JPS62285032A - Road gas detector - Google Patents
Road gas detectorInfo
- Publication number
- JPS62285032A JPS62285032A JP12981586A JP12981586A JPS62285032A JP S62285032 A JPS62285032 A JP S62285032A JP 12981586 A JP12981586 A JP 12981586A JP 12981586 A JP12981586 A JP 12981586A JP S62285032 A JPS62285032 A JP S62285032A
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- vehicle
- gas
- cylinder
- road
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 32
- 238000007689 inspection Methods 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 25
- 239000004065 semiconductor Substances 0.000 abstract description 19
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 5
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 4
- 150000004706 metal oxides Chemical class 0.000 abstract description 4
- 238000005245 sintering Methods 0.000 abstract description 2
- 238000013459 approach Methods 0.000 abstract 1
- 238000011109 contamination Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 71
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910002090 carbon oxide Inorganic materials 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
（産業上の利用分野〕
本発明は、道路における被検ガスを検知するための装置
に関する。Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a device for detecting a test gas on a road.
都市やその近郊においては、道路等の下に都市ガス用ガ
ス管が埋設されており、漏洩ガスの有無を調べることは
ガス事業者の責務となっている。In cities and their suburbs, city gas pipes are buried under roads, etc., and it is the responsibility of gas utilities to check for leakage of gas.
このため、ガス事業者は前記ガス管からのガス漏れの調
査を積極的に行っている。ところで、ガス漏れ検知を行
うべく用いられる従来のガス漏れ検知装置としては、人
が携帯して用いる水素炎イオン化検知器や歩行式カート
に前記検知器を搭載したものやガス漏れ検知専用車に前
記検知器を搭載したもの等が知られているが、これらは
いずれも、被検ガスを吸引した！―でチェツクする吸引
式のガス漏れ検知装置であった。For this reason, gas utilities are actively investigating gas leaks from the gas pipes. By the way, conventional gas leak detection devices used to detect gas leaks include a hydrogen flame ionization detector carried by a person, a pedestrian cart equipped with the detector, and a gas leak detection vehicle equipped with the detector. Some devices are known to be equipped with a detector, but all of these devices can inhale the gas being tested! It was a suction-type gas leak detection device that checked with -.
これは、漏洩ガスを検知するためには被検ガスを積極的
に吸引することによって確実に捕集する必要があると考
えられていたからであった。This was because it was thought that in order to detect leaked gas, it was necessary to reliably collect the gas to be detected by actively suctioning it.
かかる吸引式のガス漏れ検知装置は、吸引用のポンプが
必要であること、燃料としての水素を貯留するボンベが
必要となること等の事由から大掛かりな装置となる上、
検知技術、維持管理にある程度の熟練を要して通常は熟
練作業者が必要となるので、その装置を用いてガス漏れ
検知を行う場合は、コスト高も考慮すると、多くの車両
で多頻度の検知を行うことは難しかった。また、前記従
来の吸引式のガス漏れ検知装置によるバッチ型の検知を
行う場合は、吸引口に設けられるフィルタを絶えず点検
する必要がある９と、被検ガスの吸引から検知結果が判
明するまでに所定のデッドタイムが生じる等の欠点があ
った。Such a suction-type gas leak detection device is a large-scale device because it requires a pump for suction and a cylinder to store hydrogen as fuel.
Detection technology and maintenance require a certain degree of skill and usually require skilled workers, so when using this device to detect gas leaks, taking into account the high cost, many vehicles require frequent use. Detection was difficult to perform. In addition, when performing batch-type detection using the conventional suction-type gas leak detection device, it is necessary to constantly inspect the filter provided at the suction port 9, and from the time when the test gas is sucked until the detection result is determined. This method has disadvantages such as a certain dead time.
ところで、本発明者等は、ガス漏れ状況の細かい観察の
結果、道路等の下に埋設されたガス管から漏れた都市ガ
スが路面上に至った場合、その都市ガスが、空気よりも
軽くて一ト昇しようとする性質があるにも拘らず、無風
でない限り、路面に近接した領域（具体的には路面上約
２０ｃｍ以内の領域）に一時的に滞留する傾向にあるこ
とを知見した。By the way, as a result of detailed observation of gas leakage conditions, the present inventors have found that when city gas leaks from gas pipes buried under roads, etc. and reaches the road surface, the city gas is lighter than air. It has been found that, despite its tendency to rise, unless there is no wind, it tends to temporarily stay in an area close to the road surface (specifically, within about 20 cm above the road surface).
