JP3681841B2

JP3681841B2 - Return mechanism of the ejection drive unit in the liquid ejection pump

Info

Publication number: JP3681841B2
Application number: JP29942196A
Authority: JP
Inventors: 和仁桑原; 岸　　隆生
Original assignee: Yoshino Kogyosho Co Ltd
Current assignee: Yoshino Kogyosho Co Ltd
Priority date: 1996-10-22
Filing date: 1996-10-22
Publication date: 2005-08-10
Anticipated expiration: 2016-10-22
Also published as: JPH10120012A

Description

【０００１】
【発明の属する技術分野】
本発明は液体噴出ポンプに於ける噴出駆動部の復帰機構に関する。
【０００２】
【従来の技術】
液体噴出ポンプとして、例えば、装着する容器体内に下端を垂下させた状態で固定させるシリンダの上端開口より上方付勢状態で上下動可能に突出させたステム上端に押し下げヘッドを嵌着固定してなる噴出駆動部を備え、該噴出駆動部の上下動により容器体内の液を吸い上げてヘッドの噴出口より噴出する如く構成してなる所謂押し下げヘッド式のもの、或いは、装着した容器体上方に横設固定したシリンダの前端開口より前方付勢状態で前後動可能に突設したピストンロッドの先端にトリガーを連携させた噴出駆動部を備え、該噴出駆動部の前後動により容器体内の液を吸い上げて上記シリンダを含むポンプ本体の噴出口より噴出する如く構成してなる所謂トリガー式のもの等が知られている。
【０００３】
【発明が解決しようとする課題】
従来のこの種ポンプに於ける噴出駆動部の復帰機構、即ち、前者にあっては噴出駆動部を押し下げた際に元の上昇位置に復帰する復帰機構、或いは後者にあっては、トリガーを手前に引いてピストンロッドが後方へ移行した際に、それらが元の前方位置に復帰する復帰機構として一般に金属製のコイルスプリングを使用している。
【０００４】
噴出駆動部の復帰機構に上記金属製のコイルスプリングを採用しているものでは、良好な復帰機能を発揮してポンプの良好な液注出機能を発揮できるものではあるが、近年の廃棄物処理事情では、金属とプラスチックの分別処理が要望され、従来のものでは、これらコイルスプリングが一般に微細であること、内部に密閉されていること等の理由によりこの分別が極めて困難であった。
また、組み立てに際しても、これらコイルスプリングは微細のため取り扱いが不便であった。
【０００５】
この様な事情を考慮してプラスチック製のコイルスプリング使用の試みも行われているようではあるが、プラスチック製のコイルスプリングは現状では弾発力に劣り、その結果、噴出駆動部の作動に支障を来す虞があり、いまのところ現実的ではない。
【０００６】
本発明は上記した点に鑑みなされたもので、金属製のコイルスプリングに代わる合成樹脂等により成形できるとともに、優れた噴出駆動部の復帰能力を備え、また、構造も簡単で容易に製造できる利点も兼ね備えた噴出駆動部の復帰機構を提案するものである。
【０００７】
第１の手段として、噴出駆動部２の往復動により装着した容器体内の液を吸い上げて噴出口より噴出する如く構成した液体噴出ポンプＡに於ける噴出駆動部の復帰機構１であって、噴出駆動部２と、該噴出駆動部２が内部で往復動するシリンダ６との間に、一端開口部をシリンダ６に摺動可能に嵌合させた可動シール部３で閉塞するとともに、噴出駆動部２が摺動可能に嵌合され且つシリンダ６に固定した固定シール部で他端開口部を閉塞することにより密閉した空気室Ｒを設け、上記可動シール部３は上記噴出駆動部２と連動して空気室Ｒを拡張するとともに、拡張させた空気室Ｒの負圧による可動シール部３の復帰に伴って噴出駆動部２を復帰させる如く構成した。
【０００８】
第２の手段として、上記第１の手段に於いて、上記液体噴出ポンプＡが、容器体内に下端を垂下させた状態で固定させるシリンダ６の上端開口より上下動可能に突出させたステム７の上端に噴出口付きの押し下げヘッド８を固定してなる噴出駆動部2aを備えた押し下げヘッド式の液体噴出ポンプA1である如く構成した。
【０００９】
第３の手段として、上記第２の手段に於いて、上記空気室Ｒが、シリンダ６上端部に外周縁部を密嵌し且つ内周縁部をステム７外面に摺動可能に密嵌させた環状の固定シール部15下方のシリンダ６とステム７との間に設けた空気室R1であり、上記可動シール部３がステム７外周下部より突設してその外周面をシリンダ６内面に摺動可能に密嵌させることにより空気室R1の下端開口部を閉塞させてなる環状の可動シール部3aである如く構成した。
【００１０】
第４の手段として、容器体内に下端を垂下させた状態で固定させるシリンダ６の上端開口より上下動可能に突出させたステム７の上端に噴出口付きの押し下げヘッド８を固定してなる噴出駆動部 2a を備えた押し下げヘッド式の液体噴出ポンプ A1 に於ける噴出駆動部の復帰機構１であって、シリンダ６内下部中央に下端開口の筒状部 17 を画成するとともに、該筒状部内周面に板状の可動シール部 3b の外周縁を摺動可能に密嵌させて空気室 R2 を形成し、可動シール部 3b 下面に一端を固定するとともに、上面を上記噴出駆動部 2a 下面に当接させ、且つ、シリンダ６内中央部を上下動可能に異形連結部 18 を設けて可動シール部 3b を噴出駆動部 2a と連動変移する如く構成し、噴出駆動部 2a の押し下げにより拡張させた空気室 R2 の負圧による可動シール部 3b の復帰に伴って噴出駆動部 2a を復帰させる如く構成した。
【００１１】
