Ceiling mounted ventilation fan with illumination
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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 within the room.
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 is used to direct light into the room, and a restriction member and gap for air intake are implemented to restrict air passage and discharge air through the fan unit, reducing noise conduction by enhancing the directivity of noise propagation.
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 invention divides the ventilation structure into separate functional components: a main body portion and a protruding portion extending toward the room. This segmentation allows the main body to house the fan while the protruding portion directs airflow away from the room, separating the ventilation function from the noise conduction path while preserving the illuminating function through strategic placement of light sources.
2Ease of manufacture
If the recess portion acts as a megaphone shape, then air flow sounds are conducted farther into the room, but the structural simplicity is maintained
Solution Approach 1:
The invention extracts the noise-amplifying megaphone shape from the overall structure by replacing it with a main body portion and a separately directed protruding portion. This extraction removes the harmful acoustic resonance while preserving the essential ventilation and illumination functions, achieving noise reduction without significantly complicating the manufacturing process.
3Productivity
If air is discharged directly through the ceiling opening, then ventilation efficiency is high, but noise is conducted directly into the room
Solution Approach 1:
The invention changes the dimensional direction of airflow discharge by extending a protruding portion from the main body toward the room. Instead of discharging air directly upward through the ceiling opening, the airflow is redirected along the extended dimension of the protruding portion, maintaining ventilation efficiency while positioning the discharge point away from the room interior to reduce noise conduction.
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, resulting in a ventilation fan that reduces noise propagation while maintaining lighting functionality.
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 communicating with 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.