US1666068A - Steam turbine - Google Patents
Steam turbine Download PDFInfo
- Publication number
- US1666068A US1666068A US198718A US19871827A US1666068A US 1666068 A US1666068 A US 1666068A US 198718 A US198718 A US 198718A US 19871827 A US19871827 A US 19871827A US 1666068 A US1666068 A US 1666068A
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- Prior art keywords
- stator
- supporting
- arm
- disk
- arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
- F01D1/02—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines
- F01D1/026—Impact turbines with buckets, i.e. impulse turbines, e.g. Pelton turbines
Definitions
- a steanrturbine characterized like the arm 17 extends outwardandissupf v by a stator-member 'p zovided with two opported by verticalstandardQetto Wli'l'Cli" it a 65 'l 1O 'positely-extending, axially arranged sup.- is seeured bya key '25'. i v
- FIG. 5 is an enlarged, broken, sectionalftO, as shown in Fig 3, providediwith beafi' View on tlie.lihe.'5f5 ofiEi'g. 4t;,.and' ings-housings andiLQ respectively; which e Eig, 6 isv a detached View in inside elevw n o enti-frlctlon I g whichyi n 5 40 tioii'ofthe lefth hd-diskof the stator-memmb r ng p n ii Ou er "periphery her. e I V i f of the supportingerms' and 23.
- stator-member comprisencloses a thrust-bearingptt which abuts at ing two complementary stator-disks-IO and one end against a shoulderefi-formeclon the 1 f V 4 11 respectively provided with outwardly-ex supporting-arm 23 aforesaidand at its outer j tending, annular flanges 12 and. 13 ,and s'e ,end is held thereon a collar 46, as 'clzirly Q cured together by anQannu1ar series of shown inFigB I bolts- 14.
- the.whip which is inheren't'to'the rotary-member ofturbines of prior type, minimized to such an extent as to be pract-ically eliminated, with the result that the turbine is more eflicient and longer-lived.
- Ar steam turbine having a stator-ineinber consisting of two stator-disks, each of which has a substantially fiat faceand 1S provided with an outwardlyextending supporting-arm; means for securing the said stator-disks together with the flat face of one dislr engaging the flat face of the other disk; standards connected to' each support- I ing arm for preventing the'rotation of the said statoi member; a hollow, cylindrical rotor-member enveloping the said statormember; and bearings interposedbetween each of the opposite side-walls of the said -stator-1nember and the said supportingarms.
- Asteam turbine having a stator-mem- 'ber consisting of two stator-disks, each of which is provided with .two oppositely-extending, axially-arranged supportingairms; an axial inlet-passage"formed in one of the said arms that extends therethrough; an axial exhaust-passage formed in the other of the said arms that extends therethrough, said in'let'and exhaust passagesha'ving indirectconnection with each other through the stator-member; stan'dardsc'onnected to each supporting-arm for preventing the rotation "of the said stator-member; a hollow, cylindrical rotor-member, enveloping the said stator-member; and bearings interposed between each of the oppositeside-walls of the inlet-passage formed in one of the said arms; an axial exhaust-passage formed in the other of the said arms; a nozzl-e-lirgture carried by the said stator-member; radial inlet-channels formed in the said statormember and connecting
- a steam turbine having a stator-forcenber consisting of two stator-disl-zs, each of which is provided with an outwardly-ex tending supporting-arn'i; an axial inlet-pas sage formed in one of the said arms; an'axial exhaust-passage formed iii-the other of the said arms; a nozzle-lixture carried by'the said stator-n'1einber'; radial inlet -channelsformed in the'inner face of one of the said stator-disks and connecting thesaid inletpassage withthe said nozzledixture; standards'connected to each supporting-arm for preventing the rotation of the said stator member; a hollow, cylindrical rotor-member enveloping the said stator-inei'nber; and bearings interposed between each of the opposite side-walls of the said stator-member and the said supporting-arms.
- a steam turbine having a stator-member provided with two oppositely-extending, axially-arranged supporting-arms; an axial inlet-passage formed in one of the said arms; an axial exhaust-passage formed in the other of the said arms; a nozzle-fixture carried by the said stator-member; radial.
