JP6585873B2 - Blower and vacuum cleaner - Google Patents

Description

  The present invention relates to an electric blower. The blower is mounted on a vacuum cleaner, for example.

A static pressure is required for the blower mounted on the vacuum cleaner. As such an air blower, there exist some which were disclosed by Unexamined-Japanese-Patent No. 2010-281232 and Unexamined-Japanese-Patent No. 2011-80427, for example. In these air blowers, an air guide that guides the flow of air from the side of the impeller downward is provided. Air is sucked from the center of the impeller and sent to the side of the impeller. The air is guided to the periphery of the motor located below through the air guide.
JP 2010-281232 A JP 2011-80427 A

  By the way, when the air guide is provided on the side of the impeller, noise is generated between the impeller and the air guide when the impeller rotates at a high speed. Noise reduction is particularly important when the blower is used in consumer products such as vacuum cleaners. On the other hand, depending on the position of the blower in the device and the surrounding structure, it may be required to reduce the size of the blower in the radial direction. However, when the air guide is located on the side of the impeller, it is difficult to reduce the size of the blower.

  An object of the present invention is to reduce noise while maintaining a static pressure in a blower and further reduce the size in the radial direction.

An air blower according to an exemplary embodiment of the present invention includes a motor unit whose central axis is directed in the vertical direction, and is positioned above the motor unit, connected to the rotating unit of the motor unit, and rotated. An impeller that sucks air from above and delivers gas radially outward or radially outward and downward, and an inner peripheral surface that covers the outer periphery and the outer edge of the impeller, and intake air at the center A body cover that covers the outer periphery of the upper cover and the outer periphery of the motor unit and forms a cylindrical space between the outer peripheral surface of the motor cover that is the outer periphery of the motor unit; A lower annular portion that is perpendicular to the central axis and annular, and an exhaust port that is positioned below the lower annular portion . The cylindrical space is located below the lower end portion of the outer edge portion of the impeller, and is located below the first cylindrical space and a first cylindrical space configured as a single gas flow path. And a second cylindrical space having a plurality of gas flow paths arranged in the direction. Channel inlets of the plurality of gas channels are located below a virtual extension line connecting the lower end of the inner diameter of the intake port and the lower end of the outer periphery of the impeller, and the motor part and the lower annular part A plurality of lower gas flow paths extending radially inward from the lower ends of the plurality of gas flow paths are provided in the space between, and the top surfaces of the plurality of lower gas flow paths are formed on the circuit board of the motor unit. It is the bottom surface.

A blower according to another exemplary embodiment of the present invention includes a motor unit whose central axis is directed in the vertical direction, and is positioned above the motor unit, connected to the rotating unit of the motor unit, and rotated. An impeller that sucks in air from above and sends gas radially outward or radially outward and downward; and an upper cover that covers the outer periphery and the outer edge of the impeller and has an air inlet in the center A body cover that covers the outer periphery of the motor part, and an intermediate member that includes an annular part that is positioned between the impeller and the motor part in the axial direction and surrounds the central axis. The annular portion is located below the outer edge or the outer periphery of the impeller, and has a guide groove that is recessed downward and extends in the circumferential direction, and the annular portion has a gas from the impeller in the guide groove. and have a plurality of supply hole leading to the cylindrical space between the body cover and the motor unit, the guide grooves are present over the entire circumference of the annular portion, of the outer edge of the impeller A lower end is located in the guide groove.

  The present invention is also directed to a vacuum cleaner provided with a blower.

  According to the present invention, it is possible to reduce noise while maintaining the static pressure of the blower, and further reduce the size in the radial direction.

