JPH05181538A - Flow rate controller - Google Patents
Flow rate controllerInfo
- Publication number
- JPH05181538A JPH05181538A JP34572891A JP34572891A JPH05181538A JP H05181538 A JPH05181538 A JP H05181538A JP 34572891 A JP34572891 A JP 34572891A JP 34572891 A JP34572891 A JP 34572891A JP H05181538 A JPH05181538 A JP H05181538A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- valves
- valve
- valve seat
- passage area
- 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.)
- Granted
Links
Landscapes
- Feedback Control In General (AREA)
- Flow Control (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、流体が流れる管路に複
数のバルブを並列に介装し、この複数のバルブの開閉の
組合わせにより管路に流れる流量を制御する流量制御装
置、特に燃料電池発電装置における改質原料の流量制御
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate control device, in which a plurality of valves are provided in parallel in a pipeline through which a fluid flows and the flow rate of the pipeline is controlled by a combination of opening and closing of the plurality of valves. The present invention relates to a reforming raw material flow rate control device in a fuel cell power generator.
【０００２】[0002]
【従来の技術】燃料改質器と燃料電池とを主要構成部と
する燃料電池発電装置において、原燃料からなる改質原
料は、燃料電池の負荷電流に比例させた量に流量制御さ
れて燃料改質器に供給され、燃料改質器にて水素に富む
ガスに改質されて燃料電池に供給される。そしてこの改
質されたガスと同時に供給される空気とにより燃料電池
は電池反応を起こして発電する。2. Description of the Related Art In a fuel cell power generator having a fuel reformer and a fuel cell as main components, a reforming raw material composed of raw fuel is flow-controlled to an amount proportional to the load current of the fuel cell. The gas is supplied to the reformer, is reformed into a gas rich in hydrogen in the fuel reformer, and is supplied to the fuel cell. Then, the fuel cell causes a cell reaction by the air supplied together with the reformed gas to generate electricity.
【０００３】この際、負荷に供給する燃料電池の出力電
流の応答性は改質原料の流量制御の応答性に左右される
ので、改質原料が流れる管路に弁座口径、すなわち弁座
流路断面積の異なる複数のバルブを並列に介装し、この
バルブの開閉の組合わせで流量を制御し、早い応答性を
得るようにしている。At this time, since the responsiveness of the output current of the fuel cell supplied to the load depends on the responsiveness of the flow control of the reforming raw material, the valve seat diameter, that is, the valve seat flow is formed in the pipeline through which the reforming raw material flows. A plurality of valves with different road cross-sectional areas are installed in parallel, and the flow rate is controlled by the combination of opening and closing of these valves to obtain a quick response.
【０００４】このような複数の弁座流路面積の異なるバ
ルブの開閉の組合わせによる流量制御として図８に示す
系統のものが知られている。図８において、流体が流れ
る管路１５に複数の弁座流路面積の異なるバルブ２１，
２２，２３・・・等を並列に配設した並列管路３０（以
下これをデジタルバルブ３０という）が介装されてい
る。なお、バルブには弁座流路面積の大きさに対応して
開度量の重みが順次大きくなる整数でつけられている。As a flow rate control by a combination of opening and closing of a plurality of valves having different valve seat flow passage areas, a system shown in FIG. 8 is known. In FIG. 8, a plurality of valves 21 having different valve seat passage areas are provided in a pipe line 15 through which a fluid flows.
A parallel conduit 30 (hereinafter, referred to as a digital valve 30) in which 22, 22, ... In addition, the valve is provided with an integer that sequentially increases the weight of the opening amount according to the size of the valve seat flow passage area.
【０００５】流量コントローラ１７は管路１５に設けら
れた流量計１６で検出した流量の信号と、管路１５に流
すべき設定流量の信号とが入力され、設定流量が管路１
５に流れるようにデジタルバルブ３０のバルブ２１，２
２，２３・・・の開閉の組合わせを制御する操作量の信
号を出力する。この際、流量計１６での検出流量と設定
流量との偏差に応じた量の信号が偏差がある間前記操作
量の信号に加算される。The flow rate controller 17 receives a flow rate signal detected by a flow meter 16 provided in the pipeline 15 and a set flow rate signal to be flown in the pipeline 15, and the set flow rate is determined by the pipeline 1.
