JPH0412419B2 - - Google Patents
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- Publication number
- JPH0412419B2 JPH0412419B2 JP58191446A JP19144683A JPH0412419B2 JP H0412419 B2 JPH0412419 B2 JP H0412419B2 JP 58191446 A JP58191446 A JP 58191446A JP 19144683 A JP19144683 A JP 19144683A JP H0412419 B2 JPH0412419 B2 JP H0412419B2
- Authority
- JP
- Japan
- Prior art keywords
- hole
- solid electrolyte
- base
- cap
- cylinder
- 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)
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は、壁に貫通穴を有する筒体の先端又は
その近傍に固体電解質を固定し、該固定電解質及
び貫通穴を測定ガスの流れの中に設置して筒体内
に負圧域を形成すると共に、筒体内の気体を貫通
穴を介して外部に排出するようにした酸素濃度測
定装置に関する。Detailed description of the invention [Technical field to which the invention pertains] The present invention fixes a solid electrolyte at or near the tip of a cylindrical body having a through hole in its wall, and controls the flow of a measurement gas by fixing the solid electrolyte and the through hole. The present invention relates to an oxygen concentration measuring device that is installed inside a cylinder to form a negative pressure region within the cylinder, and discharges gas inside the cylinder to the outside through a through hole.
従来から、固体電解質を備えた酸素濃度測定装
置として、例えば、第１図及び第２図に示すもの
がある。第１図において、酸素濃度測定装置は、
ベース１を先端に固定する筒体２と、無機質の接
着剤３で一体化される金属製フランジ４を有し、
このフランジ４を金属Ｏリング５を介在して筒体
のベース１にボルト締めで固定する試験管形ジル
コニア素子６と、ジルコニア素子６の先端壁両面
に固着する電極７及び８を介して信号を入力し、
所定の処理をし酸素濃度信号を出力する信号処理
部と（図示せず）、ジルコニア素子５を約700℃に
制御する温度制御部（図示せず）を有し、測定ガ
スの流れの中にジルコニア素子６を挿入設置し、
筒体２内からジルコニア素子６内部（電極８側）
に比較ガス（空気）を流込む構成となつている。
一方、第２図の酸素濃度測定装置は、Ｏリング１
０（有機質シール材）を介在して一体化されるね
じ部１１を有する試験管形ジルコニア素子１２
と、第１図における同様な信号処理部及び温度制
御部（いずれも図示せず）を有し、ジルコニア素
子１２の先端を炉内に挿入し、炉壁１３に設けら
れている取付口１４に有機質のシール材を介在し
てねじ部１１を螺合して固定し、ジルコニア素子
１２内部（電極８側）に比較ガス（空気）を流込
む構成となつている。尚、一般に、ジルコニア素
子１２は、Ｏリング１０（有機質シール材）の設
置箇所における温度をＯリング１０の使用温度限
度以下に抑えるために、その胴部は長くなつてい
る。
2. Description of the Related Art Conventionally, as an oxygen concentration measuring device equipped with a solid electrolyte, there are devices shown in FIGS. 1 and 2, for example. In FIG. 1, the oxygen concentration measuring device is
It has a cylindrical body 2 that fixes the base 1 at the tip, and a metal flange 4 that is integrated with an inorganic adhesive 3.
A signal is transmitted through a test tube-shaped zirconia element 6 which fixes this flange 4 to the base 1 of the cylinder body with bolts via a metal O-ring 5, and electrodes 7 and 8 which are fixed to both sides of the tip wall of the zirconia element 6. Input,
It has a signal processing section (not shown) that performs predetermined processing and outputs an oxygen concentration signal, and a temperature control section (not shown) that controls the zirconia element 5 at approximately 700°C. Insert and install the zirconia element 6,
From inside the cylinder 2 to the inside of the zirconia element 6 (electrode 8 side)
The structure is such that comparison gas (air) is flowed into.
On the other hand, the oxygen concentration measuring device shown in FIG.
A test tube-shaped zirconia element 12 having a threaded portion 11 that is integrated with 0 (organic sealing material) interposed therebetween.
It has a signal processing section and a temperature control section (both not shown) similar to those shown in FIG. The screw portion 11 is screwed and fixed with an organic sealing material interposed therebetween, and a comparison gas (air) is flowed into the inside of the zirconia element 12 (on the electrode 8 side). Generally, the body of the zirconia element 12 is long in order to keep the temperature at the location where the O-ring 10 (organic sealing material) is installed below the operating temperature limit of the O-ring 10.
