JP6643292B2 - Electric valve - Google Patents

Electric valve Download PDF

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Publication number
JP6643292B2
JP6643292B2 JP2017188018A JP2017188018A JP6643292B2 JP 6643292 B2 JP6643292 B2 JP 6643292B2 JP 2017188018 A JP2017188018 A JP 2017188018A JP 2017188018 A JP2017188018 A JP 2017188018A JP 6643292 B2 JP6643292 B2 JP 6643292B2
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valve
valve body
holder
main
pilot
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JP2019060479A (en
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康平 菱谷
康平 菱谷
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Fujikoki Corp
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Fujikoki Corp
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Priority to JP2017188018A priority Critical patent/JP6643292B2/en
Priority to KR1020180069375A priority patent/KR102473774B1/en
Priority to CN201810877531.7A priority patent/CN109578660B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/44—Details of seats or valve members of double-seat 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
    • 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
    • F16K1/48—Attaching valve members to screw-spindles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • 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
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K39/00—Devices for relieving the pressure on the sealing faces
    • F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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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)
  • Fluid-Driven Valves (AREA)

Description

本発明は、冷凍サイクル等に組み込まれて冷媒等の流体の流量制御に使用される電動弁に関する。   The present invention relates to a motor-operated valve incorporated in a refrigeration cycle or the like and used for controlling a flow rate of a fluid such as a refrigerant.

この種の冷凍サイクル等に使用される電動弁として、例えば、弁体、該弁体を軸方向に相対移動可能及び相対回転可能に保持する、雄ねじ部を持つ弁軸、前記弁体と前記弁軸との間に縮装された弁体付勢ばね、前記弁軸の雄ねじ部が螺合する雌ねじ部を持つガイドステム及び前記弁体が接離する弁座が設けられた弁本体、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昇降駆動機構等を備え、前記ガイドステムの円筒部に摺動自在に嵌挿される弁ホルダが前記弁軸の下部に設けられるとともに、該弁ホルダに、前記弁体が軸方向の相対移動可能及び相対回転可能に内挿されて前記弁ホルダの底部に抜け止め係止されたものが知られている（例えば、下記特許文献１等参照）。   Examples of an electrically operated valve used in this type of refrigeration cycle include a valve body, a valve shaft having an external thread portion that holds the valve body so as to be relatively movable and relatively rotatable in an axial direction, the valve body and the valve. A valve body biasing spring compressed between the valve shaft, a guide stem having a female threaded portion into which a male threaded portion of the valve shaft is screwed, and a valve body provided with a valve seat to which the valve body comes and goes, An elevating drive mechanism having a rotor and a stator for rotating and lowering the shaft with respect to the guide stem, and a valve holder slidably fitted into a cylindrical portion of the guide stem is provided below the valve shaft. It is known that the valve body is inserted into the valve holder so as to be relatively movable and relatively rotatable in the axial direction, and is locked at the bottom of the valve holder (for example, the following). Patent Document 1 etc.).

ところで、近年では、前記のような冷凍サイクル等に用いられる電動弁において、製品サイズを変えることなく、大口径（大流量）、高差圧に対応し得ることが求められている。   By the way, in recent years, there has been a demand for a motor-operated valve used in the above-described refrigeration cycle or the like to be able to cope with a large diameter (large flow rate) and a high differential pressure without changing the product size.

詳しくは、近年、空調機器等は大容量化が求められており、その冷凍サイクル等に用いられる電動弁は、大口径かつ両流れでの高差圧対応が必要となる。このような要求を満足するためには、開弁動作時には大きな駆動トルクが必要となる一方、閉弁時には逆流れ方向で高差圧が発生した場合でも閉弁保持を可能とする荷重を弁部品に与える必要がある。   More specifically, in recent years, large-capacity air conditioners and the like have been demanded, and electric valves used in refrigeration cycles and the like need to be large in diameter and compatible with high differential pressure in both flows. In order to satisfy such demands, a large driving torque is required at the time of the valve-opening operation, and at the time of valve closing, a load that can hold the valve closed even when a high differential pressure is generated in the reverse flow direction is applied to the valve component. Need to give to.

大きな駆動トルクを得るためには、昇降駆動装置としてのモータの出力トルクアップ、高磁力のマグネットロータ材等が必要となり、製品の大型化やコストアップを招くおそれがある。また、高差圧での閉弁保持には、大荷重を有するコイルばね等が必要となり、この荷重によって構成部品同士の摩擦抵抗が増大してしまうなどの懸念がある。   In order to obtain a large driving torque, it is necessary to increase the output torque of a motor as a lifting / lowering drive device, a magnet rotor material having a high magnetic force, and the like, which may lead to an increase in size and cost of the product. Further, to maintain the valve closed at a high differential pressure, a coil spring or the like having a large load is required, and there is a concern that the load increases the frictional resistance between the components.

このような問題に対し、例えば下記特許文献２には、弁室内に、大径の弁口を開閉する大径弁体と当該大径弁体内に設けられた小径の弁口を開閉する小径弁体の２つの弁体を設け、その２つの弁体にて小径の弁口と大径の弁口を時間差を持って開弁することにより、大径弁体の受圧荷重を低減して、モータの大型化、ひいては電動弁の大型化を防止する技術が提案されている。   To deal with such a problem, for example, Patent Literature 2 below discloses a large-diameter valve body that opens and closes a large-diameter valve port in a valve chamber and a small-diameter valve that opens and closes a small-diameter valve port provided in the large-diameter valve body. By providing two valve bodies, and opening the small-diameter valve port and the large-diameter valve port with a time difference between the two valve bodies, the pressure receiving load of the large-diameter valve body is reduced, There has been proposed a technique for preventing an increase in the size of a motor-driven valve and, consequently, an increase in the size of a motor-operated valve.

特開２０１６−１５６４４７号公報JP-A-2006-15647 特開平８−２１５５４号公報JP-A-8-21554

しかしながら、上記特許文献２に所載の従来の電動弁では、小径弁体を閉弁方向に付勢するばね（閉弁緩衝ばね）とともに、大径弁体を閉弁方向に付勢するばね（スプリング）が設けられており、前記小径弁体の開弁後に、前記大径弁体が、前記大径弁体を閉弁方向に付勢するばね（スプリング）の付勢力に抗して、前記小径弁体との係合手段の係合作用で引き上げられて開弁する構成となっている。そのため、前記大径弁体の開弁時に、前記ばね（閉弁緩衝ばね）とともに前記ばね（スプリング）を圧縮するトルクが必要となり、駆動トルクを大きくせざるを得ず、更なるトルク低減が望まれている。   However, in the conventional electric valve described in Patent Literature 2, a spring (a valve closing buffer spring) for urging the small diameter valve body in the valve closing direction and a spring (urging the large diameter valve body in the valve closing direction) are used. The large-diameter valve element, after opening the small-diameter valve element, resists the urging force of a spring (spring) for urging the large-diameter valve element in the valve-closing direction. The valve is lifted up and opened by the engaging action of the engaging means with the small diameter valve element. Therefore, when the large-diameter valve element is opened, a torque for compressing the spring (spring) is required together with the spring (valve-closing buffer spring), so that the driving torque must be increased, and further reduction in torque is desired. It is rare.

