WO2021235197A1 - Electric blower - Google Patents

Electric blower Download PDF

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Publication number
WO2021235197A1
WO2021235197A1 PCT/JP2021/016756 JP2021016756W WO2021235197A1 WO 2021235197 A1 WO2021235197 A1 WO 2021235197A1 JP 2021016756 W JP2021016756 W JP 2021016756W WO 2021235197 A1 WO2021235197 A1 WO 2021235197A1
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WO
WIPO (PCT)
Prior art keywords
shroud
impeller
electric blower
axial
fan
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PCT/JP2021/016756
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French (fr)
Japanese (ja)
Inventor
静 横手
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パナソニックＩｐマネジメント株式会社
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Publication of WO2021235197A1 publication Critical patent/WO2021235197A1/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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers

Definitions

  • This disclosure relates to an electric blower used in various devices including household electric devices.
  • a DC electric blower using a DC motor As a conventional electric blower for a vacuum cleaner, a DC electric blower using a DC motor is used. This type of electric blower is configured to discharge most of the sucked wind to the rear as much as possible. The air sucked by the rotary fan is passed through the inside of the frame and discharged to the outside.
  • the electric motor 2 having the rotating shaft 1, the impeller 3 fixed to the rotating shaft 1 and driven to rotate by the electric motor 2, and the air discharged from the impeller 3 are used. It has an inflowing air guide 4, an impeller 3, and a fan case 5 containing the air guide 4.
  • the impeller 3 includes a rear shroud 6, a front shroud 7 spaced apart from the rear shroud 6, an intake port 8 provided in the center of the front shroud 7, and a plurality of wing portions 9 attached to the rear shroud 6. And prepare.
  • FIG. 13 is a side view of the conventional electric blower
  • FIG. 14 is a perspective view of the main part of the electric blower
  • FIG. 15 is a perspective view showing the impeller 3 of the electric blower.
  • the fan case 5 is omitted.
  • Patent Document 1 is known.
  • FIG. 16 is a side view showing the air flow of a conventional electric blower.
  • the conventional electric blower as shown in FIG. 16, since the inflowing air is discharged to the outer peripheral side (air guide 4 side) of the impeller 3, the lower part of the central part of the space between the two shrouds 6 and 7.
  • the side (rear shroud 6 side) On the side (rear shroud 6 side), a low-speed basin with slow air flow is created. This has the problem that the fan efficiency may deteriorate.
  • This disclosure solves the above problems. It is an object of the present disclosure to provide an electric fan capable of improving fan efficiency.
  • the electric blower includes an electric motor having a rotating shaft, an impeller fixed to the rotating shaft and rotationally driven by the electric motor, and an impeller provided on the outer peripheral portion of the impeller and discharged from the impeller.
  • the impeller is provided with an air guide through which air flows in, and the impeller has a rear shroud, a front shroud arranged at a distance from the rear shroud, an intake port provided in the center of the upper surface of the front shroud, and the rear shroud.
  • a centrifugal fan composed of a plurality of first blades attached to both or one of the front shroud and arranged at equal intervals in the circumferential direction, and an axial flow fan located inside the centrifugal fan in the radial direction.
  • the centrifugal fan and the axial flow fan rotate in the circumferential direction, and the axial flow fan faces upward in the direction of the rotation axis and is inclined with respect to the rotation axis.
  • the two wings are arranged at equal intervals in the circumferential direction.
  • the number of blades of the plurality of first blades and the number of blades of the plurality of second blades are equivalent.
  • the electric blower according to the third aspect of the present disclosure includes the rotational trailing edge portion of the plurality of second wing portions and the rotational direction leading edge portion of the plurality of first wing portions.
  • the angle formed by the wing is in the range of 15 to 40 degrees.
  • the electric blower according to the fourth aspect of the present disclosure has, in any one of the first to third aspects, the axial direction between the axial upper surface of the impeller facing the air guide and the rear shroud.
  • the dimension of h0, the axial dimension between the rear surface shroud and the rotational trailing edges of the plurality of second blades is t1, and the axial direction between the rear surface shroud and the axial center of the facing portion.
  • FIG. 1 Side view of the electric blower according to the embodiment of the present disclosure.
  • FIG. 1 An exploded perspective view of the main part of the electric blower Perspective view of the impeller of the electric blower Side view of the impeller of the electric blower.
  • Relative velocity vector distribution diagram when the number of blades of the plurality of first blades of the same electric blower is six, and when the number of blades of the plurality of second blades is six.
  • Relative velocity vector distribution diagram when the number of blades of the plurality of first blades of the same electric blower is six and the number of blades of the plurality of second blades is nine.
  • Top view showing the angle between the trailing edge portion in the rotation direction of the plurality of second blade portions and the leading edge portion in the rotation direction of the plurality of first blade portions in the electric blower. The figure which shows the rotation direction trailing edge part, the leading edge part, and the rotation direction leading edge part, the trailing edge part of a plurality of first wing parts in the electric blower.
  • the figure which shows the relationship between the rotational position and static pressure characteristic which a plurality of rotation direction trailing edges of a 2nd wing part and the rotation direction leading edge part of a plurality of 1st wing parts form.
  • the figure which shows the flow velocity of the air in the same electric blower when the rotation position formed by the rotation direction trailing edge part of a plurality of 2nd wing parts and the rotation direction front edge part of a plurality of 1st wing parts is 4 degrees.
  • the magnitude of the circumferential component of the air flow velocity when the rotation position formed by the rotation direction trailing edges of the plurality of second blades and the rotation direction leading edges of the first blades is 27 degrees.
  • FIG. 1 is a side view of the electric blower according to the embodiment of the present disclosure.
  • FIG. 2 is an exploded perspective view of the main part of the electric blower.
  • FIG. 3 is a perspective view of the impeller of the electric blower.
  • the electric blower 11 is located on the outer peripheral portion of the motor 12, the impeller 13 fixed to the rotary shaft RC and rotationally driven by the motor 12, and is discharged from the impeller 13. It includes an air guide 14 into which the air flows in, and a fan case 15 including an impeller 13 and an air guide 14.
  • the impeller 13 includes a rear shroud 16, a front shroud 17 spaced apart from the rear shroud 16, an intake port 18 provided in the center of the front shroud 17, and / or both of the rear shroud 16 and the front shroud 17. It has a plurality of first wing portions 19 attached to and arranged at equal intervals in the circumferential direction.
  • the centrifugal fan 20 is composed of a plurality of first wing portions 19.
  • the second wing portions 21 are arranged at equal intervals in the circumferential direction.
  • the axial flow fan 22 is composed of a plurality of second wing portions 21 (omitted in FIG. 2).
  • the impeller 13 side from the electric motor 12, that is, the direction from the rear shroud 16 to the front shroud 17 is upward in the axial direction
  • the rotation direction of the impeller 13 is the circumferential direction
  • the rotation direction is orthogonal to the circumferential direction toward the rotation axis RC.
  • the direction is sometimes called the radial direction.
  • the motor 12 is a motor having at least a rotor portion 121, a stator portion 122, and a bracket 123 covering them.
  • the rotor portion 121 is fixed to the rotating shaft RC (shaft 124), and the coil portion 125 is provided.
  • the bracket 123 is formed in a cylindrical shape, and an exhaust port (not shown) is opened below the bracket 123.
  • the impeller 13 is rotatably connected to the rotary shaft RC.
  • the fan case 15 (omitted in FIG. 2) has a cylindrical shape and is attached to the upper part of the bracket 123. Inside the fan case 15, an impeller 13 and an air guide 14 facing the impeller 13 and forming a space through which the air discharged from the impeller 13 flows are housed.
  • the impeller 13 includes a rear shroud 16, a front shroud 17 spaced apart from the rear shroud 16, an intake port 18 provided in the center of the front shroud 17, and / or both of the rear shroud 16 and the front shroud 17.
  • a plurality of first wing portions 19 (centrifugal fan 20) and a plurality of second wing portions 21 (axial flow fan 22) attached to the above are provided.
  • the rear shroud 16 has a disk shape.
  • the front shroud 17 has a ring shape with a curved cross section.
  • An intake port 18 is provided at the radial center portion of the surface (upper surface) of the front shroud 17 that does not face the rear shroud.
  • the rear shroud 16 and the front shroud 17 are arranged coaxially.
  • the rear shroud 16 and the front shroud 17 are made of, for example, resin or sheet metal.
  • the rear shroud 16 and the front shroud 17 are arranged at regular intervals.
