JP2004182245A

JP2004182245A - Dripproof filling nozzle

Info

Publication number: JP2004182245A
Application number: JP2002348135A
Authority: JP
Inventors: Nobuaki Hase; 宣昭長谷; Tatsuto Kanaike; 達人金池; Shigeru Sakai; 繁坂井
Original assignee: Toyo Seikan Kaisha Ltd
Current assignee: Toyo Seikan Group Holdings Ltd
Priority date: 2002-11-29
Filing date: 2002-11-29
Publication date: 2004-07-02
Anticipated expiration: 2022-11-29
Also published as: JP4453246B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filling nozzle of an effective dripproof fluid filling apparatus. <P>SOLUTION: The filling nozzle comprises a cylindrical holder 10 in which a passage for a filling fluid is formed, and a front end screen 20 which is arranged on the inner periphery of the front end 13 of the holder 10 and has a number of holes to hold the fluid to prevent it from dripping upon stopping filling the fluid. On the inner periphery of the holder 10, a screen engaging part 11 engaging with the screen 20 is formed. The screen 20 comprises an engaging end 21 engaging with the screen engaging part 11, a circular side wall 22 extending downward from the engaging end 21 to fit into the inner peripheral surface 13a of the holder front end, and a screen body 23 covering the lower end of the side wall 22 to allow the filling fluid to pass through the screen body. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、たとえば飲料用液体を容器に充填する液体充填装置に用いられる充填ノズルに関し、特に液だれ防止用のスクリーンを備えた液だれ防止充填ノズルに関する。
【０００２】
【従来の技術】
従来のこの種の液だれ防止充填ノズルとしては、たとえば、特許文献１，特許文献２，特許文献３に記載されるようなものが知られている。
【特許文献１】実公平７−２８１５５号公報
【特許文献２】特開２００１−２０２５号公報
【特許文献３】特開平９−９９９１４号公報
【０００３】
すなわち、充填ノズルには、図５に示すように、整流効果を高め、液だれを防止するためのメッシュ構造のスクリーン１０１（５０〜８０メッシュ程度）がホルダ１０３内に数枚組み込まれ、各スクリーン１０１の多数の目を通過させて充填液の圧力勾配を小さくして整流し、充填ノズル１００の直下に配置されるボトル２００の開口部２０１に充填液１０２を注出するようになっている（図５（Ａ）参照）。充填が完了すると、充填ノズル１００の先端部に位置する先端スクリーン１０１Ａの外面側（容器側）に付着した残留液体は表面張力によって先端スクリーン１０１Ａの目に保持され、液だれの発生を防止するようになっていた。
【０００４】
【発明が解決しようとする課題】
しかしながら、従来の充填ノズルの場合には、充填完了時に先端スクリーン１０１Ａに充填液が保持されるものの、先端スクリーン１０１Ａより下方に位置するホルダ先端部内周面１０３ｂが露出しているので、残留液体が先端スクリーン１０１Ａの下面からホルダ先端部内周面１０３ｂにかけて付着し、接液面積が拡がっている（図５（Ｂ）参照）。
【０００５】
充填スピードが低速の場合には、液滴は下方に位置するボトル２００の開口部２０１の範囲に落下するので問題ないが、６００ＢＰＭ以上の高回転になると、図５（Ｃ）に示すように、ホルダ先端部内周面１０３ｂに付着している自由状態の液滴１０５が、遠心力によってホルダ先端部内周面１０３ｂの一方側に片寄って振り切られるように落下し、ボトル２００の開口部２０１よりも外側に飛散する。
