JP7230585B2 - blowers and vacuum cleaners - Google Patents

Description

The present invention relates to an air blower and a vacuum cleaner.

An example of a conventional air blower is disclosed in Patent Document 1.

The electric blower described in Patent Document 1 is integrated with a brushless motor composed of a rotor, a stator, and a frame, an impeller, first guide vanes arranged on the outer periphery of the impeller, and the first guide vanes. A motor case which is configured to provide an air passage between itself and the outer peripheral surface of the stator, a fan case, and a second guide vane integrally formed from the outer peripheral surface of the core and extending from the outer peripheral surface of the core to the air passage. The first guide vane has substantially the same surface as the second guide vane and abuts the second guide vane to form a plurality of flow paths in the air passage. The first guide vane has a diffuser action on the airflow generated by the impeller.

As a result, when the brushless motor is driven, the heat generated in the core is conducted to the second guide vanes integrally formed with the core. Therefore, it is claimed that the heat of the core can be efficiently released to the outside of the brushless motor by forcibly cooling the second guide vane by the airflow generated by the impeller.

JP 2012-255352 A

However, in the electric blower disclosed in Patent Document 1, it is difficult to improve the blowing efficiency while efficiently cooling the motor.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an air blower capable of improving air blowing efficiency while efficiently cooling a motor.

A blower device according to an exemplary embodiment of the present invention includes a rotor including a shaft arranged along a vertically extending central axis, magnets fixed to the shaft, and radially facing the magnets. It includes a stator, an impeller fixed to the shaft and rotatable around the central axis, a diffuser arranged below the impeller, and a housing arranged below the diffuser. The housing includes an annular inner annular portion fixed to the stator, and an annular inner annular portion disposed radially outward of the inner annular portion and forming a first flow path between the inner annular portion and the inner annular portion in the radial direction. An outer annular portion and a first rib connecting the inner annular portion and the outer annular portion are provided. The diffuser is disposed above the base portion extending in a direction intersecting the central axis and the inner annular portion, arranged in the circumferential direction on the lower surface of the base portion, and arranged radially outward and radially outward of the inner annular portion. and a plurality of first stator vanes forming a second flow path that communicates with the direction inward.

ADVANTAGE OF THE INVENTION According to the air blower of this invention, the air blow efficiency can be improved, cooling a motor efficiently.

1 is a perspective view of a vacuum cleaner according to an exemplary embodiment of the invention; FIG. FIG. 2 is a perspective view of a blower device in accordance with an exemplary embodiment of the present invention; FIG. 3 is a longitudinal cross-sectional view of a blower device according to an exemplary embodiment of the invention; FIG. 4 is a top perspective view of a diffuser in accordance with an exemplary embodiment of the present invention; FIG. 5 is a bottom perspective view of a diffuser in accordance with an exemplary embodiment of the present invention; FIG. 6 is a bottom view of a diffuser in accordance with an exemplary embodiment of the invention; FIG. 7 is a perspective view of a housing in accordance with an exemplary embodiment of the invention; FIG. 8 is a plan view of the housing and stator and its surroundings according to an exemplary embodiment of the invention.

Exemplary embodiments of the invention will now be described with reference to the drawings. In this specification, the direction in which the central axis J of the blower 100 extends is referred to as the “vertical direction” or the “axial direction”, the direction orthogonal to the central axis J of the blower 100 is referred to as the “radial direction”, and the center of the blower 100 A direction along an arc centered on the axis J is called a “circumferential direction”. However, the above-mentioned "vertical direction" does not limit the direction of the air blower 100 when it is actually incorporated into a device.

Further, in this specification, the shape and positional relationship of each part of the vacuum cleaner A will be described with the direction approaching the floor surface F being defined as "downward" and the direction away from the floor surface F being defined as "upper". It should be noted that these directions are names used merely for explanation, and do not limit actual positional relationships and directions. Further, "upstream" and "downstream" indicate upstream and downstream, respectively, in the direction of flow of the gas sucked from the intake section 103 when the blower 100 is driven.

