JP6621795B2 - Motorized valve - Google Patents

Motorized valve Download PDF

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JP6621795B2
JP6621795B2 JP2017229923A JP2017229923A JP6621795B2 JP 6621795 B2 JP6621795 B2 JP 6621795B2 JP 2017229923 A JP2017229923 A JP 2017229923A JP 2017229923 A JP2017229923 A JP 2017229923A JP 6621795 B2 JP6621795 B2 JP 6621795B2
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valve
valve shaft
guide stem
oil reservoir
shaft
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JP2019100394A (en
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菅沼 威
威 菅沼
谷田貝 洋臣
洋臣 谷田貝
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Fujikoki Corp
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Fujikoki Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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Description

本発明は、空気調和機、冷凍機等の冷凍サイクルに流量制御弁等として組み込まれて使用される電動弁に係り、特に、雄ねじ部と雌ねじ部とからなるねじ送り機構によってモータの回転運動を直線運動に変換して弁体を昇降させるタイプの電動弁に関する。   The present invention relates to an electric valve that is used as a flow control valve or the like in a refrigeration cycle such as an air conditioner or a refrigerator, and in particular, rotates a motor by a screw feed mechanism including a male screw part and a female screw part. The present invention relates to a motor-driven valve of a type that moves up and down by converting into linear motion.

例えば、モータ駆動型の電動弁は、モータの回転運動を雄ねじ部と雌ねじ部とから構成されるねじ送り機構によって直線運動に変換することにより、弁体を弁座に対して昇降させて弁の開閉(つまり、弁口を通過する流体(冷媒)の流量制御)を行っている。   For example, a motor-driven electric valve converts a rotary motion of a motor into a linear motion by a screw feed mechanism composed of a male screw portion and a female screw portion, thereby raising and lowering the valve body with respect to a valve seat. Opening and closing (that is, flow control of the fluid (refrigerant) passing through the valve port) is performed.

この種の電動弁としては、弁体が設けられるとともに、雄ねじ部が形成された弁軸、前記弁軸の雄ねじ部が螺合する雌ねじ部が形成されたガイドステム、前記弁体が接離する弁座付きの弁口を有するとともに前記ガイドステムが設けられた弁本体、前記弁本体に固定されたキャン、前記弁軸を前記ガイドステムに対して回転させながら昇降させるためのロータ及びステータを有するモータ等を備え、前記ガイドステムに形成された雌ねじ部と前記弁軸に形成された雄ねじ部とで、前記弁体を前記弁座に対して昇降させるためのねじ送り機構が構成されているものが知られている(例えば、下記特許文献1等参照)。   As this type of electric valve, a valve body is provided, a valve shaft in which a male screw portion is formed, a guide stem in which a female screw portion into which the male screw portion of the valve shaft is screwed, and the valve body are brought into and out of contact with each other. A motor having a valve body with a valve seat and provided with the guide stem, a can fixed to the valve body, a rotor for moving the valve shaft up and down relative to the guide stem, and a stator And a screw feed mechanism for raising and lowering the valve body with respect to the valve seat is constituted by a female screw part formed on the guide stem and a male screw part formed on the valve shaft. It is known (see, for example, Patent Document 1 below).

特開2016−089870号公報JP 2006-089870 A

ところで、前記した如くの従来の電動弁では、弁の開閉に際して、ねじ送り機構を構成するガイドステムの雌ねじ部(固定ねじ部)(のねじ面)と弁軸の雄ねじ部(可動ねじ部)(のねじ面)とが摺接せしめられるので、経年劣化や異物噛み込み等によって、雌ねじ部と雄ねじ部との間(ねじ面間)の摺動抵抗が増加して、弁軸が動きにくくなる動作不良が発生するおそれがある。また、前記した摺動抵抗の増加に対処すべく、モータの駆動トルクを大きくすると、大型化、重量増加等を招く懸念がある。   By the way, in the conventional electric valve as described above, when the valve is opened and closed, the internal thread portion (fixed thread portion) of the guide stem constituting the screw feed mechanism (the thread surface thereof) and the external thread portion of the valve shaft (movable thread portion) ( Since the sliding resistance between the female screw part and the male screw part (between the screw faces) increases due to deterioration over time or foreign object biting, etc., the valve shaft becomes difficult to move. Defects may occur. Further, if the motor driving torque is increased in order to cope with the increase in the sliding resistance, there is a concern of increasing the size, increasing the weight, and the like.

本発明は、前記課題に鑑みてなされたものであって、その目的とするところは、大型化、重量増加等を招くことなく、動作性を安定させることのできる電動弁を提供することにある。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a motor-operated valve that can stabilize operability without causing an increase in size, an increase in weight, or the like. .

上記する課題を解決するために、本発明に係る電動弁は、基本的に、弁体が設けられるとともに、雄ねじ部が形成された弁軸と、前記弁軸の雄ねじ部が螺合する雌ねじ部が形成されたガイドステムと、前記弁体が接離する弁座付きの弁口を有するとともに前記ガイドステムが設けられた弁本体と、前記弁本体に固定されたキャンと、前記弁軸を前記ガイドステムに対して回転させるための、前記弁軸に連結されたロータ及びステータを有するモータと、を備え、前記ガイドステムの前記雌ねじ部と前記弁軸の前記雄ねじ部とで、前記弁体を前記弁座に対して昇降させるためのねじ送り機構が構成され、前記弁軸における前記雄ねじ部隣接して、かつ前記弁軸の最下降位置において前記雌ねじ部の上端部に対応する位置から前記弁軸の最上昇位置において前記雌ねじ部の上端部に対応する位置に亘って、前記ガイドステムと前記弁軸との間にオイルを溜めるための隙間を形成する内側オイル溜り溝が設けられ、前記ガイドステムにおける前記雌ねじ部の上側に隣接して、前記ガイドステムと前記弁軸との間にオイルを溜めるための隙間を形成する外側オイル溜り溝が設けられ、前記外側オイル溜り溝の底面は、軸線に対して垂直な平坦面もしくは中心軸線に向けて低くなる傾斜面を有し、前記ガイドステムにおける前記雌ねじ部は、前記ロータの内側空間に配置され、前記弁軸は、前記雌ねじ部を貫通し、上部に前記ロータが固定され、開弁時に、前記弁軸は、前記外側オイル溜り溝と前記ロータの間に、前記ロータの内側空間に露出する部分を有し、前記内側オイル溜り溝と前記外側オイル溜り溝は連続していることを特徴としている。 In order to solve the above-described problems, the motor-operated valve according to the present invention basically includes a valve body provided with a valve body in which a male thread part is formed and a female thread part in which the male thread part of the valve shaft is screwed. A valve stem with a valve seat with which the valve body contacts and separates, a valve body provided with the guide stem, a can fixed to the valve body, and the valve shaft. A motor having a rotor and a stator connected to the valve shaft for rotating with respect to the stem, and the valve body is formed by the female screw portion of the guide stem and the male screw portion of the valve shaft. A screw feed mechanism for raising and lowering the valve seat is configured, and the valve is located from a position adjacent to the male screw portion of the valve shaft and corresponding to the upper end portion of the female screw portion at the lowest lowered position of the valve shaft. The highest rise of the shaft Over a position corresponding to the upper end portion of the female screw portion in location, said guide stem and the inner oil reservoir groove is provided to form a gap for storing the oil between the valve shaft, the internal thread in the guide stem An outer oil reservoir groove that forms a gap for storing oil is provided between the guide stem and the valve shaft adjacent to the upper side of the portion, and the bottom surface of the outer oil reservoir groove is perpendicular to the axis. A flat surface or an inclined surface that decreases toward the central axis, the female threaded portion of the guide stem is disposed in an inner space of the rotor, and the valve shaft passes through the female threaded portion, and the upper portion is The rotor is fixed, and when the valve is opened, the valve shaft has a portion exposed to the inner space of the rotor between the outer oil pool groove and the rotor, and the inner oil pool groove and the rotor Side oil reservoir groove is characterized by being continuous.

更に好ましい態様では、前記ガイドステムにおける前記外側オイル溜り溝の外側に、前記弁軸の最下降位置を規定する閉弁方向用固定ストッパが設けられる。 In a further preferred aspect, a valve-closing direction fixed stopper for defining a lowest lowered position of the valve shaft is provided outside the outer oil pool groove in the guide stem.

