EP2126368B1 - Récipient sous pression, notamment accumulateur hydraulique - Google Patents

Récipient sous pression, notamment accumulateur hydraulique Download PDF

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Publication number
EP2126368B1
EP2126368B1 EP07856342A EP07856342A EP2126368B1 EP 2126368 B1 EP2126368 B1 EP 2126368B1 EP 07856342 A EP07856342 A EP 07856342A EP 07856342 A EP07856342 A EP 07856342A EP 2126368 B1 EP2126368 B1 EP 2126368B1
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EP
European Patent Office
Prior art keywords
folds
pressure tank
tank according
fold
membrane
Prior art date
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Application number
EP07856342A
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German (de)
English (en)
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EP2126368A1 (fr
Inventor
Herbert Baltes
Markus Lehnert
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.)
Hydac Technology GmbH
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Hydac Technology GmbH
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Publication date
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Publication of EP2126368A1 publication Critical patent/EP2126368A1/fr
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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
    • 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
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • 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
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows
    • 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
    • F15B2201/3155—Accumulator separating means having flexible separating means characterised by the material of the flexible separating means

Definitions

  • the invention relates to a pressure vessel, in particular to a hydraulic accumulator, with a space in the container for a first, in particular gaseous, working fluid from a space for a second working medium, in particular a fluid, separating, resilient and deformable under deformation separating element, the one Defined by an annular edge, curved main-separating surface defined, wherein the separating element defines a curved main-separating surface, on whose relative to the curvature on the inner side annular bead-like elevations are formed protruding.
  • a generic pressure vessel is from the WO 02/075161 A1 known.
  • the known hydropneumatic accumulator has a storage housing and a therein, a movable partition between a first space, in particular a gas space, and a second space, in particular a liquid space, forming membrane.
  • the membrane has a plurality of annular areas, the annular, in the Type of joints acting weak points are connected to each other, wherein the ring areas on the side facing away from the wall of the storage enclosure inside of the membrane surveys, which in the central region between adjacent weak points the largest, the wall thickness of the membrane increasing height and one of these weak points towards each falling gently and at least have a convex shape in some areas.
  • These weak points extend on the inside of the membrane along the circumferential line concentric circular lines. In the ring areas between the weak points are flat, bead-like elevations.
  • US 5,217,797 A is a suitable for a pressure vessel membrane has become known.
  • the membrane is composed of a series of layers, a solid polytetrafluoroethylene (PTFE) layer and a layer of flexible plastic.
  • the composite membrane may comprise an elastomeric layer having concentrically disposed ribs.
  • the elastomeric layer may be bonded directly to the PTFE solid layer which is bent using the membrane.
  • WO 98/55781 A relates to a membrane of a stiff, non-stretchable material having an outer chucking edge and a center movable transversely to its edge and having a profile which is incorporated in the surface of the membrane and which has wave, pleat or groove-shaped structures.
  • the volumetric cavity arrangement in particular makes the use of the membrane for hydraulic accumulators seem suitable.
  • WO 98/55782 A relates to a membrane with reusable compensation of compression for better operation.
  • This is provided with a profile, which is aligned in particular in a central region in neither radial nor in the circumferential direction.
  • the diaphragm also compensates for the compression, as in the past, but additionally the compression occurring at an angle. For example, grooves from the direction of the membrane edge extend spirally in an arc in the approximate direction to the membrane center.
  • a pressure vessel in the form of a hydraulic accumulator is in the DE 28 52 912 A1 disclosed.
  • the resilient separating element which in the known hydraulic accumulator consists of a rubber-like material (synthetic rubber, such as acrylonitrile-butadiene rubber) forms a deformable by deformation membrane which separates a gas side in the storage housing from a liquid side.
