EP1220993A2 - Soupape de securite - Google Patents

Soupape de securite

Info

Publication number
EP1220993A2
EP1220993A2 EP00974333A EP00974333A EP1220993A2 EP 1220993 A2 EP1220993 A2 EP 1220993A2 EP 00974333 A EP00974333 A EP 00974333A EP 00974333 A EP00974333 A EP 00974333A EP 1220993 A2 EP1220993 A2 EP 1220993A2
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
piston
safety valve
cylinder unit
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
EP00974333A
Other languages
German (de)
English (en)
Other versions
EP1220993B1 (fr
Inventor
Stefan Pfund
Günter Baldauf
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.)
Norgren GmbH
Original Assignee
IMI Norgren Herion Fluidtronic GmbH and Co KG
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 IMI Norgren Herion Fluidtronic GmbH and Co KG filed Critical IMI Norgren Herion Fluidtronic GmbH and Co KG
Publication of EP1220993A2 publication Critical patent/EP1220993A2/fr
Application granted granted Critical
Publication of EP1220993B1 publication Critical patent/EP1220993B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/001—Double valve requiring the use of both hands simultaneously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87193—Pilot-actuated
    • Y10T137/87209—Electric

Definitions

  • the invention relates to a safety valve for compressed air-operated consumers according to the preamble of claim 1.
  • Such a safety valve can be found, for example, in DE 30 05 547 C2 and DE 196 22 198 AI.
  • Such safety valves are used, for example, to actuate clutches and brakes on presses.
  • the inlet is blocked in such safety valves and the line leading to the consumer is vented. tet, so that there is no residual pressure in the latter.
  • the safety valve resulting from DE 30 05 547 C2 it is provided in the safety valve resulting from DE 30 05 547 C2 that the control air for the pilot valves should not be taken directly from the inlet, but from cross ducts, which contain the two holes in which the valve disks are guided , connect with each other crosswise. This enables constant dynamic self-monitoring of the safety valve.
  • the object of the invention is to develop a safety valve of the generic type in such a way that the valve can be reset or switched on again in a simple manner, preferably without the aid of electrical switching elements, after the fault has been eliminated.
  • each switching element has a device for dynamic monitoring of pressure differences in at least two Pressure lines with a piston-cylinder unit, which connects the inlet of one of the two directional control valves with the atmosphere at different pressures in the two pressure lines.
  • the switching element is preferably arranged in one of the pilot channels.
  • Figure 1 is a sectional view of a safety valve according to the invention in the rest position.
  • Figure 2 shows the safety valve in the switch position.
  • FIG. 6 shows a monitoring device used in a safety valve according to the invention of pressure differences in two pressure lines in the rest position
  • Fig. 7 shows the device shown in Fig. 6 in the storage position.
  • a safety valve 10, shown in FIGS. 1 to 5, comprises a housing 12 in which two directional valves are arranged in parallel. Each of the two directional control valves has a working piston 16a and 16b and a valve disk 18a, 18b firmly connected to it.
  • the housing 12 has an inlet connection 20 for compressed air, a return connection 22 and a consumer connection 24.
  • Each of the directional control valves is assigned an electromagnetically switchable pilot valve 26a or 26b with valve seats 28a or 28b and ventilation openings 30a or 30b.
  • the piston-shaped valve plates 18a, 18b are guided in bores 36a, 36b of the housing 12. This opens and closes valve seats 34a, 34b. Valve seats 32a, 32b are opened and closed by working pistons 16a, 16b.
  • the two valve disks 18a, 18b have transverse bores 38 which open into an annular channel 42a or 42b.
  • two channels 46a, 46b are formed in the housing 12, through which the two bores 36a, 36b can be mutually connected.
  • Pilot channels 48a, 48b branch off from these cross channels 46a, 46b Storage chambers 60a, 60b and devices for dynamic monitoring of pressure differences, to be described in more detail below, hereinafter called storage valves 70a, 70b for short, lead to the valve seats 28a, 28b of the pilot valves 26a, 26b.
  • Channels 50a and 50b also lead from the pilot valves to the working pistons 16a, 16b and to their working chambers 14a, 14b.
  • the storage valves 70a, 70b are connected in such a way that the storage valve 70a assigned to one directional control valve 26a or one of the two directional control valves connected in parallel has a first input line 71a, which is connected on the one hand to an electromagnetically actuated valve 72a and on the other hand to the input line 73b of the other storage valve 70b and a second input line 73a connected to the storage chamber 60b.
  • the storage valve 70b assigned to the other directional control valve has an input line 71b, which is connected on the one hand to an electromagnetically actuated valve 72b and on the other hand to the second input line 73a of the other storage valve 70a, whereas its second input line 73b is connected to the first input line 71a of the storage valve 70a ,
  • the storage valves 70a, 70b are thus also connected crosswise via the storage chambers 60a, 60b via the channels 48a and 48b to the directional valves arranged in parallel. To understand the functioning of the safety valve, the functioning of the storage valves 70a, 70b is first explained with reference to FIGS. 6 and 7.
  • the storage valve for dynamic monitoring and storage of pressure differences shown in FIGS. 6 and 7, comprises a housing 200 having a connection 207 which is connected to the second input lines 73a and 73b and a connection 211 which is connected to the first input lines 71a and 71b is connected.
  • a piston 202 is displaceable in the housing 200 in an opening of the housing 200 against the restoring force of restoring springs 205.
  • the accumulator valve further includes a port 208 and a port 210, the port 208 depending on the position of the piston 202 with either the port
  • connection 210 which in turn is connected to the atmosphere.
  • connection 210 is connected to the return line 22 or the atmosphere.
  • the piston 202 is closed on its side facing away from the return springs 205 by a membrane 201 which is fastened in the housing 200 and forms an effective pressure surface AI with which the piston 201 can be acted upon by a pressure prevailing at the connection 211.
  • the effective pressure surface is formed by the larger pressure surface A2 of the piston 202 formed on this side by a seat 209.
  • the pressure surface can also be formed by a piston with a sealing element, which can be a lip ring, for example.
  • the spring force generated by the return springs 205 holds the piston 202 in its rest position shown in FIG. 6.
  • the piston 202 has sealing surfaces 203 on its side facing away from the return springs 205, which cooperate with the valve seat 209.
