EP2638297A1 - Entraînement hydraulique ou pneumatique pour l'actionnement d'un appareil de robinetterie comportant une soupape de réglage ou de commande - Google Patents

Entraînement hydraulique ou pneumatique pour l'actionnement d'un appareil de robinetterie comportant une soupape de réglage ou de commande

Info

Publication number
EP2638297A1
EP2638297A1 EP11782040.7A EP11782040A EP2638297A1 EP 2638297 A1 EP2638297 A1 EP 2638297A1 EP 11782040 A EP11782040 A EP 11782040A EP 2638297 A1 EP2638297 A1 EP 2638297A1
Authority
EP
European Patent Office
Prior art keywords
valve
valves
way cartridge
cylinder
hydraulic
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
EP11782040.7A
Other languages
German (de)
English (en)
Other versions
EP2638297B1 (fr
Inventor
Hans-Juergen Finke
Meik Brinkmann
Dirk Bracht
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.)
Robert Bosch GmbH
Uniper Technologies GmbH
Original Assignee
Robert Bosch GmbH
EOn Engineering 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 Robert Bosch GmbH, EOn Engineering GmbH filed Critical Robert Bosch GmbH
Publication of EP2638297A1 publication Critical patent/EP2638297A1/fr
Application granted granted Critical
Publication of EP2638297B1 publication Critical patent/EP2638297B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits 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
    • 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
    • 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
    • F15B20/008—Valve failure
    • 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
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0405—Valve members; Fluid interconnections therefor for seat valves, i.e. poppet valves
    • 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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • F15B2211/7054—Having equal piston areas
    • 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
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
    • F15B2211/8636—Circuit failure, e.g. valve or hose failure
    • 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
    • F15B2211/8757—Control measures for coping with failures using redundant components or assemblies

Definitions

  • Hydraulic or pneumatic actuator for actuating a valve with a control or switching valve
  • the invention relates to a hydraulic or pneumatic (fluidic) drive, which is provided for the actuation of valves having a switching or control valve, and comprises a control cylinder and a safety circuit, in a line to which a cylinder chamber of the actuating cylinder
  • valve is connected, two in series with each other connected shut-off valves.
  • the valve can be used, for example, in a power plant, in the chemical or petrochemical industry, in oil and gas production, etc. Fittings are for example auxiliary operated safety valves, quick-acting valves, quick-opening valves, control valves, quick-acting flaps, pilot valves, self-medium controlled
  • Insulating valves in power plants valves for mixing the same or different substances, etc.
  • a hydraulic safety circuit for a double-acting hydraulic cylinder with two pressure chambers is known in which in the case of an emergency shutdown, the two pressure chambers are connected to each other via a plurality of mutually parallel pilot operated seat valves.
  • the pilot control is supplied either via a check valve from the pressurized chamber of the hydraulic cylinder or via a check valve from an external pressure source.
  • this safety circuit it can be tolerated if one of the parallel-connected poppet valves fails during the quick shutdown.
  • the two parallel fluid paths are provided for redundancy in the event of a quick shutdown of a steam valve.
  • the series connection of two safety valves makes it possible to individually test them during operation for their functionality.
  • a disadvantage of such safety circuits is that each passive logic valve can only be tested together with the active logic valve of the parallel line.
  • a connecting line with a throttle is provided between the two parallel lines.
  • the invention is based on the object to provide a hydraulic or pneumatic (fluidic) drive for the actuation of valves with a switching or control valve having the features of the preamble of claim 1 and in which the safety-related function of
  • shut-off valves can also be tested individually at any time without the safety circuit or the control valve or the system having to be taken out of service.
  • the fluidic drive according to the invention can be used in particular for actuating a regulating or switching valve of a valve, for example in a power plant.
  • the drive has an actuating cylinder which has at least one cylinder chamber which is connected to a hydraulic or pneumatic line. In the line a safety circuit is provided, the two connected in series
  • the two shut-off valves are a first 2/2-way cartridge valve (logic valve) and a second 2/2-way cartridge valve (logic valve), each with a main control piston through which the fluidic connection between two respective working ports of a cartridge valve is controllable.
  • the two 2/2-way cartridge valves each have a pilot valve.
  • the second 2/2-way cartridge valve is fluidly closer to the cylinder chamber arranged as the first 2/2-way cartridge valve.
  • At least this first 2/2-way cartridge valve is an active logic valve, which has an active area in the opening direction, via the associated
  • pressure can be applied to the pilot valve.
  • One of the two cartridge valves can be designed as a passive logic valve without active surface, as at one of his
  • Working ports serially arranged for a cartridge valve other cartridge valve is an active logic valve.
  • the pilot valves of the two 2/2-way cartridge valves are connected to their with a pressure medium source and with a pressure medium sink
  • the active-logic valve with the area active in the opening direction is preferably the 2/2-way cartridge valve, at the working ports of which no pressure is present in normal operation.
