JP6903453B2 - Electric valve and refrigeration cycle system - Google Patents

Electric valve and refrigeration cycle system Download PDF

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JP6903453B2
JP6903453B2 JP2017045866A JP2017045866A JP6903453B2 JP 6903453 B2 JP6903453 B2 JP 6903453B2 JP 2017045866 A JP2017045866 A JP 2017045866A JP 2017045866 A JP2017045866 A JP 2017045866A JP 6903453 B2 JP6903453 B2 JP 6903453B2
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valve
pipe joint
valve body
electric valve
electric
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JP2018150959A (en
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大樹 中川
大樹 中川
一也 小林
一也 小林
拓也 松尾
拓也 松尾
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Saginomiya Seisakusho Inc
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Saginomiya Seisakusho Inc
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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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
    • 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
    • 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)
  • Details Of Valves (AREA)

Description

本発明は、電動弁、および該電動弁を用いた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 using the electric valve.

従来より、図５に示すような構造を有する電動弁が知られている（たとえば、特許文献１参照）。すなわち、ステッピングモータが駆動してロータ１０３が回転すると、雌ネジ１３１ａと雄ネジ１２１ａのネジ送り作用により、弁体１１４が中心軸Ｌ方向に移動する。これにより、弁ポート１３０ｂの開度調整がなされ、管継手１１１から流入して管継手１１２から流出する流体の流量、または、管継手１１2から流入して管継手１１１から流出する流体の流量が制御される。 Conventionally, an electric valve having a structure as shown in FIG. 5 has been known (see, for example, Patent Document 1). That is, when the stepping motor is driven and the rotor 103 is rotated, the valve body 114 moves in the central axis L direction due to the screw feeding action of the female screw 131a and the male screw 121a. As a result, the opening degree of the valve port 130b is adjusted, and the flow rate of the fluid flowing in from the pipe joint 111 and flowing out from the pipe joint 112 or the flow rate of the fluid flowing in from the pipe joint 112 and flowing out from the pipe joint 111 is controlled. Will be done.

ここで、各種流体の流量制御を行うにあたっては、流体通過音が発生するという問題があるため、静音化が要求される。また、冷媒を用いた家庭用空調機や業務用空調機の冷凍サイクルの室内機において、電動弁１００にて冷媒流量を制御する場合は、弁ポート１３０ｂ通過前後で液冷媒が気液混合二相流となるため、特に、多彩な冷媒状態、運転状況でも静音性を発揮することが要求される。 Here, when controlling the flow rate of various fluids, there is a problem that fluid passing noise is generated, so that noise reduction is required. Further, in the indoor unit of the refrigeration cycle of a household air conditioner or a commercial air conditioner using a refrigerant, when the refrigerant flow rate is controlled by the electric valve 100, the liquid refrigerant is a gas-liquid mixed two-phase before and after passing through the valve port 130b. Since it becomes a flow, it is required to exhibit quietness even in various refrigerant states and operating conditions.

特開２０１６−０８９８７０号公報Japanese Unexamined Patent Publication No. 2016-0898770

ところで、上述の電動弁１００は、図示しない流体配管に管継手１１１、管継手１１２を介して固定されており、流路内に弁体１１４と弁座１３０の弁ポート１３０ｂが露出している。このため、電動弁１００において、弁ポート１３０ｂの入り口側と出口側の間に高い圧力差が生じた場合などで、特に管継手１１１から管継手１１２に流れる場合には、図６に示すように、管継手１１１から流入した冷媒などの流体が弁体１１４に当たり、その衝突力によって弁体１１４が径方向（Ｃ）に振動することがある。この振動による音が発生すると、電動弁１００の静音性を維持できなくなる場合がある。 By the way, the above-mentioned electric valve 100 is fixed to a fluid pipe (not shown) via a pipe joint 111 and a pipe joint 112, and the valve body 114 and the valve port 130b of the valve seat 130 are exposed in the flow path. Therefore, in the electric valve 100, when a high pressure difference occurs between the inlet side and the outlet side of the valve port 130b, particularly when the fluid flows from the pipe joint 111 to the pipe joint 112, as shown in FIG. , A fluid such as a refrigerant flowing in from the pipe joint 111 may hit the valve body 114, and the valve body 114 may vibrate in the radial direction (C) due to the collision force. When the sound generated by this vibration is generated, the quietness of the electric valve 100 may not be maintained.