  • the piston 202 On its side facing the return springs 205, the piston 202 also has a sealing surface 204 which interacts with a valve seat 206.
  • the storage valve stores a signal whenever there is a pressure at port 211 and no pressure at port 207, or when there is a pressure difference here, as will be described in more detail below.
  • connection 210 is connected to the atmosphere or return line 22.
  • the memory function of the memory valve is as follows. If the fluid pressure at port 207 and thus at port 208 drops - a pressure difference can be determined by the interaction of the area AI, A2 and the spring force of the springs 205, at which a storage process is to be initiated - the spring force remains (only) and the resulting force from the lower pressure opposite port 211 at ports 207, 208 to hold piston 202 in its rest position. However, since the pressure force applied to the diaphragm 201 outweighs the spring force and the resulting force from the lower pressure compared to the connection 211 at the connections 207, 208, since the connection 211 is still pressurized, the piston 202 moves into the in 7 storage position shown downward in the direction of the valve seat 206 with the surface A3.
  • connection 207 and 208 If a fluid pressure is again present at the connection 207 and 208 or the pressure rises again, only a small upward force arises, which is formed from the product "seat A3 of the valve seat 206 times fluid pressure".
  • the seat surface A3 of the valve seat 206 is dimensioned so that this force together with the force generated by the return springs 205 is not sufficient to move the piston 202 against the downward force which is formed by the product "fluid pressure times membrane surface AI" ,
  • a pressure equalization between connection 207 and 211 does not lead to a reset or deletion of the memory function of the device in the rest position. The pressure difference that has occurred remains, to a certain extent, stored by the position of the piston which connects port 208 through port 210 to the atmosphere.
  • Resetting the storage valve i.e. an extinguishing function can only be achieved in that the space above the diaphragm 201 is vented through the connection 211, so that the springs 205 and the fluid pressure applied to the seat surface A3 move the piston 202 upwards again into its initial or rest position. In this case the stored signal is deleted.
  • the venting as described below in connection with FIGS. 1 to 5, can take place via the electromagnetically actuated reset valves 72a or 72b.
  • Fig. 1 the safety valve is shown in the rest position. In the rest position, the pilot valves 26a, 26b are closed and the working chambers 14a, 14b of the working pistons 16a, 16b are vented via the channels 50a, 50b and the ventilation openings 30a, 30b of the pilot valves 26a, 26b.
  • the valve plates 18a, 18b are thus pressed by the compression springs 80a and 80b (and the pressure medium) against the seats 34a, 34b and close them.
  • the valve seats 32a and 32b of the working pistons are open, so that the consumer connection 24 to the return connection 22 is vented.
  • pilot valves 26a, 26b are now switched over, as shown in FIG. 2, their valve seats 28a, 28b are opened and their ventilation opening 30a, 30b is closed.
  • the volume of the pilot channels 48a, 48b of the storage chambers 60a, 60b and of the second connecting lines 73a, 73b and the connecting lines 75a, 75b of the storage valves 70a, 70b is selected to be so large that those in the pilot channels 48a, 48b and the storage chambers 60a, 60b and the second connecting lines 73a, 73b and the connecting lines 75a, 75b, compressed air which flows via the valve seats 28a, 28b and the channels 50a, 50b into the working chambers 14a and 14b of the working pistons 16a, 16b, is sufficient for the working pistons 16a, 16b to switch over so that they assume the position shown in FIG.
  • valve seats 32a, 32b of the working pistons are closed and the valve seats 34a, 34b of the valve disks 18a, 18b are open.
  • the compressed air flows from the inlet 20 into the hollow bored valve plates 18a, 18b, from there through the cross bores 38 into the ring channels 42a, 42b, then through the cross channels 46a, 46b into the ring channels 40a, 40b and from there through the Valve seats 34a, 34b through the consumer port 24 to the consumer.
  • the compressed air flows from the cross channels 46a, 46b or from the ring channels 40a, 40b into the pilot channels 48a, 48b, into the storage chambers 60a, 60b and towards the storage valves 70a, 70b, both the input line 71a and 71b respectively the inlet line 73a and 73b of the storage valves 70a and 70b are also pressurized with compressed air under the same pressure.
  • the storage valves 70a, 70b are in the rest position described above, so that the valve seats 28a and 28b are filled with compressed air, which are under the full inlet pressure, around the working pistons 16a, 16b of the valves arranged in parallel via the lines 50a, Hold 50b in switch position.
  • the two directional control valves are then switched back to the rest position shown in FIG. 1, since the working pistons 16a, 16b are no longer acted upon by the compressed air and therefore the springs 80a, 80b control the valves. Press tilt plates 18a, 18b onto their valve seats 34a, 34b.
  • the pilot channels 48a and 48b are filled with compressed air which has the full inlet pressure, so that when this compressed air is switched again, the working pistons 16a, 16b are switched back to the position shown in FIG. 2.
  • valve plate 18a Compressed air enters through the valve plate 18a via the transverse bore 38 and the ring channel 42a into the cross channel 46b, but since the valve plate 18b is in the closed position, it cannot continue there. stream. However, the working piston 16a remains supplied with the full inflow via the pilot channel 48b connected to the cross channel 46b.
  • the pilot channel 48a is vented to the return 22 via the ring channel 40a and the open valve seats 34a and 32b, so that no pressure can build up in the pilot channel 48a and any pressure on the return pressure, e.g. Atmospheric pressure is reduced.
  • the storage valve 70a Due to the switching of the storage valves 70a, 70b, the storage valve 70a is in its rest position in this case, in which the line 73a is connected via the line 75a to the valve seat 28a of the solenoid valve 26a, so that the valve seat 28a via the pilot line 48b and the storage chamber 60b is pressurized with fluid under pressure.
  • the storage valve 70b has changed over to its storage position, since the same pressure is not present in the two lines 71b and 73b.
  • the device can also be reset by switching off the system pressure.
  • This can e.g. the solenoid valve or the mechanically operated valve, which is actuated, for example, by means of a key switch, is eliminated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Multiple-Way Valves (AREA)
  • Fluid-Driven Valves (AREA)
  • Safety Valves (AREA)

