JP3770432B2

JP3770432B2 - Liquid ejector suction pipe

Info

Publication number: JP3770432B2
Application number: JP18775097A
Authority: JP
Inventors: 利一小川
Original assignee: Yoshino Kogyosho Co Ltd
Current assignee: Yoshino Kogyosho Co Ltd
Priority date: 1997-06-27
Filing date: 1997-06-27
Publication date: 2006-04-26
Anticipated expiration: 2017-06-27
Also published as: JPH1119545A

Description

【０００１】
【発明の属する技術分野】
本発明は液体噴出器の吸い上げパイプに関する。
【０００２】
【従来の技術】
液体噴出器に於ける吸い上げパイプとして、容器体に嵌着した液体噴出ポンプ下端の吸引口に上端を嵌着させるとともに、下端を容器体内へ垂下させて装着したものが知られている。これらは、ポンプの操作により容器体内の液をその下端開口より吸い上げてポンプ内へ供給する如く構成したものであり、一般に合成樹脂により形成された縦長円筒状をなしている。
【０００３】
【発明が解決しようとする課題】
従来の吸い上げパイプを装着した噴出器は、吸い上げパイプの下端を容器体内下端部まで垂下させているため、噴出器を倒立させた際に、容器体上部に存在する空気がパイプの下端開口部分に移行し、その結果パイプの下端開口からポンプへの液の供給が行えず、従って、倒立状態での液の噴出は殆ど困難であった。
【０００４】
そこで本発明は上記した点に鑑み、装着した噴出器を倒立させた際に、容器体内の液をポンプに供給することができ、従って、倒立状態でも液の噴出を可能ならしめる吸い上げパイプを提案するものである。
【０００５】
【課題を解決するための手段】
第１の手段として、容器体Ａに密嵌した液体噴出ポンプＢ下端の吸引口ａに上端を嵌着させるとともに、剛性を有する上下端開口の筒状をなす筒部材２と、筒部材の下端部に上端部を密嵌させた縦長筒状をなすとともに、下端を容器体内下部に垂下させるパイプ本体３と、筒部材２の筒壁下部に穿設した透孔ｂを閉塞して筒壁外周に所定幅の上下動が可能に嵌着させるとともに、倒立時に自重で移行して透孔ｂを開口する環状体４とを備えてなる。
【０００６】
第２の手段として、上記第１の手段に於いて、上記環状体４が、筒部材２の筒壁外周に先端縁を各々嵌合させたテーパ筒状の摺動部６，６を内周上下縁より突設した筒状基板７と、該基板外周に嵌着固定した筒状の重り８とからなる環状体とした。
【０００７】
【発明の実施の形態】
以下、本発明の実施例の形態を図面を参照して説明する。
図面に示す如く、本発明の液体噴出器の吸い上げパイプ１は、筒部材２と、パイプ本体３と、環状体４とを備えている。
【０００８】
筒部材２は、合成樹脂等により形成したもので、容器体Ａに嵌着した液体噴出ポンプＢ下端の吸引口ａに上端を密嵌させる如く構成して、パイプ本体３をポンプＢに連結するジョイントの役割を果たすとともに、環状体４の安定した上下動を案内する役割を果たし、剛性を有する上下端開口の筒状をなしている。また、その筒壁下部には、倒立時に容器体内の液を導入させるための内外を連通する透孔ｂを穿設している。
【０００９】
図面に示す実施例では、円筒状の筒壁の外周下部より外方へ、環状体４を係止するためのフランジ５を突設し、該フランジ下方の筒壁をパイプ本体３の肉厚程度大径に形成して、この部分にパイプ本体３上端を密嵌させる如く構成するとともに、フランジ５上部の筒壁に透孔ｂを穿設している。
【００１０】
パイプ本体３は、合成樹脂等により形成された縦長筒状をなし、その上端部を筒部材２の下端開口部に密嵌させている。
【００１１】
環状体４は、上記透孔ｂを閉塞して筒部材２の筒壁外周に所定幅の上下動が可能に嵌着させるとともに、倒立時に自重で移行して透孔ｂを開口する如く構成している。
【００１２】