FIG. 1 is a diagram illustrating a vacuum cleaner. FIG. 2 is a perspective view of the blower. FIG. 3 is a longitudinal sectional view of the blower. FIG. A is a perspective view of the upper impeller as viewed obliquely from above. FIG. B is a perspective view of the upper impeller as viewed obliquely from below. FIG. A is a perspective view of the main body cover as viewed obliquely from above. FIG. B is a perspective view of the main body cover as viewed obliquely from below. FIG. A is the perspective view which looked at the diffuser from diagonally upward. FIG. B is a perspective view of the diffuser as viewed obliquely from below. FIG. 7 is a view for explaining the position in the axial direction of the flow path inlet of the air flow path. FIG. 8 is a front view of another blower. FIG. 9 is a longitudinal sectional view of another blower. FIG. A is a perspective view of the intermediate member as viewed obliquely from above. FIG. B is a plan view of the intermediate member. FIG. 11 is a longitudinal sectional view of the air supply holes.

  In this specification, the upper side in the direction of the central axis J1 in FIG. 3 of the motor unit of the blower is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”. Note that the vertical direction is determined for convenience of description and does not need to coincide with the direction of gravity. A direction parallel to or substantially parallel to the central axis J1 is referred to as an “axial direction”, a radial direction centered on the central axis J1 is simply referred to as a “radial direction”, and a circumferential direction centered on the central axis J1 It is simply called “circumferential direction”.

  FIG. 1 is a diagram showing a cleaner 8 including a blower device 1 according to an exemplary embodiment of the present invention. The appearance of the vacuum cleaner 8 is indicated by a two-dot chain line.

  The vacuum cleaner 8 includes a suction pipe 81 and a main body 82. The main body 82 includes the blower 1. A suction brush (not shown) is attached to the tip of the suction tube 81. A dust collection chamber 821 and an exhaust space 822 are provided in the main body 82. The dust collection chamber 821 is connected to the suction pipe 81. The blower 1 is connected to the dust collection chamber 821 and the exhaust space 822.

  FIG. 2 is a perspective view of the blower 1. The blower 1 has a substantially cylindrical shape. The blower device 1 includes an intake port 113 and a plurality of exhaust ports 142. The air inlet 113 is located in the upper center. The flow path of the suction pipe 81 is connected to the intake port 54 via the dust collection chamber 821. The exhaust ports 142 are arranged in the circumferential direction below the outer peripheral surface. Exhaust gas from the exhaust port 142 is discharged from the exhaust space 822 to the outside of the main body 82.

  FIG. 3 is a longitudinal sectional view of the blower 1. Parallel oblique lines are omitted for details of the cross section. The same applies to the following drawings. The blower device 1 includes an upper cover 11, a main body cover 12, a diffuser 13, and a lower cover 14. In the blower 1, an internal space is configured by these components. The blower device 1 further includes an upper impeller 15a, a motor unit 16, and a lower impeller 15b in the internal space.

  The upper cover 11 includes an outer peripheral portion 111 that covers the outer periphery of the upper impeller 15a, and an upper portion 112 that covers the upper portion of the outer edge portion of the upper impeller 15a. The upper cover 11 includes an air inlet 113 at the center of the upper portion 112. The upper portion 112 is inclined so as to go upward inward in the radial direction. The outer peripheral portion 111 extends downward from the outer peripheral portion of the upper portion 112. The upper part 112 and the outer peripheral part 111 are connected by a smooth curved surface. The inner peripheral surface of the upper cover 11 covers the outer periphery and the upper edge of the upper impeller 15a.

  The upper impeller 15 a is located above the motor unit 16. The upper impeller 15a is connected to the rotating part of the motor part 16 and rotates around the central axis J1. As the upper impeller 15a rotates, intake is performed from above through the intake port 113. Air is sent out radially outward by the upper impeller 15a. The upper impeller 15a may send out air radially outward and downward like a mixed flow fan. Since the outer periphery and upper part of the upper impeller 15a are covered with the upper cover 11, the air flows downward on the inner periphery of the upper cover 11. In particular, since the upper portion 112 and the outer peripheral portion 111 of the upper cover 11 are smoothly connected, the air is efficiently guided downward.

  FIG. A is a perspective view of the upper impeller 15a as viewed obliquely from above. FIG. B is a perspective view of the upper impeller 15a as viewed obliquely from below. The upper impeller 15 a includes a base portion 151, a plurality of blades 152, and a blade connecting portion 153. The base portion 151 is a disc perpendicular to the central axis J1. The plurality of blades 152 are disposed on the upper surface of the base portion 151. The plurality of wings 152 are arranged in the circumferential direction.

