Product features and installation points of duct fan

Duct fan refers to the selection of control parameters such as air volume, total pressure, efficiency, noise, motor power, etc., also known as duct fan. According to the physical and chemical properties of the gas to be transported, choose ventilators for different purposes.

Features

1. The selected control parameters of the duct fan are air volume, total pressure, efficiency, noise, motor power, etc.

2. According to the physical and chemical properties of the gas to be transported, choose ventilators for different purposes. Such as conveying clean air, you should choose general ventilator; conveying flammable and explosive gas, you should choose explosion-proof ventilator; conveying corrosive gas, you should choose corrosion-resistant fan.

3. When selecting the type of fan, the air leakage loss of the piping system, calculation error, and the negative deviation of the actual air volume and air pressure of the fan should be considered. Generally, the air volume is 1.05~1.1, and the safety factor of air pressure is 1.10~1.15. However, it is not too large to prevent the ventilator from operating in a low-efficiency area for a long time.

4. Pay attention to the matching relationship between the resistance characteristics of the pipe network and the characteristics of the fan. In order to make the fan operate stably, the fan should work near its highest efficiency point. The working point of the fan is located on the right side of the peak point of the total pressure in the performance curve (that is, the side with a large air volume, and generally located at 80% of the peak value of the total pressure. ).

5. For the ventilation system with noise reduction requirements, the fan with high efficiency and low impeller peripheral speed should be selected first, and make it work near the highest efficiency point. Corresponding noise reduction and vibration reduction measures should also be taken according to the transmission mode of noise and vibration generated by the ventilation system.

6. Duct fan is through the change of blade shape, so that the air flow has both axial flow and partial centrifugal effect after entering the fan, so its performance is between the axial flow fan and the centrifugal fan.

7. Duct ventilators can provide medium wind pressure and medium air volume, and are more suitable for ventilation systems in high-rise civil buildings. Folding and editing this paragraph installation points 1. The fan installation base (foundation, hanger) should have sufficient strength, stability and durability, and the vibration of the base should meet the following requirements:

1) The natural vibration frequency of the foundation device shall not be greater than 1/3 of the speed of the motor and fan;

2) The difference between the vibration speed when the fan is running and the vibration speed when the fan is stationary must be more than 3 times.