JPH04134062U - alcohol sensor - Google Patents
alcohol sensorInfo
- Publication number
- JPH04134062U JPH04134062U JP4162591U JP4162591U JPH04134062U JP H04134062 U JPH04134062 U JP H04134062U JP 4162591 U JP4162591 U JP 4162591U JP 4162591 U JP4162591 U JP 4162591U JP H04134062 U JPH04134062 U JP H04134062U
- Authority
- JP
- Japan
- Prior art keywords
- center electrode
- protector
- fuel
- peripheral surface
- circumferential surface
- 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
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000000446 fuel Substances 0.000 claims abstract description 40
- 230000001012 protector Effects 0.000 claims abstract description 28
- 230000002093 peripheral effect Effects 0.000 claims abstract description 19
- 150000001298 alcohols Chemical class 0.000 abstract description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 15
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
(57)【要約】
【目的】 アルコールセンサの液密シール構造の改良に
より、出力特性の変化を防止して、正確なアルコール濃
度を検出することを目的とする。
【構成】 プロテクター１７の外周面及び内周面に夫々
筒部２内周面及び中心電極６外周面に接触する環状のリ
ブ部１８，１９を張り出し形成すると共に、該プロテク
ター１７の０リング１０側の端面を凹の曲面２０に形成
する。前記リブ部１８，１９の作用により、確実な液密
シールを行う。プロテクター１７の０リング１０側の凹
の曲面２０からなる端面は平面の場合と比較して、該端
面と０リング１０外周面との間の空間部、即ち、デッド
ボリュームが少なくでき、０リング１０と接触する燃料
の量が少なくなる。
(57) [Summary] [Purpose] The purpose is to prevent changes in output characteristics and accurately detect alcohol concentration by improving the liquid-tight seal structure of an alcohol sensor. [Structure] Annular rib portions 18 and 19 are formed on the outer peripheral surface and inner peripheral surface of the protector 17 to contact the inner peripheral surface of the cylindrical portion 2 and the outer peripheral surface of the center electrode 6, respectively. The end face is formed into a concave curved surface 20. The action of the rib portions 18 and 19 provides a reliable liquid-tight seal. The end face of the protector 17 on the O-ring 10 side, which is a concave curved surface 20, can reduce the space between the end face and the outer peripheral surface of the O-ring 10, that is, the dead volume, compared to a flat end face. The amount of fuel that comes into contact with the
Description
【０００１】0001
本考案は、内燃機関等のアルコールセンサに関し、特に、中心電極の液密シー ル部分の構造の改良を図って、出力特性の安定化を図る技術に関する。 The present invention relates to alcohol sensors for internal combustion engines, etc., and is particularly applicable to liquid-tight seals in the center electrode. This invention relates to a technique for stabilizing output characteristics by improving the structure of the lead portion.
【０００２】0002
近年、自動車用内燃機関の代替燃料としてガソリンにメタノールやエタノール 等のアルコールを混合したアルコール混合燃料が提案されている。 かかるアルコール混合燃料を用いた場合、アルコール濃度に応じて理論空燃比 が変化するため、供給されたアルコール混合燃料のアルコール濃度を検出し、こ のアルコール濃度に基づいて燃料供給量制御や点火時期制御を行う必要がある（ 例えば、特開昭５６−９５８５４０号公報等参照）。 In recent years, methanol and ethanol have been added to gasoline as alternative fuels for automobile internal combustion engines. An alcohol-mixed fuel containing alcohols such as alcohols has been proposed. When using such alcohol mixed fuel, the stoichiometric air-fuel ratio depends on the alcohol concentration. Since the alcohol concentration changes, the alcohol concentration of the supplied alcohol-mixed fuel is detected and It is necessary to control the fuel supply amount and ignition timing based on the alcohol concentration of For example, see Japanese Unexamined Patent Publication No. 56-958540).
