JPH08292080A - Differential pressure type water level measuring device - Google Patents

Differential pressure type water level measuring device

Info

Publication number
JPH08292080A
JPH08292080A JP9652195A JP9652195A JPH08292080A JP H08292080 A JPH08292080 A JP H08292080A JP 9652195 A JP9652195 A JP 9652195A JP 9652195 A JP9652195 A JP 9652195A JP H08292080 A JPH08292080 A JP H08292080A
Authority
JP
Japan
Prior art keywords
water
water level
level
head
differential pressure
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
Application number
JP9652195A
Other languages
Japanese (ja)
Inventor
Kunio Ishii
邦男 石井
Masanori Oshima
正徳 大嶋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Engineering Co Ltd
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Engineering Co Ltd
Priority to JP9652195A priority Critical patent/JPH08292080A/en
Publication of JPH08292080A publication Critical patent/JPH08292080A/en
Pending legal-status Critical Current

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  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

PURPOSE: To make accurate stage measurement and water level control achievable even in those of tanks whose pressure in unstable. CONSTITUTION: A level switch 4 is set up in a pipe 6 which performs the same level change as a reference surface apparatus 2, detecting a variation in a reference water head, and a make-up valve 5 is opened or closed by means of on-off control, supplying water, whereby the reference water head is always held aright and thus an accurate water level is securable.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、差圧式水位測定装置に
係り、特に、圧力が不安定なタンク類の水位を測定する
差圧式水位測定装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential pressure type water level measuring device, and more particularly to a differential pressure type water level measuring device for measuring the water level of tanks with unstable pressure.

【0002】[0002]

【従来の技術】従来の装置は、図3に示すように低圧側
導圧配管8に基準面器2を設置し、基準水頭を確保し、
タンク1内の水位変化を高圧側導圧配管9にて圧力変化
として検出し、その差圧を水位として計測する。
2. Description of the Related Art In a conventional device, as shown in FIG. 3, a reference surface 2 is installed on a low pressure side pressure guiding pipe 8 to secure a reference head.
A water level change in the tank 1 is detected as a pressure change in the high pressure side pressure guiding pipe 9, and the differential pressure is measured as a water level.

【0003】低圧側導圧配管8の基準面器2から水位計
3までのrh2と高圧側導圧配管9の基準面(0%レベ
ル)までのrh1の水頭の差圧をゼロ点補正し、タンク
1の水位Hの変化を高圧側の水頭圧として検出し、水位
を計測する。従って、基準水頭が低下すればゼロ点補正
がずれ、水位計測の誤差となる。
The differential pressure of the water head of rh2 from the reference level device 2 of the low pressure side pressure guiding pipe 8 to the water level gauge 3 and rh1 from the reference level of the high pressure side pressure guiding pipe 9 (0% level) is corrected to a zero point, The change in the water level H of the tank 1 is detected as the head pressure on the high pressure side, and the water level is measured. Therefore, if the reference water head is lowered, the zero point correction is deviated, resulting in an error in water level measurement.

【0004】この誤差要因を改善する方法として、例え
ば特開昭56−42111 号公報のように低圧側導圧配管に設
置された基準面器と基準面器の上流側(タンク側)検出
配管の接合部にオリフィスを設置することにより、基準
面器内の水の流出量を制限し、基準水頭の変化を少なく
していた。
As a method of improving this error factor, for example, as disclosed in JP-A-56-42111, a reference level gauge installed on the low pressure side pressure guiding tube and a detection pipeline on the upstream side (tank side) of the reference level gauge are installed. By installing an orifice at the joint, the outflow rate of water in the reference surface was restricted and the change in the reference head was reduced.

【0005】また、従来では、特開昭59−176626号公報
のように低圧側及び高圧側導圧配管にそれぞれタンク検
出座近傍と水位計の近くに計4台の圧力計を設置し、更
に演算器を2台設置し圧力計の信号を演算器に入力し、
水位計の指示を補正していた。
Further, conventionally, a total of four pressure gauges are installed near the tank detection seat and near the water level gauge in the low-pressure side and high-pressure side pressure guiding pipes, respectively, as in JP-A-59-176626. Install two calculators, input the pressure gauge signal to the calculator,
The instructions of the water level gauge were corrected.