A cleaner A according to an exemplary embodiment of the invention will now be described. FIG. 1 is a perspective view of a vacuum cleaner A according to an exemplary embodiment of the invention. The vacuum cleaner A is a so-called stick-type vacuum cleaner, and includes a housing 102 having an intake section 103 and an exhaust section 104 on the bottom surface and the top surface, respectively. A power cord (not shown) is led out from the rear surface of the housing 102 . The power cord is connected to a power outlet (not shown) provided on the side wall of the living room to supply power to the cleaner A. The vacuum cleaner A may be a so-called robot-type, canister-type, or handy-type vacuum cleaner.

An air passage (not shown) connecting the intake section 103 and the exhaust section 104 is formed in the housing 102 . A dust collector (not shown), a filter (not shown), and the blower 100 are arranged in this order from the upstream side to the downstream side in the air passage. The blower device 100 has an impeller 30 which will be described later. Dirt such as dust contained in the gas flowing through the gas passage is blocked by the filter and collected in the dust collector formed in the shape of a container. The dust collector and filter are configured to be detachable from housing 102 .

A grip portion 105 and an operation portion 106 are provided on the upper portion of the housing 102 . The user can move the cleaner A by gripping the grip portion 105 . The operation unit 106 has a plurality of buttons 106a, and sets the operation of the cleaner A by operating the buttons 106a. For example, by operating the button 106a, it is instructed to start or stop driving the blower 100, change the rotation speed, or the like. A downstream end (upper end in the drawing) of a rod-shaped suction pipe 107 is connected to the suction portion 103 . A suction nozzle 108 is detachably attached to the suction pipe 107 at the upstream end of the suction pipe 107 . Dust on the floor surface F is sucked into the suction pipe 107 through the suction nozzle 108 .

The cleaner A includes a blower device 100, which will be described later. As a result, in the vacuum cleaner A, the air blowing efficiency of the air blowing device 100 can be improved while the motor 1 is efficiently cooled.

FIG. 2 is a perspective view of the blower device 100. FIG. FIG. 3 is a longitudinal sectional view of the blower device 100. FIG. Referring to FIGS. 2 and 3, blower device 100 includes motor 1 and impeller 30 rotationally driven by motor 1 . More specifically, blower device 100 includes rotor 10 , stator 20 , impeller 30 , diffuser 40 and housing 50 .

A motor 1 includes a rotor 10 and a stator 20 . The rotor 10 includes a shaft 11 and magnets 12 . The shaft 11 is arranged along a central axis J extending vertically. Magnet 12 is fixed to shaft 11 . The magnet 12 has a plurality of annular magnet pieces 121 aligned in the axial direction. An upper spacer 13 is arranged above the magnet 12, and a lower spacer 14 is arranged below it. The upper surface of the magnet 12 contacts the lower surface of the upper spacer 13 and the lower surface of the magnet 12 contacts the upper surface of the lower spacer 14 . In this embodiment, the magnet 12 is fixed to the radial outer surface of the shaft 11 with an adhesive. However, magnet 12 may be fixed to shaft 11 by other means, or may be indirectly fixed to shaft 11 via another member.

The stator 20 radially faces the magnet 12 . The stator 20 includes a stator core 21 made of a magnetic material, insulators 22 made of an insulating material, and coils 23 . Stator core 21 includes an annular core back 211 and a plurality of teeth 212 . The plurality of teeth 212 extend radially inward from the annular core back 211 and are arranged at substantially equal intervals in the circumferential direction. The insulator 22 includes an upper insulator 221 covering at least part of the upper surface of the tooth 212 and a lower insulator 222 covering at least part of the lower surface of the tooth 212 .

Coil 23 is formed by winding a conductive wire around teeth 212 via insulator 22 . That is, the stator 20 includes an annular core back 211, a plurality of teeth 212 extending radially inward from the core back 211 and arranged in a circumferential direction, and a plurality of coils 23 formed on the teeth 212. . An end of the conductor is electrically connected to the terminal 25 . Terminals 25 are housed in terminal holders 24 . The terminal holder 24 is a part of the lower insulator 222 and is formed as an integral member made of the same material as the lower insulator 222 . The terminal 25 is electrically connected to a substrate 80 which will be described later. Thereby, for example, power from an external power source is supplied to the conductors through the substrate 80 . Note that the terminal holder 24 may be configured as a separate member from the lower insulator 222 . Also, the conductor may be electrically connected to the substrate 80 by other means or other members.

