JP2013221805A - Exhaust gas analyzer and probe unit - Google Patents
Exhaust gas analyzer and probe unit Download PDFInfo
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- JP2013221805A JP2013221805A JP2012092494A JP2012092494A JP2013221805A JP 2013221805 A JP2013221805 A JP 2013221805A JP 2012092494 A JP2012092494 A JP 2012092494A JP 2012092494 A JP2012092494 A JP 2012092494A JP 2013221805 A JP2013221805 A JP 2013221805A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/108—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using optical methods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/022—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an optical sensor, e.g. in-cylinder light probe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
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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
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
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Abstract
Description
本発明は、例えば船舶用の内燃機関やボイラ、廃棄物燃焼炉、工業用炉等に係る燃焼装置の排気管に取り付けられて、該排気管内を流れる排ガスに含まれる酸素や窒素酸化物等の所定成分を分析する排ガス分析装置及びこれに用いられるプローブユニットに関するものである。 The present invention is attached to an exhaust pipe of a combustion apparatus related to, for example, an internal combustion engine for a ship, a boiler, a waste combustion furnace, an industrial furnace, and the like, such as oxygen and nitrogen oxide contained in exhaust gas flowing in the exhaust pipe. The present invention relates to an exhaust gas analyzer for analyzing a predetermined component and a probe unit used therefor.
この種の排ガス分析装置として、特許文献１に示すように、排気管内に直接挿入して取り付けたプローブユニットにより排ガスをサンプリングすると共に、その排ガス中の所定成分を検出するものが知られている。 As this type of exhaust gas analyzer, as shown in Patent Document 1, an exhaust gas sampled by a probe unit directly inserted into an exhaust pipe and attached and a predetermined component in the exhaust gas is detected.
具体的にこのプローブユニットは、筒状をなすケーシングと、このケーシング内部に収容されて前記排ガスの所定成分を検知するガスセンサとを具備している。そして、従来のガスセンサは、前記ケーシングの先端面に複数箇所でネジ止め固定されている（例えば、特許文献１の段落００４０等参照）。 Specifically, the probe unit includes a cylindrical casing and a gas sensor that is housed in the casing and detects a predetermined component of the exhaust gas. The conventional gas sensor is fixed to the front end surface of the casing with screws at a plurality of locations (see, for example, paragraph 0040 of Patent Document 1).
しかしながら、例えば船舶の排気管（煙突）などでは好適な作業環境を確保できるとは限らないので、例えばセンサを交換するときなどにおいて、比較的小さな部品であるネジをしかも複数脱着するという作業が極めて煩雑かつ困難になる場合がある。具体的には、ネジを落とすとかネジ頭を潰すといった事態が容易に生じ得る。 However, for example, a suitable working environment cannot always be secured in a ship exhaust pipe (chimney) or the like, and therefore, for example, when replacing a sensor, an operation of attaching and removing a plurality of screws, which are relatively small parts, is extremely difficult. It can be cumbersome and difficult. Specifically, a situation where a screw is dropped or a screw head is crushed can easily occur.
また、例えばかかる船舶の排ガスには煤が多く含まれるうえに５００℃以上の高温になることもあり、ネジ頭に煤が溜まっていたり、ネジがケーシングに焼き付いていたりする場合もあるので、こういった場合には作業困難性がさらに助長されることとなる。 In addition, for example, the exhaust gas of such ships may contain a lot of soot and may reach a high temperature of 500 ° C or higher, so that soot may accumulate on the screw head or the screw may be seized into the casing. In such a case, work difficulty is further promoted.
本発明は、かかる問題点を解決すべくなされたものであって、初期の組立や取付のときのみならず、メンテナンスなどでガスセンサを交換するときなどにおいても、好適な作業性を担保できる排ガス分析装置を提供することをその主たる所期課題とするものである。 The present invention has been made to solve such problems, and it is an exhaust gas analysis that can ensure a favorable workability not only at the time of initial assembly and mounting, but also when replacing a gas sensor for maintenance or the like. Providing a device is the main intended task.
