EP1171715A1 - Method for monitoring the gas prefill pressure in hydraulic accumulators - Google Patents

Method for monitoring the gas prefill pressure in hydraulic accumulators

Info

Publication number
EP1171715A1
EP1171715A1 EP00912645A EP00912645A EP1171715A1 EP 1171715 A1 EP1171715 A1 EP 1171715A1 EP 00912645 A EP00912645 A EP 00912645A EP 00912645 A EP00912645 A EP 00912645A EP 1171715 A1 EP1171715 A1 EP 1171715A1
Authority
EP
European Patent Office
Prior art keywords
temperature
pressure
gas
hydraulic accumulator
accumulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00912645A
Other languages
German (de)
French (fr)
Other versions
EP1171715B1 (en
Inventor
Otmar SCHÖN
Klaus Goebbels
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydac Technology GmbH
Original Assignee
Hydac Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP1171715A1 publication Critical patent/EP1171715A1/en
Application granted granted Critical
Publication of EP1171715B1 publication Critical patent/EP1171715B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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-filling pressure in hydraulic accumulators.
  • the operating properties of hydraulic accumulators are largely determined by the pre-filling pressure selected. It is therefore extremely important for the trouble-free and safe operation of stores and storage systems that monitoring is carried out in the periods between the usual maintenance intervals in order to determine whether the pre-filling pressure is constant within acceptable tolerances.
  • the measures usually carried out for this are time-consuming, lead to longer interruptions in operation and are particularly difficult in those cases where a larger number of spatially separated memories or memories which are installed in inaccessible locations in larger systems must be monitored.
  • the invention is based on the object of specifying a method which, on the other hand, makes monitoring in hydraulic accumulators considerably simplified.
  • this object the gas-precharge pressure in hydraulic accumulators is by a method for monitoring dissolved, comprising the steps of: a) interrupting the pressure supply to the oil side of the store and emptying • 5 of the content ren to the tank, b) measuring the gas temperature up to the time the temperature equalization achieved after emptying and determination of the gas temperature during temperature equalization, c) measuring the gas pressure when temperature equalization 0 is reached, and d) telemetric transmission of the data relating to the gas temperature or gas pressure to a spatially distant evaluation device for the purpose of displaying a reference temperature Actual value of the gas pre-filling pressure.
  • the telemetric data transmission createds a system which makes it possible to monitor the pre-filling pressure from the central control room with the least possible time and manpower.
  • the method according to the invention enables quick and easy monitoring even in the cases where memories are set up inaccessible within complex systems.
  • Advantageous areas of application are storage and storage systems in metallurgical and rolling mill systems, in power plants or, for example, in machine shops with several systems. By simplifying the 5 monitoring, the monitoring processes can be carried out at short time intervals, which is particularly advantageous when it is a question of hydraulic accumulators which are intended to perform safety functions.
  • 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 provided on each hydraulic accumulator to be monitored for the telemetric transmission of data to the evaluation device, is preferably supplied with temperature value and pressure value signals which are generated by measuring transducers which are assigned to the temperature gauges and the pressure gauge at the manometer connection of the hydraulic accumulator.
  • the temperature value and pressure value signals are preferably transmitted telemetrically via the modem of the hydraulic accumulator in question without further processing to the evaluation device, where the corresponding computing program is carried out in order to calculate the actual value of the gas pre-filling pressure corresponding to a reference temperature from the current temperature and pressure value.
  • This calculation can alternatively also be carried out 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-filling pressure is transmitted to the evaluation device for further display, for example as a visual display and / or for alarms or the like.
  • FIG. 1 shows a circuit diagram of the arrangement of a hydraulic accumulator with a block diagram of an associated device for carrying out the method according to the invention in connection with an associated evaluation device and
  • Fig. 2 is a block diagram of an evaluation device for performing the method.
  • FIG. 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 in principle in the same way with a membrane accumulator or piston accumulator.
  • a temperature meter 7 With the associated measuring transducer 9 for converting the temperature values into electrical measuring signals.
