Rail Vehicle Sand Conveying Flow Device Pressure Control
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Solution Overview
Problem
Existing pneumatic sand conveying devices for rail vehicles lack efficient control and adjustment of pressure, leading to variations in sand conveyance that affect transport speed and require additional blow-out devices for pipe emptying.
Innovation Solution
A flow device with a pressure chamber and controllable pressure device, utilizing air inlet openings and bypass lines to generate and regulate pressure, allowing for precise control of sand conveyance and pipe emptying without altering transport speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a compressed air injector is used to convey sand, then sand can be conveyed in front of the wheels, but the air pressure becomes briefly higher at the beginning of sand spreading than required for the desired mass flow
Solution Approach 1:
The system dynamically adjusts the air pressure parameter by introducing bypass air to modulate the pressure in the pressure chamber, allowing the air pressure to be precisely controlled at the desired level rather than being briefly high and uncontrolled at the beginning of operation
Solution Approach 2:
A bypass line with bypass air inlet serves as an intermediary mechanism to regulate the air pressure by providing a controlled path for air introduction, acting as a mediator between the compressed air source and the pressure chamber to prevent excessive pressure buildup
2Productivity
If additional blow-out devices are used to empty the sanding pipe, then the pipe can be emptied, but the device complexity increases
Solution Approach 1:
The flow device with bypass air introduction serves multiple functions: it regulates air pressure during sand conveyance and simultaneously empties the sanding pipe by controlling the pressure chamber, eliminating the need for separate blow-out devices and reducing overall system complexity
Solution Approach 2:
The pressure regulation function and pipe emptying function are merged into a single flow device system, where the same bypass air introduction mechanism that controls pressure during conveyance also enables efficient pipe emptying, consolidating multiple functions into one integrated component
3Productivity
If the conveying air mass flow is varied to control sand conveyance, then sand mass flow can be adjusted, but the transport speed varies
Solution Approach 1:
The bypass air acts as an intermediary that allows independent control of sand mass flow by modulating the pressure chamber pressure, separating the sand conveyance control from the transport speed control and enabling precise sand flow regulation without affecting the consistent transport speed
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
Enables precise regulation of sand mass flow and efficient emptying of the sanding pipe system, eliminating the need for special blow-out devices and maintaining consistent transport speed.
Implementation Method 1
The controllable pressure device has at least one blowing-in device for blowing air into the pressure chamber in order to control the pressure
Implementation Method 2
The pressure generated in the pressure chamber serves to suck sand from a sand container of the sand conveying device
Data Source
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AI summary
The invention relates to a flow device (105) for controlling and/or adjusting a pressure in a pneumatic sand-conveying device for a rail vehicle, which flow device has at least one pressure chamber (110) and a controllable pressure device (115). The pressure chamber (110) comprises a conveying nozzle interface (120) to a conveying nozzle device (125) for generating a pressure in the pressure chamber (110). The controllable pressure device (115) is coupled to the pressure chamber (110) and is designed to generate a pressure in order to control and/or adjust the pressure in the pressure chamber (110).