  • the upper surface refers to a surface that is higher in the axial direction, and the same applies to the following description.
  • the plurality of first wing portions 19 are integrally molded with the rear shroud 16 or the front shroud 17, for example, made of resin or sheet metal.
  • the plurality of first wing portions 19 are formed so as to extend radially around the rotation axis RC.
  • the plurality of first wing portions 19 are formed so as to stand up from the rear shroud 16 in the direction of the rotation axis RC.
  • the rear tilting blade shape is inclined toward the reverse side toward the outer periphery of the rear surface shroud 16 in the rotation direction (counterclockwise in the drawing).
  • the plurality of wings of the first wing portion 19 are provided at equal intervals in the circumferential direction.
  • the number of the plurality of first wing portions 19 is, for example, six.
  • a plurality of second wing portions 21 are attached to the radial center portion of the upper surface of the rear shroud 16.
  • the plurality of second wing portions 21 are made of, for example, resin or sheet metal.
  • the plurality of second wing portions 21 are arranged inside the plurality of first wing portions 19 (centrifugal fan 20) in the radial direction.
  • the plurality of second wing portions 21 are oriented upward in the rotation axis RC direction, and are inclined with respect to the rotation axis RC so that the leading edge in the rotation direction is located above the trailing edge. ..
  • the blades of the plurality of second wing portions 21 are provided at equal intervals in the circumferential direction.
  • the number of the plurality of second wing portions 21 is, for example, six.
  • the centrifugal fan 20 and the axial fan 22 are separate bodies, and both are fixed to the rotating shaft RC. Therefore, it rotates synchronously. If the axial flow fan 22 is formed of sheet metal, it is easy to manufacture.
  • the centrifugal fan 20 and the axial flow fan 22 may be integrally formed with the rear shroud 16, or may be formed separately and then attached to the rear shroud 16.
  • the total pressure of the air extruded between the wing portions of the second wing portion 21 is increased by the rotation of the impeller 13, and flows into the air guide 14 through the wing portions of the plurality of first wing portions 19.
  • the air rectified by the air guide 14 is sent into the bracket 123 of the motor 12.
  • the air that has passed through the bracket 123 flows out of the bracket 123 from the exhaust port (not shown).
  • the electric blower 11 is provided with an axial flow fan 22 at the radial center of the space between the rear shroud 16 and the front shroud 17. Therefore, as shown in FIG. 4, a plurality of centrifugal fans 20 are used at high speed without causing a low-speed basin in which the flow is slow even for the air flowing into the fan case 15 from the radial center side of the intake port 18. It can be drained between the wing portions of the first wing portion 19 of the above.
  • FIG. 4 is a side view of the impeller of the electric blower according to the embodiment of the present disclosure. Therefore, air can be discharged to the outer peripheral side (air guide 14) by the centrifugal fan 20. This can be expected to have the effect of improving fan efficiency.
  • the number of blades of the plurality of first wing portions 19 and the number of blades of the plurality of second wing portions 21 are 6 and are equivalent.
  • FIG. 5A shows the relationship between the number of blades of the plurality of second blade portions 21 and the static pressure characteristic when the number of blades of the plurality of first blade portions 19 of the electric blower according to the embodiment of the present disclosure is six. It is a figure.
  • FIG. 5B is a diagram showing the relationship between the number of blades of the plurality of second blade portions 21 and the efficiency characteristics when the number of blades of the plurality of first blade portions 19 of the electric blower is six.
  • FIG. 6A shows a relative velocity vector when the number of blades of the plurality of first blade portions 19 of the electric blower according to the embodiment of the present disclosure is six, and when the number of blades of the plurality of second blade portions 21 is six. It is a distribution (cross section perpendicular to the rotation axis RC) diagram.
  • FIG. 6B is a relative velocity vector distribution diagram when the number of blades of the plurality of first blade portions 19 of the electric blower is six and the number of blades of the plurality of second blade portions 21 is nine.
  • FIG. 7 shows an angle formed by the rotation direction trailing edge portion 21a of the plurality of second wing portions 21 and the rotation direction leading edge portion 19a of the plurality of first wing portions 19 in the electric blower according to the embodiment of the present disclosure. It is a top view which shows.
  • the angle ⁇ is in the range of 15 to 40 degrees.
  • FIG. 8 shows, in the electric blower according to the embodiment of the present disclosure, the rotation direction trailing edge portion and the leading edge portion of the plurality of second wing portions 21, and the rotation direction leading edge portion and the trailing edge portion of the plurality of first wing portions 19. It is a figure which shows the part.
  • the rotation direction leading edge portion 19a of the first wing portion 19 refers to the frontmost portion in the rotation direction of the first wing portion 19.
  • the trailing edge portion 21a in the rotation direction of the second wing portion 21 refers to the rearmost portion of the second wing portion 21 in the rotation direction.
  • the trailing edge portion 19b in the rotation direction of the first wing portion 19 refers to the rearmost portion of the first wing portion 19 in the rotation direction.
  • the leading edge portion 21b in the rotation direction of the second wing portion 21 refers to the frontmost portion in the rotation direction of the second wing portion 21.
  • the trailing edge portion 21a in the rotation direction of the second wing portion 21 is located below the leading edge portion 21b in the rotation direction of the second wing portion 21 in the axial direction.
  • FIG. 9A shows an angle ⁇ formed by the rotational trailing edge 21a of the plurality of second wing portions 21 and the rotational leading edge 19a of the first wing 19 in the electric blower according to the embodiment of the present disclosure. It is a figure which shows the relationship between static pressure characteristic and static pressure characteristic.
  • FIG. 9B shows the relationship between the rotational position and the efficiency characteristic formed by the rotational trailing edge 21a of the plurality of second wing portions 21 and the rotational leading edge 19a of the first wing 19 in the electric blower. It is a figure which shows.
  • the axial flow fan 22 and the centrifugal fan 20 are set to the optimum relative positions so that the main flow (high speed flow) of the axial flow fan 22 flows into the centrifugal fan 20 at a position where the loss is low.
  • FIG. 10A shows an angle ⁇ formed by the rotational trailing edge 21a of the plurality of second wing portions 21 and the rotational leading edge 19a of the first wing 19 in the electric blower according to the embodiment of the present disclosure. It is a figure which shows the magnitude distribution (cross section perpendicular to the rotation axis RC) of the circumferential component of the air flow velocity when is 4 degrees.
  • FIG. 10B shows the air when the angle ⁇ formed by the rotational trailing edge 21a of the plurality of second wing portions 21 and the rotational leading edge 19a of the first wing 19 in the electric blower is 27 degrees. It is a figure which shows the size distribution of the circumferential component of the flow velocity of. When the angle ⁇ is 27 degrees, the circumferential component of the flow velocity is larger and the output is larger.
  • FIG. 11 shows, in the electric blower according to the embodiment of the present disclosure, a portion facing the air guide 14 of the impeller 13 (air guide facing portion) 14a (located radially outside the impeller 13 and an outlet portion of the centrifugal fan 20).
  • FIG. 12A is a diagram showing the relationship between the height (%) and the static pressure characteristic in the electric blower according to the embodiment of the present disclosure.
  • FIG. 12B is a diagram showing the relationship between the height (%) and the efficiency characteristics in the electric blower.
  • the trailing edge portion 21a of the axial flow fan 22 may be arranged at a position facing the center portion L0 of the outlet height of the centrifugal fan 20 (the portion facing the air guide 14 14a). Since the wing portion has a large amount of work at the trailing edge, the trailing edge portion 21a of the axial flow fan 22 is arranged at a position facing the axial height center of the trailing edge portion 19b of the centrifugal fan 20, and the axial flow fan 22 is arranged. Prevents a decrease in the work load at the lower portion of the trailing edge portion 21a.
  • the electric blower 11 includes an electric motor 12 having a rotary shaft RC, an impeller 13 fixed to the rotary shaft RC and rotationally driven by the motor 12, and an outer peripheral portion of the impeller 13.
  • the impeller 13 is provided with an air guide 14 from which the air discharged from the impeller 13 flows in, and the impeller 13 includes a rear shroud 16, a front shroud 17 arranged at a distance from the rear shroud 16, and the center of the upper surface of the front shroud 17.
  • An intake port 18 provided in the portion, a centrifugal fan 20 composed of a plurality of first wing portions 19 attached to both or one of the rear shroud 16 and the front shroud 17 and arranged at equal intervals in the circumferential direction, and a centrifugal fan 20. It has an axial flow fan 22 located inside the centrifugal fan 20 in the radial direction, the centrifugal fan 20 and the axial flow fan 22 rotate in the circumferential direction, and the axial flow fan 22 faces upward in the direction of the rotating shaft RC.
