Seal Ring Backup Device with Scarf Cut for Blind Glands
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Solution Overview
Problem
Current seal ring backup devices are ineffective in preventing extrusion in blind glands, where the inner diameter is smaller than the outer diameter, and cannot accommodate varying seal ring sizes and shapes, leading to potential seal failure under high pressure and temperature conditions.
Innovation Solution
A seal ring backup device with a scarf cut, configured to fit various gland types, including blind glands, featuring an annular body with a compound angle cut that expands to close clearance gaps and prevent extrusion, made from rigid materials like metals and elastomers, allowing for a wedge-type seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional seal ring backup device is used in a blind gland, then the gland structure is simple and compact, but the backup device cannot fit into the gland cavity and prevent extrusion
Solution Approach 1:
The backup device is divided into a body portion and a protrusion portion. The protrusion portion extends through the seal ring and engages with the gland cavity wall, while the body portion provides structural support. This segmentation allows the backup device to fit into blind glands while maintaining extrusion prevention capability.
Solution Approach 2:
The backup device transitions from a traditional two-dimensional ring shape to a three-dimensional structure with a protrusion extending axially through the seal ring. This dimensional change enables engagement with the gland cavity wall in blind gland configurations, solving the adaptability problem.
2Strength
If the backup device is made from rigid materials, then extrusion resistance is improved, but the device cannot accommodate varying seal ring sizes and shapes
Solution Approach 1:
The backup device features a protrusion portion with specific geometric characteristics (cross-sectional shape matching the gland cavity) that provides localized engagement and support. This local quality enhancement allows rigid material strength to be applied precisely where needed for extrusion resistance while maintaining adaptability to different seal ring configurations.
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
The scarf cut design effectively prevents extrusion in blind glands and accommodates a range of seal ring sizes and shapes, enhancing the seal's durability and pressure rating, even with softer elastomers, by ensuring immediate contact and closure of clearance gaps.
Implementation Method 1
the scarf cut design effectively prevents extrusion in blind glands and accommodates a range of seal ring sizes and shapes, enhancing the seal's durability and pressure rating, even with softer elastomers, by ensuring immediate contact and closure of clearance gaps
Data Source
AI summary
The present invention relates to seal ring back-up devices suitable for use on glands in sealing systems. In particular, the present invention relates to seal ring back-up devices that have been designed to fit into essentially all types of glands and close extrusion gaps. Some embodiments of the present invention provide a seal ring back-up device having an annular body having an inner diameter, an outer diameter, and a scarf cut; and where the annular body is configured to fit a gland and engage a seal ring.