JP4606005B2

JP4606005B2 - Electric blower

Info

Publication number: JP4606005B2
Application number: JP2003309661A
Authority: JP
Inventors: 雅規笹尾; 利夫大谷; 隆夫樽谷; 規明木村
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 2003-09-02
Filing date: 2003-09-02
Publication date: 2011-01-05
Anticipated expiration: 2023-09-02
Also published as: JP2005076573A

Description

本発明は、電動送風機に関するものであり、さらに詳しくは、例えば電気掃除機の掃除機本体内で集塵室の後方（下流側）などに配されて、所定方向への空気の流れを生じさせるディフューザを有する電動送風機に関するものである。 The present invention relates to an electric blower. More specifically, the present invention is arranged, for example, behind a dust collection chamber (downstream side) in a vacuum cleaner main body of an electric vacuum cleaner to generate an air flow in a predetermined direction. The present invention relates to an electric blower having a diffuser.

この種の電動送風機におけるディフューザには、複数の渦巻き型の静翼が形成されている。そして、夫々の静翼の空気流入側の端部は、ディフューザに流入する空気の衝突による損失を低減させるため薄肉に形成されていた。（例えば、特許文献１参照）
特開２０００−１７０６９３号公報（図２） In the diffuser in this type of electric blower, a plurality of spiral stationary vanes are formed. And the edge part by the side of the air inflow of each stationary blade was formed thinly in order to reduce the loss by the collision of the air which flows in into a diffuser. (For example, see Patent Document 1)
Japanese Patent Laid-Open No. 2000-170693 (FIG. 2)

しかしながら、静翼の空気流入側の端部においては、薄肉部により流入する空気の衝突による損失を低減させて送風効率の低下を防止することはできるが、静翼の、空気流入側の端部から、内周側に隣接する静翼の空気流入側の端部とディフューザの中心とを結ぶ仮想線に交差する点までの間においては、静翼に沿って流れる空気流に乱れが生じて渦流が発生し送風効率が低下する欠点があった。 However, at the end of the stationary blade on the air inflow side, it is possible to reduce the loss due to the collision of the air flowing in by the thin wall portion to prevent the reduction of the blowing efficiency. Until the point intersecting the imaginary line connecting the air inflow end of the stationary blade adjacent to the inner peripheral side and the center of the diffuser, the air flow along the stationary blade is turbulent and vortex Occurs and the air blowing efficiency is reduced.

本発明は、このような課題を解決するためになされたものであり、簡単な構成により送風効率を向上させることができる電動送風機を提供することを課題とする。 This invention is made | formed in order to solve such a subject, and makes it a subject to provide the electric blower which can improve ventilation efficiency by simple structure.

上記課題を解決するための第１の手段は、羽根車と、羽根車の吐出側に配設された複数の渦巻き型の静翼を有するディフューザと、羽根車を駆動するモータとを備え、前記静翼の渦巻きの内周側表面部において、静翼の空気流入側の端部近傍から、渦巻きの内周側に隣接する静翼の空気流入側の端部とディフューザの中心とを結ぶ仮想線に交差する点近傍までの部分に連続して、ディフューザの中心側に突出する突出部を、滑らかな曲線で形成したことを特徴とする。
A first means for solving the above-described problem includes an impeller, a diffuser having a plurality of spiral stationary vanes disposed on the discharge side of the impeller, and a motor that drives the impeller, An imaginary line connecting the air inflow side end of the stationary blade adjacent to the inner peripheral side of the spiral and the center of the diffuser from the vicinity of the air inflow side end of the stationary blade on the inner peripheral surface portion of the stationary blade spiral A protruding portion that protrudes toward the center side of the diffuser is formed with a smooth curve continuously to a portion up to the vicinity of the point that intersects with.

また、前記静翼の突出部の最大肉厚は、１．１ｍｍ以上１．４ｍｍ以下に形成されていることが好ましい。 Moreover, it is preferable that the maximum thickness of the protrusion part of the said stationary blade is 1.1 mm or more and 1.4 mm or less.

