JP2004137638A

JP2004137638A - Weft-inserting nozzle of fluid jetting type loom

Info

Publication number: JP2004137638A
Application number: JP2002304932A
Authority: JP
Inventors: Koichi Hattori; 服部　恒一
Original assignee: Tsudakoma Corp; Tsudakoma Industrial Co Ltd
Current assignee: Tsudakoma Corp
Priority date: 2002-10-18
Filing date: 2002-10-18
Publication date: 2004-05-13
Anticipated expiration: 2022-10-18
Also published as: CN100582339C; CN101440549A; JP3934026B2; KR20040034418A; CN1497083A; KR100996356B1; TW200406515A; CN101440549B

Abstract

<P>PROBLEM TO BE SOLVED: To optimize a space dimension between a rectifying fin on upstream side and a rectifying fin on downstream fin and a relationship between the number of a water supply hole and the number of rectifying grooves while optimizing the number of the rectifying grooves of a plurality of rectifying members of a weft-inserting nozzle. <P>SOLUTION: The weft-inserting nozzle of the fluid jetting type loom comprises a needle 1, a nozzle body 2 in which a water supply hole 13 formed in a hollow shape and passing through a hollow part 3 is provided and the needle is inserted into the hollow part 3 and a circular chamber 4 made to communicate with the water supply hole is constituted between the top of the needle 1 and the nozzle body 2, and a plurality of rectifying fins 5 and 6 arranged in the circular chamber in turn in the advancing direction of weft. Each rectifying fin has a plurality of rectifying passages 17, 30 and 20 provided at equal spaces in the circumferential direction and each extending to the shaft direction. In the weft-inserting nozzle of the fluid jetting type loom, the number of each rectifying passage of a first rectifying member and a second rectifying member is kept to ≥6 and ≤40 and mutually has no common denominator. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、流体噴射式織機の緯入れノズルに関する。
【０００２】
【従来の技術】
従来の流体噴射式織機の緯入れノズルとしては、ノズル本体の中にニードルを挿入し、ニードルの先部とノズル本体の間に環状の流路を形成し、その流路に２つの整流部材を配置し、ノズル本体には適切な数の給水孔を流路の上流側に設け、下流側の整流部材とニードルとの間の噴射孔から流体を噴射するものがある。また、整流部材は、全体として円筒状で、放射状の整流フィンを円周方向に等間隔で設け、隣接する整流フィンの間に形成される整流溝に、流体を通過させるもので、上流側の整流部材は、整流フィンの数を１６枚とし、下流側の整流部材は、整流フィンの数を１８枚としてある（例えば、特許文献１参照。）。
【０００３】
【特許文献１】
特開２０００−１１９９３７号公報（第３頁左欄、第４頁右欄、第５図、第６図）
【０００４】
【発明が解決しようとする課題】
ところが、上述した従来のものは、上流側と下流側の整流溝の重なり具合（上流側の整流溝の中心と下流側の整流溝の中心との関係）については考慮してない。整流フィンの数が上流側と下流側の整流部材とで違うと、上流側と下流側の整流溝の重なり具合が、整流溝毎に異なってくる。そうすると、整流溝を通過する流体の流速が整流溝毎に異なって流体にニードルの周りに旋回流を生ずることになる結果、流量の多い部分と少ない部分とが発生して、噴射孔からのジェット流の断面形状が、真円から外れた形状になりやすい。特に、上流側の整流フィンの数と、下流側の整流フィンの数との間に、整数倍以外の公約数が存在する場合は、その傾向が顕著である。例えば、前述したように上流側の整流フィンの数が１６で、下流側の整流フィンの数が１８で、双方の数の公約数が２である場合に、上流側の整流溝の中心と下流側の整流溝の中心を一致すると、図１１に示すように、ジェット流の断面形状は、整流溝の中心の重なり具合が最も大きい位置で最も膨らむ、すなわち二方向に突出した扁平な形状となるものと予想される。ジェット流がこのように真円から外れた形状になると、拡散が大きくなったり、あるいは経糸開口に衝突して織物欠点（縦筋）が生ずるという問題がある。
【０００５】
また、上述した従来のものは、上流側と下流側の整流フィン同士の間の隙間寸法、給水孔の数と整流溝の数の関係や、給水孔と整流溝との連通具合（給水孔の中心と整流溝の中心との関係）についても何等述べていない。しかし、これらも上述した問題を生ずる要因となるものである。
【０００６】
そこで、本発明の解決課題は、複数の整流部材の整流溝の数の最適化を図りつつ、併せて上流側と下流側の整流フィン同士の間の隙間寸法、給水孔の数と整流溝の数の各関係についても最適化を図ることである。
【０００７】
【課題を解決するための手段】
請求項１に係る発明は、導糸孔を有するニードルと、中空状に形成され、中空部に貫通する給水孔を備える一方、中空部にニードルが挿入されてニードルとの間に、給水孔に通じる環状の流路を構成するノズル本体と、緯糸進行方向に順番に環状の流路に配置される複数の整流部材とからなり、各整流部材は、その円周方向に等間隔に設けられ軸方向にそれぞれ延在する複数の整流路を有する、流体噴射式織機の緯入れノズルにおいて、第一整流部材と第二整流部材の各整流路の数を、６以上４０以下で且つ互いに公約数を有しない数とすることを特徴とする。
【０００８】
本件の緯入れノズルとして、給水孔の数は、全体に１つ設けられるもの、複数設けられるもの、いずれも考えられる。整流部材は、ノズル本体とニードルの双方とは別体に形成されていても良いし、ノズル本体とニードルのいずれか一方と一体に形成されていても良い。従って、整流フィンを有するノズル本体の内周面とは、ノズル本体と整流部材が一体に形成されている場合には、ノズル本体の内周面そのものであるし、ノズル本体と整流部材が別体に形成され且つノズル本体に整流部材を圧入する場合には、整流部材の整流路のことである。整流フィンを有するニードルの外周面も、同様である。好ましくは、複数の整流部材を構成する第二整流部材は、請求項２、３に係る発明のように、円周方向に等間隔に設けられかつニードルの外周面又はノズル本体から他方の側および軸方向にそれぞれ延在する複数の整流フィンを有し、隣接する整流フィンにより画定される整流溝を整流路として構成される。これに対し、第一整流部材は、請求項２に係る発明のように、第二整流部材と同様に整流溝を整流路として構成される、あるいは請求項３に係る発明のように、円周方向に等間隔にかつ軸方向に延在して形成される整流孔を整流路として構成される。
【０００９】
また、整流フィンを有するニードルの外周面又はノズル本体の内周面は、緯糸進行方向に沿って径が小さくなるテーパー形状であっても良いし、緯糸進行方向に沿って径が同じ形状であっても良い。整流部材は複数設けるので、２個以上設ける。
【００１０】
第一整流部材の整流路の数と第二整流部材の整流路の数は、５以下では、整流路に当たる流体の流量が多くなって、流体の収束性が悪い。４１以上になると、整流フィンには流体によって曲がらない程度の厚みが必要なので、ノズル本体が大型化する。また、無理に小型化しようとすれば、整流フィンが薄くなって、流体によって振動が生じたり、強度や耐久性が悪くなる。従って、６以上４０以下であれば、流体の収束性や耐久性等も良いので、緯入れノズルの小型化が可能となる。
【００１１】
また、第一整流部材の整流路の数と、第二整流部材の整流路の数は、互いに公約数がないので、給水孔の中心と第一整流部材の整流路または整流フィンのいずれかの中心を合わせたとしても、中心同士が一致する数は最大１であり、公約数２が存在するものに比べて、その数が少ないことから、拡散の少ない断面形状となり、円形に近いジェット流が得られる。従って、給水孔の中心と第一整流部材の整流路の中心を合わせる作業が不要となる。
【００１２】
請求項４に係る発明は、給水孔の数を４以上２６以下とする一方、第一整流部材の整流路の数を、給水孔の数の１倍以上の整数倍の数とし、且つ給水孔の中心と第一整流部材の整流路あるいは整流フィンのうちいずれかの中心を一致することを特徴とする。
