JP2019112963A - Air blowing device and cleaner comprising the same - Google Patents

Abstract

To cool a motor without reducing air blowing efficiency.SOLUTION: An air blowing device 100 comprised in a cleaner comprises: a motor 110 comprising a rotor capable of rotating about a central axis CA extending in a vertical direction; an impeller 120 fixed to the rotor, and capable of rotating together with the rotor; a motor housing 31 arranged radially outside the motor; a blower case 32 arranged radially outside the motor housing; and a plurality of stator vanes 33 arranged between the motor housing and the blower case, and arranged in a circumferential direction. The plurality of stator vanes include at least one first stator vane 7 provided with a stator vane recess part 7a recessed from a surface of the stator vane. The motor housing is provided with a communicating hole 3a communicating with the outside from the inside of the motor housing. The communicating hole is provided between a rotation direction front end part and a rotation direction rear end part in the first stator vane, and communicates with the stator vane recess part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a blower and a vacuum cleaner including the same.

  Conventionally, a blower having a plurality of stationary blades is known and mounted on a vacuum cleaner or the like. For example, Patent Document 1 discloses an electric blower for a vacuum cleaner. In this electric blower, the air sucked from the intake port by the rotation of the impeller passes through the inside of the impeller, diffuser, and bracket, and is finally discharged to the outside of the electric blower while cooling the stator, the rotor, and the like.

JP, 2015-050507, A

  However, in the motor-driven blower of Patent Document 1, the wind directly enters the inside of the bracket from the diffuser in order to cool the stator, the rotor, and the like. As a result, the blowing efficiency of the electric blower is reduced.

  An object of the present invention is to cool a motor without reducing the blowing efficiency.

  An exemplary blower according to the present invention comprises a motor having a rotor rotatable about a vertically extending central axis, an impeller fixed to the rotor and rotatable with the rotor, and radially outward from the motor. A motor housing disposed in the housing, a blower case disposed radially outward of the motor housing, and a plurality of stator blades disposed between the motor housing and the blower case and arranged in a circumferential direction; Equipped with The plurality of vanes includes at least one first vane provided with a vane recess recessed from the surface of the vane. The motor housing is provided with a communication hole communicating from the inside to the outside of the motor housing. The communication hole is provided between the front end portion in the rotational direction and the rear end portion in the rotational direction of the first stationary blade, and communicates with the vane recess.

  An exemplary vacuum cleaner of the present invention mounts the above-described blower.

  According to the exemplary blower of the present invention and the vacuum cleaner equipped with the same, the motor can be cooled without reducing the blowing efficiency.

FIG. 1 is an external view of a blower. FIG. 2 is a longitudinal cross-sectional view showing a configuration example of a blower. FIG. 3A is an enlarged view showing an example of the first stationary blade. FIG. 3B is a cross-sectional view of the vicinity of the first stationary blade viewed from the circumferential direction. FIG. 3C is a cross-sectional view of the vicinity of the first stationary blade as viewed from above in the axial direction. FIG. 4 is an enlarged view showing a first stationary blade according to a first modification. FIG. 5 is an enlarged view showing a first stationary blade according to a second modification. FIG. 6 is an enlarged view showing a first stationary blade according to a third modification. FIG. 7: is an example of the vacuum cleaner which mounts an air blower.

  Exemplary embodiments of the present invention will be described below with reference to the drawings. In the present specification, in the blower 100, the rotation axis of the motor 110 is referred to as "central axis CA", and the direction parallel to the central axis CA is referred to as "axial direction". The direction from the substrate 6 described later along the axial direction toward the impeller 120 described later is referred to as “axially upward” as one side in the axial direction, and the direction from the impeller 120 to the substrate 6 along the axial direction is the other side in the axial direction It is called "axially downward". In each component, the end in the upper axial direction is referred to as the “upper end”, and the position of the end in the upper axial direction is referred to as the “upper end”. In each component, the lower end in the axial direction is called "lower end", and the position of the lower end in the axial direction is called "lower end". Further, in the surface of each component, the surface facing upward in the axial direction is called “upper surface”, and the surface facing downward in the axial direction is called “lower surface”.

  The direction orthogonal to the central axis CA is called "radial direction". The direction toward the central axis CA along the radial direction is referred to as "radially inward", and the direction away from the central axis CA along the radial direction is referred to as "radially outward". In each component, the radially inner end is referred to as "radially inner end", and the position of the radially inner end is referred to as "radially inner end". In each component, the radially outer end is referred to as a "radially outer end", and the position of the radially outer end is referred to as a "radially outer end". Moreover, in the side surface of each component, the side surface facing inward in the radial direction is called "radially inner side surface", and the side surface facing outward in the radial direction is called "radially outer side surface".

