Hair dryers are mainly used for drying and shaping hair, but they can also be used for local drying, heating and physiotherapy in laboratories, physiotherapy rooms, industrial production, and art. According to the type of motor it uses, it can be divided into AC series, AC shroud and DC permanent magnet. The advantage of the series-excited hair dryer is that the starting torque is large and the rotation speed is high, which is suitable for manufacturing a high-power hair dryer; the disadvantage is that the noise is large, and the commutator has certain interference to the telecommunication equipment. The advantage of the cover-type hair dryer is that the noise is small and the service life is long, and the communication equipment does not cause interference; the disadvantage is that the rotation speed is low, the starting performance is poor, and the weight is large. The advantages of the permanent magnet type hair dryer are light weight, high rotation speed, simple manufacturing process, low cost, and high quality and low price. The size of the hair dryer is mainly divided by electric power. The commonly used specifications are 250 watts, 350 watts, 450 watts, 550 watts, 850 watts, 1000 watts, 1200 watts, etc. Although the hair dryers are very different in type, style and size, their internal structures are basically the same, mainly composed of three parts: the motor and its driving blades, heating elements and electrical control switch parts. The motor, vane and outer casing are combined to form a miniature blower.


        With the reform and gradual improvement of hair dryer performance, a set of constant temperature automatic electronic control components are connected in series with the heating elements of hair dryers at home and abroad. It can automatically turn on the circuit under the normal working condition of the air cylinder, encountering special circumstances. (If the heating element is overheated, etc.), 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. Working principle The hair dryer directly drives the rotor to drive the rotor to rotate. When the blades rotate, air is drawn in from the air inlet, and the centrifugal air stream 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 hair dryer handle 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, and the width of the air inlet and the temperature of the hot air can be adjusted by rotating the hood to adjust the cross-sectional size of the air inlet.
        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, and you can blow your own hair. According to the air supply method, there are centrifugal hair dryer and axial flow hair dryer. The centrifugal type drives the fan blades to rotate, so that the air entering the hair dryer 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, and the air that enters the hair dryer is axially flowed, and the air is continuously exhausted 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 has light weight and good insulation performance, but is easy to age and has poor high temperature resistance. Although there are many types of hair dryers, the structure is similar. They are composed of a casing, a handle, a motor, a fan blade, an electric heating element, a windshield, a switch, and a power cord.
        The functions of each part of the hair dryer are: 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, and when the temperature exceeds the predetermined temperature, the circuit is cut off to protect. 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 with a part that covers the air inlet. The amount of air intake is small, the wind blown out is relatively hot, the amount of air entering is large, and the wind blown out 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 “tough”. 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.