JP2019190514A - Motor valve and refrigeration cycle system - Google Patents

Motor valve and refrigeration cycle system Download PDF

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JP2019190514A
JP2019190514A JP2018081425A JP2018081425A JP2019190514A JP 2019190514 A JP2019190514 A JP 2019190514A JP 2018081425 A JP2018081425 A JP 2018081425A JP 2018081425 A JP2018081425 A JP 2018081425A JP 2019190514 A JP2019190514 A JP 2019190514A
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valve
valve body
motor
rotor
port
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JP7066496B2 (en
Inventor
一也 小林
Kazuya Kobayashi
一也 小林
大樹 中川
Daiki Nakagawa
大樹 中川
拓也 松尾
Takuya Matsuo
拓也 松尾
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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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
    • 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
    • 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
    • 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Lift Valve (AREA)
  • Details Of Valves (AREA)

Abstract

To provide a motor valve capable of maintaining quietness accurately, and a refrigeration cycle system using the motor valve.SOLUTION: A motor valve is configured to convert the rotational movement of a rotor accommodated in the inner periphery of a case into a linear movement by a screw feed mechanism of a male screw member and a female screw member, to move a valve disc accommodated in a valve body on the basis of the linear motion in a valve central axis direction, which is the central axis of the valve disc. The lower end of the inner peripheral surface of a storage chamber of a valve shaft holder is located on the valve central axis direction side with respect to a virtual line passing through the inner diameter of the rotor-side end part of a second valve port and the second valve port side end part of a portion having the maximum outer diameter in the valve disc part protruding to the second valve port side from the lower end of the inner peripheral surface.SELECTED DRAWING: Figure 3

Description

本発明は、電動弁、および該電動弁を用いた冷凍サイクルシステムに関する。   The present invention relates to a motor-operated valve and a refrigeration cycle system using the motor-operated valve.

従来より、図８に示すような構造を有する電動弁が知られている（たとえば、特許文献１参照）。すなわち、ステッピングモータが駆動してロータ１０３が回転すると、雌ネジ１３１ａと雄ネジ１２１ａのネジ送り作用により、弁体１１４が弁体１１４の中心軸である弁中心軸Ｌ方向に移動する。これにより、弁ポート１３０ｂの開度調整がなされ、管継手１１１から流入して管継手１１２へ流出する流体の流量、または、管継手１１２から流入して管継手１１１へ流出する流体の流量が制御される。   Conventionally, a motor-operated valve having a structure as shown in FIG. 8 is known (see, for example, Patent Document 1). That is, when the stepping motor is driven and the rotor 103 rotates, the valve body 114 moves in the valve central axis L direction, which is the central axis of the valve body 114, by the screw feeding action of the female screw 131a and the male screw 121a. Thereby, the opening degree of the valve port 130b is adjusted, and the flow rate of the fluid that flows in from the pipe joint 111 and flows out to the pipe joint 112 or the flow rate of the fluid that flows in from the pipe joint 112 and flows out to the pipe joint 111 is controlled. Is done.

ここで、各種流体の流量制御を行うに当たっては、流体通過音が発生するという問題があるため、静音化が要求される。また、冷媒を用いた家庭用空調機や業務用空調機の冷凍サイクルの室内機において、電動弁１００にて冷媒流量を制御する場合は、弁ポート１３０ｂ通過前後で液冷媒が気液混合二相流となるため、特に、多彩な冷媒状態、運転状況でも静音性を発揮することが要求される。   Here, when performing flow control of various fluids, there is a problem that a fluid passing sound is generated, so that noise reduction is required. Further, in the indoor unit of a refrigeration cycle of a home air conditioner or a commercial air conditioner using a refrigerant, when the refrigerant flow rate is controlled by the motor-operated valve 100, the liquid refrigerant is gas-liquid mixed two-phase before and after passing through the valve port 130b. Therefore, it is required to exhibit quietness even in various refrigerant states and operating conditions.

特開２０１６−０８９８７０号公報JP 2006-089870 A

ところで、上述の電動弁１００は、図示しない流体配管に管継手１１１、管継手１１２を介して固定され、管継手１１１の中心線と管継手１１２の中心線が垂直に交わるアングル型の構造を有している。このようなアングル型の電動弁１００において、流体は双方向から流れる。すなわち、流体は、管継手１１１から弁室１２１、弁ポート１３０ｂを介して管継手１１２に正方向に流れる場合と、管継手１１２から弁ポート１３０ｂ、弁室１２１を介して管継手１１１に逆方向に流れる場合とを有する。   By the way, the motor-operated valve 100 described above is fixed to a fluid pipe (not shown) via a pipe joint 111 and a pipe joint 112, and has an angle type structure in which the center line of the pipe joint 111 and the center line of the pipe joint 112 intersect perpendicularly. is doing. In such an angle-type motor-operated valve 100, the fluid flows in both directions. That is, the fluid flows in the forward direction from the pipe joint 111 to the pipe joint 112 via the valve chamber 121 and the valve port 130b, and in the reverse direction from the pipe joint 112 to the pipe joint 111 via the valve port 130b and the valve chamber 121. The case where it flows into.

ここで、図９に示すように、流体が逆方向に流れた場合、流体は、弁ポート１３０ｂを通過した後、弁体１１４、弁ガイド１１８に沿って上方に流れ、弁ガイド１１８と雌ネジ部材１３１との間のクリアランス１３３の下端開口部１３３ａに流入する（円Ｔ内参照）。かかる場合において、クリアランス１３３の下端開口部１３３ａに流入した流体は弁体部１２０を振動させることになる。この振動による音が発生すると、電動弁１００の静音性を維持することが困難になる。   Here, as shown in FIG. 9, when the fluid flows in the opposite direction, the fluid flows upward along the valve body 114 and the valve guide 118 after passing through the valve port 130b, and the valve guide 118 and the female screw It flows into the lower end opening 133a of the clearance 133 between the member 131 (refer to the inside of the circle T). In such a case, the fluid flowing into the lower end opening 133a of the clearance 133 causes the valve body 120 to vibrate. When sound due to this vibration is generated, it becomes difficult to maintain the quietness of the motor-operated valve 100.

本発明の目的は、的確に静音性を維持することができる電動弁、および該電動弁を用いた冷凍サイクルシステムを提供することである。   An object of the present invention is to provide a motor-operated valve capable of accurately maintaining silence and a refrigeration cycle system using the motor-operated valve.

