WO2016121447A1 - Electric air blower and electric vacuum cleaner using same - Google Patents

Electric air blower and electric vacuum cleaner using same Download PDF

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Publication number
WO2016121447A1
WO2016121447A1 PCT/JP2016/050414 JP2016050414W WO2016121447A1 WO 2016121447 A1 WO2016121447 A1 WO 2016121447A1 JP 2016050414 W JP2016050414 W JP 2016050414W WO 2016121447 A1 WO2016121447 A1 WO 2016121447A1
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Prior art keywords
frame
electric blower
fixed
outer peripheral
fan casing
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PCT/JP2016/050414
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French (fr)
Japanese (ja)
Inventor
正禎 尾島
武史 本多
坂上　誠二
菊地　聡
佐藤　繁則
伊藤　則和
賢宏 伊藤
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日立アプライアンス株式会社
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Publication of WO2016121447A1 publication Critical patent/WO2016121447A1/en

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • 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
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps

Definitions

  • the present invention relates to an electric blower and a vacuum cleaner using the same.
  • cordless vacuum cleaners for which demand is rapidly increasing, are equipped with an electric blower using a brushless motor in order to obtain sufficient output even when driven by a low voltage battery.
  • miniaturization of electric blowers is also required.
  • the outer diameter of the fan can be reduced by increasing the speed of the electric blower. Therefore, there are many examples in which the number of rotations of the brushless motor is about 80,000 or more.
  • the motor of Patent Document 1 Since the motor of Patent Document 1 has an opening in the outer peripheral direction of the bearing holder, when the motor of Patent Document 1 is supported on the main body of the vacuum cleaner, it is supported by a fan casing and a motor housing. In the motor having the configuration as in Patent Document 1, since the motor cannot be supported on the main body of the vacuum cleaner on the outer periphery of the bearing holder close to the center of gravity, vibration noise may increase.
  • the fixing of the fan casing to the diffuser of Patent Document 1 is performed by passing the protrusion of the diffuser through the hole of the fan casing and fixing with an annular adhesive, and does not fix the fan casing in the axial direction.
  • the gap between the fan casing and the diffuser 26 cannot be reduced, and the motor efficiency may be reduced.
  • This invention was made in order to solve the said subject, and it is providing the electric blower which suppressed the vibration noise and improved the motor efficiency, and a vacuum cleaner using the same.
  • a stator having a core and a coil, a rotor having a shaft, an impeller fixed to the shaft, a pair of bearings disposed between the rotor and the impeller
  • the frame includes a bearing holding portion for holding the bearing; The outer peripheral portion positioned outside the bearing holding portion, and can be supported by the outer peripheral portion to other parts, and the fan casing is fixed to the outer peripheral portion in the axial direction.
  • outer peripheral portion is an annular portion.
  • a low noise and high efficiency electric blower and a vacuum cleaner using the motor can be obtained by supporting the motor at the bearing position and fixing the fan casing in the axial direction.
  • FIG. 3 is an enlarged view of FIG. 2. It is AA sectional drawing of FIG. 1 which shows the electric motor part of the electric blower of the Example in this invention.
  • the frame 21 has a double structure of a bearing holding portion 22 that holds the bearing cover 32 and an annular portion of the outer peripheral portion 23.
  • the bearing holding portion 22 of the frame 21 and the annular outer peripheral portion 23 are connected by a bridge 24.
  • the diffuser 12 is fixed with screws to the impeller 11 side (upper side) of the frame 21, and the stator 35 is fixed to the rotor 34 side (lower side) of the frame 21.
  • the fan casing 10 disposed so as to cover the impeller 11 and the diffuser 12 is fixed to the frame outer peripheral portion 23.
  • an annular frame is arranged on the outer periphery of the stator, and the stator is fixed inside the annular frame. Therefore, the electromagnetic vibration of the stator and the mechanical vibration of the rotor are transmitted to the frame, which may cause vibration noise.
