JP3774552B2

JP3774552B2 - Air purifier

Info

Publication number: JP3774552B2
Application number: JP27079497A
Authority: JP
Inventors: 富則石川; 雄二遠山; 誠横山; 芳廣高田; 圭一本間; 修川崎; 昌義井上
Original assignee: Hitachi Industrial Equipment Systems Co Ltd
Current assignee: Hitachi Industrial Equipment Systems Co Ltd
Priority date: 1997-10-03
Filing date: 1997-10-03
Publication date: 2006-05-17
Anticipated expiration: 2017-10-03
Also published as: JPH11108403A

Description

【０００１】
【発明の属する技術分野】
本発明は、半導体や液晶を製造するクリーンルームの天井面に設置する空気清浄装置並びに自立型クリーンブースおよびクリーンベンチ等で送風機の効率向上と騒音低減を目的にターボファンを使用する装置全般に関する。
【０００２】
【従来の技術】
従来は、ターボファンの羽根は図９に示されるように一枚の平板を二次元平面上に湾曲させる形状であった。
【０００３】
また、ターボファンのみで必要な静圧を得るため羽根が多枚数ある羽根車を使用していた。
【０００４】
【発明が解決しようとする課題】
従来は、ターボファンの羽根は一枚の平板を二次元平面上に湾曲させる形状であったので、羽根前縁部が切放しとなり、風切り音で騒音が高くなるとともに、損失が大きく高いファン効率を得られなかった。
【０００５】
また、風向板が設けられていないと、静圧を回復できず、ターボファンのみで必要な静圧を得ようとすると羽根が多枚数必要であった。このように羽根枚数が多くなると羽根に沿う気流の流路損失が羽根枚数の増加に従って増大するという問題があった。
【０００６】
本発明の目的は、高効率でエネルギー消費が少ない空気清浄装置を提供することにある。
【０００７】
【課題を解決するための手段】
本発明は、上記課題を解決するために、羽根車と該羽根車を回転させるモータを有するターボファンと、該ターボファンの吸込口に空気を供給するベルマウスと、前記ターボファンから吹き出された空気を清浄化するフィルタと、前記ターボファンから吹き出された空気を加圧して前記フィルタに導く加圧室を内部に有するハウジングとを備えた空気清浄装置において、前記ターボファンは前記ハウジング内に格納され、前記ハウジングは前記モータを固定するとともに前記羽根車から吹き出された空気を前記フィルタに供給するよう吹き出す開口部を有するモータベースと、前記羽根車に近接して配設された風向板とをその内部に備え、前記羽根車は、１枚の板状部材から成形された翼型羽根と、該翼型羽根を保持する芯板および側板とを備え、前記板状部材の接合部は前記羽根車の回転方向に対して後ろ側でかつ前記翼型羽根の縁部から離れた位置に配置され、前記翼型羽根を前記芯板及び前記側板の間に実質的に密着させて固定し、前記羽根車は翼型形状羽根を有するとともに羽根枚数が４枚以下であることを特徴とするものである。
【０００８】
前記羽根車は、前記翼型羽根と該翼型羽根を保持する芯板および側板とを備え、前記芯板及び側板は前記翼型羽根の先端の外接円の径より大きい外径を有するよう形成され、前記翼型羽根は前記芯板及び前記側板の間に実質的に密着するよう固定され、前記風向板の先端を前記翼型羽根の先端の外接円と前記芯板及び側板外形との間に位置するよう配設したことを特徴とする。
【０００９】
前記風向板は、前記翼型羽根に近接する側が曲線形状の断面を有するよう形成されたことを特徴とする。
【００１０】
前記空気清浄装置において、前記ターボファンは前記ハウジング内に格納され、機外静圧２９．４Ｐａ±１０％、前記フィルタからの平均吹き出し風速０．３ｍ／秒±１０％、風量１３ｍ3／分±１０％のときに消費電力４０Ｗ±１０％となるよう構成されたことを特徴とする。
【００１２】
【発明の実施の形態】
本発明の実施の形態を図１〜図８、図１０〜図１２により説明する。本実施の第１の実施の形態を図１〜図５及び図１２により説明する。
