JP2011247098A - Electric blower - Google Patents
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- JP2011247098A JP2011247098A JP2010118124A JP2010118124A JP2011247098A JP 2011247098 A JP2011247098 A JP 2011247098A JP 2010118124 A JP2010118124 A JP 2010118124A JP 2010118124 A JP2010118124 A JP 2010118124A JP 2011247098 A JP2011247098 A JP 2011247098A
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Abstract
Description
本発明は電動送風機に関する。 The present invention relates to an electric blower.
電動機とファンが一つのユニットにまとめられた電動送風機は、家庭用電気機器の分野でも、電子機器の冷却ファンや電気掃除機の真空源などとして広く用いられている。その中でも電気掃除機用の電動送風機は、大風量と高真空を両立させる必要があるところから、ファンケーシング内で遠心ファンを高速回転させる構成が採用されている。
ファンケーシング内で遠心ファンを高速回転させるにあたり、遠心ファンの外周の吐出口から吹き出された空気の一部が再び遠心ファンの中心の吸込口に引き込まれ、送風効率を低下させるという問題が古くから指摘されている。これに対しては、ファンケーシングの内面にシール部材を取り付け、このシール部材に遠心ファンの吸込口を押し付けて、吐出口の方から戻ってくる空気を遮断するという方策が提案されている。これを実施すれば、シール部材が遠心ファンの吸込口で削られることにより、シール部材は遠心ファンにしっくりとなじみ、低摩擦で気密性の高いシール部が構成される。このような電動送風機の例を特許文献１〜４に見ることができる。
特許文献１に記載された電動送風機では、シール部材として、多孔質のポリテトラフロロエチレン樹脂が用いられている。
特許文献２に記載された電動送風機では、シール部材として、弾性率が２０〜５０ｋｇ／ｃｍ２のポリテトラフロロエチレン樹脂が用いられている。
特許文献３に記載された電動送風機では、シール部材として、耐熱性、低摩擦性、柔軟性を有すると共に、けずれやすい紫外線硬化性樹脂が用いられている。
特許文献４に記載された電動送風機では、シール部材として、ポリエチレンフォーム材が用いられている。
An electric blower in which an electric motor and a fan are combined into one unit is widely used as a cooling fan for electronic equipment and a vacuum source for an electric vacuum cleaner in the field of household electrical equipment. Among them, an electric blower for a vacuum cleaner employs a configuration in which a centrifugal fan is rotated at a high speed in a fan casing because it is necessary to achieve both a large air volume and a high vacuum.
When rotating a centrifugal fan at high speed in a fan casing, a part of the air blown out from the discharge port on the outer periphery of the centrifugal fan is again drawn into the suction port at the center of the centrifugal fan, and the problem of lowering the blowing efficiency is long since It has been pointed out. For this, a measure has been proposed in which a seal member is attached to the inner surface of the fan casing and the suction port of the centrifugal fan is pressed against the seal member to block air returning from the discharge port. If this is implemented, the seal member is shaved at the suction port of the centrifugal fan, so that the seal member fits well with the centrifugal fan, and a low friction and highly airtight seal portion is formed. Examples of such electric blowers can be found in Patent Documents 1 to 4.
In the electric blower described in Patent Document 1, porous polytetrafluoroethylene resin is used as a sealing member.
In the electric blower described in Patent Document 2, a polytetrafluoroethylene resin having an elastic modulus of 20 to 50 kg / cm 2 is used as a sealing member.
In the electric blower described in Patent Document 3, an ultraviolet curable resin that has heat resistance, low friction properties, and flexibility and is easily displaced is used as a seal member.
In the electric blower described in Patent Document 4, a polyethylene foam material is used as a sealing member.
特許文献１、２で提案されたポリテトラフロロエチレン樹脂（ＰＴＦＥ）は、低摩擦材料の代表格であり、高速回転する遠心ファンに接触させるのに好適する。しかしながら、それをシートの形にしてリング状のシール部材を打ち抜くという製造工程で、厚みや寸法の安定性に欠け、寸法管理が難しいという問題があった。また、摩擦係数が低いというメリットの反面、接着性が悪く、接着固定することが難しい。何よりもＰＴＦＥは高価であり、リング状に打ち抜いたりすれば余計に材料の歩留まりが悪くなり、コストアップを招いていた。
特許文献３、４で提案されたシール部材の材料はＰＴＦＥに比べ安価である。しかしながら、接触抵抗、削りかすの処理、変形によるシール性の悪化など、改善すべき点も多かった。
本発明は上記の点に鑑みなされたものであり、遠心ファンの吸込口の箇所のシールを合理的に構成し得る電動送風機を提供することを目的とする。
The polytetrafluoroethylene resin (PTFE) proposed in Patent Documents 1 and 2 is a typical low friction material and is suitable for contacting with a centrifugal fan rotating at high speed. However, in the manufacturing process of punching out a ring-shaped seal member in the form of a sheet, there is a problem that the thickness and dimensional stability are lacking and dimensional management is difficult. Moreover, although the merit that a friction coefficient is low, adhesiveness is bad and it is difficult to adhere and fix. Above all, PTFE is expensive, and if it is punched into a ring shape, the yield of the material becomes worse and the cost is increased.
The material of the sealing member proposed in Patent Documents 3 and 4 is less expensive than PTFE. However, there are many points that need to be improved, such as contact resistance, shaving treatment, and deterioration of sealing performance due to deformation.
This invention is made | formed in view of said point, and it aims at providing the electric blower which can comprise rationally the seal | sticker of the location of the inlet of a centrifugal fan.
