at the inlet of the small flow area of ​​the vane pump will consume energy due to the generation of air vortices, so that the flow head curve will produce a hump (see Figure 5 The solid line curve in ), resulting in unstable operation of the pump set. Contents of the invention [0004] The purpose of the pres...

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Problems solved by technology

[0003] The return flow at the inlet of the small flow area of ​​the vane pump will consume energy due to the generation of air vortices, so that the flow head curve will produce a hump (see Figure 5 The solid line curve in ), resulting in unstable operation of the pump set

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