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WO1998002685A1 - Dispositif de controle automatique de mecanismes pneumatiques d'entrainement et regulateurs de position pourvus de ce dispositif - Google Patents

Dispositif de controle automatique de mecanismes pneumatiques d'entrainement et regulateurs de position pourvus de ce dispositif Download PDF

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Publication number
WO1998002685A1
WO1998002685A1 PCT/DE1997/001487 DE9701487W WO9802685A1 WO 1998002685 A1 WO1998002685 A1 WO 1998002685A1 DE 9701487 W DE9701487 W DE 9701487W WO 9802685 A1 WO9802685 A1 WO 9802685A1
Authority
WO
WIPO (PCT)
Prior art keywords
positioner
drive element
drive
time
self
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
PCT/DE1997/001487
Other languages
German (de)
English (en)
Inventor
Klaus-Peter Heer
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of WO1998002685A1 publication Critical patent/WO1998002685A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
    • F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters

Definitions

  • the invention relates to a device for self-testing pneumatic drives according to the preamble of claim 1 and a positioner with such a device.
  • a pneumatic drive is known from published patent application DE 36 37 068 AI. It is provided with a drive housing, a diaphragm plate movably mounted in it, rigidly connected to a drive rod, which can be pressurized with compressed air on one side, a spring arranged on the diaphragm plate against the action of the compressed air and arranged inside the drive housing, a position meider, who detects the position of the diaphragm plate, and with a valve for adjusting the air pressure on the diaphragm plate.
  • a device for the self-test of the pneumatic drive is not described in the cited publication.
  • the SIPART PS electropneumatic positioner from Siemens AG is used to control the position of a connected actuator, such as a valve or flap position, on pneumatic linear or part-turn actuators.
  • a process controller or control system specifies a setpoint for the positioner via an interface, for example a digital Profibus connection or an analog 4-20 mA input, and the positioner then forces a corresponding corresponding setpoint on the actuator Position.
  • the pressure in one drive chamber or, in the case of double-acting drives, in both drive chambers is changed until the predetermined position of the actuator is reached.
  • the current position is detected with a displacement sensor, for example a conductive plastic potentiometer, and an actual value signal generated with the displacement sensor is fed to a microcontroller together with the setpoint.
  • One valve is in the supply air branch to increase the air pressure in the chamber, another valve in the exhaust air branch and opens when the chamber is to be vented.
  • This positioner has many special functions integrated, for example an alarm message is issued if a control valve is blocked or the air pressure in the supply network is too low. Further information on the SIPART PS positioner can be found, for example, in an information document published by Siemens AG with the order number E80001-V0343-A020.
  • Single-acting pneumatic drives generally have several springs, which provide the counterforce to the pneumatic drive force required to reset the drive. If a spring breaks or the force of the springs diminishes over time due to corrosion, the drive will continue to work, but it may not be possible to ensure that a control valve operated with it is sealed. A further disturbance, e.g. B. if a spring breaks or the valve friction high, can lead to a total failure with serious consequences, since the drive may no longer be able to close a valve tightly in an emergency. Such failures have to be avoided through routine, preventive maintenance work, which is very complex.
  • the invention has for its object to provide a device for the self-test of pneumatic drives, which enables early detection of damage with little effort, and to provide a positioner with such a device.
  • the new device of the type mentioned at the outset has the features specified in the characterizing part of claim 1 and the new positioner has the features specified in the characterizing part of claim 3.
  • Advantageous embodiments are described in the dependent claims.
  • the invention has the advantage that, in addition to the position indicator and valve required in any case for a positioner for pneumatic drives, no additional sensors or actuators are required to adjust the air pressure.
  • the new device takes advantage of the fact that if a spring fails or the spring force is reduced due to corrosion, a lower back pressure in the air pressure chamber is required for a balance of forces. If a setpoint jump for a lower back pressure is specified, a valve for supplying or discharging compressed air to the pressure chamber must also be actuated for a shorter time because due to the reduced spring constant, only a smaller change in pressure has to be generated. This reduces the response time of the drive element to valve actuation, ie the new setpoint is reached more quickly.
  • a direct measurement of the spring force to diagnose the spring condition would be complex since it would require special force sensors in the drive housing.
  • a poor condition of the springs could also be identified by comparing a measured pressure / displacement characteristic with a reference characteristic.
  • a pressure transmitter and an evaluation device with an additional analog input would have to be provided for this diagnostic option.
  • a force or pressure transmitter is not necessary in the device according to the invention.
  • the start-up time can advantageously be evaluated for the self-test of pneumatic drives, ie the time which elapses in a previously depressurized chamber after opening the supply valve until a drive movement begins.
  • the start and end pressure in the chamber are low and thus the difference between the air pressure in the supply network and the air pressure in the pressure chamber of the drive housing is maximum, so that fluctuations in the air pressure in the supply network have relatively little effect on the time measurement and this diagnostic method is almost independent of the supply pressure. Since the pressure difference changes only slightly during the time during which a gas stream flows from the supply network into the chamber, and the ratio of network pressure to chamber pressure is greater than the critical pressure ratio required for Air is about 2, the gas flow is also largely constant.
  • the drive element is still stationary, the pressure and thus the resulting force on the springs increase linearly over time with a constant chamber volume.
  • the start-up time until a movement of the drive element begins is therefore approximately proportional to the spring preload and almost independent of the pressure in the supply lines of the compressed air network.
  • the device for the self-test can be implemented both with a hardware circuit and with software in a digital, microprocessor-controlled positioner.
  • the implementation with a positioner has the advantage that no additional circuit parts are required, since time measuring devices are usually present as so-called timers in microprocessors.
  • time measuring devices are usually present as so-called timers in microprocessors.
  • a reaction time can be measured and saved as a reference value for a later self-test.
  • This has the advantage that a positioner automatically adapts to different actuators, which may have different start-up times, without an operator having to enter these start-up times.
  • FIG. 1 shows a block diagram of a drive with positioner and FIG. 2 shows a time diagram to explain the start-up time.
  • a pneumatic drive has a drive housing 1 in which a drive element, here a diaphragm plate 2, is movably mounted.
  • the drive element 2 is connected to a push rod 3, which is used to actuate, for example, a control valve not shown in FIG. 1.
  • the underside of the diaphragm plate 2 forms, together with the lower part of the drive housing 1, a pressure chamber 7, which can be aerated via a feed line 8 and vented via a discharge line 15.
  • a force Fu acts on the underside of the diaphragm plate 2.
  • a position indicator 9 is provided, which is coupled to the push rod 3 via a position tap and supplies an electrically evaluable position signal 10 to a positioner 11.
  • the positioner 11 opens or closes a piezo valve 12, which on one side has a line 13 of a compressed air supply network and the other side of which is connected to the feed line 8. If necessary, a further valve 14 can be provided for quick ventilation, which opens or closes the discharge line 15 to the surroundings.
  • a display 16 is connected to the positioner 11 and serves to output current position values and error messages in the event of an error. In addition, test results can be displayed to a higher-level process control system via a bus interface, which is not shown in FIG. 1.
  • the pneumatic drive Since the pneumatic drive is pressed into its end position due to the prestressing of the springs 4, 5 and 6, it remains there until the moment tl there is a balance of forces between the forces Fo on the upper side and the force Fu on the lower side of the diaphragm plate 2. With further supply of compressed air, the diaphragm plate 2 begins to move away from its end position, since the force Fu on the underside is greater than the preload Fv of the springs 4, 5 and 6. This beginning movement is detected by the position indicator 9 and the positioner 11 , which stops an internally running time measurement at the start of a movement. The time between opening the valve 12 at the time tO and the onset of movement of the push rod 3 at the time t1 is evaluated as the starting time ta.
  • the measured value of the start-up time ta is stored in a memory within the positioner 11. Start-up times measured during later operation of the pneumatic actuator are compared with this stored reference value and monitored for impermissible deviations. If the start-up time has decreased considerably compared to the reference value, this is an indication of corroded or broken springs in the drive.
  • the positioner 11 can similarly monitor the positional speed of the pneumatic drive and compare it with a speed / position characteristic curve stored as a reference. If the effect of the springs 4, 5 and 6 declines over time due to wear, then a predetermined change in position is achieved after a shorter opening time of the valve 12 or the valve 14, i. that is, the positioning speed increases.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Servomotors (AREA)
  • Fluid-Driven Valves (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