  • this cartridge valve can be switched to test over the active area - in particular - be opened.
  • both 2/2-way cartridge valves are active logic valves. This has the advantage that the
  • valve block having the logic valves can also be interchanged with respect to the actuating cylinder with respect to the actuating cylinder to be connected to the actuating cylinder.
  • selection valve arrangements in the form of, for example, two check valves or a so-called shuttle valve that the Pilot valves are supplied in each case from the pressurized cylinder chamber with pressure medium and connected to their tank port to the cylinder chamber with the lower pressure, so there is an additional security with regard to the assembly.
  • the actuating cylinder is a synchronous cylinder with a second cylinder chamber.
  • the two cylinder chambers can be connected to one another via the line and via the two 2/2-way cartridge valves. It can then be displaced from the pressurized cylinder chamber, the pressure medium in the other cylinder chamber, so that the valve under the influence of pressure conditions can reach her in a safe position.
  • the actuating cylinder also has a second cylinder chamber and is therefore also double-acting.
  • Stellzylinder can also be a Gleichgangzylinder.
  • a synchronous cylinder is a cylinder in which the two cylinder chambers are facing equally large effective piston surfaces.
  • a second hydraulic line is connected, in which a second safety circuit is provided.
  • This is designed in accordance with the first safety circuit and has the accordingly a third 2/2-way cartridge valve and a fourth 2/2-way cartridge valve connected in series.
  • These each include a main control piston, with which the fluidic connection between two respective working ports is controllable, and a pilot valve.
  • At least one, preferably both 2/2-way cartridge valves of the second safety circuit are active logic valves having an active in the opening direction surface, which is acted upon by the associated pilot valve independent of the working ports with a pressure. In this case, a test of the cartridge valves of a line is independent of the installation valves of the other line and regardless of whether a pressure is present at a working port of the third and / or fourth 2/2-way cartridge valve.
  • the active logic valve with the active in the opening direction surface is the 2/2-way cartridge valve, at its working ports in normal operation no pressure is present.
  • this cartridge valve can be switched to test over the active area - in particular - be opened.
  • a branching line can be connected to a further 2/2-way cartridge valve to the first and to the second line between the two cartridge valves.
  • These cartridge valves also each have a main control piston, with which the fluidic connection between two respective working ports is controllable, and they each have a pilot valve. With such a hydraulic drive, the actuating cylinder can be adjusted in emergency operation as needed in a first or in a second direction.
  • the operation of the 2/2-way cartridge valves can be easily tested.
  • the closed position and the open position of a 2/2-way cartridge valve are monitored.
  • a position sensor is used for position monitoring, for example in the form of an analogue encoder, with which each position of a main control piston can be detected, for example stop strokes can be used to detect differently set opening strokes of a main control piston without a limit switch also having to be readjusted. Only one other signal from the position transmitter can be regarded as authoritative electronically.
  • the pilot valves position monitoring valve body.
  • the position monitoring can be carried out by means of limit switches.
  • the main control pistons have seals.
  • these seals can be arranged in particular between the spring chamber and the active surface.
  • the pilot valves are 4/2 directional seat valves.
  • the spring chamber of the associated cartridge valve acted upon in the closing direction acting control pressure while the active surface to be relieved.
  • emergency mode can Relieved via the 4/2-way poppet valve (reversed) the spring chamber and the active surface are acted upon by acting in the opening direction control pressure. It is preferred in this case if the first-mentioned fluidic connections take place in the case of an energized switching position and the second-named fluidic connections in the case of a currentless basic position of the 4/2-way seat valve.
  • all 2/2-way cartridge valves are active logic valves having an active in the opening direction surface, which is acted upon by the associated pilot valve independent of the working ports with a pressure. This allows each cartridge valve to be tested without pressure on any of its working ports. This increases the flexibility of the safety circuit and reduces the effects of a faulty assignment of the installation valves during assembly. Due to the pressurization of the additional effective in the opening direction open the active logic valves very fast.
  • a position sensor is arranged on a piston or on a piston rod of the actuating cylinder.
  • the actuator cylinder is actuated independently of the 2/2-way cartridge valves via a proportional or black / white directional control valve.
  • a seat valve (blocking valve) is provided as a safety valve, with which the actuating cylinder and thus the valve can be kept leak oil-free in a predetermined position.
  • the directional control valve and the blocking valve are actuated and the actuating cylinder, powered by a pressure connection and a tank connection, moved.
  • this system not only checks the function itself, but also detects changes that creep over a longer time Period could result (condition monitoring). By monitoring the proportional valve or the black / white directional control valve and the blocking element, the actual work elements are included in the review.
  • Proportional valve or the black / white directional control valve returned to the higher-level control.
  • the verification of the valve function and all elements and signals involved is fully documented and archived.
