JP2898906B2 - Electric flow control valve - Google Patents
Electric flow control valveInfo
- Publication number
- JP2898906B2 JP2898906B2 JP7163162A JP16316295A JP2898906B2 JP 2898906 B2 JP2898906 B2 JP 2898906B2 JP 7163162 A JP7163162 A JP 7163162A JP 16316295 A JP16316295 A JP 16316295A JP 2898906 B2 JP2898906 B2 JP 2898906B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- diameter
- valve body
- small
- seat
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Electrically Driven Valve-Operating Means (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は冷凍サイクルに用いられ
る冷媒のような流体の流量制御に使用する電動流量制御
弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric flow control valve used for controlling a flow rate of a fluid such as a refrigerant used in a refrigeration cycle.
【0002】[0002]
【従来の技術】この種電動流量制御弁としては、本出願
人が提案した実公平3−51574号公報に開示されて
いる構成がある。開示された電動流量制御弁を図3によ
り説明する。電動流量制御弁は弁室4を有する弁筐3に
第1流路1が接続される流体流入口1aと第2流路2が
前記流入口1aと直交位置で接続される流体流出口1b
を開設し該流体流出口1bの弁筐弁室4と連通する大径
弁口5に大径弁座6を設けた弁本体Aと、この弁本体A
の流体流出口1bと反対側になる弁筐外側部に固定され
る非磁性板で形成された中空筒状のキャン7及び該キャ
ン7の外側に配置されるステータコイル8を有し前記キ
ャン7の内側にステータコイル8の通電励磁によって回
動されるロータ9を設けたパルス制御可能なステッピン
グモータBと、前記弁本体Aの大径弁座6に接離し該弁
口5を開閉する弁体10を有し該弁体10を弁筐弁室4
内において前記ステッピングモータBのロータ回転によ
るネジ送り作用で弁開閉方向に移動させる弁開閉機構C
とを具備する。2. Description of the Related Art An electric flow control valve of this type is disclosed in the present application.
Disclosed in Japanese Utility Model Publication No. 3-51574 proposed by
There are some configurations. The disclosed electric flow control valve is shown in FIG.
Will be described. The motor-operated flow control valve includes a fluid inlet 1a where the first flow path 1 is connected to the valve housing 3 having the valve chamber 4 and a fluid outlet 1b where the second flow path 2 is connected at a position orthogonal to the inlet 1a.
A valve body A provided with a large-diameter valve seat 6 at a large-diameter valve port 5 communicating with the valve housing valve chamber 4 at the fluid outlet 1b;
A hollow cylindrical can 7 formed of a non-magnetic plate fixed to the outer side of the valve housing opposite to the fluid outlet 1b of the above, and a stator coil 8 disposed outside the can 7 A stepping motor B which is provided with a rotor 9 which is rotated by energization of a stator coil 8 inside thereof and which can be controlled by a pulse, and a valve body which comes into contact with and separates from the large-diameter valve seat 6 of the valve body A to open and close the valve port 5 10 and the valve body 10
Valve opening / closing mechanism C that moves in the valve opening / closing direction by a screw feed action by the rotation of the rotor of the stepping motor B
And
【0003】前記弁開閉機構Cは、ロータ9の内周雌ネ
ジ部に螺合される雄ネジ部を有し前記弁本体Aの弁筐突
出口3aに螺合固着(螺合ネジ部をカシメで固着)され
る管状の固定ガイド11と、この固定ガイド11内に挿
入され上端軸部12aをロータ上部の中心孔に挿入して
C形リングのような係止具13でロータ9と一体に移動
するように係止される弁棒12と、この弁棒上端軸部1
2aの根元段部とロータ上部ワッシャ14との間に介装
され前記弁棒12を閉弁方向(図3において下方向)に
付勢する閉弁緩衝ばね15とを具備し、前記ロータ9が
固定ガイド11のネジ送り作用で回転しながら軸心方向
に移動し、このロータ9の回転移動によって前記弁棒1
2を弁開閉方向に移動させることにより、この弁棒下端
の弁体10(大径弁座6に接離する大径弁体)を開閉作
動させて流体の流量を制御するようになっている。The valve opening / closing mechanism C has a male screw portion which is screwed to an inner female screw portion of the rotor 9 and is screwed and fixed to the valve housing projecting opening 3a of the valve body A (with the screw screw portion being caulked). A fixed guide 11 which is inserted into the fixed guide 11, and an upper end shaft portion 12a inserted into the fixed guide 11 is inserted into a center hole of an upper portion of the rotor, and is integrally formed with the rotor 9 by a locking member 13 such as a C-shaped ring. A valve stem 12 which is locked so as to move;
A valve-closing cushioning spring 15 interposed between the root step of 2a and the upper washer 14 for urging the valve rod 12 in a valve-closing direction (downward in FIG. 3); The shaft 9 moves in the axial direction while rotating by the screw feed action of the fixed guide 11, and the rotation of the rotor 9 causes the valve stem 1 to rotate.
