Double-inlet guide vane and volute combined axially-split multistage centrifugal pump

Abstract

The invention belongs to the technical field of centrifugal pumps, and relates to a double-inlet guide vane and volute combined axially-split multistage centrifugal pump which comprises a pump shaft, a driving end bearing assembly, an overflowing assembly and a non-driving end bearing assembly. The pump shaft sequentially penetrates through the driving end bearing assembly, the overflowing assembly and the non-driving end bearing assembly. The overflowing assembly comprises a pump cover and a pump body, double-suction impellers are arranged at the positions, at the middle section of the pump cover and the middle section of the pump body, of the pump shaft, and single-suction impellers are arranged at the positions, at the two ends of the pump cover and the two ends of the pump body, of the pump shaft respectively. Guide vanes are arranged at outlets of the single-suction impellers, one ends of the guide vanes are installed on the side wall of a suction volute chamber connecting part, the upper portions and the lower portions of the other ends of the guide vanes are installed on the inner wall of the pump cover and the inner wall of the pump body respectively, one end of an inner cavity of the suction volute chamber connecting part is communicated with outlet passages of the single-suction impellers, and the other end of the inner cavity of the suction volute chamber connecting part is communicated with inlet passages of the double-suction impellers. According to the double-inlet guide vane and volute combined axially-split multistage centrifugal pump, the pump cover and the pump body are simple in structure and small in size, the casting difficulty of the pump cover and the pump body is reduced, the guide vanes are easy to disassemble and assemble, and the pump efficiency is improved.

Description

Technical field [0001] The present invention relates to a dual-inlet vane and a volute-form-forming axial multi-stage centrifugal pump, which belongs to the technical field of centrifugal pumps. Background technique [0002] Multi-level centrifugal pump is widely used in the important field of national economy and other national economies such as fire, metallurgy, chemical and electricity; due to the operation of both sides of the centrifugal pump impeller, it is easy to generate the corresponding axial thrust, in order to reduce the axial thrust to the pump structure. Determination, often uses a two-sided multi-stage centrifugal pump on both sides of the impeller structure to cause axial thrust when the impeller is operated; the double import multi-stage centrifugal pump generally uses a volute structure or a vane structure; However, the pump body of the pump body of the volute of the volute structure, the shape of the pump cover, the shape of the pump cover, high casting rate, ...

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Problems solved by technology

[0002] Multi-stage centrifugal pumps are widely used in important fields of national economy such as fire protection, metallurgy, chemical industry and electric power; due to the unequal pressure on both sides of the centrifugal pump impeller, it is easy to generate corresponding axial thrust, in order to reduce the impact of axial thrust on the pump structure Destructive, double-inlet multi-stage centrifugal pumps with symmetrical impeller structures on both sides are often used, so that the impeller does not generate axial thrust during operation; double-inlet multi-stage centrifugal pumps in the prior art generally adopt volute structure or guide vane structure; However, the shape of the pump body and the pump cover of the double-inlet multi-stage centrifugal pump of the volute structure is complicated, the casting is difficult, the scrap rate is high, the cost increases, and the working efficiency of the centrifugal pump is low; the double-inlet multi-stage centrifugal pump with the guide vane structure The guide vane of the centrifugal pump is not easy to disassemble, which affects the overall dynamic balance of the centrifugal pump rotor and is inconvenient for maintenance

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