本発明は、上記事情に鑑みてなされたもので、その目的とするところは、開弁に必要なトルクを小さくして、動作性、耐久性を向上できるとともに、電動弁の更なる小型化を図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 circumstances, and an object of the present invention is to reduce torque required for valve opening, improve operability and durability, and further reduce the size of a motor-operated valve. An object of the present invention is to provide a motor-operated valve that can be achieved.

前記の目的を達成すべく、本発明に係る電動弁は、基本的には、弁室、流入口、及び流出口を有し、前記弁室と前記流出口との間に弁座付き弁口が設けられた弁本体と、前記弁口を開閉するための主弁体と、前記主弁体の背面に形成された背圧室と、前記弁口と前記背圧室とを連通すべく前記主弁体内に設けられた均圧通路と、前記均圧通路を開閉するためのパイロット弁体と、前記パイロット弁体を閉弁方向に付勢する付勢部材と、前記主弁体及び前記パイロット弁体を昇降方向に相対移動可能に保持する弁ホルダと、前記弁ホルダを昇降方向に移動させるためのロータ及びステータを有する昇降駆動装置と、を備え、前記弁ホルダは円筒状を有し、前記弁ホルダ内に、前記主弁体の上部、前記パイロット弁体、及び前記付勢部材が配在されるとともに、前記弁ホルダ内における前記主弁体の背面に前記背圧室が画成されており、前記背圧室と前記弁室とが連通せしめられており、前記昇降駆動装置による前記弁ホルダの上方向への移動に伴って、前記パイロット弁体及び前記主弁体がその順序で異なるリフト量で前記弁ホルダに係合せしめられ、これにより、前記均圧通路が開かれた後に、前記弁口が開くようにされていることを特徴としている。 In order to achieve the above object, a motor-operated valve according to the present invention basically has a valve chamber, an inlet, and an outlet, and a valve port with a valve seat is provided between the valve chamber and the outlet. A valve body provided, a main valve element for opening and closing the valve port, a back pressure chamber formed on the back surface of the main valve element, and the main valve for communicating the valve port with the back pressure chamber. Equalizing passage provided in the valve body, a pilot valve body for opening and closing the equalizing passage, an urging member for urging the pilot valve body in a valve closing direction, the main valve body and the pilot valve A valve holder for holding the body so as to be relatively movable in the elevating direction, and an elevating drive having a rotor and a stator for moving the valve holder in the elevating direction, the valve holder having a cylindrical shape, An upper portion of the main valve body, the pilot valve body, and the biasing member are disposed in the valve holder. Rutotomoni, wherein and back pressure chamber is defined in the rear surface of the main valve body in the valve in the holder, and the valve chamber and the back pressure chamber has been allowed to communicate, the valve holder by the lifting drive unit With the upward movement, the pilot valve element and the main valve element are engaged with the valve holder with different lift amounts in that order, whereby the pressure equalizing passage is opened. It is characterized in that the valve port is opened.

好ましい態様では、前記昇降駆動装置により前記弁ホルダが最下降位置から上方向に連続的に移動せしめられるとき、前記主弁体が前記弁口を閉じたまま、前記付勢部材の付勢力により前記パイロット弁体が前記弁ホルダに係合せしめられるとともに、前記弁ホルダと一緒に前記パイロット弁体が上方向に移動せしめられて前記均圧通路が開かれた後、さらに前記弁ホルダが上方向に移動せしめられると、前記主弁体が前記弁ホルダに係合せしめられ、前記弁ホルダと一緒に前記主弁体が上方向に移動せしめられて前記弁口が開くようにされる。   In a preferred aspect, when the valve holder is continuously moved upward from the lowest position by the elevating drive device, the urging force of the urging member keeps the main valve body closed while the valve port is closed. After the pilot valve element is engaged with the valve holder, the pilot valve element is moved upward together with the valve holder to open the equalizing passage, and then the valve holder is further moved upward. When the main valve is moved, the main valve is engaged with the valve holder, and the main valve is moved upward together with the valve holder so that the valve port is opened.

更に好ましい態様では、前記弁ホルダの天井穴は、前記昇降駆動装置により昇降可能に配在された弁軸に連結される。   In a further preferred aspect, a ceiling hole of the valve holder is connected to a valve shaft arranged to be able to move up and down by the elevating drive device.

別の好ましい態様では、前記弁ホルダと前記主弁体との間の回転摺動抵抗を低減すべく、前記弁ホルダと前記主弁体との間にワッシャが介装される。   In another preferred aspect, a washer is interposed between the valve holder and the main valve body in order to reduce rotational sliding resistance between the valve holder and the main valve body.

別の好ましい態様では、前記付勢部材によって、前記主弁体が前記パイロット弁体を介して閉弁方向に付勢される。   In another preferred aspect, the main valve body is urged in the valve closing direction via the pilot valve body by the urging member.

別の好ましい態様では、前記均圧通路は、前記主弁体内に昇降方向に沿って設けられた縦穴からなる。   In another preferred aspect, the pressure equalizing passage is formed of a vertical hole provided in the main valve body along a vertical direction.

別の好ましい態様では、前記パイロット弁体の前記均圧通路に対する着座面は逆円錐面を有する。   In another preferred aspect, a seating surface of the pilot valve body with respect to the pressure equalizing passage has an inverted conical surface.

本発明に係る電動弁では、昇降駆動装置による弁ホルダの上方向への移動に伴って、パイロット弁体及び主弁体がその順序で異なるリフト量で弁ホルダに係合せしめられ、これにより、均圧通路が開かれた後に、時間差を持って（段階的に）弁口が開くようにされるので、弁口の開弁前に均圧通路が開かれて主弁体の上下の差圧が低減（均圧）されるとともに、パイロット弁体を閉弁方向に付勢する付勢部材は、弁口の開弁時に主弁体を付勢しないため、駆動トルクが小さくて済み、動作性、耐久性を向上できるとともに、電動弁の更なる小型化を図ることができる。   In the motor-operated valve according to the present invention, the pilot valve element and the main valve element are engaged with the valve holder with different lift amounts in that order with the upward movement of the valve holder by the lifting / lowering device. After the equalizing passage is opened, the valve port is opened with a time lag (in a stepwise manner). Therefore, before the valve port is opened, the equalizing passage is opened and the upper and lower differential pressures of the main valve body are increased. Is reduced (equalizing pressure), and the urging member for urging the pilot valve body in the valve closing direction does not urge the main valve body when the valve port is opened. In addition, the durability can be improved, and the size of the electric valve can be further reduced.

