JP2016023709A - Motor valve - Google Patents

Motor valve Download PDF

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JP2016023709A
JP2016023709A JP2014147982A JP2014147982A JP2016023709A JP 2016023709 A JP2016023709 A JP 2016023709A JP 2014147982 A JP2014147982 A JP 2014147982A JP 2014147982 A JP2014147982 A JP 2014147982A JP 2016023709 A JP2016023709 A JP 2016023709A
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valve
valve shaft
holder
shaft holder
forming member
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JP6214487B2 (en
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大樹 中川
Daiki Nakagawa
大樹 中川
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Saginomiya Seisakusho Inc
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Saginomiya Seisakusho Inc
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Priority to JP2014147982A priority Critical patent/JP6214487B2/en
Priority to CN201510411828.0A priority patent/CN105276200B/en
Priority to CN201810885527.5A priority patent/CN108953620B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a motor valve capable of holding a vertically movable valve body always in stable position in abutment against a valve seat.SOLUTION: A motor valve comprises: a valve stem holder 6 fixed relatively irrotatably with respect to a valve chamber forming member 70 and formed with a female screw part 6d on the inner circumference of its cylindrical part 6a; a valve stem 4 mounted in the valve stem holder, rotating integrally with a rotor 2, and formed with a male screw part 4a on the outer circumference part, for moving a valve body 32 disposed therebelow vertically with respect to a valve seat part 21 thereby to open and close the valve; and a screw feeding mechanism A composed of the female screw part and the male screw part. The valve stem holder is equipped on the lower end part side of the inner circumference of the cylindrical part with a bearing part 6e for guiding a stem part 4b of the valve stem. Moreover, the motor valve is characterized: in that the internal diameter D1 of the female screw part of the valve stem holder is set smaller than the internal diameter D2 of the bearing part; and in that the threading length of the screw feeding mechanism A is constant, when the valve stem moves downward or upward.SELECTED DRAWING: Figure 1

Description

本発明は、冷凍サイクル等の冷媒流量を制御するステッピングモータ駆動型の電動弁に関する。   The present invention relates to an electric valve driven by a stepping motor that controls a flow rate of a refrigerant such as a refrigeration cycle.

可変絞り弁や流量制御弁などとして使用されるステッピングモータ駆動型の電動弁では、電動モータのロータの回転運動を雌ネジと雄ネジとから構成されるネジ送り機構によって弁軸の直線運動に変換し、弁軸の下方に配置された弁体を弁座に対して移動させることにより弁の開閉を行っている。   In stepping motor drive type electric valves used as variable throttle valves, flow control valves, etc., the rotational movement of the rotor of the electric motor is converted into linear movement of the valve shaft by a screw feed mechanism consisting of female and male screws. The valve is opened and closed by moving a valve element disposed below the valve shaft with respect to the valve seat.

図３はこのような従来の電動弁１０Ａを示したものである。
この電動弁１０Ａでは、弁軸６３の外周に形成された雄ネジ部２９（可動ネジ部）と、弁軸ホルダ８６の内周に形成された雌ネジ部２８（固定ネジ部）とにより弁軸６３に対するネジ送り機構１６が構成されている。 FIG. 3 shows such a conventional motor-operated valve 10A.
In this electric valve 10A, a valve shaft is formed by a male screw portion 29 (movable screw portion) formed on the outer periphery of the valve shaft 63 and a female screw portion 28 (fixed screw portion) formed on the inner periphery of the valve shaft holder 86. A screw feed mechanism 16 for 63 is configured.

そして、この電動弁１０Ａでは、ロータ３０の回転運動をネジ送り機構１６によって弁軸６３の直線運動に変換し、この直線運動により弁軸６３の下方に配置された弁体６１を弁座７２ｂに対して接離させ、これにより、冷媒等の流体の流量を調整するようにしている。   In the motor-operated valve 10A, the rotational movement of the rotor 30 is converted into a linear movement of the valve shaft 63 by the screw feed mechanism 16, and the valve body 61 disposed below the valve shaft 63 is moved to the valve seat 72b by the linear movement. It is made to contact / separate with respect to this, and this adjusts the flow volume of fluids, such as a refrigerant | coolant.

ところで、このような電動弁１０Ａでは、弁軸ホルダ８６の雌ネジ部２８が形成された部分の長さが弁軸６３の雄ネジ部２９が形成された部分に対して短く形成されている。そして、このように短く形成された弁軸ホルダ８６の下部側の一部を構成する小径筒部８５の外方に、円筒状に形成されたガイドステム８０の上側部分が装着され、このガイドステム８０の円筒部分８１に弁軸６３の先端大径部６２が案内されるように構成されている。なお、このガイドステム８０の凸状底面部８２は、カップ形状をなすケース４０と、弁室形成部材７４との間で移動不能に固定されている。   By the way, in such an electric valve 10A, the length of the portion of the valve shaft holder 86 where the female screw portion 28 is formed is shorter than the portion of the valve shaft 63 where the male screw portion 29 is formed. An upper portion of the guide stem 80 formed in a cylindrical shape is attached to the outside of the small-diameter cylindrical portion 85 that constitutes a part of the lower side of the valve shaft holder 86 that is formed in such a short shape. The distal end large diameter portion 62 of the valve shaft 63 is guided to the 80 cylindrical portions 81. The convex bottom portion 82 of the guide stem 80 is fixed so as not to move between the cup-shaped case 40 and the valve chamber forming member 74.

このような電動弁１０Ａでは、弁軸６３の上下方向への案内は、上部側が弁軸ホルダ８６により、下部側がガイドステム８０により行われ、さらに、ガイドステム８０により、弁軸６３が移動する際の弁軸６３の傾き（振れ）を規制している。   In such a motor-operated valve 10A, the valve shaft 63 is guided in the vertical direction by the valve shaft holder 86 on the upper side and the guide stem 80 on the lower side, and when the valve shaft 63 is moved by the guide stem 80. The inclination (swing) of the valve shaft 63 is regulated.

