Self-heating assembly with distributed reactant
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Solution Overview
Problem
Existing self-heating assemblies face challenges in maintaining uniform heating of products during shipping and handling due to the displacement of granular reactants, leading to inconsistent heating results.
Innovation Solution
A self-heating assembly design featuring a product container and a heater container with a reaction space, a support structure made of open cell foam, and a frangible membrane separating the liquid and granular reactants, ensuring uniform distribution and contact for even heating across the product tray.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If granular reactant is placed in reaction space without support structure, then device complexity is reduced, but granular reactant displacement occurs during shipping and handling leading to non-uniform heating
Solution Approach 1:
The patent employs an open cell foam support structure that utilizes its porous architecture to hold granular reactant in place. The foam's cellular structure provides numerous small cavities and surfaces that trap and secure the granular material, preventing displacement during shipping and handling while maintaining relatively simple device construction.
2Reliability
If frangible membrane separates reactants, then reliability of reactant distribution is improved, but device complexity increases due to additional components
Solution Approach 1:
The frangible membrane is pre-positioned within the reaction space to establish the correct reactant distribution configuration before use. This preliminary arrangement ensures that when the membrane breaks upon activation, the liquid and granular reactants are already positioned for optimal contact and uniform reaction, eliminating the need for complex real-time control mechanisms.
3Reliability
If granular reactant is distributed throughout support structure, then heating uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The open cell foam support structure provides a three-dimensional network of cells and surfaces that naturally distribute granular reactant throughout its volume. The porous architecture creates numerous retention points that hold granular material in a dispersed, uniform pattern without requiring precise manual placement or complex distribution mechanisms during assembly.
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 assembly ensures reliable and uniform heating of products by maintaining the granular reactant's distribution within the support structure, even when jostled, and achieves consistent temperature increase across the product tray.
Implementation Method 1
The liquid first reactant and the granular second reactant are adapted to exothermically react upon contact with one another
Implementation Method 2
The support structure is permeable to the liquid first reactant and is configured to support and substantially maintain the distribution of the granular second reactant throughout the support structure
Data Source
AI summary
A self-heating assembly includes a product container for holding a product to be heated and a heater container coupled to the product container. There is a reaction space between the product container and the heater container. There is a support structure (made, for example, of open cell foam) in the reaction space and a granular second reactant distributed throughout the support structure. There is a liquid first reactant in the reaction space. A frangible membrane is configured so that, when intact, it separates the liquid first reactant from the support structure and from the granular second reactant. The liquid first reactant and the granular second reactant are adapted to exothermically react upon contact with one another. The support structure is permeable to the liquid first reactant and is configured to support and substantially maintain the distribution of the granular second reactant throughout the support structure before and during the exothermic chemical reaction.