Piston compressor and refrigeration system having the same

A refrigeration system, comprising a piston compressor, the piston compressor comprising:

• a crankcase formed with a crankshaft hole therein and provided with a mounting protrusion at an upper end thereof, wherein the crankshaft hole runs upward through the mounting protrusion;
• a thrust bearing fitted over the mounting protrusion;
• a crankshaft rotatably disposed within the crankshaft hole, having a thrust part, and formed with an oil supply passage therein, wherein a lower end face of the thrust part is abutted against an upper end face of the thrust bearing,
• wherein a cavity is defined by the mounting protrusion, the thrust bearing, and the thrust part, and a through hole is formed in a peripheral wall of the crankshaft for communicating the oil supply passage with the cavity.

A piston compressor, comprising:

• a crankcase formed with a crankshaft hole therein and provided with a mounting protrusion at an upper end thereof, wherein the crankshaft hole runs upward through the mounting protrusion;
• a thrust bearing fitted over the mounting protrusion;
• a crankshaft rotatably disposed within the crankshaft hole, having a thrust part integrally formed with the crankshaft, and formed with an oil supply passage therein, wherein a lower end face of the thrust part is abutted against an upper end face of the thrust bearing,
• wherein a cavity is defined by the mounting protrusion, the thrust bearing, and the thrust part, and a through hole is formed in a peripheral wall of the crankshaft for communicating the oil supply passage with the cavity.