Valve 21 and 2 of the digital valve 30 to flow to 5
A signal of an operation amount for controlling the combination of opening and closing 2, 23 ... Is output. At this time, a signal of an amount corresponding to the deviation between the flow rate detected by the flow meter 16 and the set flow rate is added to the signal of the operation amount while there is a deviation.
【０００６】デジタル変換器である２進数変換器１９は
流量コントローラ１７からの操作量の信号を２進数に変
換し、この２進数によりバルブの開，閉信号を出力し、
デジタルバルブ３０のバルブ２１，２２，２３・・・の
開閉するバルブの組合わせを制御する。この場合開閉す
るバルブの組合わせを制御する操作量は、開になるバル
ブの開度量の重みの和に対応するものとし、流量コント
ローラ１７からの操作量は上記のように２進数に変換さ
れ、開，閉になるバルブが制御される。A binary number converter 19, which is a digital converter, converts the manipulated variable signal from the flow rate controller 17 into a binary number, and outputs a valve open / close signal by this binary number.
Controls the combination of valves 21, 22, 23 ... That open and close the digital valve 30. In this case, the operation amount for controlling the combination of the valves to be opened and closed corresponds to the sum of the weights of the opening amounts of the valves to be opened, and the operation amount from the flow rate controller 17 is converted into a binary number as described above, The valve that opens and closes is controlled.
【０００７】このような構成により、管路１５に流すべ
き流量を設定し、この設定流量を流量コントローラ１７
に入力すれば、流量計１６での検出流量がフィードバッ
クされ、流量コントローラ１７から設定流量に対応する
操作量の信号が出力される。この操作量の信号は２進数
変換器１９にて２進数にデジタル変換され、この２進数
による開，閉信号によりデジタルバルブ３０のバルブ２
１，２２，２３・・・の開閉の組合わせを制御して、管
路１５に設定流量が流れるように流量制御が行なわれ
る。With such a configuration, the flow rate to be flown to the pipe 15 is set, and this set flow rate is set to the flow rate controller 17
Input to, the flow rate detected by the flow meter 16 is fed back, and the flow rate controller 17 outputs a signal of the manipulated variable corresponding to the set flow rate. The signal of this operation amount is digitally converted into a binary number by the binary number converter 19, and the valve 2 of the digital valve 30 is opened by the open / close signal by this binary number.
The flow rate is controlled so that the set flow rate flows through the conduit 15 by controlling the combination of opening, closing, 1, 2, 23, ....
【０００８】[0008]
【発明が解決しようとする課題】上記の弁座流路面積の
異なる複数のバルブからなるデジタルバルブにおける流
量制御は、開閉するバルブの組合わせで流量が決まる
が、バルブの製造精度が悪いと、組合わされるバルブの
弁座流路面積の合計である流路面積に対して実流量が直
線状に比例せず、流路面積が大きく増加する点で振動を
起こしたり、流量制御に大きな遅れが生じるという問題
がある。In the flow rate control of a digital valve consisting of a plurality of valves having different valve seat flow passage areas, the flow rate is determined by the combination of valves to be opened and closed. However, if the valve manufacturing accuracy is poor, The actual flow rate is not linearly proportional to the flow passage area, which is the sum of the valve seat flow passage areas of the combined valves, causing vibrations at the point where the flow passage area increases significantly and causing a large delay in flow rate control. There is a problem that it will occur.
【０００９】また、大きな弁座流路断面積を有するバル
ブを開閉すると、開閉の切替え時に流量が大きく変動す
るという問題がある。Further, when a valve having a large valve seat passage cross-sectional area is opened / closed, there is a problem that the flow rate fluctuates greatly when switching the opening / closing.
【００１０】本発明の目的は、バルブの弁座流路面積の
製造精度が悪くても組合わされる弁座流路面積に流れる
流量の振動を防止し、また大きな弁座流路面積のバルブ
を開閉しても開閉の切替え時に流量が大きく変動しない
デジタルバルブを提供することである。An object of the present invention is to prevent the vibration of the flow rate flowing in the combined valve seat passage area even if the valve seat passage area of the valve is not manufactured with high precision, and to provide a valve having a large valve seat passage area. It is an object of the present invention to provide a digital valve in which the flow rate does not fluctuate significantly when switching between opening and closing even when opening and closing.