【０００３】 そこで、内燃機関の燃料供給通路に、混合燃料中のアルコール濃度に対応する 電圧を出力する静電容量型のアルコールセンサが提案されている。 この静電容量型のアルコールセンサは、従来、図３に示すように構成される。 即ち、機関の燃料供給通路の一部を構成する筒状ハウジング１は、外側電極と なる筒部２と、該筒部２の途中に形成された開口に対して該筒部２の中心軸と直 交する方向に接続された筒部３と、から構成される。筒部２の一端部には図示し ない燃料配管が接続される燃料入口部が開口され、筒部３の反接続側端部には同 様に図示しない燃料配管が接続される燃料出口部が開口される。筒部２内にはそ の中心軸に沿って延びる中心電極６が挿入されており、中心電極６の先端部は前 記燃料入口部４から所定距離下流側に位置し、後端部は筒部２後端部の内周面に 嵌合されたテフロン製のプロテクター７を介して筒部２後端部内周面に嵌合され たフッ素ゴムからなる０リング１０及びブッシュ９に貫通支持される。中心電極 ６のブッシュ９からの突出端部はナット１１等の締結具によって固定される。そ して、外側電極２と中心電極６に接続されたターミナル（図示せず）と定電圧電 源と抵抗とを直列に接続し、燃料中のアルコール濃度に応じて電極２，６間の静 電容量が変化することを利用して、センサからの信号に基づく電圧を測定するこ とにより、燃料中のアルコール濃度を検出する。0003 Therefore, the fuel supply passage of the internal combustion engine is equipped with a A capacitive alcohol sensor that outputs voltage has been proposed. This capacitive alcohol sensor is conventionally configured as shown in FIG. That is, the cylindrical housing 1 that constitutes a part of the fuel supply passage of the engine is connected to the outer electrode. cylindrical portion 2, and an opening formed in the middle of the cylindrical portion 2, which is perpendicular to the central axis of the cylindrical portion 2. It consists of cylindrical parts 3 connected in intersecting directions. As shown at one end of the cylindrical part 2, The fuel inlet to which the fuel pipe is connected is opened, and the opposite end of the cylindrical part 3 is connected to the same fuel inlet. Similarly, a fuel outlet portion to which a fuel pipe (not shown) is connected is opened. There is a A center electrode 6 extending along the central axis is inserted, and the tip of the center electrode 6 is located at the front. It is located a predetermined distance downstream from the fuel inlet section 4, and its rear end is on the inner circumferential surface of the rear end of the cylinder section 2. It is fitted onto the inner peripheral surface of the rear end of the cylindrical part 2 via the fitted Teflon protector 7. It is supported through an O-ring 10 and a bush 9 made of fluororubber. center electrode The protruding end portion of 6 from bush 9 is fixed with a fastener such as a nut 11. So Terminals (not shown) connected to the outer electrode 2 and the center electrode 6 and a constant voltage voltage A source and a resistor are connected in series, and static electricity between electrodes 2 and 6 is adjusted depending on the alcohol concentration in the fuel. Measures the voltage based on the signal from the sensor by taking advantage of changes in capacitance. The alcohol concentration in the fuel is detected.
【０００４】0004
しかしながらこのような従来のアルコールセンサにあっては、前記０リング１ ０によって筒部２の後端部側の液密シールを行うようにしているが、前記プロテ クター７外周面及び内周面夫々と筒部２内周面及び中心電極６外周面との間から ０リング１０が介装された空間部に燃料が侵入し、侵入した燃料と０リング１０ とが接触し、該０リングが次第に燃料を吸収して膨潤する虞があった。 However, in such a conventional alcohol sensor, the O ring 1 0 to perform a liquid-tight seal on the rear end side of the cylindrical portion 2. From between the outer circumferential surface and inner circumferential surface of the cylindrical part 7 and the inner circumferential surface of the cylindrical part 2 and the outer circumferential surface of the center electrode 6, respectively. Fuel enters the space where the O-ring 10 is inserted, and the entered fuel and the O-ring 10 There was a risk that the O-ring would gradually absorb fuel and swell.
【０００５】 このように０リング１０が燃料を吸収して膨潤した結果、図４に示すように、 燃料中のメタノールの吸収分だけ電極２，６間の静電容量が変化して、出力特性 が変化してしまい、このため、正確なメタノール量を計測できず、アルコール濃 度に基づいて制御する燃料供給量や点火時期を適正化できないという問題点があ った。[0005] As a result of the O-ring 10 absorbing fuel and swelling in this way, as shown in FIG. The capacitance between electrodes 2 and 6 changes by the amount of methanol absorbed in the fuel, and the output characteristics change. As a result, the amount of methanol cannot be accurately measured, and alcohol concentration changes. The problem is that it is not possible to optimize the fuel supply amount and ignition timing based on the It was.
