HiI want to create a small ventilator

[shirel]

Hi

I want to create a small ventilator, which should be used in a glass water.
It doesn't have to be an electrical one, it can be also based on any other way (gasses, liquids, magnets, mechanics etc.). I want that the system of it will be outside the glass and in the glass I want to have only a kind of weather vane.

Do you have any idea?

Thanks in advance

 

[Dale]

I'm not sure exactly what you are describing. Are you talking about something like a fish-tank aerator (the little thing that bubbles air into the fish tank).

 

[shirel]

Actually it's very similar, I don't know how a fish-tank aerator makes bubbles
but what I mean is something like this:
http://wellcom.co.il/catalog/images/Zalman/CNPS7000-AlCu-Tr.jpg

that should be inside a glass of water.

 

[Danger]

It's still a bit confusing. Now it looks as if you want a heat exchanger to keep the water cool.

 

[shirel]

I've maybe added a wrong image to my previous comment, I need just a simple ventilator without all the metals, which are wrapping it in that photo.

I want to put it on the inner bottom of the glass in order to create a vortex in the water..

 

[Danger]

Okay, I think that I've got the picture now.
Your easiest approach might be magnetic coupling.
As a basis, I'll give you a very simple example that won't actually work properly but will give an idea of the principle.
Take the whole fan apparatus as shown, and bond powerful cylindrical magnets of alternating polarity at 90° separation around the outside perimeter of the hub. Then obtain the hub/blade part of a second fan and add magnets to it in the same manner. Drop that second set of blades upside-down into the bottom of the glass, and attach the glass to the top of the first motor/fan set. The magnets on the fan underneath will drag their opposite counterparts on the inside fan around with them as they revolve.

 

[shirel]

First of all, thank you very much for your lovely help!
Is there a chance you can draw me a sketch of the idea you were talking about?
Because I'm a little bit confused from all your explanations..

 

[Danger]

I'll give it a try. I haven't figured out how to use Inkscape yet, but maybe I can fire up my old G3 and do it in Illustrator.

 

[Dale]

What Danger is describing is called a http://en.wikipedia.org/wiki/Image:Magnetic_Stirrer.JPG" . In the linked picture you can see the white magnet bar which is the actual stirring mechanism, and you can see the vortex in the water. The magnetic stirrer bar is moved by rotating magnets inside the base plate.

 

[Danger]

Thanks, Dale. That's considerably simpler than what I was envisioning, and apparently quite effective.

 

[shirel]

Thank you very much
I'll really appreciate this !

 

[Danger]

You're more than welcome. Our only request is that you add your insights to others who show up here looking for answers.