- steam turbine having a stator-incur her provided with twooppositely-extending- 'axia lly arranged supportingarms; an axial inlet-passage formedin one of: the said arms, an axial exhaust-passage formed in the other otthe said arms; a twospa'rt nozzle ring car ri'ed by the said stator-member and-formed with two setsof oppositely directed nozzles 1'adial inletchannels formed in the said stator-member and connecting the sald inlet passage an'd the'nozzle-ring; standards connectedf to each snpporting-ar-mi for prevent- 1 ing theiotat-ion of the said"stator-member;
- a steam'turbine having a stator-mem-' ber provided with two oppositely-extending, axially-arranged supporting-arms; an axial .-inletpassage formed-in one ofthe said arms; an axial exhaushpassage formed in the other of the said arms; a nozzle-fixturecarried by the said stator-member; radial inlet-cl'iannels formed in thesaidstator-member and connectmg the sa d nlet-passage and the said.
- nozzle-fixture,standards connected to each supporting-arm for preventlng the rotation of the saidstator-member; a hollow, cylin drical rotor-member enveloping the said stator-member; bearings lnterpos-ed between each of the opposite side-walls of, the said stator-member and the saidv supporting arms; an exhaust-chamber formed in the said'stator-member and connected to the said exhaust-passage; and. transverse exhaustchannels extending from side to'side of the said stator-member and connected to the said 1 r exhaust-chamber;
- a steam turbine having a stator-mend ber consisting of two stator-d1sks, each of which is provided with an outwardly-extend ingsupporting-arm; standards connected'to each supporting-arm tor preventmg the rotation of the said stator-member; a nozzlering clamped between the said two statordisks; a hollow, cylindrical rotor-member envelopmg the said stator-member; and
- a steam turbine having a stator-member consisting of two stator-d1sks, one stator disk having a chamber in one face thereof and steam-channels extending outwardly therefrom, the other stator-disk forming a 'closure'for said chamber and channels, an outwardly-extending each ,stator-dlsk; and a standard connected supporting-aria for m each supporting-arm, which holds the stator-member against rotation.
- a steam turbine havng a stator-member consisting'of two stator-disks, one statordisk having a chamber in'one face thereof,
- each supporting-arm which holds the statorineinber against 1'()t2Lt101],l)Oi3l1 of said statordisks havlng exhaust-channels extending 'therethrough and connected with said ex haustrchamber, the supporting-arm preferablyo each stator-disk; "a, standard connected to ated with the stator diskhaving an exhaust chamber therein being provlded wlth an ex -Y haust passage therethrough that opens into said exhaust chamber.
- stator-menu ber consistin v of two stator-disks, an out- 'wardly-iextending sup 'iorting-arin for each I stator-disk, and a standard connected to each supporting-arm," which holds the stator member" against rotation, each stator-disk having a.chambertherein, the chamber in one stator-disk being'closed by the' other stator-disk and the-chamber in the latter stator-disk being closed by the supporting arm associated therewith.
- a steam turbine having a Stilt0 11'l1@111 ber consisting of two stator-disks, an out ber consisting oftwostator-disks secured".
