WO2014027642A1 - Capteur de gaz, et unité de capteur de gaz - Google Patents

Capteur de gaz, et unité de capteur de gaz Download PDF

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Publication number
WO2014027642A1
WO2014027642A1 PCT/JP2013/071810 JP2013071810W WO2014027642A1 WO 2014027642 A1 WO2014027642 A1 WO 2014027642A1 JP 2013071810 W JP2013071810 W JP 2013071810W WO 2014027642 A1 WO2014027642 A1 WO 2014027642A1
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WO
WIPO (PCT)
Prior art keywords
enclosure
gas sensor
glaze layer
rear end
ceramic
Prior art date
Application number
PCT/JP2013/071810
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English (en)
Japanese (ja)
Inventor
篤史 浅野
昌弘 浅井
Original Assignee
日本特殊陶業株式会社
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 日本特殊陶業株式会社 filed Critical 日本特殊陶業株式会社
Priority to CN201380043797.7A priority Critical patent/CN104583766A/zh
Priority to JP2013553712A priority patent/JPWO2014027642A1/ja
Publication of WO2014027642A1 publication Critical patent/WO2014027642A1/fr

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    • 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
    • G01N27/4077—Means for protecting the electrolyte or the electrodes

Definitions

  • the present invention relates to a gas sensor and a gas sensor unit having a gas detection element mainly made of ceramic.
  • gas sensors having a gas detection element made of ceramic or the like have been proposed.
  • gas sensors include a sensor that is attached to an exhaust pipe of an internal combustion engine and detects the oxygen concentration in the exhaust gas.
  • Patent Document 1 discloses a gas sensor in which the rear end side of the gas detection element is covered with a ceramic enclosure, and the ceramic enclosure outside the exhaust pipe is covered with a metal cylinder.
  • Patent Document 2 heat dissipation is improved by dividing a metal cylinder and providing a gap between the two, and dissipating heat through a ceramic enclosure exposed from the gap portion of the metal cylinder.
  • a gas sensor is disclosed.
  • Patent Document 3 by forming a glaze layer on the exposed portion of the ceramic enclosure, even if the ceramic enclosure gets wet while the vehicle is running, the ceramic enclosure is cracked or damaged by the thermal shock.
  • a gas sensor that suppresses occurrence is disclosed.
  • the ceramic enclosure P1 has a shape in which a flange-like large-diameter portion P3 is provided on the distal end side of the cylindrical small-diameter portion P2, that is, the small-diameter portion P2 and the diameter.
  • the outer surface of the boundary part with the most part P3 has a concave shape (since there is a concave part P4)
  • the glaze layer P5 on the ceramic enclosure P1 for example, spraying a glaze material or using a drum When applied, the glaze material accumulates in the concave portion P4 due to surface tension, and as a result, a thick glaze layer P5 is formed in the concave portion P4.
  • the ceramic enclosure P1 provided with the glaze layer P5 is fixed to the metal shell P7 by caulking through a metal packing P6 disposed on the outer surface of the concave portion P4 and the large diameter portion P3.
  • the packing P6 when the packing P6 is pushed and moved inward (ie, on the ceramic enclosure P1 side) during caulking, if the thick glaze layer P5 exists on the ceramic enclosure P1, the glaze layer P5 can withstand the load. It sometimes cracked.
  • the output of the gas sensor may be abnormal, or the gas sensor may break down.
  • the present invention in one aspect is a gas sensor including a gas detection element, a metal shell, and a ceramic enclosure.
  • the gas detection element extends in the axial direction, and the tip side is exposed to the gas to be measured.
  • the metal shell surrounds the periphery of the gas detection element.
  • the ceramic enclosure is a cylinder made of an insulating ceramic, surrounds the rear end side of the gas detection element, and protrudes from the rear end of the metal shell with the rear end side of the gas detection element interposed through a metal packing. And are fastened and fixed to the metal shell.
  • the ceramic enclosure has an enclosure body including an enclosure exposed part and an enclosure covering part.
  • the enclosure exposed portion is exposed to the outside on the rear end side from the rear end of the metal shell.
  • the enclosure covering portion is covered with the metal shell on the front end side with respect to the rear end of the metal shell.