ここで、図７に示すように、弁座１３０の天面１３０ａの位置を高くすることにより、管継手１１１から弁室１２１に流入する流体が直接弁体１１４に当たらない構造にすることが考えられる。しかしこの場合、弁体１１４に当たった流体のほとんどが上向きに流れるため、弁体１１４に上向きの力が加わり、弁体１１４が上下方向（Ｅ）に振動してしまう。したがって、この場合もまた、静音性を維持することが困難になる。 Here, as shown in FIG. 7, it is conceivable to raise the position of the top surface 130a of the valve seat 130 so that the fluid flowing from the pipe joint 111 into the valve chamber 121 does not directly hit the valve body 114. Be done. However, in this case, since most of the fluid that hits the valve body 114 flows upward, an upward force is applied to the valve body 114, and the valve body 114 vibrates in the vertical direction (E). Therefore, in this case as well, it becomes difficult to maintain quietness.

本発明の目的は、的確に静音性を維持することができる電動弁、および該電動弁を用いた冷凍サイクルシステムを提供することである。 An object of the present invention is to provide an electric valve capable of accurately maintaining quietness, and a refrigeration cycle system using the electric valve.

本発明の電動弁は、
ケースの内周に収容されたロータの回転運動を、雄ネジ部材と雌ネジ部材とのネジ螺合により直線運動に変換し、この直線運動に基づいて弁本体内に収容された弁体を軸方向に移動させる電動弁であって、
前記弁本体の側面に装着された第１管継手と、
前記弁体が近接または離間可能な弁ポートが開口された平坦な天面を有する弁座部材と、
前記弁ポートを介して前記第１管継手と連通する第２管継手とを備え、
前記弁体は、その外径部分が前記弁ポートよりも大きく、かつ先端部分と前記外径部分の間に環状の平面が形成され、
前記弁座部材の前記天面の前記軸方向における位置が、前記第１管継手の中心軸よりも前記ロータ側において、前記第１管継手の内径の最上端を超えない高さに位置し、
前記雌ネジ部材の下端が前記第１管継手の外径の最上端よりも前記ロータ側にあり、かつ前記雌ネジ部材の張出部分の下面と前記第１管継手の外径の最上端の間の寸法が、前記第１管継手の内径よりも大きく、
前記弁本体内の弁室には、前記軸方向において前記第１管継手よりも前記ロータ側に形成された第１空間と、前記軸方向において前記第１管継手よりも前記第２管継手側に形成された第２空間とが含まれ、
前記第１管継手は、前記第２空間の深さが前記第１管継手の内径の半径よりも深くなるように取付けられていることを特徴とする。 The electric valve of the present invention
The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by screwing the male screw member and the female screw member, and based on this linear motion, the valve body housed in the valve body is used as an axis. An electric valve that moves in the direction
The first pipe joint mounted on the side surface of the valve body and
A valve seat member having a flat top surface with an open valve port from which the valve body can be brought close to or separated from each other.
A second pipe joint that communicates with the first pipe joint via the valve port is provided.
The valve body has an outer diameter portion larger than that of the valve port, and an annular flat surface is formed between the tip portion and the outer diameter portion.
The position of the top surface of the valve seat member in the axial direction is located on the rotor side of the central axis of the first pipe joint at a height not exceeding the uppermost end of the inner diameter of the first pipe joint.
The lower end of the female screw member is on the rotor side of the uppermost end of the outer diameter of the first pipe joint, and the lower surface of the overhanging portion of the female screw member and the uppermost end of the outer diameter of the first pipe joint. The dimension between them is larger than the inner diameter of the first pipe joint.
In the valve chamber in the valve body, a first space formed on the rotor side of the first pipe joint in the axial direction and a second pipe joint side of the first pipe joint in the axial direction. contains a second space formed,
The first pipe joint is characterized in that the depth of the second space is deeper than the radius of the inner diameter of the first pipe joint .

これによれば、弁座部材の天面の位置を高くすることにより、第１管継手から流入した流体を直接弁体に衝突させないようにすることができ、弁体の径方向の振動を抑制することができる。また、弁本体内において、第１空間の他に第２空間を設けることにより、第１管継手から流入した流体のすべてが上方に流れて弁体に上向きの力が加わり、弁体が軸方向に振動することを抑制することができる。このように、弁体に対する負荷を軽減することにより、弁体の径方向軸方向の振動を低減させ、的確に電動弁の静音性を維持することができる。
また、第１管継手から流入した流体を的確に上下に振り分け、第１空間、第２空間に導くことができる。 According to this, by raising the position of the top surface of the valve seat member, it is possible to prevent the fluid flowing in from the first pipe joint from directly colliding with the valve body, and suppress the vibration in the radial direction of the valve body. can do. Further, by providing the second space in addition to the first space in the valve body, all the fluid flowing in from the first pipe joint flows upward and an upward force is applied to the valve body, so that the valve body moves in the axial direction. It is possible to suppress the vibration. By reducing the load on the valve body in this way, it is possible to reduce the vibration in the radial axis direction of the valve body and accurately maintain the quietness of the electric valve.
In addition, the fluid flowing in from the first pipe joint can be accurately distributed up and down and guided to the first space and the second space.

