JP3825569B2 - Control valve - Google Patents

Control valve Download PDF

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Publication number
JP3825569B2
JP3825569B2 JP29064498A JP29064498A JP3825569B2 JP 3825569 B2 JP3825569 B2 JP 3825569B2 JP 29064498 A JP29064498 A JP 29064498A JP 29064498 A JP29064498 A JP 29064498A JP 3825569 B2 JP3825569 B2 JP 3825569B2
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JP
Japan
Prior art keywords
guide member
valve body
peripheral surface
valve
outer peripheral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP29064498A
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Japanese (ja)
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JP2000120883A (en
Inventor
総一郎 富岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saginomiya Seisakusho Inc
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Saginomiya Seisakusho Inc
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Priority to JP29064498A priority Critical patent/JP3825569B2/en
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Publication of JP3825569B2 publication Critical patent/JP3825569B2/en
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Description

【0001】
【発明の属する技術分野】
この発明は、電動式コントロールバルブ等の制御弁に関し、特に、ガイド部材に案内されてこのガイド部材の軸線方向に移動する弁体を有する制御弁に関するものである。
【0002】
【従来の技術】
冷凍・冷房機器で使用される電動式コントロールバルブ等の制御弁として、筒状のガイド部材により形成される弁体支持孔に、このガイド部材の軸線方向に移動可能に挿入され、ガイド部材に案内されてその軸線方向に移動して弁ポートを開閉する弁体を有する制御弁が知られており、この種の制御弁は、例えば、特開平10−2450号公報に示されている。
【0003】
【発明が解決しようとする課題】
上述のような制御弁では、弁体がガイド部材の軸線方向に移動し得るように、弁体の外径よりも弁体支持孔の内径を少し大きくし、ガイド部材と弁体との間に所要のクリアランスを設ける必要があり、弁体はガイド部材に対してクリアランス分、横方向(径方向)に移動可能になっている。
【0004】
このため、特に、微少弁開度状態では、弁体が高速の流体より力を受けて横方向に振動し、振動音を発生すると云う問題点がある。このため、振動音の発生防止のために、微少弁開度状態での振動を避ける制御プログラムにより流量制御を行わざるを得ず、流量制御精度に影響を及ぼすことになる。
【0005】
この発明は、上述の如き問題点を解消するためになされたもので、弁ポートの開閉には無関係な弁体の横方向の動きを適切に規制し、振動音の発生しないように改良された制御弁を提供することを目的としている。
【0006】
【課題を解決するための手段】
上述の目的を達成するために、請求項1に記載の発明による制御弁は、筒状のガイド部材により形成される弁体支持孔に、前記ガイド部材の軸線方向に移動可能に挿入され、前記ガイド部材に案内されて前記軸線方向に移動して弁ポートを開閉する弁体を有する制御弁において、前記ガイド部材に対する前記軸線方向への移動を許した態様で前記弁体を前記ガイド部材の径方向に付勢し、前記弁体の外周面の部分を前記弁体支持孔の内周面の部分に押し付ける横揺れ防止機構が組み込まれているものである。
【0007】
そして、請求項1に記載の発明による制御弁は、前記横揺れ防止機構が、前記ガイド部材により前記径方向に移動可能に保持されて前記弁体の外周面に当接する押圧子と、前記押圧子を前記弁体の外周面に向けて付勢するばねとにより構成されているものである。
【0008】
また、請求項1に記載の発明による制御弁は、前記押圧子が鋼球により構成されて前記ガイド部材に形成された貫通孔に挿入され、前記ばねが前記ガイド部材の外周面に掛装されて前記鋼球に前記ガイド部材の外方から当接する可撓性の弧状ばねであるものである。
さらに、請求項1に記載の発明による制御弁は、前記弁体の外周面に形成されて前記軸線方向に延在するキー溝状の縦溝に前記鋼球が係合することで、前記キー溝の前記貫通孔に対する前記ガイド部材の周方向への相対移動が規制されているものである。
【0009】
請求項1に記載の発明による制御弁によれば、横揺れ防止機構によって弁体が径方向に付勢され、弁体の外周面の部分が弁体支持孔の内周面の部分に押し付けられる。
【0010】
そして、請求項1に記載の発明による制御弁によれば、ばねにより押圧子を介して弁体がガイド部材の径方向に付勢され、この付勢力により弁体の外周面の部分が弁体支持孔の内周面の部分に押し付けられる。
【0011】