【０００６】 そこで、本考案は以上のような従来の問題点に鑑み、０リングの介装部への燃 料の侵入を極力阻止する構成により、０リングの膨潤を緩和し、出力特性の変化 を防止して、正確なアルコール濃度を検出することを目的とする。[0006] Therefore, in view of the above-mentioned conventional problems, the present invention has been developed to prevent combustion from occurring at the intervening part of the O-ring. The structure prevents the intrusion of materials as much as possible, which alleviates the swelling of the O-ring and changes the output characteristics. The purpose is to detect accurate alcohol concentration.
【０００７】[0007]
このため、本考案のアルコールセンサは、燃料供給通路となり、かつ外側電極 として機能する筒部内にその中心軸に沿って中心電極を挿入した構成で、燃料中 のアルコール濃度に応じて外側電極と中心電極との間の静電容量が変化すること を利用して燃料中のアルコール濃度を検出するようにしたアルコールセンサであ って、中心電極の端部が固定保持手段を介して固定される筒部端部の内周面に、 前記中心電極が貫通する貫通孔を有する筒状のプロテクターを嵌合すると共に、 該プロテクターと前記固定保持手段との間の中心電極外周面と筒部内周面との間 に０リングを介装してなるアルコールセンサにおいて、前記プロテクターの外周 面及び内周面に夫々筒部内周面及び中心電極外周面に接触する環状のリブ部を張 り出し形成すると共に、該プロテクターの０リング側の端面を凹の曲面に形成し た構成とする。 Therefore, the alcohol sensor of the present invention serves as a fuel supply passage and an outer electrode. The structure has a center electrode inserted along its central axis into a cylinder that functions as a The capacitance between the outer electrode and the center electrode changes depending on the alcohol concentration of This is an alcohol sensor that detects the alcohol concentration in fuel using Therefore, the end of the center electrode is fixed to the inner circumferential surface of the end of the cylindrical part via the fixed holding means, Fitting a cylindrical protector having a through hole through which the center electrode passes, between the outer circumferential surface of the center electrode between the protector and the fixed holding means and the inner circumferential surface of the cylindrical portion; In the alcohol sensor in which an O-ring is interposed between the outer periphery of the protector and the An annular rib part that contacts the inner circumferential surface of the cylinder part and the outer circumferential surface of the center electrode is stretched on the surface and the inner circumferential surface, respectively. At the same time, the end surface of the protector on the O-ring side is formed into a concave curved surface. The configuration is as follows.
【０００８】[0008]
かかる構成において、プロテクターを筒部内周面に嵌合した状態において、リ ブ部が筒部内周面に圧接して変形する。この場合、リブ部と筒部内周面との圧接 面積は小さく、リブ部は高い圧力で筒部内周面に圧接して確実なシールを行う。 又、プロテクターの貫通孔に中心電極を貫通した状態において、リブ部が中心 電極外周面に圧接して変形する。この場合、リブ部と中心電極外周面との圧接面 積は小さく、リブ部は高い圧力で中心電極外周面に圧接して確実なシールを行う 。 In such a configuration, when the protector is fitted to the inner circumferential surface of the cylindrical portion, the rear The tab portion is pressed against the inner circumferential surface of the cylindrical portion and deforms. In this case, pressure contact between the rib part and the inner circumferential surface of the cylindrical part The area is small, and the rib portion presses against the inner peripheral surface of the cylindrical portion under high pressure to ensure a reliable seal. Also, when the center electrode is passed through the through hole of the protector, the rib part It is pressed against the outer peripheral surface of the electrode and deforms. In this case, the pressure contact surface between the rib part and the outer peripheral surface of the center electrode The area is small, and the rib part presses against the outer circumferential surface of the center electrode with high pressure to ensure a reliable seal. .
