JPWO2018083783A1 - Electric blowers, vacuum cleaners, and hand dryers - Google Patents

Abstract

  An electric blower with improved efficiency, and a vacuum cleaner and a hand dryer provided with the electric blower. An electric motor, a centrifugal impeller, a main plate (11), and a plurality of stationary blades (12) are provided. Each of the plurality of stator vanes (12) has a tangent of a center line passing through the inner peripheral end and an arc passing through the inner peripheral end about the rotation center (O) passing through the inner peripheral end and the inner peripheral end The tangent line which has a tangent has an entrance installation angle which makes on a section. In each of the plurality of vanes (12), the first inlet setting angle on the first cross section perpendicular to the extending direction is at a position farther from the first surface (11A) of the main plate (11) than the first cross section. And is smaller than the second inlet installation angle on the second cross section perpendicular to the extending direction.

Description

  The present invention relates to an electric blower, a vacuum cleaner, and a hand dryer.

  BACKGROUND Conventionally, an electric blower used in a vacuum cleaner is known. The electric blower mainly includes a centrifugal impeller fixed to a rotating shaft rotated by a motor and a diffuser formed on the downstream side of the centrifugal impeller. The centrifugal impeller includes a boss portion and a plurality of moving blades formed on the inlet portion on the boss portion. The diffuser includes a substrate (main plate) formed between the motor and the centrifugal impeller, a plurality of stator blades formed on the substrate on the air inlet side, and a plurality of return stator blades formed on the motor side. Including. There are diffusers in which the flow changing portion returning from the side of the stationary blade to the side of the stationary blade has a substantially spiral shape to reduce the ventilation resistance (see, for example, JP-A-2010-249038 (Patent Document 1)).

  Generally, in the electric blower, the flow velocity of the gas blown out from the centrifugal impeller differs depending on the position in the extension direction of the rotation shaft. Specifically, the flow velocity of the gas flowing out between the plurality of moving blades through the position close to the boss portion in the extending direction passes through the position distant from the boss portion in the extending direction and flows between the plurality of moving blades Slower than the absolute flow rate of the gas flowing out of the The outflow direction of the gas blown out from the centrifugal impeller differs depending on the flow rate. Therefore, the outflow angle formed between the outflow direction of the gas blown out from the centrifugal impeller and the rotational direction of the rotation shaft differs depending on the position in the extension direction.

JP, 2010-249038, A

  In the conventional electric blower, the center line of each of the plurality of stator blades in a cross section perpendicular to the extending direction is an inner peripheral end located closest to the rotation axis and an outer peripheral end located farthest from the rotation axis have. And, each of the plurality of stator vanes has an inlet formed in a cross section on a tangent line in contact with the center line and the inner peripheral end, an arc passing through the inner peripheral end about the rotation axis and a tangent in contact at the inner peripheral end. It has an installation angle. And in the conventional electric blower, regardless of the position of the above-mentioned cross section in the direction of extension of the axis of rotation, the inlet installation angle of each of the plurality of stator blades is formed constant.

  Therefore, the inlet installation angle of the conventional electric blower does not correspond to the outflow angle at least at a part in the extending direction, and at least a part of the gas blown out from the centrifugal impeller is along the stationary blade. It can not flow. For example, when the inlet installation angle is formed along the outflow direction of the gas flowing out between the plurality of moving blades through the position apart from the boss portion in the extension direction, the boss in the extension direction The gas flowing out between the plurality of moving blades through the position close to the part can not flow along the outer shape of the stationary blade. Therefore, the gas flow is disturbed between the plurality of stator blades, and a backflow occurs locally. As a result, it has been difficult to improve the efficiency of the conventional electric blower. In particular, in the conventional electric blower of which the diameter is reduced, there is a problem that the efficiency is greatly reduced due to the disturbance among the plurality of stationary blades.

  The present invention has been made to solve the problems as described above. The main object of the present invention is to provide an electric blower with improved efficiency, and a vacuum cleaner and a hand dryer provided with the electric blower.

