Centrifugal blower installation, maintenance, and use instructions

2022-07-16 10:01
1. Installation of blower
 1. The blower should be carefully checked before installation:
     ①The impeller and chassis are damaged or deformed due to transportation, otherwise they should be repaired before they can be installed.;
 ②The front disc of the impeller and the collector have collided due to loose coupling bolts or deformation of the front disc collector. If the gap between the front disc and the collector is uneven, it should be adjusted before installation.;
 ③Whether the connection of each component is fastened;
 ④Is the insulation performance of the motor good?;
 2. The blower can be installed on the ground, suspended and hoisted. When installing the blower outdoors, the rainproof measures of the motor must be considered. 
 ①when the blower is installed on the ground, the foot bolts should be embedded in the foundation when watering the foundation. During installation, the blower is hoisted to the foundation and the foot bolts are aligned, and the foot bolts are fastened after correction and leveling. Shock absorbers can also be placed at the foot of the blower to isolate vibration, and the shock absorber and the ground foundation do not need to be fastened with foot bolts. 
 ② When the blower is suspended and hoisted, the mounting bracket is bolted to the embedded parts of the floor, and the blower is hoisted to the mounting bracket. After the correction and leveling, the blower feet and the mounting bracket are bolted to fasten them. For damping and noise reduction, damping hooks can be set. 
 3. When installing the blower, ensure that the direction of air flow is consistent with the direction of air flow on the shell. 
 4. When installing centrifugal ducted blowers, the blower must be supported by a mounting bracket. It must be installed according to the installation orientation sign affixed to the shell. It must not be installed upside down or sideways, otherwise it will affect the service life of the motor. 
 5. When the inlet and outlet of the blower need to be connected to the duct, the soft joint transition connection shall be applied, and the weight of the pipe shall not be allowed to be added to the blower components. 
 6. When installing the blower, you must take it lightly and avoid rough installation. After the blower is installed, the impeller must be toggled to check whether the impeller is rotating correctly and whether there is any collision between the impeller and the collector. If something is found to be wrong, it must be adjusted. 
 2. Commissioning, operation, and maintenance of the blower
 1. Start of the blower:
 The blower should be carefully inspected before starting. The contents of the inspection are:
①The insulation performance of the motor is good, and the motor wiring is correct and firm. The motor pinout must be pressed
 The wiring diagram in the junction box is wired, and any wrong connection method will cause the motor to burn down instantly or in a short time after it is powered on. 
 ②Check whether the lubrication of the bearing is intact, and the blower bearing must be in good lubrication condition before it can be started. 
 ③Rotate the impeller of the blower a few times to check whether the impeller is stuck and rubbed. If so, it must be adjusted. 
 ④Check whether there are debris in the blower housing and near the belt cover that hinder the rotation. If so, all should be removed. 
 ⑤Whether the foot bolts of the blower are loose. It is necessary to ensure that the foot bolts are firm, otherwise it will cause strong vibration of the blower. 
 ⑥Whether the blower impeller is reversed or not, if it is reversed, the impeller must be completely stopped before it can be started again. The direction of the air flow of the blower must be consistent with the direction of the air flow on the housing. 
 ⑦Check whether the valve at the inlet or outlet of the blower is closed. The blower should be avoided from starting with load. The valve at the inlet or outlet of the blower should be opened gradually after the blower has reached the fixed speed after starting, and then adjusted to the desired position. It is strictly forbidden to rotate without resistance. 
 ⑧In order to extend the life of the motor, the high-power motor should be started with a step-down voltage. 
 2. Normal operation and maintenance of the blower:
 ①The normal operation of the blower is mainly to monitor the current of the blower, and over-current operation is strictly prohibited. 
 ② Always check whether the blower bearing is normal and whether there is friction, collision sound, etc. 
 ③Always pay attention to the loosening of the connecting bolts in all parts of the blower, pay attention to the abnormal sound made by the motor and blower, and find problems and deal with them in time. 
 ④Regularly remove dust, dirt and other debris from the inside of the blower, and prevent corrosion. 
⑤Under normal circumstances, the bearing is greased with grease every 800 hours of operation of the blower, and the motor and blower are thoroughly inspected at least once every 2500 hours of operation of the blower (about half a year). If the bearing grease is found to have deteriorated, it must be replaced in time. Before replacement, the bearing must be cleaned with gasoline. The grease adopts lithium-based grease, and the amount of grease added is appropriate for two-thirds of the volume of the bearing clean room (one-half of the two-pole motor is appropriate). 
 ⑥In normal operation, if the following conditions are encountered, it should be stopped immediately for inspection or repair:
 A. The bearing temperature exceeds 80℃ or the bearing is smoking. 
 B. The temperature rise of the motor exceeds 70℃ or the motor is smoking. 
 C. There is a strong vibration or a loud rubbing sound. 
 If you stop for inspection, cut off the motor power supply and mark it to avoid accidents.