【００１３】
給水孔の数が第一整流部材の整流路の数よりも少ないとき、全ての整流路の中心を、給水孔の中心と一致させることは現実的には不可能であるが、ここでの「給水孔の中心と第一整流部材の整流路の中心を一致する」とは、給水孔の数と対応する個数の整流路の中心を、給水孔の中心と一致させることを意味する。また、中心の一致とは、ニードルの軸線方向を中心とする一つの放射線上に、双方の円周幅方向の中心が配置されていることをいう。
【００１４】
給水孔の数は３以下では給水孔当たりの流量が多くなり、乱流が生じやすい。２７以上になると、強度的な問題によりノズル本体が大型化する。従って、４以上２６以下の場合は、乱流を生ずることなく、ノズル本体を小型化できる。
【００１５】
第一整流部材の整流路の数を、給水孔の数の１倍以上の整数倍の数とし、且つ給水孔の中心と第一整流部材の整流路または整流フィンのいずれかの中心を一致すると、第一整流部材の全整流路から流出する流体は、全体としては旋回流が生じないものとなる。例えば、給水孔の数に対して整流路の数が２倍の場合で、上記効果の理由を詳しく説明する。給水孔の中心に対し第一整流部材のうち中心が一致する整流路には、流体が真っ直ぐに流れ込む。また、給水孔の中心に対し中心が一致しない整流路にも給水孔から流体が流れ込むが、整流路及び給水孔はいずれも等間隔で設けてあるので、中心が一致しない各整流路から最も近い給水孔は、それぞれ２つある。従って、中心が一致しない整流路には、２つの給水孔から均等に流体が流れ込むので、旋回流が生じないことになる。
【００１６】
請求項５に係る発明は、給水孔の数を４以上２６以下とする一方、第一整流部材の整流路の数を、給水孔の数の１．５倍以上の数とし、且つ給水孔の数と第一整流部材の整流路の数を、互いに公約数を有しない数とすることを特徴とする。
【００１７】
１．５倍とは経験的に得られた値である。１．５倍未満であれば、整流が効率的に行われず、また、給水孔から整流路に流入する際に乱流が発生して、ジェット水流の拡散を招く。
【００１８】
請求項６に係る発明は、導糸孔を有するニードルと、中空状に形成され、中空部に貫通する給水孔を備える一方、中空部にニードルが挿入されてニードルとの間に、給水孔に通じる環状の流路を構成するノズル本体と、緯糸進行方向に順番に環状の流路に配置される複数の整流部材とからなり、各整流部材は、その円周方向に等間隔に設けられ且つニードルの外周面又はノズル本体の内周面のいずれか一方から他方の側及び軸方向にそれぞれ延在する複数の整流フィンを有し、隣接する整流フィンにより画定される整流溝を整流路として有する、流体噴射式織機の緯入れノズルにおいて、第一整流部材と第二整流部材の各整流路の数を、６以上４０以下で且つ第二整流部材の整流路の数を、第一整流部材の整流路の数に対してＫ倍あるいは１／Ｋ倍の整数に定めると共に、Ｋは２以上の整数とし、第一整流部材の整流路あるいは整流フィンのうちいずれかの中心と、第二整流部材の整流路あるいは整流フィンのうちいずれかの中心とを一致することを特徴とする。
【００１９】
また、請求項７に係る発明は、複数の整流部材を構成する第一および第二整流部材について、第一整流部材は、円周方向に等間隔にかつ軸方向に延在すべく設けられ整流孔を整流路として有するとともに、第二整流部材は、円周方向に等間隔に設けられかつニードルの外周面又はノズル本体から他方の側および軸方向にそれぞれ延在する複数の整流フィンを有し、隣接する整流フィンにより画定される整流溝を整流路として有する緯入れノズルを前提とし、第一整流部材と第二整流部材の各整流路の数を、請求項６に係る発明と同様とするとともに、第一整流部材の整流孔の中心と、第二整流部材の整流溝または整流フィンのうちいずれかの中心とを一致することを特徴とする。
【００２０】
第一整流部材の整流路の数と第二整流部材の整流路の数との関係が２倍以上の整数倍の関係を満たしながら整流路等の中心同士を一致する場合は、整数倍以外の公約数２を有する従来品に比べて、整流路の中心同士が一致する数が大幅に増え、ジェット流の断面形状が円形に近くなる。
【００２１】
請求項８に係る発明は、請求項６，７に係る発明の下位概念であって、給水孔の数を４以上２６以下とする一方、第一整流部材の整流路の数を給水孔の数の１倍以上の整数倍の数とし、且つ給水孔の中心と第一整流部材の整流フィンあるいは整流路のうちいずれかの中心とを一致することを特徴とする。
【００２２】
請求項９に係る発明は、第一整流部材の整流フィンと第二整流部材の整流フィンとの間には、隙間が設けてあることを特徴とする。好ましくは、隙間は０．１ｍｍ以上数ｍｍ以下とする。
【００２３】
０．１ｍｍ未満では第一整流部材の整流フィンと、第二整流部材の整流路が重なり合う場合に、流体が第二整流部材の整流路に流れ難くなり、逆に１０ｍｍを越えれば、隙間で乱流が発生したりして、いずれのときも整流機能が低下する。
【００２４】
請求項１０に係る発明は、第二整流部材の整流路の数を第一整流部材の整流路の数よりも多くしてあることを特徴とする。
【００２５】
このようにすれば、整流効果が高まる。
【００２６】
好ましくは、第一整流部材及び第二整流部材の整流路の数を、ともに１５以上３５以下とする。
【００２７】
このようにすれば、整流効果が確実に得られる。
【００２８】
請求項１１に係る発明は、請求項４，６，７，８に係る発明の下位概念であって、第一整流部材と第二整流部材をノズル本体又はニードルに固定し、ノズル本体とニードルのうち整流部材を固定する方と、第一整流部材と、第二整流部材の少なくとも２つに係合部をそれぞれ設け、係合部が、給水孔の中心、第一整流部材の整流路あるいは整流フィンのうちいずれかの中心、及び第二整流部材の整流路又は整流フィンのうちいずれかの中心のうち２以上を一致させることを特徴とする。
【００２９】
このようにすれば、部品同士の中心を合わせる作業が容易になる。
【００３０】
【発明の実施の形態】
流体噴射式織機の緯入れノズルは図１に示すように、ニードル１をノズル本体２の中空部３に挿入し、ニードル１の先部とノズル本体２の間に環状の流路を形成し、その流路の後部を環状室４とし、その流路の先部に第一、第二整流部材５、６を圧入して緯糸進行方向に順番に配置し、第一、第二整流部材５，６とニードル１との間に流路を形成し、ニードル１と第二整流部材６の先端との間に流体の噴射孔７を形成してある。筒状をなすノズルホルダー８の先部の挿入孔９にノズル本体２を通し、ノズル本体２の先部外側にノズルキャップ１０をねじこんでノズルホルダー８にノズル本体２を固定し、ノズルホルダー８内の送水路１１に連通する環状溝１２を、ノズル本体２の外周面に形成し、環状溝１２と環状室４を連通する複数の給水孔１３を、ノズル本体２の円周方向に等間隔で傾斜して形成してある。
【００３１】
ニードル１は、導糸孔１４をその軸線方向に貫通しており、環状の流路に面する外径部分を段差状に細くし且つ先細り形状とし、その先端部を噴射孔７よりも突出させてある。また、ニードル１は、その基部側をノズル本体２にネジで連結し、ネジでの連結部分と環状室４との間の部分では、ノズル本体２の内面とＯリングでシールしてある。
【００３２】
ノズル本体２は、噴射孔７よりも先端側の内径を段差状に狭くすることによって、第二整流部材５を環状室４から脱出不能に収容する。ノズル本体２は、ノズルホルダー８の挿入孔９との間をＯリングでシールしてある。また、ノズルキャップ１０の端面とノズルホルダー８の挿入孔９の近傍とノズル本体２をＯリングでシールしてある。
【００３３】
第一整流部材５は図１又は図２に示すように、環状室４よりも緯糸進行方向側に配置されており、円筒状のワッカ１５の内側に整流フィン１６を円周方向に沿って等間隔をあけて複数設けてある。整流フィン１６は、ニードル１の軸線を中心とする放射方向については、ワッカ１５の内周面からニードル１の外周面に達する手前まで延長し、整流フィン１６とニードル１の外周面との間に間隔をあけ、軸線方向については、ワッカ１５の環状室４側の端面から第二整流部材６側の端面の手前まで延長してある。隣接する整流フィン１６，１６の間を整流路としての整流溝１７とし、整流溝１７内に流体を通過させると共に、整流フィン１６とニードル１の外周面との間隔にも流体を通過させる。
【００３４】
第二整流部材６は図１又は図２に示すように、ワッカ１８の内周面を噴射孔７に向かって径が小さくなるテーパ状に形成し、ワッカ１８の内側に整流フィン１９を円周方向に沿って等間隔をあけて複数設けてある。テーパー状のワッカ１８の内周面は、噴射孔７の手前までは急な勾配で、その後は緩やかな勾配としてある。その整流フィン１９は、ニードル１の軸線を中心とする放射方向については、ワッカ１８の内周面からニードル１の外周面に達する手前まで延長し、整流フィン１９とニードル１の外周面との間に間隔をあけると共に、軸線方向については、噴射孔７に近づくにつれて放射方向の幅が狭くなる三角形状で、第一整流部材５側の端面からテーパーの勾配が変わる境目まで延長してある。また、隣接する整流フィン１９，１９の間に整流溝２０を設けてある。
【００３５】
図１に示すように、第一整流部材５の整流フィン１６と第二整流部材６の整流フィン１９との間には隙間２１をあけてある。隙間２１は、０．１ｍｍ以上数ｍｍ以下とする。
【００３６】
図２には、第一整流部材５の整流溝１７の数と第二整流部材６の整流溝２０の数を、６以上４０以下で且つ互いに公約数を有しない数とし、給水孔１３の数を４以上２６以下にし、第一整流部材５の整流溝１７の数を給水孔１３の数の１．５倍以上の数とし、且つ給水孔１３の数と第一整流部材５の整流溝１７を互いに公約数を有しない数とした一例が示してある。図面では、給水孔１３の数が７、第一整流部材５の整流溝１７の数が１５、第二整流部材６の整流溝２０の数が１７としてある。
【００３７】
また、上述した条件を満足する給水孔１３の数と第一整流部材５の整流溝１７の数との関係が表１には具体的に示してある。なお、給水孔１３の数が１３以上２６以下のときの第一整流部材５の整流溝１７の数との関係は、データが膨大になるので省略してある。給水孔１３の数が６のときの第一整流部材５の整流溝１７の数と第二整流部材６の整流溝２０の数との関係が表２に示してある。なお、給水孔１３の数が６以外の数のときの、第一整流部材５の整流溝１７の数と第二整流部材６の整流溝２０の数との関係は、データが膨大になるので省略してある。
【００３８】
【表１】