本発明の好ましい実施形態によれば、電動送風機は、電動機と、前記電動機のシャフトに固定された遠心ファンと、前記遠心ファンを囲むファンケーシングを備え、前記ファンケーシングの構成要素であるファンカバーの内面に、前記遠心ファンの吸込口が接触するシール部材が取り付けられるものであって、前記シール部材はエチレン―酢酸ビニル共重合樹脂の発泡材により構成されている。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記シール部材の発泡率は８倍から１２倍である。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記ファンカバーを金型に入れた上での発泡処理により前記シール部材が形成される。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記シール部材は前記ファンカバーの内面に密着する断面形状に成型され、前記ファンカバーに接着固定される。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記シール部材はシート材料を打ち抜いて形成され、リング状のホルダに取り付けた状態で前記ファンカバーに固定されるものであるとともに、前記ファンカバーの吸込口は前記ファンケーシングの内側に向かって突き出す形状となっており、その突き出した部分の外周面に前記シール部材が密着する。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記ホルダと前記ファンカバー吸込口がしまりばめ嵌合を形成する。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記ホルダの外縁部に、前記シール部材を囲むリング状リブが形成されている。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記ホルダは、当該電動送風機の軸線方向に突出するリブで前記ファンカバーに接触するものであり、前記ホルダの外周部と前記ファンカバーの間には隙間が生じている。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記ホルダの外周部は、前記ファンカバーとの間に隙間が生じ、且つ前記電動機に向かってすぼまるテーパ部を備えた形状である。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記ホルダの外周面に段差が形成されている。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記ホルダは、前記ファンカバーに面する第１ホルダ部材と、前記ファンに面する第２ホルダ部材により構成され、前記第１ホルダ部材と前記第２ホルダ部材の間に前記シール部材が挟み込まれる。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記第２ホルダ部材に、前記第１ホルダ部材の外側に被さるリング状リブが形成されている。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記第１ホルダ部材と前記第２ホルダ部材の間に、互いの連結を維持する弾性連結部が形成されている。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記弾性連結部は、前記第１ホルダ部材と前記第２ホルダ部材の一方に設けられた凸部と他方に設けられた凹部からなる。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記第１ホルダ部材と前記第２ホルダ部材の少なくとも一方に、前記シール部材に食い込む突起を形成した。
本発明の好ましい実施形態によれば、上記構成の電動送風機において、前記突起がリング状リブからなる。
According to a preferred embodiment of the present invention, an electric blower includes an electric motor, a centrifugal fan fixed to the shaft of the electric motor, and a fan casing surrounding the centrifugal fan, and a fan cover that is a component of the fan casing. A sealing member that contacts the suction port of the centrifugal fan is attached to the inner surface, and the sealing member is made of a foamed material of ethylene-vinyl acetate copolymer resin.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the foaming rate of the seal member is 8 to 12 times.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the sealing member is formed by foaming treatment after the fan cover is placed in a mold.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the seal member is molded into a cross-sectional shape that is in close contact with the inner surface of the fan cover, and is bonded and fixed to the fan cover.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the seal member is formed by punching a sheet material, and is fixed to the fan cover in a state of being attached to a ring-shaped holder, The suction port of the fan cover has a shape protruding toward the inside of the fan casing, and the seal member is in close contact with the outer peripheral surface of the protruding portion.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the holder and the fan cover suction port form an interference fit.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, a ring-shaped rib surrounding the seal member is formed on the outer edge portion of the holder.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the holder contacts the fan cover with a rib protruding in the axial direction of the electric blower, and an outer peripheral portion of the holder and the fan There is a gap between the covers.
According to a preferred embodiment of the present invention, in the electric blower having the above-described configuration, the outer peripheral portion of the holder has a tapered portion that forms a gap with the fan cover and is tapered toward the electric motor. It is.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, a step is formed on the outer peripheral surface of the holder.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the holder includes a first holder member facing the fan cover and a second holder member facing the fan, and the first holder The seal member is sandwiched between a member and the second holder member.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the second holder member is formed with a ring-shaped rib that covers the outside of the first holder member.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, an elastic connecting portion that maintains the connection between each other is formed between the first holder member and the second holder member.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the elastic connecting portion includes a convex portion provided on one of the first holder member and the second holder member and a concave portion provided on the other. Become.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, a protrusion that bites into the seal member is formed on at least one of the first holder member and the second holder member.
According to a preferred embodiment of the present invention, in the electric blower configured as described above, the protrusion is formed of a ring-shaped rib.
本発明の要であるエチレン―酢酸ビニル共重合樹脂（Ethylene-Vinyl Acetate：以下「ＥＶＡ」の略称を用いる）は、ポリエチレンよりも柔らかく弾力に富み、軽量且つ安価である。シール部材を構成するのはＥＶＡの発泡材であるから弾性がさらに高まり、遠心ファンから加わる圧力を容易に吸収できる。硬質のＥＴＦＥのように、加圧で塑性変形してシール性が損なわれるといったこともない。ＥＶＡの耐熱性は電動送風機に用いるには十分なものであるが、それでも遠心ファンが接触する部分は摩擦熱で溶融する。溶融が生じれば気泡が塞がれて滑らかになるので、シール性が一層向上する。溶融しない箇所は気泡による微細な凹凸が残っていて接着剤が浸透しやすいので、接着性も良い。発泡材であることから遠心ファンで削られる分の材料が少なく、削りかすの量が少ないことから、それが風路の下流側に付着して問題を引き起こすといったことも少ない。 The ethylene-vinyl acetate copolymer resin (Ethylene-Vinyl Acetate: hereinafter abbreviated as “EVA”), which is the key of the present invention, is softer, more elastic, lighter and less expensive than polyethylene. Since the sealing member is made of EVA foam, the elasticity is further enhanced and the pressure applied from the centrifugal fan can be easily absorbed. Unlike hard ETFE, there is no such thing as plastic deformation caused by pressurization and loss of sealing performance. Although the heat resistance of EVA is sufficient for use in an electric blower, the portion where the centrifugal fan contacts is still melted by frictional heat. If melting occurs, the bubbles are closed and smooth, so that the sealing performance is further improved. The part that does not melt has fine irregularities due to air bubbles, and the adhesive is easy to permeate. Since it is a foam material, there is little material to be scraped by the centrifugal fan, and the amount of shavings is small, so that it is less likely to adhere to the downstream side of the air passage and cause problems.