【０００６】
アプセティック充填においては、充填後に加熱殺菌する工程が無いので、特にボトル口部汚れやボトル外への液こぼれを嫌っており、この対策が求められている。
【０００７】
本発明は上記した従来技術の問題点を解決するためになされたもので、その目的とするところは、液だれを効果的に防止し得る液体充填装置の充填ノズルを提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、本発明は、内部が充填液の通路となる筒状のホルダと、該ホルダの先端部内周に配置され充填停止時に多数の孔に液体を保持して液だれを防止する先端スクリーンと、を備え、ホルダ内周には前記先端スクリーンが係合するスクリーン係合部が設けられた液だれ防止充填ノズルにおいて、
前記先端スクリーンは、前記スクリーン係合部に係合する係合端部と、該係合端部から下方に延びてホルダ先端部内周面に嵌合する環状の側壁部と、該側壁部の下端を覆い充填液が透過するスクリーン本体部と、を備えた構成となっていることを特徴とする。
【０００９】
スクリーン本体部は、周辺部よりも中央部が下方に突出する凸形状となっていることを特徴とする。
スクリーン本体部はホルダ先端面とほぼ同じか下方に突出していることを特徴とする。
ホルダ先端部内周面を下方に向かって徐々に小径となる円弧形状とし、環状壁外周をホルダ先端部内周面に対応する円弧形状とすることが好ましい。
ホルダ先端部内周面を下方に向かって徐々に小径となるテーパー形状とし、環状壁外周をホルダ先端部内周面に対応するテーパー形状としてもよい。
【００１０】
また、他の発明は、内部が充填液の通路となる筒状のホルダと、該ホルダの先端部内周に配置され充填停止時に多数の孔に液体を保持して液だれを防止する先端スクリーンと、を備え、ホルダ内周には前記先端スクリーンが係合するスクリーン係合部が設けられた液だれ防止充填ノズルにおいて、
前記先端スクリーンは、前記スクリーン係合部に係合する係合端部と、該係合端部の内側に位置し充填液が透過するスクリーン本体部と、を備え、該スクリーン本体部は、周辺部よりも中央部が下方に突出する形状となっていることを特徴とする。
スクリーン本体部の中央部は、ホルダ先端面とほぼ同じか下方に突出していることが好ましい。
【００１１】
【発明の実施の形態】
以下に本発明を図示の実施の形態に基づいて説明する。
図１は、本発明の実施の形態に係る液だれ防止充填ノズルを示している。
すなわち、この液だれ防止充填ノズル１は、不図示の液体充填装置先端に設けられた保持筒２内に移動自在に装着されるもので、内部が充填液の通路となる筒状のホルダ１０と、このホルダ１０の先端部１３内周に配置され充填停止時に多数の孔に液体を保持して液だれを防止する先端スクリーン２０と、を備え、ホルダ１０内周には先端スクリーン２０が係合するスクリーン係合部１１が設けられている。
【００１２】
ホルダ１０は円筒形状で、その外周中途部には保持筒２内周に摺動自在に嵌合する環状凸部１２が設けられている。ホルダ１０の先端部内周面１３ａは、上流側のホルダ本体内周面１０ａよりも一段小径に絞られており、先端部内周面１３ａとホルダ本体内周面１０ａとの境界の段差がスクリーン係合部１１となっている。
【００１３】
ホルダ本体内周面１０ａには、先端スクリーン２０の上流側に５枚の中間スクリーン３０と、一つの整流板４０が直列に配置されている。整流板４０は下流側３枚の中間スクリーン３０と上流側２枚の中間スクリーン３０の間に挟まれている。各中間スクリーン３０間および中間スクリーン３０と整流板４０との間には、リング状のカラー５０が介装され、所定間隔に保持されている。カラー５０の半径方向の幅は、スクリーン係合部１１の段差の幅とほぼ等しくなっている。
【００１４】
また、最上流に位置する中間スクリーン３０は長尺の押さえカラー５１によって下方に押さえられ、押さえカラー５１の上端がホルダ１０の上端開口部にはめ込まれる押さえリング５２によって固定されている。
中間スクリーン３０および整流板４０の枚数および間隔は、充填液の種類，粘度，流速，圧力等に応じて適宜選択される。図２（Ａ）に示すように、整流板４０を設けないで、中間スクリーン３０としてもよい。場合によっては、中間スクリーン３０は設けないで先端スクリーン２０のみでもよい。
【００１５】
先端スクリーン２０は、図１（Ｃ）に示すように、多数の縦線２０ａと横線２０ｂを交差させたメッシュ部材を断面ハット形状で成形したもので、縦線２０ａと横線２０ｂの間に開口する多数の孔としての目２０ｃに液体を保持するようになっている。
この先端スクリーン２０は、上記したホルダ先端部１３内周のスクリーン係合部１１に係合する係合端部２１と、係合端部２１から下方に延びる環状の側壁部２２と、この側壁部２１の下端を覆い充填液が透過するスクリーン本体部２３と、を備えた構成となっている。
【００１６】
ホルダ先端部内周面１３ａは、下方に向かって徐々に小径となる円弧形状となっており、先端スクリーン２０の側壁部２１外周面もホルダ先端部内周面１３ａに対応する円弧形状となっている。