By moving the valve 2 in the valve opening / closing direction, the valve body 10 at the lower end of the valve rod (large-diameter valve body that comes into contact with and separates from the large-diameter valve seat 6) is opened and closed to control the flow rate of the fluid. .
【0004】なお、図中16は前記ロータ9の下端部に
突出量の調整ができるように螺装され、前記弁体10の
閉弁時にキャン下側ストッパ17に図示の如く当接して
前記ロータ9の閉弁下降限を規制する閉弁規制杆を示
し、また図中18は前記ロータ9の上端部に突出量の調
整ができるように螺装され、前記弁体10の全開時(弁
体10の上面部が弁筐弁室4の上面部に当たる直前)に
キャン上側ストッパ19に当接して前記ロータ9の開弁
上昇限を規制する開弁規制杆を示す。[0004] In the figure, reference numeral 16 is screwed into the lower end of the rotor 9 so that the amount of protrusion can be adjusted. Reference numeral 18 denotes a valve closing restricting rod for restricting a valve closing lower limit of the valve closing member 9. In the figure, reference numeral 18 is screwed onto the upper end of the rotor 9 so that the amount of protrusion can be adjusted. A valve-opening restricting rod that contacts the can upper stopper 19 and regulates the valve-opening limit of the rotor 9 just before the upper surface of the valve 10 contacts the upper surface of the valve housing 4 is shown.
【0005】而して、前記のように構成された電動流量
制御弁は、前記ステータコイル8に与えられるパルスに
よって図2に示すような2段階の流体流量制御特性が得
られるように作動されるもので、この流体の流量制御特
性は例えば図2に示す如く、0〜250パルス間で低流
量域(図中L部)を制御し、250〜500パルス間で
大流量域(図中H部)を制御する2段階の特性となって
いる。この他、特開昭61−290281号公報には、
ガスの流路を開閉する2段弁が開示されている。The motor-operated flow control valve constructed as described above is operated so that a two-stage fluid flow control characteristic as shown in FIG. 2 is obtained by the pulse applied to the stator coil 8. For example, as shown in FIG. 2, the flow rate control characteristic of this fluid controls a low flow rate region (part L in the figure) between 0 and 250 pulses, and a large flow rate range (part H in the figure) between 250 and 500 pulses. ) Is controlled in two stages. In addition, JP-A-61-290281 discloses that
A two-stage valve that opens and closes a gas flow path is disclosed .
【0006】[0006]
【発明が解決しようとする課題】然し乍ら、一個の弁体
10と弁座6により図2の如き流量制御特性を満足させ
るためには、前記弁口5の口径を最大流量(500パル
スの時の流量)に合わせて大きくする必要(大径弁口と
する必要)がある。従って、図2における大流量域(図
中H部)の制御は精密に行い得るが、図2における低流
量域(図中L部)は弁体10のストロークの僅かな変動
によって、流量が大幅に変化してしまうために、低流量
域(L部)の流量制御にバラツキが生じ、精密な流量制
御が行えないという欠点があった。However, in order to satisfy the flow control characteristic as shown in FIG. 2 by one valve body 10 and valve seat 6, the diameter of the valve port 5 must be increased to the maximum flow rate (at the time of 500 pulses). It is necessary to increase the flow rate (flow rate) (a large-diameter valve port is required). Therefore, the control of the large flow rate area (H section in the figure) in FIG. 2 can be performed precisely, but the flow rate in the low flow rate area (L section in the figure) of FIG. Therefore, the flow rate control in the low flow rate range (L section) varies, and there is a disadvantage that precise flow rate control cannot be performed.
