JP5911706B2

JP5911706B2 - Motorized valve

Info

Publication number: JP5911706B2
Application number: JP2011259208A
Authority: JP
Inventors: 原田　貴雄; 貴雄原田; 健資田渕
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2011-11-28
Filing date: 2011-11-28
Publication date: 2016-04-27
Anticipated expiration: 2031-11-28
Also published as: JP2013113361A

Description

本発明は、ヒートポンプ式冷暖房システム等に使用するのに好適な電動弁に係り、特に、流体が双方向（第１の方向とその逆の第２の方向）に流され、かつ、少なくとも一方向には大流量が流される流路に対応した電動弁に関する。 The present invention relates to a motor-operated valve suitable for use in a heat pump type air conditioning system or the like, and in particular, a fluid is flowed in both directions (a first direction and a second direction opposite thereto) and at least one direction. Relates to a motor-operated valve corresponding to a flow path through which a large flow rate flows.

この種の電動弁として、従来、例えば、弁室、該弁室に開口する横向きの第１入出口、前記弁室に開口する縦向きの弁口、及び該弁口に連なる第２入出口を有する弁本体と、前記弁口を開閉すべく前記弁室に昇降可能に配在された弁体と、該弁体を昇降させるための電動モータを有する昇降駆動手段と、前記弁体を開弁方向に付勢する開弁ばねと、を備えたものが考えられている。 Conventionally, as this type of electric valve, for example, a valve chamber, a lateral first inlet / outlet opening in the valve chamber, a vertical valve port opening in the valve chamber, and a second inlet / outlet connected to the valve port are provided. A valve body having a valve body disposed in the valve chamber so as to be able to be raised and lowered, an elevating drive means having an electric motor for raising and lowering the valve body, and opening the valve body A thing provided with the valve-opening spring biased in the direction is considered.

また、かかる電動弁において、前記弁口の口径と前記弁体の上方に画成される背圧室の室径とを略同一に設定するとともに、弁口ないし第２入出口と前記背圧室とを連通させるべく、前記弁体を上下に貫通するように均圧通路を設け、弁口ないし第２入出口の圧力を前記均圧通路を介して背圧室に導入することにより、閉弁状態において弁体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）とをバランス（差圧をキャンセル）させ、もって、より小さなばね荷重の開弁ばねを使用できるようにして、電動弁の小型化、大容量化、省電力化等を図ろうとしたものも考えられている（例えば特許文献１参照） In the motor-operated valve, the diameter of the valve opening and the diameter of the back pressure chamber defined above the valve body are set substantially the same, and the valve opening or the second inlet / outlet and the back pressure chamber are set. In order to communicate with the valve body, a pressure equalizing passage is provided so as to penetrate up and down the valve body, and the valve opening or the second inlet / outlet pressure is introduced into the back pressure chamber through the pressure equalizing passage, thereby closing the valve. In the state, the balance between the push-down force (force acting in the valve closing direction) acting on the valve body and the push-up force (force acting in the valve opening direction) is canceled (the differential pressure is canceled). It is also considered that the motorized valve can be used to reduce the size, increase the capacity, and save power (see, for example, Patent Document 1).

特開2000-320711号公報JP 2000-320711 A

しかしながら、前記特許文献１に所載の電動弁のように、弁口の口径と背圧室の室径とを略同一に設定するとともに、差圧をキャンセルすべく弁体を上下に貫通するように均圧通路を設けたものにおいては、流体が第１の方向（第１入出口→第２入出口）に流される場合は、開弁時において弁体を押し下げる力よりも弁体を押し上げる力が上回り、弁体には上方向荷重が発生し、流体が第２の方向（第２入出口→第１入出口）に流される場合は、開弁時に均圧通路を介して背圧室に大きな動圧が印加されるので、開弁時において弁体を押し上げる力よりも弁体を押し下げる力が上回り、弁体に下方向荷重が発生し、流体が第１の方向に流されるときと第２の方向に流されるときとでは、開弁時に弁体に作用する荷重の方向が変化する。この場合、下方向荷重は、弁体を閉弁方向に押し下げる力となるので、より小さなばね荷重の開弁ばねを使用できるようにするには、流体が第２の方向に流されるときにおいても、上方向荷重（開弁方向に働く力）が発生するようになすことが望まれる。 However, like the motor-operated valve described in Patent Document 1, the diameter of the valve port and the chamber diameter of the back pressure chamber are set to be substantially the same, and the valve body is vertically penetrated to cancel the differential pressure. When the fluid flows in the first direction (first inlet / outlet → second inlet / outlet), the force that pushes up the valve body rather than the force that pushes down the valve body when the valve is opened. When an upward load is generated on the valve body and fluid flows in the second direction (second inlet / outlet → first inlet / outlet), the valve is opened to the back pressure chamber via the pressure equalizing passage when the valve is opened. Since a large dynamic pressure is applied, the force that pushes down the valve body is greater than the force that pushes up the valve body when the valve is opened, a downward load is generated on the valve body, and the fluid flows in the first direction. When flowing in the direction of 2, the direction of the load acting on the valve body when the valve is opened changes. In this case, the downward load is a force that pushes down the valve body in the valve closing direction. Therefore, in order to be able to use the valve-opening spring with a smaller spring load, even when the fluid is flowed in the second direction, It is desirable that an upward load (a force acting in the valve opening direction) is generated.