以上の構成において、ジルコニア素子６や１２
は、約700℃の温度下で、かつ、比較ガスと測定
ガスとをジルコニア素子等で隔離した中で、両ガ
スの酸素濃度差に対応する信号を電極７及び８を
介して出力する。そして、信号処理部は、この信
号を入力し所定の演算をして酸素濃度信号を出力
する。 In the above configuration, the zirconia elements 6 and 12
outputs a signal corresponding to the difference in oxygen concentration between the two gases via electrodes 7 and 8 at a temperature of about 700° C. and with the comparison gas and measurement gas separated by a zirconia element or the like. Then, the signal processing section inputs this signal, performs a predetermined calculation, and outputs an oxygen concentration signal.
しかし、第１図の従来の装置にあつては、ジル
コニア素子６が700℃を超えると、ジルコニア素
子６とフランジ４の熱膨張差により接着剤３がひ
び割れや破損するため、比較ガスが測定電極７側
に漏出し、測定精度の低下を招く虞れがある。
又、第２図の従来の装置にあつては、ジルコニア
素子１２が長い構成となるため、コスト高となる
という問題がある。 However, in the conventional device shown in FIG. 1, when the temperature of the zirconia element 6 exceeds 700°C, the adhesive 3 cracks or breaks due to the difference in thermal expansion between the zirconia element 6 and the flange 4. There is a risk of leakage to the 7 side, resulting in a decrease in measurement accuracy.
Further, in the conventional device shown in FIG. 2, the zirconia element 12 has a long structure, which causes a problem of high cost.
本発明は、かかる点に鑑みてなされたものであ
り、その目的は、コスト高を招くことなく、測定
精度を高めた酸素濃度測定装置を提供するにあ
る。
The present invention has been made in view of this point, and an object thereof is to provide an oxygen concentration measuring device with improved measurement accuracy without increasing costs.
〔発明の構成〕
上記目的を達成した本発明の酸素濃度測定装置
は、酸素濃度差のある２種のガスを遮ぎる固体電
解質を備えた酸素濃度測定装置において、該固体
電解質を先端又はその近傍に固定する筒体であつ
て、前記固体電解質の固定位置より筒体の後端側
の壁に貫通穴を有する固体電解質保持部と、比較
ガスを前記固体電解質の筒体内側の壁近傍に連続
供給する手段を備え、前記貫通穴を測定ガスの流
れの中にして前記固体電解質保持部を設置したと
き、筒体内に負圧域を作ると共に、筒体内の気体
を前記貫通穴から筒体外に排出する流れを形成す
るように構成されている。[Structure of the Invention] The oxygen concentration measuring device of the present invention, which has achieved the above object, is an oxygen concentration measuring device equipped with a solid electrolyte that blocks two types of gases having a difference in oxygen concentration. a solid electrolyte holding part having a through hole in a wall on the rear end side of the cylinder from the fixed position of the solid electrolyte, and a comparison gas continuously connected to the solid electrolyte near the inner wall of the cylinder. When the solid electrolyte holding unit is installed with the through hole in the flow of measurement gas, a negative pressure region is created within the cylinder and the gas inside the cylinder is discharged from the through hole to the outside of the cylinder. The discharge flow is configured to form a discharge flow.
以下、図面を参照し本発明について詳しく説明
する。
Hereinafter, the present invention will be explained in detail with reference to the drawings.
第３図は、本発明の一実施例を示す図である。
酸素濃度測定装置は、試験管形ジルコニア素子２
０を先端に固定する筒体であつて、ジルコニア素
子２０の固定位置より筒体の後端側の壁に貫通穴
２１（貫通穴２１にはフイルタ２２が設置されて
いる）を有するジルコニア素子保持部２３と、比
較ガスをジルコニア素子２０の筒体内側の壁近傍
に連続供給する手段２４と、ジルコニア素子２０
の先端壁両面に固着する電極７及び８を介し、該
壁両面における酸素濃度差に対応する信号及び熱
電対２５で検出するジルコニア素子２０近傍の温
度信号を入力し、所定の処理をして測定ガスの酸
素濃度信号を出力する信号処理部（図示せず）を
有する。保持部２３の先端は、ジルコニア素子２
０の設置基盤となるベース２６及びこのベース２
６にジルコニア素子２０を設置して固定する略円
筒形のキヤツプ２７で構成される。ベース２６
は、比較ガス供給手段２４を挿通する貫通穴２８
と、熱電対２５を挿通する貫通穴２９と、校正ガ
ス供給パイプ３０に結合する貫通穴３１と、ベー
ス２６の内と外を連通する貫通穴３２とを有す
る。又、キヤツプ２７は、底部に形成する貫通穴
３３と、側壁に形成する貫通穴３４及び３５を有
し、パツキング３６及び３７を介在してジルコニ
ア素子２０をベース２６に固定し、筒体２３と一
体構成となつている。この一体化は、比較ガス供
給手段２４の先端をジルコニア素子２０の中に挿
入すると共に、貫通穴２９と３４、貫通穴３１と
３５夫々を結合して行われる。この構成にあつて
は、貫通穴３２は、ジルコニア素子２０の外側
（測定ガスと接触する側）と筒体２３との連通孔
となつている。 FIG. 3 is a diagram showing an embodiment of the present invention.
