JP7175035B2 - flow control valve - Google Patents

flow control valve Download PDF

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JP7175035B2
JP7175035B2 JP2021001330A JP2021001330A JP7175035B2 JP 7175035 B2 JP7175035 B2 JP 7175035B2 JP 2021001330 A JP2021001330 A JP 2021001330A JP 2021001330 A JP2021001330 A JP 2021001330A JP 7175035 B2 JP7175035 B2 JP 7175035B2
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valve
flow control
cylindrical portion
control valve
male threaded
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JP2022106385A (en
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康平 菱谷
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Fujikoki Corp
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Fujikoki Corp
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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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • 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)

Description

本発明は、流量制御弁に関する。 The present invention relates to flow control valves.

冷凍サイクルにおいて流量制御弁として使用されるモータ駆動型の電動弁は、モータにより回転駆動される弁軸の雄ねじ部を弁本体に設けられた雌ねじ孔に螺合させてなるねじ機構を有し、このねじ機構により回転運動を軸線方向運動に変換することによって、弁軸を軸線方向に変位させ、流量を制御している。 A motor-driven valve used as a flow control valve in a refrigeration cycle has a screw mechanism in which a male threaded portion of a valve shaft rotated by a motor is screwed into a female threaded hole provided in a valve body, The screw mechanism converts rotary motion into axial motion, thereby displacing the valve stem in the axial direction and controlling the flow rate.

例えば特許文献１に示すような流量制御弁において、内部に弁室を画成する弁本体と、モータのロータ及びねじ機構を収容する有底円筒状のキャンとが接合されている。かかる流量制御弁において、ロータに連結されたロータ軸の雄ねじ部が、雌ねじ孔に対して回転することによりロータ軸を軸線方向に移動させ、ニードル弁を保持する弁ホルダを軸線方向に移動させることができる。また、密閉された弁本体及びキャン内は冷媒で満たされている。 For example, in a flow control valve as disclosed in Patent Document 1, a valve body defining a valve chamber therein is joined to a bottomed cylindrical can that accommodates a rotor of a motor and a screw mechanism. In such a flow control valve, the male threaded portion of the rotor shaft connected to the rotor rotates with respect to the female threaded hole, thereby axially moving the rotor shaft and axially moving the valve holder holding the needle valve. can be done. In addition, the sealed valve body and can are filled with refrigerant.

特開２０１８－１１９５９５号公報JP 2018-119595 A

ところで、冷凍サイクル内を循環する冷媒には、コンプレッサなどの稼働中に異物が混入することがある。このため、異物が混入した冷媒が配管を通って流量制御弁の弁本体及びキャン内に進入し、ねじ機構付近に到達することも予想される。かかる場合、特許文献１の流量制御弁においては、雄ねじ部の端部が雌ねじ孔から外部に露出しているため、雄ねじ部に付着した異物が、ロータ軸の軸線方向移動に伴い雌ねじ孔内に進入し、それによりねじ間で噛み込みなどが生じ、ねじ機構の円滑な動作が阻害されるおそれがある。 By the way, the refrigerant circulating in the refrigerating cycle may be contaminated with foreign matter during operation of the compressor or the like. Therefore, it is expected that the refrigerant mixed with foreign matter may enter the valve body and the can of the flow control valve through the pipe and reach the vicinity of the screw mechanism. In such a case, in the flow control valve of Patent Document 1, since the end of the male threaded portion is exposed to the outside from the female threaded hole, foreign matter adhering to the male threaded portion may enter the female threaded hole as the rotor shaft moves in the axial direction. The foreign matter may enter the screw mechanism, causing jamming or the like between the screws, thereby hindering the smooth operation of the screw mechanism.

これに対し、流量制御弁の冷媒の入口に目の細かいフィルタなどを配置して、冷媒に混入した異物を捕獲することも一案である。しかしながら、流量制御弁にフィルタなどを設置すると、流量制御弁のコスト増を招来し、また定期的にフィルタの清掃が必要になりメンテナンスの手間も増える。 On the other hand, it is also an idea to arrange a fine-mesh filter or the like at the inlet of the refrigerant of the flow control valve to catch the foreign matter mixed in the refrigerant. However, if a filter or the like is installed in the flow control valve, the cost of the flow control valve will increase, and the filter will need to be cleaned regularly, increasing the maintenance effort.

そこで本発明は、コストやメンテナンスの手間を抑制しつつ、円滑な動作を確保できる流量制御弁を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a flow control valve capable of ensuring smooth operation while suppressing costs and labor for maintenance.

上記課題を解決するために、本発明の流量制御弁は、
キャンと、
前記キャンに接合される弁本体と、
前記キャンと前記弁本体とで囲われた空間内に配置され、前記弁本体に対して回転可能な弁軸と、前記弁本体に対して固定されたガイドステムと、を有し、
前記弁軸は、一体の部材から構成され、雄ねじ部、前記雄ねじ部の上側に配置された上部円筒部、及び前記雄ねじ部の下側に配置された下部円筒部を有し、
前記ガイドステムは、前記雄ねじ部に螺合する雌ねじ孔、前記雌ねじ孔の上側に配置され、前記上部円筒部に対向する上端ガイド部、及び前記雌ねじ孔の下側に配置され、前記下部円筒部に対向する下端ガイド部を有し、
前記上端ガイド部と前記上部円筒部との径方向の隙間、及び前記下端ガイド部と前記下部円筒部との径方向の隙間はいずれも、前記雌ねじ孔と前記雄ねじ部との径方向の隙間より小さい、ことを特徴する。 In order to solve the above problems, the flow control valve of the present invention is
Can and
a valve body joined to the can;
Having a valve shaft arranged in a space surrounded by the can and the valve body and rotatable with respect to the valve body, and a guide stem fixed with respect to the valve body,
The valve stem is composed of an integral member and has a male threaded portion, an upper cylindrical portion arranged above the male threaded portion, and a lower cylindrical portion arranged below the male threaded portion ,
The guide stem includes a female threaded hole that is screwed into the male threaded portion, an upper end guide portion that is arranged above the female threaded hole and faces the upper cylindrical portion, and a lower cylindrical portion that is arranged below the female threaded hole. has a lower end guide portion facing the
Both the radial clearance between the upper end guide portion and the upper cylindrical portion and the radial clearance between the lower end guide portion and the lower cylindrical portion are larger than the radial clearance between the female threaded hole and the male threaded portion. Characterized by being small.