【００１３】
本実施例の空気清浄装置は図１及び図２に示されるように、羽根車２とこの羽根車２を回転させるモータ３を有するターボファン３０と、ターボファン３０の吸込口に空気を供給するベルマウス６と、このターボファン３０から吹き出された空気を清浄化するフィルタ５と、ターボファン３０から吹き出された空気を加圧してフィルタ５に導く加圧室４０を内部に有するハウジング１とを備えた空気清浄装置である。ターボファン３０はハウジング１内に格納され、ハウジング１はモータ３を固定するとともに羽根車２から吹き出された空気をフィルタ５に供給するよう吹き出す開口部を有するモータベース４と、羽根車２に近接して配設された風向板７とをその内部に備え、羽根車２は翼型形状羽根８を有するとともに流路抵抗を小さくするため羽根枚数が４枚以下に設定される。本実施の形態では図３に示されるように、羽根枚数は３枚である。
【００１４】
本実施の形態では図１、図２に示すように風向板７はモータベース４に設けられ、平面方向はハウジング１の側面１ｂから羽根車吹き出し口２ｃの近傍までの長さをもち、高さ方向はモータベース４から本体ハウジング１の第２の面１ａの長さをもつ風向板７を備える。また、風向板７は、翼型羽根８に近接する側が曲線形状の断面を有し、羽根車から吹き出された空気が鈍角に加圧室内に流出し、ターボファン３０外周部の静圧を回復させる。これによりフィルタ５より吹き出される空気量を増加させることができる。
【００１５】
図３に示すように、羽根車２は、翼型羽根８と、この翼型羽根８を保持する芯板９および側板１０とを有している。芯板９及び側板１０は翼型羽根８の先端の外接円の径より大きい外径を有するよう形成される。風向板７の先端７ａは翼型羽根８の先端の外接円と芯板９及び側板１０外形との間に位置するよう配設される。すなわち、風向板７の先端７ａは芯板９及び側板１０の外周の縁より内側に入り込み、かつ、翼型羽根８の先端に接触しない位置に設けられる。ターボファン３０の組立の作業性を向上するためには、羽根車２の側板１０外径は羽根８外径より大きく、芯板９外径は羽根８外径とほぼ同一とすると、装置に羽根車２を組み込む際に、風向板７の先端７ａが芯板９と接触しないため、モータ３への羽根車２の装着が容易になる。
【００１６】
翼型羽根８は芯板９及び側板１０の間に実質的に密着するよう固定される。具体的な固定方法としては、図３〜図５に示すように、翼型羽根８はかしめにより芯板９及び側板１０に固定される。翼型羽根８にはかしめ固定のためのかしめ部１１が芯板９及び側板１０に面する側に突出するよう設けられ、一方、芯板９及び側板１０にはこのかしめ部１１が挿入されるよう穿設された羽根挿入部１８が設けられる。翼型羽根８と芯板９及び側板１０との間の隙間が小さくなり、実質的に密着する状態となるようかしめ部１１を羽根挿入部１８に挿入し、かしめ部１１を折り曲げてかしめることにより翼型羽根８と芯板９及び側板１０とが固定される。図４はかしめ部１１がかしめられた状態の縦断面を示す。かしめ部１１は同図に示されるように翼型羽根８の内側に向かって折曲げられ、これにより羽根挿入部１８の外側の隙間が小さくなり、翼型羽根８と芯板９及び側板１０とが実質的に密着してかしめ部からの空気の漏れが防止される。羽根挿入部１８は羽根形状にあわせて設けられ、かしめ部１１は高圧側と低圧側の羽根に交互に設けられるとともにそれぞれ羽根内部に向けて折曲げられるので、羽根８と芯板９と側板１０の合せ面の隙間が小さくなり、実質的に密着状態となって空気の漏れによる損失を低減することができ、ターボファン３０の効率を向上させることができる。
【００１７】
図５に、翼型羽根８を一枚の板状部材から成形した例を示す。板状部材を成形して翼型断面を有するとともに羽根高圧側１６、羽根低圧側１７にそれぞれ曲面を有する翼型羽根８を形成する。羽根前縁部１３は板状部材が曲面形状に形成されて空気の流入路を滑らかにする効果を有し、これによりファン効率の向上、低騒音化を図ることができる。一方、羽根後縁部１４は板状部材の端部が鋭角状に接続されてスポット溶接等により固定されている。羽根前縁部１３から羽根後縁部１４に至る翼型羽根８の端部にはかしめ部１１が突出するよう設けられる。図５ではかしめ部１１が既に折り曲げられた状態で図示されているが、翼型羽根８を芯板９および側板１０の羽根挿入部１８に挿入する前は羽根高圧側１６あるいは羽根低圧側１７に連なる面で端部から突出している。
