Magnetically driven gear-pump heads and pumps are disclosed. An exemplary
gear-pump head includes a housing, a magnet cup, a pump driving gear, and
a pump driven gear. The housing has a pump axis and defines a pump
cavity. The magnet cup extends along the pump axis and contains a driven
magnet that is rotatable inside the magnet cup about the pump axis. The
driven magnet comprises a first driving gear. The pump driving gear has a
first gear axis, and the pump driven gear has a second gear axis. The
first gear axis is parallel to but laterally offset from the pump axis on
a first side of the pump axis. The second gear axis is parallel to but
laterally offset from the pump axis on a second side of the pump axis.
The pump gears are situated in the pump cavity and interdigitate with
each other such that rotation of the pump driving gear causes a
corresponding contrarotation of the pump driven gear. The pump driving
gear includes a second driving gear that interdigitates with the first
driving gear such that rotation of the driven magnet causes, via the
first and second driving gears, corresponding rotation of the pump
driving gear and contrarotation of the pump driven gear to pump liquid
through the pump housing.