WO2023286293A1 - Ventilateur électrique et aspirateur électrique équipé de celui-ci - Google Patents

Ventilateur électrique et aspirateur électrique équipé de celui-ci Download PDF

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Publication number
WO2023286293A1
WO2023286293A1 PCT/JP2022/000839 JP2022000839W WO2023286293A1 WO 2023286293 A1 WO2023286293 A1 WO 2023286293A1 JP 2022000839 W JP2022000839 W JP 2022000839W WO 2023286293 A1 WO2023286293 A1 WO 2023286293A1
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WO
WIPO (PCT)
Prior art keywords
downstream
housing
upstream
motor
electric blower
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PCT/JP2022/000839
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English (en)
Japanese (ja)
Inventor
武史 本多
誠二 坂上
啓祐 竹内
賢宏 伊藤
将太 山上
孔陽 川本
聡 菊地
真一 湧井
Original Assignee
日立グローバルライフソリューションズ株式会社
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Application filed by 日立グローバルライフソリューションズ株式会社 filed Critical 日立グローバルライフソリューションズ株式会社
Priority to CN202280047234.4A priority Critical patent/CN117597522A/zh
Publication of WO2023286293A1 publication Critical patent/WO2023286293A1/fr

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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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer

Definitions

  • the present invention relates to an electric blower and a vacuum cleaner equipped with it.
  • Patent Document 1 describes "an impeller having an impeller 10 rotating around a vertically extending central axis C and a stator 24 disposed below the impeller. , a motor housing 21 that houses the stator, and a fan casing 2 that houses the impeller and the motor housing and forms the first flow path 5 in the gap between the motor housing and the upper part of the fan casing. covers the top of the impeller and has an intake port 3 that opens vertically, and an exhaust port 4 that communicates with the intake port via a first flow path is provided in the lower part of the fan casing.
  • an inlet 21a penetrating in the radial direction and communicating with the first flow path is provided, and the motor housing extends upward from the inlet and is above the stator.
  • a blower device having a second flow path 6 communicating with the space of .
  • vacuum cleaners driven by batteries such as cordless stick vacuum cleaners and autonomous driving vacuum cleaners (robot vacuum cleaners) consume less power due to the battery capacity, and the maximum air flow is also low. small. Therefore, when the filter is clogged, there is a problem that the dust carrying capacity is lowered and the suction power of the vacuum cleaner is lowered.
  • battery-powered vacuum cleaners are required to be compact and lightweight, and electric blowers mounted on vacuum cleaners are required to have both a strong suction force over a wide air volume range and a small size.
  • part of the airflow S flowing through the outer first flow path 5 flows into the inlet 21a provided in the peripheral wall of the motor housing 21. , flows into the inner second flow path 6, cools the upper bearing 26, further cools the lower bearing 26, and flows into the second flow path 6 without joining the first flow path 5.
  • the air is exhausted to the outside of the blower 1 from the outlet (outflow port 29a).
  • part of the airflow S flowing through the first flow path 5 is In the first flow path 5, the air volume downstream of the inflow port 21a (branch point) is smaller than the air volume upstream of the inflow port 21a (branch point) due to the pressure loss (resistance) at the time of branching. rice field.
  • the present invention is intended to solve the above problems, and is an electric blower that is compact and lightweight, has high efficiency in a wide air volume range, and has high motor cooling efficiency, and a vacuum cleaner equipped with the same. for the purpose of providing
  • an electric blower in which a first flow path circulates inside a blower section and a second flow path circulates inside a motor section, wherein the motor section rotates a shaft, a bearing that rotatably supports the rotating shaft, a rotor core fixed to the rotating shaft, a stator core that surrounds the outer periphery of the rotor core, a stator core that holds the stator core, and an upstream radial direction on the side surface.
