JP2000146671A - Immersion liq. level transmitter - Google Patents
Immersion liq. level transmitterInfo
- Publication number
- JP2000146671A JP2000146671A JP10314902A JP31490298A JP2000146671A JP 2000146671 A JP2000146671 A JP 2000146671A JP 10314902 A JP10314902 A JP 10314902A JP 31490298 A JP31490298 A JP 31490298A JP 2000146671 A JP2000146671 A JP 2000146671A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- liquid level
- detector
- pressure receiving
- diaphragm
- 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
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、液中へ沈めて液
位を測定する投込式液位伝送器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a immersion type liquid level transmitter for immersing in a liquid and measuring the liquid level.
【０００２】[0002]
【従来の技術】従来、液中に沈めて液位を測定する投込
式液位伝送器の検出器は、例えば、図１０に示す如く、
受圧ダイアフラム１０１と、受圧ダイアフラム１０１内
に封入された封入液１０３と、封入液１０３を介して伝
達される圧力変化を検知する圧力センサ１０５と、圧力
センサ１０５からの信号を電気信号に変換して地上へ送
る信号増幅変換部１０７とを備え、受圧ダイアフラム１
０１は測定液面に対し、水平方向に配置された構造とな
っている。2. Description of the Related Art Conventionally, a detector of an immersion type liquid level transmitter for measuring a liquid level submerged in a liquid, for example, as shown in FIG.
The pressure receiving diaphragm 101, a filling liquid 103 sealed in the pressure receiving diaphragm 101, a pressure sensor 105 for detecting a change in pressure transmitted through the filling liquid 103, and converting a signal from the pressure sensor 105 into an electric signal A signal amplifying / converting unit 107 for sending to the ground;
Reference numeral 01 denotes a structure arranged in the horizontal direction with respect to the measurement liquid level.
【０００３】[0003]
【発明が解決しようとする課題】受圧ダイアフラム１０
１は、測定液面に対して水平方向に配置されているた
め、液中に投げ入れた時に、底と接触して損傷が起きる
ことがないよう保護部１０９によって保護されている。SUMMARY OF THE INVENTION A pressure receiving diaphragm 10 is provided.
1 is disposed in a horizontal direction with respect to the measurement liquid level, and thus is protected by the protection unit 109 so as not to be in contact with the bottom and to be damaged when thrown into the liquid.
【０００４】このために、検出器１１１が液中に沈む時
に、水平に配置された形状と相俟って、空気が抜けきれ
ずに受圧ダイアフラム１０１の作用面に空気溜りが作ら
れる結果、空気溜りが邪魔をして正確な液位測定ができ
ない問題があった。[0004] For this reason, when the detector 111 sinks in the liquid, in combination with the horizontally arranged shape, the air cannot be completely removed, and an air pocket is formed on the working surface of the pressure receiving diaphragm 101. There was a problem that accurate measurement of the liquid level could not be performed because the reservoir was in the way.
【０００５】また、受圧ダイアフラム１０１を保護する
保護部１０９は、測定液面の底に接することで保護機能
を有するようになるが、受圧ダイアフラム１０１は保護
部１０９によって底Ｇから所定高さの液圧を測定するこ
ととなり、これもまた測定誤差を招く要因となってい
た。The protection section 109 for protecting the pressure receiving diaphragm 101 comes into contact with the bottom of the measuring liquid level to have a protection function. The pressure receiving diaphragm 101 has a predetermined height from the bottom G by the protection section 109. The pressure was measured, which also caused a measurement error.
【０００６】そこで、この発明は、正確な液位測定を可
能とした投込式液位伝送路を提供することを目的として
いる。Accordingly, an object of the present invention is to provide a immersion type liquid level transmission line which enables accurate liquid level measurement.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するため
に、この発明の請求項１にあっては、先端に設けられた
受圧ダイアフラムと、その受圧ダイアフラムを介して測
定媒体のヘッド圧を検出し液位を測定する検出器とを備
えた投込式液位伝送器において、前記受圧ダイアフラム
を測定液面に対して垂直方向に配置する。In order to achieve the above object, according to the first aspect of the present invention, a pressure-receiving diaphragm provided at a leading end and a head pressure of a measurement medium are detected via the pressure-receiving diaphragm. In a immersion type liquid level transmitter provided with a detector for measuring a liquid level, the pressure receiving diaphragm is arranged in a direction perpendicular to a liquid level to be measured.
