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OwnerJury V. Aroshidze, Ibragim A. Kadi-Ogly +4inventors
InventorsJury V. Aroshidze, Ibragim A. Kadi-Ogly, Vladimir P. Chernyavsky, Aron B. Shapiro, Boris I. Fomin, Anatoly F. Yankov
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A device for collecting the liquid cooling medium of an electric machine rotor winding which comprises an external cylindrical member having an annular recess on its internal surface fastened to the rotor in communication with the cooling medium discharge from the rotor winding, and a stationary internal cylindrical member having an external surface provided with an annular projection, extending into the annular recess of the external cylindrical member, both members being arranged concentrically with a rotor shaft. The annular projection is provided with at least one internal annular cavity open on the circumference of the projection and communicating with the liquid collecting chamber.
A device for collecting discharged cooling liquid from axial outlet passages of a rotor winding of an electric machine, having means for supplying a cooling liquid to the rotor winding, said supply means being connected by axial inlet passages with said winding, and means for discharging the cooling liquid into a drain cavity, said discharge means being in communication with axial outlet passages of said winding, said discharge means comprising an outer cylindrical member having an annular recess on the inner surface thereof attached to the rotor and mounted concentrically with the rotor shaft, a stationary inner cylindrical member mounted in concentric relation with the rotor shaft, said inner cylindrical member having on its outer surface an annular projection engaging the annular recess of said outer cylindrical member and having at least one inner annular cavity open at the outer diameter of the annular projection, and a drain cavity provided in said inner cylindrical member and communicating with the inner annular cavity.
Dependencies are inferred from the claim text.
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For machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil: with provision for replenishing the cooling…
Dynamo-electric machines
Term ended 18 Oct 1999 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to electric machine engineering, and more particularly, to devices for liquid cooling of electric machine rotor winding.
The device for liquid cooling can be advantageously used in turbo-generators with a self-pumping system of rotor winding liquid cooling.
Known in the prior art are devices for liquid cooling of rotor winding, using forced liquid supply, where a liquid flow is forced through the hollow conductors of the winding by a pump.
FIG. 1 is a longitudinal section of a device for liquid cooling of an electric machine rotor winding, according to the invention;
FIG. 2 is a longitudinal section of an embodiment of a device for liquid cooling having two internal annular cavities in the annular projection of the internal cylindrical member;
FIG. 3 is an enlarged longitudinal section of an embodiment of a means for discharging the cooling liquid, according to the invention;
Referring now to the drawings, FIG. 1 shows a device for liquid cooling of an electric machine rotor winding, comprising a means 1 for supplying a cooling liquid into a winding 2 of a rotor 3, a liquid collecting chamber 4, and a means 5 for discharging the cooling liquid into the liquid collecting chamber 4. The means 1 for supplying the cooling liquid includes insulated metallic pipes 6 interconnecting water-conducting axial channels (not shown) in a shaft 7 of the rotor 3 with lead-outs (not shown) of the winding 2 of the rotor 3 through holes 8 in a ring 9. Furthermore, the ring 9 is provided with holes 10 for draining the cooling liquid into the means 5 for discharging the cooling liquid. Fastened to the shaft 7 of the rotor 3 is a ring member 11 retaining the metallic pipes 6 against displacement under the action of centrifugal forces.
The cooling liquid discharging means 5 is of the following construction. The rotor 3 carries an external cylindrical member 12 fastened thereto and arranged concentrically with its shaft 7. The cylindrical member 12 is provided with an annular recess 13 on the internal surface thereof facing the shaft 7. The annular recess 13 accommodates an annular projection 14 of a stationary internal cylindrical member 15 also arranged concentrically with the shaft 7 of the rotor 3 and provided with axial channels 16 passing throughout the circumference thereof. In the annular projection 14 an internal annular cavity 17 of a constant width is formed, open on the circumference of the projection 14 and communicating with the liquid collecting chamber 4 via the axial channels 16. A cavity 18 in the clearance between the external cylindrical member 12 and the internal cylindrical member 15 behind the annular projection 14 is separated from the interior of the stator (not shown) by labyrinth packings 19.
In another embodiment of a device for liquid cooling of an electric machine rotor winding, the annular projection 14 (FIG. 2) of the stationary internal cylindrical member 15 is provided with two internal annular cavities 17 open on the circumference of the projection 14, both annular cavities 17 being interconnected and connected with the liquid collecting chamber 4 via the axial channels 16.