JP6270650B2 - Motorized valve - Google Patents

Motorized valve Download PDF

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JP6270650B2
JP6270650B2 JP2014147984A JP2014147984A JP6270650B2 JP 6270650 B2 JP6270650 B2 JP 6270650B2 JP 2014147984 A JP2014147984 A JP 2014147984A JP 2014147984 A JP2014147984 A JP 2014147984A JP 6270650 B2 JP6270650 B2 JP 6270650B2
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valve
valve shaft
holder
shaft
motor
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JP2016023711A (en
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大樹 中川
大樹 中川
一也 小林
一也 小林
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Saginomiya Seisakusho Inc
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Saginomiya Seisakusho Inc
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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
    • F16K1/32—Details
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F16K31/042—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves with electric means, e.g. for controlling the motor or a clutch between the valve and the motor
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • F16K31/502—Mechanical actuating means with screw-spindle or internally threaded actuating means actuating pivotable valve members
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • F16K31/504—Mechanical actuating means with screw-spindle or internally threaded actuating means the actuating means being rotable, rising, and having internal threads which co-operate with threads on the outside of the valve body

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（例えば、特許文献１）。   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 (for example, Patent Document 1).

図５（Ａ）、（Ｂ）はこのような従来の電動弁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の内周に形成された雌ネジ部８（固定ネジ部）とにより弁軸３に対するネジ送り機構９が構成されている。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の直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、冷媒等の流体の流量を調整するようにしている。 5A and 5B show such a conventional motor-operated valve 20A.
In this electric valve 20A, the valve shaft is constituted by 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 portion) formed on the inner periphery of the valve shaft holder 7. 3 is configured. In the motor-operated valve 20A, the rotational movement of the rotor 11 is converted into the linear movement of the valve shaft 3 by the screw feed mechanism 9, and the valve body 12 disposed immediately below the valve shaft 3 is converted into the valve seat 13 by this linear movement. Thus, the flow rate of a fluid such as a refrigerant is adjusted.

なお、この弁体１２は、弁ポート１３ａに当接する部位の上方部に、筒状の弁ホルダ１２ａが一体に具備されている。
ところで、このような電動弁２０Ａでは、図６に拡大して示したように、弁軸３の雄ネジ部５の上部側に、所定長さの筒状の軸部分３ａが形成されている。 In addition, this valve body 12 is integrally provided with a cylindrical valve holder 12a at an upper portion of a portion that contacts the valve port 13a.
By the way, in such an electric valve 20A, as shown in an enlarged view in FIG. 6, a cylindrical shaft portion 3a having a predetermined length is formed on the upper side of the male screw portion 5 of the valve shaft 3.

また、弁軸ホルダ７は、上部側に筒状小径部７ａを有し、下部側に筒状大径部７ｂを有している。さらに、上部側の筒状小径部７ａの内周面下部に雌ネジ部８が形成され、内周面上部に筒状の軸受部１８が形成されている。   The valve shaft holder 7 has a cylindrical small diameter portion 7a on the upper side and a cylindrical large diameter portion 7b on the lower side. Further, a female screw portion 8 is formed at the lower portion of the inner peripheral surface of the upper cylindrical small diameter portion 7a, and a cylindrical bearing portion 18 is formed at the upper portion of the inner peripheral surface.

このように、弁軸ホルダ７に軸受部１８を設けているため、弁軸３の傾き（振れ）を抑制することができる。
上記のように形成された弁軸ホルダ７は、図５（Ａ）に示したように、筒形のカップ形状をなすケース４０の下端部４０ａと、弁室形成部材３１の上端部３１ａとの突き合わせ部に回転不能に固定されている。また、弁軸ホルダ７の下端部は、弁室形成部材３１内に配置されている。 Thus, since the bearing part 18 is provided in the valve shaft holder 7, the inclination (vibration) of the valve shaft 3 can be suppressed.
As shown in FIG. 5A, the valve shaft holder 7 formed as described above includes a lower end portion 40a of the case 40 having a cylindrical cup shape and an upper end portion 31a of the valve chamber forming member 31. It is fixed to the butting part so as not to rotate. Further, the lower end portion of the valve shaft holder 7 is disposed in the valve chamber forming member 31.

