EP0089881B1 - Compressed air economising device - Google Patents

Compressed air economising device Download PDF

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Publication number
EP0089881B1
EP0089881B1 EP83400524A EP83400524A EP0089881B1 EP 0089881 B1 EP0089881 B1 EP 0089881B1 EP 83400524 A EP83400524 A EP 83400524A EP 83400524 A EP83400524 A EP 83400524A EP 0089881 B1 EP0089881 B1 EP 0089881B1
Authority
EP
European Patent Office
Prior art keywords
fluid
valve
piston
pressure
action
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.)
Expired
Application number
EP83400524A
Other languages
German (de)
French (fr)
Other versions
EP0089881A3 (en
EP0089881A2 (en
Inventor
Yves Levenez
André Legris
Daniel Bouteille
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.)
Legris SA
Original Assignee
Legris SA
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
Priority claimed from FR8205042A external-priority patent/FR2523659A1/en
Priority claimed from FR8303513A external-priority patent/FR2542043B2/en
Application filed by Legris SA filed Critical Legris SA
Publication of EP0089881A2 publication Critical patent/EP0089881A2/en
Publication of EP0089881A3 publication Critical patent/EP0089881A3/en
Application granted granted Critical
Publication of EP0089881B1 publication Critical patent/EP0089881B1/en
Expired legal-status Critical Current

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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/064—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with devices for saving the compressible medium
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow 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
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F15B2211/50527—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves using cross-pressure relief 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member

Definitions

  • the present invention relates to a compressed air saver device.
  • a compressed air saving device corresponding to the preamble of claim 1 (GB-A No. 2074701).
  • the cylinders are oversized in relation to the load they have to move, in order to satisfy the criteria of speed of movement and mechanical resistance and, as a result, this results in consumption of compressed air. larger than would be necessary to move said load.
  • the air consumption will be the same whether or not the cylinder is equipped with a flow limiter reducing the speed of the piston.
  • a device according to the invention is used.
  • the device comprises a means ensuring the passage of the working fluid under pressure during the greater part of the stroke of the movable member of the jack and closing said passage of fluid under pressure before or at the end of the stroke of said member mobile.
  • the economizer device according to the invention is preferably arranged between the orifice of the jack and the outlet of the dispenser, as close as possible to the latter.
  • the invention comprises a non-return device capable of allowing the exhaust air of the jack to pass at full flow when the movable member returns.
  • the valve is closed under the pressure of the working fluid.
  • a cylinder 1 is shown which is connected to a pneumatic distributor 2 by means of a compressed air saving device 3 according to the invention, said double-acting cylinder 1 comprising a cylinder in which moves a piston 4 connected by a rod 5 to a load to be moved. Furthermore, the distributor 2 is capable of putting said cylinder in communication with a network 6 for distributing compressed air and with a purge orifice 7 opening to the atmosphere.
  • the air-saving device 3 comprises a body 8 in which are mounted two economizer assemblies which are connected respectively by conduits 9, 9a to the chambers 10, 10a of the jack 1, each assembly comprising a valve 11, 11 mounted slidingly with interposition of 'A seal 12, 12a in a bore 13, 13a formed in the body 8, said valve having at one of its ends forming a sealing member a seal 14, 14a which is capable of closing an orifice 15, 15a of a seat 16, 16a mounted to slide in a housing 17, 17a in communication via a conduit 18, 18a with the distributor 2.
  • the valves 11, 11 a comprise a piston 19, 19a provided with a seal 20, 20a and moving in a cylinder 21, 21 formed in the body 8, said piston being subjected on its upper face to the action of a spring 22, 22a, one end of which bears against the end of a screw 23, 23a engaged in a tapped hole 24, 24a provided in the body 8 at the upper part of the cylinders 21.21 a.
  • the spring 22, 22a tends to push the valve 11, 11a against the seat 16, 16a.
  • the space 29, 29a formed between the bottom of the cylinder 21, 21a and the face of the piston 19.19a opposite the bearing face of the spring is in communication by a conduit 26, 26a with a conduit 27, 27a connecting the cylinder housing 17, 17a above the seat 16, 16a.
  • the driving chamber 10 is supplied with working fluid P1 under pressure by the conduits 9 and 27, the orifice 15 of the seat 16 (the valve 11 being in the open position), the conduit 18 and the distributor 2 which is connected to the distributor network 6 of compressed air at pressure P.
  • the chamber 10a of the jack 1 being in the air purge position, there occurs in said chamber a back pressure P2, so that the air flows through the conduits 9a, 27a, the orifice 15a (the valve 11a being in the open position), the conduit 18a and the distributor 2 which is connected to the atmosphere at 7.
  • the conduit 27 being connected by the conduit 26a to the chamber 29a located under the piston 19a, the driving pressure P1 exerts on said piston a force against the spring 22a, which is compressed, thus ensuring the opening of the valve 11 a allowing the passage of the exhaust fluid at the back pressure P2 towards the distributor 2 and towards the atmosphere at 7.
  • the hardness of the springs 22, 22a is adjusted by compressing them by means of the screws 23, 23a, starting from a certain compression of the springs 22, 22a the device operates as a regulator.
  • the piston 19,19a is extended by a part 30, 30a of smaller section than the piston 19, 19a and moving in a cylindrical housing 31, 31 a.
  • valve 11, 11 a has an axial channel 32, 32a opening at its upper part into the space 31, 31 a and at its lower part in the conduit 27.
  • This arrangement makes it possible to bring the working fluid P1 into the space 31 (fig. 4) where its pressure on the part 30 of the piston 19 is exerted against the pressurized fluid located in the chamber 29 under the piston 19; however, the section of the part 30 being smaller than that of the piston 19 subjected to the pressure of the exhaust fluid P2, the valve 11 is held in the open position against the screw 23 which makes it possible to reduce the flow rate as desired and, therefore, the speed of the cylinder; the air consumption being lower the lower the speed.
  • FIG. 6 and 7 another embodiment of the economizer device has been shown in which the piston 19 is controlled by a pneumatic signal corresponding to a position of the piston 4 of the jack 1 before or at the end of the stroke.
  • a chamber 33, 33a situated above the piston 19, 19a is connected by a conduit 34, 34a to a cell 35, 35a or limit switch supplied from a conduit 36, 36a and d a distributor 37, 37a selectively connecting the cell to a source of pressurized fluid and to the atmosphere.
  • the cells 35, 35a have a feeler 38, 38a capable of coming into contact with a part 39 of the rod 5 of the piston 4, so that when the cell 35, 35a is actuated it sends a pneumatic signal to the chamber 33, 33a which pushes the piston 19,19a down and ensures the closing of the valve 11, 11 a.
  • the chamber 33a also being unpressurized and the valve being in the open position, the fluid at the pressure P2 escapes from the chamber 1a of the jack via the conduit 27a and the distributor 2.
  • the screws 23, 23a make it possible to adjust the fluid flow rate and, consequently, the speed of the piston 4 of the jack.
  • the cell 35, 35a, or end of stroke sensor can be replaced by a sensor for the passage of the movable member or piston 4 of the jack.
  • a pneumatic signal is used coming from a circuit associated with the movement of another jack triggering immediately after the end of the stroke of the piston of the control jack.
  • a compressed air saving device which comprises a body 41 mounted between a distributor 42 and a base 43 with which it is in contact by two of its faces 44 and 45, said base 43 having integrated channels including a channel 46 connected to the compressed air distributor, channels 47, 47a connected to the atmosphere and channels 48, 48a connected to the chambers 10, 10a of the jack 1.
  • Channels 46, 47, 47a, 48, 48a of fluid open onto one of the faces 45 of the body 41 which has on its other face 44 orifices opening into the conduits of the distributor 42.
  • a sleeve 49,49a having a cylinder closed by a screw cap 50, 50a and in which is slidably mounted a piston 51,51 of a valve 11,11 a having a shutter member or joint 52, 52a capable of closing a hole 53, 53a.
  • the piston 51 is subjected on one of its faces to the action of a spring 54, 54a which keeps the valves 11, 11 a in the open position, in the absence of pressurized fluid.
  • the body 41 includes a duct 55, 55a in which is mounted a non-return valve 56, 56a subjected to the action of a spring 57, 57a which only ensures the passage of the chambers 10, 10a towards the exhaust 47, 47a.
  • Said conduit 55, 55a is in communication on one side of the valve 56, 56a through the orifice 53.53a with a chamber 58.58a and on the other side of the valve by an orifice 59, 59a.
  • the valve 11, 11a has an axial duct 61, 61a putting the chamber 58,58a in communication with the chamber 62,62a and a duct 63,63a connects the duct 55, 55a to a chamber 64, 64a placed under the piston 51, 51 a.
  • the piston 51, 51 a is not connected to the chamber 58, 58a and the plug 50, 50a has a conduit 66, 66a which is connected in particular to a position sensor of the piston 4 before or at the end of the stroke which delivers in the chamber 62, 62a a pneumatic signal or a certain quantity of fluid which pushes the piston 51 and the valve 11, 11 a in the closed position.
  • FIG. 10 there is shown an alternative embodiment of the dual compressed air economizer device whose body 41 is mounted in the same manner as in FIG. 8 between the distributor 2 and the base 43.
  • a valve 67, 67a subjected to the action of a spring 79, 79a is held in the open position relative to the orifice 68, 68a which connects the conduits 69, 69a leading to the chambers 10 and 1 Oa of the jack and the conduits 70, 70a selectively connected by the distributor 42 to the compressed air network and to the atmosphere.
  • the valve 67, 67a comprises a rod 71, 71 a which is mounted to slide freely in a blind hole in the piston 72, 72a which moves in a cylinder provided in a jacket 73, 73a mounted in leaktight manner in the body 41, said piston 72, 72a being subjected on its face of larger section to the action of a spring 74, 74a bearing against a sleeve 75, 75a screwed into the jacket 73, 73a, said sleeve being capable of being actuated by a plug 76, 76a in order to adjust the pressure of the spring 74, 74a.
  • chambers 77, 77a are connected to the conduits 70, 70a by conduits 78, 78a.
  • valve 67a When the chamber 10a is supplied with working fluid through the conduits 70a and 69a, the valve 67a is in the open position pushed back by the piston 72 on which the spring 74a and the exhaust pressure act in the chamber 77a against the action of the working fluid acting on the smallest section of the piston on the opposite face.
  • the spring 74a is compressed under the action of the pressure of the working fluid and the piston 72a moves against the sleeve 75a thus allowing the valve 67a under the action of the pressure of the working fluid to close off the orifice 68a and to interrupt the passage of the working fluid between the conduits 70a and 69a towards the driving chamber 10a.
  • the exhaust fluid coming from the chamber 10 passes through the conduits 69 and 70, the valve 67 being in the open position, and goes via the distributor 42 towards the exhaust channel 47.
  • FIG. 11 there is shown an economizer device the body 41 of which is mounted between a distributor 42 and a base 43 as shown in FIG. 8.
  • the device is identical to that of FIG. 10, however, the plugs 76, 76a include conduits 80, 80a which are connected to position sensors of the piston 4 before or at the end of the stroke which deliver a pneumatic signal.
  • the piston 72, 72a is extended by a rod 81, 81 a extending through the sleeve 75, 75a and in the plug 76, 76a, said rod 81, 81 a having a conduit 82, 82a in communication on one side with the conduit 80, 80a and on the other with the chamber 83, 83a arranged under the piston 72.
  • a pneumatic signal is emitted at one of the ends and transmitted by the conduits 80, 80a and 82, 82a, the piston 72, 72a is raised against the spring 74, 74a, so that the valve 67, 67a closes under the action of the pressure of the working fluid coming from the conduit 70, 70a.
  • an economizer device which comprises a double connection body consisting of two elements 84, 84a in the form of a T connected together by a rib 85 and arranged with their parallel axes.
  • Each element 84, 84a of the body fig.
  • conduits 86, 86a for circulation of the fluid which are provided with connection means 87, 87a with external pipes, said element of the body having in its central part a bore 88 perpendicular to the conduits 86, 86a and in which is mounted a valve 89 which comprises a shutter member 90 integral with a piston 91 slidably mounted in a cylinder provided on one side of the bore 88 and closed by a plug 92 against which one of the ends of a spring 93 bears, the other end of which acts in combination with the exhaust pressure against the piston 91.
  • the other end of the bore is closed by a plug 94 carrying a deformable membrane 95 forming a non-return valve and a screw 96 engaged in a tapped hole in the plug 94, said screw 96 limiting the stroke of the valve 89 and making it possible to adjust the speed of the piston of the jack.
  • the operation of this device is identical to that of the device shown in FIG. 10 and which has been described above.
  • economizer device which comprises a double connector body 101 in the form of a compact block and which contains two economizer assemblies identical to that shown in FIG. 12 and which has been described above.
  • fig. 17 shows an adjustment sleeve 97 which can be mounted to replace the plug 92 for adjusting the spring 93 and the fluid outlet pressure.
  • an economizer device which comprises a double connection body consisting of two elements 84, 84a in the form of a T, connected together by a rib 85 and arranged with their parallel axes.
  • Each element 84, 84a of the body (fig. 18) has at its two ends conduits 86, 86a for circulation of the fluid which are provided with connection means 87, 87a with external pipes, said element having in its central part a bore 102 perpendicular to the conduits 86,86a.
  • a plug 103 against which a spring 104 pushes against a valve 105 controlling the passage of the working and exhaust fluid, said valve 105 being extended by a rod 106 slidably mounted in a blind hole of a piston 107 sliding in the bore 102, said piston being subjected on one of its faces to the action of a spring 108 bearing against an adjustment plug 109 screwed into the central bore and the action of the exhaust fluid.
  • an economizer device which comprises a simple connector 110 enclosing a valve 111 for controlling the passage of the fluid and having an orifice 112 connected by a conduit 113 to a chamber 10 of a jack 1 and a conduit 114 connected to a distributor 115 capable of bringing said chamber 10 into communication with a source of pressurized fluid and the atmosphere.
  • the other chamber 10a of the jack is connected by a conduit 116 directly to the distributor 115, but it would obviously be possible to mount on the conduit 116 a simple connector identical to the connector 110 which includes an economizer device.
  • the connector 110 comprises a main body 117 having at its base a threaded portion 130 for mounting in a tapped hole of a support or connection member, or of the distributor 115, said body 117 containing a valve 111 for controlling passage of fluid controlled by a piston 118 subjected to the action of a pneumatic signal or of a certain quantity of fluid directed into a chamber 119 formed between the upper part of the piston and a plug 120 screwed into a tapped part of the body 117, said plug being pierced with a conduit 121 connected by a conduit 122 to a sensor 123 of the position of the piston 4 of the jack.
  • a movable seat 124 which is pushed against a shoulder of the body and against the valve shutter member by a spring 125.
  • the main body 117 receives a socket 126 comprising a tube 127 putting the conduit 113 in communication with the conduit 114 through the space between the valve 111 and the main body through the orifice 128 and through the conduit 112 of the tube 127.
  • a socket 126 comprising a tube 127 putting the conduit 113 in communication with the conduit 114 through the space between the valve 111 and the main body through the orifice 128 and through the conduit 112 of the tube 127.
  • the piston 4 As soon as the piston 4 reaches the end of the race or before the end of the race, it acts on the sensor 123 which sends a pneumatic signal in the chamber 19 pushing the piston 18 downwards and the valve 111 against the seat 124 thus closing the passage towards chamber 10, the supply of working fluid of which is interrupted.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Driven Valves (AREA)

