JPH0435796Y2 - - Google Patents
Info
- Publication number
- JPH0435796Y2 JPH0435796Y2 JP310486U JP310486U JPH0435796Y2 JP H0435796 Y2 JPH0435796 Y2 JP H0435796Y2 JP 310486 U JP310486 U JP 310486U JP 310486 U JP310486 U JP 310486U JP H0435796 Y2 JPH0435796 Y2 JP H0435796Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- casing
- light receiving
- heater
- exhaust pipe
- 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
- 239000000779 smoke Substances 0.000 claims description 25
- 230000003287 optical effect Effects 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 8
- 239000011810 insulating material Substances 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Landscapes
- Optical Measuring Cells (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は内燃機関の排気ガスのスモーク濃度を
測定するための、光学式スモーク濃度センサを用
いたスモーク濃度検出装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a smoke concentration detection device using an optical smoke concentration sensor for measuring the smoke concentration of exhaust gas of an internal combustion engine.
従来、煙道中の煤煙の濃度を検出するため、投
光器と受光器をパイプで連結してこのパイプを煙
道内に設置し、パイプにはその一部に煤煙の通る
切開部を設け、ばい煙がこの切開部を通過する
際、その煤煙濃度により受光量の変化するのを検
出するようにした光学式スモーク濃度検出装置が
知られている（特公昭52−47344号公報参照）。
Conventionally, in order to detect the concentration of soot and smoke in a flue, a projector and a receiver were connected with a pipe, and this pipe was installed in the flue.The pipe had an incision in a part of it through which soot and smoke could pass. An optical smoke density detection device is known that detects changes in the amount of light received depending on the soot density when passing through an incision (see Japanese Patent Publication No. 47344/1983).
また上記のような光学式スモーク濃度センサに
おいて、その中を排気ガスが流れることにより投
光部及び受光部に付着するデポジツトを除去する
ため、これら投光部及び受光部の周囲に焼却用ヒ
ータを取付けたものもある（特願昭59−269624
号）。 In addition, in the optical smoke density sensor as described above, in order to remove deposits that adhere to the light emitting part and the light receiving part due to the exhaust gas flowing through it, an incineration heater is installed around the light emitting part and the light receiving part. Some have been installed (patent application 1986-269624)
issue).
上記の、投光部及び受光部に付着したデポジツ
トを除去するための焼却用ヒータを取付けた光学
式スモーク濃度センサにおいては、このヒータは
投光部及び受光部の光路断面の周囲を環状に取巻
くように装着されているが、投光部及び受光部を
取付けるべきケーシングがステンレス鋼等の熱伝
導の良好な材料で作られているため、このケーシ
ングがヒータ部に接触してヒータの熱を逃がし、
そのため投光部及び受光部への熱の伝導が不十分
となり、付着したデポジツトを所期のとおりに焼
却できないという問題がある。
In the optical smoke concentration sensor described above, which is equipped with an incineration heater for removing deposits attached to the light emitter and light receiver, this heater is arranged in an annular manner around the optical path cross section of the light emitter and light receiver. However, since the casing to which the emitter and receiver are attached is made of a material with good thermal conductivity such as stainless steel, this casing comes into contact with the heater and dissipates the heat from the heater. ,
As a result, there is a problem in that heat conduction to the light projecting section and the light receiving section is insufficient, and the attached deposits cannot be incinerated as expected.
本考案は光学式スモーク濃度センサにおいてそ
の投光部及び受光部に付着したデポジツトを効率
的に焼却することができ、またデポジツト焼却用
ヒータの耐久性を向上させ、さらにセンサ取付け
後のスモーク濃度検出装置全体の強度を増大させ
ようとするものである。 This invention can efficiently incinerate deposits attached to the light emitting part and light receiving part of an optical smoke density sensor, improve the durability of the deposit incineration heater, and further improve the smoke density detection after the sensor is installed. The purpose is to increase the strength of the entire device.
