JP3843928B2

JP3843928B2 - Centrifugal blower

Info

Publication number: JP3843928B2
Application number: JP2002300282A
Authority: JP
Inventors: 健二石田; 利徳落合; 伊藤　　功治
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2002-10-15
Filing date: 2002-10-15
Publication date: 2006-11-08
Anticipated expiration: 2022-10-15
Also published as: JP2004132342A

Description

【０００１】
【発明の属する技術分野】
本発明は、内気と外気とを区分して同時に吸入することができる内外気二層流式の車両用空調装置に適用される遠心式送風機に関するものである。
【０００２】
【従来の技術】
内外気二層流式車両用空調装置用の遠心式送風機として、特開平２０００−２０３２３５号公報に記載の発明では、仕切板を設けて遠心ファンから吹き出した２種類の空気が混合することを防止している。
【０００３】
【発明が解決しようとする課題】
しかし、遠心ファンは、回転軸方向一端側から吸入した空気を径外方側に向けて吹き出すものであるので、図６に示すように、仕切板３３より上方側を流れてブレード２１間に吸入された空気の一部は、流通方向が転向する際に自身に作用する慣性力により、仕切板３３より下方側に吹き出してしまう。
【０００４】
このため、例えば内気と外気との風量割合を１：１に設定すべく、仕切板３３をブレード２１の長手方向略中央部に設けても、内気と外気との風量割合が１：１にならないという問題が発生する。
【０００５】
本発明は、上記点に鑑み、第１には、従来と異なる新規な遠心式送風機を提供し、第２には、内気と外気との風量割合を適切にすることができる構造を有する遠心式送風機を提供を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明は、上記目的を達成するために、請求項１に記載の発明では、車室内空気及び車室外空気を区分して同時に吸入することができる内外気二層流式の車両用空調装置に適用される遠心式送風機であって、回転軸（ＣＬ）周りに配設された複数枚のブレード（２１）を有し、軸方向一端側から吸入した空気を径外方側に向けて吹き出す遠心ファン（２０）と、軸方向一端側に吸入口（３４）を有して遠心ファン（２０）を収納するとともに、遠心ファン（２０）から吹き出した空気を集合させる渦巻き状の空気通路を構成するスクロールケーシング（３０）と、スクロールケーシング（３０）内に設けられ、空気通路内を軸方向一端側の第１空気通路（３１）と他端側の第２空気通路（３２）とに仕切る仕切板（３３）と、遠心ファン（２０）の内径側に設けられ、前記吸入口（３４）から前記遠心ファン（２０）に至る吸入通路を２つに仕切る略円筒状の分離筒（４７）とを備え、
前記分離筒（４７）の軸方向端部のうち前記遠心ファン（２０）側の端部（４７ａ）は、軸方向において前記仕切板（３３）より前記吸入口（３４）側にずれていることを特徴とする。
【０００７】
これにより、ずれ量を適切な値とすることにより適切な位置及び方向に吸気流れを転向させることができるので、内気と外気との風量割合を適切にすることが可能となるとともに、従来と異なる新規な遠心式送風機を得ることができる。
【０００８】
請求項２に記載の発明では、車室内空気及び車室外空気を区分して同時に吸入することができる内外気二層流式の車両用空調装置に適用される遠心式送風機であって、
回転軸（ＣＬ）周りに配設された複数枚のブレード（２１）を有し、軸方向一端側から吸入した空気を径外方側に向けて吹き出す遠心ファン（２０）と、
軸方向一端側に吸入口（３４）を有して遠心ファン（２０）を収納するとともに、遠心ファン（２０）から吹き出した空気を集合させる渦巻き状の空気通路を構成するスクロールケーシング（３０）と、
スクロールケーシング（３０）内に設けられ、空気通路内を軸方向一端側の第１空気通路（３１）と他端側の第２空気通路（３２）とに仕切る仕切板（３３）と、
遠心ファン（２０）の内径側に設けられ、吸入口（３４）から遠心ファン（２０）に至る吸入通路を２つに仕切る略円筒状の分離筒（４７）と、
遠心ファン（２０）から吹き出す空気を軸方向一端側の流れと他端側の流れとに仕切る分離板（２４）とを備え、
分離筒（４７）の軸方向端部のうち遠心ファン（２０）側の端部（４７ａ）と仕切板（３３）とは、互いに軸方向にずれているとともに、分離板（２４）は、軸方向において仕切板（３３）より吸入口（３４）側にずれていることを特徴とする。
請求項２に記載の発明においても請求項１と同様の作用効果を発揮できる。
請求項３に記載の発明では、車室内空気及び車室外空気を区分して同時に吸入することができる内外気二層流式の車両用空調装置に適用される遠心式送風機であって、
回転軸（ＣＬ）周りに配設された複数枚のブレード（２１）を有し、軸方向一端側から吸入した空気を径外方側に向けて吹き出す遠心ファン（２０）と、
軸方向一端側に吸入口（３４）を有して遠心ファン（２０）を収納するとともに、遠心ファン（２０）から吹き出した空気を集合させる渦巻き状の空気通路を構成するスクロールケーシング（３０）と、
スクロールケーシング（３０）内に設けられ、空気通路内を軸方向一端側の第１空気通路（３１）と他端側の第２空気通路（３２）とに仕切る仕切板（３３）と、
遠心ファン（２０）の内径側に設けられ、吸入口（３４）から遠心ファン（２０）に至る吸入通路を２つに仕切る略円筒状の分離筒（４７）と、
