Portable Fire Extinguisher Casing Design and Recoil Management
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Solution Overview
Problem
Existing portable fire extinguishing devices face issues such as environmental pollution, high maintenance costs, safety hazards in high-temperature environments, complex manufacturing processes, and potential recoil injuries due to deflagration, particularly with pressure-storage dry powder devices and handheld aerosol devices.
Innovation Solution
A portable fire extinguishing device with a casing composed of two half-casings and a fastening ring, allowing for simple assembly and uniform wall thickness, combined with an explosion venting device to manage recoil forces and improve safety, and annular ribs for structural strength and accurate cartridge location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cylindrical casing with non-uniform wall thickness is used to enhance structural strength, then the structural strength is improved, but the injection moulding process becomes complicated and manufacturing difficulty increases
Solution Approach 1:
The casing is divided into two separate half-casings that are assembled together, allowing each half to have uniform wall thickness for simplified injection moulding, while the assembled structure provides the required structural strength
Solution Approach 2:
The half-casings are designed with asymmetric features including clamping hooks and clamping holes that enable secure assembly, compensating for the reduced structural strength from uniform wall thickness
2Reliability
If the cartridge is fixed by extending into the bottom of the casing, then the fixing effect is achieved, but the assembly process becomes complicated and the fixing effect is difficult to control
Solution Approach 1:
The casing is segmented into two half-casings that clamp the cartridge from both sides, providing secure fixation without requiring the cartridge to extend into the bottom of the casing, thereby simplifying the assembly process
Solution Approach 2:
The clamping structure provides balanced fixation force from both sides of the cartridge, ensuring reliable fixing effect that is easy to control during assembly
3Productivity
If the cartridge deflagrates due to coating defect, pyrotechnic composition crack or gas channel blockage, then the aerosol is generated, but a powerful recoil force is generated that can injure the operator
Solution Approach 1:
The explosion venting device is pre-positioned to automatically activate during deflagration, creating a counteracting force that vents high-pressure gas away from the operator, thereby neutralizing the harmful recoil force before it can cause injury
Solution Approach 2:
The harmful high-pressure gas from deflagration is redirected through the explosion venting device to create a beneficial counteracting force that reduces recoil, converting a dangerous effect into a protective mechanism
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
The solution reduces recoil injuries, simplifies manufacturing, enhances safety, and improves the structural integrity and assembly of the device, effectively managing kinetic energy from deflagration and ensuring reliable fixing and accurate location of the cartridge.
Implementation Method 1
a great deal of aerosol smog will be generated by the cartridge through rapid stratified combustion
Implementation Method 2
after being cooled by a coolant layer, these high temperature aerosols will be ejected
Implementation Method 3
A coating defect, a pyrotechnic composition crack or a serious blockage of a gas channel may lead to a sudden rise of the pressure in the cartridge to deflagrate the pyrotechnic column
Implementation Method 4
effectively managing kinetic energy from deflagration
Data Source
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AI summary
Disclosed is a portable fire extinguishing device, which comprises a casing (1) and a cartridge (2) provided inside the casing (1). The device is characterized in that: the casing (1) comprises a first half casing (4), a second half casing (5) fitted to the first half casing (4), a fastening ring (6) and a bottom cover (7); the first half casing (4) and the second half casing (5) are butted; the fastening ring (6) is provided on the top ends of the first half casing (4) and the second half casing (5) so as to fasten the both; and the bottom cover (7) is provided at the bottoms of the both. The first half casing, the second half casing, the fastening ring and the bottom cover are clamped and fixedly connected with each other to form a whole casing so that the whole wall thickness of the casing is uniform, thus improving injection moulding processes, reducing the difficulty in manufacturing a mould, saving plastic resources, and facilitating installation and disassembly.