Rotary lobe pump with internal bearing

A rotary lobe pump for conveying a particle-laden conveyed liquid, comprising:

• a pump housing with a pump room;
• an inlet opening and an outlet opening;
• a first, multi-lobe rotary piston, which is arranged in the pump room and is rotatably mounted about a first axis of rotation;
• a second multi-lobe rotary piston, which is arranged in the pump room, and is rotatably mounted about a second axis of rotation spaced apart from the first axis of rotation and meshingly engages in the first rotary piston;
• wherein the first and the second rotary pistons are drivable in opposite directions and are designed to generate a flow of the conveyed liquid from the inlet opening through the pump room to the outlet opening by counter-rotation about the first and second axis of rotation, respectively;
• a drive device arranged on one side of the pump housing, which is mechanically coupled to at least one of the first or second rotary pistons for driving the at least one of the first or second rotary pistons;
• a first fixed axle body, which is arranged inside the first rotary piston and connected to the pump housing on the side of the drive device;
• and
• at least one first bearing for rotably supporting the first rotary piston about the first fixed axle body, wherein the bearing is arranged on an outer surface of the first fixed axle body and inside the first rotary piston;
• a second bearing provided for rotatably supporting the first rotary piston about the first axis of rotation;
• wherein the second bearing is arranged on the outer surface of the first fixed axle body and inside the first rotary piston;
• and
• a first seal for sealing from the first and/or the second bearing to the pump room, arranged between the first fixed axle body and the first rotary piston inside the first rotary piston;
• wherein the first seal is a dynamic seal.

A rotary lobe pump for conveying a particle-laden conveyed liquid, comprising:

• a pump housing with a pump room;
• an inlet opening and an outlet opening;
• a first, multi-lobe rotary piston, which is arranged in the pump room and is rotatably mounted about a first axis of rotation;
• a second multi-lobe rotary piston, which is arranged in the pump room, and is rotatably mounted about a second axis of rotation spaced apart from the first axis of rotation and meshingly engages in the first rotary piston;
• wherein the first and the second rotary pistons are drivable in opposite directions and are designed to generate a flow of the conveyed liquid from the inlet opening through the pump room to the outlet opening by counter-rotation about the first and second axis of rotation, respectively;
• a first drive device arranged on one side of the pump housing which is mechanically coupled to the first rotary piston for driving the first rotary piston;
• a first fixed axle body, which is arranged inside the first rotary piston and connected to the pump housing on the side of the first drive device;
• and
• a seal arranged on the first fixed axle body inside the first rotary piston,
• at least one first bearing includes two bearings for rotatably supporting the first rotary piston about the first fixed axle body, wherein the two bearings are each arranged on an outer surface of the first fixed axle body and inside the first rotary piston, wherein one of the two bearings engages the seal;
• and
• a second drive device mechanically coupled to the second rotary piston for driving the second rotary piston.