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Finding the cause from the outside is unsuccessful. The root cause of the fault must be excavated from the inside: the main shaft is bent; the rotor is unbalanced. The spindle is worn and can be replaced with a new one, so a dynamic balance test must be performed.
Dynamic balance test We assembled the new shaft with the hub and the blade and transported it to the Jiamusi Fan Factory for dynamic balance test.
The test proves that the rotor is unbalanced and balanced by adding a weight. A total of three times is added, and the weight is added inside the hub without affecting the fluid motion characteristics. The last remaining unbalance is the level of 121320gmm, the grade of 51652gmm, according to the ZBJ72042) 90 standard, the corrected residual unbalance is less than 891000gmm after correction.
Fault analysis (1) From the results of the dynamic balance test, it can be seen that the mass added by the two-stage impeller is not on the same side, and is basically symmetrical. The center line of the impeller has an angle with the axis. After the fan runs smoothly, the center of mass line will Automatically adjust to the center of rotation, and extrude the axis, so that the axis twists and rotates on the double cone surface, generating the same frequency vibration equal to the number of revolutions of the motor.
(2) The main shaft and the transition are matched. Although the precision is high, the interference is very small. When the fan is under heavy load, the journal is subject to the pulsating radial load of the bearing reaction and the axial force of the wind flowing through the impeller to the impeller. At the same time, it must withstand the same-frequency vibration caused by the centroid shift, which deteriorates the working condition of the journal mating surface. Under the impact of these dynamic loads, the metallographic structure will have a tendency to slip and deform, and the two ends of the spindle will be adjusted. Although the heart bearing can compensate the axial deflection of 23b, the amplitude of the vibration is increased due to the existence of the gap, so that the journal wear can be maintained and developed. When the fatigue limit of the journal exceeds the fatigue limit of the journal, the journal will appear. Permanent deformation, relative motion with the bearing and increased wear.
(3) Since the bearing part 1 is better than the bearing 2, in addition to the radial bearing, the compression ring can overcome a certain radial force, so the wear is weaker at the weaker journal 2 As a result, the amount of runout of the impeller at the bearing 2 is increased, causing a failure of the blade to hit the casing.
Moreover, the structure of the bearing portion 2 is not easy to inspect, which brings certain difficulties to the inspection work.
(4) The 3619 bearing overrun and the elastic rubber ring in the couplings 7, 8 are damaged because the radial runout is increased after the journal wears, and the vibration is transmitted to the couplings 7, 8 and the bearing and the apron are Compensation for damage during vibration.
Solution (1) Remove the 210mm pad under the bearing housing 2; take a thin steel wire based on the bearings 1, 2 to find the positive bearings 3, 4, 5 to meet the requirements. (2) Replace worn parts.
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