JP6889685B2 - Electric valve and refrigeration cycle system - Google Patents

Electric valve and refrigeration cycle system Download PDF

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JP6889685B2
JP6889685B2 JP2018116926A JP2018116926A JP6889685B2 JP 6889685 B2 JP6889685 B2 JP 6889685B2 JP 2018116926 A JP2018116926 A JP 2018116926A JP 2018116926 A JP2018116926 A JP 2018116926A JP 6889685 B2 JP6889685 B2 JP 6889685B2
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valve
holder
operating shaft
electric
rotary bearing
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JP2019219007A (en
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剛 竹田
剛 竹田
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Saginomiya Seisakusho Inc
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Saginomiya Seisakusho Inc
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Priority to JP2018116926A priority Critical patent/JP6889685B2/en
Priority to CN202111564811.0A priority patent/CN114233879A/en
Priority to CN201910476516.6A priority patent/CN110617337B/en
Priority to CN202111564601.1A priority patent/CN114233878B/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
    • 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
    • F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
    • 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

Description

本発明は、電動弁及び冷凍サイクルシステムに関する。 The present invention relates to an electric valve and a refrigeration cycle system.

従来、冷凍サイクルシステム等に使用される電動弁、特に圧力バランス型の電動弁は、弁部材に加わる差圧力をキャンセルするために、弁部材の上部の背圧室を、弁部材に設けた均圧路により弁部材下部の弁ポート側に導通し、弁部材の上部と下部を同圧にさせることで、弁部材に加わる正味の差圧力をキャンセルさせるという設計思想である。このような電動弁として、例えば、特許第３６７２３８０号公報（特許文献１）及び特開２０１７−２０３５０９号公報（特許文献２）に開示されたものがある。 Conventionally, electric valves used in refrigeration cycle systems and the like, especially pressure-balanced electric valves, have a back pressure chamber at the top of the valve member provided on the valve member in order to cancel the differential pressure applied to the valve member. The design concept is to cancel the net differential pressure applied to the valve member by conducting the pressure path to the valve port side of the lower part of the valve member and making the upper and lower parts of the valve member have the same pressure. As such an electric valve, for example, there are those disclosed in Japanese Patent No. 3672380 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2017-203509 (Patent Document 2).

この従来の電動弁は、電動モータのロータとのネジ送り機構により上下する連結棒により弁部材を駆動している。一方、圧力バランス型の電動弁では、弁部材をガイドするガイド面の部分でシール部により弁部材に対する背圧室を弁室等から封止する必要がある。このため、弁部材には常時シール部による摺動抵抗が生じ、作動時においても弁部材は回転しない構造となる。そこで、ベアリング等の回転軸受により弁部材を保持するようにしている。 In this conventional electric valve, the valve member is driven by a connecting rod that moves up and down by a screw feed mechanism with the rotor of the electric motor. On the other hand, in the pressure balance type electric valve, it is necessary to seal the back pressure chamber with respect to the valve member from the valve chamber or the like by a seal portion at the portion of the guide surface that guides the valve member. For this reason, the valve member always has a sliding resistance due to the seal portion, and the valve member does not rotate even during operation. Therefore, the valve member is held by a rotary bearing such as a bearing.

特許第３６７２３８０号公報Japanese Patent No. 3672380 特開２０１７−２０３５０９号公報JP-A-2017-203509

前記従来の電動弁では、回転軸受としてベアリングを使用することで、軸受け部分のトルクロスが減り作動性が良くなる。しかし、特許文献１のものにおいては弁ポート側からベアリングを流路としてケース内の背圧室側へと流体を流す構造となっている。このため、流体中の異物やスラッジ等がベアリングの内部に侵入する可能性がある。ベアリング内に異物が侵入した場合、回転時の摺動ロスが生じ、電動弁の作動性に影響を及ぼす可能性がある。また、特許文献２のものにおいては、弁軸（連結棒）に均圧流路を設けているが、流路上にベアリングが直接配置されており、特に弁ポート側（下側）の継手管から弁室側（横側）の継手管へと流体を流す場合に、異物が侵入する可能性がある。 In the conventional electric valve, by using a bearing as a rotary bearing, the torque cross of the bearing portion is reduced and the operability is improved. However, Patent Document 1 has a structure in which a fluid flows from the valve port side to the back pressure chamber side in the case using the bearing as a flow path. Therefore, foreign matter or sludge in the fluid may enter the inside of the bearing. If foreign matter enters the bearing, sliding loss during rotation may occur, which may affect the operability of the electric valve. Further, in Patent Document 2, a pressure equalizing flow path is provided on the valve shaft (connecting rod), but the bearing is directly arranged on the flow path, and the valve is particularly connected from the joint pipe on the valve port side (lower side). Foreign matter may enter when flowing fluid through the joint pipe on the chamber side (horizontal side).

本発明は、回転軸受を介して弁部材を保持するようにした圧力バランス型の電動弁において、流体内の異物等が回転軸受に侵入するのを防止して、高作動性を確保することを課題とする。 According to the present invention, in a pressure-balanced electric valve in which a valve member is held via a rotary bearing, foreign matter in a fluid is prevented from entering the rotary bearing to ensure high operability. Make it an issue.