  • the enclosure body has a glaze layer on its outer surface.
  • the glaze layer on the envelope covering portion has a recess that is recessed radially inward from the glaze layer on the envelope exposed portion.
  • the metal packing abuts at least a portion of the glaze layer other than the recess.
  • the envelope body includes a glaze layer on its outer surface, and the glaze layer on the envelope covering portion is a recess recessed inward in the radial direction from the glaze layer on the envelope exposed portion.
  • the glaze layer is recessed and thinned radially inward on the enclosure covering portion, and the glaze is accumulated and the glaze layer is not thick as in the prior art. It is difficult to hit the glaze layer on the enclosure cover.
  • the metal packing abuts on the glaze layer, it is configured not to abut on the concave portion of the glaze layer but on a portion other than the concave portion (such as around the concave portion). Therefore, when the ceramic enclosure provided with the glaze layer is caulked and fixed by the metal shell through the metal packing, even when a pressing force by caulking is applied (inward from the outside in the radial direction) In particular, no force is directly applied to the concave portion of the glaze layer on the enclosure covering portion.
  • the glaze layer on the enclosure covering portion is formed thinner (to be dented) than the glaze layer on the enclosure exposed portion, the metal packing is on the inside during caulking. Even if it is pushed and moved to make contact with a portion other than the concave portion of the glaze layer on the enclosure covering portion, the glaze layer is difficult to break because the load applied to the glaze layer is small.
  • the glaze layer is not easily cracked or broken, and thus the ceramic enclosure itself can be prevented from being damaged. As a result, it is possible to reduce the risk of an abnormality or failure in the output of the gas sensor.
  • the glaze layer on the exposed part of the enclosure can be particularly thickened. Therefore, even when the enclosure exposed portion (specifically, the glaze layer on the surface) is covered with water, the ceramic enclosure can be effectively prevented from being damaged by the thermal shock.
  • the surface shape of the recess has a radius of curvature of 1.0 mm or less.
  • the invention of this aspect defines a preferable shape of the recess. If the radius of curvature is within this range, the occurrence of cracks and the like in the glaze layer can be effectively suppressed.
  • the thickness of the glaze layer in the recess is in the range of 1 to 10 ⁇ m.
  • the invention of this aspect exemplifies a preferable thickness in the recess. If it is the glaze thickness of this range, generation
  • the thickness of the glaze layer means that it is within the range including the maximum and minimum thicknesses, not the average thickness.
  • the thickness in the concave portion indicates the thickness in the radial direction in a cross section obtained by breaking the ceramic enclosure perpendicularly to the axial direction.
  • the thickness of the glaze layer on the surrounding body exposed portion is in the range of 15 to 100 ⁇ m.
  • the invention of this aspect exemplifies a preferable thickness in the glaze layer of the enclosure exposed portion. If the thickness of the glaze is within this range, it is possible to reduce the thermal shock caused by water exposure and to effectively suppress the occurrence of cracks in the ceramic enclosure.
  • the present invention in still another aspect is a gas sensor unit including a gas sensor and a gas sensor cap.
  • the gas sensor has a gas detection element, a metal shell, a ceramic enclosure, and a terminal member.
  • the gas detection element extends in the axial direction, and the tip side is exposed to the gas to be measured.
  • the metal shell surrounds the gas detection element.
  • the ceramic enclosure is a cylinder made of an insulating ceramic, surrounds the rear end side of the gas detection element, and protrudes from the rear end of the metal shell with the rear end side of the gas detection element interposed through a metal packing. And are fastened and fixed to the metal shell.
  • the terminal member is connected to an inner electrode formed on the inner peripheral surface of the gas detection element, and outputs an output signal from the gas detection element to the outside.
  • the gas sensor cap has a cap terminal and an insulating part.
  • the cap terminal has a cylindrical shape, is connected to the terminal member of the gas sensor, and transmits the output signal to an external device.
  • the insulating portion covers the cap terminal and the rear end side of the ceramic enclosure and is made of an insulating elastic body.
  • This gas sensor unit uses any of the gas sensors described above as a gas sensor.
  • the gas sensor unit of this aspect is obtained by attaching a gas sensor cap to any of the gas sensors described above.
