Piston compressor

A piston compressor comprising:

• a crankcase;
• a crankshaft arranged in the crankcase;
• connecting rods;
• a cross head with arranged piston rod;
• a piston compressor housing;
• a cylinder;
• a piston fastened to the piston rod, the piston being dry-running guided in the cylinder;
• valves;
• a piston rod sealing device arranged around the piston rod between the cylinder and the crankcase, the piston rod sealing device comprising:
• a gland housing, which is inserted into the piston compressor housing;
• and
• a gland device arranged in the gland housing, the gland device comprising:
• a gland;
• and a gland jacket into which the gland is pushed;
• a movable intermediate ring;
• a tilting elements housing arranged in a recess of the gland housing;
• a gland flange rigidly connected to the gland housing and to the piston compressor housing;
• a fixed ring arranged in a recess of the gland flange;
• a plurality of spherically acting tilting elements, which are arranged around a vertical axis of the piston rod between the movable intermediate ring and the fixed ring;
• and
• a tilting ring arranged in a recess of the intermediate ring,
• wherein the gland defines with the piston rod a sealing gap, which is open over a common longitudinal section and has a width in a μm range, and which is configured to allow a leakage flow of compressed medium through the sealing gap,
• wherein the gland and the gland jacket are each comprised of different materials providing a resulting coefficient of thermal expansion based on the coefficient of thermal expansion of the gland and the coefficient of thermal expansion of the gland jacket and the resulting coefficient of thermal expansion is matched to the coefficient of thermal expansion of a material of the piston rod,
• wherein the gland device is connected flush and tightly sealed to the movable intermediate ring, which movable intermediate ring is arranged in a recess of the gland housing between the gland device and the tilting pin housing that is arranged in the recess of the gland housing,
• wherein the gland device is in connection via the intermediate ring and the tilting pin housing with the fixed ring that is arranged in a recess of the gland flange,
• wherein the gland device is supported without lateral forces on the gland flange with the plurality of spherical elements,
• wherein the gland device allows an adjustment of an oblique position of the piston rod with a reduced force action of the piston rod on the gland device via the tilting ring.