Vacuum Furnace Data Acquisition Device Thermal Management
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Solution Overview
Problem
Conventional methods for temperature measurement and data acquisition in cold wall vacuum furnaces face challenges such as fragile feed-through connectors and thermally insulating materials that outgas at high temperatures, leading to compromised vacuum integrity and limited operating temperatures.
Innovation Solution
A data acquisition device is positioned inside the vacuum furnace with a thermally conductive layer between it and the cooled internal surface, allowing direct electrical connection to sensors and eliminating the need for feed-through connectors, while a thermoelectric generator and wireless communication module enable extended operation and remote data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feed-through connectors are used to connect sensors to the data acquisition device, then electrical connection is enabled, but vacuum integrity is compromised due to fragility and leakage
Solution Approach 1:
The data acquisition device is extracted from the external environment and placed inside the vacuum furnace chamber, eliminating the need for feed-through connectors that compromise vacuum integrity. Sensors are positioned within the hot zone and directly coupled to the data acquisition device, which is mounted on the cooled internal surface of the furnace vessel wall.
Solution Approach 2:
A thermally conductive layer serves as an intermediary between the data acquisition device and the cooled internal surface, enabling both thermal management and mechanical attachment without requiring penetrations through the vessel wall that would compromise vacuum integrity.
2Reliability
If thermally insulating materials are used to protect the data acquisition device, then device protection is improved, but vacuum integrity deteriorates due to outgassing at high temperatures
Solution Approach 1:
The cooled internal surface of the furnace vessel acts as a thermal intermediary that actively manages the temperature of the data acquisition device through heat conduction, eliminating the need for thermally insulating materials that would outgas at high temperatures and compromise vacuum integrity.
Solution Approach 2:
The thermal management system replaces traditional thermally insulating materials with an active cooling approach using the cooled internal surface, substituting passive insulation with active heat dissipation that maintains vacuum integrity.
3Measurement precision
If the data acquisition device is positioned outside the vacuum furnace, then device protection is improved, but measurement accuracy deteriorates due to thermal gradient and signal loss
Solution Approach 1:
The cooled internal surface serves as a thermal intermediary that allows the data acquisition device to be positioned inside the vacuum furnace while maintaining acceptable operating temperatures through active heat dissipation, enabling direct sensor placement in the hot zone for accurate measurements.
Solution Approach 2:
The data acquisition device is mounted on the internal surface of the furnace vessel wall, utilizing the wall thickness as a thermal barrier dimension to protect the device while maintaining proximity to the hot zone for accurate temperature measurements.
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 solution maintains the data acquisition device at a stable temperature, enabling higher operating temperatures, reducing equipment downtime, and ensuring vacuum integrity by avoiding the limitations of conventional technologies.
Implementation Method 1
a thermally conductive layer arranged to provide a thermally conductive interface between a first surface of the data acquisition device and a cooled internal surface of the vacuum furnace
Data Source
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AI summary
There is provided a measurement apparatus for a vacuum furnace, comprising a data acquisition device, comprising a sensor interface operable to electrically couple one or more sensors to the data acquisition device, and a thermally conductive layer disposed on a first surface of the data acquisition device and to provide a thermally conductive interface between the first surface of the data acquisition device and a cooled internal surface of the vacuum furnace.