EP0855014A2 - Systeme de mesure permettant de detecter la position d'un piston - Google Patents

Systeme de mesure permettant de detecter la position d'un piston

Info

Publication number
EP0855014A2
EP0855014A2 EP96945358A EP96945358A EP0855014A2 EP 0855014 A2 EP0855014 A2 EP 0855014A2 EP 96945358 A EP96945358 A EP 96945358A EP 96945358 A EP96945358 A EP 96945358A EP 0855014 A2 EP0855014 A2 EP 0855014A2
Authority
EP
European Patent Office
Prior art keywords
sensor
piston
cylinder
detecting
drive
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.)
Ceased
Application number
EP96945358A
Other languages
German (de)
English (en)
Inventor
Detlev Schuckar
Manfred Wege
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0855014A2 publication Critical patent/EP0855014A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/48—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using wave or particle radiation 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/02—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means
    • G01D5/06—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means acting through a wall or enclosure, e.g. by bellows, by magnetic coupling
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/42—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using fluid means
    • G01D5/425—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using fluid means characterised by a first part whose movement represents the measuring value, and by a second part which is moved by an external force in order to follow the movement of the first part
    • 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
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/515—Position detection for separating means

Definitions

  • the invention relates to a measuring system for detecting the position of a piston movable in a pressurizable cylinder.
  • Such a measuring system is known, for example, from the operating instructions for the Siemens 3AT2 high-voltage circuit breaker, pages 300/6 to 300/7.
  • a cylinder is described there in which a piston which seals on the cylinder wall slides and in which hydraulic oil is provided on one side of the piston and nitrogen in gaseous form on the other side of the piston.
  • the cylinder serves as an energy store for driving the switch and is charged with energy by injecting hydraulic oil and correspondingly compressing the nitrogen.
  • the pressure in the cylinder is checked by pressure switches and hydraulic oil is pumped in if necessary.
  • the amount of nitrogen present in the cylinder should remain constant and only pressure and temperature should change. If, however, nitrogen is lost through the non-ideal seals, a change in the position of the piston results at the same hydraulic pressure, which position is detected via several stationary proximity switches.
  • DE 92 18 883 U1 discloses a device for position determination in a pressure-operated working cylinder, in which a sensor responds to a movable position transmitter and the sensor can be displaced along the movement path of the position transmitter for adjustment purposes. In operation, however, the sensor only provides information as to whether the position transmitter is in its vicinity or not.
  • the present invention has for its object to provide a measuring system of the type mentioned with a to enable a precise and reliable position measurement.
  • a position sensor connected to the piston, a sensor which can be driven along the movement path of the position sensor outside the cylinder by means of a drive and which detects a signal strength as a function of its distance from the position sensor, a control device connected to the sensor, issues the commands to the drive and thereby sets the position of the sensor in which it detects a maximum signal strength, and a device for detecting the position of the sensor.
  • the sensor is moved along the cylinder by the control device by means of the drive until it detects a maximum signal strength and thus indicates that it has moved as close as possible to the position transmitter.
  • the position of the position transmitter in the cylinder can be inferred from the position of the sensor.
  • a possibly existing distance between the position transmitter and the sensor in the direction of movement of the piston with a maximum signal strength can first be measured to calibrate the measuring system without pressurizing the cylinder and later taken into account during measurements during operation.
  • One such simple verification option is in a system with a plurality of sensors which are fixed at a distance from one another and difficult to detect a position transmitter.
