JPH0656765U - Capacitance sensor - Google Patents
Capacitance sensorInfo
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- JPH0656765U JPH0656765U JP285893U JP285893U JPH0656765U JP H0656765 U JPH0656765 U JP H0656765U JP 285893 U JP285893 U JP 285893U JP 285893 U JP285893 U JP 285893U JP H0656765 U JPH0656765 U JP H0656765U
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- electrode
- side electrode
- alcohol
- electrode portion
- outer peripheral
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Abstract
(57)【要約】
【目的】 各電極間にベーパが滞在するのを防止し、ア
ルコール混合液体の静電容量を高精度に測定する。
【構成】 各電極２Ａ，２Ｂ，２Ｃから同軸筒状に形成
された一側電極部２と、各電極５Ａ，５Ｂ，５Ｃから同
軸筒状に形成された他側電極部５とを、互い違いに組合
わせ、各電極部２，５間に検出用流路６を設ける構成と
した。そして、流入口７からアルコール混合ガソリンが
流入すると、このアルコール混合ガソリンは検出用流路
６内を流通するから、アルコール混合ガソリン中のベー
パも強制的に流出口８に向けて排出される。
(57) [Abstract] [Purpose] To prevent vapor from staying between electrodes and to measure the capacitance of alcohol mixed liquid with high accuracy. [Structure] One side electrode portion 2 formed from each electrode 2A, 2B, 2C in a coaxial cylindrical shape and another side electrode portion 5 formed from each electrode 5A, 5B, 5C in a coaxial cylindrical shape are staggered. In combination, the detection flow path 6 is provided between the electrode portions 2 and 5. Then, when the alcohol-mixed gasoline flows from the inflow port 7, the alcohol-mixed gasoline flows through the detection flow path 6, so that the vapor in the alcohol-mixed gasoline is forcibly discharged toward the outflow port 8.
Description
【０００１】[0001]
本考案は、例えばアルコール混合ガソリン等のアルコール混合液体中のアルコ ール濃度等を測定するのに用いて好適な静電容量センサに関し、特に複数の電極 を同軸筒状に配設してなる静電容量センサに関する。 The present invention relates to a capacitance sensor suitable for measuring the concentration of alcohol in an alcohol-mixed liquid such as alcohol-mixed gasoline, and particularly to a static capacitance sensor having a plurality of electrodes arranged coaxially. The present invention relates to a capacitance sensor.
【０００２】[0002]
近年、環境保護の要請により、ガソリンにアルコールを混合してなるアルコー ル混合液体としてのアルコール混合ガソリンを用いる自動車用エンジンが開発さ れているが、アルコールの濃度によって空燃比が異なるため、エンジンの燃料配 管の途中等に、アルコール混合ガソリンの静電容量（誘電率）に基づいてアルコ ール濃度を測定する静電容量センサを設けるようになっている。 In recent years, automobile engines using alcohol-blended gasoline as an alcohol-blended liquid in which alcohol is mixed with gasoline have been developed in response to environmental protection requirements.However, since the air-fuel ratio varies depending on the alcohol concentration, the engine A capacitance sensor for measuring the alcohol concentration based on the capacitance (dielectric constant) of alcohol-blended gasoline is provided in the middle of the fuel pipe.
【０００３】 そして、この種の静電容量センサとしては、複数の電極を同軸円筒状に配設し たものが、例えば実開平１−９９０５６号公報、実開平１−９９０５７号公報お よび実開平１−９７２５５号公報等によって知られている。As this type of capacitance sensor, one having a plurality of electrodes arranged in a coaxial cylindrical shape is disclosed in, for example, Japanese Utility Model Laid-Open No. 1-99056, Japanese Utility Model Laid-Open No. 1-99057 and Japanese Utility Model Laid-Open No. 1-99057. It is known from Japanese Patent Publication No. 1-97255.
【０００４】[0004]
ところで、上述した各従来技術による静電容量センサは、筒状ないし半筒状の 電極を同軸状に配設することにより、各電極間に介在するアルコール混合ガソリ ンの静電容量を検出し、この静電容量に基づいてアルコール混合ガソリン中のア ルコール濃度を測定するものである。 By the way, the above-mentioned capacitance sensors according to the related arts detect the capacitance of the alcohol-mixed gasoline interposed between the electrodes by arranging the cylindrical or semi-cylindrical electrodes coaxially. Based on this capacitance, the alcohol concentration in alcohol-blended gasoline is measured.