さらに、弁室形成部材３１の軸方向の下部に設けた入出力ポート３１ｂ内には、第１の継手１７が接続されているとともに、弁室形成部材３１の側方には、第２の継手１９が接続されている。また、入出力ポート３１ｂ内には、上下方向に貫通した略筒状の弁ガイド部材３４１が移動不能に固設されている。なお、この弁ガイド部材３４の下方に弁座１３が設けられている。   Further, the first joint 17 is connected to the input / output port 31b provided at the lower part of the valve chamber forming member 31 in the axial direction, and the second joint is provided on the side of the valve chamber forming member 31. 19 is connected. A substantially cylindrical valve guide member 341 penetrating in the vertical direction is fixed in the input / output port 31b so as not to move. A valve seat 13 is provided below the valve guide member 34.

また、弁軸３の下端部には大径部３ｂが設けられ、この大径部３ｂには、図５（Ｂ）に拡大して示したように、弁体固定部材５６が遊嵌されている。
弁座１３に対して着離座する弁体１２は、直接的な弁機能を呈する先端側の弁部と、弁部の上方に配置された筒状の弁ホルダ１２ａとから構成されている。そして、弁体固定部材５６には、筒状の弁ホルダ１２ａが固定されている。また、弁体１２と一体の弁ホルダ１２ａ内には、圧縮状態のコイルバネ５４と、凸形状のバネ受け部材５５とが収容されている。 Further, a large diameter portion 3b is provided at the lower end portion of the valve shaft 3, and a valve body fixing member 56 is loosely fitted to the large diameter portion 3b as shown in an enlarged view in FIG. Yes.
The valve body 12 seated and separated with respect to the valve seat 13 is composed of a valve portion on the tip side that exhibits a direct valve function, and a cylindrical valve holder 12a disposed above the valve portion. A tubular valve holder 12 a is fixed to the valve body fixing member 56. A compressed coil spring 54 and a convex spring receiving member 55 are accommodated in the valve holder 12a integrated with the valve body 12.

このバネ受け部材５５には、コイルバネ５４からの付勢力が作用している。
これにより、弁座１３に形成された弁ポート１３ａに弁体１２が当接され、さらに弁軸３が弁閉方向に移動すると、コイルバネ５４が圧縮される。そして、バネ力により弁体１２が押し付けられ、弁ポート１３ａが閉塞される。 A biasing force from the coil spring 54 acts on the spring receiving member 55.
As a result, when the valve body 12 is brought into contact with the valve port 13a formed in the valve seat 13 and the valve shaft 3 further moves in the valve closing direction, the coil spring 54 is compressed. And the valve body 12 is pressed by spring force, and the valve port 13a is obstruct | occluded.

ところで、このような構成の電動弁２０Ａでは、図６に示したように、弁軸ホルダ７の内周に設けた雌ネジ部８の上方に所定長さの軸受部１８が形成されている。そして、弁軸ホルダ７の内周に弁軸３を螺合させたときに、弁軸３の軸部分３ａが軸受部１８内に配置される。この状態で、弁軸３が上下方向に移動したとしても、弁軸３の軸部分３ａが軸受部１８内に配置されているため、弁軸３の傾き（振れ）が抑制されて、弁軸３は安定した姿勢で上下方向に案内される。   By the way, in the electric valve 20A having such a configuration, as shown in FIG. 6, a bearing portion 18 having a predetermined length is formed above the female screw portion 8 provided on the inner periphery of the valve shaft holder 7. When the valve shaft 3 is screwed onto the inner periphery of the valve shaft holder 7, the shaft portion 3 a of the valve shaft 3 is disposed in the bearing portion 18. In this state, even if the valve shaft 3 moves in the vertical direction, the shaft portion 3a of the valve shaft 3 is disposed in the bearing portion 18, so that the inclination (swing) of the valve shaft 3 is suppressed, and the valve shaft 3 3 is guided in a vertical direction in a stable posture.

しかしながら、このような電動弁２０Ａであっても、以下のような問題が生じ易い。この問題は、例えば、弁軸３の雄ネジ部５の有効径が２〜３ｍｍのように、細い場合に生じ易い。   However, even with such an electric valve 20A, the following problems are likely to occur. This problem is likely to occur when the effective diameter of the male screw portion 5 of the valve shaft 3 is as thin as 2 to 3 mm, for example.

