JP2009168050A - Reversible flow rate control valve - Google Patents

Reversible flow rate control valve Download PDF

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JP2009168050A
JP2009168050A JP2008003673A JP2008003673A JP2009168050A JP 2009168050 A JP2009168050 A JP 2009168050A JP 2008003673 A JP2008003673 A JP 2008003673A JP 2008003673 A JP2008003673 A JP 2008003673A JP 2009168050 A JP2009168050 A JP 2009168050A
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valve
valve shaft
screw portion
valve body
flow control
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JP5106135B2 (en
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Hideki Sotozono
英樹 外園
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Fujikoki Corp
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Fujikoki Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a reversible flow rate control valve incorporating a larger-sized spring member (coil spring) without causing growing in size of the whole reversible flow rate control valve including a stepping motor, and coping with a large capacity and the like in a compact configuration. <P>SOLUTION: A cylindrical spring storage part 24B with a larger diameter than that of a first movable screw part 29 is provided below the first movable screw part 29 in a valve shaft 24. A cylindrical fitting part 26a in which the cylindrical spring storage part 24B is fitted and has a larger diameter than that of a first fixed screw part 28, is provided below the first fixed screw part 28 in a guide bush 6. A valve element 24A is movably fitted in the cylindrical spring storage part 24B in the axial direction and locked by a locking part 38 provided in the cylindrical spring storage part 24B. A compression coil spring 34 for energizing the valve element 24A downward is shrinkably installed in the cylindrical spring storage part 24B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、空気調和機、冷蔵庫等に組み込まれて使用される可逆式流量制御弁に係り、特に、大容量化、高圧冷媒使用、冷媒可逆（両流れ）仕様等に対応可能な可逆式流量制御弁に関する。   The present invention relates to a reversible flow control valve used by being incorporated in an air conditioner, a refrigerator, or the like, and in particular, a reversible flow rate that can accommodate a large capacity, use of a high-pressure refrigerant, reversible refrigerant (both flow) specifications, and the like. It relates to a control valve.

空気調和機、冷蔵庫等に組み込まれる電動弁としては、従来、次のような構成のものが知られている（例えば下記特許文献１等を参照）。   As an electric valve incorporated in an air conditioner, a refrigerator, or the like, conventionally, an electric valve having the following configuration is known (see, for example, Patent Document 1 below).

すなわち、この電動弁は、弁体を有する弁軸と、前記弁体が接離する弁座を有する弁本体と、該弁本体に接合されたキャンと、該キャンの内周に配在されたロータと、該ロータを回転駆動すべく前記キャンの外周に配在されたステータと、前記弁本体に固定され前記弁軸が内挿されたガイドブッシュと、前記弁軸及びガイドブッシュの外周に配在され前記ロータに一体回転可能に連結された弁軸ホルダと、を備え、前記弁軸は、前記弁軸ホルダと一体回転可能とされるとともに、前記弁軸ホルダに対して軸方向に相対移動可能とされ、かつ、前記弁体を前記弁座に接離させるべく、前記ガイドブッシュの内周に形成された固定ねじ部と、前記弁軸の外周に形成されて、前記固定ねじ部に螺合せしめられる可動ねじ部とからなる流量調整用ねじ送り機構が設けられている。   That is, the motor-operated valve is disposed on a valve shaft having a valve body, a valve main body having a valve seat to which the valve body contacts and separates, a can joined to the valve main body, and an inner periphery of the can A rotor, a stator disposed on the outer periphery of the can for rotationally driving the rotor, a guide bush fixed to the valve body and having the valve shaft inserted therein, and an outer periphery of the valve shaft and the guide bush. A valve shaft holder that is connected to the rotor so as to be integrally rotatable. The valve shaft is rotatable integrally with the valve shaft holder and is relatively moved in the axial direction with respect to the valve shaft holder. And a fixing screw portion formed on the inner periphery of the guide bush and an outer periphery of the valve shaft to screw the valve body into and out of contact with the valve seat. A flow adjustment screw consisting of a movable screw that can be fitted together Mechanism is provided Ri.

しかし、かかる従来の電動弁では、特に高圧の冷媒が用いられる場合、冷媒の通過流量を細かく調整することが難しい等の問題があった。   However, such a conventional motor operated valve has a problem that it is difficult to finely adjust the flow rate of the refrigerant, particularly when a high-pressure refrigerant is used.

そこで、かかる問題等を解消すべく、下記特許文献２には、次のような構成のものが開示されている。   Therefore, in order to solve such problems and the like, the following Patent Document 2 discloses the following configuration.

すなわち、この電動弁は、流量調整用ねじ送り機構に加えて回転規制用ねじ送り機構が設けられているもので、具体的には、弁体を有する弁軸と、前記弁体が接離する弁座を有する弁本体と、該弁本体に接合されたキャンと、該キャンの内周に配在されたロータと、該ロータを回転駆動すべく前記キャンの外周に配在されたステータと、前記弁本体に固定され前記弁軸が内挿されたガイドブッシュと、前記弁軸及びガイドブッシュの外周に配在され前記ロータに一体回転可能に連結された弁軸ホルダとを備える。   In other words, this electric valve is provided with a rotation regulating screw feed mechanism in addition to a flow rate adjusting screw feed mechanism. Specifically, the valve shaft having the valve body and the valve body come into contact with and separate from each other. A valve body having a valve seat; a can joined to the valve body; a rotor disposed on an inner periphery of the can; a stator disposed on an outer periphery of the can to rotationally drive the rotor; A guide bush fixed to the valve body and having the valve shaft inserted therein, and a valve shaft holder disposed on the outer periphery of the valve shaft and the guide bush and connected to the rotor so as to be integrally rotatable.

そして、前記弁軸は、前記弁軸ホルダと一体回転可能とされるとともに、前記弁軸ホルダに対して軸方向に相対移動可能とされ、かつ、前記弁体を前記弁座に接離させるべく、前記ガイドブッシュの内周に形成された第１固定ねじ部と、前記弁軸の外周に形成されて、前記第１固定ねじ部に螺合せしめられる第１可動ねじ部と、からなる流量調整用ねじ送り機構が設けられるとともに、前記ガイドブッシュの外周に形成された第２固定ねじ部と、前記弁軸ホルダの内周に形成されて、前記第２固定ねじ部に螺合せしめられる第２可動ねじ部と、からなる回転規制用ねじ送り機構が設けられている。   The valve shaft can rotate integrally with the valve shaft holder, can move relative to the valve shaft holder in the axial direction, and can bring the valve body into and out of contact with the valve seat. A flow rate adjustment comprising: a first fixed screw portion formed on the inner periphery of the guide bush; and a first movable screw portion formed on the outer periphery of the valve shaft and screwed onto the first fixed screw portion. And a second fixing screw portion formed on the outer periphery of the guide bush and a second fixing screw portion formed on the inner periphery of the valve shaft holder and screwed to the second fixing screw portion. A rotation regulating screw feed mechanism comprising a movable screw portion is provided.

さらに好ましい態様では、弁軸における可動ねじ部の下側に筒状ばね収容部が設けられ、前記弁体は、前記筒状ばね収容部に軸方向に移動可能に嵌挿されるとともに、前記筒状ばね収容部の下端部に設けられた係止部により抜け止め係止され、かつ、前記筒状ばね収容部には、前記弁体を下方に付勢するばね部材が収容されている。   In a further preferred aspect, a cylindrical spring accommodating portion is provided below the movable screw portion in the valve shaft, and the valve body is fitted and inserted into the cylindrical spring accommodating portion so as to be movable in the axial direction. A retaining member provided at the lower end of the spring accommodating portion is retained and retained, and the tubular spring accommodating portion accommodates a spring member that urges the valve body downward.