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、流体が第１の方向のみならず第２の方向に流されるときにおいても、上方向荷重（開弁方向に働く力）が発生するようにし得、もって、より小さなばね荷重の開弁ばねを使用できるようにして、小型化、大容量化、省電力化等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. The object of the present invention is to apply an upward load (acting in the valve opening direction) when the fluid flows in the second direction as well as the first direction. It is an object of the present invention to provide a motor-operated valve that can be reduced in size, increased in capacity, saved in power, and so on by using a valve-opening spring having a smaller spring load. .

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、該弁室に開口する横向きの第１入出口、前記弁室に開口する縦向きの弁口、及び該弁口に連なる第２入出口を有する弁本体と、前記弁口を開閉すべく前記弁室に昇降可能に配在された弁体と、該弁体を昇降させ前記弁口を開閉して前記第１入出口からの流体の流れと前記第２入出口からの流体の流れを制御するための電動モータを有する昇降駆動手段と、前記弁体を開弁方向に付勢する開弁ばねと、を備え、前記弁口の口径と前記弁体の上方に画成される背圧室の室径とが略同一に設定され、前記弁体内に、前記弁口ないし第２入出口と前記背圧室とを連通させるべく直線状の均圧通路が設けられ、該均圧通路を下方に延長するように細径の均圧導管が下向きに突設され、該均圧導管は下端が閉じられるとともに、前記背圧室に前記弁口ないし第２入出口から実質的に静圧のみを導入するように前記第２入出口の流体の流れ方向と直交する側面に開口が形成されていることを特徴としている。 In order to achieve the above object, the motor-operated valve according to the present invention basically includes a valve chamber, a first lateral inlet / outlet opening in the valve chamber, a vertical valve port opening in the valve chamber, and A valve body having a second inlet / outlet connected to the valve port; a valve body disposed in the valve chamber so as to be movable up and down to open and close the valve port ; and raising and lowering the valve body to open and close the valve port. a lift driving means having an electric motor order to control the flow of fluid from the fluid of the flow and second inlet and outlet from the first inlet and outlet, the valve opening spring for urging the valve body in the opening direction And a diameter of the valve opening and a chamber diameter of a back pressure chamber defined above the valve body are set to be substantially the same, and the valve body or the second inlet / outlet and the valve body are formed in the valve body. A linear pressure equalizing passage is provided to communicate with the back pressure chamber, and a small-diameter pressure equalizing conduit projects downward so as to extend the pressure equalizing passage downward. The homogeneous conduit together with the lower end is closed, said valve port to the second side surface substantially perpendicular to the direction of fluid flow of the second inlet and outlet to introduce only the static pressure from the inlet and outlet to the back pressure chamber It is characterized in that an opening is formed .

本発明に係る電動弁では、流体が例えば第１の方向に流される場合は、従来のものと同様に、開弁時において弁体を押し下げる力よりも弁体を押し上げる力が上回り、弁体には上方向荷重が発生する。 In the motor-operated valve according to the present invention, when the fluid is flowed, for example, in the first direction, the force that pushes up the valve body is higher than the force that pushes down the valve body when the valve is opened, as in the conventional valve. Generates an upward load.

それに対し、流体が、第２の方向に流される場合は、開弁時において背圧室には弁口ないし第２入出口に開口する側面開口から取り込まれる静圧のみが印加され、動圧は印加されないので、この第２の方向流れ時においても、開弁時において弁体を押し下げる力よりも弁体を押し上げる力が上回り、弁体には、第１の方向流れ時よりも小さいが上方向荷重が発生する。 On the other hand, when the fluid flows in the second direction, only the static pressure taken from the side opening that opens to the valve port or the second inlet / outlet is applied to the back pressure chamber when the valve is opened, and the dynamic pressure is Even when the flow in the second direction is not applied, the force for pushing up the valve body exceeds the force for pushing down the valve body at the time of opening the valve, and the valve body has a smaller upward direction than the flow in the first direction. A load is generated.

このように、第１の流れ方向時だけでなく、第２の流れ方向時においても、弁体に上方向荷重が発生するようにされることにより、より小さなばね荷重の開弁ばねを使用できるようになり、その結果、小型化、大容量化、省電力化等を図ることができる。 Thus, not only in the first flow direction but also in the second flow direction, an upward load is generated on the valve body, so that a valve opening spring with a smaller spring load can be used. As a result, downsizing, large capacity, power saving, and the like can be achieved.

