EP1624246B1 - Steuerung der Dosierung eines Sicherheitssteuerungssystems mit zwei getrennten Steuerungsgesetze - Google Patents

Steuerung der Dosierung eines Sicherheitssteuerungssystems mit zwei getrennten Steuerungsgesetze Download PDF

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Publication number
EP1624246B1
EP1624246B1 EP05300643.3A EP05300643A EP1624246B1 EP 1624246 B1 EP1624246 B1 EP 1624246B1 EP 05300643 A EP05300643 A EP 05300643A EP 1624246 B1 EP1624246 B1 EP 1624246B1
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EP
European Patent Office
Prior art keywords
force
pressure
law
turbomachine
fuel
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Application number
EP05300643.3A
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English (en)
French (fr)
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EP1624246A1 (de
Inventor
Sylvain Poitout
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Safran Aircraft Engines SAS
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SNECMA SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/02—Liquid fuel
    • F23K5/14—Details thereof
    • F23K5/147—Valves

Definitions

  • the present invention relates generally to fuel injection systems in turbomachines and more particularly relates to a hydromechanical regulator of the force balance type with hydraulic servocontrol nozzle / pallet.
  • FIG. figure 9 A conventional hydromechanical regulator of the aforementioned type intended for a fuel injection system in a turbomachine is schematically illustrated in FIG. figure 9 . It is organized around a fuel dispenser 10 whose inlet duct 12a is connected to a high pressure pump 14 and the outlet duct 12b to a plurality of fuel injectors of a combustion chamber of the turbomachine 16 and the control of the fuel flow to flow into the injectors from the high pressure pump is provided by a force balance (or Tachymeter 20).
  • a force balance or Tachymeter 20
  • the scale mobile about an articulation axis 22 passing through a watertight partition, conventionally comprises a double-armed beam 24, 26 which, in steady state, is in equilibrium under the action of the three forces applied to it (see FIG. the figure 10 ).
  • a first force F1 (descending in the figure) is applied, at a distance Ld from the hinge pin, to a fixed point of its first arm 24 by the rod 18 of the fuel dispenser, via a first elastic member of the compressed spring type 28;
  • a second force F2, antagonist of the first is applied by a nozzle 30 which projects against the first lever arm (forming a pallet), at a fixed point at a distance Lb from the articulation axis, a jet of fuel under pressure;
  • a third force F3 (also descending in the figure) is applied, at a distance Ls from the axis of articulation, to a fixed point of its second arm 26.
  • a and B being constants.
  • the present invention relates to a hydromechanical regulator that overcomes the aforementioned drawbacks and thus allows with a single fuel dispenser the implementation of two different acceleration laws.
  • An object of the invention is also to ensure switching between the two laws of acceleration without risk of over or under fuel flow.
  • a hydromechanical regulator for controlling the flow of fuel injected into a turbomachine via a fuel metering device, comprising a tachometer balance having a beam with two arms movable about a hinge pin under the action of a first force applied by a control rod of the fuel dispenser, on the first arm, via a first elastic member, a second force, antagonistic to the first, applied to said first arm lever by a jet of fuel leaving a nozzle and a third force, antagonist of the first, applied to the second arm by an air bellows, characterized in that it further comprises a rod associated with a control piston for applying on said balance beam, via a second elastic member, a force counteracting said first force, so as to cause an additional opening of the dispenser of arburant when passing from a first motor acceleration law to a second motor acceleration law.
  • said first force is applied to a fixed point of the first lever arm at a distance Ld from said articulation axis and said counterforce is applied to another fixed point of said first lever arm at a distance Lc from said axis of joint.
  • said rod of the control piston is furthermore coupled to an on-off pneumatic valve ensuring switching between said first law of motor acceleration and said second law.
  • engine acceleration and connected firstly to a reference pressure P0 and secondly via air ports S0, S1 at a pressure P3 at the output of the high pressure compressor of the turbomachine.
  • said pressure P0 corresponds to the inlet pressure of the high pressure compressor, or to the atmosphere.
  • one of said air ports is adjustable to allow adjustment of said second acceleration law.
  • the invention also relates to the fuel metering device used in the aforementioned hydromechanical regulator and the turbomachine comprising this regulator.
  • the metering device comprises a single dosing light ensuring the flow of fuel injected into the turbomachine a continuous change during the passage of the first to the second motor acceleration law.
  • a hydromechanical regulator according to the invention intended to be implemented in a turbomachine is schematically illustrated in FIGS. Figures 1 and 2 .
  • This regulator is intended to regulate the fuel flow injected into the turbomachine by modifying the section of a metering orifice of the fuel metering device.