  Each wing 152 protrudes upward from the upper surface of the base portion 151, and extends radially outward from the center of the base portion 151. The upper edge of each wing 152 goes downward as it goes radially outward. Each blade 152 extends outward in the radial direction of the base portion 151. The outer edge portion 154 outside the base portion 151 of each wing 152 extends below the base portion 151. The blade connecting portion 153 connects the upper ends of the outer edge portions 154 in the circumferential direction.

  The motor unit 16 includes a rotating unit 31, a stationary unit 32, and a pair of bearings 33. The rotating part 31 includes a shaft 311, a magnet support part 312, and a rotor magnet 313. The shaft 311 is disposed around the central axis J1. The upper end of the shaft 311 is connected to the center of the base portion 151 of the upper impeller 15a. The rotor magnet 313 is indirectly fixed to the shaft 311 via the magnet support portion 312. The rotor magnet 313 has a plurality of magnetic poles in the circumferential direction.

  The stationary part 32 includes a motor cover 321, a stator 322, a pair of bearing holding parts 323, and a circuit board 324. The motor cover 321 is substantially cylindrical. The outer peripheral surface of the motor cover 321 is the outer peripheral surface of the motor unit 16. The stator 322 is fixed to the inner peripheral surface of the motor cover 321. In the stator 322, the tips of the teeth face inward in the radial direction and face the rotor magnet 313. The bearing holding portions 323 are located at the upper and lower portions of the motor cover 321. The bearing 33 is held by the bearing holding portion 323. The shaft 311 is supported by the stationary portion 32 via the bearing 33 so as to be rotatable about the central axis J1. The circuit board 324 is located below the stator 322. The circuit board 324 is annular or substantially arc-shaped and has a plate shape perpendicular to the central axis J1. The circuit board 324 is located on the radially outer side of the lower bearing holding portion 323.

  The main body cover 12 is substantially cylindrical. The main body cover 12 covers the outer periphery of the motor unit 16. The upper end of the main body cover 12 is connected to the lower end of the upper cover 11. The upper end of the main body cover 12 faces the base portion 151 of the upper impeller 15a in the radial direction. A cylindrical space 71 is formed between the motor unit 16 and the main body cover 12. A lower portion of the outer edge portion 154 of the wing 152 is located in the cylindrical space 71. In the blower 1, the cylindrical space 71 is cylindrical, but is not limited to a cylindrical shape, and the diameter may not be constant in the axial direction. However, in the blower device 1, the outer diameter of the upper impeller 15 a is made smaller than the outer diameter of the cylindrical space 71 in order to achieve downsizing and power saving. The main body cover 12 and the upper cover 11 may be an integral member.

  In the blower 1, the inner side surface forming the cylindrical space 71 is the outer peripheral surface of the motor cover 321 of the motor unit 16. The motor cover 321 is a metal cover. Thereby, the motor part 16 is efficiently cooled by the air flowing through the cylindrical space 71. The inner side surface forming the cylindrical space 71 may be the outer peripheral surface of the metal holding portion that holds the outer periphery of the motor portion 16.

  FIG. A is a perspective view of the main body cover 12 as viewed obliquely from above. FIG. B is a perspective view of the main body cover 12 as viewed obliquely from below. The main body cover 12 includes a cylindrical portion 121 and a plurality of guide blades 122. The cylindrical portion 121 has a substantially cylindrical shape centered on the central axis J1. The cylindrical part 121 is located outside the motor part 16 in the radial direction. The guide blade 122 is located on the inner peripheral surface of the cylindrical portion 121. The upper end of the guide blade 122 is opposed to the stator 322 in the radial direction through the motor cover 321. The plurality of guide blades 122 are arranged at equal intervals in the circumferential direction. Each guide blade 122 has a plate shape that protrudes radially inward from the inner peripheral surface of the cylindrical portion 121. In addition, the thickness of the guide blade 122 may not be constant. Each guide blade 122 extends downward, but is inclined downward in the rotational direction of the upper impeller 15a. Each guide blade 122 extends downward from a position away from the upper end of the cylindrical portion 121.

