Tool-Free Coupler for Duct Detector Sampling Tubes
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Solution Overview
Problem
Existing duct-type detectors require cumbersome and time-consuming installation processes, often necessitating the use of tools and specialized equipment, and are prone to moisture ingress which can cause malfunctions due to condensation accumulation.
Innovation Solution
A coupler design that allows for tool-free, quick installation of sampling tubes with visual alignment indicators and integral features for secure attachment, including flexible snaps, threaded connections, and press fits, which also directs condensation away from the detector enclosure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional fasteners or welding are used to attach sampling tubes to detector housings, then secure attachment and proper alignment are achieved, but installation becomes time-consuming and requires specialized equipment
Solution Approach 1:
The coupling device is divided into separate modular components: a coupling member with attachment features and a detector housing with corresponding receiving features. This segmentation allows the sampling tube to be attached to the coupling member independently, then quickly connected to the detector housing without requiring welding or complex fastening operations, thereby reducing installation time while maintaining secure attachment.
Solution Approach 2:
The coupling device serves as an intermediary component between the sampling tube and the detector housing. It provides standardized interface features that facilitate easy connection and disconnection, eliminating the need for specialized welding equipment or complex fastener installation, thus reducing installation time and equipment requirements while ensuring secure attachment.
2Strength
If formed flanges or tabs are used to couple conduits to detector housings, then secure attachment is achieved, but specialized production equipment is required increasing cost
Solution Approach 1:
The coupling device integrates multiple functions into a single component: it provides attachment features for the sampling tube, alignment features for proper orientation, and connection interfaces for the detector housing. This merging eliminates the need for separate formed flanges or tabs that would require specialized punching and forming equipment, simplifying production while maintaining secure attachment.
Solution Approach 2:
The coupling device is designed as a universal component that can accommodate different sampling tube configurations and detector housing types through standardized interface features. This multi-functionality eliminates the need for specialized production equipment for each specific application, reducing manufacturing complexity and cost while ensuring secure attachment across various configurations.
3Ease of operation
If the detector cover must be removed to install sampling tubes, then access to fasteners is gained, but installation time and effort increase
Solution Approach 1:
The attachment mechanism is extracted from the detector housing and integrated into the coupling device itself. This allows the sampling tube to be attached to the coupling member independently of the detector housing assembly, eliminating the need to remove the detector cover to access fasteners, thereby reducing installation time while maintaining ease of operation.
4Ease of operation
If sampling tubes are installed in wrong position, then repositioning is needed, but cover must be removed again adding time
Solution Approach 1:
The coupling device incorporates dynamic attachment features that allow for easy adjustment and repositioning of the sampling tube. The modular design with standardized interfaces enables the sampling tube to be quickly detached and reattached in different positions without requiring removal of the detector cover, facilitating easy repositioning while minimizing time loss.
Data Source
AI summary
A duct detector includes sampling tubes which slidably engage the detector with a fixed orientation to facilitate fluid flow. The tubes have a connector portion and a conduit portion. The connector portion and the conduit portion engage one another with a predetermined orientation.