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2. 发明专利

JPS54150748A SHEATH HEATER UNIT MANUFACTURING METHOD 失效
公开(公告)号：JPS54150748A
公开(公告)日：1979-11-27
申请号：JP5971678
申请日：1978-05-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KUBO TSUTOMU , MATSUNO HIROSHI , EIMIYA NOBUYUKI , OKAMOTO TAKAMITSU , KIKUMOTO ISAO , NEGORO KENTA
IPC分类号： H05B3/04 , H05B3/52
摘要： PURPOSE:To prevent the lowering of insulation resistance due to the absorption of moisture by insulators inside a tube, through cracks of glass, by producing cracks in low-melting-point glass which seals the open end of a sheath heater, and subsequently by injecting a secondary sealing agent. CONSTITUTION:The opening end of metal pipe 12 of a sheath heater in which heater terminal 11 and insulator 13 are provided, is primarily sealed with low- melting point glass 14. Next, fine cracks 15 are produced in the low-melting-point glass by heating it by an electric furnace to about 280 to 350 deg.C. After this, while the surface temperature of metal pipe 12 is maintained approximately at 50 deg.C or above, a secondary sealing is given by using silicone rubber 16. Next, during the time in which silicone rubber solidifies, a lead metal is spot-welded to terminal 11, and then this lead metal is cooled in the atmosphere and silicone rubber 16 is let natural solidification.

6. 发明专利

JPS63291385A SHEATH HEATER 失效
公开(公告)号：JPS63291385A
公开(公告)日：1988-11-29
申请号：JP12623187
申请日：1987-05-22
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： OHASHI HIDEYUKI , EIMIYA NOBUYUKI
IPC分类号： H05B3/10 , H05B3/48
摘要： PURPOSE:To improve the moisture resistance and reduce the production cost by impregnating silicone oil into a heating wire and the electric insulating powder in a metal pipe, then heating and gelatinizing them, and applying the annealing heat treatment at the specific temperature. CONSTITUTION:A heating wire 2 is inserted into a metal pipe 3, the electric insulating powder 4 is filled, silicone oil is impregnated, the pipe is rolled and shrunk in diameter and heated to gelatinize the oil. The annealing heat treatment is applied in a short time at the temperature of 800 deg.C or more by the current feed directly to the pipe 3 or the high-frequency induction, As a result, no carbide is generated inside, the silicone oil is decomposed and reacted with the powder 4 to form a moisture-resistant reaction layer. The gelatinized oil is not decomposed and has water repellency, and the insulation deterioration is prevented. A heater excellent in insulation resistance and moisture resistance can be produced at a low cost without requiring glass sealing.

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