Description

La présente invention a pour objet un dispositif économiseur d'air comprimé. On connaît déjà un dispositif économiseur d'air comprimé correspondant au préambule de la revendication 1 (GB-A N° 2074701 ).The present invention relates to a compressed air saver device. There is already known a compressed air saving device corresponding to the preamble of claim 1 (GB-A No. 2074701).

En règle générale, les vérins sont surdimension- nés par rapport à la charge qu'ils ont à déplacer, afin de satisfaire aux critères de vitesse de déplacement et de résistance mécanique et, de ce fait, il en résulte une consommation d'air comprimé plus importante qu'il ne serait nécessaire pour déplacer ladite charge.As a general rule, the cylinders are oversized in relation to the load they have to move, in order to satisfy the criteria of speed of movement and mechanical resistance and, as a result, this results in consumption of compressed air. larger than would be necessary to move said load.

Au départ du piston d'un vérin, toute la pression de fluide du réseau de distribution s'exerce sur le piston provoquant un démarrage rapide, puis la détente du fluide provoque la chute de la pression dans la chambre motrice du vérin, de manière d'autant plus importante que la charge à déplacer est faible. Cependant, lorsque le piston arrive en fin de course, la pression du fluide moteur s'élève à nouveau inutilement pour atteindre la valeur de la pression du réseau distributeur de fluide.At the start of the piston of a cylinder, all the fluid pressure of the distribution network is exerted on the piston causing a rapid start, then the expansion of the fluid causes the pressure to drop in the driving chamber of the cylinder, so that 'the more important the lower the load to be moved. However, when the piston reaches the end of its travel, the pressure of the working fluid rises again unnecessarily to reach the value of the pressure of the fluid distributor network.

A la fig. 1 a on a représenté la courbe A de pression P en fonction du temps T de déplacement du piston du vérin, le niveau de pression du réseau étant indiqué en B et la fin de course du piston étant indiquée en C.In fig. 1a there is shown the pressure curve A as a function of the time T of displacement of the piston of the jack, the pressure level of the network being indicated in B and the end of stroke of the piston being indicated in C.

A la fig. 1 b on a représenté une courbe D de pression en fonction du temps pour un même vérin équipé d'un limiteur de débit à l'échappement et une coube E pour un même vérin équipé d'un limiteur de débit à l'alimentation.In fig. 1b there is shown a pressure curve D as a function of time for the same cylinder equipped with an exhaust flow limiter and a curve E for the same cylinder equipped with a supply flow limiter.

On constate que la consommation d'air sera la même que le vérin soit ou non équipé d'un limiteur de débit réduisant la vitesse du piston. Pour remédier à cet inconvénient et réduire la consommation d'air comprimé d'un appareil utilisateur et notamment d'un vérin, on utilise un dispostiif suivant l'invention.It is noted that the air consumption will be the same whether or not the cylinder is equipped with a flow limiter reducing the speed of the piston. To remedy this drawback and reduce the consumption of compressed air from a user device and in particular from a jack, a device according to the invention is used.

Conformément à l'invention, le dispositif comporte un moyen assurant le passage du fluide moteur sous pression pendant la plus grande partie de la course de l'organe mobile du vérin et obturant ledit passage de fluide sous pression avant ou en fin de course dudit organe mobile.According to the invention, the device comprises a means ensuring the passage of the working fluid under pressure during the greater part of the stroke of the movable member of the jack and closing said passage of fluid under pressure before or at the end of the stroke of said member mobile.

