centrifugal fan working principle

centrifugal fan application / centrifugal fan working principle

• Centrifugal blower is a commonly used fan equipment. Its main purpose is to transport, circulate, pressurize or discharge air, gas or dust and other substances. It is widely used in industry, construction, metallurgy, chemical industry, electric power, environmental protection and other fields. The following are the main uses of centrifugal blowers:
• 1.Ventilation: Centrifugal blowers can be used for ventilation in buildings to eliminate indoor odors, moisture, and turbidity, and keep indoor air fresh and comfortable.
• 2.Heating and cooling: Centrifugal blowers can be used as part of a heating or cooling system to regulate the temperature of a room or equipment by circulating air or conducting heat.
• 3.Enhance combustion: The centrifugal blower can be used to pressurize the gas combustion during the combustion process to improve combustion efficiency and combustion stability.
• 4.Air guide and exhaust: Centrifugal blowers can be used in air guide ducts or systems to provide gas power for other machines or equipment, and can also be used to discharge waste gas, flue gas or dust.
• 5.Dust removal and cleaning: Centrifugal blowers are often used in dust removal systems in industrial production. By generating strong wind, dust or other pollutants in the discharged materials are collected and filtered to keep the air clean.
• 6.Drying and drying: Centrifugal blowers can be used in the drying and drying process in industrial production to take away moisture from the surface of materials through wind force and speed up the drying speed.
• 7.Gas supply boosting: Centrifugal blowers can be used to pressurize or supply gas, such as oxygen supply systems, compressed air supply, etc.
• 8.Metallurgical process: Centrifugal blowers are widely used in the metallurgical industry, such as ventilation, blasting and pressurization of metallurgical furnaces, blast furnaces, steel-making furnaces, etc.

How does a centrifugal blower work?centrifugal fan working principle

• The working principle of a centrifugal blower is to use the centrifugal force generated by a working wheel equipped with many blades to squeeze the air to achieve a certain air volume and pressure.
• When the motor rotates, the impeller rotates with it. When the impeller rotates, it generates centrifugal force to throw the air out of the impeller. The air is collected in the casing. Due to the slow speed and high pressure, the air is discharged from the ventilator outlet and flows into the pipe. When the air in the impeller is discharged, a negative pressure is formed. The air outside the suction port is forced into the impeller under the action of atmospheric pressure, so that the impeller continues to rotate and the air continues to flow in the pipe under the action of the ventilator.
• Specifically, the working process of the centrifugal blower can be divided into the following steps:
• ‌Gas entry‌: Gas enters the impeller from the axial direction, and the impeller rotates at high speed to generate centrifugal force.
• Gas acceleration‌: The gas is affected by centrifugal force in the impeller, is accelerated and thrown toward the casing.
• ‌Kinetic energy conversion‌: The gas decelerates in the diffuser, kinetic energy is converted into pressure energy, and the pressure increases.
• ‌Gas discharge‌: Gas is discharged from the ventilator outlet and enters the pipe.
• ‌Circulation‌: Due to the negative pressure caused by the outflow of gas, outside air is automatically replenished and enters the impeller, and the cycle proceeds‌.

centrifugal fan working principle

Types of centrifugal fans

• The types of centrifugal fans mainly include the following: single-suction centrifugal fans, double-suction centrifugal fans, high-pressure centrifugal fans, static pressure box-type centrifugal fans and medium-pressure centrifugal fans‌. Each of these types of centrifugal fans has its own specific application scenarios and performance characteristics.
• ‌Single-suction centrifugal fan‌: Single-suction centrifugal fan, also known as front-suction centrifugal fan, is suitable for transporting general gases and has a small air volume range.
• Double-suction centrifugal fan‌: Double-suction centrifugal fan, also known as rear-suction centrifugal fan, is suitable for use when pressure is high, air volume is large, and starting torque is small.
• ‌High-pressure centrifugal fan‌: High-pressure centrifugal fan is mainly used to transport high-pressure gas, such as blowers, compressors, etc.
• ‌Static pressure box-type centrifugal fan‌: often used to eliminate noise and vibration during work and increase air volume and wind pressure.
• Medium-pressure centrifugal fan‌: Suitable for transporting gases with high dust content, high flue gas temperature or condensation water, etc.
• In addition, centrifugal fans can be further subdivided according to different classification standards. For example, according to pressure and function, there are ventilators, blowers and compressors; according to working principles, there are centrifugal fans, axial fans and rotary fans. Each type of fan has its own unique design and applicable scenarios to meet different industrial and civil needs‌.

centrifugal fan working principle

What is the difference between a centrifugal fan and a blower?

• The main differences between centrifugal fans and blowers are their working principles, application scenarios, pressure and flow characteristics, and efficiency and energy consumption. ‌
• The working principle is different‌. The centrifugal fan relies on a high-speed rotating impeller to generate centrifugal force to accelerate and discharge the gas. The gas gains kinetic energy under the action of the impeller and is discharged. A blower also uses centrifugal force generated by an impeller to move air, but its design is usually more compact and suitable for achieving high air flow at lower pressure.
• The application scenarios are different. Centrifugal fans are widely used in factory ventilation, cooling towers, vehicle and ship ventilation, boiler and industrial furnace ventilation and other fields. Blower blowers are typically used in applications that require higher air flows, such as forced-air heating systems, air conditioning equipment, and industrial drying.
• ‌Pressure and flow characteristics are different‌. The exhaust pressure of centrifugal fans is low, but the flow rate is large. It is suitable for occasions where the pressure requirement is not high but a large amount of air flow is required. Blower, on the other hand, can achieve higher airflow at lower pressure and is suitable for applications requiring high airflow.
• Efficiency and energy consumption are different. While centrifugal fans can achieve higher efficiencies, blowers are more efficient in applications that require high airflow at lower pressures because their compact design and high-speed operation help save energy.