【０００８】これにより、検出器が測定液面に沈む時
に、空気は受圧ダイアフラムに沿って上方へ抜けていく
ため空気溜りは作られることがなくなり、正確な液位測
定を行なうことができる。また、受圧ダイアフラムは、
保護部がなくても、底と直接接合し合うことがなくなる
と共に、保護部がない分、測定位置を底に近づけること
が可能となり、測定誤差を小さく抑えられる。Accordingly, when the detector sinks to the surface of the liquid to be measured, the air flows upward along the pressure receiving diaphragm, so that no air pocket is formed, and accurate liquid level measurement can be performed. In addition, the pressure receiving diaphragm
Even if there is no protection part, it will not be directly bonded to the bottom, and since there is no protection part, it is possible to bring the measurement position closer to the bottom, and the measurement error can be kept small.
【０００９】また、この発明の請求項２によれば、受圧
ダイアフラムを、二つ以上配置する。According to a second aspect of the present invention, two or more pressure receiving diaphragms are arranged.
【００１０】これにより、請求項１の効果に加えて、受
圧ダイアフラムのダイアフラム面の径を規定された条件
より小さくしても、正確な液圧測定が可能となり、受圧
ダイアフラムの小径化が図れる。Accordingly, in addition to the effect of the first aspect, even if the diameter of the diaphragm surface of the pressure receiving diaphragm is smaller than the prescribed condition, accurate liquid pressure measurement can be performed, and the diameter of the pressure receiving diaphragm can be reduced.
【００１１】また、この発明の請求項３によれば、検出
器に、受圧ダイアフラムの周囲を取り囲む保護カバーを
着脱自在に取り付ける。According to a third aspect of the present invention, a protective cover surrounding the periphery of the pressure receiving diaphragm is detachably attached to the detector.
【００１２】これにより、請求項１の効果に加えて、取
扱い搬送時等において、保護カバーによって受圧ダイア
フラム損傷を受けることがなくなる。Thus, in addition to the effect of the first aspect, the pressure receiving diaphragm is not damaged by the protective cover during handling and transportation.
【００１３】また、この発明の請求項４によれば、保護
カバーに、内部の空気を逃がす空気抜き孔を備えてい
る。According to a fourth aspect of the present invention, the protective cover is provided with an air vent for releasing the air inside.
【００１４】これにより、受圧ダイアフラムの保護が図
れると共に、液中へ沈めた時に、空気は空気抜き孔から
外へ逃げるため、正確な液位測定が行なえる。Thus, the pressure receiving diaphragm can be protected, and when it is submerged in the liquid, the air escapes from the air vent hole, so that accurate liquid level measurement can be performed.
【００１５】また、この発明の請求項５によれば、保護
カバーを、金網で形成する。According to the fifth aspect of the present invention, the protective cover is formed by a wire net.
【００１６】これにより、受圧ダイアフラムの保護を図
ることができると共に、液中へ沈めた時に、空気は金網
の網目から外へ逃げるため、正確な液位測定が行なえ
る。Thus, the pressure receiving diaphragm can be protected, and when it is submerged in the liquid, the air escapes from the mesh of the wire mesh, so that accurate liquid level measurement can be performed.
【００１７】また、この発明の請求項６によれば、保護
カバーを、保護カバー自体が導圧、又は空気を通す材料
で作る。According to the sixth aspect of the present invention, the protective cover is made of a material that allows the protective cover itself to conduct pressure or allow air to pass therethrough.
【００１８】これにより、受圧ダイアフラムの保護を図
ることができると共に、液中へ沈めた時に、空気は保護
カバーを通過し、外へ逃げるようになり、正確な液位測
定が行なえる。Thus, the pressure receiving diaphragm can be protected, and when submerged in the liquid, the air passes through the protective cover and escapes to the outside, so that accurate liquid level measurement can be performed.
【００１９】[0019]
【発明の実施の形態】以下、図１乃至図３の図面を参照
しながらこの発明の第１実施形態について具体的に説明
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.
【００２０】図３は投込式液位伝送器１を示している。
投込式液位伝送器１は、液中へ沈める検出器３と、検出
器３からの信号を地上へ送る中空ケーブル５と中空ケー
ブル５からの信号を中継する地上に設置された中継ハウ
ジング７とから成っている。FIG. 3 shows the injection type liquid level transmitter 1.
