EP2488762B1 - Accumulateur de pression hydropneumatique - Google Patents

Accumulateur de pression hydropneumatique Download PDF

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Publication number
EP2488762B1
EP2488762B1 EP10750058.9A EP10750058A EP2488762B1 EP 2488762 B1 EP2488762 B1 EP 2488762B1 EP 10750058 A EP10750058 A EP 10750058A EP 2488762 B1 EP2488762 B1 EP 2488762B1
Authority
EP
European Patent Office
Prior art keywords
valve body
valve
pressure accumulator
projections
hydropneumatic pressure
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.)
Active
Application number
EP10750058.9A
Other languages
German (de)
English (en)
Other versions
EP2488762A2 (fr
Inventor
Norbert Lange
Norbert Weber
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
Original Assignee
Hydac Technology GmbH
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
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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
    • F15B1/18—Anti-extrusion means
    • F15B1/20—Anti-extrusion means fixed to the 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
    • 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
    • F15B1/22—Liquid port constructions
    • 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
    • F15B2201/43—Anti-extrusion means
    • F15B2201/435—Anti-extrusion means being fixed to the separating means

Definitions

  • the invention relates to a hydropneumatic pressure accumulator having the features in the preamble of claim 1.
  • the gas-side working space is usually prefilled with a high biasing pressure working gas, in particular N 2 , which may be biasing pressures of the order of 100 bar.
  • a hydraulic system is connected to the housing opening having an oil connection in operation and the pressure of the hydraulic oil of the connected hydraulic system is in the range of the intended operating pressure, the flexible membrane in the region of the fluid pressure leading fluid chamber is so far from the inner wall of the storage housing that the Volume reduction, which results from the bulging of the membrane from the fluid-side inner wall of the storage housing, the original pre-charge po to a pressure p 1 (current working pressure) raises, wherein pressure equilibrium prevails on the membrane.
  • p 1 current working pressure
  • the closure of the housing opening is advantageous in that the diaphragm accumulator has no open housing opening prior to installation in a particular hydraulic system and after the desired full filling pressure has been established in the gas space, because the opening forming the oil connection is closed by the membrane.
  • the prefilled storage can therefore be handled, stored and transported, without any fear that impurities or foreign bodies could enter through the housing opening forming the oil connection.
  • the membrane in the region of oil pockets on the inner wall of the storage housing is not the entire surface, but the volume of the oil pockets correspondingly slightly lifted, resulting in a corresponding reduction in volume of the gas space compared to its determined by the geometry of the storage housing largest volume ,
  • the gas bias pressure in the gas space does not correspond to the predetermined value po but to a higher gas bias pressure.
  • the set pressure of the Memory ie, the opening pressure p 1 increases.
  • the valve assembly in an accumulator of the type mentioned in such a way that at the closed position a limited flow through the housing opening enabling bypass arrangement is formed.
  • the bypass arrangement is formed by the fact that at the serving as a valve seat for the valve body edge of the housing opening of the storage housing grooves are provided which are incorporated in the valve seat surface forming edge of the housing opening of the storage enclosure. The formation of the grooves requires an increased production cost in the manufacture of the housing.
  • there is a risk that material of the valve body is pressed into the grooves with a corresponding yielding of the material provided for the valve body, which would result in a tight closure of the valve arrangement and would make the bypass arrangement ineffective.