【0007】また前記従来の流量制御弁は、その開弁時
に流体圧力が前記弁体10を弁座6に押付ける方向に作
用するので、即ち前記弁体10に(弁体前後の圧力差
P)×(弁体口径D2×π/4)の荷重が作用するの
で、前記弁体10を開弁させるのに大きなトルクが必要
となることから、ステータコイル8の巻線仕様を増加さ
せたり、ロータマグネットの磁束密度を増加させたりす
る等の対策が必要となり、弁全体が大型化し高価なもの
になってしまうという問題があった。Further, in the conventional flow control valve, when the valve is opened, the fluid pressure acts in a direction of pressing the valve body 10 against the valve seat 6, that is, the valve body 10 has a pressure difference P (front and rear pressure difference P). ) × (valve body diameter D 2 × π / 4) is applied, so that a large torque is required to open the valve body 10, so that the winding specification of the stator coil 8 can be increased. Therefore, it is necessary to take measures such as increasing the magnetic flux density of the rotor magnet, and there is a problem that the entire valve becomes large and expensive.
【0008】この発明は前記従来の問題を解消するため
に案出されたもので、その目的は低流量域から大流量域
まで精密な流量制御を行うことができ、また流体圧力に
対する開弁に必要なトルクが小さくて良く弁全体の小型
化を図ることができる電動流量制御弁を提供することに
ある。The present invention has been devised to solve the above-mentioned conventional problems, and has an object to perform precise flow control from a low flow rate range to a large flow rate range, and to open a valve for a fluid pressure. An object of the present invention is to provide an electric flow control valve which requires a small torque and can reduce the size of the entire valve.
【0009】[0009]
【課題を解決するための手段】前記の目的を達成するた
めに、本発明の電動流量制御弁は、提案した弁体10に
代えて、弁筐弁室内に摺動自在に支持されて大径弁座に
対して離接する大径の第2の弁体22と、大径の第2の
弁体の内部に形成される第1の弁室内に摺動自在に支持
されて大径の第2の弁体に設けられる小径弁座に対して
離接して小径弁口を開閉する小径の第1弁体21とを有
するとともに、弁本体Aは小径の第1の弁体が所定の距
離だけ小径弁座から離れたときに当接する第1の弁体に
設けた鍔状突起20と、第2の弁体に設けた係合手段3
0と、第2の弁体を常時大径弁座に向けて付勢するスプ
リング31を備える構成となっている。そして、弁開閉
機構が作動されたとき、小径の第1の弁体が小径弁座か
ら離れる方向に作動される際に、弁筐弁室と連通する第
1の弁室と小径弁口との間の流路を開いて小流量の流量
制御を行なう小流量制御域と、第1の弁体が第2の弁体
に係合した後に、第2の弁体がスプリングに抗して大径
弁座から離れる方向に作動されて弁筐弁室と大径弁口の
間の流路を開いて大流量の流量制御を行なう大流量制御
域の2段の流量制御域を形成する構成を具備する。In order to achieve the above object, the electric flow control valve of the present invention is slidably supported in a valve housing valve chamber instead of the proposed valve element 10 and has a large diameter. On the valve seat
A large-diameter second valve body 22 which is separated from and connected to the large-diameter second valve body 22;
Slidably supported in a first valve chamber formed inside the valve body
To the small-diameter valve seat provided on the large-diameter second valve body
A small-diameter first valve body 21 that opens and closes the small-diameter valve port by separating and connecting
At the same time, the valve body A has a small diameter first valve body with a predetermined distance.
The first valve body that comes into contact when separated from the small-diameter valve seat
The provided flange-shaped projection 20 and the engaging means 3 provided on the second valve body
0 and a spur for constantly urging the second valve body toward the large-diameter valve seat.
The configuration includes a ring 31. And valve opening and closing
When the mechanism is actuated, the small-diameter first valve element is a small-diameter valve seat.
When actuated away from the valve housing, a third
Open the flow path between the valve chamber of No. 1 and the small-diameter valve port to obtain a small flow rate
A small flow control area for controlling the first valve body and a second valve body;
After engagement with the second valve, the second valve body has a large diameter against the spring.
Operated in the direction away from the valve seat, the valve housing valve chamber and the large-diameter valve port
Large flow rate control that opens a flow path between the two to control large flow rates
And a structure for forming a two-stage flow control region of the region .