【００１７】
スクリーン本体部２３は、周辺部よりも中央部が下方に突出する凸形状となっている。この例ではドーム形状に成形されている。スクリーン本体部２３の周縁はホルダ先端面１３ｂとほぼ同じ位置となっており、ドーム状に突出している分だけ、スクリーン本体部２３はホルダ先端面１３ｂより下方に突出している。
スクリーン本体部２３の形状としてはドーム形状に限定されるものではなく、円錐形状としてもよく、要するに周辺部よりも中央部が下方に突出する形状であればよい。
【００１８】
中間スクリーン３０は、図３（Ｂ）に示すような円板形状で、先端スクリーン２０と同様に、多数本の縦線と横線を交差させたメッシュ部材によって構成されている。
先端スクリーン２０および中間スクリーン３０に用いられるメッシュ材は、充填液の種類，粘度、中間スクリーンの枚数、整流板の有無等によって適宜選択される。実験によれば、中間スクリーン３０には＃６０程度のメッシュ材を用い、先端スクリーン２０には＃４０程度のメッシュ材を用いたところ良好な結果を得た。
整流板４０は、図３（Ａ）に示すように、液体の流れを整流する所定長さの複数の流路４１を備えた厚肉の円板形状で、流路４１は円形の貫通穴によって構成されている。
【００１９】
上記構成の液だれ防止充填ノズルにあっては、中間スクリーン３０および整流板４０の流路４１によって効果的に整流され、不図示の容器の開口部に向けて注出される。
充填完了後、充填ノズル１の先端部に位置する先端スクリーン２０のスクリーン本体部２３の下面からホルダ先端部にかけて残留液体が付着するが、図５のようなホルダ先端部内周面１０３ｂの接液部がないので、残留液体は表面張力によってスクリーン本体部２３の目に保持され、充填液の液滴下は生じない。
ホルダ先端部内周面１３ａに先端スクリーン２０の側壁部２２が嵌合しているので、液滴はスクリーン本体部２３だけでなく、ホルダ先端部内周面１３ａと側壁部２２との嵌合隙間に表面張力によって補足され、液だれ防止効果が高くなっている。
特に、ホルダ先端部内周面１３ａが下方に向かって徐々に小径となる円弧形状で、側壁部２２外周面がホルダ先端部内周面１３ａに対応する円弧形状となっているので、側壁部２２とホルダ先端部内周面１３ａ間が軸方向に密着し、嵌合隙間からの液滴の落下をより効果的に阻止することができる。
【００２０】
さらに、スクリーン本体部２３は、周辺部よりも中央部が下方に突出する凸形状となっているので、ホルダ先端部内周面１３ａ側の液滴がスクリーン本体部２３側に引き寄せられるので、ホルダ先端部内周面１３ａ側に付着する液滴が少量となり、液滴の滴下をより確実に防止することができる。また、残留液体はドーム状スクリーンの中央に集まり、万一滴下してもドーム中央から滴下するため、ボトル口部に付着することがない。
【００２１】
他の実施の形態
次に本発明の他の実施の形態について説明する。以下の説明では、上記実施の形態と異なる点についてのみ説明するものとし、同一の構成部分については同一の符号を付して説明を省略する。
図２（Ｂ）は、ホルダ先端部内周面１３ａを、下方に向かって徐々に小径となるテーパー形状とし、側壁部２２外周面をホルダ先端部内周面１３ａに対応するテーパー形状としたものである。このようにテーパ形状とすれば円弧形状に比べて成形が容易となる。
また、図示しないが、ホルダ先端部内周面１３ａは傾斜しないストレートの円筒形状とし、側壁部２２についても対応する円筒形状としてもよい。
【００２２】
図４（Ａ）は、スクリーン本体部２３を平坦面としたものである。
側壁部２２外周面とホルダの先端部内周面１３ａとが嵌合する構成であれば、側壁部２２の外周面と先端部内周面１３ａとの嵌合隙間に液滴が補足され、液だれ防止効果が得られる。
【００２３】
図４（Ｂ）は、先端スクリーン２０に側壁部を設けず、スクリーン係合部１１に係合する係合端部２１と、係合端部２１の内側に位置し充填液が透過するスクリーン本体部２３と、を備えた構成で、スクリーン本体部２３を周辺部よりも中央部が下方に突出する形状としたものである。スクリーン本体部２３は、ドーム形状でも、円錐形状でもよい。
このようにスクリーン本体部２３が下方に突出する構成であれば、充填停止時に液滴がスクリーン本体部２３中央に集まり、表面張力によってホルダ先端部内周面１３ａに付着する液滴がスクリーン本体部２３側に引き寄せられる力が大きくなるので、ホルダ先端部内周面１３ａに付着する液滴が少なくなり、液だれを防止することができる。
なお、付着する液量を少なくするため、ホルダ先端部内周面１３ａの面積はできるだけ小さくすることが好ましく、図４（Ｂ）の例では、結果的にスクリーン本体部２３の中央が、ホルダ先端面１３ｂとほぼ同じか下方に突出するようになっている。
【００２４】
なお、上記各実施の形態では、先端スクリーン２０全体を一枚のメッシュ部材で成形しているが、側壁部２２とスクリーン本体部２３のみをメッシュ部材とし、係合端部２１はカラー５０と同等のリング部材によって構成し、側壁部２２とリング部材を溶接等で接合した構成でもよいし、カラー５０と一体成形してカラー５０を係合端部としてもよい。また、スクリーン本体部２３のみをメッシュ部材とし、係合端部２１と側壁部２２を不図示のつば付き円筒形状のリング部材によって構成し、スクリーン本体部２３をリング部材に溶接するような構成としてもよい。