他の好ましい態様では、前記内側オイル溜り溝又は前記外側オイル溜り溝は、軸線周りの全周もしくは一部に設けられる。 In another preferred embodiment, the inner oil reservoir groove or the outer oil reservoir groove is provided on the entire circumference or a part of the circumference of the axis.

別の好ましい態様では、前記弁軸は、前記ねじ送り機構の下側部分が前記ガイドステムに摺動自在に内挿される。   In another preferred embodiment, the valve shaft is slidably inserted into the guide stem at the lower portion of the screw feed mechanism.

更に好ましい態様では、前記弁軸は、前記ねじ送り機構の下側部分が前記雌ねじ部より大径の軸受穴に摺動自在に内挿される。   In a further preferred aspect, the valve shaft is slidably inserted in a bearing hole having a lower portion of the screw feed mechanism larger in diameter than the female screw portion.

本発明によれば、ねじ送り機構を構成する弁軸における雄ねじ部又はガイドステムにおける雌ねじ部の少なくとも一方に隣接してオイル溜り溝が設けられるので、キャン内に充満(例えば、噴霧状に充満)して弁軸やガイドステムに付着する冷媒に含まれるオイル(冷凍サイクル内の冷凍機油)が当該オイル溜り溝に溜められる。当該オイル溜り溝に溜まったオイルは、雌ねじ部と雄ねじ部との相対回転や重力等によって当該オイル溜り溝から雌ねじ部と雄ねじ部との間(ねじ面間)に侵入し、雌ねじ部と雄ねじ部とが摺接する際の潤滑剤(油)となって、雌ねじ部と雄ねじ部との間(ねじ面間)の摺動抵抗の増加が抑えられるため、動作性を安定させることができる。   According to the present invention, the oil reservoir groove is provided adjacent to at least one of the male screw portion in the valve shaft constituting the screw feed mechanism or the female screw portion in the guide stem, so that the can is filled (for example, filled in a spray form). Thus, oil (refrigeration machine oil in the refrigeration cycle) contained in the refrigerant adhering to the valve shaft and the guide stem is accumulated in the oil reservoir groove. The oil accumulated in the oil reservoir groove enters between the female thread portion and the male screw portion (between the screw surfaces) from the oil reservoir groove due to relative rotation between the female screw portion and the male screw portion, gravity, or the like, and the female screw portion and the male screw portion. It becomes a lubricant (oil) at the time of sliding contact, and an increase in sliding resistance between the female screw portion and the male screw portion (between the screw surfaces) is suppressed, so that the operability can be stabilized.

また、雌ねじ部と雄ねじ部との間(ねじ面間)に異物を噛み込んだ場合でも、例えば雌ねじ部と雄ねじ部とが摺接する際に、前記異物が雌ねじ部と雄ねじ部との間(ねじ面間)に侵入したオイルとともに排出され、異物噛み込みによる雌ねじ部と雄ねじ部との間(ねじ面間)の摺動抵抗の増加が抑えられるため、これによっても、動作性を安定させることができる。   Further, even when a foreign object is caught between the female screw part and the male screw part (between the screw surfaces), for example, when the female screw part and the male screw part are in sliding contact, the foreign object is between the female screw part and the male screw part (screw It is discharged together with the oil that has entered the space), and the increase in sliding resistance between the female thread and the male thread (between the threaded surfaces) due to the biting of foreign matter can be suppressed. This also stabilizes the operability. it can.

本発明に係る電動弁の第1実施形態の全閉状態を示す縦断面図。The longitudinal cross-sectional view which shows the fully closed state of 1st Embodiment of the motor operated valve which concerns on this invention. 本発明に係る電動弁の第1実施形態の全開状態を示す縦断面図。The longitudinal cross-sectional view which shows the fully open state of 1st Embodiment of the motor operated valve which concerns on this invention. 第1実施形態の電動弁の他例(その1)の全閉状態を示す縦断面図。The longitudinal cross-sectional view which shows the fully closed state of the other example (the 1) of the electrically operated valve of 1st Embodiment. 第1実施形態の電動弁の他例(その1)の全開状態を示す縦断面図。The longitudinal cross-sectional view which shows the fully open state of the other example (the 1) of the electrically operated valve of 1st Embodiment. 第1実施形態の電動弁の他例(その2)の全閉状態を示す縦断面図。The longitudinal cross-sectional view which shows the fully closed state of the other example (the 2) of the motor operated valve of 1st Embodiment. 第1実施形態の電動弁の他例(その2)の全開状態を示す縦断面図。The longitudinal cross-sectional view which shows the fully open state of the other example (the 2) of the motor operated valve of 1st Embodiment. 本発明に係る電動弁の第2実施形態の全閉状態を示す縦断面図。The longitudinal cross-sectional view which shows the fully closed state of 2nd Embodiment of the motor operated valve which concerns on this invention. 本発明に係る電動弁の第2実施形態の全開状態を示す縦断面図。The longitudinal cross-sectional view which shows the fully open state of 2nd Embodiment of the motor operated valve which concerns on this invention. 図7のU−U矢視線に従う断面図。FIG. 8 is a cross-sectional view taken along the line U-U in FIG. 7. (A)は第2実施形態の電動弁の他例(その1)の要部拡大縦断面図、(B)は図10(A)のU−U矢視線に従う断面図。(A) is a principal part expanded longitudinal sectional view of the other example (the 1) of the electrically operated valve of 2nd Embodiment, (B) is sectional drawing which follows the U arrow line of FIG. 10 (A). (A)は第2実施形態の電動弁の他例(その2)の要部拡大縦断面図、(B)は図11(A)のU−U矢視線に従う断面図。(A) is a principal part expanded longitudinal sectional view of the other example (the 2) of the electrically operated valve of 2nd Embodiment, (B) is sectional drawing which follows the U arrow line of FIG. 11 (A).

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

[第1実施形態]
図1及び図2は、本発明に係る電動弁の第1実施形態を示す縦断面図であり、図1は全閉状態、図2は全開状態を示す図である。
[First Embodiment]
1 and 2 are longitudinal sectional views showing a first embodiment of a motor-operated valve according to the present invention. FIG. 1 is a fully closed state, and FIG. 2 is a fully open state.

なお、本明細書において、上下、左右、前後等の位置、方向を表わす記述は、説明が煩瑣になるのを避けるために図面に従って便宜上付けたものであり、実際の使用状態での位置、方向を指すとは限らない。   In this specification, descriptions representing positions and directions such as up and down, left and right, and front and rear are given for the sake of convenience in accordance with the drawings in order to avoid complicated explanation, and the positions and directions in the actual use state. Does not necessarily mean

また、各図において、部材間に形成される隙間や部材間の離隔距離等は、発明の理解を容易にするため、また、作図上の便宜を図るため、各構成部材の寸法に比べて大きくあるいは小さく描かれている場合がある。   In each drawing, the gap formed between the members, the separation distance between the members, etc. are larger than the dimensions of each constituent member for easy understanding of the invention and for convenience of drawing. Or it may be drawn small.

図示実施形態の電動弁1は、上面が開口した有底円筒状の弁本体10、該弁本体10の上端面部外周側にその下端部が溶接等により密封接合されたキャン45、弁本体10の上端面部内周側に溶接等により固定された鍔状円板18付きのガイドステム15、該ガイドステム15の小径上部15b内周(の上半部)に形成された雌ねじ部15iに、その中間軸状部21a外周に形成された雄ねじ部21e(の下部雄ねじ部21g)が螺合せしめられた弁軸21、該弁軸21に一体回動可能に連結固定されたロータ30、及び該ロータ30を回転駆動すべく前記キャン45の外周に外嵌されたステータ50を備えている。   The motor-operated valve 1 of the illustrated embodiment includes a bottomed cylindrical valve body 10 having an open upper surface, a can 45 having a lower end portion hermetically sealed to the outer peripheral side of the upper end surface portion of the valve body 10 by welding or the like, A guide stem 15 with a bowl-shaped disk 18 fixed to the inner peripheral side of the upper end surface portion by welding or the like, and a female screw portion 15i formed on the inner periphery (upper half portion) of the small-diameter upper portion 15b of the guide stem 15 A valve shaft 21 in which a male screw portion 21e (a lower male screw portion 21g) formed on the outer periphery of the shaft-shaped portion 21a is screwed, a rotor 30 connected and fixed to the valve shaft 21 so as to be integrally rotatable, and the rotor 30 The stator 50 is fitted on the outer periphery of the can 45 so as to be rotationally driven.