本発明によれば、コストやメンテナンスの手間を抑制しつつ、円滑な動作を確保できる流量制御弁を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the flow control valve which can ensure smooth operation|movement can be provided, suppressing the effort of cost and maintenance.

図１は、本発明の実施形態に係る流量制御弁を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing a flow control valve according to an embodiment of the invention. 図２は、流量制御弁の雌ねじ孔と雄ねじ部の一部を拡大して示す断面図である。FIG. 2 is a cross-sectional view showing an enlarged part of the female threaded hole and the male threaded portion of the flow control valve. 図３は、比較例にかかる流量制御弁を示す縦断面図である。FIG. 3 is a vertical cross-sectional view showing a flow control valve according to a comparative example.

以下、図面を参照して、本発明にかかる実施形態について説明する。 Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

図１は、本発明の実施形態に係る流量制御弁１を示す縦断面図である。ここで、流量制御弁１におけるロータ側を上方といい、ニードル弁側を下方という。 FIG. 1 is a longitudinal sectional view showing a flow control valve 1 according to an embodiment of the invention. Here, the rotor side of the flow control valve 1 is referred to as the upper side, and the needle valve side is referred to as the lower side.

（流量制御弁の構成）
流量制御弁１は、上端が開口した有底円筒状の弁本体１０と、弁本体１０の上端面に下端部が溶接等により密封接合された有頂円筒状のキャン４５と、弁本体１０の内側に固定されたガイドステム１５と、ガイドステム１５の内側に配設された弁軸２１と、弁軸２１に対し一体的に回動可能に連結固定されたロータ３０と、ロータ３０を回転駆動すべくキャン４５の外周に外嵌されたステータ５０とを備えている。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る。流量制御弁１の軸線をＬとする。 (Configuration of flow control valve)
The flow control valve 1 includes a bottomed cylindrical valve body 10 whose upper end is open, a capped cylindrical can 45 whose lower end is hermetically joined to the upper end surface of the valve body 10 by welding or the like, and the valve body 10. A guide stem 15 fixed inside, a valve shaft 21 arranged inside the guide stem 15, a rotor 30 integrally rotatably connected and fixed to the valve shaft 21, and the rotor 30 is driven to rotate. A stator 50 fitted on the outer circumference of the can 45 is provided. Here, the rotor 30 and the stator 50 constitute a stepping motor. Let L be the axis of the flow control valve 1 .

弁本体１０は、中空円筒部１０ａと底壁部１０ｂとを連設してなる。弁本体１０はＳＵＳ製の板材をプレス成形することによって形成できるが、ＳＵＳ素材を圧造することによって形成してもよい。 The valve body 10 is formed by connecting a hollow cylindrical portion 10a and a bottom wall portion 10b. The valve body 10 can be formed by press-molding a plate material made of SUS, but may be formed by forging a SUS material.

底壁部１０ｂにおいて、その中央に円形の開口１０ｄが形成されており、開口１０ｄには、弁座部材１１がロウ付け等で固定されている。弁座部材１１は、開口１０ｄに嵌合した小径円筒部１１ａと、小径円筒部１１ａより大径の大径円筒部１１ｂとを連設してなる。大径円筒部１１ｂの内周に第１の配管Ｔ１の端部が嵌挿され、ロウ付けなどにより接続されている。 A circular opening 10d is formed in the center of the bottom wall portion 10b, and a valve seat member 11 is fixed to the opening 10d by brazing or the like. The valve seat member 11 comprises a small-diameter cylindrical portion 11a fitted in the opening 10d and a large-diameter cylindrical portion 11b having a larger diameter than the small-diameter cylindrical portion 11a. The end of the first pipe T1 is inserted into the inner periphery of the large-diameter cylindrical portion 11b and connected by brazing or the like.

弁座部材１１は、その中央に貫通したオリフィス１１ｄを有し、オリフィス１１ｄの上端に弁座１１ｅが形成されている。オリフィス１１ｄは下端側に向かうにしたがって拡径している。 The valve seat member 11 has an orifice 11d passing through its center, and a valve seat 11e is formed at the upper end of the orifice 11d. The orifice 11d expands in diameter toward the lower end side.

弁本体１０の中空円筒部１０ａには、入口開口１０ｅが形成されており、入口開口１０ｅに第２の配管Ｔ２の端部が嵌挿され、ロウ付けなどにより接続されている。入口開口１０ｅの軸線をＯとする。 An inlet opening 10e is formed in the hollow cylindrical portion 10a of the valve body 10, and the end of the second pipe T2 is inserted into the inlet opening 10e and connected by brazing or the like. Let O be the axis of the entrance opening 10e.

弁本体１０の上端にキャン４５の下端が突き当てられた状態で、キャン４５の下端内周に鍔状円盤１８が嵌合しており、これらは溶接により接合されている。これにより、弁本体１０とキャン４５とが密閉した状態で一体化される。 With the lower end of the can 45 abutting against the upper end of the valve body 10, the collar-shaped disk 18 is fitted to the inner circumference of the lower end of the can 45, and these are joined by welding. As a result, the valve body 10 and the can 45 are integrated in a hermetically sealed state.

鍔状円盤１８は、複数の貫通孔１８ａを備えており、この貫通孔１８ａを介して、冷媒が弁本体１０側とキャン４５側との間で移動することを可能とする。 The brim-shaped disc 18 has a plurality of through holes 18a through which the refrigerant can move between the valve main body 10 side and the can 45 side.

図１において、キャン４５の外側において、ヨーク５１、ボビン５２、ステータコイル５３、及び樹脂モールドカバー（不図示）等からなるステータ５０が配置されている。ステータコイル５３は、不図示のリード線を介して外部の制御装置に接続され、ステータコイル５３の通電励磁によって、キャン４５内に配設されたロータ３０を軸線Ｌ回りに回転可能となっている。 In FIG. 1, a stator 50 including a yoke 51, a bobbin 52, a stator coil 53, and a resin mold cover (not shown) is arranged outside the can 45. As shown in FIG. The stator coil 53 is connected to an external control device via a lead wire (not shown), and the rotor 30 arranged in the can 45 can be rotated around the axis L by energization and excitation of the stator coil 53 . .