  The electric blower according to the present invention comprises an electric motor including an electric motor and a rotary shaft rotated by the electric motor, a centrifugal impeller connected to the rotary shaft, and an electric motor and a centrifugal impeller in the extending direction of the rotary shaft. And a plurality of stationary blades formed to surround the centrifugal impeller in a direction intersecting the extending direction. The main plate extends in the cross direction and has a first surface located on the centrifugal impeller side in the extension direction. Each of the plurality of vanes is coupled to the first surface. In the extending direction, the center line of each of the plurality of vanes in a cross section perpendicular to the extending direction includes an inner peripheral end located closest to the rotation axis and an outer peripheral end located farthest from the rotation axis Have. Each of the plurality of vanes has an inlet installation angle formed by a tangent line tangent to the center line and the inner circumferential edge, an arc passing through the inner circumferential edge about the rotation axis, and a tangent tangent to the inner circumferential edge on the cross section Have. In each of the plurality of vanes, the inlet installation angle on the first cross section perpendicular to the extending direction is at a position farther from the first plane than the first cross section, and on the second cross section perpendicular to the extending direction Smaller than the entrance installation angle at

  According to the present invention, in each of the plurality of vanes, the inlet installation angle on the first cross section perpendicular to the extending direction of the rotation axis is at a position farther from the first surface than the first cross section and It is smaller than the inlet installation angle on the second cross section perpendicular to the extending direction. Therefore, according to the electric blower according to the present invention, it is suppressed that a flow of gas which can not flow between the plurality of stator blades is formed along the inlet installation angle, as compared with the conventional electric blower. . Therefore, according to the present invention, it is possible to provide an electric blower with improved efficiency, and a vacuum cleaner and a hand dryer provided with the electric blower.

FIG. 2 is a cross-sectional view of the electric blower according to Embodiment 1 along the extending direction of the rotation shaft. 1 is a perspective view showing a diffuser according to Embodiment 1. FIG. FIG. 2 is a view showing an inlet installation angle and an outlet installation angle of the stator blade according to the first embodiment. 5 is a graph showing a change rate of an inlet installation angle of the stationary blade according to the first embodiment. It is a figure which shows the absolute velocity distribution of the gas which blew off from the centrifugal impeller which concerns on Embodiment 1 calculated | required by fluid analysis. FIG. 7 is a view showing an inlet installation angle and an outlet installation angle of a stator blade according to a second embodiment. FIG. 10 is a perspective view showing a diffuser according to Embodiment 3. FIG. 7 is a view showing a vane according to a third embodiment. 15 is a graph showing the rate of change of the inlet installation angle of the stationary blade according to the fourth embodiment. 15 is a graph showing the rate of change of the outlet installation angle of the stationary blade according to Embodiment 4. FIG. 16 is a cross-sectional view of a portion positioned on the inner peripheral side in the stator blade according to Embodiment 4, taken along the extending direction of the rotation axis. FIG. 21 is a cross-sectional view of a portion positioned on the outer peripheral side in the stator blade according to Embodiment 4, taken along the extending direction of the rotation axis. It is a schematic diagram which shows the vacuum cleaner which concerns on Embodiment 5. FIG. FIG. 21 is a schematic view showing a hand dryer according to Embodiment 6.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

Embodiment 1
<Configuration of electric blower>
The electric blower according to the first embodiment will be described with reference to FIGS. 1 to 4. Arrows in FIG. 1 illustrate a part of the flow of gas in the electric blower.

  As shown in FIG. 1, the electric blower 1 according to the embodiment of the present invention mainly includes an electric unit 2, a centrifugal impeller 6 and a diffuser 10.

  The motor unit 2 includes a rotor 3 and a stator 4 as a motor and a shaft 5 (rotational shaft) as an output shaft connected to the rotor 3. The motor unit 2 rotates the centrifugal impeller 6 via the shaft 5 (rotational shaft). Hereinafter, the extension direction of the shaft 5 (the extension direction of the rotation center O indicated by a one-dot chain line in FIG. 1) will be simply referred to as the extension direction. Hereinafter, a radial direction which is perpendicular to the extending direction and extends from the center of the shaft 5 toward the outer peripheral side is simply referred to as a radial direction. Hereinafter, in the extension direction, the suction side of the electric blower 1 is referred to as the front side, and the side opposite to the suction side is referred to as the rear side.

