Daily Maintenance and Upkeep of Air-Suspension Blowers: A Full-Cycle Technical Guide from Preventive Maintenance to Predictive Operations

Introduction

Air suspension blower As an innovative blower, it employs air‑suspension bearing technology, using aerodynamic forces to support the rotor and enabling contactless, frictionless rotational motion between the rotor and stator. Compared with conventional Roots blowers, air‑suspension blowers offer significant advantages, including high efficiency and energy savings, the absence of mechanical wear, and the elimination of the need for a lubrication system. However, “maintenance‑free” does not equate to “requiring no attention.” Sound daily management and systematic preventive maintenance remain essential for ensuring long‑term stable operation and extending the equipment’s service life. This article systematically outlines key maintenance and upkeep considerations for air‑suspension blowers, covering four aspects: routine maintenance, periodic servicing, fault diagnosis, and operational precautions.

I. Routine Maintenance: Frequent, Lightweight Inspections

The core principle of routine maintenance is “early detection, early intervention,” with a strong focus on identifying abnormal indicators in equipment operating conditions to prevent minor issues from escalating into major failures. Operators should perform basic inspections of the equipment at each shift or daily.

1. Real-time monitoring of operating parameters

Operators should monitor control panel data in real time, including key parameters such as rotational speed, air pressure, airflow rate, motor temperature, bearing temperature, and vibration levels, ensuring that all values remain within the equipment’s rated limits. Under normal operating conditions, bearing temperature typically does not exceed 80°C; if it rises above 90°C, the unit must be shut down immediately for troubleshooting. During normal operation, air‑suspended blowers exhibit very low vibration levels, generally below 2.5 mm/s; any noticeable vibration or unusual noise warrants immediate shutdown and inspection.

2. Intake System Inspection

The air filter is one of the components of an air‑suspended blower most susceptible to environmental influences. At the start of each shift, the differential pressure across the air filter should be checked and recorded; when the pressure drop exceeds the equipment’s specified limit (typically 2–3 kPa), the filter element must be cleaned or replaced immediately. Operating the unit without a filter is strictly prohibited, as dust and particulates entering the air‑bearing area can lead to premature equipment failure. In addition, the environment around the air inlet must be inspected to ensure it is free of dust, oil contamination, moisture, and corrosive gases.

3. Visual and Piping Inspection

Inspect the fan unit and its base for looseness, and check the pipeline flanges for air leaks. Verify that the silencer and vent valve are functioning properly. Keep the equipment’s exterior clean, free of dust and oil buildup. Also ensure that the installation area is well-ventilated and adequately cooled, and that the control cabinet remains dry and clean.

4. Dust removal

During operation, air‑suspended blowers accumulate dust from the ambient air, which can impair their performance. Gently remove the dust using a soft‑bristled brush or a blower; never use cleaning agents containing solvents. When cleaning both the exterior and interior of the blower, avoid wiping with a damp cloth to prevent moisture from causing electrical short circuits.

II. Regular Maintenance: Tiered, Cycle-Based In-Depth Servicing

Regular maintenance requires thorough inspections of the equipment’s core components—air bearings, motors, and control systems—to ensure that precision structures remain undamaged and to calibrate critical parameters. It is recommended to perform tiered maintenance according to the following schedule.

1. Weekly maintenance

Focus on filter cleaning. For detachable filter elements, remove them and use compressed air to blow inward from the outside (at a pressure ≤ 0.5 MPa to prevent damage from excessive pressure); if the filter element is made of paper, replace it immediately if any tears or damage are detected. Under normal operating conditions, inspect the filter element once a month; in dusty environments, shorten the inspection interval.

2. Monthly maintenance

• Air Bearing System Inspection : Verify that the bearing supply air pressure is within the normal range (typically 0.4–0.6 MPa; refer to the equipment manual). Insufficient pressure can cause bearing levitation failure.
• Electrical System Inspection : Inspect the wiring terminals inside the control cabinet for looseness, overheating, or discoloration, and tighten any loose components. Clean dust from the interior of the control cabinet and verify that the cooling fans are operating normally.
• Cooling System Inspection If the equipment is equipped with a water-cooling system, check the coolant tank level and top up with deionized or distilled water if necessary (do not use tap water to prevent scale buildup and blockages in the piping). Replace the coolant once a month.

3. Quarterly maintenance

• Parameter calibration : Calibrate the current, voltage, and air pressure readings on the control panel using professional instruments, ensuring that the deviation from the actual values does not exceed 3%.
• Mechanical component fastening : Use a torque wrench to inspect the motor base mounting bolts and bearing housing fixing bolts, and retighten them to the torque values specified in the equipment manual.
• In-depth maintenance of the cooling system For air-cooled models, clean dust from the radiator fins using compressed air or a brush; for water-cooled models, check the cooling water flow rate and temperature (inlet water temperature ≤ 35°C), and flush scale from the cooling circuit.

4. Semi-annual maintenance

• Air Bearing Condition Monitoring : Use the control panel to check whether the bearing floating current is stable; if the current fluctuates significantly, contact the manufacturer to inspect the bearing clearance.
• Impeller Inspection : After shutting down, open the machine housing and inspect the impeller surface for dust or scale buildup. Wipe it clean with a soft cloth (do not use hard objects to scrape).

