Induction hob
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Solution Overview
Problem
Induction hobs face challenges in temperature management due to the design of a plastic collection tray lower casing, which complicates cooling and is exacerbated by installation in closed kitchen cabinets, leading to potential overheating of electronics.
Innovation Solution
The implementation of a guided cooling air flow system using ambient air directed through air ducts to heat sinks, ensuring that only unheated air is used for cooling, thereby improving temperature management without the need for complex thermal insulation or cooling systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic collection tray lower casing is used, then the induction hob meets safety requirements for molten plastic containment, but the cooling of electronics becomes complicated and difficult to implement
Solution Approach 1:
The lower casing is divided into two functional zones: an upper region for electronics housing and cooling, and a lower plastic collection tray region for safety containment. This segmentation allows the cooling system to operate independently in the upper region without interfering with the molten plastic containment function in the lower region, thus resolving the contradiction between safety requirements and cooling complexity.
Solution Approach 2:
A holding plate is introduced as an intermediary component between the heating coil and the lower casing. This holding plate creates a thermal barrier that prevents heat from the heating coil from directly affecting the electronics and cooling system in the lower casing, enabling effective cooling while maintaining the safety function of the plastic collection tray.
2Ease of operation
If the induction hob is installed in a closed kitchen cabinet, then it integrates well with kitchen furniture, but the electronics are prone to overheating due to restricted air flow
Solution Approach 1:
The cooling air flow path is pre-configured within the lower casing before the induction hob is installed in the kitchen cabinet. Inlet openings and air ducts are positioned to ensure that ambient air can be drawn in and directed to the electronics cooling area even when the hob is installed in a closed cabinet space, thus maintaining effective cooling while allowing integration with kitchen furniture.
Solution Approach 2:
The cooling system utilizes the vertical dimension within the lower casing by creating a three-dimensional cooling air flow path that moves air from the inlet openings through the electronics housing area and out through outlet openings. This spatial arrangement ensures adequate air circulation for cooling even when the hob is installed in a confined cabinet space, resolving the contradiction between integration and overheating prevention.
3Device complexity
If cooling air flow is not guided, then the structure is simpler, but the cooling effect is insufficient and hot air recirculates
Solution Approach 1:
Air ducts are strategically positioned and shaped to create localized high-velocity air flow paths that directly target the electronics housing and heat sink areas. This localized air flow guidance ensures that cooling air is delivered precisely where needed, maximizing cooling effectiveness without requiring a complex structure that guides air throughout the entire lower casing.
Solution Approach 2:
The cooling system relies on the mechanical action of fans to generate and direct the cooling air flow, replacing the need for complex passive air flow guidance structures. The fans create sufficient air pressure and velocity to push cooling air through the electronics housing area, eliminating the need for elaborate mechanical air guiding components while maintaining effective cooling.
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 solution provides a strong cooling effect, preventing electronics from exceeding safety temperature limits and is particularly effective for induction hobs with plastic collection trays, such as those designed for the North American market, by ensuring efficient air guidance and homogenization of temperatures within the induction hob.
Implementation Method 1
at least one fan by which a cooling air flow for cooling the electronics can be generated in the lower casing
Implementation Method 2
a guided cooling air flow of ambient air is provided for each fan and is carried out by a heat sink located behind the particular fan
Data Source
AI summary
An induction hob includes: a cover plate having at least one cooking area; a holding plate arranged parallel to the cover plate; at least one inductive heating coil arranged in an intermediate space between the cover plate and the holding plate; at least one electronics housing having electronics for the heating coil, which at least one electronics housing is arranged on a side of the holding plate facing away from the heating coil; a lower casing that delimits the induction hob at a bottom thereof; and at least one fan by which a cooling air flow for cooling the electronics is generatable in the lower casing. The at least one electronics housing is arranged in the lower casing, which is open at a top thereof, the holding plate covering the lower casing in an essentially airtight manner.