JP4205901B2

JP4205901B2 - Electric switching valve

Info

Publication number: JP4205901B2
Application number: JP2002185247A
Authority: JP
Inventors: 伸一根本; 薫小柳津; 哲也青木
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 2002-06-25
Filing date: 2002-06-25
Publication date: 2009-01-07
Anticipated expiration: 2022-06-25
Also published as: CN1467397A; JP2004028205A; CN1329681C

Description

【０００１】
【発明の属する技術分野】
本発明は、空気調和機等に組み込まれて使用される電動切換え弁に係り、特に、電動切換え弁を流れる流体が、流れ方向が正逆に拘わらず、同一流量とすることができる電動切換え弁に関する。
【０００２】
【従来の技術】
従来、この種の空気調和機、冷凍機等に組み込まれて使用される電動弁は、冷媒等の流体の流量を調整する機器であり、通常、弁室および弁座を備えた弁本体と、鍔状部を介して前記弁本体の上部に固着された有底円筒状のキャンとを備えており、該キャンの内側にはロータが内蔵され、前記キャンの外部には中央部に挿通孔を有するステータが外嵌されている。
図６は、前記したような従来の電動弁１の縦断面図を示しており、弁本体２は弁室２ｃと、ガイドブッシュ固定部２ｄと、キャン固着部２ｅとを備え、弁室２ｃには冷媒等の流体が出入する流体入出管２ａ、２ｂが設けられるとともに、その内部には弁軸３の先端に形成された弁体３ａであるニードル弁が接離する弁座２ｆが配設されている。
【０００３】
前記ガイドブッシュ固定部２ｄは、弁室の上方に位置し、弁本体２とガイドブッシュ４とを固定する。該ガイドブッシュ４の内周には雌ねじ部４ａが形成され、該雌ねじ部４ａには弁体ホルダ５の外周に形成された雄ねじ部５ａが螺合され、雌ねじ部と雄ねじ部とによりねじ送り機構が構成されている。
そして、この弁体ホルダ５内には、下端部に弁体３ａを形成している弁軸３が摺動可能に嵌挿されており、該弁軸３は弁体ホルダ内５に縮装された圧縮コイルばね３ｂによって常時下方に付勢されている。
【０００４】
キャン固着部２ｅは弁本体２の上端に位置し、内周面をかしめ固定されるとともに下端面を溶接により接合されているリング状金属板で構成され、その外周部にてキャン６の鍔状部と溶接され弁本体２にキャン６を固定している。弁軸３とロータ７との結合は、弁軸３に弁体ホルダ５と雄ねじ部５ａを外嵌させるとともに、これを永久磁石付きのロータ７に内嵌させることによって行われている。
弁軸３の上端にはプッシュナット３ｃが圧入固定され、その鍔部が弁軸３に若干の上下動を許容してロータ７に結合している。弁体ホルダ５に固定される下ストッパ４ｂとスリーブに形成される上ストッパ５ｂとによりストッパ機構が構成される。
【０００５】
キャン６の内部にはロータ７が内蔵され、キャン６の外部にはステータ８が外嵌されている。ステータ８の内部には上下にステータコイル８ａおよびヨーク８ｂが格納されており、ステータコイル８ａはリード線８ｃおよびステータ８の外周に設けられたコネクタ８ｄを通じて通電される。ステータコイル８ａの通電によりヨーク８ｂが励磁されてロータ７を回転させ、ねじ送り機構により弁体ホルダ５と弁軸３を摺動させることによりを開閉作動させて冷媒の流量の調整を行っている。ステータ８にはコネクタのカバー８ｅが溶着されている。
【０００６】
【発明が解決しようとする課題】
ところで、上記の従来技術においては、冷媒の正・逆の流れの方向により、弁体３ａに対する冷媒圧に差が出てきて、結果として、冷媒の流れの方向により流量に差が出てくるという不具合がある。
即ち、図６において、冷媒が、流体入出管２ａから流体入出管２ｂに流れる場合には、弁体３ａに対して冷媒圧は下方向に作用するため、ねじ送り機構のバックラッシュによって常に下方向の位置にあるので、弁本体２との隙間が小さい。これに対して、流体入出管２ｂから流体入出管２ａに流れる場合には、弁体３ａに対して冷媒圧は上方向に作用するため、ねじ送り機構のバックラッシュによって常に上方向の位置となるため、弁本体２との隙間が大きくなって、その分流量を大きくしてしまうという不具合がある。
【０００７】
本発明は、このような不具合に鑑みてなされたものであって、その課題とするところは、電動切換え弁を流れる冷媒等の流体が、正逆の流れ方向に拘わらず、同一流量とすることができる電動切換え弁を提供することにある。また、このような電動切換え弁において、流体（冷媒）の電動切換え弁内通過時における騒音の低減化を図ることができる電動切換え弁に関する。
【０００８】
【課題を解決するための手段】
前記課題を達成すべく本発明に係る電動切換え弁は、下記の手段からなるものである。
請求項１記載の電動切換え弁は、弁室内の弁体により流体の通過流量を調整する弁本体と、該弁本体に固着され前記弁体を作動させるロータを内蔵するキャンと、該キャンに外嵌され前記ロータを回転駆動するステータとを備えた電動切換え弁であって、前記弁体は、回転可能とし、流体の流れ方向が正逆いずれに拘わらず、流量が略同一となるように構成され、前記弁本体は円盤状部材からなり、該円盤状部材の中心部周辺に第１連通孔と第２連通孔とが穿設されると共に、前記円盤状部材のキャン側に、回転して前記第１連通孔と第２連通孔とを選択的に閉止する位置、及び、前記第１連通孔と第２連通孔の両方とも閉止しない位置とに移動可能に前記弁体が配置され、更に、前記円盤状部材の前記弁体を配置した側とは反対側の各連通孔に、第１流路と第２流路とを装着させ、前記弁体にはオリフィスを穿設したオリフィス形成部を形成すると共に、少なくとも前記オリフィス形成部の流体流入側に多孔質部材を配置し、前記弁本体には流体入出管が連結されて前記第１流路と第２流路を形成する共に、そのうち流体流入側となる流路を構成する流体入出管の流出側端部が前記オリフィスより上に位置するように構成したことを特徴とする。
【０００９】
請求項２記載の電動切換え弁は、請求項１記載の電動切換え弁において、前記流体入出管が曲げられて前記弁室内の端部が前記オリフィスより上に位置することを特徴とする。
請求項３記載の電動切換え弁は、請求項１又は２記載の電動切換え弁において、前記流体入出管が分割されて前記弁本体に連結されていることを特徴とする。