【0010】[0010]
【作用】前記構成の電動流量制御弁によれば、ステッピ
ングモータBの作動(ロータ回転によるネジ送り作用)
によって、先ず第1弁体21が第2弁体22の小径弁座
26から離れる方向に移動して、第2弁体22の小径弁
口27を開放する。According to the electric flow control valve having the above-mentioned structure, the operation of the stepping motor B (screw feed operation by rotation of the rotor).
As a result, first, the first valve element 21 moves away from the small-diameter valve seat 26 of the second valve element 22 to open the small-diameter valve port 27 of the second valve element 22.
【0011】この時、第2弁体22はスプリング31の
バネ力で弁本体Aの大径弁座6に押圧されて弁本体Aの
大径弁口5を閉塞しているので、第1流路1から弁筐弁
室4に流入された流体が第2弁体22の連通穴25→第
1弁室24→小径弁口27という経路を経て第2流路2
に流出される。この時の流量は小流量(低流量)であ
り、この低流量域の制御は小径な第1弁体21の小径弁
口27に対する開度(小径弁座26と第1弁体21の開
口面積)で決定され、第1弁体21の開弁ストロークの
僅かな変動に対しての流量変化を僅少にすることができ
るので、低流量域(図2のL部)のバラツキがない精密
な流量制御を行うことが可能となる。At this time, the second valve body 22 is pressed by the large diameter valve seat 6 of the valve body A by the spring force of the spring 31 and closes the large diameter valve port 5 of the valve body A. The fluid flowing from the passage 1 into the valve housing valve chamber 4 passes through the communication hole 25 of the second valve body 22 → the first valve chamber 24 → the small-diameter valve port 27 and passes through the second passage 2.
Spilled to. The flow rate at this time is a small flow rate (low flow rate), and the control of this low flow rate area is performed by opening the small diameter first valve body 21 with respect to the small diameter valve port 27 (the opening area of the small diameter valve seat 26 and the first valve body 21). ), The change in the flow rate with respect to a slight change in the valve opening stroke of the first valve body 21 can be made small, so that a precise flow rate without variation in the low flow rate region (L portion in FIG. 2) can be obtained. Control can be performed.
【0012】また、前記第1弁体21が前記のように開
弁されると、この第1弁体21の開弁移動によって第1
弁体21と第2弁体22が係合手段30で係合し、この
第1弁体21の動きに連動して第2弁体22が弁本体A
の大径弁座6から離れる方向に移動して弁本体Aの大径
弁口5を開放するので、第1流路1から弁筐弁室4に流
入された流体が弁本体Aの大径弁口5から第2流路2に
流出され、また前記流体(弁筐弁室4に流入された流
体)の一部は第2弁体22の連通穴25→第1弁室24
→小径弁口27という経路を経て第2流路2に流出され
る。When the first valve body 21 is opened as described above, the first valve body 21 is opened by the opening movement of the first valve body 21.
The valve body 21 and the second valve body 22 are engaged by the engagement means 30, and the second valve body 22 is moved to the valve body A in conjunction with the movement of the first valve body 21.
Moves in a direction away from the large-diameter valve seat 6 to open the large-diameter valve port 5 of the valve body A, so that the fluid flowing from the first flow path 1 into the valve housing valve chamber 4 is A part of the fluid (fluid flowing into the valve housing valve chamber 4) flows out of the valve port 5 into the second flow path 2 and is partially communicated with the communication hole 25 of the second valve body 22 → the first valve chamber 24.
→ It flows out to the second flow path 2 through the path of the small diameter valve port 27.
【0013】この時の流量は大流量であり、この大流量
域の制御は大径な第2弁体22の大径弁口6に対する開
度で決定されるので、大流量域(図2のH部)の精密な
流量制御を従来と同様に行うことができる。At this time, the flow rate is a large flow rate, and the control of this large flow rate area is determined by the degree of opening of the large-diameter second valve body 22 with respect to the large-diameter valve port 6. The precise flow rate control in section H) can be performed in the same manner as in the related art.
【0014】[0014]
【実施例】以下、本発明の一実施例を図1に従い具体的
に説明すると、この電動流量制御弁は従来のものと同様
な弁本体AとステッピングモータB及び弁開閉機構Cを
具備するが、この弁本体AとステッピングモータB及び
弁開閉機構Cの構成は従来のものと同様であるので、同
一部分に同符号を付して詳細な説明は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described in detail with reference to FIG. 1. This electric flow control valve comprises a valve body A, a stepping motor B and a valve opening / closing mechanism C similar to those of the prior art. Since the configurations of the valve body A, the stepping motor B and the valve opening / closing mechanism C are the same as those of the prior art, the same parts are denoted by the same reference numerals and detailed description is omitted.
