JP2021120572A - Electric blower and vacuum cleaner using the same - Google Patents

Electric blower and vacuum cleaner using the same Download PDF

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JP2021120572A
JP2021120572A JP2021074593A JP2021074593A JP2021120572A JP 2021120572 A JP2021120572 A JP 2021120572A JP 2021074593 A JP2021074593 A JP 2021074593A JP 2021074593 A JP2021074593 A JP 2021074593A JP 2021120572 A JP2021120572 A JP 2021120572A
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Prior art keywords
electric blower
bearing
axial direction
coil
bridge
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Inventor
正禎 尾島
Masasada Ojima
正禎 尾島
則和 伊藤
Norikazu Ito
則和 伊藤
武史 本多
Takeshi Honda
武史 本多
賢宏 伊藤
Masahiro Ito
賢宏 伊藤
靖 金賀
Yasushi Kanega
靖 金賀
真一 湧井
Shinichi Wakui
真一 湧井
繁則 佐藤
Shigenori Sato
繁則 佐藤
誠二 坂上
Seiji Sakagami
誠二 坂上
春雄 小原木
Haruo Koharagi
春雄 小原木
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Hitachi Global Life Solutions Inc
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Hitachi Global Life Solutions Inc
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Priority to JP2021074593A priority Critical patent/JP2021120572A/en
Publication of JP2021120572A publication Critical patent/JP2021120572A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Electric Suction Cleaners (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

To solve the problems that: when a cooling structure is employed which has a vent hole bored in a motor housing side face, cooling air into a motor machine is not enough in capacity and bearing temperature may rise; even when an end bracket is provided with an opening part which is inclined in an axial direction, cooling air is blown to a coil with the opening part and coil arranged at substantially the same positions when viewed from a radial direction, to cause large ventilation loss; and further, sufficient air does not reach a bearing on one side in which the end bracket is provided with an opening part and which is not inclined to the axial direction, to cause temperature rise of the bearing on the one side.SOLUTION: An electric blower has a shaft, a rotor, a stator having a core and a coil, a bracket retaining a bearing enabling the shaft to rotate, and bridges, wherein bridges have an opening part formed, and a gap is formed at the opening part formed between the bridges.SELECTED DRAWING: Figure 1

Description

本発明は、電動送風機に関するものである。 The present invention relates to an electric blower.

近年需要が急速に高まっているコードレス掃除機においては、低電圧のバッテリー駆動においても十分な出力を得るためにブラシレスモータを用いた電動送風機が搭載されている。こうしたブラシレスモータにおいては、小型化のために高速化が検討されている。 Cordless vacuum cleaners, whose demand is rapidly increasing in recent years, are equipped with an electric blower using a brushless motor in order to obtain sufficient output even when driven by a low-voltage battery. In such brushless motors, high speed is being studied for miniaturization.

特開2013−24134号公報Japanese Unexamined Patent Publication No. 2013-24134 特開平5−231390号公報Japanese Unexamined Patent Publication No. 5-231390

こうした小型の高速ブラシレスモータにおいては、損失の大部分が軸受けの機械損になる。そのため、モータ機内の内側にまで冷却風を導く必要がある一方で、従来冷却が必要であったコイルなどの冷却の必要性は低下する。 In such a small high-speed brushless motor, most of the loss is the mechanical loss of the bearing. Therefore, while it is necessary to guide the cooling air to the inside of the motor machine, the need for cooling the coil or the like, which conventionally required cooling, is reduced.