すなわち、従来の電動弁２０Ａでは、図７（Ａ）、（Ｂ）に示したように、弁軸３の雄ネジ部５の外径をＣ１、コイルバネ５４の下端側のバネ受け部に対する着座部分の内径をＣ２としたとき、Ｃ１＞Ｃ２に設定されている。   That is, in the conventional motor-operated valve 20A, as shown in FIGS. 7A and 7B, the outer diameter of the male screw portion 5 of the valve shaft 3 is C1, and the seating portion with respect to the spring receiving portion on the lower end side of the coil spring 54 When the inner diameter of C2 is C2, C1> C2.

上述のようなＣ１＞Ｃ２の関係に設定されているため、弁軸ホルダ７の筒状小径部７ａの下端部７ｃから、弁軸３の下方に延びる延出部分４１を包含し、さらに凸形状のバネ受け部材５５の受け面５５ａまでを結ぶ仮想空間Ｂは、下方に向かう程、次第に径が細くなる逆円錐台形状になっている。   Since the relationship of C1> C2 as described above is set, the extended portion 41 extending downward from the valve shaft 3 is included from the lower end portion 7c of the cylindrical small diameter portion 7a of the valve shaft holder 7, and further convex. The virtual space B that connects up to the receiving surface 55a of the spring receiving member 55 has an inverted truncated cone shape that gradually decreases in diameter toward the lower side.

また、この仮想空間Ｂの重心位置Ｇは、上面と下面の直径が等しい円筒体（円柱体）である場合に比べて、受け面５５ａからの高さは高くなる。
このため、Ｃ１＞Ｃ２の関係に設定されていると、バネの座りが悪い。すなわち、コイルバネ５４は、弁軸３が下方に押圧されて圧縮されてきたときに左右に座屈し易い。 Further, the center of gravity G of the virtual space B has a height higher than the receiving surface 55a as compared with the case where the upper surface and the lower surface have the same diameter (cylindrical body).
For this reason, when the relationship of C1> C2 is set, the sitting of the spring is bad. That is, the coil spring 54 is likely to buckle left and right when the valve shaft 3 is pressed downward and compressed.

このように、コイルバネ５４の座りが悪い場合には、図５（Ｂ）のように、弁閉時に弁体１２が傾いた姿勢で弁座１３に当接したり、弁体１２が弁座１３に当接する途中で左右に揺れ動いてしまう。   Thus, when the sitting of the coil spring 54 is poor, as shown in FIG. 5 (B), the valve body 12 is brought into contact with the valve seat 13 in an inclined posture when the valve is closed, or the valve body 12 is brought into contact with the valve seat 13. It swings to the left and right during contact.

このような場合には、弁軸３の下方に配置された弁体１２が弁座１３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１２と弁座１３とにより流量制御を正確に行う上で問題が生じる。   In such a case, there has been a problem that the valve body 12 disposed below the valve shaft 3 is in contact with the valve seat 13 obliquely or in an unstable posture. In such a case, a problem arises when the flow rate is accurately controlled by the valve body 12 and the valve seat 13.

