Patent ID: 11891862
Assignee: WEIZHUO PETROTECH (BEIJING) LTD
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. An electromagnetic clearance joint, comprising a mandrel and a shell, wherein an inner diameter of the shell is larger than an outer diameter of the mandrel, the mandrel comprises a first structure part and a second structure part which are connected to each other, and the shell comprises a third structure part and a fourth structure part which are connected to each other;
a plurality of acting grooves are formed in the first structure part, and a thread is arranged on an inner surface of each of the plurality of acting grooves; the plurality of acting grooves are uniformly and circumferentially distributed around the first structure part;
an outer diameter of the first structure part is gradually reduced in a direction close to the second structure part, an outer surface of the second structure part is provided with a plurality of annular ridges sequentially distributed in a length direction of the mandrel, and ridge structures are formed by the plurality of annular ridges; a plurality of grooves extending in a length direction of the ridge structures are formed in outer surfaces of the ridge structures, and the plurality of grooves are uniformly and circumferentially arrayed around the ridge structures;
the mandrel is matched with the shell, and in an assembled state, the first structure part is in clearance fit with the third structure part, and the second structure part is in clearance fit with the fourth structure part;
during assembling, the plurality of grooves of the mandrel are aligned with a ridge structures of the shell so that the mandrel is capable of be inserted into the shell, the mandrel is screwed such that the acting grooves of the mandrel are matched with acting grooves of the shell to form positioning threaded holes, the plurality of grooves of the mandrel are aligned with grooves of the shell to form assembly spaces, and the ridge structures of the mandrel are matched with the ridge structure of the shell to form corrugated pipe-shaped spaces; and
the positioning threaded holes are configured for receiving first insulation limiting structures made of a first non-conductive material, the assembly spaces are configured for receiving second insulation limiting structures made of a second non-conductive material, and the corrugated pipe-shaped spaces is configured for being filled with an insulating material;
wherein two first glue injection holes are formed in an outer wall of the shell, and two second glue injection holes are formed in an outer wall of the mandrel;
the two first glue injection holes are formed in a length direction of the shell at intervals, and
the two second glue injection holes are formed in the length direction of the mandrel at intervals;
the two second glue injection holes are positioned between the two first glue injection holes; and
the first glue injection holes penetrate through the shell, and the second glue injection holes do not penetrate through the mandrel.