Cavity Wall Box Elastomeric Ring for Noise and Smoke Sealing
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Solution Overview
Problem
Cavity wall boxes for electrical and electronic installations often fail to provide effective noise protection, windproofing, and smoke tightness without additional measures, and existing solutions do not adequately address these requirements simultaneously.
Innovation Solution
A cavity wall box design featuring a ring body made of elastomeric plastic, which provides sound decoupling and windproofing by resting against the borehole wall, and potentially includes intumescent components that expand to enhance smoke sealing, integrated into a multi-component injection molded part with a harder plastic body and softer plastic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cavity wall box is made with a hard plastic body for structural strength, then mechanical strength is improved, but sound insulation deteriorates
Solution Approach 1:
The cavity wall box combines hard plastic (for structural strength) and soft elastomeric plastic (for sound insulation) in a single integrated body. The soft plastic component forms a ring body that contacts the wall, creating a composite structure that simultaneously achieves both mechanical strength and sound insulation requirements.
2Object-affected harmful factors
If additional sound-damping measures are added to the cavity wall box, then sound insulation is improved, but device complexity increases
Solution Approach 1:
The sound-damping function is merged into the main body of the cavity wall box through the integrated soft plastic ring body, eliminating the need for separate sound-damping attachments or coatings. This integration reduces device complexity while maintaining effective sound insulation.
3Object-affected harmful factors
If the cavity wall box is designed with additional sealing components for windproofing, then windproofing is improved, but ease of installation deteriorates
Solution Approach 1:
The windproofing function is merged into the ring body structure itself. The soft plastic material and circumferential design of the ring body inherently provide sealing contact with the wall, eliminating the need for separate sealing components and simplifying installation.
4Object-affected harmful factors
If a circumferential ring body of soft elastomeric plastic is added to provide sound decoupling, then sound insulation is improved, but manufacturing complexity increases
Solution Approach 1:
The multi-component injection molding process manufactures the hard plastic body and soft elastomeric ring body as a single integrated part in one manufacturing step. This approach, while using composite materials, actually simplifies manufacturing compared to producing separate components that would require assembly.
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 design achieves effective noise protection, windproofing, and smoke tightness without additional tools, ensuring secure installation and improved sealing against smoke in the event of a fire.
Implementation Method 1
the ring body, when inserted into a can hole, rests against the borehole wall of the can hole... brings about a sound decoupling between the can body made of hard plastic and the wall providing the can hole
Implementation Method 2
such hollow-wall cans have inserts or attachments made of intumescent material, so that depending on the application, this foams up outside or inside the can body when heat is generated
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a cavity wall box 1 for building services installations, in particular electrical/electronic installation devices, comprising a box body 2 made of plastic formed by a base 4, a circumferential wall 3 and a mounting opening 5 opposite the base 4, with a support flange 8 projecting radially outwards and with means for fastening the cavity wall box 1, 1.1-1.5 in a box opening 25. The box body 2 has, on its outer surface adjacent to the support flange 8 on its side facing the base 4, a circumferential ring body 15 made of an elastomeric plastic material that is softer than the plastic material of the box body 2, the enclosing cylindrical surface of which has a larger diameter than the adjacent surface of the box body 2.