Integrated Hob Ventilation With Downward Duct Filtration
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Solution Overview
Problem
Existing fume extraction devices have reduced suction performance due to the fan being spaced apart from the hob and rely solely on filter elements in the suction pipe above the hob, which does not effectively clean air and can direct cleaned air negatively towards the user.
Innovation Solution
Integrating the fan into the hob with a downwardly extending air duct and a circulating air filter, allowing for reliable air cleaning and effective suction performance while directing cleaned air away from the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fan is arranged spaced apart from the hob, then the device structure is simplified, but the suction performance is reduced
Solution Approach 1:
The fan is integrated directly into the hob structure, merging the fume extraction device with the hob. This eliminates the need for a separate housing spaced apart from the hob, simplifying the overall device structure while maintaining optimal suction performance by positioning the fan in immediate proximity to the cooking surface.
2Device complexity
If only filter elements in the suction pipe are used, then the device complexity is reduced, but the air cleaning reliability is insufficient
Solution Approach 1:
The air cleaning function is divided into two distinct stages: primary filtration through filter elements in the suction pipe near the hob, and secondary filtration through a circulating air filter in the discharge air duct. This segmentation allows each filter to perform its specific function optimally, ensuring reliable air cleaning while maintaining reasonable device complexity.
Solution Approach 2:
The circulating air filter is positioned in the discharge air duct to perform preliminary cleaning of the air before it is discharged into the kitchen environment. This preliminary action ensures that odors and contaminants are removed before the air reaches the user, enhancing air cleaning reliability.
3Productivity
If the fan is integrated into the hob, then the suction performance is improved, but the device complexity increases
Solution Approach 1:
The fan is integrated directly into the hob structure, merging the fume extraction device with the hob. This eliminates the need for a separate housing spaced apart from the hob, simplifying the overall device structure while maintaining optimal suction performance by positioning the fan in immediate proximity to the cooking surface.
4Device complexity
If air is discharged directly from the fume extraction device, then the device complexity is reduced, but harmful factors increase due to negative airflow effect on user
Solution Approach 1:
The circulating air filter is positioned in the discharge air duct to perform preliminary cleaning of the air before it is discharged into the kitchen environment. This preliminary action ensures that odors and contaminants are removed before the air reaches the user, enhancing air cleaning reliability.
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 ensures reliable air cleaning and effective suction performance while preventing direct airflow towards the user, effectively removing odors before discharge.
Implementation Method 1
an at least partially downwardly extending air duct being provided, said air duct being located in the direction of flow downstream of the fan and a circulating air filter being arranged in said air duct
Data Source
AI summary
A combined appliance includes a hob and a fume extraction device which is integrated in the hob and includes a fume extraction housing and an air duct having an end which is connected to the fume extraction housing. The fume extraction housing has an accommodating space having at least one region adjacent to the hob for accommodating a fan. The air duct has a vertical region which runs downward. A circulating air filter is arranged in the air duct.