WO2012107354A1 - Système de joint - Google Patents

Système de joint Download PDF

Info

Publication number
WO2012107354A1
WO2012107354A1 PCT/EP2012/051813 EP2012051813W WO2012107354A1 WO 2012107354 A1 WO2012107354 A1 WO 2012107354A1 EP 2012051813 W EP2012051813 W EP 2012051813W WO 2012107354 A1 WO2012107354 A1 WO 2012107354A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
valve
sealing material
inelastic
exhaust gas
Prior art date
Application number
PCT/EP2012/051813
Other languages
German (de)
English (en)
Inventor
Jürgen Kurth
Frank Sonnenschein
Original Assignee
Aktiebolaget Skf
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 Aktiebolaget Skf filed Critical Aktiebolaget Skf
Publication of WO2012107354A1 publication Critical patent/WO2012107354A1/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
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • 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
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/324—Arrangements for lubrication or cooling of the sealing itself
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K41/00—Spindle sealings
    • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
    • F16K41/08—Spindle sealings with stuffing-box ; Sealing rings with at least one ring provided with axially-protruding peripheral closing-lip

Definitions

  • Embodiments of the invention are concerned with sealing arrangements that may be used, for example, to seal a valve.
  • Seals are used in large numbers in many technical applications. In applications where the material used for sealing is in direct contact with a moving component, a high wear resistance of the sealing material is required.
  • the material of the seal in shaft seals, by means of which a rotating shaft is to be sealed with respect to a housing, the material of the seal must be resistant to wear, as considerable relative velocities between the sealing material and the surface of the shaft or of the movable component can occur.
  • Such wear-resistant sealing materials are relatively hard and inelastic.
  • seals between 2 components there is no relative movement between the sealing material, ie the material from which the seal is made, and the components to be sealed, although the components themselves can move relative to one another.
  • Examples of such seals are bellows, as used for example in motor vehicle steering or -Achs.
  • This sealing materials are used, which have a high elasticity, the wear resistance, however, for example, in view of a possible abrasion, is low.
  • the operating conditions in which the seal is to be used must also be considered. These can sometimes be very demanding.
  • an exhaust gas recirculation used in which parts of the exhaust gas are supplied to the combustion chamber again to lower the combustion temperature and thus the emission of nitrogen oxides.
  • the recirculated exhaust gas amount is regulated in a designated as exhaust gas recirculation valve arrangement by means of a valve.
  • the actuation of the valve can be done for example via a cam or an electric motor drive.
  • a seal of the valve with respect to the housing of the exhaust gas recirculation valve may be required in modern cars, as they often have sensors that report the current position of the exhaust gas recirculation valve to a central controller, so that this can use this information in the calculation of the operating parameters of the engine.
  • Wear-resistant sealing materials which are used in components that perform a relative movement to each other, so that during operation, a relative movement between the sealing material and a component occurs, so have too low flexibility or elasticity, than that they relatively large relative movements or greater Ab- Stand variations between the components to be sealed could follow.
  • Flexible sealing materials are often unusable for reasons of wear.
  • Embodiments of sealing arrangements make this possible by arranging in the case of a sealing arrangement between an inelastic support and a sealing material, which can be in contact with a component which is to be sealed relative to the sealing material, an elastic material which has a greater elasticity than the sealing material even.
  • a suitable with regard to wear sealing material can be used to ensure a high stability of the seal assembly.
  • a possible relative movement between the components to be sealed to one another can be compensated for by utilizing the elasticity of the elastic material, which in turn is supported on the inelastic carrier.
  • a suitable sealing material can be used for the wear-resistant direct contact with a movable component, whereas due to the additional elastic material it is ensured that the sealing material can follow the movements of the component in contact with the sealing material relative to the inelastic carrier or another component.
