WO2013160077A1 - Bague d'étanchéité et capteur de pression muni de ladite bague d'étanchéité - Google Patents

Bague d'étanchéité et capteur de pression muni de ladite bague d'étanchéité Download PDF

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Publication number
WO2013160077A1
WO2013160077A1 PCT/EP2013/057062 EP2013057062W WO2013160077A1 WO 2013160077 A1 WO2013160077 A1 WO 2013160077A1 EP 2013057062 W EP2013057062 W EP 2013057062W WO 2013160077 A1 WO2013160077 A1 WO 2013160077A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing ring
sealing
less
sealing surface
pressure
Prior art date
Application number
PCT/EP2013/057062
Other languages
German (de)
English (en)
Inventor
Olaf Textor
Original Assignee
Endress+Hauser Gmbh+Co. Kg
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 Endress+Hauser Gmbh+Co. Kg filed Critical Endress+Hauser Gmbh+Co. Kg
Publication of WO2013160077A1 publication Critical patent/WO2013160077A1/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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
    • F16J15/0887—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing the sealing effect being obtained by elastic deformation of the packing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0007—Fluidic connecting means
    • G01L19/0046—Fluidic connecting means using isolation membranes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0672—Leakage or rupture protection or detection
    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
    • F16J15/0818—Flat gaskets
    • F16J2015/0862—Flat gaskets with a bore ring

