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WO2018155119A1 - Capteur de gaz - Google Patents

Capteur de gaz Download PDF

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Publication number
WO2018155119A1
WO2018155119A1 PCT/JP2018/003334 JP2018003334W WO2018155119A1 WO 2018155119 A1 WO2018155119 A1 WO 2018155119A1 JP 2018003334 W JP2018003334 W JP 2018003334W WO 2018155119 A1 WO2018155119 A1 WO 2018155119A1
Authority
WO
WIPO (PCT)
Prior art keywords
heater
unit
gas
sensor
region
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/JP2018/003334
Other languages
English (en)
Japanese (ja)
Inventor
賢治 西尾
七田　貴史
上木　正聡
井上　剛
貴之 熊崎
青山　惠哉
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.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
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 NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Publication of WO2018155119A1 publication Critical patent/WO2018155119A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • 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
    • G01N27/416—Systems

Definitions

  • the present invention relates to a gas sensor that detects the concentration of a specific gas component contained in a gas to be measured.
  • Patent Document 1 a technique in which NO in the exhalation is converted to NO 2 by a catalyst, and then this NO 2 is detected by a sensor element.
  • a conversion unit that performs pretreatment using a catalyst and a detection unit that includes a sensor element are formed separately, and are integrated into a single unit. Then, by providing heaters (heating resistors) separately for the conversion unit and the sensor element, the conversion unit and the sensor element are heated and stably operated.
  • an object of the present invention is to provide a gas sensor that includes a single heater to improve the detection accuracy of a specific gas component, and can realize downsizing and power saving.
  • the gas sensor of the present invention is provided with a first chamber for introducing the gas to be measured therein, and the first gas contained in the gas to be measured introduced into the first chamber.
  • An adjustment unit including a conversion unit that converts a gas component into a second gas component, and a second chamber for introducing the gas to be measured that has passed through the adjustment unit are provided therein, and the second gas component
  • a sensor unit having a detection unit whose electrical characteristics change according to the concentration of the ceramic unit, a ceramic wiring board in which the detection unit is arranged and at least a part of the sensor unit is housed in the sensor unit, the conversion unit, And a single heater for heating the detection unit, and in the region of the ceramic wiring board where the detection unit is arranged, in the thickness direction of itself At least one through hole is formed, and the through hole is filled with a heat transfer material having a higher thermal conductivity than the ceramic material constituting the ceramic wiring board, and the adjustment unit, the heater, and
  • the adjustment unit, the sensor unit, and the heater are configured such that
  • the adjustment unit and the sensor unit need only be heated with a single heater, so that the configuration of the gas sensor can be simplified and the size of the gas sensor can be reduced compared to the case where the heaters are provided separately for both units. Can be realized. Also, the adjustment unit and the heater, and the sensor unit and the heater are respectively thermally coupled, and at least a part of the heater overlaps with the region when viewed in the extending direction of the through hole. For this reason, between at least one of the units and the heater, the heat of the heater is easily transferred to the unit through a region (that is, a heat transfer material) having a higher thermal conductivity than the surrounding ceramic wiring board. Both units can be reliably heated with low power with a single heater. *
  • the specific component can be detected stably, and the detection accuracy of the specific component can be improved.
  • the thermal conductivity of the region can be easily controlled, and the amount of heat of the heater transmitted to both units can be easily adjusted.
  • the adjustment unit and the sensor unit can be easily controlled to different temperatures. In order to heat both units with a lower power with a single heater, it is preferable to provide a plurality of through holes.
  • the thickness of the region may be smaller than the thickness of the ceramic wiring board adjacent to the region. According to this gas sensor, since the thermal conductivity of the region is further increased, both units can be reliably heated with lower power with a single heater.
  • the main component of the ceramic material may be zirconia. Since zirconia has a low thermal conductivity among ceramic materials, the heat of the heater is preferentially transmitted to areas with high thermal conductivity, and heat dissipation can be further suppressed in the direction of the surface of the ceramic wiring board, saving power. Can be realized even more. *
  • the heat transfer material may be nonconductive. According to this gas sensor, since the non-conductive material has a high thermal conductivity, the heat of the heater is preferentially transmitted to the region having a high thermal conductivity, and the heat is dissipated in the direction of the surface of the ceramic wiring board. Further suppression can be achieved, and further power saving can be realized.
  • the present invention it is possible to obtain a gas sensor that can improve the accuracy of detection of a specific gas component and can achieve downsizing and power saving.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG. It is a partial section perspective view of a gas sensor concerning an embodiment of the present invention. It is a schematic diagram which shows the heat-transfer path
  • FIG. 1 is an exploded perspective view of a gas sensor 1 according to an embodiment of the present invention
  • FIG. 2 is a sectional view taken along the line AA of FIG. 1
  • FIG. 3 is a partial sectional perspective view of the gas sensor 1
  • FIG. It is a schematic diagram which shows a heat transfer path
  • the gas sensor 1 includes an adjustment unit 10, a sensor unit 20, a pipe-shaped gas flow pipe 40, and a plate-shaped ceramic wiring substrate 50, and is formed in a box shape as a whole. *