第５の手段として、前記第１の手段に於いて、上記液体噴出ポンプＡが、装着した容器体上方にシリンダ６を横設したポンプ本体９を固定するとともに、シリンダ６の前端開口より前後動可能に突設したピストンロッド10にトリガー11を連携させた噴出駆動部2bを有するトリガー式の液体噴出ポンプA2である如く構成した。
【００１２】
第６の手段として、前記第５の手段に於いて、上記空気室Ｒが、シリンダ６前端部に外周縁部を密嵌し且つ内周縁部をピストンロッド10外面に摺動可能に密嵌させた環状の固定シール部25後方のシリンダ６とピストンロッド10との間に設けた空気室R3であり、上記可動シール部３が、ピストンロッド10外周後部より突設してその外周縁をシリンダ内面に摺動可能に密嵌させることにより空気室R3の後端開口部を閉塞させた環状の可動シール部3cである如く構成した。
【００１３】
第７の手段として、装着した容器体上方にシリンダ６を横設したポンプ本体９を固定するとともに、シリンダ６の前端開口より前後動可能に突設したピストンロッド 10 にトリガー 11 を連携させた噴出駆動部 2b を有するトリガー式の液体噴出ポンプ A2 に於ける噴出駆動部の復帰機構１であって、ポンプ本体９の後部より後方に後端開口の筒状部 27 を突設し、該筒状部内周面に可動シール部 3d の外周縁を摺動可能に密嵌させて空気室 R4 を形成し、上記トリガー 11 と可動シール部３とを機械的に連携させて可動シール部 3d を上記噴出駆動部 2b と連動変移する如く構成し、トリガー 11 の作動により拡張させた空気室 R4 の負圧による可動シール部 3d の復帰に伴って噴出駆動部 2b を復帰させる如く構成した。
【００１４】
【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、本発明の復帰機構１は、液体噴出ポンプＡに於ける噴出駆動部２の復帰機構であって、密閉された空気室Ｒと、上記噴出駆動部２と連動して空気室Ｒを拡張する如く変位する可動シール部３とを備え、拡張させた空気室Ｒの負圧による可動動シール部３の復帰に伴って噴出駆動部２を復帰させる如く構成したものである。
【００１５】
上記液体噴出ポンプＡとして、噴出駆動部２の往復動により装着した容器体４内の液を吸い上げて噴出口５より噴出する如く構成したものであれば、どの様なものにも採用でき、例えば、図１乃至図３に示す如く、容器体４内に下端を垂下させた状態で固定させるシリンダ６の上端開口より上下動可能に突出させたステム７の上端に噴出口付きの押し下げヘッド８を固定してなる噴出駆動部2aを備えた押し下げヘッド式の液体噴出ポンプA1、或いは、図４乃至図７に示す如く、装着した容器体上方にシリンダ６を横設したポンプ本体９を固定するとともに、シリンダ６の前端開口より前後動可能に突出したピストンロッド10にトリガー11を連携させた噴出駆動部2bを有するトリガー式の液体噴出ポンプA2等が挙げられる。
【００１６】
上記各ポンプは、例えばシリンダ６内面に外周縁を摺動可能に嵌合させた環状ピストン12をステム７下部或いはピストンロッド10後部に連携させ、また、シリンダ６を介してその上流に吸い込み弁13を、下流に吐出弁14を備え、噴出駆動部２の押し込みにより加圧させたシリンダ６内の液が吐出弁14を開いて噴出口５より噴出され、また、噴出駆動部２の復帰の際にはシリンダ６内が負圧化して吐出弁14が閉じ、吸い込み弁13が開いて容器体内の液を吸い上げる如く構成した公知のポンプ機構を備えたものが採用できる。
【００１７】
上記空気室Ｒ及び可動シール部３の形態は、一端開口部を可動シール部３で閉塞することにより密閉された空気室Ｒであれば、また、噴出駆動部２と連動して空気室Ｒを拡張する如く変移する可動シール部であれば種々採用できるものである。また、空気室Ｒの可動シール部３変移前の大きさ、或いは変移後の大きさ等は、ポンプ全体の大きさや収納液の粘度等の種々の条件により適宜選択すると良い。因みに、空気室Ｒの可動シール部３の変移前の大きさが大きければ噴出駆動部２の可動を行い易く、反面復帰力は小さくなると思われる。
【００１８】
図１に示す押し下げヘッド式ポンプA1の実施例の場合は、空気室Ｒを、シリンダ６内上部のステム７との間に設けた空気室R1として構成しており、この空気室R1は、シリンダ６上端部に外周縁部を密嵌し且つ内周縁部をステム７外面に摺動可能に密嵌させた環状の固定シール部15下方のシリンダ６とステム７との間に設けている。また可動シール部３は、ステム７外周下部より突設してその外周面をシリンダ６内面に摺動可能に密嵌させた環状をなす可動シール部3aとして構成しており、上記空気室R1の下端開口部を閉塞する如く構成している。本実施例では、この可動シール部3aを噴出駆動部2aの環状ピストン12と兼用している。
【００１９】
この場合には、押し下げヘッド８を押し下げると可動シール部3aが下方へ移行して空気室R1が拡張し、押し下げヘッド８の押圧を解除すると空気室の負圧化により可動シール部3aが上昇し、それに伴って噴出駆動部2a全体が上昇して元の状態に復帰する如く構成している。
【００２０】
また、押し下げヘッド式ポンプの場合に図２及び３に示す実施例の如く、空気室Ｒをシリンダ内下部中央に設けることもできる。本実施例では、空気室Ｒを、シリンダ６内下部に周方向複数突設した連結板16を介して下端開口の筒状部17をシリンダ６内下部中央に画成し、その内部に形成した空気室R2として構成している。また、可動シール部３は、上記筒状部17内周上端部に外周縁を摺動可能に密嵌させた板状の可動シール部3bとして構成し、該シール部により空気室R2下端開口部を閉塞している。更に、可動シール部3b下端に一端を固定するとともに、上面を噴出駆動部２下面に当接させ、且つ、上下動可能に設けた異形連結部18を設けることにより、可動シール部3bを上記噴出駆動部2aと連動変移する如く構成している。本実施例の異形連結部18は、上記可動シール部3bを上端に固定した支柱19を底板20上面中央部より起立させるとともに、底板20周縁部より上記筒状部17周囲に起立させた周壁21上面をステム７下面に当接係止させて構成している。また、その周壁21上部には、上記各連結板16を挿通可能な縦切り溝22を周方向所定数設けている。また、本実施例の場合は、上記筒状部17の頂板部23中央下面に凹部24を設け、可動シール部3bの上面が筒状部の頂板部23下面に密接した状態で係止されており、空気室R2が最小状態では、空気室R2の空気量はこの凹部24内に存在する空気量としている。