すなわち本発明に係る排ガス分析装置は、排気管に挿入されて該排気管を流れる排ガスをサンプリングし、所定成分のガス成分を分析するものであって、前記排ガス中の所定成分を検知するガスセンサと、前記ガスセンサを内部に収容するケーシングとを具備し、前記ケーシングが、ボディ及びこのボディに螺合して取り付けられるキャップ部材からなり、前記キャップ部材をボディに螺合締結することにより前記ガスセンサがキャップ部材及びボディに挟み込まれてケーシング内に固定されるように構成してあることを特徴とする。 In other words, an exhaust gas analyzer according to the present invention samples an exhaust gas that is inserted into an exhaust pipe and flows through the exhaust pipe, analyzes a gas component of a predetermined component, and detects a predetermined component in the exhaust gas, A casing that houses the gas sensor therein, the casing comprising a body and a cap member that is screwed onto the body, and the gas sensor is capped by screwing and fastening the cap member to the body. It is configured to be sandwiched between the member and the body and fixed in the casing.
このようなものであれば、ケーシングのキャップ部材をボディに螺合・締結するだけで、ガスセンサをケーシング内に固定できるので、交換や組み立ての作業性が大幅に向上するだけでなく、キャップ部材という単一の比較的大型な部品をボディに螺合させる構造であるため、高温での焼付も生じにくい。また、キャップ部材の外側周面に螺合締結のための平面部を設けておけば、煤が溜まってキャップ部材を外せなくなるといった不具合も回避することが容易にできる。
なお、ここでいう排気管とは、燃焼機関から排ガスを排出するための管のことであり、煙突なども含まれる。
In such a case, since the gas sensor can be fixed in the casing simply by screwing and fastening the cap member of the casing to the body, not only the workability of replacement and assembly is greatly improved, but also the cap member. Since the structure is such that a single relatively large part is screwed into the body, seizure at high temperatures is unlikely to occur. Further, if a flat portion for screwing and fastening is provided on the outer peripheral surface of the cap member, it is possible to easily avoid a problem that the cap member cannot be removed due to accumulation of wrinkles.
The exhaust pipe here is a pipe for discharging exhaust gas from the combustion engine, and includes a chimney or the like.
前記ガスセンサが、所定成分を検知するためのセンシング機構を有したセンサ本体と、該センサ本体に一体的に取り付けられたヘッド部と具備するものであり、前記ヘッド部がキャップ部材とボディとの間に挟み込まれるように構成したものであれば、その挟み込み力がセンサ本体に直接作用しないので、センシング機構に不具合が生じることを未然に防げるし、センサ本体をボディ内部に入れて断熱性を高め、測定精度を向上させるといったことも可能になる。 The gas sensor includes a sensor main body having a sensing mechanism for detecting a predetermined component, and a head unit integrally attached to the sensor main body, and the head unit is between the cap member and the body. If it is configured to be sandwiched between the sensor body, the sandwiching force does not act directly on the sensor body, so that it is possible to prevent the sensing mechanism from malfunctioning, and the sensor body is placed inside the body to improve heat insulation, It is also possible to improve measurement accuracy.
ガスセンサの位置決めを確実に行えるようにするには、キャップ部材とガスセンサとの当たり面、又はボディとガスセンサとの当たり面に、キャップ部材の螺合による進退軸線方向に対して斜めに傾いたテーパ面が形成してあり、キャップ部材をボディに締結したときに、前記テーパ面の作用によって、前記進退軸線と直交する方向に対するガスセンサの位置決めが行われるように構成してあるものが好ましい。 In order to ensure the positioning of the gas sensor, a tapered surface inclined obliquely with respect to the advancing and retreating axial direction by screwing of the cap member on the contact surface of the cap member and the gas sensor or the contact surface of the body and the gas sensor. Preferably, the gas sensor is positioned with respect to the direction orthogonal to the advance / retreat axis by the action of the tapered surface when the cap member is fastened to the body.
前記ボディがその先端部にガスセンサを挿入するための挿入口を形成した概略円筒状をなすものであるとともに、前記キャップ部材が前記ボディと略同一の外径を有する概略円筒状をなすものであり、キャップ部材をボディの先端部に螺合締結した状態において、キャップ部材の外側周面とボディの外側周面とが略面一となるように構成してあれば、排気管への取り付けや取り外しの際に、ケーシングが引っ掛かるといった不具合を回避できるし、煤が多く溜まるような箇所を減らすこともできる。 The body has a substantially cylindrical shape in which an insertion port for inserting a gas sensor is formed at the tip thereof, and the cap member has a substantially cylindrical shape having substantially the same outer diameter as the body. If the outer circumferential surface of the cap member and the outer circumferential surface of the body are substantially flush with each other in a state where the cap member is screwed and fastened to the front end portion of the body, it can be attached to or removed from the exhaust pipe. In this case, it is possible to avoid problems such as the casing being caught, and it is possible to reduce the number of places where a lot of wrinkles are accumulated.