  • An opening and a motor housing having a downstream radial opening are provided, and the blower section includes an impeller fixed to the tip of the rotating shaft, a fan casing covering the outer circumference of the impeller, and the motor section. and a downstream housing surrounding the downstream outer periphery of the motor section, wherein the first flow path extends between the inner wall and the outer wall of the upstream housing and the downstream Circulating between the inner wall and the outer wall of the side housing, the second flow path extends from the downstream side radial opening to the rotation axis direction opening of the downstream side motor housing, the inside of the motor section, the upstream side radial opening, Circulates between the inner wall of the motor housing and the upstream housing and between the inner wall of the motor housing and the downstream housing, and faces the downstream radial opening on the downstream side of the downstream housing.
  • An electric blower with an annular diffuser was used.
  • an electric blower that is compact and lightweight, has high efficiency in a wide air volume range, and has a high motor cooling efficiency, and a vacuum cleaner equipped with the electric blower. .
  • FIG. 1 is a longitudinal sectional view of an electric blower of one embodiment;
  • FIG. 4 is a plan view of the upstream housing of one embodiment;
  • FIG. 4 is a vertical cross-sectional view of the upstream housing of one embodiment;
  • FIG. 4 is a partial cross-sectional view of the upstream housing of one embodiment;
  • FIG. 4 is a plan view of the downstream housing of one embodiment;
  • FIG. 4 is a vertical cross-sectional view of the downstream side housing of one embodiment;
  • FIG. 4 is a partial cross-sectional perspective view of an example downstream housing.
  • FIG. 2 is an external view of a motor section of one embodiment;
  • FIG. 2 is a vertical cross-sectional view of the motor portion of one embodiment;
  • FIG. 4 is a longitudinal sectional view showing an example of the structure of the second channel;
  • FIG. 4 is a longitudinal sectional view showing an example of the structure of the second channel;
  • FIG. 4 is a longitudinal sectional view showing an example of the structure of the second channel;
  • 1 is a perspective view of an electric vacuum cleaner of one embodiment;
  • FIG. 1 is a longitudinal sectional view of an electric vacuum cleaner of one embodiment;
  • FIG. 4 is a graph comparing blower efficiencies of electric blowers of an example and a comparative example. 4 is a graph comparing temperature rises of electric blowers of an example and a comparative example.
  • FIG. 7 is a perspective view of vacuum cleaner 100
  • FIG. 8 is a longitudinal sectional view of vacuum cleaner 100.
  • the illustrated electric vacuum cleaner 100 is a rechargeable cordless stick vacuum cleaner in which a cleaner main body 110 is attached to a holding portion 120, and can be charged while placed on a charging base 130.
  • FIG. Although a rechargeable cordless stick cleaner is exemplified here, the electric blower 200 of the present invention may be incorporated in a non-rechargeable stick cleaner equipped with a power cord.
  • the cleaner main body 110 is a unit that can be used independently as a handy cleaner, and has a main body grip part 111 on the upper part to be gripped by the user when using it as a handy cleaner, and a lower part that can be used as a handy cleaner.
  • a suction opening 112 is provided for sucking dust when cleaning.
  • Inside the cleaner body 110 are a dust collection chamber 113 for collecting dust, an electric blower 200 for generating a suction airflow necessary for dust collection, a drive circuit 114 for driving the electric blower 200, and a drive circuit. It has a battery unit 115 that supplies power to 114 .
  • the holding part 120 is a unit to which the cleaner main body 110 can be attached and detached.
  • a suction body 122 for sucking dust and a connecting portion 122a for connecting the suction body 122 and the suction opening 112 are provided.
  • the body grip portion 111 of the cleaner body 110 is provided with a body switch portion 111a for turning on/off the drive of the electric blower 200 when used as a handy cleaner.
  • 121 is provided with a switch portion 121a for turning on/off the driving of the electric blower 200 when used as a stick cleaner.