【００１８】
本実施例の空気清浄装置はクリーンルーム天井面に組まれた縦６００ｍｍ、横１２００ｍｍのシステム天井格子上に設置される。仕様の１例としては、モータ３は定格出力２６Ｗの三相２００Ｖ５０Ｈｚ対応の誘導電動機であり、ターボファン３０は羽根外径φ３４０で３枚の翼型羽根８を有する羽根車２とこのモータ３を組み合わせたものであり、フィルタ５としては定格風量１８．５ｍ3/min時の定格圧力損失が１０．５ｍｍＡｑ以下（平均９．５ｍｍＡｑ）の高性能フィルタである。この組合せにお蹴る特性は図１２に示されるようになり、吸込口周辺の機外静圧が２９．４Ｐａ（３ｍｍＡｑ）の状態で、フィルタ５下流側のクリーンルーム内へ平均風速０．３ｍ／秒、風量１３ｍ3／分の送風性能で運転したときの消費電力は４０Ｗである。このとき騒音は４３〜４２ｄＢである。仕様の裕度は、フィルタ圧損のバラツキ、モータ、ファン等の部品精度のバラツキにより、風量は約±１０％、消費電力は約±１０％を許容範囲とする。
【００１９】
本発明の第２の実施の形態を図６、図７により説明する。
【００２０】
本実施の形態は、羽根車２を複数枚の板状部材を接合して成形された翼型羽根８と、この翼型羽根８を保持する芯板９および側板１０とにより構成したものである。他の構成は第１の実施の形態と同様である。本実施の形態では翼型羽根８は２枚の板状部材を接合して成形される。２枚の板状部材の一方は羽根高圧側１６になり、他方は羽根低圧側１７になる。２枚の板状部材は組み合わされた状態で翼型断面を有するような形状に成形され、組合せにより羽根高圧側１６、羽根低圧側１７にそれぞれ曲面を有する翼型羽根８が形成される。羽根高圧側１６には羽根前縁部１３が形成され、羽根前縁部１３は板状部材が曲面形状に形成されて空気の流入路を滑らかにする効果を有する。羽根低圧側１７は羽根高圧側１６から羽根前縁部１３を除いたような形状に形成される。２枚の板状部材はそれぞれ羽根低圧側１７、羽根高圧側１６に成形された後に接合される。羽根高圧側１６と羽根低圧側１７の接合部１５は羽根車２の回転方向に対して後ろ側、すなわち回転時に低圧となる羽根低圧側でかつ翼型羽根の前縁部１３から少なくとも翼型羽根の最大厚さ以上離れた位置に配置される。接合部１５は空気流が剥離しない程度のなめらかさを持ち、接合面は羽根前縁部１３に対しては略平行で羽根後縁部１４に対しては傾斜した状態に接合される。本実施の形態でも第１の実施の形態と同様にファン効率の向上、低騒音化を図ることができる。
【００２１】
一方、羽根後縁部１４は羽根高圧側１６と羽根低圧側１７の端部が鋭角状に接続されてスポット溶接等により固定されている。羽根前縁部１３から羽根後縁部１４に至る翼型羽根８の端部にはかしめ部１１が突出するよう設けられる。図６、図７ではかしめ部１１が既に折り曲げられた状態で図示されているが、翼型羽根８を芯板９および側板１０の羽根挿入部１８に挿入する前は羽根高圧側１６あるいは羽根低圧側１７に連なる面で端部から突出している。
【００２２】
本実施の形態でも、羽根挿入部１８は羽根形状にあわせて設けられ、かしめ部１１は高圧側と低圧側の羽根に交互に設けられるとともにそれぞれ羽根内部に向けて折曲げられるので、羽根８と芯板９と側板１０の合せ面の隙間が小さくなり、実質的に密着状態となって空気の漏れによる損失を低減することができ、ターボファン３０の効率を向上させることができる。
【００２３】
本発明の第３の実施の形態を図８により説明する。本実施例は、羽根車２の芯板９と側板１０の補強のために、芯板９の外周部に一体成形リング１９を設けたものである。本実施の形態の羽根車２は、図８に示されるように、翼型羽根８の側板側内径Ｄ1sと羽根外径Ｄ2sの内外径比（Ｄ1s／Ｄ2s）が０．５９〜０．７６の範囲に設定される。他の構成は第１の実施の形態又は第２の実施の形態と同様である。
【００２４】
本発明の第４の実施の形態を図１０、図１１により説明する。本実施の形態は風向板７の先端部７ａの幅を他の部分より狭くして、先端部７ａを羽根８の外接円の近傍まで挿入できるようにしたものである。図１０は芯板９と側板１０の外形がいずれも羽根８の外接円の径より大きいターボファンの場合であり、図１１は側板１０の径が羽根８の外接円の径より大きく、芯板９の径が羽根８の外接円の径とほぼ同一なターボファンの場合である。他の部分は第１の実施の形態又は第２の実施の形態と同様である。
【００２５】
【発明の効果】