  • This modification aims to respect two laws of operation corresponding to the need for fuel for the acceleration of the turbomachine and to allow switching between these two laws.
  • the first law corresponds to the starting speed and the second to the operating speed, from idling to full throttle, depending on the speed of rotation of the turbomachine and the position of the throttle lever.
  • a high-pressure fuel pump 14 which draws fuel from a fuel tank (not shown) to bring it via a fuel dispenser 10 to injectors of a combustion chamber 16 of the turbomachine.
  • the modification of the section of the dosing orifice is obtained by the displacement of the rod 18 of the controlled dispenser through a compressed spring 28 by the balance of force 20 movable about its hinge axis 22 and comprising a plague with two arms 24, 26.
  • this beam is subjected to the downward force F1 applied by the rod 18 of the fuel metering device, via the first elastic member 28, to a fixed point of the first lever arm 24, at a distance Ld from the axis d articulation, as well as the upward force F2 applied by a nozzle 30 which projects a pressurized jet of fuel against this first lever arm, at a fixed point at a distance Lb from the axis of articulation, and at the downward force F3 resulting from the application in an air bellows 32 of a pressure differential ⁇ P3-P1, at a distance Ls from the hinge axis, fixed point of the second arm 26.
  • a valve The bellows protector 34 completes the architecture of this regulator, which of course also includes inputs and outputs for the high and low pressure hydraulic power supplies.
  • the balance of force balance 20 is further subjected to an additional upward force F4 which is applied to a fixed point of the first lever arm 24 at a distance Lc from the hinge axis ( less than the distance Ld in the illustrated example), by a rod 36 associated with a control piston 38, via a second resilient member of the compressed spring type 40 of stiffness Kc and resting force Fco.
  • the piston which slides in a cylinder 42 on a stroke Xc is controlled by a control pressure Pc supplying an inlet 42A of this cylinder, an output 42B of which is connected to the HP high-pressure supply.
  • the rod 36 is coupled to an on-off pneumatic valve 44 forming a two-position switch: in the "closed" position ( figure 1 ), the inlet of the air bellows 32 is isolated from a reference pressure P0 and is therefore connected directly to the pressure P3 and to the "open” position ( figure 2 ), the inlet of the air bellows 32 is connected to this pressure P0 and the pressure P3 via a pneumatic potentiometer formed by two orifices, an exhaust port S0 mounted in the supply line of the pressure P0 and a intake port S1 mounted in the pressure supply line P3.
  • the pressure P.sub.0 advantageously corresponds to the inlet pressure of the high-pressure compressor, or to the atmosphere and the air orifices S.sub.0 and S.sub.1 being identical, for the ratio .beta.1 the value 1 and the value 0.5 corresponding to the two acceleration laws sought.
  • This ratio is constant since the flow in the orifice S0 is sonic (which is obtained when ⁇ P3 / P0> 1.89 approximately).
  • one of the air orifices is adjustable (by means of a needle screw for example) for a precise adjustment of the second law of acceleration.
  • the figures 4 and 6 each show two curves corresponding to one 50 to a law of linear acceleration (in the case of a transient operating regime between reignition and idling) and the other 52 to a law of parabolic acceleration (case of a operating between idle and full throttle). These two curves overlap and the maximum flow rate of the first acceleration law is less than the minimum flow rate of the second acceleration law.
  • the figure 4 is a magnifying glass of the figure 6 at the level of the overlap zone of the two laws of acceleration.
  • the figures 5 and 7 each show the law of evolution of the metering flow, that is to say the variation of the injected flow rate Wf as a function of the position Xd of this metering device.
  • FIG. figure 8 The section of the single metering slit (or light) of the metering device 10 is illustrated in FIG. figure 8 (for a better understanding of the drawing the figure is not to scale). It has a shape determined by the two aforementioned laws of acceleration and which varies linearly as a function of Xd. With the law of linear acceleration (case of a transient operating regime between the reignition and the idle) corresponds a portion of rectangular slot 60 and the law of parabolic acceleration (case of a mode of operation between the idle and the full gas) corresponds to a portion of triangular slot 62, the adjustment of the initial flow rates can be effected by an orifice advantageously arranged in parallel with the metering device.
  • the configuration of the invention is particularly interesting because with a single metering system to achieve two flow laws we obtain a gain in weight and bulk.
  • the fact of using only one independent system and not two increases the reliability and reduces the number of possible failures.
  • this unique metering system allows a switching from one law to another without risk of rupture of the fuel flow during the transient and therefore without problem of "flame out" or engine overspeed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Supercharger (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Turbines (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • High-Pressure Fuel Injection Pump Control (AREA)