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に係る電動弁１０は、
雌ネジ部（６ｄ）と軸受部（６ｅ）が形成され、ロータ（２）の回転に対して回転不能であり、かつ上下方向に移動不能な弁軸ホルダ（６）と、
外周部に、雄ネジ部（４ａ）と前記軸受部（６ｅ）によって案内される軸部分（４ｂ）とが形成され、前記ロータ（２）と一体的に回転するとともに、その回転に伴って上下方向に移動する弁軸（４）と、
前記弁軸（４）の雄ネジ部（４ａ）と前記弁軸ホルダ（６）の雌ネジ部（６ｄ）とから構成されるネジ送り機構（Ａ）と、
前記弁軸（４）に対して軸方向に移動可能な状態で前記弁軸（４）の下端部に抜け止めされているとともに、弁体（３２）が一体的に具備された筒状の弁ホルダ（２５）と、
前記弁ホルダ（２５）の上下方向の移動を案内する弁軸ホルダ室（８３）と、
前記弁ホルダ（２５）内に設けられ、閉弁時に前記弁体（３２）を弁閉方向に付勢するコイルバネ（２７）と、
前記弁軸ホルダ（６）が回転不能に、かつそれ自身上下方向に移動不能に固定されており、軸方向の下部に設けられた入出力ポート（１４）に、弁座部（２１）が設けられ、内部に弁室（７０ａ）が画成された弁室形成部材（７０）と、を備えた電動弁（１０）であって、
前記軸部分（４ｂ）が軸方向において前記雄ネジ部（４ａ）と前記弁ホルダ（２５）との間に位置し、
前記軸受部（６ｅ）が軸方向において前記雌ネジ部（６ｄ）と前記弁軸ホルダ室（８３）との間に位置し、
前記ネジ送り機構（Ａ）が前記弁軸ホルダ室（８３）に接しておらず、かつ前記弁軸ホルダ（６）の前記ロータ（２）側に位置し、
前記弁軸ホルダ（６）は一体形成されたものであるとともに、
前記弁軸（４）の雄ネジ部（４ａ）の外径をＣ１、前記コイルバネ（２７）の下端側のバネ受け部（３２ａ）に対する着座部分の内径をＣ２としたとき、
Ｃ１＜Ｃ２に設定されていることを特徴とする。 To achieve the above object, the motor-operated valve 10 according to the present invention includes:
A female shaft portion (6d) and a bearing portion (6e) are formed, a valve shaft holder (6) that cannot rotate with respect to the rotation of the rotor (2) and cannot move in the vertical direction;
A male threaded portion (4a) and a shaft portion (4b) guided by the bearing portion (6e) are formed on the outer peripheral portion, and rotate integrally with the rotor (2). A valve stem (4) moving in the direction;
A screw feed mechanism (A) composed of a male threaded portion (4a) of the valve stem (4) and a female threaded portion (6d) of the valve stem holder (6);
A cylindrical valve which is prevented from coming off at the lower end of the valve shaft (4) so as to be movable in the axial direction with respect to the valve shaft (4) and is integrally provided with a valve body (32). A holder (25);
A valve shaft holder chamber (83) for guiding the vertical movement of the valve holder (25);
A coil spring (27) provided in the valve holder (25) for biasing the valve body (32) in the valve closing direction when the valve is closed;
The valve shaft holder (6) is fixed so that it cannot rotate and cannot move in the vertical direction, and a valve seat portion (21) is provided in an input / output port (14) provided at the lower portion in the axial direction. A valve chamber forming member (70) in which a valve chamber (70a) is defined, and a motor-operated valve (10),
The shaft portion (4b) is positioned between the male screw portion (4a) and the valve holder (25) in the axial direction;
The bearing portion (6e) is located between the female screw portion (6d) and the valve shaft holder chamber (83) in the axial direction,
The screw feed mechanism (A) is not in contact with the valve shaft holder chamber (83) and is located on the rotor (2) side of the valve shaft holder (6);
The valve shaft holder (6) is integrally formed,
When the outer diameter of the male screw portion (4a) of the valve shaft (4) is C1, and the inner diameter of the seating portion with respect to the spring receiving portion (32a) on the lower end side of the coil spring (27) is C2,
C1 <C2 is set.

このような構成の電動弁によれば、コイルバネの座屈が安定することから、弁体を弁座に対して傾かせることなく着座させることができる。これにより、弁体の弁座に対する着座安定性が向上する。これにより、着座時の流体の漏れを減少させることができ、加えて弁部の耐久性を向上させることができる。   According to the electric valve having such a configuration, since the buckling of the coil spring is stabilized, the valve body can be seated without being inclined with respect to the valve seat. Thereby, the seating stability with respect to the valve seat of a valve body improves. Thereby, the leakage of the fluid at the time of seating can be reduced, and in addition, the durability of the valve portion can be improved.

また、本発明では、
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が一定であることが好ましい。 In the present invention,
An inner diameter D1 of the female screw portion 6d of the valve shaft holder 6 is set smaller than an 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 preferably 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る。
さらに、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。 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 control can be accurately performed.
Furthermore, in the present invention, a press-fit portion 34 that is press-fitted into the inner peripheral side portion of the valve chamber forming member 70 is provided on the outer peripheral side portion of the valve shaft holder 6,
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。
ここで、本発明では、前記弁軸４の雄ネジ部の有効径が２〜３ｍｍであっても良い。
このように本発明は、弁軸４の小径化に対応することができる。 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.
Here, in this invention, the effective diameter of the external thread part of the said valve shaft 4 may be 2-3 mm.
As described above, the present invention can cope with the diameter reduction of the valve shaft 4.

