How the Bartels micropumps work
The functional principle of Bartels micropumps is easily explained:
A piezo ceramic mounted on a brass membrane deforms that membrane, when a voltage is applied. By the resulting downstroke, the medium is being squeezed out of the pump chamber below. Check valves on both sides of the chamber define the flow direction.
When the voltage decreases, the piezo's correspondent deformation causes an upstroke of the membrane. The medium is sucked in and the chamber is filled again. In every second, the pump can do several hundreds of such pumping cycles. The pumping performance achieved can be influenced by adjustment of the parameters amplitude, frequency and wave form of the electric control signal.