Grundfos Holding A/s

Christian Blad

Thomas Blad

Peter Mønster

Erik Baasch SØRENSEN

A centrifugal pump assembly includes an electric drive motor (), a driven impeller () and a pump casing () which surrounds the impeller (). A movable element (') is arranged a valve element. A section of the valve element is movable from a released position into a bearing position, fixed on a contact surface (), by pressure which is produced by the impeller in the pump casing. A control device () moves the valve element from one switching position into another switching position and reduces the speed of the drive motor. Upon pressure in the pump casing dropping such that the valve element is no longer fixed on the contact surface and the valve element has been moved into the other switching position, the control device increases the speed of the drive motor again. A method for moving a valve element is provided.

Centrifugal pump unit and method for moving a valve element in a pump unit

A centrifugal pump assembly includes an electrical drive motor (), with at least one impeller () which is driven by the motor and a pump casing () which surrounds the impeller () and which includes at least one suction connection () and at least two delivery connections (). A rotatable valve element (&#x2033;) is arranged in the pump casing (). The valve element is movable between at least two switching positions, in which the flow paths through the delivery connections () are opened to a different extent. The valve element (&#x2033;) includes an annular wall () which surrounds the impeller () and in which at least one switching opening () is formed. The valve element (&#x2033;) is rotatably mounted about a rotation axis (X), which is centric to the annular wall (), inside of the pump casing ().

Centrifugal pump assembly

A circulation pump assembly includes a first inlet (), an outlet (), an electric drive motor () and at least one impeller () driven by the drive motor (). The circulation pump assembly has at least one first flow path () positioned in a connection between the first inlet () and the outlet () for increasing the pressure of a fluid. The circulation pump assembly has a second inlet (). The at least one impeller () has at least one second flow path () for increasing the pressure of a fluid, which is positioned in a connection of the second inlet () to the outlet (). A heating system is provided having a circulation pump assembly of this type.

Circulation pump assembly

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 hydraulic system includes a circulation pump assembly () provided with a speed controller (), a hydraulic circuit (A, B) connected to the circulation pump assembly () as well as a mechanical switch device (&#x2033;) which is subjected to pressure from a fluid in the hydraulic circuit (A, B) and which can be moved into at least two different switch positions. The mechanical switch device () can be moved by the circulation pump assembly () by way of a hydraulic coupling via the fluid. The speed controller is configured to initiate a movement of the switch device (&#x2033;) by way of at least one hydraulic force acting thereon and causing a movement of the switch device (&#x2033;), produced via the hydraulic circuit, via a speed adaptation of the circulation pump assembly.

Hydraulic system

A hydraulic system includes at least one circulation pump assembly () provided with a speed controller (), at least one hydraulic circuit (A, B) connected to the circulation pump assembly () as well as at least one mechanical switch device () which is mechanically subjected to pressure by a fluid in the hydraulic circuit (A, B) and which can be moved into at least two different switch positions. The mechanical switch device () moves by the circulation pump assembly () hydraulic coupling via the fluid. The speed controller is configured to initiate a movement of the switch device (), by at least one hydraulic force acting upon the switch device () and causing a movement of the switch device () via the hydraulic circuit, via a speed adaptation of the circulation pump assembly ().

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Aalborg, Denmark

Christian Blad