また、先端スクリーンにメッシュ部材を用いずに、薄板に多数の微細孔を設けた多孔板を用いてもよい。要するに、表面張力によって多数の孔に液体を保持する構成であればよい。
【００２５】
【発明の効果】
以上説明したように、本請求項１に係る発明は、先端スクリーンを、ホルダ内周のスクリーン係合部に係合する係合端部と、係合端部から下方に延びてホルダ先端部内周面に嵌合する環状の側壁部と、側壁部の下端を覆い充填液が透過するスクリーン本体部と、を備えた構成となっているので、ホルダ先端部内周面の接液面積が小さくなると共に、残留液体は先端スクリーンだけでなく側壁部とホルダ先端部内周面との嵌合隙間に表面張力によって補足され、液だれが防止される。
【００２６】
請求項２に係る発明は、スクリーン本体部は、周辺部よりも中央部が下方に突出する凸形状となっているので、充填停止時に液滴が重力によってスクリーン本体部中央部に集まり、ホルダ先端部内周面側の液滴をスクリーン本体部側に引き寄せるので、ホルダ先端部内周面側の液滴が少量となり、液滴の滴下を防止することができる。
請求項３に係る発明は、スクリーン本体部はホルダ先端面とほぼ同じか下方に突出しているので、ホルダ先端部内周面がスクリーンの側壁部によって完全に隠され、ホルダ先端内周面に自由状態で付着する液滴が無くなり、液滴落下をより確実に防止することができる。
【００２７】
請求項４に係る発明は、ホルダ先端部内周面を下方に向かって徐々に小径となる円弧形状とし、側壁部外周をホルダ先端部内周面に対応する円弧形状としたので、側壁部とホルダ先端部内周面間を密着させることができ、隙間からの液滴の落下をより確実に阻止することができる。
【００２８】
請求項５に係る発明は、ホルダ先端部内周面を下方に向かって徐々に小径となるテーパー形状とし、環状壁外周をホルダ先端部内周面に対応するテーパー形状としたので、請求項４と同様に、側壁部とホルダ先端部内周面間を密着させることができ、隙間からの液滴の落下をより確実に阻止することができる。また、円弧形状に比べて成形が簡単である。
【００２９】
請求項６に係る発明は、先端スクリーンを、ホルダ内周のスクリーン係合部に係合する係合端部と、この係合端部の内側に位置し充填液が透過するスクリーン本体部と、を備え、スクリーン本体部を周辺部よりも中央部が下方に突出する形状としたので、充填停止時に液滴が重力によりスクリーン本体部中央に集まり、ホルダ先端部内周面側に付着する液滴をスクリーン本体部側に引き寄せるので、ホルダ先端部内周面側の液滴が少量となり、液表面張力によって液滴が保持されて滴下を防止することができる。
請求項７に係る発明によれば、スクリーン本体部の中央がホルダ先端面とほぼ同じか下方に突出する構成としたので、残留液が付着するホルダ先端部内周面の接液面積を可及的に小さくできる。
【図面の簡単な説明】
【図１】図１（Ａ）は本発明の液だれ防止充填ノズルの縦断面図、同図（Ｂ）は同図（Ａ）の先端スクリーンの斜視図、同図（Ｃ）は先端スクリーンのメッシュの構成を示す拡大模式図である。
【図２】図２（Ａ），（Ｂ）は図１の充填ノズルの他の構成例を示す要部断面図である。
【図３】図３（Ａ）は図１の充填ノズルの整流板の斜視図、同図（Ｂ）は図１の中間スクリーンの斜視図である。
【図４】図４（Ａ），（Ｂ）は本発明の他の実施の形態に係る充填ノズルの要部断面図である。
【図５】図５（Ａ）乃至（Ｃ）は従来の充填ノズルによる充填工程を模式的に示す図である。
【符号の説明】
１液だれ防止充填ノズル
２保持筒
１０ホルダ
１０ａホルダ本体内周面
１１スクリーン係合部
１２環状凸部
１３先端部
１３ａ先端部内周面
１３ｂホルダ先端面
２０先端スクリーン
２１係合端部
２２側壁部
２３スクリーン本体部
３０中間スクリーン
４０整流板[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filling nozzle used in a liquid filling device for filling a liquid for beverage into a container, for example, and more particularly to a filling nozzle for preventing dripping provided with a screen for preventing dripping.
[0002]
[Prior art]
As this type of conventional dripping prevention filling nozzle, for example, those described in Patent Literature 1, Patent Literature 2, and Patent Literature 3 are known.