  • the exposed portion of the ceramic enclosure (specifically, the glaze layer on the surface) is exposed to the outside between the gas sensor and the gas sensor cap. So heat dissipation is excellent. Moreover, since the glaze layer is formed on the surface of the ceramic enclosure, it has high thermal shock resistance even when it is wet. Furthermore, since any one of the gas sensors described above is used as the gas sensor, the glaze layer and the ceramic enclosure are not easily damaged, and thus have high durability.
  • FIG. 4A is an explanatory view showing a state in which the glaze slurry is sprayed on the outer surface of the ceramic envelope in the manufacturing method of the glaze ceramic envelope
  • FIG. 4B is a diagram of the ceramic envelope in the manufacturing method of the glaze ceramic envelope.
  • FIG. 4C is an explanatory view showing a state in which the glaze material layer is formed on the outer surface
  • 4C is an explanatory view showing a state in which the glaze material layer is air blown and excess glaze slurry is removed in the manufacturing method of the glaze ceramic enclosure. It is. It is sectional drawing which shows the state which fractured
  • the lower side of FIG. 1 is the front end side of the gas sensor and the upper side is the rear end side.
  • the gas sensor 1 of this embodiment includes a gas detection element 3, an outer electrode 5, an inner electrode 7, a ceramic enclosure 9, a terminal member 11, and a casing 13.
  • the casing 13 has a metal shell 15 and a protector 17.
  • the metal shell 15 is made of SUS430 and has a substantially cylindrical shape. Inside the metal shell 15, an inner peripheral receiving portion 21 for supporting the flange portion 19 of the gas detection element 3 is provided.
  • a screw part 25 for attaching the gas sensor 1 to the exhaust pipe 23 (see FIG. 6) is formed outside the metal shell 15, and the screw part 25 is connected to the exhaust pipe 23 at the rear end side of the screw part 25.
  • a hexagonal portion 27 for screwing is provided around.
  • the protector 17 is a metal, substantially cylindrical cylinder, and has a vent hole 29 for introducing the exhaust gas in the exhaust pipe 23 into the gas sensor 1.
  • the gas detection element 3 is made of a solid electrolyte having oxygen ion conductivity, and is fixed in a state of being inserted into the metal shell 15.
  • the gas detection element 3 has a substantially cylindrical shape with the tip 31 closed and extending in the axis A direction. Further, the outer periphery of the gas detection element 3 is provided with a flange portion 19 protruding outward in the radial direction, and between the front end surface of the flange portion 19 and the surface of the inner periphery receiving portion 21 of the metal shell 15.
  • a first packing 33 made of metal is disposed.
  • the solid electrolyte constituting the gas detecting element 3 for example, ZrO 2 in which Y 2 O 3 or CaO is dissolved is representative, but oxidation of other alkaline earth metals or rare earth metals is typical.
  • a solid solution of the product and ZrO 2 may be used.
  • HfO 2 may be contained therein.
  • the outer electrode 5 is a porous Pt or Pt alloy, and is provided so as to cover the outer surface 35 of the tip 31 of the gas detection element 3.
  • the outer electrode 5 is provided up to the distal end surface of the flange portion 19 and is electrically connected to the metal shell 15 via the first packing 33.
  • the inner electrode 7 is also a porous Pt or Pt alloy, and is provided so as to cover the inner surface 37 of the gas detection element 3.
  • the ceramic enclosure 9 is made of an insulating ceramic (specifically, alumina) and has a substantially cylindrical shape.
  • the ceramic enclosure 9 has a cylindrical large-diameter portion 39 protruding radially outward on the front end side, and a cylindrical small-diameter portion 41 located on the rear end side of the large-diameter portion 39. Between the large portion 39 and the small-diameter portion 41, a rear end-facing tapered surface 43 facing the rear end side in the axis A direction is formed.
  • a glaze layer 47 (see FIG. 2) is formed on the outer surface 45 in the radial direction of the rear end-facing tapered surface 43 and the small-diameter portion 41 of the large-diameter portion 39, as will be described in detail later.
  • the ceramic enclosure 9 in which the glaze layer 47 is formed on the outer surface is referred to as a glaze ceramic enclosure 10.