  The rotational direction of the rotor 1 about the central axis CA may be referred to as “circumferential direction”. Further, the direction in which the rotating rotor 1 advances in the circumferential direction is referred to as "rotation direction forward FRD", and the direction in which the rotating rotor 1 retracts along the circumferential direction is referred to as "rotational direction backward BRD". In other words, "rotational direction backward BRD" is in the opposite direction to "rotational direction forward FRD". In each component, the end in the rotational direction front FRD is called "rotational front end", and the position of the end in the rotational direction front FRD is called "rotational front end". In each component, the end in the rotational direction rear BRD is referred to as "rotational direction rear end", and the position of the end in the rotational direction rear BRD is referred to as "rotational rear end".

  The names such as the direction, the end, and the face described above do not indicate the positional relationship and the direction in the case of being incorporated into an actual device.

<1. Configuration of blower>
First, a blower 100 according to an exemplary embodiment of the present invention will be described. FIG. 1 is an external view of a blower 100. FIG. 2 is a longitudinal sectional view showing a configuration example of the blower 100. As shown in FIG. In FIG. 1, a blower case 32 described later is displayed in a transparent manner to facilitate understanding of the configuration. FIG. 2 shows a cross-sectional structure in a case where the blower 100 is virtually cut by a plane including the central axis CA.

  The blower 100 includes a motor 110, an impeller 120, and a casing 3. The impeller 120 is an impeller having a plurality of blades 121 rotatable around a central axis CA. The impeller 120 is provided on the top of the motor 110. The impeller 120 is rotatable about a central axis extending in the vertical direction. The casing 3 accommodates at least a portion of the motor 110 and at least a portion of the impeller 120 therein.

<1-1. Motor configuration>
The motor 110 is an inner rotor type, and drives and rotates the impeller 120. The motor 110 includes a rotor 1, a stator 2, a bracket 4, and a substrate 6.

  The rotor 1 is rotatable around a central axis CA extending in the vertical direction. That is, the motor 110 has a rotor 1 rotatable around a central axis CA extending in the vertical direction. The rotor 1 has a shaft 10, a magnet 11, and a holding member 12. The shaft 10 is a rotating shaft extending in the vertical direction of the axial direction. An impeller 120 is attached to the upper portion of the shaft 10. In other words, the impeller 120 is fixed to the rotor 1 and is rotatable with the rotor 1. Further, the blades 121 are rotatable in the rotational direction of the rotor 1. The magnet 11 has a tubular shape extending in the axial direction, and is fixed to the radially outer surface of the shaft 10. The holding member 12 is fixed to the radially outer side surface of the magnet 11. The holding member 12 is disposed radially inward of the stator 2 and radially opposed to the stator 2.

  The motor 110 further includes a stator 2 disposed radially outward of the rotor 1. The stator 2 drives and rotates the rotor 1. The stator 2 has a stator core 21, an insulator 22, and a plurality of coil portions 23. That is, the stator 2 has the stator core 21 in which the coil part 23 is provided. Stator core 21 is, for example, a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction, and is fixed to casing 3. More specifically, the stator core 21 has a core back 21C and teeth 21T. The core back 21C has an annular shape surrounding the central axis CA. Here, “annular” includes the case where a part of one cycle is discontinuous, in addition to the case where the whole cycle is continuously connected. Further, "the core back 21C is annular" includes a plurality of core backs 21C and a plurality of core backs 21C arranged in the circumferential direction. In the present embodiment, a part of the radially outer end portion of the core back 21 </ b> C is fixed to the radially inner side surface of the cylindrical portion 312. The cylindrical portion 312 is a part of a motor housing 31 in the casing 3 described later. The teeth 21T extend in the radial direction from the core back 21C toward the holding member 12. The insulator 22 is an insulating member using, for example, a resin material, and covers at least a part of the stator core 21 and particularly covers the teeth 21T. The coil portion 23 is a winding member made of a conducting wire wound around the teeth 21 T of the stator core 21 via the insulator 22. That is, the insulator 22 electrically insulates between the stator core 21 and each coil portion 23. In addition, a plurality of coil portions 23 are arranged circumferentially around the shaft 10.

  The bracket 4 has a lower bearing holder 41 and a lid 42. The lower bearing holder 41 rotatably supports the shaft 10 via the lower bearing 41a. The lower bearing holder 41 is in the form of a cylinder extending in the axial direction. A lower bearing 41 a is disposed on the radially inner side surface of the lower bearing holder 41. The shaft 10 is inserted into the lower bearing holder 41 together with the lower bearing 41a. The lower bearing 41a may be, but not limited to, a ball bearing, a sleeve bearing or the like. The lid portion 42 extends radially outward from the lower end portion of the lower bearing holder 41 and covers the opening at the lower end portion of the casing 3.

  In the present embodiment, the substrate 6 is disposed axially lower than the bracket 4 and fixed to the lid 42. The substrate 6 is a plate-like circuit substrate, and is formed using a resin material such as epoxy. The substrate 6 is electrically connected to the coil unit 23. Further, the substrate 6 is electrically connected to a device or the like outside the motor 110 through a connection line (not shown) drawn to the outside of the motor 110. In addition, the electronic component 61 is mounted on the substrate 6. The electronic component 61 includes a power supply circuit and a control circuit of the motor 110.

