JP6793945B2

JP6793945B2 - Electrical drive valve

Info

Publication number: JP6793945B2
Application number: JP2016251046A
Authority: JP
Inventors: 晋一海野
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2016-12-26
Filing date: 2016-12-26
Publication date: 2020-12-02
Anticipated expiration: 2036-12-26
Also published as: JP2018105387A

Description

本発明は、例えば流量制御弁等として使用される電動弁や電磁弁等の電気的駆動弁に関する。 The present invention relates to an electric drive valve such as an electric valve or a solenoid valve used as a flow control valve or the like.

電気的駆動弁の一種である電動弁の従来例を図４に示す。図示従来例の電動弁１’は、上部小径部２５ａと中間大径部２５ｂと下部中径部２５ｃとからなる弁軸２５の下端部に設けられた逆円錐状の弁体２４と、流体（例えば冷媒）入出口となる流体導入管（継手）６１及び流体導出管（継手）６２が連結されるとともに、前記弁体２４により開閉される弁口オリフィス２２が形成された弁座２９及び弁室２１を有する弁本体２０とを備え、前記弁座２９に対する弁体２４のリフト量を制御することにより冷媒等の流体の通過流量を調整するようになっている。前記弁本体２０の鍔状部材２３（に形成された段差部）には、天井部４０ａを有する下方開口の円筒状のキャン４０の下端部が突き合わせ溶接により密封接合されている。 FIG. 4 shows a conventional example of an electric valve, which is a type of electrically driven valve. The electric valve 1'of the conventional example shown is an inverted conical valve body 24 provided at the lower end of a valve shaft 25 composed of an upper small diameter portion 25a, an intermediate large diameter portion 25b, and a lower middle diameter portion 25c, and a fluid ( For example, a valve seat 29 and a valve chamber in which a fluid introduction pipe (joint) 61 and a fluid outlet pipe (joint) 62 serving as an inlet / outlet for a refrigerant) are connected and a valve opening orifice 22 opened and closed by the valve body 24 is formed. A valve body 20 having 21 is provided, and the flow rate of a fluid such as a refrigerant is adjusted by controlling the lift amount of the valve body 24 with respect to the valve seat 29. The lower end of the cylindrical can 40 having a lower opening having the ceiling portion 40a is hermetically sealed and joined to the flange-shaped member 23 (the stepped portion formed in) of the valve body 20 by butt welding.

前記キャン４０の内周には、所定の間隙αをあけてロータ５６が配在され、該ロータ５６を回転駆動すべく前記キャン４０の円筒状部分の外周には、ヨーク５１、ボビン５２、ステータコイル５３、及び樹脂モールドカバー５４等からなるステータ５５が外嵌されており、前記ロータ５６とステータ５５とでステッピングモータ５０が構成される。 A rotor 56 is arranged on the inner circumference of the can 40 with a predetermined gap α, and a yoke 51, a bobbin 52, and a stator are arranged on the outer circumference of a cylindrical portion of the can 40 in order to drive the rotor 56 to rotate. A stator 55 composed of a coil 53, a resin mold cover 54 and the like is fitted on the outside, and the rotor 56 and the stator 55 constitute a stepping motor 50.

そして、ロータ５６と弁軸２５との間には、ロータ５６の回転を利用して前記弁体２４を前記弁座２９に接離又は近接離間させる駆動機構が設けられている。この駆動機構は、弁本体２０にその下端部２６ａが圧入固定されるとともに、弁軸２５（の中間大径部２５ｂ）が摺動自在に内挿された筒状のガイドブッシュ２６の外周に形成された固定ねじ部（雄ねじ部）２８と、前記弁軸２５及びガイドブッシュ２６の外周に配在された下方開口の筒状の弁軸ホルダ３２の内周に形成されて前記固定ねじ部２８に螺合せしめられた移動ねじ部（雌ねじ部）３８とからなるねじ送り機構３０で構成されている。 A drive mechanism is provided between the rotor 56 and the valve shaft 25 to bring the valve body 24 into contact with or close to the valve seat 29 by utilizing the rotation of the rotor 56. This drive mechanism is formed on the outer periphery of a tubular guide bush 26 in which the lower end portion 26a is press-fitted and fixed to the valve body 20 and the valve shaft 25 (intermediate large diameter portion 25b) is slidably inserted. The fixing screw portion (male screw portion) 28 is formed on the inner circumference of the valve shaft 25 and the tubular valve shaft holder 32 having a lower opening arranged on the outer periphery of the guide bush 26, and is formed on the fixing screw portion 28. It is composed of a screw feed mechanism 30 including a moving screw portion (female screw portion) 38 screwed together.

前記弁軸ホルダ３２とロータ５６とは支持リング３６を介して結合されるとともに、その支持リング３６に弁軸ホルダ３２の上部突部がかしめ固定され、これにより、ロータ５６、支持リング３６及び弁軸ホルダ３２が一体的に連結されている。 The valve shaft holder 32 and the rotor 56 are connected via a support ring 36, and the upper protrusion of the valve shaft holder 32 is caulked and fixed to the support ring 36, whereby the rotor 56, the support ring 36 and the valve are fixed. The shaft holder 32 is integrally connected.

前記ガイドブッシュ２６には、ロータ５６（弁軸ホルダ３２）の回転下動規制を行うストッパ機構３１の一方を構成する下ストッパ体（固定ストッパ）２７が固着され、弁軸ホルダ３２には、ストッパ機構３１の他方を構成する上ストッパ体（移動ストッパ）３７が固着されている。 A lower stopper body (fixed stopper) 27 constituting one of the stopper mechanisms 31 that regulates the rotation downward movement of the rotor 56 (valve shaft holder 32) is fixed to the guide bush 26, and a stopper is attached to the valve shaft holder 32. The upper stopper body (moving stopper) 37 constituting the other side of the mechanism 31 is fixed.

