Connecting structure of limit type upper tube seat and guide tube

Abstract

The invention provides a connecting structure of a limit type upper tube seat and a guide tube. The connecting structure comprises an upper tube seat, a rigid joint and a limit tube, wherein a guide tube hole is formed in the upper tube seat, the inner diameter of the upper part of the guide tube hole is greater than that of the lower part of the guide tube hole, and a stepped plane is formed; the rigid joint comprises an insertion section and a bearing boss, wherein the insertion section is arranged at the upper part of the rigid joint, and the bearing boss is arranged at the lower part of the rigid joint; at least one position clamping block is arranged on the outer side of the insertion section, the bearing boss is used for limiting the upward movement of the rigid joint, and a guide tube connecting end is arranged at the lower end of the bearing boss and is used for connecting the guide tube; the limit tube is arranged between the upper tube seat and the rigid joint and is located above the stepped plane; at least one limit bulge is arranged at the lower end of the inner side of the limit tube and is used for limiting the downward movement of the position clamping block of the rigid joint. According to the connecting structure of the limit type upper tube seat and the guide tube, the guide tube and the upper tube seat can be disconnected by virtue of the rigid joint and the limit tube, so that the mounting and the dismounting are benefited, and the upper tube seat and the guide tube can be repeatedly dismounted and mounted.

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 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 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 the guide tube part, which will take up the axial load...

AI Technical Summary

Problems solved by technology

However, the threaded connection is difficult to process, and it is very difficult to install and disassemble in a limited space

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