このように構成した本発明によれば、ケーシングのキャップ部材をボディに螺合・締結するだけで、ガスセンサをケーシング内に固定できるので、交換や組み立ての作業性が大幅に向上するだけでなく、キャップ部材という単一の比較的大型な部品をボディに螺合させる構造であるため、高温での焼付も生じにくいし、煤が溜まって外せなくなるといった不具合も生じ得ない。 According to the present invention configured as described above, the gas sensor can be fixed in the casing simply by screwing and fastening the cap member of the casing to the body, so that not only the workability of replacement and assembly is greatly improved, Since it is a structure in which a single relatively large part called a cap member is screwed into the body, it is difficult for seizure at high temperatures to occur, and there is no possibility of defects such as accumulation of wrinkles.
以下、本発明に係る排ガス分析装置の一実施形態について図面を参照して説明する。 Hereinafter, an embodiment of an exhaust gas analyzer according to the present invention will be described with reference to the drawings.
本実施形態に係る排ガス分析装置１００は、例えば船舶用エンジンの排気管に取り付けられて、その内部を流れる排ガスに含まれる所定成分（例えばＮＯＸ、ＳＯＸ、ＣＯ２、ＣＯ等）を分析する直接挿入型のものである。 The exhaust gas analyzer 100 according to the present embodiment is attached to, for example, an exhaust pipe of a marine engine, and analyzes predetermined components (for example, NO X , SO X , CO 2 , CO, etc.) contained in the exhaust gas flowing through the exhaust pipe. It is a direct insertion type.
具体的にこのものは、図１に示すように、内部に前記所定成分を検出するセンサ本体３２を有したプローブユニット１と、該プローブユニット１からの検出信号を受信して排ガスに含まれる所定成分を分析する分析ユニット（図示しない）と、排気管に固定するためのフランジ状の取付部６とを具備したもので、この排ガス分析装置１００を排気管に取り付けた状態では、該排気管内にプローブユニット１の先端部が突出するように構成してある。
しかして、本実施形態の特徴はプローブユニット１にあることから、以下では、プローブユニット１について詳述する。
Specifically, as shown in FIG. 1, this is a probe unit 1 having a sensor body 32 for detecting the predetermined component therein, and a predetermined signal included in the exhaust gas upon receiving a detection signal from the probe unit 1. It comprises an analysis unit (not shown) for analyzing the components and a flange-like mounting portion 6 for fixing to the exhaust pipe. When the exhaust gas analyzer 100 is attached to the exhaust pipe, The distal end portion of the probe unit 1 is configured to protrude.
Therefore, since the feature of this embodiment is in the probe unit 1, the probe unit 1 will be described in detail below.
このプローブユニット１は、長尺円筒状をなしその先端面に内部に排ガスを導入するためのガス導入孔２ａを開口させたケーシング２と、このケーシング２の内部に保持されたガスセンサ３とを具備したものである。
ケーシング２は、図２に示すように、二重管構造をなす長尺状のボディ４と、このボディ４の先端部に螺合して取り付けられるキャップ部材５とを具備している。
This probe unit 1 has a long cylindrical shape and a casing 2 having a gas introduction hole 2a for introducing exhaust gas into the inside at the tip surface thereof, and a gas sensor 3 held inside the casing 2. It is a thing.
As shown in FIG. 2, the casing 2 includes a long body 4 having a double-pipe structure and a cap member 5 that is screwed onto and attached to a distal end portion of the body 4.
ボディ４は、図２に示すように、二重管構造にして外管４１と内管４２との間に断熱層となる空気層を形成することによって、内管４２に収容したガスセンサ３に外部の温度影響ができるだけ及ばないように構成したものである。このボディ４の先端には外管４１と内管４２との間の開口を封止するための円環状の封止板材４３が溶接等によって一体に接合してあり、この封止板材４３の中央孔４ｂが後述するガスセンサ３の基端部を内管４２内に挿入するための挿入口となるようにしてある。 As shown in FIG. 2, the body 4 has a double tube structure and an air layer serving as a heat insulating layer between the outer tube 41 and the inner tube 42, so that the gas sensor 3 accommodated in the inner tube 42 is externally connected. It is configured so that the temperature influence of the temperature is as small as possible. An annular sealing plate 43 for sealing the opening between the outer tube 41 and the inner tube 42 is integrally joined to the tip of the body 4 by welding or the like. The hole 4 b serves as an insertion port for inserting a base end portion of the gas sensor 3 described later into the inner tube 42.