［１］本発明の電動弁は、
ケースの内周に収容されたロータの回転運動を、雄ネジ部材と雌ネジ部材とのネジ送り機構により直線運動に変換し、この直線運動に基づいて弁本体内に収容された弁体を前記弁体の中心軸である弁中心軸方向に移動させる電動弁であって、
前記弁本体内に形成された空間である弁室と、
前記弁本体の側面に設けられ、前記弁室側の出入口となる第１弁ポートと、
前記弁体の直下において前記弁本体と同軸方向に設けられ、前記弁体が近接または離間可能な第２弁ポートと、
前記第２弁ポート側に前記弁体が固定されると共に前記弁中心軸方向に摺動可能に配置された弁ガイド、および前記弁体から成る弁体部と、
前記弁体部が前記弁中心軸方向に摺動する筒状の収容室が内部に形成された弁軸ホルダと
を備え、
前記収容室の内周面の前記第２弁ポート側端部である内周面下端が、
前記第２弁ポートの前記ロータ側の端部の内径と、
前記内周面下端よりも前記第２弁ポート側に突出した前記弁体部において、外径が最大となる部分の前記第２弁ポート側の端部と
を通る仮想線よりも前記弁中心軸方向側に位置することを特徴とする。 [1] The motor operated valve of the present invention is
The rotational motion of the rotor accommodated in the inner periphery of the case is converted into a linear motion by a screw feed mechanism of a male screw member and a female screw member, and the valve body accommodated in the valve body based on the linear motion is An electric valve that moves in the direction of the valve center axis, which is the center axis of the valve body,
A valve chamber which is a space formed in the valve body;
A first valve port provided on a side surface of the valve main body and serving as an inlet / outlet on the valve chamber side;
A second valve port that is provided directly below the valve body in the same direction as the valve body, and in which the valve body can approach or separate;
A valve guide fixed to the second valve port side and slidably arranged in the valve central axis direction; and a valve body portion including the valve body;
A valve shaft holder in which a cylindrical storage chamber in which the valve body portion slides in the valve central axis direction is formed;
The lower end of the inner peripheral surface which is the second valve port side end portion of the inner peripheral surface of the storage chamber,
An inner diameter of the end of the second valve port on the rotor side;
In the valve body portion protruding to the second valve port side from the lower end of the inner peripheral surface, the valve central axis is more than the imaginary line passing through the end portion on the second valve port side of the portion having the maximum outer diameter. It is located on the direction side.

このように、弁軸ホルダの収容室の内周面下端が仮想線の内側に位置することにより、第２弁ポートから弁室内に向けて逆方向に流体を流した場合に、弁体部に当たった流体の流れ方向を弁ガイドと弁軸ホルダとの間に形成されるクリアランスの下端開口部から逸らすことができる。よって、クリアランスの下端開口部に流体が流入することが抑制され、クリアランスの下端開口部に流入した流体による弁ガイドの振動を低減することができる。また、弁体が弁ガイドに固定されることにより、流体によって弁体が弁ガイドの中で振動することを抑制できる。したがって、弁ガイドが振動して生じる騒音を緩和することができ、的確に静音性を維持することができる。   As described above, the lower end of the inner peripheral surface of the accommodating chamber of the valve shaft holder is located inside the imaginary line, so that when the fluid flows in the opposite direction from the second valve port toward the valve chamber, The direction of flow of the contacted fluid can be diverted from the lower end opening of the clearance formed between the valve guide and the valve shaft holder. Therefore, the fluid is suppressed from flowing into the lower end opening of the clearance, and the vibration of the valve guide due to the fluid flowing into the lower end opening of the clearance can be reduced. Moreover, it can suppress that a valve body vibrates in a valve guide with a fluid by fixing a valve body to a valve guide. Therefore, noise generated by the vibration of the valve guide can be mitigated, and quietness can be accurately maintained.

［２］また、本発明の電動弁は、
前記弁体が前記弁体の可動可能ないずれの位置にあっても、
前記収容室の内周面下端が前記仮想線よりも前記弁中心軸方向側に位置することを特徴とする。 [2] The motor-operated valve of the present invention is
Even if the valve body is in any movable position of the valve body,
The lower end of the inner peripheral surface of the storage chamber is located on the valve center axis direction side of the virtual line.

これにより、流体を逆方向に流した場合に、弁体と第２弁ポートの間の開き具合であるすべての弁開度において、弁室内を上昇して弁体部に当たった流体の流れ方向をクリアランスの下端開口部から逸らすことができる。よって、さらに的確にクリアランスの下端開口部に流体が流入することを抑制することができる。   Thus, when the fluid is flowed in the opposite direction, the flow direction of the fluid that has risen in the valve chamber and hits the valve body portion at all valve openings that are the degree of opening between the valve body and the second valve port. Can be deflected from the lower end opening of the clearance. Therefore, it is possible to suppress the fluid from flowing into the lower end opening of the clearance more accurately.

［３］また、本発明の電動弁は、
前記弁体は、外周径が前記ロータ側に向かって大きくなるテーパーを形成する傾斜外周部を備え、
前記弁軸ホルダは、前記第２弁ポート側に延設され、外周径が前記ロータ側に向かって大きくなるテーパーを形成する延設部を備え、
前記延設部の前記第２弁ポート側の下端部は、前記弁軸ホルダの中で最も外径が小さく形成され、
前記傾斜外周部のテーパー角度は、前記延設部のテーパー角度よりも大きく、かつ、０°よりも大きく１８０°よりも小さいことを特徴とする。 [3] The motor-operated valve of the present invention is
The valve body includes an inclined outer peripheral portion that forms a taper whose outer peripheral diameter increases toward the rotor side,
The valve shaft holder includes an extending portion that extends toward the second valve port and forms a taper whose outer diameter increases toward the rotor.
The lower end portion of the extending portion on the second valve port side is formed with the smallest outer diameter among the valve shaft holders,
The taper angle of the inclined outer peripheral portion is larger than the taper angle of the extending portion, and is larger than 0 ° and smaller than 180 °.

このように、弁軸ホルダや弁体にテーパーを設けることにより、第２弁ポートから弁室内に向けて逆方向に流体を流した場合に、流体を外側に流しクリアランスの下端開口部から逸れるように誘導することができる。また、傾斜外周部のテーパー角度を延設部のテーパー角度よりも大きくすることにより、上昇中に傾斜外周部に当たった流体の流れが、クリアランスから外側に離れる方向に変化し、更にその流れが、延設部の外周面よりも外側に誘導される。また、弁軸ホルダの下端部外径が最も小さくなるように弁軸ホルダを形成することにより、クリアランスの下端開口部に流体が流入することを抑制することができる。   In this way, by providing a taper on the valve shaft holder and the valve body, when the fluid flows in the opposite direction from the second valve port toward the valve chamber, the fluid flows outward and deviates from the lower end opening of the clearance. Can be guided to. In addition, by making the taper angle of the inclined outer peripheral part larger than the taper angle of the extending part, the flow of the fluid that hits the inclined outer peripheral part during the rise changes in a direction away from the clearance, and the flow further increases. In addition, it is guided outside the outer peripheral surface of the extending portion. Further, by forming the valve shaft holder so that the outer diameter of the lower end portion of the valve shaft holder is minimized, it is possible to suppress the fluid from flowing into the lower end opening of the clearance.

