EP4039986A1 - Accumulateur hydraulique - Google Patents

Accumulateur hydraulique Download PDF

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Publication number
EP4039986A1
EP4039986A1 EP21155831.7A EP21155831A EP4039986A1 EP 4039986 A1 EP4039986 A1 EP 4039986A1 EP 21155831 A EP21155831 A EP 21155831A EP 4039986 A1 EP4039986 A1 EP 4039986A1
Authority
EP
European Patent Office
Prior art keywords
end wall
container
round thread
thread
hydraulic 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.)
Pending
Application number
EP21155831.7A
Other languages
German (de)
English (en)
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.)
Roth Hydraulics GmbH
Original Assignee
Roth Hydraulics 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 Roth Hydraulics GmbH filed Critical Roth Hydraulics GmbH
Priority to EP21155831.7A priority Critical patent/EP4039986A1/fr
Priority to PCT/EP2022/052078 priority patent/WO2022167341A1/fr
Priority to CN202280013670.XA priority patent/CN116848328A/zh
Publication of EP4039986A1 publication Critical patent/EP4039986A1/fr
Pending 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
    • 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
    • F15B2201/60—Assembling or methods for making accumulators
    • F15B2201/605—Assembling or methods for making housings therefor

Definitions

  • the invention relates to a hydraulic accumulator for storing a pressurized hydraulic fluid, with a storage tank having a tank base and two opposite end walls, and the storage tank having a first tank space filled with the hydraulic fluid and a second tank space.
  • the second container space is in particular filled with a gas, for example with nitrogen.
  • Hydraulic accumulators are used to store and release hydraulic energy.
  • the hydraulic fluid flows under pressure into the storage tank or into the first tank space of the storage tank and compresses the gas, in particular the nitrogen, which is located in the second tank space of the storage tank. This stores hydraulic energy that is available as stored energy at a later point in time. When discharging the hydraulic accumulator, the hydraulic energy can be released.
  • the gas expands and the hydraulic fluid flows out of the storage tank.
  • the first and the second container space of the storage container are usually separated from one another by a separating element, for example by a piston, a membrane or a bladder.
  • a distinction is made between piston accumulators, in which the separating element is a piston that can be moved in the container, and diaphragm accumulators and bladder accumulators.
  • Hydraulic accumulators of the type described above are known from practice in different design variants. However, the known hydraulic accumulators are often characterized by disadvantages. Many known hydraulic accumulators have a relatively low fatigue strength and thus a short lifespan. The achievable bursting pressure and the achievable number of load changes often leave a lot to be desired.
  • hydraulic accumulators are also known in which the two opposite end walls are screwed into the container base by means of a thread. A metric thread is regularly used for the thread. These known hydraulic accumulators exhibit relatively rapid material fatigue on the thread. When screw-in end walls are used, it is not uncommon for sealing elements or guide elements to be damaged, so that the service life of the hydraulic accumulator is also reduced as a result.
  • the known hydraulic accumulators are also characterized by the disadvantage that they fail relatively quickly, particularly if they are used improperly. In this respect, there is a need for improvement.
  • the invention is based on the technical problem of specifying a hydraulic accumulator of the type mentioned at the outset, in which the disadvantages described above can be avoided effectively and in a simple manner.
  • the invention teaches a hydraulic accumulator for storing a pressurized hydraulic fluid, with a storage tank having a tank base and two opposite end walls, the storage tank having a first tank space filled with the hydraulic fluid and a second tank space comprises, wherein the first and the second container space are separated from each other by at least one, preferably by a movable or displaceable separating element, wherein a first end wall delimits the first container space with the hydraulic fluid and wherein a second end wall delimits the second container space, wherein at least one end wall is screwed into the container base by means of a round thread.
  • the hydraulic fluid is in particular an oil or a similar hydraulic fluid. It is within the scope of the invention that the second container space is filled with a gas, in particular with nitrogen.
  • the round thread is provided directly on an end wall or on the edge of the end wall.
  • the round thread expediently runs around the entire circumference of the end wall or over the entire edge circumference of the end wall.
  • the end wall is thus screwed directly into the container base via the round thread of the end wall.
  • an end wall is screwed into the container base via at least one adapter and this adapter is provided with the round thread.
  • the end wall in question is expediently connected to the adapter, and the unit consisting of end wall and adapter is screwed into the container base via the round thread of the adapter.
  • the adapter is an intermediate ring which preferably runs completely around the end wall. The end wall is attached to the intermediate ring and the end wall and intermediate ring assembly is screwed into the container base via the round thread of the intermediate ring. The round thread expediently runs around the entire circumference of the intermediate ring.
  • the intermediate ring surrounds the associated end wall and preferably extends over only part of the axial length of the end wall.
  • Axial length of the end wall means the length of the end wall parallel to the longitudinal direction of the Storage container recommended dimensions, the intermediate ring extends over 30% to 80% of the axial length of the associated end wall.
  • the first end wall delimiting the first container space filled with the hydraulic fluid is expediently screwed into the container base by means of a round thread.
  • both opposite end walls are screwed into the container base by means of a round thread.
  • the invention is based on the knowledge that the use of a round thread for the screw connection between an end wall and the container base of the hydraulic accumulator has considerable advantages. In addition to a higher load and less wear on the thread, damage during assembly and disassembly can also be avoided.
  • the invention is based in particular on the finding that the thread length can be reduced considerably when using a round thread compared to using a metric thread while the storage container has the same load capacity. This results in an advantageous saving in material and thus cost savings.
  • the round thread is arranged directly at the edge on the associated end wall or on the adapter.
  • the external thread designed as a round thread runs around or continuously around the edge over the outer circumference of the end wall or the adapter.
  • the container base section associated with the respective end wall has an internal thread designed as a round thread, and this internal thread designed as a round thread expediently runs on Container base portion around or continuously around the inner circumference of the container base.
  • an end wall screwed into the container base by means of a round thread has an external round thread with rounded thread crests (thread teeth) and that the associated container base section has an internal round thread with rounded thread crests (thread teeth).
