EP0552841A2 - Procédé et dispositif pour détecter du gaz non-dissou dans des circuits hydrauliques - Google Patents

Procédé et dispositif pour détecter du gaz non-dissou dans des circuits hydrauliques Download PDF

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Publication number
EP0552841A2
EP0552841A2 EP93200129A EP93200129A EP0552841A2 EP 0552841 A2 EP0552841 A2 EP 0552841A2 EP 93200129 A EP93200129 A EP 93200129A EP 93200129 A EP93200129 A EP 93200129A EP 0552841 A2 EP0552841 A2 EP 0552841A2
Authority
EP
European Patent Office
Prior art keywords
pressure
connection
reservoir
medium
piston
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
Application number
EP93200129A
Other languages
German (de)
English (en)
Other versions
EP0552841A3 (fr
EP0552841B1 (fr
Inventor
Klaus Leonhard Witt
Willi Schneider
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.)
Sun Test Systems BV
Original Assignee
Sun Electric Systems BV
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
Priority claimed from NL9200128A external-priority patent/NL9200128A/nl
Priority claimed from NL9200995A external-priority patent/NL9200995A/nl
Application filed by Sun Electric Systems BV filed Critical Sun Electric Systems BV
Publication of EP0552841A2 publication Critical patent/EP0552841A2/fr
Publication of EP0552841A3 publication Critical patent/EP0552841A3/xx
Application granted granted Critical
Publication of EP0552841B1 publication Critical patent/EP0552841B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding

