Explosion Flap Valve Holding Mechanism for Vertical Duct Isolation
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Solution Overview
Problem
Existing flap valves rely on gravity and airflow, limiting their installation to horizontal ducts, are non-inspectable, and lack the ability to respond actively to deflagrations from both directions, leading to operational and maintenance risks and reduced reliability.
Innovation Solution
A flap valve with a holding mechanism that maintains the flap in a normally open position, allowing it to close quickly and independently of gravity, with features for inspectability and active triggering by pressure or sensor-activated mechanisms, enabling installation in various orientations and responsive to deflagrations from either direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing flap valves rely on gravity for closing, then the valve can close passively, but the valve must be installed in horizontal ducts only
Solution Approach 1:
The patent applies a spring mechanism that acts as a counterweight force to gravity, enabling the flap to be held in the open position regardless of duct orientation. The spring force counteracts the gravitational force on the flap, allowing the valve to function in vertical, horizontal, or inclined installations without relying on gravity for operation.
2Productivity
If existing flap valves are normally closed, then explosion protection is maintained, but pressure drop and turbulence increase during normal operation
Solution Approach 1:
The patent implements a holding mechanism that actively maintains the flap in the open position during normal operation, eliminating unnecessary resistance to airflow. The mechanism prepares the system for explosion protection by having the closing capability ready, but only activates closure when needed, thus maintaining productivity while ensuring reliability.
3Reliability
If existing flap valves lack inspection mechanisms, then the device remains simple, but operational reliability decreases over time
Solution Approach 1:
The patent incorporates inspection features that provide feedback on the valve's operational status, including the condition of the holding mechanism and flap mobility. This feedback system allows operators to verify proper function during maintenance intervals, ensuring reliability without significantly increasing device complexity.
4Adaptability or versatility
If existing flap valves respond only to single-direction deflagration, then the device complexity is reduced, but protection coverage is limited
Solution Approach 1:
The patent designs the holding mechanism and pressure sensing system to respond to deflagrations from any direction. The mechanism can detect pressure changes whether the deflagration occurs upstream or downstream, providing universal protection coverage. This multi-functional capability is achieved through a symmetric design that responds to pressure differentials regardless of direction.
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 the reliability and flexibility of explosion isolation by ensuring the flap valve can close rapidly and reliably in all orientations, reduces pressure drop and turbulence, and allows for periodic inspection and maintenance, improving safety and operational efficiency.
Implementation Method 1
In the event of a deflagration in the protected volume, a wave of pressure moves upstream (against the direction of normal air inflow) in advance of a propagating flame, and forces the flap valve to close
Implementation Method 2
Existing flap valves depend on gravity as part of the force to aid rotational movement or to close the flap
Data Source
AI summary
An explosion isolation device is disclosed. The explosion isolation device may comprise a conduit having a flap configured to rotate between an open position and a closed position within the conduit, and a holding mechanism configured to hold the flap in the open position. The holding mechanism may be configured to release the flap in the event of an explosion and the flap may be configured to rotate into the closed position after it is released. The device may include a sensor and an actuator configured to actuate the holding mechanism when an explosion is sensed. The conduit may be vertical.