環状体４の形態として、例えば、図１に示す実施例の如き筒状のもの、或いは、図３に示す如く、筒部材２の筒壁外周に先端縁を密嵌させたテーパ筒状の摺動部６，６を内周上下縁より突設した筒状基板７と、該基板外周に嵌着固定した筒状の重り８とからなるもの等が採用できる。
【００１３】
また、この環状体４を、パイプを倒立させることにより、その自重で移行させるためには、当然収納液の比重より重い材質で形成する必要があり、従って、一般にこの種の噴出器に使用している、比重の其ほど大きくない合成樹脂単独で形成したものでは不都合な場合がある。従って、この環状体を形成する材質としては、バリウム等の金属単独，或いは金属粉練込樹脂，或いはタルク，硝子等の無機質を練り込んだ無機質練込樹脂，或いは例えば比重が２以上あるような高比重樹脂等を採用することができ、収納する液の比重，粘度等により、その形態，重さ等を適宜選択すると良い。尚、上記各練込樹脂のベースとなる樹脂は一般にこの種の噴出器を形成する際に使用する樹脂等を使用できる。
【００１４】
図１に示す実施例の筒状をなすものの場合には、自重での円滑な上下動を行わせるためには、筒部材２の筒壁外面と、環状体４内面との間に僅かに隙間をあけておくと良い。この場合、透孔ｂを環状体４が閉塞していても、その隙間を介しての液の漏出等の問題が考えられるが、僅かな隙間ではその様な不都合を生じる虞は極めて少なく、特に、比較的粘度の高い液を収納したものに適用すればより不都合は防止される。
【００１５】
図３に示す実施例の場合には、重り８の存在で、摺動部６の上下端縁を筒部材２の筒壁外周に液密に当接させてシールさせても、自重での円滑な上下動を行える。上下摺動部を突設した筒状基板７の材質は、エラストマー等の柔軟で弾力性に富む材質が好ましく採用でき、また、重り８は、上記円筒状の環状体４を形成する材質と同様の材質を採用することができる。
【００１６】
また、上記各実施例に於ける環状体４は、フランジ５上面と、ポンプの吸引口ａ周縁部下面との間を上下動可能に装着されている。
【００１７】
上記した如き吸い上げパイプ１は、噴出器が正立状態では、その環状体４が透孔ｂを閉塞して、従来の筒状パイプ同様に下端開口より液を吸い上げ、上端よりポンプ内に液を供給する。また、噴出器を倒立させた際には、自重で環状体４が下方（ポンプ側）に移行して透孔ｂが開口するため、パイプ本体３の先端が容器体内の底板側に移行した空気の中に突設した状態となっても、透孔ｂから液が筒部材２内を通り、ポンプに供給される。
【００１８】
以下、図面に示す実施例のその他の部分を詳細に説明する。
図面の実施例に於けるポンプＢは、容器体Ａの口頚部９外周に嵌合させた周壁上端縁よりフランジ状の頂板を延設した装着キャップ10と、頂板下面と容器体口頚部上面との間に挟持させたフランジ11を外周に突設した大径筒部12の頂板を貫通して上方へ小径筒部13を起立させるとともに、小径筒部13の下端開口部を上記吸引口ａとして構成した連結部材14と、大径筒部12外周上部に密嵌させた嵌合筒15の頂板を介して小径筒部13外周に密嵌させた縦筒16を立設するとともに、縦筒16上部から射出筒17を、その下部からシリンダ18をそれぞれ前方へ突設してなるポンプ本体19と、射出筒17前部から揺動可能に垂設させたトリガー20と、射出筒17先端に連結部材21を介して突設したノズルヘッド22とを備え、トリガー操作による内蔵ポンプ機構の作用で、容器体内の液を吸い上げてノズルヘッド22先端の噴出口ｃより噴出する如く構成している。
【００１９】
また、上記ポンプ機構は、シリンダ18内にコイルスプリング23により前方付勢させたプランジャ24を押し込み可能に設けるとともに、プランジャ24前部をトリガー20上部に連携させ、また、小径筒部13及び縦筒16を貫通して穿設した連通孔ｄを介して小径筒部13内とシリンダ18内を連通するとともに、小径筒部13及び縦筒16を貫通して穿設した連通孔ｃを介して小径筒部13内と射出筒17を連通させて吸い上げパイプ１より射出筒17に至る液流路を形成し、液流路に於けるシリンダの上流には吸い込み弁25を、その下流には吐出弁26をそれぞれ設けた公知機構のものである。また、本実施例では、シリンダ内面後部に一端を開口し、他端を容器体口頚部内に開口した外気導入路を設けており、この外気導入路に公知の逆止弁を設けて、噴出器倒立状態では外気導入路を遮断し、正立状態では、負圧化した容器体内へ逆止弁を開いて外気が導入する如く構成している。