  • a plurality of second wing portions 21 which are inclined with respect to the rotation axis RC are arranged at equal intervals in the circumferential direction.
  • the number of blades of the plurality of first blade portions 19 and the number of blades of the plurality of second blade portions 21 are the same.
  • the angle formed by the trailing edge portion 21a in the rotation direction of the plurality of second wing portions 21 and the leading edge portion 19a in the rotation direction of the plurality of first wing portions 19 is within the range of 15 degrees to 40 degrees.
  • the axial dimension between the axial upper surface of the impeller 13 facing the air guide 14 (air guide facing portion) and the rear surface shroud 16 is h0, and the rotation of the rear surface shroud 16 and the plurality of second wing portions 21.
  • the axial dimension between the directional trailing edge 21a is t1
  • the axial dimension between the rear shroud 16 and the axial center of the air guide facing portion is t0
  • t1-t0 is h. It is preferably ⁇ 20% ⁇ h / h0 ⁇ 70%.
  • the electric blower according to the present disclosure can be widely used for electric blowers and the like used in various devices including household electric devices.

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

Abstract

An electric blower (11) is provided with an electric motor (12) including a rotating shaft, an impeller (13) which is fixed to the rotating shaft and which is rotationally driven by the electric motor, and an air guide (14) into which air discharged from the impeller flows, wherein: the impeller includes a rear surface shroud (16), a front surface shroud (17) disposed spaced apart from the rear surface shroud, an intake port (18) provided in a central portion of an upper surface of the front surface shroud, a centrifugal fan (20) consisting of a plurality of first blade portions (19) which are attached to the rear surface shroud and which are arranged at equal intervals in the circumferential direction, and an axial flow fan (22) positioned inward of the centrifugal fan in the radial direction; the centrifugal fan and the axial flow fan rotate in the circumferential direction; and the axial flow fan faces upward in the direction of the rotating shaft, and comprises a plurality of second blade portions (axial flow fan) (21) which are inclined relative to the rotating shaft and which are arranged at equal intervals in the circumferential direction.

Description

電動送風機Electric blower
　本開示は、家庭用電気機器をはじめとして種々の機器に用いられている電動送風機に関する。 This disclosure relates to an electric blower used in various devices including household electric devices.
　従来の掃除機用の電動送風機としては、直流電動機を用いた直流電動送風機が使用される。この種の電動送風機では、吸い込んだ風の多くをできるだけ後方へ排出できる構成がとられている。回転ファンによって吸い込んだ空気を、フレームの内部を通過させて外部に排出する構成としている。 As a conventional electric blower for a vacuum cleaner, a DC electric blower using a DC motor is used. This type of electric blower is configured to discharge most of the sucked wind to the rear as much as possible. The air sucked by the rotary fan is passed through the inside of the frame and discharged to the outside.
　例えば、図１３～図１５に示される従来の電動送風機は、回転軸１を有する電動機２と、回転軸１に固定され電動機２によって回転駆動されるインペラ３と、インペラ３から排出された空気が流入するエアガイド４と、インペラ３とエアガイド４を内包するファンケース５とを有している。インペラ３には、後面シュラウド６と、後面シュラウド６と間隔を置いて配した前面シュラウド７と、前面シュラウド７の中央に設けた吸気口８と、後面シュラウド６に取り付けられた複数の翼部９とを備える。 For example, in the conventional electric blowers shown in FIGS. 13 to 15, the electric motor 2 having the rotating shaft 1, the impeller 3 fixed to the rotating shaft 1 and driven to rotate by the electric motor 2, and the air discharged from the impeller 3 are used. It has an inflowing air guide 4, an impeller 3, and a fan case 5 containing the air guide 4. The impeller 3 includes a rear shroud 6, a front shroud 7 spaced apart from the rear shroud 6, an intake port 8 provided in the center of the front shroud 7, and a plurality of wing portions 9 attached to the rear shroud 6. And prepare.
　ここで、図１３は従来の電動送風機の側面図、図１４は同電動送風機の主要部の斜視図、図１５は同電動送風機のインペラ３を示す斜視図である。図１４ではファンケース５を省略している。 Here, FIG. 13 is a side view of the conventional electric blower, FIG. 14 is a perspective view of the main part of the electric blower, and FIG. 15 is a perspective view showing the impeller 3 of the electric blower. In FIG. 14, the fan case 5 is omitted.
　インペラ３が回転すると、空気を吸気口８側からファンケース５内に流入させる。ファンケース５内に流入した空気は翼部９間に流入する。２枚のシュラウド６、７の間で翼部９間に押し出された空気は、インペラ３の回転により全圧が高められ、インペラ３の外周部に形成されたエアガイド４に流入する。エアガイド４で整流された空気は、モータケース１０内へ送り込まれる。モータケース１０内を通過した空気は、排気口からモータケースの外部へ流出する。 When the impeller 3 rotates, air flows into the fan case 5 from the intake port 8 side. The air that has flowed into the fan case 5 flows between the blades 9. The air extruded between the blades 9 between the two shrouds 6 and 7 is increased in total pressure by the rotation of the impeller 3 and flows into the air guide 4 formed on the outer peripheral portion of the impeller 3. The air rectified by the air guide 4 is sent into the motor case 10. The air that has passed through the motor case 10 flows out from the exhaust port to the outside of the motor case.
　なお、先行技術文献としては、例えば、特許文献１が知られている。 As the prior art document, for example, Patent Document 1 is known.
　図１６は、従来の電動送風機の空気の流れを示す側面図である。従来の電動送風機では、図１６に示すように、流入した空気がインペラ３の外周側（エアガイド４側）に排出されるため、２枚のシュラウド６、７の間の空間の中央部の下部側（後面シュラウド６側）に、空気の流れが遅い低速流域が生じる。これにより、ファン効率が悪化する恐れがあるという問題を有していた。 FIG. 16 is a side view showing the air flow of a conventional electric blower. In the conventional electric blower, as shown in FIG. 16, since the inflowing air is discharged to the outer peripheral side (air guide 4 side) of the impeller 3, the lower part of the central part of the space between the two shrouds 6 and 7. On the side (rear shroud 6 side), a low-speed basin with slow air flow is created. This has the problem that the fan efficiency may deteriorate.
国際公開第２０１７／１０４００９号International Publication No. 2017/104009
　本開示は、以上のような問題を解決するものである。本開示は、ファン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目的とする。 This disclosure solves the above problems. It is an object of the present disclosure to provide an electric fan capable of improving fan efficiency.
　本開示の第１の態様に係る電動送風機は、回転軸を有する電動機と、前記回転軸に固定され前記電動機によって回転駆動されるインペラと、前記インペラの外周部に設けられ、前記インペラから排出された空気が流入するエアガイドとを備え、前記インペラは、後面シュラウドと、前記後面シュラウドと間隔を置いて配した前面シュラウドと、前記前面シュラウドの上面中央部に設けた吸気口と、前記後面シュラウドと前記前面シュラウドの両方またはいずれか一方に取り付けられ周方向に等間隔に配置された複数の第１翼部で構成される遠心ファンと、前記遠心ファンの径方向の内側に位置する軸流ファンとを有し、前記遠心ファン、前記軸流ファンは周方向に回転し、前記軸流ファンは、前記回転軸の方向で上方に向いており、かつ前記回転軸に対して傾斜した複数の第２翼部が周方向に等間隔に配置されている。 The electric blower according to the first aspect of the present disclosure includes an electric motor having a rotating shaft, an impeller fixed to the rotating shaft and rotationally driven by the electric motor, and an impeller provided on the outer peripheral portion of the impeller and discharged from the impeller. The impeller is provided with an air guide through which air flows in, and the impeller has a rear shroud, a front shroud arranged at a distance from the rear shroud, an intake port provided in the center of the upper surface of the front shroud, and the rear shroud. A centrifugal fan composed of a plurality of first blades attached to both or one of the front shroud and arranged at equal intervals in the circumferential direction, and an axial flow fan located inside the centrifugal fan in the radial direction. The centrifugal fan and the axial flow fan rotate in the circumferential direction, and the axial flow fan faces upward in the direction of the rotation axis and is inclined with respect to the rotation axis. The two wings are arranged at equal intervals in the circumferential direction.
