JPH0314010A - Mass flow controller - Google Patents

Mass flow controller

Info

Publication number
JPH0314010A
JPH0314010A JP15009589A JP15009589A JPH0314010A JP H0314010 A JPH0314010 A JP H0314010A JP 15009589 A JP15009589 A JP 15009589A JP 15009589 A JP15009589 A JP 15009589A JP H0314010 A JPH0314010 A JP H0314010A
Authority
JP
Japan
Prior art keywords
gas
mass flow
flow controller
flow rate
valve opening
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
JP15009589A
Other languages
Japanese (ja)
Inventor
Yoshiaki Tsuchiya
土屋 善昭
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP15009589A priority Critical patent/JPH0314010A/en
Publication of JPH0314010A publication Critical patent/JPH0314010A/en
Pending legal-status Critical Current

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  • Flow Control (AREA)

Abstract

PURPOSE:To suppress runaway of the gas flow rate to prevent the flow of gas of high flow rate when abnormality of the gas pressure or a trouble of a mass flow controller is generated by providing the mass flow controller with a pressure detector, a pressure transmitter, and a mechanism which limits the degree of opening of a valve by their signals. CONSTITUTION:A sensor (pressure detector) 11 which detects the flow rate, a valve opening degree limiting circuit 10 to which the output of this sensor is inputted through a pressure transmitter 9, and a valve opening degree limiter 5 which controls opening/closing of a control valve by the output of the valve opening degree limiting circuit 10 are provided on the gas entrance side. If the control valve 6 is opened up to its full width or the primary-side gas pressure is not proper at the time of trouble of the circuit, the flow of gas exceeding the control flow rate range of the mass flow controller is prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、工業用プロセスガスの流量制御器に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an industrial process gas flow rate controller.

〔従来の技術〕[Conventional technology]

第2図は従来の一例を示すマスフローコントローラのブ
ロック図である。
FIG. 2 is a block diagram of a conventional mass flow controller.

従来、この種のマスフローコントローラは、第2図に示
すように、センサー8、バイパス部13、コントロール
バルブ6、各種電気回路2゜3.4で構成されていた。
Conventionally, this type of mass flow controller has been comprised of a sensor 8, a bypass section 13, a control valve 6, and various electric circuits 2.3.4, as shown in FIG.

センサー8は、バイパス2管である毛細管に二つの自己
発熱抵抗体が巻かれ、ブリッジ回路2に接続されている
。ここで、バイパス管にガスが流れると、センサー8が
熱の移動に伴ない感知し、ブリッジ回路2のバランスが
くずれる。このバランスのくずれは、流体の質量と単位
時間当たりの流量に比例するものであるが、比較制御回
路4が、ブリッジ回路2の出力電圧を増幅回路3で増幅
した電圧と流量設定器から入力された電圧を比較し、コ
ントロールバルブの開度を制御することにより、マスフ
ローコントローラは、目的の流量を得ることができた。
The sensor 8 has two self-heating resistors wound around a capillary tube, which is two bypass tubes, and is connected to the bridge circuit 2. Here, when gas flows into the bypass pipe, the sensor 8 senses the movement of heat, causing the bridge circuit 2 to become unbalanced. This imbalance is proportional to the mass of the fluid and the flow rate per unit time, but the comparison control circuit 4 receives the output voltage of the bridge circuit 2, which is amplified by the amplifier circuit 3, and the voltage input from the flow rate setting device. By comparing the voltages and controlling the opening of the control valve, the mass flow controller was able to obtain the desired flow rate.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来のマスフローコントローラでは、通常、比
較制御回路4又は、ブリッジ回路2が故障した場合、コ
ントロールバルブ6が全開になることがあり、自燃性ガ
ス、毒性を持つガス等を使用する場合は、配管内に他の
安全装置を組み入れる必要があるので、ガスシステムの
規模が大きくなり、また構成が煩雑となる欠点を持って
いた。
In the above-mentioned conventional mass flow controller, if the comparison control circuit 4 or the bridge circuit 2 fails, the control valve 6 may become fully open. Since it is necessary to incorporate other safety devices into the piping, the scale of the gas system becomes large and the structure becomes complicated.

さらに、マスフローコントローラに流量制限として固定
オリフィスを取付けた場合でも、−次側ガス圧が適当で
なかった場合、マスフローコントローラの制御流量範囲
以上のガスが流れる危険があった。
Further, even when a fixed orifice is attached to the mass flow controller to restrict the flow rate, if the downstream side gas pressure is not appropriate, there is a risk that gas exceeding the control flow rate range of the mass flow controller will flow.

