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EP0049824B1 - Pressure vessel, in particular accumulator for a fluid system - Google Patents

Pressure vessel, in particular accumulator for a fluid system Download PDF

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Publication number
EP0049824B1
EP0049824B1 EP81107800A EP81107800A EP0049824B1 EP 0049824 B1 EP0049824 B1 EP 0049824B1 EP 81107800 A EP81107800 A EP 81107800A EP 81107800 A EP81107800 A EP 81107800A EP 0049824 B1 EP0049824 B1 EP 0049824B1
Authority
EP
European Patent Office
Prior art keywords
bladder
housing
annular groove
annular
end cap
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
EP81107800A
Other languages
German (de)
French (fr)
Other versions
EP0049824A1 (en
Inventor
Ivan Leroy Petrie
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Priority to AT81107800T priority Critical patent/ATE8523T1/en
Publication of EP0049824A1 publication Critical patent/EP0049824A1/en
Application granted granted Critical
Publication of EP0049824B1 publication Critical patent/EP0049824B1/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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/12—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery
    • F15B1/125—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery characterised by the attachment 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
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/43—Anti-extrusion means
    • F15B2201/435—Anti-extrusion means being fixed to the separating means

Definitions

  • holes can be guided through the wall of the closure element in the region of the first annular groove, which establish a connection between the gas space and the annular groove, so that the annular bead of the bladder entering the annular groove is acted upon by the gas pressure and thus to improve a seal against the inner wall of the Housing is pressed.
  • a hydropneumatic pressure accumulator can be found in US Pat. No. 3,907,000, the closure element of which is completely inserted into the housing and is welded to the inner wall thereof.
  • the closure element is stepped on its circumference and is encompassed by the free edge of the bladder, which, however, does not lie axially against the annular shoulder of the closure element.
  • the bladder does not have a smooth outer surface and lies only in the area of the closure element with two axially successive annular beads on the inner wall of the housing.
  • An O-ring is arranged as a seal between the bladder and a second ring shoulder of the closure element.
  • the closure element engages with a lower, radially directed bead edge in a corresponding annular groove of the bladder.
  • the invention has for its object to improve the embodiment described above with regard to the sealing of the bladder from the outside atmosphere and / or from the outer chamber receiving the hydraulic oil while reducing the manufacturing costs.
  • annular bead of the bladder engages in the first annular groove of the closure element, while a seal is inserted in the second annular groove of the closure element, which seals the bladder with respect to the closure element.
  • the combination of ring bead and seal is designed so that the ring bead is pressed into the first ring groove when the closure element is fully pressed into the housing. This pressure results in a tight seal between the outer surface of the bladder and the inner wall of the housing.
  • the seal in the second annular groove ensures a seal between the closure element and the bladder, so that the gas contained in the bladder cannot mix with the oil which is located in the outer chamber formed by the bladder and the housing. Because of the large distance between the seal, which is preferably an O-ring, from the weld seam between the closure element and the housing, it is ensured that no damage to the seal can occur during welding.
  • the bladder is made in a manner known per se from elastically resilient material, so that it is ensured in connection with its attachment and its shape that the bladder is uniform when filled with compressed gas expand outwards and lie against the inner wall of the housing.
  • an exemplary embodiment of the invention is shown in longitudinal section.
  • the pressure vessel 10 shown also called pressure accumulator, consists of a cylindrical housing 12 made of rigid material with a closed end 14 and an open end 16.
  • the closed end 14 is provided with a connection 18, through which liquid into the housing, or else can flow out of the housing.
  • the open end 16 of the housing is closed by a plug-like closure element 20, which is inserted into the housing end and has a continuous axial bore 22 in which a compressed gas valve 24 is fixed, which is usually closed, but can be flowed through in one direction or the other if necessary.
  • a compressed gas valve 24 is fixed on the closure element 20 via a nut 26 and sealed from the atmosphere by a protective cap 28.