請求項１の電動弁は、弁ハウジングの弁室内で作動軸に連動する弁部材により弁ポートを開閉する電動弁であって、前記作動軸に連結される回転軸受を有するとともに該回転軸受とは反対側に前記弁部材を保持する弁ホルダ部と、前記弁ホルダ部をガイドするホルダガイド部と、を備え、前記弁ホルダ部が、前記ホルダガイド部のガイド孔内に内挿されるとともに前記回転軸受を内包する円筒状のカバー部材を備え、前記作動軸には雄ねじ部が形成され、該雄ねじ部は、前記ガイド孔と同軸のねじ孔が形成されたネジホルダ部の雌ねじ部に螺合され、前記雄ねじ部と前記雌ねじ部とで前記作動軸を軸線方向に移動させるネジ送り機構が構成され、前記回転軸受は、前記作動軸の弁ポート側に設けられたフランジ部の弁ポート側に接続され、該作動軸に嵌合する内輪と、該内輪を周方向に囲む外輪と、前記内輪と前記外輪との間に介在する複数のボールと、を備え、前記弁部材と、前記回転軸受の前記外輪との間に付勢ばねが介装されていることを特徴とする。 The electric valve according to claim 1 is an electric valve that opens and closes a valve port by a valve member interlocking with an operating shaft in the valve chamber of the valve housing, has a rotary bearing connected to the operating shaft, and is the rotary bearing. A valve holder portion for holding the valve member and a holder guide portion for guiding the valve holder portion are provided on the opposite side, and the valve holder portion is inserted into the guide hole of the holder guide portion and rotates. A cylindrical cover member including a bearing is provided , a male screw portion is formed on the operating shaft, and the male screw portion is screwed into a female screw portion of a screw holder portion having a screw hole coaxial with the guide hole. The male screw portion and the female screw portion form a screw feed mechanism for moving the operating shaft in the axial direction, and the rotary bearing is connected to the valve port side of the flange portion provided on the valve port side of the operating shaft. The valve member and the rotary bearing are provided with an inner ring fitted to the operating shaft, an outer ring surrounding the inner ring in the circumferential direction, and a plurality of balls interposed between the inner ring and the outer ring. It is characterized in that an urging spring is interposed between the outer ring and the outer ring.

請求項２の電動弁は、請求項１に記載の電動弁であって、前記弁部材に対する背圧室の流体圧力と前記弁ポートの流体圧力とが均一にされる圧力バランス型であることを特徴とする。 The electric valve according to claim 2 is the electric valve according to claim 1, and is a pressure-balanced type in which the fluid pressure in the back pressure chamber with respect to the valve member and the fluid pressure in the valve port are made uniform. It is a feature.

請求項３の電動弁は、弁ハウジングの弁室内で作動軸に連動する弁部材により弁ポートを開閉する電動弁であって、前記作動軸に連結される回転軸受を有するとともに該回転軸受とは反対側に前記弁部材を保持する弁ホルダ部と、前記弁ホルダ部をガイドするホルダガイド部と、を備え、前記弁ホルダ部が、前記ホルダガイド部のガイド孔内に内挿されるとともに前記回転軸受を内包する円筒状のカバー部材を備え、前記弁部材に対する背圧室の流体圧力と前記弁ポートの流体圧力とが均一にされる圧力バランス型であり、電動モータのロータが密閉ケース内に収容されて該密閉ケースが前記弁ハウジングに気密に組み付けられ、前記ロータの回転によりネジ送り機構を介して前記作動軸を軸線方向に移動させるよう構成されるとともに、前記弁部材が内挿されて前記弁室内に配設された弁ガイド部と、前記弁ガイド部と前記弁部材との間で前記弁室と前記背圧室とを封止するシール部と、を備え、前記弁ホルダ部が、前記シール部によって前記弁室から封止された前記背圧室内で前記ホルダガイド部によってガイドされるよう構成されるとともに、前記ホルダガイド部の外周に、前記背圧室から前記密閉ケースへ流体を流す流路が設けられていることを特徴とする。 The electric valve according to claim 3 is an electric valve that opens and closes a valve port by a valve member interlocking with an operating shaft in the valve chamber of the valve housing, has a rotary bearing connected to the operating shaft, and is the rotary bearing. A valve holder portion for holding the valve member and a holder guide portion for guiding the valve holder portion are provided on the opposite side, and the valve holder portion is inserted into the guide hole of the holder guide portion and rotates. It is a pressure-balanced type that has a cylindrical cover member that includes a bearing, and the fluid pressure of the back pressure chamber with respect to the valve member and the fluid pressure of the valve port are made uniform. The sealed case is housed and airtightly assembled to the valve housing, and is configured to move the operating shaft in the axial direction via a screw feed mechanism by the rotation of the rotor, and the valve member is inserted. The valve holder portion includes a valve guide portion disposed in the valve chamber and a seal portion that seals the valve chamber and the back pressure chamber between the valve guide portion and the valve member. , while being configured to be guided by the holder guide portion in the back pressure chamber which is sealed from the valve chamber by the seal portion, the outer periphery of the holder guide portion, fluid from the back pressure chamber into the sealed casing It is characterized in that a flow path for flowing the water is provided.

請求項４の電動弁は、請求項３に記載の電動弁であって、前記ホルダガイド部が、前記作動軸と共に前記ネジ送り機構を構成していることを特徴とする。 The electric valve according to claim 4 is the electric valve according to claim 3, wherein the holder guide portion constitutes the screw feed mechanism together with the operating shaft.

請求項５の冷凍サイクルシステムは、圧縮機と、凝縮器と、膨張弁と、蒸発器と、を含む冷凍サイクルシステムであって、請求項１〜４のいずれか一項に記載の電動弁が、前記膨張弁として用いられていることを特徴とする。 The refrigeration cycle system according to claim 5 is a refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, and the electric valve according to any one of claims 1 to 4 is used. , It is characterized in that it is used as the expansion valve.

請求項１〜４の電動弁によれば、弁ホルダ部のカバー部材が、ホルダガイド部のガイド孔内に内挿されるとともに回転軸受を内包しているので、弁部材に対する背圧室へ流入する流体が回転軸受へ流れるのをカバー部材により阻止することができ、流体内の異物等が回転軸受に侵入するのを防止でき、高作動性を確保することができる。 According to the electric valves of claims 1 to 4, since the cover member of the valve holder portion is inserted into the guide hole of the holder guide portion and also includes the rotary bearing, it flows into the back pressure chamber for the valve member. The cover member can prevent the fluid from flowing to the rotary bearing, prevent foreign matter in the fluid from entering the rotary bearing, and ensure high operability.

請求項５の冷凍サイクルシステムによれば、請求項１〜４と同様な効果が得られる。 According to the refrigeration cycle system of claim 5, the same effect as that of claims 1 to 4 can be obtained.

