JPH02124430A - Pressure difference compensation type flow rate measuring equipment - Google Patents
Pressure difference compensation type flow rate measuring equipmentInfo
- Publication number
- JPH02124430A JPH02124430A JP27823588A JP27823588A JPH02124430A JP H02124430 A JPH02124430 A JP H02124430A JP 27823588 A JP27823588 A JP 27823588A JP 27823588 A JP27823588 A JP 27823588A JP H02124430 A JPH02124430 A JP H02124430A
- Authority
- JP
- Japan
- Prior art keywords
- pressure difference
- flow rate
- signal
- detector
- piston
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract 1
- 230000033001 locomotion Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000005297 pyrex Substances 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Abstract
Description
【発明の詳細な説明】
１１旦正札吐ｔ１
この発明は、圧力差検出器を利用して流量検出器の前後
の圧力差の補償を行なうようにした圧力差補償形流量測
定装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure difference compensation type flow rate measuring device that uses a pressure difference detector to compensate for the pressure difference before and after a flow rate detector.
従来の技術
この種の圧力差検出器およびそれを用いた圧力差補償形
流量測定装置としては、例えば実公昭５１ ３８７７７
号「流量測定計量装置」においで開示されたものが公知
である。2. Description of the Related Art This type of pressure difference detector and pressure difference compensating flow rate measuring device using the same are disclosed in, for example, Japanese Utility Model Publication No. 51 38777.
The one disclosed in No. ``Flow Measuring and Metering Device'' is known.
これは、歯車ポンプの前後を連通ずる透明のバイパスパ
イプ中に被測定流体の比重にほぼ等しいピストンを挿入
し、その位置を充電的に検出するようにした積分圧力差
検出器を有すると共に、それと直列にばね素子を介して
固定部に取付けられたせき止め部材、とその充電検出要
素とからなる比例圧力差検出器を有し、この両信号に基
づいて歯車ポンプの駆動モータの回転を制御して歯車ポ
ンプ前後の圧力差を補償するようにしたものである。This system has an integral pressure difference detector that inserts a piston whose specific gravity is approximately equal to the specific gravity of the fluid to be measured into a transparent bypass pipe that communicates between the front and rear of the gear pump, and detects the position of the piston electrically. It has a proportional pressure difference detector consisting of a damming member attached to a fixed part via a spring element in series, and a charge detection element, and the rotation of the gear pump drive motor is controlled based on these signals. This is designed to compensate for the pressure difference before and after the gear pump.
明が しようとする課
ところで、上記歯車ポンプは急激な流量変化や逆流など
に対し一時的に動作が追従できない等高精度な流量測定
用として用いるには難点がある。However, the above-mentioned gear pump has some drawbacks when used for highly accurate flow measurement, such as the fact that its operation cannot temporarily follow sudden changes in flow rate or backflow.
これに対しては、放射状に配置された４個のピストンを
有し、それが順次流体によって往復動され、その動きを
回転部、すなわち上記４個のピストンと結合されたクラ
ンクを介して回転運動に変換し、その回転量をパルス化
して取出すようにした高精度なピストン式容積形流量検
出器（例えば、０８０−ＳＯＫＫＩ ＴＥＣＨＮＩＣＡ
Ｌ ＲＥＰＯＲＴ Ｎｏ、 ８ 、第１９〜３０頁、昭
和５９年３月３０日、株式会社小野測器発行）を採用す
ればよいが、それにおいても、圧力差検出器ではそのピ
ストンおよびせき止め部材を充電的に検出することにな
るので、不透明流体の測定には適用できない問題がある
。On the other hand, it has four pistons arranged radially, which are sequentially reciprocated by a fluid, and the movement is transmitted through a rotating part, that is, a crank connected to the four pistons, into a rotational motion. A high-precision piston-type positive displacement flow sensor (for example, 080-SOKKI TECHNICA
L REPORT No. 8, pp. 19-30, published by Ono Sokki Co., Ltd., March 30, 1980), but even in that case, the pressure difference detector does not charge its piston and dam member. Therefore, there is a problem that it cannot be applied to the measurement of opaque fluids.