【００１０】
請求項４記載の電動切換え弁は、請求項１から３のいずれかに記載の電動切換え弁において、多孔質部材として、オリフィス形成部の両側に第１多孔質部材及び第２多孔質部材を配置したことを特徴とする。
請求項５記載の電動切換え弁は、請求項１から４のいずれかに記載の電動切換え弁において、弁体の駆動部として、プラスチックマグネットからなるロータと回転軸と駆動部とを一体化して形成したことを特徴とする。
【００１１】
請求項６記載の電動切換え弁は、請求項１から５のいずれかに記載の電動切換え弁において、弁体は、前記多孔質部材と前記オリフィス形成部とを一体化すると共にシート部を形成したことを特徴とする。
請求項７記載の電動切換え弁は、請求項６記載の電動切換え弁において、前記弁体は、該弁体と一体化された弁体駆動体により回転されることを特徴とする。
【００１２】
請求項８記載の電動切換え弁は、請求項１に記載の電動切換え弁において、弁本体を２枚に分離し、上方の部材には弁体のストッパと弁座とを具備させ、下方の弁本体基部には前記流体出入管の継手部を形成して一体化したことを特徴とする。
【００１３】
そして、このように構成された電動切換え弁は、冷媒等の流体の流れが正・逆いずれの方向であっても漏れ量が略同一となるため、冷媒の流路を切り換える空調機等において正確な流量制御の実現が可能となる。また、上記機能に加えて流体の流れが正・逆いずれの方向であっても、流体圧が弁体を弁本体に押圧するようにしているから、弁室から流路への流体の漏れが僅少となる。また、電動切換え弁から、流体の流動に伴う騒音が低減される。
【００１４】
【発明の実施の形態】
本発明に係る電動切換え弁１００の実施形態について詳細に説明する。図１は本発明に係る電動切換え弁１００の基本構成の最小流量時の状態を示す縦断面図であり、図２は図１のＡ−Ａ断面矢視図である。
【００１５】
電動切換え弁１００は、弁本体９００と、弁本体９００に溶接により固定されるキャン４００と、キャン４００内に設置されるロータ３００と、ロータ３００により弁室１１０内で回転する弁体２００と、キャン４００に外嵌されカップ状のロータ３００を回転駆動するステータ５００とを備えている。ロータ３００とステータ５００によりステッピングモータを構成している。
【００１６】
ロータ３００は、後述のキャン４００に内装されるように外周面が円筒状で全体としてプラスチックマグネットからなる略カップ状であり、そのロータ３００の底部６００に回転軸８００が挿入され、固定されている。そして、該底部６００に弁体２００を駆動する駆動部８１０が一体に形成されている。
【００１７】
弁体２００は、図１に示すように、例えば黄銅製の円筒状の弁部材２２０と、該弁部材２２０に一体に設けられてオリフィス２２４を形成したオリフィス形成部２２５となる板状の部材と、オリフィス２２４に冷媒が流入する上流側に設けられた多孔質部材２２６及び弁部材２２０の周縁に一体に形成された弁シート部２２８とからなる。
【００１８】
なお、図１では、オリフィス２２４から冷媒が流出する下流側に多孔質部材２２３を設けた場合を示し、これらの多孔質部材は、オリフィス形成部２２５と所定の間隔を設けて配置され、例えばカシメ固定により弁部材２２０に設けられている。これらの多孔質部材２２６，２２３は、ニッケル、銅などを主成分とした発泡金属を円盤状に形成するか或いは発泡樹脂を円盤状に形成して構成される。更には、ステンレス、シンチュウ、鉄、アルミ等の金属の糸を編んで円盤状に形成したメッシュ状の金網部材、例えば東亜鉄網株式会社製の商品名「アキュームメッシュ」を用いてもよい。
【００１９】
弁体２００は、例えば合成樹脂製の弁体駆動体２１０により回転され、その弁シート部２２８が後述する弁本体９００の弁座上を摺動する。弁体駆動体２１０は、平面視方形状により形成されており、弁体駆動体２１０はこれと一体に設けられた連結部材２１２が弁部材２２０の円周表面上の溝２２０ａに係合され、弁体駆動体２１０は、弁体２００と一体に構成される。しかして、弁体２００は、図２に示すように平面視円形に形成され、弁体駆動体２１０は、平面視略方形状に形成され，両者は連結部材２１２により一体化される。
【００２０】
弁体駆動体２１０はその中央部において回転軸８００に遊嵌されている。弁体駆動体２１０には前後２枚の係合部材２１１、２１１が立設され、両係合部材２１１は回転軸８００側にロータ３００の底部に一体に下垂板として形成された駆動部８１０を挟むように配置されている。また、弁体駆動体２１０は、駆動部８１０とはある程度上下動可能なように遊嵌されている。なお、駆動部８１０は、図１のように側面視方形状である。また、駆動部８１０の下面と弁体駆動体２１０の上面との間には、ばね８２０が縮装されている。
【００２１】
キャン４００は、ステンレス等の非磁性の金属から形成される有底円筒状部分４００ａと、この部分の開口部に同軸状に第１の開口部４００ｃが溶接により固定される略スカート状の部分４００ｂとからなり、その部分の開口４００ｄは弁本体９００に溶接等により固着し、内部は気密状態に保させる。
【００２２】
ステータ５００は、磁性材より構成されるヨーク５１０と、このヨーク５１０にボビン５２０を介して巻回される上下のステータコイル５３０，５３０とから構成され、キャン４００に外嵌する嵌合孔が形成されている。
【００２３】
ステータ５００には、リード端子５４０が配設され、リード端子５４０に接続されるコネクタ５５０を覆うカバー５６０が形成されている。ステータ５００から、ステータコイル５３０，５３０に接続されたリード端子５４０が突出しており、このリード端子５４０に複数のリード線５７０が接続されたコネクタ５５０が連結されている。そして、コネクタ５５０を覆うカバー５６０がステータ５００に溶着され、カバー５６０内はエポキシ樹脂等の充填材５８０で充填されている。ステータ５００は中心に下面開口の嵌合孔を有し、この嵌合孔にキャン４００が嵌合する。
【００２４】
弁本体９００は、例えばステンレス等の金属から構成される。弁本体９００は、上下２枚の板体から構成されており、下方の弁本体基部９００ａの周縁にキャン４００のスカート状の部分４００ｂの固着部を備えるとともに、流体出入管２ａ，２ｂを連結する２つの継手部９５０が形成されている。
【００２５】
