WO2008055619A1 - Sensor for hostile environment - Google Patents

Sensor for hostile environment Download PDF

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Publication number
WO2008055619A1
WO2008055619A1 PCT/EP2007/009489 EP2007009489W WO2008055619A1 WO 2008055619 A1 WO2008055619 A1 WO 2008055619A1 EP 2007009489 W EP2007009489 W EP 2007009489W WO 2008055619 A1 WO2008055619 A1 WO 2008055619A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
sensor
truncated cone
seal
hostile environment
Prior art date
Application number
PCT/EP2007/009489
Other languages
French (fr)
Inventor
Vincent Wittemberg
Sébastien Donatien
Daniel Ramond
Original Assignee
Sc2N
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 Sc2N filed Critical Sc2N
Publication of WO2008055619A1 publication Critical patent/WO2008055619A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/08—Protective devices, e.g. casings

Definitions

  • the present invention relates to a sensor for hostile environments, in particular a high temperature sensor for a motor vehicle for measuring the temperature of the exhaust gas.
  • Such sensors are known for example from documents FR 2 847 979,
  • These sensors comprise enclosed in a generally tubular metal housing an electrical component such as a thermistor, to measure a parameter such as temperature.
  • This electrical component is connected via electrical wires which are led outwards, to an electrical / electronic circuit for operating a measurement signal.
  • FIG. 1 shows an example of the state of the art.
  • a sensor for hostile environments such as a temperature sensor for the exhaust gas.
  • This sensor comprises at one end 3 an electrical measuring component such as for example a thermistor 5 (for example a ceramic component whose resistivity varies with temperature).
  • This component is housed in a closed protective case 7, for example refractory steel, vis-à-vis the outside (gas, water, moisture, etc.).
  • Two first electrical conductors 9 are in contact with the thermistor and run along the protective housing 7 to be accessible outside thereof and provide electrical information representative of the resistance of the element 5 and therefore the measured temperature. These conductors 9 are insulated and held together by an insulating sheath housed in the housing 7.
  • first electrical wires 9 are connected by means of an electrical connection piece 13, for example in the form of a lug, to second electric wires 15 of larger diameter serving to provide the electrical connection. with electrical circuits.
  • the housing 7 comprises a portion 21 of reduced diameter.
  • This portion 21 is for example made by rolling two semi-cylindrical profiles.
  • Figure 2 shows another example of the state of the art.
  • the reduced-diameter portion 21 has a cylindrical shape with a constant diameter.
  • the present invention aims to remedy this problem by providing a sensor for hostile environments whose risk of tearing is decreased.
  • the subject of the invention is a sensor for hostile environments comprising a casing of cylindrical general shape and a cylindrical elastomer seal which comprises at least one passage of an electric wire and which is inserted in the housing, characterized in that the housing comprises at the seal a rolled portion having a general shape of a truncated cone.
  • the sensor according to the invention may further comprise one or more of the following characteristics: the base of the laminated portion in the form of a truncated cone is situated on the side of the outlet end of the wires, the top of the rolled portion in the form of of a cone frustum has a reduced diameter to block the electrical connection piece, the elastomer piece has a chamfer insertion into the housing.
  • FIG. 1 shows a longitudinal sectional view of a sensor known from the state of the art
  • FIG. 2 shows a longitudinal sectional view of a detail of another known sensor of the state of the art
  • FIG. 3 shows a longitudinal sectional view of a detail of a sensor according to the invention.
  • Figure 3 is a detail in a cross sectional view of a sensor for hostile environments according to the invention.
  • the sensor according to the invention differs from those known from the state of the art in that the rolled portion 21 has a general shape of a truncated cone.
  • the base 25 of the laminated portion in the form of a truncated cone is located on the side of the outlet end of the son 15, which may facilitate assembly.
  • the top 27 of the laminated portion in the form of a truncated cone has a reduced diameter to block the electrical connection piece 13.
  • the elastomer part 17 has a chamfer 29 insertion into the housing 7 to also facilitate the mounting of the sensor.
  • the present invention has just been described with respect to a temperature sensor, in particular for exhaust gases for motor vehicles.
  • the invention is not limited to this embodiment and can be applied without difficulty to any sensor in a hostile environment comprising in a generally cylindrical housing an electrical component which must be protected against the environment.

Abstract

The present invention relates to a sensor for a hostile environment, that comprises a generally cylindrical housing (7) and an elastomer cylindrical seal (17) including at least one passage (19) for an electric wire (15) and inserted into the housing (7). The housing (7) further comprises, at the seal (17), a layered portion (21) having an essentially frustoconical shape.