【００２１】
この場合も押し下げヘッド８を押し下げると異形連結部18を介して可動シール部3bが下方へ移行して空気室R2が拡張し、押し下げヘッド８の押圧を解除すると空気室R2の負圧化により可動シール部3bが上昇し、それに伴って噴出駆動部2b全体が上昇して元の状態に復帰する。
【００２２】
また、図４及び図５に示す如きトリガー式ポンプA2の場合は、上記空気室Ｒを、シリンダ６前端部に外周縁部を密嵌し且つ内周縁部をピストンロッド10外面に摺動可能に密嵌させた環状の固定シール部25後方のシリンダ６とピストンロッド10との間に設けた空気室R3として構成している。また、可動シール部３は、ピストンロッド10の外周後部より突設してその外周縁をシリンダ６内面に摺動可能に密嵌させた環状をなし、上記空気室の後端開口部を閉塞する如く構成した可動シール部3cとして構成している。本実施例でも、可動シール部3cを環状ピストン12と兼用している。更に、可動シール部3cの前面をフラットに形成してその中央部にリング状の凹部26を設けており、可動シール部3cの前面が空気室R3の前壁後面に密接した状態で係止されており、空気室R3の最小状態では、空気室R3の空気量はこの凹部26内に存在する空気量としている。そして、図４の状態からトリガー11を手前に引くと空気室R3が拡張されつつピストンロッド10が後方へ移行し、次いでトリガー11の押圧を解除することにより、負圧化した空気室R3により可動シール部3cが前方へ移行し、それに伴ってピストンロッド10及びトリガー11が前方へ移行し、元の状態に復帰する如く構成している。
【００２３】
また、図６及び図７に示すトリガー式ポンプA2の場合は、空気室Ｒは、上記ポンプ本体９の後部より後方に突設した後端開口の筒状部27内に形成した空気室R4として構成しており、可動シール部３は、この筒状部27内周面に外周縁を摺動可能に密嵌させて空気室の後端開口部を閉塞させた板状に構成した可動シール部3dとして構成している。また、トリガー11と可動シール部3dとを機械的に連携させて可動シール部3dを上記噴出駆動部2bと連動変移する如く構成している。本実施例では、可動シール部3d後面より取り付け用突部28を突設し、また、上記トリガー11両側にそれぞれ一端を軸着するとともに、ポンプ本体９外方を通り後方へ延設して、上記取り付け用突部28両側に他端をそれぞれ軸着させた連結杆29を設けてトリガー11と可動シール部3dとを機械的に連携させている。また、筒状部27の前壁を形成するポンプ本体後壁に凹部30を設け、可動シール部3dの前面が筒状部の前壁後面に密接した状態で係止されており、空気室R4が最小状態では空気室の空気量はこの凹部30内に存在する空気量としている。
【００２４】
この場合はトリガー11を手前に引くとピストンロッド10が後方へ移行するとともに、空気室R4が拡張されつつ可動シー部3dが筒状部27内を後方へ移行し、次いでトリガー11の押圧を解除することにより、負圧化した空気室R4により可動シール部3dが前方へ移行し、それに伴ってトリガーが前方へ押し戻されるとともに、トリガー11と連携させているピストンロッド10が前方へ引き戻され、元の状態に復帰する如く構成している。
【００２５】
尚、上記各部材は全て合成樹脂を使用して形成することができ、必要に応じてエラストマー等を併用して形成することができる。
【００２６】
【発明の効果】
以上説明した如く本発明復帰機構は、噴出駆動部２の往復動により装着した容器体内の液を吸い上げて噴出口より噴出する如く構成した液体噴出ポンプＡに於ける噴出駆動部の復帰機構１であって、密閉された空気室Ｒと、上記噴出駆動部２と連動して空気室Ｒを拡張する如く変位する可動シール部３とを備え、拡張させた空気室Ｒの負圧による可動シール部３の復帰に伴って噴出駆動部２を復帰させる如く構成したので、従来のこの種ポンプに於ける復帰機構の如き金属製のコイルスプリングを使用しないで、合成樹脂或いはエラストマー等のポンプ本体と分別処理の必要のない材質により形成することができ、しかも、噴出駆動部の復帰能力にも優れて円滑なポンプ機能を発揮できるものである。
また、その構造も簡単であるため、容易且つ安価に製造できる利点も兼ね備えている。
【００２７】
また、第３，第４及び第６の手段に記載した復帰機構では、それを備えるポンプが、従来のその種ポンプと比較して全く或いは其ほど大きさを増すことなく形成できる利点も兼ね備えている。
【図面の簡単な説明】
【図１】本発明復帰機構を備えた押し下げヘッド式ポンプの一例を示す半断面図である。
【図２】本発明復帰機構を備えた押し下げヘッド式ポンプの他の例を示す縦断面図である。
【図３】同実施例の噴出駆動部を押し下げた状態を示す縦断面図である。
【図４】本発明復帰機構を備えたトリガー式ポンプの一例を示す縦断面図である。
【図５】同実施例の噴出駆動部を後方へ押し込んだ状態を示す縦断面図である。
【図６】本発明復帰機構を備えたトリガー式ポンプの他の例を示す縦断面図である。
【図７】同実施例の噴出駆動部を後方へ押し込んだ状態を示す縦断面図である。
【符号の説明】
１…復帰機構，２，2a，2b…噴出駆動部，
３，3a，3b，3c，3d…可動シール部，
６…シリンダ，７…ステム，８…押し下げヘッド，９…ポンプ本体，
１０…ピストンロッド，１１…トリガー，１５…固定シール部，
１７…筒状部，１８…異形連結部，２５…固定シール部，２７…筒状部，
Ａ…液体噴出ポンプ，Ａ１…押し下げヘッド式液体噴出ポンプ，
Ａ２…トリガー式液体噴出ポンプ，Ｒ，Ｒ１，Ｒ２，Ｒ３，Ｒ４…空気室[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a return mechanism of an ejection drive unit in a liquid ejection pump.
