Ceiling Ventilation Fan Layout for Quiet Illumination
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Solution Overview
Problem
Conventional ceiling mounted ventilation structures with illumination enhance noise transmission due to their circular truncated conical design, which acts as a megaphone for air blow and operation noises.
Innovation Solution
A ceiling mounted ventilation fan with illumination is designed, featuring a main housing with a second opening for light guidance into the room and an air inlet on the fan casing opening upward, opposite to the noise transmission path, along with movable fan units and guiding members for maintenance, to reduce noise propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a circular truncated conical recessed portion is used to reflect light into the room, then illumination function is enhanced, but noise transmission is worsened due to megaphone effect
Solution Approach 1:
The invention divides the housing into separate functional sections: a lighting cover with reflecting surface for illumination, and a fan casing with air inlet opening for ventilation. This segmentation allows the lighting portion to maintain the reflective truncated conical shape while the fan casing directs air intake away from the room, preventing noise transmission through the light opening.
Solution Approach 2:
Instead of having the air inlet opening face downward toward the room like conventional designs, the invention inverts the direction by opening the air inlet upward on the fan casing. This reversal prevents the megaphone effect from transmitting noise into the room while still allowing effective air intake for ventilation.
2Stability of the object's composition
If the fan unit is fixed in the main housing, then structural stability is improved, but maintenance accessibility is worsened
Solution Approach 1:
The fan unit is designed with movable leg parts that enable it to slide between a fixed operational position and a removable maintenance position. This dynamic design allows the fan unit to be stable during operation while easily accessible for maintenance by sliding it outward through the second opening.
3Productivity
If the air inlet opening faces downward toward the room, then air intake efficiency is improved, but noise transmission into the room is worsened
Solution Approach 1:
The air inlet opening on the fan casing is oriented upward instead of downward, reversing the conventional configuration. This inversion maintains effective air intake by drawing air from the ceiling cavity while preventing noise transmission into the room, as the opening faces away from the living 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 configuration effectively suppresses noise transmission into the room by directing light and air intake oppositely, reducing operation noise levels and enhancing maintenance accessibility.
Implementation Method 1
a lighting cover placed in the main housing so as to surround the illumination unit, the lighting cover having a reflecting surface which reflects light from the illumination unit so as to guide the light through the second opening into the room
Data Source
AI summary
The ceiling mounted ventilation fan with illumination employs a configuration in which a second opening for guiding light from an illumination unit into the room is formed in a lower part of a main housing and in which a air inlet on a fan casing of a fan unit is provided so as to open toward upper part of the main housing. Thus the air inlet of the fan unit opens in a direction opposite to the second opening communicating with inside of the room. As a result, sounds such as operation noises from the fan unit that are transmitted to outside of the fan unit chiefly through the air inlet can be made to resist being transmitted through the second opening into the room, so that the noises can be reduced.