また、上方の部材９００ｂには、軸線を中心に一定の角度を有する位置に２つの第１連通孔９１０及び第２連通孔９２０が穿設されていると共に上面は弁座９４０を構成している。この弁座９４０上を弁体２００は弁体駆動体２１０の回転に伴い回転し、弁シート部２２８により摺動する。なお、上方の部材９００ｂ及び弁本体基部９００ａの弁室１１０部分の中心部には、回転軸８００の下端を支持する凹部９００ｃが形成される。
【００２６】
かくのごとく構成された弁体２２０、弁体駆動体２１０が回転軸８００により回転されることにより、第１連通孔９１０又は第２連通孔９２０のいずれか、若しくは両方の連通孔９１０，９２０を「開」とする作用を有する（図１及び図２は、第１連通孔９１０が「閉」で、流体が流体入出管２ｂから流体入出管２ａに流れる場合を示している。）。即ち、弁体２２０は、第１連通孔９１０又は第２連通孔９２０のいずれかを開閉することにより切換弁として作用することになる。
【００２７】
本実施形態では、前記構成により、冷媒の流れがどちらの方向であっても、弁体２００は冷媒圧により第１連通孔９１０又は第２連通孔９２０のいずれかに押圧される構造、若しくは両方の連通孔９１０，９２０を「開」とする構造となっていることから、第１→第２の流量＝第２→第１の流量を実現することに加えて、弁本体と弁体との隙間が小さくなり、冷媒の漏れを僅少にすることができるという効果を奏するばかりでなく、弁体２００にはオリフィス２２４を穿設したオリフィス形成部２２５を形成すると共に、少なくともオリフィス形成部２２５の流体流入側に、冷媒の気泡を細分化する多孔質部材２２６を配置することで、冷媒中の大気泡を消滅させて、電動切換え弁からの冷媒の流動に伴う騒音が低減することができる。また、多孔質部材として、オリフィス形成部２２５の両側に多孔質部材２２６，２２３を配置したことで、騒音の低減効果を一層向上させることができる。
【００２８】
具体的には、多孔質部材２２６は、冷媒中に含まれる大気泡を細分化し、冷媒がオリフィス２２４を通過するとき、流体中の大気泡は、流入口から弁室に流れ込んで多孔質部材１２６の貫通孔ないし網状部を通過する際に、分解されて細分化され、その細分化された状態で、大気泡に成長することなく速やかに、弁体２００に形成されるオリフィス２２４に流入するので、オリフィス２２４を通過する際、その流入側と流出側に急激な圧力変動は発生せず、流動音の低減効果が格段に向上し、除湿運転時の騒音を効果的に防止できる。
【００２９】
また、弁体２００の一部として板状体からなる簡単な構成の第１多孔質部材２２６を設けるだけで済むので、従来の気液分離器等を設ける場合に比して、スペース的にも、コスト的にも有利である。更に、第２多孔質部材２２３を付加することで、オリフィス２２４に流入する気液二相流の均質化とオリフィス２２４出口墳流の整流化が可能となる。
【００３０】
更に、弁体２００の駆動部として、プラスチックマグネットからなるロータ３００と回転軸８００と駆動部８１０とを一体化して形成したことで構成の一層の簡略化を図ることができる。また、弁体２００を、多孔質部材２２３，２２６とオリフィス形成部２２５とを一体化し更にシート部２２８を形成した弁部材２２０と、弁体駆動体２１０とから構成し、弁部材２２０と弁体駆動体２１０とを一体化したことで、製品としての構造を単純化できるから、製品の小型化と製造原価の一層の低廉化を図ることができる。
【００３１】
また、弁体駆動体２１０には、弁体２００の駆動部８１０と連接する係合部材２１１を設けたことで、弁体２００の受動構造がきわめて簡単になる。また、更に、弁本体９００を上下の２枚に分離し、上方の部材９００ｂには弁体２００のストッパ９３０と弁座９４０とを具備させ、下方の弁本体基部９００ａには流体出入管２ａ，２ｂの継手部９５０を形成して一体化したことで、弁本体９００の加工を容易にすることができる。また、両部材９００ａ，９００ｂの汎用性が向上する。
【００３２】
さらに本発明においては、図１、図２に示す基本構成において、流動音の低減効果を一層向上させるため、流体入出管２ｂから流入する冷媒を多孔質部材２２６，２２３へ確実により多く導入させる場合にも適用できる。
【００３３】
即ち、図３、図４及び図５はそれぞれ本発明の実施形態１，２，３を示す縦断面図であり、図３、図４及び図５の示す実施形態は、図１に示す電動切換え弁の基本構成とは流体入出管及び弁体の構成が異なる。なお、図３、図４及び図５において、図１と同一の構成部分には、図１と同一符号を付して説明を省略する。
【００３４】
図３に示す実施形態１において、流体入出管２ｂ１（入口パイプ）は、図１の流体入出管２ｂの流出側となる上端を弁室１１０内へ突出させ、流体入出管２ｂ１の上端２ｂ１’がオリフィス形成部２２５’に設けられたオリフィス２２４’よりも上部に位置するよう構成されている。
【００３５】
さらに、図３に示す実施形態１において、弁体２００’はオリフィス２２４’が穿設された断面略Ｈ字形状の、例えばステンレスを用いた金属製のオリフィス形成部２２５’と、オリフィス２２４’の上流側及び下流側に配置された多孔質部材２２６’及び２２３’とオリフィス形成部２２５’をインサート成形して一体化した弁体駆動体２１０’とからなり、弁体２００’と弁体駆動体２１０’とは一体に構成される。
【００３６】
前記オリフィス形成部２２５’は、円筒部を形成する壁部Ｗ１と壁部Ｗ１の中間位置に連結される円板部Ｗ２とからなり、壁部Ｗ１と円板部Ｗ２とで形成される空間部２２５’ａ及び空間部２２５’ｂに、例えば圧入により円板部Ｗ２と所定の距離を保って多孔質部材２２６’及び多孔質部材２２３’が配置されている。弁体駆動体２１０’はその中央部において回転軸８００に遊嵌されている。また、弁体駆動体２１０’は駆動部８１０とはある程度上下動可能なように遊嵌されている。
【００３７】
図３に示す実施形態１においては、弁本体９００’は一枚の部材９００’ａで構成し、流体入出管２ｂ１は一枚の部材９００’ａを貫通し、弁室１１０に突出して弁室１１０内に配置されており、流体入出管２ａは第１連通孔９１０に接続される。
【００３８】
そして、弁本体９００’を構成する部材９００’ａの上面９００’ｂが弁座となり、弁体駆動体２１０’に形成されている弁シート部２２８’が弁座上を摺動し、多孔質部材２２６’及び多孔質部材２２３’とオリフィス２２４’を通過する流体を第１連通孔９１０あるいは第２連通孔９２０に導入する（図２参照）。なお、図３においては、図１のキャン４００と略スカート状の部分４００ｂとは一体に形成されており、溶接部は存在しない。
【００３９】
かかる構成により流体入出管２ｂ１から流入する流体、例えば冷凍サイクル用の冷媒は弁室１１０を経てオリフィス２２４’に確実に流入し、その際多孔質部材２２６’及び２２３’により冷媒の流動音の低減効果を向上させることができる。