【０００５】 しかし、実開平１−９９０５６号公報および実開平１−９９０５７号公報に示 す静電容量センサは、電極間距離が狭いから、該各電極間に侵入したベーパが抜 けにくく、該ベーパの分だけ静電容量が変化してしまい、静電容量の検出精度や 信頼性が大幅に低下するという問題がある。特に、これらの各従来技術による静 電容量センサにあっては、電極に多数の小孔を穿設しているものの、これらの小 孔は各電極間にアルコール混合ガソリンを導入するための穴にしか過ぎないため 、アルコール混合ガソリン中のベーパを抜くのが難しいという問題がある。However, in the capacitance sensors disclosed in Japanese Utility Model Laid-Open No. 1-99056 and Japanese Utility Model Laid-Open No. 1-99057, since the distance between the electrodes is narrow, it is difficult to remove the vapor that has entered between the electrodes, There is a problem in that the capacitance changes by the amount of vapor, and the detection accuracy and reliability of the capacitance drop significantly. In particular, in each of the electrostatic capacity sensors according to these conventional techniques, a large number of small holes are formed in the electrodes, but these small holes are holes for introducing alcohol-blended gasoline between the electrodes. Since it is just too much, it is difficult to remove the vapor in the alcohol-blended gasoline.
【０００６】 一方、実開平１−９７２５５号公報に示す静電容量センサでは、上述した問題 を解決すべく、半筒状電極の対向面に上下に貫通するベーパ抜き用の開口部を設 けているが、このベーパ抜き用開口部のために、全体構造が複雑化し、部品点数 や組立工数が増大し、製造コストが大幅に上昇するという問題がある。On the other hand, in the capacitance sensor disclosed in Japanese Utility Model Laid-Open No. 1-97255, in order to solve the above-mentioned problem, an opening for vapor removal that vertically penetrates is provided in the facing surface of the semi-cylindrical electrode. However, there is a problem in that the opening for vapor removal complicates the entire structure, increases the number of parts and the number of assembly steps, and significantly increases the manufacturing cost.
【０００７】 本考案は上述した従来技術の問題に鑑みなされたもので、各電極間にベーパが 滞在するのを効果的に防止して、アルコール混合液体の静電容量を高精度に測定 することができ、組立性等を向上できるようにした静電容量センサを提供するこ とを目的とする。The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to effectively prevent the vapor from staying between the electrodes and measure the capacitance of the alcohol-mixed liquid with high accuracy. It is an object of the present invention to provide a capacitance sensor capable of improving the assembling property and the like.
【０００８】[0008]
上述した課題を解決するために、本考案が採用する構成は、複数の電極を同軸 筒状に配設してなる一側電極部と、該一側電極部に対向して設けられ、該一側電 極部の各電極と互い違いに組合わされる複数の電極を同軸筒状に配設してなる他 側電極部と、前記一側電極部と該他側電極部との間に設けられ、内部にアルコー ル混合液体を流通させる検出用流路と、該検出用流路の流入側に設けられた流入 口と、前記検出用流路の流出側に設けられた流出口とからなる。 In order to solve the above-mentioned problems, the configuration adopted by the present invention is one side electrode part formed by arranging a plurality of electrodes in a coaxial cylindrical shape, and is provided so as to face the one side electrode part. The other side electrode part, which is formed by arranging a plurality of electrodes which are alternately combined with the respective electrodes of the side electrode part in a coaxial cylindrical shape, and is provided between the one side electrode part and the other side electrode part, It is composed of a detection channel through which the alcohol mixed liquid flows, an inflow port provided on the inflow side of the detection channel, and an outflow port provided on the outflow side of the detection channel.
【０００９】 また、前記流入口と流出口とを接続するバイパス流路を設けてもよい。Further, a bypass flow path connecting the inflow port and the outflow port may be provided.
【００１０】[0010]
上記構成により、流入口から検出用流路内に流入したアルコール混合液体は、 該検出用流路を流通する間に一側電極部と他側電極部によってその静電容量が検 出され、ベーパと共に流出口から流出する。 With the above configuration, the alcohol mixed liquid flowing from the inflow port into the detection channel has its capacitance detected by the one-side electrode section and the other-side electrode section while flowing through the detection channel, and the Along with it, it flows out from the outlet.
【００１１】 また、流入口と流出口とを接続するバイパス流路を設ければ、アルコール混合 液体の大部分がベーパと共にバイパス流路に流入し、流出口から流出する。Further, if a bypass flow path connecting the inflow port and the outflow port is provided, most of the alcohol mixed liquid flows into the bypass flow path together with the vapor and flows out from the outflow port.
【００１２】[0012]
以下、本考案の実施例を図１ないし図４に基づき、自動車用エンジンに使用さ れるアルコール混合ガソリンのアルコール濃度を測定する場合を例に挙げて説明 する。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4 as an example in which the alcohol concentration of alcohol-blended gasoline used in an automobile engine is measured.
