Paddle Wheel Flow Meter Modular Magnet Assembly
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Solution Overview
Problem
Paddle wheel flow meters face challenges in accurately measuring low fluid flow rates and detecting abnormal conditions due to small magnetic field changes, and the assembly process is complex and prone to measurement errors.
Innovation Solution
The design includes a paddle wheel with disc wheels and a magnet, where the magnetic sensor generates a continuous electrical signal from the magnetic field change, allowing for accurate fluid flow measurement and detection of paddle wheel abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnets are disposed in paddles to generate magnetic field change, then fluid flow can be measured, but the assembly process becomes complicated and measurement error increases due to individual paddle magnetic field differences
Solution Approach 1:
The paddle wheel is divided into multiple independent paddles that are separately manufactured and then assembled. Each paddle can be individually tested and adjusted before assembly, simplifying the overall assembly process while maintaining measurement accuracy through modular construction.
Solution Approach 2:
Magnets are strategically positioned at specific locations on the paddles rather than uniformly distributed. This local placement optimizes the magnetic field change detection while reducing the complexity of assembling multiple magnets across all paddles, and minimizes interference between adjacent paddles.
2Measurement precision
If magnets are disposed in paddles to generate magnetic field change, then fluid flow can be measured, but measurement error increases due to difference of magnetic field generated by individual paddles
Solution Approach 1:
The magnetic field parameters are standardized by using identical magnet types, sizes, and materials across all paddles. This uniformity in magnetic parameters ensures consistent magnetic field generation while allowing for manufacturing variations through tolerance design in the paddle assembly process.
Solution Approach 2:
Magnets are pre-positioned and pre-adjusted on individual paddles during manufacturing before final assembly. This preliminary setup allows for calibration and testing of each paddle's magnetic field output, ensuring consistency across all paddles and reducing measurement errors during actual operation.
3Productivity
If magnetic sensor generates pulse signal, then fluid flow data can be obtained, but abnormal conditions of disengagement or wear cannot be determined
Solution Approach 1:
The magnetic sensor provides continuous feedback signals that are analyzed by the control unit to detect changes in pulse frequency, amplitude, or timing patterns. These feedback mechanisms enable the system to identify abnormal conditions such as paddle disengagement, wear, or obstruction while maintaining efficient data processing through real-time monitoring.
Solution Approach 2:
The magnetic sensor and signal processing system serve multiple functions: measuring fluid flow rate through pulse frequency, detecting abnormal conditions through signal pattern analysis, and monitoring system health. This multi-functionality allows a single sensing system to perform both measurement and diagnostic roles without requiring separate specialized sensors.
4Measurement precision
If paddle wheel contacts with fluid, then fluid flow can be measured, but measurement accuracy decreases when fluid flow rate is low due to small magnetic field change
Solution Approach 1:
The magnetic field generated by the magnets on the paddles is enhanced to counterbalance the weak magnetic field change signal that occurs at low flow rates. By using stronger magnets or optimizing magnetic material properties, the system maintains sufficient signal amplitude even when paddle rotation speed is low, enabling accurate measurement across a wider flow range.
Solution Approach 2:
Instead of relying solely on the magnitude of magnetic field change, the system detects paddle rotation by measuring changes in magnetic field direction or position. This dimensional approach to detection allows the sensor to accurately measure low flow rates by detecting the presence and orientation of magnets rather than depending on large field strength variations.
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
This design enhances the accuracy of fluid flow measurement and enables the detection of paddle wheel abnormalities, simplifying the assembly process and reducing measurement errors.
Implementation Method 1
the magnetic sensor generates an electrical signal by sensing a magnetic field change of the magnet
Data Source
AI summary
A paddle wheel flow meter includes a base, a paddle wheel, an axis and a magnetic sensor. The base is capable of being embedded in a fluid pipeline, and has two lugs. The paddle wheel is disposed between the two lugs, and includes paddles, two disc wheels, two bearings and at least a magnet, wherein the disc wheels are located at two opposite sides of the paddles, the bearings are respectively disposed in the disc wheels, the magnet is disposed in at least one of the disc wheels. The axis has two ends respectively fixed to the lugs through the bearings. The magnetic sensor is disposed in the base. When a fluid in the fluid pipeline drives the paddle wheel rotating, the magnetic sensor generates an electrical signal by sensing a magnetic field change of the magnet.