  • a line leads to a pressure gauge connection 1 1, to which both a pressure meter 1 3 and a second temperature meter 1 5 are connected.
  • Pressure meter 1 3 and temperature meter 1 5 each have an associated transducer 1 7 or 19 for converting the measured values into corresponding electrical measurement signals.
  • a safety and shut-off block 23 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 accumulator connection S on the line 21 and the pressure connection P and the tank connection T.
  • the safety and shut-off block 23 has a pressure relief valve 27 and an electromagnetically controllable two-way valve 29, which connects the oil side 5 of the hydraulic accumulator 1 via line 21 and the storage connection S to the tank connection T of the safety and shut-off block 23 enables when the oil valve (not shown in the drawing) on the hydraulic accumulator 1 is in the open state.
  • a monitoring device provided for monitoring the open or closed position of this oil valve which is preferably designed as a poppet valve, is designated 31 in FIG. 1 and supplies a corresponding monitoring signal via a measuring transducer 33.
  • the pressure connection P of the safety and shut-off block 23 is connected via an electromagnetically actuated directional valve to the consumer line 37, to which a motor and pump unit 39 is connected.
  • Lines that lead from the tank connection T of the safety and shut-off block 23 and from 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 on the manometer connection M of the safety and Blocking block 23 connected pressure meter 47 has a transducer 49 for generating a corresponding electrical measurement signal.
  • the measurement signals of the transducers 9, 1 7, 1 9 and 49, as well as the monitoring signal of the transducer 33 are fed to a modem 50 which forms part of a telemetry device by means of which a data transmission to one designated 51 as a whole in FIG. 2 Evaluation device and from the evaluation device 51 to the modem 50.
  • the evaluation device 51 includes a modem 53, a computer unit 0 55 and a visual display device 57.
  • the modems 50 and 53 have the modulator and demodulator devices suitable for the respective transmission method and, if appropriate, transmission - And receiving devices, as is known per se in telemetry systems. ' 5
  • the modem 50 receives a control command telemetrically, which causes the control signals S, and S 2 to be emitted by the modem 50 to the electromagnets of the directional control valve 35 and to the electromagnets of the directional control valve 29 in order to supply the pressure to the oil side 5 to interrupt the hydraulic accumulator 1 and empty it via line 21 via directional valve 29 to tank 41.
  • the emptying which is indicated by the fact that the pressure gauge 47 detects no pressure and signals this via the transducer 49 as signal E 5
  • the monitoring device 31 signals the transducer 33 via 5 with the monitoring signal E 4 that the previously opened one Oil valve on the hydraulic accumulator 1 is closed, the gas-side temperature and pressure measurements are carried out.
  • temperature measurements are carried out simultaneously by means of the temperature meter 7 directly on the gas side 3 and also by means of of the tempera- Turmessers 1 5 performed on the spatially distanced manometer connection 1 1 until the measurement signals E 3 or E 2 generated via the assigned transducers 9 or 1 9 signal the compensation by matching.
  • the current gas pressure is determined by the pressure gauge 1 3 at the same time via a connection adapter 11 and is fed to the modem 50 as a measurement signal E via the associated measuring transducer 17.
  • the data of the temperature and pressure values thus transmitted are transmitted telemetrically to the modem 53 of the evaluation device 51.
  • the computer unit 55 now executes a computer program in order to use this data to calculate an actual value of the gas pre-filling pressure related to a reference temperature. This calculation can be done with a very good approximation as an isochoric ideal gas calculation, for example with reference to a reference temperature of 20 ° C according to the equation
  • p 0 is the temperature-related actual value of the gas pre-filling pressure in bar
  • p is the current measured gas pressure in bar
  • T is the current temperature in degrees Kelvin.
  • the values calculated by the computer unit 55 of the evaluation device 51 as a function of the measurement signals EE 2 and E 3 are supplied to the display device 57 as display values A in order to be displayed visually and depending on the application and needs, to be analyzed and documented more specifically, for example by printing.