  • an electric blower is hold
  • the position of the center of gravity of the electric blower is close to the position where the bearing is held.
  • the electric blower Since it is difficult to be transmitted to the outer peripheral portion, there is an effect that the sound from the housing is reduced.
  • the electric blower since the electric blower is supported on the main body of the vacuum cleaner via the inner case at the outer peripheral portion where the bearing 31 is held, the electric blower can be supported on the main body of the vacuum cleaner near the position of the center of gravity. It becomes. Therefore, it becomes easy to suppress the shaft vibration of the electric blower, and low vibration and low noise of the electric vacuum cleaner can be obtained.
  • FIG. 5 shows an enlarged view of FIG.
  • the fan casing 10 is fixed in the axial direction (vertical direction) of the shaft by a claw-like protrusion 25 provided on the outer peripheral portion 23 of the frame 21.
  • the fan casing 10 and the frame 21 are fixed by inserting a protrusion 25 protruding in the radial direction from the outer peripheral portion 23 of the frame 21 into a hole 10 a provided in the side surface portion of the fan casing 10.
  • the fan casing 10 is fixed in the axial direction by the claw-like projections 25 of the frame 21, so that the axial positioning accuracy of the fan casing 10 and the impeller 11 can be ensured even when the elastic body is sandwiched. Therefore, leakage between the fan casing 10 and the impeller 11 can be reduced, and the efficiency of the electric blower is improved.
  • fixing of the fan casing 10 in the axial direction not only the protrusion 25 is provided on the frame 21 side and the hole is provided in the fan casing 10, but the recess may be provided on the frame 21 side.
  • the thickness of the stator 35 can be reduced as compared with the conventional single-phase drive.
  • the center of gravity of the motor approaches the impeller side even between the bearings. Therefore, when the outer peripheral portion 23 of the frame has a length up to the position of the center of gravity, the axial length of the frame can be shortened. Thereby, the radiation sound from the frame outer peripheral part 23 can be made small.
  • the structure of the stator 35 and the rotor 34 is not limited to this as long as three-phase driving is possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electric Suction Cleaners (AREA)

Abstract

Provided is an electric air blower which suppresses vibration noise and has improved motor efficiency, as well as an electric vacuum cleaner using the electric air blower. The electric air blower comprises: a stator having a core and a coil; a rotor having a shaft; an impeller fixed to the shaft; a pair of bearings disposed between the rotor and the impeller; a brushless motor having a frame which retains the pair of bearings; a diffuser fixed to the frame; and a fan casing fixed to the frame. The frame is configured in a double structure consisting of a bearing retention part and an outer circumferential part, and the fan casing is fixed axially to the outer circumferential part.

Description

電動送風機およびそれを用いた電気掃除機Electric blower and electric vacuum cleaner using the same
　本発明は、電動送風機およびそれを用いた電気掃除機に関するものである。 The present invention relates to an electric blower and a vacuum cleaner using the same.
　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。 In recent years, cordless vacuum cleaners, for which demand is rapidly increasing, are equipped with an electric blower using a brushless motor in order to obtain sufficient output even when driven by a low voltage battery.
　電気掃除機の小型の需要を達成するために、電動送風機の小型化も求められている。電動送風機の小型化に関しては、電動送風機を高速化することでファンの外径を小さくすることが出来る。そのため、ブラシレスモータの回転数を約８万回転以上としている例が多い。 To reduce the demand for electric vacuum cleaners, miniaturization of electric blowers is also required. Regarding miniaturization of the electric blower, the outer diameter of the fan can be reduced by increasing the speed of the electric blower. Therefore, there are many examples in which the number of rotations of the brushless motor is about 80,000 or more.
