EP0585280B1 - Method of measuring the pressure of a gas in a gas accumulator, and a device for carrying out the method - Google Patents

Method of measuring the pressure of a gas in a gas accumulator, and a device for carrying out the method Download PDF

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Publication number
EP0585280B1
EP0585280B1 EP92909795A EP92909795A EP0585280B1 EP 0585280 B1 EP0585280 B1 EP 0585280B1 EP 92909795 A EP92909795 A EP 92909795A EP 92909795 A EP92909795 A EP 92909795A EP 0585280 B1 EP0585280 B1 EP 0585280B1
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EP
European Patent Office
Prior art keywords
gas
pressure
accumulator
fluid
gas accumulator
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Expired - Lifetime
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EP92909795A
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German (de)
French (fr)
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EP0585280A1 (en
Inventor
Günter Peter
Norbert Weber
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Hydac Technology GmbH
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Hydac Technology GmbH
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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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/18—Anti-extrusion means
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/43—Anti-extrusion means
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/505—Testing of accumulators, e.g. for testing tightness
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/51—Pressure detection
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/515—Position detection for separating means

Definitions

  • the invention relates to a method for measuring the pressure of a gas in a gas pressure accumulator, which is connected to a fluid circuit, which has a pressure transducer and in which the gas is separated from the fluid via a separating element, and to a gas pressure accumulator for performing this method.
  • Gas pressure accumulators such as piston accumulators, membrane accumulators or bladder accumulators, have a preselectable pressure setpoint on their connection to the respective fluid circuit, which is also referred to as the gas preload of the accumulator.
  • JP-A-1-73232 In a generic method for measuring the pressure of a gas in a gas pressure accumulator according to JP-A-1-73232, a pressure measurement curve is created over time, in which the liquid pressure initially increases very strongly in a straight line, and then gradually increases to a gentle one with increasing measurement time to pass the rising curve. It has been shown that at the point of the transition between the linear and the curved measurement pressure curve, the gas pressure in the storage bladder corresponds exactly to the fluid pressure measured at this point. In order to shorten the measuring time, the known method specifies that a measurement should only be carried out in the time interval or within the “window” in which experience has shown that the kink point mentioned is expected within the measuring curve. From JP-A-1-54325, which discloses a comparable, generic method, it is known to carry out the mentioned measurement at predeterminable regular time intervals by means of a time measuring device.
  • the object of the invention is to create a method and a gas pressure accumulator for carrying out this method which allow the gas pretension to be checked without the operational readiness of the associated fluid circuit being impaired and which enable accurate and rapid measurement value acquisition, even if the respective gas pressure accumulator fails from the gas side due to material failure.
  • This object is achieved by a method having the features of claim 1 and a gas pressure accumulator having the features of claim 2.
  • the gas pressure which can be assigned to it in this position is measured by means of the pressure transducer and the assumption of this predefinable position is determined by means of a monitoring device which causes the measured value to be recorded by means of the pressure transducer.
  • the predeterminable position of the separating element which can consist of a piston, a membrane or a bladder, is selected in such a way that the gas pressure that can be assigned to it is known, for example ascertained by experimental measurements.
  • This assignable gas pressure can be measured by the pressure sensor arranged on the fluid side and set in relation to the desired gas pressure setpoint or the gas preload. If the gas pressure actual value falls below this latter value, the gas pressure accumulator can be refilled using the mentioned filling device. With the approach mentioned, the storage can be continuously monitored and the operational readiness of the fluid circuit is not impaired.
  • the separating element is monitored with regard to its position and, in the manner of a "punctual" measurement value detection at predetermined times, gas detection values of the gas pressure accumulator lying outside the expected range are reliably detected, so that misinterpretations and assumptions that the measuring device is not reliable works, are largely avoided. This also applies in the event that the gas pressure accumulator becomes unusable from the gas side due to material failure. Due to the possible "selective" measurement value acquisition of the associated gas pressure preload value, the fluid circuit in the safety-relevant area can be switched off immediately without the need for complex measurement curves and evaluations, as in the previously known methods.
  • the gas pressure accumulator according to the invention with the features of claim 2 realizes the described method according to the invention, with which the recording of measured values and, if appropriate, the refilling of the gas pressure accumulator can be automated.
  • the sole figure shows the lower part of a bladder accumulator, the left half of the image facing the viewer representing the accumulator in one of its working positions and the right half in the measuring position.
  • the gas pressure accumulator in the form of the bladder accumulator according to the drawing has a steel container as the housing 10.
  • the gas in the form of nitrogen and the pressure fluid in the form of hydraulic oil are separated from one another by a closed, elastically designed bladder 12.
  • the gas is enclosed inside the bladder 12, which in the sense of the invention represents the separating element of the gas pressure accumulator.
  • the housing 10 has a connecting part 14 in the usual and therefore not described in more detail, via which the bladder accumulator can be connected to a fluid circuit (not shown), which can be open or closed.
  • the connecting part 14 forms in. essentially a hollow cylinder and the centrally located poppet valve 16 is formed from a non-magnetic material.
  • An energy store in the form of a compression spring 18 is supported with one end on the lower part of the plate 20 of the poppet valve 16 as seen in the figure and with its other end on a hollow sleeve 22 which is arranged centrally in the connecting part 14 and as part of the same.
  • the connecting part (not shown) connecting the hollow sleeve 22 to the connecting part 14 is pierced by at least two longitudinal bores 24, which produce a possible connection of the fluid side of the bladder accumulator shown to the fluid circuit, not shown.
  • the valve rod 26 of the poppet valve 16 is guided so as to be longitudinally displaceable in the direction of the longitudinal axis 28 of the bladder accumulator and connected at one end to the plate 20, whereas it has a socket-like non-magnetic switching element carrier 30 at its other end, on which and a permanent magnet in the form of a ring is mounted without pressure as the switching element 32.