本発明に係る電動弁によれば、コイルバネの座屈が安定することから、弁体を弁座に対して傾かせることなく着座させることができ、これにより、弁体の弁座に対する着座安定性が向上する。また、着座時の流体の漏れを減少させることができ、加えて弁部の耐久性を向上させることができる。   According to the motor-operated valve of the present invention, since the buckling of the coil spring is stable, the valve body can be seated without being inclined with respect to the valve seat, and thereby, the seating stability of the valve body with respect to the valve seat is improved. Will improve. In addition, fluid leakage at the time of sitting can be reduced, and in addition, durability of the valve portion can be improved.

また、本発明に係る電動弁は、弁閉時の密閉性が向上しての縮小化に寄与することができ、例えば、弁軸の雄ネジ部の有効径が２〜３ｍｍであっても良好に適用することができる。   In addition, the motor-operated valve according to the present invention can contribute to the reduction of the sealing performance when the valve is closed. For example, the effective diameter of the male screw portion of the valve shaft is 2 to 3 mm. Can be applied to.

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は図１に示した弁軸と弁軸ホルダとの組付態様を拡大して示す概略図である。FIG. 2 is an enlarged schematic view showing an assembly mode of the valve shaft and the valve shaft holder shown in FIG. 図３（Ａ）、（Ｂ）は、図１に示した弁軸と弁軸ホルダとの組付態様を示す断面図である。3 (A) and 3 (B) are cross-sectional views showing how the valve shaft and the valve shaft holder shown in FIG. 1 are assembled. 図４（Ａ）、（Ｂ）は図１に示した電動弁のコイルバネの形状を示すための概略断面図である。4A and 4B are schematic cross-sectional views for illustrating the shape of the coil spring of the motor-operated valve shown in FIG. 図５（Ａ）は従来の電動弁の断面図、図５（Ｂ）は図５（Ａ）の一部拡大図である。FIG. 5A is a cross-sectional view of a conventional motor-operated valve, and FIG. 5B is a partially enlarged view of FIG. 図６（Ａ）、（Ｂ）は、図５（Ａ）、（Ｂ）に示した従来の電動弁の弁軸と弁軸ホルダとの組付態様を拡大して示す概略図である。6 (A) and 6 (B) are schematic views showing, in an enlarged manner, the manner in which the valve shaft and the valve shaft holder of the conventional electric valve shown in FIGS. 5 (A) and 5 (B) are assembled. 図７（Ａ）は、従来の電動弁におけるコイルバネと弁軸との関係を示す断面図、図７（Ｂ）は、図７（Ａ）に示したコイルバネの外形を示す概略図である。FIG. 7A is a cross-sectional view showing the relationship between a coil spring and a valve shaft in a conventional motor-operated valve, and FIG. 7B is a schematic view showing the outer shape of the coil spring shown in FIG. 7A.

以下に、図面を参照しながら、本発明の好ましい実施形態について説明する。
図１は、本発明の好ましい実施形態の電動弁を示した断面図で、図２は、図１に示した電動弁における弁軸と弁軸ホルダとの組付け態様を示す概略図である。 Hereinafter, preferred embodiments 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, and FIG. 2 is a schematic diagram showing an assembly mode of a valve shaft and a valve shaft holder in the motor-operated valve shown in FIG.

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。
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。 In the present specification, “upper” or “lower” is defined in the state of FIG.
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.

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が設けられている。   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 provided above the input / output port 14 of the valve chamber forming member 70.

なお、この弁座部２１は、ケース６９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 69, 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。この弁軸ホルダ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 of the valve chamber forming member 70, a cylindrical valve shaft holder 6 having a through hole formed therein forms a valve chamber via the flange portion 6f. It is fixed so as not to rotate relative to the member 70. The valve shaft holder 6 is a single member that is integrally formed, and is preferably integrally formed of an appropriate resin. The valve shaft holder 6 has a function of suppressing the inclination of the valve shaft 4 described later.

