EP0230529B1 - Configuration de valves pour accumulateur hydraulique - Google Patents

Configuration de valves pour accumulateur hydraulique Download PDF

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Publication number
EP0230529B1
EP0230529B1 EP86114822A EP86114822A EP0230529B1 EP 0230529 B1 EP0230529 B1 EP 0230529B1 EP 86114822 A EP86114822 A EP 86114822A EP 86114822 A EP86114822 A EP 86114822A EP 0230529 B1 EP0230529 B1 EP 0230529B1
Authority
EP
European Patent Office
Prior art keywords
valve
pressure
control
line
shut
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 - Lifetime
Application number
EP86114822A
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German (de)
English (en)
Other versions
EP0230529A2 (fr
EP0230529A3 (en
Inventor
Gerald Lexen
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.)
MAN Truck and Bus SE
Original Assignee
MAN Nutzfahrzeuge AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MAN Nutzfahrzeuge AG filed Critical MAN Nutzfahrzeuge AG
Priority to AT86114822T priority Critical patent/ATE72693T1/de
Publication of EP0230529A2 publication Critical patent/EP0230529A2/fr
Publication of EP0230529A3 publication Critical patent/EP0230529A3/de
Application granted granted Critical
Publication of EP0230529B1 publication Critical patent/EP0230529B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B2013/0428—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with switchable internal or external pilot pressure source
    • 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 valve arrangement for shutting off or releasing the connection between a hydrostatic machine that can be operated as a motor or pump and a pressure accumulator that can be hydraulically charged or discharged by the latter, with features of the type specified in the preamble of claim 1.
  • the invention is based on a prior art according to the technical publication "Hydrobus", final technical report - hydrostatic braking energy recovery for city buses - April 1983. There is a memory shut-off block shown and briefly described on pages 41 and 286, on which the features mentioned in the introduction can be read are.
  • This known storage shut-off block summarizes the shut-off for both a high-pressure and a low-pressure store. Although this allows a relatively compact design, there are certain disadvantages. Since each memory has a certain spatial extent, the known memory shut-off block cannot be attached directly to the respective memory, but must be connected to it via appropriate pressure lines. This poses a certain safety risk, because such a pressure line could leak, for example, due to vibrations occurring during operation. It should also be borne in mind that in a high-pressure accumulator, when it is completely filled, there can generally be a pressure of over 400 bar. If this high pressure accumulator pressurized in this way were suddenly relieved, this could lead to damage in the control valve, in the line paths and also in the shut-off valve.
  • this oil drainage which is accompanied by a pressure relief, is carried out via separate devices in collection containers which are to be provided for this purpose.
  • each pressure accumulator is assigned its own valve arrangement of the type claimed.
  • a hydraulic control circuit is controlled in principle by means of a leak-free control valve, for the control of which only relatively small forces are required, which supplies the actuating forces required to actuate the shut-off valve.
  • the shut-off valve is formed by a 2/2-way valve in cartridge design. This forms a ready-to-install unit and can be replaced with another, similar valve if necessary with little effort, e.g. if Safety regulations should prescribe the regular replacement of the shut-off valve.
  • This shut-off valve has a control cylinder in which an actuating piston is slidably received.
  • This actuating piston carries a valve body that can be hermetically sealed against a valve seat and always seals leak-free even against extremely high pressure drops, provided that a sufficiently high control pressure acts on the actuating piston, because the pressure tendencies prevailing on both sides of the valve seat tend to close the actuating piston in this way move so that the valve body lifts off the valve seat.
  • the two outputs of the shut-off valve on each side of the valve seat are each connected to a shuttle valve, the third connection of which is connected to the control cylinder of the shut-off valve.
  • the pressure drop driving the shuttle valve corresponds to the pressure drop across the shut-off valve, the higher pressure applied to it being applied by the shuttle valve to the control cylinder becomes.
  • a pressure which is sufficient to press the valve body sufficiently firmly against the valve seat therefore always acts on the actuating piston.
  • the actuating piston is sealingly guided in the control cylinder. That connection of the shut-off valve, which is only separated from the inside of the control cylinder by the actuating piston, is connected to the pressure accumulator. As long as the shut-off valve is closed, in particular during those times in which the device equipped with the valve arrangement according to the invention is not used, there is no pressure drop across the actuating piston, so that the shut-off valve can shut off leak-tight for any length of time.
