JPH0777285A - Retraction valve - Google Patents

Retraction valve

Info

Publication number
JPH0777285A
JPH0777285A JP24866593A JP24866593A JPH0777285A JP H0777285 A JPH0777285 A JP H0777285A JP 24866593 A JP24866593 A JP 24866593A JP 24866593 A JP24866593 A JP 24866593A JP H0777285 A JPH0777285 A JP H0777285A
Authority
JP
Japan
Prior art keywords
diaphragm
output shaft
stepping motor
flow chamber
volume
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
JP24866593A
Other languages
Japanese (ja)
Inventor
Akihiro Kojima
章裕 小島
Kiyomi Sonobe
清実 薗部
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.)
CKD Corp
Iwaki Co Ltd
Original Assignee
CKD Corp
Iwaki Co 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 CKD Corp, Iwaki Co Ltd filed Critical CKD Corp
Priority to JP24866593A priority Critical patent/JPH0777285A/en
Publication of JPH0777285A publication Critical patent/JPH0777285A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To provide a retraction valve which is directly controlled on the basis of an electric signal. CONSTITUTION:When a pulse signal is inputted to a stepping motor 5, an output shaft 16 is precisely rotated in the normal/reverse direction according to the signal. As the output shaft 16 is screwed up with a nut 24 fixed in the stepping motor 5, the output shaft 16 advances/retracts according to the rotation. In this way, a diaphragm 7 is actuated via an actuator 8, and the volume of a flow chamber 6 is varied. Therefore, the diaphragm 7 is advanced so as to reduce the volume of the flow chamber 6 during the flow of liquid, while the diaphragm 7 is retracted according to a stop of discharge from a nozzle B so as to increase the volume of the flow chamber 6, and consequently, the retraction occurs in the tip of the nozzle B. In this way, advance/retraction of the diaphragm 7 is carried out by directly driving the stepping motor 5 on the basis of the electric signal, so that precise control with high responsiveness is carried out.

Description

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

【0001】[0001]

【産業上の利用分野】空気に触れると変質しやすい液体
を下向きに開口したノズルから正確に一定量ずつ吐出す
る場合に、液体の吐出停止後に液体をそのままにしてお
くと、ノズルの先端に溜まった液体が空気に触れて変質
するため、一定量だけノズルの中へ吸い戻す必要があ
り、また、吸い戻し速度も適正でないとノズルの内壁を
伝って液体が垂れ落ちてノズルの先端にたまるおそれが
ある。
[Industrial application] When a liquid that is susceptible to deterioration when exposed to air is accurately discharged from a nozzle that opens downward by a fixed amount, if the liquid is left as it is after it has stopped discharging, it will collect at the tip of the nozzle. Since the liquid touches the air and deteriorates, it is necessary to suck back a certain amount into the nozzle.If the sucking back speed is not appropriate, the liquid may drop along the inner wall of the nozzle and accumulate at the tip of the nozzle. There is.

【0002】本発明は被吐出液体が下向きに開口したノ
ズルから吐出される場合において、被吐出液体の吐出を
停止したときに被吐出液体をノズル内に所望量だけ所望
の速度で吸引するようにした吸い戻し弁に関する。
According to the present invention, when the liquid to be ejected is ejected from a nozzle having a downward opening, when the ejection of the liquid to be ejected is stopped, the liquid to be ejected is sucked into the nozzle by a desired amount at a desired speed. Regarding the suck back valve.

【0003】[0003]

【従来の技術】このような吸い戻し弁は、液体が流通す
る流通室の一面を画成するダイヤフラムの後退により流
通室の容積を拡大して吸い戻しを行うようになっている
が、従来のものは、電気信号を電空比例弁に入力して空
気圧に変換し、その空気圧によりダイヤフラムを作動さ
せるようになっていたため、空気の圧縮性などにより応
答性が低く、制御の精度も不十分であるという欠点があ
った。
2. Description of the Related Art In such a suck-back valve, the volume of the circulation chamber is expanded by the retraction of a diaphragm defining one surface of the circulation chamber in which the liquid flows, so as to suck back the liquid. In this case, the electric signal was input to the electropneumatic proportional valve to be converted into air pressure, and the diaphragm was operated by that air pressure, so the responsiveness was low due to the compressibility of air, and the control accuracy was insufficient. There was a drawback.