また、パイロット弁体の均圧通路に対する着座面が逆円錐面を有するので、開弁直後の流量変化の勾配（立ち上がり）を小さくでき、低流量制御域の制御性を高めることができる。   Further, since the seating surface of the pilot valve element with respect to the pressure equalizing passage has an inverted conical surface, the gradient (rise) of the flow rate change immediately after the valve is opened can be reduced, and the controllability of the low flow rate control region can be improved.

本発明に係る電動弁の一実施形態を示す縦断面図。1 is a longitudinal sectional view showing an embodiment of a motor-operated valve according to the present invention. 図１に示される電動弁の動作説明に供される、閉弁状態を示す要部拡大縦断面図。FIG. 2 is an enlarged longitudinal sectional view of a main part showing a closed state, which is used for explaining the operation of the motor-operated valve shown in FIG. 1. 図１に示される電動弁の動作説明に供される、開弁途中状態を示す要部拡大縦断面図。FIG. 2 is an enlarged longitudinal sectional view of a main part showing a valve opening halfway state for explaining the operation of the motor-operated valve shown in FIG. 1. 図１に示される電動弁の動作説明に供される、均圧通路の開状態を示す要部拡大縦断面図。FIG. 2 is an enlarged longitudinal sectional view of a main part showing an open state of a pressure equalizing passage, which is used for explaining the operation of the electric valve shown in FIG. 1. 図１に示される電動弁の動作説明に供される、弁口の開状態を示す要部拡大縦断面図。FIG. 2 is an enlarged longitudinal sectional view of a main part showing an open state of a valve port, which is used for explaining the operation of the electric valve shown in FIG. 1. 図１に示される電動弁の他例を示す縦断面図。FIG. 2 is a longitudinal sectional view showing another example of the motor-operated valve shown in FIG. 1. 図１及び図６に示される電動弁の流量制御特性図。FIG. 7 is a flow control characteristic diagram of the electric valve shown in FIGS. 1 and 6.

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

図１は、本発明に係る電動弁の一実施形態を示す縦断面図、図２〜図５は、図１に示される電動弁の動作説明に供される図である。   FIG. 1 is a longitudinal sectional view showing an embodiment of a motor-operated valve according to the present invention, and FIGS. 2 to 5 are views provided for explaining the operation of the motor-operated valve shown in FIG.

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 the present specification, descriptions indicating positions and directions such as up and down, left and right, front and back, etc. are given for convenience according to the drawings in order to avoid complicating the description, and the positions and directions in an actual use state are described. Does not always 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 of the drawings, a gap formed between members, a separation distance between members, and the like are larger than 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に形成された雌ねじ部１５ｉに、その軸状部２１ａ外周に形成された雄ねじ部２１ｅ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 cylindrical valve body 10 having a bottom and an open upper surface, a can 45 having a lower end hermetically joined to the outer peripheral side of an upper end surface of the valve body 10 by welding or the like. A guide stem 15 with a flange-shaped disk 18 fixed to the inner peripheral side of the upper end face portion by welding or the like, a female screw portion 15i formed on a small-diameter upper portion 15b of the guide stem 15, and formed on the outer periphery of the shaft portion 21a. A valve shaft 21 into which a male screw portion 21e is screwed, a rotor 30 connected and fixed to the valve shaft 21 so as to be integrally rotatable, and a stator externally fitted to the outer periphery of the can 45 for driving the rotor 30 to rotate. 50.

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１５ｉと弁軸２１の雄ねじ部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, the rotor 30 and the stator 50 constitute a stepping motor, and the female thread 15i of the guide stem 15 and the male thread 21e of the valve shaft 21 constitute a screw feed mechanism. The lift drive device for raising and lowering while rotating the valve shaft 21 (and a valve holder 23 described later) is configured.

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。なお、図示例では、弁座部材１１における弁座１１ａ周り（つまり、後述する主弁体２５周り）に、短円筒状の縦壁１１ｃが立設されている。   The valve body 10 is made of, for example, a metal plate material by press working, and a valve seat member 11 having a valve port 11b with a valve seat 11a is fixed to a bottom portion 10b thereof by brazing or the like. The lower part of the guide stem 15 is inserted into the upper part. In the illustrated example, a short cylindrical vertical wall 11c is provided upright around the valve seat 11a of the valve seat member 11 (that is, around a main valve body 25 described later).

前記弁本体１０内に画成される弁室１２の一側方には、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 a valve chamber 12 defined in the valve body 10 by brazing or the like. The second inlet / outlet 7 is joined 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、ガイドステム１５の雌ねじ部１５ｉに螺合する雄ねじ部２１ｅを持つ軸状部２１ａ、及び、該軸状部２１ａ（雄ねじ部２１ｅ）より下側の鍔状部２１ｄ付きの厚肉円板状の下部大径連結部２１ｃを有する。弁軸２１の下端部には、その下部大径連結部２１ｃの外周に設けられた鍔状部２１ｄにその天井穴部分が連結固定されるとともに（図示例では、かしめ部２３ａによるかしめ固定）、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円筒状の弁ホルダ２３が保持されている。つまり、本例では、円筒状の弁ホルダ２３の天井穴は、弁軸２１の下部大径連結部２１ｃにより閉塞されるとともに、当該弁ホルダ２３は、弁軸２１と一体に回転しながら昇降せしめられる。この弁ホルダ２３の下部には、主弁体２５の上部が上下方向（昇降方向）に摺動自在に挿入（内挿）されて保持されるとともに、弁ホルダ２３における主弁体２５の上側に、パイロット弁体２７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。   The valve shaft 21 includes an upper small-diameter portion 21b to which the connecting body 32 of the rotor 30 is externally fitted, a shaft portion 21a having a male screw portion 21e screwed to the female screw portion 15i of the guide stem 15, and a shaft portion 21a. It has a thick disk-shaped lower large-diameter connection portion 21c with a flange portion 21d below the 21a (male thread portion 21e). At the lower end of the valve shaft 21, the ceiling hole portion is connected and fixed to a flange portion 21d provided on the outer periphery of the lower large-diameter connection portion 21c (in the illustrated example, the caulked portion 23a is fixed by caulking). A cylindrical valve holder 23 slidably fitted in the large-diameter cylindrical body 15a of the guide stem 15 is held. That is, in this example, the ceiling hole of the cylindrical valve holder 23 is closed by the lower large-diameter connecting portion 21 c of the valve shaft 21, and the valve holder 23 is moved up and down while rotating integrally with the valve shaft 21. Can be At the lower part of the valve holder 23, the upper part of the main valve body 25 is slidably inserted (inserted) in the vertical direction (elevation direction) and held. The pilot valve element 27 is slidably inserted (interpolated) in the vertical direction (elevation direction) and held.

