Sealing Ring Radial Segments Piston Rod Wear

Solution Overview

Problem

Existing sealing ring combinations for piston rods suffer from reduced sealing effectiveness due to wear, leading to gaps and increased leakage over time.

Innovation Solution

A sealing ring design featuring a holding ring with displaceable sealing segments and guide segments that maintain a consistent sealing action throughout the wear path, utilizing a configuration of multiple sealing segments and guide segments arranged in a specific pattern to ensure continuous sealing without deformation or significant wear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sealing segments are made displaceable in radial direction, then sealing action remains uniform throughout wear path, but device complexity increases due to multiple guide segments and holding ring structure

Engineering Contradiction:

Improvesealing action uniformityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing ring is divided into multiple independent sealing segments that can displace radially relative to the piston rod. Each sealing segment is guided by guide segments on the holding ring, allowing independent radial movement while maintaining overall sealing integrity. This segmentation enables uniform sealing action throughout the wear path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing segments are designed to be displaceable in the radial direction through guide surfaces on the holding ring. This dynamic capability allows the sealing segments to automatically adjust their position during operation, maintaining consistent sealing pressure and uniform sealing action even as wear progresses.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If sealing segments are fixed in position, then device complexity is reduced, but sealing action deteriorates after certain degree of wear due to gap formation

Engineering Contradiction:

Improvestructure simplicityVSAvoidsealing action consistency

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The sealing segments are designed to be displaceable in the radial direction through guide surfaces on the holding ring. This dynamic capability allows the sealing segments to automatically adjust their position during operation, maintaining consistent sealing pressure and uniform sealing action even as wear progresses.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The sealing segments automatically adjust their radial position through the guide surfaces during normal operation. This self-adjusting mechanism compensates for wear without requiring external intervention or complex control systems, maintaining sealing effectiveness throughout the wear path.

Inventive Principle:

Principle #25Self-service

3Reliability

If sealing segments are made displaceable with guide surfaces, then sealing reliability is improved throughout wear path, but manufacturing complexity increases

Engineering Contradiction:

Improvesealing effectivenessVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The sealing ring is divided into multiple independent sealing segments that can displace radially relative to the piston rod. Each sealing segment is guided by guide segments on the holding ring, allowing independent radial movement while maintaining overall sealing integrity. This segmentation enables uniform sealing action throughout the wear path.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing segments are designed to be displaceable in the radial direction through guide surfaces on the holding ring. This dynamic capability allows the sealing segments to automatically adjust their position during operation, maintaining consistent sealing pressure and uniform sealing action even as wear progresses.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10077842B2Sealing ring

Publication Date: 2018.09.18 BURCKHARDT COMPRESSION AG

AI summary

The invention relates to a sealing ring (1) for sealing a piston rod comprising a retaining ring (2) having a circular inside diameter (M1) and a center axis (M) and comprising a plurality of sealing segments (3), which are supported in the retaining ring (2) in such a way that the sealing segments can be moved in a direction radial to the center axis (M), wherein each sealing segment (3) has a sealing surface (3a) that is oriented toward the center axis (M) and that extends in a curved manner in a circumferential direction (U) with respect to the center axis (M), and wherein each sealing segment (3) has two lateral sealing-segment guiding surfaces (3b) extending parallel to each other, wherein the sealing surface (3a) ends at one of the two sealing-segment guiding surfaces (3b) at both ends, and wherein the retaining ring (2) comprises a plurality of guiding segments (2a) arranged at a distance from each other in the circumferential direction (U), wherein each two guiding segments (2a) following each other in the circumferential direction (U) have guiding surfaces (2b, 2c) that face each other and that extend parallel to each other, said guiding surfaces being arranged at a distance from each other in such a way and being designed in such a way that, by means of the sealing-segment guiding surfaces (3b) of the sealing segment, the sealing segment (3) is guided on the two lateral guiding surfaces (2b, 2c) and is supported on the two lateral guiding surfaces in such a way that the sealing segment can be moved in the radial direction (R), wherein guiding segments (2a) and sealing segments (3) are arranged in succession in the circumferential direction (U).