US3504207A - Rotor cooling means for water-cooled turbogenerators - Google Patents

Rotor cooling means for water-cooled turbogenerators Download PDF

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Publication number
US3504207A
US3504207A US831692A US3504207DA US3504207A US 3504207 A US3504207 A US 3504207A US 831692 A US831692 A US 831692A US 3504207D A US3504207D A US 3504207DA US 3504207 A US3504207 A US 3504207A
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US
United States
Prior art keywords
rotor
ring
sleeve
water
tubes
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Expired - Lifetime
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US831692A
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English (en)
Inventor
Ove Tjernstrom
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ABB Norden Holding AB
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ASEA AB
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/22—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors consisting of hollow conductors

Definitions

  • a rotor cooling system for a water-cooled turbogenerator has a plurality of cooling channels arranged in the conductor of the rotor winding and a plurality of metal coolant tubes connected to the coil ends of the winding. These coolant tubes have parts extending radially inward into an annular metallic distribution vessel arranged axially outside the coil ends. Individual electrically insulating intermediate sleeves form a connection between the coolant tubes and the distribution vessel.
  • the present invention relates to a rotor cooling system for water-cooled turbogenerators, which system comprises a plurality of cooling channels arranged in the conductor of the rotor winding and a plurality of metal coolant tubes connected to the coil ends of the rotor winding, the coolant tubes forming by means of their individual electrically insulating intermediate members a hydraulic connection between the coil ends and an annular distribution vessel of metal arranged axially outside the coil ends.
  • a cooling system which, in certain respects, resembles the object of the application is known from German Patent No. 1,014,215. According to that patent glass bodies are melted around the ends of individual cooling tubes at their insertion point into the annular distribution chamber, and thus operate as electrical insulators. The glass melting causes considerable complications in the manufacture and, furthermore, it is questionable whether the risk of cracks occurring in the glass when subjected to temperature variations is impermissibly high.
  • a construction according to the invention presupposes the use of so-called selfsealing jointing rings.
  • sealings rings in which the required deformation for scaling is efiected by certain parts of the ring surface being subjected to direct contact with the pressure medium.
  • centrifugal forces operate perpendicularly to the centre line of the ring, the centrifugal forces operating on the ring in the direction of the component. In a construction according to the invention, this is avoided since the centre line of all the sealing rings is directed radially in relation to the rotor shaft.
  • a rotor cooling means is characterised in that said insulating intermediate member consists of a sleeve directed radially in relation to the rotor shaft, one end of which is inserted in the distribution vessel and the other end of which surrounds the end of the coolant tube at a certain distance from the distribution vessel, each end of the sleeve being provided with a number of annular grooves each containing a selfsealing jointing ring of elastic material, said distribution vessel being arranged at an annular end surface of the rotor core and said sleeve being retained between said end surface and a fixing means arranged outside this end surface.
  • FIGURE 1 partly in axial section, partly in partial radial view, shows a turborotor provided with a cooling system according to the invention
  • FIG- URE 2 shows in axial section a detail of the means shown in FIGURE 1.
  • FIGURE 3 shows a partial cross section along the line AA in FIGURE 1.
  • FIG. 1 designates the rotor core and 2 the center line of a rotor of radial slot type intended for a turbogenerator.
  • the line 3 indicates the bottom of a winding slot.
  • the coil ends of the rotor Winding are designated 4, the retaining ring 5 and the end ring 6.
  • the rotor winding is directly cooled by means of thinwalled cooling tubes 7a embedded in the conductors and interconnected to communicate with each other in conventional manner.
  • the system of communicating cooling tubes is, at the'rotor end shown in the figure, directly connected to a plurality of coolant inlet tubes 7 and at the other end to similar'coolant outlet tubes.
  • the coolant inlet tubes 7 are led from the coil ends 4 through axial channels in an annular-support member 8 of insulating material surrounding the rotor body.
