In today's industrial and commercial fields, fans are indispensable equipment. They play a vital role in many production processes, environmental control, and the operation of various facilities. Axial flow fans and centrifugal fans are two common types of fans and are widely used in various scenarios. Whether it is a large factory workshop, the ventilation system of a commercial building, or some special industrial production environments, they can be seen.
Performance comparison between axial flow fans and centrifugal fans:
Exhaust direction
Axial flow fan
In the large family of fans, axial flow fans have a unique exhaust method. Its exhaust direction is straight along the direction of the axis, and the air inlet and exhaust port are on a parallel line to the axis. The formation of this exhaust method is closely related to the internal structure of the axial flow fan. When the impeller of the axial flow fan rotates, the air is pushed along the axial direction, just like flowing along a straight channel. Imagine that in a long ventilation duct, if an axial flow fan is used, the air will move quickly along the axial direction of the duct like an orderly team. This direct exhaust method makes the air flow more direct, which is very suitable for some scenes where the ventilation direction requirements are relatively simple and the air needs to pass quickly.
Centrifugal fan
The exhaust direction of the centrifugal fan is completely different from that of the axial flow fan. Its exhaust direction is perpendicular to the air inlet direction, and it can achieve 360-degree exhaust in a specified direction. This feature stems from the working principle of the centrifugal fan. When the impeller of the centrifugal fan rotates at high speed, the air is driven by the impeller to make a circular motion, and then under the action of centrifugal force, it is thrown out from the edge of the impeller, thereby achieving exhaust perpendicular to the air inlet direction. This unique exhaust method gives the centrifugal fan great flexibility. In some complex ventilation systems, such as in the ventilation design of multi-story buildings, centrifugal fans can accurately adjust the exhaust direction to any required direction according to the needs of different floors and different rooms.
Installation difficulty
Axial flow fan
Axial flow fans have obvious advantages in installation, and their installation is relatively simple. Usually, axial flow fans can be directly installed on the wall or connected to the air duct. This is because the structure of the axial fan is relatively compact, the overall weight distribution is relatively uniform, and the requirements for the installation foundation are relatively low. In the actual installation process, you only need to ensure that the installation position of the fan is firm and can withstand the slight vibration generated when the fan is running.
Centrifugal fan
In contrast, the installation of the centrifugal fan is more complicated. The centrifugal fan needs to ensure that the bearing seat and the base are tightly engaged. This is because during the operation of the centrifugal fan, the high-speed rotation of the impeller will generate a large centrifugal force. If the bearing seat and the base are not tightly engaged, it will cause the fan to generate large vibrations during operation, which will not only affect the service life of the fan, but may also cause safety hazards. At the same time, the cutting surface on the base should be properly protected. This is because the cutting surface of the base is the key part to ensure the installation accuracy of the fan. If it is damaged during the installation process, it will affect the balance and stability of the entire fan. When installing a centrifugal fan in a large industrial site, you first need to accurately measure and plan the installation site to ensure that the installation level and verticality of the base are within the specified range. Then, when installing the bearing seat, you need to use special tools to make precise adjustments to ensure the tight engagement between the bearing seat and the base. After the installation is completed, a series of complex debugging work is required, such as checking the rotation balance of the impeller, adjusting the inlet and outlet direction of the fan, etc., to ensure that the centrifugal fan can operate normally.
Air volume and air pressure
Axial flow fan
The air volume of the axial flow fan is large, but the air pressure is small. This feature determines that it is suitable for occasions with short air ducts and small resistance. The large air volume of the axial flow fan is due to the design characteristics of its impeller. The impeller of the axial flow fan usually has a large diameter and thinner blades, which can push a large amount of air flow when rotating. However, due to its structural characteristics, the wind pressure generated by the axial flow fan is relatively small. In the case of a short air duct, the air encounters less resistance during the flow process, and the axial flow fan can rely on a large air volume to meet the ventilation needs. For example, in some simple ventilation duct systems, such as some small workshops or temporary ventilation facilities, the air duct length is short and the air flow resistance is not large, so the axial flow fan can play a good role. It can quickly exchange the indoor air with the outside world to keep the indoor air fresh.
Centrifugal fan
Centrifugal fans have large air volume and air pressure, and are suitable for situations where there are many pipe elbows, long exhaust and air supply distances, and large pipe resistance. The large air volume and air pressure of centrifugal fans are determined by their unique working principle and structural design. When the impeller of the centrifugal fan rotates at high speed, the air is thrown to the edge of the impeller with great force, thereby generating a large wind pressure. At the same time, due to the design of the air inlet and outlet of the centrifugal fan, it can handle a large volume of air per unit time, thereby achieving a large air volume. In some large industrial ventilation systems, such as large power plants or chemical plants, the pipeline system is often very complex, including many elbows and long exhaust and air supply distances, and the air flow resistance in the pipeline is large. In this case, the centrifugal fan can effectively overcome the pipe resistance with its large air volume and air pressure, and transport the air to where it is needed.
Appearance shape
Axial flow fan
The appearance of the axial flow fan is usually cylindrical. This cylindrical appearance design matches its working principle and internal structure. The cylindrical shell can provide a stable space for the rotation of the impeller, and it is also conducive to the flow of air along the axial direction. From the appearance, the cylindrical shell of the axial flow fan is simple and smooth, without too complicated structure. In some places where the space requirements are not high and the ventilation requirements are relatively simple, the cylindrical appearance of the axial flow fan makes it easy to install and layout
Centrifugal fan
The appearance of the centrifugal fan is snail-shaped. This unique snail-shaped appearance is determined by the structure of the impeller and shell inside it. The impeller of the centrifugal fan rotates at high speed inside the shell, and the air is thrown out from the edge of the impeller under the action of centrifugal force, and then gradually discharged along the snail-shaped shell. The snail-shaped shell design can effectively guide the flow direction of the air and improve the working efficiency of the fan. From the appearance, the snail-shaped shell of the centrifugal fan has a certain curvaceous beauty. In some places where there are certain requirements for the appearance of the equipment, such as some modern commercial buildings or high-end industrial plants, the snail-shaped appearance of the centrifugal fan can become a unique design element, which is coordinated with the overall architectural style.
Motor connection method
Axial flow fan
The motor connection of the axial flow fan is generally inside the body of the fan. This connection method makes the overall structure of the axial flow fan more compact. The motor is located in the body and closely cooperates with the impeller and other components. When working, it can directly transmit power to the impeller to drive the impeller to rotate. This compact structural design not only reduces the footprint of the axial flow fan, but also improves the working efficiency of the fan to a certain extent. Since the motor is in the body and protected by the outer shell, it can also reduce the impact of the external environment on the motor and extend the service life of the motor. For example, in some harsh industrial environments, such as workshops with a lot of dust or high humidity, this motor connection method of the axial flow fan can effectively protect the motor and enable it to operate normally.
Centrifugal fan
The motor of the centrifugal fan is connected by a shaft and is usually placed outside the fan exhaust cylinder. This connection method is to adapt to the working principle and structural characteristics of the centrifugal fan. When the centrifugal fan is running, the high-speed rotation of the impeller will generate greater vibration and heat. If the motor is directly installed in the exhaust cylinder, it may be affected by these factors, thereby affecting the performance and service life of the motor. Placing the motor outside the exhaust cylinder can effectively avoid these problems. At the same time, through the shaft connection, the motor can stably transmit power to the impeller to ensure the normal operation of the centrifugal fan.