本発明に係る電動弁の第１実施例の閉弁状態を示し、（Ａ）は縦断面図、（Ｂ）は（Ａ）のＢ部の拡大詳細図。The valve closing state of 1st Example of the motor operated valve which concerns on this invention is shown, (A) is a longitudinal cross-sectional view, (B) is an enlarged detail drawing of the B section of (A). 図１に示される第１実施例の開弁状態を示す縦断面図。The longitudinal cross-sectional view which shows the valve opening state of 1st Example shown by FIG. 本発明に係る電動弁の参考例の閉弁状態を示す縦断面図。The longitudinal cross-sectional view which shows the valve closing state of the reference example of the motor operated valve which concerns on this invention.

以下、本発明の実施形態を図面を参照しながら説明する。
図１は、本発明に係る電動弁の第１実施例の閉弁状態を示し、（Ａ）は縦断面図、（Ｂ）は（Ａ）のＢ部の拡大詳細図、図２は、図１に示される第１実施例の電動弁の開弁状態を示す縦断面図である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a closed state of a motor-operated valve according to a first embodiment of the present invention, in which (A) is a longitudinal sectional view, (B) is an enlarged detailed view of part B of (A), and FIG. 1 is a longitudinal sectional view showing a valve open state of a motor operated valve according to a first embodiment shown in FIG.

図示の電動弁１は、例えばヒートポンプ式冷暖房システムにおいて膨張弁として使用するのに好適なもので、流体（冷媒）が双方向（第１の方向とその逆の第２の方向）に流され、かつ、少なくとも一方向には大流量が流される流路に対応した双方向流通型の電動弁である。 The illustrated motor-operated valve 1 is suitable for use as, for example, an expansion valve in a heat pump air-conditioning system, and a fluid (refrigerant) is flowed in both directions (the first direction and the opposite second direction), And it is a bidirectional | two-way flow-type motor-operated valve corresponding to the flow path through which a large flow volume flows at least in one direction.

図において、電動弁１は、板金製の筒状基体６を有する弁本体５と、この弁本体５内に昇降可能に配在された弁体２０と、この弁体２０を昇降させるべく、弁本体５の上側に取り付けられたステッピングモータ５０とを備える。 In the figure, a motor-operated valve 1 includes a valve body 5 having a cylindrical base 6 made of sheet metal, a valve body 20 disposed in the valve body 5 so as to be movable up and down, and a valve body 20 for raising and lowering the valve body 20. And a stepping motor 50 attached to the upper side of the main body 5.

弁本体５の筒状基体６には、弁室７が形成されるとともに、この弁室７に開口する横向きの第１入出口（導管継手）１１が取り付けられ、さらに、その底部には下側から弁室７に開口する縦向きの弁口９が形成された弁座部材８が固着され、この弁座部材８には、前記弁口９に連なる第２入出口（導管継手）１２が取り付けられている。 The tubular body 6 of the valve body 5 is formed with a valve chamber 7 and is fitted with a lateral first inlet / outlet (conduit joint) 11 that opens into the valve chamber 7. A valve seat member 8 formed with a vertical valve port 9 that opens to the valve chamber 7 is fixed, and a second inlet / outlet (conduit joint) 12 connected to the valve port 9 is attached to the valve seat member 8. It has been.

筒状基体６の上面開口部には、段付き筒状基台１３が取着され、この基台１３の上端部には、モータ５０の一部を構成するキャン５８の下端部が溶接等により接合されている。筒状基台１３の内周側には隔壁１４ｃ付き筒状保持部材１４が圧入等により固定され、この筒状保持部材１４の上部には、下部内周にめねじ１５ｉが設けられためねじ付き軸受部材１５がかしめ係止固定されている。筒状保持部材１４の隔壁１４ｃの直上は、圧縮コイルばねからなる開弁ばね２５が収納されるばね室１４ａとされている。 A stepped cylindrical base 13 is attached to the upper surface opening of the cylindrical base 6, and the lower end of a can 58 constituting a part of the motor 50 is welded to the upper end of the base 13. It is joined. A cylindrical holding member 14 with a partition wall 14c is fixed to the inner peripheral side of the cylindrical base 13 by press-fitting or the like, and the upper part of the cylindrical holding member 14 is provided with a female screw 15i on the lower inner periphery so that it is threaded. The bearing member 15 is fixed by caulking. Immediately above the partition wall 14c of the cylindrical holding member 14 is a spring chamber 14a in which a valve opening spring 25 made of a compression coil spring is accommodated.

また、前記弁体２０は、前記弁座部材８に接離して弁口９を開閉する逆円錐台状の弁体部２０ａと、中間小径部２０ｂと、大径上部２０ｃとを有し、大径上部２０ｃは、上記筒状保持部材１４における隔壁１４ｃより下側の弁体ガイド穴１４ｂに摺動自在に嵌挿されている。 The valve body 20 includes an inverted truncated cone-shaped valve body portion 20a that contacts and separates from the valve seat member 8 to open and close the valve port 9, an intermediate small-diameter portion 20b, and a large-diameter upper portion 20c. The upper diameter portion 20c is slidably fitted into the valve element guide hole 14b below the partition wall 14c in the cylindrical holding member 14.

