The blower directly relies on the motor to drive the rotor to drive the wind blade to rotate. When the wind blade rotates, the air is inhaled from the air inlet, and the resulting centrifugal air is blown out by the front mouth of the wind duct. When the air passes through, if the heating wire installed on the heating bracket in the air nozzle has been energized and heated, the hot air is blown out; If the selection switch does not make the heating wire energized and heated, it blows out cold air. The hair dryer is here to achieve the purpose of drying and shaping. The selection switch on the handle of the hair dryer is generally divided into three gears, that is, the close gear, the cold wind gear, the hot air gear, and the color is white, blue, and red signs. The handle of some hair dryers is also equipped with a motor speed control switch for selecting the size of the air volume and the temperature of the hot air. The back or side of the shell of all kinds of hair dryers are provided with a circular adjustable air hood, which can be rotated to adjust the size of the cross section of the air intake, so that the conveying wind speed and the temperature of the hot air can be adjusted.
According to the way of use, there are handheld and support hair dryers. The support type hair dryer can be placed on the table or hung on the wall to use, you can blow yourself. According to the air supply mode, there are centrifugal hair dryer and axial flow hair dryer. The centrifugal type relies on the motor to drive the wind blade to rotate, so that the air entering the hair dryer obtains the inertial centrifugal force, and constantly exhausts the air. Its disadvantage is that the discharged wind does not all flow through the motor, the motor temperature is higher; The advantage is lower noise. The axial flow motor drives the wind blade to rotate, pushes the air into the blower to flow axially, and continuously exhausts the air to the outside. Its advantage is that all the discharged wind flows through the motor, the motor cooling conditions are good, and the insulation is not easy to age; Its disadvantage is that it is noisy. According to the material used in the shell, there are metal type hair dryers and plastic type hair dryers. Metal type hair dryers are durable and can withstand higher temperatures. Plastic hair dryers are light in weight and have good insulation performance, but they are easy to age and have poor high temperature resistance.
1. Shell. It has a protective effect on the internal parts and is also an external decorative part.
2. Motor and blades. The motor is mounted in the housing, and the wind vane is mounted on the shaft end of the motor. When the motor rotates, air is drawn in by the inlet and air is blown out by the outlet.
3. Electric heating element. The electric heating element of the hair dryer is wound with electric heating wire and installed in the air outlet of the hair dryer. The air discharged by the motor is heated by the electric heating wire in the air outlet and is sent out as hot air. Some hair dryers install a thermostat near the electric heating element, and cut off the circuit when the temperature exceeds the predetermined temperature, which plays a protective role.
4. Windshield. Some hair dryers have a circular windshield at the air inlet to adjust the amount of air inlet. A hair dryer without a circular windscreen can also be used to cover part of the air intake with a piece of paper to adjust the air intake volume. If the inlet air volume is small, the wind blown out is hotter, and the inlet air volume is large, the wind blown out is not too hot. It should be noted that the tuyere should not be blocked too much, otherwise it will damage the motor or burn out the electric heating element due to high temperature.
5. Switch. Hair dryer switch generally has "hot air", "cold air", "stop" three positions, commonly used white means "stop", red means "hot air", blue means "cold wind".
The electric heating element of some hair dryers is composed of two or three electric heating wires to adjust the temperature, which is controlled by a selection switch. With the reform and gradual improvement of the performance of the hair dryer, now most of the heating elements of the hair dryer at home and abroad are connected in series with a set of constant temperature automatic electronic control elements, which can automatically connect the circuit in the normal operation of the air duct, and automatically cut off the circuit in special cases (such as overheating of the electric heating element). In the selection of wind duct shell materials, the past selection of metal (such as copper or cold rolled iron sheet) materials, to the selection of thermoplastic engineering materials (mainly polycarbonate, modified polystyrene, modified polypropylene, etc.) made.