[Patent Document 1] Japanese Utility Model Publication No. 7-28155 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-2025 [Patent Document 3] Japanese Patent Application Laid-Open No. 9-99914 [0003]
That is, as shown in FIG. 5, several screens 101 (approximately 50 to 80 mesh) having a mesh structure for enhancing a rectifying effect and preventing liquid dripping are incorporated into the holder 103 in the filling nozzle. 101, the pressure gradient of the filling liquid is reduced and rectified by passing through a large number of eyes, and the filling liquid 102 is poured into the opening 201 of the bottle 200 disposed immediately below the filling nozzle 100 ( FIG. 5 (A)). When the filling is completed, the liquid remaining on the outer surface side (container side) of the tip screen 101A located at the tip of the filling nozzle 100 is retained by the surface of the tip screen 101A due to surface tension so as to prevent dripping. Had become.
[0004]
[Problems to be solved by the invention]
However, in the case of the conventional filling nozzle, although the filling liquid is held on the front screen 101A at the time of completion of filling, the residual liquid is retained because the inner peripheral surface 103b of the holder front end located below the front screen 101A is exposed. The liquid adheres from the lower surface of the front screen 101A to the inner peripheral surface 103b of the holder front portion, and the liquid contact area is enlarged (see FIG. 5B).
[0005]
When the filling speed is low, there is no problem because the droplets fall into the area of the opening 201 of the bottle 200 located below, but when the rotation speed is higher than 600 BPM, as shown in FIG. Drops 105 in a free state adhering to the inner peripheral surface 103b of the holder distal end fall down to one side of the inner peripheral surface 103b of the holder distally due to centrifugal force, and fall outside the opening 201 of the bottle 200. Splatters.
[0006]
Since there is no heat sterilization step after filling, there is no particular preference for dirt at the mouth of the bottle or spillage of liquid outside the bottle.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the related art, and an object of the present invention is to provide a filling nozzle of a liquid filling apparatus capable of effectively preventing dripping.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a cylindrical holder having an interior serving as a passage for a filling liquid, and a liquid drip which is arranged on an inner periphery of a tip portion of the holder and holds liquid in a number of holes when filling is stopped. A tip screen to prevent the dripping prevention filling nozzle provided with a screen engaging portion on the inner periphery of the holder, the tip screen is engaged,
The tip screen has an engagement end portion that engages with the screen engagement portion, an annular side wall portion that extends downward from the engagement end portion and fits on the inner peripheral surface of the holder front end portion, and a lower end of the side wall portion. And a screen main body through which the filling liquid is transmitted.
[0009]
The screen body has a convex shape in which a central portion protrudes downward from a peripheral portion.
The screen main body part is substantially the same as or protrudes downward from the tip surface of the holder.
It is preferable that the inner peripheral surface of the holder distal end portion has an arc shape gradually decreasing in diameter downward, and the outer periphery of the annular wall has an arc shape corresponding to the inner peripheral surface of the holder distal end portion.
The inner peripheral surface of the holder distal end portion may have a tapered shape gradually decreasing in diameter downward, and the outer periphery of the annular wall may have a tapered shape corresponding to the inner peripheral surface of the holder distal end portion.
[0010]
Further, another invention is a cylindrical holder in which a filling liquid passage is provided, and a tip screen which is disposed on the inner periphery of the tip portion of the holder and holds liquid in a number of holes when filling is stopped to prevent dripping. A drip prevention filling nozzle provided with a screen engaging portion on the inner periphery of the holder, with which the tip screen engages.
The tip screen includes an engagement end portion that engages with the screen engagement portion, and a screen main body portion that is located inside the engagement end portion and through which the filling liquid permeates. The central part has a shape protruding downward from the part.
It is preferable that the central portion of the screen main body projects substantially the same as or below the holder tip surface.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiments.
FIG. 1 shows a filling nozzle for preventing dripping according to an embodiment of the present invention.
That is, the filling nozzle 1 for preventing liquid dripping is movably mounted in a holding cylinder 2 provided at the tip of a liquid filling device (not shown), and has a cylindrical holder 10 in which a filling liquid passage is provided. A tip screen 20 which is disposed on the inner periphery of the tip portion 13 of the holder 10 and holds the liquid in a number of holes to prevent dripping when filling is stopped, and the tip screen 20 is engaged with the inner periphery of the holder 10. A screen engaging portion 11 is provided.
[0012]
The holder 10 has a cylindrical shape, and is provided with an annular convex portion 12 which is slidably fitted on the inner periphery of the holding cylinder 2 in the middle of the outer periphery. The inner peripheral surface 13a of the distal end portion of the holder 10 is narrowed down by one step from the inner peripheral surface 10a of the holder main body on the upstream side. The section 11.