【０００９】 一方、プロテクターの０リング側の端面を凹の曲面に形成した結果、該端面が 平面の場合と比較して、該端面と０リング外周面との間の空間部、即ち、デッド ボリュームが少なくなる。この結果、前記空間部に燃料が侵入した場合、０リン グと接触する燃料の量を少なくすることができる。[0009] On the other hand, as a result of forming the end face of the protector on the O-ring side into a concave curved surface, the end face Compared to the case of a flat surface, the space between the end face and the outer peripheral surface of the O-ring, that is, the dead The volume will decrease. As a result, if fuel enters the space, The amount of fuel that comes into contact with the gas can be reduced.
【００１０】0010
以下、添付された図面を参照して本考案を詳述する。 尚、以下に参照する図において、図３と同一要素のものには同一符号を付して 説明を簡単にする。 図１において、燃料供給通路となり、かつ外側電極として機能する筒部２内に その中心軸に沿って中心電極６を挿入した構成で、燃料中のアルコール濃度に応 じて外側電極２と中心電極６との間の静電容量が変化することを利用して燃料中 のアルコール濃度を検出する構成は従来と同様である。 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the figures referred to below, the same elements as in Fig. 3 are given the same reference numerals. Make the explanation simple. In FIG. 1, there is a cylindrical portion 2 that serves as a fuel supply passage and serves as an outer electrode. With a configuration in which a center electrode 6 is inserted along the central axis, it responds to the alcohol concentration in the fuel. By utilizing the fact that the capacitance between the outer electrode 2 and the center electrode 6 changes during The configuration for detecting the alcohol concentration is the same as the conventional one.
【００１１】 又、中心電極６の端部が固定保持手段としてのブッシュ９，ナット１１等を介 して固定される筒部２端部の内周面に、前記中心電極６が貫通する筒状のプロテ クター１７を嵌合し、該プロテクター１７と前記固定保持手段との間の中心電極 ６外周面と筒部内周面との間に０リング１１を介装してなる構成も従来と同様で ある。[0011] Also, the end of the center electrode 6 is fixedly held by a bush 9, a nut 11, etc. A cylindrical protector, through which the center electrode 6 passes, is provided on the inner circumferential surface of the end of the cylindrical portion 2 that is fixed to the cylindrical portion. a center electrode between the protector 17 and the fixed holding means; The configuration in which the O-ring 11 is interposed between the outer circumferential surface of 6 and the inner circumferential surface of the cylindrical portion is also the same as the conventional one. be.
【００１２】 そして、従来と異なる構成は、前記プロテクター１７の外周面及び内周面に夫 々筒部２内周面及び中心電極６外周面に接触する環状のリブ部１８，１９を張り 出し形成すると共に、該プロテクター１７の０リング１０側の端面を凹の曲面２ ０に形成した点にある（第２図参照）。 ここで、前記リブ部１８は、プロテクター１７の外周面の軸方向の略中間位置 に形成される。又、前記リブ部１９は、プロテクター１７の大径と小径の貫通孔 １７ａ，１７ｂのうち小径の貫通孔１７ｂの軸方向の略中間位置に形成される。0012 The structure different from the conventional one is that the outer peripheral surface and the inner peripheral surface of the protector 17 are The annular rib portions 18 and 19 that contact the inner circumferential surface of the cylindrical portion 2 and the outer circumferential surface of the center electrode 6 are stretched. At the same time, the end surface of the protector 17 on the O-ring 10 side is formed into a concave curved surface 2. 0 (see Figure 2). Here, the rib portion 18 is located approximately in the middle of the outer peripheral surface of the protector 17 in the axial direction. is formed. Further, the rib portion 19 is formed through the large diameter and small diameter through holes of the protector 17. It is formed at a substantially intermediate position in the axial direction of the through hole 17b, which has a smaller diameter, between the through holes 17a and 17b.