  • the position of the sensor can be measured very simply using conventional methods outside the cylinder which can be pressurized, for example by means of a resistance tap or by one of the devices described below.
  • the partial volume of the cylinder separated by the piston can be determined in a simple manner from the position of the position transmitter determined by means of the measuring system.
  • a temperature measurement sensor can be provided in the area of the cylinder, so that the temperature of the filling medium is also available as a measurement variable.
  • the partial volume can be filled, for example, with a gas, in particular with stiff substance, which serves as an energy store for a high-voltage circuit breaker.
  • the amount of nitrogen present in the volume or the number of molecules can then be determined with known constants or a reference amount of nitrogen relate substance.
  • the amount of gas still available in the cylinder can be determined and a decision can be made as to whether this is sufficient for storing the energy required to switch a high-voltage switch. If the gas quantity is no longer sufficient, for example a warning signal can be issued or the switch can be blocked or switched off.
  • the device for detecting the position of the sensor can advantageously be an evaluation device for detecting and evaluating Have evaluation of the control signals given by the control system to the drive and to determine the position of the piston from its initial position and the control signals.
  • control signals are usually already in the form of electrical signals and can be output directly to an evaluation device.
  • Detection of the activity of the drive and a device for determining the position of the piston from its starting position and the activity of the drive.
  • the device for recording the activity of the drive can be formed, for example, by a counter which counts the revolutions of the motor.
  • An advantageous embodiment of the invention provides that the position transmitter has a magnet and that the sensor is suitable for detecting magnetic fields.
  • Such magnetic fields can also be detected by means of sensitive sensors through relatively thick, metallic cylinder walls. This type of signal transmission is less susceptible to contamination and malfunction, particularly under the harsh operating conditions of a high-voltage circuit breaker. It can be guaranteed to work for years.
  • An ultrasound transmitter can also advantageously be provided for irradiating ultrasound signals into the cylinder, and in this case the sensor can be an ultrasound sensor. This also makes it possible to locate a position transmitter which is connected to a piston in the interior of a cylinder. In this case, a piston surface can already serve as the position transmitter, which forms a sharp reflection edge in the ultrasound image.
  • the invention also relates to a method for detecting the position of a piston which can be moved in a pressurizable cylinder, in which a position transmitter is connected to the piston and, by means of a control device, a sensor which is dependent on its distance from the Position transmitter detects a signal strength, is driven along the movement path of the position transmitter outside the cylinder by means of a drive in such a way that a position of the sensor is set at which it reaches a maximum
  • the invention also includes a method for detecting the amount of gas stored within a cylinder by means of the measuring system according to the invention, in which the position of the piston is first detected by means of the above-mentioned method and the gas volume is determined from the position of the piston and from the hydraulic pressure acting on the piston Gas pressure is determined and the temperature is measured, and that the quantity of gas inside the cylinder is determined from the quantities of pressure, temperature and volume and is related to a reference gas quantity.
  • FIG. 1 schematically shows the system according to the invention with a first device for detecting the position of the sensor
  • 2 shows the measuring system according to the invention with a second device for detecting the position of the sensor
  • FIG. 3 shows a further embodiment of the device for detecting the position of the sensor.
  • a first area 2 of the cylinder 1 is filled with a hydraulic oil.
  • the cylinder 1 has two connections 3, 4, a hydraulic pump 5 being connected to the one connection 3, which acts on the hydraulic oil with a certain, adjustable pressure of several bars.
  • the piston 6 moves within the cylinder 1 to make room for the hydraulic oil and thereby reduces the gas volume 7, which is filled with nitrogen, for example.