また、本発明の電動弁は、
前記弁本体の内径が、前記第１管継手の内径よりも大きいことを特徴とする。
これにより、流体の逃げ場を的確に確保することができる。 Further, the electric valve of the present invention is
The inner diameter of the valve body is larger than the inner diameter of the first pipe joint.
As a result, it is possible to accurately secure an escape place for the fluid.

また、本発明の電動弁は、
前記第１管継手の外径最下端が、前記弁本体の内部底面よりも前記ロータ側に配置されていることを特徴とする。
これにより、第１管継手から流入した流体の上方への流れをより的確に抑制することができる。

Further, the electric valve of the present invention is
The lowermost end of the outer diameter of the first pipe joint is arranged on the rotor side of the inner bottom surface of the valve body.
Thus, Ru can flow into upper fluid flowing from the first fitting more accurately suppressed.

また、本発明の冷凍サイクルシステムは、
圧縮機、凝縮器、膨張弁、および蒸発器を含む冷凍サイクルシステムであって、上述の電動弁を前記膨張弁として用いることを特徴とする。 Further, the refrigeration cycle system of the present invention is
A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, characterized in that the above-mentioned electric valve is used as the expansion valve.

本発明に係る発明によれば、的確に静音性を維持することができる電動弁、および該電動弁を用いた冷凍サイクルシステムを提供することができる。 According to the invention according to the present invention, it is possible to provide an electric valve capable of accurately maintaining quietness and a refrigeration cycle system using the electric valve.

実施の形態に係る電動弁の概略断面図である。It is the schematic sectional drawing of the electric valve which concerns on embodiment. 実施の形態に係る電動弁の要部拡大図である。It is an enlarged view of the main part of the electric valve which concerns on embodiment. 実施の形態に係る電動弁の要部の側面図である。It is a side view of the main part of the electric valve which concerns on embodiment. 実施の形態に係る電動弁に接続された第１の管継手の内部から視認される弁座部材の天面を示す図である。It is a figure which shows the top surface of the valve seat member which is visible from the inside of the 1st pipe joint connected to the electric valve which concerns on embodiment. 従来の電動弁の概略断面図である。It is the schematic sectional drawing of the conventional electric valve. 従来の電動弁の要部拡大図である。It is an enlarged view of the main part of a conventional electric valve. 比較例としての電動弁の要部拡大図である。It is an enlarged view of the main part of the electric valve as a comparative example.

以下、図面を参照して、本発明の実施の形態に係る電動弁について説明する。図１は、実施の形態に係る電動弁２を示した概略断面図である。なお、本明細書において、「上」あるいは「下」とは図１の状態で規定したものである。すなわち、ロータ４は弁体１７より上方に位置している。 Hereinafter, the electric valve according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the electric valve 2 according to the embodiment. In addition, in this specification, "upper" or "lower" is defined in the state of FIG. That is, the rotor 4 is located above the valve body 17.

この電動弁２では、金属により筒状のカップ形状をなすケース６０の開口側の下方に、弁本体３０が溶接などにより一体的に接続されている。
ここで、弁本体３０は、たとえばステンレス等の金属から成り、内部に弁室１１を有している。また、弁本体３０には、弁室１１に直接連通するたとえばステンレス製や銅製の第１管継手１２が固定装着されている。さらに、弁本体３０の底面には、断面円形の弁ポート１６ａが形成された弁座部材１６が組み込まれている。弁座部材１６には、弁ポート１６ａ、弁室１１を介して第１管継手１２に連通するたとえばステンレス製や銅製の第２管継手１５が固定装着されている。 In the electric valve 2, the valve body 30 is integrally connected to the lower side of the opening side of the case 60 having a tubular cup shape made of metal by welding or the like.
Here, the valve body 30 is made of a metal such as stainless steel, and has a valve chamber 11 inside. Further, the valve body 30 is fixedly fitted with a first pipe joint 12 made of, for example, stainless steel or copper, which directly communicates with the valve chamber 11. Further, a valve seat member 16 having a valve port 16a having a circular cross section is incorporated in the bottom surface of the valve body 30. A second pipe joint 15 made of, for example, stainless steel or copper, which communicates with the first pipe joint 12 via the valve port 16a and the valve chamber 11, is fixedly mounted on the valve seat member 16.

