Heating device and refrigerator with heating device
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Solution Overview
Problem
Existing electromagnetic wave heating devices for thawing food suffer from uneven heating due to differences in microwave penetration and absorption, leading to inaccurate temperature judgment and difficulties in cutting the thawed food.
Innovation Solution
A heating device equipped with a cylinder body, a door body, an electromagnetic generating system, and a temperature sensing device that uses signal sensing and processing parts to determine the average temperature of the food, allowing for accurate judgment of the heating progress and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electromagnetic wave heating is used to thaw food, then heating speed is improved, but temperature uniformity deteriorates due to uneven microwave penetration and absorption
Solution Approach 1:
The patent implements a feedback control system using a temperature sensing device that detects the average temperature of the food and provides real-time feedback to the control unit. The control unit adjusts the electromagnetic wave generation based on this feedback, ensuring uniform heating while maintaining fast heating speed. This resolves the contradiction by continuously monitoring and adjusting the heating process to prevent localized overheating.
Solution Approach 2:
The patent changes the parameter being monitored from surface temperature (conventional infrared sensing) to average temperature (using dielectric coefficient changes). By measuring the average temperature through electromagnetic wave interaction with the entire food volume, the system achieves better temperature uniformity control while maintaining efficient heating.
2Device complexity
If conventional infrared sensor is used to sense food temperature, then device complexity is reduced, but measurement precision deteriorates due to inability to accurately judge thawing progress
Solution Approach 1:
The patent replaces the conventional infrared temperature sensor with a temperature sensing device based on dielectric coefficient measurement. This substitution uses electromagnetic field interaction to measure the average temperature of the entire food volume, providing more accurate thawing progress judgment while maintaining reasonable device complexity.
Solution Approach 2:
The patent introduces the dielectric coefficient as an intermediary parameter to indirectly measure the average food temperature. Instead of directly measuring temperature at specific points, the system measures the dielectric coefficient changes caused by temperature variations, providing more accurate and comprehensive temperature assessment.
3Productivity
If electromagnetic wave heating is applied to frozen food, then heating efficiency is improved, but harmful factors increase due to production of bloody water and excessive local heating
Solution Approach 1:
The feedback control system continuously monitors the average food temperature and adjusts the electromagnetic wave generation accordingly. When the food reaches the desired thawing state, the system automatically stops heating, preventing overheating that would cause bloody water production and other harmful effects, while maintaining high heating efficiency throughout the process.
Solution Approach 2:
The patent applies electromagnetic wave heating at full power for the necessary duration to achieve efficient thawing, then stops exactly when the average temperature reaches the target range. This controlled partial action ensures maximum heating efficiency is utilized without excessive heating that would create harmful byproducts.
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 device ensures accurate and uniform heating, preventing the production of bloody water and achieving a suitable shear strength in the thawed food, making it easier to cut.
Implementation Method 1
an electromagnetic generating system, at least a part of which is disposed in the cylinder body or accessed into the cylinder body, so as to generate electromagnetic waves in the cylinder body to heat an object to be processed
Implementation Method 2
a signal sensing part, configured to sense specific parameters of an incident wave signal and a reflected wave signal in the cylinder body
Data Source
AI summary
A heating device (100) includes a cylinder body (110) provided with a pick-and-place opening, a door body (120) configured to open and close the pick-and-place opening, an electromagnetic generating system, at least a part of which is disposed in the cylinder body (110) or accessed into the cylinder body (110), and a temperature sensing device. The temperature sensing device includes a signal sensing part (171) and a processor (172), wherein the signal sensing part (171) is configured to sense specific parameters of an incident wave signal and a reflected wave signal in the cylinder body (110), and the processor (172) is configured to judge whether an average temperature of the object to be processed is in a specific temperature interval according to the specific parameters. A more accurate overall average temperature can be obtained, and the heating progress of the object to be processed can be judged more accurately.