上記の問題点を解決するため、本考案によれば
単一のケーシングの両端から、投光部と受光部と
をそれぞれ挿入装着し、前記ケーシングの前記投
光部と受光部との間の部分に排気ガスの通過する
窓孔を設け、前記投光部と受光部の周囲には付着
デポジツトを焼却するためのヒータをそれぞれ取
付け、これら各ヒータの周囲を断熱材で被覆して
前記ケーシングの内壁に固定し、このように構成
された光学式スモーク濃度センサを、測定すべき
排気ガスの通過する排気管に、これを横断貫通し
て取付けたスモーク濃度検出装置が提供される。
In order to solve the above problems, according to the present invention, a light emitting part and a light receiving part are inserted and mounted from both ends of a single casing, and a portion of the casing between the light emitting part and the light receiving part is mounted. A window hole through which exhaust gas passes is provided in the casing, heaters are installed around the light emitting part and the light receiving part to incinerate deposits, and the inner wall of the casing is coated with a heat insulating material around each of these heaters. A smoke concentration detection device is provided in which the optical smoke concentration sensor configured as described above is attached to an exhaust pipe through which exhaust gas to be measured passes through the exhaust pipe.
本考案の実施例を、図面を参照して以下に説明
する。
Embodiments of the present invention will be described below with reference to the drawings.
第１図及び第２図を参照すると、１は送受光ヘ
ツドであつて、この送受光ヘツド１は、例えばア
ルミナ等からなる管状セラミツクで形成されたケ
ーシング２と、このケーシング２の両端から挿入
装着され、石英のような透光材料からなる投光部
３ａ及び受光部３ｂと、これら投光部３ａ及び受
光部３ｂの周囲を取巻く管状のセラミツクヒータ
４ａ及び４ｂとから主として構成されている。 Referring to FIGS. 1 and 2, 1 is a light transmitting/receiving head, and this light transmitting/receiving head 1 has a casing 2 formed of tubular ceramic made of, for example, alumina, and is inserted and mounted from both ends of the casing 2. It mainly consists of a light projecting section 3a and a light receiving section 3b made of a transparent material such as quartz, and tubular ceramic heaters 4a and 4b surrounding the light projecting section 3a and light receiving section 3b.
投光部３ａと受光部３ｂはその軸線を一致させ
てケーシング２の両端から挿入し、投光部３ａ内
を通過した光が投光部３ａと受光部３ｂとの間に
存在する空間６を経て受光部３ｂに達し１本の光
路を形成するようにしている。 The light emitting part 3a and the light receiving part 3b are inserted from both ends of the casing 2 with their axes aligned, and the light passing through the light emitting part 3a fills the space 6 existing between the light emitting part 3a and the light receiving part 3b. The light then reaches the light receiving section 3b to form one optical path.
ケーシング２にはそのほぼ中央部の排気管内の
排気ガスの流れに対面する位置に、この排気ガス
が通過する窓孔２ａ，２ｂを設け、一方の窓孔２
ａからケーシング２内に流れ込んだ排気ガスが前
記光路を横断し他方の窓孔２ａから再び排気管内
に出るようにする。 Window holes 2a and 2b through which the exhaust gas passes are provided in the casing 2 at positions facing the flow of exhaust gas in the exhaust pipe in the approximately central part of the casing 2.
The exhaust gas that has flowed into the casing 2 from the window hole 2a crosses the optical path and exits into the exhaust pipe again from the other window hole 2a.
セラミツクヒータ４ａ，４ｂの発熱部分は、排
気ガスが接触する、投光部３ａの内側端部付近及
び受光部３ｂの内側端部に、それぞれ取付ける。 The heat generating parts of the ceramic heaters 4a and 4b are attached near the inner end of the light projecting part 3a and the inner end of the light receiving part 3b, respectively, with which exhaust gas comes into contact.
