A centrifugal pump assembly includes an electrical drive motor (4, 6), an impeller (14) which is driven by the drive motor and a pump casing (12) surrounds the impeller and including two branches (27, 32, 34). A movable valve element (18) is arranged in the pump casing and is movable between two switching positions, in which the flow paths through the two branches (27, 32, 34) are opened to a different extent. The valve element (18) is configured and arranged in the pump casing (12) such that it separates a suction chamber (24) which is connected to a suction side of the impeller (14) from a delivery chamber (26) which is in connection with the delivery side of the impeller (14). The valve element (18) is mechanically and/or hydraulically coupled to the drive motor (4, 6) for at least a movement between the two switching positions.

A pump chamber (32a), valve chambers (33a and 33b), discharge holes (33e and 33f), and flow paths (34 and 35) are integrally provided to each other in a housing (30), so that the pressure loss of the cleaning liquid “W” can be reduced. In addition, since valve chambers of the flow paths extend to the discharge holes, the cleaning liquid flowing out of the flow paths can be discharged at a portion closer to the central of the valve chambers. As a result, the outlet portions of the flow paths and the inlet portions of the discharge holes is brought closer to each other, and the turbulent of the cleaning liquid in the valve chambers can be suppressed, thereby reducing the pressure loss.

A pump assembly is disclosed comprising a pump body having a first pump stage housed in the pump body including a fluid inlet and a first and a second fluid outlet. A flow feed chamber is housed in the pump body in fluid communication with the second fluid outlet. A second pump stage housed in the pump body is in fluid communication with the flow feed chamber and includes at least one fluid outlet connected to the second pump stage. A valve assembly is operable into a first position to fluidically connect the fluid inlet through the first pump stage to the first fluid outlet. The valve assembly is further operable into a second position to fluidically connect the first pump stage to the second fluid outlet and the flow feed chamber and the flow feed chamber fluidically connected to the at least one fluid outlet through the second pump stage.

A washer pump configured to suck liquid stored in a tank and configured to jet the liquid to a surface to be cleaned. The washer pump includes: a housing attached to the tank, an impeller rotatably provided in the housing, a motor rotating the impeller, a motor accommodating portion provided in the housing and accommodating the motor, a corner portion provided in the housing and disposed between the motor accommodating portion and the tank, and a respiratory hole provided between the motor accommodating portion and the corner portion. The respiratory hole communicating an inside of the motor accommodating portion with an outside thereof.

Since the pump chamber (32a), the valve chambers (33a and 33b), the discharge holes (33e and 33f), and the flow paths (34 and 35) are integrally provided to each other in the housing (30), in the case where these are formed of separate members, a step or the like that inhibits the flow of the cleaning liquid “W” is not formed in the flow path of the cleaning liquid “W”, so that the pressure loss of the cleaning liquid “W” can be reduced. In addition, since the valve chambers (33a and 33b) of the flow paths (34 and 35) extend to the discharge holes (33e and 33f), the cleaning liquid “W” flowing out of the flow paths (34 and 35) can be discharged at a portion closer to the central of the valve chambers (33a and 33b). As a result, the outlet portions of the flow paths (34 and 35) and the inlet portions of the discharge holes (33e and 33f) is brought closer to each other, and the turbulent of the cleaning liquid “W” in the valve chambers (33a and 33b) can be suppressed, thereby reducing the pressure loss.

A centrifugal pump assembly includes an electrical drive motor (2), with at least one impeller (18) which is driven by the motor and a pump casing (6) which surrounds the impeller (18) and which includes at least one suction connection (20) and at least two delivery connections (22, 24). A rotatable valve element (30, 30′, 30″) is arranged in the pump casing (6). The valve element is movable between at least two switching positions, in which the flow paths through the delivery connections (22, 24) are opened to a different extent. The valve element (30, 30′, 30″) includes an annular wall (32) which surrounds the impeller (18) and in which at least one switching opening (48) is formed. The valve element (30, 30′, 30″) is rotatably mounted about a rotation axis (X), which is centric to the annular wall (32), inside of the pump casing (6).

A pump includes: a pump housing having an inflow port, a first discharge port, and a second discharge port; a pump motor for providing a rotational force; and an impeller disposed in the pump housing and configured to pump water introduced through the inflow port. A planetary gear train includes a carrier connected to a rotary shaft of the pump motor, a sun gear connected to the impeller, a pinion gear rotatably installed in the carrier and engaged with the sun gear, and a ring gear engaged with the pinion gear. A rotatable valve disc is couple with the ring gear in the pump housing, and configured to close the first discharge port and open the second discharge port in a first rotation position, and open the first discharge port and close the second discharge port in a second rotation position.

A conveying device with an electric drive, having a housing with a suction opening and a plurality of outlet openings that comprises a conveying element which is rotatably received in the housing to produce a fluid flow from the suction opening to the respective outlet opening, wherein the outlet openings are mounted to the housing at least axially spaced from each other.

A hydraulic construction unit includes a centrifugal pump assembly which includes an electrical drive motor and at least one impeller which is driven by the electric drive motor. At least one valve element is arranged such that the valve element is movable by way of a fluid flow which is created by the impeller. At least one section of a wall delimits a flow path in the hydraulic construction unit and is configured to be movable as a moveable section. The movable section of the wall is part of the valve element or is connected to the valve element for movement. The movable section is movable so as to be at least partly effected by friction forces of a fluid flow which runs along the wall.

A pump assembly includes an electric drive motor (4, 6), an impeller, driven by the drive motor (4, 6), and a valve device (18) situated in a flow path through the pump assembly, which is movable between a first and a second switching position. The valve device (18) is coupled to the drive motor via a first coupling such that a movement of the drive motor (4, 6) is transmitted onto the valve device (18) and the valve device is movable from the first into the second switching position by rotation movement of the drive motor. The first coupling is releasable by way of increasing the speed of the drive motor (4, 6) and/or increasing the pressure at the outlet side of the impeller and/or by way of slip, such that the coupling between the drive motor (4, 6) and the valve device (18) is reduced or lifted.