Working principle and characteristics of PTC heater

19 Mar.,2024

 

Working Principle and Characteristics of PTC Heater

 

PTC Heater

 

PTC heater, also called PTC heater, using PTC ceramic heating elements and aluminum tube composition. This type of PTC heater has the advantages of small thermal resistance, heat transfer, is an automatic constant temperature, power-saving electric heater. The outstanding feature is that, in terms of performance, when the fan fails to turn, the power of the PTC heater will automatically drop sharply due to insufficient heat dissipation, the surface temperature of the heater is maintained at around Curie temperature (usually around 250 â ° C) , which prevents the surface of a heater such as an electric heat pipe from becoming "Red" and thus causing, for example, a fire.

 

The utility model is composed of a radiating aluminum sheet, an aluminum tube, a conductive sheet, an insulating film, a PTC heating sheet, a nickel-plated copper electrode terminal and a high-temperature plastic electrode sheath. Due to the use of compression-type heat sink, the product has improved its heat dissipation rate, and fully take into account the PTC heating parts in the work of a variety of thermal and electrical phenomena, its strong binding force, heat conduction, heat dissipation performance is excellent. This type of PTC heater has the advantages of small thermal resistance, heat transfer, is an automatic constant temperature, power-saving electric heater.

 

PTC Heater Principle

 

The principle of the constant temperature heating PTC thermistor is that the resistance value enters the jump zone when the PTC thermistor is heated, and the surface temperature of the constant temperature heating PTC thermistor will keep a constant value, this temperature is only related to the Curie temperature and applied voltage of the PTC thermistor, and is largely independent of the ambient temperature. PTC heater is a kind of heating device designed by the constant temperature heating characteristic of PTC thermistor. On the occasion of medium and small power heating, PTC heater has many advantages over traditional heating elements such as constant temperature heating, no open flame, high heat conversion rate, influence of power supply voltage, long natural life, etc. , more and more engineers are interested in the application of electric heating appliances.

 

PTC heaters are divided by conduction mode

 

(1) PTC Ceramic Heater based on heat conduction. It is characterized by multi-layer heat transfer structure, such as electrode plate (electric conduction and heat transfer) insulation layer (electric insulation and heat transfer) heat conduction and heat storage plate (some with heat conduction adhesive) , which is installed on the surface of PTC heating element, the heat from the PTC element is transferred to the heated object.

 

(2) all kinds of PTC ceramic hot air heater with the formed hot air for convective heat transfer. The utility model is characterized in that the output power is large, and the blowing air temperature and the heat output can be adjusted automatically.

 

(c) infrared radiator. Its characteristics are that the heat emitted from the surface of PTC element or heat conducting plate can directly or indirectly excite the far-infrared coating or far-infrared material that touches the surface of PTC element or heat conducting plate to make it radiate infrared rays, pTC ceramic infrared radiator.

 

PTC heater according to the structural characteristics

 

(1) common practical PTC ceramic heater. This kind of appliance mainly has: the electric heating mosquito repellent, the hand warmer, the dryer, the electric heating plate, the electric iron, the electric iron, the electric heating adhesive, the curling perm and so on. It is characterized by low power, but very practical heat.

 

(2) automatic thermostatic PTC heater. This kind of apparatus mainly has: the small crystal device constant temperature trough, the constant temperature incubator, the electronic heat preservation bottle, the heat preservation box, the Heat Preservation Cup, the Heat Preservation Plate, the heat preservation cabinet, the heat preservation table and so on. The utility model has the advantages of automatic heat preservation, simple structure, good constant temperature characteristic, heat and wide range of environmental temperature for use.

 

(3) PTC heater with hot air. This kind of hot air PTC heater are: small warm air heater, hair dryer, greenhouse machine, dryer, dry wardrobe, dryer, industrial drying equipment. The utility model is characterized in that the output hot air power is large, the heat is fast, and the air temperature and the power consumption can be adjusted automatically.

 

PTC air heater can overcome the shortcomings of electric wire heater, insulation voltage, leakage current, insulation resistance excellent and stable, no wind ventilation, automatic protection, will not catch fire combustion, long service life. But if the PTC heater is made of poor quality, there may also be problems: first, the PTC ceramic body breaks down and burns out, causing a short circuit and burning out the insulation layer; second, the heating power decreases with the increase of service time, failure to achieve expected service life.