しかしながら、このような構成の電動弁１０Ａでは、弁軸ホルダ８６とガイドステム８０とが別部材であるととともに、これら弁軸ホルダ８６とガイドステム８０とが互いに離間して配置されるため、これらを同芯状に配置することが困難であった。これらの軸芯がずれてしまった場合には、結果として、弁軸６３の上下方向の移動が電動弁１０Ａの中心軸からずれる虞がある。このため、弁軸６３の下方に配置された弁体６１が弁座７２ｂに対して斜めに当接したり、不安定な姿勢で当接してしまうという問題があった。このような場合には、弁体６１と弁座７２ｂにより流量制御を正確に行う上で問題が生じる。   However, in the motor-operated valve 10A having such a configuration, the valve shaft holder 86 and the guide stem 80 are separate members, and the valve shaft holder 86 and the guide stem 80 are spaced apart from each other. It was difficult to arrange them in a concentric shape. If these axial centers are displaced, as a result, the vertical movement of the valve shaft 63 may be deviated from the central axis of the motor-operated valve 10A. For this reason, there existed a problem that the valve body 61 arrange | positioned under the valve shaft 63 will contact | abut diagonally with respect to the valve seat 72b, or contact | abutted with the unstable attitude | position. In such a case, a problem arises when the flow rate is accurately controlled by the valve body 61 and the valve seat 72b.

また、図４は、他の従来の電動弁２０Ａを示したものである。
この電動弁２０Ａでは、弁軸３の外周に形成された雄ネジ部５（可動ネジ部）と、弁軸ホルダ７の筒状小径部７ａの内周に形成された雌ネジ部８（固定ネジ部）とによりネジ送り機構９が構成されている。 FIG. 4 shows another conventional electric valve 20A.
In the electric valve 20A, a male screw portion 5 (movable screw portion) formed on the outer periphery of the valve shaft 3 and a female screw portion 8 (fixed screw) formed on the inner periphery of the cylindrical small diameter portion 7a of the valve shaft holder 7 are provided. The screw feed mechanism 9 is constituted by the above-mentioned parts.

そして、この電動弁２０Ａでは、ロータ１１の回転運動をネジ送り機構９によって弁軸３の直線運動に変換し、この直線運動により弁軸３の下方に配置された弁体１２を弁座１３に対して接離させ、これにより、冷媒等の流量を制御するようにしている。   In the motor-operated valve 20A, the rotational motion of the rotor 11 is converted into a linear motion of the valve shaft 3 by the screw feed mechanism 9, and the valve body 12 disposed below the valve shaft 3 is moved to the valve seat 13 by this linear motion. In contrast, the flow rate of the refrigerant or the like is controlled.

ところで、このような電動弁２０Ａでは、弁軸ホルダ７が筒状小径部７ａと筒状大径部７ｂとからなり、図３に示した弁軸ホルダ８６に比べて、弁軸６３に対して軸方向に長く形成されている。また、この電動弁２０Ａの弁軸ホルダ７は、その内周に形成された雌ネジ部８が、筒状小径部７ａの中間部付近から、その下端部に至るまで形成されている。そして、弁軸３の直下方に、コイルバネ５４と弁体１２とが配置されている。   By the way, in such an electric valve 20A, the valve shaft holder 7 is composed of a cylindrical small diameter portion 7a and a cylindrical large diameter portion 7b, and is compared with the valve shaft holder 63 as compared with the valve shaft holder 86 shown in FIG. It is long in the axial direction. Further, the valve shaft holder 7 of the electric valve 20A is formed such that the female thread portion 8 formed on the inner periphery thereof extends from the vicinity of the middle portion of the cylindrical small diameter portion 7a to the lower end portion thereof. A coil spring 54 and the valve body 12 are disposed immediately below the valve shaft 3.

このような構成の従来の電動弁２０Ａでは、弁軸３を上下方向に案内する部材は、２部材ではなく、長尺で一体物の弁軸ホルダ７のみである。したがって、「同芯のずれ」が生じにくい。   In the conventional motor-operated valve 20A having such a configuration, the member for guiding the valve shaft 3 in the vertical direction is not the two members but only the long and integral valve shaft holder 7. Therefore, “concentric misalignment” hardly occurs.

しかしながら、電動弁２０Ａの場合には、以下のような問題が生じる虞がある。
図５（Ａ）は、弁閉時の弁軸３と弁軸ホルダ７との位置関係を示したものであり、図４の状態に対応している。
一方、図５（Ｂ）は、完全に弁開時となったときの弁軸３と弁軸ホルダ７との位置関係を示したものである。 However, in the case of the electric valve 20A, the following problems may occur.
FIG. 5 (A) shows the positional relationship between the valve shaft 3 and the valve shaft holder 7 when the valve is closed, and corresponds to the state of FIG.
On the other hand, FIG. 5B shows the positional relationship between the valve shaft 3 and the valve shaft holder 7 when the valve is completely open.

図５（Ａ）、（Ｂ）から明らかなように、図５（Ａ）（弁閉状態）のときのネジ送り機構９の螺合長さＬ１と、図５（Ｂ）（弁開状態）のときのネジ送り機構９の螺合長さＬ２とを比べると、Ｌ１＜Ｌ２となる。   As apparent from FIGS. 5A and 5B, the screwing length L1 of the screw feed mechanism 9 in FIG. 5A (valve closed state) and FIG. 5B (valve open state). When the screwing length L2 of the screw feeding mechanism 9 at this time is compared, L1 <L2.

