JPS5842926A - Electrostatic capacity type oil level gauge - Google Patents
Electrostatic capacity type oil level gaugeInfo
- Publication number
- JPS5842926A JPS5842926A JP56139788A JP13978881A JPS5842926A JP S5842926 A JPS5842926 A JP S5842926A JP 56139788 A JP56139788 A JP 56139788A JP 13978881 A JP13978881 A JP 13978881A JP S5842926 A JPS5842926 A JP S5842926A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- tank
- electrode
- oil level
- drain
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はタンク内油醋を検出すると共に、タンクの底部
に溜るドレンも検出できるようにした静電容量式液面計
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capacitive liquid level gauge that is capable of detecting not only oil in a tank but also drain accumulated at the bottom of the tank.
周知の如く静電容量式液面計は測定しようとする液体中
に２本の電極を挿入し、この挿入した電極間の静電容儲
が液面の深さに比例することを利用して液面すなわち液
量を測定するものである。As is well known, a capacitive liquid level gauge inserts two electrodes into the liquid to be measured, and uses the fact that the capacitance between the inserted electrodes is proportional to the depth of the liquid level to measure the liquid level. It is used to measure the area, that is, the amount of liquid.
ところで、タンクにガソリンなとの油を貯蔵していると
、空気に触れるタンク壁に゛は気温の差などにより、空
気中の水分か結露してドレンとなり、この水分が油より
比重が大きいためタンクの底部に溜るので、この−〇た
ドレンの鯵が一定になると、１−レン抜きしなければな
らない。そこでこのドレン憾も検出する心髄かある。こ
のように油面の測定或いはドレン−の検出に静電容＃１
Ａｊ（液面針を用いると、囲動ａｔ分かないので、保守
か容易て寿命が長く、検出に使用・する電気−■−ネル
Ｖが小さく爆発性雰囲気中でも白太のおそれがない乙と
の特色を有するけれども、静電容−の軸台な測定（こは
同軸ケーブルを信号線としなければならないのぐ高価に
なるという欠点を有する。しかもドシン量の検出用電極
はタンク底部に設けられるので、電極からの信号線はタ
ンクの油中を通って外部へ導かれ、従って同軸ケーブル
が油により劣化するという欠点があった。また油中をグ
ー１ルか通るので、その結果静電容Ｉ値が変化し、正確
な計測ができなくなるという欠点もあった。By the way, when oil such as gasoline is stored in a tank, moisture in the air condenses on the tank wall that comes into contact with the air due to differences in temperature, and this moisture has a higher specific gravity than the oil. It collects at the bottom of the tank, so when the amount of drain reaches a certain level, you have to drain it out. Therefore, it is essential to detect this drain problem. In this way, capacitance #1 is used for oil level measurement or drain detection.
Aj (When using a liquid level needle, there is no circulatory movement at, so maintenance is easy and the life is long. Although it has the characteristics, it has the disadvantage that it is expensive because it requires a coaxial cable as the signal line.Moreover, the electrode for detecting the amount of dosing is installed at the bottom of the tank, so The signal line from the electrode is led to the outside through the oil in the tank, which has the disadvantage that the coaxial cable deteriorates due to the oil.Also, since it passes through the oil, the capacitance I value decreases. It also had the disadvantage that it could change and make accurate measurements impossible.
したがって本発明は、Ｌ紀したような欠点を解消し、簡
単な構成で１確にトレン蝙も検知４できる静電容量式油
面計を提供する゛ことを目的とするものである。そして
本発明によればドレン量検出電極に接続された信号線は
空気中を通ってタンク外へ導くようになっている。した
がって信号線は油に触れないので、ケーブルの劣化が起
こらず、またタンク内の油量による静電容量値が変化し
ない。SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a capacitive oil level gauge which eliminates the above-mentioned drawbacks and is capable of accurately detecting trench flies with a simple configuration. According to the present invention, the signal line connected to the drain amount detection electrode is led out of the tank through the air. Therefore, the signal line does not come into contact with oil, so the cable does not deteriorate, and the capacitance value does not change depending on the amount of oil in the tank.