  • hydropneumatic pressure accumulators in the form of bellows accumulators are also known in the prior art.
  • bellows stores mentioned extends within the storage enclosure a seen in the longitudinal direction extendable bellows, which is connected at its one free end regularly with the inside of the storage enclosure and at its other free end usually a plate-like valve closure member, with which the oil fluid port of the storage enclosure closed, but can also be released.
  • a working gas in particular in the form of nitrogen gas, arranged.
  • a representative of the bellows storage solutions is in the EP 1 052 412 A2 shown, wherein protruding on the underside of the plate-shaped valve closing member to the fluid inlet opening of the storage housing, an annular elastomer sealing edge, which has the better stop damping because of individual ring-segment-like projections, but in their total extent in the fluid inlet opening shut-off closed this completely and completely.
  • the initially mentioned advantageous "bypass arrangement" is not achieved with the known bellows storage solution.
  • a generic hydropneumatic pressure accumulator is in the GB 604 731 A demonstrated.
  • the known solution has a valve arrangement which has a valve body acting on a surface portion of the diaphragm which, when approaching a valve seat located at the housing opening, transfers the valve arrangement to the closed position, with a bypass arrangement enabling a limited throughflow through the housing opening in this closed position , which has a spacer on its surface facing the valve seat, which allows the passage relative to the valve seat.
  • the valve body is designed in the form of two disk-shaped plates, which have between them a clamping fit for receiving the membrane surface portion and which are clamped against each other by means of a locking screw. This known clamping seat solution for the membrane builds complicated and as far as the operating behavior is concerned, the known solution leaves nothing to be desired.
  • the invention has the object to provide a pressure accumulator of the type considered available, which is characterized both by a particularly simple design and a particularly good performance.
  • valve body is designed such that it has at one of the valve seat facing surface bounding edge of the plane of this surface slightly projecting edge.
  • At least two projections may be provided on the surface of the valve body facing the valve seat, between which there is a passage enabling the intermediate space.
  • the arrangement may in this case be such that a plurality of projections are arranged distributed on the surface of the valve body in a regular position arrangement.
  • the projections form spacers which support the valve body in a tip-safe manner against the valve seat surface.
  • the projections may be arranged along a concentric circle, which runs a small distance from the peripheral edge of the surface, wherein the projections may be formed by a slotted ring body.
  • the slotted ring body may have four equal partial ring segments, between which there are intermediate spaces with a length which is smaller than half the circumferential length of the partial ring segments. This results in a favorable fürström despite sufficient stability of the spacers serving as projections.
  • the invention also provides a method for producing a hydropneumatic pressure accumulator according to the preamble of claim 1, wherein the method has the method steps and method features specified in claim 9.
  • the membrane 3 separates the housing 1 in its interior into a fluid space 5 and a gas space 7.
  • the housing 1 is, in the viewing direction Fig. 1 seen from an upper housing shell 9 and a lower housing shell 11, each having a circular shell shape with approximately hemispherical curved inner wall.
  • a gas connection 13 At the end of the storage housing 1 opposite the fluid space 5, ie the end associated with the gas space 7, there is a gas connection 13, via which the gas space 7 can be pre-filled with a working gas, in particular N 2 gas.