また、前記ガイドブッシュ２６の上部小径部２６ｂが弁軸ホルダ３２の上部に内挿されるとともに、弁軸ホルダ３２の天井部３２ａ中央に形成された挿通穴３２ｂに、弁軸２５の上部小径部２５ａが挿通せしめられている。弁軸２５の上部小径部２５ａの上端部（挿通穴３２ｂから突出した部分）には、プッシュナット３３が固着（圧入固定）されている。上ストッパ体３７が下ストッパ体２７に当接しておらず、かつ弁体２４が弁座２９に当接していないときには、後述する圧縮コイルばね３４の弾発力により、弁軸ホルダ３２の天井部３２ａはプッシュナット３３の底面に押し付けられている。 Further, the upper small diameter portion 26b of the guide bush 26 is inserted into the upper portion of the valve shaft holder 32, and the upper small diameter portion 25a of the valve shaft 25 is inserted into the insertion hole 32b formed in the center of the ceiling portion 32a of the valve shaft holder 32. Is inserted. A push nut 33 is fixed (press-fitted and fixed) to the upper end portion (the portion protruding from the insertion hole 32b) of the upper small diameter portion 25a of the valve shaft 25. When the upper stopper body 37 is not in contact with the lower stopper body 27 and the valve body 24 is not in contact with the valve seat 29, the elastic force of the compression coil spring 34 described later causes the ceiling portion of the valve shaft holder 32. The 32a is pressed against the bottom surface of the push nut 33.

さらに、前記弁軸２５は、該弁軸２５の上部小径部２５ａに外挿され、かつ、弁軸ホルダ３２の天井部３２ａと弁軸２５における中間大径部２５ｂの上端段丘面との間に縮装された弁締め切り兼緩衝用の圧縮コイルばね３４によって、常時下方（閉弁方向）に付勢されている。この場合、前記圧縮コイルばね３４は、その上端部がワッシャ等のばね受け部材３９を介して前記弁軸ホルダ３２の天井部３２ａ下面に係止されている。なお、弁軸ホルダ３２の天井部３２ａ上には、コイルばねからなる復帰ばね３５が配在されている。この復帰ばね３５は、駆動機構によりロータ５６が上昇して移動ねじ部（雌ねじ部）３８と固定ねじ部（雄ねじ部）２８との螺合が外れた後、ロータ５６の下降によって、再度、移動ねじ部３８を固定ねじ部２８に螺合させるために設けられている。 Further, the valve shaft 25 is extrapolated to the upper small diameter portion 25a of the valve shaft 25, and is between the ceiling portion 32a of the valve shaft holder 32 and the upper terrace surface of the intermediate large diameter portion 25b of the valve shaft 25. It is always urged downward (valve closing direction) by the compressed valve shutoff / buffer compression coil spring 34. In this case, the upper end of the compression coil spring 34 is locked to the lower surface of the ceiling portion 32a of the valve shaft holder 32 via a spring receiving member 39 such as a washer. A return spring 35 made of a coil spring is arranged on the ceiling portion 32a of the valve shaft holder 32. The return spring 35 is moved again by the lowering of the rotor 56 after the rotor 56 is raised by the drive mechanism and the screw between the moving screw portion (female screw portion) 38 and the fixing screw portion (male screw portion) 28 is disengaged. It is provided to screw the screw portion 38 into the fixing screw portion 28.

このような構成とされた電動弁１’にあっては、ステータコイル５３に対する通電（パルス供給）制御を行うことにより、弁本体２０に固定されたガイドブッシュ２６に対し、ロータ５６及び弁軸ホルダ３２が一体に回転せしめられ、ガイドブッシュ２６の固定ねじ部２８と弁軸ホルダ３２の移動ねじ部３８とのねじ送りにより、弁軸２５（弁体２４）が昇降して、弁口オリフィス２２が開閉される。したがって、かかる電動弁１’にあっては、ロータ５６の回転量により弁体２４のリフト量（弁開度）、すなわち流体の通過流量を調整することができ、ロータ５６の回転量は供給パルス数により制御されるため、流体通過流量を高精度に調整することができる（下記特許文献１参照）。 In the motorized valve 1'with such a configuration, the rotor 56 and the valve shaft holder are attached to the guide bush 26 fixed to the valve body 20 by controlling the energization (pulse supply) of the stator coil 53. The 32 is integrally rotated, and the valve shaft 25 (valve body 24) is raised and lowered by the screw feed between the fixing screw portion 28 of the guide bush 26 and the moving screw portion 38 of the valve shaft holder 32, and the valve opening orifice 22 is raised. It is opened and closed. Therefore, in the electric valve 1', the lift amount (valve opening) of the valve body 24, that is, the flow rate through which the fluid passes can be adjusted by the rotation amount of the rotor 56, and the rotation amount of the rotor 56 is the supply pulse. Since it is controlled by the number, the fluid passing flow rate can be adjusted with high accuracy (see Patent Document 1 below).

特開２００１−５０４１５号公報Japanese Unexamined Patent Publication No. 2001-50415

ところで、前記した如くの従来例の電動弁は、一般に、空気調和機、冷凍機等の冷凍サイクルに流量制御弁等として組み込まれ、流体導入管から弁室に流入し、弁体により開閉される弁口オリフィスを介して流体導出管に流される冷媒の流量を制御するために使用されているが、近年では、当該電動弁の制御性の観点から、例えば空気や水等といった冷媒以外の流体の流量制御にも当該電動弁を使用することが提案されている。 By the way, the electric valve of the conventional example as described above is generally incorporated as a flow rate control valve or the like in a refrigerating cycle of an air conditioner, a refrigerating machine or the like, flows into a valve chamber from a fluid introduction pipe, and is opened and closed by a valve body. It is used to control the flow rate of the refrigerant flowing through the valve port orifice to the fluid outlet pipe, but in recent years, from the viewpoint of controllability of the electric valve, for example, a fluid other than the refrigerant such as air and water. It has been proposed to use the electric valve for flow control as well.

しかしながら、上記従来例の電動弁は、ロータが配置されたキャン内に流体（冷媒）が流入する構造、つまり、キャン内と弁室とが流通する構造であるので、前記のように冷媒に代えて空気や水等の流体の流量制御に使用する場合、弁室からキャン内に流入する流体（例えば、湿気を含んだ空気や水）が当該電動弁の動作不良を引き起こすおそれがあった。 However, the motorized valve of the above-mentioned conventional example has a structure in which a fluid (refrigerant) flows into a can in which a rotor is arranged, that is, a structure in which the inside of the can and the valve chamber circulate. When used for controlling the flow rate of a fluid such as air or water, the fluid flowing into the can from the valve chamber (for example, air or water containing moisture) may cause a malfunction of the motorized valve.