Claims (6)

  1. Hydromechanischer Regler zur Steuerung der in eine Turbomaschine mittels einer Treibstoffdosiereinrichtung (10) eingespritzten Treibstoffmenge, umfassend eine drehzahlabhängige Waage (20) mit einem zweiarmigen Waagebalken, der um eine Gelenkachse (22) unter der Wirkung einer ersten Kraft (F1), die mittels eines ersten Federorgans (28) über eine Betätigungsstange (18) der Treibstoffdosiereinrichtung an den ersten Arm (24) angelegt wird, einer zu der ersten entgegenwirkenden zweiten Kraft (F2), die mittels eines aus einer Düse (30) austretenden Treibstoffstrahls an den ersten Hebelarm angelegt wird, sowie einer zu der ersten entgegenwirkenden dritten Kraft (F3), die durch einen Luftbalg (32) an den zweiten Arm (26) angelegt wird, beweglich ist, dadurch gekennzeichnet, dass er ferner eine Stange (36), die einem Steuerkolben (38) zugeordnet ist, umfasst, um an den ersten Hebelarm mittels eines zweiten Federorgans (40) eine zu der ersten Kraft entgegenwirkende vierte Kraft (F4) anzulegen, um ein zusätzliches Öffnen der Treibstoffdosiereinrichtung beim Übergang von einem ersten Motorbeschleunigungsgesetz zu einem zweiten Motorbeschleunigungsgesetz zu bewirken.
  2. Hydromechanischer Regler nach Anspruch 1, dadurch gekennzeichnet, dass die erste Kraft an einem festen Punkt des ersten Hebelarms (24) in einem Abstand Ld von der Gelenkachse angelegt wird und dass die vierte Kraft an einem anderen festen Punkt des ersten Hebelarms (24) in einem Abstand Lc von der Gelenkachse angelegt wird.
  3. Hydromechanischer Regler nach Anspruch 1, dadurch gekennzeichnet, dass die Stange des Steuerkolbens ferner mit einem pneumatischen Ein-Aus-Ventil (44) gekoppelt ist, das die Umschaltung zwischen dem ersten Motorbeschleunigungsgesetz und dem zweiten Motorbeschleunigungsgesetz sicherstellt sowie einerseits mit einem Referenzdruck P0 und andererseits über Luftöffnungen S0 und S1 mit einem Druck P3 am Ausgang eines Hochdruckverdichters der Turbomaschine verbunden ist.
  4. Hydromechanischer Regler nach Anspruch 3, dadurch gekennzeichnet, dass der Druck P0 dem Druck am Eingang des Hochdruckverdichters oder der Atmosphäre entspricht.
  5. Hydromechanischer Regler nach Anspruch 3, dadurch gekennzeichnet, dass eine der Luftöffnungen einstellbar ist, um eine Einstellung des zweiten Beschleunigungsgesetzes zu ermöglichen.
  6. Turbomaschine, umfassend einen hydromechanischen Regler nach einem der Ansprüche 1 bis 5.
EP05300643.3A 2004-08-04 2005-08-02 Steuerung der Dosierung eines Sicherheitssteuerungssystems mit zwei getrennten Steuerungsgesetze Active EP1624246B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0408612A FR2874055B1 (fr) 2004-08-04 2004-08-04 Commande de dosage a deux lois de regulation dissociees pour regulateur de secours