【００１３】 図において、１は自動車用エンジンの燃料配管（図示せず）の途中に設けられ た電極本体を示し、該電極本体１は、後述の一側電極部２と他側電極部５とから 同軸筒状に形成されている。そして、該電極本体１は、発振回路、周波数ー電圧 変換回路、増幅回路（いずれも図示せず）と接続され、各電極部２，５間で検出 した静電容量をこれらの各回路に出力するものである。In the figure, reference numeral 1 denotes an electrode main body provided in the middle of a fuel pipe (not shown) of an automobile engine, and the electrode main body 1 includes a one side electrode portion 2 and another side electrode portion 5 which will be described later. Is formed into a coaxial cylindrical shape. The electrode body 1 is connected to an oscillating circuit, a frequency-voltage converting circuit, and an amplifying circuit (neither is shown), and outputs the electrostatic capacitance detected between the electrode parts 2 and 5 to each of these circuits. To do.
【００１４】 ２はステンレス等の導電性材料から形成された一側電極部を示し、該一側電極 部２は、図２にも示す如く、最内周側に位置して小径筒状に形成された内周電極 ２Ａと、該内周電極２Ａの外周側に離間して位置し、筒状に形成された中間電極 ２Ｂと、該中間電極２Ｂの外周側に離間して位置し、大径の有底筒状に形成され た外周電極２Ｃとから同軸筒状に構成され、該一側電極部２の外周電極２Ｃは電 極本体１のケーシングを構成している。そして、該一側電極部２は、例えば外周 電極２Ｃの外周側に取付けられたリード線（図示せず）を介して発振回路等と接 続されている。Reference numeral 2 denotes a one-side electrode portion formed of a conductive material such as stainless steel. The one-side electrode portion 2 is formed in a small-diameter cylindrical shape at the innermost peripheral side as shown in FIG. The inner peripheral electrode 2A and the outer peripheral side of the inner peripheral electrode 2A are spaced apart from each other, and the cylindrical intermediate electrode 2B is separated from the outer peripheral side of the intermediate electrode 2B. The outer peripheral electrode 2C formed in the bottomed cylindrical shape and the outer peripheral electrode 2C of the one side electrode portion 2 constitute a casing of the electrode body 1. The one-side electrode portion 2 is connected to an oscillation circuit or the like via a lead wire (not shown) attached to the outer peripheral side of the outer peripheral electrode 2C, for example.
【００１５】 ３はステンレス等の導電性材料から環状に形成された蓋体を示し、該蓋体３は Ｏリング等のシール部材４を介して一側電極部２の外周電極２Ｃ開口部を液密に 施蓋している。また、該蓋体３は、その内周側に一側電極部２の内周電極２Ａが 溶接等の手段を用いて固着されると共に、その径方向中間部には一側電極部２の 中間電極２Ｂが溶接等の手段を用いて固着され、これにより、一側電極部２の各 電極２Ａ，２Ｂ，２Ｃを電気的に接続している。Reference numeral 3 denotes a lid body formed of a conductive material such as stainless steel in an annular shape, and the lid body 3 liquidates the opening of the outer peripheral electrode 2C of the one-side electrode portion 2 via a seal member 4 such as an O-ring. Covered tightly. The inner peripheral electrode 2A of the one-side electrode portion 2 is fixed to the inner peripheral side of the lid body 3 by means of welding or the like, and the intermediate portion of the one-side electrode portion 2 is in the radial middle portion. The electrode 2B is fixed by using a means such as welding, and thereby the electrodes 2A, 2B and 2C of the one side electrode portion 2 are electrically connected.