5. Deep-level maintenance (every 8,000 hours)

It is recommended to conduct a professional inspection every 8,000 operating hours or once a year—whichever comes first—covering the replacement of air‑bearing assemblies, firmware updates for the controller, and full‑load testing. Given the lack of on‑site dynamic balancing equipment and specialized inverter test instruments, in-depth maintenance of critical components should be performed by the manufacturer’s technical personnel.

III. Common Faults and Troubleshooting Methods

Although air‑suspended blowers have a low failure rate, understanding how to address common malfunctions can help restore production quickly.

1. The equipment fails to start or shuts down automatically.

First, check the alarm codes displayed on the control panel. Common causes include power supply failure or voltage abnormalities, poor contact in the control wiring, and activation of the controller’s protective functions. When troubleshooting local control, try starting the equipment using its built-in local control panel; if it starts, this indicates a fault in the remote control wiring or the signal module.

2. Overcurrent operation or motor overload tripping

Check whether the air intake filter is clogged (replace if the pressure differential exceeds 800 Pa), or whether the inverter parameters are configured incorrectly. Also, verify that the outlet ductwork is unobstructed and that all valves are fully open.

3. Overtemperature Alarm

Possible causes include dust buildup blocking the radiator, excessively high ambient temperatures or poor ventilation, and a malfunctioning cooling fan. You should clean the radiator, improve the equipment’s ventilation, and check the cooling fan’s operating condition.

4. Insufficient airflow or pressure

First, check whether the filter element is clogged—over 90% of such failures are caused by air‑intake blockages or improper valve opening. Also, inspect the pipeline connections for leaks and verify that the inverter’s parameter settings are appropriate.

5. Excessive vibration or unusual noises

Check whether the anchor bolts are loose, whether the inlet and outlet flexible connectors are damaged, or whether there are any rigid pipe connections. If the impeller’s dynamic balance has been compromised—due to scaling or impact from foreign objects—it must be returned to the factory for cleaning and undergo a dynamic balancing test. Abnormal noises, such as metallic friction, may indicate impeller collision or bearing failure; the equipment should be shut down immediately for inspection.

6. Surge

During operation, a periodic low-frequency “humming” sound is emitted, and the outlet pressure fluctuates significantly—typically because the actual operating point falls below the fan’s minimum flow line. To address this, open the vent valve or bypass valve to increase flow, and adjust the inverter’s lower frequency limit.

IV. Strictly Avoided Operational Prohibitions

The precision‑engineered design of air‑suspension blowers places extremely high demands on operation and maintenance; the following prohibited procedures must be strictly avoided:

1. Starting without gas supply is prohibited.

Air bearings rely on compressed air to form a levitation film; before startup, ensure that the bearing’s supply pressure meets the specified requirement (typically 0.4 MPa or higher). Do not start the motor without air supply, as this can result in direct friction between the bearing and the rotor, leading to immediate damage.

2. Overloading is prohibited.

During operation, the equipment’s air pressure and airflow must not exceed their rated values; overload can cause motor overheating and increased bearing loads, thereby reducing service life.

3. Do not inhale impurities or corrosive gases.

The air inlet must be equipped with an air filter that meets the specified requirements; ingestion of dust, moisture, oil mist, or corrosive gases is prohibited. Contaminants can clog the bearing nozzles, and corrosive gases can corrode the rotor and bearings.

4. Disassembling core components on your own is prohibited.

Disassembly and reassembly of precision components such as air bearings, rotors, and motor stators require specialized tools and manufacturer‑provided technical guidance; attempting to disassemble them yourself may result in component deformation and loss of accuracy.

5. It is prohibited to disconnect the power supply immediately after shutdown.

After the equipment is shut down, wait until the rotor has come to a complete stop—typically 5 to 10 minutes—and ensure that the bearing air supply pressure has dropped to zero before disconnecting the main power supply. This prevents sudden power loss while the rotor is still rotating, which could cause bearing depressurization and subsequent friction.

6. Do not wash the filter with water.

The filter must not be washed with water, as this may cause damage or reduce its performance.

V. Establish and Maintain Records

It is recommended to establish a comprehensive maintenance record for each piece of equipment, documenting the following:

• Equipment model, serial number, installation date
• Daily Inspection Records (Operating Parameters, Visual Inspection Results)
• Filter Cartridge Cleaning and Replacement Log
• Cooling System Maintenance Log
• Fault Handling Record
• Manufacturer’s Professional Maintenance Records

A comprehensive maintenance record not only serves as the foundation for equipment management but also enables the operations and maintenance team to anticipate potential risks by analyzing data trends. The cost of preventive maintenance is just one-fifth that of post‑failure repairs. A high‑quality air‑suspension blower, when installed according to specifications and subjected to meticulous daily upkeep, can reliably operate continuously for more than five years without major overhauls.

Conclusion

Air‑suspended blowers, with their outstanding advantages of high efficiency, energy savings, and low maintenance costs, are gradually replacing conventional blower equipment across a wide range of industries, including wastewater treatment, cement and building materials, thermal power generation, food fermentation, and biopharmaceuticals. However, no precision equipment can function effectively without sound management and proper maintenance. Only by seamlessly integrating routine inspections, scheduled servicing, fault diagnosis, and standardized operating procedures can the technological benefits of air‑suspended blowers be fully realized, ensuring long‑term, stable operation. We hope this article will serve as a valuable reference and guide for equipment operation and maintenance professionals.