JP3757348B2

JP3757348B2 - Dishwasher pump

Info

Publication number: JP3757348B2
Application number: JP21508498A
Authority: JP
Inventors: 博之塙; 雄彦原; 興司福田
Original assignee: Mitsubishi Electric Home Appliance Co Ltd; Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Home Appliance Co Ltd; Mitsubishi Electric Corp
Priority date: 1998-07-30
Filing date: 1998-07-30
Publication date: 2006-03-22
Anticipated expiration: 2018-07-30
Also published as: JP2000041931A

Description

【０００１】
【発明の属する技術分野】
本発明は、食器等を洗浄する食器洗浄機において、洗浄水をノズルに圧送し、また、汚れた洗浄水を外部に排出するための食器洗浄機用ポンプに関するものである。
【０００２】
【従来の技術】
食器洗浄機用ポンプは、１台のポンプに洗浄水の吐出口と、洗浄によって汚れた洗浄水（以下、汚水という）の排出口とを設け、モータの正転又は逆転に応じて吐出口又は排出口を開放し、吐出口を開放したときは洗浄水を洗浄ノズルに圧送し、排出口を開放したときは汚水を排水口から外部に排出するようになっており、このための切換弁装置を備えている。
【０００３】
図１３〜図１５は特開平１０−４３１２１号公報（従来技術１）に記載された食器洗浄機及びそのポンプを示すものである。図１３において、６１は食器洗浄機の本体、６２は本体６１の下部に設けられた水槽、６３は洗浄ノズル群、６４は食器かごである。６５はポンプで、６６は水槽６２に接続された洗浄水の吸込口、６７は洗浄ノズル群６３に接続された洗浄水の吐出口、６８は排水口６９に接続された汚水の排出口、７０はポンプ５５を駆動するモータである。
【０００４】
ポンプ６５の構造を示す図１４、図１５において、７１はほぼ円筒状のケーシング本体、７２は蓋、６７はケーシング本体７１に設けた洗浄水の吐出口、６８は吐出口６７に隣接して設けた汚水の排出口、６６は蓋７２に設けた洗浄水の吸込口である。７３はケーシング本体７１内に収容されたインペラで、モータ７０の出力軸に連結されている。
７４は吐出口６７の開口部から排出口６８の開口部にかけて、ケーシング本体７１の内壁に設けた案内溝、７５は案内溝７４に沿って摺動可能に配設された弁板で、一方の端部には、正転流受圧面７７と逆転流受圧面７８からなる受圧リブ７６が設けられている。
【０００５】
上記のようなポンプにおいては、インペラ７３がモータ７０に駆動されて正転方向（図の矢印Ａ方向）に回転すると、弁板７５は吸込口６６から吸込まれた洗浄水により正転流受圧面７７に水圧を受け、案内溝７４に沿って矢印Ａ方向に移動して洗浄水の吐出口６７を開放し、汚水の排出口６８を閉塞する。これにより、洗浄水は吐出口６７から洗浄ノズル群６３に圧送される。
一方、インペラ７３が逆転方向に回転すると、弁板７５は逆転流受圧面７８に水圧を受け、案内溝７４に沿って反矢印方向に移動して排出口６８を開放し、吐出口６７を閉塞する。これにより、汚水は排出口６８から排水口６９に圧送され、外部に排出される。
【０００６】
また、特開平９−２９４７０３号公報（従来技術２）に記載された食器洗い機の洗浄、排水切換弁は、回転軸を有する平板によって形成され、羽根車の回転方向に応じて旋回し、洗浄吐出口又は排水吐出口を開閉するようになっている。
【０００７】
【発明が解決しようとする課題】
従来技術１の切換弁装置は、弁板７５がケーシング本体７１の内壁面及び案内溝７４に沿って移動するので、その摩擦抵抗によって作動性が悪く、特に、残滓のような異物が弁板７５とケーシング本体７１との間に侵入した場合は動作不良を生じ易く、洗浄時に汚水の排出口６８から洗浄水が流出し、洗浄水の不足を来すおそれがある。
【０００８】
また、従来技術２の洗浄、排水切換弁は、平板が洗浄水吐出口又は排水吐出口の開口部に面接触して閉塞するようになっているので、シール性に問題があり、特に、平板とポンプケーシングの間に残滓などの異物が侵入し易く、不安定で従来技術１と同様の問題を生じるおそれがある。
【０００９】
本発明は、上記の課題を解決するためになされたもので、切換弁の動作が確実で、その上シール性に優れた食器洗浄機用ポンプを得ることを目的としたものである。
【００１０】
【課題を解決するための手段】
（１）本発明に係る食器乾燥機用ポンプは、洗浄水の吸込口、羽根車を介して前記吸込口に連通する切換弁収容部、周壁に設けられ前記切換弁収容部に連通する洗浄水吐出口、該洗浄水吐出口に近接して周壁に設けられ前記切換弁収容部に連通する汚水吐出口、及び前記切換弁収容部に収容され前記羽根車の正転又は逆転に応じて前記洗浄水吐出口又は汚水吐出口のいずれか一方を開口する切換弁を有し、該切換弁を、一方の側に開口部を有し他方の側に球状部が設けられて断面ほぼＵ字状に形成され前記開口部から空気が封入されて蓋体で密封された中空の弁体と、一方の側に回転軸を有し前記弁体外周のほぼ中央部を囲繞して該弁体と一体に形成された四角枠状の弁板とによって構成し、前記弁体の開口部を前記洗浄水吐出口側に球状部を前記汚水吐出口側に位置させて、前記弁板の回転軸により前記切換弁収容部に回転自在に配置し、前記切換弁は前記中空の弁体の浮力により摺動部がなく、前記切換弁を、前記浮力を利用し、前記羽根車による洗浄水の圧力により回転軸を中心に水平面内で回動させるようにしたものである。
【００１１】
（３）上記（１）又は（２）の切換弁の弁体を、前記弁体に代えて比重が１より小さい材料により中実に形成した。
【００１２】
（４）上記（１）〜（３）の何れかの切換弁の洗浄水流水路側に、弁体の一部を切除して羽根車の正転時に水圧を受圧する一次動圧受圧面を形成した。
（５）上記（１）〜（３）の四角枠状の弁板により羽根車の正転時又は逆転時に水圧を受圧する一次動圧受圧面及び二次動圧受圧面を形成した。
（６）上記（１）〜（５）の何れかの切換弁をばねにより常時汚水吐出口方向に付勢した。
【００１３】
（７）上記（１）の食器洗浄機用ポンプの洗浄水吐出口及び汚水吐出口の開口部を円形に形成し、該開口部に切換弁の弁体を線接触させるように構成した。
（８）上記（７）の汚水吐出口の開口部に、円形の開口部を有する板状又は環状の弾性座体を取付けた。
（９）上記（８）の弾性座体の開口部の内径を、汚水吐出口の開口部の内径の７０〜９０％の大きさとした。
【００１４】
（１０）上記（１）の羽根車と切換弁との間にほぼ三角形状の整流台を設け、該整流台の羽根車側に該羽根車の回転軌跡に対応した羽根車側壁面を、洗浄水流水路側に洗浄水側壁面を、また切換弁側に該切換弁の回転軌跡に対応した切換弁側
壁面を形成した。
【００１５】
（１１）上記（１）又は（１０）の羽根車と切換弁との間にほぼ三角形状の整流台を設け、該整流台の汚水流水路側の頂部から羽根車の回転軌跡に対応して整流板を延設し、該整流板の先端部と周壁内面との間に汚水流水入口を形成すると共に、前記整流台の羽根車側壁面と洗浄水側壁面の交点と周壁内面との間に洗浄水流入口を形成し、前記汚水流入口を洗浄水流入口より小さく形成した。
【００１６】
（１２）上記（１０）又は（１１）の整流台の洗浄水側壁面と切換弁側壁面との交点を、切換弁が洗浄水吐出口の開口部を閉塞したときの一次動圧受圧面より洗浄水流水路側に位置させると共に、前記切換弁側壁面の頂部を、前記切換弁が汚水吐出口を閉塞したときの一次動圧受圧面より汚水流水路側に位置させた。
【００１７】
【発明の実施の形態】
［実施の形態１］
図１は一部を断面で示した本発明の実施の形態１に係る食器洗浄機用ポンプの正面図、図２は図１の平面図、図３は図２のケーシングの右側面図、図４は図１の分解斜視図、図５は図３のＡ−Ａ断面図で、本発明の食器洗浄機用ポンプは、ポンプ本体１とモータ１５とからなっている。以下、図面を用いて本実施の形態を詳細に説明する。
【００１８】
ポンプ本体１において、２は基台で、ほぼ円形の羽根車取付部３とこれに連続するほぼ台形状の水路部４とからなり、羽根車取付部３のほぼ中心部の下面には、下方に突出した円筒部５が設けられている。そして、この円筒部５内の中央よりやや上方には中心部に貫通穴７を有する隔壁６が設けられており、隔壁６の上部には後述の羽根車のボスが挿入される凹部８が形成され、この凹部８にはメカニカルシール８ａが配設されている。９は水路部４の一方の隅部に設けられ、後述の切換弁の回転軸が回転自在に挿入される丸穴である。なお、２ａは基台２の外周に設けられた複数のねじ挿通穴、２ｂは同じくねじ穴である。
【００１９】
１０は円板１１上に複数の羽根１２が設けられた羽根車で、円板１１の下面中心部にはボス１３が設けられており、このボス１３は基台２に設けた凹部８に配設されたメカニカルシール８ａの中心穴に遊嵌され、隔壁６に設けた貫通穴７から下方に突出する。
１５に正逆回転するモータで、その出力軸１６は羽根車１０のボス１３に連結されている。なお、１７は軸受カバー、１８は基台２に設けたねじ挿通穴２ａに対応して設けられたねじ穴である。
【００２０】
２０は基台２とほぼ同じ平面形状に形成され、ねじにより基台２と一体に結合されたケーシングで、天板２１と周壁２２とからなり、基台２の羽根車取付部３の上方には羽根車収容部２３が形成され、これに連続して切換弁収容部２４が設けられている。２５は基台２の凹部８の直上において天板２１から突設された洗浄水の吸込口である。
【００２１】
２６は切換弁収容部２４の周壁２２から外方に突設された洗浄水吐出口で、周壁２２に設けた円形の開口部２７により切換弁収容部２４に連通している。
２８は洗浄水吐出口２６に近接して周壁２２から外方に突設された汚水吐出口で、周壁２２に設けた円形の開口部２９により切換弁収容部２４に連通している。２９ａは開口部２９の下方及び両側に設けたＵ溝である。
【００２２】
３０は汚水吐出口２８の開口部２９の切換弁収納部２４側に装着された四角形状の弾性座体で、中心部に開口部３１を有し、この開口部３１の周縁には切換弁収容部２４側に突出する例えばチューリップ状のリップ３２が設けられている。この開口部３１の径は、静圧による排水の戻りを少なくするため、汚水吐出口２８の内径より小さく（例えば、７０〜９０％）形成されている。なお、弾性座体３０の形状は四角形状に限定するものではなく、例えばドーナツ状やリング状等、他の形状にしてもよい。また、場合によっては弾性弁体３０を省略してもよい。
【００２３】
３５は切換弁収納部２４の羽根車収容部２３側に、周壁２２とほぼ同じ高さに形成された平面ほぼ三角形状の整流台で、羽根車１０側には羽根車１０の回転軌跡に対応した円弧状の羽根車側壁面３６が形成されており、洗浄水流水路４０側には周壁２２に沿って、かつ所定の間隔を隔てて洗浄水側壁面３７が形成されている。また、切換弁収容部２４側には後述の切換弁の回動軌跡に沿った切換弁側壁面３８が形成されている。この場合、切換弁と切換部側壁面３８との間隙を、残滓等の侵入を防止するために１〜３ｍｍ程度とすることが望ましい。
【００２４】
３９は基台２の丸穴９と対向して設けられた丸穴、４０は周壁２２と整流台３５の洗浄水側壁面３７との間に形成された洗浄水流水路、４１は周壁２２と整流台３５の切換弁側壁面３８との間に形成された汚水流水路である。なお、２０ａはケーシング２０の外周に設けた複数のねじ挿通穴である。
【００２５】
５０は切換弁収容部２４に収容された断面ほぼＵ字状の切換弁で、図６に示すように、例えばショアー硬度６０〜８０の弾性材からなる中空球状の弁体５１の上下左右の４面を切除した平坦面５１ａ，５１ｂ，５１ｃ，５１ｄ（５１ｄは図示せず）と、この平坦面５１ａ〜５１ｄと直交する側の球状部５２と、球状部５２の反対側を周囲に球状部５３を残置させて切除し開口した開口部５４と、弁体５１の外周のほぼ中央部を囲繞して弁体５１と一体に形成された四角枠状の弁板５６と、弁板５６の一方の側に設けた回転軸５７とからなっている。なお、弁板５６を弁体５１と別体に形成し、接着剤等により弁体５１に取付けてもよい。そして、回転軸５７と反対側の弁板５６により一次動圧受圧面５８が形成され、上下の弁板５６により二次動圧受圧面５９が形成される。この場合、弁体５１の一部を切除して一次動圧受圧面を形成してもよく、また、弁体５１は非弾性体で形成してもよい。なお、開口部５４は内部に空気を封入した状態で蓋体５５により閉塞され、浮力が付与されている。
【００２６】
この切換弁５０は、球状部５２を汚水流水路４１側に位置させて切換弁収容部２４内に配置され、回転軸５７が基台２及びケーシング２０に設けた丸穴９，３９に回転自在に嵌入されて支持される。なお、丸穴９，３９は回転軸５７の装着を容易にするため異なる深さとし、かつその内径は回転軸５７が自在に回転しうる大きさになっている。
この場合、前述の整流台３５の洗浄水側壁面３７と切換弁側壁面３８との交点３５ａは、切換弁５０が洗浄水吐出口２６の開口部２７を閉塞したときの一次動圧受圧面５８より洗浄水流水路４０側に位置し、また、切換弁側壁面３８の頂部３５ｂは、切換弁５０が汚水吐出口２８の開口部２９を閉塞したときの一次動圧受圧面５８より汚水流水路４１側に位置する。
【００２７】
次に、上記のように構成した食器洗浄機用ポンプの組立手順の一例を説明する。
先ず、モータ１５の軸受カバー１７に基台２の円筒部５を嵌合し、そのねじ挿通穴２ａに挿通したねじをモータ１５のねじ穴１８に螺入し、両者を一体に結合する。ついで、基台２の凹部８にメカニカルシール８ａを圧入する。そして羽根車１０のボス１３をメカニカルシール８ａの穴に遊嵌し、その先端部をモータ１５の出力軸１６に結合する。これにより、羽根車１０は回転自在にモータ１５に連結される。
【００２８】
次に、弾性座体３０をそのリップ３２を切換弁収容部２４側に向けて、排水吐出口２８の開口部２９の下方及び両側に設けたＵ溝２９ａに圧入する。これにより、弾性座体３０は排水吐出口２８の開口部２９に周壁に圧着されて固定される。なお、Ｕ溝２９ａへの圧入に代えてねじ等により固定してもよい。ついで、切換弁収容部２４に切換弁５０を収容し、その回転軸５７の下部を基台２に設けた丸穴９に遊嵌する。
【００２９】
次に、ケーシング２０を基台２の上面に嵌合し、ねじ挿通穴２０ａに挿通したねじを基台２のねじ穴２ｂに螺入して、両者を一体に結合する。このとき、切換弁５０の回転軸５７の上部がケーシング２０に設けた丸穴３９に嵌入され、切換弁５０は切換弁収容部２４内に回転自在に支持される。
【００３０】
次に、主として図５及び図７を用いて本実施の形態の作用を説明する。
図５の状態でモータ１５に通電して駆動し、羽根車１０を矢印Ａ方向（以下、正転という）に回転させると、吸引口２５から吸引された洗浄水は、羽根車１０の回転エネルギーにより洗浄水吐出口２６から圧送され、噴射ノズルに送られて洗浄水を噴射し、食器等を洗浄する。
【００３１】
このとき、切換弁５０は、自からの浮力に加えて一次動圧受圧面５８及び二次動圧受圧面５９に洗浄水の動圧を受け、回転軸５７を中心に汚水流水路４１側に回動してその球状部５２を弾性座体３０に圧着させ、リップ３２に密着して汚水吐出部２８の開口部２９を閉塞する。これにより、洗浄中に汚水吐出口２８からの洗浄水の漏水が確実に防止され、洗浄水吐出口２６からのみ洗浄水を圧送することができる。なお、切換弁５０は浮力を有しているため、回動に際してはほとんど抵抗がない。