また、近年のセンサ技術の革新により、非吸引式（換言
すれば拡散式）にて検知することが可能であって高感度
にて検知することも可能なセンサとして、例えば、第７
図に示すような熱線型半導体式センサ（１０）が開発さ
れている。即ち、基台（１１）に植立された一対の支持
棒（１２）。In addition, due to recent innovations in sensor technology, sensors that can detect in a non-suction type (in other words, a diffusion type) and can also detect with high sensitivity, for example,
A hot wire type semiconductor sensor (10) as shown in the figure has been developed. That is, a pair of support rods (12) planted on a base (11).
（１２）の間に白金線コイル（１３）の両端を溶接し、
白金線のコイル部分を埋設して金属酸化物半導体を取り
付けたものである。このセンサは第８図に示すように、
通常ホイートストーンブリッジ回路に組み込まれて使用
される。コイルに流れる電流によって約３００℃〜４５
０℃に保たれた金属酸化物半導体が可燃性ガスを吸着す
ることによる半導体自体の熱伝導、電気伝導の効果によ
り、白金線コイルと半導体との合成抵抗値が減少する。Weld both ends of the platinum wire coil (13) between (12),
The platinum wire coil portion is buried and a metal oxide semiconductor is attached. This sensor, as shown in Figure 8,
Usually used in a Wheatstone bridge circuit. Approximately 300℃~45℃ depending on the current flowing through the coil
The combined resistance value of the platinum wire coil and the semiconductor decreases due to the heat conduction and electric conduction effects of the semiconductor itself due to the metal oxide semiconductor maintained at 0° C. adsorbing combustible gas.
つまり、第８図において、コイル両端（Ｘ） 、 （Ｙ
）間の抵抗値がガス吸着によって減少する。この変化を
ブリッジ回路の偏差電圧として取り出すのである。この
熱線型半導体式センサは小型軽量であり、消費電力が少
なくてすみ、高感度である。例えば、数１０ｐｐＩＩｌ
ｆ１度のメタンガスの検出も可能である。他の半導体式
センサと比較して、初期安定時間が短いのが特徴で、ガ
ス微量漏洩検知、雰囲気検知に最適である。In other words, in Fig. 8, both ends of the coil (X), (Y
) decreases due to gas adsorption. This change is extracted as the deviation voltage of the bridge circuit. This hot-wire semiconductor sensor is small and lightweight, consumes little power, and has high sensitivity. For example, several tens of ppIIl
It is also possible to detect methane gas at f1 degrees. Compared to other semiconductor sensors, it has a short initial stabilization time, making it ideal for detecting small amounts of gas leaks and detecting atmospheres.
耐振性があるので、車載用に使用しても有効である。第
９図は熱線型半導体式センサの出力特性図である。メタ
ン、水素、エタノール、トルエン、−酸化炭素の各ガス
の各濃度におけるセンサ出力値を−Ｖで表示しである。Since it is vibration resistant, it is also effective for use in vehicles. FIG. 9 is an output characteristic diagram of the hot wire type semiconductor sensor. The sensor output value at each concentration of each gas of methane, hydrogen, ethanol, toluene, and -carbon oxide is indicated by -V.
更には、路上には営業やサービス業務等を行うのに用い
るガス業者所有の乗用車が数多く走行しているという事
実もある。Furthermore, there are many passenger cars owned by gas companies that are used for sales and service operations on the roads.
本発明は、前述した如き本発明者等の知見に基づいた上
、前述した如く近年著しく進歩したセンサ技術、及び、
上述した如く数多く路上走行する乗用車等の車両を利用
することによって創案されたものであり、その目的とす
るところは、例えば、道路等の下に埋設されたガス管か
らのガス漏れを可及的に高頻度にて検知し得るガス漏れ
検知装置等のガス検知装置を提供する点にある。The present invention is based on the knowledge of the present inventors as described above, and utilizes sensor technology that has made significant progress in recent years as described above, and
As mentioned above, it was invented by using vehicles such as passenger cars that travel in large numbers on the road, and its purpose is, for example, to prevent gas leaks from gas pipes buried under roads, etc. An object of the present invention is to provide a gas detection device such as a gas leak detection device that can detect gas leaks at high frequency.
