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Your current location What are the characteristics of roof fans

What are the characteristics of roof fans
Release time: October 12, 2019 Views: three hundred and eighty-five

In our daily life, there is often smoke, oil mist and other air pollution, especially in factories, these air will be long-term black or roof discoloration.


Roof fan The energy-saving technology of centrifugal fan is developed by the United States and Europe. The product design is smooth and beautiful, and the craft is exquisite, which can meet the requirements of high-grade buildings. The isolation of motor and exhaust gas is more suitable for removing smoke, oil mist and humid polluted air, and prolonging the service life of motor and transmission parts. It has the advantages of light weight, high pressure, moderate air volume, low noise, low power consumption, beautiful and solid appearance. It is widely used for roof ventilation of large workshops and high-grade civil buildings in machinery, chemical, rubber, pharmaceutical, textile and other industries.


1。 Roof fan is usually direct drive, light weight, maintenance free, reliable operation, used for roof ventilation.


2. According to different environment and transmission medium, explosion-proof motor is used to transport flammable and explosive gas. The product has passed the inspection and approval of the national authoritative explosion-proof testing organization.


3. The fireproof type made of high temperature resistant motor can run for more than 45 minutes at 280 ℃. According to the design requirements, it can be equipped with imported smoke exhaust and fire damper. Fans and fire valves have passed the type inspection of national fire products.


It can be seen that the roof fan can bring great help to our life. They are not only low noise, energy saving, but also beautiful appearance. At present, buildings can also be decorated while removing pollution. Everyone is very concerned about environmental protection. Roof fan is the realization of this concept, and will be recognized by the masses.


One. Voltage debugging. The fan is allowed to start at full voltage or reduced voltage, but it should be noted that the rated current is 5-7 times when starting at full voltage, and the step-down starting distance is directly proportional to the square of voltage. When the power grid capacity is insufficient, the step-down starting should be adopted. (when the power is greater than 11kw, the step-down starting is adopted).


2. Operation and commissioning. During the trial operation, the number of people shall not be less than two. One person controls the power supply, the other person observes the operation of the fan, and immediately stops to check the abnormal phenomenon; first, check whether the rotation direction is correct; during the operation of the fan, check whether the operating current of each phase is balanced and whether the current exceeds the rated current. If there is any abnormal phenomenon, the inspection shall be stopped. After running for 5 minutes, stop the machine to check whether the fan is abnormal, and then restart the machine.


3. Speed debugging. When testing the two speed fan, start it at low speed and check whether the rotation direction is correct. When starting at high speed, it is necessary to wait until the fan is stationary to prevent switch tripping and motor damage caused by high-speed reversal. When the fan reaches the normal speed, check whether the input power supply of each phase of the fan is normal, and the running current of the fan shall not exceed its rated current. If the operating current exceeds the rated current, check whether the fan voltage is normal.


4. Safety debugging. For centrifugal fans and fan cases, the required motor power refers to the power not required when the outlet is fully opened under uncertain working conditions, plus mechanical losses and due reserves. If the fan outlet is not connected to the pipe or runs empty without external resistance, the motor is in danger of burning out. For the sake of safety, valves should be added on the inlet and outlet pipes of the fan. When the motor fan is closed, the valve shall be opened slowly after operation until the specified working condition is reached. Attention shall be paid to whether the fan current exceeds the specified value.


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