また、ピストンとせき止め部材の両者を設ける必要があ
り構成が複雑、かつ全体に大型化してしまう問題点があ
る。Further, since it is necessary to provide both a piston and a dam member, there is a problem that the structure is complicated and the overall size is increased.
課題を解決するための 段
本発明は、上記課題を解決し、透明、非透明のいずれの
流体に対しても圧力差を補償した測定を、単純な構成に
て行なうようにしたらのであり、ピストン式容積形流量
検出器と、その前後と連通された非導電体のパイプ、そ
のパイプ内部に両側を仕切り、かつ振動自在に挿入され
た導電体のピストン、上記パイプの外部に配置された位
置検出用コイルを有する圧力差検出器と、上記ピストン
式容積形流量検出器の回転部と結合されたモータと、上
記圧力差検出器の出力を積分制御信号、その微分値を比
例制御信号とし、それに応じて上記モータの回転を制御
する制御回路とからなる。Steps for Solving the Problems The present invention solves the above problems and makes it possible to perform measurements with compensated pressure differences for both transparent and non-transparent fluids with a simple configuration. A positive displacement flow rate sensor, a non-conductive pipe that communicates with the front and back, a conductive piston that is partitioned on both sides and inserted into the pipe so that it can vibrate, and a position detector placed outside the pipe. a pressure difference detector having a coil for the above-mentioned, a motor coupled to the rotating part of the piston-type positive displacement flow sensor, the output of the pressure difference detector being an integral control signal, the differential value thereof being a proportional control signal, and a control circuit that controls the rotation of the motor accordingly.
また、上記のものにおいて、異常流量（過大流量、衝撃
流量）が流れた場合にピストン式容積形流量検出器の回
転部お上びモータを保護するためには両者の間をマグネ
ットカップリングにより結合することが望ましい。In addition, in the above, in order to protect the rotating part and motor of the piston-type positive displacement flow sensor in the event of an abnormal flow rate (excessive flow rate, impact flow rate), a magnetic coupling is used to connect the two. It is desirable to do so.
また、上記のものにおいて、圧力差検出器内への気泡混
入による誤検出を防止するためには、パイプは流量検出
器の下方に配置することが望まし作用
上記のものにおいて、ピストン式容積形流量検出器の前
後に圧力差が生じると、その時間に対する積分圧力差が
導電体ピストンの変位量に変換されてその位置がコイル
により電気信号に変換されて取出される。そして、その
電気信号は積分制御信号として、またその微分値は比例
制御信号としてモータの制御回路に加えられ、モータの
回転量が圧力差分だけ補償され、それにより流量検出器
の回転部からは圧力差のない状態における流量に対応し
た出力が取出される。In addition, in the above device, in order to prevent false detection due to air bubbles entering the pressure difference detector, it is desirable to place the pipe below the flow rate sensor. When a pressure difference occurs before and after the flow rate detector, the integral pressure difference over time is converted into the amount of displacement of the conductor piston, and its position is converted into an electric signal by the coil and taken out. Then, the electric signal is applied as an integral control signal, and its differential value is applied as a proportional control signal to the motor control circuit, and the rotation amount of the motor is compensated by the pressure difference. An output corresponding to the flow rate in a state where there is no difference is extracted.
