Flameproof Housing Transparent Panel Mechanical Seal
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Solution Overview
Problem
Existing flameproof housings for vibrating conduit sensors, such as Coriolis mass flowmeters, face challenges with curable sealing materials that are costly, environmentally hazardous, and prone to leakage or improper application, which can compromise the flameproof seal and lead to safety issues in hazardous environments.
Innovation Solution
A flameproof housing design featuring a transparent panel with precise tolerances and a spigot joint interface that eliminates the need for curable sealing materials, ensuring a secure and flameproof seal through a combination of perimeter and face gaps that meet predetermined flamepath length standards, using a seal groove and resilient seal to prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If curable sealing materials (potting material or adhesive) are used to seal the glass panel to the housing, then the glass panel is sealed and bonded to the housing, but the sealing material may shrink and crack with age, lose adhesion, and cause leakage
Solution Approach 1:
The invention extracts and eliminates the curable sealing material from the flameproof housing assembly, replacing it with a mechanical seal interface between the glass panel and housing that does not rely on adhesives or potting compounds. This removes the source of shrinkage, cracking, and adhesion loss over time.
Solution Approach 2:
The seal interface is segmented into distinct functional zones: a flame path region with controlled gap dimensions for flame containment, and a mechanical attachment region for securing the glass panel. This segmentation allows each region to be optimized independently for its specific function without compromise.
2Ease of manufacture
If curable sealing materials are used to seal the glass panel, then the glass panel is sealed to the housing, but the sealing material requires heating or other processes to cure and may be improperly or incompletely applied
Solution Approach 1:
The glass panel and housing are designed with pre-formed seal surfaces and geometric features that establish the flame path dimensions before assembly. The mechanical interface is configured in advance to maintain precise gap dimensions, eliminating the need for post-assembly curing processes and ensuring consistent seal quality.
3Reliability
If the housing is sealed off with a flameproof design, then flame propagation is prevented, but display components must remain externally visible creating a sealing challenge
Solution Approach 1:
The glass panel interface is designed with locally differentiated zones: a central transparent region for display visibility and a peripheral sealing region with controlled gap dimensions for flame path containment. This local quality differentiation allows the same component to simultaneously provide optical access and flameproof sealing without additional complexity.
Data Source
AI summary
A method for forming a flameproof transmitter is disclosed. The transmitter includes a flameproof housing including an interior surface, a display aperture and a shoulder adjacent to the aperture at first end of the housing. A transparent panel including an outer face and a perimeter is inserted into the housing from a second end to threadingly engage a fastener feature located on the interior surface of the housing such that the fastener element contacts the transparent panel and retains the transparent panel against the shoulder. A perimeter interface region between the perimeter of the transparent panel and the interior surface of the flameproof housing creates a perimeter gap that does not exceed a predetermined flameproof gap limit and a face interface region between the outer face of the transparent panel and the shoulder creates a face gap that does not exceed the predetermined flameproof gap limit.