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EP1171715B1 - Method for monitoring the gas prefill pressure in hydraulic accumulators - Google Patents

Method for monitoring the gas prefill pressure in hydraulic accumulators Download PDF

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Publication number
EP1171715B1
EP1171715B1 EP00912645A EP00912645A EP1171715B1 EP 1171715 B1 EP1171715 B1 EP 1171715B1 EP 00912645 A EP00912645 A EP 00912645A EP 00912645 A EP00912645 A EP 00912645A EP 1171715 B1 EP1171715 B1 EP 1171715B1
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EP
European Patent Office
Prior art keywords
temperature
gas
pressure
store
hydro
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP00912645A
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German (de)
French (fr)
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EP1171715A1 (en
Inventor
Otmar SCHÖN
Klaus Goebbels
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Hydac Technology GmbH
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Hydac Technology GmbH
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Publication of EP1171715A1 publication Critical patent/EP1171715A1/en
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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
    • 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
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • 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
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • 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
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/51—Pressure detection

Definitions

  • the invention relates to a method for monitoring the gas pre-charge pressure in hydraulic accumulators according to the feature configuration of the preamble of claim 1.
  • a measuring and monitoring system for hydraulic accumulator is known, which is connected to the gas space of the hydraulic accumulator via two sensors.
  • the known solution is characterized in that in addition to a temperature sensor, a pressure sensor is used and Meßwertverschreibr are available for the preparation of the measured value signals. Furthermore, digital circuits for signal transmission, such as multiplexer, A / D converter, interface and a microcomputer for processing the measurement signals and the state variables of the hydraulic system are provided.
  • the gas temperature and the gas pressure are measured until the time of the achieved after emptying temperature compensation to wait for a precise measurement of Vor collldruckes first the stabilization of the temperature.
  • the pertinent solution leaves nothing to be desired regarding the simplest possible monitoring with high monitoring accuracy.
  • the invention has for its object to provide a method that allows a contrast significantly simplified monitoring with high monitoring accuracy even with built-in hard to reach places hydraulic accumulators.
  • this object is achieved in that the gas temperature and the gas pressure to be measured at the time of the achieved after emptying temperature compensation that telemetry for triggering the measurement, a control command is issued, that the gas temperature or the gas pressure related data are transmitted telemetrically to the spatially remote evaluation and that to determine the gas temperature at temperature compensation the temperature of the gas side of the hydraulic accumulator and at the same time the temperature is measured at a spatially separated from the hydraulic accumulator pressure gauge port at which the gas pressure is determined.
  • the inventively provided telemetric data transmission a system is created, which makes it possible to perform from a central control room from the monitoring of Vor collltikes with the least possible time and personnel.
  • the inventive method allows a quick and easy monitoring even in cases where memory are placed inaccessible within complex systems.
  • Advantageous fields of application are storage and storage facilities in metallurgical and rolling mill plants, in power plants or, for example, in machine shops with several plants.
  • the monitoring operations can be carried out at short intervals, which is particularly advantageous when it comes to hydraulic accumulators that are to fulfill safety functions. Since the achievement of temperature compensation after emptying memory is considered in the data transmission, also the aspired high accuracy of the monitoring is ensured.
  • the telemetric data transmission can take place via radio, via measuring line, via the telephone network or, using suitable modulation methods, for example via the electrical supply network.
  • a modem which is to be monitored at each one modem, which is provided at each monitored hydraulic accumulator for the telemetric transmission of data to the evaluation device, temperature value and pressure value signals supplied by transducers, the temperature meters and the pressure gauge on Manometer connection of the hydraulic accumulator are assigned.
  • the temperature value and pressure value signals via the modem of the relevant hydraulic accumulator telemetrically transmitted without further processing to the evaluation, where the corresponding computer program is performed to calculate from current temperature and pressure value corresponding to a reference temperature actual value of the gas pre-filling.
  • This calculation can alternatively also already be made on the relevant hydraulic accumulator by means of an additional computer unit assigned to the modem, so that only the actual value of the gas pre-charge pressure is transmitted to the evaluation device for further display, for example as a visual display and / or alarm or the like.
  • a hydraulic accumulator 1 in the form of a bladder accumulator with a gas side 3 and an oil side 5.
