Physical Quantity Measuring Device Cable Routing
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Solution Overview
Problem
Existing physical quantity measuring devices face challenges in easily connecting cables due to obstacles from attachment targets and scoring issues during cover attachment, which complicates the wiring operation and stability of the device.
Innovation Solution
A physical quantity measuring device design featuring a synthetic resin inner case with a case threaded portion and a cover with a different hardness, allowing easy cable connection by inserting the cable into a cable drawing portion and guiding it to a terminal base, while the cover's opposite orientation and seal members prevent water ingress and reduce scoring risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the neck is elongated to avoid pipes disturbing the wiring operation, then the wiring operation becomes easier, but the device stability deteriorates
Solution Approach 1:
The device is divided into an outer case and an inner case, with the terminal base integrated into the inner case. This segmentation allows the inner case to be positioned away from the neck base, providing clear wiring space without requiring neck elongation, thus maintaining device stability while facilitating wiring operations.
2Reliability
If all components (chassis, outer plate, cover) are made of metal for corrosion resistance, then corrosion resistance is improved, but scoring occurs during cover attachment which complicates wiring operation
Solution Approach 1:
The inner case is made of synthetic resin while the outer case and cover are made of metal. This composite material approach maintains corrosion resistance from the metal outer components while the resin inner case prevents scoring during cover attachment, facilitating easier wiring operations.
3Reliability
If the cover is attached to the housing body in a direction orthogonal to the neck axial direction, then the cover can be properly secured, but pipes at the neck base disturb the wiring operation
Solution Approach 1:
The terminal base is integrated into the inner case, which is nested within the outer case. This nested structure positions the terminal base away from the neck base, eliminating pipe interference with wiring operations while maintaining proper cover attachment to the outer case.
Data Source
AI summary
A physical-quantity-measuring device includes: an outer-case including a bottom and a cylindrical body; a synthetic-resin-made inner-case provided inside the outer-case; a detector that detects a physical quantity; a terminal base including a terminal for transmitting a signal from the detector outward; a cover covering an opening of the outer-case and being different in hardness from the inner-case; a cable whose first end is connected to the terminal; and a cylindrical-cable-drawing portion drawing a second end of the cable and projecting from a circumferential surface of the outer-case. The inner case includes: a case threaded-portion; and a terminal-base-setting portion on which the terminal base is set. The detector includes: a bottom connector connected to the bottom; and a joint attachable to a target. The cover includes: a cover body covering the terminal-base-setting portion; and a cover threaded-portion provided to the cover body and screwable with the case threaded-portion.