JPH0680424B2 - Oxygen concentration detector - Google Patents
Oxygen concentration detectorInfo
- Publication number
- JPH0680424B2 JPH0680424B2 JP59279705A JP27970584A JPH0680424B2 JP H0680424 B2 JPH0680424 B2 JP H0680424B2 JP 59279705 A JP59279705 A JP 59279705A JP 27970584 A JP27970584 A JP 27970584A JP H0680424 B2 JPH0680424 B2 JP H0680424B2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen concentration
- metal fitting
- concentration detector
- detection element
- wall
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は酸素濃度検出器に係り、特に自動車エンジン排
気などの固定粒子を含むガス中の酸素濃度を検出するの
に好適な酸素濃度検出器に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen concentration detector, and more particularly to an oxygen concentration detector suitable for detecting the oxygen concentration in a gas containing fixed particles such as automobile engine exhaust. It is a thing.
従来の酸素濃度検出器として、ジルコニアなどの酸素イ
オン伝導性固体電解質を用いて酸素濃淡電池あるいは酸
素ポンプの原理を利用した方式、さらに、チタニアなど
の金属酸化物における電子伝導度の酸素濃度依存性を利
用した方式のものがあり、自動車エンジンの供給混合気
の制御のため、空燃比に対応する排気中の酸素濃度検出
に広く使用されている。As a conventional oxygen concentration detector, a method that uses the principle of an oxygen concentration battery or an oxygen pump by using an oxygen ion conductive solid electrolyte such as zirconia, and the oxygen concentration dependence of the electron conductivity in metal oxides such as titania. Is used to detect the oxygen concentration in the exhaust gas that corresponds to the air-fuel ratio because it controls the air-fuel mixture supplied to the automobile engine.
これらの酸素濃度検出器の出力信号には温度依存性があ
り、一方、検出器が装着される自動車エンジン排気管内
の温度は、−50℃から＋800℃程度まで変化し、排気の
流速は、０から100m/sec程度まで変動するので、それぞ
れの目的に応じた温度制御が必要となる。例えば、酸素
濃淡電池を用いる空燃比理論点検出には、300℃以上の
温度に制御すればよいのに対して、電子伝導度の酸素濃
度依存性を用いる空燃比理論点検出には、500℃以上の
所定範囲の温度に制御する必要があり、さらに、酸素ポ
ンプを用いる希薄域空燃比のリニア検出には、800℃程
度の定温度制御をすることが必要とされ、後の２者では
検出要素に接近して電熱要素を併置し、さらに、感熱要
素を併置したものが提案されている。この場合、エンジ
ン作動中、常時通電加熱の必要があるが、燃料消費抑制
の面から加熱電力を抑制することが要求され、加熱部分
の熱容量を小さくする必要があり、このため、検出要素
として小容量のデスク型，厚膜型，薄膜型が提案され、
検出要素を含む支持、導電のための基体は、円柱形，角
柱形，板形ともに一般に細長くなりつつある。The output signals of these oxygen concentration detectors have temperature dependence. On the other hand, the temperature inside the exhaust pipe of the automobile engine in which the detector is mounted changes from -50 ° C to + 800 ° C, and the flow velocity of the exhaust gas is 0. To 100 m / sec, it is necessary to control the temperature according to each purpose. For example, in order to detect the air-fuel ratio theoretical point using an oxygen concentration battery, the temperature may be controlled to 300 ° C or higher, whereas in detecting the air-fuel ratio theoretical point using the oxygen concentration dependence of electron conductivity, 500 ° C may be used. It is necessary to control the temperature within the above predetermined range, and further, linear detection of the lean region air-fuel ratio using an oxygen pump requires constant temperature control of about 800 ° C. It has been proposed that an electric heating element is juxtaposed close to the element, and a heat sensitive element is juxtaposed. In this case, it is necessary to always energize and heat during engine operation, but it is necessary to suppress heating power from the viewpoint of suppressing fuel consumption, and it is necessary to reduce the heat capacity of the heating portion. Capacity desk type, thick film type, thin film type are proposed,
The support, including the detection element, and the base body for conducting are generally elongated in a cylindrical shape, a prismatic shape, and a plate shape.