こうしたモータに上記特許文献1のようなモータハウジング側面に通風口を開ける冷却構造を採用した場合、モータ機内への冷却風量が不足し、軸受けの温度上昇を招く。また、上記特許文献2のように、エンドブラケットに設けた軸方向に傾斜した開口部を設けた場合でも、開口部とコイルが径方向から見てほぼ同一の位置に配置されると、コイルに冷却風があたることで大きな通風損失を招く。また、エンドブラケットに軸方向に傾斜しない開口部を設けた側の軸受けには冷却風が十分に当たらないため、片側の軸受けの温度上昇を招く。 When a cooling structure that opens a ventilation port on the side surface of the motor housing as in Patent Document 1 is adopted for such a motor, the amount of cooling air into the motor machine is insufficient, which causes the temperature of the bearing to rise. Further, even when an opening inclined in the axial direction provided in the end bracket is provided as in Patent Document 2, if the opening and the coil are arranged at substantially the same position when viewed from the radial direction, the coil The cooling air causes a large ventilation loss. Further, since the cooling air does not sufficiently hit the bearing on the side where the end bracket is provided with the opening that does not incline in the axial direction, the temperature of the bearing on one side rises.

本発明は、上記問題点を解決するためになされたものであって、その目的は冷却風の通風損失を下げ、軸受けへ冷却風を十分かつバランスよくあてることで、軸受けの温度上昇を抑制した電動送風機および該モータを用いた電気掃除機を提供する事にある。 The present invention has been made to solve the above problems, and an object of the present invention is to reduce the ventilation loss of the cooling air and to apply the cooling air to the bearing in a sufficient and well-balanced manner to suppress the temperature rise of the bearing. It is an object of the present invention to provide an electric blower and an electric vacuum cleaner using the motor.

上記の問題を解決するために、本発明では、シャフトと、ロータと、コアとコイルを有したステータと、シャフトを回転可能にする軸受けを保持するブラケットと、ブリッジと、を有したモータを有した電動送風機であって、ブリッジに開口部が形成され、前記ブリッジの間に形成される開口部には空隙が形成されていることを特徴とする電動送風機。 In order to solve the above problems, the present invention includes a motor having a shaft, a rotor, a stator having a core and a coil, a bracket for holding a bearing that makes the shaft rotatable, and a bridge. An electric blower characterized in that an opening is formed in a bridge and a gap is formed in the opening formed between the bridges.

本発明によれば、通風損失を下げ、軸受けを十分に冷却することで高効率かつ高寿命な電動送風機および該モータを用いた電気掃除機を得ることが出来る。 According to the present invention, it is possible to obtain a highly efficient and long-life electric blower and a vacuum cleaner using the motor by reducing the ventilation loss and sufficiently cooling the bearing.

本発明の一実施例に係る電動送風機の断面図である。It is sectional drawing of the electric blower which concerns on one Example of this invention. （ａ）本発明の一実施例に係る電動機部分のみの斜視図である。（ｂ）本発明の一実施例に係る電動機部分のみの俯瞰図である。(A) It is a perspective view of only the electric motor part which concerns on one Example of this invention. (B) It is a bird's-eye view of only the electric motor part which concerns on one Example of this invention. 回転数の違いによる機械損と銅損の差を示す図である。It is a figure which shows the difference between the mechanical loss and the copper loss due to the difference in the rotation speed. 本発明の一実施例に係る電動送風機と基板とを示す外観図である。It is an external view which shows the electric blower and the substrate which concerns on one Example of this invention. 本発明の別実施例に係る電動送風機の断面図である。It is sectional drawing of the electric blower which concerns on another Example of this invention.

以下に、本発明の実施の形態を示す。 Hereinafter, embodiments of the present invention will be shown.