Dans le dispositif décrit, le temps (ta) que prend un élément d'entraînement (2) pour réagir à une commande de soupape est comparé à une valeur enregistrée de référence et un résultat d'essai est dérivé de la déviation détectée. On peut en tirer des conclusions sur l'état des ressorts (4, 5, 6) dans le boîtier (1) du mécanisme d'entraînement. L'invention est utile dans des régulateurs pneumatiques de position.
PCT/DE1997/001487 1996-07-16 1997-07-14 Dispositif de controle automatique de mecanismes pneumatiques d'entrainement et regulateurs de position pourvus de ce dispositif Ceased WO1998002685A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29612346U DE29612346U1 (de) 1996-07-16 1996-07-16 Einrichtung zum Selbsttest pneumatischer Antriebe sowie Stellungsregler mit einer derartigen Einrichtung
DE29612346.3 1996-07-16

Publications (1)

Publication Number Publication Date
WO1998002685A1 true WO1998002685A1 (fr) 1998-01-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/001487 Ceased WO1998002685A1 (fr) 1996-07-16 1997-07-14 Dispositif de controle automatique de mecanismes pneumatiques d'entrainement et regulateurs de position pourvus de ce dispositif

Country Status (2)

Country Link
DE (1) DE29612346U1 (fr)
WO (1) WO1998002685A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011002560A1 (fr) * 2009-07-02 2011-01-06 Fisher Controls International Llc Dispositif et procédé pour déterminer un mode défaillance d'un ensemble soupape de régulation pneumatique
DE102011111043A1 (de) 2011-08-19 2013-02-21 Abb Technology Ag Verfahren zum Selbsttest pneumatischer Antriebe
WO2019238519A1 (fr) * 2018-06-11 2019-12-19 Hoerbiger Flow Control Gmbh Vanne de sécurité
EP3851715A1 (fr) * 2020-01-20 2021-07-21 SISTO Armaturen S.A. Système de fonctionnement d'un dispositif pneumatique