【００１６】 ５は一側電極部２と対向して位置し、該一側電極部２の外周電極２Ｃ内に同軸 に設けられた導電性材料からなる他側電極部を示し、該他側電極部５は、基端側 が一側電極部２の外周電極２Ｃから外部に突出し、先端側が一側電極部２の内周 電極２Ａ内に同軸に伸長した小径棒状の内周電極５Ａと、該内周電極５Ａの外周 側に離間して位置し、一側電極部２の内周電極２Ａと中間電極２Ｂとの間に同軸 に設けられた有底筒状の中間電極５Ｂと、該中間電極５Ｂの外周側に離間して位 置し、一側電極部２の中間電極２Ｂと外周電極２Ｃとの間に同軸に設けられた有 底筒状の外周電極５Ｃとから同軸筒状に構成され、該各電極５Ａ，５Ｂ，５Ｃは 一側電極部２の各電極２Ａ，２Ｂ，２Ｃと例えば２ｍｍ程度の所定寸法ｄだけ径 方向にそれぞれ離間して、互い違いに組合わされている。また、該他側電極部５ は、内周電極５Ａの基端側に中間電極５Ｂと外周電極５Ｃとが嵌合されることに より、各電極５Ａ，５Ｂ，５Ｃが電気的に接続され、例えば内周電極５Ａの基端 側がリード線（図示せず）を介して発振回路等に接続されている。Reference numeral 5 denotes an opposite side electrode portion made of a conductive material, which is positioned so as to face the one side electrode portion 2 and is coaxially provided inside the outer peripheral electrode 2 C of the one side electrode portion 2. The portion 5 has a small-diameter rod-shaped inner peripheral electrode 5A which has a proximal end protruding outward from the outer peripheral electrode 2C of the one-side electrode part 2 and a distal end side coaxially extending into the inner peripheral electrode 2A of the one-side electrode part 2. A cylindrical bottomed intermediate electrode 5B, which is located on the outer circumference side of the inner circumference electrode 5A and is spaced apart from the inner circumference electrode 5A, is provided coaxially between the inner circumference electrode 2A and the middle electrode 2B of the one-side electrode portion 2, and the middle electrode. 5B is spaced apart on the outer peripheral side of 5B, and has a bottomed cylindrical outer peripheral electrode 5C coaxially provided between the intermediate electrode 2B of the one-side electrode portion 2 and the outer peripheral electrode 2C. , Each of the electrodes 5A, 5B, 5C has a radius of a predetermined dimension d of, for example, about 2 mm from each of the electrodes 2A, 2B, 2C of the one-side electrode portion 2. They are spaced apart from each other and are staggered. Further, in the other side electrode portion 5, by fitting the intermediate electrode 5B and the outer peripheral electrode 5C to the base end side of the inner peripheral electrode 5A, the respective electrodes 5A, 5B, 5C are electrically connected, For example, the base end side of the inner peripheral electrode 5A is connected to an oscillation circuit or the like via a lead wire (not shown).
【００１７】 ６は一側電極部２と他側電極部５との間に設けられた単一の検出用流路で、該 検出用流路６は、一側電極部２の各電極２Ａ，２Ｂ，２Ｃと他側電極部５の各電 極５Ａ，５Ｂ，５Ｃとが互い違いに組合わされることにより、電極本体１内に形 成されるもので、燃料配管中のアルコール混合ガソリンをベーパと共に矢示方向 に流通させるようになっている。Reference numeral 6 denotes a single detection channel provided between the one-side electrode section 2 and the other-side electrode section 5, and the detection channel 6 is provided for each electrode 2 A, 2B, 2C and the respective electrodes 5A, 5B, 5C of the other side electrode portion 5 are alternately combined to form in the electrode body 1, and the alcohol mixed gasoline in the fuel pipe together with the vapor. It is designed to be distributed in the direction of the arrow.
【００１８】 ７は検出用流路６の流入側に位置して一側電極部２の内周電極２Ａ端部に一体 形成された流入口、８は検出用流路６の流出側に位置して一側電極部２の外周電 極２Ｃ外周側に一体形成された流出口をそれぞれ示し、該流入口７，流出口８は それぞれ例えばゴムホース（図示せず）等を介して燃料配管の途中に接続されて いる。Reference numeral 7 denotes an inflow port which is located on the inflow side of the detection flow channel 6 and which is integrally formed at the end of the inner peripheral electrode 2 A of the one-side electrode portion 2, and 8 is located on the outflow side of the detection flow channel 6. And outlets integrally formed on the outer peripheral side of the outer electrode 2C of the one-side electrode portion 2, respectively. The inlet 7 and the outlet 8 are provided in the middle of the fuel pipe via, for example, a rubber hose (not shown). It is connected.
【００１９】 ９は一側電極部２の外周電極２Ｃ底部側に位置して、該外周電極２Ｃと他側電 極部５の外周電極５Ｃとの間に設けられた環状の絶縁板、１０は一側電極部２の 外周電極２Ｃ外部に位置して他側電極部５の内周電極５Ａ基端側に嵌合された段 付筒状の栓体を示し、前記絶縁板９および該栓体１０は、例えば樹脂材料等の絶 縁性材料から形成されている。Reference numeral 9 denotes an annular insulating plate located on the bottom side of the outer peripheral electrode 2C of the one-side electrode portion 2 and provided between the outer peripheral electrode 2C and the outer peripheral electrode 5C of the other-side electrode portion 5. The stepped cylindrical plug body located outside the outer peripheral electrode 2C of the one-side electrode portion 2 and fitted to the inner peripheral electrode 5A base end side of the other-side electrode portion 5 is shown as the insulating plate 9 and the plug body. 10 is made of an insulating material such as a resin material.
【００２０】 なお、１１，１１は絶縁板９の内周側と他側電極部５の内周電極５Ａとの間、 栓体１０の外周側と一側電極部２の外周電極２Ｃとの間にそれぞれ設けられたＯ リングである。In addition, 11 and 11 are between the inner peripheral side of the insulating plate 9 and the inner peripheral electrode 5 A of the other side electrode part 5, and between the outer peripheral side of the plug 10 and the outer peripheral electrode 2 C of the one side electrode part 2. The O-rings are respectively provided in the.