図1に、本実施形態の電動送風機1の断面図を示す。電動送風機1はコア2とコイル3を有したステータ4と、シャフト5を有するロータ6と、シャフト5を回転可能にする軸受け7を保持するエンドブラケット8を有している。シャフト5にはインペラ9が取り付けられており、エンドブラケット8の一つにはディフューザ10が取り付けられており、ディフューザ10のエンドブラケット8側にはリターン11が設けられており、インペラとディフューザを覆うようにファンケーシング12が配置されている。また、この電動送風機1の最大回転数は7万回転以上である。 FIG. 1 shows a cross-sectional view of the electric blower 1 of the present embodiment. The electric blower 1 has a stator 4 having a core 2 and a coil 3, a rotor 6 having a shaft 5, and an end bracket 8 holding a bearing 7 that makes the shaft 5 rotatable. An impeller 9 is attached to the shaft 5, a diffuser 10 is attached to one of the end brackets 8, and a return 11 is provided on the end bracket 8 side of the diffuser 10 to cover the impeller and the diffuser. The fan casing 12 is arranged so as to. The maximum rotation speed of this electric blower 1 is 70,000 or more.

このような電動送風機1のうち、ファンケーシング12やインペラ9、ディフューザ10などを除いた電動機部分のみの斜視図および俯瞰図を図2に示す。ブラケット8は、軸受けを固定する軸受けハウジング13と、その軸受けハウジング13から外周側に伸びたブリッジ14により構成されており、このブリッジ14とコイル3がシャフト5の径方向から見てほぼ同一の方向に配置されている。 FIG. 2 shows a perspective view and a bird's-eye view of only the electric motor portion of such an electric blower 1 excluding the fan casing 12, the impeller 9, the diffuser 10, and the like. The bracket 8 is composed of a bearing housing 13 for fixing the bearing and a bridge 14 extending from the bearing housing 13 to the outer peripheral side, and the bridge 14 and the coil 3 are in substantially the same direction when viewed from the radial direction of the shaft 5. Is located in.

図3に、特許文献2に記載されている従来の電動送風機の断面図を示す。このような従来の電動送風機の回転数は5万回転以下であるため、図4に示すように、コイルで発生する銅損と軸受けで発生する機械損の割合はほぼ1対1程度であった。そのため、コイルの絶縁被覆を保護するためにコイルの冷却を十分にする必要があり、ブリッジ間の開口部にコイルを配置することで、コイルに冷却風をあてていた。このようなコイルとブリッジの配置においては、コイルの冷却は十分である一方で、通風損失が大きくなるという問題があった。 FIG. 3 shows a cross-sectional view of the conventional electric blower described in Patent Document 2. Since the rotation speed of such a conventional electric blower is 50,000 rotations or less, as shown in FIG. 4, the ratio of copper loss generated in the coil to mechanical loss generated in the bearing is about 1: 1. .. Therefore, it is necessary to sufficiently cool the coil in order to protect the insulating coating of the coil, and by arranging the coil in the opening between the bridges, cooling air is blown to the coil. In such an arrangement of the coil and the bridge, there is a problem that the ventilation loss becomes large while the coil is sufficiently cooled.

一方、本実施形態の電動送風機においては、回転数が7万回転以上と従来よりも高回転であるため、図4に示すように、軸受け7で発生する機械損よりもコイル3で発生する銅損の割合が小さく、コイル冷却の必要性が低下する。また、高速回転した場合にコイル3の実質抵抗が増加する場合があるが、コイル3を3本以上の多本持ちにすることで、その抵抗の増加を抑えることが出来る。このようにコイル銅損を下げる一方で、コイル3とブリッジ14の位置をシャフト5の径方向から見て同じ位置に配置することで、ブリッジ14間の開口部にはコイル3間の空隙が配置されることになるため、通風損失が低下し、電動送風機1の効率が向上する。 On the other hand, in the electric blower of the present embodiment, the rotation speed is 70,000 or more, which is higher than the conventional one. Therefore, as shown in FIG. 4, the copper generated in the coil 3 is larger than the mechanical loss generated in the bearing 7. The rate of loss is small and the need for coil cooling is reduced. Further, the actual resistance of the coil 3 may increase when rotating at high speed, but the increase in the resistance can be suppressed by having a large number of three or more coils 3. While reducing the coil copper loss in this way, by arranging the positions of the coil 3 and the bridge 14 at the same position when viewed from the radial direction of the shaft 5, a gap between the coils 3 is arranged in the opening between the bridges 14. Therefore, the ventilation loss is reduced and the efficiency of the electric blower 1 is improved.

