How do we lubricate reciprocating compressors?

Lubricating reciprocating compressors is typically accomplished through methods like force feed or splash lubrication. This approach is essential for ensuring that all moving parts, particularly pistons, bearings, and crankshafts, receive the necessary lubrication to reduce friction, wear, and heat buildup.

In force feed lubrication, oil is pumped into the compressor through oil galleries, effectively directing it to critical components. In splash lubrication, the oil is collected in a sump or reservoir at the bottom of the compressor, and as the moving parts operate, they splash the oil around, distributing it to where lubrication is needed. This method is advantageous because it allows for sufficient oil coverage on the mechanical parts without elaborate pumping systems.

Using oil pumps is also an effective lubrication method, often found in more complex or larger compressors, but the primary methods are typically the force feed and splash techniques. Grease applied externally isn't suitable for reciprocating compressors due to the high-speed and heat conditions within the compressor, causing potential issues with lubrication performance. Mixing oil with refrigerant would not effectively lubricate the compressor and could lead to other issues, such as poor heat exchange or contamination of the refrigerant system.