EP2699806B1 - Positionneur électropneumatique - Google Patents

Positionneur électropneumatique Download PDF

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Publication number
EP2699806B1
EP2699806B1 EP12715905.1A EP12715905A EP2699806B1 EP 2699806 B1 EP2699806 B1 EP 2699806B1 EP 12715905 A EP12715905 A EP 12715905A EP 2699806 B1 EP2699806 B1 EP 2699806B1
Authority
EP
European Patent Office
Prior art keywords
valve group
electropneumatic
housing
pressure
valve
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.)
Not-in-force
Application number
EP12715905.1A
Other languages
German (de)
English (en)
Other versions
EP2699806A1 (fr
Inventor
Andre-Heinrich Meinhof
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 EP2699806A1 publication Critical patent/EP2699806A1/fr
Application granted granted Critical
Publication of EP2699806B1 publication Critical patent/EP2699806B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/005—Leakage; Spillage; Hose burst
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/87—Detection of failures
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/875—Control measures for coping with failures
    • F15B2211/8752—Emergency operation mode, e.g. fail-safe operation mode
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/885—Control specific to the type of fluid, e.g. specific to magnetorheological fluid
    • F15B2211/8855—Compressible fluids, e.g. specific to pneumatics

Definitions

  • the invention relates to an electropneumatic positioner with a supply air connection for connecting a compressed air supply line, with at least one exhaust connection for connecting a pneumatic drive of a control device and with a valve disposed in the positioner controllable valve group according to the preamble of claim 1.
  • pneumatic actuators are often used as actuators in which an on an actuator, such as a connected to a closing body lifting rod, acting membrane with the aid of a gaseous medium, for which hereinafter generally the term "air" is used with variable pressure is applied to generate movements.
  • the pressurization can take place on one side, wherein the membrane is loaded on the other side with a spring, or on two sides, with different pressures on both sides of the membrane cause the deflection.
  • the control of the pressures or by an electropneumatic positioner in which at least one controllable valve pressurized supply air distributed depending on the control via one or two exhaust ports on the one or both sides of the membrane in the actuator.
  • a two-stage pilot valve for use in an electropneumatic positioner known.
  • a first stage four flow resistances, of which at least one flow resistance is variable, are arranged in a bridge circuit.
  • Two opposite circuit points of the bridge circuit are connected to supply air or exhaust air to the environment.
  • a variable in size and sign pressure difference ready is used between the two other circuit points.
  • a valve group which has an actuated by the pressure difference control piston.
  • a pneumatic valve in the valve group is actuated, either depending on the control via the supply air supplied compressed air to the exhaust port to the actuator or derived via the same exhaust port air supplied to the outside.
  • the pneumatic drive of a control valve is connected to the exhaust air connection.
  • the drive controlled by the positioner automatically brings the process valve into a safety position, ie a safe position in the environment of the respective process, usually "open" or "close”.
  • a positioner and an actuator with such a positioner known.
  • the actuator has a seal, in particular a sliding seal
  • a leakage chamber is provided on the side of the seal which is remote from the pressure, which is connected to a pressure switch which, when a set pressure is exceeded, sends a signal to the actuator Positioner generated.
  • a seal in particular, the usual in control valves fabric bushing comes into question.
  • the signaling can be used to generate an alarm or perform a safety routine.
  • the DE 196 36 418 C2 discloses the use of a gas tight housing for a positioner.
  • the invention has for its object to provide an electropneumatic positioner, which is characterized by increased functional safety.
  • the invention has the advantage that a much larger number of possibly occurring error cases can now be classified as harmless errors.
  • the ratio between dangerous errors and non-dangerous errors is therefore much cheaper.
  • the invention is based on the recognition that material wear in seals or membranes, which are used in valves of a valve group, usually first expressed as compressed air leakage at the valves and leads to their pressure in a gas-tight housing to an increase in pressure within the housing. If there is a creeping or a sudden leak, for example if one of them breaks Membrane, within the housing, so the resulting pressure increase is detected by means of a pressure switch, which cooperates with the valves of the valve group and this controls so that the valve group is placed in a predetermined safety position.
  • valve groups in electro-pneumatic positioners are usually housed anyway in a separate housing, the invention is associated with only a small additional effort.
  • the existing housing must namely be supplemented only by a suitable housing seal.
  • the pressure monitor and the control of the valve group in order to put them in safety position when the internal pressure of the housing is too high, can be realized by electronic or electromechanical means, for example a pressure sensor with a downstream electromagnet.
  • electronic or electromechanical means for example a pressure sensor with a downstream electromagnet.
  • these are operated exclusively pneumatically, so that advantageously no electrical auxiliary energy is required for their operation, which is available only to a limited extent in particular for field instruments of process instrumentation, which are operated with a 4 to 20 mA interface.
  • the safety position is approached completely independently of the operability of the electronics of the electropneumatic positioner and thus further increases the functional safety.
