Ceiling mounted ventilation fan
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Solution Overview
Problem
Conventional ceiling-mounted ventilation fans face difficulties in maintenance due to the fan's placement within the main housing, which complicates detachment and reattachment operations, especially when combined with other devices like lighting equipment, limiting available space for maintenance.
Innovation Solution
The design includes a fan unit with a fan casing that has engagement parts for secure positioning within the main housing, allowing for visual confirmation of engagement through a second opening, and a guiding member to facilitate accurate alignment and attachment, enhancing the working properties during maintenance operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fan is placed in the main housing, then the ventilation function is integrated, but the maintenance operation becomes difficult
Solution Approach 1:
The fan unit is separated from the main housing as a detachable module. The fan casing includes engagement parts that can be releasably connected to the main housing, allowing the fan unit to be segmented and removed for maintenance while maintaining integrated ventilation function during operation.
Solution Approach 2:
The engagement parts are designed to be releasable, transforming the static fixed connection into a dynamic removable connection. This allows the fan unit to transition between installed and maintained states, improving ease of repair while maintaining integration during operation.
2Stability of the object's composition
If the fan is fixed in the main housing, then the structural stability is improved, but the detachment operation becomes difficult
Solution Approach 1:
The connection between fan housing and main housing is segmented into discrete engagement parts (engagement claws and engagement grooves) that can be independently engaged and disengaged, allowing detachment while maintaining structural stability during operation.
Solution Approach 2:
The engagement parts serve as intermediary elements between the fan housing and main housing. These intermediaries provide stable connection during operation but can be easily released for detachment, resolving the contradiction between stability and ease of detachment.
3Manufacturing precision
If engagement parts are used for secure positioning, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The engagement claws and engagement grooves are designed with asymmetric shapes that provide precise positioning in the engaged state. The asymmetric geometry ensures correct orientation and position of the fan unit relative to the main housing, achieving high positioning accuracy through simple geometric forms rather than complex mechanisms.
Data Source
AI summary
A ceiling mounted ventilation fan comprises a main housing including a first opening communicating with a duct and a second opening communicating with inside of a room, and a fan unit including a fan casing having an air inlet opened in the main housing, and the fan casing includes a first engagement part releasably engaged with the first opening of the main housing, and a second engagement part releasably engaged with an inner wall of the main housing, positioning of the fan casing in an installation position is achieved in a state that the first engagement part is engaged with the first opening and the second engagement part is engaged with the inner wall of the main housing, and a state of the engagement can visually be confirmed through the second opening in a state that the positioning is achieved.