【００３２】
次に、モータ１５を反対方向に回転させると、図７に示すように、羽根車１０は矢印Ｂ方向（以下、逆転という）に回転し、吸込口２５から吸込まれた汚水は、羽根車１０の回転エネルギーにより汚水流水路４１を経て切換弁５０に激しく衝突し、一次動圧受圧面５８及び二次動圧受圧面５９に水圧を受け、切換弁５０を回転軸５７を中心に洗浄水流水路４０側に回動させる。これにより、切換弁５０の開口部５４の周囲の球状部５３が洗浄水吐出口２６の開口部２７の外周に圧接され、開口部２７を閉塞する。同時に、汚水吐出口２８の開口部２９に設けた弾性座体３０の開口部３１が開放され、汚水は汚水吐出口２８から流出し、外部に排出される。
【００３３】
このように、本実施の形態においては、切換弁５０には摺動部がなく、浮力を利用し、羽根車５０による洗浄水の水圧により回転軸５７を中心に回動させ、洗浄水吐出口２６の開口部２７又は汚水吐出口２８の弾性座体３０の開口部３１と線接触してこれらを閉塞するようにしたので、残滓等により開口部２７，３１の開閉が阻害されることがなく、開口部２７又は３１を確実に閉塞することができるこのため、食器等の洗浄水が汚水吐出口２８から漏出するのを防止することができる。
【００３４】
［実施の形態２］
図８は本発明の実施の形態２の平断面図である。なお、実施の形態１と同じ部分にはこれと同じ符号を付し、説明を省略する。
本実施の形態は、整流台３５の汚水流水路４１側の頂部から羽根車１０の回転軌跡に対応して整流板３５ｄを延設し、その先端部と周壁２２の内面との間に汚水流入口４１ａを形成したものである。４０ａは整流台３５の羽根車側壁面３６と洗浄水側壁面３７の交点３５ｃと、周壁２２の内面との間に形成された洗浄水流入口で、汚水流入口４１ａの開口面積は、洗浄水流入口４０ａの開口面積の約１０％程度の大きさに形成されている。
【００３５】
前述の実施の形態１においては、整流台３５の汚水流水路４１側の壁面の頂部と、周壁２２の内面とで形成する開口が大きいため、羽根車１０の正転時に洗浄水を洗浄水吐出口２６に送出している際、羽根車１０からの洗浄水が上記開口から汚水流水路４１側に漏れて切換弁５０を押圧して移動させ、汚水吐出口２８から流水するおそれがある。
本実施の形態においては、整流台３５に整流板３５ｄを設けて汚水流入口４１ａを狭く形成したので、羽根車１０の正転時に汚水流入口４１ａからの漏水がきわめて少ないため切換弁５０が移動することがなく、汚水吐出口２８から洗浄水が流出するおそれがない。
【００３６】
［実施の形態３］
ところで、実施の形態１，２のような食器洗浄機用ポンプにおいて、モータ１５の回転を停止すると、洗浄水吐出口２６から一たん流出した洗浄水が逆流することがあり、このため、切換弁５０が動揺して切換弁５０のシール性が損なわれ、その結果、洗浄水が一時的に汚水吐出口２８から漏水するおそれがある。
本実施の形態は、このような問題に対処するために、切換弁５０をばねにより常時汚水吐出口２８の弾性座体３０に圧接させるように付勢したものである。
【００３７】
すなわち、図９に示すように、切換弁５０の回転軸５７に例えばひねりばねの如きばね６０を装着し、その一端を切換弁５０の例えば弁板５６に係止させ、他端を例えばケーシング２０の内壁に係止させて、切換弁５０を常時汚水吐出口２８の弾性座体３０側に付勢したものである。これにより、切換弁５０の球状部５２は常時弾性座体３０のリップ３２に圧接され、その開口部３１を閉塞している。
【００３８】
上記のように構成した本実施の形態においては、常時は、切換弁５０はばね６０に付勢されて汚水吐出口２８の弾性座体３０の開口部３１を閉塞しており、洗浄水吐出口２６の開口部２７は開放されている。したがって、羽根車１０の正転時には、吸込口２５から吸込まれた洗浄水はそのすべてが洗浄水吐出口２６から噴射ノズルに圧送され、汚水吐出口２８から排水されることはない。
【００３９】
また、羽根車１０が逆転すると、図１０に示すように、切換弁５０は汚水の水圧によりばね６０に抗して回動し、洗浄水吐出口２６の開口部２７を閉塞し、汚水吐出口２８の弾性座体３０の開口部３１を開放して、汚水を汚水吐出口２８から排水する。そして、モータ１５が停止すると、切換弁５０はばね６０の付勢力により再び弾性座体３０の開口部３１を閉塞する。
【００４０】
このように、本実施の形態においては、モータ１５が停止すると切換弁５０が自動的に汚水吐出口２８の弾性座体３０の開口部３１を閉塞するので、洗浄水吐出口２６から洗浄水が逆流しても切換弁５０が動揺することがなく、シール性が確保されて洗浄水が汚水吐出口２８から流出することはない。
なお、本実施の形態は、後述の実施の形態４，５にも実施することができる。
【００４１】
［実施の形態４］
図１１は本発明の実施の形態４の断面図である。本実施の形態は、切換弁５０ａをブロー成形により前述の切換弁５０とほぼ同じ外形で中空に形成し、浮力を持たせたものである。
本実施の形態に係る切換弁５０ａの作用、効果は、実施の形態１の場合と同様である。
【００４２】
［実施の形態５］
図１２は本発明の実施の形態５の断面図である。本実施の形態は、切換弁５０ｂを比重が１より小さい材料により前述の切換弁５０とほぼ同じ外形で中実に形成し、浮力を持たせたものである。
本実施の形態に係る切換弁５０ｂの作用、効果も実施の形態１の場合とほぼ同様であるが、さらに、この切換弁５０ｂは射出成形により製造できるのでコストを低減することができる。
【００４３】
【発明の効果】
（１）本発明に係る食器洗浄機用ポンプは、洗浄水の吸込口、羽根車を介して前記吸込口に連通する切換弁収容部、周壁に設けられ前記切換弁収容部に連通する洗浄水吐出口、該洗浄水吐出口に近接して周壁に設けられ前記切換弁収容部に連通する汚水吐出口、及び前記切換弁収容部に収容され前記羽根車の正転又は逆転に応じて前記洗浄水吐出口又は汚水吐出口のいずれか一方を開口する切換弁を有し、該切換弁を、一方の側に開口部を有し他方の側に球状部が設けられて断面ほぼＵ字状に形成され前記開口部から空気が封入されて蓋体で密封された中空の弁体と、一方の側に回転軸を有し前記弁体外周のほぼ中央部を囲繞して該弁体と一体に形成された四角枠状の弁板とによって構成し、前記弁体の開口部を前記洗浄水吐出口側に球状部を前記汚水吐出口側に位置させて、前記弁板の回転軸により前記切換弁収容部に回転自在に配置し、前記切換弁は前記中空の弁体の浮力により摺動部がなく、前記切換弁を、前記浮力を利用し、前記羽根車による洗浄水の水圧により回転軸を中心に水平面内で回動させるようにしたので、羽根車によって圧送された洗浄水又は汚水が切換弁を回動させてその球状部を洗浄水吐出口又は汚水吐出口の開口部に押圧し、開口部に線接触して閉塞するため大きなシール効果を得ることができ、食器等の洗浄中に汚水吐出口から洗浄水が漏洩することがない。
【００４４】
（２）上記（１）の切換弁の弁体を弾性材で形成したので、洗浄水吐出口又は汚水吐出口の開口部との接触がより良好となり、漏水防止効果が増大する。
【００４５】
（３）上記（１）又は（２）の切換弁の弁体を上記（１）の弁体に代えて比重が１より小さい材料により中実に形成して切換弁に浮力を与えたので、食器等の洗浄中は洗浄水の水圧により汚水吐出口の開口部に圧接されるため、汚水吐出口から洗浄水が流出することがない。
【００４６】
（４）上記（１）〜（３）の何れかの切換弁の洗浄水流水路側に、弁体の一部を切除して羽根車の正転時に水圧を受圧する一次動圧受圧面を形成し、
（５）あるいは、切換弁の四角枠状の弁板により羽根車の正転又は逆転時に水圧を受圧する一次動圧受圧面及び二次動圧受圧面を形成したので、切換弁の切換を確実に行うことができる。
【００４７】
（６）上記（１）〜（５）の何れかの切換弁をばねにより常時汚水吐出口方向に付勢させたので、食器等の洗浄中は、切換弁は洗浄水の水圧及びばねの付勢力により確実に汚水吐出口に圧接されており、また、羽根車の停止時に洗浄水が動揺しても切換弁の不安定な動作を防止することができる。
【００４８】
（７）上記（１）の洗浄水吐出口及び汚水吐出口の開口部を円形に形成し、該開口部に切換弁の弁体を線接触させるようにしたので、洗浄水吐出口及び汚水吐出口のシール効果を向上させることができる。
（８）また、上記（７）の汚水吐出口の開口部に、円形の開口部を有する板状又は環状の弾性座体を取付けたので、切換弁による汚水吐出口のシール効果をさらに向上することができる。
【００４９】
（９）上記（８）の弾性座体の開口部の内径を、汚水吐出口の開口部の内径の７０〜９０％の大きさとしたので、汚水流水路側と汚水吐出側の静圧の差により切換弁を弾性座体に押付ける力が増し、シール効果をより高めることができる。
【００５０】
（１０）上記（１）の羽根車と切換弁との間にほぼ三角形状の整流台を設け、該整流台の羽根車側に該羽根車の回転軌跡に対応した羽根車側壁面を、洗浄水流水路側に洗浄水側壁面を、また切換弁側に該切換弁の回転軌跡に対応した切換弁側壁面を形成したので、送水効率が高く、かつ切換弁の動作が確実な食器洗浄器用ポンプを得ることができる。
【００５１】
（１１）上記（１）又は（１０）の羽根車と切換弁との間にほぼ三角形状の整流台を設け、この整流台の汚水流水路側の頂部から羽根車の回転軌跡に対応して整流板を延設し、この整流板の先端部と周壁内面との間に汚水流水入口を形成すると共に、整流台の羽根車側壁面と洗浄水側壁面の交点と周壁内面との間に洗浄水流入口を形成し、汚水流入口を洗浄水流入口より小さく形成したので、羽根車の正転時に汚水吐出口から洗浄水が流出するのを防止することができる。
【００５２】
（１２）上記（１０）又は（１１）の整流台の洗浄水側壁面と切換弁側壁面との交点を、切換弁が洗浄水吐出口の開口部を閉塞したときの一次動圧受圧面より洗浄水流水路側に位置させると共に、前記切換弁側壁面の頂部を、前記切換弁が汚水吐出口を閉塞したときの一次動圧受圧面より汚水流水路側に位置させたので、食器等の洗浄中又は汚水の排水時に洗浄水又は汚水の水圧が動圧受圧面又は弁体に効果的に作用して、切換弁のシール及び切換動作を確実に行うことができる。
【図面の簡単な説明】
【図１】一部を断面で示した本発明の実施の形態１の正面図である。
【図２】図１の平面図である。
【図３】図２のケーシングの側面図である。
【図４】図１の分解斜視図である。
【図５】本実施の形態の要部を示す平断面図である。
【図６】図４の切換弁の正面斜視図及び背面斜視図である。
【図７】本実施の形態の作用説明図である。
【図８】実施の形態２の要部の平面図である。
【図９】実施の形態３の平断面図である。
【図１０】本実施の形態の作用説明図である。
【図１１】実施の形態４の要部を示す平断面図である。
【図１２】実施の形態５の要部を示す平断面図である。
【図１３】従来の食器洗浄機の一例の説明図である。
【図１４】図１２のポンプの縦断面図である。
【図１５】図１３の平断面図である。
【符号の説明】
１ポンプ本体、２基台、５円筒部、１０羽根車、１５モータ、２０ケーシング、２３羽根車収容部、２４切換弁収容部、２５洗浄水の吸込口、２６洗浄水吐出口、２７，２９開口部、２８汚水吐出口、３０弾性座体、３１開口部、３２リップ、３５整流台、３５ｄ整流板、３６羽根車側壁面、３７洗浄水側壁面、３８切換弁側壁面、４０洗浄水流水路、４１汚水流水路、５０，５０ａ，５０ｂ切換弁、５１弁体、５２，５３球状部、５４開口部、５５蓋体、５６弁板、５７回転軸、５８一次動圧受圧面、５９二次動圧受圧面、６０ばね。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dishwasher pump for pumping wash water to a nozzle and discharging dirty wash water to the outside in a dishwasher for washing dishes and the like.
[0002]
[Prior art]
The dishwasher pump is provided with a discharge port for cleaning water and a discharge port for cleaning water (hereinafter referred to as sewage) contaminated by cleaning in one pump. When the discharge port is opened, the cleaning water is pumped to the cleaning nozzle when the discharge port is opened, and when the discharge port is opened, the sewage is discharged from the drain port to the outside. It has.
[0003]
13 to 15 show a dishwasher and its pump described in JP-A-10-43121 (prior art 1). In FIG. 13, 61 is a main body of the dishwasher, 62 is a water tank provided in the lower part of the main body 61, 63 is a cleaning nozzle group, and 64 is a tableware basket. 65 is a pump, 66 is a suction port for cleaning water connected to the water tank 62, 67 is a discharge port for cleaning water connected to the cleaning nozzle group 63, 68 is a discharge port for sewage connected to the drain port 69, 70 Is a motor for driving the pump 55.
[0004]
14 and 15 showing the structure of the pump 65, 71 is a substantially cylindrical casing body, 72 is a lid, 67 is a discharge port for cleaning water provided in the casing body 71, and 68 is provided adjacent to the discharge port 67. A waste water discharge port 66 is a cleaning water suction port provided in the lid 72. Reference numeral 73 denotes an impeller accommodated in the casing body 71 and is connected to the output shaft of the motor 70.