  • the adjustment unit 10 is formed in a substantially rectangular box shape with a flange and a metal case 12 having an upper surface (a surface facing upward in FIG. 1) and an adhesive (not shown) attached to the flange of the case 12.
  • the ceramic substrate 50 closes the opening of the case 12 by fixing the flange of the case 12 and the outer peripheral portion of the lower surface of the ceramic wiring substrate 50 to the frame of the packing 13 via an adhesive (not shown).
  • the internal space of the case 12 forms the first chamber C1.
  • a pipe-like inlet 12a and outlet 12b that serve as piping connection ports protrude from the lower surface of the case 12 so as to be spaced apart from each other, and the inlet 12a and outlet 12b communicate with the first chamber C1.
  • a conversion unit 14 having a rectangular parallelepiped shape and porous and permeable to gas is disposed, and the surface of the first chamber C1 is disposed on the surface of the conversion unit 14.
  • a sealing material 14a made of inorganic fiber (for example, alumina fiber) that seals the gap with the wall surface is provided.
  • the 1st gas component contained in the to-be-measured gas G is converted into the 2nd gas component, Then, from the outlet 12b It is discharged outside the adjustment unit 10.
  • the conversion unit 14 includes a catalyst such as zeolite supporting Pt that converts the first gas component (specifically NO) contained in the exhaled breath G into the second gas component (specifically NOx 2 ).
  • the sensor unit 20 includes a metal case 22 having the same or similar shape as the case 12 and having an open bottom surface, a rectangular frame-shaped packing 23 stacked on the flange of the case 22, and a sensor element unit housed in the case 22. 24, an adhesive layer 26 for bonding the sensor element portion 24 to a predetermined position (a recessed portion 50r described later) of the ceramic wiring substrate 50, and the ceramic wiring substrate 50.
  • the flange of the case 22 and the outer peripheral portion of the upper surface of the ceramic wiring board 50 are fixed to the frame of the packing 23 via an adhesive (not shown), so that the ceramic wiring board 50 closes the opening of the case 22.
  • the internal space of the case 22 forms the second chamber C2. *
  • the sensor element portion 24 has a substantially rectangular plate shape, and as shown in FIG. 2, a detection portion 24a is disposed on the upper surface (surface facing upward in FIG. 1) side of the base portion 24c, and a single surface is formed on the lower surface side of the base portion 24c.
  • One heater 24b is disposed, and the detection unit 24a and the heater 24b are integrated with each other on the top and bottom of the base unit 24c.
  • a recess 50r is formed in the center of the upper surface of the ceramic wiring substrate 50, and the sensor element portion 24 is arranged so that the heater 24b side is in contact with the recess 50r through the adhesive layer 26.
  • a pipe-like inlet 22a and outlet 22b that serve as connection ports for piping protrude from the upper surface of the case 22 apart from each other, and the inlet 22a and outlet 22b communicate with the second chamber C2.
  • the sensor element unit 24 is disposed between the inlet 22a and the outlet 22b in the second chamber C2 when viewed along the longitudinal direction of the ceramic wiring substrate 50, and the inlet 22a is connected to the outlet 12b through the gas flow pipe 40. Has been. Then, the gas G to be measured that has been converted to the second gas component through the adjustment unit 10 is introduced into the second chamber C2 from the inlet 22a through the gas flow pipe 40, and comes into contact with the detection unit 24a to be second. After the concentration of the gas component is measured, the gas component is discharged from the outlet 22b to the outside of the sensor unit 20. *
  • the detection unit 24a detects the concentration of the second gas component by detecting an electrical signal that changes in electrical characteristics according to the concentration of the second gas component.
  • the heater 24b heats the detection unit 24a to the operating temperature by energization heating.
  • the output terminal of the detector 24a and the energization terminal of the heater 24b are electrically connected to the ceramic wiring board 50 by wire bonding (not shown).
  • the base portion 24c can be configured using, for example, an insulating ceramic substrate.
  • the detection part 24a can be made into the NOx sensor element which consists of a well-known mixed potential type sensor provided with the solid electrolyte body and a pair of electrode, for example.
  • As the heater 24b for example, a heating resistor composed of a meandering conductive pattern formed on the surface of the base portion 24c can be adopted. *
  • the end portion 50e (left side in FIG. 1) of the ceramic substrate 50 is narrower than the cases 12 and 22, and extends to the outside of the cases 12 and 22 (left side in FIG. 1).
  • On the front and back surfaces there are a plurality of electrode pads 50p that are electrically connected to the detection unit 24a and the heater 24b through the wire bonding and wiring (lead conductor) formed on the surface of the ceramic wiring substrate 50.
  • the electric signal output from the detection unit 24 is output to the outside through the electrode pad 50p of the ceramic wiring substrate 50, and the heater 24b is energized and heated by the electric power supplied from the outside through the electrode pad 50p.
  • the sensor element unit 24 including the detection unit 24a is disposed in the central region 50A of the recess 50r of the ceramic wiring substrate 50. In the region 50A, a plurality of through-holes penetrating in the plate thickness direction (in FIG. 3, 4 ⁇ 8 ⁇ 32 in total) are formed, and each through-hole is filled with the heat transfer material 30. Yes.
  • the heat transfer material 30 has a higher thermal conductivity than the ceramic material constituting the ceramic wiring substrate 50.
  • the ceramic wiring board 50 is made of zirconia, and the main component of the ceramic material constituting the ceramic wiring board 50 is zirconia.
  • the ceramic wiring substrate 50 may contain zirconia as a main component and a ceramic material as a subcomponent.