  • the large diameter portion 39 of the ceramic enclosure 9 surrounds the periphery of the rear end side of the gas detection element 3 and is interposed between the gas detection element 3 and the metal shell 15 together with the ceramic powder 49 formed from talc. ing.
  • a second metal packing (metal packing) 53 that is a caulking ring is disposed on the rear end side of the rear end-facing tapered surface 43, and the caulking portion 55 located at the rear end of the metal shell 15 is disposed on the inner side.
  • the second packing 53 is pressed toward the taper surface 43 toward the rear end of the ceramic enclosure 9 (specifically, the glaze layer 47), and the ceramic enclosure 9 is caulked and fixed to the metal shell 15. .
  • the second packing 53 is an annular metal packing made of, for example, SUS430 and having a radius (radius of an inner peripheral portion) of 5 mm.
  • the cross section of the second packing 53 (cross section along the axis center) is circular, and the radius of the cross section is, for example, 0.4 mm.
  • the terminal member 11 is made of, for example, Inconel 750 (English Inconel, trade name), has a substantially cylindrical shape, and includes an output-side terminal portion 57, an element-side terminal portion 59, and a connecting portion 61 that connects the two. .
  • the output side terminal portion 57 has a substantially C-shaped cross section perpendicular to the axial direction, and the cap terminal 65 (see FIG. 5) of the cap terminal member 63 is inserted and connected to the inside. In addition, it is configured to elastically expand its diameter.
  • the element side terminal portion 59 has a cylindrical shape with a substantially C-shaped cross section orthogonal to the axial direction.
  • the element-side terminal portion 59 is inserted into the gas detection element 3 while being elastically reduced in diameter, and is electrically connected to the inner electrode 7.
  • the glaze ceramic enclosure 10 which is a main part of the present embodiment will be described in detail based on FIGS. 2 and 3. 2, the glaze ceramic enclosure 10 includes a ceramic enclosure 9 and a glaze layer 47 formed on a part of the outer surface thereof.
  • the ceramic enclosure 9 includes a small-diameter portion 41 on the rear end side and a large-diameter portion 39 on the front end side, and an enclosure corner portion 67 that connects between the small-diameter portion 41 and the large-diameter portion 39.
  • an annular recess 71 that is cut out in an annular shape is formed at the boundary between the outer peripheral surface 69 of the large-diameter portion 39 and the taper surface 43 facing the rear end.
  • the glaze layer 47 is formed from the outer surface of the ceramic enclosure 9 by the envelope corner portion 67 from the tapered surface 43 toward the rear end of the large diameter portion 39. It is formed over the rear end of the outer surface 45 of the small-diameter portion 41.
  • the portion exposed to the outside above (backward) the upper end (rear end) of the metal shell 15 corresponds to the enclosure exposed portion 9 ⁇ / b> A (see FIG. 6).
  • the portion below the upper end (up to the intersection of the annular recess 71 and the large diameter portion 39) corresponds to the enclosure covering portion 9B.
  • the enclosure body 9C is composed of the enclosure exposure part 9A and the enclosure cover 9B.
  • the upper end to the upper end of the enclosure corner portion 67 is referred to as an upper enclosure covering portion 9b.
  • This glaze layer 47 is, for example, SiO 2 : 77.5 wt%, Al 2 O 3 : 12.1 wt%, MgO: 3.4 wt%, K 2 O: 5.4 wt%, Na 2 O: 1.4 wt% , CaO: 0.1 wt%, Fe 2 O 3 : 0.1 wt%.
  • the thickness of the glaze layer 47 is not uniform, and the glaze layer 47 is radially inward on the outer surface of the envelope covering portion 9B (especially on the outer surface of the envelope corner portion 67).
  • the concave portion 73 is formed so that the thickness of the glaze layer 47 on the envelope covering portion 9B is smaller than the thickness of the glaze layer 47 on the envelope exposed portion 9A.
  • the concave portion 73 of the glaze layer 47 becomes The shape is such that it completely enters the glaze layer 47 on the surrounding body exposed portion 9A.
  • the thickness of the glaze layer 47 on the outer surface 45 on the enclosure exposed portion 9A is, for example, 20 ⁇ m within the range of 15 to 100 ⁇ m, but the thickness of the glaze layer 47 in the recess 73 is thinner than 1 to 10 ⁇ m. Within range.