このように、従来の電動弁２０Ａの場合には、ネジ送り機構９の螺合長さが一定でなく、また動作中に螺合長さが変化してしまうとネジ送り機構９の動作安定性が損なわれ、耐久性が低下してしまうという問題があった。また、弁閉時の螺合長さＬ１が短いため、その短い部分に負荷が集中してしまう。結果として、ネジ送り機構９を高強度に設計する必要があった。   Thus, in the case of the conventional motor-operated valve 20A, the screwing length of the screw feeding mechanism 9 is not constant, and the operation stability of the screw feeding mechanism 9 is changed if the screwing length changes during operation. There was a problem that durability was deteriorated. Moreover, since the screwing length L1 at the time of valve closing is short, a load will concentrate on the short part. As a result, the screw feeding mechanism 9 has to be designed with high strength.

また、従来の電動弁２０Ａでは、図４に示したように、第１の継手１５と第２の継手１７とが弁室形成部材３１に接続されているが、いずれか一方の継手からいずれか他方の継手に供給される途中で弁室形成部材３１内に導入された流体の一部は、弁室１９を通り、図４において矢印で示したように、弁軸ホルダ７に設けられた均圧孔４１を介して弁軸ホルダ７の筒状大径部７ｂ内に導入されてくる。   Moreover, in the conventional motor-operated valve 20A, as shown in FIG. 4, the first joint 15 and the second joint 17 are connected to the valve chamber forming member 31. A part of the fluid introduced into the valve chamber forming member 31 while being supplied to the other joint passes through the valve chamber 19 and, as shown by the arrow in FIG. It is introduced into the cylindrical large diameter portion 7 b of the valve shaft holder 7 through the pressure hole 41.

しかしながら、弁軸ホルダ７の筒状大径部７ｂ内には、ネジ送り機構９の下端部が露出しているため、流体中に存在する異物がネジ送り機構９の内部に進入し、結果として、ネジ送り機構９の作動性を阻害してしまうという問題があった。   However, since the lower end portion of the screw feed mechanism 9 is exposed in the cylindrical large-diameter portion 7b of the valve shaft holder 7, foreign matter existing in the fluid enters the screw feed mechanism 9, and as a result There is a problem that the operability of the screw feed mechanism 9 is hindered.

特開２０１０−９６２０３号公報JP 2010-96203 A 特表２０１３−５３９８４９号公報Special table 2013-539849 gazette

本発明は、このような従来の実情に鑑み、上下方向に移動する弁体を常に安定した姿勢で弁座に当接させることができる電動弁を提供することを目的としている。   The present invention has been made in view of the above-described conventional situation, and an object of the present invention is to provide a motor-operated valve in which a valve body that moves in the vertical direction can always be brought into contact with a valve seat in a stable posture.

上記目的を達成するための本発明は、
カップ形状をなすケース６０と、
前記ケース６０の開口側の下端部に一体的に接続される弁室形成部材７０と、
前記ケース６０の内周に収容された回転可能なロータ２と、
前記弁室形成部材７０に対して相対的に回転不能に固定され、その筒状部６ａの内周に雌ネジ部６ｄが形成された弁軸ホルダ６と、
前記弁軸ホルダ６の内方に装着されて前記ロータ２と一体的に回転し、外周部に雄ネジ部４ａが形成され、さらに下方に配置された弁体３２を弁座部２１に対して上下方向に移動して弁の開閉動作を行う弁軸４と、
前記弁軸ホルダ６の雌ネジ部６ｄおよび前記弁軸４の前記雄ネジ部４ａから構成されるネジ送り機構Ａと、を備えた電動弁であって、
前記弁軸４は、上部側の外周に雄ネジ部４ａが形成されるとともに、前記雄ネジ部４ａの下方側に軸部分４ｂが形成され、
前記弁軸ホルダ６は、前記筒状部６ａの内周面上部開口部６ｇから下方に向かって前記雌ネジ部６ｄが設けられるとともに、前記筒状部６ａの内周面の下端部側に前記弁軸４の前記軸部分４ｂを案内する軸受部６ｅが設けられ、かつ前記弁軸ホルダ６は一体形成されたものであり、さらに前記弁軸ホルダ６の前記雌ネジ部６ｄの内径Ｄ１は、前記軸受部６ｅの内径Ｄ２より小さく設定され、
前記ロータ２の回転に伴って前記弁軸４が回転しながら上下方向に移動することにより、前記弁軸４が上から下、または下から上へ移動した際に、前記ネジ送り機構Ａの螺合長さＬが一定であることを特徴としている。 To achieve the above object, the present invention provides:
A cup-shaped case 60;
A valve chamber forming member 70 integrally connected to a lower end portion on the opening side of the case 60;
A rotatable rotor 2 housed in the inner periphery of the case 60;
A valve shaft holder 6 fixed to be relatively non-rotatable with respect to the valve chamber forming member 70 and having a female screw portion 6d formed on the inner periphery of the cylindrical portion 6a;
The valve body 32 is mounted on the inner side of the valve shaft holder 6 and rotates integrally with the rotor 2, the male screw portion 4 a is formed on the outer peripheral portion, and the valve body 32 disposed further below is attached to the valve seat portion 21. A valve shaft 4 that moves up and down to open and close the valve;
A screw feed mechanism A composed of a female screw portion 6d of the valve shaft holder 6 and the male screw portion 4a of the valve shaft 4,
The valve shaft 4 has a male screw part 4a formed on the outer periphery on the upper side, and a shaft part 4b formed on the lower side of the male screw part 4a.
The valve shaft holder 6 is provided with the female screw portion 6d downward from the inner peripheral surface upper opening 6g of the cylindrical portion 6a, and on the lower end side of the inner peripheral surface of the cylindrical portion 6a. A bearing portion 6e for guiding the shaft portion 4b of the valve shaft 4 is provided, and the valve shaft holder 6 is integrally formed. Further, an inner diameter D1 of the female screw portion 6d of the valve shaft holder 6 is Set smaller than the inner diameter D2 of the bearing portion 6e,
When the valve shaft 4 moves in the vertical direction as the rotor 2 rotates, the screw shaft of the screw feed mechanism A is screwed when the valve shaft 4 moves from top to bottom or from bottom to top. The total length L is constant.

