Inductive Cooker Glass Plate Cooling via Magnetic Rod
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Solution Overview
Problem
Induction cookers face challenges in effectively cooling the ceramic glass surface, which can become uncomfortably hot and affect touch sensors due to inadequate heat dissipation, especially with prolonged use.
Innovation Solution
An inductive cooking device with a hollow layer filled with a cooling liquid beneath the glass plate and induction coils, where a movable rod within this layer directs the liquid flow through inlets to facilitate passive cooling, utilizing the magnetic field generated by the induction coils to move the rod and circulate the cooling liquid efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling devices with pumps are used, then cooling effectiveness is improved, but device complexity increases
Solution Approach 1:
The cooling system uses the magnetic field generated by the induction coils to automatically move the rod and circulate the cooling liquid without requiring external pumps or control mechanisms. The system serves itself by utilizing its own operational energy (magnetic field) to drive the cooling function.
Solution Approach 2:
The patent replaces the traditional mechanical pump system with a magnetic field-driven rod movement mechanism. The magnetic field generated during induction cooking directly actuates the rod to pump cooling liquid, eliminating the need for separate mechanical cooling components.
2Loss of energy
If cooling liquid circulation is improved, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The induction coils serve dual functions: generating magnetic fields for cooking and driving the rod to circulate cooling liquid. This multi-functionality eliminates the need for separate cooling system components, reducing overall device complexity while maintaining effective heat dissipation.
Solution Approach 2:
The cooling system is merged with the cooking system by using the same magnetic field generation mechanism to drive both cooking and cooling functions. The rod movement and cooling liquid circulation are integrated into the existing induction cooking infrastructure.
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 provides effective passive cooling for the ceramic glass surface, reducing heat transfer and maintaining sensor functionality by efficiently dissipating heat without the need for complex active cooling systems, ensuring user safety and device reliability.
Implementation Method 1
a high frequency power signal is provided to an induction coil. This generates a magnetic field around the induction coil, which is magnetically coupled to a conductive or ferromagnetic cooking vessel, such as a pan, placed over the induction coil. The magnetic field then generates eddy currents in the cooking vessel, causing the cooking vessel to heat.
Implementation Method 2
the hollow layer is flooded or filled with a cooling liquid... if the glass plate heats up, e.g. because of a hot cooking vessel being positioned on the glass plate for an increased amount of time, the heat may transfer from the glass plate to the cooling liquid.
Data Source
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AI summary
The present invention provides an inductive cooking device (100, 200) comprising a glass plate (101, 201) for carrying a number of cooking vessels (237), a number of induction coils (106, 107, 108, 109, 235, 236) arranged under the glass plate (101, 201), a control unit (110) configured to control a current (111) through the induction coils (106, 107, 108, 109, 235, 236) depending at least on a predefined power level (112), a hollow layer (115) filled with a cooling liquid (225), the hollow layer (115) being arranged under the glass plate (101, 201) and above the induction coils (106, 107, 108, 109, 235, 236) and comprising a first liquid inlet (116, 216) on a first frame side (117) and a second liquid inlet (118, 218) on a second frame side (119), wherein the first frame side (117) is opposite to the second frame side (119), and a rod (120, 220) arranged inside of the hollow layer (115) movable from the first frame side (117) to the second frame side (119). Further, the present invention provides a respective method.