[0013]
On the inner peripheral surface 10a of the holder main body, five intermediate screens 30 and one rectifying plate 40 are arranged in series upstream of the front end screen 20. The current plate 40 is sandwiched between three intermediate screens 30 on the downstream side and two intermediate screens 30 on the upstream side. A ring-shaped collar 50 is interposed between the intermediate screens 30 and between the intermediate screen 30 and the current plate 40, and is held at predetermined intervals. The width of the collar 50 in the radial direction is substantially equal to the width of the step of the screen engaging portion 11.
[0014]
Further, the intermediate screen 30 located at the uppermost stream is pressed downward by a long holding collar 51, and the upper end of the holding collar 51 is fixed by a holding ring 52 fitted into the upper end opening of the holder 10.
The number and interval of the intermediate screen 30 and the flow regulating plate 40 are appropriately selected according to the type, viscosity, flow velocity, pressure, and the like of the filling liquid. As shown in FIG. 2A, the intermediate screen 30 may be used without providing the current plate 40. In some cases, only the front screen 20 may be provided without providing the intermediate screen 30.
[0015]
As shown in FIG. 1 (C), the front end screen 20 is formed by shaping a mesh member in which a number of vertical lines 20a and horizontal lines 20b intersect with a hat-shaped cross section, and is opened between the vertical lines 20a and the horizontal lines 20b. The liquid is retained in the eye 20c as a number of holes.
The distal end screen 20 includes an engaging end 21 that engages with the screen engaging portion 11 on the inner periphery of the holder distal end 13, an annular side wall 22 extending downward from the engaging end 21, And a screen main body 23 that covers the lower end of 21 and through which the filling liquid permeates.
[0016]
The inner peripheral surface 13a of the holder distal end portion has an arc shape gradually decreasing in diameter downward, and the outer peripheral surface of the side wall portion 21 of the distal end screen 20 also has an arc shape corresponding to the inner peripheral surface 13a of the holder distal end portion.
[0017]
The screen main body 23 has a convex shape in which a central portion protrudes downward from a peripheral portion. In this example, it is formed in a dome shape. The peripheral edge of the screen main body 23 is substantially at the same position as the holder front end face 13b, and the screen main body 23 protrudes downward from the holder front end face 13b by an amount corresponding to the dome-shaped projection.
The shape of the screen main body 23 is not limited to the dome shape, but may be a conical shape, that is, any shape as long as the central portion protrudes downward from the peripheral portion.
[0018]
The intermediate screen 30 has a disk shape as shown in FIG. 3B and is made of a mesh member in which a number of vertical lines and horizontal lines intersect, like the front screen 20.
The mesh material used for the front screen 20 and the intermediate screen 30 is appropriately selected depending on the kind of the filling liquid, the viscosity, the number of the intermediate screens, the presence or absence of the rectifying plate, and the like. According to the experiment, when the mesh material of about # 60 was used for the intermediate screen 30 and the mesh material of about # 40 was used for the front screen 20, good results were obtained.
As shown in FIG. 3A, the current plate 40 is a thick disk having a plurality of flow paths 41 of a predetermined length for rectifying the flow of the liquid, and the flow path 41 is formed by a circular through hole. It is configured.
[0019]
In the filling nozzle for preventing dripping having the above configuration, the liquid is effectively rectified by the intermediate screen 30 and the flow path 41 of the rectifying plate 40, and is discharged toward the opening of the container (not shown).
After the filling is completed, the residual liquid adheres from the lower surface of the screen main body 23 of the tip screen 20 located at the tip of the filling nozzle 1 to the tip of the holder, but the liquid contact portion of the inner peripheral surface 103b of the holder tip as shown in FIG. Since there is no remaining liquid, the residual liquid is held in the eyes of the screen main body 23 by the surface tension, and no drop of the filling liquid occurs.
Since the side wall portion 22 of the front end screen 20 is fitted to the inner peripheral surface 13a of the holder front end portion, the liquid droplets are not only placed on the screen main body portion 23 but also in the fitting gap between the inner peripheral surface 13a of the holder front end portion and the side wall portion 22. Supplemented by the tension, the dripping prevention effect is high.
In particular, since the inner peripheral surface 13a of the holder distal end portion has an arc shape in which the diameter gradually decreases downward, and the outer peripheral surface of the side wall portion 22 has an arc shape corresponding to the inner peripheral surface 13a of the holder distal end portion, the side wall portion 22 and the holder The gaps between the inner peripheral surfaces 13a of the distal end portions are closely contacted in the axial direction, and the drop of the liquid droplets from the fitting gap can be more effectively prevented.