このような構成の電動弁によれば、弁軸を常に安定した姿勢で上下方向に案内することができるので流量制御を正確に行うことができ、作動性を長期に渡り良好に維持することができる。   According to the motor-operated valve having such a configuration, the valve shaft can be always guided in the vertical direction in a stable posture, so that the flow rate can be accurately controlled and the operability can be maintained well over a long period of time. it can.

ここで、本発明では、
前記弁軸ホルダ６の外周側部には、前記弁室形成部材７０の内周側部に圧入される圧入部３４が設けられ、
前記圧入部３４が前記弁室形成部材７０内に圧入されることにより、前記弁室形成部材７０に対して前記弁体３２の芯出しが行われるよう構成されていることが好ましい。 Here, in the present invention,
On the outer peripheral side portion of the valve shaft holder 6, a press-fit portion 34 that is press-fitted into the inner peripheral side portion of the valve chamber forming member 70 is provided.
It is preferable that the valve body 32 is centered with respect to the valve chamber forming member 70 by press-fitting the press-fit portion 34 into the valve chamber forming member 70.

このように弁軸ホルダ６の外周側部に圧入部３４が設けられていれば、弁室形成部材７０に対する弁体３２の芯出しを簡単かつ高精度に行うことができる。しかも、構造も簡素であるため、誰でも確実に組み立て作業を行うことができる。しかも既存の構成部材で芯出しが可能であり治具を用いる必要もなく、電動弁の製造コストを従来よりも抑えることができる。   If the press-fit portion 34 is provided on the outer peripheral side portion of the valve shaft holder 6 in this way, the valve body 32 can be easily centered with respect to the valve chamber forming member 70 with high accuracy. Moreover, since the structure is simple, anyone can reliably perform the assembly work. In addition, centering is possible with existing components, and there is no need to use a jig, so that the manufacturing cost of the motor-operated valve can be reduced as compared with the prior art.

本発明に係る電動弁によれば、弁軸を弁軸ホルダにより常に安定した姿勢で上下方向に移動させることができるので流量制御を正確に行うことができ、作動性を長期に渡り良好に維持することができる。
また、本発明に係る電動弁は、特に、弁軸の有効径の縮小化に寄与することができる。 According to the motor-operated valve of the present invention, the valve shaft can be moved vertically in a stable posture by the valve shaft holder, so that the flow rate can be accurately controlled and the operability is maintained well over a long period of time. can do.
In addition, the motor-operated valve according to the present invention can particularly contribute to reducing the effective diameter of the valve shaft.

図１は本発明に係る電動弁の好ましい一実施形態を示す断面図である。FIG. 1 is a cross-sectional view showing a preferred embodiment of a motor-operated valve according to the present invention. 図２（Ａ）は図１に示した電動弁が弁閉状態にあるときのネジ送り機構の位置を示す断面図、図２（Ｂ）は弁開状態にあるときのネジ送り機構の位置を示す断面図である。2A is a cross-sectional view showing the position of the screw feed mechanism when the motorized valve shown in FIG. 1 is in the valve closed state, and FIG. 2B is the position of the screw feed mechanism when in the valve open state. It is sectional drawing shown. 図３は特開２０１０−９６２０３号公報に開示されている従来の電動弁の断面図である。FIG. 3 is a cross-sectional view of a conventional motor-operated valve disclosed in Japanese Patent Application Laid-Open No. 2010-96203. 図４は特表２０１３−５３９８４９号公報に開示されている他の従来の電動弁の断面図である。FIG. 4 is a cross-sectional view of another conventional motor-operated valve disclosed in Japanese Translation of PCT International Publication No. 2013-539849. 図５（Ａ）は、図４に示した他の従来の電動弁が弁閉状態にあるときのネジ送り機構の位置を示す断面図、図５（Ｂ）は、図４に示した他の従来の電動弁が弁開状態にあるときのネジ送り機構の位置を示す断面図である。5A is a cross-sectional view showing the position of the screw feed mechanism when the other conventional motor-operated valve shown in FIG. 4 is in the valve-closed state, and FIG. 5B is another view shown in FIG. It is sectional drawing which shows the position of the screw feed mechanism when the conventional motor operated valve is in a valve open state.

以下に、図面を参照しながら、本発明の好ましい一実施形態について説明する。
図１は、本発明の好ましい一実施形態の電動弁を示した断面図である。
なお、本明細書において、「上」あるいは「下」とは図１の状態で規定したものである。 Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a motor-operated valve according to a preferred embodiment of the present invention.
In the present specification, “upper” or “lower” is defined in the state of FIG.

この電動弁１０では、非磁性体製で筒形のカップ形状をなすケース６０の開口側の下端部に弁室形成部材７０が溶接により一体的に接続されている。
弁室形成部材７０の弁室７０ａ内には、下方向（軸方向）に第１の継手３８が接続され、側方に第２の継手３７が接続され、第１の継手３８が接続される弁室形成部材７０の入出力ポート１４の上部に、弁座部２１が固設されている。 In the motor-operated valve 10, a valve chamber forming member 70 is integrally connected to a lower end portion on the opening side of a case 60 made of a non-magnetic material and having a cylindrical cup shape by welding.
In the valve chamber 70a of the valve chamber forming member 70, the first joint 38 is connected in the downward direction (axial direction), the second joint 37 is connected to the side, and the first joint 38 is connected. A valve seat portion 21 is fixed on the input / output port 14 of the valve chamber forming member 70.

なお、この弁座部２１は、ケース６０の下端側に配置される弁室形成部材７０と別部材であるが、弁座部２１は、弁室形成部材７０に直接形成されていても良い。
ケース６０の内周には、回転可能なロータ２が収容されている。 The valve seat portion 21 is a separate member from the valve chamber forming member 70 disposed on the lower end side of the case 60, but the valve seat portion 21 may be formed directly on the valve chamber forming member 70.
A rotatable rotor 2 is accommodated in the inner periphery of the case 60.

