JPH0244206Y2 - - Google Patents
Info
- Publication number
- JPH0244206Y2 JPH0244206Y2 JP1982173242U JP17324282U JPH0244206Y2 JP H0244206 Y2 JPH0244206 Y2 JP H0244206Y2 JP 1982173242 U JP1982173242 U JP 1982173242U JP 17324282 U JP17324282 U JP 17324282U JP H0244206 Y2 JPH0244206 Y2 JP H0244206Y2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- sensing element
- plug
- oxygen sensing
- oxygen
- 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
Links
- 239000001301 oxygen Substances 0.000 claims description 65
- 229910052760 oxygen Inorganic materials 0.000 claims description 65
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 61
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 10
- 239000007784 solid electrolyte Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 14
- 239000012212 insulator Substances 0.000 description 9
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical group O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 239000000446 fuel Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000005489 elastic deformation Effects 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 150000002926 oxygen Chemical class 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- PYVHTIWHNXTVPF-UHFFFAOYSA-N F.F.F.F.C=C Chemical compound F.F.F.F.C=C PYVHTIWHNXTVPF-UHFFFAOYSA-N 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
本考案は、排気ガス中の残留酸素濃度を検出す
るために用いられる酸素濃度検出器の構造に関す
るものであり、特に、内部に加熱用ヒータを内蔵
した加熱用ヒータ付酸素濃度検出器の構造に係
る。
The present invention relates to the structure of an oxygen concentration detector used to detect the residual oxygen concentration in exhaust gas, and in particular to the structure of an oxygen concentration detector with a built-in heater. Related.
エンジンの空燃比調整装置や排気ガス浄化装置
をフイードバツク方式によつて制御するため、従
来より排気ガス中の残留酸素の有無を検出可能な
酸素濃度検出器が用いられている。
従来の酸素濃度検出器の基本的な構造は、一端
が閉塞した固体電解質管状体の内外面に電極を形
成して酸素検知素子を構成し、その内面を静浄な
大気に、外面を排気ガスにそれぞれ曝し、これら
両電極間に生ずる電圧を検出することにより排気
ガス中の酸素濃度を検出するようになつている。
ところで、酸素濃度検出器は酸素検知素子の温
度を活性化温度以上（例えば、固体電解質の主成
分がジルコニアであれば約400℃以上）に保たな
ければ酸素濃度検出器としての機能を果たさな
い。特に始動直後やアイドリング時には排気ガス
温度が低く、また低燃費化を狙つた近年のエンジ
ンにおいても全般的に排気ガスの温度が低くなる
ことがあり、このような条件下においても確実に
活性化させる必要があつた。
そこで従来より、始動時やアイドリング時にお
いて酸素濃度検出器の機能を確実に発揮させるた
めに、酸素検知素子の内部に形成される内腔に加
熱用ヒータを配設して酸素検知素子を加熱する所
謂加熱用ヒータ付酸素濃度検出器が利用されてい
る（例えば、特開昭50−010692号公報）。
上記従来の加熱用ヒータ付酸素濃度検出器は、
排気管に取付けられるハウジング内に収装され、
その内面および外面に電極を設けた酸素イオン伝
導性セラミツクスからなるコツプ状の隔壁（固体
電解質管状体）の内部に絶縁碍子管をねじ込み、
またこの絶縁碍子管の内部にグロープラグ（加熱
用ヒータ）をねじ込み固定することにより酸素検
知素子を加熱し、所望の活性化温度に保たれるよ
うに構成されている。
従つて、始動時やアイドリング時または低燃費
化を狙つたため排気ガス温度が低下するようなエ
ンジンにおいても確実に酸素濃度を検出すること
ができ、空燃比の安定化および排気ガス浄化性能
の向上をはかることができる。
BACKGROUND ART In order to control an engine's air-fuel ratio adjustment device and exhaust gas purification device using a feedback method, an oxygen concentration detector capable of detecting the presence or absence of residual oxygen in exhaust gas has conventionally been used. The basic structure of a conventional oxygen concentration detector is to form an oxygen sensing element by forming electrodes on the inner and outer surfaces of a solid electrolyte tubular body with one end closed.The inner surface is exposed to clean air and the outer surface is exposed to exhaust gas. The oxygen concentration in the exhaust gas is detected by exposing the exhaust gas to each electrode and detecting the voltage generated between these two electrodes. By the way, an oxygen concentration detector cannot function as an oxygen concentration detector unless the temperature of the oxygen sensing element is kept above the activation temperature (for example, about 400°C or higher if the main component of the solid electrolyte is zirconia). . The exhaust gas temperature is particularly low immediately after startup or when idling, and even in recent engines that aim to improve fuel efficiency, the exhaust gas temperature can be generally low, so even under such conditions, it is necessary to activate the The need arose. Conventionally, in order to ensure that the oxygen concentration detector functions properly during startup and idling, a heater is installed in the internal cavity of the oxygen sensing element to heat the oxygen sensing element. A so-called oxygen concentration detector with a heating heater is used (for example, Japanese Patent Laid-Open No. 50-010692). The above conventional oxygen concentration detector with heater is
It is housed in a housing that is attached to the exhaust pipe,
An insulator tube is screwed into the inside of a pot-shaped partition wall (solid electrolyte tubular body) made of oxygen ion conductive ceramics with electrodes on its inner and outer surfaces.
