US3860356A - Mounting arrangement for an adjusting cylinder in an axial compressor - Google Patents

Mounting arrangement for an adjusting cylinder in an axial compressor Download PDF

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Publication number
US3860356A
US3860356A US376140A US37614073A US3860356A US 3860356 A US3860356 A US 3860356A US 376140 A US376140 A US 376140A US 37614073 A US37614073 A US 37614073A US 3860356 A US3860356 A US 3860356A
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US
United States
Prior art keywords
casing
piston rod
adjusting cylinder
internal chamber
axial compressor
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
US376140A
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English (en)
Inventor
Hans Benz
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.)
Brown Boveri Sulzer Turbomaschinen AG
Sulzer Escher Wyss AG
Original Assignee
Brown Boveri Sulzer Turbomaschinen AG
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 Brown Boveri Sulzer Turbomaschinen AG filed Critical Brown Boveri Sulzer Turbomaschinen AG
Application granted granted Critical
Publication of US3860356A publication Critical patent/US3860356A/en
Assigned to SULZER-ESCHER WYSS AG, A CORP OF SWITZERLAND reassignment SULZER-ESCHER WYSS AG, A CORP OF SWITZERLAND ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BROWN BOVERI-SULZER TURBOMACHINERY LIMITED, JAKOB WYDLER, LIQUIDATOR
Anticipated expiration legal-status Critical
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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/162—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for axial flow, i.e. the vanes turning around axes which are essentially perpendicular to the rotor centre line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/563—Fluid-guiding means, e.g. diffusers adjustable specially adapted for elastic fluid pumps