The immersion type liquid level transmitter 1 includes a detector 3 submerged in liquid, a hollow cable 5 for transmitting a signal from the detector 3 to the ground, and a relay housing 7 installed on the ground for relaying a signal from the hollow cable 5. And consists of
【００２１】検出器３は、図１に示す如く、ハウジング
９内に圧力センサ１１と信号増幅変換部１３が配置さ
れ、ハウジング９の先端は圧力検知部１５となってい
る。圧力検知部１５は、受圧ダイアフラム１７と、測定
媒体となる封入液１９とで構成され、受圧ダイアフラム
１７は、圧力検知部１５の先端の厚みを残して測定液面
に対して垂直方向（図面上下方向）に配置されている。
受圧ダイアフラム１７のダイアフラム面１７ａは側方、
図面左右方向に向いた形状となっている。As shown in FIG. 1, the detector 3 has a pressure sensor 11 and a signal amplification / conversion unit 13 disposed inside a housing 9, and a tip of the housing 9 serves as a pressure detection unit 15. The pressure detecting section 15 is composed of a pressure receiving diaphragm 17 and a sealed liquid 19 serving as a measurement medium. The pressure receiving diaphragm 17 is perpendicular to the liquid surface to be measured (up and down in FIG. Direction).
The diaphragm surface 17a of the pressure receiving diaphragm 17 is lateral,
The shape is oriented in the horizontal direction of the drawing.
【００２２】封入液１９は受圧ダイアフラム１７の内側
に充填封入され、受圧ダイアフラム１７を介して入力さ
れる圧力を、前記圧力センサ１１に伝達するよう機能す
る。圧力センサ１１で検知された圧力値は、信号増幅変
換部１３において電気信号に変換され、中空ケーブル５
を介して地上の中継ハウジング７へ送られるようになっ
ている。The sealed liquid 19 is filled and sealed inside the pressure receiving diaphragm 17, and functions to transmit the pressure input through the pressure receiving diaphragm 17 to the pressure sensor 11. The pressure value detected by the pressure sensor 11 is converted into an electric signal by the signal
To the relay housing 7 on the ground.
【００２３】なお、中継ハウジング７は公知のものを使
用し、ここでは要旨外のため詳細な説明を省略する。The relay housing 7 is of a known type, and the detailed description is omitted here because it is out of scope.
【００２４】このように構成された投込式液位伝送器１
によれば、検出器３を液中に沈める時に、例えば、図３
に示す如く、リング状の重錘スタンド２１を使用する。
この時、空気は受圧ダイアフラム１７の垂直なダイアフ
ラム面１７ａに沿って上方へ抜けていくため、空気溜り
は起こらず、正確な液位測定が行なえる。Immersion type liquid level transmitter 1 constructed as described above
According to FIG. 3, when the detector 3 is submerged in the liquid, for example, as shown in FIG.
As shown in the figure, a ring-shaped weight stand 21 is used.
At this time, since the air flows upward along the vertical diaphragm surface 17a of the pressure receiving diaphragm 17, no air pool occurs and accurate liquid level measurement can be performed.
【００２５】また、検出器１５が沈んで、先端の圧力検
出部１５が底Ｇと接触しても、垂直方向の受圧ダイアフ
ラム１７は直接損傷等を受けることはない。しかも、保
護部がない分、測定位置を底Ｇに近づけることが可能と
なり、測定誤差を小さく抑えることができる。Further, even if the detector 15 sinks and the pressure detecting portion 15 at the tip contacts the bottom G, the pressure receiving diaphragm 17 in the vertical direction is not directly damaged. In addition, the measurement position can be brought closer to the bottom G because of the absence of the protection portion, and the measurement error can be reduced.
【００２６】図４、図５は圧力検知部１５の第２の実施
形態を示したものである。FIGS. 4 and 5 show a second embodiment of the pressure detecting section 15. FIG.
【００２７】即ち、圧力検知部１５を、先端が円弧状と
なった所定の厚みを有する板状に形成し、垂直面となる
両側面１５ａに受圧ダイアフラム１７を二つ配置し、そ
の受圧ダイアフラム１７と受圧ダイアフラム１７との間
に封入液１９を充填封入した構造とするものである。That is, the pressure detecting portion 15 is formed in a plate shape having a predetermined thickness with an arc-shaped tip, and two pressure receiving diaphragms 17 are arranged on both side surfaces 15a which are vertical surfaces. And a pressure receiving diaphragm 17 filled with a filling liquid 19.
【００２８】なお、他の構成要素は、第１の実施形態と
同一のため同一符号を符して詳細な説明を省略する。The other components are the same as those in the first embodiment, and therefore, are denoted by the same reference numerals and will not be described in detail.