74 is a guide groove provided on the inner wall of the casing body 71 from the opening of the discharge port 67 to the opening of the discharge port 68, and 75 is a valve plate slidably disposed along the guide groove 74. At the end, a pressure receiving rib 76 composed of a forward flow pressure receiving surface 77 and a reverse flow pressure receiving surface 78 is provided.
[0005]
In the pump as described above, when the impeller 73 is driven by the motor 70 and rotates in the forward rotation direction (the direction of arrow A in the figure), the valve plate 75 is moved forward by the wash water sucked from the suction port 66. 77 receives water pressure, moves in the direction of arrow A along the guide groove 74, opens the cleaning water discharge port 67, and closes the sewage discharge port 68. Thereby, the cleaning water is pumped from the discharge port 67 to the cleaning nozzle group 63.
On the other hand, when the impeller 73 rotates in the reverse direction, the valve plate 75 receives water pressure on the reverse flow pressure receiving surface 78 and moves in the counter-arrow direction along the guide groove 74 to open the discharge port 68 and close the discharge port 67. To do. Thus, the sewage is pumped from the discharge port 68 to the drain port 69 and discharged to the outside.
[0006]
The dishwasher washing / drainage switching valve described in JP-A-9-294703 (Prior Art 2) is formed by a flat plate having a rotating shaft, and swivels in accordance with the rotational direction of the impeller. The outlet or drainage outlet is opened and closed.
[0007]
[Problems to be solved by the invention]
In the switching valve device of the prior art 1, the valve plate 75 moves along the inner wall surface of the casing body 71 and the guide groove 74, and therefore the operability is poor due to the frictional resistance. And the casing main body 71 are liable to cause a malfunction, and the washing water may flow out from the sewage discharge port 68 during washing, resulting in a lack of washing water.
[0008]
Further, the cleaning / drainage switching valve of the prior art 2 has a problem in sealing properties because the flat plate is in contact with the cleaning water discharge port or the opening of the drainage discharge port and is closed. And foreign matter such as residue easily enters between the pump casing and is unstable and may cause the same problem as in the prior art 1.
[0009]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a dishwasher pump having a reliable operation of a switching valve and excellent sealing performance.
[0010]
[Means for Solving the Problems]
(1) The tableware dryer pump according to the present invention is:A cleaning water suction port, a switching valve housing portion that communicates with the suction port via an impeller, a cleaning water discharge port that is provided on the peripheral wall and communicates with the switching valve housing portion, and is adjacent to the cleaning water discharge port on the peripheral wall The sewage discharge port provided and communicated with the switching valve housing portion, and housed in the switching valve housing portion andIt has a switching valve that opens either the washing water discharge port or the sewage discharge port in accordance with forward rotation or reverse rotation of the impeller, and the switching valve has an opening on one side and on the other side. A hollow valve body provided with a spherical portion and formed in a substantially U-shaped cross-section, in which air is sealed from the opening and sealed with a lid, and a rotating shaft on one side and a rotation valve on one side, A rectangular frame-shaped valve plate that is formed integrally with the valve body so as to surround the center portion, and the opening of the valve body is positioned on the washing water discharge port side and the spherical portion is positioned on the sewage discharge port side And let the rotation axis of the valve plateSaidArranged in the switch valve housing for rotationThe switching valve has no sliding portion due to the buoyancy of the hollow valve body, and the switching valve is rotated in a horizontal plane around the rotation axis by the pressure of the washing water by the impeller using the buoyancy.It is what I did.
[0011]
(3) Switching valve of (1) or (2) aboveInstead of the valve bodyIt was formed of a solid material having a specific gravity smaller than 1.
[0012]
(4) Above (1)-(3A primary dynamic pressure receiving surface for receiving water pressure during forward rotation of the impeller is formed on the washing water flow channel side of any one of the switching valves.
(5) Above (1)-(3)ofsquareThe frame-shaped valve plate formed a primary dynamic pressure receiving surface and a secondary dynamic pressure receiving surface that receive water pressure during forward rotation or reverse rotation of the impeller.
(6) Above (1)-(5) Was always urged toward the sewage discharge port by a spring.
[0013]
(7) Openings of the washing water discharge port and the sewage discharge port of the dishwasher pump of (1) are formed in a circular shape, and the valve body of the switching valve is in line contact with the opening.
(8)the above(7A plate-like or annular elastic seat having a circular opening is attached to the opening of the sewage discharge port.
(9)the above(8The inner diameter of the opening of the elastic seat body is set to 70 to 90% of the inner diameter of the opening of the sewage discharge port..
[0014]
(10) A substantially triangular rectifier is provided between the impeller and the changeover valve of (1), and the impeller side wall surface corresponding to the rotation trajectory of the impeller is provided on the impeller side of the rectifier. The washing water side wall surface on the side, and the switching valve side corresponding to the rotation trajectory of the switching valve on the switching valve side
A wall was formed.
[0015]
(11) Above (1) or (10) Is provided between the impeller and the change-over valve, and a rectifying plate is extended from the top of the rectifying stand on the sewage flow channel side in accordance with the rotational trajectory of the impeller. A sewage water inlet is formed between the tip and the inner surface of the peripheral wall, and a cleaning water inlet is formed between the intersection of the impeller side wall surface and the cleaning water side wall surface of the rectifier and the inner surface of the peripheral wall. Was formed smaller than the washing water inlet.
[0016]
