Adjustable Electrode Flowmeter for Three-Orthogonal Velocity Measurement
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Solution Overview
Problem
Existing electromagnetic flowmeters face challenges in accurately measuring liquid flow velocity due to the rigid fixation of magnetic coils and electrodes, which can interfere with the flow and limit the measurement accuracy, especially when trying to capture three orthogonal velocity components.
Innovation Solution
The electromagnetic flowmeter design separates the magnetic coil assembly from the electrodes, placing the coils outside the liquid flow passage and using adjustable, orthogonally arranged electrode pairs on a probe strut to measure velocity components, with optional Hall-effect devices for enhanced accuracy, allowing for the measurement of three orthogonal components by alternately energizing collinear and orthogonally displaced coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic coils and electrodes are rigidly fixed together in prior art designs, then the device structure is simple and easy to manufacture, but the electrodes and magnetic coil assembly interfere with the flow and limit measurement accuracy
Solution Approach 1:
The device is divided into separate functional modules: the magnetic coil assembly is separated from the electrode assembly. The coils are positioned outside the liquid flow passage while electrodes extend into the flow on an adjustable probe strut. This segmentation eliminates flow interference while maintaining measurement capability.
Solution Approach 2:
The magnetic coil assembly is extracted from the flow path and positioned externally. Only the minimal necessary electrodes extend into the liquid flow on an adjustable probe, removing the harmful magnetic assembly from the flow while preserving the electromagnetic induction function.
2Measurement precision
If electrodes are rigidly fixed in prior art designs, then the device structure is simple, but the measurement accuracy is limited especially for three orthogonal velocity components
Solution Approach 1:
The electrode assembly is made adjustable rather than fixed. The probe strut allows electrodes to be positioned at different locations and orientations within the flow, enabling measurement of three orthogonal velocity components by alternately energizing collinear and orthogonally displaced coils.
Solution Approach 2:
The electrode arrangement extends into the third dimension with orthogonal positioning. Multiple electrode pairs are arranged orthogonally on the adjustable probe strut, allowing measurement of velocity components in three orthogonal directions (x, y, z axes).
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 minimizes flow obstruction and enhances measurement accuracy by allowing for the precise detection of three orthogonal velocity components, improving the overall accuracy of liquid flow velocity measurement while maintaining a minimal impact on the flow.
Implementation Method 1
at least one electromagnet coil arranged outside a liquid flow passage for generating an electromotive force in the liquid flow
Implementation Method 2
a Hall-effect device may be provided on the probe
Data Source
AI summary
An electromagnetic flowmeter includes at least one electromagnet coil arranged outside a liquid flow passage for generating an electromotive force in the liquid flow, and at least one pair of electrodes adjustably extending within the liquid flow for generating a velocity component signal. Preferably, two collinearly arranged coils are provided externally on opposite sides of the liquid flow passage, and a first set of two orthogonally-arranged pairs of coplanar electrodes are mounted on an adjustable probe strut that extends into the liquid flow. For greater accuracy, a Hall-effect device is provided on the probe. Additional sets of electrode pairs may be secured to the strut in planes parallel to the first electrode set. A second pair of collinear coils may be mounted externally of the liquid passage and orthogonally relative to the first coil pair, the two pairs of coils being alternately energized to produce three orthogonally arranged velocity components.