【００４０】
また、図４に示す実施形態２では、図３の実施形態１に示す流体入出管２ｂ１をその流出側となる端部２ｂ１’がオリフィス２２４’の上に位置するように流体入出管（入口パイプ）２ｂ１を曲げて弁室１１０内に配置したものである。この実施形態２において流体入出管２ｂ１は２分割され、曲管２ｂ２の部分と直管２ｂ３の部分とに分割され、弁本体９００’の本体部材９００’ａに両管を連通する連通孔９００ｃを形成している。なお、図４において、図１及び図３に示す実施例と同一部分には同一の符号を付して説明は省略している。
【００４１】
かかる図４に示す実施形態２の構成においても、直管２ｂ３から流入する冷媒は、連通孔９００’ｃを介して曲管２ｂ２よりオリフィス２２４’に確実に流入し、多孔質部材２２６’及び多孔質部材２２３’により、冷媒の流動音低減効果を一層向上させることができる。
【００４２】
なお、図３に示す実施形態１において、流体入出管２ｂ１を図５に示す実施形態３に示す如く、２分割して直管２ｂ３と直管２ｂ１”としてもよいのは勿論である。また、図４に示す実施形態２及び図５に示す実施形態３の如く、流体入出管２ｂ１を分割することによって組立性を向上させることができる。
【００４３】
実施形態１〜３は、前記した基本構成の電動切換え弁の効果と同様に、冷媒の流れがどちらの方向であっても、弁体２００’は冷媒圧により、流体出入管２ａに押圧される構造となっていることから、
第１→第２の流量＝第２→第１の流量を実現することに加えて、弁本体と弁体との隙間が小さくなり、冷媒の漏れを僅少にすることができる。
【００４４】
具体例には、冷房サイクル時の除湿時（冷媒は、第１流路２ａから第２流路２ｂに流れる。）と、暖房サイクル時の除湿時（冷媒は、第２流路２ｂから第１流路２ａに流れる。）とを、略同一の冷媒流状態とすることができる。
【００４５】
更に、本発明の実施形態では、第１流路２ａと第２流路２ｂとを近接して設けることができ、外形がコンパクトになるとともに、弁室１１０内における冷媒の移動が少なく、抵抗も少ないから、弁室１１０内における冷媒の移動エネルギの損失も少なくて済むという効果もある。
【００４６】
なお、前記各実施形態においては、小容量の流量を流すために、弁体流路として、オリフィスを形成したが、実施形態１〜３のように、弁体にオリフィスを形成しなければ流量は限りなくゼロに近い値となる。
【００４７】
【発明の効果】
以上の説明から理解できるように、このように構成された本発明の電動切換え弁は、冷媒等の流体の流れが正・逆いずれの方向であっても漏れ量が略同一となるため、流路を切り換える空調機等において正確な流量制御の実現が可能となる。また、上記機能に加えて流体の流れが正・逆いずれの方向であっても、流体圧が弁体を弁本体に押圧するようにしているから、弁室から流路への流体の漏れを僅少とする。更に、多孔質部材を弁体に具備せしめることにより、冷媒通過時の騒音を低減することができる。
【図面の簡単な説明】
【図１】本発明に係る電動切換え弁の基本構成の最小流量時の状態を示す縦断面図。
【図２】図１のＡ−Ａ断面矢視図。
【図３】本発明に係る電動切換え弁の実施形態１を示す縦断面図。
【図４】図３に示す実施形態１の変形例である実施形態２を示す縦断面図。
【図５】図３に示す実施形態１の変形例である実施形態３を示す縦断面図。
【図６】従来技術に係る電動弁の縦断面図。
【符号の説明】
１００…電動切換え弁、１１０…弁室、２００，２００’…弁体、２１０，２１０’…弁体駆動体、２１１…係合部材、２１２…連結部材、２２０…弁部材、２２１…孔、２２３，２２３’…［第２］多孔質部材、２２４，２２４’…オリフィス、２２５…オリフィス形成部、２２５’…オリフィス形成部、２２５’ａ…空間部、２２５’ｂ…空間部、２２６，２２６’…［第１］多孔質部材、２２８，２２８’…弁シート部、３００…ロータ、４００…キャン、４００ｂ…スカート状の部分、５００…ステータ、５００ａ…回り止め部材、５１０…ヨーク、５２０…ボビン、５３０…ステータコイル、５４０…リード端子、５５０…コネクタ、５６０…カバー、５７０…リード線、５８０…充填材、６００…弁体ホルダ、８００…回転軸、８１０…駆動部、８２０…ばね、９００，９００’…弁本体、９００ａ…弁本体基部、９００’ａ…本体部材、９００ｂ…上方の部材、９００’ｂ…部材上面、９００’ｃ…連通孔、９１０…第１連通孔、９２０…第２連通孔、９３０…ストッパ、９４０…弁座、９５０…継手部、Ｗ１…壁部、Ｗ２…円板部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric switching valve used is incorporated in an air conditioner or the like, in particular, fluid flowing through the electric switching valve, the flow direction irrespective of the forward and reverse electric switching valve which can be the same flow rate About.
[0002]
[Prior art]
Conventionally, an electric valve used by being incorporated in this type of air conditioner, refrigerator, etc. is a device that adjusts the flow rate of a fluid such as a refrigerant, and usually includes a valve body having a valve chamber and a valve seat, A cylindrical can with a bottom fixed to the upper part of the valve body through a hook-shaped portion, and a rotor is built inside the can, and an insertion hole is formed in the center portion outside the can. The stator which has is externally fitted.
