JP3874561B2

JP3874561B2 - Drainage pump

Info

Publication number: JP3874561B2
Application number: JP01809799A
Authority: JP
Inventors: 達志二宮; 正幸今井
Original assignee: Fujikoki Corp
Current assignee: Fujikoki Corp
Priority date: 1999-01-27
Filing date: 1999-01-27
Publication date: 2007-01-31
Anticipated expiration: 2019-01-27
Also published as: JP2000213770A

Description

【０００１】
【発明の属する技術分野】
本発明は排水ポンプ、特に空調機に装備される排水ポンプに関する。
【０００２】
【従来の技術】
空調機の室内ユニットは、冷房運転時に熱交換器に空気中の水分が凝縮して付着し、熱交換器の下方に設けられるドレンバン内に滴下する。このドレンバン内に溜ったドレン水を排水するために排水ポンプが装備される。この排水ポンプに関しては、従来各種のものが提案されており、この種のポンプとして次のものがある。即ち、下部に吸込口を形成し、上部を開口すると共に、側方に吐出口を設けたハウジング内に羽根を回転自在に設け、この羽根をハウジングの開口の上部にカバーを介して固定したモータにより回転させている。そのモータの回転軸は、カバーを回転自在に貫通して羽根の軸部に連結され、上記カバーには大気とハウジングとを連通する貫通穴が設けられている。これにより、モータを駆動して、羽根が回転すると、ドレンバン内に貯溜したドレン水は、吸込口の羽根の下端から吸込まれ、ハウジング内面に沿って揚水され、ケーシングの吐出口から外部に吐出される。
【０００３】
この種、排水ポンプに用いられている羽根の構成として、特開平９−６８１８５号公報に開示されているものがある。即ち、図１３は、従来の排水ポンプの全体構成を示す一部を断面とした正面図である。全体を符号１で示す排水ポンプは、モータ１０と、モータ１０に対して下方にブラケット２０を介してとりつけられるポンプ本体３０とを有する。ブラケット２０は、ポンプハウジングの上部部材であるカバー３２と一体に形成され、カバー３２はシール部材３４を介してハウジング４０に連結される。ハウジング４０は、プラスチックでつくられるもので、吸込口４２、ポンプ室４４、吐出口４６を有する。
【０００４】
ハウジング４０内に装備される回転羽根５０は、軸部５２と、軸部５２の中心軸を中心として径方向へ突出する複数の平板からなる小径羽根５４を有する。図では４枚の小径羽根５４を有する。軸部５２は、カバー３２の中央に形成される貫通穴３６を通ってモータ１０側へ突出し、軸部５２に設けた穴にモータ１０の駆動軸１２が挿入される。軸部５２の上面には水切円板１４をとりつけて、カバー３２の貫通穴３６から噴出するドレン水がモータ１０側へ飛散するのを防止する。
【０００５】
回転羽根５０の小径羽根５４は、ハウジング４０のパイプ状の吸込口４２内に挿入される。吸込口４２の吸込端部４３は、開口端に向かって内径寸法が絞られるテーパ面に形成されており、小径羽根５４の先端部も先細りのテーパ面５６に形成されている。ハウジング４０のポンプ室４４内には回転羽根５０の大径羽根６０が収容される。
【０００６】
図１４は回転羽根５０の側面図、図１５は図１４のＢ部の詳細図、図１６は回転羽根５０の上面図、図１７（Ａ），（Ｂ）及び（Ｃ）は、それぞれ図１５のＡ−Ａ断面図、Ｂ−Ｂ断面及びＣ−Ｃ断面の一部を示す図である。
【０００７】