  • the method according to the invention can also be carried out with a diaphragm accumulator or piston accumulator in basically the same way.
  • a temperature meter 7 For measuring the gas temperature within the Gas side 3 of the hydraulic accumulator 1 is connected to this directly a temperature meter 7 with associated transducer 9 for converting the temperature values into electrical measurement signals.
  • a line leads to a pressure gauge connection 11 to which both a pressure gauge 13 and a second temperature gauge 15 are connected.
  • Pressure gauges 13 and temperature gauges 15 each have an associated transducer 17 or 19 for converting the measured values into corresponding electrical measuring signals.
  • a safety and shut-off block 23 is connected via a line 21, which forms the connection between the memory port S on the line 21 and the pressure port P and the tank port T.
  • a pressure relief valve 27 and an electromagnetically controllable two-way valve 29 which allows connection of the oil side 5 of the hydraulic accumulator 1 via the line 21 and the memory port S to the tank port T of the safety and shut-off block 23 when the oil valve, not shown in the drawing on the hydraulic accumulator 1 is in the open state.
  • a for monitoring the open or closed position of this preferably designed as a poppet valve oil valve monitoring device is indicated in Fig. 1 with 31 and provides via a transducer 33, a corresponding monitoring signal.
  • the pressure port P of the safety and shut-off block 23 is connected via an electromagnetically actuated directional control valve with the consumer line 37 in connection to which a motor and pump unit 39 is connected.
  • Lines leading from the tank connection T of the safety and shut-off block 23 and the directional control valve 35 to the tank 41 are designated 43 and 45, respectively.
  • a provided for measuring the pressure of the oil side 5 of the hydraulic accumulator 1, the pressure gauge port M of the safety and Absperrblockes 23 connected pressure gauge 47 has a transducer 49 for generating a corresponding electrical measurement signal.
  • the measuring signals of the transducers 9, 17, 19 and 49, as well as the monitoring signal of the transducer 33 are supplied to a modem 50 which forms part of a telemetry device, by means of which a data transmission to a designated in Fig. 2 as a whole by 51 evaluation and out of the Evaluation device 51 to the modem 50 out.
  • the evaluation device 51 includes a modem 53, a computer unit 55 and a display device 57.
  • the modems 50 and 53 depending on whether the data transmission is wired or wireless, suitable for the respective transmission method modulator and demodulator and optionally transmitting and receiving devices , as is known in telemetry systems per se.
  • the modem 50 telemetrically receives a control command that causes the modem 50 control signals S 1 and S 2 are delivered to the solenoid of the directional control valve 35 and the solenoid of the directional valve 29 to the pressure supply to the oil side 5 of the hydraulic accumulator. 1 to interrupt and to empty this via the line 21 via the directional control valve 29 to the tank 41.
  • the emptying which is indicated by the fact that the pressure gauge 47 detects pressure and this is signaled via the transducer 49 as a signal E 5
  • the monitoring device 31 via the transducer 33 with the monitoring signal E 4 signals that the previously opened Oil valve is closed on the hydraulic accumulator 1, carried the gas side temperature and pressure measurements.
  • a temperature compensation ie when the occurred by the emptying process of the memory temperature changes are compensated for temperature measurements simultaneously both by means of the temperature meter 7 directly on the gas side 3 and by means of temperature meter 15 carried out at the spatially distanced pressure gauge port 11 until the signals generated via the associated transducers 9 and 19 E 3 and E 2 signal by agreement the compensation.
  • the current gas pressure is simultaneously determined by the pressure gauge 13 via a connection adapter 11 and fed via the associated transducer 17 as a measuring signal E 1 to the modem 50.
  • this calculation can be done by applying the equation of state for real gases according to E. Bender, see S. Rott Reifen "method for calculating and investigation hydro-pneumatic storage", published dissertation of the Faculty of Mechanical Engineering of the RWTH Aachen University.
  • the values calculated by the computer unit 55 of the evaluation device 51 as a function of the measurement signals E 1 , E 2 and E 3 are supplied as display values A to the display device 57 in order to be displayed visually and depending on the application and needs specifically analyzed and, for example, by printing, to be documented.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Measuring Fluid Pressure (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

A method monitors the gas prefill pressure in hydraulic accumulators. After the pressure supply to the oil side of the accumulator has been interrupted and the contents of the tank have been emptied, the current gas temperature and the current gas pressure are determined, once the temperature has equalized. The data relating to the gas temperature and pressure is telemetrically transmitted to an evaluation unit, which is spatially located at a distance, to calculate an actual value of the gas prefill pressure which corresponds to a reference temperature.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Überwachung des Gas-Vorfülldruckes bei Hydrospeichern gemäß der Merkmalsausgestaltung des Oberbegriffes des Patentanspruches 1.The invention relates to a method for monitoring the gas pre-charge pressure in hydraulic accumulators according to the feature configuration of the preamble of claim 1.