FIG. 6 is a longitudinal sectional view of the conventional motor-operated valve 1 as described above. The valve body 2 includes a valve chamber 2c, a guide bush fixing portion 2d, and a can fixing portion 2e. Are provided with fluid inlet / outlet pipes 2a and 2b through which a fluid such as a refrigerant enters and exits, and a valve seat 2f to which a needle valve, which is a valve body 3a formed at the tip of the valve shaft 3, is contacted and separated. ing.
[0003]
The guide bush fixing portion 2d is located above the valve chamber, and fixes the valve body 2 and the guide bush 4. A female screw portion 4a is formed on the inner periphery of the guide bush 4, and a male screw portion 5a formed on the outer periphery of the valve element holder 5 is screwed into the female screw portion 4a. Is configured.
And in this valve body holder 5, the valve shaft 3 which forms the valve body 3a in the lower end part is slidably fitted, and this valve shaft 3 is shrunk in the valve body holder 5 inside. It is always urged downward by the compression coil spring 3b.
[0004]
The can fixing portion 2e is located at the upper end of the valve body 2 and is composed of a ring-shaped metal plate whose inner peripheral surface is fixed by caulking and whose lower end surface is joined by welding. The can 6 is fixed to the valve body 2 by welding to the valve body. The valve shaft 3 and the rotor 7 are coupled to each other by fitting the valve body holder 5 and the male screw portion 5a to the valve shaft 3 and fitting the valve shaft holder 5 to the rotor 7 with a permanent magnet.
A push nut 3 c is press-fitted and fixed to the upper end of the valve shaft 3, and its flange portion is coupled to the rotor 7 while allowing the valve shaft 3 to move slightly up and down. The lower stopper 4b fixed to the valve body holder 5 and the upper stopper 5b formed on the sleeve constitute a stopper mechanism.
[0005]
A rotor 7 is built in the can 6, and a stator 8 is fitted on the outside of the can 6. A stator coil 8 a and a yoke 8 b are stored in the stator 8 in the vertical direction, and the stator coil 8 a is energized through a lead wire 8 c and a connector 8 d provided on the outer periphery of the stator 8. The yoke 8b is excited by energization of the stator coil 8a to rotate the rotor 7, and the valve body holder 5 and the valve shaft 3 are slid by a screw feed mechanism to open and close to adjust the refrigerant flow rate. . A connector cover 8e is welded to the stator 8.
[0006]
[Problems to be solved by the invention]
By the way, in said prior art, the difference in the refrigerant | coolant pressure with respect to the valve body 3a comes out according to the direction of the normal / reverse flow of a refrigerant | coolant, As a result, the difference in the flow volume comes out according to the direction of the refrigerant | coolant flow. There is a bug.
That is, in FIG. 6 , when the refrigerant flows from the fluid inlet / outlet pipe 2a to the fluid inlet / outlet pipe 2b, the refrigerant pressure acts downward with respect to the valve body 3a. Therefore, the gap with the valve body 2 is small. On the other hand, when the fluid flows from the fluid inlet / outlet pipe 2b to the fluid inlet / outlet pipe 2a, the refrigerant pressure acts upward with respect to the valve body 3a. Therefore, there is a problem that the gap with the valve body 2 becomes large and the flow rate is increased accordingly.
[0007]
The present invention has been made in view of such problems, and the problem is that the fluid such as refrigerant flowing through the electric switching valve has the same flow rate regardless of the forward and reverse flow directions. It is an object of the present invention to provide an electric switching valve capable of achieving the above. Further, in such an electric switching valve, an electric switch recombination valve it is possible to reduce noise at the electric switching valve passage of the fluid (refrigerant).
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an electric switching valve according to the present invention comprises the following means.
According to a first aspect of the present invention, there is provided an electric switching valve comprising: a valve body that adjusts a flow rate of fluid through a valve body in a valve chamber; a can that is fixed to the valve body and includes a rotor that operates the valve body; a fitted to an electric switching valve having a stator for rotating said rotor, said valve body, and a rotatable, regardless any flow direction of the fluid is forward or reverse, configured so that the flow rate is substantially the same The valve body is made of a disk-shaped member, and a first communication hole and a second communication hole are formed around the center of the disk-shaped member, and the valve body rotates toward the can side of the disk-shaped member. The valve body is disposed so as to be movable to a position where the first communication hole and the second communication hole are selectively closed and a position where both the first communication hole and the second communication hole are not closed. , Each communication on the opposite side of the disc-shaped member from the side where the valve body is disposed In addition, the first flow path and the second flow path are mounted, and an orifice forming portion having an orifice formed in the valve body is formed, and a porous member is disposed at least on the fluid inflow side of the orifice forming portion. In addition, a fluid inlet / outlet pipe is connected to the valve body to form the first flow path and the second flow path, and an outlet end portion of a fluid inlet / outlet pipe constituting a flow path on the fluid inflow side is the orifice. It is characterized by being configured to be positioned higher .
[0009]
Electric switching valve 請 Motomeko 2 wherein is the electric switching valve as claimed in claim 1, wherein an end portion of the valve chamber is bent previous SL fluid input and tube, characterized in that located above the prior SL orifice .
Electric switching valve according to claim 3, wherein, in claim 1 or 2 electric switching valve as claimed, before Symbol fluid input and tube, characterized in that it is connected before Kiben body is divided.
[0010]
Electric switching valve according to claim 4, wherein, the arrangement in the electric switching valve as claimed in any one of claims 1 to 3, as the porous member, the first porous member and the second porous member on either side of the orifice forming portion It is characterized by that.
Forming an electric switching valve according to claim 5, wherein is the electric switching valve as claimed in any one of claims 1 to 4, as a drive unit of the valve body, by integrating the the drive unit rotor and the rotating shaft made of a plastic magnet It is characterized by that.
[0011]
Electric switching valve according to claim 6, wherein is the electric switching valve as claimed in any one of claims 1 to 5, the valve body formed a seat with integrated said porous member and said orifice forming portion It is characterized by that.
Electric switching valve according to claim 7, wherein is the electric switching valve according to claim 6, wherein the valve body, characterized in that it is rotated by the valve body drive member which is integrated with the valve body.
[0012]
Electric switching valve according to claim 8 wherein is the electric switching valve as claimed in claim 1, to separate the valve body into two, the upper member is provided with a stopper and the valve seat of the valve body, the lower valve the body base portion, characterized in that integrated to form a joint portion of the fluid and out tube.
