Fog Chiller Induction Blower
Description
I built a beer-cooler fog chiller but the cooled fog just eeks out, and I wanted to get it the fog moving more efficiently. This Induced Fan duct is made to slip-fit into a 4" PVC pipe (I have a SCH 80 PVC pipe as my fog chiller's outlet duct), and with 2 USB-powered fans from you-know-where, it creates an impressive draft to draw the fog from the chiller. When moving fog, you want to avoid turbulent flow. The fans blow air into the duct, straightening vanes straighten the air, internal vanes draw the fog into that airstream and expel through the outlet. I started with one fan, wasn't impressed with the output, and decided to make a splitter (largely because two fans came in the package). I noticed that the fans weren't terribly efficient at drawing in air, and could tell that they blew air around at the suction as much or more than they were drawing in air (weird, I wondered if the fan direction was reversed from what an engineer would have recommended), so I created the inlet ducts for each fan. They then worked wonderfully, adding a forcing cone to direct air to the blades while ignoring the hub. A vape pen helped to prove function of air flow (you can blow on the intake of a pen to make "smoke" without drawing any in yourself). It worked well enough, but I felt I could improve upon the induction, after noticing stagnant fog/smoke at the outlet. I then made the tail piece and am now rather impressed with the result, especially considering the small size of the fans. The tail piece slips tightly into place. I kept it as a separate piece in this build, as removing supports from a 1-piece build would otherwise be nearly impossible. The tailpiece can be printed with little more than a brim, no supports, otherwise. the inside of the nacelle within the tailpiece is hollow to save filament (hey, I tried). The main body section will need support, but use support sparingly, removal went easier with a pair of hemostats. My first run was a disaster, with so much support that it was unusable. I can't speak for the screws I used, but they were out of the junk bucket, probably M6, possibly smaller, but I used a pair on each fan that secured the inlet, through the fan, into the downstream collector. (6) screws needed total (minimum). Your build will be more efficient and compact than mine, I went back and shortened up some pieces and removed some of the restrictions, which results in less plastic used as well. Fans: 50x50x10mm - 2-Pack 50mm Fan 5V USB Brushless DC Cooling Fan, 5V Brushless DC Cooling Fan for Projector Humidifier Aromatherapy Small Appliances Series Replacement https://www.amazon.com/gp/product/B09VX46THJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8 I use a high-capacity USB power pack with two outputs, made by PocketJuice. I'm not linking that here as any power packs will work. If you only wish to use a single fan, you can skip the splitter and skip one of the inlet ducts. Printed in PLA. Feedback is welcome, and would be interested to see how else it may be used.
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