本発明によれば、高効率でエネルギー消費が少ない空気清浄装置を得ることができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態における空気清浄装置の構成を示す縦断面図である。
【図２】本発明の第１の実施の形態における空気清浄装置の構成を示す平面図である。
【図３】本発明の第１の実施の形態における空気清浄装置に用いられるターボファンの羽根車の構成を示す斜視図である。
【図４】本発明の第１の実施の形態における空気清浄装置のターボファンの翼型羽根のカシメ部を示す縦断面図である。
【図５】本発明の第１の実施の形態における空気清浄装置のターボファンの一枚板から成形した翼型羽根を示す斜視図である。
【図６】本発明の第２の実施の形態における空気清浄装置のターボファンの二枚板を接合して成形した翼型羽根を示す斜視図である。
【図７】本発明の第２の実施の形態における空気清浄装置のターボファンの二枚板を接合して成形した翼型羽根を示す斜視図である。
【図８】本発明の第３の実施の形態における空気清浄装置のターボファンの側板、芯板の外周に一体成形リングをつけた構成を示す縦断面図である。
【図９】従来のターボファンに用いられた平板から成形された羽根の形状を示す斜視図である。
【図１０】本発明の第４の実施の形態における空気清浄装置の羽根車と風向板の位置関係を示す要部縦断面図である。
【図１１】本発明の第１の実施の形態における空気清浄装置の羽根車と風向板の位置関係を示す要部縦断面図である。
【図１２】本発明の第１の実施の形態における空気清浄装置の風量−静圧（Ｑ−Ｈ）特性と風量−消費電力特性、フィルタ圧損特性の１例を示した特性図である。
【符号の説明】
１…ハウジング，１ａ…第２の面，１ｂ…側面，２…羽根車，２ａ…羽根車吹き出し口上面，２ｂ…羽根車吸込口，２ｃ…羽根車吹き出し口，３…モータ，４，４ａ…モータベース，５…フィルタ，６…ベルマウス，７…風向板，７ａ…風向板曲面部，８…翼型羽根，９…芯板，１０…側板，１１…かしめ部，１２…ボス部，１３…羽根前縁部，１４…羽根後縁部，１５…羽根接合部，１６…羽根高圧側，１７…羽根低圧側，１８…羽根挿入口，１９…羽根外周リング部，２０…羽根側板側内径，２１…羽根外径。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air purifier installed on a ceiling surface of a clean room for manufacturing semiconductors and liquid crystals, and a general apparatus using a turbofan for the purpose of improving the efficiency of a blower and reducing noise in a self-supporting clean booth and a clean bench.
[0002]
[Prior art]
Conventionally, the blades of a turbofan have a shape in which a single flat plate is curved on a two-dimensional plane as shown in FIG.
[0003]
In addition, an impeller having a large number of blades was used to obtain a necessary static pressure only with a turbofan.
[0004]
[Problems to be solved by the invention]
Conventionally, the blades of a turbofan have a shape in which a single flat plate is curved in a two-dimensional plane, so the leading edge of the blades is cut off, noise is increased by wind noise, loss is high, and fan efficiency is high. It was not obtained.