<1-2. Configuration of casing>
The casing 3 has a motor housing 31, a blower case 32, and a vane 33. In other words, the blower 100 includes the motor housing 31, the blower case 32, and the vanes 33. The motor housing 31, the blower case 32, and the stator vanes 33 constitute the same member in the present embodiment, that is, they are an integral structure. However, the invention is not limited to this example, and at least one of them may be another member, that is, may not be an integral structure.

  The motor housing 31 accommodates at least a part of the motor 110 therein, and accommodates the rotor 1 and the stator 2 in the present embodiment. The motor housing 31 has a cylindrical shape with a lid. The motor housing 31 has an upper bearing holder 311 and a cylindrical portion 312.

  The upper bearing holder 311 rotatably supports the shaft 10 via the upper bearing 311a. Further, the upper bearing holder 311 spreads in the radial direction. In the center of the upper bearing holder 311, a through hole 311b penetrating in the axial direction is provided. An upper bearing 311a is disposed on the inner side surface of the through hole 311b. The shaft 10 is inserted into the through hole 311 b together with the upper bearing 311 a. The upper bearing 311a may be, but is not limited to, a ball bearing, a sleeve bearing, or the like.

  The cylindrical portion 312 extends axially downward from the radially outer end of the upper bearing holder 311. The cylindrical portion 312 is disposed radially outward of the motor 110. In other words, the motor housing 31 is disposed radially outward of the motor 110. A communication hole 3 a is provided in the motor housing 31. More specifically, the cylindrical portion 312 is provided with the communication hole 3a. The communication hole 3 a passes through the cylindrical portion 312 of the motor housing 31 in the radial direction. That is, the communication hole 3 a communicates from the inside to the outside of the motor housing 31. By providing the communication hole 3 a in the motor housing 31, the inside of the motor 110 can be cooled by the air flow that flows from the outside to the inside of the motor housing 31 through the communication hole 3 a. The arrangement of the communication holes 3a is not particularly limited. In the present embodiment, a plurality of communication holes 3a are provided at equal intervals in the circumferential direction. According to this configuration, since the communication holes 3a are equally distributed in the circumferential direction, the motor 110 can be cooled without deviation in the circumferential direction.

  Blower case 32 accommodates impeller 120 inside. The blower case 32 is disposed radially outward of the motor housing 31. An intake port 32 a is provided at an upper end portion of the blower case 32. The blower case 32 has a gap with the motor housing 31. The gap is a flow path of the air flow generated by the rotation of the impeller 120. At the lower end portion of the blower case 32, an air outlet 32 b is provided between the motor case 31 and the radially outer side surface of the motor housing 31. Due to the rotation of the impeller 120, the air sucked from the air inlet 32a flows axially downward between the motor housing 31 and the blower case 32, and is delivered to the outside of the casing 3 from the air outlet 32b. A part of the air flow flowing between the motor housing 31 and the blower case 32 flows into the inside of the motor housing 31 through the communication hole 3a, and is used to cool the stator 2 and the like. This configuration will be described later.

  The stator vanes 33 are disposed between the motor housing 31 and the blower case 32 and arranged in plural in the circumferential direction. Each stationary blade 33 is a connection portion connecting the motor housing 31 and the blower case 32 in the radial direction. The radially inner end of each vane 33 is connected to the radially outer surface of the motor housing 31. The radially outer end portion of each stationary blade 33 is connected to the radially inner side surface of the blower case 32.

  In addition, each vane 33 extends in the axial direction. The upper end portion of the stator blade 33 curves toward the rotational direction aft BRD as it goes axially upward. Therefore, the air flow generated by the rotation of the impeller 120 is likely to flow between the stator vanes 33 adjacent in the circumferential direction.

  The plurality of vanes 33 include at least one first vane 7 provided with a vane recess 7 a recessed from the surface of the vane 7. Hereinafter, among the plurality of vanes 33, the vane 7 provided with the vane recess 7a is referred to as the "first vane 7", and the vanes 331 other than the first vane 7 are "second vane 331". Call it The configuration of the first stationary blade 7 will be described later.

  The vane recess 7 a is formed between the forward end in the rotational direction of the first vane 7 and the aft end in the rotational direction at the upper portion of the first vane 7. Further, as viewed in the radial direction, the communication hole 3 a is formed between the front end in the rotational direction of the first stationary blade 7 and the rear end in the rotational direction. The communication hole 3a overlaps with a part of the stationary blade recess 7a as viewed in the radial direction, and communicates with the stationary blade recess 7a. That is, the communication hole 3a is provided between the front end in the rotational direction and the rear end in the rotational direction in the first stationary blade 7, and communicates with the stationary blade recess 7a. According to this configuration, the air flow generated by the rotation of the impeller 120 and flowing into the stationary blade recess 7 a smoothly flows into the gap between the motor 110 and the motor housing 31 through the communication hole 3 a. Therefore, the motor 110 can be cooled without reducing the blowing efficiency.

