EP0902193B1 - Kolbenspeicher mit Tiefenfiltrationsdichtung - Google Patents

Kolbenspeicher mit Tiefenfiltrationsdichtung Download PDF

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Publication number
EP0902193B1
EP0902193B1 EP98113168A EP98113168A EP0902193B1 EP 0902193 B1 EP0902193 B1 EP 0902193B1 EP 98113168 A EP98113168 A EP 98113168A EP 98113168 A EP98113168 A EP 98113168A EP 0902193 B1 EP0902193 B1 EP 0902193B1
Authority
EP
European Patent Office
Prior art keywords
piston
separating
accumulator
sealing
sealing device
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
EP98113168A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0902193A2 (de
EP0902193A3 (de
Inventor
Helmfried Kany
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
Application filed by Hydac Technology GmbH filed Critical Hydac Technology GmbH
Publication of EP0902193A2 publication Critical patent/EP0902193A2/de
Publication of EP0902193A3 publication Critical patent/EP0902193A3/de
Application granted granted Critical
Publication of EP0902193B1 publication Critical patent/EP0902193B1/de
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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • 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
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/21—Accumulator cushioning means using springs
    • 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
    • F15B2201/41—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

Definitions

  • the invention relates to a piston accumulator with an inside a accumulator housing longitudinally movable separating piston, which is a fluid side of the accumulator sealingly separates its gas side via a sealing device, being on the gas side of the memory, a second separating piston is arranged and one between Provide the two separating pistons with a sealant is that is biased under the action of the two separating pistons, the can be moved towards one another via an energy store.
  • piston accumulators DE 41 41 929 A1 Types known. These are the essential components of a piston accumulator outer cylinder tube forming the accumulator housing, which is why the piston accumulator are also designated with cylinder memory, the separating piston with the sealing system in the form of sealing rings attached to its outer circumference and the front-side closure cover, which also the liquid or gas connection include.
  • the storage case comes essentially two Tasks too; on the one hand it serves to absorb the internal pressure and on the other other it causes the separation piston to guide the separating element between Represents gas and fluid side.
  • a piston pressure accumulator is known with a piston, that separates a gas space from a liquid space.
  • the piston is through Prestressed compression springs in the gas space. Is on its outer circumference a combination of seals arranged that ensure that no gas from penetrate the gas space into the liquid space along the outside of the piston can. This increases the service life of the known piston pressure accumulator.
  • the piston pressure accumulator which has only one separating piston, has on the outer circumference of its piston between two outer sealing rings two elongated Seals made of open-pored, soft material, the the annular space facing the liquid space and receiving the open-pore seal via a channel in the piston with a smaller flow cross-section is connected to the liquid space.
  • the one between the usual sealing rings mentioned addressed elongated open-pore seals that also consist of felt or an open-pore rubber-elastic material can have depth filtration properties so that dirt can be filtered out of the fluid.
  • the effect is, however limited due to the other sealing devices acting outwards usual type, and especially for coarse soiling, for example in the form of metal particles, the usual external sealing device be damaged before the further sealant with depth filtration properties filtering out the metal particles. In this case the entire sealing device is then already damaged and at a loss the sealing effect, especially when the known piston pressure accumulator is in operation for a long time, is to be expected.
  • DE-OS 20 19 407 is a generic hydropneumatic energy store known with separating pistons, with another separating piston or the one Half of the separating piston mentioned via an energy accumulator in the form of a plate spring is pressed towards the other half of the separating piston.
  • An between the sealant halves arranged in the form of an elastomer seal is pressed together in this way and thus allows an improved Sealing. Otherwise, the between pressure builds up in the halves of the separating piston towards the fluid side drained.
  • the known memory only has conventional sealing devices, for example in the form of a compressible elastomer seal especially in the case of coarse soiling to failure of the same and hence the memory.
  • the compressible over the halves of the separating piston Sealing device which should lead to an improved sealing effect, is the Sealing effect from the gas to the fluid side of the reservoir, especially when reinforced occurring and coarse dirt, not enough.
  • the invention is based on the object to create a piston accumulator that even under extreme conditions long operating times and when contamination occurs in the operating medium maintains its tightness and ensures that gas is not used in any operating state Fluid side can escape.
  • a piston accumulator solves this task with the features of claim 1.
  • Sealing device has a separating agent with depth filtration property that the Release agent with the depth filtration property as part of the sealing device Fluid side is arranged last and the other parts of the sealing device in Direction of the gas side are arranged on the outer circumference side of the separating piston, and is that the sealant consists of a highly viscous sealing medium guaranteed by means of a separating agent with deep filtration properties, that contamination occurring, in particular in the form of metal particles, filtered out of the fluid in front of the actual sealing devices are, so that the seals are no longer affected by this Depth filter cleaned fluid without affecting the gas side of the Can seal memory.
  • the dirt holding capacity of the filter medium is not exhausted, since the oil between the depth filter and the elastomer seal reached, is not replaced.
  • the filter has a long-term effect.
  • the highly viscous sealing medium arranged between the two separating pistons is biased under the action of the two separating pistons, which over a Energy stores are movable towards each other, is a kind of variable two-part Separating flask given an intermediate gas barrier, the prevents the small gas molecules from not relaxing through the oil side otherwise tight sealing system in the form of the outer circumference Sealing rings of the two pistons can creep, which in the long term will ensure functional reliability of the piston accumulator would impair.