【００１１】[0011]
【課題を解決するための手段】上記課題を解決するため
に、本発明によれば、流体が流れる管路に介装され、異
なる開度量の重みをつけた複数のバルブを並列に配設し
た並列管路と、前記管路に設定流量が流れるように前記
複数のバルブの開閉の組合わせを制御する操作量の信号
を出力する流量コントローラと、このコントローラから
の操作量の信号を前記複数のバルブの開閉の組合わせを
行なう開，閉信号に変換するデジタル変換器とを備える
流量制御装置において、大きな開度量を有するバルブの
弁座流路面積を、これより小さい開度量を有するバルブ
の弁座流路面積の合計より小さくするとともに、流量コ
ントローラからの操作量の信号を、開にしたバルブの弁
座流路面積の合計に比例するように開度量の重みの合計
である開度量の信号に変換してデジタル変換器に入力さ
せる開度量変換器を備えるものとする。In order to solve the above-mentioned problems, according to the present invention, a plurality of valves, which are interposed in a pipe through which a fluid flows and are weighted with different opening amounts, are arranged in parallel. A parallel pipeline, a flow rate controller that outputs a signal of a manipulated variable that controls a combination of opening and closing of the plurality of valves so that a set flow rate flows in the pipeline, and a signal of the manipulated variable from the controller, which is a signal of the manipulated variable. In a flow rate control device including a digital converter for converting into an open / close signal for performing a combination of opening and closing of a valve, a valve seat flow passage area of a valve having a large opening amount is reduced to a valve valve of a valve having a smaller opening amount. It is smaller than the total seat channel area, and the signal of the manipulated variable from the flow rate controller is proportional to the total valve seat channel area of the opened valve. It is converted into shall comprise opening amount converter for input to the digital converter.
【００１２】また、異なる開度量の重みをつけた複数の
バルブは、異なる弁座流路面積を有するバルブと、この
うちのいずれの弁座流路面積より大きく、かつ同一の弁
座流路面積を有する数個のバルブとから構成するものと
する。[0012] Further, the plurality of valves weighted with different opening amounts are different from valves having different valve seat passage areas and larger than any of the valve seat passage areas and having the same valve seat passage area. And several valves having
【００１３】[0013]
【作用】流量制御されて開になったバルブの弁座流路面
積の合計である流路面積が大きく変化する点がある場
合、この点で実流量が少ないため流路面積を増加する
と、実流量が多くなりすぎ、また流路面積を減少すると
実流量が少なくなりすぎるので、この点で流量の振動が
生じる。When the flow passage area, which is the sum of the valve seat flow passage areas of the valve that has been opened due to the flow rate control, has a large change, the actual flow rate is small at this point and the flow passage area is increased. If the flow rate becomes too large, and if the flow passage area is reduced, the actual flow rate becomes too small, so that flow rate oscillation occurs at this point.
【００１４】この点は、弁座流路面積の大きなバルブと
この弁座流路面積より小さい組合わされた数個のバルブ
との切替え点であり、この点では流路面積が大きく増加
するので、流量の振動が生じる。したがって弁座流路面
積の大きなバルブの当該流路面積をこの弁座流路面積よ
り小さいバルブの当該弁座流路面積の合計より小さくす
ることにより、実流量が少ないため流路面積を増加す
る、すなわち大きな弁座流路面積のバルブに切替える
と、流路面積が小さくなった割合だけ一時実流量が減少
するが、実流量が少ない信号がフィードバックされるの
で、流路面積を実流量と合うまで増加していくことにな
り、流量の振動を起こすことがなくなる。This point is a switching point between a valve having a large valve seat flow passage area and several valves combined with each other having a smaller valve seat flow passage area. At this point, the flow passage area greatly increases. Flow rate oscillations occur. Therefore, by making the flow passage area of a valve having a large valve seat flow passage area smaller than the total of the valve seat flow passage areas of valves having a smaller valve seat flow passage area, the flow passage area is increased because the actual flow rate is small. That is, when switching to a valve with a large valve seat flow passage area, the actual flow rate temporarily decreases by the rate at which the flow passage area becomes smaller, but a signal with a small actual flow rate is fed back, so the flow passage area matches the actual flow rate. Therefore, the flow rate will not oscillate.