遠心ファン（２０）から吹き出す空気を軸方向一端側の流れと他端側の流れとに仕切る分離板（２４）とを備え、
分離筒（４７）の軸方向端部のうち遠心ファン（２０）側の端部（４７ａ）は、仕切板（３３）および分離板（２４）の両方と互いに軸方向にずれているとともに、分離板（２４）と仕切板（３３）とは、互いに軸方向にずれていることを特徴とする。
請求項３に記載の発明においても請求項１、２と同様の作用効果を発揮できる。
請求項４に記載の発明では、車室内空気及び車室外空気を区分して同時に吸入することができる内外気二層流式の車両用空調装置に適用される遠心式送風機であって、
回転軸（ＣＬ）周りに配設された複数枚のブレード（２１）を有し、軸方向一端側から吸入した空気を径外方側に向けて吹き出す遠心ファン（２０）と、
軸方向一端側に吸入口（３４）を有して遠心ファン（２０）を収納するとともに、遠心ファン（２０）から吹き出した空気を集合させる渦巻き状の空気通路を構成するスクロールケーシング（３０）と、
スクロールケーシング（３０）内に設けられ、空気通路内を軸方向一端側の第１空気通路（３１）と他端側の第２空気通路（３２）とに仕切る仕切板（３３）と、
遠心ファン（２０）の内径側に設けられ、吸入口（３４）から遠心ファン（２０）に至る吸入通路を２つに仕切る略円筒状の分離筒（４７）と、
遠心ファン（２０）から吹き出す空気を軸方向一端側の流れと他端側の流れとに仕切る分離板（２４）とを備え、
分離筒（４７）の軸方向端部のうち遠心ファン（２０）側の端部（４７ａ）と仕切板（３３）とは、互いに軸方向にずれているとともに、
分離板（２４）と仕切板（３３）とは、互いに軸方向にずれており、
さらに、分離筒（４７）の軸方向端部のうち遠心ファン（２０）側の端部（４７ａ）は、軸方向において分離板（２４）より吸入口（３４）側にずれていることを特徴とする。
請求項４に記載の発明においても請求項１、２、３と同様の作用効果を発揮できる。
【００１２】
請求項５に記載の発明では、請求項２ないし４のいずれか１つに記載の遠心式送風機において、分離筒（４７）の軸方向端部のうち遠心ファン（２０）側の端部（４７ａ）は、軸方向において仕切板（３３）より吸入口（３４）側にずれていることを特徴とする。
【００１５】
請求項６に記載の発明では、請求項３または４に記載の遠心式送風機において、分離板（２４）は、軸方向において仕切板（３３）より吸入口（３４）側にずれていることを特徴とする。
【００２１】
因みに、上記各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示す一例である。
【００２２】
【発明の実施の形態】
（第１実施形態）
図１は本実施形態に係る内外気二層流式車両用空調装置用遠心式送風機１の模式図であり、図２は図１のＡ部拡大図である。
【００２３】
なお、遠心式送風機１の空気流れ下流側に接続される空調ケーシング内には、蒸発器、ヒータコア、及びエアミックスドア等の空気温度を調節する機器が配設されている。
【００２４】
図１中、電動式のモータ１０は遠心ファン２０を回転させる駆動手段であり、遠心ファン２０は、回転軸ＣＬ周りに配設された複数枚のブレード２１を有して軸方向一端側から吸入した空気を径外方側に向けて吹き出す羽根車である。なお、モータ１０はモータハウジング外周に設けられたフランジ１１を介して、後述するスクロールケーシング３０に固定されている。
【００２５】
ハブ２２は遠心ファン２０にモータ１０の回転力を伝達する羽根車主板であり、第１ラジアルバンド２４は、ブレード２１の長手方向略中央部に設けられて遠心ファン２０から吹き出す空気を軸方向一端側の流れと他端側の流れとに仕切るととにも、遠心ファン２０の補強部材をなす環板状の分離板であり、第２ラジアルバンド２５は、ブレード２１長手方向端部のうちハブ２２と反対側に配置されて遠心ファン２０の補強部材を構成する環板状のものである。
【００２６】
なお、ブレード２１、ハブ２２及び第１、２ラジアルバンド２４、２５は、樹脂にて一体成形されており、本実施形態では、型抜き方向が回転軸ＣＬ方向と一致するように成形している。
【００２７】
スクロールケーシング３０は、遠心ファン２０を収納するとともに、遠心ファン２０から吹き出した空気を集合させる空気通路を構成するものであり、この空気通路内には、空気通路内を軸方向一端側の第１空気通路３１と他端側の第２空気通路３２とに仕切る仕切板３３が設けられている。
【００２８】
また、スクロールケーシング３０は遠心ファン２０周りに渦巻き状に形成されたものであり、本実施形態では、第１、２空気通路３１、３２の通路断面積が、巻き角に対して対数螺旋関数的に増大するように設定されており、軸方向一端側、本実施形態では、モータ１０と反対側には遠心ファン２０に吸引される空気が流れる吸入口３４が設けられている。
【００２９】
そして、仕切板３３と第１ラジアルバンド２４とは、軸方向において第１ラジアルバンド２４が仕切板３３より吸入口３４側に位置するように互いに軸方向にずれている。なお、以下、遠心ファン２０のうち第１ラジアルバンド２４より吸入口３４側の第１ファン２０ａと呼び、第１ラジアルバンド２４よりモータ１０側を第２ファン２０ｂと呼ぶ。
【００３０】
また、遠心式送風機１に導入する空気を選択する内外気切換ユニット４０は、室内空気を導入する内気導入口４１、４２、室外空気を導入する外気導入口４３、４４、内気導入口４１と外気導入口４３とを切換開閉する第１内外気切換ドア４５、及び内気導入口４２と外気導入口４４とを切換開閉する第２内外気切換ドア４６を有している。
【００３１】
なお、内外気切換ユニット４０は、ボルトやビス等の機械的な締結手段により遠心式送風機１に一体化されている。
【００３２】
