US2794616A - Nozzle box assembly - Google Patents

Nozzle box assembly Download PDF

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Publication number
US2794616A
US2794616A US449587A US44958754A US2794616A US 2794616 A US2794616 A US 2794616A US 449587 A US449587 A US 449587A US 44958754 A US44958754 A US 44958754A US 2794616 A US2794616 A US 2794616A
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US
United States
Prior art keywords
nozzle
turbine
box
nozzle box
housing
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
US449587A
Other languages
English (en)
Inventor
Bernasconi Felix
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
Application granted granted Critical
Publication of US2794616A publication Critical patent/US2794616A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F04D9/06—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock of jet type
    • 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
    • F01D9/06—Fluid supply conduits to nozzles or the like

Definitions

  • This invention relates to a nozzle box "assembly for high temperature steam and gas turbines, and more particularly to a nozzle box assembly which includes a regulator valve having a single seat on a diffuser nozzle supplying motive fluid to a nozzle box.
  • Objects of the invention are to provide a nozzle box assembly including a regulator valve having a single seat on a diffuser body and which may be readily installed in a nozzle box housing integral with or attached to the high pressure housing of a steam or gas turbine.
  • An object is to provide nozzle box assemblies comprising regulator valves, difluser-nozzles and inlet connections which may be symmetrically disposed about the axis of the turbine housing.
  • An object is to provide nozzle box assemblies of the type stated in which adjacent portions of the diffuser body and the inlet connection are maintained at substantially the same temperature by the operating medium.
  • the reference numeral 1 identifies the wall of the high pressure housing or so-called wheel box in which is arranged an impulse wheel 2 provided with a surrounding ring of buckets or blades 3 upon which high temperature motive fluid from a nozzle box 4 is directed by nozzle 5.
  • a substantially tubular inlet member 6 extends radially outward from and is integral with the nozzle box 4; the inlet member having an internal shoulder 7 intermediate its length thread-ed upon the inner end 8 of a diffuser body 9 to clamp the outer end flange 6a of the inlet body 6 and an external flange 10 of the diffuser body 9 upon seats 11 at the oppo- 2,794,6i6 Patented June 4, 1957 site faces of an internal shoulder 12 of a generally cylindrical nozzle box housing 13 extending radially from the wheel box 1 and having an opening 14 for admission of the motive fluid to an inlet chamber 15.
  • a disk regulating valve -16 seats upon the outer end of the diffuser body 9 and its stem 17 extends into a chamber 18 by which it is supported for axial movement for control by a servomotor, not shown, or by a customary variable transmission actuated by a speed regulator.
  • the inlet connection 6 is of less diameter than the bore of housing 13 in which it is mounted, and has external shoulders 6b axially spaced along the same for supporting a cylindrical radiation guard 19 which is radially spaced from housing -13by' an annular gap 20 through which expanded motive fluid is withdrawn from the in- Y terior-of housing 1 to serve as a cooling agent.
  • a helically coiled wire 21 is preferably arranged in the annular space 20 to guide the cooling agent along an elongated path, as indicated by the arrows a, to a suction pipe outlet 22 which may be connected to the turbine housing, for example after the second reaction stage.
  • the portion of the inlet connection between the threaded shoulder 7 and its outer end 6a constitutes an expansion neck which is spaced radially from the diffuser body 9 by an annular chamber 23 through which a flow of the heated motive fluid is established from inlet openings 24 through the outer end of difiuser body 9 and outlet openings 24 at its inner end. A portion of the motive fluid thus flows through the annular chamber 23 because of the pressure drop along the flaring bore of the difiuser body 9.
  • the described screw connection of the nozzle box inlet to the diifuser body results in several advantages. It provides a simple, space-saving solution for the problem of mounting the nozzle boxes in a housing integral with or attached to the turbine wheel box, and one which permits the nozzle box housings to be arranged radially of the turbine axis, whereby the nozzle box housings may "be independent of each other and symmetrically arranged around the entire turbine wheel box. Nonuniform thermal stressing of the wheel box is further reduced by exhausting expanded working fluid through the nozzle box housings and the provision of the guide coil 21 in the :cooling passage reduces the quantity of fluid required for a given cooling effect.
  • the threaded shoulder 7 of the inlet connection 6 is at some distance from its outer end 612, the relatively long heated section 60 reduces the stresses imposed on the screw connection by temperature difierences.
  • nozzle box housings may be integral with the wheel box, as shown, or may be separately formed and secured to the wheel box by bolts or by welding, as has been customary in the past.
  • a high temperature fluid turbine having a wheel box enclosing a turbine wheel, a generally cylindrical nozzle box housing extending radially from the turbine wheel box, said housing being provided with a motive fluid inlet and having an internal shoulder positioned radially inward of said inlet, said shoulder having an inner and an outer annular face, a diffuser body having a flaring bore therethrough and an outer external flange seated on the outer face of said housing shoulder, a nozzle box having a generally tubular inlet member telescoped over and threaded upon said diffuser body and having an outer end flange seated against the inner face of said housing shoulder, a nozzle on said nozzle box for directing motive fluid upon the turbine wheel, and valve means in said housing and adjacent said motive 3 fluid inlet for controlling the flow of motive fluid through said nozzle.
  • valve means comprises a disk valve having a seat on the outer end of said diffuser body, and means including a valve stem supporting said disk valve for axial movement with respect to its seat on said diffuser body.
  • inlet member has a diameter less than that of the bore of the nozzle box housing to provide an annular cooling space opening at its inner end into said turbine wheel box, and means comprising a suction outlet communicating with the outer v 4 s end of said cooling space for establishing a flow of expanded' motive fluid therethrough.
  • tubular inlet member has external shoulders axially spaced along the same, in combination with a cylindrical radiation shield supported on said inlet member shoulders constituting the inner wall of the annular cooling space, the Wall of the bore of the nozzle box housing constituting the outer wall of the annular cooling space.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US449587A 1953-08-14 1954-08-13 Nozzle box assembly Expired - Lifetime US2794616A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH752756X 1953-08-14

