Explosion-Proof Electrical Connector with Arc Containment
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Solution Overview
Problem
Existing electrical connectors fail to meet stringent safety standards in explosive atmospheres, particularly in preventing sparks from being transmitted to the surrounding environment when connector parts are separated while still energized, as required by IEC 60079 standards.
Innovation Solution
A connector design featuring inter-engageable parts with electrically insulating contact holders and shrouds that protect contacts from inadvertent contact, allowing them to remain live during separation, and providing a delay in separation to extinguish any arc or spark within the connector structure, ensuring safety even when both parts are connected to a source of energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If connector parts are separated while energized to allow continuous operation, then operational continuity is improved, but spark transmission risk increases
Solution Approach 1:
The connector is divided into separate plug and socket elements that can be disconnected while maintaining safety through flameproof enclosure. Each element is independently contained within its own flameproof housing, allowing separation without transmitting sparks to the external environment.
Solution Approach 2:
The potential harmful effect of sparks generated during separation is converted into a contained phenomenon. The flameproof enclosure captures and contains any sparks or arcs that may occur during energized separation, preventing them from igniting the external explosive atmosphere while still allowing operational continuity.
2Reliability
If mechanical interlocking is implemented to prevent separation when energized, then safety is improved, but ease of operation deteriorates
Solution Approach 1:
The connector employs a dynamic locking mechanism that adapts its state based on operational conditions. The mechanical interlock provides rigid prevention of separation when energized, but can be dynamically disengaged when de-energized, allowing flexible operation while maintaining safety during critical periods.
3Ease of operation
If contacts are exposed for easy connection, then ease of operation is improved, but risk of inadvertent contact increases
Solution Approach 1:
The electrical contacts are nested within the flameproof connector elements, which serve as protective enclosures. The contacts are not directly exposed to the external environment but are contained within the interengageable plug and socket housings, providing both ease of connection through standard interfaces and protection against inadvertent contact.
4Reliability
If separation time delay is introduced to extinguish arcs, then safety is improved, but productivity deteriorates
Solution Approach 1:
The flameproof enclosure is pre-configured to provide immediate arc quenching upon separation initiation. The enclosure design inherently provides the necessary time delay for arc extinction without requiring external control systems or deliberate delays, as the physical structure itself ensures rapid containment and extinction of any arcs generated during separation.
Data Source
AI summary
A connector for interconnecting or mutually isolating two or more electrical circuits is provided. The connector comprises first and second inter-engageable connector parts. A first part comprises a spigot and first contact pins for connection to an electrical circuit. The second connector part comprises a socket and second contact pins for connection to an electrical circuit. The second part has a lock ball projecting into the socket. The first part defines a groove for receipt of the lock ball. The first contact holder has a first shroud disposed around the first contact pins. The first shroud extends beyond the first contact pins. The second contact holder has second shrouds disposed around the each second contact pin. The second shrouds extends beyond the second contact pins. The contact holders are arranged such that when the spigot is received in the socket, the connector parts are moveable between a first position and a second position.