Da die Betriebseigenschaften von Hydrospeichern wesentlich vom gewählten Vorfülldruck bestimmt sind, ist es für einen einwandfreien und sicheren Betrieb von Speichern und Speicheranlagen äußerst wichtig, daß eine Überwachung auch in zwischen den üblichen Wartungsintervallen liegenden kürzeren Zeitabschnitten durchgeführt wird, um festzustellen, ob Konstanz des Vorfülldruckes innerhalb akzeptabler Toleranzen vorliegt. Ein zu diesem Zweck durchzuführendes Überwachungsverfahren mit den vorstehend genannten Verfahrensschritten a) bis d) ist Stand der Technik (vgl. "Controle van hydro-accumulator" des niederländischen Artikels " Continue bewaking van de hydro-accumulator bespaart veel volgschade" von T. Van Dale aus "Polytechnisch Tijdschrift" S.38-41, vom März 1992 ).Since the operating characteristics of hydraulic accumulators are significantly determined by the selected Vorfülldruck, it is extremely important for a proper and safe operation of storage and storage facilities that monitoring is performed even in between the usual maintenance intervals shorter time periods to determine whether constancy of the Vorfülldruckes within acceptable tolerances. A monitoring method to be carried out for this purpose with the abovementioned method steps a) to d) is state of the art (see "Controle van hydro-accumulator" of the Dutch article) " Continue bewaking van de hydro-accumulator bespoke veel volgschade "by T. Van Dale from" Polytechnisch Tijdschrift "p.38-41, from March 1992 ).

Wird das bekannte Verfahren in üblicher Weise durchgeführt, ergeben sich längere Betriebsunterbrechungen sowie große Schwierigkeiten, insbesondere in solchen Fällen, wo eine größere Anzahl räumlich voneinander getrennter Speicher überwacht werden müssen, die an unzugänglichen Stellen in größeren Anlagen eingebaut sind.If the known method is carried out in the usual way, there are longer interruptions in operation and great difficulties, especially in those cases where a larger number of spatially separated memory must be monitored, which are installed in inaccessible places in larger systems.

Durch die DE 32 24 136 A ist ein Meß- und Überwachungssystem für Hydrospeicher bekannt, welches an den Gasraum des Hydrospeichers über zwei Sensoren angeschlossen ist. Die bekannte Lösung ist dadurch charakterisiert, daß neben einem Temperatursensor ein Drucksensor eingesetzt ist und Meßwertverstärker zur Verfügung stehen zur Aufbereitung der Meßwertsignale. Ferner sind digitale Schaltungen zur Signalübertragung, wie Multiplexer, A/D-Wandler, Interface sowie ein Mikrocomputer zu Verarbeitung der Meßsignale und der Zustandsgrößen der Hydraulikanlage vorgesehen. Bei der bekannten Lösung werden die Gastemperatur und der Gasdruck bis zum Zeitpunkt des nach der Entleerung erreichten Temperaturausgleichs gemessen, um für ein präzises Messen der Vorfülldruckes zunächst die Stabilisierung der Temperatur abzuwarten. Auch die dahingehende Lösung läßt noch Wünsche offen betreffend eine möglichst einfache Überwachung bei hoher Überwachungsgenauigkeit.By the DE 32 24 136 A a measuring and monitoring system for hydraulic accumulator is known, which is connected to the gas space of the hydraulic accumulator via two sensors. The known solution is characterized in that in addition to a temperature sensor, a pressure sensor is used and Meßwertverstärker are available for the preparation of the measured value signals. Furthermore, digital circuits for signal transmission, such as multiplexer, A / D converter, interface and a microcomputer for processing the measurement signals and the state variables of the hydraulic system are provided. In the known solution, the gas temperature and the gas pressure are measured until the time of the achieved after emptying temperature compensation to wait for a precise measurement of Vorfülldruckes first the stabilization of the temperature. The pertinent solution leaves nothing to be desired regarding the simplest possible monitoring with high monitoring accuracy.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, das eine demgegenüber wesentlich vereinfachte Überwachung mit hoher Überwachungsgenauigkeit auch bei an schwer erreichbaren Stellen eingebauten Hydrospeichern ermöglicht.The invention has for its object to provide a method that allows a contrast significantly simplified monitoring with high monitoring accuracy even with built-in hard to reach places hydraulic accumulators.