(12)the above(10Or11) And the switching water side wall surface of the rectifying stand and the switching valve side wall surface are positioned closer to the cleaning water flow channel side than the primary dynamic pressure receiving surface when the switching valve closes the opening of the cleaning water discharge port, The top of the switching valve side wall surface was positioned closer to the sewage flow channel than the primary dynamic pressure receiving surface when the switching valve closed the sewage discharge port.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
1 is a front view of a dishwasher pump according to Embodiment 1 of the present invention, a part of which is shown in cross section, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a right side view of the casing of FIG. 4 is an exploded perspective view of FIG. 1, and FIG. 5 is a cross-sectional view taken along the line AA of FIG. 3. The dishwasher pump of the present invention includes a pump body 1 and a motor 15. Hereinafter, the present embodiment will be described in detail with reference to the drawings.
[0018]
In the pump body 1, reference numeral 2 denotes a base, which is composed of a substantially circular impeller mounting portion 3 and a substantially trapezoidal water channel portion 4 continuous therewith. A cylindrical portion 5 is provided in a protruding manner. A partition wall 6 having a through hole 7 at the center is provided slightly above the center of the cylindrical portion 5, and a recess 8 into which an impeller boss (described later) is inserted is formed above the partition wall 6. The recess 8 is provided with a mechanical seal 8a. Reference numeral 9 denotes a round hole which is provided at one corner of the water channel portion 4 and into which a rotating shaft of a switching valve described later is rotatably inserted. 2a is a plurality of screw insertion holes provided on the outer periphery of the base 2, and 2b is also a screw hole.
[0019]
Reference numeral 10 denotes an impeller in which a plurality of blades 12 are provided on a disk 11. A boss 13 is provided at the center of the lower surface of the disk 11, and the boss 13 is arranged in a recess 8 provided in the base 2. It is loosely fitted in the central hole of the provided mechanical seal 8 a and protrudes downward from the through hole 7 provided in the partition wall 6.
The output shaft 16 is connected to the boss 13 of the impeller 10. In addition, 17 is a bearing cover, 18 is a screw hole provided corresponding to the screw insertion hole 2a provided in the base 2. FIG.
[0020]
Reference numeral 20 denotes a casing which is formed in substantially the same plane shape as the base 2 and is integrally coupled to the base 2 by screws. The casing 20 includes a top plate 21 and a peripheral wall 22 and is located above the impeller mounting portion 3 of the base 2. An impeller accommodating portion 23 is formed, and a switching valve accommodating portion 24 is provided continuously therewith. Reference numeral 25 denotes a cleaning water suction port protruding from the top plate 21 immediately above the concave portion 8 of the base 2.
[0021]
A washing water discharge port 26 projects outwardly from the peripheral wall 22 of the switching valve housing portion 24 and communicates with the switching valve housing portion 24 through a circular opening 27 provided in the peripheral wall 22.
28 is a sewage discharge port that protrudes outward from the peripheral wall 22 in the vicinity of the cleaning water discharge port 26, and communicates with the switching valve housing portion 24 through a circular opening 29 provided in the peripheral wall 22. Reference numeral 29 a denotes U-grooves provided below and on both sides of the opening 29.
[0022]
Reference numeral 30 denotes a rectangular elastic seat mounted on the switching valve storage portion 24 side of the opening 29 of the sewage discharge port 28. The elastic seat 30 has an opening 31 in the center, and the switching valve is accommodated at the periphery of the opening 31. For example, a tulip-shaped lip 32 protruding toward the portion 24 is provided. The diameter of the opening 31 is smaller than the inner diameter of the sewage discharge port 28 (for example, 70 to 90%) in order to reduce the return of drainage due to static pressure. The shape of the elastic seat 30 is not limited to a square shape, and may be another shape such as a donut shape or a ring shape. In some cases, the elastic valve body 30 may be omitted.
[0023]
35 is a plane substantially triangular rectifier formed on the side of the impeller accommodating portion 23 of the switching valve accommodating portion 24 at substantially the same height as the peripheral wall 22, and corresponds to the rotation locus of the impeller 10 on the impeller 10 side. An arc-shaped impeller side wall surface 36 is formed, and a cleaning water side wall surface 37 is formed on the cleaning water flow channel 40 side along the peripheral wall 22 and at a predetermined interval. In addition, a switching valve side wall surface 38 is formed on the switching valve housing portion 24 side along a turning locus of a switching valve described later. In this case, it is desirable that the gap between the switching valve and the switching unit side wall surface 38 be about 1 to 3 mm in order to prevent intrusion of residues and the like.
[0024]
39 is a round hole provided facing the round hole 9 of the base 2, 40 is a washing water flow channel formed between the circumferential wall 22 and the washing water side wall surface 37 of the rectifying table 35, and 41 is a rectification with the circumferential wall 22. This is a sewage flow channel formed between the switching valve side wall surface 38 of the table 35. Reference numeral 20 a denotes a plurality of screw insertion holes provided on the outer periphery of the casing 20.
[0025]
Reference numeral 50 denotes a switching valve having a substantially U-shaped cross-section accommodated in the switching valve accommodating portion 24. As shown in FIG. 6, the vertical and horizontal 4 of the hollow spherical valve body 51 made of an elastic material having a Shore hardness of 60 to 80, for example. Flat surfaces 51a, 51b, 51c, 51d (51d not shown) with the surfaces cut off, a spherical portion 52 on the side orthogonal to the flat surfaces 51a to 51d, and a spherical portion 53 around the opposite side of the spherical portion 52 Of the valve body 51, a rectangular frame-shaped valve plate 56 integrally formed with the valve body 51 surrounding the substantially central portion of the outer periphery of the valve body 51, and one of the valve plates 56. It consists of a rotating shaft 57 provided on the side. The valve plate 56 may be formed separately from the valve body 51 and attached to the valve body 51 with an adhesive or the like. A primary dynamic pressure receiving surface 58 is formed by the valve plate 56 opposite to the rotating shaft 57, and a secondary dynamic pressure receiving surface 59 is formed by the upper and lower valve plates 56. In this case, a part of the valve body 51 may be excised to form a primary dynamic pressure receiving surface, and the valve body 51 may be formed of an inelastic body. In addition, the opening part 54 is obstruct | occluded with the cover body 55 in the state which enclosed air inside, and buoyancy is provided.
