EP2598757A1 - Driving stage for a servo valve, and two-stage servo valve including such a stage - Google Patents
Driving stage for a servo valve, and two-stage servo valve including such a stageInfo
- Publication number
- EP2598757A1 EP2598757A1 EP11738446.1A EP11738446A EP2598757A1 EP 2598757 A1 EP2598757 A1 EP 2598757A1 EP 11738446 A EP11738446 A EP 11738446A EP 2598757 A1 EP2598757 A1 EP 2598757A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- column
- ejector
- servovalve
- fluid
- stage according
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 8
- 230000010287 polarization Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/0426—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with fluid-operated pilot valves, i.e. multiple stage valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
- F15B13/0436—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being of the steerable jet type
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2278—Pressure modulating relays or followers
- Y10T137/2322—Jet control type
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86582—Pilot-actuated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86582—Pilot-actuated
- Y10T137/8659—Variable orifice-type modulator
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86582—Pilot-actuated
- Y10T137/86606—Common to plural valve motor chambers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86622—Motor-operated
Definitions
- Servovalve pilot stage and two-stage servovalve including such a stage.
- the invention relates to a servovalve control stage, which can serve as a first stage in a two - stage servovalve.
- the invention also relates to a two-stage servo valve having a control stage of the aforementioned type.
- Jet servovalves are well known. It is known that they are more resistant to fluid pollution due to the greater distance between the ejector and the deflector, the distance separating a nozzle from the pallet.
- the jet servo drive stage includes an ejector for ejecting a jet of fluid to a receiver, such as a deflector or port.
- the ejector and receiver are movable relative to each other. The relative displacement of the jet leaving the ejector relative to the receiver allows the latter to create pressure differentials which are used to finely move the drawer of the distribution stage of the servovalve.
- the object of the invention is to propose a movable ejector pilot stage which is simpler than those known.
- a jet-type stage comprising an ejector for ejecting a jet of fluid which is displaceable facing a baffle adapted to generate a usable pressure differential for moving a slide of the servovalve and in which the ejector extends radially projecting from a column, the column being embedded at one of its ends through which the fluid is introduced into the column, the latter being subjected to the biasing of a torque motor at its other end to selectively twist the column in one direction or another around a rest position.
- the column is in one piece and the ejector is fixed at the end of a pipe which extends radially from the column while being in fluid communication with a central orifice of the column through which the ejector is fed. in fluid.
- the control stage according to the invention therefore uses a torsionally deformable element to move the ejector, acting directly on the deformable member which carries the ejector by means of a torque motor whose action on the column is constant regardless of the torsion angle thereof, keeping a large proportionality between the action of the motor and the displacement of the ejector, which allows a fine control of the angular position of the latter.
- the recessed end may be located in a lower portion of the servovalve, eliminating the need to pass a feed conduit from the ejector over the dispensing assembly.
- a central location of the column contributes to a balanced design of the servovalve that can improve its resistance to vibration and its dynamic response.
- the one-piece design of the torsion column reduces moving parts and seals between them.
- the invention also relates to a servovalve incorporating such a control stage.
- FIG. 1 is a block diagram of the application of the invention to a two-stage servovalve according to a first embodiment of the invention, the torque motor has been omitted;
- FIG. 2 is a sectional view along the line II-II of Figure 3 of a servovalve according to a second particular embodiment of the invention
- FIG. 3 is a sectional view along the line III-III of Figure 2;
- FIG. 4 is a view similar to that of Figure 3, the torque motor has been shown;
- FIG. 5 is a sectional view according to Figure V-V of Figure 6;
- FIG. 6 is a partial side view of the servovalve of FIGS. 2 to 5;
- FIG. 7 is a block diagram showing the respective polarizations of the pallet and the stator of the servovalve
- FIG. 8 is a view of the pilot stage of the servovalve according to a third embodiment.
- the invention is here illustrated in application to a two-stage barometric flow control servovalve including a control stage.
- the illustrated servovalve comprises a body 1 in which a drawer 2 is mounted to slide sealingly in a cylindrical orifice 3 forming the distribution stage.
