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WO2011113166A2 - Capteur présentant un dispositif de serrage évitant la déformation - Google Patents

Capteur présentant un dispositif de serrage évitant la déformation Download PDF

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Publication number
WO2011113166A2
WO2011113166A2 PCT/CH2011/000048 CH2011000048W WO2011113166A2 WO 2011113166 A2 WO2011113166 A2 WO 2011113166A2 CH 2011000048 W CH2011000048 W CH 2011000048W WO 2011113166 A2 WO2011113166 A2 WO 2011113166A2
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
clamping device
housing
sensor according
web
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CH2011/000048
Other languages
German (de)
English (en)
Other versions
WO2011113166A3 (fr
Inventor
Josef Glaser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kistler Holding AG
Original Assignee
Kistler Holding AG
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 Kistler Holding AG filed Critical Kistler Holding AG
Publication of WO2011113166A2 publication Critical patent/WO2011113166A2/fr
Publication of WO2011113166A3 publication Critical patent/WO2011113166A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G01L19/14—Housings

Definitions

  • the invention relates to a sensor with an axial alignment comprising a housing with a measuring element in a recess and a radially outside the housing arranged clamping device with two opposite, transverse to the axial direction surfaces and a clamping sleeve for mounting the clamping device to a component, wherein the Clamping device is supported in the mounted state on its first surface on a shoulder of the component and on its second. Surface of the clamping sleeve, which is bolted to the component, is clamped.
  • the sensors described here are used, for example, on structures which are subjected to strong deformations during the measurement. Examples are pressure sensors in cylinder heads of internal combustion engines. Deformations that act a- xial and / or radial of the structure on a housing of such a sensor, also deform the frontally arranged membrane of such a sensor and thereby distort the measurement.
  • the senor is firmly clamped by the assembly between the sealing shoulder and a rear, chamfered clamping.
  • Tensions which act on the front Einspannschul ⁇ ter and / or on the adjoining the rear shoulder to ⁇ ordered thread from the component to the clamping area, are connected by this directly to the sensor housing, since this is rigidly connected to the clamping area.
  • Object of the present invention is to provide a sensor with a clamping device mentioned above, which is used in hot areas, insensitive to axial and radial deformations of the component and is not disturbed by pipe vibrations.
  • the object is achieved according to the invention by the clamping device between the two surfaces of tubular design and is arranged radially spaced from the component through an annular gap.
  • Your only connection to the housing forms a narrow web, which is mounted in the central region of the jig.
  • the Einspannvorrich ⁇ tung thus transmits either an axial or a radial stress from the component to the housing and verhin ⁇ changed by an incorrect measurement of the measuring element in use.
  • the tubular clamping device with its centrally located web to the sensor housing on each side resembles a "T", which apart from the three free ends of the two lines are arranged without contact to other components the pipe ends, are the clamping components clamping sleeve and component, above the annular gap to the component out.
  • the sensor housing is finally attached to the "T", the bridge. kung in the radial direction, since it is very thin relative to its axial length, so that hardly transfer forces from the pipe ends on the web.
  • FIG. 1 shows a sensor with a housing and a measuring element in a recess provided for this purpose
  • Fig. 2 is a sensor of Figure 1 in the installed state of the prior art.
  • Fig. 3 is a front-sealing sensor in the installed state of the prior art
  • Fig. 6 is an improved front-sealing sensor in the installed state of the prior art
  • FIG. 7 shows a front-sealing sensor according to the invention in the installed state
  • 8 shows a shoulder-sealing sensor according to the invention in the installed state
  • FIG. 9 shows a shoulder-sealing sensor according to the invention in the installed state with heat shield; Fig. 10a-f variants of the clamping devices.
  • Fig. 1 shows a conventional sensor 1 with a housing 2 with a measuring element 3 in a Ausspa ⁇ tion provided therein 11.
  • the housing 2 is constructed axially and front side with a membrane 14, behind which in this embodiment, a plunger 15 is mounted. This can transmit a frontal pressure acting on the diaphragm 14 pressure on the Messele- ment 3.
  • piezoelectric, piezoresistive or optical measuring elements 3 are used.
  • the structure of FIG. 1 is only one possible, typical structure of a sensor 1.
  • An ⁇ constructions are also common and also form the basis of the structures shown further.
  • FIGS. 2 to 6 form sensors 1 with clamping devices according to the prior art.
  • a sensor 1 is shown in FIG. 1, which is turned ⁇ simply screwed in a component 9. Accessed from the mounting thread 16 both axial and radial deformations of the housing 2 for Messele ⁇ element 3.
  • Fig. 3 shows an end-sealing sensor 1, which is not screwed directly as the sensor 1 in Fig. 2, but at a front paragraph 10 supported on the component 9. Is held the housing 2 at the back by means of a clamping sleeve 8, which is attached to a mounting thread 16 on the component 9.
  • FIG. 4 shows a further end-sealing sensor 1.
  • the housing 2 is configured on the front side in a tube, which is arranged radially ⁇ spaced from the component 9.
  • radial deformations hardly reach the measuring element 3 via the shoulder 10.
  • axial deformations between the shoulder 10 and the mounting thread 16 compress the housing 1 in the area around the measuring element 3.
  • the axial and radial deformations on the mounting thread 16 also have a short path on the measuring element 3.
  • FIG. 5 A similar arrangement as in FIG. 3 is shown in FIG. 5, but as a shoulder-sealing sensor.
  • the front region of the housing 2 is arranged without contact with the component 9. Since the housing part 2 is completely free in the area of the measuring element 3, the measuring element 3 is not affected by disturbing deformations.
  • the disadvantage of such an arrangement is that in hot processes, the large, exposed to the heating surface of the face of the housing 2 and the membrane 14 to the overheating ⁇ wetting and may eventually lead to the destruction of the sensor. 1 6, this problem has been solved in that the sensor 1 has again been carried out in a front-end sealing manner, wherein the measuring element 3 is arranged in the housing 2 set far back.
