JP5618187B2 - Liquid level measuring device with density measuring function - Google Patents

Liquid level measuring device with density measuring function Download PDF

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JP5618187B2
JP5618187B2 JP2010136880A JP2010136880A JP5618187B2 JP 5618187 B2 JP5618187 B2 JP 5618187B2 JP 2010136880 A JP2010136880 A JP 2010136880A JP 2010136880 A JP2010136880 A JP 2010136880A JP 5618187 B2 JP5618187 B2 JP 5618187B2
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岡庭弘幸
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    • 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
    • G01F23/30—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 floats
    • G01F23/56—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 floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements
    • G01F23/62—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 floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements using magnetically actuated indicating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity

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  • Level Indicators Using A Float (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
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Description

本発明は、給油設備の燃料貯蔵容器の燃料の密度を検出することができる液面測定装置に関する。   The present invention relates to a liquid level measuring device capable of detecting the density of fuel in a fuel storage container of a fueling facility.

給油設備の燃料貯蔵容器の燃料の密度を検出する装置は、例えば特許文献1に見られるように駆動体と、この駆動体に係止し、自身の弾性変位が駆動体の駆動力を示す尺度であるバネと、バネの弾性変位を取得するための磁歪位置計測システムとから構成されている。   An apparatus for detecting the density of fuel in a fuel storage container of a fueling facility is, for example, as shown in Patent Document 1, a driving body and a scale that is locked to the driving body and whose elastic displacement indicates the driving force of the driving body. And a magnetostrictive position measuring system for acquiring the elastic displacement of the spring.

ヨーロッパ特許第1881316号公報European Patent No. 1881316 特許第3307610号公報Japanese Patent No. 3307610

しかしながら、密度測定のためだけにマグネットを有するストッパを余分に必要となるため構造が複雑になるという問題がある。
本発明はこのよう問題に鑑みてなされたものであってその目的とするところは、既存の構成部材を密度フロートの変位検出に利用して構造の簡素化を図ることができる液面計測装置を提供することである。 However, there is a problem that the structure becomes complicated because an extra stopper having a magnet is necessary only for density measurement.
The present invention has been made in view of such problems, and an object of the present invention is to provide a liquid level measuring device capable of simplifying the structure by utilizing the existing constituent members for detecting the displacement of the density float. Is to provide.

請求項1の発明は、油液の密度に追従する密度フロートと、液位に追従する油面検出用フロートとを前記密度フロートが下方となるように、磁歪線、及び検出用コイルを軸方向に延長して内蔵させたステムに摺動自在に配設し、少なくとも液位測定領域に磁歪線を配置し、一端から他端に向けて電気信号を発信し、前記密度フロートのマグネットと油面検出用フロートのマグネットとの反応により生じる磁歪波の到達時間の差を計測する制御装置を備えた密度測定機能を有する液面計測装置において、前記密度フロートは、その外径が油面検出用フロートの外径よりも大で、かつ前記油面検出用フロートの下部に接触しないフロート部と、前記油面検出用フロートよりも上部に延びる腕部と、前記腕部に連結して水平方向に伸びるマグネット保持部とから構成されている。 The axis of the invention of claim 1, and density float to follow the density of the hydraulic fluid, so that the float oil level detecting that follows the liquid level the density float becomes lower, the magnetostrictive wire, and the detecting coil slidably disposed in the stem which has a built-in extension direction, a magnetostrictive wire is disposed on at least a liquid level measurement area, it transmits an electrical signal from one end to the other end, the magnet and the oil of the density float in the liquid level measuring device with a density measurement function having a control device which measures the difference in arrival time of the magnetostrictive wave generated by reaction of a magnet surface detection float, the density float, for an outer diameter oil level detection A float part larger than the outer diameter of the float and not in contact with the lower part of the oil level detection float, an arm part extending above the oil level detection float, and connected to the arm part in the horizontal direction Magnet maintenance It consists of a holding part.

請求項2の発明は、前記密度フロートは、フロート部と前記よりも上方に延びる腕部とマグネット保持部とから構成されている。   According to a second aspect of the present invention, the density float is composed of a float part, an arm part extending above the magnet part, and a magnet holding part.

請求項1の発明によれば、既存の磁歪線式液面計の構造を利用して簡単な構造の密度測定機能を有する液面計測装置を提供できる。   According to the invention of claim 1, it is possible to provide a liquid level measuring device having a density measuring function with a simple structure using the structure of an existing magnetostrictive liquid level gauge.

本発明の一実施例を示すものである。1 shows one embodiment of the present invention. 密度フロート領域を拡大して示すものであって、図（ａ）（ｂ）（ｃ）は、それぞれ上面図、正面図、及び断面図である。The density float region is shown enlarged, and FIGS. (A), (b), and (c) are a top view, a front view, and a cross-sectional view, respectively. 図（ａ）（ｂ）は、それぞれ密度フロートの他の実施例を示すものである。Figures (a) and (b) show other examples of density floats, respectively.