Further, by screwing and fixing a glow plug (heater) inside this insulator tube, the oxygen sensing element is heated and maintained at a desired activation temperature. Therefore, the oxygen concentration can be reliably detected even in engines where the exhaust gas temperature drops during startup, idling, or to improve fuel efficiency, stabilizing the air-fuel ratio and improving exhaust gas purification performance. can be measured.
しかしながら、従来の加熱用ヒータ付酸素濃度
検出器においては、隔壁（固体電解質管状体）、
絶縁碍子管および加熱用ヒータのそれぞれをねじ
込み固定する構成となつていたため、隔壁の内
面、絶縁碍子管の内外面および加熱用ヒータにね
じ部を加工する必要があつた。
この場合、硬度が高く脆い碍子管や隔壁にねじ
部を形成しなければならないために、加工部に割
れが生じないように注意をはらう必要があり、高
い加工精度が要求されるとともに、組付けの際に
それぞれの部品をねじ込み固定しなければなら
ず、組付け性の悪化をも招くものであつた。
従つて、本考案は加工精度が要求される部品に
ねじ部を形成することなく各部品を組付け固定可
能とすることにより、酸素濃度検出器製造におけ
る生産性、組付け性の向上をはかることを目的と
する。
However, in the conventional oxygen concentration detector with a heater, the partition wall (solid electrolyte tubular body),
Since the insulator tube and the heater were each screwed and fixed, it was necessary to machine threads on the inner surface of the partition wall, the inner and outer surfaces of the insulator tube, and the heater. In this case, since threads must be formed on the hard and brittle insulator tubes and bulkheads, care must be taken to prevent cracks from occurring in the machined parts, requiring high processing accuracy, and assembly. At the time of installation, each part had to be screwed and fixed, which also resulted in poor assembly performance. Therefore, the present invention aims to improve productivity and ease of assembly in the manufacture of oxygen concentration detectors by making it possible to assemble and fix each part without forming threads on parts that require high processing accuracy. With the goal.
