Concealed Sprinkler Assembly Using Polymer Cap and Guided Deflector
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Solution Overview
Problem
Existing fire suppression sprinkler systems face challenges in manufacturing cost, complexity, and aesthetics, particularly due to the use of metal components that require multiple parts and assembly steps, and lack of concealment options for installation.
Innovation Solution
The sprinkler assembly incorporates a polymeric material like glass fiber enforced polyphenylene sulfide for reduced part count and lower manufacturing costs, and a cover plate assembly that conceals the sprinkler body while ensuring aesthetic integration with ceiling surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex metal parts and assembly processes are used, then manufacturing precision and reliability are improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent combines multiple functional components into integrated assemblies. The deflector assembly merges the deflector, guide pins, and retention features into a single unit that attaches to the sprinkler body. The cap assembly integrates the cap, sealing elements, and activation mechanisms into one component set. This merging reduces the total number of parts while maintaining reliability through integrated design.
Solution Approach 2:
The sprinkler body is designed with multi-functional features that serve multiple purposes. The body simultaneously provides structural support, fluid distribution channels, deflector mounting, and cap retention. The guide pins both position the deflector during assembly and serve as alignment features for the cap. This multi-functionality reduces the need for separate dedicated components.
2Strength
If conventional metal components are used, then strength and durability are improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the material parameter from traditional metal to polymer composite materials. The sprinkler body and components are manufactured using injection-molded polymers that provide sufficient strength for fire suppression applications while dramatically reducing manufacturing cost and complexity compared to metal casting or machining processes.
Solution Approach 2:
The patent employs composite material construction where polymer materials replace metal components. The deflector, body, and cap are all made from engineered polymers that combine strength, heat resistance, and ease of manufacturing. This composite approach maintains structural integrity while enabling cost-effective production through molding processes.
3Speed
If the deflector is freely movable, then activation response is improved, but fluid distribution control deteriorates
Solution Approach 1:
The guide pins serve as intermediary elements between the deflector and sprinkler body. These pins provide controlled guidance that allows the deflector to move freely in response to activation forces while simultaneously constraining the movement to precise paths that ensure accurate fluid distribution patterns. The guide pins mediate between free movement and controlled positioning.
Solution Approach 2:
The deflector is designed with dynamic characteristics that allow it to be stationary during normal conditions but move freely when activated. The retention features and guide pins create a system where the deflector transitions from a fixed position to a movable state upon activation, maintaining precision through the geometric constraints of the guide pin apertures while enabling rapid response.
Data Source
AI summary
A sprinkler assembly includes a body defining an inlet, an outlet, and a fluid passage extending along a longitudinal axis between the inlet and the outlet. A guide pin aperture is defined by at least one of the body or a bushing coupled to the body. The sprinkler assembly further includes a deflector slidably coupled to the body. The deflector includes a deflector body coupled to a guide pin. The guide pin includes a shaft portion extending through the guide pin aperture and a shoulder that is wider than the shaft portion and configured to engage at least one of the body or the bushing to limit movement of the deflector body away from the body.