  • Embodiments of sealing arrangements can ensure the seal at high wear resistance at any time.
  • the elastic material is disposed between the sealing material and the inelastic support such that force applied to the sealing material is transferred to the inelastic support via the elastic material.
  • the elastic material is supported on the inelastic support and, due to its own elasticity, allows a relative movement between the two components to be sealed, which can also take place in a direction perpendicular to the surface of the component to be sealed.
  • a material comprising a polysiloxane is selected as the elastic material.
  • the elastic material consists in some cases of Examples of more than 50, more than 70, more than 90 or more than 95 weight percent of polysiloxane. This may have the advantage that sealing arrangements whose flexible material has polysiloxane in the scope specified above can be used in a high temperature range, for example of less than -50 ° C to more than 250 ° C, since the material in this Temperature range has a high elasticity.
  • a material comprising a polytetrafluoroethylene is used as the sealing material.
  • the sealing material in some embodiments is greater than 50, greater than 70, greater than 90, and greater than 95 weight percent polytetrafluoroethylene. This makes it possible for some embodiments to withstand high relative movements between the sealing material and the component in contact with the sealing material, since polytetrafluoroethylene (PTFE) has an extremely low coefficient of friction. In addition, it is extremely temperature stable. PTFE as a sealing material or PTFE sealing lips have a very good wear behavior with dry friction, i. So even without lubrication and are not least therefore extremely stable.
  • the inelastic support is itself formed by a housing or part of a component with respect to which a seal is to be made. This can further increase the manufacturing cost and the usability of the seal assembly.
  • a valve in an exhaust gas recirculation valve is sealed relative to the housing of the exhaust gas recirculation valve by means of an embodiment of a seal assembly comprising a sealing material comprising PTFE and an elastic material comprising polysiloxane.
  • a movable carriage is sealed by means of an embodiment of a sealing arrangement.
  • the seal assemblies are linearly expanded in only one dimension and do not completely enclose a subject to be sealed.
  • Embodiments of sealing arrangements are not based on cylin- ders
  • Seals which can be used for example for sealing shafts or rods or valve rods, limited.
  • FIG. 1 shows a sectional view of an exemplary embodiment of a sealing arrangement
  • Figure 2 is an example of a design of the sealing material of the embodiment of Figure 1
  • Figure 3 is another example of a design of the sealing material of the embodiment of Figure 1
  • FIG. 4 shows an embodiment of an exhaust gas recirculation valve.
  • FIG. 1 shows a sectional view of an exemplary embodiment of a sealing arrangement comprising an inelastic carrier 2, a sealing material 4 and an elastic material 6.
  • the elastic material 6 is disposed between and in physical contact with the inelastic support 2 and the sealing material 4, respectively.
  • a valve stem 8 of a valve with respect to a housing or a valve guide is sealed in the housing, wherein the housing itself forms the inelastic support 2 of the seal assembly.
  • the housing or the inelastic support 2 has an annular recess 10, within which the sealing material 4 and the elastic material 6 is arranged.
  • the valve stem 8 can move in and counter to an axial direction 12, ie from left to right in the figure.
  • valve stem 8 which in the present case is formed by a bore with a diameter 14, has a clearance with respect to the valve stem 8, ie if the diameter 14 of the bore is greater than the diameter of the valve stem 8, the valve stem 8 can move relative to the housing and thus move relative to the inelastic carrier 2 of the seal assembly in a radial direction 16 perpendicular to the axial direction.
  • the sealing material 4 Since the elastic material 6 is arranged in the radial direction 14 between the sealing lip or the sealing material 4 and the radial housing wall or the inelastic support 2, the sealing material 4 is pressed elastically against the valve stem 8. This allows the sealing material 4, even if this would otherwise not be possible due to its own elasticity, following an elastic deformation of the formed in the form of an O-ring elastic material 6 of a radial movement of the valve stem 8.