そこで本考案は、上記の課題を解決するため
に、一端が閉塞した固体電解質管状体の内面に内
側電極、外面に外側電極を設けた酸素検知素子
と、酸素検知素子の開口端内周に設けられた栓状
スリーブと、栓状スリーブに嵌合され酸素検知素
子の内腔に挿入された加熱用ヒータとからなる酸
素検知素子部を備えた加熱用ヒータ付酸素濃度検
出器において、上記栓状スリーブは、上面にバネ
受け面が形成された大径部、大径部の下方におい
て酸素検知素子内周面に接触するテーパ部、中央
を貫通し、ヒータを挿入把持可能な貫通孔および
酸素検知素子の軸方向にわたつて形成され、スリ
ーブ上部の内腔とスリーブ下部の内腔とを連通す
る連通路を備えており、この連通路は少なくとも
テーパ部からスリーブ下端に至る範囲において貫
通孔と周面とを連通するスリツト部を形成してお
り、栓状スリーブが酸素検知素子内部に収装さ
れ、コイルバネによつて押圧された際にスリツト
によつてテーパ部が半径方向に弾性変形可能に形
成されることを特徴とする。
Therefore, in order to solve the above-mentioned problems, the present invention has developed an oxygen sensing element in which an inner electrode is provided on the inner surface of a solid electrolyte tubular body with one end closed, and an outer electrode is provided on the outer surface, and an oxygen sensing element is provided on the inner periphery of the open end of the oxygen sensing element. In the oxygen concentration detector with a heater for heating, the oxygen concentration detector includes a plug-like sleeve and a heater fitted into the plug-like sleeve and inserted into the inner cavity of the oxygen sensing element. The sleeve has a large diameter part with a spring receiving surface formed on the upper surface, a tapered part below the large diameter part that contacts the inner circumferential surface of the oxygen sensing element, a through hole that penetrates through the center into which a heater can be inserted and gripped, and an oxygen sensing element. A communication passage is formed in the axial direction of the element and communicates the inner cavity of the upper part of the sleeve with the inner cavity of the lower part of the sleeve. A plug-shaped sleeve is housed inside the oxygen sensing element, and the slit allows the tapered part to be elastically deformed in the radial direction when pressed by a coil spring. It is characterized by being
本考案の加熱用ヒータ付酸素濃度検出器によれ
ば、少なくともテーパ部より下端部分にスリツト
を形成する連通路を備えた栓状スリーブを酸素検
知素子の開口端内周に挿入し、かつコイルバネに
よつて押圧することにより、栓状スリーブ内部に
挿入された加熱用ヒータをテーパ部の弾性変形に
よつて把持固定することができる。
According to the oxygen concentration detector with a heater of the present invention, a plug-like sleeve having a communicating passage forming a slit at least in the lower end portion than the tapered portion is inserted into the inner periphery of the open end of the oxygen sensing element, and the sleeve is connected to the coil spring. By pressing, the heater inserted into the plug-like sleeve can be gripped and fixed by the elastic deformation of the tapered portion.
以下、本考案の一実施例を図面に基づいて説明
する。
第１図および第２図は本考案の一実施例の要部
を示す説明図であり、第１図は加熱用ヒータ付酸
素濃度検出器の縦断面図、第２図は栓状スリーブ
の斜視図である。
第１図において、１は酸素検知素子であり、イ
ツトリア（Y2O3）で安定化させたジルコニア
（ZrO2）からなる固体電解質の一端が閉塞した管
状体１１の内外面に白金の薄膜を焼付けて形成し
てあり、その内面は内側電極１２を、外面は外側
電極１３を形成する。この酸素検知素子１と後述
する管体５とはハウジング２でかしめ結合されて
おり、ハウジング２はフランジ３に固着されてい
る。
このフランジ３を図示しないエンジンの排気管
にボルト締めすることにより、酸素濃度検出器が
取付けられるとともに、外側電極１３がアースさ
れる。なお、図示を省略してあるが、外側電極１
３を保護するため、その表面を覆つてアルミナス
ピネルからなる容射層が形成されている。４は多