Impeller 30 is fixed to shaft 11 . The impeller 30 includes a main plate 31 , multiple rotor blades 32 and a shroud 33 . The main plate 31 is a portion extending in a direction substantially perpendicular to the central axis J. As shown in FIG. The multiple rotor blades 32 extend upward from the upper surface of the main plate 31 and are arranged at substantially equal intervals in the circumferential direction. The shroud 33 is arranged above the main plate 31 and is connected to the upper ends of the plurality of rotor blades 32 .

The impeller 30 is configured by a nut 34 arranged above the main plate 31, a washer 35 arranged between the main plate 31 and the nut 34 in the axial direction, and a bush 36 arranged on the lower surface of the main plate 31. Fixed to the top edge. Thereby, the impeller 30 is fixed to the shaft 11 and rotatable around the central axis J. As shown in FIG. The impeller may be a so-called mixed flow impeller. That is, the main plate 31 may be a curved surface that extends downward as it goes radially outward. Additionally, the impeller may not have a shroud.

The shroud 33 is provided with an axially opening aperture 37 at its center. Therefore, when the impeller 30 rotates due to the rotation of the motor 1 , the gas above the shroud 33 is drawn downward through the openings 37 and flows radially outward by the moving blades 32 . discharged to the outside.

Impeller 30 is surrounded by impeller cover 70 . That is, the impeller cover 70 surrounds the impeller 30 radially outward and upward. An intake port 71 is formed in the center of the impeller cover 70 . The intake port 71 communicates with the opening 37 . That is, the gas arranged near the intake port 71 is sucked into the impeller cover 70 by the rotation of the impeller 30 and sucked into the impeller 30 through the opening 37 .

Diffuser 40 is arranged below impeller 30 . The diffuser 40 includes a base portion 41 and first stator vanes 42 . The base portion 41 expands in a direction intersecting with the central axis J. As shown in FIG. That is, the base plate 41 may spread in a direction substantially orthogonal to the central axis J, or may have an inclined surface or a curved surface that expands upward as it separates from the central axis J, for example. The first stator vanes 42 are arranged in the circumferential direction on the lower surface of the base portion 41 . In this embodiment, the diffuser 40 further includes a second stator vane 43 and an outer cylinder portion 44 . The outer tubular portion 44 is a tubular portion extending downward from the radial outer edge 411 of the base portion 41 . A radial outer edge 411 of the base portion 41 and the outer cylindrical portion 44 are connected by the second stationary blades 43 . Details of the diffuser 40 will be described later.

The housing 50 is arranged below the diffuser 40 . The housing 50 includes an annular inner annular portion 51 , an annular outer annular portion 52 and first ribs 53 . The inner annular portion 51 and the outer annular portion 52 are concentric. The inner annular portion 51 is fixed to the stator 20 . More specifically, the inner annular portion 51 is arranged above the stator core 21 and fixed to each other by a fixing member 56 . In addition, the inner annular portion 51 and the stator 20 may be fixed by other means or other members.

The outer annular portion 52 is arranged radially outward of the inner annular portion 51 . The outer annular portion 52 is a tubular portion extending in the axial direction. The upper end portion of the outer annular portion 52 is fixed to the outer cylindrical portion 44 and the lower end portions of the impeller cover 70 . The inner annular portion 51 and the outer annular portion 52 are connected by a first rib 53 . In this embodiment, the first rib 53 is a portion extending in the radial direction. Note that the first rib 53 may be a portion extending in a direction crossing the radial direction. The outer annular portion 52 and the inner annular portion 51 form a first flow path C1 between them in the radial direction. The first flow path C1 is a cylindrical space extending in the axial direction, radially outward of the impeller 30 . In this embodiment, the radial inner surface of the outer cylindrical portion 44 and the radial inner surface of the outer annular portion 52 are substantially flush, and the radial outer edge 411 of the base portion 41 and the radial outer edge of the inner annular portion 51 are substantially flush. is one. That is, the gas guided downward by the second stationary blade 43 flows downward in the first flow path C1. The first flow path C<b>1 is configured by dividing a cylindrical space around the central axis J by the first ribs 53 in the circumferential direction. The gas discharged from the impeller 30 flows downward between the second stationary blades 43 of the diffuser 40 in the circumferential direction, and flows downward through the first flow path C1. In FIG. 3, the first flow path C1 is indicated by a dashed arrow. Note that the diffuser 40, housing 50, and impeller cover 70 may be fixed to each other with different configurations.