Description

Capteur pour milieux hostiles Sensor for hostile environments
La présente invention concerne un capteur pour milieux hostiles, en particulier un capteur haute température pour véhicule automobile permettant de mesurer la température des gaz d'échappement.The present invention relates to a sensor for hostile environments, in particular a high temperature sensor for a motor vehicle for measuring the temperature of the exhaust gas.
On connaît de tels capteurs par exemple des documents FR 2 847 979,Such sensors are known for example from documents FR 2 847 979,
FR 2 880 685 ou FR 2 979 687.FR 2 880 685 or FR 2 979 687.
Ces capteurs comprennent enfermés dans un boîtier de forme générale tubulaire et métallique un composant électrique tel qu'une thermistance, pour mesurer un paramètre comme la température. Ce composant électrique est relié via des fils électriques qui sont amenés vers l'extérieur, à un circuit électrique / électronique d'exploitation d'un signal de mesure.These sensors comprise enclosed in a generally tubular metal housing an electrical component such as a thermistor, to measure a parameter such as temperature. This electrical component is connected via electrical wires which are led outwards, to an electrical / electronic circuit for operating a measurement signal.
Comme ces capteurs sont utilisés dans la ligne d'échappement ou dans le compartiment moteur, ils sont exposés à un environnement très hostile du fait des projections d'huile ou de l'eau.As these sensors are used in the exhaust line or in the engine compartment, they are exposed to a very hostile environment due to splashing oil or water.
Pour assurer un bon fonctionnement, il est donc important d'assurer une bonne étanchéité du boîtier vis-à-vis de l'extérieur, en particulier au niveau des fils de connexion assurant la connectique du capteur.To ensure proper operation, it is therefore important to ensure a good seal of the housing vis-à-vis the outside, especially at the son of connection ensuring the connection of the sensor.
On a représenté sur la figure 1 un exemple de l'état de la technique. Sur cette figure, on voit un capteur pour milieux hostiles 1 , comme par exemple un capteur de température pour les gaz d'échappement. Ce capteur comprend à une extrémité 3 un composant électrique de mesure comme par exemple une thermistance 5 (par exemple un composant céramique dont la résistivité varie avec la température). Ce composant est logé dans un boîtier de protection fermé 7, par exemple en acier réfractaire, vis-à-vis de l'extérieur (gaz, eau, humidité, etc.). Deux premiers conducteurs électriques 9 sont en contact avec la thermistance et cheminent le long du boîtier de protection 7 pour être accessibles à l'extérieur de celui-ci et fournir une information électrique représentative de la résistance de l'élément 5 et par conséquent de la température mesurée. Ces conducteurs 9 sont isolés et maintenus entre eux par une gaine isolante logée dans le boîtier 7.FIG. 1 shows an example of the state of the art. In this figure, we see a sensor for hostile environments 1, such as a temperature sensor for the exhaust gas. This sensor comprises at one end 3 an electrical measuring component such as for example a thermistor 5 (for example a ceramic component whose resistivity varies with temperature). This component is housed in a closed protective case 7, for example refractory steel, vis-à-vis the outside (gas, water, moisture, etc.). Two first electrical conductors 9 are in contact with the thermistor and run along the protective housing 7 to be accessible outside thereof and provide electrical information representative of the resistance of the element 5 and therefore the measured temperature. These conductors 9 are insulated and held together by an insulating sheath housed in the housing 7.
Pour une meilleure connectivité, les premier fils électriques 9 sont reliés par l'intermédiaire d'une pièce de liaison électrique 13, par exemple sous forme d'une cosse, à des seconds fils électriques 15 de diamètre plus important servant à assurer la liaison électrique avec les circuits électriques.For better connectivity, the first electrical wires 9 are connected by means of an electrical connection piece 13, for example in the form of a lug, to second electric wires 15 of larger diameter serving to provide the electrical connection. with electrical circuits.
L'étanchéité est assurée grâce à une pièce en élastomère 17 de forme générale cylindrique et présentant deux passages parallèles 19 pour les seconds fils électriques 15.Sealing is ensured by means of an elastomer part 17 of generally cylindrical shape and having two parallel passages 19 for the second electric wires 15.
Pour bloquer la pièce en élastomère en position et assurer les fils 15 contre des arrachements intempestifs, le boîtier 7 comprend une portion 21 à diamètre réduit.To lock the elastomeric piece in position and ensure the son 15 against inadvertent tearing, the housing 7 comprises a portion 21 of reduced diameter.
Cette portion 21 est par exemple réalisée par laminage de deux profils semi cylindriques.This portion 21 is for example made by rolling two semi-cylindrical profiles.
La figure 2 montre un autre exemple de l'état de la technique. Sur cette figure qui présente une vue agrandie en coupe transversale, la portion 21 à diamètre réduit possède une forme cylindrique à diamètre constant.Figure 2 shows another example of the state of the art. In this figure which has an enlarged cross-sectional view, the reduced-diameter portion 21 has a cylindrical shape with a constant diameter.
