Thermal Analysis Apparatus Weight Detector Temperature Control
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Solution Overview
Problem
The detection accuracy of weight detectors in thermal analysis apparatuses is reduced due to the adverse effects of heat from the heating furnace, which generates a magnetic field that interferes with the measurement process.
Innovation Solution
A thermal analysis apparatus is designed with a resistance heater that maintains the weight detector at a constant temperature using an electric current of 6 A or less, reducing the magnetic field noise and incorporating a heating furnace cover and weight detector cover to prevent heat transfer and enhance airflow for better temperature control, ensuring the weight detector remains at 50° C or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heating furnace operates at high temperature, then the heating function is improved, but magnetic field noise increases and affects weight detector accuracy
Solution Approach 1:
The apparatus is divided into two separate chambers: a heating chamber for high-temperature heating and a detection chamber for weight measurement. The heating furnace and weight detector are spatially segmented to prevent magnetic field interference from the heating furnace from affecting the weight detector's measurement accuracy.
Solution Approach 2:
A non-magnetic connecting portion is introduced as an intermediary between the heating furnace and weight detector. This connecting portion allows thermal energy transfer while being made of non-magnetic material to prevent magnetic field noise from reaching the weight detector, thus mediating between the heating function and measurement accuracy requirements.
2Stability of the object's composition
If a heater is used to maintain weight detector temperature, then temperature stability is improved, but magnetic field noise is generated
Solution Approach 1:
The patent employs a low-power heater (6A or less) that generates minimal magnetic field noise compared to high-power heating elements. This low-power heater is sufficient for maintaining temperature stability of the weight detector without generating significant magnetic interference, effectively using a 'weaker' heating solution where appropriate.
Solution Approach 2:
Different regions of the apparatus have different heating requirements. The weight detector region uses a low-power heater for minimal magnetic field generation, while the main heating furnace uses high-power heating. The heater for the weight detector is specifically designed with local quality considerations to provide just enough thermal stability without excessive magnetic field generation.
3Use of energy by stationary object
If the weight detector is positioned closer to the heating furnace, then thermal efficiency is improved, but heat interference with detection increases
Solution Approach 1:
A non-magnetic, thermally conductive connecting portion serves as an intermediary between the heating furnace and weight detector. This connector allows efficient thermal energy transfer to maintain the weight detector at appropriate temperature while being positioned far enough and constructed in a way that minimizes magnetic field interference from the heating furnace.
Solution Approach 2:
The apparatus segments the heating and detection functions into separate spatial zones connected by a specialized interface. The heating furnace operates independently in one zone, the weight detector operates in another zone, and they are connected through a non-magnetic bridge that allows thermal coupling while preventing magnetic interference.
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 increases measurement accuracy by minimizing magnetic field interference and maintaining the weight detector at a stable temperature, resulting in a TG signal noise width of 0.2 μg or less, thereby improving the overall detection precision.
Implementation Method 1
a resistance heater, which is arranged to cover the weight detector, and is to be energized by an electric current of 6 A or less
Implementation Method 2
the weight detector is configured to allow an electric current to flow through a coil attached to the lever to generate an electromagnet
Data Source
AI summary
A thermal analysis apparatus includes: a cylindrical heating furnace extending in an axial direction; a weight detector arranged on a rear-end side in the axial direction of the cylindrical heating furnace and including levers extending in the axial direction to detect a weight; a connecting portion for connecting the cylindrical heating furnace and the weight detector to communicate an internal space of the cylindrical heating furnace with an internal space of the weight detector and positioning the levers from the weight detector into the cylindrical heating furnace; sample holding portions connected to tip ends of the levers and arranged inside the cylindrical heating furnace and holding a sample; resistance heaters arranged to cover the weight detector and energized by an electric current of 6 A or less; and a heater control part for controlling an energization state of the resistance heaters to maintain the weight detector at a constant temperature.