Fire Extinguisher

Fire Extinguisher
Fire Extinguisher Cross section

For today's post I decided to make a fire extinguisher.  This was a really fun project to build.  I was not sure exactly sure how the inside of the fire extinguisher worked but with some research and some designing on my end this is what I came up with.  My idea is there is a CO2 canister that when the handle is squeezed it punctures the canister releasing the CO2.  This then compresses the fluid that is in the can.  When the handle closes this also open a value.  The extinguishing liquid travels up the tube and out towards the fire.  The tank was created using a revolve feature as the entire part was symmetrical about the vertical axis.   The top of the extinguisher was created using a number of extrusions and a swept feature for the threads.  This part was rather fun to make as there were a lot of different contours and cuts that I needed to make so that it would be functional.  The hose on the inside and outside were both created using sweeps with the thin option.  This allowed me to create just the outside profile and then set the thickness that I wanted for the entire tube.  Another part that was a challenge was the part that connected the CO2 canister as well as the inner hose.  This part needed to have ports that would let the CO2 out as well as a hole for the hose.  The ports were created using a revolved cut so that they would be tangent to the dome on the inside of this part.  The dome was made so that the escaping CO2 gas would be channeled out through these ports.  I included a section view of the model so that you would be able to see the inside.  Feel free to download the model and take a closer look.  Enjoy!


Ian Jutras

Worcester Polytechnic Institute

Mechanical Engineering 2013

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