また信号線を金属管中に通し、以て油による静電容量の
変化を防止すると、高価な同軸ケーブルに代えて普通の
ビニール線が使用できコストの低減にも寄与するもので
ある。Furthermore, by passing the signal line through a metal tube to prevent changes in capacitance due to oil, ordinary vinyl wires can be used instead of expensive coaxial cables, which also contributes to cost reduction.
以下図面を参照して、本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.
第１図は、本発明を実施した油面計が給油所の地下タン
クに適用されている例を示すものであり、地表Ｇの下方
に埋設されたタンク１は油面測定用電極２０が挿入され
、その下、方でタンクの底部２近□
くにはドレン量検出用電極３０が設けられている。FIG. 1 shows an example in which an oil level gauge embodying the present invention is applied to an underground tank at a gas station, and a tank 1 buried below the ground surface G has an oil level measuring electrode 20 inserted therein. Below that, near the bottom 2 of the tank, an electrode 30 for detecting the amount of drain is provided.
そして詳しくは後述するが、これら電極に接続された信
＠線はタンクの上方へ導かれて変換器すなわち１０発振
器３に接続され、１０発振器において静電容量は周波数
に弯換されそしてライン４を介して表示計５に液面又は
液醋として表示されている。またタンク１には吸引管６
が挿入されており、図示されないポンプが起動されると
、ノズル７から周知Φ態様で給油作業が行なわれるよう
になっている。なお第１図申付号８はスタンドであり、
９は給油饅或いは金額等を表示する表示装置を示してい
る。As will be described in detail later, the signal lines connected to these electrodes are led above the tank and connected to a converter, ie, a 10 oscillator 3, where the capacitance is converted to a frequency, and the line 4 is It is displayed on the display meter 5 as the liquid level or liquid alcohol. In addition, the tank 1 has a suction pipe 6
is inserted, and when a pump (not shown) is started, oil is supplied from the nozzle 7 in a well-known manner. In addition, Figure 1 Application No. 8 is a stand,
Reference numeral 9 indicates a display device for displaying the refueling bun, the price, etc.
さて第２図および第３図を参照すると、本発明を実施し
た静電容量式油面計が示されており、この静電容量式油
面計は油面測定用電極２０とドレン量検出電極３０とか
ら成り、電極３０からの信号線３８はタンク中の油とは
接触しないようにしてタンク外へ導かれている。Now, referring to FIGS. 2 and 3, a capacitive oil level gauge embodying the present invention is shown, and this capacitive oil level gauge includes an oil level measuring electrode 20 and a drain amount detecting electrode. 30, and a signal line 38 from the electrode 30 is led out of the tank so as not to come into contact with the oil in the tank.
油面測定用電極２０は完全に絶縁されしかもアースされ
た金属円筒よりなる外極２１と、この外極の中に同心的
に配されたステンレス綱などの金属棒状の内極２２とか
ら□なっている。内極２２は、外極２１の上下端部に嵌
入されたエポキシ樹脂等の絶縁活栓２３．２４に支持さ
れ、そして内極２２は信号線２５によって１０発振器３
と接続されている。また外極２１の下方部分には油の流
入口２６が、そして上方部分には空気抜き孔２７が形成
されている。従ってタンク２内の油は外極２１内に自由
に流入口２６から流入或いは流出して、外極の内部の油
面はタンク内の油面と常に同一レベルになる。The oil level measuring electrode 20 consists of an outer pole 21 made of a metal cylinder that is completely insulated and grounded, and an inner pole 22 made of a metal rod such as stainless steel wire arranged concentrically within the outer pole. ing. The inner pole 22 is supported by insulating stopcocks 23 and 24 made of epoxy resin or the like fitted into the upper and lower ends of the outer pole 21, and the inner pole 22 is connected to the 10 oscillator 3 by a signal line 25.
is connected to. Further, an oil inlet 26 is formed in the lower part of the outer pole 21, and an air vent hole 27 is formed in the upper part. Therefore, the oil in the tank 2 freely flows into or out of the inlet 26 into the outer pole 21, and the oil level inside the outer pole is always at the same level as the oil level in the tank.