  The centrifugal impeller 6 includes a hub 7 and a plurality of moving blades 8. The hub 7 has a circular outer shape in plan view. The central portion of the hub 7 in the radial direction protrudes toward the front as compared with the outer peripheral portion of the hub 7 located on the outer peripheral side of the central portion in the radial direction. The plurality of moving blades 8 are provided spaced apart from each other in the rotational direction perpendicular to the extending direction.

  The diffuser 10 is disposed downstream of the centrifugal impeller 6 in a flow path of gas formed in the electric blower 1. The diffuser 10 is composed of a main plate 11, a plurality of vanes 12, a return vane 13, a fan cover 14 and a bracket 15.

  The main plate 11 is disposed between the centrifugal impeller 6 and the motor. The main plate 11 is disposed downstream of the centrifugal impeller 6. The main plate 11 is disposed on the outer peripheral side of the centrifugal impeller 6 in the radial direction. The main plate 11 extends in the intersecting direction and extends in the intersecting direction with a first surface 11A located on the centrifugal impeller 6 side (front side) in the extending direction, and on the motor side (in the extending direction And a second surface 11B located on the rear side). When viewed from the extending direction, the outer shape of the main plate 11 is circular. When viewed from the extending direction, the planar shape of the main plate 11 is, for example, an annular shape.

  The plurality of vanes 12 are connected to the first surface 11A of the main plate 11. Each of the plurality of stationary blades 12 is formed on the outer peripheral side of the plurality of moving blades 8 in the radial direction. The plurality of vanes 12 are formed spaced apart from one another in the rotational direction. The detailed configuration of the plurality of vanes 12 will be described later. The plurality of return vanes 13 are connected to the second surface 11B of the main plate 11. The plurality of return vanes 13 are formed spaced apart from each other in the rotational direction.

  The fan cover 14 is formed to enclose the centrifugal impeller 6 and the plurality of stator blades 12. The fan cover 14 is disposed outside the plurality of moving blades 8 and the plurality of stationary blades 12 in the extension direction. The fan cover 14 is disposed outside the main plate 11 in the radial direction. A gap 21 is formed between the main plate 11 and the fan cover 14 to connect the gas flow path between the stationary blades 12 and the gas flow path between the return stationary blades 13. In the gap 21, the flow direction of the gas is turned. A bell mouth 18 defining an opening is provided at the center of the fan cover 14 at a position facing the suction port 17 of the centrifugal impeller 6.

  The bracket 15 is formed to be connected to the fan cover 14 and to enclose the return vane 13. The bracket 15 is formed with a plurality of discharge ports 16 formed so that the air passing through the centrifugal impeller 6 and the diffuser 10 is discharged in order. Below the bracket 15, a motor frame 19 connected to the bracket 15 and including the motorized portion 2 is provided. In the motor frame 19, discharge ports 20 are formed at a plurality of locations from which the air that has passed through the centrifugal impeller 6, the diffuser 10 and the electric unit 2 is discharged in order.

  Next, the detailed configuration of the plurality of vanes 12 will be described with reference to FIGS. 1 to 4. As shown in FIG. 1 and FIG. 2, each of the plurality of vanes 12 has a first portion 12A as an end located on the rear side in the extension direction, and an end located on the front side in the extension direction And a second part 12B as a part. The first portion 12 </ b> A is a part of the vane 12 connected to the first surface 11 </ b> A of the main plate 11. From a different point of view, the first portion 12A is a portion of the vane 12 that appears in a first cross section perpendicular to the extending direction. The first cross section is a cross section formed on the same plane as the first surface 11A. The second portion 12 </ b> B is, for example, a part of the vane 12 connected to the fan cover 14. From a different point of view, the second portion 12B is a portion of the vane 12 that appears in a second cross section perpendicular to the extending direction. The second cross section is at a position farther from the first surface 11A than the first cross section by the length of the vane 12 in the extending direction. In FIG. 3, the first portion 12A and the second portion 12B are shown superimposed and projected on a plane parallel to the first cross section and the second cross section. In FIG. 3, only a part of the plurality of vanes 12 is illustrated. The cross-sectional shape perpendicular to the extending direction of the first portion 12A is, for example, equal to the cross-sectional shape perpendicular to the extending direction of the second portion 12B.