  • the gas pressure in the gas volume 7 essentially corresponds to the hydraulic pressure present, since the piston 6 is freely movable.
  • the piston 6 is sealed by means of seals 8, 9 on the inner wall of the cylinder 1.
  • the cylinder 1 has a further connection 4, to which a drive cylinder which is actuable by means of the hydraulic oil and which is not shown is connected. Hydraulic oil is drained from cylinder 1 suddenly via a valve to actuate the drive cylinder. The expanding compressible gas in the gas volume 7 serves as an energy store. Because of its extensive incompressibility, the hydraulic oil is hardly able for me to store energy to any appreciable extent.
  • a pressure switch 10 monitors the hydraulic pressure and controls the pump 5 to replenish hydraulic oil.
  • the number of gas molecules in the gas volume 7 can be determined from the volume, the prevailing pressure and the temperature with knowledge of the gas constant, taking into account the gas equation. Since the pressure is essentially with the aid of a pressure switch 10 Determinable and also the temperature measurable, all that remains is to determine the position of the piston 6 and thus the gas volume in order to then be able to calculate the amount of gas in the gas volume 7 from the given quantities.
  • a magnet 11 is attached to the piston 6 as a position transmitter, the magnetic field of which at least partially reaches through the wall of the cylinder 1 and is registered by a sensor 12.
  • the sensor 12 is on a spindle 13 by rotating the spindle 13 by means of a motor
  • the sensor 12 is in a holder
  • the sensor 12 can, for example, be a Hall sensor.
  • the sensor 12 By actuating the motor 14, the sensor 12 can be moved along the cylinder 1.
  • the intensity of the magnetic field can be measured continuously and thus an intensity distribution can be detected.
  • the highest magnetic field strength is measured at the position of the magnet 11.
  • a control device 17 which issues commands via a line 18 to the motor 14 and at the same time the respectively detected magnetic field intensity from the sensor 12 registered.
  • the motor is actuated until a maximum magnetic field intensity is registered by the sensor 12. In this situation it is assumed that the sensor 12 is exactly opposite the magnet 11 serving as a position transmitter.
  • the movement transmitted by the motor 14 is registered by a counter 19 attached to the motor 14 and the position of the sensor 12 can thus be read directly on the counter 19. As a result, the position is directly
  • Magnet 11 or de ⁇ piston 6 can be determined.
  • the gas temperature in the gas volume 7 can also be determined by means of a temperature sensor 20.
  • the variables volume, temperature of the gas and gas pressure and the type of gas are thus available for further determination of the gas quantity.
  • an automatic device can be provided, which is connected to a pressure switch 10, the temperature sensor 20 and the counter 19 of the engine and automatically inputs its measured values, and taking into account the given gas type-dependent constants determined and, if the gas quantity falls below a predetermined lower limit, issues a warning or blocks or switches off the high-voltage circuit breaker.
  • FIGS. 2 and 3 elements that are already shown in the same form in FIG. 1 are provided with the same reference symbols.
  • the position of sensor 2 is regulated in the same way as in the embodiment according to FIG. 1.
  • the position of the sensor 12 is not registered on the motor 14 via a counter, but rather by means of a commercially available ultrasonic distance measuring device 21 which is arranged on the cylinder 1 and which detects the distance. determined to the sensor 12 or to the bracket 15 and provides for further determination of the amount of gas.
  • the position of the sensor 12 is not carried out by measuring the sensor itself, but rather by registering the commands directed to the motor 14.
  • an evaluation device 22 is provided for detecting and evaluating the control signals output by the control system 17 to the drive, in which the respective position of the sensor 12 is determined from the control signals and is available for a further determination of the gas quantity in the gas volume 7 is provided.
  • the motor 14 can be a stepper motor, for example, which is rotated further by a defined angle by means of individual actuating pulses. With such a stepper motor, a particularly precise control of the sensor 12 and a reliable registration of the movement and corresponding detection of the position of the sensor 12 are possible.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Actuator (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

