WO2021235197A1 - Soufflante électrique - Google Patents

Soufflante électrique 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
Prior art date
Application number
PCT/JP2021/016756
Other languages
English (en)
Japanese (ja)
Inventor
静 横手
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2021235197A1 publication Critical patent/WO2021235197A1/fr

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Classifications

    • 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

L'invention concerne une soufflante électrique (11) comprenant un moteur électrique (12) comprenant un arbre rotatif, une roue à aubes (13) qui est fixée à l'arbre rotatif et qui est entraînée en rotation par le moteur électrique, et un guide d'air (14) dans lequel l'air évacué à partir de la roue à aubes s'écoule, la roue à aubes comprenant une enveloppe de surface arrière (16), une enveloppe de surface avant (17) disposée à distance de l'enveloppe de surface arrière, un orifice d'admission (18) disposé dans une partie centrale d'une surface supérieure de l'enveloppe de surface avant, un ventilateur centrifuge (20) consistant en une pluralité de premières parties de lame (19) qui sont fixées à l'enveloppe de surface arrière et qui sont disposées à des intervalles égaux dans la direction circonférentielle et un ventilateur à flux axial (22) positionné vers l'intérieur du ventilateur centrifuge dans la direction radiale ; le ventilateur centrifuge et le ventilateur à flux axial tournent dans la direction circonférentielle ; et le ventilateur à flux axial est tourné vers le haut dans la direction de l'arbre rotatif et comprend une pluralité de secondes parties de lame (ventilateur à flux axial) (21) qui sont inclinées par rapport à l'arbre rotatif et qui sont disposées à des intervalles égaux dans la direction circonférentielle.
PCT/JP2021/016756 2020-05-19 2021-04-27 Soufflante électrique WO2021235197A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-087068 2020-05-19
JP2020087068 2020-05-19

Publications (1)

Publication Number Publication Date
WO2021235197A1 true WO2021235197A1 (fr) 2021-11-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/016756 WO2021235197A1 (fr) 2020-05-19 2021-04-27 Soufflante électrique

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WO (1) WO2021235197A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5127108A (ja) * 1974-05-20 1976-03-06 Hitachi Ltd Dendosofuki
JPS6013996A (ja) * 1983-07-04 1985-01-24 Matsushita Electric Ind Co Ltd 送風機
CN101566168A (zh) * 2004-06-24 2009-10-28 建准电机工业股份有限公司 可增加进气量的鼓风式散热扇
JP2013029033A (ja) * 2011-07-27 2013-02-07 Panasonic Corp 電動送風機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5127108A (ja) * 1974-05-20 1976-03-06 Hitachi Ltd Dendosofuki
JPS6013996A (ja) * 1983-07-04 1985-01-24 Matsushita Electric Ind Co Ltd 送風機
CN101566168A (zh) * 2004-06-24 2009-10-28 建准电机工业股份有限公司 可增加进气量的鼓风式散热扇
JP2013029033A (ja) * 2011-07-27 2013-02-07 Panasonic Corp 電動送風機

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