Bei einem Verfahren der eingangs genannten Art ist diese Aufgabe erfindungsgemäß dadurch gelöst, daß die Gastemperatur und der Gasdruck bis zum Zeitpunkt des nach der Entleerung erreichten Temperaturausgleichs gemessen werden, daß zum Auslösen des Meßvorganges telemetrisch ein Steuerbefehl erteilt wird, daß die auf die Gastemperatur bzw. den Gasdruck bezogenen Daten telemetrisch an die räumlich entfernt angeordnete Auswerteeinrichtung übermittelt werden und daß zur Ermittlung der Gastemperatur bei Temperaturausgleich die Temperatur der Gasseite des Hydrospeichers und gleichzeitig die Temperatur an einem vom Hydrospeicher räumlich getrennten Manometeranschluß gemessen wird, an dem der Gasdruck ermittelt wird.In a method of the type mentioned above, this object is achieved in that the gas temperature and the gas pressure to be measured at the time of the achieved after emptying temperature compensation that telemetry for triggering the measurement, a control command is issued, that the gas temperature or the gas pressure related data are transmitted telemetrically to the spatially remote evaluation and that to determine the gas temperature at temperature compensation the temperature of the gas side of the hydraulic accumulator and at the same time the temperature is measured at a spatially separated from the hydraulic accumulator pressure gauge port at which the gas pressure is determined.

Durch die erfindungsgemäß vorgesehene telemetrische Datenübermittlung ist ein System geschaffen, das es ermöglicht, von einer zentralen Meßwarte aus die Überwachung des Vorfülldruckes mit geringstmöglichem zeitlichem und personellem Aufwand durchzuführen. Das erfindungsgemäße Verfahren ermöglicht eine schnelle und einfache Überwachung selbst in den Fällen, wo Speicher innerhalb komplexer Anlagen unzugänglich aufgestellt sind. Vorteilhafte Anwendungsgebiete sind Speicher und Speicheranlagen in Hütten- und Walzwerkanlagen, in Kraftwerken oder beispielsweise in Maschinenhallen mit mehreren Anlagen. Durch die Vereinfachung der Überwachung lassen sich die Überwachungsvorgänge in kurzen Zeitabständen durchführen, was insbesondere vorteilhaft ist, wenn es sich um Hydrospeicher handelt, die Sicherheitsfunktionen erfüllen sollen. Da das Erreichen des Temperaturausgleichs nach Speicherentleerung bei der Datenübermittlung berücksichtigt wird, ist zudem die erstrebte hohe Genauigkeit der Überwachung gewährleistet.The inventively provided telemetric data transmission, a system is created, which makes it possible to perform from a central control room from the monitoring of Vorfülldruckes with the least possible time and personnel. The inventive method allows a quick and easy monitoring even in cases where memory are placed inaccessible within complex systems. Advantageous fields of application are storage and storage facilities in metallurgical and rolling mill plants, in power plants or, for example, in machine shops with several plants. By simplifying the monitoring, the monitoring operations can be carried out at short intervals, which is particularly advantageous when it comes to hydraulic accumulators that are to fulfill safety functions. Since the achievement of temperature compensation after emptying memory is considered in the data transmission, also the aspired high accuracy of the monitoring is ensured.

Die telemetrische Datenübermittlung kann über Funk, über Meßleitung, über das Telefonnetz oder, unter Anwendung geeigneter Modulationsverfahren, beispielsweise über das elektrische Versorgungsnetz erfolgen.The telemetric data transmission can take place via radio, via measuring line, via the telephone network or, using suitable modulation methods, for example via the electrical supply network.

Erfindungsgemäß werden einem Modem, das an jedem zu überwachenden werden einem Modem, das an jedem zu überwachenden Hydrospeicher für die telemetrische Übermittlung von Daten zur Auswerteeinrichtung vorgesehen ist, Temperaturwert- und Druckwertsignale zugeführt, die von Meßwandlern erzeugt sind, die den Temperaturmessern und dem Druckmesser am Manometeranschluß des Hydrospeichers zugeordnet sind. Vorzugsweise werden die Temperaturwert- und Druckwertsignale über das Modem des betreffenden Hydrospeichers ohne weitere Verarbeitung telemetrisch zur Auswerteeinrichtung übertragen, wo das entsprechende Rechenprogramm durchgeführt wird, um aus aktuellem Temperatur- und Druckwert den einer Bezugstemperatur entsprechenden Istwert des Gas-Vorfülldruckes zu berechnen. Diese Berechnung kann alternativ auch bereits am betreffenden Hydrospeicher mittels einer dem Modem zugeordneten Zusatz-Rechnereinheit vorgenommen werden, so daß lediglich der Istwert des Gas-Vorfülldruckes auf die Auswerteeinrichtung zur weiteren Darstellung, beispielsweise als Sichtanzeige und/oder zur Alarmgabe oder dergleichen übertragen wird.According to the invention, a modem, which is to be monitored at each one modem, which is provided at each monitored hydraulic accumulator for the telemetric transmission of data to the evaluation device, temperature value and pressure value signals supplied by transducers, the temperature meters and the pressure gauge on Manometer connection of the hydraulic accumulator are assigned. Preferably, the temperature value and pressure value signals via the modem of the relevant hydraulic accumulator telemetrically transmitted without further processing to the evaluation, where the corresponding computer program is performed to calculate from current temperature and pressure value corresponding to a reference temperature actual value of the gas pre-filling. This calculation can alternatively also already be made on the relevant hydraulic accumulator by means of an additional computer unit assigned to the modem, so that only the actual value of the gas pre-charge pressure is transmitted to the evaluation device for further display, for example as a visual display and / or alarm or the like.

