12
Combustion Air Fan
Drive Modes
1. Direct drive
In this concept the motor is coupled
directly to the fan impeller. The fan
impeller is mounted directly on the
motor shaft end. The speeds used are
those of the drive motors only. The bea-
ring of the motor shaft must be specifi-
cally designed for the fan impeller used.
Recommendation: up to 10 MW out-
put
2. Drive via flexible coupling
The fan impeller is mounted on its own
shaft by means of a bearing specifically
designed for the purpose. The power is
transmitted from the drive motor via a
torsionally flexible coupling. The speeds
used are those of the drive motor.
3. V-belt drive
The fan impeller is mounted on its own
shaft by means of a bearing specifically
designed for the purpose. The power is
transmitted from the drive motor via V-
belts which can provide practically any
desired speed.
Air duct and fan
Baseframe: Pre-mount exactly.
Do not prestress for
mounting.
Direction of rotation: Check for proper
direction of
rotation.
Fans with V-belt drive should be chek-
ked for V-belt tension after about 12
hours of operation and the V-belts
retensioned if necessary. If the V-belts
are not properly tensioned this will
cause slip with resultant lower speed
and a considerably reduced service life.
Mount the air ducts in a way to ensure
an accurate and reliable fixing of the
fan. Connect the air duct by means of a
compensator to avoid transmission of
stress. The air ducts are made from 3-4
mm metal sheet.
