Core Temperature Detector and Combination Cooking Appliance Having a Core Temperature Detector
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Solution Overview
Problem
Core temperature detectors in microwave cooking appliances can act as antennas, receiving microwaves and causing unwanted electrical currents, leading to overheating and potential damage, especially when not inserted into a cooking product.
Innovation Solution
A core temperature detector design featuring a contacting tube with a cable guided through it, where the cable has an unsheathed area forming a contact point with the contacting tube, positioned to minimize electromagnetic field exposure, reducing energy input and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the core temperature detector is used in microwave operation, then temperature monitoring function is provided, but the measuring rod acts as an antenna receiving microwaves causing unwanted electrical currents and overheating
Solution Approach 1:
A dielectric coating is applied to the measuring rod, acting as an intermediary layer between the microwave radiation and the metallic measuring rod. This dielectric barrier prevents direct microwave coupling to the metal, eliminating unwanted electrical currents while allowing the temperature sensing function to operate reliably.
Solution Approach 2:
The patent acknowledges that the metallic measuring rod naturally interacts with microwave radiation, but converts this potentially harmful effect into a controlled phenomenon by using the known electromagnetic properties to design a dielectric coating thickness that specifically prevents resonance and current generation at microwave frequencies.
2Reliability
If the core temperature detector remains in the cooking chamber during microwave operation, then continuous monitoring is possible, but the handle section heats up due to energy absorption
Solution Approach 1:
The dielectric coating serves as a thermal and electromagnetic intermediary, reducing energy absorption in the handle section while allowing the measuring rod to remain in the cooking chamber for continuous temperature monitoring during microwave operation.
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 effectively reduces energy input and heat generation in the core temperature detector, extending its service life and ensuring accurate temperature sensing during microwave cooking.
Implementation Method 1
the use of the core temperature detector poses the problem that the measuring rod may act as an antenna which receives the microwaves that are fed in
Implementation Method 2
The contact point has a distance to the handle-side end, which corresponds to an electrical length of the microwave radiation in the handle section, which is shorter than or equal to one quarter of the wavelength of the microwave radiation used in the combination cooking appliance. This ensures that the handle-side end of the contacting tube is located in a minimum of the electromagnetic field
Implementation Method 3
A core temperature detector typically comprises a measuring rod equipped with temperature sensors, which is inserted into the cooking product before the cooking process begins. During the cooking process, the temperature sensors measure the core temperatures in the core of the cooking product
Data Source
AI summary
A core temperature detector for a combination cooking appliance, has a measuring section and a handle section. Furthermore, a contacting tube is provided, a cable being guided in the contacting tube. The cable has an unsheathed area in the handle section, in which the contacting tube forms a contact point along with the cable, wherein the contact point has a distance to the handle-side end, which corresponds to an electrical length of the microwave radiation in the handle section, which is shorter than or equal to one quarter of the wavelength of the microwave radiation used in the combination cooking appliance. Also described is a combination cooking appliance comprising the core temperature detector as above described.