Ventilation Duct Tube Coupling for Leak-Proof Tool-Free Assembly
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Solution Overview
Problem
Existing methods for connecting tube elements in ventilation duct systems are cumbersome, require special tools, and often result in air leakage and structural weaknesses, with previous solutions either requiring separate parts or weakening the tube walls through cuts.
Innovation Solution
A method where the inner tube is provided with continuous coupling means that engage with corresponding coupling means on the outer tube, allowing for a quick and secure connection without additional tools, with the coupling means being formed on the inner tube's end portion and outer tube's depressions to create a stable and leak-proof joint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fastening means (screws or rivets) are driven through overlapping tube wall section, then the tube elements are securely connected, but the connection becomes cumbersome, time-consuming and requires special tools
Solution Approach 1:
The invention extracts and eliminates the need for separate fastening means (screws, rivets, drilling tools) by integrating the coupling function directly into the tube elements themselves. The coupling means are formed as integral parts of the tube walls, allowing direct engagement without external fastening components or specialized tools.
Solution Approach 2:
The invention merges the functions of the tube wall structure and the coupling mechanism into a single integrated design. The coupling means are formed directly on the tube elements, combining the structural integrity of the tube wall with the connecting function, thereby eliminating separate fastening components.
2Reliability
If fastening means are driven through tube walls, then the tube elements are connected, but projections into the duct cause air leakage and dust accumulation
Solution Approach 1:
The invention applies local quality by designing the coupling means to engage from the interior side of the tube elements, creating a smooth interior surface that maintains uniform air flow characteristics. The coupling features are shaped to provide secure connection while preserving the aerodynamic quality of the duct interior, preventing turbulence, dust accumulation, and air leakage.
3Reliability
If hook-like cuts are made through tube wall, then coupling engagement is achieved, but the tube walls are weakened
Solution Approach 1:
The invention merges the coupling function with the tube wall structure by forming integral coupling means that are continuously connected to the main tube body. This integration ensures that the coupling features do not compromise the overall structural integrity of the tube walls, as they are not separate cutouts but rather continuous formations.
Solution Approach 2:
The coupling means are pre-formed on the tube elements during manufacturing, eliminating the need for subsequent cutting or drilling operations. This preliminary formation of coupling features prevents damage to the tube walls that would occur during post-manufacturing modifications.
4Reliability
If separate coupling devices are used, then tube elements can be connected, but the fitter has to handle separate parts
Solution Approach 1:
The invention merges the coupling function directly into the tube elements themselves, eliminating separate coupling devices. The coupling means are formed as integral parts of the tube elements, allowing direct engagement between tube ends without requiring additional components such as coupling rings, clamps, or fasteners.
Solution Approach 2:
The tube elements are designed with multi-functionality, serving both as structural conduits and as self-contained coupling devices. The same tube element that transports air also provides the coupling mechanism for connection, eliminating the need for separate coupling components and simplifying the overall system.
Data Source
Figure 1
Figure 2~6
Figure 7~10
AI summary
in an arrangement for connecting tube elements of a ventilation duct system, the inner lube (3) has an abutment (7) for engagement with a matchmg abutment (8) of the outer tube (1). By insertion of the inner tube (3) into the outer tube (1) the abutments (7, 8) are brought into engagement in a plane (P) perpendicular to the direction of insertion for providing coupling between the abutments and thereby connection of the tubes (1, 3). The abutment (7) of the inner tube (3) is continuous along the circumference of the tube (3) and formed in a bent end portion (20) of the inner tube (3).