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- INDUSTRIAL SWITCHGEAR
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Product Name: extractor fan
China extractor fan manufacturer, supplier, factory - ELMAK ELECTRICAL
China extractor fan manufacturer
The exhaust fan is a kind of axial flow fan. It is mainly used in negative pressure ventilation and cooling projects and is called industrial exhaust fan. The exhaust fan has the characteristics of super large air duct, super large blade diameter, super large exhaust air volume, super low energy consumption, low speed, low noise and so on.
It can be used together with the cooling water curtain to solve the problems of ventilation and cooling in one fell swoop. During the operation of the exhaust fan, a negative pressure environment is formed in the room. If a cooling water curtain is installed on the other side of the outlet of the exhaust fan, the exhaust fan will exhaust the sultry indoor air out of the room, and at the same time, the low-temperature air that enters the room through the cooling water curtain and is rich in water vapor will be sucked into the room. Achieve the effect of ventilation and cooling.
There are many types of exhaust fans. We need to choose the most suitable ventilation and cooling equipment according to some attributes such as air volume and static pressure. Calculate the required power, taking into account the use of the motor for this purpose, it is best to leave a margin of 20-25%.
When two blowers operate in parallel, A becomes the sum of the air volume at the point where the pressure is equal. Therefore, according to the respective waiting curves of FanA and FanB, the characteristic curve of parallel operation can be obtained.
Because the operating point of the blower is the intersection of the resistance curve and the characteristic curve, the air volume will be large if the resistance curve cannot be found. When the resistance curve changes, the air volume basically does not increase. However, no matter what, the parallel operation of two blowers cannot achieve the sum of their capabilities. Therefore, if the two machines are really required to operate in parallel, the thicker pipeline needs to be redesigned, and the resistance curve must reach the sum of its air volume.
Principle of Ventilation
When the exhaust fan discharges air to the outside, the indoor air pressure will drop, and the indoor air will become thinner, forming a negative pressure zone, and the air will flow into the room due to the compensation of the air pressure difference. In the practical application of industrial plants, exhaust fans are usually installed centrally on one side of the plant, and the air intake is on the other side of the plant. The air is blown by convection from the air intake to the exhaust fan. During this process, the doors and windows near the exhaust fan are kept closed, forcing air to flow into the workshop through the doors and windows on the side of the air inlet. Air lined up and flowed into the workshop from the air intake in an orderly manner, flowed through the workshop, and discharged from the workshop by the exhaust fan. The ventilation is thorough and efficient, and the ventilation rate can be as high as 99%. Through specific engineering design and design ventilation speed and wind speed according to needs, any high heat, harmful gas, dust and smoke can be quickly discharged from the workshop, and any poor ventilation problem can be completely solved at one time. The effect of ventilation can be achieved within a few seconds of turning on the fan.
China extractor fan manufacturer, supplier, factory
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