A la fig. 1 c on a représenté la courbe F de pression par rapport au temps de déplacement du piston du même vérin qu'aux fig. 1 a et 1 b, cette courbe F correspondant à un vérin équipé d'un dispositif économiseur d'air suivant l'invention dans lequel on coupe le débit d'air comprimé vers la chambre motrice du vérin, soit avant, soit en fin de course C du piston du vérin. Cette disposition permet comme il est visible à la fig. 1 c d'économiser le volume d'air comprimé inutilement utilisé résultant de la différence entre la pression B du réseau de distribution d'air comprimé et la pression motrice suffisante pour amener le piston en fin de course dans les conditions de vitesse et de force d'appui nécessaires.In fig. 1 c the pressure curve F has been shown relative to the time of displacement of the piston of the same cylinder as in FIGS. 1 a and 1 b, this curve F corresponding to a jack fitted with an air saving device according to the invention in which the flow of compressed air is cut towards the driving chamber of the jack, either before or at the end of stroke C of the cylinder piston. This arrangement allows as it is visible in FIG. 1 c to save the volume of compressed air unnecessarily used resulting from the difference between the pressure B of the compressed air distribution network and the driving pressure sufficient to bring the piston to the end of its stroke under the conditions of speed and force support needed.

A la fig. 1 d on a représenté une courbe G pres- sion/temps d'un même vérin équipé d'un dispositif économiseur suivant l'invention et comportant un moyen de limitation de vitesse du piston. Cette disposition permet de réaliser des économies d'autant plus grandes que la vitesse sera faible.In fig. 1 d there is shown a pressure / time curve G of the same cylinder equipped with an economizer device according to the invention and comprising a means of speed limitation of the piston. This arrangement allows savings to be made the greater the lower the speed.

Le dispositif économiseur suivant l'invention est disposé de préférence entre l'orifice du vérin et la sortie du distributeur, le plus près possible de celui-ci.The economizer device according to the invention is preferably arranged between the orifice of the jack and the outlet of the dispenser, as close as possible to the latter.

Suivant une caractéristique de l'invention, il comporte un dispositif antiretour capable de laisser passer à plein débit l'air d'échappement du vérin lors du retour de l'organe mobile.According to a characteristic of the invention, it comprises a non-return device capable of allowing the exhaust air of the jack to pass at full flow when the movable member returns.

Suivant une autre caractéristique de l'invention, la fermeture de la soupape s'effectue sous la pression du fluide moteur.According to another characteristic of the invention, the valve is closed under the pressure of the working fluid.

D'autres caractéristiques et avantages de l'invention seront mieux compris à la lecture de la description qui va suivre de plusieurs modes de réalisation et en se référant aux dessins annexés, sur lesquels:

  • les fig. 1 a à 1 d sont des diagrammes représentant des courbes de pression en fonction du temps de déplacement d'un piston de vérin;
  • la fig. 2 est une vue en coupe d'un dispositif économiseur d'air comprimé à chute de pression suivant l'invention, représenté en milieu de cycle du vérin;
  • la fig. 3 est une même vue du même dispositif qu'à la fig. 2 en fin de cycle du vérin;
  • la fig. 4 est une vue en coupe d'un autre mode de réalisation du dispositif économiseur représenté en milieu de cycle du vérin;
  • la fig. 5 est une vue du même dispositif qu'à la fig. 4 en fin de cycle du vérin;
  • la fig. 6 est une vue en coupe d'un dispositif économiseur d'air comprimé commandé par un signal pneumatique et représenté en milieu de cycle du vérin;
  • la fig. 7 est une vue en coupe du même dispositif qu'à la fig. 6 en fin de cycle du vérin;
  • la fig. 8 est une vue en coupe axiale d'un dispositif économiseur à commande par chute de pression, monté entre un distributeur et une embase;
  • la fig. 9 est une vue en coupe axiale d'un dispositif économiseur piloté par un signal pneumatique, monté de la même manière;
  • la fig. 10 est une vue en coupe axiale d'un autre mode de réalisation d'un dispositif économiseur à commande par chute de pression;
  • la fig. 11 est une vue en coupe axiale d'un autre mode de réalisation d'un dispositif économiseur piloté par un signal pneumatique;
  • la fig. 12 est une vue en coupe axiale d'un dispositif économiseur disposé dans un raccord double;
  • la fig. 13 est une vue en plan du raccord de la fig. 12;
  • la fig. 14 est une vue en coupe axiale d'un manchon de réglage de pression pour le montage sur le dispositif à raccord double;
  • la fig. 15 est une vue en coupe axiale d'un autre mode de réalisation du dispositif économiseur monté dans un raccord double;
  • la fig. 16 est une vue en plan du raccord représenté à la fig. 15;
  • la fig. 17 est une vue en coupe axiale d'un manchon de réglage de pression;
  • la fig. 18 est une vue en coupe axiale d'un autre mode de réalisation de dispositif économiseur monté dans un raccord double;
  • la fig. 19 est une vue en plan du dispositif représenté à la fig. 18;
  • la fig. 20 est une vue en coupe longitudinale d'un dispositif économiseur monté dans un raccord simple.
Other characteristics and advantages of the invention will be better understood on reading the following description of several embodiments and with reference to the appended drawings, in which:
  • fig. 1 a to 1 d are diagrams representing pressure curves as a function of the displacement time of a cylinder piston;
  • fig. 2 is a sectional view of a compressed air saving device with a pressure drop according to the invention, shown in the middle of the cylinder cycle;
  • fig. 3 is the same view of the same device as in FIG. 2 at the end of the cylinder cycle;
  • fig. 4 is a sectional view of another embodiment of the economizer device shown in the middle of the cylinder cycle;
  • fig. 5 is a view of the same device as in FIG. 4 at the end of the cylinder cycle;
  • fig. 6 is a sectional view of a compressed air saving device controlled by a pneumatic signal and shown in the middle of the cylinder cycle;
  • fig. 7 is a sectional view of the same device as in FIG. 6 at the end of the cylinder cycle;
  • fig. 8 is an axial section view of an economizer device controlled by a pressure drop, mounted between a distributor and a base;
  • fig. 9 is an axial section view of an economizer device controlled by a pneumatic signal, mounted in the same way;
  • fig. 10 is an axial sectional view of another embodiment of a pressure drop control economizer;
  • fig. 11 is a view in axial section of another embodiment of an economizer device controlled by a pneumatic signal;
  • fig. 12 is an axial sectional view of an economizer device arranged in a double connector;
  • fig. 13 is a plan view of the connector of FIG. 12;
  • fig. 14 is an axial sectional view of a pressure adjusting sleeve for mounting on the device with double connection;
  • fig. 15 is an axial sectional view of another embodiment of the economizer device mounted in a double connector;
  • fig. 16 is a plan view of the connector shown in FIG. 15;
  • fig. 17 is an axial sectional view of a pressure adjusting sleeve;
  • fig. 18 is an axial sectional view of another embodiment of an economizer device mounted in a double connector;
  • fig. 19 is a plan view of the device shown in FIG. 18;
  • fig. 20 is a view in longitudinal section of an economizer device mounted in a simple connector.

Aux fig. 2 et 3, on a représenté un vérin 1 qui est relié à un distributeur pneumatique 2 par l'intermédiaire d'un dispositif 3 économiseur d'air comprimé suivant l'invention, ledit vérin 1 à double effet comportant un cylindre dans lequel se déplace un piston 4 relié par une tige 5 à une charge à déplacer. Par ailleurs le distributeur 2 est susceptible de mettre en communication ledit vérin avec un réseau 6 de distribution d'air comprimé et avec un orifice de purge 7 débouchant à l'atmosphère.In fig. 2 and 3, a cylinder 1 is shown which is connected to a pneumatic distributor 2 by means of a compressed air saving device 3 according to the invention, said double-acting cylinder 1 comprising a cylinder in which moves a piston 4 connected by a rod 5 to a load to be moved. Furthermore, the distributor 2 is capable of putting said cylinder in communication with a network 6 for distributing compressed air and with a purge orifice 7 opening to the atmosphere.

Le dispostiif économiseur d'air 3 comprend un corps 8 dans lequel sont montés deux ensembles économiseurs qui sont reliés respectivement par des conduits 9, 9a aux chambres 10, 10a du vérin 1, chaque ensemble comprenant une soupape 11, 11 montée coulissante avec interposition d'un joint d'étanchéité 12, 12a dans un alésage 13, 13a ménagé dans le corps 8, ladite soupape présentant à l'une de ses extrémités formant organe obturateur un joint d'étanchéité 14, 14a qui est susceptible d'obturer un orifice 15, 15a d'un siège 16,16a monté coulissant dans un logement 17, 17a en communication par un conduit 18, 18a avec le distributeur 2.The air-saving device 3 comprises a body 8 in which are mounted two economizer assemblies which are connected respectively by conduits 9, 9a to the chambers 10, 10a of the jack 1, each assembly comprising a valve 11, 11 mounted slidingly with interposition of 'A seal 12, 12a in a bore 13, 13a formed in the body 8, said valve having at one of its ends forming a sealing member a seal 14, 14a which is capable of closing an orifice 15, 15a of a seat 16, 16a mounted to slide in a housing 17, 17a in communication via a conduit 18, 18a with the distributor 2.

A leur extrémité opposée à l'organe obturateur, les soupapes 11, 11 a comportent un piston 19, 19a muni d'un joint d'étanchéité 20, 20a et se déplaçant dans un cylindre 21, 21 a ménagé dans le corps 8, ledit piston étant soumis sur sa face supérieure à l'action d'un ressort 22, 22a dont l'une des extrémités est en appui contre l'extrémité d'une vis 23, 23a engagée dans un trou taraudé 24, 24a prévu dans le corps 8 à la partie supérieure des cylindres 21,21 a. Le ressort 22, 22a tend à repousser la soupape 11, 11 a contre le siège 16, 16a.At their end opposite to the shutter member, the valves 11, 11 a comprise a piston 19, 19a provided with a seal 20, 20a and moving in a cylinder 21, 21 formed in the body 8, said piston being subjected on its upper face to the action of a spring 22, 22a, one end of which bears against the end of a screw 23, 23a engaged in a tapped hole 24, 24a provided in the body 8 at the upper part of the cylinders 21.21 a. The spring 22, 22a tends to push the valve 11, 11a against the seat 16, 16a.

