Causes of NSRH Roots blower gears not turning

Causes of Roots blower gears not turning and operating conditions during use.

1. Regular Inspections: Conduct frequent inspections to check the operational sounds, vibrations, temperature, and lubrication conditions of the blower. Promptly address any issues found and report them to the shift supervisor.

2. Oil Station Inspection: Thoroughly examine the working conditions of the oil station, including oil temperature in the tank, oil level, oil pump pressure, post-filter pressure, oil temperature after the cooler, suction pressure, and oil quality.

3. Lubrication Point and High-Level Oil Tank Inspection: Verify the oil return conditions at lubrication points and the high-level oil tank.

4. Water Pressure Control: Ensure that the water pressure in the oil cooler is lower than the oil pressure to prevent oil-water emulsification caused by water entering the oil, which could lead to blower failure.

5. Pipeline Cleaning and Valve Positioning: Remove welding slag and other foreign objects from the pipeline before installation. Keep valves fully open to prevent overloading and damage to the blower.

6. Gear Oil Inspection and Refilling: The oil tank is pre-filled with gear oil upon delivery. Check and refill gear oil as needed. During shutdown, refill to the middle of the oil sight glass; avoid overfilling to prevent oil leaks.

7. Narrow V-Belt Tension and Pulley Alignment: Check the tension of the narrow V-belts and the alignment of the pulleys. Pulley misalignment can be corrected using a straightedge. Belts may loosen over time and require readjustment.

Causes of Gear Non-Rotation in Roots Blowers:

（一）Bearing Damage:

Bearing failure can also cause gear immobility. Bearings are crucial components of Roots blowers, with four bearings located at each end of the impeller shaft. Damage to these bearings can either jam the impeller or cause incorrect gear meshing, leading to gear immobilization.

（二）Rotor Shaft Damage:

The rotor shaft, a part of the impeller and a horizontal shaft running through it, can affect impeller and, consequently, gear rotation if worn or deformed. Rotor shafts may be integrally formed or assembled.

（三）Improper Gear Meshing:

During gear installation, specific clearance tolerances must be adhered to. If the meshing clearance is too small, the gears will not rotate. Roots blowers have multiple assembly clearance standards that must be adjusted according to design specifications.

（四）Misaligned Locating Holes:

After major overhauls involving impeller or shaft replacement, inaccurate gear sleeve positioning may occur. This requires redesigning the locating holes based on the gear. Installing gears with misaligned holes can result in gear immobilization.

（五）Impeller Seizure:

Damage to the Roots blower's impeller, located in a separate chamber from the gearbox, can cause gear failure. This damage may originate from within the gearbox or the impeller itself. Failing to inspect the impeller before gear installation can lead to gear immobilization due to underlying impeller issues.

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