主弁体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部材から作製されており、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の上部に連なる円柱状の胴部２５ｂ、及び、該胴部２５ｂの上部に連なる大径頭部２５ｃを有する。   In this example, the main valve body 25 is made of a stepped shaft-shaped member arranged in the vertical direction (the direction of the axis O) using, for example, metal as a raw material, and is provided in the valve seat 11a (the valve port 11b). An inverted truncated cone-shaped valve body 25a whose lower part is inserted and seated, a cylindrical body 25b connected to the upper part of the valve body 25a, and a large-diameter head 25c connected to the upper part of the body 25b. Have.

弁ホルダ２３の下端部には、前記主弁体２５（の大径頭部２５ｃ）を、間に薄肉の環状円板からなるワッシャ２９を挟んで抜け止め係止するとともに、前記主弁体２５の胴部２５ｂを挿通する通し穴を画成する内鍔状掛止部２３ｂが内向きに突設されている。弁ホルダ２３が弁本体１０に対して上方向に移動せしめられるとき、前記主弁体２５の大径頭部２５ｃ（の下面）の外周部分（言い換えれば、胴部２５ｂと大径頭部２５ｃとの間の下向きの円環状の段丘面）からなる外鍔状係止部２５ｄに弁ホルダ２３の内鍔状掛止部２３ｂに配置されたワッシャ２９が引っ掛けられて抜け止め係止されるようになっている。なお、弁ホルダ２３（の内鍔状掛止部２３ｂ）と主弁体２５（の外鍔状係止部２５ｄ）との間に介装される前記ワッシャ２９は、弁ホルダ２３と主弁体２５との間の回転摺動抵抗を低減する（言い換えれば、前記昇降駆動装置による弁ホルダ２３の回転運動が主弁体２５に伝達するのを防止する）ために設けられている。   At the lower end of the valve holder 23, the (large-diameter head 25c) of the main valve body 25 is stopped and locked with a washer 29 formed of a thin annular disk interposed therebetween. An inner collar-shaped hooking portion 23b that defines a through hole through which the body portion 25b is inserted is protruded inward. When the valve holder 23 is moved upward with respect to the valve body 10, the outer peripheral portion (in other words, the trunk 25 b and the large-diameter head 25 c) of (the lower surface of) the large-diameter head 25 c of the main valve body 25. The washer 29 arranged on the inner collar-shaped hooking portion 23b of the valve holder 23 is hooked on the outer collar-shaped locking portion 25d made of a downward annular step surface between the two) so as to be locked. Has become. The washer 29 interposed between (the inner collar-shaped hooking portion 23b of) the valve holder 23 and (the outer collar-shaped locking portion 25d of) the main valve body 25 includes the valve holder 23 and the main valve body. This is provided to reduce the rotational sliding resistance between the main valve body 25 and the main body 25 (in other words, to prevent the rotational movement of the valve holder 23 from being transmitted to the main valve body 25 by the elevation drive device).

また、弁口１１ｂと（弁ホルダ２３内における）主弁体２５の上側（背面）に形成される背圧室２０とを連通する均圧通路（パイロット通路ともいう）２６Ａを構成すべく、前記主弁体２５内には、上下方向（軸線Ｏ方向）に沿って貫通するように段付きかつ弁口１１ｂより小径の縦穴２６が設けられている。   In order to form a pressure equalizing passage (also referred to as a pilot passage) 26 </ b> A that communicates the valve port 11 b with the back pressure chamber 20 formed above (in the back of) the main valve body 25 (in the valve holder 23). In the main valve body 25, a vertical hole 26 having a step and having a smaller diameter than the valve port 11b is provided so as to penetrate in the vertical direction (the direction of the axis O).

一方、主弁体２５（の縦穴２６）の上面には、ばね受け部２７ｂ付きの概略円筒状のパイロット弁体２７が載せられている。このパイロット弁体２７の下端（下面）には、前記主弁体２５の縦穴２６（均圧通路２６Ａ）の上端縁部（パイロット弁口）に接離して当該均圧通路２６Ａを開閉する、例えばゴム等の弾性材料から作製された短円柱状の弁体部材２８が保持固定されている（図示例では、かしめ部２７ａによるかしめ固定）。また、パイロット弁体２７の下部外周には、鍔状のばね受け部２７ｂが外向きに突設され、このばね受け部２７ｂ（の上面）と弁軸２１の下部大径連結部２１ｃ（の下面外周に設けられた円環状の窪み面）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（付勢部材）２４が縮装されている。この弁体付勢ばね２４（の付勢力）により、パイロット弁体２７が常時下向き（閉弁方向）に付勢されるとともに、パイロット弁体２７を介して主弁体２５が下向き（閉弁方向）に付勢されている。   On the other hand, on the upper surface of (the vertical hole 26 of) the main valve body 25, a substantially cylindrical pilot valve body 27 with a spring receiving portion 27b is mounted. At the lower end (lower surface) of the pilot valve body 27, an upper end edge (pilot valve port) of the vertical hole 26 (equalizing passage 26A) of the main valve body 25 is opened and closed to open and close the equalizing passage 26A. A short columnar valve body member 28 made of an elastic material such as rubber is held and fixed (in the illustrated example, it is swaged and fixed by the swaging portion 27a). A flange-shaped spring receiving portion 27b is provided on the outer periphery of the lower portion of the pilot valve body 27 so as to protrude outward, and the upper surface of the spring receiving portion 27b and the lower surface of the lower large-diameter connecting portion 21c of the valve shaft 21 are formed. A valve body biasing spring (biasing member) 24 formed of a cylindrical compression coil spring for pressing and buffering the valve body is compressed between the valve body and an annular concave surface provided on the outer periphery. The pilot valve element 27 is constantly urged downward (in the valve closing direction) by (the urging force of) the valve element urging spring 24, and the main valve element 25 is downwardly urged (in the valve closing direction) via the pilot valve element 27. ).

弁ホルダ２３の中腹部内周には、前記鍔状のばね受け部２７ｂに係合せしめられる大きさの内周段差部２３ｃが形成されている。弁ホルダ２３が弁本体１０に対して上方向に移動せしめられるとき、弁ホルダ２３の内周段差部（上向きの円環状の段丘面）２３ｃにより、パイロット弁体２７のばね受け部２７ｂ（の下面）の外周部分からなる鍔状係止部２７ｃが引っ掛けられて掛止されるようになっている。   An inner peripheral step portion 23c having a size to be engaged with the flange-shaped spring receiving portion 27b is formed on the inner periphery of the middle portion of the valve holder 23. When the valve holder 23 is moved upward with respect to the valve body 10, the lower surface of the spring receiving portion 27 b of the pilot valve body 27 (the lower surface of the spring receiving portion 27 b of the pilot valve body 27) is formed by the inner peripheral step portion (upward annular step surface) 23 c of the valve holder 23. The collar-shaped locking portion 27c composed of the outer peripheral portion is hooked and locked.