  • a piston accumulator is known with a rigid two-part Separating piston assembly that separates the gas side from the fluid side of the accumulator separates and between them delimits a space that is radial channel running through the wall of the storage housing to the surrounding atmosphere leads. Regardless of the position of the separating pistons within the Storage space, the space across the channel with the atmosphere is permanent connected. With pressure changes in the surrounding atmosphere and / or temperature changes and possibly leakage of gas from the gas space along a first sealing arrangement on one of the two separating pistons in the space, there is a pressure equalization through the channel, so that Inhibitions in the operation of the known piston accumulator are avoided. To the Avoiding entry of dirt and / or water becomes a section of the matter Channel designed helically, in which respect extended duct bore an element formed from ductile material is, which then results in the helical channel section.
  • a gas loss on the gas side of the store is therefore excluded compared to the known solution, as long as the sealing medium in the space between the two Separating piston and pre-tensioned is present, the actual Seals from damage by the sealant with the depth filtration property are protected and thus such an effective overall sealing system is realized that meets all requirements. Otherwise, can be on polluting Channel openings in the storage housing can be dispensed with.
  • the release agent from a felt in particular in the form of at least one felt ring.
  • felt stands for a compressed scrim with random Arrangement of fibers, especially natural and chemical fibers. It can be both Needle felt as well as full felt are used, in which the initial cotton wool similar fiber layer is tangled with barbs using felting needles or in the nonwoven fabric by pressure and movement under heat and moisture be solidified.
  • Woven felt materials can also be used woven, milled and matted fabrics.
  • the felt material chosen such that good filtration and in particular depth filtration property as stated above.
  • the release agent provides the Basically a kind of filtration medium.
  • the single figure partially shows a basic and not to scale representation a longitudinal section through the piston accumulator.
  • the piston accumulator has a longitudinally displaceable inside a accumulator housing 10 first separating piston 12, which has a fluid side or oil side 14 from a Gas side 16 separates.
  • the storage housing 10 is cylindrical, wherein the end caps with the gas or liquid connection are omitted for simplicity of illustration in the figure.
  • the gas side 16 is generally filled with nitrogen as the working gas and hydraulic oil is stored on the fluid side 14. So between those two pressure rooms addressed a pressure level as balanced as possible there is basically a requirement that the friction between the as Whole with 18 designated sealing device and the inner wall of the storage housing 10 is very small during the piston movement. This is why usually the surface on the inside of the cylinder barrel that houses the storage case 10 forms, finely machined.
  • the conventional sealing system of the accumulator consists of the usual ring or O-ring seals 20 in the outer circumferential grooves 22 on the outer circumferential side are embedded in the separating piston 12. Furthermore, the sealing device has 18 a separating agent 24 with depth filtration property, which is also in an outer circumferential groove 22 of the separating piston 12 is received.
  • the release agent 24 consists of a felt, in particular in the form of a felt ring.
  • the separating agent 24 has the depth filtration property as part of the sealing device 18 to the fluid side 14 arranged last and the others already mentioned parts of the sealing device 18 in the form of the ring seals 20 are in the direction of the gas side 16 and away from the fluid side 14 on the outer peripheral side arranged on the separating piston 12.
  • a guide belt 26 is arranged in a conventional design, which is not shown for the sake of simplicity, but also from an outer circumferential groove 22 of the separating piston 12 is received.
  • the separating piston 12 is in the manner of a cylindrical piston with a central cylindrical one Inner recess 28 formed, which opens to the gas side 16 and one Represents part of the same ..
  • Second separating piston 30 in addition to the first separating piston 12 arranged, one arranged between these two separating pistons 12,30 Intermediate space 32 can be filled with a sealing medium.
  • the sealing medium which is usually a highly viscous oil, is under the influence of the two separating pistons 12, 30, which are preloaded via an energy accumulator 34 are kept movable towards each other.
  • the two separating pistons 12, 30 are from passed through a connecting rod 36 and as a force accumulator 34 is a compression spring provided that has one end at the bottom 38 within the inner recess 28 of the first separating piston 12 is supported and with the other end the compression spring is supported on a fixed annular holding plate 40 on upper free end of the connecting rod 36.
  • the sealing medium can also consist of a separation gas or a working fluid, as it is on the Fluid side 14 is used.
  • the two have Separating pistons 12, 30 each have an annular groove 42 which does not accommodate two sealing rings shown serve to space 32 relative to the Seal the fluid side 14 and the gas side 16 in the interior.
  • the connecting rod 36 is, as far as it reaches through the compression spring, with this in the inner recess 28 of the first separating piston 12 guided in the middle.
  • the first Separating piston 12 opposite end of the connecting rod 28 is in contrast firmly connected to the second separating piston 30.
  • the supply line 44 is at the bottom 38 of the inner recess 28 of the first separating piston 12 a longitudinal channel arranged parallel to the longitudinal axis of the connecting rod 36 runs.
  • the feed line 44 points in the area of the bottom 38 on a grease nipple 46, via which and via the feed line 44 the highly viscous sealing medium can be pressed into the intermediate space 32.
  • the injection pressure is chosen such that the resulting in the space 32 Oil pressure caused by the preload of the braced against each other Separating piston 12.30 is higher than an achievable in the operation of this piston accumulator Pressure on the gas side 16 or the fluid side 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Sealing Devices (AREA)
  • Fluid-Pressure Circuits (AREA)
EP98113168A 1997-09-12 1998-07-15 Kolbenspeicher mit Tiefenfiltrationsdichtung Expired - Lifetime EP0902193B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19740150 1997-09-12
DE19740150A DE19740150A1 (de) 1997-09-12 1997-09-12 Kolbenspeicher mit Tiefenfiltrationsdichtung

