Air supply device and dust collector

Abstract

The invention relates to an air supply device and a dust collector. The blower device is provided with: an impeller capable of rotating about a central axis extending up and down; a motor that rotates the impeller; and a fan cover that covers the impeller from the outside in the radial direction. The impeller is provided with: a main plate fixed to the motor; the rotor includes a main plate, an upper plate disposed above the main plate, having an opening in a radial center portion thereof, and extending radially outward and obliquely downward from an edge portion of the opening, and a plurality of rotor blades disposed between the main plate and the upper plate in an axial direction and arranged at intervals from each other in a circumferential direction. The main plate is provided with: an impeller fixing part which is fixed to the motor; and an inclined portion extending obliquely downward from the impeller fixing portion toward the outside in the radial direction. At least the radially outward tip portion of the inclined portion is inclined linearly obliquely downward toward the radially outward direction.

Description

Technical Field

[0001] The invention relates to an air supply device and a dust collector. Background Art

[0002] The vacuum cleaner includes an air blower. When the air blower is driven, a fluid containing dust and the like is sucked into the vacuum cleaner (see, for example, Patent Document 1). Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-38027 Summary of the Invention

[0004] The air supply device includes an impeller. The impeller rotates to draw in fluid and causes the fluid to flow radially outward. In this structure, if the pressure loss of the fluid flowing out of the impeller is large, the air supply efficiency may be reduced.

[0005] The purpose of the present invention is to improve the air supply efficiency of an air supply device.

[0006] An exemplary air supply device of the present invention comprises: an impeller rotatable about a central axis extending vertically; a motor that rotates the impeller; and a fan cover that covers the impeller from the radially outward side. The impeller comprises: a main plate fixed to the motor; an upper plate disposed above the main plate, having an opening in a radially central portion and extending radially outward and obliquely downward from the edge of the opening; and a plurality of moving blades disposed axially between the main plate and the upper plate and arranged at intervals in the circumferential direction. The main plate comprises: an impeller fixing portion fixed to the motor; and an inclined portion extending radially outward and obliquely downward from the impeller fixing portion. At least the radially outward front end portion of the inclined portion is linearly inclined radially outward and obliquely downward.

[0007] An exemplary vacuum cleaner according to the present invention includes the above-described air blowing device.

[0008] According to the exemplary air supply device and vacuum cleaner of the present invention, the air supply efficiency of the air supply device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a perspective view of the air blowing device according to the embodiment. Figure 2 This is a perspective view of an impeller of the air blowing device according to the embodiment. Figure 3 It is a cross-sectional perspective view of the air blowing device according to the embodiment. Figure 4 It is a diagram showing a flow path of a fluid sucked in and discharged by the air blowing device according to the embodiment. Figure 5 It is an exploded perspective view of each member constituting a flow path of a fluid sucked in and discharged by the air blowing device according to the embodiment. Figure 6 This is a cross-sectional view of an impeller of the air blowing device according to the embodiment. Figure 7 This is a perspective view of a vacuum cleaner equipped with the air blowing device according to the embodiment. DETAILED DESCRIPTION

[0010] Below, refer to the attached Figures 1 to 7 , exemplary embodiments of the present invention are described.

[0011] In this specification, the direction in which the central axis CA of the air supply device 10 extends is referred to as the "axial direction," and the circumferential direction centered on the central axis CA is referred to as the "circumferential direction." Furthermore, the direction perpendicular to the central axis CA is referred to as the "radial direction." The direction radially approaching the central axis CA is referred to as the "radially inward direction," and the direction radially away from the central axis CA is referred to as the "radially outward direction."

[0012] In this specification, for convenience, the axial direction is defined as the vertical direction, and the side where the impeller 1 is disposed is described as the upper side of the air blower 10. However, the definition of the vertical direction does not limit the actual orientation and positional relationship of the components of the air blower 10.

[0013] <1. Overall structure of the air supply unit> Figure 1 It is a perspective view of the air blowing device 10 according to the embodiment. Figure 2 It is a perspective view of the impeller 1 of the air blowing device 10 according to the embodiment. Figure 3 It is a cross-sectional perspective view of the air blowing device 10 according to the embodiment. Figure 4 1 is a diagram showing a flow path of the fluid F sucked in and discharged by the air blowing device 10 according to the embodiment. Figure 5 It is an exploded perspective view of each member constituting a flow path of the fluid F sucked in and discharged by the air blowing device 10 according to the embodiment.

