That master has a complete set of compressed materials

I. Working principle of the Roots blower: The Roots blower is a positive-displacement blower; the volume of air it transports is proportional to its rotation speed. With each rotation of the three-blade impeller, two impellers carry out 3 suction and exhaust cycles. Compared to the two-leaf type, it has less gas pulsation, less vibration, and lower noise. A slight gap is always maintained between the impellers on the two shafts of the fan and the inner surface of the elliptical shell, as well as between the end faces of the impellers and the front and rear end covers of the fan, and also between the impellers themselves. Driven by the synchronous gears, air is conveyed from the fan’s inlet along the inner wall of the shell to the outlet side. The fan’s internal cavity does not require lubricating oil; it has a simple structure, operates smoothly, offers stable performance, and can be used for various purposes, which has led to its widespread use in many fields. II. Characteristics of the Roots blower: Thanks to the use of a three-blade rotor design as well as a well-structured inlet and outlet in the casing, the blower exhibits low vibration and low noise levels. The impeller and shaft form an integrated structure, and the impeller does not wear out; as a result, the fan’s performance remains constant, allowing it to operate continuously for a long time. The fan features a high volume utilization rate and high volumetric efficiency, as well as a compact structure and flexible installation options. The selection of bearings is reasonable, and the service life of each bearing is consistent, thereby extending the lifespan of the fan! The fan oil seal is made of imported fluororubber material, which is heat-resistant, wear-resistant, and has a long service life. With a wide range of models, it can meet the needs of different users for various purposes. III. Fault analysis and solutions for Roots blowers 1. Friction between impellers (1) Contaminants on the impellers cause an excessively small gap ； (2) Gear wear, resulting in a large side clearance ； (3) The gears are not securely fixed, failing to keep the impeller synchronized ； (4) Bearing wear causes an increase in clearance. (5) Remove dirt and check for any damage to the internal components ； (6) Adjust the gear clearance; if the gear side play is 30%～50% higher than the average value, the gear should be replaced ； (7) Reassemble the gears to maintain a taper fit with a contact area of 75% ； (8) Replace the bearing ； 2. The installation clearance between the impeller and the wall panel, as well as between the top of the impeller and the casing (1), is incorrect ； (2) 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) The bearing has poor axial positioning. (6) Readjust the gap ； (7) Identify the cause of overloading and reduce the pressure to the specified value ； (8) Check the installation accuracy to reduce pipeline tension ； (9) Inspect and repair the bearings, and ensure the proper clearance. 3. Excessively high temperature: (1) Too much oil in the tank, oil that is too thick, or oil that is heavily contaminated ； (2) Clogged filter or silencer ； (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. (7) Lower oil level or carry oil ； (8) Remove blockages ； (9) Reduce the pressure difference across the blower ； (10) Repair gap ； (11) Install ventilation openings to lower room temperature ； (12) Increase the speed to prevent the belt from slipping. 4. Insufficient flow (1) Clogged inlet filter ； (2) Impeller wear, with excessive increase in clearance ； (3) Belt slippage ； (4) High inlet pressure loss ； (5) Pipelines cause ventilation leaks. (6) Remove dust and blockages from the filter ； (7) Repair gap ； (8) Tighten the belt and increase the number of strands ； (9) Adjust the inlet pressure to the specified value ； (10) Inspect and repair the pipes. 5. Oil leakage or oil seeping into the casing: (1) The oil level is too high, causing oil to leak out through the drain port ； (2) Seal wear, resulting in oil leakage at the shaft end ； (3) Pressure is higher than the specified value ； (4) The ventilation openings of the wall panels and fuel tank were blocked, causing oil to leak into the casing. (5) Lower oil level ； (6) Replace the seal ； (7) Clear the ventilation openings; install a plug with a 2mm aperture in the middle chamber, and open the plug under the wall panel ； 6. Stop the machine immediately in case of abnormal vibration and noise: (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) Collisions between impellers and between the 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 accumulation or foreign objects ； (7) The anchor bolts and other fasteners are loose. (8) Replace the bearing or bearing housing ； (9) Reinstall the gear and ensure proper side clearance ； (10) Clean the blower and check whether the casing is damaged ； (11) Check the back pressure, verify that the impeller is aligned, and adjust the clearance properly ； (12) Check the filter and back pressure, and increase the clearance between the impeller and the inlet of the casing ； (13) Clean the impeller and casing to ensure the proper working clearance of the impeller ； (14) Tighten the foot bolts and level the base. 7 Motor overload (1): The pressure difference is large compared to the specified pressure; in other words, the back pressure or inlet pressure is too high ； (2) Compared to the flow rate required by the equipment, the fan’s flow rate is too high, resulting in increased pressure ； (3) Clogged inlet filter, obstruction or blockage in the outlet pipeline ； (4) Collision and friction (sticking) of rotating components ； (5) Oil level too high ； (6) The narrow V-belt is overheating, there is excessive vibration, and the pulley is too small. (7) Reduce the pressure to the specified value ； (8) Release excess gas into the atmosphere or reduce the blower speed ； (9) Remove obstacles ； (10) Shut down immediately and check the cause ； (11) Adjust the oil level to the correct position ； (12) Check the belt tension and replace it with a pulley of larger diameter.