L'espace 29, 29a ménagé entre le fond du cylindre 21, 21 a et la face du piston 19,19a opposée à la face d'appui du ressort est en communication par un conduit 26, 26a avec un conduit 27, 27a reliant le vérin aux logements 17, 17a au-dessus du siège 16, 16a.The space 29, 29a formed between the bottom of the cylinder 21, 21a and the face of the piston 19.19a opposite the bearing face of the spring is in communication by a conduit 26, 26a with a conduit 27, 27a connecting the cylinder housing 17, 17a above the seat 16, 16a.

Le vérin se déplaçant dans le sens de la flèche 28, la chambre motrice 10 est alimentée en fluide moteur P1 sous pression par les conduits 9 et 27, l'orifice 15 du siège 16 (la soupape 11 étant en position d'ouverture), le conduit 18 et le distributeur 2 qui est relié au réseau distributeur 6 d'air comprimé à la pression P.The jack moving in the direction of arrow 28, the driving chamber 10 is supplied with working fluid P1 under pressure by the conduits 9 and 27, the orifice 15 of the seat 16 (the valve 11 being in the open position), the conduit 18 and the distributor 2 which is connected to the distributor network 6 of compressed air at pressure P.

Par ailleurs, la chambre 10a du vérin 1 se trouvant en position de purge de l'air, il se produit dans ladite chambre une contrepression P2, de telle sorte que l'air s'écoule par les conduits 9a, 27a, l'orifice 15a (la soupape 11 a étant en position d'ouverture), le conduit 18a et le distributeur 2 qui est relié à l'atmosphère en 7.Furthermore, the chamber 10a of the jack 1 being in the air purge position, there occurs in said chamber a back pressure P2, so that the air flows through the conduits 9a, 27a, the orifice 15a (the valve 11a being in the open position), the conduit 18a and the distributor 2 which is connected to the atmosphere at 7.

Le conduit 27a étant relié par le conduit 26 à la chambre 29 située sous le piston 19, la contrepression P2 exerce sur ledit piston un effort à l'encontre du ressort 22 qui est comprimé, assurant ainsi l'ouverture de la soupape 11 permettant le passage du fluide moteur P1 vers la chambre 10 du vérin.The conduit 27a being connected by the conduit 26 to the chamber 29 located under the piston 19, the back pressure P2 exerts on the said piston a force against the spring 22 which is compressed, thus ensuring the opening of the valve 11 allowing the passage of the working fluid P1 towards the chamber 10 of the jack.

D'autre part, le conduit 27 étant relié par le conduit 26a à la chambre 29a située sous le piston 19a, la pression motrice P1 exerce sur ledit piston un effort à l'encontre du ressort 22a, qui est comprimé, assurant ainsi l'ouverture de la soupape 11 a permettant le passage du fluide d'échappement à la contrepression P2 vers le distributeur 2 et vers l'atmosphère en 7.On the other hand, the conduit 27 being connected by the conduit 26a to the chamber 29a located under the piston 19a, the driving pressure P1 exerts on said piston a force against the spring 22a, which is compressed, thus ensuring the opening of the valve 11 a allowing the passage of the exhaust fluid at the back pressure P2 towards the distributor 2 and towards the atmosphere at 7.

Lorsque le piston 4 du vérin arrive en fin de course, comme représenté à la fig. 3, la contrepression P2 dans la chambre 10 d'échappement devient nulle et par suite le fluide s'échappe de l'espace 29 sous le piston 19 de telle sorte que la soupape 11 sous l'action du ressort 22 repousse celle-ci en position de fermeture contre l'orifice 15 du siège 16 qui est soulevé par la pression motrice P.When the piston 4 of the jack reaches the end of the stroke, as shown in FIG. 3, the back pressure P2 in the exhaust chamber 10 becomes zero and consequently the fluid escapes from the space 29 under the piston 19 so that the valve 11 under the action of the spring 22 pushes the latter back closed position against the orifice 15 of the seat 16 which is raised by the driving pressure P.

De ce fait, l'alimentation de la chambre 10 du vérin 1 en fluide moteur sous la pression P1 est interrompue; toutefois, le fluide demeurant dans la chambre 10, dans les conduits 27, 26a et dans l'espace 29a sous le piston 19a maintient la soupape 11 a en position d'ouverture permettant ainsi la complète évacuation du fluide à l'échappement.Therefore, the supply of the chamber 10 of the cylinder 1 with working fluid under the pressure P1 is interrupted; however, the fluid remaining in the chamber 10, in the conduits 27, 26a and in the space 29a under the piston 19a maintains the valve 11a in the open position, thus allowing complete evacuation of the fluid at the exhaust.

A l'inversion du distributeur, la position des soupapes 11,11 a est inversée par rapport à la fig. 2, de manière à provoquer le déplacement du piston 4 dans le sens inverse de la flèche 28.When the distributor is inverted, the position of the valves 11,11 a is reversed with respect to FIG. 2, so as to cause the piston 4 to move in the opposite direction to the arrow 28.

Afin de régler le débit et par suite la vitesse du piston 4 du vérin 1, on règle la dureté des ressorts 22,22a en comprimant ceux-ci au moyen des vis 23, 23a, à partir d'une certaine compression des ressorts 22, 22a le dispositif fonctionne en détendeur.In order to adjust the flow rate and consequently the speed of the piston 4 of the jack 1, the hardness of the springs 22, 22a is adjusted by compressing them by means of the screws 23, 23a, starting from a certain compression of the springs 22, 22a the device operates as a regulator.

Dans ce cas, la contrepression d'échappement qui diminue pendant la course est vaincue par le ressort avant la fin de course. La course se poursuit par la seule détente de l'air déjà admis dans la chambre motrice.In this case, the exhaust back pressure which decreases during the race is overcome by the spring before the end of the race. The race continues with the only relaxation of the air already admitted into the engine room.

Aux fig. 4 et 5, on a représenté une variante de réalisation du dispositif économiseur dans laquelle la force requise pour la fermeture de la soupape à la disparition de la contrepression d'échappement n'est plus fournie par le ressort 22, 22a mais par la pression du fluide moteur P1.In fig. 4 and 5, there is shown an alternative embodiment of the economizer device in which the force required for closing the valve when the exhaust backpressure disappears is no longer supplied by the spring 22, 22a but by the pressure of the P1 engine fluid.

A cet effet, le piston 19,19a est prolongé par une partie 30, 30a de moindre section que le piston 19, 19a et se déplaçant dans un logement cylindrique 31, 31 a.To this end, the piston 19,19a is extended by a part 30, 30a of smaller section than the piston 19, 19a and moving in a cylindrical housing 31, 31 a.

Par ailleurs, la soupape 11, 11 a présente un canal axial 32, 32a débouchant à sa partie supérieure dans l'espace 31, 31 a et à sa partie inférieure dans le conduit 27.Furthermore, the valve 11, 11 a has an axial channel 32, 32a opening at its upper part into the space 31, 31 a and at its lower part in the conduit 27.

Cette disposition permet d'amener le fluide moteur P1 dans l'espace 31 (fig. 4) où sa pression sur la partie 30 du piston 19 s'exerce à l'encontre du fluide sous pression se trouvant dans la chambre 29 sous le piston 19; or, la section de la partie 30 étant inférieure à celle du piston 19 soumis à la pression du fluide d'échappement P2, la soupape 11 est maintenue en position ouverte contre la vis 23 qui permet de réduire à volonté le débit et, par conséquent, la vitesse du vérin; la consommation d'air étant d'autant plus faible que la vitesse est réduite.This arrangement makes it possible to bring the working fluid P1 into the space 31 (fig. 4) where its pressure on the part 30 of the piston 19 is exerted against the pressurized fluid located in the chamber 29 under the piston 19; however, the section of the part 30 being smaller than that of the piston 19 subjected to the pressure of the exhaust fluid P2, the valve 11 is held in the open position against the screw 23 which makes it possible to reduce the flow rate as desired and, therefore, the speed of the cylinder; the air consumption being lower the lower the speed.

Lorsque la pression P2 disparaît dans la chambre 29, le fluide sous pression dans la chambre 31 repousse le piston de la soupape 11 vers le bas en position de fermeture (fig. 5).When the pressure P2 disappears in the chamber 29, the fluid under pressure in the chamber 31 pushes the piston of the valve 11 downwards in the closed position (fig. 5).

Auxfig. 6 et 7, on a représenté un autre mode de réalisation du dispositif économiseur dans lequel le piston 19 est commandé par un signal pneumatique correspondant à une position du piston 4 du vérin 1 avant ou en fin de course.Auxfig. 6 and 7, another embodiment of the economizer device has been shown in which the piston 19 is controlled by a pneumatic signal corresponding to a position of the piston 4 of the jack 1 before or at the end of the stroke.

Dans ce but, une chambre 33, 33a située au-dessus du piston 19, 19a est reliée par un conduit 34, 34a à une cellule 35, 35a ou capteur de fin de course alimenté à partir d'un conduit 36, 36a et d'un distributeur 37, 37a reliant sélectivement la cellule à une source de fluide sous pression et à l'atmosphère.For this purpose, a chamber 33, 33a situated above the piston 19, 19a is connected by a conduit 34, 34a to a cell 35, 35a or limit switch supplied from a conduit 36, 36a and d a distributor 37, 37a selectively connecting the cell to a source of pressurized fluid and to the atmosphere.