Toutefois, la Demanderesse a constaté que ce laminage cylindrique ou avec des profils semi-cylindriques augmente de façon importante les contraintes sur le joint en élastomère, ce qui augmente le risque de formation des déchirures 23, en particulier lors de variations importantes des contraintes comme au niveau des extrémités de la portion laminée 21.However, the Applicant has found that this cylindrical lamination or with semi-cylindrical profiles significantly increases the stresses on the elastomer seal, which increases the risk of tear formation 23, in particular during significant variations in stresses as in level of the ends of the rolled portion 21.
La présente invention vise à remédier à ce problème en proposant un capteur pour milieux hostiles dont le risque de déchirure est diminué. A cet effet, l'invention a pour objet un capteur pour milieux hostiles comprenant un boîtier de forme générale cylindrique et un joint cylindrique en élastomère qui comporte au moins un passage d'un fil électrique et qui est inséré dans le boîtier, caractérisé en ce que le boîtier comporte au niveau du joint d'étanchéité une portion laminée ayant une forme générale d'un tronc de cône.The present invention aims to remedy this problem by providing a sensor for hostile environments whose risk of tearing is decreased. For this purpose, the subject of the invention is a sensor for hostile environments comprising a casing of cylindrical general shape and a cylindrical elastomer seal which comprises at least one passage of an electric wire and which is inserted in the housing, characterized in that the housing comprises at the seal a rolled portion having a general shape of a truncated cone.
Le capteur selon l'invention peut comporter en outre une ou plusieurs des caractéristiques suivantes : la base de la portion laminée en forme de tronc de cône est située du côté de l'extrémité de sortie des fils, le sommet de la portion laminée en forme de tronc de cône possède un diamètre réduit pour bloquer la pièce de liaison électrique, la pièce en élastomère comporte un chanfrein d'insertion dans le boîtier.The sensor according to the invention may further comprise one or more of the following characteristics: the base of the laminated portion in the form of a truncated cone is situated on the side of the outlet end of the wires, the top of the rolled portion in the form of of a cone frustum has a reduced diameter to block the electrical connection piece, the elastomer piece has a chamfer insertion into the housing.
D'autres avantages et caractéristiques apparaîtront à la lecture de la description de l'invention, ainsi que des figures suivantes sur lesquelles : - la figure 1 présente une vue en coupe longitudinale d'un capteur connu de l'état de la technique,Other advantages and characteristics will appear on reading the description of the invention, as well as the following figures in which: FIG. 1 shows a longitudinal sectional view of a sensor known from the state of the art,
- la figure 2 présente une vue en coupe longitudinale d'un détail d'un autre capteur connu de l'état de la technique,FIG. 2 shows a longitudinal sectional view of a detail of another known sensor of the state of the art,
- la figure 3 présente une vue en coupe longitudinale d'un détail d'un capteur selon l'invention.- Figure 3 shows a longitudinal sectional view of a detail of a sensor according to the invention.
Sur toutes les figures, les éléments identiques portent les mêmes numéros de référence.In all the figures, the identical elements bear the same reference numbers.
La figure 3 est un détail selon une vue en coupe transversale d'un capteur pour milieux hostiles selon l'invention. Le capteur selon l'invention se distingue de ceux connus de l'état de la technique par le fait que la portion laminée 21 possède une forme générale d'un tronc de cône.Figure 3 is a detail in a cross sectional view of a sensor for hostile environments according to the invention. The sensor according to the invention differs from those known from the state of the art in that the rolled portion 21 has a general shape of a truncated cone.
Cette forme présente l'avantage de diminuer les contraintes abruptes tout en assurant une bonne tenue et en permettant de réaliser une bonne étanchéité. Avantageusement, la base 25 de la portion laminée en forme de tronc de cône est située du côté de l'extrémité de sortie des fils 15, ce qui peut faciliter le montage.This form has the advantage of reducing the abrupt constraints while ensuring a good performance and allowing to achieve a good seal. Advantageously, the base 25 of the laminated portion in the form of a truncated cone is located on the side of the outlet end of the son 15, which may facilitate assembly.
De préférence, le sommet 27 de la portion laminée en forme de tronc de cône possède un diamètre réduit pour bloquer la pièce de liaison électrique 13.Preferably, the top 27 of the laminated portion in the form of a truncated cone has a reduced diameter to block the electrical connection piece 13.
Enfin, la pièce en élastomère 17 comporte un chanfrein 29 d'insertion dans le boîtier 7 pour également faciliter le montage du capteur.Finally, the elastomer part 17 has a chamfer 29 insertion into the housing 7 to also facilitate the mounting of the sensor.
La présente invention vient d'être décrite par rapport à un capteur de température, en particulier pour des gaz d'échappement pour véhicules automobiles. Toutefois, l'invention n'est nullement limitée à cet exemple de réalisation et peut être appliquée sans difficulté à tout capteur en milieu hostile comportant dans un boîtier de forme générale cylindrique un composant électrique qui doit être protégé contre l'environnement. The present invention has just been described with respect to a temperature sensor, in particular for exhaust gases for motor vehicles. However, the invention is not limited to this embodiment and can be applied without difficulty to any sensor in a hostile environment comprising in a generally cylindrical housing an electrical component which must be protected against the environment.