  • synthetic rubber such as acrylonitrile-butadiene rubber
  • impermeability of the membrane must be ensured in order to avoid gas diffusion.
  • corresponding mechanical properties of the membrane are required, in particular easy mobility and high bending fatigue strength, which are maintained even under the influence of aggressive media.
  • the invention has the object to provide a pressure vessel, in particular hydraulic accumulator available, which in contrast is characterized by a significantly improved performance.
  • a separating element is provided in the pressure vessel, which is made of a fluoroplastic material or preferably consists entirely of fluorine plastic material, on the one hand excellent diffusion tightness is ensured, while on the other hand a fuel element is available, the which has optimum mechanical properties such as extreme fatigue strength for use as a membrane in hydraulic accumulators. It can therefore be used very small wall thicknesses, resulting in the desired easy mobility of the membrane leads. Due to the resulting good response of the pressure vessel is therefore particularly suitable for use as a pulsation damper.
  • a particularly suitable material is polytretafluoroethylene.
  • Polytetrafluoroethylene is not plastically moldable because of its very high melt viscosity, and the particular desired shaped body of this material is cold pressed from powdered raw material with 200 to 400 bar and sintered at 370 ° to 380 ° without pressure. If you want to receive films, they are regularly peeled off from cylindrical solid blocks. Accordingly, polytetrafluoroethylene is regularly marketed in the form of rigid solids in the trade such as plates, rods, tubes, etc. It is surprising to one of ordinary skill in the membrane art that he can still obtain wholly or partially made of polytetrafluoroethylene material separator elements which have a have such high mobility that they can even take over the function of a flexible rolling membrane.
  • the pressure vessel according to the invention is also suitable for use in the presence of chemically aggressive media.
  • the annular bead-like elevations are formed by folding, which are open on the outer side and here form annular groove-like recesses in the main separating surface.
  • the height of the folds in the case of a membrane formed in this way, as is the case with a bellows, a particularly large length of the material web is available, which can be moved in order to roll or extend the membrane.
  • successive elevations are separated from each other by flat wall sections extending along the main parting surface. Therefore, there is a free space between adjacent ridges, which is available for relative movements of adjacent ridges, so that, without adjacent annular ridges would support each other and stiffen the structure, the separator may deform in the manner of a rolling diaphragm.
  • the vertexes of the annular bead-like elevations have a circular curvature, so that notch effects are avoided.
  • the arrangement here is such that the height measured from the open end to the apex of the folds along their vertical axis is different from at least one fold with respect to the height of other folds.
  • the wall section extending from the annular edge to the nearest first fold has a wall thickness which has the largest value at the annular edge and drops to the first fold towards the value of the wall thickness of the wall sections between the folds.
  • the edge thickening thus formed favors, without impairing the flexibility of the remaining membrane, the clamping of the membrane on the associated housing element of the pressure vessel and the formation of a sealing connection at the clamping point.
  • FIG. 1 Of an embodiment of the pressure vessel according to the invention in the form of a hydraulic accumulator are in Fig. 1 only one lower housing part 3 with a concentric to GeHouselärigsachse 7, bottom-side fluid port 9 and a part of the lower housing part 3 adjacent to the housing upper part 5 is shown. At the junction between the lower housing part 3 and the upper housing part 5 is the open, annular edge 13 clamped a separating element in the form of a designated as a whole with 1 rolling diaphragm.
  • an edge thickening 21 of the rolling diaphragm 1 is supported, on the one hand, on an annular surface 22 of the lower housing part 3 and, on the other hand, abuts an O-ring 15, which in turn sits in an annular groove 20 on an axially projecting annular body 14 of the upper housing part 5.
  • Fig. 1 and 2 show the rolling diaphragm 1 in a fully unrolled or extended condition in which the in Fig. 1 located above the diaphragm 1 space 11, the gas side of the hydraulic accumulator, the largest volume and the fluid port 9, there is no fluid pressure, so that the membrane 1 rests against the inner wall of the housing part 3, wherein a central reinforcing bead 29 of the membrane 1, the edge of the Fluid terminal 9 overlaps and thus forms a mechanical safeguard against a depression of the membrane 1 in the fluid port 9 in the absence of fluid pressure.
