EP0585280B1 - Verfahren zum messen des druckes eines gases in einem gasdruckspeicher und vorrichtung zum durchführen desselben - Google Patents

Verfahren zum messen des druckes eines gases in einem gasdruckspeicher und vorrichtung zum durchführen desselben 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
Authority
EP
European Patent Office
Prior art keywords
gas
pressure
accumulator
fluid
gas 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.)
Expired - Lifetime
Application number
EP92909795A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0585280A1 (de
Inventor
Günter Peter
Norbert Weber
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 EP0585280A1 publication Critical patent/EP0585280A1/de
Application granted granted Critical
Publication of EP0585280B1 publication Critical patent/EP0585280B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Detergent Compositions (AREA)
  • Cash Registers Or Receiving Machines (AREA)
  • Pens And Brushes (AREA)
  • Pipeline Systems (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)
EP92909795A 1991-05-21 1992-05-13 Verfahren zum messen des druckes eines gases in einem gasdruckspeicher und vorrichtung zum durchführen desselben Expired - Lifetime EP0585280B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4116482 1991-05-21
DE4116482A DE4116482A1 (de) 1991-05-21 1991-05-21 Verfahren zum messen des druckes eines gases in einem gasdruckspeicher und vorrichtung zum durchfuehren desselben
PCT/EP1992/001047 WO1992021012A1 (de) 1991-05-21 1992-05-13 Verfahren zum messen des druckes eines gases in einem gasdruckspeicher und vorrichtung zum durchführen desselben

Publications (2)

Publication Number Publication Date
EP0585280A1 EP0585280A1 (de) 1994-03-09
EP0585280B1 true EP0585280B1 (de) 1994-10-26

Family

ID=6432063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92909795A Expired - Lifetime EP0585280B1 (de) 1991-05-21 1992-05-13 Verfahren zum messen des druckes eines gases in einem gasdruckspeicher und vorrichtung zum durchführen desselben

Country Status (10)

Country Link
US (1) US5445034A (da)
EP (1) EP0585280B1 (da)
JP (1) JPH06507696A (da)
AT (1) ATE113377T1 (da)
AU (1) AU655020B2 (da)
DE (2) DE4116482A1 (da)
DK (1) DK0585280T3 (da)
ES (1) ES2063583T3 (da)
FI (1) FI935101A (da)
WO (1) WO1992021012A1 (da)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4227657A1 (de) * 1992-08-21 1994-02-24 Hydac Technology Gmbh Ultraschall-Prüfeinrichtung für Gasdruckspeicher
US20050067895A1 (en) * 2003-09-25 2005-03-31 Marathe Sameer S. Apparatus and method of monitoring braking system pressure
US8953732B2 (en) * 2010-12-09 2015-02-10 Westinghouse Electric Company Llc Nuclear reactor internal hydraulic control rod drive mechanism assembly
DE102011090050A1 (de) * 2011-12-28 2013-07-04 Robert Bosch Gmbh Verfahren zum Bestimmen einer Position eines Kolbens in einem Kolbendruckspeicher mittels Induktivsensoren sowie geeignet ausgebildeter Kolbendruckspeicher
FR2994466A1 (fr) * 2012-08-13 2014-02-14 Faurecia Sys Echappement Accumulateur oleopneumatique et procede de fabrication associe
DE102014203058A1 (de) * 2014-02-20 2015-08-20 Siemens Aktiengesellschaft Überwachungseinrichtung zur Überwachung eines Gasdruckes und gasisolierte Schaltanlage
DE102019001436A1 (de) * 2019-02-28 2020-09-03 Hydac Technology Gmbh Verfahren zum Ermitteln eines Speicherdruckes nebst zugehöriger Vorrichtung
DE102022000197A1 (de) 2022-01-20 2023-07-20 Hydac Technology Gmbh Hydrospeicher
DE102022000382A1 (de) 2022-02-01 2023-08-03 Hydac Technology Gmbh Hydrospeicher
DE102022000511A1 (de) 2022-02-10 2023-08-10 Hydac Technology Gmbh Hydrospeicher

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JPH0652210B2 (ja) * 1987-08-26 1994-07-06 宣行 杉村 アキユムレ−タのガス封入圧力測定方法
JPH0652211B2 (ja) * 1987-09-14 1994-07-06 宣行 杉村 アキュムレータのガス封入圧力測定方法
US5195380A (en) * 1991-05-17 1993-03-23 Texaco Inc. Petroleum stream analyzing means and method
DE4131524A1 (de) * 1991-09-21 1993-04-01 Hydac Technology Gmbh Membranspeicher mit befestigungsring

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Title
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Patent Abstracts of Japan, vol. 13, no. 291 (P-893)(3639), 6 July 1989 & JP-A-1073232 *

Also Published As

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

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