  • FIG. 1A to 6 ⁇ Electric blower 200>
  • FIG. 1A to 6 ⁇ Electric blower 200>
  • FIG. 1A to 6 ⁇ Electric blower 200>
  • FIG. 1A to 6 ⁇ Electric blower 200>
  • FIG. 1A to 6 ⁇ Electric blower 200>
  • FIG. 1A to 6 ⁇ Electric blower 200>
  • FIG. 1A to 6 ⁇ Electric blower 200>
  • FIG. 1A is an external view of the electric blower 200
  • FIG. 1B is a longitudinal sectional view of the electric blower 200.
  • FIG. Since the electric blower 200 of the present embodiment is a blower that sucks in air from the upper air intake port 200a and discharges air from the lower air exhaust port 200b when the impeller 1 is rotated, Define downstream. Focusing on the installation direction of the rotating shaft 2, the axial direction and the radial direction are defined as shown in the figure. In this state, the air intake port 200a of the electric blower 200 is directed downward and the exhaust port 200b is directed upward so that dust can be sucked up from the suction port body 122 in the lower part of the electric vacuum cleaner 100 into the upper dust collection chamber 113. It is assumed that the electric blower 200 is installed inside the electric vacuum cleaner 100 (see FIG. 8).
  • the outer circumference of the electric blower 200 is covered with an outer shell that integrates the fan casing 3, the upstream housing 4, and the downstream housing 5. As shown in FIG. A specific method for integrating these will be described later.
  • a rotating shaft 2 is rotatably arranged inside the electric blower 200, and an impeller 1 that rotates integrally with the rotating shaft 2 is fixed to its upper end.
  • the impeller 1 is fixed by a nut screwed to the upper end of the rotating shaft 2, but the impeller 1 may be fixed by being press-fitted to the tip of the rotating shaft 2.
  • the electric blower 200 of the present embodiment can sufficiently cool the inside of the motor unit 202 while maintaining the suction force in a wide air volume range by circulating a desired air flow through the first flow path F1 and the second flow path F2.
  • the structure of is divided into the blower section 201 and the motor section 202 and will be described in order.
  • the blower unit 201 is a unit for the electric vacuum cleaner 100 to generate an air flow for sucking dust, and as shown in FIG.
  • An upstream diffuser blade 8 provided on the inner circumference, a downstream diffuser blade 9 provided on the inner circumference of the downstream housing 5, and the like are arranged.
  • the upper and lower diffuser blades are provided to control the flow velocity of the air flow on the downstream side of the impeller 1 and to control the static pressure. As long as it can be maintained, it is also possible to omit part or all of the diffuser blades. Each part will be described in order below.
  • FIGS. 2A and 2B are perspective views of the impeller 1
  • FIG. 2B is a longitudinal sectional view of the impeller 1.
  • FIG. The impeller 1 shown in both figures is an open-type mixed-flow impeller without a shroud plate. has a boss 13 of The impeller 1 of this embodiment may be a diagonal flow impeller having a shroud plate, a centrifugal impeller, or an axial flow impeller.
  • a metal sleeve 14 is integrally formed on the back side of the hub 11 coaxially with the boss 13 of the impeller 1 .
  • a sleeve 14 By using such a sleeve 14, it is possible to reduce the variation in the fitting gap between the impeller 1 and the rotating shaft 2, which is likely to occur when the sleeve is not used, and to reduce the imbalance of the impeller 1. Vibration and noise when the impeller 1 is rotationally driven can be reduced.
  • a convex portion 14 a is provided on the downstream side of the sleeve 14 . The function of this convex portion 14a will be described later.
  • the fan casing 3 is a cover that covers the outer circumference of the impeller 1 and is integrally molded of engineering plastic or thermoplastic resin. As shown in FIG. 1 shroud plate function.
  • FIGS. 3A to 3C are plan views of the upstream housing 4 viewed from the upstream side
  • FIG. 3B is a vertical cross-sectional view of the upstream housing 4
  • FIG. 3C is a partial cross-sectional view of the upstream housing 4 viewed from the outer circumference.
  • the shroud of the upstream housing 4 is partially omitted to show the shape of the upstream diffuser blade 8 (in particular, the positions of the leading edge 8a and the trailing edge 8b).