一方、排気中には吸入空気中のダスト、ミスト、燃料や
潤滑油の燃焼残渣物、エンジンシリンダ、ピストンや吸
排気弁の摺動摩耗粉などの固形粒子が含まれており、燃
焼室や排気管の内壁に附着堆積することが知られてい
る。これらの附着物は、炭素、マグネシウム、ケイ素、
燐、硫黄、カルシウム、クロム、鉄、亜鉛、鉛などであ
り、カルシウム以上の重いものは、800℃でも気化し難
い。したがつて、常時800℃に通電加熱したとしてもこ
れらの固形粒子が検出要素に附着し、次第に堆積して出
力信号が変化し、遂には検出不能に至ることがある。こ
のことは、検出要素が小さくなるほど著しい。On the other hand, the exhaust gas contains dust, mist in the intake air, combustion residues of fuel and lubricating oil, solid particles such as sliding wear powder of engine cylinders, pistons and intake / exhaust valves. It is known to deposit on the inner wall of the tube. These attachments are carbon, magnesium, silicon,
Phosphorus, sulfur, calcium, chromium, iron, zinc, lead, etc., which are heavier than calcium, are difficult to vaporize even at 800 ° C. Therefore, even if the electric current is constantly heated to 800 ° C., these solid particles may adhere to the detection element, gradually accumulate and the output signal changes, and eventually detection becomes impossible. This becomes more remarkable as the detection element becomes smaller.
例えば、特開昭55−124062号公報で開示されたもので
は、細長い矩形板状の基体が栓体金具内にパッキングを
介して結合支持されており、基体の一端に電極を含む検
出部と層状加熱部材があり、栓体金具内の空所に位置し
て被検ガスと接触するようになっている。For example, in the one disclosed in Japanese Patent Laid-Open No. 55-124062, an elongated rectangular plate-shaped base is coupled and supported in a plug fitting through a packing, and one end of the base has a detection part including an electrode and a layered structure. There is a heating member, which is located in the void inside the plug fitting so as to come into contact with the test gas.
しかし、この構造では、自動車エンジン排気管に装着し
た場合には、前述した固形粒子の付着による酸素濃度検
出要素の劣化が免れず、また、排気ガスの温度と流速が
大幅に、かつ、急激に変動するので検出部の温度が大き
く変動し、検出部の定温度制御が不安定になり、検出精
度の低下原因となる。However, with this structure, when attached to an automobile engine exhaust pipe, deterioration of the oxygen concentration detection element due to adhesion of solid particles described above is unavoidable, and the temperature and flow velocity of exhaust gas are drastically and rapidly increased. Since the temperature fluctuates, the temperature of the detection unit fluctuates greatly, and the constant temperature control of the detection unit becomes unstable, which causes a decrease in detection accuracy.
本発明は以上の点に鑑みてなされ、その目的は、固形粒
子を含み、温度と流速が大幅に変動する被検ガスであっ
ても長期間安定に酸素濃度を検出することができる酸素
濃度検出器を提供することにある。The present invention has been made in view of the above points, and an object thereof is to detect oxygen concentration that can stably detect oxygen concentration for a long period of time even in a test gas that includes solid particles and whose temperature and flow velocity fluctuate significantly. To provide a container.
本発明は、上記目的を達成するために、酸素濃度検出器
を基本的には次のように構成する。In order to achieve the above object, the present invention basically configures the oxygen concentration detector as follows.
すなわち、一端に酸素濃度を検出する電極を有する検出
要素及び電熱要素を備え、他端に前記電極に接続された
導電端子を備えた細長い形状の基体が被検ガス通路壁に
装着した支持金具に結合されてなる酸素濃度検出器にお
いて、前記基体の前記支持金具への結合部が前記被検ガ
ス通路壁より外側に突出した位置にあり、前記結合部の
みに向って開口された被検ガス流通口を設けてある有底
管で前記検出要素部を囲った構成としてあることを特徴
とする。That is, a slender base body provided with a detection element having an electrode for detecting oxygen concentration at one end and an electric heating element, and a conductive terminal connected to the electrode at the other end is used as a support metal fitting attached to the wall of the gas passage under test. In the combined oxygen concentration detector, the connecting portion of the base body to the support fitting is located at a position projecting outward from the detecting gas passage wall, and the measuring gas flow is opened toward only the connecting portion. It is characterized in that the detection element portion is surrounded by a bottomed tube provided with a mouth.
