Agilent Technologies TPS-mobile 9698400 Notice De Mode D'emploi page 346

17 Technical Information
Description of the TPS mobile
TPS-mobile versions equipped with RVPs are: 9698411, 9698403,
9698400, 9698417, 9698405, 9698419, 9698421, 9698424, 9698425,
9698426, 9698430 and 9698431.
A metal rotor is located (eccentric) into a round pumping chamber.
Two sliding vanes are placed in the rotor. The vanes are pushed
toward the stator wall either by springs. To make high-pressure
ratios achievable, the principal requirement of these pumps is that
the inlet and discharge always remain separated. This separation is
achieved placing the rotor in close proximity to the stator, the near
contact line being placed between the inlet and discharge, and spring
loading the blades so that they remain in contact with the stator. In
addition, oil is used to seal the end surfaces of the vanes and along
the entire length of the two vanes, as well as across the ends of the
rotor.
As said, the rotor in such pumps are placed inside the stator. Oil is
used in these pumps for a variety of purposes: to effect a seal
between the inlet and discharge areas, to lubricate, to fill the space
under the discharge valve, to serve as a heat transfer medium and
keep the rotor temperature within acceptable range, to flush
particulate matter out of the pump.
346/400 TPS-mobile User Manual / 87-901-005-01 (F)