Heat Generating Body Layout for Accurate Initial Heating Control
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Solution Overview
Problem
Conventional heat-not-burn cigarette devices experience significant temperature deviations during the initial heating stage, leading to a mismatch with the planned baking temperature of tobacco, resulting in a poor smoking experience.
Innovation Solution
A heat generating body with independent heat generating and temperature measuring circuits, where the temperature measuring part is positioned in a high-temperature area to accurately reflect the overall temperature, and the heat generating wire width varies in different temperature zones to enhance temperature control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional heat generating body is used, then the device can generate heat to bake tobacco, but the temperature deviates significantly from the planned temperature in the initial heating stage
Solution Approach 1:
The heat generating body is divided into distinct functional areas: a heat generating area with heating wires and a separate electrode arrangement area. The temperature measuring part is specifically positioned in the high-temperature area, while the heat generating electrode is positioned in the electrode arrangement area, creating spatial separation of measurement and control functions to improve temperature control accuracy.
Solution Approach 2:
The patent implements a feedback control system where the temperature measuring circuit continuously monitors the temperature in the high-temperature area and provides feedback to control the heating process. This allows the system to adjust the heating power in real-time to maintain the desired temperature, reducing deviation from the planned temperature during initial heating.
2Reliability
If the temperature measuring part is positioned away from the heat generating area, then the measurement is safer, but the temperature reflection is less accurate
Solution Approach 1:
The temperature measuring part is strategically positioned in the high-temperature area where the actual heating occurs, rather than being placed remotely. This localized positioning ensures that the temperature measurement accurately reflects the conditions in the heat generating area, improving measurement precision while maintaining reliability through proper circuit isolation.
3Ease of manufacture
If the heat generating wire has uniform width, then the manufacturing is simpler, but the temperature distribution is less controlled
Solution Approach 1:
The heat generating wire is designed with non-uniform width, featuring a first section with a first width and a second section with a second width. This variable cross-section allows different parts of the wire to generate different amounts of heat, enabling precise control over the temperature distribution in the heat generating area. The wider section generates more heat while the narrower section generates less, creating an optimized thermal profile.
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
The solution ensures more precise temperature control in the initial heating stage, reducing deviations between actual and planned temperatures, thereby improving the smoking experience.
Implementation Method 1
the heat generating part comprising a heat generating wire
Implementation Method 2
the temperature measuring circuit including a temperature measuring part and a temperature measuring electrode electrically connected to the temperature measuring part
Data Source
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AI summary
A heat generating body (100, 200), a heat generating assembly (10, 20) and a heating device. The heat generating body (100, 200) comprises a base body (110, 210), a heat generating circuit (130, 230) and a temperature measuring circuit (150, 250). The base body (110, 210) is provided with a bottom surface (115), the base body (110, 210) is provided with a heat generating area (119, 319) and an electrode arrangement area (117) adjacent to the heat generating area (119, 319), and the electrode arrangement area (117) is close to the bottom surface (115) compared with the heat generating area (119, 319); the heat generating circuit (130, 230) is located on the base body (110, 210), and the heat generating circuit (130, 230) comprises a heat generating part (131, 231) and a heat generating electrode (133, 233) electrically connected to the heat generating part (131, 231), the heat generating part (131, 231) being located in the heat generating area (119, 319), and the heat generating electrode (133, 233) being located in the electrode arrangement area (117); the temperature measuring circuit (150, 250) is located on the base body (110, 210), the temperature measuring circuit (150, 250) and the heat generating circuit (130, 230) are arranged spaced apart, and the temperature measuring circuit (150, 250) comprises a temperature measuring part (151, 251, 351) and a temperature measuring electrode (153, 253) electrically connected to the temperature measuring part (151, 251, 351); and the heat generating area (119, 319) comprises a high-temperature area (119a), and the temperature measuring part (151, 251, 351) is located in the high-temperature area (119a). In an initial heating stage of the heat generating body (100, 200), the deviation between an actual temperature and a planned temperature is small.