【００３９】
【表２】

【００４０】
給水孔１３の数と第一整流部材５の整流溝１７の数との関係は、給水孔１３の数が６から１２で、第一整流部材５の整流溝１７の数が１２から３６の範囲が望ましい。また、第一整流部材５の整流溝１７の数と第二整流部材６の整流溝２０の数を１５から３５の範囲にすることが望ましい。第二整流部材６の整流溝２０の数を、給水孔１３の数と、第一整流部材５の整流溝１７の数よりも多くすることが、整流効果を高める上で望ましい。第二整流部材６の整流溝２０の数を第一整流部材５の整流溝１７の数の近くの数にすると、乱流が生じにくくなる効果が向上する。
【００４１】
図３には、給水孔１３の数を４以上１２以下とする一方、第一整流部材５の整流溝１７の数を、給水孔１３の数の１倍以上の整数倍の数とし、且つ給水孔１３の中心と第一整流部材５の整流溝１７の中心を一致した一例が示してある。図面では、給水孔１３の数を４に、第一整流部材５の整流溝１７の数を８にして、２倍にしてある。
【００４２】
第一整流部材５の８つの整流溝１７のうち４つの中心を、給水孔１３の中心と一致してあるので、給水孔１３からその４つの整流溝１７には、流体が真っ直ぐ流れ込む。一方、整流溝１７のうち残りの４つは、隣接する２つの給水孔１３と同じ距離（角度）となるので、２つの給水孔１３から各整流溝１７に均等に流体が流れ込む。従って、流体の旋回流の発生が抑制され、噴射孔７からのジェット流の拡散を抑えられる。
【００４３】
図３に対し、給水孔１３の中心と第一整流部材５の整流フィン１６の中心とを一致させるように配置することも考えられる。つまり、ワッカ１５を軸心を中心に約２２．５°回転されたものを想定したとき、第一整流部材５の８つの整流フィン１６のうち４つの中心を、給水孔１３の中心と一致するように配置されるため、給水孔１３からの流体が整流フィン１６により左右に分かれ、隣接する２つの整流溝１７に均等に流れ込む。従って、流体の旋回流が抑制され、噴射孔７からのジェット流の拡散が抑えられる。
【００４４】
図４には、第一整流部材５と第二整流部材６の各整流溝１７，２０の数を６以上４０以下で、且つ第二整流部材６の整流溝２０の数を第一整流部材５の整流溝１７の数に対してＫ倍あるいは１／Ｋ倍の整数に定めると共に、Ｋは２以上の整数とし、第一整流部材５の整流溝１７の中心あるいは整流フィン１６の中心のいずれかと、第二整流部材６の整流溝２０あるいは整流フィン１９のいずれかの中心とが一致する一例を示してある。図面では、第一整流部材５の整流溝１７の数を６とし、第二整流部材６の整流溝２０の数を１２とし、第一整流部材５の整流フィン１９の中心と、第二整流部材６の整流溝２０の中心を一致してある。
【００４５】
図４で示した第二整流部材６を、軸線を中心として１５度回転させると、図５に示すように、第一整流部材５の整流フィン１６の中心と、第二整流部材６の整流フィン１９の中心が一致する。
【００４６】
また、上述した第一整流部材５の整流溝１７と第二整流部材６の整流溝２０の数の条件を満足する関係が表３に示してある。なお、第一整流部材５の整流溝１７の数が７以下のときの第一整流部材５の整流溝２０の数との関係は省略してある。
【００４７】
【表３】

【００４８】
給水孔１３の数を４以上２６以下とする一方、第一整流部材５の整流溝１７の数を給水孔１３の数の１倍以上の整数倍の数とするという条件を満足する関係が表４に具体的に示してある。なお、給水孔１３の数が１３以上２６以下のときの第一整流部材５の整流溝１７の数との関係は省略してある。
【００４９】
【表４】