  • the entire compressed gas valve 24 lies completely within the outer contours of the closure element 20.
  • the closure element 20 has on its outer circumference an annular shoulder 30 which, when the closure element is firmly pressed into the open end 16 of the housing 12, lies axially against the edge of the open housing end 16 and here via an endless weld seam 31 with the Housing end is connected.
  • annular shoulder 30 On the portion of the closure element protruding into the housing, two annular grooves 32, 34 are provided in the outer circumference.
  • the first annular groove 32 serves to connect the closure element 20 to an essentially cylindrical bladder 36, while the second annular groove 34 serves to receive a seal 46, preferably an O-ring.
  • the bladder 36 is made of resilient material such as. B. rubber and has a closed end 38 and an open end 40.
  • an expansion limiting element 42 is provided which is intended to prevent the bladder from being pushed through the connection 18 if the bladder is stretched too much and is thereby damaged when the internal pressure in the bladder 36 becomes greater than the pressure in the connection 18
  • Edge region 44 of the open end 40 of the bladder 36 is designed as an inwardly projecting annular bead which is adapted in its cross-sectional contour to that of the first annular groove 32 of the closure element 20 and is pressed into this second annular groove to connect the two parts to one another.
  • the annular bead 44 is preferably located at the extreme end of the bladder 36.
  • the O-ring 46 in the second annular groove 34 serves to seal between the outer periphery of the closure element 20 and the inner surface of the bladder 36.
  • the combination of annular bead 44 and seal 46 is designed so that when the closure element 20 is completely in the housing 12 is pressed in until the annular shoulder 30 lies axially against the edge of the open housing end 16, the annular bead 44 is pressed into the first annular groove 32.
  • This pressure leads to a tight seal between the outer surface of the bladder 36 and the inner wall of the housing 12.
  • this sealing system cannot be thermally damaged if the closure element 20 is connected to the housing 12 by the endless weld seam 31.
  • the bladder 36 tapers slightly conically starting from a point 48 in the vicinity of the inner end 50 of the closure element 20 or the aforementioned seal 46 towards its closed end 38. This slight taper, on the order of half a degree or slightly more, ensures a uniform expansion of the bladder 36 and a correspondingly even abutment of this bladder against the inner wall of the housing 12 when pressurized gas is introduced into the bladder.
  • the pressure vessel 10 is usually connected via its connection 18 to a hydraulic system via a hydraulic line, e.g. B. a seat suspension system.
  • a gas line is then connected to the pressure gas valve 24 to fill the inner chamber formed by the bladder 36 with gas up to a gas pressure of approximately 6.24 bar (90 psi).
  • Seat suspension systems that operate with hydraulic fluid are designed for higher pressures, which range from 6.93 to 8.16 bar (100 to 120 psi).
  • the various functions of the suspension system then cause hydraulic fluid to pass through the connection 18 into the outer chamber of the housing 10. Since the hydraulic fluid has a higher pressure than inside the bladder 36, the bladder 36 is compressed, which increases the original gas pressure in the bladder. The system stabilizes when there is pressure equalization between the outer and inner chamber of the pressure vessel.
  • the hydraulic fluid leaves the pressure vessel 10 either by increasing the gas pressure within the bladder 36 or by reducing the hydraulic pressure within the suspension system. As the hydraulic fluid drains, the bladder 36 expands back to its original shape so that the operation can be repeated.
  • the housing 12 When assembling the pressure vessel 10, the housing 12 must first be carefully cleaned of all contaminants such as oil, dirt and other particles. Then a seal 46, preferably an O-ring, is inserted into the second annular groove 34 of the closure element 20 inserted. Then the open end 40 of the bladder 36 is pushed over the inner end of the closure element 20 until the annular bead 44 engages in the first annular groove 32. The closure element 20 is then inserted together with the bladder 36 attached to it into the housing 12 and then pressed in under pressure until the annular shoulder 20 of the closure element lies axially against the edge of the open housing end 16. The closure element 20 is then welded to the housing 12 using an endless welding bead 31 or a similar method. The compressed gas valve 24 is then screwed into the axial bore 22 of the closure element 20 and fixed via the nut 26. The pressure vessel 10 is then ready for installation.
  • a seal 46 preferably an O-ring

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Description

Die Erfindung betrifft ein Druckgefäß, insbesondere Druckakkumulator für Druckmittelkreise, bestehend aus:

