Device for conveying a liquid

Details Device for conveying a liquid Device for conveying a liquid

2007-01-23

2007-01-23

Stashick, Anthony (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C417S423300

Reexamination Certificate

active

11195606

ABSTRACT:
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.

REFERENCES:
patent: 2391769 (1945-12-01), Campbell
patent: 44 32 224 (1996-03-01), None
patent: 1 307 170 (1973-02-01), None
patent: 01 032095 (1989-02-01), None
patent: 08 144989 (1996-06-01), None

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