ケース６０の内周には、回転可能なロータ４が収容され、ロータ４の軸芯部分には、ブッシュ部材３３を介して弁軸４１が配置されている。なお、ロータ４は、磁性粉を含有する樹脂材料やフェライト磁石等の磁性を有する素材で形成されている。ブッシュ部材３３と弁軸４１は、共にたとえばステンレス等の金属で形成されており、ブッシュ部材３３で結合された弁軸４１とロータ４とは、回転しながら上下方向に一体的に移動する。なお、この弁軸４１の中間部付近の外周面には雄ネジ４１ａが形成されている。本実施の形態では、弁軸４１が雄ネジ部材として機能している。また、弁体１７は弁ポート１６ａに対して近接又は離間可能となっている。 A rotatable rotor 4 is housed in the inner circumference of the case 60, and a valve shaft 41 is arranged at a shaft core portion of the rotor 4 via a bush member 33. The rotor 4 is made of a magnetic material such as a resin material containing magnetic powder or a ferrite magnet. Both the bush member 33 and the valve shaft 41 are made of a metal such as stainless steel, and the valve shaft 41 and the rotor 4 connected by the bush member 33 move integrally in the vertical direction while rotating. A male screw 41a is formed on the outer peripheral surface of the valve shaft 41 near the middle portion. In this embodiment, the valve shaft 41 functions as a male screw member. Further, the valve body 17 can be brought close to or separated from the valve port 16a.

ケース６０の外周には、図示しないヨーク、ボビン、およびコイルなどからなるステータが配置され、ロータ４とステータとでステッピングモータが構成されている。
弁軸４１のブッシュ部材３３より下方には、後述するように弁軸４１との間でネジ送り機構Ａを構成するとともに弁軸４１の傾きを抑制する機能を有する弁軸ホルダ６が、弁本体３０に対して相対的に回転不能に固定されている。 A stator composed of a yoke, a bobbin, a coil, and the like (not shown) is arranged on the outer periphery of the case 60, and a stepping motor is configured by the rotor 4 and the stator.
Below the bush member 33 of the valve shaft 41, a valve shaft holder 6 having a function of forming a screw feed mechanism A with the valve shaft 41 and suppressing the inclination of the valve shaft 41 is provided as a valve body. It is fixed so that it cannot rotate relative to 30.

この弁軸ホルダ６は、上部側の筒状小径部６ａと下部側の筒状大径部６ｂと弁本体３０の内周部側に収容される嵌合部６ｃとリング状のフランジ部６ｆとからなる。そして、弁軸ホルダ６のフランジ部６ｆは、弁本体３０の上端に溶接などで固定されている。また、弁軸ホルダ６の内部には、後述する弁ガイド１８を収容する収容室６ｈが形成されている。なお、弁軸ホルダ６は、金属のフランジ部６ｆ以外が樹脂材料で形成されている。 The valve shaft holder 6 includes a tubular small diameter portion 6a on the upper side, a tubular large diameter portion 6b on the lower side, a fitting portion 6c accommodated on the inner peripheral portion side of the valve body 30, and a ring-shaped flange portion 6f. Consists of. The flange portion 6f of the valve shaft holder 6 is fixed to the upper end of the valve body 30 by welding or the like. Further, inside the valve shaft holder 6, a storage chamber 6h for accommodating a valve guide 18 described later is formed. The valve shaft holder 6 is made of a resin material except for the metal flange portion 6f.

また、この弁軸ホルダ６の筒状小径部６ａの上部開口部６ｇから所定の深さまで下方に向かって雌ネジ６ｄが形成されている。このため、本実施の形態では、弁軸ホルダ６が雌ネジ部材として機能している。そして、弁軸４１の外周に形成された雄ネジ４１ａと、弁軸ホルダ６の筒状小径部６ａの内周に形成された雌ネジ６ｄとにより、ネジ送り機構Ａが構成されている。 Further, a female screw 6d is formed downward from the upper opening 6g of the tubular small diameter portion 6a of the valve shaft holder 6 to a predetermined depth. Therefore, in the present embodiment, the valve shaft holder 6 functions as a female screw member. The screw feed mechanism A is composed of a male screw 41a formed on the outer circumference of the valve shaft 41 and a female screw 6d formed on the inner circumference of the tubular small diameter portion 6a of the valve shaft holder 6.

さらに、弁軸ホルダ６の筒状大径部６ｂの側面には、均圧孔５１が穿設され、この均圧孔５１により、筒状大径部６ｂ内の弁軸ホルダ室８３と、ロータ収容室６７（第２の背圧室）との間が連通している。このように均圧孔５１を設けることにより、ケース６０のロータ４を収容する空間と、弁軸ホルダ６内の空間とを連通することにより、弁体１７の移動動作をスムーズに行うことができる。 Further, a pressure equalizing hole 51 is formed on the side surface of the tubular large diameter portion 6b of the valve shaft holder 6, and the pressure equalizing hole 51 allows the valve shaft holder chamber 83 in the tubular large diameter portion 6b and the rotor. It communicates with the containment chamber 67 (second back pressure chamber). By providing the pressure equalizing hole 51 in this way, the space for accommodating the rotor 4 of the case 60 and the space inside the valve shaft holder 6 are communicated with each other, so that the valve body 17 can be smoothly moved. ..