  • - einem zylindrischen Gehäuse mit einem offenen Ende und einem mit einem Anschluß versehenen geschlossenen Ende;
  • - einem stöpselartigen Verschlußelement, das in das offene Ende des Gehäuses eingesteckt und mit letzteren verbunden ist, eine durchgehende Axialbohrung aufweist und an seinem Außenumfang mit einer äußeren Ringschulter, einer dieser axial nachgeordneten ersten Ringnut und einer dieser axial nachgeordneten zweiten Ringnut versehen ist; dabei liegt die Ringschulter des Verschlußelements axial gegen den Rand des offenen Gehäuseendes an und ist mit diesem verschweißt, wobei die Schweißnaht das offene Ende des Gehäuses vollständig abschließt;
  • - einem in der genannten Axialbohrung angeordneten Druckgasventil;
  • - einer durch das Verschlußelement vollständig im Gehäuse gehaltenen Blase mit einem geschlossenen Ende und einem offenen Ende, dessen Randbereich als nach innen vorstehender Ringwulst ausgebildet ist, der in eine Ringnut des Verschlußelementes eingreift und so eine Abdichtung zwischen der Innenwandung des Gehäuses und der Blase bildet, wobei die Blase eine glatte äußere Mantelfläche aufweist, die bis zu einem Punkt in der Nähe des inneren Endes des Verschlußelementes zylindrisch ausgebildet ist, um sich ausgehend von diesem Punkt zu dem geschlossenen Ende hin leicht konisch zu verjüngen.
The invention relates to a pressure vessel, in particular a pressure accumulator for pressure medium circuits, consisting of:
  • - A cylindrical housing with an open end and a closed end provided with a connection;
  • - A plug-like closure element which is inserted into the open end of the housing and connected to the latter, has a continuous axial bore and is provided on its outer circumference with an outer annular shoulder, one axially downstream first annular groove and one axially downstream second annular groove; the ring shoulder of the closure element lies axially against the edge of the open housing end and is welded to it, the weld seam completely closing off the open end of the housing;
  • - A pressure gas valve arranged in said axial bore;
  • a bladder held completely in the housing by the closure element with a closed end and an open end, the edge region of which is designed as an inwardly projecting annular bead which engages in an annular groove of the closure element and thus forms a seal between the inner wall of the housing and the bladder, wherein the bladder has a smooth outer surface which is cylindrical to a point near the inner end of the closure element to taper slightly from this point towards the closed end.

Eine derartige Ausführungsform läßt sich der US-A-3 674 054 (siehe dort insbesondere Figur 2) entnehmen. Die der Ringschulter des stöpselartigen Verschlußelementes axial nachgeordnete erste Ringnut übergreift die Schweißnaht zwischen der genannten Ringschulter und dem Rand des offenen Gehäuseendes, während der Ringwulst der Blase in die zweite Ringnut eingreift. Das stöpselartige Verschlußelement drückt mit einem radial gerichteten V↓uIstrand zwischen dem genannten Ringwulst und einer diesem nachgeordneten zweiten Ringwulst gegen die Blasenwandung und soll so eine die Abdichtung gewährleistende Spannung erzeugen. Außerdem können durch die Wandung des Verschlußelementes Bohrungen in den Bereich der ersten Ringnut geführt sein, die eine Verbindung zwischen dem Gasraum und der Ringnut herstellen, damit der in die Ringnut eingrenende Ringwulst der Blase vom Gasdruck beaufschlagt und so zur Verbesserung einer Abdichtung gegen die Innenwandung des Gehäuses gedrückt wird.Such an embodiment can be found in US Pat. No. 3,674,054 (see in particular FIG. 2 there). The first annular groove axially downstream of the annular shoulder of the plug-like closure element engages over the weld seam between said annular shoulder and the edge of the open housing end, while the annular bead of the bladder engages in the second annular groove. The plug-like closure element presses against the bladder wall with a radially directed V ↓ uIstrand between said ring bead and a second ring bead arranged after it, and is said to generate a tension ensuring the sealing. In addition, holes can be guided through the wall of the closure element in the region of the first annular groove, which establish a connection between the gas space and the annular groove, so that the annular bead of the bladder entering the annular groove is acted upon by the gas pressure and thus to improve a seal against the inner wall of the Housing is pressed.

Der US-A-3 907 000 läßt sich ein hydropneumatischer Druckspeicher entnehmen, dessen Verschlußelement vollständig in das Gehäuse eingeschoben und mit dessen Innenwandung verschweißt ist. Das Verschlußelement ist an seinem Umfang abgestuft und wird vom freien Rand der Blase umgriffen, die jedoch axial nicht gegen die Ringschulter des Verschlußelementes anliegt. Die Blase weist keine glatte äußere Mantelfläche auf und liegt lediglich im Bereich des Verschlußelementes mit zwei axial einander nachgeordneten Ringwulsten an der Innenwandung des Gehäuses an. Zwischen der Blase und einer zweiten Ringschulter des Verschlußelementes ist als Dichtung ein O-Ring angeordnet. Außerdem greift das Verschlußelement mit einem unteren, radial gerichteten Wulstrand in eine entsprechende ringförmige Rinne der Blase ein. Bei der Montage des Verschlußelementes erfolgt keine Kompression des Blasenrandes; eine Abdichtung erfolgt erst bei Gasfüllung aufgrund des dann einwirkenden Innendruckes.A hydropneumatic pressure accumulator can be found in US Pat. No. 3,907,000, the closure element of which is completely inserted into the housing and is welded to the inner wall thereof. The closure element is stepped on its circumference and is encompassed by the free edge of the bladder, which, however, does not lie axially against the annular shoulder of the closure element. The bladder does not have a smooth outer surface and lies only in the area of the closure element with two axially successive annular beads on the inner wall of the housing. An O-ring is arranged as a seal between the bladder and a second ring shoulder of the closure element. In addition, the closure element engages with a lower, radially directed bead edge in a corresponding annular groove of the bladder. When the closure element is assembled, the bladder edge is not compressed; sealing only takes place when the gas is filled due to the internal pressure then acting.