キャップ部材５は、図２に示すように、ボディ４と同一の外径を有する短尺円筒状をなす円筒部５１と、円筒部５１の先端に設けた円形状をなす先端板５２とを一体に形成したものであり、前記先端板５２の中央には、円形状の前記ガス導入孔２ａが貫通させてある。また、円筒部５１の基端部内周面には、めねじ部５１ｂが設けてあって、このめねじ部５１ｂを前記ボディ４の先端部外周面に設けたおねじ部４ａに螺合させることにより、キャップ部材５をボディ４に取り付けることができるように構成してある。 As shown in FIG. 2, the cap member 5 integrally includes a cylindrical portion 51 having a short cylindrical shape having the same outer diameter as that of the body 4 and a circular tip plate 52 provided at the tip of the cylindrical portion 51. The circular gas introduction hole 2a is penetrated in the center of the tip plate 52. Further, a female screw portion 51 b is provided on the inner peripheral surface of the base end portion of the cylindrical portion 51, and this female screw portion 51 b is screwed into a male screw portion 4 a provided on the outer peripheral surface of the distal end portion of the body 4. Thus, the cap member 5 can be attached to the body 4.
なお、該キャップ部材５をボディ４に締結するために、前記先端板５２にはスパナ等の締結治具を係合させるための例えば正方形板状をなす治具係合部５３が一体に設けてある。
ガスセンサ３は、図２に示すように、概略円柱状をなすセンサ本体３２と、このセンサ本体３２の先端部に外嵌するように固定されたヘッド部３３とを具備するものである。
In order to fasten the cap member 5 to the body 4, a jig engaging portion 53 having, for example, a square plate shape for engaging a fastening jig such as a spanner is integrally provided on the tip plate 52. is there.
As shown in FIG. 2, the gas sensor 3 includes a sensor body 32 having a substantially columnar shape, and a head portion 33 fixed so as to be fitted around the distal end portion of the sensor body 32.
センサ本体３２の基端部内部には、図示しないセンサ素子又はセンシング構造が収容してあり、先端部には、内部のセンサ素子に排ガスを導くためのガス流入口３ｂが設けてある。なお、センサ本体３２の基端部から延出させてある符号Ｃは、前記分析ユニットにセンシング信号を伝送するためのケーブルである。また、符号３４は、センサ本体３２をヘッド部３３に締結するときに用いるナット部である。 A sensor element or a sensing structure (not shown) is accommodated inside the base end portion of the sensor main body 32, and a gas inlet 3b for introducing exhaust gas to the internal sensor element is provided at the distal end portion. Note that a symbol C extending from the base end portion of the sensor body 32 is a cable for transmitting a sensing signal to the analysis unit. Reference numeral 34 denotes a nut portion used when the sensor main body 32 is fastened to the head portion 33.
ヘッド部３３は、センサ本体３２よりも大きな外径を有する円柱状の大径部３３ａと、この大径部３３ａの先端側に一体に設けられた小径部３３ｂとからなるものであり、その中央には軸線方向に貫通するセンサ保持孔３３ｃが設けてある。このセンサ保持孔３３ｃの基端部には、めねじ３２ａが形成してあり、このめねじ３２ａにセンサ本体３２の外周面に設けたおねじ３２ｂを螺合締結することにより、このヘッド部３３がセンサ本体３２の先端部に外嵌固定されるように構成してある。この構成によりセンサ交換時にはヘッド部３３をボディ４から外せばヘッド部３３に固定されたセンサ本体３２も同時に抜き出せるため、交換にかかる時間を短縮できる。また、小径部３３ｂの先端部外周面には、後述するフィルタ取付リング９が螺合するおねじ３３１が形成してある。小径部３３ｂには、スパナ等でヘッド部３３を固定可能にするための切り込みを周面に入れることにより、センサ交換時にヘッド部３３とセンサ本体３２とを取り外ししやすくしている。 The head portion 33 is composed of a cylindrical large-diameter portion 33a having an outer diameter larger than that of the sensor main body 32, and a small-diameter portion 33b provided integrally on the distal end side of the large-diameter portion 33a. Is provided with a sensor holding hole 33c penetrating in the axial direction. A female screw 32a is formed at the base end portion of the sensor holding hole 33c, and a male screw 32b provided on the outer peripheral surface of the sensor main body 32 is screwed and fastened to the female screw 32a. Is configured to be externally fitted and fixed to the tip of the sensor body 32. With this configuration, when the sensor is replaced, if the head part 33 is removed from the body 4, the sensor main body 32 fixed to the head part 33 can be extracted at the same time, so that the time required for replacement can be shortened. Moreover, the external thread 331 which the filter attachment ring 9 mentioned later is screwed is formed in the front-end | tip part outer peripheral surface of the small diameter part 33b. The small-diameter portion 33b is provided with a notch for allowing the head portion 33 to be fixed with a spanner or the like on the peripheral surface, thereby making it easy to remove the head portion 33 and the sensor main body 32 when replacing the sensor.
