Electrical devices with water-blocking insulation

Details Electrical devices with water-blocking insulation Electrical devices with water-blocking insulation

1982-09-15

1984-03-06

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

With heating unit structure

174 22C, 174 23R, 219528, 219553, 338 22R, 338214, H05B 356

Patent

active

044356390

ABSTRACT:
Permeation of water between inner and outer insulating jackets of an elongate electrical heater or other device along a metallic braid between the jackets is limited by means of a water-blocking section. The water-blocking section is generally placed near the connected end of the device to prevent water from reaching the connection. In the water-blocking section, the outer jacket is removed and an insulating sleeve, preferably a heat-shrunk polymeric sleeve, is placed over the exposed length of the inner jacket and the ends of the outer jacket. A water-proof sealing material is placed between the sleeve and part only of the exposed inner jacket. In this way, water which permeates between the jackets to the water-blocking section is prevented from passing through the section but is permitted to escape from the device.

REFERENCES:
patent: 3657520 (1972-04-01), Ragault
patent: 3691505 (1972-09-01), Graves
patent: 4242573 (1980-12-01), Butliwalla
patent: 4288144 (1981-09-01), Nakai et al.

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