WO2010130694A1 - Feuille de graphite pour joints de presse-étoupe - Google Patents

Feuille de graphite pour joints de presse-étoupe Download PDF

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Publication number
WO2010130694A1
WO2010130694A1 PCT/EP2010/056385 EP2010056385W WO2010130694A1 WO 2010130694 A1 WO2010130694 A1 WO 2010130694A1 EP 2010056385 W EP2010056385 W EP 2010056385W WO 2010130694 A1 WO2010130694 A1 WO 2010130694A1
Authority
WO
WIPO (PCT)
Prior art keywords
graphite
glass former
glass
stuffing box
boron nitride
Prior art date
Application number
PCT/EP2010/056385
Other languages
German (de)
English (en)
Inventor
Martin Christ
Rainer Schmitt
Robert Michels
Roland Mittelhammer
Original Assignee
Sgl Carbon Se
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 Sgl Carbon Se filed Critical Sgl Carbon Se
Priority to JP2012510249A priority Critical patent/JP2012526255A/ja
Priority to EP10718597A priority patent/EP2430336A1/fr
Publication of WO2010130694A1 publication Critical patent/WO2010130694A1/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
    • F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
    • F16J15/30—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings with sealing rings made of carbon
    • 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
    • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
    • F16J15/20—Packing materials therefor