[0005]
Further, if the wind direction plate is not provided, the static pressure cannot be recovered, and a large number of blades are required to obtain the required static pressure with only the turbofan. Thus, when the number of blades increases, the flow path loss of the air flow along the blades increases as the number of blades increases.
[0006]
An object of the present invention is to provide an air purifying apparatus with high efficiency and low energy consumption.
[0007]
[Means for Solving the Problems]
The present invention, in order to solve the above problems, a turbofan having a motor for rotating the impeller and the impeller, and a bell mouth for supplying air to the suction port of the turbo fan, blown from the turbofan a filter for cleaning the air, the air cleaning apparatus that includes a housing having a pressure chamber for guiding the air blown out from the turbo fan to pressurize the filter therein, the turbofan is stored in the housing is, the housing and the motor base having an opening for blowing to supply air blown from the centrifugal impeller is fixed to the motor to the filter, and a wind direction plate that is disposed proximate to said impeller provided therein, wherein the impeller includes a blade-type blades molded from a single plate-like member and a core plate and side plates for holding the wing type blade The plate-like member is disposed at a position behind the rotation direction of the impeller and away from the edge of the airfoil blade, and the airfoil blade is disposed between the core plate and the side plate. The impeller has airfoil-shaped blades and the number of blades is 4 or less.
[0008]
The impeller includes a core plate and side plates for holding said airfoil vane and said airfoil vane, the core plate and the side plates to have a diameter larger than the outer diameter of the circumscribed circle of the tip of the airfoil blade formed is, the airfoil vane is fixed to substantially close contact with the core plate and the side plates, the tip of the wind direction plate between the circumscribed circle and the core plate and the side plate outer shape of the tip of the airfoil blade It is arranged to be positioned.
[0009]
The wind direction plate, wherein the side close to the airfoil vane is formed to have a cross-section of curved shape.
[0010]
In the air cleaning device, the turbo fan is stored in the housing, external static pressure 29.4Pa ± 10%, the mean balloon wind speed 0.3 m / sec ± 10% from the filter, the air volume 13M3 / min ± 10 %, The power consumption is 40 W ± 10%.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to FIGS. 1 to 8 and FIGS. A first embodiment of the present invention will be described with reference to FIGS. 1 to 5 and FIG.
[0013]
As shown in FIGS. 1 and 2, the air purifier of the present embodiment supplies air to the impeller 2, the turbo fan 30 having the motor 3 that rotates the impeller 2, and the suction port of the turbo fan 30. The bell mouth 6, the filter 5 for purifying the air blown from the turbo fan 30, and the housing 1 having a pressurizing chamber 40 inside for pressurizing the air blown from the turbo fan 30 and leading it to the filter 5. It is an air cleaning device provided. The turbo fan 30 is housed in the housing 1, and the housing 1 fixes the motor 3 and has a motor base 4 having an opening for supplying air blown from the impeller 2 to the filter 5, and close to the impeller 2. The impeller 2 has airfoil-shaped blades 8 and the number of blades is set to 4 or less in order to reduce the flow resistance. In the present embodiment, as shown in FIG. 3, the number of blades is three.
[0014]
In this embodiment, as shown in FIGS. 1 and 2, the wind direction plate 7 is provided on the motor base 4, and the planar direction has a length from the side surface 1b of the housing 1 to the vicinity of the impeller outlet 2c, and the height. The direction includes a wind direction plate 7 having a length from the motor base 4 to the second surface 1 a of the main body housing 1. Further, the wind direction plate 7 has a curved cross section on the side close to the airfoil blade 8, and the air blown out from the impeller flows into the pressure chamber at an obtuse angle to restore the static pressure at the outer periphery of the turbofan 30. Let Thereby, the amount of air blown out from the filter 5 can be increased.
