Field Device Case Cable Fixing Member Noise Mitigation
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Solution Overview
Problem
Existing field device configurations require complex and labor-intensive terminal processing to address noise issues in cables, particularly in remote type vortex flowmeters where cables are drawn from a deep position, leading to increased work hours and potential mistakes.
Innovation Solution
A field device case with a cable fixing member that is fixed to a shallow position relative to the opening end surface, allowing the outer shield of the cable to be pressed against a deeper inner surface, simplifying noise mitigation without the need for complicated terminal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lead-in port is disposed at a deep position away from the opening end surface to avoid overlapping the lid fitting part, then the cable can be drawn without interference, but the terminal processing becomes complicated and requires more work time
Solution Approach 1:
A cable fixing member is introduced as an intermediary component to simplify the grounding process. This fixing member includes a clamp portion that contacts the outer shield and a screw portion that fastens to the case, mediating between the deep lead-in port and the grounding requirement, thereby reducing terminal processing complexity
Solution Approach 2:
The cable fixing member is segmented into distinct functional parts: a clamp portion for contacting the outer shield, a screw portion for fastening to the case, and a connecting structure between them. This segmentation allows each part to perform its specific function efficiently, simplifying the overall terminal processing
2Ease of operation
If the lead-in port is disposed at a deep position, then cable drawing is enabled, but the terminal processing becomes complicated requiring many work man-hours and mistakes are likely to occur
Solution Approach 1:
The cable fixing member serves as a pre-fabricated intermediary assembly that encapsulates the complex terminal processing requirements. By integrating the clamp, screw, and connecting structures into a single component, it enables rapid installation without manual terminal processing, thereby improving productivity
Solution Approach 2:
The cable fixing member is pre-assembled with all necessary components (clamp portion, screw portion, connecting structure) before installation. This preliminary action eliminates the need for on-site terminal processing, reducing work man-hours and minimizing mistakes
3Ease of manufacture
If the cable fixing member is fixed to a shallow position, then the attachment is simplified and errors are reduced, but the structure requires additional components
Solution Approach 1:
Multiple functional elements (clamp portion, screw portion, connecting structure) are merged into a single cable fixing member component. This merging reduces the number of separate parts and assembly steps, simplifying manufacture and installation while adding minimal structural complexity to the case
Data Source
AI summary
A field device case is a metal field device case where a lead-in part for drawing a cable including an outer shield is provided on a tubular circumferential wall. The field device case includes: a first inner surface which is formed away from an opening end surface of the field device case in an axial direction orthogonal to the opening end surface; a second inner surface which is formed farther away from the opening end surface than the first inner surface in the axial direction; and a cable fixing member which is fixed to the first inner surface and allows the outer shield of the cable drawn by the lead-in part to be in contact with the second inner surface.