A connection structure between a detachable upper pipe seat and a guide pipe

Abstract

The invention provides a detachable upper pipe seat and guide pipe connecting structure which comprises an upper pipe seat, an elastic joint and a bracing pipe, wherein a guide pipe hole is formed in the upper pipe seat; the inner diameter of the upper part of the guide pipe hole is larger than the inner diameter of the lower part of the guide pipe hole so as to form a stepped surface; the elastic joint is of a tubular structure; the upper part of the elastic joint comprises at least two elastic fasteners; grooves are formed in the inner sides of the elastic fasteners along the peripheral direction; a lug boss is formed on the lower end of the elastic joint, is matched with the lower end surface of the guide pipe hole of the upper pipe seat and is used for limiting the upward motion of the elastic joint; the bracing pipe is of a tubular structure, a bulge is formed in the outer side of the upper part of the bracing pipe along the peripheral direction, and the bulge is embedded in the grooves of the elastic fasteners; and the bracing pipe is used for locking the elastic fasteners on the stepped surface of the guide pipe hole and limiting the downward motion of the elastic joint. According to the upper pipe seat and guide pipe connecting structure disclosed by the invention, the bracing pipe is taken out by using a hooking tool, and after the elastic joint is not supported, the elastic joint is pressed into the guide pipe hole, the upper pipe seat can be taken out, and the connecting structure can be repeatedly mounted and detached.

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 novel connection structure between a detachable upper tube seat and a guide tube. Background technique [0002] The core of a pressurized water reactor is generally composed of many fuel assemblies arranged in sequence, and the fuel assembly of a pressurized water nuclear reactor is usually composed of a number of fuel rods, guide pipe parts, instrument pipe parts, grids, upper and lower pipe seats, etc. [0003] The grids are generally divided into top support grids, middle support grids and bottom support grids. These support grids hold the fuel rods inserted therein and play a supporting role. The top support grid, the middle support grid and the bottom support grid are connected with the guide tube parts by mechanical connection or welding. Through these connections the weight of the fuel rods is transferred to...

AI Technical Summary

Problems solved by technology

However, threaded connections are difficult to process and difficult to install and disassemble

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