また、遠心ファン２０の内径側には、吸入口３４から遠心ファン２０に至る吸入通路を２つに仕切ることにより、この吸入通路を第１ファン２０ａに吸い込まれる空気が流れる通路と第２ファン２０ｂに吸い込まれる空気が流れる通路とを仕切る略円筒状の分離筒４７が配設されており、本実施形態では、分離筒４７は内外気切換ユニット４０に一体成形されている。
【００３３】
そして、分離筒４７の軸方向端部のうち遠心ファン２０側の端部４７ａは、フレア状（ラッパ状）に拡がっているとともに、軸方向において仕切板３３より吸入口３４側に位置するように仕切板３３に対して軸方向にずれ、かつ、軸方向において第１ラジアルバンド２４より吸入口３４側に位置するように第１ラジアルバンド２４に対して軸方向にずれている。
【００３４】
また、ダッシュボード５０は室内と室外（エンジンルーム）とを区画する区画壁であり、吸入口３４の外縁部には、フレア状に形成されたベルマウス３５が設けられてる。
【００３５】
次に、本実施形態の作用効果を述べる。
【００３６】
遠心ファン２０では、前述のごとく、回転軸方向一端側から吸入した空気を径外方側に向けて吹き出すものであるので、流通方向が軸方向から径方向に転向する際に自身に作用する慣性力により、実際に転向する位置が、本来、転向するべき位置からずれてしまう。
【００３７】
これに対して、本実施形態では、仕切板３３に対して第１ラジアルバンド２４及び分離筒４７の遠心ファン２０側端部４７ａが軸方向にずれているので、このずれ量を適切な値とすることにより適切な位置及び方向に吸気流れを転向させることができる。
【００３８】
つまり、本実施形態では、第１ファン２０ａから吹き出す風量と第２ファン２０ｂから吹き出す風量との風量割合を１：１に設定すべく、仕切板３３を軸方向において略中央部に配置するとともに、遠心ファン２０に吸引される空気の慣性力を考量して、第１ラジアルバンド２４及び分離筒４７を仕切板３３に対して吸入口３４側にずらしている。
【００３９】
なお、仕切板３３に対する第１ラジアルバンド２４及び分離筒４７の遠心ファン２０側端部４７ａのずれ量は、遠心ファン２０の回転数及び吸入口３４の開口面積等に基づいて適宜決定されるものである。
【００４０】
（第２実施形態）
本実施形態は、図３に示すように、第１ラジアルバンド２４を廃止したものである。
【００４１】
なお、本実施形態では、図４に示す試験結果に基づいて仕切板３３に対する分離筒４７の遠心ファン２０側端部４７ａのずれ量ｈを２０ｍｍとしている。
【００４２】
（第３実施形態）
本実施形態は、図５に示すように、仕切板３３に対して第１ラジアルバンド２４のみをずらし、分離筒４７の遠心ファン２０側端部４７ａは仕切板３３と一致させたものである。
【００４３】
（その他の実施形態）
上述の実施形態では、第１ラジアルバンド２４は、遠心ファン２０の外形縁より内側に位置してブレード２１間の隙間を２つに仕切って遠心ファン２０から吹き出す空気を軸方向一端側の流れと他端側の流れとに区画していたが、本発明はこれに限定されるものではなく、遠心ファン２０の外形縁から外方側に突出するように設けてもよい。
【００４４】
また、上述の実施形態では、遠心ファン２０の外側にモータ１０が配置されていたが、本発明はこれに限定されるものではなく、遠心ファン２０の内側にモータ１０を配置してもよい。
【００４５】
また、上述の実施形態では、第１ファン２０ａの内径と第２ファン２０ｂの内径とは同一であったが、本発明はこれに限定されるものではなく、例えば第１ファン２０ａの内径が第２ファン２０ｂの内径より大きくなるように両者を相違させてもよい。
【００４６】
上述の実施形態では、第１ファン２０ａから吹き出す風量と第２ファン２０ｂから吹き出す風量との風量割合を１：１に設定したが、本発明はこれに限定されるものではない。したがって、設定風量割合によっては、第１ラジアルバンド２４及び分離筒４７の遠心ファン２０側端部４７ａが仕切板３３に対してモータ１０側にずれる場合もあり得る。
【００４７】
また、上述の実施形態では、第１ラジアルバンド２４の幅寸法は、ブレード２１の幅寸法より小さかったが、これは製造上の利用であり、理想的には、第１ラジアルバンド２４の幅寸法とレード２１の幅寸法とを同一とすることが望ましい。
【図面の簡単な説明】
【図１】本発明の実施形態に係る内外気二層流式車両用空調装置用遠心式送風機の模式図である。
【図２】図１のＡ部拡大図である。
【図３】本発明の第２実施形態に係る内外気二層流式車両用空調装置用遠心式送風機の模式図である。
【図４】風量割合を示すグラフである。
【図５】本発明の第３実施形態に係る内外気二層流式車両用空調装置用遠心式送風機の模式図である。
【図６】従来の技術に係る内外気二層流式車両用空調装置用遠心式送風機の模式図である。
【符号の説明】
２０…遠心ファン、２１…ブレード、２２…ハブ、
２４…第１ラジアルバンド、２５…第２ラジアルバンド、
３０…スクロールケーシング、３３…仕切板、４７…分離筒。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centrifugal blower applied to an air-conditioner for a two-layer flow type vehicle that can separate and suck in air and outside air at the same time.
[0002]
[Prior art]
In the invention described in Japanese Patent Laid-Open No. 2000-203235 as a centrifugal blower for an air-conditioner for a two-layer flow type vehicle inside / outside air, a partition plate is provided to prevent the two types of air blown out from the centrifugal fan from mixing. is doing.