  • the switching element carrier 30 With its flange-like extension 34, when the valve position of the poppet valve 16 is correspondingly wide open, the switching element carrier 30 can be inserted into a recess in the Intervene hollow sleeve 22 and together with this form a stop for the poppet valve 16 in its fully open position.
  • the permanent magnet 32 arranged on the flange base 36 has an axial distance from the underside of the hollow sleeve 22 in this contact position, as is shown in particular in the left half of the figure, and therefore does not come into contact with the latter.
  • the switching element 32 is part of a monitoring device for the position of the poppet valve 16, the switching element 32 cooperating with another part of the monitoring device in the form of a sensor 38 which can be screwed into the connecting part 14 and whose housing is likewise made of a non-magnetic material.
  • the sensor 38 is a so-called reed or Hall sensor, which is formed from a switch which can be actuated by means of the magnet 32 or uses the Hall effect. Such sensors are freely available on the market and are therefore not described in more detail here.
  • the switching element 32 can also be formed from a cam which interacts with a fixed switch (not shown) which can be actuated in this way.
  • the sensor 38 does not need to be arranged laterally from the direction of travel of the poppet valve 16 on the connecting part 14, but rather can be seen in the direction of travel of the poppet valve 16, that is to say in the direction of the longitudinal axis 28, in the figure below Switch member carrier 30 are located, it being important to ensure that, even when the poppet valve 16 is completely closed, viewed in the direction of the longitudinal axis 28, there is an axial distance from the sensor arranged in this way (not shown) remains.
  • the switching element as seen in the figure, is then arranged below the switching element carrier and is fixedly connected to the latter, for example via a retaining screw (not shown).
  • a commercially available pressure transducer 40 is screwed into the connection part 14, by means of which the fluid pressure prevailing in the connection part 14 can be determined on the fluid side.
  • Sensor 38 and pressure transducer 40 both have corresponding electrical connections 42, by means of which they can be connected to a computer unit (not shown) which controls the sensor 38 and the pressure transducer 40 for a measurement process and which carries out the measurement value evaluation.
  • the accumulator bladder 12 Before the bladder accumulator is delivered to the customer and thus before it is connected to the fluid circuit, the accumulator bladder 12 is filled with gas of a preselectable pressure setpoint, which is set, via a gas valve (not shown) which is arranged on the end of the housing 10 opposite the poppet valve 16 also referred to as gas bias of the bladder accumulator.
  • the bladder 12 thus biased with gas then fills the steel container 10 completely and closes the poppet valve 16, so that the plate 20 is in sealing contact with the upper end of the connecting part 14, as seen in the figure, against the direction of force of the compression spring 18.
  • the poppet valve 16 thus prevents the storage bladder 12 from escaping from the interior of the housing 10 and, moreover, protects it from damage.
  • the valve opens, which is shown in the left half of the figure.
  • the fluid flows into the interior of the reservoir and compresses the nitrogen in the reservoir bladder 12.
  • the gas volume in the bladder 12 is reduced by the volume of liquid taken up.
  • the reservoir bladder 12 becomes larger and, for example, assumes the right position as seen in the figure. In this position, the poppet valve 16 is almost closed and the storage bladder 12 largely assumes a position as it holds when it is originally charged with the pressure setpoint or the gas bias, with which the poppet valve 16 is in the closed position.
  • the switching element 32 and the sensor 38 are now arranged with respect to one another such that, immediately before the poppet valve 16 has reached the closed position, the pressure sensor 40 can detect the pressure value as it prevails in the connecting part 14 on the fluid side.
  • the switching element 32 actuates the sensor 38 and this in turn actuates the pressure sensor 40 for a measurement by means of the computing unit (not shown).
  • the fluid-side system pressure has largely dropped, because otherwise the poppet valve 16 could not close and the actual gas pressure actually prevailing in the storage bladder 12 can be detected directly via the pressure transducer 40, since the system pressure and gas pressure are coupled to one another without loss at least shortly before the poppet valve 16 closes .
  • the gas pressure actual value prevailing within the storage bladder 12 will be slightly larger in the measuring position, as shown on the right in the figure, even in gas-free operation, as may initially be the case, when the poppet valve 16 is completely closed; a position which can be assigned to the actual gas pressure setpoint, but which cannot be used for a measurement because of the associated interruption of the fluid connection between the interior of the housing 10 and the connecting part 14.
  • This slight difference between the pressure setpoint when the valve 16 is closed and the "fictitious" pressure setpoint shortly before the valve 16 closes can be compensated for by means of the computing unit, which knows the assignable gas pressure setpoint for the storage bladder 12 in the measurement position from comparative measurements and at one If the pressure falls below this "fictitious" pressure setpoint, a refilling process is automatically initiated.
  • a "fictitious" pressure setpoint can be assigned to this position, which can be converted to the originally prevailing gas prestress and which, after the actual gas pressure actual value has been recorded, by means of the pressure transducer 40 if necessary, starts a refill process.
  • the pressure measurement of the pressure transducer 40 will always take place with the valve plate in the same position or the associated position of the storage bladder 12 to avoid measurement errors, the most accurate measurement results being achievable shortly before the valve plate 20 strikes the connection part 14. With the relevant method, a pressure increase above the pressure setpoint would also be ascertainable and corrected.
  • the temperature value prevailing during the respective measurement could also be detected, so that the computer would be able to adjust the pressure values prevailing at this temperature to those pressure values convert to achieve the original filling of the bladder accumulator the gas preload can be measured with the prevailing temperature. Measurement errors due to temperature fluctuations can be excluded.
  • the switching element attached to the poppet valve could also be attached directly to the separating element, for example on or in the piston of a piston accumulator, which could then cooperate with a sensor which is attached outside the accumulator housing.
  • a complete gas loss in the bladder can also be detected, as can occur in the case of a crack in the bladder skin, because the poppet valve then no longer closes, which the monitoring device recognizes.

Abstract

PCT No. PCT/EP92/01047 Sec. 371 Date Sep. 22, 1993 Sec. 102(e) Date Sep. 22, 1993 PCT Filed May 13, 1992 PCT Pub. No. WO92/21012 PCT Pub. Date Nov. 26, 1992.Pressure of a gas in a gas accumulator coupled to a fluid circuit is measured in a system involving separating gas from pressure fluid in a gas accumulator by a separating element, measuring pressure of the pressure fluid with a pressure detector coupled to the gas accumulator when the separating element is in a preadjustable position having a gas pressure assignable to it, detecting the preadjustable position by a monitor coupled to the pressure detector, and initiating measurement of the fluid pressure upon detection of the separating element in the preadjustable position.

