Structural cabinet for an appliance
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Solution Overview
Problem
Conventional vacuum insulated structures in appliances experience inward deflection due to the inward compressive force generated by the vacuum, leading to undesirable aesthetic changes in the cabinet's outer surface.
Innovation Solution
A multi-layer insulation system comprising an outer wrapper and an inner liner with first and second insulating structural layers made of glass spheres adhered with adhesive, which resist deflection by containing the core insulating material and maintaining the cabinet's shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a vacuum insulated structure is used in a cabinet, then thermal insulation performance is improved, but the cabinet experiences inward deflection due to vacuum compressive force
Solution Approach 1:
The cabinet wall is segmented into multiple functional layers: outer wrapper, first insulating structural layer, core insulating material, second insulating structural layer, and inner liner. This segmentation allows each layer to perform its specific function - the structural layers provide mechanical support against vacuum pressure while the core material provides thermal insulation.
Solution Approach 2:
The patent employs composite material structures where glass sphere-based insulating structural layers are combined with core insulating material (such as foam or aerogel). This composite approach creates a multi-functional wall assembly that simultaneously provides both structural integrity to resist vacuum compressive force and effective thermal insulation.
2Strength
If glass sphere layers are added to reinforce the cabinet, then structural strength is improved, but device complexity increases
Solution Approach 1:
The glass sphere-based insulating structural layers serve multiple functions simultaneously: they provide structural reinforcement to resist vacuum pressure, contribute to thermal insulation performance, and maintain cabinet shape. This multi-functionality reduces the need for separate structural support components, thereby managing complexity while achieving multiple objectives.
Solution Approach 2:
The patent merges the structural support function and thermal insulation function into a single integrated wall assembly. The glass sphere layers are not merely additive structural elements but are integrated with the core insulating material to form a unified multi-layer system that achieves both mechanical and thermal performance in one construction.
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 system effectively prevents deflection and maintains the cabinet's aesthetic by reinforcing the outer wrapper and inner liner, ensuring a consistent shape during and after vacuum generation.
Implementation Method 1
A plurality of glass spheres are adhered with an adhesive to an inner surface of an outer wrapper and an inward surface of an inner liner
Implementation Method 2
an inward compressive force generated by the vacuum
Implementation Method 3
inward compressive force generated by the vacuum
Data Source
Figure 1
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AI summary
A structural cabinet for an appliance includes an outer wrapper and an inner liner defining an insulating cavity therebetween. A first insulating structural layer is disposed against an inner surface of the outer wrapper. A second insulating structural layer is disposed against the inward surface of the inner liner. A core insulating material is disposed between the first and second structural insulating layers, wherein the first and second insulating structural layers reinforce the outer wrapper and inner liner, respectively, and resist deflection when the core insulating material is in a compressed state within the insulating cavity.