  As shown in FIG. 3, the first center line CLA of the first portion 12A is located at a first end FEA (inner peripheral end) located closest to the rotation center O and at a position farthest from the rotation center O And a second end portion BEA (peripheral end portion). The first center line CLA is a line connecting the center of a circle inscribed in the outline located forward in the rotational direction of the first portion 12A and the outline located behind the first portion 12A. The first center line CLA is formed, for example, in an arc shape. The first end FEA is formed rearward of the second end BEA in the rotational direction.

  As shown in FIG. 3, the second center line CLB of the second portion 12B is located at the third end FEB (inner peripheral end) located closest to the rotation center O and at a position farthest from the rotation center O And a fourth end BEB (peripheral end). The second center line CLB is a line connecting the center of a circle inscribed in the outline located forward in the rotational direction of the second portion 12B and the outline located behind the second portion 12B. The second center line CLB is formed, for example, in an arc shape. The third end FEB is formed rearward of the fourth end BEB in the rotational direction.

As shown in FIG. 3, consider the first tangent TFA and the second tangent T1 for the first part 12A. The first tangent TFA is a tangent of the first center line CLA of the first portion 12A, which passes through the first end portion FEA. The second tangent T1 is a tangent of a first arc CI1 passing through the first end FEA and passing through the first end FEA around the rotation center O. The first tangent TFA and the second tangent T1 form a first inlet setting angle θ _IA on the first cross section.

As shown in FIG. 3, consider the third tangent TFB and the fourth tangent T1 for the second part 12B. The third tangent TFB is a tangent of the second center line CLB of the second portion 12B, which passes through the third end FEB. The fourth tangent T1 is a tangent of a second arc CI1 passing through the third end FEB and passing through the third end FEB about the rotation center O. The fourth tangent line is indicated by T1 in FIG. 3 because it overlaps the second tangent line when viewed from the extending direction. The second arc overlaps with the first arc CI1 when viewed from the extending direction, and therefore, is indicated by CI1 in FIG. The third tangent TFB and the fourth tangent T1 form a second inlet setting angle θ _IB on the second cross section.

As shown in FIG. 3, consider the fifth tangent line TBA and the sixth tangent line T2 with respect to the first portion 12A. The fifth tangent line TBA is a tangent to the first center line CLA passing through the second end BEA. The sixth tangent T2 is a tangent of a third arc CI2 that passes through the second end BEA and that is centered on the rotation center O and that passes through the second end BEA. The fifth tangent line TBA and the sixth tangent line T2 form a first outlet setting angle θ _OA on the first cross section.

As shown in FIG. 3, consider a seventh tangent line TBB and an eighth tangent line T3 for the second part 12B. The seventh tangent line TBB is a tangent to the second center line CLB passing through the fourth end BEB. The eighth tangent T3 is a tangent of a fourth arc CI3 passing through the fourth end BEB and passing through the fourth end BEB centered on the rotation center O. The seventh tangent TBB and the eighth tangent form a second outlet installation angle θ _OB on the second cross section.

As shown in FIG. 3, each of the plurality of vanes 12 is configured such that the first inlet installation angle θ _IA is smaller than the second inlet installation angle θ _IB . Each of the plurality of stator blades 12 is configured such that the first outlet installation angle θ _OA is smaller than the second outlet installation angle θ _OB . In the plurality of stator blades 12, the first end FEA and the third end FEB are formed to overlap in the extension direction. In the plurality of vanes 12, the second end BEA is formed forward of the fourth end BEB in the rotational direction. In the plurality of vanes 12, the second end BEA is formed more inward in the radial direction than the fourth end BEB.

In any cross section perpendicular to the extending direction, the inlet installation angle of each of the plurality of vanes 12 can be defined in the same manner as the first inlet installation angle θ _IA and the second inlet installation angle θ _IB . In any cross section perpendicular to the extending direction, the outlet installation angle of each of the plurality of vanes 12 may be defined in the same manner as the first outlet installation angle θ _OA and the second outlet installation angle θ _OB . And when considering arbitrary two cross sections perpendicular to the above-mentioned extending direction about each of a plurality of stator vanes 12, the entrance installation angle in one cross section near the 1st field 11A is more than the one cross section It is smaller than the entrance installation angle in the other cross section distant from 1 side 11A.

