Explosion-Proof Exit Sign With Dual-Chamber Housing And LED Backup
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Solution Overview
Problem
Existing explosion-proof exit signs require periodic lamp replacement, lack an integral battery backup, and do not provide adequate illumination during power outages, compromising safety and increasing construction costs in hazardous locations.
Innovation Solution
An explosion-proof exit sign design featuring a dual-chamber housing with light emitting diodes (LEDs) and a rechargeable battery backup, integrated within an explosion-proof housing that includes a vent path and heat sink to manage internal explosions, and adjustable floodlights for enhanced illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If traditional incandescent lamps are used in explosion-proof exit signs, then the signs can be manufactured with simpler housing requirements, but the lamps require periodic replacement and have shorter lifespan
Solution Approach 1:
The patent replaces traditional incandescent lamps with light-emitting diodes (LEDs), which are solid-state devices that do not have filament burnout issues. This substitution eliminates the need for periodic lamp replacement while providing extended operational lifespan, directly resolving the contradiction between durability and maintenance requirements.
2Reliability
If external redundant power sources are required for exit signs, then power backup during outages is ensured, but construction costs increase
Solution Approach 1:
The patent integrates a rechargeable battery and charging circuit directly into the exit sign housing, combining the backup power source and charging functionality into a single unified device. This eliminates the need for separate external power sources and complex wiring infrastructure, thereby reducing construction costs while maintaining reliable power backup capability during outages.
Solution Approach 2:
The exit sign incorporates an automatic charging system that charges the internal battery during normal operation and automatically switches to battery power during outages. This self-service mechanism eliminates the need for external intervention or complex manual power switching, reducing both construction and operational complexity.
3Object-affected harmful factors
If explosion-proof housing with vent paths and heat sinks is implemented, then internal explosions are contained and cooled, but device complexity increases
Solution Approach 1:
The patent incorporates vent paths and heat sinks into the explosion-proof housing that serve dual purposes: they contain and cool internal explosions to prevent external ignition, while also facilitating heat dissipation from the LED components during normal operation. This converts the potentially harmful explosion energy into a beneficial cooling mechanism, reducing the need for separate cooling systems and thereby offsetting the increased structural complexity.
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 solution provides a reliable, low-maintenance exit sign with extended lifespan LEDs and internal power backup, ensuring safe egress in hazardous environments without the need for external redundant power sources, reducing maintenance and construction costs.
Implementation Method 1
a plurality of light emitting diodes disposed within said second chamber of said housing and directed to shine light through said window into said sign panel; and at least one floodlight comprising one or more light emitting diodes
Implementation Method 2
said front cover and said housing defining a heat sink for cooling said gases exiting said housing through said vent path
Data Source
AI summary
An exit sign includes an explosion-proof housing having a first chamber and a second chamber within the housing separated by a divider wall, a bottom plate attached to said housing and defining an interface between said housing and said bottom plate, and a window, disposed in said bottom plate, containing a clear glass or plastic window pane and located proximate to said first chamber of said housing, wherein a volume of said first chamber, a housing wall thickness surrounding said first chamber, a divider wall thickness, and a window pane thickness are arranged and designed according to an expected internal explosion pressure within said first chamber, and wherein a volume of said second chamber, a housing wall thickness surrounding said second chamber, and a divider wall thickness are arranged and designed according to an expected internal explosion pressure within said second chamber. The exit sign includes a generally planar sign panel coupled to said housing at said window, an indicium disposed on said sign panel, a plurality of light emitting diodes disposed within said second chamber of said housing and directed to shine light through said window into said sign panel, and at least one floodlight comprising one or more light emitting diodes directed to illuminate a region in proximity with said exit sign.