The working principle of the hair dryer temperature control switch is that the hair dryer is equipped with a temperature protector (? Thermostat), when the fan works in the hot air gear, the temperature control element can automatically connect the circuit under the normal working condition of the air duct, and automatically cut off the circuit under special circumstances (such as overheating of the electric heating element).

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The blower directly relies on the motor to drive the rotor to drive the blades to rotate. When the blade rotates, air is sucked in from the air inlet, and the centrifugal air flow thus formed is blown out from the front nozzle of the punch. When air passes through, if the heating wire installed on the heating bracket in the air nozzle has been electrified and heated, hot air will be blown out; If the selector switch does not energize the heating wire, it will blow out cold air. This is the purpose of hair dryer to dry and finalize the design.

The selector switch on the handle of the hair dryer is generally divided into three gears, namely, off gear, cold gear and hot gear, and is marked with white, blue and red. The handle of some hair dryers is also equipped with a motor speed control switch, which is used to select the air volume and the temperature of hot air. On the back or side of various blower housings, there is a rotatable circular air conditioning cover. 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.