  • the thickness of the glaze layer 47 gradually decreases as it goes from the concave portion 73 toward the distal end side (downward in FIG. 3). Furthermore, the curvature radius of the outer surface of the recess 73 is 1.0 mm or less, for example, 0.6 mm.
  • the range of the surrounding corner portion 67 is, as viewed in a cross section along the axis A as shown in FIG. 3, the outer surface 45 of the linear small-diameter portion 41 and the linear rear end-facing tapered surface 43.
  • the concave portion 73 is thinner on the outer surface of the surrounding corner portion 67 than the thickness of the glaze layer 47 on the surrounding body exposed portion 9A, and has a diameter. It has a concave part that curves inward.
  • the second packing 53 is disposed on the glaze layer 47 on the tapered surface 43 facing the rear end of the large diameter portion 39, and the second packing 53 is a caulking portion 55 of the metal shell 15. Is crimped inside.
  • the second packing 53 is disposed apart from the recess 73. That is, since the second packing 53 is not in contact with the concave portion 73, the concave portion 73 on the enclosure covering portion 9 ⁇ / b> B is applied even when a pressing force is applied by the inner portion 15 of the metal shell 15. On the other hand, no direct pressure is applied.
  • Method for producing ceramic enclosure 9 In the case of manufacturing the ceramic enclosure 9, first, an insulating ceramic powder such as alumina is blended at a predetermined ratio, and this is molded by known press molding or extrusion molding, whereby the original shape of the ceramic enclosure 9 is obtained. Make a molded body to become. In some cases, the molded body may be cut in a cutting process.
  • this molded body is fired at a predetermined temperature to produce a ceramic enclosure 9.
  • Method for forming the glaze layer 47 Next, a method for forming the glaze layer 47 will be described with reference to FIGS. 4A-4C.
  • the glaze material of the above-mentioned components is dissolved in water or a solvent to prepare a glaze slurry.
  • the glaze slurry is sprayed from the spray nozzle 81 onto the outer surface of the ceramic enclosure 9.
  • a glaze material layer 83 is formed on the outer surface of the ceramic enclosure 9, specifically, the outer surface 45 of the small-diameter portion 41 and the tapered surface 43 facing the rear end. At this time, the thickness of the glaze material layer 83 increases on the surrounding corner portion 67 due to the surface tension.
  • the glaze material layer 83 is air blown to remove excess glaze slurry from above the enclosure corners 67 and the like.
  • the air nozzle 85 jets air along the surface of the taper surface 43 toward the rear end, removes the surface portion of the glaze slurry on the taper surface 43 toward the rear end, and removes excess from the corner portion 67 of the enclosure body. Remove the glaze slurry.
  • the thickness of the glaze material layer 83 on the rear end-facing tapered surface 43 and the glaze material layer 83 on the enclosure corner portion 67 are made thinner than the thickness of the glaze material layer 83 on the small-diameter portion 41.
  • the glaze material layer 83 has a concave shape (the shape of the concave portion 73) on the outer surface of the enclosure corner portion 67.
  • the glaze layer 47 having the shape of the present embodiment is formed by firing at a predetermined temperature.
  • the glaze ceramic enclosure 10 is produced.
  • the ceramic enclosure 9 can be immersed in a water tank containing a glaze slurry, or the ceramic enclosure 9 can be brought into contact with a rotating body on which the glaze slurry is applied. And a method of rotating the rotating body.
  • a method for forming another glaze layer the following methods may be mentioned.
  • a casing 13 in which a metal shell 15 and a protector 17 are integrated is prepared.
  • the gas detection element 3 provided with the outer electrode 5 and the inner electrode 7 is inserted into the casing 13 together with the first packing 33.
  • a predetermined amount of ceramic powder 49 is filled in the gap portion between the metal shell 15 and the gas detection element 3 on the rear end side of the flange portion 19 of the gas detection element 3.
  • the glaze ceramic enclosure 10 (produced through the above-described process) is inserted so as to be interposed between the gas detection element 3 and the metal shell 15, and the tip surface is brought into contact with the ceramic powder 49.
