Combined Sensor Thermistor Housing Segmentation
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Solution Overview
Problem
Existing combined sensors for detecting pressure and temperature have low temperature responsiveness due to the thermistor being covered with a metal member, leading to high heat transfer and radiation issues.
Innovation Solution
A combined sensor design with a thermistor unit housed in a housing portion closer to the flow path, featuring a through hole and extension part that separates the leads, allowing the thermistor to be exposed outside and improving heat transfer and responsiveness by reducing radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the thermistor is covered with a metal member as a whole, then the heat transfer property is improved, but the temperature responsiveness deteriorates due to radiation and thermal mass
Solution Approach 1:
The housing portion is divided into a first housing part and a second housing part that are separated from each other, creating gaps and flow holes between them. This segmentation allows the detection medium to flow directly around the thermistor from multiple directions, improving temperature responsiveness while maintaining adequate heat transfer through the structured gaps.
Solution Approach 2:
The patent creates different thermal environments in different regions: the thermistor is exposed to direct fluid flow in gaps for high responsiveness, while still being housed in a structured environment that provides stable mounting and electrical connections. The flow holes and gaps are strategically positioned to optimize local heat transfer zones around the thermistor.
2Strength
If the thermistor is covered with a metal member, then structural protection is improved, but temperature measurement accuracy deteriorates due to thermal radiation and heat capacity
Solution Approach 1:
The housing is segmented into multiple parts with intentional gaps, providing structural support while avoiding complete enclosure. This allows the thermistor to remain structurally protected by the housing framework while being thermally exposed to the detection medium through the gaps and flow holes.
Solution Approach 2:
The housing structure incorporates flow holes and gaps that function similarly to porous structures, allowing fluid penetration and direct thermal contact with the thermistor while maintaining the structural integrity of the housing material itself.
3Measurement precision
If the thermistor is positioned closer to the flow path, then temperature detection capability is improved, but thermal interference with pressure detection may occur
Solution Approach 1:
The housing is divided into distinct first and second housing parts that separately accommodate the thermistor and pressure sensor. This segmentation creates thermal zones and fluid flow channels that allow the thermistor to be positioned near the flow path for accurate temperature detection while the pressure sensor remains in a separate zone, minimizing thermal interference between the two measurement 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
Enhances temperature responsiveness and measurement accuracy by allowing direct contact with the detection medium and reducing thermal resistance, enabling precise temperature detection of flowing and stagnant media.
Implementation Method 1
a temperature detector that detects a temperature of the detection medium using a thermistor
Implementation Method 2
a temperature detector that detects a temperature of the detection medium using a thermistor
Data Source
AI summary
Provided is a combine sensor including a pressure sensor module as a pressure detector, a thermistor unit as a temperature detector, a housing portion housing the temperature detector closer to a flow path than the pressure detector. The temperature detector includes a thermistor case where a first lead and a second lead connected to a thermistor are partially embedded. The thermistor case includes an extension part and a ring part including a flow hole part. The thermistor is supported by the extension part to be arranged outside an opening end. The extension part is provided by being separated into a portion where the first lead is embedded and a portion where the second lead is embedded, along an extending direction of the extension part, and includes a space portion communicating with the flow hole part and the outside.