JP2020128943A - Liquid level measuring device - Google Patents

Liquid level measuring device Download PDF

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JP2020128943A
JP2020128943A JP2019022118A JP2019022118A JP2020128943A JP 2020128943 A JP2020128943 A JP 2020128943A JP 2019022118 A JP2019022118 A JP 2019022118A JP 2019022118 A JP2019022118 A JP 2019022118A JP 2020128943 A JP2020128943 A JP 2020128943A
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JP7177482B2 (en
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與宗治 丹治
Yosoji Tanji
與宗治 丹治
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  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

To provide a liquid level measuring device capable of measuring the liquid surface level of liquid accumulated in containers or tubes of various shapes.SOLUTION: A liquid level device 10 includes: a sensor part 12 which is entered into liquid; and a head part 14 in which a measurement circuit is housed. The sensor part 12 is entered into a container or a tube while holding the head part 14. The sensor part 12 includes: a tubular first insulator 16; a first electrode 18 disposed on an outer periphery of the first insulator 16; and a second electrode 20 disposed inside the first insulator 16. Since the first electrode 18 and the second electrode 20 are bent, the electrodes 18, 20 can be inserted into the curved tube or container.SELECTED DRAWING: Figure 1

Description

本発明は、静電容量を用いて液体の液面レベルを測定する液面レベル測定装置に関するものである。 The present invention relates to a liquid level measuring device that measures a liquid level of a liquid using capacitance.

従来、静電容量を用いた液面レベル測定装置が開発・開示されている。下記の特許文献１の液面レベル測定装置は、ステンレスまたはチタンなどで形成された一対の電極を備える。それらの電極は円筒形と棒状になっている。電極間の液面レベルによって静電容量が変化するため、測定される静電容量によって液面レベルを測定している。 Conventionally, a liquid level measuring device using capacitance has been developed and disclosed. The liquid level measuring device of Patent Document 1 described below includes a pair of electrodes formed of stainless steel, titanium, or the like. The electrodes are cylindrical and rod-shaped. Since the capacitance changes depending on the liquid level between the electrodes, the liquid level is measured by the measured capacitance.

たとえば、図４に示すように、自動車の燃料タンク４４には、数カ所で曲げられた燃料供給管４６とガス抜き管４８が繋げられている。燃料供給管４６の中に溜まった燃料の液面レベルを測定しようとした場合、燃料供給管４６の形状に合わせた電極が必要であるが、特許文献１はそのような曲がった管に対応した電極を有さない。当初から曲げられた電極を製造することが考えられるが、燃料供給管４６の曲がり方によっては、電極を燃料供給管４６の中に挿入することができない。また、自動車の種類によって燃料供給管４６の形状が異なるため、車種ごとに曲げられた電極を製造していては不経済であるため、１つの液面レベル測定装置で種々の車種に対応できる必要がある。曲がった管は燃料供給管４６に限定されず、たとえばブルドーザー等の油圧装置の作動油タンクに作動油を注ぐための注入管も曲がった管である。その注入管に入っている作動油の液面レベルを測定するのも燃料供給管４６と同様に難しい。 For example, as shown in FIG. 4, a fuel tank 44 of an automobile is connected with a fuel supply pipe 46 and a degassing pipe 48 which are bent at several places. When it is attempted to measure the liquid level of the fuel accumulated in the fuel supply pipe 46, an electrode matching the shape of the fuel supply pipe 46 is required, but Patent Document 1 corresponds to such a bent pipe. It has no electrodes. Although it is conceivable to manufacture a bent electrode from the beginning, the electrode cannot be inserted into the fuel supply pipe 46 depending on how the fuel supply pipe 46 is bent. Further, since the shape of the fuel supply pipe 46 varies depending on the type of vehicle, it is uneconomical to manufacture a bent electrode for each vehicle type. Therefore, one liquid level measuring device needs to be able to handle various vehicle types. There is. The bent pipe is not limited to the fuel supply pipe 46, and the injection pipe for pouring the working oil into the working oil tank of a hydraulic device such as a bulldozer is also a bent pipe. As with the fuel supply pipe 46, it is difficult to measure the liquid level of the hydraulic oil contained in the injection pipe.