  • the upstream housing 4 and the upstream diffuser blades 8 are integrally molded from engineering plastic or thermoplastic resin. As shown in FIGS. Between the shrouds, a plurality of upstream diffuser blades 8 integrally formed therewith are arranged at regular intervals in the circumferential direction.
  • the length (chord length) from the leading edge 8a to the trailing edge 8b of the upstream diffuser blade 8 is longer on the outer wall 4b side than on the inner wall 4a side. This is because, downstream of the impeller 1, the wind speed on the outer peripheral side is faster than that on the inner peripheral side. It is for the purpose of planning. Although a configuration in which 15 upstream diffuser blades 8 are provided is exemplified here, the number of upstream diffuser blades 8 can be changed according to the specifications of the electric blower 200 .
  • projections 4c are provided at three equal intervals on the outer periphery of the outer wall 4b of the upstream housing 4, into which the claw portions 5c of the downstream housing 5, which will be described later, are fitted.
  • the upstream housing 4 and the downstream housing 5 can be integrated while being centered (see FIG. 1B).
  • fastening portions 4d are provided at two locations on the top surface of the upstream housing 4, and the motor portion 202 can be fastened there while being centered (FIG. 1B). reference).
  • a fitting portion 4e is provided on the outer periphery of the outer wall 4b of the upstream side housing 4 except for the protrusion 4c, and the lower end of the fan casing 3 is fitted into the fitting portion 4e and fixed by adhesion. By doing so, the fan casing 3 and the upstream housing 4 can be integrated while being centered (see FIG. 1B).
  • FIGS. 4A to 4C are views of the downstream housing 5 viewed from the upstream side
  • FIG. 4B is a vertical sectional view of the downstream housing 5
  • FIG. 4C is a partial cross-sectional perspective view of the downstream housing 5 viewed from the outer periphery.
  • the shroud of the downstream housing 5 is partially omitted to show the shape of the downstream diffuser blade 9 (in particular, the positions of the leading edge 9a and the trailing edge 9b).
  • the downstream housing 5 and the downstream diffuser blades 9 are integrally molded from engineering plastic or thermoplastic resin. As shown in FIGS. Between the shrouds, a plurality of downstream diffuser blades 9 integrally formed therewith are arranged at regular intervals in the circumferential direction. Here, a configuration in which 15 downstream diffuser blades 9 are provided is exemplified. This is because the number of blades 8 and the number of downstream diffuser blades 9 are matched.
  • claw portions 5c are provided at three locations on the outer circumference of the upper end of the downstream housing 5 at equal intervals, and a portion of the outer circumference of the upper end excluding the claw portions 5c has a fitting portion. 5d is provided.
  • annular diffuser 5 e without downstream diffuser blades 9 is provided on the downstream side of the downstream housing 5 . Details of the ring diffuser 5e will be described later.
  • either the inner wall 4a of the upstream housing 4 or the inner wall 5a of the downstream housing 5, or the outer wall 4b of the upstream housing 4 or the outer wall 5b of the downstream housing 5 is also integrated while their radial positions are substantially matched.
  • the inner surface of each flow path is made smooth and the loss in each flow path is reduced.
  • the trailing edge 8b of the upstream diffuser blade 8 and the leading edge 9a of the downstream diffuser blade 9 are arranged such that the pair of upstream diffuser blade 8 and downstream diffuser blade 9 function as one diffuser blade. , and the curved surfaces of the upstream diffuser blade 8 and the downstream diffuser blade 9 are smoothly continued.
  • the thickness of each diffuser blade increases from the upstream side to the downstream side, thereby increasing the static pressure and realizing high efficiency of the blower section 201.
  • FIG. 5A is a side external view of the motor section 202
  • FIG. 5B is a longitudinal sectional view of the motor section 202.