  • the entire housing element 2 comprising the measuring element 3 is completely free and thus not affected by deformations.
  • Mandatory here is the exempted large axial distance between the rear end of the mounting thread 16 and the membrane 14.
  • pipe vibrations which in turn have a disturbing effect on the measurement.
  • heat, which flows into the sensor 1, can be dissipated poorly.
  • FIG. 7 shows a front-end sealing sensor 1 according to the invention.
  • a housing 2 with a measuring element 3 in a recess 11 provided therein.
  • the housing 2 has an axial construction and is closed at the front by a diaphragm 14, behind which a pressure stamp 15 is mounted in this embodiment.
  • This may include a frontal acting on the diaphragm 14 pressure on the measuring element 3 übertra ⁇ gene, as shown in FIG. 1 by arrows.
  • Other constructions are also possible.
  • a clamping device 4> Radially outside the housing 2 is a clamping device 4>. arranged with two opposite, transverse to the axial direction surfaces 5, 6.
  • a clamping sleeve 8 is provided, which clamps the clamping device 4 to a component 9 in the mounted state.
  • the clamping device 4 is supported on its first surface 5 on a shoulder 10 of the component 9 and is pressed against its second surface.
  • che 6 of the clamping sleeve 8 which is bolted to the component 9, clamped.
  • the surface 6 corresponds in this arrangement no cutting surface, since this part of the jig 4 is connected to the clamping sleeve 8.
  • the theoretical 1 surface 6 defines the end of the clamping device '. 4
  • the clamping device 4 is tubular between the two surfaces 5, 6 and comprises two parts 4a, 4b, each of which must be axially much longer than its wall thickness. As a result, a radial force, which is introduced from the component 9 via one of the surfaces 5, 6 into the parts 4a, 4b of the clamping device, is not transmitted radially.
  • the clamping device 4 is located towards a radial distance to the part 9, and with the common housing 2 only at its central portion by a schma ⁇ len web 7 is connected, so that the chuck 4 in use either an axial or a radial stress from the component 9 transmits to the housing 2. As a result, an incorrect measurement of the measuring element 3 is prevented.
  • Deformation can thus reach the housing 2 via the component 9 only at the end regions via the surfaces 5, 6 via the two parts of the clamping device 4a, 4b and via the web 7.
  • the two parts of the clamping device 4a, 4b on both sides of the web 7 act as a spring, because they are designed long, in contrast to their radial wall thickness WE.
  • the axial length LE of the clamping device 4 should in the optimal case at least five times, preferably at least ten times as large as the wall thickness WE in the tubular region.
  • the wall thickness WE of the clamping device 4 in the tubular region 4a, 4b should preferably be at least three times, preferably at least five times, smaller than the wall thickness WG of the housing 2 in the region of the measuring element 3. This ensures that the clamping device 4 is much softer than the housing , whereby less radial forces are transferred.
  • the web 7 is axially comparatively short (LS) with respect to the axial length LA of the recess 11 in the housing 2 for the measuring element 3 and with respect to each of the tubular parts 4a, 4b of the clamping devices.
  • the aspect ratio should be at least 1: 2, preferably at least 1: 4. This prevents axial distortions from the component 9 from being transmitted to the measuring element 3.
  • the web 7 is integrally connected to the housing 2. But this is' not mandatory, because the bridge 1 can also be designed as a ring attached or attached.
  • the web 7 with one or both of the adjoining parts of the clamping device 4a, 4b may be integrally connected to one or both of the support surfaces 5, 6.
  • the web 7 with the part 4a of the jig and the support surface 5 is integrally connected.
  • the clamping sleeve 8 with the adjacent tubular part 4b of the clamping device integrally connected to its clamping surface 6.
  • the web 7 is attached to the front end of the housing 2.
  • the sensor 1 is a front-sealing sensor and the support surface 5 is the front-most front of the sensor 1.
  • FIG. 8 shows another embodiment of a sensor 1 according to the invention.
  • this embodiment is shoulder-sealing. Its front region of the sensor housing 2 is surrounded by a gap axially outward, and the web 7 is set back from the front end of the housing 2.
  • this embodiment differs in Fig. 8 from that in Fig. 7, that the part 4a of the jig is a ring which is not connected to the web 7.
  • the part 4b of the clamping device could be designed with a clamping surface 6 as a ring and not be integrally connected to the clamping sleeve 8.
  • FIG. 9 shows a further arrangement of a shoulder-sealing sensor 1 according to the invention.
  • the ring is designed as part 4a of the jig axially longer and protrudes frontally over the region of the housing 2.
  • a heat shield 13 is also attached to reduce the heat input to the sensor.
  • the arrangements according to the invention in FIGS. 7-9 are all distinguished by a deformation-decoupled clamping with a clamping device 4, which can transmit neither radial nor axial deformations or stresses.
  • such sensors 1 according to the invention can be designed as pressure, force or acceleration sensors, preferably with piezoelectric measuring elements 3.
  • these sensors 1 are heat-resistant for measuring processes in combustion chambers of internal combustion engines, in particular in cylinder heads.
  • clamping device 4 is provided with means 19, 20, 21, which increases their radial mobility. It therefore becomes radially softer and thus transmits less stress to the sensor. Examples are set forth in FIG. Fig. 10a shows the clamping device 4, without web 7, which would be mounted approximately centrally, in its original form.
  • FIGS. 10 b and c show two radially movable variants, where ⁇ the mobility is provided by internal annular gaps 19.
  • the radial mobility is achieved by means of two regions 20 designed to be tapered.
  • the large bearing surfaces 5, 6 remain in these variants of FIG. 10 bd obtained.
  • the abutment surface 5 and the clamping surface 6 are reduced by bends or rounded portions 21 of the bearing surfaces, as far as rolling versions with rounded surfaces 5, 6. These versions are particularly suitable for hard mounting locations.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Clamps And Clips (AREA)