　こうした小型高速ブラシレスモータとして、特許文献１のようなモータがあげられる。
特許文献１のモータでは、インペラと回転子コア（ロータ）の間に一対の軸受（ベアリング）を有し、インペラと固定子アセンブリの間にヒートシンクアセンブリ５（モータハウジング）が配置されている。ベアリングホルダ内で一対のベアリングを整列させることで、高速回転を可能にしている。また、ベアリングホルダに関しては、外周方向（ファンケーシングの入口開口方向）から冷却風が流れ込む構造となっている。 As such a small high-speed brushless motor, there is a motor as described in Patent Document 1.
The motor of Patent Document 1 has a pair of bearings (bearings) between an impeller and a rotor core (rotor), and a heat sink assembly 5 (motor housing) is disposed between the impeller and the stator assembly. High-speed rotation is enabled by aligning a pair of bearings in the bearing holder. Further, the bearing holder has a structure in which cooling air flows from the outer peripheral direction (in the opening direction of the inlet of the fan casing).
特開２０１４-２１９００６号公報JP 2014-219006 A
　特許文献１のモータは、ベアリングホルダの外周方向に開口を備えているため、特許文献１のモータを電気掃除機本体に支持する際には、ファンケーシングとモータハウジングで支持することになる。特許文献１のような構成のモータにおいては、重心位置に近いベアリングホルダの外周でモータを電気掃除機本体へ支持することが出来ないため、振動騒音が大きくなる恐れがある。 Since the motor of Patent Document 1 has an opening in the outer peripheral direction of the bearing holder, when the motor of Patent Document 1 is supported on the main body of the vacuum cleaner, it is supported by a fan casing and a motor housing. In the motor having the configuration as in Patent Document 1, since the motor cannot be supported on the main body of the vacuum cleaner on the outer periphery of the bearing holder close to the center of gravity, vibration noise may increase.
　また、特許文献１のモータの固定子アセンブリ６（ステータ）とモータハウジングが接する部分が大きいため、モータの振動がモータハウジングに伝わりやすく、モータハウジングの振動による音が大きくなる恐れがある。 Further, since the portion where the motor stator assembly 6 (stator) and the motor housing of Patent Document 1 are in contact with each other is large, the vibration of the motor is easily transmitted to the motor housing, and there is a possibility that the sound due to the vibration of the motor housing is increased.
　また、特許文献１のファンケーシングのディフューザへの固定は、ファンケーシングの穴にディフューザの突起を通し環状の接着剤で固定することにより行われており、ファンケーシングを軸方向に固定するものでないため、ファンケーシングとディフューザ２６の隙間を小さくできず、モータの効率が低くなる恐れがある。 In addition, the fixing of the fan casing to the diffuser of Patent Document 1 is performed by passing the protrusion of the diffuser through the hole of the fan casing and fixing with an annular adhesive, and does not fix the fan casing in the axial direction. The gap between the fan casing and the diffuser 26 cannot be reduced, and the motor efficiency may be reduced.
　本発明は、上記課題を解決するためになされたものであり、振動騒音を抑制し、モータ効率を改善した電動送風機及びそれを用いた電気掃除機を提供することにある。 This invention was made in order to solve the said subject, and it is providing the electric blower which suppressed the vibration noise and improved the motor efficiency, and a vacuum cleaner using the same.
　上記の課題を解決するために、本発明では、コアとコイルを有したステータと、シャフトを有したロータと、シャフトに固定されたインペラと、ロータとインペラ間に配置された一対の軸受けと、その一対の軸受けを保持するフレームを有したブラシレスモータと、フレームに固定されたディフューザと、フレームに固定されたファンケーシングを有した電動送風機において、前記フレームは、前記軸受けを保持する軸受け保持部と、該軸受け保持部よりも外側に位置する外周部と、の二重構造であり、前記外周部で他部品へ支持可能であり、前記外周部に前記ファンケーシングを軸方向に固定することを特徴とする。 In order to solve the above problems, in the present invention, a stator having a core and a coil, a rotor having a shaft, an impeller fixed to the shaft, a pair of bearings disposed between the rotor and the impeller, In an electric blower having a brushless motor having a frame for holding the pair of bearings, a diffuser fixed to the frame, and a fan casing fixed to the frame, the frame includes a bearing holding portion for holding the bearing; The outer peripheral portion positioned outside the bearing holding portion, and can be supported by the outer peripheral portion to other parts, and the fan casing is fixed to the outer peripheral portion in the axial direction. And
　また、外周部は、円環部分であることを特徴とする。 Further, the outer peripheral portion is an annular portion.