また、請求項1に記載の発明による制御弁によれば、弧状ばねにより鋼球を介して弁体がガイド部材の径方向に付勢され、この付勢力により弁体の外周面の部分が弁体支持孔の内周面の部分に押し付けられ、ガイド部材の軸線方向への弁体の移動に際して鋼球は、ガイド部材の貫通孔内にて転動する。
【0012】
【発明の実施の形態】
以下に添付の図を参照してこの発明の実施の形態を詳細に説明する。
【0013】
図1〜図3はこの発明による制御弁を電動式コントロールバルブに適用した一つの実施の形態を示している。
【0014】
電動式コントロールバルブは弁ハウジング1を有しており、弁ハウジング1はに、入口ポート3、弁室5、弁座部7、弁ポート9、出口ポート11が形成されている。
【0015】
弁ハウジング1には円筒状のガイド部材13が固定されており、ガイド部材13は貫通孔である弁体支持孔15を画定している。換言すれば、弁体支持孔15はガイド部材13より形成されて図にて上下に貫通延在しており、この弁体支持孔15に弁体17の円筒ステム部19が軸線方向(上下方向)に移動可能に嵌合している。
【0016】
弁体17が軸線方向移動し得るよう、従来のもの同様に、円筒ステム部19の外径より弁体支持孔15の内径は少し大きく設定されており、ガイド部材13と円筒ステム部19との間に所要のクリアランスが設けられている。
【0017】
弁体17は、ガイド部材13に案内されて軸線方向移動し、弁体支持孔15の先端側に設けられた円錐弁部20にて弁座部7に選択的に着座し、弁ポート9を開閉する。
【0018】
弁ハウジング1にはマウント部材21によってステッピングモータ23が取り付けられている。ステッピングモータ23は、マウント部材21に固定されたキャップ状のカバー25と、カバー25の外側に固定されたステータコイル27と、カバー25内に上下動且つ回転可能に設けられたロータ29とを有している。ロータ29は、円筒状の永久磁石31とロータ本体33との組立体により構成され、ステータコイル27との電磁作用により回転する。
【0019】
ロータ本体33には連結ロッド35の上端部が、回転可能で軸方向動不能に連結されており、この連結ロッド35の下端部は、弁体17の円筒ステム部19に連結されている。なお、この連結構造のより詳細な構成については、必要に応じて特開平10−2450号公報を参照されたい。
【0020】
また、カイド部材13の上部にはスリーブ状の雌ねじ部材39が固定されており、この雌ねじ部材39には筒状の雄ねじ部材37の下端部が螺着されていて、この雄ねじ部材37の内部を連結ロッド35が挿通されている。また、雄ねじ部材37の上部には、ロータ29に固着された雌ねじ部材29Aが螺着されており、これにより、ロータ29が回転すると雌ねじ部材29Aが雄ねじ部材37に対して螺動して、ロータ29が連結ロッド35と共に上下動し、この連結ロッド35の上下動により弁体17が上下動(軸線方向移動)するように構成されている。
【0021】
ロータ29の上部にはピン41が固定され、カバー25内には固定ロッド43が天井部より垂下された態様で固定されている。固定ロッド43の外周には螺旋ガイド部材45が取り付けられており、螺旋ガイド部材45には可動ストッパ片47が係合している。
【0022】
可動ストッパ片47は、ロータ29の回転によりピン41によって蹴られ、螺旋ガイド部材45に案内されて螺旋移動し、上端側のストッパ部48に当接することによって弁体17の上限位置、すなわち全開位置を規定する。なお、このストッパ構造のより詳細な構成についても、必要に応じて特開平10−2450号公報を参照されたい。
【0023】
弁体17の横揺れ防止機構として、ガイド部材13に形成された貫通孔49に押圧子である鋼球51が移動可能に挿入され、貫通孔49を含んでガイド部材13の外周に形成された周溝53にCリングばね55が係合装着されている。
【0024】
Cリングばね55は、ガイド部材13を取り囲んで鋼球51の背面側と当接し、鋼球51を径方向内側、すなわち弁体17の外周面に向けて付勢している。鋼球51は、Cリングばね55のばね力によって図にて右方へ付勢され、弁体17の外周面に形成されたキー溝状の縦溝57に係合している。
【0025】
これにより、弁体17、特に円筒ステム部19の外周面の部分(図中右側外周面部分)が、弁体支持孔15の内周面の部分(図中右側内周面部分)に押し付けられている。
【0026】
上述のように、弁体17の外周面部分が弁体支持孔15の内周面の部分に押し付けられることにより、弁体17はガイド部材13の径方向へのプリロードを与えられた状態になる。このことにより、ガイド部材13の径方向における弁体17の動きが適切に規制され、微少弁開度状態で、弁体17が、高速の非定常流により力を受けても、ガイド部材13の径方向に振動することがなく、振動音を発生することが回避される。
これにより、微少弁開度状態での制御が可能になり、弁開制御精度が向上する。
【0027】
弁体17の上下動に際しては、縦溝57に係合した状態で鋼球51が転動するから、横揺れ防止機構による弁開閉の摺動抵抗の増加が小さい値に抑えられ、弁開閉用のステッピングモータ23の出力を大きくしなくて済む。
【0028】
尚、本実施形態では、鋼球51を弁体17の外周面に向けて付勢するのが、ガイド部材13の外周に形成された周溝53に係合装着されたCリングばね55であるものとしたが、ガイド部材13の外方から鋼球51に当付られたばね板やコイルスプリング等によって鋼球51を弁体17の外周面に向けて付勢するようにしてもよい。
【0030】
また、本発明は、本実施形態で示した電動式コントロールバルブだけに限らず、ガイド部材に案内されてこのガイド部材の軸線方向に移動する弁体を有する制御弁に広く適用可能であることは言うまでもない。
【0031】
【発明の効果】
以上の説明から理解される如く、請求項1に記載の発明による制御弁によれば、筒状のガイド部材により形成される弁体支持孔に、前記ガイド部材の軸線方向に移動可能に挿入され、前記ガイド部材に案内されて前記軸線方向に移動して弁ポートを開閉する弁体を有する制御弁において、前記ガイド部材に対する前記軸線方向への移動を許した態様で前記弁体を前記ガイド部材の径方向に付勢し、前記弁体の外周面の部分を前記弁体支持孔の内周面の部分に押し付ける横揺れ防止機構が組み込まれているものとした。
