【 Weak current College 】 Central air conditioning fan maintenance analysis---Power By 【 China power house network 】

In the central air conditioning ventilation system, fans will be treated to air transportation, the room was transferred to the air a little boost. Central air conditioning generally use centrifugal fan, fan pressure is large, it will air transportation to more distant was the room.

Now to explain some of the fan favorite maintenance knowledge and methods:

1, concentricity

Concentricity refers to the fan shaft and bearing between concentric. Because the fan is running in the air pressure is high, therefore, on the strict concentricity, concentricity deviation easily lead to excessive noise or excessive bearing wear, affecting the operation of fan performance and service life.

Adjust the concentricity of the method:

First tighten the bolt ends housings, and then hands gently rotating fan, if you find housings have swing can nudge housing location or increase or decrease in the gasket (gasket available 0.1mm copper tablets), until the fan rotational flexibility. Adjust the position after the fan, then suddenly goes down, if fan using inertia can still rotate freely, concentricity requirements has been reached.

2. fan balancing

Fan noise and fan of dynamic balance, so the balance is good or bad is a measure of standard of product quality. Although the factory manufactures dynamic balancing on the blower for a surveyor, but because of the removal process runs, bump or long-term balance weight block is easy to fall and result in uneven. At this point, the maintenance staff available plasticine-small, dynamic balancing a rushes, verify the weight blocks available after welding.

In addition, surfacing electrodes available to address the dynamic balance of weight, or specialized manufacturers for balancing the repair.

3, bearing wear and

Bearing wear mostly due to the lack of oil, dry, clearance is too small, poor concentric tide is an important factor bearing wear.

Wear, available back-burningcast babbit, generally wear can be lapping scraper lapping, bearing PIPs in uniform, and less abrasive, break-in pips 2/3.

4 ball bearing

Ball bearing damage, normally need to be replaced. Replace the front, with aviation gasoline or high-quality petrol to be clean, and coloured bearing oil. Mounted ball bearing copper rod, bearing inner ring, beat never beat outer ring or hand hammers beating the bearing inner ring directly, nor can it use oxygen flame heating solutions assembled bearing. In addition, it should be noted that protection of spindles and mating surfaces to prevent scratches.

5. drive belt

Fan in general use belt drive, due to the use of long, loose belt easy stretch, this belt is easily slipping, and to influence the amount of wind, so you will need to replace the belt. If using multiple root belt drive, even if only one stretch loose, you need to replace all.

In addition, ventilator and motor pulley which should be in the same plane, otherwise the drive belt in the wheel tank wear, abrasion, and belt easy fault. General fan is not easy to reach, so much from the adjustment motor position.

Adjustment method:

The motor in four foot bolts slightly loosened, cable snaps fan pulley and motor pulley side, using crowbar nudge motor until they snap in line. And then the motor base bolted on, last used line review.

6, fan noise

Fan noise include mechanical noise and aerodynamic noise, mechanical noise is due to the impeller, shaft, bearing wear long lack of oil, the gap increased, solutions based on the above. Aerodynamic noise due to air flow and air friction, or wind speed on the high side.

Reduce aerodynamic noise of method:

Can additional muffler or enlarge reduce wind speed wind pipe dimensions. In the ongoing maintenance of regular refuelling, cleaning, periodically check the anchor bolt is loose, the stress situation is qualified shock absorber, bearing temperature (60 ° c) normal, fan blade is collision, identify problems, should be resolved in a timely manner.

Of the above, the only fan favorite repair of sense and means, in practice, should be based on a case-by-case flexibility.