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2019-11-25

Definition for Centrifugal Fan

Centrifugal fan is a kind of driven fluid machine which relies on the input mechanical energy to improve the gas pressure and send gas side by side.Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships and buildings for ventilation, dust removal and cooling;Ventilation and ventilation of boilers and industrial furnaces;Cooling and ventilation in air conditioning and household appliances;Drying and selection of grain;Wind tunnel air source and aeration and propulsion of hovercraft.

 

According to the principle that kinetic energy is converted into potential energy, a centrifugal fan uses a high-speed rotating impeller to accelerate the gas, then decelerate and change the direction of flow, so that kinetic energy is converted into potential energy (pressure).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 flow direction of the gas is changed and the flow is slowed down by the increase of the section area of the pipe. This deceleration action converts kinetic energy into pressure energy.The pressure increase mainly occurred in the impeller, followed by the diffusion process.In a multistage centrifugal fan, the flow of air into the next blade is driven by a reflux to generate higher pressure.

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