| 摘要 |
1,219,653. Electrically insulating couplings. EISENBAU ALBERT ZIEFLE K.G. 26 March, 1968 [15 June, 1967], No. 14442/68. Heading F2G. An electrically insulating coupling between two pipe ends 11, 12 consists of a joint welded at 19 and enclosing insulating and packing rings 16, 17 and sealing rings 18 held under pressure between a flange 11<SP>1</SP> and a collar 15 so as to enclose a flange 14 previously welded to the tube end 12, the flange 11<SP>1</SP> being previously welded to the tube end 11 and the collar 15 being previously welded to a sleeve 13, and wherein, in order to prevent damage to the rings 16-18 while making the final weld 19, a metal thermal barrier ring 1 is inserted between flange 111 and ring 16, the thermal barrier ring 1 being grooved to provide annular air spaces. The thermal barrier ring 1 is preferably welded to the face 11<SP>11</SP> of the flange 11<SP>1</SP> and O-rings 4 are disposed between the thermal barrier ring 1 and ring 16, and between ring 16 and the flange 14. A layer of epoxy resin or other material of high electrical breakdown strength is deposited on the flange 14, and the coupling is completed by an epoxy resin ring 3 at one end and a bitumen mass at the other end, each having a conical shape. |