以下、本発明の第１実施形態に係る電動送風機の構造を図１、２に基づき説明する。
電動送風機１は、電動機１０の前部にファンケーシング２０が結合された構成となっている。電動機１０は整流子電動機であって、板金のプレス成型品からなるモータケーシング１１の中に、固定子１２と、固定子１２の中で回転する電機子１３と、電機子１３の整流子部分に接触して電機子１３に電力を供給するカーボンブラシ１４が配置されている。電機子１３はシャフト１５に固定され、シャフト１５はモータケーシング１１に保持される軸受１６、１７により回転自在に支持されている。
モータケーシング１１には、固定子１２より後方の位置に排気口１８が形成され、前部にはフランジ１９が形成される。フランジ１９と、それに前方から被さるファンカバー２１が、ファンケーシング２０を構成する。ファンカバー２１も板金のプレス成型品である。
シャフト１５の前端は電動機１０からファンケーシング２０の中に突き出し、ここに遠心ファン２２が固定される。遠心ファン２２は前面シュラウド２３と後面シュラウド２４を前後に間隔を置いて配置し、その間に複数のブレード２５を挟み込んだ構成である。前面シュラウド２３、後面シュラウド２４、及びブレード２５はいずれも板金により構成される。前面シュラウド２３の中心には前方に突き出した吸込口２６が形成される。前面シュラウド２３と後面シュラウド２４の間の空間の外周側の端は吐出口２７となる。
モータケーシング１１の前面には合成樹脂製のディフューザー３０がねじ止め固定される。ディフューザー３０はファンカバー２１に囲い込まれるものであり、ディスク３１と、ディスク３１の前面に形成された複数のディフューザー翼３２と、ディスク３１の後面に形成された複数のリターンガイド３３を備える。リターンガイド３３同士の間の空間は電動機１０の内部空間に通じている。
ファンカバー２１の中心には遠心ファン２２への入口となる吸込口３５が形成されて
いる。吸込口３５は、一旦前方に突き出した後、ベルマウス部３６を形成しつつファンケーシング２０の内側に向かって突き出し、筒状部３７を形成している。筒状部３７の外径は、遠心ファン２２の吸込口２６の内径より少し小さい。ファンカバー２１の外周には、ディフューザー翼３２から吐出された空気の一部を外に出すスリット３８が形成されている。
電動機１０を駆動し、遠心ファン２２を回転させると、ファンカバー２１の吸込口３５と遠心ファン２２の吸込口２６を通じて遠心ファン２２に空気が吸い込まれる。遠心ファン２２から吐出された空気はディフューザー翼３２で整流され、ディフューザー３０の外周に吐出される。吐出された空気の一部はスリット３８からファンカバー２１の外に出る。残りの空気はリターンガイド３３の間を通って電動機１０に達し、電動機１０の各所の隙間を通り抜ける。これにより電動機１０は冷却される。電動機１０を通り抜けた空気はモータケーシング１１の排気口１８から排出される。
遠心ファン２２の吐出口２７から吐出された空気は全量がディフューザー３０に向かうべきものである。そこで、前面シュラウド２３の前から吸込口２６に戻る空気流が生じないよう、ファンカバー２１の内面に、吸込口３５の筒状部３７を囲む形でリング状のシール部材４０を取り付け、これに遠心ファン２２の吸込口２６を接触させる。シール部材４０は吸込口２７で削られて遠心ファン２２になじみ、低摩擦で気密性の高いシール部が構成される。
シール部材４０にはＥＶＡの発泡材を用いる。ＥＶＡはポリエチレンよりも柔らかく弾力に富み、軽量且つ安価である上、発泡材であるから弾性がさらに高まり、遠心ファン２２から加わる圧力を容易に吸収できる。遠心ファン２２が接触する部分は摩擦熱で溶融し、溶融が生じれば気泡が塞がれて滑らかになるので、シール性が一層向上する。溶融しない箇所は気泡による微細な凹凸が残っていて接着剤が浸透しやすいので、接着性も良い。発泡材であることから遠心ファンで削られる分の材料が少なく、削りかすの量が少ないことから、それが風路の下流側に付着して問題を引き起こすといったことも少ない。
ＥＶＡの発泡率は８倍から１２倍とする。発泡率が高くなると発泡材に腰がなくなり、取り扱いが難しくなるほか、表面が粗くなるのでシール性が落ちる。逆に発泡率が低いと見掛け硬度が高くなり、遠心ファン２２がロックする危険度が高まる。発泡率を８倍から１２倍としておけば、弾性と硬度をほどよく保つことができる。
第１実施形態のシール部材４０は、ファンカバー２１の内面に、吸込口３５を囲む形でドーナツ形の凹部が生じていることを利用して、図示しない金型の中にファンカバー２１を入れ、ＥＶＡの発泡処理を行うことにより、ファンカバー２１に一体成型される。これにより、ファンカバー２１の内面形状そのままの形で、ファンカバー２１にぴったりと密着したシール部材４０を得ることができる。シール部材４０は吸込口３５に対し位置ずれを生じることがないので、遠心ファン２２に対する位置も不変であり、良好なシール性が維持される。シール部材４０を固定するのに接着剤を用いる必要もない。
続いて電動送風機１のその他の実施形態を説明する。いずれの実施形態も他と異なるのはシール箇所の構成だけであり、それ以前の実施形態と共通の構成要素にはそれ以前の実施形態の説明で用いたのと同じ符号を付し、説明は省略する。
本発明の第２実施形態を図３に示す。第２実施形態は、シール部材４０をファンカバー２１に一体成型せず、ファンカバー２１の内面形状に沿う形状のシール部材４０を別途成型し、それを接着剤４１でファンカバー２１に固定している。接着の工程は増えるが、ファンカバー２１を入れて一体成型を行う金型を製作する必要はなくなる。
本発明の第３実施形態を図４に示す。第３実施形態では、シート材料を打ち抜いて形成されたシール部材４０を、ファンカバー２１の内面形状に沿う断面形状のリング状ホルダ４２に取り付け、この状態でファンカバー２１に固定される。シール部材４０の内周面は筒状部３７の外周面に密着する。ホルダ４２の材料としては安価な汎用樹脂、例えばＡＢＳ（acrylonitrile-butadiene-styrene）を用いることができる。ホルダ４２に対するシール部材４０の固定と、ファンカバー２１に対するホルダ４２の固定にはいずれも接着剤を用いる。
