Cooling System Filling Adapter Venting for ATEX Gas Containment
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Solution Overview
Problem
Service equipment for handling inflammable coolants and their mixtures with oil poses safety risks, necessitating compliance with the ATEX Directive, which requires safety zones to manage inflammable agents effectively.
Innovation Solution
An adapter with gripping claws activated by an actuator, ventilation for inflammable gases, and a pneumatic system for pressure and vacuum testing ensures the inflammable Zone 2 area is restricted, maintaining a non-dangerous area around the adapter, and includes a heating member to prevent condensation and minimize residual medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If service equipment is used for handling inflammable coolants, then the equipment can service cooling systems with inflammable substances, but safety zones must be established around the equipment to manage inflammable agents
Solution Approach 1:
The adapter is divided into distinct functional zones: a Zone 2 area inside the adapter body where inflammable gases may occur, and a Zone 0 area around the coupling means where no inflammable atmosphere is present. This spatial segmentation allows the equipment to handle inflammable coolants while restricting the safety zone to only the necessary internal volume, minimizing external safety requirements.
Solution Approach 2:
The adapter acts as an intermediary component between the filling/stub equipment and the cooling system. It provides a sealed transition zone that contains any potential inflammable atmosphere within its boundaries, preventing the spread of harmful factors to the surrounding area while enabling safe handling of inflammable coolants.
2Reliability
If coupling means with gripping claws are used to connect the adapter to the filling stub, then a secure connection is achieved, but the coupling must be completely tight to prevent inflammable gases from escaping to the surroundings
Solution Approach 1:
A non-return valve is installed in the supply hose before the coupling point, positioned upstream to prevent backflow of inflammable gases. This preliminary protective measure ensures that even if the coupling were to fail, gases cannot escape to the surroundings, providing redundant safety against leakage.
Solution Approach 2:
The coupling mechanism incorporates a gasket that provides tactile and visual feedback during engagement. As the gripping claws close onto the filling stub, the gasket compresses to create a seal, providing feedback that confirms proper connection and sealing, ensuring the coupling is tight enough to prevent gas escape.
3Object-affected harmful factors
If ventilation of the area inside the adapter is provided, then inflammable gases are managed within the Zone 2 area, but the area around the adapter must be maintained as non-inflammable
Solution Approach 1:
The ventilation system extracts and removes inflammable gases from inside the adapter through a dedicated ventilation line connected to the exterior. By taking out the harmful gases through this separate extraction path, the system manages inflammable atmospheres within Zone 2 while maintaining the surrounding area as non-inflammable, without requiring complex active ventilation equipment.
4Ease of manufacture
If a heating member is provided in the coupling to counteract condensation, then the coupling remains clear of condensate, but the medium may change from liquid to gas phase causing expansion and residual medium to escape
Solution Approach 1:
The heating member intentionally induces a phase transition of the coolant from liquid to gas within the coupling. This controlled vaporization causes the medium to expand and be pushed out of the coupling, ensuring that minimal residual medium remains. The phase change is used as a mechanism to actively expel residuals rather than merely preventing condensation.
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 restricts the inflammable area, ensuring a non-inflammable zone around the adapter, maintains tightness through pressure and vacuum testing, and minimizes residual medium escape, thus adhering to ATEX Directive requirements and ensuring safe handling of inflammable coolants.
Implementation Method 1
the gasket is affected by means of a spring pressure which subjects the gasket to axial pressure
Implementation Method 2
whose spring is compressed by the pneumatic actuator
Implementation Method 3
the coupling, as stated in claim 7, is provided with a heating member, said heating member counteracting condensation in the coupling itself, but it is ensured at the same time that the medium enters into a gas phase
Implementation Method 4
When, as stated in claim 3, the tightness of the system is tested by a pressure test and a subsequent vacuum test
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
When, according to the invention, a filling adapter (1) is configured with ventilation of the so-called Zone 2 area inside the adapter, in which inflammable gases may occur, the adapter will satisfy the requirements in the ATEX (Atmosphere Explosible) Directive relating to inflammable media. Moreover, the tightness may be controlled in that the adapter is subjected to pressure and is also evacuated. Inflammable gases, if any, will be detected in connection with the exhaustion, so that the adapter is safe to use in connection with the adding of inflammable media to cooling systems.