EP1243798B1 - Accumulateur hydropneumatique - Google Patents

Accumulateur hydropneumatique Download PDF

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Publication number
EP1243798B1
EP1243798B1 EP02002939A EP02002939A EP1243798B1 EP 1243798 B1 EP1243798 B1 EP 1243798B1 EP 02002939 A EP02002939 A EP 02002939A EP 02002939 A EP02002939 A EP 02002939A EP 1243798 B1 EP1243798 B1 EP 1243798B1
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EP
European Patent Office
Prior art keywords
hose
outer tube
pressure accumulator
closed
accumulator according
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
EP02002939A
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German (de)
English (en)
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EP1243798A1 (fr
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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Filing date
Publication date
Application filed by Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP1243798A1 publication Critical patent/EP1243798A1/fr
Application granted granted Critical
Publication of EP1243798B1 publication Critical patent/EP1243798B1/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
    • 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
    • F15B1/16—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means in the form of a tube
    • F15B1/165—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means in the form of a tube in the form of a bladder
    • 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
    • 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
    • F15B2201/3156—Accumulator separating means having flexible separating means characterised by their attachment
    • 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
    • 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
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S138/00—Pipes and tubular conduits
    • Y10S138/03—Polytetrafluoroethylene, i.e. PTFE

Definitions

  • the invention relates to a hydropneumatic pressure accumulator with the features of the preamble of claim 1.
  • a corresponding pressure accumulator is known from German layout specification 1 165 362, FIGS. 5 and 6.
  • the value of the permissible pressure ratio between the upper operating pressure p 2 and the gas prestressing pressure p o is not as high as would be desirable due to the limits of the load capacity of the hose, which is usually made of rubber.
  • stresses occur, in particular in the form of alternating bending stresses, at the clamping point, so that over a longer period of time there is such a high dynamic stress that material fatigue and ultimately material failure occur.
  • German designation 1 298 795 is a generic, hydropneumatic Accumulator is known with a the accumulator housing forming outer tube, in which a flexible separating element is arranged is that by a section of a in the longitudinal direction of the tube extending hose is formed, forming a seal is anchored to the pipe so that on the outside and inside of the hose each separate receiving spaces formed within the tube and which surrounds a support body having fluid passages, which has a non-circular cross-sectional shape at least in sections, with the hose closed at one end and only at its other open end together with the associated end of the support body is anchored along the outer tube, the size of the outer
  • the surface of the hose is only slightly smaller than the size of the him facing inner surface of the outer tube and being as Support body is provided a tubular body having wall openings, the large part located between its two end areas its length with indentations reducing the pipe cross section is.
  • the invention has the task to create a pressure accumulator of the type mentioned, which is characterized by a comparatively better operating behavior, in particular a higher permissible Excellent pressure ratio.
  • this object is the invention solved in that the tubular body in its from the indentations free end regions are along the inner surface of the outer Tube and extends from this surface at a distance which in corresponds essentially to the strength of the hose.
  • This is the Hose in these areas both on the inside, namely on Tubular body, as well as on its outside, namely by contact with the Inner surface of the outer tube. Because of this invention Arrangement can therefore also be made clear without material failure achieve increased load change numbers.
  • the hose In relation to the dimensioning of the sizes of the corresponding surfaces, for example, in operating states in which a gas prestressing pressure (P 0 ) acting on the outside of the hose exceeds the prevailing operating pressure or in which there is no operating pressure, the hose is tension-free and compression-free Support body guided close. This enables the accumulator to be easily handled in the pre-filled state with the oil side depressurized. If there is a loss of the preload pressure (P o ), so that the gas side of the accumulator is depressurized, then the hose is tension-free in contact with the inner surface of the outer tube in the intended dimensioning.