前記ばね部材は、弁体が弁座（弁シート部）に当接する閉弁状態において所要のシール圧を得るため（弁締め切りのため）、及び、弁体が弁座に衝接した際の衝撃を緩和するために配備されており、通常は圧縮コイルばねが使用されている。   The spring member obtains a required sealing pressure in a closed state in which the valve body abuts on the valve seat (valve seat portion) (for valve closing), and an impact when the valve body comes into contact with the valve seat. In general, compression coil springs are used.

このような構成の電動弁では、既存の電動弁に用いられている電動モータ等の部品を共用しながら、高圧の冷媒が用いられる場合でも、回転規制（ロータ位置決め）等に支障を来すことなく、冷媒の通過流量を微少流量まで精確に調整することができる。   In such a motor-operated valve, parts such as an electric motor used in an existing motor-operated valve are shared, and even when a high-pressure refrigerant is used, it may interfere with rotation regulation (rotor positioning). In addition, the flow rate of the refrigerant can be accurately adjusted to a very small flow rate.

特開２００１−５０４１５号公報JP 2001-50415 A 特開２００６−７０９８８号公報JP 2006-70988 A

しかしながら、前記特許文献２に所載の電動弁においても、次のような課題があった。
すなわち、大容量化、高圧冷媒使用、冷媒可逆（両流れ）仕様等に対応させるためには、前記した、弁体を閉方向に付勢する圧縮コイルばねのサイズをより大きなものに変更する必要があるが、圧縮コイルばねのサイズを大きくすると、当該電動弁の構造上、弁軸、ガイドブッシュ、弁軸ホルダに形成される第１及び第２固定ねじ部並びに第１及び第２可動ねじ部のサイズ（ピッチ円直径）も大きくする必要がある。 However, the electric valve described in Patent Document 2 also has the following problems.
That is, in order to cope with the increase in capacity, use of high-pressure refrigerant, reversible refrigerant (both flow) specifications, etc., it is necessary to change the size of the compression coil spring that biases the valve body in the closing direction as described above. However, when the size of the compression coil spring is increased, the first and second fixed screw portions and the first and second movable screw portions formed on the valve shaft, the guide bush, the valve shaft holder due to the structure of the electric valve. The size (pitch circle diameter) must also be increased.

ところが、固定ねじ部や移動ねじ部を大きくすると、それらの間の摩擦抵抗が増大し、弁開閉動作に大きな駆動力が必要となり、ステッピングモータとして出力トルクの大きなもの、すなわち、大型で価格の高いものを使用しなければならず、また、消費電力も大きくなるという問題があった。   However, when the fixed screw part and the moving screw part are enlarged, the frictional resistance between them increases, and a large driving force is required for the valve opening / closing operation, and the stepping motor has a large output torque, that is, large and expensive. There has been a problem that a product must be used and power consumption increases.

本発明は、このような事情に鑑みてなされたもので、その目的とするところは、ステッピングモータを含む可逆式流量制御弁全体の大型化を招くことなく、より大きなサイズのばね部材（コイルばね）を組み込むことができるようにされ、もって、コンパクトな構成のもとで大容量化等に対応できるようにされた可逆式流量制御弁を提供することにある。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a spring member (coil spring) having a larger size without causing an increase in the size of the entire reversible flow control valve including the stepping motor. In other words, a reversible flow control valve is provided which can accommodate a large capacity under a compact configuration.

前記目的を達成すべく、本発明に係る可逆式流量制御弁は、基本的には、弁体を有する弁軸と、前記弁体が接離する弁座を有する弁本体と、該弁本体に接合されたキャンと、該キャンの内周に配在されたロータと、該ロータを回転駆動すべく前記キャンの外周に配在されたステータと、前記弁本体に固定されるとともに前記弁軸が内挿されたガイドブッシュと、前記弁軸及びガイドブッシュの外周に配在されて前記ロータに一体回転可能に連結された弁軸ホルダとを備え、前記弁軸は、前記弁軸ホルダと一体回転可能とされるとともに、前記弁軸ホルダに対して軸方向に相対移動可能とされ、かつ、前記弁体を前記弁座に接離させるべく、前記ガイドブッシュの内周に形成された第１固定ねじ部及び前記弁軸の外周に形成されて前記第１固定ねじ部に螺合せしめられる第１可動ねじ部とからなる流量調整用ねじ送り機構が設けられるとともに、前記ガイドブッシュの外周に形成された第２固定ねじ部及び前記弁軸ホルダの内周に形成されて前記第２固定ねじ部に螺合せしめられる第２可動ねじ部とからなる回転規制用ねじ送り機構が設けられる。   In order to achieve the above object, a reversible flow control valve according to the present invention basically includes a valve shaft having a valve body, a valve main body having a valve seat with which the valve body contacts and separates, and the valve main body. The bonded can, the rotor disposed on the inner periphery of the can, the stator disposed on the outer periphery of the can for rotationally driving the rotor, and the valve shaft fixed to the valve body. A guide bush that is inserted; and a valve shaft holder that is disposed on an outer periphery of the valve shaft and the guide bush and is connected to the rotor so as to be integrally rotatable. The valve shaft rotates integrally with the valve shaft holder. A first fixing formed on an inner periphery of the guide bush so as to be movable relative to the valve shaft holder in the axial direction and to allow the valve body to contact and separate from the valve seat. The first fixing formed on the outer periphery of the threaded portion and the valve shaft A flow rate adjusting screw feed mechanism comprising a first movable screw portion screwed to the threaded portion is provided, and a second fixed screw portion formed on the outer periphery of the guide bush and an inner periphery of the valve shaft holder There is provided a rotation restricting screw feed mechanism comprising a second movable screw portion screwed into the second fixed screw portion.

そして、前記弁軸における第１可動ねじ部の下側に、該第１可動ねじ部より大径の天井部付き筒状ばね収容部が設けられるとともに、前記ガイドブッシュにおける第１固定ねじ部の下側に、前記筒状ばね収容部が嵌挿される、前記第１固定ねじ部より大径の天井部付き筒状嵌挿部が設けられ、前記弁体は、前記筒状ばね収容部に軸方向に移動可能に嵌挿されるとともに、前記筒状ばね収容部に設けられた係止部により抜け止め係止され、かつ、前記筒状ばね収容部には、前記弁体を下方に付勢するばね部材が収容されていることを特徴としている。   A cylindrical spring accommodating portion with a ceiling portion having a larger diameter than the first movable screw portion is provided below the first movable screw portion in the valve shaft, and below the first fixed screw portion in the guide bush. On the side, a cylindrical fitting insertion portion with a ceiling portion larger in diameter than the first fixing screw portion, into which the cylindrical spring accommodating portion is fitted, is provided, and the valve body is axially disposed on the cylindrical spring accommodating portion. A spring that is movably inserted into the cylindrical spring, and is latched and retained by a latching portion provided in the cylindrical spring accommodating portion, and the cylindrical spring accommodating portion biases the valve body downward. The member is accommodated.

好ましい態様では、前記流量調整用ねじ送り機構のピッチと前記ロータ位置決め用ねじ送り機構のピッチとが同じにされる。   In a preferred embodiment, the pitch of the flow rate adjusting screw feed mechanism is the same as the pitch of the rotor positioning screw feed mechanism.