  • a real movement on the actuator cylinder may only play in the
  • Valve spindle is playing.
  • safety blocks are arranged parallel to one another, then the safety blocks remain in function when checking a safety block in order to ensure safety.
  • a first variant of the safety circuit according to the invention has a control cylinder, via which a main valve in an emergency (but possibly not only in an emergency) can be relieved hydraulically or pneumatically, wherein - in particular for what - the actuating cylinder has a first cylinder chamber and a second cylinder chamber which are connectable to each other via a working line.
  • a first and a second series-connected shut-off valve are provided in the Working line.
  • the actuating cylinder may be, for example, a differential or synchronous cylinder.
  • a second variant of the safety circuit according to the invention has a control cylinder, via which a main valve in an emergency (-aber possibly not only in an emergency) can be actuated hydraulically or pneumatically, wherein the actuating cylinder has a first cylinder chamber, in particular via a first pressure medium flow path via a first working line - can be supplied with pressure medium.
  • a first and a second series-connected shut-off valve are provided in the first pressure medium flow path - in particular in the first working line - .
  • the actuating cylinder may e.g. be a differential or synchronous cylinder with two cylinder chambers.
  • one of the two shut-off valves can be tested while the other shut-off valve remains closed. Neither the valve nor the system needs to be taken out of service.
  • a method for switching a safety circuit according to the invention according to one of the two variants in an emergency has the steps:
  • the second variant of the actuating cylinder has a second cylinder chamber, which is relieved via a second working line.
  • a first and a second series-connected shut-off valve are provided in the second working line.
  • the second variant of the actuating cylinder has a second cylinder chamber, which is supplied via a second pressure medium flow path with pressure medium accordingly.
  • the first and the second cylinder chamber via the respective pressure medium flow path alternatively - in particular to a tank - relieved.
  • a first and a second series-connected shut-off valve are provided in the second pressure medium flow path.
  • a method for switching this training in an emergency has the steps:
  • shut-off valves may be provided, of which two are working shut-off valves, which are connected directly to the two cylinder chambers and two of which are P shut-off valves, both directly to a
  • the pressure circuit is connected to the safety circuit and two of which are T shut-off valves, both of which are directly connected to a tank connection of the safety circuit.
  • a method for switching this training in an emergency has the steps:
  • the series-connected shut-off valves are respectively formed by logic valves or 2/2-way poppet valves having a valve body having a closing direction effective closing surface and an effective in the opening direction annular surface.
  • the closing surface and the annular surface are both alternatively - in particular to the tank - relieved or with pressure medium
  • logic valves or the 2/2-way poppet valves in each case by a 4/2-way valve - are piloted - especially in the seat design.
  • the currentless switching to the emergency operation of the safety circuit so the opening of the main valve can be done when the 4/2-way valve a valve body has, in its biased by a spring emergency position in the closing direction effective closing surface - in particular to the tank - is relieved, while in the opening direction effective annular surface is acted upon with pressure medium.
  • the main valve is a shut-off valve or a safety valve of a system under vapor pressure.
  • the method according to the invention for maintaining or maintaining such a safety circuit has the following steps:
  • each shut-off valve can be kept practicable, without causing the actuating cylinder and thus the main valve adjusted so it must be opened.
  • Figure 1 is a circuit diagram of a valve assembly of a hydraulic actuator for a valve having a control or switching valve, to which circuit diagram, the safety circuits shown in the following figures are connected;
  • Figure 2 is a circuit diagram of a first embodiment of a security circuit according to the invention.
  • Figure 4 is a circuit diagram of a second embodiment of the safety circuit according to the invention.
  • FIG. 5 shows a safety valve or control valve with differential cylinder of a third embodiment of the safety circuit according to the invention
  • FIG. 6 shows a safety valve or control valve with differential cylinder of a fourth embodiment of the safety circuit according to the invention.
  • FIG. 7 shows a circuit diagram of a fifth exemplary embodiment of the safety circuit according to the invention.
  • FIG. 8 shows a circuit diagram of a sixth embodiment of the safety circuit according to the invention.
  • Figure 1 shows a circuit diagram of a valve assembly of a hydraulic drive, at its designated A1 and B1 ports each directly a working chamber 4; 204 and 6, respectively; 206 of a double-acting actuator cylinder 2 (shown in FIGS. 2 and 4 to 8); 202 are connected.
  • the adjusting cylinder 2; 202 serve to set a respective safety valve or control valve 1; 101; 401 of a fitting.
  • Such a control valve 1; 101; 401 is for example a steam valve, which in a
  • Normal operation can take intermediate positions to control the steam flow.
  • the valve may also be a switching valve, which is closed or open in normal operation and should take in certain situations in its second position. Apart from steam, however, it is also possible to control the flow of another medium, which is transported in the same way or changed in its parameters (for example by mixing).