　本発明によれば、ベアリング位置でモータを支持し、ファンケーシングを軸方向に固定することで低騒音かつ高効率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, a low noise and high efficiency electric blower and a vacuum cleaner using the motor can be obtained by supporting the motor at the bearing position and fixing the fan casing in the axial direction.
本発明における実施例の電動送風機の外観の側面図である。It is a side view of the external appearance of the electric blower of the Example in this invention. 本発明における実施例の電動送風機の１側面断面図である。It is 1 side sectional drawing of the electric blower of the Example in this invention. 本発明における実施例のフレームの斜視図である。It is a perspective view of the flame | frame of the Example in this invention. 本発明における実施例のフレームの側面断面図である。It is side surface sectional drawing of the flame | frame of the Example in this invention. 図２の拡大図である。FIG. 3 is an enlarged view of FIG. 2. 本発明における実施例の電動送風機の電動機部を示す図１のＡ－Ａ断面図である。It is AA sectional drawing of FIG. 1 which shows the electric motor part of the electric blower of the Example in this invention.
　以下に、本発明の実施の形態を示す。 Embodiments of the present invention are shown below.
　図１は、本発明における実施例の電動送風機１の外観の側面図を示す。図中の上部から、ファンケーシング１０、フレーム２１、ステータ３５と配置されている。また、図２は、図１の断面図であり、本発明における実施例の電動送風機の１側面断面図を示す。シャフト３３の一端にはインペラ１１が、他端にはロータ３４が配置され、インペラ１１とロータ３４の間に一対のベアリング３１が配置されている。ロータ３４は磁石や電磁鋼板などから構成されている。一対のベアリング３１は、ベアリングカバー３２内で整列するように固定され、ベアリングカバー３２はフレーム２１と一体となるように成形されている。 FIG. 1 shows a side view of the appearance of an electric blower 1 according to an embodiment of the present invention. From the upper part in the figure, the fan casing 10, the frame 21, and the stator 35 are arranged. FIG. 2 is a cross-sectional view of FIG. 1 and shows a side cross-sectional view of the electric blower of the embodiment of the present invention. An impeller 11 is disposed at one end of the shaft 33, and a rotor 34 is disposed at the other end, and a pair of bearings 31 are disposed between the impeller 11 and the rotor 34. The rotor 34 is composed of a magnet, an electromagnetic steel plate or the like. The pair of bearings 31 are fixed so as to be aligned in the bearing cover 32, and the bearing cover 32 is formed so as to be integrated with the frame 21.
　フレーム２１は、図３に示した斜視図のように、ベアリングカバー３２を保持する軸受け保持部２２と、その外周部２３の円環部分の２重構造を有している。また、図４に示した断面図から分かるように、フレーム２１の軸受け保持部２２と円環状の外周部２３はブリッジ２４でつながれている。図５に示すように、フレーム２１のインペラ１１側（上側）にはディフューザ１２がねじで固定され、フレーム２１のロータ３４側（下側）にはステータ３５が固定されている。インペラ１１とディフューザ１２を覆うように配置されたファンケーシング１０は、フレーム外周部２３に固定されている。 As shown in the perspective view of FIG. 3, the frame 21 has a double structure of a bearing holding portion 22 that holds the bearing cover 32 and an annular portion of the outer peripheral portion 23. As can be seen from the cross-sectional view shown in FIG. 4, the bearing holding portion 22 of the frame 21 and the annular outer peripheral portion 23 are connected by a bridge 24. As shown in FIG. 5, the diffuser 12 is fixed with screws to the impeller 11 side (upper side) of the frame 21, and the stator 35 is fixed to the rotor 34 side (lower side) of the frame 21. The fan casing 10 disposed so as to cover the impeller 11 and the diffuser 12 is fixed to the frame outer peripheral portion 23.