第３実施形態では、シート材料を打ち抜いたシール部材４０がホルダ４２で裏打ちされているので、シート材料が材質的に腰の弱い種類のものであっても、シール部材４０が不用意に隙間に入り込んだり、めくれ上がったりすることを防止できる。またシール部材４０は筒状部３７に密着しているから、吸込口２６をぎりぎりまで吸込口３５に近づけることができる。つまり吸込口２６、３５間の寸法差を小さくすることができるので、その箇所における乱流損失を低減し、送風効率を高めることができる。
ホルダ４２と筒状部３７は、両者が若干のしまりばめ嵌合を形成するように寸法を設定しておくとよい。これにより、ホルダ４２の位置が安定し、接着剤が固まるまでの間にホルダ４２が移動することを防止できる。
本発明の第４実施形態を図５に示す。第４実施形態は第３実施形態のホルダ４２に次のような改変を加えたものである。すなわち第４実施形態のホルダ４２には、その外縁部に、シール部材４０を囲むリング状リブ４３が形成されている。リング状リブ４３が存在することにより、ホルダ４２とシール部材４０を位置ずれなく接着固定することができ、ホルダ４２を筒状部３７に嵌合させれば、シール部材４０の内周面を筒状部３７の外周面に正しく密着させることができる。これにより、安定した、良好なシール性を得ることができる。
本発明の第５実施形態を図６に示す。第５実施形態は第４実施形態のホルダ４２に次のような改変を加えたものである。すなわち第５実施形態のホルダ４２は、前面が第４実施形態のホルダ４２のようにファンカバー２１の内面形状に沿う形ではなく、平面となっており、そこに、電動送風機１の軸線方向に突出するリブ４４が形成されている。ホルダ４２はリブ４４の端面でファンカバー２１に接触し、ホルダ４２の外周部とファンカバー２１の間には隙間が生じている。これにより、電動送風機１の軸線方向におけるホルダ４２の位置はリブ４４のみによって定まることになり、ホルダ４２の外周部が自由にファンカバー２１の内面に接触する構成に比べ、ホルダ４２の位置が一定化する。これにより、シール部材４０と遠心ファン２２の位置関係、すなわちシール部材４０に対する吸込口２６の食い込み深さが一定になり、安定したシール性を得ることができる。リブ４４は連続するリング状であってもよく、短いリブがリング状に配置された構成であってもよい。
本発明の第６実施形態を図７に示す。第６実施形態は第５実施形態のホルダ４２に次のような改変を加えたものである。すなわち第６実施形態のホルダ４２は、外周面の中で、電動機１０に近い方の端に、電動機１０に向かってすぼまるテーパ部４５を備える。テーパ部４５が存在することにより、ホルダ４２の外周面とファンカバー２１の内面の間に末広がりの隙間が生じ、接着剤４１の塗布が容易になる。テーパ部４５を包むように接着剤４１を盛り上げれば、ホルダ４２の固定は一層確実になる。
本発明の第７実施形態を図８に示す。第７実施形態は第６実施形態のホルダ４２に次のような改変を加えたものである。すなわち第７実施形態のホルダ４２は、外周面には段差４６が形成されており、前面にはリブ４４と同心円をなすリブ４７がリブ４４の外側と内側に形成されている。図８では段差４６の数は２となっているが、その数は任意である。このように段差４６と、加えてリブ４７が存在することにより、接着剤４１が接触する面積が広がり、接着剤４１がホルダ４２を保持する力が一層強化される。
本発明の第８実施形態を図９に示す。第８実施形態は第７実施形態のホルダ４２に次のような改変を加えたものである。すなわち第８実施形態のホルダ４２は、段差４６の数が１に減らされ、リブ４４、４７の形状が消えた、簡素な形になっている。
本発明の第９実施形態を図１０及び図１１に示す。第９実施形態は、シート材料を打ち抜いて形成されたシール部材４０を、２個の部材からなるホルダで保持したことを特徴とする。すなわちホルダ５０は、ファンカバー２１に面するリング状の第１ホルダ部材５１と、ファン２２に面するリング状の第２ホルダ部材５２により構成され、第１ホルダ部材５１と第２ホルダ部材５２の間にシール部材４０を挟み込む。第１ホルダ部材５１の外縁部にはシール部材４０を囲むリング状のリブ５３が形成され、第２ホルダ部材５２の外縁部には第１ホルダ部材５１の外側に被さるリング状のリブ５４が形成されている。
ＥＶＡは本来接着が難しい材料であるが、このように第１ホルダ部材５１と第２ホルダ部材５２でシール部材４０を挟み込む構成を採用することにより、接着の難しさを克服することができる。
シール部材４０を挟み込んだ状態のホルダ５０はファンカバー２１に接着剤で固定することができる。第１ホルダ部材５１に被さっている第２ホルダ部材５２がファンカバー２１に接着固定されるので、第２ホルダ５２部材に第１ホルダ部材５１が固定されなくなったとしても、第１ホルダ部材５１とシール部材４０がファンカバー２１から外れることはない。なお第１ホルダ部材５１と第２ホルダ部材５２を相互に固定する手段は、接着剤であってもよく、しまりばめ嵌合であってもよい。
第１ホルダ部材５１と第２ホルダ部材５２の少なくとも一方には、シール部材４０に食い込む突起を形成する。ここでは、第１ホルダ部材５１は突起５５を、第２ホルダ部材５２には突起５６を、それぞれ形成している。突起５５、５６はいずれもリング状リブからなる。このように突起５５、５６をシール部材４０に食い込ませることにより、シール部材４０の厚さが規定値に満たなかったとしても、シール部材４０が遠心ファン２２に追随して回転することを防ぐことができる。突起５５、５６は短いリブをリング状に配置したものであってもよい。
突起５５、５６は第２ホルダ部材５２の内径より外側、すなわちシール部材４０が第１ホルダ部材５１と第２ホルダ部材５２で挟まれている箇所に設けておくのがよい。このようにしておけば、突起の食い込みでシール部材４０が変形しようとするのを矯正することができ、シール性が損なわれない。
本発明の第１０実施形態を図１２及び図１３に示す。第１０実施形態は第９実施形態のホルダ５０に次のような改変を加えたものである。すなわち第１０実施形態のホルダ５０は、第１ホルダ部材５１と第２ホルダ部材５２の間に、互いの連結を維持する弾性連結部５７が形成されている。弾性連結部５７は、第１ホルダ部材５１と第２ホルダ部材５２の一方に設けられた凸部と他方に設けられた凹部からなる。ここでは、第１ホルダ部材５１のリブ５３の端面から突出する複数の弾性フック５８が凸部となり、弾性フック５８を係合させるべく第２ホルダ部材５２に形成されたリング状の段部５９が凹部となる。
