文章来源： 作者：罗茨机电 发布时间：2022-06-20 浏览次数：689
Centrifugal fan mainly consists of impeller, casing, coupling and shaft. The impeller is the main work component that generates wind pressure and transmits energy; The casing is mainly used to introduce and discharge gas, and change part of the kinetic energy of the gas into pressure energy; The coupling is used to connect the motor and fan to transmit torque; The shaft is installed and fixed with the impeller, which is connected with the motor through the coupling. Centrifugal fan is mainly composed of impeller and casing. The impeller of small fan is directly installed on the motor. Medium and large fans are connected with the motor through coupling or belt pulley. Centrifugal fan is generally single-sided air inlet, with single-stage impeller; Large flow can be double-sided air intake, with two back-to-back impellers, also known as double suction centrifugal fan.
Gas discharge: when the impeller rotates, the gas between the blades of the centrifugal fan is discharged from the periphery of the impeller by the kinetic energy (dynamic pressure head) obtained by the centrifugal force, and flows to the outlet of the fan through the guidance of the volute like casing, thus forming a negative pressure in the middle of the impeller, making the external air flow continuously flow in and supplement, so as to discharge the gas from the fan.
Wind pressure reduction: the motor transmits power to the fan impeller through the shaft, and the rotation of the impeller transfers energy to the air. Under the action of rotation, the air generates centrifugal force, and the air diffuses around along the blades of the fan impeller. At this time, the larger the fan impeller, the greater the energy received by the air, that is, the greater the pressure head (wind pressure) of the fan. If the large impeller is cut down, the air volume will not be affected, but the air pressure will be reduced.
Impeller is the main component of fan. Its geometry, size, number of blades and manufacturing accuracy have a great impact on its performance. The impeller can rotate smoothly only after static balance or dynamic balance correction. According to the different direction of blade outlet, the impeller is divided into three types: forward, radial and backward. The top of the blade of the forward impeller is inclined to the rotation direction of the impeller; The blade top of radial impeller is radial, which is divided into straight blade type and curved blade type; The reverse inclination of the blade top of the backward impeller to the rotation of the impeller.
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