ケース６０の外周には、図示しないヨーク、ボビン、およびコイル等からなるステータが配置され、ロータ２とステータとでステッピングモータが構成されている。
また、ケース６０の下端部６０ａと弁室形成部材７０の上端部７０ｂとの間には、内部に貫通孔が形成された筒状の弁軸ホルダ６が、そのフランジ部６ｆを介して弁室形成部材７０に対し相対的に回転不能に固定されている。この弁軸ホルダ６は、一体形成された単一部材であり、好ましくは、適宜な樹脂により一体成形されている。そして、弁軸ホルダ６は、後述する弁軸４の傾きを抑制する機能を有している。 On the outer periphery of the case 60, a stator including a yoke, a bobbin, and a coil (not shown) is arranged, and the rotor 2 and the stator constitute a stepping motor.
Further, between the lower end portion 60a of the case 60 and the upper end portion 70b of the valve chamber forming member 70, a cylindrical valve shaft holder 6 in which a through hole is formed is provided via the flange portion 6f. It is fixed so as not to rotate relative to the forming member 70. The valve shaft holder 6 is a single member that is integrally formed, and is preferably integrally formed of an appropriate resin. And the valve shaft holder 6 has a function which suppresses the inclination of the valve shaft 4 mentioned later.

上記弁軸ホルダ６は、上部側の筒状部６ａと下部側の筒状大径部６ｂと、弁室形成部材７０の内周側部に圧入される圧入部３４と、リング状のフランジ部６ｆとからなる。
弁軸ホルダ６の圧入部３４は、図示しないが、弁軸ホルダ６の筒状大径部６ｂの外周側部に所定間隔離間して複数個設けられている。本実施形態では、周方向に離間して４箇所に圧入部３４が設けられているが、特に４箇所に限定されるものではなく、例えば１８０°の角度毎に設けられている場合には２箇所でもよい。ただし、１８０°の角度毎に２箇所に圧入部３４を設けた場合は、弁室形成部材７０に弁軸ホルダ６を圧入する際に、弁軸ホルダ６がずれて弁室形成部材７０に対して斜めに傾く虞がある。したがって、さらに確実に弁室形成部材７０に弁軸ホルダ６を固定するには、この圧入部３４を３箇所以上設けることが好ましい。このように圧入部３４を３箇所以上設ければ、弁室形成部材７０に対して弁軸ホルダ６を圧入する際に、弁軸ホルダ６が前後左右にずれる虞がなく、確実に芯出しを確実に行うことができる。 The valve shaft holder 6 includes an upper cylindrical portion 6a, a lower cylindrical large diameter portion 6b, a press-fit portion 34 that is press-fitted into the inner peripheral side portion of the valve chamber forming member 70, and a ring-shaped flange portion. 6f.
Although not shown, a plurality of press-fitting portions 34 of the valve shaft holder 6 are provided on the outer peripheral side portion of the cylindrical large-diameter portion 6b of the valve shaft holder 6 at a predetermined interval. In the present embodiment, the press-fit portions 34 are provided at four locations apart from each other in the circumferential direction. However, the press-fit portions 34 are not particularly limited to four locations. It may be a place. However, when the press-fit portions 34 are provided at two positions every 180 °, when the valve shaft holder 6 is press-fitted into the valve chamber forming member 70, the valve shaft holder 6 is displaced to the valve chamber forming member 70. There is a risk of tilting. Therefore, in order to more securely fix the valve shaft holder 6 to the valve chamber forming member 70, it is preferable to provide three or more press-fit portions 34. If three or more press-fitting portions 34 are provided in this way, when the valve shaft holder 6 is press-fitted into the valve chamber forming member 70, the valve shaft holder 6 does not have a risk of shifting back and forth, and left and right, and the centering is surely performed. It can be done reliably.

また、弁軸ホルダ６の筒状部６ａの外周には、ロータ２のストッパ部２ａが案内される螺旋溝が形成されている。さらに、弁軸ホルダ６の筒状大径部６ｂの側面には、弁軸ホルダ６の内部に形成された弁軸ホルダ室８３と弁軸ホルダ６の外部空間との均圧を図る均圧孔５１が穿設されている。このような均圧孔５１を設けることにより、弁ホルダ２５の移動動作がスムーズに行われる。   A spiral groove for guiding the stopper portion 2 a of the rotor 2 is formed on the outer periphery of the cylindrical portion 6 a of the valve shaft holder 6. Furthermore, a pressure equalization hole for equalizing the pressure between the valve shaft holder chamber 83 formed inside the valve shaft holder 6 and the outer space of the valve shaft holder 6 is formed in the side surface of the cylindrical large diameter portion 6 b of the valve shaft holder 6. 51 is drilled. By providing such a pressure equalizing hole 51, the moving operation of the valve holder 25 is performed smoothly.

さらに、この弁軸ホルダ６では、筒状部６ａの内周面上部開口部６ｇから下方に向かって雌ネジ部６ｄが形成され、雌ネジ部６ｄの下方に、ネジ溝が形成されていない軸受部６ｅが形成されている。この軸受部６ｅにより、後述する弁軸４の傾き（振れ）が防止される。   Further, in this valve shaft holder 6, a female screw part 6d is formed downward from the inner peripheral surface upper opening 6g of the cylindrical part 6a, and a screw groove is not formed below the female screw part 6d. A portion 6e is formed. The bearing 6e prevents the later-described valve shaft 4 from tilting (swinging).

