How centrifugal fans and axial fans operate

When the fan is working, the airflow enters the blade space from the fan axially, and then rotates with the impeller under the drive of the impeller; On the other hand, a fan that increases energy under the action of inertia, leaves the impeller along the radius direction, and relies on the centrifugal force generated to do work is called a centrifugal fan. Centrifugal fans are based on the principle of converting kinetic energy into potential energy, using a high-speed rotating impeller to accelerate the gas, then slow down and change the flow direction to convert kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to a radial direction as it flows through the impeller, and then enters the diffuser.

In a diffuser, the gas changes the direction of flow causing a deceleration, which converts kinetic energy into pressure energy. The increase in pressure occurs mainly in the impeller and to a lesser extent in the expansion process. In a multistage centrifugal fan, a reflux is used to allow the air to flow into the next impeller, creating a higher pressure.

When the impeller rotates, the gas enters the impeller axially from the air inlet, and the energy of the gas rises due to the push of the blades on the impeller, and then flows into the guide vane. The guide vanes deflect the gas flow into axial flow, while the gas is directed into the diffuser tube, which further converts the kinetic energy of the gas into pressure energy and finally into the working line.

Axial wind turbine blades work in a similar way to the wings of an aircraft. However, the latter is to act lift upwards on the wings and support the weight of the aircraft, while axial fans fix the position and move the air.

The cross-section of an axial fan is generally a wing profile. The blades can be fixed in position or rotate around their longitudinal axis. The angle of the blades to the airflow or the distance between the blades can be non-adjustable or adjustable.

Changing the angle or spacing of the blades is one of the main advantages of axial fans. A small blade spacing angle produces a lower flow rate, while an increased spacing results in a higher flow rate.

Advanced axial fans are able to change the blade spacing while the fan is running (which is quite similar to the first rotor) and thus change the flow rate accordingly. This is called a V-Blade Adjustable (VP) axial fan.

It's all by electricity, and when it is connected, it will be turned. Or if you blow with your mouth, the leaves will move.

Hello, pro, the advantages and disadvantages of axial fans and centrifugal fans. Axial fan and centrifugal fan are two common types of fans, each of which has its own shortcomings, which are introduced below: Axial fan:

Pros:1Large air volume:

The impeller of the axial fan adopts the arrangement that the shaft is parallel to the inlet and outlet of the fan, and the air volume is large, which is suitable for ventilation and heat dissipation of large air volume. 2.Low wind pressure:

The axial fan has low air pressure and is suitable for occasions with low airflow resistance. 3.Smooth Operation:

The speed of the axial fan impeller is relatively low, the operation is stable, and the noise is low. Cons: 1

Can not produce high air pressure: Axial fans cannot produce high air pressure, so they cannot be used in situations with high air resistance. 2.

Low efficiency: Axial fans have low efficiency at low wind speeds and little change in efficiency when the flow rate varies widely. Centrifugal fan:

Pros:1High wind pressures can be generated:

Centrifugal fans have high air pressure and are suitable for applications with high airflow resistance. 2.High efficiency:

The centrifugal fan has high efficiency at low wind speed, and the efficiency of the mu banquet does not change much when the flow rate varies widely. Cons: 1

High noise: The impeller speed of the centrifugal fan is relatively high, and the noise is large. 2.

Small air volume: The air volume of centrifugal fans is smaller than that of axial fans, which is suitable for ventilation and heat dissipation with small air volumes. 3.

Unstable operation: The centrifugal fan impeller speed is high, the operation is unstable, and balancing measures need to be installed. To sum up, axial fans and centrifugal fans have their own advantages and disadvantages, and should be selected according to actual needs.

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The main differences between centrifugal fans and axial fans are:

1. The centrifugal roof fan changes the flow direction of the medium in the air duct, while the axial roof fan does not change the flow direction of the medium in the air duct;

2. The former is more complicated to install;

3. The former motor and the fan are generally connected by a shaft, and the latter motor is generally in the fan;

4. The former is often installed at the inlet and outlet of the air-conditioning unit, boiler drum, induced draft fan, etc. The latter is often installed in the duct or at the front of the duct outlet.

Centrifugal roof fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas, it is a driven fluid machine. Centrifugal fans are widely used for ventilation, dust removal and cooling in factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced air for boilers and industrial furnaces; cooling and ventilation in air-conditioning equipment and household appliances; drying and selection of grains; Wind tunnel wind source and hovercraft inflation and propulsion, etc.

The axial roof fan is the airflow in the same direction as the axis of the fan blades, such as an electric fan, and the fan of the air conditioner is the axial flow fan. It is called "axial flow" because the gas flows parallel to the fan axis. Axial fans are typically used where the flow requirements are high and the pressure requirements are low.

Axial fans hold the position and move the air.

The centrifugal fan mainly changes the flow direction of the medium in the air duct, while the axial fan cannot change the flow direction of the medium, which is also the most important difference between them. Moreover, the air volume and air pressure of the centrifugal fan are very large, but the air pressure and air volume of the axial fan are much smaller.

People who have experience in installation have already summarized it. The installation of centrifugal fans is very complicated, while the installation of axial fans is very simple, and the installation cycle is also very short. There is also a certain difference between the installation of centrifugal fans and axial fans, which users can see for themselves, the motors of centrifugal fans are connected with the fans through the shaft, and the fans of axial fans are directly installed inside the fans.

1. If the flow direction of the wind is parallel to the shaft, it is called an axial fan.

2. Centrifugal fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas, which is a driven fluid machinery.

The difference between a centrifugal fan and an axial fan is:

1. The centrifugal fan changes the flow direction of the medium in the air duct, while the axial fan does not change the flow direction of the medium in the air duct.

2. The former has a large air volume and wind pressure, while the latter has a very low air volume and wind pressure.

3. The former is more complicated to install, and the latter is simpler to install.

4. The former motor and the fan are generally connected by a shaft, and the latter motor is generally in the fan.

5. The former is often installed at the inlet and outlet of the air-conditioning unit, boiler drums, induced draft fans, etc., and the latter is often installed.

In the middle of the duct or at the front of the duct outlet.

Axial fans and centrifugal fans are two different products in the fan category, and their main function is also to ventilate the air in the environment.

First, the exhaust direction is different

The exhaust direction of the axial fan is straight along the axis, the air inlet and outlet of the fan are on parallel axes, and the exhaust direction of the centrifugal fan is perpendicular to the air inlet, which can achieve 360 degree exhaust in the specified direction.

Second, the difficulty of installation is different:

The installation of axial fans is relatively simple, generally directly installed on the wall or connected to the air duct. The centrifugal fan is complex to install.

3. The difference between air volume and wind pressure:

The air volume and air pressure of the axial fan are relatively small, and there is basically no air pressure, while the air volume and air pressure of the centrifugal fan are relatively large. If there are many pipe elbows, the exhaust distance and the air supply distance are relatively long, and the pipeline resistance is large, it is necessary to use a centrifugal fan.

Fourth, the appearance and shape are different:

The shape of the axial fan is basically cylindrical, and the shape of the centrifugal fan is sneety.

Fifth, the connection of the fan motor is different:

The motor connection of the axial fan is usually in the body of the fan, and the motor of the centrifugal fan is connected through the shaft, usually outside the exhaust duct of the fan.