一方、ステッピングモータ５０は、ヨーク５１、ボビン５２、コイル５３、樹脂モールドカバー５４等からなる、キャン５８に外嵌固定されたステータ５５と、キャン５８内に回転自在に配在され、ロータ支持部材５６がその上部内側に固着されたロータ５７とを有している。また、ロータ５７の内周側には、ロータ支持部材５６に一体的に設けられた太陽歯車４１、筒状保持部材１４に固着された筒状体の先端に固定された固定リング歯車４７、前記太陽歯車４１及び固定リング歯車４７に歯合する遊星歯車４２、該遊星歯車４２を回転自在に支持するキャリア４４、前記遊星歯車４２に歯合するリング状の出力歯車４５、該出力歯車４５に固着された出力軸４６等からなる不思議遊星歯車式減速機構４０が付設されている。前記固定リング歯車４７の歯数は、前記出力歯車４５の歯数とは異なるようにされている。 On the other hand, the stepping motor 50 is composed of a yoke 51, a bobbin 52, a coil 53, a resin mold cover 54, and the like. The stator 55 is externally fixed to the can 58, and is rotatably disposed in the can 58. 56 has a rotor 57 fixed to the inside of the upper portion thereof. Further, on the inner peripheral side of the rotor 57, a sun gear 41 provided integrally with the rotor support member 56, a fixed ring gear 47 fixed to the tip of a cylindrical body fixed to the cylindrical holding member 14, A planetary gear 42 that meshes with the sun gear 41 and the fixed ring gear 47, a carrier 44 that rotatably supports the planetary gear 42, a ring-shaped output gear 45 that meshes with the planetary gear 42, and an anchor to the output gear 45 A mysterious planetary gear type speed reduction mechanism 40 including the output shaft 46 and the like is provided. The number of teeth of the fixed ring gear 47 is different from the number of teeth of the output gear 45.

前記出力歯車４５には出力軸４６が固着されている。この出力軸４６の上部に設けられた穴に支持軸４９の下部が挿通されており、該支持軸４９に前記キャリア４４、太陽歯車４１（ロータ支持部材５６）が挿通されている。 An output shaft 46 is fixed to the output gear 45. A lower portion of the support shaft 49 is inserted through a hole provided in the upper portion of the output shaft 46, and the carrier 44 and the sun gear 41 (rotor support member 56) are inserted through the support shaft 49.

支持部材４８はキャン５８の内径とほぼ同一径を有しており、キャン５８内部において、該キャン５８の上部とロータ支持部材５６との配置されている。そして前記支持軸４９の上部は、前記支持部材４８の中心部に設けられた穴に挿通されている。 The support member 48 has substantially the same diameter as the inner diameter of the can 58, and the upper portion of the can 58 and the rotor support member 56 are arranged inside the can 58. The upper portion of the support shaft 49 is inserted into a hole provided in the center portion of the support member 48.

前記減速機構４０の出力軸４６は、前記めねじ付き軸受部材１５の上部に回転自在に嵌挿され、この出力軸４６の回転が、前記軸受部材１５に設けられためねじ１５ｉに螺合するおねじ１７ｅが設けられたおねじ付き回転昇降軸１７に伝達される。出力軸４６の下部にはスリット状嵌合部４６ａが設けられ、回転昇降軸１７には前記スリット状嵌合部４６ａに摺動自在に嵌合する板状部１７ａが突設されており、出力軸４６が回転すると、前記めねじ１５ｉとおねじ１７ｅによるねじ送りにより回転昇降軸１７が回転しながら昇降せしめられる。 The output shaft 46 of the speed reduction mechanism 40 is rotatably inserted in the upper part of the bearing member 15 with a female thread, and the rotation of the output shaft 46 is provided in the bearing member 15 and is screwed into the screw 15i. The screw 17e is transmitted to a rotary elevating shaft 17 with a male thread. A slit-like fitting portion 46a is provided at the lower portion of the output shaft 46, and a plate-like portion 17a that is slidably fitted to the slit-like fitting portion 46a is provided on the rotary elevating shaft 17 so as to project. When the shaft 46 rotates, the rotary elevating shaft 17 is raised and lowered while rotating by the screw feed by the female screw 15i and the male screw 17e.

回転昇降軸１７の下方には、該回転昇降軸１７の下方への推力がボール１８、ボール受座１９を介して伝達される段付き筒状の推力伝達部材２３が配在されている。なお、ボール１８を介在させていることにより、回転昇降軸１７が回転しながら下降しても、回転昇降軸１７から推力伝達部材２３へは下方への推力のみが伝達され、回転力は伝達されない。 A stepped cylindrical thrust transmission member 23 is disposed below the rotary elevating shaft 17 so as to transmit the thrust downward of the rotary elevating shaft 17 via the ball 18 and the ball seat 19. Since the ball 18 is interposed, only the downward thrust is transmitted from the rotary lift shaft 17 to the thrust transmission member 23 even if the rotary lift shaft 17 is lowered while rotating, and no rotational force is transmitted. .