[0003]
[Problems to be solved by the invention]
However, since the centrifugal fan blows out the air sucked from one end side in the rotation axis direction toward the radially outward side, the air flows between the blades 21 by flowing above the partition plate 33 as shown in FIG. A part of the air thus blown out downward from the partition plate 33 due to an inertial force acting on itself when the flow direction changes.
[0004]
For this reason, for example, even if the partition plate 33 is provided at a substantially central portion in the longitudinal direction of the blade 21 in order to set the air volume ratio between the inside air and the outside air to 1: 1, the air volume ratio between the inside air and the outside air does not become 1: 1. The problem occurs.
[0005]
In view of the above points, the present invention firstly provides a novel centrifugal blower different from the conventional one, and secondly, a centrifugal type having a structure capable of making the air volume ratio between the inside air and the outside air appropriate. The purpose is to provide a blower.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a two-layer flow type vehicle air conditioner that can separate and simultaneously inhale vehicle interior air and vehicle exterior air. A centrifugal blower to be applied, which has a plurality of blades (21) arranged around a rotation axis (CL) and blows out air sucked from one end in the axial direction toward the radially outward side. The fan (20) has a suction port (34) on one end side in the axial direction, houses the centrifugal fan (20), and forms a spiral air passage for collecting air blown from the centrifugal fan (20). A partition plate provided in the scroll casing (30) and the scroll casing (30) and partitioning the inside of the air passage into a first air passage (31) on one end side in the axial direction and a second air passage (32) on the other end side. and (33), a centrifugal fan (2 ) Formed in the inner diameter side of, and a substantially cylindrical separating cylinder (47) which divides into two inlet passages leading the the centrifugal fan (20) from said inlet (34),
Of the axial end portions of the separation cylinder (47), the end portion (47a) on the centrifugal fan (20) side is displaced in the axial direction from the partition plate (33) to the suction port (34) side. It is characterized by.
