Open impeller for pump

Abstract

The invention provides an open impeller for a pump and belongs to the field of mechanical technology. The open impeller for the pump solves the problem that an inlet of the prior open impeller adopts the discontinuous open arrangement and easily winds up fibriform slender objects so as to cause blockage. The open impeller for the pump comprises a sheeted cover board and a plurality of vanes connected with the cover board into a whole. The center of the cover board is provided with a core shaft seat. The inside of the core shaft seat is provided with a shaft hole for a motor rotating shaft to pass through. All the vanes take the core shaft seat as the center to be uniformly arranged on a main lateral surface of the cover board in an involute shape. Inner ends of all the vanes are all connected on the core shaft seat. The open impeller for the pump has the advantages of high efficiency, strong anti-overloading capacity, no blockage, no winding and the like.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to an impeller, in particular to an open impeller used in a sewage pump. Background technique [0002] In the past, most of the design methods of multi-blade open impellers of sewage pumps used the design method of closed impellers, and then multiplied by an empirical coefficient to determine the outer diameter of the impeller and the width of the blade outlet. Since the range of empirical coefficients is very wide, it is recommended for the designer to select the coefficient bring great difficulty. If the coefficient is selected too large, the load on the pump will be too large; if the coefficient selected is small, the flow and head of the pump will not meet the design requirements. What's more, since the open impeller is required, and the design method is based on the design method of the closed impeller, the efficiency of the designed water pump is often very low, because the li...

AI Technical Summary

Problems solved by technology

If the coefficient is selected too large, the load on the pump will be too large; if the coefficient selected is small, the flow and head of the pump will not meet the design requirements.

What's more, since the open impeller is required, and the design method is based on the design method of the closed impeller, the efficiency of the designed water pump is often very low, because the liquid flow mode in the open impeller is completely different from that in the closed impeller. The liquid flow in the impeller, the circulating flow in the open impeller does not exist in the closed impeller, and the same method is used to solve different problems, obviously the results obtained cannot meet the design requirements

Another problem is that the sewage pump adopts an open multi-blade impeller, and the current open impeller inlet adopts an intermittent open arrangement, which is easy to wind up fibrous slender objects, destroying the shape of the impeller flow channel, and negatively affecting the performance of the pump. In severe cases, the flow path of the impeller will be blocked, making the pump unable to work

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