The common faults during the operation of Roots blower are as follows:
mechanical failure
-Wear or damage to the impeller**
-Reason: The clearance between impellers and between impellers and the casing is too small, resulting in friction during long-term operation; The conveying medium contains impurities and particles, which cause erosion and wear on the impeller; Improper selection of impeller material or manufacturing quality issues result in insufficient impeller strength.
-Performance: The air volume and pressure of the fan decrease, the noise increases, and in severe cases, vibration intensifies.
-* * Bearing damage**
-* * Reason * *: Poor lubrication of bearings, such as insufficient lubricating oil, oil pollution, unsuitable oil grade, etc; Long term operation and fatigue wear of bearings; Excessive vibration of the fan generates additional impact force on the bearings; Insufficient installation accuracy leads to abnormal load on the bearings.
-Performance: The bearing area heats up, the temperature rises, accompanied by abnormal noise, and in severe cases, it can cause the fan to shut down.
-Gear wear**
-Reason: Insufficient gear meshing accuracy, long-term operation leads to increased wear and tear; Poor lubrication of gears, lack of sufficient lubricating oil or poor oil quality; The excessive load on the fan causes the torque borne by the gears to exceed their carrying capacity.
-* * Performance * *: There is abnormal gear meshing noise during the operation of the fan, and fluctuations in air volume and pressure may affect the normal transmission of the fan in severe cases.
seal failure
-Shaft seal leakage**
-Reason: Improper installation of the shaft seal device, resulting in excessive clearance between the seal and the shaft; Long term use of seals leads to wear and aging; The surface wear and scratches of the shaft affect the sealing effect; The temperature and pressure changes of the conveying medium lead to a decrease in the performance of the seal.
-Performance: There is a medium leakage from the shaft seal, which may be accompanied by oil leakage, affecting the normal operation and working environment of the fan.
-Sealing leakage of the casing**
-* * Reason * *: Loose bolts at the connection parts of the casing, resulting in loose sealing surfaces; The sealing gasket is damaged or aged, losing its sealing function; The casing may leak due to casting defects or long-term operation causing cracks.
-Performance: There may be gas or medium leakage at the joint surface or crack of the casing, and a leakage sound may be heard, which can seriously affect the performance of the fan.
Performance malfunction
-Insufficient air volume**
-Reason: There is a leak in the pipeline system, and some gas has not been discharged through the fan; The gap between the fan impeller and the casing is too large, causing gas reflux; The imported filter is clogged and the air intake is not smooth; The fan speed is too low and has not reached the rated speed.
-Performance: The actual air volume is lower than the design air volume and cannot meet the process requirements.
-Insufficient wind pressure**
-Reason: The system resistance is less than the design value, and the gas flow rate is too high, resulting in a decrease in wind pressure; Wear or damage to the impeller, which affects the boosting ability of the fan; A belt driven fan, when the belt slips, reduces the fan speed, which in turn affects the air pressure.
-Performance: The outlet pressure of the fan does not reach the specified value, making it difficult to overcome system resistance and affecting gas delivery.
electrical fault
-Motor overload**
-Reason: The actual load of the fan exceeds the rated power of the motor, such as increased system resistance, impeller jamming, etc; The power supply voltage of the motor is too low or too high, which affects the output power of the motor; Short circuit and grounding faults in the motor winding result in an increase in motor current.
-Performance: The motor heats up severely and the current exceeds the rated value, which may trigger the overload protection device and shut down the motor.
-The motor cannot start**
-* * Reason * *: Power failure, such as power outage, blown fuse, damaged switch, etc; Motor winding burnt or short circuited; Control circuit faults, such as relay failures, contactor failure to engage, etc; The mechanical part of the motor is stuck and unable to rotate.
-Performance: After pressing the start button, the motor does not respond and cannot start and operate normally.