  • the pressing of the sealing material 4 can, in contrast to, for example, when using steel wire springs on the circumference of the sealing material, take place without high contact pressures would be required, which would increase the wear and the power losses during operation of the valve.
  • an inelastic carrier 2 is to be understood here and in the other embodiments as a carrier made of a material whose elasticity is less than the elasticity of the elastic material 6, so that upon exerting a force on the elastic material 6, the elastic material 6 deformed and not the ine- That is to say that in the radial direction 16 a force acts on the sealing material 4 which is transmitted via the elastic material 6 to the inelastic support 2, only the elastic material 6 deforms.
  • Materials for inelastic supports 2 are used For example, metals or plastics, for example, thermoplastic plastics, into consideration, which apart from their energy elasticity have no further elastic properties.
  • Figure 2 shows an embodiment of a geometric shape of the sealing material 4, as it can be used in the embodiment shown in Figure 1.
  • Figure 2 shows a section through a segment of the sealing ring or of the ring of sealing material 4 and of the ring of elastic material 6.
  • the sealing material 4 in Figure 2 has a recess 18 which can receive a lubricant to cause additional lubrication and reduction of friction in the relative movement between the sealing material 4 and the valve stem 8.
  • the recess is arranged on the side of the sealing material 4 facing away from the inelastic carrier 2, that is to say on the side of the sealing material 4 facing the valve stem 8.
  • Figure 3 shows a further embodiment of a geometric shape of the sealing material 4, in which, in addition to the recess 18, a sealing lip 20 is used, which extends from the surface of the sealing material 4 in the direction of the valve stem 10 to locally hold a grease used for lubrication and to increase the duration of lubrication or to minimize the loss of lubricant. That is, in addition to the recesses 18 in the sealing lip or the sealing material 4 grease is held locally for lubrication, with an additionally attached retaining or sealing lip 20 on the opposite side of the sealing lip of the sealing lip to increase the amount of fat to be introduced even further by adding fat to the chambers on the Valve stem 8 side facing and can be used for an initial lubrication.
  • FIG. 4 shows an embodiment of an exhaust gas recirculation valve 22 in a schematic sectional view.
  • Exhaust gas recirculation valve 22 includes a housing 24 within which is arranged a valve 26 which regulates an exhaust gas flow through exhaust gas recirculation valve 22 which can flow between an inlet 28 and an outlet 30 of exhaust gas recirculation valve 22.
  • the valve 26 is sealed by means of an embodiment of a sealing arrangement with respect to a valve seat 32, wherein in the illustrated in Figure 4 embodiment of the inelastic support 2 is formed by a part of the housing 18 of the exhaust gas recirculation valve 22.
  • the sealing material 4 and the elastic material 6 are in the embodiment shown in Fig. 4 within a recess 34 in the inelastic support 2 forming housing 24.
  • the elastic material 6 may also be supported on the valve stem, which in case of defect Replacement of the seal assembly together with the valve 26 can allow.
  • a filled PTFE is used as the sealing material Material used.
  • an O-ring made of a silicone or a polysiloxane is used as the elastic material, so that during all operating conditions and temperatures, that is, e.g. between -40 ° C and 200 ° C, the housing passage of the valve stem can be sealed against passing gas and any condensate occurring in order to avoid disturbances and defective adjacent components, which may be located, for example, on the side facing away from the exhaust chamber 26 of the valve.
  • a valve position sensor 36 is shown schematically in FIG.
  • sealing arrangements have been described which seal a housing or a component with respect to a cylindrical shaft
  • further embodiments of Sealing arrangements can be used to non-rotationally symmetrical, for example, rectangular components, as well as waves arbitrary, for example, elliptical cross-section, seal.
  • other embodiments of sealing arrangements can be used which do not completely enclose a component, but for example extend linearly in one direction.
  • the sealing material may, for example, rest on one side of a table of a press or similar device from one side to achieve a seal between two linearly movable elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