【0015】而して、本発明においては、弁本体Aの弁
筐弁室4を図1のように縦長とし、図3に示す従来公知
の電動流量制御弁における弁体10に代えて、弁開閉機
構Cで直接作動される小径の第1弁体21と、この第1
弁体21の動きに連動し該第1弁体21の開弁後に時間
差をもって開弁される大径の第2弁体22とからなる二
段弁(複数弁)の構造としたものである。Thus, in the present invention, the valve housing 4 of the valve body A is made vertically long as shown in FIG. 1, and the valve body 10 in the conventionally known electric flow control valve shown in FIG. A small-diameter first valve body 21 directly operated by the opening / closing mechanism C;
A two-stage valve (a plurality of valves) having a large-diameter second valve body 22 that opens with a time lag after the first valve body 21 is opened in conjunction with the movement of the valve body 21.
【0016】前記第2弁体22は弁本体Aの大径弁座6
に接離する円錐状の弁座当接面23と、弁本体Aの弁筐
弁室4に連通穴25を介して連通する第1弁室24と、
この第1弁室24と第2流路2を連通する小径弁口27
と、この小径弁口27の弁室開口部に形成され前記第1
弁体21の先端円錐面が接離する小径弁座26と、前記
第1弁体21との係合手段30とを有し、前記弁座当接
面23が弁本体Aの大径弁座6に押付けられる方向に圧
縮スプリング31で付勢されている。The second valve body 22 is a large-diameter valve seat 6 of the valve body A.
A first valve chamber 24 communicating with the valve housing valve chamber 4 of the valve body A via a communication hole 25;
A small-diameter valve port 27 for communicating the first valve chamber 24 with the second flow path 2
And the first port formed at the valve chamber opening of the small-diameter valve port 27.
The valve body 21 includes a small-diameter valve seat 26 with which the conical surface of the tip comes in contact with and separates from the first valve body 21, and the valve seat contact surface 23 is a large-diameter valve seat of the valve body A. 6 is urged by a compression spring 31 in a direction in which the compression spring 31 is pressed.
【0017】なお、前記第2弁体22はスプリング付勢
の弁ホルダ28に図示の如く保持され、この弁ホルダ2
8の第1弁室24内へ突出する内周フランジ部29を第
1弁体21の上部突起20(鍔状突起)が係合可能な係
合手段30として形成し、前記第1弁体21の開弁時に
該弁体上部突起20が前記係合手段30(弁ホルダ28
のフランジ部29)に係合して、第2弁体22が引上げ
開弁される構成となっている。The second valve element 22 is held by a spring-energized valve holder 28 as shown in FIG.
8 is formed as an engagement means 30 with which the upper projection 20 (flange-shaped projection) of the first valve body 21 can be engaged, and the first valve body 21 has an inner peripheral flange portion 29 protruding into the first valve chamber 24. When the valve is opened, the valve body upper projection 20 is engaged with the engaging means 30 (the valve holder 28).
, The second valve element 22 is pulled up and opened.
【0018】而して、前記構成の電動流量制御弁は、ス
テッピングモータが作動すると、ロータ回転によるネジ
送り作用によって、先ず第1弁体21が第2弁体22の
小径弁座26から離れる方向に移動して第2弁体22の
小径弁口27を開放する。When the stepping motor is actuated, the motor-operated flow control valve having the above-described structure is arranged such that the first valve element 21 is separated from the small-diameter valve seat 26 of the second valve element 22 by the screw feed action of the rotation of the rotor. And the small-diameter valve port 27 of the second valve body 22 is opened.
【0019】この時、第2弁体22はスプリング31の
バネ力で弁本体Aの大径弁座6に押圧されて弁本体Aの
大径弁口5を閉塞しているので、第1流路1から弁筐弁
室4に流入された流体が第2弁体22の連通穴25→第
1弁室24→小径弁口27という経路を経て第2流路2
に流出される。この時の流量は小流量(低流量)であ
り、この低流量域の制御は小径な第1弁体21の小径弁
口27に対する開度(小径弁座26と第1弁体21の開
口面積)で決定され、第1弁体21の開弁ストロークの
僅かな変動に対しての流量変化を僅少にすることができ
るので、低流量域(図2のL部)のバラツキがない精密
な流量制御を行うことが可能となる。At this time, the second valve body 22 is pressed by the large-diameter valve seat 6 of the valve body A by the spring force of the spring 31 and closes the large-diameter valve port 5 of the valve body A. The fluid flowing from the passage 1 into the valve housing valve chamber 4 passes through the communication hole 25 of the second valve body 22 → the first valve chamber 24 → the small-diameter valve port 27 and passes through the second passage 2.