次に、かかる構成のプローブユニット１の組み立て方法について説明する。
まず、図２、図３に示すように、ボディ４の先端部に設けた挿入口４ｂからガスセンサ３を内管４２に挿入する。このとき、ボディ４の先端面、すなわち封止板材４３の表面８ｃに、図示しないパッキンを介し、ガスセンサ３のヘッド部基端面８ｄがそのパッキンに当接して、さらに、ガスセンサ３に形成したガス導入経路Ｌ２の突出管Ｌ２ａがボディ４のガス導入経路Ｌ１にはめ込まれ、センサ本体３２の基端部のみが内管４２に挿入され、ヘッド部３３はボディ４の軸方向外側に配置される。
Next, a method for assembling the probe unit 1 having such a configuration will be described.
First, as shown in FIGS. 2 and 3, the gas sensor 3 is inserted into the inner tube 42 from the insertion port 4 b provided at the distal end portion of the body 4. At this time, the head portion base end surface 8d of the gas sensor 3 is brought into contact with the front end surface of the body 4, that is, the surface 8c of the sealing plate 43 through a packing (not shown), and the gas introduction formed in the gas sensor 3 is further performed. The protruding tube L2a of the path L2 is fitted into the gas introduction path L1 of the body 4, only the proximal end portion of the sensor body 32 is inserted into the inner tube 42, and the head portion 33 is disposed on the outer side in the axial direction of the body 4.
そして、図４に示すように、キャップ部材５のめねじ部５１ｂとボディ４のおねじ部４ａとを螺合させて、キャップ部材５をボディ４に取り付けるが、この過程で、ガスセンサ３は、キャップ部材５とボディ４とに挟み込まれてケーシング２に固定される。 Then, as shown in FIG. 4, the female screw part 51 b of the cap member 5 and the male screw part 4 a of the body 4 are screwed together to attach the cap member 5 to the body 4. In this process, the gas sensor 3 It is sandwiched between the cap member 5 and the body 4 and fixed to the casing 2.
より具体的に説明する。キャップ部材５において、そのガス導入孔２ａの基端部内周面には、基端側に向かうに連れ内径が大きくなるように形成した第１周回テーパ面８ｂが設けられている一方、ヘッド部３３において、小径部３３ｂの基端部には、基端側に向かうに連れ外径が大きくなるように形成した第２周回テーパ面８ａが設けられている。そして、キャップ部材５をボディ４に螺合させて締結していくと、前記周回テーパ面８ａ、８ｂ同士が当たり、ヘッド部３３をボディ４側に押し付けるとともに、そのときにテーパ面８ａ、８ｂ同士の接触によって生じる半径方向の力によって、ヘッド部３３をその中心軸線がボディ４の中心軸線に合致するように位置決めする。
このようにして、キャップ部材５の第１周回テーパ面８ｂとボディ４の先端面８ｃとの間でヘッド部３３が挟み込まれて、ガスセンサ３がケーシング２に固定される。
This will be described more specifically. In the cap member 5, the inner circumferential surface of the base end portion of the gas introduction hole 2 a is provided with a first circumferential taper surface 8 b formed so that the inner diameter increases toward the base end side, while the head portion 33. The second end taper surface 8a is formed at the base end portion of the small diameter portion 33b so that the outer diameter increases toward the base end side. When the cap member 5 is screwed into the body 4 and fastened, the circumferential taper surfaces 8a and 8b come into contact with each other, and the head portion 33 is pressed against the body 4 side. At that time, the taper surfaces 8a and 8b are The head portion 33 is positioned so that its central axis line coincides with the central axis line of the body 4 by the radial force generated by the contact.
