Ventilation Hood Panel Design for Negative-Pressure Smoke Collection
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Solution Overview
Problem
Conventional ventilation hoods in kitchens with a microwave oven above a heating cooker face challenges in maximizing air suction volume due to narrow airflow paths, leading to inefficient smoke collection and increased power consumption and noise, while existing solutions like panels can disrupt cooking and allow smoke to escape into the room.
Innovation Solution
A ventilation hood design with a housing, blowing fan, and a panel that generates negative pressure in front of the airflow path, optimizing the distance between the panel and housing to enhance smoke collection efficiency, and incorporating a grill at the upstream opening to prevent user interference and odor circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fan speed is increased to increase suction air volume, then suction air volume may be increased, but power consumption and noise increase
Solution Approach 1:
The airflow path is segmented into multiple regions: a first airflow path between the panel and lower surface of the housing, and a second airflow path above the panel. This segmentation allows smoke to be collected from different zones simultaneously, improving overall suction efficiency without requiring higher fan speeds.
Solution Approach 2:
The invention introduces a vertical dimension to smoke collection by creating airflow paths both below and above the panel. The panel is positioned to allow smoke to rise and be collected from above while maintaining a sealed airflow path below, effectively utilizing three-dimensional space for smoke extraction.
2Productivity
If panel is provided to form airflow path between lower surface of housing and panel, then collection efficiency is improved, but smoke from outside of panel is not collected and diffuses into room
Solution Approach 1:
The airflow path is divided into two segments: a first sealed airflow path between the panel and housing lower surface, and a second airflow path above the panel. This segmentation ensures that smoke generated outside the panel is drawn into the second airflow path and directed to the suction port, preventing it from diffusing into the room while maintaining the effectiveness of the first airflow path.
Solution Approach 2:
The panel acts as an intermediary element that creates both a sealed boundary for the first airflow path and an opening for the second airflow path. Its specific positioning and structure allow it to mediate between the need for a sealed airflow path below and the need to collect smoke rising from the cooking surface above.
3Productivity
If panel is positioned close to housing to generate negative pressure, then smoke collection is improved, but cooking space is reduced
Solution Approach 1:
The panel is positioned to create a localized negative pressure zone specifically at the airflow path between the panel and housing lower surface, rather than uniformly reducing space throughout the housing. This localized approach maintains effective smoke collection while preserving overall cooking space in other areas of the housing.
Solution Approach 2:
The invention utilizes the vertical dimension by positioning the panel to create airflow paths both below and above it. This three-dimensional airflow configuration allows effective smoke collection without requiring the panel to be positioned so close to the housing that it compromises horizontal cooking space.
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 design effectively increases smoke collection efficiency, reduces noise, and maintains cooking operability by ensuring smoke is drawn into the airflow path, even when the microwave oven is positioned above the heating cooker, while minimizing power consumption and maintaining indoor air quality.
Implementation Method 1
the panel is arranged such that a negative pressure is generated in a front of an upstream opening of the airflow path by the operation of the blowing fan
Data Source
AI summary
A ventilation hood is provided. The ventilation hood includes a housing provided above a heating cooker and having an air suction port on a lower surface thereof, a blowing fan provided in the housing to induce air to the air suction port, and a panel provided below the housing to form an airflow path between the lower surface of the housing and the panel, wherein the panel faces the air suction port with a gap therebetween to cover the air suction port so that air is sucked into the airflow path from a front of an upstream opening of the airflow path as the blowing fan operates.