Elliptical Gear Flowmeter Magnet Alignment and Resolution
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Solution Overview
Problem
Existing gear flowmeters have low resolution and are not suitable for precise dosing, lacking centering pins for precise magnet and sensor alignment, and do not feature circular teeth or a recess for the gear cap, which limits their precision and cleaning efficiency.
Innovation Solution
A flowmeter design with intermeshing oval gears, a central magnet, and a cap with a recessed area to align the magnet with a non-contact magnetic encoder, providing high resolution through concentric rotation and easy cleaning, along with centering pins for precise alignment and a clamp for maintenance access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional gear flowmeters are used, then the device is simple and easy to manufacture, but the measurement precision is low with only 1-4 pulses per revolution
Solution Approach 1:
The gear teeth are segmented into multiple individual teeth around the gear circumference, with each tooth generating a pulse signal. This segmentation allows the system to generate multiple pulses per revolution (over 100 pulses/rev) instead of just 1-4 pulses, dramatically improving measurement precision while maintaining the basic gear mechanism
Solution Approach 2:
The patent replaces traditional contact-based mechanical sensing with a non-contact magnetic sensing system. Magnets are embedded in the gear teeth and detected by magnetic sensors, eliminating mechanical wear and improving precision. This substitution of mechanical detection with magnetic field detection resolves the contradiction by enabling high-precision measurement without complex mechanical contact systems
2Measurement precision
If magnets are positioned in the gear without precise alignment features, then the device is easier to manufacture, but the measurement precision deteriorates due to misalignment between magnet and sensor
Solution Approach 1:
Centering pins are pre-installed in the gear body before the magnet mounting process. These pins protrude into the magnet recesses, automatically guiding and positioning the magnets during assembly. This preliminary preparation of alignment features ensures precise magnet-sensor alignment without requiring complex post-assembly adjustments, resolving the contradiction between manufacturing ease and alignment precision
Solution Approach 2:
The centering pins and magnet recesses create a self-aligning system where the magnet automatically positions itself correctly during assembly. The geometric constraints of the pin-recess interface ensure proper alignment without external intervention or complex tooling, making precise alignment achievable through simple manufacturing features
3Measurement precision
If the cap is made with uniform thickness, then the device is easier to manufacture, but the gear deforms under pressure causing measurement errors
Solution Approach 1:
The cap is designed with non-uniform thickness, featuring a thicker section specifically at the gear mounting location. This localized reinforcement provides structural support to prevent gear deformation under pressure, while other areas of the cap maintain thinner sections. This selective variation in thickness resolves the contradiction by providing structural integrity only where needed, maintaining measurement precision without unnecessarily complicating the overall manufacturing process
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
Achieves high-resolution flow measurement with over 100 pulses per revolution, ensuring accurate dosing and preventing pressure-induced deformation, while facilitating easy maintenance and cleaning.
Implementation Method 1
a magnet situated in an upper portion of the first gear and centered with respect to an axis of rotation of the first gear, and rotating concentrically with respect to the axis of rotation of the first gear
Data Source
AI summary
A flow meter, includes a casing, having a central cavity flow communication with an inlet and an outlet conduit; first and second toothed intermeshing oval gears, respectively rotatably supported in the central cavity via a primary support shaft and a secondary support shaft. The first oval gear has an upper surface provided with a protrusion and a magnet, with at least a portion of the magnet arranged within said protrusion, said magnet centered with respect to an axis of rotation of the first gear, and rotating concentrically with respect to the axis of rotation of the first gear; The flowmeter further includes a top cap having an interior cavity; in which a sensor is arranged, so that when the cap is placed on the casing of the flowmeter, the sensor or encoder is situated above the magnet of the first gear. The cap has a bottom surface with a zone of reduced thickness defining a lower recess arranged below the inner cavity of the cap, so that the projection of the first gear is received in the lower recess, so as to aligning and bring the magnet in close proximity with the sensor or encoder thereby avoiding pressure flexing.