特開２００６−０３８６９９号公報JP, 2006-038699, A

本発明の目的は、種々の形状の容器または管に溜まった液体の液面レベルを測定できる液面レベル測定装置を提供することにある。 An object of the present invention is to provide a liquid level measuring device capable of measuring the liquid level of a liquid accumulated in various shapes of containers or tubes.

本発明の液面レベル測定装置は、柔軟性を有する管状の第１絶縁体と、前記第１絶縁体の外周にらせん状に巻きまわされ、または直線状になっており、第１絶縁体の形状変化に応じて形状が変化し、アース電位になった第１電極と、前記第１絶縁体の内方に配置され、第１絶縁体の形状変化に応じて形状が変化し、前記第１電極と間隔を有して対になる第２電極と、前記第２電極に所定電位を印加し、第２電極の電位から第１電極と第２電極の間にある液体の液面レベルを求める測定回路とを備える。 The liquid level measuring device of the present invention comprises a flexible first tubular insulator, and a spirally wound or straight line around the outer periphery of the first insulator. The first electrode, which is changed in shape according to the change in shape and is at the ground potential, is arranged inside the first insulator, and the shape is changed in accordance with the change in shape of the first insulator. A predetermined potential is applied to the second electrode, which is paired with the electrode with a space, and the second electrode, and the liquid level of the liquid between the first electrode and the second electrode is obtained from the potential of the second electrode. And a measurement circuit.

第１絶縁体が変形すると、第１電極および第２電極も第１絶縁体に合わせて変形する。測定回路は第２電極に電流を流し、第２電極の電位から第１電極と第２電極の間にある液体の液面レベルを求める。 When the first insulator is deformed, the first electrode and the second electrode are also deformed according to the first insulator. The measuring circuit applies a current to the second electrode and determines the liquid level of the liquid between the first electrode and the second electrode from the potential of the second electrode.

本発明によると、第１絶縁体が変形することで第１電極と第２電極が変形される。曲がった容器または管に第１電極と第２電極を挿入することができ、その容器または管に溜まった液体の液面レベルを求めることができる。第１電極と第２電極が種々の形状に曲げられるため、種々の形状の容器または管に溜められた液体の液面レベルを測定することができる。 According to the present invention, the deformation of the first insulator deforms the first electrode and the second electrode. The first electrode and the second electrode can be inserted into a bent container or tube, and the liquid level of the liquid accumulated in the container or tube can be determined. Since the first electrode and the second electrode are bent into various shapes, it is possible to measure the liquid level of the liquid stored in the containers or tubes having various shapes.

本願の液面レベル測定装置の外観を示す図である。It is a figure which shows the external appearance of the liquid level measuring device of this application. 本願のセンサー部の構造を示す断面図である。It is sectional drawing which shows the structure of the sensor part of this application. 本願のヘッド部の構成を示す図である。It is a figure which shows the structure of the head part of this application. 自動車に使用される燃料供給管の一例を示す図である。It is a figure which shows an example of the fuel supply pipe used for a motor vehicle.

本発明の液面レベル測定装置について図面を使用して説明する。 The liquid level measuring device of the present invention will be described with reference to the drawings.

図１に示す本発明の液面レベル装置１０は、液体の中に入れられるセンサー部１２および測定回路が収納されたヘッド部１４を備える。ヘッド部１４を持ちながらセンサー部１２を容器または管に入れる。たとえばセンサー部１２は、図４に示した燃料供給管４６などの曲がった管または容器に入れられる。 A liquid level device 10 of the present invention shown in FIG. 1 includes a head portion 14 in which a sensor portion 12 and a measuring circuit to be put in a liquid are stored. While holding the head portion 14, the sensor portion 12 is put in a container or a tube. For example, the sensor portion 12 is contained in a bent tube or container such as the fuel supply tube 46 shown in FIG.