【００１５】また流量コントローラからの操作量の信号
を、開になったバルブの弁座流路面積の合計の流路面積
に直線状に比例するように開度量の重みの合計である開
度量に変換させる開度量変換器を設けたことにより、前
述のように大きな弁座流路面積のバルブの当該弁座流路
面積がこれより小さい弁座流路面積のバルブの当該弁座
流路面積の合計より小さくしても、一時的に流量が減少
する点を避けることができ、設定流量に対する実流量の
応答が早くなる。Further, the operation amount signal from the flow rate controller is linearly proportional to the total flow passage area of the valve seat flow passage areas of the opened valve, and is set to the opening amount which is the sum of the weights of the opening amounts. By providing the opening amount converter for converting, as described above, the valve seat flow passage area of the valve having the large valve seat flow passage area is smaller than the valve seat flow passage area of the valve having the smaller valve seat flow passage area. Even if it is smaller than the total, it is possible to avoid the point where the flow rate temporarily decreases, and the response of the actual flow rate to the set flow rate becomes faster.
【００１６】なお、開度量変換装置からの開度量の信号
はデジタル変換器にて開，閉信号に対応するデジタル信
号に変換され、このデジタル信号により開閉するバルブ
の組合わせを制御する。The opening amount signal from the opening amount conversion device is converted by a digital converter into a digital signal corresponding to the open / close signal, and the combination of valves to be opened / closed is controlled by this digital signal.
【００１７】また、弁座流路面積が大きいバルブを開閉
すると、バルブの切替え時に瞬間、流量が大きく変動す
るが、バルブの弁座流路面積の上限をこの流量変動を許
容できる値にしたバルブを、流量の大きいところで数個
使用し、開閉するバルブの組合わせを前記開度量変換器
を介してデジタル変換器により制御すれば、バルブ切替
え時の流量変動を許容値以下にすることができる。When a valve having a large valve seat passage area is opened and closed, the flow rate fluctuates greatly at the moment of switching the valve. However, the valve seat passage area of the valve has an upper limit value that allows the flow rate variation. If a plurality of valves are used at a high flow rate and the combination of valves to be opened and closed is controlled by the digital converter via the opening degree converter, the flow rate fluctuation at the time of valve switching can be made equal to or less than the allowable value.
【００１８】[0018]
【実施例】以下図面に基づいて本発明の実施例について
説明する。図１は本発明の実施例による流量制御の制御
ブロック図である。なお図１及び後述する図５において
図８の従来例と同一部品には同じ符号を付し、その説明
を省略する。図１において従来例と異なるのは、後述の
ように異なる開度量の重みをつけ、弁座流路面積の異な
るバルブ１ないし８を並列に配設してなるデジタルバル
ブ３１と、流量コントローラ１７からの操作量の信号
が、開になったバルブの弁座流路面積の合計に直線状に
比例するように開度量の信号に変換して２進数変換器１
９に入力させる開度量変換器２０とを設けたことであ
る。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a control block diagram of flow rate control according to an embodiment of the present invention. In FIG. 1 and FIG. 5 described later, the same parts as those in the conventional example of FIG. 8 are designated by the same reference numerals, and the description thereof will be omitted. 1 differs from the conventional example in that a digital valve 31 in which valves 1 to 8 having different valve seat flow passage areas are arranged in parallel by weighting different opening amounts as described later and a flow rate controller 17 are provided. Is converted into a signal of the opening amount so as to be linearly proportional to the total valve seat flow passage area of the opened valve, and the binary number converter 1
That is, the opening amount converter 20 for inputting to 9 is provided.
【００１９】ここで開度量変換器２０から出力される開
度量は前述のように開になったバルブの開度量の重みの
合計であり、バルブ１ないし８の開度量の重みは図２に
示す値にしている。Here, the opening amount output from the opening amount converter 20 is the sum of the weights of the opening amounts of the valves opened as described above, and the weights of the opening amounts of the valves 1 to 8 are shown in FIG. It has a value.
【００２０】またバルブ１ないし８の弁座流路面積は、
開度量の重みが１である弁座流路面積を基準とし、この
基準に対する弁座流路面積の比である流路面積比で表わ
し、図２に示す値を有している。Further, the valve seat flow passage areas of the valves 1 to 8 are
The valve seat flow passage area whose weight of the opening amount is 1 is used as a reference, and is represented by a flow passage area ratio which is a ratio of the valve seat flow passage area to the reference, and has values shown in FIG.