Les cellules 35, 35a présentent un palpeur 38, 38a susceptible de venir en contact avec une partie 39 de la tige 5 du piston 4, de telle sorte que lorsque la cellule 35, 35a est actionnée elle envoie un signal pneumatique dans la chambre 33, 33a qui repousse le piston 19,19a vers le bas et assure la fermeture de la soupape 11, 11 a.The cells 35, 35a have a feeler 38, 38a capable of coming into contact with a part 39 of the rod 5 of the piston 4, so that when the cell 35, 35a is actuated it sends a pneumatic signal to the chamber 33, 33a which pushes the piston 19,19a down and ensures the closing of the valve 11, 11 a.

Lorsque le piston 4 du vérin 1 se déplace suivant la flèche 28 (fig. 6), la pression motrice P arrivant en 18 par le distributeur 2 repousse le siège 16 en position de fermeture et, la chambre 33 étant hors pression, soulève la soupape 11 en position d'ouverture alimentant ainsi par le conduit 27 la chambre 10 du vérin.When the piston 4 of the cylinder 1 moves in the direction of arrow 28 (fig. 6), the driving pressure P arriving at 18 through the distributor 2 pushes the seat 16 back to the closed position and, the chamber 33 being unpressurized, raises the valve 11 in the open position thus supplying via the conduit 27 the chamber 10 of the jack.

Par ailleurs, la chambre 33a étant également hors pression et la soupape étant en position ouverte, le fluide à la pression P2 s'échappe de la chambre 1 Oa du vérin par le conduit 27a et le distributeur 2.Furthermore, the chamber 33a also being unpressurized and the valve being in the open position, the fluid at the pressure P2 escapes from the chamber 1a of the jack via the conduit 27a and the distributor 2.

Lorsque le piston 4 arrive en fin de course (fig. 7) et que la partie 39 de la tige 5 du piston vient en contact avec le palpeur 38 de la cellule 35, celle-ci, alimentée par le distributeur 37, envoie un signal pneumatique ou une certaine quantité de fluide dans la chambre 33 qui repousse le piston 19 vers le bas ainsi que la soupape 1 qui vient en position de fermeture sur le siège 16. La chambre 29 étant reliée à l'atmosphère par l'orifice 40, le piston 19 peut se déplacer sans rencontrer une force quelconque.When the piston 4 reaches the end of the stroke (fig. 7) and the part 39 of the piston rod 5 comes into contact with the probe 38 of the cell 35, the latter, supplied by the distributor 37, sends a signal pneumatic or a certain amount of fluid in the chamber 33 which pushes the piston 19 downwards as well as the valve 1 which comes into the closed position on the seat 16. The chamber 29 being connected to the atmosphere by the orifice 40, the piston 19 can move without encountering any force.

Par ailleurs, lorsque le piston 4 arrive en fin de course, la chambre 1 Oa et le conduit 27a se vident instantanément, de telle sorte que la contrepression P2 disparaît.Furthermore, when the piston 4 reaches the end of its travel, the chamber 1 Oa and the conduit 27a are instantly emptied, so that the back pressure P2 disappears.

A l'inversion du distributeur 2, bien que la soupape 11 soit encore poussée en position de fermeture par la cellule 35, la disparition de la pression du réseau à l'entrée 18 permet l'échappement par le recul du siège 16 qui vient occuper une position d'ouverture.When the distributor 2 is inverted, although the valve 11 is still pushed into the closed position by the cell 35, the disappearance of the network pressure at the inlet 18 allows the exhaust by the recoil of the seat 16 which occupies an open position.

Comme dans le mode de réalisation des fig. 4 et 5, les vis 23, 23a permettent de régler le débit de fluide et, par suite, la vitesse du piston 4 du vérin.As in the embodiment of FIGS. 4 and 5, the screws 23, 23a make it possible to adjust the fluid flow rate and, consequently, the speed of the piston 4 of the jack.

La cellule 35, 35a, ou capteur de fin de course, peut être remplacée par un capteur de passage de l'organe mobile ou piston 4 du vérin.The cell 35, 35a, or end of stroke sensor, can be replaced by a sensor for the passage of the movable member or piston 4 of the jack.

Il est également possible d'utiliser un capteur à chute de pression délivrant un signal pneumatique à partir de la chute de pression du vérin du côté échappement.It is also possible to use a pressure drop sensor delivering a pneumatic signal from the pressure drop of the cylinder on the exhaust side.

Suivant un autre mode de réalisation, on utilise un signal pneumatique issu d'un circuit associé au mouvement d'un autre vérin déclenchant tout de suite après la fin de la course du piston du vérin de commande.According to another embodiment, a pneumatic signal is used coming from a circuit associated with the movement of another jack triggering immediately after the end of the stroke of the piston of the control jack.

A la fig. 8, on a représenté un dispositif économiseur d'air comprimé suivant l'invention qui comprend un corps 41 monté entre un distributeur 42 et une embase 43 avec lesquels il est en contact par deux de ses faces 44 et 45, ladite embase 43 présentant des canaux intégrés dont un canal 46 relié au distributeur d'air comprimé, des canaux 47, 47a reliés à l'atmosphère et des canaux 48, 48a reliés aux chambres 10, 10a du vérin 1. Les canaux 46, 47, 47a, 48, 48a de fluide débouchent sur l'une des faces 45 du corps 41 qui présente sur son autre face 44 des orifices débouchant dans les conduits du distributeur 42.In fig. 8, there is shown a compressed air saving device according to the invention which comprises a body 41 mounted between a distributor 42 and a base 43 with which it is in contact by two of its faces 44 and 45, said base 43 having integrated channels including a channel 46 connected to the compressed air distributor, channels 47, 47a connected to the atmosphere and channels 48, 48a connected to the chambers 10, 10a of the jack 1. Channels 46, 47, 47a, 48, 48a of fluid open onto one of the faces 45 of the body 41 which has on its other face 44 orifices opening into the conduits of the distributor 42.

A chaque extrémité du corps 41 il est prévu un alésage dans lequel est monté un manchon 49,49a présentant un cylindre fermé par un bouchon vissé 50, 50a et dans lequel est monté coulissant un piston 51,51 d'une soupape 11,11 a présentant un organe obturateur ou joint 52, 52a susceptible de venir obturer un orifice 53, 53a.At each end of the body 41 there is provided a bore in which is mounted a sleeve 49,49a having a cylinder closed by a screw cap 50, 50a and in which is slidably mounted a piston 51,51 of a valve 11,11 a having a shutter member or joint 52, 52a capable of closing a hole 53, 53a.

Le piston 51 est soumis sur l'une de ses faces à l'action d'un ressort 54, 54a qui maintient les clapets 11,11 a en postiion d'ouverture, en l'absence de fluide sous pression.The piston 51 is subjected on one of its faces to the action of a spring 54, 54a which keeps the valves 11, 11 a in the open position, in the absence of pressurized fluid.

Par ailleurs, le corps 41 comporte un conduit 55, 55a dans lequel est monté un clapet antiretour 56, 56a soumis à l'action d'un ressort 57, 57a qui assure seulement le passage des chambres 10, 10a vers l'échappement 47, 47a. Ledit conduit 55, 55a est en communication d'un côté du clapet 56, 56a par l'orifice 53,53a avec une chambre 58,58a et de l'autre côté du clapet par un orifice 59, 59a.Furthermore, the body 41 includes a duct 55, 55a in which is mounted a non-return valve 56, 56a subjected to the action of a spring 57, 57a which only ensures the passage of the chambers 10, 10a towards the exhaust 47, 47a. Said conduit 55, 55a is in communication on one side of the valve 56, 56a through the orifice 53.53a with a chamber 58.58a and on the other side of the valve by an orifice 59, 59a.

Le clapet 11, 11 a présente un conduit axial 61, 61 a mettant en communication la chambre 58,58a avec la chambre 62,62a et un conduit 63,63a relie le conduit 55, 55a à une chambre 64, 64a placée sous le piston 51, 51 a.The valve 11, 11a has an axial duct 61, 61a putting the chamber 58,58a in communication with the chamber 62,62a and a duct 63,63a connects the duct 55, 55a to a chamber 64, 64a placed under the piston 51, 51 a.

Lorsque le piston 4 du vérin 1 se déplace suivant la flèche 60, le fluide moteur, provenant du conduit 46 et dirigé par le distributeur 42 dans le conduit 55a, passe par l'orifice 53a et l'orifice 59a en traversant la chambre 58a, la soupape 11 a étant en position d'ouverture sous l'action conjuguée du ressort 54a et du fluide d'échappement en provenance du conduit 55 et du conduit 63a qui aboutit à la chambre 64a, la force conjuguée du ressort 54a et de la pression du fluide d'échappement étant supérieure à la force exercée par la pression du fluide moteur dans la chambre 62 délimitée par le joint 65a.When the piston 4 of the jack 1 moves along arrow 60, the working fluid, coming from the duct 46 and directed by the distributor 42 in the duct 55a, passes through the orifice 53a and the orifice 59a by passing through the chamber 58a, the valve 11a being in the open position under the combined action of the spring 54a and the exhaust fluid coming from the duct 55 and the duct 63a which terminates in the chamber 64a, the combined force of the spring 54a and the pressure of the exhaust fluid being greater than the force exerted by the pressure of the working fluid in the chamber 62 delimited by the seal 65a.

