Joined Resin Seal Ring Geometry for Precise Rotary Sealing
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Solution Overview
Problem
Existing seal rings fail to achieve a precise fit with cylindrical surfaces, leading to gaps and reduced sealing effectiveness between rotating members.
Innovation Solution
A circular annular seal ring formed from an elongated arcuate rod with a junction, featuring a radial thickness that decreases from two points separated by an angle of 60 to 150 degrees, ensuring a close approximation to a true cylindrical shape on both inner and outer surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a seal ring is formed from an elongated arcuate rod by joining ends to form a circle, then the seal ring can be manufactured and installed, but a gap is generated between the member to be sealed and the seal ring due to the junction formation
Solution Approach 1:
The seal ring employs non-uniform radial thickness distribution, being thinner at the junction and thicker at points 60-150 degrees away from the junction. This local variation in thickness compensates for the gap caused by joining, maintaining a true cylindrical outer surface that closely fits the member to be sealed, thereby resolving the contradiction between ease of manufacture and sealing precision.
2Manufacturing precision
If the radial thickness of the seal ring is non-uniform to compensate for junction gap, then the outer peripheral surface approximates a true cylindrical shape, but the structural complexity increases
Solution Approach 1:
The seal ring changes the radial thickness parameter along its circumference, creating a controlled non-uniform distribution where thickness decreases toward the junction and increases at points 60-150 degrees away. This parameter variation enables the outer peripheral surface to approximate a true cylindrical shape, improving sealing precision while the gradual change keeps structural complexity manageable.
Data Source
AI summary
A circular annular seal ring made from a resin is adapted to be disposed between an outer member and an inner member that rotate relative to each other. The seal ring is disposed in a circumferential groove of the outer member or the inner member to isolate a liquid space from an external space. The seal ring is formed from an elongated and arcuate rod to define a circle by joining ends of the rod, and has a junction formed from the ends. The seal ring has a radial thickness gradually decreasing from two points that are apart from the junction toward the junction. The points are separated from the junction by an angle of not less than 60 degrees and not more than 150 degrees about a central axis of the circle.