Plastic Pip Cap With Steel Insert For Fire Sprinkler Cost Reduction
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Solution Overview
Problem
The high cost and manufacturing complexity of traditional metal pip caps for sprinkler assemblies, such as those made from copper or brass, necessitate a less expensive and easier-to-manufacture alternative that maintains rigidity and corrosion resistance for proper seating and release in fire suppression systems.
Innovation Solution
A plastic pip cap with a stainless steel reinforcement insert is used, which is molded into the cap to provide structural integrity and support for the frangible bulb, combined with a spring seal for effective sealing and fluid flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal pip caps (copper or brass) are used, then rigidity and corrosion resistance are ensured, but manufacturing cost increases significantly
Solution Approach 1:
The patent employs a composite structure consisting of a plastic pip cap body combined with a metal reinforcement insert. This composite approach allows the majority of the component to be made from inexpensive plastic while incorporating metal only where structural strength and corrosion resistance are critical, thereby reducing overall material cost while maintaining necessary performance characteristics.
Solution Approach 2:
The metal reinforcement insert is strategically positioned within the plastic pip cap at specific locations where rigidity and corrosion resistance are most needed. This localized application of metal material ensures that the critical functional areas maintain high reliability while minimizing the use of expensive metal throughout the entire component, thus optimizing the cost-performance ratio.
2Reliability
If metal pip caps are used, then proper seating and release are achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The composite construction of plastic body with metal insert provides the necessary mechanical properties for reliable seating and release operations. The plastic material offers ease of molding into complex shapes required for proper engagement, while the metal insert provides the structural integrity and corrosion resistance needed for dependable operation, thereby achieving functional reliability without the complexity of machining entire metal components.
Solution Approach 2:
The patent replaces traditional metal machining operations with plastic molding processes for the main body of the pip cap. Plastic molding can more easily accommodate complex geometries and integrated features required for proper seating and release mechanisms, reducing manufacturing complexity compared to machining equivalent features into metal components.
Data Source
Figure 1~2
Figure 3~7
AI summary
A sprinkler assembly includes a sprinkler body having a base and a frame extending from the base. The base has a passage extending therethrough defining an inlet and an outlet. A deflector is mounted to the frame and spaced from the outlet, which is configured to deflect fluid flowing from the outlet in a radial pattern. A trigger assembly extends between the frame and the base and is adapted to support a plug in the outlet and release the plug when a temperature associated with a fire condition is detected. The plug is made from plastic and can include a reinforcing insert.