Nuclear power plant horizontal multi-stage centrifugal pump core package disassembling and assembling tool and method

Abstract

The invention relates to the technical field of nuclear power maintenance, and particularly discloses a nuclear power plant horizontal multi-stage centrifugal pump core package disassembling and assembling tool and method. The disassembling and assembling tool and method is characterized in that an upper supporting ring, a middle supporting seat and a bottom plate are fixed through supporting ribplates, and the upper supporting ring, the middle supporting seat and the bottom plate are parallel to one another; when a core package is disassembling, the pump core package is slowly lifted and stably placed on a disassembling tool, so that the outer edge of the pump core package is clamped on the upper supporting ring, and then subsequent disassembling operation is completed. According to thenuclear power plant horizontal multi-stage centrifugal pump core package disassembling and assembling tool and method, manpower is greatly liberated, on-site core package disassembling and rotor channeling amount measurement operation becomes simple and efficient, and equipment damage risks as well as safety risks can be reduced.

Description

technical field [0001] The invention belongs to the technical field of nuclear power maintenance, and in particular relates to a nuclear power plant horizontal multistage centrifugal pump core package disassembly tool and method. Background technique [0002] At present, the core packs of horizontal multistage centrifugal pumps in nuclear power plants are mostly disassembled and assembled horizontally. Taking the auxiliary feedwater electric pump of a nuclear power plant as an example, the HDF101-1125 auxiliary feedwater electric pump of a nuclear power plant adopts a horizontal double casing, the inner casing is an integral core-pulling structure, the number of stages is 12, and the speed is 2980r / min. The disadvantages of using horizontal disassembly and assembly of core packs mainly include the following aspects: [0003] 1) Due to the small gap between static and dynamic fit, if the horizontal disassembly is used, it will be more difficult to disassemble and easily caus...

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Problems solved by technology

[0003] 1) Due to the small gap between static and dynamic fit, if the horizontal disassembly is used, it will be more difficult to disassemble and easily cause the pump shaft to be strained;

[0004] 2) The multi-stage centrifugal pump has a long shafting system, many parts, and heavy weight. It is inconvenient to disassemble and lift horizontally, and the risk of mechanical damage increases;

[0005] 3) It is cumbersome to measure the movement amount of each level of the core pack during reassembly, which can easily lead to incomplete reassembly between all levels, resulting in unqualified final movement amount, resulting in re-disassembly workload and waste of manpower;

[0006] 4) The disassembly process requires a large number of professional and operating personnel, which is not conducive to the safe, reliable and efficient maintenance of on-site equipment;

[0007] 5) The entire maintenance process takes a long time and is difficult to control, prone to human error

[0008] In addition, during the assembly of the core package, it takes 8 people 15 minutes to reinstall the dial indicator to measure the displacement after the assembly of each stage of the impeller, and the accuracy of human judgment is poor, which not only wastes time, manpower and material resources, but also causes damage equipment risk

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