Bidirectional Flow Switch with Magnetic Sensors
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Solution Overview
Problem
Existing bidirectional flow switches are either complex and expensive or susceptible to external interference, making them unsuitable for applications requiring cost-effective and reliable detection of fluid flow in both directions.
Innovation Solution
A bidirectional flow switch design featuring a housing with magnetic sensors and a movable body with an elastic member and magnet, which changes state in response to fluid flow in both directions, minimizing pressure drop and allowing for flexible circuit configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If continuous sensing devices (paddle wheel meters or ultrasonic meters) are used for bidirectional flow sensing, then bidirectional flow detection capability is achieved, but device complexity and cost increase
Solution Approach 1:
The device uses two separate magnetic sensors positioned at different locations to detect flow in opposite directions independently, rather than using a single complex continuous sensing device. This segmentation allows bidirectional detection while maintaining simplicity of individual sensor components.
Solution Approach 2:
A magnet attached to the movable body acts as an intermediary that interacts with both magnetic sensors. The magnet's position relative to the two sensors provides information about flow direction and magnitude, enabling bidirectional detection through a simple magnetic field interaction mechanism.
2Adaptability or versatility
If continuous sensing devices with electronic circuitry are used for bidirectional flow sensing, then bidirectional flow detection capability is achieved, but susceptibility to external electrical interference increases
Solution Approach 1:
The invention replaces complex electronic continuous sensing circuitry with a simpler magnetic field-based detection system. Two magnetic sensors detect the position of a magnet mechanically coupled to the flow-responsive body, providing bidirectional detection through magnetic field interactions rather than sophisticated electronic signal processing.
3Productivity
If a paddle wheel meter is used for flow sensing, then continuous flow measurement is achieved, but the device becomes susceptible to damage from high flow rates
Solution Approach 1:
The invention extracts the essential function of flow detection from the complex rotating wheel mechanism. Instead of using a paddle wheel that must physically rotate, the design uses a magnet attached to a movable body that responds to flow forces, eliminating the vulnerable rotating components while retaining the ability to detect flow direction and magnitude.
4Productivity
If paddle wheel meters are used for flow sensing, then continuous flow measurement is achieved, but sophisticated circuitry is required to respond to magnet movement frequency
Solution Approach 1:
The invention replaces the rotating wheel with magnets that require frequency-based circuitry with a simpler system where a single magnet's position is detected by two magnetic sensors. This eliminates the need for sophisticated circuitry to interpret rotation frequency, as the magnetic sensors directly provide positional information about flow direction and magnitude.
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 design provides a cost-effective and reliable method for detecting bidirectional fluid flow, minimizing pressure drop and accommodating various flow rates while reducing susceptibility to external interference.
Implementation Method 1
A magnet is attached to the body so that the magnet is movable with the body in the passage in the first flow direction and in the second flow direction... causing relative movement between the magnet and the magnetic sensors that causes the magnetic sensors to change state
Implementation Method 2
An elastic member is disposed between the housing and the body so that the elastic member biases the body to a first position when no fluid flows through the passage
Data Source
AI summary
A bidirectional flow switch includes a housing having a flow passage therethrough. A body is disposed movably in the flow passage and biased towards a first position at zero flow. A magnetic sensor is disposed proximate the housing. A magnet is disposed with respect to the body and the magnetic sensor so that when the body is at the first position, the magnetic sensor is at a first state and so that the magnetic sensor is at a second state when a flow rate through the flow passage is greater than a threshold flow rate that moves the body from the first position.