At present, thick film heater has been widely used in various heating fields, such as: water heater; Its structure consists of water flow region, thick film heating region and temperature sensing NTC (negative temperature coefficient;
Such as: negative temperature coefficient thermistor), water area and outlet, including water entry temperature sensor NTC set on water area or thick film heating area, temperature sensing NTC according to using need, can include the dry and water induction, but the structure of the thick film heater still has the following disadvantages: (1) the temperature NTC sensor, when use, easily affected by damp and long-term electricity environment, NTC work instability, and even cause anomalies.
Technical implementation elements:
The purpose of the utility model is to overcome the shortcomings of the above existing technologies and provide a thick film heater which is easy to implement and the temperature sensing NTC works stably.
The purpose of the utility model is thus realized.
A thick film heater comprises a water flow area, a thick film heating area and a temperature sensing NTC. The water flow area comprises an inlet and an outlet. The temperature sensing NTC is set on the water flow area or a thick film heating area. This thick film heater is equipped with an insulating moisture-proof layer on the temperature sensing NTC to prevent the influence caused by the humid environment and long-term electrification environment, making the temperature sensing NTC work stably and easy to implement
Described as a more specific solutions, water area is from down to up spiral wound extension of metal pipe, the lower end of the metal pipes for water entry, the upper outlet, thick film heating area including the tubular heat conducting plate and round in cylinder plus hotline on the surface of the heat conducting plate appearance, cylindrical heat conducting plate is clingy and BaoXia outside the metal pipes in spiral wound surface, cylindrical heat conduction on plate surface corresponding plus hotline and outlet location respectively and hotline and outlet area, dry induction NTC and water induction NTC set respectively in the cylinder plate the surface of thermal conductivity and hotline and outlet area.