  • a leak-free, remotely operable control valve is arranged between its control cylinder and the shuttle valve, which in its rest position establishes the connection between the shuttle valve and the control cylinder, but in the working position shuts off the shuttle valve and relieves the control cylinder of a tank or reservoir .
  • the pressures are the same as in the shut-off valve, but the throughput of hydraulic fluid to be controlled is only low, since this is only used to actuate the shut-off valve. It is therefore possible to provide such a valve with an actuator which can be controlled by a control signal and which operates the valve reliably in a sufficiently short time.
  • the control valve Since the valve has a defined rest position, in which it connects the control cylinder of the shut-off valve with the shuttle valve, precaution is taken in the event of a control failure that the pressure accumulator is shut off.
  • the control valve is designed as a directional seat valve with an electromagnetic actuating device. It has a valve seat which hermetically seals its connection to the tank in the rest position of the control valve, so that the control pressure transmitted by the control valve in this operating state cannot escape to the tank.
  • the control valve is also designed so that any pressure forces that occur are directed perpendicular to the movement of its valve body, so that only relatively small actuating forces are required. Because of the small required channel cross section, the valve body of the control valve only has to cover a relatively short switching distance, so that an electromagnet as an actuator for the control valve is completely sufficient.
  • shut-off valve, the shuttle valve, the hydraulic parts of the control valve and the respective connecting lines are combined in a common block.
  • this is a pressure relief valve that connects the pressure accumulator to the tank and has the purpose of automatically reducing this excess pressure to a permissible value in the event of an unacceptable excess pressure in the pressure accumulator.
  • Such an impermissible excess pressure can be brought about, for example, by mechanical deformation of the pressure accumulator or its heating. It is thus possible to mount the pressure accumulator together with the valve arrangement according to the invention in a vehicle even at locations where it is exposed to the sun's rays or other heating. Furthermore, the latter configuration ensures that the pressure accumulator does not burst in the event of an accident.
  • a throttle is arranged in the feed line between the control valve and the control cylinder of the shut-off valve, and a throttle is arranged in the relief line leading from the control valve to the tank.
  • a blockage throttle is provided in the block between the line connected to the tank and the line connected to the pressure accumulator.
  • This shut-off throttle can optionally be provided with a servomotor.
  • This shut-off throttle is used to safely relieve the pressure in the reservoir towards the tank, which is necessary, for example, when repair or maintenance work on the pressure reservoir or on the valve arrangement has to be carried out. It is also possible to connect a servomotor assigned to the shut-off throttle to a monitoring device which is connected to two pressure measuring points, so that the pressure accumulator is automatically emptied when a fault occurs.
  • Said pressure measuring points are provided according to a preferred embodiment of the invention, namely on both sides of the shut-off valve, preferably in the respective control line to the shuttle valve.
  • Each pressure measuring point is equipped with a pressure sensor. Via these two pressure measuring points, every pressure relevant for operation and operational safety can be taken off, e.g. the supply pressure in the accumulator, the delivery pressure of the hydrostatic machine working as a pump and the like. More. When the shut-off valve is closed, the pressure drop measured must remain constant. If this is not the case, then there is a fault.
  • the two pressure measuring points can also be equipped with a device which takes remedial measures and / or triggers an alarm in the event of such a fault.
  • the invention thus creates a valve arrangement in the form of a compact block with safety functions for hydraulic accumulators with a blocking position, a continuous position and the possibility of emptying the accumulator directly into the oil tank via a shut-off throttle.
  • the control pressure for controlling the actual shut-off valve which is preferably designed as a 2/2-way valve in cartridge design, is taken directly from the connections for the accumulator or the connected hydraulic unit, the higher of the two pressures being selected in order to achieve a reliable holding effect. Furthermore, measuring connections for regulation, control or monitoring are provided.
  • the block-internal work and control lines are realized through bores, so that there is no risk of damage to the connecting lines there.
  • the block can advantageously be flanged directly to the pressure accumulator; however, it is equally possible to attach this block wherever this is particularly advantageous for spatial reasons.
  • the block does not have to be easily accessible from the outside.
  • Both the 2/2-way valve in the cartridge design and the directional seat valve controlling this are each absolutely sealed when closed, so that any pressure drop due to leakage is reliably avoided over a long period of time.
  • the chokes arranged in the control lines also serve to coordinate the switching time.