本発明の実施形態の電動弁の縦断面図である。It is a vertical sectional view of the electric valve of the embodiment of this invention. 実施形態の電動弁の要部拡大図及び流体の流れの一例を示す図である。It is an enlarged view of the main part of the electric valve of an embodiment, and is the figure which shows an example of a fluid flow. 図１のＡ−Ａ拡大断面図である。FIG. 1 is an enlarged cross-sectional view taken along the line AA of FIG. 実施形態の冷凍サイクルシステムを示す図である。It is a figure which shows the refrigeration cycle system of an embodiment.

次に、本発明の電動弁及び冷凍サイクルシステムの実施形態を図面を参照して説明する。図１は実施形態の電動弁の縦断面図、図２は実施形態の電動弁の要部拡大図及び流体の流れの一例を示す図、図３は図１のＡ−Ａ拡大断面図である。なお、以下の説明における「上下」の概念は図１及び図２の図面における上下に対応する。 Next, an embodiment of the electric valve and the refrigeration cycle system of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view of the electric valve of the embodiment, FIG. 2 is an enlarged view of a main part of the electric valve of the embodiment and an example of a fluid flow, and FIG. 3 is an enlarged sectional view taken along the line AA of FIG. .. The concept of "upper and lower" in the following description corresponds to upper and lower in the drawings of FIGS. 1 and 2.

この電動弁１００は、弁ハウジング１と、弁部材２と、弁ホルダ部３と、「ホルダガイド部」としての支持部材４と、「電動モータ」としてのステッピングモータ５と、密閉ケース６と、弁ガイド部７と、を備えている。 The electric valve 100 includes a valve housing 1, a valve member 2, a valve holder portion 3, a support member 4 as a "holder guide portion", a stepping motor 5 as an "electric motor", and a sealed case 6. It includes a valve guide portion 7.

弁ハウジング１は例えば、黄銅、ステンレス等の金属により略円筒形状に形成されており、その内側に弁室１Ａを有している。また、弁ハウジング１には、側面から弁室１Ａに連通する継手管１１が取り付けられるとともに、下端部に弁座部材１３が取り付けられている。弁座部材１３の中央には円形の弁ポート１３ａが形成されるとともに、弁ポート１３ａの開口周囲にすり鉢状のテーパ面１３ｂが形成され、弁閉時に弁部材２の先端に形成されたテーパ状の流量制御部２１ａと弁ポート１３ａの開口上端とが当接する。また、弁座部材１３には弁ポート１３ａに連通するように弁室１Ａの軸線Ｘ方向に継手管１２が取り付けられている。 The valve housing 1 is formed of, for example, a metal such as brass or stainless steel in a substantially cylindrical shape, and has a valve chamber 1A inside the valve housing 1. Further, a joint pipe 11 communicating with the valve chamber 1A from the side surface is attached to the valve housing 1, and a valve seat member 13 is attached to the lower end portion. A circular valve port 13a is formed in the center of the valve seat member 13, and a mortar-shaped tapered surface 13b is formed around the opening of the valve port 13a. The flow rate control unit 21a and the upper end of the opening of the valve port 13a come into contact with each other. Further, a joint pipe 12 is attached to the valve seat member 13 in the axis X direction of the valve chamber 1A so as to communicate with the valve port 13a.

弁部材２は、全体としてピストン状の略円筒形状に形成されており、この弁部材２は、内空間２１Ａを有する中空円筒形状の弁体部２１と、弁体部２１から弁ホルダ部３側に突出するボス部２２と、ボス部２２より径の小さな連結部２３とを有している。弁体部２１の上天部とボス部２２との中央には、内空間２１Ａから上方に延びる縦均圧路２ａが形成され、ボス部２２にはこの縦均圧路２ａに連なってボス部２２の外周に開口する横均圧路２ｂとが形成されている。 The valve member 2 is formed in a substantially cylindrical shape like a piston as a whole, and the valve member 2 has a hollow cylindrical valve body portion 21 having an inner space 21A and a valve body portion 21 to the valve holder portion 3 side. It has a boss portion 22 protruding from the boss portion 22 and a connecting portion 23 having a diameter smaller than that of the boss portion 22. A vertical pressure equalizing passage 2a extending upward from the inner space 21A is formed in the center of the upper top portion of the valve body portion 21 and the boss portion 22, and the boss portion 22 is connected to the vertical pressure equalizing passage 2a and is connected to the boss portion 22. A lateral pressure equalizing path 2b that opens on the outer periphery of the is formed.

弁ホルダ部３は、「回転軸受」としてのベアリング３１と、「カバー部材」としての筒状の円筒ケース３２と、ベアリング３１と円筒ケース３２との間に配設されたガイド３３と、円筒ケース３２の下端に固着された固定金具３４と、固定金具３４に当接される弁側スリーブ３５と、弁側スリーブ３５とベアリング３１との間に配設されたコイルばね３６と、軸側スリーブ３７と、を備えている。 The valve holder portion 3 includes a bearing 31 as a "rotary bearing", a cylindrical cylindrical case 32 as a "cover member", a guide 33 disposed between the bearing 31 and the cylindrical case 32, and a cylindrical case. A fixing bracket 34 fixed to the lower end of 32, a valve-side sleeve 35 abutting on the fixing bracket 34, a coil spring 36 disposed between the valve-side sleeve 35 and the bearing 31, and a shaft-side sleeve 37. And have.

ベアリング３１は、内輪３１ａと、外輪３１ｂと、複数のボール３１ｃとで構成されており、コイルばね３６は外輪３１ｂに当接されている。また、後述のロータ軸５１が内輪３１ａ内に嵌合され、この内輪３１ａにロータ軸５１のフランジ部５１ｂが当接されるとともに、ロータ軸５１の下端部に軸側スリーブ３７が溶接により固定されている。また、コイルばね３６の付勢力によりベアリング３１の外輪３１ｂが上方に付勢され、ガイド３３が円筒ケース３２の上端の内側フランジ部に圧接されている。これにより、円筒ケース３２とロータ軸５１とは軸線Ｘ回りに相互に相対回転自在となっている。 The bearing 31 is composed of an inner ring 31a, an outer ring 31b, and a plurality of balls 31c, and the coil spring 36 is in contact with the outer ring 31b. Further, the rotor shaft 51 described later is fitted into the inner ring 31a, the flange portion 51b of the rotor shaft 51 is brought into contact with the inner ring 31a, and the shaft side sleeve 37 is fixed to the lower end portion of the rotor shaft 51 by welding. ing. Further, the outer ring 31b of the bearing 31 is urged upward by the urging force of the coil spring 36, and the guide 33 is pressed against the inner flange portion at the upper end of the cylindrical case 32. As a result, the cylindrical case 32 and the rotor shaft 51 are relatively rotatable about the axis X.