Der Erfindung liegt die Aufgabe zugrunde, die eingangs erläuterte Ausführungsform hinsichtlich der Abdichtung der Blase gegenüber der Außenatmosphäre und/oder gegenüber der das Hydrauliköl aufnehmenden äußeren Kammer bei gleichzeitiger Verringerung der Herstellungskosten zu verbessern.The invention has for its object to improve the embodiment described above with regard to the sealing of the bladder from the outside atmosphere and / or from the outer chamber receiving the hydraulic oil while reducing the manufacturing costs.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß der Ringwulst der Blase in die erste Ringnut des Verschlußelementes eingreift, während in die zweite Ringnut des Verschlußelementes eine Dichtung eingelegt ist, die die Blase gegenüber dem Verschlußelement abdichtet.This object is achieved according to the invention in that the annular bead of the bladder engages in the first annular groove of the closure element, while a seal is inserted in the second annular groove of the closure element, which seals the bladder with respect to the closure element.

Die Kombination von Ringwulst und Dichtung ist dabei so ausgelegt, daß bei vollständig in das Gehäuse eingedrücktem Verschlußelement der Ringwulst in die erste Ringnut gepreßt wird. Diese Pressung führt zu einer festen Abdichtung zwischen der äußeren Oberfläche der Blase und der Innenwandung des Gehäuses. Demgegenüber wird durch die Dichtung in der zweiten Ringnut eine Abdichtung zwischen Verschlußelement und Blase sichergestellt, so daß sich das in der Blase enthaltene Gas nicht mit dem Öl vermischen kann, das sich in der von der Blase und dem Gehäuse gebildeten äußeren Kammer befindet. Wegen des großen Abstandes der Dichtung, die vorzugsweise ein O-Ring ist, von der Schweißnaht zwischen Verschlußelement und Gehäuse ist sichergestellt, daß beim Verschweißen keine Beschädigung der Dichtung auftreten kann.The combination of ring bead and seal is designed so that the ring bead is pressed into the first ring groove when the closure element is fully pressed into the housing. This pressure results in a tight seal between the outer surface of the bladder and the inner wall of the housing. In contrast, the seal in the second annular groove ensures a seal between the closure element and the bladder, so that the gas contained in the bladder cannot mix with the oil which is located in the outer chamber formed by the bladder and the housing. Because of the large distance between the seal, which is preferably an O-ring, from the weld seam between the closure element and the housing, it is ensured that no damage to the seal can occur during welding.

Zur Erzielung einer ausreichenden Abdichtung ist es nicht erforderlich, Druckgas in die erste Ringnut zu leiten. Entsprechende Bohrungen können somit entfallen; das Verschlußelement läßt sich entsprechend einfacher gestalten und preiswerter herstellen.To achieve a sufficient seal, it is not necessary to pass compressed gas into the first annular groove. Corresponding holes can thus be omitted; the closure element can be made correspondingly simpler and cheaper to produce.

Die Blase besteht in an sich bekannter Weise aus elastisch nachgiebigem Material, so daß in Verbindung mit ihrer Befestigung und ihrer Formgebung sichergestellt wird, daß sich die Blase beim Füllen mit Druckgas gleichförmig nach außen ausdehnen und sich dabei gegen die Innenwandung des Gehäuses anlegen kann. In der Zeichnung ist eine als Beispiel dienende Ausführungsform der Erfindung im Längsschnitt dargestellt.The bladder is made in a manner known per se from elastically resilient material, so that it is ensured in connection with its attachment and its shape that the bladder is uniform when filled with compressed gas expand outwards and lie against the inner wall of the housing. In the drawing, an exemplary embodiment of the invention is shown in longitudinal section.