リブ５３の中にシール部材４０を収めた状態の第１ホルダ部材５１を第２ホルダ部材５２に押し付けると、弾性フック５８が段部５９に係合し、第１ホルダ部材５１と第２ホルダ部材５２は図１２に示す連結状態になる。これにより、接着剤を用いることなく、第１ホルダ部材５１と第２ホルダ部材５２を確実に連結することができる。
なお突起５５、５６は、ここでは短いリブをリング状に配置したものが採用されている。
本発明の第１１実施形態を図１４に示す。第１１実施形態は第１０実施形態のホルダ５０に次のような改変を加えたものである。すなわち第１１実施形態のホルダ５０では、弾性連結部５７が、第１ホルダ部材５１のリブ５３から半径方向に向かって、すなわち外側に向かって、突出するフック６０と、フック６０を受け入れるべく第２ホルダ部材５２のリブ５４に形成された切り欠き部６１により構成される。フック６０と切り欠き部６１の組み合わせは所定角度間隔で複数組設けられる。
第１０実施形態では、弾性フック５８が自身の弾性で内側にたわんで段部５９に係合するものであったが、第１１実施形態ではリブ５４が自身の弾性で外側に開いてフック６０に係合する。このため、薄く形成した弾性フック５８が折れる心配がない。金型構造も第１０実施形態に比べシンプル化できる。
以上、本発明の実施形態につき説明したが、本発明の範囲はこれに限定されるものではなく、発明の主旨を逸脱しない範囲で種々の変更を加えて実施することができる。
Hereinafter, the structure of the electric blower according to the first embodiment of the present invention will be described with reference to FIGS.
The electric blower 1 has a configuration in which a fan casing 20 is coupled to the front portion of the electric motor 10. An electric motor 10 is a commutator motor, and a stator 12, an armature 13 rotating in the stator 12, and a commutator portion of the armature 13 in a motor casing 11 made of a sheet metal press-molded product. A carbon brush 14 that contacts and supplies power to the armature 13 is disposed. The armature 13 is fixed to a shaft 15, and the shaft 15 is rotatably supported by bearings 16 and 17 held by the motor casing 11.
In the motor casing 11, an exhaust port 18 is formed at a position behind the stator 12, and a flange 19 is formed in the front part. The flange 19 and the fan cover 21 that covers the flange 19 form the fan casing 20. The fan cover 21 is also a sheet metal press-molded product.
The front end of the shaft 15 protrudes from the electric motor 10 into the fan casing 20, and the centrifugal fan 22 is fixed here. The centrifugal fan 22 has a configuration in which a front shroud 23 and a rear shroud 24 are arranged at intervals in the front-rear direction, and a plurality of blades 25 are sandwiched therebetween. The front shroud 23, the rear shroud 24, and the blade 25 are all made of sheet metal. A suction port 26 protruding forward is formed in the center of the front shroud 23. An end on the outer peripheral side of the space between the front shroud 23 and the rear shroud 24 is a discharge port 27.
A synthetic resin diffuser 30 is screwed to the front surface of the motor casing 11. The diffuser 30 is enclosed by the fan cover 21 and includes a disk 31, a plurality of diffuser blades 32 formed on the front surface of the disk 31, and a plurality of return guides 33 formed on the rear surface of the disk 31. The space between the return guides 33 communicates with the internal space of the electric motor 10.