ロータ２の軸芯部分には、ブッシュ部材３３を介して弁軸４が貫通して配置されている。弁軸４の主要部は弁軸ホルダ６の内方に装着されており、この弁軸４は、ロータ２と一体的に回転する。弁軸４の上部側の外周部には雄ネジ部４ａが形成され、この雄ネジ部４ａから縮径部４ｃを挟んだ下方側に、軸部分４ｂが形成されている。   A valve shaft 4 is disposed through the shaft core portion of the rotor 2 via a bush member 33. The main part of the valve shaft 4 is mounted inside the valve shaft holder 6, and the valve shaft 4 rotates integrally with the rotor 2. A male screw portion 4a is formed on the outer peripheral portion on the upper side of the valve shaft 4, and a shaft portion 4b is formed on the lower side across the reduced diameter portion 4c from the male screw portion 4a.

そして、弁軸４の外周に形成された雄ネジ部４ａと、弁軸ホルダ６の内周に形成された雌ネジ部６ｄとにより、ネジ送り機構Ａが構成されている。
また、弁軸４の下端側であって、かつ弁軸ホルダ６における筒状大径部６ｂの内方には、筒状の弁ホルダ２５が配置され、この弁ホルダ２５は上端部側がプレス成形により略直角に折り曲げられている。弁ホルダ２５はこの折り曲げられたフランジ部により、弁軸４に対する抜け止めがなされている。そして、筒状の弁ホルダ２５内には、圧縮されたコイルバネ２７とバネ受け３５とが収容されている。また、弁ホルダ２５の下端に、弁体３２が溶接などにより固着されている。 A screw feed mechanism A is configured by the male screw portion 4 a formed on the outer periphery of the valve shaft 4 and the female screw portion 6 d formed on the inner periphery of the valve shaft holder 6.
A cylindrical valve holder 25 is disposed on the lower end side of the valve shaft 4 and inside the cylindrical large-diameter portion 6b of the valve shaft holder 6, and the upper end portion of the valve holder 25 is press-molded. Is bent at a substantially right angle. The valve holder 25 is prevented from coming off from the valve shaft 4 by the bent flange portion. In the cylindrical valve holder 25, a compressed coil spring 27 and a spring receiver 35 are accommodated. A valve body 32 is fixed to the lower end of the valve holder 25 by welding or the like.

そして、この電動弁１０では、弁軸４と弁ホルダ２５とバネ受け３５とコイルバネ２７と弁体３２などは、一体的に上下動する１つの弁軸組立体５０として構成されている。なお、弁ホルダ２５の下端部に固設された弁体３２は、弁軸４に対して軸方向の相対移動および相対回転が可能である。   In the motor-operated valve 10, the valve shaft 4, the valve holder 25, the spring receiver 35, the coil spring 27, the valve body 32, and the like are configured as one valve shaft assembly 50 that moves up and down integrally. The valve body 32 fixed to the lower end portion of the valve holder 25 is capable of relative movement and rotation in the axial direction with respect to the valve shaft 4.

なお、本実施の形態における弁軸４の雄ネジ部の有効径は２〜３ｍｍである。
本実施形態では、弁軸４の下方に配置された弁体３２を、常に安定した姿勢で弁座部２１に当接させるために、以下のような特徴的な構成が採用されている。 In addition, the effective diameter of the external thread part of the valve shaft 4 in this Embodiment is 2-3 mm.
In the present embodiment, the following characteristic configuration is employed in order for the valve body 32 disposed below the valve shaft 4 to always contact the valve seat portion 21 in a stable posture.

すなわち、弁軸ホルダ６の軸受部６ｅは、筒状部６ａの下端部側に設けられており、弁軸４の雄ネジ部４ａは、筒状部６ａの上部側に設けられている。
このように、軸受部６ｅが筒状部６ａの下端部側に設けられ、かつ弁軸４の雄ネジ部４ａが筒状部６ａの上部側に設けられていると、弁軸４の振れ幅を少なくすることができる。 That is, the bearing portion 6e of the valve shaft holder 6 is provided on the lower end side of the cylindrical portion 6a, and the male screw portion 4a of the valve shaft 4 is provided on the upper side of the cylindrical portion 6a.
As described above, when the bearing portion 6e is provided on the lower end side of the cylindrical portion 6a and the male screw portion 4a of the valve shaft 4 is provided on the upper side of the cylindrical portion 6a, the swing width of the valve shaft 4 is increased. Can be reduced.

また、弁軸ホルダ６の雌ネジ部６ｄの内径Ｄ１は、弁軸ホルダ６の軸受部６ｅの内径Ｄ２より小さく設定されている。
このように、Ｄ２＜Ｄ１に設定すると、ネジ送り機構Ａの螺合長さＬを常に一定の長さに設定することができる。
以下、上記のように構成された電動弁１０の動作について説明する。 Further, the inner diameter D1 of the female screw portion 6d of the valve shaft holder 6 is set smaller than the inner diameter D2 of the bearing portion 6e of the valve shaft holder 6.
As described above, when D2 <D1, the screwing length L of the screw feeding mechanism A can be always set to a constant length.
Hereinafter, the operation of the motor-operated valve 10 configured as described above will be described.

電動弁１０を閉じるときには、図示しないコイルにパルス信号を与えることによりロータ２が上面視時計方向に回転すると同時に、ネジ送り機構Ａの作用により弁軸４も回転しながら下降し、弁体３２が弁座部２１内に挿入される。弁体３２が弁座部２１内の所定位置まで挿入された後、ロータ２がさらに回転して弁体３２と弁座部２１とが互いに当接し、この状態でロータ２のストッパ部２ａが弁軸ホルダ６のストッパ部６ｈに当接し、弁軸４の下降が強制的に停止され、図１の姿勢で動作が終了する。   When the motor-operated valve 10 is closed, by applying a pulse signal to a coil (not shown), the rotor 2 rotates clockwise as viewed from above, and at the same time, the valve shaft 4 also rotates and lowers due to the action of the screw feed mechanism A. It is inserted into the valve seat part 21. After the valve body 32 is inserted to a predetermined position in the valve seat portion 21, the rotor 2 further rotates and the valve body 32 and the valve seat portion 21 come into contact with each other. In this state, the stopper portion 2a of the rotor 2 Abutting against the stopper portion 6h of the shaft holder 6, the lowering of the valve shaft 4 is forcibly stopped, and the operation is ended in the posture of FIG.