また、弁部材２のボス部２２が固定金具３４の挿通孔３４ａ内に挿通され、弁部材２の連結部２３に弁側スリーブ３５が嵌め込まれている。そして、弁側スリーブ３５と連結部２３とが溶接により固着されている。そして、コイルばね３６の付勢力により、弁側スリーブ３５が固定金具３４に圧接されている。これにより、弁部材２が、弁ホルダ部３のベアリング３１とは反対側に保持されている。 Further, the boss portion 22 of the valve member 2 is inserted into the insertion hole 34a of the fixing bracket 34, and the valve side sleeve 35 is fitted into the connecting portion 23 of the valve member 2. Then, the valve side sleeve 35 and the connecting portion 23 are fixed by welding. Then, the valve side sleeve 35 is pressed against the fixing bracket 34 by the urging force of the coil spring 36. As a result, the valve member 2 is held on the side of the valve holder portion 3 opposite to the bearing 31.

「ホルダガイド部」としての支持部材４は弁ガイド部７の上端の開口部に取り付けられている。支持部材４は、弁ガイド部７の内周面内に圧入される圧入部４１と、圧入部４１の内側に位置する略円柱状のガイド部４２と、ガイド部４２の上部に延設されたネジホルダ部４３と、ガイド部４２の外周に位置するリング状のフランジ部４４とを有している。なお、圧入部４１は軸線Ｘ回りで四方に突出するように形成されたものであるが、図１及び図２では４５°回転した位置に仮想線で図示してある。圧入部４１、ガイド部４２、ネジホルダ部４３は樹脂製の一体品として構成されている。また、フランジ部４４は、例えば、黄銅、ステンレス等の金属板であり、軸線Ｘを中心とするドーナツ盤状の平板である。また、フランジ部４４は、インサート成形により樹脂製の圧入部４１、ガイド部４２及びネジホルダ部４３と共に一体に設けられている。 The support member 4 as the "holder guide portion" is attached to the opening at the upper end of the valve guide portion 7. The support member 4 is extended above the press-fitting portion 41 that is press-fitted into the inner peripheral surface of the valve guide portion 7, a substantially columnar guide portion 42 located inside the press-fitting portion 41, and the upper portion of the guide portion 42. It has a screw holder portion 43 and a ring-shaped flange portion 44 located on the outer periphery of the guide portion 42. The press-fitting portion 41 is formed so as to project in all directions around the axis X, but is illustrated by a virtual line at a position rotated by 45 ° in FIGS. 1 and 2. The press-fitting portion 41, the guide portion 42, and the screw holder portion 43 are configured as an integral product made of resin. Further, the flange portion 44 is, for example, a metal plate such as brass or stainless steel, and is a donut disk-shaped flat plate centered on the axis X. Further, the flange portion 44 is integrally provided together with the resin press-fitting portion 41, the guide portion 42, and the screw holder portion 43 by insert molding.

そして、支持部材４は弁ガイド部７に組み付けられ、フランジ部４４を介して弁ガイド部７の上端部に溶接により固定されている。また、支持部材４において、ガイド部４２には軸線Ｘと同軸の円筒形状のガイド孔４２ａが形成されるとともに、ネジホルダ部４３の中心には、ガイド孔４２ａと同軸の雌ねじ部４３ａとそのねじ孔が形成されている。さらに、図３に示すように、隣接する２つの圧入部４１，４１の間は弁ガイド部７から離間して流路４１ａを形成するとともに、フランジ部４４には、流路４１ａに対応する位置に流路４４ａが形成されている。この流路４１ａ，４４ａは、弁ガイド部７の内側から密閉ケース６内へ流体を流すための流路である。 Then, the support member 4 is assembled to the valve guide portion 7 and fixed to the upper end portion of the valve guide portion 7 via the flange portion 44 by welding. Further, in the support member 4, a cylindrical guide hole 42a coaxial with the axis X is formed in the guide portion 42, and a female screw portion 43a coaxial with the guide hole 42a and a screw hole thereof are formed at the center of the screw holder portion 43. Is formed. Further, as shown in FIG. 3, the two adjacent press-fitting portions 41 and 41 are separated from the valve guide portion 7 to form the flow path 41a, and the flange portion 44 has a position corresponding to the flow path 41a. A flow path 44a is formed in the flow path 44a. The flow paths 41a and 44a are flow paths for flowing a fluid from the inside of the valve guide portion 7 into the closed case 6.

ステッピングモータ５は、「作動軸」としてのロータ軸５１と、密閉ケース６の内部に回転可能に配設されたマグネットロータ５２と、密閉ケース６の外周においてマグネットロータ５２に対して対向配置されたステータコイル５３と、その他、図示しないヨークや外装部材等により構成されている。ロータ軸５１はブッシュを介してマグネットロータ５２の中心に取り付けられ、このロータ軸５１の支持部材４側の外周には雄ねじ部５１ａが形成されている。そして、この雄ねじ部５１ａが支持部材４の雌ねじ部４３ａに螺合されている。これにより、支持部材４はロータ軸５１を軸線Ｘ上に支持している。 The stepping motor 5 is arranged so as to face the rotor shaft 51 as the "operating shaft", the magnet rotor 52 rotatably arranged inside the sealed case 6, and the magnet rotor 52 on the outer periphery of the sealed case 6. It is composed of a stator coil 53, a yoke, an exterior member, and the like (not shown). The rotor shaft 51 is attached to the center of the magnet rotor 52 via a bush, and a male screw portion 51a is formed on the outer periphery of the rotor shaft 51 on the support member 4 side. Then, the male threaded portion 51a is screwed into the female threaded portion 43a of the support member 4. As a result, the support member 4 supports the rotor shaft 51 on the axis X.

