Dry Sprinkler Assembly Centering Wall for Unobstructed Flow
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Solution Overview
Problem
Existing dry sprinkler assemblies face challenges in facilitating the positioning and translation of internal components while minimizing surface contact between these components and the housing, which can interfere with fluid flow and affect the efficiency of fire suppression.
Innovation Solution
The dry sprinkler assembly features a tubular outer housing with a cantilevered centering wall and internal landing surface, along with a fluid control assembly that includes a seal subassembly and fluid flow tube, designed to minimize interference by ensuring dissimilar and non-parallel surfaces, allowing for centralized axial translation and full opening of the sprinkler assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If internal components are positioned close to the housing to compact the assembly, then device complexity is reduced, but surface contact between components and housing increases causing fluid flow interference
Solution Approach 1:
The patent introduces a cantilevered centering wall that extends radially into the housing, creating a new spatial dimension for component positioning. This wall provides a landing surface that centers the fluid control assembly axially while maintaining radial clearance, allowing compact positioning without increased surface contact. The centering wall transforms the positioning problem from a radial clearance issue to an axial positioning issue, resolving the contradiction between compactness and fluid flow interference.
Solution Approach 2:
The cantilevered centering wall acts as an intermediary structure between the housing and the fluid control assembly. Instead of the assembly components directly contacting the housing surfaces, the centering wall mediates the interaction by providing a dedicated landing surface and maintaining clearance. This intermediary structure enables precise positioning while preventing harmful surface contact and fluid flow interference.
2Productivity
If internal components are positioned to minimize surface contact with housing, then fluid flow efficiency is improved, but positioning and translation of components becomes more difficult
Solution Approach 1:
The centering wall creates a dedicated axial positioning feature that simplifies component placement. By providing a landing surface at a specific axial position, the wall guides the fluid control assembly into the correct position during installation and operation, making positioning easier while maintaining the clearance needed for fluid flow efficiency.
Solution Approach 2:
The cantilevered centering wall is pre-positioned within the housing during manufacturing, establishing the correct axial and radial position for the fluid control assembly before operation. This preliminary positioning action eliminates the need for complex alignment procedures during installation and ensures optimal fluid flow characteristics from the start.
3Object-generated harmful factors
If dissimilar and non-parallel surfaces are used between internal components and housing, then fluid flow interference is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The housing internal surface is segmented into distinct functional zones: a smooth bore surface for fluid flow, and a cantilevered centering wall with specific geometric features for component positioning. This segmentation allows each surface to be optimized for its specific function - the bore surface for minimal flow resistance and the centering wall for precise positioning - without requiring the entire housing to meet high precision requirements.
Solution Approach 2:
The patent applies different surface qualities to different locations within the housing. The main bore maintains a smooth, simple cylindrical surface for optimal fluid flow, while the local region of the centering wall features specific geometric characteristics (cantilevered structure, landing surface) for positioning. This local differentiation of surface quality achieves fluid flow efficiency without imposing high precision requirements on the entire housing manufacturing.
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 enhances fluid flow efficiency by minimizing interference between internal components and the housing, ensuring rapid and effective fire suppression with a preferred K-factor range of 16.8 [GPM/(psi)½] to 33.6 [GPM/(psi)½], and supports fast response to fire with a response time index (RTI) of 50 (m-s)½ [100 (ft-s)½] or less.
Implementation Method 1
a thermally responsive trigger assembly (40) disposed between the fluid deflection member (30) and the outlet opening (24)
Data Source
AI summary
Automatic dry sprinkler assemblies for fire protection systems. Preferred embodiments of the automatic dry sprinkler assemblies include a tubular outer housing having an inlet, an outlet opening, and an internal surface configuration proximate the outlet opening that defines an internal landing surface and a cantilevered centering wall. A fluid deflection member is spaced from the outlet opening along a fluid flow path of the assembly. A fluid control assembly disposed within the outer housing for axial translation from an unactuated state to an actuated state of the sprinkler assembly to control fluid flow from the inlet to the outlet for fluid discharge along the fluid flow path to the deflection member. The internal landing surface and cantilevered centering wall are axially spaced from one another proximate the outlet opening to circumscribe and confront components of the fluid control assembly to facilitate centering and axial translation of the fluid control assembly.