　従来の構造においては、ステータの外周部に円環状のフレームを配置し、その円環状のフレームの内側にステータを固定していた。そのため、ステータの電磁振動やロータの機械振動がフレームに伝わり、振動騒音の原因となる恐れがある。また、その円環状のフレームで電動送風機を掃除機本体に保持した場合、フレームの振動が掃除機本体に伝わりやすく、掃除機の振動騒音が大きくなる恐れがある。また、シャフトの両端にインペラとロータを配置し、その間に一対のベアリングを配置した構成においては、電動送風機の重心位置はベアリングを保持する位置に近いところとなる。従来の構造においては、ベアリングを保持する位置には通風口が配置されるため、ベアリングを保持する位置で電動送風機を掃除機本体へ支持することが出来ない。そのため、重心位置での振動が原因となる電動送風機の軸振動を抑制しづらいという課題があった。 In the conventional structure, an annular frame is arranged on the outer periphery of the stator, and the stator is fixed inside the annular frame. Therefore, the electromagnetic vibration of the stator and the mechanical vibration of the rotor are transmitted to the frame, which may cause vibration noise. Moreover, when an electric blower is hold | maintained at the cleaner main body with the annular frame, the vibration of a flame | frame is easy to be transmitted to a cleaner main body, and there exists a possibility that the vibration noise of a cleaner may become large. Further, in the configuration in which the impeller and the rotor are disposed at both ends of the shaft and the pair of bearings are disposed therebetween, the position of the center of gravity of the electric blower is close to the position where the bearing is held. In the conventional structure, since the vent hole is arranged at the position where the bearing is held, the electric blower cannot be supported on the cleaner body at the position where the bearing is held. Therefore, there has been a problem that it is difficult to suppress the shaft vibration of the electric blower caused by the vibration at the center of gravity.
　本実施例においては、ステータ３５の外周部に円環状のフレームを配置せず、軸受け保持部２２の外側に円環状の外周部２３を設け、２重構造としており、外周部２３で電動送風機を包むインナーケース（図示なし）に電動送風機１を支持する。インナーケースは掃除機本体に支持される。そのため、ステータ３５の電磁振動やロータ３４の機械振動がフレーム２１や掃除機本体へ伝搬しにくくなり、電動送風機やそれを用いた電気掃除機の低振動・低騒音化を得ることが出来る。電動送風機単体でいえば、ステータ３５の径方向振動がハウジングの外周部に伝わりづらくなるという効果を奏する。外周部に伝わりづらくなるので、ハウジングからの音が小さくなるという効果を奏する。また、ベアリング３１を保持する位置である外周部で、電動送風機をインナーケースを介して電気掃除機本体に支持するため、重心位置に近い部分で電動送風機を電気掃除機本体に支持することが可能となる。そのため、電動送風機の軸振動を抑制しやすくなり、電気掃除機の低振動・低騒音化を得ることが出来る。 In the present embodiment, an annular frame is not disposed on the outer peripheral portion of the stator 35, and an annular outer peripheral portion 23 is provided outside the bearing holding portion 22 to form a double structure. The electric blower 1 is supported on an inner case (not shown) to be wrapped. The inner case is supported by the cleaner body. Therefore, the electromagnetic vibration of the stator 35 and the mechanical vibration of the rotor 34 are difficult to propagate to the frame 21 and the vacuum cleaner body, and low vibration and low noise of the electric blower and the vacuum cleaner using the same can be obtained. Speaking of the electric blower alone, there is an effect that the radial vibration of the stator 35 is difficult to be transmitted to the outer peripheral portion of the housing. Since it is difficult to be transmitted to the outer peripheral portion, there is an effect that the sound from the housing is reduced. In addition, since the electric blower is supported on the main body of the vacuum cleaner via the inner case at the outer peripheral portion where the bearing 31 is held, the electric blower can be supported on the main body of the vacuum cleaner near the position of the center of gravity. It becomes. Therefore, it becomes easy to suppress the shaft vibration of the electric blower, and low vibration and low noise of the electric vacuum cleaner can be obtained.