Definitions

  • the invention relates to a method of detecting undissolved gas in a hydraulic control system of the type containing a hydraulic-medium pressure pump and a feed reservoir, and also to a device for carrying out said method.
  • the object of the invention is to provide a method and a device for carrying it out which make it possible to detect the presence of free gas and to determine the amount thereof in a simple way without removing any component and without the need for a complicated external measurement set-up.
  • the invention is based on the insight that the presence of undissolved gas in the hydraulic medium of a hydraulic control system has a direct influence upon the compressibility of thin medium.
  • the method of the invention is therefore carried out by checking the compressibility of the medium and deducting the amount of undissolved gas from the thus obtained information by taking into account that an increase of the amount of undissolved gas in the medium results in a decrease of the compressibility of this medium.
  • This method thus implies that the entire control system, both the high-pressure side and the low-pressure side, is brought to a first, predetermined pressure in a first phase and then is brought to a second, predetermined pressure in a second phase which means identical compression conditions for any gas bubbles present for both the high-pressure side and the low-pressure side, with the result that the amount of undissolved gas can be unambiguously determined from the observation of the volume fed to the system to be tested in the changeover from the first phase to the second phase.
  • This hydraulic medium can be drawn from a reservoir provided with a filling-level indicator and the change in the filling level of said reservoir can be observed, but it is also possible to supply the hydraulic medium via a volumetric flow meter.
  • a second way of carrying out the method according to the invention is described in claims 4-6.
  • This way of carrying out the inventive method is based on the insight that a reduced compressibility, caused by and indicating the presence of undissolved gas, is associated with aanother value of the difference between the filling level with the system at rest and the filling level with the system under pressure than the value of this difference which is obtained when tere is no undissolved gas in the system, as determined during a reference measurement. It is therefore possible to only determine the respective filling levels at regular moments in order to be able to detect the presence of undissolved gas reliably. If necessary, these determinations can be carried out in a controlled way by a suitable regulating system.
  • the reference numeral 2 indicates a hydraulic pressurised-medium reservoir having the normal fittings associated therewith and not explained in greater detail.
  • Said reservoir is connected via the conduit 4 to a feed pump 6 which is driven by the motor 8.
  • the high-pressure side 10 thereof is connected to a pressure-regulating device 16 with which a desired pressure can be accurately set at the output 18 thereof and which is of a type known per se.
  • the connection 20 of the pressure-regulating device 16 is connected to the return conduit 22, shown by broken lines, which leads to the reservoir 2.
  • the high-pressure conduits are shown by continuous lines in the figure; the low-pressure conduits by broken lines.
  • the installation contains a hydraulic shuttle valve 26 having the connections 26a, 26b, 26c and 26d; in the position of the shuttle valve shown, indicated by the symbol , the connection 26a is connected to the connection 26d and the connection 26c is connected to the connection 26b; in the second position indicated by the connection 26a is connected to the connection 26c and the connection 26b is connected to the connection 26d.
  • connection 26a is connected to the output 18 via the conduit 19, and the connection 26 is connected via the non-return valve 28 and via the conduit 30 to the high-pressure connection point 32 of the installation, which connection point 32 is designed to be connected via the aeroplane connection 34 to the high-pressure side of the control system to be tested.
  • the pressure at the connection 32 can be measured with the manometer 48 if the valve 52 is opened.
  • connection point 26b is connected via the conduit 38 and the conduit 40, in which a shut-off valve 42 is incorporated, to the connection point 44.
  • the installation is connected via the aeroplane connection 46 to the low-pressure side of the control system to be tested.
  • the pressure at the point 44 is measured with the manometer 48.
  • the conduit 40 is connected via the conduit 50 to the return conduit 22.
  • conduit 30 can be connected via the shut-off valve 52 to the connection point 44, with the result that a direct connection can be made via said valve between the high-pressure side and the low-pressure side of the control system to be tested and both are then at the same pressure, shut-off valve 42 being closed.
  • the embodiment shown in Figure 1 has, in addition, a measuring cylinder 52 in which a piston 44 can move freely along with the piston rod 56 which has a sealed bushing.
  • the piston 54 interacts with a graduated scale 58 with which the instantaneous position of the piston 56 can be determined.
  • the chamber 60 underneath the piston is connected via the conduit 62 to the conduit 30 and, therefore, to the high-pressure side 34 of the system to be tested, the annular chamber 64 above the piston being connected via the conduit 66 to the connection 26c of the shuttle valve 26.
  • the embodiment shown in Figure 1 is operated as follows: The pump 6 is put into operation and a first pressure is set with the aid of the regulating device 16 at the output 18 of the latter.
  • the valve 52 is opened, the valve 42 is closed and the shuttle valve 26 is in the position shown, with the result that the connection 26a is connected to the connection 26d and the connection 26c is connected to the connection 26b.
  • the pressure medium flows from connection 18 via 26a-26d, the non-return valve 28 and conduit 30 to the high-pressure connection 32 and to the low-pressure connection 44 of the installation to be tested. Via the open valve 52, the same pressure prevails at the low-pressure connection 44. All this has the consequence that the reservoir of the hydraulic control system, which is not in operation at that instant, is completely filled with pressure medium.
  • the chamber 64 above the piston 54 is connected to the return conduit 22.
  • the lower surface of the piston 54 is larger than the upper surface, with the result that the piston 54 will move fully upwards until it comes to rest against the upper edge of the cylinder 60.
  • the shuttle valve 26 is now set to the position ⁇ , with the result that 26a is connected to 26c and 26b is connected to 26d. Then the pressure at the connection 18 is increased until the pressure at the measurement point 48 assumes a first, predetermined value which is higher than before. For this purpose, a somewhat higher pressure must prevail at the connection 18 because the upper surface, which is under pressure, of the piston 54 is smaller than the lower surface of said piston. The piston 54 will then have moved downwards to a first position indicated by S1 and indicated by broken lines.
  • This position is indicated by means of the graduated scale 58 and noted.
  • the pressure at the connections 32 and 34 is increased to a second, predetermined higher value. This is achieved by increasing the pressure at the connection 18, as a result of which the piston 54 moves from the position S1 to the position S2 and an amount of pressure medium is therefore displaced from the chamber 60 underneath the piston and enters the hydraulic control system to be tested, via the conduit 62.
