Micropump

Abstract

A pump includes: a stator (), a rotor () slidably and rotatably mounted at least partially in the stator, the rotor comprising a first axial extension () having a first diameter (D) and a second axial extension () having a second diameter (D) greater than the first diameter, a first valve (V) formed by a first valve seal () mounted on the stator around the first axial extension, in conjunction with a first channel () in the rotor that is configured to allow liquid communication across the first valve seal when the first valve is in an open position, a second valve (V) formed by a second valve seal () mounted on the stator around the second axial extension, in conjunction with a second channel () in the rotor that is configured to allow liquid communication across the second valve seal when the second valve is in an open position; a pump chamber () formed between the rotor () and stator () and between the first valve seal () and second valve seal (); and a pump chamber seal () circumscribing the rotor second axial extension and separating the pump chamber () from an external environment. The stator () further comprises a dead-zone seal section () surrounding a dead-zone volume () formed between the rotor second axial extension () and the stator (), wherein the dead-zone seal section () comprises axially extending portions () connected to upper and lower radial portions (') to form a closed sealing circuit.