Curved Float Oil Level Sensing for Irregular Reservoirs
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Solution Overview
Problem
In gas turbine engines, measuring the oil level in irregularly shaped reservoirs is challenging due to constrained access, making direct observation difficult and requiring precise remote measurement techniques to avoid overfilling.
Innovation Solution
A curved oil level measuring device with an arcuate support structure and a float guided along this structure, combined with an electrical sensor, such as a magnetic field strength or capacitance sensor, that allows for remote measurement of oil quantity, and an optional camera system for visual confirmation through a communications channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direct observation methods are used to measure oil level, then measurement simplicity is improved, but accessibility to the measurement location deteriorates due to constrained space in irregularly shaped reservoirs
Solution Approach 1:
The patent introduces a float as an intermediary element that transmits the oil level information from the inaccessible reservoir interior to the accessible exterior. The float moves with oil level changes and carries a magnet that interacts with reed switches mounted outside the reservoir, enabling indirect measurement without direct access to the measurement location.
Solution Approach 2:
The patent replaces direct mechanical observation with a magnetic field-based sensing system. Instead of requiring physical access to view or measure the oil level directly, the system uses magnetic coupling between the float-mounted magnet and external reed switches to detect and transmit level information wirelessly through the reservoir wall.
2Difficulty of detecting and measuring
If remote measurement techniques are used to avoid direct access, then accessibility requirement is improved, but measurement precision deteriorates near maximum fill levels
Solution Approach 1:
The patent divides the measurement range into multiple discrete segments using equally spaced reed switches along the float's travel path. Each reed switch corresponds to a specific oil level threshold, providing segmented but precise measurement points throughout the reservoir height, including accurate detection near maximum fill levels.
Solution Approach 2:
The reed switches are pre-positioned at predetermined heights corresponding to specific oil level thresholds before the measurement process begins. This preliminary configuration ensures that measurement points are strategically placed to capture critical levels including the maximum fill level, enabling accurate detection without requiring complex real-time calculations.
3Adaptability or versatility
If the reservoir is formed in unconventional shapes to fit confined locations, then installation adaptability is improved, but measurement accessibility deteriorates
Solution Approach 1:
The float acts as a mediator that bridges the inaccessible interior of irregularly shaped reservoirs and the accessible exterior environment. It converts the complex three-dimensional oil level changes within irregular geometry into simple linear vertical motion that can be detected by external sensors, regardless of the reservoir's shape.
Solution Approach 2:
The magnetic field-based measurement system provides universal applicability to reservoirs of any shape or size. The same float-magnet and reed switch configuration can measure oil levels in regularly shaped tanks as well as irregularly shaped reservoirs constrained by engine geometry, eliminating the need for shape-specific measurement solutions.
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
Enables accurate remote measurement of oil levels in confined spaces, reducing the need for direct access and minimizing measurement errors near maximum fill levels, ensuring precise fluid management and continuous supply to the engine.
Implementation Method 1
a float (22) adapted to move along the support structure in response to changes in the liquid level
Implementation Method 2
an electrical sensor, such as a magnetic field strength or capacitance sensor
Implementation Method 3
an electrical sensor, such as a magnetic field strength or capacitance sensor
Data Source
AI summary
An apparatus and method of determining the level of a liquid in a reservoir having curved surfaces is described, where the measuring device comprises a support having a radius of curvature conformable to the curvature of the reservoir. A float assembly is captivated to the support so that it may move freely in the vertical direction, but is constrained in rotation with respect to the support by compatible asymmetrical structural features. The float assembly includes an element that can be sensed by a sensor assembly that is positioned along the support over the length of the support encompassing the range of fluid levels to be measured.