How to adjust centrifugal fan to the best efficiency?

Under different condition, the centrifugal fan efficiency is different. 

1. Full-voltage starting or reduction voltage starting are both OK for centrifugal fan,but the electric current of full-voltage starting is about 5 to 7 times to the rated current. 
When electrical capacity is insufficient, reduction voltage starting is better.

2. Before centrifugal fan commissioning, check whether the wiring methods are consistent with the wiring diagram; whether the working voltage of power supply is conform to the requirements; whether the power supply is lack of phase; whether the capacity of electrical components meet the requirements.

xianrun blower centrifugal fan

3. At least two professional persons check centrifugal fan commissioning, one controls power supply,the other observes the blower working. Stop the centrifugal fan immediately and check for any abnormal phenomena; during the blower running, check the rotation direction firstly; check whether every phase running current is more than rated current.  
Stop running after five minutes, and confirm no abnormal phenomenon, then start operation.

4. Check whether the input current is normal when the fan speed reach normal speed, and centrifugal fan running current should not exceed rated current.If the current exceeds its rated current operation, check whether the supply voltage is normal.

adjust centrifugal fan

5. Centrifugal fan motor power is the biggest power when wind chassis and air inlet open fully. It is better to close the valves of the inlet duct and outlet duct in advance, during the centrifugal blower commission, then open the valves gradually to achieve the required conditions, and and pay attention to whether the working current is more than rated current.

Main shaft and coupling maintenance

Keep the main shaft clean,and remove dirt from shaft shoulder every year;

Please pay attention to the place where main shaft passes through shaft end seal of inlet chamber side plate, because condensation of small amount of air leakage will probably corrodes the place; 

centrifugal blower coupling

If the centrifugal blower runs for a while under unbalanced state, make straightness inspection to main shaft as far as possible;

Keep the coupling clean, and check the coupling connecting and fastening situation regularly. 

coupling drive centrifugal fan

Xianrun Blower-Exported to Japan

high pressure centrifugal fan

Item: Centrifugal air blower,
Air Capacity: 2280 m3/h ,
Pressure: 12000 Pa, 
Motor: Variable frequency motor. 
Noise measures: Silencer, 
Air temperature :250 degree centigrade. 
This is a customized fan, the most difficult is the high temperature 250 degree centigrade, so our engineers design this blower with special material.

xianrun centrifugal blower

Centrifugal Fan Maintenance---Casing and Inlet Box Maintenance

Centrifugal Fan Casing and Inlet Box Maintenance

Checking whether there are serious abrasions in casing and inside of inlet box at fixed period;

centrifugal fan air inlet box 

Cleaning the dust accumulation regularly; 

Checking whether the fastening bolts are tight regularly;

centrifugal fan casing

Compressing the foundation spring to the specified installation height of the drawing. 

Centrifugal Fan Impeller Maintenance

Centrifugal fan impeller is rotatable parts of centrifugal fan, and it sends air to air outlet. The impeller is composed of blades, front plate with import lap, rear plate.The arc plate blades have radius of curvature. 

centrifugal fan impeller

At the beginning of impeller rotation, or regular checking, please check whether the impeller is fixed on shaft shoulder tightly, and whether there are crack, wear, dirt retention in impeller. 

If possible, keep the impeller clean, and brush off dust and rust scale by wire brush. As the lengthen of running time, the dust is attached to the impeller unevenly. All that will destroy impeller balance and cause rotor fluctuations. 

The impeller need to made dynamic balance for any repair. Please make sure all the holding screws and bolts are tight before dynamic balance. Because the impeller had been running for a long time under the imbalance, the holding screws and bolts may become flexible. 

centrifugal fan impeller 

Check the axial position of the impeller according to fan installed distribution and the size of current collector in impeller import lap. Check the radial clearance between current collector and impeller import ring. 
If necessary, adjust the current collector or chassis to get the correct clearance space,to ensure that the side plates of casing inlet are in the correct position. 
Check and make sure that the position of casing, air inlet, outlet conform to requirements of the drawings and connection ducts. 

centrifugal fan wheel

http://www.lxrfan.com/products_info/Custom-heavy-Duty-Industry-Fan-from-China-Supplier-330147.html

http://www.lxrfan.com/products_info/Custom-heavy-Duty-Industry-Fan-from-China-Supplier-330147.html

How to maintain high temperature smoke exhaust fan and prolong service life?

High temperature smoke exhaust fans are widely used in ventilation system. The below are several maintenance methods.

high temperature smoke exhaust fan

1. Adding lubricating grease regularly, from zerk fitting by fuel truck nozzle. You can open the oil discharge outlet under motor cover to discharge waste oil. 
If there is oil starvation in the bearings, please check out the reason firstly, and add oil at any time. 

2. High temperature smoke exhaust fan starts to run at least once a month, so as to have good motor bearing lubrication. 

3. It is better to check attachment bolt regularly. Once the loose, spring washers have to be changed and fasten again. 

high temperature smoke exhaust fan

4. Checking fan running situation at fixed period, if there are any friction, loose and strenuous vibration,then check out the problems carefully and remove the obstacle. 

5. Inspecting the bearing of the high temperature smoke exhaust fan. Toggle the impeller, listen whether there are any sounds of bearing's looseness and friction, then  remove the trouble.