【００２９】したがって、この第２の実施形態によれ
ば、第１の実施形態の効果に加えて、液位測定を二つの
受圧ダイアフラム１７で測定するため、規定された大き
さのダイアフラム面１７ａより寸法ａが小さくても正確
な圧力検知が行なえる。このため、圧力検知部１５の寸
法を小さくすることが可能となり、検知器全体の小型化
が図れる。Therefore, according to the second embodiment, in addition to the effect of the first embodiment, the liquid level is measured by the two pressure receiving diaphragms 17, so that the diaphragm surface 17a having a prescribed size is used. Even if the dimension a is small, accurate pressure detection can be performed. For this reason, it is possible to reduce the size of the pressure detecting unit 15, and to downsize the entire detector.
【００３０】なお、受圧ダイアフラム１７は、図６に示
す如く、圧力検知部１５を４つの垂直面を有する角筒状
に形成し、その前後左右の４面又は３面に受圧ダイアフ
ラム１７を設けるようにしても、第２の実施形態と同様
の効果が期待できる。As shown in FIG. 6, the pressure receiving diaphragm 17 is formed such that the pressure detecting portion 15 is formed in a rectangular cylindrical shape having four vertical surfaces, and the pressure receiving diaphragm 17 is provided on four or three front, rear, left and right surfaces. Even so, the same effect as in the second embodiment can be expected.
【００３１】図７は圧力検知部１５に保護カバー２５を
設けた第３の実施形態を示したものである。FIG. 7 shows a third embodiment in which a protective cover 25 is provided on the pressure detecting section 15.
【００３２】即ち、検出器９の先端のねじ部２７に、圧
力検知部１５を取り囲む保護カバー２５を螺合させた着
脱自在の構造とするものである。That is, the detector 9 has a detachable structure in which a protective cover 25 surrounding the pressure detecting portion 15 is screwed to the screw portion 27 at the tip of the detector 9.
【００３３】保護カバー２５には、複数の空気抜き孔２
９が設けられ、液中へ沈めた時に内部の空気がスムーズ
に外へ抜けるようになっている。The protective cover 25 has a plurality of air vent holes 2.
9 is provided to allow the air inside to smoothly flow out when submerged in the liquid.
【００３４】なお、他の構成要素は第１の実施形態と同
一のため、同一符号を符して詳細な説明を省略する。Since the other components are the same as those of the first embodiment, the same reference numerals are used and the detailed description is omitted.
【００３５】したがって、この第３の実施形態によれ
ば、第１の実施形態の効果に加えて、取扱い搬送時等に
おいて、受圧ダイアフラム１７が衝突等により損傷を受
けることがなくなる。また、保護カバー２５を取外すこ
とで、メンテナンス性の向上が図れる。Therefore, according to the third embodiment, in addition to the effect of the first embodiment, the pressure receiving diaphragm 17 is not damaged by collision or the like during handling and transportation. Further, by removing the protective cover 25, maintenance can be improved.
【００３６】一方、検出器９を液中に沈める時に、空気
は、空気抜き孔２９から外へ抜けるため空気溜りが作ら
れることがなくなり、正確な液位測定が行なえる。On the other hand, when the detector 9 is immersed in the liquid, the air flows out of the air vent hole 29 so that no air pocket is formed, and accurate liquid level measurement can be performed.
【００３７】なお、保護カバー２５は、図８に示す如
く、金網製の保護カバー２５としてもよい。あるいは、
図９に示す如く、空気が円滑に抜ける焼結金属製の保護
カバー２５としても、同様の作用、効果が期待できる。As shown in FIG. 8, the protection cover 25 may be a wire net protection cover 25. Or,
As shown in FIG. 9, the same operation and effect can be expected even with a protective cover 25 made of a sintered metal through which air can smoothly escape.
【００３８】[0038]
【発明の効果】以上、説明したように、この発明の投込
式液位伝送器によれば、検出器を液中に沈めた時に、空
気は、垂直方向の受圧ダイアフラムに沿って逃げるよう
になるため、空気溜りが作られるこがなく、正確な液位
測定を行なうことができる。また、測定位置を底に近づ
けることができるため、測定誤差を小さく抑えられる。As described above, according to the immersion type liquid level transmitter of the present invention, when the detector is submerged in the liquid, the air escapes along the vertical pressure receiving diaphragm. Therefore, an air reservoir is not formed and accurate liquid level measurement can be performed. Further, since the measurement position can be made closer to the bottom, the measurement error can be reduced.
【図１】この発明にかかる投込式液位伝送器の検出器を
示した概要断面図。FIG. 1 is a schematic cross-sectional view showing a detector of an injection type liquid level transmitter according to the present invention.