ここでは、ロータ30とステータ50とでステッピングモータが構成され、また、ガイドステム15の雌ねじ部(固定ねじ部)15iと弁軸21の雄ねじ部(可動ねじ部)21eとでねじ送り機構が構成され、前記ステッピングモータとねじ送り機構とで弁軸21(並びに、後述する弁ホルダ23)を回転させながら昇降させるための昇降駆動装置が構成されている。   Here, a stepping motor is constituted by the rotor 30 and the stator 50, and a screw feed mechanism is constituted by the female screw portion (fixed screw portion) 15i of the guide stem 15 and the male screw portion (movable screw portion) 21e of the valve shaft 21. The stepping motor and the screw feed mechanism constitute an elevating drive device for elevating and lowering the valve shaft 21 (and a later-described valve holder 23).

前記弁本体10は、例えば金属板材を素材としてプレス加工により作製されたもので、その底部10bには、弁座11a付きの弁口11bを有する弁座部材11がろう付け等で固定され、その上部にはガイドステム15の下部が挿入されている。   The valve body 10 is manufactured by pressing a metal plate material, for example, and a valve seat member 11 having a valve port 11b with a valve seat 11a is fixed to the bottom portion 10b by brazing or the like. The lower part of the guide stem 15 is inserted into the upper part.

前記弁本体10内に画成される弁室12の一側方(つまり、弁本体10の側壁部10a)には、管継手からなる第1入出口6がろう付け等により接合され、弁座部材11(の下部)には、管継手からなる第2入出口7がろう付け等により接合されている。   A first inlet / outlet 6 made of a pipe joint is joined to one side of the valve chamber 12 defined in the valve body 10 (that is, the side wall portion 10a of the valve body 10) by brazing or the like. A second inlet / outlet 7 made of a pipe joint is joined to the member 11 (lower part) by brazing or the like.

前記弁軸21は、前記ロータ30の連結体32が外嵌せしめられる上部小径部21b、雄ねじ部21eを有する中間軸状部21a、及び、該中間軸状部21a(雄ねじ部21e)より下側のかしめ部21d付きの下部大径部21cを有する。   The valve shaft 21 includes an upper small diameter portion 21b into which the coupling body 32 of the rotor 30 is fitted, an intermediate shaft portion 21a having a male screw portion 21e, and a lower side than the intermediate shaft portion 21a (male screw portion 21e). It has a lower large diameter portion 21c with a caulking portion 21d.

詳しくは、前記中間軸状部21aは、その上部外周に上部雄ねじ部21fが形成され、その下半部外周に下部雄ねじ部21gが形成されており、上部雄ねじ部21fは、後述する閉弁方向用可動ストッパ35(のナット部35a)に螺合せしめられ、下部雄ねじ部21gが、ガイドステム15の小径上部15bの内周上半部に形成された雌ねじ部15iに螺合せしめられている。また、前記中間軸状部21aにおいて上部雄ねじ部21fと下部雄ねじ部21gとの間は、ガイドステム15と弁軸21との間にオイルを溜めるための隙間を形成する、環状かつ凹状のオイル溜り溝21hとされる。   Specifically, the intermediate shaft-shaped portion 21a has an upper male screw portion 21f formed on the upper outer periphery thereof, and a lower male screw portion 21g formed on the lower half outer periphery thereof. The upper male screw portion 21f has a valve closing direction described later. The lower male screw portion 21g is screwed to a female screw portion 15i formed in the upper half of the inner periphery of the small diameter upper portion 15b of the guide stem 15. Further, in the intermediate shaft portion 21a, an annular and concave oil reservoir that forms a gap for storing oil between the guide stem 15 and the valve shaft 21 between the upper male screw portion 21f and the lower male screw portion 21g. A groove 21h is formed.

本例では、前記オイル溜り溝21hは、中間軸状部21aの上下方向(軸線O方向)長さの1/4程度に設定されており、その上端は、弁軸21(弁体25)等が最下降位置(図1に示される全閉状態)にあるときに、ガイドステム15(の雌ねじ部15i)の上端部に対応する位置とされており、その下端は、弁軸21(弁体25)等が最上昇位置(図2に示される全開状態)にあるときに、ガイドステム15(の雌ねじ部15i)の上端部に対応する位置とされている。   In this example, the oil reservoir groove 21h is set to about 1/4 of the length in the vertical direction (axis O direction) of the intermediate shaft portion 21a, and the upper end thereof is the valve shaft 21 (valve element 25) or the like. Is at a position corresponding to the upper end portion of the guide stem 15 (the female thread portion 15i thereof) when it is in the lowest lowered position (fully closed state shown in FIG. 1). 25) and the like are in the most elevated position (fully opened state shown in FIG. 2), the position corresponds to the upper end of the guide stem 15 (the female thread portion 15i).

また、本例では、中間軸状部21aに雄ねじを形成した後にオイル溜り溝21hを形成したため、オイル溜り溝21hの上部の雄ねじ(上部雄ねじ部21f)とオイル溜り溝21hの下部の雄ねじ(下部雄ねじ部21g)が同一のねじ位相で構成されている。よって、ねじを形成する工数を削減することができる。勿論、中間軸状部21aにオイル溜り溝21hを形成した後に雄ねじを形成してもよい。なお、上部雄ねじ部21fと下部雄ねじ部21gとは異なるねじ位相にしてもよいことは勿論である。   Further, in this example, since the oil reservoir groove 21h is formed after the male screw is formed in the intermediate shaft-shaped portion 21a, the male screw (upper male screw portion 21f) above the oil reservoir groove 21h and the male screw (lower portion) of the oil reservoir groove 21h. The male screw portion 21g) is composed of the same screw phase. Therefore, the man-hour for forming the screw can be reduced. Of course, the male thread may be formed after the oil retaining groove 21h is formed in the intermediate shaft portion 21a. Of course, the upper male screw portion 21f and the lower male screw portion 21g may have different screw phases.

中間軸状部21aの下側(つまり、ねじ送り機構の下側)に設けられた下部大径部21cは、中間軸状部21aの上下方向(軸線O方向)長さより若干短く設定されている。この下部大径部21cの上部は、ガイドステム15の小径上部15bの内周下半部(つまり、雌ねじ部15iの下側)に形成された比較的大径(詳しくは、その直上に設けられた雌ねじ部15iより大径)の軸受穴15cに(昇降方向および回転方向に)摺動自在に内挿されており、これにより、前記弁軸21が前記ガイドステム15にガイドされながら昇降するようになっている。   The lower large-diameter portion 21c provided on the lower side of the intermediate shaft portion 21a (that is, the lower side of the screw feed mechanism) is set slightly shorter than the length in the vertical direction (axis O direction) of the intermediate shaft portion 21a. . The upper portion of the lower large-diameter portion 21c is provided with a relatively large diameter (specifically, directly above it) formed in the lower half of the inner periphery of the small-diameter upper portion 15b of the guide stem 15 (that is, below the female screw portion 15i). Further, the valve shaft 21 is slidably inserted into the bearing hole 15c (larger than the female thread portion 15i) (in the up-and-down direction and the rotation direction) so that the valve shaft 21 is raised and lowered while being guided by the guide stem 15. It has become.

弁軸21の下端部には、その下部大径部21cの下端面に設けられたかしめ部21dにその天井穴部分が連結固定され、ガイドステム15の大径円筒状胴部15aに摺動自在に嵌挿された天井部23b付き円筒状の弁ホルダ23が保持されている。この弁ホルダ23の円筒部23a下部には、弁体25の上部が上下方向(昇降方向)に摺動自在に挿入(内挿)されて保持されている。   At the lower end of the valve shaft 21, the ceiling hole portion is connected and fixed to a caulking portion 21d provided on the lower end surface of the lower large diameter portion 21c, and is slidable on the large diameter cylindrical barrel portion 15a of the guide stem 15. A cylindrical valve holder 23 with a ceiling portion 23b fitted in is held. The upper part of the valve body 25 is slidably inserted (inserted) in the vertical direction (up and down direction) and held at the lower part of the cylindrical portion 23a of the valve holder 23.