  • the illustrated motor unit 202 is a unit for rotating the impeller 1 of the blower unit 201, for example, within a range of 50,000 to 200,000 [rpm], and includes a rotating shaft 2, an upstream bearing 21, a downstream bearing 22, and a rotor core. 23, a stator core 24, a collar 25, an upstream motor housing 6, a downstream motor housing 7, and the like. Each part will be described in order below.
  • the motor section 202 has an upstream motor housing 6 and a downstream motor housing 7 as housings for holding the stator core 24 and the like. By fixing the upper surface of 6 with a screw or the like, the motor section 202 can be incorporated in the electric blower 200 (see FIG. 1B).
  • the upstream motor housing 6 is a housing made of metal (aluminum alloy material, steel material, etc.) that covers the upstream side of the motor section 202, and as shown in FIG. It has an opening 6a. As shown in FIG. 5B, the center of the upper surface of the upstream motor housing 6 protrudes upward, and an upstream bearing 21 that rotatably supports the upstream side of the rotating shaft 2 is provided inside the protrusion. There is Axial positioning of the upstream bearing 21 is performed by an upstream spacer 21 a below the upstream bearing 21 . An axial opening may be provided in the upstream side motor housing 6, and when provided, cooling air can flow to the bearing 21 for cooling.
  • the downstream motor housing 7 is a housing made of metal (aluminum alloy material, steel material, etc.) that covers the downstream side of the motor section 202, and as shown in FIG. It has a radial opening 7a and a plurality of axial openings 7b on its lower surface. As shown in FIG. 5B, the center of the lower surface of the downstream motor housing 7 protrudes downward, and a downstream bearing 22 that rotatably supports the downstream side of the rotating shaft 2 is provided inside the protrusion. There is A downstream spacer 22a above the downstream bearing 22 positions the downstream bearing 22 in the axial direction.
  • the radial opening 6a on the upstream side and the radial opening 7a on the downstream side are installed so as not to overlap in the axial direction.
  • the radial openings 6a and 7a of each motor housing are arranged so as to axially overlap the axial ends of the coils 24b, which will be described later.
  • the radial openings of each motor housing are arranged uniformly in the circumferential direction. there is As a result, the same flow field is formed at three locations in the circumferential direction inside the motor section 202, so that the temperature distribution in the circumferential direction can be reduced.
  • the number of radial openings and the number of diffuser blades may be set using a predetermined value other than 3 as the greatest common divisor.
  • each motor housing is made of metal to improve heat radiation performance, and a region (exposed portion 24a) where the stator core 24 is exposed is provided between the upper and lower motor housings.
  • each motor housing may be made of heat-resistant resin, or the upper and lower motor housings may be connected to cool the stator core 24. You may make it the structure which is not exposed.
  • the radial opening 7a and the axial opening 7b of the downstream motor housing 7 can cool the motor only with the radial opening 7a, the presence of the axial opening 7b causes pressure loss when the motor is cooled. can be reduced, the motor cooling air volume increases, and the motor can be cooled.
  • a rotor core 23 is fixed to the rotating shaft 2 in a region sandwiched between upper and lower spacers.
  • the rotor core 23 is the rotor of the motor section 202 and contains a rare earth bond magnet such as a samarium iron nitrogen magnet or a neodymium magnet.
  • a collar 25 is fixed to the rotary shaft 2 protruding from the upper portion of the upstream motor housing 6, and the upper portion of the collar 25 is provided with a concave portion 25a.
  • a stator core 24 that is a stator of motor section 202 is arranged on the outer periphery of motor section 202 so as to surround rotor core 23 that is a rotor of motor section 202 .
  • a coil 24b made of aluminum wire or copper wire covered with a covering material is wound around the winding frame of the stator core 24.
  • the stator core 24 can be an electromagnet, and the rotor core 23, rotating shaft 2, and impeller 1 can be rotated together at high speed.
  • the upstream motor housing 6 is driven into the upstream side of the stator core 24 and fixed with an adhesive
  • the downstream side motor housing 7 is driven into the downstream side and fixed with an adhesive.