  • the coolant tubes are bent at right angles and directed radially inwards along the end surface of the rotor core'being electrically insulated from the rotor iron and each other and held by means of an annular support means arranged at the flank surface of the rootr body and having radial slots, said support means containing a metallic pressure .ring 9 which is pressed axially inwards with the help of bolts which are indicated in the drawings by the center lines 21 and 22.
  • the ends of the coolant inlet tubes are connected to a distribution chamber 10 formed by an annular, metallic distribution vessel 11, the radially outer wall of which is provided with radially directed recesses for hydraulic connections with the coil ends 4.
  • the distribution vessel 11 is attached to an annular end surface 30 of the rotor core by means of stop surfaces 12 and 13 and also with the help of the pressure ring 9 which with its outer edge abuts the end ring 6.
  • the radially inner wall of the distribution ring is provided with recesses for a number of feeding tubes 24 which are in communication with a centrally arranged axial inlet channel for cooling liquid 26.
  • the rotor body is designed with a removable part 23.
  • the end of the rotor not shown in the drawings is constructed in the same way as the end shown in FIGURE 1, with the difference that the part corresponding to the annular distribution vessel 11 is connected to the outlet channel 29 instead of the inlet channel 216.
  • a water-tight connection between the coolant tubes 7 and the distribution ring 11 is effected with the help of self-sealing elastic jointing rings 14 and 15.
  • the ends of the coolant tubes are not inserted completely into the distribution ring, but instead the cooling liquid is led through an electrically insulating sleeve 16 across a gap between the end 28 of the coolant tube and the distribution ring.
  • the sleeve 1'6 is provided with a tightly surrounding hose 17 of very elastic insulating material, which also surrounds an adjacent part of the cooling water tube 7.
  • the sleeve 16 is inserted in a radial recess in the distribution vessel recess in the distribution vessel and sealed to the walls of the recess by means of the elastic sealing rings 15 which permit the sleeve 16 to move in radial direction in relation to the rotor shaft.
  • the radial freedom of movement is limited, however, since the sleeve 16 and the insulating hose 17 are surrounded by a support sleeve 18 which is porting sleeve which comprises two halves arranged toin two parts, divided by a cut 31 in its longitudinal direction and shaped a stop surface 19 to take up centrifugal forces operating on the sleeve 16.
  • the support sleeve 18 is arranged in a radial channel 27 which is symmetrical in relation to the contact surface 20 between the pressure ring 9 and the rotor part 23.
  • the support sleeve is securied against centrifugal forces since its end abuts contact surfaces in the channel 27.
  • the end of the cooling water tube 7 is inserted into the radially outer end of the sleeve 16 and surrounded by the self-sealing elastic jointing rings 14.
  • Rotor cooling system for water-cooled turbogenerators which comprises a plurality of cooling channels arranged in the conductor of the rotor winding and a plurality of metal coolant tubes connected to the coil ends of the rotor winding and including parts extending radially inward, an annular metallic distribution vessel arranged axially outside, the coil ends, individual electrically insulating intermediate members forming a hydraulic connection between the coil ends and the annular distribution vessel, said insulating intermediate members each comprising a sleeve directed radially in relation to the rotor shaft, one end of which is inserted in the distribution yessel and the other end of which surrounds the end of a radial coolant tube part at a distance from the distribution vessel, each end of the sleeve being provided with at least one annular groove, said grooves each containing a self-sealing jointing ring of elastic material, said distribution vessel being arranged at an end'surface of the rotor core and a fixing means arranged outside said end surface, said s
  • said fixing means comprises a fixing ring and means to press the fixing ring against the end surface of the rotor core, and in which members forming channels for radial tube parts are arranged substantially so that they are halved by planes through adjacent contact surfaces between the support ring and the rotor core, each channel having a radially outer part which tightly surrounds a radially directed tube part surrounded by insulating material and a wider, radially inner part which also surrounds said sleeve.
  • Cooling system in which a flexible, insulating hose surrounds said sleeve and a part of the tube which lies immediately radially outside the sleeve.
  • Cooling system in which a supgether. and divided symmetrically to a plane perpendicular to the rotor shaft surrounds said insulating base.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
US831692A 1968-06-17 1969-06-09 Rotor cooling means for water-cooled turbogenerators Expired - Lifetime US3504207A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE08143/68A SE332223B (is") 1968-06-17 1968-06-17

