Fire-Protection Composite for Thin-Wall Device Containers

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Solution Overview

Problem

Conventional fire protection materials for device containers require significant thickness to achieve high thermal insulation and fire protection, which is space-consuming, especially in mobile applications where space-saving solutions are essential.

Innovation Solution

A composite fire protection material comprising an insulating layer with a heat-expanding intumescent material, a cooling ablative layer that releases water upon heating, and an absorbent layer to manage water evaporation, arranged to maintain a compact thickness while providing effective thermal insulation and fire resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional fire-resistant materials are used to achieve high thermal insulation and fire protection, then fire resistance is improved, but thickness increases and space is consumed

Engineering Contradiction:
Improvefire resistanceVSAvoidthickness
Core Design Contradiction:
ReliabilityVSLength of stationary object

Solution Approach 1:

The patent applies parameter changes by using intumescent materials that undergo dramatic volume expansion (parameter change) when exposed to heat. The insulating layer former is a material that foams up under heat influence, increasing in volume and decreasing in density to form a thick, insulating foam layer that provides fire protection without requiring a thick initial material layer.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent utilizes phase transitions in two key ways: (1) The insulating layer former undergoes a phase transition from a compact state to a foamed expanded state when heated, creating thermal insulation. (2) The ablative fire protection material binds and releases water through phase change, absorbing heat energy during the process to provide active cooling and enhance fire resistance.

Inventive Principle:
Principle #36Phase transitions

2Volume of stationary object

If the thickness of fire protection material is reduced to save space, then space usage is improved, but thermal insulation and fire protection effectiveness deteriorate

Engineering Contradiction:
Improvespace usageVSAvoidthermal insulation
Core Design Contradiction:
Volume of stationary objectVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-positioning the insulating layer former and ablative fire protection material in a compact state before fire exposure. These materials are prepared in advance to undergo specific reactions when heated - the insulating layer former is ready to foam up and the ablative material is ready to release bound water, ensuring immediate and effective fire protection response without requiring thick pre-installed material.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent uses parameter changes to achieve thin-profile fire protection. The insulating layer former transforms from a dense compact form to an expanded foam structure with increased volume and reduced density upon heating. Simultaneously, the ablative material undergoes parameter changes by releasing bound water, creating a cooling effect that enhances fire resistance without requiring excessive material thickness.

Inventive Principle:
Principle #35Parameter changes

3Length of stationary object

If intumescent material is used to reduce thickness, then thickness is reduced, but additional layers (cooling and absorbent) are required to maintain effectiveness

Engineering Contradiction:
ImprovethicknessVSAvoidnumber of layers
Core Design Contradiction:
Length of stationary objectVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the fire protection system into three distinct functional layers: (1) an insulating layer with intumescent material for thermal insulation, (2) a cooling layer with ablative fire protection material for active cooling through water release, and (3) an absorbent layer to manage the released water. This segmentation allows each layer to perform its specific function efficiently while maintaining a compact overall structure.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent employs composite materials by combining different functional materials into a multi-layer fire protection composite. The insulating layer uses intumescent materials that foam upon heating, the cooling layer uses ablative materials with bound water, and the absorbent layer uses water-absorbing materials. This composite structure integrates multiple protection mechanisms (thermal insulation, active cooling, and moisture management) in a space-efficient manner.

Inventive Principle:
Principle #40Composite materials

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 composite material achieves a balance of thermal insulation and fire resistance with a reduced thickness, effectively protecting against heat and fire while minimizing space usage, with the intumescent layer providing thermal insulation, the ablative layer offering cooling through water release, and the absorbent layer managing water evaporation for enhanced cooling.

Implementation Method 1

an insulating layer that has an insulating layer former which is a material that foams up under the influence of heat

Methodology Applied
Scientific EffectIntumescent foaming: Intumescent Materials

Implementation Method 2

The intumescent material is a foaming material when exposed to heat. This means that the intumescent material increases in volume when heated. It also means that the intumescent material decreases in density when heated.

Methodology Applied
Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 3

the ablative fire protection material binds water. Advantageously, the ablative fire protection material is formulated as a hydrate in which water is bound... the ablative fire protection material, in particular the hydrate, releases water when exposed to heat. This means that the ablative fire protection material, in particular the hydrate, advantageously releases water when exposed to heat. During this water release, the hydrate can be converted into an anhydrate.

Methodology Applied
Scientific EffectEndothermic decomposition: Endothermic Reaction

Implementation Method 4

Furthermore, the water released by the ablative fire protection material can evaporate and/or vaporize. Advantageously, energy is consumed during evaporation or vaporization. In this way, a further cooling effect can be achieved.

Methodology Applied
Scientific EffectEvaporation cooling: Evaporation

Implementation Method 5

an absorbent layer which can absorb water which is released from the ablative fire protection material

Methodology Applied
Scientific EffectCapillary absorption: Capillary Action

Implementation Method 6

In particular, cavities can form within the insulating layer during foaming under the influence of heat, also known as swelling under the influence of heat. These cavities are preferably gas-filled. The foamed insulating layer primarily acts as a thermal insulator.

Methodology Applied
Scientific EffectThermal insulation through gas trapping: Thermal Insulation

Data Source

PatentEP3733396B1Device container, fire-protection material composite for a device container and use of the fire protection material composite
Publication Date: 2022.11.16 SIEMENS MOBILITY GMBH
  • EP3733396B1 patent drawing

AI summary

The invention relates to a fire-resistant material composite (6) for a device container (2). To achieve a particularly effective fire-resistant material composite (6), it is proposed that the fire-resistant material composite (6) for a device container (2) comprises an insulating layer (8) having an intumescent layer (10). It is further proposed that the fire-resistant material composite (6) comprises a cooling layer (16) having an ablative fire-resistant material (18) and an absorbent layer (24).