【００５０】
図６は、ノズル本体２とニードル１のうち整流部材５，６を固定する方と、第一整流部材５と、第二整流部材６の少なくとも２つに係合部２２，２３をそれぞれ設け、係合部が、給水孔１３の中心、第一整流部材５の整流溝１７又は整流フィン１６の中心、及び第二整流部材６の整流溝２０又は整流フィン１９の中心のうち２以上を一致させる一例を示したものである。図面では、ノズル本体２に整流部材５，６を固定し、第一整流部材５の整流溝１７の中心、第二整流部材６の整流溝２０の中心を一致させる係合部２２、２３を、第一整流部材５と第二整流部材６の突き合わせる端面同士に凹凸形状として設けてある。このような係合部２２、２３は、給水孔１３の中心と第一整流部材５の整流溝１７の中心または整流フィン１６の中心とを一致するように配置すべく、ノズル本体２の中空部３の内周面と第一整流部材５の外周面との間に形成されてもよい。また、前者と後者を同時に設けることも考えられる。
【００５１】
第二整流部材６の形状は、前述した形状に限られず、図７に示すように、整流溝１７を、軸線方向については噴射孔７まで延長したものでも良い。また、図８に示すように、整流フィン１９を設ける部品２４と、断面円弧状のオリフィスからなる部品２５との二部品から構成しても良い。さらに、図９に示すように、整流フィン１９を設ける部品２４と、噴射孔７を有する単なるドーナツ板からなる部品２５との二部品から構成しても良い。また、第一整流部材５の形状も、前述した形状に限られず、図８に示すように、整流フィン１６を軸線方向については環状室４に突入するまで延長しても良い。なお、上記した第一整流部材５の整流溝１７を、整流孔に置き換えることも可能である。より具体的には、図１２に示すように、ドーナツ状に形成されノズル本体２とニードル１との間に設けられる第一整流部材５に、円周方向に等間隔に丸孔または角孔により形成される整流孔３０を設けることが考えられる。この場合、上記した整流溝の数は、整流孔の数に読み替えればよい。さらには、ノズル本体２をノズルホルダー８と別体に設けているが、一体に設けてもよい。
【００５２】
図１０の（イ）は、第一整流部材５の整流溝１７の数を１６、第二整流部材６の整流溝２０の数を１７とした場合に予想されるジェット流の断面形状を示し、図１０の（ロ）は、第一整流部材５の整流溝１７の数を１５、第二整流部材６の整流溝２０の数を１７とした場合に予想されるジェット流の断面形状を示しており、何れも真円に近い形状となっていることが理解できる。
【００５３】
各種部材の数や中心の位置合わせに関する実験結果が、表５に示してある。実験の織機条件は、織物通し幅：１７８０ｍｍ、織物：ポリエステルタフタ、緯糸：ナイロン７０ｄ（デニール）／ポリエステル７５ｄ、ポンプからの供給圧力１００ｋｇｆ／ｃｍ^２、使用水量２．２ｃｃ／ｐｉｃｋである。
【００５４】
【表５】