図２に示すように、センサー部１２は、管状の第１絶縁体１６、第１絶縁体１６の外周に配置された第１電極１８、第１絶縁体１６の内方に配置された第２電極２０を備える。 As shown in FIG. 2, the sensor unit 12 includes a tubular first insulator 16, a first electrode 18 arranged on the outer periphery of the first insulator 16, and a second electrode 18 arranged inside the first insulator 16. The electrode 20 is provided.

第１絶縁体１６は管状になっており、その断面は円、楕円、四角形など限定されない。第１絶縁体１６は柔軟性を有した絶縁体であり、第１絶縁体１６を曲げて任意形状に変形させることができる。第１絶縁体１６の材料としてゴム、ポリ塩化ビニル、ポリエチレンなどの絶縁体が挙げられる。第１絶縁体１６が任意形状の管に入ると、第１絶縁体１６はその管の形状に合わせて曲がる。たとえば図４に示す自動車の燃料供給管４６に第１絶縁体１６を入れることができる。 The first insulator 16 has a tubular shape, and its cross section is not limited to a circle, an ellipse, a quadrangle, or the like. The first insulator 16 is a flexible insulator, and the first insulator 16 can be bent and deformed into an arbitrary shape. Examples of the material of the first insulator 16 include rubber, polyvinyl chloride, polyethylene, and other insulators. When the first insulator 16 enters a tube having an arbitrary shape, the first insulator 16 bends according to the shape of the tube. For example, the first insulator 16 can be put in the fuel supply pipe 46 of the automobile shown in FIG.

第１電極１８は変形可能な線状または帯状の導体である。たとえば、第１電極１８と第２電極２０でコンデンサを形成できるのであれば、第１電極１８の太さは限定されない。第１電極１８の材料として銅、アルミニウム、金、銀などの金属が挙げられる。第１電極１８は第１絶縁体１６の外周に巻きまわされて、らせん状になっている。第１絶縁体１６の外周にらせん状の凸部２２を形成することで、凸部２２の間がらせん状の凹部２４になっている。第１絶縁体１６が直線状になった状態で、凹部２４のピッチは一定である。この凹部２４に第１電極１８が入れられている。 The first electrode 18 is a deformable linear or strip conductor. For example, the thickness of the first electrode 18 is not limited as long as a capacitor can be formed by the first electrode 18 and the second electrode 20. Examples of the material of the first electrode 18 include metals such as copper, aluminum, gold and silver. The first electrode 18 is wound around the outer periphery of the first insulator 16 and has a spiral shape. By forming the spiral convex portions 22 on the outer periphery of the first insulator 16, the spiral concave portions 24 are formed between the convex portions 22. The pitch of the recesses 24 is constant when the first insulator 16 is linear. The first electrode 18 is placed in the recess 24.

第１絶縁体１６は凹部２４が形成されていることで、曲げやすくなっている。第１絶縁体１６が曲がると、第１電極１８も第１絶縁体１６に合わせて曲がる。第１電極１８はらせん状になっているため、第１電極１８は曲がることができる。なお、特許文献１においては対応する電極は円筒状になっているため、曲がることは無かった。第１電極１８が曲がる際、第１電極１８が凹部２４に入れられていることで、第１電極１８が第１絶縁体１６に合わせて曲がることができ、第１絶縁体１６が元の状態（直線状）に戻った時、第１電極１８も元の状態に戻ることができる。凹部２４に合わせて第１電極１８を巻きまわせばよく、製造しやすくなっている。 Since the first insulator 16 is formed with the recess 24, it is easy to bend. When the first insulator 16 bends, the first electrode 18 also bends according to the first insulator 16. Since the first electrode 18 has a spiral shape, the first electrode 18 can bend. Incidentally, in Patent Document 1, since the corresponding electrode has a cylindrical shape, it was not bent. When the first electrode 18 bends, the first electrode 18 is placed in the recess 24, so that the first electrode 18 can bend in accordance with the first insulator 16, and the first insulator 16 is in the original state. When returning to (straight), the first electrode 18 can also return to its original state. It suffices to wind the first electrode 18 in accordance with the recess 24, which facilitates manufacturing.

