US3652880A - Arrangement for supplying rotor of an electrical machine with a liquid coolant - Google Patents

Arrangement for supplying rotor of an electrical machine with a liquid coolant Download PDF

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Publication number
US3652880A
US3652880A US93708A US3652880DA US3652880A US 3652880 A US3652880 A US 3652880A US 93708 A US93708 A US 93708A US 3652880D A US3652880D A US 3652880DA US 3652880 A US3652880 A US 3652880A
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US
United States
Prior art keywords
rotor
coolant
ring
annular
tubular structure
Prior art date
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Expired - Lifetime
Application number
US93708A
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English (en)
Inventor
Mihailo Starcevic
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BBC Brown Boveri AG Germany
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Bbc Brown Boveri & Cie
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Publication date
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium

Definitions

  • the present invention relates to an improved method for feeding a liquid into at least one liquidchannel connected with a rotor and rotating'with the latter, a liquid feed for carrying out the method, and an application of the latter.
  • the packing joints are under an internal pressure which is substantially above the outside pressure, this internal pressure being composed of the delivery feed pressure of the circulation pump, the dynamic pressure, and the action of the centrifugal force on the liquid at the packing joint.
  • This results either in an increase of the water losses (particularly in noncontract packings) or at least in an increase of the friction losses.
  • the water transmission point on a relatively small diameter on the shaft end, since both shaft ends are occupied, for example, so that the transmitter with a relatively large diameter must be placed on the'shaft.
  • slip ring packings this results in additional difficulties regarding wear, elimination of heat and manufacturing accuracy, particularly if the packing must consist of several parts for reasons of assembly.
  • a design without a contact packing would result in intolerable cooling water losses, because of the above-mentioned higher pressure.
  • the object of this invention is to provide a method and a liquid feed which do not have these disadvantages and which are nevertheless simple to manufacture and inexpensive to operate.
  • the method according to the invention is characterized in that the liquid is discharged at a point which is farther outside, seen radially, than the point where it is fed, and that the course of the liquid guide channel is so selected that the liquid contained therein is conveyed through the liquid guide channel during the rotation of the rotor, due to the centrifugal force acting on it. Since the pressure necessary for circulating the liquid is produced in the rotor itself, the liquid at the transition point from the stationary to the rotating part is not additionally under the delivery pressure of a circulation pump, as in the known arrangements.
  • the invention also provides a novel liquid feed for carrying out the method of the invention which is characterized in that it has a stationary feed part provided with at least one feed channeland one discharge channel, which is so arranged and designed with regard to the rotor provided with at least one liquid guide channel that a liquid flowing through the liquid guide channel is discharged through the discharge channel at a point of the rotor which is farther outside as seen radially than is fed through the feed channel.
  • the feed part can be provided at least one radially extending ring part which protrudes packingly into at least one annular groove in the rotor for feeding and discharging the liquid conveyed through a liquid channel in the rotor. It is also expedient to provide between the ring part and the annular groove radially extending non-contact packing slots which can be closed by sealing means when the rotor stands still.
  • the invention furthermore provides an application of the method according to the invention for cooling a rotor winding of an electric machine consisting of tubular conductors.
  • FIG. I shows by way of example, a first embodiment of a liquid feed according to the invention with two ring parts arranged side-by-side in an axial direction;
  • FIG. 2 shows by way of example a second embodiment of a liquid feed according to the invention with two superposed ring parts arranged in radial direction;
  • FIG. 3 shows by way of example a third embodiment of a liquid feed according to the invention with one ring part
  • FIG. 4 shows by way of example a fourth embodiment of a liquid feed according to the invention with a set-ofi ring part
  • FIG. 5 shows by way of example a fifth embodiment of a liquid feed according to the invention with an axially extending packing slot.
  • the cooling liquid feed represented there has a stationary feed part 3 provided with feed and discharge channels 1, 2,'which is so arranged and designed with regard to rotor 5 provided with liquid guide channels 4 that the cooling liquid flowing through the liquid guide channels 4 is. discharged through discharge channel 2 at a point of rotor 5 which is farther outside, seen radially, than the point at which the liquid is fed through feed channel I.
  • the feed part 3 is provided with two ring parts 6 and 7 arranged side-by-side in axial direction and extending radially over a different distance, ring part 6 which extends farther outside being being provided with radical through-bores 6d for discharging the cooling liquid issuing from the liquid.
  • guide channels 4 into the discharge channel 2 and the other ring part 7 located further radially inward than ring 6 being provided with radial through-bores 7d for feeding the cooling liquid into the liquid guide channels 4 from feed channel 1. Due to this arrangement the cooling liquid issuing from ring part 7 is forced during the rotation of rotor 5 to the outside in the radially extending guide channel part 8 rotating with the latter, due to the centrifugal force acting on it, and thus into the liquid guide channel 4.
