1. The centrifugal fan fan blades are corroded or worn severely;

 

2. The fan blades do not run after assembly, and the shaft is bent due to the weight of the impeller and the main shaft;

 

3. Uneven attachments on the impeller surface, such as rust, dust or asphalt;

 

4. Transportation, installation or other reasons cause the impeller to deform and cause the impeller to lose balance;

 

5. The balance block on the impeller falls off or the balance is not found after inspection;

 

Solution:

 

1. Repair or replace;

 

2. Re-inspect. If it is not used for a long time after assembly, it should be rotated regularly to prevent the shaft from bending;

 

3. Remove attachments;

 

4. Repair the impeller and re-do the dynamic and static balance test;

5. Find balance;

 

Fault phenomenon 2

 

The fixing parts of the centrifugal fan cause resonance

Reason:

 

1. The cement foundation is too light or the grouting is poor or the plane size is too small, causing the fan foundation to be out of touch with the foundation, the anchor bolts to be loose, and the base connection to be not firm, so that the foundation rigidity is insufficient;

 

2. The rigidity of the fan base or volute is too low;

 

3. The inlet and outlet pipes connected to the fan are not supported and softly connected;

 

4. The adjacent facilities are too close to the foundation of the fan, or its rigidity is too small;

 

1. Strengthen the foundation or re-grout, tighten the nuts;

Handling method:

 

2. Strengthen its rigidity;

 

3. Add support and soft connection;

 

4. Increase rigidity;

 

Fault phenomenon 3

 

The centrifugal fan bearing is overheated

 

Reason:

 

1. The centrifugal fan main shaft or parts on the main shaft rub against the bearing box;

 

2. The motor shaft and the fan shaft are not concentric, causing the inner rolling bearing in the bearing box to move;

 

3. The bearing box Too much internal grease;

 

4. There is a gap between the bearing and the bearing box hole and it is loose, and the bolts of the bearing box are too tight or too loose;

 

Treatment method:

 

1. Check which part is rubbing and then deal with it;

 

2. Adjust the concentricity of the two shafts;

 

3. The grease in the box is 1/3~1/2 of the box space;

 

4. Adjust the bolts;

 

Fault phenomenon 4

 

Centrifugal fan bearing wear

 

Reason:

 

1. Pit spots, spots, rust marks and peeling appear on the surface of the centrifugal fan rolling bearing ball;

 

2. The gap between the inner circle of the cylindrical bearing and the outer circle of the rolling bearing exceeds 0.1mm;

 

1. Repair or replace;

 

2. The bearing should be replaced or the inner circle of the box should be enlarged and inserted into the inner sleeve;

 

Fault phenomenon 5

 

Centrifugal fan lubrication system failure

 

Reason:

 

1. The gap between the oil pump bearing hole and the gear shaft is too small, and the radial gap between the inner hole of the housing and the gear is too small;

 

2. The gear end face and The gap between the bearing end face and the side cover end face is too small;

 

3. The lubricating oil is of poor quality, the viscosity is not appropriate or there is too much water;

 

Handling method:

 

1. Repair to make the gap reach the required range;

 

2. Adjust the gap;

 

3. Replace the centrifugal fan lubricating oil;

 

Fault phenomenon 6

 

Lower air volume

 

Reason:

 

1. Reduced speed;

 

2. Pipeline blockage;

 

3. Seal leakage;

 

Handling method:

 

1. Check the power supply voltage;

 

2. Clear and clean the pipeline;

 

3. Repair or replace the seal;

 

Fault phenomenon 7

 

Lower wind pressure

 

Reason:

 

1. Excessive system resistance;

 

2. Changes in medium density;

 

3. Impeller deformation or damage;

 

Handling method:

 

1. Correct the system design to make it more reasonable;

 

2. Adjust the imported blades;

 

3. Replace the damaged impeller;

 

Fault phenomenon 8

 

Vibration

 

Reason:

 

1. Foundation 1. Not firm, sinking or deformed;

 

 2. The main shaft is bent and deformed;

 

 3. The outlet valve opening is too small; 

 

4. The centering is not good; 5. The rotor is unbalanced; 6. Pipeline vibration;

 

Solution: 1. Repair and reinforce the foundation; 2. Replace the main shaft; 3. Adjust the valve appropriately; 4. Realign; 5. Balance or replace the rotor; 6. Reinforce the pipeline or adjust the piping;

 

Fault phenomenon 9

 

High bearing temperature

 

Reason: 1. Bearing damage; 2. Incorrect selection of lubricating oil or lubricating grease; 3. The lubricating oil level is too high or lacks oil; 4. Insufficient cooling water; 5. The motor and fan are not on the same center line; 6. Rotor vibration;

 

Solution: 1. Replace the bearing; 2. Reselect and replace the appropriate oil; 3. Adjust the oil level; 4. Increase the amount of cooling water; 5. Find radial and axial levels; 6. Find balance for the rotor.