[0014] The air blowing device 10 of this embodiment has a suction port 10A opened upward. In addition, the air blowing device 10 has an exhaust port 10B opened downward.

[0015] The air supply device 10 sucks a fluid F from a suction port 10A and discharges the fluid F from a discharge port 10B. The fluid F is, for example, a gas such as air. The fluid F may contain dust or the like. Figure 4 In FIG. 1 , the flow of the fluid F inside the air supply device 10 is shown by dotted arrows.

[0016] The air supply device 10 includes an impeller 1. The impeller 1 is rotatable about a central axis CA extending vertically. The impeller 1 generates airflow by rotating. The impeller 1 is made of metal such as aluminum. Alternatively, the impeller 1 may be made of resin. The impeller 1 has the following features: Figure 2 The structure of the impeller 1 is described in detail below.

[0017] The air blowing device 10 includes a motor 2. The motor 2 rotates the impeller 1. The motor 2 is a brushless motor.

[0018] The air supply device 10 includes a fan cover 3. The fan cover 3 covers the impeller 1 from the radially outer side. Specifically, the fan cover 3 is dome-shaped and convex upward. The impeller 1 is arranged radially inward of the dome of the fan cover 3. The fan cover 3 also has an opening serving as a suction port 10A at its radial center.

[0019] Thus, the impeller 1 is rotated by the drive of the motor 2, sucking the fluid F from the suction port 10A. The fluid F sucked by the impeller 1 flows radially outward from the impeller 1. Furthermore, the fluid F flowing radially outward from the impeller 1 hits the inner wall of the fan cover 3 and is guided downward toward the discharge port 10B.

[0020] The air supply device 10 includes a diffuser 4. The diffuser 4 has a plurality of stator blades 40. The plurality of stator blades 40 are arranged in the flow path of the fluid F flowing out of the impeller 1. The plurality of stator blades 40 are arranged at intervals in the circumferential direction. The fluid F flowing downward from the impeller 1 is rectified by the diffuser 4 (specifically, the plurality of stator blades 40) and discharged from the discharge port 10B.

[0021] The motor 2 includes a rotor 21 and a stator 22. The rotor 21 is rotatable about a central axis CA. The stator 22 is disposed radially outward from the rotor 21 and rotates the rotor 21. That is, the motor 2 is an inner rotor type.

[0022] The rotor 21 has a shaft 211. The shaft 211 extends along the central axis CA. The shaft 211 is rotatably supported. Specifically, the rotor 21 has an upper bearing Br1. The upper bearing Br1 rotatably supports the shaft 211 above the stator 22. Furthermore, the rotor 21 has a lower bearing Br2. The lower bearing Br2 rotatably supports the shaft 211 below the stator 22. The radially outer surface of the shaft 211 is fixed to the radially inner surface of the inner rings of the upper bearing Br1 and the lower bearing Br2. Thus, the shaft 211 can rotate about the central axis CA.

[0023] The shaft 211 extends above the upper bearing Br1 , and the impeller 1 is fixed to a portion of the shaft 211 above the upper bearing Br1 . Thus, the shaft 211 rotates, causing the impeller 1 to rotate together with the shaft 211 .

[0024] The rotor 21 includes a rotor magnet 212. The rotor magnet 212 is fixed to the radially outer side of the shaft 211. The rotor magnet 212 is disposed axially between the upper bearing Br1 and the lower bearing Br2. The rotor magnet 212 has N poles and S poles alternately arranged in the circumferential direction.

[0025] The stator 22 includes a stator core 221, an insulator 222, and coils 223. The stator 22 includes coils 223 of multiple phases (three phases: U phase, V phase, and W phase).

[0026] The stator core 221 is an annular magnetic body centered on the central axis CA and is a laminated body formed by stacking multiple electromagnetic steel plates in the axial direction. The stator core 221 is arranged radially outward from the rotor magnet 212. The stator core 221 faces the rotor magnet 212 with a gap in the radial direction.

[0027] The insulator 222 is an insulating member formed of a resin, etc. The insulator 222 covers at least a portion of the stator core 221. The coil 223 is formed by winding a conductive wire around the stator core 221 via the insulator 222.