[0015]
As shown in FIG. 3, the impeller 2 includes a wing blade 8, and a core plate 9 and a side plate 10 that hold the wing blade 8. The core plate 9 and the side plate 10 are formed to have an outer diameter larger than the diameter of the circumscribed circle at the tip of the airfoil blade 8. The tip 7 a of the wind direction plate 7 is disposed so as to be positioned between the circumscribed circle of the tip of the airfoil blade 8 and the outer shape of the core plate 9 and the side plate 10. That is, the tip 7 a of the wind direction plate 7 is provided at a position that enters inside the outer peripheral edges of the core plate 9 and the side plate 10 and does not contact the tip of the wing blade 8. In order to improve the workability of assembling the turbo fan 30, the outer diameter of the side plate 10 of the impeller 2 is larger than the outer diameter of the blade 8, and the outer diameter of the core plate 9 is substantially the same as the outer diameter of the blade 8. When the vehicle 2 is assembled, the tip 7 a of the wind direction plate 7 does not contact the core plate 9, so that the impeller 2 can be easily attached to the motor 3.
[0016]
The airfoil blade 8 is fixed between the core plate 9 and the side plate 10 so as to be substantially in close contact. As a specific fixing method, as shown in FIGS. 3 to 5, the wing-shaped blade 8 is fixed to the core plate 9 and the side plate 10 by caulking. The wing type blade 8 is provided with a caulking portion 11 for caulking and fixing so as to protrude to the side facing the core plate 9 and the side plate 10, while the caulking portion 11 is inserted into the core plate 9 and the side plate 10. A blade insertion portion 18 that is perforated is provided. The caulking portion 11 is inserted into the blade inserting portion 18 so that the gaps between the airfoil blade 8 and the core plate 9 and the side plate 10 are reduced and are in close contact with each other, and the caulking portion 11 is bent and caulked. As a result, the airfoil blade 8, the core plate 9 and the side plate 10 are fixed. FIG. 4 shows a longitudinal section in a state where the caulking portion 11 is caulked. As shown in the figure, the caulking portion 11 is bent toward the inside of the airfoil blade 8, thereby reducing a gap outside the blade insertion portion 18, and the airfoil blade 8, the core plate 9, the side plate 10, and the like. Substantially adheres to each other, and air leakage from the caulking portion is prevented. The blade insertion portion 18 is provided in accordance with the blade shape, and the caulking portion 11 is alternately provided on the high-pressure side and low-pressure side blades and is bent toward the inside of the blade, so that the blade 8, the core plate 9, and the side plate 10. The gap between the mating surfaces is reduced, the contact state is substantially reached, loss due to air leakage can be reduced, and the efficiency of the turbofan 30 can be improved.
[0017]
FIG. 5 shows an example in which the airfoil blade 8 is formed from a single plate-like member. A plate-shaped member is formed to form an airfoil blade 8 having an airfoil cross section and curved surfaces on the blade high pressure side 16 and the blade low pressure side 17. The blade leading edge portion 13 has an effect that the plate-like member is formed in a curved surface shape to smooth the air inflow path, thereby improving fan efficiency and reducing noise. On the other hand, the blade trailing edge 14 is fixed by spot welding or the like with the end of the plate-like member connected to an acute angle. A caulking portion 11 is provided so as to protrude from an end portion of the airfoil blade 8 extending from the blade leading edge portion 13 to the blade trailing edge portion 14. In FIG. 5, the caulking portion 11 is already bent, but before the blade type blade 8 is inserted into the blade insertion portion 18 of the core plate 9 and the side plate 10, the blade high pressure side 16 or the blade low pressure side 17 is placed. It protrudes from the end at the continuous surface.
[0018]
The air purifying apparatus of the present embodiment is installed on a system ceiling grid of 600 mm in length and 1200 mm in width assembled on the ceiling surface of the clean room. As an example of the specification, the motor 3 is a three-phase 200 V 50 Hz induction motor with a rated output of 26 W, and the turbo fan 30 includes an impeller 2 having a blade outer diameter φ340 and three blade-type blades 8 and the motor 3. The filter 5 is a high-performance filter having a rated pressure loss of 10.5 mmAq or less (average 9.5 mmAq) when the rated air volume is 18.5 m 3 / min. The kicking characteristics of this combination are as shown in FIG. 12, and the average wind speed of 0.3 m / sec into the clean room downstream of the filter 5 when the external static pressure around the suction port is 29.4 Pa (3 mmAq). The power consumption when operating at an air flow of 13 m 3 / min is 40 W. At this time, the noise is 43 to 42 dB. The tolerance of the specifications is that the air volume is about ± 10% and the power consumption is about ± 10% due to variations in filter pressure loss and the accuracy of parts such as motors and fans.