また、弁軸４１の下方には、筒状の弁ガイド１８が弁軸ホルダ６の収容室６ｈに対して摺動可能に配置されている。この弁ガイド１８は天井部２１側がプレス成形により略直角に折り曲げられている。そして、この天井部２１には貫通孔１８ａが形成されている。また、弁軸４１の下方には、さらに鍔部４１ｂが形成されている。 Further, below the valve shaft 41, a tubular valve guide 18 is slidably arranged with respect to the accommodating chamber 6h of the valve shaft holder 6. The ceiling portion 21 side of the valve guide 18 is bent at a substantially right angle by press molding. A through hole 18a is formed in the ceiling portion 21. Further, a flange portion 41b is further formed below the valve shaft 41.

ここで、弁軸４１は、弁ガイド１８に対して回転可能、かつ径方向に変位可能となるように弁ガイド１８の貫通孔１８ａに遊貫状態で挿入されており、鍔部４１ｂは、弁ガイド１８に対して回転可能、かつ、径方向に変位可能となるように弁ガイド１８内に配置されている。また、弁軸４１は貫通孔１８ａを挿通し、鍔部４１ｂの上面が、弁ガイド１８の天井部２１に対向するように配置されている。なお、鍔部４１ｂが弁ガイド１８の貫通孔１８ａより大径であることにより、弁軸４１の抜け止めがなされている。 Here, the valve shaft 41 is inserted into the through hole 18a of the valve guide 18 in a loose state so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction, and the flange portion 41b is a valve. It is arranged in the valve guide 18 so as to be rotatable with respect to the guide 18 and displaceable in the radial direction. Further, the valve shaft 41 is arranged so that the through hole 18a is inserted and the upper surface of the flange portion 41b faces the ceiling portion 21 of the valve guide 18. Since the flange portion 41b has a diameter larger than that of the through hole 18a of the valve guide 18, the valve shaft 41 is prevented from coming off.

弁軸４１と弁ガイド１８とが互いに径方向に移動可能であることにより、弁軸ホルダ６および弁軸４１の配置位置に関して、さほど高度な同芯取付精度を求められることなく、弁ガイド１８および弁体１７との同芯性が得られる。
弁ガイド１８の天井部２１と弁軸４１の鍔部４１ｂとの間には、中央部に貫通孔が形成されたワッシャ７０が設置されている。 Since the valve shaft 41 and the valve guide 18 can be moved in the radial direction to each other, the valve guide 18 and the valve guide 18 and the valve guide 18 and the valve guide 18 are not required to have a high degree of concentric mounting accuracy with respect to the arrangement positions of the valve shaft holder 6 and the valve shaft 41. Concentricity with the valve body 17 can be obtained.
A washer 70 having a through hole formed in the central portion is installed between the ceiling portion 21 of the valve guide 18 and the flange portion 41b of the valve shaft 41.

次に、実施の形態に係る電動弁２の要部について説明する。図２は、実施の形態に係る電動弁２の要部を拡大した図である。図２に示すように、弁本体３０には、弁室１１が形成されている。本実施の形態において、この弁室１１は、以下に説明する三つの空間に三分される。すなわち、弁室１１には、軸Ｍ方向において、第１管継手１２よりも上側（ロータ４側）の位置に形成された第１空間１１ａ、第１管継手１２よりも下側（第２管継手１５側）の位置に形成された第２空間１１ｂ、第１管継手１２と同レベルの位置に形成された第３空間１１ｃが含まれている。ここで、第１管継手１２よりも上側とは、より具体的には、第１管継手１２の外径の最上端Ｘ１よりも上側を指している。同様に、第１管継手１２よりも下側とは、第１管継手１２の外径の最下端Ｘ２よりも下側を指している。 Next, a main part of the electric valve 2 according to the embodiment will be described. FIG. 2 is an enlarged view of a main part of the electric valve 2 according to the embodiment. As shown in FIG. 2, a valve chamber 11 is formed in the valve body 30. In the present embodiment, the valve chamber 11 is divided into three spaces described below. That is, in the valve chamber 11, the first space 11a formed at a position above the first pipe joint 12 (rotor 4 side) in the axis M direction and below the first pipe joint 12 (second pipe). The second space 11b formed at the position (on the joint 15 side) and the third space 11c formed at the same level as the first pipe joint 12 are included. Here, the upper side of the first pipe joint 12 more specifically means the upper side of the uppermost end X1 of the outer diameter of the first pipe joint 12. Similarly, the lower side of the first pipe joint 12 refers to the lower side of the lowermost end X2 of the outer diameter of the first pipe joint 12.