以下、本発明の第１図〜第４図に示した実施例を用いて
詳細に説明する。Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 4.
第１図は本発明の酸素濃度検出器の一実施例を示す縦断
面図、第２図は第１図の要部側方縦断面図、第３図は第
１図のＡ−Ａ線断面図、第４図は第１図のＢ−Ｂ線断面
図である。FIG. 1 is a longitudinal sectional view showing an embodiment of the oxygen concentration detector of the present invention, FIG. 2 is a lateral longitudinal sectional view of an essential part of FIG. 1, and FIG. 3 is a sectional view taken along the line AA of FIG. FIG. 4 and FIG. 4 are sectional views taken along line BB in FIG.
第１図において、１は部分安定化ジルコニア固体電解質
よりなる基体で、幅広部を有する細長い矩形板状をなし
ており、下端部に図示してない電熱要素を内蔵した酸素
濃度を検出する検出要素1aを有する。検出要素1aは、例
えば、特開昭59−108951号公報に示してあるものであ
る。基体１の上端幅広部には、検出要素1aの電極に接続
してある導電端子1bがあり、この端子1bに内部リード線
２が接続してある。３は六角対辺を有し（第３図参
照）、下端外周にねじ3aを施した円筒状の栓体金具（栓
体金具は基体１を支持する支持金具となる）であり、そ
の軸方向の中間位置に設けた内径段付部に長溝孔を有す
る円板状の金具（パッキング）４を加締めまたは溶接に
よつて取り付けてある。５はステンレス鋼板よりなるつ
ばを有する皿状金具で、底面に４〜８個の小円孔5aを、
外周に８〜16個の大円孔5bが開けてあり、その内底面に
有底管となる有底楕円筒６（第３図参照）が溶接などに
より組みつけてある。皿状金具５は、栓体金具３の下端
3bに全周加締めにより組みつけてある。酸素濃度検出器
を組み立てる場合には、まず、皿状金具５を上記のよう
に加締めにより栓体金具３の下端3bに取付ける。このと
き、有底楕円筒６の開口は円板状金具４側に間をおいて
向けてある。この状態で基体１を金具４を通して挿通し
て、基体１の検出素子1a側を有底管６内部に挿入する。
次いで、液状の無機質充填剤７を注入し、さらに、アル
ミナまたはステアタイト製の端子ホルダー８とリード線
ホルダー９とを挿入し、無機質充填剤７を所定の乾燥条
件で固化する。次に、リード線２の他端に接続子10を介
してフツ素レジン系絶縁被覆撚線のハーネス11を挿入
し、シリコン系ラバーの円柱状クツシヨン12を挿入し、
最後に展延性の薄肉円筒状の外筒金具13を外挿し、その
拡管部13aのつば部を栓体金具３の円周溝3cに加締めて
固定し、引続き外筒金具13の部分13b,13cをリンク状に
加締め、検出器本体を構成している。In FIG. 1, reference numeral 1 is a base made of a partially stabilized zirconia solid electrolyte, which is in the form of an elongated rectangular plate having a wide portion, and has an electrothermal element (not shown) at the lower end portion for detecting an oxygen concentration. Having 1a. The detection element 1a is shown in, for example, Japanese Patent Laid-Open No. 59-108951. A conductive terminal 1b connected to the electrode of the detection element 1a is provided in the wide upper portion of the base 1, and the internal lead wire 2 is connected to this terminal 1b. 3 is a cylindrical plug metal fitting (see FIG. 3) having a hexagonal opposite side, and a screw 3a on the outer periphery of the lower end (the plug metal fitting serves as a support metal fitting for supporting the base body 1). A disc-shaped metal fitting (packing) 4 having a long groove hole is attached to the inner diameter stepped portion provided at the intermediate position by caulking or welding. 5 is a plate-shaped metal fitting having a collar made of a stainless steel plate, 4 to 8 small circular holes 5a on the bottom surface,
Eight to 16 large circular holes 5b are formed on the outer circumference, and an elliptic cylinder 6 with a bottom (see FIG. 3) serving as a bottomed tube is attached to the inner bottom surface by welding or the like. The plate-shaped metal fitting 5 is the lower end of the plug metal fitting 3.