さらに、ブリッジ14を軸方向に傾斜させ、その傾斜部の軸方向成分と径方向成分を比較した場合に軸方向成分の方が大きいような構造とすることで、ディフューザ10から電動機内に入る風の一部が軸受け7近くにまで直接流れ込むようになるため、軸受け7の冷却性能が向上し、電動送風機1の寿命が向上する。 Further, by inclining the bridge 14 in the axial direction and making the structure so that the axial component is larger when the axial component and the radial component of the inclined portion are compared, the wind entering the motor from the diffuser 10 is formed. Since a part of the bearing 7 flows directly to the vicinity of the bearing 7, the cooling performance of the bearing 7 is improved and the life of the electric blower 1 is improved.

また、ブリッジ14を軸方向に傾斜した部分とコイル3のコア2からはみ出た部分と同程度に軸方向に伸びた部分を有する構造にすることで、ブリッジ14間の開口部の面積を大きくする一方でブリッジ14の強度を保つことが出来る。この時、リターン11の高さをブリッジ14の傾斜部の高さ以下とすることで、冷却に必要のない風をエンドブラケット8の排出口15から排出することが可能となり、送風損失を下げることが出来る。 Further, the area of the opening between the bridges 14 is increased by forming the bridge 14 so as to have a portion inclined in the axial direction and a portion extending in the axial direction to the same extent as the portion protruding from the core 2 of the coil 3. On the other hand, the strength of the bridge 14 can be maintained. At this time, by setting the height of the return 11 to be equal to or less than the height of the inclined portion of the bridge 14, it is possible to exhaust the air that is not necessary for cooling from the exhaust port 15 of the end bracket 8 to reduce the air blow loss. Can be done.

ステータ4の軸方向両側に軸受け7が配置される場合、図3の従来例のように反インペラ側のエンドブラケット8のブリッジ14が軸受けハウジング13とほぼ同一平面上で構成されている場合と比較して、反インペラ側のエンドブラケット8のブリッジ14を軸方向に傾斜させることで、さらに通風損失を下げることが出来る。 When the bearings 7 are arranged on both sides in the axial direction of the stator 4, compared with the case where the bridge 14 of the end bracket 8 on the anti-impeller side is configured on substantially the same plane as the bearing housing 13 as in the conventional example of FIG. Then, by inclining the bridge 14 of the end bracket 8 on the anti-impeller side in the axial direction, the ventilation loss can be further reduced.

また、反インペラ側のエンドブラケット8のブリッジ14を軸方向に傾斜させた場合、冷却風は径方向に吐き出されるようになるため、電動送風機下流に配置する制御基板16をシャフト5と垂直な平面内に配置することで、制御基板16の冷却に伴う通風損失を下げることが出来る。 Further, when the bridge 14 of the end bracket 8 on the anti-impeller side is tilted in the axial direction, the cooling air is discharged in the radial direction. Therefore, the control board 16 arranged downstream of the electric blower is placed on a plane perpendicular to the shaft 5. By arranging it inside, it is possible to reduce the ventilation loss due to the cooling of the control board 16.

図6に、第2の本実施形態の電動送風機の断面図を示す。複数の軸受け7をステータ4のインペラ側にまとめて配置することで、エンドブラケット8が一つで済むため、低コスト化が可能となる。また、軸受けハウジング13が軸方向に長くなるため、冷却風のあたる面積が増加し、軸受けの冷却性能が向上する。 FIG. 6 shows a cross-sectional view of the electric blower of the second embodiment. By arranging the plurality of bearings 7 together on the impeller side of the stator 4, only one end bracket 8 is required, so that the cost can be reduced. Further, since the bearing housing 13 becomes longer in the axial direction, the area exposed to the cooling air increases, and the cooling performance of the bearing is improved.