  • the end associated with the fluid space 5 has a housing opening 15 opening into the fluid space 5, to which an oil connection 17 is attached on the outside, via which the reservoir can be connected to a hydraulic system (not shown).
  • the Fig. 1 shows the diaphragm accumulator in an operating condition in which the diaphragm 3 is in an intermediate position in which there is pressure equilibrium on both sides in the diaphragm 3, because the hydraulic system connected to the oil connection 17 but not shown generates a fluid pressure in the fluid space 5, which is the in the gas space 7 prevailing pressure corresponds.
  • the membrane 3 moves, in viewing direction according to the Fig. 1 , downwards and abuts against the inside of the lower housing shell 11, the membrane 3 covering a valve seat 33 at the edge 31 of the housing opening 15 with a valve body 29 located at its central area.
  • valve body 29 forms part of a valve assembly.
  • the housing opening 15 is closed before the entire volume of oil has leaked 5, so that no oil pockets are formed by remaining residual volumes in the fluid space 5, the valve body 29, as on best that Fig. 2 to 5 can be removed, designed so that a bypass arrangement is formed, which allows a limited flow through the housing opening 15 in the closed position of the valve assembly, so that any residual volume of the oil can flow out of the fluid chamber 5.
  • specially formed projections projecting from the plane of the circular surface 34 are provided on the surface 34 facing the valve seat 33, their special shape being the clearest FIGS. 2 and 3 is removable.
  • the projections which form spacers relative to the valve seat 33, prevent direct contact of the surface 34 of the valve body 29 on the valve seat 33 FIGS. 2 and 3
  • the projections are formed by partial ring segments 37 of a slotted ring body extending along a concentric circle adjacent the rim 39 of the circular valve body 29. Between the partial ring segments 37, which each have the same length, there are in each case intermediate spaces 41, which likewise have the same length, so that the projections are arranged in a regular position arrangement on the surface 34. When in the closed position located valve assembly, as shown in the Fig. 5 1, the intermediate spaces 41 each form fluid paths for a limited throughflow between the fluid space 5 and the housing opening 15.
  • Fig. 2 to 4 can also be removed, have the partial ring segments 37, starting from its base on the surface 34 towards the free end, a tapered shape, which is formed by that on its radially outer side by a coaxial cylindrical surface 43 (see Fig. 2 and 4 ) and bounded on the inside by a conical surface 45, which by a narrow, parallel to the surface 34 of the valve body 29 end surface 47 are connected.
  • the length of the intermediate spaces 41 is less than half the circumferential length of the partial ring segments 37.
  • projections formed by partial ring segments 37 are provided in a regular position arrangement on the surface 34, the intermediate spaces 41 of which form the paths for the flow through. It is understood that spacers of other shape and positional arrangement could be provided, as well as a single, (not shown) one-piece projection, wherein in the latter case openings or recesses in the projection could form the fluid path for the flow through the valve assembly.
  • valve body 29 may be designed so that it has on the surface 34 delimited edge 39 from the plane of the surface 34 slightly projecting edge 51.
  • the use of a valve body 29 with such a peripheral edge 51 allows the production of the pressure accumulator according to a particularly advantageous manufacturing method.
  • Fig. 6 is merely indicated schematically, in the preparation of the membrane 3 with molded therein valve body 29 proceeded so that the provided with the edge 51 valve body 29 is inserted into an injection mold, from the in Fig.
  • a molding 53 is indicated schematically, and then the membrane 3 is formed by injecting an elastomer, wherein the valve body 29 is formed, then the edge 51 forms by abutment against the wall of the molding 53 a sealing edge, which effectively prevents elastomer uncontrolled passes under the surface 34 of the valve body 29.

