Filter Fan Quick-Fix Frame for Secure Snap-In Mounting
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Solution Overview
Problem
Filter fans with spring-elastic brackets face issues with insufficient catching in lacquered sheet metal cutouts due to rounded edges and lack of sharp edges, leading to potential disengagement and unfiltered air/moisture penetration.
Innovation Solution
A filter fan design with a continuously closed frame and plate-shaped brackets molded with slits forming spring-elastic snap-in tongues, providing secure snap-in connections for various sheet metal thicknesses and preventing air/moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spring-elastic brackets are molded on the frame, then the filter fan can be quickly fixed without additional mounting means, but the brackets cannot securely catch in lacquered sheet metal cutouts with rounded edges
Solution Approach 1:
The bracket is divided into multiple functional elements: a mounting surface for quick fixing, spring-elastic catch elements for secure engagement, and guide elements for alignment. This segmentation allows each element to perform its specific function optimally - the mounting surface provides ease of installation while the spring-elastic elements provide secure catching even in rounded cutouts
Solution Approach 2:
The bracket utilizes elastic deformation as a key parameter change mechanism. The spring-elastic material allows the catch elements to deform temporarily during insertion and then recover, creating a secure mechanical interlock with the sheet metal cutout. This elastic parameter change enables reliable catching without requiring sharp edges in the cutout
2Object-affected harmful factors
If the frame is configured continuously closed, then unfiltered air and moisture penetration is prevented, but the brackets cannot be effectively mounted on lacquered sheet metal surfaces
Solution Approach 1:
The continuously closed frame is segmented to include integrated mounting surfaces and quick coupling devices at specific locations. This allows the frame to maintain its protective continuous structure while providing discrete, optimized attachment points that can securely engage with lacquered sheet metal surfaces through the spring-elastic catch elements
Solution Approach 2:
The spring-elastic catch elements act as intermediaries between the continuously closed frame and the lacquered sheet metal surface. These intermediate elements bridge the gap between the two surfaces, providing secure mechanical engagement despite the rounded edges created by lacquer coating
3Stability of the object's composition
If the brackets are molded on the outside of the frame, then the frame remains continuous and sealed, but the catching corners are cramped on oblique contours reducing fit sureness
Solution Approach 1:
The bracket structure is segmented into distinct functional zones: a mounting surface area on the frame exterior, spring-elastic catch elements positioned for optimal engagement, and guide elements for alignment. This segmentation allows the catching corners to be positioned and oriented independently, providing precise fit without compromising frame continuity
Solution Approach 2:
The catch elements are designed to engage with the sheet metal surface in multiple dimensions - providing both radial engagement for secure catching and axial guidance for precise alignment. This multi-dimensional engagement compensates for the oblique contour issues and ensures precise fitting
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
Ensures secure and removable snap-in connections, preventing unfiltered air and moisture entry, and maintaining stability across different sheet metal thicknesses and lacquer coatings.
Implementation Method 1
Quick fixing devices in form of spring-elastic brackets are configured on the frame
Data Source
AI summary
The filter fan with a basic casing with a frame which is provided with quick fixing devices in form of spring-elastic preferably wing-type brackets is configured in such a manner that the frame is configured continuously closed all around its periphery and the brackets configured as plate-shaped blanks are molded on the frame, brackets which are provided with a number of slits for constituting spring-elastic snap-in tongues.