Self-supporting air-conditioning duct
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Solution Overview
Problem
In self-supporting air conditioning ducts, the tongue-and-groove coupling method often results in irregularities due to molding curvatures, leading to potential detachment of insulating material particles during mechanical cleaning or maintenance, which can be swept into the duct by air flow.
Innovation Solution
A tongue-and-groove coupling with an oblique cut is used, where an aluminum layer or coating is applied to the panels, extending slightly beyond the edge of one panel to overlap the adjacent panel, creating a sealed and more resistant joint, preventing particle detachment and enhancing mechanical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a tongue-and-groove coupling with perpendicular cuts is used to join panels, then the panels can be assembled together to form the duct structure, but the molding curvatures cause cavities and irregularities at the joints, compromising the sealing quality
Solution Approach 1:
The patent applies asymmetry by changing the cut orientation from perpendicular to oblique relative to the panel longitudinal axis. This asymmetric cutting angle compensates for the symmetric molding curvatures, allowing the tongue-and-groove elements to interlock more precisely despite the curved panel surfaces, thereby eliminating cavities and improving joint sealing quality
Solution Approach 2:
The patent changes the geometric parameter of the cut angle from 90 degrees (perpendicular) to an oblique angle. This parameter modification allows the coupling surfaces to better conform to the curved panel geometry, maintaining manufacturing simplicity while achieving superior joint fit and sealing
2Strength
If the aluminum coating layer extends beyond the panel edge to overlap adjacent panels, then mechanical resistance and sealing are improved, but the device complexity increases due to additional coating extension requirements
Solution Approach 1:
The patent merges the coating layer function with the structural joint design by extending the aluminum coating beyond the panel edge. This integration allows the coating to serve dual purposes: providing corrosion protection and creating an overlapping seal that enhances joint mechanical resistance, thereby improving strength without requiring separate sealing components
Solution Approach 2:
The aluminum coating is applied in advance during panel manufacturing to extend beyond the cut edge, rather than adding separate sealing elements during assembly. This preliminary action ensures the coating is already in position to provide mechanical resistance and sealing when panels are joined, simplifying the overall device while enhancing joint strength
Data Source
Figure 1
AI summary
The invention relates to a tongue-and-groove coupling between panels of self-supporting air-conditioning ducts and the like, of the type that is provided in order to establish an optimum fit of the canted edge corresponding to the panels that are coupled in a tongue-and-groove manner, and also, to avoid the air coming into contact with the core of the duct therein. To this end, the panels consist of a core of insulating material complemented by an outer layer and inner layer based on aluminum or some other coating, the juxtaposing canted edge or edge between the panels having an oblique cut in relation to the horizontality or longitudinal intermediate line in the joint between the two panels; the aluminum layer or coating, which determines the inner face of the duct, extending beyond the edge of the panel, and being fixed to the oblique surface that defines the coupling profile.