Definitions

  • ABSTRACT The adjusting cylinder is moved axially by a pair of servomotors mounted on the casing exterior via piston rods which pass into the casing interior is seal-tight manner Connecting rods having ball-headed ends connect the piston rods to the cylinders to compensate for radial movements of the adjusting cylinder relative to the casing.
  • Axial compressors have been known to have a casing defining an interior chamber sealed from an ambient zone as well as an adjusting cylinder within the chamber for adjusting the stator blades of the compressor.
  • the adjusting cylinder is mounted for axial slideable movement by means of two linear servomotors which are connected in parallel to each other relative to the flow of working medium therein.
  • the invention provides a compressor construction in which an adjusting cylinder mounted within a gas-tight chamber of a casing is moved axially by means of e.g., servomotors, disposed outside the interior of the compressor and in which a sealing means is used to seal the piston rods of the servomotors relative to the casing to form a gas-tight seal.
  • the sealing means is mounted on the external circumference of the piston rods for gas tight sealing at the positions at which the piston rods extend into the casing interior.
  • each piston rod is coupled to the adjusting cylinder by means of a connecting rod having ball head ends.
  • the ball-headed connecting rods ensure that, even in the event of relative displacements occurring between the cylinder and servomotors radially of the compressor due, for example, to installation inaccuracies and different thermal expansions resulting from different ambient temperatures and different materials between the compressor casing and the adjusting cylinder the pistons merely perform a motion which is centralized with respect to the axis of the servomotors and is performed in the direction of their axes.
  • the seal elements are not loaded by deflections which are perpendicular to the direction of the axes and which might otherwise cause leakage.
  • jamming of the servomotors is prevented by ensuring a purely axial motion of the piston rods.
  • the distance between the point at which the ball head rod acts on the adjusting cylinder and the point at which the ball head rod acts on the piston rod should be as large as possible. Moreover, this point should be positioned as close as possible to the piston rod bearing. It is therefore advantageous if the piston rods have a length which corresponds to the length of stroke of the servomotor and their ends are provided with an extension sleeve that is open on one side and cooperates with the seals. It is of course also feasible to construct the free end of the piston rods in hollow form in order to achieve this effect. However, in terms of manufacturing technology. this solution would be unfavorable because it would render accessibility to the connection position more difficult.
  • seal elements on the external circumference of the piston rods or the extension sleeves may also function as guides for a piston rod motion which is centered axially relative to the axis of the compressor.
  • FIG. 1 diagrammatically illustrates a view of an axial compressor construction in accordance with the invention with the upper half of a casing which is divided in the horizontal axial plane removed;
  • FIG. 2 illustrates a view taken along line [I II of FIG. I to an enlarged scale.
  • the compressor has an adjusting cylinder 1, comprising two part members of different diameters, which is supported in a casing 3 by means of rods 2 which are fixedly connected to the adjusting cylinder and are slidably mounted in support blocks 4 mounted in the casing 3.
  • the cylinder 1 is axially slideable by means of two linear servomotors 5 which are mounted on the outside of the casing 3 separately from an internal chamber 6 defined by the casing 3 of the compressor.
  • One of the servomotors 5 is controlled relative to a suitable operating variable, for example, the required delivery rate of the compressor.
  • the other servomotor 5 cooperates without control but is in synchronism with the first servomotor 5.
  • one servomotor 5 (the upper servomotor in FIG. 1) is indicated only by a return system comprising a disc cam 8 which is mounted on a piston rod 7 of the servomotor 5, and a bell crank 9 which slides on the disc cam 8 and, in turn, acts on a spool (not shown) which is disposed in a casing 10 and is conventionally used in hydraulic systems. Since the control for the servomotors 5 is conventional, no further description is believed to be necessary.
  • the motions of the piston rods 7 disposed in the servomotors 5 are transmitted to projections 13 which are secured to the adjusting cylinder 1, for example, by welding. As shown, the piston rods 7 extend into chambers 11 which communicate with the interior chamber 6 of the compressor and are sealed by seals 12. The projections 13 extend through slit apertures 21 in the casing 3 which communicate the interior chamber 6 with the chambers 11.
  • connecting rods 14 are provided between the piston rods 7 and the associated projection 13 with each connecting rod 14 having ball head ends 15.
  • the ball head ends 15 are each rotatbly received in a respective piston rod 7 and the adjusting cylinder l to form a universal joint at each end so as to compensate for radial movements between the cylinder 1 and casing 3.
  • one ball head of each rod 14 engages in a corresponding recess 16 of the associated piston rod 7 and is retained by a nut 17 having external screwthreading and having a central aperture for passage of the rod 14.
  • the other end 15 of each rod 14 bears in a bore 18 in a flanged end of a projection 13.
  • nut 17 having a central aperture is screwmounted in the bore 18 from one side and a second nut 19, which is not drilled but is provided with external screwthreading, is screwmounted from the other side.
  • Both nuts 17, 19 have recesses 22 which are adapted to the ball head 15.
  • connection between the connecting rods 14 and the piston rods 7 is positioned as far as possible from the projection 13 and is disposed near the piston rod bearing 23 (FIG. 2) in the wall of the respective servomotor 5.
  • the piston rod 7 is therefore kept as short as possible with a length corresponding approximately to the length of stroke of the piston (not shown) of the servomotor.
  • Each piston rod 7 is extended by having a tubular sleeve which is open at one end slidably mounted on the free end so that the connecting rod 14 is able, at any time, to carry out an unobstructed deflection in directions which are perpendicular to the rod axis.
  • each connecting rod 14 is disposed concentrically within a sleeve 20 in spaced radial relation to allow for deflections of the rod 14.
  • a sealing means including a pair of seal elements 12 of conventional construction are used. These seal elements 12 are each supported in the compressor casing 3 and may take the form of glands with or without liquid barriers or may take the form of rubber seals.
  • the seal elements 12 can be used, in conjunction with a bush 24 which is constructed of self lubricating material, to function as bearing and guide elements for the sleeve 20 attached to a piston rod 7.
  • each said connecting rod coupling one said piston rod to said adjusting cylinder, each said connecting rod having a ball head at each end rotatably received in a respective piston rod and in said adjusting cylinder.
  • each respective piston rod is of a length corresponding to the length of stroke of a respective said servomotor.
  • each said seal being mounted in said casing for guiding each respective piston rod for an axially centered motion.
  • an adjusting cylinder for stator blades axially slidably mounted in said internal chamber within said casmeans mounted on said casing, exteriorly of said internal chamber, for moving said adjusting cylinder axially relative to said casing, said means including at least one servomotor having a piston rod and a connecting rod coupling said piston rod to said adjusting cylinder, said connecting rod being rotatably received in said piston rod and said adjusting cylinder so as to form a universal joint at either end thereof; and
  • sealing means sealing said piston rod relative to said casing to form a gas tight seal therebetween.
  • said piston rod including an extension sleeve thereon projecting into said casing and having said sealing means thereon, said connecting rod being disposed concentrically within said sleeve in spaced radial relation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US376140A 1972-07-13 1973-07-03 Mounting arrangement for an adjusting cylinder in an axial compressor Expired - Lifetime US3860356A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1051572A CH553921A (de) 1972-07-13 1972-07-13 Verstelleinrichtung fuer die leitschaufeln eines axialverdichters.