また、本例では、弁ホルダ２３（における前記内周段差部２３ｃの下側）に複数個の貫通穴（横穴）２３ｄが設けられ、前記背圧室２０（弁ホルダ２３の内側）と弁室１２とは、前記貫通穴２３ｄ等を介して常時連通せしめられている。   Further, in this example, a plurality of through holes (lateral holes) 23d are provided in the valve holder 23 (under the inner peripheral step 23c), and the back pressure chamber 20 (the inside of the valve holder 23) and the valve chamber are provided. 12 is always in communication through the through hole 23d and the like.

上記した弁軸２１、弁ホルダ２３、並びに、弁ホルダ２３内に上下方向（昇降方向）に相対移動可能及び相対回転可能に保持された主弁体２５、パイロット弁体２７、及び弁体付勢ばね２４は、主弁体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 above-described valve shaft 21, the valve holder 23, and the main valve body 25, the pilot valve body 27, and the valve body biasing which are held in the valve holder 23 so as to be relatively movable and vertically rotatable in the vertical direction (elevation direction). When the main valve body 25 is separated from the valve seat 11a (valve open state), the spring 24 is moved up and down while rotating substantially integrally.

また、この場合、図１に示される如くの閉弁状態（弁ホルダ２３、主弁体２５、及びパイロット弁体２７が最下降位置にある状態であって、均圧通路２６Ａが閉、弁口１１ｂが閉の状態）においては、パイロット弁体２７の鍔状係止部２７ｃ（の下面）と弁ホルダ２３の内周段差部２３ｃ（上向きの段丘面）とは（上下方向で）所定の距離Ｌａだけ離隔し、主弁体２５の外鍔状係止部２５ｄ（の下面）と弁ホルダ２３の内鍔状掛止部２３ｂに配置されたワッシャ２９（の上面）とは（上下方向で）所定の距離Ｌｂだけ離隔しており、Ｌｂ＞Ｌａの関係となるように各離隔距離が設定されている（図２参照）。これにより、昇降駆動装置による弁ホルダ２３の上方向への移動に伴って、パイロット弁体２７及び主弁体２５及びがその順序で異なるリフト量（位置）で弁ホルダ２３に係合せしめられるようになっている（後で詳述）。   In this case, the valve is closed as shown in FIG. 1 (the valve holder 23, the main valve body 25, and the pilot valve body 27 are in the lowest position, the pressure equalizing passage 26A is closed, and the valve port is closed). 11b (closed state), a predetermined distance (in the vertical direction) between (the lower surface of) the flange-shaped locking portion 27c of the pilot valve body 27 and the inner peripheral stepped portion 23c (upward step surface) of the valve holder 23. The upper collar 25d (lower surface) of the main valve body 25 and the washer 29 (upper surface) disposed on the inner collar 23b of the valve holder 23 are separated by La (in the vertical direction). They are separated by a predetermined distance Lb, and the respective separation distances are set so that Lb> La (see FIG. 2). Accordingly, the pilot valve body 27 and the main valve body 25 can be engaged with the valve holder 23 with different lift amounts (positions) in that order in accordance with the upward movement of the valve holder 23 by the lifting / lowering drive device. (Detailed later).

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 positions of the rotor 30 and the valve shaft 21, on the upper surface of the small-diameter upper portion 15b of the guide stem 15, a fixed stopper 55 for a valve closing direction having a rectangular cross section having a predetermined width, height and depth is directed upward. A fixed stopper 56 for a valve opening direction having a rectangular cross section having a predetermined width, height, and depth is provided to protrude downward from an upper portion of the large-diameter cylindrical body portion 15a of the guide stem 15.

弁軸２１における雄ねじ部２１ｅの上端部には、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、雄ねじ部２１ｅ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 movable stopper 35 for the valve closing direction is screwed to the upper end of the male screw portion 21 e of the valve shaft 21 and is locked to the disc-shaped ceiling portion of the rotor 30 so as not to come off. The movable stopper 35 for the valve closing direction has a nut portion 35a having a hexagonal external shape in plan view and an arc shape on one side screwed to the male screw portion 21e, and a predetermined width protruding downward from the nut portion 35a. , A stopper section 35s having a rectangular cross section having a height and a depth.

また、弁軸２１の雄ねじ部２１ｅの下端部には、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が螺合せしめられて前記弁軸２１の下部大径連結部２１ｃに抜け止め係止されている。この開弁方向用可動ストッパ３６は、雄ねじ部２１ｅに螺合するナット部３６ａとこのナット部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。   A movable stopper 36 for the valve opening direction, which is engaged with the fixed stopper 56 for the valve opening direction, is screwed to the lower end of the male screw portion 21 e of the valve shaft 21. It is locked by the diameter connecting portion 21c. The movable stopper 36 for the valve opening direction includes a nut 36a screwed into the male screw 21e, and a stopper 36s having a rectangular cross section having a predetermined width, height, and depth projecting upward from the nut 36a. Has become.

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 connecting body 32 integrally connected to the ceiling. The connecting body 32 is fitted to the upper small-diameter portion 21b of the valve shaft 21 and is closed. It is mounted 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 having both ends formed in a D-shape in plan view is provided, and the D-cut portion formed in the concave portion 33 is provided. One side of the nut portion 35a of the valve closing direction movable stopper 35, which is formed in an arcuate shape, is in contact with the arcuate portion other than the other portion, and the other two sides of the nut portion 35a are inserted into the D cut portion. The rotor 30, the valve closing direction movable stopper 35, and the valve shaft 21 are moved up and down while rotating integrally with each other.

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 composed of a yoke 51, a bobbin 52, a coil 53, a resin mold 54 and the like is fitted around 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.

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がパイロット弁体２７及び主弁体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。   Thus, when the rotor 30 is rotated, the valve shaft 21 is rotated integrally therewith. At this time, the valve holder 23 is moved together with the pilot valve body 27 and the main valve body 25 together with the valve shaft 21 by the screw feed mechanism. The refrigerant is raised and lowered, thereby adjusting the flow rate of the refrigerant.

上記構成とされた電動弁１の動作（特に、その開弁動作）を図２〜図５を参照しながらより具体的に説明する。   The operation of the electric valve 1 configured as described above (particularly, the valve opening operation) will be described more specifically with reference to FIGS.

なお、本実施形態の電動弁１では、流体（冷媒）は、双方向（第１入出口６から第２入出口７に向かう方向（横→下）と、第２入出口７から第１入出口６に向かう方向（下→横）との双方向）に流されるようになっているが、電動弁１の動作自体は流体（冷媒）の流れ方向で基本的に同じであるので、以下では、圧力キャンセル（バランス）効果を発揮し得る横→下流れの場合を代表して説明する。よって、以下の動作中では、第１入出口６が流入口（高圧側）、第２入出口７が流出口（低圧側）となっている。   In the motor-operated valve 1 of the present embodiment, the fluid (refrigerant) flows bidirectionally (in the direction from the first inlet / outlet 6 to the second inlet / outlet 7 (from side to bottom) and from the second inlet / outlet 7 to the first inlet / outlet). Although the flow is made to flow in the direction toward the outlet 6 (in both directions from down to side), the operation itself of the motor-operated valve 1 is basically the same in the flow direction of the fluid (refrigerant). A description will be given of a case of a horizontal to downward flow that can exert a pressure canceling (balance) effect. Therefore, during the following operation, the first inlet / outlet 6 is an inlet (high pressure side), and the second inlet / outlet 7 is an outlet (low pressure side).