[0002]
[Prior art]
As a liquid ejection pump, for example, a push-down head is fitted and fixed to the upper end of a stem that is protruded so as to be vertically movable from the upper end opening of a cylinder that is fixed in a state where the lower end is suspended in a container body to be mounted. A so-called push-down head type comprising a jet drive unit, which is configured to suck up the liquid in the container body by the vertical movement of the jet drive unit and eject the liquid from the jet port of the head, or horizontally installed above the mounted container body The front end of the fixed cylinder is equipped with an ejection drive unit that is linked to a trigger at the tip of a piston rod that projects forward and backward in a biased state, and sucks up the liquid in the container by the longitudinal movement of the ejection drive unit. A so-called trigger type or the like configured to be ejected from an ejection port of a pump body including the cylinder is known.
[0003]
[Problems to be solved by the invention]
In the conventional pump of this type, the return mechanism of the ejection drive unit, that is, in the former case, the return mechanism that returns to the original raised position when the ejection drive unit is pushed down, or in the latter case, the trigger is in front. Generally, a metal coil spring is used as a return mechanism for returning to the original front position when the piston rod moves rearwardly.
[0004]
If the metal coil spring is used for the return mechanism of the ejection drive unit, it can demonstrate a good return function and a good pumping function of the pump. According to circumstances, separation processing of metal and plastic is required, and in the conventional one, this separation is extremely difficult due to the fact that these coil springs are generally fine and sealed inside.
Also, when assembling, these coil springs are fine and inconvenient to handle.
[0005]
Although it seems that attempts have been made to use plastic coil springs in consideration of such circumstances, plastic coil springs are currently inferior in resilience and, as a result, hinder the operation of the ejection drive unit. It is not realistic so far.
[0006]
The present invention has been made in view of the above points, and can be molded from a synthetic resin or the like in place of a metal coil spring, and has an excellent return drive capability, and has a simple structure and can be easily manufactured. In addition, the present invention proposes a return mechanism for the ejection drive unit that also has the same function.