Claims

REVENDICATIONS
1. Capteur pour milieux hostiles comprenant un boîtier (7) de forme générale cylindrique et un joint cylindrique (17) en élastomère qui comporte au moins un passage (19) d'un fil électrique (15) et qui est inséré dans le boîtier (7), caractérisé en ce que le boîtier (7) comporte au niveau du joint d'étanchéité (17) une portion laminée (21) ayant une forme générale d'un tronc de cône. A hostile environment sensor comprising a generally cylindrical housing (7) and a cylindrical elastomeric seal (17) which has at least one passage (19) of an electrical wire (15) and which is inserted into the housing ( 7), characterized in that the housing (7) comprises at the seal (17) a rolled portion (21) having a general shape of a truncated cone.
2. Capteur selon la revendication 1 , caractérisé en ce que la base (25) de la portion laminée (21) en forme de tronc de cône est située du côté de l'extrémité de sortie des fils (15).2. Sensor according to claim 1, characterized in that the base (25) of the laminated portion (21) in the form of a truncated cone is located on the side of the output end of the son (15).
3. Capteur selon la revendication 1 ou 2, caractérisé en ce que le sommet (27) de la portion laminée en forme de tronc de cône possède un diamètre réduit pour bloquer la pièce de liaison électrique (13).3. Sensor according to claim 1 or 2, characterized in that the vertex (27) of the laminated portion in the form of a truncated cone has a reduced diameter to block the electrical connection piece (13).
4. Capteur selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la pièce en élastomère (17) comporte un chanfrein d'insertion (29) dans le boîtier (7). 4. Sensor according to any one of claims 1 to 3, characterized in that the elastomeric piece (17) has an insertion chamfer (29) in the housing (7).
PCT/EP2007/009489 2006-11-07 2007-10-31 Sensor for hostile environment WO2008055619A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0609737A FR2893126B1 (en) 2006-11-07 2006-11-07 SENSOR FOR HOSTILE ENVIRONMENTS
FR0609737 2006-11-07

Publications (1)

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WO2008055619A1 true WO2008055619A1 (en) 2008-05-15

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WO (1) WO2008055619A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2093548B1 (en) 2008-02-20 2017-03-22 UST Umweltsensortechnik GmbH High temperature sensor and method for its manufacture
FR2958039B1 (en) * 2010-03-26 2013-01-18 Sc2N Sa TEMPERATURE SENSOR
FR2988172B1 (en) * 2012-03-19 2014-12-26 Sc2N Sa TEMPERATURE SENSOR

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6286995B1 (en) * 1998-09-22 2001-09-11 Denso Corporation Temperature sensor
US20020061049A1 (en) * 2000-11-22 2002-05-23 Tomohiro Adachi Temperature sensor
US20040101028A1 (en) * 2002-11-22 2004-05-27 Ngk Spark Plug Co., Ltd. Temperature sensor
US7060949B1 (en) * 2003-05-16 2006-06-13 Watlow Electric Manufacturing Company End seal design for temperature sensing probes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6286995B1 (en) * 1998-09-22 2001-09-11 Denso Corporation Temperature sensor
US20020061049A1 (en) * 2000-11-22 2002-05-23 Tomohiro Adachi Temperature sensor
US20040101028A1 (en) * 2002-11-22 2004-05-27 Ngk Spark Plug Co., Ltd. Temperature sensor
US7060949B1 (en) * 2003-05-16 2006-06-13 Watlow Electric Manufacturing Company End seal design for temperature sensing probes

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Publication number Publication date
FR2893126A1 (en) 2007-05-11
FR2893126B1 (en) 2009-07-10

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