他の好ましい態様では、前記弁軸ホルダが回転しながら上動せしめられるとき、前記第２固定ねじ部から前記第２可動ねじ部がねじ抜けするより先に、前記筒状ばね収容部の天井部が前記筒状嵌挿部の天井部に衝接してその回転上動を阻止するようにされる。   In another preferred aspect, when the valve shaft holder is moved upward while rotating, the ceiling portion of the cylindrical spring accommodating portion is removed before the second movable screw portion is unscrewed from the second fixed screw portion. Is brought into contact with the ceiling portion of the cylindrical fitting insertion portion to prevent its upward movement.

他の好ましい態様では、前記第１固定ねじ部の径は前記第２固定ねじ部の径の１／２以下とされる。   In another preferred embodiment, the diameter of the first fixing screw portion is not more than ½ of the diameter of the second fixing screw portion.

他の好ましい態様では、前記弁本体に前記弁軸の筒状ばね収容部が摺動自在に嵌挿される弁軸ガイド部が設けられる。   In another preferred aspect, a valve shaft guide portion into which a tubular spring accommodating portion of the valve shaft is slidably fitted is provided in the valve body.

他の好ましい態様では、前記弁軸の上端部に、断面非円形の回転連動用嵌挿部を持つプッシュナットの下部に形成れさたスリーブ状部が圧入により外嵌固定され、前記弁軸ホルダの天井部に、前記弁軸及びプッシュナットを一体的に連動回転させるとともに軸方向の相対移動は許容するように、前記回転連動用嵌挿部が挿入される断面非円形の挿通穴が形成される。   In another preferred aspect, a sleeve-like part formed at the lower part of a push nut having a rotation interlocking insertion part having a non-circular cross section is fixed to the upper end part of the valve shaft by press fitting, and the valve shaft holder A non-circular insertion hole into which the rotation interlocking insertion portion is inserted is formed in the ceiling portion so as to integrally rotate the valve shaft and the push nut and allow relative movement in the axial direction. The

他の好ましい態様では、前記弁軸、前記プッシュナット、前記弁軸ホルダ、及び前記ガイドブッシュ等の組立時の便宜を図るべく、前記ガイドブッシュの第１固定ねじ部に前記弁軸の第１可動ねじ部を螺合させるとともに、前記ガイドブッシュの第２固定ねじ部に前記弁ホルダの第２可動ねじ部を螺合させた状態で、前記プッシュナットのスリーブ状部を前記弁軸の上端部に上から押し込むようにして圧入する際には、その圧入より先に前記回転連動用嵌挿部の一部が前記弁ホルダの挿通穴に挿入されている状態となるように、各部の寸法が設定される。   In another preferred aspect, the first movable screw shaft is fixed to the first fixed screw portion of the guide bush for the convenience of assembly of the valve shaft, the push nut, the valve shaft holder, the guide bush, and the like. While the screw portion is screwed together, the sleeve-like portion of the push nut is connected to the upper end portion of the valve shaft while the second movable screw portion of the valve holder is screwed to the second fixed screw portion of the guide bush. When press-fitting in from above, the dimensions of each part are set so that a part of the rotation interlocking insertion part is inserted into the insertion hole of the valve holder prior to the press-fitting Is done.

他の好ましい態様では、前記弁軸ホルダの天井部上にコイルばねが配在されるとともに、該コイルばねの下部内周に前記プッシュナットの上部が挿入され、前記弁ホルダが許容最大上動位置を越えてさらに上動しようとする際には、前記コイルばねの上端が前記キャンの天井部に圧接して、該コイルばねと前記キャン、前記弁軸ホルダ、及び前記プッシュナット等との間の摩擦トルク及び前記コイルばねのねじりトルクにより、前記弁軸ホルダの回転上動が阻止されるように構成される。   In another preferred embodiment, a coil spring is disposed on the ceiling portion of the valve shaft holder, and an upper portion of the push nut is inserted into a lower inner periphery of the coil spring, so that the valve holder is in an allowable maximum upward movement position. When the upper end of the coil spring is further moved upward, the upper end of the coil spring is in pressure contact with the ceiling of the can, and between the coil spring and the can, the valve shaft holder, the push nut, etc. The valve shaft holder is prevented from rotating upward by the friction torque and the torsional torque of the coil spring.

他の好ましい態様では、前記筒状ばね収容部内に、前記ばね部材としての圧縮コイルばねが配在されるとともに、該圧縮コイルばねと前記弁体との間に、実質的に点接触となる曲面部を持つ曲面ばね受け部材が介装される。   In another preferred aspect, a compression coil spring as the spring member is disposed in the cylindrical spring accommodating portion, and a curved surface that is substantially in point contact between the compression coil spring and the valve body. A curved spring receiving member having a portion is interposed.

他の好ましい態様では、前記弁体及び曲面ばね受け部材に硬質めっき又は低摩擦めっき、あるいは、弁体のみに硬質めっき又は低摩擦めっきを施すようにされる。   In another preferred embodiment, the valve body and the curved spring receiving member are subjected to hard plating or low friction plating, or only the valve body is subjected to hard plating or low friction plating.

他の好ましい態様では、前記ガイドブッシュもしくは弁本体に設けられた固定ストッパと、前記弁軸ホルダに設けられ、前記固定ストッパに衝接可能とされた可動ストッパと、からなるロータ位置決め用ストッパ機構を備える。   In another preferred embodiment, there is provided a rotor positioning stopper mechanism comprising a fixed stopper provided on the guide bush or the valve main body, and a movable stopper provided on the valve shaft holder and capable of coming into contact with the fixed stopper. Prepare.

本発明に係る可逆式流量制御弁では、弁軸における第１可動ねじ部の下側に、該第１可動ねじ部より大径の天井部付き筒状ばね収容部が設けられるとともに、前記ガイドブッシュにおける第１固定ねじ部の下側に、前記筒状ばね収容部が嵌挿される、前記第１固定ねじ部より大径の天井部付き筒状嵌挿部が設けられるので、第１及び第２固定ねじ部並びに第１及び第２可動ねじ部のサイズを大きくすることなく、弁体を閉方向に付勢するばね部材としての圧縮コイルばねのサイズをより大きなものとすることができる。そのため、ステッピングモータを含む可逆式流量制御弁全体の大型化を招くことなく、より大きなサイズのばね部材（コイルばね）を組み込むことができるので、大容量化、高圧冷媒使用、冷媒可逆（両流れ）仕様等に対応することができる。   In the reversible flow control valve according to the present invention, a cylindrical spring accommodating portion with a ceiling portion having a larger diameter than the first movable screw portion is provided below the first movable screw portion in the valve shaft, and the guide bush In the first fixed screw portion, a cylindrical fitting insertion portion with a ceiling portion having a larger diameter than the first fixed screw portion, into which the cylindrical spring accommodating portion is fitted, is provided. Without increasing the size of the fixed screw portion and the first and second movable screw portions, the size of the compression coil spring as the spring member that biases the valve body in the closing direction can be made larger. Therefore, a larger-sized spring member (coil spring) can be incorporated without increasing the overall size of the reversible flow control valve including the stepping motor, so that the capacity is increased, the high-pressure refrigerant is used, and the refrigerant is reversible (both flows). ) Can correspond to the specifications.