The housing 50 further includes a second rib 54 and a bearing retainer 55 . The second rib 54 extends in a direction approaching the central axis J from the inner annular portion 51 . In the present embodiment, the second ribs 54 extend radially inward and are arranged at equal intervals in the circumferential direction. The bearing holding portion 55 is connected to the radially inner end portion of the second rib 54 and has a tubular shape extending in the axial direction. The bearing holding portion 55 is substantially coaxial with the inner annular portion 51 and the outer annular portion 52 . A bearing 60 is fixed to the radial inner surface of the bearing holding portion 55 . Bearing 60 rotatably supports shaft 11 .

The second rib 54 extends upward as the central axis J approaches. At least part of the bearing 60 is arranged above the lower end of the first stationary blade 42 . That is, at least a portion of the bearing 60 radially overlaps the radially inner end of the first stationary blade 42 via the bearing holding portion 55 . As a result, for example, compared to the case where the radially inner end of the first stator vane 42 extends to the vicinity of the shaft 11 and the upper end of the bearing 60 is arranged below the lower end of the first stator vane 42, the The axial length of the blower device 100 can be reduced. In addition, since the bearing 60 can be arranged as close to the impeller 30 as possible, the load received by the bearing 60 when the impeller 30 rotates is reduced compared to the case where the bearing 60 is arranged below the above configuration. can do.

The inner annular portion 51, the outer annular portion 52 and the first rib 53 are a single member. That is, the inner annular portion 51, the outer annular portion 52, and the first ribs 53 are integral members that are continuously molded from the same material. Thereby, the mass productivity of the housing 50 is improved, and the rigidity is also improved. Furthermore, since the inner annular portion 51, the outer annular portion 52, and the first ribs 53 are a single member, the dimensional accuracy of the inner annular portion 51, the outer annular portion 52, and the first ribs 53 is improved. The dimensional accuracy of the first flow path C1 is improved, and the generation of turbulence in the first flow path C1 can be suppressed. In addition, the inner annular portion 51, the outer annular portion 52, and the first rib 53 may be configured by two or more members.

A lower housing 58 is arranged below the stator 20 . The lower housing 58 is fixed to the stator core 21 and the inner annular portion 51 by fixing members 56 . Note that the lower housing 58 may be fixed to at least part of the stator core 21 or the housing 50 by other fixing means. The lower housing 58 has a first protrusion 581 that protrudes upward at its radially inner end. A bearing 60 is fixed to the radially inner surface of the first projecting portion 581 . That is, the rotor 10 of this embodiment is rotatably supported around the central axis J by the bearing 60 arranged above the stator 20 and the bearing 60 arranged below the stator 20 .

A bracket 59 is arranged below the lower housing 58 . The bracket 59 is a member that extends in a direction substantially perpendicular to the central axis J. As shown in FIG. The lower housing 58 has a second protrusion 582 that protrudes downward. The lower housing 58 and bracket 59 are fixed by a fixing member (not shown) penetrating through the second projecting portion 582 .

Bracket 59 includes a downwardly extending bracket protrusion 591 . A substrate 80 is arranged below the bracket 59 . The substrate 80 is a plate-like member extending in a direction substantially orthogonal to the central axis J. As shown in FIG. The substrate 80 is fixed to the bracket protrusion 591 by a fixing member 592 .

The diffuser 40 will now be described with reference to FIGS. 4-6. FIG. 4 is a top perspective view of diffuser 40 in accordance with an exemplary embodiment of the present invention. FIG. 5 is a bottom perspective view of diffuser 40 in accordance with an exemplary embodiment of the present invention. FIG. 6 is a bottom view of diffuser 40 in accordance with an exemplary embodiment of the invention.

Referring to FIGS. 3 and 4 to 6 , diffuser 40 includes base portion 41 and a plurality of first stator vanes 42 . The base portion 41 expands in a direction intersecting with the central axis J. As shown in FIG. In this embodiment, the base portion 41 expands in a direction substantially orthogonal to the central axis J. As shown in FIG. The plurality of first stator vanes 42 are arranged in the circumferential direction on the lower surface of the base portion 41 . The plurality of first stator vanes 42 extend in a direction approaching the central axis J toward the front in the rotational direction R of the impeller 30 . The plurality of first stator vanes 42 form curved surfaces that are convex forward in the rotational direction R of the impeller 30 . The plurality of first stator vanes 42 are arranged above the inner annular portion 51 .

