Recirculating Downdraft Venting for Ductless Cooking Appliances
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Solution Overview
Problem
Existing cooking appliances with open top vessels emit unpleasant vapors and grease, leading to odor permeation and surface contamination, and require external ductwork for ventilation systems, which can be cumbersome and impractical, especially in apartments.
Innovation Solution
A recirculating downdraft system integrated within the cooking appliance that includes an inlet, outlet, and air duct system, utilizing a blower to draw air from the ambient environment, clean it, and expel it back into the kitchen, eliminating the need for external ductwork.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ventilation systems with external ductwork are used to remove vapors and grease, then air cleaning effectiveness is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent combines the ventilation system components (blower, filters, ductwork) directly into the cooking appliance body, merging previously separate external ventilation components with the appliance itself. This integration eliminates the need for separate external ductwork installations while maintaining effective vapor and grease removal capabilities through the integrated air handling system.
Solution Approach 2:
The cooking appliance provides its own ventilation service through integrated blowers that draw air through the cooking surface, capture vapors and grease, filter them through integrated filtration systems, and recirculate cleaned air back into the kitchen. This self-service approach eliminates dependency on external ventilation infrastructure.
2Object-generated harmful factors
If external ductwork is installed for ventilation, then air expulsion capability is improved, but ease of operation and installation are worsened
Solution Approach 1:
The ventilation system is merged into the appliance structure with the blower, ductwork, and filtration components integrated within the appliance body. This allows effective vapor expulsion while eliminating the need for complex external ductwork installation through walls or to external vents.
Solution Approach 2:
The appliance performs its own ventilation function using integrated components that draw air through the cooking surface, process vapors and grease through filtration, and recirculate cleaned air. This self-contained system provides installation convenience while maintaining effective air handling capability.
3Ease of operation
If recirculating ventilation system is used without external ductwork, then ease of installation is improved, but air cleaning effectiveness may be worsened
Solution Approach 1:
The system merges multiple air handling functions (air intake, vapor capture, grease filtration, odor removal, and air recirculation) into an integrated appliance-based system. This integration maintains effective air quality management while providing installation simplicity by eliminating external ductwork requirements.
Solution Approach 2:
The appliance provides self-contained air cleaning and recirculation through integrated blowers and filtration systems that process air vapors and grease locally and recirculate cleaned air back into the kitchen, maintaining air quality effectiveness without external ventilation infrastructure.
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
Effectively cleans and recirculates air, removing odors and grease, maintaining a cleaner kitchen environment without the need for extensive ductwork installations, enhancing convenience and practicality.
Implementation Method 1
A recirculating downdraft system integrated within the cooking appliance that includes an inlet, outlet, and air duct system, utilizing a blower to draw air from the ambient environment, clean it, and expel it back into the kitchen
Data Source
AI summary
Provided is a cooking appliance that includes an oven cavity and an oven door pivotally mounted to a front surface and configured to selectively provide access to an interior of the oven cavity. A cooktop includes a heating element and an inlet of a downdraft system exposed at a top surface of the cooking appliance. An outlet is provided through which air drawn into the downdraft system through the inlet is exhausted to an ambient environment of a room in which the cooking appliance is located. An air duct system conveys air between the inlet and the outlet, and a blower draws air from the ambient environment of the cooking appliance adjacent to the cooktop into the inlet and through the air duct system to be expelled through the outlet back into the ambient environment.