  • the motor housing 7 can be integrated so that at the level of the upstream end of the coil 24b there is a radial opening 6a in the upstream motor housing 6 and at the level of the downstream end of the coil 24b. , a radial opening 7a in the downstream motor housing 7 may be provided.
  • the dimensions that define the shapes of the first flow path F1 and the second flow path F2 are the radial height H1 of the downstream diffuser blade 9, the inner surface of the annular diffuser 5e and the downstream motor housing 7.
  • the electric blower 200 of this embodiment In order to improve both the efficiency of the blower unit 201 and the improvement of the cooling efficiency of the motor unit 202, each dimension is set according to the following equations. The action of each formula will be described below with reference to FIG. 6A, which is an enlarged cross-sectional view of the right channel of FIG. 1B.
  • H1 ⁇ 0.5 ⁇ H2 More preferably, H1 ⁇ 0.66 ⁇ H2 (formula 1′) 0.5 ⁇ L2 ⁇ L1 ⁇ L2 (Equation 2) More preferably, L1 ⁇ 0.5 ⁇ L2 (Formula 2′) L3 ⁇ 2.5 ⁇ H1 (Equation 3) More preferably, L3 ⁇ 3 ⁇ H1 (Formula 3′)
  • H1 ⁇ 0.5 ⁇ H2 More preferably, H1 ⁇ 0.66 ⁇ H2 (formula 1′) 0.5 ⁇ L2 ⁇ L1 ⁇ L2 (Equation 2) More preferably, L1 ⁇ 0.5 ⁇ L2 (Formula 2′) L3 ⁇ 2.5 ⁇ H1 (Equation 3) More preferably, L3 ⁇ 3 ⁇ H1 (Formula 3′)
  • the air flow branched from the first flow path F1 inside the annular diffuser 5e flows into the motor section 202 through the radial opening 7a and the axial opening 7b on the downstream side.
  • the annular diffuser 5e by arranging the annular diffuser 5e on the outer peripheral side of the radial direction opening 7a on the downstream side, the diffusion of the air flow discharged from the downstream diffuser blade 9 in the outer peripheral direction is suppressed.
  • the airflow branched from the path F1 can be efficiently guided inside the motor section 202 .
  • the airflow that has cooled the exposed portion 24a merges with the first flow path F1 near the lower end of the inner wall 5a of the downstream housing 5 .
  • the radial height H1 of the downstream diffuser blade 9 is set large as in (Formula 1) or (Formula 1'), so that the downstream diffuser blade 9 is attached to the downstream motor housing 7. It can be brought closer, and the flow velocity in the outer peripheral region of the downstream side motor housing 7 can be increased.
  • the second flow path F2 allows the second flow path F2 to merge with the first flow path F1 in the presence region of the high-speed flow flowing through the downstream diffuser blade 9 . Therefore, due to the venturi effect of the high-speed first flow path F1, the air inside the motor section 202 can be efficiently sucked from the radial opening 6a on the upstream side. The cooling air can be efficiently taken in from the radial opening 7a and the axial opening 7b on the downstream side. That is, the venturi effect of the first flow path F1 can improve the cooling efficiency of the motor section 202 regardless of the operating range of the electric blower 200 .
  • FIG. 9 and 10 corresponds to an electric blower obtained by removing the annular diffuser 5e from the electric blower 200 of FIG. 6A.
  • the blowing capacity of the blower section 201 is greater than that of the electric blower of the comparative example which does not have the annular diffuser. It can be seen that not only the efficiency is improved, but also the cooling efficiency of the motor section 202 is improved.
  • the radial opening 7a on the downstream side is arranged on the downstream side from FIG. 6A.
  • the second flow path F2 branches from the first flow path F1 in the vicinity of the position where the innermost air flow of the first flow path F1 shown by the solid line adheres to the downstream motor housing 7.
  • the amount of air sucked into the motor section 202 from the radial opening 7a on the downstream side increases, and the cooling efficiency of the motor section 202 can be further improved as compared with FIG. 6A.