数穿設された小孔を介して外側電極１３が排気ガ
スに露呈させるとともに、機械的な破損から保護
するためのカバーである。
管体５はその一端が酸素検知素子１の開口端外
周に嵌着され、シール部材６を介在させてハウジ
ング２で酸素検知素子１に気密的に結合されてい
る。また管体５はテーパ部５１を経てその他端の
内径を縮小してあり、この縮小部５２において電
気絶縁性の弾性材からる筒状のパツキング７およ
びこのパツキング７の貫通孔に挿通された後述の
碍管２４とリード線２５１とを気密的に緊縛して
いる。
８は管体５の内面に嵌着したフイルタであり、
四弗化エチレンを気体率50％の連続気泡材の筒状
に成形したもので、空気は流通自在であるが、撥
水性のために水を弾き、かつ空気中の埃を捕捉す
る。９はフイルタ８を所定の位置に保持するホル
ダである。
このフイルタ８を隔てて対峙する位置において
管体５には孔５３を、ホルダ９には孔９１がそれ
ぞれ穿設されている。このようにして一方がシー
ル部材６で、他方はパツキング７で区画された管
体５の内腔５４が、孔５３−フイルタ８−孔９１
からなる連通孔装置を通じてのみ大気に露呈され
ることになる。
１６はアルミナからなる碍子で、管体５のテー
パ部５１で位置決めされて後述する接続管２５お
よびホルダ９とを支承している。
酸素検知装置１の開口端内周１４には、導電性
材料からなる栓状スリーブ１０が挿入されてお
り、碍子１６との間に介装された圧縮コイルバネ
１７によつて下方に押圧されている。
栓状スリーブ１０は第２図に示されるように、
開口端内周１４の形状、寸法に対応させて大径部
１０１、この下方に位置するテーパ部１０３およ
び小径部１０２とからなり、本実施例の場合、大
径部１０１、テーパ部１０３の周面が酸素検知素
子１の内周面（内側電極１２）に接続するように
構成されており、また大径部１０１の上面は圧縮
コイルバネ１７のバネ受け面を形成している。
栓状スリーブ１０の中央部には軸方向の全長に
わたつて加熱用ヒータ２３を挿入把持可能な貫通
孔１０４が穿設されている。
さらに栓状スリーブ１０にはスリーブ上部の内
腔５４とスリーブ下部の内腔１５とを連通するた
めに軸方向にわたつて第１のスリワリ１０５と第
２のスリワリ１０６が形成されており、これらの
スリワリによつて内腔１５内に大気を導入するた
めの連通路が形成される。
本実施例の場合、第１のスリワリ１０５は大径
部１０１の上端からテーパ部１０３および小径部
１０２下端に至る全域において貫通孔１０４と各
部の周面とを連通すべくスリツト状に形成されて
おり、また第２のスリワリ１０６は第１図のハツ
チングにて示されるように大径部１０１からテー
パ部１０３の途中までは余肉１０７を残し、テー
パ部１０３の途中から小径部１０２下端に至る範
囲において貫通孔１０４と周面とを連通するスリ
ツトが形成されている。
このように連通路によつてテーパ部１０３の途
中から下方（本実施例の場合は小径部１０２の下
端部）に至るスリツトを形成すれば、スリツトを
設けた部分、即ち、少なくともテーパ部１０３の
途中から栓状スリーブ１０の下端に至る部分を半
径方向に弾性変形可能に形成することができる。
一方、加熱用ヒータ２３は本実施例の場合、中
実棒状のセラミツク体の中に薄膜の金属発熱体を
埋設した構造のセラミツクヒータが用いられてお
り、このヒータ２３はアルミナからなる碍管２４
に挿通してある給電線２３１によつて図示しない
外部の電源に接続されている。
なお、加熱用ヒータ２３と栓状スリーブ１０と
は大径部１０１の上面の一部分（例えば余肉１０
７）においてロウ付け等により固着しておいても
よい。
以上述べた酸素検知素子１と栓状スリーブ１０
および加熱用ヒータ２３によつて酸素検知素子部
１００が形成され、これらによつて酸素濃度検出
器の主体部が構成される。
２５は導電性材料からなる接続管で、管体５の
軸心と略一致して延び、その内腔に碍管２４が挿
通されているとともに、この接続管の一端に形成
されたフランジが管体５の内腔５４を隔てて栓状
スリーブ１０と対峙して圧縮コイルバネ１７のバ
ネ受け面を形成する。また接続管２５の他端は図
示しない外部の電圧検出器に至るリード線２５１
に接続されている。
上記の構成における本実施例の作用を説明す
る。
酸素濃度検出器を組付ける際において酸素検知
素子１の開口端内周１４に加熱用ヒータ２３を挿
入把持可能な貫通孔１０４が穿設され、また内腔
１５に大気を導入可能な連通路１０５，１０６を
形成した栓状スリーブ１０を挿入し、この栓状ス
リーブ１０を接続管２５下端のフランジと栓状ス
リーブ１０の大径部１０１の上面との間に挿入し
た圧縮コイルバネ１７によつて押圧する。
このように構成することにより、圧縮コイルバ
ネ１７のバネ力で栓状スリーブ１０と碍子１６と
がそれぞれの位置に圧接され、リード線２５１−
接続管２５−圧縮コイルバネ１７−栓状スリーブ
１０が内側電極１２に電気的に接続されることに
なり、通電することによりアースされた外側電極
１３との間に電位差が生じ、排気ガス中の酸素濃
度を検出することができる。
そして本実施例の場合、内腔１５内に大気を導
入するために形成された連通路としての第１スリ
ワリ１０５および第２のスリワリ１０６が少なく
ともテーパ部１０３から小径部１０２の下端に至
る範囲において貫通孔１０４とテーパ部１０３お
よび小径部１０２の周面とを連通するスリツト状
に形成されているため、テーパ部１０３が圧縮コ
イルバネ１７によつて開口端内周１４に押圧され
た際にバネ力とテーパ部１０３の楔作用によつて
栓状スリーブ１０自体にコレツトチヤツクと同じ
ように半径方向に弾性変形が生じ貫通孔１０４に
挿入された加熱用ヒータ２３が狭窄把持され、加
熱用ヒータ２３を確実に固定できて内側電極１２
との接触を防止することができる。
従つて、本実施例の栓状スリーブ１０の構造に
よれば、開口端内周１４や栓状スリーブ１０さら
には加熱用ヒータ２３のそれぞれにねじ部を加工
して固定締結する必要がなく、ねじ部加工に伴う
加工工数の増大を招くこともなく、また高い加工
精度が要求されたり、組付け性の悪化を招くこと
も回避できる。
さらに、本実施例のように栓状スリーブ１０自
体に大気導入のための連通路１０５，１０６を形
成することにより、加熱用ヒータ２３や酸素検知
素子１（管状体１１）に連通路を形成する必要が
なく、連通路の数を多くしたり、また比較的連通
路径を大きくする等設計自由度を高めることがで
き、異物混入に伴う連通路の目詰まり等の不具合
を抑制することができる。
従つて、内側電極１２を常に大気と等しい酸素
分圧の雰囲気のもとに置くことができ、排気ガス
中の酸素分圧を常に正確に検出することができ
る。
