ELECTRIC HEATING ELEMENT WITH THERMAL SWITCH (VERSIONS) Russian patent published in 2010 - IPC H05B3/48 H01H37/32 H01H37/76 H05B1/02 

FIELD: electricity.

SUBSTANCE: invention relates to electric heating elements intended for equipment of tubular electric heaters (THE) protected against overheating. Four versions of electric heating element design with thermal switch are proposed, where the element comprises heater made of metal wire with high specific electric resistance, in the form of helical spatial spiral, and thermal switch, having thermal link arranged in the form of tube from fusible metal alloy and compensator made of metal wire with high specific electric resistance. In the first version of design thermal switch comprises electric terminal made of metal wire, end of which is connected to end of thermal link, and contact made from metal tube, end of which is partially placed onto other end of thermal link and is connected to it. Compensator of thermal switch is arranged in the form of stepped spatial spiral, narrowed part of which is introduced into other end of contact and is connected to it. Electric terminal is introduced with its other end to end part of heater and is connected to it. In the second version of design thermal link is partially inserted by its one end into end portion of compensator at the side of turns connected to each other and is connected to it, by its other end it is connected to electric terminal. Electric terminal is introduced with its other end to end part of heater and is connected to it. In the third version of design thermal link is partially inserted by its one end into end portion of compensator, and is connected to it, by its other end it is connected to electric terminal end. By its other end electric terminal is introduced into end part of heater and is connected to it. In the fourth version of design thermal link of thermal switch is arranged as closed at one end, other end of thermal link is inserted into end part of compensator and is connected to it. End of heater is placed onto closed end of thermal link and is connected to it.

EFFECT: simple design of device, lower labour intensiveness of device making, small time of thermal switch actuation.

10 cl, 35 dwg