Nachstehend ist die Erfindung anhand der Zeichnung im einzelnen erläutert. Es zeigen:

Fig. 1
einen Schaltplan der Anordnung eines Hydrospeichers mit einer Blockdarstellung einer zugeordneten Einrichtung zum Durchführen des erfindungsgemäßen Verfahrens in Verbindung mit einer zugehörigen Auswerteeinrichtung und
Fig. 2
eine Blockdarstellung einer Auswerteeinrichtung zur Durchführung des Verfahrens.
The invention is explained in detail below with reference to the drawing. Show it:
Fig. 1
a circuit diagram of the arrangement of a hydraulic accumulator with a block diagram of an associated means for performing the method according to the invention in conjunction with an associated evaluation and
Fig. 2
a block diagram of an evaluation device for performing the method.

Fig. 1 zeigt einen Hydrospeicher 1 in Form eines Blasenspeichers mit einer Gasseite 3 und einer Ölseite 5. Das erfindungsgemäße Verfahren kann auch mit einem Membranspeicher oder Kolbenspeicher in prinzipiell gleicher Weise durchgeführt werden. Zur Messung der Gastemperatur innerhalb der Gasseite 3 des Hydrospeichers 1 ist an diesem unmittelbar ein Temperaturmesser 7 mit zugehörigem Meßwandler 9 zur Umsetzung der Temperaturwerte in elektrische Meßsignale angeschlossen. Von der Gasseite 3 des Hydrospeichers 1 führt eine Leitung zu einem Manometeranschluß 11, an dem sowohl ein Druckmesser 13 als auch ein zweiter Temperaturmesser 15 angeschlossen sind. Druckmesser 13 und Temperaturmesser 15 weisen jeweils einen zugehörigen Meßwandler 17 bzw. 19 zur Umsetzung der Meßwerte in entsprechende elektrische Meßsignale auf.1 shows a hydraulic accumulator 1 in the form of a bladder accumulator with a gas side 3 and an oil side 5. The method according to the invention can also be carried out with a diaphragm accumulator or piston accumulator in basically the same way. For measuring the gas temperature within the Gas side 3 of the hydraulic accumulator 1 is connected to this directly a temperature meter 7 with associated transducer 9 for converting the temperature values into electrical measurement signals. From the gas side 3 of the hydraulic accumulator 1, a line leads to a pressure gauge connection 11 to which both a pressure gauge 13 and a second temperature gauge 15 are connected. Pressure gauges 13 and temperature gauges 15 each have an associated transducer 17 or 19 for converting the measured values into corresponding electrical measuring signals.