本発明の目的は、かかる問題を解消するマスフローコン
トローラを提供することにある。
An object of the present invention is to provide a mass flow controller that solves this problem.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のマスフローコントローラは、工業用プロセスガ
スの流量制御を行なうマスフローコントローラにおいて
、ガス入口側に設けられた流量を検出するセンサと、こ
のセンサより出力を圧力伝送器を介して入力するバルブ
開度制限回路と、このバルブ開度制限回路の出力により
コントロールバルブの開閉を制御するバルブ開度制限器
とを備え構成される。
The mass flow controller of the present invention is a mass flow controller that controls the flow rate of industrial process gas, and includes a sensor that detects the flow rate provided on the gas inlet side, and a valve opening that inputs the output from this sensor via a pressure transmitter. The valve opening limiter includes a limiting circuit and a valve opening limiter that controls opening and closing of the control valve based on the output of the valve opening limiting circuit.

〔実施例〕 次に、本発明について図面を参照して説明する。〔Example〕 Next, the present invention will be explained with reference to the drawings.

第1図は、本発明の一実施例を示すマスフローコントロ
ーラのブロック図である。このマスフローコントローラ
は、同図に示すように、許容量以上のガスが流出しない
ように、ガス人口1側に圧力検出器11を、この圧力検
出器11より流量を検出し、圧力伝送器9を介して作動
するバルブ開度制限回路10と、この制限回路10によ
り制御されるバルブ開度制限器5を設けたことである。
FIG. 1 is a block diagram of a mass flow controller showing one embodiment of the present invention. As shown in the figure, this mass flow controller has a pressure detector 11 on the gas population 1 side, detects the flow rate from this pressure detector 11, and connects a pressure transmitter 9 to prevent gas exceeding the permissible amount from flowing out. The valve opening limiter 5 is provided with a valve opening limiting circuit 10 that operates through the valve opening limiting circuit 10 and a valve opening limiting device 5 that is controlled by the limiting circuit 10.

その他は従来例と同じである。The rest is the same as the conventional example.

次に、このマスフローコントローラの動作を説明する。Next, the operation of this mass flow controller will be explained.

まず、マスフローコントローラ内部にガスが供給される
と、圧力検知器11によりガス圧が検知され、圧力伝送
器9を介し、バルブ開度制限回路10にガス圧に応じた
信号が入力される。
First, when gas is supplied into the mass flow controller, the pressure detector 11 detects the gas pressure, and a signal corresponding to the gas pressure is input to the valve opening limit circuit 10 via the pressure transmitter 9.

入力されたバルブ開度制限回路10は入力信号に応じて
出力信号をバルブ開度制限器5に出力し、比較制御回路
4からの出力と重畳し、コントロールバルブ6を制御す
る。
The input valve opening limit circuit 10 outputs an output signal to the valve opening limiter 5 in accordance with the input signal, and superimposes the output signal on the output from the comparison control circuit 4 to control the control valve 6.

通常、コントロールバルブが全開時のガス流量は、ガス
種とガス圧、マスフローコントローラの圧力損失によっ
て決定される0本実施例では、コントロールバルブ6の
開度の上限をガス圧によって変化させ、マスフローコン
トローラの故障時にも、マスフローコントローラから許
容量以上のガス流出を防止するものである。また、ガス
圧力がマスフローコントローラの最大使用圧よりも高く
なった場合、コントロールバルブを全閉とする機能を備
え、通常の使用時は、従来のマスフローコントローラと
同じ動作ができる。
Normally, the gas flow rate when the control valve is fully open is determined by the gas type, gas pressure, and pressure loss of the mass flow controller. In this embodiment, the upper limit of the opening degree of the control valve 6 is changed depending on the gas pressure, and This prevents more than the allowable amount of gas from flowing out from the mass flow controller even in the event of a failure. It also has a function to fully close the control valve when the gas pressure becomes higher than the maximum working pressure of the mass flow controller, and during normal use it can operate in the same way as a conventional mass flow controller.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、マスフローコントローラ
に圧力検知−器、圧力伝送器とその信号によりバルブ開
度を制限する機構を設けることにより、ガス圧の異常時
、マスフローコントローラの故障時にガス流量の暴走を
抑制し、大流量のガスが流れないようにすることができ
る。また、安全のなめにガスシステムに取付けられるニ
ードル弁、接点出力付圧力警報器などを組み込む必要が
ないため、ガスシステムの構成を簡素化することが可能
となり、ガスシステムをコンパクト化できる効果がある
As explained above, the present invention provides a mass flow controller with a pressure detector, a pressure transmitter, and a mechanism that limits the valve opening using their signals. It is possible to suppress runaway and prevent a large flow of gas from flowing. Additionally, since there is no need to incorporate needle valves or pressure alarms with contact outputs that are attached to the gas system for safety reasons, it is possible to simplify the configuration of the gas system, which has the effect of making the gas system more compact. .

