Classification of hair dryers.Hair dryer with diffuser and concentrator

　　According to usage, it can be divided into handheld and stand type.

　　According to the type of motor, it can be divided into single-phase AC motor, AC/DC dual-purpose series excitation motor, DC permanent magnet motor, and shield pole motor. Among them, permanent magnet hair dryers use permanent magnet DC motors, which have higher power and lower price, but higher noise; Induction hair dryers use induction motors with low noise, usually centrifugal blades.

　　According to the air supply method, it can be divided into axial flow type and centrifugal type. The air inlet of the axial flow type hair dryer is located at the rear end of the casing, and all cold air passes through the motor. The temperature rise of the motor is low, and the insulation material is not easy to age, but the noise is relatively high; The inlet of the centrifugal hair dryer is on the side, and the cold air cannot pass through the motor completely. The temperature rise of the motor is higher and the noise is less.

　　According to the shell material, it can be divided into metal type, plastic type, and metal plastic mixed type.

　　According to the form of the handle, it can be divided into fixed type, folding type, and handle less type.

　　According to their functions, they are divided into regular hair dryers and high-speed hair dryers. Regular hair dryers dry hair by raising the temperature, while high-speed hair dryers accelerate the flow of air around the hair by increasing the wind speed, thereby making the hair dry faster.

　　According to their special functions, they are divided into constant temperature hair dryers, negative ion hair dryers, nano water ion hair dryers, etc.

　　In addition, according to the power level, hair dryers can also be divided into powered hair dryers (power between 1800W and 2200W) and unpowered hair dryers (power around 1200W), among which unpowered hair dryers are also known as silent hair dryers.

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