[0013]
The electric switching valve configured as described above has the same amount of leakage regardless of whether the flow of the fluid such as the refrigerant is in the forward or reverse direction. Realization of accurate flow rate control. In addition to the above functions, the fluid pressure presses the valve body against the valve body regardless of whether the fluid flow is forward or reverse, so that the fluid leaks from the valve chamber to the flow path. Become scarce. Moreover, the noise accompanying the flow of the fluid is reduced from the electric switching valve.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the electric switching valve 100 according to the present invention will be described in detail. Figure 1 is a longitudinal sectional view showing a minimum flow rate when the state of the basic structure of an electric switching valve 100 according to the present invention, FIG 2 is an A-A sectional view on arrows of FIG.
[0015]
The electric switching valve 100 includes a valve body 900, a can 400 fixed to the valve body 900 by welding, a rotor 300 installed in the can 400, a valve body 200 that rotates in the valve chamber 110 by the rotor 300, And a stator 500 that is externally fitted to the can 400 and rotationally drives the cup-shaped rotor 300. The rotor 300 and the stator 500 constitute a stepping motor.
[0016]
The rotor 300 is cylindrical and has a substantially cup shape made of a plastic magnet as a whole so as to be housed in a can 400 described later. A rotating shaft 800 is inserted and fixed to the bottom 600 of the rotor 300. . A driving unit 810 for driving the valve body 200 is integrally formed on the bottom 600.
[0017]
As shown in FIG. 1 , the valve body 200 includes a cylindrical valve member 220 made of, for example, brass, and a plate-like member serving as an orifice forming portion 225 that is provided integrally with the valve member 220 to form an orifice 224. , A porous member 226 provided on the upstream side where the refrigerant flows into the orifice 224, and a valve seat portion 228 formed integrally with the peripheral edge of the valve member 220.
[0018]
FIG. 1 shows a case where a porous member 223 is provided on the downstream side from which the refrigerant flows out of the orifice 224, and these porous members are arranged at a predetermined interval from the orifice forming portion 225. The valve member 220 is provided by being fixed. These porous members 226 and 223 are formed by forming a foam metal having nickel, copper or the like as a main component into a disk shape, or forming a foamed resin into a disk shape. Furthermore, a mesh-like wire mesh member formed by knitting metal threads such as stainless steel, shinchu, iron, and aluminum, for example, a product name “Accummesh” manufactured by Toa Steel Corporation may be used.
[0019]
The valve body 200 is rotated by a valve body driving body 210 made of, for example, a synthetic resin, and the valve seat portion 228 slides on a valve seat of a valve main body 900 described later. The valve body driver 210 is formed in a planar shape, and the connection member 212 provided integrally with the valve body driver 210 is engaged with a groove 220a on the circumferential surface of the valve member 220, The valve body driver 210 is configured integrally with the valve body 200. Thus, the valve body 200 is formed in a circular shape in plan view as shown in FIG. 2 , and the valve body driving body 210 is formed in a substantially rectangular shape in plan view, and both are integrated by a connecting member 212.
[0020]
The valve body driver 210 is loosely fitted to the rotary shaft 800 at the center thereof. The valve body driving body 210 is provided with two front and rear engaging members 211, 211, and both engaging members 211 have a driving portion 810 formed integrally as a hanging plate on the bottom of the rotor 300 on the rotating shaft 800 side. It is arranged so as to sandwich it. Further, the valve body driver 210 is loosely fitted to the drive unit 810 so as to be movable up and down to some extent. The driving unit 810 is a side view square shape as shown in FIG. A spring 820 is contracted between the lower surface of the drive unit 810 and the upper surface of the valve body driver 210.
[0021]
The can 400 includes a bottomed cylindrical portion 400a formed of a nonmagnetic metal such as stainless steel, and a substantially skirt-shaped portion 400b in which a first opening 400c is fixed coaxially to the opening of this portion by welding. The opening 400d is fixed to the valve body 900 by welding or the like, and the inside is kept airtight.
[0022]
The stator 500 includes a yoke 510 made of a magnetic material, and upper and lower stator coils 530 and 530 wound around the yoke 510 via a bobbin 520, and a fitting hole that fits outside the can 400 is formed. Has been.
[0023]
The stator 500 is provided with a lead terminal 540 and a cover 560 that covers the connector 550 connected to the lead terminal 540. A lead terminal 540 connected to the stator coils 530 and 530 protrudes from the stator 500, and a connector 550 to which a plurality of lead wires 570 are connected is connected to the lead terminal 540. A cover 560 covering the connector 550 is welded to the stator 500, and the inside of the cover 560 is filled with a filler 580 such as an epoxy resin. The stator 500 has a fitting hole having a lower surface opening at the center, and the can 400 is fitted into the fitting hole.
[0024]
The valve body 900 is made of a metal such as stainless steel, for example. The valve body 900 is composed of two upper and lower plates, and includes a fixed portion of the skirt-like portion 400b of the can 400 on the periphery of the lower valve body base 900a and connects the fluid inlet / outlet pipes 2a and 2b. Two joint portions 950 are formed.
[0025]
The upper member 900b has two first communication holes 910 and a second communication hole 920 formed at a position having a certain angle around the axis, and the upper surface constitutes a valve seat 940. . The valve body 200 rotates on the valve seat 940 as the valve body driving body 210 rotates, and slides on the valve seat portion 228. A concave portion 900c that supports the lower end of the rotary shaft 800 is formed at the center of the valve chamber 110 portion of the upper member 900b and the valve main body base 900a.
[0026]
When the valve body 220 and the valve body driving body 210 configured as described above are rotated by the rotation shaft 800, either the first communication hole 910 or the second communication hole 920 or both of the communication holes 910 and 920 are provided. 1 and FIG. 2 show the case where the first communication hole 910 is “closed” and the fluid flows from the fluid inlet / outlet pipe 2b to the fluid inlet / outlet pipe 2a. That is, the valve body 220 acts as a switching valve by opening or closing either the first communication hole 910 or the second communication hole 920.
[0027]
Structure In the present embodiment, the pre-Symbol configuration, even flow either direction of the refrigerant, the valve body 200 is pressed in either the first communication hole 910 or the second communication hole 920 by the refrigerant pressure, Alternatively, since both the communication holes 910 and 920 are configured to be “open”, in addition to realizing the first → second flow rate = second → first flow rate, the valve body and the valve body The valve body 200 is formed with an orifice forming part 225 having an orifice 224 and at least an orifice forming part 225. By disposing a porous member 226 that subdivides the refrigerant bubbles on the fluid inflow side, large bubbles in the refrigerant can be eliminated, and noise accompanying the flow of the refrigerant from the electric switching valve can be reduced. . Further, since the porous members 226 and 223 are disposed on both sides of the orifice forming portion 225 as the porous member, the noise reduction effect can be further improved.