[0007]
As a first means, there is provided a return mechanism 1 for an ejection drive unit in a liquid ejection pump A configured to suck up the liquid in the container mounted by reciprocation of the ejection drive unit 2 and eject the liquid from the ejection port. Between the drive unit 2 and the cylinder 6 in which the ejection drive unit 2 reciprocates, one end opening is closed with a movable seal unit 3 slidably fitted to the cylinder 6, and the ejection drive unit 2 is slidably fitted, and a fixed seal portion fixed to the cylinder 6 closes the other end opening to provide a sealed air chamber R. The movable seal portion 3 is linked to the ejection drive portion 2. The air chamber R is expanded, and the ejection drive unit 2 is returned along with the return of the movable seal portion 3 due to the negative pressure of the expanded air chamber R.
[0008]
As a second means, in the first means, the liquid jet pump A is provided with a stem 7 protruded so as to move up and down from the upper end opening of the cylinder 6 fixed in a state where the lower end is suspended in the container body. It is configured to be a depressing head type liquid ejecting pump A1 provided with an ejecting drive unit 2a in which a depressing head 8 with an ejection port is fixed to the upper end .
[0009]
As a third means, in the second means, the air chamber R has the outer peripheral edge closely fitted to the upper end of the cylinder 6 and the inner peripheral edge closely slidably fitted to the outer surface of the stem 7. An air chamber R1 provided between the cylinder 6 below the annular fixed seal 15 and the stem 7. The movable seal 3 protrudes from the lower outer periphery of the stem 7 and slides its outer peripheral surface to the inner surface of the cylinder 6. The annular movable seal portion 3a is configured such that the lower end opening of the air chamber R1 is closed by close fitting as possible .
[0010]
As a fourth means, a jet drive in which a push-down head 8 with a jet port is fixed to the upper end of a stem 7 that is protruded from the upper end opening of a cylinder 6 that is fixed in a state where the lower end is suspended in the container body. A return mechanism 1 of an ejection drive unit in a push-down head type liquid ejection pump A1 having a portion 2a , which defines a cylindrical portion 17 having a lower end opening at the lower center of the inside of the cylinder 6, and in the cylindrical portion The outer peripheral edge of the plate-shaped movable seal portion 3b is slidably fitted to the peripheral surface to form an air chamber R2 , one end is fixed to the lower surface of the movable seal portion 3b , and the upper surface is fixed to the lower surface of the ejection drive portion 2a . brought into contact, and the movable sealing portion 3b is composed as interlocked transition and ejection driving portion 2a of the cylinder 6 central portion vertically movably provided profiled connecting portion 18 was extended by the depression of the ejection driving portion 2a return of the movable sealing portion 3b due to the negative pressure in the air chamber R2 With the configuration as to return the jet drive section 2a with.
[0011]
As a fifth means, in the first means, the liquid jet pump A fixes the pump body 9 in which the cylinder 6 is horizontally disposed above the mounted container body, and moves back and forth from the front end opening of the cylinder 6. A trigger-type liquid jet pump A2 having a jet drive unit 2b in which a trigger 11 is linked to a piston rod 10 projecting from the piston rod 10 is configured.
[0012]
As a sixth means, in the fifth means, the air chamber R has the outer peripheral edge portion closely fitted to the front end portion of the cylinder 6 and the inner peripheral edge portion is slidably fitted to the outer surface of the piston rod 10. An air chamber R3 provided between the cylinder 6 behind the annular fixed seal portion 25 and the piston rod 10, and the movable seal portion 3 protrudes from the outer periphery rear portion of the piston rod 10 and the outer periphery thereof is connected to the inner surface of the cylinder. It is configured so as to be an annular movable seal portion 3c in which the rear end opening of the air chamber R3 is closed by being slidably fitted in the air .
[0013]
As a seventh means, a pump body 9 in which a cylinder 6 is disposed horizontally is fixed above a mounted container body, and a jet 11 in which a trigger 11 is linked to a piston rod 10 projecting from a front end opening of the cylinder 6 so as to move back and forth. A return mechanism 1 for an ejection drive unit in a trigger-type liquid ejection pump A2 having a drive unit 2b, and a tubular part 27 having a rear end opening is provided behind the rear part of the pump body 9 so as to project. An air chamber R4 is formed by slidably fitting the outer periphery of the movable seal portion 3d to the inner peripheral surface of the portion , and the trigger 11 and the movable seal portion 3 are mechanically linked to eject the movable seal portion 3d. The drive unit 2b is configured to move in conjunction with the drive unit 2b , and the ejection drive unit 2b is returned along with the return of the movable seal unit 3d due to the negative pressure of the air chamber R4 expanded by the operation of the trigger 11 .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in the drawings, return mechanism 1 of the present invention is a return mechanism in jet drive unit 2 to the liquid jet pump A, and the air chamber R which is closed, in conjunction with the upper Symbol jet driving unit 2 the air A movable seal portion 3 that is displaced so as to expand the chamber R is provided, and the ejection drive portion 2 is returned along with the return of the movable seal portion 3 due to the negative pressure of the expanded air chamber R.
