Sectional horizontal multistage centrifugal pump with first-stage compound impeller

Abstract

The invention provides a sectional horizontal multistage centrifugal pump with a first-stage compound impeller, which comprises a stator part and a rotor part, the stator part comprises a water inlet section, a middle section and a water outlet section, the rotor part comprises a pump spindle, a first-stage impeller and impellers, the first-stage impeller and the impellers are fixed on the pump spindle, the first-stage impeller comprises a front cover plate, blades and a back cover plate, the blades are arranged between the front cover plate and the back cover plate and integrated with the front cover plate and the back cover plate, the blades are a plurality of long blades and a plurality of short blades, the long blades and the short blades are alternately arranged at intervals, so that impeller flow passages are formed, and at one side of an impeller inlet, the long blades are longer than the short blades. The sectional horizontal multistage centrifugal pump has the advantages that the inlet area of the first-stage impeller is enlarged, the inlet velocity is decreased, the suction performance of the pump is improved, and the cavitation of the pump operating at a high flow point is effectively prevented; meanwhile, because the number of the outlet side blades of the first-stage impeller is increased, the affection of the outlet backflow phenomenon on the performance of the pump can be decreased or prevented, which can help to enhance the performance of the pump.

Description

technical field [0001] The invention relates to the technical field of centrifugal pumps, in particular to a segmented horizontal multistage centrifugal pump with first-stage composite impellers. Background technique [0002] In the prior art, some mines, chemical industry and power plants have higher and higher requirements on the anti-cavitation performance of centrifugal pumps. The traditional methods to improve the anti-cavitation performance of centrifugal pumps are generally: increasing the diameter of the impeller inlet, changing the impeller material or using double-suction impellers, etc. However, increasing the diameter of the impeller inlet will significantly reduce the efficiency of the centrifugal pump; changing the material of the impeller and using anti-cavitation materials to make the impeller will increase the manufacturing cost of the impeller and cannot completely solve the problem of cavitation. The suction lift can be improved by adopting the double-suc...

AI Technical Summary

Problems solved by technology

However, increasing the diameter of the impeller inlet will significantly reduce the efficiency of the centrifugal pump; changing the material of the impeller and using anti-cavitation materials to make the impeller will increase the manufacturing cost of the impeller and cannot completely solve the problem of cavitation

The suction lift can be improved by adopting the double-suction first-stage impeller, but its structure is relatively complicated, and the maintenance is inconvenient and the cost is high

In particular, some centrifugal pumps in use have cavitation problems, and the transformation adopts the scheme of increasing the diameter of the impeller inlet or adopting double-suction impellers, which has a large change and is not realistic

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