図２に示される如くの閉弁状態では、可動ストッパ３５が固定ストッパ５５に接当して係止され、ロータ３０、弁軸２１、及び弁ホルダ２３が最下降位置にある。このとき、パイロット弁体２７の鍔状係止部２７ｃ（の下面）と弁ホルダ２３の内周段差部２３ｃ（上向きの段丘面）とは所定の距離Ｌａだけ離隔し、主弁体２５の外鍔状係止部２５ｄ（の下面）と弁ホルダ２３の内鍔状掛止部２３ｂに配置されたワッシャ２９（の上面）とは所定の距離Ｌｂ（＞Ｌａ）だけ離隔しており、弁体付勢ばね２４（の付勢力）によって、パイロット弁体２７が下向き（閉弁方向）に付勢されるとともに、パイロット弁体２７を介して主弁体２５が下向き（閉弁方向）に付勢されている。よって、パイロット弁体２７（の弁体部材２８の下面）が主弁体２５の縦穴２６（均圧通路２６Ａ）の上端縁部（パイロット弁口）に圧接（着座）されて均圧通路２６Ａが閉じられるとともに、主弁体２５（の弁体部２５ａ）が弁本体１０の弁座１１ａに圧接（着座）されて弁口１１ｂが閉じられている。   In the valve closed state as shown in FIG. 2, the movable stopper 35 contacts and is locked by the fixed stopper 55, and the rotor 30, the valve shaft 21, and the valve holder 23 are at the lowest position. At this time, the flange-shaped engaging portion 27c (lower surface) of the pilot valve body 27 and the inner peripheral step portion 23c (upward step surface) of the valve holder 23 are separated by a predetermined distance La, and The flange-shaped engaging portion 25d (the lower surface) and the washer 29 (the upper surface) disposed on the inner flange-shaped engaging portion 23b of the valve holder 23 are separated by a predetermined distance Lb (> La). Pilot valve body 27 is urged downward (valve closing direction) by (urging force of) spring 24, and main valve body 25 is urged downward (valve closing direction) via pilot valve body 27. Have been. Accordingly, the pilot valve body 27 (the lower surface of the valve body member 28) is pressed (seated) on the upper edge (pilot valve port) of the vertical hole 26 (equalizing passage 26A) of the main valve body 25, and the equalizing passage 26A is formed. At the same time, the main valve body 25 (the valve body portion 25a thereof) is pressed against (seated on) the valve seat 11a of the valve body 10, and the valve port 11b is closed.

図２に示される閉弁状態からステータ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が回転せしめられ、雌ねじ部１５ｉと雄ねじ部２１ｅ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が回転しながら上昇する。そのリフト量がＬａに達するまで（図３に示される状態まで）は、弁ホルダ２３の内周段差部２３ｃにパイロット弁体２７の鍔状係止部２７ｃは掛止されず、弁体付勢ばね２４（の付勢力）によって、均圧通路２６Ａ及び弁口１１ｂが閉じられた状態（図２と同様の閉弁状態）が保持される。このとき、弁体付勢ばね２４の圧縮量は次第に減少して、その全長は次第に長くなる。   When a pulse that is a driving pattern for the valve opening direction is supplied to the stator 50 from the valve closing state illustrated in FIG. 2, the rotor 30 and the valve shaft 21 are rotated, and the screw feed mechanism including the female screw portion 15i and the male screw portion 21e causes The rotor 30, the valve shaft 21, the valve holder 23, and the movable stopper 36 for the valve opening direction rise while rotating. Until the lift amount reaches La (until the state shown in FIG. 3), the flange-shaped locking portion 27c of the pilot valve body 27 is not engaged with the inner peripheral step 23c of the valve holder 23, and the valve body is biased. The state where the pressure equalizing passage 26A and the valve port 11b are closed (the valve closed state similar to FIG. 2) is maintained by (the biasing force of) the spring 24. At this time, the amount of compression of the valve body urging spring 24 gradually decreases, and the entire length gradually increases.

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がさらに回転しながら上昇せしめられ、そのリフト量がＬａに達すると、図３に示される如くに、（弁体付勢ばね２４の付勢力によって）パイロット弁体２７の鍔状係止部２７ｃが弁ホルダ２３の内周段差部２３ｃと係合する。そのリフト量がＬａを超えてＬｂに達するまで（図４に示される状態まで）は、主弁体２５の上下の圧力差によって、主弁体２５（の弁体部２５ａ）が弁本体１０の弁座１１ａに押し付けられたまま（つまり、主弁体２５が弁口１１ｂを閉じたまま）で、パイロット弁体２７は、前記鍔状係止部２７ｃと前記内周段差部２３ｃとの係合によって、弁ホルダ２３とともに（一体に）移動（上昇）せしめられ、パイロット弁体２７（の弁体部材２８の下面）が主弁体２５の縦穴２６（均圧通路２６Ａ）の上端縁部（パイロット弁口）から離れて均圧通路２６Ａが開口せしめられる。なお、リフト量がＬａを超えると、鍔状係止部２７ｃが内周段差部２３ｃと係合するため、弁体付勢ばね２４の全長は変化しない。第１入出口（流入口）６から弁室１２を介して前記背圧室２０に流れ込んだ流体は、主弁体２５内の均圧通路２６Ａを介して、弁口１１ｂに流れ込む。当該弁口１１ｂに流れ込む流体（つまり、第２入出口（流出口）７へ流れ出る流体）の流量は、弁ホルダ２３及びパイロット弁体２７の上昇（リフト量）に伴って次第に大きくなる（小流量制御域）。この小流量制御域において、主弁体２５に作用する押し下げ力（閉弁方向に働く力）と押し上げ力（開弁方向に働く力）とがバランス（差圧がキャンセル）されることになる。   The rotor 30, the valve shaft 21, the valve holder 23, and the movable stopper 36 for the valve opening direction are further raised while rotating, and when the lift amount reaches La, as shown in FIG. The flange-shaped locking portion 27c of the pilot valve body 27 engages with the inner peripheral step portion 23c of the valve holder 23 (by the urging force of 24). Until the lift amount exceeds La and reaches Lb (until the state shown in FIG. 4), the main valve body 25 (of the valve body portion 25a) is moved to the valve body 10 by the pressure difference between the upper and lower sides of the main valve body 25. While being pressed against the valve seat 11a (that is, the main valve body 25 closes the valve port 11b), the pilot valve body 27 engages with the flange-shaped locking portion 27c and the inner peripheral step portion 23c. As a result, the pilot valve body 27 (the lower surface of the valve body member 28) is moved (increased) together with the valve holder 23 (integrally) and the upper end edge (pilot) of the vertical hole 26 (equalizing passage 26A) of the main valve body 25 The pressure equalizing passage 26A is opened away from the valve opening). When the lift amount exceeds La, the entire length of the valve element biasing spring 24 does not change because the flange-shaped locking portion 27c engages with the inner peripheral step portion 23c. The fluid flowing from the first inlet / outlet (inlet) 6 into the back pressure chamber 20 via the valve chamber 12 flows into the valve port 11b via the equalizing passage 26A in the main valve body 25. The flow rate of the fluid flowing into the valve port 11b (that is, the fluid flowing out to the second inlet / outlet (outlet) 7) gradually increases as the valve holder 23 and the pilot valve body 27 rise (lift amount) (small flow rate). Control area). In this small flow control region, the pushing force (force acting in the valve closing direction) acting on the main valve body 25 and the pushing force (force acting in the valve opening direction) are balanced (differential pressure is canceled).