[0015]
As the liquid jet pump A, any liquid pump can be adopted as long as it is configured to suck up the liquid in the container body 4 mounted by the reciprocating motion of the jet drive unit 2 and eject the liquid from the jet outlet 5. As shown in FIGS. 1 to 3, a push-down head 8 with a spout is provided at the upper end of a stem 7 that protrudes from the upper end opening of a cylinder 6 that is fixed in a state where the lower end is suspended in the container body 4. As shown in FIGS. 4 to 7, the pump head 9 having the cylinder 6 disposed horizontally above the mounted container body is fixed, as shown in FIGS. Examples thereof include a trigger type liquid jet pump A2 having a jet driving portion 2b in which a trigger 11 is linked to a piston rod 10 projecting from a front end opening of a cylinder 6 so as to be movable back and forth.
[0016]
In each of the above pumps, for example, an annular piston 12 whose outer peripheral edge is slidably fitted to the inner surface of the cylinder 6 is linked to the lower portion of the stem 7 or the rear portion of the piston rod 10, and the suction valve 13 is provided upstream thereof via the cylinder 6. The discharge valve 14 is provided downstream, and the liquid in the cylinder 6 pressurized by pushing the ejection drive unit 2 is ejected from the ejection port 5 by opening the discharge valve 14, and when the ejection drive unit 2 returns. The cylinder 6 can be provided with a known pump mechanism configured such that the pressure in the cylinder 6 is reduced, the discharge valve 14 is closed, and the suction valve 13 is opened to suck up the liquid in the container.
[0017]
Form of the air chamber R and the movable seal portion 3, if the air chamber R is closed by closing one end opening in the movable sealing part 3, also the air chamber R in conjunction with the ejection drive section 2 Various movable seals can be used as long as they move so as to expand. In addition, the size of the air chamber R before the movable seal portion 3 is changed, or the size after the change is suitably selected according to various conditions such as the size of the entire pump and the viscosity of the stored liquid. Incidentally, if the size of the movable seal portion 3 in the air chamber R before the change is large, the ejection drive portion 2 can be easily moved, and on the other hand, the return force is considered to be small.
[0018]
In the case of the embodiment of the push-down head type pump A1 shown in FIG. 1, the air chamber R is configured as an air chamber R1 provided between the upper portion of the cylinder 6 and the stem 7, and this air chamber R1 is a cylinder. 6 is provided between the cylinder 6 and the stem 7 below the annular fixed seal portion 15 in which the outer peripheral edge portion is closely fitted to the upper end portion and the inner peripheral edge portion is slidably fitted to the outer surface of the stem 7. The movable seal portion 3 is configured as an annular movable seal portion 3a that protrudes from the lower outer periphery of the stem 7 and has an outer peripheral surface closely fitted to the inner surface of the cylinder 6 so as to be slidable. The lower end opening is closed. In this embodiment, the movable seal portion 3a is also used as the annular piston 12 of the ejection drive portion 2a.
[0019]
In this case, when the push-down head 8 is pushed down, the movable seal portion 3a moves downward to expand the air chamber R1, and when the push-down head 8 is released, the movable seal portion 3a rises due to the negative pressure in the air chamber. Along with this, the entire ejection drive unit 2a is raised and returned to its original state.
[0020]
In the case of a push-down head type pump, the air chamber R can be provided at the center in the lower part of the cylinder as in the embodiment shown in FIGS. In this embodiment, the air chamber R is formed in the center of the lower portion of the cylinder 6 by defining a cylindrical portion 17 having a lower end opening through a connecting plate 16 projecting in the circumferential direction at the lower portion of the cylinder 6. It is configured as an air chamber R2. The movable seal portion 3 is configured as a plate-like movable seal portion 3b in which the outer peripheral edge is slidably fitted to the inner peripheral upper end portion of the cylindrical portion 17, and the lower end opening portion of the air chamber R2 by the seal portion. Is blocked. Furthermore, one end is fixed to the lower end of the movable seal portion 3b, the upper surface is brought into contact with the lower surface of the ejection drive unit 2 , and the deformed connecting portion 18 provided so as to be movable up and down is provided. It is configured to shift in conjunction with the drive unit 2a. The deformed connecting portion 18 of the present embodiment has a support wall 19 with the movable seal portion 3b fixed to the upper end thereof upright from the center of the upper surface of the bottom plate 20, and a peripheral wall 21 that stands up around the cylindrical portion 17 from the peripheral portion of the bottom plate 20. The upper surface is configured to be in contact with and locked to the lower surface of the stem 7. In addition, a predetermined number of longitudinal grooves 22 into which the connecting plates 16 can be inserted are provided in the upper part of the peripheral wall 21. Further, in the case of the present embodiment, a recess 24 is provided on the lower surface of the center of the top plate portion 23 of the cylindrical portion 17, and the upper surface of the movable seal portion 3b is locked in close contact with the lower surface of the top plate portion 23 of the cylindrical portion. When the air chamber R2 is in the minimum state, the air amount in the air chamber R2 is the air amount existing in the recess 24.
[0021]
Also in this case, when the push-down head 8 is pushed down, the movable seal portion 3b moves downward through the deformed connecting portion 18 to expand the air chamber R2, and when the push-down head 8 is released from the pressure, the air chamber R2 is moved to a negative pressure to move. The seal part 3b rises, and the entire ejection drive part 2b rises accordingly and returns to the original state.