　図５に、図２の拡大図を示す。ファンケーシング１０がフレーム２１の外周部２３に設けられた爪状の突起２５でシャフトの軸方向（上下方向）に固定されている。ファンケーシング１０とフレーム２１との固定は、ファンケーシング１０の側面部に設けた穴１０ａに、フレーム２１の外周部２３から径方向に突出した突起２５を入れることで行われる。
ファンケーシング１０における穴１０ａの位置と、フレーム２１における突起２５の位置を定めることにより、接着剤による固定に比べ気密を取った固定とすることができる。更に、ファンケーシング１０におけるディフューザ１２と接する面には、弾性体を用いた気密保持部材１３が配置されている。ファンケーシング１０を軸方向に固定しない場合、ファンケーシング１０のディフューザ１２の間に弾性体を挟み込んだとしても気密が十分に取れず、電動送風機の効率が低下する恐れがある。本実施例のように、ファンケーシング１０をフレーム２１の爪状の突起２５により軸方向に固定することで、弾性体を挟み込んだとしてもファンケーシング１０とインペラ１１の軸方向の位置決め精度を確保できるため、ファンケーシング１０とインペラ１１の間の漏れを少なくすることができ、電動送風機効率が向上する。なお、ファンケーシング１０の軸方向の固定に関しては、フレーム２１側に突起２５を設けファンケーシング１０に穴を設けるだけでなく、フレーム２１側に凹部を設けたりしても構わない。 FIG. 5 shows an enlarged view of FIG. The fan casing 10 is fixed in the axial direction (vertical direction) of the shaft by a claw-like protrusion 25 provided on the outer peripheral portion 23 of the frame 21. The fan casing 10 and the frame 21 are fixed by inserting a protrusion 25 protruding in the radial direction from the outer peripheral portion 23 of the frame 21 into a hole 10 a provided in the side surface portion of the fan casing 10.
By determining the position of the hole 10a in the fan casing 10 and the position of the protrusion 25 in the frame 21, it is possible to achieve fixing that is airtight compared to fixing by an adhesive. Further, an airtight holding member 13 using an elastic body is disposed on the surface of the fan casing 10 that contacts the diffuser 12. If the fan casing 10 is not fixed in the axial direction, even if an elastic body is sandwiched between the diffusers 12 of the fan casing 10, the airtightness cannot be sufficiently obtained, and the efficiency of the electric blower may be reduced. As in the present embodiment, the fan casing 10 is fixed in the axial direction by the claw-like projections 25 of the frame 21, so that the axial positioning accuracy of the fan casing 10 and the impeller 11 can be ensured even when the elastic body is sandwiched. Therefore, leakage between the fan casing 10 and the impeller 11 can be reduced, and the efficiency of the electric blower is improved. In addition, regarding fixing of the fan casing 10 in the axial direction, not only the protrusion 25 is provided on the frame 21 side and the hole is provided in the fan casing 10, but the recess may be provided on the frame 21 side.