【００２１】ここで流体が流れるバルブの流路面積比
は、所定の弁座流路面積より少し小さ目に製造し、流れ
る流量の実測により算定する。そしてこの算定された流
路面積比は図２に示すようにバルブ１ないし８の各開度
量の重みに対応している。Here, the flow passage area ratio of the valve through which the fluid flows is made slightly smaller than the predetermined valve seat flow passage area, and is calculated by actual measurement of the flow rate. The calculated flow path area ratio corresponds to the weight of each opening amount of the valves 1 to 8 as shown in FIG.
【００２２】ここで、大きなバルブの流路面積比は、こ
れより小さい流路面積比を有するバルブの当該流路面積
比の合計より小さくしている。例えばバルブ６の流路面
積比３０はバルブ１ないし５の流路面積比の合計である
３１より小さくしている。Here, the flow passage area ratio of the large valve is set smaller than the sum of the flow passage area ratios of the valves having the smaller flow passage area ratio. For example, the flow passage area ratio 30 of the valve 6 is smaller than 31 which is the sum of the flow passage area ratios of the valves 1 to 5.
【００２３】このようなバルブの開度量、すなわち開に
なるバルブの開度量とこれらのバルブを流れる流量との
関係を図３に示す。ここで開度量が１６ならばバルブ５
が開になり、開度量が１２８ならばバルブ８が開にな
り、開度量が２５５ならばバルブ１ないし８の全バルブ
が開く。なお流量はバルブ前後の圧力損失を一定にした
ときの流量を示す。図３においてＡ，Ｂ，Ｃ，Ｄ，Ｅ，
Ｆ，Ｇ部では、バルブ６，７，８の弁座流路面積がこれ
より小さいバルブの弁座流路面積の合計より小さいの
で、流量は開度量に対し落ち込み部分を有している。FIG. 3 shows the relationship between the opening amounts of the valves, that is, the opening amounts of the valves to be opened and the flow rates of these valves. If the opening amount is 16 here, the valve 5
When the opening amount is 128, the valve 8 is opened, and when the opening amount is 255, all the valves 1 to 8 are opened. The flow rate indicates the flow rate when the pressure loss before and after the valve is constant. In FIG. 3, A, B, C, D, E,
In the F and G portions, the valve seat flow passage areas of the valves 6, 7, and 8 are smaller than the total valve seat flow passage areas of the smaller valves, so that the flow rate has a drop portion with respect to the opening amount.
【００２４】このような落ち込み部分は操作量と開度量
との関係を適切にとることにより除くことができる。図
４はこのような操作量と開度量との関係を示す図であ
る。図４において、例えば前記Ｄ部の流量の落ち込み部
分はＤ1 点の操作量１１６のとき開度量を１２７、Ｄ2
点の操作量１１７のとき開度量１４５にすることによ
り、操作量１１６のときは開度量１２７に対応するバル
ブ１ないし７が開になり、操作量１１７のときは開度量
１４５に対応するバルブ１，５，８が開になり、このと
きの流量は図３によりＤ1 点の開度量１２７（操作量１
１６）に対応する２７．６，Ｄ2 点の開度量１４５（操
作量１１７）に対応する２７．８となり、流量の落ち込
み部分を除いたことになる。なお、他の流量の落ち込み
部分もこのようにして除くことができる。Such a depressed portion can be removed by appropriately taking the relationship between the manipulated variable and the opening amount. FIG. 4 is a diagram showing the relationship between such an operation amount and an opening amount. In FIG. 4, for example, when the operation amount 116 at the point D 1 is 127, the opening amount of the drop portion of the flow rate at the D portion is 127, and the opening amount is D 2.
When the operation amount 117 of the point is set to the opening amount 145, the valves 1 to 7 corresponding to the opening amount 127 are opened when the operation amount 116 is set, and the valve 1 corresponding to the opening amount 145 is opened when the operation amount 117 is set. , 5,8 is opened, opening amount 127 (operation amount 1 of D 1 point by the flow rate is 3 in this case
16) corresponding to 27.6, the opening amount 145 at D 2 point (operation amount 117) becomes 27.8, which means that the flow rate drop portion is removed. Note that other flow rate drop portions can be removed in this manner.