The oxygen concentration measuring device is a test tube type zirconia element 2
0 is fixed at the tip, and has a through hole 21 (a filter 22 is installed in the through hole 21) in the wall on the rear end side of the cylinder from the fixing position of the zirconia element 20. 23, a means 24 for continuously supplying the comparison gas to the vicinity of the inner wall of the cylindrical body of the zirconia element 20, and
A signal corresponding to the oxygen concentration difference on both sides of the wall and a temperature signal near the zirconia element 20 detected by the thermocouple 25 are input through electrodes 7 and 8 fixed to both sides of the tip wall, and are subjected to predetermined processing and measured. It has a signal processing section (not shown) that outputs a gas oxygen concentration signal. The tip of the holding part 23 is attached to the zirconia element 2
Base 26, which is the installation base for 0, and this base 2
6 and a substantially cylindrical cap 27 on which a zirconia element 20 is installed and fixed. base 26
is a through hole 28 through which the comparison gas supply means 24 is inserted.
, a through hole 29 through which the thermocouple 25 is inserted, a through hole 31 connected to the calibration gas supply pipe 30, and a through hole 32 through which the inside and outside of the base 26 communicate. The cap 27 also has a through hole 33 formed at the bottom and through holes 34 and 35 formed at the side wall, and the zirconia element 20 is fixed to the base 26 with packings 36 and 37 interposed therebetween, and the cylindrical body 23 and It has an integrated structure. This integration is carried out by inserting the tip of the comparison gas supply means 24 into the zirconia element 20 and connecting the through holes 29 and 34 and the through holes 31 and 35, respectively. In this configuration, the through hole 32 serves as a communication hole between the outside of the zirconia element 20 (the side that comes into contact with the measurement gas) and the cylindrical body 23 .
上記ジルコニア素子２０は、保持部（筒体）２
３の貫通穴２１を600〜1000℃の測定ガスの流れ
の中に位置させ、保持部２３（フランジと一体構
成の場合フランジ）を炉壁の取付口に固定して設
置される。 The zirconia element 20 has a holding part (cylindrical body) 2
The through hole 21 of No. 3 is located in the flow of the measurement gas at 600 to 1000° C., and the holding portion 23 (or flange if integrated with the flange) is fixed to the attachment port of the furnace wall.
以上の構成において、ジルコニア素子２０は、
第４図で示す矢印Ｘ方向の測定ガスの流れの中に
あつて（第４図における各符号は第３図に付した
ものと同じ）、その内部は比較ガス供給手段２４
からの比較ガスで満たされる。そして、測定ガス
と比較ガスの酸素濃度差に対応する信号、即ち、
ネルンストの式に基づく信号を電極７及び８を介
して出力する。信号処理部は、この信号と熱電対
２５による信号を入力し、所定の演算をして酸素
濃度信号を出力する。 In the above configuration, the zirconia element 20 is
It is in the flow of the measurement gas in the direction of the arrow X shown in FIG. 4 (each reference numeral in FIG. 4 is the same as that attached to FIG.
Filled with comparative gas from. Then, a signal corresponding to the difference in oxygen concentration between the measurement gas and the comparison gas, that is,
A signal based on Nernst's equation is output via electrodes 7 and 8. The signal processing section inputs this signal and the signal from the thermocouple 25, performs predetermined calculations, and outputs an oxygen concentration signal.