  • the amount of pressure medium displaced is directly dependent on the compressibility of the pressure medium contained in the control system and this compressibility is dependent in turn on the amount of undissolved gas in said pressure medium.
  • the difference between the positions S1 and S2 therefore represents directly the amount of undissolved gas in the system to be tested.
  • the procedure described above can be repeated, if necessary, one or more times.
  • the embodiment shown in Figure 2 differs from that shown in Figure 1 in that the displacement cylinder 60, together with piston 54, is replaced by a volumetric flow meter 60 in series with a non-return valve 62 and a flow limiter 64, all this being incorporated between the conduit 30 and the connection 26c of the shuttle valve 26.
  • the test procedure is essentially as described above, but with the difference that, after setting the pressure at the connections 32 and 34 to the first predetermined higher value with the aid of the volumetric flow meter 60, the amount of hydraulic medium which flows through the meter 60 is measured while the pressure is being increased to the second predetermined higher measurement value, for example 6 bar. This amount is directly dependent on the compressibility of the medium contained in the system and, therefore, on the amount of undissolved gas contained therein.
  • the hydraulic system depicted in Figure 3 comprises the conventional positive-displacement pump 102 (which, when it is at rest, may be replaced by an additional external pump indicated by 102') whose high-pressure side 102a is connected via a nonreturn valve 104, on the one hand, via the conduit 106 to a load 108 to be driven by the hydraulic system and, on the other hand, via the conduit 110 to the cylinder volume 112 of a positive-displacement cylinder 114 which contains the piston 116.
  • Said piston 116 is connected via the common piston rod 118 to the second piston 120 present in a second positive-displacement cylinder 122 in which the chamber 124 behind the piston is connected via the conduit 126 to the low-pressure side 102b of the positive-displacement pump 102 and via the conduit 128 to the load 108.
  • Such systems containing closed feed reservoirs on the high-pressure side and the low-pressure side respectively are used, in particular, in aircraft. They are therefore known per se and are described, for example, in DE-U-2735554.
  • the presence of undissolved, that is to say free, gas in such a system is very undesirable and the invention provides the possibility of detecting the presence thereof by checking the compressibility of the hydraulic medium.
  • the system is first well vented via the existing venting connections on the high-pressure side and the low-pressure side, indicated in Figure 3 by 130 and 132, respectively, and the reservoirs 114 and 122 are filled with the correct amount of hydraulic medium.
  • the system can be vented, for example, by a venting system to be connected separately, in which case air is extracted from the system with the aid of a vacuum system, or in some other suitable way.
  • the filling level of one of the reservoirs is measured. In the example shown in Figure 3, this is the filling level of the cylinder 114, which is determined by observing the position of the piston 116. In Figure 3, this position is indicated by a solid triangle 134 opposite the scale 136. This position is noted, that is to say recorded.
  • the system is then put into operation, which can be done by driving the pump 102 or by connecting the external driven pump 102' via the connections 130', 132' and the conduits 120', 126', which has the consequence that the position of the piston 116 will change: the piston 116 will move to the right, for example, to the position indicated by the triangle 134a drawn with broken lines. This position is also noted.
  • the data thus obtained are reference data which apply to a system in which there is no undissolved gas.
  • the position of the piston 116 is thus first determined with the system at rest and then the position of the piston 16 with the system in operation. If the difference between the two positions is greater than the difference determined in the reference measurement, this indicates the presence of undissolved gas.
  • the memory 144 thus contains two measure values, the difference between which can be determined and can be retrieved via the addressing device 146; this difference can then be shown on a display 148 as an indication of the presence of undissolved gas.
  • the electronic signal processing device can, if necessary, allow for varying operational conditions, for example for the temperature of the medium present in the reservoirs 114 or 122 and for the actual filling level of the reservoir, and for the actual pressures prevailing during the measurements.
  • Figure 4 illustrates the application of the method and device according to the invention to a hydraulic system having a single reservoir.
  • parts and components corresponding to those which have already been discussed by reference to Figure 3 have been indicated with the same reference numerals as those used in Figure 4.
  • the conventional positive-displacement pump 102 whose high-pressure side 102a is connected to the load 108 via the nonreturn valve 104 and the conduit 106; the low-pressure side 102b is connected via the conduit 126 to the open reservoir 127 which is filled with hydraulic medium 129.
  • the low-pressure side of the load 108 is also connected via the conduit 128 to said reservoir.
  • Figure 4 also shows the connections 130', 132', via which the system can be vented or connected to the external hydraulic pump 102'.
  • the system is first well vented and then the reservoir 129 is filled with the correct amount of hydraulic medium.
  • the filling level of the reservoir 127 is measured by observing the position of the surface 131 of the medium 129. This position is indicated by the solid triangle 134'. Said position is noted, that is to say recorded.
  • the liquid level 131 will drop, for example to the level indicated by the outline triangle 134a'. This position is also noted.
  • these data are reference data which are applicable to a system which contains no undissolved gas.
  • a suitable position-measuring device 140 in this case, for example, an optical one, which interacts with the electronic processing unit 142 having the memory 144 present therein, the addressing device 146 and the display 148, all these features being as described by reference to Figure 3.
  • the reservoir 127 shown as open in Figure 4 may also be sealed by means of a membrane or piston present between the hydraulic medium and the outside air, while the method according to the invention when applied to a system as shown in Figure 4 can also be carried out in conjunction with the pressurisation of the reservoir 127, with the result that air present in the low-pressure side is also reliably detected.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Measuring Fluid Pressure (AREA)
  • Accessories For Mixers (AREA)
EP93200129A 1992-01-23 1993-01-19 Procédé et dispositif pour détecter du gaz non-dissou dans des circuits hydrauliques Expired - Lifetime EP0552841B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL9200128A NL9200128A (nl) 1992-01-23 1992-01-23 Werkwijze en inrichting voor het detecteren van niet opgeloste gassen in een hydraulisch systeem.
NL9200128 1992-01-23
NL9200995A NL9200995A (nl) 1992-06-05 1992-06-05 Werkwijze en inrichting voor het detecteren van onopgelost gas in een hydraulisch besturingssysteem.
NL9200995 1992-06-05