以下、本発明の可逆式流量制御弁の実施形態について図面を参照しながら説明する。
図１に、本発明に係る可逆式流量制御弁の一実施形態を示す。
図１に示される可逆式流量制御弁１０は、弁室２１、弁座２２（弁口２２ａ）、鍔状部材２３等を有し、前記弁座２２に接離するニードル状の弁体２４Ａにより冷媒の通過流量を調整する弁本体２０と、この弁本体２０に密封接合されるキャン４０と、このキャン４０の内周に所定の間隙をあけて配在されるロータ３０と、該ロータ３０を回転駆動すべくキャン４０に外嵌されたステータ５０と、を備えている。 Hereinafter, an embodiment of a reversible flow control valve of the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of a reversible flow control valve according to the present invention.
A reversible flow control valve 10 shown in FIG. 1 includes a valve chamber 21, a valve seat 22 (valve port 22a), a flange-like member 23, and the like, and a needle-like valve body 24A that contacts and separates from the valve seat 22. A valve body 20 for adjusting the flow rate of refrigerant, a can 40 hermetically sealed to the valve body 20, a rotor 30 disposed with a predetermined gap on the inner periphery of the can 40, and the rotor 30 And a stator 50 externally fitted to the can 40 for rotational driving.

前記弁本体２０の弁室２１の一側方には、冷媒としての高圧の二酸化炭素（ガス）を弁室２１に導入するための冷媒導入管６１が連結されるとともに、弁室２１の下方には、冷媒導出管６２が連結されている。   A refrigerant introduction pipe 61 for introducing high-pressure carbon dioxide (gas) as a refrigerant into the valve chamber 21 is connected to one side of the valve chamber 21 of the valve body 20, and below the valve chamber 21. Is connected to the refrigerant outlet pipe 62.

ステータ５０は、磁性材からなるヨーク５１と、このヨーク５１にボビン５２を介して巻回される上下のステータコイル５３，５３と、樹脂モールドカバー５６と、からなり、ロータ３０とステータ５０とステータコイル５３，５３とによりモータ（ここではステッピングモータ）が構成される。なお、前記キャン４０は、ステンレス等の非磁性の金属を素材として、深絞り加工等により半球状の天底４０ａを有する有底円筒状に形成されている。   The stator 50 includes a yoke 51 made of a magnetic material, upper and lower stator coils 53 and 53 wound around the yoke 51 via a bobbin 52, and a resin mold cover 56. The rotor 30, the stator 50, and the stator The coils 53 and 53 constitute a motor (here, a stepping motor). The can 40 is formed into a bottomed cylindrical shape having a hemispherical nadir 40a by deep drawing or the like using a nonmagnetic metal such as stainless steel as a raw material.

キャン４０の下端部（開口端縁部）４０ｂは、弁本体２０の上部に固着されているステンレス製の鍔状部材２３に形成された段差部２３ａに突き合わせ溶接により密封接合され、内部は気密状態に保たれている。   The lower end portion (opening edge portion) 40b of the can 40 is hermetically sealed by butt welding to a step portion 23a formed on a stainless steel flange-like member 23 fixed to the upper portion of the valve body 20, and the inside is airtight. It is kept in.

前記キャン４０内には、弁体２４ａを有するステンレス又は黄銅製の弁軸２４と、弁本体２０に設けられた嵌合穴４６にその下端部２６ａが圧入（又は螺合）固定され、前記弁軸２４が内挿されたガイドブッシュ２６と、前記弁軸２４及びガイドブッシュ２６の外周に配在され、前記ロータ３０に一体回転可能に連結された弁軸ホルダ３２と、が備えられている。   Inside the can 40, a valve shaft 24 made of stainless steel or brass having a valve body 24a and a lower end portion 26a are press-fitted (or screwed) into a fitting hole 46 provided in the valve body 20, and the valve A guide bush 26 in which a shaft 24 is inserted, and a valve shaft holder 32 disposed on the outer periphery of the valve shaft 24 and the guide bush 26 and connected to the rotor 30 so as to be integrally rotatable are provided.

前記弁体２４ａを前記弁座２２に接離させるべく、前記ガイドブッシュ２６の上端部近くの内周には第１固定ねじ部２８が形成され、また、前記弁軸２４の上部軸部の中央部外周には、前記第１固定ねじ部２８に螺合せしめられる第１可動ねじ部２９が形成されており、それら固定ねじ部２８と可動ねじ部２９とで流量調整用ねじ送り機構１１が構成されている。   A first fixing screw portion 28 is formed on the inner periphery near the upper end portion of the guide bush 26 in order to bring the valve body 24 a into and out of the valve seat 22, and the center of the upper shaft portion of the valve shaft 24. A first movable screw portion 29 screwed into the first fixed screw portion 28 is formed on the outer periphery of the portion, and the fixed screw portion 28 and the movable screw portion 29 constitute the flow rate adjusting screw feed mechanism 11. Has been.

また、前記ガイドブッシュ２６の中間部外周には第２固定ねじ部２５が形成され、前記弁軸ホルダ３２の下端部内周には、前記第２固定ねじ部２５に螺合せしめられる第２可動ねじ部３１が形成され、それら固定ねじ部２５と可動ねじ部３１とでロータ位置決め（回転規制）用ねじ送り機構１２が構成されている。   A second fixed screw portion 25 is formed on the outer periphery of the intermediate portion of the guide bush 26, and a second movable screw that is screwed to the second fixed screw portion 25 on the inner periphery of the lower end portion of the valve shaft holder 32. The fixed screw portion 25 and the movable screw portion 31 constitute the rotor positioning (rotation restriction) screw feed mechanism 12.

本実施形態では、流量調整用ねじ送り機構１１のピッチと前記回転規制用ねじ送り機構１２のピッチとが同じにされている。また、前記第１固定ねじ部２８の径は前記第２固定ねじ部３１の径の１／２以下とされている。   In the present embodiment, the pitch of the flow rate adjusting screw feed mechanism 11 and the pitch of the rotation regulating screw feed mechanism 12 are the same. Further, the diameter of the first fixing screw portion 28 is set to ½ or less of the diameter of the second fixing screw portion 31.

なお、ガイドブッシュ２６の側面には弁室２１とキャン４０内の均圧を図る均圧孔２６ｅが形成されている。   A pressure equalizing hole 26e for equalizing the pressure in the valve chamber 21 and the can 40 is formed on the side surface of the guide bush 26.

また、前記弁軸２４における第１可動ねじ部２９の下側に、該第１可動ねじ部２９より大径の天井部付き筒状ばね収容部２４ｂが設けられるとともに、前記ガイドブッシュ２６における第１固定ねじ部２８の下側に、前記筒状ばね収容部２４ｂの上部が嵌挿される、前記第１固定ねじ部２８より大径の天井部付き筒状嵌挿部２６ｂが設けられている。   Further, a cylindrical spring accommodating portion 24b with a ceiling portion having a diameter larger than that of the first movable screw portion 29 is provided below the first movable screw portion 29 in the valve shaft 24, and the first in the guide bush 26 is provided. A cylindrical fitting insertion portion 26b with a ceiling portion larger in diameter than the first fixing screw portion 28, into which the upper portion of the cylindrical spring accommodating portion 24b is fitted and inserted, is provided below the fixing screw portion 28.

前記弁軸ホルダ３２とロータ３０とは支持リング３６を介して結合されており、支持リング３６は、本実施形態ではロータ３０の成形時にインサートされた黄銅製の金属リングで構成されている。支持リング３６に弁軸ホルダ３２の上部突部がかしめ固定され、これにより、ロータ３０、支持リング３６及び弁軸ホルダ３２が一体的に連結されている。   The valve shaft holder 32 and the rotor 30 are coupled via a support ring 36, and the support ring 36 is formed of a brass metal ring inserted when the rotor 30 is formed in this embodiment. The upper protrusion of the valve shaft holder 32 is caulked and fixed to the support ring 36, whereby the rotor 30, the support ring 36, and the valve shaft holder 32 are integrally connected.