[0028] The stator 22 includes a terminal pin TP. The terminal pin TP is electrically connected to the coil 223. The terminal pin TP is fixed to the insulator 222. The terminal pin TP protrudes downward from the insulator 222.

[0029] The motor 2 includes an upper housing 23. The upper housing 23 includes an upper bearing opening 23a at a radially central portion thereof. The upper bearing Br1 is disposed and held in the upper bearing opening 23a.

[0030] Specifically, the upper housing 23 has a housing upper portion 231. The housing upper portion 231 is located above the stator 22. The housing upper portion 231 has an upper bearing opening 23a extending axially through the radial center. The upper bearing opening 23a is circular centered on the central axis CA.

[0031] The shaft 211 protrudes through the upper bearing opening 23a to a position above the upper casing 23. The impeller 1 is fixed to a portion of the shaft 211 that protrudes to a position above the upper casing 23.

[0032] The upper housing 23 also includes an upper bearing retaining portion 232. The upper bearing retaining portion 232 is cylindrical, centered on the central axis CA. The upper bearing retaining portion 232 is positioned within the upper bearing opening 23a. The outer ring of the upper bearing Br1 is fixed to the radially inner surface of the upper bearing retaining portion 232. Thus, the upper bearing retaining portion 232 retains the upper bearing Br1.

[0033] The housing upper portion 231 and the upper bearing holding portion 232 are separate components, but the radially outer side of the upper bearing holding portion 232 is fixed to the radially inner side of the upper bearing opening 23a.

[0034] The upper housing 23 includes an inner cylindrical portion 233 and an outer cylindrical portion 234. Each of the inner cylindrical portion 233 and the outer cylindrical portion 234 is cylindrical in shape, centered on the central axis CA. The inner cylindrical portion 233 is positioned radially inward of the outer cylindrical portion 234. The stator 22 is positioned radially inward of the inner cylindrical portion 233. The stator 22 is fixed to the radially inner side of the inner cylindrical portion 233.

[0035] The inner cylindrical portion 233 and the outer cylindrical portion 234 are arranged radially spaced apart from each other. A plurality of ribs 230 are arranged circumferentially spaced apart between the radial directions of the inner cylindrical portion 233 and the outer cylindrical portion 234. The inner cylindrical portion 233 and the outer cylindrical portion 234 are connected to each other via the plurality of ribs 230. The radial direction between the inner cylindrical portion 233 and the outer cylindrical portion 234 forms a flow path for the fluid F. The plurality of ribs 230 each function as a stator blade.

[0036] The housing upper portion 231 is connected to the inner cylindrical portion 233 . The inner cylindrical portion 233 has high heat dissipation properties due to being exposed to the fluid F. That is, the housing upper portion 231 is connected to a portion of the upper housing 23 having high heat dissipation properties.

[0037] Here, the housing upper portion 231 is made of resin. Meanwhile, the upper bearing retaining portion 232 is made of a material with higher thermal conductivity than the housing upper portion 231. In other words, the upper bearing retaining portion 232 is made of a different material than the housing upper portion 231. For example, the upper bearing retaining portion 232 is made of metal. The metal material of the upper bearing retaining portion 232 is not particularly limited and can be aluminum or stainless steel.

[0038] If all parts of the upper housing 23, including the housing upper portion 231 and the upper bearing holding portion 232, are made of metal, heat dissipation is improved, but this leads to increased costs. On the other hand, if all parts of the upper housing 23, including the housing upper portion 231 and the upper bearing holding portion 232, are made of resin, the cost can be reduced, but heat dissipation is reduced.

[0039] Therefore, in this embodiment, upper bearing retaining portion 232 is constructed from a material (i.e., metal) with higher thermal conductivity than upper housing portion 231. In upper housing 23, only upper bearing retaining portion 232 is constructed from metal, while the remaining portions are constructed from resin. This effectively dissipates heat generated by upper bearing Br1 and its surroundings while minimizing cost increases.

[0040] In addition to the upper housing 23, the motor 2 also includes a lower housing 24. The lower housing 24 is a separate member from the upper housing 23. The lower housing 24 has a lower bearing opening (not shown) in the radial center. The lower bearing Br2 is disposed and held in the lower bearing opening.

