Centrifugal fan basic knowledge summary (including: principle, structure, outlet direction, blade type, theoretical characteristics)
Release time:2021-11-09
Principle of centrifugal fan
1. The working medium is axially injected into the impeller, enters the blade flow passage, and is transformed into vertical and radial movement of the fan shaft;
2. Under the action of the blade, the medium obtains energy increase: static pressure increases and kinetic energy increases;
3. The medium can be transported if the energy to be raised is sufficient to overcome the resistance.
Centrifugal fan structure
Outlet direction of centrifugal fan
Face up to the fan from the motor side
1. The impeller rotates clockwise: right
When the air outlet is horizontal to the left: 0 ° to the right, and the angle changes clockwise;
2. The impeller rotates counterclockwise: left
When the air outlet is horizontal to the right: 0 ° to the left, the angle changes counterclockwise;
Centrifugal fan blade type
There are four types of centrifugal fan blades: forward, radial, backward and backward wing
1. forward blades have the following characteristics:
1, high pressure
2, low efficiency
3. Easy to scale
2. radial type blade has the following characteristics
1. Simple structure
2, low cost
3, the pressure is higher
4, not easy to scale
5, low efficiency
3. backward type blade has the following characteristics
1. High efficiency, close to wing type
2, can withstand a certain degree of scaling
3. Higher process requirements
4. backward airfoil blade has the following characteristics
1, high efficiency
2. Large flow power self-limiting
3, high cost
4. Cleaning medium required
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