The diffuser 40 further includes a plurality of second stator vanes 43 and an outer cylinder portion 44 . The plurality of second stator vanes 43 are portions extending radially outward from the radial outer edge 411 of the base portion 41 . The outer tubular portion 44 is a tubular portion that is connected to the radial outer ends 433 of the plurality of second stationary blades 43 and extends in the axial direction. The outer tubular portion 44 is substantially coaxial with the outer annular portion 52 .

The diffuser 40 has a plurality of second stator vanes 43 circumferentially arranged radially outward of the base portion 41 . As a result, the gas flowing radially outward of the base portion 41 can be smoothly guided downward. Therefore, the blowing efficiency of the blower 100 is improved. Moreover, the blowing efficiency of the gas flowing through the first flow path C1 is also improved. The second stationary blades 43 extend downward toward the front in the rotational direction R of the impeller 30 . In a space radially outward of the radially outer edge 411 of the base portion 41 , flow passages are defined in the circumferential direction by the plurality of second stator vanes 43 .

The plurality of first stationary blades 41 constitute a second flow path C2 that communicates the radially outer side and the radially inner side of the inner annular portion 51 . The second flow path C2 is indicated by dashed arrows in FIG. 3 and by solid arrows in FIGS. As a result, part of the gas flowing radially outward of the radially outer end 421 of the first stator vane 42 is smoothly guided toward the central axis J by the second flow path C2. Then, the coil 23 can be efficiently cooled by the gas hitting the coil 23 . On the other hand, another part of the gas flowing radially outward from the radial outer end 421 of the first stationary blade 42 flows radially outward from the radial outer edge 411 of the base portion 41 downward, It is discharged downward along the first flow path C1. That is, part of the gas discharged radially outward from the impeller 30 flows downward radially outward of the inner annular portion 51 along the first flow path C1, and the other part It flows in a direction approaching the central axis J along the second flow path C2. As a result, the motor 1 can be cooled while improving the blowing efficiency of the blower 100 .

At least part of the first stationary blade 42 preferably faces the inner annular portion 51 with a gap in the axial direction. As a result, compared to the case where the lower end of the first stator vane 42 is in contact with the upper surface of the inner annular portion 51, the gas flows smoothly through the second flow path C2, so that the cooling characteristics of the motor 1 are improved. improves.

More specifically, the axial clearance between the lower end of the first stator vane 42 and the upper surface of the inner annular portion 51 is longer than half the axial length at the radially outer end 421 of the first stator vane 42 . preferable. As a result, it is possible to increase the axial length of the first stator vane 42 and widen the axial gap between the lower end of the first stator vane 42 and the upper surface of the inner annular portion 51. The ventilation efficiency in C2 improves. Therefore, the motor 1 can be efficiently cooled.

The lower end 432 of the radially inner end 431 of the second stator vane 43 is preferably arranged above the lower end 422 of the radially outer end 421 of the first stator vane 42 . As a result, the gas guided by the second stationary blades 43 can be more smoothly guided to the second flow path C2, so that the motor 1 can be efficiently cooled.

More specifically, the axial length of the second stator vane 43 at the radial inner end 431 of the second stator vane 43 is approximately half the axial length at the radial outer end 421 of the first stator vane 42 . Preferably. As a result, the gas guided by the second stationary blades 43 can be more smoothly guided to the second flow path C2.

A lower end 434 of the radial outer end 433 of the second stator vane 43 is preferably arranged below the lower end 422 of the radial outer end 421 of the first stator vane 42 . As a result, the axial length of the second stator vane 43 in the vicinity of the radial outer end 433 of the second stator vane 43 can be increased. Therefore, of the gas flowing radially outward of the base portion 41, the gas flowing near the radial outer end 433 of the second stationary blade 43 can be smoothly guided downward. Therefore, the blowing efficiency of the blower 100 is improved. Moreover, the blowing efficiency of the gas flowing through the first flow path C1 is also improved.

As shown in FIG. 6, the first stator vanes 42 are preferably arranged at equal intervals in the circumferential direction. Thereby, the 2nd flow path C2 can be comprised at circumferential direction equal intervals. Therefore, the airflow flowing through the second flow path C2 can be made uniform in the circumferential direction, and the motor 1 can be cooled as uniformly as possible in the circumferential direction.