Par contre, lorsque le piston 4 du vérin arrive en fin de course, la pression du fluide d'échappement en provenance de la chambre 10 disparaît dans la chambre 64a et, la pression qui s'exerce dans la chambre 62a étant plus forte que l'action du ressort 54a, la soupape 11 a se ferme interrompant le passage par l'orifice 53a et l'action du fluide moteur dans la chambre 1 Oa du vérin 1.On the other hand, when the piston 4 of the jack reaches the end of the stroke, the pressure of the exhaust fluid from the chamber 10 disappears in the chamber 64a and, the pressure exerted in the chamber 62a being stronger than the action of the spring 54a, the valve 11 a closes interrupting the passage through the orifice 53a and the action of the working fluid in the chamber 1 Oa of the jack 1.

Par ailleurs, pendant le déplacement du piston 4, le fluide s'échappe de la chambre 10 vers le conduit 47 en ouvrant le clapet 56 et en traversant le distributeur 42.Furthermore, during the displacement of the piston 4, the fluid escapes from the chamber 10 towards the conduit 47 by opening the valve 56 and passing through the distributor 42.

A la fig. 9, on a représenté une variante de réalisation du dispositif économiseur dont le corps 41 est monté de la même manière qu'à la fig. 8 entre le distributeur 42 et l'embase 43.In fig. 9, an alternative embodiment of the economizer device is shown, the body 41 of which is mounted in the same manner as in FIG. 8 between the distributor 42 and the base 43.

Toutefois, le piston 51, 51 a n'est pas relié à la chambre 58, 58a et le bouchon 50, 50a présente un conduit 66, 66a qui est relié notamment à un capteur de position du piston 4 avant ou en fin de course qui délivre dans la chambre 62, 62a un signal pneumatique ou une certaine quantité de fluide qui repousse le piston 51 et la soupape 11, 11 a en position de fermeture.However, the piston 51, 51 a is not connected to the chamber 58, 58a and the plug 50, 50a has a conduit 66, 66a which is connected in particular to a position sensor of the piston 4 before or at the end of the stroke which delivers in the chamber 62, 62a a pneumatic signal or a certain quantity of fluid which pushes the piston 51 and the valve 11, 11 a in the closed position.

A la fig. 10 on a représenté une variante de réalisation du dispositif économiseur double d'air comprimé dont le corps 41 est monté de la même manière qu'à la fig. 8 entre le distributeur 2 et l'embase 43. Dans ce cas, un clapet 67, 67a soumis à l'action d'un ressort 79, 79a est maintenu en position ouverte par rapport à l'orifice 68, 68a qui relie les conduits 69, 69a aboutissant aux chambres 10 et 1 Oa du vérin et les conduits 70, 70a reliés sélectivement par le distributeur 42 au réseau d'air comprimé et à l'atmosphère.In fig. 10 there is shown an alternative embodiment of the dual compressed air economizer device whose body 41 is mounted in the same manner as in FIG. 8 between the distributor 2 and the base 43. In this case, a valve 67, 67a subjected to the action of a spring 79, 79a is held in the open position relative to the orifice 68, 68a which connects the conduits 69, 69a leading to the chambers 10 and 1 Oa of the jack and the conduits 70, 70a selectively connected by the distributor 42 to the compressed air network and to the atmosphere.

Le clapet 67, 67a comporte une tige 71, 71 a qui est montée librement coulissante dans un trou borgne du piston 72, 72a qui se déplace dans un cylindre prévu dans une chemise 73, 73a montée de façon étanche dans le corps 41, ledit piston 72, 72a étant soumis sur sa face de plus grande section à l'action d'un ressort 74, 74a en appui contre un manchon 75, 75a vissé dans la chemise 73, 73a, ledit manchon étant susceptible d'être actionné par un bouchon 76, 76a afin de régler la pression du ressort 74, 74a.The valve 67, 67a comprises a rod 71, 71 a which is mounted to slide freely in a blind hole in the piston 72, 72a which moves in a cylinder provided in a jacket 73, 73a mounted in leaktight manner in the body 41, said piston 72, 72a being subjected on its face of larger section to the action of a spring 74, 74a bearing against a sleeve 75, 75a screwed into the jacket 73, 73a, said sleeve being capable of being actuated by a plug 76, 76a in order to adjust the pressure of the spring 74, 74a.

Par ailleurs, les chambres 77, 77a sont reliées aux conduits 70, 70a par des conduits 78, 78a.Furthermore, the chambers 77, 77a are connected to the conduits 70, 70a by conduits 78, 78a.

Lorsque la chambre 10a est alimentée en fluide moteur par les conduits 70a et 69a, le clapet 67a est en position ouverte repoussé par le piston 72 sur lequel agissent le ressort 74a et la pression d'échappement dans la chambre 77a à l'encontre de l'action du fluide moteur agissant sur la plus faible section du piston sur la face opposée.When the chamber 10a is supplied with working fluid through the conduits 70a and 69a, the valve 67a is in the open position pushed back by the piston 72 on which the spring 74a and the exhaust pressure act in the chamber 77a against the action of the working fluid acting on the smallest section of the piston on the opposite face.

Dès que la pression du fluide d'échappement disparaît dans la chambre 77a, le ressort 74a est comprimé sous l'action de la pression du fluide moteur et le piston 72a se déplace contre le manchon 75a permettant ainsi au clapet 67a sous l'action de la pression du fluide moteur de venir obturer l'orifice 68a et d'interrompre le passage du fluide moteur entre les conduits 70a et 69a vers la chambre motrice 10a.As soon as the pressure of the exhaust fluid disappears in the chamber 77a, the spring 74a is compressed under the action of the pressure of the working fluid and the piston 72a moves against the sleeve 75a thus allowing the valve 67a under the action of the pressure of the working fluid to close off the orifice 68a and to interrupt the passage of the working fluid between the conduits 70a and 69a towards the driving chamber 10a.

Par ailleurs, le fluide d'échappement en provenance de la chambre 10 traverse les conduits 69 et 70, le clapet 67 étant en position ouverte, et se dirige par l'intermédiaire du distributeur 42 vers le canal d'échappement 47.Furthermore, the exhaust fluid coming from the chamber 10 passes through the conduits 69 and 70, the valve 67 being in the open position, and goes via the distributor 42 towards the exhaust channel 47.

A la fig. 11 on a représenté un dispositif économiseur dont le corps 41 est monté entre un distributeur 42 et une embase 43 ainsi qu'il a été représenté à la fig. 8. Le dispositif est identique à celui de la fig. 10, toutefois les bouchons 76, 76a comportent des conduits 80, 80a qui sont reliés à des capteurs de position du piston 4 avant ou en fin de course qui délivrent un signal pneumatique.In fig. 11 there is shown an economizer device the body 41 of which is mounted between a distributor 42 and a base 43 as shown in FIG. 8. The device is identical to that of FIG. 10, however, the plugs 76, 76a include conduits 80, 80a which are connected to position sensors of the piston 4 before or at the end of the stroke which deliver a pneumatic signal.

Le piston 72, 72a est prolongé par une tige 81, 81 a s'étendant à travers le manchon 75, 75a et dans le bouchon 76, 76a, ladite tige 81, 81 a présentant un conduit 82, 82a en communication d'un côté avec le conduit 80, 80a et de l'autre avec la chambre 83, 83a disposée sous le piston 72. Lorsqu'un signal pneumatique est émis à l'une des extrémités et transmis par les conduits 80, 80a et 82, 82a, le piston 72, 72a est soulevé à l'encontre du ressort 74, 74a, de telle sorte que le clapet 67, 67a se ferme sous l'action de la pression du fluide moteur provenant du conduit 70, 70a.The piston 72, 72a is extended by a rod 81, 81 a extending through the sleeve 75, 75a and in the plug 76, 76a, said rod 81, 81 a having a conduit 82, 82a in communication on one side with the conduit 80, 80a and on the other with the chamber 83, 83a arranged under the piston 72. When a pneumatic signal is emitted at one of the ends and transmitted by the conduits 80, 80a and 82, 82a, the piston 72, 72a is raised against the spring 74, 74a, so that the valve 67, 67a closes under the action of the pressure of the working fluid coming from the conduit 70, 70a.

Aux fig. 12,13 on a représenté un dispositif économiseur qui comprend un corps de raccord double constitué de deux éléments 84, 84a en forme de T reliés entre eux par une nervure 85 et disposés avec leurs axes parallèles. Chaque élément 84, 84a du corps (fig. 12) présente à ses deux extrémités des conduits 86, 86a de circulation du fluide qui sont munis de moyens de raccordement 87, 87a avec des tuyaux extérieurs, ledit élément du corps présentant dans sa partie centrale un alésage 88 perpendiculaire aux conduits 86, 86a et dans lequel est montée une soupape 89 qui comporte un organe obturateur 90 solidaire d'un piston 91 monté coulissant dans un cylindre prévu d'un côté de l'alésage 88 et fermé par un bouchon 92 contre lequel est en appui l'une des extrémités d'un ressort 93 dont l'autre extrémité agit en combinaison avec la pression d'échappement contre le piston 91. L'autre extrémité de l'alésage est fermée par un bouchon 94 portant une membrane déformable 95 formant clapet antiretour et une vis 96 engagée dans un trou taraudé du bouchon 94, ladite vis 96 limitant la course de la soupape 89 et permettant de régler la vitesse du piston du vérin. Le fonctionnement de ce dispositif est identique à celui du dispositif représenté à la fig. 10 et qui a été décrit ci-dessus.In fig. 12,13 there is shown an economizer device which comprises a double connection body consisting of two elements 84, 84a in the form of a T connected together by a rib 85 and arranged with their parallel axes. Each element 84, 84a of the body (fig. 12) has at its two ends conduits 86, 86a for circulation of the fluid which are provided with connection means 87, 87a with external pipes, said element of the body having in its central part a bore 88 perpendicular to the conduits 86, 86a and in which is mounted a valve 89 which comprises a shutter member 90 integral with a piston 91 slidably mounted in a cylinder provided on one side of the bore 88 and closed by a plug 92 against which one of the ends of a spring 93 bears, the other end of which acts in combination with the exhaust pressure against the piston 91. The other end of the bore is closed by a plug 94 carrying a deformable membrane 95 forming a non-return valve and a screw 96 engaged in a tapped hole in the plug 94, said screw 96 limiting the stroke of the valve 89 and making it possible to adjust the speed of the piston of the jack. The operation of this device is identical to that of the device shown in FIG. 10 and which has been described above.