A suction port 35 is formed at the center of the fan cover 21 as an inlet to the centrifugal fan 22. The suction port 35 once protrudes forward, and then protrudes toward the inside of the fan casing 20 while forming a bell mouth portion 36, thereby forming a cylindrical portion 37. The outer diameter of the cylindrical portion 37 is slightly smaller than the inner diameter of the suction port 26 of the centrifugal fan 22. A slit 38 is formed on the outer periphery of the fan cover 21 to let out a part of the air discharged from the diffuser blade 32.
When the electric motor 10 is driven and the centrifugal fan 22 is rotated, air is sucked into the centrifugal fan 22 through the suction port 35 of the fan cover 21 and the suction port 26 of the centrifugal fan 22. The air discharged from the centrifugal fan 22 is rectified by the diffuser blade 32 and discharged to the outer periphery of the diffuser 30. Part of the discharged air exits from the fan cover 21 through the slit 38. The remaining air passes between the return guides 33 and reaches the electric motor 10, and passes through gaps at various points of the electric motor 10. Thereby, the electric motor 10 is cooled. The air that has passed through the electric motor 10 is discharged from the exhaust port 18 of the motor casing 11.
The entire amount of air discharged from the discharge port 27 of the centrifugal fan 22 should go to the diffuser 30. Therefore, a ring-shaped sealing member 40 is attached to the inner surface of the fan cover 21 so as to surround the cylindrical portion 37 of the suction port 35 so that an air flow returning from the front of the front shroud 23 to the suction port 26 does not occur. The suction port 26 of the centrifugal fan 22 is brought into contact. The seal member 40 is shaved at the suction port 27 and is adapted to the centrifugal fan 22 to form a seal portion with low friction and high airtightness.
An EVA foam material is used for the seal member 40. EVA is softer and more elastic than polyethylene, is lightweight and inexpensive, and is a foamed material, so that it is more elastic and can easily absorb the pressure applied from the centrifugal fan 22. The portion with which the centrifugal fan 22 comes into contact is melted by frictional heat, and if melting occurs, the bubbles are closed and smooth, so that the sealing performance is further improved. The part that does not melt has fine irregularities due to air bubbles, and the adhesive is easy to permeate. Since it is a foam material, there is little material to be scraped by the centrifugal fan, and the amount of shavings is small, so that it is less likely to adhere to the downstream side of the air passage and cause problems.
EVA foaming rate is 8 to 12 times. If the foaming rate is high, the foamed material will become dull and difficult to handle, and the surface will become rough, resulting in poor sealing. On the other hand, when the foaming rate is low, the apparent hardness increases and the risk of the centrifugal fan 22 locking up increases. If the foaming rate is 8 to 12 times, the elasticity and hardness can be kept moderately.
The sealing member 40 according to the first embodiment places the fan cover 21 in a mold (not shown) by using a donut-shaped recess formed on the inner surface of the fan cover 21 so as to surround the suction port 35. By performing EVA foaming treatment, the fan cover 21 is integrally molded. As a result, it is possible to obtain the seal member 40 that is in close contact with the fan cover 21 in the shape of the inner surface of the fan cover 21 as it is. Since the seal member 40 does not shift in position with respect to the suction port 35, the position of the seal member 40 with respect to the centrifugal fan 22 remains unchanged, and good sealing performance is maintained. It is not necessary to use an adhesive to fix the seal member 40.
Next, other embodiments of the electric blower 1 will be described. Each embodiment is different from the other only in the configuration of the seal portion, and the same components as those in the previous embodiment are denoted by the same reference numerals as those used in the description of the previous embodiment. Omitted.
A second embodiment of the present invention is shown in FIG. In the second embodiment, the seal member 40 is not integrally molded with the fan cover 21, but the seal member 40 having a shape that conforms to the inner surface shape of the fan cover 21 is separately molded and fixed to the fan cover 21 with an adhesive 41. Yes. Although the number of bonding steps is increased, it is not necessary to manufacture a mold for performing integral molding by inserting the fan cover 21.
A third embodiment of the present invention is shown in FIG. In the third embodiment, a seal member 40 formed by punching a sheet material is attached to a ring-shaped holder 42 having a cross-sectional shape along the inner surface shape of the fan cover 21, and is fixed to the fan cover 21 in this state. The inner peripheral surface of the seal member 40 is in close contact with the outer peripheral surface of the cylindrical portion 37. As the material of the holder 42, an inexpensive general-purpose resin such as ABS (acrylonitrile-butadiene-styrene) can be used. An adhesive is used for both fixing the seal member 40 to the holder 42 and fixing the holder 42 to the fan cover 21.
In the third embodiment, since the sealing member 40 punched out of the sheet material is lined with the holder 42, the sealing member 40 is inadvertently left in the gap even if the sheet material is of a material type that is weak. It can be prevented from entering and turning up. Further, since the seal member 40 is in close contact with the cylindrical portion 37, the suction port 26 can be brought close to the suction port 35 to the limit. That is, since the dimensional difference between the suction ports 26 and 35 can be reduced, the turbulent flow loss at the location can be reduced and the blowing efficiency can be increased.
The dimensions of the holder 42 and the tubular portion 37 are preferably set so that both form a slight interference fit. Thereby, the position of the holder 42 is stabilized, and the holder 42 can be prevented from moving until the adhesive is hardened.
A fourth embodiment of the present invention is shown in FIG. In the fourth embodiment, the following modification is added to the holder 42 of the third embodiment. In other words, the holder 42 of the fourth embodiment is formed with a ring-shaped rib 43 surrounding the seal member 40 at the outer edge thereof. The presence of the ring-shaped rib 43 allows the holder 42 and the seal member 40 to be bonded and fixed without misalignment. If the holder 42 is fitted to the cylindrical portion 37, the inner peripheral surface of the seal member 40 is cylindrical. It can be made to adhere correctly to the outer peripheral surface of the shaped portion 37. Thereby, the stable and favorable sealing performance can be obtained.