- stator-disk a standard con nected to each supporting-arm, Wliichholds the stator-member agalnst rotation, and nozzle-rings betweensaid stator-disks;
- a steam turbine having a stator-meml ber consistingof two stator-disks secured together, an outwardly-extending supporting-arm for each stator-disk, astandard con,
- a steam turbine having a stator-member consisting of two stator-disks secured together, an outwardly extending supporting-ari'n for each stator-disk, a standard connected to each supporting-arm, which holds the stator-memberagainst rotation, nozzle rings between said stator disks, each nozzleo of the ring and of greater width adjacent to the stemn-chamber than at the outer ends thereof' I In testimony whereof, I. have signed this specification.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Description
April 17, 1928. 1,666,068
- A. w. BENNETT swam TURBINE 7 Filed June 14,- 1927 5 sneets sheet 1 I a 6 Y Qv Ir \l Q i I I I April 17, 1928. 1,666,068
- A.. w. BENNETT v 5 TEAM TURBI NE 4 Filed June 14, 1927 6 s Sheets-Sheet 2 '3 N A. w. BENNETT STEAM TURBINE I Filed June 14, 1927 5 Sheets-Shea! 3 m m &
atente i rgmigz g .v
I ALGNZO w. BENNET OFNEWHAVEN, Conner musk] f TURBiNEf T A l catio filed tune 14, 19271. fSeriaIY fi'O IBSQ'YI SQ 1 in; steamturbines and-has for its object the hand stator-disk: 10.. V production of a simple and efficient prime-l TheTight-hand"stator disk l1" oft'he Sta-i mover of the class described, constructed tor-mein'ber is also provided in its outer" 60 with particularreference t0 miniinizingfthe face with a'recess21 for thevrecepti on of the: so-ealled whip f the rotating membeiz large flange like head 22 of a righflhand- I \Vith this object in view, my invention. supporting-arm QSQYtheout'er endfofwhich, consists: in? a steanrturbine characterized like the arm 17 extends outwardandissupf v by a stator-member 'p zovided with two opported by verticalstandardQetto Wli'l'Cli" it a 65 'l 1O 'positely-extending, axially arranged sup.- is seeured bya key '25'. i v
portingrarins; s'tandardsconnectedgtol each The peripheries oi' thedisksand'11 are" 7 supporting-arm for preventing the rotatioirl'espectively formed withhaiinula'rgroovesfiti ot the latter; aho1l0w cylindrical rotorand 27 which intersect'their inner'faces as member envelopingthe said stator-member; clearly shown in Fig. Siandiwhich respec 70 I '15 bearings interposed between .eachof the. 01 tivelyreceiven ZZIeriBgs 28 alfitiQQ, which posite side-Walls, of the said stator-member are secured. 1- 1 1 24 by l le l i O b 1 and the said, supportingarms; and outlet Ther ng 98 and 29 just mentioned together and inlet and exhaust passages'foi-med term the noZzle-fixtui'ept the turbine. i f V one 01: bpth of. the said supIiortihg-arms; At three equidistant pointsjas indioatedf 7 5' Myinvention further consists in astiagagiij-v i 'ti' s; 4mm 6,"the nozzle rings28' a'nd'29i turbine characterised asaboveandliaving re cut 'away' 011 1 ?1 1" 'd v certain details. of. construction and combi steam-Ch m g' g b fi X 'j BSP nations of parts as willthe hereinafter-He lively intersectediby the outer end of o'nefof rti cularly r cit d, i th threecorresponding, .i'adial ste mgchmmgie s01 scribed. and pa v I I 32, the inner eiidsofWhich latter-intersect I This invention relates to -an .irn roYement thejhead 16 a'hdili'ence th'arnilito I Infthe accompanying drawings; i 7' f he i ged nner nd bf-an n t passage 33l I I Fig 1 1s anend-oview' of steam turbine, which exten lXlaliy thlimighthe support; I
constructed in accordance with my i IIVBIL- big-arm'lTand diskl'OIf Fr m eachofithe v o f ti c" v steam-chambers 31 the steam is pi'ojelcted 35 is aside.v iewthereotj f ug sr ps i Q Z ?P 5S? g Fig.3 is un enlarged' view thereof: in veri-t 3i and ,agan st' an annular" SBI'IBSV' of I t gal Central; longitudinal; section buckets 36 311C137 I'BSEGCtlVGlLYiWhlClI are l0 VI Fig. 4 i i f th t bihg i flgfi- 'cated on opposit'e'sides'ofthe nozzieffixture hand-endelevationwith the left-handistandr and projectlradially' inward from-the cylih- 3" ardtand the left side-wall or: the iOtor-hmm- :di'ical' rotor-ring 38 ofi'the rotor memheu betnemovedl; o 1 j I V whichalfso comprisestwosiderplatesfi jfiami Fig. 5 is an enlarged, broken, sectionalftO, as shown in Fig 3, providediwith beafi' View on tlie.lihe.'5f5 ofiEi'g. 4t;,.and' ings-housings andiLQ respectively; which e Eig, 6 isv a detached View in inside elevw n o enti-frlctlon I g whichyi n 5 40 tioii'ofthe lefth hd-diskof the stator-memmb r ng p n ii Ou er "periphery her. e I V i f of the supportingerms' and 23. In ad In carrying out ihivention