The hair dryer is an essential small electrical appliance in the home. It has a small body but has many uses. It can be called an “artifact” in the home.
But how does it blow the wind? What are the hidden secret features?
Let us unveil the mysterious “veil” of the hair dryer together.
● The structure and principle of the hair dryer
1. The basic structure of the hair dryer
(1). Handle
Hair dryer handles are generally divided into two types: folding and upright. Folding handles are convenient for users to carry, and hair dryers with higher power generally use upright handles.
(2). Operation switch
The function operation switch of the hair dryer is used for on-off operation and wind speed adjustment of the hair dryer; the temperature adjustment switch can adjust the temperature of the hair dryer.
(3). Air guide port and air inlet filter
The air guide of the hair dryer is directly installed at the air outlet of the shell, and its air guide is flat, which can collect the wind and let the wind blow in a straight line. The function of the air intake filter is to prevent the sundries in the wind from entering the inside and damaging the motor.
(4). Heating wire assembly
The hair dryer heating wire assembly is made of heating wire wound on a mica sheet and is installed in the casing cylinder of the hair dryer. The wind discharged from the motor is heated by the heating wire in the casing cylinder and sent out as hot air. Generally, there are two sets of heating wires winding on the mica sheet inside, which is convenient for the circuit to adjust the warm air and hot air.
(5). Motor and wind blade
Most of the motors of hair dryers use permanent magnet DC small motors, and the internal circuit needs a step-down rectifier. The motor is installed in the casing, and the fan blades are installed on the shaft end of the motor. When the motor rotates, the air is sucked in by the air inlet, and the air outlet blows the air out.
2. The principle of hair dryer
The hair dryer directly relies on the motor to drive the rotor to drive the fan blades to rotate. When the fan blades rotate, the air is sucked in from the air inlet, and the front nozzle of the hair dryer then blows out the centrifugal airflow formed. When the air passes through, if the heating wire installed on the heating bracket in the tuyere has been energized and heated, hot air will be blown out; The hair dryer is here to achieve the purpose of drying and shaping.
● how many watts does a hair dryer use?
The common power of professional hair dryers in barbershops is: 1200 watts – 2000 watts.
The power of hair dryers commonly used in general households is: 250 watts to 1200 watts.
Note: In the case of the same use time, the greater the power of the hair dryer, the greater the power consumption. Generally, the power consumption of household hair dryers is 0.3-1.2 degrees per hour, which belongs to the category of high-power electrical appliances.
In some old-fashioned houses, the circuit cannot carry too much power. If you use some high-power electrical appliances and continue to use high-power hair dryers above 1200 watts, the fuse may be blown.
● Are hair dryers a radiation hazard?
A hair dryer is an electrical product that uses a heating wire to heat the air to work. When the current passes through the heating wire, it can convert electrical energy into heat energy. At this time, the electromagnetic waves it radiates outward belong to the infrared band, that is, infrared rays. Infrared rays are non-ionizing radiation, so they will not affect the human body.
● Why does the hair dryer catch fire?
1. The air outlet of the hair dryer is covered
Because the hair dryer is mainly composed of a heating wire at the front and a small fan at the rear, its casing is generally made of plastic. When the air outlet is covered, it will seriously affect the heat dissipation of the hair dryer, and the high temperature will easily cause the plastic casing and covering to burn.
2. Put the hair dryer on flammable items
The high-power hair dryer that has just been blown is hot, and the heating wire in the hair dryer turns red and hot when it is energized. If the heat cannot be conducted away quickly or touches the silk threads of cotton products on the sofa or bed, it is easy to ignite the sheets and bed sheets.
3. Hair dryer aging, short circuit
If the hair dryer of a big brand has abnormal noise, peculiar smell, smoke, and other problems during use, it may be caused by the aging or short circuit of the hair dryer. It is recommended to replace the hair dryer with a new one.
● How to use a hair dryer safely?
If you find abnormal phenomena such as a burnt smell and smoke from the power cord during use, you should turn off the power immediately and use it after finding out the cause.
When using a hair dryer, turn on the power first, and then turn on the switch to avoid electric shock due to instantaneous high voltage.
Hair dryers should not be used in bathrooms or places with high humidity to avoid electric shock.