Deforming Pressure Ring Seal for Arc-Resistant Switchgear Ducts
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Solution Overview
Problem
Current arc-resistant switchgear enclosures face challenges in preventing the accidental blow-out of pressure waves through flanged connections between duct sections during an arc-fault event, leading to potential escape of arc products and structural deformation, which can result in safety hazards and increased costs due to required reinforcement.
Innovation Solution
The implementation of a pressure ring that is fastened to the underside or internally within the duct panels to absorb and divert pressure waves, allowing the duct panels to deform and maintain the integrity of the flanged butt joints by filling gaps created during an arc-fault event.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If flanged connections between duct sections are reinforced with added structural components and strengthening materials, then structural integrity is improved to prevent blow-out of pressure waves, but cost increases, assembly time increases, and risk of kink development increases
Solution Approach 1:
The patent employs a flexible gasket positioned at the flanged connection between duct sections. This gasket deforms under pressure wave impact to seal the connection, preventing blow-out without requiring rigid reinforcement structures. The flexible membrane absorbs the pressure impulse while maintaining the seal, thereby achieving structural integrity without increased assembly complexity or cost.
2Stability of the object's composition
If flanged connections are rigidly reinforced to prevent deformation, then structural integrity is improved, but the likelihood of developing kinks increases that permit escape of pressure wave
Solution Approach 1:
The patent utilizes a dynamic sealing approach where the flexible gasket is allowed to deform in response to pressure wave impact. Rather than rigidly constraining the flanged connection, the gasket dynamically adjusts its shape to maintain the seal during transient pressure events. This dynamic behavior prevents kink formation while maintaining both joint stability and seal reliability.
3Ease of manufacture
If modular duct extensions are joined at flanges without reinforcement, then ease of assembly is improved, but structural integrity deteriorates allowing accidental blow-out of pressure wave
Solution Approach 1:
The patent introduces a flexible gasket as an intermediary element at the flanged connection between modular duct sections. This gasket mediates between the simple flanged joint design and the requirement for pressure wave resistance. The gasket is easily installed with the flanged connection while providing the necessary sealing capability to prevent blow-out, thereby maintaining both assembly ease and pressure resistance.
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 pressure ring effectively blocks the escape of pressure waves through the flanged butt joints, preventing unintended ventilation and maintaining structural integrity during arc-fault events, thus reducing the risk of damage and enhancing safety without the need for costly reinforcements.
Implementation Method 1
The pressure ring deforms with the first and second panels in response to a peak pressure of the pressure wave, the deforming causing the pressure ring to fill-in gaps created in the flanged butt joint by the peak pressure during the arc-fault event
Data Source
Figure 1
Figure 2
Figure 3A~4C
AI summary
An electrical enclosure assembly includes a duct chamber with two adjacent duct sections having respective first and second flanges fastened to form a flanged butt joint. The duct sections are in a path through which a pressure wave travels during an arc-fault event from an arc-fault device to an exhaust vent. A pressure ring is fastened internally to at least one of the first and second panels to cover the flanged butt joint. In response to a peak pressure of the pressure wave, the pressure ring deforms with the respective adjoining panels of the duct sections. Although the peak pressure creates gaps in the flanged butt joint, the deformation causes the pressure ring to fill-in those gaps and, thus, block ventilation through the flanged butt joint.