一方、電動弁１０を開く場合には、例えば、図１の状態でロータ２が反時計方向に回転するパルス信号を与え、ロータ２が反時計方向に回転すると、これと同時に弁軸４も回転上昇し、弁体３２が弁座部２１から離れて電動弁１０が開弁する。   On the other hand, when the motor-operated valve 10 is opened, for example, a pulse signal for rotating the rotor 2 counterclockwise in the state of FIG. 1 is given, and when the rotor 2 rotates counterclockwise, the valve shaft 4 also rotates simultaneously. The valve body 32 moves away from the valve seat portion 21 and the motor-operated valve 10 opens.

このようにして流量制御を行う電動弁１０では、上述したように、弁閉時の状態を示す図２（Ａ）と、弁開時の状態を示す図２（Ｂ）では、ネジ送り機構Ａの螺合長さＬが常に一定になる。すなわち、図２（Ａ）のように、弁軸４が最大限下方に移動したときにも、図２（Ｂ）のように弁軸４が最大限上方に移動したときにも、弁軸ホルダ６の雌ネジ部６ｄの全域に亘って雄ネジ部４ａが螺合しているため、螺合長さＬが常に一定になる。   In the motor-operated valve 10 that controls the flow rate in this way, as described above, in FIG. 2A showing the state when the valve is closed and FIG. 2B showing the state when the valve is opened, the screw feed mechanism A The screwing length L is always constant. That is, when the valve shaft 4 is moved downward as much as shown in FIG. 2A, or when the valve shaft 4 is moved upward as much as shown in FIG. Since the male screw portion 4a is screwed over the entire area of the female screw portion 6d, the screwing length L is always constant.

よって、図１に示した弁体３２は常に安定した姿勢で弁座部２１に当接または弁座部２１から離反する。
したがって、電動弁１０では、流量調整を正確に行うことができる。 Therefore, the valve body 32 shown in FIG. 1 always contacts or separates from the valve seat portion 21 in a stable posture.
Therefore, the electric valve 10 can accurately adjust the flow rate.

また、電動弁１０では、ネジ送り機構Ａは、弁軸ホルダ６の筒状大径部６ｂ内に形成された弁軸ホルダ室８３に接しておらず、内方に位置している。
したがって、本実施形態の場合には、弁軸ホルダ室８３内に導入された流体内に仮にゴミ等が混入されているとしても、ネジ送り機構Ａへの噛み込みが防止される。これにより、弁開度の調整に不調を来すことがない。 In the motor-operated valve 10, the screw feed mechanism A is not in contact with the valve shaft holder chamber 83 formed in the cylindrical large-diameter portion 6 b of the valve shaft holder 6 and is located inward.
Therefore, in the present embodiment, even if dust or the like is mixed in the fluid introduced into the valve shaft holder chamber 83, the screw feed mechanism A is prevented from being bitten. Thereby, the adjustment of the valve opening degree does not cause trouble.

これにより、流量制御を正確に行うことができる。
以上、本発明に係る電動弁の好ましい実施形態について説明したが、本発明はこれに限定されない。 Thereby, flow control can be performed correctly.
As mentioned above, although preferred embodiment of the motor operated valve which concerns on this invention was described, this invention is not limited to this.

例えば、本実施形態では、弁軸４と弁ホルダ２５とバネ受け３５とコイルバネ２７と弁体３２などは１つの弁軸組立体５０として構成されているが、弁体３２は、他の構成で組み込まれていても良い。   For example, in this embodiment, the valve shaft 4, the valve holder 25, the spring receiver 35, the coil spring 27, the valve body 32, and the like are configured as one valve shaft assembly 50, but the valve body 32 has other configurations. It may be incorporated.

また、本実施形態では、弁体３２と弁座部２１とが互いに当接した状態で、ロータ２のストッパ部２ａと弁軸ホルダ６のストッパ部６ｈとにより弁軸４の下降を停止するようにしたが、弁体３２と弁座部２１とが互いに当接する前に弁軸４の下降を停止するようストッパ部２ａとストッパ部６ｈとが当接するタイミングを設定してもよい。   Further, in the present embodiment, the lowering of the valve shaft 4 is stopped by the stopper portion 2a of the rotor 2 and the stopper portion 6h of the valve shaft holder 6 in a state where the valve body 32 and the valve seat portion 21 are in contact with each other. However, the timing at which the stopper portion 2a and the stopper portion 6h abut may be set so that the lowering of the valve shaft 4 is stopped before the valve body 32 and the valve seat portion 21 abut each other.

また、本実施形態に係る弁軸４の雄ネジ部４ａの有効径は２〜３ｍｍのような小径の場合に有効に適用可能できるが、勿論、それ以上の径にも適用可能である。   In addition, the effective diameter of the male threaded portion 4a of the valve shaft 4 according to the present embodiment can be effectively applied when the diameter is as small as 2 to 3 mm, but of course, it can also be applied to diameters larger than that.