  • an end wall screwed into the container base by means of a round thread has an external round thread with rounded thread notches (thread roots) and that the associated container base section has an internal round thread with rounded thread notches (thread roots).
  • the flank angle ⁇ of the round thread or the external round thread and the internal round thread is 25° to 35°, in particular 28° to 32° and preferably 30° or approximately 30°.
  • the hydraulic fluid present in the first tank space of the storage tank is preferably an oil. It is within the scope of the invention for at least one gas or at least one compressible gas to be accommodated in the second container space of the storage container, which is, for example, nitrogen gas. In principle, other gases can also be accommodated in the second container space.
  • the storage container or the container base of the storage container prefferably be of cylindrical design.
  • the two opposing end walls then form the cylinder cover of the storage container or the container base, as it were, and are circular in plan view educated.
  • the inner diameter of the cylindrical storage container or the cylindrical container base is in particular 60 mm to 600 mm and according to a preferred embodiment 100 mm to 400 mm, preferably 100 mm to 360 mm. It goes without saying that the two opposite end walls that can be screwed into the container base are then designed according to this inner diameter.
  • the volume of the storage tank according to the invention is 0.1 l to 1500 l, in particular 0.5 l to 1200 l, preferably 1 l to 700 l and particularly preferably 10 l to 400 l.
  • the container length of the storage container is 100 mm to 10000 mm, preferably 200 mm to 6000 mm and particularly preferably 400 mm to 5000 mm.
  • the axial length of the round thread is 20 mm to 400 mm and preferably 25 mm to 150 mm and particularly preferably 30 mm to 120 mm. The axial length is measured in the longitudinal direction of the storage container.
  • a particularly recommended embodiment of the hydraulic accumulator according to the invention is characterized in that the hydraulic accumulator is a piston accumulator and that the separating element is a piston that can be displaced in the container.
  • the piston is expediently displaceable in the longitudinal direction of the container base or the cylindrical container base.
  • the piston expediently has at least one sealing element for the sealing separation of the two container spaces.
  • the hydraulic accumulator is a diaphragm accumulator and the separating element is a diaphragm that can be moved or shifted in the container.
  • the membrane consists of at least one Plastic, in particular made of an elastomeric plastic.
  • the membrane it is also within the scope of the invention for the membrane to be in the form of a metallic membrane.
  • a further embodiment of the invention is characterized in that the hydraulic accumulator is a bladder accumulator and that the separating element is a bladder that can be moved or expanded in the container.
  • the bladder expediently consists of at least one plastic, in particular an elastomeric plastic.
  • the bladder can be made of rubber.
  • the invention is based on the finding that the hydraulic accumulator according to the invention is distinguished by considerable advantages compared to the hydraulic accumulators known hitherto.
  • the invention is based on the finding that when using a round thread for the screw-in end walls, a significantly higher fatigue strength and thus a significantly longer service life of the hydraulic accumulator according to the invention can be achieved compared to the previously known hydraulic accumulators.
  • the achievable number of load changes or the pressure fluctuation range is significantly higher than in the case of the known hydraulic accumulators with end walls that can be screwed in via metric threads.
  • the bursting pressure of the hydraulic accumulator can be increased by a factor of 2 or more compared to the known accumulators.
  • the risk of the cylinder bending up undesirably can be reduced considerably or, in the case of normal stresses, virtually eliminated. It is also important that the thread length can be significantly reduced compared to the thread lengths of metric threads with the same load capacity of the hydraulic accumulator. This is accompanied by a saving in material and thus cost savings. Also the risk of damaging surfaces or sealing elements and guide elements can be reduced considerably compared to metric threads when using the round thread according to the invention.
  • the assembly and disassembly of the end walls according to the invention is possible in a problem-free and damage-free manner. A failure of the hydraulic unit due to improper use can be almost completely avoided with the round threads used according to the invention. In this respect, the invention is characterized by considerable advantages.
  • the figures show a hydraulic accumulator according to the invention in the form of a piston accumulator for storing a pressurized hydraulic fluid 1.
  • the hydraulic fluid 1 is in particular an oil.
  • a storage container 3 with a container base 4 and two opposite end walls 5, 6 is present.
  • the Storage container 3 or the container base 4 is preferably and in the exemplary embodiment cylindrical.
  • the storage tank 3 has a first tank space 7 which is filled with the hydraulic fluid 1 or with the oil. Furthermore, there is a second container space 8 which is filled with a gas, in particular with nitrogen. According to a preferred embodiment and in the exemplary embodiment, the first and the second container space 7, 8 are separated from one another by a separating element 9 designed as a displaceable piston. The piston can be displaced in the longitudinal direction of the cylindrical storage container 3 .
  • a first end wall 5 delimits the first container space 7 with the hydraulic fluid 1 and a second end wall 6 delimits the second container space 8 with the gas 2 contained therein.
  • the invention teaches that at least one end wall 5, 6 can be screwed into the container base by means of a round thread 10 4 screwed in. Furthermore, sealing elements 19 are arranged between the end walls 5 , 6 and the container base 4 .
  • each end wall 5, 6 is connected to an adapter designed in the form of an intermediate ring 18.
  • the intermediate ring 18 surrounds the associated end wall 5, 6 and runs around the circumference of the end wall 5, 6.
  • the round thread 10 according to the invention is provided on the outside edge of the adapter or the intermediate ring 18 .
  • the intermediate ring 18 extends preferably and according to the exemplary embodiment figure 2 only over part of the axial length of the associated end wall 5, 6. It is within the scope of the invention for an end wall 5, 6 to be firmly connected to the associated adapter or intermediate ring 18.
  • both end walls 5, 6 are screwed into the container base 4 by means of a round thread 10.
  • the round thread 10 used according to the invention is in the figure 2 shown in more detail. It is within the scope of the invention that an end wall 5, 6 screwed in by means of a round thread 10 or the respective adapter has an external round thread 11 with rounded thread tips 12 and that the associated container base section 13 of the storage tank 3 has an internal round thread 14 with has rounded thread tips 15.
  • an end wall 5, 6 screwed in by means of a round thread 10 or the respective adapter has an external round thread 11 with rounded thread notches 16 and that the associated container base section 13 of the storage container 3 has an internal round thread 14 with rounded threaded notches 17 has.
  • the flank angle ⁇ of the external round thread 11 and the internal round thread 14 is 30°. This flank angle ⁇ has proven particularly useful within the scope of the invention.