Definitions

  • the present invention relates to a sealing ring and a pressure transducer with at least one such sealing ring.
  • the sealing ring according to the invention for sealing in the axially clamped state comprises a metallic annular body having a first sealing surface on a first end side of the annular body and a second sealing surface on a second end side the annular body facing away from the first end face; wherein the first sealing surface in the relaxed state of the sealing ring in an inner edge region of the annular body in a first axial direction protrudes furthest; wherein the second sealing surface in the relaxed state of the sealing ring in an outer edge region of the annular body in one of the first axial direction
  • first sealing surface comprises a non-metallic sealing material
  • second sealing surface comprises a non-metallic sealing material
  • dz not less than 2% of the radial strength of the annular body, in particular not Less than 3% of the radial strength of the ring body, and preferably not less than 4% of the radial strength of the ring body, after relaxation of the axial clamping has a relaxation of at least 0.3 dz.
  • the radial thickness of the sealing ring is not less than 2%, in particular not less than 3% and preferably not less than 3.5% of the mean diameter of the sealing ring. According to one embodiment of the invention, the radial thickness of the sealing ring is not more than 10%, in particular not more than 8% and preferably not more than 7% of the mean diameter of the sealing ring.
  • the mean diameter is defined as (d a + dj) / 2, where d a and d denote
  • the average axial thickness of the sealing ring is not more than three times, in particular not more than twice, preferably not more than five thirds and more preferably not more than three-quarters of the radial thickness of the sealing ring.
  • the radial strength of the sealing ring is defined as (d a - dj) / 2,
  • the average axial thickness of the sealing ring is not less than half, in particular not less than two-thirds, preferably not less than the simple and particularly preferably not less than four-thirds radial thickness of the sealing ring.
  • the first sealing surface has a first macroscopic contour, which increases monotonically from the outer edge region of the first sealing surface to the axially projecting portion in the inner edge region of the first sealing surface, wherein the second sealing surface has a second macroscopic contour of the inner edge region of the second
  • the first sealing surface has a first macroscopic contour, which substantially corresponds to an annular portion of a conical surface, wherein the second sealing surface is a second
  • the annular body has a in
  • the sides of the parallelogram which are defined by the sealing surfaces, an inclination of not less than 0.5 °, in particular not less than 1 °, and preferably not less than 1, 3 ° relative to a plane, which is perpendicular to the maximum principal axis of inertia of the sealing ring.
  • the sides of the parallelogram, which are defined by the sealing surfaces have an inclination of not more than 4 °, in particular not more than 3 °, and preferably not more than 2 ° relative to a plane perpendicular to the maximum principal axis of inertia of the sealing ring runs.
  • At least one of the sealing surfaces preferably each of the sealing surfaces in the cross section of the annular body a
  • Cross-section rounded edge regions whose radius of curvature is not more than 0.5 mm, preferably not less than 0.3 mm.
  • the non-metallic sealing material comprises a fluorine polymer, in particular PTFE or PFA, preferably in a mean thickness of not less than 20 ⁇ m and not more than 100 ⁇ m.
  • the average thickness is not less than about 30 ⁇ not more than about 50 ⁇ , in particular about 35 ⁇ to 45 ⁇ .
  • the PTFE can in particular - after appropriate cleaning and possibly
  • Plasma treatment of the surfaces of the ring body are applied as a suspension and solidified by sintering. Such coatings are
  • the pressure measuring transducer comprises a hydraulic measuring mechanism, which has a measuring mechanism body and at least one first separating membrane, which is connected to the measuring mechanism body along a circumferential joint and can be acted upon by a medium, the separating diaphragm being in its
  • Edge region has an annular Trennmembrandicht Design; wherein the pressure measuring transducer further comprises at least one Prozeßan gleichkorper, wherein the Prozeßan gleichkorper has a pressure output port through which the separation membrane is acted upon by the medium, wherein the
  • Pressure outlet opening is annularly surrounded by a first process connection body sealing surface; wherein the pressure measuring transducer further comprises at least one sealing ring according to the invention, wherein the sealing ring between the first separation membrane sealing surface and the first process connection body sealing surface is axially clamped.
  • the sealing ring is axially clamped in the main circuit.
  • the pressure measuring transducer according to the invention comprises a measuring transducer which is located in a transducer chamber in the transducer
  • Messtechnik Congress arranged and via a hydraulic path, with the pressure applied to the separation membrane pressure can be acted upon.
  • the sealing ring due to the axial clamping an axial compression dz, not less than 2%
  • the axial compression dz not more than 10%, in particular not more than 8% and preferably not less than 7% of the axial strength of the metallic Ring body is.
  • the sealing ring is axially clamped in such a way that the non-metallic sealing material over a
  • the sealing ring with such
  • the pressure transducer is a
  • Differential pressure sensor for detecting the difference between a first media pressure and a second media pressure, which except the first
  • Separation membrane having a second separation membrane, which can be acted upon by a medium, and having a second annular Trennmembrandicht Structure; wherein the Differenz horrmessaufnado further comprises a second process connection body, a second pressure outlet opening, through which the second
  • Separating membrane can be acted upon with a medium, wherein the second
  • Pressure output surface is annularly surrounded by a second process connection body sealing surface; wherein the Differenz horrmessaufillon further comprises a second sealing ring according to the invention, wherein the second sealing ring between the second Trennmembrandicht composition and the second
  • Process connection body sealing surface is axially clamped, wherein the Differential pressure sensor has a differential pressure transducer, which is further acted upon by the upcoming at the two separation membranes media pressures to determine their difference.
  • the measuring element body is axially clamped between the first process connection body and the second process connection body.
  • FIG. 1 shows a longitudinal section through an embodiment of a
  • FIG. 3 shows a longitudinal section through an embodiment of a
  • a sealing ring 1 according to the invention comprises a metallic annular body 10 made of corrosion-resistant stainless steel.
  • the sealing ring has an outside diameter of about 5 cm.
  • Inner diameter is about 6 mm smaller.
  • the axial strength of the annular body 10 in the axial direction, ie the maximum distance in the axial direction between the top and the bottom of the sealing ring is about 3 mm.
  • the annular body 10 has a parallelogram-shaped cross-section on which two sides of the parallelogram at the outer diameter d a and at
  • Inner diameter d extend substantially in the axial direction of the annular body and wherein the two other sides of the parallelogram, which define a first sealing surface 1 1 and a second sealing surface 12, respectively by about 1, 5 ° with respect to a senkecht to the axis of rotation of the annular body 10 extending Plane are inclined.
  • the first sealing surface 1 1 protrudes in an inner edge region 13 in the axial direction furthest, while the second sealing surface 12 is in an outer Edge region 14 in the opposite axial direction protrudes furthest.
  • the edge regions of the first and the second sealing surface 1 1, 12 are rounded with radii of curvature k ⁇ , k 1a , k 2 i, k 2a of, for example, about 0.2 mm.
  • the rounded edge regions for example, sensitive counter surfaces such as a
  • the sealing surfaces have at least in sections an annular circumferential comb structure with a roughness having the peak-peak values of about 10 ⁇ .
  • At least the sealing surfaces are further coated with a non-metallic sealing material, in particular PTFE or PTFA, in particular with a PTFE layer in a thickness of about 40 ⁇ .
  • a non-metallic sealing material in particular PTFE or PTFA
  • the coating with PTFE for example, by applying a suspension followed by sintering at temperatures up to 300 ° C.
  • the comb structure is used in particular for better fixation of the coating. Due to the small extent of the comb structure and the coating are not shown in the drawings.
  • the sealing ring is intended to be axially clamped between a measuring body 21 of a hydraulic measuring unit 20 and a process connection body 30, as shown in Fig. 2.
  • the sealing ring 10 can be clamped so much that the sealing surfaces 1 1, 12 - unlike in Fig. 2 shown - are substantially full-surface and in particular in plane-parallel planes, for example, by a measuring-side, annular
  • Trennmembrandicht Structure 24 a metallic separation membrane 22 or a process connection body side, annular process terminal body sealing surface 32 of a process connection body 30 are defined.
  • the separation membrane 22 covers a pressure chamber of a hydraulic path 25, via which the pressure acting on the separation membrane pressure is to be transmitted to a (not shown here) pressure transducer.
  • the remaining elasticity in the annular body is sufficient to compensate for a decreasing axial clamping between the process connecting body 30 and the measuring mechanism body 21 up to a value of 0.3 dz, where dz is the measure of the axial clamping.
  • the sealing ring 1 faces with its second sealing surface 13 of the separating membrane sealing surface 24. In this case, that occurs
  • the differential pressure measuring transducer shown in FIG. 3 comprises a hydraulic measuring mechanism 20 which forms between two process flanges
  • Process connection bodies 30 is axially clamped, wherein in each case between a Prozeßan gleichkorper 30 and an end face of the hydraulic measuring unit 20, a sealing ring 10 is axially clamped. Details of the clamping are in
  • a separation membrane 22 is arranged in each case which closes a hydraulic path 25 which is intended to transmit the pressure acting on the respective separation membrane 25 to a differential pressure measuring cell 40 in the interior of the hydraulic measuring unit 20.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne une bague d'étanchéité (1) à effet axial comprenant un corps de bague (10) métallique qui comporte une première surface d'étanchéité et une deuxième surface d'étanchéité (11, 12) sur chacune des deux faces frontales du corps de bague (10). Lorsque la bague d'étanchéité est détendue, la première surface d'étanchéité (11) est le plus en saillie dans la direction axiale dans une partie périphérique intérieure (13) du corps de bague et la deuxième surface d'étanchéité (12) est le plus en saillie dans la direction axiale dans une partie périphérique extérieure (14), les deux surfaces d'étanchéité présentant un matériau d'étanchéité non métallique. Après une compression axiale dz sous l'effet d'un serrage axial, dz étant au moins égal à 2 % de l'épaisseur radiale du corps de bague (10), en particulier au moins égal à 3 % de l'épaisseur radiale du corps de bague, et de préférence au moins égal à 4 % de l'épaisseur radiale du corps de bague, la bague d'étanchéité (1) présente une relaxation d'au moins 0,3 dz une fois le serrage axial supprimé.
PCT/EP2013/057062 2012-04-26 2013-04-04 Bague d'étanchéité et capteur de pression muni de ladite bague d'étanchéité WO2013160077A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012103688.8 2012-04-26
DE102012103688.8A DE102012103688B4 (de) 2012-04-26 2012-04-26 Differenzdruckmessaufnehmer