  • the second packing 53 is interposed between the crimped portion 55 of the metal shell 15 and the glaze ceramic enclosure 10 by crimping the rear end side of the metal shell 15 to form the crimped portion 55.
  • the above-mentioned components are fixed together.
  • the terminal member 11 is inserted inside the glaze ceramic enclosure 10 and the gas detection element 3.
  • the element-side terminal portion 59 is inserted into the gas detection element 3 while being elastically reduced in diameter, and is electrically connected to the inner electrode 7.
  • the output side terminal portion 57 is disposed inside and in contact with the glaze ceramic enclosure 10.
  • the gas sensor cap 91 includes a cap terminal member 63, an insulating portion 93 that covers the cap terminal member 63, and a lead wire 95.
  • the cap terminal member 63 is made of, for example, SUS310S, and includes a substantially cylindrical cap terminal 65 and a caulking portion 99 for caulking and connecting the lead wire 95.
  • the cap terminal 65 has rigidity to expand the diameter of the output side terminal portion 57 without being deformed itself when inserted into the output side terminal portion 57 of the gas sensor 1 and connected thereto.
  • One end of the lead wire 95 is crimped by a crimping portion 99 of the cap terminal member 63 and is electrically connected to the cap terminal 65. For this reason, the output signal from the gas detection element 3 of the gas sensor 1 can be transmitted to the external device through the lead wire 95.
  • the insulating part 93 is formed into a hollow shape using a fluorine-based rubber, and the insulating part 93 has a close contact part 97.
  • the gas sensor cap 91 is configured in such a manner that a cap terminal member 63 is disposed coaxially with the close contact portion 97 in an insulating portion 93 and a lead wire 95 connected to the cap terminal member 63 extends from the insertion port 101 to the outside. Has been.
  • the gas sensor unit 111 has a gas sensor cap 91 fitted on the rear end side of the gas sensor 1 and is attached to the exhaust pipe 23 in order to detect the oxygen concentration in the exhaust gas of the internal combustion engine. Used.
  • the gas sensor 1 is screwed to the exhaust pipe 23 in such a manner that the front end side including the protector 17 is located in the exhaust pipe 23 and the rear end side portion of the metal shell 15 is exposed to the outside.
  • the outer electrode 5 electrically connected to the metal shell 15 is grounded through the metal shell 15.
  • the gas sensor cap 91 is attached to the gas sensor 1 such that the cap terminal 65 of the gas sensor cap 91 is inserted into the output side terminal portion 57 of the gas sensor 1.
  • this exposed part is the enclosure exposed part (water covered part) 9A.
  • the ceramic enclosure 9 extends from the outer surface 45 in the radial direction of the small-diameter portion 41 to the tapered surface 43 toward the rear end of the large-diameter portion 39 via the outer surface of the enclosure corner portion 67.
  • the glaze layer 47 is formed, and the glaze layer 47 on the enclosure covering portion 9B has a recess 73 that is recessed radially inward so as to be smaller than the thickness on the enclosure exposed portion 9A.
  • the concave portion 73 (for example, the concave portion on the surrounding corner portion 67) 73 of the glaze layer 47 is recessed radially inward. Therefore, it cannot be visually recognized.
  • the glaze layer 47 is recessed inwardly on the envelope corner portion 67 or the like to form a recess 73, and the glaze layer 47 is accumulated in the envelope corner portion 67 as in the conventional case. Since it is not thick, it is difficult for the second packing 53 to hit the concave portion 73 such as on the surrounding corner portion 67.
  • the glaze layer 47 on the enclosure covering portion 9B is formed thin (to be recessed), the second packing 53 is pushed and moved inward (axial center side) during caulking. In this case, even if contact is made at a part other than the recess 73, the glaze layer 47 is difficult to break because the load applied to the glaze layer 47 is small.
  • the glaze layer 47 is not easily cracked or broken, and therefore the damage of the ceramic enclosure 9 itself can be suppressed. As a result, it is possible to reduce the risk of abnormality or failure in the output of the gas sensor 1 or the like.
  • the surface shape of the recess 73 has a radius of curvature of 1.0 mm or less. If the radius of curvature is within this range, the occurrence of cracks and the like in the glaze layer 47 can be effectively prevented.
