Spiral hot air gun nozzles - Page 1
Forum section: electronics / general

author: bitwelder
author_rank: Super Contributor
timestamp: January 13, 2021, 04:14:09 pm
content: Usually the hot air gun nozzles are straight, that is the end part of the nozzle is just a straight pipe (i.e. you can see through its hole)However, I've seen some nozzles that on the inside have kind of 'spiral', so the blowing air at the center of the nozzle instead of exiting directly through the pipe would probably start 'whirling' around before passing to the exit pipe.Are those nozzles useful, and in which situation?

author: thm_w
author_rank: Super Contributor
timestamp: January 13, 2021, 10:01:45 pm
content: The end of the hot air nozzle should not be open, it should have a mesh or spiral pattern there already. This is probably enough to mix up the air to make it relatively even temperature.Link or photo would help.

author: coppercone2
author_rank: Super Contributor
timestamp: January 15, 2021, 06:23:37 am
content: this is a feature on torches as well, seemingly backed by the HVAC industry

author: bitwelder
author_rank: Super Contributor
timestamp: January 15, 2021, 03:38:00 pm
content: Quote from: thm_w on January 13, 2021, 10:01:45 pmI wasn't able to find any photo online that show the 'spiral', but anyway this is the type of product:https://www.aliexpress.com/i/1005001407607925.htmlLater I'll take some photos of the nozzles I have and post them here.Edit: added photos from a 10 mm spiral nozzle seen from the inside (i.e. where it plugs to the hot gun) and the outside (the end pipe)

author: S. Petrukhin
author_rank: Super Contributor
timestamp: January 17, 2021, 06:53:57 pm
content: Twisting the air flow allows you to slightly condense it, focus it, and reduce the divergence to the sides. If you look at the just the chinese air termfen for soldering, you will see something similar to the impeller, a swirl flow.

author: arekm
author_rank: Unknown
timestamp: February 17, 2022, 03:54:47 pm
content: This video talks about this but using "helical wind" and "vertical wind" terms.According to it helical is "gentle airflow and low heat" and is for bigger elements like cpu, nand etc. Vertical is "concentrated airflow and high heat" and is used for small components like capacitor, resistor.Presented there sugon indeed contains both types of nozzles out of the box. quick 861d has only straight nozzles in the box.Another one:The problem with the both videos is that they mix terms, talks about these differently.I guess it is like this:- helical / spiral wind can be created by proper spiral nozzle (like on the photos above) OR by "fan" in the handle and straight nozzle (like in sugon 858d; where "fan" is causing spiral wind movement which is just blown out by nozzle almost directly)- vertical / straight wind - by station with straight nozzle and whatever type of "fan" is there but "fan" far from nozzle (so the air will straighten when it reaches the nozzle)In the comment under last video it's also mentioned that helical / spiral nozzle is creating much less "helicalish" wind than station with fan inside the handle.I have to admit that I never heard about these types before.My quick test of sugon 8620dx.The same temp/airflow settings, the same nozzle diameter (9mm diameter) but different type. 4 burns on top are with straight nozzle. The burns were becoming black almost immediately (like 3-4s). 4 burns on bottom are with "spiral" nozzle. It took much more time to these start becoming black - like 10-15s. I don't notice any difference in shape (last video above shows "ring" being created with spiral wind and different type of station). So to me spiral nozzle in this case (where nozzle is far from blowing engine) just stops a bit of heat and nothing more.Don't have any hot air with blowing engine inside handle to compare.Nozzles:

author: ygi
author_rank: Regular Contributor
timestamp: February 17, 2022, 06:03:24 pm
content: The second video sounds like a confused salesman pitch. It's trying to sell both stations when one is just a superior product that can do everything better than the cheap station for hobbyists. The cheap station can't roast components like the bigger one simply 'cause it's only half the power and 1/10th of the air pressure.You can create so called "helical wind" or "straight wind" with a good station using corresponding nozzles. OTOH his tissue test demonstrates how unevenly the cheap station blows but he wants buyers to believe it's a desirable feature.