ガイドブッシュ２６には、回転規制用ストッパ機構の一方を構成する固定ストッパ２７が固着され、弁軸ホルダ３２にはストッパ機構の他方を構成する可動ストッパ３７が固着されている。   A fixed stopper 27 constituting one of the rotation regulating stopper mechanisms is fixed to the guide bush 26, and a movable stopper 37 constituting the other of the stopper mechanism is fixed to the valve shaft holder 32.

前記筒状ばね収容部２４ｂには、弁体２４ａの上部小径部２４ｄが軸方向に移動可能に挿入されるとともに、上から順次、ばね受けボール４５、コイルばね３４、及び弁体２４ａの上部小径部２４ｄに圧入等により外嵌固定された鍔状部４７ａ付き抜け止めスリーブ４７が配在されている。前記弁体２４ａに外嵌固定された抜け止めスリーブ４７は、前記筒状ばね収容部２４ｂの下端部に溶接又は圧入内嵌固定されているカラー３８（係止部材）により係止されている。前記コイルばね３４は、ばね受けボール４５と前記抜け止めスリーブ４７の鍔状部４７ａとの間に縮装されて、前記弁体２４Ａを常時下方に付勢するようになっている。   An upper small diameter portion 24d of the valve body 24a is inserted into the cylindrical spring accommodating portion 24b so as to be movable in the axial direction, and the spring receiving ball 45, the coil spring 34, and the upper small diameter of the valve body 24a are sequentially arranged from the top. A retaining sleeve 47 with a hook-like portion 47a, which is externally fitted and fixed to the portion 24d by press fitting or the like, is disposed. The retaining sleeve 47 externally fitted and fixed to the valve body 24a is locked to a lower end portion of the cylindrical spring accommodating portion 24b by a collar 38 (locking member) fixed by welding or press fitting. The coil spring 34 is contracted between the spring receiving ball 45 and the flange 47a of the retaining sleeve 47 so as to constantly urge the valve body 24A downward.

また、弁軸２４の上端部２４ｅには、図３（Ｂ）に示される如くの、Ｄカット（面取り部４２ａ）が施された回転連動用嵌挿部４２ａを持つプッシュナット４２の下部に形成されたスリーブ状部４２ｃが圧入により外嵌固定され、前記弁軸ホルダ３２の天井部３２ｃに、弁軸２４及びプッシュナット４２を一体的に連動回転させるとともに軸方向の相対移動は許容するように、前記回転連動用嵌挿部４２ａが挿入される断面非円形（Ｄ字状）の挿通穴３２ｅが形成されている。したがって、前記弁軸２４は、前記弁軸ホルダ３２と一体回転可能とされるとともに、前記弁軸ホルダ３２に対して軸方向に相対移動可能とされている。   Further, the upper end portion 24e of the valve shaft 24 is formed at the lower portion of the push nut 42 having the rotation interlocking insertion portion 42a provided with the D cut (the chamfered portion 42a) as shown in FIG. The formed sleeve-like portion 42c is fitted and fixed by press-fitting, and the valve shaft 24 and the push nut 42 are integrally interlocked with the ceiling portion 32c of the valve shaft holder 32, and relative movement in the axial direction is allowed. A through hole 32e having a non-circular cross section (D shape) into which the rotation interlocking insertion portion 42a is inserted is formed. Therefore, the valve shaft 24 can rotate integrally with the valve shaft holder 32 and can move relative to the valve shaft holder 32 in the axial direction.

なお、プッシュナット４２のＤカットは、１８０°反対位置に平坦面を設けた２面軸として前記弁軸ホルダ側の穴は、スロット状の長穴又は複数個の穴の組合せとしても良い。   Note that the D cut of the push nut 42 may be a two-surface shaft provided with a flat surface at a position opposite to 180 °, and the hole on the valve shaft holder side may be a slot-like long hole or a combination of a plurality of holes.

本実施形態では、前記弁軸２４、前記プッシュナット４２、前記弁軸ホルダ３２、及び前記ガイドブッシュ２６等の組立時の便宜を図るべく、前記ガイドブッシュ２６の第１固定ねじ部２８に前記弁軸の第１可動ねじ部２９を螺合させるとともに、前記ガイドブッシュ２６の第２固定ねじ部２５に前記弁ホルダ３２の第２可動ねじ部３１を螺合させた状態で、前記プッシュナット４２のスリーブ状部４２ｃを前記弁軸２４の上端部２４ｅに上から押し込むようにして圧入する際には、必ず、その圧入より先に前記回転連動用嵌挿部４２ａの一部が前記弁ホルダ３２の挿通穴３２ｅに挿入されている状態となるように、各部の寸法が設定されている。   In this embodiment, the valve shaft 24, the push nut 42, the valve shaft holder 32, the guide bush 26, and the like are provided with the valve on the first fixing screw portion 28 of the guide bush 26 for the convenience of assembly. While the first movable screw portion 29 of the shaft is screwed together and the second movable screw portion 31 of the valve holder 32 is screwed to the second fixed screw portion 25 of the guide bush 26, the push nut 42 When the sleeve-like portion 42c is press-fitted into the upper end portion 24e of the valve shaft 24 from above, a part of the rotation interlocking insertion portion 42a is always inserted into the valve holder 32 before the press-fitting. The dimension of each part is set so that it may be in the state inserted in the insertion hole 32e.

また、本実施形態では、図２に示される如くに、前記弁軸ホルダ３２が回転しながら上動せしめられるとき、第２固定ねじ部２５から第２可動ねじ部３１がねじ抜けするより先に、筒状ばね収容部２４ａの天井部２４ｆが前記筒状嵌挿部２６ａの天井部２６ｂに当接してその回転上動を阻止するようにされている。   Further, in the present embodiment, as shown in FIG. 2, when the valve shaft holder 32 is moved upward while rotating, the second movable screw portion 31 is unscrewed from the second fixed screw portion 25. The ceiling portion 24f of the cylindrical spring accommodating portion 24a is in contact with the ceiling portion 26b of the cylindrical fitting insertion portion 26a to prevent the rotational movement thereof.

このような構成とされた可逆式流量制御弁１０にあっては、弁体２４ａが弁座２２から離れて（リフトして）いる状態（弁口２２ａが開状態）で、ステータコイル５３，５３に第１態様で通電を行って励磁すると、弁本体２０に固定されたガイドブッシュ２６に対し、ロータ３０及び弁軸ホルダ３２が一方向に回転し、ロータ位置決め用のねじ送り機構１２により弁軸ホルダ３２が１回転につき所定距離ずつ下動するとともに、流量調整用ねじ送り機構１１により弁軸２４が１回転につき所定距離ずつ下降し、弁体２４Ａが弁座２２に着座圧接して弁口２２ａが閉じられる。   In the reversible flow control valve 10 having such a configuration, the stator coils 53 and 53 are in a state where the valve body 24a is separated (lifted) from the valve seat 22 (the valve port 22a is open). When energized in the first mode, the rotor 30 and the valve shaft holder 32 rotate in one direction with respect to the guide bush 26 fixed to the valve body 20, and the valve shaft is rotated by the screw feed mechanism 12 for rotor positioning. While the holder 32 is moved downward by a predetermined distance per rotation, the valve shaft 24 is lowered by a predetermined distance per rotation by the flow rate adjusting screw feed mechanism 11, and the valve body 24A is seated and pressed against the valve seat 22 to thereby open the valve port 22a. Is closed.

