Cooking appliance
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Solution Overview
Problem
Existing cooking appliances with induction heating elements, particularly those using ferrites for magnetic components, face inefficiencies in terms of electrical and thermal conductivity, leading to suboptimal performance and higher costs.
Innovation Solution
Incorporating an electrically conductive shielding element, preferably made of aluminum or its alloys, to shield electromagnetic fields generated by the induction heating element, along with thermal and electrical insulation elements to enhance efficiency and safety, while eliminating the need for ferrites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferrites are used as magnetic elements in induction heating appliances, then magnetic field conduction is improved, but electrical conductivity and thermal conductivity are reduced leading to inefficiency
Solution Approach 1:
The patent removes ferrites and magnetic elements from the induction heating appliance, extracting the problematic component that caused poor electrical and thermal conductivity. The shielding element is positioned at a distance from the induction heating element, eliminating the need for ferrite-based magnetic conduction while maintaining electromagnetic field management through spatial separation rather than material mediation.
Solution Approach 2:
The patent introduces a shielding element made of electrically conductive material as an intermediary between the induction heating element and the surrounding environment. This shielding element manages electromagnetic fields without requiring ferrites, acting as a mediator that provides field control while allowing efficient electrical and thermal conduction through the use of conductive materials positioned at a distance.
2Object-affected harmful factors
If ferrites are used for magnetic components, then magnetic field shielding is achieved, but device cost and weight increase
Solution Approach 1:
The patent employs a shielding element made of electrically conductive material that can be simpler and more cost-effective than ferrite-based solutions. The shielding element is positioned at a distance from the induction heating element, allowing for a lighter, potentially disposable or easily replaceable component design that reduces overall device weight and cost while maintaining electromagnetic interference shielding.
Solution Approach 2:
The patent shifts from using ferrite materials (material-based solution) to using spatial positioning (distance-based solution) for electromagnetic field management. By positioning the shielding element at a specific distance from the induction heating element, the patent solves the shielding problem in the spatial dimension rather than relying on heavy ferrite materials, thereby reducing weight and cost.
3Reliability
If ferrites are used to conduct magnetic fields, then magnetic field management is improved, but thermal behavior and heat resistance are compromised
Solution Approach 1:
The patent removes ferrites from the system, extracting the component with poor thermal behavior. By eliminating ferrites and using a shielding element positioned at a distance, the patent achieves magnetic field management without the thermal limitations of ferrite materials, allowing for better heat resistance and thermal behavior in the overall device.
Solution Approach 2:
The shielding element acts as an intermediary that manages electromagnetic fields while being positioned at a distance from the heat-generating induction heating element. This spatial separation allows the shielding element to perform its electromagnetic management function while being less affected by high temperatures, thereby improving overall thermal behavior and heat resistance of the device.
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 achieves high efficiency, cost-effectiveness, and improved thermal behavior, reducing electromagnetic interference and allowing for diverse cooking modes with efficient heating of food and muffle walls, while ensuring operator safety and compliance with electrical shielding regulations.
Implementation Method 1
at least one electrically conductive shielding element (16), which is provided to shield an electrical and/or magnetic field generated by the induction heating element (14)
Implementation Method 2
The induction heating element is intended to generate an electromagnetic alternating field, in particular with a frequency between 17 kHz and 150 kHz. The induction heating element is intended in particular to use the electromagnetic alternating field generated by the induction heating element to generate heat in at least one, in particular metallic, preferably ferromagnetic, object to be heated through eddy current induction and/or magnetic reversal effects
Implementation Method 3
generate heat in at least one, in particular metallic, preferably ferromagnetic, object to be heated through eddy current induction
Implementation Method 4
the cooking appliance device has at least one thermal insulation element, which is arranged at least partially and advantageously completely between the shielding element and the induction heating element
Data Source
AI summary
The invention relates to a cooking appliance (10), in particular an induction oven appliance, having at least one muffle wall (12) and having at least one induction heating element (14). In order to provide an appliance of the type in question having improved properties with respect to efficiency, according to the invention, the cooking appliance (10) has at least one electrically conductive screening element (16) for blocking an electric and/or magnetic field produced by the induction heating element (14).