[0026]
The switching valve 50 is disposed in the switching valve accommodating portion 24 with the spherical portion 52 positioned on the sewage flow channel 41 side, and the rotating shaft 57 is rotatable in round holes 9 and 39 provided in the base 2 and the casing 20. It is inserted and supported. The round holes 9 and 39 have different depths for facilitating the mounting of the rotary shaft 57, and the inner diameter thereof is such that the rotary shaft 57 can freely rotate.
In this case, the intersection 35 a between the washing water side wall surface 37 and the switching valve side wall surface 38 of the rectifying table 35 is a primary dynamic pressure receiving surface 58 when the switching valve 50 closes the opening 27 of the washing water discharge port 26. Further, the top portion 35b of the switching valve side wall surface 38 is located closer to the washing water flow channel 40 side, and the sewage flow channel 41 than the primary dynamic pressure receiving surface 58 when the switching valve 50 closes the opening 29 of the sewage discharge port 28. Located on the side.
[0027]
Next, an example of the assembly procedure of the dishwasher pump configured as described above will be described.
First, the cylindrical portion 5 of the base 2 is fitted into the bearing cover 17 of the motor 15, and the screw inserted through the screw insertion hole 2 a is screwed into the screw hole 18 of the motor 15, and both are integrally coupled. Next, a mechanical seal 8 a is press-fitted into the recess 8 of the base 2. Then, the boss 13 of the impeller 10 is loosely fitted into the hole of the mechanical seal 8 a, and the tip portion is coupled to the output shaft 16 of the motor 15. Thereby, the impeller 10 is rotatably connected to the motor 15.
[0028]
Next, the elastic seat body 30 is press-fitted into U-grooves 29 a provided below and on both sides of the opening 29 of the drainage discharge port 28 with the lip 32 directed toward the switching valve housing portion 24. Thereby, the elastic seat 30 is fixed to the opening 29 of the drain discharge port 28 by being crimped to the peripheral wall. Instead of press-fitting into the U groove 29a, it may be fixed with a screw or the like. Next, the switching valve 50 is accommodated in the switching valve accommodating portion 24, and the lower portion of the rotating shaft 57 is loosely fitted in the round hole 9 provided in the base 2.
[0029]
Next, the casing 20 is fitted to the upper surface of the base 2, and the screw inserted through the screw insertion hole 20 a is screwed into the screw hole 2 b of the base 2, so that both are integrally coupled. At this time, the upper part of the rotating shaft 57 of the switching valve 50 is fitted into a round hole 39 provided in the casing 20, and the switching valve 50 is rotatably supported in the switching valve housing portion 24.
[0030]
Next, the operation of the present embodiment will be described mainly with reference to FIGS.
When the motor 15 is energized and driven in the state of FIG. 5 and the impeller 10 is rotated in the direction of arrow A (hereinafter referred to as normal rotation), the wash water sucked from the suction port 25 is the rotational energy of the impeller 10. Is pressure-fed from the washing water discharge port 26, and is sent to the spray nozzle to spray the wash water to wash dishes and the like.
[0031]
At this time, the switching valve 50 receives the dynamic pressure of the washing water on the primary dynamic pressure receiving surface 58 and the secondary dynamic pressure receiving surface 59 in addition to the buoyancy from itself, and moves toward the sewage flow channel 41 side around the rotating shaft 57. The spherical portion 52 is rotated and pressure-bonded to the elastic seat 30, and is in close contact with the lip 32 to close the opening 29 of the sewage discharge portion 28. Thereby, leakage of the cleaning water from the sewage discharge port 28 is reliably prevented during cleaning, and the cleaning water can be pumped only from the cleaning water discharge port 26. In addition, since the switching valve 50 has buoyancy, there is almost no resistance when rotating.
[0032]
Next, when the motor 15 is rotated in the opposite direction, as shown in FIG. 7, the impeller 10 rotates in the direction of arrow B (hereinafter referred to as reverse rotation), and the sewage sucked from the suction port 25 is impeller 10. Rotational energy causes a violent collision with the switching valve 50 via the sewage flow channel 41, receiving water pressure at the primary dynamic pressure receiving surface 58 and the secondary dynamic pressure receiving surface 59, and the switching valve 50 around the rotating shaft 57 as a washing water flow channel. Turn to 40 side. As a result, the spherical portion 53 around the opening 54 of the switching valve 50 is brought into pressure contact with the outer periphery of the opening 27 of the cleaning water discharge port 26 to close the opening 27. At the same time, the opening 31 of the elastic seat 30 provided in the opening 29 of the sewage discharge port 28 is opened, and the sewage flows out from the sewage discharge port 28 and is discharged to the outside.
[0033]
As described above, in the present embodiment, the switching valve 50 has no sliding portion, uses buoyancy, rotates around the rotation shaft 57 by the water pressure of the cleaning water by the impeller 50, and the cleaning water discharge port. Since the opening 27 of the sewage 26 or the opening 31 of the elastic seat 30 of the sewage discharge port 28 is in line contact with the opening 31, the opening and closing of the openings 27, 31 is not hindered by residues or the like. Therefore, the opening 27 or 31 can be reliably closed, so that it is possible to prevent washing water such as tableware from leaking out from the sewage discharge port 28.
[0034]
[Embodiment 2]
FIG. 8 is a plan sectional view of Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
