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US 2006/0039810 A1Published application
Device for conveying a liquid
AssigneeMann+Hummel GmbH
InventorsLuc Reynders, Bert Kempeneers
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AssigneeMann+Hummel GmbH
InventorsLuc Reynders, Bert Kempeneers
Estimating the term…
A device for conveying a liquid, in particular a cutting liquid from a machining operation containing production residues. The device includes a vertical pump having a pump housing (14), a pump impeller (13), a drive shaft (19) surrounded by a housing (18), an electric motor, and a shaft connection between the electric motor and the pump impeller (13). The pump housing (14) has an inlet opening (15) and a liquid delivery opening (16). When the pump is started, a negative pressure is generated in the housing (18) surrounding the drive shaft (19). The zone of negative pressure extends into the pump housing (14) through a gap (22) between the shaft (19) and the housing (18) and thus assures that fluid will be drawn into the pump even when the liquid level is extremely low.
A device for conveying a liquid, said device comprising a vertical pump comprising a pump housing with an inlet opening and a liquid discharge opening, a pump impeller rotatably mounted in said pump housing, an electric motor for driving the pump impeller, and a drive shaft connected between the motor and the pump impeller, wherein the drive shaft is enclosed by a shaft housing, and above the pump impeller at least one gap in the shaft housing is provided for the drive shaft, and wherein, at least at the start of pumping, a negative pressure is generated in the shaft housing, said negative pressure extending through said gap into the pump housing to draw liquid through the inlet opening into the pump housing.
A device according to claim one, wherein the electric motor is connected to the drive shaft housing via a connecting flange.
Dependencies are inferred from the claim text.