A plugging tool for heat transfer pipes of heat exchangers used in nuclear power

Abstract

The invention provides a heat-transfer pipe blocking tool of a nuclear power heat exchanger. The heat-transfer pipe blocking tool comprises a support and a driving system. The support is hinged to two operation rods. The support is provided with a top plate. The top plate is provided with a through hole. The support is provided with a hydraulic oil cylinder. The lower end of the hydraulic oil cylinder is connected to a connection plate. The driving system comprises a motor and a cylinder. The motor is connected to a vertical pull bar through a transmission mechanism. The pull bar goes through the through hole of the top plate of the support. The top end of the pull bar is provided with outside threads. The cylinder is connected to the connection plate. In cylinder work, the connection plate drives the pull bar to move up and down. A displacement measurement device is arranged between the support and the connection plate. An operator manually puts the tool into a small heat exchanger through a head so that a pipe blocking process is finished. The tool has a small volume and light weight, can be operated simply and is easy to learn and use.

Description

Technical field [0001] The invention relates to a heat transfer tube plugging tool of a heat exchanger for nuclear power. Background technique [0002] In nuclear power plants, the use of heat exchangers is very common. The heat exchangers include shells, heat transfer tubes, etc. The heat transfer tubes are in the shell, that is, inside the heat exchanger. The heat transfer tube in the heat exchanger is a water flow channel, and each heat transfer tube cooperates to form multiple loops, and the heat transfer tube is always washed by the water flow during use. As the time of use in nuclear power plants increases, the heat transfer tube will produce defects such as tube wall thinning, wear, pits, stress corrosion, and intergranular corrosion. When these defects are serious, the heat transfer tube will leak and cause the heat exchanger to leak. The secondary circuit is radioactively contaminated, so it is necessary to seal the defective heat transfer tube in time. [0003] In the c...

AI Technical Summary

Problems solved by technology

[0003] In the current field of nuclear power, there are already heat transfer tube plugging tools specifically for nuclear power plant heat exchangers, but this type of plugging tool has a complex structure, difficult operation, long learning time for operators, and heavy workload when plugging tubes. Larger, requires a higher number of operators, and is primarily used for large heat exchangers

For some small heat exchangers, the existing pipe plugging methods are difficult to meet the work requirements, because the small heat exchangers have limited operating space, and most of the current methods are time-consuming and laborious, and the working effect of the pipe plugging methods used is also low. It is not ideal, so there is a need for a heat transfer tube plugging tool for heat exchangers that can reduce the operator's work intensity and improve work efficiency

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