Flow-Channel Sensor Cooling for High-Temperature Reliability
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Solution Overview
Problem
Existing sensors, such as semiconductor sensors with pn junctions and reed switches, face operational limitations when exposed to temperatures exceeding their maximum operating temperature, leading to potential malfunction and reduced reliability in high-temperature environments.
Innovation Solution
A sensor configuration with a first and second flow channel for fluid circulation that cools the sensor elements, using inert gas or coolant to maintain the sensor elements at a lower temperature than the surrounding environment, and optionally incorporating a protection tube with low thermal conductivity materials to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the sensor is exposed to high temperature environment to enable operation in vaporizer, then the sensor can function in the required environment, but the sensor element temperature exceeds its maximum operating temperature causing malfunction
Solution Approach 1:
The sensor system is divided into two thermal zones: the sensor element is isolated in a cooler zone while the vaporizer operates in a high-temperature zone. The protection tube and flow channels create separate thermal environments, allowing the sensor to be protected from direct exposure to high temperatures while still functioning in the required environment.
Solution Approach 2:
A cooling fluid (inert gas) is introduced as an intermediary medium between the high-temperature vaporizer environment and the sensor element. The fluid flows through flow channels to actively cool the sensor element, acting as a thermal buffer that allows the sensor to operate reliably while the vaporizer maintains high temperatures for vaporization.
2Temperature
If a protection tube with low thermal conductivity material is used to cool the sensor element, then the sensor element temperature is reduced, but the device structure becomes more complex
Solution Approach 1:
The protection tube serves multiple functions simultaneously: it provides mechanical protection for the sensor element, acts as a thermal insulation barrier due to its low thermal conductivity material, and serves as a flow channel for the cooling fluid. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The sensor element is nested within the protection tube, which itself is nested within the vaporizer housing. The flow channels are integrated within the protection tube structure. This nested arrangement allows compact integration of multiple protective and cooling functions without proportionally increasing overall device complexity.
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 elements are maintained at a lower temperature, allowing continuous operation beyond their maximum operating temperature, thereby enhancing reliability and extending the lifespan of the sensor in high-temperature conditions.
Implementation Method 1
a first flow channel that is a flow channel which delivers cooling fluid from outside the sensor to a position of the sensor element; and a second flow channel that is a flow channel which returns the cooling fluid delivered to the position of the sensor element by the first flow channel to outside the sensor
Data Source
AI summary
A sensor comprising one, two or more sensor elements; a first flow channel that is a flow channel which delivers fluid from the outside of the sensor to a position of the sensor element; and a second flow channel that is a flow channel which returns the fluid delivered to the position of the sensor element by the first flow channel to the outside of the sensor. The sensor may comprise a protection tube having one end closed and the other end open, and the sensor elements may be located inside the protection tube. In this case, the sensor elements are located in at least one of the first flow channel or the second flow channel. At least one of a member of the first flow channel and a member of the second flow channel may have a lower thermal conductivity than a member of the protection tube.