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WO1994011657A1 - Agencement d'etanchement de cylindres hydrauliques - Google Patents

Agencement d'etanchement de cylindres hydrauliques Download PDF

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Publication number
WO1994011657A1
WO1994011657A1 PCT/EP1993/003201 EP9303201W WO9411657A1 WO 1994011657 A1 WO1994011657 A1 WO 1994011657A1 EP 9303201 W EP9303201 W EP 9303201W WO 9411657 A1 WO9411657 A1 WO 9411657A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
sealing rings
arrangement according
sealing
pressure
Prior art date
Application number
PCT/EP1993/003201
Other languages
German (de)
English (en)
Inventor
Robert Forwick
Original Assignee
Robert Forwick
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
Priority claimed from DE9215605U external-priority patent/DE9215605U1/de
Priority claimed from DE19924238638 external-priority patent/DE4238638A1/de
Application filed by Robert Forwick filed Critical Robert Forwick
Priority to EP94900148A priority Critical patent/EP0621932A1/fr
Publication of WO1994011657A1 publication Critical patent/WO1994011657A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
    • F16J15/48—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings influenced by the pressure within the member to be sealed
    • 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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings

Definitions

  • the invention relates to an arrangement for the mutual sealing of telescopically movable hydraulic cylinders, to which only water can be supplied as pressure medium, with a circumferential seal in a circumferential groove of the pressure piston carrying the internal cylinder.
  • the high viscosity of the medium means that a seal is generally unproblematic, provided the outer diameter of the pressure piston and the inner diameter of the external hydraulic cylinder have sufficient concentricity. Even when using compressed air as the hydraulic medium, there are few problems, since even with a slight leakage, air flowing past the seal does not have a disturbing or unpleasant effect in the exterior.
  • the present invention is therefore based on the object of creating an arrangement with which an optimal sealing of such telescopically movable hydraulic cylinders is possible, which requires little effort and is largely maintenance-free and reliable.
  • at least one sealing ring with a circular and slightly larger diameter than the height of the groove is arranged in the annular groove opening towards the outer circumference of the cylindrical pressure piston and that the groove, the horizontal width of which is larger than the diameter of the sealing ring, through the pressure piston penetrating channels with the water serving as hydraulic fluid is acted on such that the sealing rings are pressed by the water pressure against the inner wall of the external hydraulic cylinder.
  • the axial length of the groove is slightly less than the sum of the diameters of the two sealing rings. It is sufficient if the length of the groove is approximately 2.5% smaller than the diameter of a sealing ring or the two sealing rings lying one above the other.
  • the outer diameter of the sealing rings is larger than the inner diameter of the adjacent hydraulic cylinder.
  • the outer diameter of a sealing ring should be approximately 2.5% larger than the inner diameter of the hydraulic cylinder.
  • sealing rings are made of an elastic chloroprene polymer, e.g. Neoprene, exist and their Shore A hardness is about 80.
  • 1 shows a longitudinal section through a plurality of hydraulic cylinders, one inside the other, with corresponding pressure pistons and one sealing ring each in a circumferential groove
  • 2 shows an enlarged section of the sealing area in such a pressure piston
  • FIG. 3 shows a longitudinal section through a plurality of hydraulic cylinders lying one inside the other, each with two sealing rings in a groove and
  • FIG. 1 for example three hydraulic cylinders 1, 2 and 3 which can be telescoped into one another are provided, the central hydraulic cylinder 2 being provided by a pressure piston 4 sealingly guided in the hydraulic cylinder 1 and the hydraulic cylinder 3 being guided by a pressure piston guided in the hydraulic cylinder 2 5 can be moved.
  • annular grooves 8 and 9 are cut into the pressure pistons on the outer circumference, into each of which a sealing ring 10 or 11 is inserted.
  • the annular groove 8 is connected via a channel 12 to the large through bore 7 and the annular groove 9 via a radial channel 13 and an axial channel 14 with the liquid space 15.
  • a section of the sealing area in the pressure piston 5 is shown in more detail in FIG.
  • the groove 9 is wider than the diameter of the sealing ring 11, so that the pressurized water flowing in via the channels 14 and 13 is distributed over the annular groove 9 and, under uniform pressure, the sealing ring 11 outwards against the inner wall of the hydraulic cylinder 2 can press.
  • the sealing ring 11 is slightly larger in diameter than the height of the groove 9 and, in the stretched state, has an outer diameter which is slightly larger than the inner diameter of the hydraulic cylinder 2. This ensures that liquid does not pass between the pressure piston 16 via the channel 16 5 and hydraulic cylinder 2 can flow upwards, so that liquid flows out of the groove 9 past the sealing ring 11 into this gap.
  • FIG. 1 a section of the sealing area in the pressure piston 5 is shown in more detail in FIG.
  • the groove 19, in which the two sealing rings 22 and 23 are inserted is wider than the diameter of the two sealing rings 22 and 23, while its height is approximately 2.5% smaller than the sum of the diameters of the two sealing rings 22 and 23 should be.
  • the two sealing rings 22 and 23 have an outer diameter which is approximately 3.0% larger than the inner diameter of the adjacent hydraulic cylinder 2.
  • the two sealing rings 22 and 23 are thus pressed tightly against the hydraulic cylinder 2 by the water pressure and, on the other hand, the pressure cylinder 5 with the hydraulic cylinder 3 is then raised by the water pressure. Through this constantly acting on the sealing rings 22 and 23. Pressure and its tight contact with the hydraulic cylinder 2 is prevented once that water through the channel 13 in the overlying gap 25 between the hydraulic cylinders 2 and 3 and through the gap 16 between the pressure piston 5 and the hydraulic cylinder 2 past the two sealing rings 22 and 23 in can penetrate the gap 25 above.
  • the sealing rings 22 and 23 in the groove 19 also ensure a further tight contact with the cylinder wall 2, so that no water can escape upwards.
  • the sealing rings are made of an elastic chloroprene polymer, such as neoprene (trademark of the Dupont company) and have a Shore A hardness of about 80. This ensures high fatigue strength and negligible permanent deformation.
  • Such hydraulic cylinders operated with water are particularly suitable for use in bathing aids with a seat which can be lowered hydraulically and moved upward in a bath tub and which are generally operated only with tap water under tap water pressure.
  • any other application is also conceivable in which hydraulic operation must be carried out with water alone and without additional lubricants.
  • the arrangement described above ensures an optimal and practically wear-free seal between the individual hydraulic cylinders. Corresponding tests with 5000 strokes have shown no deterioration in the sealing effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Sealing Devices (AREA)