[0022]
In the case of the trigger type pump A2 as shown in FIGS. 4 and 5, the air chamber R can be slidably fitted to the front end of the cylinder 6 at the outer peripheral edge and the inner peripheral edge can slide on the outer surface of the piston rod 10. It is configured as an air chamber R3 provided between the cylinder 6 and the piston rod 10 behind the closely-fitted annular fixed seal portion 25. The movable seal portion 3 has an annular shape that protrudes from the outer peripheral rear portion of the piston rod 10 and has an outer peripheral edge closely fitted to the inner surface of the cylinder 6 so as to be slidable, and closes the rear end opening of the air chamber. The movable seal portion 3c is configured as described above. Also in this embodiment, the movable seal portion 3c is also used as the annular piston 12. Furthermore, the front surface of the movable seal portion 3c is formed flat, and a ring-shaped recess 26 is provided at the center thereof, and the front surface of the movable seal portion 3c is locked in close contact with the rear surface of the front wall of the air chamber R3. In the minimum state of the air chamber R3, the amount of air in the air chamber R3 is the amount of air existing in the recess 26. When the trigger 11 is pulled forward from the state shown in FIG. 4, the piston rod 10 moves rearward while the air chamber R3 is expanded, and then the pressure of the trigger 11 is released, so that it is movable by the negative pressure air chamber R3. The seal portion 3c moves forward, and accordingly, the piston rod 10 and the trigger 11 move forward and return to the original state.
[0023]
In the case of the trigger type pump A2 shown in FIGS. 6 and 7, the air chamber R is an air chamber R4 formed in a cylindrical portion 27 having a rear end opening projecting rearward from the rear portion of the pump body 9. The movable seal portion 3 is configured in a plate shape in which the outer peripheral edge is slidably fitted onto the inner peripheral surface of the cylindrical portion 27 and the rear end opening of the air chamber is closed. It is configured as 3d. Further, the trigger 11 and the movable seal portion 3d are mechanically linked so that the movable seal portion 3d is moved in conjunction with the ejection drive portion 2b. In the present embodiment, the projecting projection 28 is projected from the rear surface of the movable seal portion 3d, and one end is pivotally attached to both sides of the trigger 11, and the pump main body 9 is extended to the rear, A connecting rod 29 having the other end pivotally mounted on both sides of the mounting projection 28 is provided to mechanically link the trigger 11 and the movable seal portion 3d. Further, a recess 30 is provided in the rear wall of the pump body that forms the front wall of the cylindrical portion 27, and the front surface of the movable seal portion 3d is locked in close contact with the rear surface of the front wall of the cylindrical portion, and the air chamber R4 In the minimum state, the amount of air in the air chamber is the amount of air existing in the recess 30.
[0024]
In this case, when the trigger 11 is pulled forward, the piston rod 10 moves backward, and the air chamber R4 is expanded while the movable sea portion 3d moves backward in the cylindrical portion 27, and then the trigger 11 is released. By doing so, the movable seal portion 3d moves forward due to the negative pressure air chamber R4, and the trigger is pushed back along with it, and the piston rod 10 linked with the trigger 11 is pulled back forward, It is configured to return to this state.
[0025]
In addition, each said member can be formed using a synthetic resin, and can be formed using an elastomer etc. together as needed.
[0026]
【The invention's effect】
As described above, the return mechanism of the present invention is the return mechanism 1 of the ejection drive unit in the liquid ejection pump A configured to suck up the liquid in the container mounted by the reciprocation of the ejection drive unit 2 and eject the liquid from the ejection port. there are an air chamber R which is closed, in conjunction with the upper Symbol jet driving unit 2 and a movable seal unit 3 to as displaced to extend the air chamber R, the movable sealing by the negative pressure of the air chamber R which is expanded Since the ejection drive unit 2 is configured to be returned along with the return of the unit 3, a pump body made of a synthetic resin or an elastomer can be used without using a metal coil spring such as a return mechanism in a conventional pump of this type. It can be formed of a material that does not require a separation process, and can also exhibit a smooth pumping function with excellent return capability of the ejection drive unit.
Moreover, since the structure is also simple, it has the advantage that it can be manufactured easily and inexpensively.
[0027]
In addition, the return mechanism described in the third, fourth and sixth means also has the advantage that the pump provided therewith can be formed without increasing the size at all or so much as compared with the conventional type pump. Yes.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an example of a push-down head type pump provided with a return mechanism of the present invention.
FIG. 2 is a longitudinal sectional view showing another example of a push-down head type pump provided with a return mechanism of the present invention.
FIG. 3 is a longitudinal sectional view showing a state in which the ejection drive unit of the embodiment is pushed down.
FIG. 4 is a longitudinal sectional view showing an example of a trigger type pump provided with the return mechanism of the present invention.
FIG. 5 is a longitudinal sectional view showing a state in which the ejection drive unit of the same embodiment is pushed backward.
FIG. 6 is a longitudinal sectional view showing another example of the trigger type pump provided with the return mechanism of the present invention.
FIG. 7 is a longitudinal sectional view showing a state where the ejection drive unit of the same embodiment is pushed backward.