- the servovalve rests on a support surface machined 1000 comprising a fluid supply port of the servovalve P, two U and U2 use ports and a return port R. These ports are in fluid communication with the corresponding ports of the support on which is fixed the servovalve.
- the drawer 2 is movable between two extreme positions and is shaped to define in the orifice 3 of the sealed chambers C1, C2, C3, C4 to place in communication respectively, according to the extreme position of the drawer 2 relative to a centered position (or neutral position):
- the slider 2 is controlled in the orifice 3 by means of control chambers 4,5 which are supplied with pressurized fluid by a pressure distribution member, in this case a deflector 6 engaged to seal in a housing 7 of the body 1.
- the deflector 6 comprises a central flat 8 in which a distribution orifice 9 is made.
- the distribution orifice 9 is placed in communication via ducts 10, 11 with the piloting chambers 4 and 5. Springs are provided to exert a counter-reaction to the induced piloting pressures on the slide 2, in order to be able to enslave in position this one.
- the central flattened area 8 extends an ejector 20 which ejects a jet of fluid towards the distribution orifice 9.
- the ejector 20 is displaceable facing the distribution orifice 9 so as to move the point of impact of the jet on the central flat 8, which has the effect of varying the pressures in the control chambers 4, 5 which allows to move the drawer in response to the displacement of the ejector 20. All this is well known and is only recalled to situate the context of the invention.
- the ejector 20 is integral with a torsionally rigid one-piece column 21 and is fixed at the end of a pipe which extends radially from it while being in fluid communication with a central orifice 22 of the column through which the ejector 20 is supplied with fluid.
- the column 21 has a first end 23 which is sealingly attached to the body 1 in a direction substantially perpendicular to the bearing face 1000 and through which the fluid is introduced into the central orifice of the column from the port of P supply (the supply duct is shown in dotted lines and can be directly drilled into the body 1).
- the first end of the column can be implanted in a lower part of the body 1, close to the pressure supply, eliminating the need to pass supply ducts of the ejector 20 over the distribution assembly.
- the column 21 has a second end 24 which is integral with the rotor 25 of a torque motor 26 whose stator 27 is fixed on the body 1.
- the torque motor 26 when the torque motor 26 is energized, it causes a twisting of the column 21 around its geometric axis Z, causing angular displacement of the ejector 20 facing the distribution orifice 9 so that the impact of the jet produced by the ejector 20 moves relative to the distribution orifice 9.
- the displacement of the point of impact of the jet is weak and is comparable to a translation along the tangent to the trajectory of the ejector 20. A large proportionality is maintained between this displacement and the torque imposed by the torque motor 26 on the column, and therefore with the supply current of it.
- the torque motor 26 When the torque motor 26 is not energized, the column 21 is at rest, and the jet produced by the ejector 20 impacts the central flat part 8 of the deflector at a location for which the pressures in the control chambers 4.5 s 'balanced.
- the deflector 6 is provided with adjustment means allowing its precise positioning in the housing 9 opposite the ejector.
- the servovalve comprises, as before, a body 101 in which a drawer 102 is slidably mounted.
- the control stage comprises a deflector 106 and an ejector 120 which is integral with a column 121 being mounted at the end of a pipe 130 which extends radially from the column 121.
- the column 121 has a first end which is recessed sealing in the body 101, and a second end 124 subjected to the action of a torque motor 126.
- the column 121 comprises a central orifice 122 for placing in fluid communication the ejector 120 and the port of supply P by the first end 123 via the central orifice 122 and the manifold 130. It is again noted that the recessed end of the column is located near the pressure supply of the servovalve.
- the column 121 has a torsion section 140 of small thickness, the rest of the column being, by comparison, very stiff torsion.
- the torsional stiffness of the column 121 thus depends essentially on the thickness, the diameter and the length of this torsional section. It is therefore easy to adapt the torsional stiffness of the column 121 by adjusting these manufacturing parameters.
- the torsional section has been made to extend over a portion of length of the central orifice 122, which achieves a low stiffness in relation to the stiffness of the column 121 (around 20%) in order to increase the angular displacement of the injector relative to the movement of the pallet 150
- the mounting torque will be all the lower, and the embedding can be guaranteed by a simple tight fit of the first end 123 of the column 121 in its housing. The seal is then guaranteed by a simple gasket 131.
