Roots vacuum pump maintenance and troubleshooting

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Roots vacuum pump maintenance and common fault causes and their elimination methods 1. Maintenance 1. daily inspection: (1), oil level inspection: Excessive oil level will increase the temperature, and too low oil level will cause poor lubrication. (2), temperature check: Check the temperature of various parts with a thermometer. (3), Motor load inspection: Use a power meter or current or voltmeter to measure the motor load. 2． monthly inspection: Tension of coupling elastomer or triangle tape. 3． Quarterly inspection ； Whether the lubricating oil in the gear box has deteriorated. 4． Check every six months: (1) Whether the lubricating oil in the front cover bearing box has deteriorated. (2) Whether the seal is damaged. 5. Check every year: (1) Whether the bearing is worn. (2) Whether the piston ring and piston ring bushing are worn. (3) Whether the slight wear of the gear affects the normal operation of the rotor and whether it needs adjustment. 2. Causes of faults and their elimination methods Causes and elimination methods The ultimate pressure cannot be reached 1. Air leakage in pipelines and systems 2. Partial air leakage in the pump 3. Lowering of the limit pressure of the backing pump 4. The lubricating oil is too dirty or the brand is wrong 5. Oil seal wear 1. Check the system for leaks 2. Check the pump for leaks 3. Repair or replace the backing pump 4. Replace the lubricating oil 5. Replace the oil seal Insufficient pumping speed 1. Insufficient pipeline channel capacity 2. Decreased pumping speed of the backing pump 1. Increase pipeline channel capacity 2. Repair or replace the backing pump motor overload 1. The inlet pressure is too high 2. The rotor end face is in single-sided contact with the end cover 3. The backing pump returns oil into the Roots vacuum pump chamber 1. Adjust and control the inlet pressure 2. Adjust the rotor end face clearance 3. Install the anti-oil return equipment overheating 1. The selected backing pump pumping speed is not enough, causing the compression ratio to be too large 2. The inlet pressure is too high 3. Poor cooling 4. Too much lubricating oil in the gearbox 5. The rotor is in contact with the pump shell 6. Poor lubrication of gears, bearings and oil seals 1. Re-select the backing pump 2. Adjust and control the inlet pressure 3. Unblock and increase the cooling water 4. Adjust the oil volume 5. Trim 6. Ensure the oil volume is appropriate and the lubrication is good. Abnormal sound 1. Poor assembly 2. The position of the guide gear and the rotor is offset, causing the rotor to collide 3 .Inlet pressure is too high 4. Damage to gear caused by overload or poor lubrication 5. Bearing wear 1. Reinstall 2. Adjust position and ensure clearance 3. Adjust and control inlet pressure 4. Replace gear 5. Replace bearing Bearing, early gear wear is serious 1. Poor lubricating oil 2. Insufficient lubricating oil 1. Replace lubricating oil 2. Replenish lubricating oil