【0004】[0004]

【発明が解決しようとする課題】本発明が解決しようと
する課題は、電気信号により直接制御するようにした吸
い戻し弁を提供することである。
SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a suck-back valve which is directly controlled by an electric signal.

【0005】[0005]

【課題を解決するための手段】本発明は上記課題を解決
するための手段として、液体が流通する流通室の一面を
画成するダイヤフラムと、そのダイヤフラムを流通室の
容積が増大する方向へ付勢する作動体と、その作動体を
前記付勢に抗する方向へ押圧する出力軸が軸方向へ摺動
自由になっているステッピグモータと、そのステッピグ
モータに固定されて出力軸に形成された雄ねじに螺合す
るナットとからなる構成とした。
Means for Solving the Problems As a means for solving the above problems, the present invention provides a diaphragm that defines one side of a flow chamber in which a liquid flows, and a diaphragm that is attached in a direction in which the volume of the flow chamber increases. A stepping motor having a biasing actuating body and an output shaft that pushes the actuating body in a direction against the biasing force is slidable in the axial direction, and is formed on the output shaft by being fixed to the stepping motor. It is configured to include a nut that is screwed into the male screw.

【0006】[0006]

【発明の作用及び効果】本発明は上記構成になり、ステ
ッピングモーターにパルス信号が入力されるとその信号
に応じて出力軸が正逆方向に正確に回転する。出力軸は
ステッピングモーターに固定されたナットに螺合してい
るから回転にともなって、前進後退する。これにより、
作動体を介してダイヤフラムが作動し、流通室の容積が
変動する。
The present invention has the above-mentioned structure, and when a pulse signal is input to the stepping motor, the output shaft rotates accurately in the forward and reverse directions according to the signal. Since the output shaft is screwed into a nut fixed to the stepping motor, it moves forward and backward as it rotates. This allows
The diaphragm operates via the actuating body, and the volume of the flow chamber changes.

【0007】したがって、液体の流通時はダイヤフラム
を前進させて流通室の容積を小さくしておき、ノズルか
らの吐出が停止するのに応じて、ダイヤフラムを後退さ
せることにより流通室の容積を増大させてノズル先端で
吸い戻しを生じさせる。ここで、ダイヤフラムの前進後
退は電気信号によりステッピングモーターを直接駆動す
ることにより行われるから、応答性が高く、精密な制御
が行われる効果がある。
Therefore, during the flow of the liquid, the diaphragm is advanced to reduce the volume of the flow chamber, and when the discharge from the nozzle is stopped, the diaphragm is retracted to increase the volume of the flow chamber. Causes suction back at the nozzle tip. Here, since the diaphragm is moved forward and backward by directly driving the stepping motor by an electric signal, there is an effect that the response is high and precise control is performed.

【0008】[0008]

【実施例】以下、本発明の一実施例を図面に基づいて説
明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

【0009】図において、Aは被吐出液体の開閉弁、B
は被吐出液体を下向きに吐出するノズルであって、Cは
その間に介設された本発明にかかる吸い戻し弁である。
In the figure, A is an on-off valve for the liquid to be ejected, and B is
Is a nozzle for ejecting the liquid to be ejected downward, and C is a suction valve according to the present invention interposed therebetween.

【0010】吸い戻し弁Cは被吐出液体の開閉弁Aとノ
ズルBを結ぶ流通路2を透設した下部本体1とこれに嵌
合した上部本体3と支持台4を介して取り付けられたス
テッピングモーター5からなる。
The suction return valve C is a stepping body mounted through a lower body 1 having a flow passage 2 connecting the opening / closing valve A for the liquid to be discharged and the nozzle B, an upper body 3 fitted to the lower body 1 and a support 4. It consists of a motor 5.

【0011】下部本体1には流通路2と連なる流通室6
が形成されており、その上面がダイヤフラム7によって
覆われていて、そのダイヤフラム7の周縁は下部本体1
と上部本体3の間に挟着されており、中心部は作動体8
の下面に螺着されている。
The lower body 1 has a flow chamber 6 connected to the flow passage 2.
Is formed, the upper surface of which is covered by the diaphragm 7, and the peripheral edge of the diaphragm 7 is the lower body 1.
It is sandwiched between the upper body 3 and the upper body 3, and the central portion is the actuation body 8
Is screwed to the lower surface of the.

