Electrical heater for media, particularly flow heater
AssigneeE.G.O. Elektro-Gerate Blanc u. Fischer
InventorsWilli Kralik, Siegbert Berger, Franz Bogdanski, Peter Stupp, Werner Koegel
Life of this patent
Estimating the term…
Abstract
A flow heater (11) has a stainless steel tube (1Z), around which is externally placed a polyimide (KAPTON) insulating film (14) with an overlap (15). Under pretension is wound onto the same a metallic resistance material heating tape (17), so that the resulting elasticity reserve, also at operating temperature, ensures a good application of the heating tape to the film. Temperature switching devices for preventing excess temperatures or running dry can be fitted in the overlap area (15).
Claims24
An electric heater for media, comprising:
- a tubular body having a wall with an inside surface and an outside surface;
- at least one electric heating element heating a heated area applied to the outside of the wall;
- a film-like electrical insulation disposed between the outside of the wall and the at least one heating element;
- and
- contact maintaining means for maintaining a contact of the at least one heating element to the wall outside surface by pretension of the at least one heating element creating an elasticity reserve of the at least one heating element relative to the wall despite a temperature-caused expansion difference in the area between the wall and the at least one heating element.
An electric heater for media, comprising:
- a tubular body having a wall with an inside and an outside surface;
- at least one electric heating element for heating a heated area applied to the outside of the wall;
- and
- a film-like electrical insulation disposed between the outside of the wall and the at least one heating element, the insulation including an un-reinforced plastic film being wound in at least one layer in overlapping manner onto the outside surface of the wall, the heating element including at least one flat tape of metallic resistance material, whose flat sides engage on the plastic film insulation, and being wound in uninsulated and unjacketed manner substantially directly and in helical manner onto the insulation.
An electric heater for media, comprising:
- a tubular body having a wall with an inside and an outside surface;
- at least one electric heating element for heating a heated area applied to the outside of the wall;
- and
- a film-like electrical insulation disposed between the outside of the wall and the heating element, said heating element including at least one connection piece fitted to the tubular body for connecting the heating element to an electrical power supply and further comprising an excess temperature protection device, being incorporated in the connection piece and operationally thermally but indirectly coupled to the heating element.
An electric heater for media, comprising:
- a tubular body having a wall with an inside and an outside surface;
- at least one electric heating element for heating a heated area applied to the outside of the wall;
- a film-like electrical insulation disposed between the outside of the wall and the heating element, the heating element comprising at least one flat tape of metallic resistance material, whose flat sides engage on the insulation, the heating element being connected at at least one of its end portions with a connector having a curved portion to which the heating element has electrical and thermal contact for heat dissipation from the heating element at the at least one end portion, the thermal contact being maintained from a point where the heating element looses contact with the wall to an end of the heating element.
Dependencies are inferred from the claim text.