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8036837B2 (en) 2008-02-29 2011-10-11 Fisher Controls International Llc Diagnostic method for detecting control valve component failure
DE102009052631B4 (de) * 2009-11-10 2013-05-29 Abb Technology Ag Verfahren zur Erhöhung der Verfügbarkeit von Weg-/Positionsmesssystemen auf Basis von Potentiometern mit Schleiferabgriff (III)
DE102015225999A1 (de) * 2015-12-18 2017-06-22 Siemens Aktiengesellschaft Verfahren zum Überprüfen des Zustandes eines Ventils
DE102020120696A1 (de) * 2020-08-05 2022-02-10 Samson Aktiengesellschaft Federbrucherkennung in einem vorgespannten Antrieb eines Stellventils
DE102022114745B3 (de) 2022-06-10 2023-07-20 Samson Aktiengesellschaft Verhindern von regelungsbedingten Schwingungen der Position eines Ventilglieds bei einem Ventil mit pneumatischem Antrieb
EP4455521A1 (fr) * 2023-04-28 2024-10-30 Tetra Laval Holdings & Finance S.A. Procédé de détermination d'un état d'un actionneur pneumatique, système de commande, agencement de soupape et machine de manipulation d'aliments

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2637068A1 (de) 1975-08-19 1977-02-24 Tokico Ltd Scheibenbremse
JPS62229044A (ja) * 1986-03-31 1987-10-07 Toshiba Corp 空気作動式オン・オフ弁の異常診断装置
DE3637068A1 (de) * 1986-04-08 1987-12-23 Samson Ag Pneumatische antriebsvorrichtung fuer stellgeraete oder dergleichen
WO1993024779A1 (fr) * 1992-06-03 1993-12-09 Siemens Aktiengesellschaft Procede et dispositif visant a verifier une garniture actionnee par un milieu
JPH06129403A (ja) * 1992-10-21 1994-05-10 Yokogawa Electric Corp バルブポジショナ
US5329956A (en) * 1993-05-28 1994-07-19 Combustion Engineering, Inc. Pneumatic operated valve stroke timing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2637068A1 (de) 1975-08-19 1977-02-24 Tokico Ltd Scheibenbremse
JPS62229044A (ja) * 1986-03-31 1987-10-07 Toshiba Corp 空気作動式オン・オフ弁の異常診断装置
DE3637068A1 (de) * 1986-04-08 1987-12-23 Samson Ag Pneumatische antriebsvorrichtung fuer stellgeraete oder dergleichen
WO1993024779A1 (fr) * 1992-06-03 1993-12-09 Siemens Aktiengesellschaft Procede et dispositif visant a verifier une garniture actionnee par un milieu
JPH06129403A (ja) * 1992-10-21 1994-05-10 Yokogawa Electric Corp バルブポジショナ
US5329956A (en) * 1993-05-28 1994-07-19 Combustion Engineering, Inc. Pneumatic operated valve stroke timing

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
HEER, K-P: "Elektropneumatische Stellungsregler für optimale Reglerergebnisse", April 1993, SIEMENS, KARLSRUHE (DE), XP002045357 *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 095 (P - 681) 29 March 1988 (1988-03-29) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 432 (M - 1654) 11 August 1994 (1994-08-11) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011002560A1 (fr) * 2009-07-02 2011-01-06 Fisher Controls International Llc Dispositif et procédé pour déterminer un mode défaillance d'un ensemble soupape de régulation pneumatique
CN102472408A (zh) * 2009-07-02 2012-05-23 费希尔控制国际公司 用于确定气动式控制阀组件的故障模式的装置与方法
US8312892B2 (en) 2009-07-02 2012-11-20 Fisher Controls International Llc Device and method for determining a failure mode of a pneumatic control valve assembly
DE102011111043A1 (de) 2011-08-19 2013-02-21 Abb Technology Ag Verfahren zum Selbsttest pneumatischer Antriebe
WO2019238519A1 (fr) * 2018-06-11 2019-12-19 Hoerbiger Flow Control Gmbh Vanne de sécurité
CN112074680A (zh) * 2018-06-11 2020-12-11 贺尔碧格流量控制有限责任公司 安全阀
KR20210019989A (ko) * 2018-06-11 2021-02-23 회르비거 플로우 컨트롤 게엠베하 안전 밸브
US11555555B2 (en) 2018-06-11 2023-01-17 Hoerbiger Flow Control Gmbh Safety valve
KR102653987B1 (ko) 2018-06-11 2024-04-02 회르비거 플로우 컨트롤 게엠베하 안전 밸브
EP3851715A1 (fr) * 2020-01-20 2021-07-21 SISTO Armaturen S.A. Système de fonctionnement d'un dispositif pneumatique

Also Published As

Publication number Publication date
DE29612346U1 (de) 1997-08-14

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