EP0748442A1 - Sonde de mesure electrochimique - Google Patents
Sonde de mesure electrochimiqueInfo
- Publication number
- EP0748442A1 EP0748442A1 EP95941593A EP95941593A EP0748442A1 EP 0748442 A1 EP0748442 A1 EP 0748442A1 EP 95941593 A EP95941593 A EP 95941593A EP 95941593 A EP95941593 A EP 95941593A EP 0748442 A1 EP0748442 A1 EP 0748442A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing ring
- sensor element
- housing
- metallic sleeve
- sensor according
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C29/00—Joining metals with the aid of glass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4078—Means for sealing the sensor element in a housing
Definitions
- the invention relates to an electrochemical sensor according to the preamble of the main claim.
- Measuring sensors are designed, for example, with a sensor element in the so-called finger design.
- the sensor element is. a solid electrolyte body, which is designed as a closed tube and is fixed gas-tight in a metallic housing.
- the finger probes With the finger probes, a distinction is made between the floating and the floating probes.
- the conductor track of the outer electrode is contacted with the housing by means of an electrically conductive sealing ring.
- each electrode connection is tapped separately, so that no electrical contact with the housing is permitted. A seal between the solid electrolyte body and the housing must be implemented in both cases.
- the sensor according to the invention with the characterizing features of the main claim has the advantage that both a gas-tight and gasoline-resistant and an electrically insulating installation of the solid electrolyte body in the metallic housing is possible.
- the insulation effect of the cover layer is not impaired by the use of the sealing arrangement.
- a particularly gas-tight and gasoline-proof installation is achieved by a metallic sleeve which is connected to the solid electrolyte body to form a structural unit, the metallic sleeve being welded to the metallic housing.
- An additional pressure-distributing sealing ring reduces pressure peaks on the sealing arrangement.
- the additional sealing ring also improves the resistance to hot corrosion.
- a slightly higher coefficient of thermal expansion of the metallic sleeve is not harmful, since the resulting compressive stresses can be compensated for by the ceramic sealing ring.
- FIG. 1 shows a cross section through an exhaust-side part of a sensor according to the invention and
- FIG. 2 shows an enlarged section of a sealing zone in FIG. 1.
- the electrochemical sensor 10 shown in a section according to FIG. 1 has a metallic housing 11 with a thread 12 as a fastening means for installation in an exhaust pipe (not shown) and a sensor element 13.
- the housing 11 has a longitudinal bore 15 with a sealing seat 16 on the housing side Sealing seat 16 forms between sensor element 13 and housing 11
- Sealing zone 30, which is shown enlarged in Figure 2.
- the sensor element 13 is tightly connected to the housing 11 by means of a sealing arrangement 31.
- the connection-side end of the housing 11 is surrounded by an encapsulation 20 in which the connection-side components are accommodated.
- the sensor element 13 is a tubular one
- Solid electrolyte body 17 the measuring gas-side end section 22 is closed.
- connection-side end section 23 there is a bulge-shaped head 18 on the solid electrolyte body 17 formed on an annular end face 25.
- a shoulder-shaped sealing seat 19 is formed on the bead-shaped head 18, with which the sensor element 13 bears against the sealing arrangement 31.
- a measuring electrode, not shown, is arranged on the solid electrolyte body 17 on the outside exposed to the measuring gas, and a reference electrode, also not shown, exposed to the reference gas, for example air, is arranged on the side facing the interior.
- the measuring electrode and reference electrode are each guided with conductor tracks, also not shown, to electrode contacts 24 arranged on the end face 25.
- contact parts 26 On the electrode contacts 24 there are contact parts 26 which are each contacted with a connecting cable 27.
- the connecting cables 27 are led out of the encapsulation 20 remote from the measuring gas through a sealing part (not shown) and connected to a measuring or control device.
- an insulating sleeve 28 In the longitudinal bore 15 of the housing 11 there is also an insulating sleeve 28, which preferably consists of a ceramic material. With the help of a mechanical means, not shown, the insulating sleeve 28 is pressed onto the contact parts 26, as a result of which the electrical connection to the electrode contacts 24 is realized.
- the sensor element 13 protruding from the longitudinal bore 15 on the measuring gas side is surrounded at a distance by a protective tube 40 which has openings 41 for the entry and exit of the measuring gas and is held on the measuring gas end of the housing 11.
- the interior of the sensor element 13 is filled, for example, by a rod-shaped heating element 45 which, not shown, is provided with line connections.
- the sealing arrangement 31 comprises a ceramic sealing ring 33, a metallic sleeve 34 and a glass melt 35.
- the metallic sleeve 34 is largely modeled on the contour of the longitudinal bore 15. At the connection end, the sleeve 34 is flanged to form an annular collar 36.
- the collar 36 overlaps an edge 14 formed on the housing 11.
- the metallic sleeve 34 is designed with an annular support 37.
- Forsterite for example, is suitable as the material for the ceramic sealing ring 33.