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

Verfahren zur Überwachung des Gas-Vorfülldruckes bei Hydrospeichern Procedure for monitoring the gas pre-filling pressure in hydraulic accumulators
Die Erfindung bezieht sich auf ein Verfahren zur Überwachung des Gas- Vorfülldruckes bei Hydrospeichern.The invention relates to a method for monitoring the gas pre-filling pressure in hydraulic accumulators.
Die Betriebseigenschaften von Hydrospeichern werden wesentlich vom gewählten Vorfülldruck bestimmt. Daher ist es für einen einwandfreien und sicheren Betrieb von Speichern und Speicheranlagen äußerst wichtig, daß in den zwischen den üblichen Wartungsintervallen liegenden Zeitabschnitten eine Überwachung durchgeführt wird, um festzustellen, ob Konstanz des Vorfülldruckes innerhalb akzeptabler Toleranzen vorliegt. Die hierfür üblicherweise durchgeführten Maßnahmen sind zeitraubend, führen zu längeren Betriebsunterbrechungen und gestalten sich insbesondere in solchen Fällen schwierig, wo eine größere Anzahl räumlich voneinander getrennter Speicher oder Speicher, die an unzugänglichen Stellen in größeren Anlagen eingebaut sind, überwacht werden müssen.The operating properties of hydraulic accumulators are largely determined by the pre-filling pressure selected. It is therefore extremely important for the trouble-free and safe operation of stores and storage systems that monitoring is carried out in the periods between the usual maintenance intervals in order to determine whether the pre-filling pressure is constant within acceptable tolerances. The measures usually carried out for this are time-consuming, lead to longer interruptions in operation and are particularly difficult in those cases where a larger number of spatially separated memories or memories which are installed in inaccessible locations in larger systems must be monitored.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, das eine demgegenüber wesentlich vereinfachte Überwachung bei Hydrospeichern ermöglicht. Erfindungsgemäß ist diese Aufgabe durch ein Verfahren zur Überwachung des Gas-Vorfülldruckes bei Hydrospeichern gelöst, das die Schritte beinhaltet: a) Unterbrechen der Druckzufuhr zur Ölseite des Speichers und Entlee- •5 ren des Inhaltes zum Tank, b) Messen der Gastemperatur bis zum Zeitpunkt des nach der Entleerung erreichten Temperaturausgleiches und Ermittlung der Gastemperatur bei Temperaturausgleich, c) Messen das Gasdruckes bei Erreichen des Temperaturausgleiches 0 und d) telemetrisches Übermitteln der auf die Gastemperatur bzw. den Gasdruck bezogenen Daten an eine räumlich entfernt angeordnete Auswerteeinrichtung zwecks Darstellung eines einer Bezugstemperatur entsprechenden Istwertes des Gas-Vorfülldruckes. -5The invention is based on the object of specifying a method which, on the other hand, makes monitoring in hydraulic accumulators considerably simplified. According to the invention this object the gas-precharge pressure in hydraulic accumulators is by a method for monitoring dissolved, comprising the steps of: a) interrupting the pressure supply to the oil side of the store and emptying • 5 of the content ren to the tank, b) measuring the gas temperature up to the time the temperature equalization achieved after emptying and determination of the gas temperature during temperature equalization, c) measuring the gas pressure when temperature equalization 0 is reached, and d) telemetric transmission of the data relating to the gas temperature or gas pressure to a spatially distant evaluation device for the purpose of displaying a reference temperature Actual value of the gas pre-filling pressure. -5
Durch die erfindungsgemäß vorgesehene telemetrische Datenübermittlung ist ein System geschaffen, das es ermöglicht, von einer zentralen Meßwarte aus die Überwachung des Vorfül ldruckes mit geringstmöglichem zeitlichem und personellem Aufwand durchzuführen. Das erfindungsgemäße Verfah- 0 ren 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 5 Überwachung lassen sich die Überwachungsvorgänge in kurzen Zeitabständen durchführen, was insbesondere vorteilhaft ist, wenn es sich um Hydrospeicher handelt, die Sicherheitsfunktionen erfüllen sollen.The telemetric data transmission provided according to the invention creates a system which makes it possible to monitor the pre-filling pressure from the central control room with the least possible time and manpower. The method according to the invention enables quick and easy monitoring even in the cases where memories are set up inaccessible within complex systems. Advantageous areas of application are storage and storage systems in metallurgical and rolling mill systems, in power plants or, for example, in machine shops with several systems. By simplifying the 5 monitoring, the monitoring processes can be carried out at short time intervals, which is particularly advantageous when it is a question of hydraulic accumulators which are intended to perform safety functions.
