Piston ring

• US 20030006562A1
• Filed: 07/08/2002
• Published: 01/09/2003
• Est. Priority Date: 07/09/2001
• Status: Abandoned Application

• Current Assignee: Burckhardt Compression Holding AG
• Original Assignee: Burckhardt Compression Holding AG
• Inventors: Feistel, Norbert
• Application Number:
  US10/191,962
• Publication Number:
  US 20030006562A1
• Time in Patent Office: Days
• US Class Current: 277/434
• CPC Class Codes: F16J 9/02 L-section rings
• CPC Class Codes: F16J 9/28 of non-metals

Abstract

The piston ring (10) for a dry-running piston compressor consists of a first and a second ring part (10a, 10b) having gaps or butt joints (10e, 10f). These two ring parts (10a, 10b) are arranged to lie mutually concentric with respect to an axis (C). The first ring part (10a) has an essentially L-shaped cross-section, having a first arm (10h) running in the direction of the axis (C) and a second arm (10g) extending outwards in a direction essentially radial to the axis (C). The second arm (10g) has a first bearing surface (10l) and the second ring part (10b) has a second bearing area (10k). The first and the second bearing areas (10l, 10k) are designed to fit perfectly on top of each other. The first and second bearing areas (10k, 10l) exhibit a discontinuity (U1,U2).

Claims

1. Piston ring (10) for a dry-running piston compressor, consisting of a first and a second ring part (10a, 10b) having gaps or butt joints (10e, 10f, in which the two ring parts (10a, 10b) are arranged to be mutually concentric relative to an axis (C) and the first ring part (10a) exhibits an essentially L-shaped cross-section having a first arm (10h) which extends in the direction of the axis (C) as well as a second arm (10g) extending outwards essentially in a direction radial to the axis (C), and in which the second arm (10g) has a first bearing surface (10l) and the second ring part (10b) has a second bearing surface (10k), and in which the first and the second bearing surfaces (10l, 10k) are designed to fit perfectly on top of each other, wherein the first and the second bearing surfaces (10k, 10l) exhibit discontinuities (U1, U2).

2. A piston ring (10) according to claim 1, wherein the discontinuities U1, U2 are arranged to be situated on top of each other.

3. A piston ring (10) according to one of the previous claims, wherein the discontinuities (U1, U2) run concentrically to the axis (C).

4. A piston ring (10) according to one of the previous claims, wherein the second ring part (10b) rests against the first arm (10h) of the first ring part (10a).

5. A piston ring (10) according to one of the previous claims, wherein the bearing surfaces (10k, 10l) extend in a direction perpendicular or essentially perpendicular to the axis (C) outwards from the discontinuity (U1, U2).

6. A piston ring (10) according to one of the previous claims, wherein the radial cross-section through the first and second ring parts (10a, 10b) exhibits a section, which starts from the discontinuity (U1, U2) and runs inwards, having a triangular or rectangular shape, or is in the shape of a segment of a circle.

7. A piston ring (10) according to one of the previous claims, wherein the bearing surfaces (10k, 10l) exhibit a step in the region of the discontinuity (U1, U2), which runs parallel or essentially parallel to the axis (C).

8. A piston ring (10) according to one of the previous claims, wherein, the first and/or the second ring parts (10a, 10b) is made of a material from the group of polytetrafluoroethylene (PTFE) polymers, modified high temperature polymers such as polyetheretherketone (PEEK), polyetherketone (PEK), polyimide (PI), polyphenyl sulphide (PPS), polybenzimidazole (PBI), polyamide imide (PAI) or a modified epoxy resin, these materials possibly containing additional solid lubricants such as carbon, graphite, molybdenum sulphide or PTFE.

9. A dry-running piston compressor having a piston ring according to one of the previous claims.