【００５５】
この表５からは以下のことが把握できる。整流フィン１６，１９の数を増やしても、織物に縦筋が付くことを改善できない。給水孔１３の中心と第一整流部材５の中心の位置合わせ、第一整流部材５の整流溝１７の中心と第二整流部材６の整流溝２０の中心の位置合わせが、品位を改善するポイントとなる。
【００５６】
【発明の効果】
本発明のようにすれば、ニードルとノズル本体の間から噴射されるジェット流の断面形状が、従来よりも真円に近い形状になり、経糸開口に衝突し難くなり、織物欠点（縦筋）を効果的に防止できる。
【図面の簡単な説明】
【図１】流体噴射式織機の緯入れノズルの構造を示す断面図である。
【図２】（イ）（ロ）
図１のＡ−Ａ線断面図、図１のＢ−Ｂ線断面図である。
【図３】給水孔数が４、第一整流部材の整流溝数が８の例を示す断面図である。
【図４】（イ）（ロ）
（イ）図は、給水孔数が６、第一整流部材の整流溝数が６の例を示す断面図、
、（ロ）図は、そのときの第二整流部材の整流溝数が１２の例を示す断面図である。
【図５】図４（ロ）の整流溝を１５度回転させた状態を示す断面図である。
【図６】第一整流部材と第二整流部材の係合部を示す断面図である。
【図７】第二整流部材の変形例を示す断面図である。
【図８】第一整流部材と第二整流部材の変形例を示す断面図である。
【図９】第二整流部材の変形例を示す断面図である。
【図１０】（イ）（ロ）
異なる条件でのジェット流の断面形状を示す一例である。
【図１１】従来のジェット流の断面形状を示す一例である。
【図１２】第一整流部材の整流路を整流孔で形成した例を示す断面図である。
【符号の説明】
１　ニードル
２　ノズル本体
３　中空部
５　第一整流部材
６　第二整流部材
１３　給水孔
１４　導糸孔
１６、１９　整流フィン
１７、２０、３０　整流路（整流溝、整流孔）
２１　隙間
２２、２３　係合部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a weft insertion nozzle of a fluid jet loom.
[0002]
[Prior art]
As a weft insertion nozzle of a conventional fluid jet loom, a needle is inserted into the nozzle body, an annular flow path is formed between the tip of the needle and the nozzle body, and two flow regulating members are provided in the flow path. Some of the nozzle bodies are provided with an appropriate number of water supply holes on the upstream side of the flow path, and the nozzle body injects fluid from an injection hole between the downstream straightening member and the needle. The rectifying member has a cylindrical shape as a whole, and radial rectifying fins are provided at equal intervals in a circumferential direction, and a fluid is passed through a rectifying groove formed between adjacent rectifying fins. The rectifying member has 16 rectifying fins, and the downstream rectifying member has 18 rectifying fins (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2000-119937 (page 3, left column, page 4, right column, FIG. 5, FIG. 6)
[0004]
[Problems to be solved by the invention]
However, the above-mentioned conventional device does not consider the degree of overlap between the upstream and downstream flow straightening grooves (the relationship between the center of the upstream flow straightening groove and the center of the downstream flow straightening groove). If the number of rectifying fins differs between the upstream and downstream rectifying members, the degree of overlap between the upstream and downstream rectifying grooves differs for each rectifying groove. Then, the flow velocity of the fluid passing through the straightening groove is different for each straightening groove, and a swirling flow is generated in the fluid around the needle. As a result, a portion having a large flow rate and a portion having a small flow rate are generated, and the jet from the injection hole is generated. The cross-sectional shape of the flow tends to be out of a perfect circle. In particular, when a common divisor other than an integral multiple exists between the number of upstream rectifying fins and the number of downstream rectifying fins, the tendency is remarkable. For example, as described above, when the number of the upstream rectifying fins is 16, the number of the downstream rectifying fins is 18, and the common divisor of both the numbers is 2, the center of the upstream rectifying groove and the downstream of the downstream rectifying groove are two. When the center of the rectifying groove on the side is coincident, as shown in FIG. 11, the cross-sectional shape of the jet flow becomes the most bulging at the position where the degree of overlap of the center of the rectifying groove is greatest, that is, a flat shape protruding in two directions. Expected. When the jet flow has a shape deviating from a perfect circle in this way, there is a problem that diffusion is increased or a fabric defect (vertical streak) occurs due to collision with the warp shed.
[0005]
In addition, the above-mentioned conventional one has a gap dimension between the upstream and downstream rectifying fins, a relationship between the number of water supply holes and the number of rectification grooves, and a condition of communication between the water supply holes and the rectification grooves (the number of water supply holes). No description is made about the relationship between the center and the center of the rectifying groove). However, these also cause the above-mentioned problems.
[0006]
Therefore, the problem to be solved by the present invention is to optimize the number of rectifying grooves of a plurality of rectifying members, and at the same time, to measure the gap size between the rectifying fins on the upstream and downstream sides, the number of water supply holes, and the number of rectifying grooves. It is to optimize each relation of numbers.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 includes a needle having a yarn introduction hole and a water supply hole formed in a hollow shape and penetrating the hollow portion, while the needle is inserted into the hollow portion and the water supply hole is provided between the needle. It comprises a nozzle body constituting an annular flow path communicating therewith, and a plurality of rectification members arranged in the annular flow path in order in the weft traveling direction, and each rectification member is provided at an equal interval in its circumferential direction and a shaft is provided. In the weft insertion nozzle of the fluid jet loom having a plurality of straightening paths extending in the respective directions, the number of each straightening path of the first straightening member and the second straightening member is a common divisor of 6 or more and 40 or less and each other. It is characterized in that the number does not have.
[0008]
As the weft insertion nozzle of the present case, the number of water supply holes provided may be one provided as a whole or a plurality of water supply holes may be provided. The rectifying member may be formed separately from both the nozzle body and the needle, or may be formed integrally with one of the nozzle body and the needle. Therefore, when the nozzle body and the rectifying member are integrally formed, the inner peripheral surface of the nozzle body having the rectifying fin is the inner peripheral surface of the nozzle body itself, and the nozzle main body and the rectifying member are separate bodies. When the rectifying member is press-fitted into the nozzle body, it refers to a rectifying path of the rectifying member. The same applies to the outer peripheral surface of the needle having the rectifying fins. Preferably, the second rectifying members constituting the plurality of rectifying members are provided at equal intervals in the circumferential direction and are on the other side from the outer peripheral surface of the needle or the nozzle body, as in the invention according to claims 2 and 3. It has a plurality of rectification fins each extending in the axial direction, and rectification grooves defined by adjacent rectification fins are configured as rectification paths. On the other hand, the first rectifying member has a rectifying groove formed as a rectifying path similarly to the second rectifying member as in the second aspect of the invention, or has a circumferential shape as in the third aspect of the invention. Rectifying holes formed at equal intervals in the direction and extending in the axial direction are configured as rectifying paths.
[0009]
Further, the outer peripheral surface of the needle having the rectifying fins or the inner peripheral surface of the nozzle body may have a tapered shape whose diameter decreases along the weft traveling direction, or may have the same diameter along the weft traveling direction. May be. Since a plurality of rectifying members are provided, two or more rectifying members are provided.
[0010]
If the number of rectifying paths of the first rectifying member and the number of rectifying paths of the second rectifying member are 5 or less, the flow rate of the fluid that hits the rectifying path increases, and the convergence of the fluid is poor. If it is 41 or more, the flow regulating fin needs to have a thickness that does not bend by the fluid, so that the nozzle body becomes large. In addition, if the size is forcibly reduced, the rectifying fins become thinner, causing vibration due to the fluid, and lowering the strength and durability. Therefore, if the number is 6 or more and 40 or less, the convergence and durability of the fluid are good, and the weft insertion nozzle can be reduced in size.
[0011]
In addition, since the number of rectifying paths of the first rectifying member and the number of rectifying paths of the second rectifying member do not have a common divisor, the center of the water supply hole and the rectifying path of the first rectifying member or any of the rectifying fins is not included. Even if the centers are aligned, the number at which the centers coincide with each other is at most one, and since the number is smaller than that in which the common divisor 2 exists, the cross-sectional shape becomes less diffused and the jet flow nearly circular can get. Therefore, the work of aligning the center of the water supply hole with the center of the rectifying path of the first rectifying member becomes unnecessary.
[0012]
The invention according to claim 4 is that, while the number of water supply holes is 4 or more and 26 or less, the number of rectification paths of the first rectification member is an integer multiple of 1 time or more of the number of water supply holes, and And the center of any one of the flow straightening path and the flow straightening fin of the first flow straightening member.
[0013]
When the number of water supply holes is smaller than the number of flow straightening paths of the first flow straightening member, it is actually impossible to match the centers of all the flow straightening paths with the centers of the water feeding holes, but here, ""Matching the center of the water supply hole with the center of the flow straightening path of the first flow straightening member" means that the center of the number of flow straightening paths corresponding to the number of water feeding holes is matched with the center of the water feeding hole. The coincidence of the centers means that the centers in both circumferential width directions are arranged on one radiation centered on the axial direction of the needle.
[0014]
If the number of water supply holes is 3 or less, the flow rate per water supply hole increases, and turbulence tends to occur. If it is 27 or more, the nozzle body becomes large due to strength problems. Therefore, in the case of 4 or more and 26 or less, the nozzle body can be miniaturized without generating turbulence.
[0015]
When the number of rectification paths of the first rectification member is an integer multiple of 1 or more times the number of water supply holes, and the center of the water supply hole coincides with the center of either the rectification path of the first rectification member or the rectification fin. The fluid flowing out of the entire straightening path of the first straightening member does not generate a swirling flow as a whole. For example, in the case where the number of rectification paths is twice the number of water supply holes, the reason for the above effect will be described in detail. Fluid flows straight into the rectification path of which the center of the first rectification member coincides with the center of the water supply hole. Fluid also flows from the water supply hole to the rectification path whose center does not coincide with the center of the water supply hole, but since both the rectification path and the water supply hole are provided at equal intervals, it is closest to each rectification path whose center does not coincide. There are two water supply holes respectively. Therefore, since the fluid flows evenly from the two water supply holes into the rectification path whose centers do not coincide, no swirling flow occurs.
[0016]
In the invention according to claim 5, while the number of water supply holes is 4 or more and 26 or less, the number of rectification paths of the first rectification member is set to 1.5 times or more the number of water supply holes, and The number and the number of rectifying paths of the first rectifying member are numbers having no common divisor.
[0017]
1.5 times is a value obtained empirically. If it is less than 1.5 times, the rectification is not performed efficiently, and a turbulent flow is generated when flowing into the rectification passage from the water supply hole, which causes the diffusion of the jet water flow.
[0018]
The invention according to claim 6 has a needle having a yarn introduction hole and a water supply hole formed in a hollow shape and penetrating the hollow portion, while the needle is inserted into the hollow portion and the water supply hole is provided between the needle. It comprises a nozzle body constituting an annular flow path communicating therewith, and a plurality of rectifying members arranged in the annular flow path in order in the weft traveling direction, and each rectifying member is provided at equal intervals in its circumferential direction, and It has a plurality of rectifying fins extending from one of the outer peripheral surface of the needle and the inner peripheral surface of the nozzle body to the other side and the axial direction, respectively, and has a rectifying groove defined by an adjacent rectifying fin as a rectifying path. In the weft insertion nozzle of the fluid jet loom, the number of each straightening path of the first straightening member and the second straightening member is 6 to 40, and the number of straightening paths of the second straightening member is K times or 1 times the number of rectification paths K is an integer of 2 or more, and K is an integer of 2 or more. The center of one of the rectifying path or the rectifying fin of the first rectifying member and the center of one of the rectifying path or the rectifying fin of the second rectifying member. Are matched.
[0019]
According to a seventh aspect of the present invention, in the first and second rectifying members constituting the plurality of rectifying members, the first rectifying members are provided so as to extend in the circumferential direction at equal intervals and in the axial direction. While having a hole as a rectification path, the second rectification member has a plurality of rectification fins provided at equal intervals in the circumferential direction and extending from the outer peripheral surface of the needle or the nozzle body to the other side and the axial direction, respectively. Assuming a weft insertion nozzle having a rectifying groove defined by an adjacent rectifying fin as a rectifying path, the number of each rectifying path of the first rectifying member and the second rectifying member is the same as that of the invention according to claim 6. In addition, the center of the rectifying hole of the first rectifying member and the center of one of the rectifying groove and the rectifying fin of the second rectifying member coincide with each other.
[0020]
When the relationship between the number of rectification paths of the first rectification member and the number of rectification paths of the second rectification member coincides with the center of the rectification path or the like while satisfying the relationship of an integer multiple of 2 or more, a value other than the integer multiple is used. Compared with a conventional product having a common divisor of 2, the number of centers of the flow straightening paths coincides with each other greatly, and the cross-sectional shape of the jet flow becomes closer to a circle.
[0021]
The invention according to claim 8 is a subordinate concept of the invention according to

