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Hair Dryers (20)

Hair Dryers
The hair dryer is a combination of a set of electric heating wires and a small high-speed fan. When energized, the heating wire generates heat, and the wind blown by the fan passes through the heating wire to become hot air. If only a small fan rotates and the heating wire is not hot, then only the wind blows out, not the heat.
The wind blown by the hair dryer is dry. If it is used for too long, it will easily cause moisture loss and heat damage. The secret to minimizing the damage is: use a towel to dry the moisture on the hair first, and gently use your hands. Comb your hair and then use the hair dryer.
    The hair dryer is mainly used for drying and shaping the hair, but it can also be used for local drying, heating and physiotherapy in laboratories, physiotherapy rooms, industrial production, and art. According to the type of motor it uses, it can be divided into AC series type, AC shaded pole type and DC permanent magnet type. The advantages of series-excited blowers are large starting torque and high speed, which are suitable for making high-power blowers; the disadvantage is that they are noisy and the commutator has certain interference to telecommunication equipment. The advantages of shaded-pole hair dryers are low noise, long life, and no interference to telecommunications equipment; disadvantages are low speed, poor starting performance, and heavy weight. The advantages of permanent magnet hair dryers are light weight, high speed, simple manufacturing process, low cost, high quality and low price.
Although there are many types of hair dryers, the structure is similar, and they are all composed of shell, handle, motor, fan blade, electric heating element, wind deflector, switch, power cord and so on.
  The blower directly relies on the motor to drive the rotor to drive the blades to rotate. When the blades rotate, air is sucked in from the air inlet, and the resulting centrifugal air flow is blown out from the front nozzle of the blower. When the air passes through, if the heating wire on the heating bracket installed in the tuyere has been energized to become hot, hot air will be blown out; if the selector switch does not make the heating wire energized to generate heat, cold air will be blown out. The 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, off gear, cold wind gear, and hot wind gear, and there are signs with white, blue, and red colors. Some hair dryers are also equipped with a motor speed switch on the handle, which is used to select the size of the air volume and the temperature of the hot air. All kinds of hair dryers are equipped with a rotatable circular air-regulating hood behind or on the side of the housing. By rotating the hood to adjust the cross-sectional size of the air inlet, the conveying wind speed and the temperature of the hot air can be adjusted.
According to the method of use, there are handheld and stand-alone hair dryers. The pedestal hair dryer can be used on the table or hung on the wall, and you can blow it yourself.
According to the air supply method, there are centrifugal blowers and axial blowers. The centrifugal type relies on the electric motor to drive the blades to rotate, so that the air entering the hair dryer obtains inertial centrifugal force and continuously exhausts the air to the outside. Its disadvantage is that all the exhausted wind does not flow through the motor, and the temperature of the motor is higher; the advantage is that the noise is lower.
The axial flow motor drives the fan blades to rotate, pushing the air entering the blower to flow axially, and continuously exhausting the air. Its advantage is that all the exhausted wind flows through the motor, the motor has good cooling conditions, and the insulation is not easy to age; its disadvantage is that it is noisy.
According to the material used in the shell, there are metal-type hair dryers and plastic-type hair dryers. The metal hair dryer is durable and can withstand higher temperatures. Plastic hair dryers are light in weight and have good insulation properties, but they are prone to aging and have poor high temperature resistance.
1. Shell. It protects the internal parts and is also an external decoration.
2. Motor and fan blades. The motor is installed in the housing, and the fan blade is installed on the shaft end of the motor. When the motor rotates, air is drawn in from the air inlet, and wind is blown out from the air outlet.
3. Electric heating element. The electric heating element of the hair dryer is made of electric heating wire, and is installed at the air outlet of the hair dryer. The wind discharged by the motor is heated by the electric heating wire at the air outlet and sent out as hot air.
Some hair dryers are equipped with a thermostat near the heating element to cut off the circuit when the temperature exceeds a predetermined temperature to protect it.
4. Windshield. Some hair dryers have a round wind deflector at the air inlet to adjust the air intake. For a hair dryer without a round wind deflector, a piece of paper can be used to cover a part of the air inlet and the air volume can also be adjusted. If the air intake is small, the air blowing out will be hotter, and if the air intake is large, the blowing air will not be too hot. It should be noted that the tuyere should not be blocked too much, otherwise it will damage the motor or burn out the heating element due to the high temperature.
5. Switch. The blower switch generally has three positions of "hot air", "cold air", and "stop". White means "stop", red means "hot air", and blue means "cold air".
The heating element of some hair dryers is composed of two or three sections of heating wire, which is used to adjust the temperature and is controlled by a selector switch.
With the reform and gradual improvement of the performance of hair dryers, most of the heating elements of hair dryers at home and abroad are connected in series with a set of thermostatic automatic electronic control elements, which can automatically switch on the circuit under the normal working condition of the hair dryer. (Such as overheating of electric heating elements) automatically cut off the circuit. In the selection of the material of the air duct shell, metal (such as copper or cold-rolled iron plate) materials were used in the past to use thermoplastic engineering materials (mainly polycarbonate, modified polystyrene, modified polypropylene, etc.) to make.