【００２０】
次いで、本発明吸い上げパイプ１を装着した上記噴出器を使用する場合に付いて説明する。噴出器の正立状態では、トリガー20の引き込み操作によりプランジャ24が押し込まれ、それによって加圧されたシリンダ18内の液が吐出弁26を開き、ノズルヘッド22の噴出口ｃより噴出し、また、プランジャ24の前方移行の際にはシリンダ18内の負圧化により吐出弁26が閉じ、吸い込み弁25が開いて容器体内の液が吸い上げパイプ１のパイプ本体３下端開口より吸い上げられてシリンダ18内に導入される。
【００２１】
また、噴出器を倒立させると、自重で環状体４がポンプＢ側へ移行して透孔ｂが開き、トリガー20を引き込むと同様に噴出口ｃより液が噴出するとともに、プランジャ24の前方移行の際には容器体内の液が透孔ｂを介してシリンダ18内に導入される。
【００２２】
尚、上記各実施例では、容器体にトリガー式のポンプを装着した液体噴出器の例について説明したが、本発明の吸い上げパイプは、押し下げヘッド式の縦型ポンプを容器体に装着した液体噴出器に利用することも当然可能である。
【００２３】
【発明の効果】
以上説明した如く本発明液体噴出器の吸い上げパイプは、容器体に嵌着した液体噴出ポンプＢ下端の吸引口ａに上端を密嵌させるとともに、剛性を有する上下端開口の筒状をなす筒部材２と、筒部材の下端部に上端部を密嵌させた縦長筒状をなすとともに、下端を容器体内下部に垂下させるパイプ本体３と、筒部材２の筒壁下部に穿設した透孔ｂを閉塞して筒壁外周に所定幅の上下動が可能に嵌着させるとともに、倒立時に自重で移行して透孔ｂを開口する環状体４とを備えているので、装着した噴出器を倒立或いは正立させるだけで、筒部材２に案内されて環状体４は確実に上下動を行い、容器体内の液の導入口を自動的に変更して、正立，倒立のどの状態でも円滑な液の噴出を行えるものであり、しかも、既成のポンプの吸引口に嵌着固定するだけで良いため、従来の吸い上げパイプと取り扱い上何ら変わらない。
【００２４】
また、その構造は簡単であるため、製造も容易に行え、安価に製造できる利点も兼ね備えている。
【００２５】
また、筒部材２の筒壁外周に先端縁を各々嵌合させたテーパ筒状の摺動部６，６を内周上下縁より突設した筒状基板７と、該基板外周に嵌着固定した筒状の重り８とからなる環状体を設けたものにあっては、良好な密閉性及び摺動性と、上下動に必要な充分な重さを兼ね備えることが出来るため、それらを適宜選択することにより、液の種類等に左右されずに適用できる利点を兼ね備えている。
【図面の簡単な説明】
【図１】本発明吸い上げパイプの一実施例を示す要部縦断面図である。
【図２】同実施例に於ける倒立状態の要部拡大断面図である。
【図３】本発明の他の実施例を示す要部縦断面図である。
【図４】同実施例に於ける倒立状態の要部拡大断面図である。
【符号の説明】
２…筒部材，３…パイプ本体，４…環状体，６…摺動部，７…筒状基板，
８…重り，Ａ…容器体，Ｂ…液体噴出ポンプ，ａ…吸引口，ｂ…透孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suction pipe of a liquid ejector.
[0002]
[Prior art]
As a suction pipe in a liquid ejector, there is known a suction pipe in which an upper end is fitted to a suction port at a lower end of a liquid ejection pump fitted to a container body and the lower end is suspended in the container body. These are configured such that the liquid in the container is sucked from the lower end opening and supplied into the pump by the operation of the pump, and generally has a vertically long cylindrical shape formed of a synthetic resin.
