EP3296574A1 - Accumulateur avec indicateur de niveau de liquide - Google Patents

Accumulateur avec indicateur de niveau de liquide Download PDF

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Publication number
EP3296574A1
EP3296574A1 EP16306201.1A EP16306201A EP3296574A1 EP 3296574 A1 EP3296574 A1 EP 3296574A1 EP 16306201 A EP16306201 A EP 16306201A EP 3296574 A1 EP3296574 A1 EP 3296574A1
Authority
EP
European Patent Office
Prior art keywords
housing
indicator
piston
space
accumulator
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.)
Withdrawn
Application number
EP16306201.1A
Other languages
German (de)
English (en)
Inventor
Bertrand MAGNIER
Loic DELACOUDRE
Ronan LEBAIL
Guillaume BARRAS
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.)
Danfoss Power Solutions II SAS
Original Assignee
Eaton SAS
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 Eaton SAS filed Critical Eaton SAS
Priority to EP16306201.1A priority Critical patent/EP3296574A1/fr
Priority to PCT/EP2017/073710 priority patent/WO2018054939A1/fr
Publication of EP3296574A1 publication Critical patent/EP3296574A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F15B1/086—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor the gas cushion being entirely enclosed by the separating means, e.g. foam or gas-filled balls
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • 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
    • 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
    • F15B2201/405—Housings
    • F15B2201/4053—Housings characterised by the material
    • 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
    • F15B2201/405—Housings
    • F15B2201/4056—Housings characterised by the attachment of housing components
    • 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
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/515—Position detection for separating means

Definitions

  • the invention relates to an accumulator comprising:
  • a fluid under pressure is used.
  • a hydraulic system for example a hydraulic system to power a hydraulic cylinder or a cooling cycle, could be provided with an accumulator to compensate for volume variation of the fluid due to thermal variation.
  • the fluid volume charged in the hydraulic loop should be adjusted with accuracy. If too much fluid is charged and the fluid volume expands due to an increase of temperature, the accumulator cannot fully compensate for this volume increase, such that the pressure in the hydraulic system will rise, increasing the chance on damage of components of the hydraulic system.
  • Such a sightglass could be a transparent vertical tube, which is in fluid communication with the reservoir. The height of the fluid in the tube provides a indication of the fluid level in the reservoir.
  • An accumulator does not need a specific orientation to provide its function to the hydraulic system.
  • the accumulator can be arranged upside down and the piston will still be urged towards the supply opening of the accumulator.
  • the axial position, which the piston will assume in the housing, is dependent of the amount of fluid in the hydraulic system, the pressure of the fluid in the hydraulic system and the force of the urging means in the accumulator.
  • the position of the piston provides for an indication of the fluid level, independent on the orientation of the accumulator.
  • the position of the piston is made visible from the outside by arranging a magnet at the circumference of the piston, which magnet can attract a ferromagnetic part of an indicator on the outside of the housing.
  • a fluid tight space is a space impermeable for fluids like liquid or gas. This ensures that with the first fluid tight space, none of the fluid in the hydraulic system, which is connected to the first space via the supply opening, can leak along the piston into the second space. This first fluid tight space is required for the accumulator to perform its function and to maintain the amount of fluid in the hydraulic system.
  • a preferred embodiment further comprises an elongate indicator housing arranged on the housing wall, wherein the indicator housing comprises a elongate guide for guiding the indicator in axial direction.
  • the indicator housing will shield the indicator from any dirt or the like, which otherwise could impede the movement of the indicator. Especially, if the indicator is arranged on the accumulator during the lifetime of the accumulator, the indicator housing ensures that the even after a substantial part of the lifetime, the indicator still can move as desired.
  • the elongate guide is a linear channel, wherein the indicator is a ball and wherein the ball rolls through the channel under influence of the movement of the magnet on the piston.
  • the indicator By using a ball in a linear channel as the indicator, the indicator will have a low friction such that the magnetic field of the magnet can easily pull the ball through the linear channel and differences between the position of the indicator and the position of the piston are minimized.
  • the indicator housing comprises a sightglass to observe the position of the indicator.
  • a scale extends along the path of the indicator.
  • the scale can be set such that one can read the amount of fluid in the hydraulic system just by determining the position of the indicator relative to the scale.
  • blocking means are arranged in the housing for blocking rotation of the piston.
  • the piston could rotate slowly, when it is moved up and down in the housing. This would cause the magnet to move out of alignment with the indicator and cause wrong readings or even malfunction of the indicator. By blocking the rotation of the position, it is always ensured that the magnet is aligned in tangential direction with the indicator.
  • the urging means comprise a spring.
  • the second space is fluid tight and the urging means comprise a gas arranged in the second space.
  • a gas can be supplied to the second space, which gas will act as a gasspring.
  • the second space is provided with a filling opening, one can simply set the pressure of the gas in the second space and provide an easy adjustable accumulator, which is suited for a variety of different hydraulic systems.
  • Figures 1 and 2 shows an accumulator 1 having a cylindrical housing 2 with a piston 3 movable in axial direction and arranged in the housing 1.
  • the piston 3 has two circumferential grooves 4 to accommodate seals (not shown) for sealing the piston 3 on the inner surface of the housing 2 and to ensure that the first space 5 below the piston 3 is fluid tight and to ensure that the second space 6 above the piston 3 is also fluid tight.
  • the housing 2 is provided at the bottom with a supply opening 7 to supply a fluid under pressure to the first space 5. This fluid will move the piston 3 up, such that the gas in the second space 6 will be compressed until an equilibrium is achieved between the gas pressure in the second space 6 and the fluid pressure in the first space 5.
  • the piston 3 further comprises a magnet 8, which is arranged at the circumference of the piston 3 adjacent to the wall of the housing 2.
  • the indicator housing 9 has a linear channel 10, which extends in axial direction of the housing 2.
  • a ferromagnetic ball 11 is arranged in the linear channel 10, such that the magnet 8 can attract through the housing 2 of non-ferromagnetic material the ferromagnetic ball 11 and pull it along the linear channel 10 when the piston 3 moves up and down in the housing 2.
  • the linear channel 10 is covered by a transparent plate 12, such that a user can easily determine the position of the piston 3 inside of the housing 2 through the indicator ball 11.
  • the transparent plate 12 can be provided with a scale 13, which facilitates determining the exact position of the indicator ball 11 and accordingly the amount of fluid inside the first space 5.
  • the amount of fluid inside the first space 5 is in turn an indicator for the amount of fluid in the hydraulic system in which the accumulator 1 is arranged.

