Flow Diode Bypass for Train Braking Air Contamination
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Solution Overview
Problem
During towing operations, especially with high-speed trains, the availability of high-quality air for pneumatic braking systems is not guaranteed, leading to contamination risks and potential braking failures due to inferior air supply, particularly at low temperatures where moving parts in traditional non-return valves can freeze.
Innovation Solution
A fluid line system incorporating a flow diode with no moving parts, arranged in series with a fluid treatment unit and flow limitation unit, allows for controlled fluid flow direction, ensuring that inferior air is treated before entering the braking system and preventing contamination, while maintaining system availability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional non-return valves with moving parts are used to prevent inferior air from entering the braking system, then the fluid flow can be controlled in one direction, but the moving parts can freeze at low temperatures leading to braking failures
Solution Approach 1:
The patent replaces traditional non-return valves with moving parts with a flow diode that has no moving parts. The flow diode uses a porous structure or capillary channels that allow fluid to pass in one direction while blocking it in the opposite direction through surface tension and capillary pressure effects, eliminating the freezing problem associated with moving parts.
Solution Approach 2:
The invention uses fluid pressure and capillary action to achieve one-way flow control. The flow diode utilizes the properties of fluids and porous materials to create directional flow resistance without mechanical moving parts, allowing the system to maintain reliability in cold temperatures.
2Reliability
If a flow diode with no moving parts is used to replace traditional non-return valves, then the system maintains functionality at low temperatures, but the flow resistance characteristics must be carefully balanced with the fluid treatment unit
Solution Approach 1:
The patent optimizes the flow diode's porous structure parameters (pore size, porosity, channel dimensions) to achieve the desired flow resistance characteristics. By carefully selecting these parameters, the flow diode provides sufficient flow resistance to prevent inferior air entry while maintaining adequate flow rates for normal braking operations.
3Object-affected harmful factors
If inferior air is treated before entering the braking system during towing operations, then contamination is prevented, but the fluid treatment unit increases the complexity of the system
Solution Approach 1:
The flow diode acts as an intermediary component between the fluid treatment unit and the braking system. It provides passive one-way flow control that prevents contaminated air from reaching the braking system while allowing treated air to pass through, reducing the need for complex active control mechanisms.
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 solution enhances the service life and efficiency of air lines and braking systems by preventing contamination and maintaining functionality even at low temperatures, with reduced maintenance needs due to the absence of moving parts in the flow diodes.
Implementation Method 1
a flow diode is arranged in the fluid flow path of one bypass line, the flow resistance of which counteracts the flow resistance of the one flow limitation unit
Data Source
Figure 1~3
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Figure 7~9
AI summary
The invention relates to a fluid line system (FLS), comprising a fluid line (21; 56; 86) and a fluid processing assembly (FAA.1) arranged in the fluid flow path of the one fluid line (21; 56; 86), wherein a fluid processing unit (24.1) and a flow limiting unit (SBE.1) of the one fluid processing assembly are arranged in series in the fluid flow path of a line segment (LA.1) of the one fluid line (21; 56; 86). In order to optimize the fluid line system for use in a transitional coupling, the one fluid processing assembly (FAA.1) has a bypass line (BL.1), which bypasses the line segment (LA.1), and a flow diode (SD.1) is arranged in the fluid flow path of the one bypass line (BL.1), the direction of the flow resistance of the flow diode being opposite the direction of the flow resistance of the one flow limiting unit (SBE.1). The invention further relates to a method for processing a fluid that flows through a fluid line (21; 56; 86). The invention further relates to a transitional coupling (15; 53; 83) for coupling coupling devices (7, 12; 37, 42; 67, 72) of two vehicles (2, 3; 32, 33; 62, 63) and a vehicle combination (1; 31; 61) having at least two vehicles (2, 3; 32, 33; 62, 63), the coupling devices (7, 12; 37, 42; 67, 72) of which are coupled by means of such a transitional coupling (15; 53; 83).