Oil scraper ring for a piston rod

A sealing pack for sealing a translationally oscillating piston rod, the sealing pack comprising:

• a pack housing;
• a number of sealing rings arranged axially in succession, the sealing rings including at least one scraper ring configured and arranged for scraping oil from the piston rod, the at least one scraper ring including
• a radially outer circumferential surface including at least one outer circumferential groove that receives an annular spring configured and arranged to radially prestress the scraper ring,
• a radially inner circumferential surface including a plurality of sealing sections, each of the plurality of sealing sections including a scraping edge,
• a plurality of inner circumferential grooves that axially space apart adjacent sealing sections of the plurality of sealing sections,
• a first axial ring end,
• a second axial ring end,
• at least one recess radially penetrating the scraper ring is provided on a circumference of the scraper ring, the at least one recess extends at least partially from the first axial ring end of the scraper ring to the second axial ring end of the scraper ring, the at least one recess extends helically along the outer circumferential surface of the scraper ring, wherein the pitch of the helix is between 0.1 and 10, the at least one recess is configured and arranged to adjust the scraper ring in the circumferential direction, at least in the region of the plurality of sealing sections on the first axial ring end of the scraper ring, and wherein the at least one recess extends at least in sections in a direction deviating from an axial direction of the scraper ring, and
• at least two drainage openings are provided on the radially outer circumferential surface of the scraper ring, each of which extends helically and in the shape of a groove from the first axial ring end of said scraper ring partially in the direction of the second axial ring end, wherein each of the at least two drainage openings are connected to multiple inner circumferential grooves of the plurality of inner circumferential grooves, and are configured and arranged for removing scraped oil from the multiple inner circumferential grooves, and wherein the at least two drainage openings extend in parallel to the at least one recess.

A piston compressor comprising:

• a compressor housing including
• at least one cylinder housing situated therein, and
• at least one scraper ring;
• a piston configured and arranged to oscillate translationally within the at least one cylinder housing;
• a piston rod connected to the piston;
• and
• wherein the at least one scraper ring is configured and arranged for scraping oil from the piston rod, the at least one scraper ring including
• a radially outer circumferential surface including at least one outer circumferential groove that receives an annular spring configured and arranged to radially prestress the scraper ring,
• a radially inner circumferential surface including a plurality of sealing sections, each of the plurality of sealing sections including a scraping edge,
• a plurality of inner circumferential grooves that axially space apart adjacent sealing sections of the plurality of sealing sections,
• a first axial ring end,
• a second axial ring end,
• at least one recess radially penetrating the scraper ring is provided on a circumference of the scraper ring, the at least one recess extends at least partially from the first axial ring end of the scraper ring to the second axial ring end of the scraper ring, the at least one recess extends helically along the outer circumferential surface of the scraper ring, wherein the pitch of the helix is between 0.1 and 10, the at least one recess is configured and arranged to adjust the scraper ring in the circumferential direction, at least in the region of the plurality of sealing sections on the first axial ring end of the scraper ring, and wherein the at least one recess extends at least in sections in a direction deviating from an axial direction of the scraper ring, and
• at least two drainage openings are provided on the radially outer circumferential surface of the scraper ring, each of which extends helically and in the shape of a groove from the first axial ring end of said scraper ring partially in the direction of the second axial ring end, wherein each of the at least two drainage openings are connected to multiple inner circumferential grooves of the plurality of inner circumferential grooves, and are configured and arranged for removing scraped oil from the inner circumferential grooves, and wherein the at least two drainage openings extend in parallel to the at least one recess.