US1031757A - Reentrant turbine. - Google Patents

Description

G. WESTINGHOUSE. REENTBANT TURBINE,

APPLICATION FILED PEB.26, 190-9 1 @31,?5?@ Batented July 9, 1912.

3 SHEBTB-SHEET 1.

WITNESSES: 4 INVENTOR.

TTORNEY INFACT.

G WESTINGHOUSE. REENTBANT TURBINE;

APPLICATION FILED I'EBJM; 1909.

Patented July 9;, 1912.

3 SHEETS-SHEET 2.

INVENTOR.

WITNESSES RNEYJ FACT.

G. WESTINGHOUSE. BEENTBANT TURBINE.

APPLICATION FILED 53.26, 1909.

1 75? Eatented July 9, 1912.

3 SHEETS-SHEET 3.

2x15 Vi! 20 133 Q A m TORNEYIN FACT.

UNITED STATES PATENT OFFICE.

GEORGE WESTINGHOUSE, OF PITTSBURGH, PENNSYLVANIA.

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To all whom it may concern:

Be it known that I, Gnoncr: .Wns'rmc- House, a citizen of the United States, and a turbines of the reentrant type.

resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, havev made a new and useful Invention In Reentrant Turbines, of which the following, is,

fication and illustrated in the drawings ac-'- companying and forming a part of this ap plicati-on.

' In the drawings; Figure 1 is a longitudinal sectional view of a-turbine embodying this invention; Fig. 2 is a view in end elevation of said turbine; Fig. 3 is a development in section of the lower half of the turbine showing the arrangement of nozzles and blades; and, Fig. a detail View in section of the ndz'zles and blades and the portions adjacent thereto. I v

As is now common in reentrant turbines,

' the rotor consists of a single wheel 5 mountedupon a shaft 6 mounted in bearings (not shown) and passes through suitable packing glands 7 within a casing 8, which casing surrounds the wheel and is provided with an inlet 9 and exhaust 10.

formed in one casting bolt half, as at 11, and the lower half is prefer-- The casing is preferably I divided on its horizontal axis for the purpose of removing the rotor and for accessibility in machining.

The upper-halfof the casin is preferably to the lower ably formed at 12. The rotor carries-a single 'row of blades 13,

in two parts bolted together preferably of the impulse type and preferably drop-forged,so that a shrouding 14 is formed as part of the blade' lforgings. The

blades may be assembled inthe rotor in any desired manner but are preferably provided with cylindrical base portions 15 secured within holes drilled for their rece tion in the periphery of the rotor-.1 The si e of the rotor or wheel just within'the' row of blades Specification of Letters Patent- Application filed February 26, 1908. Serial No.480,226.

Patented July 9, 1912.

is of reduced section and accurately niachined, as at 16. Lying within close proximity to the reduced portion 16 of the rotor and on each side thereoffis a segmental nozzle-containing member 17, 17, provided on its inner face, or that one which lies next adjacent the side ofthe blade.

shrouds and the reduced portion of the rotor,

with grooves 18 adaptedgto entrain leakage steam and thereby serve as a packlng system. The sectional nozzle members 17 17 are yieldingly held; toward the sides of, the

shroud and the faces of the wheel so as to provide the minimum clearances between the groovedfaces of the nozzle members and the wheel. Each halffof the lower-half of the casing is machined-so as to form a flange 19 which coiiperates with a flange 20 formed on a block 21 secured toythe casmg by means of bolts'22to form a r cessed portion 23 within which aflanged member lies.' The waist 25 of the nozzle member fits snugly between the flanges 19 and 20'and is movable between said flanges toward and from the wheel. When the turortionj-24 of v the nozzle bine is assembled the distance 26 will be exactly the same as the distance between the inside of flanges 19 and 20 and the faces of the wheel. If collision occurs from any cause the nozzle member will move, away and undue heating will be then avoided. It will be seen therefore that the minim in clearance may be maintained? The no le members are yieldingly forced toward the wheel by steam pressure acting on their several faces and the members are limited in. their inward movement by the flanges 24 which abut against the flanges 19 and 20.

,The nozzle members are preferably formed in sections joined together by means of members 27 which serve as packings between the several sections. The nozzle member 17 is provided with nozzles 28, 29, 30, 31-and 32 for the first, third, fifth, seventh and ninth stages of expansion while the nozzle member 17 is provided with nozzles 3 3, 34:, 35, 36 and 37 for the second, fourth, sixth, eighth and tenth stages of expansion.

Nozzle 28, which is the primaryinlet nozzle,

connects with the inlet ;9 through a movable oonnecting throat r'nember' 38, which is provided in. order that the area of the nozzle member 17 actedjupon by the inlet pressure, will be reduced to the area of the nozzle-28. In order togdo this a; block 39 ls pressed into the inl'ii. and the movable i the interior of the-casing to minimize ,the

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throat 3 is yieldingly forced toward and in contact with the nozzle member 17"by means of a spring 40 inserted between the provided to prevent leaka e of steam around he nozzle. members outer end of the throat member 38 and a shoulder on the block 39. Packing 41 is the throat-member 38. T

- 17 and 17" are grooved, as at 41", to receive packing blocks 42,rwhi ch snugly fit within the grooves and are pressed by means oi springs43 toward the casing. These springs agef from one,'series of nozzles to the next.

The lower half of the casing is provided with chambers 29", 30, 31, and 32 as well as 33, 34, 35', 36 and 37", which serve as collecting and supply chambers for the sev-. eral expansion stages.

If desired the blocks 21 may be formed integrally with the casing castings, for by forming thelower half In two sections the same may be accurately machined.

The interior of the casing, that is, that part lying within the inner groove 1 8 1n the p the stages of expansion so that a predeterv face of the nozzle members, may elther be bled to a pressure equalizing theexhaust pressure which may be condenser or atmospheric; or, if desired, this space may .con-

nect with the'collecting chamber for one of mined pressure will be maintained within leakage.

In accordance with the provisions of the patent statutes, 1 have described the principle of operation of my invention, together vmeans.

with-the apparatus which I now consider to 40 I represent the -best embodiment thereof, but I. desire to have it understood that the app'aratus shown is only illustrative and that the invention can be carried out by. other What I claim is: 1. In a turbine, a bladed rotor element, a fluid discharging device movable axially of the turbine toward and from said element,

and a stop on the turbine stator for limiting the movement toward said element.

2. In a, turbine, a; bladed rotor element, a fluid discharging device movable lo'ngi tudinally of the turbine and yieldingly held toward said element, andmeanslimiting the 5.

movement of said device ment. .c v

3. In a turbine, a running wheel provided with a single row of blades, a casing surrounding said wheel, loosely mounted fluld 9 discharging devices located on opposlte toward said elesides of sald wheel and 'forming withaid I wheel, rentrant stages, and stops for limi 7 ing the movement of said devices toward sald wheel.

L-Jman elastic fluid turbine, a rotor ele ment, fluid discharging devices forming in-' conjunction with said element, reentrant stages and radially extending packing devices located between said stages.

In testimony whereof, I have hereunto subscribed my name this 16th day of February, 1909. s

cno. WESTINGHOUSE.

WitnessesL CHARLES W. McGnnn, JNO; S. GUNN. a

copies otthis'patent may be obtained for five cents each, by addressing the Commissioner of I'atenti,

- s V waahington, D. 0 '5 Y

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