前記のように均圧通路２６Ａが開かれた後、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がさらに回転しながら上昇せしめられ、そのリフト量がＬｂ（＞Ｌａ）に達すると、図４に示される如くに、主弁体２５の外鍔状係止部２５ｄが弁ホルダ２３の内鍔状掛止部２３ｂに配置されたワッシャ２９と係合する。そして、そのリフト量がＬｂを超えると、図５に示される如くに、主弁体２５は、前記外鍔状係止部２５ｄと前記内鍔状掛止部２３ｂに配置されたワッシャ２９との係合によって、弁ホルダ２３とともに（一体に）移動（上昇）せしめられ、主弁体２５（の弁体部２５ａ）が弁本体１０の弁座１１ａから離れて弁口１１ｂが開口せしめられる。第１入出口（流入口）６から弁室１２に流れ込んだ流体は、弁口１１ｂ（均圧通路２６Ａより相対的に大径）に流れ込み、当該弁口１１ｂに流れ込む流体（つまり、第２入出口（流出口）７へ流れ出る流体）の流量は、弁ホルダ２３及び主弁体２５の上昇（リフト量）に伴って次第に大きくなる（大流量制御域）。この大流量制御域においても、主弁体２５に作用する押し下げ力（閉弁方向の力）と押し上げ力（開弁方向の力）とがバランス（差圧がキャンセル）されることになる。 After the pressure equalizing passage 26A is opened as described above, the rotor 30, the valve shaft 21, the valve holder 23 and the valve opening direction movable stopper 36 are further rotated and further raised, and the lift amount is Lb (> La). As shown in FIG. 4, the outer flange-shaped locking portion 25d of the main valve body 25 engages with the washer 29 arranged on the inner flange-shaped engaging portion 23b of the valve holder 23, as shown in FIG. When the lift amount is more than L b, the as shown in FIG. 5, the main valve body 25, a washer 29 disposed within the collar-shaped retaining portion 23b and the outer flange-like locking part 25d The main valve body 25 (the valve body portion 25a thereof) is moved (increased) together with the valve holder 23 (integrally) by the engagement of the valve holder 23, and is separated from the valve seat 11a of the valve body 10 to open the valve port 11b. The fluid flowing from the first inlet / outlet (inlet) 6 into the valve chamber 12 flows into the valve port 11b (having a relatively larger diameter than the pressure equalizing passage 26A) and flows into the valve port 11b (that is, the second inlet port). The flow rate of the fluid flowing out to the outlet (outflow port) 7 gradually increases as the valve holder 23 and the main valve body 25 rise (lift amount) (large flow rate control region). Also in this large flow rate control region, the pushing force (force in the valve closing direction) acting on the main valve body 25 and the pushing force (force in the valve opening direction) are balanced (differential pressure is canceled).

なお、最終的には、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。   Finally, the movable stopper 36 abuts and locks on the fixed stopper 56 for the valve opening direction, thereby forcibly stopping the rotation and rising of the rotor 30, the valve shaft 21, and the valve holder 23. .

以上で説明したように、本実施形態の電動弁１では、昇降駆動装置による弁ホルダ２３の上方向への移動に伴って、パイロット弁体２７及び主弁体２５がその順序で異なるリフト量で弁ホルダ２３に係合せしめられ、これにより、均圧通路２６Ａが開かれた後に、時間差を持って（段階的に）弁口１１ｂが開くようにされる（言い換えれば、前記均圧通路２６Ａ及び前記弁口１１ｂがその順で段階的に開くようにされる）ので、弁口１１ｂの開弁前に均圧通路２６Ａが開かれて主弁体２５の上下の差圧が低減（均圧）されるとともに、パイロット弁体２７を閉弁方向に付勢する弁体付勢ばね（付勢部材）２４は、弁口１１ｂの開弁時に主弁体２５を付勢しないため、駆動トルクが小さくて済み、動作性、耐久性を向上できるとともに、電動弁１の更なる小型化を図ることができる。   As described above, in the motor-operated valve 1 of the present embodiment, the pilot valve body 27 and the main valve body 25 are moved in the same order with different lift amounts in accordance with the upward movement of the valve holder 23 by the elevation drive device. After the equalizing passage 26A is opened, the valve port 11b is opened with a time difference (in a stepwise manner) after the equalizing passage 26A is opened (in other words, the equalizing passages 26A and 26A are opened). Since the valve port 11b is opened stepwise in that order), the pressure equalizing passage 26A is opened before the valve port 11b is opened, and the pressure difference between the upper and lower sides of the main valve body 25 is reduced (equalizing pressure). At the same time, the valve element urging spring (urging member) 24 for urging the pilot valve element 27 in the valve closing direction does not urge the main valve element 25 when the valve port 11b is opened, so that the driving torque is small. Operability and durability can be improved. It is possible to achieve further miniaturization of.

なお、上記実施形態では、主弁体２５内に設けられた縦穴２６（均圧通路２６Ａ）の上端縁部に着座するパイロット弁体２７の弁体部材２８の下面（着座面）が平面で構成されているが、例えば、図６に示される如くに、均圧通路２６Ａに対するパイロット弁体２７の着座面２７Ａは逆円錐面を有するようにしてもよい。図６に示す例では、逆円錐面を有する逆円錐台面によって前記着座面２７Ａが構成されている。この場合、着座面（逆円錐面）２７Ａの傾斜角（制御角）θ等を調整することにより、図７に示される如くに、例えば上記実施形態と比べて、開弁直後の流量変化の勾配（立ち上がり）を小さくでき、低流量制御域（図４参照）の制御性を高めることができる。   In the above-described embodiment, the lower surface (seating surface) of the valve body member 28 of the pilot valve body 27 that is seated on the upper edge of the vertical hole 26 (equalizing passage 26A) provided in the main valve body 25 is configured as a plane. However, for example, as shown in FIG. 6, the seating surface 27A of the pilot valve body 27 with respect to the pressure equalizing passage 26A may have an inverted conical surface. In the example shown in FIG. 6, the seating surface 27A is formed by an inverted truncated cone having an inverted cone. In this case, by adjusting the inclination angle (control angle) θ or the like of the seating surface (inverted conical surface) 27A, as shown in FIG. (Rise) can be reduced, and the controllability of the low flow rate control region (see FIG. 4) can be improved.