実施例
第１図において、１０はピストン式容積形流量検出器で
あり、流体の入口１１．出口１２間に介入されたピスト
ン部および回転部１３、すなわち流体により順次往復動
させられる放射状に配列された４個のピストンとそのピ
ストンと結合され、上記往復動を回転運動に変換するク
ランク軸とからなる流量一回転変換ＲＭと、マグネット
カップリング１４を介してその回転をパルス信号に変換
するロータリエンコーダ１５と、そのロータリエンコー
ダ紬と結合されたサーボモータ１６とからなる。その流
量検出器１０の下方に設けられているのが圧力差検出器
２０であり、上記流量検出器１０の入口１１、出口１２
間を連通する精密パイレックスガラス管からなるパイプ
２１と、その内部の左、右のストッパ２４．２５ｆｔｆ
ｌに介入されたカーボン材よりなるフリーピストン２２
と、上記パイプ２１の外部に巻装され７１７−ピストン
２２の位置を検出する位置検出コイル２３からなり、そ
のコイル２３には第２図に示すように発振部２６から正
弦波が供給されていてフリーピストン２２とコイル２３
の相対位置により変わる上記正弦波の振幅が検波整流部
２７により検出されている。Embodiment In FIG. 1, reference numeral 10 denotes a piston-type positive displacement flow sensor, and a fluid inlet 11. A piston part and a rotating part 13 interposed between the outlet 12, that is, four radially arranged pistons that are sequentially reciprocated by fluid, and a crankshaft that is coupled to the pistons and converts the reciprocating motion into rotational motion. A rotary encoder 15 that converts the rotation into a pulse signal via a magnetic coupling 14, and a servo motor 16 coupled to the rotary encoder Tsumugi. A pressure difference detector 20 is provided below the flow rate detector 10, with an inlet 11 and an outlet 12 of the flow rate detector 10.
A pipe 21 made of a precision Pyrex glass tube communicating between the pipes and the left and right stoppers inside the pipe 21 24.25 ftf
Free piston 22 made of carbon material interposed in l
The coil 23 is wound around the outside of the pipe 21 and detects the position of the 717-piston 22.The coil 23 is supplied with a sine wave from an oscillator 26 as shown in FIG. Free piston 22 and coil 23
The amplitude of the sine wave, which changes depending on the relative position of the sine wave, is detected by the detection rectifier 27.
その検波整流された信号は、制御回路３０のＰＩＤ増幅
器３１に送られ、その信号はそのまま積分制御信号に、
その微分信号が比例制御信号に、さらに２度微分した信
号が微分制御信号とされ、サーボモータ１６の駆動制御
部３２に印加されている。The detected and rectified signal is sent to the PID amplifier 31 of the control circuit 30, and the signal is directly converted into an integral control signal.
The differential signal is used as a proportional control signal, and the signal obtained by differentiating it twice is used as a differential control signal, which is applied to the drive control section 32 of the servo motor 16.
上記のものにおいて、流量検出器１０の入口１１と出口
１２間に圧力差が生じると、その時間積分圧力差に対応
してフリーピストン２２の位置が変わり、それに応じた
出力が検波整流部２７がら取出される。続いてその信号
は、最適制御特性に応じてゲインの調整されたＰＩＤ増
幅３１を介して圧力差の積分信号、比例信号（取出信号
の微分値）、微分信号（比例信号の微分値）に変換され
、駆動制御部３２に送られ、サーボモータ１６を駆動す
る。これにより流量検出器１０のピストン部回転部１３
は、入口１１と出口１２に圧力差がない状態での流量に
比例する回転量に補償される。In the above device, when a pressure difference occurs between the inlet 11 and the outlet 12 of the flow rate detector 10, the position of the free piston 22 changes corresponding to the time-integrated pressure difference, and the corresponding output is changed from the detection rectifier 27. taken out. Next, the signal is converted into an integral signal of the pressure difference, a proportional signal (differential value of the extracted signal), and a differential signal (differential value of the proportional signal) via the PID amplifier 31 whose gain is adjusted according to the optimal control characteristics. is sent to the drive control section 32 and drives the servo motor 16. As a result, the piston rotating portion 13 of the flow rate detector 10
is compensated for by an amount of rotation proportional to the flow rate when there is no pressure difference between the inlet 11 and the outlet 12.