  • the heat transfer material 30 is made of W (tungsten). W has higher thermal conductivity than zirconia. For this reason, the thermal conductivity in the region 50A is higher than the thermal conductivity in the ceramic wiring substrate 50 adjacent to the region 50A.
  • the ceramic wiring board 50 includes conductive members such as wiring (lead conductors), but these do not correspond to “a ceramic material constituting the ceramic wiring board 50”.
  • the heat transfer material 30 examples include metal materials such as Cu and W.
  • the heat transfer material 30 can be formed by filling a paste containing these materials into a through hole opened in a green sheet of an unfired ceramic wiring board 50 and firing the ceramic wiring board 50 at the same time. Further, the heat transfer material 30 can be formed in a cylindrical shape having a diameter of about 0.1 to 0.5 mm, for example, and the heat transfer materials 30 can be arranged at intervals of about 1 mm, for example.
  • the main component of the ceramic material constituting the ceramic wiring board 50 includes mullite and alumina in addition to zirconia. *
  • the sensor unit 20 and the heater 24 b are integrated by stacking and integrating the heater 24 b via the detection unit 24 a and the base unit 24 c in the sensor unit 20. It is thermally coupled like
  • the heater 24b completely overlaps the region 50A.
  • the adjustment unit 10 and the heater 24b are integrated as shown in the arrow H2 by the heater 24b being laminated and integrated with the conversion unit 14 in the adjustment unit 10 via the adhesive layer 26 and the region 50A. Thermally coupled.
  • the sensor unit 20 and the heater 24b are thermally coupled” means that any member constituting the sensor unit 20 and the heater 24b are coupled without interposing air (without a gap), thereby conducting heat conduction. Means that is possible. The same applies to the meaning of “adjustment unit 10 and heater 24b are thermally coupled”.
  • the adjustment unit 10 and the sensor unit 20 need only be heated by the single heater 24b, so that the gas sensor 1 can be reduced in size and power can be saved as compared with the case where the heaters are separately provided in both units. .
  • the sensor unit 20 and the heater 24b are integrated, the heat of the heater 24b arranged in the sensor unit 20 is easily transmitted to the detection unit 24a as indicated by an arrow H1 in FIG.
  • the sensor unit 20 and the adjustment unit 10 are thermally coupled via the region 50A, the heat of the heater 24b passes through the region 50A having a higher thermal conductivity than the surrounding ceramic wiring substrate 50 as indicated by the arrow in FIG. It is easily transmitted to the adjustment unit 10 (converter 14) through H2.
  • both units 10 and 20 can be reliably heated with low power by a single heater 24b.
  • the detection unit 24a of the sensor unit 20 can be heated to the operating temperature with the heater 24b in this way, the second gas component can be detected stably, and the detection accuracy can be improved.
  • the thermal conductivity of the region 50A can be easily controlled.
  • the heater 24b is plate-shaped, has a lower surface and an upper surface facing each other, the conversion unit 14 is disposed on the lower surface side, and the detection unit 24a is disposed on the upper surface side. Is arranged. Thereby, since the conversion unit 14 and the detection unit 24a are arranged on both surfaces of the heater 24b, the heat of the heater 24b can be transmitted to the conversion unit 14 and the detection unit 24a without waste, and further power saving can be realized. Further, a part of the constituent members for constituting the first chamber C1 of the adjustment unit 10 and a part of the constituent members for constituting the second chamber C2 of the sensor unit 20 are common ceramic members. Part 50r. Thereby, the number of parts of the gas sensor 1A can be reduced by the ceramic thin plate portion 50r which is a common member, and the gas sensor 1A can be further downsized. *
  • the thickness of the region 50A is thinner than the thickness of the ceramic wiring board 50 adjacent to the region 50A.
  • the thermal conductivity of the region 50A is further increased, both the units 10 and 20 can be reliably heated with lower power by the single heater 24b.
  • the main component of the ceramic material constituting the ceramic wiring substrate 50 (a component exceeding 50 mass% of the ceramic material) is zirconia. Since zirconia has a low thermal conductivity among ceramic materials, the heat of the heater 24b is preferentially transmitted to the region 50A having a high thermal conductivity, and heat dissipation in the direction of the plate surface of the ceramic wiring board 50 can be further suppressed. Power saving can be further realized.
  • a heater 24b may be provided on the adjustment unit 10 side.
  • the adjustment unit 10 and the heater 24b are thermally coupled as indicated by an arrow H2 by the heater 24b being laminated and integrated with the conversion unit 14 in the adjustment unit 10. is doing.
  • the heater 24b when viewed from the stacking direction (the direction in which the through hole extends), the heater 24b completely overlaps the region 50A. Therefore, the sensor unit 20 and the heater 24b are integrated by stacking and integrating the heater 24b with the detection portion 24a in the sensor unit 20 via the base portion 24c, the adhesive layer 26, and the region 50A. It is thermally coupled like *
  • the material of the heat-transfer material 30 is not limited to this.
  • a nonconductive material such as diamond or aluminum nitride may be used.
  • Non-conductive materials tend to have high thermal conductivity and are insulative, so there is no possibility of short circuit between the wirings of the ceramic wiring board 50 due to the installation of the heat transfer material 30.
  • the heat conductive material 30 is non-conductive, it is possible to heat both the adjustment unit 10 and the sensor unit 20 with lower power by the single heater 24b.
  • the gas sensor, the adjustment unit constituting the gas sensor, the shape of the sensor unit, and the like are not limited to the above embodiment.
  • the types of the conversion unit and the detection unit are not limited.
  • the shape, number and diameter of through holes and heat transfer materials are not limited.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Molecular Biology (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