【0032】
このため、弁体が径方向に付勢され、弁体の外周面の部分が弁体支持孔の内周面の部分に押し付けられ、弁体はガイド部材のへのプリロードを与えられた状態になって、ガイド部材の径方向への弁体の動きが適切に規制され、微少弁開度状態で弁体が高速の非定常流より力を受けても、弁体がガイド部材の径方向に振動することがなくなり、振動音を発生することが回避される。
【0033】
そして、請求項1に記載の発明による制御弁によれば、前記横揺れ防止機構が、前記ガイド部材により前記径方向に移動可能に保持されて前記弁体の外周面に当接する押圧子と、前記押圧子を前記弁体の外周面に向けて付勢するばねとにより構成されているものとした。
【0034】
このため、ばねにより押圧子を介して弁体がガイド部材の径方向に付勢され、この付勢力により弁体の外周面の部分が弁体支持孔の内周面の部分に押し付けられ、弁体はラジアル方向のプリロードを与えられた状態になって、ガイド部材の径方向への弁体の動きが適切に規制され、微少弁開度状態で弁体が高速の非定常流より力を受けても、弁体がガイド部材の径方向に振動することがなくなり、振動音を発生することが回避される。
【0035】
また、請求項1に記載の発明による制御弁によれば、前記押圧子が鋼球により構成されて前記ガイド部材に形成された貫通孔に挿入され、前記ばねが前記ガイド部材の外周面に掛装されて前記鋼球に前記ガイド部材の外方から当接する可撓性の弧状ばねであるものとした。
【0036】
このため、弧状ばねにより鋼球を介して弁体がガイド部材の径方向に付勢され、この付勢力により弁体の外周面の部分が弁体支持孔の内周面の部分に押し付けられ、弁体はラジアル方向のプリロードを与えられた状態になって、ガイド部材の径方向への弁体の動きが適切に規制され、微少弁開度状態で弁体が高速の流体より力を受けても、弁体がガイド部材の径方向に振動することがなくなり、振動音を発生することが回避される。
【0037】
また、ガイド部材の軸線方向への弁体の移動に際して鋼球は、ガイド部材の貫通孔内にて転動するから、横揺れ防止機構による弁開閉の摺動抵抗の増加が小さい値に抑えられ、弁開閉用の駆動源の出力を大きくしなくて済むようになる。
【図面の簡単な説明】
【図1】この発明による制御弁を電動式コントロールバルブに適用した一つの実施の形態を示す全体断面図である。
【図2】この発明による制御弁の要部を拡大して示す断面図である。
【図3】図2のA−A断面図である。
【符号の説明】
1 弁ハウジング
3 入口ポート
5 弁室
7 弁座部
9 弁ポート
11 出口ポート
13 ガイド部材
15 弁体支持孔
17 弁体
19 円筒ステム部
20 円錐弁部
21 マウント部材
23 ステッピングモータ
25 カバー
27 ステータコイル
29 ロータ
31 永久磁石
33 ロータ本体
35 連結ロッド
37 雄ねじ部
39 雌ねじ部材
41 ピン
43 固定ロッド
45 螺旋ガイド部材
47 可動ストッパ片
49 貫通孔
51 鋼球
53 周溝
55 Cリングばね
57 縦溝
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control valve such as an electric control valve, and more particularly to a control valve having a valve body that is guided by a guide member and moves in the axial direction of the guide member.
[0002]
[Prior art]
As a control valve such as an electric control valve used in refrigeration and cooling equipment, it is inserted into a valve body support hole formed by a cylindrical guide member so as to be movable in the axial direction of the guide member, and guided to the guide member. A control valve having a valve body that moves in the axial direction to open and close a valve port is known, and this type of control valve is disclosed in, for example, Japanese Patent Laid-Open No. 10-2450.
[0003]
[Problems to be solved by the invention]
In the control valve as described above, the inner diameter of the valve body support hole is slightly larger than the outer diameter of the valve body so that the valve body can move in the axial direction of the guide member, and between the guide member and the valve body. It is necessary to provide a required clearance, and the valve body can move in the lateral direction (radial direction) with respect to the guide member by the clearance.
[0004]