【００２５】したがって図４に基づく操作量と開度量と
の関係に基づいて開度量変換器２０にて流量コントロー
ラ５からの操作量の信号を開度量の信号に変換し、この
変換した開度量の信号を８ビットからなる２進数変換器
１９に入力することにより、開度量に応じたバルブの開
閉が制御され、操作量と流量とは直線状に比例する。Therefore, the opening amount converter 20 converts the signal of the operation amount from the flow rate controller 5 into a signal of the opening amount based on the relationship between the operation amount and the opening amount based on FIG. By inputting the signal to the 8-bit binary number converter 19, opening / closing of the valve is controlled according to the opening amount, and the operation amount and the flow rate are linearly proportional.
【００２６】図５は本発明の異なる実施例による流量制
御の制御ブロック図である。図５においてデジタルバル
ブ３２をバルブ１ないし１２の１２個のバルブを並列に
配設して構成し、バルブ１ないし１２の各バルブの開度
量の重みと流路面積比を図６に示すようにとり、さらに
２進数変換器１９に１２ビットを使用した他は図１と同
じである。FIG. 5 is a control block diagram of flow rate control according to a different embodiment of the present invention. In FIG. 5, the digital valve 32 is configured by arranging twelve valves 1 to 12 in parallel, and the weight of the opening amount of each valve of the valves 1 to 12 and the flow passage area ratio are taken as shown in FIG. Further, it is the same as FIG. 1 except that 12 bits are used for the binary number converter 19.
【００２７】なお、図６において流量の大きいところで
のバルブ６ないし１２における流路面積比は、バルブの
切替え時、流量の変動を許容できる大きさにした量とす
る同一の流路面積比３０にしている。In FIG. 6, the flow passage area ratios of the valves 6 to 12 at the large flow rate are set to the same flow passage area ratio 30 which is set to an amount which allows the fluctuation of the flow rate when the valves are switched. ing.
【００２８】このような開度量の重みと流路面積比を有
するバルブ１ないし１２のデジタルバルブ３２におい
て、図７に示すように操作量と開度量との関係に基づい
て開度量変換器２０にて操作量を開度量に変換し、この
変換した開度量を２進数変換器１９にて２進数にデジタ
ル変換してバルブ１ないし１２のうち開閉するバルブの
組合わせを制御する。In the digital valves 32 of the valves 1 to 12 having such a weight of the opening amount and the flow passage area ratio, the opening amount converter 20 is connected to the opening amount converter 20 based on the relationship between the manipulated variable and the opening amount as shown in FIG. Then, the manipulated variable is converted into an opening amount, and the converted opening amount is digitally converted into a binary number by the binary number converter 19 to control the combination of the valves 1 to 12 to be opened and closed.
【００２９】このように開閉するバルブの組合わせを制
御することにより、直接バルブの開閉に関与しない開度
量が多くなり、例えば図７においてＨ点で操作量１８１
のとき開度量１０２３，Ｉ点で操作量１８２のとき開度
量２０１８となり、関与しない開度量が大きくなるが、
弁座流路面積の大きなバルブを使用しないのでバルブ切
替え時の流量変動を小さくできる。なお、操作量と流量
とは前述と同じように直線状に比例する関係を有してい
る。By controlling the combination of the valves that open and close in this way, the opening amount that does not directly relate to the opening and closing of the valves increases, and for example, the manipulated variable 181 at point H in FIG.
When the opening amount 1023 is the operation amount 182 at the point I, the opening amount 2018 becomes the opening amount 2018, and the opening amount not involved increases.
Since a valve with a large valve seat flow passage area is not used, fluctuations in flow rate when switching valves can be reduced. It should be noted that the operation amount and the flow rate have a linearly proportional relationship as described above.
【００３０】前記実施例ではデジタルバルブのバルブ数
を８，１２にして説明したが、必要とする流量とバルブ
の流量特性とによりバルブの数を増減してもよい。Although the number of digital valves is 8 and 12 in the above embodiment, the number of valves may be increased or decreased depending on the required flow rate and the flow rate characteristic of the valve.