ドレン量検出電極３０も、内外の２極から構成されるが
、図示の実施例では外＃Ａ３１は油面測定用外極２１と
共用されている。すなわち外極２１は下方へ延びてドレ
ン曇検出外極３１となっている。または絶縁材２４も共
用されて、内極３２の上方端を支持している。トレン量
検出電極の内極３２の下方端は外極３１に挿入された絶
縁活栓３３により支持されている。外極３１には上下方
向に長いスリット状の連通孔３４が形成され、油或いは
水が自由に外極３１の内部へ出入できるようになってい
る。油面測定用電極２０の外極２１に沿って導電体の金
属パイプ３５が設けられている。そしてこのパイプ３５
が油流入防止をした管を構成している。すなわちパイプ
３５の上下端は外極２１にエポキシ樹脂でモールディン
グ３６．３７されて、パイプ３５の内部は空気が密封さ
れ、油は浸入できないようになっている。そしてこのパ
イプ３５中に信号線３８か挿入され、上方の端部は１Ｃ
発振器３に接続され、下方の端部は外極を興通しドレン
量検出電極の内極３２に接続されている。The drain amount detection electrode 30 is also composed of two inner and outer poles, but in the illustrated embodiment, the outer #A31 is also used as the outer pole 21 for oil level measurement. That is, the outer pole 21 extends downward to become a drain fog detection outer pole 31. Alternatively, the insulating material 24 is also used to support the upper end of the inner pole 32. The lower end of the inner pole 32 of the Tonne amount detection electrode is supported by an insulating stopcock 33 inserted into the outer pole 31. A vertically long slit-like communication hole 34 is formed in the outer pole 31 so that oil or water can freely enter and exit the outer pole 31 . A conductive metal pipe 35 is provided along the outer pole 21 of the oil level measuring electrode 20. And this pipe 35
constitutes a pipe that prevents oil from entering. That is, the upper and lower ends of the pipe 35 are molded 36 and 37 onto the outer pole 21 with epoxy resin, so that the inside of the pipe 35 is sealed against air and oil cannot enter. A signal line 38 is inserted into this pipe 35, and the upper end is 1C.
It is connected to the oscillator 3, and its lower end is connected to the inner pole 32 of the drain amount detection electrode through the outer pole.
本発明に係る静電容−油面計は以トのように構成されい
るので、内外電極２１．２２．３１．３２間の静電容器
の変化により、油面及びトレン鮒が検出或いは測定でき
るが、本発明によると、油面測定用電極に接続された信
号線２５は勿論のこと、トレン量検出電極に接続された
信り線３８も、タンク中の油に接触しないようにしてタ
ンク外の１０発振器３に接続されているので、油がビニ
ールと金属線との間に浸透するようなことはなく、かつ
測定された静電容量が、信号線部分で変化することがな
い。従って静電容量値は正確に測定でき、油面及び水鏝
を正確に測定できる。また信号線は空気中でタンク外へ
導かれるために、油による劣化を受けないので寿命が長
くなるという利点も有する。Since the capacitance-oil level gauge according to the present invention is configured as follows, the oil level and the tren carp can be detected or measured by changes in the capacitance between the inner and outer electrodes 21, 22, 31, and 32. According to the present invention, not only the signal line 25 connected to the oil level measuring electrode but also the trust line 38 connected to the drain amount detection electrode are connected to the outside of the tank so that they do not come into contact with the oil in the tank. Since it is connected to the oscillator 3, oil will not penetrate between the vinyl and the metal wire, and the measured capacitance will not change at the signal wire portion. Therefore, the capacitance value can be accurately measured, and the oil level and water trowel can be accurately measured. Furthermore, since the signal line is led out of the tank in the air, it is not subject to deterioration due to oil, so it has the advantage of a longer service life.
更に油面測定用の外極と沈澱水量検出電極の外極とを一
体構造の、共用形とすると、構造が簡単で加工、組み立
てが容易となるものである。更には油流入防止を施した
管を金属性とすると、信号線は同軸ケーブルに代えて安
価に入手できるビニール線が使港できるためコスト低減
になる。Furthermore, if the outer electrode for measuring the oil level and the outer electrode for detecting the amount of precipitated water are of an integral structure and of a common type, the structure is simple and processing and assembly are easy. Furthermore, if the pipe is made of metal to prevent oil inflow, the signal line can be replaced with a coaxial cable and an inexpensively available vinyl line can be used at the port, resulting in cost reduction.