Description

Die Erfindung betrifft ein Verfahren zum Messen des Druckes eines Gases in einem Gasdruckspeicher, der an einen Fluidkreislauf angeschlossen ist, der einen Druckwertaufnehmer aufweist und bei dem das Gas über ein Trennelement von dem Fluid getrennt ist, sowie einen Gasdruckspeicher zum Durchführen dieses Verfahrens.The invention relates to a method for measuring the pressure of a gas in a gas pressure accumulator, which is connected to a fluid circuit, which has a pressure transducer and in which the gas is separated from the fluid via a separating element, and to a gas pressure accumulator for performing this method.

Gasdruckspeicher, wie Kolbenspeicher, Membranspeicher oder Blasenspeicher, weisen vor ihrem Anschluß an den jeweiligen Fluidkreislauf auf der Gasseite einen vorgebbaren Druck-Sollwert auf, den man auch als die Gasvorspannung des Speichers bezeichnet.Gas pressure accumulators, such as piston accumulators, membrane accumulators or bladder accumulators, have a preselectable pressure setpoint on their connection to the respective fluid circuit, which is also referred to as the gas preload of the accumulator.

Bei dahingehenden Speichern ist es nun notwendig, die Gasvorspannung, die zum bestimmungsgemäßen Betrieb erforderlich ist, in gewissen zeitlichen Abständen zu kontrollieren, da in Abhängigkeit von der Betriebsweise des Speichers mit gewissen Gasverlusten zu rechnen ist. Hierzu ist es bisher üblich gewesen, den Fluidkreislauf mit dem jeweils angeschlossenen Speicher drucklos zu machen, jedenfalls zumindest den Teil der Anlage, die dem Speicher betrifft, um dann in diesem drucklosen Zustand den Druck-Sollwert bzw. den Gasvorspannungsdruck des in dem Speicher befindlichen Gases, meist in Form von Stickstoffgas, zu überprüfen und gegebenenfalls nachzufüllen. Zur Durchführung dieses bekannten Verfahrens wird auf der Gasseite eine Füll- und Prüfvorrichtung auf den Speicher aufgesetzt, mit der mittels eines Manometers der tatsächlich auf der Gasseite herrschende Druck-Istwert gemessen wird. Unterschreitet dieser DruckIstwert den Wert der Gasvorspannung, wird mittels der Füllvorrichtung der Speicher befüllt und dieser Füllvorgang mittels des Manometers überwacht. Die dahingehende Vorgehensweise ist zeitintensiv und der Speicher samt dem dazugehörigen Teil des Fluidkreislaufes nicht betriebsbereit.In the case of this type of storage, it is now necessary to check the gas preload required for the intended operation at certain time intervals, since certain gas losses can be expected depending on the operating mode of the storage. For this purpose, it has previously been customary to depressurize the fluid circuit with the respectively connected accumulator, at least at least the part of the system that relates to the accumulator, and then, in this depressurized state, the pressure setpoint or the gas bias pressure of the gas in the accumulator , mostly in the form of nitrogen gas, to be checked and topped up if necessary. To carry out this known method, a filling and testing device is placed on the memory on the gas side, with which the actual pressure actually prevailing on the gas side is measured by means of a manometer. If this actual pressure value falls below the value of the gas preload, the storage device is filled using the filling device and this filling process is monitored using the manometer. The procedure in question is time-consuming and the memory and the associated part of the fluid circuit are not ready for operation.

Bei einem gattungsgemäßen Verfahren zum Messen des Druckes eines Gases in einem Gasdruckspeicher gemäß der JP-A-1-73232 wird eine Druck-Meßkurve über der Zeit erstellt, bei der zunächst der Flüssigkeitsdruck geradlinig sehr stark ansteigt, um anschließend mit zunehmender Meßzeit in eine sanft ansteigende Kurve überzugehen. Es hat sich gezeigt, daß an der Stelle des Überganges zwischen dem linearen und dem kurvenförmigen Meßdruckverlauf der Gasdruck in der Speicherblase gerade dem an dieser Stelle gemessenen Fluiddruck entspricht. Um die Meßzeit abzukürzen, wird bei dem bekannten Verfahren angegeben, eine Messung nur in dem Zeitintervall oder innerhalb desjenigen "Fensters" vorzunehmen, in dem man erfahrungsgemäß die angesprochene Knickstelle innerhalb der Meßkurve erwartet. Durch die JP-A-1-54325, die ein vergleichbares, gattungsgemäßes Verfahren offenbart, ist es bekannt, mittels einer Zeitmeßeinrichtung die angesprochene Messung in vorgebbaren regelmäßigen Zeitabständen durchzuführen.In a generic method for measuring the pressure of a gas in a gas pressure accumulator according to JP-A-1-73232, a pressure measurement curve is created over time, in which the liquid pressure initially increases very strongly in a straight line, and then gradually increases to a gentle one with increasing measurement time to pass the rising curve. It has been shown that at the point of the transition between the linear and the curved measurement pressure curve, the gas pressure in the storage bladder corresponds exactly to the fluid pressure measured at this point. In order to shorten the measuring time, the known method specifies that a measurement should only be carried out in the time interval or within the “window” in which experience has shown that the kink point mentioned is expected within the measuring curve. From JP-A-1-54325, which discloses a comparable, generic method, it is known to carry out the mentioned measurement at predeterminable regular time intervals by means of a time measuring device.

