Heat Radiation-Resistant NTC Sensor Rod Design
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Solution Overview
Problem
Existing NTC temperature sensors face issues with poor thermal conductivity and inaccurate measurements due to heat radiation from surrounding sources, as the thermistor is not in close contact with the housing and epoxy resin filling methods fail to ensure effective thermal isolation.
Innovation Solution
The design incorporates a heat radiation-resistant measurement rod with a thermal insulation rubber pad and a metal part embedded in an injection-molded part, ensuring close contact between the thermistor and the measurement rod, and using a spring for elastic contact with the object, while the injection-molded part isolates heat radiation, preventing interference with temperature measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thermistor is filled and sealed in an ordinary metal housing by using epoxy resin, then the housing provides structural support and electrical insulation, but the thermistor cannot be in close contact with the inner side of the housing, resulting in poor thermal conductivity
Solution Approach 1:
The patent uses a composite structure combining metal housing with high-thermal-conductivity thermal paste or thermal conduction rubber between the thermistor and housing inner wall. This composite material approach simultaneously provides structural support, electrical insulation, and enhanced thermal conductivity, resolving the contradiction between mechanical reliability and thermal measurement precision.
Solution Approach 2:
The patent introduces thermal paste or thermal conduction rubber as an intermediary substance between the thermistor and the metal housing inner wall. This intermediary material fills the gaps and ensures intimate thermal contact while maintaining electrical insulation, thereby improving thermal conductivity without compromising the structural and electrical functions of the metal housing.
2Measurement precision
If the NTC temperature sensor measures a temperature of an object, then the sensor detects the object temperature, but heat radiated by heat sources around the object to be measured affects the measurement result, resulting in inaccurate measurement
Solution Approach 1:
The patent extracts and isolates the thermistor from the direct path of heat radiation by positioning it within the measurement rod structure. The measurement rod with its specific geometry and material properties shields the thermistor from external heat radiation sources, allowing accurate temperature measurement of the target object without interference from surrounding thermal environments.
Solution Approach 2:
The patent applies local quality enhancement by using materials with specific thermal properties in different regions of the sensor. The measurement rod and housing use materials optimized for thermal conduction in the direction of measurement while providing thermal isolation from directions where heat radiation interference occurs, thereby improving measurement precision by addressing different thermal pathways locally.
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
This configuration ensures quick temperature reflection and accurate measurements by maintaining close contact with the object and effectively isolating heat radiation, enhancing thermal conductivity and measurement accuracy.
Implementation Method 1
the heat radiation-resistant measurement rod has the thermal insulation rubber pad adhered thereon
Implementation Method 2
NTC temperature sensors are sensors which perform temperature measurements using a principle that a resistance of a conductor or a semiconductor varies as its temperature varies
Implementation Method 3
the metal upper cover has an electrical insulation film or an electrical insulation body attached on an inner side thereof
Data Source
AI summary
A heat radiation-resistant NTC temperature sensor comprises a measurement rod which is in contact with a plane of an object to be measured. A cavity for accommodating a thermistor is provided in an axial direction of the measurement rod, and the thermistor is in close contact with an upper wall of the cavity of the measurement rod. The thermistor is connected to an external detection device through a wire. The temperature sensor can be used for temperature measurement of a pan bottom, and it has an accurate temperature measurement and a high reaction speed, and it can prevent surrounding heat radiation from affecting the temperature measurement.