Insert Coupling with Axially Fixed Sealing and Visual Engagement
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Solution Overview
Problem
Existing insert couplings face challenges in ensuring correct engagement visibility during assembly, increased component complexity, and potential sealing issues due to axial displacement of sealing elements, leading to unreliable tightness and increased assembly complexity.
Innovation Solution
The design features a sleeve-shaped coupling body with a housing and a tubular insert part having a circumferential retaining rib, along with a coupling element that includes radially moveable engagement hooks and a ring-shaped body with parallel webs and straps, allowing for visible engagement verification and maintaining sealing integrity through a ring space with axially fixed sealing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism with radially displaceable components is used to engage behind the retaining rib, then the coupling provides secure locking, but correct engagement is not visible from the outside and assembly complexity increases
Solution Approach 1:
The patent uses visual indicators (color changes or visible markings) on the coupling elements to show engagement status. When the coupling element is correctly positioned and locked, visual features become visible or change appearance, allowing operators to verify correct engagement without disassembly or complex mechanisms.
Solution Approach 2:
The coupling mechanism is designed to automatically indicate its own engagement status through visible features that appear or change when locking occurs. The system self-verifys its state without requiring external inspection tools or complex indicator mechanisms.
2Ease of operation
If the sleeve is made axially displaceable to allow release of the coupled state, then the coupling can be released, but the O-rings are pushed into end positions during insertion and pressure exposure, allowing dirt entry and risking seal integrity
Solution Approach 1:
The sealing elements are pre-positioned in optimal sealing locations before the coupling operation begins. The design ensures that sealing surfaces are already in their correct positions and do not require axial movement during operation, preventing dirt contamination and maintaining seal integrity throughout the coupling and release cycle.
Solution Approach 2:
The patent separates the sealing function from the axially moving components. Sealing elements are positioned on stationary components or are designed to remain in fixed sealing positions while other parts move axially, preventing the sealing surfaces from being pushed into end positions where dirt could enter.
3Reliability
If multiple components are used to achieve locking and sealing functions, then the coupling provides reliable operation, but the number of components increases and construction becomes complicated
Solution Approach 1:
The patent combines multiple functions (locking, sealing, and visual indication) into integrated components. A single coupling element performs locking through radial displacement while maintaining sealing through integrated sealing surfaces, and provides visual indication through integrated visual features, reducing the total number of separate components while maintaining reliability.
Solution Approach 2:
The coupling elements are designed as multi-functional components that simultaneously provide locking action, sealing surfaces, and visual engagement indicators. This universal design reduces component count by eliminating the need for separate locking mechanisms, sealing elements, and indicator devices.
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
This configuration simplifies assembly by ensuring visible engagement verification, reduces component complexity, and maintains reliable sealing by preventing axial displacement of sealing elements, thus ensuring reproducible and secure tightness.
Implementation Method 1
The coupling element (22) comprises at least one engagement hook (4, 4') which is intended for the positive engagement with the retaining rib (3) of the insert part (1)
Implementation Method 2
A sealing arrangement is inserted in the ring shaped space, the first and second ring shoulders forming axial active faces of the sealing arrangement
Data Source
AI summary
An insert coupling more preferably intended for use with fuel lines consists of a sleeve-like coupling body (2) and a tubular insert part (1) carrying a retaining rib (3) on the outside. Via a coupling element (22) axially fixed in the coupling body (2) on to which engagement hooks (4, 4′) are molded which are intended for engagement with the retaining rib (3), a ring shoulder (23) is formed at the same time which together with a ring shoulder (24) of the housing (8) of the coupling body (2) axially spaced from said ring shoulder and the radially spaced cylindrical faces of the housing (8) facing each other and the insert part (1) define a ring space (11) in which a sealing arrangement consisting of two sealing rings (5, 7) and a support ring (6) arranged in-between are accommodated. As a result of the unambiguous axial fixing of the sealing arrangement in the housing (8) the function of the sealing arrangement is not impaired through the removal of the insert part (1) from the coupling body (2) and through inserting said insert part in the coupling body (2). A simple construction of the insert coupling is obtained in that said coupling factually consists only of three substantial components plus the sealing arrangement and can be employed with insert parts (1) which are smooth-walled except for a retaining rib (3).