ロータ３０の内側に配設された樹脂製のガイドステム１５は、中実円筒状の本体１５ａと、中空円筒部１５ｂとを連設してなる。本体１５ａは、その中央を貫通する貫通開口１５ｅを有する。貫通開口１５ｅは、上端側の円筒状である上端ガイド部１５ｆと、下端側の円筒状である下端ガイド部１５ｇと、上端ガイド部１５ｆと下端ガイド部１５ｇとの間に形成された雌ねじ孔１５ｃとを有する。下端ガイド部１５ｇの内径は、弁軸２１の雄ねじ部２１ｂのねじ山外径より大きいため、ガイドステム１５に対して弁軸２１を下方より挿入して組み付けることができる。また上端ガイド部１５ｆの内径が、雄ねじ部２１ｂのねじ山外径より小さいため、その段部を利用して閉弁方向用可動ストッパ３５を設置できる。 The resin-made guide stem 15 disposed inside the rotor 30 comprises a solid cylindrical main body 15a and a hollow cylindrical portion 15b. The main body 15a has a through opening 15e passing through its center. The through opening 15e includes a cylindrical upper end guide portion 15f on the upper end side, a cylindrical lower end guide portion 15g on the lower end side, and a female screw hole 15c formed between the upper end guide portion 15f and the lower end guide portion 15g. and Since the inner diameter of the lower end guide portion 15g is larger than the outer diameter of the screw thread of the male thread portion 21b of the valve shaft 21, the valve shaft 21 can be inserted into the guide stem 15 from below. In addition, since the inner diameter of the upper end guide portion 15f is smaller than the outer diameter of the screw thread of the male screw portion 21b, the valve closing direction movable stopper 35 can be installed using the stepped portion.

中空円筒部１５ｂの中間部外周には、弁本体１０の上端に溶接された鍔状円盤１８が固定されており、この鍔状円盤１８を介して、ガイドステム１５は弁本体１０に対して固定されている。中空円筒部１５ｂには、均圧穴１５ｄが形成されている。 A collar-shaped disk 18 welded to the upper end of the valve body 10 is fixed to the outer periphery of the intermediate portion of the hollow cylindrical portion 15b. It is A pressure equalizing hole 15d is formed in the hollow cylindrical portion 15b.

また、ロータ３０及び弁軸２１の制御用原点位置を設定すべく、ガイドステム１５の本体１５ａの上面には、断面矩形状の閉弁方向用固定ストッパ５５が上向きに突設されており、またガイドステム１５の本体１５ａの下面には、断面矩形状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。ここで、ロータ３０及び弁軸２１の制御用原点位置とは、閉弁方向用可動ストッパ３５が閉弁方向用固定ストッパ５５に当接して係止され、ロータ３０及び弁軸２１が最下降位置に達した時の位置のことである。 In order to set the origin position for control of the rotor 30 and the valve shaft 21, a fixed stopper 55 for the valve closing direction having a rectangular cross section is provided on the upper surface of the main body 15a of the guide stem 15, and protrudes upward. A valve-opening direction fixed stopper 56 having a rectangular cross section projects downward from the lower surface of the main body 15 a of the guide stem 15 . Here, the origin position for control of the rotor 30 and the valve shaft 21 means that the movable stopper 35 for the valve-closing direction is in contact with the fixed stopper 55 for the valve-closing direction, and the rotor 30 and the valve shaft 21 are at the lowest position. is the position when it reaches

金属製の弁軸２１は、ロータ３０に取り付けられた環状の連結体３２が外嵌した端部２１ａと、ガイドステム１５の上端ガイド部１５ｆに嵌合する上部円筒部２１ｆと、雌ねじ孔１５ｃに螺合する雄ねじ部２１ｂと、下端ガイド部１５ｇに嵌合する下部円筒部２１ｇと、下端連結部２１ｄとを同軸に連設してなる。 The metal valve shaft 21 has an end portion 21a fitted with an annular connecting body 32 attached to the rotor 30, an upper cylindrical portion 21f fitted to the upper end guide portion 15f of the guide stem 15, and an internal screw hole 15c. A male threaded portion 21b to be screwed together, a lower cylindrical portion 21g to be fitted to the lower end guide portion 15g, and a lower end connecting portion 21d are coaxially connected.

ここで、上端ガイド部１５ｆと上部円筒部２１ｆとの径方向の隙間、及び下端ガイド部１５ｇと下部円筒部２１ｇとの径方向の隙間は、雌ねじ孔１５ｃと雄ねじ部２１ｂとの径方向の隙間より小さくなっている。 Here, the radial gap between the upper end guide portion 15f and the upper cylindrical portion 21f and the radial gap between the lower end guide portion 15g and the lower cylindrical portion 21g are the radial gaps between the female threaded hole 15c and the male threaded portion 21b. is getting smaller.

ここで、上端ガイド部１５ｆと上部円筒部２１ｆとの径方向の隙間は、上端ガイド部１５ｆの内径と、上部円筒部２１ｆの外径との差をいい、また下端ガイド部１５ｇと下部円筒部２１ｇとの径方向の隙間は、下端ガイド部１５ｇの内径と、下部円筒部２１ｇの外径との差をいう。雌ねじ孔１５ｃと雄ねじ部２１ｂとの径方向の隙間については、以下に説明する。 Here, the radial gap between the upper end guide portion 15f and the upper cylindrical portion 21f refers to the difference between the inner diameter of the upper end guide portion 15f and the outer diameter of the upper cylindrical portion 21f, and the gap between the lower end guide portion 15g and the lower cylindrical portion. 21g refers to the difference between the inner diameter of the lower end guide portion 15g and the outer diameter of the lower cylindrical portion 21g. The radial gap between the female threaded hole 15c and the male threaded portion 21b will be described below.

図２は、雌ねじ孔１５ｃと雄ねじ部２１ｂの一部を拡大して示す断面図である。雌ねじ孔１５ｃと雄ねじ部２１ｂとの間には、所定のガタが軸線方向に存在する。このガタがあるために、雌ねじ孔１５ｃと雄ねじ部２１ｂとは径方向にも相対的に動きうる。 FIG. 2 is a cross-sectional view showing an enlarged part of the female screw hole 15c and the male screw portion 21b. A predetermined backlash exists in the axial direction between the female threaded hole 15c and the male threaded portion 21b. Due to this backlash, the female threaded hole 15c and the male threaded portion 21b can also move relative to each other in the radial direction.

