Fluid Line Coupling Locking Arm for Accidental Separation Prevention
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Solution Overview
Problem
Conventional cam-and-groove couplings for fluid lines are prone to accidental separation due to low friction retention, leading to potential fluid spillage and safety risks, especially under residual fluid pressure or when the lines are inclined.
Innovation Solution
The coupling device features a female and male part with a locking arm mechanism that includes a cam and safety stop, preventing accidental separation by ensuring the cam cannot lock while aligned with the safety stop, and allowing secure engagement and disengagement based on rotational positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the locking arm is designed to be rotatable between locked and unlocked positions, then the coupling device allows easy assembly and disassembly, but the male part may accidentally withdraw from the female part due to low friction retention
Solution Approach 1:
The locking arm is designed with different functional zones: a cam portion that engages the groove for secure locking, and a body portion that interfaces with the female part. The cam portion provides high friction and mechanical engagement for reliability, while the rotatable joint provides ease of operation. This local differentiation of qualities resolves the contradiction between easy operation and secure retention.
Solution Approach 2:
The locking arm transitions from a static retention mechanism to a dynamic one that can be actively rotated between locked and unlocked positions. The cam-and-groove interface provides dynamic locking where the cam can be rotated into engagement with the groove for secure retention, or rotated out for easy disassembly, while maintaining positive mechanical engagement in both states.
2Reliability
If the cam protrudes through the aperture to lock the male part, then the coupling is secure, but the male part cannot be accidentally separated when the cam is aligned with the channel
Solution Approach 1:
The groove is designed with an asymmetric cross-section that is wider at the bottom than at the top, creating a tapered engagement. The cam engages this asymmetric groove such that when rotated into the locked position, it wedges tightly against the wider bottom portion, providing secure locking. When aligned with the channel, the asymmetric geometry allows the cam to be positioned where it cannot engage the groove, preventing accidental locking while maintaining retention through the female part's internal friction.
3Device complexity
If the retention relies on friction between male and female parts, then the structure is simple, but the friction is insufficient to prevent separation under pressure or inclination
Solution Approach 1:
The locking arm is pre-positioned in a default locked state where the cam engages the groove, providing immediate retention strength upon assembly. This preliminary locking action eliminates the need for complex additional retention mechanisms while ensuring sufficient friction and mechanical engagement to prevent separation under pressure or inclination, maintaining both structural simplicity and high reliability.
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 design effectively prevents accidental separation of fluid lines, reducing the risk of fluid spillage and ensuring safer operation under various conditions, including pressure and inclination.
Implementation Method 1
the cam in either the locked or unlocked position engages the male cylindrical annular wall within the groove to retain the male mating end in the female mating end
Implementation Method 2
the at least one locking arm cannot be rotated to the locked position when the cam is aligned with the safety stop
Data Source
AI summary
A coupling device for fluid lines includes a female part having an annular wall with an aperture, a locking arm with a cam, and a male part having an annular wall with an outside surface with a circumferential groove and defining a longitudinal channel extending into the groove. The male part can be inserted into and rotated within the female part. The locking arm has a cam, and can be rotated between a locked position in which the cam is in a locked position and an unlocked position in which the cam is in an unlocked position. When the cam is in either the locked or unlocked position, the cam engages the groove to retain the male part within the female part, unless the male part is rotationally positioned relative to the female part such that cam is aligned with the channel, in which case the male part is releasable from the female part.