Rotary pump with telescoping rotor sections that vary the flow rate

An aircraft engine comprising:

• a thermal engine drivingly engaging an engine shaft;
• and
• a fluid system for circulating a fluid to a component, the fluid system having a pump fluidly connecting a reservoir of the fluid to the component, the pump having:
• a housing having an inlet fluidly connected to the reservoir and an outlet fluid connected to the component, the housing including a static wall, a peripheral wall extending from the static wall around an axis, and a movable wall in sealing contact with the peripheral wall;
• the static wall, the peripheral wall, and the movable wall defining a rotor cavity therebetween, the rotor cavity fluidly connected to the inlet and the outlet;
• a rotor drivingly engaged by the engine shaft and movably contained within the rotor cavity for orbital revolutions around the axis, the rotor having two sections axially movable relative to one another and both extending between two apexes in sealing contact with the peripheral wall of the housing during the orbital revolutions, the rotor having a volume being variable with movements of the two sections relative to one another;
• an actuator operatively connected to the movable wall of the housing and operable to displace the movable wall along the axis and relative to the static wall;
• and
• a biasing member operatively connected to the two sections of the rotor to bias the two sections away from one another to follow a movement of the movable wall.

A pump for an aircraft engine, comprising:

• a housing defining an inlet and an outlet, the housing having walls enclosing a rotor cavity communicating with the inlet and the outlet, the walls including a static wall, a peripheral wall extending around an axis, and a movable wall in sealing contact with the peripheral wall;
• an input shaft extending through the housing and parallel to the axis;
• a rotor drivingly engaged by the input shaft and movably contained within the rotor cavity of the housing for orbital revolutions around the axis, the rotor having two end rotor walls and a peripheral rotor wall extending between the two rotor end walls, the rotor having two apexes sealingly contacting the peripheral wall of the housing during the orbital revolutions, the rotor having two sections movable relative to one another to vary a distance between the two rotor end walls;
• an actuator operatively connected to the movable wall for moving the movable wall relative to the static wall to vary a volume of the rotor with movement of the movable wall;
• and
• as biasing member for biasing the two sections of the rotor away from one another.