es herein di'tio i to' the bearing 43, thel'iousingltQ also shown, I employ a stator-member compris encloses a thrust-bearingptt which abuts at ing two complementary stator-disks-IO and one end against a shoulderefi-formeclon the 1 f V 4 11 respectively provided with outwardly-ex supporting-arm 23 aforesaidand at its outer j tending, annular flanges 12 and. 13 ,and s'e ,end is held thereon a collar 46, as 'clzirly Q cured together by anQannu1ar series of shown inFigB I bolts- 14. a i "After escaping-from the:nozzlerpassages; v The. left-hand stator-disk .10 is fiormed; '34 andstriking the buckets l'iifi ltlie steam-is r10 with a recess 15: for; the. reception-0t the causedtoVreverse.its.dimetiem as is o mend 1 flange-like head 16 of an.-outwar-d1y-eXtendin, turbine eonstruetion,,; and impinges on ing; axially-arranged supporting-arml i, the i an annular series of. -'stationary: buckets' outerend of which;is-supported-by,a-standr which project. radially outward. from jthe lf v I ard 18 to. which latter it: is nonrotatably disk 10: of the stator-fixture and. is-againglle. r a securedby. means offaikey 1-9. An annu reversedfin linectionraii'di impinges. upon l L series, 20 pves terigidlyattaeh another series ofir-adi il b C Q'P -AShi' j tf' V 38cand sideplates 39 and it).
' After escaping into the left side of the left side of the interior of the rotoreme nber,
which, as before stated, comprises the ring hollow rotor-member, as just above describe'ch-the steam passes througha circular series of exhaust-channels 49 which pass through both of the disks and 11 from side to side, as shown in Fig. 3, and intersect an. exhaust-chamber 5O formed in the disk 11, from which it escapes outward through an exhaust-passage 51 formed in the interior ofthe supporting-arm 23; V 1
Similarly, the steam escaping from the nozzle-passages impinges upon the buckets 37 before mentioned, by which its direction is reversed against a stationary series of buckets 52"projecting outward from the stator-disk 11 and by them it is again reversed in direction against another annular, rotating series of buckets 53 projecting inward from the rotor-ring 38, and so on against alternating series of stationary and 'rotating buckets, and finally escaping out-- ward into the right-hand end of the hollow rotor-member, from' which it passes" through the righthand end oithe exhaustchannels l9 into the ei haust-chainber and ultimately out through the exhaust-passage 51 in thesupporting-arm23 aforesaid.
By constructing the turbine as above described, the.whip, which is inheren't'to'the rotary-member ofturbines of prior type, minimized to such an extent as to be pract-ically eliminated, with the result that the turbine is more eflicient and longer-lived.
I claim: a
1. Ar steam turbine, having a stator-ineinber consisting of two stator-disks, each of which has a substantially fiat faceand 1S provided with an outwardlyextending supporting-arm; means for securing the said stator-disks together with the flat face of one dislr engaging the flat face of the other disk; standards connected to' each support- I ing arm for preventing the'rotation of the said statoi member; a hollow, cylindrical rotor-member enveloping the said statormember; and bearings interposedbetween each of the opposite side-walls of the said -stator-1nember and the said supportingarms. I v
2. Asteam turbine, having a stator-mem- 'ber consisting of two stator-disks, each of which is provided with .two oppositely-extending, axially-arranged supportingairms; an axial inlet-passage"formed in one of the said arms that extends therethrough; an axial exhaust-passage formed in the other of the said arms that extends therethrough, said in'let'and exhaust passagesha'ving indirectconnection with each other through the stator-member; stan'dardsc'onnected to each supporting-arm for preventing the rotation "of the said stator-member; a hollow, cylindrical rotor-member, enveloping the said stator-member; and bearings interposed between each of the oppositeside-walls of the inlet-passage formed in one of the said arms; an axial exhaust-passage formed in the other of the said arms; a nozzl-e-lirgture carried by the said stator-member; radial inlet-channels formed in the said statormember and connecting the said-inlet-pas sage and the said nozzle-fixture; staiuilards connected to each SLlPlJOl'tlllg-itllll for preventing the rotation of the said stator-member; a hollow, cylindrical rotor-member enveloping the said stator-member; and bear ings interposed between each of the opposite sidewalls of the said stator-member and the said supporting-arms.
