Nuclear reactor coolant pump shaft sleeve installation technology

Abstract

The invention relates to a nuclear reactor coolant pump shaft sleeve installation technology. A mounting disc capable of being leveled, a long screw rod and a connecting nut are adopted to perform overall levelling and lifting on a shaft sleeve, guide tools are adopted in the bearing falling process for guiding, the position precision in the shaft sleeve falling process is ensured, and the shaft sleeve and a lower pump shaft are prevented from being scratched; and after the shaft sleeve falls by a certain depth, the screw rod and the nut do work on a pressing disc, it is ensured that the shaftsleeve is smoothly assembled to the shaft shoulder position of the lower pump shaft after falling, and the shaft sleeve is smoothly installed and positioned. According to the process, the problems that in the installation process of the nuclear reactor coolant pump shaft sleeve, shaking occurs, two workpieces cannot be ensured to be concentric, the sight is shielded, accurate positioning operation cannot be realized, and scratches and grooves are generated in the assembly process are solved, and the technology can also be applied to the field of installation technologies of other long-cylinder thin-walled parts.

Description

Technical field: [0001] The invention relates to a process for installing a shaft sleeve of a nuclear reactor coolant pump. Background technique: [0002] The shaft sleeve is the primary part of the reactor's main pump core. The shaft sleeve is 1200mm long and 14mm thick. It is a special long-tube thin-walled part. The entire shaft system components are located in the sealed body, and the rotation speed is 1486 rpm under the normal operation of the main pump. The shaft sleeve also supports the water guide bearing. When the main pump is running, the water temperature in the sealed chamber is as high as 293 degrees Celsius. The shaft sleeve is installed on the lower pump shaft to protect and heat the lower pump shaft. Since the cylindricity of the sleeve is 0.01mm, the total runout of the outer circle is 0.02mm, the coaxiality between the inner circle is 0.01mm, and the theoretical clearance with the lower pump shaft is 0.02-0.05mm, and the clearance with the water guide bearing i...

AI Technical Summary

Problems solved by technology

[0003] First: If there is a radial movement deviation during the installation and falling of the shaft sleeve, there will be a scratch between the shaft sleeve and the lower pump shaft, which will cause the shaft sleeve to deform and be scrapped, and the chrome-plated surface of the lower pump shaft will fall off

[0004] Second: If the shaft sleeve is not positioned correctly at the lower pump shaft, the shaft sleeve will fall off and damage the water guide bearing due to the high speed during the operation of the main pump

[0005] At present, there is no precedent for the manufacture of nuclear reactor coolant main pumps in China, and there is no experience to learn from. We need to continue to explore and research, and invent a reasonable shaft sleeve installation process.

Images