Abstract

L'invention concerne une soupape de sécurité pour des récepteurs actionnés par air comprimé, comportant deux distributeurs présentant chacun un piston moteur et une cuvette de soupape reliée à celui-ci. Chaque distributeur peut être commuté par une soupape lui étant affectée. Les deux cuvettes de soupape sont respectivement logées dans un perçage du carter de soupape, et ces deux perçages sont reliés en croix par deux canaux en croix. Par l'intermédiaire d'un canal de commande pilote, le siège de soupape de la première soupape pilote est relié au canal en croix s'étendant à partir du perçage d'une des cuvettes de soupape, et par l'intermédiaire d'un autre canal de commande pilote, le siège de soupape de la deuxième soupape pilote est relié à l'autre canal en croix s'étendant à partir du perçage de l'autre cuvette de soupape. Ledit dispositif est caractérisé en ce qu'un élément de commutation actionné par air comprimé est prévu sur deux points mutuellement affectés des deux distributeurs, la soupape de sécurité pouvant être verrouillée au moyen de cet élément de commande en cas de pressions différentes sur ces deux points, et pouvant uniquement être réactivée par actionnement par air comprimé externe d'au moins un des deux éléments de commande.
EP00974333A 1999-10-15 2000-09-28 Soupape de securite Expired - Lifetime EP1220993B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19949874A DE19949874B4 (de) 1999-10-15 1999-10-15 Sicherheitsventil
DE19949874 1999-10-15
PCT/DE2000/003376 WO2001029429A2 (fr) 1999-10-15 2000-09-28 Soupape de securite

