Conduit Passage Sealing with Foam Compression for Easy Cable Routing
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Solution Overview
Problem
Existing cable bushing sealing devices face difficulties in easy cable guidance and effective smoke tightness, with mechanically locking systems prone to user error and denser constructions, while other types struggle with resistance and sealing efficiency.
Innovation Solution
A sleeve-like housing with an elastically compressible foam body and adjustable tensioning devices allows for easy cable insertion and automatic sealing, using a tension band to compress the foam body for effective sealing against smoke and gases, with optional fire-retardant materials and mechanisms for self-closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing system with bending resistance is used to achieve smoke tightness, then sealing effectiveness is improved, but cable routing becomes difficult due to resistance
Solution Approach 1:
The sealing system transitions from a static bent state to a dynamic state where the foam body can be compressed and expanded. During installation, the foam body is compressed to allow easy cable passage, then automatically expands to provide effective sealing, resolving the contradiction between ease of operation and sealing effectiveness.
Solution Approach 2:
The physical state of the foam body is changed from compressed (during installation) to expanded (during sealing). This parameter change allows the same component to provide both easy cable routing when compressed and effective sealing when expanded, eliminating the need for bending resistance.
2Reliability
If a mechanically locked sealing system is used to achieve airtightness, then sealing effectiveness is improved, but the system requires manual operation and may be forgotten to be closed
Solution Approach 1:
The foam body automatically performs the sealing function without requiring manual operation. After cables are inserted and the tensioning device is released, the foam body self-expands under the action of the tension band to provide automatic sealing, eliminating the need for manual closing operations and preventing forgetting to close the system.
Solution Approach 2:
The manual mechanical locking system is replaced with an automatic elastic recovery system. The foam body's elastic properties substitute for manual locking mechanisms, providing automatic sealing through elastic recovery after compression, thereby eliminating the need for user intervention.
3Reliability
If a dense construction is used to achieve sealing, then smoke tightness is improved, but the device complexity increases
Solution Approach 1:
The sealing system uses a composite structure combining a tension band (providing tensile force) with a foam body (providing sealing surface). This composite material approach achieves effective sealing with a simpler construction than dense single-material structures, resolving the contradiction between smoke tightness and device complexity.
Solution Approach 2:
The sealing function is segmented into two components: the tension band that provides the compressive force and the foam body that provides the sealing surface. This segmentation allows each component to be optimized independently, achieving effective sealing with reduced overall complexity compared to dense monolithic constructions.
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
The solution enables effortless cable routing with no resistance and reliable sealing against smoke, gases, and potentially liquids, with automatic closure mechanisms ensuring consistent performance.
Implementation Method 1
An elastically compressible foam body (7) is arranged in the passage channel (5)
Implementation Method 2
the foam body in the passage channel is always pre-compressed, at least by the side walls, completely closing its opening cross-section
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention relates to a device (1) for sealing a pipe penetration, comprising: - a sleeve-like housing (2) with four flat side walls that define an axial passage (5) for the passage of pipes (6); - a compressible foam body (7) arranged in the passage (5), which, in its pre-compressed state solely by means of the side walls, completely closes an opening cross-section of the passage (5) and seals at least against smoke; - two tensioning devices (9, 10) that are axially attached to both sides of the foam body (7) in the passage or to its end faces (11, 12) and are designed for tensioning an elastic tension band (8) which is attached at its ends to each of a tensioning device (9, 10) and runs between the foam body (7) and a first side wall (3);-whereby the tensioning devices (9, 10) are adjustable between a sealing position in which the tension band (8) is relaxed and has no effect on the foam body (7), and an opening position in which the tension band (8) is tensioned and presses the foam body (7) away from the first side wall (3) against an opposing second side wall (4) and thereby exposes part of the opening cross-section.;