Dans ce système de mesure qui permet de détecter la position d'un piston (6) mobile dans un cylindre (1) susceptible de recevoir une pression, un transmetteur de position (11), par exemple sous forme d'un aimant, est relié au piston (6) à l'intérieur du cylindre, et un capteur (12) susceptible d'être entraîné le long du trajet de déplacement du transmetteur de position (11) par un mécanisme d'entraînement (13, 14) est monté à l'extérieur du cylindre (1) et détecte l'intensité des signaux générés par le transmetteur de position (11) proportionnellement à son éloignement du transmetteur de position (11). Un régulateur (17) permet de commander le capteur (12) de sorte qu'il présente des signaux d'une intensité maximale. En détectant la position du capteur (12), on peut en conclure la position du transmetteur de position (11).
EP96945358A 1995-10-12 1996-10-11 Systeme de mesure permettant de detecter la position d'un piston Ceased EP0855014A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1995139551 DE19539551C2 (de) 1995-10-12 1995-10-12 Meßsystem und Verfahren zur Erfassung der Position eines Kolbens
DE19539551 1995-10-12
PCT/DE1996/001973 WO1997014012A2 (fr) 1995-10-12 1996-10-11 Systeme de mesure permettant de detecter la position d'un piston

Publications (1)

Publication Number Publication Date
EP0855014A2 true EP0855014A2 (fr) 1998-07-29

Family

ID=7775624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96945358A Ceased EP0855014A2 (fr) 1995-10-12 1996-10-11 Systeme de mesure permettant de detecter la position d'un piston

Country Status (4)

Country Link
EP (1) EP0855014A2 (fr)
JP (1) JP2000502178A (fr)
DE (1) DE19539551C2 (fr)
WO (1) WO1997014012A2 (fr)

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Publication number Priority date Publication date Assignee Title
DE29816156U1 (de) * 1998-09-09 1998-11-26 Festo Ag & Co Linearantrieb
FR2804210B1 (fr) * 2000-01-21 2003-08-01 Alstom Procede et dispositif pour controler la densite d'un gaz a l'interieur d'une enceinte a l'aide d'un double capteur de densite
JP2002048108A (ja) * 2000-08-04 2002-02-15 Smc Corp 位置検出センサの取付構造
FR2823803B1 (fr) * 2001-04-23 2005-11-11 Valeo Actionneur electro-hydraulique, notamment pour la commande d'un embrayage de vehicule automobile
DE10310428A1 (de) 2003-03-11 2004-09-30 Hydac Technology Gmbh Kolbenspeicher
DE10311810B3 (de) * 2003-03-12 2004-12-09 Hartmann & Lämmle GmbH & Co KG Dämpfungseinrichtung zur Dämpfung von Unter- und/oder Überdruckstößen in Leitungen und Verfahren hierfür
DE102012205363A1 (de) * 2012-04-02 2013-10-02 Marco Systemanalyse Und Entwicklung Gmbh Positionsbestimmungsvorrichtung
GB2524800A (en) * 2014-04-03 2015-10-07 Ge Oil & Gas Uk Ltd Volume sensing accumulator
EP3296574A1 (fr) * 2016-09-20 2018-03-21 Eaton SAS Accumulateur avec indicateur de niveau de liquide
DE102016122634A1 (de) 2016-11-23 2018-05-24 promethano GmbH Messvorrichtung und Messverfahren für kleine Gasvolumen
DE102020200642B3 (de) * 2020-01-21 2021-03-04 Trelleborg Sealing Solutions Germany Gmbh Kolbenspeichersystem sowie Überwachungsmodul und Überwachungsverfahren für ein Kolbenspeichersystem
CN115493073B (zh) * 2022-09-06 2023-09-15 大连大特气体有限公司 一种可准确调节气量的气体配制罐

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DE2915212C2 (de) * 1979-04-14 1986-06-19 H. Kuhnke Gmbh Kg, 2427 Malente Einrichtung zum berührungslosen Erfassen und Auswerten von insbesondere Zwischenpositionen eines in einem Arbeitszylinder verstellbaren Kolbens
JPS59175601A (ja) * 1983-03-22 1984-10-04 Hitachi Ltd 蓄圧器のピストン位置検出方法
JPS6469806A (en) * 1987-09-10 1989-03-15 Ckd Controls Piston position detecting apparatus of hydraulic cylinder
DE4018318A1 (de) * 1990-06-08 1991-12-12 Bosch Gmbh Robert Hydropneumatischer druckspeicher
DE9010114U1 (fr) * 1990-07-03 1990-09-06 Festo Kg, 7300 Esslingen, De
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Also Published As

Publication number Publication date
JP2000502178A (ja) 2000-02-22
WO1997014012A3 (fr) 1997-05-15
DE19539551A1 (de) 1997-04-17
WO1997014012A2 (fr) 1997-04-17
DE19539551C2 (de) 1997-07-17

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