In the present embodiment, a rectifying plate 35d is extended from the top of the rectifying table 35 on the sewage flow channel 41 side in correspondence with the rotation trajectory of the impeller 10, and the sewage flow is between the tip and the inner surface of the peripheral wall 22. The inlet 41a is formed. 40a is a washing water inlet formed between the intersection 35c of the impeller side wall surface 36 and the washing water side wall surface 37 of the rectifier 35 and the inner surface of the peripheral wall 22, and the opening area of the sewage inlet 41a is the washing water inlet. It is formed in a size of about 10% of the opening area of 40a.
[0035]
In the first embodiment described above, since the opening formed by the top of the wall surface on the sewage flow channel 41 side of the rectifier 35 and the inner surface of the peripheral wall 22 is large, the cleaning water is discharged when the impeller 10 rotates forward. During delivery to the outlet 26, the washing water from the impeller 10 may leak from the opening to the sewage water flow path 41 side, press and move the switching valve 50, and flow from the sewage discharge port 28.
In this embodiment, since the rectifying plate 35d is provided on the rectifying base 35 and the sewage inlet 41a is formed narrowly, the switching valve 50 moves because there is very little leakage from the sewage inlet 41a when the impeller 10 rotates forward. There is no possibility that the washing water flows out from the sewage discharge port 28.
[0036]
[Embodiment 3]
By the way, in the dishwasher pump as in the first and second embodiments, when the rotation of the motor 15 is stopped, the wash water that has just flown out of the wash water discharge port 26 may flow backward. 50 is shaken and the sealing performance of the switching valve 50 is impaired. As a result, the cleaning water may temporarily leak from the sewage discharge port 28.
In the present embodiment, in order to cope with such a problem, the switching valve 50 is urged so as to be always pressed against the elastic seat 30 of the sewage discharge port 28 by a spring.
[0037]
That is, as shown in FIG. 9, a spring 60 such as a twist spring is attached to the rotating shaft 57 of the switching valve 50, one end of which is locked to the valve plate 56 of the switching valve 50, and the other end is fixed to the casing 20, for example. The switching valve 50 is always urged toward the elastic seat 30 side of the sewage discharge port 28. As a result, the spherical portion 52 of the switching valve 50 is constantly pressed against the lip 32 of the elastic seat 30 and closes the opening 31.
[0038]
In the present embodiment configured as described above, the switching valve 50 is normally urged by the spring 60 to close the opening 31 of the elastic seat 30 of the sewage discharge port 28, and the cleaning water discharge port. The opening part 27 of 26 is open | released. Therefore, during the forward rotation of the impeller 10, all of the cleaning water sucked from the suction port 25 is pumped from the cleaning water discharge port 26 to the spray nozzle and is not drained from the dirty water discharge port 28.
[0039]
When the impeller 10 is reversed, as shown in FIG. 10, the switching valve 50 rotates against the spring 60 by the water pressure of the sewage, closes the opening 27 of the cleaning water discharge port 26, and the sewage discharge port The opening 31 of the 28 elastic seats 30 is opened, and the sewage is discharged from the sewage discharge port 28. When the motor 15 is stopped, the switching valve 50 closes the opening 31 of the elastic seat 30 again by the urging force of the spring 60.
[0040]
Thus, in the present embodiment, when the motor 15 is stopped, the switching valve 50 automatically closes the opening 31 of the elastic seat 30 of the sewage discharge port 28, so that the cleaning water is supplied from the cleaning water discharge port 26. Even if it flows backward, the switching valve 50 does not shake, the sealing performance is ensured, and the washing water does not flow out from the sewage discharge port 28.
Note that this embodiment can also be implemented in later-described fourth and fifth embodiments.
[0041]
[Embodiment 4]
FIG. 11 is a sectional view of the fourth embodiment of the present invention. In the present embodiment, the switching valve 50a is formed hollow by blow molding with substantially the same outer shape as the switching valve 50 described above, and has buoyancy.
The operation and effect of the switching valve 50a according to the present embodiment are the same as those in the first embodiment.
[0042]
[Embodiment 5]
FIG. 12 is a sectional view of the fifth embodiment of the present invention. In the present embodiment, the switching valve 50b is made of a material having a specific gravity smaller than 1 and is substantially solid with the same outer shape as the switching valve 50 described above, and has buoyancy.
Although the operation and effect of the switching valve 50b according to the present embodiment are substantially the same as those of the first embodiment, the switching valve 50b can be manufactured by injection molding, so that the cost can be reduced.
[0043]
【The invention's effect】
(1) A dishwasher pump according to the present invention comprises:A cleaning water suction port, a switching valve housing portion that communicates with the suction port via an impeller, a cleaning water discharge port that is provided on the peripheral wall and communicates with the switching valve housing portion, and is adjacent to the cleaning water discharge port on the peripheral wall The sewage discharge port provided and communicated with the switching valve housing portion, and housed in the switching valve housing portion andIt has a switching valve that opens either the washing water discharge port or the sewage discharge port in accordance with forward rotation or reverse rotation of the impeller, and the switching valve has an opening on one side and on the other side. A hollow valve body provided with a spherical portion and formed in a substantially U-shaped cross-section, in which air is sealed from the opening and sealed with a lid, and a rotating shaft on one side and a rotation valve on one side, A rectangular frame-shaped valve plate that is formed integrally with the valve body so as to surround the center portion, and the opening of the valve body is positioned on the washing water discharge port side and the spherical portion is positioned on the sewage discharge port side And let the rotation axis of the valve plateSaidArranged in the switch valve housing for rotationThe switching valve has no sliding portion due to the buoyancy of the hollow valve body, and the switching valve is rotated in a horizontal plane around the rotation axis by the water pressure of the washing water by the impeller using the buoyancy.Since the cleaning water or sewage pumped by the impeller rotates the switching valve, the spherical portion is pressed against the opening of the cleaning water discharge port or the sewage discharge port, and is in contact with the opening to block the line. Therefore, a great sealing effect can be obtained, and the cleaning water does not leak from the sewage discharge port during the cleaning of tableware or the like.
