JP6621789B2 - Motorized valve - Google Patents

Motorized valve Download PDF

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JP6621789B2
JP6621789B2 JP2017209358A JP2017209358A JP6621789B2 JP 6621789 B2 JP6621789 B2 JP 6621789B2 JP 2017209358 A JP2017209358 A JP 2017209358A JP 2017209358 A JP2017209358 A JP 2017209358A JP 6621789 B2 JP6621789 B2 JP 6621789B2
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valve
valve shaft
stopper
guide bush
shaft holder
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JP2019082206A (en
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吉田 竜也
竜也 吉田
将志 矢沢
将志 矢沢
友一 木内
友一 木内
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Fujikoki Corp
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Fujikoki Corp
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Description

本発明は、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て使用される電動弁に関する。   The present invention relates to an electric valve that is used as a flow control valve or the like in a refrigeration cycle such as an air conditioner or a refrigerator.

この種の電動弁として、例えば、下端部に弁体が設けられた弁軸と、該弁軸が軸線方向に相対移動可能及び相対回転可能な状態で内挿される円筒部を有するガイドブッシュと、前記弁体が接離する弁シート部(弁座)を有すると共に前記ガイドブッシュが取付固定された弁本体と、前記ガイドブッシュが内挿される円筒部と前記弁軸の上端部が挿通される挿通穴が貫設された天井部とを有すると共に、前記弁軸と連結固定される弁軸ホルダと、前記弁体を閉弁方向に付勢すべく前記弁軸と前記弁軸ホルダとの間に介装された付勢部材と、前記弁軸ホルダを前記ガイドブッシュに対して回転させるためのロータ及びステータを有するモータと、前記ガイドブッシュの外周に形成された固定ねじ部と前記弁軸ホルダの内周に形成された可動ねじ部とからなり、前記ロータの回転駆動に応じて前記弁軸の前記弁体を前記弁シート部(弁座)に対して昇降させるためのねじ送り機構と、前記弁軸ホルダの回転下動規制を行うべく、前記ガイドブッシュの前記固定ねじ部に螺着される雌ねじ部を持つ下部ストッパに設けられた固定ストッパ体と、前記弁軸ホルダに設けられた可動ストッパ体とからなる下部ストッパ機構と、を備え、前記弁体が最下降位置にあるときに、前記弁体と前記弁シート部(弁座)との間に所定の大きさの間隙が形成されているものが知られている(例えば、特許文献1参照)。   As this type of electric valve, for example, a valve shaft provided with a valve body at the lower end, and a guide bush having a cylindrical portion inserted in a state in which the valve shaft is relatively movable and relatively rotatable in the axial direction; A valve main body having a valve seat portion (valve seat) to which the valve body comes in contact with and separating from the valve body, and a guide portion to which the guide bush is attached, a cylindrical portion in which the guide bush is inserted, and an upper end portion of the valve shaft are inserted. A valve shaft holder coupled to and fixed to the valve shaft, and between the valve shaft and the valve shaft holder to bias the valve body in a valve closing direction. An interposed biasing member; a motor having a rotor and a stator for rotating the valve shaft holder with respect to the guide bush; a fixing screw portion formed on an outer periphery of the guide bush; and the valve shaft holder Movable screw formed on the inner circumference And a screw feed mechanism for raising and lowering the valve body of the valve shaft relative to the valve seat portion (valve seat) in accordance with the rotational drive of the rotor, and restricting the rotational downward movement of the valve shaft holder Accordingly, a fixed stopper body provided on a lower stopper having a female screw portion screwed to the fixed screw portion of the guide bush, and a lower stopper mechanism comprising a movable stopper body provided on the valve shaft holder, It is known that when the valve body is in the lowest lowered position, a gap of a predetermined size is formed between the valve body and the valve seat portion (valve seat) (for example, Patent Document 1).

前記した如くの閉弁レスタイプの電動弁を用いた空調機では、弁体が最下降位置(通常なら全閉状態となる)にあるときでも、弁座との間に所定の大きさの間隙が形成されるため、例えば、除湿運転を深夜に行う場合、電動弁を全閉状態にすることなく冷媒量を絞った状態で運転でき、電動弁のオン/オフによる作動音の発生を抑制することができる。また、前記した如くの電動弁では、通常の閉弁タイプの電動弁と比べて、弁座への弁体の喰いつきも確実に防止できるといった利点もある。   In the air conditioner using the valveless type motorized valve as described above, even when the valve body is in the lowest lowered position (normally in a fully closed state), a gap of a predetermined size is provided between the valve seat and the valve seat. For example, when the dehumidifying operation is performed at midnight, it can be operated with the amount of refrigerant reduced without fully closing the motor-operated valve, and the generation of operating noise due to on / off of the motor-operated valve is suppressed. be able to. In addition, the motor-operated valve as described above has an advantage that the bite of the valve body to the valve seat can be surely prevented as compared with a normal valve-closed motor-operated valve.

特開2016−217451号公報JP, 2006-217451, A

ところで、前記した如くの従来の電動弁では、前記弁体と弁座との間に所定の大きさの間隙を形成するため、ストッパ機構を構成する固定ストッパ体を持つ下部ストッパに係合して当該下部ストッパのガイドブッシュに対する相対回転を防止するストッパ押さえ(押さえ部材)を用いて、当該下部ストッパをガイドブッシュに対して回転不能に連結して位置決めする場合がある。   By the way, in the conventional motor-operated valve as described above, in order to form a gap of a predetermined size between the valve body and the valve seat, it is engaged with a lower stopper having a fixed stopper body constituting a stopper mechanism. In some cases, a stopper presser (pressing member) that prevents relative rotation of the lower stopper with respect to the guide bushing is used to position the lower stopper so that it cannot rotate with respect to the guide bushing.

例えば上記特許文献1に所載の従来の電動弁では、前記ストッパ押さえは、平板からなる円板状部材で作製されており、前記下部ストッパに外装されて係合せしめられるとともに、前記弁本体ないし当該弁本体にろう付け等により固定された鍔状板の上面に載置されて接合固定されている。そのため、例えば、前記ストッパ押さえが載置固定される弁本体や鍔状板の上面に付着するろう材による凹凸、弁本体や鍔状板の上面の平面度(面精度)のばらつき等によって、前記ストッパ押さえが弁本体や鍔状板に対して傾いて配置され、前記ストッパ押さえと弁本体や鍔状板との間に隙間が発生して、前記ストッパ押さえを精緻に固定できないおそれがあった。   For example, in the conventional motor-operated valve described in Patent Document 1, the stopper presser is made of a disk-shaped member made of a flat plate, and is externally engaged with and engaged with the lower stopper. It is mounted on the upper surface of a bowl-shaped plate fixed to the valve body by brazing or the like and fixedly bonded. Therefore, for example, due to unevenness due to brazing material adhering to the upper surface of the valve body or bowl plate on which the stopper presser is placed and fixed, variation in flatness (surface accuracy) of the upper surface of the valve body or bowl plate, etc. There is a possibility that the stopper presser is inclined with respect to the valve main body or the bowl-shaped plate, and a gap is generated between the stopper presser and the valve main body or the bowl-shaped plate, so that the stopper presser cannot be fixed precisely.

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、弁本体や鍔状板に対してストッパ押さえを精緻に配置固定することのできる電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 provide an electric valve capable of precisely arranging and fixing a stopper presser to a valve body or a bowl-shaped plate. is there.

