Reusable Explosion-Proof Conduit Fitting With Granular-Foam Sealing
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Solution Overview
Problem
Existing explosion-proof conduit fittings are not reusable and require permanent fixture, lacking the ability to adjust or modify electrical conduit systems without destruction, posing a risk in preventing gas migration and explosions.
Innovation Solution
A removable explosion-proof conduit fitting utilizing a combination of granular materials like sand for pressure distribution and friction resistance, and a gas-tight expanding closed cell foam to create a seal that prevents gas migration and flames, allowing for adjustable and maintainable sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cured epoxy fills and gas-tight fittings are used to prevent explosions and gas migration, then explosion-proof capability is improved, but the fitting becomes permanently fixed and cannot be adjusted or reused
Solution Approach 1:
The patent changes the physical state and properties of the sealing material from permanently cured epoxy to a two-component system: granular fill material (solid particles that can be reconfigured) combined with a removable gas-tight compound (such as expanding foam that can be added or removed). This parameter change allows the system to maintain explosion-proof sealing while enabling disassembly and reuse of the fitting.
Solution Approach 2:
The invention uses a composite filling system combining granular fill material (such as sand or ceramic beads) with a removable gas-tight compound (such as expanding closed-cell foam). The granular material provides structural support and pressure distribution, while the foam provides the gas-tight seal. This composite approach maintains explosion-proof reliability while allowing the foam component to be removed for reuse.
2Reliability
If permanent fixture fittings are used to ensure explosion-proof sealing, then gas migration prevention is improved, but modification and addition of wires requires destruction of fittings and conduit
Solution Approach 1:
The patent changes the permanence parameter of the sealing system by using uncured expanding foam that can be added, removed, and reconfigured, unlike permanently cured epoxy. This allows wires to be added, removed, or modified by simply adding or removing the foam material without destroying the fitting or conduit structure.
Solution Approach 2:
The sealing system transitions from a static, permanent fixture to a dynamic system where the gas-tight compound can be added or removed as needed. The granular fill remains in place to maintain structural integrity, while the foam component can be dynamically adjusted to accommodate wire modifications while maintaining gas-tight sealing.
3Adaptability or versatility
If removable sealing compounds are used to enable adjustment and reuse, then adaptability is improved, but the ability to withstand extreme explosion pressures may be compromised
Solution Approach 1:
The patent uses a composite system where granular fill material (such as sand, ceramic beads, or metal shot) provides structural strength and pressure distribution, while the removable gas-tight compound (such as expanding foam) provides sealing. The granular material's friction and interlocking properties maintain explosion pressure resistance even when the foam is present or being adjusted.
Solution Approach 2:
The invention assigns different functional qualities to different components: the granular fill material handles mechanical strength and pressure distribution throughout the fitting, while the removable gas-tight compound handles only the sealing function at the interfaces. This local quality differentiation allows the sealing component to be removable while the structural component maintains explosion pressure resistance.
4Strength
If granular fill material is used for pressure distribution and friction resistance, then explosion pressure resistance is improved, but gas-tight sealing alone is insufficient without additional gas-tight compound
Solution Approach 1:
The patent combines granular fill material (providing friction resistance and pressure distribution) with a gas-tight compound such as expanding closed-cell foam (providing gas-tight sealing). The granular material prevents movement and distributes explosion pressures, while the foam fills voids and creates the gas-tight barrier, with both materials working together to achieve both objectives simultaneously.
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 effectively prevents gas migration and explosions by providing a reusable, adjustable seal that withstands extreme pressures and temperatures, ensuring safety and flexibility in electrical conduit systems.
Implementation Method 1
pressure on one side or end of the material causes this pressure to be uniformly distributed throughout the material
Implementation Method 2
This uniform distribution of pressure results in increased frictional resistance in all directions, including increased friction on the sidewalls of the fitting
Implementation Method 3
the granular/fine fill material has the added benefit of cooling gases from an explosion below the ignition temperature of flammable gases
Implementation Method 4
The removable gas-tight compound such as a fire stopping compound or other removable gas-tight material that will fill voids and provide a gas-tight barrier. The fire-stopping compound is an expanding closed cell foam that prevents the transmission of flammable gases.
Data Source
AI summary
An explosion-proof conduit fitting configured to be placed between two pieces of electrical conduit, thereby connecting the two conduit pieces together such that electrical lines running through the two conduits also pass through the fitting. An embodiment utilizes two primary components to prevent migrations of gases and to provide the structural requirement of withstanding the extreme pressures of explosions from allowing flames and temperatures above the ignition temperature of flammable gases to pass through the hazardous area boundary: a granular fill, such as sand; and a removable gas-tight fire-stopping compound, such as an expanding closed cell foam.