次に本考案の第２実施例について以下説明す
る。
第３図は本考案の第２実施例に係る加熱用ヒー
タ付酸素濃度検出器に用いられる栓状スリーブの
斜視図を示す。
本考案によれば、栓状スリーブ３１に形成され
たスリワリ３１６が貫通孔１０４側に形成され、
その下端がテーパ部の途中から小径部１０２下端
に至る範囲において貫通孔１０４と周面とを連通
すべくスリツト状に形成されている点が第１実施
例と相違しているのみで、その他の構成について
は第１実施例と同様である。
以上、本考案の特定の実施例について説明した
が、本考案はこれら実施例に限定されるものでは
なく、実用新案登録請求の範囲に記載の範囲内で
種々の実施態様が包含されるものである。
Hereinafter, one embodiment of the present invention will be described based on the drawings. FIGS. 1 and 2 are explanatory diagrams showing essential parts of an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of an oxygen concentration detector with a heater, and FIG. 2 is a perspective view of a plug-shaped sleeve. It is a diagram. In FIG. 1, reference numeral 1 denotes an oxygen sensing element, which has platinum on the inner and outer surfaces of a tubular body 11, which is closed at one end with a solid electrolyte made of zirconia ( ZrO2 ) stabilized with yttoria ( Y2O3 ) . It is formed by baking a thin film, and its inner surface forms an inner electrode 12 and its outer surface forms an outer electrode 13. This oxygen sensing element 1 and a tube body 5, which will be described later, are caulked together through a housing 2, and the housing 2 is fixed to a flange 3. By bolting this flange 3 to an exhaust pipe of an engine (not shown), an oxygen concentration detector is attached and the outer electrode 13 is grounded. Although not shown, the outer electrode 1
3, a reflective layer made of alumina spinel is formed over its surface. A cover 4 exposes the outer electrode 13 to exhaust gas through a large number of small holes and protects it from mechanical damage. One end of the tubular body 5 is fitted onto the outer periphery of the open end of the oxygen sensing element 1, and the housing 2 is hermetically coupled to the oxygen sensing element 1 with a sealing member 6 interposed therebetween. The inner diameter of the other end of the tubular body 5 is reduced through a tapered portion 51, and at this reduced portion 52, a cylindrical packing 7 made of an electrically insulating elastic material is inserted into a through hole of this packing 7, which will be described later. The insulator tube 24 and the lead wire 251 are tightly tied together in an airtight manner. 8 is a filter fitted on the inner surface of the tube body 5;
It is made of ethylene tetrafluoride molded into a cylindrical shape made of open-cell material with a gas content of 50%, allowing air to flow freely, but its water repellency repels water and traps dust in the air. A holder 9 holds the filter 8 in a predetermined position. A hole 53 is formed in the tube body 5 and a hole 91 is formed in the holder 9 at positions facing each other with the filter 8 in between. In this way, the inner cavity 54 of the tube body 5, which is partitioned by the sealing member 6 on one side and the packing 7 on the other side, is divided into the hole 53, the filter 8, and the hole 91.