本発明は、前記課題に鑑みてなされたものであって、その目的とするところは、電動弁や電磁弁等の電気的駆動弁の使用用途を拡大しつつ、動作不良を可及的に抑えることのできる電気的駆動弁を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to suppress malfunctions as much as possible while expanding the applications of electrically driven valves such as electric valves and solenoid valves. The purpose is to provide an electrically driven valve that can be used.

上記する課題を解決するために、本発明に係る電気的駆動弁は、基本的に、弁体が設けられた弁軸と、前記弁体が接離又は近接離間する弁座部を有する弁口オリフィスが形成された弁座を備えるとともに、流体が導入導出される弁室が形成された弁本体と、前記弁本体に固定されたガイドブッシュに摺動自在に内挿された前記弁軸に設けられた前記弁体を電気的駆動力を利用して前記弁座部に対して昇降させるための昇降駆動部と、を備える電気的駆動弁であって、前記弁室と前記昇降駆動部との間をシールするシール部材が、前記弁本体と前記ガイドブッシュとによって挟持されており、前記弁本体における前記弁室の天井部に、前記弁軸が挿通される通し穴及び前記ガイドブッシュが固定される嵌合穴が設けられ、前記通し穴と前記嵌合穴との間に凹穴が設けられ、前記シール部材が、前記凹穴内で前記弁軸に外装されて配在されており、前記シール部材は、内端が前記弁軸の外周に当接せしめられ、外端が前記ガイドブッシュと前記凹穴内に配置された弾性部材とで挟持された環状部材で構成されており、前記弾性部材と前記弁軸との間に隔離壁が設けられていることを特徴としている。 In order to solve the above-mentioned problems, the electrically driven valve according to the present invention basically has a valve shaft provided with a valve body and a valve port having a valve seat portion in which the valve body is brought into contact with or close to each other. A valve seat having an orifice is provided, and a valve body in which a valve chamber into which a fluid is introduced and taken out is formed, and a valve shaft slidably inserted in a guide bush fixed to the valve body. An electric drive valve including an elevating drive unit for raising and lowering the valve body with respect to the valve seat portion by using an electric driving force, wherein the valve chamber and the elevating drive unit are provided. A sealing member for sealing the space is sandwiched between the valve body and the guide bush, and a through hole through which the valve shaft is inserted and the guide bush are fixed to the ceiling of the valve chamber in the valve body. A fitting hole is provided, a concave hole is provided between the through hole and the fitting hole, and the sealing member is arranged so as to be exteriorly mounted on the valve shaft in the concave hole. The member is composed of an annular member whose inner end is brought into contact with the outer periphery of the valve shaft and whose outer end is sandwiched between the guide bush and the elastic member arranged in the concave hole. It is characterized in that an isolation wall is provided between the valve shaft and the valve shaft .

更に好ましい態様では、前記環状部材は、前記ガイドブッシュと前記弾性部材との間に配置される平板状部と、該平板状部の内端から突設されて前記弁軸の外周に当接せしめられる筒状部とで構成される。 In a more preferred embodiment, the annular member is projected from the inner end of the flat plate-shaped portion arranged between the guide bush and the elastic member and brought into contact with the outer periphery of the valve shaft. It is composed of a tubular part to be formed.

更に好ましい態様では、前記隔離壁は前記弁本体と一体に成形される。 In a more preferred embodiment, the isolation wall is formed integrally with the valve body.

本発明によれば、弁本体に形成された弁室と昇降駆動部との間をシールするシール部材が、弁本体と該弁本体に固定されたガイドブッシュとによって挟持されており、当該シール部材によって弁室から昇降駆動部（例えばキャン内）への流体の流入が阻止されるので、簡単な構成でもって、電動弁や電磁弁等の電気的駆動弁の使用用途を拡大しつつ、動作不良を可及的に抑えることができる。 According to the present invention, a seal member that seals between the valve chamber formed in the valve body and the elevating drive unit is sandwiched between the valve body and the guide bush fixed to the valve body, and the seal member. Since the inflow of fluid from the valve chamber to the elevating drive unit (for example, inside the can) is blocked by this, the operation malfunction while expanding the usage of the electric drive valve such as the electric valve and the solenoid valve with a simple configuration. Can be suppressed as much as possible.

本発明に係る電気的駆動弁（電動弁）の一実施形態を示す縦断面図。The vertical sectional view which shows one Embodiment of the electric drive valve (electric valve) which concerns on this invention. 図１に示される電動弁の要部拡大断面図。FIG. 1 is an enlarged cross-sectional view of a main part of the motorized valve shown in FIG. 図１、２に示される電動弁の他例の要部拡大断面図。An enlarged cross-sectional view of a main part of another example of the motorized valve shown in FIGS. 1 and 2. 従来の電動弁を示す縦断面図。A vertical sectional view showing a conventional motorized valve.

以下、本発明の実施形態を図面を参照しながら説明する。なお、各図において、部材間に形成される隙間や部材間の離隔距離等は、発明の理解を容易にするため、また、作図上の便宜を図るため、誇張して描かれている場合がある。また、本明細書において、上下、左右等の位置、方向を表わす記述は、図１の方向矢印表示を基準としており、実際の使用状態での位置、方向を指すものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the gaps formed between the members, the separation distance between the members, etc. may be exaggerated in order to facilitate understanding of the invention and for convenience in drawing. is there. Further, in the present specification, the description indicating the position and direction such as up and down, left and right, etc. is based on the direction arrow display of FIG. 1, and does not indicate the position and direction in the actual use state.

図１は、本発明に係る電気的駆動弁（電動弁）の一実施形態を示す縦断面図、図２は、その要部拡大断面図である。 FIG. 1 is a vertical sectional view showing an embodiment of an electrically driven valve (electric valve) according to the present invention, and FIG. 2 is an enlarged sectional view of a main part thereof.

本実施形態の電動弁１の基本構成は、前述した図４に示される従来例の電動弁１’とほぼ同じであるので、従来例の電動弁１’の各部に対応する部分には共通の符号を付している。 Since the basic configuration of the motor-operated valve 1 of the present embodiment is almost the same as that of the conventional motor-operated valve 1'shown in FIG. 4 described above, it is common to the parts corresponding to each part of the conventional motor-operated valve 1'. It is signed.

