External Actuating Flap for Railway Air Capture
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Solution Overview
Problem
Air capture devices on railway vehicles face disturbances in airflow due to varying wind strength and vehicle speed, leading to clogging or asphyxiation of air treatment systems, as existing mechanical control systems disrupt airflow.
Innovation Solution
An air capture device with an external actuating flap and counterweight mechanism, featuring a shutter with a bumpy surface and a protective grille, regulates airflow by balancing forces to maintain a laminar flow through the duct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical control system with internal flap is used to regulate airflow, then the air flow can be controlled, but the airflow is disturbed and disrupted
Solution Approach 1:
The invention extracts the actuating flap from the internal air duct environment and relocates it to the external environment. The external flap is positioned upstream of the air intake opening, allowing it to regulate airflow before the air enters the duct system. This extraction eliminates the disturbance caused by internal mechanical components while maintaining the airflow control function.
Solution Approach 2:
The external actuating flap serves as an intermediary element between the external air stream and the air intake opening. It modulates the airflow externally before it enters the system, acting as a mediator that prevents direct interaction between internal components and the air flow, thereby reducing turbulence and disruption within the duct.
2Adaptability or versatility
If wind strength and vehicle speed vary, then air supply to ventilation system changes, but this causes clogging or asphyxiation of air treatment system
Solution Approach 1:
The invention implements a feedback mechanism where the external actuating flap responds to variations in wind strength and vehicle speed by automatically adjusting its position. The airflow conditions themselves act as the feedback signal that drives the adjustment of the flap, which in turn regulates the air intake to maintain stable operation of the air treatment system under varying external conditions.
Solution Approach 2:
The system performs self-regulation through the external flap that automatically adjusts to varying wind and speed conditions without requiring external control intervention. The flap's position is determined by the prevailing airflow conditions, enabling the system to adapt to changing environmental factors and prevent clogging or asphyxiation of the air treatment system autonomously.
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 device effectively regulates airflow, reducing disturbances and ensuring an undisturbed flow at the outlet, thereby preventing clogging and maintaining system functionality.
Implementation Method 1
a means for returning the shutter to its rest position
Implementation Method 2
an actuating flap of the shutter, offering an exposed wall following the direction of air circulation
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to an air capture device (13) equipped with an air flow control device of the type comprising: - an air duct delimiting an air intake outlet along a direction of air circulation, - a shutter (36) of the air duct, mounted movable relative to the duct between a rest position and a position of at least partial closure of the duct, - a means of returning the shutter (36) to its rest position, - a flap (50) for actuating the shutter (36), providing a wall exposed along the direction of air circulation, characterized in that the actuating flap (50) is external to the air duct.