密閉ケース６は、上端部が塞がれた略円筒形状に形成されており、弁ガイド部７の上端に溶接によって気密に固定されている。密閉ケース６の内部天井にはスリーブ６１が設けられ、このスリーブ６１の中央にガイド６２が設けられている。そして、ロータ軸５１の上端部がガイド６２により支持されている。なお、スリーブ６１の外周には回転ストッパ機構６３が設けられている。 The sealed case 6 is formed in a substantially cylindrical shape with the upper end closed, and is airtightly fixed to the upper end of the valve guide portion 7 by welding. A sleeve 61 is provided on the inner ceiling of the sealed case 6, and a guide 62 is provided in the center of the sleeve 61. The upper end of the rotor shaft 51 is supported by the guide 62. A rotation stopper mechanism 63 is provided on the outer circumference of the sleeve 61.

弁ガイド部７は、軸線Ｘを中心軸として、弁ハウジング１の上半部に嵌合固定された円筒部７１と、円筒部７１の弁ポート１３ａ側に固着されたガイド部７２と、円筒部７１とガイド部７２とに挟持されて固定されたシール部７３とを有している。そして、弁部材２の弁体部２１は、主にガイド部７２内に配置され、シール部７３に密着して嵌挿されている。シール部７３は、薄手で円環状の金属板からなる一対の板ばね７３ａと、フッ素樹脂、例えばＰＴＦＥ、ＰＦＡ製で円環状の一対のＬパッキン７３ｂと、金属板からなる円環状の補強板７３ｃとで構成されている。そして、Ｌパッキン７３ｂの間に補強板７３ｃを挟み込んで、Ｌパッキン７３ｂに重ねて板ばね７３ａが嵌め込まれている。そして、円筒部７１とガイド部７２とで板ばね７３ａを押さえ付けるようにして、シール部７３が取り付けられている。 The valve guide portion 7 has a cylindrical portion 71 fitted and fixed to the upper half of the valve housing 1 with the axis X as the central axis, a guide portion 72 fixed to the valve port 13a side of the cylindrical portion 71, and a cylindrical portion. It has a seal portion 73 sandwiched and fixed between the 71 and the guide portion 72. The valve body portion 21 of the valve member 2 is mainly arranged in the guide portion 72, and is fitted and fitted in close contact with the seal portion 73. The seal portion 73 includes a pair of leaf springs 73a made of a thin and annular metal plate, a pair of annular L packings 73b made of fluororesin such as PTFE or PFA, and an annular reinforcing plate 73c made of a metal plate. It is composed of and. Then, the reinforcing plate 73c is sandwiched between the L packings 73b, and the leaf spring 73a is fitted on the L packing 73b. Then, the seal portion 73 is attached so that the leaf spring 73a is pressed by the cylindrical portion 71 and the guide portion 72.

以上のように、シール部７３が弁体部２１の外周に密接された状態で弁部材２の一部が弁ガイド部７内に収容されることにより、弁ガイド部７の内部の空間が区画され、円筒部７１内に弁部材３に対する背圧室７Ａが形成されている。 As described above, a part of the valve member 2 is housed in the valve guide portion 7 in a state where the seal portion 73 is in close contact with the outer periphery of the valve body portion 21, so that the space inside the valve guide portion 7 is partitioned. A back pressure chamber 7A for the valve member 3 is formed in the cylindrical portion 71.

なお、背圧室７Ａ内にはコイルばね７４が配設されており、このコイルばね７４は、弁体部２１の肩部に配設されたばね受け７５と支持部材４の圧入部４１との間で圧縮した状態で配設されている。そして、コイルばね７４の付勢力により、支持部材４（その雌ねじ部４３ａ）に対して弁ホルダ部３及びロータ軸５１（その雄ねじ部５１ａ）が常時弁ポート１３ａ側に付勢される。これにより、弁閉から弁開となる時の流量特性と弁開から弁閉となるときの流量特性の差である、ヒステリシスを低減できる。 A coil spring 74 is disposed in the back pressure chamber 7A, and the coil spring 74 is located between the spring receiver 75 disposed on the shoulder portion of the valve body portion 21 and the press-fitting portion 41 of the support member 4. It is arranged in a compressed state with. Then, the valve holder portion 3 and the rotor shaft 51 (the male screw portion 51a) are constantly urged toward the valve port 13a with respect to the support member 4 (the female screw portion 43a) by the urging force of the coil spring 74. As a result, hysteresis, which is the difference between the flow rate characteristic when the valve is closed and the valve is opened, and the flow rate characteristic when the valve is opened and the valve is closed, can be reduced.

以上の構成により、ステッピングモータ５の駆動により、マグネットロータ５２及びロータ軸５１が回転し、雄ねじ部５１ａと雌ねじ部４３ａとのネジ送り機構によりロータ軸５１、弁ホルダ部３及び弁部材２が軸線Ｘ方向に上下動する。これにより、弁部材２が弁ガイド部７にガイドされて弁座部材１３のテーパ１３ｂに対して離座／着座する。これにより、弁ポート１３ａが開閉される。なお、このネジ送り機構によりロータ軸５１は軸線Ｘ回りに回動するが、この回転力は、「回転軸受」としてのベアリング３１の作用により、弁部材２に伝達されることはない。 With the above configuration, the magnet rotor 52 and the rotor shaft 51 are rotated by driving the stepping motor 5, and the rotor shaft 51, the valve holder portion 3 and the valve member 2 are aligned by the screw feed mechanism of the male screw portion 51a and the female screw portion 43a. It moves up and down in the X direction. As a result, the valve member 2 is guided by the valve guide portion 7 and is separated / seated with respect to the taper 13b of the valve seat member 13. As a result, the valve port 13a is opened and closed. The rotor shaft 51 is rotated around the axis X by this screw feed mechanism, but this rotational force is not transmitted to the valve member 2 by the action of the bearing 31 as a "rotary bearing".

