Cooling tower fan fault analysis and processing

1 a, cooling tower fan structure. Ram 2. 3 leaf. 4 reducer base. Wheel hub 5. Reducer 6, 8. Chain coupling 7. The shaft. Motor 10. 11 motor base. Cooling tower at the top of the second, the failure condition on 24 July 2013 00:20 points or so, the pump operator on duty room heard two loud noise from the cooling tower, immediately to the on-site check, found that the fan current control on display # 2 ( 50) (lower than usual When the normal operation of the current 58 a left and right) Suspected of 2 # fan out of the question, immediately to the cooling tower at the top of the inspection, found that 2 # fan has been shut down, but the motor is still in the rotation, the operator to shut down the 2 # fan control cabinet, immediately and notify the transformer room to cut off the motor power. Maintenance staff rushed to the scene after the fault spot check, found that a fan blade from near the root fracture, fall on the ground of 2 # fan outside the north 25 m, split in cross-sectional alternated uneven, corrosion degree is different, the other 5 blades bent and serious deformation of different level, drive shaft and the motor and fan coupling aluminum alloy cover fragmentation, coupling chain broke off, from nearly reducer reducer gas pipe root fracture, reduction of oil into the large pool, all around the ram is full of scratches, parts were wearing. Three, analysis of the cause of the problem in the fan run from 2004 to now, has been nearly 9 years, every half a year or so, in the process of operation will stop check coupling lubrication and wear situation of chain, according to the condition of wear and tear replacement chain and grease, ever stop to check the fan operation of half a year ago, although there is corrosion, but all important components are running in good condition, and close to the tally is not found abnormal vibration and noise, more smooth rotation. Due to the corrosion of carbon steel in a wet environment is faster, and circulating water to add a treatment agent, in the process of fan operation, treatment with water vapor was taken to the blade on the connecting tube, aggravated the corrosion rate of the connecting tube. Found by observing the failure blade connecting pipe cross-sectional, uneven corrosion degree and thin place less than 2 mm, intensity is greatly reduced, the fan blade was strong during the operation of centrifugal force, the location of the severe corrosion can not withstand the effect of centrifugal force and the first tear, as the fan running, gap widening, blade end contact with ram caused a collision occurs, accelerated the speed of crack fracture during the process of collision, the blade end down, run into the shaft, the huge impact force, under the action of fly again on to the other five blades, make the other five blades produces different degree of deformation, under the action of centrifugal force and inertia fly out at the same time, the fan is still in operation, in this case, the wheel hub was badly damaged by balance and reducer vibration increases sharply, the base vibration increase, eventually result in reducer coupling chain damage, drive shaft and the release speed reducer, gear reducer service, while the motor is still running, current decline due to load decreases. 4, fault processing 1, due to the cooling tower fan speed reducer and the coupling on the motor, chain, wheel hub, leaf damage more serious, the shaft deformation may exist, all need to be replaced, reducer tubing from the root fracture, if repair need time is longer, it will have greater effects on the production, in order to will be reduced to small effect, decide the overall change a backup fan. The spare fan design using the present advanced airfoil, aerodynamic performance is good. Blade made of high strength glass steel, high strength, light weight, corrosion resistance and other advantages. Then remove the damage of fan, while new fan assembled according to requirements of the installation technology, and according to adjust the wind leaf blower factory mark Angle, Angle at about 8 °. After the old fan condole, found that the reducer base corrosion is serious, two pieces of shim thickness uneven, can no longer use, processing the two pieces of mat iron again. Put the pad iron in the base check levelness, found that the base is low, the processing again mat iron leveling, will hang fan integral pedestal, then find the motor and reducer, add lubricating oil driving test at all after the completion of the installation work. 2, the fan to stop, adjust the blade Angle to 15 ℃, the blade Angle adjustment starts again after the completion of commissioning, starts running current is 61 a, fan fan vertical vibration motor base 2. 3 mm/s, motor level 2. 4 mm/s, the vertical one. After 7 mm/s, stable running, circulating water tower temperature is 33. 0 ℃, is still not meet the design temperature. 3, in order to thoroughly solve the problem, decide to replace a originally have repair good old reducer, and the new hanging fan as a whole, the hub is removed, along with the blades due to the speed reducer speed faster, and adjust the Angle of the blades to 12 °, loaded on the repair good reducer, fan as a whole will be loaded on the fan base again, looking for motor and reducer, back to the start after commissioning, fan operation after 3 h, circulating water tower temperature of 31. 5 ℃, meet the design requirements, to meet the production requirements, but at the moment, the vibration of the vibration points is higher, to process again. Fifth, through this fault handling, take corresponding preventive measures to reduce the fault occurred. 1) Strengthen the equipment check, timely grasp the operation condition of the fan, reasonable arrangement of maintenance cycle; 2) Spare parts replacement first to see the technical data, avoid detours; 3) Treatment failure, as far as possible to find the possible cause of the failure, do a comprehensive screening; 4) In strict accordance with the operating rules.

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