Publications (1)

Publication Number Publication Date
US2794616A true US2794616A (en) 1957-06-04

Family

ID=4534032

Family Applications (1)

Application Number Title Priority Date Filing Date
US449587A Expired - Lifetime US2794616A (en) 1953-08-14 1954-08-13 Nozzle box assembly

Country Status (7)

Country Link
US (1) US2794616A (de)
BE (1) BE531134A (de)
CH (1) CH313641A (de)
DE (1) DE943052C (de)
FR (1) FR1106499A (de)
GB (1) GB752756A (de)
NL (1) NL95371C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642025A (en) * 1983-06-09 1987-02-10 Bbc Brown, Boveri & Company, Limited Valve for steam supply on double casing turbines
US5823742A (en) * 1995-12-15 1998-10-20 Dresser-Rand Company Variable and bidirectional steam flow apparatus and method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1085169B (de) * 1957-03-18 1960-07-14 Licentia Gmbh Durchfuehrung des Dampfzufuehrungs-Rohransatzes eines Duesenkastens durch das Innengehaeuse einer Dampfturbine
DE1192009B (de) * 1959-10-16 1965-04-29 Hermann Rappold & Co G M B H Absperrschieber, insbesondere Heisswind-schieber
JPH0621521B2 (ja) * 1983-06-10 1994-03-23 株式会社日立製作所 蒸気タ−ビンの主蒸気入口構造
JPH0674722B2 (ja) * 1984-10-15 1994-09-21 株式会社日立製作所 蒸気タ−ビンの蒸気導入部構造
EP1813777A1 (de) * 2006-01-31 2007-08-01 Siemens Aktiengesellschaft Fixierung Düsengehäuse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1008576A (en) * 1906-02-17 1911-11-14 Gen Electric Method of and apparatus for altering the condition of gases.
US2218788A (en) * 1937-11-26 1940-10-22 Allis Chalmers Mfg Co Nozzle chest attachment
US2275830A (en) * 1939-06-17 1942-03-10 Gen Electric Elastic fluid turbine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE659086C (de) * 1936-04-15 1938-04-25 Schmidt Sche Heissdampfgesells Einrichtung zum Verbinden der in dem Behaelter eines Waermeaustauschers angeordneten Heizkoerper mit Rohren ausserhalb des Behaelters

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1008576A (en) * 1906-02-17 1911-11-14 Gen Electric Method of and apparatus for altering the condition of gases.
US2218788A (en) * 1937-11-26 1940-10-22 Allis Chalmers Mfg Co Nozzle chest attachment
US2275830A (en) * 1939-06-17 1942-03-10 Gen Electric Elastic fluid turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642025A (en) * 1983-06-09 1987-02-10 Bbc Brown, Boveri & Company, Limited Valve for steam supply on double casing turbines
US5823742A (en) * 1995-12-15 1998-10-20 Dresser-Rand Company Variable and bidirectional steam flow apparatus and method

Also Published As

Publication number Publication date
CH313641A (de) 1956-04-30
GB752756A (en) 1956-07-11
NL95371C (de) 1960-04-19
DE943052C (de) 1956-05-09
BE531134A (de) 1954-08-31
FR1106499A (fr) 1955-12-19

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