Horizontal Rail Sand Conveying Layout for Compact High-Capacity Storage
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Solution Overview
Problem
The distance between the sand inlet and outlet in existing pneumatic sand conveying devices for rail vehicles is significant, limiting the size of the sand storage container and affecting the efficiency of sand application.
Innovation Solution
A compact pneumatic sand conveying device with a horizontal arrangement of obstacle, mixing, and outlet devices, minimizing the distance between the sand inlet and outlet, and incorporating a labyrinth unit to prevent sand leakage, along with a Laval nozzle for efficient sand metering and a compensating air duct for pressure regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional pneumatic sand conveying devices are used with vertical arrangement of components, then the distance between sand inlet and outlet is reduced, but the sand storage container size is limited
Solution Approach 1:
The patent transitions from a vertical arrangement of sand conveying components to a horizontal arrangement. The obstacle device, mixing device, and outlet device are positioned side-by-side in the horizontal plane rather than stacked vertically, allowing the sand storage container to extend downward while maintaining a compact overall footprint. This dimensional reconfiguration resolves the contradiction by enabling both large sand storage capacity and controlled sand delivery distance.
2Quantity of substance
If the sand storage container is enlarged to increase sand capacity, then the distance from the sand inlet to the outlet increases, affecting sand application efficiency
Solution Approach 1:
The sand conveying path is segmented into distinct functional zones: the obstacle device creates a controlled flow path, the mixing device aerates and distributes sand particles, and the outlet device meters and directs sand delivery. This segmentation allows the sand storage container to be enlarged while maintaining efficient sand application through optimized flow control at each stage.
Solution Approach 2:
The mixing device acts as an intermediary between the large sand storage container and the outlet device. It receives sand from the obstacle device, introduces compressed air to create a pneumatic flow, and ensures uniform sand distribution before delivery. This intermediary function enables the system to handle large sand volumes while maintaining consistent and efficient sand application.
3Volume of stationary object
If a compact horizontal design is implemented, then sand storage capacity is increased, but device complexity increases due to additional components
Solution Approach 1:
Multiple functions are merged into integrated components. The obstacle device simultaneously controls sand flow direction and prevents bypassing. The mixing device combines sand reception, air injection, and particle distribution functions. The outlet device integrates metering and delivery control. This functional merging reduces overall system complexity while enabling a compact horizontal design with large sand storage capacity.
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 a more compact design with a larger sand storage capacity and efficient sand distribution, ensuring reliable sand application without clogging, even in adverse conditions.
Implementation Method 1
a mixing device (110) for receiving and forwarding sand from the obstacle device by compressed air
Implementation Method 2
featuring a labyrinth unit to prevent sand leakage and a Laval nozzle for accurate sand metering and conveying
Data Source
AI summary
A pneumatic sand conveying device for a sanding system of a rail vehicle includes an obstacle device which is fluidically coupled to a sand input for receiving sand from a sand storage container, the obstacle device being shaped to form an obstacle between the sand input and a mixing device fluidically coupled to the obstacle device. In addition, the sand conveying device has the mixing device for receiving and forwarding sand from the obstacle device by compressed air and a discharge device fluidically coupled to the mixing device to dispense the sand from the sand conveying device through a sand outlet. The obstacle device, the mixing device and the discharge device are arranged in a horizontal plane when the sand conveying device is in a state ready for operation.