Patent ID: 7413415

Claim:
A reciprocating electromagnetic micro-pump, particularly for small electrical appliances, comprising a hollow body defining a cavity and having a water inlet fitting, an electrical excitation winding surrounding said hollow body, a core of ferromagnetic material movable in reciprocating fashion in said cavity and co-operating with said electrical excitation winding, a tubular element defining a pumping chamber, an outlet fitting, and a one-way delivery valve connecting said a pumping chamber to said outlet fitting, a tubular piston with associated intake valve, extending from one end of said core, said tubular piston being sealingly slidable within said pumping chamber, and the tubular element being axially movable, against the action of a compression spring, between an advanced position of normal operation of the pump and a retracted position in which said outlet fitting is placed in communication with said cavity of the pump in turn communicating with said inlet fitting, for the absorption of any overpressures.