claims

6 and 7, wherein the number of water supply holes is 4 or more and 26 or less, and the number of rectification paths of the first rectification member is the number of water supply holes. And the center of one of the rectifying fins or the rectifying path of the first rectifying member coincides with the center of the water supply hole.
[0022]
The invention according to claim 9 is characterized in that a gap is provided between the rectifying fin of the first rectifying member and the rectifying fin of the second rectifying member. Preferably, the gap is 0.1 mm or more and several mm or less.
[0023]
If the rectifying fin of the first rectifying member and the rectifying path of the second rectifying member overlap with each other when the distance is less than 0.1 mm, it is difficult for the fluid to flow through the rectifying path of the second rectifying member. In any case, the rectification function is reduced due to the occurrence of flow.
[0024]
The invention according to claim 10 is characterized in that the number of rectifying paths of the second rectifying member is larger than the number of rectifying paths of the first rectifying member.
[0025]
By doing so, the rectifying effect is enhanced.
[0026]
Preferably, the number of rectification paths of the first rectification member and the second rectification member is both 15 or more and 35 or less.
[0027]
In this way, a rectifying effect can be reliably obtained.
[0028]
The invention according to claim 11 is a subordinate concept of the invention according to

claims

4, 6, 7, and 8, wherein the first rectifying member and the second rectifying member are fixed to the nozzle body or the needle, and the nozzle body and the needle are connected. At least two of the members for fixing the rectifying member, the first rectifying member, and the second rectifying member are provided with engaging portions, respectively, and the engaging portion is provided at the center of the water supply hole, the rectifying path of the first rectifying member or the rectifying member. The center of any one of the fins and the center of any one of the rectification path or the rectification fin of the second rectification member may be matched.
[0029]
This facilitates the operation of aligning the centers of the components.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, the weft insertion nozzle of the fluid jet loom inserts the needle 1 into the hollow portion 3 of the nozzle body 2 to form an annular flow path between the tip of the needle 1 and the nozzle body 2. The rear part of the flow path is an annular chamber 4, and first and

second rectification members

5 and 6 are press-fitted into the front part of the flow path and arranged in order in the weft traveling direction. A flow path is formed between the needle 6 and the needle 1, and a fluid injection hole 7 is formed between the needle 1 and the tip of the second rectifying member 6. The nozzle body 2 is passed through the insertion hole 9 at the tip of the cylindrical nozzle holder 8, and the nozzle cap 10 is screwed outside the tip of the nozzle body 2 to fix the nozzle body 2 to the nozzle holder 8. An annular groove 12 communicating with the water supply passage 11 is formed on the outer peripheral surface of the nozzle body 2, and a plurality of water supply holes 13 communicating the annular groove 12 and the annular chamber 4 are formed at regular intervals in the circumferential direction of the nozzle body 2. It is formed with an inclination.
[0031]
The needle 1 penetrates the yarn introduction hole 14 in the axial direction thereof, and the outer diameter portion facing the annular flow path is tapered and formed into a stepped shape, and the tip portion is projected from the injection hole 7. It is. The base of the needle 1 is connected to the nozzle main body 2 with a screw, and a portion between the connection portion with the screw and the annular chamber 4 is sealed with the inner surface of the nozzle main body 2 by an O-ring.
[0032]
The nozzle main body 2 accommodates the second rectifying member 5 so as not to be able to escape from the annular chamber 4 by making the inner diameter at the tip end side of the injection hole 7 narrower in a stepped manner. The nozzle body 2 is sealed with an O-ring between the nozzle holder 8 and the insertion hole 9. The end face of the nozzle cap 10, the vicinity of the insertion hole 9 of the nozzle holder 8, and the nozzle body 2 are sealed with an O-ring.
[0033]
As shown in FIG. 1 or FIG. 2, the first rectifying member 5 is disposed closer to the weft advancing direction than the annular chamber 4, and rectifying fins 16 are arranged inside the cylindrical washer 15 along the circumferential direction. A plurality is provided at intervals. The rectifying fin 16 extends in the radial direction about the axis of the needle 1 from the inner peripheral surface of the washer 15 to just before reaching the outer peripheral surface of the needle 1, and is located between the rectifying fin 16 and the outer peripheral surface of the needle 1. In the axial direction, there is an interval extending from the end face of the washer 15 on the side of the annular chamber 4 to just before the end face of the second straightening member 6. A rectifying groove 17 as a rectifying path is provided between the

adjacent rectifying fins

16, 16, and the fluid is allowed to pass through the rectifying groove 17 and also to pass through the gap between the rectifying fin 16 and the outer peripheral surface of the needle 1.
[0034]
As shown in FIG. 1 or FIG. 2, the second rectifying member 6 is formed such that the inner peripheral surface of the washer 18 is formed in a tapered shape whose diameter decreases toward the injection hole 7, and a rectifying fin 19 is formed inside the washer 18. A plurality are provided at equal intervals along the direction. The inner peripheral surface of the tapered wacker 18 has a steep gradient up to just before the injection hole 7 and a gentle gradient thereafter. The rectifying fin 19 extends in the radial direction about the axis of the needle 1 from the inner peripheral surface of the washer 18 to a position just before reaching the outer peripheral surface of the needle 1, and is provided between the rectifying fin 19 and the outer peripheral surface of the needle 1. In the axial direction, it has a triangular shape in which the width in the radial direction becomes narrower as approaching the injection hole 7, and extends from the end face on the first rectifying member 5 side to the boundary where the slope of the taper changes. A rectifying groove 20 is provided between adjacent rectifying

fins

19, 19.
[0035]
As shown in FIG. 1, a gap 21 is provided between the rectifying fin 16 of the first rectifying member 5 and the rectifying fin 19 of the second rectifying member 6. The gap 21 is not less than 0.1 mm and not more than several mm.
[0036]
In FIG. 2, the number of the rectifying grooves 17 of the first rectifying member 5 and the number of the rectifying grooves 20 of the second rectifying member 6 are not less than 6 and not more than 40 and have no common divisor, and the number of the water supply holes 13. Is not less than 4 and not more than 26, the number of the rectifying grooves 17 of the first rectifying member 5 is 1.5 times or more the number of the water supply holes 13, and the number of the water supplying holes 13 and the rectifying grooves 17 of the first rectifying member 5 are Are shown as numbers having no common divisor with each other. In the drawing, the number of water supply holes 13 is 7, the number of rectifying grooves 17 of the first rectifying member 5 is 15, and the number of rectifying grooves 20 of the second rectifying member 6 is 17.
[0037]
Table 1 specifically shows a relationship between the number of the water supply holes 13 satisfying the above-described conditions and the number of the rectifying grooves 17 of the first rectifying member 5. The relationship between the number of the water supply holes 13 and the number of the rectifying grooves 17 of the first rectifying member 5 when the number of the water supply holes 13 is 13 or more and 26 or less is omitted because the data becomes enormous. Table 2 shows the relationship between the number of rectifying grooves 17 of the first rectifying member 5 and the number of rectifying grooves 20 of the second rectifying member 6 when the number of the water supply holes 13 is six. When the number of the water supply holes 13 is a number other than 6, the relationship between the number of the rectifying grooves 17 of the first rectifying member 5 and the number of the rectifying grooves 20 of the second rectifying member 6 is enormous. Omitted.
[0038]
[Table 1]

[0039]
[Table 2]