4. A steam turbine, having a stator-nieinber consisting of two stator-disl-zs, each of which is provided with an outwardly-ex tending supporting-arn'i; an axial inlet-pas sage formed in one of the said arms; an'axial exhaust-passage formed iii-the other of the said arms; a nozzle-lixture carried by'the said stator-n'1einber'; radial inlet -channelsformed in the'inner face of one of the said stator-disks and connecting thesaid inletpassage withthe said nozzledixture; standards'connected to each supporting-arm for preventing the rotation of the said stator member; a hollow, cylindrical rotor-member enveloping the said stator-inei'nber; and bearings interposed between each of the opposite side-walls of the said stator-member and the said supporting-arms.
5. A steam turbine, having a stator-member provided with two oppositely-extending, axially-arranged supporting-arms; an axial inlet-passage formed in one of the said arms; an axial exhaust-passage formed in the other of the said arms; a nozzle-fixture carried by the said stator-member; radial. inlet-channels formed in the said statorunember and connecting the said inlet-passage and the said, nozzle-fixture; standardsconnected to each supporting-arm for preventing the rotation of the said stator-member; a hollow, cylin drical rotor-member en eloping the said stator-member; bearings interposed between each of the opposite side walls ofthe saidv statoraneniber and the said supportingarms; and exhaust-channels formed in the said stator-men'iber and connectin the said exhaust-passage with the interior of the said hollow rotor-member.
6. steam turbine, having a stator-incur her provided with twooppositely-extending- 'axia lly arranged supportingarms; an axial inlet-passage formedin one of: the said arms, an axial exhaust-passage formed in the other otthe said arms; a twospa'rt nozzle ring car ri'ed by the said stator-member and-formed with two setsof oppositely directed nozzles 1'adial inletchannels formed in the said stator-member and connecting the sald inlet passage an'd the'nozzle-ring; standards connectedf to each snpporting-ar-mi for prevent- 1 ing theiotat-ion of the said"stator-member;
' hollow, cylindrical rotor-member enveloping the said stator-member;.-and bearings interposedbetw'een each of the opposite-sidewalls ofthe-sald stator-member and the said supporting-arms.
7 A steam'turbine, havinga stator-mem-' ber provided with two oppositely-extending, axially-arranged supporting-arms; an axial .-inletpassage formed-in one ofthe said arms; an axial exhaushpassage formed in the other of the said arms; a nozzle-fixturecarried by the said stator-member; radial inlet-cl'iannels formed in thesaidstator-member and connectmg the sa d nlet-passage and the said.
nozzle-fixture,standards connected to each supporting-arm for preventlng the rotation of the saidstator-member; a hollow, cylin drical rotor-member enveloping the said stator-member; bearings lnterpos-ed between each of the opposite side-walls of, the said stator-member and the saidv supporting arms; an exhaust-chamber formed in the said'stator-member and connected to the said exhaust-passage; and. transverse exhaustchannels extending from side to'side of the said stator-member and connected to the said 1 r exhaust-chamber;
8. A steam turbine, having a stator-mend ber consisting of two stator-d1sks, each of which is provided with an outwardly-extend ingsupporting-arm; standards connected'to each supporting-arm tor preventmg the rotation of the said stator-member; a nozzlering clamped between the said two statordisks; a hollow, cylindrical rotor-member envelopmg the said stator-member; and
'bearings interposed between'each of the opposite side-walls of the said stator-member andthe saidsupporting arms.