L'invention concerne un système de joint comportant un support inélastique (2) et un matériau joint (4). Un matériau élastique (6) présentant une élasticité supérieure à celle du matériau joint (4) est disposé entre le support inélastique (2) et le matériau joint.
PCT/EP2012/051813 2011-02-08 2012-02-03 Système de joint WO2012107354A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011003744.6 2011-02-08
DE102011003744A DE102011003744A1 (de) 2011-02-08 2011-02-08 Dichtungsanordnung

Publications (1)

Publication Number Publication Date
WO2012107354A1 true WO2012107354A1 (fr) 2012-08-16

Family

ID=45567011

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/051813 WO2012107354A1 (fr) 2011-02-08 2012-02-03 Système de joint

Country Status (2)

Country Link
DE (1) DE102011003744A1 (fr)
WO (1) WO2012107354A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103821509A (zh) * 2014-02-26 2014-05-28 南通市飞宇石油科技开发有限公司 高温高压地层流体分析仪的柱塞密封机构
CN106802216A (zh) * 2017-03-31 2017-06-06 上汽通用五菱汽车股份有限公司 一种试漏机弹性封堵

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1299229B (de) * 1967-01-18 1969-07-10 Draegerwerk Ag Absperrventil fuer Atemschutzgeraet
DE2334023A1 (de) * 1973-07-04 1975-01-30 Freudenberg Carl Fa Drehvakuumdichtring
DE3736644A1 (de) * 1987-10-29 1989-05-11 Apv Rosista Gmbh Dichtungsvorrichtung fuer einen in achsialer richtung verschiebbaren ventilschaft
DE3819114A1 (de) * 1988-06-04 1989-12-14 Wilhelm Chr Dr Buck Betaetigungsvorrichtung fuer eine verstellbare ventilspindel
US20100242927A1 (en) * 2009-03-30 2010-09-30 Saint-Gobain Performance Plastics Pampus Gmbh Seal ring for exhaust gas recirculation system

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
DE7212905U (de) * 1972-07-20 Schneider + Co Ag Dichtungseinrichtung
DE3835505A1 (de) * 1988-10-19 1990-05-03 Ammann Siegfried Abdichtung fuer hin- und hergehende kolben, plunger, stangen, zylinder und stangenlager
DE4140833C3 (de) * 1991-04-30 1995-03-16 Busak & Luyken Gmbh & Co Dichtungsanordnung
DE19739472A1 (de) * 1997-09-09 1999-03-18 Freudenberg Carl Fa Dichtungsanordnung
DE19819559A1 (de) * 1998-04-30 1999-11-11 Cr Elastomere Gmbh Ventilschaftabdichtung
DE10054637C1 (de) * 2000-11-03 2002-06-27 Freudenberg Carl Kg Kolben oder Stangendichtung
DE10117662C1 (de) * 2001-04-09 2003-01-16 Freudenberg Carl Kg Stangen- oder Kolbenprimärdichtung
DE202005021162U1 (de) * 2005-04-20 2007-04-12 Freudenberg Carl Kg Reibungsarme Dichtung
US20080203672A1 (en) * 2007-02-28 2008-08-28 National Coupling Company, Inc. Pressure-energized shaft seal
DE102008031813B4 (de) * 2008-06-26 2015-10-22 Parker Hannifin Gmbh Dichtungsanordnung mit Profildichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1299229B (de) * 1967-01-18 1969-07-10 Draegerwerk Ag Absperrventil fuer Atemschutzgeraet
DE2334023A1 (de) * 1973-07-04 1975-01-30 Freudenberg Carl Fa Drehvakuumdichtring
DE3736644A1 (de) * 1987-10-29 1989-05-11 Apv Rosista Gmbh Dichtungsvorrichtung fuer einen in achsialer richtung verschiebbaren ventilschaft
DE3819114A1 (de) * 1988-06-04 1989-12-14 Wilhelm Chr Dr Buck Betaetigungsvorrichtung fuer eine verstellbare ventilspindel
US20100242927A1 (en) * 2009-03-30 2010-09-30 Saint-Gobain Performance Plastics Pampus Gmbh Seal ring for exhaust gas recirculation system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103821509A (zh) * 2014-02-26 2014-05-28 南通市飞宇石油科技开发有限公司 高温高压地层流体分析仪的柱塞密封机构
CN106802216A (zh) * 2017-03-31 2017-06-06 上汽通用五菱汽车股份有限公司 一种试漏机弹性封堵
CN106802216B (zh) * 2017-03-31 2023-09-15 上汽通用五菱汽车股份有限公司 一种试漏机弹性封堵

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