Heating cooker using ceramic heating element and manufacturing method therefor
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Solution Overview
Problem
Existing microwave cooking technologies face limitations in generating high-temperature heat, leading to food drying and explosion issues with shelled items, and conventional heating elements have low heat resistance and durability, requiring long cooking times and posing safety concerns.
Innovation Solution
A ceramic heating cooker with a heating element made from mill scale, steelmaking slag, or magnetite, using a colloidal silica sol as an inorganic binder, which is applied to the cooker body and cured at a lower temperature, providing excellent adhesion and heat resistance, and capable of withstanding high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicone rubber is used as a binder for ferrite in the heating element, then the heating element has good adhesion and is easy to produce, but the heat-resistant temperature is limited to about 250°C and the silicone rubber burns and smokes at high temperatures
Solution Approach 1:
The patent changes the binder material from organic silicone rubber to inorganic colloidal silica sol, fundamentally altering the thermal properties of the heating element. This parameter change enables the heating element to withstand temperatures of 800°C or higher while maintaining structural integrity and adhesion, eliminating the smoke and burn issues associated with silicone rubber at high temperatures.
Solution Approach 2:
The patent creates a composite heating element material by combining ferrite particles with colloidal silica sol binder. This composite structure integrates the microwave-absorbing properties of ferrite with the high-temperature stability and adhesion properties of colloidal silica, achieving both ease of manufacture and high heat resistance (800°C or higher) simultaneously.
2Ease of manufacture
If conventional heating elements with low heat resistance are used, then the manufacturing cost is low, but the cooking time is long and safety concerns arise
Solution Approach 1:
The patent changes the thermal conductivity and heat resistance parameters of the heating element by using ferrite particles with specific size distributions (0.01-100 μm) combined with colloidal silica sol. This enables the heating element to rapidly convert microwave energy to thermal energy and maintain high temperatures, significantly reducing cooking time while preserving manufacturing simplicity through direct mixing and molding processes.
3Use of energy by stationary object
If microwave ovens use only microwaves for cooking, then the energy consumption is low and the cooking process is simple, but the food becomes hard and dry due to water evaporation and shelled food can explode
Solution Approach 1:
The patent introduces a ferrite-containing heating element as an intermediary substance that absorbs microwave energy and converts it to localized high-temperature heat. This mediator enables the microwave oven to achieve high-temperature cooking effects similar to conventional heating methods while maintaining the energy efficiency and simplicity of microwave operation, preventing food from becoming hard and dry and avoiding explosions of shelled food.
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 achieves efficient and safe high-temperature cooking with improved heat resistance and durability, reducing cooking time and energy consumption while maintaining food quality and safety.
Implementation Method 1
a heating element that generates heat by absorbing microwaves
Implementation Method 2
microwaves are used as clean energy because they do not generate carbon dioxide or harmful gas
Implementation Method 3
The basic inorganic binder that is used in the heating element of the present invention is a paste obtained using a silica sol, which has excellent adhesion
Data Source
AI summary
The present invention relates to a heating cooker using a ceramic heating element and a manufacturing method thereof, the method comprising: a cooker body preparation step; a heating element material preparation step of preparing any one or more selected from among mill scale, steelmaking slag and magnetite (Fe3O4); an inorganic binder preparation step of preparing, as an inorganic binder, a colloidal silica sol having a colloidal silica content of 8 to 30 wt %; a mixing step of mixing 20 to 40 parts by weight of the colloidal silica sol as the inorganic binder with 100 parts by weight of the heating element material, thereby making a heating material paste; an application step of applying the heating element paste to the bottom of the cooker body; and a drying and curing step of drying and curing the heating element paste, thereby forming a solid heating element.