Abstract

Afin de rendre étanches des cylindres hydrauliques emboîtables de manière télescopique et susceptibles de recevoir exclusivement de l'eau comme milieu sous pression, deux bagues d'étanchéité (12, 13) à section transversale circulaire superposées dans le sens axial sont situées dans une rainure annulaire (9) ouverte vers la circonférence extérieure du piston cylindrique de pression (5), assurant une étanchéité optimale sans phénomènes d'usure. La rainure (9), dont la largeur horizontale est supérieure au diamètre des bagues d'étanchéité (12, 13), reçoit par des canaux (15, 16) qui traversent le piston de pression (5) l'eau qui sert de liquide hydraulique, de telle sorte que les bagues d'étanchéité (12, 13) sont sollicitées par la pression de l'eau contre la paroi intérieure du cylindre hydraulique extérieur (2).
PCT/EP1993/003201 1992-11-16 1993-11-15 Agencement d'etanchement de cylindres hydrauliques WO1994011657A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94900148A EP0621932A1 (fr) 1992-11-16 1993-11-15 Agencement d'etanchement de cylindres hydrauliques

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DEG9215605.3U 1992-11-16
DE9215605U DE9215605U1 (de) 1992-11-16 1992-11-16 Anordnung für die Abdichtung von Hydraulikzylindern
DEP4238638.1 1992-11-16
DE19924238638 DE4238638A1 (de) 1992-11-16 1992-11-16 Anordnung zur Abdichtung von Hydraulikzylindern

Publications (1)

Publication Number Publication Date
WO1994011657A1 true WO1994011657A1 (fr) 1994-05-26

Family

ID=25920493

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1993/003201 WO1994011657A1 (fr) 1992-11-16 1993-11-15 Agencement d'etanchement de cylindres hydrauliques

Country Status (2)

