Dry-Blown Mineral Wool Insulation for 3D Oven Cavities
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Solution Overview
Problem
Existing insulation methods for three-dimensional appliances, such as domestic ovens, are complex, time-consuming, and prone to heat losses due to difficulties in shaping mineral wool insulating materials around irregular surfaces and cavities, often requiring manual handling and binders that can emit hazardous gases or create thermal bridges.
Innovation Solution
A process involving the dry blowing of mineral wool flakes or nodules into cavities without added binders or water, using a gas stream to form a dense insulating layer that adapts to complex shapes, eliminating the need for manual handling and subsequent drying, and allowing for higher densities and improved thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mineral wool batts are cut and manually installed around the chamber, then the insulation can be applied to three-dimensional surfaces, but the installation process becomes complex and time-consuming
Solution Approach 1:
The patent uses a pneumatic blowing process to inject mineral wool flakes into the insulation cavity. Compressed air carries the flaked mineral wool material through nozzles and distributes it uniformly within the cavity, eliminating manual handling and significantly reducing installation time while maintaining proper insulation application.
Solution Approach 2:
The patent changes the physical form of the insulation material from pre-cut batts to flaked material that can be transported and deposited pneumatically. This parameter change in material form enables automated application processes and reduces installation complexity.
2Reliability
If mineral wool is sprayed with binder and water, then the insulation layer can be formed, but dust fly-off occurs and workstation cleaning becomes problematic
Solution Approach 1:
The patent applies binder to the mineral wool flakes in advance during the flaking process, before the insulation application. This preliminary binding action prevents dust fly-off during the pneumatic transport and deposition process, eliminating the need for workstation cleaning while ensuring proper insulation layer formation.
3Strength
If insulating materials are impregnated with organic binders, then the mechanical integrity of the insulating coating is ensured, but gaseous emissions occur at high temperatures
Solution Approach 1:
The patent changes the binder type from organic to inorganic (such as silicate-based binders). This parameter change in binder chemistry eliminates gaseous emissions at high temperatures while maintaining the mechanical integrity of the insulation coating through the inorganic binder's binding properties.
4Strength
If needle-punched products are used for insulation, then the mechanical strength is improved, but thermal bridges are created due to the rigid structure
Solution Approach 1:
The patent uses flaked mineral wool material that can be deposited with varying local densities. The material naturally adapts to cavity shapes and creates uniform insulation without rigid structures, eliminating thermal bridges while providing adequate mechanical strength through proper density distribution and cavity sealing.
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 simplifies the insulation process, reduces heat losses, enhances energy efficiency, and eliminates risks associated with binder emissions, achieving higher insulation densities and improved thermal performance without the need for additional binding agents or drying steps.
Implementation Method 1
flakes and/or nodules of wool(s) and/or fibers, in particular mineral wool(s) and/or fibers, are blown (in a gas stream) into said space(s) to be insulated
Implementation Method 2
to prevent heat losses to the outside of the chamber and to improve the energy performance of the oven
Data Source
AI summary
A process is for insulating an appliance, in particular a three-dimensional appliance likely in particular to be exposed to high temperatures, such as a domestic oven. The appliance has one or more internal spaces to be insulated. Flakes and/or nodules of wool(s) and/or fibers, in particular mineral wool(s) and/or fibers, are blown into the space(s) to be insulated without adding binder or water.