また前記各ヒータ４ａ，４ｂの周囲は前記発熱
部に達しない長さの管状のセラミツク５ａ，５ｂ
のような断熱材で被覆し、前記ヒータ４ａ，４ｂ
がこの管状セラミツク５ａ，５ｂを介してケーシ
ング２の内壁に固定され、ケーシング２には直接
接触しないようにしている。 Further, each heater 4a, 4b is surrounded by a tubular ceramic 5a, 5b having a length that does not reach the heat generating part.
The heaters 4a and 4b are covered with a heat insulating material such as
is fixed to the inner wall of the casing 2 via the tubular ceramics 5a, 5b so as not to come into direct contact with the casing 2.
このように形成した送受光ヘツド１を、第３図
に示すように排気管に取付けてスモーク濃度検出
装置を構成する。 The light transmitting/receiving head 1 thus formed is attached to an exhaust pipe as shown in FIG. 3 to constitute a smoke concentration detecting device.
すなわち、送受光ヘツド１を、排気管７に直交
するよう横断貫通して左右に掛け渡しその左右両
端を図示しないボルト・ナツト等で排気管７に固
定する。 That is, the light transmitting/receiving head 1 is passed through the exhaust pipe 7 perpendicularly to the left and right, and its left and right ends are fixed to the exhaust pipe 7 with bolts and nuts (not shown).
送受光ヘツド１は図示しない発光素子（例えば
LED）及び受光素子（例えばフオトダイオード）
を経てコンピユータ８に接続される。 The light transmitting/receiving head 1 includes a light emitting element (not shown) (for example,
LED) and photodetector (e.g. photodiode)
It is connected to the computer 8 via.
上記のように構成されたスモーク濃度検出装置
において、投光部３ａを出た光は光路を直進して
受光部３ｂに達するが、この際ケーシング２の窓
孔２ａを通過し光路を横断する排気管７中の排気
ガスにより受光部３ｂに達する光量が変化する。
投光部３ａ、受光部３ｂで検知された光量を示す
信号がコンピユータ８に送られる。この光量の変
化はスモーク濃度に対応するのでコンピユータ８
は投光部３ａと受光部３ｂで検知された光量を比
較してスモーク濃度を算出する。 In the smoke concentration detection device configured as described above, the light emitted from the light projecting section 3a travels straight along the optical path and reaches the light receiving section 3b, but at this time, the exhaust gas passes through the window hole 2a of the casing 2 and crosses the optical path. The amount of light reaching the light receiving section 3b changes depending on the exhaust gas in the tube 7.
A signal indicating the amount of light detected by the light projecting section 3a and the light receiving section 3b is sent to the computer 8. This change in the amount of light corresponds to the smoke density, so the computer 8
calculates the smoke density by comparing the amounts of light detected by the light projecting section 3a and the light receiving section 3b.
一方、投光部３ａ及び受光部３ｂの光路断面に
付着したスモークによるデポジツトは、これら投
光部及び受光部に接触して取付けられたヒータ４
ａ，４ｂによつて焼却される。この場合ヒータ４
ａ，４ｂの周囲は断熱材である管状セラミツク５
ａ，５ｂで被覆されているので、ヒータ４ａ，４
ｂで発生した熱がケーシング２に伝導されるのが
防止され、そのためヒータ４ａ，４ｂの発熱が有
効に利用できその焼却効果が向上する。これに伴
い通電量も低減されるためヒータ４ａ，４ｂの耐
久性が向上する。 On the other hand, smoke deposits attached to the optical path cross section of the light projecting section 3a and the light receiving section 3b are removed from the heater 4 attached in contact with the light projecting section and the light receiving section.
Incinerated by a and 4b. In this case heater 4
A and 4b are surrounded by tubular ceramic 5 which is a heat insulating material.
Since the heaters 4a and 4b are covered with
The heat generated in step b is prevented from being conducted to the casing 2, so that the heat generated by the heaters 4a and 4b can be used effectively and the incineration effect is improved. Accordingly, the amount of current applied is also reduced, so that the durability of the heaters 4a and 4b is improved.
