Ventilating fan
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Solution Overview
Problem
Conventional ventilating fans require multiple steps and increased man-hours for mounting, and suffer from poor air tightness due to the use of screws between the adapter and the casing.
Innovation Solution
The ventilating fan design features an adapter with outwardly extended flangings and folded sheets that form open grooves and slots, allowing for secure locking without screws, enhancing air tightness through inclined side surfaces and snap connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws are used to mount the adapter to the frame, then the adapter can be securely fixed, but the number of mounting steps increases and man-hours are increased
Solution Approach 1:
The invention extracts and eliminates the screw from the mounting system. The adapter is designed with a pressing portion that directly presses against the frame, removing the need for screws entirely. This extraction of the fastening element simplifies the mounting process while maintaining secure fixation through the pressing mechanism and engagement opening.
Solution Approach 2:
The adapter structure incorporates self-aligning features including the engagement opening and pressing portion that automatically position and secure the adapter to the frame without requiring additional fastening operations. The design enables the adapter to self-fixate through its own structural elements rather than requiring external screws.
2Strength
If screws are used to mount the adapter to the frame, then the adapter can be securely fixed, but the air tightness between the air outlet of the casing and the adapter deteriorates
Solution Approach 1:
By removing the screw entirely, the invention eliminates the interference of the screw head between the casing and adapter. The pressing portion makes direct contact with the frame, allowing the casing to sit flush against the adapter without any obstruction, thereby ensuring optimal air tightness.
Solution Approach 2:
Instead of using a screw to pull or push components together from the outside, the invention inverts the approach by having the adapter's pressing portion press directly against the frame from within, creating a screw-free connection that preserves the integrity of the air path.
Data Source
AI summary
The present invention provides a ventilating fan. In the ventilating fan, first and second flangings are extended outwards from vertical side edges and horizontal side edges of the air inlet of the adapter respectively, outer edges of the first flangings are firstly bent to form both side surface, and then edges of the both side surfaces are bent to form edge surfaces, and the first flangings, the side surfaces, and the edge surfaces confine open grooves; protrusions are disposed on an outer periphery of the air inlet, and a slot is formed between the protrusion and the first or the second flanging; and first folded sheets are extended outwards from both vertical side edges of the air outlet of the casing; and an edge of the air outlet of the frame abuts against and is clamped in the slot.