  • P o gas prestressing pressure
  • the hose in the free space between the support body and the outer tube in turn assumes the position corresponding to the pressure compensation without tension.
  • the limit for the level of the permissible upper operating pressure (P 2 ) is determined only by the structural strength of the storage housing formed by the outer tube.
  • the size of the outer surface of the support body is only slightly smaller than that of the inner surface of the hose facing it.
  • the hose surrounds the support body relatively loosely, that is, the hose rests without tension in contact with the outer surface of the support body in an operating state in which the pretensioning pressure (p 0 ) exceeds the operating pressure (p), or in the absence of operating pressure.
  • the arrangement can be such that the outer surface of the support body is slightly larger than the inner surface of the hose, when it is in an unstretched state. In this case it is Hose in all operating conditions with a slight preload.
  • the inner support body can have openings in the form of a wall Be tubular body formed on one between its two Most of its length at the end areas are provided with indentations that reduce the pipe cross-section, but not the surface area the outer surface of the tubular body.
  • the area-by-area compression or squeezing the tube body reduces the volume of the receiving space inside the hose, normally of the oil room. This also determines the maximum usable ⁇ V of the hose storage.
  • the outer surface of the tubular body is also in the the indentations have length range on longitudinally extending Circumferential areas of the outer tube at a distance from the inner one Surface which essentially corresponds to the thickness of the hose, so that this also extends over its entire length range is guided between the tube body and the outer tube.
  • Pressure accumulator has a metallic accumulator housing in the form of a Tube 1, which at its left-hand end in Fig.1 by a outwardly curved wall part 3 is closed.
  • the tube 1 has how out Fig.2 can be seen, a circular cross-section, and the arched Wall part 3 at the closed pipe end is accordingly hemispherical.
  • the end wall part 3 in one piece with the remaining tube 1 by means of deep-drawing or extrusion processes manufactured. It goes without saying that, for example, with longer lengths the end wall part 3 is a separate one, for example by welding attached component can be.
  • the tube 1 is through a pressed-in closing body 5 closed, which has a centrally located through hole 7, which has a to the inner receiving space of the passage leading passage forms.
  • the one at the outer end of the Hole 7 is the fitting for the corresponding oil connection not shown.
  • the bore 7 could also in a not shown Embodiment may be arranged off-center.
  • the oil space 9 is separated from the gas space 13 directly adjacent to the inner surface 11 of the tube by a flexible separating element in the form of a hose 15, which is closed at its end 17 on the left in FIG. 1 and with its end on the right in FIG 19 is anchored to the end body 5, which will be discussed in more detail below.
  • a gas valve which enables the filling of the gas space 13 to build up a desired preload pressure p 0 is designated by 21.
  • existing hose 15 extends into the interior a tubular body 23 which at the open end 19 of the hose 15 adjacent end 25 open and at its opposite end 27 is closed, this closed end 27 one the end Wall part 3 of the outer tube 1 adapted hemispherical arched Has shape and is at a distance with its outer surface extends along the inner surface of the wall part 3 on the outer tube 1, which corresponds to the thickness of the hose 15, so that it is in the relevant one Area both on the outer tube 1 and on the inner tube body 23 is guided.
  • the wall of the tubular body 23 has through holes 29 evenly distributed, the fluid passages Form from the oil space 9 to the inside of the hose 15. at higher pressures, the through holes can also be provided 29 to be arranged unevenly, in particular on one side and / or on one deepest point of the memory.
  • the open end 25 of the closed end 27 opposite the Tubular body 23 is together with the associated end 19 of the hose 15 anchored in a recess 31 machined in the end body 5.
  • the recess 31 is so in the peripheral surface of the end body 5 incorporated that they differ from the interior facing the oil space 9 End face 33 extends into the vicinity of the outer end face 35.
  • the recess 31 has a step 37, into which the end 25 of the tubular body 23 engages.