  When the motor unit 16 is disposed in the main body cover 12, air is guided downward by a pair of adjacent guide blades 122, the outer peripheral surface of the motor unit 16, and the inner peripheral surface of the cylindrical unit 121. An air flow path 713 is configured. That is, the cylindrical space 71 is a first cylindrical space 711 positioned above the air flow path 713 and a second cylindrical space positioned below the first cylindrical space 711 and including a plurality of air flow paths 713. 712. The first cylindrical space 711 is located below the lower end portion of the outer edge portion 154 of the upper impeller 15a.

  The plurality of air flow paths 713 are arranged in the circumferential direction. The air flow path 713 is also inclined in the circumferential direction due to the inclination of the guide blade 122. The flow path outlet 715 is located on the front side in the rotation direction of the upper impeller 15a with respect to the flow path inlet 714 of the air flow path 713. By providing the air flow path 713, the backflow of the air flowing into the cylindrical space 71 from the upper impeller 15a is prevented, and the static pressure of the blower 1 can be improved. In addition, the static pressure can be further improved by inclining the air flow path 713.

  The diffuser 13 is attached to the lower end of the main body cover 12. The upper end of the diffuser 13 faces the lower end of the motor cover 321 in the radial direction. FIG. A is the perspective view which looked at the diffuser 13 from diagonally upward. FIG. B is a perspective view of the diffuser 13 as viewed obliquely from below. The diffuser 13 includes a lower annular portion 131, a plurality of guide blades 132, and an outer peripheral portion 133. The lower annular portion 131 has an annular shape perpendicular to the central axis J1 and is located below the motor portion 16. The upper surface of the lower annular portion 131 is perpendicular to the central axis J1, and the lower surface is inclined upward inward in the radial direction. The plurality of guide blades 122 are disposed on the upper surface of the lower annular portion 131. The plurality of guide blades 132 are arranged in the circumferential direction. A lower portion of the outer peripheral portion 133 of the diffuser 13 constitutes a part of the exhaust port 142.

  Each guide blade 132 has a plate shape that protrudes upward from the upper surface of the lower annular portion 131, and extends radially outward from the center of the lower annular portion 131. The upper edge of each guide blade 132 is perpendicular to the central axis J1. The circuit board 53 of the motor unit 16 is close to or in contact with the upper end of the guide blade 132. Thereby, a plurality of lower air flow paths 73 are provided in the space between the motor unit 16 and the lower annular portion 131. Each lower air flow path 73 includes a circuit board 324, a lower annular portion 131, and a pair of guide blades 132 adjacent to each other. The thickness of the guide wing 132 may or may not be constant. Each guide blade 132 may be linear or curved.

  The number of guide blades 132 is the same as the number of guide blades 122 of the main body cover 12. The radially outer end of each guide blade 132 is located below the lower end of the guide blade 122 of the main body cover 12. The lower end of the guide wing 122 of the main body cover 12 may be located radially outside the outer end of the guide wing 132 of the diffuser 13. By arranging the guide blades 122 and the guide blades 132 so as to be connected, the plurality of lower air flow paths 73 extend radially inward from the lower ends of the plurality of air flow paths 713. Thereby, the air flow is also adjusted between the motor unit 16 and the lower annular portion 131, and the static pressure of the blower 1 is improved. Further, since the top surfaces of the plurality of lower air flow paths 73 are the lower surfaces of the circuit board 324, the circuit board 324 is efficiently cooled.