［４］また、本発明の電動弁は、
前記弁体が、
前記第２弁ポートと近接する部分であるニードル部と、
前記ニードル部の基端の外周に位置する環状の環状平面部と
を備えることを特徴とする。 [4] Moreover, the motor-operated valve of the present invention includes:
The valve body is
A needle portion that is a portion adjacent to the second valve port;
And an annular flat surface portion located on the outer periphery of the proximal end of the needle portion.

これにより、環状平面部に衝突した流体によって弁体が上方に付勢され、ネジ送り機構における雄ネジと雌ネジとのネジ山の接触面を一定に保つことができネジガタが生じることが抑制される。さらに、流体が環状平面部に当たることで、環状平面部の外径方向に流れを変化させ、流体がクリアランスの下端開口部に流入して騒音が発生することが抑制されるため、的確に電動弁の静音性を維持することができる。   As a result, the valve body is urged upward by the fluid that has collided with the annular flat surface portion, and the contact surface of the screw thread between the male screw and the female screw in the screw feed mechanism can be kept constant, and the occurrence of screw play is suppressed. The Furthermore, since the fluid strikes the annular flat surface portion, the flow is changed in the outer diameter direction of the annular flat surface portion, and the fluid is suppressed from flowing into the lower end opening of the clearance to generate noise. The quietness of the sound can be maintained.

［５］また、本発明の冷凍サイクルシステムは、
圧縮機、凝縮器、膨張弁、および蒸発器を含む冷凍サイクルシステムであって、上述の電動弁を前記膨張弁として用いることを特徴とする。 [5] Further, the refrigeration cycle system of the present invention includes:
A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the motor-operated valve is used as the expansion valve.

本発明によれば、的確に静音性を維持することができる電動弁、および該電動弁を用いた冷凍サイクルシステムを提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the motor-driven valve which can maintain silence appropriately exactly, and the refrigerating-cycle system using this motor-operated valve can be provided.

実施の形態に係る電動弁の概略断面図である。It is a schematic sectional drawing of the motor operated valve which concerns on embodiment. 実施の形態に係る電動弁の要部拡大図である。It is a principal part enlarged view of the motor operated valve which concerns on embodiment. 実施の形態に係る電動弁において、弁体部が最も弁座部に近接した状態における仮想線を示す図である。In the motor-operated valve which concerns on embodiment, it is a figure which shows the virtual line in the state in which the valve body part was closest to the valve seat part. 実施の形態に係る電動弁において、弁体部が最も弁座部から離間した状態における仮想線を示す図である。In the motor operated valve which concerns on embodiment, it is a figure which shows the virtual line in the state in which the valve body part was most spaced apart from the valve seat part. 実施の形態に係る電動弁において、弁体部が最も弁座部に近接した状態における仮想円錐を示す図である。In the motor-operated valve which concerns on embodiment, it is a figure which shows the virtual cone in the state in which the valve body part was closest to the valve seat part. 実施の形態に係る電動弁において、弁体部が最も弁座部から離間した状態における仮想円錐を示す図である。In the motor operated valve which concerns on embodiment, it is a figure which shows the virtual cone in the state in which the valve body part was most separated from the valve seat part. 実施の形態に係る電動弁において、弁軸ホルダの延設部の外周に形成されたテーパー、および弁体に形成された傾斜外周部のテーパー角度を示す図である。In the motor-operated valve which concerns on embodiment, it is a figure which shows the taper angle of the taper formed in the outer periphery of the extension part of a valve-shaft holder, and the inclination outer peripheral part formed in the valve body. 従来の電動弁の概略断面図である。It is a schematic sectional drawing of the conventional motor operated valve. 従来の電動弁の要部拡大図である。It is a principal part enlarged view of the conventional motor operated valve.

以下、図面を参照して、本発明の実施の形態に係る電動弁について説明する。図１は、実施の形態に係る電動弁２を示した概略断面図である。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。すなわち、ロータ４は弁体１７より上方に位置している。   Hereinafter, an electric valve according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing a motor-operated valve 2 according to an embodiment. In the present specification, “upper” or “lower” is defined in the state of FIG. That is, the rotor 4 is positioned above the valve body 17.

この電動弁２では、金属により筒状のカップ形状をなすケース６０の開口側の下方に、弁本体３０が溶接などにより一体的に接続されている。
ここで、弁本体３０は、たとえばステンレス等の金属から成り、内部に形成された空間である弁室１１を有している。また、弁本体３０の側面には、弁室１１に直接連通するたとえばステンレス製や銅製の第１管継手１２が固定装着されている。この第１管継手１２の弁室１１側には、流体の出入口となる断面円形の第１弁ポート１２ａが形成されている。さらに、弁本体３０の内部底面３０ａには、断面円形の第２弁ポート１６ａが上方に形成された弁座部１６が組み込まれている。なお、第２弁ポート１６ａは、弁体１７の直下において弁体１７と同軸方向に設けられている。弁座部１６には、第２弁ポート１６ａ、弁室１１を介して第１管継手１２に連通するたとえばステンレス製や銅製の第２管継手１５が固定装着されている。 In the motor-operated valve 2, the valve main body 30 is integrally connected to the lower side of the opening side of the case 60 having a cylindrical cup shape made of metal by welding or the like.
Here, the valve body 30 is made of a metal such as stainless steel and has a valve chamber 11 that is a space formed inside. Further, a first pipe joint 12 made of, for example, stainless steel or copper that communicates directly with the valve chamber 11 is fixedly attached to the side surface of the valve body 30. A first valve port 12a having a circular cross section serving as a fluid inlet / outlet is formed on the valve chamber 11 side of the first pipe joint 12. Further, the valve seat portion 16 in which the second valve port 16 a having a circular cross section is formed upward is incorporated in the inner bottom surface 30 a of the valve body 30. The second valve port 16 a is provided in the same direction as the valve body 17 immediately below the valve body 17. A second pipe joint 15 made of, for example, stainless steel or copper that communicates with the first pipe joint 12 through the second valve port 16a and the valve chamber 11 is fixedly attached to the valve seat portion 16.

