EP1342922B1 - Druckspeicher - Google Patents

Druckspeicher Download PDF

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Publication number
EP1342922B1
EP1342922B1 EP03001475A EP03001475A EP1342922B1 EP 1342922 B1 EP1342922 B1 EP 1342922B1 EP 03001475 A EP03001475 A EP 03001475A EP 03001475 A EP03001475 A EP 03001475A EP 1342922 B1 EP1342922 B1 EP 1342922B1
Authority
EP
European Patent Office
Prior art keywords
piston
pressure
main piston
main
sealing medium
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
EP03001475A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1342922A3 (de
EP1342922A2 (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 EP1342922A2 publication Critical patent/EP1342922A2/de
Publication of EP1342922A3 publication Critical patent/EP1342922A3/de
Application granted granted Critical
Publication of EP1342922B1 publication Critical patent/EP1342922B1/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
    • 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
    • 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
    • F15B2201/41—Liquid ports
    • F15B2201/413—Liquid ports having multiple 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 pressure accumulator with a longitudinally displaceable within a storage housing, from main piston and relative to this movable auxiliary piston piston assembly which sealingly separates a fluid side of the memory from its gas side via a sealing device, which latter a release agent with depth filtration properties, other sealing elements and has a chamber adjacent to the inner wall of the storage housing for a flowable sealing medium, which is biased by the auxiliary piston, which is acted upon for a volume of the chamber reducing relative movement with the pressure of the gas side and the force of an energy accumulator.
  • a pressure accumulator is known with a cylinder tube as a storage enclosure, being as a separating member between a working gas located on one side and the located on the opposite side of the storage housing working fluid, preferably in the form of hydraulic oil, two pistons are longitudinally displaceably guided.
  • the one piston in the manner of a main piston has an inner bore and the other second piston in the manner of an auxiliary piston with a diameter corresponding to the diameter of this inner bore part in the same feasible and with another part on the cylinder wall of the storage housing.
  • a sealing medium which has a much higher viscosity than the working medium and preferably consists of fat.
  • the sealing medium enclosed between the double piston arrangement is biased in order to achieve such an increased seal from the gas to the fluid side of the pressure accumulator.
  • the known accumulator solution builds large in the axial direction, because the two pistons must have a greater length so that they do not tilt in the cylinder tube and od an additional guidance by a piston rod. Like. Is not provided.
  • An additionally formed on the inner wall of the storage enclosure pressure pad of a flowable sealing medium reduces the risk of gas losses, especially during downtime, where there is no operating pressure on the fluid side.
  • the known solution comprises a main and an auxiliary piston, which are arranged in the storage housing at an axial distance from each other, so that a gap in the form of an adjacent to the inner wall of the storage chamber chamber is formed, which is filled with a sealing medium.
  • An attached to the auxiliary piston connecting rod passes through the main piston and is guided in this displaceable.
  • a clamped between the main piston and an end stop of the connecting rod spring serves as a force storage, the auxiliary piston and the main piston to reduce the volume of the space located between them seeks to approach each other.
  • the structure of the piston assembly of separate pistons with guide of the auxiliary piston on a displaceable in the main piston connecting rod on the one hand represents a complex construction and is on the other hand with regard to the reliability little satisfactory.
  • the reliability is at risk because of the close fit of the leadership of the connecting rod of the separate piston even slight deformations can lead to jamming.
  • the movable with the main piston along the inner wall of the storage housing auxiliary piston is subject to the same Verschl constitubeiastung as the main piston.
  • the formation of the piston assembly with two separate piston with connecting rod guide a construction that is neither inexpensive to produce nor easy to install.
  • the known accumulator solution has no release agent with depth filtration property and the rest of the auxiliary piston is held in the main piston exclusively by a snap ring, which reduces the sealing effect accordingly, to which also contributes that both the guide for the auxiliary piston in the main piston and the auxiliary piston itself the fluid side facing and thus have to seal a high fluid pressure during storage operation.
  • the invention has the object to provide a pressure accumulator, which, although it is simple and inexpensive to produce, has improved performance, especially long-term behavior, even under very severe conditions.
  • this object is achieved in that the auxiliary piston is fully integrated in an open to the gas side guide of the main piston and that in this means of the auxiliary piston, a space can be enclosed, which forms part of the flowable sealing medium receiving chamber ,
  • auxiliary piston within the main piston allows a particularly cost-effective production and easy installation. Problems with fits, as they occur with separate piston and their leadership via a connecting rod are avoided.
  • provided for guiding the auxiliary piston within the main piston results in a special robustness against mechanical loads, so that the pressure accumulator according to the invention for special applications, for example for defense applications, is particularly suitable, for example for use in battle tanks.
  • the release agent with the depth filtration property which forms part of the sealing device, arranged on the piston assembly to the fluid side last, so that from the fluid side to the other sealing elements towards migrating liquid, for example, contaminated by metal particles hydraulic fluid undergoes depth filtering, so that a Danger to the axially subsequent, further sealing elements is avoided.
  • a release agent is preferably a felt, in particular in the form of at least one felt ring, use.
  • Felt here in the context of the invention for a compacted scrim with random arrangement of fibers, especially natural and man-made fibers. It can be used both needle felting and felting, in which the initial lap similar fiber layer is entangled by means of felted needles barbs or are solidified in the fiber webs by pressure and movement under heat and moisture.
  • woven felt materials can be used made of woven, gewalkten and matted fabrics.
  • the use of felt materials of relatively high density, such as materials with density values in the range of 0.36 g / cm 3 , corresponding to hardness group F 2 according to DIN 61200, has proven favorable. It is understood that, depending on the nature, type of contamination and degree of liquid side fluid any suitable filtration materials other density and / or hardness groups can be selected.
  • Fig. 1 shows the fluid-side portion of the storage case of the embodiment of the accumulator according to the invention, with a cylinder tube 1 and the fluid-side conclusion forming cylinder cover 3.
