Understanding the Maintenance and Lubrication Methods of Industrial Chillers

The function of an industrial chiller is to lower the temperature of the chilled water, producing the chilled water required by the cooling system. During operation, all machinery experiences frictional resistance; this not only reduces efficiency but also causes wear and tear on the equipment itself. To address these issues, regular maintenance and lubrication are essential. Below, we will explore the maintenance and lubrication procedures for industrial chillers.

I. Maintenance of Industrial Chillers

1. To maintain the chiller, regularly monitor the turbidity of the chilled water and cooling water. Replace the chiller’s cooling water as needed, and inspect the chiller’s water supply system for proper operation, dripping, and leaks.

2. Check that the chiller’s pump is operating properly, inspect for mold, and ensure the switches are functioning correctly. Address any abnormalities promptly.

3. Refrigeration compressor maintenance and servicing for chillers: Under normal operating conditions, the refrigerant oil and the dry filter should be replaced in the chiller. A replacement is recommended after six months, with adjustments made based on actual operating conditions.

4. During the initial startup of the chiller, carefully monitor the compressor’s oil return and ensure it remains clean. If the oil appears impure or if oil droplets are observed, replenish or top up the oil to prevent inadequate lubrication.

5. Continuously monitor the compressor’s operating condition, check the discharge temperature, and pay particular attention to the chiller’s performance during seasonal and temperature‑difference changes. If any abnormalities are detected, promptly inspect and adjust the system’s condensing temperature and refrigerant supply.

6. Assess the noise level of the chiller. Listen for operating sounds from the water pump, cooling tower, compressor, fan, and other components; if any abnormal noises are detected, perform timely maintenance on the chiller. For troubleshooting, refer to vibrations in the compressor, discharge piping, and base mounting.

II. Lubrication Methods for Industrial Chillers

1. Oil-drip lubrication method

Use an oil cup and oil delivery pipes to supply lubricant to the designated machine components, or periodically top up the lubricant using an oil can.

2. Pressure Lubrication Method

Lubrication of pressure‑bearing parts is performed automatically by mechanical means; this method is employed in both large and medium‑sized compressors equipped with crossheads.

3. Spray Lubrication Method

The injected oil mist is carried by the accompanying gas into lubrication‑critical areas such as the cylinder; for example, super‑slipper compressors, high‑pressure compressors, and screw compressors all employ oil‑injection lubrication.

4. Oil-ring lubrication method

The rotating shaft drives a movable oil ring that is fitted onto the shaft; the oil ring, in turn, carries lubricant from the oil reservoir into the bearing, initiating a circulating lubrication cycle.

5. Splash Lubrication Method

Oil is flung onto various lubrication points by an oil‑spraying rod mounted on the connecting rod, so the cylinder and moving parts must use the same type of lubricant. This method is commonly employed in small compressors without a crosshead. However, the oil is difficult to filter, operation is inconvenient, and the oil level in industrial chillers must be strictly controlled.

The above outlines the maintenance and lubrication procedures for industrial chillers. We hope this information proves helpful.