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Electronic model of membrane pump

Discussion in 'Electronic Design' started by René, Jun 14, 2005.

  1. René

    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!
     
  2. Bob Stephens

    Bob Stephens Guest

    Charge pump maybe?

    Bob
     
  3. Rich Grise

    Rich Grise Guest

    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
     
  4. René

    René Guest

    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..
     
  5. René

    René Guest

    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..
     
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