Publications (1)

Publication Number Publication Date
US3860356A true US3860356A (en) 1975-01-14

Family

ID=4364037

Family Applications (1)

Application Number Title Priority Date Filing Date
US376140A Expired - Lifetime US3860356A (en) 1972-07-13 1973-07-03 Mounting arrangement for an adjusting cylinder in an axial compressor

Country Status (8)

Country Link
US (1) US3860356A (fr)
JP (1) JPS5222445B2 (fr)
CH (1) CH553921A (fr)
DE (1) DE2235188B2 (fr)
FR (1) FR2193429A5 (fr)
GB (1) GB1378604A (fr)
IT (1) IT991104B (fr)
NL (1) NL7309567A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222708A (en) * 1978-06-26 1980-09-16 General Electric Company Method and apparatus for reducing eccentricity in a turbomachine
GB2392956A (en) * 2002-09-12 2004-03-17 Honeywell Uk Ltd Controlling inlet to turbocharger turbine
WO2015031083A1 (fr) * 2013-08-29 2015-03-05 Dresser-Rand Company Ensemble de support destiné à une turbomachine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3042191C1 (de) * 1980-11-05 1982-04-01 Gebrüder Sulzer AG, 8401 Winterthur Verstelleinrichtung fuer die Leitschaufeln eines Axialverdichters
FR2681640B1 (fr) * 1991-09-25 1993-11-19 Snecma Turbomachine a aubes de stator a calage variable.
CN117948191B (zh) * 2024-03-26 2024-06-14 中国航发燃气轮机有限公司 一种燃气轮机及其静子叶片调节结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2861724A (en) * 1954-07-22 1958-11-25 Sidney M Kaplan Condiment shaker
US3094270A (en) * 1958-08-05 1963-06-18 Rolls Royce Annular valve device
US3154241A (en) * 1960-06-07 1964-10-27 Rolls Royce Compressors of gas turbine engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2861724A (en) * 1954-07-22 1958-11-25 Sidney M Kaplan Condiment shaker
US3094270A (en) * 1958-08-05 1963-06-18 Rolls Royce Annular valve device
US3154241A (en) * 1960-06-07 1964-10-27 Rolls Royce Compressors of gas turbine engines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222708A (en) * 1978-06-26 1980-09-16 General Electric Company Method and apparatus for reducing eccentricity in a turbomachine
GB2392956A (en) * 2002-09-12 2004-03-17 Honeywell Uk Ltd Controlling inlet to turbocharger turbine
WO2015031083A1 (fr) * 2013-08-29 2015-03-05 Dresser-Rand Company Ensemble de support destiné à une turbomachine
US10767660B2 (en) 2013-08-29 2020-09-08 Dresser-Rand Company Support assembly for a turbomachine

Also Published As

Publication number Publication date
DE2235188A1 (de) 1974-02-07
JPS5222445B2 (fr) 1977-06-17
GB1378604A (en) 1974-12-27
FR2193429A5 (fr) 1974-02-15
DE2235188B2 (de) 1975-08-21
JPS4958407A (fr) 1974-06-06
IT991104B (it) 1975-07-30
NL7309567A (fr) 1974-01-15
CH553921A (de) 1974-09-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SULZER-ESCHER WYSS AG, A CORP OF SWITZERLAND, SWIT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BROWN BOVERI-SULZER TURBOMACHINERY LIMITED, JAKOB WYDLER, LIQUIDATOR;REEL/FRAME:005221/0890

Effective date: 19890530