Qingshan Single-Screw Oil-Free Water-Lubricated Air Compressor Maintenance

Water Cycle and Water Quality Management

Water-lubricated air compressors rely on pure water as both the lubricant and the cooling medium, so water quality directly affects the service life of the equipment’s critical components. The conductivity and pH of the circulating water must be monitored regularly to ensure compliance with operational specifications. It is recommended to install multi-stage filtration at the inlet and to replace the filter elements according to the actual operating conditions, thereby preventing suspended particles from entering the sliding tracks and causing scratches.

Key points for routine inspections:

• Check the water tank level and the sensitivity of the automatic make-up valve weekly.
• Disassemble and clean the main water line filter monthly to maintain a stable design flow rate.
• Before seasonal shutdown, the pipelines must be thoroughly drained to eliminate standing water and prevent microbial growth and hard scale formation.

Maintenance of Water-Lubricated Seal Assembly

This type of unit dispenses with conventional lubricating oil films and instead employs radial and axial sealing rings made of polymer composite materials. The seals undergo natural running-in under water flow; therefore, it is necessary to periodically measure the mating clearances and surface roughness. If increased effluent turbidity or abnormal localized temperature rise is observed, the seal system assessment procedure should be initiated.

Disassembly, Assembly, and Replacement Specifications:

• Conduct performance verification strictly in accordance with the mileage or operating-hour milestones specified in the technical manual.
• During work, do not allow sharp metal objects to come into direct contact with mating surfaces; insulated non-metallic pry tools should be used whenever possible.
• Replacement parts must be purchased after verifying the original material grade to ensure wear resistance, coefficient of thermal expansion, and compatibility with the aqueous medium.

Single-screw compressor host operation monitoring

The single-screw drive architecture offers inherent force self-balancing, resulting in a relatively stable vibration spectrum across the entire machine; however, microscopic changes at the mating surfaces of the driving and driven rotors still warrant close monitoring. By listening for abnormal bearing noises and tracking exhaust temperature gradients and pressure pulsations, early signs of mechanical fatigue can be accurately identified. Maintaining a smooth opening of the intake control valve effectively mitigates alternating stresses caused by frequent loading and卸载 of the compressor.

Key Monitoring Metrics:

• The exhaust temperature remains within a safe range, eliminating the risk of seizure due to thermal expansion.
• The machine’s vibration amplitude has not exceeded the factory-set limit, and the foundation mounting bolts have been re-torqued.
• Collect three-phase current data periodically to verify power transmission efficiency and load balancing.

Electrical Control System and Safety Protection

The intelligent control cabinet handles multi‑circuit signal acquisition and logical operations. During maintenance, priority should be given to cleaning the inverter’s cooling air ducts, tightening the low‑voltage terminal blocks to prevent loosening, and fully exporting the parameter configuration files. All pressure relief valves, high‑temperature cutouts, and dry‑run protection devices must undergo scheduled inspection and calibration to ensure that their activation mechanisms remain absolutely reliable under extreme operating conditions.

Standardized Maintenance Cycle Planning

Establishing a tiered maintenance system is fundamental to ensuring efficient equipment operation. It is recommended to structure maintenance activities into three levels: daily inspections, weekly checks, and quarterly servicing. Specifically, perform daily verification of operating panel readings and external leak conditions; conduct weekly centralized condensate drainage and dust removal from air-cooled heat sinks; and carry out quarterly internal pipeline flushing and random torque inspections of fasteners. Adhering to a preventive maintenance strategy can significantly reduce unplanned downtime and enhance overall gas supply reliability.