弁体25は、本例では、例えば金属を素材として上下方向(軸線O方向)に沿って配置された段付き軸状の中実部材から作製されており、逆円錐台面部を有する弁座11a(弁口11b)内にその下部が挿入されて着座する逆円錐台状の弁体部25a、該弁体部25aの上部に連なる短円柱部25b、該短円柱部25bの上部に連なる円柱状の小径胴部25c、及び、この小径胴部25cの上部に圧入・溶接等により外嵌固定された厚肉かつ外周が窪んだ形状の抜止スリーブ25dを有するとともに、前記短円柱部25bの所定部位には鍔状部29が(外向きに)設けられている。前記小径胴部25cは、前記弁ホルダ23(の円筒部23a)の下端部に固定された底板部27の通し穴27aに(若干の隙間をあけて)挿通されるとともに、前記底板部27の通し穴27aに挿通される前記小径胴部25cの外径は、前記弁座11a(弁口11b)の口径よりも小さくされている。   In this example, the valve body 25 is made of a stepped shaft-shaped solid member disposed along the vertical direction (axis O direction) using, for example, metal as a raw material, and has a valve seat 11a having an inverted truncated cone surface portion. An inverted frustoconical valve body portion 25a seated with its lower portion inserted into (valve port 11b), a short cylindrical portion 25b continuous with the upper portion of the valve body portion 25a, and a cylindrical shape continuous with the upper portion of the short cylindrical portion 25b A small-diameter body portion 25c, and a thick-walled retaining sleeve 25d that is externally fitted and fixed to the upper portion of the small-diameter body portion 25c by press-fitting, welding, or the like, and a predetermined portion of the short cylindrical portion 25b. Is provided with a hook-like portion 29 (outwardly). The small diameter body portion 25c is inserted into the through hole 27a of the bottom plate portion 27 fixed to the lower end portion of the valve holder 23 (the cylindrical portion 23a thereof) (with a slight gap), and the bottom plate portion 27 The outer diameter of the small diameter body portion 25c inserted through the through hole 27a is smaller than the diameter of the valve seat 11a (valve port 11b).

弁ホルダ23(の円筒部23a)の下端部には、前記弁体25(の抜止スリーブ25d)を、間に薄肉の環状円板からなるワッシャ28を挟んで抜け止め係止するとともに、前記通し穴27aが設けられた厚肉板からなる底板部27がかしめ・溶接等により保持固定されている。   At the lower end portion of the valve holder 23 (the cylindrical portion 23a thereof), the valve body 25 (the retaining sleeve 25d) is retained and retained with a washer 28 made of a thin annular disk interposed therebetween, and A bottom plate portion 27 made of a thick plate provided with a hole 27a is held and fixed by caulking, welding or the like.

一方、弁体25(の小径胴部25c)の上面には、断面外形がハット形のばね受け部材26が載せられ、このばね受け部材26の鍔状部26aと弁ホルダ23の天井部23bとの間には弁体押圧兼緩衝用の円筒状の圧縮コイルばねからなる弁体付勢ばね24が縮装されており、弁体25は弁体付勢ばね24(の付勢力)により常時下向き(閉弁方向)に付勢されている。   On the other hand, a spring receiving member 26 having a hat-shaped cross section is placed on the upper surface of the valve body 25 (the small-diameter body portion 25c). The flange-like portion 26a of the spring receiving member 26 and the ceiling portion 23b of the valve holder 23 A valve body biasing spring 24 comprising a cylindrical compression coil spring for pressing and buffering the valve body is compressed between the valve body 25 and the valve body 25 is always directed downward by the valve body biasing spring 24 (biasing force thereof). It is biased in the (valve closing direction).

上記した弁軸21、弁ホルダ23、弁体25、及び弁体付勢ばね24は、弁体25が弁座11aから離隔している状態(開弁状態)においては実質的に一体的に回転しながら昇降せしめられる。   The valve shaft 21, the valve holder 23, the valve body 25, and the valve body biasing spring 24 described above rotate substantially integrally when the valve body 25 is separated from the valve seat 11a (opened state). It can be lifted up and down.

なお、前記弁体25に設けられた鍔状部29及び弁ホルダ23に設けられた該弁ホルダ23の底部を構成する底板部27は、それぞれ組立時の便宜を図るため(組立用基準位置を検出するため)の組立用ストッパ機構の固定ストッパ及び可動ストッパとなっている。   Note that a flange 29 provided in the valve body 25 and a bottom plate portion 27 constituting the bottom of the valve holder 23 provided in the valve holder 23 are respectively provided for the convenience of assembly (set the reference position for assembly). It serves as a fixed stopper and a movable stopper for the assembly stopper mechanism.

この場合、図2に示される如くの開弁状態においては、弁体25の抜止スリーブ25dは、間にワッシャ28を挟んで底板部27に対接係止されており、底板部27の下面と鍔状部29の上面、言い換えれば、組立用ストッパ機構の可動ストッパ(底板部)27と固定ストッパ(鍔状部)29とは、所定の距離だけ離隔している。   In this case, in the valve open state as shown in FIG. 2, the retaining sleeve 25 d of the valve body 25 is contacted and locked to the bottom plate portion 27 with the washer 28 therebetween, and the bottom surface of the bottom plate portion 27 The upper surface of the bowl-shaped part 29, in other words, the movable stopper (bottom plate part) 27 and the fixed stopper (band-shaped part) 29 of the assembly stopper mechanism are separated by a predetermined distance.

また、ロータ30及び弁軸21の原点位置を設定すべく、ガイドステム15の小径上部15bの上面(の外周部分)には、所定の幅、高さ、奥行きを持つ断面矩形の閉弁方向用固定ストッパ55が上向きに突設され、ガイドステム15の大径円筒状胴部15aの上部(言い換えれば、軸受穴15cの下端周り)には所定の幅、高さ、奥行きを持つ断面矩形の開弁方向用固定ストッパ56が下向きに突設されている。   Further, in order to set the origin position of the rotor 30 and the valve shaft 21, the upper surface (the outer peripheral portion) of the small diameter upper portion 15b of the guide stem 15 is for a valve closing direction having a predetermined cross section rectangle having a predetermined width, height and depth. A fixed stopper 55 is provided so as to project upward, and an upper portion of the large-diameter cylindrical body portion 15a of the guide stem 15 (in other words, around the lower end of the bearing hole 15c) has a rectangular cross section having a predetermined width, height, and depth. A valve direction fixing stopper 56 projects downward.

弁軸21における雄ねじ部21eの上端部(すなわち、上部雄ねじ部21f)には、閉弁方向用可動ストッパ35が螺合せしめられてロータ30の円板状天井部に抜け止め係止されている。この閉弁方向用可動ストッパ35は、上部雄ねじ部21fに螺合する平面視外形が六角形でその一辺が円弧状とされたナット部35aとこのナット部35aから下向きに突設された所定の幅、高さ、奥行きを持つ断面矩形のストッパ部35sとからなっている。   A valve-closing direction movable stopper 35 is screwed to the upper end portion (that is, the upper male screw portion 21 f) of the male screw portion 21 e in the valve shaft 21 and is locked to the disc-shaped ceiling portion of the rotor 30. . The valve-closing-direction movable stopper 35 includes a nut portion 35a having a hexagonal shape in plan view that is screwed into the upper male screw portion 21f and an arc shape on one side thereof, and a predetermined projecting downward from the nut portion 35a. The stopper portion 35s has a rectangular cross section having a width, a height, and a depth.

