hair dryer: its specifications are mainly divided by electric power. The commonly used specifications are 25 watts, 35 watts, 45 watts, 55 watts, 85 watts, 1 watts, 12 watts, etc. Although there are great differences in the types, styles and sizes of hair dryers, their internal structures are basically the same, and they are mainly composed of three parts: the motor and its driving blades, heating elements and electrical control switches. The motor, blades and shell structure are combined to form a miniature hair dryer. The electric hair dryer directly relies on the motor to drive the rotor to drive the blades to rotate. When the blades rotate, the air is sucked in from the air inlet, and the centrifugal airflow thus formed is blown out from the front nozzle of the air duct. When the air passes through, if the heating wire on the heating bracket installed in the air nozzle has been electrified to become hot, hot air is blown out; If the selector switch does not energize the heating wire, it will blow out cold air. Hair dryer is to achieve the purpose of drying and shaping. The selector switch on the handle of the hair dryer is generally divided into three gears, namely, closed gear, cold gear and hot gear, and signs with white, blue and red colors are attached. The handle of some hair dryers is also equipped with a motor speed switch for selecting the size of air volume and the temperature of hot air. On the back or side of the shell of all kinds of hair dryers, there is a rotatable circular air regulating hood. By rotating the hood to adjust the cross section of the air inlet, the conveying wind speed and the temperature of hot air can be adjusted.
the theoretical principles of electric hair dryer and hair dryer are almost the same: they are mainly used for hair drying and shaping, but they can also be used for local drying, heating and physical therapy in laboratories, physical therapy rooms, industrial production and art design. According to the type of motor it uses, it can be divided into AC series excitation type, AC shield pole type and DC permanent magnet type. The advantages of series-excited hair dryer are large starting torque and high rotating speed, which are suitable for manufacturing high-power hair dryers. The disadvantage is that the noise is high, and the commutator has certain interference to telecommunication equipment. The advantages of the hood-pole hair dryer are low noise, long service life and no interference to telecommunication equipment. Disadvantages are low speed, poor starting performance and heavy weight. The advantages of permanent magnet hair dryer are light weight, high rotating speed, simple manufacturing process, low cost, good quality and low price.