[Problème] La présente invention aborde le problème de la mise à disposition d'un capteur de gaz, grâce auquel la précision de détection d'un composant de gaz spécifique est améliorée du fait qu'il est fourni sous forme d'un dispositif de chauffage unique, et permet d'obtenir une réduction de taille et des économies d'énergie. [Solution] Ce capteur de gaz est pourvu : d'une unité de réglage 10 qui est pourvue d'une section de conversion 14, qui est pourvue d'une première chambre C1, et qui convertit un premier composant de gaz en un second composant de gaz ; une unité de capteur 20 qui est pourvue d'une section de détection 24a, qui est pourvue d'une seconde chambre C2, et dans laquelle des caractéristiques électriques changent correspondant à la concentration du second composant de gaz ; une carte de câblage en céramique 50, sur laquelle est disposée la section de détection ; et un dispositif de chauffage 24b unique. Un trou traversant 30 est formé dans une région 50A dans laquelle la section de détection est disposée, ladite région étant une partie de la carte de câblage en céramique, le trou traversant est rempli d'un matériau de transfert de chaleur présentant une conductivité thermique élevée, et le capteur de gaz est formé en intégrant l'unité de réglage, l'unité de capteur, et le dispositif de chauffage l'un avec l'autre dans un mode dans lequel l'unité de réglage et le dispositif de chauffage sont couplés thermiquement l'un à l'autre, l'unité de capteur et le dispositif de chauffage sont couplés thermiquement l'un à l'autre, et au moins une partie du dispositif de chauffage chevauche la région lorsqu'elle est vue depuis la direction dans laquelle s'étend le trou traversant.
PCT/JP2018/003334 2017-02-21 2018-02-01 Capteur de gaz Ceased WO2018155119A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017029829A JP2018136163A (ja) 2017-02-21 2017-02-21 ガスセンサ
JP2017-029829 2017-02-21