[0007]
Thereby, since the intake flow can be turned to an appropriate position and direction by setting the deviation amount to an appropriate value, it becomes possible to make the air volume ratio between the inside air and the outside air appropriate and different from the conventional one. A novel centrifugal blower can be obtained.
[0008]
The invention according to claim 2 is a centrifugal blower applied to an air-conditioner for a vehicle with a two-layer flow of inside and outside air that can separate and simultaneously suck the cabin air and the cabin outside air,
A centrifugal fan (20) having a plurality of blades (21) arranged around the rotation axis (CL) and blowing out the air sucked from one axial end side toward the radially outer side;
A scroll casing (30) having a suction port (34) on one end side in the axial direction for housing the centrifugal fan (20) and forming a spiral air passage for collecting air blown from the centrifugal fan (20); ,
A partition plate (33) provided in the scroll casing (30) and partitioning the inside of the air passage into a first air passage (31) on one end side in the axial direction and a second air passage (32) on the other end side;
A substantially cylindrical separation tube (47) provided on the inner diameter side of the centrifugal fan (20) and dividing the suction passage from the suction port (34) to the centrifugal fan (20) into two;
A separation plate (24) for partitioning air blown from the centrifugal fan (20) into a flow on one end side in the axial direction and a flow on the other end side;
Among the axial ends of the separation cylinder (47), the end (47a) on the centrifugal fan (20) side and the partition plate (33) are offset from each other in the axial direction, and the separation plate (24) It is characterized by being displaced in the direction from the partition plate (33) toward the suction port (34).
In the invention according to claim 2, the same effect as that of claim 1 can be exhibited.
The invention according to claim 3 is a centrifugal blower applied to an air-conditioner for a vehicle with a two-layer flow of inside and outside air that can separate and simultaneously suck the cabin air and the cabin outside air,
A centrifugal fan (20) having a plurality of blades (21) arranged around the rotation axis (CL) and blowing out the air sucked from one axial end side toward the radially outer side;
A scroll casing (30) having a suction port (34) on one end side in the axial direction for housing the centrifugal fan (20) and forming a spiral air passage for collecting air blown from the centrifugal fan (20); ,
A partition plate (33) provided in the scroll casing (30) and partitioning the inside of the air passage into a first air passage (31) on one end side in the axial direction and a second air passage (32) on the other end side;
A substantially cylindrical separation tube (47) provided on the inner diameter side of the centrifugal fan (20) and dividing the suction passage from the suction port (34) to the centrifugal fan (20) into two;
A separation plate (24) for partitioning air blown from the centrifugal fan (20) into a flow on one end side in the axial direction and a flow on the other end side;
Of the axial ends of the separation cylinder (47), the end (47a) on the centrifugal fan (20) side is axially displaced from both the partition plate (33) and the separation plate (24) and separated. The plate (24) and the partition plate (33) are characterized by being offset from each other in the axial direction .
Also in the invention of the third aspect, the same effect as that of the first and second aspects can be exhibited.
The invention according to claim 4 is a centrifugal blower applied to an air-conditioner for a vehicle with a two-layer flow of inside and outside air capable of classifying and simultaneously sucking the cabin air and the cabin outside air,
A centrifugal fan (20) having a plurality of blades (21) arranged around the rotation axis (CL) and blowing out the air sucked from one axial end side toward the radially outer side;
A scroll casing (30) having a suction port (34) on one end side in the axial direction for housing the centrifugal fan (20) and forming a spiral air passage for collecting air blown from the centrifugal fan (20); ,
A partition plate (33) provided in the scroll casing (30) and partitioning the inside of the air passage into a first air passage (31) on one end side in the axial direction and a second air passage (32) on the other end side;
A substantially cylindrical separation tube (47) provided on the inner diameter side of the centrifugal fan (20) and dividing the suction passage from the suction port (34) to the centrifugal fan (20) into two;
A separation plate (24) for partitioning air blown from the centrifugal fan (20) into a flow on one end side in the axial direction and a flow on the other end side;
Among the axial ends of the separation cylinder (47), the end (47a) on the centrifugal fan (20) side and the partition plate (33) are offset in the axial direction from each other,
The separation plate (24) and the partition plate (33) are offset from each other in the axial direction.
Further, the end (47a) on the centrifugal fan (20) side of the axial end of the separation cylinder (47) is shifted from the separation plate (24) toward the suction port (34) in the axial direction. And
In the invention according to the fourth aspect, the same function and effect as those of the first, second, and third aspects can be exhibited.
