Fire-stop Conduit Sealing with Segmented Housing and Stops
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Solution Overview
Problem
Existing fire-stop devices for conduits can only be mounted on conduits extending through walls or ceilings with a distance from a second parallel wall or ceiling, limiting their installation flexibility and reliability in sealing yieldable conduits during fires.
Innovation Solution
A fire-stop device with a housing having a side-open receptacle and stop mechanisms that guide and limit the displacement of a cutting and blocking member, allowing for precise positioning and sealing of conduits adjacent to walls or ceilings, using intumescent material as a drive element for effective sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fire-stop device uses a closed housing structure to protect the cutting member, then the device provides better protection and stability, but it cannot be mounted on conduits adjacent to walls or ceilings
Solution Approach 1:
The housing is divided into two parts: a first housing part that is open at the side remote from the cutting and blocking member, and a second housing part that closes the housing. This segmentation allows the device to be mounted on conduits adjacent to walls or ceilings while still providing protection when needed.
Solution Approach 2:
The receptacle is made open at its side remote from the cutting and blocking member, creating an opening that allows the device to be mounted in previously inaccessible locations (adjacent to walls or ceilings), thereby adding a new dimension of installation flexibility.
2Reliability
If the cutting and blocking member is allowed to displace freely in the housing, then the device can respond quickly to fire, but the cutting member may be displaced too far causing faulty function
Solution Approach 1:
Stops are provided in the housing that define the blocking position of the cutting and blocking member. These stops provide feedback control by physically limiting the displacement of the cutting member, ensuring it does not travel too far and causing faulty function, while still allowing quick response to fire.
Solution Approach 2:
The stops provide visual and physical indication of the blocking position, allowing the cutting member to be precisely positioned and preventing over-displacement that would cause faulty sealing.
3Ease of operation
If the receptacle is closed at all sides to protect the conduit, then the device provides better protection, but the conduit cannot be easily inserted or displaced during mounting
Solution Approach 1:
The receptacle is segmented to be open at the side remote from the cutting and blocking member, allowing easy insertion and displacement of the conduit during mounting, while the first and second housing parts provide protection when closed.
Solution Approach 2:
The housing structure transitions from an open state during mounting to a closed state during operation, providing dynamic protection that adapts to the different phases of device usage.
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
Enables reliable and precise sealing of conduits by allowing installation directly adjacent to other walls or ceilings, preventing faulty functions and ensuring flue gas-proof sealing through precise guidance and expansion of intumescent material.
Implementation Method 1
a drive element for displacing the cutting and blocking member in case of fire
Data Source
AI summary
A device for closing a conduit (30) in case of fire includes a housing (11) having a receptacle (17) for receiving the conduit (30), a cutting and blocking member (20) arranged in the housing (11) and displaceable, in case of fire, by a drive element out of the housing (11) over the receptacle (17) to its blocking position (42) for cutting the conduit (30) off and closing same, with the housing (11) having at least one stop (15) that cooperates with a counter-stop (25) provided on the cutting and blocking member (20) and defines the blocking position (42) thereof the cutting and blocking member (20).