凹部２４の幅は第１電極１８の断面よりも大きくし、第１電極１８が凹部２４の中に入れられた状態で第１電極１８と凸部２２の間に隙間ができるようにする。第１絶縁体１６が曲がると第１電極１８も曲がるが、凹部２４の中で第１電極１８が多少移動でき、第１電極１８の曲げられた部分に生じるテンションが低く抑えられ、第１電極１８の断線を防ぐことができる。 The width of the recess 24 is made larger than the cross section of the first electrode 18, so that a gap is formed between the first electrode 18 and the protrusion 22 in a state where the first electrode 18 is put in the recess 24. When the first insulator 16 bends, the first electrode 18 also bends, but the first electrode 18 can move a little in the recess 24, and the tension generated in the bent portion of the first electrode 18 is suppressed to a low level. It is possible to prevent the disconnection of 18.

第２電極２０は第１絶縁体１６の内部空間２６に配置されている。第２電極２０は線状または帯状の導体である。第１電極１８と第２電極２０は同一材料であってもよい。第１電極１８と第２電極２０が一対になっており、その２つの電極１８、２０でコンデンサを形成する。第２電極２０は変形可能であり、第１絶縁体１６が曲がると第２電極２０は第１絶縁体１６の内壁３０に押されて曲がる。第１絶縁体１６があることで第１電極１８と第２電極２０が接触せず、両電極１８、２０でコンデンサを形成し続けることができる。図２のように、線状または帯状になった複数の導体２８をより合わせたり編んだりして第２電極２０にしてもよい。複数の導体２８をより合わせたり編んだりすることで第２電極２０に復元力が備えられ、第２電極２０が曲げられた後、元の状態に戻ることができる。 The second electrode 20 is arranged in the internal space 26 of the first insulator 16. The second electrode 20 is a linear or strip conductor. The first electrode 18 and the second electrode 20 may be made of the same material. The first electrode 18 and the second electrode 20 are paired, and the two electrodes 18 and 20 form a capacitor. The second electrode 20 is deformable, and when the first insulator 16 bends, the second electrode 20 is pushed by the inner wall 30 of the first insulator 16 and bends. Due to the presence of the first insulator 16, the first electrode 18 and the second electrode 20 do not come into contact with each other, and the capacitor can be continuously formed by the both electrodes 18, 20. As shown in FIG. 2, a plurality of linear or strip conductors 28 may be twisted or knitted together to form the second electrode 20. The second electrode 20 is provided with a restoring force by twisting or knitting the plurality of conductors 28, and the second electrode 20 can be returned to its original state after being bent.

センサー部１２を燃料供給管４６などの管に挿入すると、管の中に液体があれば、センサー部１２（第１絶縁体１６）の先端３２から液体の中に入っていく。センサー部１２、すなわち第１絶縁体１６の先端３２は開口しており、内部空間２６の中に液体が入っていく。液体の液面レベルと同じ位置まで内部空間２６の中に液体が入る。第１電極１８と第２電極２０でコンデンサを形成しているため、液体が入る量によって電極１８、２０の間の静電容量が変化するため、その静電容量を利用して液面レベルを求めることができる。 When the sensor unit 12 is inserted into a pipe such as the fuel supply pipe 46, if liquid exists in the pipe, the liquid enters from the tip 32 of the sensor unit 12 (first insulator 16) into the liquid. The sensor portion 12, that is, the tip 32 of the first insulator 16 is open, and the liquid enters the internal space 26. The liquid enters the internal space 26 to the same position as the liquid surface level. Since the first electrode 18 and the second electrode 20 form a capacitor, the electrostatic capacitance between the electrodes 18 and 20 changes depending on the amount of liquid entering. You can ask.