本発明に係る路上ガス検知装置は、路上走行する車両に
その下部を通過する空気に対する検査機構を設けてある
点に特徴を有している。The road gas detection device according to the present invention is characterized in that a vehicle running on the road is provided with an inspection mechanism for air passing under the vehicle.
本発明の路上ガス検知装置にあっては、路上走行する車
両にその下部を通過する空気に対する検査機構を設けて
あるので、そのセンサによって、被検ガス、例えば埋設
されたガス管から漏れて上述したように路面に近接した
領域に空気よりも軽いガスにも拘らず風によって一時的
に地表面付近に滞留する都市ガス等の被検ガスを検査す
ることができる。In the road gas detection device of the present invention, since a vehicle running on the road is provided with an inspection mechanism for the air passing under the vehicle, the sensor detects the gas to be detected, for example, leaking from a buried gas pipe and detecting the above-mentioned gas. As described above, it is possible to test gases such as city gas, which are lighter than air and temporarily remain near the ground surface due to the wind, in areas close to the road surface.
しかも、本発明の路上ガス検知装置を用いる場合は、前
記センサとして例えばメタン選択性熱線型半導体式セン
サを用いることにより、被検ガスを吸引することなく直
接的に検知することができ、拡散方式にて検知すること
ができるので、従来の検知装置即ち吸引方式の検知装置
を用いる場合と異なり、低コストかつ能率的な検知が可
能となる。Furthermore, when using the roadside gas detection device of the present invention, by using a methane-selective hot-wire type semiconductor sensor as the sensor, the gas to be detected can be directly detected without being sucked. Unlike the case of using a conventional detection device, that is, a suction type detection device, low-cost and efficient detection is possible.
そこで、ガス漏れ検知作業用の車両のみならず、ガス漏
れ検知作業とは別目的の作業を行うための車両（例えば
営業やサービス業務等を行うのに用いる乗用車）に対し
ても可及的に数多く前記センサを上述の如く設けること
によって数多くの本発明の検知装置を構成し、運転者に
は負担のかからない手段（例えば、警報音等にて運転者
に知らせる手段）にてガス漏れの存在を運転者に知らせ
るような工夫をこらすことにより、ガス漏れ検知を可及
的に高頻度にて行うことができるようになり、従来より
も早期にガス漏れを発見することができるようになる。Therefore, it is recommended not only for vehicles used for gas leak detection work, but also for vehicles used for work other than gas leak detection work (for example, passenger cars used for sales and service work, etc.). By providing a large number of the sensors as described above, a large number of detection devices of the present invention can be configured, and the presence of a gas leak can be detected by means that do not burden the driver (for example, by notifying the driver with an alarm sound, etc.). By taking measures to notify the driver, gas leak detection can be performed as frequently as possible, making it possible to discover gas leaks earlier than before.
従って、本発明の検知装置を用いる場合は、ガス漏れの
一層の早期発見を実現するこができる。Therefore, when using the detection device of the present invention, gas leakage can be detected even earlier.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図及び第２図において、（１）は路面（Ａ）上を走
行する営業用乗用車等の車両であり、その車両（１）に
は、その下部を通過する空気に対する検査機構（２）を
設けてある。In Figures 1 and 2, (1) is a vehicle such as a commercial passenger car that runs on the road surface (A), and the vehicle (1) has an inspection mechanism (2) for the air passing under the vehicle. is provided.