Publications (2)

Publication Number Publication Date
EP1220993A2 true EP1220993A2 (fr) 2002-07-10
EP1220993B1 EP1220993B1 (fr) 2004-08-04

Family

ID=7925843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00974333A Expired - Lifetime EP1220993B1 (fr) 1999-10-15 2000-09-28 Soupape de securite

Country Status (6)

Country Link
US (1) US6758241B1 (fr)
EP (1) EP1220993B1 (fr)
JP (1) JP4643100B2 (fr)
DE (2) DE19949874B4 (fr)
ES (1) ES2223604T3 (fr)
WO (1) WO2001029429A2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60217753T2 (de) * 2001-05-04 2007-11-15 Ross Operating Valve Co., Troy Steuerventilsystem
US20030084219A1 (en) * 2001-10-26 2003-05-01 Maxxan Systems, Inc. System, apparatus and method for address forwarding for a computer network
US7145914B2 (en) 2001-12-31 2006-12-05 Maxxan Systems, Incorporated System and method for controlling data paths of a network processor subsystem
US7406038B1 (en) 2002-04-05 2008-07-29 Ciphermax, Incorporated System and method for expansion of computer network switching system without disruption thereof
US7379970B1 (en) 2002-04-05 2008-05-27 Ciphermax, Inc. Method and system for reduced distributed event handling in a network environment
US7295561B1 (en) 2002-04-05 2007-11-13 Ciphermax, Inc. Fibre channel implementation using network processors
US7307995B1 (en) 2002-04-05 2007-12-11 Ciphermax, Inc. System and method for linking a plurality of network switches
US20030195956A1 (en) * 2002-04-15 2003-10-16 Maxxan Systems, Inc. System and method for allocating unique zone membership
US20030200330A1 (en) * 2002-04-22 2003-10-23 Maxxan Systems, Inc. System and method for load-sharing computer network switch
US20040030766A1 (en) * 2002-08-12 2004-02-12 Michael Witkowski Method and apparatus for switch fabric configuration
DE102009037120B4 (de) 2009-08-11 2012-12-06 Festo Ag & Co. Kg Pneumatische Sicherheitsventileinrichtung
DE102013013312A1 (de) * 2013-08-12 2015-02-12 Heye International Gmbh Ventilbaugruppe für eine I.S.-Maschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2121528C3 (de) 1971-05-03 1983-05-05 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Pneumatische Zweihand-Einrücksteuerung für einen Druckluftverbraucher
DE3005547C2 (de) 1980-02-14 1985-05-02 Technomatic AG, Aesch, Luzern Sicherheitsventil
FR2643174B1 (fr) 1989-02-13 1994-06-17 Quiet Sa Dispositif de securite a rearmement pour la commande du declenchement d'au moins une mesure de securite sur une installation comportant au moins une alimentation pneumatique, en cas de chute de pression de cette alimentation
DE9014789U1 (fr) * 1990-10-25 1991-02-07 Herion-Werke Kg, 7012 Fellbach, De
US5113907A (en) * 1991-01-29 1992-05-19 Ross Operating Valve Company Dynamic self-monitoring air operating system
DE19622198A1 (de) * 1996-06-03 1997-12-04 Herion Technomatic Ag Aesch Vorrichtung zur dynamischen Überwachung von Ventilen
US5927324A (en) 1996-12-16 1999-07-27 Ross Operating Valve Company Cross flow with crossmirror and lock out capability valve
US5850852A (en) * 1996-12-16 1998-12-22 Ross Operating Valve Company Crossflow with crossmirror and lock out capability valve

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0129429A2 *

Also Published As

Publication number Publication date
DE19949874B4 (de) 2004-09-23
DE19949874A1 (de) 2001-04-26
US6758241B1 (en) 2004-07-06
ES2223604T3 (es) 2005-03-01
JP4643100B2 (ja) 2011-03-02
EP1220993B1 (fr) 2004-08-04
WO2001029429A2 (fr) 2001-04-26
WO2001029429A3 (fr) 2001-06-14
DE50007312D1 (de) 2004-09-09
JP2003512579A (ja) 2003-04-02

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