Introduction To Basic Knowledge Of High-pressure Suction And Supply Fan

Fans are used in many fields, because many industrial production fields have certain requirements for ventilation, which can ensure a good environment in the production workshop, or some production processes can be carried out normally. High-pressure suction fan is a kind of fan commonly used. In this article, we will have a basic understanding.
High pressure suction fan refers to the selected control parameters such as air volume, total pressure, efficiency, noise, motor power, etc., also known as high pressure suction fan. Select fans for different purposes according to the physical and chemical properties of the transported gas.
1. The control parameters selected for the high-pressure suction and supply fan are air volume, total pressure, efficiency, noise, motor power, etc.
2. Select fans for different purposes according to the physical and chemical properties of the transported gas. If conveying clean air, general fan shall be selected; Explosion-proof fans shall be selected for conveying flammable and explosive gases; Corrosion-resistant fan shall be selected for transporting corrosive gas.
3. When selecting the type of fan, the air leakage loss and calculation error of the pipeline system as well as the negative deviation of the actual air volume and air pressure of the fan should be considered. Generally, the safety factor of 1.05-1.1 air volume and 1.10-1.15 air pressure should be adopted. However, it should not be too large to prevent the fan from operating in low efficiency area for a long time.
4. Pay attention to the matching relationship between pipe network resistance characteristics and fan characteristics. In order to ensure the stable operation of the fan, the fan shall be operated near its highest efficiency point, and the working point of the fan shall be located at the right side of the peak point of the total pressure in the performance curve (that is, the high air volume side, and generally at 80% of the peak point of the total pressure).
5. For the ventilation system with noise elimination requirements, the fan with high efficiency and low impeller circumferential speed shall be selected first, and the fan shall work near the highest efficiency point. Corresponding noise elimination and vibration reduction measures shall also be taken according to the transmission mode of noise and vibration generated by the ventilation system.
6. High-pressure suction and forced draft fan is to change the shape of the blade, so that after entering the fan, the air flow has both partial axial flow effect and partial centrifugal effect, so its performance is between axial flow fan and centrifugal fan.
7. High-pressure suction and supply fan can provide medium air pressure and medium air volume, which is suitable for the ventilation system in high-rise civil buildings.
Installation points
1. The fan installation pedestal (foundation, hanger) shall have sufficient strength, stability and durability, and the vibration of the pedestal shall meet the following requirements:
1) The natural vibration frequency of the foundation device shall not be greater than 1/3 of the rotational 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 shall be more than 3 times.
2. Flexible joints shall be set between the fan inlet and outlet and the air duct. The air inlet pipe, air outlet pipe and other devices shall be independently supported and firmly supported by the foundation or other components of the building. The enclosure shall not bear the weight of other components.
3. When the fan is installed on the building components, vibration isolation measures shall be taken.
4. The fan installation can refer to the following national architectural standard design drawings.
5. The high pressure suction and supply fan can be installed on the straight air duct, which has the advantages of convenient connection and small space occupation
To sum up, the high-pressure suction fan is a special fan. It is different from other fans in that the high-pressure suction and supply fans can be connected with pipes for operation. This makes the high-pressure suction and forced draft fan have a broader development space, and can play a very important role in many production links, so it is widely used.