上記弁軸ホルダ６は、上部側の筒状小径部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 small-diameter 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. Part 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の筒状小径部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 small diameter 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、筒状小径部６ａの内周側上部開口部６ｇから所定の深さまで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 side upper opening 6g of the cylindrical small diameter part 6a to a predetermined depth, and a screw groove is formed below the female screw part 6d. A bearing portion 6e that is not formed 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を挟んで下方側に、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 of the male screw portion 4a with the reduced diameter portion 4c interposed therebetween.

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、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. A compressed coil spring 27 and a spring receiver 35 are accommodated in the valve holder 25. 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、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の下端部に設けられた弁体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 electric 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. The valve body 32 provided at the lower end 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。
また、弁座部２１の開口径は０．５〜４．５ｍｍであり、ネジ送り機構Ａの螺合長さＬは、２〜１０ｍｍである。
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。 In addition, the effective diameter of the external thread part of the valve shaft 4 in this Embodiment is 2-3 mm.
Moreover, the opening diameter of the valve seat part 21 is 0.5-4.5 mm, and the screwing length L of the screw feed mechanism A is 2-10 mm.
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が弁座形成部材７０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 forming member 70, 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 is moved. The valve shaft 4 comes into contact with the stopper portion 6h of the valve shaft holder 6, and the lowering of the valve shaft 4 is forcibly stopped, and the operation ends in the posture shown in 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.

上記のような動作を行う本実施形態の電動弁１０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、以下のような構成が採用されている。   In the motor-operated valve 10 of the present embodiment that performs the operation as described above, the valve body 32 disposed below the valve shaft 4 is always brought into contact with the valve seat portion 21 in a stable posture as follows. Configuration is adopted.

すなわち、弁軸ホルダ６の軸受部６ｅは、筒状小径部６ａの下端部側に設けられており、弁軸４の雄ネジ部４ａは、筒状小径部６ａの上部側に設けられている。
このように、軸受部６ｅが筒状小径部６ａの下端部側に設けられ、かつ弁軸４の雄ネジ部４ａが筒状小径部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 small diameter portion 6a, and the male screw portion 4a of the valve shaft 4 is provided on the upper side of the cylindrical small diameter portion 6a. .
Thus, when the bearing portion 6e is provided on the lower end portion side of the cylindrical small diameter portion 6a and the male screw portion 4a of the valve shaft 4 is provided on the upper side of the cylindrical small diameter portion 6a, the valve shaft 4 The swing width 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、Ｄ１＜Ｄ２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。 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 D1 <D2, the screwing length L of the screw feeding mechanism A can be always set to a constant length.

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３（Ａ）と、弁開時の状態を示す図３（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３（Ａ）のように、弁軸４が最大限下方に移動したときにも、図３（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. 3A showing the state when the valve is closed and in FIG. 3B 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. 3A, 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.

また、このような構成の電動弁１０では、図４に示したように、弁軸４の雄ネジ部４ａの外径Ｃ１は、コイルバネ２７の下端側のバネ受け部３２ａに対する着座部分の内径Ｃ２より小さく設定されている。このようにＣ１＜Ｃ２に設定すると、弁軸４の振れ幅が少なくなる。   In the motor-operated valve 10 having such a configuration, as shown in FIG. 4, the outer diameter C1 of the male screw portion 4a of the valve shaft 4 is equal to the inner diameter C2 of the seating portion with respect to the spring receiving portion 32a on the lower end side of the coil spring 27. It is set smaller. In this way, when C1 <C2, the deflection of the valve shaft 4 is reduced.

また、Ｃ１＜Ｃ２に設定すると、仮想空間Ｂの重心位置Ｇは、図７の逆円錐台形状の場合に比べて低くなり、バネの座りが良好になる。
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に当接または離反するので、流量調整を正確に行うことができる。 When C1 <C2, the center of gravity G of the virtual space B is lower than that of the inverted truncated cone shape shown in FIG.
Therefore, since the valve body 32 shown in FIG. 1 always contacts or separates from the valve seat portion 21 in a stable posture, the flow rate can be adjusted accurately.