Die telemetrische Datenübermittlung kann über Funk, über Meßleitung, 30 über das Telefonnetz oder, unter Anwendung geeigneter Modulationsverfahren, beispielsweise über das elektrische Versorgungsnetz erfolgen. Vorzugsweise 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 Tempera- tur- 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-Rechnerinheit 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.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 provided on each hydraulic accumulator to be monitored for the telemetric transmission of data to the evaluation device, is preferably supplied with temperature value and pressure value signals which are generated by measuring transducers which are assigned to the temperature gauges and the pressure gauge at the manometer connection of the hydraulic accumulator. The temperature value and pressure value signals are preferably transmitted telemetrically via the modem of the hydraulic accumulator in question without further processing to the evaluation device, where the corresponding computing program is carried out in order to calculate the actual value of the gas pre-filling pressure corresponding to a reference temperature from the current temperature and pressure value. This calculation can alternatively also be carried out 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-filling pressure is transmitted to the evaluation device for further display, for example as a visual display and / or for alarms or the like.
Nachstehend ist die Erfindung anhand der Zeichnung im einzelnen erläutert. Es zeigen:The invention is explained in detail below with reference to the drawing. Show it:
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 und1 shows a circuit diagram of the arrangement of a hydraulic accumulator with a block diagram of an associated device for carrying out the method according to the invention in connection with an associated evaluation device and
Fig. 2 eine Blockdarstellung einer Auswerteeinrichtung zur Durchführung des Verfahrens.Fig. 2 is 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 1 1 , an dem sowohl ein Druckmesser 1 3 als auch ein zweiter Temperaturmesser 1 5 angeschlossen sind. Druckmesser 1 3 und Temperaturmesser 1 5 weisen jeweils einen zugehörigen Meßwandler 1 7 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 in principle in the same way with a membrane accumulator or piston accumulator. To measure the gas temperature within the Gas side 3 of the hydraulic accumulator 1 is directly connected to a temperature meter 7 with the associated measuring transducer 9 for converting the temperature values into electrical measuring signals. From the gas side 3 of the hydraulic accumulator 1, a line leads to a pressure gauge connection 1 1, to which both a pressure meter 1 3 and a second temperature meter 1 5 are connected. Pressure meter 1 3 and temperature meter 1 5 each have an associated transducer 1 7 or 19 for converting the measured values into corresponding electrical measurement signals.
An der Ölseite 5 des Hydrospeichers 1 ist über eine Leitung 21 ein Sicher- heits- 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 Druckbegrenzungsventi l 27 und ein elektromagnetisch steuerbares Zwei Wegeventil 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 accumulator connection S on the line 21 and the pressure connection P and the tank connection T. In addition to the usual main shut-off unit 25, the safety and shut-off block 23 has a pressure relief valve 27 and an electromagnetically controllable two-way valve 29, which connects the oil side 5 of the hydraulic accumulator 1 via line 21 and the storage connection S to the tank connection T of the safety and shut-off block 23 enables when the oil valve (not shown in the drawing) on the hydraulic accumulator 1 is in the open state. A monitoring device provided for monitoring the open or closed position of this oil valve, which is preferably designed as a poppet valve, is designated 31 in FIG. 1 and supplies a corresponding monitoring signal via a measuring transducer 33.