【0012】上部本体3に形成された中心孔9には作動
体8の小径部10が緊密かつ摺動自由に嵌合していると
ともに、小径部10の上部に形成された横孔11にピン
12が差し込まれ、その一端が横孔11から突出して上
部本体3に形成された溝13に嵌合して作動体8の回転
を不能にしており、作動体8はコイルばね14の弾拡力
により押し上げられてステッピングモーター5の出力軸
16に当接している。上部本体3には作動体8の上下動
を自由にするための通気孔15が形成されている。
A small-diameter portion 10 of the actuating body 8 is tightly and slidably fitted in a central hole 9 formed in the upper main body 3, and a pin is formed in a lateral hole 11 formed in the upper portion of the small-diameter portion 10. 12 is inserted, one end of which protrudes from the lateral hole 11 and is fitted into the groove 13 formed in the upper body 3 to disable the rotation of the operating body 8. The operating body 8 expands the elastic force of the coil spring 14. Is pushed up by and is in contact with the output shaft 16 of the stepping motor 5. The upper main body 3 is formed with a vent hole 15 for allowing the actuator 8 to move up and down freely.

【0013】ステッピングモーター5は基板17上にコ
イル18が配置され、その中に永久磁石21の中心に合
成樹脂製の心体20を充填したローター19が回転自由
に配置されている。心体20の中心孔22は上端部のみ
が欠円形をなし、これに嵌合する出力軸16も上半分が
欠円形をなしているとともに、基板17の中心にナット
24が固定されていて、出力軸16の下方部に形成され
た雄ねじ23がナット24に螺合しており、ローター1
9の回転により出力軸16が回転すると、出力軸16は
ナット24との螺合により回転方向に従って上方または
下方へ移動する。 Dは吸い戻し制御装置であって、開
閉弁Aが閉じた後、どの程度の量をどれくらいの速度で
吸い戻すのかを制御するようになっている。
In the stepping motor 5, a coil 18 is arranged on a substrate 17, and a rotor 19 having a synthetic resin core body 20 filled in the center of a permanent magnet 21 is rotatably arranged therein. The center hole 22 of the core body 20 has a truncated circular shape only at the upper end thereof, and the output shaft 16 fitted to this also has a truncated circular upper half, and the nut 24 is fixed to the center of the board 17, A male screw 23 formed on the lower portion of the output shaft 16 is screwed into a nut 24, and the rotor 1
When the output shaft 16 rotates by the rotation of 9, the output shaft 16 moves upward or downward according to the rotation direction by being screwed with the nut 24. Reference numeral D denotes a suck-back control device which controls how much and how fast the valve is sucked back after the on-off valve A is closed.

【0014】Eはパルス発信装置であって、吸い戻し制
御装置Dからの指令によりパルス信号をパルスモーター
5に入力するようになつている。
E is a pulse transmission device, which is adapted to input a pulse signal to the pulse motor 5 in response to a command from the suck-back control device D.

【0015】次に、本実施例の作動を説明する。Next, the operation of this embodiment will be described.

【0016】開閉弁Aが開いて被吐出液体がノズルBか
ら吐出している間は、吸い戻し制御装置Dからの指令に
よりパルス発信装置Eからプラスのパルス信号が発せら
れてパルスモーター5のローター19が正転し、ナット
24との螺合により出力軸16が下動して作動体8を押
し下げ、ダイヤフラム7が押し下げられて流通室6の容
積が減少している。
While the on-off valve A is opened and the liquid to be ejected is ejected from the nozzle B, a positive pulse signal is issued from the pulse transmission device E in response to a command from the suck-back control device D and the rotor of the pulse motor 5 is rotated. 19, the output shaft 16 is moved downward by screwing with the nut 24, and the operating body 8 is pushed down, the diaphragm 7 is pushed down, and the volume of the flow chamber 6 is reduced.