[0041] Specifically, the lower housing 24 includes a housing lower portion 241. The housing lower portion 241 is located below the stator 22. The housing lower portion 241 includes an opening extending through the housing in the axial direction at a radially central portion thereof as a lower bearing opening.

[0042] The lower housing 24 also includes a lower bearing retaining portion 242. The lower bearing retaining portion 242 is disposed in the lower bearing opening. The outer ring of the lower bearing Br2 is fixed to the radially inner surface of the lower bearing retaining portion 242. Thus, the lower bearing retaining portion 242 retains the lower bearing Br2.

[0043] A circuit board 25 is disposed below the lower case 24. The stator 22 is electrically connected to the circuit board 25 via terminal pins TP. The stator 22 receives power from the circuit board 25. This supplies power to the coil 223.

[0044] <2. Detailed structure of impeller> Figure 6 It is a cross-sectional view of the impeller 1 of the air blowing device 10 according to the embodiment. Figure 6 In FIG, the flow of the fluid F sucked in and discharged by the impeller 1 is shown by the dotted arrows.

[0045] <2-1. Motherboard shape> The impeller 1 has a main plate 11. The main plate 11 is a base of the impeller 1. The main plate 11 has a disk shape centered on the central axis CA.

[0046] The main plate 11 has an impeller fixing portion 111. The impeller fixing portion 111 is the radially central portion of the main plate 11. The impeller fixing portion 111 is fixed to the motor 2. Specifically, the upper end portion of the shaft 211 passes through the impeller fixing portion 111 in the axial direction. A pair of fixing members 1110 (see FIG. 1 ) are fixed to the upper end portion of the shaft 211 so as to sandwich the impeller fixing portion 111 in the axial direction. Figure 3 A pair of fixing members 1110 sandwich the impeller fixing portion 111 in the axial direction, thereby fixing the upper end of the shaft 211 to the main plate 11. In other words, the main plate 11 is fixed to the motor 2. As a result, the impeller 1 rotates together with the shaft 211 when driven by the motor 2.

[0047] The impeller 1 includes an upper plate 12 . The upper plate 12 is positioned above the main plate 11 . The upper plate 12 has an opening 12A at its radial center. The opening 12A is circular, centered on the central axis CA, and extends axially through the upper plate 12. The opening 12A axially overlaps the suction port 10A.

[0048] The upper plate 12 extends radially outward and obliquely downward from the edge of the opening 12A. Furthermore, the upper plate 12 has a shape whose inclination relative to a direction perpendicular to the axial direction gradually decreases as it moves radially outward. Specifically, the upper plate 12 curves convexly toward the radial inward direction. Thus, the inclination of the upper plate 12 relative to a direction perpendicular to the axial direction gradually decreases as it moves radially outward.

[0049] The impeller 1 has a plurality of moving blades 13. The plurality of moving blades 13 are arranged in the axial direction between the main plate 11 and the upper plate 12. The plurality of moving blades 13 are arranged at intervals from each other in the circumferential direction.

[0050] Each rotor blade 13 is fixed to the main plate 11 by caulking. Furthermore, each rotor blade 13 is fixed to the upper plate 12 by caulking. The method for fixing each rotor blade 13 to the main plate 11 and the method for fixing each rotor blade 13 to the upper plate 12 are not particularly limited. Various fixing methods can be used, such as welding, bonding, and press-fitting.

[0051] As the impeller 1 rotates, it draws fluid F through opening 12A. This fluid F reaches the axial space between the main plate 11 and the upper plate 12. The impeller 1 then causes the fluid F to flow radially outward from the circumferential spaces between the plurality of rotor blades 13. As a result, the fluid F flowing radially outward from the impeller 1 strikes the inner wall of the fan cover 3 and is guided downward.

[0052] In this embodiment, the main plate 11 has an inclined portion 112. The inclined portion 112 is a portion of the main plate 11 that extends radially outward from the impeller fixing portion 111. Furthermore, the impeller fixing portion 111 extends parallel to a direction perpendicular to the axial direction. Furthermore, the inclined portion 112 extends radially outward and diagonally downward from the impeller fixing portion 111. At least the radially outward front end 112a of the inclined portion 112 is linearly inclined radially outward and diagonally downward.

