Compressed Air Coupling Safety via Nested Protective Collar
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Solution Overview
Problem
Existing designs for compressed air couplings with short neck Asian standard nipples fail to achieve safety features like intermediate pressure relief and protective collars due to space constraints, leading to potential injury and damage from residual pressure and accidental decoupling.
Innovation Solution
A female hose coupling-half with a spring-loaded sleeve and pawls that engage in a see-saw action, providing a protective collar and allowing for intermediate pressure relief before complete disengagement, while maintaining strength and wear resistance within the limited space of Asian standard couplings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective collar completely covering the sleeve end is added to prevent accidental decoupling, then safety against inadvertent pulling is improved, but the coupling length increases beyond what is available with Asian standard short neck nipples
Solution Approach 1:
The protective collar is positioned inside the cylindrical socket of the valve body, nesting it within the existing coupling structure. This allows the collar to provide protective function without increasing the overall coupling length, as it utilizes the internal space already available in the Asian standard design.
Solution Approach 2:
Instead of extending the protective collar axially beyond the sleeve end (one dimension), the collar is positioned radially inside the socket, utilizing the radial dimension. This dimensional shift allows protection without increasing the coupling's external length.
2Reliability
If intermediate holding stage mechanisms are added to release residual pressure before full separation, then safety against residual pressure injury is improved, but the coupling complexity and length increase
Solution Approach 1:
The intermediate holding function is merged with the existing pawl and spring mechanism. The pawl engages with a shoulder on the nipple to provide the intermediate holding stage, combining the safety function with the existing mechanical components rather than adding separate complex mechanisms.
Solution Approach 2:
The pawl element serves multiple functions: it provides the intermediate holding stage for pressure relief, maintains the locked position during coupling, and works with the spring to control the decoupling sequence. This multi-functionality reduces overall system complexity.
3Ease of manufacture
If the coupling design is simplified for easier manufacture, then manufacturing ease is improved, but the strength and wear resistance of the short coupling deteriorate
Solution Approach 1:
The valve body is provided with a cylindrical socket with specific dimensional tolerances and surface finish requirements localized to the sealing and engagement areas. This concentrates manufacturing precision requirements only where needed for strength and wear resistance, rather than requiring high precision throughout the entire coupling.
Solution Approach 2:
The coupling utilizes a valve body material that combines strength and wear resistance properties, such as a metal alloy or composite material that provides both structural integrity and resistance to mechanical wear in the high-stress areas of the short coupling design.
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 effectively prevents accidental decoupling and residual pressure-related injuries by ensuring safe pressure relief and maintaining structural integrity, even when the hose is pulled across obstacles, while being compatible with short neck Asian standard nipples.
Implementation Method 1
a spring loaded sleeve, which can be retracted to decouple the two parts
Data Source
AI summary
A female coupling-half has two pawls (7) each with a distal detent (8), to engage the nipple (3) circumferential groove, and a proximal rounded detent (15), which can lodge in either a rest closed position (16) for a closed valve (2) or a valve-open position (17). The inserted nipple (3) moves the valve (2) which brings with it the pawls (7) via central projections (13) thereon and the manual sleeve (10) until the proximal rounded detent (15) lodges in its valve-open position (17). Retraction of the sleeve (10) for release holds the nipple (3) in an intermediate pressure relief position until ejection pressure is no longer exerted on the nipple (3) and the sleeve (10) is allowed to spring out to its fully extended position completely releasing the nipple (3).