　本開示の第２の態様に係る電動送風機は、第１の態様において、前記複数の第１翼部の翼枚数と前記複数の第２翼部の翼枚数が同等である。 In the electric blower according to the second aspect of the present disclosure, in the first aspect, the number of blades of the plurality of first blades and the number of blades of the plurality of second blades are equivalent.
　本開示の第３の態様に係る電動送風機は、第１または第２の態様において、前記複数の第２翼部の回転方向後縁部と前記複数の第１翼部の回転方向前縁部とがなす角度が１５度から４０度の範囲内である。 In the first or second aspect, the electric blower according to the third aspect of the present disclosure includes the rotational trailing edge portion of the plurality of second wing portions and the rotational direction leading edge portion of the plurality of first wing portions. The angle formed by the wing is in the range of 15 to 40 degrees.
　本開示の第４の態様に係る電動送風機は、第１～第３の態様のいずれかにおいて、前記インペラの前記エアガイドとの対向部の軸方向上面と、前記後面シュラウドとの間の軸方向の寸法をｈ０、前記後面シュラウドと前記複数の第２翼部の回転方向後縁部までの間の軸方向での寸法をｔ１、前記後面シュラウドと前記対向部の軸方向中心部までの軸方向での寸法をｔ０、ｔ１－ｔ０をｈとしたとき、－２０％≦ｈ／ｈ０≦７０％である。 The electric blower according to the fourth aspect of the present disclosure has, in any one of the first to third aspects, the axial direction between the axial upper surface of the impeller facing the air guide and the rear shroud. The dimension of h0, the axial dimension between the rear surface shroud and the rotational trailing edges of the plurality of second blades is t1, and the axial direction between the rear surface shroud and the axial center of the facing portion. When t0 and t1-t0 are h, −20% ≦ h / h0 ≦ 70%.
　本開示によれば、ファン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が可能である。 According to the present disclosure, it is possible to provide an electric blower capable of improving fan efficiency.
本開示の実施の形態に係る電動送風機の側面図Side view of the electric blower according to the embodiment of the present disclosure. 同電動送風機の主要部の分解斜視図An exploded perspective view of the main part of the electric blower 同電動送風機のインペラの斜視図Perspective view of the impeller of the electric blower 同電動送風機のインペラの側面図Side view of the impeller of the electric blower 同電動送風機の複数の第１翼部の翼枚数が６枚のとき、複数の第２翼部の翼枚数と静圧特性との関係を示す図The figure which shows the relationship between the number of blades of a plurality of 2nd blades, and the static pressure characteristic when the number of blades of a plurality of 1st blades of the electric blower is 6. 同電動送風機の複数の第１翼部の翼枚数が６枚のとき、複数の第２翼部の翼枚数と効率特性との関係を示す図The figure which shows the relationship between the number of blades of a plurality of 2nd blades, and the efficiency characteristic when the number of blades of a plurality of 1st blades of the electric blower is 6. 同電動送風機の複数の第１翼部の翼枚数が６枚のとき、複数の第２翼部の翼枚数が６枚のときの相対速度ベクトル分布図Relative velocity vector distribution diagram when the number of blades of the plurality of first blades of the same electric blower is six, and when the number of blades of the plurality of second blades is six. 同電動送風機の複数の第１翼部の翼枚数が６枚のとき、複数の第２翼部の翼枚数が９枚のときの相対速度ベクトル分布図Relative velocity vector distribution diagram when the number of blades of the plurality of first blades of the same electric blower is six and the number of blades of the plurality of second blades is nine. 同電動送風機において、複数の第２翼部の回転方向後縁部と複数の第１翼部の回転方向前縁部とがなす角度を示す上面図Top view showing the angle between the trailing edge portion in the rotation direction of the plurality of second blade portions and the leading edge portion in the rotation direction of the plurality of first blade portions in the electric blower. 同電動送風機において、複数の第２翼部の回転方向後縁部、前縁部、複数の第１翼部の回転方向前縁部、後縁部を示す図The figure which shows the rotation direction trailing edge part, the leading edge part, and the rotation direction leading edge part, the trailing edge part of a plurality of first wing parts in the electric blower. 同電動送風機において、複数の第２翼部の回転方向後縁部と複数の第１翼部の回転方向前縁部とがなす回転位置と静圧特性との関係を示す図In the same electric blower, the figure which shows the relationship between the rotational position and static pressure characteristic which a plurality of rotation direction trailing edges of a 2nd wing part and the rotation direction leading edge part of a plurality of 1st wing parts form. 同電動送風機において、複数の第２翼部の回転方向後縁部と複数の第１翼部の回転方向前縁部とがなす回転位置と効率特性との関係を示す図The figure which shows the relationship between the rotation position and the efficiency characteristic formed by the rotation direction trailing edge part of a plurality of 2nd wing parts, and the rotation direction front edge part of a plurality of 1st wing parts in the electric blower. 同電動送風機において、複数の第２翼部の回転方向後縁部と複数の第１翼部の回転方向前縁部とがなす回転位置が４度の場合の空気の流速を示す図The figure which shows the flow velocity of the air in the same electric blower when the rotation position formed by the rotation direction trailing edge part of a plurality of 2nd wing parts and the rotation direction front edge part of a plurality of 1st wing parts is 4 degrees. 同電動送風機において、複数の第２翼部の回転方向後縁部と複数の第１翼部の回転方向前縁部とがなす回転位置が２７度のときの空気の流速の周方向成分の大きさ分布を示す図In the same electric blower, the magnitude of the circumferential component of the air flow velocity when the rotation position formed by the rotation direction trailing edges of the plurality of second blades and the rotation direction leading edges of the first blades is 27 degrees. Diagram showing the distribution 同電動送風機において、後面シュラウドとインペラのエアガイドとの対向部の軸方向上面Ｌ１と後面シュラウドとの間の軸方向の寸法ｈ０、後面シュラウドと複数の第２翼部の回転方向後縁部までの間の軸方向での寸法ｔ１、後面シュラウドとエアガイド対向部の軸方向中心部Ｌ０までの軸方向での寸法ｔ０、ｔ１からｔ０を引いた寸法ｈを示す図In the same electric blower, the axial dimension h0 between the axial upper surface L1 of the facing portion between the rear shroud and the air guide of the impeller and the rear shroud, to the rotational trailing edges of the rear shroud and the plurality of second blades. The figure which shows the dimension t1 in the axial direction between, the dimension t0 in the axial direction up to the axial center portion L0 of the rear shroud and the air guide facing portion, and the dimension h obtained by subtracting t0 from t1. 同電動送風機において、高さと静圧特性との関係を示す図The figure which shows the relationship between the height and the static pressure characteristic in the electric blower. 同電動送風機において、高さと効率特性との関係を示す図The figure which shows the relationship between the height and the efficiency characteristic in the electric blower. 従来の電動送風機の側面図Side view of a conventional electric blower 同電動送風機の主要部の斜視図Perspective view of the main part of the electric blower 同電動送風機のインペラを示す斜視図Perspective view showing the impeller of the electric blower 同電動送風機の空気の流れを示す側面図Side view showing the air flow of the electric blower
　以下、本開示の実施の形態について、図面を参照して説明する。なお、以下の実施の形態及び実施例によって本開示が限定されるものではない。 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments and examples.
　図１は、本開示の実施の形態に係る電動送風機の側面図である。図２は、同電動送風機の主要部の分解斜視図である。図３は、同電動送風機のインペラの斜視図である。 FIG. 1 is a side view of the electric blower according to the embodiment of the present disclosure. FIG. 2 is an exploded perspective view of the main part of the electric blower. FIG. 3 is a perspective view of the impeller of the electric blower.
　実施の形態に係る電動送風機１１は、回転軸ＲＣを有する電動機１２と、回転軸ＲＣに固定され電動機１２によって回転駆動されるインペラ１３と、インペラ１３の外周部に位置し、インペラ１３から排出された空気が流入するエアガイド１４と、インペラ１３とエアガイド１４を内包するファンケース１５とを備えている。 The electric blower 11 according to the embodiment is located on the outer peripheral portion of the motor 12, the impeller 13 fixed to the rotary shaft RC and rotationally driven by the motor 12, and is discharged from the impeller 13. It includes an air guide 14 into which the air flows in, and a fan case 15 including an impeller 13 and an air guide 14.