[Explanation of symbols]
1 ... return mechanism, 2, 2a, 2b ... ejection drive unit,
3, 3a, 3b, 3c, 3d ... movable seal part,
6 ... Cylinder, 7 ... Stem, 8 ... Push-down head, 9 ... Pump body,
10 ... piston rod, 11 ... trigger, 15 ... fixed seal part,
17 ... Cylindrical part, 18 ... Deformed connecting part, 25 ... Fixed seal part, 27 ... Cylindrical part,
A ... liquid jet pump, A1 ... push-down head type liquid jet pump,
A2: Trigger type liquid jet pump, R, R1, R2, R3, R4 ... Air chamber

Claims

A return mechanism 1 for an ejection drive unit in a liquid ejection pump A configured to suck up the liquid in a container mounted by reciprocation of the ejection drive unit 2 and eject the liquid from an ejection port, the ejection drive unit 2, One end opening is closed by a movable seal portion 3 slidably fitted to the cylinder 6 between the jet driving portion 2 and the cylinder 6 reciprocating inside, and the jet driving portion 2 is slidable. An air chamber R sealed by closing the other end opening is provided by a fixed seal portion fitted and fixed to the cylinder 6, and the movable seal portion 3 expands the air chamber R in conjunction with the ejection drive portion 2. And a return mechanism for the ejection drive section, wherein the ejection drive section 2 is restored as the movable seal section 3 is restored by the negative pressure of the expanded air chamber R.

The above-described liquid jet pump A is a jet in which a push-down head 8 with a jet port is fixed to the upper end of a stem 7 that is protruded from the upper end opening of a cylinder 6 that is fixed in a state where the lower end is suspended in the container body. The return mechanism of the ejection drive unit according to claim 1, which is a push-down head type liquid ejection pump A1 provided with a drive unit 2a.

The air chamber R is formed between the stem 6 and the cylinder 6 below the annular fixed seal portion 15 in which the outer peripheral edge is closely fitted to the upper end of the cylinder 6 and the inner peripheral edge is slidably fitted to the outer surface of the stem 7. An air chamber R1 provided therebetween, and the movable seal portion 3 projects from the lower outer periphery of the stem 7 and the outer peripheral surface thereof is slidably fitted to the inner surface of the cylinder 6 so that the lower end opening of the air chamber R1 is formed. The return mechanism of the ejection drive part according to claim 2, which is an annular movable seal part 3a closed.

An ejection drive unit in which a push-down head 8 with an ejection port is fixed to the upper end of a stem 7 that is protruded from the upper end opening of a cylinder 6 that is fixed in a state where the lower end is suspended in the container body. 2a -Down type liquid jet pump equipped with A1 1 is a return mechanism 1 of the ejection drive unit in the cylinder, and a cylindrical part having a lower end opening at the center in the lower part of the cylinder 6 17 And a plate-like movable seal portion on the inner peripheral surface of the cylindrical portion. 3b The air chamber is slidably fitted to the outer peripheral edge of the air chamber. R2 Form a movable seal part 3b While fixing one end to the lower surface, the upper surface is the ejection drive unit 2a A deformed connecting part that is in contact with the lower surface and can move up and down in the center of the cylinder 6 18 Provide a movable seal part 3b The ejection drive unit 2a The jet drive unit 2a Air chamber expanded by pushing down R2 Movable seal due to negative pressure 3b With the return of the jet drive unit 2a A return mechanism for the ejection drive unit, characterized in that it is configured so as to return.

The liquid jet pump A fixes a pump main body 9 having a cylinder 6 provided above a mounted container body, and a trigger 11 is linked to a piston rod 10 projecting forward and backward from the front end opening of the cylinder 6. The return mechanism of the ejection drive unit according to claim 1, which is a trigger type liquid ejection pump A2 having an ejection drive unit 2b.

The air chamber R has a cylinder 6 and a piston rod 10 behind the annular fixed seal portion 25 in which the outer peripheral edge portion is closely fitted to the front end portion of the cylinder 6 and the inner peripheral edge portion is slidably fitted to the outer surface of the piston rod 10. The movable seal portion 3 protrudes from the outer peripheral rear portion of the piston rod 10 and the outer peripheral edge thereof is slidably fitted on the inner surface of the cylinder so that the rear of the air chamber R3 is provided. 6. The return mechanism for an ejection drive unit according to claim 5, wherein the return mechanism is an annular movable seal portion 3c having an end opening closed.

A piston rod that is fixed to a pump body 9 having a cylinder 6 disposed above the mounted container body and that can be moved back and forth from the front end opening of the cylinder 6 Ten Trigger on 11 Squirting drive unit 2b Triggered liquid jet pump with A2 1 is a return mechanism 1 of the ejection drive unit in the above, and is a cylindrical part having a rear end opening behind the rear part of the pump body 9 27 And a movable seal part on the inner peripheral surface of the cylindrical part 3d The air chamber is slidably fitted to the outer peripheral edge of the air chamber. R4 Forming the above trigger 11 And the movable seal portion 3 are mechanically linked to each other to move the movable seal portion. 3d The ejection drive unit 2b It is configured to shift in conjunction with the trigger 11 Air chamber expanded by operation of R4 Movable seal due to negative pressure 3d With the return of the jet drive unit 2b A return mechanism for the ejection drive unit, characterized in that it is configured so as to return.