EP0960278A1 - Accumulateur hydraulique - Google Patents

Accumulateur hydraulique

Info

Publication number
EP0960278A1
EP0960278A1 EP98903060A EP98903060A EP0960278A1 EP 0960278 A1 EP0960278 A1 EP 0960278A1 EP 98903060 A EP98903060 A EP 98903060A EP 98903060 A EP98903060 A EP 98903060A EP 0960278 A1 EP0960278 A1 EP 0960278A1
Authority
EP
European Patent Office
Prior art keywords
pressure
pressure accumulator
accumulator
chamber
reservoir
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
EP98903060A
Other languages
German (de)
English (en)
Other versions
EP0960278B1 (fr
Inventor
Pekka MÄKYNEN
Raimo MÄKYNEN
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.)
Hydroll Oy
Original Assignee
Hydroll Oy
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 Hydroll Oy filed Critical Hydroll Oy
Publication of EP0960278A1 publication Critical patent/EP0960278A1/fr
Application granted granted Critical
Publication of EP0960278B1 publication Critical patent/EP0960278B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • 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
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means

Definitions

  • the invention relates to a hydraulic accumulator for hydraulic systems.
  • the major disadvantage in present pressure accumulators is that several accumulators are needed in the hydraulic system, whereat the price of the system tends to become too high. Especially, on using double-acting cylinders and hydraulic turning gears two accumulators are needed , one for each direction of motion.
  • the development of double-acting pressure accumulators has been obstructed by technical problems by filling the pressure chamber. Especially, the use of mass- produced ready-machined tubes has been problematic, since in order to get overpressure gas into place, needed between the pistons of a double-acting pressure accumulator, it has been a must to machine and weld the cylinder mantle in spite of the risk of deformation and, accordingly, problems of tightness.
  • Fig. 1 is a schematic representation of a double-acting hydraulic cylinder 20 combined with pressure accumulator 21.
  • Fig. 2 is pressure accumulator 21 in resting position.
  • Fig. 3 is pressure accumulator 21 opened for gas fill.
  • Fig. 4 is pressure accumulator 21 in operating position so that from the left side of the accumulator illustrated in the figure working pressure is directed towards the accumulator.
  • Fig. 5 is pressure accumulator 21 in operating position so that from the right side of the accumulator illustrated in the figure working pressure is directed towards the accumulator.
  • Fig. 6 is pressure accumulator 21 in operating position so that from both sides of the accumulator illustrated in the figure working pressure is directed towards the accumulator.
  • Fig. 7 is a pressure accumulator in the end of which there is a combination of a service and pressure connection.
  • Fig. 8 is a pressure accumulator in the end of which the service connection and the pressure connection are separated.
  • Figure 1 shows a double-acting hydraulic cylinder 20 the pressure connections 22 and 23 corresponding to its working motions in two directions. Accordingly, to these connections the pressure connections 4 and 10 of the double-acting pressure accumulator 21 are connected.
  • the pressure connections 4 and 10 of the double-acting pressure accumulator 21 are connected.
  • the same pressure is directected towards pressure connections 4 or 10 in the pressure accumulator and further to pressure chamber 11 or 12 in the pressure accumulator.
  • the pressure accumulator 21 will take the shocks absorbing them by yielding due to the spring effect of the accumulator.
  • the spring effect of the accumulator is produced in filling the pressure chamber 13 with pressurized gas.
  • FIG. 2 shows schematically the pressure accumulator 21, where it has two separate end chambers 11 and 12.
  • the pressure of the hydraulic system is conveyed to these end chambers from two different spots in the system.
  • Pressure chamber 13 contains high-pressure gas.
  • Pressure chamber 13 is separated from end chambers 11 and 12 by pistons 2 and 5 which are fitted with pressure packings 3 and 6.
  • Piston 5 has a hole 14 running throuhg the piston and joining pressure chamber 13 and pressure chamber 12 together.
  • the gas filling tube 9 and valve 8 are fitted, through which pressure chamber 13 is filled with pressure gas.
  • End part 7 of pressure accumulator 21 is detachable for filling.
  • Figure 3 shows schematically the pressure accumulator 21, where the end part, illustrated in figure 2, has been detached for refill of pressure chamber 13 with pressurized gas.
  • the gas hose of the filling equipment is connected to filling tube 9.
  • Valve 8 is then opened and a proper quantity of gas is let in into chamber 13 and then valve 8 is closed and the end part 7 as per fig. 2 reassembled.
  • Figure 4 shows schematically the pressure accumulator 21 so that in a hydraulic system furnished with pressure accumulator 21, pressure prevails in that part of the system which is connected to end chamber 12 of pressure accumulator 21. Due to pressure piston 5 has moved towards pressure chamber 13 making the gas in the pressure chamber to compress and the pressure to rise further. Due to the spring effect of compressed gas in pressure chamber 13 the hydraulic fluid pressure variations will be received in a favourable way so that the impacts of the shocks get effectively softened and absorbed.
  • Figure 5 shows schematically the pressure accumulator 21 so that in a hydraulic system furnished with pressure accumulator 21, pressure prevails in that part of the system which is connected to the end chamber 11 of pressure accumulator 21. Due to pressure the piston 2 has moved towards pressure chamber 13 making the gas in the pressure chamber to compress and the pressure to rise further. Due to the spring effect of compressed gas in pressure chamber 13 the hydraulic fluid pressure variations will be received in a favourable way so that the impacts of the shocks get effectively softened and absorbed.
  • Figure 6 shows schematically the pressure accumulator 21 so that in any hydraulic system furnished with pressure accumulator 21, pressure prevails in both the system parts whhich are connected to end chamber 11 and 12 of pressure accumulator 21. Due to the pressure piston 2 and piston 5 have moved towarda pressure chamber 13 making the gas in the pressure chamber to compress and the pressure to rise further. Due to the spring effect of compressed gas in pressure chamber 13 the hydraulic fluid pressure variations will be received in a favourable way so that the impacts of the shocks get effectively softened and absorbed.
  • the end part 7 of the illustrated pressure accumulator 21 is furnished with a closing, leak-proof acces hole 16, through which service of the accumulator can be carried out, its function checked and pressure chamber 13 refilled without detaching end part 7 and the pressure pipes. End part 7 is fixed to the end of a tubular pressure connection 10 and the real pressure joint 17 arranged in the side face of this pressure connection 10.
  • a pressure accumulator according to this invention can be accomplished as a piston accumulator as well as a membran accumulator.
  • the accumulator can be a multifunction unit.

