Matched improved structure for impeller and guide vane body bodies of axial flow pump

Abstract

The invention provides a matched improved structure for an impeller and a guide vane body bodies of an axial flow pump. The matched improved structure comprises a casing, an the impeller and two guide vane bodies, wherein the impeller comprises a hub and a plurality of vanes which are equidistantly distributed on the periphery of the hub; each vane is provided with an upper end surface, a lower end surface, a pressure surface, a rear end surface and a front end surface; and the axial displacement between any point on the each front end surface and the hub is equal to the axial distance between another point on the each front end surface and the hub. When the axial displacement between the each front end surface and the axis of the hub is R, an intersection line between the each pressure surface and the corresponding front end surface is a first intersection line; an intersection line between the each front end surface and the corresponding upper end surface is a second intersecting line; and an included angles between each points on the each first intersecting line and the each second intersecting line is are the same. According to the structure for improving the impeller and the guide vane bodies thereof, which is disclosed by the invention, the circumferential velocity component of fluid in the impeller is reduced, so that the circumferential velocity component of the fluid in the impeller approaches to the circumferential velocity of the impeller vane more difficultly and the effect of lifting a load pressure is achieved.

Description

technical field [0001] The invention relates to an axial flow pump, and more specifically refers to an improved matching structure of an impeller and a guide vane body of an axial flow pump for efficient transmission of impeller kinetic energy and fluid kinetic energy. Background technique [0002] The cross-sections of the impeller blades of all previous axial flow pumps (Figure 1) are arc-shaped, and the airflow angle at the leading edge is small and the airflow angle at the edge is large. There are several guide vanes behind the impeller, and the guide vanes near the impeller have a certain angle with the axis Following the rotation direction of the impeller, the other end of the guide vane is parallel to the axial direction, and the middle of the guide vane is a transfer transition between the upper and lower ends. The characteristic of this design is: the rotation of the fluid through the impeller naturally produces two component motions in the axial direction and the c...

AI Technical Summary

Problems solved by technology

The disadvantage of this design is that the load pressure is small. When the load pressure is close to the limit, the peripheral velocity component of the fluid in the impeller is close to the peripheral velocity of the impeller blade. When the load pressure is further increased, the fluid can only rotate synchronously with the impeller blade and cannot generate flow.

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