第１絶縁体１６と第２電極２０の間にスペーサー（図示せず）を設けて、第１絶縁体１６と第２電極２０の間隔が常に一定になるようにしてもよい。 A spacer (not shown) may be provided between the first insulator 16 and the second electrode 20 so that the distance between the first insulator 16 and the second electrode 20 is always constant.

第１電極１８がアース電位であり、第２電極２０に所定電位が印加される。各電極１８、２０の表面はフッ素樹脂などでコーティングし、各電極１８、２０が液体によって腐食しにくくしてもよい。 The first electrode 18 is at ground potential, and a predetermined potential is applied to the second electrode 20. The surfaces of the electrodes 18 and 20 may be coated with a fluororesin or the like to prevent the electrodes 18 and 20 from being corroded by the liquid.

センサー部１２は、第１絶縁体１６および第１電極１８を一緒に覆う第２絶縁体３４を備える。第２絶縁体３４は第１絶縁体１６と同様の柔軟性を有する絶縁体である。第２絶縁体３４があることによって、第１電極１８が燃料供給管４６に直接接することは無く、第１電極１８によって燃料供給管４６を傷つけることは無い。 The sensor unit 12 includes a second insulator 34 that covers the first insulator 16 and the first electrode 18 together. The second insulator 34 is an insulator having the same flexibility as the first insulator 16. Due to the presence of the second insulator 34, the first electrode 18 does not come into direct contact with the fuel supply pipe 46, and the fuel supply pipe 46 is not damaged by the first electrode 18.

第１絶縁体１６と第２絶縁体３４を貫通する穴（図示せず）を設けてもよい。穴があることで第１絶縁体１６の内部空間２６が第１絶縁体１６および第２絶縁体３４の外部と繋がり、第１絶縁体１６の先端３２から内部空間２６に液体が入りやすくなる。穴の数は１つに限定されず、複数設けてもよい。穴の形状も丸、楕円、四角など種々の形状であってもよい。第１絶縁体１６と第２絶縁体３４の一部または全部を網目状にすることで、第１絶縁体１６と第２絶縁体３４に穴を形成してもよい。 You may provide the hole (not shown) which penetrates the 1st insulator 16 and the 2nd insulator 34. Due to the presence of the holes, the internal space 26 of the first insulator 16 is connected to the outside of the first insulator 16 and the second insulator 34, and the liquid easily enters the internal space 26 from the tip 32 of the first insulator 16. The number of holes is not limited to one, and a plurality of holes may be provided. The shape of the hole may be various shapes such as a circle, an ellipse, and a square. A hole may be formed in the first insulator 16 and the second insulator 34 by forming a part or all of the first insulator 16 and the second insulator 34 in a mesh shape.

第２絶縁体３４に導電体粉が混入されていてもよい。第２絶縁体３４の表面が導電体粉を介して第１電極１８に接続されることで、第２絶縁体３４の表面がアース電位になる。そのため、第２絶縁体３４と燃料供給管４６がこすれて静電気を生じても、静電気はアースに流される。燃料タンク４４と燃料供給管４６には引火性液体の燃料が溜められるが、燃料供給管４６内で静電気による発火が防止される。 Conductor powder may be mixed in the second insulator 34. The surface of the second insulator 34 is connected to the first electrode 18 via the conductor powder, so that the surface of the second insulator 34 becomes the ground potential. Therefore, even if the second insulator 34 and the fuel supply pipe 46 rub against each other to generate static electricity, the static electricity is flowed to the ground. Flammable liquid fuel is stored in the fuel tank 44 and the fuel supply pipe 46, but ignition due to static electricity is prevented in the fuel supply pipe 46.