図１は本発明の一実施例を示すものであって、地下タンク１には地上に設けられたピットとの間にライザパイプ３が接続されていて、本発明が特徴とする液面検出装置４がタンク１に設置されている。   FIG. 1 shows an embodiment of the present invention, in which a riser pipe 3 is connected to an underground tank 1 and a pit provided on the ground, and the liquid level detecting device characterized by the present invention 4 is installed in the tank 1.

液面検出装置４は、駆動手段を収容したヘッド部２と、磁歪線や検出コイルの収容体を兼ねる管により構成されたステム５と、貯油領域に位置しステム５に摺動可能に挿入された油面検出用フロート６で構成されている。ステム５は、収容している磁歪線の張力や、外力に抗することができる程度の剛性を備えた非磁性体金属、この実施例では不錆鋼のパイプにより構成されている。なお、符号１１はデータ処理部を示す。   The liquid level detection device 4 is slidably inserted into the stem 5 located in the oil storage region, the head portion 2 containing the driving means, the stem 5 constituted by a tube that also serves as a housing for the magnetostrictive wire and the detection coil. The oil level detection float 6 is used. The stem 5 is constituted by a nonmagnetic metal having rigidity sufficient to resist the tension of the magnetostrictive wire accommodated and external force, and in this embodiment, a pipe made of non-rust steel. Reference numeral 11 denotes a data processing unit.

本発明が特徴とする密度フロート７は、油面検出用フロート６の下方に位置し、かつ油面検出用フロート６とは独立して摺動できるようにステム５に配置されている。    The density float 7 characterized by the present invention is located on the stem 5 so as to be positioned below the oil level detection float 6 and to be able to slide independently of the oil level detection float 6.

密度フロート７は、その外径Ｄ1が油面検出用フロート６の外径Ｄ2よりも大で、かつ本体部の上面７ａが油面検出用フロート６の下部６ａに接触しないフロート部７ｂと、油面検出用フロート６のマグネット６ｂよりも上部に延びる腕部７ｃと、この腕部７ｃに連結し水平方向に伸びるマグネット保持部７ｄと、このマグネット保持部７ｄに固定されたマグネット７ｅとから構成されている。腕部７ｃは、油面検出用フロート６との干渉を避けるため、油面検出用フロート６の外周面との間に間隙を確保できる程度の距離をあけて配置されている。腕部７ｃには上下に延びるスリット７ｆが形成されている。   The density float 7 has a float portion 7b whose outer diameter D1 is larger than the outer diameter D2 of the oil level detection float 6 and whose upper surface 7a of the main body portion does not contact the lower portion 6a of the oil level detection float 6; The arm portion 7c extends above the magnet 6b of the surface detection float 6, a magnet holding portion 7d connected to the arm portion 7c and extending in the horizontal direction, and a magnet 7e fixed to the magnet holding portion 7d. ing. In order to avoid interference with the oil level detection float 6, the arm portion 7 c is disposed with a distance sufficient to ensure a gap with the outer peripheral surface of the oil level detection float 6. The arm portion 7c is formed with a slit 7f extending vertically.

この実施例において、油面検出用フロート６はタンクの油面Ｈに一致して移動し、密度フロート７は、油液の比重に対応して浮力の作用を受けて、ボーメ計と同様に沈降量が変化するからそれぞれのフロート６，７のマグネット６ｂとマグネット７ｅとの相対距離Ｌが油液の密度に対応して変化する。   In this embodiment, the oil level detecting float 6 moves in accordance with the oil level H of the tank, and the density float 7 is subjected to buoyancy in response to the specific gravity of the oil liquid, and settles in the same manner as the Baume meter. Since the amount changes, the relative distance L between the magnets 6b and 7e of the respective floats 6 and 7 changes corresponding to the density of the oil liquid.

基準点からマグネット６ｂ、及びマグネット７ｅまでの距離は、特許文献2に記載されている磁歪線式液面計と同様の手法で検出することができる。
つまり測定周期に基づいて送信コイルに磁界が発生して磁歪線に瞬間的に機械的歪みが発生すると、超音波振動となって磁歪線を他端に向けて伝搬する。 The distance from the reference point to the magnet 6b and the magnet 7e can be detected by the same method as the magnetostrictive liquid level gauge described in Patent Document 2.
That is, when a magnetic field is generated in the transmission coil based on the measurement period and mechanical strain is instantaneously generated in the magnetostrictive line, it becomes ultrasonic vibration and propagates toward the other end.