  In the second stationary blade 331, the stationary blade recess 7a is not configured. At the upper part of the second stator vane 331, the rotational direction front side surface and the rotational direction rear side surface are curved toward the rotational direction rear side BRD as going axially upward. Furthermore, the rotation direction front side surface is a curved surface convex toward the axial direction upper side and the rotation direction front FRD. The rotational direction rear side surface is a curved surface which is recessed toward the axial upper side and the rotational direction front FRD.

<1-3. Configuration example of first stator vane>
Next, the configuration of the first stationary blade 7 will be described. FIG. 3A is an enlarged view showing an example of the first stationary blade 7. FIG. 3B is a cross-sectional view of the vicinity of the first stationary blade 7 as viewed from the circumferential direction. FIG. 3C is a cross-sectional view of the vicinity of the first stationary blade 7 as viewed from above in the axial direction. Note that FIG. 3A corresponds to a portion surrounded by an alternate long and short dash line in FIG. Further, in FIG. 3A, the blower case 32 is omitted to facilitate understanding of the configuration. FIG. 3B shows a cross-sectional structure along dashed-dotted line A-A in FIG. 3A. FIG. 3C shows a cross-sectional structure along dashed-dotted line B-B in FIG. 3A.

  The first stationary blade 7 has a front wall 71 and a rear wall 72. The front wall 71 is disposed at the front end of the first stationary blade 7 in the rotational direction. The rear wall 72 is disposed at the rotational direction rear end of the first stationary blade 7. The front wall 71 and the rear wall 72 each have a longitudinal direction at least in the axial direction.

  Further, in the upper part of the first stationary blade 7, a stationary blade recess 7 a is provided between the rotational direction front wall 71 and the rotational direction rear wall 72 of the first stationary blade 7. In the present embodiment, as shown in FIG. 3A, the stator blade recess 7a is recessed axially downward from the front end in the rotational direction at the upper portion of the first stator blade 7. Further, as viewed in the radial direction, communication holes 3 a are provided between the front wall 71 and the rear wall 72 in the circumferential direction. According to this configuration, a part of the air flow flowing between the first stationary blade 7 and another stationary blade 33 adjacent in the rotational direction front FRD flows into the space between the front wall 71 and the rear wall 72. Therefore, part of the air flow can smoothly flow into the motor housing 31 through the communication hole 3a.

  The larger the diameter of the communication hole 3a, the easier it is for the air flow that flows into the stator blade recess 7a to flow inside the motor housing 31. Therefore, the circumferential width W1 of the first stationary blade 7 is preferably wider than the circumferential width W2 of the second stationary blade 331 other than the first stationary blade 7 among the plurality of stationary blades 33. According to this configuration, the circumferential width of the communication hole 3a can be made wider. Therefore, the cooling effect of the motor 110 can be improved.

  At the upper part of the first stationary blade 7, the rotation direction front side surface 71a of the front wall portion 71 is a curved surface that is directed axially downward as it goes to the rotation direction front FRD. The rotational direction front side surface 71a protrudes upward in the rotational direction forward FRD and the axial direction. According to this configuration, the air flow flowing between the first stationary blade 7 and the stationary blade 33 adjacent to the first stationary blade 7 in the rotational direction can be smoothly guided axially downward and forward in the rotational direction. . Thus, the blowing efficiency of the blower 100 can be improved.

  At the upper part of the first stationary blade 7, the rotational direction rear side surface 71b of the front wall 71 preferably extends in the axial direction as in the present embodiment. However, the rotational direction rear side surface 71b of the front wall portion 71 may be a curved surface directed in the circumferential direction as it goes upward in the axial direction. In the case where the rotation direction rear side surface 71b of the front wall portion 71 extends in the axial direction, when the first stationary blade 7 molded using a mold is released from the mold, the mold is vertically moved in the axial direction. It can be pulled out. Therefore, the first stationary blade 7 can be molded without using a complex-shaped mold.

  At the top of the first stator vanes 7, the rotational direction rear side surface 72 a of the rear wall 72 is a curved surface directed downward in the axial direction as it proceeds to the rotational direction forward FRD. The rotational direction rear side surface 72a is recessed toward the rotational direction front FRD and the axial direction upper side. According to this configuration, the air flow flowing between the first stationary blade 7 and the stationary blade 33 adjacent to the first stationary blade 7 in the rotational direction rear BRD is smoothly made forward in the rotational direction FRD and axially downward. It can be induced. Thus, the blowing efficiency of the blower 100 can be improved.

  Further, the upper end of the rear wall portion 72 is positioned forward in the rotational direction FRD with respect to the adjacent vanes 33 in the rotational direction BRD of the first stationary vane 7. According to this configuration, when the first stationary blade 7 molded using a mold is released from the mold, the mold can be pulled up and down in the axial direction. Therefore, the first stationary blade 7 can be molded without using a complex-shaped mold.

