Impellor used for centrifugal pump and centrifugal type fan

Abstract

A blade wheel for centrifugal pump (or blower) is composed of hub, webs and two or more blades consisting of the primary and secondary blades, which are overlapped at the small radium position and connected by a sealing plate at the maximal radium position. Its advantages are high efficiency and low energy consumption.

Description

technical field [0001] The invention mainly relates to the field of centrifugal pumps and centrifugal fans, in particular to an impeller for centrifugal pumps and centrifugal fans. Background technique [0002] Since the advent of centrifugal pumps and centrifugal fans, the structure of the impeller, the core component of its work, has been based on a hypothetical theoretical basis, which is to make the number of impeller blades infinitely large, and the thickness of the blades is infinitely small, thereby eliminating water in the impeller. The inner vortex can improve the working efficiency of the whole centrifugal pump to achieve the effect of energy saving. But in the actual structure, the number of blades of the impeller is very few, that is, under the effective volume of the overall design of the centrifugal pump, the number of blades is limited, and the blades also have a certain thickness. Because of the discrepancy between theory and reality, people have generally b...

AI Technical Summary

Problems solved by technology

[0006] 4. The axial width at the outlet of the outer diameter of the traditional impeller becomes smaller, and the center of the outlet is not at the center of the volute, which will cause the following disadvantages. The former cannot make full use of the kinetic energy of the water leaving the outer diameter of the impeller, because the narrow water spray How can we impel the water in the large pipe to advance, so we can only convert the kinetic energy into static pressure, and then press the water to the outlet pipe by the static pressure

And because the axial width of the impeller outlet is not in the center of the volute, the fluid will be spirally rotated horizontally along the flow channel of the volute to the one-sided water inlet. For those pumps with small flow and high lift, this phenomenon will It is particularly serious, so it consumes a lot of useless work

[0007] From the above analysis, it can be seen that for those pumps and fans with large flow and low head, the above phenomena are relatively small, but still have an impact.

Especially for impellers with a large number of blades, the vortex of the negative pressure on the back of the blades is small, but the blades are too dense, the friction surface increases, and the friction loss is also increased.

It will have a great impact on those pumps with small flow and high head. It is worth mentioning that it is easy to transport the pulp pumps, sediment pumps and all liquids containing solids and suspended substances that are widely used in industrial production. The pump whose impeller water inlet is blocked, because of its small number of blades, will have a greater impact on the above phenomenon, so its operating efficiency will be very low

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