The size of the hair dryer is mainly divided by electric power. Commonly used specifications are 250 watts, 350 watts, 450 watts, 550 watts, 850 watts, 1000 watts, 1200 watts and so on. Although the type, style and size of hair dryers are very different, their internal structure is roughly the same, mainly composed of three parts: the motor and its driving fan, heating element and electrical control switch. The motor, the fan blade and the shell structure are combined to form a miniature hair dryer.

Electrostatic type:
It is a kind of ion eliminator with large air volume and wide range. The neutralization time is fast, the ion wind covers a large area, and it has a heating function. It can be used as a desktop or hanging type. The ion balance voltage is 0V (+/-5V).
Principle of action:
The ion fan can generate a large amount of airflow with positive and negative charges, which can neutralize the charge on the object. When the charge on the surface of the object is negative, it will attract the positive charge in the airflow. When the charge is positive, it will attract the negative charge in the airflow, so that the static electricity on the surface of the object is neutralized, achieving the purpose of eliminating static electricity.
It is suitable for the elimination of static electricity in a large area. Neutralize static electricity quickly; stable performance; equipped with ion emission needle cleaner; built-in fan and high-voltage generator; adjustable ion air volume.
typical application:

Precision electronic product production; electronic assembly line, microelectronics production, optoelectronics, pharmaceutical manufacturing assembly line, printing, packaging; small product molding, plastic film cutting, circle and film, and mold product demolding, etc.

Blowing correctly:
1. After washing the hair, wipe off the excess water with a dry towel, then divide the hair well, and fix the outer hair on the top of the head with a clip. Because it can dry the hair better.
2. Remove the hair on the top of the head, divide it into two parts and dry it, insert it into the hair with both hands and comb it, and dry it with a hairdryer.
3. Divide the lower part of the hair into two sides, spread 5 fingers and insert them into the hair, while using your fingers to comb from the head to the end, while drying with a hair dryer.
4. Divide the hair on the side into two parts with the ear as the boundary. Use a roller comb to slowly comb the hair from the root to the tip, and place the hair dryer on the side to blow the air. The hair behind the ears is treated in the same way.

The benefits of using a hair dryer:
1. Dry and dehumidify. In families with babies, diapers can't be dry on rainy days. Blow it with a hair dryer, it works well.
2. Dust removal of electrical appliances. When household appliances are immersed in water or damp, you can use a hair dryer to dissipate the moisture; when the power is off, the back cover of the household appliances with dust can be opened, and the hair dryer can be used to blow away the dust in cool breeze to avoid short-circuit and high-voltage breakdown. Extend the service life of electrical appliances.
3. Correct the refrigerator seal. If the refrigerator is used for a long time, the door seal will age and become uneven. Blow it with a hair dryer, the area that was originally sag can be restored to its original shape, and then cover it with a cold towel to cool and shape it, repeat it a few times, and the door seal will be repaired.
4. Defrost the refrigerator. The refrigerator needs a long time for defrosting each time. If you open the freezer door and blow hot air inside with a hair dryer, the defrosting time can be shortened and the intention of rapid defrosting can be achieved.
5. Stop bleeding. In normal days, if you accidentally cut a part of your body and bleed, you can immediately blow hot air to the wound with a hair dryer, which can make the wound scab and stop bleeding in a short time, which will greatly assist in avoiding wound infection and speeding up wound healing. .
6. Health care. For patients with low back pain or frozen shoulder, use a hair dryer to blow on the handle for a while before applying the plaster, and then apply the plaster after a little massage, which has an obvious healing effect. In addition, aim at the affected area with a hair dryer and blow hot air at appropriate intervals for 5 to 10 minutes each time to relieve pain.
7. Deworming. Aim the hair dryer at the holes, cupboards, and table crevices. Ants and carapace will run out if they become too hot, and they can be wiped out in one fell swoop.
8. Anti-mildew and insect-proof. Books, stamps, photo albums, etc. can often be blown with a hair dryer to drive moisture, mildew, insects, and yellowing of paper.

Now post-90s are facing such a problem, that is: hair loss. Now it's a great young age, and I feel that I'm almost middle-aged. In addition to other reasons, there is also hair loss, which makes us feel that we are indeed old.

So why is hair loss so serious at this age? It turns out that using a hair dryer incorrectly will also cause hair loss. I really know. If you don't want to become bald so quickly, let's take a look!

1. The distance is too close

Generally, we blow the hair with the maximum wind speed and blow it close to the scalp, because the hair will dry faster, but we don’t know that this is harmful to the hair.

The scalp is very fragile, especially after washing, it becomes more fragile. At this time, if you blow the scalp close to the scalp in a strong wind, the hair will easily dry out, and the hair loss problem will be more serious.

2. No need for cold wind

Hair dryers also have the function of cold air, which is ignored by many people. Most people use hot air to blow their hair from beginning to end. In fact, the correct way is to first open the scalp cuticle on the hair with hot air, and then use cold air. Blow dry, so that it will reduce the damage to the hair.

Hair loss is very common. If you don’t want to become bald at such a young age, you should take good care of your hair.

So, we don’t need a hair dryer in normal times. It’s summer anyway. I wrap my hair in a towel after washing it until it dries, which is better for my hair. Because I often perm and dye my hair, my hair is bad and can’t be broken anymore, so in order not to make myself bald, I still have to take good care of my hair~

Hair Dryers

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