Induction Cooker Infrared Sensor Shielding and Insulation
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Solution Overview
Problem
The existing induction-heating cookers face inefficiencies in assembly and reduced infrared sensor detection accuracy due to electromagnetic field interference, which affects the magnetic shield and electrical insulation around the sensor.
Innovation Solution
The design incorporates a spacer for electrical insulation between the magnetic shield plate and the casing, reducing electromagnetic wave intrusion and enhancing assembly efficiency by integrating the heating coil, ferrite, and magnetic shield as a single unit, with a thin spacer ensuring minimal electromagnetic field impact on the infrared sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the magnetic shield plate is directly attached to the heating coil assembly, then assembly efficiency is improved, but electromagnetic field interference with the infrared sensor increases
Solution Approach 1:
An insulating plate is introduced as an intermediary component between the magnetic shield plate and the heating coil assembly. This insulating plate serves dual functions: it maintains the magnetic shielding effect while simultaneously providing electrical insulation to prevent electromagnetic field interference with the infrared sensor, thus resolving the contradiction between assembly efficiency and electromagnetic interference protection.
Solution Approach 2:
The assembly is segmented into distinct functional layers: the heating coil assembly, the magnetic shield plate, and the insulating plate. This segmentation allows each component to perform its specific function independently - the magnetic shield plate provides electromagnetic shielding while the insulating plate provides electrical isolation, enabling both assembly efficiency and interference protection.
2Measurement precision
If electrical insulation is enhanced between the magnetic shield plate and casing, then sensor detection accuracy is improved, but assembly complexity increases
Solution Approach 1:
The insulating plate is merged with the existing structural assembly, serving both as an electrical insulator and as part of the overall magnetic shield assembly. This integration ensures that enhancing electrical insulation does not significantly increase assembly complexity, as the insulating plate is incorporated into the existing layered structure rather than adding a separate complex insulation system.
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 improves assembly efficiency and maintains accurate infrared sensor detection by securing electrical insulation and magnetic shielding, reducing the impact of electromagnetic fields on the sensor.
Implementation Method 1
a heating coil to induction-heat a cooking container
Implementation Method 2
a heating coil to induction-heat a cooking container
Implementation Method 3
plural rod-shaped ferromagnetic materials (ferrite) to collect magnetic flux
Implementation Method 4
a magnetic shield plate that is made of metal such as aluminum... by the magnetic shield plate shielding the magnetic field
Implementation Method 5
an infrared sensor to detect the temperature of the cooking container
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
An induction-heating cooker 20 has a top plate 23 on which a cooking container 22 is placed, a heating coil 24 disposed below the top plate 23, an insulation plate 25 on which the heating coil 24 is placed, a ferrite 26 on which the insulation plate 25 is placed, a metallic magnetic shield plate 27 on which the ferrite 26 is placed, an infrared sensor 29 arranged below the magnetic shield plate 27 to detect an infrared ray radiated from the cooking container 22, a casing 30 having at least a bottom part 30b located below the infrared sensor 29 and a side wall part 30a extended upward from the bottom part 30b so as to surround the infrared sensor 29 and made from an electrically conductive material, and a spacer 31 intervening between the lower surface of the magnetic shield plate 27 and the upper end of the casing 30 in contact with both these surfaces and made from a material having electrical insulation.