Das dargestellte Druckgefäß 10, auch Druckakkumulator genannt, besteht aus einem zylindrischen Gehäuse 12 aus starrem Material mit einem geschlossenen Ende 14 und einem offenen Ende 16. Das geschlossene Ende 14 ist mit einem Anschluß 18 versehen, durch den Flüssigkeit in das Gehäuse hinein, oder aber aus dem Gehäuse herausströmen kann. Das offene Ende 16 des Gehäuses ist durch ein stöpselartiges Verschlußelement 20 verschlossen, das in das Gehäuseende eingesteckt ist und eine durchgehende Axialbohrung 22 aufweist, in der ein Druckgasventil 24 festgelegt ist, das üblicherweise geschlossen, bedarfsweise aber in der einen oder anderen Richtung durchströmbar ist. Dadurch kann unter Druck stehendes Gas in das Gehäuse 12 gedrückt, oder aber aus diesem Gehäuse wieder herausgelassen werden. Das Druckgasventil 24 ist über eine Mutter 26 am Verschlußelement 20 festgelegt und über eine Schutzkappe 28 gegenüber der Atmosphäre abgedichtet. Das ganze Druckgasventil 24 liegt vollständig innerhalb der Außenkonturen des Verschlußelementes 20.The pressure vessel 10 shown, also called pressure accumulator, consists of a cylindrical housing 12 made of rigid material with a closed end 14 and an open end 16. The closed end 14 is provided with a connection 18, through which liquid into the housing, or else can flow out of the housing. The open end 16 of the housing is closed by a plug-like closure element 20, which is inserted into the housing end and has a continuous axial bore 22 in which a compressed gas valve 24 is fixed, which is usually closed, but can be flowed through in one direction or the other if necessary. As a result, gas under pressure can be pressed into the housing 12 or can be let out of this housing again. The compressed gas valve 24 is fixed on the closure element 20 via a nut 26 and sealed from the atmosphere by a protective cap 28. The entire compressed gas valve 24 lies completely within the outer contours of the closure element 20.

Das Verschlußelement 20 weist an seinem Au- ßenumfang eine Ringschulter 30 auf, die dann, wenn das Verschlußelement in das offene Ende 16 des Gehäuses 12 fest eingedrückt ist, axial gegen den Rand des offenen Gehäuseendes 16 anliegt und hier über eine endlose Schweißnaht 31 mit dem Gehäuseende verbunden wird. An dem in das Gehäuse hineinragenden Abschnitt des Verschlußelementes sind im Außenumfang zwei Ringnuten 32, 34 vorgesehen. Die erste Ringnut 32 dient zur Verbindung des Verschlußelementes 20 mit einer im wesentlichen zylindrisch ausgebildeten Blase 36, während die zweite Ringnut 34 zur Aufnahme einer Dichtung 46, vorzugsweise eines O-Ringes dient. Die Blase 36 besteht aus elastisch nachgiebigem Material wie z. B. Gummi und weist ein geschlossenes Ende 38 sowie ein offenes Ende 40 auf. In dem geschlossenen Ende 38 ist ein Ausdehnungsbegrenzungselement 42 vorgesehen, das verhindern soll, daß bei zu großer Streckung der Blase diese durch den Anschluß 18 hindurchgedrückt und dadurch beschädigt wird, wenn der Innendruck in der Blase 36 größer wird als der Druck im Anschluß 18. Der Randbereich 44 des offenen Endes 40 der Blase 36 ist als nach innen vorstehender Ringwulst ausgebildet, der in seiner Querschnittkontur der der ersten Ringnut 32 des Verschlußelementes 20 angepaßt ist und zur Verbindung der beiden Teile miteinander in diese zweite Ringnut eingedrückt wird. Der Ringwulst 44 liegt vorzugsweise am äußersten Ende der Blase 36.The closure element 20 has on its outer circumference an annular shoulder 30 which, when the closure element is firmly pressed into the open end 16 of the housing 12, lies axially against the edge of the open housing end 16 and here via an endless weld seam 31 with the Housing end is connected. On the portion of the closure element protruding into the housing, two annular grooves 32, 34 are provided in the outer circumference. The first annular groove 32 serves to connect the closure element 20 to an essentially cylindrical bladder 36, while the second annular groove 34 serves to receive a seal 46, preferably an O-ring. The bladder 36 is made of resilient material such as. B. rubber and has a closed end 38 and an open end 40. In the closed end 38 an expansion limiting element 42 is provided which is intended to prevent the bladder from being pushed through the connection 18 if the bladder is stretched too much and is thereby damaged when the internal pressure in the bladder 36 becomes greater than the pressure in the connection 18 Edge region 44 of the open end 40 of the bladder 36 is designed as an inwardly projecting annular bead which is adapted in its cross-sectional contour to that of the first annular groove 32 of the closure element 20 and is pressed into this second annular groove to connect the two parts to one another. The annular bead 44 is preferably located at the extreme end of the bladder 36.