- the column 121 is surrounded by a thin tube 127 which extends from a sole 128 fixed to seal on the body of the servovalve to a foot 129 coming to grip the end 124 of the column.
- the foot 129 and said end are fixed to each other so that upon torsion caused by the torque motor 126, the end tube 127 and the torsion portion 140 work in parallel and undergo torsion.
- This torque makes it possible to seal the chamber 145 in which the ejector 120 ejects the fluid, without recourse to a rubbing seal at the end of the column cooperating with the torque motor and capable of creating hysteresis.
- the elastic feedback between the slide 102 and the ejector 120, integral with the column 121 is here ensured by a flexible rod 132 connected at one of its ends to the column 121 and extending to the drawer 103.
- the rod 132 extends parallel to the column 121.
- the feedback rod 132 is, here, integral with the column 121. It will ideally take the form of a flexible blade 132 having generally the shape of a triangle. The base of this triangle is radially connected to the column 121, the opposite peak to this side is in connection with the drawer 103.
- the rod 132 is connected to the column 121 via a sleeve 160 fretted on the column 121. This sleeve 160 carries the rod 132 and rises beyond the pipe 130. A longitudinal notch allows the pipe 130 to be embedded in the sleeve 160, ensuring the mechanical connection between the flexible blade 132 and the ejector 120.
- the torque motor 126 is now detailed in relation with FIGS. 4 to 6.
- This comprises a pallet 150 which comprises two opposite arms 150a, 150b and which is connected to the foot 129 by screwing.
- the pallet 150 is surrounded by a ferromagnetic armature comprising two flanks 151, 152 which are connected in the upper part by a permanent magnet 153 polarized North-South in accordance with FIG.
- the flanks 151, 152 have active faces 155, 156 which immediately face faces of the pallet 150, leaving only a small air gap, on either side of the pallet 150.
- the permanent magnet 153 then generates magnetic fluxes, which pass through the active faces 155, 156 and are each closed in one of the arms of the pallet 150 on either side of the axis. The flows being equal, the pallet undergoes no torque.
- Coils 157, 158 arranged to surround each one of the arms of the pallet 150 are energized in opposition, thus produced on the pallet 150 a torque proportional to the product of the supply intensity of the coils 157 and the number of turns thereof to generate a magnetic flux within the pallet so as to obtain a north polarization on the portion 150a and a south polarization on the portion 150b (see Figure 7). It is this way created on the palette 150 a torque causing the twisting of the column 121 and the tube 127.
- this twist is very small, of the order of a few tenths of degrees. It will be sufficient to reverse the direction of the power supply of the coils to reverse the direction of the twist.
- the base 122 of the column 121 is embedded not by a tight fit, but by means of at least one clamping screw here two clamping screws 160 .
