Thermal cooking device
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Solution Overview
Problem
Conventional thermal cooking devices using a plane heater above the ceiling wall face challenges in rapidly reaching and maintaining a preset temperature in the heating compartment due to inefficient heat transfer, safety concerns, and limited power rating, leading to prolonged cooking times and inaccurate temperature control.
Innovation Solution
The thermal cooking device incorporates a plane heater with an inner and outer heater, a three-dimensionally curved ceiling wall to maintain close contact, and a controller that manages the heaters' power to ensure rapid temperature attainment and maintenance, using a heat insulator and keep plate to absorb deformation forces and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the plane heater is used to heat the ceiling wall for indirect heating of the heating compartment, then the heating efficiency is improved, but the ceiling wall experiences repeated expansion and contraction causing clearance formation and deteriorated heat transfer efficiency
Solution Approach 1:
The ceiling wall is designed with a three-dimensional curved surface that concavely faces the heating compartment, allowing the plane heater to maintain close contact throughout its entire area while accommodating thermal expansion and contraction of the ceiling wall material
2Device complexity
If the plane heater is controlled based on detected internal compartment temperature with simple on and off operation, then the control system is simple, but the preset temperature is difficult to reach with high accuracy and requires prolonged time
Solution Approach 1:
The controller detects the internal compartment temperature and controls the plane heater's on and off operations based on this detected temperature, enabling accurate maintenance of the preset temperature through continuous feedback adjustment
Solution Approach 2:
The controller dynamically adjusts the plane heater operation based on real-time temperature detection, transitioning from simple fixed on/off control to adaptive control that responds to actual temperature conditions
3Productivity
If the plane heater operates at high power to rapidly heat the heating compartment, then the heating speed is improved, but the plane heater temperature may exceed its heat resisting temperature causing safety issues
Solution Approach 1:
The controller monitors the heating process and adjusts plane heater operation based on detected internal compartment temperature, preventing the heater from exceeding its heat resisting temperature while maintaining rapid heating capability
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 allows for rapid and accurate attainment of a preset temperature within the heating compartment, reducing cooking time and ensuring consistent temperature control while adhering to rated power limits.
Implementation Method 1
the heat from the heat source of the plane heater is transmitted to the ceiling wall through the electrically insulating member, thus heating the ceiling wall
Implementation Method 2
the interior of the heating compartment is heated to the preset temperature by heat radiated by the heated ceiling wall
Implementation Method 3
the ceiling wall is caused by the heat of the plane heater to repeatedly experience expansion and contraction
Implementation Method 4
The ceiling wall of the heating compartment has a three-dimensional curved surface concavely facing the heating compartment, and the plane heater is fixed to make close contact with the ceiling wall throughout its entire area
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A thermal cooking device according to the present disclosure includes: a heating compartment in which a cooking object is heated; a plane heater provided above a ceiling wall of the heating compartment, the plane heater being one heat source formed of an inner heater disposed right above a central portion of the ceiling wall, and an outer heater surrounding the inner heater; and a controller that controls the inner heater and the outer heater of the plane heater. The ceiling wall of the heating compartment has a three-dimensional curved surface concavely facing the heating compartment. The plane heater is fixed to make close contact with the ceiling wall throughout its entire area.