この実施形態の電動弁は、例えば流体（冷媒）が継手管１１から流入して継手管１２から流出する第１の流れと、流体が継手管１２から流入して継手管１１から流出する第２の流れとの、２通りの流れの制御に用いられる。すなわち、第１の流れでは継手管１１が流入口、継手管１２が流出口であり、第２の流れでは継手管１２が流入口、継手管１１が流出口である。ここで、弁部材２の内空間２１Ａ、縦均圧路２ａ及び横均圧路２ｂが、弁ポート１３ａと背圧室７Ａとを導通して均圧する「均圧流路」を構成している。これにより、第１の流れのときは、弁ポート１３ａの低圧が前記「均圧流路」を介して背圧室７Ａに導入される。また、第２の流れのときは、弁ポート１３ａ側の高圧が「均圧流路」を介して背圧室７Ａに導入される。したがって、弁部材２に対して弁ポート１３ａと背圧室７Ａとの両側から同じ圧力が作用する。これにより、流体の高圧と低圧との差圧による力は弁部材２に対して軸線Ｘ方向で相殺され、圧力バランスが保たれる。 In the electric valve of this embodiment, for example, a first flow in which a fluid (fluid) flows in from the joint pipe 11 and flows out from the joint pipe 12, and a second flow in which the fluid flows in from the joint pipe 12 and flows out from the joint pipe 11. It is used to control two types of flow, that is, the flow of. That is, in the first flow, the joint pipe 11 is the inflow port and the joint pipe 12 is the outflow port, and in the second flow, the joint pipe 12 is the inflow port and the joint pipe 11 is the outflow port. Here, the inner space 21A, the vertical pressure equalizing passage 2a, and the horizontal pressure equalizing passage 2b of the valve member 2 form a "pressure equalizing flow path" that conducts the valve port 13a and the back pressure chamber 7A to equalize the pressure. As a result, in the case of the first flow, the low pressure of the valve port 13a is introduced into the back pressure chamber 7A via the "pressure equalizing flow path". Further, in the second flow, the high pressure on the valve port 13a side is introduced into the back pressure chamber 7A via the “pressure equalizing flow path”. Therefore, the same pressure acts on the valve member 2 from both sides of the valve port 13a and the back pressure chamber 7A. As a result, the force due to the differential pressure between the high pressure and the low pressure of the fluid is canceled with respect to the valve member 2 in the axis X direction, and the pressure balance is maintained.

ここで、弁部材２が弁座部材１３に着座していて第２の流れの場合、弁ポート１３ａからの高圧の流体が内空間２１Ａ、縦均圧路２ａ及び横均圧路２ｂを介して背圧室７Ａに流れ込むが、この高圧の流体は、流路４１ａ，４４ａを介して密閉ケース６内に流れ込む。また、支持部材４のガイド孔４２ａ内にも円筒ケース３２とガイド部４２とのクリアランスを介して流れ込む。しかし、流路４１ａ，４４ａを介して密閉ケース６内に流れ込む流量の方がガイド孔４２ａ内に流れ込む流量よりも圧倒的に多い。これは密閉ケース６内は容積が大きいために、初期段階では密閉ケース６内と背圧室７Ａ内との圧力差が大きいためである。なお、ガイド孔４２ａ内にも高圧が加わることで、このガイド孔４２ａ内と背圧室７Ａとも均圧される。 Here, when the valve member 2 is seated on the valve seat member 13 and the second flow occurs, the high-pressure fluid from the valve port 13a passes through the inner space 21A, the vertical pressure equalizing path 2a, and the horizontal pressure equalizing path 2b. It flows into the back pressure chamber 7A, and this high-pressure fluid flows into the closed case 6 through the flow paths 41a and 44a. Further, it also flows into the guide hole 42a of the support member 4 through the clearance between the cylindrical case 32 and the guide portion 42. However, the flow rate flowing into the sealed case 6 through the flow paths 41a and 44a is overwhelmingly larger than the flow rate flowing into the guide hole 42a. This is because the inside of the closed case 6 has a large volume, so that the pressure difference between the inside of the closed case 6 and the inside of the back pressure chamber 7A is large at the initial stage. By applying a high pressure to the inside of the guide hole 42a, the pressure inside the guide hole 42a and the back pressure chamber 7A are equalized.

このように、高圧の流体の流れは、図２に矢印で示すように、弁ホルダ部３を迂回してその外側を流れる。しかも、弁ホルダ部３において、ベアリング３１は「カバー部材」としての円筒ケース３２によって包含されている。したがって、ベアリング３１の内部に異物等が侵入するのを防止できる。 In this way, the flow of the high-pressure fluid bypasses the valve holder portion 3 and flows outside the valve holder portion 3 as shown by an arrow in FIG. Moreover, in the valve holder portion 3, the bearing 31 is included by the cylindrical case 32 as a "cover member". Therefore, it is possible to prevent foreign matter and the like from entering the inside of the bearing 31.

図４は実施形態の冷凍サイクルシステムを示す図である。図において、符号１００は膨張弁を構成する本発明の各実施形態の電動弁、２００は室外ユニットに搭載された室外熱交換器、３００は室内ユニットに搭載された室内熱交換器、４００は四方弁を構成する流路切換弁、５００は圧縮機である。電動弁１００、室外熱交換器２００、室内熱交換器３００、流路切換弁４００、及び圧縮機５００は、それぞれ導管によって図示のように接続され、ヒートポンプ式の冷凍サイクルを構成している。なお、アキュムレータ、圧力センサ、温度センサ等は図示を省略してある。 FIG. 4 is a diagram showing a refrigeration cycle system of the embodiment. In the figure, reference numeral 100 is an electric valve of each embodiment of the present invention constituting an expansion valve, 200 is an outdoor heat exchanger mounted on an outdoor unit, 300 is an indoor heat exchanger mounted on an indoor unit, and 400 is a four-way valve. The flow path switching valve 500 constituting the valve is a compressor. The electric valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are each connected as shown by a conduit to form a heat pump type refrigeration cycle. The accumulator, pressure sensor, temperature sensor, etc. are not shown.

