Optical Gear Flow Meter Sealed Chamber Design
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Solution Overview
Problem
Traditional gear flow meters face challenges with fluid leakage through shaft apertures, limited resolution due to magnetic field interference, and high costs associated with sealing mechanisms, especially when used with aggressive liquids or for small-scale applications.
Innovation Solution
A gear flow meter with a sealed chamber and an optical sensor positioned outside to view rotating gears through a transparent wall, allowing for precise measurement of fluid volume, flow rate, and direction without direct fluid contact, reducing the need for complex sealing mechanisms and minimizing mechanical parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic sensors are used to measure gear rotation, then the measurement can be performed through a sealed chamber, but magnetic field interference limits the resolution especially for small meter resolutions (less than 0.5 ml)
Solution Approach 1:
The patent replaces magnetic sensors with an optical detection system that uses a light source and photodetector to detect gear rotation through the transparent chamber wall. This substitution eliminates magnetic field interference entirely, enabling high-resolution measurements (less than 0.5 ml) while maintaining the sealed chamber configuration.
Solution Approach 2:
The patent changes the detection parameter from magnetic field interaction to optical interaction. By using the transparency of the chamber wall and optical properties of the gear (reflective markings or inherent refraction), the system achieves higher measurement precision without the limitations of magnetic sensor resolution.
2Ease of operation
If shaft apertures are provided in the chamber cover for coupling gears to external timing gears, then gear rotation can be measured, but fluid leakage occurs through these apertures which decreases measurement precision and wastes fluid
Solution Approach 1:
The patent replaces the mechanical shaft aperture coupling system with an optical detection system that views the gears through the transparent chamber wall. This eliminates the need for shaft apertures entirely, maintaining a fully sealed chamber that prevents fluid leakage while still enabling gear rotation measurement.
Solution Approach 2:
The transparent chamber wall serves as an intermediary that allows optical detection of gear rotation without requiring physical openings. The light passes through this intermediary medium, enabling measurement while maintaining the seal integrity of the chamber.
3Reliability
If magnets are sealed within the gears to protect from aggressive liquids, then the chamber can be sealed, but complicated sealing mechanics are required which increase cost and difficulty of implementation
Solution Approach 1:
The patent replaces the magnetic sensing system with an optical system that detects gear rotation through the transparent chamber wall. This eliminates the need for sealed magnets within the gears, removing the complicated sealing mechanics entirely while maintaining chamber sealing for aggressive liquids.
Solution Approach 2:
The patent extracts the detection function from inside the sealed chamber (where magnets would require sealing) and places it outside the chamber. The optical sensor views the gears through the transparent wall, removing the need for any sealed magnetic components within the chamber.
4Reliability
If transparent chamber wall is used for optical sensor viewing, then sealed chamber is maintained without shaft apertures, but the wall material must be substantially transparent to the optical sensor wavelength
Solution Approach 1:
The patent applies the transparency requirement only to the specific region of the chamber wall where optical detection occurs. The transparent wall portion is positioned at the sensor viewing location, while other portions of the chamber can use different materials optimized for chemical compatibility with the measured fluid. This localized approach maintains sealing while enabling optical detection.
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 accurate and precise fluid measurement with reduced leakage, fewer mechanical breakdowns, and easier fabrication, enabling high-resolution measurements even at small scales without the limitations of magnetic sensors.
Implementation Method 1
An optical sensor positioned outside of the chamber, views the rotating gears through a substantially transparent chamber wall. The optical sensor can view an optical characteristic of one or both of the gears
Data Source
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Figure 3A~3B
Figure 4A~4B
AI summary
Embodiments of the invention provide devices and methods for measuring fluid volume. Devices according to some embodiments include a chamber, having a pair of gears rotatably mounted therewithin. Fluid flow through the chamber causes rotation of the gears, such that each rotation and/or partial rotation results in a known volume of the fluid passing through the chamber. An optical sensor positioned outside of the chamber, can view the rotating gears through a substantially transparent chamber wall. The optical sensor can view an optical characteristic of one or both of the gears, and based upon this data, fluid volume, flow rate, and/or flow direction can be determined. Devices and methods disclosed herein can provide for improved precision in fluid flow meter measurement. In addition, the devices and methods used herein can be more durable and easier to fabricate than previously known positive displacement flow meters.