また、第１空間１１ａは、略円筒状の空間であり、その上部は、弁軸ホルダ６の下部、弁体１７に接している。
また、第２空間１１ｂは、略円環状の空間であり、弁座部材１６の周囲に形成されている。この第２空間１１ｂは、第１管継手１２の外径最下端Ｘ２を弁本体３０の底面３０ａよりも上側に取付けることによって形成される。より好ましくは、第１管継手１２は、第２空間１１ｂの深さ（Ｌ）が第１管継手の内径の半径（Ｄ／２）よりも深くなるように取付けられている（Ｌ＞Ｄ／２）。 Further, the first space 11a is a substantially cylindrical space, and the upper portion thereof is in contact with the lower portion of the valve shaft holder 6 and the valve body 17.
The second space 11b is a substantially annular space, and is formed around the valve seat member 16. The second space 11b is formed by attaching the outermost lower end X2 of the first pipe joint 12 to the upper side of the bottom surface 30a of the valve body 30. More preferably, the first pipe joint 12 is attached so that the depth (L) of the second space 11b is deeper than the radius (D / 2) of the inner diameter of the first pipe joint (L> D /). 2).

また、実施の形態に係る電動弁２においては、高さの高い弁座部材１６が使用されている。具体的には、弁座部材１６としては、第２管継手１５に固定装着した状態において、軸Ｍ方向における天面１６ｂの位置が第１管継手１２の中心軸Ｎの位置よりも上側に位置するものが用いられる。 Further, in the electric valve 2 according to the embodiment, a valve seat member 16 having a high height is used. Specifically, as the valve seat member 16, the position of the top surface 16b in the axis M direction is located above the position of the central axis N of the first pipe joint 12 in a state of being fixedly mounted to the second pipe joint 15. Is used.

また、天面１６ｂは、図３に示すように、第１管継手１２内を図２の（Ｂ）矢印方向から視た場合に視認できる高さに位置するのが好ましい。すなわち、軸Ｍ方向において、天面１６ｂが、第１管継手１２の内径の最上端を超えない位置に弁座部材１６が配置されるのが好ましい。この場合、図４に示すように、第１管継手１２の内径の最下端を上下の基準とすると、天面１６ｂの位置（Ｈ）は、第１管継手１２の中心軸Ｎの位置（Ｄ／２）よりも上側に位置し、第１管継手１２の内径の最上端（Ｄ）よりも下側に位置することになる（Ｄ／２＜Ｈ＜Ｄ）。 Further, as shown in FIG. 3, the top surface 16b is preferably located at a height that can be visually recognized when the inside of the first pipe joint 12 is viewed from the direction of the arrow (B) in FIG. That is, it is preferable that the valve seat member 16 is arranged at a position where the top surface 16b does not exceed the uppermost end of the inner diameter of the first pipe joint 12 in the axis M direction. In this case, as shown in FIG. 4, when the lowermost end of the inner diameter of the first pipe joint 12 is used as the upper and lower reference, the position (H) of the top surface 16b is the position (D) of the central axis N of the first pipe joint 12. It is located above the / 2) and below the uppermost end (D) of the inner diameter of the first pipe joint 12 (D / 2 <H <D).

ここで、図２に示すように、第１管継手１２から弁室１１内に流入する流体の速度は、中心が最も速く、第１管継手１２の内周に近づくほど遅くなる。このため、仮に天面１６ｂを第１管継手１２の中心軸Ｎよりも下側に位置させた場合には、速い速度の流体が弁体１７に直撃し、弁体１７に大きく径方向の負荷を与え、弁体１７を径方向に振動させることになる。 Here, as shown in FIG. 2, the velocity of the fluid flowing into the valve chamber 11 from the first pipe joint 12 is the fastest at the center and becomes slower as it approaches the inner circumference of the first pipe joint 12. Therefore, if the top surface 16b is positioned below the central axis N of the first pipe joint 12, a high-speed fluid directly hits the valve body 17, and a large radial load is applied to the valve body 17. Is given, and the valve body 17 is vibrated in the radial direction.