図２において、雌ねじ孔１５ｃに対して径方向に最も近接した雄ねじ部２１ｂを実線で示し、雌ねじ孔１５ｃに対して径方向に最も離間した雄ねじ部２１ｂを点線で示す。明らかであるが、雌ねじ孔１５ｃと雄ねじ部２１ｂの近接または離間状態は、軸線Ｌを挟んだ反対側では逆になる。 In FIG. 2, the male threaded portion 21b radially closest to the female threaded hole 15c is indicated by a solid line, and the male threaded portion 21b radially most distant from the female threaded hole 15c is indicated by a dotted line. As is apparent, the proximity or separation between the female threaded hole 15c and the male threaded portion 21b is reversed on the opposite side with the axis L interposed therebetween.

図２において、雌ねじ孔１５ｃと、雌ねじ孔１５ｃから最も離間した雄ねじ部２１ｂとの径方向の距離Δ（図２中のΔＭａｘ）を、ここでは雌ねじ孔１５ｃと雄ねじ部２１ｂとの径方向の隙間と定義する。上端ガイド部１５ｆと上部円筒部２１ｆとの径方向の隙間、及び下端ガイド部１５ｇと下部円筒部２１ｇとの径方向の隙間は、いずれも距離ΔＭａｘ未満である。 In FIG. 2, the radial distance Δ (ΔMax in FIG. 2) between the female threaded hole 15c and the male threaded portion 21b farthest from the female threaded hole 15c is defined as the radial gap between the female threaded hole 15c and the male threaded portion 21b. defined as A radial gap between the upper end guide portion 15f and the upper cylindrical portion 21f and a radial gap between the lower end guide portion 15g and the lower cylindrical portion 21g are both less than the distance ΔMax.

距離ΔＭａｘを持つ雌ねじ孔１５ｃと雄ねじ部２１ｂとの間の空間Ｓは、雄ねじ部２１ｂの周囲を螺旋状に延在して、上端ガイド部１５ｆと上部円筒部２１ｆとの間の隙間、及び下端ガイド部１５ｇと下部円筒部２１ｇとの間の隙間につながっている。 A space S between the female threaded hole 15c and the male threaded portion 21b having a distance ΔMax extends helically around the male threaded portion 21b to form a gap between the upper end guide portion 15f and the upper cylindrical portion 21f and the lower end It is connected to the gap between the guide portion 15g and the lower cylindrical portion 21g.

図１において、弁軸２１の端部２１ａに圧入により固定された閉弁方向用可動ストッパ３５が、端部２１ａと上部円筒部２１ｆとの間の段部に突き当てるようにして配設され、ロータ３０の上壁下面に係止されている。閉弁方向用可動ストッパ３５の下面には、断面矩形状のストッパ部３５ａが形成されている。 In FIG. 1, a valve closing direction movable stopper 35 fixed by press fitting to the end portion 21a of the valve shaft 21 is disposed so as to abut against a step portion between the end portion 21a and the upper cylindrical portion 21f, It is engaged with the lower surface of the upper wall of the rotor 30 . A stopper portion 35a having a rectangular cross section is formed on the lower surface of the movable stopper 35 for the valve closing direction.

また、弁軸２１の下部円筒部２１ｇの下端部には、鍔状部２１ｃの上面に突き当てるようにして、開弁方向用可動ストッパ３６が圧入により嵌合している。開弁方向用可動ストッパ３６の上面には、断面矩形状のストッパ部３６ａが形成されている。なお、開弁方向用可動ストッパ３６の内周に雌ねじを形成し、下部円筒部２１ｇの外周に雄ねじを形成し、これらねじ同士を螺合させることにより両者の固定を行ってもよい。 A valve-opening direction movable stopper 36 is press-fitted to the lower end of the lower cylindrical portion 21g of the valve shaft 21 so as to abut against the upper surface of the brim portion 21c. A stopper portion 36a having a rectangular cross section is formed on the upper surface of the movable stopper 36 for the valve opening direction. A female thread may be formed on the inner periphery of the valve-opening direction movable stopper 36, and a male thread may be formed on the outer periphery of the lower cylindrical portion 21g.

弁軸２１の下方において、弁ホルダ２３が、弁ホルダ２３の内側に摺動可能に嵌合して配設されている。弁ホルダ２３は、中空円筒部２３ａと、上壁２３ｂとを連設した有頂円筒形状を有している。上壁２３ｂの中央には、段付き開口２３ｃが形成されており、中空円筒部２３ａは連通穴２３ｄを有する。弁ホルダ２３の中空円筒部２３ａの開放した下端は、第２の配管Ｔ２より下方に配設され、カシメ固定された環状部材２７により閉止されている。 Below the valve shaft 21 , a valve holder 23 is slidably fitted inside the valve holder 23 . The valve holder 23 has a truncated cylindrical shape in which a hollow cylindrical portion 23a and an upper wall 23b are connected. A stepped opening 23c is formed in the center of the upper wall 23b, and the hollow cylindrical portion 23a has a communicating hole 23d. The open lower end of the hollow cylindrical portion 23a of the valve holder 23 is disposed below the second pipe T2 and closed by an annular member 27 which is crimped and fixed.

段付き開口２３ｃの段部に弁軸２１の鍔状部２１ｃが当接した状態で、下端連結部２１ｄが段付き開口２３ｃを貫通しており、この下端連結部２１ｄを拡径するようにカシメ加工することで、弁軸２１と弁ホルダ２３とが固定連結されている。弁本体１０と弁ホルダ２３との間に、弁室２９が画成される。 The lower end connecting portion 21d passes through the stepped opening 23c in a state where the flange portion 21c of the valve shaft 21 is in contact with the stepped portion of the stepped opening 23c. By processing, the valve shaft 21 and the valve holder 23 are fixedly connected. A valve chamber 29 is defined between the valve body 10 and the valve holder 23 .

環状部材２７を通して弁ホルダ２３から先端を突出させるようにして、ニードル弁２５が配置されている。ニードル弁２５は、弁鍔部２５ａと、円筒部２５ｂと、下方に向かうにしたがって縮径する円錐部２５ｃとを連設してなる。 A needle valve 25 is arranged such that its tip protrudes from the valve holder 23 through the annular member 27 . The needle valve 25 comprises a valve collar portion 25a, a cylindrical portion 25b, and a conical portion 25c whose diameter decreases downward.

