Abstract: A filtering device, allowing to provide an effective filtering without either requiring particular efforts to the user or imposing him or her to operate in excessively hard positions, comprises a filtering element comprised between a first and a second supporting surface, the distance between the supporting surfaces being adjustable, so as to compress the filtering element by moving the supporting surfaces the nearer the other, and actuating device apt to modify the distance of the supporting surfaces. The actuating device is selectively connectable to a surface of the supporting surfaces in a such way that the actuating device can alternatively move unrelated to motion of the surfaces so as to be placed in an operative configuration or move integral to the surface so as to modify the distance between the surfaces in order to compress the filtering element.

Abstract: A whirlpool bathtub (1) comprises a plurality of units (2) for generating flows of water and/or air in the tub (1); each unit (2) comprising, attachable to a wall (1a) of the tub (1) with a through hole, at least: a flow generating chamber (3) with a water passage/feed opening (4), an impeller (5) for generating flows and a nozzle (6), delimiting the chamber (3), and designed to allow the directional outfeed of the flow towards the inside of the tub (1); impeller (5) drive means (7), connected to the impeller by a transmission shaft (8), and located on the outside of the wall (1a); means (9) for supplying air to the chamber (3) which are connected to the chamber (3) and designed to allow the air to be mixed with the water which can be carried into the chamber (3).

Abstract: A hydraulic pump with permanent-magnet motor having a preset direction of rotation, comprising a permanent-magnet motor connected to an impeller with curved vanes which is rotatably accommodated in a volute. The volute is predominantly symmetrical with respect to a line being directed toward an intake port and passing through a rotation axis of the impeller.

Abstract: A hydraulic pump with permanent-magnet motor having a preset direction of rotation, comprising a permanent-magnet motor connected to an impeller with curved vanes which is rotatably accommodated in a volute. The volute is predominantly symmetrical with respect to a line being directed toward an intake port and passing through a rotation axis of the impeller.

Abstract: The method and the corresponding device allow to start a synchronous motor with the chosen rotation direction, with a very high static torque, without requiring any modification of the structure of the synchronous motors currently in use, by means of an adapted electronic circuit managed by a microprocessor.

Abstract: A method for the starting and steady-state supply of a permanent-magnet synchronous motor, particularly for driving a centrifugal hydraulic pump. The method comprises three successive steps: a first learning step, a second starting step, and a third steady-state step. During the first step, the rotor is turned through two angles of 180 mechanical degrees in the same direction, storing the parameters of the rotor and particularly determining the initial current and the mechanical zero point of the rotor. During the second step, by generating with a power supply (inverter) a practically sinusoidal current waveform, the rotor is started with a higher current than the stating current and with a low frequency which gradually increases, waiting for the rotor at its transit through 80, 100, 260 and 280 mechanical degrees. Once the intended steady-state speed has been reached, a practically sinusoidal current is applied and the rotor is waited for at transit through the zero points.

Abstract: The pumping device comprises a pump driven by a motor having a stator and a permanent-magnet rotor located between polar expansions and connected to an impeller. A liquid suction duct and a liquid delivery duct are connected to the pump to define a hydraulic circuit. A reciprocating vacuum pump, for creating a negative pressure at the suction duct of the pump, has a resilient cylindrical element connected to a rigid cylindrical box-like element and defines therewith a chamber. The chamber has inlet and outlet valves connected to the hydraulic circuit through a poppet valve, and an arm-like member connected to the resilient element. An opposite end of the arm-like member supports a magnet located between poles of the stator of the motor, whereby to cause movement of the arm-like member and the resilient element for circulating fluid through the chamber via the inlet and outlet valves for priming the pump upon actuating the poppet valve.