【図２】検出器の概要斜視図。FIG. 2 is a schematic perspective view of a detector.
【図３】投込式液位伝送器の使用状態を示した全体の説
明図。FIG. 3 is an overall explanatory diagram showing a use state of the injection type liquid level transmitter.
【図４】受圧ダイアフラムを二つ設けた図１と同様の概
要断面図。FIG. 4 is a schematic sectional view similar to FIG. 1, in which two pressure receiving diaphragms are provided.
【図５】図４の検出器の概要斜視図。FIG. 5 is a schematic perspective view of the detector of FIG.
【図６】受圧ダイアフラムを二つ以上設けた検出器の斜
視図。FIG. 6 is a perspective view of a detector provided with two or more pressure receiving diaphragms.
【図７】受圧ダイアフラムを保護する保護カバーを設け
た検出器の概要説明図。FIG. 7 is a schematic explanatory view of a detector provided with a protective cover for protecting the pressure receiving diaphragm.
【図８】保護カバーを金網製とした図７と同様の概要説
明図。FIG. 8 is a schematic explanatory view similar to FIG. 7, in which a protective cover is made of a wire mesh;
【図９】保護カバーを焼結金属製とした図７と同様の概
要説明図。FIG. 9 is a schematic explanatory view similar to FIG. 7, in which a protective cover is made of sintered metal.
【図１０】従来例を示した検出器の説明図。FIG. 10 is an explanatory diagram of a detector showing a conventional example.
【符号の説明】 ９ 検出器 １７ 受圧ダイアフラム １９ 封入液（測定媒体）[Description of Signs] 9 Detector 17 Pressure receiving diaphragm 19 Filled liquid (measurement medium)
Claims (6)
その受圧ダイアフラムを介して測定媒体のヘッド圧を検
出し液位を測定する検出器とを備えた投込式液位伝送器
において、前記受圧ダイアフラムを測定液面に対して垂
直方向に配置することを特徴とする投込式液位伝送器。1. A pressure receiving diaphragm provided at a tip end,
In a immersion type liquid level transmitter having a detector for detecting the head pressure of the measurement medium via the pressure receiving diaphragm and measuring the liquid level, the pressure receiving diaphragm is disposed in a direction perpendicular to the measurement liquid level. Immersion type liquid level transmitter.
ることを特徴とする請求項１記載の投込式液位伝送器。2. The immersion type liquid level transmitter according to claim 1, wherein the pressure receiving diaphragm has two or more pressure receiving diaphragms.
り囲む保護カバーを着脱自在に取り付けたことを特徴と
する請求項１記載の投込式液位伝送器。3. The liquid level transmitter according to claim 1, wherein a protective cover surrounding the pressure receiving diaphragm is detachably attached to the detector.
抜き孔を備えていることを特徴とする請求項３記載の投
込式液位伝送器。4. The liquid level transmitter according to claim 3, wherein the protective cover has an air vent hole for releasing air inside.
とを特徴とする請求項３記載の投込式液位伝送器。5. The liquid level transmitter according to claim 3, wherein the protective cover is formed of a wire net.
および空気を通す材料でできていることを特徴とする請
求項３記載の投込式液位伝送器。6. The protective cover is configured such that the protective cover itself conducts pressure,
4. An injection-type liquid level transmitter according to claim 3, wherein said transmitter is made of a material through which air flows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10314902A JP2000146671A (en) | 1998-11-05 | 1998-11-05 | Immersion liq. level transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10314902A JP2000146671A (en) | 1998-11-05 | 1998-11-05 | Immersion liq. level transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000146671A true JP2000146671A (en) | 2000-05-26 |
Family
ID=18059023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10314902A Pending JP2000146671A (en) | 1998-11-05 | 1998-11-05 | Immersion liq. level transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000146671A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016128756A (en) * | 2015-01-09 | 2016-07-14 | 中国電力株式会社 | Protection tool of throw-in type water gauge |
| CN113108863A (en) * | 2020-01-10 | 2021-07-13 | 横河电机株式会社 | Liquid level indicator with protective cover |
-
1998
- 1998-11-05 JP JP10314902A patent/JP2000146671A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016128756A (en) * | 2015-01-09 | 2016-07-14 | 中国電力株式会社 | Protection tool of throw-in type water gauge |
| CN113108863A (en) * | 2020-01-10 | 2021-07-13 | 横河电机株式会社 | Liquid level indicator with protective cover |
| CN113108863B (en) * | 2020-01-10 | 2024-06-07 | 横河电机株式会社 | Liquid level indicator with protective cover |
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