In this way, the head portion 33 is sandwiched between the first circumferential taper surface 8 b of the cap member 5 and the front end surface 8 c of the body 4, and the gas sensor 3 is fixed to the casing 2.
次に、図５に示すように、ヘッド部３３のセンサ保持孔３３ｃの先端部に円形状のフィルタ部材Ｆを嵌め込む。そして、フィルタ部材Ｆが外れないように、ヘッド部３３の先端部に設けられたおねじ３３１にフィルタ取付リング９を螺着する。 Next, as shown in FIG. 5, the circular filter member F is fitted into the tip portion of the sensor holding hole 33 c of the head portion 33. Then, the filter attachment ring 9 is screwed onto the male screw 331 provided at the tip of the head portion 33 so that the filter member F does not come off.
このような構成であれば、ケーシング２を組み立てるべくキャップ部材５をボディ４に螺合・締結するだけで、ガスセンサ３をケーシング２内に固定できるので、従来のように複数のビスを用いてガスセンサ３を取り付けるのと比べ、ガスセンサ３の交換や組み立ての作業性が大幅に向上する。この効果は、船舶の排気管などのように、作業性が悪い場合に特に顕著となる。 With such a configuration, the gas sensor 3 can be fixed in the casing 2 simply by screwing and fastening the cap member 5 to the body 4 in order to assemble the casing 2. Compared with mounting 3, the workability of replacement and assembly of the gas sensor 3 is greatly improved. This effect is particularly remarkable when workability is poor, such as an exhaust pipe of a ship.
また、キャップ部材５という単一の比較的大型な部品をボディ４に螺合させる構造であるため、船舶の排気管で生じるような高温での焼付も起こりにくいし、ビスなどを用いないので、そのネジ頭に煤が溜まって外せなくなるといった不具合も生じ得ない。 In addition, since the cap member 5 has a structure in which a single relatively large part is screwed into the body 4, it is difficult to cause seizure at a high temperature as occurs in an exhaust pipe of a ship, and no screws are used. There is no possibility that a flaw accumulates on the screw head and cannot be removed.
また、キャップ部材５とボディ４とが同一外径であり、その外側周面が面一となるように構成されているため、排気管への取り付けや取り外しの際に、ケーシング２が引っ掛かるといった不具合を回避できるし、煤が多く溜まるような箇所を減らすこともできる。
さらに、テーパ面８ａ、８ｂによってガスセンサ３が半径方向にも位置決めできるという効果をも得られる。
加えて、この実施形態では、ボディ４からヘッド部３３内を通じてパージエアや校正ガスをガスセンサ３に送り込むことが可能なガス導入経路Ｌ１、Ｌ２を設けており、突出管Ｌ２ａをガス導入経路Ｌ１に挿入するため、ガスセンサ３が回転することが不可能であるが、ガスセンサ３の固定にあたって、キャップ部材５が回転するだけで、ガスセンサ３自身が回転する必要のない構成になっており、ケーブルＣが捻れたりすることも防止できる。
In addition, since the cap member 5 and the body 4 have the same outer diameter and the outer peripheral surface thereof is flush with each other, the casing 2 is caught when being attached to or removed from the exhaust pipe. Can be avoided, and it is possible to reduce places where a lot of soot accumulates.
Furthermore, the effect that the gas sensor 3 can be positioned in the radial direction by the tapered surfaces 8a and 8b is also obtained.
In addition, in this embodiment, there are provided gas introduction paths L1 and L2 through which purge air and calibration gas can be fed into the gas sensor 3 from the body 4 through the head portion 33, and the protruding pipe L2a is inserted into the gas introduction path L1. Therefore, the gas sensor 3 cannot be rotated. However, when the gas sensor 3 is fixed, the cap member 5 only rotates and the gas sensor 3 itself does not need to rotate, and the cable C is twisted. Can also be prevented.
