Centrifugal fans and blowers look very similar from the outside, so many people mistakenly think that the working principles of centrifugal fans and blowers are the same. In fact, the working principles of centrifugal fans and blowers are two different theories.
The centrifugal fan converts kinetic energy into potential energy, and the fast rotating impeller makes the gas faster, and then decelerates and changes the flow direction to convert kinetic energy into potential energy. In the single-stage centrifugal fan, the gas enters the impeller from the axial direction, and the gas flow becomes radial when passing through the impeller, and then enters the diffuser. In the diffuser, the gas will decelerate when the flow direction is changed. At this time, the deceleration will convert the kinetic energy into pressure energy. Much of the pressure change occurs in the impeller and then in the diffuser procedure. In the multistage centrifugal fan, the air flow is allowed to enter the next impeller through the reflux device, resulting in greater pressure.
For the blower, when the motor rotates to guide the impeller of the fan to rotate, the gas in the blades in the impeller will also rotate with it, and these gases will be thrown out under the influence of centrifugal force, and the gas flow will instantly increase, so that the kinetic energy of the gas can be transformed into static pressure energy when flowing, and then with the pressurization of the fluid, the static pressure energy can be transformed into velocity energy, which can be discharged into gas at the exhaust port, Some negative pressure is formed inside the impeller, because the inlet is negative pressure, so that the external gas can be replenished immediately under the influence of atmospheric pressure, and the gas can be discharged and replenished all the time under the influence of continuous rotation of the impeller, which is in line with the purpose of blowing all the time.