【００１３】 かかるリブ部１８，１９は、断面形状が三角形に形成され、先端部が鋭角に形 成される。 かかる構成によると、プロテクター１７を筒部２内周面に嵌合した状態におい て、リブ部１８が筒部２内周面に圧接して変形する。この場合、リブ部１８と筒 部２内周面との圧接面積は小さく、リブ部１８は高い圧力で筒部２内周面に圧接 して確実なシールを行う。[0013] The rib portions 18 and 19 have a triangular cross-sectional shape, and the tip portions are shaped at an acute angle. will be accomplished. According to this configuration, when the protector 17 is fitted to the inner circumferential surface of the cylindrical portion 2, As a result, the rib portion 18 comes into pressure contact with the inner circumferential surface of the cylindrical portion 2 and is deformed. In this case, the rib portion 18 and the tube The area of pressure contact with the inner peripheral surface of part 2 is small, and the rib part 18 is pressed against the inner peripheral surface of cylindrical part 2 with high pressure. to ensure a secure seal.
【００１４】 又、プロテクター１７の貫通孔１７ａ，１７ｂに中心電極６を貫通した状態に おいて、リブ部１９が中心電極６外周面に圧接して変形する。この場合、リブ部 １９と中心電極６外周面との圧接面積は小さく、リブ部１９は高い圧力で中心電 極６外周面に圧接して確実なシールを行う。 一方、プロテクター１７の０リング１０側の端面を凹の曲面２０に形成した結 果、該端面が平面の場合と比較して、該端面と０リング１０外周面との間の空間 部、即ち、デッドボリュームが少なくなる。この結果、前記空間部に燃料が侵入 した場合、０リング１０と接触する燃料の量を少なくすることができる。[0014] In addition, the center electrode 6 is inserted into the through holes 17a and 17b of the protector 17. At this time, the rib portion 19 comes into pressure contact with the outer peripheral surface of the center electrode 6 and is deformed. In this case, the rib part 19 and the outer circumferential surface of the center electrode 6 is small, and the rib portion 19 is pressed against the center electrode 6 under high pressure. Pressure contacts the outer circumferential surface of pole 6 to ensure a reliable seal. On the other hand, the end surface of the protector 17 on the O-ring 10 side is formed into a concave curved surface 20. As a result, the space between the end face and the outer peripheral surface of the O-ring 10 is smaller than when the end face is flat. In other words, the dead volume is reduced. As a result, fuel enters the space. In this case, the amount of fuel that comes into contact with the O-ring 10 can be reduced.
【００１５】 以上のようにプロテクター１７の液密シール機能を向上し、０リング１０と接 触する燃料の量を少なくできる結果、０リング１０が燃料を吸収して膨潤するの を緩和することができ、電極２，６間の静電容量の変化を少なくでき、出力特性 の変化を極力抑えることができる。従って、正確なメタノール量を計測できるよ うになり、アルコール濃度に基づいて制御する燃料供給量や点火時期を適正化で きる。[0015] As described above, the liquid-tight sealing function of the protector 17 is improved, and the protector 17 is brought into contact with the O-ring 10. As a result of reducing the amount of fuel that comes in contact with the O-ring 10, it absorbs fuel and swells. It is possible to reduce the change in capacitance between electrodes 2 and 6, and improve the output characteristics. changes can be suppressed as much as possible. Therefore, it is possible to accurately measure the amount of methanol. This makes it possible to optimize the fuel supply amount and ignition timing based on alcohol concentration. Wear.
【００１６】 尚、以上のように、特定の実施例を参照して本考案を説明したが、本考案はこ れに限定されるものではなく、当該技術分野における熟練者等により、本考案に 添付された実用新案登録請求の範囲から逸脱することなく、種々の変更及び修正 が可能であるとの点に留意すべきである。[0016] Although the present invention has been explained above with reference to specific embodiments, the present invention is not limited to this. The present invention is not limited to this invention by experts in the relevant technical field. Various changes and modifications may be made without departing from the scope of the attached utility model registration claims. It should be noted that this is possible.
【００１７】[0017]
以上説明したように、本考案に係るアルコールセンサによれば、プロテクター の構造の改良を図って、液密シール機能を向上し、０リングと接触する燃料の量 を少なくするようにした結果、０リングが燃料を吸収して膨潤するのを緩和する ことができ、出力特性の変化を極力抑えることができ、もって、正確なアルコー ル濃度の計測が可能となる実用的効果大なるものである。 As explained above, according to the alcohol sensor according to the present invention, the protector The structure of the O-ring has been improved to improve its liquid-tight sealing function and reduce the amount of fuel that comes into contact with the O-ring As a result of reducing the amount of fuel, the O-ring absorbs fuel and swells. This makes it possible to suppress changes in output characteristics as much as possible, thereby ensuring accurate alcohol This has a great practical effect of making it possible to measure the concentration of fluorine.