  • the shut-off block according to the invention is thus very compact and simple, can be attached to the pressure vessel as well as anywhere in a vehicle, and the control valve can be operated remotely, so that the shut-off block according to the invention is suitable for the electro-hydraulic control of the storage hydraulics.
  • the simple structure also guarantees safe operation.
  • shut-off block forming the valve arrangement according to the invention is shown schematically.
  • the shut-off block 5 shown has three hydraulic connections, namely a connection P for a hydrostatic machine which can be operated either as a pump or motor, a connection S for a high-pressure or low-pressure accumulator and a connection T for a tank or reservoir.
  • a 2/2-way valve C in a cartridge design is arranged inside the shut-off block 5 and has a control cylinder 6.
  • an actuating piston 9 is arranged in a sealing and movable manner and carries a valve body 10 on its side facing away from the pressure chamber of the control cylinder 6.
  • This valve body 10 is set up to seal against leakage in the end position shown in the drawing relative to a valve seat 11.
  • the valve seat 11 divides the interior of the valve C into a first space 7 with a connection B adjacent to the actuating piston 9 and a second space 8 with a connection A.
  • the connection B is connected via a working line 3 to the storage connection S during the connection A is connected via a working line 4 to the connection P for the hydrostatic machine.
  • a spring is preferably provided in the valve C, which presses the actuating piston 9 and thus the valve body 10 against the valve seat 11.
  • the working line 4 is connected via a control line 1 to one input of a shuttle valve WV, the other input via a control line 2 is connected to the working line 3.
  • the two control lines 1 and 2 and thus also the respective working line 4 and 3 are each formed with a measuring connection M 'or M''on which a pressure sensor is arranged.
  • the output of the shuttle valve WV is connected to the control cylinder 6 of the shut-off valve C via a further control line 15.
  • the shuttle valve WV has a valve body, which blocks each of the two inputs of the shuttle valve WV, at which the lower pressure is applied, so that the control cylinder 6 of the shut-off valve C can always be connected to that working line 3 or 4, in each of which the higher pressure prevails. It is therefore always ensured that when the control cylinder 6 is pressurized, it is so high that the valve body 10 of the shut-off valve C remains pressed against the valve seat 11 in a sealing manner.
  • a control valve Wang is formed as a directional seat valve, the rest position of which is shown in the drawing and which is moved out of this rest position against the force of a spring 13 when an electromagnet 12 is actuated.
  • control valve W connects the two branches of the control line 15, between which the control valve W is arranged.
  • a discharge line 14 which connects the control valve W with the connection T for the storage container, is blocked free of leakage by an absolutely tight valve seat seal.
  • control valve W If the control valve W is now moved into its working position against the action of the spring 13 by actuating the electromagnet 12, then that branch of the control line 15 which leads to the shut-off valve C is connected to the relief line 14, while the other branch of the control line 15 is hermetically sealed becomes.
  • control cylinder 6 of the shut-off valve C is emptied via the port T and is therefore pressure-free, so that only the pressure prevailing in the interior spaces 7 and 8 of the shut-off valve C acts on the actuating piston 9, displaces this adjusting piston 9 in the drawing upward and thus lifts the valve body 10 from the valve seat 11, whereby the interiors 7 and 8 and thus the connections B and A of the shut-off valve C are connected to one another and can flow freely between the connections S and P via the working lines 3 and 4 hydraulic working fluid.
  • a first throttle DR ' is provided in the control line 15 between the shut-off valve C and the control valve W.
  • a second throttle DR '' is provided in the relief line 14 between the control valve W and the tank connection T.
  • shut-off block also has a pressure relief valve DB, which connects the working line 3 to the relief line 14 and thus the connections S and T to one another.
  • This pressure relief valve DB relieves any pressure increases caused by external influences (e.g. temperature, deformation, etc.), which can occur particularly in the event of an accident.
  • a shut-off throttle D is arranged, through the opening of which the working line 3 can also be connected to the relief line 14 and thus the connection S for the pressure accumulator to the connection T for the tank. It is thus possible to lower the pressure accumulator by opening the shut-off throttle D and to make it pressure-free. This is necessary, for example, if repairs or a change in the hydraulic oil have to be carried out.
  • the shut-off throttle D can be operated remotely and can be coupled to a monitoring device or a sensor.
  • a monitoring device or a sensor For example, it is possible to couple the shut-off throttle D with a cover that closes the arrangement in such a way that the pressure accumulator is emptied when the cover is removed. It is also possible to provide the shut-off throttle D with an easily accessible handle, via which e.g. the pressure accumulator can be released after an accident.

