Explosion-Proof Housing Screw Connection with Threaded Pin
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Solution Overview
Problem
Conventional pressure-resistant housings for electronic devices in explosive environments are either too large or cannot be easily opened for maintenance due to their robust construction, making them unsuitable for mobile devices.
Innovation Solution
A housing design featuring a screw connection with a threaded pin and bush configuration that creates an 'ex-gap' to reduce explosive energy below ignition threshold, allowing for a releasable and secure connection between housing parts, enabling miniaturization and easy removal of electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional robust construction is used for pressure-resistant housings in explosive environments, then explosion protection is improved, but housing size increases and maintenance becomes difficult
Solution Approach 1:
The housing is divided into multiple parts that can be separately assembled and disassembled. The first and second housing parts can be separated to access the electronic device for maintenance, while each part maintains pressure resistance when assembled together with the ex-gap configuration.
Solution Approach 2:
The ex-gap (explosive gap) acts as an intermediary element between the housing interior and exterior. This gap, created by the threaded pin and bush configuration, prevents explosion pressure transmission while allowing a compact design that wouldn't require overly robust construction.
2Reliability
If conventional robust construction is used for pressure-resistant housings in explosive environments, then explosion protection is improved, but ease of maintenance deteriorates
Solution Approach 1:
The housing is segmented into separable parts connected by a screw connection mechanism. This allows the housing to be disassembled for maintenance and reassembled for explosion protection, combining ease of repair with reliability.
Solution Approach 2:
The housing transitions from a static sealed structure to a dynamic system that can be opened and closed. The screw connection with ex-gap maintains explosion protection when closed but allows easy access when opened.
3Reliability
If ex-gap requirements are met in screw connection, then explosion protection is improved, but device complexity increases
Solution Approach 1:
The threaded bush and pin configuration serves multiple functions: it provides the required ex-gap for explosion protection, enables screw connection for assembly, and maintains structural integrity. This multi-functionality reduces overall system complexity despite the specialized requirements.
Data Source
AI summary
A housing for receiving an electronic device in an explosive atmosphere may include a first housing part and second housing part coupled to one another via at least one screw connection defining a housing interior for receiving the electronic device. The screw connection may include a screw and a separate threaded pin. A recess may be defined in first housing part. A first threaded bush may be arranged in the recess for receiving the screw. A through-opening may be defined in the second housing part concentric to the recess and a second threaded bush may be arranged in the through-opening for partially receiving the screw and the threaded pin. The screw may be arranged in the through-opening and screwed into the first threaded bush coupling the first housing part and the second housing part to one another. The threaded pin may be screwed into the second threaded bush.