また、弁ホルダ23(の天井部32b)の上部には、弁軸21の下部大径部21cの下部を覆うようにして、前記開弁方向用固定ストッパ56に接当係止される開弁方向用可動ストッパ36が一体形成されている。この開弁方向用可動ストッパ36は、弁軸21の下部大径部21cの下部に外装される厚肉円筒部36aとこの厚肉円筒部36aから上向きに突設された所定の幅、高さ、奥行きを持つ断面矩形のストッパ部36sとからなっている。   Further, the valve holder 23 (the ceiling portion 32b of the valve holder 23) is opened at the top thereof so as to cover the lower portion of the lower large-diameter portion 21c of the valve shaft 21 and contacted and locked to the valve-opening direction fixed stopper 56. A direction movable stopper 36 is integrally formed. The valve-opening direction movable stopper 36 includes a thick cylindrical portion 36a externally mounted on the lower portion of the lower large diameter portion 21c of the valve shaft 21, and a predetermined width and height projecting upward from the thick cylindrical portion 36a. And a stopper section 36s having a rectangular section with a depth.

前記ロータ30は、天井付き円筒状のマグネット31とこの天井部に一体結合された連結体32とからなり、連結体32は、弁軸21における上部小径部21bに外嵌されるとともに、前記閉弁方向用可動ストッパ35上に載せられて前記上部小径部21bに溶接固定されている。   The rotor 30 includes a cylindrical magnet 31 with a ceiling and a coupling body 32 integrally coupled to the ceiling portion. The coupling body 32 is externally fitted to the upper small-diameter portion 21b of the valve shaft 21 and the closed portion is closed. It is placed on the valve direction movable stopper 35 and fixed to the upper small diameter portion 21b by welding.

ここで、前記ロータ30の天井部の下面側には、両端部が平面視でD字状に形成されたDカット部を備えた凹部33が設けられ、この凹部33に形成されたDカット部以外の円弧状とされた部分に前記閉弁方向用可動ストッパ35のナット部35aの円弧状とされた一辺が接当した状態で嵌め込まれ、Dカット部に前記ナット部35aの他の2辺が接当した状態で嵌め込まれており、これにより、ロータ30と閉弁方向用可動ストッパ35と弁軸21とは、一体的に回転しながら昇降せしめられる。   Here, on the lower surface side of the ceiling portion of the rotor 30, a concave portion 33 having a D cut portion whose both end portions are formed in a D shape in plan view is provided, and the D cut portion formed in the concave portion 33. The nut portion 35a of the valve-closing-direction movable stopper 35 is fitted in a portion other than the arc-shaped portion in contact with the arc-shaped portion, and the other two sides of the nut portion 35a are fitted into the D-cut portion. The rotor 30, the valve closing direction movable stopper 35, and the valve shaft 21 are raised and lowered while rotating integrally.

一方、前記キャン45の外周には、ヨーク51、ボビン52、コイル53、樹脂モールド54等からなるステータ50が外嵌されている。このステータ50は、その底部に設けられた位置決め固定具(図示省略)により、弁本体10に対して所定の位置に位置決め固定されている。   On the other hand, a stator 50 including a yoke 51, a bobbin 52, a coil 53, a resin mold 54, and the like is fitted on the outer periphery of the can 45. The stator 50 is positioned and fixed at a predetermined position with respect to the valve body 10 by a positioning fixture (not shown) provided at the bottom thereof.

これにより、ロータ30が回転せしめられると、それと一体に弁軸21が回転せしめられ、このとき、前記ねじ送り機構により弁軸21とともに弁ホルダ23が弁体25を伴って昇降せしめられ、これによって、冷媒の通過流量が調整される。   Thereby, when the rotor 30 is rotated, the valve shaft 21 is rotated integrally therewith, and at this time, the valve holder 23 is lifted and lowered together with the valve shaft 21 together with the valve shaft 21 by the screw feeding mechanism. The flow rate of the refrigerant is adjusted.

かかる構成とされた電動弁1の動作をより具体的に説明する。   The operation of the motor-operated valve 1 having such a configuration will be described more specifically.

すなわち、ステータ50に閉弁方向用駆動パターンとなるパルスを供給することにより、ロータ30及び弁軸21が一方向(例えば、平面視時計回り)に回転せしめられ、雌ねじ部15iと雄ねじ部21e(の下部雄ねじ部21g)からなるねじ送り機構により、弁軸21及び閉弁方向用可動ストッパ35が回転しながら(かつ、弁軸21がガイドステム15の軸受穴15cにガイドされながら)下降し、弁体25(の弁体部25a)が弁座11aに着座して弁口11bが閉じられる。   That is, by supplying a pulse as a valve closing direction drive pattern to the stator 50, the rotor 30 and the valve shaft 21 are rotated in one direction (for example, clockwise in plan view), and the female screw portion 15i and the male screw portion 21e ( The valve shaft 21 and the valve closing direction movable stopper 35 are rotated while the valve shaft 21 and the valve-closing direction movable stopper 35 are rotated (while being guided by the bearing hole 15c of the guide stem 15). The valve body 25 (the valve body portion 25a) is seated on the valve seat 11a, and the valve port 11b is closed.

この時点では、閉弁方向用可動ストッパ35は未だ閉弁方向用固定ストッパ55に接当しておらず、ロータ30及び弁軸21の回転下降は停止されず、弁体付勢ばね24が所定量圧縮されるまでパルス供給が継続され、それによって、弁体25が弁座11aに着座したままロータ30、弁軸21、弁ホルダ23等はさらに回転しながら下降する。   At this time, the valve-closing-direction movable stopper 35 is not yet in contact with the valve-closing-direction fixed stopper 55, and the rotation and lowering of the rotor 30 and the valve shaft 21 are not stopped. The pulse supply is continued until the fixed amount is compressed, whereby the rotor 30, the valve shaft 21, the valve holder 23 and the like are further lowered while the valve body 25 is seated on the valve seat 11a.

このときは、弁体25に対して弁軸21及び弁ホルダ23が下降するため、弁体付勢ばね24が圧縮せしめられ、その後、弁体付勢ばね24の圧縮量が所定量となったとき、閉弁方向用可動ストッパ35が閉弁方向用固定ストッパ55に接当して係止され、ロータ30及び弁軸21が最下降位置に達し、ステータ50に閉弁方向用駆動パターンとなるパルス供給が続行されてもロータ30及び弁軸21の下降は強制的に停止される。   At this time, since the valve shaft 21 and the valve holder 23 are lowered with respect to the valve body 25, the valve body biasing spring 24 is compressed, and then the compression amount of the valve body biasing spring 24 becomes a predetermined amount. At this time, the valve-closing direction movable stopper 35 comes into contact with and is locked by the valve-closing direction fixed stopper 55, the rotor 30 and the valve shaft 21 reach the lowest position, and the stator 50 has a valve-closing direction driving pattern. Even if the pulse supply is continued, the lowering of the rotor 30 and the valve shaft 21 is forcibly stopped.

このように、弁体25が弁座11aに着座して弁口11bが閉じられた後においても、閉弁方向用可動ストッパ35が閉弁方向用固定ストッパ55に接当して係止される原点位置に達するまでは、ロータ30、弁軸21、及び弁ホルダ23の回転下降が継続されることにより、弁体付勢ばね24が圧縮されるため、弁体25(の弁体部25a)が弁座11aに強く押し付けられ(この状態を押圧閉弁状態ないし全閉状態と称する)、弁漏れ等を確実に防止できる。   Thus, even after the valve element 25 is seated on the valve seat 11a and the valve port 11b is closed, the valve-closing direction movable stopper 35 comes into contact with and is locked by the valve-closing direction fixed stopper 55. Until the origin position is reached, the rotation of the rotor 30, the valve shaft 21, and the valve holder 23 continues to be lowered, so that the valve body urging spring 24 is compressed, so that the valve body 25 (the valve body portion 25a). Is strongly pressed against the valve seat 11a (this state is referred to as a pressed valve closed state or a fully closed state), and valve leakage or the like can be reliably prevented.