【0006】[0006]

【発明が解決しようとする課題】従来技術では、タンク
内の圧力がプラント負荷変更に伴い負圧となった場合、
基準面器内の水がフラッシュ又はタンク側に吸い込まれ
ることにより基準水頭が低下し、低圧及び高圧側のゼロ
点補正がずれ、水位計測の誤差となる。
In the prior art, when the pressure in the tank becomes a negative pressure due to the change of the plant load,
The water in the reference surface device is flushed or sucked into the tank, which lowers the reference water head, and the zero point correction on the low and high pressure sides is deviated, resulting in an error in water level measurement.

【0007】上記の問題を改善する方法として、従来技
術は、基準面器内の水の流出量を制限し、基準水頭の低
下を減少する為にオリフィスを設置しているが、基準水
頭の低下を皆無にすることが出来ず、オリフィス部での
閉塞する可能性の点について考慮されておらず、閉塞に
よる圧力ハンチングまた誤った水位を計測する等の問題
があった。
As a method for improving the above-mentioned problem, in the prior art, the orifice is installed to limit the outflow of water in the reference surface device and reduce the decrease in the reference head. However, there was a problem such as pressure hunting due to blockage and erroneous water level measurement.

【0008】また後者は、高低圧導圧配管にそれぞれ計
4台の圧力計と2台の演算器を設置し、圧力の変動に対
し各点の圧力を検出し、水位測定値を補正する方式であ
るが水位測定の構成が大掛かりとなる。
In the latter method, a total of four pressure gauges and two arithmetic units are installed in each of the high and low pressure guiding pipes, and the pressure at each point is detected in response to pressure fluctuations, and the water level measurement value is corrected. However, the configuration of water level measurement becomes a large scale.

【0009】本発明の目的は、簡単な水位計測装置の構
成でかつ、計測上の不具合の要素を取り除きタンク内の
圧力変化に係わらず常に正確な水位を測定する差圧式水
位測定装置を提供することにある。
An object of the present invention is to provide a differential pressure type water level measuring device which has a simple structure of the water level measuring device and which can always measure an accurate water level irrespective of the pressure change in the tank by removing the element of measurement failure. Especially.

【0010】[0010]

【課題を解決するための手段】本発明は、上記目的を達
成するため、基準面器内の水位の変化を検出するレベル
スイッチをタンクと基準面器間の低圧側導圧配管と、基
準面器と差圧式水位計間の低圧側導圧配管に接続される
基準水頭管に設置すると共に基準水頭が低下した場合、
水を補給する為の基準面器と差圧式水位計間の低圧側導
圧配管に接続される給水配管及び給水配管にレベルスイ
ッチの信号に応答する補給水弁を設置し、自動的に水を
補給し、常に基準水頭を保持する。
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a level switch for detecting a change in water level in a reference surface device, a low pressure side pressure guiding pipe between a tank and a reference surface device, and a reference surface. If it is installed on the reference head pipe connected to the low pressure side pressure piping between the pressure gauge and the differential pressure type water gauge and the reference head is lowered,
A water supply pipe connected to the low-pressure side pressure piping between the reference level gauge and the differential pressure type water level gauge for replenishing water, and a water supply valve that responds to the level switch signal are installed in the water supply pipe to automatically supply water. Replenish and always maintain the standard head.

【0011】[0011]

【作用】基準面器内の水位の変化を検出するレベルスイ
ッチを設けると共に給水配管及び給水配管にレベルスイ
ッチの信号に応答する補給水弁を設置することにより、
基準水頭が低下した時に、給水配管に設置された補給水
弁をレベルスイッチの信号により自動開し、水を補給し
基準水頭に復帰することにより、常に正確な水位が測定
出来る。
[Function] By providing a level switch for detecting a change in the water level in the reference level and installing a makeup water valve that responds to the signal of the level switch in the water supply pipe and the water supply pipe,
When the reference water head drops, the make-up water valve installed in the water supply pipe is automatically opened by the signal of the level switch to replenish the water and return to the reference water head, so that an accurate water level can be measured at all times.