測定回路３６は、第１電極１８と第２電極２０の間にある液面の液面レベルを測定する回路である（図３）。測定回路３６はヘッド部１４を構成する筐体３８の中に収納されている。測定回路３６の基準電位としてアース電位に接続するのであれば、そのアース電位に第１電極１８を接続してもよい。 The measurement circuit 36 is a circuit for measuring the liquid level of the liquid surface between the first electrode 18 and the second electrode 20 (FIG. 3). The measurement circuit 36 is housed in a housing 38 that constitutes the head unit 14. If the reference potential of the measuring circuit 36 is connected to the ground potential, the first electrode 18 may be connected to the ground potential.

測定回路３６は、高周波発振をおこなって第２電極２０に電圧を印加し、第２電極２０の電位を測定する。電極１８、２０の間にある液体の液面レベルによって静電容量が異なり、その静電容量によって測定される電位が異なる。そのため、測定回路３６は測定された第２電極２０の電位に応じた信号を液面レベルとして出力する。たとえば測定回路３６の具体例として、従来技術で説明した特許文献１の回路であってもよいが、第２電極２０の電位が測定できれば特に限定されない。 The measurement circuit 36 oscillates at high frequency to apply a voltage to the second electrode 20 and measure the potential of the second electrode 20. The capacitance varies depending on the liquid level of the liquid between the electrodes 18 and 20, and the measured potential varies depending on the capacitance. Therefore, the measurement circuit 36 outputs a signal corresponding to the measured potential of the second electrode 20 as the liquid surface level. For example, as a specific example of the measurement circuit 36, the circuit of Patent Document 1 described in the related art may be used, but it is not particularly limited as long as the potential of the second electrode 20 can be measured.

測定回路３６が測定した第２電極２０の電位はマイコン４０などのコンピュータに入力してもよい。マイコン４０は入力された電位に基づいて図１に示す複数の発光ダイオード４２を点灯させる。液面レベルに応じて発光する発光ダイオード４２の数を変更することで、液面レベルを操作者に示す。発光ダイオード４２の代わりに液晶ディスプレイなどの表示装置を使用し、液面レベルを表示してもよい。 The potential of the second electrode 20 measured by the measuring circuit 36 may be input to a computer such as the microcomputer 40. The microcomputer 40 turns on the plurality of light emitting diodes 42 shown in FIG. 1 based on the input potential. The liquid level is shown to the operator by changing the number of light emitting diodes 42 that emit light according to the liquid level. Instead of the light emitting diode 42, a display device such as a liquid crystal display may be used to display the liquid level.

以上のように、本願の液面レベル測定装置１０は、第１電極１８と第２電極２０が曲がるため、それらの電極１８、２０を自動車の燃料供給管４６や油圧装置の作動油タンクへ作動油を注ぐための注入管のような曲がった管または容器に挿入することができる。電極１８、２０は自由に曲げられるため、種々の形状の管または容器に電極１８、２０を挿入することができる。従来、計測できなかった管または容器に入れられた液体の液面レベルを測定することができる。 As described above, in the liquid level measuring device 10 of the present application, since the first electrode 18 and the second electrode 20 are bent, the electrodes 18 and 20 are operated to the fuel supply pipe 46 of the automobile or the hydraulic oil tank of the hydraulic system. It can be inserted into a bent tube or container, such as an injection tube for pouring oil. The electrodes 18, 20 can be freely bent, so that the electrodes 18, 20 can be inserted into various shapes of tubes or containers. It is possible to measure the liquid level of a liquid contained in a pipe or a container that cannot be measured conventionally.

以上、本発明の一実施形態を説明したが、本願は上記の実施形態に限定されるものではない。たとえば、第１絶縁体１６が曲げられるのであれば、凸部２２と凹部２４は省略し、単なる筒にすることも可能である。第１電極１８は第１絶縁体１６の長軸に沿った直線状であってもよい。第１絶縁体１６の外周に第１電極１８が入る凹部を形成し、第１電極１８の形状が維持されるようにしてもよい。また、第２電極２０は複数の導体２８をより合わせたりせず、１本の直線状の導体２８をそのまま使用したり、らせん状にして使用することも可能である。 Although one embodiment of the present invention has been described above, the present application is not limited to the above embodiment. For example, if the first insulator 16 is bendable, the convex portion 22 and the concave portion 24 may be omitted, and a simple cylinder may be used. The first electrode 18 may be linear along the long axis of the first insulator 16. A concave portion into which the first electrode 18 is inserted may be formed on the outer periphery of the first insulator 16 so that the shape of the first electrode 18 is maintained. In addition, the second electrode 20 may be formed by using a single linear conductor 28 as it is without twisting a plurality of conductors 28 together or by using it in a spiral shape.