これに対し、実施の形態に係る電動弁２のように、天面１６ｂが図４を用いて説明した位置（Ｄ／２＜Ｈ＜Ｄ）に位置するようにした場合、図２に示すように、流体の最も早い部分は、一旦弁座部材１６の外周に衝突して速度を低下させ、上下方向に分岐する。上方に分岐した流体は、第１空間１１ａに導入され、下方に分岐した流体は、第２空間１１ｂに導入される。 On the other hand, when the top surface 16b is located at the position (D / 2 <H <D) described with reference to FIG. 4, as in the electric valve 2 according to the embodiment, as shown in FIG. In addition, the earliest part of the fluid once collides with the outer circumference of the valve seat member 16 to reduce the speed and branches in the vertical direction. The fluid branched upward is introduced into the first space 11a, and the fluid branched downward is introduced into the second space 11b.

ここで、実施の形態に係る電動弁２においては、天面１６ｂの高さが上側に位置しすぎないため、上側に分岐した流体によって弁体１７に上向きに加えられる力（図７参照）も低減される。 Here, in the electric valve 2 according to the embodiment, since the height of the top surface 16b is not located too high, the force applied upward to the valve body 17 by the fluid branched upward (see FIG. 7) is also present. It will be reduced.

さらに、弁室１１の下側には、第２空間１１ｂが設けられているため、下方に分岐した流体の逃げ道が確保される。これにより、下方に分岐した流体が逃げ場を失って上側に流れ込み、弁体１７に上向きの力を加えることが抑制される。 Further, since the second space 11b is provided on the lower side of the valve chamber 11, an escape route for the fluid branched downward is secured. As a result, it is suppressed that the fluid branched downward loses the escape place and flows upward, and applies an upward force to the valve body 17.

また、実施の形態に係る電動弁２においては、弁本体３０の内径Ｙ（図２参照）が第１管継手１２の内径（Ｄ）よりも大きくなるように形成されている（Ｙ＞Ｄ）。このため、弁室１１内に流入した流体の逃げ場を的確に確保することができる。 Further, in the electric valve 2 according to the embodiment, the inner diameter Y (see FIG. 2) of the valve body 30 is formed to be larger than the inner diameter (D) of the first pipe joint 12 (Y> D). .. Therefore, it is possible to accurately secure an escape place for the fluid that has flowed into the valve chamber 11.

この実施の形態における電動弁２によれば、弁座部材１６の天面１６ｂの位置を高くすることにより、第１管継手１２から流入した流体を直接弁体１７に衝突させないようにすることができ、弁体１７の径方向の振動を抑制することができる。また、弁本体３０内において、第１空間１１ａの他に第２空間１１ｂを設けることにより、第１管継手１２から流入した流体のすべてが上方に流れて弁体１７に上向きの力が加わり、弁体１７が軸Ｍ方向に振動することを抑制することができる。このように、弁体１７に対する負荷を軽減することにより、弁体１７の径方向、軸方向の振動を低減させることができ、各種流体制御においても、冷凍サイクルでの多彩な冷媒状態、運転状況においても的確に電動弁２の静音性を維持することができる。 According to the electric valve 2 in this embodiment, the position of the top surface 16b of the valve seat member 16 is raised so that the fluid flowing in from the first pipe joint 12 does not directly collide with the valve body 17. It is possible to suppress the radial vibration of the valve body 17. Further, by providing the second space 11b in addition to the first space 11a in the valve body 30, all the fluid flowing in from the first pipe joint 12 flows upward and an upward force is applied to the valve body 17. It is possible to suppress the valve body 17 from vibrating in the axis M direction. By reducing the load on the valve body 17 in this way, it is possible to reduce the radial and axial vibrations of the valve body 17, and even in various fluid controls, various refrigerant states and operating conditions in the refrigeration cycle can be reduced. Even in the above case, the quietness of the electric valve 2 can be accurately maintained.

また、弁座部材１６の天面１６ｂの位置を高くするだけで電動弁２の静音性を維持するため、電動弁２の構造を複雑化することもなく、さらに、吸音部材や消音装置などを用いることもないため、低コストで電動弁２の静音性を維持することができる。 Further, since the quietness of the electric valve 2 is maintained only by raising the position of the top surface 16b of the valve seat member 16, the structure of the electric valve 2 is not complicated, and a sound absorbing member, a sound deadening device, and the like can be used. Since it is not used, the quietness of the electric valve 2 can be maintained at low cost.

また、上述の実施の形態の電動弁２は、たとえば、圧縮機、凝縮器、膨張弁、および蒸発器等から成る冷凍サイクルシステムにおいて、凝縮器と蒸発器との間に設けられる膨張弁として用いられる。 Further, the electric valve 2 of the above-described embodiment is used as an expansion valve provided between the condenser and the evaporator in, for example, a refrigeration cycle system including a compressor, a condenser, an expansion valve, an evaporator and the like. Be done.