一方、上記原点位置(図1に示される押圧閉弁状態ないし全閉状態)(つまり、弁体25等の最下降位置)から、ステータ50に開弁方向用駆動パターンとなるパルスを供給すると、ロータ30及び弁軸21が前記とは逆方向(例えば、平面視反時計回り)に回転せしめられ、雌ねじ部15iと雄ねじ部21e(の下部雄ねじ部21g)からなるねじ送り機構により、ロータ30、弁軸21、弁ホルダ23及び開弁方向用可動ストッパ36が回転しながら(かつ、弁軸21がガイドステム15の軸受穴15cにガイドされながら)上昇し、これに伴い、弁体25に対する押圧力が弱められ、弁体付勢ばね24が所定量伸張して元のセット状態に戻り、その後、弁体25(の弁体部25a)が弁座11aから離れて弁口11bが開かれる。この場合、ステータ50への供給パルス数に応じて弁体25のリフト量(弁開度=流量)が定まり、さらに前記パルス供給を続けると、最終的には、全開状態となるとともに(図2に示される状態)、開弁方向用可動ストッパ36が開弁方向用固定ストッパ56に接当係止され、これにより、ロータ30、弁軸21、及び弁ホルダ23の回転及び上昇が強制的に停止せしめられる。   On the other hand, when a pulse serving as a valve-opening direction drive pattern is supplied to the stator 50 from the origin position (pressed closed state or fully closed state shown in FIG. 1) (that is, the lowest lowered position of the valve body 25 or the like) The rotor 30 and the valve shaft 21 are rotated in a direction opposite to the above (for example, counterclockwise in plan view), and the rotor 30 is provided by a screw feed mechanism including a female screw portion 15i and a male screw portion 21e (a lower male screw portion 21g thereof). The valve shaft 21, the valve holder 23, and the valve-opening direction movable stopper 36 rise while rotating (and the valve shaft 21 is guided by the bearing hole 15 c of the guide stem 15). The pressure is weakened, the valve body biasing spring 24 expands by a predetermined amount and returns to the original set state, and then the valve body 25 (the valve body portion 25a) is separated from the valve seat 11a and the valve port 11b is opened. In this case, the lift amount (valve opening = flow rate) of the valve element 25 is determined according to the number of pulses supplied to the stator 50, and when the pulse supply is continued, the valve is finally fully opened (FIG. 2). ), The valve-opening direction movable stopper 36 is contacted and locked to the valve-opening direction fixed stopper 56, thereby forcibly rotating and raising the rotor 30, the valve shaft 21, and the valve holder 23. You can stop it.

ここで、本実施形態の電動弁1では、ねじ送り機構を構成する弁軸21(の中間軸状部21a)における雄ねじ部21e(の下部雄ねじ部21g)に隣接してオイル溜り溝21hが設けられるので、前記した電動弁1の動作に際して、詳しくは、弁軸21(弁体25)等を最下降位置(図1に示される全閉状態)と最上昇位置(図2に示される全開状態)との間で移動させる際に、キャン45内に充満(例えば、噴霧状に充満)して弁軸21やガイドステム15に付着する冷媒に含まれるオイル(冷凍サイクル内の冷凍機油)が当該オイル溜り溝21hに溜められる。当該オイル溜り溝21hに溜まったオイルは、雌ねじ部15iと雄ねじ部21eとの相対回転や重力等によって当該オイル溜り溝21hから雌ねじ部15iと雄ねじ部21eとの間(ねじ面間)に侵入し、雌ねじ部15iと雄ねじ部21eとが摺接する際の潤滑剤(油)となって、雌ねじ部15iと雄ねじ部21eとの間(ねじ面間)の摺動抵抗の増加が抑えられるため、動作性を安定させることができる。   Here, in the motor-operated valve 1 of the present embodiment, an oil reservoir groove 21h is provided adjacent to the male screw portion 21e (the lower male screw portion 21g) of the valve shaft 21 (the intermediate shaft portion 21a) constituting the screw feed mechanism. Therefore, in the operation of the motor-operated valve 1, the valve shaft 21 (valve body 25) and the like are moved to the lowest position (fully closed state shown in FIG. 1) and the highest position (fully opened state shown in FIG. 2). ), The oil (refrigeration oil in the refrigeration cycle) contained in the refrigerant that fills the can 45 (for example, fills in a spray state) and adheres to the valve shaft 21 and the guide stem 15 It is stored in the oil pool groove 21h. The oil accumulated in the oil reservoir groove 21h enters between the female thread portion 15i and the male screw portion 21e (between the screw surfaces) from the oil reservoir groove 21h due to relative rotation of the female screw portion 15i and the male screw portion 21e, gravity, or the like. , Since it becomes a lubricant (oil) when the female screw portion 15i and the male screw portion 21e are in sliding contact with each other, an increase in sliding resistance between the female screw portion 15i and the male screw portion 21e (between the screw surfaces) is suppressed. Sex can be stabilized.

また、雌ねじ部15iと雄ねじ部21e(の下部雄ねじ部21g)との間(ねじ面間)に異物を噛み込んだ場合でも、例えば雌ねじ部15iと雄ねじ部21eとが摺接する際に、前記異物が雌ねじ部15iと雄ねじ部21eとの間(ねじ面間)に侵入したオイルとともに排出され、異物噛み込みによる雌ねじ部15iと雄ねじ部21eとの間(ねじ面間)の摺動抵抗の増加が抑えられるため、これによっても、動作性を安定させることができる。   Further, even when a foreign matter is caught between the female screw portion 15i and the male screw portion 21e (the lower male screw portion 21g) (between the screw surfaces), for example, when the female screw portion 15i and the male screw portion 21e are in sliding contact with each other, Is discharged together with the oil that has entered between the female screw portion 15i and the male screw portion 21e (between the screw surfaces), and an increase in sliding resistance between the female screw portion 15i and the male screw portion 21e (between the screw surfaces) due to the inclusion of foreign matter. Therefore, the operability can be stabilized.

なお、上記実施形態では、弁軸21(の中間軸状部21a)において、オイル溜り溝21hが、弁軸21(弁体25)等の最下降位置においてガイドステム15(の雌ねじ部15i)の上端部に対応する位置から弁軸21(弁体25)等の最上昇位置においてガイドステム15(の雌ねじ部15i)の上端部に対応する位置に亘って設けられているが、例えば、図3及び図4に示される如くに、弁軸21(弁体25)等の最下降位置(全閉状態)においてガイドステム15(の雌ねじ部15i)の上端部に対応する位置の近傍にのみ設けてもよいし、図5及び図6に示される如くに、弁軸21(弁体25)等の最上昇位置(全開状態)においてガイドステム15(の雌ねじ部15i)の上端部に対応する位置の近傍にのみ設けてもよい。   In the above embodiment, in the valve shaft 21 (the intermediate shaft portion 21a thereof), the oil reservoir groove 21h is located at the lowest position of the valve shaft 21 (valve body 25) or the like of the guide stem 15 (the female thread portion 15i). It is provided from the position corresponding to the upper end portion to the position corresponding to the upper end portion of the guide stem 15 (the female thread portion 15i) at the highest position such as the valve shaft 21 (valve element 25). As shown in FIG. 4, it is provided only in the vicinity of the position corresponding to the upper end portion of the guide stem 15 (the female thread portion 15 i) in the lowest lowered position (fully closed state) of the valve shaft 21 (valve body 25) or the like. Alternatively, as shown in FIGS. 5 and 6, the valve stem 21 (valve element 25) and the like are at a position corresponding to the upper end portion of the guide stem 15 (the female thread portion 15 i) at the highest lifted position (fully opened state). You may provide only in the vicinity.

図3及び図4に示す例では、オイル溜り溝21hの上下方向長さを(上側に)短くすることで、ガイドステム15の雌ねじ部15iに螺合される下部雄ねじ部21gの上下方向長さを長く設定できるので、特に弁軸21(弁体25)等の最下降位置(全閉状態)においても雌ねじ部15iと雄ねじ部21e(の下部雄ねじ部21g)との噛み合い量(螺合長)を確保できる。また、図5及び図6に示す例では、オイル溜り溝21hの上下方向長さを(下側に)短くすることで、上部雄ねじ部21fの上下方向長さを長く設定でき、この上部雄ねじ部21fをガイドステム15の雌ねじ部15iに螺合させられるので、弁軸21(弁体25)等の最下降位置(全閉状態)においても雌ねじ部15iと雄ねじ部21e(の下部雄ねじ部21g)との噛み合い量(螺合長)を確保できる。   In the example shown in FIGS. 3 and 4, the vertical length of the lower male screw portion 21 g that is screwed into the female screw portion 15 i of the guide stem 15 is shortened (upward) by the vertical length of the oil reservoir groove 21 h. Can be set longer, especially when the valve shaft 21 (valve element 25) and the like are in the lowest lowered position (fully closed state), the meshing amount (screwing length) between the female screw portion 15i and the male screw portion 21e (the lower male screw portion 21g). Can be secured. In the example shown in FIGS. 5 and 6, the vertical length of the upper male screw portion 21f can be set longer by shortening (downward) the vertical length of the oil retaining groove 21h. Since 21f can be screwed into the female threaded portion 15i of the guide stem 15, the female threaded portion 15i and the male threaded portion 21e (the lower male threaded portion 21g) even at the lowest lowered position (fully closed state) of the valve shaft 21 (valve body 25) and the like. The amount of engagement (screwing length) can be secured.

