VOLUMETRIC PUMP, IN PARTICULAR A PISTON OR A SCREW WITH EXCELLENT MOTION COMPRISING A RIGOROUS SEALING DEVICE

摘要

The present invention relates to a volumetric pump (1) for the pumping of a gaseous or liquid fluid, in particular to the piston / to an eccentric movement, comprising a main body (2), a fluid inlet to be pumped, an output of the pumped fluid, the pumping means comprising at least one input shaft (5) associated with a device converting a rotation movement in the circular translation movement actuates a piston or a screw with an eccentric movement (6), and a sealing device (10) is strictly between an internal medium (11) of the lubricating fluid and an external medium (12) of the fluid to be pumped, the sealing device (10) is strictly comprising a first ball upstream (100) comprising an inner ring (110) and an outer sleeve (120) linked to the pump body (2), a second ball joint downstream (200) comprising an inner ring (210) and an outer ring (220) connected to the piston / screw (6), and a sleeve in the longitudinal deformable (300) covering the outer rings (120, 220) of the ball joints (100, 200), while allowing a longitudinal sliding of said inner rings (110, 210) of said ball joints (100, 200), the sleeve (300) ensuring a strict sealing between the internal medium (11) and the external medium (12).