【００３１】[0031]
【発明の効果】以上の説明から明らかなように、複数の
異なる開度量の重みをつけたバルブを並列してなるデジ
タルバルブを、大きな弁座流路面積を有するバルブの当
該弁座流路面積はこれより小さな弁座流路面積を有する
バルブの当該弁座流路面積の合計より小さくし、流量コ
ントローラからの操作量の信号を操作量と開度量との適
切な関係に基づいて開度量変換器で開度量に変換し、こ
の開度量を２進数に変換して開閉するバルブの組合わせ
を制御することにより、弁座流路面積の合計である流路
面積を増加するとき、流路面積が大きく増加する点がな
くなるので、流量の振動がなくなり、応答性が早く、安
定した流量制御が得られる。As is apparent from the above description, a digital valve in which a plurality of weighted valves having different degrees of opening are arranged in parallel is used as a valve having a large valve seat passage area. Is smaller than the sum of the valve seat flow passage areas of valves having a smaller valve seat flow passage area, and the operation amount signal from the flow rate controller is converted to the opening amount conversion based on the appropriate relationship between the operation amount and the opening amount. When the flow passage area, which is the sum of the valve seat flow passage area, is increased by controlling the combination of valves that are opened and closed by converting the opening amount into a binary number by controlling the flow passage area Since there is no point at which the flow rate greatly increases, flow rate vibration is eliminated, and responsiveness is fast and stable flow rate control can be obtained.
【００３２】また流量の大きなところでは、複数のバル
ブのうち数個の大きな弁座流路面積のバルブの当該弁座
流路面積をバルブ切替え時の流量の変動を許容できる大
きさにすることにより、バルブ切替え時の流量の変動を
許容値以下にすることができる。Further, in a place where the flow rate is large, by making the valve seat flow passage area of several valves having a large valve seat flow passage area large among the plurality of valves, the fluctuation of the flow rate at the time of valve switching can be allowed. The fluctuation of the flow rate at the time of switching the valve can be kept below the allowable value.
【００３３】また、大きなバルブの弁座流路面積をこれ
より小さいバルブの弁座流路面積の合計より小さくし、
操作量を開度量に変換する開度量変換器を介して開閉す
るバルブの組合わせを制御することにより、流路面積を
増加するとき、流路面積が大きく増加する点がないの
で、バルブを製造するときの弁座流路面積の誤差は吸収
され、このため高精度の製造技術を要求する必要がなく
なるという効果がある。Further, the valve seat passage area of a large valve is made smaller than the sum of the valve seat passage areas of smaller valves,
By controlling the combination of valves that open and close via the opening amount converter that converts the manipulated variable into the opening amount, there is no point where the flow passage area increases significantly when the flow passage area is increased. The error of the valve seat flow passage area at the time of performing is absorbed, so that there is an effect that it is not necessary to request a highly accurate manufacturing technique.
【図１】本発明の実施例による流量制御装置の制御ブロ
ック図FIG. 1 is a control block diagram of a flow rate controller according to an embodiment of the present invention.
【図２】図１の流量制御装置における複数のバルブの開
度量の重みと弁座流路面積の比である流路面積比との関
係を示す図FIG. 2 is a diagram showing a relationship between weights of opening amounts of a plurality of valves and a flow passage area ratio which is a ratio of valve seat flow passage areas in the flow control device of FIG.
【図３】図１の流量制御装置における開度量と流量との
関係を示す図FIG. 3 is a diagram showing a relationship between an opening amount and a flow rate in the flow control device of FIG.
【図４】図１の流量制御装置における操作量と開度量と
の関係を示す図FIG. 4 is a diagram showing a relationship between an operation amount and an opening amount in the flow rate control device of FIG.
【図５】本発明の異なる実施例による流量制御装置の制
御ブロック図FIG. 5 is a control block diagram of a flow rate controller according to another embodiment of the present invention.
【図６】図５の流量制御装置におけるバルブの開度量の
重みと弁座流路面積の比である流路面積比との関係を示
す図6 is a diagram showing a relationship between a weight of an opening amount of a valve and a flow passage area ratio, which is a ratio of a valve seat flow passage area, in the flow control device of FIG.
【図７】図５の流量制御装置における操作量と開度量と
の関係を示す図7 is a diagram showing a relationship between an operation amount and an opening amount in the flow rate control device of FIG.
【図８】従来の流量制御装置の制御ブロック図FIG. 8 is a control block diagram of a conventional flow rate control device.