図示実施形態の電動弁１は、基本的に、段付き逆円錐状の弁体２４が下端部に設けられた弁軸２５と、流体（例えば冷媒）入出口となる流体導入管（継手）６１及び流体導出管（継手）６２が連結されるとともに、前記弁体２４により開閉される弁口オリフィス２２が形成された弁座（弁座部材）２９及び流体が導入導出される弁室２１を有する弁本体２０とを備える。 The motorized valve 1 of the illustrated embodiment basically has a valve shaft 25 having a stepped inverted conical valve body 24 provided at the lower end portion and a fluid introduction pipe (joint) 61 serving as an inlet / outlet for a fluid (for example, a refrigerant). It also has a valve seat (valve seat member) 29 formed with a valve opening orifice 22 opened and closed by the valve body 24 and a valve chamber 21 into which the fluid is introduced and led out, while the fluid outlet pipe (joint) 62 is connected. It includes a valve body 20.

本例では、前記弁軸２５は、上部小径部２５ａと中間大径部２５ｂと下部小径部２５ｃとからなり、その弁軸２５（の下部小径部２５ｃ）の下端部に、（上側から）逆円錐台面からなる上部弁体部２４ａと比較的細径の下部挿通部２４ｂとからなる前記弁体２４が一体的に設けられている。 In this example, the valve shaft 25 is composed of an upper small diameter portion 25a, an intermediate large diameter portion 25b, and a lower small diameter portion 25c, and is reversed (from above) to the lower end portion of the valve shaft 25 (lower small diameter portion 25c). The valve body 24 including an upper valve body portion 24a made of a conical base surface and a lower insertion portion 24b having a relatively small diameter is integrally provided.

また、弁本体２０の側部開口に前記流体導入管６１がろう付け等により連結され、下部開口に前記流体導出管６２がろう付け等により連結されており、前記弁本体２０の下部開口と弁室２１との間（具体的には、その間に設けられた内周段差部）に、天井部２９ｂ付き略円筒状の弁座２９が圧入・かしめ等により装着されている。この弁座２９の天井部２９ｂ外周には、弁本体２０の下部開口と弁室２１との間の内周段差部と相補的な形状を有する段差２９ｃが形成されるとともに、天井部２９ｂの中央に、前記弁体２４（の上部弁体部２４ａ）が接離又は近接離間する弁座部２９ａを有する弁口オリフィス２２が形成されている。また、前記弁本体２０の内部に設けられた弁室２１の天井部２１ａには、前記弁軸２５（の中間大径部２５ｂ）が若干の隙間をあけて挿通（内挿）される通し穴２１ｂが設けられるとともに、前記弁体部２０の上部中央（すなわち、弁室２１の天井部２１ａの上側）には、後述するガイドブッシュ２６の下端部２６ａが嵌合固定される嵌合穴２１ｄが設けられている。 Further, the fluid introduction pipe 61 is connected to the side opening of the valve body 20 by brazing or the like, and the fluid outlet pipe 62 is connected to the lower opening by brazing or the like, and the lower opening of the valve body 20 and the valve are connected. A substantially cylindrical valve seat 29 with a ceiling portion 29b is mounted between the chamber 21 and (specifically, an inner peripheral step portion provided between them) by press fitting, caulking, or the like. A step 29c having a shape complementary to the inner peripheral step portion between the lower opening of the valve body 20 and the valve chamber 21 is formed on the outer periphery of the ceiling portion 29b of the valve seat 29, and the center of the ceiling portion 29b. A valve opening orifice 22 having a valve seat portion 29a in which the valve body 24 (the upper valve body portion 24a) is brought into contact with or close to each other is formed. Further, a through hole through which the valve shaft 25 (intermediate large diameter portion 25b) is inserted (interpolated) into the ceiling portion 21a of the valve chamber 21 provided inside the valve body 20 with a slight gap. 21b is provided, and a fitting hole 21d into which the lower end portion 26a of the guide bush 26, which will be described later, is fitted and fixed is provided in the upper center of the valve body portion 20 (that is, above the ceiling portion 21a of the valve chamber 21). It is provided.

前記弁本体２０の上部外周に設けられた鍔状部材２３（に形成された段差部）には、天井部４０ａを有する下方開口の円筒状のキャン４０の下端部が突き合わせ溶接により密封接合されている。 The lower end of a cylindrical can 40 having a lower opening having a ceiling portion 40a is hermetically sealed and joined to a flange-shaped member 23 (a step portion formed in) provided on the upper outer periphery of the valve body 20 by butt welding. There is.

ロータ５６と弁軸２５との間には、ロータ５６の回転を利用して前記弁体２４を前記弁座２９（の弁座部２９ａ）に接離又は近接離間させる駆動機構が設けられている。この駆動機構は、弁本体２０の上部中央に設けられた嵌合穴２１ｄにその下端部２６ａが圧入固定されるとともに、弁軸２５（の中間大径部２５ｂ）が摺動自在に内挿された筒状のガイドブッシュ２６の外周に形成された固定ねじ部（雄ねじ部）２８と、前記弁軸２５及びガイドブッシュ２６の外周に配在された下方開口の筒状の弁軸ホルダ３２の内周に形成されて前記固定ねじ部２８に螺合せしめられた移動ねじ部（雌ねじ部）３８とからなるねじ送り機構３０で構成されている。 A drive mechanism is provided between the rotor 56 and the valve shaft 25 to bring the valve body 24 into contact with or close to the valve seat 29 (valve seat portion 29a) by utilizing the rotation of the rotor 56. .. In this drive mechanism, the lower end portion 26a is press-fitted and fixed to the fitting hole 21d provided in the upper center of the valve body 20, and the valve shaft 25 (intermediate large diameter portion 25b) is slidably inserted. Inside the fixing screw portion (male screw portion) 28 formed on the outer circumference of the tubular guide bush 26 and the downward-opening tubular valve shaft holder 32 arranged on the outer circumference of the valve shaft 25 and the guide bush 26. It is composed of a screw feed mechanism 30 including a moving screw portion (female screw portion) 38 formed on the circumference and screwed into the fixing screw portion 28.

前記ガイドブッシュ２６の外周には、ロータ５６（弁軸ホルダ３２）の回転下動規制を行うストッパ機構３１の一方を構成する下ストッパ体（固定ストッパ）２７が固着され、弁軸ホルダ３２の外周には、ストッパ機構３１の他方を構成する上ストッパ体（移動ストッパ）３７が固着されている。 A lower stopper body (fixed stopper) 27 constituting one of the stopper mechanisms 31 that regulates the rotation downward movement of the rotor 56 (valve shaft holder 32) is fixed to the outer circumference of the guide bush 26, and the outer circumference of the valve shaft holder 32 is fixed. An upper stopper body (moving stopper) 37 constituting the other side of the stopper mechanism 31 is fixed to the stopper.