しかして、この圧力差検出器２０においては、流体の透
明、不透明に係わらず圧力差が検出されるので、流体を
選ばず測定を行なうことができる。Since the pressure difference detector 20 detects the pressure difference regardless of whether the fluid is transparent or opaque, measurement can be performed regardless of the fluid.
また、回転の伝達経路にマグネットカップリング１４が
介在されているので、異常流量時においてら、流量検出
器１０のピストン部回転［１３とロータリエンコーグ１
５、サーボモータ１６を保護する。同時に回転伝達経路
の摩擦が低減されるので制御特性が向上し、高精度とな
る。In addition, since the magnetic coupling 14 is interposed in the rotation transmission path, the piston part rotation [13 of the flow rate detector 10 and the rotary encoder 1
5. Protect the servo motor 16. At the same time, friction in the rotation transmission path is reduced, resulting in improved control characteristics and higher precision.
尚、上記実施例においては、積分、比例、微分信号を用
いる場合を例示したが、モータによっては微分信号を省
いても同様の制御を行なうことができる。Incidentally, in the above embodiment, the case where integral, proportional, and differential signals are used is exemplified, but depending on the motor, similar control can be performed even if the differential signal is omitted.
発明の効果
以上のとおりであり、本発明は流量検出器の流体入口と
出口間を連通ずるパイプ中に導電体のピストンを挿入し
、その外周に配置したコイルに上り積分圧力差に対応し
たピストン位置を検出してその検出出力およびそれを微
分して形成した出力によりモータの回転量を制御し、そ
れにより圧力差の補償を行なうものであり、簡単な構成
でありながら、高精度な補償を行なうことができる。The effects of the invention are as described above, and the present invention involves inserting a conductive piston into a pipe that communicates between the fluid inlet and outlet of a flow rate detector, and a piston that responds to the integral pressure difference by inserting a conductive piston into a coil arranged around the outer circumference of the piston. It detects the position and controls the rotation amount of the motor using the detected output and the output formed by differentiating it, thereby compensating for the pressure difference. Although it has a simple configuration, it can perform high-precision compensation. can be done.
第１図は本発明の実施例を示す一部断面を有する正面図
、第２図は圧力差検出器と制御回路の結線関係を示すブ
ロック線図である。
０・・・ピストン式容積形流量検出器、２０・・・圧力
差検出器、２１・・・パイプ、２２・・・フリーピスト
ン、２３・・・位置検出コイル。
１６寸−本“で−り
十１隠
才２（至）FIG. 1 is a partially sectional front view showing an embodiment of the present invention, and FIG. 2 is a block diagram showing the connection relationship between a pressure difference detector and a control circuit. 0... Piston type volumetric flow rate detector, 20... Pressure difference detector, 21... Pipe, 22... Free piston, 23... Position detection coil. 16 cm - Book 11 Hidden Talents 2 (To)
Claims (1)
れた非導電体のパイプ、そのパイプ内部に両側を仕切り
、かつ振動自在に挿入された導電体のピストン、上記パ
イプの外部に配置された位置検出用コイルを有する圧力
差検出器と、上記ピストン式容積形流量検出器の回転部
と結合されたモータと、上記圧力差検出器の出力を積分
制御信号、その微分値を比例制御信号とし、それに応じ
て上記モータの回転を制御する制御回路とからなるとこ
ろの圧力差補償形流量測定装置。 ２、上記モータはマグネットカップリングを介して回転
部と結合されたことを特徴とする請求項１に記載の圧力
差補償形流量測定装置。 ３、上記パイプは流量検出器の下方に配置したことを特
徴とする請求項１に記載の圧力差補償形流量測定装置。[Scope of Claims] 1. A piston-type positive displacement flow rate sensor, a non-conductive pipe connected to the front and back thereof, and a conductive piston partitioned on both sides and inserted into the pipe so as to be able to vibrate freely; A pressure difference detector having a position detection coil disposed outside the pipe, a motor coupled to the rotating part of the piston-type positive displacement flow sensor, and an integral control signal for the output of the pressure difference detector; A pressure difference compensating flow rate measuring device comprising a control circuit that uses a differential value as a proportional control signal and controls the rotation of the motor in accordance with the differential value. 