　インペラ１３は、後面シュラウド１６と、後面シュラウド１６と間隔を置いて配した前面シュラウド１７と、前面シュラウド１７の中央に設けた吸気口１８と、後面シュラウド１６と前面シュラウド１７の両方またはどちらか一方に取り付けられ周方向に等間隔に配置された複数の第１翼部１９とを有している。複数の第１翼部１９で遠心ファン２０が構成される。 The impeller 13 includes a rear shroud 16, a front shroud 17 spaced apart from the rear shroud 16, an intake port 18 provided in the center of the front shroud 17, and / or both of the rear shroud 16 and the front shroud 17. It has a plurality of first wing portions 19 attached to and arranged at equal intervals in the circumferential direction. The centrifugal fan 20 is composed of a plurality of first wing portions 19.
　複数の第１翼部１９の内側（遠心ファン２０の径方向の内側）に、後面シュラウド１６に取り付けられ、回転軸ＲＣ方向で上方に向いており、かつ回転軸ＲＣに対して傾斜した複数の第２翼部２１が周方向に等間隔に配置されている。複数の第２翼部２１で軸流ファン２２が構成される（図２では省略している。）。 A plurality of first wing portions 19 attached to the rear shroud 16 inside (the radial inside of the centrifugal fan 20), facing upward in the rotation axis RC direction, and inclined with respect to the rotation axis RC. The second wing portions 21 are arranged at equal intervals in the circumferential direction. The axial flow fan 22 is composed of a plurality of second wing portions 21 (omitted in FIG. 2).
　ここで、電動機１２よりインペラ１３側、すなわち、後面シュラウド１６から前面シュラウド１７に向かう方向、を軸方向で上方とし、インペラ１３の回転方向を周方向とし、周方向と直交し回転軸ＲＣに向かう方向を径方向と呼ぶことがある。 Here, the impeller 13 side from the electric motor 12, that is, the direction from the rear shroud 16 to the front shroud 17 is upward in the axial direction, the rotation direction of the impeller 13 is the circumferential direction, and the rotation direction is orthogonal to the circumferential direction toward the rotation axis RC. The direction is sometimes called the radial direction.
　電動機１２は、ローター部１２１とステータ部１２２、それらを覆うブラケット１２３とを少なくとも有しているモータである。ローター部１２１は、回転軸ＲＣ（シャフト１２４）に固定され、コイル部１２５が設けられている。ブラケット１２３は、円筒形状で構成され、その下方には排気口（図示せず）が開口している。そして、回転軸ＲＣにインペラ１３が回転自在に接続されている。 The motor 12 is a motor having at least a rotor portion 121, a stator portion 122, and a bracket 123 covering them. The rotor portion 121 is fixed to the rotating shaft RC (shaft 124), and the coil portion 125 is provided. The bracket 123 is formed in a cylindrical shape, and an exhaust port (not shown) is opened below the bracket 123. The impeller 13 is rotatably connected to the rotary shaft RC.
　ファンケース１５（図２では省略している。）は、円筒形状でブラケット１２３の上部に取り付けられている。ファンケース１５の内部には、インペラ１３と、インペラ１３に対向し、インペラ１３から排出された空気が流れ込む空間を形成するエアガイド１４とが収納されている。 The fan case 15 (omitted in FIG. 2) has a cylindrical shape and is attached to the upper part of the bracket 123. Inside the fan case 15, an impeller 13 and an air guide 14 facing the impeller 13 and forming a space through which the air discharged from the impeller 13 flows are housed.
　インペラ１３は、後面シュラウド１６と、後面シュラウド１６と間隔を置いて配した前面シュラウド１７と、前面シュラウド１７の中央に設けた吸気口１８と、後面シュラウド１６と前面シュラウド１７の両方またはどちらか一方に取り付けられた複数の第１翼部１９（遠心ファン２０）と複数の第２翼部２１（軸流ファン２２）とを備える。 The impeller 13 includes a rear shroud 16, a front shroud 17 spaced apart from the rear shroud 16, an intake port 18 provided in the center of the front shroud 17, and / or both of the rear shroud 16 and the front shroud 17. A plurality of first wing portions 19 (centrifugal fan 20) and a plurality of second wing portions 21 (axial flow fan 22) attached to the above are provided.
　後面シュラウド１６は円板形状である。前面シュラウド１７は、断面が湾曲したリング形状となっている。前面シュラウド１７の前記後面シュラウドと対向しない面（上面）の径方向中央部に吸気口１８が設けられている。後面シュラウド１６と前面シュラウド１７は同軸上に配置されている。後面シュラウド１６と前面シュラウド１７は、例えば樹脂製または板金製である。後面シュラウド１６と前面シュラウド１７は、一定の間隔を置いて配置されている。なお、上面は軸方向でより上方にある面を言い、以下の説明でも同様である。 The rear shroud 16 has a disk shape. The front shroud 17 has a ring shape with a curved cross section. An intake port 18 is provided at the radial center portion of the surface (upper surface) of the front shroud 17 that does not face the rear shroud. The rear shroud 16 and the front shroud 17 are arranged coaxially. The rear shroud 16 and the front shroud 17 are made of, for example, resin or sheet metal. The rear shroud 16 and the front shroud 17 are arranged at regular intervals. The upper surface refers to a surface that is higher in the axial direction, and the same applies to the following description.
　複数の第１翼部１９（遠心ファン２０）は、後面シュラウド１６または前面シュラウド１７と一体に成型された、例えば樹脂製または板金製である。複数の第１翼部１９は、回転軸ＲＣを中心として放射状に延びて形成されている。複数の第１翼部１９は、後面シュラウド１６から回転軸ＲＣ方向に起立するように形成されている。さらに、例えば回転方向（図面では反時計回り）に対して後面シュラウド１６の外周に向かうほど後進側に傾斜する後傾翼形状となっている。 The plurality of first wing portions 19 (centrifugal fans 20) are integrally molded with the rear shroud 16 or the front shroud 17, for example, made of resin or sheet metal. The plurality of first wing portions 19 are formed so as to extend radially around the rotation axis RC. The plurality of first wing portions 19 are formed so as to stand up from the rear shroud 16 in the direction of the rotation axis RC. Further, for example, the rear tilting blade shape is inclined toward the reverse side toward the outer periphery of the rear surface shroud 16 in the rotation direction (counterclockwise in the drawing).
　複数の第１翼部１９の翼は、周方向に等間隔に設けられている。複数の第１翼部１９の枚数は例えば６枚である。 The plurality of wings of the first wing portion 19 are provided at equal intervals in the circumferential direction. The number of the plurality of first wing portions 19 is, for example, six.
　複数の第２翼部２１（軸流ファン２２）は、後面シュラウド１６の上面の径方向中央部に取り付けられている。複数の第２翼部２１は、例えば樹脂製または板金製である。複数の第２翼部２１は、複数の第１翼部１９（遠心ファン２０）の径方向の内側に配置されている。 A plurality of second wing portions 21 (axial flow fans 22) are attached to the radial center portion of the upper surface of the rear shroud 16. The plurality of second wing portions 21 are made of, for example, resin or sheet metal. The plurality of second wing portions 21 are arranged inside the plurality of first wing portions 19 (centrifugal fan 20) in the radial direction.
　複数の第２翼部２１は、回転軸ＲＣ方向で上方に向いており、かつ、回転方向に対しての前縁が後縁より上方に位置するように回転軸ＲＣに対して傾斜している。 The plurality of second wing portions 21 are oriented upward in the rotation axis RC direction, and are inclined with respect to the rotation axis RC so that the leading edge in the rotation direction is located above the trailing edge. ..
　複数の第２翼部２１の翼は、周方向に等間隔に設けられている。複数の第２翼部２１の枚数は例えば６枚である。 The blades of the plurality of second wing portions 21 are provided at equal intervals in the circumferential direction. The number of the plurality of second wing portions 21 is, for example, six.
　遠心ファン２０と軸流ファン２２とは別体であり、両方とも回転軸ＲＣに固定される。このため、同期回転する。軸流ファン２２を板金によって形成すれば、製作が容易である。 The centrifugal fan 20 and the axial fan 22 are separate bodies, and both are fixed to the rotating shaft RC. Therefore, it rotates synchronously. If the axial flow fan 22 is formed of sheet metal, it is easy to manufacture.
　遠心ファン２０、軸流ファン２２は、後面シュラウド１６と一体的に形成してもよいし、別々に形成した後、後面シュラウド１６に取り付けるようにしてもよい。 The centrifugal fan 20 and the axial flow fan 22 may be integrally formed with the rear shroud 16, or may be formed separately and then attached to the rear shroud 16.