- the two stages of the servovalve can constitute a single module or be in the form of separate modules allowing a modular construction of servovalves.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Servomotors (AREA)
- Jet Pumps And Other Pumps (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1056269A FR2963393B1 (en) | 2010-07-29 | 2010-07-29 | SERVOVALVE PILOTAGE STAGE, WHICH CAN SERVE AS A FIRST FLOOR IN A SERVOVALVE WITH TWO FLOORS. |
PCT/EP2011/063153 WO2012013808A1 (en) | 2010-07-29 | 2011-07-29 | Driving stage for a servo valve, and two-stage servo valve including such a stage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2598757A1 true EP2598757A1 (en) | 2013-06-05 |
EP2598757B1 EP2598757B1 (en) | 2016-03-30 |
Family
ID=43662001
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11738446.1A Active EP2598757B1 (en) | 2010-07-29 | 2011-07-29 | Vorsteuerstuffe eines servoventils und zweistuffiges servoventil mit einer solchen vorsteuerstuffe |
Country Status (5)
Country | Link |
---|---|
US (1) | US8967179B2 (en) |
EP (1) | EP2598757B1 (en) |
ES (1) | ES2569030T3 (en) |
FR (1) | FR2963393B1 (en) |
WO (1) | WO2012013808A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2981133B1 (en) * | 2011-10-10 | 2013-10-25 | In Lhc | METHOD OF DETECTING FAILURE OF SERVOVALVE AND SERVOVALVE APPLYING. |
FR2981414B1 (en) * | 2011-10-12 | 2013-10-18 | In Lhc | SERVOVALVE HAS TWO FLOORS AND STEERING FLOOR SUITABLE FOR SUCH SERVOVALVE. |
USD746882S1 (en) * | 2013-12-16 | 2016-01-05 | Horizon Hobby, LLC | Swash servo mount |
FR3024505B1 (en) | 2014-07-31 | 2016-08-05 | Zodiac Hydraulics | SERVOVALVE WITH DOUBLE MOBILE ASSEMBLY |
FR3036765B1 (en) * | 2015-05-26 | 2017-05-19 | Zodiac Hydraulics | SERVOVALVE PILOTAGE STAGE, WHICH CAN SERVE AS A FIRST FLOOR IN A SERVOVALVE WITH TWO FLOORS. |
EP3284955B1 (en) * | 2016-08-18 | 2020-02-12 | Hamilton Sundstrand Corporation | Servo valve spool |
CN106762925B (en) * | 2017-03-13 | 2018-02-13 | 上海衡拓液压控制技术有限公司 | Dual master control valve integrates jet pipe servo valve |
EP3412921B1 (en) * | 2017-06-05 | 2024-03-13 | Hamilton Sundstrand Corporation | Servovalve assembly |
EP3537581B1 (en) * | 2018-03-08 | 2022-05-04 | Hamilton Sundstrand Corporation | Servovalve |
FR3079566B1 (en) * | 2018-03-30 | 2020-03-13 | Fluid Actuation & Control Toulouse | FLOW FLOW OR PRESSURE REGULATION SERVOVALVE |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1031716A (en) * | 1949-12-22 | 1953-06-25 | Askania Regulator Co | Improvements to nozzle relays |
DE1206602B (en) * | 1960-12-30 | 1965-12-09 | Continental Elektro Ind Ag | Nozzle control unit |
US3331383A (en) * | 1966-04-29 | 1967-07-18 | J D Buchanan | Electro-hydraulic servo valves |
US3401603A (en) * | 1967-03-03 | 1968-09-17 | Abex Corp | Fluidic-hydraulic servoactuator |
US3424183A (en) * | 1967-03-15 | 1969-01-28 | Abex Corp | Solenoid controlled servovalve with lineal output |
US3584649A (en) * | 1969-06-13 | 1971-06-15 | Bell Aerospace Corp | Resiliently deformable interconnection between driven and driving members in servo valve |
US3621880A (en) * | 1969-06-13 | 1971-11-23 | Bell Aerospace Corp | Jet pipe servo valve |
US4201114A (en) * | 1978-10-23 | 1980-05-06 | Textron Inc. | Electrohydraulic servovalve having removably attached feedback element |
US5303727A (en) * | 1992-12-18 | 1994-04-19 | Hr Textron Inc. | Fluidic deflector jet servovalve |
US7726340B2 (en) * | 2006-11-09 | 2010-06-01 | Honeywell International Inc. | Flexible, hermetic pivot seal for torque motor |
-
2010
- 2010-07-29 FR FR1056269A patent/FR2963393B1/en active Active
-
2011
- 2011-07-29 EP EP11738446.1A patent/EP2598757B1/en active Active
- 2011-07-29 US US13/812,920 patent/US8967179B2/en active Active
- 2011-07-29 WO PCT/EP2011/063153 patent/WO2012013808A1/en active Application Filing
- 2011-07-29 ES ES11738446.1T patent/ES2569030T3/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012013808A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20130206260A1 (en) | 2013-08-15 |
FR2963393A1 (en) | 2012-02-03 |
ES2569030T3 (en) | 2016-05-06 |
WO2012013808A1 (en) | 2012-02-02 |
US8967179B2 (en) | 2015-03-03 |
EP2598757B1 (en) | 2016-03-30 |
FR2963393B1 (en) | 2014-02-14 |
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