本考案は以上のような構成を有することによ
り、投光部及び受光部に取付けたヒータの熱効率
が向上し、付着したデポジツトの焼却作用が良好
となり、そのため通電量も低減されヒータの耐久
性も向上する。
By having the above-mentioned configuration of the present invention, the thermal efficiency of the heater attached to the light emitting part and the light receiving part is improved, the incineration effect of attached deposits is improved, the amount of current is reduced, and the durability of the heater is also improved. improves.
またスモーク濃度センサは１本のケーシングの
両端に投光部と受光部とを挿入して装着している
ため両者の軸線方向のずれがなく簡単に組付けが
できる。 Furthermore, since the smoke density sensor is mounted by inserting the light emitting part and the light receiving part into both ends of one casing, there is no misalignment of the two in the axial direction, and the sensor can be easily assembled.
さらにスモーク濃度センサは排気管を横断貫通
して取付けているので、取付後のスモーク濃度検
出装置の全体構造の強度が増し、車両搭載上有利
である。 Furthermore, since the smoke concentration sensor is installed by passing through the exhaust pipe, the strength of the overall structure of the smoke concentration detection device after installation is increased, which is advantageous for mounting on a vehicle.
第１図は本考案の一実施例に用いるスモーク濃
度センサの一部縦断正面図、第２図は同上実施例
の平面図、第３図は同上スモーク濃度センサを取
付けたスモーク濃度検出装置の全体構成図であ
る。
１……送受光ヘツド、２……ケーシング、２ａ
……窓孔、３ａ……投光部、３ｂ……受光部、４
ａ，４ｂ……ヒータ、５ａ，５ｂ……管状セラミ
ツク、７……排気管、８……コンピユータ。
Fig. 1 is a partially longitudinal front view of a smoke concentration sensor used in an embodiment of the present invention, Fig. 2 is a plan view of the same embodiment, and Fig. 3 is an entire smoke density detection device to which the above smoke density sensor is attached. FIG. 1... Light transmitting/receiving head, 2... Casing, 2a
...Window hole, 3a...Light emitter, 3b...Light receiver, 4
a, 4b...Heater, 5a, 5b...Tubular ceramic, 7...Exhaust pipe, 8...Computer.
Claims (1)
光部とをそれぞれ挿入装着し、前記ケーシングの
一部に排気ガスの通過する窓孔を設け、前記投光
部と受光部の周囲には付着デポジツトを焼却する
ヒータをそれぞれ取付け、該各ヒータはその周囲
を断熱材にて被覆して前記ケーシングの内壁に固
定して構成した光学式スモークセンサを、前記排
気ガスの通過する排気管に対しこれを横断貫通し
て該排気管に取付けてなることを特徴とするスモ
ーク濃度検出装置。 A light emitting part and a light receiving part are inserted into a single casing from both ends thereof, a window hole is provided in a part of the casing through which exhaust gas passes, and the area around the light emitting part and light receiving part is covered with gas. A heater for incinerating deposits is installed, and each heater is covered with a heat insulating material and fixed to the inner wall of the casing. An optical smoke sensor is attached to the exhaust pipe through which the exhaust gas passes. A smoke concentration detection device, characterized in that it is attached to the exhaust pipe by passing through the exhaust pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP310486U JPH0435796Y2 (en) | 1986-01-16 | 1986-01-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP310486U JPH0435796Y2 (en) | 1986-01-16 | 1986-01-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62115654U JPS62115654U (en) | 1987-07-23 |
| JPH0435796Y2 true JPH0435796Y2 (en) | 1992-08-25 |
Family
ID=30782556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP310486U Expired JPH0435796Y2 (en) | 1986-01-16 | 1986-01-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0435796Y2 (en) |
-
1986
- 1986-01-16 JP JP310486U patent/JPH0435796Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62115654U (en) | 1987-07-23 |
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