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

第1図は本発明な一実施例を示すマスフローコントロー
ラの1のブロック図、第2図は、従来の一例を示すマス
フローコントローラのブロック図である。 1・・・ガス入口、2・・・ブリッジ回路、3・・・増
幅回路、4・・・比較制御回路、5・・・バルブ開度制
限器、6・・・コントロールバルブ、7・・・ガス出口
、8・・・センサー 9・・・圧力伝送器、10・・・
バルブ開度制限回路、11・・・力検知器、12・・・
流量設定器、13・・・バイパス部。
FIG. 1 is a block diagram of a mass flow controller showing an embodiment of the present invention, and FIG. 2 is a block diagram of a mass flow controller showing an example of a conventional mass flow controller. DESCRIPTION OF SYMBOLS 1... Gas inlet, 2... Bridge circuit, 3... Amplification circuit, 4... Comparison control circuit, 5... Valve opening limiter, 6... Control valve, 7... Gas outlet, 8...sensor 9...pressure transmitter, 10...
Valve opening limit circuit, 11...force detector, 12...
Flow rate setting device, 13... bypass section.

Claims (1)

【特許請求の範囲】[Claims] 工業用プロセスガスの流量制御を行なうマスフローコン
トローラにおいて、ガス入口側に設けられた流量を検出
するセンサと、このセンサより出力を圧力伝送器を介し
て入力するバルブ開度制限回路と、このバルブ開度制限
回路の出力によりコントロールバルブの開閉を制御する
バルブ開度制限器とを備えることを特徴とするマスフロ
ーコントローラ。
A mass flow controller that controls the flow rate of industrial process gas includes a sensor installed on the gas inlet side that detects the flow rate, a valve opening limit circuit that inputs the output from this sensor via a pressure transmitter, and a valve opening limit circuit that inputs the output from this sensor via a pressure transmitter. 1. A mass flow controller comprising: a valve opening limiter that controls opening and closing of a control valve based on the output of a degree limiting circuit.
JP15009589A 1989-06-12 1989-06-12 Mass flow controller Pending JPH0314010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15009589A JPH0314010A (en) 1989-06-12 1989-06-12 Mass flow controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15009589A JPH0314010A (en) 1989-06-12 1989-06-12 Mass flow controller

Publications (1)

Publication Number Publication Date
JPH0314010A true JPH0314010A (en) 1991-01-22

Family

ID=15489405

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15009589A Pending JPH0314010A (en) 1989-06-12 1989-06-12 Mass flow controller

Country Status (1)

Country Link
JP (1) JPH0314010A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005076095A1 (en) * 2004-02-03 2005-08-18 Hitachi Metals, Ltd. Mass flow control device
CN104615157A (en) * 2009-10-15 2015-05-13 关键系统公司 Method and apparatus for gas flow control
KR20160138238A (en) 2014-03-31 2016-12-02 도쿄 세이미츠 하츠조 가부시키가이샤 Bending device for metallic plate
US10207304B2 (en) 2014-03-31 2019-02-19 Tokyo Seimitsu Hatsujo Co., Ltd. Bending device for metallic plate

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005076095A1 (en) * 2004-02-03 2005-08-18 Hitachi Metals, Ltd. Mass flow control device
KR100739520B1 (en) * 2004-02-03 2007-07-13 히타치 긴조쿠 가부시키가이샤 Mass flow control device
US8112182B2 (en) 2004-02-03 2012-02-07 Hitachi Metals, Ltd. Mass flow rate-controlling apparatus
CN104615157A (en) * 2009-10-15 2015-05-13 关键系统公司 Method and apparatus for gas flow control
US9523435B2 (en) 2009-10-15 2016-12-20 Pivotal Systems Corporation Method and apparatus for gas flow control
US9904297B2 (en) 2009-10-15 2018-02-27 Pivotal Systems Corporation Method and apparatus for gas flow control
US9983595B2 (en) 2009-10-15 2018-05-29 Pivotal Systems Corporation Method and apparatus for gas flow control
KR20160138238A (en) 2014-03-31 2016-12-02 도쿄 세이미츠 하츠조 가부시키가이샤 Bending device for metallic plate
US10207304B2 (en) 2014-03-31 2019-02-19 Tokyo Seimitsu Hatsujo Co., Ltd. Bending device for metallic plate

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