Why does the negative pressure fan make noise? How to deal with it?

Update:09-08-2019
Summary:

The noise of the negative pressure fan is really annoyi […]

The noise of the negative pressure fan is really annoying, but why does the negative pressure fan make noise? How to solve it? Have you considered this? Let us look at it together.

 

Reason 1: When the negative pressure fan is installed, the contact with the window frame is too tight, so that the window frame resonance occurs when the negative pressure fan is running.

Solution: Reduce the packing between the window frame and the water air conditioner properly, and use a softer material to fill it. If the bottom of the installation is not stable, the bottom plate should be stabilized and placed securely and securely.

 

Reason 2: The negative pressure fan is not properly installed, and the negative pressure fan should be installed in a suspended state. The spring of the foot bolt cannot be crushed.

Solution: Ask the maintenance personnel to adjust the installation status of the negative pressure fan to make it in suspension.

 

Reason 3: The anti-vibration pad or the fixing screw of the negative pressure fan base is screwed too tightly, and the vibration-absorbing effect is lost.

Solution: Adjust the screw tightness of the damping pad of the negative pressure fan base to make the base surface smooth.

 

Reason 4: The power supply voltage is too low, and abnormal sound and vibration are generated when the negative pressure fan is started or running.

Solution: Control the power supply voltage within the rated voltage range. A voltage regulator or power regulator can usually be used to stabilize the voltage.

 

Reason 5: The negative pressure fan blades collide with the fan casing (cover).

Solution: Adjust the blades.

 

Reason 6: The motor bearing of the negative pressure fan is poor, the screw of the axial fan is loose, the fan blade is not fixed on the shaft, and the gap between the top of the fan blade and the hood is too small.

Solution: Replace the negative pressure fan motor bearing to tighten the screws on the axial fan base and the shaft. According to the production technical requirements, the distance between the tip of the blade and the casing is generally not more than 1.5% of the length of the blade.

 

Reason 7: The base screw of the negative pressure fan is loose, the impeller assembly is poor, the rotation speed is too fast, and the fixing screws on the shaft are loose.

Solution: Fasten the fan base of the negative pressure fan and the screws on the shaft. Reassemble and adjust the impeller clearance according to technical requirements.

 

Of course, if you can't solve the noise of the negative pressure fan, you need to contact the professional technical maintenance personnel to avoid affecting the use!