It is assembled on 3b by caulking all around. When assembling the oxygen concentration detector, first, the dish-shaped metal fitting 5 is attached to the lower end 3b of the stopper metal fitting 3 by caulking as described above. At this time, the opening of the bottomed elliptic cylinder 6 is directed toward the disc-shaped metal fitting 4 side with a gap. In this state, the base 1 is inserted through the metal fitting 4, and the detection element 1a side of the base 1 is inserted into the bottomed tube 6.
Then, the liquid inorganic filler 7 is injected, and further, the terminal holder 8 and the lead wire holder 9 made of alumina or steatite are inserted, and the inorganic filler 7 is solidified under a predetermined drying condition. Next, a harness 11 made of fluorine resin insulation coated stranded wire is inserted into the other end of the lead wire 2 through a connector 10, and a cylindrical rubber cushion 12 of silicon rubber is inserted.
Finally, the malleable thin-walled cylindrical outer tubular metal fitting 13 is externally inserted, and the flange portion of the expanded pipe portion 13a is caulked and fixed to the circumferential groove 3c of the stopper metal fitting 3, and the portion 13b of the outer tubular metal fitting 13 is continued. The detector body is constructed by crimping 13c in a link shape.
一方、排気管14の外壁に突き出してめネジを施したボス
金具15を溶着し、ガスケツトリング16を介して検出器本
体をネジ込み装着する。On the other hand, the boss metal fitting 15 protruding from the outer wall of the exhaust pipe 14 and having an internal thread is welded, and the detector main body is screwed and mounted via the gasket ring 16.
以上により、基体１は排気管14の内壁より外側へ突出し
た位置で栓体金具３に無機質充填剤７及び円板状金具４
を介して支持結合される。すなわち、この円板状金具４
のある位置が栓体金具３における基体１の結合部に相当
する。基体１の検出要素1a側は、その周囲を有底楕円筒
６及び皿状金具５に二重に囲まれ、有底楕円筒６は上記
結合部のみに向かつて開口され、この開口部が有底楕円
筒６の被検ガス流通口となる。検出要素1aは、排気管14
の壁面近傍に位置することになる。As described above, the base body 1 is provided in the plug metal fitting 3 at the position projecting outward from the inner wall of the exhaust pipe 14, the inorganic filler 7 and the disk-shaped metal fitting 4
Is supported and coupled via. That is, this disc-shaped metal fitting 4
The position where is present corresponds to the connecting portion of the base 1 in the plug fitting 3. The detection element 1a side of the base 1 is doubly surrounded by the bottomed elliptic cylinder 6 and the dish-shaped metal fitting 5, and the bottomed elliptic cylinder 6 is opened only toward the above-mentioned connecting portion, and this opening is provided. It serves as the test gas flow port of the bottom elliptic cylinder 6. The detection element 1a includes an exhaust pipe 14
It will be located near the wall surface of.
排気流は、第２図と第３図中に破線矢印で示すように、
皿状金具５の周縁開口５b1側より流入し、その主流は、
有底楕円筒６の外周を廻って反対側の開口５b2側に流出
するが、一部は上下２方向に分れ、一方は底面開口５a1
側より流出し、他方は空所6aに至り、その大部分が反対
側の開口５b2,5a2側より流出するので、検出要素1a近傍
のガス交換（このガス交換は有底楕円筒６の開口の上方
に設けた空所6aを排気ガスが通過するときに生じる有底
楕円筒６内部と空所6a間の静圧差やガス拡散等によりな
される）は極めて穏やかになされる。The exhaust flow, as shown by the dashed arrows in FIGS. 2 and 3,
It flows in from the side of the peripheral opening 5b 1 of the dish-shaped metal fitting 5, and its main flow is
The outer periphery of the bottomed elliptic cylinder 6 traveling around to flow to the opening 5b 2 side opposite but some divided into upper and lower directions, one bottom opening 5a 1
Since the gas flows out from the side, the other reaches the void 6a, and most of it flows out from the opposite side openings 5b 2 and 5a 2 side, the gas exchange in the vicinity of the detection element 1a (this gas exchange occurs in the bottomed elliptic cylinder 6). The exhaust gas passes through the space 6a provided above the opening, which is caused by the static pressure difference between the inside of the bottomed elliptic cylinder 6 and the space 6a, gas diffusion, etc.) is made extremely gentle.