さらに、前記ディフューザの静翼間に形成される空気流路は、空気の流れ方向に向かって静翼間の寸法は略一定で、且つ、静翼高さ寸法が大きくなるように形成されていることが好ましい。 Further, the air flow path formed between the stationary blades of the diffuser is formed so that the dimension between the stationary blades is substantially constant and the height of the stationary blade is increased in the air flow direction. It is preferable.

本発明の請求項１の構成によれば、送風の乱れを防止することができ、簡単な構成により、電動送風機の送風効率を向上させることができる等の効果を奏する。 According to the configuration of the first aspect of the present invention, it is possible to prevent the turbulence from being blown, and with the simple configuration , it is possible to improve the blowing efficiency of the electric blower.

本発明の請求項２の構成によれば、簡単な構成により、電動送風機の送風効率を著しく向上させることができる等の効果を奏する。 According to the structure of Claim 2 of this invention, there exists an effect of being able to remarkably improve the ventilation efficiency of an electric blower by simple structure.

本発明の請求項３の構成によれば、静翼間に形成される空気流路を高さ方向で増大させることにより、電動送風機を極力大型化させることなく、電動送風機の送風効率を向上させることができる等の効果を奏する。
According to the configuration of claim 3 of the present invention, by increasing the air flow path formed between the stationary blades in the height direction, the blowing efficiency of the electric blower is improved without increasing the size of the electric blower as much as possible. It is possible to achieve such an effect.

（第１実施形態）
本発明に係る電動送風機の第１実施形態を図１乃至図４に基づいて説明する。 (First embodiment)
A first embodiment of an electric blower according to the present invention will be described with reference to FIGS.

本発明の電動送風機１は、外部から空気を吸引する羽根車２と、羽根車２を覆うと共に、上方に空気流入口３を有するファンケーシング４と、羽根車２の下流側に設けられ、羽根車２を駆動するモータ５と、モータ５を支持すると共に、モータ５を覆うモータケース６と、羽根車２とモータ５との間に設けられ、羽根車２によりモータケース６内へ送風される空気を整流するディフューザ７とを備えている。 The electric blower 1 of the present invention is provided on the downstream side of the impeller 2, the impeller 2 that sucks air from the outside, the fan casing 4 that covers the impeller 2 and has the air inlet 3 on the upper side, and the impeller 2 A motor 5 that drives the vehicle 2, a motor case 6 that supports the motor 5 and covers the motor 5, and is provided between the impeller 2 and the motor 5, and is blown into the motor case 6 by the impeller 2. And a diffuser 7 that rectifies air.

羽根車２を駆動するモータ５は、ファンケーシング４内に固定されたステータ８と、ステータ８の内側に回転自在に配設されたロータ９と、ロータ９に連なってロータ９の下流側に配設された整流子１０と、整流子１０に当接するブラシ１１と、ブラシ１１を保持するブラシホルダー１２とから構成されている（図１参照）。 A motor 5 that drives the impeller 2 is arranged on the downstream side of the rotor 9, which is connected to the stator 8 fixed inside the fan casing 4, the rotor 9 that is rotatably arranged inside the stator 8, and the rotor 9. A commutator 10 is provided, a brush 11 that contacts the commutator 10, and a brush holder 12 that holds the brush 11 (see FIG. 1).

ディフューザ７は、上流側に向けて渦巻状に突出形成された静翼１３により構成される複数の空気流路１４を有する円筒状に形成されており、螺子１５によりモータケース６に固定されることによって、モータケース６の上方開放を閉塞するようになっている（図１、図２参照）。 The diffuser 7 is formed in a cylindrical shape having a plurality of air flow paths 14 constituted by stationary blades 13 projecting in a spiral shape toward the upstream side, and is fixed to the motor case 6 by screws 15. Thus, the upper opening of the motor case 6 is closed (see FIGS. 1 and 2).

