Housing Base Plate Sealing via Inverted Capillary Flow
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Solution Overview
Problem
Meniscus formation during the sealing of electrical connections in microswitches for vehicles leads to issues such as solder bead formation and inadequate contact between connecting pins and their counterparts, which existing methods fail to adequately prevent.
Innovation Solution
Applying a sealing compound through strategically designed openings in the base plate from the inner side, utilizing capillary action to guide the compound to the interface between the pins and the base plate, minimizing meniscus formation by creating a gap that directs the compound to flow around the pins for effective sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing compound is applied to the exterior of the housing, then the interface can be sealed, but meniscus formation occurs causing solder bead formation and unreliable contact
Solution Approach 1:
The patent inverts the conventional sealing approach by applying sealing compound from the interior side of the base plate rather than from the exterior. This reversal prevents the sealing compound from forming menisci on the exterior surfaces where connecting pins make contact, thereby eliminating solder bead formation while maintaining effective sealing at the interface between the base plate and electrical connections.
Solution Approach 2:
The patent introduces conveying channels as intermediary structures within the base plate that guide the sealing compound from the interior application point to the interface regions. These channels act as controlled pathways that direct the sealing compound away from critical contact areas, preventing meniscus formation on exterior surfaces while ensuring proper sealing at the base plate interface.
2Reliability
If conveying channels or ribs are used to guide sealing compound to the interface, then sealing can be achieved, but the structure becomes more complex
Solution Approach 1:
The base plate is designed to serve multiple functions: it provides structural support, contains integrated conveying channels for sealing compound distribution, and creates sealing interfaces with electrical connections. By combining these functions into a single component, the patent achieves effective sealing without adding separate rib structures or external conveying mechanisms, thereby maintaining structural simplicity while ensuring reliable sealing.
3Reliability
If the entire base area is structured to guide sealant, then sealing can be achieved, but extremely low viscosity sealant and very small gaps are required
Solution Approach 1:
Rather than structuring the entire base area, the patent applies local quality by creating specific conveying channels only in the regions where sealing compound needs to be directed. The base plate maintains its simple flat structure in most areas, with localized channel features only where needed for sealant guidance. This approach allows use of sealants with normal viscosity ranges and accommodates standard manufacturing tolerances for gaps between components.
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 method prevents meniscus formation, ensures reliable sealing and adhesion, and allows for the use of the outer surface of the base plate for additional purposes like printing information, while maintaining consistent flow properties and viscosity of the sealing compound.
Implementation Method 1
utilizing capillary action to guide the compound to the interface between the pins and the base plate
Data Source
AI summary
A method for sealing a housing includes providing a base plate of the housing with at least one opening; providing an electrical connection that extends through the base plate from an inner side to an outer side of the base plate; and applying a sealing compound into the opening from an outer side of the base plate in order to seal an interface between the base plate and the electrical connection.