また、前記ガイドブッシュ２６の上部小径部２６ｂが弁軸ホルダ３２の上部に内挿されるとともに、弁軸ホルダ３２の天井部３２ａ中央に形成された挿通穴３２ｂに、弁軸２５の上部小径部２５ａが挿通せしめられている。弁軸２５の上部小径部２５ａの上端部（挿通穴３２ｂから突出した部分）には、プッシュナット３３が固着（圧入固定）されている。 Further, the upper small diameter portion 26b of the guide bush 26 is inserted into the upper portion of the valve shaft holder 32, and the upper small diameter portion 25a of the valve shaft 25 is inserted into the insertion hole 32b formed in the center of the ceiling portion 32a of the valve shaft holder 32. Is inserted. A push nut 33 is fixed (press-fitted and fixed) to the upper end portion (the portion protruding from the insertion hole 32b) of the upper small diameter portion 25a of the valve shaft 25.

さらに、前記弁軸２５は、該弁軸２５の上部小径部２５ａに外挿され、かつ、弁軸ホルダ３２の天井部３２ａと弁軸２５における中間大径部２５ｂの上端段丘面との間に縮装された弁締め切り兼緩衝用の圧縮コイルばね３４によって、常時下方（閉弁方向）に付勢されている。この場合、前記圧縮コイルばね３４の上端部は、ワッシャ等のばね受け部材３９を介して前記弁軸ホルダ３２の天井部３２ａ下面に係止されている。なお、弁軸ホルダ３２の天井部３２ａ上には、コイルばねからなる復帰ばね３５が配在されている。 Further, the valve shaft 25 is extrapolated to the upper small diameter portion 25a of the valve shaft 25, and is between the ceiling portion 32a of the valve shaft holder 32 and the upper terrace surface of the intermediate large diameter portion 25b of the valve shaft 25. It is always urged downward (valve closing direction) by the compressed valve shutoff / buffer compression coil spring 34. In this case, the upper end portion of the compression coil spring 34 is locked to the lower surface of the ceiling portion 32a of the valve shaft holder 32 via a spring receiving member 39 such as a washer. A return spring 35 made of a coil spring is arranged on the ceiling portion 32a of the valve shaft holder 32.

前記キャン４０の内周及び外周に配在されたロータ５６とステータ５５とからなるステッピングモータ５０、弁軸２５（の中間大径部２５ｂ）が摺動自在に内挿されたガイドブッシュ２６、ガイドブッシュ２６の外周に形成された固定ねじ部２８と弁軸ホルダ３２の内周に形成された移動ねじ部３８とからなるねじ送り機構（駆動機構）３０、ガイドブッシュ２６の外周に固着された下ストッパ体２７と弁軸ホルダ３２の外周に固着された上ストッパ体３７とからなるストッパ機構３１、圧縮コイルばね３４等で、弁座２９に形成された弁口オリフィス２２の弁座部２９ａに対して弁体２４を昇降させる昇降駆動部が構成される。 A stepping motor 50 composed of a rotor 56 and a stator 55 arranged on the inner and outer circumferences of the can 40, a guide bush 26 and a guide in which a valve shaft 25 (intermediate large diameter portion 25b) is slidably inserted. A screw feed mechanism (drive mechanism) 30 composed of a fixing screw portion 28 formed on the outer circumference of the bush 26 and a moving screw portion 38 formed on the inner circumference of the valve shaft holder 32, and a lower portion fixed to the outer circumference of the guide bush 26. A stopper mechanism 31 composed of a stopper body 27 and an upper stopper body 37 fixed to the outer periphery of the valve shaft holder 32, a compression coil spring 34, etc., with respect to the valve seat portion 29a of the valve opening orifice 22 formed on the valve seat 29. A lifting drive unit for raising and lowering the valve body 24 is configured.

上記に加えて、本実施形態の電動弁１では、弁本体２０の内部に形成された弁室２１と昇降駆動部を構成するキャン４０内（円筒状空所）との間をシール（密閉封止）するためのシール部材７０が装備されている。 In addition to the above, in the motorized valve 1 of the present embodiment, the space between the valve chamber 21 formed inside the valve body 20 and the inside of the can 40 (cylindrical space) constituting the elevating drive unit is sealed (sealed). A seal member 70 for stopping) is equipped.

詳細には、前記弁本体２０における弁室２１の天井部２１ａに設けられた通し穴２１ｂと嵌合穴２１ｄとの間に、通し穴２１ｂと嵌合穴２１ｄの穴径の略中間の穴径を有する凹穴２１ｃが設けられている。 Specifically, the hole diameter between the through hole 21b and the fitting hole 21d provided in the ceiling portion 21a of the valve chamber 21 in the valve body 20 is substantially intermediate between the hole diameters of the through hole 21b and the fitting hole 21d. A concave hole 21c is provided.

シール部材７０は、前記凹穴２１ｃ内に圧縮状態で配在されたゴム製のＯリング７１と、Ｏリング７１と当該凹穴２１ｃ内を通る弁軸２５（の中間大径部２５ｂ）との間に介装されたテフロン（登録商標）製のリング状部材７２とを有している。言い換えれば、前記シール部材７０は、凹穴２１ｃ内で弁軸２５（の中間大径部２５ｂ）にリング状部材７２が摺動可能に外装され、そのリング状部材７２の外周にＯリング７１が圧縮状態で配在されて構成されている。前記Ｏリング７１は、その内周がリング状部材７２の外周（面）に圧接（密着）せしめられ、その外周が凹穴２１ｃの周壁面２１ｃａに圧接（密着）せしめられ、その下部が凹穴２１ｃの底面２１ｃｂに圧接せしめられ、その上部がガイドブッシュ２６（の下端部２６ａ）の下面に圧接せしめられるようにして、前記凹穴２１ｃ内に装着されている。 The seal member 70 is a rubber O-ring 71 arranged in a compressed state in the concave hole 21c, and a valve shaft 25 (intermediate large diameter portion 25b) passing through the concave hole 21c. It has a ring-shaped member 72 made of Teflon (registered trademark) interposed between them. In other words, in the sealing member 70, the ring-shaped member 72 is slidably mounted on the valve shaft 25 (intermediate large diameter portion 25b) in the concave hole 21c, and the O-ring 71 is provided on the outer periphery of the ring-shaped member 72. It is distributed and configured in a compressed state. The inner circumference of the O-ring 71 is pressed (closely adhered) to the outer circumference (surface) of the ring-shaped member 72, the outer circumference thereof is pressed (closely adhered) to the peripheral wall surface 21ca of the concave hole 21c, and the lower portion thereof is a concave hole. It is mounted in the recessed hole 21c so that it is pressed against the bottom surface 21cc of the 21c and its upper portion is pressed against the lower surface of the guide bush 26 (lower end portion 26a).