[0003]
[Problems to be solved by the invention]
The conventional blower equipped with the suction pipe has the lower end of the suction pipe hanging down to the lower end of the container body, so when the blower is turned upside down, the air present at the upper part of the container body enters the lower end opening of the pipe. As a result, the liquid could not be supplied to the pump from the lower end opening of the pipe, and therefore it was almost difficult to eject the liquid in the inverted state.
[0004]
Therefore, in view of the above points, the present invention proposes a suction pipe that can supply the liquid in the container body to the pump when the mounted ejector is inverted, and thus enables the liquid to be ejected even in the inverted state. To do.
[0005]
[Means for Solving the Problems]
As a first means , the upper end is fitted to the suction port a at the lower end of the liquid jet pump B tightly fitted to the container body A, and the cylindrical member 2 having a cylindrical shape with upper and lower ends having rigidity, and the lower end of the cylindrical member The tube body 3 is formed in a vertically long cylinder shape with the upper end part closely fitted to the part, and the pipe body 3 that hangs the lower end to the lower part of the container body and the through hole b formed in the lower part of the cylindrical wall of the cylindrical member 2 are closed. in conjunction with vertically moving it can be fitted with a predetermined width, ing an annular body 4 to open the through hole b shifts by its own weight when inverted.
[0006]
As a second means, in the first means, the annular body 4 has tapered cylindrical sliding portions 6 and 6 each having a tip edge fitted to the outer periphery of the cylindrical wall of the cylindrical member 2. An annular body composed of a cylindrical substrate 7 protruding from the upper and lower edges and a cylindrical weight 8 fitted and fixed to the outer periphery of the substrate was formed .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in the drawings, the suction pipe 1 of the liquid ejector of the present invention includes a cylindrical member 2, a pipe body 3, and an annular body 4.
[0008]
The cylindrical member 2 is formed of synthetic resin or the like, and is configured so that the upper end is closely fitted to the suction port a at the lower end of the liquid jet pump B fitted to the container body A, and the pipe body 3 is connected to the pump B. While playing the role of a joint, it plays the role which guides the stable vertical movement of the annular body 4, and has comprised the cylindrical shape of the upper-lower-end opening which has rigidity. In addition, a through hole b is formed in the lower part of the cylindrical wall to communicate the inside and outside for introducing the liquid in the container body when inverted.
[0009]
In the embodiment shown in the drawings, a flange 5 for locking the annular body 4 is projected outwardly from the lower outer periphery of the cylindrical tube wall, and the tube wall below the flange is formed about the thickness of the pipe body 3. The pipe body 3 is formed in a large diameter so that the upper end of the pipe body 3 is closely fitted to this portion, and a through hole b is formed in the cylindrical wall above the flange 5.
[0010]
The pipe body 3 has a vertically long cylindrical shape formed of synthetic resin or the like, and its upper end is closely fitted to the lower end opening of the cylindrical member 2.
[0011]
The annular body 4 is configured so as to close the through hole b and fit the cylinder member 2 on the outer periphery of the cylinder wall so that the cylinder member 2 can move up and down with a predetermined width. ing.
[0012]
As the form of the annular body 4, for example, a cylindrical one as in the embodiment shown in FIG. 1, or as shown in FIG. 3, a tapered cylindrical slide having a tip edge closely fitted to the outer periphery of the cylindrical wall of the cylindrical member 2. For example, a cylindrical substrate 7 in which the moving parts 6 and 6 protrude from the inner peripheral upper and lower edges and a cylindrical weight 8 fitted and fixed to the outer periphery of the substrate can be adopted.
[0013]
Further, in order to shift the annular body 4 by its own weight by inverting the pipe, it is naturally necessary to form it with a material heavier than the specific gravity of the stored liquid. Therefore, it is generally used for this type of ejector. However, it may be inconvenient if it is formed of a synthetic resin that is not so large in specific gravity. Accordingly, the material forming this annular body may be a metal such as barium alone, a metal powder kneaded resin, an inorganic kneaded resin kneaded with an inorganic material such as talc or glass, or a specific gravity of 2 or more, for example. A high specific gravity resin or the like can be employed, and the form, weight, and the like may be appropriately selected depending on the specific gravity, viscosity, and the like of the liquid to be stored. The resin used as the base of each kneaded resin can generally be a resin used when this type of ejector is formed.