[0028]
Specifically, the porous member 226 subdivides large bubbles contained in the refrigerant, and when the refrigerant passes through the orifice 224, the large bubbles in the fluid flow into the valve chamber from the inflow port. When passing through the through-hole or net-like portion of the tube, it is decomposed and subdivided, and immediately flows into the orifice 224 formed in the valve body 200 without growing into large bubbles in the subdivided state. When passing through the orifice 224, sudden pressure fluctuations do not occur on the inflow side and the outflow side, the effect of reducing the flow noise is greatly improved, and noise during the dehumidifying operation can be effectively prevented.
[0029]
Further, since it is only necessary to provide the first porous member 226 having a simple configuration made of a plate-like body as a part of the valve body 200, the space can be reduced as compared with the case where a conventional gas-liquid separator or the like is provided. This is also advantageous in terms of cost. Furthermore, by adding the second porous member 223, it is possible to homogenize the gas-liquid two-phase flow flowing into the orifice 224 and to rectify the swirling flow at the outlet of the orifice 224.
[0030]
Further, the rotor 300 made of a plastic magnet, the rotating shaft 800, and the drive unit 810 are integrally formed as the drive unit of the valve body 200, whereby the configuration can be further simplified. Further, the valve body 200 includes a valve member 220 in which the porous members 223 and 226 and the orifice forming portion 225 are integrated to form a seat portion 228, and a valve body driving body 210. The valve member 220 and the valve body Since the structure of the product can be simplified by integrating the drive body 210, the product can be downsized and the manufacturing cost can be further reduced.
[0031]
Further, since the valve body driving body 210 is provided with the engaging member 211 connected to the driving portion 810 of the valve body 200, the passive structure of the valve body 200 becomes very simple. Further, the valve body 900 is divided into two upper and lower parts, the upper member 900b is provided with a stopper 930 and a valve seat 940 of the valve body 200, and the lower valve body base 900a is provided with a fluid inlet / outlet pipe 2a, By forming and integrating the joint portion 950 of 2b, the processing of the valve body 900 can be facilitated. Moreover, the versatility of both members 900a and 900b is improved.
[0032]
Furthermore, in the present invention, in the basic configuration shown in FIG . 1 and FIG. 2, in order to further improve the effect of reducing the flow noise, the refrigerant flowing from the fluid inlet / outlet pipe 2b is more surely introduced into the porous members 226 and 223. It can also be applied to.
[0033]
That is, FIG. 3 is a longitudinal sectional view showing a third embodiments of FIGS. 4 and 5 present invention, respectively, the embodiment shown of Fig. 3, 4 and 5, the electric switching shown in FIG. 1 The basic structure of the valve is different from the structure of the fluid inlet / outlet pipe and the valve body. Incidentally, FIG. 3, omitted in FIG. 4 and FIG. 5, the same components as in FIG. 1, a will be denoted by the same reference numerals as in FIG. 1.
[0034]
In the first embodiment shown in FIG. 3 , the fluid inlet / outlet pipe 2b1 (inlet pipe) has an upper end on the outflow side of the fluid inlet / outlet pipe 2b in FIG. 1 protruding into the valve chamber 110, and an upper end 2b1 ′ of the fluid inlet / outlet pipe 2b1 is It is configured to be positioned above the orifice 224 ′ provided in the orifice forming part 225 ′.
[0035]
Further, in the first embodiment shown in FIG. 3 , the valve body 200 ′ has a substantially H-shaped cross section in which an orifice 224 ′ is formed, for example, a metal orifice forming portion 225 ′ using stainless steel, and an orifice 224 ′. The valve body 200 ′ and the valve body drive body are composed of a porous body 226 ′ and 223 ′ disposed on the upstream side and the downstream side and a valve body drive body 210 ′ in which the orifice forming portion 225 ′ is integrated by insert molding. 210 ′ is integrally formed.
[0036]
Before SL orifice forming portion 225 'consists of a disc portion W2 Metropolitan coupled to an intermediate position of the wall W1 and the wall portion W1 to form the cylindrical portion, the space formed by the wall W1 and the disc portion W2 A porous member 226 ′ and a porous member 223 ′ are disposed in the portion 225′a and the space portion 225′b, for example, by pressing to maintain a predetermined distance from the disc portion W2. The valve body driver 210 ′ is loosely fitted to the rotary shaft 800 at the center thereof. Further, the valve body driving body 210 ′ is loosely fitted to the driving unit 810 so as to be movable up and down to some extent.
[0037]
In the first embodiment shown in FIG. 3 , the valve body 900 ′ is composed of a single member 900 ′ a, and the fluid inlet / outlet pipe 2 b 1 penetrates the single member 900 ′ a and protrudes into the valve chamber 110 to protrude from the valve chamber. The fluid inlet / outlet pipe 2 a is connected to the first communication hole 910.
[0038]
Then, the upper surface 900′b of the member 900′a constituting the valve body 900 ′ serves as a valve seat, and the valve seat portion 228 ′ formed on the valve body driver 210 ′ slides on the valve seat, and is porous. The fluid passing through the member 226 ′ and the porous member 223 ′ and the orifice 224 ′ is introduced into the first communication hole 910 or the second communication hole 920 (see FIG. 2 ). In FIG. 3 , the can 400 of FIG. 1 and the substantially skirt-shaped portion 400b are integrally formed, and there is no welded portion.
[0039]
With this configuration, the fluid flowing in from the fluid inlet / outlet pipe 2b1, for example, the refrigerant for the refrigeration cycle, surely flows into the orifice 224 'through the valve chamber 110, and at this time, the flow noise of the refrigerant is reduced by the porous members 226' and 223 '. The effect can be improved.
[0040]
Further, in the embodiment 2 shown in FIG. 4, the fluid input and tube so that the end portion 2b1 made fluid input and pipe 2b1 shown in the embodiment 1 of Fig. 3 and its outflow side 'orifices 224' located on the (inlet Pipe) 2b1 is bent and arranged in the valve chamber 110. In the second embodiment , the fluid inlet / outlet pipe 2b1 is divided into two parts, a curved pipe 2b2 and a straight pipe 2b3, and a communication hole 900c that connects both pipes to the main body member 900′a of the valve main body 900 ′. Forming. In FIG. 4 , the same parts as those in the embodiment shown in FIGS. 1 and 3 are denoted by the same reference numerals, and the description thereof is omitted.