An der Ölseite 5 des Hydrospeichers 1 ist über eine Leitung 21 ein Sicherheits- und Absperrblock 23 angeschlossen, der die Verbindung zwischen dem Speicheranschluß S an der Leitung 21 sowie dem Druckanschluß P und dem Tankanschluß T bildet. Außer der üblichen Hauptabsperreinheit 25 weist der Sicherheits- und Absperrblock 23 ein Druckbegrenzungsventil 27 und ein elektromagnetisch steuerbares Zweiwegeventil 29 auf, das eine Verbindung der Ölseite 5 des Hydrospeichers 1 über die Leitung 21 und den Speicheranschluß S zum Tankanschluß T des Sicherheits- und Absperrblockes 23 ermöglicht, wenn sich das in der Zeichnung nicht dargestellte Ölventil am Hydrospeicher 1 im geöffneten Zustand befindet. Eine zur Überwachung der Offenstellung oder Schließstellung dieses vorzugsweise als Tellerventil ausgebildeten Ölventils vorgesehene Überwachungseinrichtung ist in Fig. 1 mit 31 bezeichnet und liefert über einen Meßwandler 33 ein entsprechendes Überwachungssignal.On the oil side 5 of the hydraulic accumulator 1, a safety and shut-off block 23 is connected via a line 21, which forms the connection between the memory port S on the line 21 and the pressure port P and the tank port T. In addition to the usual Hauptabsperreinheit 25, the safety and Absperrblock 23, a pressure relief valve 27 and an electromagnetically controllable two-way valve 29, which allows connection of the oil side 5 of the hydraulic accumulator 1 via the line 21 and the memory port S to the tank port T of the safety and shut-off block 23 when the oil valve, not shown in the drawing on the hydraulic accumulator 1 is in the open state. A for monitoring the open or closed position of this preferably designed as a poppet valve oil valve monitoring device is indicated in Fig. 1 with 31 and provides via a transducer 33, a corresponding monitoring signal.

Der Druckanschluß P des Sicherheits- und Absperrblockes 23 ist über ein elektromagnetisch betätigbares Wegeventil mit der Verbraucherleitung 37 in Verbindung, an der eine Motor- und Pumpeneinheit 39 angeschlossen ist. Leitungen, die vom Tankanschluß T des Sicherheits- und Absperrblockes 23 und vom Wegeventil 35 jeweils zum Tank 41 führen, sind mit 43 bzw. 45 bezeichnet. Ein zur Messung des Druckes der Ölseite 5 des Hydrospeichers 1 vorgesehener, am Manometeranschluß M des Sicherheits- und Absperrblockes 23 angeschlossener Druckmesser 47 weist einen Meßwandler 49 zum Erzeugen eines entsprechenden elektrischen Meßsignales auf.The pressure port P of the safety and shut-off block 23 is connected via an electromagnetically actuated directional control valve with the consumer line 37 in connection to which a motor and pump unit 39 is connected. Lines leading from the tank connection T of the safety and shut-off block 23 and the directional control valve 35 to the tank 41 are designated 43 and 45, respectively. A provided for measuring the pressure of the oil side 5 of the hydraulic accumulator 1, the pressure gauge port M of the safety and Absperrblockes 23 connected pressure gauge 47 has a transducer 49 for generating a corresponding electrical measurement signal.

Die Meßsignale der Meßwandler 9, 17, 19 und 49, sowie das Überwachungssignal des Meßwandlers 33 werden einem Modem 50 zugeführt, das Teil einer Telemetrieeinrichtung bildet, mittels deren eine Datenübertragung zu einer in Fig. 2 als Ganzes mit 51 bezeichneten Auswerteeinrichtung hin und von der Auswerteeinrichtung 51 zum Modem 50 hin erfolgt. Die Auswerteeinrichtung 51 beinhaltet ein Modem 53, eine Rechnereinheit 55 und ein Sichtanzeigegerät 57. Die Modems 50 und 53 weisen, je nachdem ob die Datenübertragung leitungsgebunden oder drahtlos erfolgt, die für das jeweilige Übertragungsverfahren geeigneten Modulator- und Demodulatoreinrichtungen sowie gegebenenfalls Sende- und Empfangseinrichtungen auf, wie dies bei Telemetriesystemen an sich bekannt ist.The measuring signals of the transducers 9, 17, 19 and 49, as well as the monitoring signal of the transducer 33 are supplied to a modem 50 which forms part of a telemetry device, by means of which a data transmission to a designated in Fig. 2 as a whole by 51 evaluation and out of the Evaluation device 51 to the modem 50 out. The evaluation device 51 includes a modem 53, a computer unit 55 and a display device 57. The modems 50 and 53, depending on whether the data transmission is wired or wireless, suitable for the respective transmission method modulator and demodulator and optionally transmitting and receiving devices , as is known in telemetry systems per se.