Publications (3)

Publication Number Publication Date
EP0552841A2 true EP0552841A2 (fr) 1993-07-28
EP0552841A3 EP0552841A3 (fr) 1994-12-21
EP0552841B1 EP0552841B1 (fr) 1999-06-09

Family

ID=26646927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93200129A Expired - Lifetime EP0552841B1 (fr) 1992-01-23 1993-01-19 Procédé et dispositif pour détecter du gaz non-dissou dans des circuits hydrauliques

Country Status (4)

Country Link
EP (1) EP0552841B1 (fr)
AT (1) ATE181142T1 (fr)
DE (1) DE69325190T2 (fr)
ES (1) ES2134239T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1004028C2 (nl) * 1996-09-13 1998-03-16 Sun Electric Systems Bv Werkwijze voor het bepalen van de hoeveelheid onopgelost gas in een hydraulisch systeem.
US8381583B2 (en) 2009-09-29 2013-02-26 Sun Test Systems B.V. Method for determining a functioning of a gas bleed valve
DE102004038801B4 (de) * 2004-08-10 2014-05-22 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zur Erkennung von Gaseinschlüssen in einem zähflüssigen Medium
DE102013224744A1 (de) * 2013-12-03 2015-06-03 Zf Friedrichshafen Ag Verfahren zum Reduzieren von Luftansammlungen
CN110985462A (zh) * 2019-12-12 2020-04-10 四川凌峰航空液压机械有限公司 排除脉冲试验作动筒及其管路气体的液压系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012221954A1 (de) * 2012-11-30 2014-06-05 Robert Bosch Gmbh Gaserkennungsvorrichtung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089206A (en) * 1975-09-27 1978-05-16 Maschinenfabrik Hennecke Gmbh Method and apparatus for measuring the proportion of undissolved gas in a liquid component for the production of foam materials
EP0022394A1 (fr) * 1979-07-05 1981-01-14 AMS, société anonyme Méthode et dispositif de contrôle de dégazage d'un circuit hydraulique
FR2474196A1 (fr) * 1980-01-22 1981-07-24 Armines Cellule pour la determination de la relation, a temperature donnee, entre pression et volumes respectivement liquide et gazeux d'un produit et/ou melange en phases liquide et gazeuse
US4329869A (en) * 1979-07-27 1982-05-18 Kabushiki Kaisha Polyurethan Engineering Apparatus for measuring the amount of air bubbles contained in liquid
DE3233551A1 (de) * 1982-09-10 1984-03-15 Danfoss A/S, 6430 Nordborg Vorrichtung zur erfassung des gasanteils in einem unter druck stehenden fluessigkeitssystem
FR2547051A1 (fr) * 1983-06-06 1984-12-07 Petroles Cie Francaise Appareillage de mesure pour l'etude des relations entre la pression et les volumes liquide et/ou gazeux pour un produit a phases liquide et/ou gazeuse
FR2572530A1 (fr) * 1984-10-26 1986-05-02 Armines Appareillage automatique de mesure de fractions vaporisees de corps purs et/ou melanges et des densites des phases liquide et/ou vapeur avec prelevement d'echantillons de phase vapeur
EP0206119A1 (fr) * 1985-06-13 1986-12-30 Shen, Hanshi Petroleum and Chemical Factory Procédé et appareil pour éliminer la cavitation dans les systèmes hydrauliques
EP0451752A2 (fr) * 1990-04-12 1991-10-16 Afros S.P.A. Méthode et appareil pour analyser le gaz contenu dans un liquide