  Next, the first stationary blade 7 further includes a connection wall portion 73. The connection wall portion 73 is a lower portion of the first stationary blade 7 in the present embodiment. More specifically, the connection wall 73 connects the lower end of the front wall 71 and the lower end of the rear wall 72. In other words, the front wall 71 protrudes axially upward from the rotational direction front end of the upper end of the connection wall 73. The rear wall 72 protrudes axially upward from the rotational direction rear end of the upper end of the connection wall 73, and extends upward in the axial direction toward the rotational direction BRD in the upper portion of the first vane 7. According to this configuration, all air flows flowing between the front wall 71 and the rear wall 72 can flow through the communication hole 3a.

  In the present embodiment, the upper surface 73 a of the connection wall portion 73 is axially downwardly directed inward in the radial direction. Further, the upper surface 73a of the connection wall 73 is also the bottom surface of the stationary blade recess 7a. Therefore, in other words, the bottom surface of the stator vane recess 7a is shaped so as to be directed axially downward as it goes radially inward. The upper surface 73a may be a flat inclined surface, or may be a curved surface convex upward in the axial direction and inward in the radial direction. Alternatively, the upper surface 73a may be a curved surface which is recessed downward in the axial direction and radially outward. According to this configuration, the air flow that flows between the front wall portion 71 and the rear wall portion 72 can flow smoothly to the communication hole 3 a along the upper surface 73 a of the connection wall portion 73.

  The air flow can be made to flow more smoothly by inclining or curving the inner side surface of the communication hole 3a. Therefore, for example, as shown in FIG. 3C, the circumferential side surface of the communication hole 3a preferably goes forward in the rotational direction FRD as it goes radially inward. Here, in the present embodiment, both the inner side surface 30a in the rotational direction front of the communication hole 3a and the inner side surface 30b in the rotational direction rear of the communication hole 3a are directed in the rotational direction forward FRD as they go radially inward. It becomes a shape. The inner side surface 30a in the rotational direction front of the communication hole 3a is one of the circumferential side surfaces of the communication hole 3a, and is the rotational direction rear side of the motor housing 31 at the edge in the rotational direction front of the communication hole 3a. The inner side surface 30b at the rear in the rotational direction of the communication hole 3a is another one of the circumferential side surfaces of the communication hole 3a, and is the front side in the rotational direction of the motor housing 31 at the edge at the rear in the rotational direction of the communication hole 3a. . However, the present invention is not limited to the example of the present embodiment, and at least one of the inner side surface 30a in the rotational direction front of the communication hole 3a and the inner side surface 30b in the rotational direction rear of the communication hole 3a may have the above shape. . According to these configurations, the air flow that flows between the front wall portion 71 and the rear wall portion 72 can flow smoothly into the communication hole 3a. Therefore, the decrease in the blowing efficiency of the motor 110 due to the flow of a part of the air flow between the first stationary blade 7 and the other stationary blade 33 between the front wall 71 and the rear wall 72 is suppressed. it can.

  Also, these inner side surfaces 30a, 30b may be a curved surface or a flat surface having a convex shape toward the inner side in the radial direction and the rear in the rotational direction, but preferably the outer side in the radial direction as shown in FIG. 3C. And it is a curved surface convex toward the front in the rotational direction. According to this configuration, the air flow of the communication hole 3a can be made to flow more smoothly.

  Also, for example, as shown in FIG. 3B, the inner surface in the axial direction of the communication hole 3a preferably goes axially downward as it goes radially inward. Here, in the present embodiment, both the inner surface 30c above the communication hole 3a in the axial direction and the inner surface 30d below the communication hole 3a in the axial direction have a shape directed downward in the axial direction as it goes radially inward. . The inner surface 30c above the communication hole 3a in the axial direction is one of the inner surfaces in the axial direction of the communication hole 3a, and is the upper surface of the motor housing 31 at the edge above the communication hole 3a in the axial direction. The inner surface 30d below the communication hole 3a in the axial direction is another one of the inner surfaces in the axial direction of the communication hole 3a, and is the lower surface of the motor housing 31 at the edge in the axial direction below the communication hole 3a. However, the present invention is not limited to the example of the present embodiment, and at least one of the lower surface of the motor housing 31 at the axial upper edge of the communication hole 3a and the upper surface of the motor housing 31 at the axial lower edge of the communication hole 3a. It is only necessary to point axially downward as going radially inward. The inner surface 30c is the lower surface of the motor housing 31 at the upper end in the axial direction of the communication hole 3a, and the inner surface 30d is the upper surface of the motor housing 31 at the lower end in the axial direction of the communication hole 3a. The inner surfaces 30c and 30d may be inclined surfaces having a planar shape, or may be convex or concave curved surfaces in the axial direction and the radial direction. According to these configurations, the air flow flowing into the communication hole 3 a from between the front wall 71 and the rear wall 72 can be smoothly flowed into the motor housing 31. Therefore, it is possible to suppress a decrease in the air blowing efficiency of the motor 110 caused by flowing a part of the air flow flowing to the stationary blade recess 7 a between the front wall 71 and the rear wall 72.

