fan centrifugal

types of centrifugal fans / fan centrifugal

• According to different impeller types, centrifugal fans can be divided into the following categories:
• 1.Front-spray centrifugal fan: The impeller is of the front-spray type, and the gas enters vertically from the center of the impeller. The air volume is small and the pressure is low. It is often used in small ventilation or air delivery drying equipment.
• 2.Rear-jet centrifugal fan: There is a nozzle behind the impeller, and the incoming gas is sprayed to the back of the impeller, which can produce high gas pressure and air volume. It is suitable for a variety of ventilation, ventilation and heating/cooling applications.
• 3.Pull-type centrifugal fan: The impeller is reversed, which means that the impeller faces outward. It is suitable for processing high-concentration gases containing solid impurities, and can also be used for applications involving higher air flow speeds.
• 4.Diagonal flow centrifugal fan: The axis of the impeller and the axis of the air inlet form a certain angle. After the gas in the air inlet enters the impeller, it is forced to turn to the exhaust port along the diagonal flow channel, so that the gas flows through the impeller. Improve efficiency.
• According to different characteristics, centrifugal fans can be divided into the following categories:
• 1.Medium-pressure centrifugal fans: Centrifugal fans whose main field is the medium-pressure range of 50~300Pa can handle a certain amount of air, dust and other impurities, and are often used in air conditioning and ventilation systems.
• 2.Low-pressure centrifugal fan: The air pressure is below 50Pa. It is mainly applicable to cold winter heating equipment.
• 3.High-pressure centrifugal fans: Centrifugal fans with a main range of 300~3000Pa have strong processing capabilities and high requirements for noise and vibration. They are suitable for oxygen generation, hydroxide escape, catalyst regeneration, etc.
• 4.Axial flow centrifugal fan: The impeller has a spiral line at a 45° angle, which can handle low pressure and high flow conditions. It is the first choice for large ventilation and air conditioning equipment.

Centrifugal fan working principle

• The working principle of a centrifugal fan is to use a high-speed rotating impeller to accelerate the gas, and then convert the kinetic energy into potential energy (pressure) by decelerating and changing the flow direction.
• The centrifugal fan is mainly composed of air inlet, impeller, deflector, casing and motor. When working, the motor drives the impeller to rotate at a high speed, and the gas from the air inlet is sucked into the impeller. After the impeller accelerates the gas, it is discharged through the deflector and casing. The working principle of the centrifugal fan is based on the action of centrifugal force. When the impeller rotates at high speed, the gas is accelerated to the action of centrifugal force, thus creating a pressure difference. The pressure of the gas at the air inlet is low, while the pressure of the gas at the air outlet is high. Therefore, the gas will flow from the air inlet to the air outlet along the pressure gradient.

Centrifugal fan application

• 1.Can be used for ventilation, cooling and dust exhaust:
• (1) Centrifugal fans are widely used and can be used in factories, workshops, warehouses and other departments to ventilate and speed up air circulation to ensure fresh air in these places, which is helpful for the purification of the working environment and the health of workers. At the same time, Equipped with centrifugal fans in factory warehouses to dry the air, it is helpful to preserve mechanical equipment or other industrial products.
• (2) Centrifugal fans can also be used in mines and tunnels to help circulate air in mines and tunnels. Fresh air can re-enter and discharge dirty air in a timely manner. Moreover, centrifugal fans can also play a role in dust removal and help It is used to improve the air transparency in mines and tunnels and improve the working environment of mine and tunnel workers.
• (3) Centrifugal fans can be used in cars, ships and buildings to provide ventilation and promote the replacement of fresh air, so that there is sufficient fresh air inside cars, ships and buildings.
• 2.Ventilation and draft induction:
• At present, centrifugal fans are commonly used in industrial boilers, gas furnaces, and coal-fired furnaces. They mainly play the role of ventilation and draft induction, fully supplying the oxygen-rich air needed for industrial furnace production, allowing the industrial furnace to burn more fully, and the furnace temperature reaches the production level. When needed, it can also improve the production and working environment of industrial furnace rooms and eliminate harmful gases in a timely manner.
• 3.Drying and cooling in agricultural production:
• In large agricultural processing plants, food processing plants and other places, centrifugal fans can inject a large amount of air, promote air flow, promote the drying of grains, wheat, and grain, and facilitate timely storage; centrifugal fans can be used for the selection of impurities such as wheat, grains, etc. After treatment, wheat and grains are purer and have fewer impurities.
• 4.Inflate and push:
• The Longgu centrifugal fan can create artificial wind source. The centrifugal fan can use its own characteristics to create artificial wind to inflate large hovercraft or other inflatable objects, or be used as power to propel the hovercraft forward in the water.
• Centrifugal fans have many functions and uses and are used in pneumatic conveying, sewage treatment, powder conveying, food processing, aquaculture and other industries.

What is a centrifugal fan?

• The centrifugal fan is a ventilation, ventilation or air supply equipment designed and manufactured according to Euler's theorem and the law of conservation of mass. It is a fan that uses the kinetic energy of the rotor to increase the gas pressure, or uses the kinetic energy of the inlet speed to correspondingly reduce the static pressure to reach a certain air volume.
• Centrifugal fans are not only widely used in industrial and civil buildings in air conditioning, environmental protection, refrigeration, heating, drying and other fields, but also have important applications in transportation, mining, metallurgy, energy and other fields. Its main functions are: increasing air pressure, flow, forming airflow, etc.
• The centrifugal fan is mainly composed of a motor, volute, impeller, air inlet and outlet, pipe opening, centrifuge oil plug, inlet air chamber and other components. Among them, the motor is powered by a power supply to drive the impeller to rotate; the impeller is the core part of the centrifugal fan. Its speed, impeller outer diameter, blade angle and other factors will affect the gas flow and wind pressure of the centrifugal fan. At the same time, the material of the impeller also affects the use of the centrifugal fan. Lifespan and reliability are greatly affected.
• The function of the volute is to convert the kinetic energy of rotation into static heat energy, thereby increasing the air pressure; the air inlet and outlet are used to introduce and discharge gas; the pipe opening is used for pipe connection to facilitate gas transportation; the centrifuge oil plug is used to lubricate the centrifuge bearings to reduce wear; the inlet air chamber is used to increase the inlet kinetic energy and eliminate the difference in upper and lower wind speeds.
• The most common types of centrifugal fans include single-suction centrifugal fans, double-suction centrifugal fans, centrifugal fans with guide vanes, centrifugal fans without guide vanes, diagonal flow centrifugal fans, centrifugal fans, and centrifugal fans.
• Features
• 1.Generate greater air volume and pressure: Because the centrifugal fan adopts centrifugal force in physical principles, it can produce greater air volume and pressure, thereby achieving more effective ventilation and exhaust.
• 2.Simple structure: Compared with other ventilation equipment, the centrifugal fan has a very simple structure and is very convenient to use and maintain.
• 3.Various models: There are many models of centrifugal fans to meet the needs of different occasions, such as: single suction centrifugal fan, double suction centrifugal fan.