EP0078031A1 - Accumulateur de pression - Google Patents

Accumulateur de pression Download PDF

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Publication number
EP0078031A1
EP0078031A1 EP82109758A EP82109758A EP0078031A1 EP 0078031 A1 EP0078031 A1 EP 0078031A1 EP 82109758 A EP82109758 A EP 82109758A EP 82109758 A EP82109758 A EP 82109758A EP 0078031 A1 EP0078031 A1 EP 0078031A1
Authority
EP
European Patent Office
Prior art keywords
piston
chamber
recess
piston head
cylinder
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.)
Granted
Application number
EP82109758A
Other languages
German (de)
English (en)
Other versions
EP0078031B1 (fr
Inventor
Douglas Millard Gage
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
Publication of EP0078031A1 publication Critical patent/EP0078031A1/fr
Application granted granted Critical
Publication of EP0078031B1 publication Critical patent/EP0078031B1/fr
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
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • 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
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings
    • 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
    • F15B2201/32—Accumulator separating means having multiple separating means, e.g. with an auxiliary piston sliding within a main piston, multiple membranes or combinations thereof
    • 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

Definitions

  • the invention relates to a cylinder-piston arrangement in which, in a housing forming the cylinder, a displaceable piston arrangement, two cylinder chamber sections, one of which contains a pressure fluid, seals against one another by means of seals slidingly engaging on the cylinder wall.
  • a cylinder-piston arrangement is particularly suitable for use as a pressure accumulator.
  • a pressure accumulator has two main functions when used as part of a hydraulic circuit.
  • the first function is to hold a predetermined supply of hydraulic fluid under pressure so that it can be supplied to the hydraulic circuit should the fluid under pressure be needed in an emergency.
  • the second main function of an accumulator is to absorb pressure peaks in the hydraulic system.
  • An accumulator generally consists of a housing that forms a cylinder that is closed at each end.
  • a piston is slidably guided in the cylinder, which divides the cylinder into a first and a second chamber.
  • the first chamber contains a pressurized gas while the second chamber contains the hydraulic fluid reservoir under system pressure. Should the system pressure drop unexpectedly for any reason, the pressurized gas drives the piston, which carries the hydraulic fluid from the second chamber into the system feeds so that it is available there for emergency operations. When the system pressure returns, the second chamber receives a corresponding amount of hydraulic fluid against the pre-pressure of the gas.
  • the cylinder-piston arrangement be particularly suitable to be used as an accumulator.
  • the piston arrangement itself consists of several, preferably two, pistons which are independent of one another, and two pistons each contain an incompressible barrier fluid. Any number of pistons can be arranged, the incompressible barrier fluid being arranged between every two pistons. As a rule, however, two such pistons are sufficient.
  • the pistons are preferably floating and displaceably arranged piston heads, which seal the intermediate space receiving the incompressible barrier fluid from the respectively adjacent cylinder chamber sections. Due to the enclosed and pressurized incompressible barrier liquid, a fluid seal is obtained between the two main or working chambers of the cylinder or accumulator.
  • Each piston head can have an endless recess on its circumference, which is open towards the cylinder wall.
  • Each of these recesses can receive a fluid, specifically through an opening in the associated piston head, so as to obtain a further sealing ability. It was found that the new cylinder-piston arrangement creates a pressure equalization over the piston head, which prevents any creeping out or leakage of the pressurized fluid or gas from the first working chamber into the second working chamber, even under difficult conditions.