[0014]
In the case of the cylindrical shape of the embodiment shown in FIG. 1, a slight gap is formed between the outer surface of the cylindrical wall of the cylindrical member 2 and the inner surface of the annular body 4 in order to perform smooth vertical movement under its own weight. It is good to leave a gap. In this case, even if the annular body 4 closes the through-hole b, there may be a problem such as leakage of liquid through the gap. If applied to a liquid containing a relatively high viscosity liquid, inconvenience can be prevented.
[0015]
In the case of the embodiment shown in FIG. 3, even if the weight 8 is present, the upper and lower edges of the sliding portion 6 are sealed in liquid-tight contact with the outer periphery of the cylindrical wall of the cylindrical member 2, so Can move vertically. The material of the cylindrical substrate 7 provided with the upper and lower sliding portions is preferably a flexible and elastic material such as an elastomer, and the weight 8 is the same as the material forming the cylindrical annular body 4. The material can be adopted.
[0016]
The annular body 4 in each of the above embodiments is mounted so as to be movable up and down between the upper surface of the flange 5 and the lower surface of the peripheral edge of the suction port a of the pump.
[0017]
In the suction pipe 1 as described above, when the ejector is in an upright state, the annular body 4 closes the through hole b, sucks the liquid from the lower end opening like the conventional cylindrical pipe, and draws the liquid into the pump from the upper end. Supply. Further, when the ejector is turned upside down, the annular body 4 moves downward (pump side) by its own weight and the through hole b opens, so that the tip of the pipe body 3 is moved to the bottom plate side in the container body. Even if it is in a state of projecting into the liquid, the liquid passes through the cylindrical member 2 from the through hole b and is supplied to the pump.
[0018]
Hereinafter, other parts of the embodiment shown in the drawings will be described in detail.
The pump B in the embodiment of the drawing includes a mounting cap 10 having a flange-like top plate extending from the upper edge of the peripheral wall fitted to the outer periphery of the neck portion 9 of the container body A, a bottom surface of the top plate, an upper surface of the neck portion of the container body. The small diameter cylindrical portion 13 is erected upward through the top plate of the large diameter cylindrical portion 12 projecting on the outer periphery of the flange 11 sandwiched between the lower end opening portion of the small diameter cylindrical portion 13 as the suction port a. While the connecting member 14 configured and the vertical cylinder 16 tightly fitted to the outer periphery of the small-diameter cylindrical portion 13 through the top plate of the fitting cylinder 15 tightly fitted to the upper periphery of the large-diameter cylindrical portion 12, the vertical cylinder 16 Connected to the injection cylinder 17 from the top and the pump body 19 with the cylinder 18 projecting forward from the bottom, the trigger 20 suspended from the front of the injection cylinder 17 and the tip of the injection cylinder 17 And a nozzle head 22 projecting through a member 21, and the container is operated by a built-in pump mechanism by a trigger operation. Are composed as ejected from the ejection port c of the nozzle head 22 tip sucks up liquid in the.
[0019]
Further, the pump mechanism is provided so that the plunger 24 urged forward by the coil spring 23 can be pushed into the cylinder 18 and the front portion of the plunger 24 is linked to the upper portion of the trigger 20, and the small diameter cylindrical portion 13 and the vertical cylinder The small-diameter cylindrical portion 13 and the cylinder 18 are communicated with each other through a communication hole d formed through the through-hole 16 and the small-diameter through a communication hole c formed through the small-diameter cylindrical portion 13 and the vertical cylinder 16. A liquid flow path from the suction pipe 1 to the injection cylinder 17 is formed by communicating the inside of the cylinder portion 13 and the injection cylinder 17, and a suction valve 25 is disposed upstream of the cylinder in the liquid flow path, and a discharge valve is disposed downstream thereof. It is a thing of the well-known mechanism which each provided 26. Further, in this embodiment, an outside air introduction path having one end opened at the rear part of the inner surface of the cylinder and the other end opened in the container neck is provided with a known check valve in the outside air introduction path. In the inverted state, the outside air introduction path is shut off, and in the upright state, the check valve is opened into the negative pressure container to introduce outside air.