  • the thickness of the concave portion 73 of the glaze layer 47 is in the range of 1 to 10 ⁇ m. If it is the glaze thickness of this range, generation
  • the thickness of the glaze layer 47 on the enclosure exposed portion 9A is in the range of 15 to 100 ⁇ m at any part. If the thickness of the glaze is within this range, it is possible to reduce the thermal shock caused by water exposure and to effectively suppress the occurrence of cracks and the like in the ceramic enclosure 9.
  • the gas sensor unit 111 is obtained by attaching the gas sensor cap 91 to the gas sensor 1 described above.
  • the enclosure exposed portion 9A of the ceramic enclosure 9 is exposed to the outside between the gas sensor 1 and the gas sensor cap 91.
  • the property is excellent.
  • the glaze layer 47 is formed on the surface of the ceramic enclosure 9, it has high thermal shock resistance even when it is wet.
  • the gas sensor 1 having the above-described structure is used as the gas sensor 1, the glaze layer 47 and the ceramic enclosure 9 are not easily damaged, and thus have high durability.
  • the second packing 53 corresponds to an example of a metal packing.
  • the thickness of the glaze layer 47 was examined.
  • the glaze thickness is a dimension in a direction perpendicular to the axial direction. The result is shown in the invention example of FIG.
  • the thickness of the glaze layer 47 on the upper envelope covering portion 9b is smaller than the thickness of the glaze layer 47 on the envelope exposed portion 9A. (That is, the recess 73 is formed). Therefore, as described above, it can be seen that the occurrence of cracks in the glaze layer 47 can be suppressed.
  • the thickness of the glaze layer on the upper envelope covering portion is larger than the thickness of the glaze layer on the envelope exposed portion.
  • the gas sensor 1 having the same structure as that of the above embodiment is manufactured, and the shape of the concave portion 73 of the glaze layer 47 is adjusted by adjusting the air blow when forming the glaze layer 47. That is, the radius (R) of the recess 73 was changed. Except for the recess 73, the second packing 53 and the like are the same as in the above embodiment.
  • gas sensors of sample Nos. 1 to 7 (radius R of the recess 73 is 0.4 to 1.0 mm) were manufactured as examples of the present invention.
  • sample Nos. 8 to 12 gas sensors (the radius R of the recesses was 1.1 to 1.5 mm) were produced.

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Abstract

L'invention fournit un capteur de gaz et une unité de capteur de gaz permettant d'empêcher l'apparition de fissures ou de fractures dans une couche de glacis, y compris lorsqu'un corps enveloppé de céramique qui est équipé d'une couche de glacis sur sa surface externe, est fixé sur un accessoire principal. Le capteur de gaz est équipé d'un élément de détection de gaz, de l'accessoire principal, et du corps enveloppé de céramique. Le corps enveloppé de céramique possède une partie intermédiaire de corps enveloppé qui est équipée d'une partie exposition de corps enveloppé et d'une partie revêtement de corps enveloppé. Cette partie intermédiaire de corps enveloppé est équipée de la couche de glacis sur sa surface externe. Ladite couche de glacis au niveau de ladite partie revêtement de corps enveloppé, possède une partie en retrait davantage creusée côté interne dans la direction radiale que ladite couche de glacis au niveau de ladite partie exposition de corps enveloppé. Une garniture métallique vient en contact au moins dans une région en dehors de ladite partie en retrait de ladite couche de glacis.
PCT/JP2013/071810 2012-08-17 2013-08-12 Capteur de gaz, et unité de capteur de gaz WO2014027642A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201380043797.7A CN104583766A (zh) 2012-08-17 2013-08-12 气体传感器及气体传感器单元
JP2013553712A JPWO2014027642A1 (ja) 2012-08-17 2013-08-12 ガスセンサ及びガスセンサユニット

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Application Number Priority Date Filing Date Title
JP2012181169 2012-08-17
JP2012-181169 2012-08-17

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WO2014027642A1 true WO2014027642A1 (fr) 2014-02-20

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JP7269834B2 (ja) * 2019-08-28 2023-05-09 京セラ株式会社 ガス検出装置

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JP2007107935A (ja) * 2005-10-11 2007-04-26 Ngk Spark Plug Co Ltd センサユニット及びセンサキャップ
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