なお、前記シール部材７０（Ｏリング７１及びリング状部材７２）の組み付けにあたっては、例えば、リング状部材７２とＯリング７１を中間大径部２５ｂの所定位置に（例えば下側から）外装するとともにガイドブッシュ２６等を組み付けた弁軸２５を、弁本体２０に設けられた嵌合穴２１ｄを介して通し穴２１ｂ及び弁室２１に挿入するようにし、前記Ｏリング７１を圧縮しながら前記リング状部材７２とＯリング７１を嵌合穴２１ｄと通し穴２１ｂとの間に設けられた凹穴２１ｃに嵌め込めば良い。 When assembling the seal member 70 (O-ring 71 and ring-shaped member 72), for example, the ring-shaped member 72 and the O-ring 71 are externally attached to a predetermined position (for example, from the lower side) of the intermediate large diameter portion 25b. The valve shaft 25 to which the guide bush 26 and the like are assembled is inserted into the through hole 21b and the valve chamber 21 through the fitting hole 21d provided in the valve body 20, and the O-ring 71 is compressed and the ring shape is formed. The member 72 and the O-ring 71 may be fitted into the concave hole 21c provided between the fitting hole 21d and the through hole 21b.

このような構成とされた電動弁１においても、前述した図４に示される従来例の電動弁１’と同様、ステータコイル５３に対する通電（パルス供給）制御を行うことにより、弁本体２０に固定されたガイドブッシュ２６に対し、ロータ５６及び弁軸ホルダ３２が一体に回転せしめられ、ガイドブッシュ２６の固定ねじ部２８と弁軸ホルダ３２の移動ねじ部３８とのねじ送りにより、弁軸２５（弁体２４）が昇降して、弁口オリフィス２２が開閉される。したがって、ロータ５６の回転量により弁体２４のリフト量（弁開度）、すなわち流体の通過流量を調整することができ、ロータ５６の回転量は供給パルス数により制御されるため、流体通過流量が高精度に調整される。 The motorized valve 1 having such a configuration is also fixed to the valve body 20 by controlling the energization (pulse supply) of the stator coil 53, as in the conventional motorized valve 1'shown in FIG. The rotor 56 and the valve shaft holder 32 are integrally rotated with respect to the guide bush 26, and the valve shaft 25 (the valve shaft 25 () is fed by screw feeding between the fixing screw portion 28 of the guide bush 26 and the moving screw portion 38 of the valve shaft holder 32. The valve body 24) moves up and down to open and close the valve opening orifice 22. Therefore, the lift amount (valve opening) of the valve body 24, that is, the fluid passing flow rate can be adjusted by the rotation amount of the rotor 56, and the rotation amount of the rotor 56 is controlled by the number of supply pulses. Is adjusted with high precision.

また、本実施形態の電動弁１においては、弁本体２０における弁室２１の天井部２１ａの通し穴２１ｂと嵌合穴２１ｄとの間に凹穴２１ｃが設けられ、弁本体２０に形成された弁室２１と昇降駆動部との間をシールするシール部材７０（Ｏリング７１及びリング状部材７２）が、その凹穴２１ｃ内で弁軸２５（の中間大径部２５ｂ）に外装されて配在されるとともに、凹穴２１ｃの底面２１ｃｂと弁本体２０に固定されたガイドブッシュ２６（の下端部２６ａ）の下面とによって挟持されている。そのため、当該シール部材７０によって弁室２１から昇降駆動部（例えばキャン４０内）への流体の流入が阻止されるので、簡単な構成でもって、当該電動弁１の使用用途を拡大しつつ、動作不良を可及的に抑えることができる。 Further, in the motorized valve 1 of the present embodiment, a concave hole 21c is provided between the through hole 21b of the ceiling portion 21a of the valve chamber 21 and the fitting hole 21d in the valve body 20, and is formed in the valve body 20. A sealing member 70 (O-ring 71 and ring-shaped member 72) that seals between the valve chamber 21 and the elevating drive portion is arranged so as to be exteriorized on the valve shaft 25 (intermediate large diameter portion 25b) in the concave hole 21c. It is present and is sandwiched between the bottom surface 21 cc of the concave hole 21 c and the bottom surface of the guide bush 26 (lower end portion 26 a) fixed to the valve body 20. Therefore, the seal member 70 prevents the inflow of fluid from the valve chamber 21 into the elevating drive unit (for example, inside the can 40), so that the electric valve 1 can be operated while expanding its usage with a simple configuration. Defects can be suppressed as much as possible.

また、前記シール部材７０により、昇降駆動部（例えばキャン４０内）から弁室２１への異物（例えば、電動弁１の動作によって発生する摩耗粉等）の混入を阻止できるといった効果も得られる。 Further, the seal member 70 also has an effect of preventing foreign matter (for example, abrasion powder generated by the operation of the motorized valve 1) from being mixed into the valve chamber 21 from the elevating drive unit (for example, in the can 40).

また、本実施形態では、シール部材７０を構成するＯリング７１と弁軸２５との間に摺動抵抗の低いテフロン（登録商標）製のリング状部材７２が介装されているので、シール性を確保したままで当該シール部材７０と弁軸２５との摺動性を良くすることができる。 Further, in the present embodiment, a ring-shaped member 72 made of Teflon (registered trademark) having a low sliding resistance is interposed between the O-ring 71 constituting the seal member 70 and the valve shaft 25, so that the sealability is good. The slidability between the seal member 70 and the valve shaft 25 can be improved while maintaining the above.

なお、上記した実施形態におけるシール部材７０に代えて、例えば図３に拡大図示される如くのシール部材７５を適用してもよい。 In addition, instead of the seal member 70 in the above-described embodiment, for example, the seal member 75 as shown in the enlarged view in FIG. 3 may be applied.