上記する課題を解決するために、本発明に係る電動弁は、基本的に、弁体が設けられた弁軸と、該弁軸が軸線方向に相対移動可能及び相対回転可能に内挿されるガイドブッシュと、前記弁体が接離する弁座付きの弁口を有するとともに前記ガイドブッシュが取付固定された弁本体と、前記弁軸に連結される弁軸ホルダと、前記弁軸ホルダを前記ガイドブッシュに対して回転させるためのロータ及びステータを有するモータと、前記ロータの回転駆動に応じて前記弁軸の前記弁体を前記弁本体の前記弁座に対して昇降させるための、前記ガイドブッシュと前記弁軸ホルダとの間に設けられたねじ送り機構と、前記弁軸ホルダの回転下動規制を行うための、前記弁軸ホルダに設けられた可動ストッパ体及び前記ガイドブッシュに取り付けられた下部ストッパに設けられた固定ストッパ体を有する下部ストッパ機構と、前記下部ストッパの前記ガイドブッシュに対する相対移動を防止する押さえ部材と、を備え、前記押さえ部材は、前記下部ストッパに装着されるとともに、前記弁本体から離間して配置された外装支持部と、前記外装支持部の外周に設けられ、前記弁本体の外周に設けられた鍔状板定される取付固定部とを有し、前記外装支持部と前記取付固定部との間に段差部が設けられていることを特徴としている。 In order to solve the above-described problems, the motor-operated valve according to the present invention basically includes a valve shaft provided with a valve body, and a guide in which the valve shaft is relatively movable and relatively rotatable in the axial direction. A valve body having a valve opening with a valve seat to which the valve body comes in contact with and away from the valve body, and the guide bush is mounted and fixed; a valve shaft holder connected to the valve shaft; and the valve shaft holder which is connected to the guide bush. A motor having a rotor and a stator for rotating the valve body, and the guide bush for raising and lowering the valve body of the valve shaft relative to the valve seat of the valve body in accordance with the rotational drive of the rotor A screw feed mechanism provided between the valve shaft holder and a movable stopper body provided on the valve shaft holder and a lower portion attached to the guide bush for restricting the rotational movement of the valve shaft holder. A lower stopper mechanism having a fixed stopper body provided on the stopper, and a pressing member that prevents relative movement of the lower stopper with respect to the guide bush, wherein the pressing member is mounted on the lower stopper, and an exterior support portion which is spaced from the valve body, provided on an outer periphery of the outer support section, possess a fixing lug which is fixed to the flange-like plate provided on the outer periphery of the valve body, the the step portion is characterized that you have provided between the outer support portion and the fixing lug.

別の好ましい態様では、前記外装支持部に、前記下部ストッパが挿通される嵌挿穴が設けられるとともに、該嵌挿穴に隣接して前記下部ストッパを挟持する複数の支持爪が立設される。   In another preferred aspect, the exterior support portion is provided with a fitting insertion hole through which the lower stopper is inserted, and a plurality of support claws that sandwich the lower stopper are provided adjacent to the fitting insertion hole. .

別の好ましい態様では、前記弁本体における前記ガイドブッシュの外側に設けられた前記鍔状板に、前記押さえ部材の前記取付固定部が固定される。 In another preferred embodiment, the flange-like plate provided outside the guide bushing of the valve body, the fixing lug of the pressing member is fixed.

更に好ましい態様では、前記鍔状板の外周にキャンが接合される。   In a more preferred embodiment, a can is joined to the outer periphery of the bowl-shaped plate.

他の好ましい態様では、前記鍔状板における前記取付固定部と当接する部分より内側に環状凹溝が設けられる。 In another preferred embodiment, an annular groove is provided on the inner side of a portion of the bowl-shaped plate that comes into contact with the attachment fixing portion.

本発明によれば、前記押さえ部材において、下部ストッパに装着される外装支持部が弁本体から離間して配置され、外装支持部の外周に設けられた取付固定部が弁本体に設けられた鍔状板定され、外装支持部が弁本体とは当接しないので、例えば当該押さえ部材が平板からなる円板状部材で作製され、そのほぼ全面が弁本体と当接する従来の電動弁と比べて、前記押さえ部材が弁本体に対して傾くおそれがなく、弁本体に対して押さえ部材を精緻に配置固定することができる。 According to the present invention, in the pressing member, an exterior support portion mounted to the lower stopper is spaced from the valve body, fixing lug provided on the outer periphery of the outer support portion is provided on the valve body flange is fixed at Jo plate, since the outer support portion does not contact the valve body, for example, the pressing member is made of a disk-shaped member made of a flat plate, and its almost conventional electric valve which entirely abuts a valve body In comparison, there is no fear that the pressing member is inclined with respect to the valve body, and the pressing member can be precisely arranged and fixed with respect to the valve body.

また、例えば押さえ部材のほぼ全面が弁本体と当接する従来の電動弁と比べて、弁本体や鍔状板との当接面(取付固定部)が小さくて済み、固定部分の面精度(平面度)が確保しやすくなるため、これによっても、弁本体や鍔状板に対して押さえ部材を精緻に配置固定することができる。 In addition, for example, the contact surface (mounting fixing part) with the valve main body or the bowl-shaped plate is smaller than that of a conventional motorized valve in which almost the entire pressing member is in contact with the valve main body. This makes it possible to precisely arrange and fix the pressing member with respect to the valve main body and the bowl-shaped plate .

本発明に係る電動弁の一実施形態を示す縦断面図。The longitudinal cross-sectional view which shows one Embodiment of the motor operated valve which concerns on this invention. 図1に示される弁軸ホルダを示し、(A)は斜視図、(B)は上面図。The valve shaft holder shown by FIG. 1 is shown, (A) is a perspective view, (B) is a top view. 図1に示されるストッパ押さえを示し、(A)は斜視図、(B)は上面図。The stopper press shown by FIG. 1 is shown, (A) is a perspective view, (B) is a top view. 図1に示される電動弁の組立途中状態(ストッパ押さえを装着した状態)を示し、(A)は斜視図、(B)は上面図。The motor valve shown in FIG. 1 is in the middle of assembly (a state in which a stopper presser is attached), (A) is a perspective view, and (B) is a top view.

以下、本発明の実施形態を図面を参照しながら説明する。   Embodiments of the present invention will be described below with reference to the drawings.

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。   In each drawing, gaps formed between members, separation distances between members, etc. may be exaggerated for easy understanding of the invention and for convenience of drawing. is there. Further, in this specification, descriptions representing positions and directions such as up and down and left and right are based on the directional arrow display of FIG. 1 and do not indicate positions and directions in the actual use state.

図1は、本発明に係る電動弁の一実施形態を示す縦断面図である。   FIG. 1 is a longitudinal sectional view showing an embodiment of a motor-operated valve according to the present invention.

図示実施形態の電動弁1は、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て使用されるもので、主に、弁体14が設けられた弁軸10と、ガイドブッシュ20と、弁軸ホルダ30と、弁本体40と、キャン55と、ロータ51とステータ52とからなるステッピングモータ50と、圧縮コイルばね(付勢部材)60と、ストッパとしての固定部材70と、ねじ送り機構28と、下部ストッパ機構29とを備える。   The motor-driven valve 1 in the illustrated embodiment is used as a flow control valve or the like in a refrigeration cycle such as an air conditioner or a refrigerator, and mainly includes a valve shaft 10 provided with a valve body 14 and a guide. A bushing 20, a valve shaft holder 30, a valve body 40, a can 55, a stepping motor 50 comprising a rotor 51 and a stator 52, a compression coil spring (biasing member) 60, and a fixing member 70 as a stopper The screw feed mechanism 28 and the lower stopper mechanism 29 are provided.

前記弁軸10は、上側から、上部小径部11と、中間大径部12と、下部小径部13とを有し、その下部小径部13の下端部に、弁口46を流れる流体(冷媒)の通過流量を制御するための段付き逆円錐状の弁体14が一体的に形成されている。   The valve shaft 10 has an upper small diameter portion 11, an intermediate large diameter portion 12, and a lower small diameter portion 13 from above, and a fluid (refrigerant) that flows through the valve port 46 at the lower end portion of the lower small diameter portion 13. A stepped inverted conical valve body 14 for controlling the passage flow rate is integrally formed.

