Inflatable Door Seal Layout for Fast Vacuum Train Boarding
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Solution Overview
Problem
Vacuum trains face challenges in allowing quick, safe, and comfortable access to vehicles at stations due to the vacuum environment, which hinders the efficient opening and closing of doors, leading to prolonged standstill times.
Innovation Solution
A door system utilizing inflatable and deflatable ring-shaped seals that surround both vehicle and station doors, minimizing air introduction and evacuation time by sealing the gap between the vehicle and the tunnel, allowing for rapid door operation without moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional airlock systems are used to seal and equalize pressure before door opening, then passenger safety is ensured, but standstill time at stations is prolonged
Solution Approach 1:
The sealing system is divided into multiple independent inflatable seals positioned at different locations (vehicle door seal, station door seal, and gap seal). Each seal can be inflated and deflated independently to create localized sealed zones, allowing progressive pressure equalization rather than requiring complete airlock operation. This segmentation enables faster, staged door opening while maintaining safety.
Solution Approach 2:
The inflatable seals are inflated in advance to create sealed zones before the actual door opening process begins. By pre-positioning the seals and creating sealed compartments, the system prepares the pressure equalization pathways ahead of time, reducing the overall time required for safe door operation.
2Productivity
If the gap between vehicle and tunnel wall is left open for quick access, then boarding speed is improved, but vacuum leakage increases
Solution Approach 1:
The inflatable gap seal provides a dynamic sealing solution that can be inflated to close the gap when vacuum maintenance is required and deflated to open the gap for quick passenger access. This dynamic adjustment allows the system to adapt between the two opposing requirements of vacuum integrity and rapid boarding.
Solution Approach 2:
The system uses pneumatic inflation of elastic seals to create temporary barriers against vacuum leakage. By introducing compressed air or gas into the inflatable seals, the system can rapidly deploy sealing elements without mechanical moving parts, effectively closing the gap between the vehicle and tunnel wall when needed.
3Reliability
If multiple seals are deployed to ensure complete sealing, then vacuum integrity is maintained, but system complexity increases
Solution Approach 1:
The system uses flexible inflatable seals made of elastic materials that can be inflated to various shapes and sizes to conform to the sealing surfaces. These flexible membranes provide effective sealing without requiring complex rigid mechanical structures, reducing overall system complexity while maintaining vacuum integrity.
Solution Approach 2:
The inflatable seals are designed to be self-sealing through their elastic properties. When inflated, they automatically conform to the sealing surfaces and maintain the seal without requiring additional mechanical fastening or adjustment mechanisms. The seals self-adjust to maintain vacuum integrity, reducing the need for complex control systems.
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 door system significantly reduces standstill times at stations by minimizing air leakage and evacuation time, enabling faster boarding and alighting processes, and is more efficient than traditional airlock systems.
Implementation Method 1
at least one inflatable and deflatable ring shaped seal which is positioned to surround both doors when the doors are in their corresponding position and which in its inflated state seals both doors and the space between them against the vacuum within the pipes and/or tunnels by filling the gap between the vehicle outer surface and the pipe and/or tunnel wall at the station
Implementation Method 2
which does not fill the gap when being in its deflated state
Data Source
AI summary
A door system for a vacuum train includes at least one vehicle with at least one vehicle door and a track including at least one evacuated pipe that guides and propels elements within the pipe. The track includes at least one station outside of the pipe with at least one station door arranged within the wall of the pipe to selectively close and open the station towards the pipe. The vehicle door and the station door being arranged in a corresponding position when the vehicle is at rest, so that persons can leave or enter the vehicle when the vehicle door and the station doors are open at the rest position. The door system comprises at least one inflatable ring shaped seal (22) which surrounds both doors when the doors are in their corresponding position and which seals in its inflated position both doors against the vacuum within the pipes.