Publications (1)

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US3504207A true US3504207A (en) 1970-03-31

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US (1) US3504207A (is")
CH (1) CH493956A (is")
DE (1) DE1930508B2 (is")
SE (1) SE332223B (is")

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569752A (en) * 1968-08-21 1971-03-09 English Electric Co Ltd Liquid-cooled dynamoelectric machine rotor
US3814959A (en) * 1971-06-23 1974-06-04 Alsthom Cgee Cooling arrangement for rotary electric machines
US3868520A (en) * 1974-01-18 1975-02-25 Westinghouse Electric Corp Turbine-generator water-cooled rotor shaft liner restraint
US3878413A (en) * 1973-02-23 1975-04-15 Asea Ab Turbo-generator, the rotor of which has a direct liquid-cooled winding
US3962594A (en) * 1973-12-28 1976-06-08 Boris Leonidovich Konovalov Rotor winding of electric machines
US4149100A (en) * 1974-02-01 1979-04-10 Siemens Aktiengesellschaft Excitation winding arrangement for a synchronous electric machine having a rotor with salient poles
US4350908A (en) * 1980-12-04 1982-09-21 Westinghouse Electric Corp. Cooling system for rotor of a dynamoelectric machine
EP0035071B1 (de) * 1980-03-03 1985-02-06 BBC Aktiengesellschaft Brown, Boveri & Cie. Flexible, elektrisch isolierende Rohrverbindung
US5859482A (en) * 1997-02-14 1999-01-12 General Electric Company Liquid cooled electric motor frame
US20080197724A1 (en) * 2007-02-16 2008-08-21 Rolls-Royce Plc Cooling arrangement of an electrical machine
US11876418B2 (en) 2018-09-27 2024-01-16 Siemens Energy Global GmbH & Co. KG Blocking element for rotor winding heads on turbogenerators with rotor cap with radial ventilation bores

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950403A (en) * 1956-09-04 1960-08-23 Vickers Electrical Co Ltd Electrical turbo generators
US3034003A (en) * 1958-10-11 1962-05-08 Seidner Mihaly Liquid cooled rotors for turbo-alternators
US3131321A (en) * 1962-04-23 1964-04-28 Gen Electric Liquid-cooled rotor for a dynamoelectric machine
US3296470A (en) * 1964-02-03 1967-01-03 Vsesouzny Nii Elecktromekhanik Liquid cooling of generator rotor windings
US3340412A (en) * 1964-08-28 1967-09-05 Bbc Brown Boveri & Cie Arrangement for the direct liquid cooling of a turbogenerator provided with end turnretaining rings

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950403A (en) * 1956-09-04 1960-08-23 Vickers Electrical Co Ltd Electrical turbo generators
US3034003A (en) * 1958-10-11 1962-05-08 Seidner Mihaly Liquid cooled rotors for turbo-alternators
US3131321A (en) * 1962-04-23 1964-04-28 Gen Electric Liquid-cooled rotor for a dynamoelectric machine
US3296470A (en) * 1964-02-03 1967-01-03 Vsesouzny Nii Elecktromekhanik Liquid cooling of generator rotor windings
US3340412A (en) * 1964-08-28 1967-09-05 Bbc Brown Boveri & Cie Arrangement for the direct liquid cooling of a turbogenerator provided with end turnretaining rings

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569752A (en) * 1968-08-21 1971-03-09 English Electric Co Ltd Liquid-cooled dynamoelectric machine rotor
US3814959A (en) * 1971-06-23 1974-06-04 Alsthom Cgee Cooling arrangement for rotary electric machines
US3878413A (en) * 1973-02-23 1975-04-15 Asea Ab Turbo-generator, the rotor of which has a direct liquid-cooled winding
US3962594A (en) * 1973-12-28 1976-06-08 Boris Leonidovich Konovalov Rotor winding of electric machines
US3868520A (en) * 1974-01-18 1975-02-25 Westinghouse Electric Corp Turbine-generator water-cooled rotor shaft liner restraint
US4149100A (en) * 1974-02-01 1979-04-10 Siemens Aktiengesellschaft Excitation winding arrangement for a synchronous electric machine having a rotor with salient poles
EP0035071B1 (de) * 1980-03-03 1985-02-06 BBC Aktiengesellschaft Brown, Boveri & Cie. Flexible, elektrisch isolierende Rohrverbindung
US4350908A (en) * 1980-12-04 1982-09-21 Westinghouse Electric Corp. Cooling system for rotor of a dynamoelectric machine
US5859482A (en) * 1997-02-14 1999-01-12 General Electric Company Liquid cooled electric motor frame
US20080197724A1 (en) * 2007-02-16 2008-08-21 Rolls-Royce Plc Cooling arrangement of an electrical machine
US8487500B2 (en) * 2007-02-16 2013-07-16 Rolls-Royce Plc Cooling arrangement of an electrical machine
US11876418B2 (en) 2018-09-27 2024-01-16 Siemens Energy Global GmbH & Co. KG Blocking element for rotor winding heads on turbogenerators with rotor cap with radial ventilation bores

Also Published As

Publication number Publication date
SE332223B (is") 1971-02-01
DE1930508A1 (de) 1970-08-27
DE1930508B2 (de) 1971-12-02
CH493956A (de) 1970-07-15

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