前記ガイドブッシュ20は、前記弁軸10(の中間大径部12)が軸線O方向に相対移動(摺動)可能及び軸線O回りに相対回転可能な状態で内挿される円筒部21と、該円筒部21の上端部から上方に延びており、該円筒部21よりも内径が大きく、前記弁軸10の中間大径部12の上端側と上部小径部11の下端側とが内挿される延設部22とを有している。前記ガイドブッシュ20の円筒部21の外周には、ロータ51の回転駆動に応じて前記弁軸10の弁体14を弁本体40の弁座46aに対して昇降させるねじ送り機構28の一方を構成する固定ねじ部(雄ねじ部)23が形成されている。また、前記円筒部21の下部(固定ねじ部23より下側の部分)は、大径とされ、弁本体40の嵌合穴44への嵌合部27とされる。前記固定ねじ部23(における弁軸ホルダ30より下側)には、下部ストッパ25が螺着されており、その下部ストッパ25の外周には、弁軸ホルダ30の回転下動規制を行う下部ストッパ機構29の一方を構成する固定ストッパ体24が一体的に突設されている。なお、本例では、嵌合部27の上面27aは、下部ストッパ25の下動規制を行う(言い換えれば、後述する着座状態における下部ストッパ25の位置を規定する)ストッパ部とされる。   The guide bush 20 includes a cylindrical portion 21 that is inserted in a state in which the valve shaft 10 (the intermediate large-diameter portion 12) is relatively movable (slidable) in the direction of the axis O and is relatively rotatable about the axis O, and The cylinder portion 21 extends upward from the upper end portion, has an inner diameter larger than the cylindrical portion 21, and is an extension in which the upper end side of the intermediate large diameter portion 12 of the valve shaft 10 and the lower end side of the upper small diameter portion 11 are inserted. And an installation part 22. On the outer periphery of the cylindrical portion 21 of the guide bush 20, one side of a screw feeding mechanism 28 that raises and lowers the valve body 14 of the valve shaft 10 with respect to the valve seat 46 a of the valve body 40 in accordance with the rotational drive of the rotor 51 is configured. A fixing screw portion (male screw portion) 23 is formed. Further, the lower portion of the cylindrical portion 21 (the portion below the fixing screw portion 23) has a large diameter and serves as a fitting portion 27 to the fitting hole 44 of the valve body 40. A lower stopper 25 is screwed to the fixing screw portion 23 (below the valve shaft holder 30), and a lower stopper that restricts the rotation of the valve shaft holder 30 from rotating on the outer periphery of the lower stopper 25. A fixed stopper body 24 constituting one side of the mechanism 29 is integrally projected. In this example, the upper surface 27a of the fitting portion 27 serves as a stopper portion that regulates the downward movement of the lower stopper 25 (in other words, defines the position of the lower stopper 25 in a seating state described later).

また、本例では、前記ガイドブッシュ20(の固定ねじ部23)に取着された下部ストッパ25に、ストッパ押さえ(押さえ部材)48が外装されており、当該ストッパ押さえ48によって下部ストッパ25がガイドブッシュ20(の固定ねじ部23)に対して回転不能に連結されている(後で詳述)。   In this example, a stopper presser (pressing member) 48 is externally mounted on the lower stopper 25 attached to the guide bush 20 (the fixing screw portion 23), and the lower stopper 25 is guided by the stopper presser 48. It is non-rotatably connected to the bush 20 (the fixing screw portion 23 thereof) (details will be described later).

前記弁軸ホルダ30は、例えば樹脂製(好ましくは、固定部材70との接触を考慮して、耐摩耗性の高いSUSや炭素繊維等で強化された樹脂製)とされ、前記ガイドブッシュ20が内挿される円筒部31と前記弁軸10(の上部小径部11)の上端部が(軸線O方向に相対移動可能及び軸線O回りに相対回転可能な状態で)挿通される挿通穴32aが貫設された天井部32とを有している。前記弁軸ホルダ30の円筒部31の内周下部には、前記ガイドブッシュ20の固定ねじ部23と螺合して前記ねじ送り機構28を構成する可動ねじ部(雌ねじ部)33が形成されるとともに、その円筒部31の内周上部は、前記ガイドブッシュ20の円筒状の延設部22の外周に当接(摺接)せしめられている。また、その円筒部31の外周下端には、前記下部ストッパ機構29の他方を構成する可動ストッパ体34が一体的に突設されている。   The valve shaft holder 30 is made of, for example, resin (preferably made of resin reinforced with high wear resistance SUS, carbon fiber, or the like in consideration of contact with the fixing member 70), and the guide bush 20 is An insertion hole 32a is inserted through which the cylindrical portion 31 to be inserted and the upper end portion of the valve shaft 10 (the upper small diameter portion 11 thereof) are inserted (with relative movement in the direction of the axis O and relative rotation about the axis O). And a ceiling part 32 provided. A movable screw portion (female screw portion) 33 that forms the screw feed mechanism 28 by screwing with the fixed screw portion 23 of the guide bush 20 is formed at the inner peripheral lower portion of the cylindrical portion 31 of the valve shaft holder 30. At the same time, the inner peripheral upper portion of the cylindrical portion 31 is brought into contact (sliding contact) with the outer periphery of the cylindrical extending portion 22 of the guide bush 20. A movable stopper body 34 constituting the other of the lower stopper mechanism 29 is integrally projected at the lower end of the outer periphery of the cylindrical portion 31.

また、前記弁軸ホルダ30の天井部32の上面(後述する固定部材70のフランジ部72との対向面)には、図1とともに図2を参照すればよくわかるように、平面視で(軸線O方向で視て)略扇形状(ここでは、中心角が約90度の扇形状)の2つの凸部35が一体に形成されている。詳しくは、前記2つの凸部35は、天井部32の上面における挿通穴32a周り(言い換えれば、弁軸ホルダ30の回転軸線O周り)で軸線Oに対して反対側に(言い換えれば、弁軸ホルダ30の回転軸線Oに対して対称となる位置に)上向きに突設されるとともに、その間(本例では、前記可動ストッパ体34の周方向の一端面34aの上方部分、つまり、軸線O方向で視たときに前記可動ストッパ体34の周方向の一端面34aと同じ位置を含む部分)が切り欠かれた形状を有している(平面視で略扇形状(ここでは、中心角が約90度の扇形状)の切欠き36)。   Further, the top surface of the ceiling portion 32 of the valve shaft holder 30 (the surface facing the flange portion 72 of the fixing member 70 described later) can be seen in a plan view (axis line) as can be understood by referring to FIG. 2 together with FIG. Two convex portions 35 having a substantially fan shape (here, a fan shape having a central angle of about 90 degrees) are integrally formed as viewed in the O direction. Specifically, the two convex portions 35 are disposed around the insertion hole 32a on the upper surface of the ceiling portion 32 (in other words, around the rotation axis O of the valve shaft holder 30) on the opposite side to the axis O (in other words, the valve shaft). While projecting upward (at a position symmetrical with respect to the rotation axis O of the holder 30), in the meantime (in this example, the upper portion of the circumferential end surface 34a of the movable stopper body 34, that is, the direction of the axis O) (The portion including the same position as the one end surface 34a in the circumferential direction of the movable stopper body 34) is cut out (substantially fan-shaped in plan view (here, the central angle is about 90 ° fan-shaped) notch 36).

前記の凸部35によって、固定部材70に対する弁軸ホルダ30の接触面積が減少するため、例えば、弁軸ホルダ30が固定部材70に当接するときの接触抵抗(回転摺動抵抗)が小さくなる。   Since the contact area of the valve shaft holder 30 with respect to the fixed member 70 is reduced by the convex portion 35, for example, the contact resistance (rotational sliding resistance) when the valve shaft holder 30 contacts the fixed member 70 is reduced.