【0012】[0012]

【実施例】以下に、本発明の実施例を図1ないし図2に
より説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

【0013】本発明は、図1に示すようにタンク1の気
相部と水相部に、低圧側導圧配管8及び高圧側導圧配管
9の一端を接続すると共に、他端をそれぞれ差圧式水位
計3に接続し、低圧側導圧配管8の途中に基準面器を設
置する。タンク1と基準面器2間と基準面器2と差圧式
水位計3間の低圧側導圧配管8には、連通する基準水頭
管6を接続し、基準水頭管6にレベルスイッチ4及びオ
リフィス10を設置する。また、基準面器2と差圧式水
位計3間の低圧側導圧配管8に給水配管7を接続し、給
水配管7には補給水弁5を設置する。
According to the present invention, as shown in FIG. 1, one end of the low pressure side pressure guiding pipe 8 and one end of the high pressure side pressure guiding pipe 9 are connected to the gas phase portion and the water phase portion of the tank 1, and the other ends are connected to each other. It is connected to the pressure type water level gauge 3 and a reference leveling device is installed in the middle of the low pressure side pressure guiding pipe 8. A reference water head pipe 6 communicating with the low pressure side pressure piping 8 between the tank 1 and the reference surface level 2 and between the reference surface level 2 and the differential pressure type water level gauge 3 is connected to the level head 4 and the orifice. Install 10. Further, a water supply pipe 7 is connected to the low pressure side pressure guiding pipe 8 between the reference surface 2 and the differential pressure type water level gauge 3, and a makeup water valve 5 is installed in the water supplying pipe 7.

【0014】本装置は、低圧側導圧配管8の基準水頭の
低下を防止し常に正確な水位を測定するものであり、タ
ンク1の圧力がプラント負荷変動に伴い負圧となった場
合、基準面器2内の水がフラッシュによる基準水頭の低
下又はタンク側に吸い込まれることにより基準水頭が低
下した場合、その基準水頭の低下を低圧側導圧配管8に
連通し基準面器内の水位と同水位となる基準水頭管6に
設置するレベルスイッチ4で検出する。次にレベルスイ
ッチの信号により基準水頭を復帰する為に設けた給水配
管6に設置されている補給水弁5をオン/オフ制御によ
り自動開・閉し減少した基準面器内の水を補給し基準水
頭を復帰することが出来る。
This device prevents the reference water head of the low pressure side pressure guiding pipe 8 from being lowered and always measures an accurate water level. When the pressure of the tank 1 becomes a negative pressure due to the load fluctuation of the plant, When the reference water head is lowered by flushing the water in the level device 2 or being sucked into the tank side, the decrease in the reference water level is communicated with the low pressure side pressure guiding pipe 8 and used as the water level in the reference level device. It is detected by the level switch 4 installed on the reference water head tube 6 having the same water level. Next, the make-up water valve 5 installed in the water supply pipe 6 provided to restore the reference water head by the signal of the level switch is automatically opened / closed by the on / off control to replenish the reduced water in the reference leveler. The standard head can be restored.

【0015】また、基準水頭管6には、急激な水位変化
に伴う水位脈動を防止し安定した給水制御を行えるよう
オリフィス10を設置する。
Further, the reference water head pipe 6 is provided with an orifice 10 so as to prevent water level pulsation due to abrupt water level change and perform stable water supply control.

【0016】図2は、電極式レベルスイッチ4を使用し
た場合の詳細例を示したものであり、基準水頭を保って
いる場合、電極は水に接触して通電し補給水弁5に閉信
号を出し、基準水頭が低下した場合、通電が切れ開信号
を出し補給水弁5を開き水を補給する。
FIG. 2 shows a detailed example of the case where the electrode type level switch 4 is used. When the reference water head is maintained, the electrode comes into contact with water to energize, and the make-up water valve 5 is closed. When the reference water head is lowered, the power supply is cut off and an open signal is output to open the replenishment water valve 5 to replenish the water.

【0017】また、電極式レベルスイッチの一例を示し
たが、フロート式レベルスイッチ(内筒式,外筒式)等
でも使用可能である。
Although an example of the electrode type level switch is shown, a float type level switch (inner cylinder type, outer cylinder type) or the like can be used.

【0018】以上の構成とすることにより、常に基準水
頭を保持し正確な水位を得ることが出来る。
With the above structure, it is possible to always hold the reference water head and obtain an accurate water level.

【0019】[0019]

【発明の効果】本発明によれば、圧力が不安定なタンク
類においても、正確な水位測定及び水位制御をするのに
効果がある。
According to the present invention, it is effective to accurately measure and control the water level even in tanks where the pressure is unstable.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の差圧式水位測定装置の系統図。FIG. 1 is a system diagram of a differential pressure type water level measuring device of the present invention.

【図2】本発明の電極式レベルスイッチを使用した例を
示す説明図。
FIG. 2 is an explanatory view showing an example using the electrode type level switch of the present invention.

