Non-Contact Faucet Flow Detection Using Hall Effect Sensors
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Solution Overview
Problem
Conventional systems for measuring water flow in plumbing fixtures require direct contact with the fluid, leading to potential failures and difficulties in retrofitting or replacing sensors, and lack effective monitoring of hand-washing compliance in environments like hospitals and food services.
Innovation Solution
A non-contact fluid flow detection system for faucets using magnets and sensors on the handle to determine flow conditions and compliance with hand-washing routines, communicating data to a water management system for analysis and user feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct-contact flow meters are used to measure water flow, then measurement capability is achieved, but sensor failure rate increases and retrofitting difficulty increases
Solution Approach 1:
The patent replaces mechanical direct-contact flow meters with a non-contact magnetic detection system. Magnets are embedded in the faucet handle, and Hall effect sensors detect magnet position changes to infer flow conditions without physical contact with water, eliminating sensor failure from water exposure and simplifying installation.
Solution Approach 2:
The patent introduces magnets as an intermediary between the handle movement and the sensor detection. The magnets are embedded in the handle and move with it, while the sensors remain stationary and detect magnetic field changes, providing indirect measurement that avoids direct water contact for both the sensor and the moving parts.
2Reliability
If non-contact sensors are used to detect flow conditions, then sensor reliability improves and retrofitting ease improves, but measurement precision may be affected
Solution Approach 1:
The system continuously monitors magnet position through Hall effect sensors and provides real-time feedback to the controller. The controller processes sensor signals to determine handle position and flow conditions, creating a closed-loop system that maintains measurement accuracy despite the non-contact approach.
Solution Approach 2:
The patent changes the measurement parameter from direct water flow measurement to magnetic field detection. By detecting changes in magnetic field position caused by handle movement, the system indirectly measures flow conditions with high precision while maintaining sensor reliability through non-contact operation.
3Adaptability or versatility
If handle position is monitored to determine flow conditions, then hand-washing compliance monitoring is enabled, but device complexity increases
Solution Approach 1:
The magnetic detection system serves multiple functions: it detects flow conditions for water management and simultaneously monitors handle usage patterns for hand-washing compliance verification. This multi-functionality is achieved through the same sensor and controller infrastructure, reducing overall system complexity despite the expanded capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate, non-invasive measurement of water flow and hand-washing compliance without direct contact with the fluid, reducing sensor failure rates and facilitating easy retrofitting, while improving hygiene monitoring in critical environments.
Implementation Method 1
a first sensor configured to detect a position of the magnet as the handle is moved
Data Source
AI summary
A plumbing fixture assembly including a fluid flow detection system for monitoring fluid flow and flow characteristics through plumbing fixtures without contacting the fluid. The fluid flow detection system communicates collected data related to the plumbing fixtures to a water management system, which analyzes the data and provides information to a user through a portal and user interface. The fluid flow detection system also tracks users of the plumbing fixtures for compliance with a hand washing routine. The hand washing compliance data is communicated to the water management system as well.