Apparatus for preventing abrasion in reciprocal compressor

An apparatus for preventing abrasion in a reciprocal compressor, comprising:

• a first cylinder;
• a reciprocal motor having a stator and a mover, and generating a linear reciprocation driving force;
• a first piston coupled to the mover of the reciprocal motor, for linearly reciprocating in an inside space of the first cylinder by the linear reciprocation driving force of the reciprocal motor;
• a second cylinder coupled to the first piston to be connected to a first suction passage formed in the first piston;
• a second piston inserted into an inside space of the second cylinder to be linearly movable;
• a piston rod coupled to the second piston to be movable in the radial direction of the second piston, and fixedly coupled to a frame;
• and
• a concentricity control means coupled to a junction between the second piston and the piston rod, for fixing the second piston and the piston rod in the axial direction, and allowing a relative motion thereof in the radial direction.

An apparatus for preventing abrasion in a reciprocal compressor, comprising:

• a first cylinder;
• a reciprocal motor having a stator and a mover, and generating a linear reciprocation driving force;
• a first piston coupled to the mover of the reciprocal motor, for linearly reciprocating in an inside space of the first cylinder by the linear reciprocation driving force of the reciprocal motor;
• a frame having a suction valve and being disposed at a predetermined interval from the first piston;
• a second cylinder disposed between the frame and the first piston to be connected to a suction passage formed in the first piston and to be linearly movable in the radial direction;
• a second piston extended from one side of the first piston, and movably inserted into an inside space of the second cylinder;
• and
• a concentricity control means for fixing the second cylinder in the axial direction, and allowing the second cylinder to perform a relative motion on the frame.