Publications (3)

Publication Number Publication Date
EP0902193A2 EP0902193A2 (de) 1999-03-17
EP0902193A3 EP0902193A3 (de) 1999-07-07
EP0902193B1 true EP0902193B1 (de) 2003-10-29

Family

ID=7842159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98113168A Expired - Lifetime EP0902193B1 (de) 1997-09-12 1998-07-15 Kolbenspeicher mit Tiefenfiltrationsdichtung

Country Status (6)

Country Link
EP (1) EP0902193B1 (da)
AT (1) ATE253177T1 (da)
DE (2) DE19740150A1 (da)
DK (1) DK0902193T3 (da)
ES (1) ES2210626T3 (da)
NO (1) NO320760B1 (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103511402A (zh) * 2012-06-18 2014-01-15 中国航空工业集团公司西安飞机设计研究所 一种防止液压锁闭的方法及其专用压力平衡器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10052665B4 (de) * 2000-10-24 2007-02-01 Zf Sachs Ag Kolbenspeicher für eine Druckmittel-Betätigungsvorrichtung
DE10111332B4 (de) * 2001-03-08 2004-08-19 Carl Freudenberg Kg Kolbenspeicher
DE10209663C1 (de) * 2002-03-05 2003-07-31 Hydac Technology Gmbh Druckspeicher
DE10242104A1 (de) * 2002-03-06 2003-09-18 Continental Teves Ag & Co Ohg Kolbenspeicher
RU2252148C1 (ru) * 2003-12-05 2005-05-20 Федеральное государственное образовательное учреждение высшего профессионального образования "Азово-Черноморская государственная агроинженерная академия" (ФГОУ ВПО АЧГАА) Устройство для снижения жесткости трансмиссии машинотракторных агрегатов

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2019407B2 (de) * 1970-04-22 1975-07-10 Hydrotechnik Gmbh, 6051 Laemmerspiel Trennkolben fuer hydropneumatische Energiespeicher
CH591020A5 (en) * 1975-08-15 1977-08-31 Gfeller Hans High pressure storage reservoir - has separator of two longitudinally displaceable pistons
SE447296B (sv) * 1985-11-25 1986-11-03 Stromsholmens Mek Verkstad Avstrykaranordning vid cylinder och axiellt rorlig kolv
DE3619990A1 (de) * 1986-06-13 1987-12-17 Bosch Gmbh Robert Kolbendruckspeicher
SE459275B (sv) * 1987-10-23 1989-06-19 Volvo Flygmotor Ab Anordning foer oskadliggoerande av metallspaanor i en tryckvaetskeackumulator
DE4141929A1 (de) * 1991-12-19 1993-06-24 Bosch Gmbh Robert Kolbenspeicher

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103511402A (zh) * 2012-06-18 2014-01-15 中国航空工业集团公司西安飞机设计研究所 一种防止液压锁闭的方法及其专用压力平衡器

Also Published As

Publication number Publication date
NO984186D0 (no) 1998-09-11
ATE253177T1 (de) 2003-11-15
DE59810011D1 (de) 2003-12-04
NO320760B1 (no) 2006-01-23
DE19740150A1 (de) 1999-03-25
DK0902193T3 (da) 2004-02-23
ES2210626T3 (es) 2004-07-01
NO984186L (no) 1999-03-15
EP0902193A2 (de) 1999-03-17
EP0902193A3 (de) 1999-07-07

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