推力伝達部材２３は、上から順に、内周に前記ボール受座１９が嵌め込まれた大径上部２３ａ、前記筒状保持部材１４の隔壁１４ｃに摺動自在に挿通せしめられた中間胴部２３ｂ、該中間胴部２３ｂより小径の小径下部２３ｃからなっており、その内部には、後述する均圧通路３２の上部を構成する貫通孔３２ｄ及び後述する背圧室３０に開口する複数個の横孔３２ｅが設けられている。なお、貫通孔３２ｄの上端開口はボール受座１９により閉塞されている。 The thrust transmission member 23 includes, in order from the top, a large-diameter upper portion 23a in which the ball seat 19 is fitted on the inner periphery, and an intermediate body portion 23b that is slidably inserted into the partition wall 14c of the cylindrical holding member 14. The intermediate body portion 23b is formed of a small-diameter lower portion 23c having a diameter smaller than that of the intermediate body portion 23b. 32e is provided. The upper end opening of the through hole 32d is closed by the ball seat 19.

推力伝達部材２３の小径下部２３ｃは、弁体２０の上部嵌合穴２０ｄに圧入等により嵌合固定されており、弁体２０と推力伝達部材２３は一体に昇降せしめられる。弁体２０の上端面と推力伝達部材２３の中間胴部２３ｂの下端段差部との間には、前記小径下部２３ｃ圧入時において押さえ部材２４が挟み込まれて固定されており、この押さえ部材２４と弁体２０の上端部に設けられた環状溝と前記弁体ガイド穴１４ｂとの間にはＯリング等のシール部材３８が装着されている。 The small diameter lower portion 23c of the thrust transmission member 23 is fitted and fixed to the upper fitting hole 20d of the valve body 20 by press fitting or the like, and the valve body 20 and the thrust transmission member 23 are moved up and down integrally. A pressing member 24 is sandwiched and fixed between the upper end surface of the valve body 20 and the lower end step portion of the intermediate body portion 23b of the thrust transmission member 23 when the small diameter lower portion 23c is press-fitted. A seal member 38 such as an O-ring is mounted between the annular groove provided at the upper end of the valve body 20 and the valve body guide hole 14b.

また、筒状保持部材１４の隔壁１４ｃより上側のばね室１４ａには、圧縮コイルばねからなる開弁ばね２５がその下端を隔壁１４ｃに当接させた状態で配在されるとともに、この開弁ばね２５の付勢力（引き上げ力）を推力伝達部材２３を介して弁体２０に伝達すべく、上下に鍔状引っ掛け部２８ａ、２８ｂを有する引き上げばね受け体２８が配在されている。引き上げばね受け体２８の上引っ掛け部２８ａは、開弁ばね２５の上に乗せられ、下引っ掛け部２８ｂは推力伝達部材２３の大径上部２３ａの下端段差部を掛止するようになっている。 A valve opening spring 25 made of a compression coil spring is disposed in the spring chamber 14a above the partition wall 14c of the cylindrical holding member 14 with its lower end in contact with the partition wall 14c. In order to transmit the urging force (lifting force) of the spring 25 to the valve body 20 via the thrust transmission member 23, a lifting spring receiving body 28 having hook-like hook portions 28a and 28b on the upper and lower sides is arranged. The upper hooking portion 28 a of the pulling spring receiving body 28 is placed on the valve opening spring 25, and the lower hooking portion 28 b is configured to hook the lower end step portion of the large-diameter upper portion 23 a of the thrust transmission member 23.

したがって、モータ５０（ロータ５７）が一方向に回転せしめられるときには、前記めねじ１５ｉとおねじ１７ｅによるねじ送りにより回転昇降軸１７が回転しながら例えば下降せしめられ、回転昇降軸１７の推力により、推力伝達部材２３及び弁体２０が開弁ばね２５の付勢力に抗して押し下げられ、最終的には弁体２０の弁体部２０ａが弁座締切部８ａに着座して弁口９が閉じられる。それに対し、モータ５０（ロータ５７）が他方向に回転せしめられるときには、前記めねじ１５ｉとおねじ１７ｅによるねじ送りにより回転昇降軸１７が回転しながら例えば上昇せしめられ、それに伴い推力伝達部材２３及び弁体２０が開弁ばね２５の付勢力によって引き上げられて、弁体部２０ａが弁座締切部８ａからリフトして弁口９を開く。 Therefore, when the motor 50 (rotor 57) is rotated in one direction, the rotary elevating shaft 17 is lowered, for example, while being rotated by the screw feed by the female screw 15i and the external screw 17e. The transmission member 23 and the valve body 20 are pushed down against the urging force of the valve opening spring 25. Finally, the valve body portion 20a of the valve body 20 is seated on the valve seat shut-off portion 8a and the valve port 9 is closed. . On the other hand, when the motor 50 (rotor 57) is rotated in the other direction, for example, the rotary elevating shaft 17 is raised while being rotated by screw feed by the female screw 15i and the male screw 17e, and accordingly, the thrust transmission member 23 and the valve The body 20 is pulled up by the urging force of the valve opening spring 25, and the valve body portion 20a is lifted from the valve seat shut-off portion 8a to open the valve port 9.

