Dual Pressure Firefighting Nozzle with Adjustable Barrel
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Solution Overview
Problem
Firefighting teams face challenges in using both low-pressure, high-flow and ultra-high pressure, low-flow systems for effective fire extinguishment, as they require nozzles that can adapt to different pressure modes and flow rates while being operable in high-stress environments with heavy gear, and minimize the use of water and AFFF chemicals.
Innovation Solution
A nozzle design that allows switching between low-pressure, high-pressure, and ultra-high pressure modes, with adjustable gap sizes between the barrel and stem, and a shaper mechanism for changing between stream and fog spray patterns, enabling operation with both conventional and ultra-high pressure systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a nozzle is designed for low-pressure, high-flow operation, then it can deliver high flow rates to extinguish fires, but it cannot effectively operate with ultra-high pressure systems
Solution Approach 1:
The nozzle incorporates a movable barrel that can be positioned in different axial locations relative to the stem, creating different gap sizes. This dynamic adjustment allows the same nozzle to adapt to different pressure modes (low-pressure/high-flow vs. ultra-high-pressure/low-flow) by changing the fluid passage geometry, thereby resolving the contradiction between fixed flow rate design and pressure mode versatility
Solution Approach 2:
The nozzle changes the critical parameter of gap size between the barrel and stem to adapt to different operating conditions. By moving the barrel axially, the gap size is modified, which directly changes the flow characteristics and pressure drop across the nozzle, enabling it to function effectively across a wide range of pressure modes from low-pressure to ultra-high-pressure operations
2Loss of substance
If a nozzle is designed for ultra-high pressure, low-flow operation, then it uses less water to extinguish fires, but it cannot deliver high flow rates needed for certain fire types
Solution Approach 1:
The movable barrel mechanism dynamically adjusts the gap size between the barrel and stem, allowing the nozzle to switch between ultra-high-pressure/low-flow mode (narrow gap) for water conservation and low-pressure/high-flow mode (wide gap) for high flow rate requirements. This dynamic geometry change enables the nozzle to optimize water consumption while maintaining the capability to deliver high flow rates when necessary
Solution Approach 2:
The nozzle is designed with multi-functionality to handle both ultra-high-pressure low-flow applications (reducing water consumption) and low-pressure high-flow applications (providing high flow rates). The same nozzle structure with adjustable barrel position can serve multiple operational needs, making it universal for different fire types and water availability scenarios
3Adaptability or versatility
If a nozzle provides multiple pressure modes and spray patterns, then it increases versatility for different fire scenarios, but it increases device complexity
Solution Approach 1:
The nozzle uses a dynamic barrel position mechanism that can be adjusted to different axial locations to achieve different gap sizes and spray patterns. This single dynamic adjustment element (movable barrel) provides multiple pressure modes and spray patterns without requiring multiple separate nozzle components, thereby increasing versatility while limiting the growth of device complexity
Solution Approach 2:
The nozzle merges the functions of multiple pressure mode adjustments and spray pattern selections into a single integrated mechanism. By combining the pressure mode selection (via barrel position) and spray pattern control (via gap size) into one unified adjustable system, the design achieves high versatility without proportionally increasing device complexity
4Reliability
If a nozzle requires precise adjustment mechanisms for optimal performance, then it achieves better fire extinguishment efficiency, but it becomes difficult to operate with heavy firefighting gear
Solution Approach 1:
The nozzle design allows the barrel to be moved to different positions to self-adjust the gap size and optimize performance for different pressure modes and fire scenarios. This self-adjusting capability reduces the need for complex precision mechanisms that would be difficult to operate, as the firefighter can make coarse adjustments that are sufficient for effective operation even while wearing heavy gear
Data Source
AI summary
A nozzle for dispensing a fluid having a barrel having a proximal end and a distal end, the barrel having a passage defined by a first internal surface extending between the distal end and the proximal end, and an orifice defined by a second internal surface at the distal end of the barrel, a stem located at least partially in the barrel, the barrel is movable in relation to the stem to switch between a low pressure mode and a high pressure mode, a shaper located around an outer surface of the distal end of the barrel, the shaper being movable in relation to the barrel to switch between a low pressure fog mode and a low pressure stream mode. The nozzle is configured to dispense the fluid in a straight stream or fog in both the low pressure mode and the ultra-high pressure mode. The orifice is also configured to provide flushing capability for the ultra-high pressure mode while operating in the low pressure mode.