また、例えば、前記弁軸ホルダ30が樹脂等の成形品で作製されている場合、成形時に形成されるウェルドラインやパーティングラインの位置と切欠き36の位置とを合わせる、すなわち、成形時にウェルドラインやパーティングラインが形成される箇所に切欠き36を設けることにより、前記接触抵抗(回転摺動抵抗)をさらに小さくできるとともに、前記弁軸ホルダ30の摺動面の平坦度が高くなり、弁軸10の軸ずれをさらに抑えることができる。   Further, for example, when the valve shaft holder 30 is made of a molded product such as resin, the position of the weld line or parting line formed at the time of molding is aligned with the position of the notch 36, that is, the weld line is molded at the time of molding. By providing the notch 36 at a location where a line or parting line is formed, the contact resistance (rotational sliding resistance) can be further reduced, and the flatness of the sliding surface of the valve shaft holder 30 is increased. The axial displacement of the valve shaft 10 can be further suppressed.

例えば、弁軸ホルダ30における可動ストッパ体34の逆側に成形用の樹脂を注入するためのゲートが設けられる場合、前述のように、可動ストッパ体34の上方(より具体的には、可動ストッパ体34の周方向の一端面34aの上方部分)に切欠き36を設けることにより、前記弁軸ホルダ30の凸部35には、成形時に形成されるウェルドラインやパーティングラインが存在しなくなるため、前記接触抵抗(回転摺動抵抗)をさらに小さくできるとともに、前記弁軸ホルダ30の摺動面の平坦度が高くなり、弁軸10の軸ずれをさらに抑えることができる。   For example, when a gate for injecting molding resin is provided on the opposite side of the movable stopper body 34 in the valve shaft holder 30, as described above, above the movable stopper body 34 (more specifically, the movable stopper body 34). By providing a notch 36 at the upper end portion 34a of the body 34 in the circumferential direction, there is no weld line or parting line formed on the convex portion 35 of the valve shaft holder 30 during molding. The contact resistance (rotational sliding resistance) can be further reduced, the flatness of the sliding surface of the valve shaft holder 30 can be increased, and the axial displacement of the valve shaft 10 can be further suppressed.

また、弁軸ホルダ30の天井部32の上面において前記凸部35を弁軸ホルダ30の回転軸線Oに対して対称に配置することで、弁軸10の軸ずれをより効果的に抑えられるとともに、前記凸部35を弁軸ホルダ30の回転軸線O周りの複数の箇所に分散して配置することで、固定部材70に対する弁軸ホルダ30(の凸部35)の接触面積をさらに減少させることが可能となる。   In addition, by disposing the convex portion 35 symmetrically with respect to the rotation axis O of the valve shaft holder 30 on the upper surface of the ceiling portion 32 of the valve shaft holder 30, the axial deviation of the valve shaft 10 can be more effectively suppressed. The contact area of the valve shaft holder 30 (the convex portion 35) with respect to the fixed member 70 is further reduced by disposing the convex portions 35 at a plurality of locations around the rotation axis O of the valve shaft holder 30. Is possible.

なお、前記弁軸ホルダ30の天井部32の上面に設けられる凸部35の形状、数、位置等は、図示例に限られないことは当然であるし、前記凸部35は省略してもよい。   It should be noted that the shape, number, position, and the like of the convex portions 35 provided on the upper surface of the ceiling portion 32 of the valve shaft holder 30 are not limited to the illustrated examples, and the convex portions 35 may be omitted. Good.

また、前記弁軸10の上部小径部11と中間大径部12との間に形成された段丘面(段差部)15と前記弁軸ホルダ30の天井部32の下面との間には、前記弁軸ホルダ30の天井部32の下面側に配置された円板状の押さえ板(ワッシャ)61を挟んで、弁軸10の上部小径部11に外挿されるように、前記弁軸10と前記弁軸ホルダ30とが昇降方向(軸線O方向)で離れる方向に付勢する、言い換えれば前記弁軸10(弁体14)を常時下方(閉弁方向)に付勢する円筒状の圧縮コイルばね(付勢部材)60が縮装されている。   Further, between the terrace surface (step part) 15 formed between the upper small diameter part 11 and the intermediate large diameter part 12 of the valve shaft 10 and the lower surface of the ceiling part 32 of the valve shaft holder 30, The valve shaft 10 and the valve shaft 10 are inserted into the upper small-diameter portion 11 of the valve shaft 10 with a disc-shaped pressing plate (washer) 61 disposed on the lower surface side of the ceiling portion 32 of the valve shaft holder 30 interposed therebetween. A cylindrical compression coil spring that biases the valve shaft holder 30 in a direction away from the valve shaft holder 30 in the up-and-down direction (axis O direction), in other words, constantly biases the valve shaft 10 (valve element 14) downward (valve closing direction). (Biasing member) 60 is shrunk.

前記弁本体40は、例えば真鍮やSUS等の金属製円筒体から構成されている。この弁本体40は、内部に流体が導入導出される弁室40aを有し、該弁室40aの側部に設けられた横向きの第1開口41に第1導管41aがろう付け等により連結固定され、該弁室40aの天井部に前記弁軸10(の中間大径部12)が軸線O方向に相対移動(摺動)可能及び軸線O回りに相対回転可能な状態で挿通される挿通穴43及び前記ガイドブッシュ20の下部(嵌合部27)が嵌合されて取付固定される嵌合穴44が形成され、該弁室40aの下部に設けられた縦向きの第2開口42に第2導管42aがろう付け等により連結固定されている。また、前記弁室40aと前記第2開口42との間の底部壁45に、前記弁体14が接離する弁座46aを有する段付きの弁口46が形成されている。   The said valve main body 40 is comprised from metal cylinders, such as brass and SUS, for example. The valve body 40 has a valve chamber 40a into which fluid is introduced and led, and a first conduit 41a is connected and fixed to a first lateral opening 41 provided on a side portion of the valve chamber 40a by brazing or the like. An insertion hole through which the valve shaft 10 (the intermediate large-diameter portion 12) can be relatively moved (slided) in the direction of the axis O and is relatively rotatable about the axis O is inserted into the ceiling of the valve chamber 40a. 43 and a lower portion (fitting portion 27) of the guide bush 20 are fitted and fixedly fitted, and a fitting hole 44 is formed, and a second vertical opening 42 provided in the lower portion of the valve chamber 40a Two conduits 42a are connected and fixed by brazing or the like. Further, a stepped valve port 46 having a valve seat 46a with which the valve body 14 contacts and separates is formed in the bottom wall 45 between the valve chamber 40a and the second opening 42.

前記弁本体40の上端部外周(弁本体40におけるガイドブッシュ20の外側)には円環状の鍔状板47がかしめ、ろう付け等により固着されるとともに、該鍔状板47の外周に設けられた段差部に、天井付き円筒状のキャン55の下端部が突き合わせ溶接等により密封接合されている。   An annular flange 47 is fixed to the outer periphery of the upper end of the valve body 40 (outside of the guide bush 20 in the valve body 40) by caulking, brazing or the like, and provided on the outer periphery of the flange 47. The lower end of a cylindrical can 55 with a ceiling is hermetically joined to the stepped portion by butt welding or the like.

また、本例では、前記鍔状板47の上面(キャン55側の表面)に、前記下部ストッパ25に係合して当該下部ストッパ25のガイドブッシュ20に対する相対回転を防止する段付きの概略円板状部材からなるストッパ押さえ(押さえ部材)48が配置固定されている。   In this example, the upper surface (surface on the can 55 side) of the bowl-shaped plate 47 is engaged with the lower stopper 25 to prevent relative rotation of the lower stopper 25 with respect to the guide bush 20. A stopper pressing (pressing member) 48 made of a plate-like member is arranged and fixed.

