Electromagnetic Averaging Sensor Assembly with Adaptive Isolation
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Solution Overview
Problem
Existing flowmeters for measuring fluid velocity in pipes and open channels suffer from limitations such as sensitivity to debris, non-linearity, accuracy issues, and the need for specific conduit sizes, making them unsuitable for varying pipe sizes and water levels.
Innovation Solution
An electromagnetic averaging insertion sensor with isolated electrodes, using a tubular shape and isolation means to maintain position, allowing measurement in a range of pipe sizes and open channels with varying fluid levels, by isolating electrodes not exposed to the fluid flow to avoid inaccurate readings and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single sensor design is used for multiple conduit sizes, then device complexity is reduced and versatility is improved, but measurement precision deteriorates due to electrode signals from non-immersed electrodes
Solution Approach 1:
The patent implements a movable isolation tube that can be dynamically positioned along the sensor body to adapt to different conduit sizes and water levels. The isolation tube's position is adjusted based on the specific application requirements, allowing the same sensor to maintain measurement precision across varying conditions by dynamically isolating appropriate electrodes.
Solution Approach 2:
The isolation tube serves as an intermediary element between the electrodes and the external environment. It selectively isolates electrodes that should not be immersed in the fluid, preventing them from generating erroneous signals while allowing necessary electrodes to remain exposed, thus maintaining measurement precision across different conduit sizes.
2Measurement precision
If electrodes are isolated to improve measurement accuracy, then measurement precision is improved, but device complexity increases due to isolation mechanisms
Solution Approach 1:
The isolation tube functions as a flexible shell that can be moved along the sensor body to provide isolation when needed. This approach maintains measurement precision by isolating specific electrodes while avoiding the complexity of permanently complex isolation structures, as the tube can be simple and adaptable.
Solution Approach 2:
The isolation tube is designed to be self-positioned through friction forces in open channel applications, reducing the need for complex mechanical fixing mechanisms. In closed pipe applications, the isolation tube can be mechanically fixed with simple means, allowing the system to self-adjust or self-isolate based on the application type without requiring complex control systems.
3Reliability
If mechanical fixing is used for the isolation device in closed pipes, then reliability is improved, but ease of operation deteriorates due to installation complexity
Solution Approach 1:
In open channel applications, the isolation tube utilizes friction forces to maintain its position automatically without requiring additional mechanical fixing mechanisms. This self-positioning capability simplifies installation and operation while maintaining reliability, as the tube naturally stays in place during measurement.
4Ease of operation
If friction-based positioning is used in open channels, then ease of operation is improved, but reliability deteriorates due to potential slippage
Solution Approach 1:
The isolation tube is designed to self-position and self-maintain its position through friction forces in open channel applications. The friction between the isolation tube and the sensor body is sufficient to keep the tube in place during normal operation, providing both ease of operation (no complex fixing needed) and adequate reliability for the intended application conditions.
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 sensor provides accurate and reliable average velocity measurements across varying conduit sizes and water levels, reducing signal noise and calibration drifts, and maintaining measurement accuracy without requiring specific conduit size adaptations.
Implementation Method 1
In open channel applications the friction force from the isolating seals is sufficient to maintain it in place
Implementation Method 2
electromagnetic averaging insertion sensor... measuring the mean velocity of fluid flowing in a conduit
Data Source
AI summary
A sensor assembly is for measuring average velocity of a fluid flowing in a closed conduit or in an open channel. The sensor assembly is adapted to measure average velocity though closed conduits of different sizes or through open channels with different fluid levels. The sensor assembly includes a housing extending across an inside of the closed conduit or to extend vertically in the section of the open channel. The housing includes pairs of electrodes and at least one associated electromagnet for measuring the velocity distribution in the closed conduit or in the open channel. An isolator allows isolation from the pairs of electrodes or from signals of the pairs of electrodes that are not in contact with the fluid flow to be measured. The isolator is configured to be adapted depending on water level in the open channel or size of the closed conduit.