  • FIG. 1 A conventional accumulator is shown in FIG. 1, which has a housing 11. In this a cylindrical chamber 12 is formed, which is closed at both ends by end caps 27 and 29. In the chamber 12, a piston 13 is slidably mounted. The piston contains an annular recess 15 and an opening 17 which leads from the recess to the rear end face of the piston. Sealing devices are provided between the piston 13 and the wall of the cylindrical chamber 12. For this purpose, annular seal packs 19 and 21 are used, which are arranged on both sides of the recess 15. The piston 13 divides the chamber 12 into two working chamber sections 23 and 25.
  • the end cap or end cap 27 has an oil connection opening 39 through which hydraulic fluid can get into the chamber 25 and from there into the hydraulic system.
  • the closure cap 29 at the other end has a compressed gas valve 49 through which compressed gas can be introduced into the chamber 23.
  • the conventional accumulator of Fig. 1 shows a tendency to lose its gas pressure over time, under certain extreme conditions.
  • a possible reason for the loss of gas pressure can be caused by the total amount of hydraulic supply being expelled from the second chamber 25, so that the piston 15 comes into contact with the closure cap 27. This creates a pressure imbalance across the seal packs 19 and 21. This can lead to a loss of gas under pressure in the recess 15, with the result that the biasing pressure of the gas decreases.
  • Another possibility can occur if the accumulator is used under extremely low temperatures. This reduces the flexibility of the seal packs 19 and 21, so that the seal loses its effect and gas can leak into the recess 25.
  • FIG. 2 This shows a new type of accumulator.
  • the accumulator comprises a housing 50 which delimits a cylindrical chamber 51.
  • a piston arrangement 52 consists of two freely floating piston heads 52a and 52b. These are slidably arranged in the cylinder chamber 51.
  • the pistons 52a and 52b each have endless recesses 54 and 64 which are open on their circumference towards the cylinder wall.
  • the pistons also have corresponding openings 56 and 66. These extend rearward from the respective recesses 54 and 64.
  • a first stack of gasket 58 lies in front of the endless recess 54 and comprises a packing ring which is supported between two support rings.
  • a second seal stack 60 comprises a packing ring, behind which a support ring lies.
  • This seal pack is arranged behind the recess 54.
  • Another stack of sealing rings 68 lies in front of the endless recess 64 in the piston head 52b.
  • a sealing ring stack 70 lies behind the recess 54.
  • the sealing ring stacks 68 and 70 are each designed to match the sealing ring stacks 58 and 60.
  • the piston heads 52a and 52b divide the accumulator into a first chamber section 72 for receiving the gas under pressure and a second chamber section 74, in which the hydraulic fluid is received. Between the piston heads 52a and 52b, which are spaced from one another, a generally incompressible fluid of relatively high density is enclosed, including the cylinder wall. The trapped fluid completely occupies the space between the piston heads 52a and 52b so that the piston heads 52a and 52b make a synchronous or common movement. One can therefore speak of the piston heads 52a and 52b and the enclosed incompressible fluid move in the longitudinal direction of the cylinder chamber 51 as a unit. The ends of the housing 50 are sealed by caps 80 and 82.
  • the closure cap 80 is firmly and sealingly attached to the housing 50 by appropriate measures, for example by a weld 90, in order to enclose the chamber section 72.
  • the closure cap 80 has a conventional gas valve 92 through which the bias gas can be introduced into the chamber section 72.
  • the closure cap 82 is fixedly and sealingly mounted on the housing 52 with the aid of a snap ring 86 in the usual way.
  • a sealing ring stack 84 which corresponds to the sealing ring stack 58, lies in front of the snap ring 86.
  • An opening or bore 88 extends through the closure cap 82 in order to introduce the hydraulic fluid into the chamber section 74 or to lead it out of this into the hydraulic system.
  • the piston head 52b has a filling opening in the end face 76, which is subsequently closed pressure-tight and tightly by a stopper 78.

Landscapes

  • 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)
EP82109758A 1981-10-26 1982-10-22 Accumulateur de pression Expired EP0078031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31481281A 1981-10-26 1981-10-26
US314812 1989-02-22

Publications (2)

Publication Number Publication Date
EP0078031A1 true EP0078031A1 (fr) 1983-05-04
EP0078031B1 EP0078031B1 (fr) 1986-07-09

Family

ID=23221553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109758A Expired EP0078031B1 (fr) 1981-10-26 1982-10-22 Accumulateur de pression

Country Status (5)