弁鍔部２５ａの外径は、環状部材２７の内径より大きいため、弁ホルダ２３からニードル弁２５が脱落することが阻止される。弁鍔部２５ａと環状部材２７との間には、ワッシャ２８が配設されている。 Since the outer diameter of the valve collar portion 25 a is larger than the inner diameter of the annular member 27 , the needle valve 25 is prevented from falling off from the valve holder 23 . A washer 28 is arranged between the valve collar portion 25 a and the annular member 27 .

弁ホルダ２３の上壁２３ｂと、ニードル弁２５との間に、下端鍔部２６ａを有する円筒状のばね受け部材２６が配設されている。さらに上壁２３ｂと下端鍔部２６ａとの間には、コイルバネ２４が配設され、弁ホルダ２３に対してばね受け部材２６を下方に向かって付勢している。 Between the upper wall 23b of the valve holder 23 and the needle valve 25, a cylindrical spring receiving member 26 having a lower flange 26a is arranged. A coil spring 24 is arranged between the upper wall 23b and the lower flange 26a to urge the spring receiving member 26 downward against the valve holder 23. As shown in FIG.

円錐部２５ｃが弁座部材１１の弁座１１ｅに着座して、上方に向かう押圧力を受けたときに、ニードル弁２５により上向きに付勢されたばね受け部材２６が弁ホルダ２３の上壁２３ｂの下面（または下端連結部２１ｄ）に当接することで、ニードル弁２５は弁軸２１に対して軸線方向に係止される。 When the conical portion 25c is seated on the valve seat 11e of the valve seat member 11 and receives an upward pressing force, the spring receiving member 26 urged upward by the needle valve 25 is pushed upward by the upper wall 23b of the valve holder 23. The needle valve 25 is axially locked to the valve shaft 21 by contacting the lower surface (or the lower end connecting portion 21d).

上記した弁軸２１、弁ホルダ２３、ニードル弁２５、及びコイルバネ２４は、ニードル弁２５が弁座１１ｅから離隔している状態（開弁状態）においては、ガイドステム１５に対して実質的に一体的に回転しながら昇降する。 The valve shaft 21, the valve holder 23, the needle valve 25, and the coil spring 24 are substantially integrated with the guide stem 15 when the needle valve 25 is separated from the valve seat 11e (valve open state). ascends and descends while rotating.

（流量制御弁の動作）
流量制御弁１の動作を、具体的に説明する。
ここで、第２の配管Ｔ２から弁室２９内に冷媒（流体）が進入しているものとする。 (Operation of flow control valve)
The operation of the flow control valve 1 will be specifically described.
Here, it is assumed that refrigerant (fluid) is entering the valve chamber 29 from the second pipe T2.

外部の制御装置からステータ５０にパルス給電が行われることにより、ロータ３０及び弁軸２１が一方向に回転駆動され、雌ねじ孔１５ｃと雄ねじ部２１ｂからなるねじ送り機構により、弁軸２１及び閉弁方向用可動ストッパ３５が回転しながら下降し、ニードル弁２５が弁座１１ｅに着座してオリフィス１１ｄが閉止される。これにより、弁室２９から第１の配管Ｔ１側へ向かう冷媒の流れを遮断する。 By supplying pulse power to the stator 50 from an external control device, the rotor 30 and the valve shaft 21 are rotationally driven in one direction, and the valve shaft 21 and the valve are closed by a screw feed mechanism consisting of a female screw hole 15c and a male screw portion 21b. The directional movable stopper 35 descends while rotating, and the needle valve 25 is seated on the valve seat 11e to close the orifice 11d. This blocks the flow of refrigerant from the valve chamber 29 toward the first pipe T1.

この時点では、可動ストッパ３５は未だ固定ストッパ５５に当接しておらず、ロータ３０及び弁軸２１の回転下降は停止されず、コイルバネ２４が所定量圧縮されるまでパルス給電が継続される。それにより、ニードル弁２５が弁座１１ｅに着座したまま回転が制止される一方、ロータ３０、弁軸２１、弁ホルダ２３等はさらに回転しながら下降する。 At this time, the movable stopper 35 is not yet in contact with the fixed stopper 55, the rotor 30 and the valve shaft 21 do not stop rotating, and pulse power supply continues until the coil spring 24 is compressed by a predetermined amount. As a result, the rotation of the needle valve 25 is restrained while being seated on the valve seat 11e, while the rotor 30, the valve shaft 21, the valve holder 23, and the like further rotate and descend.

このとき、着座したニードル弁２５に対して弁軸２１及び弁ホルダ２３が下降するため、コイルバネ２４が縮長圧縮され、これにより弁軸２１及び弁ホルダ２３の下降力が吸収される。その後、コイルバネ２４の圧縮量が所定量となったとき、可動ストッパ３５が固定ストッパ５５に当接して係止され、ロータ３０及び弁軸２１が最下降位置に達し、ステータ５０に対しパルス給電が継続されてもロータ３０及び弁軸２１の下降は強制的に停止される。 At this time, since the valve shaft 21 and the valve holder 23 are lowered with respect to the seated needle valve 25 , the coil spring 24 is contracted and compressed, thereby absorbing the downward force of the valve shaft 21 and the valve holder 23 . After that, when the amount of compression of the coil spring 24 reaches a predetermined amount, the movable stopper 35 abuts against the fixed stopper 55 and is locked. Even if it continues, the descent of the rotor 30 and the valve shaft 21 is forcibly stopped.

このように、ニードル弁２５が弁座１１ｅに着座してオリフィス１１ｄが閉止された後においても、可動ストッパ３５が固定ストッパ５５に当接して係止される制御用原点位置に達するまでは、ロータ３０、弁軸２１、及び弁ホルダ２３の回転下降が継続されることにより、コイルバネ２４が圧縮される。そのため、コイルバネ２４の付勢力によりニードル弁２５が弁座１１ｅに強く押し付けられ、冷媒漏れ等を確実に防止できる。 In this manner, even after the needle valve 25 is seated on the valve seat 11e and the orifice 11d is closed, the rotor 10 is still maintained until the movable stopper 35 reaches the control origin position where the movable stopper 35 abuts against the fixed stopper 55 and is locked. 30, the valve stem 21, and the valve holder 23 continue to rotate downward, and the coil spring 24 is compressed. Therefore, the needle valve 25 is strongly pressed against the valve seat 11e by the urging force of the coil spring 24, thereby reliably preventing refrigerant leakage and the like.