Suivant une variante de réalisation (fig. 14), il est possible de remplacer le bouchon 92 par un manchon d'obturation 97 monté dans l'alésage 88 et présentant un trou taraudé dans lequel est vissée la partie filetée d'une tige 98 assurant le réglage de la tension du ressort 93 qui agit sur le piston 91 afin de faire varier la pression de sortie. La tige 98 est prolongée par une tête de manoeuvre 99 comportant des bagues de couleur 100 permettant de visualiser l'économie.According to an alternative embodiment (fig. 14), it is possible to replace the plug 92 by a sealing sleeve 97 mounted in the bore 88 and having a tapped hole in which is screwed the threaded part of a rod 98 ensuring adjusting the tension of the spring 93 which acts on the piston 91 in order to vary the outlet pressure. The rod 98 is extended by an operating head 99 comprising colored rings 100 enabling the economy to be viewed.

Aux fig. 15 et 16 on a représenté une variante de réalisation d'un dispositif économiseur qui comprend un corps de raccord double 101 en forme de bloc compact et qui renferme deux ensembles économiseurs identiques à celui représenté à la fig. 12 et qui a été décrit ci-dessus. De la même manière la fig. 17 représente un manchon de réglage 97 qui peut être monté en remplacement du bouchon 92 pour le réglage du ressort 93 et la pression de sortie du fluide.In fig. 15 and 16 there is shown an alternative embodiment of an economizer device which comprises a double connector body 101 in the form of a compact block and which contains two economizer assemblies identical to that shown in FIG. 12 and which has been described above. In the same way fig. 17 shows an adjustment sleeve 97 which can be mounted to replace the plug 92 for adjusting the spring 93 and the fluid outlet pressure.

Aux fig. 18 et 19, on a représenté un dispositif économiseur qui comprend un corps de raccord double constitué de deux éléments 84, 84a en forme de T, reliés entre eux par une nervure 85 et disposés avec leurs axes parallèles.In fig. 18 and 19, there is shown an economizer device which comprises a double connection body consisting of two elements 84, 84a in the form of a T, connected together by a rib 85 and arranged with their parallel axes.

Chaque élément 84, 84a du corps (fig. 18) présente à ses deux extrémités des conduits 86, 86a de circulation du fluide qui sont munis de moyens de raccordement 87, 87a avec des tuyaux extérieurs, ledit élément présentant dans sa partie centrale un alésage 102 perpendiculaire aux conduits 86,86a. D'un côté de l'alésage 102 est monté un bouchon 103 contre lequel est en appui un ressort 104 repoussant un clapet 105 contrôlant le passage du fluide moteur et d'échappement, ledit clapet 105 étant prolongé par une tige 106 montée coulissante dans un trou borgne d'un piston 107 coulissant dans l'alésage 102, ledit piston étant soumis sur l'une de ses faces à l'action d'un ressort 108 en appui contre un bouchon de réglage 109 vissé dans l'alésage central et à l'action du fluide d'échappement.Each element 84, 84a of the body (fig. 18) has at its two ends conduits 86, 86a for circulation of the fluid which are provided with connection means 87, 87a with external pipes, said element having in its central part a bore 102 perpendicular to the conduits 86,86a. On one side of the bore 102 is mounted a plug 103 against which a spring 104 pushes against a valve 105 controlling the passage of the working and exhaust fluid, said valve 105 being extended by a rod 106 slidably mounted in a blind hole of a piston 107 sliding in the bore 102, said piston being subjected on one of its faces to the action of a spring 108 bearing against an adjustment plug 109 screwed into the central bore and the action of the exhaust fluid.

Le fonctionnement de ce dispositif est identique à celui du dispositif représenté à la fig. 10 et qui a été décrit ci-dessus.The operation of this device is identical to that of the device shown in FIG. 10 and which has been described above.

A la fig. 20 on a représenté un dispositif économiseur qui comprend un raccord simple 110 renfermant une soupape 111 de contrôle de passage du fluide et présentant un orifice 112 relié par un conduit 113 à une chambre 10 d'un vérin 1 et un conduit 114 relié à un distributeur 115 susceptible de mettre en communication ladite chambre 10 avec une source de fluide sous pression et l'atmosphère.In fig. 20 there is shown an economizer device which comprises a simple connector 110 enclosing a valve 111 for controlling the passage of the fluid and having an orifice 112 connected by a conduit 113 to a chamber 10 of a jack 1 and a conduit 114 connected to a distributor 115 capable of bringing said chamber 10 into communication with a source of pressurized fluid and the atmosphere.

L'autre chambre 10a du vérin est reliée par un conduit 116 directement au distributeur 115, mais il serait évidemment possible de monter sur le conduit 116 un raccord simple identique au raccord 110 qui comporte un dispositif économiseur. Le raccord 110 comprend un corps principal 117 présentant à sa base une partie filetée 130 pour son montage dans un trou taraudé d'un organe de support ou de raccordement, ou du distributeur 115, ledit corps 117 renfermant une soupape 111 de contrôle de passage de fluide commandée par un piston 118 soumis à l'action d'un signal pneumatique ou d'une certaine quantité de fluide dirigée dans une chambre 119 ménagée entre la partie supérieure du piston et un bouchon 120 vissé dans une partie taraudée du corps 117, ledit bouchon étant percé d'un conduit 121 relié par un conduit 122 à un capteur 123 de la position du piston 4 du vérin.The other chamber 10a of the jack is connected by a conduit 116 directly to the distributor 115, but it would obviously be possible to mount on the conduit 116 a simple connector identical to the connector 110 which includes an economizer device. The connector 110 comprises a main body 117 having at its base a threaded portion 130 for mounting in a tapped hole of a support or connection member, or of the distributor 115, said body 117 containing a valve 111 for controlling passage of fluid controlled by a piston 118 subjected to the action of a pneumatic signal or of a certain quantity of fluid directed into a chamber 119 formed between the upper part of the piston and a plug 120 screwed into a tapped part of the body 117, said plug being pierced with a conduit 121 connected by a conduit 122 to a sensor 123 of the position of the piston 4 of the jack.

Dans le conduit 114 il est prévu un siège mobile 124 qui est repoussé contre un épaulement du corps et contre l'organe obturateur de la soupape par un ressort 125.In the conduit 114 there is provided a movable seat 124 which is pushed against a shoulder of the body and against the valve shutter member by a spring 125.

Le corps principal 117 reçoit une douille 126 comportant une tubulure 127 mettant en communication le conduit 113 avec le conduit 114 par l'espace entre la soupape 111 et le corps principal par l'orifice 128 et par le conduit 112 de la tubulure 127. Lorsque le piston 4 se déplace suivant la flèche 129, la soupape 111 est en position d'ouverture du fait que la chambre 119 ne contient aucun fluide et qu'elle est en position haute, le distributeur alimente le conduit 114 et la chambre 10 en fluide moteur, alors que la chambre 10a est reliée par le conduit 116 et le distributeur 115 à l'échappement vers l'atmosphère.The main body 117 receives a socket 126 comprising a tube 127 putting the conduit 113 in communication with the conduit 114 through the space between the valve 111 and the main body through the orifice 128 and through the conduit 112 of the tube 127. When the piston 4 moves along the arrow 129, the valve 111 is in the open position because the chamber 119 contains no fluid and that it is in the high position, the distributor supplies the conduit 114 and the chamber 10 with fluid engine, while the chamber 10a is connected by the conduit 116 and the distributor 115 to the exhaust to the atmosphere.

Dès que le piston 4 arrive en fin de course ou avant la fin de course, il agit sur le capteur 123 qui envoie un signal pneumatique dans la chambre 19 repoussant le piston 18 vers le bas et la soupape 111 contre le siège 124 obturant ainsi le pa- sage vers la chambre 10 dont l'alimentation en fluide moteur est interrompue.As soon as the piston 4 reaches the end of the race or before the end of the race, it acts on the sensor 123 which sends a pneumatic signal in the chamber 19 pushing the piston 18 downwards and the valve 111 against the seat 124 thus closing the passage towards chamber 10, the supply of working fluid of which is interrupted.

Lorsque la chambre 10 est en phase d'échappement, le siège 124 formant clapet est repoussé contre l'action du ressort 125 permettant ainsi l'échappement vers l'atmosphère par le distributeur 115.When the chamber 10 is in the exhaust phase, the seat 124 forming a valve is pushed back against the action of the spring 125 thus allowing the exhaust to the atmosphere by the distributor 115.

