Concealed Sprinkler Activation via Reflective Shield
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Solution Overview
Problem
Concealed fire suppression sprinklers experience delayed activation due to restricted heat and gas flow caused by a soldered cover plate, which melts only under high temperatures, slowing the activation of the sprinkler.
Innovation Solution
A fire suppression sprinkler assembly with a thermally conductive or semi-transparent cover plate and a reflective top plate that directs heat towards a heat-responsive element, accelerating the activation process by allowing heat and gas to reach the activator bulb more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cover plate is soldered in place to conceal the sprinkler, then the sprinkler remains concealed and aesthetically flush with the ceiling, but heat and combustion gas flow to the activator bulb is restricted, delaying sprinkler activation
Solution Approach 1:
The cover plate is divided into a first portion and a second portion that can separate from each other. The first portion remains attached to the ceiling to maintain concealment, while the second portion detaches to allow unrestricted heat and gas flow to the activator bulb, resolving the contradiction between concealment and activation speed.
Solution Approach 2:
The cover plate transitions from a static, fully attached state to a dynamic, partially detached state. The separable portions allow the cover plate to adapt its configuration based on thermal conditions, remaining concealed during normal operation and becoming partially open during fire activation.
2Speed
If the cover plate is made thermally conductive to allow heat transfer, then heat reaches the activator bulb faster, but the cover plate may activate at lower temperatures reducing reliability
Solution Approach 1:
Different portions of the cover plate have different thermal properties. The first portion maintains lower thermal conductivity to prevent premature activation, while the second portion has higher thermal conductivity to facilitate rapid heat transfer to the activator bulb when fire conditions occur.
Solution Approach 2:
A thermal barrier or insulating layer is introduced between the cover plate and the activator bulb mechanism. This intermediary element modulates heat transfer, allowing the cover plate to be thermally conductive overall while preventing direct heat transfer that would cause premature activation.
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
This design reduces the time required for sprinkler activation, enabling faster suppression of fires by focusing heat energy directly at the activator bulb, thus expediting the release of fire suppression fluid.
Implementation Method 1
A reflective shield has a reflective interior surface. The reflective shield is positioned substantially opposite the cover plate adjacent the first end of the sprinkler such that heat reflects from the top plate towards the heat responsive element.
Implementation Method 2
A cover plate is positioned adjacent the heat responsive element and includes a thermally conductive cover layer.
Implementation Method 3
Heat from the cover plate is transmitted to the air formed within a cavity of the cover plate. The heated air within the cavity is channeled to a heat responsive element located at a first end of the sprinkler such that the heat responsive element activates the sprinkler.
Data Source
AI summary
A fire suppression sprinkler assembly coupled to a mounting surface includes a sprinkler having a heat responsive element arranged adjacent a first end. A cover plate is positioned adjacent the heat responsive element and includes a thermally conductive cover layer. A reflective shield has a reflective interior surface. The reflective shield is positioned substantially opposite the cover plate adjacent the first end of the sprinkler such that heat reflects from the top plate towards the heat responsive element.