前記弁体２０の上方で押さえ部材２４と筒状保持部材１４の隔壁１４ｃとの間には、背圧室３０が画成されている。ここでは、閉弁状態において弁体に作用する押し下げ力（閉弁方向に働く力）と弁体に作用する押し上げ力（開弁方向に働く力）とをバランス（差圧をキャンセル）させるべく、背圧室３０の室径と弁口９の口径とは略同一に設定されている。また、第２入出口１２と背圧室３０とを連通させるべく、弁体２０内に均圧通路３２の一部を構成する貫通孔３２ｃが設けられている。 A back pressure chamber 30 is defined between the pressing member 24 and the partition wall 14 c of the cylindrical holding member 14 above the valve body 20. Here, in order to balance (cancel the differential pressure) the push-down force (force acting in the valve-closing direction) acting on the valve body in the valve-closed state and the push-up force (force acting in the valve-opening direction) acting on the valve body, The diameter of the back pressure chamber 30 and the diameter of the valve port 9 are set to be substantially the same. In addition, a through hole 32 c constituting a part of the pressure equalizing passage 32 is provided in the valve body 20 in order to allow the second inlet / outlet 12 and the back pressure chamber 30 to communicate with each other.

また、前記弁体２０の弁体部２０ａには、前記均圧通路３２の一部（最下部）を構成する細径の均圧導管２２の直管部２２ａ上部が圧入等により固定されている。均圧導管２２は、弁体部２０ａの最下面２０ｅより下方に突出せしめられており、その直管部２２ａの下端面開口が逆円錐状栓部材２２ｂで閉じられるとともに、直管部２２ａの下端周壁部に複数個の側面開口３２ａ、３２ａが形成されて側方のみが開口せしめられている。 Further, an upper portion of the straight pipe portion 22a of the small-diameter pressure equalizing conduit 22 constituting a part (lowermost portion) of the pressure equalizing passage 32 is fixed to the valve body portion 20a of the valve body 20 by press fitting or the like. . The pressure equalizing conduit 22 is projected downward from the lowermost surface 20e of the valve body 20a, and the lower end surface opening of the straight pipe portion 22a is closed by the inverted conical plug member 22b, and the lower end of the straight pipe portion 22a. A plurality of side openings 32a and 32a are formed in the peripheral wall portion, and only the sides are opened.

したがって、本実施例では、第２入出口１２と背圧室３０とを連通させる均圧通路３２は、下から順に、均圧導管２２の下端周壁に設けられた側面開口３２ａ、３２ａ、均圧導管２２の内部通路３２ｂ、弁体２０内部の貫通孔３２ｃ（弁体２０の上部嵌合穴２０ｄの下部を含む）、推力伝達部材２３内の貫通孔３２ｄ、及び背圧室３０に開口する複数個の横孔３２ｅで構成される。 Therefore, in the present embodiment, the pressure equalizing passage 32 for communicating the second inlet / outlet 12 and the back pressure chamber 30 is, in order from the bottom, side openings 32a and 32a provided in the lower peripheral wall of the pressure equalizing conduit 22, The internal passage 32b of the conduit 22, the through hole 32c inside the valve body 20 (including the lower part of the upper fitting hole 20d of the valve body 20), the through hole 32d in the thrust transmission member 23, and a plurality of openings that open to the back pressure chamber 30. It consists of a number of horizontal holes 32e.

上記のように第１実施例の電動弁１では、閉弁状態において弁体２０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）とをバランス（差圧をキャンセル）させるべく、背圧室３０の室径と弁口９の口径とが略同一に設定されるとともに、弁体２０内に第２入出口１２と背圧室３０とを連通させるべく直線状の均圧通路３２（３２ｃ）が設けられるとともに、該均圧通路３２を下方に延長するように細径の均圧導管２２が下向きに突設され、該均圧導管２２（直管部２２ａ）の下端開口が閉じられて側方のみが開口せしめられているので、開弁時において背圧室３０には側面開口３２ａ、３２ａから取り込まれる静圧のみが印加され、動圧は印加されない。すなわち開弁時には、弁の先端には全圧（静圧と動圧）が加わるが、背圧室内には静圧のみが加わることになるため、次のような作用効果が得られる。 As described above, in the motor-operated valve 1 according to the first embodiment, the balance between the push-down force (force acting in the valve closing direction) acting on the valve body 20 and the push-up force (force acting in the valve opening direction) in the valve-closed state is the difference (difference). In order to cancel the pressure), the diameter of the back pressure chamber 30 and the diameter of the valve port 9 are set to be substantially the same, and the second inlet / outlet 12 and the back pressure chamber 30 are communicated with each other in the valve body 20. A straight pressure equalizing passage 32 (32c) is provided, and a small-diameter pressure equalizing conduit 22 projects downward so as to extend the pressure equalizing passage 32 downward, and the pressure equalizing conduit 22 (straight pipe portion) is provided. Since the lower end opening of 22a) is closed and only the side is opened, only the static pressure taken in from the side openings 32a and 32a is applied to the back pressure chamber 30 when the valve is opened, and no dynamic pressure is applied. . That is, when the valve is opened, total pressure (static pressure and dynamic pressure) is applied to the tip of the valve, but only the static pressure is applied to the back pressure chamber, so that the following effects can be obtained.