[0041]
Also in the configuration of the second embodiment shown in FIG. 4 , the refrigerant flowing from the straight pipe 2b3 surely flows into the orifice 224 ′ from the curved pipe 2b2 through the communication hole 900′c, and the porous member 226 ′ and the porous The quality member 223 ′ can further improve the refrigerant flow noise reduction effect.
[0042]
It should be noted that in the embodiment 1 shown in FIG. 3, as shown a fluid input and pipe 2b1 to the third embodiment shown in FIG. 5, the may be divided into two to straight pipe 2b3 and straight pipe 2b1 "as a matter of course. Further, As in the second embodiment shown in FIG. 4 and the third embodiment shown in FIG. 5 , the assembling property can be improved by dividing the fluid inlet / outlet pipe 2b1.
[0043]
In the first to third embodiments , similarly to the effect of the electric switching valve having the basic configuration described above , the valve body 200 ′ is pressed against the fluid inlet / outlet pipe 2a by the refrigerant pressure regardless of the direction of the refrigerant flow. Because of the structure,
In addition to realizing the first → second flow rate = second → first flow rate, the gap between the valve body and the valve body is reduced, and refrigerant leakage can be minimized.
[0044]
In concrete body example, dehumidification when the cooling cycle (refrigerant flows. The second passage 2b from the first flow path 2a) and, dehumidification time (refrigerant during the heating cycle, the second flow path 2b 1 Can flow into the flow path 2a).
[0045]
Furthermore, in the embodiment of the present invention , the first flow path 2a and the second flow path 2b can be provided close to each other, the outer shape becomes compact, the movement of the refrigerant in the valve chamber 110 is small, and the resistance is also low. Since there is little, there is also an effect that the loss of the moving energy of the refrigerant in the valve chamber 110 can be reduced.
[0046]
In the prior SL embodiments, in order to flow a flow of small capacity, as the valve body passage has formed the orifice, as in the first to third embodiments, unless an orifice in the valve body flow Is infinitely close to zero.
[0047]
【The invention's effect】
As can be understood from the above description, the electric switching valve of the present invention configured as described above has substantially the same leakage amount regardless of whether the flow of fluid such as refrigerant is in the forward or reverse direction. Accurate flow control can be realized in an air conditioner or the like that switches the path. In addition to the above function, the fluid pressure presses the valve body against the valve body regardless of whether the fluid flow is in the forward or reverse direction. Slightly. Furthermore, by providing the valve member with the porous member, it is possible to reduce noise when the refrigerant passes.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state of a basic configuration of an electric switching valve according to the present invention at a minimum flow rate .
FIG. 2 is a cross-sectional view taken along the line AA of FIG .
FIG. 3 is a longitudinal sectional view showing Embodiment 1 of the electric switching valve according to the present invention .
FIG. 4 is a longitudinal sectional view showing a second embodiment which is a modification of the first embodiment shown in FIG .
FIG. 5 is a longitudinal sectional view showing a third embodiment which is a modification of the first embodiment shown in FIG .
FIG. 6 is a longitudinal sectional view of a motor-operated valve according to the prior art .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Electric switching valve, 110 ... Valve chamber, 200, 200 '... Valve body, 210, 210' ... Valve body drive body, 211 ... Engagement member, 212 ... Connection member, 220 ... Valve member, 221 ... Hole, 223 , 223 '... [second] porous member, 224, 224' ... orifice, 225 ... orifice forming part, 225 '... orifice forming part, 225'a ... space part, 225'b ... space part, 226, 226' ... [First] porous member, 228, 228 '... valve seat part, 300 ... rotor, 400 ... can, 400b ... skirt-like part, 500 ... stator, 500a ... non-rotating member, 510 ... yoke, 520 ... bobbin 530 ... Stator coil, 540 ... Lead terminal, 550 ... Connector, 560 ... Cover, 570 ... Lead wire, 580 ... Filler, 600 ... Valve body holder, 800 ... Rotating shaft, 810 ... Drive 820 ... Spring, 900, 900 '... Valve body, 900a ... Valve body base, 900'a ... Body member, 900b ... Upper member, 900'b ... Member upper surface, 900'c ... Communication hole, 910 ... First Communicating hole, 920 ... 2nd communicating hole, 930 ... Stopper, 940 ... Valve seat, 950 ... Joint part, W1 ... Wall part, W2 ... Disc part

Claims

A valve body that adjusts the flow rate of fluid by a valve body in the valve chamber; a can that is fixed to the valve body and that houses a rotor that operates the valve body; and a stator that is externally fitted to the can and rotationally drives the rotor. An electric switching valve with
The valve body is configured to be rotatable and configured to have substantially the same flow rate regardless of whether the fluid flow direction is forward or reverse .
The valve body is formed of a disk-shaped member, and a first communication hole and a second communication hole are formed around a central portion of the disk-shaped member, and the valve body rotates to the can side of the disk-shaped member to rotate the first body. The valve body is disposed so as to be movable between a position where the first communication hole and the second communication hole are selectively closed and a position where both the first communication hole and the second communication hole are not closed. The first flow path and the second flow path are attached to each communication hole on the side opposite to the side where the valve body is disposed of the disk-shaped member,
The valve body is formed with an orifice forming portion having an orifice, and at least a porous member is disposed on the fluid inflow side of the orifice forming portion,
A fluid inlet / outlet pipe is connected to the valve body to form the first flow path and the second flow path, and an outlet side end portion of the fluid inlet / outlet pipe constituting the flow path on the fluid inflow side of the valve body is formed from the orifice An electric switching valve characterized by being positioned above .

Electric switching valve according to claim 1 in which the end portion of the valve chamber is bent previous SL fluid input and tube, characterized in that located above the prior SL orifice.

Electric switching valve according to claim 1 or 2 before Symbol fluid input and tube, characterized in that it is connected before Kiben body is divided.

4. The electric switching valve according to claim 1, wherein a first porous member and a second porous member are disposed on both sides of the orifice forming portion as the porous member. 5.

Before a drive section Kiben body, electric switching valve as claimed in claim 1, characterized in that formed by integrating the the drive unit rotor and the rotating shaft made of a plastic magnet 4.

Before Kibentai The electric switching valve as claimed in any one of claims 1 to 5, characterized in that the formation of the seat as well as integrated with the said porous member orifice forming portion.

Before Kibentai The electric switching valve as claimed in claim 6, characterized in that it is rotated by integrated valve body drive member and valve body.

Separating the valve body into two, the upper member is provided with a stopper and the valve seat of the valve body, the valve body base beneath characterized in that integrated to form a joint portion of the fluid and out tube The electric switching valve according to claim 1 .