Cooking vessel suitable for induction comprising an improved bottom plate
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Solution Overview
Problem
Existing cooking vessels for induction heating devices suffer from suboptimal heating performance due to non-ferromagnetic areas not participating in heating, and require complex finishing operations, making them inefficient and costly to manufacture.
Innovation Solution
A cooking vessel design featuring a ferromagnetic plate with a continuously solid, crown-shaped peripheral bearing zone extending radially over the entire bottom, connected to the side wall by a curved part, ensuring uniform heating and compatibility with induction heating devices, while avoiding scratches on glass plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bottom has a crown-shaped extension not covered by the ferromagnetic plate, then the plate can be properly positioned and secured, but the extension does not actively participate in heating and requires additional finishing operations
Solution Approach 1:
The invention merges the heating function and positioning function into a single integrated structure. The ferromagnetic plate is designed with a peripheral bearing zone that extends radially to form a crown-shaped rim, eliminating the need for separate positioning extensions. This integrated design allows the plate to be properly positioned while the entire surface including the rim participates in heating, removing the need for additional finishing operations on non-heating extensions.
2Ease of manufacture
If the peripheral bearing zone is narrow, then the plate can be easier to manufacture, but it scratches the glass plate during manipulation
Solution Approach 1:
The invention applies local quality by creating a peripheral bearing zone with specifically optimized dimensions and material properties. The bearing zone extends radially with a controlled width L (where L/R1 > 0.08) and includes a raised peripheral rim, providing enhanced local contact area and protection for the glass plate at the critical edge region, while the rest of the plate maintains standard manufacturing characteristics.
3Productivity
If the plate extends over the entire flat face of the bottom, then heating performance is improved, but the peripheral bearing zone may deform during heating and cooling cycles
Solution Approach 1:
The invention applies preliminary action by pre-forming a raised peripheral rim around the peripheral bearing zone before the heating and cooling cycles begin. This rim structure is created during manufacturing to preemptively counteract the thermal expansion and contraction forces that occur during heating and cooling, providing mechanical constraint that prevents deformation of the bearing zone while allowing the plate to extend over the entire flat face for optimal heating performance.
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 design enhances heating performance by distributing induction heating power evenly across the bottom, maintaining the peripheral bearing zone's position through a raised rim, and preventing deformation, resulting in improved cooking efficiency and cost-effective production.
Implementation Method 1
The bottom receives a plate made of a ferromagnetic metal or alloy... intended to be placed horizontally on a heating device, in particular an induction heating device
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a cooking container (1) made from a sheet (3) of metal or light alloy, comprising a side wall (9) and a base (4) intended to be placed horizontally on a heating appliance, in particular an induction heating appliance, said base (4) receiving a plate (2) made of a ferromagnetic metal or alloy having different mechanical, thermal, physical properties and in particular a higher elastic limit than that of the metal or alloy of said sheet (3), said plate (2) comprising a continuously solid peripheral bearing area (11), in the shape of a crown which extends radially over a width L and which terminates in a raised peripheral rim (20) which extends towards the sheet (3).According to the invention, the bottom (4) is connected to the side wall (9) by a curved part (30) which extends upwards directly from the peripheral rim (20) and in that the plate (2) has a radius R1, the ratio L/R1 being greater than 0.08, preferably greater than 0.1.