Abstract: A diaphragm pump intended to pump gases or highly-volatile liquids include a vibrating arm (6) acting on a diaphragm (5) placed into oscillation by a fixed electromagnet (7) fed with alternating or direct electric current. The vibrating arm (6) is composed of a single piece of plastic material, with an enlarged head (11) integrally molded with at least one permanent magnet (9) located opposite electromagnet (7). Opposite the head (11), the vibrating arm (6) has an elastically deformable part (12) attaching the arm to pump housing (1).

Abstract: A centrifugal pump, intended for pumping liquids, includes a impeller (1) connected in rotation to a rotor (7) with a permanent magnet that is part of a synchronous motor. The rotor (7) which has an axial clearance (L) is accommodated in a cylindrical housing (10) that is part of the body (9) of stator (8) of the motor. To orient the drive direction (F) of rotor (7) on the starting of the pump, complementary configurations are provided on the front face of rotor (7) away from impeller (1) and at the bottom of housing (10). These configurations comprise helicoidal surfaces (14, 16) connected at their ends by notches (15, 17).