図３に示されるシール部材７５は、円環状の平板状部７５ａと、該平板状部７５ａの内端から上向きに突設された短円筒状の筒状部７５ｂとを有する、テフロン（登録商標）製の環状部材で形成されている。シール部材（環状部材）７５の内端の筒状部７５ｂは、弁軸２５（ここでは、下部小径部２５ｃ）の外周に摺動自在に当接せしめられるとともに、平板状部７５ａが、弁本体２０の凹穴２１ｃの底面２１ｃｂ上に圧縮状態で配置されたＯリング（弾性部材）６９とガイドブッシュ２６（の下端部２６ａ）の下面とで挟持されている。言い換えれば、シール部材７５の筒状部７５ｂが、弁軸２５の外周に摺動自在に当接せしめられるとともに、その平板状部７５ａは、弁本体２０の凹穴２１ｃの底面２１ｃｂ上に配置されたＯリング６９によってガイドブッシュ２６（の下端部２６ａ）の下面に圧接（密着）せしめられている。 The seal member 75 shown in FIG. 3 has an annular flat plate-shaped portion 75a and a short cylindrical tubular portion 75b projecting upward from the inner end of the flat plate-shaped portion 75a, Teflon (registered trademark). ) Is formed of an annular member. The tubular portion 75b at the inner end of the seal member (annular member) 75 is slidably brought into contact with the outer circumference of the valve shaft 25 (here, the lower small diameter portion 25c), and the flat plate-shaped portion 75a is the valve body. It is sandwiched between an O-ring (elastic member) 69 arranged in a compressed state on the bottom surface 21cc of the concave hole 21c of 20 and the lower surface of the guide bush 26 (lower end portion 26a). In other words, the tubular portion 75b of the seal member 75 is slidably brought into contact with the outer periphery of the valve shaft 25, and the flat plate-shaped portion 75a is arranged on the bottom surface 21cc of the concave hole 21c of the valve body 20. The O-ring 69 is pressed against the lower surface of the guide bush 26 (lower end portion 26a).

また、図３に示される例では、前記Ｏリング６９と弁軸２５との接触を避けて摺動抵抗を低減するとともに前記凹穴２１ｃ内でのＯリング６９の位置ずれを防止すべく、凹穴２１ｃ（の底面２１ｃｂ）の内端に、円筒状の隔離壁６８が一体的に突設されており、Ｏリング６９と弁軸２５との間に、弁本体２０と一体に成形された前記隔離壁６８が介在されている。なお、この場合、弁軸２５の下部小径部２５ｃが上下方向で長く形成され、前記弁本体２０の通し穴２１ｂ、凹穴２１ｃ（隔離壁６８）、シール部材（環状部材）７５（の筒状部７５ｂ）、及びガイドブッシュ２６の下部には、前記弁軸２５における下部小径部２５ｃが通されている。 Further, in the example shown in FIG. 3, in order to avoid contact between the O-ring 69 and the valve shaft 25, the sliding resistance is reduced, and the O-ring 69 is prevented from being displaced in the concave hole 21c. A cylindrical isolation wall 68 is integrally projected from the inner end of the hole 21c (bottom surface 21cc), and is integrally formed with the valve body 20 between the O-ring 69 and the valve shaft 25. An isolation wall 68 is interposed. In this case, the lower small diameter portion 25c of the valve shaft 25 is formed long in the vertical direction, and the through hole 21b, the concave hole 21c (isolation wall 68), and the seal member (annular member) 75 (cylindrical shape) of the valve body 20 are formed. The lower small diameter portion 25c of the valve shaft 25 is passed through the lower portion 75b) and the lower portion of the guide bush 26.

前述した如くの図３に示されるシール部材７５を使用した場合でも、図１、２に示される電動弁１（のシール部材７０）と同様の作用効果が得られることは詳述するまでも無い。 It is needless to say that even when the seal member 75 shown in FIG. 3 as described above is used, the same action and effect as that of the motorized valve 1 (seal member 70) shown in FIGS. 1 and 2 can be obtained. ..

なお、上記実施形態では、弁口オリフィス２２が形成された弁座２９が弁本体２０と別部材として構成されているが、弁座２９を弁本体２０と一体に構成しても良いことは勿論である。また、弁軸２５や弁本体２０等の形状・構成等は適宜に変更できることは言うまでも無い。 In the above embodiment, the valve seat 29 on which the valve opening orifice 22 is formed is configured as a separate member from the valve body 20, but it goes without saying that the valve seat 29 may be integrally configured with the valve body 20. Is. Needless to say, the shape and configuration of the valve shaft 25, the valve body 20, and the like can be changed as appropriate.

また、上記実施形態では、流体が、弁本体における弁室の側部に連結された流体導入管から、弁室、及び弁座に形成された縦向きの弁口オリフィスを介して、弁室の下部に連結された流体導出管に流されるものとしたが、逆に、流体が、流体導出管から、弁口オリフィス、及び弁室を介して流体導入管に流される場合にも、上記と同様の作用効果が得られることは勿論である。 Further, in the above embodiment, the fluid flows from the fluid introduction pipe connected to the side portion of the valve chamber in the valve body through the valve chamber and the vertical valve opening orifice formed in the valve seat. It is assumed that the fluid flows through the fluid outlet pipe connected to the lower part, but conversely, when the fluid flows from the fluid outlet pipe to the fluid introduction pipe via the valve opening orifice and the valve chamber, the same applies to the above. Of course, the action and effect of

また、本発明は、様々なタイプの電動弁に採用し得ることは言うまでも無い。その一例としては、例えば、弁体が最下降位置にあるときに、弁体が弁座部に接当（着座）して流体の流れが遮断される閉弁タイプの電動弁、弁体が弁座部に接当（着座）しつつ、弁体に設けられた連通穴や弁座部に設けられたブリード溝等を介して所定量の通過流量が確保されるタイプの電動弁（いずれも弁体が弁座部に接離する電動弁）、弁体が最下降位置（通常なら全閉状態となる）にあるときに、弁体と弁座部との間に所定の大きさの間隙が形成されて所定量の通過流量が確保される閉弁レスタイプの電動弁（弁体が弁座部に近接離間する電動弁）などが挙げられる。 Needless to say, the present invention can be applied to various types of motorized valves. As an example, for example, when the valve body is in the lowest position, the valve body contacts (seats) the valve seat to block the flow of fluid, and the valve body is a valve. A type of motorized valve that secures a predetermined amount of passing flow through a communication hole provided in the valve body, a bleed groove provided in the valve seat, etc. while abutting (seating) to the seat (both valves). When the body is in the retracted position (normally fully closed), there is a gap of a predetermined size between the valve body and the valve seat. Examples thereof include a valve closing-less type electric valve (an electric valve in which the valve body is close to and separated from the valve seat portion) which is formed and secures a predetermined amount of passing flow rate.