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 Ab- sperrblockes 23 angeschlossener Druckmesser 47 weist einen Meßwandler 49 zum Erzeugen eines entsprechenden elektrischen Meßsignales auf.The pressure connection P of the safety and shut-off block 23 is connected via an electromagnetically actuated directional valve to the consumer line 37, to which a motor and pump unit 39 is connected. Lines that lead from the tank connection T of the safety and shut-off block 23 and from 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 on the manometer connection M of the safety and Blocking block 23 connected pressure meter 47 has a transducer 49 for generating a corresponding electrical measurement signal.
Die Meßsignale der Meßwandler 9, 1 7, 1 9 und 49, sowie das Überwa- 5 chungssignal 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 0 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 Demo- dulatoreinrichtungen sowie gegebenenfal ls Sende- und Empfangseinrichtungen auf, wie dies bei Telemetriesystemen an sich bekannt ist. '5The measurement signals of the transducers 9, 1 7, 1 9 and 49, as well as the monitoring signal of the transducer 33 are fed to a modem 50 which forms part of a telemetry device by means of which a data transmission to one designated 51 as a whole in FIG. 2 Evaluation device and from the evaluation device 51 to the modem 50. The evaluation device 51 includes a modem 53, a computer unit 0 55 and a visual display device 57. Depending on whether the data transmission is wired or wireless, the modems 50 and 53 have the modulator and demodulator devices suitable for the respective transmission method and, if appropriate, transmission - And receiving devices, as is known per se in telemetry systems. ' 5
Zum Auslösen eines Meßvorganges erhält das Modem 50 telemetrisch einen Steuerbefehl, der veranlaßt, daß vom Modem 50 Steuersignale S, und S2 an den Elektromagneten des Wegeventiles 35 und an den Elektromagneten des Wegeventiles 29 abgegeben werden, um die Druckzufuhr zur Öl- 0 seite 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 signalisiert, während gleichzeitig die Überwachungseinrichtung 31 über 5 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 0 des Speichers eingetretenen Temperaturänderungen ausgeglichen sind, werden Temperaturmessungen gleichzeitig sowohl mittels des Temperaturmessers 7 unmittelbar an der Gasseite 3 als auch mittels des Tempera- turmessers 1 5 am räumlich davon distanzierten Manometeranschluß 1 1 durchgeführt, bis die über die zugeordneten Meßwandler 9 bzw. 1 9 erzeugten Meßsignale E3 bzw. E2 durch Übereinstimmung den Ausgleich signal isieren. Bei Erreichen dieses Zustandes wird gleichzeitig über einen An- schlußadapter 1 1 der aktuelle Gasdruck durch den Druckmesser 1 3 ermittelt und über den zugehörigen Meßwandler 1 7 als Meßsignal E, zum Modem 50 zugeführt.To trigger a measuring process, the modem 50 receives a control command telemetrically, which causes the control signals S, and S 2 to be emitted by the modem 50 to the electromagnets of the directional control valve 35 and to the electromagnets of the directional control valve 29 in order to supply the pressure to the oil side 5 to interrupt the hydraulic accumulator 1 and empty it via line 21 via directional valve 29 to tank 41. When the emptying is completed, which is indicated by the fact that the pressure gauge 47 detects no pressure and signals this via the transducer 49 as signal E 5 , while at the same time the monitoring device 31 signals the transducer 33 via 5 with the monitoring signal E 4 that the previously opened one Oil valve on the hydraulic accumulator 1 is closed, the gas-side temperature and pressure measurements are carried out. In order to make a determination of when a temperature equalization has occurred on the gas side 3 of the hydraulic accumulator 1, i.e. when the temperature changes caused by the emptying process 0 of the accumulator are equalized, temperature measurements are carried out simultaneously by means of the temperature meter 7 directly on the gas side 3 and also by means of of the tempera- Turmessers 1 5 performed on the spatially distanced manometer connection 1 1 until the measurement signals E 3 or E 2 generated via the assigned transducers 9 or 1 9 signal the compensation by matching. When this state is reached, the current gas pressure is determined by the pressure gauge 1 3 at the same time via a connection adapter 11 and is fed to the modem 50 as a measurement signal E via the associated measuring transducer 17.