【００２１】 本実施例による静電容量センサは上述の如き構成を有するもので、まず、他側 電極部５の内周電極５Ａ基端側に中間電極５Ｂ、外周電極５Ｃを嵌合することに より同軸筒状の他側電極部５を形成し、次に、該他側電極部５を絶縁板９、栓体 １０等を介して一側電極部２の外周電極２Ｃ内に取付ける。そして、一側電極部 ２の内周電極２Ａおよび中間電極２Ｂが固着された蓋体３を一側電極部２の外周 電極２Ｃ開口部に取付けることにより、一側電極部２の各電極２Ａ，２Ｂ，２Ｃ と他側電極部５の各電極５Ａ，５Ｂ，５Ｃを同軸に互い違いに組合わせて、内部 に単一の検出用流路６を形成し、ゴムホース等を介して燃料配管の途中等に取付 ける。The capacitance sensor according to the present embodiment has the above-described configuration. First, the intermediate electrode 5B and the outer peripheral electrode 5C are fitted to the base end side of the inner peripheral electrode 5A of the other side electrode portion 5. The other side electrode portion 5 having a coaxial cylindrical shape is formed, and then the other side electrode portion 5 is attached inside the outer peripheral electrode 2C of the one side electrode portion 2 via the insulating plate 9, the plug 10, and the like. Then, by attaching the lid 3 to which the inner peripheral electrode 2A and the intermediate electrode 2B of the one-side electrode portion 2 are fixed to the outer peripheral electrode 2C opening of the one-side electrode portion 2, each electrode 2A of the one-side electrode portion 2, 2B, 2C and the respective electrodes 5A, 5B, 5C of the other side electrode portion 5 are coaxially and alternately combined to form a single detection flow passage 6 inside, and a fuel hose or the like is provided in the middle of the fuel pipe. Can be attached to.
【００２２】 本実施例による静電容量センサは、このようにして製造されるもので、次に、 その作動について説明する。The capacitance sensor according to the present embodiment is manufactured in this way, and its operation will be described next.
【００２３】 まず、燃料配管内のアルコール混合ガソリンが流入口７から検出用流路６内に 流入すると、このアルコール混合ガソリンはベーパと共に、一側電極部２の内周 電極２Ａと他側電極部５の内周電極５Ａとの間、一側電極部２の内周電極２Ａと 他側電極部５の中間電極５Ｂとの間、他側電極部５の中間電極５Ｂと一側電極部 ２の中間電極２Ｂとの間、一側電極部２の中間電極２Ｂと他側電極部５の外周電 極５Ｃとの間、他側電極部５の外周電極５Ｃと一側電極部２の外周電極２Ｃとの 間を順次流通して流出口８に達し、該流出口８から燃料配管に流出する。First, when the alcohol-mixed gasoline in the fuel pipe flows into the detection flow path 6 from the inflow port 7, this alcohol-mixed gasoline together with the vapor, the inner peripheral electrode 2 A of the one-side electrode part 2 and the other-side electrode part 5 between the inner peripheral electrode 5A, the inner peripheral electrode 2A of the one side electrode part 2 and the intermediate electrode 5B of the other side electrode part 5, the intermediate electrode 5B of the other side electrode part 5 and the one side electrode part 2 of Between the intermediate electrode 2B, between the intermediate electrode 2B of the one side electrode part 2 and the outer peripheral electrode 5C of the other side electrode part 5, between the outer peripheral electrode 5C of the other side electrode part 5 and the outer peripheral electrode 2C of the one side electrode part 2. And flow to the outlet 8 and flow out from the outlet 8 to the fuel pipe.
【００２４】 これにより、電極本体１は、各電極部２，５間に生じたアルコール混合ガソリ ンの静電容量を発振回路等に出力し、この検出された静電容量に基づいてアルコ ール混合ガソリン中のアルコール濃度を測定する。As a result, the electrode body 1 outputs the electrostatic capacitance of the alcohol-mixed gasoline generated between the electrode portions 2 and 5 to the oscillation circuit or the like, and the alcohol is based on the detected electrostatic capacitance. The alcohol concentration in the mixed gasoline is measured.