  The lower impeller 15b has the same structure as the upper impeller 15a. In the following description, constituent elements of the lower impeller 15b are denoted by the same reference numerals as those of the upper impeller 15a. The lower impeller 15 b is located below the lower annular portion 131 and is connected to the shaft 311. The lower impeller 15b takes in air from the central opening of the diffuser 13 and sends out air radially outward. As described above, the lower surface of the diffuser 13 is recessed upward. A lower surface of the lower annular portion 131 and an inner peripheral surface of the outer peripheral portion 133 constitute a surface similar to the inner peripheral surface of the upper cover 11. That is, the top surface above the lower impeller 15b is inclined downward outward in the radial direction, and the cylindrical surface extends downward from the outer periphery of the top surface. The top surface and the cylindrical surface are smoothly connected. The static pressure of the blower 1 is further increased by the lower impeller 15b.

  The lower cover 14 closes the lower part of the diffuser 13. The lower cover 14 includes an annular groove 141 centered on the central axis J1. The annular groove 141 is recessed downward. A lower portion of the outer edge portion 154 of the blade 152 of the lower impeller 15 b is located in the annular groove 141. The lower cover 14, together with the diffuser 13, constitutes a plurality of exhaust ports 142 that open radially outward on the outer periphery. Each exhaust port 142 is connected to the annular groove 141. The air is discharged to the outside approximately directly from the lower impeller 15b or after flowing through the annular groove 141. As shown in FIG. 2, the opening inner surface of the exhaust port 142 is inclined with respect to the radially outward direction along the air turning direction.

  FIG. 7 is a diagram for explaining the position in the axial direction of the flow path inlet 714 of the air flow path 713. In the blower 1, the flow path inlet 714 is not disposed on the radially outer side of the upper impeller 15a in order to reduce the size in the radial direction. Therefore, the flow path inlet 714 is disposed below the outer edge 154 of the blade 152. However, when the flow path inlet 714 is brought close to the outer edge portion 154, the air containing the vibration component due to the turbulence of the air flow by the upper impeller 15a strongly collides with the flow path inlet 714, and the noise increases. Therefore, as described above, in the blower 1, the first cylindrical space 711 is provided above the air flow path 713.

  The outer wall forming the first cylindrical space 711, that is, the inner peripheral surface of the main body cover 12 plays a role of reducing the momentum of the air and attenuating the vibration component of the air when the air collides. . From such a viewpoint, it is desirable that the flow path inlet 714 is positioned below the virtual air flow that flows straight from the intake port 113 to the cylindrical space 71. Therefore, the flow path inlet 714 is disposed below a virtual straight line connecting the lower end of the inner diameter of the intake port 113 and the lower end of the outer periphery of the upper impeller 15a and a virtual extension line 72 that is an extension thereof. Thereby, noise can be reduced effectively.

  FIG. 8 is a front view of a blower 1a according to another exemplary embodiment of the present invention. FIG. 9 is a longitudinal sectional view of the blower 1a. In the blower 1a, two exhaust ports 142 are provided on the outer peripheral surface of the lower portion. The blower device 1 a further includes an intermediate member 17 between the upper impeller 15 a and the motor unit 16 in the axial direction as compared with the blower device 1. The upper bearing holding portion 323 is fixed to the intermediate member 17. The other structure is the same as that of the blower 1 except for the difference in shape, and the description of the blower 1 is applied as it is. Hereinafter, the same reference numerals are given to the same components as the blower 1.

  FIG. A is a perspective view of the intermediate member 17 as viewed obliquely from above. FIG. B is a plan view of the intermediate member 17. The intermediate member 17 includes an annular portion 171 surrounding the central axis J1. The upper end of the outer edge portion of the intermediate member 17 is connected to the lower end of the upper cover 11. The lower end of the outer edge portion of the intermediate member 17 is connected to the upper end of the main body cover 12. A central portion 172 that is an inner portion of the annular portion 171 has a substantially plate shape. A concave portion to which the bearing holding portion 323 is attached is provided on the lower surface of the central portion 172. A through hole 173 into which the shaft 311 is inserted is provided at the center of the center portion 172.

