1. A rotary displacement pump containing! a casing (2) in which there is a pump chamber (4) and a radial inlet (20) for the fluid and an outlet (21) for the specified pump chamber (4); ! an external gear wheel (13) with a plurality (16) of internal teeth located in said pump chamber (4) and forming a squirrel cage shape with two end plates (14, 15), which are connected by longitudinal rods that form the specified set of internal teeth, indicated the outer gear (13) is at least partially disassembled; ! rotation means (11, 12), allowing the specified external gear wheel (13) to rotate inside the specified pump chamber (4) around the first axis (A13), and containing at least one bearing (11, 12) located centrally in the end a plate (14, 15) of said external gear wheel (13); ! an inner gear (9) located inside said outer gear (13) and made with a plurality of (9D) outer teeth meshed with said plural (16) of inner teeth of the outer gear (13); moreover, the specified internal gear wheel (9), rotating around the second axis (A8), parallel and at a distance from the specified first axis (A13), and the specified set (9D) of external teeth contains the number of teeth less than one than the number of teeth of many internal teeth the specified external gear wheel (13); and! an engine (3) for driving said internal gear (9) around said second axis (A8),! wherein said pump chamber (4) contains a removable wall (10), which is adapted to be attached to said casing (2) to close �
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