Interlocked Electrical Socket Switching to Prevent Arc Ignition
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Solution Overview
Problem
Electrical plug and socket assemblies in hazardous environments pose a risk of explosion or fire due to electrical arcs or sparks when connecting or disconnecting the plug from an energized socket.
Innovation Solution
An electrical socket assembly with an integrated switch and interlock mechanism that controls energization and de-energization based on the relative positioning of the plug and socket, using a transfer mechanism with gears and cams to operate the switch, ensuring safe connection and disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plug is connected to or disconnected from an electrically energized socket, then electrical current can be supplied to the load source, but electrical arcs or sparks may occur causing explosion or fire in hazardous environments
Solution Approach 1:
The switch is operated in advance to de-energize the socket before the plug is connected or disconnected. The interlock mechanism ensures the switch is actuated first, removing electrical power from the receptacle portion, and only then can the plug be safely connected or disconnected without risk of electrical arcs or sparks
Solution Approach 2:
The interlock mechanism prevents the plug from being connected or disconnected while the socket is energized by requiring the switch to be in the off position. This preliminary anti-action blocks the harmful operation (connection/disconnection under power) before it can occur, allowing safe operation only when de-energized
2Reliability
If an interlock mechanism is added to control energization based on plug and socket positioning, then safety is improved, but device complexity increases
Solution Approach 1:
The interlock mechanism combines multiple functions into a single integrated assembly: the switch actuator, gear train, and cam are merged into one compact mechanism that automatically controls energization based on plug insertion. This reduces the need for separate control systems and minimizes the overall complexity despite the mechanical sophistication required
Solution Approach 2:
The interlock mechanism is self-actuating through the automatic operation of the switch by the plug itself. When the plug is inserted or removed, it automatically triggers the switch through the mechanical linkage, eliminating the need for external control systems, sensors, or additional actuators to manage the energization state
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 assembly reduces the risk of electrical arcs and sparks by ensuring the socket is de-energized during connection or disconnection, enhancing safety in hazardous environments.
Implementation Method 1
a first gear coupled to the shaft and a second gear coupled to the first gear. The first gear is rotatable in a first direction about the first axis based on rotation of the shaft, and the second gear is rotatable in a second direction about a second axis oriented at an angle relative to the first axis based on rotation of the first gear
Data Source
AI summary
A plug and socket assembly (100) includes a socket (110) with a receptacle portion (113) configured to receive an electrical plug (105) and an interlock mechanism (130) configured to retain the electrical plug (105) in the receptacle portion (113) when the receptacle portion (113) is rotated about a first axis to a first position. The assembly (100) includes an electrical switch (140) including an actuator (145) operable to energize and de-energize the socket (110). The assembly (100) includes a transfer mechanism (150) having a first mechanical component (310, 410) operable to transfer the rotation of the receptacle portion (113) into motion relative to the first axis that operates the actuator (145). Methods of operating a plug and socket assembly (100) are also provided.