[0012]
According to a fifth aspect of the present invention, in the centrifugal blower according to any one of the second to fourth aspects, the end (47a) on the centrifugal fan (20) side of the axial end of the separation cylinder (47). ) Is shifted from the partition plate (33) toward the suction port (34) in the axial direction.
[0015]
According to a sixth aspect of the present invention, in the centrifugal blower according to the third or fourth aspect, the separation plate (24) is shifted in the axial direction from the partition plate (33) toward the suction port (34). Features.
[0021]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a schematic view of a centrifugal blower 1 for an air-conditioner for a two-layer air flow type vehicle according to the present embodiment, and FIG. 2 is an enlarged view of a portion A in FIG.
[0023]
In the air conditioning casing connected to the downstream side of the air flow of the centrifugal blower 1, devices for adjusting the air temperature such as an evaporator, a heater core, and an air mix door are disposed.
[0024]
In FIG. 1, an electric motor 10 is a driving means for rotating a centrifugal fan 20, and the centrifugal fan 20 has a plurality of blades 21 disposed around a rotation axis CL and sucks from one end in the axial direction. It is an impeller which blows off the air which went toward the diameter outward side. The motor 10 is fixed to a scroll casing 30 described later via a flange 11 provided on the outer periphery of the motor housing.
[0025]
The hub 22 is an impeller main plate that transmits the rotational force of the motor 10 to the centrifugal fan 20, and the first radial band 24 is provided at a substantially central portion in the longitudinal direction of the blade 21, and discharges air blown from the centrifugal fan 20 in one axial direction. The second radial band 25 is a hub of the longitudinal ends of the blade 21 and is divided into a flow on the other side and a flow on the other end. 22 is an annular plate-like member that is disposed on the opposite side to 22 and constitutes the reinforcing member of the centrifugal fan 20.
[0026]
Note that the blade 21, the hub 22, and the first and second radial bands 24 and 25 are integrally formed of resin, and in this embodiment, the die cutting direction is formed so as to coincide with the rotation axis CL direction. .
[0027]
The scroll casing 30 houses the centrifugal fan 20 and constitutes an air passage that collects the air blown out from the centrifugal fan 20. The air passage includes a first air passage on the first axial end side in the air passage. A partition plate 33 that partitions the air passage 31 and the second air passage 32 on the other end side is provided.
[0028]
Further, the scroll casing 30 is formed in a spiral shape around the centrifugal fan 20, and in this embodiment, the passage cross-sectional areas of the first and second air passages 31 and 32 are logarithmic spiral functions with respect to the winding angle. A suction port 34 through which air sucked by the centrifugal fan 20 flows is provided on one end side in the axial direction, in the present embodiment, on the side opposite to the motor 10.
[0029]
The partition plate 33 and the first radial band 24 are offset from each other in the axial direction so that the first radial band 24 is positioned closer to the suction port 34 than the partition plate 33 in the axial direction. Hereinafter, the centrifugal fan 20 is referred to as a first fan 20a on the suction port 34 side from the first radial band 24, and the motor 10 side from the first radial band 24 is referred to as a second fan 20b.
[0030]
The inside / outside air switching unit 40 for selecting the air to be introduced into the centrifugal blower 1 includes the inside air introduction ports 41 and 42 for introducing the indoor air, the outside air introduction ports 43 and 44 for introducing the outdoor air, the inside air introduction port 41 and the outside air. A first inside / outside air switching door 45 that switches between opening and closing the introduction port 43 and a second inside / outside air switching door 46 that switches between opening and closing the inside air introduction port 42 and the outside air introduction port 44 are provided.
[0031]
The inside / outside air switching unit 40 is integrated with the centrifugal blower 1 by mechanical fastening means such as bolts and screws.
[0032]
Further, on the inner diameter side of the centrifugal fan 20, the suction passage extending from the suction port 34 to the centrifugal fan 20 is divided into two, so that the passage through which the air sucked into the first fan 20a flows and the second fan 20b. A substantially cylindrical separation cylinder 47 that partitions the passage through which the air sucked into the air flows is disposed. In this embodiment, the separation cylinder 47 is integrally formed with the inside / outside air switching unit 40.
[0033]
Of the end portions in the axial direction of the separation cylinder 47, the end portion 47 a on the centrifugal fan 20 side extends in a flare shape (trumpet shape) and is positioned closer to the suction port 34 than the partition plate 33 in the axial direction. It is displaced in the axial direction with respect to the partition plate 33 and is displaced in the axial direction with respect to the first radial band 24 so as to be positioned closer to the suction port 34 than the first radial band 24 in the axial direction.
[0034]
The dashboard 50 is a partition wall that partitions the room and the outside (engine room), and a bell mouth 35 formed in a flare shape is provided on the outer edge of the suction port 34.
[0035]
Next, the function and effect of this embodiment will be described.