[0019]
A second embodiment of the present invention will be described with reference to FIGS.
[0020]
In the present embodiment, the impeller 2 is constituted by an airfoil blade 8 formed by joining a plurality of plate-shaped members, and a core plate 9 and a side plate 10 that hold the airfoil blade 8. . Other configurations are the same as those of the first embodiment. In the present embodiment, the airfoil blade 8 is formed by joining two plate-like members. One of the two plate-like members is the blade high pressure side 16 and the other is the blade low pressure side 17. The two plate-like members are formed into a shape having an airfoil cross section in a combined state, and the airfoil blades 8 having curved surfaces on the blade high pressure side 16 and the blade low pressure side 17 are formed by the combination. A blade leading edge portion 13 is formed on the blade high-pressure side 16, and the blade leading edge portion 13 has an effect that the plate-like member is formed in a curved surface shape to smooth the air inflow path. The blade low pressure side 17 is formed in a shape such that the blade leading edge 13 is removed from the blade high pressure side 16. The two plate-like members are joined to the blade low pressure side 17 and the blade high pressure side 16 after being formed. The joint 15 between the blade high-pressure side 16 and the blade low-pressure side 17 is at the rear side in the rotational direction of the impeller 2, that is, the blade low-pressure side that is at a low pressure during rotation, and at least the blade blade from the leading edge 13 of the blade blade. It is arranged at a position separated by more than the maximum thickness. The joining portion 15 has such a smoothness that the air flow is not separated, and the joining surface is joined in a state of being substantially parallel to the blade leading edge portion 13 and inclined to the blade trailing edge portion 14. Also in this embodiment, fan efficiency can be improved and noise can be reduced as in the first embodiment.
[0021]
On the other hand, the blade trailing edge portion 14 is fixed by spot welding or the like, with the blade high pressure side 16 and the blade low pressure side 17 end portions connected at an acute angle. A caulking portion 11 is provided so as to protrude from an end portion of the airfoil blade 8 extending from the blade leading edge portion 13 to the blade trailing edge portion 14. 6 and 7, the caulking portion 11 is already bent, but before the blade type blade 8 is inserted into the blade insertion portion 18 of the core plate 9 and the side plate 10, the blade high pressure side 16 or the blade low pressure is shown. It protrudes from the end at the surface continuous to the side 17.
[0022]
Also in the present embodiment, the blade insertion portion 18 is provided according to the shape of the blade, and the caulking portion 11 is alternately provided on the high-pressure side and low-pressure side blades and is bent toward the inside of the blade. The gap between the mating surfaces of the core plate 9 and the side plate 10 is reduced, the contact state is substantially increased, loss due to air leakage can be reduced, and the efficiency of the turbo fan 30 can be improved.
[0023]
A third embodiment of the present invention will be described with reference to FIG. In this embodiment, in order to reinforce the core plate 9 and the side plate 10 of the impeller 2, an integrally formed ring 19 is provided on the outer peripheral portion of the core plate 9. As shown in FIG. 8, the impeller 2 of the present embodiment has an inner-outer diameter ratio (D1s / D2s) between the side plate-side inner diameter D1s and the blade outer diameter D2s of the airfoil blade 8 of 0.59 to 0.76. Set to range. Other configurations are the same as those of the first embodiment or the second embodiment.
[0024]
A fourth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the width of the tip portion 7a of the wind direction plate 7 is made narrower than the other portions so that the tip portion 7a can be inserted to the vicinity of the circumscribed circle of the blade 8. 10 shows a case of a turbofan in which the outer shape of the core plate 9 and the side plate 10 is larger than the diameter of the circumscribed circle of the blade 8, and FIG. 11 shows that the diameter of the side plate 10 is larger than the diameter of the circumscribed circle of the blade 8. This is a case of a turbofan in which the diameter of 9 is substantially the same as the diameter of the circumscribed circle of the blade 8. Other parts are the same as those in the first embodiment or the second embodiment.
[0025]
【The invention's effect】
According to the present invention, it is possible to obtain an air cleaning device with high efficiency and low energy consumption.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a configuration of an air cleaning device according to a first embodiment of the present invention.
FIG. 2 is a plan view showing the configuration of the air cleaning device according to the first embodiment of the present invention.