【図3】差圧式水位計測原理の説明図。FIG. 3 is an explanatory diagram of a differential pressure type water level measurement principle.

【符号の説明】[Explanation of symbols]

1…タンク、2…基準面器、3…差圧式水位計、4…レ
ベルスイッチ、5…補給水弁、6…基準水頭管、7…給
水配管、8…低圧側導圧配管、9…高圧側導圧配管、1
0…オリフィス。
1 ... Tank, 2 ... Reference level gauge, 3 ... Differential pressure type water level gauge, 4 ... Level switch, 5 ... Make-up water valve, 6 ... Reference water head pipe, 7 ... Water supply pipe, 8 ... Low pressure side pressure pipe, 9 ... High pressure Side pressure piping, 1
0 ... Orifice.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】タンクの気相部と水相部に、低圧側及び高
圧側導圧配管の一端を接続し、他端をそれぞれ差圧式水
位計に接続し、前記低圧側導圧配管の途中に基準面器を
設置する差圧式水位測定装置において、前記タンクと前
記基準面器間の前記低圧側導圧配管と、前記基準面器と
前記差圧式水位計間の前記低圧側導圧配管に接続し、連
通される基準水頭管に前記基準面器内の水位の変化を検
出するレベルスイッチを設置し、前記基準面器と前記差
圧式水位計間の前記低圧側導圧配管に基準水頭が低下し
た場合、水を補給する為の給水配管を接続し、前記給水
配管には前記レベルスイッチの信号に応答する補給水弁
を設置し、常に基準水頭を保持することを可能としたこ
とを特徴とする差圧式水位測定装置。
1. A gas phase portion and a water phase portion of a tank are connected to one end of a low pressure side and a high pressure side pressure guiding pipe, and the other end is connected to a differential pressure type water level gauge, respectively, on the way of the low pressure side pressure guiding pipe. In the differential pressure type water level measuring device to install a reference surface device, in the low pressure side pressure guiding pipe between the tank and the reference surface device, the low pressure side pressure guiding pipe between the reference surface device and the differential pressure type water level gauge A level switch for detecting a change in the water level in the reference surface device is installed in the connected reference water head pipe, and a reference head is provided in the low pressure side pressure piping between the reference surface device and the differential pressure type water gauge. When it drops, a water supply pipe for replenishing water is connected, and a water supply valve that responds to the signal of the level switch is installed in the water supply pipe, which makes it possible to always maintain the reference water head. Differential pressure type water level measuring device.
JP9652195A 1995-04-21 1995-04-21 Differential pressure type water level measuring device Pending JPH08292080A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9652195A JPH08292080A (en) 1995-04-21 1995-04-21 Differential pressure type water level measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9652195A JPH08292080A (en) 1995-04-21 1995-04-21 Differential pressure type water level measuring device

Publications (1)

Publication Number Publication Date
JPH08292080A true JPH08292080A (en) 1996-11-05

Family

ID=14167451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9652195A Pending JPH08292080A (en) 1995-04-21 1995-04-21 Differential pressure type water level measuring device

Country Status (1)

Country Link
JP (1) JPH08292080A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012145264A (en) * 2011-01-11 2012-08-02 Kawasaki Thermal Engineering Co Ltd Water supply control device for multitubular once-through boiler
JP2013205107A (en) * 2012-03-27 2013-10-07 Mitsubishi Heavy Ind Ltd Liquid level position measuring device and nuclear facility
JP2013257313A (en) * 2012-05-16 2013-12-26 Ic Sokki Kk Fluid transport vehicle of vacuum car or the like and fluid collection amount measurement method using the same
CN106643969A (en) * 2016-12-10 2017-05-10 大连福佳·大化石油化工有限公司 Open heating pot liquid level measuring system and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012145264A (en) * 2011-01-11 2012-08-02 Kawasaki Thermal Engineering Co Ltd Water supply control device for multitubular once-through boiler
JP2013205107A (en) * 2012-03-27 2013-10-07 Mitsubishi Heavy Ind Ltd Liquid level position measuring device and nuclear facility
JP2013257313A (en) * 2012-05-16 2013-12-26 Ic Sokki Kk Fluid transport vehicle of vacuum car or the like and fluid collection amount measurement method using the same
CN106643969A (en) * 2016-12-10 2017-05-10 大连福佳·大化石油化工有限公司 Open heating pot liquid level measuring system and method

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