２ ロータ
２ａ ストッパ部
４ 弁軸
４ａ 雄ネジ部
４ｂ 軸部分
４ｃ 縮径部
６ 弁軸ホルダ
６ａ 筒状部
６ｂ 筒状大径部
６ｃ 下端部
６ｄ 雌ネジ部
６ｅ 軸受部
６ｈ ストッパ部
６ｆ フランジ部
６ｇ 内周面上部開口部
６ｈ ストッパ部
１０ 電動弁
１４ 入出力ポート
２１ 弁座部
２５ 弁ホルダ
２７ コイルバネ
３２ 弁体
３４ 圧入部
３５ バネ受け
３３ ブッシュ部材
３７ 第２の継手
３８ 第１の継手
５１ 均圧孔
６０ ケース
６０ａ 下端部
７０ 弁室形成部材
７０ａ 弁室
７０ｂ 上端部
８３ 弁軸ホルダ室
Ａ ネジ送り機構
Ｄ１ 弁軸ホルダの雌ネジ部の内径
Ｄ２ 弁軸ホルダの軸受部の内径
Ｌ 螺合長さ 2 Rotor 2a Stopper part 4 Valve shaft 4a Male thread part 4b Shaft part 4c Reduced diameter part 6 Valve shaft holder 6a Tubular part 6b Tubular large diameter part 6c Lower end part 6d Female thread part 6e Bearing part 6h Stopper part 6f Flange part 6g Inner peripheral surface upper opening 6h Stopper 10 Motor operated valve 14 Input / output port 21 Valve seat 25 Valve holder 27 Coil spring 32 Valve body 34 Press-fit portion 35 Spring support 33 Bush member 37 Second joint 38 First joint 51 Pressure equalization Hole 60 Case 60a Lower end portion 70 Valve chamber forming member 70a Valve chamber 70b Upper end portion 83 Valve shaft holder chamber A Screw feed mechanism D1 Inner diameter D2 of female screw portion of valve shaft holder Inner diameter L of bearing portion of valve shaft holder Screw length

Claims (2)

カップ形状をなすケース（６０）と、
前記ケース（６０）の開口側の下端部に一体的に接続される弁室形成部材（７０）と、
前記ケース（６０）の内周に収容された回転可能なロータ（２）と、
前記弁室形成部材（７０）に対して相対的に回転不能に固定され、その筒状部（６ａ）の内周に雌ネジ部（６ｄ）が形成された弁軸ホルダ（６）と、
前記弁軸ホルダ（６）の内方に装着されて前記ロータ（２）と一体的に回転し、外周部に雄ネジ部（４ａ）が形成され、さらに下方に配置された弁体（３２）を弁座部（２１）に対して上下方向に移動して弁の開閉動作を行う弁軸（４）と、
前記弁軸ホルダ（６）の雌ネジ部（６ｄ）および前記弁軸（４）の前記雄ネジ部（４ａ）から構成されるネジ送り機構（Ａ）と、を備えた電動弁であって、
前記弁軸（４）は、上部側の外周に雄ネジ部（４ａ）が形成されるとともに、前記雄ネジ部（４ａ）の下方側に軸部分（４ｂ）が形成され、
前記弁軸ホルダ（６）は、前記筒状部（６ａ）の内周面上部開口部（６ｇ）から下方に向かって前記雌ネジ部（６ｄ）が設けられるとともに、前記筒状部（６ａ）の内周面の下端部側に前記弁軸（４）の前記軸部分（４ｂ）を案内する軸受部（６ｅ）が設けられ、かつ前記弁軸ホルダ（６）は一体形成されたものであり、さらに前記弁軸ホルダ（６）の前記雌ネジ部（６ｄ）の内径（Ｄ１）は、前記軸受部（６ｅ）の内径（Ｄ２）より小さく設定され、
前記ロータ（２）の回転に伴って前記弁軸（４）が回転しながら上下方向に移動することにより、前記弁軸（４）が上から下、または下から上へ移動した際に、前記ネジ送り機構（Ａ）の螺合長さ（Ｌ）が一定であることを特徴とする電動弁。 A cup-shaped case (60);
A valve chamber forming member (70) integrally connected to the lower end portion on the opening side of the case (60);
A rotatable rotor (2) housed in the inner periphery of the case (60);
A valve shaft holder (6) fixed in a relatively non-rotatable manner with respect to the valve chamber forming member (70) and having a female thread portion (6d) formed on the inner periphery of the cylindrical portion (6a);
A valve body (32) mounted on the inner side of the valve shaft holder (6) and rotated integrally with the rotor (2) to form a male threaded portion (4a) on the outer peripheral portion and further disposed below. A valve shaft (4) for moving the valve seat in the vertical direction relative to the valve seat (21) to open and close the valve;
A screw feed mechanism (A) comprising a female screw part (6d) of the valve shaft holder (6) and the male screw part (4a) of the valve shaft (4),
The valve shaft (4) has a male screw part (4a) formed on the outer periphery on the upper side, and a shaft part (4b) formed on the lower side of the male screw part (4a).
The valve shaft holder (6) is provided with the female thread portion (6d) downward from the inner circumferential surface upper opening (6g) of the cylindrical portion (6a) and the cylindrical portion (6a). A bearing portion (6e) for guiding the shaft portion (4b) of the valve shaft (4) is provided on the lower end side of the inner peripheral surface of the valve shaft, and the valve shaft holder (6) is integrally formed. Further, the inner diameter (D1) of the female thread portion (6d) of the valve shaft holder (6) is set smaller than the inner diameter (D2) of the bearing portion (6e),
When the valve shaft (4) moves from top to bottom or from bottom to top by moving the valve shaft (4) in the vertical direction while rotating as the rotor (2) rotates, A motor-operated valve characterized in that the screwing length (L) of the screw feed mechanism (A) is constant. 前記弁軸ホルダ（６）の外周側部には、前記弁室形成部材（７０）の内周側部に圧入される圧入部（３４）が設けられ、
前記圧入部（３４）が前記弁室形成部材（７０）内に圧入されることにより、前記弁室形成部材（７０）に対して前記弁体（３２）の芯出しが行われるよう構成されていることを特徴とする請求項１に記載の電動弁。 On the outer peripheral side of the valve shaft holder (6), there is provided a press-fitting portion (34) that is press-fitted into the inner peripheral side of the valve chamber forming member (70)
The valve body (32) is centered with respect to the valve chamber forming member (70) by press-fitting the press-fitting portion (34) into the valve chamber forming member (70). The motor-operated valve according to claim 1, wherein:
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