Radial pump with static eccentric and rotatable cylinders

A pump for conveying a liquid with mixed gas, the pump comprising

• a hollow external housing;
• a rotatable annular, inwardly facing drive surface extending around and inside the housing;
• a generally static and tubular eccentric extending inside and axially through the annular surface and disposed eccentric to the axis of the annular surface;
• a displacer adapted for radial displacement and disposed between the rotatable annular surface and the static eccentric, the displacer being rotatable relative to the eccentric and being rotated by the rotatable annular, inwardly facing drive surface around the axis of the annular surface;
• the displacer is rotatively fixed relative to and rotates along with the annular surface, the displacer is rotatable with respect to the eccentric, and the annular surface is rotatable around and relative to the eccentric;
• a supply of liquid gas mixture to the pump, an outlet for pumped mixture from the pump;
• the supply of the mixture comprises a hollow shaft which is located in the housing for delivering the mixture to the displacer, and the shaft is rotatable and is connected with the annular surface for rotating together with the annular surface;
• the eccentric includes an axial opening communicating with the hollow shaft for receiving mixture flowing axially into the eccentric from the hollow shaft, and the axial opening of the eccentric communicating with the displacer for supplying mixture to the displacer;
• the displacer communicating with at least one of the supply and the outlet for the mixture, for selectively drawing the mixture from the supply into the displacer as the radial space between the eccentric and the annular surface increases and for pumping the mixture from the displacer through the outlet as the radial space between the eccentric and the annular surface decreases.