  • a shutter is provided for venting the housing with a predetermined maximum air flow.
  • the housing interior is then connected via the aperture as a flow resistance with the environment of the electropneumatic positioner.
  • the aperture may be sized so that an air flow of one liter per minute leads to a pressure increase of 0.8 bar in the housing interior, in which the pressure switch responds and the valve group in the safety position.
  • an electropneumatic positioner in which the valve group is preceded by an electropneumatic converter, preferably the exhaust side of the orifice is connected to the exhaust outlet of the converter.
  • the position of the valve group by a controller electronics which is usually present in electropneumatic positioner, detectable, so that it outputs a signal indicating an error condition, for example in the form of an alarm message via a fieldbus when the valve group itself is in the safety position, but this state does not correspond to the control of the valve group by the controller electronics and any of these downstream electro-pneumatic converter.
  • an automation device or a control station as a receiver of the alarm this can be further processed and output to an operator, so that it can be initiated by this maintenance or other appropriate actions to handle the reported error condition.
  • the pneumatic positioner has a pilot valve 3 and a controller electronics 4.
  • An air supply connection 5 serves to connect a compressed air supply line 6, via which, for example, compressed air at 6 bar pressure to the pilot valve 3 is supplied.
  • the upper chamber 7 of the drive 1 is connected to an exhaust port 8 of the pilot valve.
  • a supply air valve 9 compressed air from the compressed air supply line 6 or derived from the pressure chamber 7 by means of an exhaust valve 10 via a valve outlet 11 into the environment.
  • an electropneumatic converter 12 which is designed in a known manner as a bridge circuit of flow resistances, and a booster drive 13 for actuating the supply air valve. 9 and the exhaust valve 10 in accordance with the pressure difference set by means of the electropneumatic converter 12.
  • a pressure regulator 19 By a pressure regulator 19, the supply pressure of, for example, 6 bar to a regulated pressure of, for example, 1.4 bar, which is applied to the bridge circuit of the electropneumatic converter 12, reduced.
  • a valve group of the electropneumatic positioner which consists in the embodiment shown from the supply air valve 9, the exhaust valve 10 and the booster drive 13 is disposed in a gas-tight housing 14 within the positioner.
  • a pressure switch 15 the pressure prevailing within the housing 14 is monitored for maintaining a predetermined threshold value of, for example, 0.8 bar. All free internal spaces within the gas-tight housing 14, the pressure chambers of the booster drive 13 opposite areas, the area around the valves 9 and 10, located in the valve group spring chambers and the area around the locking device of the valves 9 and 10 are pneumatically interconnected.
  • a leak such as a crack in a membrane of the booster drive 13, so escapes compressed air through the leak in the gas-tight interior of the housing 14 and leads to a pressure increase, which is detected by the pressure switch 15.
  • the pressure switch 15 As long as the pressure does not exceed a threshold value of 0.8 bar, the pressure monitor 15 does not intervene in the regulation of the position of the actuating device 2. However, as soon as the pressure rises above the limit value, the pressure monitor 15 opens the exhaust air valve 10.
  • the supply air valve 9 is closed at the same time by the locking device, not shown in the figure, so that the pressure in the pressure chamber 7 of the drive 1 drops rapidly and the actuating device 2 in the safety position, which corresponds to an "opening" of the process valve in the embodiment shown, is offset.
  • the required switching state of the valve group is also referred to as a safety position.
  • the process valve to be arranged so that it "closes" at pressure drop in the chamber 7.
  • additional components for example the electropneumatic converter 12, the pressure regulator 19 and / or the pressure monitor 15, can additionally be integrated into the housing 14.
  • a diaphragm 16 is provided, which can also be referred to as throttle or flow resistance and is connected between the interior of the housing 14 and an exhaust outlet 17 of the electropneumatic converter 12.
  • the orifice 16 is for example adjusted so that a leakage of one liter per minute leads to a pressure increase of 0.8 bar in the housing 14.
  • the pressure switch 15 therefore only responds when the air flow through the throttle 16 exceeds one liter per minute or if the exhaust port 17 of the converter 12 is clogged due to, for example, icing or soiling.
  • the current position of the valves 9 and 10 is taken into account in the controller electronics 4.
  • the controller electronics 4 In order to detect a response of the pressure switch 15 and thereby caused starting the safety position by the valve group with the valves 9 and 10, is additionally checked in the controller electronics 4, whether the position of the supply air valve 9 and the exhaust valve 10 with the by the control electronics 4 via the electro-pneumatic transducer 12 corresponds to the predetermined position.
  • a mismatch while simultaneously taking the safety position by the valve group evaluates the controller electronics 4 as a fault condition and generates a corresponding alarm message, for example, via a fieldbus 18, with which the electropneumatic positioner is integrated into an automation network of an automation system, for example, to a higher-level control station so that appropriate action can be taken to remedy it in response to the error that has occurred.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Fluid Pressure (AREA)
  • Fluid-Driven Valves (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)