[0020]
Further, since the screen main body 23 has a convex shape in which the central portion protrudes downward from the peripheral portion, the liquid droplets on the inner peripheral surface 13a side of the holder front end portion are drawn to the screen main body portion 23 side. The amount of droplets adhering to the inner peripheral surface 13a side becomes small, and the dripping of the droplets can be more reliably prevented. Further, the residual liquid collects at the center of the dome-shaped screen, and even if it is dropped, it drops from the center of the dome, so that it does not adhere to the mouth of the bottle.
[0021]
Another Embodiment Next, another embodiment of the present invention will be described. In the following description, only differences from the above-described embodiment will be described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.
In FIG. 2B, the inner peripheral surface 13a of the holder distal end portion has a tapered shape whose diameter gradually decreases downward, and the outer peripheral surface of the side wall portion 22 has a tapered shape corresponding to the inner peripheral surface 13a of the holder distal end portion. . Such a tapered shape facilitates molding as compared to an arc shape.
Although not shown, the inner peripheral surface 13a of the holder distal end portion may have a straight cylindrical shape without inclination, and the side wall portion 22 may have a corresponding cylindrical shape.
[0022]
FIG. 4A shows a screen main body 23 having a flat surface.
If the outer peripheral surface of the side wall portion 22 and the inner peripheral surface 13a of the distal end portion of the holder are fitted to each other, droplets are captured in the fitting gap between the outer peripheral surface of the side wall portion 22 and the inner peripheral surface 13a of the distal end portion to prevent dripping. The effect is obtained.
[0023]
FIG. 4B shows an engagement end portion 21 that engages with the screen engagement portion 11 without providing a side wall portion on the front end screen 20, and a screen body that is located inside the engagement end portion 21 and through which the filling liquid permeates. And a screen 23. The screen main body 23 has a shape in which a central portion protrudes downward from a peripheral portion. The screen body 23 may have a dome shape or a conical shape.
If the screen main body 23 protrudes downward as described above, droplets collect at the center of the screen main body 23 when filling is stopped, and droplets adhering to the holder inner peripheral surface 13a due to surface tension are reduced. Since the force attracted to the side increases, the amount of liquid droplets adhering to the inner peripheral surface 13a of the holder distal end portion decreases, and dripping can be prevented.
It is preferable that the area of the inner peripheral surface 13a of the holder tip is reduced as much as possible in order to reduce the amount of liquid adhering. In the example of FIG. 13b so as to protrude substantially the same or downward.
[0024]
In the above embodiments, the entire tip screen 20 is formed of a single mesh member. However, only the side wall 22 and the screen main body 23 are formed of a mesh member, and the engagement end 21 is equivalent to the collar 50. And the side wall portion 22 and the ring member may be joined by welding or the like, or may be integrally formed with the collar 50 to make the collar 50 an engagement end. Further, only the screen main body 23 is formed of a mesh member, the engagement end 21 and the side wall 22 are formed of a cylindrical ring member with a flange (not shown), and the screen main body 23 is welded to the ring member. Is also good.
Instead of using a mesh member for the front end screen, a perforated plate having a large number of fine holes formed in a thin plate may be used. In short, any configuration may be used as long as the liquid can be held in many holes by surface tension.
[0025]
【The invention's effect】
As described above, according to the first aspect of the present invention, the distal end screen is provided with an engaging end portion that engages with the screen engaging portion on the inner periphery of the holder, and an inner peripheral portion extending downward from the engaging end portion. Since it has an annular side wall portion fitted to the surface and a screen body portion covering the lower end of the side wall portion and allowing the filling liquid to pass through, the liquid contact area of the inner peripheral surface of the tip end portion of the holder is reduced, and The residual liquid is trapped by the surface tension in the fitting gap between the side wall portion and the inner peripheral surface of the holder distal end as well as the distal end screen, thereby preventing dripping.
[0026]
In the invention according to claim 2, since the screen main body has a convex shape in which the central portion protrudes downward from the peripheral portion, the droplets gather at the central portion of the screen main body due to gravity when filling stops, and Since the liquid droplets on the inner peripheral surface side are drawn toward the screen main body, the amount of liquid droplets on the inner peripheral surface side of the holder distal end portion becomes small, and the dripping of the liquid droplets can be prevented.
According to the third aspect of the invention, since the screen main body is substantially the same as or protrudes downward from the holder distal end surface, the inner peripheral surface of the holder distal end is completely hidden by the side wall of the screen, and the inner peripheral surface of the holder distal end is free. In this case, the liquid droplets adhered to each other are eliminated, and the liquid droplets can be more reliably prevented from falling.
[0027]
In the invention according to claim 4, the inner peripheral surface of the holder distal end portion has an arc shape gradually decreasing in diameter downward, and the outer peripheral portion of the side wall portion has an arc shape corresponding to the inner peripheral surface of the holder distal end portion. The inner peripheral surfaces can be brought into close contact with each other, and the drop of the liquid droplet from the gap can be more reliably prevented.