なお、上記実施形態では、オイル溜り溝21hが環状に(つまり、弁軸21の軸線O周りの全周に)形成されているが、弁軸21の軸線O周りの一部に形成してもよいことは勿論である。   In the above-described embodiment, the oil reservoir groove 21h is formed in an annular shape (that is, around the entire circumference of the valve shaft 21 around the axis O). Of course it is good.

[第2実施形態]
図7及び図8は、本発明に係る電動弁の第2実施形態を示す縦断面図であり、図7は全閉状態、図8は全開状態を示す図である。また、図9は、図7のU−U矢視線に従う断面図である。
[Second Embodiment]
7 and 8 are longitudinal sectional views showing a second embodiment of the motor-operated valve according to the present invention. FIG. 7 is a fully closed state, and FIG. 8 is a fully open state. 9 is a cross-sectional view taken along the line U-U in FIG.

本第2実施形態の電動弁2は、上記第1実施形態の電動弁1に対し、主に、ガイドステム15の上端部分の形状が相違しており、その他の構成は略同じである。したがって、第1実施形態の各部に対応する部分には共通の符号を付して重複説明を省略し、以下では、相違点を重点的に説明する。   The motor-operated valve 2 of the second embodiment is mainly different from the motor-operated valve 1 of the first embodiment in the shape of the upper end portion of the guide stem 15, and the other configurations are substantially the same. Accordingly, portions corresponding to the respective portions of the first embodiment are denoted by common reference numerals, and redundant description is omitted, and hereinafter, differences will be mainly described.

本実施形態では、ガイドステム15と弁軸21との間にオイルを溜めるための隙間を形成すべく、ガイドステム15(の小径上部15b)の上端部、すなわち、ねじ送り機構を構成する雌ねじ部15iの上側に隣接するようにして、底面が軸線Oに対して垂直な平坦面で構成される断面凹状のオイル溜り溝15hが設けられている。   In this embodiment, in order to form a gap for storing oil between the guide stem 15 and the valve shaft 21, the upper end portion of the guide stem 15 (the small diameter upper portion 15b), that is, the female screw portion constituting the screw feed mechanism. An oil reservoir groove 15h having a concave cross section whose bottom surface is a flat surface perpendicular to the axis O is provided so as to be adjacent to the upper side of 15i.

この場合、例えば、ガイドステム15の小径上部15bの上面における前記オイル溜り溝15hの外側に、上記原点位置(弁軸21(弁体25)等の最下降位置)を規定する閉弁方向用固定ストッパ55が設けられる。   In this case, for example, the valve closing direction fixing that defines the origin position (the lowest position of the valve shaft 21 (valve body 25), etc.) outside the oil pool groove 15h on the upper surface of the small diameter upper portion 15b of the guide stem 15 is provided. A stopper 55 is provided.

本実施形態の電動弁2でも、ねじ送り機構を構成するガイドステム15(の小径上部15b)における雌ねじ部15iに隣接してオイル溜り溝15hが設けられるので、上記第1実施形態の電動弁1と同様、キャン45内に充満(例えば、噴霧状に充満)して弁軸21やガイドステム15に付着する冷媒に含まれるオイル(冷凍サイクル内の冷凍機油)が当該オイル溜り溝15h(及び、弁軸21側のオイル溜り溝21h)に溜められる。当該オイル溜り溝15h(及び、弁軸21側のオイル溜り溝21h)に溜まったオイルは、雌ねじ部15iと雄ねじ部21eとの相対回転や重力等によって当該オイル溜り溝15h(及び、弁軸21側のオイル溜り溝21h)から雌ねじ部15iと雄ねじ部21eとの間(ねじ面間)に侵入し、雌ねじ部15iと雄ねじ部21eとが摺接する際の潤滑剤(油)となって、雌ねじ部15iと雄ねじ部21eとの間(ねじ面間)の摺動抵抗の増加が抑えられるため、動作性を安定させることができる。   Also in the motor-operated valve 2 of the present embodiment, the oil retaining groove 15h is provided adjacent to the female thread portion 15i in the guide stem 15 (the small-diameter upper portion 15b) constituting the screw feed mechanism, and therefore the motor-operated valve 1 of the first embodiment. Similarly, the oil (refrigerating machine oil in the refrigeration cycle) contained in the refrigerant that fills the can 45 (for example, fills in a spray state) and adheres to the valve shaft 21 and the guide stem 15 is transferred to the oil reservoir groove 15h (and The oil is stored in an oil reservoir groove 21h) on the valve shaft 21 side. The oil accumulated in the oil reservoir groove 15h (and the oil reservoir groove 21h on the valve shaft 21 side) is caused by relative rotation between the female screw portion 15i and the male screw portion 21e, gravity or the like, and the oil reservoir groove 15h (and the valve shaft 21). Side oil reservoir groove 21h) enters between the female threaded portion 15i and the male threaded portion 21e (between the threaded surfaces), and becomes a lubricant (oil) when the female threaded portion 15i and the male threaded portion 21e are in sliding contact with each other. Since an increase in sliding resistance between the portion 15i and the male screw portion 21e (between the screw surfaces) is suppressed, the operability can be stabilized.

また、雌ねじ部15iと雄ねじ部21e(の下部雄ねじ部21g)との間(ねじ面間)に異物を噛み込んだ場合でも、例えば雌ねじ部15iと雄ねじ部21eとが摺接する際に、前記異物が雌ねじ部15iと雄ねじ部21eとの間(ねじ面間)に侵入したオイルとともに排出され、異物噛み込みによる雌ねじ部15iと雄ねじ部21eとの間(ねじ面間)の摺動抵抗の増加が抑えられるため、これによっても、動作性を安定させることができる。   Further, even when a foreign matter is caught between the female screw portion 15i and the male screw portion 21e (the lower male screw portion 21g) (between the screw surfaces), for example, when the female screw portion 15i and the male screw portion 21e are in sliding contact with each other, Is discharged together with the oil that has entered between the female screw portion 15i and the male screw portion 21e (between the screw surfaces), and an increase in sliding resistance between the female screw portion 15i and the male screw portion 21e (between the screw surfaces) due to the inclusion of foreign matter. Therefore, the operability can be stabilized.

なお、上記実施形態では、オイル溜り溝15hが、底面が軸線Oに対して垂直な平坦面で構成される断面凹状を有しているが、例えば図10(A)、(B)に示される如くに、オイル溜り溝15hを、底面が中心軸線O(中心部)に向けて低くなる傾斜面で構成される漏斗状に形成してもよい。   In the above-described embodiment, the oil reservoir groove 15h has a concave cross section formed by a flat surface whose bottom surface is perpendicular to the axis O. For example, FIGS. 10A and 10B show. Similarly, the oil reservoir groove 15h may be formed in a funnel shape having a bottom surface with an inclined surface that becomes lower toward the central axis O (center portion).

また、上記実施形態では、オイル溜り溝15hが環状に(つまり、ガイドステム15の軸線O周りの全周に)形成されている(図9参照)が、例えば図11(A)、(B)に示される如くに、ガイドステム15の軸線O周りの一部(図11に示す例では、ガイドステム15の軸線Oに対して180°離れた対称位置)に形成してもよいことは勿論である。   Further, in the above embodiment, the oil reservoir groove 15h is formed in an annular shape (that is, on the entire circumference around the axis O of the guide stem 15) (see FIG. 9). As shown in FIG. 11, the guide stem 15 may be formed at a part around the axis O (in the example shown in FIG. 11, a symmetrical position separated from the axis O of the guide stem 15 by 180 °). is there.