１ バルブ ２ バルブ ３ バルブ ４ バルブ ５ バルブ ６ バルブ ７ バルブ ８ バルブ ９ バルブ １０ バルブ １１ バルブ １２ バルブ １５ 管路 １７ 流量コントローラ １９ ２進数変換器 ２０ 開度量変換器 ３１ デジタルバルブ ３２ デジタルバルブ 1 valve 2 valve 3 valve 4 valve 5 valve 6 valve 7 valve 8 valve 9 valve 10 valve 11 valve 12 valve 15 conduit 17 flow controller 19 binary converter 20 opening degree converter 31 digital valve 32 digital valve
───────────────────────────────────────────────────── フロントページの続き (72)発明者 池田 元一 神奈川県逗子市久木２−６，Ｂ９ (72)発明者 岩佐 信弘 大阪府岸和田市葛城町910−55 (72)発明者 吉田 弘正 愛知県名古屋市西区押切一丁目９番６号 (72)発明者 小松 正 神奈川県川崎市川崎区田辺新田１番１号 富士電機株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoichi Ikeda 2-6, Hisagi, Zushi City, Kanagawa Prefecture (6) B9 (72) Nobuhiro Iwasa 910-55, Katsuragi Town, Kishiwada City, Osaka Prefecture (72) Hiromasa Yoshida Aichi Prefecture 1-9-6 Oshikiri, Nishi-ku, Nagoya (72) Inventor Tadashi Komatsu 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd.
Claims (2)
量の重みをつけた複数のバルブを並列に配設した並列管
路と、前記管路に設定流量が流れるように前記複数のバ
ルブの開閉の組合わせを制御する操作量の信号を出力す
る流量コントローラと、このコントローラからの操作量
の信号を前記複数のバルブの開閉の組合わせを行なう
開，閉信号に変換するデジタル変換器とを備える流量制
御装置において、大きな開度量を有するバルブの弁座流
路面積をこれより小さい開度量を有するバルブの弁座流
路面積の合計より小さくするとともに、流量コントロー
ラからの操作量の信号を、開にしたバルブの弁座流路面
積の合計に比例するように開度量の重みの合計である開
度量の信号に変換してデジタル変換器に入力させる開度
量変換器を備えたことを特徴とする流量制御装置。1. A parallel conduit in which a plurality of valves having different degrees of opening are provided in parallel, which are interposed in a conduit through which a fluid flows, and a plurality of the plurality of conduits for allowing a set flow rate to flow through the conduit. A flow rate controller that outputs a manipulated variable signal that controls the combination of valve opening and closing, and a digital converter that converts the signal of the manipulated variable from this controller into an open and closed signal that performs the combination of opening and closing the plurality of valves. And a valve seat flow passage area of a valve having a large opening amount smaller than the sum of valve seat flow passage areas of valves having a smaller opening amount, and a signal of an operation amount from a flow controller. Is provided with an opening amount converter that converts the signal into a signal of the opening amount that is the sum of the weights of the opening amounts so as to be proportional to the total area of the valve seat flow paths of the opened valve and inputs the signal to the digital converter. Flow control device according to claim.
なる開度量の重みをつけた複数のバルブは、異なる弁座
流路面積を有するバルブと、このうちのいずれの弁座流
路面積より大きく、かつ同一の弁座流路面積を有する数
個のバルブとから構成したことを特徴とする流量制御装
置。2. The flow control device according to claim 1, wherein the plurality of valves weighted with different opening amounts are valves having different valve seat flow passage areas and one of these valve seat flow passage areas. A flow control device comprising a plurality of valves which are large and have the same valve seat flow passage area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3345728A JP3001699B2 (en) | 1991-12-27 | 1991-12-27 | Flow control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3345728A JP3001699B2 (en) | 1991-12-27 | 1991-12-27 | Flow control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05181538A true JPH05181538A (en) | 1993-07-23 |
| JP3001699B2 JP3001699B2 (en) | 2000-01-24 |
Family
ID=18378569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3345728A Expired - Fee Related JP3001699B2 (en) | 1991-12-27 | 1991-12-27 | Flow control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3001699B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11104068A (en) * | 1997-09-30 | 1999-04-20 | Fuji Photo Optical Co Ltd | Flow rate control device for endoscope duct |
-
1991
- 1991-12-27 JP JP3345728A patent/JP3001699B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11104068A (en) * | 1997-09-30 | 1999-04-20 | Fuji Photo Optical Co Ltd | Flow rate control device for endoscope duct |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3001699B2 (en) | 2000-01-24 |
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