【００２５】 かくして、本実施例によれば、同軸筒状の各電極部２，５を互い違いに組合わ せることにより、該各電極部２，５間に単一の検出用流路６を設ける構成とした から、アルコール混合ガソリンにベーパが混入している場合でも、検出用流路６ 内に侵入したベーパをアルコール混合ガソリンによって強制的に流出口８に向け て排出できる。この結果、各電極部２，５間にベーパが滞在する時間を効果的に 短縮することができ、このベーパによって静電容量が変化するのを防止して、静 電容量の検出精度や信頼性等を大幅に向上することができる。Thus, according to the present embodiment, the coaxial tubular electrode portions 2 and 5 are alternately combined to provide a single detection channel 6 between the electrode portions 2 and 5. Because of the configuration, even if the alcohol mixed gasoline contains vapor, the vapor that has entered the detection flow path 6 can be forcibly discharged toward the outlet 8 by the alcohol mixed gasoline. As a result, the time that the vapor stays between the electrode parts 2 and 5 can be effectively shortened, the electrostatic capacitance is prevented from changing by this vapor, and the electrostatic capacitance detection accuracy and reliability are improved. Etc. can be greatly improved.
【００２６】 また、従来技術で述べた如くベーパ抜き用の開口部を設ける必要がないから、 各電極部２，５の各電極２Ａ，２Ｂ，２Ｃ，５Ａ，５Ｂ，５Ｃを筒状に形成して 、該各電極部２，５を容易に同軸筒状にすることができ、部品点数を低減して組 立性を大幅に向上することができる。Further, since it is not necessary to provide an opening for removing vapor as described in the prior art, each electrode 2A, 2B, 2C, 5A, 5B, 5C of each electrode portion 2, 5 is formed in a cylindrical shape. As a result, the respective electrode portions 2 and 5 can be easily formed into a coaxial cylindrical shape, the number of parts can be reduced, and the assembling property can be greatly improved.
【００２７】 さらに、流入口７を一側電極部２の内周電極２Ａに一体形成し、流出口８を一 側電極部２の外周電極２Ｃに一体形成する構成としたから、部品点数を低減して 組立性を向上できる。Further, since the inflow port 7 is integrally formed with the inner peripheral electrode 2A of the one-side electrode part 2 and the outflow port 8 is integrally formed with the outer peripheral electrode 2C of the one-side electrode part 2, the number of parts is reduced. The assemblability can be improved.
【００２８】 次に、図３および図４は本考案の第２の実施例を示し、本実施例の特徴は流入 口と流出口とを接続するバイパス流路を設けたことにある。なお、本実施例では 、上述した図１および図２に示す第１の実施例と同一の構成要素に同一の符号を 付し、その説明を省略するものとする。Next, FIG. 3 and FIG. 4 show a second embodiment of the present invention, and the feature of this embodiment is that a bypass passage connecting the inflow port and the outflow port is provided. In this embodiment, the same components as those of the first embodiment shown in FIGS. 1 and 2 described above are designated by the same reference numerals, and the description thereof will be omitted.
【００２９】 図中、２１は本実施例に適用される電極本体、２２は該電極本体２１を後述の 他側電極部２４と共に構成する一側電極部をそれぞれ示し、該一側電極部２２は 前記第１の実施例で述べた一側電極部２とほぼ同様に、内周電極２２Ａ、中間電 極２２Ｂ、外周電極２２Ｃから同軸筒状に形成されている。しかし、本実施例に よる一側電極部２２には、図４にも示す如く、外周電極２２Ｃの上部外周側に後 述のバイパス流路２５が設けられている点で、第１の実施例によるものと相違す る。In the figure, 21 is an electrode body applied to this embodiment, 22 is a one-side electrode portion that constitutes the electrode body 21 together with the other-side electrode portion 24 described later, and the one-side electrode portion 22 is Similar to the one-side electrode portion 2 described in the first embodiment, the inner peripheral electrode 22A, the intermediate electrode 22B, and the outer peripheral electrode 22C are formed in a coaxial cylindrical shape. However, as shown in FIG. 4, the one-side electrode portion 22 according to the present embodiment is provided with the bypass flow passage 25, which will be described later, on the upper outer peripheral side of the outer peripheral electrode 22C. It is different from
【００３０】 ２３は蓋体を示し、該蓋体２３は第１の実施例で述べた蓋体３とほぼ同様に、 ステンレス等の導電性材料から形成され、一側電極部２２の外周電極２２Ｃ開口 部を施蓋している。しかも、本実施例による蓋体２３の外周側には、切欠部２３ Ａが周方向に切り欠かれて形成されている。Reference numeral 23 denotes a lid, and the lid 23 is made of a conductive material such as stainless steel and is similar to the lid 3 described in the first embodiment, and the outer peripheral electrode 22C of the one-side electrode portion 22 is formed. The opening is covered. Moreover, a cutout portion 23A is formed by cutting out in the circumferential direction on the outer peripheral side of the lid body 23 according to the present embodiment.
