**Detailed explanation of assembly steps for Roots blower**
The assembly of Roots blowers needs to be strictly carried out in accordance with specifications to ensure smooth operation, reliable sealing, and long service life. The following is a detailed assembly process, including preparation work, core assembly steps, debugging, and precautions.
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**1、 Preparation work before assembly**
**1. Check the components**
-* * Rotor (impeller) * *: Check for scratches, deformations, or cracks to ensure a smooth surface.
-Synchronous gear: Check the wear of the tooth surface, and the meshing clearance should meet the standard (usually 0.1~0.3mm).
-* * Bearing * *: Confirm no damage, flexible rotation, and good lubrication.
-Sealing components (labyrinth seal/mechanical seal/packing seal): Check for integrity, no aging or damage.
-Shell (cylinder): Check for wear or deformation on the inner wall to ensure even clearance with the rotor.
**2. Cleaning and measurement**
-Cleaning: Clean all parts with kerosene or cleaning agent and blow dry with compressed air to prevent impurities from entering.
-* * Key dimension measurement * *:
-The gap between the rotor and the housing is 0.15~0.40mm, depending on the model.
-* * Rotor mesh clearance * * (0.10~0.25mm, measured with a feeler gauge).
-* * Bearing clearance * * (according to the manufacturer's standard, avoid being too tight or too loose).
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**2、 Core assembly steps**
**1. Install bearings and synchronous gears**
-Bearing installation (recommended hot installation method):
-Heat the bearing to 80-100 ℃, expand it, and then insert it into the journal to avoid damage caused by knocking.
-Use hydraulic tools to press fit and ensure that the bearing is in contact with the shaft shoulder.
-Synchronous gear assembly:
-Install the driving gear first, then the driven gear, and adjust the mesh clearance (using a dial gauge to check).
-Tighten the gear fixing bolts and apply anti loosening glue.
**2. Install rotor**
-Insert the main rotor into the housing:
-Place the rotor horizontally with lifting tools to avoid collision.
-Adjust the axial clearance (usually 0.05~0.15mm).
-Insert the driven rotor into the housing:
-Ensure that the phase angle of the two rotors is correct (usually 120 ° misalignment for the three bladed type).
-Check whether the manual turning is flexible and free of jamming.
**3. Adjust rotor clearance * * (key step)
-* * Radial clearance * *: Measure the clearance between the rotor and the inner wall of the housing with a feeler gauge to ensure uniformity around.
-Mesh clearance: Adjust the gear position to ensure that the mesh clearance between the two rotors meets the standard (0.10~0.25mm).
-Axial clearance: Adjust the bearing seat gasket by adding or removing it to prevent axial movement of the rotor.
**4. Install end caps and seals**
-End cap assembly:
-Tighten the bolts evenly (in diagonal order) to avoid deformation caused by uneven force.
-Check the sealing surface and apply high-temperature resistant sealant if necessary.
-Sealed installation:
-Maze seal: Ensure that there is no friction between the sealing plate and the shaft.
-* * Mechanical seal * *: Adjust the compression amount of the spring to ensure that the end face fits snugly.
-Packing seal: Tighten the packing ring by ring, with moderate tightness (allowing for slight leakage lubrication).
**5. Coupling alignment**
-Use a laser centering instrument or dial gauge to calibrate the coaxiality of the motor and fan (deviation ≤ 0.05mm).
-Avoid radial or angular deviation, otherwise it may cause vibration and bearing damage.
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**3、 Inspection and debugging after assembly**
**1. Manual turning test**
-Rotate the coupling and check for smoothness, no abnormal friction or noise.
**2. Air tightness test**
-Apply pressure to the rated pressure and use soapy water to check for any air leaks at the connections such as flanges and end caps.
**3. Trial operation**
-* * No load operation (30 minutes~1 hour) * *:
-Check the current, vibration, and bearing temperature (≤ 70 ℃).
-Monitor noise and eliminate rotor collision or gear abnormal noise.
-* * Load operation (gradual boost) * *:
-Observe whether the pressure and flow rate meet the standards and whether there is any decrease in performance.
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**4、 Common Problems and Solutions**
|* * Problem * * | * * Possible Cause * * | * * Solution * *|
|-------------------|--------------------------|--------------------------------|
|* * The rotor is stuck * * | The gap is too small or foreign objects enter | Adjust the gap again and clean the housing|
|Excessive vibration * * | Poor alignment or rotor imbalance | Re align and perform dynamic balance correction|
|Bearing overheating | Insufficient lubrication or small clearance | Add lubricating grease and adjust bearing preload force|
|* * Gas leakage * * | Seal damaged or bolts not tightened | Replace seals and tighten bolts evenly|
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**5、 Key precautions**
**Violent assembly is strictly prohibited: Precise components such as rotors and gears should be handled with care.
**Gap control priority * *: The rotor gap directly affects the efficiency and lifespan of the fan.
**Lubrication in place * *: Bearings and gears require the use of specified grade lubricating grease (such as lithium based grease).
**Explosion proof requirements: When transporting flammable gases, all components must comply with explosion-proof standards.
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**Summary**
The assembly of Roots blower requires precise operation, especially rotor clearance adjustment and alignment calibration. It is recommended to have professional guidance for the first assembly and strictly follow the manufacturer's manual. Proper assembly can ensure the stable operation of the fan and extend its service life.
