Kitchen Extractor Hood Vortex Flow for Compact Fume Capture
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Solution Overview
Problem
Conventional kitchen extractor hoods are cumbersome and noisy due to the large volume required for effective fume extraction, especially when dealing with high-power burners, and often inefficient in capturing rising fumes without generating a vortex airflow.
Innovation Solution
The extractor hood incorporates a delivery fan and a distributor with annular deflector fins inclined at an angle, creating a vortex airflow that intercepts and conveys fumes from the cooktop, allowing for more efficient extraction while minimizing fan size and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the box body is made very large and the electrical motor is made very powerful to ensure effective fume extraction, then the fume extraction efficiency is improved, but the volume of the hood body and the noise of the fan motor increase
Solution Approach 1:
The patent applies pneumatic principles by using a delivery fan to generate a controlled airflow that creates a vortex flow pattern. This vortex acts as a pneumatic screen or barrier, guiding fumes into the extraction conduit without requiring a large box body volume. The airflow dynamics enable effective fume capture through fluid motion rather than sheer size.
Solution Approach 2:
The patent changes the flow parameters by transforming the airflow from a simple linear flow to a vortex flow pattern. The deflector fins are specifically designed to create rotational motion in the air stream, changing the velocity distribution and flow structure. This parameter change enables more efficient fume interception with a smaller, quieter system.
2Productivity
If the box body is made very large and the electrical motor is made very powerful to ensure effective fume extraction, then the fume extraction efficiency is improved, but the noise of the fan motor increases
Solution Approach 1:
The delivery fan generates a controlled airflow that creates a vortex flow pattern, utilizing pneumatic principles to guide fumes into the extraction conduit. This approach achieves effective fume extraction without requiring a powerful, noisy motor, as the vortex dynamics enhance capture efficiency.
Solution Approach 2:
By transforming the airflow into a vortex pattern through deflector fins, the system changes flow parameters to improve extraction efficiency. This allows the use of a smaller, quieter motor while maintaining effective fume capture performance.
3Device complexity
If no distributor intended to generate a vortex is provided in the delivery conduit, then the device complexity is reduced, but the ability to intercept and convey fumes towards the extraction conduit is insufficient
Solution Approach 1:
The distributor with deflector fins creates a vortex flow pattern that acts as a pneumatic guide, directing fumes toward the extraction conduit. This relatively simple structure leverages fluid dynamics to achieve effective fume interception without complex mechanical components.
Solution Approach 2:
The deflector fins transform the airflow from a simple stream to a vortex flow, changing the flow parameters to improve fume capture. This parameter change enables effective fume conveyance with a simple distributor structure rather than requiring complex mechanisms.
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 enhances fume extraction efficiency, reduces the size and noise of the fans, and effectively captures fumes from high-power burners without the need for a large hood body, resulting in a more compact and quiet operation.
Implementation Method 1
a distributor suitable for generating a vortex-shaped airflow, which rotates around an axis of the distributor
Data Source
AI summary
An extractor hood has a box body, an extractor fan with at least one inlet in communication with an internal chamber of the box body, a delivery fan with an inlet in communication with the internal chamber of the box body and a delivery outlet in communication with a delivery conduit, a distributor disposed at the end of the delivery conduit. The distributor has an annular body and a plurality of deflector fins that protrude from the internal surface of the annular body in such a way to generate at least one vortex-shaped flow that rotates around the axis of the distributor under the distributor and in front of the opening of the base portion of the box body through which fumes are extracted.