Sealed compressor and refrigeration unit including sealed compressor

A sealed compressor comprising:

• an electric component including a stator and a rotor;
• a compression component actuated by the electric component;
• and
• a sealed container accommodating the electric component and the compression component and storing lubricating oil for lubricating the compression component;
• wherein the compression component includes a shaft including a main shaft section to which the rotor is fastened and an eccentric shaft section, a cylinder block accommodating a piston reciprocatable according to rotation of the shaft, a main bearing unit mounted on the cylinder block to support the main shaft section, and a thrust ball bearing disposed between a flange surface formed in the shaft and a thrust surface formed in the main bearing unit;
• the main shaft section is provided with a first oil feeding passage to transport the lubricating oil from a lower portion of the main shaft section to an upper portion of the main shaft section;
• the thrust ball bearing includes a plurality of balls held in a cage, an upper race disposed such that one of its main surfaces is in contact with upper portions of the balls;
• and
• a lower race disposed such that one of its main surfaces is in contact with lower portions of the balls;
• the main surface of the upper race and the main surface of the lower race face each other;
• at least one of the main surface of the upper race and the main surface of the lower race, the main surfaces facing each other, is provided with a raceway groove which is formed by an annular groove, and in which the balls are placed;
• and
• the thrust ball bearing is provided with a second oil feeding passage communicated with the first oil feeding passage and configured to feed the lubricating oil to the raceway groove and a discharge passage through which the lubricating oil fed to the raceway groove is discharged to outside of the thrust ball bearing.