なお、本発明は前記実施形態に限られるものではない。
例えばテーパ面を必ずしも設ける必要はないし、テーパ面を設ける場合であってもその箇所は、キャップ部材及びボディとガスセンサとの当たり面であれば、どこに設けても構わない。例えばボディとガスセンサとの当たり面にテーパ面を設けても良い。また当たり面の双方をテーパ面にすることなく、一方のみにテーパ面を形成しても良い。
The present invention is not limited to the above embodiment.
For example, it is not always necessary to provide the tapered surface, and even when the tapered surface is provided, the location may be provided anywhere as long as it is a contact surface between the cap member and the body and the gas sensor. For example, a tapered surface may be provided on the contact surface between the body and the gas sensor. Moreover, you may form a taper surface in only one side, without making both contact surfaces into a taper surface.
前記実施形態では、キャップ部材がボディの先端部外周面に外嵌して螺合するように構成していたが、ボディが、キャップ部材の基端部外周面に外嵌するような構成でも良い。 In the above-described embodiment, the cap member is configured to be externally fitted and screwed to the outer peripheral surface of the distal end portion of the body. However, the configuration may be such that the body is externally fitted to the outer peripheral surface of the base end portion of the cap member. .
また、図示していないが、ボディの外管と内管との間の空間に外気を導入可能な構成にし、断熱効果に加えて冷却効果を図ることもできる。
その他、本発明は、前記実施形態に限られることなく、その趣旨を逸脱しない範囲で種々の変形が可能である。
Moreover, although not shown in figure, it can also be set as the structure which can introduce external air into the space between the outer tube | pipe and inner tube | pipe of a body, and it can also aim at the cooling effect in addition to the heat insulation effect.
In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
１００…排ガス分析装置
３…ガスセンサ
４ｂ…挿入口
４…ボディ
５…キャップ部材
２…ケーシング
３２…センサ本体
３３…ヘッド部
８ａ、８ｂ…テーパ面
５１ｃ…キャップ部材の外側周面
４ｃ…ボディの外側周面
DESCRIPTION OF SYMBOLS 100 ... Exhaust gas analyzer 3 ... Gas sensor 4b ... Insertion port 4 ... Body 5 ... Cap member 2 ... Casing 32 ... Sensor main body 33 ... Head part 8a, 8b ... Tapered surface 51c ... Outer peripheral surface of cap member 4c ... Outer periphery of body surface
Claims (4)
前記排ガス中の所定成分を検知するガスセンサと、前記ガスセンサを内部に収容するケーシングとを具備し、
前記ケーシングが、ボディ及びこのボディに螺合して取り付けられるキャップ部材から構成されるものであり、前記キャップ部材をボディに螺合締結することにより前記ガスセンサがキャップ部材及びボディに挟み込まれてケーシング内に固定されるように構成してあることを特徴とする排ガス分析装置。 The exhaust gas inserted into the exhaust pipe and flowing through the exhaust pipe is analyzed,
A gas sensor that detects a predetermined component in the exhaust gas, and a casing that houses the gas sensor therein;
The casing includes a body and a cap member that is screwed onto the body, and the gas sensor is sandwiched between the cap member and the body by screwing and fastening the cap member to the body. An exhaust gas analyzer characterized in that the exhaust gas analyzer is fixed to the exhaust gas.
前記キャップ部材が、前記ボディと略同一の外径を有する概略円筒状をなし、ボディの先端部に螺合締結されて、その外側周面がボディの外側周面とが略面一となるように構成したものである請求項１乃至３いずれか記載の排ガス分析装置。 The body has a substantially cylindrical shape in which an insertion port for inserting the gas sensor is formed at a tip portion thereof;
The cap member has a substantially cylindrical shape having substantially the same outer diameter as the body, and is screwed and fastened to the tip of the body so that the outer peripheral surface thereof is substantially flush with the outer peripheral surface of the body. The exhaust gas analyzer according to any one of claims 1 to 3, wherein the exhaust gas analyzer is configured as described above.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012092494A JP2013221805A (en) | 2012-04-13 | 2012-04-13 | Exhaust gas analyzer and probe unit |
| KR1020130015248A KR20130116168A (en) | 2012-04-13 | 2013-02-13 | Exhaust gas analyzer and probe unit |
| CN2013100792114A CN103376306A (en) | 2012-04-13 | 2013-03-13 | Exhaust gas analyzer and probe unit |
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| CN103376306A (en) | 2013-10-30 |
| KR20130116168A (en) | 2013-10-23 |
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