Publications (2)

Publication Number Publication Date
EP1624246A1 EP1624246A1 (de) 2006-02-08
EP1624246B1 true EP1624246B1 (de) 2015-06-17

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EP05300643.3A Active EP1624246B1 (de) 2004-08-04 2005-08-02 Steuerung der Dosierung eines Sicherheitssteuerungssystems mit zwei getrennten Steuerungsgesetze

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US (1) US7395655B2 (de)
EP (1) EP1624246B1 (de)
JP (1) JP4686293B2 (de)
CN (1) CN1740538B (de)
BR (1) BRPI0503336B1 (de)
CA (1) CA2514435C (de)
FR (1) FR2874055B1 (de)
RU (1) RU2319845C2 (de)
UA (1) UA90994C2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2950390B1 (fr) * 2009-09-23 2011-10-21 Turbomeca Doseur de carburant ayant un dispositif de regulation ameliore.
CA2876972C (en) 2012-07-09 2017-05-16 Sko Flo Industries, Inc. Multi-stage back pressure regulators and associated devices, systems, and methods
CN102943712B (zh) * 2012-11-09 2015-01-14 沈阳黎明航空发动机(集团)有限责任公司 一种可变流量的燃料调节阀
CN105673209B (zh) * 2016-01-14 2017-08-22 中国航空动力机械研究所 用于航空发动机燃油系统的燃油分配器及航空发动机
CN111102080B (zh) * 2020-01-19 2020-09-29 广州珠江天然气发电有限公司 一种用于燃气轮机的转速控制装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757511A (en) * 1951-01-26 1956-08-07 Armstrong Siddeley Motors Ltd System for regulating the supply of liquid fuel to a gas turbine
GB700776A (en) * 1951-03-27 1953-12-09 Lucas Industries Ltd Control means for internal combustion prime movers
US3021674A (en) * 1955-01-31 1962-02-20 Bendix Corp Normal fuel control with acceleration override control for gas turbine engine
GB853706A (en) * 1955-08-11 1960-11-09 Lucas Industries Ltd Valves for controlling re-heat fuel supply systems for an aircraft gas turbine engine
US2968346A (en) * 1956-09-21 1961-01-17 United Aircraft Corp Maximum flow adjuster
US3975903A (en) * 1975-03-18 1976-08-24 United Technologies Corporation Fuel control
FR2509374B1 (fr) * 1981-01-19 1986-02-21 Snecma Dispositif de regulation de debit pour systeme d'alimentation en combustible liquide de moteur a turbine a gaz
FR2509375A1 (fr) * 1981-07-08 1983-01-14 Snecma Limiteur de deceleration, notamment pour une turbomachine
GB8320319D0 (en) * 1983-07-28 1983-09-01 Lucas Ind Plc Fuel control system
US5411239A (en) * 1993-01-06 1995-05-02 Delta-P Engineering, Inc. Valve actuator
US6250067B1 (en) * 1999-01-27 2001-06-26 United Technologies Corporation Thrust bump system for fuel controls

Also Published As

Publication number Publication date
EP1624246A1 (de) 2006-02-08
FR2874055A1 (fr) 2006-02-10
UA90994C2 (uk) 2010-06-25
JP2006046345A (ja) 2006-02-16
BRPI0503336A (pt) 2006-03-21
CN1740538A (zh) 2006-03-01
US7395655B2 (en) 2008-07-08
BRPI0503336B1 (pt) 2018-04-10
CA2514435C (fr) 2012-03-20
CN1740538B (zh) 2010-05-12
RU2005124344A (ru) 2007-02-10
JP4686293B2 (ja) 2011-05-25
RU2319845C2 (ru) 2008-03-20
FR2874055B1 (fr) 2006-11-24
CA2514435A1 (fr) 2006-02-04
US20060026947A1 (en) 2006-02-09

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