  • valve arrangement of the hydraulic drive shown in FIG. 1 supplies one of the ports A1, B1 with a pressurized fluid (oil, air, gas or gas mixture) which is available at one pump port P, while the other of the two ports A1, B1 connects to a tank connection T.
  • a proportional (continuously) adjustable 4/3 way valve 26 is arranged, via which the pressurization of the terminals A1, B1 and thus the positioning of the control valve. 1 ; 101; 401 takes place.
  • the proportional valve 26 via a pump line 28 to the
  • a valve spool of the proportional valve 26 can be detected with a displacement sensor 31.
  • An output of the proportional valve 26 is connected via a working line 32 to the port A1, while a second port of the proportional valve 26 is connected via a second working line 34 to the port B1.
  • a seat valve 36 is arranged, via which the two working lines 32, 34 can be shut off.
  • the seat valve 36 serves to the adjusting cylinder 2; 202 in case of failure of the electrical system or a safety check in any position of the control valve 1; 101; 401 leak-free to keep in a predetermined position.
  • the proportional valve 26 serving as the main directional valve and the poppet valve 36 serving as the safety blocking element are actuated and the actuating cylinder 2; 202 proceed.
  • the control of the actuating cylinder can also take place via a switching valve shown in FIG.
  • FIG. 2 shows a circuit diagram of a first exemplary embodiment of a safety circuit according to the invention. It has a safety valve or control valve 1, which is in an emergency to relieve a (not shown) system that is under vapor pressure.
  • the safety valve or control valve 1 has a valve body, which is held in a normal operation of the system against the vapor pressure to a valve seat and is lifted in an emergency in the position shown in Figure 2).
  • the pressure of the steam is supportive.
  • For the actuation of the control valve 1 is a synchronous cylinder 2 with the two in the free cross section of the same size
  • Cylinder chambers 4 and 6 are present, wherein by supplying pressurized fluid into the
  • Outflow of pressurized fluid from the cylinder chamber 6 is actuated in the opening direction.
  • the pressure in the cylinder chamber 6 results from the pressure in the
  • Gleichgangzylinders 2 connectable via a working line, from the
  • Work line sections 8a, 8b, 8c, 8d, 8e and 8f consists.
  • a position sensor 21 is arranged on a piston rod of the actuating cylinder 2.
  • a first logic valve 12 is provided, while between the two working line sections 8d and 8e, a second logic valve 14 is provided.
  • the two according to the invention in series logic valves 12, 14 are 2/2-way seat valves and shown in Figure 2 in a normal or basic position. Both logic valves 12, 14 block the working line 8a-f, whereby the safety valve or control valve 1 can be controlled solely by way of the valve arrangement of FIG.
  • For switching the two logic valves 12, 14 between normal operation and emergency operation serve as a pilot control a first 4/2-way valve 16 and a second 4/2-way valve 18.
  • the two logic valves 12, 14 and the two 4 / 2- Directional valves 16, 18 are arranged together in and on a control plate 20 having a pump port P and a tank port T.
  • the two 4/2-way valves 16, 18 are shown in their biased by a spring basic or emergency position.
  • a respective closing surface 22, 24 which is effective in the closing direction of the valve body or main control piston of the logic valves 12, 14 is connected to the tank connection T via a relief line and thus relieved of pressure.
  • the discharge in particular if no tank connection is present or a tank connection is present, but not used and closed by a stopper, via a check valve 21a also to the cylinder chamber 4 or via a check valve 21 b to the cylinder chamber 6 take place, depending on the in which cylinder chamber the lower pressure prevails.
  • the respectively effective in the opening direction annular surfaces A4 of the logic valves 12, 14 are alternatively from a pump port P forth via a first check valve 23a or from the cylinder chamber 6 via a second check valve 23b or from the cylinder chamber 4 ago a third check valve 23c is pressurized.
  • the valve body or main control piston of the two logic valves 12, 14 are lifted and the working line 8a-f released.
  • the two cylinder chambers 4, 6 of the synchronous cylinder 2 are connected and the valve body of the safety valve or control valve 1 can be opened in the position shown in Figure 2.
  • the surfaces 22 are pressurized and the surfaces A4 relieved of pressure.
  • the logic valves are shown together with their pilot control in the rest position, which they occupy when there is no pressure in the system.
  • the pilot valves 16 and 18 are thus - unlike the main stages - arranged in parallel with respect to their pressure and in terms of their tank connection and therefore can independently control their main stages.
  • the 4/2 way valves 16 and 18 may also be designed as 4/2 way seat valves. Then a leakage oil flow on the feedforward is not available or very small.
  • 4/2 way seat valves are known for example from the data sheet RD 22058 / 07.09, page 5/14 Bosch Rexroth AG
  • the tank connection T may be omitted or unused and blocked.
  • the pressure port P together with the check valve 25a may be omitted or clogged by dispensing with the provision of a check valve.
  • each of the cylinder chamber 6 is pressurized.
