An assembly method of a vortex speed limiter for a high temperature gas-cooled reactor

Abstract

An assembly method for the eddy current governor of a high-temperature gas-cooled reactor. After putting the permanent magnet into the cladding, it is pushed horizontally from the edge of the end cover to the installation area. The keyway on the cladding and the boss in the spacer are installed correspondingly, so that The positioning of the magnet is more accurate, and the fixation is more stable, which solves the problem that the installation position of the permanent magnet is offset and cannot be installed due to mutual attraction. A constant force is applied to the end cover to keep the center of the end cover and the center of the damping disc on the same axis Assembling on the surface, and by setting the end cover adjustment pad with high thickness accuracy, better grasping the distance between the permanent magnet and the damping disc, can avoid the scrapping of the permanent magnet and other parts due to collision.

Description

technical field [0001] The invention relates to a control rod eddy current governor of a high temperature gas-cooled reactor, in particular to a method for assembling the eddy current governor. Background technique [0002] The eddy current governor is an important part of the high temperature gas-cooled reactor. In order to limit the accidental rod drop speed, to meet the needs of the chain mechanism, and to reduce the impact of the free-fall rod on the driving mechanism, it can ensure that the chain does not drop due to accident. Broken, the maximum accident drop speed after the speed limit of the eddy current speed limiter does not exceed 0.5m / s. Since there are 12 permanent magnets (Nd-Fe-B) in the eddy current speed limiter, the interaction force of a pair of permanent magnets (Nd-Fe-B) is about 980-1000N. During the installation process of the eddy current speed limiter Among them, due to the interaction of 6 pairs of permanent magnets, a maximum force of about 6000N ...

AI Technical Summary

Problems solved by technology

Since there are 12 eddy current governor permanent magnets (Nd-Fe-B) in the eddy current governor, the interaction force of a pair of permanent magnets (Nd-Fe-B) is about 980 ~ 1000N, during the installation process of the eddy current governor Among them, due to the interaction of 6 pairs of permanent magnets, a maximum force of about 6000N can be generated, so the general installation method cannot meet the assembly requirements

Due to the uncontrollability during the installation process, the permanent magnets will attract each other, so that the components will be scrapped. At present, there is no effective installation method to install the eddy current speed limiter conveniently, efficiently and safely.

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