Multifunctional Switchgear Duct With Pressure-Activated Arc Sealing
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Solution Overview
Problem
Existing switchgear compartments face challenges with space constraints and inefficiencies in cooling and arc event protection, as separate air ducts and safety flaps are not always suitable.
Innovation Solution
A multifunctional duct with a sealing flap that transitions between un-activated and activated states, allowing air flow in normal conditions and blocking gas escape during arc events, featuring a butterfly flap design and self-locking mechanism for secure sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate air ducts and safety flaps are used, then cooling function and arc protection function are provided, but device complexity increases and space is consumed
Solution Approach 1:
The patent combines the air duct and safety flap into a single integrated multifunctional duct. The duct body serves as both the cooling air passage and the arc protection barrier, eliminating the need for separate components. This merging reduces structural complexity while maintaining both cooling and arc protection functions.
Solution Approach 2:
The multifunctional duct is designed to perform multiple functions: it serves as a cooling air duct during normal operation and as an arc protection barrier during fault conditions. The sealing flap within the duct provides both flow control and sealing functions, making the single component universal for both cooling and safety purposes.
2Adaptability or versatility
If separate air ducts and safety flaps are used, then cooling and protection functions are achieved, but installation space increases
Solution Approach 1:
By merging the air duct and safety flap into one integrated multifunctional duct, the patent reduces the total volume required for installation. The sealing flap is housed within the duct body, eliminating the need for separate mounting spaces for independent components, thus saving installation space while providing both cooling and arc protection functions.
3Reliability
If sealing flap is used to block gas escape during arc events, then compartment protection is improved, but air flow restriction may occur
Solution Approach 1:
The sealing flap is designed as a dynamic component that automatically transitions between open and closed positions based on pressure differential. During normal operation, the flap remains open to allow free air flow for cooling. During arc events, the pressure wave automatically closes the flap to seal the compartment. This dynamic behavior ensures both efficient cooling during normal operation and reliable sealing during faults without manual intervention.
Solution Approach 2:
The sealing flap system is self-actuating through pressure differential. The arc event itself generates the pressure wave that closes the flap, and the pressure differential also drives the flap open during normal operation. The system serves itself without external control mechanisms, ensuring both unrestricted air flow during cooling and automatic sealing during arc events.
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
Enables efficient cooling and safe containment of gases during arc events while saving space and simplifying installation by integrating cooling and safety functions into a single duct.
Implementation Method 1
The multifunctional duct is configured such that a pressure differential between the inside of the compartment and the outside of the compartment is configured to transition the sealing flap from the un-activated position to the activated position
Implementation Method 2
In case of an Internal arc event, the pressure wave will force the flap against the grid sealing the compartment A
Data Source
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AI summary
The present invention relates to a multifunctional duct (10) for a compartment (100) of a switchgear, the multifunctional duct comprising: - a body (20, 30); and - a sealing flap (40); wherein the body comprises a first opening in a front structure (20) and a second opening in a rear structure (30); wherein the sealing flap is located within the body; wherein the multifunctional duct is configured to be located in a wall of a compartment of a switchgear; wherein when located in the wall of the compartment of the switchgear, in a first state, the multifunctional duct is configured to permit the flow of air and/or gas into the compartment of the switchgear, and wherein in the first state the sealing flap is in an un-activated position and the multifunctional duct is configured to permit air and/or gas to enter the second opening in the rear structure and flow through the body and exit the first opening in the front structure such that the air and/or gas can flow into the compartment of the switchgear; wherein when located in the wall of the compartment of the switchgear, in a second state, the multifunctional duct is configured to inhibit the flow of air and/or gas out of the compartment of the switchgear, and wherein in the second state the sealing flap is in an activated position and the multifunctional duct is configured to inhibit air and/or gas to exit the second opening in the rear structure; and wherein when located in the wall of the compartment of the switchgear the multifunctional duct is configured such that a pressure differential between the inside of the compartment and the outside of the compartment is configured to transition the sealing flap from the un-activated position to the activated position.