回転羽根５０は軸部５２と、軸部５２の外周部から放射状に外方へ延びる平板状の大径羽根６０とを備え、大径羽根６０の下縁部はテーパ状に形成され、この下縁部は中空部６３を有する円盤状の環状部材６２で連結される。大径羽根６０の下方には小径羽根５４が設けられる。大径羽根６０及び小径羽根５４は樹脂により一体的に構成され、それぞれ４枚の平板であるが、その枚数は適宜に選択される。大径羽根６０の間には補助羽根６８が設けられる。この補助羽根６８によりポンプの揚程を高くすることができる。軸部５２の中心には、モータの駆動軸を挿入するための穴５３が設けてあり、また、小径羽根５４の先端部は先細りのテーパ面５６に形成される。このテーパ面５６の傾斜角は、例えば４５度に形成されている。
【０００８】
小径羽根５４は回転方向に対して円弧状の面取り部５７が形成される。この円弧状の面取り部５７は、小径羽根の厚さ寸法にほぼ等しい曲率半径を有し、この面取り部５７を設けることによって、吸込口４２内のドレン水の掻き混ぜによる騒音が減少し、小径羽根５４の回転によりドレン水はスムーズにポンプ室４４内に引き上げられる。
【０００９】
大径羽根６０と補助羽根６８の外周端は円筒状壁部材６４によって連結される。円筒状壁部材６４はその高さが大径羽根６０と補助羽根６８の上縁部の高さ寸法より低くして設けられている。さらに、円筒状壁部材６４の上縁部の内側には、円弧状の面取り部７０が形成されている。かかる円筒状壁部材６４によれば、大径羽根６０の回転により液体内から発生した気泡の流れが、吐出口４６へスムーズに流れ、気泡のカバー３２の底面３５への衝突が緩和され、騒音が減少すると共に排水ポンプが停止したときに、吐出口４６からケーシング内のポンプ室４４へ戻る水が円筒状壁部材６４に突き当たり、円筒状壁部材６４の緩衝により徐々に拡散され、戻り水に起因する騒音も低減されるのである。しかも、上記円弧状の面取り部７０は、例えば円筒状壁部材６４の板厚寸法にほぼ等しい曲率半径を有し、この円弧状の面取り部７０を設けることによって、大径羽根６０や補助羽根６８の回転によって半径方向に流れるエネルギーを付与されたドレン水は、円筒状壁部材６４の上縁部をスムーズに乗り越えて、低騒音化が実現できる。
【００１０】
円筒状壁部材６４の下端部は、大径羽根６０と補助羽根６８の下縁部を連結する環状部材６２に環状連結される。なお、図では、円筒状壁部材６４と環状部材６２とは一体的に構成されている場合を示しているが、それらを別体で構成してよいのは勿論である。この環状部材６２により、吸込口４２から上昇してくるドレン水の液面がほぼ上下に分断され、大径羽根に接する水の量が減少し、気泡の発生が減少することとなる。この環状部材６２の内周部側は回転羽根の中心部との間に開口部６３を有する。大径羽根６０と補助羽根６８の下縁部は小径羽根６４に向かって傾斜する形状に形成され、環状部材６２もこの傾斜に合わせて皿状に形成されている。
【００１１】
【発明が解決しようとする課題】
ところで、従来の排水ポンプの構成において、円筒状壁部材の上縁の高さが大径羽根の上縁の高さより低く形成されることにより騒音を低減することが可能となるが、騒音の低下をより効果的に発揮させることについては、格別の配慮がなされていなかった。
本発明は、このような点に鑑みてなされたものであって、その目的とするところは、円筒状壁部材の高さと吐出口との関係を定めることにより、騒音の低減を可能にする排水ポンプを提供することにある。
【００１２】
【課題を解決するための手段】
本発明者等は、円筒状壁部材の高さと吐出口の位置関係につき、騒音レベルを低く抑えるべく種々の研究を重ねた。その結果、両者の高さ寸法を所定の関係に設定すればいいことを見出すに至った。
【００１３】
しかして、本発明に係る排水ポンプは、モータの駆動軸に連結される回転羽根と、その下端部に吸込口を設けると共にその上部側方に吐出口を設けたモータの駆動軸に連結される回転羽根と、上記回転羽根を収容するハウジングとを有する排水ポンプにおいて、上記回転羽根は、モータの駆動軸に連結される軸部と、軸部から放射方向に設けられる複数の板状の大径羽根と、上記大径羽根の下部に軸方向に設けられる複数の板状の小径羽根と、上記大径羽根の下縁部を連結する中空部を有する円盤状の環状部材と、上記円盤状の環状部材の外縁部にあって上記大径羽根の外周縁を連結する円筒状壁部材とからなり、吐出口の中心から吐出口の上縁部までの高さ寸法に対して上記円筒状壁部材の上縁部までの高さ位置の比を６０％から１００％になる位置に形成したことを特徴としている。