一方、上記制御用原点位置からステータ５０に、逆極性のパルス給電を行うと、ロータ３０及び弁軸２１が閉弁時とは逆方向に回転駆動され、雌ねじ孔１５ｃと雄ねじ部２１ｂ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。これに伴い、ニードル弁２５に対する押圧力が弱められ、コイルバネ２４が伸張して、ニードル弁２５が弁座１１ｅから離れると、オリフィス１１ｄが開放される。これにより、第２の配管Ｔ２から弁室２９内へと進入した冷媒は、円錐部２５ｃと弁座１１ｅ他との間の隙間を通過して、オリフィス１１ｄを通って第１の配管Ｔ１へと流れる。 On the other hand, when a reverse polarity pulse power supply is applied to the stator 50 from the control origin position, the rotor 30 and the valve shaft 21 are driven to rotate in the direction opposite to that when the valve is closed, and the screw formed by the female screw hole 15c and the male screw portion 21b is rotated. The feed mechanism raises the rotor 30, the valve shaft 21, the valve holder 23, and the valve opening direction movable stopper 36 while rotating. As a result, the pressing force applied to the needle valve 25 is weakened, the coil spring 24 expands, and when the needle valve 25 is separated from the valve seat 11e, the orifice 11d is opened. As a result, the refrigerant that has entered the valve chamber 29 from the second pipe T2 passes through the gap between the conical portion 25c and the valve seat 11e, etc., and passes through the orifice 11d to the first pipe T1. flow.

この場合、ステータ５０へのパルス給電に応じてニードル弁２５のリフト量が定まるため、冷媒の流量制御を行える。さらにパルス給電を続けることで、最終的にニードル弁２５が全開状態となる。さらにパルス給電が継続された場合、可動ストッパ３６が開弁方向用固定ストッパ５６に当接して係止され、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。 In this case, since the lift amount of the needle valve 25 is determined according to the pulse power supply to the stator 50, the refrigerant flow rate can be controlled. By continuing the pulse power supply, the needle valve 25 is finally fully opened. When the pulse power supply continues, the movable stopper 36 abuts against the valve-opening direction fixed stopper 56 and is locked, thereby forcibly rotating and lifting the rotor 30, the valve shaft 21, and the valve holder 23. be stopped.

次に、比較例となる弁本体を参照して、本実施形態の流量制御弁１の作用効果について説明する。図３は、比較例にかかる流量制御弁１Ａを示す縦断面図であるが、ステータは省略している。
比較例においては、上記実施形態に対して弁軸２１Ａ，ガイドステム１５Ａ，閉弁方向用可動ストッパ３５Ａ、開弁方向用可動ストッパ３６Ａの形状が異なる。それ以外の共通する構成については、同じ符号を付して重複説明を省略する。 Next, the effects of the flow control valve 1 of this embodiment will be described with reference to a valve main body as a comparative example. FIG. 3 is a longitudinal sectional view showing a flow control valve 1A according to a comparative example, but the stator is omitted.
In the comparative example, the shapes of the valve shaft 21A, the guide stem 15A, the valve closing direction movable stopper 35A, and the valve opening direction movable stopper 36A are different from those of the above embodiment. Other common configurations are denoted by the same reference numerals, and overlapping descriptions are omitted.

図３において、弁軸２１Ａは、雄ねじ部２１Ａｂの両側に上端円筒部と下端円筒部を有しておらず、またガイドステム１５Ａは、上端ガイド部と下端ガイド部を有しておらず、本体１５Ａａを貫通して、雌ねじ孔１５Ａｃが形成されている。雄ねじ部２１Ａｂは、雌ねじ孔１５Ａｃの両端から突き出て、キャン４５内の空間に露出しており、閉弁方向用可動ストッパ３５Ａ、開弁方向用可動ストッパ３６Ａは、露出した雄ねじ部２１Ａｂに螺合している。 In FIG. 3, the valve shaft 21A does not have an upper end cylindrical portion and a lower end cylindrical portion on both sides of the male thread portion 21Ab, and the guide stem 15A does not have an upper end guide portion and a lower end guide portion. A female screw hole 15Ac is formed through 15Aa. The male threaded portion 21Ab protrudes from both ends of the female threaded hole 15Ac and is exposed in the space inside the can 45. The valve closing direction movable stopper 35A and the valve opening direction movable stopper 36A are screwed into the exposed male threaded portion 21Ab. is doing.

流量制御弁１Ａにおいて、第２の配管Ｔ２から弁室２９内に進入した冷媒は、鍔状円盤１８の貫通孔１８ａを介して、弁本体１０側からキャン４５側に流れる。冷媒の一部は均圧穴１５Ａｄを介してガイドステム１５Ａの中空円筒部１５Ａｂ内に向かい、残りの冷媒は、ロータ３０と本体１５Ａａとの間を通過して、弁軸２１Ａの上部に至る。ここで、冷媒内に混入する金属粉などの異物は、冷媒と共にキャン４５の内部へと移動する。 In the flow control valve 1A, the refrigerant entering the valve chamber 29 from the second pipe T2 flows through the through hole 18a of the brim-shaped disk 18 from the valve main body 10 side to the can 45 side. Part of the refrigerant flows through the pressure equalizing hole 15Ad into the hollow cylindrical portion 15Ab of the guide stem 15A, and the rest of the refrigerant passes between the rotor 30 and the main body 15Aa and reaches the top of the valve shaft 21A. Here, foreign matter such as metal powder mixed in the coolant moves into the can 45 together with the coolant.

図３に示す流量制御弁１Ａにおいては、雄ねじ部２１Ａｂは、雌ねじ孔１５Ａｃの両端から露出するように突き出ているため、キャン４５の内部へと移動した異物がねじ表面に付着する場合がある。かかる場合、弁軸２１Ａの移動に伴って、異物が雌ねじ孔１５Ａｃ内へと引き込まれ、雄ねじ部２１Ａｂと雌ねじ孔１５Ａｃとの間で噛み込まれるおそれがある。この異物の噛み込みにより、弁軸２１Ａとガイドステム１５Ａとの円滑な相対移動が阻害されることが懸念される。 In the flow control valve 1A shown in FIG. 3, the male threaded portion 21Ab protrudes so as to be exposed from both ends of the female threaded hole 15Ac. In such a case, foreign matter may be drawn into the female threaded hole 15Ac as the valve stem 21A moves, and may be caught between the male threaded portion 21Ab and the female threaded hole 15Ac. It is feared that smooth relative movement between the valve shaft 21A and the guide stem 15A may be hindered by this foreign matter being caught.