Publications (1)

Publication Number Publication Date
WO2018155119A1 true WO2018155119A1 (fr) 2018-08-30

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PCT/JP2018/003334 Ceased WO2018155119A1 (fr) 2017-02-21 2018-02-01 Capteur de gaz

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WO (1) WO2018155119A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019235174A1 (fr) * 2018-06-06 2019-12-12 日本特殊陶業株式会社 Unité catalytique et capteur d'expiration

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10300702A (ja) * 1997-04-24 1998-11-13 Ngk Insulators Ltd 低濃度ＮＯｘ計測器
JP2005214933A (ja) * 2004-02-02 2005-08-11 Shimadzu Corp 水素センサ
WO2015134895A1 (fr) * 2014-03-07 2015-09-11 Spirometrix, Inc. Dispositif de surveillance respiratoire
WO2018008336A1 (fr) * 2016-07-08 2018-01-11 日本特殊陶業株式会社 Capteur de gaz

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10300702A (ja) * 1997-04-24 1998-11-13 Ngk Insulators Ltd 低濃度ＮＯｘ計測器
JP2005214933A (ja) * 2004-02-02 2005-08-11 Shimadzu Corp 水素センサ
WO2015134895A1 (fr) * 2014-03-07 2015-09-11 Spirometrix, Inc. Dispositif de surveillance respiratoire
WO2018008336A1 (fr) * 2016-07-08 2018-01-11 日本特殊陶業株式会社 Capteur de gaz

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019235174A1 (fr) * 2018-06-06 2019-12-12 日本特殊陶業株式会社 Unité catalytique et capteur d'expiration

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