【００１４】
また、本発明に係る排水ポンプの好ましい具体的態様としては、前記円筒状壁部材の内側には、補助羽根が円盤状の環状部材の上に立設されていることを特徴とする。
【００１５】
前述の如く構成された本発明に係る排水ポンプは、吐出口の中心から吐出口の上縁部までの高さ寸法に対して、円筒状壁部材の高さ寸法が６０％から１００％になる位置に配置したことにより、排出ポンプから生ずる騒音の効果的な低減が図れる。
【００１６】
【発明の実施の形態】
以下、図面により本発明による排水ポンプの実施の形態について説明する。なお、実施の形態を説明するに当って、従来例と同一の機能を奏する物は同一符号を付して説明し、また該実施の形態においては、モータは従来例と同一であるので、説明は省略し、ポンプ本体を構成する回転羽根の構成のみを示す。
図１は、ポンプ本体を構成する回転羽根の一実施形態の正面図、図２は図１の矢印Ｐ方向から見た上面図、図３は図２のＡ−Ａ断面図、図４は図２のＤ−Ｄ断面図、図５は図２のＧ−Ｇ断面図、図６は図４のＥ−Ｅ断面図、図７は図１のＦ部の詳細図、図８は図７のＨ−Ｈ断面図である。
【００１７】
回転羽根５０は、プラスチックを成形して作られるものであって、平板状の複数枚、例えば４枚の小径羽根４１０を有する。この小径羽根の上部はテーパ部４１１を介して複数枚、例えば４枚の大径羽根４５０に連結される。
【００１８】
大径羽根４５０の中心部には、円柱状の軸部４２０が設けてあり、軸部４２０は中心に有底の穴４３０を有する。この穴４３０にモータの出力軸（図示せず）を圧入して、モータの回転力を回転羽根５０に伝達する。
大径羽根４５０の下縁部は、円盤状の環状部材４６０で覆われる。この環状部材４６０の中心部には、開口部４６２が形成される。
【００１９】
円盤状の環状部材４６０の外周縁は、円筒状壁部材４７０に連結される。この壁部材４７０は、大径羽根４５０の外縁部を連結し、円筒状壁部材４７０の上縁部４７２は、大径羽根４５０の上縁部４５１より低く形成されるものである。
【００２０】
円筒状壁部材４７０の内側に４枚の補助大径羽根４５２が設けられる。補助羽根４５２は、４枚の大径羽根４５０の中間に配設され、円盤状の環状部材４６０の開口４６２の方向に延びて立設される。図６に示す実施形態では、その内径側の縁部４５４は、円盤状の環状部材４６０の開口部４６２の位置の近傍まで延びる形状を有する。
補助羽根４５２の上縁部４５３の高さ位置は、大径羽根４５０の上縁部４５１の高さ位置に合わせられると共に、大径羽根４５０の上縁部４５１及び補助羽根４５２の上縁部４５３は円筒状壁部材４７０の上縁部４７２より露出する。この露出した部分は、回転羽根の最大揚程を確保することに寄与する。また大径羽根と補助羽根はそのいずれかの上縁部のみが露出してもよい。
【００２１】
図７及び図８は、小径羽根４１０の下端部に形成されるテーパ部４１２と、小径羽根４１０の外縁部に形成される円弧状の面取り４１４の形状を示す。
本発明の排水ポンプに装備される回転体である羽根は、以上のような形状、構造を有し、軽量な回転体を構成する。したがって、振動、騒音の少ない揚水が達成できる。
【００２２】
図９は、排水ポンプのポンプ本体３０の一実施形態を示す正面図であり、図１〜図８に示す回転羽根５０を有し、吐出口４６の内径口の中心線に対して回転羽根５０の高さ位置を変化させたときに、排水ポンプの騒音・最大揚程の特性の変化を実験するのに用いたものであり、図１０は図９の矢印Ｙ方向から見た吐出口４６を示す図である。
吐出口４６の内径部は、ハウジング側の小径部４６ａから出口の大径部４６ｂまでテーパー状に流路が拡がる形状を有する。