Claims (4)

  1. Régleur électropneumatique de position
    ayant un raccord (5) d'air d'entrée à raccorder à un conduit (6) d'alimentation en air comprimé,
    ayant au moins un raccord (8) d'air d'échappement à raccorder à un entraînement (1) pneumatique d'un appareil (2) de réglage et
    ayant un groupe (9, 10, 13) de vannes, qui peut être commandé, qui est disposé dans le régleur de position et qui a au moins une vanne (9, 10) par laquelle, en fonctionnement normal suivant la commande du groupe de vannes, ou bien de l'air comprimé entré par le conduit d'alimentation en air comprimé peut être envoyé au raccord (8) d'air d'échappement ou bien de l'air entré par le raccord (8) d'air d'échappement peut être évacué à l'extérieur,
    caractérisé
    en ce que le groupe (9, 10, 13) de vannes qui peut être commandé est disposé dans un boîtier (14) étanche au gaz à l'intérieur du régleur de position,
    en ce qu'il y a des moyens (15) de contrôle de la pression régnant dans le boîtier et de commande du groupe (9, 10, 13) de vannes de manière à ce que le groupe (9, 10, 13) de vannes se mette, lorsque la pression dans le boîtier dépasse une valeur de seuil définie à l'avance, dans une position de sécurité donnée à l'avance et
    en ce qu'un diaphragme (16) est prévu pour la mise à l'atmosphère du boîtier (14) à un débit d'air maximum défini à l'avance.
  2. Régleur de position électropneumatique suivant la revendication 1,
    caractérisé en ce que les moyens (15) de contrôle et de commande sont réalisés pneumatiquement et sont constitués pour commander pneumatiquement le groupe (9, 10, 13) de vannes.
  3. Régleur de position électropneumatique suivant la revendication 2,
    caractérisé en ce qu'un convertisseur (12) électropneumatique est monté en amont du groupe (9, 10, 13) de vannes, et en ce que le côté d'air d'échappement du diaphragme (6) est monté à la sortie (7) d'air d'échappement du convertisseur (12).
  4. Régleur de position électropneumatique suivant l'une des revendications précédentes,
    caractérisé en ce que la position du groupe (9, 10, 13) de vannes peut être détectée par une électronique (4) de régleur et en ce que l'électronique (4) de régleur est constituée pour émettre un signal (18) indiquant un état d'erreur, lorsque le groupe (9, 10, 13) de vannes se trouve dans une position de sécurité et que celle-ci ne correspond pas à la commande du groupe (9, 10, 13) de vannes par l'électronique (4) de régleur.
EP12715905.1A 2011-04-18 2012-04-11 Positionneur électropneumatique Not-in-force EP2699806B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011007629A DE102011007629B3 (de) 2011-04-18 2011-04-18 Elektropneumatischer Stellungsregler
PCT/EP2012/056498 WO2012143265A1 (fr) 2011-04-18 2012-04-11 Positionneur électropneumatique

Publications (2)

Publication Number Publication Date
EP2699806A1 EP2699806A1 (fr) 2014-02-26
EP2699806B1 true EP2699806B1 (fr) 2016-01-06

Family

ID=45998280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12715905.1A Not-in-force EP2699806B1 (fr) 2011-04-18 2012-04-11 Positionneur électropneumatique

Country Status (5)

Country Link
US (1) US9534617B2 (fr)
EP (1) EP2699806B1 (fr)
CN (1) CN103477093B (fr)
DE (1) DE102011007629B3 (fr)
WO (1) WO2012143265A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
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DE102012017713A1 (de) * 2012-09-07 2014-03-13 Hoerbiger Automatisierungstechnik Holding Gmbh Fluidischer Stellantrieb
AR095272A1 (es) * 2013-03-14 2015-09-30 Fisher Controls Int Llc Pronóstico de válvula en función de análisis de laboratorio
DE102015207121A1 (de) * 2015-04-20 2016-10-20 Rwe Power Aktiengesellschaft System zur Regelung des Drucks an einem Überdruckbehälter mit Inertgasatmosphäre
US10060552B2 (en) * 2016-05-18 2018-08-28 Saudi Arabian Oil Company Adaptive high integrity ESD system
DE102017117335A1 (de) * 2017-07-31 2019-01-31 Bürkert Werke GmbH & Co. KG Betätigungseinheit für ein Prozessventil sowie Prozessventil

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Also Published As

Publication number Publication date
DE102011007629B3 (de) 2012-09-27
CN103477093A (zh) 2013-12-25
US20140060029A1 (en) 2014-03-06
EP2699806A1 (fr) 2014-02-26
WO2012143265A1 (fr) 2012-10-26
CN103477093B (zh) 2015-11-25
US9534617B2 (en) 2017-01-03

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