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089206A (en) * 1975-09-27 1978-05-16 Maschinenfabrik Hennecke Gmbh Method and apparatus for measuring the proportion of undissolved gas in a liquid component for the production of foam materials
EP0022394A1 (fr) * 1979-07-05 1981-01-14 AMS, société anonyme Méthode et dispositif de contrôle de dégazage d'un circuit hydraulique
US4329869A (en) * 1979-07-27 1982-05-18 Kabushiki Kaisha Polyurethan Engineering Apparatus for measuring the amount of air bubbles contained in liquid
FR2474196A1 (fr) * 1980-01-22 1981-07-24 Armines Cellule pour la determination de la relation, a temperature donnee, entre pression et volumes respectivement liquide et gazeux d'un produit et/ou melange en phases liquide et gazeuse
DE3233551A1 (de) * 1982-09-10 1984-03-15 Danfoss A/S, 6430 Nordborg Vorrichtung zur erfassung des gasanteils in einem unter druck stehenden fluessigkeitssystem
FR2547051A1 (fr) * 1983-06-06 1984-12-07 Petroles Cie Francaise Appareillage de mesure pour l'etude des relations entre la pression et les volumes liquide et/ou gazeux pour un produit a phases liquide et/ou gazeuse
FR2572530A1 (fr) * 1984-10-26 1986-05-02 Armines Appareillage automatique de mesure de fractions vaporisees de corps purs et/ou melanges et des densites des phases liquide et/ou vapeur avec prelevement d'echantillons de phase vapeur
EP0206119A1 (fr) * 1985-06-13 1986-12-30 Shen, Hanshi Petroleum and Chemical Factory Procédé et appareil pour éliminer la cavitation dans les systèmes hydrauliques
EP0451752A2 (fr) * 1990-04-12 1991-10-16 Afros S.P.A. Méthode et appareil pour analyser le gaz contenu dans un liquide

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1004028C2 (nl) * 1996-09-13 1998-03-16 Sun Electric Systems Bv Werkwijze voor het bepalen van de hoeveelheid onopgelost gas in een hydraulisch systeem.
EP0829648A1 (fr) * 1996-09-13 1998-03-18 Sun Electric Systems B.V. Méthode et appareil pour déterminer la quantité de gaz non-dissou dans un système hydraulique
US6081767A (en) * 1996-09-13 2000-06-27 Sun Electric Systems B.V. Method and device for determining the amount of undissolved gas in a hydraulic system
DE102004038801B4 (de) * 2004-08-10 2014-05-22 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zur Erkennung von Gaseinschlüssen in einem zähflüssigen Medium
US8381583B2 (en) 2009-09-29 2013-02-26 Sun Test Systems B.V. Method for determining a functioning of a gas bleed valve
DE102013224744A1 (de) * 2013-12-03 2015-06-03 Zf Friedrichshafen Ag Verfahren zum Reduzieren von Luftansammlungen
DE102013224744B4 (de) 2013-12-03 2024-04-04 Zf Friedrichshafen Ag Verfahren zum Reduzieren von Luftansammlungen
CN110985462A (zh) * 2019-12-12 2020-04-10 四川凌峰航空液压机械有限公司 排除脉冲试验作动筒及其管路气体的液压系统
CN110985462B (zh) * 2019-12-12 2021-08-06 四川凌峰航空液压机械有限公司 排除脉冲试验作动筒及其管路气体的液压系统

Also Published As

Publication number Publication date
EP0552841A3 (fr) 1994-12-21
ES2134239T3 (es) 1999-10-01
EP0552841B1 (fr) 1999-06-09
DE69325190T2 (de) 1999-10-28
DE69325190D1 (de) 1999-07-15
ATE181142T1 (de) 1999-06-15

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