  • the pressure in the cylinder chamber 4 is lower than in the cylinder chamber. 6
  • the check valves 25b and 25c and 21 a and 21 b would not be necessary.
  • the respective pressure connection of the two pilot valves 16 and 18 could be connected directly only to the cylinder chamber 6 and the respective discharge connection directly to the cylinder chamber 4. This is also conceivable if, as shown in FIG. 2, the tank connection T and the pressure connection P with the check valve 25a available. In the cylinder chamber 4 would then prevail the same pressure as in the tank connection T. The pressure at the pressure port P would usually be lower than in
  • Figure 3 shows the logic valve 12/14 with the pilot valve 16/18 of Figure 2 in an enlarged view and with additional details. This arrangement is also repeatedly installed in the following embodiments.
  • the logic valve 12/14 is an active logic valve 12/14, the main control piston acting in the opening direction and independently of the pressure at one of the terminals A and B with pressurizable annular surface or active area A4 and in
  • Closing direction effective closing surface has 22/24.
  • a seal 38 is arranged to delimit the two adjacent spaces in which there are different pressures both in normal operation and in emergency operation.
  • the active area A4 of the logic valve 12 is also for the initiation of a
  • the valve body of the pilot valve 16/18 and the main control piston of the active-logic valve 12/14 are position-monitored via a respective limit switch 40 or 42.
  • the limit switch 40 detects whether the valve body of a pilot valve has reached its switched position.
  • the limit switch 42 detects whether the piston of
  • Main stage of a logic valve has reached its open end position. It can also in each case a second limit switch may be provided in order to detect both end positions in each case.
  • a second limit switch 43 is shown, with which the closed position of the main stage of the logic valve is monitored.
  • a continuous path detection can be provided, so that different open end positions without mechanical adjustment of a
  • FIG. 4 shows a circuit diagram of a second exemplary embodiment of a safety circuit according to the invention.
  • a valve body of a safety valve or control valve 101 in normal operation is a valve body of a safety valve or control valve 101 in normal operation
  • the vapor pressure of the system acts in the closing direction supportive. Compared to the embodiment of Figure 2 so the flow direction of the steam is reversed by the valve.
  • the first cylinder chamber 4 of the synchronizing cylinder 2 can be connected via a first working line to the pressure port P of a control plate 120.
  • the first working line is divided into sections 108a, 108b, 108c, 108d, 108e and 108f. Between the two sections 108e and 108d, a first logic valve 12 is arranged, while a second logic valve 14 is arranged between the two sections 108d and 108c.
  • the second cylinder chamber 6 of the Gleichgangzylinders 2 is connected via a second working line to the tank port T of the control plate 120.
  • the second working line is divided into the sections 1 10a, 1 10b, 1 10c, 110d, 110e and 110f.
  • a third logic valve 15 is arranged, while a fourth logic valve 13 is arranged between the two sections 11 1 Od and 110e. All logic valves are active logic with a designated in Figure 3 with A4 ring surface on the piston, which acts on pressure in the opening direction.
  • the logic valve 12 is controlled by a 4/2 way valve 16
  • the logic valve 14 is a 4/2 way valve 18
  • the logic valve 15 is a 4/2 way valve 19th
  • the logic valve 13 is piloted by a 4/2 way valve 17.
  • the logic valves ⁇ , 13, 14 and 15 and the 4/2-way valves 16, 17, 18 and 19 are constructed the same as the logic valves and pilot valves present in the first embodiment of Figure 2 and operate in the same manner.
  • the logic valves 12 to 15 are shown in their closed position, it being understood that the solenoids of the pilot valves 16 to 19 are energized and the pilot valves occupy their switched position, unlike that shown in FIG. 4, in which the surfaces 22 / 24 (see Figure 3) pressurized and the surfaces A4 / (see Figure 3) are relieved of pressure.
  • the fitting 101 assumes the closed normal position shown in FIG. In emergency mode the
  • the four 4/2-way valves are switched 16 to 19 after switching off the electromagnets by a respective spring in their basic or emergency position shown in Figure 4, whereby the valve body of the logic valves are lifted from their valve seats.
  • the first working line 108a-f and the second working line 110a-f are released.
  • a pressure medium supply from the pressure accumulator 126 held at a certain pressure can flow via the pressure port P and via the first working line 108a-f into the first cylinder chamber 4, while a corresponding amount of pressure medium from the second cylinder chamber 6 via the second working line 110a-f and the tank port T flows to a tank, not shown.
  • the piston and the piston rod of the adjusting cylinder 2 are moved in the sense of an enlargement of the cylinder chamber 4 and a reduction of the cylinder chamber 6 and lift the valve body of the safety valve or regulating valve 101 from its valve seat. Steam can escape from the steam-carrying system, not shown, according to the two arrows.
  • the first working line 108a-f is thus used in emergency mode as a supply line, while the second working line 110a-f serves as a return line.