<1-4. Modification of the embodiment>
Next, first to third modifications of the embodiment will be described.

<1-4-1. First Modified Example>
In the first modification, a configuration different from that of the above-described embodiment will be described. The same components as those in the embodiment are given the same reference numerals, and the description thereof may be omitted.

  FIG. 4 is an enlarged view showing a first stationary blade 7 according to a first modification. Note that FIG. 4 corresponds to a portion surrounded by an alternate long and short dash line in FIG. Further, in FIG. 4, the blower case 32 is omitted to facilitate understanding of the configuration.

  In the first modification, as shown in FIG. 4, the upper end of the front wall 71 is axially above the upper end of the rear wall 72 at the upper portion of the first stationary blade 7. Therefore, the vane recess 7 a is recessed axially downward along the shape of the upper portion of the first vane 7 from the rotational direction rear end of the first vane 7.

  Further, in the upper part of the first stationary blade 7, the rotational direction rear side surface 71 b of the front wall portion 71 is a curved surface directed downward in the axial direction toward the forward FRD in the rotational direction. The rotational direction rear side surface 71b is recessed toward the rotational direction front FRD and the axial direction upper side.

  Even with such a configuration, part of the air flow flowing between the first stationary blade 7 and another stationary blade 33 adjacent in the rotational direction aft BRD is between the front wall 71 and the rear wall 72. It can flow smoothly.

<1-4-2. Second Modified Example>
In the second modification, a configuration different from the above-described first modification will be described. The same components as those in the above-described embodiment and the first modification may be denoted by the same reference numerals, and the description thereof may be omitted. The configuration of the second modification described below is also applicable to the above-described embodiment.

  FIG. 5 is an enlarged view showing a first stationary blade 7 according to a second modification. Note that FIG. 5 corresponds to a portion surrounded by an alternate long and short dash line in FIG. Further, in FIG. 5, the blower case 32 is omitted to facilitate understanding of the configuration.

  In the first modification, as shown in FIG. 5, the front wall 71 is a member different from the rear wall 72 and the connection wall 73. The rear wall 72 is part of the same member as the connection wall 73. In other words, the lower end portion of the front wall portion 71 contacts the upper end portion of the connection wall portion 73 at the front end portion in the rotational direction of the first stationary blade 7. The rear wall 72 protrudes axially upward from the rotational direction rear end of the upper end of the connection wall 73, and extends toward the rotational direction BRD as it extends axially upward. In addition, it is not limited to the illustration of FIG. 5, The front wall 71 is a part of the same member as the connection wall 73, and the rear wall 72 is a member different from the front wall 71 and the connection wall 73 It may be

  The front wall 71 is a part of the same member as one of the motor housing 31 and the blower case 32. That is, one end of the front wall portion 71 in the radial direction is connected to one of the motor housing 31 and the blower case 32. The other radial end of the front wall 71 contacts the other of the motor housing 31 and the blower case 32. In other words, the front wall portion 71 radially protrudes from one of the radial side surfaces of the motor housing 31 and the blower case 32 between the motor housing 31 and the blower case 32. The radial tip end of the front wall portion 71 contacts the other radial side surface of the motor housing 31 and the blower case 32.

  Furthermore, the rear wall 72 is a part of the same member as the other of the motor housing 31 and the blower case 32. That is, one end of the rear wall 72 in the radial direction contacts one of the motor housing 31 and the blower case 32. The other radial end of the rear wall 72 is connected to the other of the motor housing 31 and the blower case 32. In other words, the rear wall portion 72 radially protrudes from the other radial side surface of the motor housing 31 and the blower case 32 between the motor housing 31 and the blower case 32. The radial tip of the rear wall 72 contacts one of the radial side surfaces of the motor housing 31 and the blower case 32.

  The connection wall 73 is a part of the same member as the other of the motor housing 31 and the blower case 32 in the third modified example, similarly to the rear wall 72. However, when the connection wall 73 is a part of the same member as the front wall 71, the connection wall 73 becomes a part of the same member as one of the motor housing 31 and the blower case 32 as in the front wall 71. .

  According to such a configuration, when the front wall portion 71 molded together with one of the motor housing 31 and the blower case 32 is released from the mold, the mold can be pulled up and down in the axial direction. Further, when the rear wall portion 72 molded together with the other of the motor housing 31 and the blower case 32 is released from the mold, the mold can be removed in the axial direction. Therefore, for example, as shown in FIG. 5, even if the first stationary blade 7 has a complicated shape in which the front wall 71 and the rear wall 72 overlap in the axial direction, a mold having a complicated shape should be used. Instead, the first stationary blade 7 can be formed.

