Appliance Door Corner Gap Sealing With Cured Adhesive Cavities
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Solution Overview
Problem
Existing methods for sealing gaps at the corners of appliance door panels are inefficient and do not provide a hermetic seal, leading to gas and vapor permeation into the insulating cavity.
Innovation Solution
A method involving folding metallic sheets to form structural outer panels with defined side edges and gaps, where interior and exterior blocks create adhesive cavities that are filled with a fast-curing adhesive, forming a solid sealing member that hermetically seals the gaps when the exterior blocks are removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sealing methods are used for corner gaps, then the manufacturing process is simpler, but the seal is not hermetic and allows gas and vapor permeation
Solution Approach 1:
The sealing structure is divided into multiple components: interior blocks positioned at the corner gaps, exterior blocks that form temporary adhesive cavities, and fast-curing adhesive material. This segmentation allows each component to perform its specific function - the interior blocks provide structural support, the exterior blocks create containment cavities, and the adhesive provides the hermetic seal - thereby achieving reliable hermetic sealing without requiring overly complex integrated structures.
Solution Approach 2:
The interior blocks are pre-positioned at the corner gaps before adhesive application, and the exterior blocks are temporarily placed to define the adhesive cavities. This preliminary positioning ensures that when the fast-curing adhesive is applied, it is already contained within properly formed cavities and will cure in the correct position to create the hermetic seal, eliminating the need for complex real-time adjustment mechanisms.
2Productivity
If fast-curing adhesive is used to seal gaps, then the sealing speed increases, but the process requires precise timing and temperature control
Solution Approach 1:
The adhesive cavities are pre-formed by positioning the interior and exterior blocks before adhesive application. This preliminary cavity formation ensures that when the fast-curing adhesive is applied, it is immediately contained within the pre-defined cavities, eliminating the need for complex real-time containment mechanisms and reducing process control complexity while maintaining high sealing speed.
Solution Approach 2:
The exterior blocks serve as temporary intermediary structures that define the adhesive cavities and control adhesive flow during the curing process. These intermediaries are temporarily placed to create the necessary containment structure, then removed after the adhesive cures, leaving the hermetic seal in place without requiring complex control systems.
3Manufacturing precision
If exterior blocks are used to define adhesive cavities, then the adhesive containment is improved, but additional components must be added and removed
Solution Approach 1:
The exterior blocks function as temporary intermediary structures that precisely define the adhesive cavities. They are added to the assembly, the adhesive is applied within their confines for precise containment, and then they are removed after curing. This intermediary approach achieves high adhesive placement precision while the temporary nature of the exterior blocks minimizes their impact on the final component count.
Solution Approach 2:
The exterior blocks are temporary components that are discarded after serving their purpose of defining the adhesive cavities. Once the adhesive cures and provides the hermetic seal, the exterior blocks are removed and can be recovered for reuse in subsequent sealing operations, thereby justifying their temporary addition to the process.
4Ease of manufacture
If corner gaps are sealed with adhesive, then the need for fasteners or welding is reduced, but the adhesive must be precisely contained during curing
Solution Approach 1:
The sealing process is segmented into distinct functional components: interior blocks for structural support, exterior blocks for cavity definition, and adhesive for sealing. This segmentation allows the adhesive to be precisely contained within the cavities defined by the exterior blocks, achieving the necessary manufacturing precision while maintaining the simplicity of the overall adhesive-based sealing approach without fasteners or welding.
Solution Approach 2:
The exterior blocks serve as temporary intermediary structures that provide precise containment for the adhesive during application and curing. These intermediaries create well-defined cavities that guide adhesive placement and prevent overflow, achieving high containment precision. After curing, the intermediaries are removed, leaving the simple adhesive seal in place without requiring fasteners or welding.
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 effectively seals the gaps, preventing gas and vapor permeation and creating a vacuum-insulated structure, reducing the need for additional fasteners or welding and allowing for the reuse of exterior blocks.
Implementation Method 1
An adhesive is disposed within each adhesive cavity, wherein the adhesive substantially fills each gap and is contained in the adhesive cavities by the interior and exterior blocks. The adhesive is cured to form a solid sealing member within each adhesive cavity that adheres the respective interior block to the interior surface of the structural outer panel
Data Source
AI summary
A method of forming an insulated door panel includes folding side flanges of a metallic sheet to define side edges of a structural outer panel that extend from a front panel. A gap is defined between each set of adjacent side edges. Interior blocks are secured to an interior of the structural outer panel proximate each gap to define adhesive cavities. Exterior blocks are positioned at an exterior surface of the structural outer panel at each gap to further define the adhesive cavities. An adhesive is disposed within each adhesive cavity and is contained therein by the interior and exterior blocks. The adhesive is cured to a solid sealing member that adheres the interior blocks to the interior surface of the structural outer panel to form a sealed structural panel. The exterior blocks are removed and each solid sealing member defines a hermetic seal at each gap.