Definitions

  • the invention relates to a graphite foil, in particular for stuffing box packings.
  • a stuffing box seals a rotating shaft or reciprocating rod from a housing against an applied liquid or vapor pressure.
  • Stuffing box packings are usually used to seal valve spindles.
  • a high surface pressure is required, which, however, generates undesirably high frictional forces. These high frictional forces cause wear and thus an increased leakage rate.
  • a stuffing box consists of the stuffing box packing as the actual seal and a stuffing box gland (a flange-like sleeve), with which the stuffing box packing is axially pressed by means of screws and / or springs.
  • the axial pressure also creates a radial compression of the stuffing box packing on the shaft.
  • the large contact area associated with a high pressure, which is necessary for leak-tight sealing, stuffing box packings have relatively much friction.
  • Such a gland packing is usually a rope-like textile or textile-like sealing material which results in packing rings deformed and inserted into a stuffing box bore. Subsequently, the packing rings are clamped by means of a stuffing box gland, which press on two Klamm ceremoniessringe, which in turn enclose the packing rings, so that the pack is pressed into the socket space and the sealing point is closed.
  • graphite Since a sealing pressure is achieved via the stuffing box gland, no self-elasticity of the sealing material is necessary with a stuffing box. Therefore, graphite, with its good friction properties and its compressibility, is often used as a stuffing box material. In addition, graphite has the advantage of being usable at high temperatures.
  • the graphite is conventionally used as graphite foil. This is usually produced by expansion of graphite by means of acid and temperature action and subsequent recompression.
  • Object of the present invention is to provide a material for a stuffing box pack, which has a high density, low friction, high temperature resistance, long shelf life in use and very constant friction and sealing properties.
  • Boron nitride presumably not only acts as a lubricant, but also covers the melting and thereby adhering glass-forming agent superficially, so that adhesion of the glass-forming agent to a spindle is completely avoided.
  • the desired sealing effect of the glass former can unfold inside the graphite, by the open porosity is closed by a flow of the glass former into the pores and cavities of the graphite.
  • An undesired external adhesion is prevented by the boron nitride.
  • the boron nitride also has the effect of greatly reducing the friction against a spindle as a solid lubricant.
  • the oxidation resistance of the packing material is additionally improved.
  • the glass former and / or precursor of the glass former is at least one member selected from the group consisting of phosphates such as ammonium dihydrogen phosphate, polyphosphate, hydrogrenophosphate and polyphosphoric acid, silicates, aluminosilicates, boron oxide and borates or a mixture thereof.
  • phosphates such as ammonium dihydrogen phosphate, polyphosphate, hydrogrenophosphate and polyphosphoric acid
  • silicates such as ammonium dihydrogen phosphate, polyphosphate, hydrogrenophosphate and polyphosphoric acid
  • silicates such as silicates, aluminosilicates, boron oxide and borates or a mixture thereof.
  • the glass former comes from an ash content of graphite, which was used to produce the graphite foil according to the invention.
  • Ash content of the graphite can thus be taken into account specifically in a stoichiometric calculation of a desired inventive composition of the film.
  • the ash of the graphite provides only a certain proportion of the glass former, wherein the remaining portion of the glass former is added during manufacture.
  • the graphite foil has, instead or in addition, at least one precursor of glass images, which only converts to a glass former during heating of the graphite packing.
  • the graphite foil has, instead or in addition, at least one precursor of glass images, which only converts to a glass former during heating of the graphite packing.
  • An ash component present in the graphite can advantageously also provide at least one precursor of a glass former.
  • an ash portion may also have a mixture of at least one precursor and at least one glass former.
  • Boron nitride is advantageously present at from 5 to 20% by weight, in particular from 8 to 12% by weight, based on 100% graphite. This area shows a particularly good lubricating effect. On the other hand, the still low proportion of BN barely disturbs the structure of the graphite and thus its further properties, such as mechanical strength.
  • the glass former based on 100% graphite, to 1 to 12 wt .-%, in particular 2 to 5 wt .-% is included. In this area shows a particularly good sealing effect.
  • the structure of the graphite and thus its further properties, such as mechanical strength, are hardly disturbed by the still low proportion of glass formers.
  • the object is further achieved with a stuffing box pack containing a graphite foil according to the invention.
  • a stuffing box pack containing a graphite foil according to the invention.
  • graphite expandate was prepared by acid and temperature treatment, as previously known. This graphite expander was mixed with various amounts of additives and mixed manually for 10 minutes. The same procedure was followed for comparative experiments, but adding without additives. The resulting mixture was filled in a pre-compressor and pressed to a thickness of 10 mm. The resulting pre-compact was compacted on a calender in several steps to a final thickness of 0.50 mm. The basis weight of the resulting films was 350 g / m 2 each.
  • the respectively obtained graphite foil was cut into 25 mm wide strips and these strips were aged for 5 minutes at 300 ° C. in a circulating air oven.
  • the strips were each weighed 15.4 g, wound around a 40 mm outer diameter core, and then pressed into a 56 mm inner diameter 56 mm hollow cylinder at a pressure of 56 x 40 x 8 mm (outer diameter x inner diameter x height) ,
  • the density of the packages thus produced was 1.6 g / cm 3 in each case.
  • four of the rings thus produced were produced by stacking.
  • P1 represents a comparative sample containing neither BN nor glass former.
  • P2 contains 10% BN and no glass former, P3 10%
  • Ammonium dihydrogen phosphate (NH 4 NH 2 PO 4 ) as a glass former and no BN.
  • P4 and P5 contain both BN and ammonium dihydrogen phosphate.
  • the leakage rate of the samples was measured at room temperature, then the package together with spindle heated to 400 0 C and measured again the leakage. Thereupon 500 spindle lifting cycles were carried out and again the leakage was measured. During cycling, the spindle was reciprocated at a stroke of 40 mm. Thereafter, another 2500 cycles were performed and again the leakage was measured.
  • Tab. 2 represents the leakage rates of the various graphite packages according to the individual above-mentioned experimental steps.
  • Sample P1 which contains no additive, exhibits a leak tightness at room temperature equal to that of sample P5.
  • P4 has about twice as bad tightness as P1. This shows that the additives BN and ammonium dihydrogen phosphate at room temperature have no positive effect, since the glass former does not melt yet.
  • P3 which contains glass formers, but no boron nitride, is completely destroyed even before reaching 3000 cycles due to sticking to the spindle and tearing.
  • P4 and P5 are the only samples that both stabilize at a leak rate value and have a low absolute value.
  • P4 and P5 at 5.9 ⁇ 10 -2 mbar-1 / (sm) and 3.0 ⁇ 10 -2 mbar-1 / (sm) after a total of 3000 cycles show the surprising effect according to the invention that the combination of BN and Ammonium dihydrogen phosphate as a glass former, each of which (see P2 and P3) does not lead to a satisfactory result in terms of tightness, a very good tightness at 400 0 C causes even after a high Zkylenaniere a spindle stroke.
  • the samples are clamped on the spindle, which is placed in a stuffing box, in the axial direction with 30 MPa surface pressure. After reaching the tension during the clamping process, the stuffing box gland is fixed. In this condition, the stuffing box gland experiences backpressure from the stuffing box pack of 30 MPa.
  • the surface pressure remains relatively constant at a high level until the end of the cycling with 3000 cycles. Due to the lack of glass former, which melts under volume shrinkage or at least flows or sinters, there was hardly any decrease in the surface pressure.