これに対し、図１に示す本実施形態の流量制御弁１によれば、弁軸２１の雄ねじ部２１ｂが、ガイドステム１５の雌ねじ孔１５ｃの両側から露出していない。より具体的には、弁軸２１の雄ねじ部２１ｂの上側に、上部円筒部２１ｆが上端ガイド部１５ｆに対向して形成され、またその下側に、下部円筒部２１ｇが下端ガイド部１５ｇに対向して形成されている。さらに、上端ガイド部１５ｆと上部円筒部２１ｆとの径方向の隙間、及び下端ガイド部１５ｇと下部円筒部２１ｇとの径方向の隙間は、雌ねじ孔１５ｃと雄ねじ部２１ｂとの径方向の隙間(距離ΔＭａｘ）より小さくなっている。 On the other hand, according to the flow control valve 1 of this embodiment shown in FIG. More specifically, an upper cylindrical portion 21f is formed on the upper side of the male thread portion 21b of the valve shaft 21 so as to face the upper end guide portion 15f, and a lower cylindrical portion 21g is formed on the lower side thereof and faces the lower end guide portion 15g. It is formed by Furthermore, the radial gap between the upper end guide portion 15f and the upper cylindrical portion 21f and the radial gap between the lower end guide portion 15g and the lower cylindrical portion 21g are the radial gap ( distance ΔMax).

このため、比較的大きな異物は、上端ガイド部１５ｆと上部円筒部２１ｆとの隙間、または下端ガイド部１５ｇと下部円筒部２１ｇとの隙間を通過できず、雌ねじ孔１５ｃと雄ねじ部２１ｂとの間に進入できないため、異物の噛み込みが生じることがない。 For this reason, relatively large foreign matter cannot pass through the gap between the upper end guide portion 15f and the upper cylindrical portion 21f or the gap between the lower end guide portion 15g and the lower cylindrical portion 21g. can not enter, foreign matter will not be caught.

一方、比較的小さな異物は、上端ガイド部１５ｆと上部円筒部２１ｆとの隙間、または下端ガイド部１５ｇと下部円筒部２１ｇとの隙間を通過して、雌ねじ孔１５ｃと雄ねじ部２１ｂとの間に進入する可能性がある。しかしながら、このような異物は、距離Δ（ΔＭａｘ）より小さな寸法を有することとなるため、図２に示す螺旋状の空間Ｓにとどまり、雌ねじ孔１５ｃと雄ねじ部２１ｂとの間で噛み込まれるおそれは少ない。 On the other hand, relatively small foreign matter passes through the gap between the upper end guide portion 15f and the upper cylindrical portion 21f or the gap between the lower end guide portion 15g and the lower cylindrical portion 21g, and passes between the female threaded hole 15c and the male threaded portion 21b. may enter. However, since such a foreign matter has a dimension smaller than the distance Δ (ΔMax), it remains in the spiral space S shown in FIG. it is less.

ここで、距離Δと異物のサイズについてさらに説明する。図２に示すように、雄ねじ部２１ｂは雌ねじ孔１５ｃに対して径方向に移動できるため距離Δは変動する。雌ねじ孔１５ｃに対して雄ねじ部２１ｂが径方向に最も近接した実線位置の距離ΔをΔＭｉｎとし、雌ねじ孔１５ｃに対して雄ねじ部２１ｂが径方向に最も離間した点線位置の距離ΔをΔＭａｘとし、ΔＭｉｎとΔＭａｘの中間距離となる隙間をΔＭｉｄ（＝（ΔＭｉｎ＋ΔＭａｘ）／２）とする。この場合、異物が隙間ΔＭｉｄのときに形成される空間Ｓに収まるサイズであれば、異物が空間Ｓに留まった状態でも、雄ねじ部２１ｂは雌ねじ孔１５ｃの中心軸と同軸で回転できるため摺動に悪影響を与えない。つまり、雌ねじ孔１５ｃと雄ねじ部２１ｂの間への異物の噛み込みは抑制される。すなわち、ガイド部と円筒部（上部円筒部、下部円筒部）との径方向の隙間は、雌ねじ孔１５ｃと雄ねじ部２１ｂとの径方向の隙間ΔＭｉｄより小さいことが望ましい。 Here, the distance Δ and the size of the foreign matter will be further explained. As shown in FIG. 2, the distance Δ varies because the male threaded portion 21b can move radially with respect to the female threaded hole 15c. The distance Δ of the solid line position where the male threaded portion 21b is radially closest to the female threaded hole 15c is ΔMin, the distance Δ of the dotted line position where the male threaded portion 21b is radially most distant from the female threaded hole 15c is ΔMax, Let ΔMid (=(ΔMin+ΔMax)/2) be the intermediate distance between ΔMin and ΔMax. In this case, if the foreign matter is of a size that fits in the space S formed when the gap ΔMid is formed, even if the foreign matter stays in the space S, the male threaded portion 21b can rotate coaxially with the central axis of the female threaded hole 15c. does not adversely affect That is, foreign matter is prevented from getting caught between the female threaded hole 15c and the male threaded portion 21b. That is, the radial gap between the guide portion and the cylindrical portion (upper cylindrical portion, lower cylindrical portion) is preferably smaller than the radial gap ΔMid between the female threaded hole 15c and the male threaded portion 21b.

なお、異物がΔＭｉｄのときに形成される空間Ｓに収まらないサイズであっても、ΔＭａｘのときに形成される空間Ｓに収まるサイズであれば、異物は空間Ｓに留まるため、雌ねじ孔１５ｃと雄ねじ部２１ｂの間に異物が噛み込んでねじの回転がロックするおそれを低減できる。すなわち、ガイド部と円筒部（上部円筒部、下部円筒部）との径方向の隙間は、雌ねじ孔１５ｃと雄ねじ部２１ｂとの径方向の隙間（距離ΔＭａｘ）より小さければ本発明の効果を発揮できる。 Note that even if the size of the foreign matter does not fit in the space S formed at ΔMid, if the foreign matter has a size that fits in the space S formed at ΔMax, the foreign matter stays in the space S. It is possible to reduce the risk of locking the rotation of the screw due to foreign matter getting caught between the male screw portions 21b. That is, if the radial gap between the guide portion and the cylindrical portion (upper cylindrical portion, lower cylindrical portion) is smaller than the radial gap (distance ΔMax) between the female threaded hole 15c and the male threaded portion 21b, the effect of the present invention is exhibited. can.

