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US 4,593,182 AGranted
Electric cartridge heater
AssigneeHotset Heizpatronen und Zubehor GmbH
InventorEugen Schwarzkopf
Life of this patent
Estimating the term…
Abstract
A cartridge heater includes an inner casing in which a heating element is accommodated. This inner casing is surrounded by an coaxially arranged outer casing of larger diameter so that an annular space is defined between the inner and outer casings. In the space a helical coolant piping is arranged, embedded in a highly heat-conductive substance of granular and/or pulverulent form so as to allow excess heat to be carried away.
Claims13
An electric cartridge heater comprising:
- an inner casing of heat conductive material having a longitudinal axis;
- an elastic heating coil within said inner casing extending along said axis;
- a compacted body of granular heat conductive but electrically insulating material surrounding said coil and filling said inner casing;
- an outer casing of heat conductive material surrounding said inner casing and defining an annular space therewith;
- a cooling-tube coil in said space surrounding said inner casing for carrying away excess heat and in contact with at least one of said casings and in thermally conductive relationship with both casings;
- and
- a compacted mass of thermally conductive granules filling said space between the turns of said cooling-tube coil.
4 more elements
A cartridge heater as defined in claim 2 wherein said conductive granules are at least predominantly copper.
Dependencies are inferred from the claim text.