It will be exposed to the atmosphere only through the communicating hole system consisting of. Reference numeral 16 denotes an insulator made of alumina, which is positioned at the tapered portion 51 of the tube body 5 and supports a connecting tube 25 and a holder 9, which will be described later. A plug-shaped sleeve 10 made of a conductive material is inserted into the inner periphery 14 of the open end of the oxygen detection device 1, and is pressed downward by a compression coil spring 17 interposed between the sleeve 10 and the insulator 16. . The plug-like sleeve 10 is shown in FIG.
It consists of a large diameter part 101, a tapered part 103 located below this, and a small diameter part 102 corresponding to the shape and dimensions of the inner periphery 14 of the opening end. The surface is configured to be connected to the inner circumferential surface (inner electrode 12) of the oxygen sensing element 1, and the upper surface of the large diameter portion 101 forms a spring receiving surface for the compression coil spring 17. A through hole 104 is bored in the center of the plug-like sleeve 10 over the entire length in the axial direction, into which the heater 23 can be inserted and held. Furthermore, a first slot 105 and a second slot 106 are formed in the plug-like sleeve 10 in the axial direction to communicate the inner cavity 54 at the upper part of the sleeve and the inner cavity 15 at the lower part of the sleeve. A communication path for introducing the atmosphere into the inner cavity 15 is formed by the slit. In the case of this embodiment, the first slit 105 is formed in a slit shape to communicate the through hole 104 with the circumferential surface of each part in the entire area from the upper end of the large diameter part 101 to the tapered part 103 and the lower end of the small diameter part 102. In addition, the second slit 106 leaves an extra thickness 107 from the large diameter portion 101 to the middle of the tapered portion 103, as shown by the hatching in FIG. A slit is formed in the range to communicate the through hole 104 with the peripheral surface. If a slit is formed from the middle of the tapered portion 103 to the lower end (in the case of this embodiment, the lower end of the small diameter portion 102) through the communication path, the portion where the slit is provided, that is, at least the portion of the tapered portion 103 The portion extending from the middle to the lower end of the plug-like sleeve 10 can be formed to be elastically deformable in the radial direction. On the other hand, in this embodiment, the heater 23 is a ceramic heater having a structure in which a thin metal heating element is embedded in a solid rod-shaped ceramic body.
It is connected to an external power source (not shown) by a power supply line 231 inserted through the . Note that the heating heater 23 and the plug-like sleeve 10 are connected to a portion of the upper surface of the large diameter portion 101 (for example, the excess thickness 10
In 7), it may be fixed by brazing or the like. The oxygen sensing element 1 and plug-shaped sleeve 10 described above
The oxygen sensing element section 100 is formed by the heater 23 and the main body of the oxygen concentration detector. Reference numeral 25 denotes a connecting tube made of a conductive material, which extends approximately in line with the axis of the tube body 5, into which the insulated tube 24 is inserted, and a flange formed at one end of the connecting tube is connected to the tube body. 5 and forms a spring receiving surface for the compression coil spring 17, facing the plug-like sleeve 10 across the inner cavity 54 of the coil spring 17. The other end of the connecting tube 25 is a lead wire 251 that connects to an external voltage detector (not shown).