The second stationary blades 43 are preferably arranged at regular intervals in the circumferential direction. As a result, the airflow guided downward by the second stator vanes 43 can be uniformly approached in the circumferential direction, thereby suppressing the occurrence of turbulence in the flow path formed between the second stator vanes 43 in the circumferential direction. , the blowing efficiency of the blower 100 is improved.

The number of first stator vanes 42 and the number of second stator vanes 43 are preferably equal. Furthermore, the circumferential position of the radially outer end 421 of each first stator vane 42 is preferably substantially the same as the circumferential position of the lower end of each second stator vane 43 . As a result, the gas guided downward by each of the second stator vanes 43 is smoothly guided to the second flow path C2 by the first stator vanes 42, so that the air blowing efficiency is improved and the motor 1 is operated efficiently. can be cooled.

Next, the construction of the housing 50 and its periphery will be described with reference to FIGS. 7 and 8. FIG. FIG. 7 is a perspective view of housing 50 in accordance with an exemplary embodiment of the invention. FIG. 8 is a plan view of housing 50 and stator 20 and their surroundings according to an exemplary embodiment of the invention.

As shown in FIG. 7 , the upper surface 541 of the second rib 54 preferably extends downward toward the front in the rotational direction R of the impeller 30 . Accordingly, the gas that flows forward and downward in the rotation direction R of the impeller 30 along the second flow path C2 can be smoothly guided below the second ribs 54 . Therefore, the motor 1 can be cooled more efficiently. Note that the entire upper surface 541 of the second rib 54 may extend downward toward the front in the rotational direction R of the impeller 30, or, as in the present embodiment, a portion of the upper surface 541 may extend toward the front in the rotational direction R of the impeller 30. It may extend downward as it goes forward in the direction R.

The upper surface 531 of the first rib 53 preferably extends downward toward the front in the rotational direction R of the impeller 30 . As a result, the gas flowing forward and downward in the rotational direction R of the impeller 30 in the first flow path C1 can be smoothly guided forward and downward in the rotational direction R. Therefore, the blowing efficiency of the blower 100 is improved. Note that the entire upper surface 531 of the first rib 54 may extend downward toward the front in the rotational direction R of the impeller 30, or, as in the present embodiment, a portion of the upper surface 531 may extend toward the front in the rotational direction R of the impeller 30. It may extend downward as it goes forward in the direction R.

As shown in FIG. 8, the second ribs 54 are preferably arranged between the plurality of coils 23 in the circumferential direction. As a result, compared to the case where the second ribs 54 and the coils 23 overlap in the axial direction, the gas flowing in the second flow path C2 flows downward through between the second ribs 54 adjacent in the circumferential direction. Since it hits the coil 23, the motor 1 can be efficiently cooled.

Various modifications can be made to the various technical features disclosed in this specification without departing from the gist of the technical creation.

INDUSTRIAL APPLICATION This invention can be utilized for the air blower for vacuum cleaners, for example.

A vacuum cleaner F floor surface J center axis R rotation direction C1 first flow path C2 second flow path 100 blower 102 housing 103 intake section 104 exhaust section 105 grip section 106 operation section 106a button 107 suction pipe 108 suction nozzle 1 motor 10 Rotor 11 Shaft 12 Magnet 121 Magnet Piece 13 Upper Spacer 14 Lower Spacer 20 Stator 21 Stator Core 211 Core Back 212 Teeth 22 Insulator 221 Upper Insulator 222 Lower Insulator 23 Coil 24 Terminal Holder 25 Terminal 30 Impeller 31 Main Plate 32 Rotor Blade 33 Shroud 34 Nut 35 washer 36 bushing 37 opening 40 diffuser 41 base portion 411 radial outer edge 42 first stator vane 421 radial outer end 422 lower end 43 second stator vane 431 radial inner end 432 lower end 433 radial outer end 434 lower end 44 outer cylindrical portion 50 housing 51 inner annular portion 52 outer annular portion 53 first rib 531 upper surface 54 second rib 541 upper surface 55 bearing holding portion 56 fixing member 58 lower housing 581 first projecting portion 582 second projecting portion 59 bracket 591 bracket projecting portion 592 fixing Member 60 Bearing 70 Impeller Cover 71 Inlet 80 Board