小径部４６ａの直径寸法は５ｍｍに設定されているので、中心線から小径部４６ａの上縁までの距離Ｈ₁は２．５ｍｍとなる。
このＨ₁に対して、吐出口の中心線に対して回転羽根５０の高さ位置、具体的には円筒状壁部材４７０の上縁部４７２の高さ寸法Ｈ₂を変更して実験を行った。
【００２３】
図１１及び図１２は、図９に示すポンプ本体を用いたそれぞれ５０ヘルツ及び６０ヘルツの定格電圧のときの実験結果を表わし、寸法Ｈ₂を１．０ｍｍから３．５ｍｍまで０．５ｍｍ毎に変化させたときの横軸にＨ₂／Ｈ₁比を示し、縦軸に騒音（dB）と締切揚程（ｍｍ）を示す特性曲線である。
【００２４】
図１１において、図中×印で結ぶ曲線で表わされる締切揚程の性能を高く維持しつつ、騒音性能は、Ｈ₂／Ｈ₁比が１．５／２．５のときに、揚程７００ｍｍを共に保持するドレン水の吐出時（図中△印で結ぶ曲線で表わされる）及びドレン水の吐出終了時（図中□印で結ぶ曲線で表わされる）に低下し、この騒音性能はＨ₂／Ｈ₁比において２．０／２．５，２．５／２．５においても維持されるが、Ｈ₂／Ｈ₁比が２．５／２．５のときに締切揚程が低下する。
【００２５】
図１２においても、図１１と同様の締切揚程の性能と騒音性能が示される。即ち、Ｈ₂／Ｈ₁比が１．５／２．０のときに高い締切揚程（図中×印で結ぶ曲線で表わされる）を維持して、騒音性能は、揚程７００ｍｍを保持するドレン水の吐出時（図中△印で結ぶ曲線で表わされる）及びドレン水の吐出終了時（図中□印で結ぶ曲線で表わされる）共に低下し、この騒音性能は、Ｈ₂／Ｈ₁比において２．０／２．５，２．５／２．５においても維持されるが、締切揚程はＨ₂／Ｈ₁比が２．５／２．５において低下する。
【００２６】
したがって、図１１及び図１２の実験結果によりＨ₂／Ｈ₁比が１．５／２．５以上、２．５／２．５以下、すなわち、吐出口の半径寸法に対して、吐出口の中心線から回転羽根５０の円筒状壁部材４７０の上縁部までの高さ寸法を６０％以上１００％以下の範囲に設定することにより、締切揚程性能を損なうことなく、騒音の低減効果を得ることができるのである。
【００２７】
以上述べた実施の形態においては、回転羽根５０には補助羽根を形成する場合について述べたが、本発明は補助羽根を用いない場合にも適用できるのは勿論であり、また大径羽根あるいは補助羽根は、その上縁部が円筒状壁部材の上縁部に露出しない構成の場合にも適用できる。
【００２８】
【発明の効果】
以上の説明から理解されるように、本発明に係る排水ポンプは、回転羽根の円筒状壁部材の高さと吐出口との位置関係を適宜の範囲に設定したので、締切揚程を維持しつつ騒音を低減することができる。
また、従来の排水ポンプの外形及び主要構成部分を大幅に変更することがないので、安価に騒音低減可能な排水ポンプを製造できる。
【図面の簡単な説明】
【図１】本発明の排水ポンプの回転羽根の正面図。
【図２】本発明の排水ポンプの回転羽根の平面図。
【図３】図２のＡ−Ａ断面図。
【図４】図２のＢ−Ｂ断面図。
【図５】図２のＧ−Ｇ断面図。
【図６】図４のＥ−Ｅ断面図。
【図７】図１のＦ部の詳細図。
【図８】図７のＨ−Ｈ断面図。
【図９】本発明の回転羽根の寸法を示す説明図。
【図１０】本発明の効果を示す特性曲線図。
【図１１】本発明の効果を示す特性曲線図。
【図１２】本発明の効果を示す特性曲線図。
【図１３】従来の排水ポンプを一部断面して示す側面図。
【図１４】図１３の回転羽根の側面図。
【図１５】図１４のＢ部の詳細図。
【図１６】図１４の回転羽根の上面図。
【図１７】図１４及び図１６に示される回転羽根の説明用断面図。
【符号の説明】
５０回転羽根
４１０小径羽根
４５０大径羽根
４６０環状部材
４７０円筒状壁部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage pump, and more particularly to a drainage pump equipped in an air conditioner.