Claims (2)

  1. Dispositif de distributeurs pour fermer ou libérer une liaison entre une machine hydrostatique fonctionnant en moteur ou en pompe et un accumulateur de pression qui se charge ou se vide de manière hydraulique, comprenant :
    a) une réalisation en caisson, sans fuite d'un distributeur à 2/2 voies sous la forme d'une soupape d'arrêt (C) avec un branchement (B) pour l'accumulateur de pression (S) et un branchement (A) pour la machine hydrostatique (P), comportant en outre un vérin de commande (6), mobile de manière étanche, avec un piston de réglage (9) susceptible d'être chargé ou déchargé de la pression de commande, piston qui s'applique sans fuite, de manière étanche contre un siège de soupape (11) lors de l'application d'une pression, soupape qui porte un corps de soupape (10) libérant ou interrompant la liaison entre les deux branchements (A) et (B),
    b) un distributeur à tiroir (WV) qui est raccordé par chaque fois une conduite de commande (1, 2) à l'un des deux branchements (A, B) de la soupape d'arrêt (C) ainsi que par une conduite d'alimentation (15) au vérin de commande (6) de la soupape d'arrêt (C) de façon que cette conduite d'alimentation (15) soit respectivement reliée à celui des branchements (A, B) dans lequel règne la pression la plus élevée et
    c) une soupape d'arrêt (C) prévu dans la conduite d'alimentation (15) reliant le distributeur à tiroir (WV) au cylindre de commande (6), comme soupape à commande électromagnétique, télécommandée, formant une soupape de commande sans fuite (W) qui dans une position, coupe la conduite (15) entre le distributeur à tiroir (WV) et le vérin de commande (6) et décharge celui-ci pour rendre passant la soupape d'arrêt (C) par une conduite de décharge (14) vers un branchement de réservoir (C) et qui dans son autre position laisse passer la pression de commande de la conduite d'alimentation (15) vers le cylindre de commande (6) pour fermer la soupape d'arrêt (C),
    la soupape d'arrêt (C), le distributeur à tiroir (WV), les parties hydrauliques de la soupape de commande (W), le cas échéant d'autres organes ainsi que les conduites de liaison respectives étant réunis dans un bloc commun (5), dispositif caractérisé en ce que le bloc commun (5) comporte d'autres organes,
    - une soupape limiteur de pression (DB) qui s'ouvre lorsqu'on atteint une haute pression autorisée, cette soupape étant montée entre la conduite de décharge (14) allant au branchement de réservoir (T) et la conduite (3) reliée à l'accumulateur de pression (S) et qui est raccordé au branchement de l'accumulateur de pression (S) et au branchement (B) de la soupape d'arrêt (C),
    - un organe d'étranglement (DR') dans la conduite d'alimentation (15) entre la soupape de commande (W) et le vérin de commande (6) de la soupape d'arrêt (C),
    - un organe d'étranglement (DR") dans la conduite de décharge (14) allant de la soupape de commande (W) au branchement de réservoir (T), et
    - une soupape d'arrêt (D) entre la conduite de décharge (14) et la conduite (3), organe d'étranglement (D) par lequel l'accumulateur de pression (S) peut être vidé le cas échéant dans le réservoir.
  2. Dispositif de distributeurs selon la revendication 1, caractérisé en ce qu'aux deux branchements (A, B) de la soupape d'arrêt (C) et le cas échéant aux conduites (2, 3) ou (1, 4) reliées aux branchements (A, B), on a chaque fois un point de mesure de pression pour un capteur de signal de pression
EP86114822A 1986-01-27 1986-10-24 Configuration de valves pour accumulateur hydraulique Expired - Lifetime EP0230529B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114822T ATE72693T1 (de) 1986-01-27 1986-10-24 Ventilanordnung fuer einen hydraulischen druckspeicher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3602362 1986-01-27
DE19863602362 DE3602362A1 (de) 1986-01-27 1986-01-27 Ventilanordnung fuer einen hydraulischen druckspeicher

Publications (3)

Publication Number Publication Date
EP0230529A2 EP0230529A2 (fr) 1987-08-05
EP0230529A3 EP0230529A3 (en) 1989-04-26
EP0230529B1 true EP0230529B1 (fr) 1992-02-19

Family

ID=6292702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114822A Expired - Lifetime EP0230529B1 (fr) 1986-01-27 1986-10-24 Configuration de valves pour accumulateur hydraulique

Country Status (5)

Country Link
US (1) US4706930A (fr)
EP (1) EP0230529B1 (fr)
AT (1) ATE72693T1 (fr)
DE (2) DE3602362A1 (fr)
DK (1) DK166551B1 (fr)

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Also Published As

Publication number Publication date
DK578386A (da) 1987-07-28
DK578386D0 (da) 1986-12-02
EP0230529A2 (fr) 1987-08-05
DK166551B1 (da) 1993-06-07
ATE72693T1 (de) 1992-03-15
EP0230529A3 (en) 1989-04-26
DE3602362A1 (de) 1987-07-30
US4706930A (en) 1987-11-17
DE3683933D1 (de) 1992-03-26

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