[0053] Thus, in this embodiment, fluid F drawn through opening 12A of impeller 1 flows radially outward and obliquely downward, and this fluid F flows out radially outward and obliquely downward from the axial direction between main plate 11 and upper plate 12 of impeller 1. Here, fan cover 3 is positioned radially outward of impeller 1. Therefore, the flow of fluid F flowing radially outward from impeller 1 generates pressure loss. However, by causing fluid F to flow radially outward and obliquely downward from impeller 1, the pressure loss of fluid F can be reduced. As a result, the air supply efficiency of air supply device 10 can be improved.

[0054] Furthermore, in this embodiment, the inclined portion 112 slopes linearly and radially outward and obliquely downward from the boundary with the impeller fixing portion 111 to the tip 112a. That is, the inclined portion 112, including the tip 112a, slopes radially outward and obliquely downward without any curve. This further reduces the pressure loss of the fluid F flowing radially outward and obliquely downward between the main plate 11 and the upper plate 12 in the axial direction.

[0055] As a modified example, a curved portion may exist between the boundary with the impeller fixing portion 111 and the tip 112a of the inclined portion 112. In other words, at least the tip 112a of the inclined portion 112 may be linearly inclined radially outward and downward.

[0056] <2-2. Thickness of Main and Upper Plates> In this embodiment, the thickness of the upper plate 12 is greater than the thickness of the main plate 11. For example, the thickness of the upper plate 12 is greater than the thickness of the main plate 11.

[0057] This structure improves the strength of the upper plate 12. As a result, it is possible to suppress damage to the fixing portion between the upper plate 12 and each rotor blade 13 due to centrifugal force.

[0058] Alternatively, the thickness of the upper plate 12 may be the same as that of the main plate 11. When the main plate 11 and the upper plate 12 have the same thickness, the impeller 1 can be made lighter than when the upper plate 12 is thicker than the main plate 11. However, the thicker the upper plate 12, the higher its strength, which can prevent damage to the fixing portion between the upper plate 12 and the rotor blades 13.

[0059] <2-3. Tilt angles of the main and upper panels> In this embodiment, the upper plate 12 is tilted more than the inclined portion 112 relative to the direction perpendicular to the axial direction. In other words, the axial width between the main plate 11 and the upper plate 12 gradually decreases radially outward. In other words, the axial width of the flow path of the fluid F passing through the impeller 1 gradually decreases radially outward.

[0060] In this structure, the fluid F is compressed radially outward between the main plate 11 and the upper plate 12 in the axial direction. As a result, the fluid F flowing out of the impeller 1 tends to flow obliquely downward.

[0061] <2-4. Positional Relationship between Impeller and Upper Bearing> In this embodiment, the impeller fixing portion 111 is fixed to a portion of the shaft 211 above the upper bearing Br1. Furthermore, at least a portion of the upper bearing Br1 is positioned so as to radially overlap the inclined portion 112. Specifically, at least a portion of the upper bearing Br1 is positioned radially inward of the dome formed by the impeller fixing portion 111 and the inclined portion 112.

[0062] Here, the larger the distance between the center of gravity of the impeller 1 and the axial direction of the upper bearing Br1, the greater the wobble of the shaft 211 caused by the rotation of the impeller 1, and the more likely it is to generate vibration and noise. Therefore, it is preferable to minimize the distance between the center of gravity of the impeller 1 and the axial direction of the upper bearing Br1.

[0063] Therefore, in this embodiment, at least a portion of the upper bearing Br1 is positioned radially inward of the dome formed by the impeller fixing portion 111 and the inclined portion 112. This reduces the distance between the center of gravity of the impeller 1 and the axial direction of the upper bearing Br1. Consequently, vibration and noise caused by the rotation of the impeller 1 can be suppressed.

[0064] <2-5. Positional Relationship between Impeller and Diffuser> The diffuser 4 is fixed to the upper shell 23. Specifically, Figure 5 As shown, the diffuser 4 has a diffuser fixing portion 41. Furthermore, the diffuser fixing portion 41 is fixed to the housing upper portion 231.

[0065] The diffuser 4 also includes an inner diffuser tube portion 42 and an outer diffuser tube portion 43. The inner diffuser tube portion 42 extends downward in a cylindrical shape from the radially outer edge of the diffuser fixing portion 41. The outer diffuser tube portion 43 is arranged radially outward of the inner diffuser tube portion 42 at intervals. The stationary blades 40 are arranged radially between the inner diffuser tube portion 42 and the outer diffuser tube portion 43, connecting the inner diffuser tube portion 42 and the outer diffuser tube portion 43.