  • the radial opening 7a on the downstream side is arranged on the upstream side from FIG. 6A.
  • the innermost air flow adheres to the outer peripheral surface of the downstream motor housing 7 on the upstream side, so that the flow path expands in the annular diffuser 5e. It is possible to suppress the separation of the air flow in the area of , and the blowing efficiency of the blower section 201 can be further increased as compared with that in FIG. 6A.
  • FIG. 6D instead of the radial opening 7a and the axial opening 7b, a corner opening 7c having both functions is provided. In this case, the same effect as in FIG. 6B can be obtained with a simplified configuration.
  • the annular diffuser 5e is provided on the downstream side of the downstream housing 5, but the annular diffuser 5e may be omitted.
  • the downstream diffuser blade is extended to at least the axial position facing the radial opening 7a on the downstream side. 9 should be longer.
  • cooling by the venturi effect of this configuration can cool the motor without the diffuser blades of the upstream housing and the downstream housing.
  • an electric blower that is compact and lightweight, has high efficiency in a wide air volume range, and has a high motor cooling efficiency, and a vacuum cleaner equipped with the electric blower are provided. be able to.
  • the present invention is not limited to the above-described embodiments, and includes various modifications.
  • the above embodiments have been described in detail to facilitate understanding of the present invention, and are not necessarily limited to those having all the described configurations.
  • it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment and it is also possible to add the configuration of another embodiment to the configuration of one embodiment.
  • DESCRIPTION OF SYMBOLS 100 Vacuum cleaner, 110... Vacuum cleaner main body, 111... Main body grip part, 111a... Main body switch part, 112... Air intake opening, 113... Dust collection chamber, 114... Drive circuit, 115... Battery unit, 120... Holding part, DESCRIPTION OF SYMBOLS 121... Grip part 121a... Switch part 122... Inlet body 122a... Connection part 130... Charging stand 200... Electric blower 200a... Intake port 200b... Exhaust port 201... Air blower part 202... Motor part, DESCRIPTION OF SYMBOLS 1... Impeller 11... Hub 11a... Hub convex part 12... Blade 13... Boss 13a... Boss curved surface 14...

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

Abstract

Dans la présente invention, une unité moteur comprend un arbre rotatif, un palier, un noyau de rotor, un noyau de stator et un carter de moteur ayant une ouverture radiale côté amont et une ouverture radiale côté aval formées dans sa surface latérale. Une unité ventilateur comporte une turbine fixée à l'extrémité distale de l'arbre rotatif, un carter de ventilateur recouvrant la périphérie de la turbine, un boîtier côté amont entourant la périphérie côté amont de l'unité moteur, et un boîtier côté aval entourant la périphérie côté aval de l'unité moteur. Un premier trajet d'écoulement passe entre une paroi interne et une paroi externe du boîtier côté amont et entre une paroi interne et une paroi externe du boîtier côté aval. Un second trajet d'écoulement traverse l'ouverture radiale côté aval ou une ouverture en direction d'axe de rotation dans le boîtier de moteur côté aval, passe à l'intérieur de l'unité moteur, de l'ouverture radiale côté amont, entre le carter de moteur et la paroi interne du boîtier côté amont, et entre le carter de moteur et la paroi interne du boîtier côté aval. Sur le côté aval du boîtier côté aval, un diffuseur annulaire faisant face à l'ouverture radiale côté aval est prévu.
PCT/JP2022/000839 2021-07-14 2022-01-13 Ventilateur électrique et aspirateur électrique équipé de celui-ci WO2023286293A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP2021071082A (ja) * 2019-10-30 2021-05-06 日立グローバルライフソリューションズ株式会社 電動送風機及びそれを備えた電気掃除機

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021071082A (ja) * 2019-10-30 2021-05-06 日立グローバルライフソリューションズ株式会社 電動送風機及びそれを備えた電気掃除機

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