Pipeline Cutting Ring Seal Geometry for Vibration-Resistant Sealing
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Solution Overview
Problem
The existing connection arrangements for metallic pipelines are prone to loosening due to vibrations in hydraulic systems, leading to gaps between the cutting ring and the screw connection body, which can cause the soft seal to extrude and fail, and also risk damage to the seal due to sharp edges.
Innovation Solution
The connection arrangement features a ring groove for the elastomer circumferential seal positioned at a distance from the contact surface, with a conical ring surface and specific angles and contours to prevent seal extrusion and damage, including an undercut and S-shaped contour to enhance sealing and prevent sliding out, and a rounded transition to support the seal during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cutting ring is tightened against the face surface of the screw connection body to ensure sealing, then the sealing effect is improved, but the cutting ring loosens due to vibrations during operation
Solution Approach 1:
The elastomer circumferential seal is pre-installed in the ring groove at a distance from the contact surface, creating a preliminary protective barrier that prevents gap formation and seal extrusion before vibrations can cause loosening during operation
2Reliability
If the circumferential seal is positioned close to the contact surface to improve sealing, then the sealing effect is enhanced, but the seal extrudes into gaps formed during operation
Solution Approach 1:
The ring groove acts as an intermediary structure positioned between the circumferential seal and the contact surface, providing a protective chamber that prevents the seal from contacting gaps and extruding under hydraulic pressure
Solution Approach 2:
The solution moves the seal from a position directly at the contact surface to a different spatial dimension within the ring groove, distancing it from the harmful gap formation zone while maintaining sealing effectiveness
3Reliability
If the seal lies against a sharp edge to ensure contact and sealing, then the sealing effect is improved, but the risk of damage to the soft seal increases
Solution Approach 1:
The ring groove provides a locally modified quality environment for the seal, creating a protected chamber with rounded transitions that eliminates sharp edges at the seal location while maintaining effective sealing contact
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively prevents the extrusion of the soft seal into gaps and reduces the risk of damage by ensuring secure contact and flexible expansion of the seal, maintaining the sealing effect and facilitating installation.
Implementation Method 1
an elastomer circumferential seal is disposed in a ring groove in the region of the outer cone of the cutting ring, for contact inside the inner cone of the pipe holder of the screw connection body
Implementation Method 2
the cutting ring has an outer cone that interacts with an inner cone of the pipe holder of the screw connection body in such a manner that it is deformed radially inward in some regions when the union nut is tightened
Data Source
AI summary
A connection arrangement for connecting a metallic pipeline has a screw connection body having a pipe holder for the pipeline, a union nut that can be screwed onto the screw connection body and a cutting ring disposed between the screw connection body and the union nut. The cutting ring has an outer cone that interacts with an inner cone of the pipe holder of the screw connection body. The cutting ring has an essentially radial contact surface, subsequent to the outer cone, which surface limits tightening against a face surface of the screw connection body. An elastomer circumferential seal is disposed in a ring groove in the region of the outer cone of the cutting ring. The ring groove, which accommodates the elastomer circumferential seal, is disposed in the outer cone of the cutting ring, at a distance from its contact surface and, wherein a ring surface is formed between the ring groove and the contact surface.