Industrie Zanussi S.p.a.

Zanussi Elettrodomestici S.p.a.

Ugo Favret

Claudio Milocco

Gianni Santarossa

Sergio Tassotti

Antonio Martegani

Alessandro Cantu'

A dishwashing machine has a single motor pump unit, including a circulating centrifugal pump and a peripheral outflow drain pump mounted on a common shaft of a reversible drive motor to alternately deliver a washing fluid to and drain fluid from the dishwashing machine. The two pumps are connected by openings in their respective pump chambers communicating with an annular chamber between the two pumps. The annular chamber has a vent fluidly connecting the chamber with a washing water circuit of the dishwashing machine. Preferably the annular chamber has an impeller therein mounted on the drive shaft of the motor, forming a further centrifugal pump with the annular chamber.

Dishwashing machine with a single-motor pump unit

A dishwashing machine includes a recirculating pump having a casing, an inlet communicating with a sump of a washing tub, an outlet communicating with a spray arm located above the sump, and an impeller rotatable within the casing in a recirculating direction during a washing phase of operation of the machine and rotatable in a direction opposite to the recirculating direction during a drain phase of operation of the machine. A recirculating filter is positioned between the spray arm and the sump. To ensure that all water collected in the sump adjacent the inlet of the recirculating pump is discharged during the drain phase of operation of the machine, a conduit has a first end connected to the interior of the casing of the recirculating pump and a second end positioned adjacent the recirculating filter. A passage through the conduit has a cross section that is calibrated to achieve, upon the impeller of the recirculating pump rotating in the opposite direction thereof, discharge of water collected in the sump adjacent the inlet of the recirculating pump as a water jet from the second end of the passage. Such water jet passes through and cleans the recirculating filter and is directed toward the intake of a drain pump of the machine.

Washing machine including improved apparatus for cleaning a

A pump unit, particularly for use in a dishwasher, includes first and second pumps having respective impellers and a motor drive shaft fixed to the two impellers for alternately rotating the impellers in a first direction, during which only the first pump delivers a liquid, and an opposite second direction during which only the second pump delivers a liquid. The first pump is a peripheral outflow pump, and the second pump is a centrifugal pump the impeller of which includes blades oriented forwardly with respect to the second direction of rotation.

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Pordenone, Italy

Ugo Favret