Abstract

L'invention concerne un capteur ayant une orientation axiale, ce capteur comprenant un boîtier (2) ayant un élément de mesure (3) dans un logement (11) et un dispositif de serrage (4) disposé radialement en dehors du boîtier (2) et comprenant deux surfaces (5, 6) orientées transversalement à la direction axiale et opposées l'une à l'autre ainsi qu'une douille de serrage (8) destinée à monter le dispositif de serrage (4) sur un composant (9). Dans l'état de montage, le dispositif de serrage (4) s'appuie par sa première surface (5) sur un décrochement (10) du composant (9) et il est serré sur sa deuxième surface (6) par la douille de serrage (8) qui est vissée sur le composant (9). Selon l'invention, le dispositif de serrage (4) a une forme tubulaire entre les deux surfaces (5, 6) et il est écarté du composant (9) dans la direction radiale. De plus, il n'est relié au boîtier (2) que dans sa partie centrale par une étroite nervure (7), si bien que le dispositif de serrage (4), en service, ne transmet aucune contrainte entre le composant (9) et le boîtier (2), que ce soit axialement ou radialement. On évite ainsi des erreurs de mesure de l'élément de mesure (3).
PCT/CH2011/000048 2010-03-18 2011-03-10 Capteur présentant un dispositif de serrage évitant la déformation Ceased WO2011113166A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH389/10 2010-03-18
CH00389/10A CH702915A1 (de) 2010-03-18 2010-03-18 Sensor mit verformungs-entkoppelter einspannungsvorrichtung.

Publications (2)

Publication Number Publication Date
WO2011113166A2 true WO2011113166A2 (fr) 2011-09-22
WO2011113166A3 WO2011113166A3 (fr) 2011-12-22

Family

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PCT/CH2011/000048 Ceased WO2011113166A2 (fr) 2010-03-18 2011-03-10 Capteur présentant un dispositif de serrage évitant la déformation

Country Status (2)

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CH (1) CH702915A1 (fr)
WO (1) WO2011113166A2 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395622A2 (fr) 1989-03-30 1990-10-31 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Capteur de pression
DE4234290A1 (de) 1992-10-12 1994-04-14 Fibronix Sensoren Gmbh Drucksensor
EP1531323A2 (fr) 2003-11-14 2005-05-18 VEGA Grieshaber KG Fixation d'un capteur de pression

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10064811A1 (de) * 2000-12-22 2002-06-27 Endress & Hauser Gmbh & Co Kg Druckmessvorrichtung
DE10243079A1 (de) * 2002-09-16 2004-03-25 Endress + Hauser Gmbh + Co. Kg Kapazitiver Drucksensor
JP2010509574A (ja) * 2006-11-10 2010-03-25 キストラー ホールディング アクチエンゲゼルシャフト 高温かつ動的なプロセスにおける測定で用いる圧力センサー

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395622A2 (fr) 1989-03-30 1990-10-31 AVL Gesellschaft für Verbrennungskraftmaschinen und Messtechnik mbH.Prof.Dr.Dr.h.c. Hans List Capteur de pression
DE4234290A1 (de) 1992-10-12 1994-04-14 Fibronix Sensoren Gmbh Drucksensor
EP1531323A2 (fr) 2003-11-14 2005-05-18 VEGA Grieshaber KG Fixation d'un capteur de pression

Also Published As

Publication number Publication date
CH702915A1 (de) 2011-09-30
WO2011113166A3 (fr) 2011-12-22

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