Pump assembly and hydraulic system

A hydraulic system comprising:

• at least two hydraulic circuits;
• and
• a pump assembly comprising:
• an inlet channel;
• an electrical drive motor driveable in two rotation directions;
• at least one impeller connected, for rotation, to the electrical drive motor;
• a drive element subjected to flow produced by the at least one impeller;
• and
• at least one valve situated in an inlet of the pump assembly and the at least one valve comprises a valve element which is movable between at least two switch positions and, for movement thereof is connected to the drive element, the at least two switch positions comprising a first switch position and a second switch position, wherein the valve element is configured to move from the second switch position in a flow direction through the inlet channel to the first switch position to close the inlet channel of the pump assembly in the first switch position, wherein the at least one valve is configured as a switch-over valve, by way of which the flow path for a fluid delivered by the pump assembly can be switched between the at least one two hydraulic circuits, wherein the valve element is linearly movable in a longitudinal direction of the valve element between the at least two switch positions based on a pivoting movement of the drive element, the drive element comprising an onflow surface which is situated in an outlet channel of a pump casing surrounding the at least one impeller, wherein the onflow surface is formed by a flap which is pivotable about a pivot axis, and the flap is coupled to the valve element for movement thereof, wherein at least one sealing surface of the valve element, or one of a first valve seat and a second valve seat, on which the valve element comes to bear or both at least one sealing surface and the one of the first valve seat and the second valve seat, are configured such that the valve element can move further by a certain amount in a movement direction after contact on the one of the first valve seat and the second valve seat.

A pump assembly comprising:

• an electrical drive motor driveable in two rotation directions;
• an impeller connected, for rotation, to the electrical drive motor;
• a drive structure, at least a portion of the drive structure being subjected to flow produced by the impeller;
• a pump casing surrounding at least a portion of the impeller, the pump casing comprising an outlet channel;
• and
• a valve situated in an inlet of the pump assembly and the valve comprises a valve element which is movable between at least two switch positions and, for movement thereof is connected to the drive structure, wherein the valve element, in at least a first switch position of the at least two switch positions, closes an inlet channel of the pump assembly and the valve element is arranged such that a movement direction into the first switch position corresponds to a flow direction through the inlet channel, the drive structure comprising a flap portion and a lever portion, the flap portion being pivotable about a pivotable axis, the flap portion comprising an onflow surface arranged in the outlet channel, the lever portion being in contact with the valve element for movement thereof, wherein the valve element is configured to be linearly movable along a longitudinal axis of the valve element between the at least two switch positions based on pivoting movement of the drive structure, wherein at least one sealing surface of the valve element, or one of a first valve seat and a second valve seat, on which the valve element comes to bear or both at least one sealing surface and the one of the first valve seat and the second valve seat, are configured such that the valve element is movable further by a certain amount in the movement direction after contact on the one of the first valve seat and the second valve seat and the flap portion is configured to move based on the certain amount of movement of the valve element in the movement direction after the valve element contacts the one of the first valve seat and the second valve seat.