  • FIGS. 2 and 3 clarify details of the rolling diaphragm produced from a PTFE material 1. Because of the very good diffusion-tightness of the PTFE material and the particularly good strength properties for the rolling diaphragm 1 only a small wall thickness of the membrane in their emanating from the annular edge 13 course is required, which domed main interface defined. From this main separation surface successive ring-bead-like elevations project inwards, which are not formed by beads in the form of solid body in the example shown, but are formed by folding, of which a first, the edge 13 nearest fold is denoted by 17 and the subsequent folds are each denoted by 19. How out Fig.
  • FIG. 1 can be seen changes, starting from the wall thickening 21 at the annular Edge 13, the wall thickness in such a way that the wall thickness decreases to the first fold 17, namely to the thickness value of flat wall portions 23, which are respectively between the folds 17 and 19.
  • the wall thickness drops from the thickening 21 to the first fold 17 from a value of 1.2 mm down to the value of 0.5 mm, which is given at the successive wall sections 23 between the folds 17 and 19 respectively is.
  • Fig. 2 also shows, forms the edge thickening 21 on the inside of a kind of shell shape, a Detailum charged of in Fig. 2 not shown O-ring 15 forms.
  • Fig. 2 It can also be seen that the wrinkle height measured along the vertical axis 25 is less in the first fold 17 than in the subsequent folds 19, which each have the same height, with all the folds 17 and 19 being circular at their apex.
  • the folds 17 and 19 are open at the outer side with respect to the curvature, so that annular groove-like recesses 27 (see in particular FIG Fig. 3 ) are formed, each forming interruptions in the curvature of the main separation surface between the wall sections 23. How special Fig.
  • the clear width of the annular groove-like recesses 27 at the open end of the folds 17, 19 each substantially less than the measured along the vertical axis 25 pleat height, and indeed in the example shown, the height of the folds 19 about a factor of 4 larger.
  • the inner sides of the depressions 27 of the folds 17, 19 run slightly diverging towards the open end, so that the open end of the depressions 27 has a greater width than the bottom of the depressions 27 at the vertex area of the folds.
  • the vertical axes 25 of the folds 19 each extend approximately perpendicular to the tangential plane to the adjacent wall portions 23, while the vertical axis 25 of the first fold 17 is slightly inclined to this tangential plane, wherein the vertical axis 25 of the first fold 17 with the plane of the annular edge 13 forms an angle of about 10 °.
  • the vertical axes 25 are increasingly inclined from fold to fold to the plane of the edge 13.
  • annular bead-like elevations are formed by folding 17 and 19, resulting in a particularly easy mobility for curling the membrane.
  • ring-bead-like elevations could be provided.
  • unfilled PTFE materials or those with filler and / or filler combinations as may be provided in a manner known per se with PTFE materials, for example when extreme temperature resistance or other special properties are desired.
  • Glass fiber materials, carbon or metallic fillers may be considered among others.
  • PTFE materials are semi-finished in many forms available, for example, blocks peeled from slabs, rods, rounds and the like. Due to the mechanical properties of finished products, such as the rolling membrane used in the pressure vessel according to the invention, can be prepared by machining of moldings, which in turn are pressed from powdered raw material and sintered. In particular, in the case of thin-walled products, shaping by blow-molding of a PTFE dispersion before sintering is also possible. Unless the in Fig. 1 obtained membrane ball mold is obtained from a polytetrafluoroethylene full body, this is then by machining of the green body into the separation membrane shape shown. In order to minimize the polytetrafluoroethylene waste produced during the cutting process, it is preferable to produce a preform body as a blank in a half-shell mold as a press mold.
  • the said polytetrafluoroethylene material as the fluoroplastic material may comprise both pure PTFE and modified PTFE and include both unfilled PTFE and PTFE compounds.
  • modified PTFE material fillers such as bronze, carbon dust, MoS 2 and glass fiber and carbon fiber materials come into question.
  • other fluoroplastic materials include ethylene tetrafluoroethylene (ETFE), ethylene chlorotrifluoroethylene copolymer (ECTFE), polychlorotrifluoroethylene copolymer (PCTFE), perfluoroalkoxy copolymer (PFA), polyvinylidene fluoride (PVDF) and tetrafluoroethylene-perfluoropropylene (FEP).

