INSULATION TREATMENT METHOD FOR HELIUM INLET PIPE OF SUPERCONDUCTING MAGNET

Abstract

Disclosed is an insulation treatment method for a helium inlet pipe of a superconducting magnet. The superconducting magnet has a structure with varying T-shaped cross section. The irregular parts of the magnet are filled with G10 to reduce the difficulty in the insulation treatment caused by the irregular shape. Moreover, a skirt-shaped insulating material is provided around the metal conduit to overcome the reduction in the insulation electrical performance caused by the defects in the insulation treatment for such irregular parts. The application designs a sample structure for insulation treatment, and can wrap the superconducting magnet having the T-shaped varying cross-section with insulating materials before vacuum pressure impregnation, meeting special requirements of high-voltage insulation treatment for the superconducting magnet with a complex structure under low temperature and vacuum environment.

Claims

1. An insulation treatment method for a helium inlet pipe of a superconducting magnet, comprising: welding an end of a metal conduit to an outer surface of a superconducting conductor; wrapping an outer surface of the metal conduit with a composite insulating tape; covering the outer surface of the superconducting conductor with fiberglass cloth; filling spaces around a junction between the metal conduit and the superconducting conductor with G10, and fixing the G10 to the metal conduit and the superconducting conductor with a binding tape; covering the G10 with a skirt-shaped insulating material with the metal conduit as a center; and fixing the skirt-shaped insulating material to the metal conduit and the superconducting conductor with the binding tape; wherein the binding tape is made of a composite insulating material.

2. The insulation treatment method of claim 1, wherein the composite insulating tape, the binding tape and the skirt-shaped insulating material are all made of a composite material of the fiberglass cloth and a polyimide film; and the G10 is a composite material composed of fiberglass and epoxy resin.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 shows the structure designed in an insulation treatment method for a helium inlet pipe of a superconducting magnet according to the present application.

[0018] FIG. 2 shows the fitting of a skirt-shaped insulating material according to the present application.

[0019] In the drawings: 1, metal conduit; 2, superconducting conductor; 3, fiberglass cloth; 4, composite insulating tapes; 5, G10; 6, binding tapes; and 7, skirt-shaped insulating material.

DETAILED DESCRIPTION OF EMBODIMENTS

[0020] This application provided an insulation treatment method for a helium inlet pipe of a superconducting magnet, and a structure involved therein was shown in FIGS. 1 and 2. The method was specifically implemented as follows.

[0021] 1) A metal conduit 1 is welded to a superconducting conductor 2.

[0022] 2) Fiberglass cloth 3 is attached to a surface of the superconducting conductor 2.

[0023] 3) The metal conduit 1 is wrapped with a composite insulating tape 4.

[0024] 4) Spaces around a junction between the metal conduit 1 and the superconducting conductor 2 are filled with G10 5.

[0025] 5) The G10 5 is fixed by winding with a binding tape 6.

[0026] 6) The G10 5 around the metal conduit 1 is covered with a skirt-shaped insulating material 7, which is fixed by winding with the binding tape 6.

[0027] 7) Step (6) is repeated to obtain the desired dielectric strength.

[0028] 8) The part obtained in step (7) is subjected to insulation curing through vacuum pressure impregnation.

[0029] 9) A dielectric withstand voltage test is performed on the part.

[0030] The composite insulating tape 4, the binding tape 6 and the skirt-shaped insulating material 7 are all made of a composite material of the fiberglass cloth and a polyimide film; and the G10 is composed of fiberglass and epoxy resin.