A design method for the structure of the flanged blade at the outlet end of the impeller of a medium-high specific speed centrifugal pump

Abstract

The invention provides a design method for an impeller of an outlet-end folded edge blade structure of a middle-high-ratio rotating speed centrifugal pump. Blades are staggered and thickened at the position of an outlet of the impeller through the folded edge blades, and the staggered blades are designed to have different outlet placement angles and wrap angles and have different widths at the position of the outlet of the impeller. According to the requirement of the folded edge blades, the impeller inlet equivalent diameter, the impeller inlet diameter, the impeller outlet diameter, the impeller outlet width, the blade outlet placement angles, the blade wrap angles, the arc length corresponding to the outlet position between the folded edge upper blade and the folded edge lower blade of the impeller and the blade thickness at the outlet position of the impeller are reasonably designed. The situations that in the running process of the middle-high-ratio rotating speed centrifugal pump, the relative movement of liquid in the impeller is affected by axial vortexes, the hydraulic performance is affected, wake flow at the outlet of the impeller exists and the dynamic-static interference of a pumping chamber happens are improved.

Description

technical field [0001] The invention relates to a method for designing the vane structure of an impeller of a medium-high specific speed centrifugal pump, in particular to a method for designing the structure of a folded blade at the outlet end of the impeller of a medium-high specific speed centrifugal pump. Background technique [0002] The pump is a kind of general-purpose machinery with a wide range of applications. With the continuous improvement of the level of science and technology, the field of pump application is constantly expanding. Centrifugal pumps have a variety of structures and are the most widely used pumps. They are widely used in various sectors of social life and national economy such as urban water supply, petrochemical industry, shipbuilding industry, aerospace, agricultural irrigation, etc. Therefore, higher and higher requirements are put forward for the performance of centrifugal pumps, such as the requirements for stable operation under partial wo...

AI Technical Summary

Problems solved by technology

During the operation of the medium-high specific speed centrifugal pump, due to the relative motion of the liquid in the impeller under the influence of the axial vortex, it is easy to lose flow at the blade outlet, which affects the hydraulic performance of the pump, and the medium-high specific speed is affected by the wake of the impeller outlet during operation. Flow in the pressurized water chamber, causing static and dynamic interference

Images