前記ストッパ押さえ48は、例えば真鍮やSUS等の金属部材からプレス加工等にて作製され、基本的に前記弁本体40(の上面)及び当該弁本体40に設けられた鍔状板47(の上面)から離間した(浮かされた)状態で前記下部ストッパ25に係合せしめられるとともに、その外周部分(環状の段差部48cより外側の部分)が、鍔状板47(の上面)に当接せしめられて溶接・溶着・接着等により接合固定されている。   The stopper presser 48 is made of, for example, a metal member such as brass or SUS by press working or the like, and basically the valve main body 40 (the upper surface thereof) and the bowl-shaped plate 47 (the upper surface of the valve main body 40). The outer peripheral portion (the portion outside the annular stepped portion 48c) is brought into contact with the upper surface of the bowl-shaped plate 47 (the upper surface thereof). Are fixed by welding, welding, bonding, etc.

詳しくは、図1とともに図3及び図4を参照すればよくわかるように、前記ストッパ押さえ48は、前記下部ストッパ25に外装されるとともに、前記弁本体40(の上面)から離間して配置された外装支持部48aと、段差部48cを介して外装支持部48aの外周に設けられ、前記弁本体40の外周に設けられた鍔状板47に取付固定される取付固定部48bとを有する。   Specifically, as can be understood by referring to FIG. 3 and FIG. 4 together with FIG. 1, the stopper presser 48 is mounted on the lower stopper 25 and is spaced apart from the upper surface of the valve body 40. And an attachment fixing portion 48b provided on the outer periphery of the outer support portion 48a via the stepped portion 48c and attached and fixed to the bowl-shaped plate 47 provided on the outer periphery of the valve body 40.

前記外装支持部48aには、前記下部ストッパ25が挿通される嵌挿穴48dが形成され、その嵌挿穴48dに隣接して(言い換えれば、嵌挿穴48dの外周部分に)、前記下部ストッパ25(の外面)を挟持する3つの支持爪49a、49b、49cが立設されている。この3つの支持爪49a、49b、49cは、前記下部ストッパ25の外表面に対向するように設けられるとともに、そのうちの相対的に小さい(周方向の幅及び高さが相対的に小さい)支持爪49cは、嵌挿穴48dにおける平面視扇形状の固定ストッパ体24が嵌挿される扇状部48eに隣接して(詳細には、扇状部48eに嵌挿される固定ストッパ体24の開弁方向側の側面に隣接して)配置されている。また、前記扇状部48eの外周部分(詳細には、扇状部48eに嵌挿される固定ストッパ体24の開弁方向側の側面とは反対側の側面に隣接する部分)には、固定ストッパ体24の外表面に対向するように支持爪49dが立設されており、この支持爪49dは、前記支持爪49cとともに固定ストッパ体24の周方向における両側面を挟持する。   The outer support 48a is formed with an insertion hole 48d through which the lower stopper 25 is inserted, and adjacent to the insertion hole 48d (in other words, at the outer peripheral portion of the insertion hole 48d), the lower stopper Three support claws 49a, 49b and 49c are provided upright to sandwich 25 (outer surface). The three support claws 49a, 49b, and 49c are provided so as to face the outer surface of the lower stopper 25, and among them, the support claws are relatively small (the circumferential width and height are relatively small). 49c is adjacent to the fan-shaped portion 48e into which the fan-shaped fixed stopper body 24 in the plan view is inserted in the insertion hole 48d (specifically, on the valve opening direction side of the fixed stopper body 24 inserted into the fan-shaped portion 48e). (Adjacent to the side). Further, the outer peripheral portion of the fan-shaped portion 48e (specifically, the portion adjacent to the side surface on the opposite side to the side surface on the valve opening direction side of the fixed stopper body 24 fitted and inserted into the fan-shaped portion 48e) is fixed stopper body 24. A support claw 49d is erected so as to face the outer surface of this, and the support claw 49d clamps both side surfaces of the fixed stopper body 24 in the circumferential direction together with the support claw 49c.

一方、前記取付固定部48bは、前記鍔状板47(の上面)の略中央部に溶接・溶着・接着等により接合固定されており(接合部K)、これにより、下部ストッパ25は、ガイドブッシュ20(の固定ねじ部23)に対して相対回転不能に連結される。   On the other hand, the attachment fixing portion 48b is joined and fixed to the substantially central portion of the flange-like plate 47 (the upper surface thereof) by welding, welding, adhesion, or the like (joining portion K). It is connected to the bush 20 (the fixing screw portion 23) so as not to rotate relative thereto.

また、前記鍔状板47の上面(詳しくは、前記取付固定部48bと当接する部分より内側)には、弁本体40に鍔状板47をろう付けする際のろう材の流れを防止するための環状凹溝47aが付設されている。   In addition, in order to prevent the brazing material from flowing when the flange-like plate 47 is brazed to the valve main body 40 on the upper surface of the flange-like plate 47 (specifically, inside the portion that contacts the mounting fixing portion 48b). The annular groove 47a is attached.

前記キャン55の内側かつ前記ガイドブッシュ20及び前記弁軸ホルダ30の外側には、ロータ51が回転自在に配在され、前記キャン55の外側に、前記ロータ51を回転駆動すべく、ヨーク52a、ボビン52b、ステータコイル52c、及び樹脂モールドカバー52d等からなるステータ52が配置されている。ステータコイル52cには、複数のリード端子52eが接続され、これらのリード端子52eには、基板52fを介して複数のリード線52gが接続され、ステータコイル52cへの通電励磁によってキャン55内に配在されたロータ51が軸線O回りで回転するようになっている。   A rotor 51 is rotatably disposed inside the can 55 and outside the guide bush 20 and the valve shaft holder 30. A yoke 52a, A stator 52 including a bobbin 52b, a stator coil 52c, a resin mold cover 52d, and the like is disposed. A plurality of lead terminals 52e are connected to the stator coil 52c, and a plurality of lead wires 52g are connected to these lead terminals 52e via a substrate 52f, and are arranged in the can 55 by energization excitation to the stator coil 52c. The existing rotor 51 rotates about the axis O.

キャン55内に配在された前記ロータ51は、前記弁軸ホルダ30に係合支持されており、当該弁軸ホルダ30は前記ロータ51とともに(一体に)回転するようになっている。   The rotor 51 disposed in the can 55 is engaged and supported by the valve shaft holder 30, and the valve shaft holder 30 rotates together with the rotor 51 (integrally).

詳細には、前記ロータ51は、内筒51a、外筒51b、及び内筒51aと外筒51bとを軸線O回りの所定の角度位置で接続する接続部51cからなる二重管構成とされ、内筒51aの内周に、(例えば、軸線O回りで120度の角度間隔で)軸線O方向(上下方向)に延びる縦溝51dが形成されている。   Specifically, the rotor 51 has a double pipe configuration including an inner cylinder 51a, an outer cylinder 51b, and a connection portion 51c that connects the inner cylinder 51a and the outer cylinder 51b at a predetermined angular position around the axis O. A longitudinal groove 51d extending in the direction of the axis O (vertical direction) is formed on the inner periphery of the inner cylinder 51a (for example, at an angular interval of 120 degrees around the axis O).

一方、前記弁軸ホルダ30の外周(の上半部分)には、図2を参照すればよくわかるように、その上端に円錐台面からなるテーパ面部30cが設けられ、そのテーパ面部30cの下側に、(例えば、軸線O回りで120度の角度間隔で)上下方向に延びる突条30aが突設され、その突条30aの下部両側には、前記ロータ51を支持する上向きの係止面30bが形成されている。   On the other hand, the outer periphery (upper half portion) of the valve shaft holder 30 is provided with a tapered surface portion 30c made of a truncated cone surface at the upper end thereof, as can be understood with reference to FIG. 2, and the lower side of the tapered surface portion 30c. In addition, protrusions 30a extending in the vertical direction are provided (for example, at an angular interval of 120 degrees around the axis O), and upward locking surfaces 30b for supporting the rotor 51 are provided on both lower sides of the protrusions 30a. Is formed.