Claims (28)

1. Compressed air saving device (3) enabling the adjustment at a pressure inferior to that of a distributor network (6) of the pressure of the driving fluid of a utilizing apparatus, particularly of a jack (1 ), characterized in that it comprises a means (11, 11a) ensuring the passage of the pressurized driving fluid during the main part of the stroke of the movable member (4) of the jack (1) and obturating said passage of pressurized fluid before or at the end of stroke of said movable member (4).
2. Saving device according to Claim 1, characterized in that it comprises a non-return device (16) adapted to let the exhaust air of the jack (1) pass at full rate when the movable member (4) returns.
3. Saving device according to Claims 1 or 2, characterized in that the means for controlling the passage of the pressurized driving fluid is constituted by a valve (11, 11 a) opening and remaining open under the action of the pressure of the fluid prevailing in the jack chamber (10,1 Oa) upon exhaust and shutting when the pressure of the fluid disappears under the action of an elastic member (22, 22a).
4. Saving device according to Claim 3, characterized in that the shutting of the valve (11,11 a) is carried out under the pressure of the driving fluid.
5. Saving device according to Claims 1 or 2, characterized in that the means for controlling the passage of the driving fluid is constituted by a valve (11, 11 a) opening under the action of the pressure of the driving fluid and shutting in replyto a pneumatic signal corresponding to a position of the movable member (4) of the jack (1) before or at the end of the stroke.
6. Saving device according to Claim 5, characterized in that the position sensor is a sensor of passage of the movable member.
7. Saving device according to Claim 5, characterized in that the position sensor is an end-of- stroke sensor (35, 35a) of the movable member.
8. Saving device according to Claim 5, characterized in that it comprises a sensor of drop in pressure delivering a pneumatic signal from the drop in pressure of the jack on the exhaust side.
9. Saving device according to Claim 5, characterized in that the pneumatic signal is issued by a circuit associated to the motion of another jack which is triggered off immediately after the end of stroke of the controlled jack (1).
10. Saving device according to Claim 1, characterized in that it comprises a means (23, 23a) for adjusting the opening position of the means (11, 11 a) so as to control the flow rate of the pressurized fluid and the speed of the movable member (4) of the jack.
11. Saving device according to Claim 1, characterized in that one valve seat (16, 16a) is mounted in a movable manner and it is adapted to selectively take a shutting position under the action of the pressure of the driving fluid and an opening position under the action of the pressure of the exhaust fluid.
12. Saving device according to any one of Claims 1 to 11, characterized in that it comprises a body (8) in which two valves (11,11 a) are mounted, each controlling an orifice for passage (15, 15a) between one of the chambers (10, 10a) of the jack (1) and a fluid distributor (2).
13. Saving device according to any one of Claims 3, 4 or 12, characterized in that the driving circuits (26, 26a) are integrated in the body (8).
14. Saving device according to Claim 12, characterized in that each valve (11, 11 a) comprises an obturating member (14, 14a) cooperating with a seat (16,16a) and integral with a piston (19, 19a) mounted for sliding in a cylinder of the body, said piston being subjected on its two faces to the action of an elastic member (22, 22a) and a pressurized fluid.
15. Saving device according to Claim 14, characterized in that the piston (19,19a) is subjected on its two faces to the action of pressurized fluids.
16. Saving device according to Claim 1, characterized in that a body (41 ) containing two valves (11, 11 a) is mounted between the distributor (42) and a base plate (43) with which it is in contact via two of its faces (44, 45), said base plate (43) having integrated canals (46, 48) and establishing the communication, on the one hand, with the conduits emerging onto one of the faces (45) of said body (41), and on the other hand, with the jack (1) and the fluid inlet and outlet conduits, said body (41 ) having on another face (44) conduit orifices situated opposite the orifices of the distributor conduits (42).
17. Device according to Claim 16, characterized in thatthe device comprises two valves (11, 11 a) controlling the passage of the driving fluid and two non-return valves (56, 56a) controlling the passage of the fluid towards the exhaust.
18. Device according to Claim 17, characterized in that the valves (11, 11 a) controlling the passage of the driving fluid are of the open type and comprise an obturating member (52, 52a) mounted for sliding in the body (41 ) and integral with a piston (51, 51 a) subjected on one of its faces to the joint action of a spring (54, 54a) and of the pressure of the exhaust fluid, and on the other face to the action of the pressure of the driving fluid, said spring (54, 54a) having a force just sufficient to keep the flap-valve (11, 11 a) open, when there is no pressure on the other face (62a) of the piston.
19. Device according to Claim 17, characterized in that the valves (11, 11 a) controlling the passage of the driving fluid are of the open type and comprise an obturating member (52, 52a) integral with a piston (51, 51 a) subjected on one of its faces to the action of a spring (54, 54a) for the opening position of the valve and on the other face for the closing position of the valve to the action of a pneumatic signal delivered by a position sensor of the movable member of the jack.
20. Device according to Claim 16, characterized in that the device comprises two flap-valves (67, 67a) of the open type controlling the passage of the driving fluid and the exhaust fluid, each of the flap-valves (67, 67a) being subjected to the action of a spring (79, 79a) and having a rod (71, 71 a) whose end is mounted for sliding in a dead hole of a piston (72, 72a) subjected on one of its faces of greater section to the joint action of a spring (74, 74a) and of the exhaust pressure and on the other face of smaller section to the action of the pressure of the driving fluid.
21. Device according to Claim 20, characterized in that each of the flap-valves (67, 67a) is subjected to the action of a spring and has a rod (71, 71 a) whose end is mounted for sliding into a dead hole of a piston (72, 72a) subjected on one side to the action of a spring (74, 74a) and on the other side to the action of a pneumatic signal delivered by a position sensor of the movable member of the jack and to the pressure of the motive fluid.
22. Device according to Claim 1, characterized in that it comprises a body (84, 84a) for double connection comprising two saving devices placed in parallel, each comprising at its two ends conduits (86, 86a) of fluid circulation provided with connecting means (87, 87a) with external conduits, said body having in its central part two borings (88) perpendicular to the conduits (86, 86a) and in which are respectively mounted a valve (89) controlling the passage of the motive fluid and a non-return flap-valve (95) controlling the passage of the fluid towards the exhaust.
23. Device according to Claim 22, characterized in that the connection body comprises two T-shaped elements (84, 84a) interconnected by a groove.
24. Device according to Claims 22 and 23, characterized in thatthe flap-valve (89) comprises an obturating member (90) integral with a piston (91 ) mounted for sliding in a cylinder provided on one side of the boring (88) and closed by a plug (92) against which rests one of the ends of a spring (93) whose other end acts in combination with the exhaust pressure against the piston (91 ) of the valve (89) the other end of the boring (88) being closed by a plug (94) carrying a deformable diaphragm (95) constituting a non-return valve and a screw (96) limiting the stroke of the valve and enabling to adjust the speed of the jack piston.
25. Device according to Claim 24, characterized in that on the side of the boring (88) constituting a cylinder, in which the piston of the valve moves (91) an obturating sleeve (97) is mounted, which sleeve comprising a member (98) for adjusting the tension of the spring (93) and provided with coloured rings (100) for the visualization of the saving.
26. Device according to Claims 22 and 23, characterized in that on one side of each boring (102) a plug (103) is mounted against which rests a spring (104) pushing back a flap-valve (105) controlling the passage of the driving fluid and the exhaust fluid, said flap-valve (105) being extended by a rod (106) mounted for sliding in a dead hole of a piston (107) sliding in the boring, said piston (109) being subjected on one of its faces to the action of a spring (108) resting against a plug (109) screwed in the central boring on the other side of the flap-valve and to the action of the exhaust fluid.
27. Device according to Claim 1, characterized in that it comprises a simple junction (110) comprising a valve (111 ) controlling the passage of the fluid and having an orifice (112) connected to chamber (10) of a jack (1) and another orifice (114) connected to a distributor (115) adapted to put said chamber (10) in communication with a source of driving fluid and the atmosphere.
28. Device according to Claim 27, characterized in that the junction (110) comprises a main body (117) having at its base a threaded part (130) for its fitting into a tapped hole of a supporting member, said main body (117) comprising a valve (111) controlling the passage of the fluid controlled by a piston (118) subjected to the action of a pneumatic signal, said body (117) receiving a socket (126) having a nozzle (127) communicating the chamber of the jack with the orifice for passage of the fluid into the body.
EP83400524A 1982-03-19 1983-03-15 Compressed air economising device Expired EP0089881B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8205042 1982-03-19
FR8205042A FR2523659A1 (en) 1982-03-19 1982-03-19 Control economiser for compressed air - has adjustable, double reduction valve controlling actuator operating cycle of actuator moving part
FR8303513A FR2542043B2 (en) 1983-03-03 1983-03-03 COMPRESSED AIR SAVING DEVICE
FR8303513 1983-03-03

Publications (3)

Publication Number Publication Date
EP0089881A2 EP0089881A2 (en) 1983-09-28
EP0089881A3 EP0089881A3 (en) 1984-01-18
EP0089881B1 true EP0089881B1 (en) 1985-09-25

Family

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EP83400524A Expired EP0089881B1 (en) 1982-03-19 1983-03-15 Compressed air economising device

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US (1) US4608910A (en)
EP (1) EP0089881B1 (en)
JP (1) JPS591801A (en)
CH (1) CH652454A5 (en)
DE (1) DE3360864D1 (en)
ES (1) ES520793A0 (en)
GB (1) GB2117055B (en)
IT (2) IT8353079V0 (en)

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Also Published As

Publication number Publication date
IT1158908B (en) 1987-02-25
IT8353079V0 (en) 1983-03-18
GB2117055A (en) 1983-10-05
GB2117055B (en) 1985-12-18
ES8402053A1 (en) 1984-01-01
ES520793A0 (en) 1984-01-01
EP0089881A3 (en) 1984-01-18
DE3360864D1 (en) 1985-10-31
US4608910A (en) 1986-09-02
CH652454A5 (en) 1985-11-15
JPS591801A (en) 1984-01-07
GB8307508D0 (en) 1983-04-27
IT8367309A0 (en) 1983-03-18
EP0089881A2 (en) 1983-09-28

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