ケース６０の内周には、回転可能なロータ４が収容され、ロータ４の軸芯部分には、ブッシュ部材３３を介して弁軸４１が配置されている。なお、ロータ４は、磁性粉を含有する樹脂材料やフェライト磁石等の磁性を有する素材で形成されている。ブッシュ部材３３と弁軸４１は、共にたとえばステンレス等の金属で形成されており、ブッシュ部材３３で結合された弁軸４１とロータ４とは、回転しながら上下方向に一体的に移動する。なお、この弁軸４１の中間部付近の外周面には雄ネジ４１ａが形成されている。本実施の形態では、弁軸４１が雄ネジ部材として機能している。また、弁体１７は第２弁ポート１６ａに対して近接又は離間可能となっている。   The rotatable rotor 4 is accommodated in the inner periphery of the case 60, and the valve shaft 41 is disposed on the shaft core portion of the rotor 4 via the bush member 33. The rotor 4 is formed of a magnetic material such as a resin material containing magnetic powder or a ferrite magnet. The bush member 33 and the valve shaft 41 are both made of metal such as stainless steel, and the valve shaft 41 and the rotor 4 coupled by the bush member 33 move integrally in the vertical direction while rotating. A male screw 41 a is formed on the outer peripheral surface near the middle portion of the valve shaft 41. In the present embodiment, the valve shaft 41 functions as a male screw member. Further, the valve body 17 can be moved close to or away from the second valve port 16a.

ケース６０の外周には、図示しないヨーク、ボビン、およびコイルなどからなるステータが配置され、ロータ４とステータとでステッピングモータが構成されている。
弁軸４１のブッシュ部材３３より下方には、後述するように弁軸４１との間でネジ送り機構Ａを構成するとともに弁軸４１の傾きを抑制する機能を有する弁軸ホルダ６が、弁本体３０に対して相対的に回転不能に固定されている。 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 4 and the stator constitute a stepping motor.
Below the bush member 33 of the valve shaft 41, a valve shaft holder 6 that functions as a screw feed mechanism A with the valve shaft 41 and suppresses the inclination of the valve shaft 41 is described below. It is fixed so that it cannot rotate relative to 30.

この弁軸ホルダ６は、上部側の筒状小径部６ａと下部側の筒状大径部６ｂと弁本体３０の内周部側に収容される嵌合部６ｃとリング状のフランジ部６ｆと嵌合部６ｃの下方（第２弁ポート１６ａ側）に延設された延設部６ｋから成る。そして、弁軸ホルダ６のフランジ部６ｆは、弁本体３０の上端に溶接などで固定されている。延設部６ｋの外周には上方（ロータ４側）に向かって大きくなるテーパーが形成されており、延設部６ｋの下端部は弁軸ホルダ６の中で最も外径が小さい。また、弁軸ホルダ６の内部には、後述する弁ガイド１８を収容する収容室６ｈが形成されている。なお、弁軸ホルダ６は、金属のフランジ部６ｆ以外が樹脂材料で形成されている。   The valve shaft holder 6 includes an upper cylindrical small diameter portion 6a, a lower cylindrical large diameter portion 6b, a fitting portion 6c accommodated on the inner peripheral side of the valve body 30, and a ring-shaped flange portion 6f. The extending portion 6k extends below the fitting portion 6c (on the second valve port 16a side). The flange portion 6f of the valve shaft holder 6 is fixed to the upper end of the valve body 30 by welding or the like. A taper that increases upward (on the rotor 4 side) is formed on the outer periphery of the extending portion 6k, and the lower end portion of the extending portion 6k has the smallest outer diameter in the valve shaft holder 6. A housing chamber 6h for housing a valve guide 18 (to be described later) is formed inside the valve shaft holder 6. The valve shaft holder 6 is made of a resin material except for the metal flange portion 6f.

また、この弁軸ホルダ６の筒状小径部６ａの上部開口部６ｇから所定の深さまで下方に向かって雌ネジ６ｄが形成されている。このため、本実施の形態では、弁軸ホルダ６が雌ネジ部材として機能している。そして、弁軸４１の外周に形成された雄ネジ４１ａと、弁軸ホルダ６の筒状小径部６ａの内周に形成された雌ネジ６ｄとにより、ネジ送り機構Ａが構成されている。   A female screw 6d is formed downward from the upper opening 6g of the cylindrical small diameter portion 6a of the valve shaft holder 6 to a predetermined depth. For this reason, in this embodiment, the valve shaft holder 6 functions as a female screw member. The screw feed mechanism A is configured by the male screw 41 a formed on the outer periphery of the valve shaft 41 and the female screw 6 d formed on the inner periphery of the cylindrical small diameter portion 6 a of the valve shaft holder 6.

さらに、弁軸ホルダ６の筒状大径部６ｂの側面には、均圧孔５１が穿設され、この均圧孔５１により、筒状大径部６ｂ内の収容室６ｈと、ロータ収容室６７（第２の背圧室）との間が連通している。このように均圧孔５１を設けることにより、ケース６０のロータ４を収容する空間と、弁軸ホルダ６内の空間とを連通することにより、弁体１７の移動動作をスムーズに行うことができる。   Further, a pressure equalizing hole 51 is formed in a side surface of the cylindrical large diameter portion 6b of the valve shaft holder 6, and the pressure equalizing hole 51 allows the accommodating chamber 6h in the cylindrical large diameter portion 6b and the rotor accommodating chamber. 67 (second back pressure chamber) communicates with each other. By providing the pressure equalizing hole 51 in this way, the space for accommodating the rotor 4 of the case 60 and the space in the valve shaft holder 6 communicate with each other, so that the movement of the valve body 17 can be performed smoothly. .

また、弁軸４１の下方には、筒状の弁体部２０が弁軸ホルダ６の収容室６ｈに対して摺動可能に配置されている。この弁体部２０は、収容室６ｈ内を摺動する筒状の弁ガイド１８、および第２弁ポート１６ａを通過する流体の流量を調整する弁体１７を備えている。なお、弁体１７は、弁ガイド１８の下方に固定され、弁ガイド１８によって保持されている。また、弁ガイド１８内には、圧縮された弁バネ２７とバネ受け３５とが収容されている。バネ受け３５の上端部は、弁軸４１の突出部４１ｃと点接触している。   Further, below the valve shaft 41, a cylindrical valve body portion 20 is disposed so as to be slidable with respect to the accommodation chamber 6 h of the valve shaft holder 6. The valve body 20 includes a cylindrical valve guide 18 that slides in the storage chamber 6h, and a valve body 17 that adjusts the flow rate of the fluid that passes through the second valve port 16a. The valve body 17 is fixed below the valve guide 18 and is held by the valve guide 18. A compressed valve spring 27 and a spring receiver 35 are accommodated in the valve guide 18. The upper end portion of the spring receiver 35 is in point contact with the protruding portion 41 c of the valve shaft 41.

弁ガイド１８は天井部２１側がプレス成形により略直角に折り曲げられている。そして、この天井部２１には貫通孔１８ａが形成されている。また、弁軸４１の下方には、さらに鍔部４１ｂが形成されている。   The valve guide 18 is bent at a substantially right angle on the ceiling 21 side by press molding. A through hole 18 a is formed in the ceiling portion 21. A flange 41 b is further formed below the valve shaft 41.

