Field Housing Partition Wall Assembly for Ex-d Ignition Protection
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Solution Overview
Problem
The existing housing modules for field devices in measurement and automation technology face difficulties in simplifying manufacturing and maintenance while meeting ignition protection type Ex-d requirements, as screwing in a partition wall complicates the production and assembly process, increasing costs.
Innovation Solution
A housing module design with a partition wall that includes a gap surrounding the partition wall, a securing device with engagement elements and guide bodies to guide these elements into a target position, and a fastening mechanism that meets the Ex-d standard, allowing for simplified assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partition wall is screwed into the housing wall to separate housing chambers, then ignition protection type Ex-d requirements are met, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The partition wall is segmented with multiple gaps distributed around its circumference, allowing the flame arrestion function to be distributed across multiple small gaps rather than requiring a single complex threaded connection. This segmentation maintains ignition protection while simplifying the overall assembly structure.
Solution Approach 2:
The partition wall is designed with pre-formed gaps and engagement features that allow it to be inserted and secured without requiring complex threading operations. The gaps are pre-positioned to ensure proper flame arrestion, and the engagement features guide the partition wall into the correct position during assembly.
2Strength
If a partition wall is screwed into the housing wall, then secure mounting is achieved, but production costs increase
Solution Approach 1:
The mounting structure uses multiple simple engagement elements distributed around the partition wall rather than a single complex threaded connection. This distributes the mounting function across multiple simple features that are easier and less costly to manufacture.
Solution Approach 2:
The engagement elements are designed as simple, inexpensive features that can be easily manufactured into the housing wall or partition wall using standard molding or machining processes, replacing costly and time-consuming threading operations.
3Reliability
If a partition wall is screwed into the housing wall, then flame arrestion is achieved, but assembly time increases
Solution Approach 1:
The partition wall is designed with pre-formed gaps at specific positions and sizes that ensure flame arrestion functionality is built-in from the design stage. The engagement features are also pre-formed to guide rapid insertion and securing without requiring complex assembly steps.
Solution Approach 2:
The flame arrestion function is segmented into multiple gaps around the partition wall, allowing the partition to be secured quickly with simple engagement elements while maintaining effective flame containment through the distributed gap structure.
4Reliability
If the gap width to path length ratio is reduced to meet Ex-d standards, then ignition protection is improved, but the gap becomes harder to maintain within specifications
Solution Approach 1:
The total gap requirement is segmented into multiple smaller gaps distributed around the partition wall. Each individual gap can be manufactured within standard tolerances, but the cumulative effect of multiple gaps achieves the required flame arrestion performance while being more tolerant to individual variation.
Solution Approach 2:
Instead of requiring a single small gap with tight dimensional control, the design changes the parameter from a single gap dimension to multiple gap dimensions, where the sum of gap widths and total path length meets the Ex-d ratio requirement. This approach is more tolerant to manufacturing variations.
Data Source
AI summary
A housing module of a field device includes: a housing including a first housing chamber and a second housing chamber separated by a partition wall; measurement/control electronics disposed in the first housing chamber; interface electronics for connecting lines for supplying energy to the field device arranged in the second housing chamber, wherein the housing includes a first wall region to receive the partition wall, the first wall region separated from the partition wall by a gap having a path length, wherein the ratio of a gap width to the path length is less than 0.02; and a securing device for limiting a range of movement of the partition wall toward the second housing chamber, wherein the housing includes a second wall region with a groove extending parallel to a cross-sectional plane of the partition wall, the securing device including an engagement device to engage in the groove.