Tangent type low-flow high-lift pump

Abstract

The invention relates to a tangent type low-flow high-lift pump. The tangent type low-flow high-lift pump comprises a pump body, a pump cover, a pump shaft, an impeller, an impeller nut and a sealing gasket. The tangent type low-flow high-lift pump is characterized in that the impeller comprises an impeller hub, blades and a blade support toothed plate, wherein the blades are straight-plate blades, the straight-plate blades are arranged on the circumference of the impeller hub in an array mode, and the blade support toothed plate are toothed. The blade support toothed plate comprises a support ring and plate teeth on the periphery of the support ring, the inner end of the blade support toothed plate is fixedly connected with the impeller hub through the support ring, and the upper end of the blade support toothed plate is fixedly connected with the straight-plate blades through the support ring and the plate teeth. The height of each straight-plate blade is gradually reduced from the end, connected with the impeller hub, of the straight-plate blade to the outer end of the straight-plate blade in a tangential mode, so that the change of a lift curve is small, and the efficiency is higher than that of an ordinary centrifugal pump under the working conditions of the low flow and the low specific speed. The tangent type low-flow high-lift pump has the advantages that the flow is variable, the pressure is stabilized, and the flow lift curve is flat.

Description

technical field [0001] The invention relates to the technical field of fluid machinery, in particular to a tangential centrifugal pump with small flow rate and high lift. Background technique [0002] At present, existing centrifugal pumps mainly include a pump body, a pump shaft, a pump cover and an impeller. The impeller is composed of a bottom plate, a top plate, an impeller hub and blades. The impeller hub is fixed on the pump shaft with the sealing gasket. The bottom end of the impeller hub is fixedly connected to the bottom plate, and the top end is fixedly connected to the top plate. There are multiple blades between the top plate and the bottom plate, and the blades are arc-shaped to increase the size of the centrifugal pump. The disadvantage is that the head of the impeller of this structure is low, and when the flow is small, the high head will cause excessive pressure and cause harm to the system. Contents of the invention [0003] The purpose of the present i...

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Problems solved by technology

[0002] At present, existing centrifugal pumps mainly include a pump body, a pump shaft, a pump cover and an impeller. The impeller is composed of a bottom plate, a top plate, an impeller hub and blades. The impeller hub is fixed on the pump shaft with the sealing gasket. The bottom end of the impeller hub is fixedly connected to the bottom plate, and the top end is fixedly connected to the top plate. There are multiple blades between the top plate and the bottom plate, and the blades are arc-shaped to increase the size of the centrifugal pump. The disadvantage is that the head of the impeller of this structure is low, and when the flow is small, the head is too high, which will cause excessive pressure and cause harm to the system.

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