1-4-3. Third Modified Example>
In the third modification, a configuration different from the above-described second modification will be described. In addition, the same components as those in the above-described embodiment and the second modification may be denoted by the same reference numerals, and the description thereof may be omitted. The configuration of the third modification described below is also applicable to the above-described embodiment.

  FIG. 6 is an enlarged view showing a first stationary blade 7 according to a third modification. 6 corresponds to a portion surrounded by an alternate long and short dash line in FIG. Further, in FIG. 6, the blower case 32 is omitted to facilitate understanding of the configuration.

  In the third modification, as shown in FIG. 6, the motor housing 31 has an upper motor housing 31a and a lower motor housing 31b. The lower motor housing 31b is attached axially lower than the upper motor housing 31a. The upper motor housing 31 a may be a member different from the blower case 32, or may be a part of the same member as the blower case 32. On the other hand, the lower motor housing 31 b is a member different from the blower case 32. Alternatively, when the blower case 32 is composed of a plurality of assembleable members, the upper motor housing 31a is a part of the same member as one member of the blower case 32, and the lower motor housing 31b is other than the blower case 32. It may be part of the same member as one member.

  The front wall 71 is a part of the same member as the upper motor housing 31a in FIG. 6, but is a member different from the lower motor housing 31b. However, the present invention is not limited to the example shown in FIG. 6, and the front wall 71 may be a member different from the upper motor housing 31a and may be a part of the same member as the lower motor housing 31b. That is, the front wall 71 may be part of the same member as one of the upper motor housing 31a and the lower motor housing 31b.

  The rear wall portion 72 is a member different from the upper motor housing 31a in FIG. 6, but is a part of the same member as the lower motor housing 31b. However, the rear wall 72 is not limited to the example of FIG. 6 and may be a part of the same member as the upper motor housing 31 a and may be a member different from the lower motor housing 31 b. That is, the rear wall portion 72 may be part of the same member as the other of the upper motor housing 31a and the lower motor housing 31b.

  The connection wall 73 is a part of the same member as the lower motor housing 31 b in the third modification as the rear wall 72. However, when the connection wall 73 is a part of the same member as the front wall 71, the connection wall 73 is a part of the same member as the upper motor housing 31a, as in the front wall 71.

  According to such a configuration, when the front wall portion 71 molded together with one of the upper motor housing 31a and the lower motor housing 31b is released from the mold, the mold can be removed vertically in the axial direction. When the connection wall 73 molded together with the other of the upper motor housing 31a and the lower motor housing 31b is released from the mold, the mold can be removed in the axial direction. Therefore, for example, as shown in FIG. 6, even if the first stationary blade 7 has a complicated shape in which the front wall 71 overlaps the rear wall 72 in the axial direction, a complex shaped mold is not used. The first stator vane 7 can be molded together with the upper motor housing 31a and the lower motor housing 31b.

<2. Example of use for vacuum cleaner>
Next, an example in which the above-described air blower 100 is mounted on the cleaner 200 will be described. FIG. 7 is a perspective view showing a configuration of a vacuum cleaner 200 on which the air blower 100 is mounted. The vacuum cleaner 200 includes a blower 100. More specifically, the cleaner 200 comprises a blower 100, a nozzle 210, and a main body 220. The blower 100 is mounted on the main body 220. A suction brush (not shown) is attached to the suction portion 211 of the nozzle 210. The main body 220 has a dust collection chamber 221 connected to the nozzle 210, a storage chamber 222 containing the air blower 100, and an exhaust space 223 connected to a plurality of exhaust ports (not shown). The opening of the blower 100 is connected to the dust collection chamber 221 via a dust collection filter (not shown). That is, the flow path of the air flow drawn by the air blower 100 is connected to the opening of the air blower 100 through the nozzle 210 and the dust collection chamber 221 sequentially from the air suction portion 211. The storage chamber 222 is connected to the exhaust space 223. The air flow sent out by the blower 100 is discharged from the exhaust port to the outside of the main body 220 through the exhaust space 223. Thereby, the vacuum cleaner 200 which has the air blower 100 which can suppress the fall of ventilation efficiency effectively is realizable.

  In addition, although the air blower 100 is mounted in the stick type vacuum cleaner 200 in FIG. 7, it is not limited to the illustration of this embodiment, You may mount in another type vacuum cleaner. For example, the cleaner 200 may be, for example, a canister type or a handy type.

<3. Other>
The embodiments of the present invention have been described above. The scope of the present invention is not limited to the above-described embodiment. The present invention can be implemented with various modifications without departing from the scope of the invention. Moreover, the above-mentioned embodiment can be combined arbitrarily arbitrarily.

  The present invention is suitable for apparatus for sucking or delivering gas and for which high static pressure is required. The present invention is applicable to other blowers such as fans and ventilators in addition to vacuum cleaners (see FIG. 7), and is also applicable to electric devices for other applications such as dryers.