Der O-Ring 46 in der zweiten Ringnut 34 dient zur Abdichtung zwischen der äußeren Peripherie des Verschlußelementes 20 und der Innenfläche der Blase 36. Die Kombination von Ringwulst 44 und Dichtung 46 ist so ausgelegt, daß dann, wenn das Verschlußelement 20 vollständig in das Gehäuse 12 eingedrückt ist, bis die Ringschulter 30 axial gegen den Rand des offenen Gehäuseendes 16 anliegt, der Ringwulst 44 in die erste Ringnut 32 gepreßt wird. Diese Pressung führt zu einer festen Abdichtung zwischen der äußeren Oberfläche der Blase.36 und der Innenwandung des Gehäuses 12. In Verbindung mit der Dichtung 46 wird dadurch sichergestellt, daß das in der Blase 36 enthaltene Gas sich nicht mit dem Öl vermischen kann, das sich in der von der Blase 36 und dem Gehäuse 12 gebildeten äußeren Kammer befindet. Außerdem kann dieses Abdichtsystem nicht thermisch beschädigt werden, wenn das Verschlußelement 20 mit dem Gehäuse 12 durch die endlose Schweißnaht 31 verbunden wird.The O-ring 46 in the second annular groove 34 serves to seal between the outer periphery of the closure element 20 and the inner surface of the bladder 36. The combination of annular bead 44 and seal 46 is designed so that when the closure element 20 is completely in the housing 12 is pressed in until the annular shoulder 30 lies axially against the edge of the open housing end 16, the annular bead 44 is pressed into the first annular groove 32. This pressure leads to a tight seal between the outer surface of the bladder 36 and the inner wall of the housing 12. In connection with the seal 46, this ensures that the gas contained in the bladder 36 cannot mix with the oil that is being mixed up is located in the outer chamber formed by the bladder 36 and the housing 12. In addition, this sealing system cannot be thermally damaged if the closure element 20 is connected to the housing 12 by the endless weld seam 31.

Die Blase 36 verjüngt sich ausgehend von einem Punkt 48 in der Nähe des inneren Endes 50 des Verschlußelementes 20 bzw. der genannten Dichtung 46 zu ihrem geschlossenen Ende 38 hin leicht konisch. Diese leichte Konizität in der Größenordnung eines halben Grades oder etwas mehr stellt eine gleichmäßige Ausdehnung der Blase 36 und eine entsprechend gleichmäßige Anlage dieser Blase gegen die Innenwandung des Gehäuses 12 sicher, wenn Druckgas in die Blase eingeleitet wird.The bladder 36 tapers slightly conically starting from a point 48 in the vicinity of the inner end 50 of the closure element 20 or the aforementioned seal 46 towards its closed end 38. This slight taper, on the order of half a degree or slightly more, ensures a uniform expansion of the bladder 36 and a correspondingly even abutment of this bladder against the inner wall of the housing 12 when pressurized gas is introduced into the bladder.

Das Druckgefäß 10 wird üblicherweise über seinen Anschluß 18 über eine Hydraulikleitung an ein Hydrauliksystem angeschlossen z. B. an ein Sitzfederungssystem. An das Druckgasventil 24 wird dann eine Gasleitung angeschlossen, um die durch die Blase 36 gebildete innere Kammer mit Gas zu füllen bis zu einem Gasdruck von etwa 6,24 bar (90 psi). Sitzfederungssysteme, die zur Betätigung mit einer Hydraulikflüssigkeit arbeiten, sind für höhere Drücke ausgelegt, die bei 6,93 bis 8,16 bar (100 bis 120 psi) liegen. Die verschiedenen Funktionen des Federungssystems führen dann dazu, daß Hydraulikflüssigkeit durch den Anschluß 18 in die äußere Kammer des Gehäuses 10 gelangt. Da die Hydraulikflüssigkeit einen höheren Druck aufweist als innerhalb der Blase 36 herrscht, wird letztere zusammengedrückt, wodurch sich der ursprüngliche Gasdruck in der Blase erhöht. Das System stabilisiert sich dann, wenn ein Druckausgleich zwischen äußerer und innerer Kammer des Druckgefäßes eingetreten ist. Die Hydraulikflüssigkeit verläßt das Druckgefäß 10 entweder durch Erhöhung des Gasdrucks innerhalb der Blase 36, oder aber durch Verringerung des Hydraulikdrucks innerhalb des Federungssystems. Beim Abfließen der Hydraulikflüssigkeit dehnt sich die Blase 36 wieder zu ihrer ursprünglichen Form aus, so daß sich der Arbeitsvorgang wiederholen kann.The pressure vessel 10 is usually connected via its connection 18 to a hydraulic system via a hydraulic line, e.g. B. a seat suspension system. A gas line is then connected to the pressure gas valve 24 to fill the inner chamber formed by the bladder 36 with gas up to a gas pressure of approximately 6.24 bar (90 psi). Seat suspension systems that operate with hydraulic fluid are designed for higher pressures, which range from 6.93 to 8.16 bar (100 to 120 psi). The various functions of the suspension system then cause hydraulic fluid to pass through the connection 18 into the outer chamber of the housing 10. Since the hydraulic fluid has a higher pressure than inside the bladder 36, the bladder 36 is compressed, which increases the original gas pressure in the bladder. The system stabilizes when there is pressure equalization between the outer and inner chamber of the pressure vessel. The hydraulic fluid leaves the pressure vessel 10 either by increasing the gas pressure within the bladder 36 or by reducing the hydraulic pressure within the suspension system. As the hydraulic fluid drains, the bladder 36 expands back to its original shape so that the operation can be repeated.