　上記実施の形態における電動送風機１１では、電動機１２によってインペラ１３が回転すると、空気を吸気口１８側からファンケース１５内に流入させる。吸気口１８の径方向外側からファンケース１５内に流入した空気は複数の第１翼部１９の翼部間に流入する。後面シュラウド１６、前面シュラウド１７の間で第１翼部１９の各翼部間に押し出された空気は、インペラ１３の回転により全圧が高められ、インペラ１３の外周部に形成されたエアガイド１４に流入する。 In the electric blower 11 in the above embodiment, when the impeller 13 is rotated by the electric motor 12, air is made to flow into the fan case 15 from the intake port 18 side. The air that has flowed into the fan case 15 from the radial outside of the intake port 18 flows between the blade portions of the plurality of first blade portions 19. The total pressure of the air extruded between each wing portion of the first wing portion 19 between the rear surface shroud 16 and the front shroud 17 is increased by the rotation of the impeller 13, and the air guide 14 formed on the outer peripheral portion of the impeller 13 is formed. Inflow to.
　さらに、吸気口１８の径方向中央側からファンケース１５内に流入した空気は複数の第２翼部２１の翼部間に流入する。第２翼部２１の各翼部間に押し出された空気は、インペラ１３の回転により全圧が高められ、複数の第１翼部１９の翼部間を介してエアガイド１４に流入する。 Further, the air that has flowed into the fan case 15 from the radial center side of the intake port 18 flows between the blade portions of the plurality of second blade portions 21. The total pressure of the air extruded between the wing portions of the second wing portion 21 is increased by the rotation of the impeller 13, and flows into the air guide 14 through the wing portions of the plurality of first wing portions 19.
　エアガイド１４で整流された空気は、電動機１２のブラケット１２３内へ送り込まれる。ブラケット１２３内を通過した空気は、排気口（図示せず）からブラケット１２３の外部へ流出する。 The air rectified by the air guide 14 is sent into the bracket 123 of the motor 12. The air that has passed through the bracket 123 flows out of the bracket 123 from the exhaust port (not shown).
　電動送風機１１は、後面シュラウド１６、前面シュラウド１７の間の空間の径方向中央部に軸流ファン２２を設けている。このため、吸気口１８の径方向中央側からファンケース１５内に流入した空気に対しても、流れが遅い低速流域を生じさせることなく、図４に示すように、高速で遠心ファン２０の複数の第１翼部１９の翼部間に流出させることができる。図４は、本開示の実施の形態に係る電動送風機のインペラの側面図である。よって、遠心ファン２０によって外周側（エアガイド１４）へ空気を排出できる。これにより、ファン効率を向上させることができるという効果を期待できる。 The electric blower 11 is provided with an axial flow fan 22 at the radial center of the space between the rear shroud 16 and the front shroud 17. Therefore, as shown in FIG. 4, a plurality of centrifugal fans 20 are used at high speed without causing a low-speed basin in which the flow is slow even for the air flowing into the fan case 15 from the radial center side of the intake port 18. It can be drained between the wing portions of the first wing portion 19 of the above. FIG. 4 is a side view of the impeller of the electric blower according to the embodiment of the present disclosure. Therefore, air can be discharged to the outer peripheral side (air guide 14) by the centrifugal fan 20. This can be expected to have the effect of improving fan efficiency.
　本開示の実施の形態においては、複数の第１翼部１９の翼枚数と複数の第２翼部２１の翼枚数が６枚で同等としている。 In the embodiment of the present disclosure, the number of blades of the plurality of first wing portions 19 and the number of blades of the plurality of second wing portions 21 are 6 and are equivalent.
　図５Ａは、本開示の実施の形態に係る電動送風機の複数の第１翼部１９の翼枚数が６枚のとき、複数の第２翼部２１の翼枚数と静圧特性との関係を示す図である。図５Ｂは、同電動送風機の複数の第１翼部１９の翼枚数が６枚のとき、複数の第２翼部２１の翼枚数と効率特性との関係を示す図である。 FIG. 5A shows the relationship between the number of blades of the plurality of second blade portions 21 and the static pressure characteristic when the number of blades of the plurality of first blade portions 19 of the electric blower according to the embodiment of the present disclosure is six. It is a figure. FIG. 5B is a diagram showing the relationship between the number of blades of the plurality of second blade portions 21 and the efficiency characteristics when the number of blades of the plurality of first blade portions 19 of the electric blower is six.
　図５Ａと図５Ｂから明らかなように、複数の第２翼部２１の翼枚数が６枚、すなわち複数の第１翼部１９の翼枚数と同じ枚数のときが、最も静圧特性、効率特性が良好で、損失が小さくファン効率が良いことが分かる。 As is clear from FIGS. 5A and 5B, when the number of blades of the plurality of second blade portions 21 is 6, that is, the number of blades is the same as the number of blades of the plurality of first blade portions 19, the static pressure characteristic and the efficiency characteristic are the most. It can be seen that the fan efficiency is good, the loss is small, and the fan efficiency is good.
　図６Ａは、本開示の実施の形態に係る電動送風機の複数の第１翼部１９の翼枚数が６枚のとき、複数の第２翼部２１の翼枚数が６枚のときの相対速度ベクトル分布（回転軸ＲＣに垂直な断面）図である。図６Ｂは、同電動送風機の複数の第１翼部１９の翼枚数が６枚のとき、複数の第２翼部２１の翼枚数が９枚のときの相対速度ベクトル分布図である。 FIG. 6A shows a relative velocity vector when the number of blades of the plurality of first blade portions 19 of the electric blower according to the embodiment of the present disclosure is six, and when the number of blades of the plurality of second blade portions 21 is six. It is a distribution (cross section perpendicular to the rotation axis RC) diagram. FIG. 6B is a relative velocity vector distribution diagram when the number of blades of the plurality of first blade portions 19 of the electric blower is six and the number of blades of the plurality of second blade portions 21 is nine.
　複数の第２翼部２１の翼枚数が９枚のときは、図６Ｂに示すように、複数の第１翼部１９への空気の流入が翼毎に異なるため、第１翼部１９の翼のうち損失が大きくなる翼が存在する（矢印で示した箇所）ことになる。 When the number of blades of the plurality of second blade portions 21 is 9, as shown in FIG. 6B, the inflow of air into the plurality of first blade portions 19 is different for each blade, so that the blade of the first blade portion 19 is used. Of these, there are wings with large losses (points indicated by arrows).
　図７は、本開示の実施の形態に係る電動送風機において、複数の第２翼部２１の回転方向後縁部２１ａと、複数の第１翼部１９の回転方向前縁部１９ａとがなす角度を示す上面図である。角度θは、１５度から４０度の範囲内となっている。 FIG. 7 shows an angle formed by the rotation direction trailing edge portion 21a of the plurality of second wing portions 21 and the rotation direction leading edge portion 19a of the plurality of first wing portions 19 in the electric blower according to the embodiment of the present disclosure. It is a top view which shows. The angle θ is in the range of 15 to 40 degrees.
　図８は、本開示の実施の形態に係る電動送風機において、複数の第２翼部２１の回転方向後縁部、前縁部、複数の第１翼部１９の回転方向前縁部、後縁部を示す図である。図８に示すように、第１翼部１９の回転方向前縁部１９ａは、第１翼部１９のうち回転方向で最も前側の箇所を指す。第２翼部２１の回転方向後縁部２１ａは、第２翼部２１のうち回転方向で最も後側の箇所を指す。第１翼部１９の回転方向後縁部１９ｂは、第１翼部１９のうち回転方向で最も後側の箇所を指す。第２翼部２１の回転方向前縁部２１ｂは、第２翼部２１のうち回転方向で最も前側の箇所を指す。第２翼部２１の回転方向後縁部２１ａは、第２翼部２１の回転方向前縁部２１ｂよりも軸方向で下方に位置する。 FIG. 8 shows, in the electric blower according to the embodiment of the present disclosure, the rotation direction trailing edge portion and the leading edge portion of the plurality of second wing portions 21, and the rotation direction leading edge portion and the trailing edge portion of the plurality of first wing portions 19. It is a figure which shows the part. As shown in FIG. 8, the rotation direction leading edge portion 19a of the first wing portion 19 refers to the frontmost portion in the rotation direction of the first wing portion 19. The trailing edge portion 21a in the rotation direction of the second wing portion 21 refers to the rearmost portion of the second wing portion 21 in the rotation direction. The trailing edge portion 19b in the rotation direction of the first wing portion 19 refers to the rearmost portion of the first wing portion 19 in the rotation direction. The leading edge portion 21b in the rotation direction of the second wing portion 21 refers to the frontmost portion in the rotation direction of the second wing portion 21. The trailing edge portion 21a in the rotation direction of the second wing portion 21 is located below the leading edge portion 21b in the rotation direction of the second wing portion 21 in the axial direction.
