The blower directly drives the rotor to drive the rotor to rotate. When the vane rotates, the air is sucked in from the air inlet, and the centrifugal airflow thus formed is blown out by the front nozzle of the air cylinder. When the air passes, if the heating wire attached to the heating bracket in the tuyere is energized and heated, the hot air is blown out; if the selection switch does not cause the heating wire to be energized and heated, the cold air is blown out. The hair dryer is the purpose of drying and shaping. The selector switch on the handle of the hair dryer is generally divided into three gears, that is, the closing gear, the cold wind gear, the hot wind gear, and the signs of white, blue and red are attached. Some hair dryers are also equipped with motor speed control switches for the choice of air volume and hot air temperature. The back or side of the shell of each type of hair dryer is provided with a rotatable circular hood. By rotating the hood to adjust the cross-section of the air inlet, the temperature of the conveying wind and the temperature of the hot air can be adjusted.
        According to the way of use, there are hand-held and support hair dryers. The pedestal hair dryer can be placed on the table or hung on the wall to blow yourself. According to the air supply method, there are centrifugal hair dryers and axial flow hair dryers. The centrifugal type drives the blades to rotate, so that the air entering the blower obtains inertial centrifugal force and continuously vents outward. Its disadvantage is that the exhausted wind does not flow through the motor, and the motor heats up. The advantage is that the noise is low. The axial flow motor drives the blades to rotate, pushing the air entering the blower for axial flow and continuously venting outward. The advantage is that all of the discharged air flows through the motor, the motor has good cooling conditions, and the insulation is not easy to age; its disadvantage is that the noise is large. According to the materials used in the outer casing, there are metal hair dryers and plastic hair dryers. The metal hair dryer is rugged and can withstand higher temperatures. The plastic hair dryer is light in weight and good in insulation performance, but is easy to age and has poor high temperature resistance.
1. Housing. It protects the internal parts and is an external decorative part.
2. Electric motor and fan blades. The motor is housed in the housing and the vane is mounted on the shaft end of the motor. When the motor rotates, air is taken in by the air inlet, and the air is blown out by the air outlet.
3. Electric heating elements. The electric heating element of the hair dryer is made of electric heating wire and is installed at the air outlet of the hair dryer. The wind discharged by the motor is heated by the electric heating wire at the air outlet to be sent by hot air. Some hair dryers are equipped with a thermostat near the electric heating element. When the temperature exceeds the predetermined temperature, the circuit is cut off to protect it.
4, the windshield. Some hair dryers have a circular windshield at the air inlet to adjust the air intake. A hair dryer without a circular windshield can also adjust the amount of air intake by covering a part of the air inlet with a piece of paper. When the amount of air intake is small, the wind blown out is relatively hot, and the wind that is blown out by the air volume is not too hot. It should be noted that the tuyere cannot be blocked too much, otherwise the motor will be damaged or the electric heating element will be burnt out due to excessive temperature.
5, the switch. The hair dryer switch generally has three positions of “hot air”, “cold wind” and “stop”. Common white means “stop”, red means “hot air” and blue means “cold wind”.
      Some electric heating elements of the hair dryer are composed of two or three electric heating wires for adjusting the temperature and are controlled by the selection switch. With the reform and gradual improvement of the performance of the hair dryer, a set of thermostatic automatic electronic control components are connected in series with the heating elements of most hair dryers at home and abroad. It can automatically turn on the circuit under the normal working condition of the air cylinder and encounter special In the case (such as the phenomenon of overheating of the heating element), the circuit is automatically cut off. In the selection of the material of the air duct casing, the material of metal (such as copper or cold-rolled iron plate) was used in the past, and the thermoplastic engineering materials (mainly polycarbonate, modified polystyrene, modified polypropylene, etc.) were selected. to make.