3. Common fan failures, causes of failures and maintenance methods
 Cause of failure
 Maintenance method
 1. The rivets, blades and impellers are loose. 
 2. Corrosion or wear of the blade surface or rivet head. 
 3. The skew of the impeller is too large after deformation, causing the radial and axial beating of the impeller to be too large. 
 1. Fasten the rivets or replace the rivets. 
 2. If the system is individually damaged, replace individual parts. If the system is semi-damaged, replace the impeller. 
 3. After removing the impeller, use a hammer to correct or adjust the position of the tie rod in the impeller. 
 1. The positions of the two pulleys are not corrected, the center lines of the two pulleys are not parallel, or the two ends of the pulleys are not flush. 
 2. The distance between the two pulleys is close or the belt is too long. 
 1. Re-align the pulleys so that the centerlines of the two pulleys are parallel and the two ends are flush. 
 2. Adjust the tightness of the belt, adjust the spacing between the two pulleys, or replace the appropriate belt. 
 1. When the impeller rotates, it touches the current collector. 
 2. The fan hoarding rubs against the main shaft. 
 3. Damage to the dynamic balance of the impeller:
 ①The middle wheel is deformed by pressure during installation or storage and transportation. 
 ②the weight of the blade is asymmetrical, or part of the blade on one side is corroded or part of the wear is serious. 
 ③Uneven attachments are attached to the leaves, such as rust, ash, oil, etc. 
 ④The balance block falls off, or the balance is not balanced after maintenance. 
 4. Poor installation of the shaft:
 The pulley is not installed correctly, and the two pulley axles are not parallel
 5. The fixed part of the rotor is loose:
 ①the connection between the impeller and the shaft is loose. 
 ②the connection between the impeller, pulley and shaft is loose or the front nut of the impeller is loose. 
 ③The axial fixation of the rolling bearing is loose. 
 6. The grouting of the foundation is poor, the bolts of the fan feet are loose, and the connection of the base is not firm; the motor fixing bolts are loose. 
7. The stiffness of the foundation is not enough or firm, which causes the imbalance of the rotor and causes severe resonance. 
 8. The bearing is damaged; the grease is inferior or deteriorated. 
 9. The flow rate of the fan is too small, and the fan is working in an unstable area, and a “surge” occurs, causing strong vibration. 
 1. The impeller or collector is deformed, and the gap between the impeller and the collector is corrected. 
 2. Adjust the shaft hole of the hoard to be concentric with the center of the spindle. 
 ① Correct the impeller. 
 ② Replace the broken blade, or replace the new impeller, and do a good job of balance. 
 ③Remove attachments from the leaves. 
 ④ Re-balance and fix the balance block firmly. 
 Make adjustments and rectify them. 
 ① Tighten the nuts or rivets. 
 ②Repair the shaft and impeller, reassemble the keys, and tighten the round nut. 
 调整Adjust well. 
 6. Carry out appropriate repairs and reinforcement, tighten the nuts, fill the gaps, and tighten the motor fixing bolts. 
 7. Carry out appropriate repairs and reinforcement to fill the gaps. 
 8. Replace bearings or grease. 
 9. Set up a vent valve in the exhaust pipe of the fan. 
 Take the table above
  Fourth, electricity
 After running at room temperature for one hour, if the motor temperature rise is found to be too high, it may be caused by one of the following reasons:
 1. The motor bearing is damaged or the grease is inferior or deteriorated. 
 2. The tolerances of the installation of motor shafts, fan bushings, pulleys, etc. do not meet the technical requirements. 
 3. The resistance of the system is too large, the motor is overloaded, the fan selection is unreasonable, or the valve of the pipeline system is opened too much. 
 4. The power supply voltage is too low. 
 5. The motor is running out of phase. 
 1. Replace bearings or grease. 
 2. Reformulate to meet the prescribed requirements. 
 3. If the optional configuration is unreasonable, replace the fan, and if the valve is opened too large, close the small valve. 
 4. Ensure that the fan power supply voltage meets the standard requirements. 
 5. Check whether the motor wiring is loose, etc. 
 1. The shaft shell vibrates violently. 
 2. The quality of the grease is poor or deteriorated. 
 3. The installation of the shaft and rolling bearings is skewed, and the front and rear bearings are not centered. 
 4. The rolling bearing is damaged. 
 1. Eliminate vibration. 
 2. Replace the grease. 
 3. Adjust the two bearings to concentric. 
 4. Replace the bearing. 
 1. The fan rotates in the opposite direction. 
 2. The air temperature is too low or the gas contains impurities, which increases the air density. 
 3. The air inlet pipe or air outlet pipe is blocked or the valve is not opened. 
 4. The air outlet pipe is broken or the flange leaks. 
 5. The blades are severely worn out. 
 6. The spindle and impeller are loose. 
 7. The belt is loose and slippery. 
 8. Improper selection of fan type. 
 1. Change the steering and change the motor power connection method. 
 2. Increase the air temperature and reduce the air density and viscosity. 
 3. Open the valve to remove the blockage. 
 4. Repair pipes and tighten flanges. 
 5. Overhaul the blades or replace the impellers. 
 6. Overhaul and tighten the impeller. 
 7. Adjust the belt tightness. 
 8. Reselect the fan or increase the fan speed to increase the motor power. 
  Seven, noise
 1. Severe vibration. 
 2. No sound insulation facilities. 
 3. The installation of pipes and control valves is loose. 
 4. There is no soft joint transition between the inlet and outlet flanges of the fan and the pipe connection. 
 5. The fan works in the surge zone. 
 1. Operate according to the third “vibration” of the common faults above. 
 2. Add sound insulation facilities. 
 3. Fasten and install. 
 4. Increase the transition connection of the soft joint. 
 5. Set up a vent valve in the exhaust pipe of the fan.


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