Cooking vessel and manufacturing method
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Solution Overview
Problem
Existing induction cooking vessels made with ferritic stainless steel suffer from temperature measurement inaccuracy due to hysteresis, with temperature variations of up to 70°C during heating and cooling, making it difficult to determine the correct temperature based on resonant frequency.
Innovation Solution
A cooking vessel with a bottom section made of unalloyed or low-alloyed steel, attached to a receptacle using a thin coating layer such as chromium, nickel, or copper, allowing for accurate temperature determination through frequency measurement with an error of less than 5°C during both heating and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferritic stainless steel is used in the bottom section, then induction heating capability is provided, but temperature measurement accuracy deteriorates due to hysteresis
Solution Approach 1:
The patent applies composite materials by combining unalloyed or low-alloyed steel with a coating layer (such as chromium, nickel, or copper) to create a bottom section that provides both induction heating capability and accurate temperature measurement. The unalloyed or low-alloyed steel base material eliminates hysteresis effects while the coating layer maintains induction heating properties, resolving the contradiction between heating capability and measurement accuracy.
2Measurement precision
If unalloyed or low-alloyed steel is used in the bottom section, then temperature measurement accuracy is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent uses a composite structure where unalloyed or low-alloyed steel provides accurate temperature measurement by eliminating hysteresis, while a protective coating layer (chromium, nickel, or copper) is applied to the surface to provide corrosion resistance. This composite approach allows the base material to optimize measurement accuracy while the coating protects against environmental degradation.
Solution Approach 2:
The coating layer acts as an intermediary between the unalloyed or low-alloyed steel base material and the external environment. It protects the base material from corrosion while allowing the magnetic properties of the base material to be utilized for accurate temperature measurement through resonant frequency detection.
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 use of unalloyed or low-alloyed steel in the bottom section enables precise temperature measurement in induction cooking vessels, eliminating hysteresis and providing reliable temperature determination during both heating and cooling processes.
Implementation Method 1
Induction heaters heat cooking vessels by magnetic induction which is obtained with an alternating electric current fed through a coil. The resulting field induces eddy currents in the cooking vessel, in particular in the bottom of the cooking vessel
Implementation Method 2
This measuring instrument produces an induction measuring resonant circuitry which interacts with the cooking vessel. The measuring resonant circuitry has a resonant frequency which is dependent on the permeability or inductivity of the cooking vessel
Implementation Method 3
The resulting field induces eddy currents in the cooking vessel, in particular in the bottom of the cooking vessel, which contribute in heating the cooking vessel
Implementation Method 4
The resulting field induces eddy currents in the cooking vessel, in particular in the bottom of the cooking vessel, which contribute in heating the cooking vessel
Data Source
AI summary
A cooking vessel includes a receptacle of a first material for receiving foodstuff, and a bottom section of a second material. The bottom section being attached to the receptacle for providing an induction heating capability for the cooking vessel. In order to provide a cooking vessel whose temperature can simply and reliably be determined during induction heating the second material is unalloyed or low-alloyed steel.