- Ferritic or martensitic steels are preferably used for the metallic sleeve 34.
- the sintered sensor element 13 is connected to the ceramic sealing ring 33, the metallic sleeve 34 and the glass melt 35 to form a structural unit. This is done by inserting the ceramic sealing ring 33 into the metallic sleeve 34, the sealing ring 33 resting on the support 37. In the ceramic sealing ring 33, the sensor element 13 is inserted so that it with the
- Sealing seat 19 rests on the sealing ring 33.
- a glass powder for example barium silicate glass powder, is introduced into the gaps between sensor element 13 and sealing ring 33 and between sealing ring 33 and metallic sleeve 34. This arrangement becomes a thermal
- a pressure-distributing sealing ring 38 is first positioned on the sealing seat 16.
- the assembly consisting of the sensor element 13 and the sealing arrangement 31 is now placed on the sealing ring 38.
- the collar 36 of the metallic sleeve 34 is placed on the edge 14 of the housing 11.
- the encapsulation 20 is then pushed over the collar 36, the insulating sleeve 28 additionally pressing on the sensor element 13 and thus on the structural unit.
- pressure is exerted on the pressure-distributing sealing ring 38.
- the encapsulation 20 is welded gas-tight together with the collar 36 to the housing 11, for example by laser welding.
- a further embodiment of the sealing arrangement 31 consists in that the ceramic sealing ring 33 is provided with a glass layer at least on its inner and outer lateral surface. By means of a thermal treatment, the glass layer changes into a molten phase, which forms the glass melt 35 between the sensor element 13 and the metallic sleeve 34.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biochemistry (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Electrochemistry (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
La présente invention concerne une sonde de mesure électrochimique, destinée en particulier à la détermination de la teneur en oxygène des gaz d'échappement de moteurs à combustion interne. Cette sonde comprend un élément capteur (13) monté de façon à être sans potentiel et comportant un bloc d'électrolyte solide (17) conducteur des ions d'oxygène, qui a la forme d'un tube fermé à une extrémité. L'élément capteur (13) est monté dans un boîtier métallique (11) au moyen d'un dispositif d'étanchéité (31). Le dispositif d'étanchéité (31) présente une enveloppe métallique (34) à laquelle l'élément capteur (13) est fixé au moyen d'une bague d'étanchéité céramique (33) et d'un scellement en verre (35), de telle sorte que l'élément capteur (17), la bague d'étanchéité céramique (33) et l'enveloppe métallique (34) constituent un sous-ensemble unitaire. Le scellement en verre (35) se trouve entre l'élément capteur (13) et la bague d'étanchéité céramique (33) ainsi qu'entre la bague d'étanchéité céramique (33) et l'enveloppe métallique (38). L'enveloppe métallique (38) est soudée au boîtier (11) de façon étanche aux gaz.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19500147A DE19500147A1 (de) | 1995-01-04 | 1995-01-04 | Elektrochemischer Meßfühler |
DE19500147 | 1995-01-04 | ||
PCT/DE1995/001809 WO1996021148A1 (fr) | 1995-01-04 | 1995-12-18 | Sonde de mesure electrochimique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0748442A1 true EP0748442A1 (fr) | 1996-12-18 |
Family
ID=7751002
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95941593A Withdrawn EP0748442A1 (fr) | 1995-01-04 | 1995-12-18 | Sonde de mesure electrochimique |
Country Status (5)
Country | Link |
---|---|
US (1) | US5755941A (fr) |
EP (1) | EP0748442A1 (fr) |
JP (1) | JPH09510299A (fr) |
DE (1) | DE19500147A1 (fr) |
WO (1) | WO1996021148A1 (fr) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19735559A1 (de) * | 1997-08-16 | 1999-02-18 | Bosch Gmbh Robert | Gasmeßfühler |
JP3648381B2 (ja) * | 1998-06-04 | 2005-05-18 | 日本特殊陶業株式会社 | ガスセンサ及びその製造方法 |
JP3994561B2 (ja) * | 1998-08-12 | 2007-10-24 | 株式会社デンソー | ガスセンサ |
DE19937160C2 (de) * | 1999-08-06 | 2003-07-10 | Bosch Gmbh Robert | Gassensor, insbesondere für Abgase von Brennkraftmaschinen, und Verfahren zu dessen Herstellung |
