News
Zhejiang Yitong Electromechanical Co., Ltd.
07
2023
-
11
Fan working principle
Author:
1. Centrifugal fan
The gas flow enters the rotating blade channel, and the gas is compressed under the action of centrifugal force and flows along the radial direction.
Centrifugal fan is based on the principle of converting kinetic energy into potential energy. It uses high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction to convert kinetic energy into potential energy. 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 causing deceleration. This deceleration converts kinetic energy into pressure energy. The pressure increase mainly occurs in the impeller, and secondly occurs in the diffusion process. In a multi-stage centrifugal fan, the flow of air into the next impeller is used to generate higher pressure.
2. Axial flow fan
After the airflow enters the fan impeller axially, it flows along the axis in the flow channel of the rotating blades. Compared with centrifugal fans, axial fans have the characteristics of large flow, small size and low pressure head. Attention should be paid when they are used for dust and corrosive gases.
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, and then flows into the guide vane. The guide vane turns the signal flow into axial flow, and at the same time introduces the gas into the diffuser pipe, further converts the kinetic energy of the gas into pressure energy, and finally introduces it into the working pipeline.
3. Inclined flow (mixed flow) fan
In the impeller of the fan, the direction of the airflow is between the axial flow and approximately flows along the cone, so it can be called diagonal flow (mixed flow fan. The pressure coefficient of this fan is higher than that of the axial flow fan, and the flow coefficient is higher than that of the centrifugal fan.
When the impeller rotates, the gas enters the impeller axially from the air inlet, and the Bailey beam is pushed by the blades on the impeller to increase the energy of the gas, and then flows into the guide vane. The guide vane turns the deflected gas flow into an axial flow, and at the same time introduces the gas into the diffuser pipe, further converts the gas kinetic energy into pressure energy, and finally introduces the working pipeline.
News
2023-11-07
2023-11-07
2023-11-07
2023-11-07
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