弁口２２ａが閉じられた時点では、弁軸ホルダ３２の下端に設けられた可動ストッパ３７は未だ弁本体２０側に固定された固定ストッパ２７に当接しておらず、弁体２４ａが弁口２２ａを閉じたままロータ３０及び弁軸ホルダ３２はさらに回転しながら下動するとともに、前記弁軸２４も下動する。このときは、弁体２４ａに対して弁軸２４が下動するため、弁軸２４と弁体２４ａとの間に配在されたコイルばね３４が圧縮され、これにより、弁軸２４の下動力は吸収される。その後、ロータ３０がさらに回転して弁軸ホルダ３２が下動すると、可動ストッパ３７が固定ストッパ２７に当接し、ステータコイル５３，５３に対する通電が続行されても弁軸ホルダ３２及び弁軸２４の回転及び下降が強制的に停止せしめられる。   When the valve port 22a is closed, the movable stopper 37 provided at the lower end of the valve shaft holder 32 is not yet in contact with the fixed stopper 27 fixed to the valve body 20 side, and the valve body 24a is not in contact with the valve port 22a. While the rotor is closed, the rotor 30 and the valve shaft holder 32 further move downward while rotating, and the valve shaft 24 also moves downward. At this time, since the valve shaft 24 moves downward with respect to the valve body 24a, the coil spring 34 arranged between the valve shaft 24 and the valve body 24a is compressed. Is absorbed. Thereafter, when the rotor 30 further rotates and the valve shaft holder 32 moves downward, the movable stopper 37 comes into contact with the fixed stopper 27, and even if energization to the stator coils 53, 53 is continued, the valve shaft holder 32 and the valve shaft 24 are moved. The rotation and lowering are forcibly stopped.

かかる停止状態から、ステータコイル５３，５３に他方向の通電を行って励磁すると、ガイドブッシュ２６に対し、ロータ３０、弁軸ホルダ３２、及び弁軸２４が前記と逆方向に回転し、前記ねじ送り機構１２により、今度は弁軸ホルダ３２が１回転につき所定距離ずつ上動して可動ストッパ３７が固定ストッパ２７から離間するとともに、前記ねじ送り機構１１により、弁軸２４が１回転につき所定距離ずつ上動し、弁体２４ａが弁座２２から離れて弁口２２ａが開かれ、導入管６１から弁室２１に導入された冷媒が弁口２２ａを通過して導出管６２に流出し、弁体２４ａのリフト量に応じて冷媒の通過流量が調整される。   When the stator coils 53, 53 are energized in the other direction from this stopped state, the rotor 30, the valve shaft holder 32, and the valve shaft 24 rotate in the opposite direction to the guide bush 26, and the screw The feed mechanism 12 causes the valve shaft holder 32 to move up by a predetermined distance per rotation to move the movable stopper 37 away from the fixed stopper 27, and the screw feed mechanism 11 causes the valve shaft 24 to move a predetermined distance per rotation. The valve body 24a moves away from the valve seat 22 and the valve port 22a is opened. The refrigerant introduced into the valve chamber 21 from the inlet pipe 61 passes through the valve port 22a and flows out to the outlet pipe 62. The flow rate of the refrigerant is adjusted according to the lift amount of the body 24a.

このように、本実施形態では、弁軸２４における第１可動ねじ部２９の下側に、該第１可動ねじ部２９より大径の筒状ばね収容部２４ｂが設けられるとともに、前記ガイドブッシュ２６における第１固定ねじ部２８の下側に、前記筒状ばね収容部２４ｂが嵌挿される、前記第１固定ねじ部２８より大径の筒状嵌挿部２６ｂが設けられるので、第１及び第２固定ねじ部２８、２５並びに第１及び第２可動ねじ部２９、３１のサイズを大きくすることなく、弁体２４ａを閉方向に付勢するばね部材としての圧縮コイルばね３４のサイズをより大きなものとすることができる。そのため、ステッピングモータを含む可逆式流量制御弁全体の大型化を招くことなく、より大きなサイズのばね部材（コイルばね）を組み込むことができるので、大容量化、高圧冷媒使用、冷媒可逆（両流れ）仕様等に対応することができる。   As described above, in the present embodiment, the cylindrical spring accommodating portion 24b having a larger diameter than the first movable screw portion 29 is provided below the first movable screw portion 29 in the valve shaft 24, and the guide bush 26 is provided. Since a cylindrical fitting insertion portion 26b having a larger diameter than the first fixing screw portion 28 is provided on the lower side of the first fixing screw portion 28, the cylindrical spring accommodating portion 24b is fitted and inserted. (2) The size of the compression coil spring 34 as a spring member for biasing the valve body 24a in the closing direction is increased without increasing the size of the fixed screw portions 28, 25 and the first and second movable screw portions 29, 31. Can be. Therefore, a larger-sized spring member (coil spring) can be incorporated without increasing the overall size of the reversible flow control valve including the stepping motor, so that the capacity is increased, the high-pressure refrigerant is used, and the refrigerant is reversible (both flows). ) Can correspond to the specifications.

なお、上記実施形態においては、ガイドブッシュ２６の筒状嵌挿部２６ａが弁軸２４の筒状ばね収容部２４ｂのガイドをしていたが、それに代えて、図５に示される如くに、前記弁本体２０に前記弁軸２４の筒状ばね収容部２４ｂが摺動自在に嵌挿される弁軸ガイド部２０ｃを設けてもよい。前記ガイドブッシュ２６は弁本体２０に圧入等で取り付けられるものなので、弁座（弁口）２２に対して芯ずれを起こしやすいが、弁軸ガイド部２０ｃを弁本体２０に設けることで、かかる芯ずれを生じないようにできる。なお、この場合は、ガイドブッシュ２６の筒状嵌挿部２６ａを若干大径にしてガイドとしては機能しないようにされる。   In the above embodiment, the cylindrical fitting insertion portion 26a of the guide bush 26 guides the cylindrical spring accommodating portion 24b of the valve shaft 24. Instead, as shown in FIG. The valve main body 20 may be provided with a valve shaft guide portion 20c into which the cylindrical spring accommodating portion 24b of the valve shaft 24 is slidably inserted. Since the guide bush 26 is attached to the valve body 20 by press fitting or the like, the guide bush 26 is likely to be misaligned with respect to the valve seat (valve port) 22. However, by providing the valve body guide 20 c on the valve body 20, It is possible to prevent deviation. In this case, the cylindrical fitting insertion portion 26a of the guide bush 26 is slightly larger in diameter so that it does not function as a guide.

また、上記実施形態では、第２固定ねじ部２５から第２可動ねじ部３１がねじ抜け防止を、前記弁軸ホルダ３２が回転しながら上動せしめられるとき、第２固定ねじ部２５から第２可動ねじ部３１がねじ抜けするより先に、筒状ばね収容部２４ｂの天井部２４ｆが前記筒状嵌挿部２６ａの天井部２６ａに衝接してその回転上動を阻止することでおこなっているが、それに代えて、図６に示される如くに、前記弁軸ホルダ３２の天井部３２ｃ上にコイルばね４８を搭載保持するとともに、該コイルばね４８の下部内周に前記プッシュナット４２の上部を延設して挿入し（抜け落ち防止）、前記弁ホルダ３２が許容最大上動位置を越えてさらに上動しようとする際には、前記コイルばね４８の上端が前記キャン４０の天井部４０ａに圧接して、該コイルばね４８と前記キャン４０、前記弁軸ホルダ３２、及び前記プッシュナット４２等との間の摩擦トルク及び前記コイルばね４８のねじりトルクをロータ回転トルクよりも大きく設定することにより、前記弁軸ホルダ３２の回転上動を阻止するようにしてもよい。   Further, in the above embodiment, when the second movable screw portion 31 is prevented from being unscrewed from the second fixed screw portion 25 and the valve shaft holder 32 is moved upward while rotating, the second fixed screw portion 25 is moved to the second fixed screw portion 25. Before the movable screw portion 31 is unscrewed, the ceiling portion 24f of the cylindrical spring accommodating portion 24b abuts against the ceiling portion 26a of the cylindrical fitting insertion portion 26a to prevent its upward rotation. Instead, as shown in FIG. 6, a coil spring 48 is mounted and held on the ceiling portion 32 c of the valve shaft holder 32, and the upper portion of the push nut 42 is attached to the lower inner periphery of the coil spring 48. When the valve holder 32 tries to move upward beyond the allowable maximum upward movement position, the upper end of the coil spring 48 is pressed against the ceiling 40 a of the can 40. And the By setting the friction torque between the coil spring 48 and the can 40, the valve shaft holder 32, the push nut 42 and the like and the torsion torque of the coil spring 48 larger than the rotor rotational torque, the valve shaft holder You may make it prevent 32 rotation up movement.

