Electronic model of membrane pump

R

René

Guest
I am looking for an electronic model of a membrane pump:

One side of the membrane is controlled with a constant pressure gas,
which is being switched on, and vented periodically.
On the other side of the membrane a fluid is being pumped (using 2
valves to give the fluid direction.

So far most things can be modelled in "electrical" form (P = V, I =
Flow etc) bet the membrane itself eludes me so far.

I firs naively thought a capacitor (diode pump config) would do, but
appearently this is not so.

For one, the membrane pump will always pump the same exact amount of
fluid each cycle, no matter what pressure is applied primarely, while
a capacitor can "pump" any amount of electrons, based on the voltage
applied primarely.

The pumping is controlled by the fact that secondarely the pressure of
the fluid remains constant, until the membrane hits the stop, after
which the pressure drops away, and the primary side of the membrane is
vented for a new cycle.

I feel stupid - but I cannot replicate this principle in an electronic
circuit......

Any pointers appreciated - TIA!

--
- René
 
On Tue, 14 Jun 2005 17:09:47 +0200, René wrote:

I am looking for an electronic model of a membrane pump:

One side of the membrane is controlled with a constant pressure gas,
which is being switched on, and vented periodically.
On the other side of the membrane a fluid is being pumped (using 2
valves to give the fluid direction.

So far most things can be modelled in "electrical" form (P = V, I =
Flow etc) bet the membrane itself eludes me so far.

I firs naively thought a capacitor (diode pump config) would do, but
appearently this is not so.

For one, the membrane pump will always pump the same exact amount of
fluid each cycle, no matter what pressure is applied primarely, while
a capacitor can "pump" any amount of electrons, based on the voltage
applied primarely.

The pumping is controlled by the fact that secondarely the pressure of
the fluid remains constant, until the membrane hits the stop, after
which the pressure drops away, and the primary side of the membrane is
vented for a new cycle.

I feel stupid - but I cannot replicate this principle in an electronic
circuit......

Any pointers appreciated - TIA!
Click to expand...
Charge pump maybe?

Bob
 
On Tue, 14 Jun 2005 17:09:47 +0200, René wrote:

I am looking for an electronic model of a membrane pump:

One side of the membrane is controlled with a constant pressure gas,
which is being switched on, and vented periodically.
On the other side of the membrane a fluid is being pumped (using 2
valves to give the fluid direction.

So far most things can be modelled in "electrical" form (P = V, I =
Flow etc) bet the membrane itself eludes me so far.

I firs naively thought a capacitor (diode pump config) would do, but
appearently this is not so.

For one, the membrane pump will always pump the same exact amount of
fluid each cycle, no matter what pressure is applied primarely, while
a capacitor can "pump" any amount of electrons, based on the voltage
applied primarely.

The pumping is controlled by the fact that secondarely the pressure of
the fluid remains constant, until the membrane hits the stop, after
which the pressure drops away, and the primary side of the membrane is
vented for a new cycle.

I feel stupid - but I cannot replicate this principle in an electronic
circuit......

Any pointers appreciated - TIA!
Click to expand...
The valves are diodes.

What happens to the state of charge on a capacitor when a constant
current is forced through it?

Good Luck!
Rich
 
On Tue, 14 Jun 2005 19:10:42 GMT, Rich Grise <richgrise@example.net>
wrote:

I firs naively thought a capacitor (diode pump config) would do, but
appearently this is not so.

For one, the membrane pump will always pump the same exact amount of
fluid each cycle, no matter what pressure is applied primarely, while
a capacitor can "pump" any amount of electrons, based on the voltage
applied primarely.



The valves are diodes.

What happens to the state of charge on a capacitor when a constant
current is forced through it?

Good Luck!
Rich
Click to expand...
I tried to model the whole thing as a charge pump - but this model is
clearly flawed.

Appearently, a constant current source is somehow involved, whereas
the membrane pump is subjected to a constant gas pressure (= Voltage)

It does not really add up..

--
- René
 
On Tue, 14 Jun 2005 19:10:42 GMT, Rich Grise <richgrise@example.net>
wrote:

I firs naively thought a capacitor (diode pump config) would do, but
appearently this is not so.

For one, the membrane pump will always pump the same exact amount of
fluid each cycle, no matter what pressure is applied primarely, while
a capacitor can "pump" any amount of electrons, based on the voltage
applied primarely.



The valves are diodes.

What happens to the state of charge on a capacitor when a constant
current is forced through it?

Good Luck!
Rich
Click to expand...
I tried to model the whole thing as a charge pump - but this model is
clearly flawed.

Appearently, a constant current source is somehow involved, whereas
the membrane pump is subjected to a constant gas pressure (= Voltage)

It does not really add up..

--
- René
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top