流体（冷媒）が図の実線矢印で示される如くに第１の方向（第１入出口１１→第２入出口１２）に流される場合は、従来のものと同様に、開弁時において弁体２０を押し下げる力よりも弁体２０を押し上げる力が上回り、弁体２０には上方向荷重が発生する。 When the fluid (refrigerant) flows in the first direction (first inlet / outlet 11 → second inlet / outlet 12) as shown by the solid line arrows in the figure, the valve body is opened when the valve is opened, as in the conventional case. The force that pushes up the valve body 20 exceeds the force that pushes down the valve body 20, and an upward load is generated in the valve body 20.

それに対し、流体（冷媒）が図の破線矢印で示される如くに、第２の方向（第２入出口１２→第１入出口１１）に流される場合は、開弁時において背圧室３０には側面開口３２ａ、３２ａから取り込まれる静圧のみが印加され、動圧は印加されないので、この第２の方向流れ時においても、開弁時において弁体２０を押し下げる力よりも弁体２０を押し上げる力が上回り、弁体２０には、第１の方向流れ時よりも小さいが上方向荷重が発生する。 On the other hand, when the fluid (refrigerant) flows in the second direction (second inlet / outlet 12 → first inlet / outlet 11) as indicated by the broken line arrows in the figure, the back pressure chamber 30 is opened when the valve is opened. Since only the static pressure taken in from the side openings 32a and 32a is applied, and no dynamic pressure is applied, the valve body 20 is pushed up more than the force that pushes down the valve body 20 when the valve is opened even in the flow in the second direction. The force is increased, and an upward load is generated in the valve body 20 although it is smaller than that in the flow in the first direction.

このように、第１の流れ方向時だけでなく、第２の流れ方向時においても、弁体に上方向荷重が発生するようにされることにより、より小さなばね荷重の開弁ばね２５を使用できるようになり、その結果、小型化、大容量化、省電力化等を図ることができる。 Thus, not only in the first flow direction but also in the second flow direction, an upward load is generated on the valve body, so that the valve-opening spring 25 with a smaller spring load is used. As a result, it is possible to reduce the size, increase the capacity, and save power.

図３は、本発明に係る電動弁の参考例の閉弁状態を示す。この参考例の電動弁２においては、第１実施例の電動弁１の各部に対応する部分には共通の符号を付してそれらの重複説明を省略し、相違点を重点的に説明する。 FIG. 3 shows a closed state of a reference example of the electric valve according to the present invention. In the motor-operated valve 2 of the reference example, portions corresponding to the respective portions of the motor-operated valve 1 of the first embodiment are denoted by common reference numerals, and redundant description thereof is omitted, and differences will be mainly described.

この参考例の電動弁２では、弁体２０に第１実施例のような均圧通路３２が設けられておらず、弁体２０及び弁室７（弁本体５）外に均圧通路３３が設けられている。この均圧通路３３は、第２入出口１２の周壁部分に横向きに開口する横孔３３ａと、大部分が外部に配在され、その上辺部が筒状基体６を挿通せしめられて筒状保持部材１４の隔壁１４ｃより下側に挿入固定された例えばコ字状の導管３４の内部通路３３ｃと、この内部通路３３ｃ及び背圧室３０に連なる、筒状保持部材１４の隔壁１４ｃより下側に設けられた横孔３３ｂとからなっている。 In the motor-operated valve 2 of this reference example, the pressure equalizing passage 32 as in the first embodiment is not provided in the valve body 20, and the pressure equalizing passage 33 is provided outside the valve body 20 and the valve chamber 7 (valve body 5). Is provided. The pressure equalizing passage 33 has a horizontal hole 33a that opens laterally in the peripheral wall portion of the second inlet / outlet 12 and most of the pressure equalizing passage 33 is arranged outside, and an upper side portion of the pressure equalizing passage 33 is inserted into the cylindrical base 6 and is held in a cylindrical shape. An internal passage 33c of, for example, a U-shaped conduit 34, which is inserted and fixed below the partition wall 14c of the member 14, and a lower side than the partition wall 14c of the cylindrical holding member 14 connected to the internal passage 33c and the back pressure chamber 30. It consists of a provided lateral hole 33b.

