What are the advantages and disadvantages of the DC fan and the AC fan?

What are the advantages and disadvantages of the DC Fan and the AC Fan?

The fan is mainly the difference of motor.

The difference between the Ac Fan and the Dc Fan . The former power supply is AC, and the supply voltage will be positive or negative. Unlike DC, the power supply voltage of the fan is fixed. It must rely on circuit control to make two sets of coils work alternately to produce different magnetic fields. AC fan for power frequency is fixed, the pole changing speed so the silicon steel sheet, determined by the power frequency, the higher frequency magnetic field switching speed faster, faster speed, theory, principle of DC fan like pole number more speed faster. However, the frequency can not be too fast, too fast will cause the difficulty of activation.
AC motor has become the most commonly used motor because of the great development of AC power system.
Compared with DC motor, AC motor has no commutator (see commutation of DC motor), so it is simple in structure, easy to manufacture and firm, and easy to make motor with high speed, high voltage, large current and large capacity. The coverage of AC motor power greatly, from a few watts to several 101000 watts, even millions of kilowatts.
DC motor has complex manufacturing process and high cost. It can't use DC motor in the place of AC motor. Sometimes the DC motor is more convenient in the absence of electricity, so the use of fans is different and different. For example, the Radiator Fan inside the battery charger, the computer CPU, the computer chassis heat dissipation fan are 12 volts and 1 ampere specifications of the DC drive fan. AC fan fan is AC driven AC fan cases such as suction heating boiler draft fan 220 volt 0.25 amps 40 watts of power, but also rural Kang above the chimney.
But the AC fan is not better than the direct current fan. About fan maintenance: first, open the equipment shell, then open the fan, the fan closed equipment supply, 2CM distance with air gun, blowing fan; then wipe with industrial alcohol dirt fan above, then tilt the body to adjust the clearance position, after a good tune with the wind blowing dust gun device. From the front of the equipment to the equipment, it needs to be cleaned and rotated again and again until clean.

High-efficiency Centrifugal Blower

Using the latest design, in line with the "three of" standard two rows of large spacing cupola, for the current casting industry commonly used in a cupola, the main structural features for the two rows of vents, row spacing larger, bottom coke burning The formation of two independent combustion zone, by stretching the overheating zone, an increase of hot metal overheating and end coke intense combustion, stable furnace conditions, hot metal temperature, hot metal quality. In accordance with the supply air temperature is divided into cold air, furnace hot air two structures, by mining different temperature air supply to achieve different melting requirements.

Centrifugal blowers are widely used in sewage treatment, smelting blast furnace, coal preparation plant, mine flotation, chemical gas, vacuum and other fields, can also be used to transport other special gases.

Features:

1. Compact structure: beautiful appearance, good stability, easy installation and maintenance.

2. Smooth operation: Optimized design of the impeller to reduce the axial force to a minimum, and efficient impeller, and static and dynamic balance correction, the machine running smoothly, without any damping device in the case of bearings Amplitude ≤0.04mm.

3. Low noise: blower operation, without any mechanical friction, the use of a reasonable blade-shaped line to the sound to a minimum. Centrifugal blower noise is high-frequency noise, as long as there are obstacles, can be noise, so the fan room almost no noise.

4. Oil-free machinery: Blower bearings with grease lubrication, bearing life of more than three years. Fan does not generate oil and gas during operation. Special requirements fans, with molybdenum disulfide lithium grease lubrication bearings.

5. Impeller: Impeller with a special compound linear, reducing internal leakage and improve the volumetric efficiency.

6 easy to adjust: the inlet valve to regulate flow, the outlet valve to regulate the pressure.

7. Drive: usually using a two-pole asynchronous motor, you can also use four-pole motor drive. Depending on the user grid, different voltage motors can be used.

8. Sealing: In addition to each level of import impeller impeller, the interstage and the housing at both ends with a labyrinth seal to prevent gas leaks.

9. Cooling: exhaust bearing housing has two structures, air-cooled and water-cooled, as the impeller on the level of gas compression, resulting in the exhaust casing temperature is much higher than the intake casing. In the exhaust bearing air-cooled or water-cooled device to extend the bearing life.

10. Bearing temperature control alarm: fan accessories with temperature control box, connected to the bearing through the PT100 resistance, when the bearing temperature exceeds the set temperature, the temperature control box will automatically alarm.

11. Transmission: a coupling drive, belt drive, gearbox drive three. According to different equipment and technology, choose a different transmission

High-Efficiency Centrifugal Blower

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Shenzhen Fu Sheng Electric Co., LTD. , http://www.fushengfan.com