Underwater Torch Insulating Valve for Flashback Prevention
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Solution Overview
Problem
Underwater cutting torches face risks of fire, explosion, and electrical shock due to the combination of oxygen, high heat, and saltwater environments, which can cause the torch to ignite and lead to damage and injury, exacerbated by wear and tear and electrolysis.
Innovation Solution
A torch design featuring a housing with a control valve assembly and torch head that are electrically isolated, using insulating materials like PTFE and fiberglass to prevent combustion and electrolysis, along with a non-return valve and ceramic flash arrester washer to inhibit flashback and reduce electrical pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxygen and electrical current are provided together in the torch handle for cutting operations, then cutting capability is improved, but the risk of fire, explosion, and electric shock increases
Solution Approach 1:
The torch is divided into separate functional zones: the handle contains only electrical components for arc generation, while the torch head contains oxygen delivery and cutting rod components. This spatial segmentation isolates the oxygen supply from the electrical arc generation point, reducing the risk of combustion in the handle while maintaining cutting capability at the torch head.
Solution Approach 2:
An electrically insulating material is introduced as an intermediary between the electrical components in the handle and the oxygen/cutting rod components in the torch head. This intermediary barrier prevents electrical current from contacting oxygen or combustible materials, thereby eliminating the fire and explosion risk while allowing both functions to coexist in the same device.
2Adaptability or versatility
If the torch operates in salt water environment, then underwater cutting capability is enabled, but electrolysis degrades metal parts and increases leakage risk
Solution Approach 1:
Electrically insulating materials serve as intermediaries between conductive metal parts within the torch structure. These insulators break up continuous electrical pathways that would otherwise allow electrolysis to occur in the salt water environment, preventing degradation of metal parts and reducing leakage risk while maintaining underwater operational capability.
Solution Approach 2:
The torch incorporates composite construction combining electrically insulating materials with metal components. This composite structure provides both the mechanical strength needed for underwater operation and the electrical isolation necessary to prevent electrolysis in the salt water environment, thereby improving reliability without sacrificing adaptability.
3Duration of action of moving object
If wear and tear occurs in the torch, then operational experience is gained, but the risk of torch ignition and injury to the diver increases
Solution Approach 1:
Electrically insulating materials act as permanent intermediaries that maintain their protective function throughout the torch's service life. Even as other components experience wear and tear, the insulators continue to prevent electrical contact with oxygen and combustible materials, thereby maintaining safety levels throughout the entire operational duration of the torch.
Solution Approach 2:
The design incorporates protective insulating barriers in advance, before any wear or damage can occur. These preemptive protective measures ensure that even as the torch ages and components degrade, the fundamental safety barrier against ignition remains intact, cushioning against the increased risks that would normally accompany extended use.
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 design significantly reduces the risk of combustion and electrical hazards within the torch body, enhancing safety and durability in underwater operations by preventing flashback and electrolysis, thus protecting the diver and the equipment.
Implementation Method 1
a non-return valve coupled to the housing so as to inhibit flow of hot gasses from passing through the nozzle end into the torch in the event of a flash back or other anomaly
Implementation Method 2
a portion of the passageway through which oxygen is transmitted from the control valve assembly to the torch head is formed of an electrically insulating material
Implementation Method 3
an electrically insulating material that is also a substantially non-combustible material that, when ignited, will not produce sufficient heat to continue to burn in the presence of an oxygen flow. In one specific implementation, the electrically insulating material is formed of a polytetrafluoroethylene (PTFE) material
Implementation Method 4
a sheath of reinforcing material that inhibits leaks forming in the gas pathway, that is also formed of a material that is resistant to burning. In one example, the sheath of reinforcing material is formed of fiberglass mesh
Implementation Method 5
the torch has portions that are electrically charged and the material being cut is oppositely charged which can result in electrolysis paths forming which can degrade or damage the metal parts of the torch
Data Source
AI summary
A underwater cutting torch having a control valve assembly, a check valve assembly and a torch head all positioned within a housing. The control valve assembly and check valve assembly include a passageway for gasses to flow that includes a coupler formed of PTFE material to inhibit combustion within the handle of the underwater cutting torch.