Patent ID: 6974310

Claim:
A screw extruder and gear pump arrangement for highly viscous media comprising: a screw shaft rotatably mounted in an extruder casing; a planet carrier carrying at least one rotatably mounted planet gear; a pump casing fixed to the extruder casing and surrounding the planet carrier; a first functional element cooperatively engaged with the at least one planet gear as a sun wheel; a second functional element cooperatively engaged with the at least one planet gear as an outer ring; only one of the functional elements having gear teeth which mesh with the at least one planet gear, the other functional element comprising a smooth-walled sealing region which bears in a sliding and sealing manner over the length and part of the circumference of the planet gear, the other functional element being fixed to the planet carrier; an inlet sealing wall fixed to the planet carrier, the inlet sealing wall rotating with the planet carrier and having at least one inlet opening for passing a medium to be delivered; an outlet sealing wall firmly connected to the planet carrier, the outlet sealing wall rotating with the planet carrier and having at least one outlet opening for passing a medium to be delivered; a suction chamber arranged upstream of the inlet sealing wall in a delivery direction and extending through the inlet opening into at least one suction chamber element along a respective at least one said planet gear to the outlet sealing wall; a pressure chamber enclosed by the pump casing, the pressure chamber arranged downstream of the outlet sealing wall in the delivery direction; at least one dividing wall extending from the inlet sealing wall to the outlet sealing wall, circumferentially offset from a respective said planet gear and separating a respective at least one suction chamber element from the pressure chamber, each said dividing wall being fixed to the functional element comprising a sealing region for bearing in a sliding and sealing manner over the length part of the circumference of the planet gear, and extending in the radial direction to the outer diameter of the gear teeth of the functional element comprising gear teeth for meshing with the planet gear.