このように、ロータ51の内筒51aの縦溝51dと弁軸ホルダ30の突条30aとが係合し、かつロータ51の内筒51aの下面と弁軸ホルダ30の係止面30bとが当接することにより、ロータ51が弁軸ホルダ30に対して位置合わせされた状態でその外周に支持固定され、前記弁軸ホルダ30は、前記ロータ51を前記キャン55内で支持しながら当該ロータ51とともに回転される。   In this way, the vertical groove 51d of the inner cylinder 51a of the rotor 51 and the protrusion 30a of the valve shaft holder 30 are engaged, and the lower surface of the inner cylinder 51a of the rotor 51 and the locking surface 30b of the valve shaft holder 30 are engaged. By abutting, the rotor 51 is supported and fixed on the outer periphery of the rotor 51 while being aligned with the valve shaft holder 30, and the valve shaft holder 30 supports the rotor 51 in the can 55 while supporting the rotor 51. Rotated with.

なお、本例では、弁軸ホルダ30の上面がロータ51の内筒51aの上面と面一あるいはそれより若干上側に位置するように、前記ロータ51が前記弁軸ホルダ30に係合支持されている。   In this example, the rotor 51 is engaged and supported by the valve shaft holder 30 so that the upper surface of the valve shaft holder 30 is positioned flush with or slightly above the upper surface of the inner cylinder 51a of the rotor 51. Yes.

前記ロータ51及び弁軸ホルダ30の上側には、弁軸ホルダ30とロータ51との昇降方向における相対移動を防止する(言い換えれば、弁軸ホルダ30に対してロータ51を下方に押し付けて抜け止め係止する)とともに弁軸10と弁軸ホルダ30とを連結すべく、前記弁軸10(の上部小径部11)の上端部に外嵌固定された固定部材70が配在されている。   On the upper side of the rotor 51 and the valve shaft holder 30, relative movement in the ascending / descending direction of the valve shaft holder 30 and the rotor 51 is prevented (in other words, the rotor 51 is pressed downward against the valve shaft holder 30 to prevent it from coming off). In order to connect the valve shaft 10 and the valve shaft holder 30 together, a fixing member 70 that is externally fitted and fixed to the upper end portion of the valve shaft 10 (the upper small diameter portion 11 thereof) is disposed.

前記固定部材70は、例えば真鍮やSUS等の金属部材からプレス加工、切削加工等にて作製され、前記弁軸10(の上部小径部11)の上端部に外嵌されて圧入、溶接、溶着、接着等により接合固定された小径上部71aと大径下部71bとからなる段付き円筒状の固定部71と、該固定部71(の大径下部71b)の下端部からロータ51の内筒51a付近まで外向きに延びる円板状のフランジ部72とを有する。   The fixing member 70 is made of, for example, a metal member such as brass or SUS by pressing, cutting, or the like, and is externally fitted to the upper end portion of the valve shaft 10 (the upper small-diameter portion 11 thereof) so as to be press-fitted, welded, and welded. , A stepped cylindrical fixing portion 71 composed of a small-diameter upper portion 71a and a large-diameter lower portion 71b that are bonded and fixed together by bonding or the like, and an inner cylinder 51a of the rotor 51 from the lower end portion of the fixing portion 71 (large-diameter lower portion 71b). And a disk-like flange portion 72 extending outward to the vicinity.

前記フランジ部72の下面は、前記弁軸ホルダ30の上面及びロータ51(の内筒51a)の上面に対向せしめられるとともに、その弁軸ホルダ30の上面に設けられた凸部35(の上面)及びロータ51(の内筒51aの上面)に対接せしめられるようになっている。   The lower surface of the flange portion 72 is opposed to the upper surface of the valve shaft holder 30 and the upper surface of the rotor 51 (the inner cylinder 51a), and the convex portion 35 (the upper surface thereof) provided on the upper surface of the valve shaft holder 30. And the rotor 51 (the upper surface of the inner cylinder 51a).

前記したように、前記ロータ51は、圧縮コイルばね60の付勢力により上方に付勢される弁軸ホルダ30と前記固定部材70(のフランジ部72の外周部分)の間で挟持されて抜け止め係止される。   As described above, the rotor 51 is clamped between the valve shaft holder 30 urged upward by the urging force of the compression coil spring 60 and the fixing member 70 (the outer peripheral portion of the flange portion 72 thereof) to prevent the rotor 51 from coming off. Locked.

また、前記弁軸10の上端部に固定された前記固定部材70(における固定部71の大径下部71b)には、動作時にガイドブッシュ20に対して弁軸ホルダ30が上方に移動し過ぎて、ガイドブッシュ20の固定ねじ部23と弁軸ホルダ30の可動ねじ部33との螺合が外れるのを防止すべく、弁軸ホルダ30をガイドブッシュ20側に付勢するコイルばねからなる復帰ばね75が外装されている。   In addition, the valve shaft holder 30 moves too much upward with respect to the guide bush 20 during the operation of the fixing member 70 (the large diameter lower portion 71b of the fixing portion 71) fixed to the upper end portion of the valve shaft 10. In order to prevent the fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30 from being disengaged, a return spring comprising a coil spring that biases the valve shaft holder 30 toward the guide bush 20 side. 75 is packaged.

そして、当該電動弁1では、例えば弁座46aへの弁体14の喰いつきを防止するとともに、低流量域での制御性を確保すべく、弁体14が最下降位置(原点位置)にあるときに、弁体14と弁座46aとの間に所定の大きさの間隙が形成されるようになっている。   In the motor-operated valve 1, for example, the valve body 14 is at the lowest lowered position (origin position) in order to prevent the valve body 14 from biting into the valve seat 46a and to ensure controllability in a low flow rate region. Sometimes, a gap of a predetermined size is formed between the valve body 14 and the valve seat 46a.

この電動弁1の組立工程、特に、弁体14の原点位置(最下降位置)出し工程を詳説すると、まず、弁軸10、ガイドブッシュ20、下部ストッパ25、圧縮コイルばね60、弁軸ホルダ30、ロータ51、弁本体40、鍔状板47等を組み付ける。例えば、弁本体40に鍔状板47をろう付けし、弁本体40にガイドブッシュ20を圧入固定した後に、ガイドブッシュ20(の固定ねじ部23)に下部ストッパ25を螺着する等してそれらを組み付ける。このとき、下部ストッパ25は、ガイドブッシュ20に対して相対回転可能に螺合させておく。なお、下部ストッパ25は、この段階で、ガイドブッシュ20のストッパ部27aと当接させて配置してもよいし、そのストッパ部27aと間隔をあけて配置してもよい。次いで、弁軸10の下端部に設けられた弁体14が弁座46aに接当(着座)し、圧縮コイルばね60が若干圧縮され、弁軸ホルダ30の可動ストッパ体34と下部ストッパ25の固定ストッパ体24とが当接し、かつ、下部ストッパ25(の下面)がガイドブッシュ20のストッパ部27aと当接するまで、ガイドブッシュ20の固定ねじ部23と弁軸ホルダ30の可動ねじ部33とからなるねじ送り機構28を利用して、前記弁軸ホルダ30、ロータ51、及び弁軸10を回転させながら下降させる。そして、このように弁軸ホルダ30が最下降位置に配置された状態で、弁軸10の上端部に固定部材70を圧入、溶接、溶着、接着等により外嵌固定する(着座状態)。   The assembly process of the motor-operated valve 1, particularly the origin position (lowermost position) of the valve body 14, will be described in detail. First, the valve shaft 10, guide bush 20, lower stopper 25, compression coil spring 60, valve shaft holder 30. Then, the rotor 51, the valve main body 40, the bowl-shaped plate 47, and the like are assembled. For example, the flange 47 is brazed to the valve body 40, the guide bush 20 is press-fitted and fixed to the valve body 40, and then the lower stopper 25 is screwed to the guide bush 20 (the fixing screw portion 23). Assemble. At this time, the lower stopper 25 is screwed to the guide bush 20 so as to be relatively rotatable. At this stage, the lower stopper 25 may be disposed in contact with the stopper portion 27a of the guide bush 20 or may be disposed at a distance from the stopper portion 27a. Next, the valve body 14 provided at the lower end of the valve shaft 10 contacts (seats) the valve seat 46a, the compression coil spring 60 is slightly compressed, and the movable stopper body 34 and the lower stopper 25 of the valve shaft holder 30 are compressed. The fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30 are in contact with the fixed stopper body 24 and until the lower stopper 25 (the lower surface thereof) is in contact with the stopper portion 27a of the guide bush 20. The valve shaft holder 30, the rotor 51, and the valve shaft 10 are lowered while rotating using the screw feed mechanism 28 composed of Then, with the valve shaft holder 30 placed in the lowest position as described above, the fixing member 70 is fitted and fixed to the upper end portion of the valve shaft 10 by press fitting, welding, welding, adhesion, or the like (sitting state).

