Electric resistance heating devices – Heating devices – Tank or container type liquid heater
Patent
1992-10-19
1995-02-07
Paschall, Mark H.
Electric resistance heating devices
Heating devices
Tank or container type liquid heater
219497, 219492, 219508, 219437, 392442, 392455, 392451, 68 15, 340589, H05B 102, D06F 3302
Patent
active
053881788
ABSTRACT:
A safety control system for a boiling clothes washing machine has paired wash water temperature detecting devices and heater temperature detecting devices, for accurately detecting and controlling the temperature of the wash water, and for preventing the heater from overheating. One embodiment of the system, for use in a washing machine including a wash water heater, includes a first water temperature detector for detecting the temperature of wash water by means of direct contact with the wash water; a second water temperature detector for detecting the temperature of wash water by means of direct contact with the wash water; and a circuit, responsive to the second water temperature detector, for controlling the operation of the heater during an abnormal operation of the first water temperature detector. The control system also includes a first heater temperature detector, mounted in a thermally conductive relationship with the heater, for detecting the temperature of the heater; a second heater temperature detector, mounted in a thermally conductive relationship with the heater, for detecting the temperature of the heater; and a circuit, responsive to the second heater temperature detector, for controlling the operation of the heater during an abnormal operation of the first heater temperature detecting means. The control system further includes a processor responsive to the first heater temperature detector, for determining a heater temperature gradient, and for cutting off a power source to the heater in response to the temperature gradient being greater than a reference temperature gradient value.
REFERENCES:
patent: 3614385 (1971-10-01), Horstmann
patent: 4405855 (1983-09-01), Kolle et al.
patent: 4580421 (1986-04-01), Babuin et al.
patent: 4668856 (1987-05-01), Axelson
patent: 4752671 (1988-06-01), Foster et al.
patent: 4929930 (1990-05-01), Rezabek
patent: 5099108 (1992-03-01), Kimura et al.
Paschall Mark H.
Samsung Electronics Co,. Ltd.
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