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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)
  • Diaphragms And Bellows (AREA)

Claims (9)

  1. Récipient sous pression, notamment accumulateur (3) hydraulique, comprenant un élément (1) de séparation qui sépare un espace (11) dans le récipient pour un premier fluide de travail, notamment gazeux, d'un espace pour un deuxième fluide de travail, notamment un fluide qui est mobile sous déformation, et qui définit une surface de séparation principale cintrée partant d'un bord (13) annulaire et sur la face intérieure rapportée au cintrage duquel sont formées en saillie des surélévations (17, 19) de type en bourrelet annulaire, caractérisé en ce que l'élément (1) de séparation est en un matériau ayant une matière plastique fluorée, en étant de préférence en un matériau constitué en entier d'une matière plastique fluorée, et en ce que les surélévations de type en bourrelet annulaire sont formées par des plis (17, 19) qui sont ouverts sur la face extérieure et y forment des cavités (27) de type en rainure annulaire dans la surface de séparation principale.
  2. Récipient sous pression suivant la revendication 1, caractérisé en ce que des surélévations (17, 19) successives sont séparées les unes des autres respectivement par des segments (23) de paroi plats, s'étendant le long de la surface principale.
  3. Récipient sous pression suivant la revendication 1 ou 2, caractérisé en ce que les sommets des plis (17, 19) ont une courbure circulaire.
  4. Récipient sous pression suivant l'une des revendications 1 à 3, caractérisé en ce que la hauteur, mesurée de l'extrémité ouverte jusqu'au sommet des plis (17, 19) le long de leur axe (25) vertical, d'au moins un pli (17) est différente de la hauteur d'autres plis (19).
  5. Récipient sous pression suivant la revendication 4, caractérisé en ce que le premier pli (17) le plus proche du bord (13) annulaire a une hauteur plus petite que les autres plis (19) venant ensuite.
  6. Récipient sous pression suivant la revendication 4 ou 5, caractérisé en ce que la hauteur des plis (17, 19) est au moins deux fois plus grande que la largeur, mesurée à l'extrémité ouverte des plis (17, 19), des cavités (27) de type à rainure annulaire qui sont formées.
  7. Récipient sous pression suivant l'une des revendications 4 à 6, caractérisé en ce que les axes (25) verticaux de plis (17, 19) successifs sont inclinés suivant un angle petit les uns par rapport aux autres.
  8. Récipient sous pression suivant l'une des revendications 1 à 7, caractérisé en ce que les segments (23) de paroi plats, s'étendant entre des plis (17, 19) successifs, ont respectivement la même épaisseur de paroi.
  9. Récipient sous pression suivant la revendication 7, caractérisé en ce que le segment de paroi, s'étendant du bord (13) annulaire au premier pli (17) suivant immédiatement, a une épaisseur de paroi, qui a la valeur la plus grande au bord (13) annulaire et qui diminue entre les plis (17, 19) jusqu'au premier pli (17) jusqu'à la valeur de l'épaisseur de paroi des segments (23) de paroi.
EP07856342A 2007-01-25 2007-12-04 Récipient sous pression, notamment accumulateur hydraulique Active EP2126368B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007003724A DE102007003724A1 (de) 2007-01-25 2007-01-25 Druckbehälter, insbesondere Hydrospeicher
PCT/EP2007/010500 WO2008089812A1 (fr) 2007-01-25 2007-12-04 Récipient sous pression, notamment accumulateur hydraulique

Publications (2)

Publication Number Publication Date
EP2126368A1 EP2126368A1 (fr) 2009-12-02
EP2126368B1 true EP2126368B1 (fr) 2011-11-23

Family

ID=39123749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07856342A Active EP2126368B1 (fr) 2007-01-25 2007-12-04 Récipient sous pression, notamment accumulateur hydraulique

Country Status (6)