Über diese automatisch oder manuell vorgenommenen Erfassungsverfahren zum Messen des Gasschließdruckes läßt sich auch feststellen, ob es bei dem hydropneumatischen Speicher zu Gasverlusten kommt. Liegt jedoch der zu erfassende Gasdruck aufgrund von größeren Gasverlusten außerhalb des vorgegebenen Meßwertbereiches in Form des "Fensters" oder liegt gar ein gasseitiger Speicherdefekt mit vollständiger Gasentleerung vor, läßt sich mit diesem bekannten Meßverfahren nicht feststellen, ob es tatsächlich zu Gasverlusten gekommen ist bzw. ob ein Speicherdefekt vorliegt oder ob die Meßeinrichtung nicht zuverlässig arbeitet. Zwar kann man, um diesen Nachteil der bekannten Verfahren zu beseitigen, grundsätzlich einen vollständigen Meßzyklus (größer als 20 Sek.) durchführen und anschließend die Meßkurve entsprechend auswerten, wozu man in der Regel eine Rechnereinheit unbedingt benötigen wird; ein schnelles Abschalten beispielsweise in Sicherheitsbereichen, wie Kernkraftwerken od.dgl., des zum jeweiligen Gasdruckspeicher zugehörigen Fluidkreislaufes ist dann aber keinesfalls mehr gewährleistet.These automatic or manual detection methods for measuring the gas closing pressure can also be used to determine whether there is gas loss in the hydropneumatic accumulator. However, if the gas pressure to be recorded is due to larger gas losses outside the specified measurement range in the form of the "window" or there is even a gas-side storage defect with complete gas emptying, this known measuring method cannot be used to determine whether gas losses have actually occurred or not there is a memory defect or whether the measuring device is not working reliably. In order to eliminate this disadvantage of the known methods, it is in principle possible to carry out a complete measurement cycle (greater than 20 seconds) and then to evaluate the measurement curve accordingly, for which a computer unit is generally absolutely necessary; A rapid shutdown of the fluid circuit associated with the respective gas pressure accumulator, such as in nuclear power plants or the like, is no longer guaranteed.

Ausgehend von diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren sowie einen Gasdruckspeicher zum Durchführen dieses Verfahrens zu schaffen, die eine Überprüfung der Gasvorspannung erlauben, ohne daß die Einsatzbereitschaft des zugehörigen Fluidkreislaufes beeinträchtigt ist und die eine genaue und schnelle Meßwerterfassung ermöglichen, selbst wenn der jeweilige Gasdruckspeicher durch Materialversagen von der Gasseite her ausfällt. Diese Aufgabe löst ein Verfahren mit den Merkmalen des Anspruches 1 bzw. ein Gasdruckspeicher mit den Merkmalen des Anspruches 2.On the basis of this prior art, the object of the invention is to create a method and a gas pressure accumulator for carrying out this method which allow the gas pretension to be checked without the operational readiness of the associated fluid circuit being impaired and which enable accurate and rapid measurement value acquisition, even if the respective gas pressure accumulator fails from the gas side due to material failure. This object is achieved by a method having the features of claim 1 and a gas pressure accumulator having the features of claim 2.

Gemäß dem kennzeichnenden Teil des Anspruches 1 wird bei einer vorgebbaren Lage des Trennelementes der ihm in dieser Lage zuordenbare Gasdruck mittels des Druckwertaufnehmers gemessen und das Einnehmen dieser vorgebbaren Lage mittels einer Überwachungseinrichtung festgestellt, die die Meßwertaufnahme mittels des Druckwertaufnehmers veranlaßt. Die vorgebbare Lage des Trennelementes, das aus einem Kolben, einer Membran oder einer Blase bestehen kann, ist derart gewählt, daß man den dazu zuordenbaren Gasdruck, beispielsweise durch Versuchsmessungen ermittelt, kennt. Dieser zuordenbare Gasdruck läßt sich durch den fluidseitig angeordneten Druckwertaufnehmer messen und ins Verhältnis zu dem gewünschten Gasdruck-Sollwert bzw. der Gasvorspannung setzen. Bei einem Unterschreiten dieses letztgenannten Wertes durch den Gasdruck-Istwert ist der Gasdruckspeicher mittels der angesprochenen Füllvorrichtung erneut befüllbar. Mit der angesprochenen Vorgehensweise ist eine kontinuierliche Überwachung des Speichers möglich und die Einsatzbereitschaft des Fluidkreislaufes nicht beeinträchtigt.According to the characterizing part of claim 1, in the case of a predeterminable position of the separating element, the gas pressure which can be assigned to it in this position is measured by means of the pressure transducer and the assumption of this predefinable position is determined by means of a monitoring device which causes the measured value to be recorded by means of the pressure transducer. The predeterminable position of the separating element, which can consist of a piston, a membrane or a bladder, is selected in such a way that the gas pressure that can be assigned to it is known, for example ascertained by experimental measurements. This assignable gas pressure can be measured by the pressure sensor arranged on the fluid side and set in relation to the desired gas pressure setpoint or the gas preload. If the gas pressure actual value falls below this latter value, the gas pressure accumulator can be refilled using the mentioned filling device. With the approach mentioned, the storage can be continuously monitored and the operational readiness of the fluid circuit is not impaired.

Entgegen den bekannten Verfahren wird das Trennelement im Hinblick auf seine Lage überwacht und in der Art einer "punktuellen" Meßwerterfassung zu vorgegebenen Zeitpunkten auch außerhalb des Erwartungsbereiches liegende Gasvorspannungswerte des Gasdruckspeichers sicher erfaßt, so daß Fehlinterpretationen und Vermutungen, daß die Meßeinrichtung nicht zuverlässig arbeitet, weitestgehend vermieden sind. Dies gilt auch für den Fall, daß aufgrund eines Materialversagens der Gasdruckspeicher von der Gasseite her unbrauchbar wird. Durch die mögliche "punktuelle" Meßwerterfassung des damit einhergehenden Gasdruckvorspannungswertes läßt sich im sicherheitsrelevanten Bereich der Fluidkreis umgehend abschalten, ohne daß hierzu, wie bei den bisher bekannten Verfahren, aufwendige Meßkurven und Auswertungen erstellt werden müßten.Contrary to the known methods, the separating element is monitored with regard to its position and, in the manner of a "punctual" measurement value detection at predetermined times, gas detection values of the gas pressure accumulator lying outside the expected range are reliably detected, so that misinterpretations and assumptions that the measuring device is not reliable works, are largely avoided. This also applies in the event that the gas pressure accumulator becomes unusable from the gas side due to material failure. Due to the possible "selective" measurement value acquisition of the associated gas pressure preload value, the fluid circuit in the safety-relevant area can be switched off immediately without the need for complex measurement curves and evaluations, as in the previously known methods.