【図面の簡単な説明】[Brief explanation of drawings]
【図１】 本考案のアルコールセンサの一実施例の断面
図[Figure 1] Cross-sectional view of one embodiment of the alcohol sensor of the present invention
【図２】 同上実施例のプロテクターの断面図[Figure 2] Cross-sectional view of the protector of the example above
【図３】 従来のアルコールセンサの一例の断面図[Figure 3] Cross-sectional view of an example of a conventional alcohol sensor
【図４】 メタノール濃度と静電容量との関係の従来の
問題点を説明する特性図[Figure 4] Characteristic diagram explaining the conventional problem of the relationship between methanol concentration and capacitance
２ 筒部（外側電極） ６ 中心電極 ９ ブッシュ １０ ０リング １１ ナット １７ プロテクター １８ リブ部 １９ リブ部 ２０ 曲面 2 Cylindrical part (outer electrode) 6 Center electrode 9 Bush 100 ring 11 Nut 17 Protector 18 Rib part 19 Rib part 20 Curved surface
Claims (1)
機能する筒部内にその中心軸に沿って中心電極を挿入し
た構成で、燃料中のアルコール濃度に応じて外側電極と
中心電極との間の静電容量が変化することを利用して燃
料中のアルコール濃度を検出するようにしたアルコール
センサであって、中心電極の端部が固定保持手段を介し
て固定される筒部端部の内周面に、前記中心電極が貫通
する貫通孔を有する筒状のプロテクターを嵌合すると共
に、該プロテクターと前記固定保持手段との間の中心電
極外周面と筒部内周面との間に０リングを介装してなる
アルコールセンサにおいて、前記プロテクターの外周面
及び内周面に夫々筒部内周面及び中心電極外周面に接触
する環状のリブ部を張り出し形成すると共に、該プロテ
クターの０リング側の端面を凹の曲面に形成したことを
特徴とするアルコールセンサ。Claim 1: A structure in which a center electrode is inserted along its central axis into a cylindrical portion that serves as a fuel supply passage and also functions as an outer electrode, and the distance between the outer electrode and the center electrode is determined according to the alcohol concentration in the fuel. An alcohol sensor that detects the alcohol concentration in fuel by utilizing changes in capacitance, the inner periphery of the end of the cylindrical part to which the end of the center electrode is fixed via a fixed holding means. A cylindrical protector having a through hole through which the center electrode passes is fitted to the surface, and an O-ring is provided between the outer peripheral surface of the center electrode and the inner peripheral surface of the cylindrical portion between the protector and the fixed holding means. In the alcohol sensor, an annular rib portion is formed on the outer circumferential surface and the inner circumferential surface of the protector to contact the inner circumferential surface of the cylinder part and the outer circumferential surface of the center electrode, respectively, and the end surface of the protector on the O-ring side. An alcohol sensor characterized by having a concave curved surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4162591U JP2532683Y2 (en) | 1991-06-04 | 1991-06-04 | Alcohol sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4162591U JP2532683Y2 (en) | 1991-06-04 | 1991-06-04 | Alcohol sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04134062U true JPH04134062U (en) | 1992-12-14 |
| JP2532683Y2 JP2532683Y2 (en) | 1997-04-16 |
Family
ID=31922345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4162591U Expired - Fee Related JP2532683Y2 (en) | 1991-06-04 | 1991-06-04 | Alcohol sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2532683Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4719570B2 (en) * | 2005-12-27 | 2011-07-06 | 日本特殊陶業株式会社 | Liquid state detection sensor |
-
1991
- 1991-06-04 JP JP4162591U patent/JP2532683Y2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4719570B2 (en) * | 2005-12-27 | 2011-07-06 | 日本特殊陶業株式会社 | Liquid state detection sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2532683Y2 (en) | 1997-04-16 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |