Service Port Cap with Click Lock and Vent Slot
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Solution Overview
Problem
Service port caps for automotive air conditioning systems are prone to being blown off by refrigerant leaks, leading to uncontrolled refrigerant and lubricant spewing into the engine compartment, posing a hazard and risk of damage.
Innovation Solution
A service port cap design featuring an interior wall with an annular groove and a rubberized plug that snaps onto the service port, with an axially extending vent slot to direct leaking refrigerant safely out of the cap, and an optional locking ring to secure the cap in place, preventing blow-off and ensuring controlled leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional service port cap is used to protect the service port, then the service port is protected from dirt and contaminants, but the cap can be blown off by refrigerant pressure during a leak, causing uncontrolled spewing of refrigerant and lubricant into the engine compartment
Solution Approach 1:
The cap is divided into a body portion and a separate locking ring component. The locking ring segments the retention function from the sealing function, allowing the cap body to maintain pressure sealing while the locking ring prevents blow-off during leaks.
Solution Approach 2:
The locking ring is installed beforehand to preemptively counteract the harmful effect of cap blow-off. By establishing a mechanical lock before refrigerant leakage occurs, the system prevents the cap from being blown off during pressure events.
Solution Approach 3:
The locking ring acts as an intermediary mechanism between the cap and the service port. It provides an additional retention interface that mediates the connection, preventing direct blow-off while allowing the original cap sealing function to operate.
2Reliability
If the cap is designed to seal tightly to prevent refrigerant leakage, then sealing effectiveness is improved, but the cap becomes more susceptible to being blown off by pressure buildup during a leak
Solution Approach 1:
The retention function is segmented from the sealing function by introducing a separate locking ring. This allows the cap body to be optimized for sealing while the locking ring provides independent mechanical retention strength against blow-off forces.
Solution Approach 2:
The system combines two different retention mechanisms: the original friction-fit sealing interface and the additional mechanical locking interface. This composite retention approach provides both tight sealing and high resistance to blow-off.
3Strength
If a pop-off valve structure is added to the cap to release pressure before cap blow-off, then cap blow-off is prevented, but the escaping refrigerant is directed toward other sensitive components in the engine compartment
Solution Approach 1:
The harmful function of the pop-off valve (directing refrigerant toward sensitive components) is extracted and replaced. Instead of using a pop-off valve that vents refrigerant internally, the solution uses a locking ring that prevents blow-off entirely, eliminating the need for internal venting that could direct refrigerant harmfully.
Solution Approach 2:
The high pressure refrigerant leak, which would normally cause cap blow-off or harmful internal venting, is converted into a controlled scenario where the locking ring maintains cap retention. The pressure buildup is contained without creating harmful discharge paths.
4Strength
If a locking ring is added to secure the cap in place, then resistance to blow-off is improved, but device complexity increases
Solution Approach 1:
The locking ring provides dynamic retention that adapts to pressure conditions. It maintains a simple friction-fit relationship during normal operation but engages mechanically to prevent blow-off during high-pressure events, providing adaptive protection without complex mechanisms.
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 cap effectively prevents blow-off and contains refrigerant and lubricant leaks, directing them safely out of the cap, thereby protecting the engine compartment from uncontrolled spills and ensuring the cap remains securely attached even under high pressures.
Implementation Method 1
A rubberized plug is disposed in the interior top of the cap
Implementation Method 2
at least one axially extending vent slot is formed in the side of the cap... the leaking refrigerant is directed safely along the interior wall of the cap and escapes through the vent slot on the side of the vent cap
Implementation Method 3
an annular groove in the interior wall sized and positioned to snap onto the outwardly projecting annular flange of the service port
Data Source
AI summary
A service port cap has a body configured to be snapped onto a service port such as an automotive air conditioning service port. The cap has an axial slot allowing the body to spread as it is pressed onto the service port. A rubberized plug in the top of the cap bears and seals against the end of the service port. Should a fluid leak develop through the service port, the rubberized plug maintains a seal until the pressure is sufficient to overcome the seal created by the plug. At this point, the leaking fluid is directed out through the axial slot in the cap. Thus, the cap does not blow off and the flow of leaking fluid is controlled so that it does not spew. One embodiment includes a locking ring that slides to a locking position to lock the cap onto a service or other port to form a fixed seal.