JPS54150748A - Sheath heater unit manufacturing method - Google Patents
Sheath heater unit manufacturing methodInfo
- Publication number
- JPS54150748A JPS54150748A JP5971678A JP5971678A JPS54150748A JP S54150748 A JPS54150748 A JP S54150748A JP 5971678 A JP5971678 A JP 5971678A JP 5971678 A JP5971678 A JP 5971678A JP S54150748 A JPS54150748 A JP S54150748A
- Authority
- JP
- Japan
- Prior art keywords
- silicone rubber
- sheath heater
- low
- melting
- point glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
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°C. After this, while the surface temperature of metal pipe 12 is maintained approximately at 50°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.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5971678A JPS54150748A (en) | 1978-05-18 | 1978-05-18 | Sheath heater unit manufacturing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5971678A JPS54150748A (en) | 1978-05-18 | 1978-05-18 | Sheath heater unit manufacturing method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54150748A true JPS54150748A (en) | 1979-11-27 |
JPS616987B2 JPS616987B2 (en) | 1986-03-03 |
Family
ID=13121198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5971678A Granted JPS54150748A (en) | 1978-05-18 | 1978-05-18 | Sheath heater unit manufacturing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54150748A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0185981U (en) * | 1987-11-25 | 1989-06-07 |
-
1978
- 1978-05-18 JP JP5971678A patent/JPS54150748A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS616987B2 (en) | 1986-03-03 |
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