Locking-Cap Module Carrier for Safe HotPlug in Hazardous Areas
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Solution Overview
Problem
Existing power supply units in explosion-risk areas face challenges in ensuring safe operation and easy maintenance, particularly in preventing live unplugging or plugging in potentially explosive atmospheres, which can lead to ignition sources and require shutting down larger areas to avoid sparking or arcing.
Innovation Solution
A module carrier with a housing and locking cap that includes an electromechanical pushbutton system, where the pushbutton is actuated by the locking cap, ensuring the module is switched to a non-live state before removal, and featuring a locking mechanism that prevents live unplugging or plugging, combining mechanical and electrical safety measures for increased user friendliness and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical fixing of wires and contacts is used, then safety against sparking is improved, but ease of operation deteriorates due to complex assembly and disassembly procedures
Solution Approach 1:
The system performs preliminary action by switching the power supply to currentless state before the unplugging operation is completed. The locking cap must be removed to actuate the pushbutton, which de-energizes the circuit before the module can be physically disconnected, preventing sparking during the unplugging process.
2Reliability
If power supply is switched to currentless before unplugging, then safety against ignition sources is improved, but productivity deteriorates due to shutdown requirements
Solution Approach 1:
The system segments the power supply shutdown to only affect the specific module being replaced, not the entire system. The locking cap mechanism isolates the de-energizing action to the individual module level, allowing other modules to remain operational and maintaining system productivity during maintenance operations.
3Reliability
If locking mechanism is added to prevent live unplugging, then safety is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is merged with the electrical switching function in a single integrated component. The locking cap serves dual purposes: it mechanically prevents access to the plug connection and simultaneously actuates the pushbutton to switch off the power supply. This combination eliminates the need for separate locking and switching mechanisms, reducing overall device complexity.
4Ease of operation
If electromechanical pushbutton system is used, then ease of operation is improved, but manufacturing cost increases
Solution Approach 1:
The locking cap is designed with multi-functionality, serving as both a mechanical lock to prevent access and an actuating mechanism for the pushbutton. This universal design consolidates multiple functions into a single component, reducing the total number of parts needed and lowering manufacturing costs despite the electromechanical complexity.
Data Source
AI summary
A module carrier for use in a potentially explosive atmosphere, in particular in a potentially explosive atmosphere in the form of gas or dust, including a housing for receiving at least one module with a pushbutton, wherein the at least one module can be switched to live via the pushbutton, wherein the module carrier further includes a locking cap, wherein the locking cap has a device for actuating the pushbutton and wherein, in the unactuated state, the pushbutton is switched to not live and the pushbutton is actuatable by locking the locking cap using the actuating device.