具体的には、第３図及び第４図に示す如く、前記車両（
１）の前面最下部に装着されているスカート部材（ｌａ
） （例えば、バンパの下に取着されているパンパスト
ーンデフレクタ）に垂設された吊支部材（２４）によっ
て支持され、前記車両（１）の進行方向と筒軸を一致さ
せるように配置された円筒状の被検ガス通流筒体（２５
）の中央側部に筒軸と直交するように穿設した横孔（２
５ａ）に対し、白金線コイルに金属酸化物半導体を塗布
し焼結することによって高感度のメタン選択性熱線型半
導体式のセンサ本体（２３ａ） （第７図において説明
したセンサ（１０）に相当）を構成した前記センサ（２
３）が、その前面を前記筒体（２５）内に向けた状態で
、かつ、その前面に異物混入防止用の金ｍ （２３ｂ）
を装着した状態で取着され、もって、前記センサ（２３
）を前記筒体（２５）を介して前記路面（Ａ）に近接す
るような状態に取着しである。なお、前記センサ（２３
）は、前記車両（１）が日本のように路面（八）上を左
側通行する場合に前記センサ（２３）を路面（Ａ）の路
肩（Ｒ）側に位置させるように、車両（１）の進行方向
に向かって左側寄りに設けられている。また、前記被検
ガス通流筒体（２５）の空気取入口（２５ｈ）は、前方
側はど拡径した前拡がり形状とされており、被検ガスが
前記筒体（２５）内を通過し易くなるように配慮されて
いる。また、その空気取入口（２５ｂ）も異物混入防止
用の金網（２５ｃ）が装着されている。Specifically, as shown in FIGS. 3 and 4, the vehicle (
1) The skirt member (la
) (for example, a pampa stone deflector attached under the bumper), supported by a hanging support member (24) vertically installed, and arranged so that the traveling direction of the vehicle (1) coincides with the cylinder axis. A cylindrical gas flow cylinder body (25
) is drilled perpendicularly to the cylinder axis in the center side (2
In contrast to 5a), a highly sensitive methane-selective hot-wire semiconductor type sensor body (23a) (corresponding to the sensor (10) explained in Fig. 7) is created by coating a platinum wire coil with a metal oxide semiconductor and sintering it. ) The sensor (2
3) is in a state where its front face is directed into the cylindrical body (25), and there is a gold m (23b) on the front face to prevent foreign matter from entering.
is attached with the sensor (23
) is attached in close proximity to the road surface (A) via the cylindrical body (25). Note that the sensor (23
) is arranged so that when the vehicle (1) drives on the left side on the road surface (8) as in Japan, the sensor (23) is located on the shoulder (R) side of the road surface (A). It is located on the left side when facing the direction of travel. Further, the air intake port (25h) of the test gas flow cylinder (25) has a front-widening shape with an enlarged diameter at the front side, so that the test gas passes through the inside of the cylinder (25). It is designed to be easy to use. Further, the air intake port (25b) is also fitted with a wire mesh (25c) to prevent foreign matter from entering.
なお、前記メタン選択性熱線型半導体式センサとしては
、前記熱線型半導体式センサを改良し、メタン選択性を
持たせるものがよい（特願昭５７−２２７５６７号公報
）。このセンサを用いれば、自動車排ガス中の水素、−
酸化炭素ガス等の影響を受けることもなく、都市ガス中
のメタンガスを検出することができる。第５図はメタン
選択性熱線型半導体式センサの出力特性図である。The methane-selective hot-wire type semiconductor sensor is preferably one that improves the hot-wire type semiconductor sensor to have methane selectivity (Japanese Patent Application No. 57-227567). Using this sensor, hydrogen in automobile exhaust gas, -
Methane gas in city gas can be detected without being affected by carbon oxide gas, etc. FIG. 5 is an output characteristic diagram of the methane-selective hot wire type semiconductor sensor.
メタン、−酸化炭素、水素、エタノール、トルエンの各
ガス濃度におけるセンサ出力をｍＶで表示している。こ
の出力特性図より、メタンガスが他の一酸化炭素、水素
、エタノール、トルエンの各ガスに比較して著しく選択
性を有していることがわかる。The sensor output at each gas concentration of methane, -carbon oxide, hydrogen, ethanol, and toluene is displayed in mV. This output characteristic diagram shows that methane gas has remarkable selectivity compared to other gases such as carbon monoxide, hydrogen, ethanol, and toluene.
そして、前記センサ（２３）による検知結果を表示する
表示部（２６）が、車両（１）の運転席（１ｂ）の前面
下方に装着されているが、その表示部（２６）は前記検
知結果を数値表示すると共にその数値が所定値（ガス漏
れ状態と認定すべき値）以上になった場合には警報音を
発生するようになっている。A display section (26) for displaying the detection results by the sensor (23) is mounted below the front of the driver's seat (1b) of the vehicle (1). is displayed numerically, and if the numerical value exceeds a predetermined value (a value that should be recognized as a gas leak state), an alarm sound is generated.