キャン４５内の冷媒は、流量制御弁１の動作により弁室２９へと循環し、第１の配管Ｔ１を介して流量制御弁１の外部へと排出されるため、それにより冷媒中の異物もキャン４５内に留まることがなく、異物除去のためにキャン４５内を定期的に清掃する必要もない。すなわち、本実施形態によれば、コストやメンテナンスの手間を抑制しつつ、円滑な動作を確保できる流量制御弁１を提供することができる。 Refrigerant in the can 45 is circulated to the valve chamber 29 by the operation of the flow control valve 1 and discharged to the outside of the flow control valve 1 through the first pipe T1. It does not remain in the can 45, and there is no need to periodically clean the inside of the can 45 to remove foreign matter. That is, according to the present embodiment, it is possible to provide the flow control valve 1 capable of ensuring smooth operation while reducing cost and maintenance effort.

１ 流量制御弁
１０ 弁本体
１１ 弁座部材
１１ｅ 弁座
１５ ガイドステム
２１ 弁軸
２３ 弁ホルダ
２４ コイルバネ
２５ ニードル弁
２６ ばね受け部材
２７ 環状部材
２９ 弁室
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
５０ ステータ
５３ ステータコイル
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 flow control valve 10 valve main body 11 valve seat member 11e valve seat 15 guide stem 21 valve shaft 23 valve holder 24 coil spring 25 needle valve 26 spring bearing member 27 annular member 29 valve chamber 30 rotor 35 movable stopper 36 for valve closing direction valve opening directional movable stopper 50 stator 53 stator coil 55 valve closing direction fixed stopper 56 valve opening direction fixed stopper

Claims (6)

キャンと、
前記キャンに接合される弁本体と、
前記キャンと前記弁本体とで囲われた空間内に配置され、前記弁本体に対して回転可能な弁軸と、前記弁本体に対して固定されたガイドステムと、を有し、
前記弁軸は、一体の部材から構成され、雄ねじ部、前記雄ねじ部の上側に配置された上部円筒部、及び前記雄ねじ部の下側に配置された下部円筒部を有し、
前記ガイドステムは、前記雄ねじ部に螺合する雌ねじ孔、前記雌ねじ孔の上側に配置され、前記上部円筒部に対向する上端ガイド部、及び前記雌ねじ孔の下側に配置され、前記下部円筒部に対向する下端ガイド部を有し、
前記上端ガイド部と前記上部円筒部との径方向の隙間、及び前記下端ガイド部と前記下部円筒部との径方向の隙間はいずれも、前記雌ねじ孔と前記雄ねじ部との径方向の隙間より小さい、
ことを特徴とする流量制御弁。 Can and
a valve body joined to the can;
Having a valve shaft arranged in a space surrounded by the can and the valve body and rotatable with respect to the valve body, and a guide stem fixed with respect to the valve body,
The valve stem is composed of an integral member and has a male threaded portion, an upper cylindrical portion arranged above the male threaded portion, and a lower cylindrical portion arranged below the male threaded portion ,
The guide stem includes a female threaded hole that is screwed into the male threaded portion, an upper end guide portion that is arranged above the female threaded hole and faces the upper cylindrical portion, and a lower cylindrical portion that is arranged below the female threaded hole. has a lower end guide portion facing the
Both the radial clearance between the upper end guide portion and the upper cylindrical portion and the radial clearance between the lower end guide portion and the lower cylindrical portion are larger than the radial clearance between the female threaded hole and the male threaded portion. small,
A flow control valve characterized by: 少なくとも一方の前記ガイド部の内径は、前記雄ねじ部のねじ山外径より大きい、
ことを特徴とする請求項１に記載の流量制御弁。 The inner diameter of at least one of the guide portions is larger than the thread outer diameter of the male threaded portion,
The flow control valve according to claim 1, characterized in that: 前記上端ガイド部の内径は、前記下端ガイド部の内径より小さい、
ことを特徴とする請求項２に記載の流量制御弁。 The inner diameter of the upper end guide portion is smaller than the inner diameter of the lower end guide portion,
3. The flow control valve according to claim 2, characterized in that: 前記弁軸には、前記上部円筒部に隣接して可動ストッパが圧入または螺合により固定されており、
前記ガイドステムは、前記弁軸が所定量回転したときに、前記可動ストッパに当接する固定ストッパを有する、
ことを特徴とする請求項１～３のいずれか一項に記載の流量制御弁。 A movable stopper is fixed to the valve shaft by press fitting or screwing adjacent to the upper cylindrical portion ,
The guide stem has a fixed stopper that contacts the movable stopper when the valve shaft rotates by a predetermined amount.
The flow control valve according to any one of claims 1 to 3, characterized in that: 前記弁軸は金属製であり、前記ガイドステムは樹脂製である、
ことを特徴とする請求項１～４のいずれか一項に記載の流量制御弁。 The valve stem is made of metal, and the guide stem is made of resin.
The flow control valve according to any one of claims 1 to 4, characterized in that: 前記弁軸に対し一体的に回動可能に連結固定されたロータと、前記キャンの外周に外嵌されたステータと、をさらに備え、
前記ロータと前記ステータとを有してステッピングモータが構成されることを特徴とする請求項１～５のいずれか一項に記載の流量制御弁。 further comprising: a rotor integrally rotatably connected and fixed to the valve shaft; and a stator fitted around the outer circumference of the can,
The flow control valve according to any one of claims 1 to 5, wherein the rotor and the stator constitute a stepping motor.
JP2021001330A 2021-01-07 2021-01-07 flow control valve Active JP7175035B2 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019138387A (en) 2018-02-13 2019-08-22 株式会社鷺宮製作所 Motor valve and refrigeration cycle system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019138387A (en) 2018-02-13 2019-08-22 株式会社鷺宮製作所 Motor valve and refrigeration cycle system

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