【0017】ここで、開閉弁Aが閉じると、吸い戻し制
御装置Dが作動してパルス発信装置Eからマイナスのパ
ルス信号が発せられ、パルスモーター5のローター19
が逆転する。すると、出力軸16はナット24との螺合
により上動し、コイルばね14の弾力により作動体8が
押し上げられてこれに螺着されたダイヤフラム7が引き
上げられることにより流通室6の容積が増大し、ノズル
B内の被吐出液体が吸い戻される。
Here, when the on-off valve A is closed, the suck-back control device D is actuated and a negative pulse signal is issued from the pulse transmission device E, so that the rotor 19 of the pulse motor 5 is rotated.
Is reversed. Then, the output shaft 16 is moved upward by screwing with the nut 24, the actuating body 8 is pushed up by the elastic force of the coil spring 14, and the diaphragm 7 screwed to this is pulled up, whereby the volume of the flow chamber 6 increases. Then, the liquid to be ejected in the nozzle B is sucked back.

【0018】本実施例においては、被吐出液体の吸い戻
しをパルスモーター5でダイヤフラム7を駆動すること
により行うようにしたから、吸い戻し量を任意に定める
ことができるのはもちろん、吸い始めは急速に吸い、そ
の後はゆっくりと吸うというように、吸い戻し速度を任
意に制御することができて、最適の条件で吸い戻しを行
うことができる。
In the present embodiment, the sucked back liquid is sucked back by driving the diaphragm 7 by the pulse motor 5, so that the sucked back amount can be arbitrarily set and the sucking start can be controlled at the beginning. The suck-back speed can be arbitrarily controlled so that the suck-back is performed rapidly, and then slowly, so that the suck-back can be performed under optimum conditions.

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

【図1】本考案の一実施例の断面図である。FIG. 1 is a sectional view of an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

2:流通路 5:ステッピングモーター 6:流通室 7:ダイヤフラム 8:作動体 14:コイルばね 16:出力軸 19:ローター 23:雄ねじ 24:ナット A:開閉弁 B:ノズル 2: Flow path 5: Stepping motor 6: Flow chamber 7: Diaphragm 8: Actuator 14: Coil spring 16: Output shaft 19: Rotor 23: Male screw 24: Nut A: Open / close valve B: Nozzle

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 液体が流通する流通室の一面を画成する
ダイヤフラムと、該ダイヤフラムを前記流通室の容積が
増大する方向へ付勢する作動体と、該作動体を前記付勢
に抗する方向へ押圧する出力軸が軸方向へ摺動自由にな
っているステッピグモータと、該ステッピグモータに固
定されて前記出力軸に形成された雄ねじに螺合するナッ
トとからなることを特徴とする吸い戻し弁。
1. A diaphragm that defines one surface of a flow chamber in which liquid flows, an actuating member that biases the diaphragm in a direction in which the volume of the flow chamber increases, and a resisting force of the actuating member. A stepping motor having an output shaft that is pressed in the axial direction slidable in the axial direction, and a nut that is fixed to the stepping motor and that is screwed into a male screw formed on the output shaft. Suck back valve.
JP24866593A 1993-09-08 1993-09-08 Retraction valve Pending JPH0777285A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24866593A JPH0777285A (en) 1993-09-08 1993-09-08 Retraction valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24866593A JPH0777285A (en) 1993-09-08 1993-09-08 Retraction valve

Publications (1)

Publication Number Publication Date
JPH0777285A true JPH0777285A (en) 1995-03-20

Family

ID=17181524

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24866593A Pending JPH0777285A (en) 1993-09-08 1993-09-08 Retraction valve

Country Status (1)

Country Link
JP (1) JPH0777285A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7637440B2 (en) 2004-06-29 2009-12-29 Smc Kabushiki Kaisha Suck back valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153230A (en) * 1976-06-14 1977-12-20 Kyoto Seisakusho Valve
JPH04316775A (en) * 1991-04-12 1992-11-09 Ckd Corp Retraction device for nozzle
JPH05126272A (en) * 1991-11-06 1993-05-21 Sekisui Chem Co Ltd Electrically-driven actuator for valve
JPH05180363A (en) * 1991-12-26 1993-07-20 Toto Ltd Flow control valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52153230A (en) * 1976-06-14 1977-12-20 Kyoto Seisakusho Valve
JPH04316775A (en) * 1991-04-12 1992-11-09 Ckd Corp Retraction device for nozzle
JPH05126272A (en) * 1991-11-06 1993-05-21 Sekisui Chem Co Ltd Electrically-driven actuator for valve
JPH05180363A (en) * 1991-12-26 1993-07-20 Toto Ltd Flow control valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7637440B2 (en) 2004-06-29 2009-12-29 Smc Kabushiki Kaisha Suck back valve

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