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)
EP21155831.7A 2021-02-08 2021-02-08 Accumulateur hydraulique Pending EP4039986A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21155831.7A EP4039986A1 (fr) 2021-02-08 2021-02-08 Accumulateur hydraulique
PCT/EP2022/052078 WO2022167341A1 (fr) 2021-02-08 2022-01-28 Accumulateur hydraulique
CN202280013670.XA CN116848328A (zh) 2021-02-08 2022-01-28 液压蓄能器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21155831.7A EP4039986A1 (fr) 2021-02-08 2021-02-08 Accumulateur hydraulique

Publications (1)

Publication Number Publication Date
EP4039986A1 true EP4039986A1 (fr) 2022-08-10

Family

ID=74572634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21155831.7A Pending EP4039986A1 (fr) 2021-02-08 2021-02-08 Accumulateur hydraulique

Country Status (3)

Country Link
EP (1) EP4039986A1 (fr)
CN (1) CN116848328A (fr)
WO (1) WO2022167341A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523689Y1 (fr) * 1967-07-11 1977-01-26
EP0286777A2 (fr) * 1987-04-14 1988-10-19 Gesellschaft für Hydraulik-Zubehör mbH Unité piston-cylindre
US4793381A (en) * 1986-11-22 1988-12-27 Nobuyuki Sugimura Bladder supporting device in an accumulator
JPH04171311A (ja) * 1990-11-01 1992-06-18 Nobuyuki Sugimura 疲労に強いねじ構造
DE102013205264A1 (de) * 2013-03-26 2014-10-02 Robert Bosch Gmbh Hydropneumatischer Speicher

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215429B (en) * 1988-03-04 1992-10-28 Nobuyuki Sugimura Stepped thread joint

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523689Y1 (fr) * 1967-07-11 1977-01-26
US4793381A (en) * 1986-11-22 1988-12-27 Nobuyuki Sugimura Bladder supporting device in an accumulator
EP0286777A2 (fr) * 1987-04-14 1988-10-19 Gesellschaft für Hydraulik-Zubehör mbH Unité piston-cylindre
JPH04171311A (ja) * 1990-11-01 1992-06-18 Nobuyuki Sugimura 疲労に強いねじ構造
DE102013205264A1 (de) * 2013-03-26 2014-10-02 Robert Bosch Gmbh Hydropneumatischer Speicher

Also Published As

Publication number Publication date
CN116848328A (zh) 2023-10-03
WO2022167341A1 (fr) 2022-08-11

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