Maintenance for Oil-Free Water-Lubricated Single-Screw Air Compressors in Jinzhou

Operating Characteristics of Oil-Free Water-Lubricated Single-Screw Air Compressors

This type of equipment features a single-screw rotor paired with a double-nut star wheel design, using purified or softened water as both lubricant and sealing medium to achieve zero-oil-emission compressed air. Its key advantages include high exhaust purity, low operating noise, and minimal wear on friction pairs, making it widely suitable for applications with stringent air quality requirements, such as food and pharmaceutical processing, precision electronics manufacturing, and laboratory gas supply.

Key Maintenance Steps for the Waterway System

Water is the core medium for this type of air compressor, and water quality management directly determines the equipment’s service life. The following items should be checked regularly:

• Water Quality Monitoring:Regularly test the conductivity and hardness of the incoming water to prevent scaling that could clog the nozzles. It is recommended to install a recirculating water treatment system or a water softener to ensure water quality meets the equipment’s technical specifications.
• Filter Cleaning:Y-type strainers at the water inlet tend to accumulate debris and should be disassembled and cleaned weekly to ensure a steady water flow.
• Pipeline Leak Prevention:Inspect high-pressure water pipe joints, seals, and expansion joints; promptly replace any water-pressure-resistant seals found to be leaking to prevent pressure fluctuations from affecting compression efficiency.

Maintenance Standards for the Nose Section and Drive Components

The single-screw compressor head has no direct metal-to-metal contact internally and relies primarily on a water film for isolation, but it still requires periodic structural maintenance:

• Star wheel assembly inspection:The star wheel is a wear part and its thickness and surface finish should be measured after several thousand hours of operation. If noticeable grooves or fractures appear, it must be replaced in pairs; mixing parts from different batches is strictly prohibited.
• Bearings and shaft seals:The input-end bearing is subjected to combined radial and axial loads and must be lubricated with high-temperature grease as specified in the manual. Slight water seepage from the shaft seal is normal; however, if leakage increases, adjust the compression force or replace the mechanical seal.
• Cooler Cleaning:Biofilms or mineral scale tend to accumulate on the tube walls of water-cooled heat exchangers; it is recommended to use a dedicated cleaning agent for circulating backwashing to restore heat transfer efficiency.

Recommendations for Operating Environment Adaptation in the Jinzhou Region

Jinzhou is located in the Liaoxi Corridor, where the four seasons are distinct: winters are dry and cold, while summers are relatively humid. In light of these regional characteristics, equipment management should take the following into account:

• Antifreeze measures:When the equipment is shut down for more than twelve hours in winter, all accumulated water must be drained from the housing, piping, and cooler to prevent freezing and cracking of the flow passages.
• Humidity Control:During the humid season, ventilation and dehumidification in the equipment room should be enhanced to prevent moist air from entering the intake valves, which could cause water hammer or dampen electrical components.
• Water Quality Optimization:The local water supply may be hard; it is recommended to install a pre‑treatment reverse osmosis or ion exchange system to reduce scaling risk at the source.

Standardize Shutdown and Emergency Response Procedures

The correct start-up and shutdown sequence can significantly extend the service life of critical components. When shutting down, first close the intake valve and run the unload procedure; only disconnect the power after the unit has come to a complete stop. If abnormal vibrations, a sudden rise in exhaust temperature, or unusual noises occur during operation, immediately press the emergency stop button and preserve on-site data for technicians to investigate. Operating with known faults or arbitrarily altering parameter settings is strictly prohibited.