Zum Auslösen eines Meßvorganges erhält das Modem 50 telemetrisch einen Steuerbefehl, der veranlaßt, daß vom Modem 50 Steuersignale S1 und S2 an den Elektromagneten des Wegeventiles 35 und an den Elektromagneten des Wegeventiles 29 abgegeben werden, um die Druckzufuhr zur Ölseite 5 des Hydrospeichers 1 zu unterbrechen und diesen über die Leitung 21 über das Wegeventil 29 zum Tank 41 zu entleeren. Wenn die Entleerung abgeschlossen ist, was dadurch angezeigt wird, daß der Druckmesser 47 Drucklosigkeit feststellt und dies über den Meßwandler 49 als Signal E5 signal isiert, während gleichzeitig die Überwachungseinrichtung 31 über den Meßwandler 33 mit dem Überwachungssignal E4 signalisiert, daß das zuvor geöffnete Ölventil am Hydrospeicher 1 geschlossen ist, erfolgen die gasseitigen Temperatur- und Druckmessungen. Um eine Feststellung darüber zu treffen, wann auf der Gasseite 3 des Hydrospeichers 1 ein Temperaturausgleich eingetreten ist, d.h. wann die durch den Entleerungsvorgang des Speichers eingetretenen Temperaturänderungen ausgeglichen sind, werden Temperaturmessungen gleichzeitig sowohl mittels des Temperaturmessers 7 unmittelbar an der Gasseite 3 als auch mittels des Temperaturmessers 15 am räumlich davon distanzierten Manometeranschluß 11 durchgeführt, bis die über die zugeordneten Meßwandler 9 bzw. 19 erzeugten Meßsignale E3 bzw. E2 durch Übereinstimmung den Ausgleich signalisieren. Bei Erreichen dieses Zustandes wird gleichzeitig über einen Anschlußadapter 11 der aktuelle Gasdruck durch den Druckmesser 13 ermittelt und über den zugehörigen Meßwandler 17 als Meßsignal E1 zum Modem 50 zugeführt.To initiate a measurement process, the modem 50 telemetrically receives a control command that causes the modem 50 control signals S 1 and S 2 are delivered to the solenoid of the directional control valve 35 and the solenoid of the directional valve 29 to the pressure supply to the oil side 5 of the hydraulic accumulator. 1 to interrupt and to empty this via the line 21 via the directional control valve 29 to the tank 41. When the emptying is completed, which is indicated by the fact that the pressure gauge 47 detects pressure and this is signaled via the transducer 49 as a signal E 5 , while the monitoring device 31 via the transducer 33 with the monitoring signal E 4 signals that the previously opened Oil valve is closed on the hydraulic accumulator 1, carried the gas side temperature and pressure measurements. In order to make a determination as to when on the gas side 3 of the hydraulic accumulator 1 has occurred a temperature compensation, ie when the occurred by the emptying process of the memory temperature changes are compensated for temperature measurements simultaneously both by means of the temperature meter 7 directly on the gas side 3 and by means of temperature meter 15 carried out at the spatially distanced pressure gauge port 11 until the signals generated via the associated transducers 9 and 19 E 3 and E 2 signal by agreement the compensation. Upon reaching this state, the current gas pressure is simultaneously determined by the pressure gauge 13 via a connection adapter 11 and fed via the associated transducer 17 as a measuring signal E 1 to the modem 50.

Die Daten der so übermittelten Temperatur- und Druckwerte werden telemetrisch zum Modem 53 der Auswerteeinrichtung 51 übertragen. Deren Rechnereinheit 55 führt nun ein Rechenprogramm durch, um aus diesen Daten einen auf eine Bezugstemperatur bezogenen Istwert des Gas-Vorfülldruckes zu berechnen. Diese Berechnung kann mit sehr guter Näherung als isochore Idealgasberechnung erfolgen, beispielsweise bei Bezug auf eine Bezugstemperatur von 20°C nach der Gleichung p 0 = 293 T

Figure imgb0001

  • worin p0 der temperaturbezogene Istwert des Gas-Vorfülldruckes in Bar,
  • p der aktuelle gemessene Gasdruck in bar und
  • T die aktuelle Temperatur in Grad Kelvin bedeuten.
The data of the thus transmitted temperature and pressure values are transmitted telemetrically to the modem 53 of the evaluation device 51. Their computer unit 55 now carries out a computer program in order to calculate from these data an actual value of the gas pre-charge pressure related to a reference temperature. This calculation can be done with very good approximation as an isochoric ideal gas calculation, for example, when referring to a reference temperature of 20 ° C according to the equation p 0 = 293 T
Figure imgb0001
  • where p 0 is the temperature-related actual value of the gas pre-charge pressure in bar,
  • p is the actual measured gas pressure in bar and
  • T is the current temperature in degrees Kelvin.

