Electromagnetic Flowmeter Oval Conduit Design
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Solution Overview
Problem
Conventional electromagnetic flowmeters face challenges in reducing size and weight due to increased diameter and complexity in manufacturing, particularly in forming elliptical cross-sectional flow passages and the need for additional components like yoke lids, which increase costs and assembly steps.
Innovation Solution
The electromagnetic flowmeter features a measurement conduit formed integrally from resin material with true circular end portions and an oval intermediate section, allowing coils to be arranged closely around the oblong shape, reducing magnetic losses and eliminating the need for internal linings and yoke lids, thus minimizing size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flow passage is formed with a uniform cross-sectional area from circular end portions, then the structure is simple, but the intermediate region requires an elliptical shape that increases the diameter and size of the flowmeter
Solution Approach 1:
The flow passage is divided into three distinct sections: circular end portions and an intermediate elliptical region. This segmentation allows the elliptical section to be optimized for magnetic field generation while maintaining circular end portions for simple connection, resolving the contradiction between structural simplicity and compact size.
Solution Approach 2:
Different cross-sectional shapes are applied to different regions of the flow passage. The end portions use circular shapes for simplicity and ease of connection, while the intermediate region uses an elliptical shape to optimize magnetic field generation and reduce overall size. This local differentiation resolves the contradiction by applying the appropriate geometry to each functional zone.
2Shape
If a lining is disposed on the inner circumferential surface to form an elliptical flow passage, then the flow passage shape can be changed, but the manufacturing process becomes complicated and precision is difficult to achieve
Solution Approach 1:
The elliptical flow passage shape is extracted as an integral feature of the measurement conduit itself, rather than being created by adding a separate lining. This eliminates the manufacturing complexity of lining installation while achieving the desired elliptical cross-section in the intermediate region.
Solution Approach 2:
The flow passage shaping function is merged into the measurement conduit structure itself. By forming the elliptical cross-section as an integral part of the conduit during manufacturing, the patent eliminates the need for separate linings and simplifies the manufacturing process while achieving the required geometric shape.
3Reliability
If a yoke lid is fastened to the excitation plate to surround the measurement conduit, then the magnetic circuit is improved, but the number of components and assembly steps increases
Solution Approach 1:
The yoke lid and excitation plate are merged into a single integrated component. This integration eliminates the fastening step and reduces the number of parts while maintaining the magnetic circuit performance, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The integrated yoke-excitation plate structure serves multiple functions simultaneously: it provides magnetic circuit closure, supports the excitation coils, and eliminates the need for separate lid fastening. This multi-functionality resolves the contradiction by achieving magnetic circuit improvement without increasing component count or assembly complexity.
4Loss of energy
If the excitation coils are arranged in close proximity at the intermediate region, then magnetic losses are minimized and signal is enhanced, but the measurement conduit diameter must be increased
Solution Approach 1:
The measurement conduit is designed with a locally optimized elliptical cross-section at the intermediate region where the excitation coils are positioned. This localized geometric change allows the coils to be arranged in close proximity for minimal magnetic losses while containing the overall size increase within a specific region rather than throughout the entire conduit.
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 achieves a reduction in size and weight while maintaining high precision and low power requirements for signal generation, simplifying assembly and reducing manufacturing costs.
Implementation Method 1
by energizing coils, a magnetic field is formed in a flow passage through which a fluid flows
Implementation Method 2
an electromotive force, which is generated in the fluid by the pair of electrodes
Data Source
AI summary
An electromagnetic flowmeter includes a yoke of a solenoid unit, which is accommodated in the interior of a body. The yoke is U-shaped in cross section, with a pipe unit including a measurement conduit being arranged in the interior of the yoke. One end portion and another end portion of the measurement conduit are formed with true circular shapes in cross section, whereas an intermediate portion thereof between the one end portion and the other end portion is formed with an oval shape in cross section. On the measurement conduit, cross-sectional straight line portions thereof, which are formed in the intermediate portion, are arranged in a vertical direction. Coils of the solenoid unit and excitation plates are arranged in facing relation to the cross-sectional straight line portions.