Dry Block Calibrator Handle Cooling via Segmented Airflow
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Solution Overview
Problem
Existing portable dry block temperature calibrators suffer from excessive heat dissipation issues, causing high temperatures near the furnace opening that can damage sensors in tested devices due to inefficient airflow direction and cooling mechanisms.
Innovation Solution
The integration of air flow generating devices, including flow guiding fans and gas passages, directs cooled air specifically towards the handle of the device to be tested, effectively reducing the temperature and preventing sensor damage by creating a controlled directional airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is disposed at the bottom of the furnace body to generate air flow from bottom to top in the heat dissipation passage, then cooling and heat dissipation inside the furnace body is achieved, but the temperature of the gas flowing out of the heat dissipation passage is excessively high, causing damage to sensors inside the handle of the tested device
Solution Approach 1:
The heat dissipation passage is divided into two separate passages: a first heat dissipation passage for cooling the furnace body and a second heat dissipation passage for cooling the handle. This segmentation allows independent temperature control and airflow management for each region, preventing hot gas from reaching the sensors while maintaining effective cooling where needed.
Solution Approach 2:
A guide plate is introduced as an intermediary component to redirect the airflow. The guide plate is disposed at the outlet of the first heat dissipation passage to guide the air flow into the second heat dissipation passage, ensuring that cooled air is directed toward the handle area rather than allowing hot gas to escape directly.
2Loss of energy
If the constant temperature block and the heat insulation layer are spaced apart to form a heat dissipation passage, then heat dissipation is achieved, but the airflow direction is not controlled, resulting in excessive heat near the furnace opening
Solution Approach 1:
Different regions of the furnace body are provided with different heat dissipation characteristics. The first heat dissipation passage is designed for general furnace body cooling, while the second heat dissipation passage is specifically designed to address the local heat problem near the handle and furnace opening. This localized approach ensures appropriate temperature control in each region.
Solution Approach 2:
The guide plate serves as a mediator to control and redirect the airflow from the first heat dissipation passage into the second heat dissipation passage. This intermediary component ensures that the airflow follows the intended path and directs cooled air to the areas that need cooling most, preventing excessive heat accumulation near the furnace opening.
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 significantly reduces the temperature of the handle and sensors near the furnace opening, from 133 degrees to 48 degrees at higher fan speeds, ensuring the safety and accuracy of temperature calibration processes.
Implementation Method 1
An air flow generated by the cooling fan disposed at the bottom of the furnace body flows from bottom to top in the heat dissipation passage, thereby achieving cooling and heat dissipation inside the furnace body
Implementation Method 2
The constant temperature block and the heat insulation layer are spaced apart by a certain distance to form a heat dissipation passage C1
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A flow guiding and heat dissipating type dry block temperature calibrator, which belongs to the temperature calibration field. The temperature calibrator comprises a furnace body (1) located in a housing (6) and at least one air flow generating device. The air flow generating device is provided on one side or at the periphery of the furnace body (1), and is one or a combination of a gas passage C2, a flow guiding fan (21), an air pump and a blower. The air flow generated by the air flow generating device is blown toward a handle (91) of a device being tested (9) that is inserted in the furnace body (1), such that the handle (91) is cooled, thereby preventing the sensor inside the handle (91) from failing due to high temperature, facilitating the heat dissipation of the internal electronic components of the instrument itself, and extending the service life of the temperature calibrator.