[0066] In this embodiment, at least a portion of the diffuser fixing portion 41 is disposed radially overlapping the inclined portion 112. That is, a portion of the diffuser fixing portion 41 is disposed radially inward of the dome formed by the impeller fixing portion 111 and the inclined portion 112.

[0067] In this structure, the arrangement area of ​​the impeller 1 and the arrangement area of ​​the diffuser 4 partially overlap in the axial direction. This allows the air blowing device 10 to be miniaturized in the axial direction.

[0068] <3. Usage Examples> Figure 7 It is a perspective view of the vacuum cleaner 100 according to the embodiment.

[0069] The vacuum cleaner 100 includes an air blowing device 10. The air blowing device 10 is attached to the vacuum cleaner 100 and sucks air.

[0070] The blower 10 generates airflow by being driven. Air containing dust and the like is sucked into the cleaner 100 by the blower 10. In the cleaner 100 equipped with the blower 10, air supply efficiency is improved, thereby suppressing the occurrence of abnormalities such as suction failure.

[0071] In addition, the air blowing device 10 can be mounted on various types of vacuum cleaners 100 , such as a stick type, a robot type, a canister type, and a handheld type. Figure 7 , a stick cleaner 100 is shown as an example.

[0072] For example, the vacuum cleaner 100 is a dry type. However, the invention is not limited thereto and the vacuum cleaner 100 may also be a wet and dry type.

[0073] <4. Other> The above describes the embodiments of the present invention. The scope of the present invention is not limited to the above embodiments. The present invention can be implemented with various modifications without departing from the spirit of the invention. Furthermore, the above embodiments can be appropriately combined in any desired manner.

[0074] The present invention can adopt the following structures (1) to (8).

[0075] (1) An air supply device comprising: an impeller rotatable about a central axis extending vertically; a motor that rotates the impeller; and a fan cover, the fan cover covering the impeller from the radial outside, The impeller has: a mainboard, the mainboard being fixed to the motor; an upper plate, the upper plate being arranged above the main plate, having an opening in a radial center portion, and extending radially outward and obliquely downward from an edge of the opening; and A plurality of moving blades are arranged between the main plate and the upper plate in the axial direction and spaced apart from each other in the circumferential direction. The mainboard has: an impeller fixing portion fixed to the motor; and An inclined portion extending radially outward and obliquely downward from the impeller fixing portion. At least a radially outer front end portion of the inclined portion is linearly inclined radially outward and obliquely downward.

[0076] (2) In the air blowing device described in (1), the inclined portion is linearly inclined downward and radially outward from the boundary with the impeller fixing portion to the front end portion.

[0077] (3) In the air supply device described in (1) or (2), the thickness of the upper plate is greater than or equal to the thickness of the main plate.

[0078] (4) In the air supply device described in any one of (1) to (3), the upper plate is more inclined with respect to a direction perpendicular to the axial direction than the inclined portion.

[0079] (5) In the air supply device described in any one of (1) to (4), the motor has: a rotor rotatable about the central axis; and a stator, the stator being arranged radially outward from the rotor and causing the rotor to rotate, The rotor has: a shaft extending along the central axis; and an upper bearing rotatably supporting the shaft on an upper side of the stator, The impeller fixing portion is fixed to the shaft at a portion of the shaft above the upper bearing. At least a portion of the upper bearing is disposed at a position overlapping the inclined portion in the radial direction.

[0080] (6) The air supply device according to any one of (1) to (5), comprising: a rotor rotatable about the central axis; a stator disposed radially outward from the rotor and configured to rotate the rotor; and Upper shell, The rotor has: a shaft extending along the central axis; and an upper bearing rotatably supporting the shaft on an upper side of the stator, The upper housing has: a housing upper portion, the housing upper portion being located above the stator and having an upper bearing opening extending therethrough in the axial direction at a radial center portion; and an upper bearing holding portion, the upper bearing holding portion being arranged in the upper bearing opening and holding the upper bearing, The housing upper portion and the upper bearing holding portion are connected to each other, The upper part of the housing is made of resin. The upper bearing holding portion is formed of a material having higher thermal conductivity than the housing upper portion.