  • the first cylinder chamber 4 can be supplied in emergency operation via the first working line 108a-f from the pressure accumulator 126, which is charged during normal operation of the safety circuit to a certain pressure.
  • Proportional valve 26 or the switching valve of Figure 1 receives a signal that the
  • FIG. 5 shows a section of a third exemplary embodiment of the safety circuit according to the invention.
  • the safety valve or control valve 1 is shown as in the first embodiment (see FIG. 5
  • Steam pressure is actuated in the direction of closing and is opened in emergency operation with steam assist.
  • first cylinder chamber 204 is a piston rod side cylinder space
  • second cylinder chamber 206 is a bottom-side cylinder chamber
  • the piston of the differential cylinder 202 is operatively connected to a
  • Position sensor 21 which detects each position of the piston.
  • the third embodiment of the safety circuit according to the invention in terms of lines, the control plate with the valves and the pressure accumulator corresponds to the second embodiment shown in FIG 4. Accordingly, the first cylinder bracket 204 via the first working line 108a-f to the pressure port P of the control plate 20 connected while the second
  • Cylinder chamber 206 is connected via the second working line 110a-f to the tank port T of the control plate 120. Of these two working lines, only a part of the first section 108a or 110a is shown in each case.
  • FIG. 6 shows the safety valve or regulating valve 101 with a flow according to the second exemplary embodiment (cf., FIG. 4), with its adjustment the differential cylinder 202 according to the third embodiment (see Figure 5) is used.
  • the fourth embodiment of the safety circuit according to the invention with respect to the lines, the control plate with the valves and the pressure accumulator corresponds to the second embodiment of Figure 4. Accordingly, the first cylinder chamber 204 via the first working line 108a-f to the pressure port P of the control plate 120 connected while the second
  • Cylinder chamber 206 is connected via the second working line 110a-f to the tank port T of the control plate 120. Of these two working lines, only a part of the first section 108a or 110a is shown in each case.
  • the safety valve or regulating valve 1 flows through the steam in such a way that it is actuated against the vapor pressure in the direction of opening and is closed with steam during emergency operation.
  • the first cylinder chamber 204 via the first working line 108a-f pressure medium -. B. from the pressure accumulator 126 -. This opens the safety valve or control valve 101 against the vapor pressure. From the second
  • Cylinder chamber 206 is displaced pressure medium.
  • FIG. 7 shows a circuit diagram of a fifth exemplary embodiment of the safety circuit according to the invention.
  • a valve body of a safety valve or control valve 401 is shown according to a normal operation in its normal position in which it shuts off steam of a system not shown in detail.
  • the valve body can be moved in an emergency operation via the synchronous cylinder 2 by pressurizing a first cylinder chamber 4 - as viewed in Figure 7 - according to the arrow above the synchronous cylinder to the right.
  • a first working line of a control plate 420 which can connect a pressure port P to the first cylinder chamber 4 via two according to the invention in series connected logic valves 12, 14.
  • the thereby displaced from the second cylinder chamber 6 pressure fluid flows through a second working line to a tank port T of Control plate 420, wherein two erfindunlic to each other in series logic valves 15, 13 are arranged in the second working line.
  • the first working line is composed of the line sections 408a, 408b, 408c, 408d, 408e, 408f, 408g, 408h and 408i.
  • the second working line is composed of the line sections 410a, 410b, 410c, 41d0, 41e, 41d and 410g.
  • the first logic valve 12 is arranged between the line sections 408e and 408f, while the second logic valve 14 is arranged between the line sections 408b and 408c.
  • the second logic valve 15th is arranged in the second working line between the line sections 41 Oe and 41 Of the first logic valve 13 is arranged, while between the line sections 410b and 410c, the second logic valve 15th
  • control plate 420 has two further logic valves 512, 513, which are not required in the fifth embodiment according to FIG. All logic valves are active logic.
  • the two first logic valves 12, 13 and the two second logic valves 14, 15 and the two logic valves 512, 513, which are not required in the fifth exemplary embodiment, are piloted in the manner known from the exemplary embodiments 1 and 2.
  • Figure 8 shows a circuit diagram of a sixth embodiment of
  • Safety circuit With regard to the components, ie lines and valves, the arrangement of the fifth embodiment shown in FIG 7 is used. With respect to the function of the valve body of the safety valve or control valve 401 in emergency operation from the normal position shown in Figure 8 is not adjusted as in the embodiment of Figure 7 from left to right, but according to the arrow on the synchronizing cylinder 2 from right to left in this embodiment ,
  • the second cylinder chamber 6 of the synchronizing cylinder 2 is connected to the pressure connection P of the control plate 420 via a second working line, which is modified compared with the fifth embodiment, while the first one
  • first working line to the tank port T is relieved.