[0002]
[Prior art]
In the indoor unit of the air conditioner, moisture in the air condenses and adheres to the heat exchanger during cooling operation, and drops into a drain van provided below the heat exchanger. A drainage pump is provided to drain the drain water accumulated in the drain van. Various types of drainage pumps have been proposed in the past, and this type of pump includes the following. In other words, a motor in which a suction port is formed in the lower portion, an upper portion is opened, and a blade is rotatably provided in a housing provided with a discharge port on the side, and the blade is fixed to the upper portion of the housing opening via a cover. It is rotated by. The rotation shaft of the motor is rotatably connected to the shaft portion of the blade through the cover, and the cover is provided with a through hole for communicating the atmosphere with the housing. As a result, when the motor is driven to rotate the blade, the drain water stored in the drain van is sucked in from the lower end of the blade of the suction port, pumped up along the inner surface of the housing, and discharged from the discharge port of the casing to the outside. The
[0003]
As a configuration of blades used for this type of drainage pump, there is one disclosed in JP-A-9-68185. That is, FIG. 13 is a front view, partly in section, showing the overall configuration of a conventional drainage pump. The drainage pump indicated by reference numeral 1 as a whole has a motor 10 and a pump body 30 attached to the motor 10 via a bracket 20 below. The bracket 20 is formed integrally with a cover 32 that is an upper member of the pump housing, and the cover 32 is connected to the housing 40 via a seal member 34. The housing 40 is made of plastic and has a suction port 42, a pump chamber 44, and a discharge port 46.
[0004]
The rotary blade 50 provided in the housing 40 includes a shaft portion 52 and a small-diameter blade 54 formed of a plurality of flat plates protruding in the radial direction around the central axis of the shaft portion 52. In the figure, four small-diameter blades 54 are provided. The shaft portion 52 protrudes toward the motor 10 through the through hole 36 formed in the center of the cover 32, and the drive shaft 12 of the motor 10 is inserted into the hole provided in the shaft portion 52. A draining disk 14 is attached to the upper surface of the shaft portion 52 to prevent the drain water sprayed from the through hole 36 of the cover 32 from scattering to the motor 10 side.
[0005]
The small-diameter blade 54 of the rotary blade 50 is inserted into the pipe-shaped suction port 42 of the housing 40. The suction end portion 43 of the suction port 42 is formed in a tapered surface whose inner diameter is reduced toward the opening end, and the tip end portion of the small-diameter blade 54 is also formed in a tapered surface 56. A large-diameter blade 60 of the rotary blade 50 is accommodated in the pump chamber 44 of the housing 40.
[0006]
14 is a side view of the rotary blade 50, FIG. 15 is a detailed view of a portion B in FIG. 14, FIG. 16 is a top view of the rotary blade 50, and FIGS. 17 (A), 17 (B) and 17 (C) are FIG. It is a figure which shows a part of AA sectional drawing, BB cross section, and CC cross section.
[0007]
The rotary blade 50 includes a shaft portion 52 and a plate-shaped large-diameter blade 60 extending radially outward from the outer peripheral portion of the shaft portion 52, and the lower edge portion of the large-diameter blade 60 is formed in a tapered shape. The edges are connected by a disc-shaped annular member 62 having a hollow portion 63. A small-diameter blade 54 is provided below the large-diameter blade 60. The large-diameter blades 60 and the small-diameter blades 54 are integrally formed of a resin and are each four flat plates, but the number of the blades is appropriately selected. Auxiliary blades 68 are provided between the large-diameter blades 60. The pump head can be increased by the auxiliary blade 68. A hole 53 for inserting a motor drive shaft is provided at the center of the shaft portion 52, and the tip end portion of the small-diameter blade 54 is formed in a tapered surface 56. The inclination angle of the tapered surface 56 is, for example, 45 degrees.
[0008]
The small-diameter blade 54 is formed with an arc-shaped chamfered portion 57 with respect to the rotation direction. The arc-shaped chamfered portion 57 has a radius of curvature substantially equal to the thickness dimension of the small-diameter blade. By providing the chamfered portion 57, noise due to the stirring of drain water in the suction port 42 is reduced, and the small-diameter chamfered portion 57 is reduced. The drain water is smoothly pulled up into the pump chamber 44 by the rotation of the blades 54.