[0036]
As described above, the centrifugal fan 20 blows out the air sucked in from the one end side in the rotation axis direction toward the radially outward side, so that the inertia acting on itself when the flow direction changes from the axial direction to the radial direction. Due to the force, the actual turning position deviates from the position to be turned.
[0037]
On the other hand, in the present embodiment, the first radial band 24 and the centrifugal fan 20 side end 47a of the separation cylinder 47 are displaced in the axial direction with respect to the partition plate 33. By doing so, the intake flow can be turned to an appropriate position and direction.
[0038]
That is, in the present embodiment, the partition plate 33 is arranged in the substantially central portion in the axial direction so as to set the air volume ratio between the air volume blown from the first fan 20a and the air volume blown from the second fan 20b to 1: 1, The first radial band 24 and the separation cylinder 47 are shifted toward the suction port 34 with respect to the partition plate 33 in consideration of the inertial force of the air sucked into the centrifugal fan 20.
[0039]
The amount of displacement of the first radial band 24 and the end 47a of the separation cylinder 47 with respect to the partition plate 33 is appropriately determined based on the rotational speed of the centrifugal fan 20, the opening area of the suction port 34, and the like. It is.
[0040]
(Second Embodiment)
In the present embodiment, the first radial band 24 is eliminated as shown in FIG.
[0041]
In the present embodiment, the amount of displacement h of the centrifugal fan 20 side end 47a of the separation cylinder 47 with respect to the partition plate 33 is set to 20 mm based on the test result shown in FIG.
[0042]
(Third embodiment)
In the present embodiment, as shown in FIG. 5, only the first radial band 24 is shifted with respect to the partition plate 33, and the centrifugal fan 20 side end portion 47 a of the separation cylinder 47 is made to coincide with the partition plate 33.
[0043]
(Other embodiments)
In the above-described embodiment, the first radial band 24 is located on the inner side of the outer edge of the centrifugal fan 20 and divides the gap between the blades 21 into two to blow the air blown out from the centrifugal fan 20 to the flow on one end side in the axial direction. However, the present invention is not limited to this, and the flow may be provided so as to protrude outward from the outer edge of the centrifugal fan 20.
[0044]
In the above-described embodiment, the motor 10 is arranged outside the centrifugal fan 20. However, the present invention is not limited to this, and the motor 10 may be arranged inside the centrifugal fan 20.
[0045]
In the above-described embodiment, the inner diameter of the first fan 20a and the inner diameter of the second fan 20b are the same. However, the present invention is not limited to this, and for example, the inner diameter of the first fan 20a is the first. You may make both differ so that it may become larger than the internal diameter of 2 fan 20b.
[0046]
In the above-described embodiment, the air volume ratio between the air volume blown from the first fan 20a and the air volume blown from the second fan 20b is set to 1: 1, but the present invention is not limited to this. Therefore, depending on the set air volume ratio, the centrifugal fan 20 side end 47a of the first radial band 24 and the separation cylinder 47 may be shifted to the motor 10 side with respect to the partition plate 33.
[0047]
Further, in the above-described embodiment, the width dimension of the first radial band 24 is smaller than the width dimension of the blade 21, but this is a manufacturing use, and ideally, the width dimension of the first radial band 24. And the width dimension of the raid 21 are desirably the same.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a centrifugal blower for an air-conditioner for an inside / outside air two-layer flow type vehicle according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A in FIG.
FIG. 3 is a schematic view of a centrifugal blower for an air-conditioner for an inside / outside air two-layer flow type vehicle according to a second embodiment of the present invention.
FIG. 4 is a graph showing an air volume ratio.
FIG. 5 is a schematic view of a centrifugal blower for an air-conditioner for an inside / outside air two-layer flow type vehicle according to a third embodiment of the present invention.
FIG. 6 is a schematic view of a centrifugal blower for an air-conditioner for an inside / outside air two-layer flow type vehicle according to a conventional technique.
[Explanation of symbols]
20 ... centrifugal fan, 21 ... blade, 22 ... hub,
24 ... 1st radial band, 25 ... 2nd radial band,
30 ... Scroll casing, 33 ... Partition plate, 47 ... Separation cylinder.

Claims

A centrifugal blower applied to a vehicle air conditioner of a two-layer flow type of inside and outside air that can separate and simultaneously suck the cabin air and the cabin outside air,
A centrifugal fan (20) having a plurality of blades (21) arranged around the rotation axis (CL) and blowing out the air sucked from one axial end side toward the radially outer side;
A scroll casing that has a suction port (34) on one end side in the axial direction and houses the centrifugal fan (20) and that forms a spiral air passage for collecting air blown from the centrifugal fan (20). 30),
A partition plate (33) provided in the scroll casing (30) and partitioning the inside of the air passage into a first air passage (31) on one axial end side and a second air passage (32) on the other end side;
A substantially cylindrical separation tube (47) provided on the inner diameter side of the centrifugal fan (20) and dividing the suction passage from the suction port (34) to the centrifugal fan (20) into two;
Of the axial end portions of the separation cylinder (47), the end portion (47a) on the centrifugal fan (20) side is displaced in the axial direction from the partition plate (33) to the suction port (34) side. Centrifugal blower characterized by.

