Seal arrangement for a piston rod

摘要

The invention relates to an arrangement for sealing off a piston rod, which moves substantially rectilinearly in a reciprocating manner with respect to a passage opening, of a reciprocating-piston machine, having at least two internally clamping sealing rings, which surround the piston rod and are arranged in the region of the passage opening so as to be substantially fixed with respect to a seal housing, and are mounted in the seal housing so as to be movable in a radial direction, and between at least two seal rings there is arranged a spacer ring which is arranged spaced apart from the piston rod, so as to form, together with the seal rings and the piston rod, an accumulation chamber for medium to be sealed off, for example for oil, and the spacer ring has at least one passage for discharging medium out of the accumulation chamber.

主权项

1. An arrangement for sealing a piston rod of a reciprocating piston machine, which reciprocates essentially in a straight line relative to a through opening, comprising:
at least two internally clamping sealing rings, which are situated in a region of the through opening and are essentially stationary relative to a seal housing, and are supported in the seal housing such that the at least two sealing rings are able to move in a floating fashion; a spacer ring provided between at least two sealing rings, wherein the spacer ring is externally guided without play or with a slight amount of play in the seal housing and on a radial inside oriented toward the piston rod, the spacer ring has a greater amount of play in the radial direction; and a retention chamber formed by the spacer ring, the sealing rings and the piston rod, for sealing a medium, therein; wherein the spacer ring does not touch the piston rod, and the spacer ring is spaced apart from the piston rod; and wherein the spacer ring has at least one passage for drainage of the medium from the retention chamber, and each spacer ring has a crenellated contour along its outer circumference in a circumferential direction.