Patent ID: 8512015

Claim:
A piston refrigeration compressor comprising: a crank, a plurality of compression units extending transversely to a rotational axis of the crank, each compression unit having a cylinder head comprising a refrigerant suction chamber and a refrigerant discharge chamber, a refrigerant distribution device having a distribution pipe and bypass pipes putting the distribution pipe and the suction chambers in communication, a refrigerant discharge device having a discharge pipe and bypass pipes putting the discharge pipe and the discharge chambers in communication, wherein the compressor also comprises a pressure equilibration means arranged to put the suction chambers of at least two compression units and/or the discharge chambers of at least two compression units in communication, the pressure equilibration means having at least one equilibration pipe arranged to put the suction chambers of at least two compression units in communication, and/or at least one equilibration pipe arranged to put the discharge chambers of at least two compression units in communication, and in that at least one of the equilibration pipes extends outside the compressor.