Bei dem Zusammenbau des Druckgefäßes 10 muß zuerst das Gehäuse 12 sorgfältig von allen Verunreinigungen wie Öl, Schmutz und anderen Partikeln befreit werden. Anschließend wird in die zweite Ringnut 34 des Verschlußelementes 20 eine Dichtung 46, vorzugsweise ein O-Ring eingelegt. Dann wird das offene Ende 40 der Blase 36 über das innere Ende des Verschlußelementes 20 geschoben, bis der Ringwulst 44 in die erste Ringnut 32 eingreift. Das Verschlußelement 20 wird dann zusammen mit der an ihr hängenden Blase 36 in das Gehäuse 12 eingeschoben und dann unter Druck so weit eingepreßt, bis die Ringschulter 20 des Verschlußelementes axial gegen den Rand des offenen Gehäuseendes 16 anliegt. Das Verschlußelement 20 wird dann mit einer endlosen Schweißraupe 31 oder einem ähnlichen Verfahren mit dem Gehäuse 12 verschweißt. Anschließend wird das Druckgasventil 24 in die Axialbohrung 22 des Verschlußelementes 20 eingeschraubt und über die Mutter 26 festgelegt. Das Druckgefäß 10 ist dann einbaufertig.When assembling the pressure vessel 10, the housing 12 must first be carefully cleaned of all contaminants such as oil, dirt and other particles. Then a seal 46, preferably an O-ring, is inserted into the second annular groove 34 of the closure element 20 inserted. Then the open end 40 of the bladder 36 is pushed over the inner end of the closure element 20 until the annular bead 44 engages in the first annular groove 32. The closure element 20 is then inserted together with the bladder 36 attached to it into the housing 12 and then pressed in under pressure until the annular shoulder 20 of the closure element lies axially against the edge of the open housing end 16. The closure element 20 is then welded to the housing 12 using an endless welding bead 31 or a similar method. The compressed gas valve 24 is then screwed into the axial bore 22 of the closure element 20 and fixed via the nut 26. The pressure vessel 10 is then ready for installation.

Claims (5)

1. A pressure vessel (10), especially an accumulator for a hydraulic system, comprising:
- a cylindrical housing (12) having a closed end (14) and an open end (16), said closed end having a port (18) provided therein;
- a plug like end cap (20) inserted into said open end (16) of said housing (12) being securely fastended to said housing and having an axially extending through hole (22) provided therein, an outer annular shoulder (30) encircling the outer periphery thereof, a first annular groove (32) axially displaced from said shoulder and a second annular groove (34) encircling the outer periphery of said end cap and axially displaced from said first annular groove, said annular shoulder (30) of said end cap (20) abuts axially against the open end (16) of said housing (12) and is fixed thereto by welding whereby the weld (31) completely closes said open end (16) of said housing (12);
- valve means (24) disposed in said axially extending through hole (22) for controlling flow of a gas;
- a bladder (36) being fully retained within said housing (12) by said end cap (20), having a closed end (38) and an open end (40), said open end (40) having an edge portion being designed in form of an inwardly projecting annular protuberant (44) disposed in one annular groove (32) of said end cap (20) and thereby capable of sealing said bladder (36) to the inner surface of said housing (12), said bladder (36) further having a smooth outer peripheral surface constructed with a cylindrical section extending to a point (48) which is near the inner end (50) of said end cap (20) and further having an elogated annular tapered section inclined towards said closed end (38), said taper originating at said point (48);