Spilled to. The flow rate at this time is a small flow rate (low flow rate), and the control of this low flow rate area is performed by opening the small diameter first valve body 21 with respect to the small diameter valve port 27 (the opening area of the small diameter valve seat 26 and the first valve body 21). ), The change in the flow rate with respect to a slight change in the valve opening stroke of the first valve body 21 can be made small, so that a precise flow rate without variation in the low flow rate region (L portion in FIG. 2) can be obtained. Control can be performed.
【0020】また、前記第1弁体21が前記のように開
弁されると、この第1弁体21の開弁移動によって第1
弁体21と第2弁体22が係合手段30で係合し、この
第1弁体21の動きに連動して第2弁体22が弁本体A
の大径弁座6から離れる方向に移動して弁本体Aの大径
弁口5を開放するので、第1流路1から弁筐弁室4に流
入された流体が弁本体Aの大径弁口5から第2流路2に
流出され、また前記流体(弁筐弁室4に流入された流
体)の一部は第2弁体22の連通穴25→第1弁室24
→小径弁口27という経路を経て第2流路2に流出され
る。When the first valve body 21 is opened as described above, the first valve body 21 is opened by the opening movement of the first valve body 21.
The valve body 21 and the second valve body 22 are engaged by the engagement means 30, and the second valve body 22 is moved to the valve body A in conjunction with the movement of the first valve body 21.
Moves in a direction away from the large-diameter valve seat 6 to open the large-diameter valve port 5 of the valve body A, so that the fluid flowing from the first flow path 1 into the valve housing valve chamber 4 is A part of the fluid (fluid flowing into the valve housing valve chamber 4) flows out of the valve port 5 into the second flow path 2 and is partially communicated with the communication hole 25 of the second valve body 22 → the first valve chamber 24.
→ It flows out to the second flow path 2 through the path of the small diameter valve port 27.
【0021】以上のように、弁部構成を小径な第1弁体
21と大径な第2弁体22による二段弁(複数弁)とす
ることで、低流量域(図2L部)から大流量域(図2H
部)まで精密な流量制御ができる。ここで、従来の一段
弁の場合と、本発明の二段弁の場合を比較してみる。As described above, by using a two-stage valve (a plurality of valves) composed of the small-diameter first valve body 21 and the large-diameter second valve body 22 as the valve portion, a low flow rate region (portion L in FIG. 2) can be obtained. Large flow area (Fig. 2H
Part), precise flow control is possible. Here, the case of the conventional one-stage valve and the case of the two-stage valve of the present invention will be compared.
【0022】弁の開口面積Sは弁体ストロークをLX、
弁体口径をD、弁体の円錐半角(弁座当接面の円錐半
角)をθとすると、 S=π・LX・sinθ(D−LX・sinθ・cosθ)The opening area S of the valve is such that the valve body stroke is L X ,
Assuming that the diameter of the valve body is D and the half cone angle of the valve body (half cone angle of the valve seat contact surface) is θ, S = π · L X · sin θ (D−L X · sin θ · cos θ)
【0023】図2のL部の流量を得るための弁開口面積
を0〜0.72mm2、同図H部の流量を得るための弁開
口面積を0.72mm2〜21mm2とすると、必要な弁の諸
元は 従来の一段弁の場合 D=5.0mm 本案の二段弁の場合 D=1.3mm(第1弁体) D=5.0mm(第2弁体)[0023] 0~0.72Mm 2 the valve opening area for obtaining the flow rate of the L portion of Figure 2, when the valve opening area for obtaining the flow rate of the drawing portion H and 0.72 mm 2 ~21Mm 2, need The specifications of the valve are as follows: For a conventional one-stage valve D = 5.0 mm For a two-stage valve of the present invention D = 1.3 mm (first valve body) D = 5.0 mm (second valve body)
【0024】前記L部の最大開口面積0.72mm2を2
50パルスの点で得るためには、 従来の一段弁の場合 θ=1.7度 本案の二段弁の場合 θ=7.7度[0024] The maximum open area 0.72 mm 2 of the L section 2
In order to obtain at the point of 50 pulses, in the case of the conventional one-stage valve θ = 1.7 degrees In the case of the two-stage valve of the present invention θ = 7.7 degrees
【0025】ここで、弁体口径Dと弁体の円錐半角θの
加工公差を考慮すると、 従来の一段弁の場合 S=0.72〜0.81mm2(弁開口面積公差幅=0.