Country Link
EP (1) EP0621932A1 (fr)
WO (1) WO1994011657A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2795143A1 (fr) * 1999-06-17 2000-12-22 Lardet Paul Verin pneumatique telescopique
WO2003076814A1 (fr) * 2002-03-05 2003-09-18 Parker Hannifin Corporation Cylindre telescopique sans purge
WO2006125339A1 (fr) * 2005-05-23 2006-11-30 Zongze Wang Amortisseur de vehicule motorise
CN102889388A (zh) * 2012-10-19 2013-01-23 东北石油大学 一种液压缸活塞自适应密封装置
WO2013168153A1 (fr) * 2012-05-07 2013-11-14 Emigal Electronic Test Solutions Ltd. Joints d'étanchéité à structure variable
EP3290179A1 (fr) * 2016-08-30 2018-03-07 Michel Thorsten Dispositif de remplissage d'un moule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104033445A (zh) * 2014-04-29 2014-09-10 苏州中远电梯有限公司 一种电梯专用的多级液压缸

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1026419A (en) * 1963-12-19 1966-04-20 English Drilling Equipment Com Improvements in hydraulic pis ton and cylinder combinations
CH472609A (de) * 1966-03-24 1969-05-15 Pfaudler Werke Ag Abdichtung, insbesondere Notabdichtung, zwischen einer Welle, Spindel oder Stange und einem Gehäusedurchgang
DE2929351A1 (de) * 1979-07-20 1981-02-05 Medtronic Gmbh Dichtungsanordnung, insbesondere rotierende dichtung
JPS5868546A (ja) * 1981-10-16 1983-04-23 Hoei Kogyo Kk ピストンヘツドのシ−ル装置
DE3302449C1 (de) * 1983-01-26 1984-03-15 Montan-Hydraulik GmbH, 4755 Holzwickede Dichtungsanordnung für einen eine Umgehung überfahrenden Kolben
DE9207833U1 (de) * 1991-08-02 1992-09-03 Rego-fix AG, Reigoldswil Dichtungsvorrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1026419A (en) * 1963-12-19 1966-04-20 English Drilling Equipment Com Improvements in hydraulic pis ton and cylinder combinations
CH472609A (de) * 1966-03-24 1969-05-15 Pfaudler Werke Ag Abdichtung, insbesondere Notabdichtung, zwischen einer Welle, Spindel oder Stange und einem Gehäusedurchgang
DE2929351A1 (de) * 1979-07-20 1981-02-05 Medtronic Gmbh Dichtungsanordnung, insbesondere rotierende dichtung
JPS5868546A (ja) * 1981-10-16 1983-04-23 Hoei Kogyo Kk ピストンヘツドのシ−ル装置
DE3302449C1 (de) * 1983-01-26 1984-03-15 Montan-Hydraulik GmbH, 4755 Holzwickede Dichtungsanordnung für einen eine Umgehung überfahrenden Kolben
DE9207833U1 (de) * 1991-08-02 1992-09-03 Rego-fix AG, Reigoldswil Dichtungsvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 163 (M - 229)<1308> 16 July 1983 (1983-07-16) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2795143A1 (fr) * 1999-06-17 2000-12-22 Lardet Paul Verin pneumatique telescopique
WO2003076814A1 (fr) * 2002-03-05 2003-09-18 Parker Hannifin Corporation Cylindre telescopique sans purge
US6851349B2 (en) 2002-03-05 2005-02-08 Parker-Hannifin Corporation Bleederless telescopic cylinder
WO2006125339A1 (fr) * 2005-05-23 2006-11-30 Zongze Wang Amortisseur de vehicule motorise
WO2013168153A1 (fr) * 2012-05-07 2013-11-14 Emigal Electronic Test Solutions Ltd. Joints d'étanchéité à structure variable
US9709197B2 (en) 2012-05-07 2017-07-18 Emigal Electronic Test Solutions Ltd. Variable structure seals
CN102889388A (zh) * 2012-10-19 2013-01-23 东北石油大学 一种液压缸活塞自适应密封装置
CN102889388B (zh) * 2012-10-19 2014-12-17 东北石油大学 一种液压缸活塞自适应密封装置
EP3290179A1 (fr) * 2016-08-30 2018-03-07 Michel Thorsten Dispositif de remplissage d'un moule

Also Published As

Publication number Publication date
EP0621932A1 (fr) 1994-11-02

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