Composite Sealing Ring Structure for Low-Friction Reciprocating Seals
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Solution Overview
Problem
Existing sealing structures in oil cylinders face challenges with excessive friction leading to seal failure and reduced service life due to difficulties in controlling the fit between sealing mating surfaces, especially with composite sealing rings.
Innovation Solution
A composite sealing structure comprising a solid regular-shaped sealing ring and a second sealing ring with an annular protrusion, clearance gaps, and a mounting groove design that allows the solid ring to deform, providing anti-displacement and sealing fits to manage friction and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If O-rings are used alone for sealing, then sealing performance can be achieved, but excessive friction occurs causing the O-ring to be dislodged from the mounting groove
Solution Approach 1:
The sealing ring is divided into two distinct parts: a first sealing ring made of soft material for conforming to the mounting groove, and a second sealing ring made of hard material for providing the sealing contact surface. This segmentation allows each part to perform its specific function optimally without the friction problems of single-material O-rings
Solution Approach 2:
The invention uses a composite sealing ring structure combining soft and hard materials. The first sealing ring uses soft material (e.g., rubber) while the second sealing ring uses hard material (e.g., PTFE), creating a composite structure that leverages the advantages of both materials to reduce friction while maintaining sealing effectiveness
2Reliability
If composite sealing rings are employed to ensure sealing performance, then sealing reliability improves, but the internal fit requires improvement and excessive friction still occurs
Solution Approach 1:
Different regions of the sealing ring are assigned different material properties: the first sealing ring portion has soft material properties for conforming to the mounting groove, while the second sealing ring portion has hard material properties for providing a precise sealing surface. This local quality differentiation resolves the internal fit issue while maintaining sealing performance
3Stability of the object's composition
If the sealing ring is made harder to maintain shape, then sealing stability improves, but friction increases causing heat generation and reduced service life
Solution Approach 1:
The composite structure combines hard material in the second sealing ring for shape stability with soft material in the first sealing ring for low-friction contact. This composite approach maintains sealing stability while reducing heat generation through the soft material's ability to conform and reduce friction
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 ensures stable sealing performance under both low and high pressures, prevents dislodging, reduces friction, and maintains smooth motion, enhancing the service life and positional stability of the sealing structure.
Implementation Method 1
clearance gaps are provided between both sidewalls of the mounting groove for the solid regular-shaped sealing ring and the solid regular-shaped sealing ring itself, allowing the solid regular-shaped sealing ring to freely deform toward both sides under pressure
Implementation Method 2
the solid regular-shaped sealing ring is softer than the second sealing ring, moreover, clearance gaps are provided between both sidewalls of the mounting groove for the solid regular-shaped sealing ring and the solid regular-shaped sealing ring itself, allowing the solid regular-shaped sealing ring to freely deform toward both sides under pressure
Implementation Method 3
the outer surface is provided with an annular protrusion to form a sealing fit with the sealing mating surface
Implementation Method 4
The second sealing ring is further provided with side surfaces located between the inner surface and the outer surface, wherein the side surfaces are configured to form an anti-displacement fit with the mounting groove of the sealing structure
Data Source
AI summary
The present invention provides a sealing structure, comprising a solid regular-shaped sealing ring and a second sealing ring. The inner surface of the second sealing ring is provided with a mounting groove for the solid regular-shaped sealing ring, and the outer surface is provided with an annular protrusion to form a sealing fit with a sealing mating surface. The solid regular-shaped sealing ring is softer than the second sealing ring, and clearance gaps are provided between the two sidewalls of the mounting groove and the solid regular-shaped sealing ring, allowing the solid regular-shaped sealing ring to freely deform toward both sides when subjected to pressure. A groove is further provided at the centerline of the bottom of the mounting groove. The sealing structure of the present invention can be applied in various scenarios such as oil cylinders, and is capable of ensuring sealing performance while controlling the friction between sealing mating surfaces, thereby preventing excessive friction. In addition, it improves the internal structure of the composite sealing ring and enhances sealing stability during reciprocating motion.