9. A steam turbine having a stator-member consisting of two stator-d1sks, one stator disk having a chamber in one face thereof and steam-channels extending outwardly therefrom, the other stator-disk forming a 'closure'for said chamber and channels, an outwardly-extending each ,stator-dlsk; and a standard connected supporting-aria for m each supporting-arm, which holds the stator-member against rotation. 10. A steam turbine havng a stator-member consisting'of two stator-disks, one statordisk having a chamber in'one face thereof,
-steam channels extending outwardly therefrom, and aninlet passage therethrough that t-ern inat-es 'at the said chamber; an outward; ly-extendin'g supportlng arm' for each state disk, the supporting-arm associated ,with'i the said chamberedZstatorfdisk:having an'i "inlet passage that forms 7 an extensionot, the '1 a let passage in the stator-disk.
Y teai "ur me 134V. as r-iie 1+3 Y l1 As nt l1 l 1ng tato 1 n ber consisting of two 'stator-disks onestator disk having a chamber :in one 'ffdCG' thereof" and steam-channels extending;outwardly I therefrom, the other stator-disk forming a:
closure for said chamber.andchannels when engaged with the first stator-disk and having-l an exhaust chan'iber therein an outwardly,- extending supporting-arnia associated with;
each supporting-arm, which holds the statorineinber against 1'()t2Lt101],l)Oi3l1 of said statordisks havlng exhaust-channels extending 'therethrough and connected with said ex haustrchamber, the supporting-arm associeo each stator-disk; "a, standard connected to ated with the stator diskhaving an exhaust chamber therein being provlded wlth an ex -Y haust passage therethrough that opens into said exhaust chamber. p
12. Astea ntnrbme havlng a stator-menu ber, consistin v of two stator-disks, an out- 'wardly-iextending sup 'iorting-arin for each I stator-disk, and a standard connected to each supporting-arm," which holds the stator member" against rotation, each stator-disk having a.chambertherein, the chamber in one stator-disk being'closed by the' other stator-disk and the-chamber in the latter stator-disk being closed by the supporting arm associated therewith.
13. A steam turbine having a Stilt0 11'l1@111 ber consisting of two stator-disks, an out ber consisting oftwostator-disks secured".
together, an outwardly-extending support-,-
ing-arm for each stator-disk,"a standard con nected to each supporting-arm, Wliichholds the stator-member agalnst rotation, and nozzle-rings betweensaid stator-disks;
15. A steam turbine havinga stator-meml ber consistingof two stator-disks secured together, an outwardly-extending supporting-arm for each stator-disk, astandard con,
nected to each supporting-arm, which holds thev statormember against rotation, and
nozzle-rings between said stator-disks, each nozzle-ring being cut away' attheir adjoiningfaces, which combine-to form steamchambers, when the nozzle-rings are dSSQlD-{ bled. I v t 16. Alsteamturbme having a stator-mom ber consisting ofitwo' stator-disks secured 3.
together, an outwardly-extending supporting-arm for each stator-disk, a standard connected to each supporting-arm, which holds when the nozzle-rings are assembled, and
nozzlepassages leading from said steam chambers to the outer edge of the nozzlellllgs. I
17. A steam turbine having a stator-member consisting of two stator-disks secured together, an outwardly extending supporting-ari'n for each stator-disk, a standard connected to each supporting-arm, which holds the stator-memberagainst rotation, nozzle rings between said stator disks, each nozzleo of the ring and of greater width adjacent to the stemn-chamber than at the outer ends thereof' I In testimony whereof, I. have signed this specification. v
ALONZO W. BENNETT,
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US198718A US1666068A (en) | 1927-06-14 | 1927-06-14 | Steam turbine |
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US198718A US1666068A (en) | 1927-06-14 | 1927-06-14 | Steam turbine |
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US1666068A true US1666068A (en) | 1928-04-17 |
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US198718A Expired - Lifetime US1666068A (en) | 1927-06-14 | 1927-06-14 | Steam turbine |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2355177A1 (en) * | 1975-06-17 | 1978-01-13 | Bradbury Inventions Pty Ltd | Multi-stage axial flow turbine - has stator blades at 45 degrees in opposition to blades on rotor |
-
1927
- 1927-06-14 US US198718A patent/US1666068A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2355177A1 (en) * | 1975-06-17 | 1978-01-13 | Bradbury Inventions Pty Ltd | Multi-stage axial flow turbine - has stator blades at 45 degrees in opposition to blades on rotor |
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