A new type of automatic positioning pipe-in-pipe connection structure and assembly method

Abstract

The invention discloses a novel automatic-positioning pipe-sleeved-pipe connection structure and an assembling method thereof. According to the structure, by cooperating an elastic buckle on an end plug of a buffer pipe with a slot on an end plug of a guide pipe, the buffer pipe can be automatically positioned in the guide pipe when being inserted into the guide pipe, and then shrinkage of the elastic buckle is limited by a screw, so that limiting of the elastic buckle on the end plug of the buffer pipe is realized, the buffer-pipe end plug is prevented from being out of the guide-pipe end plug, and finally the expanded connection between the guide pipe and the buffer pipe prevents the relative rotation of the guide pipe and the buffer pipe. The structure realizes automatic positioning of the buffer pipe in the guide pipe, the assembling operation is simplified, and production efficiency is improved.

Description

technical field

[0001] The invention relates to the field of connection structure design of pressurized water nuclear reactor fuel assemblies, in particular to a connection structure between an outer tube and an inner tube. Background technique

[0002] The pressurized water reactor fuel assembly consists of upper and lower nozzles, grids, fuel pipes, conduits, etc. Wherein, the conduit is connected to the upper and lower nozzles by mechanical connection or welding, and the conduit is connected to the grid by mechanical connection or welding. These connections determine the axial positioning of the nozzle and the grid in the fuel assembly. The fuel tubes are inserted into the grid and held in place by the grid. The above components make up the fuel assembly.

[0003] In order to realize the controllability of fuel reaction in pressurized water reactor, it is necessary to control through the insertion of control rods into the fuel assembly. The control rod impacts the fuel...

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