ultra ultra small fans

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danny

Hi all,

I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much). It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling. The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?

Danny
 
Hi all,

I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much).
Click to expand...

I think you're going to need to start adapting it because
that is incredibly small for a crossblower.
It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling.
Click to expand...

It wouldn't matter if it did need to be powerful, you can't
get a lot of airflow out of a 10x25 fan cage, since you'll
have at least 15mm for the fan motor itself and the bracket.
The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?
Click to expand...


I don't know where to get such a tiny precision fan made,
but is it possible to do it another way? Perhaps a piece of
tubing and a pump external to this device?
 
The cheat you could do is get a old PC say athlon 450MHz PC
and take the fan off the heat sink that should do the trick
don't know if you can still by one. I have one but the dimensions
are length and width = 50 mm and height = 10mm. I think your dimensions
are wrong sorry if i am incorrect.
 
Thanks for the reply. I figured it would be rather difficult. But since
I heard some people are considering fans for cooling cellphones, there
got to be very small things around.

In my case, it's impossible to let air blow via an external pump. The
system is air tight and I actually need to measure gas concentrations,
so I cannot blow external air inside. There is an airflow of 100-200
ml/l through the system already, but I need the fan for better mixing
and a little bit cooling.

In theory I guess I could put the fan motor outside the system. But I
would need to make a relatively air-tight closure around the axis
(which i believe is possible, but I'd need a fan with a separate motor
in such a case).

What about other types of fans? I really prefer tangential, but perhaps
2 or three axial fans may provide a similar airflow. but they'd need to
be 10 to 15 mm long and wide I think.

danny
 
I actually own an old K6-2. But the fan on the heatsink is an axial fan
(as you say, about 50x50x10 mm). And I need a 10x10x40 mm crossblower
:(

danny
 
danny said:
Hi all,

I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much). It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling. The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?

Danny
Click to expand...

Perhaps a few of these?

http://www.ee.ic.ac.uk/optical/TimesArt.html

More sensibly, is it worth asking in a model-making NG?

Chris
 
danny said:
Thanks for the reply. I figured it would be rather difficult. But since
I heard some people are considering fans for cooling cellphones, there
got to be very small things around.

In my case, it's impossible to let air blow via an external pump. The
system is air tight and I actually need to measure gas concentrations,
so I cannot blow external air inside. There is an airflow of 100-200
ml/l through the system already, but I need the fan for better mixing
and a little bit cooling.

In theory I guess I could put the fan motor outside the system. But I
would need to make a relatively air-tight closure around the axis
(which i believe is possible, but I'd need a fan with a separate motor
in such a case).

What about other types of fans? I really prefer tangential, but perhaps
2 or three axial fans may provide a similar airflow. but they'd need to
be 10 to 15 mm long and wide I think.

danny
Click to expand...

Years ago, there was an innovation called a piezoelectric or
flapper fan. Someone in my group got a sample, and the thing
was a crock. Still, it is an interesting concept. Especially
if you need a noisemaker for parties :-)

It seems they've cranked the frequency of the thing, in an
attempt to take it out of the audible hearing range. Bet
that will piss off your pet dog, cat, or bat :-)

http://widget.ecn.purdue.edu/~CTRC/...iezoelectric/Miniature_Piezoelectric_Fans.htm

Paul
 
danny said:
Hi all,

I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much). It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling. The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?

Danny
Click to expand...

The cooling fans used in laptops are the some of the smallest I've seen.
I've seen laptop fans that are about 6x6x30mm.

Suggest you locate someone or a company that fixes laptops.
They are bound to have something to suit.
 
danny said:
Hi all,

I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much). It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling. The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?

Danny
Click to expand...

Here you go - 20x20x10mm
http://www.allproducts.com/manufacture11/sunon/0501pf.html


Small enough ?
 
No, it is an axial fan. But, looking around on that site I found
something they call micro "blower". I'm unsure about what exactly this
is, but if it produces a laminar flow over the full width of the fan,
it would be nearly as good. It is 25x25x10 but, the heigth (10 mm) is
my main constraint, in the depth I can probably increase it to 25 (but
for a tangential fan, this would not make sense).
 
This is actually quite interesting:)
However, from the looks of the video, the airflow is rather
uncontrolled with lots of turbulence. Still, I may as well try and send
them a mail. Thanks!
 
danny said:
I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much). It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling. The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?
Click to expand...

How about a larger fan and some simple ducts to direct the air flow?
 
danny said:
Thanks for the reply. I figured it would be rather difficult. But since
I heard some people are considering fans for cooling cellphones, there
got to be very small things around.

In my case, it's impossible to let air blow via an external pump. The
system is air tight and I actually need to measure gas concentrations,
so I cannot blow external air inside. There is an airflow of 100-200
ml/l through the system already, but I need the fan for better mixing
and a little bit cooling.

In theory I guess I could put the fan motor outside the system. But I
would need to make a relatively air-tight closure around the axis
(which i believe is possible, but I'd need a fan with a separate motor
in such a case).
Click to expand...

How about heat pipes with an external fan? You could easy put an
airtight seal around the pipes, allowing them to work in one
atmosphere at the cooling end, and in normal room air with a fan at
the other end.
 
danny said:
Hi all,

I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much). It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling. The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?

Danny
Click to expand...


How could you get any fan (circular spinning) in a 10x10x40 *tube*? The
rotor or blower fan would have to be a mere 10x10 regardless of the length
of the tube.
 
Vanguard said:
How could you get any fan (circular spinning) in a 10x10x40 *tube*? The
rotor or blower fan would have to be a mere 10x10 regardless of the length
of the tube.
Click to expand...

Thats not a problem. Laptop fans would fit in the original spec
request. But if you would rather lash something up quickly, open an old
cdrom and take out the motor that moves the laser head. Some of these
are 6mm diameter. Just add a prop, hand carved from a splinter or
something.

If for some reason you msut have tangential, cant help really.


NT
 
danny said:
I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much). It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling. The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?
Click to expand...

http://www.engineeringtalk.com/news/fan/fan107.html
 
danny said:
I'm looking for a very small tangential/crossblow fan for a piece of
self-build scientific equipment. However, the smallest tangential fans
I can find are around 20x20x150 mm. Unfortunately, I need something
that fits in a 10x10x40 mm space (well, I can slightly adapt the rest
to make a few mm more room, but not much). It doesn't have to be very
powerful, as it is mainly for creating a laminar airflow, and perhaps a
little bit cooling. The amount of sound it creates is no problem. It
does need to be able to work in a high-humidity environment though.

Hoping someone has a tip for a company where they sell or are willing
to build such a thing?
Click to expand...

Last post my mistake. Sorry....
 
I gave these microblowers i try. Last week i tested it and I think it's
gonna work!
Thanks all for your suggestions!

danny
 
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