　高速回転機においては、電動機に発生する損失のうちベアリング３１で発生する熱による損失が大きくなる。熱による損失を減らすため、ベアリング３１の冷却が重要となり、軸受け保持部２２やベアリングカバー３２へ冷却風をあてる必要がある。そこで、図４に示すように、フレーム２１の外周部２３の内側に、ディフューザ１２側からステータ３５側に向かって流路が狭くなるような傾斜部２６を設けることで、ディフューザ１２からの風が軸受け保持部２２やベアリングカバー３２の方向に曲げられるため、ベアリング３１を冷却しやすくなる。ベアリング３１が冷却されることで、ベアリング３１で発生する熱による損失が大きくなる。更に、ベアリング３１の長寿命化を得ることが出来る。 In the high-speed rotating machine, the loss due to heat generated in the bearing 31 among the loss generated in the electric motor becomes large. In order to reduce heat loss, cooling of the bearing 31 is important, and it is necessary to apply cooling air to the bearing holder 22 and the bearing cover 32. Therefore, as shown in FIG. 4, by providing an inclined portion 26 that narrows the flow path from the diffuser 12 side toward the stator 35 side inside the outer peripheral portion 23 of the frame 21, the wind from the diffuser 12 can be made. Since the bearing holder 22 and the bearing cover 32 are bent, the bearing 31 can be easily cooled. As the bearing 31 is cooled, loss due to heat generated in the bearing 31 increases. Further, the life of the bearing 31 can be extended.
　ディフューザ１２におけるフレーム２１側からインペラ１１側へ風が逆流し、電動送風機の効率を低下させる恐れがある。そのため、ディフューザ１２とフレーム２１の間の気密をとることが重要である。そこで、図５に示すように、ディフューザ１２とフレーム２１の固定部の外側に、ディフューザ１２とフレーム２１の凹凸が嵌め合う部分２７を設けている。これにより、気密用の追加部材を設けなくとも、少ないスペースで十分な気密をとることが出来るようになる。 There is a risk that the wind will flow backward from the frame 21 side to the impeller 11 side in the diffuser 12 to reduce the efficiency of the electric blower. For this reason, it is important to ensure airtightness between the diffuser 12 and the frame 21. Therefore, as shown in FIG. 5, a portion 27 where the unevenness of the diffuser 12 and the frame 21 fits is provided outside the fixed portion of the diffuser 12 and the frame 21. As a result, sufficient airtightness can be obtained in a small space without providing an additional member for airtightness.
　図６に示すように、電動機を三相駆動とすることで、従来の単相駆動の場合に比べるとステータ３５の積厚を小さくすることが出来る。ステータ３５の積厚を小さくすることで、モータの重心位置がベアリング間でもインペラ側に近づくことになる。そのためフレームの外周部２３を重心位置程度までの長さとする場合、フレームの軸方向長さを短くすることが出来る。これにより、フレーム外周部２３からの放射音を小さくすることが出来る。但し、ステータ３５やロータ３４の構造に関しては三相駆動が可能であればこれに限らない。 As shown in FIG. 6, by making the electric motor three-phase drive, the thickness of the stator 35 can be reduced as compared with the conventional single-phase drive. By reducing the thickness of the stator 35, the center of gravity of the motor approaches the impeller side even between the bearings. Therefore, when the outer peripheral portion 23 of the frame has a length up to the position of the center of gravity, the axial length of the frame can be shortened. Thereby, the radiation sound from the frame outer peripheral part 23 can be made small. However, the structure of the stator 35 and the rotor 34 is not limited to this as long as three-phase driving is possible.
　本実施例の電動送風機を電気掃除機に用いることで、電気掃除機の低騒音化や高効率化、長運転時間を得ることが出来る。 用 い る By using the electric blower of this embodiment for a vacuum cleaner, it is possible to obtain low noise, high efficiency, and long operation time of the vacuum cleaner.
