High-lift multi-stage centrifugal pump

Abstract

The invention relates to a pump body, in particular to a high-lift multi-stage centrifugal pump. The high-lift multi-stage centrifugal pump comprises a pump base, a stator part and a rotor part, wherein the stator part comprises a water inlet end cover, a suction segment, a middle segment, a discharge segment and a bearing supporting part; the bearing supporting part comprises a bearing part and a bearing bush; the bearing part comprises a bearing pedestal and a sliding bearing which is connected with the bearing pedestal; the bearing bush is arranged between the sliding bearing and a rotating shaft; the rotor part comprises impellers, the rotating shaft, a shaft sleeve and a balance disk; the bearing part and the bearing bush adopt a horizontal split structure; the tail end of the rotating shaft is provided with a balance disc wear indicating device; and the first-stage impeller has a double-suction structure, while the other stages of impellers have single-suction structures. Due to the high-lift multi-stage centrifugal pump, the high-lift performance of the pump is ensured; the pump can maintain a good working condition for a long time; and the operating performance of the pump is improved.

Description

technical field [0001] The invention relates to a pump body, in particular to a high lift multistage centrifugal pump. Background technique [0002] High-lift multistage centrifugal pumps are widely used in deep mine drainage requirements due to their high lift. However, there are the following defects, which affect its operational performance. [0003] 1. The impeller is the core component of a high-lift multi-stage centrifugal pump. The current impeller is divided into single-suction impeller and double-suction impeller. The single-suction impeller has the advantage of high lift, but it has small flow, poor static balance and is prone to steam However, the double-suction impeller has the advantages of large flow rate and good anti-cavitation performance, but it has the disadvantage of low head. Using single-suction impeller or double-suction impeller alone will affect the performance of the centrifugal pump to a certain extent. [0004] 2. Since the speed of the high-lif...

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Problems solved by technology

However, there are the following defects, which affect its operation performance

[0003] 1. The impeller is the core component of a high-lift multi-stage centrifugal pump. The current impeller is divided into single-suction impeller and double-suction impeller. The single-suction impeller has the advantage of high lift, but it has small flow, poor static balance and is prone to steam However, the double-suction impeller has the advantages of large flow rate and good anti-cavitation performance, but it has the disadvantage of low head. Using single-suction impeller or double-suction impeller alone will affect the performance of the centrifugal pump to a certain extent.

[0004] 2. Since the speed of the high-lift multi-stage centrifugal pump is lower than that of the high-lift pump, the speed of the pump is high, and the number of stages is large, so the shaft has higher mechanical properties and balance performance when it is running, and the performance of the supporting parts as the shaft is the same It is particularly important when it comes to pump support. There are two structural forms of rolling bearings and sliding bearings. In comparison, sliding bearings are superior to rolling bearings in various performances, but sliding bearings are easy to wear and need to be installed between them and the shaft. Bearing bushes are added between them, and the bearing bushes need to be replaced after wear and tear after long-term operation. However, the rolling bearings used now are often integrated. At this time, it is more troublesome to replace, which prolongs the maintenance cycle and increases the working efficiency of high-lift multistage centrifugal pumps. to reduce

Since the multi-stage pump is a kind of dynamic balance achieved by the movement of the rotor parts, the wear of the balance disc is inevitable. If the wear of the balance disc reaches a certain value, it is necessary to adjust the balance disc in time, otherwise it will be damaged. The operation of the pump brings great safety hazards, but because the balance plate is set in the pump body, it is impossible to make an accurate judgment on its wear condition intuitively, but errors are prone to occur in intuitive predictions, resulting in accidents

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