09mm2) 本案の二段弁の場合 S=0.72〜0.75mm2(弁開口面積公差幅=0.
03mm2) 以上のように、前記弁開口面積公差幅から見て同じ加工
精度で比較すると、二段弁にした方(本発明)が一段面
(従来)に比べて3倍の精度が得られる。Here, considering the processing tolerance of the valve body diameter D and the half cone angle θ of the valve body, in the case of a conventional one-stage valve, S = 0.72 to 0.81 mm 2 (valve opening area tolerance width = 0.
09 mm 2 ) In the case of the two-stage valve of the present invention, S = 0.72 to 0.75 mm 2 (tolerance width of valve opening area = 0.
03 mm 2 ) As described above, when compared with the same processing accuracy in view of the valve opening area tolerance width, the two-stage valve (the present invention) can obtain three times the accuracy as compared with the one-stage surface (conventional). .
【0026】[0026]
【発明の効果】以上説明したように、本発明の電動流量
制御弁によれば、弁部構成を小径な第1弁体21と大径
な第2弁体22による二段弁(複数弁)とすることで、
低流量域(図2L部)から大流量域(図2H部)まで精
密な流量制御を行うことができる。また、第1弁体21
の弁口径が小さいことから、流体圧力に対する開弁に必
要なトルクが小さくて良いので、弁全体を小形化するこ
とができる等の優れた発明上の効果を奏する。As described above, according to the motor-operated flow control valve of the present invention, the valve section is a two-stage valve (a plurality of valves) composed of the small-diameter first valve body 21 and the large-diameter second valve body 22. By doing
Precise flow control can be performed from a low flow area (FIG. 2L) to a large flow area (FIG. 2H). Also, the first valve body 21
Since the valve diameter of the valve is small, the torque required for opening the valve with respect to the fluid pressure may be small, and the present invention has an excellent effect of the invention such as downsizing of the entire valve.
【図1】本発明の一実施例による電動流量制御弁の中央
縦断面図。FIG. 1 is a central longitudinal sectional view of an electric flow control valve according to an embodiment of the present invention.
【図2】前記制御弁による流体の流量制御特性を示した
説明図。FIG. 2 is an explanatory diagram showing a flow rate control characteristic of a fluid by the control valve.
【図3】従来の電動流量制御弁の中央縦断面図。FIG. 3 is a central longitudinal sectional view of a conventional electric flow control valve.
A…弁本体、1…第1流路、1a…流体流入口、2…第
2流路、2a…流体流出口、3…弁筐、4…弁筐弁室、
5…大径弁口、6…大径弁座、B…ステッピングモー
タ、7…キャン、8…ステータコイル、9…ロータ、1
0…弁体、C…ベン開閉機構、11…固定ガイド、12
…弁棒、13…係止具、21…第1弁体、22…第2弁
体、23…弁座当接面、24…第1弁室、25…連通
穴、26…小径弁座、27…小径弁口、28…弁ホル
ダ、29…弁ホルダの内周フランジ部、30…係合手
段、31…圧縮スプリング。A: valve body, 1 ... first flow path, 1a ... fluid inlet, 2 ... second flow path, 2a ... fluid outlet, 3 ... valve housing, 4 ... valve housing valve chamber,
5 large diameter valve port, 6 large diameter valve seat, B stepping motor, 7 can, 8 stator coil, 9 rotor, 1
0: valve element, C: ben opening / closing mechanism, 11: fixed guide, 12
... Valve stem, 13 ... Locking tool, 21 ... First valve body, 22 ... Second valve body, 23 ... Valve seat contact surface, 24 ... First valve chamber, 25 ... Communication hole, 26 ... Small diameter valve seat, 27: small-diameter valve port, 28: valve holder, 29: inner peripheral flange of the valve holder, 30: engagement means, 31: compression spring.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) F16K 1/00 - 1/54 F16K 31/00 - 31/11 F25B 41/06 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) F16K 1/00-1/54 F16K 31/00-31/11 F25B 41/06
Claims (1)
る流体流入口と第2流路が前記流入口と直交位置で接続
される流体流出口を開設し該流体流出口の弁筐弁室と連
通する大径弁口に大径弁座を設けた弁本体と、この弁本
体の流体流出口と反対側になる弁筐外側部に固定される
キャン及び該キャンの外側に配置されるステータコイル
を有し前記キャンの内側にステータコイルの通電励磁に
よって回動されるロータを設けたパルス制御可能なステ
ッピングモータと、前記弁本体の大径弁座に接離し該弁
口を開閉する弁体を有し該弁体を弁筐弁室内において前
記ステッピングモータのロータ回転によるネジ送り作用
で弁開閉方向に移動させる弁開閉機構とを具備した電動
流量制御弁において、前記弁体は、弁筐弁室内に摺動自在に支持されて大径弁
座に対して離接する大径の第2の弁体と、大径の第2の