For this reason, there is a problem that the valve body vibrates in the lateral direction by receiving a force from a high-speed fluid and generates a vibration sound particularly in a minute valve opening state. For this reason, in order to prevent the generation of vibration noise, the flow control must be performed by a control program that avoids vibration in the minute valve opening state, which affects the flow control accuracy.
[0005]
The present invention has been made to solve the above-mentioned problems, and has been improved so as to appropriately regulate the lateral movement of the valve body regardless of opening and closing of the valve port and to prevent generation of vibration noise. The purpose is to provide a control valve.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, a control valve according to the invention described in claim 1 is inserted into a valve body support hole formed by a cylindrical guide member so as to be movable in the axial direction of the guide member. In a control valve having a valve body that is guided by a guide member and moves in the axial direction to open and close the valve port, the valve body is arranged in a mode that allows movement in the axial direction relative to the guide member. A roll prevention mechanism is incorporated that biases in the direction and presses the outer peripheral surface portion of the valve body against the inner peripheral surface portion of the valve body support hole.
[0007]
In the control valve according to the first aspect of the present invention, the roll prevention mechanism is held by the guide member so as to be movable in the radial direction, and is pressed against the outer peripheral surface of the valve body; The spring is configured to urge the child toward the outer peripheral surface of the valve body.
[0008]
In the control valve according to the first aspect of the present invention, the pressing element is formed of a steel ball and is inserted into a through hole formed in the guide member, and the spring is hooked on the outer peripheral surface of the guide member. And a flexible arc spring that contacts the steel ball from the outside of the guide member.
Furthermore, in the control valve according to the first aspect of the present invention, the steel ball is engaged with a key groove-like vertical groove formed on the outer peripheral surface of the valve body and extending in the axial direction, whereby the key The relative movement of the guide member in the circumferential direction with respect to the through hole of the groove is restricted.
[0009]
According to the control valve of the first aspect of the present invention, the valve body is urged in the radial direction by the roll prevention mechanism, and the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole. .