DE10123168C1 (de) * | 2001-05-12 | 2002-11-07 | Bosch Gmbh Robert | Dichtungsanordnung für einen Gasmeßfühler und Verfahren zur Herstellung der Dichtungsanordnung |
DE10222789B4 (de) * | 2002-05-23 | 2006-12-07 | Robert Bosch Gmbh | Gasmeßfühler |
JP4068426B2 (ja) * | 2002-09-30 | 2008-03-26 | 日本特殊陶業株式会社 | センサおよびセンサ製造方法 |
DE10259524B4 (de) * | 2002-12-19 | 2006-07-20 | Robert Bosch Gmbh | Gasmessfühler |
DE102005051704A1 (de) * | 2005-10-28 | 2007-05-03 | Robert Bosch Gmbh | Gasmessfühler und Verfahren zur Herstellung des Gasmessfühlers |
US8658013B2 (en) * | 2005-12-01 | 2014-02-25 | Delphi Technologies, Inc. | Sensor and sensing method |
DE102006015427B3 (de) * | 2006-03-31 | 2007-11-29 | Anton Gensler Gmbh | Messfühler für Hochtemperaturanwendungen |
JP4018733B2 (ja) * | 2006-11-16 | 2007-12-05 | 日本特殊陶業株式会社 | ガスセンサ |
US20080118423A1 (en) * | 2006-11-17 | 2008-05-22 | Fattic Gerald T | Closed loop control of air/fuel ratio in a reformer for modulating diesel exhaust |
DE102010050802A1 (de) | 2010-11-09 | 2012-05-10 | Tesona Gmbh & Co. Kg | Messfühleranordnung zur Bestimmung mindestens einer Messgröße |
JP6796462B2 (ja) * | 2016-11-16 | 2020-12-09 | 東京窯業株式会社 | 固体電解質センサ及び固体電解質センサの製造方法 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2343428A1 (de) * | 1972-03-10 | 1975-03-13 | Bosch Gmbh Robert | Elektrochemischer messfuehler fuer die bestimmung des sauerstoffgehaltes in abgasen, insbesondere in abgasen von verbrennungsmotoren |
FR2215873A6 (fr) * | 1973-01-30 | 1974-08-23 | Bosch Gmbh Robert | |
DE2343429A1 (de) * | 1973-08-29 | 1975-03-13 | Bosch Gmbh Robert | Elektrochemischer messfuehler |
DE2632249C3 (de) * | 1976-07-17 | 1981-05-14 | Brown, Boveri & Cie Ag, 6800 Mannheim | Elektrochemischer Meßfühler |
US4119513A (en) * | 1977-03-07 | 1978-10-10 | Uop Inc. | Oxygen sensor for industrial air/fuel control |
JPS5417414A (en) * | 1977-07-08 | 1979-02-08 | Nippon Soken Inc | Exhaust gas purifying system |
US4184934A (en) * | 1978-09-13 | 1980-01-22 | The Bendix Corporation | Protective shield having omni-directional diverter for sensing means |
US4229275A (en) * | 1979-07-09 | 1980-10-21 | Uop Inc. | Solid electrolyte oxygen sensor and method of making same |
DE3405162A1 (de) * | 1984-02-14 | 1985-08-22 | Bosch Gmbh Robert | Polarographischer sauerstoffmessfuehler |
JPS60183857U (ja) * | 1984-05-07 | 1985-12-06 | 株式会社デンソー | 酸素濃度検出器 |
JPH0754313B2 (ja) * | 1984-09-14 | 1995-06-07 | 株式会社日立製作所 | 酸素濃度検出器 |
US4818364A (en) * | 1987-04-13 | 1989-04-04 | Allied-Signal Inc. | Terminal member for 02 sensor |
AU614392B2 (en) * | 1988-10-31 | 1991-08-29 | Fujikura Ltd. | An oxygen sensor device |
DE3922331C2 (de) * | 1989-07-07 | 1998-12-03 | Bosch Gmbh Robert | Gasmeßfühler |
JP2708915B2 (ja) * | 1989-11-25 | 1998-02-04 | 日本特殊陶業株式会社 | ガス検出センサ |
EP0520528A1 (fr) * | 1991-06-10 | 1992-12-30 | General Motors Corporation | Sonde électrochimique d'oxygène pour des gaz d'échappement avec joint d'étanchéité céramique |
DE4318789A1 (de) * | 1993-06-05 | 1994-12-08 | Bosch Gmbh Robert | Dichtung für ein Sensorelement eines Gassensors |
DE4342731B4 (de) * | 1993-07-27 | 2004-09-09 | Robert Bosch Gmbh | Elektrochemischer Meßfühler mit einem potentialfrei angeordneten Sensorelement und Verfahren zu seiner Herstellung |
-
1995
- 1995-01-04 DE DE19500147A patent/DE19500147A1/de not_active Withdrawn
- 1995-12-18 WO PCT/DE1995/001809 patent/WO1996021148A1/fr not_active Application Discontinuation
- 1995-12-18 US US08/687,608 patent/US5755941A/en not_active Expired - Fee Related
- 1995-12-18 JP JP8520676A patent/JPH09510299A/ja active Pending
- 1995-12-18 EP EP95941593A patent/EP0748442A1/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9621148A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH09510299A (ja) | 1997-10-14 |
US5755941A (en) | 1998-05-26 |
WO1996021148A1 (fr) | 1996-07-11 |
DE19500147A1 (de) | 1996-07-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
17P | Request for examination filed |
Effective date: 19970113 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20010703 |