Centrifugal Exhaust Blower , Quiet Centrifugal Fan For Painting Industry

Centrifugal exhaust blower cooling blade motor direct cold rolled steel plate quiet centrifugal fan painting industry.

Vibration caused by rotor mass imbalance.

1.In the field of fan bearing vibration, the vibration belonging to the rotor mass imbalance accounted for the majority. In daily maintenance, we found that the main reasons for the unbalanced quality of the rotor are:

•  there are uneven ash accumulation or attachment on the surface of the blade, impeller backplate accumulation;
•  the impeller did not find the balance after maintenance, resulting in the impeller imbalance;
• the parts on the impeller are loose or the connecting parts are not tight;
• Wear or corrosion of impeller.

The characteristics of vibration caused by rotor imbalance mainly include the following:

① the vibration value is the largest in the horizontal direction, and the axial direction is very small, and the vibration value of the impeller end bearing is greater than that of the motor end bearing;

② The vibration stability is good, and it is not sensitive to load changes;

③ The amplitude increased with the number of revolutions.

2. Vibration caused by abnormal rolling bearing

2.1 Vibration of poor bearing assembly If the shaft neck or shoulder is poorly processed, the shaft neck is bent, the bearing is installed tilted, and the bearing inner ring is assembled, resulting in a mismatch with the axis line, which causes an alternating axial force to occur every turn of the bearing, and the fixed nut of the rolling bearing is loose, resulting in local vibration. The vibration characteristics are as follows: the vibration value is the largest in the axial direction.

2.2 damage to the surface of the rolling bearing vibration rolling bearings due to the manufacturing quality is poor, poor lubrication, foreign bodies, into, the clearance between the bearing box and substandard, etc., will be wear, corrosion, peeling after spalling damage, fracture, collisions and produce high-frequency vibration of the roller will be passed on to the bearing seat, by vibration is measured and the vibration value of the bearing. This kind of vibration stability is very poor, independent of the load, the amplitude of vibration in the horizontal, vertical and axial three directions may be the largest, vibration precision diagnosis with the help of spectral analysis, the use of spectral analysis can accurately determine the accurate position and damage degree of bearing damage. Vibration is the most common phenomenon, grasping vibration monitoring can judge the vast majority of faults, coupled with the monitoring of sound, temperature and wear metal, all defects of rolling bearings can be detected in the early stage.

3. Vibration caused by insufficient stiffness of bearing pedestal foundation

Poor dynamic foundation grouting, loose anchor bolts, loose gaskets, corrosion and cracking of the frame and weak connection will cause severe forced resonance phenomenon. The characteristics of this vibration: the frame vibration at the problematic anchor bolt is the largest, and the radial component is the largest.

4. Vibration caused by abnormal coupling

The installation of the coupling is not correct, the elastic ring of the coupling is damaged, and the concentricity of the fan and the motor shaft is poor, which will cause the fan and motor vibration. The vibration characteristics are as follows:

① the vibration is uncertain, the vibration changes sharply with the load, the idling is light, the full load is large, the vibration stability is good;

② The larger the axis deviation, the greater the vibration;

③ The motor runs alone, and the vibration disappears.

5. Vibration caused by friction between dynamic and static parts

Such as impeller mouth ring and shell mouth ring friction, spindle and sealing device friction. Its vibration characteristics: vibration instability; Vibration is self-excited vibration independent of speed; When the friction is severe, reverse vortex will occur

 
Key Features 

• Impeller diameter: 90~3500 mm 
• Speed of mainshaft: 560~2900 rpm
• Pressure range: 3000~25425 Pa
• Flow range: 1297~83305 m3/h
• Air Temperature: 20~1000 Celsius degree

• Material: Cast Iron, Carbon Steel, Stainless Steel.

• Efficiency: 80%-90%

Please advise us the USAGE and following Parameter.Our engineering Dept will recommend the most suitable product for you.