したがつて、第１図に示す検出器では、排気流速の大
幅、かつ、急激な変動に対して有効に作用する。第１
に、排気流の取り込みが排気管14の中心部になく、壁面
近くにあるため、穏やかな変動状態にあり、第２に、有
底楕円筒６の外壁によつてさらに緩和され、第３に、空
所6aによつて一層緩和される。Therefore, the detector shown in FIG. 1 effectively acts on a large and abrupt change in the exhaust gas flow velocity. First
In addition, since the intake of the exhaust flow is not in the center of the exhaust pipe 14 but near the wall surface, it is in a gentle fluctuation state. Secondly, it is further alleviated by the outer wall of the bottomed elliptic cylinder 6, and thirdly. , The vacant space 6a makes it easier.
また、本検出器では、検出要素1aの定温度制御性が飛躍
的に向上する。第１に、細長板状の基体１の支持部が排
気管14の内壁より外側にあるため、排気温度よりも外気
温度により強く支配される。第２に、検出要素部の排気
流速が極めて穏やかであるため、排気との熱交換が微少
であつて、内蔵電熱要素によつて強く支配される。Further, in this detector, the constant temperature controllability of the detection element 1a is dramatically improved. First, since the supporting portion of the elongated plate-shaped substrate 1 is located outside the inner wall of the exhaust pipe 14, it is strongly controlled by the outside air temperature rather than the exhaust temperature. Secondly, since the exhaust gas flow velocity of the detection element portion is extremely gentle, the heat exchange with the exhaust gas is minute and is strongly dominated by the built-in electrothermal element.
さらにまた、排気ガス中の固定粒子に対しても長期間安
定に作動する。すなわち、第１に、固形粒子の重いもの
は、流速の速い排気管中心部を流れるため、排気管内壁
から排気流を取り込むことによつて軽い固形粒子のみが
取り込まれる。第２に、これらの固形粒子は、有底楕円
筒６の外壁に捕集され、空所6aには極く軽い固形粒子の
みが極く微量漂うことになる。第３に、極く微量の軽い
固形粒子が検出要素1aに附着しようとしても、あらかじ
め800℃に赤熱されているため、すべて燃焼気化される
ので附着堆積することはない。Furthermore, it works stably for a long period even with respect to fixed particles in the exhaust gas. That is, first, heavy solid particles flow in the central portion of the exhaust pipe with a high flow velocity, and therefore only light solid particles are taken in by capturing the exhaust flow from the inner wall of the exhaust pipe. Secondly, these solid particles are collected on the outer wall of the bottomed elliptic cylinder 6, and only a very small amount of solid particles drifts in the void 6a. Thirdly, even if a very small amount of light solid particles try to attach to the detection element 1a, since they have been red-heated to 800 ° C. in advance, they are all burned and vaporized, so that they do not deposit and deposit.
また、以上の実施例では、電熱要素を内蔵する細長矩形
板状のジルコニアよりなる基体１を用いたものについて
説明したが、基体１と検出要素1a、電熱要素が別体のも
のであつてもよく、基体１の形状が板状以外の円柱状，
円筒状，角柱状，袋管状であつてもよく、同様の効果が
得られる。要は細長形の基体１の一端に検出要素と電熱
要素とを備えるものにおいて、基体の主要部分が排気管
14の壁面より外側の大気中に位置し、結合支持部側より
検出要素部側に被検ガスを緩やかに流すように部材配置
を行うようにすればよい。Further, in the above-mentioned embodiments, the description has been made of the case where the base 1 made of zirconia in the shape of an elongated rectangular plate containing the electrothermal element is used, but the base 1, the detection element 1a and the electrothermal element may be separate bodies. Often, the base body 1 has a cylindrical shape other than a plate shape,
It may have a cylindrical shape, a prismatic shape, or a tubular shape, and similar effects can be obtained. In short, in the one in which the detection element and the electric heating element are provided at one end of the elongated base body 1, the main portion of the base body is the exhaust pipe.
The members may be arranged in the atmosphere outside the wall surface of 14 and the members may be arranged so as to gently flow the test gas from the coupling support portion side to the detection element portion side.