characterized in that said annular protuberant (44) of said bladder (36) is disposed in said first annular groove (32) of said end cap (20), whereas sealing means (46) is disposed in said second annular groove (34) of said end cap (20) for sealing said bladder (36) to said end cap (20).
2. The pressure vessel of claim 1 wherein said sealing means (46) disposed in said second annular groove (34) is an 0-ring.
3. The pressure vessel of claim 1 or 2, wherein said bladder (36) is a resilient deformable material.
4. The pressure vessel of one of the preceding claims, wherein said first annular groove (32) being larger than said second annular groove (34).
5. The pressure vessel of one of the preceding claims, wherein said valve means (24) is normally closed and is operable to allow bidirectional flow of a gas.
EP81107800A 1980-10-14 1981-10-01 Pressure vessel, in particular accumulator for a fluid system Expired EP0049824B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81107800T ATE8523T1 (en) 1980-10-14 1981-10-01 PRESSURE VESSEL, PARTICULARLY PRESSURE ACCUMULATOR FOR PRESSURE CIRCUITS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US196898 1980-10-14
US06/196,898 US4328836A (en) 1980-10-14 1980-10-14 Pressure vessel

Publications (2)

Publication Number Publication Date
EP0049824A1 EP0049824A1 (en) 1982-04-21
EP0049824B1 true EP0049824B1 (en) 1984-07-18

Family

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EP81107800A Expired EP0049824B1 (en) 1980-10-14 1981-10-01 Pressure vessel, in particular accumulator for a fluid system

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US (1) US4328836A (en)
EP (1) EP0049824B1 (en)
JP (1) JPS5794102A (en)
AR (1) AR229409A1 (en)
AT (1) ATE8523T1 (en)
AU (1) AU549491B2 (en)
BR (1) BR8106605A (en)
CA (1) CA1166551A (en)
DE (1) DE3164895D1 (en)
ES (2) ES273287Y (en)
ZA (1) ZA816606B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785956A (en) * 1982-08-23 1988-11-22 Essef Industries, Inc. Tank fitting for a filament-wound vessel
ES2062919B1 (en) * 1992-10-02 1997-05-01 Fico Cables Sa COVER WITH VOLUMETRIC COMPENSATOR DEVICE FOR HYDRAULIC CYLINDERS THAT WORK UNDER PRESSURE.
US5896843A (en) * 1997-11-24 1999-04-27 Siemens Automotive Corporation Fuel rail damper
US5806705A (en) * 1997-12-05 1998-09-15 Essef Corporation Sealing technique for hydropneumatic pressure vessel
AU2004244652B2 (en) * 2004-01-06 2011-09-29 Eaton Corporation Trapped gas removal in liquid-gas accumulator
US7497202B2 (en) * 2004-10-15 2009-03-03 Robert Bosch Gmbh Hydraulic damper element

Citations (1)

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Publication number Priority date Publication date Assignee Title
US3674054A (en) * 1970-03-06 1972-07-04 Jacques H Mercier Pressure vessel

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
DE1134255B (en) * 1954-02-03 1962-08-02 Jean Mercier Pressure vessel with a bladder
DE1269434B (en) * 1961-05-30 1968-05-30 Jean Mercier Pressure vessel with a flexible and elastic partition
US3256911A (en) * 1964-06-01 1966-06-21 Mercier Olaer Patent Corp Pressure vessel
BE795498A (en) * 1972-03-15 1973-05-29 Mercier Jacques H PRESSURE TANK
US3847182A (en) * 1973-06-18 1974-11-12 E Greer Hydro-pneumatic flexible bladder accumulator
US3907000A (en) * 1974-04-25 1975-09-23 Teledyne Sprague Eng Hydro-pneumatic flexible bladder accumulator
US4162692A (en) * 1976-09-07 1979-07-31 Hydrotrole Limited Hydro-pneumatic flexible bladder accumulator
US4177836A (en) * 1978-10-23 1979-12-11 Deere & Company Disposable pressure vessel

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US3674054A (en) * 1970-03-06 1972-07-04 Jacques H Mercier Pressure vessel

Also Published As

Publication number Publication date
JPS5794102A (en) 1982-06-11
ES273287U (en) 1984-10-16
US4328836A (en) 1982-05-11
ATE8523T1 (en) 1984-08-15
ES516359A0 (en) 1984-03-16
AU7605881A (en) 1982-04-22
ES273287Y (en) 1985-04-16
BR8106605A (en) 1982-06-29
ES8403577A1 (en) 1984-03-16
AR229409A1 (en) 1983-08-15
JPH0138961B2 (en) 1989-08-17
AU549491B2 (en) 1986-01-30
EP0049824A1 (en) 1982-04-21
ZA816606B (en) 1983-04-27
DE3164895D1 (en) 1984-08-23
CA1166551A (en) 1984-05-01

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