Ceiling Ventilation Fan Lighting Cover for Noise Suppression
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Solution Overview
Problem
Conventional ceiling mounted ventilation structures with illumination suffer from increased noise conduction due to the circular truncated conical cylinder shape, which acts as a megaphone, amplifying air flow and operating sounds.
Innovation Solution
A ceiling mounted ventilation fan with illumination featuring a main housing, fan unit, and lighting equipment, where a lighting cover with a reflecting surface and a restriction member is used to restrict air passage, and a gap for air intake is formed between the lighting cover and the main housing, allowing air to be discharged through the fan unit, thereby reducing noise conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a circular truncated conical cylinder shape is used for the recess portion, then the downlight function is enhanced through light reflection, but noise conduction is increased due to the megaphone effect
Solution Approach 1:
The recess portion is divided into multiple segments: a cylindrical portion and a conical portion. This segmentation allows the cylindrical portion to serve as the primary light reflection surface while the conical portion has reduced surface area, thereby maintaining illumination function while reducing the megaphone effect that amplifies noise
Solution Approach 2:
Different portions of the recess structure are given different geometric properties: the cylindrical portion provides optimal light reflection for downlight function, while the conical portion with gradually decreasing diameter reduces noise conduction. This local differentiation of geometric quality resolves the contradiction between illumination enhancement and noise suppression
2Illumination intensity
If the recess portion acts as a megaphone shape, then noise is conducted farther and with increased directivity, but this same shape enhances light reflection for illumination
Solution Approach 1:
The recess is segmented into a cylindrical portion (for light reflection) and a conical portion (with reduced noise conduction). This segmentation breaks the continuous megaphone shape that would otherwise amplify both light and noise, allowing selective optimization of each function
Solution Approach 2:
The recess structure employs asymmetric geometry with a cylindrical portion followed by a conical portion with smaller diameter. This asymmetric design creates different acoustic and optical pathways: light reflects efficiently off the cylindrical surface while noise conduction is reduced in the tapered section, resolving the contradiction between illumination and noise control
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 solution effectively suppresses noise conduction into the room by restricting air passage and using a gap for air intake, reducing the megaphone effect and enhancing noise directivity.
Implementation Method 1
the lighting cover having a reflecting surface for reflecting light from the lighting part to lead the light into the room through the second opening
Data Source
AI summary
A ventilation fan with illumination includes a housing, a fan, and lighting equipment in the housing. The housing includes a first opening connected to an air outlet, the first opening communicating with a duct, and a second opening that communicates with an interior space, The lighting equipment includes a light, a cover in the housing that surrounds the light periphery, the cover reflecting light and transmitting the light into the space through the second opening, and a restrictor that restricts passage of air between the light periphery and the lighting cover. An air intake gap is provided between a lower end of the cover and an edge of the second opening and introduced through the second opening and the air intake gap, is discharged through the first opening into the duct, the edge of the second opening being located below the lower end of the cover.