It is connected to the. The operation of this embodiment in the above configuration will be explained. When assembling the oxygen concentration detector, a through hole 104 is formed in the inner periphery 14 of the open end of the oxygen sensing element 1 to allow the heating heater 23 to be inserted and held therein, and a communication path 105 is formed through which the atmosphere can be introduced into the inner cavity 15. , 106 is inserted, and this plug-like sleeve 10 is pressed by a compression coil spring 17 inserted between the flange at the lower end of the connecting pipe 25 and the upper surface of the large diameter portion 101 of the plug-like sleeve 10. do. With this configuration, the plug-like sleeve 10 and the insulator 16 are pressed into contact with each other by the spring force of the compression coil spring 17, and the lead wire 251-
The connecting pipe 25, the compression coil spring 17, and the plug-like sleeve 10 are electrically connected to the inner electrode 12, and when energized, a potential difference is created between the earthed outer electrode 13 and the oxygen in the exhaust gas. Concentration can be detected. In the case of this embodiment, the first slit 105 and the second slit 106 as communicating paths formed to introduce the atmosphere into the inner cavity 15 extend at least in the range from the tapered part 103 to the lower end of the small diameter part 102. Since the through hole 104 is formed in a slit shape that communicates with the circumferential surfaces of the tapered part 103 and the small diameter part 102, when the tapered part 103 is pressed against the inner circumference 14 of the opening end by the compression coil spring 17, spring force is applied. Due to the wedge action of the tapered portion 103, the plug-shaped sleeve 10 itself undergoes elastic deformation in the radial direction in the same way as the collector chuck, and the heating heater 23 inserted into the through hole 104 is narrowed and gripped, and the heating heater 23 is securely held. can be fixed to the inner electrode 12
Contact with the person can be prevented. Therefore, according to the structure of the plug-like sleeve 10 of this embodiment, there is no need to process and fix threads on the inner periphery of the open end 14, the plug-like sleeve 10, and even the heating heater 23, and It is possible to avoid an increase in the number of machining steps associated with partial machining, and also avoid the need for high machining accuracy and the deterioration of assemblability. Furthermore, by forming communicating paths 105 and 106 for introducing the atmosphere into the plug-like sleeve 10 itself as in this embodiment, communicating paths are formed in the heater 23 and the oxygen sensing element 1 (tubular body 11). It is not necessary to do so, and it is possible to increase the degree of freedom in design by increasing the number of communication passages or making the diameter of the communication passage relatively large, and it is possible to suppress problems such as clogging of the communication passages due to contamination with foreign matter. Therefore, the inner electrode 12 can always be placed in an atmosphere with an oxygen partial pressure equal to that of the atmosphere, and the oxygen partial pressure in the exhaust gas can always be accurately detected. Next, a second embodiment of the present invention will be described below. FIG. 3 shows a perspective view of a plug-shaped sleeve used in an oxygen concentration detector with a heater according to a second embodiment of the present invention. According to the present invention, the slot 316 formed in the plug-like sleeve 31 is formed on the side of the through hole 104,
The only difference from the first embodiment is that the lower end is formed in a slit shape to communicate the through hole 104 with the circumferential surface in the range from the middle of the tapered part to the lower end of the small diameter part 102. The configuration is the same as that of the first embodiment. Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims for utility model registration. be.
以上のように本考案によれば、少なくともテー
パ部より下端部分にスリツトを形成する連通路を
備えた栓状スリーブを酸素検知素子の開口端内周
に挿入し、かつコイルバネによつて押圧すること
により、栓状スリーブ内部に挿入された加熱用ヒ
ータをテーパ部の弾性変形によつて把持固定する
ことができる。
従つて、各部品にねじ部を形成して固定する必
要がなく、加工性、組付け性の向上をはかること
ができる。
As described above, according to the present invention, a plug-like sleeve having a communication passage forming a slit at least in the lower end portion than the tapered portion is inserted into the inner periphery of the open end of the oxygen sensing element, and is pressed by a coil spring. Accordingly, the heater inserted into the plug-like sleeve can be gripped and fixed by elastic deformation of the tapered portion. Therefore, it is not necessary to form threaded portions on each component to fix them, and it is possible to improve workability and assemblability.