また、上記第1実施形態では、ねじ送り機構を構成する弁軸21における雄ねじ部21e(の下部雄ねじ部21g)側にオイル溜り溝21hが設けられ、上記第2実施形態では、ねじ送り機構を構成する弁軸21における雄ねじ部21e(の下部雄ねじ部21g)側及びガイドステム15における雌ねじ部15i側の双方にオイル溜り溝21h及びオイル溜り溝15hが設けられているが、ガイドステム15における雌ねじ部15i側にのみオイル溜り溝15hを設けてもよいことは当然である。   Moreover, in the said 1st Embodiment, the oil reservoir groove 21h is provided in the male screw part 21e (the lower male screw part 21g) side in the valve shaft 21 which comprises a screw feed mechanism, In the said 2nd Embodiment, a screw feed mechanism is provided. An oil reservoir groove 21h and an oil reservoir groove 15h are provided on both the male screw portion 21e (the lower male screw portion 21g) side of the valve shaft 21 and the female screw portion 15i side of the guide stem 15, but the female screw in the guide stem 15 is provided. Of course, the oil reservoir groove 15h may be provided only on the portion 15i side.

また、上記実施形態では、弁体が弁座に着座するタイプの電動弁について説明したが、例えば、弁体が最下降位置(通常なら全閉状態となる)にあるときに、弁体と弁座との間に所定の大きさの間隙が形成される(すなわち、弁体が弁座に着座しない)閉弁レスタイプの電動弁においても、前記と同様の作用効果が得られることは詳述するまでも無い。   In the above-described embodiment, the type of motor-operated valve in which the valve body is seated on the valve seat has been described. For example, when the valve body is in the lowest lowered position (normally in a fully closed state), the valve body and the valve It is described in detail that a valve closing-less type electric valve in which a gap of a predetermined size is formed between the seat and the seat (that is, the valve body does not seat on the valve seat) can provide the same effect as described above. Needless to do.

1 電動弁(第1実施形態)
2 電動弁(第2実施形態)
6 第1入出口
7 第2入出口
10 弁本体
11 弁座部材
11a 弁座
11b 弁口
12 弁室
15 ガイドステム
15h オイル溜り溝
15i 雌ねじ部
21 弁軸
21e 雄ねじ部
21f 上部雄ねじ部
21g 下部雄ねじ部
21h オイル溜り溝
23 弁ホルダ
24 弁体付勢ばね
25 弁体
27 底板部
30 ロータ
35 閉弁方向用可動ストッパ
36 開弁方向用可動ストッパ
45 キャン
50 ステータ
55 閉弁方向用固定ストッパ
56 開弁方向用固定ストッパ
1 Motorized valve (first embodiment)
2 Motorized valve (second embodiment)
6 First inlet / outlet 7 Second inlet / outlet 10 Valve body 11 Valve seat member 11a Valve seat 11b Valve port 12 Valve chamber 15 Guide stem 15h Oil reservoir groove 15i Female thread 21 Valve shaft 21e Male thread 21f Upper male thread 21g Lower male thread 21h Oil reservoir groove 23 Valve holder 24 Valve body biasing spring 25 Valve body 27 Bottom plate 30 Rotor 35 Moving stopper for valve closing direction 36 Moving stopper for valve opening direction 45 Can 50 Stator 55 Fixed stopper 56 for valve closing direction Valve opening direction Fixed stopper for

Claims (5)

弁体が設けられるとともに、雄ねじ部が形成された弁軸と、
前記弁軸の雄ねじ部が螺合する雌ねじ部が形成されたガイドステムと、
前記弁体が接離する弁座付きの弁口を有するとともに前記ガイドステムが設けられた弁本体と、
前記弁本体に固定されたキャンと、
前記弁軸を前記ガイドステムに対して回転させるための、前記弁軸に連結されたロータ及びステータを有するモータと、を備え、
前記ガイドステムの前記雌ねじ部と前記弁軸の前記雄ねじ部とで、前記弁体を前記弁座に対して昇降させるためのねじ送り機構が構成されている、冷凍サイクルに組み込まれて使用される電動弁であって、
前記弁軸における前記雄ねじ部隣接して、かつ前記弁軸の最下降位置において前記雌ねじ部の上端部に対応する位置から前記弁軸の最上昇位置において前記雌ねじ部の上端部に対応する位置に亘って、前記ガイドステムと前記弁軸との間にオイルを溜めるための隙間を形成する内側オイル溜り溝が設けられ
前記ガイドステムにおける前記雌ねじ部の上側に隣接して、前記ガイドステムと前記弁軸との間にオイルを溜めるための隙間を形成する外側オイル溜り溝が設けられ、
前記外側オイル溜り溝の底面は、軸線に対して垂直な平坦面もしくは中心軸線に向けて低くなる傾斜面を有し、
前記ガイドステムにおける前記雌ねじ部は、前記ロータの内側空間に配置され、
前記弁軸は、前記雌ねじ部を貫通し、上部に前記ロータが固定され、
開弁時に、前記弁軸は、前記外側オイル溜り溝と前記ロータの間に、前記ロータの内側空間に露出する部分を有し、
前記内側オイル溜り溝と前記外側オイル溜り溝は連続していることを特徴とする電動弁。
A valve shaft provided with a valve body and formed with a male screw part;
A guide stem formed with an internal thread portion into which the external thread portion of the valve shaft is screwed;
A valve body having a valve opening with a valve seat to which the valve body contacts and separates and provided with the guide stem;
A can fixed to the valve body;
A motor having a rotor and a stator coupled to the valve shaft for rotating the valve shaft relative to the guide stem;
In the external thread portion of the valve shaft and the female screw portion of the guide stem, said valve body being screw feed mechanism arrangement for elevating against the valve seat, is used by being incorporated in the refrigeration cycle A motorized valve,
Adjacent to the external thread portion of the valve shaft, and the position corresponding to the upper end of the female threaded portion at the uppermost position of the valve shaft from a position corresponding to the upper end of the female threaded portion at the lowest position of the valve shaft And an inner oil reservoir groove is formed between the guide stem and the valve shaft to form a gap for storing oil ,
Adjacent to the upper side of the female thread portion in the guide stem, an outer oil reservoir groove is provided that forms a gap for storing oil between the guide stem and the valve shaft,
The bottom surface of the outer oil reservoir groove has a flat surface perpendicular to the axis or an inclined surface that decreases toward the central axis,
The female thread portion in the guide stem is disposed in an inner space of the rotor,
The valve shaft passes through the female screw part, and the rotor is fixed to the upper part.
When the valve is opened, the valve shaft has a portion exposed to the inner space of the rotor between the outer oil pool groove and the rotor,
The motor-operated valve characterized in that the inner oil reservoir groove and the outer oil reservoir groove are continuous .
前記ガイドステムにおける前記外側オイル溜り溝の外側に、前記弁軸の最下降位置を規定する閉弁方向用固定ストッパが設けられていることを特徴とする請求項に記載の電動弁。 Electric valve according to claim 1, characterized in that the outside of the outer oil reservoir groove, fixing stopper closing direction which defines the lowermost position of the valve shaft is provided in the guide stem. 前記内側オイル溜り溝又は前記外側オイル溜り溝は、軸線周りの全周もしくは一部に設けられていることを特徴とする請求項1又は2に記載の電動弁。 The motor-operated valve according to claim 1 or 2 , wherein the inner oil reservoir groove or the outer oil reservoir groove is provided on the entire circumference or a part of the circumference of the axis. 前記弁軸は、前記ねじ送り機構の下側部分が前記ガイドステムに摺動自在に内挿されていることを特徴とする請求項1からのいずれか一項に記載の電動弁。 The motor-operated valve according to any one of claims 1 to 3 , wherein a lower portion of the screw feed mechanism is slidably inserted into the guide stem of the valve shaft. 前記弁軸は、前記ねじ送り機構の下側部分が前記雌ねじ部より大径の軸受穴に摺動自在に内挿されていることを特徴とする請求項に記載の電動弁。 5. The motor-operated valve according to claim 4 , wherein the valve shaft is slidably inserted in a bearing hole having a lower diameter than the female screw portion at a lower portion of the screw feed mechanism.
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