Abstract

L'invention concerne une feuille en graphite expansé et au moins partiellement recomprimé, notamment destinée à des joints de presse-étoupe, la feuille selon l'invention contenant du nitrure de bore et au moins un agent vitrifiant.
PCT/EP2010/056385 2009-05-10 2010-05-10 Feuille de graphite pour joints de presse-étoupe WO2010130694A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2012510249A JP2012526255A (ja) 2009-05-10 2010-05-10 スタッフィングボックスパッキン用の黒鉛シート
EP10718597A EP2430336A1 (fr) 2009-05-10 2010-05-10 Feuille de graphite pour joints de presse-étoupe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009020678.7 2009-05-10
DE200910020678 DE102009020678A1 (de) 2009-05-10 2009-05-10 Graphitfolie für Stopfbuchspackungen

Publications (1)

Publication Number Publication Date
WO2010130694A1 true WO2010130694A1 (fr) 2010-11-18

Family

ID=42621597

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/056385 WO2010130694A1 (fr) 2009-05-10 2010-05-10 Feuille de graphite pour joints de presse-étoupe

Country Status (4)

Country Link
EP (1) EP2430336A1 (fr)
JP (1) JP2012526255A (fr)
DE (1) DE102009020678A1 (fr)
WO (1) WO2010130694A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009055444A1 (de) * 2009-12-31 2011-07-07 Sgl Carbon Se, 65203 Graphithaltiger Formkörper und Verfahren zu seiner Herstellung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494382A (en) * 1962-03-21 1970-02-10 Union Carbide Corp Chemical products and processes
US3627551A (en) * 1965-03-22 1971-12-14 Dow Chemical Co Forms of graphite
JPH09222143A (ja) * 1996-02-16 1997-08-26 Toshiba Tungaloy Co Ltd 鱗片状黒鉛添加焼結摩擦材料の製造方法
EP1146262A1 (fr) * 1999-09-28 2001-10-17 Oiles Corporation Element d'etancheite a zone spherique et procede de fabrication correspondant
DE102005043542A1 (de) * 2005-09-13 2007-03-15 Graphit Kropfmühl AG Stabile wässrige Graphitdispersion mit hohem Feststoffgehalt

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61143483A (ja) * 1984-12-17 1986-07-01 Nippon Pillar Packing Co Ltd 可撓性黒鉛編組パツキン
JP4264802B2 (ja) * 2002-09-04 2009-05-20 東洋炭素株式会社 膨張黒鉛成形体及びその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494382A (en) * 1962-03-21 1970-02-10 Union Carbide Corp Chemical products and processes
US3627551A (en) * 1965-03-22 1971-12-14 Dow Chemical Co Forms of graphite
JPH09222143A (ja) * 1996-02-16 1997-08-26 Toshiba Tungaloy Co Ltd 鱗片状黒鉛添加焼結摩擦材料の製造方法
EP1146262A1 (fr) * 1999-09-28 2001-10-17 Oiles Corporation Element d'etancheite a zone spherique et procede de fabrication correspondant
DE102005043542A1 (de) * 2005-09-13 2007-03-15 Graphit Kropfmühl AG Stabile wässrige Graphitdispersion mit hohem Feststoffgehalt

Also Published As

Publication number Publication date
DE102009020678A1 (de) 2010-11-18
EP2430336A1 (fr) 2012-03-21
JP2012526255A (ja) 2012-10-25

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