centrifugal fan type
centrifugal fan type
- Types of centrifugal fans can be divided according to different classification standards. The following are several common classification methods and their corresponding types:
- Classification by pressure and function:
- Ventilator: The exhaust pressure is small, not exceeding 0.015MPa.
- Blower: The exhaust pressure is slightly larger, not exceeding 0.2MPa.
- Compressor: The exhaust pressure is relatively high, from 1MPa to over 100MPa.
- Classification by working principle:
- Centrifugal fan: After the airflow enters the impeller axially, it mainly flows in the radial direction, using centrifugal force.
- Axial flow fan: The airflow enters the impeller axially and flows along the axis.
- Rotary fan: uses the rotation of the rotor to change the volume of the air chamber.
- Classification by impeller type:
- Front-jet centrifugal fan: Gas enters vertically from the center of the impeller, with small air volume and low pressure.
- Rear-jet centrifugal fan: There is a nozzle behind the impeller, which produces higher gas pressure and air volume.
- Pull-type centrifugal fan: The impeller is reversed, suitable for processing high-concentration gases containing solid impurities.
- Inclined flow centrifugal fan: The impeller axis forms an angle with the air inlet axis to improve efficiency.
- Classification by characteristics:
- Medium-pressure centrifugal fans: handle a certain amount of air, dust and other impurities, often used in air conditioning and ventilation systems.
- Low-pressure centrifugal fan: air pressure below 50Pa, suitable for heating equipment.
- High-pressure centrifugal fan: strong processing capacity, suitable for special industrial environments.
- Axial flow centrifugal fan: handles low pressure and high flow conditions, suitable for large ventilation and air conditioning equipment.
centrifugal fan type
What is a centrifugal type fan?
- Centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It accelerates the gas through a high-speed rotating impeller, then decelerates and changes the flow direction, converting the kinetic energy into potential energy (pressure). Centrifugal fans are widely used in industrial and mining plants, civil buildings, large public buildings, power plants and other places as supporting equipment for air treatment facilities and hot air circulation facilities.
- The structure of a centrifugal fan mainly includes casing, impeller, shaft, suction port, exhaust port and other components. The impeller is the main working component that generates wind pressure and transmits energy; the casing is used to introduce and discharge gas, and at the same time convert part of the kinetic energy of the gas into pressure energy; the impeller is installed and fixed on the crankshaft, and is connected to the motor through a coupling. The blade type of the impeller has a great influence on the performance of the ventilator. Backward-facing blades have higher efficiency but lower gas flow rate, forward-facing blades have higher gas flow rate but lower efficiency, and radial blades have characteristics between the two. between.
- The working principle of centrifugal fans is based on the principle of converting kinetic energy into potential energy. The gas enters the impeller from the axial direction, is accelerated by the impeller, and then leaves the impeller along the radial direction to do work by the centrifugal force generated. The gas accelerates in the impeller, then decelerates in the diffuser, changes the flow direction, and converts kinetic energy into pressure energy. In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, flows through the impeller and then enters the diffuser. In a multi-stage centrifugal fan, the airflow enters the next impeller through the refluxer, generating higher pressure.
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 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 generating 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 function
- Centrifugal fans are driven fluid machines that are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft of boilers and industrial furnaces; Cooling and ventilation in air conditioning equipment and household appliances; drying and sorting of grains; wind tunnel wind sources and inflation and propulsion of hovercrafts, etc.
- Its working principle is to use a high-speed rotating impeller to accelerate the gas, then decelerate it, change the flow direction, and convert the kinetic energy into potential energy (pressure). 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 and the cross-sectional area of the pipe increases to decelerate the gas flow. This deceleration converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller and secondarily during the pressure expansion process. In multi-stage centrifugal fans, a reflux is used to direct the airflow into the next impeller, creating higher pressure.
Centrifugal fan application
- Industrial Manufacturing: Centrifugal fans are used in many industrial environments, such as steel metallurgy, chemical industry, mining, etc. In these industries, fans are usually used to strengthen air supply, exhaust, refrigeration and hot air systems. Especially in harsh environments such as high temperature, corrosion, dust, etc., centrifugal fans play an irreplaceable role.
- Environmental protection equipment: Centrifugal fans are also widely used in environmental protection equipment, such as sewage treatment, exhaust gas purification, etc. At the same time, centrifugal fans also play an important role in dust removal equipment, incineration equipment and advanced physical noise reduction equipment.
- Construction equipment: In the construction field, centrifugal fans are used in air conditioning, ventilation, hot air and other fields. Through the air supply and exhaust system, they realize the circulation and flow of air and promote the convection and ventilation of indoor air.
- Temperature control: Centrifugal fans can change the ambient temperature by blowing air, so they have important uses in heating, ventilation, air conditioning, drying and other temperature regulation equipment.
- Air purification: In special environments such as laboratories, operating rooms and other places that have strict requirements on air quality, centrifugal fans can be used for air filtration and purification.
- Agricultural cultivation: In agricultural production, centrifugal fans are used to provide a stable air environment for greenhouse plant growth, animal feeding, etc.
- Transportation equipment: In transportation equipment such as trains and ships, centrifugal fans are also used for air circulation.
- Food Processing: In the food processing industry, centrifugal fans are also very commonly used, such as drying equipment, cooling equipment and other food processing technology equipment.