[0009]
The outer peripheral ends of the large-diameter blade 60 and the auxiliary blade 68 are connected by a cylindrical wall member 64. The cylindrical wall member 64 is provided with a height lower than the height of the upper edge portions of the large-diameter blade 60 and the auxiliary blade 68. Further, an arc-shaped chamfered portion 70 is formed inside the upper edge portion of the cylindrical wall member 64. According to the cylindrical wall member 64, the flow of bubbles generated from the liquid by the rotation of the large-diameter blade 60 smoothly flows to the discharge port 46, and the collision of the bubbles with the bottom surface 35 of the cover 32 is alleviated, and noise is generated. When the drainage pump stops, the water returning from the discharge port 46 to the pump chamber 44 in the casing hits the cylindrical wall member 64 and is gradually diffused by the buffering of the cylindrical wall member 64 to return water. The resulting noise is also reduced. In addition, the arc-shaped chamfered portion 70 has a radius of curvature substantially equal to the thickness of the cylindrical wall member 64, for example, and by providing the arc-shaped chamfered portion 70, the large-diameter blade 60 and the auxiliary blade 68 are provided. The drain water to which the energy flowing in the radial direction by the rotation of the water smoothly moves over the upper edge portion of the cylindrical wall member 64, so that the noise can be reduced.
[0010]
The lower end portion of the cylindrical wall member 64 is annularly connected to an annular member 62 that connects the lower edge portion of the large-diameter blade 60 and the auxiliary blade 68. In addition, although the case where the cylindrical wall member 64 and the annular member 62 are comprised integrally is shown in the figure, it is needless to say that they may be constituted separately. Due to the annular member 62, the level of the drain water rising from the suction port 42 is substantially divided up and down, the amount of water in contact with the large-diameter blade is reduced, and the generation of bubbles is reduced. The inner peripheral side of the annular member 62 has an opening 63 between the center portion of the rotary blades. The lower edge portion of the large-diameter blade 60 and the auxiliary blade 68 is formed in a shape inclined toward the small-diameter blade 64, and the annular member 62 is also formed in a dish shape in accordance with this inclination.
[0011]
[Problems to be solved by the invention]
By the way, in the configuration of the conventional drainage pump, noise can be reduced by forming the height of the upper edge of the cylindrical wall member lower than the height of the upper edge of the large-diameter blade. No special consideration was given to making the work more effective.
The present invention has been made in view of the above points, and an object of the present invention is to provide a drainage that can reduce noise by determining the relationship between the height of the cylindrical wall member and the discharge port. To provide a pump.
[0012]
[Means for Solving the Problems]
The inventors of the present invention have made various studies on the positional relationship between the height of the cylindrical wall member and the discharge port in order to keep the noise level low. As a result, it has been found that the height dimensions of both may be set to a predetermined relationship.
[0013]
Thus, the drainage pump according to the present invention is connected to the rotary shaft connected to the drive shaft of the motor and the drive shaft of the motor provided with the suction port at the lower end and the discharge port at the upper side. In a drainage pump having a rotary blade and a housing that houses the rotary blade, the rotary blade has a shaft portion coupled to a drive shaft of a motor, and a plurality of plate-shaped large diameters provided radially from the shaft portion. A disk-shaped annular member having a blade, a plurality of plate-shaped small-diameter blades provided in the axial direction below the large-diameter blade, a hollow portion connecting the lower edge of the large-diameter blade, and the disk-shaped A cylindrical wall member that is connected to the outer peripheral edge of the large-diameter blade at the outer edge of the annular member, and the cylindrical wall member with respect to the height dimension from the center of the discharge port to the upper edge of the discharge port 60% to 100% of the height position to the top edge It is characterized in that formed on a position.
[0014]
Moreover, as a preferable specific aspect of the drainage pump according to the present invention, an auxiliary blade is erected on a disk-shaped annular member inside the cylindrical wall member.
[0015]
In the drainage pump according to the present invention configured as described above, the height of the cylindrical wall member is 60% to 100% with respect to the height from the center of the discharge port to the upper edge of the discharge port. By arranging in the position, the noise generated from the discharge pump can be effectively reduced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a drainage pump according to the present invention will be described with reference to the drawings. In the description of the embodiment, components having the same functions as those of the conventional example will be described with the same reference numerals. In the embodiment, the motor is the same as that of the conventional example. Is omitted, and only the configuration of the rotary blades constituting the pump body is shown.
1 is a front view of an embodiment of a rotary blade constituting a pump body, FIG. 2 is a top view seen from the direction of arrow P in FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2 is a sectional view taken along the line D-D in FIG. 5, FIG. 5 is a sectional view taken along the line G-G in FIG. 2, FIG. 6 is a sectional view taken along the line E-E in FIG. It is HH sectional drawing.