A centrifugal blower applied to a vehicle air conditioner of a two-layer flow type of inside and outside air that can separate and simultaneously suck the cabin air and the cabin outside air,
A centrifugal fan (20) having a plurality of blades (21) arranged around the rotation axis (CL) and blowing out the air sucked from one axial end side toward the radially outer side;
A scroll casing that has a suction port (34) on one end side in the axial direction and houses the centrifugal fan (20), and forms a spiral air passage for collecting air blown from the centrifugal fan (20). 30),
A partition plate (33) provided in the scroll casing (30) and partitioning the inside of the air passage into a first air passage (31) on one axial end side and a second air passage (32) on the other end side;
A substantially cylindrical separation tube (47) provided on the inner diameter side of the centrifugal fan (20) and dividing the suction passage from the suction port (34) to the centrifugal fan (20) into two ;
A separation plate (24) for partitioning the air blown from the centrifugal fan (20) into a flow on one end side in the axial direction and a flow on the other end side;
Of the end portions in the axial direction of the separation cylinder (47), the end portion (47a) on the centrifugal fan (20) side and the partition plate (33) are offset from each other in the axial direction, and the separation plate (24 ) Is deviated from the partition plate (33) toward the suction port (34) in the axial direction .

A centrifugal blower applied to a vehicle air conditioner of a two-layer flow type of inside and outside air that can separate and simultaneously suck the cabin air and the cabin outside air,
A centrifugal fan (20) having a plurality of blades (21) arranged around the rotation axis (CL) and blowing out the air sucked from one axial end side toward the radially outer side;
A scroll casing that has a suction port (34) on one end side in the axial direction and houses the centrifugal fan (20), and forms a spiral air passage for collecting air blown from the centrifugal fan (20). 30),
A partition plate (33) provided in the scroll casing (30) and partitioning the inside of the air passage into a first air passage (31) on one axial end side and a second air passage (32) on the other end side;
A substantially cylindrical separation tube (47) provided on the inner diameter side of the centrifugal fan (20) and dividing the suction passage from the suction port (34) to the centrifugal fan (20) into two ;
A separation plate (24) for partitioning the air blown from the centrifugal fan (20) into a flow on one end side in the axial direction and a flow on the other end side;
Of the axial ends of the separation cylinder (47), the end (47a) on the centrifugal fan (20) side is axially displaced from both the partition plate (33) and the separation plate (24). And the separation plate (24) and the partition plate (33) are offset from each other in the axial direction .

A centrifugal blower applied to a vehicle air conditioner of a two-layer flow type of inside and outside air that can separate and simultaneously suck the cabin air and the cabin outside air,
A centrifugal fan (20) having a plurality of blades (21) arranged around the rotation axis (CL) and blowing out the air sucked from one axial end side toward the radially outer side;
A scroll casing that has a suction port (34) on one end side in the axial direction and houses the centrifugal fan (20), and forms a spiral air passage for collecting air blown from the centrifugal fan (20). 30),
A partition plate (33) provided in the scroll casing (30) and partitioning the inside of the air passage into a first air passage (31) on one axial end side and a second air passage (32) on the other end side;
A substantially cylindrical separation tube (47) provided on the inner diameter side of the centrifugal fan (20) and dividing the suction passage from the suction port (34) to the centrifugal fan (20) into two ;
A separation plate (24) for partitioning the air blown from the centrifugal fan (20) into a flow on one end side in the axial direction and a flow on the other end side;
Among the axial ends of the separation cylinder (47), the end (47a) on the centrifugal fan (20) side and the partition plate (33) are offset from each other in the axial direction .
The separation plate (24) and the partition plate (33) are offset from each other in the axial direction.
Further, the end (47a) on the centrifugal fan (20) side of the axial end of the separation cylinder (47) is shifted in the axial direction from the separation plate (24) toward the suction port (34). centrifugal blower, characterized in that there.

Of the axial end portions of the separation cylinder (47), the end portion (47a) on the centrifugal fan (20) side is displaced in the axial direction from the partition plate (33) to the suction port (34) side. The centrifugal blower according to any one of claims 2 to 4, wherein

The centrifugal blower according to claim 3 or 4 , wherein the separation plate (24) is displaced in the axial direction from the partition plate (33) toward the suction port (34).