US1697174A - Steam-turbine stage - Google Patents

Steam-turbine stage Download PDF

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Publication number
US1697174A
US1697174A US731475A US73147524A US1697174A US 1697174 A US1697174 A US 1697174A US 731475 A US731475 A US 731475A US 73147524 A US73147524 A US 73147524A US 1697174 A US1697174 A US 1697174A
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United States
Prior art keywords
nozzle
nozzles
steam
group
turbine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US731475A
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English (en)
Inventor
Forner Georg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
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Publication of US1697174A publication Critical patent/US1697174A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/047—Nozzle boxes

Definitions

  • This invention relates to improvements in steam turbines of the type wherein the working fluid expands chiefly within the first guide means or nozzles and the velocity energy and the residual pressure are subsequently fractionally absorbed by one or more sets of rotor blades alternating with stationary guide blades.
  • the last of the nozzles or group of nozzles to be closed by the governor may either be the foremost nozzle or the rearmost nozzle in the direction of rotation.
  • the maximum advantage of a device for preventing peripheral leakage of steam will be obtained when therefore a diminution of the leakage is of greater value.
  • Figure 1 represents the outlet openings of a group of nozzles
  • Figure 2 represents a section on the line AB of Figure 1;
  • Figure 3 is a diagrammatic sectional View of a group of nozzles fed through a common valve V;
  • Figure 4 is a view of the exit orifices of the nozzles of Figure 3;
  • Figure 5 is a diagrammaticsectional view corresponding to that of Figure 3 but showing a compound group of nozzles.
  • Figures 6 and 7 are part sections of Figure 3 on the lines 6-6 and 77 respectively.
  • Figure 2 shows the discharge angle a of the nozzle S to be more acute than the corresponding angle a of the nozzles S, S, S.
  • Figures 8, 4, 6 and 7 represent a nozzle segment or group N supplied with steam through a valve V which is controlled by the usual governor.
  • the leading nozzle orifice S is again smaller in its cross sectional area and in its radial dimension than the other nozzles S, S, S, and Figure 3 shows the thickening of the rear wall of the first nozzle S at T, which thickening, in conjunction with the more acute discharge angle of this first nozzle, causes the proximate edges of the jet from S, and the next jet from S to meet without interference substantially at the entrance edge of the first rotor rim M, and so in the usual manner through the guide rim G and succeeding rotor rim M
  • the rims M, and M are fixed to the common rotor R, and the guide rim G to the casing of the turbine.
  • Figure 5 shows a compound group of nozzles consisting of three groups fed from a common steam chest through valves V V, and V, respectively.
  • the action of the governor is arranged to operate on the three valves V,, V and V in succession, the valve V being the last to close and the first to open.
  • the leading nozzle S of the group fed from the valve V is constructed as hereinbefore described with a smaller cross-sectional area and radial dimension than the remaining nozzles S and is also furnished as in Figure 3 with a thickening T on its rearmost wall.
  • the advantage of this invention resides in the fact that at the foremost point or end of the nozzle segment, where the leakage would be greatest in the case of a higher pressure at the gap, there will take place almost no discharge of steam into the gap without doing work, and the maintenance of the higher pressure in the gap is thereby assured provided that the dimensions of the blades have been correctly chosen.
  • What I claim is 1.
  • the combination with a bladed rotor, of a group of guide nozzles of Which the leading nozzle has a smaller discharge angle than the adjacent posterior nozzle said nozzles arranged to direct their jets to meet without interference substantially at the entrance edge of the rotor bladm F.
  • the combination with a bladed rotor, of a group of guide nozzles of which the leading nozzle has a smaller discharge orifice than the adjacent posterior nozzle said nozzles arranged to direct their jets to impinge without interference ap-' proximately at the entering edge of the.
  • a steam turbine the combination with a. stage of rotor blading, of a group of nozzles serving same, the leading nozzle of said group being arranged to deliver steam to the blading stage at approximately the exist steam pressure of the stage, said leading nozzle having a smaller discharge angle than the other nozzles of the group, and said other nozzles being constructed to deliver steam to the blading at a pressure higher than its exit pressure from the stage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US731475A 1923-08-16 1924-08-11 Steam-turbine stage Expired - Lifetime US1697174A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1697174X 1923-08-16

Publications (1)

Publication Number Publication Date
US1697174A true US1697174A (en) 1929-01-01

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ID=7739735

Family Applications (1)

Application Number Title Priority Date Filing Date
US731475A Expired - Lifetime US1697174A (en) 1923-08-16 1924-08-11 Steam-turbine stage

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US (1) US1697174A (de)
AT (1) AT130062B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169747A (en) * 1961-01-06 1965-02-16 Bristol Siddeley Engines Ltd Rotary bladed power conversion machines
US6626641B1 (en) * 2000-10-24 2003-09-30 Alfred Conhagen, Inc. Nozzle for turbine
EP2295732A1 (de) * 2009-09-14 2011-03-16 Alstom Technology Ltd Axialturbine und Verfahren zur Abgabe eines Stroms aus einer Axialturbine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169747A (en) * 1961-01-06 1965-02-16 Bristol Siddeley Engines Ltd Rotary bladed power conversion machines
US6626641B1 (en) * 2000-10-24 2003-09-30 Alfred Conhagen, Inc. Nozzle for turbine
EP2295732A1 (de) * 2009-09-14 2011-03-16 Alstom Technology Ltd Axialturbine und Verfahren zur Abgabe eines Stroms aus einer Axialturbine
US20110064560A1 (en) * 2009-09-14 2011-03-17 Said Havakechian Axial turbine and method for discharging a flow from an axial turbine
JP2011058498A (ja) * 2009-09-14 2011-03-24 Alstom Technology Ltd 軸流タービン及び軸流タービンから流れを排出するための方法
CN102052090A (zh) * 2009-09-14 2011-05-11 阿尔斯托姆科技有限公司 轴流式涡轮机以及用于从轴流式涡轮机中排出流的方法
US8506233B2 (en) 2009-09-14 2013-08-13 Alstom Technology Ltd. Axial turbine and method for discharging a flow from an axial turbine
CN102052090B (zh) * 2009-09-14 2015-08-12 阿尔斯托姆科技有限公司 轴流式涡轮机以及用于从轴流式涡轮机中排出流的方法
DE102010044819B4 (de) 2009-09-14 2022-12-15 General Electric Technology Gmbh Axialturbine und ein Verfahren zum Abführen eines Stroms von einer Axialturbine

Also Published As

Publication number Publication date
AT130062B (de) 1932-10-25

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