  • the liquid guide channels 4 are extended in the tubular conductors of a rotor winding of an electric machine to be cooled.
  • the radially extending packing slots 9, 10, 11 and 12 have the further advantage that, due to the centrifugal force acting in the packing slots on the cooling liquid contained therein, issuance of the cooling liquid to the outside is prevented. Since there is no centrifugal force acting during the standstill of the rotor, a device can be provided which closes the packing slots mechanically under these conditions.
  • the two ring parts 6, 7 can be arranged for axial displacement on a holding part 13 which is provided with the feed and discharge channels 1, 2. Between the ring parts 6, 7 and the holder 13 are arranged two Orings 14,15 and 16, 17 each for mutual packing. The ring parts 6, 7 are guided in axial direction in annular grooves l8, 19 of rotor 5 located transverse to and concentric with the rotor axis.
  • FIG. 2 shows by way of example a second embodiment of a liquid feed according to the invention with two ring parts 6, 7
  • FIG. 3 shows a third embodiment of a liquid feed according to the invention with a single ring part consisting of two halves 22 and 23 provided with bores 6d, 7d, the parts corresponding to the embodiment in FIG. 1 being provided with the same reference numbers.
  • FIG. 4 shows a fourth embodiment of a liquid feed according to the invention with a single ring 25 provided with one part 25a with through-bores 6d(which corresponds in function to ring 6 of FIG. 1) accommodated in annular groove 18, and another part 25b of lesser diameter than part 25a with through-bores 7d (which corresponds in function to ring 7 of FIG. 1) accommodated in annular groove 19-; the remaining parts corresponding to the embodiment represented in FIG. 1 being provided with the same reference numbers.
  • the ring part 250 extending farther outside i.e., in the radial direction is designed to discharge the cooling liquid issuing from the liquid guide channels 4 which enters groove 18, and the other ring part 25b the periphery of which is located further inward toward the axis of the rotor than is the periphery of ring part 2511 for feeding the cooling liquid from feed channel 1 into annular groove 19 and thence through guide channel 8 into-; the liquid channels 4.
  • the wall surface 26 of groove 18 must be designed as a bearing surface.
  • sealing rings which seal the packing slots 27, 28 between the sides of the ring parts 25a, 25b and the adjacent side walls of grooves 18 and 19 during standstill of rotor 5.
  • FIG. 5 shows another embodiment of a liquid feed according to the invention with axially extending packing slots.
  • This liquid feed has a stationary feed part 3 provided with a feedand discharge channel 1, 2 which is so arranged and designed with regard to rotor 5 provided with cooling liquid guide channels 4 that a cooling liquid flowing through the liquid guide channels 4 (rotor winding) is discharged through discharge channel 2 and collecting chamber 29 at a point of rotor 5 that is farther outside, seen in radial direction, than is fed through collecting chamber 30 and feed channel 1.
  • the inlets and outlets 31, 32 of the liquid channels 4 are separated from each other by a labyrinth packing 33 since a slight leakage between these two points is without significance.
  • a labyrinth packing 33 For sealing the two axially extending slots between the stationary feed part 3 and rotor 5 are provided two carbon ring packings 34, 35 which are pressed by an annular spring each in radial direction against a cylindrical packing surface of rotor 5.
  • the cooling liquid fed over collecting chamber 30, feed channel 1 and inlet 31 to the rotor winding is forced radially outward during the rotation of rotor 5 in the radially extending liquid guide channel part 8 rotating with the latter, due to the action of the centrifugal force, andthus into the axially extending liquid guide channel 4.
  • said ring and annular groove serving to provide a first annular chamber into which the coolant is fed from said feed channel and thence into said tubular structure on the rotor, and a second annular chamber into which the coolant is returned from said tubular structure on the rotor and thence into said discharge channel, said second annular chamber being located further radially outward from the rotor axis than said first annular chamber thereby to effect circulation of the coolant through said tubular structure on said rotor by virtue of centrifugal forces imparted to the coolant as a result of rotor rotation.
  • first stationary ring component seated in said first annular groove and which is provided with a bore for passing the coolant outwardly therethrough from said feed channel into said first annular groove
  • a second stationary ring component seated in said second annular groove and which is provided with a bore for passing the coolant inwardly therethrough from said second annular groove into said discharge channel, said second annular groove being located further radially outward from the rotor axis than said first annular groove thereby to effect circulation of the coolant through the tubular structure on said rotor by virtue of centrifugal forces imparted to the coolant as a result of rotor rotation.
  • a ring constituted by a pair of annular ring halves seated in said annular groove in face-to-face contact
  • annular slots provided in said rotor, said annular slots being concentric with the rotor axis and extending laterally from the opposite side walls of said annular groove at a radial distance from the rotor axis which is less than the radial distance from said rotor axis to the annular space established between the adjacent peripheries of said annular ring halves and the bottom wall of said annular groove,

