Cooker hood
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Solution Overview
Problem
Cooker hoods in high-rise buildings generate loud noise when increasing static pressure to ensure adequate air volume, affecting user comfort.
Innovation Solution
A cooker hood design featuring a housing with a fan and air guide pipe, both equipped with acoustic attenuation micro holes, where the air guide pipe's pipe wall and additional components like flow guide plates and thin plates with micro holes reduce noise by allowing noise to leak out and be reflected multiple times, thereby minimizing noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the static pressure is increased to provide adequate air volume, then the air volume is sufficient, but the noise level increases
Solution Approach 1:
The patent applies porous materials by forming micro holes (0.1-1mm diameter) in the air guide pipe wall, allowing noise to escape through these porous structures while maintaining the pipe's structural integrity and airflow function. This converts the solid pipe wall into a porous structure that attenuates noise through multiple reflection and scattering mechanisms.
Solution Approach 2:
The air guide pipe with micro holes acts as an intermediary structure between the high-noise fan chamber and the external environment. It mediates the noise transmission by allowing sound waves to leak out gradually through the micro holes rather than propagating directly, thereby reducing the overall noise level while maintaining airflow.
2Object-generated harmful factors
If acoustic attenuation structures are added to reduce noise, then the noise is reduced, but the device complexity increases
Solution Approach 1:
The air guide pipe is designed to serve multiple functions: it guides airflow from the fan to the exhaust, provides structural support, and simultaneously acts as a noise attenuation device through the integrated micro holes. This multi-functionality eliminates the need for separate acoustic treatment components, reducing overall device complexity.
Solution Approach 2:
The noise attenuation function is merged directly into the air guide pipe structure by forming micro holes in its wall. Instead of adding separate acoustic treatment components, the pipe itself becomes the acoustic treatment element, combining airflow guidance and noise reduction into a single integrated component.
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 reduces noise by allowing noise to escape and be reflected multiple times, resulting in a quieter operation of the cooker hood.
Implementation Method 1
A pipe wall of the air guide pipe is provided with acoustic attenuation micro holes. The air guide pipe is provided with a plurality of flow guide plates, and surfaces of the flow guide plates are provided with acoustic attenuation micro holes. When a cooker hood runs, noise generated by smoke passing through the air guide pipe leaks out of the acoustic attenuation micro holes on the air guide pipe, and is reflected for a plurality of times in a space between the air guide pipe and a housing, so the noise is reduced.
Data Source
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AI summary
A cooker hood 1 is provided, including: a housing (30); a fan (11) mounted in the housing (30), where the fan (11) includes an air intake vent (11a) and an air exhaust vent (11b); and further including: an air guide pipe (12) mounted in the housing (30), where the air guide pipe (12) includes an air intake vent (12a) and an air exhaust vent (12b), and the air exhaust vent (12b) of the air guide pipe is connected to the air intake vent (11a) of the fan; and a pipe wall of the air guide pipe (12) is provided with acoustic attenuation micro holes. Noise generated when the cooker hood 1 runs leaks out of the acoustic attenuation micro holes on the air guide pipe (12) when passing through the air guide pipe (12), and the noise is reflected in space between the pipe wall of the air guide pipe (12) and the housing (30) back and forth for a plurality of times and is reduced after being reflected for the plurality of times, thereby achieving an effect of reducing the noise of the cooker hood.