２ 電動弁
６ｄ 雌ネジ
１１ 弁室
１１ａ 第１空間
１１ｂ 第２空間
１１ｃ 第３空間
１２ 第１管継手
１５ 第２管継手
１６ 弁座部材
１６ａ 弁ポート
１６ｂ 天面
１７ 弁体
１８ 弁ガイド
３０ 弁本体
３０ａ 底面
４１ａ 雄ネジ
Ｍ 電動弁２の軸
Ｎ 第１管継手１２の中心軸
Ｘ１ 第１管継手１２の外径の最上端
Ｘ２ 第１管継手１２の外径の最下端
Ｙ 弁本体３０の内径 2 Electric valve 6d Female screw 11 Valve chamber 11a 1st space 11b 2nd space 11c 3rd space 12 1st pipe joint 15 2nd pipe joint 16 Valve seat member 16a Valve port 16b Top surface 17 Valve body 18 Valve guide 30 Valve body 30a Bottom surface 41a Male screw M Shaft of electric valve 2 N Central axis of first pipe joint 12 X1 Uppermost end of outer diameter of first pipe joint 12 X2 Lowermost end of outer diameter of first pipe joint 12 Y Inner diameter of valve body 30

Claims (4)

ケースの内周に収容されたロータの回転運動を、雄ネジ部材と雌ネジ部材とのネジ螺合により直線運動に変換し、この直線運動に基づいて弁本体内に収容された弁体を軸方向に移動させる電動弁であって、
前記弁本体の側面に装着された第１管継手と、
前記弁体が近接または離間可能な弁ポートが開口された平坦な天面を有する弁座部材と、
前記弁ポートを介して前記第１管継手と連通する第２管継手とを備え、
前記弁体は、その外径部分が前記弁ポートよりも大きく、かつ先端部分と前記外径部分の間に環状の平面が形成され、
前記弁座部材の前記天面の前記軸方向における位置が、前記第１管継手の中心軸よりも前記ロータ側において、前記第１管継手の内径の最上端を超えない高さに位置し、
前記雌ネジ部材の下端が前記第１管継手の外径の最上端よりも前記ロータ側にあり、かつ前記雌ネジ部材の張出部分の下面と前記第１管継手の外径の最上端の間の寸法が、前記第１管継手の内径よりも大きく、
前記弁本体内の弁室には、前記軸方向において前記第１管継手よりも前記ロータ側に形成された第１空間と、前記軸方向において前記第１管継手よりも前記第２管継手側に形成された第２空間とが含まれ、
前記第１管継手は、前記第２空間の深さが前記第１管継手の内径の半径よりも深くなるように取付けられていることを特徴とする電動弁。 The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by screwing the male screw member and the female screw member, and based on this linear motion, the valve body housed in the valve body is used as an axis. An electric valve that moves in the direction
The first pipe joint mounted on the side surface of the valve body and
A valve seat member having a flat top surface with an open valve port from which the valve body can be brought close to or separated from each other.
A second pipe joint that communicates with the first pipe joint via the valve port is provided.
The valve body has an outer diameter portion larger than that of the valve port, and an annular flat surface is formed between the tip portion and the outer diameter portion.
The position of the top surface of the valve seat member in the axial direction is located on the rotor side of the central axis of the first pipe joint at a height not exceeding the uppermost end of the inner diameter of the first pipe joint.
The lower end of the female screw member is on the rotor side of the uppermost end of the outer diameter of the first pipe joint, and the lower surface of the overhanging portion of the female screw member and the uppermost end of the outer diameter of the first pipe joint. The dimension between them is larger than the inner diameter of the first pipe joint.
In the valve chamber in the valve body, a first space formed on the rotor side of the first pipe joint in the axial direction and a second pipe joint side of the first pipe joint in the axial direction. contains a second space formed,
The first pipe joint is an electric valve that is attached so that the depth of the second space is deeper than the radius of the inner diameter of the first pipe joint. 前記弁本体の内径は、前記第１管継手の内径よりも大きいことを特徴とする請求項１記載の電動弁。 The electric valve according to claim 1, wherein the inner diameter of the valve body is larger than the inner diameter of the first pipe joint. 前記第１管継手の外径最下端が、前記弁本体の内部底面よりも前記ロータ側に配置されていることを特徴とする請求項１または２記載の電動弁。 The electric valve according to claim 1 or 2, wherein the lowermost outer diameter of the first pipe joint is arranged on the rotor side of the inner bottom surface of the valve body. 圧縮機、凝縮器、膨張弁、および蒸発器を含む冷凍サイクルシステムであって、請求項１〜３の何れか一項に記載の電動弁を前記膨張弁として用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 3 is used as the expansion valve. ..
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