ディフューザ７の静翼１３が重なり合う領域Ｘの空気流路１４は、空気の流れを減速し動圧を静圧に回復させるために、図２に示すように正面から見て下流側に向かって略扇状に広がっている。また、静翼１３が重なり合っていない領域Ｙの空気流路１４、即ち、静翼１３の、静翼１３の空気流入側の端部Ａから、渦巻きの内周側に隣接する静翼１３の空気流入側の端部Ａとディフューザ７の中心とを結ぶ仮想線に交差する点Ｂまでの部分には、ディフューザ７の中心側に突出する突出部１６が形成されている。突出部１６は滑らかな曲線で形成されている。静翼１３の空気流入側の端部Ａは、背景技術と同様に流入する空気の衝突による損失を低減させるために薄肉に形成されている（図３参照）。 The air flow path 14 in the region X where the stationary blades 13 of the diffuser 7 are overlapped is substantially directed toward the downstream as viewed from the front as shown in FIG. 2 in order to reduce the air flow and restore the dynamic pressure to the static pressure. It spreads like a fan. Further, the air flow path 14 in the region Y where the stationary blades 13 do not overlap, that is, the air of the stationary blade 13 adjacent to the inner peripheral side of the spiral from the air inflow side end A of the stationary blade 13. A protrusion 16 that protrudes toward the center of the diffuser 7 is formed at a portion up to a point B that intersects an imaginary line connecting the end A on the inflow side and the center of the diffuser 7. The protrusion 16 is formed with a smooth curve. The end A on the air inflow side of the stationary blade 13 is formed thin in order to reduce the loss due to the collision of the inflowing air as in the background art (see FIG. 3).

この電動送風機１にあっては、電動送風機１外の空気は、羽根車２の駆動によりファンケーシング４の空気流入口３から電動送風機１内に流入し、ディフューザ７を介してモータケース６内に送風される。 In the electric blower 1, the air outside the electric blower 1 flows into the electric blower 1 from the air inlet 3 of the fan casing 4 by driving the impeller 2, and enters the motor case 6 through the diffuser 7. Be blown.

ディフューザ７の静翼１３の空気流入側の端部Ａを薄肉に形成しているため、流入する空気の衝突による損失を低減させて送風効率の低下を防止することができる。また、静翼１３の、静翼１３の空気流入側の端部Ａと、渦巻きの内周側に隣接する静翼１３の空気流入側の端部Ａとディフューザ７の中心とを結ぶ仮想線に交差する点Ｂとの間に、ディフューザ７の中心側に突出する突出部１６が形成されている。この結果、静翼１３の空気流入側の端部Ａと交差する点Ｂとの間を静翼１３に沿って流れる空気流は、突出部１６により極力減速を少なくして効率よく渦流の発生を防止できる速度まで減速させることができるため、空気流に乱れが生じることがなく送風効率が向上する。また、静翼１３の突出部１６は、滑らかな曲線により形成されているため、空気流の乱れをさらに防止することができる。 Since the end A on the air inflow side of the stationary blade 13 of the diffuser 7 is formed to be thin, loss due to collision of inflowing air can be reduced to prevent a reduction in blowing efficiency. In addition, an imaginary line connecting the end A of the stationary blade 13 on the air inflow side of the stationary blade 13 and the end A of the stationary blade 13 adjacent to the inner peripheral side of the spiral and the center of the diffuser 7. A projecting portion 16 projecting toward the center of the diffuser 7 is formed between the intersecting points B. As a result, the air flow flowing along the stationary blade 13 between the end A on the air inflow side of the stationary blade 13 and the point B intersecting with the stationary blade 13 reduces the deceleration as much as possible by the protrusion 16 and efficiently generates the vortex. Since the speed can be reduced to a speed that can be prevented, the air flow is not disturbed and the blowing efficiency is improved. Moreover, since the protrusion 16 of the stationary blade 13 is formed by a smooth curve, it is possible to further prevent the air flow from being disturbed.