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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)
  • Vehicle Body Suspensions (AREA)

Claims (9)

  1. Accumulateur de pression hydropneumatique ayant un élément de séparation mobile, qui est disposé dans une enveloppe (1) d'accumulateur, qui sépare un premier espace de travail, de préférence un espace (7) pour du gaz, d'un espace (5) pour du fluide comme deuxième espace de travail, et qui est formé par une membrane (3) en un matériau souple, notamment en un élastomère, dans lequel il se trouve, sur l'enveloppe (1) de l'accumulateur, une ouverture (15) d'enveloppe qui forme un accès à l'espace (5) pour du fluide, et dont le passage peut être commandé par un dispositif de vanne, qui peut passer dans une position de dégagement et dans une position de fermeture et qui possède un obturateur (29) se trouvant sur un segment de surface de la membrane (3) qui, en se rapprochant du siège (33) de vanne se trouvant sur l'ouverture (15) de l'enveloppe, fait passer le dispositif de vanne en la position de fermeture, le dispositif de vanne ayant un agencement de dérivation permettant, en la position de fermeture, un passage limité dans l'ouverture de l'enveloppe, l'obturateur (29) ayant, pour former l'agencement de dérivation sur sa surface (34) tournée vers le siège (33) de vanne, au moins une saillie (37) qui forme par rapport au siège (33) de la vanne, un dispositif de maintien à distance permettant le passage, caractérisé en ce que l'obturateur (29) est conformé de manière à avoir, sur un bord (39) délimitant la surface (34) tournée vers le siège (33) de vanne, une arête (51) légèrement en saillie du plan de cette surface (34).
  2. Accumulateur de pression hydropneumatique suivant la revendication 1, caractérisé en ce qu'il est prévu, sur la surface (34) tournée vers le siège (33) de la vanne de l'obturateur (29), au moins deux saillies (37) entre lesquelles se trouve un espace (41) intermédiaire permettant le passage.
  3. Accumulateur de pression hydropneumatique suivant l'une des revendications précédentes, caractérisé en ce que plusieurs saillies (37) sont disposées d'une manière répartie régulièrement en position sur la surface (34) de l'obturateur (29).
  4. Accumulateur de pression hydropneumatique suivant l'une des revendications précédentes, caractérisé en ce que sa surface (34) de l'obturateur (29) est circulaire et en ce que les saillies (37) sont disposées le long d'un cercle concentrique qui s'étend à une distance petite du bord périphérique de la surface (34).
  5. Accumulateur de pression hydropneumatique suivant l'une des revendications précédentes, caractérisé en ce que les saillies sont formées par une pièce (37) annulaire fendue.
  6. Accumulateur de pression hydropneumatique suivant l'une des revendications précédentes, caractérisé en ce que la pièce annulaire fendue a quatre sous-segments (37) annulaires pareils, entre lesquels il y a des espaces (41) intermédiaires d'une longueur qui est plus petite que la demi-longueur périphérique des sous-segments (37) annulaires.
  7. Accumulateur de pression hydropneumatique suivant l'une des revendications précédentes, caractérisé en ce que les saillies (37) ont un rétrécissement partant de leur base sur la surface (34) de l'obturateur (29) jusqu'à leur extrémité (47) libre.
  8. Accumulateur de pression hydropneumatique suivant l'une des revendications précédentes, caractérisé en ce que les saillies formées par une pièce (37) annulaire fendue, jusqu'au rétrécissement, sont d'un côté, délimitées par une surface (45) conique partant de la surface (34) de l'obturateur (29), et de l'autre côté par une surface (43) cylindrique, ces surfaces étant reliées par une surface (47) d'extrémité étroite, parallèle à la surface (34) de l'obturateur (29).
  9. Procédé de fabrication d'un accumulateur de pression hydropneumatique suivant le préambule de la revendication 1, comprenant les stades :
    a) on se procure un obturateur (29) ayant au moins une saillie (37) se trouvant sur la surface (34) tournée vers le siège (33) de la vanne ;
    b) on introduit l'obturateur (29) dans un moule (53) d'injection pour former une membrane (3) souple formant un élément de séparation mobile, et
    c) on injecte un élastomère formant la membrane (3) de manière à ce que l'obturateur (29) soit incorporé dans l'élastomère en laissant libre la surface (34) tournée vers le siège (33) de la vanne,
    caractérisé en ce qu'on utilise un obturateur (29) qui a sur le bord délimitant la surface (34) une arête (51) en saillie qui forme une étanchéité coopérant avec la paroi du moule (53) d'injection.
EP10750058.9A 2009-10-16 2010-08-26 Accumulateur de pression hydropneumatique Active EP2488762B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910049547 DE102009049547B3 (de) 2009-10-16 2009-10-16 Hydropneumatischer Druckspeicher
PCT/EP2010/005239 WO2011044968A2 (fr) 2009-10-16 2010-08-26 Accumulateur de pression hydropneumatique

Publications (2)

Publication Number Publication Date
EP2488762A2 EP2488762A2 (fr) 2012-08-22
EP2488762B1 true EP2488762B1 (fr) 2016-09-21

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Family Applications (1)

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EP10750058.9A Active EP2488762B1 (fr) 2009-10-16 2010-08-26 Accumulateur de pression hydropneumatique

Country Status (4)