Der erfindungsgemäße Gasdruckspeicher mit den Merkmalen des Anspruches 2 verwirklicht das beschriebene erfindungsgemäße Verfahren, mit dem sich die Meßwertaufnahme und gegebenenfalls das Nachfüllen des Gasdruckspeichers automatisieren läßt.The gas pressure accumulator according to the invention with the features of claim 2 realizes the described method according to the invention, with which the recording of measured values and, if appropriate, the refilling of the gas pressure accumulator can be automated.

Weitere vorteilhafte Ausgestaltungen der erfindungsgemäßen Vorrichtung sind Gegenstand der Unteransprüche.Further advantageous embodiments of the device according to the invention are the subject of the dependent claims.

Im folgenden ist die Erfindung anhand der Zeichnung näher erläutert.The invention is explained in more detail below with reference to the drawing.

Es zeigt die einzige Figur den unteren Teil eines Blasenspeichers, wobei die dem Betrachter zugewandte linke Bildhälfte den Speicher in einer seiner Arbeitsstellungen und die rechte Bildhälfte in der Meßstellung wiedergibt.The sole figure shows the lower part of a bladder accumulator, the left half of the image facing the viewer representing the accumulator in one of its working positions and the right half in the measuring position.

Der Gasdruckspeicher in Form des Blasenspeichers gemäß der Zeichnung weist als Gehäuse 10 einen Stahlbehälter auf.The gas pressure accumulator in the form of the bladder accumulator according to the drawing has a steel container as the housing 10.

In dem Gehäuse 10 werden das Gas in Form von Stickstoff und die Druckflüssigkeit in Form von Hydrauliköl durch eine geschlossene elastisch ausgebildete Blase 12 voneinander getrennt. Hierbei ist das Gas im Inneren der Blase 12 eingeschlossen, die im Sinne der Erfindung das Trennelement des Gasdruckspeichers darstellt. An seinem in der Figur gesehen unteren Ende weist das Gehäuse 10 ein Anschlußteil 14 in üblicher und daher nicht näher beschriebener Weise auf, über das der Blasenspeicher an einen Fluidkreislauf (nicht dargestellt) anschließbar ist, der offen oder geschlossen sein kann.In the housing 10, the gas in the form of nitrogen and the pressure fluid in the form of hydraulic oil are separated from one another by a closed, elastically designed bladder 12. Here, the gas is enclosed inside the bladder 12, which in the sense of the invention represents the separating element of the gas pressure accumulator. At its lower end, as seen in the figure, the housing 10 has a connecting part 14 in the usual and therefore not described in more detail, via which the bladder accumulator can be connected to a fluid circuit (not shown), which can be open or closed.

Das Anschlußteil 14 bildet im. wesentlichen einen Hohlzylinder aus und das mittig in ihm geführte Tellerventil 16 ist aus einem nicht-magnetischen Werkstoff gebildet. Ein Kraftspeicher in Form einer Druckfeder 18 stützt sich mit seinem einen Ende an dem in der Figur gesehen unteren Teil des Tellers 20 des Tellerventiles 16 und mit seinem anderen Ende an einer Hohlbüchse 22 ab, die mittig im Anschlußteil 14 und als Bestandteil desselben angeordnet ist. Das die Hohlbüchse 22 mit dem Anschlußteil 14 verbindende Verbindungsteil (nicht dargestellt) ist von mindestens zwei Längsbohrungen 24 durchbrochen, die eine mögliche Verbindung der Fluidseite des gezeigten Blasenspeichers mit dem nicht dargestellten Fluidkreislauf herstellen.The connecting part 14 forms in. essentially a hollow cylinder and the centrally located poppet valve 16 is formed from a non-magnetic material. An energy store in the form of a compression spring 18 is supported with one end on the lower part of the plate 20 of the poppet valve 16 as seen in the figure and with its other end on a hollow sleeve 22 which is arranged centrally in the connecting part 14 and as part of the same. The connecting part (not shown) connecting the hollow sleeve 22 to the connecting part 14 is pierced by at least two longitudinal bores 24, which produce a possible connection of the fluid side of the bladder accumulator shown to the fluid circuit, not shown.

In der Hohlbüchse 22 ist die Ventilstange 26 des Tellerventiles 16 in Richtung der Längsachse 28 des Blasenspeichers längsverfahrbar geführt und an ihrem einen Ende mit dem Teller 20 verbunden, wohingegen sie an ihrem anderen Ende einen buchsenartigen nicht-magnetischen Schaltgliedträger 30 aufweist, auf dem stoß- und druckfrei als Schaltglied 32 ein Permanentmagnet in Form eines Ringes gelagert ist. Mit seinem flanschartigen Fortsatz 34 kann bei entsprechend weit geöffneter Ventilstellung des Tellerventiles 16 der Schaltgliedträger 30 in eine Ausnehmung der Hohlbüchse 22 eingreifen und mit dieser zusammen einen Anschlag für das Tellerventil 16 in seiner vollständig geöffneten Stellung bilden. Der auf dem Flanschsockel 36 angeordnete Permanentmagnet 32 weist in dieser Anlagestellung, wie dies insbesondere die linke Figurenhälfte zeigt, einen axialen Abstand zu der Unterseite der Hohlbüchse 22 auf und kommt mithin mit dieser nicht in Anlage.In the hollow sleeve 22, the valve rod 26 of the poppet valve 16 is guided so as to be longitudinally displaceable in the direction of the longitudinal axis 28 of the bladder accumulator and connected at one end to the plate 20, whereas it has a socket-like non-magnetic switching element carrier 30 at its other end, on which and a permanent magnet in the form of a ring is mounted without pressure as the switching element 32. With its flange-like extension 34, when the valve position of the poppet valve 16 is correspondingly wide open, the switching element carrier 30 can be inserted into a recess in the Intervene hollow sleeve 22 and together with this form a stop for the poppet valve 16 in its fully open position. The permanent magnet 32 arranged on the flange base 36 has an axial distance from the underside of the hollow sleeve 22 in this contact position, as is shown in particular in the left half of the figure, and therefore does not come into contact with the latter.