  • the line sections 408a, 408b, 408c, 408d, 508e, 508f, 508g serve as the first working line
  • the line sections 410a, 410b, 410c, 41d0, 51e, 510f, 510g serve as the second working line.
  • two logic valves 512, 14 connected in series with one another are arranged in the first working line.
  • the first logic valve 512 is arranged between the line sections 508e and 508f
  • the second logic valve 14 is arranged between the line sections 408b and 408c.
  • the first logic valve 513 is arranged between the line sections 51 Oe and 51 Of, while the second thereto according to the invention connected in series logic valve 15 between the line sections 410b and 410c
  • the two logic valves which are used in the fifth embodiment according to FIG. 7 as the two first logic valves 12, 13, are not used or used in the sixth exemplary embodiment according to FIG.
  • control plate 420 with the total of six pilot operated logic valves 12, 13, 14, 15, 512, 513 for normal operation and emergency operation of the safety valve or
  • Control valve 401 both when it is to be adjusted in emergency operation from the central position according to the fifth embodiment in the one direction, as well as when the valve 401 according to the sixth embodiment in the
  • Pressure port P and the tank port T of the control plate 420 is one of the two valves 12 and 5 2 or 13 and 513 in case of emergency remain closed at least until the valve body of the fitting 401 has released a vapor stream.
  • the two logic 12 and 512 as well as the two logic 13 and 513 differ in terms of their feedforward.
  • the pilot valves of the logic valves 12, 13, 14 and 15 are energized and then the logic valves 12 to 15 closed.
  • the logic valves 12 to 15 are open.
  • the logic valves 12, 13, 14, 15, 512, 513 may be one of two series connected logic valves 12, 13, 14, 15, 512 513, while the other logic valve 12, 13, 14, 15, 512, 513 remains closed.
  • the system remains with the safety valve or regulating valve 1; 101; 401 in normal operation, while the safety of the safety circuit and the system (not shown) is still given.
  • at least the logic valves, at their working ports in normal operation of one of the cylinder chambers or from a pressure port P of the control plate ago no pressure is applied as active logic valves with an independently acted upon by the working ports in the opening direction acting surface.
  • a plurality of control plates 20; 120; 420 for equal or different thresholds on the cylinder 2; 202 be provided and connected.
  • the safety circuits according to the invention can also serve, in normal operation, the safety valve or control valve 1; 101; 401 open and close it in emergency mode.
  • An open position may be located at an intermediate position between the closed position and the 100% open position by means of stroke limitation for the valve piston of the main stage.
  • This intermediate position corresponds to a measured value greater than 0 and less than 100% as voltage or current of an analog
  • working position sensor which can be used to detect without mechanical adjustment and the intermediate positions can.
  • the part of the drive shown in FIG. 1 is first switched ineffective.
  • the proportional valve 26 and in particular the seat valve 36 are de-energized (compare the positions shown in Figure 1). Thereupon is via a not programmable
  • Control of one of two in series with each other arranged logic valves by changing the energization of the electromagnet of the associated 4/2-way valve 16 is opened. Thereafter, this logic valve is closed again and the logic valve connected in series via the associated 4/2-way valve 18 is opened.
  • the alternating switching of two series-connected logic valves is optionally carried out several times in succession. Every time you shift something is consumed control oil.
  • This control oil is removed at least in the embodiments of Figures 2 and 4 a cylinder chamber of the actuating cylinder 2, provided that the pressure therein is higher than the pressure at the pressure port P of the control plate.
  • a respective slight loss of oil in the pressurized cylinder chamber 4 of the adjusting cylinder 2 causes the valve body of the regulating valve 1 to either be relieved, but not opened or to leave its position slightly.
  • the drive path for the proportional valve 26 is transferred again to the programmable logic controller.
  • the part of the hydraulic drive shown in Figure 1 takes over the pressure medium loading of the actuating cylinder 2; 202 via its directly with the cylinder chambers 4; 204 and 6, respectively; 206 connected ports A1 and B1.
  • the control deviations of the proportional valve 26 can be evaluated and compared with the position monitoring of the valve, so that the control function is monitored.
  • two variants of a safety circuit for hydraulically or pneumatically actuated valves via an actuating cylinder are two variants of a safety circuit for hydraulically or pneumatically actuated valves via an actuating cylinder.
  • the actuating cylinder can be relieved hydraulically or pneumatically in an emergency.
  • the actuating cylinder has two cylinder chambers, which can be fluidly connected via a working line.
  • a first and a second series-connected shut-off valve are provided in the working line.
  • the actuating cylinder 2 has a first and a second cylinder chamber 4, 6, which are connectable via a working line 8a-f, characterized in that in the
  • the actuating cylinder can be actuated hydraulically or pneumatically in an emergency.
  • the actuating cylinder has at least a first cylinder chamber, which can be supplied in an emergency via a first pressure medium flow path with pressurized fluid.
