Sensor-Activated Ventilation Closure for Electrical Distributors

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Solution Overview

Problem

Existing fire protection systems for electrical distributors fail to maintain functionality during fires due to late activation of thermally activatable sealing materials, allowing harmful gases and smoke to penetrate and impair the electrical components, which can lead to early failure of safety-relevant devices.

Innovation Solution

A housing with sensors, a control unit, and an electrically activatable closure element that can reduce ventilation openings and switch off technical ventilation early in the event of a fire, preventing harmful gases and excessive temperatures from entering the housing, thereby maintaining the functionality of safety-relevant facilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thermally insulating housing is used to protect electrical distributor from fire, then fire protection is improved, but heat dissipation capability deteriorates

Engineering Contradiction:

Improvefire protectionVSAvoidheat dissipation

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The housing transitions from a static thermal insulator to a dynamic system with movable closure elements that can open or close ventilation openings based on fire detection, allowing the heat dissipation characteristics to change dynamically between normal operation and fire protection modes

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Ventilation openings are pre-configured in the housing structure with closure elements ready to activate, and fire detection sensors are pre-positioned to trigger the closure mechanism before harmful fire conditions fully develop

Inventive Principle:

Principle #10Preliminary action

2Reliability

If thermally activatable sealing materials are used to close ventilation openings, then fire protection is improved, but activation timing deteriorates

Engineering Contradiction:

Improvesealing effectivenessVSAvoidactivation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The passive thermal activation mechanism is replaced with an active sensor-based detection and control system that uses electrical or electronic signals to trigger closure elements, substituting mechanical/thermal response with a more responsive sensor-controlled mechanism

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Fire detection sensors continuously monitor conditions and trigger closure elements before fire conditions reach the activation temperature of thermally activatable materials, performing the sealing action in advance of what passive materials could achieve

Inventive Principle:

Principle #10Preliminary action

3Temperature

If ventilation openings remain open for heat dissipation, then cooling capability is improved, but harmful gas penetration deteriorates

Engineering Contradiction:

Improvecooling capabilityVSAvoidharmful gas ingress

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The ventilation openings transition from a permanently open state to a dynamic configuration where closure elements can adjust or close the openings based on detected fire conditions, allowing the system to adapt between maximum cooling and maximum protection states

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Closure elements act as intermediary components between the ventilation openings and the external environment, controlling the flow of air and blocking harmful substances based on fire detection signals

Inventive Principle:

Principle #24Intermediary (Mediator)

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 system effectively extends the operational time of electrical distributors by preventing harmful ingress and maintaining the functionality of safety-relevant devices during fires, ensuring compliance with fire protection regulations for critical applications.

Implementation Method 1

an additional (e.g. electrical) measurement signal emitting sensor, a control unit and an electrically activatable closure element

Methodology Applied

Scientific EffectSensor detection:

Implementation Method 2

thermally activatable sealing materials, which flake or swell above a certain temperature and thus lead to an insulating closure of the ventilation opening

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 3

an electrically activatable closure element for closing ventilation openings and/or to switch off the technical ventilation

Methodology Applied

Scientific EffectElectrical activation:

Data Source

PatentEP1848077B2Fire protection for electrical distributor

Publication Date: 2016.06.15 EATON SAFETY IP

Figure 1
Figure 2~4

AI summary

The present invention relates to a housing (1), in particular a housing for a fire-resistant electrical distribution box, with at least one ventilation opening (6) for ventilating the housing (1), wherein a thermally activated seal (14) is provided for sealing the housing (1) in the event of a fire. The invention is characterized in that a sensor (S) emitting a measurement signal is provided for detecting a measured value, and that an electrically activated closing element (8) and a control unit (13) are also provided. By means of the control unit (13), the closing element (8) can be activated to close the ventilation opening (6) and/or to switch off a fan (7) provided for technical ventilation when the measured value exceeds a predetermined threshold. The invention also relates to a corresponding method.