Fire Extinguisher Ejection Channels Homogenization
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Solution Overview
Problem
Auxiliary pressure type fire extinguishers face issues with suboptimal homogenization of propellant gas and extinguishing agent, leading to residual powder buildup and prolonged pressurization times, reducing the effective capacity and efficiency of the extinguisher.
Innovation Solution
The design incorporates ejection channels through a transverse wall in the central tube to direct propellant gas directly into the extinguishing powder, creating a homogeneous mixture and accelerating pressurization, with features like deflectors and a piston assembly for controlled gas release and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If propellant gas is released from the cartridge into the body containing the extinguishing agent, then the extinguisher is pressurized for operation, but the homogenization of gas and extinguishing agent is not optimal causing residual powder buildup
Solution Approach 1:
The central tube is divided into an upper part and a lower part connected by a transverse wall, with ejection channels passing through the transverse wall. This segmentation allows the propellant gas to be directed through specific channels into the extinguishing agent, improving mixing and reducing residual powder buildup.
Solution Approach 2:
The ejection channels act as intermediaries between the propellant gas and the extinguishing agent. These channels direct the gas flow into the extinguishing agent in a controlled manner, ensuring optimal homogenization and preventing powder accumulation in dead zones.
2Reliability
If the cartridge is hermetically enclosed to avoid leaks, then storage safety is improved, but the time required to achieve complete pressurization of the device is prolonged
Solution Approach 1:
The ejection channels are pre-positioned and oriented to direct propellant gas flow optimally into the extinguishing agent. This preliminary arrangement of gas flow paths enables rapid pressurization once the cartridge is pierced, reducing the time required while maintaining the hermetic seal during storage.
Solution Approach 2:
The ejection channels are oriented at specific angles (e.g., 45 degrees) relative to the horizontal plane, creating three-dimensional gas flow patterns that accelerate homogenization and pressurization while the cartridge remains hermetically sealed during storage.
3Stability of the object's composition
If ejection channels are added to direct propellant gas into the extinguishing agent, then homogenization is improved and residual powder is reduced, but the device complexity increases
Solution Approach 1:
The transverse wall serving as a connector between the upper and lower parts of the central tube also functions as a mounting structure for the ejection channels. This multi-functional design achieves improved homogenization without proportionally increasing device complexity, as the transverse wall serves both structural and flow-directing purposes.
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 approach significantly reduces residual powder, ensures quick and efficient pressurization, and meets the EN3 standard for portable fire extinguishers by ensuring less than 10% powder remains after use, enhancing operational efficiency and capacity.
Implementation Method 1
one or more ejection channels passing through the transverse wall of said tube and allowing the propellant gas contained in said cartridge to be expelled directly into the extinguishing agent
Implementation Method 2
the homogenization of the gas and the extinguishing agent, once the gas is released from the cartridge and fills the body containing the extinguishing agent
Implementation Method 3
a piston assembly which is mounted, preferably by clipping, on the cartridge
Data Source
Figure 1
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Figure 3
AI summary
The apparatus (1) has a metallic cylindrical body i.e. bottle (2) containing an extinguishing agent (6) i.e. dry powder. A central tube (4) is provided inside the body and has a pressurized cylindrical cartridge (5) that contains expellant gas (7) i.e. carbondioxide. The body has a centralizer (8) with ejecting ducts i.e. ejectors (12) which traverse a transversal wall of the tube and expel the gas directly into the agent, where the centralizer is provided inside the tube. Deflectors (40) serve to direct the gas in the bottle along an angle of 30 degree during perforation of the cartridge. An independent claim is also included for a method for extinguishing fire.