[0044]
(2) Since the valve body of the switching valve of (1) is formed of an elastic material, the contact with the cleaning water discharge port or the opening of the sewage discharge port becomes better, and the leakage prevention effect is increased.
[0045]
(3) (1) or (2) aboveInstead of the valve body of (1) aboveSince the switch is made of solid material with a specific gravity of less than 1 to give buoyancy to the switching valve, the washing water is pressed against the opening of the sewage discharge port by the water pressure of the wash water during washing of dishes, etc. Will not leak.
[0046]
(4) Above (1)-(3) To form a primary dynamic pressure receiving surface that receives part of the valve body and receives the water pressure during forward rotation of the impeller,
(5) Or the switching valvesquareSince the primary pressure receiving surface and the secondary dynamic pressure receiving surface that receive the water pressure when the impeller rotates forward or reverse are formed by the frame-shaped valve plate, the switching valve can be switched reliably.
[0047]
(6) Above (1)-(5) Is always urged in the direction of the sewage discharge port by a spring, so that the switching valve is surely pressed against the sewage discharge port by the water pressure of the wash water and the urging force of the spring during the cleaning of dishes, etc. In addition, even if the washing water is shaken when the impeller is stopped, the unstable operation of the switching valve can be prevented.
[0048]
(7) Since the openings of the washing water discharge port and the sewage discharge port of (1) are formed in a circular shape and the valve body of the switching valve is in line contact with the opening, the cleaning water discharge port and the sewage discharge port The sealing effect can be improved.
(8) Also, (7Since a plate-like or annular elastic seat having a circular opening is attached to the opening of the sewage discharge port, the sealing effect of the sewage discharge port by the switching valve can be further improved.
[0049]
(9)the above(8The diameter of the opening of the elastic seat is 70 to 90% of the diameter of the opening of the sewage discharge port, so the switching valve is made elastic by the difference in static pressure between the sewage flow path side and the sewage discharge side. The pressing force increases, and the sealing effect can be further enhanced.
[0050]
(10) A substantially triangular rectifier is provided between the impeller and the switching valve in (1) above, and the impeller side wall surface corresponding to the rotational trajectory of the impeller is provided on the impeller side of the rectifier. The washing water side wall surface is formed on the side and the switching valve side wall surface corresponding to the rotation trajectory of the switching valve is formed on the switching valve side, so that a dishwasher pump having high water supply efficiency and reliable switching valve operation is obtained. be able to.
[0051]
(11) Above (1) or (10) Is provided between the impeller and the changeover valve, and a rectifying plate is extended from the top of the rectifying stand on the sewage flow channel side in accordance with the rotational trajectory of the impeller. A sewage inlet is formed between the tip and the inner surface of the peripheral wall, and a cleaning water inlet is formed between the intersection of the impeller side wall surface and the cleaning water side wall surface of the rectifier and the inner surface of the peripheral wall, thereby cleaning the sewage inlet. Since it was formed smaller than the water inlet, it is possible to prevent the washing water from flowing out from the sewage discharge port during the forward rotation of the impeller.
[0052]
(12)the above(10Or11) And the switching water side wall surface of the rectifying stand and the switching valve side wall surface are positioned closer to the cleaning water flow channel side than the primary dynamic pressure receiving surface when the switching valve closes the opening of the cleaning water discharge port, Since the top portion of the switching valve side wall surface is positioned on the sewage flow channel side from the primary dynamic pressure receiving surface when the switching valve closes the sewage discharge port, the washing water or sewage is being washed during cleaning of dishes, etc. or when draining sewage The water pressure effectively acts on the dynamic pressure receiving surface or the valve body, so that the switching valve can be reliably sealed and switched.
[Brief description of the drawings]
FIG. 1 is a front view of a first embodiment of the present invention partially shown in cross section.
FIG. 2 is a plan view of FIG.
FIG. 3 is a side view of the casing of FIG. 2;
4 is an exploded perspective view of FIG. 1. FIG.
FIG. 5 is a cross-sectional plan view showing a main part of the present embodiment.
6 is a front perspective view and a rear perspective view of the switching valve of FIG. 4. FIG.
FIG. 7 is an operation explanatory diagram of the present embodiment.
FIG. 8 is a plan view of a main part of the second embodiment.
FIG. 9 is a cross-sectional plan view of a third embodiment.
FIG. 10 is an operation explanatory diagram of the present embodiment.
FIG. 11 is a plan sectional view showing a main part of the fourth embodiment.
12 is a plan sectional view showing the main part of the fifth embodiment. FIG.
FIG. 13 is an explanatory diagram of an example of a conventional dishwasher.
14 is a longitudinal sectional view of the pump of FIG.
15 is a cross-sectional plan view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump main body, 2 bases, 5 cylindrical part, 10 impeller, 15 motor, 20 casing, 23 impeller accommodating part, 24 switching valve accommodating part, 25 washing water intake port, 26 washing water discharge port, 27, 29 Opening, 28 Sewage outlet, 30 Elastic seat, 31 Opening, 32 Lip, 35 Rectifier, 35d Rectifier plate, 36 Impeller side wall, 37 Washing water side wall, 38 Switching valve side wall, 40 Washing water flow channel , 41 Sewage flow channel, 50, 50a, 50b Switching valve, 51 Valve body, 52, 53 Spherical part, 54 Opening part, 55 Cover body, 56 Valve plate, 57 Rotating shaft, 58 Primary dynamic pressure receiving surface, 59 Secondary Dynamic pressure receiving surface, 60 springs.