  The annular portion 171 is located below the outer edge portion 154 of the upper impeller 15a. The annular portion 171 is provided with a guide groove 174 that is recessed downward. The guide groove 174 extends in the circumferential direction and exists over the entire circumference of the annular portion 171. The lower end of the outer edge portion 154 of the upper impeller 15 a is located in the guide groove 174. The annular portion 171 has two air supply holes 175 passing through the intermediate member 17 in the vertical direction in the guide groove 174. Note that FIG. In A, the intermediate member 17 is viewed from the direction in which the air supply holes 175 are not visible. The cross section of the guide groove 174 may be U-shaped, V-shaped, or square.

  FIG. 11 is a vertical cross-sectional view of the air supply hole 175 with a cylindrical surface centered on the central axis J1. The air supply hole 175 is inclined downward in the rotation direction of the upper impeller 15a. The air supply hole 175 guides the air from the upper impeller 15 a to the cylindrical space 71 between the motor unit 16 and the main body cover 12. Thereby, the air from the upper impeller 15a is prevented from directly entering the air flow path 713, and noise is reduced. The guide groove 174 regulates the flow of air from the upper impeller 15a and efficiently guides it to the air supply hole 175. The static pressure of the blower 1a is also improved by the rectifying action by the air supply hole 175.

  Similar to the air blower 1 of FIG. 3, the air supply hole 175 is located below the upper impeller 15a, so that the air blower 1a in the radial direction can be downsized. Moreover, when the air supply hole 175 is inclined, the static pressure of the blower 1a can be further improved. In the air blower 1a, noise reduction by the intermediate member 17 is realized even when the air flow path 713 is not provided. The number of air supply holes 175 may be more than two.

  The guide groove 174 of the annular portion 171 may not be provided on the entire circumference. In this case, the lower end of the outer edge portion 154 of the wing 152 is not located in the guide groove 174. Therefore, only a part of the outer edge portion 154 in the radial direction may be positioned above the guide groove 174. Preferably, a guide groove 174 is located below the outer periphery of the upper impeller 15a. The air supply hole 175 is located in the guide groove 174.

  The blower 1, 1a can be variously modified.

  For example, the shapes of the upper impeller 15a and the lower impeller 15b may be changed as appropriate. The outer edge part 154 of the wing | blade 152 does not need to protrude below. The shapes of the upper impeller 15a and the lower impeller 15b need not be the same. In the air blowers 1 and 1a, the lower impeller 15b or the lower impeller 17 and the diffuser 13 may be omitted, and only the upper impeller 15a may be provided.

  The motor unit 16 may be an outer rotor type. However, in consideration of the cooling efficiency of the motor unit 16, the motor unit 16 is preferably an inner rotor type in which the rotor magnet 313 is positioned inside the stator 210.

  The guide blade 122 may be provided on the motor unit 16 side. The guide blades 132 may also be provided on the circuit board 53 side. The air flow path 713 and the lower air flow path 73 are not limited to those in which the space is partitioned by the wings. For example, the main body cover 12 may be thickened and a hole penetrating the main body cover 12 in the vertical direction may be provided as an air flow path. The same applies to the lower air flow path 73. Further, as the guide blades 122 and 132, linear plates having a constant thickness may be provided.

  The motor cover 321 may be made of resin. Moreover, the outer periphery of the metal cover may be partially covered with resin. By forming a part of the outer periphery of the motor cover 321 with resin, the guide blade 122 and the cylindrical portion 121 can be integrally molded.

  The gas blown by the blower 1, 1a is not limited to air. Therefore, in general, “air channel 713” and “lower air channel 73” can be expressed as “gas channel 713” and “lower gas channel 73”, respectively. Moreover, the use of the air blowers 1 and 1a is not limited to a vacuum cleaner, but is suitable for a device that sucks or delivers gas and requires high static pressure.

  The configurations in the above embodiment and each modification may be combined as appropriate as long as they do not contradict each other.

  The blower according to the present invention is particularly suitable for a blower of a vacuum cleaner, but the blower can be used for other devices. In particular, it is suitable for an apparatus that is required to suck or discharge gas at a high static pressure.