冷凍サイクルの流路は、流路切換弁４００により冷房運転時の流路と暖房運転時の流路の２通りに切換えられる。冷房運転時には、図に実線の矢印で示したように、圧縮機５００で圧縮された冷媒は流路切換弁４００から室外熱交換器２００に流入され、この室外熱交換器２００は凝縮器として機能し、室外熱交換器２００から流出された液冷媒は電動弁１００を介して室内熱交換器３００に流入され、この室内熱交換器３００は蒸発器として機能する。 The flow path of the refrigeration cycle is switched between the flow path during the cooling operation and the flow path during the heating operation by the flow path switching valve 400. During the cooling operation, as shown by the solid arrow in the figure, the refrigerant compressed by the compressor 500 flows into the outdoor heat exchanger 200 from the flow path switching valve 400, and the outdoor heat exchanger 200 functions as a condenser. Then, the liquid refrigerant flowing out from the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 via the electric valve 100, and the indoor heat exchanger 300 functions as an evaporator.

一方、暖房運転時には、図に破線の矢印で示したように、圧縮機５００で圧縮された冷媒は流路切換弁４００から室内熱交換器３００、電動弁１００、室外熱交換器２００、流路切換弁４００、そして、圧縮機５００の順に循環され、室内熱交換器３００が凝縮器として機能し、室外熱交換器２００が蒸発器として機能する。電動弁１００は、冷房運転時に室外熱交換器２００から流入する液冷媒、または暖房運転時に室内熱交換器３００から流入する液冷媒を、それぞれ減圧膨張し、さらにその冷媒の流量を制御する。 On the other hand, during the heating operation, as shown by the broken arrow in the figure, the refrigerant compressed by the compressor 500 is transferred from the flow path switching valve 400 to the indoor heat exchanger 300, the electric valve 100, the outdoor heat exchanger 200, and the flow path. The switching valve 400 and the compressor 500 are circulated in this order, the indoor heat exchanger 300 functions as a condenser, and the outdoor heat exchanger 200 functions as an evaporator. The electric valve 100 decompresses and expands the liquid refrigerant flowing from the outdoor heat exchanger 200 during the cooling operation and the liquid refrigerant flowing from the indoor heat exchanger 300 during the heating operation, and further controls the flow rate of the refrigerant.

以上の実施形態では、流路４１ａ，４４ａを支持部材４のガイド部４２の外周に設けるようにしているが、例えば、弁部材２の中心から、弁ホルダ部３の内側、ベアリング３１の内輪３１ａの内側及びロータ軸５１の中心に、弁ポート１３ａから密閉ケース６に流体を流すような流路を形成してもよい。 In the above embodiment, the flow paths 41a and 44a are provided on the outer periphery of the guide portion 42 of the support member 4, but for example, from the center of the valve member 2, the inside of the valve holder portion 3 and the inner ring 31a of the bearing 31. A flow path for flowing a fluid from the valve port 13a to the closed case 6 may be formed on the inside of the rotor shaft 51 and in the center of the rotor shaft 51.

また、以上の実施形態では、支持部材４に雌ねじ部４３ａが形成され、ロータ軸５１に雄ねじ部５１ａが形成されて、この雄ねじ部５１ａが雌ねじ部４３ａに螺合されて、ネジ送り機構を構成しているが、このねじの組み合わせに限るものではなく、逆に、支持部材と同様な部材に雄ねじ部が形成され、マグネットロータ側に雌ねじ部が形成され、上記とは雌ねじと雄ねじとが逆配置の電動弁としてもよい。 Further, in the above embodiment, the female screw portion 43a is formed on the support member 4, the male screw portion 51a is formed on the rotor shaft 51, and the male screw portion 51a is screwed into the female screw portion 43a to form a screw feed mechanism. However, the combination of the screws is not limited to this, and conversely, a male screw portion is formed on a member similar to the support member, a female screw portion is formed on the magnet rotor side, and the female screw and the male screw are opposite to the above. It may be an electric valve arranged.

以上、本発明の実施の形態について図面を参照して詳述してきたが、具体的な構成はこれらの実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。 Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention.

１ 弁ハウジング
１Ａ 弁室
１１ 継手管
１３ 弁座部材
１３ａ 弁ポート
１３ｂ テーパ面
１２ 継手管
２ 弁部材
２ａ 縦均圧路（均圧路）
２ｂ 横均圧路（均圧路）
２１ 弁体部
２１ａ 流量制御部
２１Ａ 内空間
２２ ボス部
２３ 連結部
３ 弁ホルダ部
３１ ベアリング（回転軸受）
３１ａ 内輪
３１ｂ 外輪
３１ｃ ボール
３２ 円筒ケース（カバー部材）
３３ ガイド
３４ 固定金具
３５ 弁側スリーブ
３６ コイルばね
３７ 軸側スリーブ
４ 支持部材（ホルダガイド部）
４１ 圧入部
４１ａ 流路
４２ ガイド部
４２ａ ガイド孔
４３ ネジホルダ部
４３ａ 雌ねじ部
４４ フランジ部
４４ａ 流路
５ ステッピングモータ（電動モータ）
５１ ロータ軸（作動軸）
５１ａ 雄ねじ部
５２ マグネットロータ
５３ ステータコイル
６ 密閉ケース
７ 弁ガイド部
７Ａ 背圧室
７１ 円筒部
７２ ガイド部
７３ シール部
７３ａ 板ばね
７３ｂ Ｌパッキン
７３ｃ 補強板
Ｘ 軸線
１００ 電動弁
２００ 室外熱交換器
３００ 室内熱交換器
４００ 流路切換弁
５００ 圧縮機 1 Valve housing 1A Valve chamber 11 Joint pipe 13 Valve seat member 13a Valve port 13b Tapered surface 12 Joint pipe 2 Valve member 2a Vertical pressure equalizing path (pressure equalizing path)
2b Horizontal pressure equalizing path (pressure equalizing path)
21 Valve body 21a Flow control 21A Inner space 22 Boss 23 Connecting part 3 Valve holder part 31 Bearing (rotary bearing)
31a Inner ring 31b Outer ring 31c Ball 32 Cylindrical case (cover member)
33 Guide 34 Fixing bracket 35 Valve side sleeve 36 Coil spring 37 Shaft side sleeve 4 Support member (holder guide part)
41 Press-fitting part 41a Flow path 42 Guide part 42a Guide hole 43 Screw holder part 43a Female thread part 44 Flange part 44a Flow path 5 Stepping motor (electric motor)
51 Rotor shaft (operating shaft)
51a Male screw part 52 Magnet rotor 53 Stator coil 6 Sealed case 7 Valve guide part 7A Back pressure chamber 71 Cylindrical part 72 Guide part 73 Seal part 73a Leaf spring 73b L packing 73c Reinforcing plate X Axis line 100 Electric valve 200 Outdoor heat exchanger 300 Indoor Heat exchanger 400 Flow switching valve 500 Compressor