Publications (1)

Publication Number Publication Date
WO2013160077A1 true WO2013160077A1 (fr) 2013-10-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/057062 WO2013160077A1 (fr) 2012-04-26 2013-04-04 Bague d'étanchéité et capteur de pression muni de ladite bague d'étanchéité

Country Status (2)

Country Link
DE (1) DE102012103688B4 (fr)
WO (1) WO2013160077A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10067023B2 (en) 2014-02-28 2018-09-04 Endress+Hauser Se+Co.Kg Differential pressure measuring pickup

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2800147A1 (fr) * 1999-10-22 2001-04-27 Snecma Joint metallique statique et procede de fabrication
GB2382851A (en) * 2001-12-07 2003-06-11 Perkinelmer Inc Annular metallic seal
DE102004052950A1 (de) * 2004-10-29 2006-05-04 Endress + Hauser Gmbh + Co. Kg Druckaufnehmer mit hydraulischer Druckübertragung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7810816B1 (en) * 2005-12-13 2010-10-12 Horace P. Halling Seal
DE202006016225U1 (de) * 2006-10-19 2007-02-01 Endress + Hauser Gmbh + Co. Kg Druckmessaufnehmer
DE102006057828A1 (de) * 2006-12-06 2008-06-12 Endress + Hauser Gmbh + Co. Kg Differenzdruckmeßaufnehmer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2800147A1 (fr) * 1999-10-22 2001-04-27 Snecma Joint metallique statique et procede de fabrication
GB2382851A (en) * 2001-12-07 2003-06-11 Perkinelmer Inc Annular metallic seal
DE102004052950A1 (de) * 2004-10-29 2006-05-04 Endress + Hauser Gmbh + Co. Kg Druckaufnehmer mit hydraulischer Druckübertragung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10067023B2 (en) 2014-02-28 2018-09-04 Endress+Hauser Se+Co.Kg Differential pressure measuring pickup

Also Published As

Publication number Publication date
DE102012103688A1 (de) 2013-10-31
DE102012103688B4 (de) 2020-10-01

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