Explosion-Proof Indicator Light Flame Path Design
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Solution Overview
Problem
Existing indicator lights in hazardous and explosive environments face challenges in meeting certification standards due to exposure of light sources to damaging forces, leading to increased costs and reduced reliability, and they often require potting compound to create a flame barrier which complicates maintenance and repair.
Innovation Solution
The design incorporates a light source positioned at the bottom of a light guide within an explosion-proof enclosure, forming a flame path between the light guide and the housing, eliminating the need for potting compound and allowing for easier access and maintenance, while maintaining compliance with standards for explosion-proof enclosures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the light source is exposed in existing indicator lights, then the light source is accessible for maintenance, but the light source is damaged by external forces leading to reduced reliability
Solution Approach 1:
The housing is divided into a removable first portion and a fixed second portion, allowing the light source to be segmented from the main housing structure. This enables maintenance access by removing only the first portion while keeping the light-tight seal intact when assembled, resolving the contradiction between accessibility and protection.
Solution Approach 2:
A flame path is introduced as an intermediary protective barrier between the light source and the external environment. This flame path allows controlled access while maintaining explosion-proof integrity, enabling maintenance without compromising light source reliability in hazardous environments.
2Reliability
If potting compound is used to create a flame barrier, then explosion-proof standards are met, but maintenance and repair are complicated
Solution Approach 1:
The housing is segmented into removable and fixed portions, eliminating the need for potting compound to secure components. The removable first portion can be easily detached for maintenance while maintaining flame path integrity, resolving the contradiction between explosion-proof compliance and ease of repair.
Solution Approach 2:
The potting compound is extracted/removed from the design entirely. Instead of using adhesive compounds to create flame barriers, the patent uses a mechanical flame path through the removable housing portion, simplifying maintenance while maintaining safety compliance.
3Reliability
If expensive materials are used for the lens, then the indicator light meets high reliability standards, but manufacturing costs increase
Solution Approach 1:
The lens is designed as a replaceable component within the removable first portion of the housing. Instead of using expensive durable materials, a less expensive lens can be used that can be easily replaced during maintenance, reducing manufacturing costs while maintaining reliability through replaceability.
4Length of stationary object
If the light guide length is reduced, then the housing length can be reduced, but the flame path configuration becomes more critical
Solution Approach 1:
The housing configuration is made dynamic with a removable first portion that can be taken off for maintenance. This allows the light guide to be shorter while the flame path integrity is maintained through the removable housing design rather than relying solely on fixed structural constraints.
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 enhances the reliability and reduces manufacturing costs of indicator lights by allowing the use of less expensive materials for the lens and enabling easier maintenance, while ensuring compliance with hazardous location standards.
Implementation Method 1
a light guide disposed within the housing at a distal end of the housing
Data Source
AI summary
An indicator light is disclosed herein. The indicator light can include a housing having at least one wall, where the at least one wall forms a cavity, and where the housing has a first length. The indicator light can also include a light guide disposed within the housing at a distal end of the housing, where the light guide has a second length that is less than the first length. The indicator light can further include a light source disposed adjacent to the light guide. The housing and the light guide can form a flame path therebetween.