Linear compressor

A linear compressor comprising:

• a frame;
• a cylinder disposed in the frame;
• a piston disposed in the cylinder and configured to axially reciprocate in the cylinder;
• a discharge valve disposed at a first side of the piston;
• and
• a discharge cover assembly coupled to the frame and disposed at the first side of the piston,
• wherein the discharge cover assembly comprises:
• a discharge cover that defines an inner space,
• a first discharge plenum that is disposed in the inner space of the discharge cover, the first discharge plenum defining a first discharge space therein, and
• a second discharge plenum disposed between the first discharge plenum and the discharge cover, the second discharge plenum defining (i) a second discharge space in fluid communication with the first discharge space and (ii) a third discharge space in fluid communication with the second discharge space,
• wherein the second discharge space and the third discharge space are defined between the first discharge plenum and the second discharge plenum,
• wherein the first discharge plenum comprises:
• a first cylindrical body that defines the first discharge space, the first discharge space being configured to receive refrigerant discharged through the discharge valve,
• a first bottom portion that supports the first cylindrical body,
• a first pillar that protrudes from a central part of the first cylindrical body toward the discharge valve, and
• a first wall that has a ring shape protruding from the first bottom portion and surrounding the first cylindrical body,
• wherein the frame defines a first bearing communication hole,
• wherein the first bottom portion defines a second bearing communication portion in fluid communication with the third discharge space, and
• wherein the second bearing communication portion is configured to provide a portion of the refrigerant in the third discharge space to the first bearing communication hole to thereby lubricate the cylinder and the piston.