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11

2023

Which of centrifugal fan and axial fan has strong suction

Which 1. centrifugal fan or axial fan has strong suction Axial flow fan and centrifugal fan under the same power, centrifugal fan suction. The difference between axial flow fan and centrifugal fan: Axial fan: large flow, small pressure head; centrifugal fan, large pressure head, small flow. Axial fan airflow direction perpendicular to the direction of rotation of the blades, centrifugal fan airflow direction cut in the direction of rotation of the blades

11

2023

The efficiency of the centrifugal fan is generally how much

The efficiency of 2. centrifugal fan is generally how much The motor efficiency of the centrifugal fan is generally 50% -90%, and the larger the fan motor efficiency is higher. The blowing efficiency of the fan is estimated to be 30%-80%, that is, 30% - 80% of the mechanical energy generated by the motor can be converted into wind energy.

11

2023

Model of fan

The meaning of the centrifugal fan model: it consists of the basic model and the supplementary model. If the basic model of the fan is the same, but the purpose is different, for the convenience of distinction, add "G" or Y "and other symbols before the basic model. "G" represents a blower (blower) and "Y" represents an induced draft fan. The supplementary model consists of two digits. The first digit indicates the suction type of the fan inlet, which is represented by "0", "" and "2", where "D" represents double suction fan: "1" represents single suction fan; "2" represents two-stage series fan. The second digit represents the design number. The complete representation of the fan model includes: name, model, machine number, transmission mode, rotation direction, outlet position and so on.

11

2023

Fan working principle

1. Centrifugal fan The gas flow enters the rotating blade channel, and the gas is compressed under the action of centrifugal force and flows along the radial direction. Centrifugal fan is based on the principle of converting kinetic energy into potential energy. It uses high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction to convert kinetic energy into potential energy. In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to the radial direction when the gas flows through the impeller, and then enters the diffuser. In the diffuser, the gas changes its flow direction causing deceleration. This deceleration converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, and secondly occurs in the diffusion process. In a multi-stage centrifugal fan, the flow of air into the next impeller is used to generate higher pressure.

11

2023

Fan type

1. Centrifugal Compressor Advantages 1. The centrifugal compressor has large air volume, simple and compact structure, light weight, small unit size and small footprint. 2. Balanced operation, reliable operation, high operation rate, less friction parts, less spare parts, less maintenance costs and less personnel. In the chemical process, the centrifugal compressor can be absolutely oil-free compression process for chemical media.

11

2023

What is the fan

The fan is a machine that relies on the input of mechanical energy to increase the gas pressure and send the gas side by side. It is a kind of driven fluid machinery. Fans are widely used for ventilation, dust removal and cooling in factories, mines, trails, cooling towers, vehicles, ship tires and buildings, ventilation and air induction in silver furnaces and industrial furnaces, cooling in air conditioning equipment and household appliances, drying and selection of ventilation grains, wind tunnel air sources and inflation and propulsion of hovercraft, etc.

11

2023

Selection of Tunnel Fan

1. calculation of ventilation required in tunnel 2. calculation of total thrust required 1. Tunnel air inlet resistance and air outlet resistance 2. Tunnel surface friction resistance, resistance caused by suspension fan device, bracket and road sign, etc. 3. Traffic resistance 4. The resistance caused by the pressure difference between the entrance and exit of the tunnel due to different temperature, air pressure and wind speed

11

2023

How to repair the centrifugal fan

1. Wind wheel After the long-term operation of the centrifugal fan, the wind wheel will have different degrees of wear and some foreign matter due to corrosion from different gases. Some maintenance personnel found that the wind wheel was corroded and punctured, and the perforation was repaired with a book iron. However, after such maintenance, but when installing the fan, you will find that it cannot maintain balance. Some maintenance personnel concluded that the fan was not installed after the machine was disassembled or the fan could not be reinstalled. The reason is that the maintenance staff is working on the problem and the wind wheel is unbalanced. Each wind wheel is balanced when leaving the factory, because even if corrosion occurs, the wind wheel will move at high speed. The degree of corrosion of the entire rotor is the same or different. If the wind wheel is found to be unbalanced or corroded, you can see if the user is changing the wind wheel.

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