Claims (5)

弁ハウジングの弁室内で作動軸に連動する弁部材により弁ポートを開閉する電動弁であって、
前記作動軸に連結される回転軸受を有するとともに該回転軸受とは反対側に前記弁部材を保持する弁ホルダ部と、前記弁ホルダ部をガイドするホルダガイド部と、を備え、
前記弁ホルダ部が、前記ホルダガイド部のガイド孔内に内挿されるとともに前記回転軸受を内包する円筒状のカバー部材を備え、
前記作動軸には雄ねじ部が形成され、該雄ねじ部は、前記ガイド孔と同軸のねじ孔が形成されたネジホルダ部の雌ねじ部に螺合され、前記雄ねじ部と前記雌ねじ部とで前記作動軸を軸線方向に移動させるネジ送り機構が構成され、
前記回転軸受は、前記作動軸の弁ポート側に設けられたフランジ部の弁ポート側に接続され、該作動軸に嵌合する内輪と、該内輪を周方向に囲む外輪と、前記内輪と前記外輪との間に介在する複数のボールと、を備え、
前記弁部材と、前記回転軸受の前記外輪との間に付勢ばねが介装されていることを特徴とする電動弁。 An electric valve that opens and closes the valve port with a valve member linked to the operating shaft in the valve chamber of the valve housing.
A valve holder portion that has a rotary bearing connected to the operating shaft and holds the valve member on the side opposite to the rotary bearing, and a holder guide portion that guides the valve holder portion are provided.
The valve holder portion is provided with a cylindrical cover member that is inserted into the guide hole of the holder guide portion and includes the rotary bearing .
A male screw portion is formed on the operating shaft, and the male screw portion is screwed into a female screw portion of a screw holder portion having a screw hole coaxial with the guide hole, and the male screw portion and the female screw portion form the operating shaft. A screw feed mechanism is configured to move the shaft in the axial direction.
The rotary bearing is connected to the valve port side of a flange portion provided on the valve port side of the operating shaft, and has an inner ring that fits the operating shaft, an outer ring that surrounds the inner ring in the circumferential direction, and the inner ring and the above. With multiple balls intervening between the outer ring,
An electric valve characterized in that an urging spring is interposed between the valve member and the outer ring of the rotary bearing. 前記弁部材に対する背圧室の流体圧力と前記弁ポートの流体圧力とが均一にされる圧力バランス型であることを特徴とする請求項１に記載の電動弁。 The electric valve according to claim 1, wherein the electric valve is a pressure-balanced type in which the fluid pressure in the back pressure chamber with respect to the valve member and the fluid pressure in the valve port are made uniform. 弁ハウジングの弁室内で作動軸に連動する弁部材により弁ポートを開閉する電動弁であって、
前記作動軸に連結される回転軸受を有するとともに該回転軸受とは反対側に前記弁部材を保持する弁ホルダ部と、前記弁ホルダ部をガイドするホルダガイド部と、を備え、
前記弁ホルダ部が、前記ホルダガイド部のガイド孔内に内挿されるとともに前記回転軸受を内包する円筒状のカバー部材を備え、
前記弁部材に対する背圧室の流体圧力と前記弁ポートの流体圧力とが均一にされる圧力バランス型であり、
電動モータのロータが密閉ケース内に収容されて該密閉ケースが前記弁ハウジングに気密に組み付けられ、前記ロータの回転によりネジ送り機構を介して前記作動軸を軸線方向に移動させるよう構成されるとともに、前記弁部材が内挿されて前記弁室内に配設された弁ガイド部と、前記弁ガイド部と前記弁部材との間で前記弁室と前記背圧室とを封止するシール部と、を備え、
前記弁ホルダ部が、前記シール部によって前記弁室から封止された前記背圧室内で前記ホルダガイド部によってガイドされるよう構成されるとともに、前記ホルダガイド部の外周に、前記背圧室から前記密閉ケースへ流体を流す流路が設けられていることを特徴とする電動弁。 An electric valve that opens and closes the valve port with a valve member linked to the operating shaft in the valve chamber of the valve housing.
A valve holder portion that has a rotary bearing connected to the operating shaft and holds the valve member on the side opposite to the rotary bearing, and a holder guide portion that guides the valve holder portion are provided.
The valve holder portion is provided with a cylindrical cover member that is inserted into the guide hole of the holder guide portion and includes the rotary bearing.
It is a pressure balance type in which the fluid pressure in the back pressure chamber with respect to the valve member and the fluid pressure in the valve port are made uniform.
The rotor of the electric motor is housed in a sealed case, the sealed case is airtightly assembled to the valve housing, and the rotation of the rotor is configured to move the operating shaft in the axial direction via a screw feed mechanism. , A valve guide portion in which the valve member is inserted and arranged in the valve chamber, and a seal portion that seals the valve chamber and the back pressure chamber between the valve guide portion and the valve member. , With
The valve holder portion is configured to be guided by the holder guide portion in the back pressure chamber sealed from the valve chamber by the seal portion, and on the outer periphery of the holder guide portion, from the back pressure chamber. An electric valve characterized in that a flow path for flowing a fluid is provided in the closed case. 前記ホルダガイド部が、前記作動軸と共に前記ネジ送り機構を構成していることを特徴とする請求項３に記載の電動弁。 The electric valve according to claim 3, wherein the holder guide portion constitutes the screw feed mechanism together with the operating shaft. 圧縮機と、凝縮器と、膨張弁と、蒸発器と、を含む冷凍サイクルシステムであって、請求項１〜４のいずれか一項に記載の電動弁が、前記膨張弁として用いられていることを特徴とする冷凍サイクルシステム。 A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve according to any one of claims 1 to 4 is used as the expansion valve. A refrigeration cycle system characterized by that.
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