超音波振動がそれぞれのフロート６、７のマグネット６ｂ、７ｅに到達すると、フロート６、７のマグネット６ｂ、７ｅよる磁界を受けて逆磁歪効果により検出コイルに起電力を発生させる。この起電力はヘッド部２に伝送されてそれぞれのマグネット６ｂ、７ｅの距離、つまり油液の密度に相関する時間差として検出される。言うまでもなくマグネット６ｂによる起電力の信号は液位に関するデータとして利用される。 When the ultrasonic vibration reaches the magnets 6b and 7e of the respective floats 6 and 7, an electromotive force is generated in the detection coil due to the inverse magnetostriction effect by receiving a magnetic field by the magnets 6b and 7e of the floats 6 and 7. This electromotive force is transmitted to the head unit 2 and detected as a time difference correlated to the distance between the magnets 6b and 7e, that is, the density of the oil liquid. Needless to say, the electromotive force signal from the magnet 6b is used as data relating to the liquid level .

図3（ａ）（ｂ）は、それぞれ密度フロートの他の実施例を示すものであって、マグネット保持部７ｄ’、７ｄ”が周辺側を下方とする斜面（図3（ａ））や球面（図3（ｂ））に形成して構成されている。   FIGS. 3 (a) and 3 (b) show other embodiments of the density float, respectively, in which the magnet holding portions 7d ′ and 7d ″ are inclined surfaces (FIG. 3 (a)) and spherical surfaces with the peripheral side down. (FIG. 3B) is formed.

この実施例によれば、結露などにより上面に水滴が付着しても斜面や球面を滑って容易に落下するから、密度フロート７は水滴の影響を受けることなく密度だけに関係して沈降するから密度を正確に測定することができる。さらには油液の温度を検出することによりデータを温度補正してより高精度の測定が可能となる。
さらには、検出した密度データに基づいて油面検出用フロート６の位置を補正することにより高い精度で液位を検出することができる。 According to this embodiment, even if water droplets adhere to the upper surface due to condensation or the like, it slides down on the slope or spherical surface and falls easily, so does the density float 7 settle only in relation to the density without being affected by the water droplets? The density can be measured accurately. Furthermore, by detecting the temperature of the oil liquid, the data can be temperature-corrected and more accurate measurement can be performed.
Furthermore, it is possible to detect the liquid level in due Ri have high accuracy to correct the position of the oil level detecting float 6 based on the detected density data.

なお、上述の実施例においては位置検出用のマグネットをそれぞれのフロートの上部に配置しているが、相互間の距離測定に干渉が生じない位置であれば同様の作用を奏することは明らかである。   In the above-described embodiment, the position detecting magnet is disposed above each float. However, it is obvious that the same effect can be obtained as long as no interference occurs in the distance measurement between them. .

このようにして測定された密度は、たとえばエタノール混合燃料の場合には、水が不正に混合されているか否かの判定に利用できる。また、燃料の油種ごとに密度が相違するから、異油種のコンタミの有無の監視に利用できる。   The density measured in this way can be used to determine whether or not water is improperly mixed, for example, in the case of ethanol mixed fuel. Moreover, since the density differs depending on the type of fuel, it can be used for monitoring the presence or absence of contamination of different types of oil.

Claims (2)

油液の密度に追従する密度フロートと、液位に追従する油面検出用フロートとを前記密度フロートが下方となるように、磁歪線、及び検出用コイルを軸方向に延長して内蔵させたステムに摺動自在に配設し、少なくとも液位測定領域に磁歪線を配置し、一端から他端に向けて電気信号を発信し、前記密度フロートのマグネットと油面検出用フロートのマグネットとの反応により生じる磁歪波の到達時間の差を計測する制御装置を備えた密度測定機能を有する液面計測装置において、
前記密度フロートは、その外径が油面検出用フロートの外径よりも大で、かつ前記油面検出用フロートの下部に接触しないフロート部と、前記油面検出用フロートよりも上部に延びる腕部と、前記腕部に連結して水平方向に伸びるマグネット保持部とから構成されている液面計測装置。 And density float to follow the density of the hydraulic fluid, as the oil level detecting float and the density float to follow the liquid level becomes lower, the magnetostrictive wire, and is incorporated by axially extending detection coil stem slidably disposed in the magnetostrictive wire is disposed on at least a liquid level measurement area, transmits an electrical signal from one end to the other end, the magnet of the magnet and the oil level detecting float of the density float In a liquid level measuring device having a density measuring function equipped with a control device for measuring the difference in arrival time of magnetostrictive waves generated by the reaction of
The density float has an outer diameter larger than the outer diameter of the oil level detection float and does not contact the lower part of the oil level detection float, and an arm extending upward from the oil level detection float A liquid level measuring device comprising a part and a magnet holding part connected to the arm part and extending in the horizontal direction . 前記密度フロートのマグネット保持部が、周面側が下方となるように斜面、または湾曲面として構成されている請求項１に記載の密度測定機能を有する液面計測装置。 The liquid level measuring device having a density measuring function according to claim 1 , wherein the magnet holder of the density float is configured as an inclined surface or a curved surface so that a peripheral surface side is downward.
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