  • a first and a second series-connected shut-off valve are provided in the first working line.
  • 101; 401 is hydraulically or pneumatically actuated in an emergency, wherein the actuating cylinder 2; 202, a first cylinder chamber 4; 204, which via a first pressure medium flow path 108; 408; 508 can be supplied with pressure medium, characterized in that in the first pressure medium flow path 108; 408; 508 a first and a second series-connected shut-off valve 12, 14 are provided.
  • Safety circuit according to variant 2 wherein the actuating cylinder 2; 202, a second cylinder chamber 6; 206, which is relieved via a second working line 110a-f, and wherein in the second working line 110, a first and a second series-connected shut-off valve 12, 14 are provided.
  • Safety circuit according to variant 2 wherein the actuating cylinder has a second
  • Cylinder chamber 6, which is supplied via a second pressure medium flow path with pressure medium, and wherein the first and the second cylinder chamber 4, 6 are relieved via the respective pressure medium flow path, and wherein in the second pressure medium flow path, a first and a second series-connected shut-off valve 12, 14 are provided.
  • Safety circuit according to aspect 4 wherein six shut-off valves 12, 14 are provided.
  • Safety circuit according to variant 1 or 2 wherein the shut-off valves are formed by logic valves 12, 14 or 2/2-way poppet valves, each having a valve body, which has an effective closing in the closing direction closing surface 22, 24 and an effective in the opening direction annular surface has, wherein the closing surface 22, 24 and the annular surface are each relieved or acted upon by pressure medium.
  • Safety circuit according to aspect 7, wherein the shut-off valves 12, 14 and / or the 4/2-way valves 16, 18 are electronically monitored.
  • Safety circuit according to variant 1, wherein the main valve is a shut-off valve or a safety valve 1; 101; 401 of a pressurized systei is.

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  • 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 Turbines (AREA)

Abstract

L'invention porte sur deux variantes d'un circuit de sécurité pour soupapes actionnées hydrauliquement par l'intermédiaire d'un cylindre de réglage. Selon la première variante, le cylindre de réglage (2, 202) est déchargé hydrauliquement ou pneumatiquement en cas de détresse. Pour cela, le cylindre de réglage possède deux chambres de cylindre (4, 204) qui peuvent être reliées fluidiquement par une conduite de travail (8a - f, 108a - f, 408a - i). Dans la conduite de travail, sont montées en série des première et deuxième vannes d'arrêt (12, 14). Selon la deuxième variante, le cylindre de réglage peut être actionné hydrauliquement ou pneumatiquement en cas de détresse. Pour cela, le cylindre de réglage comporte au moins une première chambre de cylindre qui, en cas de détresse, peut être alimentée en fluide sous pression par l'intermédiaire d'un premier trajet d'écoulement de fluide sous pression. Dans le premier trajet d'écoulement de fluide sous pression, sont agencées des première et deuxième vannes d'arrêt montées en série.
EP11782040.7A 2010-11-08 2011-10-20 Entraînement hydraulique ou pneumatique pour l'actionnement d'un appareil de robinetterie comportant une soupape de réglage ou de commande Active EP2638297B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010060432 2010-11-08
DE102011103222 2011-06-01
PCT/EP2011/005278 WO2012062404A1 (fr) 2010-11-08 2011-10-20 Entraînement hydraulique ou pneumatique pour l'actionnement d'un appareil de robinetterie comportant une soupape de réglage ou de commande

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EP2638297A1 true EP2638297A1 (fr) 2013-09-18
EP2638297B1 EP2638297B1 (fr) 2015-12-30

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US (1) US9528534B2 (fr)
EP (1) EP2638297B1 (fr)
JP (1) JP5710015B2 (fr)
KR (1) KR101901121B1 (fr)
CN (1) CN103370546B (fr)
DE (1) DE102011116472A1 (fr)
WO (1) WO2012062404A1 (fr)

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US10480346B2 (en) 2014-06-03 2019-11-19 Voith Patent Gmbh Hydraulic control device for an emergency stop valve of a steam turbine and steam turbine arrangement
CN104179881B (zh) * 2014-07-18 2017-09-01 武汉船用机械有限责任公司 一种自升式平台缓冲系统
CN104154056B (zh) * 2014-07-30 2016-05-04 宁波恒力液压股份有限公司 一种具有互锁功能的大流量液压换向回路
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WO2012062404A1 (fr) 2012-05-18
JP2013543957A (ja) 2013-12-09
US20140026747A1 (en) 2014-01-30
JP5710015B2 (ja) 2015-04-30
DE102011116472A1 (de) 2012-05-10
US9528534B2 (en) 2016-12-27
KR101901121B1 (ko) 2018-09-27
CN103370546A (zh) 2013-10-23
EP2638297B1 (fr) 2015-12-30
CN103370546B (zh) 2018-06-26
KR20140021987A (ko) 2014-02-21

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