検出する液体が引火性液体でなければ、上記のような第２絶縁体３４を省略することも可能である。 If the liquid to be detected is not a flammable liquid, it is possible to omit the second insulator 34 as described above.

その他、本発明は、その主旨を逸脱しない範囲で当業者の知識に基づき種々の改良、修正、変更を加えた態様で実施できるものである。 In addition, the present invention can be implemented in a mode in which various improvements, modifications and changes are made based on the knowledge of those skilled in the art without departing from the spirit of the invention.

１０：液面レベル測定装置
１２：センサー部
１４：ヘッド部
１６：第１絶縁体
１８：第１電極
２０：第２電極
２２：らせん状の凸部
２４：らせん状の凹部
２６：第１絶縁体の内部空間
２８：導体
３０：第１絶縁体の内壁
３２：センサー部（第１絶縁体）の先端
３４：第２絶縁体
３６：測定回路
３８：筐体
４０：マイコン
４２：発光ダイオード 10: Liquid level measuring device 12: Sensor part 14: Head part 16: First insulator 18: First electrode 20: Second electrode 22: Spiral convex part 24: Spiral concave part 26: First insulator Inner space 28: conductor 30: inner wall of first insulator 32: tip of sensor part (first insulator) 34: second insulator 36: measurement circuit 38: housing 40: microcomputer 42: light emitting diode

Claims (4)

柔軟性を有する管状の第１絶縁体と、
前記第１絶縁体の外周にらせん状に巻きまわされ、または直線状になっており、第１絶縁体の形状変化に応じて形状が変化し、アース電位になった第１電極と、
前記第１絶縁体の内方に配置され、第１絶縁体の形状変化に応じて形状が変化し、前記第１電極と間隔を有して対になる第２電極と、
前記第２電極に所定電位を印加し、第２電極の電位から第１電極と第２電極の間にある液体の液面レベルに応じた信号を出力する測定回路と、
を備えた液面レベル測定装置。 A tubular first insulator having flexibility,
A first electrode, which is spirally wound around the outer periphery of the first insulator or has a linear shape, the shape of which changes in accordance with the change of the shape of the first insulator and which is at ground potential;
A second electrode disposed inside the first insulator, the shape of which changes in accordance with the change of the shape of the first insulator, and which is paired with the first electrode with a space therebetween;
A measurement circuit that applies a predetermined potential to the second electrode and outputs a signal from the potential of the second electrode according to the liquid level of the liquid between the first electrode and the second electrode;
Liquid level measuring device equipped with. 前記第１絶縁体および第１電極を一緒に覆う第２絶縁体と、
前記第２絶縁体に混入された導電体粉と、
を備えた請求項１の液面レベル測定装置。 A second insulator covering the first insulator and the first electrode together;
Conductor powder mixed in the second insulator,
The liquid level measuring device according to claim 1, further comprising: 前記第１絶縁体および第２絶縁体を貫通する穴を備えた請求項２の液面レベル測定装置。 The liquid level measuring device according to claim 2, further comprising a hole penetrating the first insulator and the second insulator. 前記第１電極がらせん状の場合、前記第１絶縁体の外周に形成されたらせん状の凹部を備え、該凹部に第１電極が入れられた請求項１から３のいずれかの液面レベル測定装置。 The liquid level according to any one of claims 1 to 3, wherein when the first electrode has a spiral shape, a spiral recess is formed on the outer periphery of the first insulator, and the first electrode is placed in the recess. measuring device.
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