  • the recess 31 has a radial inwardly extending annular groove 39 in which the folded end 19th the hose 15 is received, which extends along the inner surface of the outer tube 1 beyond the range of step 37 inside the recess 31 extends.
  • the closing body 5 forms one in the outer Tube 1 pressed in the clamping body, which in the area of stage 37 the recess 31 engaging tubular body 23 and this area overlapping, extending in the recess 31 to the groove 39 end of the hose 5 fluid-tight along the inner surface of the outer tube 1 anchored.
  • the sealing and fixing bead can be used at the free end of the hose 15 also on its training as independent molding can be obtained.
  • the tubular body 23 is pressed or squeezed out of its original circular cross-sectional shape in its length region located between the ends 25 and 27 from two opposite sides in such a way that two longitudinally extending indentations 41 are formed , that is, a non-circular cross-sectional shape in the form of an "8 ".
  • the indentations 41 are pressed in so far that the walls of the tubular body 23 practically touch one another in the region of the greatest depth of the indentations, ie along the central longitudinal axis of the tubular body 23.
  • the areas 43, not depressed, located to the side of the indentations 41 see Fig.
  • the entire surface of the outer surface of the tubular body 23 is therefore only slightly smaller than the facing inner surface 11 of the outer tube 1.
  • the main sealing function is preferably achieved via the respective bead-like configuration of the hose 15.
  • the prestressing pressure p 0 prevailing in the gas space 13 is equal to or greater than the pressure prevailing in the oil space 9.
  • the dimensions of the sizes of the mutually facing surfaces of the tubular body 23 and the hose 15 are selected so that the hose 15 is guided over the entire outer surface of the tubular body 23. If the operating pressure p 1 prevailing in the oil chamber 9 exceeds the prestressing pressure p 0 in the gas chamber 13, the hose 15 lifts off the tubular body 23 in order to reduce the volume of the gas chamber 13 until the pressure equilibrium is reached. Due to the only one-sided clamping on the end body 5, this movement of the hose 15 takes place without tensile or bending forces on the clamping.
  • the size of the permissible prestressing pressure p 0 is also dependent on the size of the through bores 29 in the tubular body 23, the diameter of which is to be selected such that the material of the hose 15 is not pressed in the holes 29 can take place. Due to the same surface geometries, there is no stretching stress, so that the tensile and bending forces which arise from the movement of the hose 15 are significantly minimized.
  • the tubular body 23 can be a metallic one Be tube that mechanically compressed to form the indentations 41 , but can also be molded as a plastic injection molded part or also be formed by a sieve-like component, a wire mesh or the like.
  • FIG 3 shows a further embodiment, compared to the example 1 and 2 is modified in that the gas valve 21st now on the wall part forming the end of the tube 1 3 is arranged centrally.
  • This arrangement has the advantage that on lateral outline of the housing formed by the tube 1 no projection located.
  • the hose 15 is on its outside in the area extending from the closed end 17 at the muzzle of the gas valve 21 extends to the area of the gas space 13, which adjoins the indentation area of the tubular body 23 with provided at least one groove-like depression, so that at least one Channel 51 is formed as a passage to the gas space 13.
  • 1 to 3 show embodiments in which the tubular body 23 only pressed in from two opposite sides is so that two longitudinal recesses 41 are formed
  • 4 shows a modified embodiment in which the tubular body 23 is pressed in from four sides, so that four indentations 41 are formed, two of which lie opposite each other in pairs.
  • the original is also here circular cross section of the tubular body 23 to an out-of-round, star-like Cross-sectional shape with reduced interior deformed without reducing the size to reduce the outer surface, ie the contact surface for the hose 15.
  • the tubular body 23 is in the embodiment of Figure 4 in the ends adjacent to the outer tube 1, End areas not pressed in are formed analogously, as in the exemplary embodiments from Fig. 1 to 3.
  • Pressure accumulator can be used for energy storage, for example in connection with vehicle suspensions, or as a pulsation damper. Furthermore, the solution according to the invention is particularly suitable for the damping of pressure peaks in hydraulic or other fluid technology Systems. In all cases, the invention is distinguished Pressure accumulator is characterized by a long service life, which due to the low, stresses on the hose that occur during operation are guaranteed is.