[0010]
According to the control valve of the first aspect of the present invention, the valve body is urged in the radial direction of the guide member by the spring via the pressing member, and the outer peripheral surface portion of the valve body is urged by the urging force. It is pressed against the inner peripheral surface of the support hole.
[0011]
According to the control valve of the first aspect of the present invention, the valve body is urged in the radial direction of the guide member by the arc-shaped spring through the steel ball, and the portion of the outer peripheral surface of the valve body is urged by this urging force. The steel ball rolls in the through hole of the guide member when it is pressed against the inner peripheral surface of the body support hole and the valve body moves in the axial direction of the guide member.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[0013]
1 to 3 show an embodiment in which the control valve according to the present invention is applied to an electric control valve.
[0014]
The electric control valve has a valve housing 1, and an inlet port 3, a valve chamber 5, a valve seat portion 7, a valve port 9, and an outlet port 11 are formed in the valve housing 1.
[0015]
A cylindrical guide member 13 is fixed to the valve housing 1, and the guide member 13 defines a valve body support hole 15 that is a through hole. In other words, the valve body support hole 15 is formed by the guide member 13 and extends vertically through the figure, and the cylindrical stem portion 19 of the valve body 17 is inserted into the valve body support hole 15 in the axial direction (vertical direction). ) Is movably fitted.
[0016]
The inner diameter of the valve body support hole 15 is set to be slightly larger than the outer diameter of the cylindrical stem portion 19 so that the valve body 17 can move in the axial direction, and the guide member 13 and the cylindrical stem portion 19 The required clearance is provided between them.
[0017]
The valve body 17 is guided by the guide member 13 and moves in the axial direction. The valve body 17 is selectively seated on the valve seat portion 7 by the conical valve portion 20 provided on the distal end side of the valve body support hole 15. Open and close.
[0018]
A stepping motor 23 is attached to the valve housing 1 by a mount member 21. The stepping motor 23 includes a cap-like cover 25 fixed to the mount member 21, a stator coil 27 fixed to the outside of the cover 25, and a rotor 29 provided in the cover 25 so as to move up and down and rotate. is doing. The rotor 29 is constituted by an assembly of a cylindrical permanent magnet 31 and a rotor main body 33, and rotates by electromagnetic action with the stator coil 27.
[0019]
An upper end portion of a connecting rod 35 is connected to the rotor body 33 so as to be rotatable but cannot move in the axial direction, and a lower end portion of the connecting rod 35 is connected to the cylindrical stem portion 19 of the valve body 17. For a more detailed structure of this connection structure, refer to Japanese Patent Laid-Open No. 10-2450 as necessary.
[0020]
A sleeve-shaped female screw member 39 is fixed to the upper portion of the guide member 13, and a lower end portion of a cylindrical male screw member 37 is screwed to the female screw member 39. The connecting rod 35 is inserted. A female screw member 29A fixed to the rotor 29 is screwed onto the male screw member 37. As a result, when the rotor 29 rotates, the female screw member 29A is screwed with respect to the male screw member 37, and the rotor is rotated. 29 moves up and down together with the connecting rod 35, and the valve body 17 moves up and down (moves in the axial direction) by the up and down movement of the connecting rod 35.
[0021]
A pin 41 is fixed to the upper portion of the rotor 29, and a fixing rod 43 is fixed in the cover 25 in a manner that it is suspended from the ceiling. A spiral guide member 45 is attached to the outer periphery of the fixed rod 43, and a movable stopper piece 47 is engaged with the spiral guide member 45.
[0022]
The movable stopper piece 47 is kicked by the pin 41 by the rotation of the rotor 29, spirally moved by being guided by the spiral guide member 45, and brought into contact with the stopper portion 48 on the upper end side, whereby the upper limit position of the valve body 17, that is, the fully open position. Is specified. For more detailed configuration of the stopper structure, refer to Japanese Patent Laid-Open No. 10-2450 as necessary.
[0023]
As a rolling prevention mechanism for the valve body 17, a steel ball 51 as a presser is movably inserted into a through hole 49 formed in the guide member 13, and is formed on the outer periphery of the guide member 13 including the through hole 49. A C-ring spring 55 is engaged with the circumferential groove 53.