A fifth embodiment of the present invention is shown in FIG. The fifth embodiment is obtained by adding the following modifications to the holder 42 of the fourth embodiment. That is, the holder 42 of the fifth embodiment has a flat front surface that is not in line with the shape of the inner surface of the fan cover 21 like the holder 42 of the fourth embodiment, and there is a flat surface in the axial direction of the electric blower 1. A protruding rib 44 is formed. The holder 42 contacts the fan cover 21 at the end face of the rib 44, and a gap is generated between the outer periphery of the holder 42 and the fan cover 21. As a result, the position of the holder 42 in the axial direction of the electric blower 1 is determined only by the rib 44, and the position of the holder 42 is constant as compared with the configuration in which the outer peripheral portion of the holder 42 freely contacts the inner surface of the fan cover 21. Turn into. Thereby, the positional relationship between the seal member 40 and the centrifugal fan 22, that is, the depth of penetration of the suction port 26 with respect to the seal member 40 becomes constant, and a stable sealing property can be obtained. The rib 44 may have a continuous ring shape, or may have a configuration in which short ribs are arranged in a ring shape.
A sixth embodiment of the present invention is shown in FIG. In the sixth embodiment, the holder 42 of the fifth embodiment is modified as follows. That is, the holder 42 of the sixth embodiment includes a tapered portion 45 that squeezes toward the electric motor 10 at the end closer to the electric motor 10 in the outer peripheral surface. Due to the presence of the tapered portion 45, a widening gap is formed between the outer peripheral surface of the holder 42 and the inner surface of the fan cover 21, and the application of the adhesive 41 is facilitated. If the adhesive 41 is raised so as to wrap the taper portion 45, the holder 42 can be fixed more reliably.
A seventh embodiment of the present invention is shown in FIG. The seventh embodiment is obtained by adding the following modifications to the holder 42 of the sixth embodiment. That is, in the holder 42 of the seventh embodiment, a step 46 is formed on the outer peripheral surface, and ribs 47 concentric with the ribs 44 are formed on the outer and inner sides of the ribs 44 on the front surface. In FIG. 8, the number of steps 46 is 2, but the number is arbitrary. The presence of the step 46 and the rib 47 in this way increases the area where the adhesive 41 comes into contact, and the force with which the adhesive 41 holds the holder 42 is further strengthened.
FIG. 9 shows an eighth embodiment of the present invention. The eighth embodiment is obtained by adding the following modifications to the holder 42 of the seventh embodiment. That is, the holder 42 of the eighth embodiment has a simple shape in which the number of steps 46 is reduced to 1, and the shapes of the ribs 44 and 47 are eliminated.
A ninth embodiment of the present invention is shown in FIGS. The ninth embodiment is characterized in that a seal member 40 formed by punching a sheet material is held by a holder composed of two members. That is, the holder 50 includes a ring-shaped first holder member 51 that faces the fan cover 21 and a ring-shaped second holder member 52 that faces the fan 22, and the first holder member 51 and the second holder member 52 The seal member 40 is sandwiched therebetween. A ring-shaped rib 53 surrounding the seal member 40 is formed on the outer edge of the first holder member 51, and a ring-shaped rib 54 covering the outer side of the first holder member 51 is formed on the outer edge of the second holder member 52. Has been.
EVA is a material that is inherently difficult to bond, but by adopting such a configuration in which the seal member 40 is sandwiched between the first holder member 51 and the second holder member 52, the difficulty of bonding can be overcome.
The holder 50 with the seal member 40 interposed therebetween can be fixed to the fan cover 21 with an adhesive. Since the second holder member 52 covering the first holder member 51 is bonded and fixed to the fan cover 21, even if the first holder member 51 is no longer fixed to the second holder 52 member, The seal member 40 does not come off the fan cover 21. The means for fixing the first holder member 51 and the second holder member 52 to each other may be an adhesive or may be an interference fit.
A protrusion that bites into the seal member 40 is formed on at least one of the first holder member 51 and the second holder member 52. Here, the first holder member 51 has a protrusion 55, and the second holder member 52 has a protrusion 56. Both the protrusions 55 and 56 are ring-shaped ribs. By causing the protrusions 55 and 56 to bite into the seal member 40 in this manner, the seal member 40 is prevented from rotating following the centrifugal fan 22 even if the thickness of the seal member 40 does not reach the specified value. Can do. The protrusions 55 and 56 may be formed by arranging short ribs in a ring shape.
The protrusions 55 and 56 are preferably provided outside the inner diameter of the second holder member 52, that is, at a location where the seal member 40 is sandwiched between the first holder member 51 and the second holder member 52. If it does in this way, it can correct that the sealing member 40 tries to deform | transform by the biting of a processus | protrusion, and a sealing performance is not impaired.
A tenth embodiment of the present invention is shown in FIGS. The tenth embodiment is obtained by adding the following modifications to the holder 50 of the ninth embodiment. That is, in the holder 50 of the tenth embodiment, an elastic connecting portion 57 that maintains the mutual connection is formed between the first holder member 51 and the second holder member 52. The elastic connecting portion 57 includes a convex portion provided on one of the first holder member 51 and the second holder member 52 and a concave portion provided on the other. Here, a plurality of elastic hooks 58 projecting from the end face of the rib 53 of the first holder member 51 become convex portions, and a ring-shaped step portion 59 formed on the second holder member 52 to engage the elastic hooks 58 is provided. It becomes a recess.