かかる均圧通路３３が設けられていることにより、背圧室３０には静圧しか印加されないので、本参考例の電動弁２においても、第１実施例のものと同様に、第１の流れ方向時だけでなく、第２の流れ方向時においても、弁体２０に上方向荷重が発生するようにされ、そのため、より小さなばね荷重の開弁ばね２５を使用できるようになり、その結果、小型化、大容量化、省電力化等を図ることができる。 Since only the static pressure is applied to the back pressure chamber 30 by providing the pressure equalizing passage 33, the motor-driven valve 2 of the present reference example also has the first flow as in the first embodiment. Not only in the direction but also in the second flow direction, an upward load is generated on the valve body 20, so that the valve-opening spring 25 with a smaller spring load can be used. Miniaturization, large capacity, power saving, and the like can be achieved.

なお、前記均圧通路３３は特にコ字状である必要はなく、第２入出口１２あるいは弁口９の側面と背圧室３０とが連通すれば良い。 The pressure equalizing passage 33 is not particularly required to be U-shaped, and it is sufficient that the side surface of the second inlet / outlet 12 or the valve port 9 and the back pressure chamber 30 communicate with each other.

また、前述の説明においては、モータと弁体との間には遊星歯車機構が配置されるものとしたが、該機構を配置することなく、モータの出力をねじ機構を介して弁軸に直接伝達させるようにしても良い。 In the above description, the planetary gear mechanism is arranged between the motor and the valve body. However, without arranging the mechanism, the output of the motor is directly applied to the valve shaft via the screw mechanism. You may make it transmit.

さらに、弁体を駆動するアクチュエータはステッピングモータであるものとしたが、他の形態のモータでも良いことは当然である。 Furthermore, although the actuator for driving the valve body is a stepping motor, it is a matter of course that other types of motors may be used.

さらにまた、本発明の電動弁は、ヒートポンプ式冷暖房システムに適用されるだけではなく、他のシステムにも適用できることは言うまでもない。 Furthermore, it goes without saying that the motor-operated valve of the present invention can be applied not only to a heat pump air conditioning system but also to other systems.

１、２電動弁
５弁本体
７弁室
８弁座部材
９弁口
１１第１入出口
１２第２入出口
２０弁体
２０ａ弁体部
２５開弁ばね
２８引き上げばね受け体
３０背圧室
３２均圧通路
３２ａ側面開口
３３均圧通路
３４導管
３３ａ横孔
５０ステッピングモータ
５５ステータ
５７ロータ 1, 2 Motorized valve 5 Valve body 7 Valve chamber 8 Valve seat member 9 Valve port 11 First inlet / outlet 12 Second inlet / outlet 20 Valve body 20a Valve body portion 25 Opening spring 28 Lifting spring receiving body 30 Back pressure chamber 32 Average Pressure passage 32a Side opening 33 Pressure equalization passage 34 Conduit 33a Side hole 50 Stepping motor 55 Stator 57 Rotor

Claims

弁室、該弁室に開口する横向きの第１入出口、前記弁室に開口する縦向きの弁口、及び該弁口に連なる第２入出口を有する弁本体と、前記弁口を開閉すべく前記弁室に昇降可能に配在された弁体と、該弁体を昇降させ前記弁口を開閉して前記第１入出口からの流体の流れと前記第２入出口からの流体の流れを制御するための電動モータを有する昇降駆動手段と、前記弁体を開弁方向に付勢する開弁ばねと、を備え、前記弁口の口径と前記弁体の上方に画成される背圧室の室径とが略同一に設定されている電動弁であって、
前記弁体内に、前記弁口ないし第２入出口と前記背圧室とを連通させるべく直線状の均圧通路が設けられ、該均圧通路を下方に延長するように細径の均圧導管が下向きに突設され、該均圧導管は下端が閉じられるとともに、前記背圧室に前記弁口ないし第２入出口から実質的に静圧のみを導入するように前記第２入出口の流体の流れ方向と直交する側面に開口が形成されていることを特徴とする電動弁。 A valve body having a valve chamber, a lateral first inlet / outlet opening in the valve chamber, a vertical valve port opening in the valve chamber, and a second inlet / outlet connected to the valve port; and opening and closing the valve port Therefore, the valve body arranged to be movable up and down in the valve chamber, the flow of fluid from the first inlet and outlet and the flow of fluid from the second inlet and outlet by opening and closing the valve body and opening and closing the valve port a lift driving means having an electric motor order to control, and a valve opening spring for urging the valve body in the opening direction, is defined above the valve body and the diameter of the valve port An electric valve in which the chamber diameter of the back pressure chamber is set to be substantially the same,
A straight pressure equalizing passage is provided in the valve body so as to communicate the valve port or the second inlet / outlet and the back pressure chamber, and the pressure equalizing conduit having a small diameter is provided so as to extend the pressure equalizing passage downward. Projecting downward, the pressure equalizing conduit is closed at the lower end, and the fluid at the second inlet / outlet is adapted to introduce only static pressure into the back pressure chamber from the valve port or the second inlet / outlet. A motor-operated valve characterized in that an opening is formed on a side surface orthogonal to the flow direction of .