A method for assembling an electromagnetic clearance joint, wherein, the electromagnetic clearance joint comprises 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;
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- 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 threads are arranged on inner walls of two first glue injection holes and inner walls of two second glue injection holes respectively;
- the method comprising the following steps of:
- aligning the ridge structures of the mandrel with the grooves of the shell, and aligning the plurality of grooves of the mandrel with the ridge structures of the shell;
- inserting the mandrel into the shell, and rotating either the mandrel or the shell by a predetermined angle theta, such that the acting grooves of the mandrel are matched with the acting grooves of the shell to form the positioning threaded holes, the plurality of grooves of the mandrel are aligned with the grooves of the shell to form the assembly spaces, and the ridge structures of the mandrel are matched with the ridge structures of the shell to form the corrugated pipe-shaped spaces;
- screwing the first insulation limiting structures into the positioning threaded holes;
- inserting the second insulation limiting structures into the assembly spaces to prevent the mandrel and the shell from rotating;
- connecting one of the two first glue injection holes with a vacuum device, such that the vacuum device is communicated with the corrugated pipe-shaped spaces through the two first glue injection holes, and evacuating air in the corrugated pipe-shaped spaces;
- communicating an injection device with the corrugated pipe-shaped spaces through an other first glue injection hole of the two first glue injection holes, and injecting an insulating fluid into the corrugated pipe-shaped spaces until the corrugated pipe-shaped spaces are uniformly filled with the insulating fluid;
- and
- screwing threaded fasteners into the two first glue injection holes respectively for sealing, after the vacuum device and the injection device are detached.