WO2004018907A1 - Gleitringdichtungsanordnung - Google Patents
GleitringdichtungsanordnungInfo
- Publication number
- WO2004018907A1 WO2004018907A1 PCT/EP2003/009014 EP0309014W WO2004018907A1 WO 2004018907 A1 WO2004018907 A1 WO 2004018907A1 EP 0309014 W EP0309014 W EP 0309014W WO 2004018907 A1 WO2004018907 A1 WO 2004018907A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sic
- seal arrangement
- rings
- graphite
- mechanical seal
- Prior art date
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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials
Definitions
- the invention relates to a mechanical seal arrangement according to the preamble of claim 1. It relates in particular to a mechanical seal arrangement with a self-lubricating property for use in sealing liquid or gaseous media.
- a special area of application of a mechanical seal arrangement according to the invention is the sealing of the drive shafts of CO 2 compressors for air conditioning systems of motor vehicles.
- a basic requirement for the mechanical seal arrangement is a long service life with a minimal leakage rate under the prevailing operating conditions, which are characterized in particular by high pressures of the medium to be sealed (CO 2 -OEI mixture).
- Common e.g.
- EP-A-1 098 117 is in the case of mechanical ring pairings in which one of the mechanical rings, for reasons of improved wear resistance and good thermal conductivity, consists of a silicon carbide (SiC) material which has been brought into a desired shape by a sintering process, the other interacting therewith Slide ring made of a material with good sliding properties such as graphite in order to obtain a self-lubricating property on the interacting sealing surfaces of the slide rings.
- the disadvantage of slide rings made of pure graphite is their low dimensional stability under the forces due to the low modulus of elasticity of graphite, so that these slide rings can easily deform and warp, which not only increases leakage, but also increases wear on the sealing surfaces Have consequence.
- the invention has for its object to provide a mechanical seal assembly of the generic type, in which the sealing surfaces of the interacting slide rings can come into contact with each other during operation in contacting sealing engagement, which have improved wear and operating behavior and thus a longer life and are particularly suitable for use in CO 2 refrigeration compressors for automotive air conditioning systems.
- At least one of the interacting slide rings consists of an SiC-graphite composite material, in which the graphite component in particulate form with a comparatively low proportion of only between 1.0 and 4.0% by volume in an SiC crystal containing a certain grain size SiC base material is provided.
- the other slide ring can be formed from a conventional SiC material.
- the graphite composite material is preferably provided for both slide rings.
- the mechanical seal arrangement is characterized by a high level of leak protection. For example, a practically negligible leakage of oil with an oil / CO 2 mixture as the medium to be sealed was found over long operating times, while the leakage of CO 2 always remained well below the permissible limits.
- the housing of a piece of equipment to be sealed for example a refrigerant compressor for compressing a refrigerant, such as CO 2
- a refrigerant compressor for compressing a refrigerant, such as CO 2
- 2 denotes a shaft guided through a housing bore 3, for example a compressor drive shaft.
- a mechanical seal arrangement is provided in order to seal the shaft 2 with respect to the housing bore 3.
- the invention is not limited to the aforementioned use in refrigerant compressors or to a special configuration of the mechanical seal arrangement, which is explained in more detail below.
- the mechanical seal arrangement comprises a pair of interacting slide rings 4, 5, of which the slide ring 4 for rotationally fixed mounting on the housing 1 and the slide ring 5 is provided for common rotation with the shaft 2.
- An O-ring 6 can be inserted in a groove on the outer circumference of the rotationally fixed slide ring 4 in order to seal the rotationally fixed slide ring 4 with respect to the housing bore 3.
- the sliding ring 5 rotating with the shaft 2 can contain an axial recess 7 in its peripheral surface facing the shaft 2, in which an O-ring 8 is inserted, which creates a seal between the rotating sliding ring 5 and the shaft 2.
- the slide rings 4, 5 have mutually facing radial sealing surfaces 9, 10, which are held in sealing engagement with one another by a rotating slide ring 5 with an axial biasing force against the rotationally fixed slide ring 4 biasing device 11.
- the pretensioning device 11 can comprise a plate or helical spring, which is supported with an axial end on a support ring 12 fastened to the rotating slide ring 5 by means of a clip 13.
- the support ring 12 can cover the outer axial end of the recess 7 receiving the O-ring 8, so that the O-ring 8 is prevented from coming out of the recess 7.
- both slide rings 4, 5 are formed from a material containing silicon carbide (SiC).
- SiC silicon carbide
- this material has a high inherent rigidity, good wear resistance, good heat resistance and high thermal conductivity.
- a graphite component with a certain proportion is added to the SiC base material in order to obtain a self-lubricating property or to generate a lubricating film between the sealing surfaces 9, 10 which are in engagement with one another during operation.
