I have a question regarding the rotation direction of the fan pulley – does it have an impact on belt breakdown? ? ?
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I would like to ask everyone: regarding the direction in which a motor drives a fan, the direction of rotation of our air conditioning circulation fans is designed and installed according to Figure 2. There are frequent problems with belt breaks. As far as I understand, the common direction of rotation is that shown in Figure 1. Does this have any impact?
Belt breaks have nothing to do with steering; if you think this might be the case and steering is allowed, then simply reverse the phase of the motor to make it rotate in the opposite direction. Usually, belt damage is caused by misalignment and tension. As for quality, mature manufacturing processes are not taken into consideration at present. For deviation, it’s possible to get a rough idea by looking at the right eye; the key issue is adjusting the tension of the belt. If it’s too loose, the belt rubs against the rotor rapidly, leading to wear and damage ； Being too tight, especially a characteristic of trapezoidal pulleys, means that power transmission is achieved through the contact between both sides of the belt and the pulley; the greater the tension, the deeper the belt sinks into the pulley’s grooves. Whenever the belt is separated from the pulley and subjected to force, it is very easy for tearing to occur on the surface of the belt. It is recommended to make numerous adjustments; finding the optimal pulling force is the key to solving the problem.
Under normal circumstances, steering has little impact on belt wear. The rotation direction of fans is generally designed to be clockwise, in line with the prevailing wind direction in the area where the unit is located. In some areas, the rotation direction of the fans can be set in the opposite direction as required by the manufacturing process. If the fans operate against the wind direction for an extended period, the belt may suffer more wear compared to when they operate in the direction of the wind. It’s possible for each individual to try using a different belt manufacturer’s product for testing. Also, could the tension of the belt be adjusted appropriately?
Figure 2 is correct; the loose edge is on top. Is it over-tightened?
Adjust the pulley counterweight, and make sure the belt tension is not too tight; if you adjust the steering, the fan will rotate in the opposite direction
May I ask whether the loose edge is on top or at the bottom? Is there any particular reason for this?
The steering is not affected; the standards for adjustment and belt tension can be found in HG20203
It’s entirely a problem with belt selection, pulley design, or the pulleys themselves……
There is no doubt that switching to 1 is the right choice
First, check whether the direction of rotation of the motor and fan is correct, then inspect the tension of the belt
In fact, Figure 2 shows the correct orientation – the loose edge is on top and the tight edge is on bottom; I got it wrong before