Magnet pump with bi-directional axial self-alignment

A magnet pump with bi-directional axial self-alignment comprising:

• a cylindrical inner chamber (12) provided with an axially extending suction duct (13) and a delivery duct (14) that extends along a circumference of the chamber;
• an impeller (25), located inside the chamber (12) and having a front portion (26) facing the suction duct (13), a rear portion (27) facing in an opposite direction to the suction duct, and a central support portion (28);
• a cup-shaped driving rotor (31) located outside the chamber (12) and having at least a driving magnet (34), and a driven magnet (35), which is incorporated in impeller (25) and faces on and forms a magnetic coupling together with the driving magnet (34);
• a supporting spindle (17) that extends axially in chamber (12) and that supports the impeller (25) in a rotatably and axially movable manner;
• and front (18) and rear (24) thrust-bearings bushings located on the spindle (17), proximate to the front portion (26) and the rear portion (27) of impeller (25), such that the impeller (25) is kept in stable axial and rotational equilibrium and its axial position on the spindle is maintained, controlled and self-aligned in both a front and a rear pump directions by means of a linear magnetic coupling between the impeller (25) and the chamber (12) in which the impeller is positioned, wherein the magnetic coupling is formed by means of two magnets (41, 42) incorporated respectively in the wall of chamber (12) and the central portion (28) of the impeller (25), the magnets (41, 42) being mutually aligned and arranged such that opposite poles of the magnets are adjacent to one another (North-South and South-North), so as to form a close magnetic circuit.