[0040]
The relationship between the number of water supply holes 13 and the number of flow straightening grooves 17 of the first flow straightening member 5 is such that the number of water feed holes 13 is 6 to 12, and the number of flow straightening grooves 17 of the first flow straightening member 5 is 12 to 36. Is desirable. Further, it is desirable that the number of the rectifying grooves 17 of the first rectifying member 5 and the number of the rectifying grooves 20 of the second rectifying member 6 be in the range of 15 to 35. It is desirable to increase the number of flow straightening grooves 20 of the second flow straightening member 6 more than the number of water supply holes 13 and the number of flow straightening grooves 17 of the first flow straightening member 5 in order to enhance the flow straightening effect. When the number of rectification grooves 20 of the second rectification member 6 is set to a number close to the number of rectification grooves 17 of the first rectification member 5, the effect of making turbulence less likely to occur is improved.
[0041]
In FIG. 3, while the number of the water supply holes 13 is set to 4 or more and 12 or less, the number of the rectification grooves 17 of the first rectification member 5 is set to an integer multiple of 1 time or more of the number of the water supply holes 13, and the water supply is performed. An example is shown in which the center of the hole 13 matches the center of the rectifying groove 17 of the first rectifying member 5. In the drawing, the number of water supply holes 13 is four, and the number of rectifying grooves 17 of the first rectifying member 5 is eight, which is doubled.
[0042]
Since the center of four of the eight straightening grooves 17 of the first straightening member 5 coincides with the center of the water supply hole 13, the fluid flows straight into the four straightening grooves 17 from the water supply hole 13. On the other hand, the remaining four of the rectifying grooves 17 have the same distance (angle) as the two adjacent water supply holes 13, so that the fluid flows evenly into the rectification grooves 17 from the two water supply holes 13. Therefore, the generation of the swirling flow of the fluid is suppressed, and the diffusion of the jet flow from the injection holes 7 can be suppressed.
[0043]
It is also conceivable that the center of the water supply hole 13 and the center of the rectifying fin 16 of the first rectifying member 5 are arranged to coincide with each other in FIG. That is, assuming that the washer 15 is rotated about 22.5 ° about the axis, four centers of the eight rectifying fins 16 of the first rectifying member 5 coincide with the center of the water supply hole 13. As a result, the fluid from the water supply hole 13 is divided into right and left by the rectifying fins 16 and evenly flows into two adjacent rectifying grooves 17. Therefore, the swirling flow of the fluid is suppressed, and the diffusion of the jet flow from the injection holes 7 is suppressed.
[0044]
FIG. 4 shows that the number of rectifying

grooves

17 and 20 of the first rectifying member 5 and the second rectifying member 6 is 6 or more and 40 or less, and the number of rectifying grooves 20 of the second rectifying member 6 is And K is an integer of 2 or more with respect to the number of the rectifying grooves 17, and K is an integer of 2 or more, and is equal to either the center of the rectifying groove 17 of the first rectifying member 5 or the center of the rectifying fin 16. An example is shown in which the center of either the rectifying groove 20 or the rectifying fin 19 of the second rectifying member 6 coincides with the center. In the drawing, the number of the rectifying grooves 17 of the first rectifying member 5 is 6, the number of the rectifying grooves 20 of the second rectifying member 6 is 12, the center of the rectifying fin 19 of the first rectifying member 5, and the second rectifying member 5. The center of the straightening groove 20 of 6 is aligned.
[0045]
When the second rectifying member 6 shown in FIG. 4 is rotated by 15 degrees around the axis, as shown in FIG. 5, the center of the rectifying fin 16 of the first rectifying member 5 and the rectifying fin of the second rectifying member 6 are changed. Nineteen centers coincide.
[0046]
Table 3 shows a relationship that satisfies the condition of the number of the rectifying grooves 17 of the first rectifying member 5 and the number of rectifying grooves 20 of the second rectifying member 6 described above. The relationship with the number of rectifying grooves 20 of the first rectifying member 5 when the number of rectifying grooves 17 of the first rectifying member 5 is 7 or less is omitted.
[0047]
[Table 3]

[0048]
The relationship satisfying the condition that the number of the water supply holes 13 is 4 or more and 26 or less, and the number of the rectification grooves 17 of the first rectification member 5 is an integer multiple of 1 time or more of the number of the water supply holes 13 is shown in the table. 4 specifically. Note that the relationship with the number of rectifying grooves 17 of the first rectifying member 5 when the number of the water supply holes 13 is 13 or more and 26 or less is omitted.
[0049]
[Table 4]

[0050]
FIG. 6 shows that at least two of the nozzle body 2 and the needle 1 for fixing the rectifying

members

5 and 6 and the first rectifying member 5 and the second rectifying member 6 are provided with engaging portions 22 and 23, respectively. The engaging portion matches two or more of the center of the water supply hole 13, the center of the rectifying groove 17 or the rectifying fin 16 of the first rectifying member 5, and the center of the rectifying groove 20 or the rectifying fin 19 of the second rectifying member 6. An example is shown. In the drawing, the rectifying

members

5 and 6 are fixed to the nozzle body 2, and the engaging portions 22 and 23 that match the center of the rectifying groove 17 of the first rectifying member 5 with the center of the rectifying groove 20 of the second rectifying member 6 are provided. The end surfaces of the first rectifying member 5 and the second rectifying member 6 that abut each other are provided as irregularities. The engaging portions 22 and 23 are provided in the hollow portion of the nozzle body 2 so that the center of the water supply hole 13 and the center of the rectifying groove 17 of the first rectifying member 5 or the center of the rectifying fin 16 coincide. 3 and an outer peripheral surface of the first rectifying member 5. It is also conceivable to provide the former and the latter at the same time.
[0051]
The shape of the second rectifying member 6 is not limited to the above-described shape, and may be such that the rectifying groove 17 is extended to the injection hole 7 in the axial direction as shown in FIG. Further, as shown in FIG. 8, two parts, that is, a part 24 provided with the rectifying fin 19 and a part 25 having an orifice having an arc-shaped cross section may be used. Further, as shown in FIG. 9, it may be composed of two parts, that is, a part 24 provided with the rectifying fin 19 and a part 25 made of a simple donut plate having the injection holes 7. Further, the shape of the first rectifying member 5 is not limited to the above-described shape, and the rectifying fin 16 may be extended in the axial direction until it protrudes into the annular chamber 4 as shown in FIG. In addition, it is also possible to replace the rectifying groove 17 of the first rectifying member 5 with a rectifying hole. More specifically, as shown in FIG. 12, a first straightening member 5 formed in a donut shape and provided between the nozzle body 2 and the needle 1 is provided with round holes or square holes at equal intervals in the circumferential direction. It is conceivable to provide a rectifying hole 30 to be formed. In this case, the number of rectifying grooves may be replaced with the number of rectifying holes. Further, although the nozzle body 2 is provided separately from the nozzle holder 8, it may be provided integrally.
[0052]
FIG. 10A shows the cross-sectional shape of the jet flow expected when the number of the flow straightening grooves 17 of the first flow straightening member 5 is 16 and the number of the flow straightening grooves 20 of the second flow straightening member 6 is 17. FIG. 10B shows the cross-sectional shape of the jet flow expected when the number of the rectifying grooves 17 of the first rectifying member 5 is 15 and the number of the rectifying grooves 20 of the second rectifying member 6 is 17. Therefore, it can be understood that each of them has a shape close to a perfect circle.
[0053]
Table 5 shows the experimental results regarding the number of various members and the alignment of the center. The weaving conditions of the experiment were: fabric passing width: 1780 mm, fabric: polyester taffeta, weft: nylon 70 d (denier) / polyester 75 d, supply pressure from the pump 100 kgf / cm ² , and water usage 2.2 cc / pick.
[0054]
[Table 5]

[0055]
From Table 5, the following can be understood. Even if the number of the

flow fins

16 and 19 is increased, it is impossible to improve the warp of the fabric. The point at which the alignment of the center of the water supply hole 13 with the center of the first rectifying member 5 and the alignment of the center of the rectifying groove 17 of the first rectifying member 5 with the center of the rectifying groove 20 of the second rectifying member 6 improve the quality. It becomes.
[0056]
【The invention's effect】
According to the present invention, the cross-sectional shape of the jet stream jetted from between the needle and the nozzle body becomes a shape closer to a perfect circle than before, making it difficult to collide with the warp shedding, and the fabric defect (vertical streak) Can be effectively prevented.
[Brief description of the drawings]
FIG. 1 is a sectional view showing the structure of a weft insertion nozzle of a fluid jet loom.
FIG. 2 (a) (b)
FIG. 2 is a sectional view taken along line AA of FIG. 1 and a sectional view taken along line BB of FIG. 1.
FIG. 3 is a cross-sectional view illustrating an example in which the number of water supply holes is four and the number of rectifying grooves of the first rectifying member is eight.
FIG. 4 (a) (b)
(A) The figure is a cross-sectional view showing an example in which the number of water supply holes is 6, and the number of rectifying grooves of the first rectifying member is 6.
(B) is a sectional view showing an example in which the number of rectification grooves of the second rectification member at that time is 12.
FIG. 5 is a cross-sectional view showing a state where the rectifying groove of FIG. 4B is rotated by 15 degrees.
FIG. 6 is a sectional view showing an engagement portion between a first rectifying member and a second rectifying member.
FIG. 7 is a sectional view showing a modification of the second rectifying member.
FIG. 8 is a sectional view showing a modified example of the first rectifying member and the second rectifying member.
FIG. 9 is a sectional view showing a modification of the second rectifying member.
FIG. 10 (a) (b)
It is an example which shows the cross-sectional shape of a jet stream under different conditions.
FIG. 11 is an example showing a cross-sectional shape of a conventional jet flow.
FIG. 12 is a cross-sectional view illustrating an example in which a rectifying path of a first rectifying member is formed by a rectifying hole.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 needle 2 nozzle body 3 hollow portion 5 first rectifying member 6 second rectifying member 13 water supply hole 14

yarn introduction hole

16, 19 rectifying

fins

17, 20, 30 rectifying path (rectifying groove, rectifying hole)
21 gaps 22, 23 engaging part