Country Link
EP (1) EP2488762B1 (fr)
JP (1) JP5698247B2 (fr)
DE (1) DE102009049547B3 (fr)
WO (1) WO2011044968A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014010006A1 (de) 2014-07-05 2016-01-07 Hydac Technology Gmbh Hydropneumatischer Druckspeicher
DE102015012357A1 (de) 2015-09-18 2017-03-23 Hydac Technology Gmbh Hydrospeicher
KR101793673B1 (ko) * 2016-06-22 2017-11-03 주식회사 대영특수고무 어큐뮬레이터용 다이어프램
KR101824717B1 (ko) * 2016-10-19 2018-02-02 (주)에버다임 유압 브레이커의 축압기
KR102133256B1 (ko) * 2019-05-10 2020-07-14 주식회사 구영테크 0.1리터 타입 어큐뮬레이터
DE102022129348A1 (de) 2022-11-07 2024-05-08 Hydac Technology Gmbh Verfahren

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB604731A (en) 1945-01-13 1948-07-08 Bendix Aviat Corp Improvements in or relating to hydraulic accumulators
US2604118A (en) 1946-04-25 1952-07-22 Greer Hydraulics Inc Hydraulic accumulator
JPH07224801A (ja) 1994-02-10 1995-08-22 Nok Corp アキュムレータ
EP1052412A2 (fr) 1999-05-12 2000-11-15 NHK Spring Co., Ltd. Accumulateur et son procédé de fabrication
JP2003013902A (ja) 2001-04-27 2003-01-15 Nok Corp アキュムレータ用ブラダおよびその製造方法
DE202007008175U1 (de) 2006-06-16 2007-10-11 Hydac Technology Gmbh Hydropneumatischer Druckspeicher

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08326704A (ja) * 1995-06-05 1996-12-10 Nobuyuki Sugimura アキュムレータ用弁付隔膜
JP2000320501A (ja) * 1999-05-12 2000-11-24 Nhk Spring Co Ltd アキュムレータの自己シール構造
JP2008232367A (ja) * 2007-03-23 2008-10-02 Tokai Rubber Ind Ltd ダイヤフラム型アキュムレータ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB604731A (en) 1945-01-13 1948-07-08 Bendix Aviat Corp Improvements in or relating to hydraulic accumulators
US2604118A (en) 1946-04-25 1952-07-22 Greer Hydraulics Inc Hydraulic accumulator
JPH07224801A (ja) 1994-02-10 1995-08-22 Nok Corp アキュムレータ
EP1052412A2 (fr) 1999-05-12 2000-11-15 NHK Spring Co., Ltd. Accumulateur et son procédé de fabrication
JP2003013902A (ja) 2001-04-27 2003-01-15 Nok Corp アキュムレータ用ブラダおよびその製造方法
DE202007008175U1 (de) 2006-06-16 2007-10-11 Hydac Technology Gmbh Hydropneumatischer Druckspeicher

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
INTEGRAL ACCUMULATOR GMBH & CO. KG: "Hydrospeicher /Hydraulic accumulator/ D0,24-40", ZEICHNUNG /DRAWING/ E024-1515-023-341, 21 July 2009 (2009-07-21), pages 1, XP055393709
INTEGRAL ACCUMULATOR GMBH & CO. KG: "Membrane", ZEICHNUNG /DRAWING/ 024-1115-023-482, 11 July 2006 (2006-07-11), pages 1, XP055393712
INTEGRAL ACCUMULATOR GMBH & CO. KG: "Membranteller", ZEICHNUNG 024-1015-024-046, 12 July 2006 (2006-07-12), pages 1, XP055393719

Also Published As

Publication number Publication date
WO2011044968A3 (fr) 2013-04-11
WO2011044968A2 (fr) 2011-04-21
DE102009049547B3 (de) 2011-02-17
EP2488762A2 (fr) 2012-08-22
JP5698247B2 (ja) 2015-04-08
JP2013507591A (ja) 2013-03-04

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