静翼１３の突出部１６の最大肉厚は、実験に基づいて設定している（図４参照）。本実験において、静翼１３が重なり合う領域Ｘの肉厚は１．０ｍｍである。そして、突出部１６の最大肉厚を種々変化させた時の、電動送風機１の仕事率を測定してグラフ化している。図４において、横軸は突出部１６の最大肉厚（ｍｍ）を示し、縦軸は電動送風機１の仕事率（ｗ）を示している。また、電動送風機１の仕事率が高い程、静翼１３に沿って流れる空気流の乱れが少なく、送風効率が向上していることを示している。そして、図４から、静翼１３の突出部１６の最大肉厚が１．1ｍｍ以上１．４ｍｍ以下の時、電動送風機１の送風効率が著しく向上することが分かる。即ち、電動送風機１の静翼１３が重なり合う領域Ｘの肉厚は一般的に略１．０ｍｍになっており、電動送風機１の送風効率が著しく向上させるためには、突出部１６の最大肉厚を１．1ｍｍ以上１．４ｍｍ以下にすればよい。 The maximum thickness of the protrusion 16 of the stationary blade 13 is set based on experiments (see FIG. 4). In this experiment, the thickness of the region X where the stationary blades 13 overlap is 1.0 mm. Then, the power of the electric blower 1 is measured and graphed when the maximum thickness of the protrusion 16 is variously changed. In FIG. 4, the horizontal axis indicates the maximum thickness (mm) of the protrusion 16, and the vertical axis indicates the power (w) of the electric blower 1. Moreover, it is shown that the higher the power of the electric blower 1, the less the disturbance of the air flow flowing along the stationary blade 13, and the better the blowing efficiency. 4 that the blowing efficiency of the electric blower 1 is remarkably improved when the maximum thickness of the protrusion 16 of the stationary blade 13 is 1.1 mm or more and 1.4 mm or less. That is, the thickness of the region X where the stationary blades 13 of the electric blower 1 overlap is generally about 1.0 mm. In order to significantly improve the blowing efficiency of the electric blower 1, the maximum thickness of the protrusion 16 is increased. Is 1.1 mm or more and 1.4 mm or less.

（第２実施形態）
図５乃至図７は第２実施形態を示している。第１実施形態では、ディフューザ７の静翼１３が重なり合う領域Ｘの空気流路１４を図２に示すように正面から見て下流側に向かって略扇状に広げた。これに対して、第２実施形態では、ディフューザ７ａの静翼１３ａが重なり合う領域Ｘ´の空気流路１４ａは、図５に示すように正面から見て略一定幅に形成すると共に、図７に示すように静翼１３ａの高さを空気の流れ方向に向かって高くしている。 (Second Embodiment)
5 to 7 show a second embodiment. In the first embodiment, the air flow path 14 in the region X where the stationary blades 13 of the diffuser 7 overlap is expanded in a substantially fan shape toward the downstream side as seen from the front as shown in FIG. On the other hand, in the second embodiment, the air flow path 14a in the region X ′ where the stationary blades 13a of the diffuser 7a overlap is formed with a substantially constant width when viewed from the front as shown in FIG. As shown, the height of the stationary blade 13a is increased toward the air flow direction.

空気の流れを減速し動圧を静圧に回復させるために形成されたディフューザ７ａの静翼１３ａが重なり合う領域Ｘ´の空気流路１４ａは、できる限り長く形成した方が電動送風機１の送風効率が向上する。しかしながら、第１実施形態のように、静翼１３が重なり合う領域Ｘの空気流路１４を正面から見て下流側に向かって略扇状に広げた構成（図２参照）の場合、電動送風機１の送風効率を向上させるために、静翼１３が重なり合う領域Ｘの空気流路１４を長く形成すると、空気流路１４を長く形成した分だけディフューザ７の外径が大きくなってしまう。この結果、電動送風機１が大型化してしまう。 The air flow efficiency of the electric blower 1 is such that the air flow path 14a in the region X ′ where the stationary blades 13a of the diffuser 7a overlap to reduce the air flow and restore the dynamic pressure to static pressure is formed as long as possible. Will improve. However, in the case of the configuration in which the air flow path 14 in the region X where the stationary blades 13 overlap is expanded in a substantially fan shape toward the downstream side when viewed from the front as in the first embodiment (see FIG. 2), the electric blower 1 If the air flow path 14 in the region X where the stationary blades 13 overlap is formed to be longer in order to improve the blowing efficiency, the outer diameter of the diffuser 7 is increased by the length that the air flow path 14 is formed longer. As a result, the electric blower 1 becomes large.