[0017]
The rotary blade 50 is made by molding plastic and has a plurality of flat plate-like, for example, four small-diameter blades 410. The upper portion of the small-diameter blade is connected to a plurality of, for example, four large-diameter blades 450 via a tapered portion 411.
[0018]
A cylindrical shaft 420 is provided at the center of the large-diameter blade 450, and the shaft 420 has a bottomed hole 430 at the center. A motor output shaft (not shown) is press-fitted into the hole 430 to transmit the rotational force of the motor to the rotary blade 50.
The lower edge portion of the large-diameter blade 450 is covered with a disk-shaped annular member 460. An opening 462 is formed at the center of the annular member 460.
[0019]
The outer peripheral edge of the disc-shaped annular member 460 is connected to the cylindrical wall member 470. The wall member 470 connects the outer edge portions of the large-diameter blades 450, and the upper edge portion 472 of the cylindrical wall member 470 is formed lower than the upper edge portion 451 of the large-diameter blades 450.
[0020]
Four auxiliary large-diameter blades 452 are provided inside the cylindrical wall member 470. The auxiliary blade 452 is disposed in the middle of the four large-diameter blades 450 and extends in the direction of the opening 462 of the disk-shaped annular member 460. In the embodiment shown in FIG. 6, the inner edge 454 has a shape extending to the vicinity of the position of the opening 462 of the disc-shaped annular member 460.
The height position of the upper edge portion 453 of the auxiliary blade 452 is adjusted to the height position of the upper edge portion 451 of the large diameter blade 450, and the upper edge portion 451 of the large diameter blade 450 and the upper edge portion 453 of the auxiliary blade 452. Is exposed from the upper edge 472 of the cylindrical wall member 470. This exposed part contributes to ensuring the maximum lift of the rotating blades. Further, only the upper edge portion of the large-diameter blade and the auxiliary blade may be exposed.
[0021]
7 and 8 show the shapes of a tapered portion 412 formed at the lower end portion of the small-diameter blade 410 and an arc-shaped chamfer 414 formed at the outer edge portion of the small-diameter blade 410.
The blade | wing which is a rotary body with which the drainage pump of this invention is equipped has the above shapes and structures, and comprises a lightweight rotary body. Therefore, pumping with less vibration and noise can be achieved.
[0022]
FIG. 9 is a front view showing an embodiment of the pump main body 30 of the drainage pump, which includes the rotary blade 50 shown in FIGS. 1 to 8, and the rotary blade 50 with respect to the center line of the inner diameter port of the discharge port 46. FIG. 10 shows the discharge port 46 as viewed from the direction of arrow Y in FIG. 9. The discharge port 46 is used to test the change in the noise and maximum head characteristics of the drainage pump when the height position of the drainage pump is changed. FIG.
The inner diameter part of the discharge port 46 has a shape in which the flow path expands in a tapered shape from the small diameter part 46a on the housing side to the large diameter part 46b on the outlet side.
Since the diameter of the small diameter portion 46a is set to 5 mm, the distance H ₁ from the center line to the upper edge of the small diameter portion 46a is 2.5 mm.
With respect to H ₁ , the height position of the rotary blade 50 relative to the center line of the discharge port, specifically, the height dimension H ₂ of the upper edge 472 of the cylindrical wall member 470 is changed, and an experiment is performed. It was.
[0023]
FIGS. 11 and 12 show the experimental results at the rated voltages of 50 Hz and 60 Hz, respectively, using the pump body shown in FIG. 9, and the dimension H ₂ is changed from 1.0 mm to 3.5 mm every 0.5 mm. FIG. 5 is a characteristic curve showing the H ₂ / H ₁ ratio on the horizontal axis and the noise (dB) and the deadline lifting height (mm) on the vertical axis when changed.
[0024]
In FIG. 11, while maintaining the high performance of the deadline lift represented by the curve connected by the crosses in the figure, the noise performance is the same for the lift of 700 mm when the H ₂ / H ₁ ratio is 1.5 / 2.5. The noise performance decreases at the time of discharging the retained drain water (represented by a curve connected by Δ in the figure) and at the end of the drain water discharge (represented by a curve connected by □ in the figure), and this noise performance is H ₂ / H _The ratio ₁ is maintained at 2.0 / 2.5 and 2.5 / 2.5, but the deadline lift is lowered when the H ₂ / H ₁ ratio is 2.5 / 2.5.