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)
EP16306201.1A 2016-09-20 2016-09-20 Accumulateur avec indicateur de niveau de liquide Withdrawn EP3296574A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16306201.1A EP3296574A1 (fr) 2016-09-20 2016-09-20 Accumulateur avec indicateur de niveau de liquide
PCT/EP2017/073710 WO2018054939A1 (fr) 2016-09-20 2017-09-20 Accumulateur à indicateur de niveau de fluide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16306201.1A EP3296574A1 (fr) 2016-09-20 2016-09-20 Accumulateur avec indicateur de niveau de liquide

Publications (1)

Publication Number Publication Date
EP3296574A1 true EP3296574A1 (fr) 2018-03-21

Family

ID=57121169

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16306201.1A Withdrawn EP3296574A1 (fr) 2016-09-20 2016-09-20 Accumulateur avec indicateur de niveau de liquide

Country Status (2)

Country Link
EP (1) EP3296574A1 (fr)
WO (1) WO2018054939A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110578721A (zh) * 2018-06-08 2019-12-17 布柯玛蓄能器（天津）有限公司 耐高低温活塞蓄能器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1283618A (fr) * 1961-03-13 1962-02-02 Continental Elektro Ind Ag Dispositif de contrôle pour appareil hydraulique comportant un accumulateur de gaz
JPH04131509A (ja) * 1990-09-19 1992-05-06 Koganei Ltd 流体圧作動機器の位置検出装置
JPH07233802A (ja) * 1994-02-21 1995-09-05 Ckd Corp シリンダ
DE19539551A1 (de) * 1995-10-12 1997-04-17 Siemens Ag Meßsystem und Verfahren zur Erfassung der Position eines Kolbens
WO2004081389A1 (fr) * 2003-03-11 2004-09-23 Hydac Technology Gmbh Accumulateur hydraulique a indication de position
DE102014215790A1 (de) * 2014-08-08 2016-02-11 Robert Bosch Gmbh Speicherkammerventilvorrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1283618A (fr) * 1961-03-13 1962-02-02 Continental Elektro Ind Ag Dispositif de contrôle pour appareil hydraulique comportant un accumulateur de gaz
JPH04131509A (ja) * 1990-09-19 1992-05-06 Koganei Ltd 流体圧作動機器の位置検出装置
JPH07233802A (ja) * 1994-02-21 1995-09-05 Ckd Corp シリンダ
DE19539551A1 (de) * 1995-10-12 1997-04-17 Siemens Ag Meßsystem und Verfahren zur Erfassung der Position eines Kolbens
WO2004081389A1 (fr) * 2003-03-11 2004-09-23 Hydac Technology Gmbh Accumulateur hydraulique a indication de position
DE102014215790A1 (de) * 2014-08-08 2016-02-11 Robert Bosch Gmbh Speicherkammerventilvorrichtung

Also Published As

Publication number Publication date
WO2018054939A1 (fr) 2018-03-29

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