**Detailed explanation of the entire maintenance process of Roots blower**
**(Key parameters, disassembly steps, and precautions attached)**
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**1、 Preparation before maintenance**
1. * * Measures**
-Power off and lock (LOTO), release pipeline pressure, and hang warning signs.
-Wear protective equipment (gloves, goggles).
2. * * Tools and consumables**
-* * Essential tools * *: hydraulic wheel puller, torque wrench, dial gauge, plug gauge, copper rod.
-Consumables: sealant (temperature resistant to 200 ℃+), molybdenum disulfide grease, cleaning agent (no residue).
3. * * Fault diagnosis**
-Record abnormal phenomena (such as abnormal noise, vibration, and temperature rise).
-Measure key parameters (current, pressure, vibration values).
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**2、 Disassembly steps**
1. * * Remove external attachments**
-Disconnect the coupling/pulley and mark the alignment position.
-Remove the flange bolts of the import and export, and move the pipeline away.
2. * * Separate gearbox**
-Remove the bolts from the gearbox cover and check the gear mesh markings (if there are no markings, they need to be marked).
-Use a puller to pull out the gear (protect the shaft end thread).
3. * * Lift off the casing**
-Remove the split bolts and use a top screw to open the upper and lower casings.
-Lift the upper casing (to avoid damaging the sealing surface).
4. * * Remove the impeller assembly**
-Remove the bearing seat bolts and gently tap the shaft end with a copper rod to remove the impeller (two people working together).
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**3、 Key component inspection and maintenance**
|* * Components * * | * * Inspection Standards * * | * * Maintenance Methods * *|
|----------------|------------------------------|------------------------------------------|
|* * Impeller * * | Radial clearance ≤ 0.3mm, wear ≤ 1mm | Welding repair (EDCrMo electrode) or replacement|
|* * Gear * * | Tooth surface pitting<5, side clearance 0.1~0.15mm | Pitting polishing or paired replacement|
|* * Bearing * * | Clearance ≤ 0.05mm, no peeling | Heating disassembly (≤ 120 ℃), cold installation of new bearing|
|* * Sealing * * | No hardening or cracking | Replace the skeleton oil seal/mechanical seal (install with lubricating grease)|
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**4、 Assembly and Adjustment**
1. Adjustment of impeller clearance**
-Radial clearance: Measure with a feeler gauge (standard 0.15~0.25mm) and adjust through the bearing seat gasket.
-Axial clearance: dial gauge (standard 0.10~0.20mm), adjust the locking nut.
2. * * Gear meshing calibration**
-Align the gears according to the markings, with a tooth backlash of 0.10~0.15mm (verified by wire indentation method).
3. * * Sealed installation**
-Apply a small amount of lubricating grease to the sealing surface to avoid flipping or twisting.
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**5、 Debugging and acceptance**
1. * * No load test (30 minutes)**
-Tap to confirm correct steering.
-Check:
-Current fluctuation ≤ ± 5 rated value.
-Bearing temperature ≤ 75 ℃.
-Vibration value ≤ 4.5 mm/s (ISO 10816).
2. * * Load operation (2 hours)**
-Gradually increase the pressure to the working pressure and verify:
-The air volume deviation is less than ± 3 (compared to the nameplate).
-No abnormal noise/leakage.
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**6、 Common Fault Handling Table**
|* * Fault phenomenon * * | * * Possible cause * * | * * Solution * *|
|------------------|---------------------|----------------------------------|
|Insufficient air volume | Excessive impeller clearance | Adjust to 0.2mm or replace impeller|
|Vibration exceeding standard | Bearing damage/poor alignment | Bearing replacement+laser alignment (error ≤ 0.05mm)|
|Gear abnormal noise | Gear surface wear or insufficient lubrication | Gear replacement+grease replenishment (ISO VG220)|
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**7、 Precautions after maintenance**
1. * * First run * *: Replace the gear oil after 50 hours (remove running in debris).
2. * * Regular maintenance * *:
-Change the oil every 2000 hours and check the dynamic balance of the impeller every 5000 hours.
3. * * Long term disuse * *: Drain the cooling water and apply anti rust grease to the shaft end.
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**Attachment: Key Torque Parameters**
-Bearing locking nut: 150-200 N · m (M20 specification).
-Shell bolts: Tighten in diagonal order (refer to the manufacturer's manual for torque).
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**Tip * *: Complex repairs (such as impeller dynamic balance correction) are recommended to be returned to the factory or carried out by professionals. Keep maintenance records (including gap values, replacement part models) for future tracking!