Das Schaltglied 32 ist Teil einer Überwachungseinrichtung für die Position des Tellerventiles 16, wobei das Schaltglied 32 mit einem anderen Teil der Überwachungseinrichtung in Form eines in das Anschlußteil 14 einschraubbaren Sensors 38 zusammenwirkt, dessen Gehäuse ebenfalls aus einem nicht-magnetischen Werkstoff gebildet ist. Bei dem Sensor 38 handelt es sich um einen sogenannten Reed- oder Hallsensor, der aus einem mittels des Magneten 32 betätigbaren Schalter gebildet ist bzw. den Halleffekt ausnutzt. Dahingehende Sensoren sind auf dem Markt frei erhältlich und werden daher an dieser Stelle nicht mehr näher beschrieben.The switching element 32 is part of a monitoring device for the position of the poppet valve 16, the switching element 32 cooperating with another part of the monitoring device in the form of a sensor 38 which can be screwed into the connecting part 14 and whose housing is likewise made of a non-magnetic material. The sensor 38 is a so-called reed or Hall sensor, which is formed from a switch which can be actuated by means of the magnet 32 or uses the Hall effect. Such sensors are freely available on the market and are therefore not described in more detail here.

Dank der derart ausgebildeten Überwachungseinrichtung ist ein berührungsloses und damit verlustfreies Erfassen der Lage des Tellerventiles 16 und wie noch gezeigt werden wird der Blase 12 möglich. Das Schaltglied 32 kann aber auch aus einem Nocken gebildet sein, der mit einem feststehenden derart betätigbaren Schalter (nicht dargestellt) zusammenwirkt. Auch braucht der Sensor 38 nicht, wie in der Figur dargestellt, seitlich von der Verfahrrichtung des Tellerventiles 16 am Anschlußteil 14 angeordnet zu sein, sondern kann vielmehr in der Verfahrrichtung des Tellerventiles 16, also in Richtung der Längsachse 28, in der Figur gesehen unterhalb des Schaltgliedträgers 30 liegen, wobei darauf zu achten ist, daß auch bei vollständig geschlossenem Tellerventil 16 noch in Richtung der Längsachse 28 gesehen, ein axialer Abstand zu dem derart angeordneten Sensor (nicht dargestellt) verbleibt. Zweckmäßigerweise ist dann das Schaltglied in der Figur gesehen unterhalb des Schaltgliedträgers angeordnet und mit diesem beispielsweise über eine Halteschraube (nicht dargestellt) fest verbunden.Thanks to the monitoring device designed in this way, contactless and thus loss-free detection of the position of the poppet valve 16 and, as will be shown, the bladder 12 becomes possible. However, the switching element 32 can also be formed from a cam which interacts with a fixed switch (not shown) which can be actuated in this way. Also, as shown in the figure, the sensor 38 does not need to be arranged laterally from the direction of travel of the poppet valve 16 on the connecting part 14, but rather can be seen in the direction of travel of the poppet valve 16, that is to say in the direction of the longitudinal axis 28, in the figure below Switch member carrier 30 are located, it being important to ensure that, even when the poppet valve 16 is completely closed, viewed in the direction of the longitudinal axis 28, there is an axial distance from the sensor arranged in this way (not shown) remains. Expediently, the switching element, as seen in the figure, is then arranged below the switching element carrier and is fixedly connected to the latter, for example via a retaining screw (not shown).

Neben dem Sensor 38 und unterhalb desselben angeordnet ist in dem Anschlußteil 14 noch ein handelsüblicher Druckwertaufnehmer 40 eingeschraubt, mittels dem sich fluidseitig der jeweils im Anschlußteil 14 herrschende Fluiddruck bestimmen läßt. Sensor 38 und Druckwertaufnehmer 40 verfügen beide über entsprechende elektrische Anschlüsse 42, mittels denen sie an eine Rechnereinheit (nicht dargestellt) anschließbar sind, die den Sensor 38 und den Druckwertaufnehmer 40 für einen Meßvorgang ansteuert und die die Meßwert-Auswertung vornimmt.In addition to the sensor 38 and arranged below it, a commercially available pressure transducer 40 is screwed into the connection part 14, by means of which the fluid pressure prevailing in the connection part 14 can be determined on the fluid side. Sensor 38 and pressure transducer 40 both have corresponding electrical connections 42, by means of which they can be connected to a computer unit (not shown) which controls the sensor 38 and the pressure transducer 40 for a measurement process and which carries out the measurement value evaluation.

Zum besseren Verständnis wird anhand der oben erläuterten Vorrichtung das erfindungsgemäße Verfahren näher dargestellt. Vor Ausliefern des Blasenspeichers an den Abnehmer und damit vor Anschließen desselben an den Fluidkreislauf wird über ein Gasventil (nicht dargestellt), das an dem dem Tellerventil 16 gegenüberliegenden Ende des Gehäuses 10 angeordnet ist, die Speicherblase 12 mit Gas eines vorgebbaren DruckSollwertes befüllt, den man auch als Gasvorspannung des Blasenspeichers bezeichnet. Die derart mit Gas vorgespannte Speicherblase 12 füllt dann den Stahlbehälter 10 ganz aus und schließt das Tellerventil 16, so daß der Teller 20 entgegen der Kraftrichtung der Druckfeder 18 in dichtender Anlage mit dem in der Figur gesehen oberen Ende des Anschlußteiles 14 ist. Das Tellerventil 16 verhindert mithin ein Austreten der Speicherblase 12 aus dem Inneren des Gehäuses 10 und schützt sie im übrigen vor Beschädigung.For better understanding, the method according to the invention is illustrated in more detail with the aid of the device explained above. Before the bladder accumulator is delivered to the customer and thus before it is connected to the fluid circuit, the accumulator bladder 12 is filled with gas of a preselectable pressure setpoint, which is set, via a gas valve (not shown) which is arranged on the end of the housing 10 opposite the poppet valve 16 also referred to as gas bias of the bladder accumulator. The bladder 12 thus biased with gas then fills the steel container 10 completely and closes the poppet valve 16, so that the plate 20 is in sealing contact with the upper end of the connecting part 14, as seen in the figure, against the direction of force of the compression spring 18. The poppet valve 16 thus prevents the storage bladder 12 from escaping from the interior of the housing 10 and, moreover, protects it from damage.