Claims

A needle (1) having a yarn introduction hole (14);
While having a water supply hole (13) formed in a hollow shape and penetrating the hollow portion (3), the needle (1) is inserted into the hollow portion (3) and communicates with the needle to the water supply hole (13). A nozzle body (2) forming an annular flow path;
A plurality of rectifying members (5, 6) arranged sequentially in an annular flow path in the weft traveling direction,
Each rectifying member (5, 6) has a plurality of rectifying paths (17, 30, 20) provided at equal intervals in the circumferential direction and extending in the axial direction, respectively, in a weft insertion nozzle of a fluid jet loom. ,
The number of each flow straightening path (17, 30, 20) of the first flow straightening member (5) and the second flow straightening member (6) is a number that is not less than 6 and not more than 40 and has no common divisor. Weft insertion nozzle for fluid jet loom.

The first and second rectifying members (5, 6) are provided at equal intervals in the circumferential direction, and extend from the outer peripheral surface of the needle (1) or the nozzle body (2) on the other side and in the axial direction, respectively. 2. Fluid according to claim 1, comprising a plurality of rectifying fins (16, 19) and having rectifying grooves (17, 20) defined by adjacent rectifying fins as the rectifying path (17, 20). Weft insertion nozzle of injection loom.

The first rectifying member (5) has rectifying holes (30) formed at regular intervals in the circumferential direction and extending in the axial direction as the rectifying path. A plurality of rectifying fins (19) provided at equal intervals in the circumferential direction and extending from the outer peripheral surface of the needle (1) or the nozzle body (2) on the other side and in the axial direction, respectively. The weft insertion nozzle for a fluid jet loom according to claim 1, wherein the flow straightening groove (20) defined by a fin is provided as the flow straightening path (20).

While the number of water supply holes (13) is 4 or more and 26 or less, the number of rectification paths (17, 30) of the first rectification member (5) is an integral multiple of 1 or more times the number of water supply holes (13). 4. The rectifying fin (16) of the first rectifying member or the center of one of the rectifying passages (17, 30) coincides with the center of the water supply hole (13). A weft insertion nozzle for the fluid jet loom according to any one of the preceding claims.

While the number of water supply holes (13) is not less than 4 and not more than 26, the number of rectification paths (17, 30) of the first rectification member (5) is set to a number 1.5 times or more of the number of water supply holes (13). The number of water supply holes (13) and the number of rectification paths (17, 30) of the first rectification member are numbers that do not have a common divisor with each other. Item 6. A weft insertion nozzle for a fluid jet loom according to item 5.

A needle (1) having a yarn introduction hole (14);
While having a water supply hole (13) formed in a hollow shape and penetrating the hollow portion (3), the needle (1) is inserted into the hollow portion (3) and communicates with the needle to the water supply hole (13). A nozzle body (2) forming an annular flow path;
A plurality of rectifying members (5, 6) arranged sequentially in an annular flow path in the weft traveling direction,
Each of the flow regulating members (5, 6) is provided at equal intervals in the circumferential direction, and is arranged from one of the outer peripheral surface of the needle (1) and the inner peripheral surface of the nozzle body (2) to the other side and in the axial direction. Weft insertion of a fluid jet loom having a plurality of rectifying fins (16, 19) each extending and having rectifying grooves (17, 20) defined by adjacent rectifying fins as rectifying paths (17, 20). At the nozzle
The number of rectification paths (17, 20) of the first rectification member (5) and the second rectification member (6) is 6 to 40, and the number of rectification paths (20) of the second rectification member (6) is The number of rectification paths (17) of the first rectification member (5) is determined to be an integer of K times or 1 / K times, and K is an integer of 2 or more;
The center of any one of the flow straightening path (17) or the flow straightening fin (16) of the first flow straightening member and the center of any one of the flow straightening path (20) or the flow straightening fin (19) of the second flow straightening member. A weft insertion nozzle for a fluid jet loom, characterized in that:

A needle (1) having a yarn introduction hole (14);
A water supply hole (13) is formed in a hollow shape and penetrates the hollow portion (3), while a needle (1) is inserted into the hollow portion (3) and communicates with the needle to the water supply hole (13). A nozzle body (2) constituting a flow path of
A plurality of rectifying members (5, 6) arranged sequentially in an annular flow path in the weft traveling direction,
The first rectifying member (5) has rectifying holes (30) provided at equal intervals in the circumferential direction and extending in the axial direction as rectifying paths, and the second rectifying member (6) has a circumferential direction. And a plurality of rectifying fins (19) which are provided at equal intervals and extend from the outer peripheral surface of the needle (1) or the nozzle body (2) on the other side and in the axial direction, respectively, and are defined by the adjacent rectifying fins. In a weft insertion nozzle of a fluid jet loom having a straightening groove (20) as a straightening path (20),
The number of rectification paths (30, 20) of the first rectification member (5) and the second rectification member (6) is 6 to 40, and the number of rectification paths (20) of the second rectification member (6) is The number of rectification paths (17) of the first rectification member (5) is determined to be an integer of K times or 1 / K times, and K is an integer of 2 or more;
The center of the straightening hole (30) of the first straightening member and the center of one of the straightening grooves (20) and the straightening fins (19) of the second straightening member coincide with each other. Weft insertion nozzle.

While the number of water supply holes (13) is not less than 4 and not more than 26, the number of rectification paths (17, 30) of the first rectification member (5) is an integer multiple of 1 or more times the number of water supply holes (13). The center of one of the rectifying fins (19) or the rectifying passages (17, 30) of the first rectifying member (5) coincides with the center of the water supply hole (13). Or a weft insertion nozzle of the fluid jet loom according to 7.

The gap (21) is provided between the straightening path (17, 30) of the first straightening member (5) and the straightening path (20) of the second straightening member (6). 9. The weft insertion nozzle of the fluid jet loom according to any one of 1 to 8.

10. The flow control device according to claim 1, wherein the number of flow straightening paths of the second flow straightening member is greater than the number of flow straightening paths of the first flow straightening member. A weft insertion nozzle for the fluid jet loom according to any one of the preceding claims.

The first rectifying member (5) and the second rectifying member (6) are fixed to the nozzle body (2) or the needle (1), and the rectifying members (5, 6) of the nozzle body (2) and the needle (1) are fixed. At least two of the fixed member, the first rectifying member (5), and the second rectifying member (6) are provided with engaging portions (22, 23), respectively, and the engaging portions are located at the center of the water supply hole (13). The center of any one of the rectifying path (17, 30) or the rectifying fin (16) of the first rectifying member (5) and the rectifying path (20) or the rectifying fin (19) of the second rectifying member (6). The weft insertion nozzle for a fluid jet loom according to any one of claims 4, 6, 7, and 8, wherein two or more of the centers are matched.