Country Link
US (1) US8418726B2 (fr)
EP (1) EP2126368B1 (fr)
JP (1) JP5319551B2 (fr)
AT (1) ATE534824T1 (fr)
DE (1) DE102007003724A1 (fr)
WO (1) WO2008089812A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009021463A1 (de) * 2009-05-15 2010-11-18 Hydac Technology Gmbh Hydrospeicher
DE102010050113B4 (de) 2010-10-29 2012-06-21 Mt Aerospace Ag Behälter zum Aufnehmen, Speichern und Abgeben von gasförmigen, flüssigen und festen Medien sowie dessen Verwendung
DE102011111098A1 (de) * 2011-08-19 2013-05-16 Hydac Technology Gmbh Druckbehälter
DE102011117489B4 (de) * 2011-10-27 2015-04-02 Astrium Gmbh Treibstofftank
DE102014005511A1 (de) * 2014-04-12 2015-10-15 Hydac Technology Gmbh Speichereinrichtungen und Montageverfahren zum Herstellen von solchen Speichereinrichtungen
IT201800004751A1 (it) * 2018-04-20 2019-10-20 Smorzatore idropneumatico
DE102018003644A1 (de) 2018-05-04 2019-11-07 Hydac Technology Gmbh Dämpfungsvorrichtung

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343320A (en) * 1940-03-18 1944-03-07 Parker Appliance Co Accumulator
US2360590A (en) * 1942-11-30 1944-10-17 Gen Motors Corp Pressure tank
US2924359A (en) * 1957-02-15 1960-02-09 Thompson Ramo Wooldridge Inc Expulsion bag fuel tank
US3162213A (en) * 1962-06-13 1964-12-22 Melville F Peters Surge attenuating devices
US3592360A (en) * 1967-06-28 1971-07-13 Arde Inc Cylindrical fluid storage and expulsion tank
US3727642A (en) * 1968-09-16 1973-04-17 Opti Cap Inc Vacuum compensating device for engine cooling system and method of installing same
FR1605326A (fr) * 1968-11-05 1974-08-02
DE2361261A1 (de) * 1973-12-08 1975-06-12 Daimler Benz Ag Rollmembran
DE2852912A1 (de) 1978-12-07 1980-06-26 Bosch Gmbh Robert Elastische trennwand fuer druckbehaelter
US5133387A (en) * 1990-09-20 1992-07-28 The Aro Corporation Fluid pulsation dampener having spiral grooved bellows
US5217797A (en) * 1992-02-19 1993-06-08 W. L. Gore & Associates, Inc. Chemically resistant diaphragm
WO1998055781A1 (fr) * 1997-06-04 1998-12-10 Hydac Technology Gmbh Membrane a compensation multidirectionnelle de l'ecrasement
DE19924807A1 (de) * 1999-05-29 2000-12-07 Hydac Technology Gmbh Hydropneumatischer Druckspeicher
JP3610272B2 (ja) * 1999-11-29 2005-01-12 日本ピラー工業株式会社 ベローズを有する流体機器
DE10112976A1 (de) * 2001-03-17 2002-10-02 Hydac Technology Gmbh Hydropneumatischer Druckspeicher
DE102004004341A1 (de) * 2004-01-29 2005-08-18 Hydac Technology Gmbh Druckspeicher, insbesondere Pulsationsdämpfer
JP4641387B2 (ja) * 2004-06-01 2011-03-02 日産自動車株式会社 流体継手
US6948479B1 (en) * 2004-09-01 2005-09-27 Delphi Technologies, Inc. Inline pulsation damper system

Also Published As

Publication number Publication date
DE102007003724A1 (de) 2008-07-31
US8418726B2 (en) 2013-04-16
JP2010516964A (ja) 2010-05-20
EP2126368A1 (fr) 2009-12-02
JP5319551B2 (ja) 2013-10-16
US20100071792A1 (en) 2010-03-25
ATE534824T1 (de) 2011-12-15
WO2008089812A1 (fr) 2008-07-31

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