Door Mounted Vent Flap for Arc-Resistant Compartment
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Solution Overview
Problem
Conventional arc-resistant compartments in the power generation/distribution industry lack adequate ventilation due to limited openings, which can lead to insufficient airflow and increased temperature rises during arcing events.
Innovation Solution
A door with a vent flap structure that includes a flap member movable between open and closed positions, biased by a spring structure and retained in the open position by a handle structure, automatically closing during arcing events due to internal pressure and spring force to seal the compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional openings are provided in non-door portions of the compartment, then ventilation is provided, but the airflow is insufficient due to limited opening configuration
Solution Approach 1:
The patent applies the dynamics principle by providing a movable flap member that can transition between open and closed positions. The flap member is biased by spring structure to automatically open during normal operation to maximize airflow, and automatically closes during arcing events. This dynamic mechanism allows the venting system to adapt to different operational conditions, providing sufficient airflow quantity without requiring complex fixed opening configurations.
Solution Approach 2:
The patent applies parameter changes by modifying the opening area parameter dynamically through the flap member's movement. During normal operation, the flap member is in the open position providing a large opening area for adequate airflow. During arcing events, the flap member closes to reduce the opening area and prevent gas leakage. This parameter change enables the system to achieve sufficient airflow quantity while maintaining simple opening configuration.
2Object-affected harmful factors
If the compartment is sealed during arcing events, then gas leakage is prevented, but airflow into the compartment is reduced
Solution Approach 1:
The movable flap member dynamically responds to compartment pressure changes. During normal operation with low pressure, the spring structure keeps the flap member open for adequate airflow. During arcing events with high pressure, the pressure overcomes the spring force and automatically closes the flap member to prevent gas leakage. This dynamic behavior resolves the contradiction by providing airflow when needed and sealing when harmful.
Solution Approach 2:
The patent converts the harmful high pressure during arcing events into a beneficial sealing force. The pressure differential generated during arcing automatically actuates the flap member to close, transforming the harmful high pressure condition into the mechanism that prevents gas leakage. This eliminates the need for external sensors or actuators to detect arcing conditions.
3Reliability
If a movable flap member is provided for automatic closing during arcing, then gas leakage is prevented, but the door structure becomes more complex
Solution Approach 1:
The flap member structure is self-actuating and automatically responds to arcing conditions without external control. The spring structure provides automatic biasing to open the flap during normal operation, and the compartment pressure automatically overcomes the spring force to close the flap during arcing. This self-service mechanism achieves reliable arc-resistant performance without requiring complex external actuators, sensors, or control systems.
Solution Approach 2:
The patent extracts the complex control system from the door structure by using a passive, self-actuating flap member mechanism. Instead of integrating motors, sensors, and control electronics into the door, the invention uses simple mechanical elements (flap member, spring structure, retaining structure) that automatically respond to pressure differential. This extraction maintains arc-resistant reliability while minimizing door structure complexity.
4Extent of automation
If spring structure is used to bias the flap member closed, then automatic closing during arcing is achieved, but the retaining mechanism becomes more complex
Solution Approach 1:
The spring structure and retaining structure work together in a self-service manner. The spring structure continuously biases the flap member toward the closed position, and the retaining structure simply needs to provide a light retaining force to hold the flap in the open position during normal operation. When arcing occurs, the pressure automatically overcomes both the retaining force and spring force to close the flap. This self-service mechanism achieves automatic closing without complex control systems.
Solution Approach 2:
The spring structure acts as a mechanical counterweight, continuously applying a biasing force that opposes the compartment pressure. During normal operation, the retaining structure overcomes this spring force to hold the flap open. During arcing, the high compartment pressure overcomes both the retaining force and spring force, automatically closing the flap. This counterweight mechanism simplifies the retaining structure by providing continuous automatic closing pressure.
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
Enhances airflow into the compartment, minimizing temperature rises and preventing gas leakage during arcing events by effectively sealing the opening with the flap member.
Implementation Method 1
Spring structure is engaged with the flap member and is constructed and arranged to bias the flap member to the closed position
Implementation Method 2
during an arcing event in the compartment, pressure within the compartment together with the bias of the spring structure overcomes the retaining force to automatically move the flap member to the closed position
Data Source
AI summary
A door for an arc-resistant compartment includes an opening there-through. Flap structure includes a flap member coupled to the door and movable between an opened position permitting air to pass through the opening, and a closed position covering the opening. Spring structure is engaged with the flap member to bias the flap member to the closed position. Handle structure is coupled to the flap member and extends through the door for moving the flap member to the opened position against the bias of the spring structure. Retaining structure provides a retaining force on the flap member to retain the flap member in the open position, against the bias of the spring structure. During an arcing event in the compartment, pressure within the compartment together with the bias of the spring structure overcomes the retaining force to automatically move the flap member to the closed position.