Hot air curtains (hot air curtains, hot air curtains) can be divided into two categories: electric heating and water heating (steam taking into account) according to the heating source. The electric air curtains use centralized heating materials such as PTC heaters, ceramic heaters, and electric heating tubes. Among them, the PTC heater is the most widely used. Compared with the other two heaters, it has a higher heating efficiency and a larger output of hot air. The latest PTC heater can achieve no charge on the surface, so it is safer. The water-heated air curtain adopts two heat sources, hot water and steam, and the heat is released through the heating sheet to heat the air. The body is heavier and larger than the electric air curtain, and requires continuous hot water and steam inflow. Installation The environmental requirements are high, because it does not use electric energy for heating, it has the characteristics of power saving and energy saving. The use of electric air curtains is more common, and the installation is relatively simple. Water heating type can also be used in places with hot water and steam sources.
The PTC thermistor has a constant temperature heating characteristic. The principle is that the PTC thermistor self-heats after being powered on to make the resistance enter the jump zone. The surface temperature of the constant temperature heating PTC thermistor will maintain a constant value. The Curie temperature of the resistor is related to the applied voltage, but basically has nothing to do with the ambient temperature.
PTC heater is a heating device designed by using constant temperature heating PTC thermistor constant temperature heating characteristics. In small and medium power heating occasions, PTC heater has constant temperature heating, no open flame, high heat conversion rate, minimal influence by power supply voltage, and long natural life. Such as the incomparable advantages of traditional heating elements, the application in electric heating appliances is more and more favored by R&D engineers. The constant temperature heating PTC thermistor can be made into a variety of shapes and structures and different specifications. Long strips, rings and honeycomb porous shapes, etc. The combination of the above-mentioned PTC heating elements and metal components can form various forms of high-power PTC heaters.
PTC heaters are divided by conduction method
(1) PTC ceramic heater based on heat conduction. Its characteristic is that the electrode plate (electrical conductivity and heat transfer) and insulating layer (electrical insulation and heat transfer) are installed on the surface of the PTC heating element. Thermal conductive glue) and other multi-layer heat transfer structures, which transfer the heat emitted by the PTC element to the heated object.
(2) Various PTC ceramic hot air heaters that use the formed hot air to conduct convective heat transfer. It is characterized by large output power, and can automatically adjust the blowing air temperature and output heat.
(3) Infrared radiant heater. Its characteristics actually use the heat quickly emitted from the surface of the PTC element or the heat-conducting plate to directly or indirectly stimulate the far-infrared paint or far-infrared material that touches its surface to radiate infrared rays, which constitutes the PTC ceramic infrared Radiant heater.
PTC heaters are divided according to structural characteristics
(1) Ordinary and practical PTC ceramic heater. This kind of appliances mainly include: electric mosquito repellent, hand warmer, dryer, electric heating plate, electric iron, electric soldering iron, electric heating adhesive, curling iron, etc. Its characteristic is that the power is not large, but the thermal efficiency is high and it is practical.
(2) Automatic constant temperature PTC heater. This kind of appliances mainly include: small crystal device constant temperature bath, constant temperature incubator, electronic thermos bottle, incubator, thermos cup, insulation tray, insulation cabinet, insulation table, etc. It is characterized by automatic heat preservation, simple structure, good constant temperature characteristics, high thermal efficiency, and wide operating environment temperature range.
(3) Hot air PTC heaters. This type of hot air PTC heaters mainly include: small warm air heaters, hair dryers, heating machines, dryers, drying wardrobes, clothes dryers, industrial drying equipment, etc. Its characteristic is output The hot air has high power, rapid heating, safety, and can automatically adjust the air temperature and power consumption.