また、前記筒状ばね収容部２４ｂ内の構成としては、図４（Ａ）に示される如くに、抜け止め用の鍔状部２４ｉを弁体２４ａに一体に設けるようにしてもよい。また、図４（Ｂ）に示される如くに、前記筒状ばね収容部２４ｂ内に、上から順次、前記ばね部材としての圧縮コイルばね３４、実質的に点接触となる曲面部を持つ曲面ばね受け部材（ここでは球状のボール４５）を配在するようにしてもよい。この場合、弁体２４ａ及び曲面ばね受け部材４５に硬質めっき又は低摩擦めっきを施すか、あるいは、弁体のみに硬質めっき又は低摩擦めっきを施すことにより、摩擦抵抗を大幅に低減できる。なお、硬質めっき、低摩擦めっき法としては、金属素材にＰＴＦＥ（ポリテトラフルオロエチレン）を無電解めっき（コーティング）すること等が挙げられる。   Moreover, as a structure in the said cylindrical spring accommodating part 24b, as shown to FIG. 4 (A), you may make it provide the valve-shaped part 24i integrally in the valve body 24a. Further, as shown in FIG. 4B, in the cylindrical spring accommodating portion 24b, in order from the top, a compression coil spring 34 as the spring member, a curved spring having a curved surface portion that is substantially in point contact. You may make it arrange | position a receiving member (here spherical ball 45). In this case, the frictional resistance can be greatly reduced by applying hard plating or low friction plating to the valve body 24a and the curved spring receiving member 45, or by applying hard plating or low friction plating only to the valve body. Examples of hard plating and low friction plating include electroless plating (coating) of PTFE (polytetrafluoroethylene) on a metal material.

本発明に係る可逆式流量制御弁の一実施形態を示す縦断面図。1 is a longitudinal sectional view showing an embodiment of a reversible flow control valve according to the present invention. 図１に示される可逆式流量制御弁の動作説明に供される図。The figure which is provided for operation | movement description of the reversible type flow control valve shown by FIG. 図１に示される可逆式流量制御弁の組立時の説明に供される図。The figure which is provided for description at the time of the assembly of the reversible flow control valve shown in FIG. 図１に示される可逆式流量制御弁の筒状ばね収容部内の他の構成例を示す図。The figure which shows the other structural example in the cylindrical spring accommodating part of the reversible flow control valve shown by FIG. 図１に示される可逆式流量制御弁の他の変形例の説明に供される図。The figure which is provided for description of the other modification of the reversible flow control valve shown in FIG. 図１に示される可逆式流量制御弁の別の変形例の説明に供される図。The figure which is provided for description of another modification of the reversible flow control valve shown in FIG.

符号の説明Explanation of symbols

１０ 可逆式流量制御弁
１１ 流量調整用ねじ送り機構
１２ 回転規制用ねじ送り機構
２０ 弁本体
２１ 弁室
２２ 弁座
２２ａ 弁口
２４ 弁軸
２４Ａ 弁体
２４Ｂ 筒状ばね収容部
２５ 第２固定ねじ部
２６ ガイドブッシュ
２６ａ 筒状嵌挿部
２７ 固定ストッパ
２８ 第１固定ねじ部
３０ ロータ
２９ 第１可動ねじ部
３１ 第２可動ねじ部
３２ 弁軸ホルダ
３４ コイルばね
３７ 可動ストッパ
４０ キャン
４２ プッシュナット
５０ ステータ DESCRIPTION OF SYMBOLS 10 Reversible flow control valve 11 Flow adjustment screw feed mechanism 12 Rotation restriction screw feed mechanism 20 Valve body 21 Valve chamber 22 Valve seat 22a Valve port 24 Valve shaft 24A Valve body 24B Cylindrical spring accommodating portion 25 Second fixed screw portion 26 Guide bush 26a Cylindrical insertion portion 27 Fixed stopper 28 First fixed screw portion 30 Rotor 29 First movable screw portion 31 Second movable screw portion 32 Valve shaft holder 34 Coil spring 37 Movable stopper 40 Can 42 Push nut 50 Stator

Claims (11)

