Working Principle Of Axial Flow Fan

The impeller of the axial flow fan produced by Foshan Nanhai Jiuzhou Pratt&Whitney Fan Co., Ltd. adopts unique technology, which makes the impeller have very strong impact resistance and high strength stability during operation, and can greatly improve the efficiency of the impeller; At the same time, special bearing materials are used to make it have good wear resistance. Axial flow fans are mainly used for ventilation and dust removal in metallurgy, chemical industry, building materials, light industry, food and other industries. It can transport gas or other suspended substances without solid particles under negative pressure. It can be widely used in various high-temperature and high-pressure equipment and devices.

Axial flow fan has a wide range of applications. The air flow in the same direction as the axis of the fan blade, such as the electric fan, and the external fan of the air conditioner is an axial flow fan. The reason why it is called "axial flow type" is that the gas flows parallel to the fan axis. Axial flow fans are usually used in situations where flow requirements are high and pressure requirements are low. The axial flow fan is fixed in position and moves the air. Axial flow fan is mainly composed of fan impeller and casing, with simple structure but high data requirements.

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1、 Working Principle Of Axial Flow Fan

When the impeller rotates, the gas enters the impeller axially from the air inlet and is pushed by the blades on the impeller to increase the energy of the gas, which then flows into the guide vane. The guide vane changes the deflection gas flow into axial flow, and at the same time, the gas is introduced into the diffuser to further convert the gas kinetic energy into pressure energy, and finally introduced into the working pipeline. In this way, the energy transfer of the gas in the flow process is realized.

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If the flow of the fan is large, and the pressure of the fan is also large, the gas needs to be transported through pipes to meet this flow. At this time, it is necessary to consider the resistance loss of the pipe, because in this case, the pipe pressure loss is greater than the impeller diameter loss.

At this time, the internal pressure of the fan can be reduced by using two methods: the internal resistance of the fan is small and the external resistance is small.

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At this time, the axial flow fan or axial flow pump with larger impeller diameter can be selected.

Axial flow fan blades work in a similar manner to aircraft wings. However, the latter is to apply lift to the wing and support the weight of the aircraft, while the axial flow fan is fixed and moves the air.

The cross section of axial flow fan is generally the wing section. The blade can be fixed in position or rotated around its longitudinal axis. The angle between the blade and the air flow or the blade spacing can be non adjustable or adjustable. Changing blade angle or spacing is one of the main advantages of axial flow fans. The small blade pitch angle produces a lower flow rate, while increasing the pitch produces a higher flow rate. In axial flow fan, due to the increase of impeller diameter, the lift on the blade increases, so the blade in the impeller structure will have a large area, even reaching the limit of blade material.

Axial flow fan is usually composed of air duct, impeller assembly and motor. The impeller takes the leading position. The gas is separated from the air flow by mechanical means and conveyed to the outlet of the air duct. The motor drives the fan blades to rotate and sends the air volume into the fan.

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Since the blade of axial flow fan is relatively small (usually 1/2 of the blade diameter), the effective area of impeller is also small. Since the impeller and fan blade are arranged in the same direction, it is called feathering ventilation.

In order to meet certain air volume requirements, metal materials or glass fiber materials are generally used as the main structural materials of the air duct, and a certain number of impellers are required to form a working chamber (commonly referred to as The Fan Chamber).

Two rotors and a pair of balance shafts are installed in the fan chamber. The motor drives the rotor to rotate (when the rotor rotates, the impeller drives the air duct to rotate and change the air flow direction), so that the gas can obtain lift.

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The advanced axial flow fan can change the blade spacing when the fan is running (which is quite similar to the helicopter rotor), so as to change the flow accordingly, which is called the movable blade adjustable (VP) axial flow fan.

Axial flow fan, also known as local fan, is a kind of fan commonly used in industrial and mining enterprises, but it is different from the general fan. Its motor and fan blade are all in a cylinder, and the shape is a cylinder. It is used for local ventilation. It is easy to install, has obvious ventilation effect, and is safe. It can connect the cylinder to send the air to the designated area.

Kyushu Pratt&Whitney Group

Hotline/WeChat: 13676219124

Introduction: Jiuzhou Pratt&Whitney Group, founded in 1996 and headquartered in Nanhai District, Foshan City, is a high-tech enterprise integrating R&D, production, sales and service.

Its main products include: industrial fans, environmental friendly air conditioners (air coolers), atomizing cooling machines, fresh air systems, motors, etc.

Now it has become the largest general machinery production base with the most complete product series in the same industry in China.