１ 電動弁
６ 第１入出口（流入口）
７ 第２入出口（流出口）
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
１５ｉ 雌ねじ部
２０ 背圧室
２１ 弁軸
２１ｅ 雄ねじ部
２３ 弁ホルダ
２３ｂ 内鍔状掛止部
２３ｃ 内周段差部
２４ 弁体付勢ばね（付勢部材）
２５ 主弁体
２５ｄ 外鍔状係止部
２６ 縦穴
２６Ａ 均圧通路
２７ パイロット弁体
２７ｂ ばね受け部
２７ｃ 鍔状係止部
２８ 弁体部材
２９ ワッシャ
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 6 First inlet / outlet (inlet)
7 Second entrance / exit (outflow)
10 Valve Body 11 Valve Seat Member 11a Valve Seat 11b Valve Port 12 Valve Chamber 15 Guide Stem 15i Female Thread 20 Back Pressure Chamber 21 Valve Shaft 21e Male Thread 23 Valve Holder 23b Inner Collar Hook 23c Inner Peripheral Step 24 Valve Body Biasing spring (biasing member)
25 Main valve body 25d Outer flange-shaped locking portion 26 Vertical hole 26A Equalizing passage 27 Pilot valve body 27b Spring receiving portion 27c Collar-shaped locking portion 28 Valve body member 29 Washer 30 Rotor 35 Movable stopper 36 for valve closing direction Valve opening direction Movable stopper 45 Can 50 Stator 55 Fixed stopper 56 for valve closing direction Fixed stopper for valve opening direction

Claims (7)

弁室、流入口、及び流出口を有し、前記弁室と前記流出口との間に弁座付き弁口が設けられた弁本体と、
前記弁口を開閉するための主弁体と、
前記主弁体の背面に形成された背圧室と、
前記弁口と前記背圧室とを連通すべく前記主弁体内に設けられた均圧通路と、
前記均圧通路を開閉するためのパイロット弁体と、
前記パイロット弁体を閉弁方向に付勢する付勢部材と、
前記主弁体及び前記パイロット弁体を昇降方向に相対移動可能に保持する弁ホルダと、
前記弁ホルダを昇降方向に移動させるためのロータ及びステータを有する昇降駆動装置と、を備え、
前記弁ホルダは円筒状を有し、前記弁ホルダ内に、前記主弁体の上部、前記パイロット弁体、及び前記付勢部材が配在されるとともに、前記弁ホルダ内における前記主弁体の背面に前記背圧室が画成されており、
前記背圧室と前記弁室とが連通せしめられており、
前記昇降駆動装置による前記弁ホルダの上方向への移動に伴って、前記パイロット弁体及び前記主弁体がその順序で異なるリフト量で前記弁ホルダに係合せしめられ、これにより、前記均圧通路が開かれた後に、前記弁口が開くようにされていることを特徴とする電動弁。 A valve body having a valve chamber, an inlet, and an outlet, wherein a valve port with a valve seat is provided between the valve chamber and the outlet.
A main valve body for opening and closing the valve port,
A back pressure chamber formed on the back of the main valve body,
An equalizing passage provided in the main valve body to communicate the valve port with the back pressure chamber;
A pilot valve body for opening and closing the equalizing passage,
An urging member for urging the pilot valve body in a valve closing direction;
A valve holder for holding the main valve body and the pilot valve body so as to be relatively movable in the elevating direction,
A lifting drive having a rotor and a stator for moving the valve holder in the lifting direction,
The valve holder has a cylindrical shape, and an upper portion of the main valve body, the pilot valve body, and the biasing member are disposed in the valve holder, and the main valve body in the valve holder is provided. The back pressure chamber is defined on the back,
The back pressure chamber and the valve chamber are communicated with each other,
With the upward movement of the valve holder by the lifting / lowering drive device, the pilot valve element and the main valve element are engaged with the valve holder with different lift amounts in that order, whereby the pressure equalization is achieved. The motor-operated valve, wherein the valve port is opened after the passage is opened. 前記昇降駆動装置により前記弁ホルダが最下降位置から上方向に連続的に移動せしめられるとき、前記主弁体が前記弁口を閉じたまま、前記付勢部材の付勢力により前記パイロット弁体が前記弁ホルダに係合せしめられるとともに、前記弁ホルダと一緒に前記パイロット弁体が上方向に移動せしめられて前記均圧通路が開かれた後、さらに前記弁ホルダが上方向に移動せしめられると、前記主弁体が前記弁ホルダに係合せしめられ、前記弁ホルダと一緒に前記主弁体が上方向に移動せしめられて前記弁口が開くようにされていることを特徴とする請求項１に記載の電動弁。   When the valve holder is continuously moved upward from the lowest position by the lifting drive device, the pilot valve body is moved by the urging force of the urging member while the main valve body keeps the valve port closed. After being engaged with the valve holder, the pilot valve body is moved upward together with the valve holder to open the equalizing passage, and then the valve holder is further moved upward. The main valve element is engaged with the valve holder, and the main valve element is moved upward together with the valve holder to open the valve port. 2. The motor-operated valve according to 1. 前記弁ホルダの天井穴は、前記昇降駆動装置により昇降可能に配在された弁軸に連結されていることを特徴とする請求項１又は２に記載の電動弁。 Ceiling hole of the valve holder, the electric valve according to claim 1 or 2, characterized in that it is connected to the vertically movable distribution Zaisa the valve axis by the lifting drive unit. 前記弁ホルダと前記主弁体との間の回転摺動抵抗を低減すべく、前記弁ホルダと前記主弁体との間にワッシャが介装されていることを特徴とする請求項１から３のいずれか一項に記載の電動弁。 4. The washer is interposed between the valve holder and the main valve body in order to reduce rotational sliding resistance between the valve holder and the main valve body. 5. The motor-operated valve according to any one of the preceding claims. 前記付勢部材によって、前記主弁体が前記パイロット弁体を介して閉弁方向に付勢されることを特徴とする請求項１から４のいずれか一項に記載の電動弁。 By the biasing member, the electric valve according to claim 1, any one of 4, characterized in that the main valve body is urged in the closing direction via the pilot valve body. 前記均圧通路は、前記主弁体内に昇降方向に沿って設けられた縦穴からなることを特徴とする請求項１から５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 5 , wherein the equalizing passage includes a vertical hole provided in the main valve body along a vertical direction. 前記パイロット弁体の前記均圧通路に対する着座面は逆円錐面を有することを特徴とする請求項１から６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 6 , wherein a seating surface of the pilot valve body with respect to the equalizing passage has an inverted conical surface.
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