Claims (11)

a rotor comprising a shaft arranged along a vertically extending central axis and magnets fixed to the shaft;
a stator radially facing the magnet;
an impeller fixed to the shaft and rotatable about the central axis;
a diffuser arranged below the impeller;
a housing arranged below the diffuser;
with
The housing is
an annular inner annular portion fixed to the stator;
an annular outer annular portion disposed radially outward of the inner annular portion and forming a first flow path between the inner annular portion and the inner annular portion in the radial direction;
a first rib connecting the inner annular portion and the outer annular portion;
with
The diffuser is
a base portion extending in a direction intersecting with the central axis;
A plurality of second flow passages arranged above the inner annular portion, arranged in the circumferential direction on the lower surface of the base portion, and forming second flow paths communicating between the radially outer side and the radially inner side of the inner annular portion. 1 stationary blade;
with
The housing is
a second rib extending from the inner annular portion in a direction approaching the central axis;
a tubular bearing holding portion connected to the radially inner end portion of the second rib and extending in the axial direction;
with
The stator is
an annular core back;
a plurality of teeth extending radially inward from the core back and arranged in a circumferential direction;
a plurality of coils formed on the teeth;
with
A bearing that rotatably supports the shaft is fixed to the radial inner surface of the bearing holding portion,
The second rib is arranged between the plurality of coils in the circumferential direction,
The second rib extends upward as it approaches the central axis,
At least part of the bearing is arranged above the lower end of the first stationary blade,
blower. a rotor comprising a shaft arranged along a vertically extending central axis and magnets fixed to the shaft;
a stator radially facing the magnet;
an impeller fixed to the shaft and rotatable about the central axis;
a diffuser arranged below the impeller;
a housing arranged below the diffuser;
with
The housing is
an annular inner annular portion fixed to the stator;
an annular outer annular portion disposed radially outward of the inner annular portion and forming a first flow path between the inner annular portion and the inner annular portion in the radial direction;
a first rib connecting the inner annular portion and the outer annular portion;
with
The diffuser is
a base portion extending in a direction intersecting with the central axis;
A plurality of second flow passages arranged above the inner annular portion, arranged in the circumferential direction on the lower surface of the base portion, and forming second flow paths communicating between the radially outer side and the radially inner side of the inner annular portion. 1 stationary blade;
with
The housing is
a second rib extending from the inner annular portion in a direction approaching the central axis;
a tubular bearing holding portion connected to the radially inner end portion of the second rib and extending in the axial direction;
with
The stator is
an annular core back;
a plurality of teeth extending radially inward from the core back and arranged in a circumferential direction;
a plurality of coils formed on the teeth;
with
A bearing that rotatably supports the shaft is fixed to the radial inner surface of the bearing holding portion,
The second rib is arranged between the plurality of coils in the circumferential direction,
The blower device, wherein the upper surface of the second rib extends downward toward the front in the rotational direction of the impeller. 3. The blower device according to claim 1, wherein at least part of said first stator vane faces said inner annular portion in the axial direction with a gap therebetween. 4. The blower device according to claim 3 , wherein an axial gap between the lower end of the first stator vane and the upper surface of the inner annular portion is longer than half of the axial length at the radially outer end of the first stator vane. . The blower device according to any one of claims 1 to 4 , wherein the diffuser has a plurality of second stator vanes circumferentially arranged radially outward of the base portion. The second stator vane extends downward toward the front in the rotational direction of the impeller,
The blower device according to claim 5 , wherein a lower end of the radially inner end of the second stator vane is arranged above a lower end of the radially outer end of the first stator vane. 7. The blower device according to claim 5 , wherein a lower end of the radially outer end of the second stator vane is arranged below a lower end of the radially outer end of the first stator vane. The blower according to any one of claims 5 to 7 , wherein the circumferential position of the radially outer end of each of the first stator vanes is substantially the same as the circumferential position of the lower end of each of the second stator vanes. The blower device according to any one of claims 1 to 8 , wherein the inner annular portion, the outer annular portion and the first rib are a single member. The blower device according to any one of claims 1 to 9 , wherein the upper surface of said first rib extends downward toward the front in the rotational direction of said impeller. A vacuum cleaner comprising the air blower according to any one of claims 1 to 10 .

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