第１図は加熱用ヒータ付酸素濃度検出器の縦断
面図、第２図は一実施例に係る栓状スリーブの斜
視図、第３図は他の実施例に係る栓状スリーブの
斜視図である。
１……酸素検知素子、１０……栓状スリーブ、
１１……固体電解質管状体、１２……内側電極、
１３……外側電極、１４……酸素検知素子の開口
端内周、１５……内腔、１７……圧接コイルバ
ネ、２３……加熱用ヒータ、５４……内腔、１０
１……大径部、１０３……テーパ部、１０４……
貫通孔、１０５，１０６，３１６……連通路（ス
リワリ）。
FIG. 1 is a longitudinal cross-sectional view of an oxygen concentration detector with a heater, FIG. 2 is a perspective view of a plug-shaped sleeve according to one embodiment, and FIG. 3 is a perspective view of a plug-shaped sleeve according to another embodiment. be. 1...Oxygen sensing element, 10...Plug-shaped sleeve,
11...Solid electrolyte tubular body, 12...Inner electrode,
DESCRIPTION OF SYMBOLS 13...Outer electrode, 14...Inner circumference of open end of oxygen sensing element, 15...Inner cavity, 17...Pressure coil spring, 23...Heating heater, 54...Inner cavity, 10
1...Large diameter part, 103...Tapered part, 104...
Through holes, 105, 106, 316... communication paths (suriwari).
Claims (1)
電極、外面に外側電極を設けた酸素検知素子と、
酸素検知素子の開口端内周に設けられた栓状スリ
ーブと、栓状スリーブに嵌合され酸素検知素子の
内腔に挿入された加熱用ヒータとからなる酸素検
知素子部を備えた加熱用ヒータ付酸素濃度検出器
において、 上記栓状スリーブは、上面にバネ受け面が形成
された大径部、大径部の下方において酸素検知素
子内周面に接触するテーパ部、中央を貫通し、ヒ
ータを挿入把持可能な貫通孔および酸素検知素子
の軸方向にわたつて形成され、スリーブ上部の内
腔とスリーブ下部の内腔とを連通する連通路を備
えており、この連通路は少なくともテーパ部から
スリーブ下端に至る範囲において貫通孔と周面と
を連通するスリツト部を形成しており、栓状スリ
ーブが酸素検知素子内部に収装され、コイルバネ
によつて押圧された際にスリツトによつてテーパ
部が半径方向に弾性変形可能に形成されることを
特徴とする加熱用ヒータ付酸素濃度検出器。[Claims for Utility Model Registration] An oxygen sensing element comprising an inner electrode on the inner surface and an outer electrode on the outer surface of a solid electrolyte tubular body with one end closed,
A heating heater equipped with an oxygen sensing element section consisting of a plug-like sleeve provided on the inner periphery of the open end of the oxygen sensing element, and a heating heater fitted into the plug-like sleeve and inserted into the inner cavity of the oxygen sensing element. In the oxygen concentration sensor with an attached oxygen concentration sensor, the plug-shaped sleeve has a large diameter portion with a spring receiving surface formed on the upper surface, a tapered portion below the large diameter portion that contacts the inner circumferential surface of the oxygen sensing element, and a heater. The oxygen sensing element has a through hole that can be inserted and grasped, and a communication path that is formed in the axial direction of the oxygen sensing element and communicates the inner cavity of the upper part of the sleeve with the inner cavity of the lower part of the sleeve. A slit portion is formed that communicates the through hole with the peripheral surface in the range reaching the lower end of the sleeve, and when the plug-like sleeve is housed inside the oxygen sensing element and is pressed by a coil spring, the slit tapers An oxygen concentration detector with a heater, characterized in that a portion is formed to be elastically deformable in a radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17324282U JPS5977058U (en) | 1982-11-16 | 1982-11-16 | Oxygen concentration detector with heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17324282U JPS5977058U (en) | 1982-11-16 | 1982-11-16 | Oxygen concentration detector with heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5977058U JPS5977058U (en) | 1984-05-24 |
| JPH0244206Y2 true JPH0244206Y2 (en) | 1990-11-22 |
Family
ID=30377444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17324282U Granted JPS5977058U (en) | 1982-11-16 | 1982-11-16 | Oxygen concentration detector with heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5977058U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0754313B2 (en) * | 1984-09-14 | 1995-06-07 | 株式会社日立製作所 | Oxygen concentration detector |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5010692A (en) * | 1973-05-25 | 1975-02-03 |
-
1982
- 1982-11-16 JP JP17324282U patent/JPS5977058U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5010692A (en) * | 1973-05-25 | 1975-02-03 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5977058U (en) | 1984-05-24 |
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