[0028]
The invention according to claim 5 is the same as claim 4, since the inner peripheral surface of the holder distal end portion has a tapered shape gradually decreasing in diameter downward, and the outer periphery of the annular wall has a tapered shape corresponding to the inner peripheral surface of the holder distal end portion. In addition, the side wall portion and the inner peripheral surface of the holder distal end portion can be brought into close contact with each other, so that the drop of the droplet from the gap can be more reliably prevented. Further, the molding is easier than the arc shape.
[0029]
The invention according to claim 6 is characterized in that the front end screen is engaged with a screen engaging portion on the inner periphery of the holder, a screen main body portion located inside the engaging end portion and through which the filling liquid is transmitted, Since the screen body has a shape in which the center part protrudes downward from the peripheral part, droplets gather at the center of the screen body due to gravity when filling stops, and the droplets adhering to the inner peripheral surface side of the holder tip part Since the liquid crystal is drawn toward the screen main body, the amount of the liquid droplet on the inner peripheral surface side of the tip end portion of the holder becomes small, the liquid droplet is held by the liquid surface tension, and the liquid droplet can be prevented from dripping.
According to the seventh aspect of the invention, since the center of the screen main body is configured to be substantially the same as or lower than the holder front end surface, the liquid contact area of the inner peripheral surface of the holder front end to which the residual liquid adheres is as small as possible. Can be made smaller.
[Brief explanation of drawings]
1 (A) is a longitudinal sectional view of a filling nozzle for preventing liquid dripping according to the present invention, FIG. 1 (B) is a perspective view of the tip screen of FIG. 1 (A), and FIG. It is an expansion schematic diagram which shows the structure of a mesh.
FIGS. 2A and 2B are cross-sectional views of main parts showing another configuration example of the filling nozzle of FIG.
3 (A) is a perspective view of a flow straightening plate of the filling nozzle of FIG. 1, and FIG. 3 (B) is a perspective view of an intermediate screen of FIG. 1;
FIGS. 4A and 4B are cross-sectional views of main parts of a filling nozzle according to another embodiment of the present invention.
FIGS. 5A to 5C are diagrams schematically showing a filling step using a conventional filling nozzle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drip prevention filling nozzle 2 Holding cylinder 10 Holder 10a Holder main body inner peripheral surface 11 Screen engaging portion 12 Annular convex portion 13 Tip portion 13a Tip end inner peripheral surface 13b Holder tip surface 20 Tip screen 21 Engaging end portion 22 Side wall portion 23 Screen body 30 Intermediate screen 40 Rectifier plate

Claims

A cylindrical holder having an interior serving as a passage for the filling liquid, and a tip screen arranged on the inner periphery of the tip of the holder to hold the liquid in a number of holes when filling is stopped to prevent dripping, and In the dripping prevention filling nozzle provided with a screen engagement portion with which the tip screen is engaged,
The tip screen has an engagement end portion that engages with the screen engagement portion, an annular side wall portion that extends downward from the engagement end portion and fits on the inner peripheral surface of the holder front end portion, and a lower end of the side wall portion. A dripping-prevention filling nozzle, comprising: a screen main body portion that covers the cover and allows a filling liquid to pass therethrough.

The filling nozzle according to claim 1, wherein the screen main body has a convex shape in which a central portion protrudes downward from a peripheral portion.

3. The filling nozzle for preventing liquid dripping according to claim 1, wherein the screen body protrudes substantially the same as or downward from the front end surface of the holder.

The liquid dripping device according to any one of claims 1 to 3, wherein the inner peripheral surface of the holder distal end portion has an arc shape gradually decreasing in diameter downward, and the outer periphery of the annular wall has an arc shape corresponding to the inner peripheral surface of the holder distal end portion. Prevent filling nozzle.

The inner peripheral surface of the holder tip portion is tapered so that the diameter gradually decreases downward, and the outer periphery of the annular wall has a tapered shape corresponding to the inner peripheral surface of the holder tip portion. 4. A filling nozzle for preventing dripping according to 4.

A cylindrical holder having an interior serving as a passage for the filling liquid, and a tip screen arranged on the inner periphery of the tip of the holder to hold the liquid in a number of holes when filling is stopped to prevent dripping, and In the dripping prevention filling nozzle provided with a screen engagement portion with which the tip screen is engaged,
The tip screen includes an engagement end portion that engages with the screen engagement portion, and a screen main body portion that is located inside the engagement end portion and through which the filling liquid permeates,
A dripping prevention filling nozzle characterized in that the screen main body has a shape in which a central portion protrudes downward from a peripheral portion.

7. The filling dripping prevention nozzle according to claim 6, wherein a central portion of the screen main body portion is substantially the same as or protrudes downward from the holder front end surface.