FIG. 3 is a perspective view showing a configuration of an impeller of a turbofan used in the air cleaning device according to the first embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a caulking portion of a wing blade of a turbofan of the air cleaning device according to the first embodiment of the present invention.
FIG. 5 is a perspective view showing airfoil blades formed from a single plate of a turbofan of the air cleaning device according to the first embodiment of the present invention.
FIG. 6 is a perspective view showing an airfoil blade formed by joining two turbofan two plates of an air cleaning device according to a second embodiment of the present invention.
FIG. 7 is a perspective view showing an airfoil blade formed by joining two turbofan two plates of an air cleaning device according to a second embodiment of the present invention.
FIG. 8 is a longitudinal sectional view showing a configuration in which an integrally molded ring is attached to the outer periphery of a side plate and a core plate of a turbofan of an air cleaning device according to a third embodiment of the present invention.
FIG. 9 is a perspective view showing the shape of a blade formed from a flat plate used in a conventional turbofan.
FIG. 10 is a longitudinal sectional view of a main part showing a positional relationship between an impeller and a wind direction plate of an air cleaning device according to a fourth embodiment of the present invention.
FIG. 11 is a longitudinal sectional view of the main part showing the positional relationship between the impeller and the wind direction plate of the air cleaning device according to the first embodiment of the present invention.
FIG. 12 is a characteristic diagram showing an example of an air volume-static pressure (QH) characteristic, an air volume-power consumption characteristic, and a filter pressure loss characteristic of the air cleaning device according to the first embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Housing, 1a ... 2nd surface, 1b ... Side surface, 2 ... Impeller, 2a ... Impeller blower upper surface, 2b ... Impeller inlet, 2c ... Impeller blowout, 3 ... Motor, 4, 4a ... Motor base, 5 ... Filter, 6 ... Bell mouth, 7 ... Wind direction plate, 7a ... Wind direction plate curved surface portion, 8 ... Wing blade, 9 ... Core plate, 10 ... Side plate, 11 ... Caulking portion, 12 ... Boss portion, 13 ... blade leading edge, 14 ... blade trailing edge, 15 ... blade joint, 16 ... blade high pressure side, 17 ... blade low pressure side, 18 ... blade insertion port, 19 ... blade outer ring, 20 ... blade side plate side inner diameter , 21 ... The outer diameter of the blade.

Claims

A turbofan having a motor for rotating the impeller and the impeller,
A bell mouth for supplying air to the suction port of the turbo fan,
A filter for cleaning the air blown from the turbofan,
In the air cleaning apparatus that includes a housing having a pressure chamber for guiding the air blown out from the turbo fan to pressurize the filter therein,
The turbofan is stored in the housing,
The housing is to fix the motor, the motor base having an opening for blowing to supply air blown from the impeller to the filter, and a wind direction plate that is disposed proximate to said impeller Prepare for the inside,
The impeller includes an airfoil blade formed from a single plate-like member, a core plate and a side plate for holding the airfoil blade,
The joint part of the plate-like member is arranged on the rear side with respect to the rotation direction of the impeller and at a position away from the edge of the wing blade,
Fixing the airfoil blade in close contact with the core plate and the side plate,
The impeller has airfoil-shaped blades, and the number of blades is 4 or less.

The impeller includes a core plate and side plates for holding said airfoil vane and said airfoil vane, the core plate and the side plates to have a diameter larger than the outer diameter of the circumscribed circle of the tip of the airfoil blade formed is, the airfoil vane is fixed to substantially close contact with the core plate and the side plates, the tip of the wind direction plate between the circumscribed circle and the core plate and the side plate outer shape of the tip of the airfoil blade The air purifier according to claim 1, wherein the air purifier is disposed so as to be positioned.

The wind direction plate, the air cleaning apparatus according to claim 1, wherein the side close to the airfoil vane is formed to have a cross-section of curved shape.

In the air cleaning device,
The turbofan is housed in the housing and consumes power when the external static pressure is 29.4 Pa ± 10%, the average blown air velocity from the filter is 0.3 m / sec ± 10%, and the air volume is 13 m3 / min ± 10%. The air purifier according to claim 1, wherein the air purifier is configured to be 40 W ± 10%.