Fire Exhaust Fan ,Cabinet Centrifugal Fan Case

 

The cross section of an axial fan is generally a wing section. The blade can be fixed in position, or it can rotate around its longitudinal axis. The angle between the blades and the airflow or the distance between the blades may not be adjustable or adjustable. Changing the blade angle or pitch is one of the main advantages of axial fans. A small blade pitch angle produces a lower flow rate, while increasing the pitch can produce a higher flow rate. Advanced axial flow fans can change the blade pitch while the fan is running (this is quite similar to a helicopter rotor), thereby changing the flow accordingly. This is called adjustable moving blade (VP) axial flow fan.

The selected control parameters of the fire-fighting exhaust fan case include air volume, total pressure, efficiency, noise, and motor power. There are centrifugal and axial flow. Because the fan is equipped with a fire-fighting exhaust air box, it is beneficial to noise reduction. When selecting the fan type, the air leakage loss of the piping system, calculation errors, and the negative deviation of the actual air volume and air pressure of the fan should be considered. Generally, a safety factor of 1.05 to 1.10 to 1.15 is used. However, it is not too large to prevent the ventilator from operating in a low-efficiency area for a long time. Pay attention to the matching relationship between the resistance characteristics of the pipe network and the characteristics of the ventilator.

In order to make the ventilator operate stably, the ventilator should be made to work near its efficiency point. The working point of the ventilator is located on the right side of the peak point of the total pressure in the performance curve (that is, the side of the large air volume, and generally located at 80% of the peak value of the total pressure) . According to the characteristics of the axial flow fan, it is classified as follows: Classified by material: steel fan, glass fiber reinforced plastic fan, plastic fan, PP fan, PVC fan, magnesium alloy fan, aluminum fan, stainless steel fan and so on. Classified by purpose: explosion-proof fans, anti-corrosion fans, explosion-proof and anti-corrosion fans, special axial fans and other types.

Briefly explain that the ordinary axial flow fans produced by Boxing Motexo Industries Co.,Ltd can be used for ventilation in general factories, warehouses, offices, houses, etc., and can also be used for air coolers (air coolers), evaporators, condensers, spray droplets, etc. There are also axial fans for mines. The anti-corrosion and explosion-proof axial fans adopt anti-corrosion materials and explosion-proof measures, and are matched with explosion-proof motors. They can be used to transport explosive, volatile, and corrosive gases, and the gas that is required to be transported by axial fans. There should be no significant dust, viscous and fibrous materials; the temperature of the motor directly connected type should not exceed 40℃, and the temperature of the belt drive type should not exceed 60℃. The amount of dust in the conveying gas shall not exceed 150mg/m3. The axial flow fan is mainly composed of impeller, casing, motor and other parts, and the bracket is connected with the casing air duct by means of steel.