(1)High temperature resistant centrifugal fanIn place the upper part of the bushing, install positioning pins, connecting bolts and nuts, and tighten the nuts.
(2) Put the upper cover of the bearing box in place, and check the surface contact between the spherical surface of the upper cover of the bearing box and the upper half of the bushing (the method is the same as 5.3) and the interference between the bearing box and the bushing. The interference between the bearing box and the bushing is 0.02-0.04.
(3) After all the above parts are qualified, install the gasket. The sealing gap is 0.2-0.6. The sealing gap is slightly too small, allowing scraping and sealing.
(4) Clean and wipe the inner surface of the bearing box, the horizontal split surface and the surface of the bushing, and pour a certain amount of clean N46 turbine oil between the bushing and the journal.
(5) Put the upper cover of the bearing box in place, install the positioning pin, and connect the nut and bolt of the horizontal middle split surface of the bearing box
(6) In place the upper part of the bushing, install positioning pins, connecting bolts and nuts, and tighten the nuts.
(7) Put the upper cover of the bearing box in place, and check the surface contact between the spherical surface of the upper cover of the bearing box and the upper half of the bushing (the method is the same as 5.3)
(8) After all the above parts are qualified, install the gasket. The sealing gap is 0.2-0.6. The sealing gap is slightly too small, allowing scraping and sealing.
(9) Clean and wipe the inner surface of the bearing box, the horizontal split surface and the surface of the bushing, and pour a certain amount of clean N46 turbine oil between the bushing and the journal.
(10) Put the upper cover of the bearing box in place, install the positioning pin, and connect the nut and bolt of the horizontal middle split surface of the bearing box
6. The installation level of the unit is not good, and the rotor deflection has changed.
7. The alignment error of the coupling center caused by poor installation is too large.
8. The gap between the coupling and the shaft is too large; the gap between the elastic sleeve is too large or the gap is uneven.
9. There is friction in the casing, and the impeller skews and collides with the inner wall of the casing.
10. The gap between the collector and the fan impeller is uneven or there is friction.
11. The bearing is worn and the clearance is too large; the journal is worn, and the clearance between the inner sleeve of the bearing and the journal is large.
12. The conveying medium channel is blocked, rusted, and dirty.
13. On some joint surfaces, in order to prevent rust and reduce the difficulty of disassembly and assembly, some lubricating grease and mechanical oil should be applied.
14. Poor installation of the air inlet duct and outlet duct of the fan.
15. The connecting bolts of various parts are loose.
16. Vibration caused by electrical defects: the three-phase magnetic field of the stator is asymmetrical, and the magnetic center is misaligned due to unbalanced three-phase voltage, single-phase operation, etc.; the stator core or stator coil is loose, which increases the electromagnetic vibration and noise of the stator; Electromagnetic vibration caused by uneven air gap of the motor; rotor conductor failure, loose parts, etc.
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