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US 6,273,684 B1Granted
Centrifugal pump unit
AssigneeGrundfos A/S
InventorsNiels Due Jensen, Carsten Nórgaard, Jórgen Schmidt
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AssigneeGrundfos A/S
InventorsNiels Due Jensen, Carsten Nórgaard, Jórgen Schmidt
Estimating the term…
The centrifugal pump unit includes a flow switch arranged within the pump housing in the flow path of a delivery fluid, which essentially consists of an electromagnetic switch device and a two-armed, pivotably mounted lever whose one arm projects into the flow path and whose other arm carries a magnet which is in contact-free active connection with the switch device. The switch device is arranged within a terminal box mounted on the unit housing. The lever is seated within a switch housing which is incorporated in a cartridge-like manner into the pump housing and which is hermetically sealed to the outside and which is arranged neighbouring the terminal box that such it is only in magnetic active connection so that the reed contact located in the terminal box is controlled by the magnet located in the switch housing. In this manner a usual terminal box may be used which does not need to be sealed with respect to the delivery flow.
A centrifugal pump unit comprising a flow switch arranged within the pump housing in the flow path of the delivery fluid and having of an electromagnetic switch device and a two-armed, pivotably mounted lever whose one arm projects into the flow path and whose other arm carries a magnet which is in contact-free active connection with the switch device, wherein the switch device is arranged within a terminal box mounted on the unit housing, wherein at least the part of the lever carrying the magnet is surrounded by a switch housing which is hermetically sealed to the outside and which is separated from the terminal box and is arranged neighboring this.
Dependencies are inferred from the claim text.