Elastic Deformable Contacts for Railway Current Collection
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Solution Overview
Problem
Railway vehicles face challenges in efficiently collecting electrical energy, particularly in urban areas where overhead catenaries are undesirable, leading to issues with heating and maintenance due to rigid pantograph systems that are not compatible with frequent station stops and limited current transfer efficiency.
Innovation Solution
An electrical energy collection device with elastically deformable contacts that change configuration between deployed and retracted positions, ensuring robust and efficient electrical contact with a power supply bar, reducing overheating and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid shoes are used in contact with the aerial catenary, then structural strength is improved, but electrical contact quality deteriorates leading to localized heating
Solution Approach 1:
The patent changes the physical state and mechanical properties of the contact elements by replacing rigid shoes with elastic deformable contacts. This parameter change allows the contacts to adapt their shape and pressure distribution, improving electrical contact quality while maintaining structural integrity through the elastic properties of the material.
Solution Approach 2:
The patent employs composite material structures in the collector assembly, combining conductive materials with elastic deformable elements. This composite approach enables simultaneous achievement of electrical conductivity, mechanical strength, and elastic deformability, resolving the contradiction between structural strength and electrical contact quality.
2Speed
If classical pantograph architecture is used, then deployment speed is improved, but adaptability to frequent station stops deteriorates
Solution Approach 1:
The patent introduces dynamic characteristics to the collector system through elastic deformable contacts that can automatically adapt their configuration. The collector can quickly deploy and retract while the elastic elements dynamically adjust to maintain optimal contact, enabling adaptability to frequent station stops without sacrificing deployment speed.
Solution Approach 2:
The elastic deformable contacts possess self-adjusting capabilities, automatically adapting their shape and pressure distribution in response to varying operational conditions. This self-service characteristic eliminates the need for complex control mechanisms, enabling quick adaptation to frequent station stops while maintaining simple classical pantograph architecture.
3Stability of the object's composition
If rigid supply bar is used, then structural stability is improved, but current transfer efficiency deteriorates due to limited contact surface
Solution Approach 1:
The patent changes the contact interface parameters by replacing rigid contacts with elastic deformable ones. This parameter change increases the effective contact surface area through elastic deformation, improving current transfer efficiency while maintaining the structural stability of the rigid supply bar.
Solution Approach 2:
The elastic deformable contacts act as an intermediary between the rigid supply bar and the collector. This intermediary element transfers mechanical force and electrical current more effectively, increasing the contact surface area and current transfer efficiency without compromising the structural stability of the rigid supply bar.
4Reliability
If metal braids are used to improve electrical contact, then electrical conductivity is improved, but device complexity and maintenance needs increase
Solution Approach 1:
The patent replaces complex metal braid systems with simpler elastic deformable contacts that are easier to manufacture and maintain. While the metal braid system aimed to improve electrical conductivity, the elastic contacts achieve similar or better results with reduced complexity, effectively replacing a complex component with a simpler, more maintainable alternative.
Solution Approach 2:
The patent changes the material parameters and structural configuration from metal braids to elastic deformable contacts. This parameter change simplifies the device structure while maintaining or improving electrical conductivity through the elastic deformation capability that ensures consistent contact pressure and surface area.
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 provides reliable and efficient electrical energy transfer with reduced risk of overheating and maintenance costs, accommodating frequent station stops and improving current passage capacity.
Implementation Method 1
each blade being elastically deformable and being designed to assume a relaxed configuration, when the capture device is in the retracted configuration, and a bent configuration, when the capture device is in the deployed configuration. The contact zone of each blade has, in the bent configuration, a concavity oriented towards the feed member, with a curvature greater than its curvature in the relaxed configuration.
Data Source
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AI summary
This current-collecting device (12) comprises a fixed base (14) and a collector (16), with a plurality of juxtaposed contacts (34). Each contact includes a blade (38) with an upper surface (S38) oriented towards an electrical supply element (18) and defining a contact area (40) with the supply element. The collector (16) is movable relative to the base, between a deployed configuration of the current-collecting device (12), in which the collector is in a position distant from the base and is able to collect electricity from the supply element, and a retracted configuration. To ensure efficient electrical transfer, each blade is elastically deformable and, in the deployed configuration of the current-collecting device, assumes a flexed configuration in which the contact area (40) has a concavity oriented towards the supply element.