Backup Ring With Compressible Part For Sealing Reliability
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Solution Overview
Problem
Conventional sealing devices with a backup ring structure face issues of high working costs and erroneous assembly due to dimensional tolerances, leading to potential breakage of the main sealing body under high pressure.
Innovation Solution
A sealing device with a backup ring having a symmetrical cross-sectional shape and an easily compressible part, which absorbs dimensional tolerances through compressive deformation, preventing the main sealing body from running over and reducing assembly errors, while maintaining low costs by avoiding complex groove shapes and additional parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the installing groove is worked into a particular cross sectional shape to prevent gap formation, then the sealing reliability improves, but the manufacturing cost increases
Solution Approach 1:
The patent changes the geometric parameters of the backup ring by providing a protruding portion that extends into the installing groove. This protruding portion has specific dimensional parameters (height, width) that are optimized to prevent gap formation between the backup ring and outer peripheral member, thereby ensuring sealing reliability without requiring complex groove shaping
Solution Approach 2:
The backup ring is segmented into different functional portions: a main body portion and a protruding portion. The protruding portion is specifically designed to engage with the installing groove and prevent gap formation, while the main body portion provides structural support. This segmentation allows simple groove geometry while achieving reliable sealing
2Reliability
If the backup ring is formed as a two-sided shape to close the gap, then the sealing reliability improves, but the risk of erroneous assembly increases
Solution Approach 1:
The backup ring employs asymmetric design with a protruding portion that has a specific orientation and shape. This asymmetric feature creates a unique fit with the installing groove, allowing the backup ring to be installed only in the correct orientation. The asymmetry prevents erroneous assembly while maintaining the gap-closing function for reliable sealing
3Reliability
If dimensional tolerances are reduced to eliminate gaps, then the sealing reliability improves, but the manufacturing precision requirements and cost increase
Solution Approach 1:
The protruding portion of the backup ring is designed with predetermined dimensions that compensate for dimensional tolerances in the installing groove and outer peripheral member. By beforehand designing this protruding feature, the patent ensures that even with normal manufacturing tolerances, the gap between the backup ring and outer peripheral member is prevented, eliminating the need for tight tolerance control
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 solution effectively prevents breakage by absorbing tolerances and reducing friction, ensuring secure pressure resistance without increasing costs or assembly errors, and further enhances pressure resistance with a second backup ring.
Implementation Method 1
the backup ring has a cross sectional shape which is symmetrical in a thickness direction thereof, and is formed to have an easily compressible part which can be compressed to the extent of the difference between the height and the facing distance
Data Source
AI summary
To prevent breakage of a sealing device having a main sealing body installed within an annular installing groove (31) formed in one member (3) to slidably and concentrically contact with the other member (2) and a backup ring (12) arranged at a non-sealing space side of said main sealing body, a height (h1±Δh1) of said backup ring (12) in a facing direction of a bottom surface (31a) of said installing groove (31) to the other member (2) is greater than a facing distance (L±ΔL) between the bottom surface (31a) and the other member (2), and said backup ring (12) has a cross-sectional shape which is symmetrical in a thickness direction thereof, and has an easily compressible part (12a) which can be compressed to the extent of the difference (x) between said height (h1±Δh1) and said facing distance (L±ΔL).