Thermostatically controlled electric heating device for motor vehicle glass washing fluid
First Claim
1. Heating device for the glass washing fluid of motor vehicles and the like, consisting of at least one plate-like body element in which a spiral channel is made, said channel having two communications with the outside, namely an inlet and an outlet, said channel being sealingly closed by a plate cover, a heating element being externally superposed to said plate in heat exchange relation to heat the fluid to a desired temperature and consisting of a PTC (Positive Temperature Coefficient) thermistor, and adapted to be connected through a suitable switch to the two poles of the motor vehicle battery, a thermostat connected in series with the thermistor and arranged on the plate cover so as to be responsive to the temperature thereof, wherein the thermistor is calibrated to reach a temperature substantially higher than said desired temperature and said thermostat is activated at the desired temperature, the channel inlet adapted to be connected to a line coming from the washing fluid reservoir provided with a pump, and the channel outlet adapted to be connected to spraying nozzles, so that water enters the inlet cold and goes out warm from the outlet.
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Abstract
An electric heating device for heating motor vehicle glass washing fluid includes a pair of plate-like non-metallic body elements each having a spiral channel formed therein and sealingly closed by a copper cover plate. The cover plates are juxtaposed and sandwiched therebetween an electric heating element in the form of a PTC thermistor connected to the vehicle battery through a suitable switch. A thermostat is connected in series with the thermistor and is mounted on and responsive to the temperature of one of the cover plates. The thermistor is calibrated to reach a temperature substantially higher than the desired fluid temperature to ensure rapid heating of the fluid and the thermostat as activated at the desired fluid temperature to prevent overheating of the fluid. The spiral channels are connected in series at one end and the opposite ends thereof are connected, respectively, to a washing fluid reservoir and spray nozzles for spraying heated fluid on the vehicle glass. The fluid being heated may be pumped through the spiral channels by a pump mounted on the device and having an impeller located in a chamber formed in one of the body elements.
100 Citations
10 Claims
- 1. Heating device for the glass washing fluid of motor vehicles and the like, consisting of at least one plate-like body element in which a spiral channel is made, said channel having two communications with the outside, namely an inlet and an outlet, said channel being sealingly closed by a plate cover, a heating element being externally superposed to said plate in heat exchange relation to heat the fluid to a desired temperature and consisting of a PTC (Positive Temperature Coefficient) thermistor, and adapted to be connected through a suitable switch to the two poles of the motor vehicle battery, a thermostat connected in series with the thermistor and arranged on the plate cover so as to be responsive to the temperature thereof, wherein the thermistor is calibrated to reach a temperature substantially higher than said desired temperature and said thermostat is activated at the desired temperature, the channel inlet adapted to be connected to a line coming from the washing fluid reservoir provided with a pump, and the channel outlet adapted to be connected to spraying nozzles, so that water enters the inlet cold and goes out warm from the outlet.
Specification