Fire Apparatus Fluid Delivery With Non-Uniform Agent Metering
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Solution Overview
Problem
Existing fire apparatuses face challenges in efficiently mixing and delivering water and fire suppressant agents at precise ratios for effective fire extinguishment, often resulting in inefficiencies and excess agent usage.
Innovation Solution
A fluid delivery system for fire apparatuses incorporating a water circuit, agent circuit, and a ratio controller with an agent metering valve that includes a non-uniform profile or a combined metering and shut-off valve assembly, allowing for precise control of agent-to-water ratios through self-adjusting or manually controlled metering valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional metering valves are used to control agent flow, then the system structure is simple, but the precision of agent-to-water ratio control is insufficient
Solution Approach 1:
The flow restrictor incorporates a non-uniform profile with varying restriction levels at different locations, allowing different regions to control different aspects of flow. This enables precise agent-to-water ratio control by locally adjusting restriction characteristics without requiring complex multi-component valve assemblies.
Solution Approach 2:
The metering valve integrates multiple functions (flow restriction, ratio control, and shut-off capability) into a single unified component structure. This merging of functions achieves precise ratio control while minimizing overall device complexity compared to separate valve assemblies.
2Productivity
If manual metering valves are used for agent control, then the device complexity is low, but the productivity and response speed are reduced
Solution Approach 1:
The system enables dynamic adjustment of agent flow rates through electronically controlled metering valves that can respond in real-time to changing fire conditions. This dynamic control capability significantly improves productivity and response speed compared to static manual metering while maintaining manageable system complexity through integrated control architecture.
3Reliability
If excess agent is used to ensure sufficient fire suppressant delivery, then the reliability of fire extinguishment is improved, but the loss of substance increases
Solution Approach 1:
The system incorporates feedback mechanisms that monitor actual agent delivery and water flow rates, allowing the control system to adjust metering valve positions in real-time. This feedback control ensures reliable fire extinguishment effectiveness while minimizing excess agent usage by precisely matching actual delivery needs to required suppressant amounts.
Solution Approach 2:
The system dynamically changes operational parameters such as metering valve opening degrees and flow restrictor characteristics to optimize agent delivery. By continuously adjusting these parameters based on actual fire conditions and delivery requirements, the system achieves reliable extinguishment effectiveness while reducing waste from excess agent usage.
Data Source
AI summary
A fluid system of a fire apparatus includes a water circuit, an agent circuit, and a ratio controller. The agent circuit includes an agent metering valve. The agent metering valve includes a flow restrictor having a non-uniform profile. The ratio controller is configured to (a) receive water from the water circuit and agent from the agent circuit and (b) provide an agent-water solution.