Spezieller kann diese Berechnung durch Anwendung der Zustandsgleichung für reale Gase nach E. Bender erfolgen, vergleiche hierzu S. Rotthäuser "Verfahren zur Berechnung und Untersuchung hydropneumatischer Speicher", veröffentlichte Dissertationsschrift der Fakultät für Maschinenwesen der Rheinisch-Westfälischen Technischen Hochschule Aachen.More specifically, this calculation can be done by applying the equation of state for real gases according to E. Bender, see S. Rotthäuser "method for calculating and investigation hydro-pneumatic storage", published dissertation of the Faculty of Mechanical Engineering of the RWTH Aachen University.

Die von der Rechnereinheit 55 der Auswerteeinrichtung 51 als Funktion der Meßsignale E1, E2 und E3 berechneten Werte werden als Anzeigewerte A dem Sichtanzeigegerät 57 zugeführt, um visuell dargestellt zu werden und je nach Anwendungsfall und Bedarf spezieller analysiert und, beispielsweise durch Ausdrucken, dokumentiert zu werden.The values calculated by the computer unit 55 of the evaluation device 51 as a function of the measurement signals E 1 , E 2 and E 3 are supplied as display values A to the display device 57 in order to be displayed visually and depending on the application and needs specifically analyzed and, for example, by printing, to be documented.

Claims (8)

  1. Method for monitoring the gas pre-fill pressure of hydro stores, comprising the following steps:
    a) interrupting the pressure supply to the oil side (5) of the store (1) and emptying the content of the tank (41),
    b) measuring the gas temperature on the gas side (3) of the hydro store (1),
    c) measuring the gas pressure on the gas side (3) of the hydro store (1),
    d) detecting an actual value for the gas pre-fill pressure (p0) from data relating to the gas temperature, e.g. the gas pressure by means of an evaluation means (51),
    characterised in that the gas temperature and the gas pressure are measured until the temperature balancing following the emptying process is complete, in that a telemetric control command is supplied for initiating the measuring process, in that the data representing the gas temperature, e.g. the gas pressure are telemetrically transmitted to the remotely located evaluation means (51), and in that the temperature on the gas side (3) of the hydro store (1) and the temperature at a manometer connection (11) located remote from the hydro store (1), where the gas pressure is detected, are measured simultaneously for detecting the gas temperature once the temperature has been balanced out.
  2. Method according to Claim 1, characterised in that the telemetric data transmission is carried out by means of radio signals.
  3. Method according to Claim 1, characterised in that the telemetric data transmission is carried out by means of a measuring line, a telephone line, or the transmission of modulated signals via an electric supply network.
  4. Method according to one of the Claims 1 to 3, characterised in that temperature value (E3, E2) and pressure value signals (E1) are supplied to a modem (50) envisaged on the relevant hydro store (1) for telemetric transmission to an evaluation means (51) by means of transducers (9, 19, 17) associated with the temperature measuring device (7, e.g. 15) for both temperature measurements, and the pressure measuring device (13) on the manometer connection (11).
  5. Method according to Claim 4, characterised in that control signals are telemetrically supplied by the evaluation means (51) to the modem (50) of the relevant hydro store (1) for initiating a monitoring process.
  6. Method according to Claim 5, characterised in that a safety and shut-off block (23) connected on the oil side (5) of the hydro store (1) is controlled by means of the control signals supplied to the modem (50) for emptying the store, as well as an electromagnetically controlled valve means (35) for interrupting the pressure supply to the oil side (5) of the store (1).
  7. Method according to Claim 6, characterised in that monitoring signals (E4) are supplied to the modem (50) by means of a transducer (33) associated with the oil valve of the hydro store, displaying the open or closed position of the oil valve.
  8. Method according to one of the Claims 1 to 7, characterised in that a display value (A) characteristic for the functionality is calculated from the temperature (E2, E3) and pressure data (E1) processed by the evaluation means (S1) and visually (57) displayed.
EP00912645A 1999-04-16 2000-03-25 Method for monitoring the gas prefill pressure in hydraulic accumulators Expired - Lifetime EP1171715B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19917210 1999-04-16
DE19917210A DE19917210A1 (en) 1999-04-16 1999-04-16 Monitoring pre-filling gas pressure in hydraulic reservoirs involves interrupting pressure feed to oil side, emptying reservoir; measuring gas temp. until temp. balance achieved
PCT/EP2000/002648 WO2000063562A1 (en) 1999-04-16 2000-03-25 Method for monitoring the gas prefill pressure in hydraulic accumulators

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EP1171715B1 true EP1171715B1 (en) 2007-10-31

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ATE377155T1 (en) 2007-11-15
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WO2000063562A1 (en) 2000-10-26
DE19917210A1 (en) 2000-10-26
DE50014745D1 (en) 2007-12-13
EP1171715A1 (en) 2002-01-16

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