- the SiC base material should be composed of platelet-shaped SiC crystals with a certain grain size or at least a certain proportion of such coarse-grain SiC crystals should be contained in a fine-grain SiC matrix material. This gives the SiC base material a certain suitable porosity, which can be, for example, about 2% by volume in order to create pores for the accommodation of a graphite component. A pore size between 30 and 150 ⁇ m is preferred.
- the maximum expansion of the SiC crystals should be between 5 and 1500 ⁇ m, preferably 10 and 1000 ⁇ m. Suitable techniques for growing such SiC crystals are known to the person skilled in the art and therefore do not require any further explanation at this point.
- the proportion of the graphite component in the SiC base material is between 1.0 and 4.0% by volume, preferably 1, 5 and 3.0% by volume, most preferably 1, 8 and 2.5% by volume.
- the graphite component could be limited to a cross-sectional area close to the sealing surfaces 9, 10, while the other cross-sectional areas of the slide rings 4, 5 could be essentially graphite-free, the simple shaping of the slide rings 4, 5 results in a uniform distribution of the graphite component over the whole Ring cross-section preferred.
- the size of the graphite particles should be between 20 and 200 ⁇ m, preferably 40 and 150 ⁇ m, most preferably 50 and 120 ⁇ m.
- the sealing surfaces 9, 10 of the slide rings 4, 5 with the aforementioned inner structure are machined to a roughness measure R k in the range from 0.05 to 0.4 ⁇ m using known smoothing techniques, such as grinding, lapping. Further advantageous ranges for the roughness measure are: 0.1 to 0.4 ⁇ m and 0.15 to 0.3 ⁇ m. Most preferably the roughness measure between 0.2 and 0.25 ⁇ m.
- R k for a more detailed definition of the roughness measure R k and methods for determining it, reference can be made to DIN standard 13565.
- Known techniques can be used to manufacture slide rings from the aforementioned SiC graphite composite material.
- One such technique is to mix and add SiC grains containing at least a portion of SiC crystals of the aforementioned size and grahite particles with the aforementioned portion, optionally with the addition of a suitable sintering aid such as boron or aluminum to compress or compress a shape corresponding to the desired slide ring configuration.
- the pressing obtained is then heated in an oven to a suitably high temperature at which the SiC grains sinter or "bake together" to form a porous microstructure, the pores filling with free garphite particles.
- the size of the pores depends, inter alia, on the Size of the SiC crystals used in the granular starting mixture, which, as mentioned above, should be between 5 and 1500 ⁇ m, preferably 10 and 1000 ⁇ m.
- a mechanical seal arrangement with a structure as shown in the drawing for sealing a shaft with a nominal diameter of 13 mm comprised a pair of mechanical seals according to the invention made of a SiC graphite composite material with the following parameters:
- Particle-sized graphite varying between 50 and 120 [ ⁇ m]
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003258610A AU2003258610A1 (en) | 2002-08-21 | 2003-08-14 | Slip-ring seal arrangement |
EP03792315A EP1554512A1 (de) | 2002-08-21 | 2003-08-14 | Gleitringdichtungsanordnung |
US10/524,914 US20060119049A1 (en) | 2002-08-21 | 2003-08-14 | Slip-ring seal arrangement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE20212848.2 | 2002-08-21 | ||
DE20212848U DE20212848U1 (de) | 2002-08-21 | 2002-08-21 | Gleitringdichtungsanordnung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004018907A1 true WO2004018907A1 (de) | 2004-03-04 |
Family
ID=7974298
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/009014 WO2004018907A1 (de) | 2002-08-21 | 2003-08-14 | Gleitringdichtungsanordnung |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060119049A1 (de) |
EP (1) | EP1554512A1 (de) |
AU (1) | AU2003258610A1 (de) |
DE (1) | DE20212848U1 (de) |
WO (1) | WO2004018907A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20311346U1 (de) * | 2003-07-23 | 2003-10-02 | Burgmann Dichtungswerke GmbH & Co. KG, 82515 Wolfratshausen | Zur gemeinsamen Drehung mit einer Triebwerkswelle ausgelegter Gleitring einer Gleitringdichtungsanordnung für Strahltriebwerke |