一方、保持部２３の外側を流れる測定ガスの流
れは、貫通穴２１近傍の気体をまき込んで流れる
ため、ベルヌーイの法則により保持部２３の内部
に負圧域が形成される。本考案者らの実験によれ
ば、第３図に示す測定点P1及びP2における圧力
P1及びP2と測定ガスの流速ｖの関係は第５図に
示す結果となつた。このため、この負圧域に向け
て流れ込む気体は、貫通穴２１から保持部２３の
外に向けた流れとなつて排出される。即ち、ジル
コニア素子２０内の比較ガスは、圧力測定点P1
への流れとなつて貫通穴２１から排出されると共
に、圧力測定点P2の測定ガスは、貫通穴３２や
３４（２９）を介して圧力測定点P1への流れと
なつて貫通穴２１から排出される。従つて、比較
ガスが測定電極７側に、又、測定ガスが比較電極
８側に漏出することがない。 On the other hand, since the flow of the measurement gas flowing outside the holding part 23 entrains the gas near the through hole 21, a negative pressure region is formed inside the holding part 23 according to Bernoulli's law. According to the inventors' experiments, the pressure at measurement points P 1 and P 2 shown in Figure 3
The relationship between P 1 and P 2 and the flow velocity v of the measured gas was as shown in FIG. Therefore, the gas flowing toward this negative pressure region flows out of the holding portion 23 from the through hole 21 and is discharged. That is, the comparison gas in the zirconia element 20 is at the pressure measurement point P 1
At the same time, the measurement gas at the pressure measurement point P2 flows to the pressure measurement point P1 via the through holes 32 and 34 (29) and is discharged from the through hole 21. is discharged from. Therefore, the comparison gas will not leak to the measurement electrode 7 side, and the measurement gas will not leak to the comparison electrode 8 side.
尚、本発明は、上記実施例に限定するものでは
なく、保持部の貫通穴２１の数をより多く、逆に
少なくしてもよく、フイルタ２２は必要に応じて
設置すればよい。又、ジルコニア素子２０を保持
部の先端よりやや中に入れて（後端側に移動）固
定してもよい。更に、ジルコニア素子を他の固体
電解質に代えてもよい。 Note that the present invention is not limited to the above-mentioned embodiment, and the number of through holes 21 in the holding portion may be increased or decreased, and the filter 22 may be installed as necessary. Alternatively, the zirconia element 20 may be placed slightly inside the holding portion from the tip (moved toward the rear end) and fixed. Furthermore, the zirconia element may be replaced with another solid electrolyte.
以上説明した通り、本発明の酸素濃度測定装置
によれば、壁に貫通穴を有する筒体（保持部）の
先端又はその近傍に固体電解質を固定し、該固体
電解質及び貫通穴を測定ガスの流れの中に設置し
て筒体内に負圧域を形成すると共に、筒体内の気
体を貫通穴を介して外部に排出するようにしたた
め、固体電解質の長さや形状に関係なく、又、比
較電極側と測定電極側を完全なシール構成とする
ことなく、比較ガスが測定電極側に、逆に測定ガ
スが比較電極側に漏出することを防ぐことができ
る。従つて、コスト高を招くことなく、測定精度
を高めることができる。
As explained above, according to the oxygen concentration measuring device of the present invention, a solid electrolyte is fixed at or near the tip of a cylindrical body (holding part) having a through hole in the wall, and the solid electrolyte and the through hole are connected to the measuring gas. Because it is installed in the flow and forms a negative pressure region inside the cylinder, and the gas inside the cylinder is discharged to the outside through the through hole, it is possible to use the reference electrode regardless of the length or shape of the solid electrolyte. It is possible to prevent the comparison gas from leaking to the measurement electrode side, and conversely from leaking the measurement gas to the comparison electrode side, without creating a complete seal between the side and the measurement electrode side. Therefore, measurement accuracy can be improved without increasing costs.
第１図及び第２図は、従来例を示す図、第３図
は、本発明の一実施例を示す図、第４図は、測定
ガスの流れを示す図、第５図は、保持部（筒体）
内の圧力と測定ガスの流速の関係を示す図であ
る。
７……測定電極、８……比較電極、２０……ジ
ルコニア素子、２１……筒体の壁に設けた貫通
穴、２３……保持部（筒体）、２４……比較ガス
供給手段、２６……ベース、２７……キヤツプ、
２８，２９，３１，３２，３３，３４，３５……
貫通穴、３６，３７……パツキング。
1 and 2 are diagrams showing a conventional example, FIG. 3 is a diagram showing an embodiment of the present invention, FIG. 4 is a diagram showing the flow of measurement gas, and FIG. 5 is a diagram showing a holding section. (cylindrical body)
FIG. 4 is a diagram showing the relationship between the internal pressure and the flow rate of the measurement gas. 7... Measuring electrode, 8... Comparative electrode, 20... Zirconia element, 21... Through hole provided in the wall of the cylinder, 23... Holding part (cylindrical body), 24... Comparative gas supply means, 26 ...Base, 27...Cap,
28, 29, 31, 32, 33, 34, 35...