　図９Ａは、本開示の実施の形態に係る電動送風機において、複数の第２翼部２１の回転方向後縁部２１ａと複数の第１翼部１９の回転方向前縁部１９ａとがなす角度θと静圧特性との関係を示す図である。図９Ｂは、同電動送風機において、複数の第２翼部２１の回転方向後縁部２１ａと複数の第１翼部１９の回転方向前縁部１９ａとがなす回転位置と効率特性との関係を示す図である。 FIG. 9A shows an angle θ formed by the rotational trailing edge 21a of the plurality of second wing portions 21 and the rotational leading edge 19a of the first wing 19 in the electric blower according to the embodiment of the present disclosure. It is a figure which shows the relationship between static pressure characteristic and static pressure characteristic. FIG. 9B shows the relationship between the rotational position and the efficiency characteristic formed by the rotational trailing edge 21a of the plurality of second wing portions 21 and the rotational leading edge 19a of the first wing 19 in the electric blower. It is a figure which shows.
　図９Ａと図９Ｂとから明らかなように、角度θが１５度から４０度の範囲内の場合、静圧または効率の改善率が１％以上となり（静圧差１５０Ｐａが１％改善に相当）、損失が小さくファン効率が良いことが分かる。 As is clear from FIGS. 9A and 9B, when the angle θ is in the range of 15 to 40 degrees, the improvement rate of static pressure or efficiency is 1% or more (static pressure difference of 150 Pa corresponds to 1% improvement). It can be seen that the loss is small and the fan efficiency is good.
　すなわち、軸流ファン２２の主流（速度の速い流れ）が遠心ファン２０に低損失となる位置で流入するような、軸流ファン２２と遠心ファン２０とが最適な相対位置としている。 That is, the axial flow fan 22 and the centrifugal fan 20 are set to the optimum relative positions so that the main flow (high speed flow) of the axial flow fan 22 flows into the centrifugal fan 20 at a position where the loss is low.
　図１０Ａは、本開示の実施の形態に係る電動送風機において、複数の第２翼部２１の回転方向後縁部２１ａと複数の第１翼部１９の回転方向前縁部１９ａとがなす角度θが４度のときの空気の流速の周方向成分の大きさ分布（回転軸ＲＣに垂直な断面）を示す図である。図１０Ｂは、同電動送風機において、複数の第２翼部２１の回転方向後縁部２１ａと複数の第１翼部１９の回転方向前縁部１９ａとがなす角度θが２７度のときの空気の流速の周方向成分の大きさ分布を示す図である。角度θが２７度の方が流速の周方向成分が大きく、出力が大きい。 FIG. 10A shows an angle θ formed by the rotational trailing edge 21a of the plurality of second wing portions 21 and the rotational leading edge 19a of the first wing 19 in the electric blower according to the embodiment of the present disclosure. It is a figure which shows the magnitude distribution (cross section perpendicular to the rotation axis RC) of the circumferential component of the air flow velocity when is 4 degrees. FIG. 10B shows the air when the angle θ formed by the rotational trailing edge 21a of the plurality of second wing portions 21 and the rotational leading edge 19a of the first wing 19 in the electric blower is 27 degrees. It is a figure which shows the size distribution of the circumferential component of the flow velocity of. When the angle θ is 27 degrees, the circumferential component of the flow velocity is larger and the output is larger.
　なお、第１翼部１９と第２翼部２１は同期して回転するため、この角度θは変動しない。 Since the first wing portion 19 and the second wing portion 21 rotate in synchronization with each other, this angle θ does not change.
　図１１は、本開示の実施の形態に係る電動送風機において、インペラ１３のエアガイド１４との対向部（エアガイド対向部）１４ａ（インペラ１３の径方向外側に位置し、遠心ファン２０の出口部分）の軸方向上面Ｌ１と後面シュラウド１６との間の軸方向の寸法ｈ０、後面シュラウド１６と複数の第２翼部２１の回転方向後縁部２１ａまでの間の軸方向での寸法ｔ１、後面シュラウド１６とエアガイド対向部１４ａの軸方向中心部Ｌ０までの軸方向での寸法ｔ０、ｔ１からｔ０を引いた寸法ｈを示す図である。このとき、－２０％≦ｈ／ｈ０≦７０％としている。 FIG. 11 shows, in the electric blower according to the embodiment of the present disclosure, a portion facing the air guide 14 of the impeller 13 (air guide facing portion) 14a (located radially outside the impeller 13 and an outlet portion of the centrifugal fan 20). ) Axial dimension h0 between the axial upper surface L1 and the rear surface shroud 16, axial dimension t1 between the rear surface shroud 16 and the rotational trailing edge 21a of the plurality of second wing portions 21, and the rear surface. It is a figure which shows the dimension h which subtracted t0 from the dimension t0 and t1 in the axial direction up to the axial center portion L0 of the shroud 16 and the air guide facing portion 14a. At this time, −20% ≦ h / h0 ≦ 70%.
　図１２Ａは、本開示の実施の形態に係る電動送風機において、高さ（％）と静圧特性との関係を示す図である。図１２Ｂは、同電動送風機において、高さ（％）と効率特性との関係を示す図である。 FIG. 12A is a diagram showing the relationship between the height (%) and the static pressure characteristic in the electric blower according to the embodiment of the present disclosure. FIG. 12B is a diagram showing the relationship between the height (%) and the efficiency characteristics in the electric blower.
　図１２から明らかなように、－２０％≦ｈ／ｈ０≦７０％の場合、静圧または効率の改善率が１％以上となり（静圧差１５０Ｐａが１％改善に相当）、損失が小さくファン効率が良いことが分かる。 As is clear from FIG. 12, when -20% ≤ h / h0 ≤ 70%, the improvement rate of static pressure or efficiency is 1% or more (static pressure difference of 150 Pa corresponds to 1% improvement), the loss is small, and the fan efficiency is small. Turns out to be good.
　すなわち、軸流ファン２２の後縁部２１ａが遠心ファン２０の出口高さ（エアガイド１４との対向部１４ａ）中心部Ｌ０と相対する位置に配置すればよい。翼部は後縁での仕事量が大きいことから、軸流ファン２２の後縁部２１ａを遠心ファン２０の後縁部１９ｂの軸方向高さ中心に相対する位置に配置し、軸流ファン２２の後縁部２１ａの下部の仕事量の低下を防止する。 That is, the trailing edge portion 21a of the axial flow fan 22 may be arranged at a position facing the center portion L0 of the outlet height of the centrifugal fan 20 (the portion facing the air guide 14 14a). Since the wing portion has a large amount of work at the trailing edge, the trailing edge portion 21a of the axial flow fan 22 is arranged at a position facing the axial height center of the trailing edge portion 19b of the centrifugal fan 20, and the axial flow fan 22 is arranged. Prevents a decrease in the work load at the lower portion of the trailing edge portion 21a.
　以上のように、本開示の実施の形態に係る電動送風機１１は、回転軸ＲＣを有する電動機１２と、回転軸ＲＣに固定され電動機１２によって回転駆動されるインペラ１３と、インペラ１３の外周部に設けられ、インペラ１３から排出された空気が流入するエアガイド１４とを備え、インペラ１３は、後面シュラウド１６と、後面シュラウド１６と間隔を置いて配した前面シュラウド１７と、前面シュラウド１７の上面中央部に設けた吸気口１８と、後面シュラウド１６と前面シュラウド１７の両方またはどちらか一方に取り付けられ周方向に等間隔に配置された複数の第１翼部１９で構成される遠心ファン２０と、遠心ファン２０の径方向の内側に位置する軸流ファン２２とを有し、遠心ファン２０と軸流ファン２２は周方向に回転し、軸流ファン２２は、回転軸ＲＣの方向で上方に向いており、かつ回転軸ＲＣに対して傾斜した複数の第２翼部２１が周方向に等間隔に配置されている。 As described above, the electric blower 11 according to the embodiment of the present disclosure includes an electric motor 12 having a rotary shaft RC, an impeller 13 fixed to the rotary shaft RC and rotationally driven by the motor 12, and an outer peripheral portion of the impeller 13. The impeller 13 is provided with an air guide 14 from which the air discharged from the impeller 13 flows in, and the impeller 13 includes a rear shroud 16, a front shroud 17 arranged at a distance from the rear shroud 16, and the center of the upper surface of the front shroud 17. An intake port 18 provided in the portion, a centrifugal fan 20 composed of a plurality of first wing portions 19 attached to both or one of the rear shroud 16 and the front shroud 17 and arranged at equal intervals in the circumferential direction, and a centrifugal fan 20. It has an axial flow fan 22 located inside the centrifugal fan 20 in the radial direction, the centrifugal fan 20 and the axial flow fan 22 rotate in the circumferential direction, and the axial flow fan 22 faces upward in the direction of the rotating shaft RC. A plurality of second wing portions 21 which are inclined with respect to the rotation axis RC are arranged at equal intervals in the circumferential direction.
