Hydrant Nozzle Cap Antenna for Vibration Leak Detection
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Solution Overview
Problem
Existing leak detection systems for fire hydrants are prone to false alarms due to background noise and are costly, with sensitive electronic components vulnerable to pressure changes and moisture, requiring expensive and time-consuming production and replacement.
Innovation Solution
A modular nozzle cap with a vibration sensor housed in a sealed cavity, featuring a metal insert and antenna for detecting leaks in fluid systems connected to fire hydrants, using a combination of metal and non-metal materials for durability and signal integrity, and a removable outer module for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensitive electronic components are housed in an enclosed cavity for protection, then reliability is improved, but pressure changes within the cavity create stresses on structural components leading to damage or failure
Solution Approach 1:
The cavity is divided into multiple sealed compartments by partitions, isolating electronic components from direct pressure stress while maintaining overall enclosure integrity. This segmentation allows pressure changes to be distributed rather than concentrated on single structural points.
Solution Approach 2:
The housing structure combines metal and non-metal materials to create a composite construction that provides both mechanical strength to withstand pressure changes and electromagnetic shielding for electronic component protection, reducing stress-related failures.
2Reliability
If the cavity is adequately sealed to protect electronic components from moisture, then reliability is improved, but production becomes expensive and time consuming
Solution Approach 1:
The housing is designed as modular segments that can be separately manufactured and then assembled with pre-formed seals, reducing the complexity of creating fully sealed enclosures from scratch and lowering production costs while maintaining protection effectiveness.
Solution Approach 2:
Flexible sealing membranes and gaskets are used at junctions between housing segments, providing effective moisture protection through simple compression sealing that is inexpensive to manufacture and install compared to complex welded or bonded sealed structures.
3Reliability
If electronic components are potted within the cavity for protection, then reliability is improved, but production becomes expensive and time consuming
Solution Approach 1:
Electronic components are mounted on separate circuit boards that are pre-assembled and tested, then installed as modular units within the housing, eliminating the need for time-consuming in-situ potting while maintaining protection through the sealed modular structure.
Solution Approach 2:
The design accepts that the entire nozzle cap assembly may need replacement rather than repairing individual electronic components, so robust but inexpensive housing materials and simple sealed structures are used that can be easily replaced as a unit, reducing overall system cost.
4Ease of manufacture
If an ordinary nozzle cap is used instead of a leak detection system, then cost is reduced, but leak detection capability is lost
Solution Approach 1:
The nozzle cap is designed as a universal base structure that can function as a simple cap or be upgraded with leak detection electronics, allowing the same fundamental design to serve both cost-sensitive applications and those requiring monitoring capabilities.
Solution Approach 2:
The leak detection system is implemented as a separate removable module that can be attached to or removed from the basic nozzle cap structure, allowing customers to choose whether to include the detection capability without requiring a completely different cap design, thus balancing cost and functionality.
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
Effectively detects leaks with reduced false alarms and extends the lifespan of electronic components by protecting them from environmental factors, while allowing for cost-effective and efficient maintenance and replacement of components.
Implementation Method 1
Leaks within the fluid systems can send vibrations through the fluid system and up the stand pipes to the fire hydrants. These vibrations propagating through the stand pipes and fire hydrants can be monitored to detect leaks within the connected fluid system.
Implementation Method 2
an antenna coupled to the substantially circumferential wall of the outer housing
Data Source
AI summary
Example aspects of a nozzle cap for a fire hydrant and a method of detecting a leak in a fluid system are disclosed. The nozzle cap for a fire hydrant can include an outer housing defining a first end, a second end opposite the first end, and a substantially circumferential wall extending from the first end to the second end; an antenna coupled to the substantially circumferential wall of the outer housing; a cap cover coupled to the outer housing at the first end; and an inner housing coupled to the outer housing at the second end.