ここで、弁軸４１は、弁ガイド１８に対して回転可能、かつ径方向に変位可能となるように弁ガイド１８の貫通孔１８ａに遊貫状態で挿入されており、鍔部４１ｂは、弁ガイド１８に対して回転可能、かつ、径方向に変位可能となるように弁ガイド１８内に配置されている。また、弁軸４１は貫通孔１８ａを挿通し、鍔部４１ｂの上面が、弁ガイド１８の天井部２１に対向するように配置されている。なお、鍔部４１ｂが弁ガイド１８の貫通孔１８ａより大径であることにより、弁軸４１の抜け止めがなされている。   Here, the valve shaft 41 is inserted into the through hole 18a of the valve guide 18 so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction. It arrange | positions in the valve guide 18 so that it can rotate with respect to the guide 18 and it can displace to radial direction. In addition, the valve shaft 41 is inserted through the through hole 18 a and is arranged so that the upper surface of the flange portion 41 b faces the ceiling portion 21 of the valve guide 18. The flange 41b is larger in diameter than the through hole 18a of the valve guide 18 so that the valve shaft 41 is prevented from coming off.

弁軸４１と弁ガイド１８とが互いに径方向に移動可能であることにより、弁軸ホルダ６および弁軸４１の配置位置に関して、さほど高度な同芯取付精度を求められることなく、弁ガイド１８および弁体１７との同芯性が得られる。
弁ガイド１８の天井部２１と弁軸４１の鍔部４１ｂとの間には、中央部に貫通孔が形成されたワッシャ７０が設置されている。 Since the valve shaft 41 and the valve guide 18 are movable in the radial direction with respect to each other, the valve guide 18 and the valve guide 18 and the valve shaft 41 are not required to have a high degree of concentric mounting accuracy with respect to the arrangement positions of the valve shaft holder 6 and the valve shaft 41. Concentricity with the valve body 17 is obtained.
Between the ceiling portion 21 of the valve guide 18 and the flange portion 41b of the valve shaft 41, a washer 70 having a through-hole formed in the central portion is installed.

次に、実施の形態に係る電動弁２の要部について説明する。図２は、実施の形態に係る電動弁２の要部を拡大した図である。図２に示すように、弁体１７は、弁ガイド１８の内周に固定される円柱状の固定部１７ａ、弁ガイド１８の下端を閉塞する略円盤状の蓋部１７ｂ、および略円錐台状の形状を有し第２弁ポート１６ａを通過する流体の流量を調整する機能を有するニードル部１７ｃを備えている。なお、ニードル部１７ｃは弁体１７の最も下方に位置し、蓋部１７ｂの下方に突出している。   Next, the principal part of the motor-operated valve 2 according to the embodiment will be described. FIG. 2 is an enlarged view of a main part of the motor-operated valve 2 according to the embodiment. As shown in FIG. 2, the valve body 17 includes a columnar fixing portion 17 a that is fixed to the inner periphery of the valve guide 18, a substantially disc-shaped lid portion 17 b that closes the lower end of the valve guide 18, and a substantially truncated cone shape. And a needle portion 17c having a function of adjusting the flow rate of the fluid passing through the second valve port 16a. In addition, the needle part 17c is located in the lowest part of the valve body 17, and protrudes below the cover part 17b.

そして、図３に示すように、蓋部１７ｂは、ニードル部１７ｃの基端１７ｃ´の外周に位置する環状平面である環状平面部１７ｄを備えている。さらに、環状平面部１７ｄの外周には、外周径が上方（ロータ４側）に向かって大きくなるテーパーを形成する傾斜外周部１７ｅが形成されている。また、蓋部１７ｂの上端には、弁ガイド１８の下端と接触し、かつ弁体１７の最大外径をなす環状部１７ｇが形成されている。また、弁ガイド１８の外周と弁軸ホルダ６の収容室６ｈの内周の間には、クリアランス２２が形成されている。   And as shown in FIG. 3, the cover part 17b is provided with the cyclic | annular plane part 17d which is an annular plane located in the outer periphery of the base end 17c 'of the needle part 17c. Further, on the outer periphery of the annular flat portion 17d, an inclined outer peripheral portion 17e is formed which forms a taper whose outer diameter increases upward (on the rotor 4 side). Further, an annular portion 17g that is in contact with the lower end of the valve guide 18 and forms the maximum outer diameter of the valve body 17 is formed at the upper end of the lid portion 17b. A clearance 22 is formed between the outer periphery of the valve guide 18 and the inner periphery of the accommodating chamber 6 h of the valve shaft holder 6.

また、収容室６ｈの内周面下端６ｍ（第２弁ポート１６ａ側の下端）は、第２弁ポート１６ａの上端内径１６ａ´（ロータ４側の端部の内径）と弁ガイド１８の下端外周１８ｂとを通る仮想線Ｐの内側（弁中心軸Ｍ方向側）に位置している。ここで、図３は、弁体１７が最も弁座部１６に近接した状態を示しており、図４は、弁体１７が最も弁座部１６から離間した状態を示している。   The lower end 6m (the lower end on the second valve port 16a side) of the inner peripheral surface of the storage chamber 6h is the upper end inner diameter 16a '(the inner diameter of the end on the rotor 4 side) of the second valve port 16a and the lower end outer periphery of the valve guide 18. It is located inside the phantom line P passing through 18b (the valve center axis M direction side). Here, FIG. 3 shows a state in which the valve body 17 is closest to the valve seat portion 16, and FIG. 4 shows a state in which the valve body 17 is farthest from the valve seat portion 16.

また、図３、４に示すように、収容室６ｈの内周面下端６ｍは、弁体１７が弁体１７の可動可能ないずれの位置にあっても仮想線Ｐの内側に存在する。これにより、第２弁ポート１６ａから弁室１１内に向けて逆方向に流体を流した場合に、弁体部２０に当たった流体の流れ方向をクリアランス２２の下端開口部２２ａから逸らすことができる。よって、クリアランス２２の下端開口部２２ａに流体が流入することが抑制される。   As shown in FIGS. 3 and 4, the lower end 6 m of the inner peripheral surface of the storage chamber 6 h exists inside the imaginary line P regardless of the position where the valve body 17 can move the valve body 17. Thereby, when the fluid is flowed in the reverse direction from the second valve port 16a into the valve chamber 11, the flow direction of the fluid hitting the valve body 20 can be diverted from the lower end opening 22a of the clearance 22. . Therefore, the fluid is suppressed from flowing into the lower end opening 22 a of the clearance 22.