Country Link
EP (1) EP0078031B1 (fr)
JP (1) JPS5881202A (fr)
CA (1) CA1180979A (fr)
DE (1) DE3271950D1 (fr)
ES (1) ES516793A0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854296A2 (fr) 1997-01-16 1998-07-22 Hydac Technology Gmbh Accumulateur à piston avec dispositif d'étanchéité
WO2004003392A1 (fr) * 2002-06-27 2004-01-08 Hydac Technology Gmbh Accumulateur hydraulique
WO2007030017A1 (fr) * 2005-07-18 2007-03-15 Siem Wis As Accumulateur de pression disposant d'une puissance suffisante pour manipuler et actionner un équipement externe et son utilisation
EP2012020A3 (fr) * 2007-07-06 2011-04-06 AGCO GmbH Accumulateur de piston

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10207181A1 (de) * 2001-11-05 2003-05-15 Continental Teves Ag & Co Ohg Kolbenspeicher
CN102536928B (zh) * 2011-12-26 2014-08-13 辽宁东工装备制造有限公司 一种气液三室液压系统过压缓冲平衡装置
DE102024002296A1 (de) * 2024-07-15 2026-01-15 Hydac Technology Gmbh Hydrospeicher

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683467A (en) * 1952-05-23 1954-07-13 Greer Hydraulies Inc Piston accumulator
US2754847A (en) * 1951-07-20 1956-07-17 Electrol Inc Piston-type accumulators
GB956572A (en) * 1960-01-30 1964-04-29 Heinz Teves Sealing means for pistons and piston-rods of hydraulic cylinders
DE1450347A1 (de) * 1964-10-22 1969-03-13 Baumgarten Hydrotech Abdichtung fuer Kolben von hydraulischen oder pneumatischen Zylindern
CH591020A5 (en) * 1975-08-15 1977-08-31 Gfeller Hans High pressure storage reservoir - has separator of two longitudinally displaceable pistons

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186777A (en) * 1978-10-27 1980-02-05 Deere & Company Pressure vessel retained energy measurement system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754847A (en) * 1951-07-20 1956-07-17 Electrol Inc Piston-type accumulators
US2683467A (en) * 1952-05-23 1954-07-13 Greer Hydraulies Inc Piston accumulator
GB956572A (en) * 1960-01-30 1964-04-29 Heinz Teves Sealing means for pistons and piston-rods of hydraulic cylinders
DE1450347A1 (de) * 1964-10-22 1969-03-13 Baumgarten Hydrotech Abdichtung fuer Kolben von hydraulischen oder pneumatischen Zylindern
CH591020A5 (en) * 1975-08-15 1977-08-31 Gfeller Hans High pressure storage reservoir - has separator of two longitudinally displaceable pistons

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0854296A2 (fr) 1997-01-16 1998-07-22 Hydac Technology Gmbh Accumulateur à piston avec dispositif d'étanchéité
EP0854296A3 (fr) * 1997-01-16 1999-07-07 Hydac Technology Gmbh Accumulateur à piston avec dispositif d'étanchéité
WO2004003392A1 (fr) * 2002-06-27 2004-01-08 Hydac Technology Gmbh Accumulateur hydraulique
US7066208B2 (en) 2002-06-27 2006-06-27 Hydac Technology Gmbh Hydraulic accumulator
WO2007030017A1 (fr) * 2005-07-18 2007-03-15 Siem Wis As Accumulateur de pression disposant d'une puissance suffisante pour manipuler et actionner un équipement externe et son utilisation
EA010819B1 (ru) * 2005-07-18 2008-12-30 Сиэм Вис Ас Аккумулятор давления для создания мощности, достаточной для приведения в действие и функционирования внешнего оборудования, а также его применение
AU2006288011B2 (en) * 2005-07-18 2010-07-15 Siem Wis As Pressure accumulator to establish sufficient power to handle and operate external equipment, and use thereof
US8474253B2 (en) 2005-07-18 2013-07-02 Siem Wis As Pressure accumulator to establish sufficient power to handle and operate external equipment and use thereof
EP2012020A3 (fr) * 2007-07-06 2011-04-06 AGCO GmbH Accumulateur de piston

Also Published As

Publication number Publication date
ES8400553A1 (es) 1983-10-16
JPS5881202A (ja) 1983-05-16
DE3271950D1 (en) 1986-08-14
ES516793A0 (es) 1983-10-16
EP0078031B1 (fr) 1986-07-09
CA1180979A (fr) 1985-01-15

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