Die Daten der so übermittelten Temperatur- und Druckwerte werden tele- metrisch 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 GleichungThe data of the temperature and pressure values thus transmitted are transmitted telemetrically to the modem 53 of the evaluation device 51. The computer unit 55 now executes a computer program in order to use this data to calculate an actual value of the gas pre-filling pressure related to a reference temperature. This calculation can be done with a very good approximation as an isochoric ideal gas calculation, for example with reference to a reference temperature of 20 ° C according to the equation
293p293p
PoButt
TT
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.where p 0 is the temperature-related actual value of the gas pre-filling pressure in bar, p is the current measured gas pressure in bar and T is the current temperature in degrees Kelvin.
Spezieller kann diese Berechnung durch Anwendung der Zustandsglei- chung 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.This calculation can be carried out more specifically by applying the state equation for real gases according to E. Bender, see S. Rotthauser's "Methods for Calculating and Investigating Hydropneumatic Storage", a dissertation published by the Faculty of Mechanical Engineering at the Rheinisch-Westfälische Technische Hochschule Aachen.
Die von der Rechnereinheit 55 der Auswerteeinrichtung 51 als Funktion der Meßsignale E E2 und E3 berechneten Werte werden als Anzeigewerte A dem Sichtanzeigegerät 57 zugeführt, um visuell dargestellt zu werden und je nach Anwendungsfal l 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 EE 2 and E 3 are supplied to the display device 57 as display values A in order to be displayed visually and depending on the application and needs, to be analyzed and documented more specifically, for example by printing.

Claims

P a t e n t a n s p r ü c h eP a t e n t a n s r u c h e
1 ) Verfahren zur Überwachung des Gas-Vorfülldruckes bei Hydrospeichern, das die Schritte beinhaltet: a) Unterbrechen der Druckzufuhr zur Ölseite (5) des Speichers1) Method for monitoring the gas pre-filling pressure in hydraulic accumulators, which comprises the steps: a) interrupting the pressure supply to the oil side (5) of the accumulator
(1 ) und Entleeren des Inhaltes zum Tank (41 ), b) Messen der Gastemperatur bis zum Zeitpunkt des nach der(1) and emptying the contents to the tank (41), b) measuring the gas temperature up to the time after the
Entleerung erreichten Temperaturausgleiches und Ermittlung der Gastemperatur bei Temperaturausgleich, c) Messen des Gasdruckes bei Erreichen des Temperaturausgleiches und d) telemetrisches Übermitteln der auf die Gastemperatur bzw. den Gasdruck bezogenen Daten an eine räumlich entfernt angeordnete Auswerteeinrichtung (51 ) zwecks Darstellung eines einer Bezugstemperatur entsprechenden Istwertes desEmptying of the temperature equalization and determination of the gas temperature during temperature equalization, c) measuring the gas pressure when the temperature equalization is reached and d) telemetric transmission of the data relating to the gas temperature or gas pressure to a spatially distant evaluation device (51) for the purpose of displaying an actual value corresponding to a reference temperature of
Gas-Vorfülldruckes (p0).Gas pre-filling pressure (p 0 ).
2) Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die telemetrische Datenübermittlung durch Funksignale durchgeführt wird.2) Method according to claim 1, characterized in that the telemetric data transmission is carried out by radio signals.
3) Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die telemetrische Datenübermittlung über eine Meßleitung, eine Fernsprechleitung oder die Übertragung modulierter Signale über ein elektrisches Versorgungsnetz durchgeführt wird.3) Method according to claim 1, characterized in that the telemetric data transmission is carried out via a measuring line, a telephone line or the transmission of modulated signals via an electrical supply network.
4) Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zur Ermittlung der Gastemperatur bei Temperaturausgleich die Temperatur der Gasseite (3) des Hydrospeichers (1 ) und gleichzeitig die Temperatur an einem vom Hydrospeicher (1 ) räumlich ge- trennten Manometeranschluß (1 1 ) gemessen wird, an dem der Gasdruck ermittelt wird. 5) Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß durch Meßwandler (9, 1 9, 1 7), die den Temperaturmessern (7 bzw. 1 5) für beide Temperaturmessungen und dem Druckmesser (1 3) am Manometeranschluß (1 1 ) zugeordnet sind, Temperaturwert- (E3, E2) und Druckwertsignale (E,) einem am betreffenden Hydrospeicher (1 ) vorgesehenen Modem (50) für die telemetrische Übermittlung zur Auswerteeinrichtung (51 ) zugeführt werden.4) Method according to one of claims 1 to 3, characterized in that to determine the gas temperature at temperature compensation, the temperature of the gas side (3) of the hydraulic accumulator (1) and at the same time the temperature at a manometer connection spatially separated from the hydraulic accumulator (1) 1 1) is measured, on which the gas pressure is determined. 5) Method according to claim 4, characterized in that by measuring transducers (9, 1 9, 1 7), which are assigned to the temperature gauges (7 and 1 5) for both temperature measurements and the pressure gauge (1 3) at the pressure gauge connection (1 1) are temperature value (E 3 , E 2 ) and pressure value signals (E,) a modem (50) provided on the relevant hydraulic accumulator (1) for telemetric transmission to the evaluation device (51).
6) Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß zur Aus- lösung eines Überprüfungsvorganges Steuersignale telemetrisch von der Auswerteeinrichtung (51 ) zum Modem (50) des betreffenden Hydrospeichers (1 ) zugeführt werden.6) Method according to claim 5, characterized in that control signals are telemetrically fed from the evaluation device (51) to the modem (50) of the relevant hydraulic accumulator (1) in order to trigger a checking process.
7) Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß durch die dem Modem (50) zugeführten Steuersignale ein an der Ölseite (5) des Hydrospeichers (1 ) angeschlossener Sicherheits- und Absperrblock (23) zur Entleerung des Speichers sowie eine Ventileinrichtung (35) zum Unterbrechen der Druckzufuhr zur Ölseite (5) des Speichers (1 ) jeweils elektromagnetisch gesteuert werden.7) Method according to claim 6, characterized in that by the control signals supplied to the modem (50) a safety and shut-off block (23) connected to the oil side (5) of the hydraulic accumulator (1) for emptying the accumulator and a valve device (35) to interrupt the pressure supply to the oil side (5) of the memory (1) can be controlled electromagnetically.
8) Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß mittels eines dem Ölventi l des Hydrospeichers zugeordneten Meßwandlers (33) Überwachungssignale (E4) dem Modem (50) zugeführt werden, die Offenstellung oder Schließstellung des Ölventils kennzeichnen.8) Method according to claim 7, characterized in that by means of a measuring transducer (33) assigned to the oil valve of the hydraulic accumulator (33), monitoring signals (E 4 ) are fed to the modem (50) which identify the open or closed position of the oil valve.
9) Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß aus den in der Auswerteeinrichtung (51 ) verarbeiteten Temperatur- (E2, E3) und Druckdaten (E,) ein die Funktionstüchtigkeit kennzeichnender Anzeigewert (A) gebildet und visuell (57) darge- stellt wird. 9) Method according to one of claims 1 to 8, characterized in that from the temperature (E 2 , E 3 ) and pressure data (E,) processed in the evaluation device (51), a functional value indicating display value (A) is formed and visual (57) is shown.
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
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
DE19917210 1999-04-16
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 EP1171715B1 (en) 2007-10-31

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EP (1) EP1171715B1 (en)
AT (1) ATE377155T1 (en)
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WO2000063562A1 (en) 2000-10-26
DE50014745D1 (en) 2007-12-13
EP1171715B1 (en) 2007-10-31
ES2292434T3 (en) 2008-03-16
ATE377155T1 (en) 2007-11-15
DK1171715T3 (en) 2008-03-03
DE19917210A1 (en) 2000-10-26

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