Explosion-Proof Plug Connector With Mixed Ignition Protection Types
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Solution Overview
Problem
Existing explosion-proof electrical connectors require significant design and structural effort for flameproof encapsulation, and often necessitate additional switches and monitoring conductors, making them complex and inefficient.
Innovation Solution
A plug connector design with contact/counter-contact pairings that utilize different types of explosion protection, where one pairing acts as an isolating switch for the other, eliminating the need for additional switches and monitoring conductors, and incorporating current and voltage limiting circuits for enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flameproof encapsulation is used for all contacts to ensure explosion protection, then safety is improved, but device complexity and structural effort increase significantly
Solution Approach 1:
The patent applies different protection types to different contact groups based on their specific functions. The first contact group (monitoring circuit) uses Ex i protection while the second contact group (main circuit) uses Ex d protection. This localized differentiation allows each contact group to have the appropriate level of protection without requiring all contacts to have the highest protection level, thereby reducing overall structural complexity while maintaining safety.
Solution Approach 2:
The connector is divided into multiple contact groups with different protection characteristics. The contact groups are separated into distinct functional units (monitoring circuit vs. main circuit) that can be designed and protected differently. This segmentation allows the system to optimize protection strategies for each segment rather than applying a uniform protection approach to all contacts.
2Reliability
If additional switches and monitoring conductors are added to achieve explosion-proof connection, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the monitoring function and the main circuit function into a single connector device with integrated contact groups. The monitoring contact group and main circuit contact group are merged into one unified structure that provides both monitoring and power connection functions simultaneously. This eliminates the need for separate monitoring devices and switches, reducing overall component count while maintaining explosion-proof functionality.
Solution Approach 2:
The connector device performs multiple functions within a single component: it provides both monitoring circuit connection (Ex i protection) and main circuit connection (Ex d protection), and also serves as the explosion-proof barrier itself. This multi-functionality eliminates the need for additional separate switches and monitoring conductors, as the connector itself fulfills all these roles.
3Reliability
If all contacts are enclosed in flameproof encapsulation, then explosion protection is ensured, but manufacturing complexity and cost increase
Solution Approach 1:
Different contact groups are assigned different protection types (Ex i for monitoring, Ex d for main circuit) based on their functional requirements. This allows manufacturing processes to be optimized for each contact group's specific protection level, rather than requiring all contacts to undergo the most stringent flameproof encapsulation process. The monitoring contact group can use simpler intrinsically safe design while only the main circuit contacts require full flameproof encapsulation.
Data Source
AI summary
The invention relates to an electrical device having a plug-in connection device (15), which is used to open and close an electrical circuit (24). The plug-in connection device (15) contains at least two contact/mating-contact pairs (22, 23), which have different ignition protection types. At least one of the two contact/mating-contact pairs is designed to interrupt the current running through said contact/mating-contact pair without triggering an explosion. (Ignition protection type Ex d or Ex i.) The other contact/mating-contact pair (23) opens and closes in the currentless state. Therefore, the other contact/mating-contact pair can have a second ignition protection type, such as Ex e.