また、電動弁１０では、ネジ送り機構Ａの位置が、弁軸ホルダ室８３に接しておらず、弁軸ホルダ室８３の上方に位置している。
したがって、本実施形態の場合には、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。 Further, in the motor-operated valve 10, the position of the screw feed mechanism A is not in contact with the valve shaft holder chamber 83 and is positioned above the valve shaft holder chamber 83.
Therefore, in the case of this embodiment, even if dust etc. are mixed in the fluid, the screw feed mechanism A is prevented from being bitten. Thereby, the adjustment of the valve opening degree does not cause trouble.

コイルバネ２７の座りが良い場合には、以下のような効果を奏する。
すなわち、コイルバネ２７の座りが良いと、図１のように、弁閉時に弁体３２が傾いたり弁体３２が左右に揺れ動いたりすることがなく、安定した姿勢で弁体３２を着座させることができる。したがって、流体の漏れなどを防止することができる。 When the coil spring 27 sits well, the following effects are obtained.
That is, when the coil spring 27 is satisfactorily seated, as shown in FIG. 1, the valve body 32 does not tilt or the valve body 32 does not swing left and right when the valve is closed, and the valve body 32 can be seated in a stable posture. it can. Therefore, fluid leakage and the like can be prevented.

したがって、このようなコイルバネ２７を備えた電動弁１０では、弁体３２を常に安定した姿勢で弁座部２１に当接または離反させることができるので、流量調整を正確に行うことができる。   Therefore, in the motor-operated valve 10 provided with such a coil spring 27, the valve body 32 can always be brought into contact with or separated from the valve seat portion 21 in a stable posture, so that the flow rate can be adjusted accurately.

以上、本発明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。
例えば、上記実施形態では、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の係止手段は、他の構成であっても良い。 As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to this.
For example, in the above 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. Other configurations may be used.

また、本発明は、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適用が可能であるが、勿論それ以上の径に適用可能である。
さらに、弁座部２１の開口径は、０．５〜４．５ｍｍの場合に有効に可能であるが、勿論、それ以外の径にも適用可能である。 Further, the present invention can be applied to the case where the effective diameter of the male screw portion 4a of the valve shaft 4 is a small diameter such as 2 to 3 mm, but it is of course applicable to a diameter larger than that.
Furthermore, the opening diameter of the valve seat portion 21 can be effectively applied when the diameter is 0.5 to 4.5 mm, but, of course, it can be applied to other diameters.

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 筒状小径部
６ｂ 筒状大径部
６ｃ 下端部
６ｄ 雄ネジ部
６ｅ 軸受部
６ｆ フランジ部
６ｇ 上端開口部
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
３２ａ バネ受け部
３３ ブッシュ部材
３７ 第２の継手
３８ 第１の継手
５０ 弁軸組立体
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 2 Rotor 2a Stopper portion 4 Valve shaft 4a Male thread portion 4b Shaft portion 4c Reduced diameter portion 6 Valve shaft holder 6a Tubular small diameter portion 6b Tubular large diameter portion 6c Lower end portion 6d Male thread portion 6e Bearing portion 6f Flange portion 6g Upper end opening Portion 6h Stopper 10 Motorized valve 14 Input / output port 21 Valve seat 25 Valve holder 27 Coil spring 32 Valve body 32a Spring receiving portion 33 Bush member 37 Second joint 38 First joint 50 Valve shaft assembly 60 Case 60a Lower end 70 Valve chamber forming member 70a Valve chamber 70b Upper end 83 Valve shaft holder chamber A Screw feed mechanism

Claims (4)