なお、前記センサ（２３）や前記表示部（２６）等から
なる検査機構（２）を作動状態となす電源は、車両（１
）のエンジン始動と同時に入るようになっている。The power source for activating the inspection mechanism (2), which includes the sensor (23), the display section (26), etc., is connected to the vehicle (1).
) is designed to turn on at the same time as the engine starts.
かかる構成の検知装置にあっては、車両（１）の下部に
ガス漏れを検知するセンサ（２３）を路面（Ａ）に近接
状態となるように設けてあるので、そのセンサ（２３）
によって、路面（八）下に埋設されたガス管から漏れて
上述したように路面（八）に近接した領域（Ｃ）に滞留
する都市ガスを、車両（１）に運転中にその運転者が負
担をかけることなく、絶えず検知することができる。In the detection device having such a configuration, the sensor (23) for detecting gas leakage is provided in the lower part of the vehicle (1) so as to be close to the road surface (A).
Therefore, while driving the vehicle (1), the driver leaks city gas from the gas pipe buried under the road surface (8) and accumulates in the area (C) close to the road surface (8) as described above. Continuous detection can be performed without any burden.
なお、本実施例において、センサ（２３）を車両（１）
の進行方向に向かって左側寄りに設けてあるのは、路面
（＾）下に埋設されたガス管からガス漏れが生じた場合
、路面（八）と路肩（Ｒ）との境界から漏洩ガスが空中
へ拡散される蓋然性が高いので、そのガス漏れの検知精
度を少しでも向上させる上で望ましいためである。そし
て、路面（＾）に大きなキャンバがついている場合は、
路面（Ａ）の路肩（Ｂ）側に漏洩ガスが滞留し易いため
である。In this embodiment, the sensor (23) is connected to the vehicle (1).
The one located on the left side in the direction of travel is located to prevent gas from leaking from the boundary between the road surface (8) and the road shoulder (R) in the event that gas leaks from the gas pipe buried under the road surface (^). This is because there is a high probability that the gas will be diffused into the air, so it is desirable to improve the accuracy of detecting gas leaks even a little. And if the road surface (^) has a large camber,
This is because leaked gas tends to accumulate on the shoulder (B) side of the road surface (A).
また、本実施例においては、センサ（２３）が金網（２
５ｃ）及び金１４（２３ｂ）によって二重に異物混入防
止対策が講じられ保護されているので、そのセンサ（２
３）は、路面（＾）に近接するような状態とされている
にも拘らず、損傷・破損といった事態には至ることはな
い。Further, in this embodiment, the sensor (23) is connected to the wire mesh (2
5c) and gold 14 (23b), the sensor (2
3) is in a state where it is close to the road surface (^), but no damage or breakage occurs.
前記センサ（２３）は、路上走行する乗用車以外の車両
、例えば自転車やオートバイ等に設けてもよいのはいう
までもない。It goes without saying that the sensor (23) may be provided in a vehicle other than a passenger car that runs on the road, such as a bicycle or a motorcycle.
また、上述の実施例においては、被検ガス通流筒体（２
５）として円筒状のものを用いることとしたが、第６図
に示すように円筒状のものよりも幅の広い扁平円筒状の
もの等、種々の形態のものが考えられる。扁平円筒状の
ものを用いる場合は、被検ガスを幅広く集めてその筒体
（２５）内を通流させることができる。In addition, in the above-mentioned embodiment, the gas flow cylinder to be detected (2
As for 5), a cylindrical shape was used, but various shapes such as a flat cylindrical shape with a wider width than a cylindrical shape as shown in FIG. 6 are possible. When a flat cylindrical tube is used, the gas to be detected can be collected in a wide range and passed through the tube (25).
なお、特許請求の範囲の項に図面との対照を便利にする
ために符号を記すが、その記入により本発明は添付図面
の構造に限定されるものではない。Note that although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.
