Multi-stage centrifugal pump with improved impeller arrangement

Abstract

The invention relates to a multi-stage centrifugal pump with improved impeller arrangement. The centrifugal pump comprises impellers sheathed on a shaft of the centrifugal pump, wherein the impellers comprise a first-stage impeller, a 1 / 2-stage impeller, a 2 / 3-stage impeller and an inter-stage impeller, and the first-stage impeller, the 1 / 2-stage impeller, the 2 / 3-stage impeller and the inter-stage impeller are sequentially connected in series and are sheathed on the shaft of the centrifugal pump. Compared with the prior art, the multi-stage centrifugal pump has the advantages that the performance range of the single-type pump is greatly expanded, the product types are reduced, the universality is enhanced, the pump performance is similar to the actual work condition, the pump can operate in efficient regions, energy sources are saved, in addition, the one-time investment under the complicated work condition is reduced, and the adjustability of the product performance is enhanced.

Description

technical field [0001] The invention relates to a multistage centrifugal pump, in particular to a multistage centrifugal pump with improved impeller arrangement. Background technique [0002] The segmented multi-stage centrifugal pump adopts the form of radial split and multiple impellers connected in series. Its main parts are: water inlet section, middle section, water outlet section, shaft, impeller, guide vane, sealing ring, balance disc, balance ring, bearing parts, tension bolts, etc. The head of this pump depends on the number of stages of the pump, so this pump has a wide range of heads, and the head it can achieve is the highest among centrifugal pumps. [0003] The general arrangement of impellers in existing multi-stage centrifugal pumps is to use a first-stage impeller and multiple inter-stage impellers in series. The head of the impeller between the stages is the head difference between the pumps of different stages. [0004] This arrangement is applicable in...

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Problems solved by technology

[0005] (1) Multi-stage pumps generally have a large head, so the head of a single-stage impeller is also high, so the head difference between adjacent stages of pumps is relatively large. In order to cover a wider performance range, more types of pumps need to be designed , which is not conducive to generality;

[0006] (2) In the case of changes in some working conditions, such as mines extending downwards, the head requirements of the pump will gradually increase. If this condition is to be met, the pump should reserve space for increasing the impeller when leaving the factory, and the single-stage impeller The head is too large to meet the needs of the working conditions as much as possible;

[0007] (3) Since the impeller and guide vane of the multi-stage pump are designed in pairs, if the impeller needs to be cut to meet the requirements of the working conditions, the cutting volume of a single impeller is not enough to meet the adjustment needs of the multi-stage pump under high head, and the lowered Head is distributed to all impellers, which results in high workload and reduced pump efficiency

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