DESCRIPTION OF SYMBOLS 1,1a Blower 8 Vacuum cleaner 11 Upper cover 12 Main body cover 15a Upper impeller 15b Lower impeller 16 Motor part 17 Intermediate member 31 Rotating part 71 Cylindrical space 72 Virtual extension line 73 Lower air flow path (lower gas flow path)
81 Suction pipe 113 Intake port 131 Lower annular part 154 (Edge) outer edge part 171 Annular part 174 Guide groove 175 Air supply hole 321 Motor cover (metal cover)
324 Circuit board 711 1st cylindrical space 712 2nd cylindrical space 713 Air flow path (gas flow path)
714 Channel inlet 715 Channel outlet J1 Central axis

Claims (11)

A motor unit whose central axis is directed vertically,
An impeller located above the motor unit, connected to the rotating unit of the motor unit, and rotated to suck air from above and send gas radially outward or radially outward and downward. When,
An upper cover having an inner peripheral surface covering the outer periphery and the upper edge of the impeller, and having an air inlet in the center;
A body cover that covers the outer periphery of the motor unit and forms a cylindrical space between the outer periphery of the motor cover that is the outer periphery of the motor unit;
A lower annular part that is located below the motor part and is perpendicular to the central axis and annular;
An exhaust port located below the lower annular portion;
With
The cylindrical space is
A first cylindrical space located below the lower end of the outer edge of the impeller and configured as a single gas flow path ;
A second cylindrical space located under the first cylindrical space and having a plurality of gas flow paths arranged in the circumferential direction;
Including
Channel inlets of the plurality of gas channels are located below a virtual extension line connecting the lower end of the inner diameter of the intake port and the lower end of the outer periphery of the impeller,
In the space between the motor part and the lower annular part, a plurality of lower gas flow paths extending radially inward from the lower ends of the plurality of gas flow paths are provided,
The air blower in which the top surfaces of the plurality of lower gas flow paths are the lower surfaces of the circuit board of the motor unit.   The blower according to claim 1, wherein an outer diameter of the impeller is smaller than an outer diameter of the cylindrical space. A motor unit whose central axis is directed vertically,
An impeller located above the motor unit, connected to the rotating unit of the motor unit, and rotated to suck air from above and send gas radially outward or radially outward and downward. When,
An upper cover that covers the outer periphery and the outer edge of the impeller and has an air inlet in the center;
A body cover covering the outer periphery of the motor unit;
An intermediate member located between the impeller and the motor part in the axial direction and including an annular part surrounding the central axis;
With
The annular portion is located below the outer edge or the outer periphery of the impeller, and has a guide groove that is recessed downward and extends in the circumferential direction.
The annular part has a plurality of air supply holes for guiding the gas from the impeller into the cylindrical space between the motor part and the main body cover in the guide groove,
The said guide groove exists over the perimeter of the said annular part, and the lower end of the said outer edge part of the said impeller is an air blower located in the said guide groove.   The air blower according to claim 3, wherein the plurality of air supply holes are inclined downward in a rotation direction of the impeller.   The air blower according to claim 3 or 4, further comprising a plurality of gas flow paths positioned in a space between the motor unit and the main body cover and arranged in a circumferential direction. A lower annular part that is located below the motor part and is perpendicular to the central axis and annular;
Further comprising
The air blower according to claim 5, wherein a plurality of lower gas passages extending radially inward from lower ends of the plurality of gas passages are provided in a space between the motor portion and the lower annular portion.   The blower device according to claim 6, wherein a top surface of the plurality of lower gas flow paths is a lower surface of a circuit board of the motor unit.   The plurality of gas flow paths are inclined in the circumferential direction, and the flow path outlet is positioned forward of the impeller in the rotation direction with respect to the flow path inlet of the gas flow path. A blower according to the above.   The blower according to any one of claims 1, 2, and 6 to 8, further comprising another impeller that is positioned below the lower annular portion and connected to the rotating portion. The blower according to any one of claims 1 to 9, wherein an inner side surface forming the cylindrical space between the motor unit and the main body cover is an outer peripheral surface of a metal cover of the motor unit. A blower device according to any one of claims 1 to 10,
A suction pipe having a flow path connected to the intake port of the upper cover;
A vacuum cleaner.

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