  • the latter is fixed at the end of the cylinder tube 1 by means of a split retaining ring 5, which in turn is secured by an annular disc 7 , which is bolted to the cylinder cover 3 by means of three screws 9 of which in Fig. 1, only one is visible.
  • the cylinder cover 3 has a bore 12 concentric with the cylinder axis 11 for the connection of a fluid line.
  • the gas-side end (not shown) of the cylinder tube 3 is closed by a cylinder cover, which has corresponding fittings, such as a gas filling valve, in the manner customary for such pressure accumulators.
  • a gasket is also provided on the cylinder cover, not shown, on the gas side end of the cylinder tube 1.
  • a piston assembly along the axis 11 is guided longitudinally displaceable.
  • This piston assembly which is shown separately in Fig. 2 and designated as a whole by 15, is formed of a main piston 17 and an auxiliary piston 19, which latter is movably guided in a guide 21 which extends concentrically in the main piston 17 to the axis 11 and to the right in Fig. 1 located gas side 23 is open.
  • the piston assembly 15 formed from the main piston 17 and auxiliary piston 19 separates within the cylinder tube 1, the gas side designated by 23 of the in Fig. 1 with 25 designated fluid side, which is in communication with the fluid port 12.
  • the guide 21 of the main piston 17 is limited by an annular body 27 which is axially secured by a Segerring 29.
  • the auxiliary piston 19 located in the guide 21 of the main piston 17 is secured against the exit from the guide 21 by contact with the annular body 27.
  • Fig. 1 shows the piston position of the auxiliary piston 19, in which this rests on the annular body 27.
  • the auxiliary piston 19 is designed trough-shaped, wherein in the concentric with the longitudinal axis 11 interior 31 a helical compression spring 33 is seated, which is supported on the one hand at the bottom of the interior 31 and on the other hand on the annular body 27.
  • the reduction the volume of the space 35 corresponds, which is located between the auxiliary piston 19 and the closed end of the guide 21 in the main piston 17.
  • the space 35 which is explained in more detail below, is provided for receiving a flowable sealing medium forms part of a chamber which adjoins the inner wall of the cylinder tube 1 to form a pressure pad applied to this inner wall of the sealing medium.
  • the space 35 is connected via a plurality of connecting channels 37 with a recess 39 incorporated in the circumference of the main piston 17, which extends annularly over the entire circumference of the main piston 17.
  • the axis 41 of the connecting channels 37 extends obliquely to the main longitudinal axis 11.
  • the bottom of the recess 39 has over its axial extent to a different depth. More specifically, the bottom of the recess 39 has contiguous planar and concave bottom surface portions 38 and 40, respectively, with the junction of the connection channels 37 located in the recess 39 in a flat bottom surface portion 38 whose plane is perpendicular to the axis 41 of the connection channels 37 ,
  • the sealing means effecting the separation between the gas side 23 and the fluid side 35 is entirely formed on the circumference of the main piston 17.
  • the sealing device has a release agent with depth filtration properties, namely in the embodiment a felt ring 43 which sits in the region of the end of the inner guide 21 forming piston crown 45 in an annular groove of the main piston 17.
  • a piston seal 47 of the type commonly used in pressure accumulators is provided, for example, an elastomeric seal.
  • Axially further offset to the gas side 23 is located after the recess 39 a further piston seal 47.
  • a piston guide rail 49 is provided at the gas-side end region of the main piston 17.
  • a filling channel 51 Centrally located in the piston head 45 is a filling channel 51 for introducing the sealing medium into the space 35, which forms the chamber for the voltage applied to the inner wall of the cylinder tube 1 pressure pad of the sealing medium via the connecting channels 37 together with the recess 39.
  • a check valve 53 In the filling channel 51 is a check valve 53.
  • a closable vent hole 55 is provided in the piston head 45.
  • the auxiliary piston 19 is sealed relative to the guide 21 in the main piston 17 by means of a sealing ring 57.
  • a sealing element of simple design can be used here, because the seal to be formed is not exposed to great loads during operation, especially since during operation virtually no displacement movement of the auxiliary piston 19 takes place.
  • Fig. 2 shows the piston assembly 15 in a relaxed state, the auxiliary piston 19 is displaced by the force of the compression spring 33 until it rests against the piston head 45.
  • the vent hole 55 is opened and the piston assembly 15 is inserted into the cylinder tube 1 with the cylinder cover 3 removed.
  • the intended for use sealing medium is now filled in the space 35 until the state of the vent is reached.
  • the vent hole 55 is now closed and built by further supply of the sealing medium via the check valve 53, a pressure in the space 35 until the auxiliary piston moves against the force of the spring 33 against the annular body 27, such as this is shown in Fig. 1.
  • the piston seals 47 are both biased outward with a small differential pressure, so that ingress of dirt from the outside is not possible.
  • the piston seals 47 are lubricated by the sealing medium, which is preferably a fluid used on the fluid or oil side.
  • the sealing medium is preferably a fluid used on the fluid or oil side.
  • the sealing medium virtually all flowable substances can be used, including gas.
  • the use of the hydraulic fluid present on the fluid side is advantageous, because thus no foreign oils are present in the system.
  • a gas-biasing pressure is built up, for example, N 2 is entered, wherein in a practical application, for example, a biasing pressure of 60 bar can be provided, then the pressure in the space 35 and in the recess 39 increases in this example to a pressure value of 60 bar plus the pressure generated by the force of the spring 33 by means of the auxiliary piston 19, so in the example mentioned to about 65 bar.
  • the pressure in the recess 39 is higher than on the gas side 23, no migration of Gas on the gas side closest to the gasket 23 47 possible.
  • the pressure in the storage enclosure so loaded the fluid side 25 with the fluid pressure increases in a corresponding manner, the pressure in the storage enclosure, so that the pressure on the gas side 23 increases accordingly, as thought game assumed, for example, to 150 bar.
  • This increases the Pressure in the space containing the sealing medium 35 and in the recess 39 to a pressure value corresponding to the gas pressure on the gas side 23 plus the pressure generated by the spring 33 on the auxiliary piston 19 pressure, ie in the example mentioned to about 155 bar
  • the piston seals 47 applied differential pressure also only about 5 bar, ie In operation, the piston seals 47 are loaded exclusively with the mentioned, low differential pressure.
  • the pressure accumulator according to the invention is in particular protected against gas losses at standstill times, ie in the absence of fluid pressure, because the prevailing in the space 35 and the recess 39 pressure of the sealing medium is always higher than the pressure on the gas side 23rd