これに対して、第２実施形態では、図５に示すようにディフューザ７ａの静翼１３ａが重なり合う領域Ｘ‘の空気流路１４ａの幅を略一定にして空気流路１４ａを長く形成することにより、ディフューザ７ａの外径を大きくすることなく、空気流路１４ａを長くすることができる。また、静翼１３ａの高さ寸法を図７に示すように空気の流れ方向に向かって高くすることにより、静翼１３ａの高さを最低限高くするだけで、空気の流れを減速し動圧を静圧に回復させることができる。従って、第２実施形態の構成とすることにより、電動送風機１の大型化を極力防止することができると共に、空気の流れを減速し動圧を静圧に十分回復させることができ、電動送風機１の送風効率を向上させることができる。 On the other hand, in the second embodiment, as shown in FIG. 5, the width of the air flow path 14a in the region X ′ where the stationary vanes 13a of the diffuser 7a overlap is made substantially constant to make the air flow path 14a longer. The air flow path 14a can be lengthened without increasing the outer diameter of the diffuser 7a. Further, by increasing the height dimension of the stationary blade 13a in the air flow direction as shown in FIG. 7, the air flow is reduced and the dynamic pressure is reduced only by increasing the height of the stationary blade 13a to the minimum. Can be restored to static pressure. Therefore, by adopting the configuration of the second embodiment, it is possible to prevent the electric blower 1 from being enlarged as much as possible, reduce the air flow, and sufficiently restore the dynamic pressure to the static pressure. The air blowing efficiency can be improved.

尚、第１実施形態及び第２実施形態の構成を別々に説明したが、第１実施形態及び第２実施形態を組み合わせた構成にしてもよい。この結果、電動送風機１の送風効率をより以上向上させることができる。 In addition, although the structure of 1st Embodiment and 2nd Embodiment was demonstrated separately, you may make it the structure which combined 1st Embodiment and 2nd Embodiment. As a result, the blowing efficiency of the electric blower 1 can be further improved.

本発明を実施するための最良の第１実施形態を示す電動送風機を側方から見た半断面図である。It is the half sectional view which looked at the electric blower which shows the best 1st embodiment for carrying out the present invention from the side. 同電動送風機のディフューザを正面から見た図である。It is the figure which looked at the diffuser of the electric blower from the front. 同電動送風機のディフューザを正面から見た図で、図２のα部を拡大した状態を示す。It is the figure which looked at the diffuser of the same electric blower from the front, and shows the state where α part of Drawing 2 was expanded. 静翼の突出部の最大肉厚と電動送風機の仕事率との関係を示す実験データである。It is an experimental data which shows the relationship between the maximum thickness of the protrusion part of a stationary blade, and the work rate of an electric blower. 本発明を実施するための最良の第２実施形態を示す電動送風機のディフューザを正面から見た図である。It is the figure which looked at the diffuser of the electric blower which shows the best 2nd Embodiment for implementing this invention from the front. 同電動送風機のディフューザを正面から見た図で、拡大した静翼を示す。The figure which looked at the diffuser of the electric blower from the front shows an enlarged stationary blade. 図５及び図６のＣ―Ｃ断面図で、静翼の高さ関係を示す。FIG. 5 is a cross-sectional view taken along the line CC of FIG.

Explanation of symbols

１電動送風機
２羽根車
４ファンケーシング
５モータ
６モータケース
７ディフューザ
１３静翼
１６突出部
Ａ端部
Ｂ交差する点 DESCRIPTION OF SYMBOLS 1 Electric blower 2 Impeller 4 Fan casing 5 Motor 6 Motor case 7 Diffuser 13 Stator blade 16 Projection part A End part B Intersection point

Claims

An impeller, a diffuser having a plurality of spiral stationary vanes disposed on the discharge side of the impeller, and a motor for driving the impeller, from the vicinity of the end portion of the air inflow side of the blade, consecutively to a portion of up to near the point of intersection to the imaginary line connecting the center of the end portion and the diffuser of the air inlet side of the vane adjacent to the inner periphery of the spiral, An electric blower characterized in that a protruding portion protruding toward the center side of the diffuser is formed with a smooth curve.

The electric blower according to claim 1, wherein the maximum thickness of the protruding portion of the stationary blade is 1.1 mm or more and 1.4 mm or less.

The air flow path formed between the stationary blades of the diffuser is formed so that the dimension between the stationary blades is substantially constant and the height of the stationary blade is increased in the air flow direction. The electric blower according to claim 1 or 2, wherein the electric blower is characterized.