When the first holder member 51 in which the seal member 40 is accommodated in the rib 53 is pressed against the second holder member 52, the elastic hook 58 engages with the step portion 59, and the first holder member 51 and the second holder member 52 is in the connected state shown in FIG. Thereby, the 1st holder member 51 and the 2nd holder member 52 can be connected reliably, without using an adhesive agent.
Here, as the protrusions 55 and 56, a short rib arranged in a ring shape is employed.
An eleventh embodiment of the present invention is shown in FIG. The eleventh embodiment is obtained by adding the following modifications to the holder 50 of the tenth embodiment. That is, in the holder 50 according to the eleventh embodiment, the elastic connecting portion 57 has a hook 60 projecting from the rib 53 of the first holder member 51 in the radial direction, that is, outward, and the second to accept the hook 60. A notch 61 is formed in the rib 54 of the holder member 52. A plurality of combinations of hooks 60 and notches 61 are provided at predetermined angular intervals.
In the tenth embodiment, the elastic hook 58 bends inward due to its own elasticity and engages with the step portion 59. However, in the eleventh embodiment, the rib 54 opens outwardly due to its own elasticity and becomes the hook 60. Engage. For this reason, there is no fear that the thin elastic hook 58 is broken. The mold structure can also be simplified compared to the tenth embodiment.
Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.
本発明は電動送風機に広く利用可能である。 The present invention is widely applicable to electric blowers.
１ 電動送風機
１０ 電動機
１１ モータケーシング
２０ ファンケーシング
２１ ファンカバー
２２ 遠心ファン
２６ 吸込口
３５ 吸込口
３７ 筒状部
４１ 接着剤
４２ ホルダ
４３ リング状リブ
４４ リブ
４５ テーパ部
４６ 段差
５０ ホルダ
５１ 第１ホルダ部材
５２ 第２ホルダ部材
５３、５４ リング状リブ
５５、５６ 突起
５７ 弾性連結部
DESCRIPTION OF SYMBOLS 1 Electric blower 10 Electric motor 11 Motor casing 20 Fan casing 21 Fan cover 22 Centrifugal fan 26 Suction port 35 Suction port 37 Cylindrical part 41 Adhesive 42 Holder 43 Ring-shaped rib 44 Rib 45 Tapered part 46 Step 50 Holder 51 First holder member 52 2nd holder member 53, 54 Ring-shaped rib 55, 56 Protrusion 57 Elastic connection part
Claims (16)
前記シール部材をエチレン―酢酸ビニル共重合樹脂の発泡材により構成したことを特徴とする電動送風機。 An electric motor, a centrifugal fan fixed to the shaft of the electric motor, and a fan casing surrounding the centrifugal fan, and a seal member in which an inlet of the centrifugal fan contacts an inner surface of a fan cover which is a component of the fan casing In the electric blower to which
An electric blower characterized in that the seal member is made of a foamed material of ethylene-vinyl acetate copolymer resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010118124A JP2011247098A (en) | 2010-05-24 | 2010-05-24 | Electric blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010118124A JP2011247098A (en) | 2010-05-24 | 2010-05-24 | Electric blower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2011247098A true JP2011247098A (en) | 2011-12-08 |
Family
ID=45412683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010118124A Pending JP2011247098A (en) | 2010-05-24 | 2010-05-24 | Electric blower |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2011247098A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2829736A1 (en) * | 2012-03-21 | 2015-01-28 | Panasonic Corporation | Electric air blower |
| JP2015055156A (en) * | 2013-09-10 | 2015-03-23 | パナソニック株式会社 | Electric blower and vacuum cleaner using electric blower |
| EP2857693A1 (en) * | 2013-10-07 | 2015-04-08 | Miele & Cie. KG | Fan assembly for machine for floorcare |
| EP3293399A1 (en) * | 2016-09-08 | 2018-03-14 | Miele & Cie. KG | Fan assembly for a household appliance, such as vacuum cleaners |
| CN109654059A (en) * | 2018-12-29 | 2019-04-19 | 追创科技(苏州)有限公司 | Impeller and motor |
| JP2019105216A (en) * | 2017-12-13 | 2019-06-27 | 日立グローバルライフソリューションズ株式会社 | Motor-driven blower and vacuum cleaner with motor-driven blower installed |
| JPWO2021144942A1 (en) * | 2020-01-17 | 2021-07-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2829736A1 (en) * | 2012-03-21 | 2015-01-28 | Panasonic Corporation | Electric air blower |
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| US9644635B2 (en) | 2012-03-21 | 2017-05-09 | Panasonic Intellectual Property Management Co., Ltd. | Electric air blower |
| JP2015055156A (en) * | 2013-09-10 | 2015-03-23 | パナソニック株式会社 | Electric blower and vacuum cleaner using electric blower |
| EP2857693A1 (en) * | 2013-10-07 | 2015-04-08 | Miele & Cie. KG | Fan assembly for machine for floorcare |
| EP3293399A1 (en) * | 2016-09-08 | 2018-03-14 | Miele & Cie. KG | Fan assembly for a household appliance, such as vacuum cleaners |
| JP2019105216A (en) * | 2017-12-13 | 2019-06-27 | 日立グローバルライフソリューションズ株式会社 | Motor-driven blower and vacuum cleaner with motor-driven blower installed |
| CN109654059A (en) * | 2018-12-29 | 2019-04-19 | 追创科技(苏州)有限公司 | Impeller and motor |
| JPWO2021144942A1 (en) * | 2020-01-17 | 2021-07-22 | ||
| WO2021144942A1 (en) * | 2020-01-17 | 2021-07-22 | 三菱電機株式会社 | Centrifugal blower and air conditioning device |
| JP7308985B2 (en) | 2020-01-17 | 2023-07-14 | 三菱電機株式会社 | Centrifugal blower and air conditioner |
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