Electric cooking or grilling device
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Solution Overview
Problem
Existing electric baking or grilling devices have limited heating output due to safety concerns, resulting in longer preparation times and potential overheating issues, which violate EU maximum surface temperature regulations.
Innovation Solution
A double-walled hood-like housing design with a vacuum cavity between the walls acts as a heat barrier, allowing increased heating output without raising the outer surface temperature, and additional heat protection coatings enhance this effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heating output is increased to reduce preparation time, then productivity improves, but the outer surface temperature exceeds EU regulations and user safety is compromised
Solution Approach 1:
The housing is divided into inner and outer walls with a vacuum cavity between them, segmenting the thermal path to isolate the heat source from the outer surface
Solution Approach 2:
A vacuum cavity acts as an intermediary layer between the heated inner wall and the outer wall, blocking heat transfer while allowing the structure to maintain mechanical integrity
2Quantity of substance
If the heating output is increased to cook more food in the same time, then quantity of food prepared improves, but the housing material may be damaged due to excessive heat
Solution Approach 1:
The housing structure is segmented into multiple walls with a vacuum gap, creating thermal zones that protect the outer housing material from excessive heat
Solution Approach 2:
The housing combines metal inner wall, vacuum insulation layer, and outer wall material to create a composite structure with superior thermal resistance
3Loss of energy
If solid metal housing parts are used to reduce heat transfer, then heat loss to outside decreases, but the heating output must be limited to prevent outer surface overheating
Solution Approach 1:
The vacuum cavity serves as an intermediary that blocks heat transfer without requiring reduction of heating power, as vacuum is the ultimate thermal insulator
Solution Approach 2:
The vacuum creates an inert environment free of gas molecules that could conduct or convect heat, providing maximum thermal insulation
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 design significantly reduces food preparation time, increases the quantity of food that can be cooked in the same time, and meets EU surface temperature regulations while ensuring user safety.
Implementation Method 1
a vacuum is formed in the cavity between the spaced walls
Implementation Method 2
The double-walled design of the walls of the respective hood-like housing part forms a heat barrier which effectively prevents the formation of high surface temperatures on the outer skin
Data Source
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AI summary
To create an electric baking or grilling appliance, such as a contact grill or a waffle iron (1), comprising at least a housing (2) and an electric heating element (3) arranged in the housing (2) with a contact surface (4) or two electrically heated contact surfaces (4) pivotable into a parallel, mutually approximate position, wherein a hood-like housing part (2a, 2b) covers or surrounds the respective rear side of the heated contact surface (4) and the heating element (3) arranged thereon, wherein each hood-like housing part (2a, 2b) is made of metal, in which, with increased heating power and thus a particularly short preparation time of the food to be baked or grilled, only a low surface temperature occurs on the outer surface of the housing, which can optionally be designed visually according to the user's wishes and has a long service life, it is proposed that the respective hood-like housing part (2a, 2b) be double-walled.wherein the two walls (9, 10) are spaced apart from each other and a cavity (6) is formed between the spaced walls (9, 10).