Fire Resistant Cabinet Sandwich Structure Weight Reduction
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Solution Overview
Problem
Existing fire protection cabinets are excessively heavy due to the use of dense water-containing mineral building boards, making them difficult to handle and assemble while providing insufficient weight reduction for the same fire resistance duration.
Innovation Solution
The fire protection cabinet employs a sandwich structure with a wood material layer inwardly and mineral-based thermal insulation panels outwardly, specifically silicate-based panels with low density and high thermal resistance, combined with a sheet steel shell, eliminating gaps and additional layers for a lighter and more manageable design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If dense water-containing mineral building boards are used for fire protection, then fire resistance duration is improved, but weight increases excessively
Solution Approach 1:
The patent changes the density parameter of the thermal insulation material from high (water-containing mineral building boards) to low (air-containing porous structures). The sandwich structure uses lightweight core materials with trapped air pockets that provide thermal insulation equivalent to much denser materials, achieving the same fire resistance duration with significantly reduced weight.
Solution Approach 2:
The patent employs a composite sandwich structure combining lightweight outer skin panels with a porous thermal insulation core. This composite construction integrates materials with complementary properties: the outer panels provide structural integrity while the porous core provides thermal insulation, achieving both fire resistance and weight reduction simultaneously.
2Reliability
If heavy massive walls are used to achieve fire resistance, then fire protection is improved, but ease of handling and assembly deteriorates
Solution Approach 1:
The patent divides the cabinet walls into segmented sandwich panels rather than using single massive blocks. Each panel is a self-contained unit with integrated insulation and structural layers, making them manageable in size and weight for single-person handling while maintaining complete fire protection when assembled together.
Solution Approach 2:
The composite sandwich panel structure provides high fire protection reliability through its multi-layer construction while keeping individual panel weights manageable. The distributed insulation architecture across multiple thin layers achieves the same thermal barrier as a single thick wall but with much improved handling characteristics.
3Duration of action of stationary object
If additional heavy insulation boards are added to increase fire resistance, then fire resistance duration is improved, but weight and device complexity increase
Solution Approach 1:
The patent merges the structural wall function and thermal insulation function into a single integrated sandwich panel structure. The insulation layers are permanently bonded between the outer skin panels, eliminating the need for separate insulation boards and reducing both weight and structural complexity while achieving extended fire resistance duration.
Solution Approach 2:
The composite sandwich structure combines structural and insulation functions in one integrated element. The multi-layer construction with bonded interfaces creates a unified component that provides both mechanical strength and thermal barrier properties, avoiding the complexity of assembling multiple separate heavy insulation boards.
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 configuration achieves a significant weight reduction of over 20% to 30% compared to conventional cabinets, allowing for easier assembly and reduced costs while maintaining high fire resistance and mechanical stability, with a fire resistance of F90 achieved without additional heavy insulation boards.
Implementation Method 1
the fire protection layer is designed as one or more thermal insulation panels on a mineral basis
Implementation Method 2
This salt or salt mixture can, for example, be designed in such a way that it melts at 30° C. and thereby absorbs a great deal of energy
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a fire-resistant cabinet, in particular a safety cabinet and preferably a hazardous materials cabinet. This cabinet is equipped with a body (1, 2, 3, 4) and with at least one door (5) connected to the body (1, 2, 3, 4). The body (1, 2, 3, 4) largely has a sandwich construction with at least one inwardly facing wood-based material layer (7) and an outwardly facing fire-resistant layer (8). According to the invention, the fire-resistant layer (8) is designed as one or more mineral-based thermal insulation panels (8).