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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)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Pipe Accessories (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Claims (12)

  1. Accumulateur de pression hydropneumatique avec un tuyau (1) extérieur formant le boítier de l'accumulateur, à l'intérieur duquel est disposé un élément de séparation souple qui est formé par un segment d'un tuyau flexible (15) s'étendant en direction longitudinale du tuyau (1), lequel tuyau flexible est ancré au tuyau (1) en formant un colmatage de manière à ce que, sur le côté externe et le côté interne du tuyau flexible (15), des espaces de réception (9 et 13) séparés les uns des autres soient respectivement formés à l'intérieur du tuyau (1), et lequel entoure un corps de support (23) présentant des passages de fluide (29) présentant au moins partiellement une forme de profil transversal ovalisée, moyennant quoi le tuyau flexible (15) est fermé à l'une de ses extrémités (17) et est ancré uniquement par son autre extrémité ouverte (19) avec l'extrémité (25) associée du corps de support (23) le long du tuyau (1) extérieur, où la taille de la surface externe du tuyau flexible (15) n'est que légèrement inférieure à la taille de la surface interne (11) lui faisant face du tuyau extérieur (1), et où est prévu, en guise de corps de support, un corps tubulaire (23) présentant des perçages de paroi (29), lequel est pourvu sur une grande partie de sa longueur située entre ses deux zones d'extrémité, de creux (41) diminuant le profil transversal de tuyau, caractérisé en ce que le corps tubulaire (23), dans ses zones d'extrémités libres des creux (41), s'étend le long de la surface interne du tuyau (1) extérieur et à une distance de cette surface laquelle correspond essentiellement à l'épaisseur du tuyau flexible (15).
  2. Accumulateur de pression selon la revendication 1, caractérisé en ce que la taille de la surface externe du corps de support (23) n'est que légèrement inférieure à celle de la surface interne lui faisant face du tuyau flexible (15).
  3. Accumulateur de pression selon la revendication 1, caractérisé en ce que la taille de la surface externe du corps de support (23) est légèrement supérieure à celle de la surface interne lui faisant face du tuyau flexible (15).
  4. Accumulateur de pression selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le tuyau (1) extérieur est fermé à l'extrémité (3) voisine de l'extrémité (17) fermée du tuyau flexible (15).
  5. Accumulateur de pression selon la revendication 4, caractérisé en ce qu'à l'extrémité (3) fermée du tuyau (1) extérieur, une soupape de gaz est prévue, et en ce que la surface externe du tuyau flexible (15) qui jouxte la soupape présente au moins un renfoncement semblable à un sillon pour former un canal (51) menant de la soupape de gaz (21) vers l'espace gamma (13).
  6. Accumulateur de pression selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le corps tubulaire (23) servant de corps de support possède également dans la zone de longueur présentant les creux (41), une distance par rapport à la surface interne du tuyau (1) extérieur sur des zones périphériques s'étendant longitudinalement de celui-ci, laquelle distance correspond essentiellement à la dimension du tuyau flexible (15).
  7. Accumulateur de pression selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le tuyau (1) extérieur est fermé à l'extrémité voisine de l'extrémité fermée (17) du tuyau flexible (15) par une partie de paroi (3) bombée vers l'extérieur, et en ce que l'extrémité (27) du corps tubulaire (23) faisant face à cette partie de paroi (3) est fermée avec un bombement correspondant dont la surface externe s'étend le long de cette partie de paroi (3) bombée et à une distance de celle-ci, laquelle correspond essentiellement à l'épaisseur du tuyau flexible (15).
  8. Accumulateur de pression selon l'une quelconque des revendications 4 à 7, caractérisé en ce que le tuyau (1) extérieur est fermé sur l'extrémité opposée à l'extrémité fermée (17) du tuyau flexible (15) par un corps de fermeture (5), dans lequel l'extrémité (25) du corps de support (23) faisant face le long de l'extrémité associée du tuyau (1) extérieur, ainsi que l'extrémité ouverte (19) du tuyau flexible (15), sont ancrés de manière à ce que sa surface externe est colmatée vers la surface interne du tuyau extérieur (1), et que la surface interne du tuyau flexible (15) est colmaté vers le corps de fermeture (5).
  9. Accumulateur de pression selon l'une quelconque des revendications 1 à 8, caractérisé en ce que le corps de support (23) présente deux creux (41) s'étendant longitudinalement, opposés l'un par rapport à l'autre et s'alignant ensembles, lesquels s'étendent respectivement de bout en bout, de zone d'extrémité à zone d'extrémité, du corps de support (23).
  10. Accumulateur de pression selon la revendication 9, caractérisé en ce que la profondeur des deux creux (41) est de même taille et est choisie de manière à ce que les zones s'étant le plus rapprochées les unes des autres des parois se faisant face du corps de support (23), s'étendent sur une partie de leur longueur avec un espacement étroit et réciproque, ou en se touchant (figure 2).
  11. Accumulateur de pression selon l'une quelconque des revendications 1 à 10, caractérisé en ce que le corps de support (23) présente plusieurs creux (41) répartis le long de son pourtour, disposés de préférence par paires qui se font face, et s'étendant longitudinalement.
  12. Accumulateur de pression selon l'une quelconque des revendications 1 à 11, caractérisé en ce que le tuyau flexible (15) est fabriqué en un matériau à faible expansibilité, par exemple en PTFE.
EP02002939A 2001-03-20 2002-02-11 Accumulateur hydropneumatique Expired - Lifetime EP1243798B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10113415 2001-03-20
DE10113415A DE10113415A1 (de) 2001-03-20 2001-03-20 Hydropneumatischer Druckspeicher

Publications (2)

Publication Number Publication Date
EP1243798A1 EP1243798A1 (fr) 2002-09-25
EP1243798B1 true EP1243798B1 (fr) 2004-03-17

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US (1) US6789577B2 (fr)
EP (1) EP1243798B1 (fr)
AT (1) ATE262116T1 (fr)
DE (2) DE10113415A1 (fr)

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DE50200289D1 (de) 2004-04-22
US6789577B2 (en) 2004-09-14
US20020134446A1 (en) 2002-09-26
DE10113415A1 (de) 2002-10-02
EP1243798A1 (fr) 2002-09-25

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