弁体の内部に形成される第1の弁室内に摺動自在に支持
されて大径の第2の弁体に設けられる小径弁座に対して
離接して小径弁口を開閉する小径の第1弁体とを有する
とともに、 前記弁本体は小径の第1の弁体が所定の距離だけ小径弁
座から離れたときに当接する第1の弁体に設けた鍔状突
起と、第2の弁体に設けた係合手段と、第2の弁体を常
時大径弁座に向けて付勢するスプリングを備え、 弁開閉機構が作動されたとき、小径の第1の弁体が小径
弁座から離れる方向に作動される際に、弁筐弁室と連通
する第1の弁室と小径弁口との間の流路を開いて小流量
の流量制御を行なう小流量制御域と、 第1の弁体が第2の弁体に係合した後に、第2の弁体が
スプリングに抗して大径弁座から離れる方向に作動され
て弁筐弁室と大径弁口の間の流路を開いて大流量の流量
制御を行なう大流量制御域の2段の流量制御域を形成す
る電動流量制御弁。 1. A fluid inlet in which a first passage is connected to a valve housing having a valve chamber and a fluid outlet in which a second passage is connected at a position orthogonal to the inlet, and a fluid outlet is provided. A valve body having a large-diameter valve seat at a large-diameter valve port communicating with a valve housing valve chamber, a can fixed to an outer portion of a valve housing opposite to a fluid outlet of the valve main body, and a can outside the can. A pulse-controllable stepping motor having a stator coil disposed therein and a rotor provided inside the can and rotated by energization of the stator coil, and a valve opening which comes into contact with and separates from a large-diameter valve seat of the valve body. the electric flow control valve comprising a valve mechanism for moving the valve direction by a screw feed action of the rotor rotation of the stepping motor in the valve housing valve chamber the valve body having a valve body for opening and closing, the valve body Large diameter, slidably supported in the valve housing valve
A large-diameter second valve body which is separated from and attached to the seat;
Slidably supported in a first valve chamber formed inside the valve body
To the small-diameter valve seat provided on the large-diameter second valve body
A small-diameter first valve body that opens and closes the small-diameter valve port by separating and connecting
In addition, the valve body is configured such that the small-diameter first valve body is a small-diameter valve by a predetermined distance.
A collar-shaped protrusion provided on the first valve body that comes into contact when the user separates from the seat
And the engaging means provided on the second valve body and the second valve body
When the valve opening and closing mechanism is actuated, the first valve element having a small diameter is provided with a small diameter.
Communicates with valve housing when actuated away from valve seat
Open the flow path between the first valve chamber and the small diameter valve port
After the first valve body is engaged with the second valve body, the second valve body is
Operated in the direction away from the large diameter valve seat against the spring
To open the flow path between the valve housing and the large diameter
Forming a two-stage flow control area of a large flow control area for controlling
Electric flow control valve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7163162A JP2898906B2 (en) | 1995-06-29 | 1995-06-29 | Electric flow control valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7163162A JP2898906B2 (en) | 1995-06-29 | 1995-06-29 | Electric flow control valve |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0821554A JPH0821554A (en) | 1996-01-23 |
JP2898906B2 true JP2898906B2 (en) | 1999-06-02 |
Family
ID=15768418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7163162A Expired - Fee Related JP2898906B2 (en) | 1995-06-29 | 1995-06-29 | Electric flow control valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2898906B2 (en) |
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