Multi-Walled Transparent Access Door for Insulated Cooling Displays
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Solution Overview
Problem
Existing cooling devices with transparent access doors face challenges in maintaining effective insulation and structural integrity while minimizing material usage and weight, leading to high energy consumption and environmental impact due to free air exchange and potential damage from temperature fluctuations.
Innovation Solution
A multi-walled construction access door with a plate-shaped first wall and a plane-parallel second wall, featuring a cavity and offset central part, made of lightweight plastics like PMMA, provides stiffness, insulation, and reduced condensation, while maintaining visibility and structural integrity through a transparent adhesive and optional ventilation and LED lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick glass plate is used for the access door to ensure sufficient strength, then structural integrity is improved, but weight increases making it impractical
Solution Approach 1:
The patent employs a composite structure consisting of two plastic plates (first and second walls) bonded together with adhesive to form a multi-walled construction. This composite approach provides sufficient structural strength while maintaining lightweight properties, as plastic materials have lower density compared to glass, thereby resolving the contradiction between strength and weight.
Solution Approach 2:
The invention creates a nested structure where two plates are bonded together with adhesive layers in between, forming a multi-layered construction. This nested arrangement enhances structural integrity through the distributed bonding interfaces while keeping each individual plate thin and lightweight, thus achieving both strength and low weight requirements.
2Stability of the object's composition
If a thick plastic plate is used for the access door to prevent deformation, then stiffness is improved, but weight increases substantially
Solution Approach 1:
The patent uses a composite construction of two plastic plates bonded with adhesive, creating a multi-walled structure that provides enhanced stiffness through the distributed bonding interfaces and cavity formation. This allows each individual plate to remain thin and lightweight while the composite structure as a whole achieves the required stiffness to prevent deformation.
Solution Approach 2:
The invention transitions from a single-plane thick plate to a multi-dimensional multi-walled construction with cavities formed between bonded plates. This dimensional change allows the structure to achieve higher stiffness-to-weight ratio by distributing mechanical loads across multiple interfaces and utilizing the cavity structure for structural reinforcement without increasing material thickness.
3Ease of manufacture
If a single-walled construction is used for the access door, then manufacturing is simpler, but insulation performance deteriorates leading to higher energy consumption
Solution Approach 1:
The patent employs a composite multi-walled construction with adhesive bonding between plates, creating insulating cavities that reduce thermal transfer. While the manufacturing process involves additional bonding steps compared to single-walled structures, the use of standard adhesive techniques keeps the process relatively simple while achieving significant insulation performance improvements that reduce cooling energy consumption.
4Loss of energy
If a multi-walled construction with cavity is used for the access door, then insulation performance is improved, but device complexity increases
Solution Approach 1:
The patent implements a multi-walled composite construction with adhesive bonding that creates insulating cavities. This approach improves insulation performance by introducing air gaps between plates that reduce thermal conduction. The complexity is managed by using standard adhesive bonding processes and maintaining a regular plate structure, making the increased complexity acceptable given the energy savings.
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 results in a lightweight, energy-efficient access door with reduced material usage, minimized condensation, and enhanced visibility, lowering energy costs and environmental impact while maintaining structural integrity and aesthetic appeal.
Implementation Method 1
due to the presence of the cavity also insulates well and reduces condensation on the transparent access door
Data Source
AI summary
An access door for use in a cooling device for keeping products chilled and displaying them, in particular food and/or beverages, wherein the access door is substantially transparent and includes a first wall and a second wall parallel to each other, made of plastic, and joined at the edges to form a cavity between the walls.