DE102005033707A1 (de) * | 2005-07-19 | 2007-02-01 | Valeo Compressor Europe Gmbh | Vereinfachte, innenbeaufschlagte Axialgleitringdichtung für die CO2-Anwendung |
US7878757B2 (en) * | 2007-03-16 | 2011-02-01 | VRC, Inc | Centrifugal water pump |
DE102008056959A1 (de) * | 2008-10-31 | 2010-05-06 | Ixetic Mac Gmbh | Gleitringdichtung, insbesondere für CO2-Kompressoren |
US20110121518A1 (en) * | 2009-11-25 | 2011-05-26 | CHAIR MAN HI-TECH Co., Ltd. | Silicon carbide mechanical seal |
US20140131952A1 (en) * | 2012-11-15 | 2014-05-15 | Caterpillar Global Mining Llc | Adjustable face seal assembly |
JP6059008B2 (ja) * | 2012-12-27 | 2017-01-11 | 京セラ株式会社 | 回転継手 |
US20140319780A1 (en) * | 2013-04-24 | 2014-10-30 | Caterpillar Inc. | Use of dissimilar metals in floating style seals |
DE102014205297A1 (de) * | 2014-03-21 | 2015-09-24 | Eagleburgmann Germany Gmbh & Co. Kg | Graphenhaltiger Gleitring |
DE102014205300A1 (de) * | 2014-03-21 | 2015-10-08 | Eagleburgmann Germany Gmbh & Co. Kg | Gleitringdichtungsanordnung mit graphenhaltigem Schmiermedium |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4690909A (en) * | 1982-12-06 | 1987-09-01 | Ngk Spark Plug Co., Ltd. | Silicon carbide-graphite composite material and process for producing same |
EP0900959A2 (de) | 1997-09-06 | 1999-03-10 | John Crane Uk Limited | Gleitringdichtung |
EP1098117A1 (de) | 1999-04-23 | 2001-05-09 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Gleitringdichtung für kompressor |
EP1205695A2 (de) | 2000-11-13 | 2002-05-15 | Carl Freudenberg KG | Gleitringdichtung |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3601413A (en) * | 1969-07-18 | 1971-08-24 | Texas Instruments Inc | Mechanical seal |
US4036505A (en) * | 1973-12-06 | 1977-07-19 | The Wickes Corporation | Mechanical seals |
DE3745037C2 (de) | 1986-10-28 | 1997-01-30 | Pacific Wietz Gmbh & Co Kg | Gasgesperrte, kontaktlose Dichtungsanordnung für eine Welle mit Dichtungsgehäuse |
DE3810820A1 (de) | 1988-03-30 | 1989-10-12 | Hoechst Ceram Tec Ag | Verfahren zur herstellung von gleitkoerpern mit hohlkammern |
JPH0255273A (ja) * | 1988-08-18 | 1990-02-23 | Showa Denko Kk | メカニカルシール用炭化珪素焼結体およびそれを用いたメカニカルシール |
US4942145A (en) * | 1989-05-26 | 1990-07-17 | Ethyl Corporation | Preceramic compositions and ceramic products |
US5395807A (en) | 1992-07-08 | 1995-03-07 | The Carborundum Company | Process for making silicon carbide with controlled porosity |
DE4419243A1 (de) | 1994-06-01 | 1995-12-07 | Kempten Elektroschmelz Gmbh | Gleitwerkstoff aus porösem SiC mit trimodaler Porenzusammensetzung |
US5486496A (en) * | 1994-06-10 | 1996-01-23 | Alumina Ceramics Co. (Aci) | Graphite-loaded silicon carbide |
DE10045339A1 (de) * | 2000-09-14 | 2002-04-04 | Wacker Chemie Gmbh | Mit Grafit beschichteter Formkörper aus gesintertem Siliciumcarbid |
DE10111225A1 (de) | 2001-03-08 | 2002-09-19 | Wacker Chemie Gmbh | Verbundwerkstoff auf der Basis von Siliciumcarbid und Kohlenstoff, Verfahren zu seiner Herstellung sowie seine Verwendung |
DE20120966U1 (de) | 2001-12-27 | 2002-03-28 | Burgmann Dichtungswerke GmbH & Co. KG, 82515 Wolfratshausen | Gleitringdichtungsanordnung |
-
2002
- 2002-08-21 DE DE20212848U patent/DE20212848U1/de not_active Expired - Lifetime
-
2003
- 2003-08-14 AU AU2003258610A patent/AU2003258610A1/en not_active Abandoned
- 2003-08-14 US US10/524,914 patent/US20060119049A1/en not_active Abandoned
- 2003-08-14 EP EP03792315A patent/EP1554512A1/de not_active Withdrawn
- 2003-08-14 WO PCT/EP2003/009014 patent/WO2004018907A1/de not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4690909A (en) * | 1982-12-06 | 1987-09-01 | Ngk Spark Plug Co., Ltd. | Silicon carbide-graphite composite material and process for producing same |
EP0900959A2 (de) | 1997-09-06 | 1999-03-10 | John Crane Uk Limited | Gleitringdichtung |
EP1098117A1 (de) | 1999-04-23 | 2001-05-09 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Gleitringdichtung für kompressor |
EP1205695A2 (de) | 2000-11-13 | 2002-05-15 | Carl Freudenberg KG | Gleitringdichtung |
Also Published As
Publication number | Publication date |
---|---|
DE20212848U1 (de) | 2002-10-31 |
US20060119049A1 (en) | 2006-06-08 |
EP1554512A1 (de) | 2005-07-20 |
AU2003258610A1 (en) | 2004-03-11 |
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