Canned pump with dry rotor compartment

Details Canned pump with dry rotor compartment Canned pump with dry rotor compartment

2000-02-01

2001-09-25

Thorpe, Timothy S. (Department: 2834)

Pumps

Motor driven

Pump fluid communicates with sealed chamber containing armature

C417S366000, C417S423110, C417S369000, C417S371000

Reexamination Certificate

active

06293769

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to an electric feed pump having a stator disposed in the path of flow of a liquid feed and a rotor isolated from the liquid feed path.
BACKGROUND AND PRIOR ART
Such feed pumps are used, for example, for pumping cooling water. These pumps are classified as wet-rotor motors in which the rotors are in contact with the pumped liquid and a distinction is made between stator windings which are in contact with the pumped liquid (wet stator windings) and those which are not (dry stator windings). A wet stator winding can operate at high current levels because it is cooled by the pumped liquid.
It has been found, however, that if the rotor is contacted with the pumped liquid, large losses due to liquid turbulence are produced.
German patent DE 43 04 149 C1 discloses a liquid feed pump in which a rotor compartment and a stator compartment are hermetically sealed from a cooling compartment through which liquid is flowing. As a result the bearings of the rotor in the rotor compartment are not adequately lubricated
SUMMARY OF THE INVENTION
An object of the invention is to provide means by which this inadequate lubrication is avoided.
This object is achieved by disposing the rotor in a rotor compartment isolated from the liquid flow and containing a gas and providing the rotor compartment with a vent orifice connected to the ambient atmosphere. By this arrangement the electric feed pump can be operated at high efficiency in motor vehicles to pump a cooling liquid.


REFERENCES:
patent: 2261915 (1941-11-01), Korte et al.
patent: 2887062 (1959-05-01), Cametti
patent: 3836291 (1974-09-01), Bottcher et al.
patent: 4465437 (1984-08-01), Jensen et al.
patent: 4878804 (1989-11-01), Akerman et al.
patent: 4990068 (1991-02-01), Zhong et al.
patent: 5401146 (1995-03-01), Moriya et al.
patent: 5785013 (1998-07-01), Sinn et al.
patent: 8607609 (1986-08-01), None
patent: 4121430 (1992-11-01), None
patent: 4304149 (1994-09-01), None
patent: 29613050 (1996-10-01), None
patent: 3702028 (1997-04-01), None

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