D-Shaped Sealing Ring Coupling Anti-Twist Design
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Solution Overview
Problem
Existing fluid line couplings face issues with sealing ring twisting and dropout due to lack of effective securing mechanisms, particularly in designs with round cross sections, which compromise sealing integrity and reliability.
Innovation Solution
The coupling incorporates a D-shaped sealing ring with a retaining collar featuring oblique walls and a step with a contact surface, ensuring the sealing ring is securely positioned and resistant to twisting, enhancing its rigidity and preventing dropout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a round cross-section sealing ring is used, then the coupling can be made small in cross section, but the sealing ring is prone to twisting and dropout
Solution Approach 1:
The sealing ring is designed with a D-shaped cross section instead of a round cross section. This asymmetric shape prevents the sealing ring from rotating or twisting within the coupling, as the flat side cannot align with the curved wall in multiple orientations. The D-shape maintains compact dimensions while providing inherent anti-twist functionality through its geometric asymmetry.
Solution Approach 2:
The retaining collar is designed with oblique walls that extend beyond the planar support surface, creating a three-dimensional retaining structure. This additional dimensional feature (the oblique walls projecting outward) provides mechanical engagement surfaces that prevent the sealing ring from dropping out or twisting, adding a spatial constraint dimension to the sealing arrangement.
2Volume of moving object
If the sealing ring is made slender to reduce coupling size, then the coupling becomes more compact, but the sealing ring loses rigidity and twists easily
Solution Approach 1:
The D-shaped cross section of the sealing ring provides inherent resistance to twisting by eliminating rotational symmetry. The flat side and curved side create a preferred orientation that prevents the slender sealing ring from rotating under pressure or during installation, thereby maintaining rigidity without increasing the overall coupling size.
Solution Approach 2:
The retaining collar with oblique walls projecting beyond the support surface creates additional mechanical constraints in three-dimensional space. These oblique walls provide contact surfaces that prevent the slender sealing ring from twisting or deforming, effectively reinforcing the sealing ring's rigidity through external geometric constraints rather than increasing the sealing ring's own dimensions.
3Device complexity
If no retaining structure is provided, then the coupling structure remains simple, but the sealing ring can dropout under radial forces
Solution Approach 1:
The retaining collar is designed with oblique walls that project beyond the planar support surface in the radial direction. This three-dimensional configuration creates mechanical engagement surfaces that physically block the sealing ring from dropping out under radial forces. The oblique walls provide a geometric constraint that prevents displacement while adding minimal structural complexity.
Solution Approach 2:
The retaining collar acts as an intermediary structure between the coupling wall and the sealing ring. The oblique walls of the retaining collar provide intermediate contact surfaces that mechanically engage with or constrain the sealing ring, preventing dropout without requiring direct complex integration between the coupling and sealing ring.
Data Source
AI summary
The invention relates to a coupling for a fluid line arrangement, said coupling being characterised in that a plane outer side (8) of at least one essentially D-shaped sealing ring (7) of a sealing unit is applied to a plane supporting layer (10) of a receiving section (3) of a coupling part (1). In this way, in addition to a high twist rigidity of the sealing ring (7) in question, a very effective sealing action is achieved, even in the presence of comparatively weak radial pressure forces.