Cam Fastening Device for Explosion-Proof Enclosure Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Securing the cover of an explosion-proof enclosure to its body is time-consuming and requires multiple bolts, which can lead to insufficient sealing and loss of explosion-proof integrity if not properly torqued, especially in harsh environments where oxidation may cause the cover and body to fuse together.
Innovation Solution
The use of a fastening device with engagement features that maintain a flame path between the top and bottom flanges of the enclosure, allowing for efficient coupling and decoupling while ensuring compliance with explosion-proof standards, and featuring beveled edges to reduce the gap and material requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple bolts (30 or more) are used to secure the cover to the body, then the sealing reliability is improved, but the time required for securing and removing the cover increases significantly
Solution Approach 1:
The enclosure is divided into a body portion and a cover portion that can be separated. The fastening device includes a first portion attached to the body and a second portion attached to the cover, allowing the cover to be removed as a single unit without manually manipulating multiple individual bolts, thus reducing the time for assembly and disassembly while maintaining sealing integrity through the integrated fastening system.
2Reliability
If multiple bolts are used to secure the cover, then the explosion-proof integrity is improved, but the complexity of the fastening system increases
Solution Approach 1:
Multiple fastening functions are merged into an integrated fastening device system comprising a first portion on the body and a second portion on the cover. This consolidation maintains the explosion-proof integrity through multiple engagement points while simplifying the overall system by providing a unified fastening mechanism that can be operated as a single unit rather than managing numerous separate bolts.
3Reliability
If the cover and body are tightly sealed, then the explosion-proof integrity is maintained, but the fastening force required increases
Solution Approach 1:
The fastening device employs a cam mechanism that converts rotational motion into linear clamping force. As the cam is rotated, its profile progressively increases the clamping force on the sealing interface, allowing for controlled application of high fastening force only when needed for sealing, while enabling easy release by reversing the rotation, thus managing force requirements dynamically rather than requiring continuously high force.
Data Source
AI summary
An enclosure can include a top enclosure portion having a top flange and a first top engagement feature. The enclosure can also include a bottom enclosure portion mechanically coupled to the top enclosure portion, where the bottom enclosure portion has a bottom flange that mechanically couples to the top flange and a first bottom engagement feature that mechanically couples to the first top engagement feature. The enclosure can further include a first fastening device mechanically and movably coupled to the first top engagement feature and the first bottom engagement feature. The first fastening device, in an engaged position, can maintain a flame path between the top flange and the bottom flange. The first fastening device, in a disengaged position, can fail to maintain a flame path between the top flange and the bottom flange.