Molten Metal Level Sensor Using Multi-Point Temperature Compensation
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Solution Overview
Problem
Existing molten metal level measurement technologies face challenges in accurately measuring fine changes in liquid level and reliability due to temperature changes and thermal expansion in high-temperature environments, particularly in long-range applications, where temperature compensation is inadequate and uncertainty in measured values is high.
Innovation Solution
A molten metal level measuring device using a cylindrical bobbin with a helically wound liquid level measuring part, a circular inner cylinder, and multiple thermocouples extending in the axial direction, which allows for multi-point temperature measurement and temperature compensation to improve accuracy and reliability, integrated with a control unit to output corrected liquid level measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a discontinuous electrode-type method is used for liquid level measurement, then the structure is simple, but fine changes in liquid level cannot be measured unless the number of measuring devices is infinitely increased
Solution Approach 1:
The measuring rod is divided into multiple segments with different electrical conductivity characteristics. Each segment responds to liquid level changes, enabling continuous measurement through a single device rather than requiring multiple discrete sensors.
Solution Approach 2:
The patent changes the electrical conductivity parameter along the length of the measuring rod by using segments with different materials or structures. This allows the single measuring device to detect fine liquid level changes through variations in conductivity patterns rather than requiring multiple identical sensors.
2Measurement precision
If a continuous-type liquid level meter using inductive current is used, then continuous measurement is achieved, but temperature compensation is inconvenient when changes in property values due to temperature change frequently occur
Solution Approach 1:
The patent introduces temperature compensation rods as intermediary elements that are thermally coupled to the measuring rod but electrically isolated. These compensation rods experience the same temperature changes and expand/contract accordingly, providing a reference signal that automatically compensates for temperature effects without requiring manual intervention.
Solution Approach 2:
The temperature compensation system operates automatically through thermal expansion and contraction of the compensation rods. The system self-adjusts for temperature changes without requiring external control or manual calibration, making the measurement process self-compensating.
3Length of moving object
If the length of the liquid level meter increases for long-range measurement, then the measurement range is extended, but uncertainty in measured values increases due to thermal expansion of the structure
Solution Approach 1:
Temperature compensation rods serve as intermediary reference elements that are distributed along the length of the measuring rod. These rods experience the same thermal expansion as the main structure but provide a known reference pattern that allows the system to calculate and correct for expansion-induced measurement errors.
Solution Approach 2:
The patent explicitly utilizes thermal expansion of both the measuring rod and compensation rods. By designing the system to account for the predictable expansion behavior of materials at high temperatures, the patent converts the harmful effect of thermal expansion into a useful reference signal for compensation calculations.
4Measurement precision
If a single-point temperature measurement is used, then the device structure is simple, but temperature compensation cannot satisfy detailed temperature information according to liquid level change
Solution Approach 1:
The temperature measurement system is segmented into multiple measurement points along the length of the rod. Each segment has its own temperature sensor, allowing the system to capture temperature variations at different heights and provide detailed temperature information corresponding to different liquid level positions.
Solution Approach 2:
The measuring rod serves multiple functions: it acts as both the liquid level sensing element and the mounting structure for temperature sensors. This multi-functionality allows temperature measurements at multiple points without significantly increasing device complexity, as the same structural element provides both measurement and sensor support functions.
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 solution enables precise and reliable continuous measurement of molten metal levels across long ranges, minimizing uncertainty and ensuring accurate liquid level data even in high-temperature environments, with improved separation characteristics and reduced risk of leaks in thermal systems.
Implementation Method 1
a liquid level measuring part helically wound around an outer surface of the bobbin
Implementation Method 2
a plurality of thermocouples disposed extending in the axial direction in the space formed by the outer side of the inner cylinder and the inner side of the protective tube
Data Source
AI summary
A molten metal level measuring device in a continuous molten metal level measuring device uses temperature compensation. The device includes a cylindrical bobbin, a liquid level measuring unit helically wound around an outer surface of the bobbin, a circular inner cylinder in which the bobbin and the liquid level measuring part are located and which seals the bobbin and the liquid level measuring part from the outside and has the same axial direction as the bobbin, and a cylindrical protective tube in which the inner cylinder is located and which has the same axial direction as the bobbin and has one open end. Thermocouples extend axially in the space between the inner cylinder and the protective tube, and a control unit controls the liquid level measuring part to measure a liquid level of the molten metal based on the temperatures measured by the thermocouples.