[0081] (7) The air supply device according to any one of (1) to (6) further comprises a diffuser having a plurality of stationary blades arranged on a flow path of the fluid flowing out of the impeller. The motor has: a rotor, the rotor being rotatable about the central axis; a stator disposed radially outward from the rotor and configured to rotate the rotor; and Upper shell, The upper housing has an upper housing portion located above the stator. The diffuser has a diffuser fixing portion fixed to the upper portion of the housing. At least a portion of the diffuser fixing portion is disposed at a position overlapping with the inclined portion in a radial direction.

[0082] (8) A vacuum cleaner comprising the air supply device according to any one of (1) to (7). Industrial applicability

[0083] The present invention can be used, for example, in an air supply device mounted on a vacuum cleaner or the like. Explanation of symbols

[0084] 1 impeller 2 motors 3 Fan cover 4 Diffuser 10 Air supply device 11 Motherboard 12 on board 12A opening 13 moving blades 21 rotors 22 stator 23 upper shell 23a Upper bearing opening 40 stator blades 41 Diffuser fixing part 100 vacuum cleaners 111 impeller fixing part 112 inclined portion 112a front end 211 axis 231 upper shell 232 upper bearing retaining part Br1 upper bearing CA central axis F fluid.

Claims

1. An air supply device, characterized in that: have: An impeller, the impeller being rotatable about a central axis extending vertically; a motor that rotates the impeller; and a fan cover, the fan cover covering the impeller from the radial outside, The impeller has: a mainboard, the mainboard being fixed to the motor; an upper plate, the upper plate being arranged above the main plate, having an opening in a radial center portion, and extending radially outward and obliquely downward from an edge of the opening; and A plurality of moving blades are arranged between the main plate and the upper plate in the axial direction and spaced apart from each other in the circumferential direction. The mainboard has: an impeller fixing portion, the impeller fixing portion being fixed to the motor; as well as An inclined portion extending radially outward and obliquely downward from the impeller fixing portion. At least a radially outer front end portion of the inclined portion is linearly inclined radially outward and obliquely downward.

2. The air supply device according to claim 1, characterized in that: The inclined portion is linearly inclined radially outward and obliquely downward from the boundary with the impeller fixing portion to the front end portion.

3. The air supply device according to claim 1, characterized in that: The thickness of the upper plate is greater than that of the main plate.

4. The air supply device according to claim 1, wherein: The upper plate is more inclined than the inclined portion with respect to a direction perpendicular to the axial direction.

5. The air supply device according to claim 1, characterized in that: The motor has: a rotor rotatable about the central axis; and a stator, the stator being arranged radially outward from the rotor and causing the rotor to rotate, The rotor has: a shaft extending along the central axis; as well as an upper bearing rotatably supporting the shaft on an upper side of the stator, The impeller fixing portion is fixed to a portion of the shaft above the upper bearing. At least a portion of the upper bearing is disposed at a position overlapping the inclined portion in the radial direction.

6. The air supply device according to claim 1, wherein: The motor has: a rotor, the rotor being rotatable about the central axis; a stator, the stator being arranged radially outward from the rotor and causing the rotor to rotate; as well as Upper shell, The rotor has: a shaft extending along the central axis; as well as an upper bearing rotatably supporting the shaft on an upper side of the stator, The upper housing has: an upper portion of the housing, the upper portion of the housing being located above the stator and having an upper bearing opening extending therethrough in the axial direction at a radial center portion; as well as an upper bearing holding portion, the upper bearing holding portion being arranged in the upper bearing opening and holding the upper bearing, The housing upper portion and the upper bearing holding portion are connected to each other, The upper part of the housing is made of resin. The upper bearing holding portion is formed of a material having higher thermal conductivity than the housing upper portion.

7. The air supply device according to claim 1, characterized in that: A diffuser having a plurality of stationary blades arranged on a flow path of the fluid flowing out of the impeller is provided. The motor has: a rotor, the rotor being rotatable about the central axis; a stator disposed radially outward from the rotor and configured to rotate the rotor; and Upper shell, The upper housing has an upper housing portion located above the stator. The diffuser has a diffuser fixing portion fixed to the upper portion of the housing. At least a portion of the diffuser fixing portion is disposed at a position overlapping the inclined portion in a radial direction.

8. A vacuum cleaner, characterized in that: A ventilation device according to any one of claims 1 to 7 is provided.

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