弁体を有する弁軸と、前記弁体が接離する弁座を有する弁本体と、該弁本体に接合されたキャンと、該キャンの内周に配在されたロータと、該ロータを回転駆動すべく前記キャンの外周に配在されたステータと、前記弁本体に固定されるとともに前記弁軸が内挿されたガイドブッシュと、前記弁軸及びガイドブッシュの外周に配在されて前記ロータに一体回転可能に連結された弁軸ホルダとを備え、前記弁軸は、前記弁軸ホルダと一体回転可能とされるとともに、前記弁軸ホルダに対して軸方向に相対移動可能とされ、かつ、前記弁体を前記弁座に接離させるべく、前記ガイドブッシュの内周に形成された第１固定ねじ部及び前記弁軸の外周に形成されて前記第１固定ねじ部に螺合せしめられる第１可動ねじ部とからなる流量調整用ねじ送り機構が設けられるとともに、前記ガイドブッシュの外周に形成された第２固定ねじ部及び前記弁軸ホルダの内周に形成されて前記第２固定ねじ部に螺合せしめられる第２可動ねじ部とからなるロータ位置決め用ねじ送り機構が設けられており、
前記弁軸における第１可動ねじ部の下側に、該第１可動ねじ部より大径の天井部付き筒状ばね収容部が設けられるとともに、前記ガイドブッシュにおける第１固定ねじ部の下側に、前記筒状ばね収容部が嵌挿される、前記第１固定ねじ部より大径の天井部付き筒状嵌挿部が設けられ、前記弁体は、前記筒状ばね収容部に軸方向に移動可能に嵌挿されるとともに、前記筒状ばね収容部に設けられた係止部により抜け止め係止され、かつ、前記筒状ばね収容部には、前記弁体を下方に付勢するばね部材が収容されていることを特徴とする可逆式流量制御弁。 A valve body having a valve body; a valve body having a valve seat to which the valve body comes in contact with and separating; a can joined to the valve body; a rotor disposed on an inner periphery of the can; and rotating the rotor A stator disposed on the outer periphery of the can for driving, a guide bush fixed to the valve body and having the valve shaft inserted therein, and a rotor disposed on the outer periphery of the valve shaft and the guide bush. A valve shaft holder connected to the valve shaft holder so as to be integrally rotatable with the valve shaft holder, the valve shaft being rotatable together with the valve shaft holder, and being relatively movable in the axial direction with respect to the valve shaft holder, and In order to bring the valve body into and out of contact with the valve seat, a first fixing screw portion formed on the inner periphery of the guide bush and an outer periphery of the valve shaft are screwed onto the first fixing screw portion. Screw feed for flow rate adjustment consisting of the first movable screw part And a second fixed screw portion formed on the outer periphery of the guide bush and a second movable screw portion formed on the inner periphery of the valve shaft holder and screwed onto the second fixed screw portion. A rotor positioning screw feed mechanism is provided,
A cylindrical spring accommodating portion with a ceiling portion having a larger diameter than the first movable screw portion is provided below the first movable screw portion in the valve shaft, and below the first fixed screw portion in the guide bush. A cylindrical fitting insertion portion with a ceiling portion larger in diameter than the first fixing screw portion is provided, and the valve body moves in the axial direction to the cylindrical spring accommodation portion. A spring member that is inserted into the tubular spring accommodating portion and is latched by a retaining portion provided in the cylindrical spring accommodating portion, and urges the valve body downward in the cylindrical spring accommodating portion. A reversible flow control valve characterized by being housed. 前記流量調整用ねじ送り機構のピッチと前記回転規制用ねじ送り機構のピッチとが同じにされていることを特徴とする請求項１に記載の可逆式流量制御弁。   The reversible flow control valve according to claim 1, wherein a pitch of the screw feed mechanism for flow rate adjustment and a pitch of the screw feed mechanism for rotation restriction are the same. 前記弁軸ホルダが回転しながら上動せしめられるとき、前記第２固定ねじ部から前記第２可動ねじ部がねじ抜けするより先に、前記筒状ばね収容部の天井部が前記筒状嵌挿部の天井部に衝接してその回転上動を阻止するようにされていることを特徴とする請求項１に記載の可逆式流量制御弁。   When the valve shaft holder is rotated upward while rotating, the ceiling portion of the cylindrical spring accommodating portion is inserted into the cylindrical insertion portion before the second movable screw portion is unscrewed from the second fixed screw portion. 2. The reversible flow control valve according to claim 1, wherein the reciprocating flow control valve is configured to abut against a ceiling portion of the portion to prevent the rotational movement thereof. 前記第１固定ねじ部の径は前記第２固定ねじ部の径の１／２以下とされていることを特徴とする請求項１に記載の可逆式流量制御弁。   2. The reversible flow control valve according to claim 1, wherein a diameter of the first fixing screw portion is equal to or less than ½ of a diameter of the second fixing screw portion. 前記弁本体に前記弁軸の筒状ばね収容部が摺動自在に嵌挿される弁軸ガイド部が設けられていることを特徴とする請求項１に記載の可逆式流量制御弁。   The reversible flow control valve according to claim 1, wherein a valve shaft guide portion into which a tubular spring accommodating portion of the valve shaft is slidably fitted is provided in the valve body. 前記弁軸の上端部に、断面非円形の回転連動用嵌挿部を持つプッシュナットの下部に形成れさたスリーブ状部が圧入により外嵌固定され、前記弁軸ホルダの天井部に、前記弁軸及びプッシュナットを一体的に連動回転させるとともに軸方向の相対移動は許容するように、前記回転連動用嵌挿部が挿入される断面非円形の挿通穴が形成されていることを特徴とする請求項１に記載の可逆式流量制御弁。   At the upper end of the valve shaft, a sleeve-like portion formed at the lower portion of the push nut having a rotation interlocking insertion portion having a non-circular cross-section is fitted and fixed by press fitting, and the ceiling portion of the valve shaft holder is An insertion hole having a non-circular cross section is formed to insert the rotation interlocking insertion portion so that the valve shaft and the push nut are integrally interlocked to rotate and allow relative movement in the axial direction. The reversible flow control valve according to claim 1. 前記弁軸、前記プッシュナット、前記弁軸ホルダ、及び前記ガイドブッシュ等の組立時の便宜を図るべく、前記ガイドブッシュの第１固定ねじ部に前記弁軸の第１可動ねじ部を螺合させるとともに、前記ガイドブッシュの第２固定ねじ部に前記弁ホルダの第２可動ねじ部を螺合させた状態で、前記プッシュナットのスリーブ状部を前記弁軸の上端部に上から押し込むようにして圧入する際には、その圧入より先に前記回転連動用嵌挿部の一部が前記弁ホルダの挿通穴に挿入されている状態となるように、各部の寸法が設定されていることを特徴とする請求項６に記載の可逆式流量制御弁。   In order to facilitate the assembly of the valve shaft, the push nut, the valve shaft holder, the guide bush, and the like, the first movable screw portion of the valve shaft is screwed into the first fixed screw portion of the guide bush. In addition, the sleeve-like portion of the push nut is pushed into the upper end portion of the valve shaft from above with the second movable screw portion of the valve holder screwed into the second fixed screw portion of the guide bush. When press-fitting, the dimensions of the respective parts are set so that a part of the rotation interlocking insertion part is inserted into the insertion hole of the valve holder prior to the press-fitting. The reversible flow control valve according to claim 6. 前記弁軸ホルダの天井部上にコイルばねが配在されるとともに、該コイルばねの下部内周に前記プッシュナットの上部が挿入され、前記弁ホルダが許容最大上動位置を越えてさらに上動しようとする際には、前記コイルばねの上端が前記キャンの天井部に圧接して、該コイルばねと前記キャン、前記弁軸ホルダ、及び前記プッシュナット等との間の摩擦トルク及び前記コイルばねのねじりトルクにより、前記弁軸ホルダの回転上動が阻止されるように構成されていることを特徴とする請求項６に記載の可逆式流量制御弁。   A coil spring is arranged on the ceiling portion of the valve shaft holder, and the upper part of the push nut is inserted into the lower inner periphery of the coil spring, so that the valve holder moves further upward beyond the allowable maximum upward movement position. When trying to do so, the upper end of the coil spring is pressed against the ceiling of the can, and the friction torque between the coil spring and the can, the valve shaft holder, the push nut, etc., and the coil spring The reversible flow control valve according to claim 6, wherein the valve shaft holder is prevented from rotating upward by a torsional torque. 前記筒状ばね収容部内に、前記ばね部材としての圧縮コイルばねが配在されるとともに、該圧縮コイルばねと前記弁体との間に、実質的に点接触となる曲面部を持つ曲面ばね受け部材が介装されていることを特徴とする請求項１に記載の可逆式流量制御弁。   A curved spring holder having a curved surface portion that is substantially point-contacted between the compression coil spring and the valve body, and a compression coil spring as the spring member is disposed in the cylindrical spring housing portion. 2. The reversible flow control valve according to claim 1, wherein a member is interposed. 前記弁体及び曲面ばね受け部材に硬質めっき又は低摩擦めっき、あるいは、弁体のみに硬質めっき又は低摩擦めっきを施すことを特徴とする請求項９に記載の可逆式流量制御弁。   The reversible flow control valve according to claim 9, wherein the valve body and the curved spring receiving member are subjected to hard plating or low friction plating, or only the valve body is subjected to hard plating or low friction plating. 前記ガイドブッシュもしくは弁本体に設けられた固定ストッパと、前記弁軸ホルダに設けられ前記固定ストッパに衝接可能とされた可動ストッパと、からなるロータ位置決め用ストッパ機構を備えていることを特徴とする請求項１に記載の可逆式流量制御弁。   A rotor positioning stopper mechanism comprising a fixed stopper provided on the guide bush or the valve body and a movable stopper provided on the valve shaft holder and capable of contacting the fixed stopper. The reversible flow control valve according to claim 1.
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