次に、上記着座状態から、弁軸10、弁軸ホルダ30、ロータ51、固定部材70等が一体とされた組立体を、前記ねじ送り機構28を利用して回転させながら上昇させてガイドブッシュ20から取り外した後、ストッパ押さえ48を上から落し込むようにして下部ストッパ25に外装しつつ弁本体40及び鍔状板47上に載置し、下部ストッパ25をストッパ押さえ48とともにガイドブッシュ20に対して開弁方向(例えば、平面視で反時計回り)に所定回転角度だけ回転させる。そして、ストッパ押さえ48(の取付固定部48b)を弁本体40の鍔状板47に溶接・溶着・接着等により接合固定して、下部ストッパ25を、ガイドブッシュ20(の固定ねじ部23)に相対回転不能に連結固定した後(図4(A)、(B)参照)、再びねじ送り機構28を利用して前記組立体をガイドブッシュ20に組み付ける。これにより、下部ストッパ25の固定ストッパ体24のガイドブッシュ20に対する位置が変わるので、弁軸ホルダ30の可動ストッパ体34と下部ストッパ25の固定ストッパ体24とが当接して、弁軸ホルダ30が最下降位置にあるときでも、弁体14と弁座46aとの間に所定の大きさの間隙が形成される。   Next, from the seated state, an assembly in which the valve shaft 10, the valve shaft holder 30, the rotor 51, the fixing member 70, etc. are integrated is lifted while being rotated using the screw feed mechanism 28 to guide the bushing. After removing from the stopper 20, the stopper holder 48 is placed on the valve body 40 and the bowl-like plate 47 while being covered with the lower stopper 25 so as to drop from above, and the lower stopper 25 is mounted on the guide bush 20 together with the stopper holder 48. The valve is rotated by a predetermined rotation angle in the valve opening direction (for example, counterclockwise in plan view). Then, the stopper presser 48 (the mounting fixing portion 48b) is joined and fixed to the flange plate 47 of the valve body 40 by welding, welding, adhesion, or the like, and the lower stopper 25 is fixed to the guide bush 20 (the fixing screw portion 23). After being connected and fixed so as not to rotate relative to each other (see FIGS. 4A and 4B), the assembly is assembled to the guide bush 20 by using the screw feed mechanism 28 again. As a result, the position of the lower stopper 25 relative to the guide bush 20 of the fixed stopper body 24 changes, so that the movable stopper body 34 of the valve shaft holder 30 and the fixed stopper body 24 of the lower stopper 25 come into contact with each other. Even when in the lowest position, a gap of a predetermined size is formed between the valve body 14 and the valve seat 46a.

なお、ストッパ押さえ48を下部ストッパ25に装着する前に、下部ストッパ25をガイドブッシュ20に対して開弁方向に所定回転角度だけ回転させ、その後、ストッパ押さえ48を下部ストッパ25に外装して弁本体40の鍔状板47に接合固定してもよい。   Before attaching the stopper presser 48 to the lower stopper 25, the lower stopper 25 is rotated by a predetermined rotation angle in the valve opening direction with respect to the guide bush 20, and then the stopper presser 48 is externally attached to the lower stopper 25 to provide a valve. It may be bonded and fixed to the bowl-shaped plate 47 of the main body 40.

かかる構成の電動弁1では、ステータ52(のステータコイル52c)への通電励磁によってロータ51が回転せしめられると、それと一体に弁軸ホルダ30及び弁軸10が回転せしめられる。このとき、ガイドブッシュ20の固定ねじ部23と弁軸ホルダ30の可動ねじ部33とからなるねじ送り機構28により、弁軸10が弁体14を伴って昇降せしめられ、これによって、弁体14と弁座46aとの間の間隙(リフト量、弁開度)が増減されて、冷媒等の流体の通過流量が調整される。また、弁軸ホルダ30の可動ストッパ体34とガイドブッシュ20に固定された下部ストッパ25の固定ストッパ体24とが当接し、弁体14が最下降位置にあるときでも、弁体14と弁座46aとの間に間隙が形成されるため、所定量の通過流量が確保される。   In the motor-operated valve 1 having such a configuration, when the rotor 51 is rotated by energizing and exciting the stator 52 (the stator coil 52c), the valve shaft holder 30 and the valve shaft 10 are rotated integrally therewith. At this time, the valve shaft 10 is moved up and down with the valve body 14 by the screw feeding mechanism 28 composed of the fixed screw portion 23 of the guide bush 20 and the movable screw portion 33 of the valve shaft holder 30, thereby the valve body 14. Between the valve seat 46a and the valve seat 46a is increased or decreased to adjust the passage flow rate of the fluid such as the refrigerant. Even when the movable stopper body 34 of the valve shaft holder 30 and the fixed stopper body 24 of the lower stopper 25 fixed to the guide bush 20 are in contact with each other and the valve body 14 is in the lowest position, the valve body 14 and the valve seat Since a gap is formed with respect to 46a, a predetermined amount of passage flow rate is secured.

このように、本実施形態の電動弁1では、前記ストッパ押さえ48において、下部ストッパ25に装着される外装支持部48aが弁本体40から離間して配置され、外装支持部48aの外周に設けられた取付固定部48bが弁本体40に固着された鍔状板47に取付固定され、外装支持部48aが弁本体40とは当接しないので、例えば当該押さえ部材が平板からなる円板状部材で作製され、そのほぼ全面が弁本体と当接する従来の電動弁と比べて、前記ストッパ押さえ48が弁本体40に対して傾くおそれがなく、弁本体40や鍔状板47に対してストッパ押さえ48を精緻に配置固定することができる。   As described above, in the motor-operated valve 1 of the present embodiment, in the stopper presser 48, the exterior support portion 48a attached to the lower stopper 25 is disposed away from the valve body 40 and provided on the outer periphery of the exterior support portion 48a. Since the attachment fixing portion 48b is attached and fixed to the flange 47 fixed to the valve main body 40, and the exterior support portion 48a does not contact the valve main body 40, for example, the pressing member is a disk-shaped member made of a flat plate. Compared to a conventional motorized valve that is manufactured and almost entirely in contact with the valve body, the stopper presser 48 is not likely to tilt with respect to the valve main body 40, and the stopper presser 48 against the valve main body 40 and the bowl-shaped plate 47. Can be precisely arranged and fixed.

また、例えば押さえ部材のほぼ全面が弁本体と当接する従来の電動弁と比べて、弁本体40や鍔状板47との当接面(取付固定部48b)が小さくて済み、固定部分の面精度(平面度)が確保しやすくなるため、これによっても、弁本体40や鍔状板47に対してストッパ押さえ48を精緻に配置固定することができる。   Further, for example, the contact surface (mounting fixing portion 48b) with the valve main body 40 or the bowl-shaped plate 47 can be made smaller compared to a conventional motorized valve in which almost the entire pressing member is in contact with the valve main body. Since it becomes easy to ensure accuracy (flatness), the stopper presser 48 can be precisely arranged and fixed to the valve main body 40 and the bowl-shaped plate 47.