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)
  • Braking Systems And Boosters (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Vehicle Body Suspensions (AREA)
EP98903060A 1997-02-14 1998-02-16 Accumulateur hydraulique Expired - Lifetime EP0960278B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI970621A FI106399B (fi) 1997-02-14 1997-02-14 Paineakku
FI970621 1997-02-14
PCT/FI1998/000140 WO1998036174A1 (fr) 1997-02-14 1998-02-16 Accumulateur hydraulique

Publications (2)

Publication Number Publication Date
EP0960278A1 true EP0960278A1 (fr) 1999-12-01
EP0960278B1 EP0960278B1 (fr) 2003-11-19

Family

ID=8548202

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98903060A Expired - Lifetime EP0960278B1 (fr) 1997-02-14 1998-02-16 Accumulateur hydraulique

Country Status (8)

Country Link
EP (1) EP0960278B1 (fr)
AT (1) ATE254724T1 (fr)
AU (1) AU722352B2 (fr)
CA (1) CA2281786C (fr)
DE (1) DE69819872T2 (fr)
FI (1) FI106399B (fr)
NO (1) NO314363B1 (fr)
WO (1) WO1998036174A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2420380A (en) * 2004-11-18 2006-05-24 Parker Hannifin Plc Twin piston gas filled hydraulic actuator
CN104514758A (zh) * 2013-09-27 2015-04-15 陈启星 基于集液器和夹心活塞的液封蓄能器及其液压系统
DE102014004610A1 (de) * 2014-03-29 2015-12-03 Anatolij Bolenko Mit Unterwasserdruck und doppeltem Zylinder Luft komprimieren.
CN110552918B (zh) * 2018-05-31 2021-01-12 宝武特种冶金有限公司 用于无缝钢管热挤压产线液压系统的氮气补充控制方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467140A (en) * 1965-07-16 1969-09-16 Ralph P Piffath Hermetical sealing mechanism
US3907001A (en) * 1973-02-12 1975-09-23 Pneumo Dynamics Corp Combination accumulator reservoir

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9836174A1 *

Also Published As

Publication number Publication date
ATE254724T1 (de) 2003-12-15
FI970621A0 (fi) 1997-02-14
NO993880D0 (no) 1999-08-11
NO993880L (no) 1999-10-14
WO1998036174A1 (fr) 1998-08-20
NO314363B1 (no) 2003-03-10
DE69819872D1 (de) 2003-12-24
FI970621A (fi) 1998-08-15
AU722352B2 (en) 2000-07-27
AU5991898A (en) 1998-09-08
EP0960278B1 (fr) 2003-11-19
CA2281786C (fr) 2006-08-01
DE69819872T2 (de) 2004-08-05
CA2281786A1 (fr) 1998-08-20
FI106399B (fi) 2001-01-31

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