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
US93708A 1969-12-04 1970-11-30 Arrangement for supplying rotor of an electrical machine with a liquid coolant Expired - Lifetime US3652880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1806269A CH512851A (de) 1969-12-04 1969-12-04 Verfahren zur Zuführung einer Flüssigkeit in einen Rotor, Flüssigkeitszuführeinrichtung zur Durchführung des Verfahrens und Anwendung des Verfahrens

Publications (1)

Publication Number Publication Date
US3652880A true US3652880A (en) 1972-03-28

Family

ID=4430151

Family Applications (1)

Application Number Title Priority Date Filing Date
US93708A Expired - Lifetime US3652880A (en) 1969-12-04 1970-11-30 Arrangement for supplying rotor of an electrical machine with a liquid coolant

Country Status (5)

Country Link
US (1) US3652880A (OSRAM)
CH (1) CH512851A (OSRAM)
DE (1) DE2010403C3 (OSRAM)
FR (1) FR2072766A5 (OSRAM)
NO (1) NO130613C (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4220881A (en) * 1978-04-28 1980-09-02 Ramsey Controls, Inc. Dual, three phase, inverter-driven motor
US4350908A (en) * 1980-12-04 1982-09-21 Westinghouse Electric Corp. Cooling system for rotor of a dynamoelectric machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471071A1 (fr) * 1979-12-03 1981-06-12 Aroshidze Jury Dispositif destine a refroidir par un liquide l'enroulement rotorique d'une machine electrique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543062A (en) * 1967-08-10 1970-11-24 Giuseppe Banchieri Direct wire cooling in synchronous electrical machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543062A (en) * 1967-08-10 1970-11-24 Giuseppe Banchieri Direct wire cooling in synchronous electrical machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4220881A (en) * 1978-04-28 1980-09-02 Ramsey Controls, Inc. Dual, three phase, inverter-driven motor
US4350908A (en) * 1980-12-04 1982-09-21 Westinghouse Electric Corp. Cooling system for rotor of a dynamoelectric machine

Also Published As

Publication number Publication date
DE2010403B2 (de) 1979-09-27
NO130613B (OSRAM) 1974-09-30
CH512851A (de) 1971-09-15
NO130613C (OSRAM) 1975-01-08
FR2072766A5 (OSRAM) 1971-09-24
DE2010403A1 (de) 1971-06-09
DE2010403C3 (de) 1980-06-04

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