また、図５、６に示すように、本実施の形態に係る電動弁２は、弁軸ホルダ６の延設部６ｋの外周に形成されたテーパーを下方に延長した仮想円錐Ｑを仮定した場合、弁体部２０の一部が仮想円錐Ｑの外側にはみ出るように形成されている。図５に示すように、弁体１７が最も弁座部１６に近接した状態においては、弁ガイド１８、固定部１７ａ、蓋部１７ｂ、ニードル部１７ｃが仮想円錐Ｑの外側にはみ出る。また、図６に示すように、弁体１７が最も弁座部１６から離間した状態においては、弁ガイド１８の下端外周１８ｂ、傾斜外周部１７ｅ、および環状部１７ｇが仮想円錐Ｑの外側にはみ出る（円Ｗ内参照）。このように、常に弁体部２０の一部が仮想円錐Ｑの外側にはみ出ることにより、第２弁ポート１６ａから弁室１１内に上昇した流体のうち、弁体部２０に当たった流体が外側に逸れ、クリアランス２２の下端開口部２２ａに向かって直進しないようにすることができる。   As shown in FIGS. 5 and 6, the motor-operated valve 2 according to the present embodiment assumes a virtual cone Q in which a taper formed on the outer periphery of the extending portion 6 k of the valve shaft holder 6 extends downward. A part of the valve body 20 is formed so as to protrude outside the virtual cone Q. As shown in FIG. 5, when the valve body 17 is closest to the valve seat portion 16, the valve guide 18, the fixed portion 17 a, the lid portion 17 b, and the needle portion 17 c protrude outside the virtual cone Q. As shown in FIG. 6, when the valve element 17 is farthest from the valve seat portion 16, the lower end outer periphery 18b, the inclined outer periphery 17e, and the annular portion 17g of the valve guide 18 protrude outside the virtual cone Q. (Refer to circle W). As described above, when a part of the valve body portion 20 always protrudes outside the virtual cone Q, the fluid that has hit the valve body portion 20 out of the fluid rising from the second valve port 16a into the valve chamber 11 is outside. Therefore, it is possible to prevent the clearance 22 from going straight toward the lower end opening 22a.

また、図７に示すように、弁体１７の蓋部１７ｂに形成された傾斜外周部１７ｅのテーパー角度θ１は、延設部６ｋの外周のテーパー角度θ２よりも大きくなるように形成されている（θ１＞θ２）。さらに、テーパー角度θ１は、０°よりも大きく１８０°よりも小さくなる範囲内に設定されている（０°＜θ１＜１８０°）。ここで、テーパー角度θ１とは、図７に示す電動弁２の断面図において、両側の傾斜外周部１７ｅから延びる延長線Ｎが弁中心軸Ｍで交差する場合における、二つの延長線Ｎの間の角度である。また、テーパー角度θ２もまた同様に、両側の延設部６ｋの外周から延びる延長線Ｒが弁中心軸Ｍで交差する場合における、二つの延長線Ｒの間の角度である。   Further, as shown in FIG. 7, the taper angle θ1 of the inclined outer peripheral portion 17e formed on the lid portion 17b of the valve body 17 is formed to be larger than the taper angle θ2 of the outer periphery of the extending portion 6k. (Θ1> θ2). Further, the taper angle θ1 is set within a range larger than 0 ° and smaller than 180 ° (0 ° <θ1 <180 °). Here, the taper angle θ1 is the distance between two extension lines N when the extension line N extending from the inclined outer peripheral portion 17e on both sides intersects the valve center axis M in the sectional view of the motor-operated valve 2 shown in FIG. Is the angle. Similarly, the taper angle θ2 is also an angle between the two extension lines R when the extension line R extending from the outer periphery of the extending portions 6k on both sides intersects the valve center axis M.

このように、延設部６ｋや蓋部１７ｂにテーパーを設けることにより、上昇する流体を外側に流しクリアランス２２から逸れるように誘導することができる。また、傾斜外周部１７ｅのテーパー角度θ１を延設部６ｋのテーパー角度θ２よりも大きくすることにより、上昇中に傾斜外周部１７ｅに当たった流体の流れが、クリアランス２２の下端開口部２２ａから外側に離れる方向に変化し、更にその流れが、延設部６ｋの外周面よりも外側に誘導される。   In this way, by providing the extending portion 6k and the lid portion 17b with a taper, it is possible to guide the rising fluid to flow outward and away from the clearance 22. Further, by making the taper angle θ1 of the inclined outer peripheral portion 17e larger than the taper angle θ2 of the extending portion 6k, the flow of the fluid that hits the inclined outer peripheral portion 17e during the ascending is outward from the lower end opening 22a of the clearance 22. Further, the flow is guided to the outside of the outer peripheral surface of the extending portion 6k.

次に、電動弁２における流体の流れについて説明する。図２に示すように、第２管継手１５から弁座部１６の第２弁ポート１６ａを介して弁室１１内に流体が逆方向に流入した場合、流体は、テーパー角度を変えながら上方ほど外周径が大きくなるニードル部１７ｃの外周に沿って、弁体１７の外側に流れながら上昇する。上昇する流体は、外周径が上方に向かって大きくなる傾斜外周部１７ｅによって大きく弁体１７の外側に流れるように誘導され、クリアランス２２の下端開口部２２ａに流入することが防止される。   Next, the flow of fluid in the motor operated valve 2 will be described. As shown in FIG. 2, when the fluid flows into the valve chamber 11 from the second pipe joint 15 through the second valve port 16a of the valve seat 16 in the reverse direction, the fluid moves upward while changing the taper angle. Ascending while flowing to the outside of the valve body 17 along the outer periphery of the needle portion 17c having a larger outer diameter. The rising fluid is guided to flow largely outside the valve body 17 by the inclined outer peripheral portion 17e whose outer peripheral diameter increases upward, and is prevented from flowing into the lower end opening 22a of the clearance 22.

なお、図３、４に示すように、収容室６ｈの内周面下端６ｍは、仮想線Ｐの内側に位置しており、かつ延設部６ｋの下端部の外径は弁軸ホルダ６の中で最も外径が小さく形成されているため、上昇する流体は、的確にクリアランス２２の下端開口部２２ａに流入しないように誘導される。上昇する流体の一部は、第１弁ポート１２ａを介して第１管継手１２に排出され、他の一部は、さらに上昇を続ける。   As shown in FIGS. 3 and 4, the lower end 6 m of the inner peripheral surface of the storage chamber 6 h is located inside the imaginary line P, and the outer diameter of the lower end of the extending portion 6 k is the valve shaft holder 6. Since the outer diameter is the smallest among them, the rising fluid is accurately guided so as not to flow into the lower end opening 22 a of the clearance 22. A part of the rising fluid is discharged to the first pipe joint 12 through the first valve port 12a, and the other part continues to rise further.