Through holes, 36, 37...Packing.
Claims (1)
解質を備えた酸素濃度測定装置において、該固体
電解質を先端又はその近傍に固定する筒体であつ
て前記固体電解質の固定位置より筒体の後端側の
壁に第１の貫通穴を有する固体電解質保持部と、
先端が前記固体電解質の内側である比較ガス側に
挿設され比較ガスを前記固体電解質の筒体内側の
壁近傍に連続供給する手段と、前記固体電解質保
持部の先端部で構成され前記固体電解質の設置基
盤となるベースと、該ベースに前記固体電解質を
設置して固定する略円筒形のキヤツプと、前記ベ
ースに設けられ前記比較ガス供給手段を挿通する
第２貫通穴と、前記ベースに設けられ熱伝対を挿
通する第３貫通穴と、前記ベースに設けられ校正
ガス供給パイプに結合するように形成された第４
貫通穴と、前記ベースに設けられ前記ベースの内
側である比較ガス側と前記ベースの外側である測
定ガス側を連通する第５貫通穴と、前記キヤツプ
の底部に設けられた第６貫通穴と、前記第３貫通
穴と前記キヤツプの内部を連通するようにして前
記キヤツプの側壁部に形成された第７貫通穴と、
前記第４貫通穴と前記キヤツプの内部を連通する
ようにして前記キヤツプの側壁部に形成された第
８貫通穴と、前記固体電解質と前記ベース及びキ
ヤツプとの間に配設され該固体電解質を前記ベー
ス及びキヤツプに密着させる第１及び第２のパツ
キンとを備え、前記第１貫通穴を測定ガスの流れ
の中において前記固体電解質保持部を設置したと
き、前記筒体内に負圧域を形成すると共に、前記
筒体内の気体を前記第１貫通穴から前記筒体の外
に排出する流れを形成することを特徴とする酸素
濃度測定装置。1. In an oxygen concentration measuring device equipped with a solid electrolyte that blocks two types of gases with different oxygen concentrations, a cylinder that fixes the solid electrolyte at or near its tip, and that is located at the rear of the cylinder from the position where the solid electrolyte is fixed. a solid electrolyte holding part having a first through hole in the end wall;
means for continuously supplying the comparison gas to the inner wall of the cylinder of the solid electrolyte, the tip of which is inserted into the comparison gas side inside the solid electrolyte; and the tip of the solid electrolyte holding part, the solid electrolyte a base serving as an installation base; a substantially cylindrical cap for installing and fixing the solid electrolyte on the base; a second through hole provided in the base through which the comparison gas supply means is inserted; a third through hole into which the thermocouple is inserted; and a fourth through hole formed in the base and connected to the calibration gas supply pipe.
a through hole, a fifth through hole provided in the base and communicating between a comparison gas side, which is the inside of the base, and a measurement gas side, which is the outside of the base; and a sixth through hole, which is provided in the bottom of the cap. , a seventh through hole formed in a side wall of the cap so as to communicate the third through hole with the inside of the cap;
an eighth through hole formed in a side wall of the cap so as to communicate the fourth through hole with the inside of the cap; and an eighth through hole disposed between the solid electrolyte and the base and the cap, and an eighth through hole that communicates with the inside of the cap; first and second packings that are brought into close contact with the base and the cap, and when the solid electrolyte holding part is installed in the flow of the measurement gas through the first through hole, a negative pressure region is formed in the cylinder body. At the same time, the oxygen concentration measuring device is characterized in that a flow is formed to discharge the gas inside the cylinder to the outside of the cylinder through the first through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58191446A JPS6082849A (en) | 1983-10-13 | 1983-10-13 | Oxygen concentration measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58191446A JPS6082849A (en) | 1983-10-13 | 1983-10-13 | Oxygen concentration measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6082849A JPS6082849A (en) | 1985-05-11 |
| JPH0412419B2 true JPH0412419B2 (en) | 1992-03-04 |
Family
ID=16274754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58191446A Granted JPS6082849A (en) | 1983-10-13 | 1983-10-13 | Oxygen concentration measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6082849A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6237765U (en) * | 1985-08-24 | 1987-03-06 | ||
| JPS6358152A (en) * | 1986-08-28 | 1988-03-12 | Ngk Insulators Ltd | Industrial oxygen concentration measuring apparatus |
-
1983
- 1983-10-13 JP JP58191446A patent/JPS6082849A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6082849A (en) | 1985-05-11 |
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