Claims

洗浄水の吸込口、羽根車を介して前記吸込口に連通する切換弁収容部、周壁に設けられ前記切換弁収容部に連通する洗浄水吐出口、該洗浄水吐出口に近接して周壁に設けられ前記切換弁収容部に連通する汚水吐出口、及び前記切換弁収容部に収容され前記羽根車の正転又は逆転に応じて前記洗浄水吐出口又は汚水吐出口のいずれか一方を開口する切換弁を有し、
該切換弁を、一方の側に開口部を有し他方の側に球状部が設けられて断面ほぼＵ字状に形成され前記開口部から空気が封入されて蓋体で密封された中空の弁体と、一方の側に回転軸を有し前記弁体外周のほぼ中央部を囲繞して該弁体と一体に形成された四角枠状の弁板とによって構成し、前記弁体の開口部を前記洗浄水吐出口側に球状部を前記汚水吐出口側に位置させて、前記弁板の回転軸により前記切換弁収容部に回転自在に配置し、
前記切換弁は前記中空の弁体の浮力により摺動部がなく、前記切換弁を、前記浮力を利用し、前記羽根車による洗浄水の水圧により回転軸を中心に水平面内で回動させることを特徴とする食器洗浄機用ポンプ。 A cleaning water suction port, a switching valve housing portion that communicates with the suction port via an impeller, a cleaning water discharge port that is provided on the peripheral wall and communicates with the switching valve housing portion, and is adjacent to the cleaning water discharge port on the peripheral wall A sewage discharge port that is provided and communicates with the switching valve housing portion, and opens either the washing water discharge port or the sewage discharge port that is housed in the switching valve housing portion and is forwardly or reversely rotated by the impeller. Having a switching valve,
The switching valve is a hollow valve which has an opening on one side and a spherical portion on the other side, is formed in a substantially U-shaped cross-section and is sealed with a lid by air sealed from the opening. And a rectangular frame-shaped valve plate integrally formed with the valve body, having a rotating shaft on one side and surrounding a substantially central portion of the outer periphery of the valve body, and an opening of the valve body the by the spherical portion is located in the sewage discharge port side to the washing water discharge port side, rotatably arranged on the selector valve housing portion by the rotation shaft of the valve plate,
The switching valve has no sliding portion due to the buoyancy of the hollow valve body, and the switching valve is rotated in a horizontal plane around the rotation axis by the water pressure of the washing water by the impeller using the buoyancy. dishwasher pump according to claim.

前記切換弁の弁体を弾性材で形成したことを特徴とする請求項１記載の食器洗浄機用ポンプ。 2. The dishwasher pump according to claim 1, wherein the valve body of the switching valve is made of an elastic material.

前記切換弁の弁体を、前記弁体に代えて比重が１より小さい材料により中実に形成したことを特徴とする請求項１又は２記載の食器洗浄機用ポンプ。3. The dishwasher pump according to claim 1 , wherein the valve body of the switching valve is made of a solid material having a specific gravity smaller than 1 instead of the valve body .

前記切換弁の洗浄水流水路側に、弁体の一部を切除して羽根車の正転時に水圧を受圧する一次動圧受圧面を形成したことを特徴とする請求項１〜３の何れかに記載の食器洗浄機用ポンプ。 4. A primary dynamic pressure receiving surface for receiving a water pressure during forward rotation of the impeller by forming a part of the valve body on the washing water flow channel side of the switching valve . A dishwasher pump as described in 1.

前記切換弁の四角枠状の弁板により羽根車の正転時又は逆転時に水圧を受圧する一次動圧受圧面及び二次動圧受圧面を形成したことを特徴とする請求項１〜３の何れかに記載の食器洗浄機用ポンプ。 Of claim 1 to 3, characterized in that the formation of the primary dynamic pressure receiving surfaces and secondary dynamic pressure receiving surfaces for receiving the water pressure during the forward or during the reverse rotation of the impeller by a rectangular frame-like valve plate of the switching valve The dishwasher pump according to any one of the above.

前記切換弁をばねにより常時汚水吐出口方向に付勢したことを特徴とする請求項１〜５の何れかに記載の食器洗浄機用ポンプ。The dishwasher pump according to any one of claims 1 to 5 , wherein the switching valve is always urged by a spring toward the sewage discharge port .

前記洗浄水吐出口及び汚水吐出口の開口部を円形に形成し、該開口部に切換弁の弁体を線接触させるように構成したことを特徴とする請求項１記載の食器洗浄機用ポンプ。 2. The dishwasher pump according to claim 1, wherein openings for the washing water discharge port and the sewage discharge port are formed in a circular shape, and the valve body of the switching valve is in line contact with the opening. .

前記汚水吐出口の開口部に、円形の開口部を有する板状又は環状の弾性座体を取付けたことを特徴とする請求項７記載の食器洗浄機用ポンプ。 8. The dishwasher pump according to claim 7 , wherein a plate-like or annular elastic seat having a circular opening is attached to the opening of the sewage discharge port .

前記弾性座体の開口部の内径を、汚水吐出口の開口部の内径の７０〜９０％の大きさとしたことを特徴とする請求項８記載の食器洗浄機用ポンプ。 9. The dishwasher pump according to claim 8, wherein the inner diameter of the opening of the elastic seat is 70 to 90% of the inner diameter of the opening of the sewage discharge port .

羽根車と切換弁との間にほぼ三角形状の整流台を設け、該整流台の羽根車側に該羽根車の回転軌跡に対応した羽根車側壁面を、洗浄水流水路側に洗浄水側壁面を、また切換弁側に該切換弁の回転軌跡に対応した切換弁側壁面を形成したことを特徴とする請求項１記載の食器洗浄機用ポンプ。 A substantially triangular rectifier is provided between the impeller and the switching valve, the impeller side wall surface corresponding to the rotation trajectory of the impeller on the impeller side of the rectifier, and the wash water side wall surface on the side of the washing water flow channel and also dishwasher pump of claim 1, wherein the forming the switching valve side wall corresponding to the rotational locus of the switching valve to the selector valve side.

羽根車と切換弁との間にほぼ三角形状の整流台を設け、該整流台の汚水流水路側の頂部から羽根車の回転軌跡に対応して整流板を延設し、該整流板の先端部と周壁内面との間に汚水流水入口を形成すると共に、前記整流台の羽根車側壁面と洗浄水側壁面の交点と周壁内面との間に洗浄水流入口を形成し、前記汚水流入口を洗浄水流入口より小さく形成したことを特徴とする請求項１又は１０記載の食器洗浄機用ポンプ。 A substantially triangular rectifier is provided between the impeller and the switching valve, and a rectifier is extended from the top of the rectifier on the sewage flow channel side in accordance with the rotational trajectory of the impeller, and the tip of the rectifier A sewage inlet is formed between the inner wall and the inner surface of the peripheral wall, and a cleaning water inlet is formed between the intersection of the impeller side wall surface and the cleaning water side wall surface of the rectifier and the inner surface of the peripheral wall, thereby cleaning the sewage inlet. The dishwasher pump according to claim 1 or 10 , wherein the dishwasher pump is smaller than the water inlet .

前記整流台の洗浄水側壁面と切換弁側壁面との交点を、切換弁が洗浄水吐出口の開口部を閉塞したときの一次動圧受圧面より洗浄水流水路側に位置させると共に、前記切換弁側壁面の頂部を、前記切換弁が汚水吐出口を閉塞したときの一次動圧受圧面より汚水流水路側に位置させたことを特徴とする請求項１０又は１１記載の食器洗浄機用ポンプ。 The intersection of the washing water side wall surface and the switching valve side wall surface of the rectifying stand is positioned on the washing water flow channel side from the primary dynamic pressure receiving surface when the switching valve closes the opening of the washing water discharge port, and the switching 12. The dishwasher pump according to claim 10 or 11 , wherein the top of the valve side wall is positioned closer to the sewage flow path than the primary dynamic pressure receiving surface when the switching valve closes the sewage discharge port .