Ist der Blasenspeicher an den Fluidkreislauf bzw. an das Hydrosystem angeschlossen und erreicht oder übersteigt der Druck des Fluids den Wert der vorgebbaren Gasvorspannung, dann öffnet das Ventil, was in der linken Bildhälfte der Figur dargestellt ist. Das Fluid fließt in das Innere des Speichers und komprimiert den Stickstoff in der Speicherblase 12. Das Gasvolumen in der Blase 12 verringert sich dabei um das aufgenommene Flüssigkeitsvolumen. Bei Flüssigkeitsentnahme aus dem Speicher wird die Speicherblase 12 wiederum größer und nimmt beispielsweise die in der Figur gesehen rechte Position ein. In dieser Stellung ist das Tellerventil 16 nahezu geschlossen und die Speicherblase 12 nimmt weitestgehend eine Stellung ein, wie sie sie innehat, wenn sie mit dem Druck-Sollwert bzw. der Gasvorspannung ursprünglich geladen wird, bei der sich das Tellerventil 16 in Schließstellung befindet.If the bladder accumulator is connected to the fluid circuit or to the hydraulic system and the pressure of the fluid reaches or exceeds the value of the preselectable gas prestress, then the valve opens, which is shown in the left half of the figure. The fluid flows into the interior of the reservoir and compresses the nitrogen in the reservoir bladder 12. The gas volume in the bladder 12 is reduced by the volume of liquid taken up. When liquid is withdrawn from the reservoir, the reservoir bladder 12 becomes larger and, for example, assumes the right position as seen in the figure. In this position, the poppet valve 16 is almost closed and the storage bladder 12 largely assumes a position as it holds when it is originally charged with the pressure setpoint or the gas bias, with which the poppet valve 16 is in the closed position.

Das Schaltglied 32 und der Sensor 38 sind nun derart zueinander angeordnet, daß unmittelbar vor Erreichen der Schließlage des Tellerventils 16 der Druckwertaufnehmer 40 den Druckwert erfassen kann, wie er fluidseitig im Anschlußteil 14 herrscht. In dieser Meßstellung, also unmittelbar vor dem Aufschlagen des Ventiltellers 20 auf seinem Sitz, betätigt das Schaltglied 32 den Sensor 38 und dieser wiederum mittels der Recheneinheit (nicht dargestellt) den Druckwertaufnehmer 40 für eine Messung. Bei dieser Messung ist der fluidseitige Systemdruck weitgehend abgefallen, denn ansonsten könnte das Tellerventil 16 nicht schließen und der in der Speicherblase 12 tatsächlich herrschende GasdruckIstwert ist unmittelbar über den Druckwertaufnehmer 40 erfaßbar, da Systemdruck und Gasdruck zumindest kurz vor Schließen des Tellerventiles 16 verlustfrei miteinander gekoppelt sind.The switching element 32 and the sensor 38 are now arranged with respect to one another such that, immediately before the poppet valve 16 has reached the closed position, the pressure sensor 40 can detect the pressure value as it prevails in the connecting part 14 on the fluid side. In this measuring position, that is to say immediately before the valve disk 20 hits its seat, the switching element 32 actuates the sensor 38 and this in turn actuates the pressure sensor 40 for a measurement by means of the computing unit (not shown). In this measurement, the fluid-side system pressure has largely dropped, because otherwise the poppet valve 16 could not close and the actual gas pressure actually prevailing in the storage bladder 12 can be detected directly via the pressure transducer 40, since the system pressure and gas pressure are coupled to one another without loss at least shortly before the poppet valve 16 closes .

Der innerhalb der Speicherblase 12 herrschende Gasdruck-Istwert wird in der Meßstellung, wie er in der Figur gesehen rechts dargestellt ist, auch bei einem gasverlustfreien Betrieb, wie er anfänglich gegeben sein mag, geringfügig größer sein als bei vollständig zugeschlagenem Tellerventil 16; einer Stellung, die dem eigentlichen Gasdruck-Sollwert zuzuordnen ist, die aber wegen der damit einhergehenden Unterbrechung der Fluidverbindung zwischen dem Inneren des Gehäuses 10 und dem Anschlußteil 14 für eine Messung nicht verwertbar ist. Dieser geringfügige Unterschied zwischen dem Druck-Sollwert bei geschlossenem Ventil 16 und dem "fiktiven" DruckSollwert kurz vor Schließen des Ventiles 16 ist aber mittels der Recheneinheit kompensierbar, die aus Vergleichsmessungen den zuordenbaren Gasdruck-Sollwert für die Speicherblase 12 in der Meßstellung kennt und bei einem etwaigen Unterschreiten dieses "fiktiven" Druck-Sollwertes einen Nachfüllvorgang automatisch veranlaßt.The gas pressure actual value prevailing within the storage bladder 12 will be slightly larger in the measuring position, as shown on the right in the figure, even in gas-free operation, as may initially be the case, when the poppet valve 16 is completely closed; a position which can be assigned to the actual gas pressure setpoint, but which cannot be used for a measurement because of the associated interruption of the fluid connection between the interior of the housing 10 and the connecting part 14. This slight difference between the pressure setpoint when the valve 16 is closed and the "fictitious" pressure setpoint shortly before the valve 16 closes can be compensated for by means of the computing unit, which knows the assignable gas pressure setpoint for the storage bladder 12 in the measurement position from comparative measurements and at one If the pressure falls below this "fictitious" pressure setpoint, a refilling process is automatically initiated.