さらに弁室１１内を上昇した流体は、弁軸ホルダ６の延設部６ｋの外周に形成されたテーパーにより、再度外側に向かって流れるように誘導される。このため、図９に示すように、弁軸ホルダ（雌ネジ部材１３１）の下端面１３１ａに衝突した流体の一部がクリアランス１３３の下端開口部１３３ａに流入することが防止される。流体は、弁軸ホルダ６の延設部６ｋの外周に形成されたテーパーに沿って上昇を続け、弁軸ホルダ６の嵌合部６ｃの下端面に衝突して折り返した後、第１管継手１２に排出される。   Further, the fluid that has risen in the valve chamber 11 is guided to flow outward again by a taper formed on the outer periphery of the extending portion 6 k of the valve shaft holder 6. For this reason, as shown in FIG. 9, part of the fluid colliding with the lower end surface 131 a of the valve shaft holder (female screw member 131) is prevented from flowing into the lower end opening 133 a of the clearance 133. The fluid continues to rise along the taper formed on the outer periphery of the extending portion 6k of the valve shaft holder 6, collides with the lower end surface of the fitting portion 6c of the valve shaft holder 6 and turns back, and then the first pipe joint 12 is discharged.

この実施の形態に係る電動弁２によれば、流体がクリアランス２２の下端開口部２２ａに流入することを防止することにより、クリアランス２２に流入した流体が弁体部２０を振動させることを抑制することができる。したがって、弁体部２０が振動して生じる騒音を緩和することができ、的確に静音性を維持することができる。   According to the electric valve 2 according to this embodiment, the fluid flowing into the clearance 22 is prevented from vibrating by preventing the fluid from flowing into the lower end opening 22 a of the clearance 22. be able to. Therefore, noise generated by the vibration of the valve body 20 can be reduced, and the quietness can be accurately maintained.

また、上昇する途中で環状平面部１７ｄに衝突した流体によって弁体１７が上方に付勢され、ネジ送り機構Ａにおける雄ネジ４１ａと雌ネジ６ｄとのネジ山の接触面を一定に保つことができネジガタが生じることを抑制することができる。また、流体が環状平面部１７ｄに当たることで、環状平面部１７ｄの外径方向に流れを変化させ、流体が前記クリアランス２２の下端開口部２２ａに流入して騒音が発生することが抑制される。したがって、的確に電動弁２の静音性を維持することができる。   Further, the valve body 17 is urged upward by the fluid that collides with the annular flat surface portion 17d while ascending, and the screw thread contact surface between the male screw 41a and the female screw 6d in the screw feed mechanism A can be kept constant. It is possible to suppress the occurrence of screw backlash. Further, when the fluid hits the annular flat surface portion 17d, the flow is changed in the outer diameter direction of the annular flat surface portion 17d, and the fluid is suppressed from flowing into the lower end opening 22a of the clearance 22 and generating noise. Therefore, the quietness of the motor-operated valve 2 can be accurately maintained.

また、弁体１７が弁ガイド１８に固定されているため、流体によって弁体１７が弁ガイド１８の中で振動することがなくなり、電動弁２の静音性を維持することができる。   Further, since the valve body 17 is fixed to the valve guide 18, the valve body 17 is not vibrated in the valve guide 18 by the fluid, and the quietness of the motor-operated valve 2 can be maintained.

また、上述の実施の形態においては、弁ガイド１８の下端外周１８ｂの外径が弁体部２０の最大外径となる場合を例に説明しているが、必ずしも下端外周１８ｂの外径が弁体部２０の最大外径にならない場合も想定される。この場合、弁体部２０の最大外径となる部分の下側端部と第２弁ポート１６ａの上端内径１６ａ´とを通る線を仮想線Ｐとしてもよい。ただし、この場合の弁体部２０とは、弁体部２０のうち、弁軸ホルダ６の収容室６ｈの内周面下端６ｍよりも下側に突出した部分である。   In the above-described embodiment, the case where the outer diameter of the lower end outer periphery 18b of the valve guide 18 is the maximum outer diameter of the valve body 20 is described as an example. It is also assumed that the maximum outer diameter of the body part 20 is not reached. In this case, a line passing through the lower end portion of the portion that has the maximum outer diameter of the valve body 20 and the upper end inner diameter 16a ′ of the second valve port 16a may be set as the virtual line P. However, the valve body portion 20 in this case is a portion of the valve body portion 20 that protrudes below the lower end 6m of the inner peripheral surface of the accommodating chamber 6h of the valve shaft holder 6.

また、上述の実施の形態において、環状平面部１７ｄおよび傾斜外周部１７ｅは、平らな面である場合を想定しているが凹凸があっても構わない。また、環状平面部１７ｄは、必ずしも弁中心軸Ｍと直交する平面でなくてもよく、弁中心軸Ｍと直交する平面に対して傾斜していてもよい。   In the above-described embodiment, the annular flat surface portion 17d and the inclined outer peripheral portion 17e are assumed to be flat surfaces, but may have irregularities. Further, the annular plane portion 17d is not necessarily a plane orthogonal to the valve center axis M, and may be inclined with respect to a plane orthogonal to the valve center axis M.

また、上述の実施の形態の電動弁２は、たとえば、圧縮機、凝縮器、膨張弁、および蒸発器等から成る冷凍サイクルシステムにおいて、凝縮器と蒸発器との間に設けられる膨張弁として用いられる。   Moreover, the motor-operated valve 2 of the above-described embodiment is used as an expansion valve provided between the condenser and the evaporator in a refrigeration cycle system including a compressor, a condenser, an expansion valve, an evaporator, and the like. It is done.