【００３１】 ２４は本実施例による他側電極部を示し、該他側電極部２４は前記第１の実施 例で述べた他側電極部５と同様に、内周電極２４Ａ、中間電極２４Ｂ、外周電極 ２４Ｃから同軸筒状に形成され、一側電極部２２と同軸に互い違いに組合されて いる。Reference numeral 24 denotes the other-side electrode portion according to this embodiment, and the other-side electrode portion 24 is similar to the other-side electrode portion 5 described in the first embodiment, and the inner peripheral electrode 24A, the intermediate electrode 24B, The outer peripheral electrode 24C is formed in a coaxial cylindrical shape and is coaxially and alternately combined with the one-side electrode portion 22.
【００３２】 ２５は電極本体２１の上部外周側に設けられたバイパス流路としてのバイパス 管路を示し、該バイパス管路２５は、その一端側が蓋体２３よりも上流側に位置 して流入口８の途中に接続され、その他端側は流出口８の基端側に接続されてい る。そして、該バイパス管路２５は、流路が入り組んだ検出用流路６よりも低い 流動抵抗を利用して、流入口７から流入したアルコール混合ガソリンの大部分を ベーパと共に流出口８側に導くものである。Reference numeral 25 denotes a bypass pipe line provided as a bypass flow passage provided on the outer peripheral side of the upper part of the electrode main body 21, and one end side of the bypass pipe line 25 is located on the upstream side of the lid body 23 and an inlet port. 8 is connected in the middle, and the other end side is connected to the base end side of the outflow port 8. The bypass pipe 25 guides most of the alcohol-mixed gasoline flowing from the inflow port 7 to the outflow port 8 side together with the vapor by utilizing the flow resistance lower than that of the detection flow channel 6 in which the flow channels are complicated. It is a thing.
【００３３】 かくして、このように構成される本実施例でも、上述した前記第１の実施例と ほぼ同様の作用効果を得ることができる。しかし、特に、本実施例では、電極本 体２１の上部外周側に流入口７と流出口８とを接続するバイパス管路２５を設け る構成としたから、アルコール混合ガソリンの大部分をベーパと共にバイパス管 路２５を介して流通させることができ、アルコール混合ガソリンに与える流動抵 抗を大幅に低減できる。Thus, in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. However, in particular, in the present embodiment, since the bypass conduit 25 that connects the inflow port 7 and the outflow port 8 is provided on the upper outer peripheral side of the electrode main body 21, most of the alcohol-mixed gasoline is used together with the vapor. It can be circulated through the bypass line 25, and the flow resistance given to the alcohol-blended gasoline can be greatly reduced.
【００３４】 また、ベーパもその大部分がバイパス管路２５を流通するから、検出用流路６ 内に侵入するベーパ量を少なくでき、該検出用流路６内にベーパが侵入した場合 でも、第１の実施例で述べた如く、アルコール混合ガソリンによって強制的に押 し出すことができるから、ベーパの滞在時間を短縮して、静電容量の検出精度を 大幅に向上することができる。Further, since most of the vapor also flows through the bypass pipe 25, the amount of vapor that enters the detection flow channel 6 can be reduced, and even when the vapor enters the detection flow channel 6, As described in the first embodiment, it can be forced out by the alcohol-blended gasoline, so that the residence time of the vapor can be shortened and the capacitance detection accuracy can be greatly improved.
【００３５】 なお、前記各実施例では、一側電極部２（２２）と他側電極部５（２４）とを それぞれ３個の電極で構成する場合を例に挙げて説明したが、本考案はこれに限 らず、各電極部を２個あるいは４個以上の電極から形成してもよい。In each of the embodiments, the case where each of the one-side electrode portion 2 (22) and the other-side electrode portion 5 (24) is composed of three electrodes has been described as an example. Is not limited to this, and each electrode portion may be formed of two or four or more electrodes.
【００３６】 また、前記各実施例では、アルコール混合液体としてのアルコール混合ガソリ ン中のアルコール濃度を検出する場合を例示したが、本考案はこれに限らず、ア ルコール混合ガソリンが重質であるか中質，軽質であるかを判別する性状判別セ ンサとしても用いることができ、さらには、食品，薬品等の他のアルコール混合 液体の静電容量検出にも適用できる。Further, in each of the above embodiments, the case where the alcohol concentration in the alcohol-mixed gasoline as the alcohol-mixed liquid is detected has been exemplified, but the present invention is not limited to this, and the alcohol-mixed gasoline is heavy. It can also be used as a property determination sensor to determine whether it is medium or light, and it can also be applied to the capacitance detection of other alcohol-mixed liquids such as foods and chemicals.