なお、上記実施形態では、弁体14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14と弁座46aとの間に所定の大きさの間隙が形成される(すなわち、弁体14が弁座46aに着座しない)閉弁レスタイプの電動弁について説明したが、例えば、弁体が弁座に着座するタイプの電動弁(例えば、特開2011−208716号公報等参照)において、前記と同様のストッパ押さえ(押さえ部材)を用いて下部ストッパをガイドブッシュ(の固定ねじ部)に対して相対回転不能に連結する場合にも、前記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。   In the above-described embodiment, when the valve body 14 is in the lowest lowered position (normally in a fully closed state), a gap of a predetermined size is formed between the valve body 14 and the valve seat 46a ( That is, the valve-less motorized valve in which the valve body 14 is not seated on the valve seat 46a has been described. For example, a motor-operated valve in which the valve body is seated on the valve seat (for example, Japanese Patent Application Laid-Open No. 2011-208716) In the case of connecting the lower stopper to the guide bush (fixing screw portion thereof) in a relatively non-rotatable manner using the same stopper pressing (pressing member) as described above, the same effect as described above can be obtained. There is no need to elaborate.

1 電動弁
10 弁軸
14 弁体
20 ガイドブッシュ
21 円筒部
23 固定ねじ部(雄ねじ部)
24 固定ストッパ体
25 下部ストッパ
28 ねじ送り機構
29 下部ストッパ機構
30 弁軸ホルダ
31 円筒部
32 天井部
33 可動ねじ部(雌ねじ部)
34 可動ストッパ体
35 凸部
40 弁本体
40a 弁室
41 第1開口
41a 第1導管
42 第2開口
42a 第2導管
43 挿通穴
44 嵌合穴
45 底部壁
46 弁口
46a 弁座
47 鍔状板
47a 環状凹溝
48 ストッパ押さえ(押さえ部材)
48a 外装支持部
48b 取付固定部
48c 段差部
50 ステッピングモータ
51 ロータ
52 ステータ
55 キャン
60 圧縮コイルばね
70 固定部材
71 固定部
71a 小径上部
71b 大径下部
72 フランジ部
O 軸線
DESCRIPTION OF SYMBOLS 1 Motorized valve 10 Valve stem 14 Valve body 20 Guide bush 21 Cylindrical part 23 Fixing screw part (male screw part)
24 fixed stopper body 25 lower stopper 28 screw feed mechanism 29 lower stopper mechanism 30 valve shaft holder 31 cylindrical portion 32 ceiling portion 33 movable screw portion (female screw portion)
34 Movable stopper body 35 Convex portion 40 Valve body 40a Valve chamber 41 First opening 41a First conduit 42 Second opening 42a Second conduit 43 Insertion hole 44 Fitting hole 45 Bottom wall 46 Valve port 46a Valve seat 47 Gutter-like plate 47a Annular groove 48 Stopper presser (pressing member)
48a Exterior support portion 48b Attachment fixing portion 48c Step portion 50 Stepping motor 51 Rotor 52 Stator 55 Can 60 Compression coil spring 70 Fixing member 71 Fixing portion 71a Small diameter upper portion 71b Large diameter lower portion 72 Flange portion O Axis line

Claims (5)

弁体が設けられた弁軸と、
該弁軸が軸線方向に相対移動可能及び相対回転可能に内挿されるガイドブッシュと、
前記弁体が接離する弁座付きの弁口を有するとともに前記ガイドブッシュが取付固定された弁本体と、
前記弁軸に連結される弁軸ホルダと、
前記弁軸ホルダを前記ガイドブッシュに対して回転させるためのロータ及びステータを有するモータと、
前記ロータの回転駆動に応じて前記弁軸の前記弁体を前記弁本体の前記弁座に対して昇降させるための、前記ガイドブッシュと前記弁軸ホルダとの間に設けられたねじ送り機構と、
前記弁軸ホルダの回転下動規制を行うための、前記弁軸ホルダに設けられた可動ストッパ体及び前記ガイドブッシュに取り付けられた下部ストッパに設けられた固定ストッパ体を有する下部ストッパ機構と、
前記下部ストッパの前記ガイドブッシュに対する相対移動を防止する押さえ部材と、を備える電動弁であって、
前記押さえ部材は、前記下部ストッパに装着されるとともに、前記弁本体から離間して配置された外装支持部と、前記外装支持部の外周に設けられ、前記弁本体の外周に設けられた鍔状板定される取付固定部とを有し、前記外装支持部と前記取付固定部との間に段差部が設けられていることを特徴とする電動弁。
A valve shaft provided with a valve body;
A guide bush in which the valve shaft is inserted so as to be relatively movable and relatively rotatable in the axial direction;
A valve body having a valve seat with a valve seat to which the valve body comes in contact with and away from the valve body, and the guide bush is mounted and fixed;
A valve shaft holder coupled to the valve shaft;
A motor having a rotor and a stator for rotating the valve shaft holder with respect to the guide bush;
A screw feed mechanism provided between the guide bush and the valve shaft holder for raising and lowering the valve body of the valve shaft relative to the valve seat of the valve body in accordance with the rotational drive of the rotor; ,
A lower stopper mechanism having a movable stopper body provided in the valve shaft holder and a fixed stopper body provided in a lower stopper attached to the guide bush for restricting the rotational movement of the valve shaft holder;
A pressing member that prevents relative movement of the lower stopper with respect to the guide bush, and an electric valve comprising:
The pressing member is mounted on the lower stopper, and is provided on the outer periphery of the outer body support portion and the outer periphery of the outer surface of the valve body , and is provided on the outer periphery of the outer body support portion. possess a fixing lug which is fixed to the plate, an electric valve, characterized that you have stepped portion is provided between the outer support portions and the fixing lug.
前記外装支持部に、前記下部ストッパが挿通される嵌挿穴が設けられるとともに、該嵌挿穴に隣接して前記下部ストッパを挟持する複数の支持爪が立設されていることを特徴とする請求項に記載の電動弁。 The exterior support portion is provided with a fitting insertion hole through which the lower stopper is inserted, and a plurality of supporting claws that sandwich the lower stopper are provided upright adjacent to the fitting insertion hole. The motor-operated valve according to claim 1 . 前記弁本体における前記ガイドブッシュの外側に設けられた前記鍔状板に、前記押さえ部材の前記取付固定部が固定されていることを特徴とする請求項1又は2に記載の電動弁。 Wherein the flange-like plate which is provided outside the guide bush, the electric valve according to claim 1 or 2, wherein the fixing lug of the retainer member is characterized in that it is fixed in the valve body. 前記鍔状板の外周にキャンが接合されていることを特徴とする請求項1から3のいずれか一項に記載の電動弁。 The motor-operated valve according to any one of claims 1 to 3, wherein a can is joined to an outer periphery of the bowl-shaped plate. 前記鍔状板における前記取付固定部と当接する部分より内側に環状凹溝が設けられていることを特徴とする請求項1からのいずれか一項に記載の電動弁。 The motor-operated valve according to any one of claims 1 to 4 , wherein an annular groove is provided on an inner side of a portion of the bowl-shaped plate that comes into contact with the mounting fixing portion.
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CN1987167B (en) * 2005-12-23 2010-09-29 株式会社不二工机 Electric valve
JP2008032093A (en) * 2006-07-27 2008-02-14 Saginomiya Seisakusho Inc Method of assembling electric control valve
JP5119358B2 (en) * 2011-12-12 2013-01-16 株式会社不二工機 Motorized valve and position setting method of fixed stopper piece in motorized valve
JP6412443B2 (en) * 2015-02-24 2018-10-24 株式会社不二工機 Motorized valve
JP6501609B2 (en) * 2015-05-20 2019-04-17 株式会社不二工機 Motor-operated valve and method of assembling the same

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