　これにより、ファン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が可能である。 This makes it possible to provide an electric fan that can improve fan efficiency.
　また、複数の第１翼部１９の翼枚数と複数の第２翼部２１の翼枚数が同等であると好ましい。 Further, it is preferable that the number of blades of the plurality of first blade portions 19 and the number of blades of the plurality of second blade portions 21 are the same.
　また、複数の第２翼部２１の回転方向後縁部２１ａと複数の第１翼部１９の回転方向前縁部１９ａとがなす角度が１５度から４０度の範囲内であることが好ましい。 Further, it is preferable that the angle formed by the trailing edge portion 21a in the rotation direction of the plurality of second wing portions 21 and the leading edge portion 19a in the rotation direction of the plurality of first wing portions 19 is within the range of 15 degrees to 40 degrees.
　また、インペラ１３のエアガイド１４との対向部（エアガイド対向部）の軸方向上面と後面シュラウド１６との間の軸方向の寸法をｈ０、後面シュラウド１６と複数の第２翼部２１の回転方向後縁部２１ａまでの間の軸方向での寸法をｔ１、後面シュラウド１６と前記エアガイド対向部の軸方向中心部までの軸方向での寸法をｔ０、ｔ１－ｔ０をｈとしたとき、－２０％≦ｈ／ｈ０≦７０％であることが好ましい。 Further, the axial dimension between the axial upper surface of the impeller 13 facing the air guide 14 (air guide facing portion) and the rear surface shroud 16 is h0, and the rotation of the rear surface shroud 16 and the plurality of second wing portions 21. When the axial dimension between the directional trailing edge 21a is t1, the axial dimension between the rear shroud 16 and the axial center of the air guide facing portion is t0, and t1-t0 is h. It is preferably −20% ≦ h / h0 ≦ 70%.
　なお、上記の実施の形態は一例に過ぎず、本発明はこれに限定されず、適宜変更することができる。 Note that the above embodiment is only an example, and the present invention is not limited to this and can be appropriately modified.
　本開示に係る電動送風機は、家庭用電気機器をはじめとして種々の機器に用いられている電動送風機等に広く利用可能である。 The electric blower according to the present disclosure can be widely used for electric blowers and the like used in various devices including household electric devices.
　１１　電動送風機
　１２　電動機
　１３　インペラ
　１４　エアガイド
　１５　ファンケース
　１６　後面シュラウド
　１７　前面シュラウド
　１８　吸気口
　１９　第１翼部
　２０　遠心ファン
　２１　第２翼部
　２２　軸流ファン
　１２１　ローター部
　１２２　ステータ部
　１２３　ブラケット
　１２４　シャフト
　１２５　コイル部 11 Electric blower 12 Motor 13 Impeller 14 Air guide 15 Fan case 16 Rear shroud 17 Front shroud 18 Intake port 19 1st wing 20 Centrifugal fan 21 2nd wing 22 Axial flow fan 121 Rotor 122 Stator 123 Bracket 124 Shaft 125 Coil part

Claims (4)

  1. 回転軸を有する電動機と、
    前記回転軸に固定され前記電動機によって回転駆動されるインペラと、
    前記インペラの外周部に設けられ、前記インペラから排出された空気が流入するエアガイドとを備え、
    前記インペラは、
    　　後面シュラウドと、
    　　前記後面シュラウドと間隔を置いて配した前面シュラウドと、
    　　前記前面シュラウドの前記後面シュラウドと対向しない上面中央部に設けた吸気口と、
    　　前記後面シュラウドと前記前面シュラウドの両方またはどちらか一方に取り付けられ周方向に等間隔に配置された複数の第１翼部で構成される遠心ファンと、
    　　前記遠心ファンの径方向の内側に位置する軸流ファンとを有し、
    前記遠心ファンと前記軸流ファンは周方向に回転し、
    前記軸流ファンは、前記回転軸の方向で前記後面シュラウドから前記前面シュラウドに向かう上方に向いており、かつ前記回転軸に対して傾斜した複数の第２翼部が周方向に等間隔に配置されている電動送風機。     An electric motor with a rotating shaft and
    An impeller fixed to the rotating shaft and driven to rotate by the motor,
    An air guide provided on the outer peripheral portion of the impeller and into which the air discharged from the impeller flows is provided.
    The impeller is
    With the rear shroud,
    The front shroud, which is spaced apart from the rear shroud,
    An intake port provided in the center of the upper surface of the front shroud that does not face the rear shroud,
    A centrifugal fan composed of a plurality of first blades attached to the rear shroud and / or one of the front shroud and arranged at equal intervals in the circumferential direction.
    It has an axial fan located inside the centrifugal fan in the radial direction.
    The centrifugal fan and the axial flow fan rotate in the circumferential direction, and the centrifugal fan and the axial flow fan rotate in the circumferential direction.
    The axial flow fan faces upward from the rear surface shroud toward the front shroud in the direction of the rotation axis, and a plurality of second blade portions inclined with respect to the rotation axis are arranged at equal intervals in the circumferential direction. The electric blower that has been.
  2. 前記複数の第１翼部の翼枚数と前記複数の第２翼部の翼枚数が同等である請求項１に記載の電動送風機。 The electric blower according to claim 1, wherein the number of blades of the plurality of first blade portions is equal to the number of blades of the plurality of second blade portions.
  3. 前記複数の第２翼部の回転方向後縁部と前記複数の第１翼部の回転方向前縁部とがなす角度が１５度から４０度の範囲内である請求項１または２に記載の電動送風機。 The invention according to claim 1 or 2, wherein the angle formed by the rotational trailing edge portion of the plurality of second wing portions and the rotational leading edge portion of the plurality of first wing portions is in the range of 15 degrees to 40 degrees. Electric blower.
  4. 前記インペラの前記エアガイドとの対向部の前記後面シュラウドと対向する軸方向上面と、前記後面シュラウドとの間の軸方向の寸法をｈ０、前記後面シュラウドと前記複数の第２翼部の回転方向後縁部までの間の軸方向での寸法をｔ１、前記後面シュラウドと前記対向部の軸方向中心部までの軸方向での寸法をｔ０、ｔ１－ｔ０をｈとしたとき、－２０％≦ｈ／ｈ０≦７０％である請求項１～３のいずれか１項に記載の電動送風機。 The axial dimension between the axial upper surface of the impeller facing the air guide and the rear surface shroud facing the rear surface shroud is h0, and the rotational direction of the rear surface shroud and the plurality of second wing portions. -20% ≦ when the axial dimension to the trailing edge is t1, the axial dimension to the axial center of the rear surface shroud and the facing portion is t0, and t1-t0 is h. The electric blower according to any one of claims 1 to 3, wherein h / h0 ≦ 70%.
PCT/JP2021/016756 2020-05-19 2021-04-27 Electric blower WO2021235197A1 (en)

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JP2020-087068 2020-05-19
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5127108A (en) * 1974-05-20 1976-03-06 Hitachi Ltd DENDOSO FUKI
JPS6013996A (en) * 1983-07-04 1985-01-24 Matsushita Electric Ind Co Ltd Fan
CN101566168A (en) * 2004-06-24 2009-10-28 建准电机工业股份有限公司 Blast-type cooling fan capable of increasing air input
JP2013029033A (en) * 2011-07-27 2013-02-07 Panasonic Corp Electric blower

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5127108A (en) * 1974-05-20 1976-03-06 Hitachi Ltd DENDOSO FUKI
JPS6013996A (en) * 1983-07-04 1985-01-24 Matsushita Electric Ind Co Ltd Fan
CN101566168A (en) * 2004-06-24 2009-10-28 建准电机工业股份有限公司 Blast-type cooling fan capable of increasing air input
JP2013029033A (en) * 2011-07-27 2013-02-07 Panasonic Corp Electric blower

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