【００３７】[0037]
以上詳述した通り、本考案によれば、複数の電極を同軸筒状に配設してなる一 側電極部と他側電極部とを互い違いに組合わせることにより、該各電極部間に検 出用流路を形成する構成としたから、流入口から侵入したベーパをアルコール混 合液体によって強制的に流出口側に排出できる。この結果、各電極部間でベーパ が滞在する時間を効果的に短縮することができ、静電容量の検出精度や信頼性等 を向上することができる。 As described in detail above, according to the present invention, by alternately combining the one-side electrode part and the other-side electrode part, which are formed by arranging a plurality of electrodes in a coaxial cylindrical shape, the detection between the electrode parts is performed. Since the outlet channel is formed, the vapor that has entered from the inlet can be forcibly discharged to the outlet by the alcohol-mixed liquid. As a result, the time during which the vapor stays between the electrode portions can be effectively shortened, and the capacitance detection accuracy and reliability can be improved.
【００３８】 また、流入口と流出口とを接続するバイパス流路を設ける構成としたから、流 入口から流入したアルコール混合液体の大部分を、該バイパス流路を介して流出 口側に導くことができる。この結果、アルコール混合液体に与える流動抵抗を効 果的に低減でき、信頼性や使い勝手等を向上できる。Further, since the bypass channel connecting the inflow port and the outflow port is provided, most of the alcohol-mixed liquid flowing from the inflow port is guided to the outflow port side through the bypass flow channel. You can As a result, the flow resistance given to the alcohol mixed liquid can be effectively reduced, and the reliability and usability can be improved.
【図１】本考案の第１の実施例による静電容量センサを
示す縦断面図である。FIG. 1 is a vertical sectional view showing a capacitance sensor according to a first embodiment of the present invention.
【図２】図１中の矢示II−II方向を拡大して示す断面図
である。FIG. 2 is an enlarged cross-sectional view taken along line II-II in FIG.
【図３】本考案の第２の実施例による静電容量センサを
示す縦断面図である。FIG. 3 is a longitudinal sectional view showing a capacitance sensor according to a second embodiment of the present invention.
【図４】図３中の矢示IV−IV方向を拡大して示す断面図
である。FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV in FIG.
２，２２ 一側電極部 ５，２４ 他側電極部 ６ 検出用流路 ７ 流入口 ８ 流出口 ２５ バイパス管路（バイパス流路） 2,22 one side electrode part 5,24 other side electrode part 6 detection flow path 7 inflow port 8 outflow port 25 bypass pipe line (bypass flow path)
Claims (2)
側電極部と、該一側電極部に対向して設けられ、該一側
電極部の各電極と互い違いに組合わされる複数の電極を
同軸筒状に配設してなる他側電極部と、前記一側電極部
と該他側電極部との間に設けられ、内部にアルコール混
合液体を流通させる検出用流路と、該検出用流路の流入
側に設けられた流入口と、前記検出用流路の流出側に設
けられた流出口とから構成してなる静電容量センサ。1. A one-side electrode portion having a plurality of electrodes arranged in a coaxial cylindrical shape, and the one-side electrode portion is provided so as to face the one-side electrode portion and is alternately combined with each electrode of the one-side electrode portion. The other side electrode part having a plurality of electrodes arranged in a coaxial cylinder, and a detection channel provided between the one side electrode part and the other side electrode part, and through which an alcohol mixed liquid is circulated. A capacitance sensor comprising an inflow port provided on the inflow side of the detection flow channel and an outflow port provided on the outflow side of the detection flow channel.
ス流路を設けてなる請求項１に記載の静電容量センサ。2. The capacitance sensor according to claim 1, further comprising a bypass flow path connecting the inflow port and the outflow port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP285893U JPH0656765U (en) | 1993-01-08 | 1993-01-08 | Capacitance sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP285893U JPH0656765U (en) | 1993-01-08 | 1993-01-08 | Capacitance sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0656765U true JPH0656765U (en) | 1994-08-05 |
Family
ID=11541086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP285893U Pending JPH0656765U (en) | 1993-01-08 | 1993-01-08 | Capacitance sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0656765U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004125464A (en) * | 2002-09-30 | 2004-04-22 | Mitsui Mining & Smelting Co Ltd | Alcohol concentration detection device, alcohol concentration detection method using the same, and manufacturing method for alcohol concentration detection sensor |
| JP2012118023A (en) * | 2010-12-03 | 2012-06-21 | Maruboshi Su Kk | Insulator used for pressure-resistant container sensor for measuring dielectric property |
-
1993
- 1993-01-08 JP JP285893U patent/JPH0656765U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004125464A (en) * | 2002-09-30 | 2004-04-22 | Mitsui Mining & Smelting Co Ltd | Alcohol concentration detection device, alcohol concentration detection method using the same, and manufacturing method for alcohol concentration detection sensor |
| JP2012118023A (en) * | 2010-12-03 | 2012-06-21 | Maruboshi Su Kk | Insulator used for pressure-resistant container sensor for measuring dielectric property |
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