Measuring Probe Shield for Molten Metal Sampling
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Solution Overview
Problem
Existing molten metal sampling probes, such as those used in steel converters, face interference from gas bubbles and slag particles, which hinder accurate sampling due to direct exposure of the inlet opening, leading to faulty samples.
Innovation Solution
A protective shield is positioned outside the inlet channel, at a distance from the inlet opening, to divert gas bubbles and slag particles away from the sample chamber, ensuring that only molten metal enters, while being more resistant to molten steel than the protective cap and designed to allow lateral entry, enhancing sample quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inlet opening is directly exposed to the molten metal, then the sampling process is simple and fast, but gas bubbles and slag particles enter the sample chamber causing faulty samples
Solution Approach 1:
A protective shield is introduced as an intermediary component between the inlet opening and the molten metal environment. The shield has a specific geometry with a curved front surface that deflects gas bubbles and slag particles away from the inlet opening, while allowing molten metal to enter laterally. This mediator protects the sample chamber from contaminants without completely blocking the inlet.
Solution Approach 2:
The protective shield utilizes three-dimensional spatial arrangement to solve the problem. Instead of a simple linear blockage, the shield is positioned at an angle and extends laterally, creating a protective zone in 3D space. The shield's curved surface and lateral positioning create flow patterns that separate contaminants from the metal flow in different spatial dimensions.
2Reliability
If a protective shield is added to divert gas bubbles and slag, then sample quality improves, but the device structure becomes more complex
Solution Approach 1:
The protective shield serves multiple functions simultaneously: it deflects gas bubbles, redirects slag particles, protects the inlet opening, and guides molten metal flow into the sample chamber. By combining these functions into a single component, the design avoids adding multiple separate protective devices that would increase complexity further.
Solution Approach 2:
The shield's geometry parameters (curvature radius, angle, thickness, positioning distance) are optimized to achieve effective protection while minimizing structural complexity. The curved surface radius and angle are specifically designed to create beneficial flow patterns without requiring overly complex shapes or multiple components.
3Reliability
If the protective shield is positioned close to the inlet opening, then protection against gas bubbles is effective, but the opening for molten metal entry is reduced
Solution Approach 1:
The protective shield features a curved front surface with an optimized radius of curvature. This spherical/circular geometry allows the shield to be positioned close to the inlet opening for effective protection while the curved shape naturally guides molten metal flow around it and into the lateral entry opening, maximizing the effective entry area.
Solution Approach 2:
The shield creates periodic or alternating flow patterns where molten metal flows laterally around the shield while gas bubbles are deflected in different directions. This flow separation pattern ensures continuous metal entry while maintaining protection, effectively managing the trade-off between proximity and entry area.
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 effectively prevents gas bubbles and slag from entering the sample chamber, resulting in pore-free and high-quality samples, even during oxygen and inert gas blowing processes, improving the reliability of molten metal analysis.
Implementation Method 1
The protective cap is a common protective cap that melts or dissolves when the probe is immersed in the molten metal, exposing the inlet port for the sample chamber
Implementation Method 2
the protective shield covering the inlet opening and with the protective shield not completely surrounding the inlet channel laterally, the gas bubbles present in the molten metal, which caused, among other things, by blowing in oxygen in a converter, not directly in front of the protective cap of the inlet opening and thus not into the sample chamber after the protective cap has melted, but are diverted from the protective shield
Data Source
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AI summary
The measuring probe (8) has measuring head (9) that is arranged at immersion end of carrier tube. The measuring head is provided with sample chamber which is provided with inlet passage. The end of inlet passage is provided with inlet opening covered with protective cap. The inlet opening is protruded from carrier tube facing away from front side of measuring head. A protective shield arranged at outside of inlet passage in feed direction is provided for covering inlet opening. The inlet passage is not completely surrounded by the shield made of metal, ceramic and quartz.