以上説明したように、本発明によれば、固形粒子を含
み、温度，流速が大幅に、かつ、急激に変動する被検ガ
ス中においても、固定粒子の附着堆積がなく、被検ガス
の温度、流速変動の影響を受けないので、長期間安定し
た検出機能を発揮できるという効果がある。As described above, according to the present invention, even in a test gas that contains solid particles and whose temperature and flow velocity fluctuate significantly and drastically, there is no deposition of fixed particles and the temperature of the test gas is high. Since it is not affected by the fluctuation of the flow velocity, it has an effect of exhibiting a stable detection function for a long period of time.
第１図は本発明の酸素濃度検出器の一実施例を示す縦断
面図、第２図は第１図の要部側方縦断面部、第３図は第
１図のＡ−Ａ線断面図、第４図は第１図のＢ−Ｂ線断面
図である。 １…基体、1a…検出要素、３…栓体金具、４…金具、５
…皿状金具、5a…小円孔、5b…大円孔、６…有底楕円
筒、７…無機質充填剤。FIG. 1 is a longitudinal sectional view showing an embodiment of the oxygen concentration detector of the present invention, FIG. 2 is a lateral longitudinal sectional view of a main part of FIG. 1, and FIG. 3 is a sectional view taken along the line AA of FIG. 4 is a sectional view taken along line BB in FIG. 1 ... Base, 1a ... Detecting element, 3 ... Plug fitting, 4 ... Fitting, 5
... Plate-shaped metal fittings, 5a ... Small circular holes, 5b ... Large circular holes, 6 ... Elliptic cylinder with a bottom, 7 ... Inorganic filler.
Claims (2)
出要素及び電熱要素を備え、他端に前記電極に接続され
た導電端子を備えた細長い形状の基体が被検ガス通路壁
に装着した支持金具に結合されてなる酸素濃度検出器に
おいて、前記基体の前記支持金具への結合部が前記被検
ガス通路壁より外側に突出した位置にあり、前記結合部
のみに向って開口された被検ガス流通口を設けてある有
底管で前記検出要素部を囲った構成としてあることを特
徴とする酸素濃度検出器。1. An elongated substrate having a detection element having an electrode for detecting oxygen concentration and an electrothermal element at one end, and a conductive terminal connected to the electrode at the other end is attached to a wall of a gas passage to be detected. In an oxygen concentration detector connected to a support fitting, a connecting portion of the base body to the support fitting is located at a position projecting outward from the gas passage wall to be detected, and an opening is opened only toward the connecting portion. An oxygen concentration detector characterized in that the detection element portion is surrounded by a bottomed tube provided with a test gas flow port.
被検ガス通路壁側の端部に取り付けた皿状金具によって
支持され、この皿状金具の少なくとも側壁にガス流通口
が配設してある特許請求の範囲第１項記載の酸素濃度検
出器。2. The bottomed tube is supported by a dish-shaped metal fitting attached to an end of the support metal fitting on the wall side of the gas passage to be tested, and a gas flow port is provided on at least a side wall of the dish-shaped metal fitting. The oxygen concentration detector according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59279705A JPH0680424B2 (en) | 1984-12-29 | 1984-12-29 | Oxygen concentration detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59279705A JPH0680424B2 (en) | 1984-12-29 | 1984-12-29 | Oxygen concentration detector |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6071855A Division JPH0792450B2 (en) | 1994-04-11 | 1994-04-11 | Oxygen concentration detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61159150A JPS61159150A (en) | 1986-07-18 |
| JPH0680424B2 true JPH0680424B2 (en) | 1994-10-12 |
Family
ID=17614726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59279705A Expired - Lifetime JPH0680424B2 (en) | 1984-12-29 | 1984-12-29 | Oxygen concentration detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0680424B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH079077Y2 (en) * | 1988-01-29 | 1995-03-06 | 日本碍子株式会社 | Oxygen sensor |
| JP4105570B2 (en) * | 2003-03-17 | 2008-06-25 | 株式会社日立製作所 | Oxygen sensor |
| JP5969423B2 (en) | 2013-04-15 | 2016-08-17 | 日本特殊陶業株式会社 | Gas sensor |
-
1984
- 1984-12-29 JP JP59279705A patent/JPH0680424B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61159150A (en) | 1986-07-18 |
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| EXPY | Cancellation because of completion of term |