Methods for dealing with oil leakage in Roots blowers

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Before addressing the issue, it is necessary to know the reasons for oil leakage in the Roots blower. The methods for dealing with oil leakage vary depending on the cause: 1. Friction between the impellers of the Roots blower – (1) Contaminants on the impellers result in too small a gap; (2) Gear wear leads to an excessive side clearance ； (3) The gears are not securely fixed, failing to keep the impeller synchronized ； (4) Bearing wear causes an increase in clearance. Treatment method: (1) Remove dirt and check whether the internal components are damaged ； (2) Adjusting gear clearance: If the gear side clearance is 30%~50% higher than the average value, the gear should be replaced ； (3) Reassemble the gears to maintain a taper fit with a contact area of 75% ； (4) Replace the bearing ； 2 Impeller and wall panel, top of impeller and casing ； II. (1) Incorrect installation clearance ； (2) The operating pressure is too high, exceeding the specified value ； (3) Excessively high operating temperature ； (4) Deformation of the casing or base, resulting in failure of the fan’s positioning ； (5) Poor axial positioning of the bearing. Solution: (1) Readjust the gap ； (2) Identify the cause of the overload and reduce the pressure to the specified value ； (3) Check the installation accuracy to reduce pipeline tension ； (4) Inspect and repair the bearings, and ensure the proper clearance. III. Excessively high temperature of the Roots blower: (1) Too much oil in the tank, oil that is too thick, or oil that is heavily contaminated ； (2) Filter or *clogged ； (3) Pressure is higher than the specified value ； (4) Excessive wear of the impeller, large clearance ； (5) Poor ventilation and high indoor temperatures result in high inlet temperatures ； (6) The operating speed is too low, causing the belt to slip. Treatment method: (1) Lower the oil level or remove oil ； (2) Remove blockages ； (3) Reduce the pressure difference across the blower ； (4) Repair gap ； (5) Install ventilation openings to lower room temperature ； (6) Increase the speed to prevent the belt from slipping. IV. Insufficient flow rate of the Roots blower (1) Clogged inlet filter ； (2) Impeller wear, with excessive increase in clearance ； (3) Belt slipping ； (4) High inlet pressure loss ； (5) Pipes cause ventilation leaks. Solution: (1) Remove dust and blockages from the filter; (2) Repair the gaps ； (3) Tighten the belt and increase the number of strands ； (4) Adjust the inlet pressure to the specified value ； (5) Inspect and repair the pipes. V. Oil leakage from the Roots blower or oil seeping into the casing: (1) The oil level is too high, causing oil to leak out through the oil discharge port ； (2) Sealing wear, resulting in oil leakage at the shaft end ； (3) Pressure is higher than the specified value ； (4) The vents on the wall panels and fuel tank are blocked, causing oil to leak into the casing. Solution: (1) Lower the oil level ； (2) Replace the seal ； (3) Unclog the vents; install a plug with a 2mm aperture in the intermediate chamber, and open the plug beneath the wall panel ； VI. Immediate shutdown in case of abnormal vibration and noise in the Roots blower: (1) The clearance of the rolling bearings exceeds the specified value, or the bearing housings are worn ； (2) Excessive gear clearance, misalignment, and loose fixation ； (3) Impact between impellers and between impellers and the casing caused by foreign objects and dust ； (4) Impeller collision caused by overload and shaft deformation ； (5) Friction between the impeller and the inlet of the casing caused by overheating ； (6) The impeller loses balance due to scale or foreign objects ； (7) The anchor bolts and other fasteners are loose. Solution: (1) Replace the bearing or bearing housing ； (2) Reinstall the gear and ensure proper side clearance ； (3) Clean the blower and check whether the casing is damaged ； (4) Check the back pressure, verify whether the impeller is aligned, and adjust the clearance accordingly ； (5) Check the filter and back pressure, and increase the clearance between the impeller and the inlet of the casing ； (6) Clean the impeller and casing to ensure the proper working clearance of the impeller ； (7) Tighten the foot bolts and level the base. VII. Overload of the Roots blower motor (1) A large pressure difference compared to the specified value, that is, a high backpressure or inlet pressure ； (2) Compared to the flow rate required by the equipment, the fan’s flow rate is too high, resulting in increased pressure ； (3) Clogging of the inlet filter, obstruction or blockage in the outlet pipeline ； (4) Collision and friction of rotating components (sticking) ； (5) Oil level too high ； (6) The narrow V-belt is overheating, vibration is excessive, and the pulley is too small. Treatment method: (1) Reduce the pressure to the specified value ； (2) Release the excess gas into the atmosphere or reduce the blower speed ； (3) Remove obstacles ； (4) Stop the machine immediately and check the cause ； (5) Adjust the oil level to the correct position ； (6) Check the belt tension and replace it with a pulley of larger diameter ；