Electronic heater for an aquarium

Details Electronic heater for an aquarium Electronic heater for an aquarium

1998-07-10

2000-05-09

Walberg, Teresa

Electric resistance heating devices

Heating devices

Immersion heater details

219523, 119262, H05B 102, H05B 306, A01K 6304

Patent

active

060615001

ABSTRACT:
An electronic heater structure includes a tube body, a heating wire disposed on the bottom of the interior of the tube body and a temperature controlling circuit. The temperature controlling circuit employs a thermosensitive resistor for detecting the temperature and controlling the activation time of the heating wire. The temperature controlling circuit employs a relay for controlling whether the heating wire is powered on or off. An upper cap of the tube body is integrally formed with a projecting chamber for placing a thermosensitive resistor therein. The relay and the thermosensitive resistor are isolated from each other by a circuit board. The tube body is vacuumized to remove the thermoconductive medium therein. Except for the heating wire, the temperature controlling circuit itself will not generate high heat and emit electro-magnetic interference and the detection portion with the thermosensitive resistor can extend into the water to accurately detect the water temperature.

REFERENCES:
patent: 3564589 (1971-02-01), Arak
patent: 4327281 (1982-04-01), Jager et al.
patent: 4812626 (1989-03-01), Strada
patent: 4983813 (1991-01-01), Van Tulleken et al.
patent: 5020128 (1991-05-01), Bleckmann
patent: 5113057 (1992-05-01), Tsai
patent: 5568587 (1996-10-01), Marioni
patent: 5834741 (1998-11-01), Tseng
patent: 5905849 (1999-05-01), Ito

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