[0024]
The C-ring spring 55 surrounds the guide member 13 and comes into contact with the back side of the steel ball 51, and biases the steel ball 51 toward the radially inner side, that is, toward the outer peripheral surface of the valve element 17. The steel ball 51 is urged rightward in the drawing by the spring force of the C ring spring 55 and is engaged with a key groove-like vertical groove 57 formed on the outer peripheral surface of the valve body 17.
[0025]
As a result, the outer peripheral surface portion (right outer peripheral surface portion in the figure) of the valve body 17, particularly the cylindrical stem portion 19, is pressed against the inner peripheral surface portion (right inner peripheral surface portion in the figure) of the valve body support hole 15. ing.
[0026]
As described above, the outer peripheral surface portion of the valve body 17 is pressed against the inner peripheral surface portion of the valve body support hole 15, so that the valve body 17 is given a preload in the radial direction of the guide member 13. . As a result, the movement of the valve body 17 in the radial direction of the guide member 13 is appropriately regulated, and even if the valve body 17 receives a force due to a high-speed unsteady flow in the minute valve opening state, the guide member 13 Generation of vibration noise is avoided without vibration in the radial direction.
Thereby, the control in the minute valve opening state becomes possible, and the valve opening control accuracy is improved.
[0027]
When the valve body 17 moves up and down, the steel ball 51 rolls in a state of being engaged with the longitudinal groove 57, so that the increase in sliding resistance of the valve opening and closing by the roll prevention mechanism is suppressed to a small value, and the valve opening and closing is performed. It is not necessary to increase the output of the stepping motor 23.
[0028]
In this embodiment, the C-ring spring 55 engaged with the circumferential groove 53 formed on the outer periphery of the guide member 13 biases the steel ball 51 toward the outer peripheral surface of the valve body 17. However, the steel ball 51 may be urged toward the outer peripheral surface of the valve body 17 from the outside of the guide member 13 by a spring plate or a coil spring applied to the steel ball 51 .
[0030]
Further, the present invention is not limited to the electric control valve shown in the present embodiment, and is widely applicable to a control valve having a valve body that is guided by a guide member and moves in the axial direction of the guide member. Needless to say.
[0031]
【The invention's effect】
As can be understood from the above description, the control valve according to the first aspect of the present invention is inserted into the valve body support hole formed by the cylindrical guide member so as to be movable in the axial direction of the guide member. A control valve having a valve body that is guided by the guide member and moves in the axial direction to open and close a valve port, wherein the valve body is moved in the axial direction with respect to the guide member in a manner allowing the guide member to move in the axial direction. The roll prevention mechanism is incorporated so that the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole.
[0032]
For this reason, the valve body is urged in the radial direction, the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole, and the valve body is in a state of being preloaded to the guide member. Therefore, even if the movement of the valve body in the radial direction of the guide member is appropriately regulated and the valve body receives a force from a high-speed unsteady flow in a minute valve opening state, the valve body is in the radial direction of the guide member. The vibration is eliminated and the generation of vibration noise is avoided.
[0033]
According to the control valve of the invention of claim 1 , the roll prevention mechanism is held by the guide member so as to be movable in the radial direction, and presses against the outer peripheral surface of the valve body, It is assumed that the pressing element is constituted by a spring that urges the pressing element toward the outer peripheral surface of the valve body.
[0034]
For this reason, the valve body is urged in the radial direction of the guide member by the spring via the pressing element, and the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole by this urging force. The body is given a radial preload, the movement of the valve body in the radial direction of the guide member is appropriately restricted, and the valve body receives a force from a high-speed unsteady flow in the minute valve opening state. However, the valve body does not vibrate in the radial direction of the guide member, and generation of vibration noise is avoided.
[0035]
According to the control valve of the first aspect of the present invention, the pressing element is formed of a steel ball and is inserted into a through hole formed in the guide member, and the spring is applied to the outer peripheral surface of the guide member. It is a flexible arc spring that is mounted and contacts the steel ball from the outside of the guide member.
[0036]
For this reason, the valve body is urged in the radial direction of the guide member via the steel ball by the arc spring, and the outer peripheral surface portion of the valve body is pressed against the inner peripheral surface portion of the valve body support hole by this urging force, The valve body is given a radial preload, the movement of the valve body in the radial direction of the guide member is appropriately regulated, and the valve body receives a force from a high-speed fluid in a minute valve opening state. However, the valve body does not vibrate in the radial direction of the guide member, and generation of vibration noise is avoided.