[0025]
Also in FIG. 12, the performance of the deadline lift and the noise performance similar to FIG. 11 are shown. That is, when the H ₂ / H ₁ ratio is 1.5 / 2.0, a high deadline lift (represented by a curve connected with a cross in the figure) is maintained, and the noise performance is drain water that maintains a lift of 700 mm. At the time of discharge (represented by a curve connected by △ in the figure) and at the end of drain water discharge (represented by a curve connected by □ in the figure), this noise performance is in the ratio of H ₂ / H ₁ Although maintained at 2.0 / 2.5 and 2.5 / 2.5, the deadline lift is lowered when the H ₂ / H ₁ ratio is 2.5 / 2.5.
[0026]
Therefore, according to the experimental results of FIG. 11 and FIG. 12, the H ₂ / H ₁ ratio is 1.5 / 2.5 or more and 2.5 / 2.5 or less, that is, with respect to the radial dimension of the discharge port, By setting the height dimension from the center line to the upper edge of the cylindrical wall member 470 of the rotary blade 50 within the range of 60% or more and 100% or less, the noise reduction effect can be obtained without impairing the deadline lifting performance. It can be done.
[0027]
In the embodiment described above, the case where the auxiliary blade is formed on the rotary blade 50 has been described. However, the present invention can be applied to the case where the auxiliary blade is not used, and the large blade or the auxiliary blade. The blade can also be applied to a configuration in which the upper edge portion is not exposed to the upper edge portion of the cylindrical wall member.
[0028]
【The invention's effect】
As can be understood from the above description, the drainage pump according to the present invention sets the positional relationship between the height of the cylindrical wall member of the rotary blade and the discharge port within an appropriate range. Can be reduced.
Moreover, since the external shape and main components of the conventional drainage pump are not significantly changed, it is possible to manufacture a drainage pump capable of reducing noise at low cost.
[Brief description of the drawings]
FIG. 1 is a front view of a rotary blade of a drainage pump according to the present invention.
FIG. 2 is a plan view of a rotary blade of the drainage pump of the present invention.
3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG.
5 is a cross-sectional view taken along the line GG in FIG.
6 is a cross-sectional view taken along the line E-E in FIG. 4;
FIG. 7 is a detailed view of part F in FIG. 1;
8 is a cross-sectional view taken along the line HH in FIG.
FIG. 9 is an explanatory view showing dimensions of the rotary blade of the present invention.
FIG. 10 is a characteristic curve diagram showing the effect of the present invention.
FIG. 11 is a characteristic curve diagram showing the effect of the present invention.
FIG. 12 is a characteristic curve diagram showing the effect of the present invention.
FIG. 13 is a side view showing a part of a conventional drainage pump.
14 is a side view of the rotary blade of FIG. 13;
FIG. 15 is a detailed view of part B in FIG. 14;
16 is a top view of the rotary blade of FIG. 14;
17 is a cross-sectional view for explaining the rotary blade shown in FIGS. 14 and 16. FIG.
[Explanation of symbols]
50 Rotating blade 410 Small diameter blade 450 Large diameter blade 460 Annular member 470 Cylindrical wall member

Claims

A rotary vane connected to the motor drive shaft, a rotary vane connected to the motor drive shaft provided with a suction port at its lower end and a discharge port on the upper side thereof, and a housing for housing the rotary vane The rotary vane has a shaft portion coupled to the drive shaft of the motor, a plurality of plate-shaped large-diameter blades provided radially from the shaft portion, and a shaft below the large-diameter blade. A plurality of plate-shaped small-diameter blades provided in a direction, a disk-shaped annular member having a hollow portion connecting the lower edge of the large-diameter blade, and the large-diameter at the outer edge of the disk-shaped annular member The cylindrical wall member that connects the outer peripheral edges of the blades, and the ratio of the height position from the center of the discharge port to the upper edge of the discharge port to the upper edge of the cylindrical wall member Is formed at a position from 60% to 100%. Water pump.

2. The drainage pump according to claim 1, wherein an auxiliary blade disposed in the middle of the large-diameter blade is erected on the disk-shaped annular member inside the cylindrical wall member.

2. The discharge pump according to claim 1, wherein an upper edge portion of the large-diameter blade is exposed at an upper edge portion of the cylindrical wall member.

The drainage pump according to claim 2, wherein an upper edge of the auxiliary blade is exposed at an upper edge of the cylindrical wall member.