Vibrating air Pump and Vacuum Pump

[EranB]

Hi,
I am looking for an air pump which can provide (1) a stable DC pressure of 0 - 300 [mmHg], and (2) an AC pressure(on top of the DC pressure) with an amplitude of 0 - 30 [mmHg] a

http://www.eng-tips.com/threadminder.cfm?pid=407t

a frequency of 0 - 100 [Hz].
All these parameters (DC pressure, AC amplitude pressure, AC frequency pressure) should be controllable.
In order to simplify things I would prefer having an off-the-shelf pump which can be connected to my PC via an USB port and have compatible SW that allows the pressure control.

Finally, in addition to this positive pressure air pump, I would like to have similar pump but with negative pressure. The pump should provide the same pressure level as the pump described above, i.e. a vacuum pump which can provide DC pressure of 0 to (-300) [mmHg] and an AC pressure similar to the one described above. All should be controllable.

Do you happen to know such pumps?

 

[MikeHalloran]

There are no such pumps.

You may be able to do most of what you want with simpler pumps and E/P or I/P transducers, sort of like these:

http://fairchildproducts.com/subcat/13/High_Accuracy_Electro-Pneumatic_Transducers.php

You probably won't get the frequency range you've asked for.

I have no personal experience with it, but I think LabVIEW could become the software you need.



Mike Halloran
Pembroke Pines, FL, USA

 

[LittleInch]

I assume you're talking very low size here, but a pump needs to be described by flow as well as pressure (head). Given that you hvab't stated flow rate, it sounds to me like what you need is a vessel at your constant pressure and then some sort of vibating plate or piston which vibrates at your given frequency??

If there is flow then you should look more closely at some form of rapid acting control valve to modulate your pressure around the constant pressure.

All a bit too small scale and vague to really comment further I'm afraid.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[clay87]

Here's what you need:

 

[EranB]

Thanks for the replies.

Also, I don't mind using two pumps (say, one for DC and one for the AC pressure). Piston is a valid option, but I am not sure I can find off-the-shelf one. Are you familiar with one?
As for the flow rate: I thought of having certain constant leak in the system and keeping a flow of up to 1 [L/min].
At first I don't mind the size of the pumps as long as it produce the pressure I would like to have.

 

[Strong]

How about this little rotary lobe blower:

http://news.thomasnet.com/fullstory/Rotary-Lobe-Blower-is-6-in-long-and-weighs-1-75-lb-463104

Walt

 

[DRWeig]

Probably not relevant, but the hydraulic valves in my car's anti-lock brake system can pulse my brakes like crazy.

Best to you,

Goober Dave

Haven't see the forum policies? Do so now: Forum Policies

 

[Strong]

Search "small diaphragm pump" and check out Parker. Good luck finding something that is adjustable without some hacking!

Walt

 

[EranB]

Thank you all.
I will check with Parker their miniature diaphragm pumps:

http://ph.parker.com/us/12051/en/micro-diaphragm-pumps-air-gasup-to-2-5-slpm