[0037]
Further, when the valve body moves in the axial direction of the guide member, the steel ball rolls in the through hole of the guide member, so that the increase in the sliding resistance of the valve opening / closing by the roll prevention mechanism is suppressed to a small value. Therefore, it is not necessary to increase the output of the drive source for opening and closing the valve.
[Brief description of the drawings]
FIG. 1 is an overall sectional view showing an embodiment in which a control valve according to the present invention is applied to an electric control valve.
FIG. 2 is an enlarged cross-sectional view showing a main part of a control valve according to the present invention.
3 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve housing 3 Inlet port 5 Valve chamber 7 Valve seat part 9 Valve port 11 Outlet port 13 Guide member 15 Valve body support hole 17 Valve body 19 Cylindrical stem part 20 Conical valve part 21 Mount member 23 Stepping motor 25 Cover 27 Stator coil 29 Rotor 31 Permanent magnet 33 Rotor body 35 Connecting rod 37 Male thread part 39 Female thread member 41 Pin 43 Fixed rod 45 Spiral guide member 47 Movable stopper piece 49 Through hole 51 Steel ball 53 Circumferential groove 55 C ring spring 57 Vertical groove

Claims (1)

筒状のガイド部材により形成される弁体支持孔に、前記ガイド部材の軸線方向に移動可能に挿入され、前記ガイド部材に案内されて前記軸線方向に移動して弁ポートを開閉する弁体を有する制御弁において、
前記ガイド部材に対する前記軸線方向への移動を許した態様で前記弁体を前記ガイド部材の径方向に付勢し、前記弁体の外周面の部分を前記弁体支持孔の内周面の部分に押し付ける横揺れ防止機構が組み込まれており、
前記横揺れ防止機構は、前記ガイド部材により前記径方向に移動可能に保持されて前記弁体の外周面に当接する押圧子と、前記押圧子を前記弁体の外周面に向けて付勢するばねとにより構成されており、
前記押圧子は鋼球により構成されて前記ガイド部材に形成された貫通孔に挿入され、前記ばねは前記ガイド部材の外周面に掛装されて前記鋼球に前記ガイド部材の外方から当接する可撓性の弧状ばねであり、
前記弁体の外周面に形成されて前記軸線方向に延在するキー溝状の縦溝に前記鋼球が係合することで、前記キー溝の前記貫通孔に対する前記ガイド部材の周方向への相対移動が規制されていることを特徴とする制御弁。
A valve body which is inserted into a valve body support hole formed by a cylindrical guide member so as to be movable in the axial direction of the guide member, and which is guided by the guide member and moves in the axial direction to open and close the valve port. Having a control valve,
The valve body is urged in the radial direction of the guide member in a manner allowing movement in the axial direction with respect to the guide member, and an outer peripheral surface portion of the valve body is a portion of an inner peripheral surface of the valve body support hole. rolling preventing mechanism for pressing the is incorporated,
The roll prevention mechanism is held by the guide member so as to be movable in the radial direction, and presses against the outer peripheral surface of the valve body, and biases the presser toward the outer peripheral surface of the valve body. It consists of a spring and
The pressing element is formed of a steel ball and is inserted into a through hole formed in the guide member, and the spring is hooked on the outer peripheral surface of the guide member and abuts the steel ball from the outside of the guide member. A flexible arc spring;
The steel ball engages with a key groove-like vertical groove formed on the outer peripheral surface of the valve body and extending in the axial direction, so that the guide member extends in the circumferential direction with respect to the through hole of the key groove. A control valve characterized in that relative movement is restricted .
JP29064498A 1998-10-13 1998-10-13 Control valve Expired - Fee Related JP3825569B2 (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108291663A (en) * 2016-08-04 2018-07-17 太平洋工业株式会社 Motor-driven valve

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6522389B2 (en) * 2015-03-30 2019-05-29 株式会社ケーヒン Valve device
CN107435753B (en) * 2016-05-25 2019-12-24 浙江三花智能控制股份有限公司 Electronic expansion valve and refrigeration equipment with same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108291663A (en) * 2016-08-04 2018-07-17 太平洋工业株式会社 Motor-driven valve
US10267434B2 (en) 2016-08-04 2019-04-23 Pacific Industrial Co., Ltd. Motor-operated valve

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