雌ネジ部（６ｄ）と軸受部（６ｅ）が形成され、ロータ（２）の回転に対して回転不能であり、かつ上下方向に移動不能な弁軸ホルダ（６）と、
外周部に、雄ネジ部（４ａ）と前記軸受部（６ｅ）によって案内される軸部分（４ｂ）とが形成され、前記ロータ（２）と一体的に回転するとともに、その回転に伴って上下方向に移動する弁軸（４）と、
前記弁軸（４）の雄ネジ部（４ａ）と前記弁軸ホルダ（６）の雌ネジ部（６ｄ）とから構成されるネジ送り機構（Ａ）と、
前記弁軸（４）に対して軸方向に移動可能な状態で前記弁軸（４）の下端部に抜け止めされているとともに、弁体（３２）が一体的に具備された筒状の弁ホルダ（２５）と、
前記弁ホルダ（２５）の上下方向の移動を案内する弁軸ホルダ室（８３）と、
前記弁ホルダ（２５）内に設けられ、閉弁時に前記弁体（３２）を弁閉方向に付勢するコイルバネ（２７）と、
前記弁軸ホルダ（６）が回転不能に、かつそれ自身上下方向に移動不能に固定されており、軸方向の下部に設けられた入出力ポート（１４）に、弁座部（２１）が設けられ、内部に弁室（７０ａ）が画成された弁室形成部材（７０）と、を備えた電動弁（１０）であって、
前記軸部分（４ｂ）が軸方向において前記雄ネジ部（４ａ）と前記弁ホルダ（２５）との間に位置し、
前記軸受部（６ｅ）が軸方向において前記雌ネジ部（６ｄ）と前記弁軸ホルダ室（８３）との間に位置し、
前記ネジ送り機構（Ａ）が前記弁軸ホルダ室（８３）に接しておらず、かつ前記弁軸ホルダ（６）の前記ロータ（２）側に位置し、
前記弁軸ホルダ（６）は一体形成されたものであるとともに、
前記弁軸（４）の雄ネジ部（４ａ）の外径をＣ１、前記コイルバネ（２７）の下端側のバネ受け部（３２ａ）に対する着座部分の内径をＣ２としたとき、
Ｃ１＜Ｃ２に設定されていることを特徴とする電動弁。 A female shaft portion (6d) and a bearing portion (6e) are formed, a valve shaft holder (6) that cannot rotate with respect to the rotation of the rotor (2) and cannot move in the vertical direction;
A male threaded portion (4a) and a shaft portion (4b) guided by the bearing portion (6e) are formed on the outer peripheral portion, and rotate integrally with the rotor (2). A valve stem (4) moving in the direction;
A screw feed mechanism (A) composed of a male threaded portion (4a) of the valve stem (4) and a female threaded portion (6d) of the valve stem holder (6);
A cylindrical valve which is prevented from coming off at the lower end of the valve shaft (4) so as to be movable in the axial direction with respect to the valve shaft (4) and is integrally provided with a valve body (32). A holder (25);
A valve shaft holder chamber (83) for guiding the vertical movement of the valve holder (25);
A coil spring (27) provided in the valve holder (25) for biasing the valve body (32) in the valve closing direction when the valve is closed;
The valve shaft holder (6) is fixed so that it cannot rotate and cannot move in the vertical direction, and a valve seat portion (21) is provided in an input / output port (14) provided at the lower portion in the axial direction. A valve chamber forming member (70) in which a valve chamber (70a) is defined, and a motor-operated valve (10),
The shaft portion (4b) is positioned between the male screw portion (4a) and the valve holder (25) in the axial direction;
The bearing portion (6e) is located between the female screw portion (6d) and the valve shaft holder chamber (83) in the axial direction,
The screw feed mechanism (A) is not in contact with the valve shaft holder chamber (83) and is located on the rotor (2) side of the valve shaft holder (6);
The valve shaft holder (6) is integrally formed,
When the outer diameter of the male screw portion (4a) of the valve shaft (4) is C1, and the inner diameter of the seating portion with respect to the spring receiving portion (32a) on the lower end side of the coil spring (27) is C2,
A motor-operated valve characterized in that C1 <C2. 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請求項１に記載の電動弁。 An inner diameter (D1) of the female screw portion (6d) of the valve shaft holder (6) is set smaller than an 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, The motor-operated valve according to claim 1, wherein the screwing length (L) of the screw feeding 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または２に記載の電動弁。 On the outer peripheral side portion of the valve shaft holder (6), a press-fit portion (34) to be press-fitted into the inner peripheral side portion of the valve chamber forming member (70) is provided.
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 or 2, wherein 前記弁軸（４）の雄ネジ部（４ａ）の外径が２〜３ｍｍであることを特徴とする請求項１〜３のいずれかに記載の電動弁。   The motor-operated valve according to any one of claims 1 to 3, wherein an outer diameter of the male thread portion (4a) of the valve shaft (4) is 2 to 3 mm.
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