第４図および第５図は本発明の別の実施例を示すもので
、油面測定用内極２２′を円筒状とし、ドレン−検出電
極の内極３２に接続された信号線３８を筒状の油面測定
用内極２２′の中を通すよりに構成し内極２２′の上下
端をエポキシ樹脂等の絶縁活栓２３．２４で密封して油
が中に入らないようにしたものである。この実施例でも
その作用効果は前記実嶋例と同じである。4 and 5 show another embodiment of the present invention, in which the oil level measuring inner pole 22' is cylindrical, and the signal line 38 connected to the inner pole 32 of the drain-detecting electrode is cylindrical. The inner pole 22' for measuring the oil level is passed through the inner pole 22', and the upper and lower ends of the inner pole 22' are sealed with insulating stopcocks 23 and 24 made of epoxy resin or the like to prevent oil from entering. be. The operation and effect of this embodiment are the same as those of the above-mentioned Mitsushima example.
第１図は本発明を実施した静電容量式油面計が適用され
る給油所の一例を示す模式図、第２図は本発明の一実施
例を示す断面図、１第３図は第２図において矢視■−■
でみた断面図、第４図は他の実施例を示す第１図と同様
な断面図、第５図は第４図におけるｖ−４断面図である
。Fig. 1 is a schematic diagram showing an example of a gas service station to which a capacitive oil level gauge embodying the present invention is applied, Fig. 2 is a sectional view showing an embodiment of the present invention, and Fig. In Figure 2, arrow view ■-■
4 is a sectional view similar to FIG. 1 showing another embodiment, and FIG. 5 is a sectional view taken along line V-4 in FIG. 4.
Claims (1)
くに、内外２［ｉから成るドレン鯖検出電極を設けると
共に、゛ドレン鰻検出電極に連結された信号線をタンク
上部に導くための油流入防止を隠した管を設けたことを
特徴とする静電容量式液面計。A drain eel detection electrode consisting of two inner and outer electrodes is installed near the bottom of the tank (h) of the oil level measuring electrode consisting of two inner and outer electrodes, and a drain eel detection electrode consisting of two inner and outer electrodes is installed. A capacitive liquid level gauge characterized by a hidden pipe that prevents oil from entering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56139788A JPS5842926A (en) | 1981-09-07 | 1981-09-07 | Electrostatic capacity type oil level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56139788A JPS5842926A (en) | 1981-09-07 | 1981-09-07 | Electrostatic capacity type oil level gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5842926A true JPS5842926A (en) | 1983-03-12 |
Family
ID=15253436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56139788A Pending JPS5842926A (en) | 1981-09-07 | 1981-09-07 | Electrostatic capacity type oil level gauge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5842926A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6090625U (en) * | 1983-11-25 | 1985-06-21 | シャープ株式会社 | Oil amount and water contamination detection device in oil tank |
| JPS60166825A (en) * | 1984-02-09 | 1985-08-30 | Tokyo Tatsuno Co Ltd | Electrostatic capacity measuring rod for detection of fuel oil level |
| JPH01223316A (en) * | 1988-03-02 | 1989-09-06 | Nippon Denpa Kk | Electrostatic capacity type liquid level measuring apparatus |
| WO2010066813A1 (en) * | 2008-12-09 | 2010-06-17 | Sentinel Import Export (Ireland) Limited | Storage tank monitoring apparatus |
-
1981
- 1981-09-07 JP JP56139788A patent/JPS5842926A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6090625U (en) * | 1983-11-25 | 1985-06-21 | シャープ株式会社 | Oil amount and water contamination detection device in oil tank |
| JPH0233141Y2 (en) * | 1983-11-25 | 1990-09-06 | ||
| JPS60166825A (en) * | 1984-02-09 | 1985-08-30 | Tokyo Tatsuno Co Ltd | Electrostatic capacity measuring rod for detection of fuel oil level |
| JPH01223316A (en) * | 1988-03-02 | 1989-09-06 | Nippon Denpa Kk | Electrostatic capacity type liquid level measuring apparatus |
| JPH05649B2 (en) * | 1988-03-02 | 1993-01-06 | Nippon Denpa Kk | |
| WO2010066813A1 (en) * | 2008-12-09 | 2010-06-17 | Sentinel Import Export (Ireland) Limited | Storage tank monitoring apparatus |
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