Nuclear Reactor Coolant Pump Shaft Sleeve Installation Process

Abstract

The invention relates to a nuclear reactor coolant pump shaft sleeve installation process, which adopts an adjustable mounting plate, a long screw rod and a connecting nut to level and adjust the shaft sleeve as a whole, and uses guide tools to guide the bearing during the falling process to ensure that the shaft sleeve falls Position accuracy during the process and to prevent the shaft sleeve and the lower pump shaft from being scratched. After the shaft sleeve falls to a certain depth, the screw and nut are used to act on the compression disc to ensure that the shaft sleeve is smoothly assembled on the shaft shoulder of the lower pump shaft after falling, thereby Complete the smooth installation and positioning of the shaft sleeve. The invention solves the problems of swaying during the installation of the main pump shaft sleeve, failure to ensure concentricity of the two workpieces, inaccurate positioning when the line of sight is blocked, and grinding damage during the assembly process. It can also be applied to other long tube thin-walled parts. And other installation technology fields.

Description

Technical field: [0001] The invention relates to a nuclear reactor coolant pump shaft sleeve installation process. Background technique: [0002] The shaft sleeve is the primary component of the main pump of the reactor. The shaft sleeve is 1200mm long and 14mm thick. It is a special long tube and thin-walled part. The entire shafting part is located in the sealing body, and the speed of the main pump is 1486 rpm when the main pump is in normal operation. 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 insulate the lower pump shaft. Since the cylindricity of the shaft sleeve is 0.01mm, the total runout of the outer circle is 0.02mm, the coaxiality between the inner circles is 0.01mm, the theoretical gap with the lower pump shaft is 0.02-0.05mm, and the gap with the water guide bearing is 0...

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.

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