また、上記実施形態では、ロータとステータとからなるステッピングモータ、ガイドブッシュと弁軸ホルダとの間のねじ送り機構等を利用した昇降駆動部によって、弁体を弁座部に対して昇降させる電動弁について説明したが、本発明は、通電のＯＮとＯＦＦとの切換えによってプランジャンを駆動させて弁体を弁座部に対して昇降させる電磁弁等の他の電気的駆動弁にも適用し得ることは言うまでも無い。 Further, in the above embodiment, the valve body is electrically moved up and down with respect to the valve seat portion by a stepping motor composed of a rotor and a stator, and an elevating drive portion using a screw feed mechanism between the guide bush and the valve shaft holder. Although the valve has been described, the present invention is also applied to other electrically driven valves such as a solenoid valve that drives a plunger by switching energization between ON and OFF to raise and lower the valve body with respect to the valve seat portion. Needless to say, you will get it.

１電動弁（電気的駆動弁）
２０弁本体
２１弁室
２１ａ天井部
２１ｂ通し穴
２１ｃ凹穴
２１ｄ嵌合穴
２２弁口オリフィス
２３鍔状部材
２４弁体
２５弁軸
２６ガイドブッシュ
２７下ストッパ体（固定ストッパ）
２８固定ねじ部（雄ねじ部）
２９弁座（弁座部材）
２９ａ弁座部
３０ねじ送り機構
３１ストッパ機構
３２弁軸ホルダ
３４圧縮コイルばね
３７上ストッパ体（移動ストッパ）
３８移動ねじ部（雌ねじ部）
４０キャン
５０ステッピングモータ
５５ステータ
５６ロータ
６１流体導入管
６２流体導出管
６８隔離壁
６９Ｏリング（弾性部材）
７０シール部材
７１Ｏリング
７２リング状部材
７５シール部材（環状部材）
７５ａ平板状部
７５ｂ筒状部 1 Electric valve (electric drive valve)
20 Valve body 21 Valve chamber 21a Ceiling part 21b Through hole 21c Concave hole 21d Fitting hole 22 Valve port orifice 23 collar-shaped member 24 Valve body 25 Valve shaft 26 Guide bush 27 Lower stopper body (fixed stopper)
28 Fixing screw part (male screw part)
29 Valve seat (valve seat member)
29a Valve seat 30 Screw feed mechanism 31 Stopper mechanism 32 Valve shaft holder 34 Compression coil spring 37 Upper stopper body (moving stopper)
38 Moving thread part (female thread part)
40 Can 50 Stepping motor 55 Stator 56 Rotor 61 Fluid introduction pipe 62 Fluid lead pipe 68 Isolation wall 69 O-ring (elastic member)
70 Seal member 71 O-ring 72 Ring-shaped member 75 Seal member (annular member)
75a Flat plate 75b Cylindrical part

Claims

弁体が設けられた弁軸と、前記弁体が接離又は近接離間する弁座部を有する弁口オリフィスが形成された弁座を備えるとともに、流体が導入導出される弁室が形成された弁本体と、前記弁本体に固定されたガイドブッシュに摺動自在に内挿された前記弁軸に設けられた前記弁体を電気的駆動力を利用して前記弁座部に対して昇降させるための昇降駆動部と、を備える電気的駆動弁であって、
前記弁室と前記昇降駆動部との間をシールするシール部材が、前記弁本体と前記ガイドブッシュとによって挟持されており、
前記弁本体における前記弁室の天井部に、前記弁軸が挿通される通し穴及び前記ガイドブッシュが固定される嵌合穴が設けられ、前記通し穴と前記嵌合穴との間に凹穴が設けられ、前記シール部材が、前記凹穴内で前記弁軸に外装されて配在されており、
前記シール部材は、内端が前記弁軸の外周に当接せしめられ、外端が前記ガイドブッシュと前記凹穴内に配置された弾性部材とで挟持された環状部材で構成されており、
前記弾性部材と前記弁軸との間に隔離壁が設けられていることを特徴とする電気的駆動弁。 A valve shaft provided with a valve body and a valve seat formed with a valve opening orifice having a valve seat portion in which the valve body is brought into contact with or close to each other are provided, and a valve chamber into which a fluid is introduced and derived is formed. The valve body and the valve body provided on the valve shaft slidably inserted in the guide bush fixed to the valve body are moved up and down with respect to the valve seat portion by using an electric driving force. It is an electric drive valve provided with an elevating drive unit for the purpose.
A sealing member that seals between the valve chamber and the elevating drive unit is sandwiched between the valve body and the guide bush .
A through hole through which the valve shaft is inserted and a fitting hole into which the guide bush is fixed are provided in the ceiling of the valve chamber in the valve body, and a concave hole is provided between the through hole and the fitting hole. Is provided, and the sealing member is arranged so as to be exteriorized from the valve shaft in the concave hole.
The seal member is composed of an annular member whose inner end is brought into contact with the outer periphery of the valve shaft and whose outer end is sandwiched between the guide bush and an elastic member arranged in the concave hole.
An electrically driven valve characterized in that an isolation wall is provided between the elastic member and the valve shaft .

前記環状部材は、前記ガイドブッシュと前記弾性部材との間に配置される平板状部と、該平板状部の内端から突設されて前記弁軸の外周に当接せしめられる筒状部とで構成されていることを特徴とする請求項１に記載の電気的駆動弁。 The annular member includes a flat plate-shaped portion arranged between the guide bush and the elastic member, and a tubular portion that protrudes from the inner end of the flat plate-shaped portion and is brought into contact with the outer periphery of the valve shaft. The electrically driven valve according to claim 1 , wherein the electrically driven valve is composed of.

前記隔離壁は前記弁本体と一体に成形されていることを特徴とする請求項１又は２に記載の電気的駆動弁。 The electrically driven valve according to claim 1 or 2 , wherein the isolation wall is integrally formed with the valve body.