第１図は本発明に係る路上ガス検知装置の実施例を示す
側面図、第２図はその正面図、第３図はその要部を示す
正面図、第４図は第３図のｒＶ−ｒＶ線による断面図、
第５図は前記装置に用いるメタン選択性熱線型半導体式
センサの出力特性例を示すグラフ、第６図は別実施例の
検査機構の要部正面図、第７図は熱線型半導体式センサ
を示す説明図、第８図はそのセンサを組み込んだ基本回
路図、第９図はその熱線型半導体式センサの出力特性例
を示すグラフである。
（１）・・・・・・車両、（２）・・・・・・検査機構
。Fig. 1 is a side view showing an embodiment of the road gas detection device according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a front view showing the main parts thereof, and Fig. 4 is a rV- Cross-sectional view along rV line,
FIG. 5 is a graph showing an example of the output characteristics of the methane-selective hot-wire type semiconductor sensor used in the device, FIG. 6 is a front view of the main parts of the inspection mechanism of another embodiment, and FIG. 7 is a graph showing the output characteristics of the methane-selective hot-wire semiconductor sensor FIG. 8 is a basic circuit diagram incorporating the sensor, and FIG. 9 is a graph showing an example of the output characteristics of the hot wire type semiconductor sensor. (1)...Vehicle, (2)...Inspection mechanism.
Claims (1)
気に対する検査機構（２）を設けてあることを特徴とす
る路上ガス検知装置。 ［２］前記検査機構（２）の空気取入口（２５ｂ）を車
両（１）の下部に設けてある特許請求の範囲第［１］項
に記載の路上ガス検知装置。 ［３］前記車両（１）下部に設けた空気取入口（２５ｂ
）を車両（１）の前方に位置させてある特許請求の範囲
第［２］項に記載の路上ガス検知装置。 ［４］前記空気取入口（２５ｂ）を前拡がり形状として
ある特許請求の範囲第［２］項に記載の路上ガス検知装
置。 ［５］前記検査機構（２）の空気取入口（２５ｂ）から
取り入れられた空気を検査するセンサ（２３）自体も車
両（１）の下部に設けてある特許請求の範囲第［２］項
に記載の路上ガス検知装置。 ［６］前記車両（１）下部に設けたセンサ（２３）自体
を車両（１）の前方に位置させてある特許請求の範囲第
［５］項に記載の路上ガス検知装置。[Scope of Claims] [1] A road gas detection device characterized in that a vehicle (1) running on the road is provided with an inspection mechanism (2) for air passing under the vehicle. [2] The road gas detection device according to claim 1, wherein the air intake port (25b) of the inspection mechanism (2) is provided at a lower part of the vehicle (1). [3] Air intake port (25b) provided at the bottom of the vehicle (1)
) is located in front of the vehicle (1). The road gas detection device according to claim 2. [4] The road gas detection device according to claim [2], wherein the air intake port (25b) has a shape that widens forward. [5] According to claim [2], the sensor (23) itself that inspects the air taken in from the air intake port (25b) of the inspection mechanism (2) is also provided at the lower part of the vehicle (1). The roadside gas detection device described. [6] The road gas detection device according to claim [5], wherein the sensor (23) itself provided at the lower part of the vehicle (1) is located in front of the vehicle (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12981586A JPS62285032A (en) | 1986-06-04 | 1986-06-04 | Road gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12981586A JPS62285032A (en) | 1986-06-04 | 1986-06-04 | Road gas detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62285032A true JPS62285032A (en) | 1987-12-10 |
| JPH0584455B2 JPH0584455B2 (en) | 1993-12-02 |
Family
ID=15018904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12981586A Granted JPS62285032A (en) | 1986-06-04 | 1986-06-04 | Road gas detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62285032A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11268472B2 (en) | 2017-02-24 | 2022-03-08 | Carrier Corporation | Methane safety systems for transport refrigeration units |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3107517A (en) * | 1960-05-31 | 1963-10-22 | Rayflex Exploration Company | Natural gas leak detection |
| JPS494391U (en) * | 1972-04-14 | 1974-01-15 |
-
1986
- 1986-06-04 JP JP12981586A patent/JPS62285032A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3107517A (en) * | 1960-05-31 | 1963-10-22 | Rayflex Exploration Company | Natural gas leak detection |
| JPS494391U (en) * | 1972-04-14 | 1974-01-15 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11268472B2 (en) | 2017-02-24 | 2022-03-08 | Carrier Corporation | Methane safety systems for transport refrigeration units |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0584455B2 (en) | 1993-12-02 |
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