Aus dem eben Gesagten wird deutlich, daß auch in einer anderen vorgebbaren Lage des Trennelementes sich dieser Lage ein "fiktiver" Druck-Sollwert zuordnen läßt, der auf die ursprünglich herrschende Gasvorspannung umrechenbar ist und der nach Erfassen des tatsächlichen Gasdruck-Istwertes mittels des Druckwertaufnehmers 40 gegebenenfalls einen Nachfüllvorgang in Gang setzt. Vorzugsweise wird aber die Druckmessung des Druckwertaufnehmers 40 zur Vermeidung von Meßfehlern immer bei gleicher Stellung des Ventiltellers bzw. der damit einhergehenden gleichen Stellung der Speicherblase 12 erfolgen, wobei die genauesten Meßergebnisse kurz vor dem Aufschlagen des Ventiltellers 20 auf dem Anschlußteil 14 erreichbar sind. Mit dem dahingehenden Verfahren würde sich auch eine Druckerhöhung über den Druck-Sollwert hinaus feststellen und korrigieren lassen.It is clear from what has just been said that even in another predeterminable position of the separating element, a "fictitious" pressure setpoint can be assigned to this position, which can be converted to the originally prevailing gas prestress and which, after the actual gas pressure actual value has been recorded, by means of the pressure transducer 40 if necessary, starts a refill process. Preferably, however, the pressure measurement of the pressure transducer 40 will always take place with the valve plate in the same position or the associated position of the storage bladder 12 to avoid measurement errors, the most accurate measurement results being achievable shortly before the valve plate 20 strikes the connection part 14. With the relevant method, a pressure increase above the pressure setpoint would also be ascertainable and corrected.

Mittels eines Temperaturfühlers (nicht dargestellt), der neben dem Druckwertaufnehmer 40 in dem Anschlußteil 14 anordenbar wäre, könnte der bei der jeweiligen Messung herrschende Temperaturwert mit erfaßt werden, so daß der Rechner in der Lage wäre, die bei dieser Temperatur herrschenden Druckwerte auf diejenigen Druckwerte umzurechnen, die bei dem ursprünglichen Befüllen des Blasenspeichers zum Erzielen der Gasvorspannung mit der dabei herrschenden Temperatur gemessen werden. Meßfehler aufgrund von Temperaturschwankungen können damit ausgeschlossen werden.By means of a temperature sensor (not shown), which could be arranged next to the pressure sensor 40 in the connection part 14, the temperature value prevailing during the respective measurement could also be detected, so that the computer would be able to adjust the pressure values prevailing at this temperature to those pressure values convert to achieve the original filling of the bladder accumulator the gas preload can be measured with the prevailing temperature. Measurement errors due to temperature fluctuations can be excluded.

Das an dem Tellerventil angebrachte Schaltglied könnte auch unmittelbar an dem Trennglied angebracht sein, beispielsweise an oder in dem Kolben eines Kolbenspeichers, der dann mit einem Sensor zusammenwirken könnte, der außerhalb des Speichergehäuses angebracht ist.The switching element attached to the poppet valve could also be attached directly to the separating element, for example on or in the piston of a piston accumulator, which could then cooperate with a sensor which is attached outside the accumulator housing.

Im übrigen ist mit dem erfindungsgemäßen Verfahren auch ein vollständiger Gasverlust in der Blase feststellbar, wie er bei einem Riß in der Blasenhaut auftreten kann, denn das Tellerventil schließt dann nicht mehr, was die Überwachungseinrichtung erkennt.Moreover, with the method according to the invention, a complete gas loss in the bladder can also be detected, as can occur in the case of a crack in the bladder skin, because the poppet valve then no longer closes, which the monitoring device recognizes.

Claims (8)

  1. Method for measurement of the pressure of a gas in a gas accumulator which is attached to a fluid circuit, which has a pressure detector 40 and in which the gas is separated from the fluid by a separating element 12, characterized in that with a preadjustable position of the separating element 12 the gas pressure assignable to it in this position is measured by means of the pressure detector 40 and that the detection of this preadjustable position is established by means of a monitoring device, which allows for detection of the measurement by means of the pressure detector 40.
  2. Gas accumulator which is attachable to a fluid circuit, which has a pressure detector 40 on the fluid side and in which the gas is separated from the fluid by a separating element 12, characterized in that the detection of a preadjustable position of the separating element 12 can be monitored by means of a monitoring device, and when it is attained the monitoring device allows measurement detection by means of the pressure detector 40.
  3. Device Gas accumulator as in Claim 2, characterized in that the gas accumulator a bubble accumulator is used, of which the poppet valve 16 forms a part of the monitoring device and of which the attachment part 14, which is provided for attachment to the fluid circuit, includes the pressure detector 40.
  4. Device Gas accumulator as in Claim 3, characterized in that the part of the monitoring device of the poppet valve 16 has a connecting device 32, which cooperates with a part of the monitoring device in the form of a sensor 38 arranged on the attachment part 14.
  5. Device Gas accumulator as in Claim 4, characterized in that the connecting device 32 is formed of a magnet and the sensor 38 is formed of a switch which is operated by the magnet or utilizes the Hall effect.
  6. Device Gas accumulator as in Claim 4 or 5, characterized in that the sensor 38 is arranged in the direction of movement of the poppet valve 16 or on the attachment part 14 to the side of it.
  7. Device Gas accumulator as in one of the Claims 4 to 6, characterized in that the connecting device 32 and the sensor 38 are arranged relative to one another in such a manner that the pressure detector 40 detects the pressure level directly before the poppet valve 16 reaches closed position.
  8. Device Gas accumulator as in one of the Claim 2 to 7, characterized in that this device has at least one temperature sensor.
EP92909795A 1991-05-21 1992-05-13 Method of measuring the pressure of a gas in a gas accumulator, and a device for carrying out the method Expired - Lifetime EP0585280B1 (en)

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DE4116482A DE4116482A1 (en) 1991-05-21 1991-05-21 METHOD FOR MEASURING THE PRESSURE OF A GAS IN A GAS PRESSURE STORAGE AND DEVICE FOR CARRYING OUT THE SAME
DE4116482 1991-05-21
PCT/EP1992/001047 WO1992021012A1 (en) 1991-05-21 1992-05-13 Method of measuring the pressure of a gas in a gas accumulator, and a device for carrying out the method

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EP0585280B1 true EP0585280B1 (en) 1994-10-26

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EP0585280A1 (en) 1994-03-09
AU1694592A (en) 1992-12-30
DE59200704D1 (en) 1994-12-01
AU655020B2 (en) 1994-12-01
JPH06507696A (en) 1994-09-01
DK0585280T3 (en) 1995-04-24
WO1992021012A1 (en) 1992-11-26
US5445034A (en) 1995-08-29
ES2063583T3 (en) 1995-01-01
FI935101A0 (en) 1993-11-17
FI935101A (en) 1993-11-17
DE4116482A1 (en) 1992-11-26
ATE113377T1 (en) 1994-11-15

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