2. The pressure difference compensated flow rate measuring device according to claim 1, wherein the motor is coupled to a rotating part via a magnetic coupling. 3. The pressure difference compensated flow rate measuring device according to claim 1, wherein the pipe is disposed below a flow rate detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27823588A JPH02124430A (en) | 1988-11-02 | 1988-11-02 | Pressure difference compensation type flow rate measuring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27823588A JPH02124430A (en) | 1988-11-02 | 1988-11-02 | Pressure difference compensation type flow rate measuring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02124430A true JPH02124430A (en) | 1990-05-11 |
Family
ID=17594501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27823588A Pending JPH02124430A (en) | 1988-11-02 | 1988-11-02 | Pressure difference compensation type flow rate measuring equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02124430A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004303030A (en) * | 2003-03-31 | 2004-10-28 | Sanyo Electric Co Ltd | Controller and discharge controller |
| JP2007309727A (en) * | 2006-05-17 | 2007-11-29 | Oval Corp | Servo-type volumetric flowmeter using secondary flowmeter |
| WO2008096665A1 (en) | 2007-02-05 | 2008-08-14 | Oval Corporation | Path structure for flow and differential-pressure detections in servo-type displacement flowmeter |
| JP2012181083A (en) * | 2011-03-01 | 2012-09-20 | Ono Sokki Co Ltd | Volumetric flowmeter |
| JP2016504602A (en) * | 2013-01-30 | 2016-02-12 | アー・ファウ・エル・リスト・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Flowmeter |
| JP2020020679A (en) * | 2018-08-01 | 2020-02-06 | 株式会社小野測器 | Volumetric flow rate detector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS513877U (en) * | 1974-06-25 | 1976-01-12 | ||
| JPS57131017A (en) * | 1981-02-05 | 1982-08-13 | Inoue Japax Res Inc | Flow meter |
| JPS5819511A (en) * | 1981-07-28 | 1983-02-04 | Oval Eng Co Ltd | Servo-type volume flowmeter |
-
1988
- 1988-11-02 JP JP27823588A patent/JPH02124430A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS513877U (en) * | 1974-06-25 | 1976-01-12 | ||
| JPS57131017A (en) * | 1981-02-05 | 1982-08-13 | Inoue Japax Res Inc | Flow meter |
| JPS5819511A (en) * | 1981-07-28 | 1983-02-04 | Oval Eng Co Ltd | Servo-type volume flowmeter |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004303030A (en) * | 2003-03-31 | 2004-10-28 | Sanyo Electric Co Ltd | Controller and discharge controller |
| JP4497829B2 (en) * | 2003-03-31 | 2010-07-07 | 三洋電機株式会社 | Transmission control device |
| JP2007309727A (en) * | 2006-05-17 | 2007-11-29 | Oval Corp | Servo-type volumetric flowmeter using secondary flowmeter |
| WO2008096665A1 (en) | 2007-02-05 | 2008-08-14 | Oval Corporation | Path structure for flow and differential-pressure detections in servo-type displacement flowmeter |
| US7905141B2 (en) | 2007-02-05 | 2011-03-15 | Oval Corporation | Path structure related to flow of fluid to be measured and pressure difference detection in servo type volumetric flowmeter |
| JP2012181083A (en) * | 2011-03-01 | 2012-09-20 | Ono Sokki Co Ltd | Volumetric flowmeter |
| JP2016504602A (en) * | 2013-01-30 | 2016-02-12 | アー・ファウ・エル・リスト・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Flowmeter |
| JP2020020679A (en) * | 2018-08-01 | 2020-02-06 | 株式会社小野測器 | Volumetric flow rate detector |
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