Fluid Flow Detection Device with Magnetic Biasing
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Solution Overview
Problem
Existing fluid flow detection devices in pipes, ducts, and conduits face premature wear due to stress, corrosion, and fatigue, and suffer from undesirable variance in activation and deactivation points caused by fluid displacement when using magnets to resist drag forces.
Innovation Solution
A fluid flow detection device with a stem and pivotally disposed paddle, utilizing magnetic forces to bias the paddle into an 'off' position, which pivots to an 'on' position upon sufficient fluid pressure, sensed by a Hall effect sensor or reed switch, allowing for adjustable magnet pull force through threaded housing to optimize flow rate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If springs or elastic materials are used to resist drag force, then the device can detect fluid flow, but the components suffer from premature wear due to stress, corrosion and fatigue failure
Solution Approach 1:
The patent replaces mechanical springs and elastic materials with a magnetic field-based system. A magnet mounted on the paddle interacts with a magnetically responsive element on the stem, creating a non-contact magnetic force that biases the paddle to the closed position. This eliminates mechanical wear from springs while maintaining the flow detection function.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the paddle and stem. Instead of direct mechanical contact through springs, the magnetic field transmits the biasing force across a gap, reducing wear and corrosion while maintaining reliable operation.
2Reliability
If magnets are used to resist drag force, then component wear is reduced, but fluid displacement causes undesirable variance in activation and deactivation points
Solution Approach 1:
The patent modifies the magnetic system parameters by adjusting the strength and positioning of magnets and magnetically responsive elements. This optimization ensures that the magnetic force provides sufficient bias without excessive fluid displacement, achieving both durability and precise, consistent activation points.
Solution Approach 2:
The patent applies magnetic materials strategically at specific locations on the paddle and stem. By concentrating magnetic force at critical interaction points rather than using bulk magnetic materials, the system achieves the necessary biasing force with minimal fluid displacement, improving both durability and measurement precision.
3Reliability
If a magnetic opener is used to bias the paddle, then wear is reduced and activation points are consistent, but the device complexity increases with additional magnetic components and sensors
Solution Approach 1:
The patent combines multiple functions into integrated components. The magnetically responsive element serves both as the biasing mechanism and as part of the sensing system. The Hall effect sensor or reed switch detects both the paddle position and the magnetic field interactions, reducing the need for separate components and simplifying the overall device.
Solution Approach 2:
The magnetic field serves multiple functions simultaneously: it provides the biasing force to keep the paddle closed, enables non-contact actuation when flow occurs, and works with the sensor to detect flow conditions. This multi-functionality reduces the number of separate components needed compared to traditional mechanical systems.
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
The solution provides reliable and durable fluid flow detection with reduced premature wear and consistent activation points, enabling precise monitoring of fluid velocity and flow rates with adjustable sensitivity.
Implementation Method 1
a magnetic opener which biases the paddle away from the stem to into an 'off' position
Implementation Method 2
which is sensed by a device such as a Hall effect sensor, reed switch, or optical sensor
Implementation Method 3
which is sensed by a device such as a Hall effect sensor, reed switch, or optical sensor
Data Source
AI summary
A fluid flow sensing device having at least a stem and a paddle portion which is pivotally disposed with the stem, and a magnetic opener which biases the paddle away from the stem to into an “off” position. Upon sufficient pressure impending on the paddle by flowing fluid to overcome the force of the magnetic opener, the paddle pivots towards the stem to an “on” position, which is sensed by a device such as a Hall effect sensor, reed switch, or optical sensor.