A hair dryer is a combination of a set of electric heating wires and a small fan with a high speed. When electricity is applied, the electric heating wire will generate heat, and the wind from the fan will pass through the electric heating wire and become hot air. If only the small fan rotates, and the electric heating wire is not hot, then the wind blowing out is not hot.
The air from the hair dryer belongs to the dry air. If it is used for too long, it is easy to cause the loss of water and heat damage. The secret to minimize the damage is: pat the water on the hair with a towel first, comb the hair gently with your hand, and then use the hair dryer.
The hair dryer is mainly used for drying and shaping hair, but it can also be used for local drying, heating and physiotherapy in laboratories, physiotherapy rooms and industrial production and art. According to the type of motor it uses, it can be divided into AC series type, AC shield type and DC permanent magnet type. The advantages of series excited hair dryer are large starting torque, high speed, suitable for manufacturing high-power hair dryer; The disadvantage is loud noise, commutator has certain interference to telecommunication equipment. The advantages of the cover pole type hair dryer are low noise, long life, will not cause interference to telecommunications equipment; Disadvantages are low speed, poor starting performance, heavy weight. Permanent magnet hair dryer has the advantages of light weight, high speed, simple manufacturing process, low cost, good quality and low price.
Although there are many kinds of hair dryer, the structure is much the same, and they are all composed of shell, handle, motor, wind blade, electric heating element, windshield, switch, power cord and so on.
The rotor is directly driven by the motor to drive the wind blade to rotate. When the wind blade rotates, the air is inhaled from the air intake, and the resulting centrifugal air flow is blown out by the front mouth of the air 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 heating, it blows out cold air. This is the purpose of drying and shaping the hair dryer.
The selection switch on the handle of the hair dryer is generally divided into three gears, namely, off gear, cold gear and hot air gear, and there are signs with colors of white, blue and red. The handle of some hair dryer is also equipped with a motor speed control switch, for choosing 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 dryer is provided with a rotating circular air hood, which can adjust the size of the cross section of the air intake, so as to adjust the conveying wind speed and the temperature of the hot air.
According to the way of use, there are hand-held and support blower. Support type hair dryer can be put on the table or hung on the wall to use, you can blow yourself.
According to the air supply, 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 hair dryer to flow axially, and continuously exhausts the air. Its advantage is that all the discharged wind flows through the motor, the motor cooling condition is good, insulation is not easy to aging; Its disadvantage is that it is noisy.
