Agilent TPS-mobile Instrucciones De Uso página 241

Technical Information
TPS-mobile versions equipped with RVPs are reported in the
"Description of the TPS-mobile" section.
Figure 87
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.
Agilent TPS-mobile User Manual 241