  DESCRIPTION OF SYMBOLS 100 ... Air blower, 200 ... Vacuum cleaner, 210 ... Nozzle, 211 ... Intake part, 220 ... Main body, 221 ... Dust collection room, 222 ... Storage room, 223 ... · · Exhaust space, 110 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · , 2 ... stator, 21 ... stator core, 21 C ... core back, 21 T ... teeth, 22 ... insulator, 23 ... coil portion, 3 ... casing, 3 a ... communication Holes 30a, 30b: inner surface, 30c, 30d: inner surface 31, 31: motor housing, 31a: upper motor housing, 31b: lower motor housing, 311: upper bearing holder, 311a. · Upper bearing, 312 · · · · · · · · · · · · cylindrical portion, 32 · · · · · · blower case, 32a · · · intake port, 32b · · · · · · · · · · stator vanes, 331 · · · second stator vanes, 4 · · · · · Brackets, 41 · · · lower bearing holder, 41a · · · lower bearing, 42 · · · lid portion, 6 · · · · · · · · · · · · · · electronic components, 7 · · · 1st stationary blade, 7a · · · ... stationary blade recesses, 71 ... front 璧部, 71a ... rotation direction front side, 71b ... rotationally trailing side, 72 ... rear wall portion, 71a ... rotation direction rear side, 73 · · · Connection wall, 73b · · · Top surface, CA · · · · · · · · · · · · · · FRD forward direction of rotation, BRD backward direction in the rotational direction, W1 circumferential width of the first stator blade W2 ... The circumferential width of the second stator blade

Claims (16)

A motor having a rotor rotatable about a central axis extending in the vertical direction;
An impeller fixed to the rotor and rotatable with the rotor;
A motor housing disposed radially outward of the motor;
A blower case disposed radially outward of the motor housing;
And a plurality of circumferentially arranged stator blades disposed between the motor housing and the blower case.
The plurality of vanes include at least one first vane provided with a vane recess recessed from a surface of the vane,
The motor housing is provided with a communication hole communicating from the inside to the outside of the motor housing,
The air supply device according to claim 1, wherein the communication hole is provided between a front end portion in a rotational direction and a rear end portion in the rotational direction of the first stator blade, and communicates with the stator blade recess. The first vane is
A front wall located at the forward end in the direction of rotation;
A rear wall disposed at a rotational direction rear end;
Have
The front wall and the rear wall have an axial longitudinal direction,
The air blower according to claim 1, wherein the communication hole is provided circumferentially between the front wall and the rear wall. At the top of the first vane,
The air blower according to claim 2, wherein the rotational direction rear side surface of the rear wall portion is a curved surface directed downward in the axial direction as advancing in the rotational direction, and is recessed forward in the rotational direction and upward in the axial direction. At the top of the first vane,
The rotation direction front side surface of the front wall portion is a curved surface directed axially downward as it goes forward in the rotation direction, and protrudes forward in the rotation direction and axially upward. Blower. At the top of the first vane,
The air blower according to any one of claims 2 to 4, wherein a rotational direction rear side surface of the front wall extends in an axial direction.   The air blower according to any one of claims 2 to 4, wherein the upper end of the front wall is axially higher than the upper end of the rear wall. At the top of the first vane,
The air blower according to claim 6, wherein the rotational direction rear side surface of the front wall portion is a curved surface which is axially downwardly directed toward the rotational direction front, and is concaved forward in the rotational direction and axially upward. The front wall is part of the same member as one of the motor housing and the blower case,
The air blower according to any one of claims 2 to 7, wherein the rear wall portion is a part of the same member as the other of the motor housing and the blower case. The motor housing is
Upper motor housing,
A lower motor housing mounted axially below the upper motor housing;
Have
The front wall is a part of the same member as one of the upper motor housing and the lower motor housing,
The air blower according to any one of claims 2 to 7, wherein the rear wall portion is a part of the same member as the other of the upper motor housing and the lower motor housing.   The air blower according to any one of claims 2 to 9, wherein the first stationary blade further includes a connection wall connecting the lower end of the front wall and the lower end of the rear wall.   The air blower according to claim 10, wherein the upper surface of the connection wall portion is axially downwardly directed inward in the radial direction.   The circumferential width of the first stator vane is wider than the circumferential width of the second stator vane other than the first stator vane among the plurality of the stator vanes. Air blower.   The air blower according to any one of claims 1 to 12, wherein a circumferential side surface of the communication hole is forward in a rotational direction as it goes radially inward.   At least one of the lower surface of the motor housing at the axial upper edge portion of the communication hole and the upper surface of the motor housing at the axial lower edge portion of the communication hole extends axially downward as it goes radially inward. The air blower according to any one of claims 1 to 13, which is directed to.   The air blower according to any one of claims 1 to 14, wherein a plurality of the communication holes are provided at equal intervals in a circumferential direction.   A vacuum cleaner comprising the air blower according to any one of claims 1 to 15.

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