[0020]
Next, the case where the above-mentioned ejector equipped with the suction pipe 1 of the present invention is used will be described. In the upright state of the ejector, the plunger 24 is pushed by the pulling operation of the trigger 20, and the liquid in the cylinder 18 pressurized thereby opens the discharge valve 26 and ejects from the ejection port c of the nozzle head 22. When the plunger 24 moves forward, the discharge valve 26 is closed due to the negative pressure in the cylinder 18, the suction valve 25 is opened, and the liquid in the container is sucked up from the lower end opening of the pipe body 3 of the suction pipe 1. Introduced in.
[0021]
Further, when the ejector is inverted, the annular body 4 shifts to the pump B side by its own weight, the through hole b opens, and when the trigger 20 is pulled, liquid is ejected from the ejection port c and the plunger 24 is moved forward. At this time, the liquid in the container is introduced into the cylinder 18 through the through hole b.
[0022]
In each of the above embodiments, the example of the liquid ejector in which the trigger type pump is mounted on the container body has been described. However, the suction pipe of the present invention is a liquid ejecting apparatus in which a vertical head type pump is mounted on the container body. Of course, it can also be used in a vessel.
[0023]
【The invention's effect】
As described above, the suction pipe of the liquid ejector of the present invention has a cylindrical member having a rigid upper and lower end opening and a tightly fitted upper end to the suction port a at the lower end of the liquid ejection pump B fitted to the container body. 2, a pipe body 3 having a vertically long cylindrical shape in which the upper end portion is closely fitted to the lower end portion of the cylindrical member, and a lower end of the pipe member 3 depending on the lower portion of the container body, and a through hole b formed in the lower portion of the cylindrical wall of the cylindrical member 2 Is attached to the outer periphery of the cylinder wall so that it can move up and down with a predetermined width, and is provided with an annular body 4 that moves by its own weight and opens the through hole b when inverted, so that the mounted ejector is inverted. Alternatively, the annular body 4 can be surely moved up and down by being guided by the cylindrical member 2 simply by erecting, and the liquid inlet in the container body can be automatically changed so that it can be smoothly upright or inverted. The liquid can be ejected, and it is firmly fixed to the suction port of an existing pump. For good only, no different on a conventional siphoning pipe and handling.
[0024]
In addition, since the structure is simple, it is easy to manufacture and has the advantage of being inexpensively manufactured.
[0025]
Further, a cylindrical substrate 7 in which tapered cylindrical sliding portions 6 and 6 each having a tip edge fitted to the outer periphery of the cylindrical wall of the cylindrical member 2 are projected from the inner peripheral upper and lower edges, and fitted and fixed to the outer periphery of the substrate. For those provided with an annular body made up of the cylindrical weight 8, it is possible to combine good sealing and sliding properties with sufficient weight necessary for vertical movement, so select them appropriately By doing so, it has the advantage that it can be applied regardless of the type of liquid.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a suction pipe according to the present invention.
FIG. 2 is an enlarged sectional view of a main part in an inverted state in the same embodiment.
FIG. 3 is a longitudinal sectional view of an essential part showing another embodiment of the present invention.
FIG. 4 is an enlarged cross-sectional view of a main part in an inverted state in the same embodiment.
[Explanation of symbols]
2 ... cylindrical member, 3 ... pipe body, 4 ... annular body, 6 ... sliding part, 7 ... cylindrical substrate,
8 ... Weight, A ... Container body, B ... Liquid jet pump, a ... Suction port, b ... Through hole

Claims

The upper end is fitted to the suction port a at the lower end of the liquid jet pump B that is tightly fitted to the container body A, and the upper end is tightly fitted to the cylindrical member 2 having a cylindrical shape with rigid upper and lower end openings. The pipe body 3 that has a vertically long cylindrical shape that is fitted, and the lower end of the pipe body 3 hangs down to the lower part of the container body, and the through-hole b that is formed in the lower part of the cylindrical wall of the cylindrical member 2 are closed. And an annular body 4 that shifts by its own weight when it is inverted and opens the through hole b, and the annular body 4 has a leading edge fitted to the outer circumference of the cylindrical wall of the cylindrical member 2. A liquid discharger comprising: a cylindrical substrate 7 having tapered cylindrical sliding portions 6 and 6 projecting from the inner peripheral upper and lower edges; and a cylindrical weight 8 fitted and fixed to the outer periphery of the substrate. Suction pipe.