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)
  • Details Of Reciprocating Pumps (AREA)
  • Braking Systems And Boosters (AREA)
EP03001475A 2002-03-05 2003-01-23 Druckspeicher Expired - Lifetime EP1342922B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10209663A DE10209663C1 (de) 2002-03-05 2002-03-05 Druckspeicher
DE10209663 2002-03-05

Publications (3)

Publication Number Publication Date
EP1342922A2 EP1342922A2 (de) 2003-09-10
EP1342922A3 EP1342922A3 (de) 2004-05-26
EP1342922B1 true EP1342922B1 (de) 2006-11-29

Family

ID=7714024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03001475A Expired - Lifetime EP1342922B1 (de) 2002-03-05 2003-01-23 Druckspeicher

Country Status (5)

Country Link
EP (1) EP1342922B1 (es)
AT (1) ATE347039T1 (es)
DE (2) DE10209663C1 (es)
DK (1) DK1342922T3 (es)
ES (1) ES2275955T3 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004008768A1 (de) * 2004-02-23 2005-09-08 Albrecht, Friedhelm Rohrförmiger Körper mit Deckeln
DE102004048822A1 (de) * 2004-10-07 2006-04-13 Continental Teves Ag & Co. Ohg Elektrohydraulisches Aggregat mit integriertem Druckmittelspeicher oder Druckmitteldämpfer
DE102011089951A1 (de) * 2011-12-27 2013-06-27 Robert Bosch Gmbh Hydraulisch gesteuertes Speicherkammerventil
CN109854561A (zh) * 2019-02-12 2019-06-07 广西玉柴重工有限公司 一种液路容变阀

Family Cites Families (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
CH591020A5 (en) * 1975-08-15 1977-08-31 Gfeller Hans High pressure storage reservoir - has separator of two longitudinally displaceable pistons
DE3930557A1 (de) * 1989-09-13 1991-03-14 Bosch Gmbh Robert Druckmittelspeicher, insbesondere fuer fahrzeug-bremsanlagen
DE19701303A1 (de) * 1997-01-16 1998-07-23 Hydac Technology Gmbh Kolbenspeicher mit Dichtungsvorrichtung
DE19740150A1 (de) * 1997-09-12 1999-03-25 Hydac Technology Gmbh Kolbenspeicher mit Tiefenfiltrationsdichtung

Also Published As

Publication number Publication date
DE10209663C1 (de) 2003-07-31
ES2275955T3 (es) 2007-06-16
ATE347039T1 (de) 2006-12-15
EP1342922A3 (de) 2004-05-26
DK1342922T3 (da) 2007-03-26
EP1342922A2 (de) 2003-09-10
DE50305803D1 (de) 2007-01-11

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