本実施例の電動送風機を電気掃除機に用いることで、電気掃除機の高効率化や長寿命化を得ることが出来る。 By using the electric blower of this embodiment as an electric vacuum cleaner, it is possible to obtain high efficiency and long life of the electric vacuum cleaner.

１ 電動送風機
２ コア
３ コイル
４ ステータ
５ シャフト
６ ロータ
７ 軸受け
８ エンドブラケット
９ インペラ
１０ ディフューザ
１１ リターン
１２ ファンケーシング
１３ 軸受けハウジング
１４ ブリッジ
１５ 排出口
１６ 制御基板 1 Electric blower 2 Core 3 Coil 4 Stator 5 Shaft 6 Rotor 7 Bearing 8 End bracket 9 Impeller 10 Diffuser 11 Return 12 Fan casing 13 Bearing housing 14 Bridge 15 Outlet 16 Control board

Claims (10)

シャフトと、ロータと、コアとコイルを有したステータと、
シャフトを回転可能にする軸受けを保持するブラケットと、ブリッジと、を有したモータを有した電動送風機であって、
ブリッジに開口部が形成され、
前記ブリッジの間に形成される開口部には空隙が形成されていることを特徴とする電動送風機。 A shaft, a rotor, a stator with a core and a coil,
An electric blower having a motor with a bracket holding a bearing that makes the shaft rotatable and a bridge.
An opening is formed in the bridge,
An electric blower characterized in that a gap is formed in an opening formed between the bridges. 請求項１に記載された電動送風機であって、ブリッジが軸方向に傾斜しており、その傾斜部の軸方向成分と径方向成分を比較した場合、軸方向成分の方が大きい構造を有していること。 The electric blower according to claim 1, wherein the bridge is inclined in the axial direction, and when the axial component and the radial component of the inclined portion are compared, the axial component has a larger structure. That you are. 請求項１から請求項２に記載された電動送風機であって、ステータの軸方向両側に配置したブラケットのブリッジが、どちらも軸方向に傾斜していること。 The electric blower according to claim 1 to 2, wherein the bridges of the brackets arranged on both sides in the axial direction of the stator are both inclined in the axial direction. 請求項２から請求項３に記載された電動送風機であって、ブリッジが軸方向に傾斜した部分と軸方向にコイルエンドと同程度に伸びた部分を有する構造であること。 The electric blower according to claim 2 to 3, having a structure in which the bridge has a portion inclined in the axial direction and a portion extending in the axial direction to the same extent as the coil end. 請求項１から請求項４に記載された電動送風機であって、エンドブラケットに固定されたディフューザに設けられたリターンの高さが、ブリッジの傾斜部の高さ以下であること。 The electric blower according to any one of claims 1 to 4, wherein the height of the return provided on the diffuser fixed to the end bracket is equal to or less than the height of the inclined portion of the bridge. 請求項１から請求項５に記載された電動送風機であって、モータが7万回転以上で動作すること。 The electric blower according to any one of claims 1 to 5, wherein the motor operates at 70,000 rpm or more. 請求項６に記載された電動送風機であって、コイルが3本持ち以上であること。 The electric blower according to claim 6, which has three or more coils. 請求項１から請求項７に記載された電動送風機であって、軸受けをステータの片側に配置し、ブラケットを1つとしたもの。 The electric blower according to any one of claims 1 to 7, wherein the bearing is arranged on one side of the stator and the bracket is one. 請求項１から請求項８に記載された電動送風機であって、制御基板を軸方向とほぼ垂直な方向に配置したもの。 The electric blower according to any one of claims 1 to 8, wherein the control board is arranged in a direction substantially perpendicular to the axial direction. 請求項１から請求項９に記載された電動送風機を用いた電気掃除機。 A vacuum cleaner using the electric blower according to any one of claims 1 to 9.
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