Disassembly and inspection of multi-stage centrifugal blowers
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Inspection and repair of a multi-stage centrifugal blower used in wastewater treatment: the bearings were damaged, the unit vibrated heavily, and there was friction between the moving and stationary components; the bearings and inter-stage seals were replaced.
The recommended maintenance steps are as follows: 1. Preparations before disassembly: – Shut down the machine, disconnect the power supply, and open the housing after confirming that there is no pressure. - Inspect and record data on component wear, dimensional deviations, impeller clearance, etc. 2. Disassembly for inspection: – Disassemble the unit and remove the rotor assembly. - Inspect step by step the wear and damage of the impeller, diaphragm, diffuser, and inter-stage seals. - Check the wear condition of the journal and keyway surfaces. 3. Replace components: – Replace damaged bearings and severely worn inter-stage sealing rings. - Based on the gap data obtained from disassembly inspection, adjust the gap between the inter-stage seals and the impeller to ensure that the gaps at each stage meet the specified requirements. 4. Dynamic balance testing: – After replacing the bearings and inter-stage seals, a dynamic balance check is performed on the rotor to ensure it meets the technical standards. 5. Reinstallation: - Install the impeller, diaphragms, and other stationary components step by step in accordance with the technical requirements, to ensure proper installation accuracy and appropriate clearances. - Install the new bearing and apply lubricant of the appropriate specification. 6. Commissioning and acceptance: – After assembly, conduct a no-load test run to check whether various parameters such as vibration and temperature rise are within normal ranges. - Normal production operation is resumed only after confirming that vibration levels, noise, bearing temperature, etc., are all within specified ranges. .