２ 電動弁
４ ロータ
６ 弁軸ホルダ
６ａ 筒状小径部
６ｂ 筒状大径部
６ｃ 嵌合部
６ｄ 雌ネジ
６ｆ フランジ部
６ｇ 上部開口部
６ｈ 収容室
６ｋ 延設部
６ｍ 内周面下端
１１ 弁室
１２ 第１管継手
１２ａ 第１弁ポート
１５ 第２管継手
１６ 弁座部
１６ａ 第２弁ポート
１６ａ´ 上端内径
１７ 弁体
１７ａ 固定部
１７ｂ 蓋部
１７ｃ ニードル部
１７ｃ´ 基端
１７ｄ 環状平面部
１７ｅ 傾斜外周部
１７ｇ 環状部
１８ 弁ガイド
１８ａ 貫通孔
１８ｂ 下端外周
２０ 弁体部
２１ 天井部
２２ クリアランス
２２ａ 下端開口部
２７ 弁バネ
３０ 弁本体
３０ａ 内部底面
３３ ブッシュ部材
４１ 弁軸
４１ａ 雄ネジ
４１ｂ 鍔部
４１ｃ 突出部
５１ 均圧孔
６０ ケース
６７ ロータ収容室
７０ ワッシャ
１００ 電動弁
１０３ ロータ
１１１ 第１管継手
１１２ 第２管継手
１１４ 弁体
１１８ 弁ガイド
１２０ 弁体部
１２１ 弁室
１２１ａ 雄ネジ
１３０ｂ 弁ポート
１３１ 雌ネジ部材
１３１ａ 雌ネジ
１３３ クリアランス
１３３ａ 下端開口部
Ｌ 弁中心軸
Ｍ 弁中心軸
Ｎ 延長線
Ｐ 仮想線
Ｑ 仮想円錐
Ｒ 延長線
θ１ 傾斜外周部１７ｅのテーパー角度
θ２ 延設部６ｋの外周のテーパー角度 2 Motorized valve 4 Rotor 6 Valve shaft holder 6a Tubular small diameter part 6b Tubular large diameter part 6c Fitting part 6d Female screw 6f Flange part 6g Upper opening part 6h Storage chamber 6k Extension part 6m Inner peripheral surface lower end 11 Valve chamber 12 1st pipe joint 12a 1st valve port 15 2nd pipe joint 16 Valve seat part 16a 2nd valve port 16a 'Upper end inner diameter 17 Valve body 17a Fixing part 17b Cover part 17c Needle part 17c' Base end 17d Annular plane part 17e Inclined outer periphery Part 17g Annular part 18 Valve guide 18a Through hole 18b Lower end outer periphery 20 Valve body part 21 Ceiling part 22 Clearance 22a Lower end opening part 27 Valve spring 30 Valve body 30a Inner bottom face 33 Bush member 41 Valve shaft 41a Male thread 41b Protruding part 41c Protruding part 51 Pressure equalizing hole 60 Case 67 Rotor housing chamber 70 Washer 100 Electric valve 103 Rotor 111 First pipe joint 112 Second pipe joint 114 Valve body 118 Valve Guide 120 Valve Body 121 Valve Chamber 121a Male Thread 130b Valve Port 131 Female Thread Member 131a Female Thread 133 Clearance 133a Bottom Opening L Valve Center Axis M Valve Center Axis N Extension Line P Virtual Line Q Virtual Conical R Extension Line θ1 Taper angle θ2 of the inclined outer peripheral portion 17e Taper angle of the outer periphery of the extending portion 6k

Claims (5)

ケースの内周に収容されたロータの回転運動を、雄ネジ部材と雌ネジ部材とのネジ送り機構により直線運動に変換し、この直線運動に基づいて弁本体内に収容された弁体を前記弁体の中心軸である弁中心軸方向に移動させる電動弁であって、
前記弁本体内に形成された空間である弁室と、
前記弁本体の側面に設けられ、前記弁室側の出入口となる第１弁ポートと、
前記弁体の直下において前記弁本体と同軸方向に設けられ、前記弁体が近接または離間可能な第２弁ポートと、
前記第２弁ポート側に前記弁体が固定されると共に前記弁中心軸方向に摺動可能に配置された弁ガイド、および前記弁体から成る弁体部と、
前記弁体部が前記弁中心軸方向に摺動する筒状の収容室が内部に形成された弁軸ホルダと
を備え、
前記収容室の内周面の前記第２弁ポート側端部である内周面下端が、
前記第２弁ポートの前記ロータ側の端部の内径と、
前記内周面下端よりも前記第２弁ポート側に突出した前記弁体部において、外径が最大となる部分の前記第２弁ポート側の端部と
を通る仮想線よりも前記弁中心軸方向側に位置することを特徴とする電動弁。 The rotational motion of the rotor accommodated in the inner periphery of the case is converted into a linear motion by a screw feed mechanism of a male screw member and a female screw member, and the valve body accommodated in the valve body based on the linear motion is An electric valve that moves in the direction of the valve center axis, which is the center axis of the valve body,
A valve chamber which is a space formed in the valve body;
A first valve port provided on a side surface of the valve main body and serving as an inlet / outlet on the valve chamber side;
A second valve port that is provided directly below the valve body in the same direction as the valve body, and in which the valve body can approach or separate;
A valve guide fixed to the second valve port side and slidably arranged in the valve central axis direction; and a valve body portion including the valve body;
A valve shaft holder in which a cylindrical storage chamber in which the valve body portion slides in the valve central axis direction is formed;
The lower end of the inner peripheral surface which is the second valve port side end portion of the inner peripheral surface of the storage chamber,
An inner diameter of the end of the second valve port on the rotor side;
In the valve body portion protruding to the second valve port side from the lower end of the inner peripheral surface, the valve central axis is more than the imaginary line passing through the end portion on the second valve port side of the portion having the maximum outer diameter. A motor-operated valve located on the direction side. 前記弁体が前記弁体の可動可能ないずれの位置にあっても、
前記収容室の内周面下端が前記仮想線よりも前記弁中心軸方向側に位置することを特徴とする請求項１記載の電動弁。 Even if the valve body is in any movable position of the valve body,
2. The motor-operated valve according to claim 1, wherein a lower end of an inner peripheral surface of the storage chamber is positioned on the valve center axis direction side with respect to the virtual line. 前記弁体は、外周径が前記ロータ側に向かって大きくなるテーパーを形成する傾斜外周部を備え、
前記弁軸ホルダは、前記第２弁ポート側に延設され、外周径が前記ロータ側に向かって大きくなるテーパーを形成する延設部を備え、
前記延設部の前記第２弁ポート側の下端部は、前記弁軸ホルダの中で最も外径が小さく形成され、
前記傾斜外周部のテーパー角度は、前記延設部のテーパー角度よりも大きく、かつ、０°よりも大きく１８０°よりも小さいことを特徴とする請求項１または２に記載の電動弁。 The valve body includes an inclined outer peripheral portion that forms a taper whose outer peripheral diameter increases toward the rotor side,
The valve shaft holder includes an extending portion that extends toward the second valve port and forms a taper whose outer diameter increases toward the rotor.
The lower end portion of the extending portion on the second valve port side is formed with the smallest outer diameter among the valve shaft holders,
3. The motor-operated valve according to claim 1, wherein a taper angle of the inclined outer peripheral portion is larger than a taper angle of the extending portion and larger than 0 ° and smaller than 180 °. 前記弁体は、
前記第２弁ポートと近接する部分であるニードル部と、
前記ニードル部の基端の外周に位置する環状の環状平面部と
を備えることを特徴とする請求項１〜３の何れか一項に記載の電動弁。 The valve body is
A needle portion that is a portion adjacent to the second valve port;
The motor-operated valve according to any one of claims 1 to 3, further comprising an annular annular flat surface portion positioned on an outer periphery of a proximal end of the needle portion. 圧縮機、凝縮器、膨張弁、および蒸発器を含む冷凍サイクルシステムであって、請求項１〜４の何れか一項に記載の電動弁を前記膨張弁として用いることを特徴とする冷凍サイクルシステム。   A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the motor-operated valve according to any one of claims 1 to 4 is used as the expansion valve. .
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