１　電動送風機
１０　ファンケーシング
１１　インペラ
１２　ディフューザ
１３　気密保持部材
２１　フレーム
２２　軸受け保持部
２３　外周部
２４　ブリッジ
２５　突起部
２６　傾斜部
２７　嵌め合い部
２８　ハウジング
３１　ベアリング
３２　ベアリングカバー
３３　シャフト
３４　ロータ
３５　ステータ DESCRIPTION OF SYMBOLS 1 Electric blower 10 Fan casing 11 Impeller 12 Diffuser 13 Airtight holding member 21 Frame 22 Bearing holding part 23 Outer peripheral part 24 Bridge 25 Projection part 26 Inclination part 27 Fitting part 28 Housing 31 Bearing 32 Bearing cover 33 Shaft 34 Rotor 35 Stator

Claims (7)

  1. 　コアとコイルを有したステータと、シャフトを有したロータと、シャフトに固定されたインペラと、ロータとインペラ間に配置された一対の軸受けと、その一対の軸受けを保持するフレームを有したブラシレスモータと、フレームに固定されたディフューザと、フレームに固定されたファンケーシングを有した電動送風機において、
    　前記フレームは、前記軸受けを保持する軸受け保持部と、該軸受け保持部よりも外側に位置する外周部と、の二重構造であり、
    　前記外周部で他部品へ支持可能であり、前記外周部に前記ファンケーシングを軸方向に固定することを特徴とする電動送風機。     A brushless motor having a stator having a core and a coil, a rotor having a shaft, an impeller fixed to the shaft, a pair of bearings disposed between the rotor and the impeller, and a frame for holding the pair of bearings And an electric blower having a diffuser fixed to the frame and a fan casing fixed to the frame,
    The frame has a double structure of a bearing holding portion that holds the bearing and an outer peripheral portion that is positioned outside the bearing holding portion,
    An electric blower characterized in that the outer peripheral portion can be supported by other parts, and the fan casing is fixed to the outer peripheral portion in the axial direction.
  2. 　請求項１に記載された電動送風機において、ファンケーシングとディフューザの間に弾性体を挟み込んだことを特徴とする電動送風機。 The electric blower according to claim 1, wherein an elastic body is sandwiched between the fan casing and the diffuser.
  3. 　請求項１又は請求項２に記載された電動送風機において、フレームの外周部の内側がディフューザ側からステータ側に向かって流路が狭くなるような構造を有することを特徴とする電動送風機。 3. The electric blower according to claim 1, wherein the inner periphery of the outer peripheral portion of the frame has a structure such that the flow path becomes narrower from the diffuser side toward the stator side.
  4. 　請求項１乃至請求項３の何れか１項に記載された電動送風機において、フレームとディフューザの固定部よりも外側に凹凸の嵌め合い部を設けたことを特徴とする電動送風機。 The electric blower according to any one of claims 1 to 3, wherein an uneven fitting portion is provided outside a fixed portion between the frame and the diffuser.
  5. 　請求項１乃至請求項４の何れか１項に記載された電動送風機において、モータを三相駆動としたことを特徴とする電動送風機。 The electric blower according to any one of claims 1 to 4, wherein the motor is three-phase driven.
  6. 　請求項１乃至請求項５の何れか１項に記載された電動送風機において、
    　前記外周部は、円環部分であることを特徴とする電動送風機。     In the electric blower according to any one of claims 1 to 5,
    The electric blower characterized in that the outer peripheral portion is an annular portion.
  7. 　請求項１乃至請求項６の何れか１項に記載された電動送風機を用いたことを特徴とする電気掃除機。 An electric vacuum cleaner using the electric blower according to any one of claims 1 to 6.
PCT/JP2016/050414 2015-01-28 2016-01-08 Electric air blower and electric vacuum cleaner using same WO2016121447A1 (en)

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US20190162192A1 (en) * 2014-11-28 2019-05-30 Positec Power Tools (Suzhou) Co., Ltd. Blower

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US20190162192A1 (en) * 2014-11-28 2019-05-30 Positec Power Tools (Suzhou) Co., Ltd. Blower
TWI641352B (en) * 2017-05-01 2018-11-21 日商三菱電機股份有限公司 Electric blower, electric vacuum cleaner and hand dryer

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