As shown in FIG. 2 and FIG. 3, in the plurality of stator blades 12, the portion positioned on the outer peripheral side than the inner peripheral end portion is, for example, directed from the first portion 12A to the second portion 12B in the extending direction It inclines so that it may go to the back side of the above-mentioned rotation direction as. In each of the plurality of vanes 12, the inlet installation angle in the third cross section which is located between the first cross section and the second cross section and is perpendicular to the extending direction is, for example, the first inlet installation angle θ _IA It is over and less than the second inlet setting angle θ _IB . In each of the plurality of vanes 12, the outlet installation angle in the third cross-section, for example a first outlet disposed angle theta _OA beyond than the second outlet installation angle theta _OB.

  As shown in FIG. 4, the inlet installation angles of the plurality of vanes 12 change at a constant rate, for example, according to the position in the extension direction (the height with respect to the first surface 11A). The horizontal axis in FIG. 4 indicates the positions of the plurality of stationary blades 12 in the extending direction, and the vertical axis in FIG. 4 indicates the installation angle at the position. Similarly, the outlet installation angles of the plurality of stator blades 12 change at a constant rate, for example, according to the position in the extension direction (the height with respect to the first surface 11A).

  In the plurality of stator blades 12, each of the plurality of first end portions FEA is disposed on the first arc CI1, and each of the plurality of third end portions FEB is disposed on the second arc CI1. In the plurality of stator blades 12, each of the plurality of second ends BEA is disposed on the third arc CI2, and each of the plurality of fourth ends BEB is disposed on the fourth arc CI3.

  As shown in FIGS. 1 and 2, the outer diameter L1 of the plurality of vanes 12 is larger than the outer diameter L2 of the main plate 11. The outer diameter L1 of the plurality of vanes 12 is equal to the diameter of a circle connecting the portions of the second portions 12B of the plurality of vanes 12 located on the outermost peripheral side in the radial direction. Approximately equal. The outer diameter L2 of the main plate 11 is equal to or greater than the diameter of the first arc CI1. The outer diameter L2 of the main plate 11 is less than the diameter of the fourth arc CI3.

  As shown in FIG. 3, in the cross section perpendicular to the extending direction, the center of curvature of the outline of each of the plurality of vanes 12 located forward in the rotational direction is ahead of the outline of the front. positioned. In the cross section, the center of curvature of the outline of each of the plurality of stationary blades 12 located rearward in the rotational direction is located forward of the front outline. The distance between the outline located forward in the rotational direction of the vane 12 and the outline located behind it, in other words, the thickness of the vane 12, is substantially equal in the direction in which the center line extends.

<Operation of the electric blower>
As shown in FIG. 1, in the electric blower 1, when electric power is supplied to the electric unit 2, the shaft 5 rotates. As the shaft 5 rotates, the centrifugal impeller 6 attached to the shaft 5 rotates and sucks air from the suction port 17. The air sucked into the electric blower 1 by the centrifugal impeller 6 is boosted and accelerated by the centrifugal impeller 6 and travels radially outward while turning. The air discharged from the centrifugal impeller 6 is decelerated and pressurized between the plurality of vanes 12 of the diffuser 10. Thereafter, the gas flowing between the plurality of stator blades 12 flows out into the gap 21. A part of the gas that has flowed out into the gap 21 is guided by the return stator vane 13 to the motorized portion 2 side, and is discharged to the outside of the electric blower 1 from the discharge port 20. The remainder of the gas that has flowed out into the gap 21 is discharged to the outside of the electric blower 1 from the discharge port 16.

<Operation effect of electric blower>
As shown in FIGS. 1 to 4, the electric blower 1 is disposed between an electric motor including the shaft 5, the centrifugal impeller 6 connected to the shaft 5, and the electric motor and the centrifugal impeller 6. A main plate 11 and a plurality of stationary blades 12 formed to surround the centrifugal impeller 6 in a direction intersecting the extending direction are provided. The main plate 11 has a first surface 11A that extends in the intersecting direction and is located on the centrifugal impeller 6 side in the extending direction. Each of the plurality of vanes 12 is connected to the first surface 11A. The center line of each of the plurality of vanes 12 in the cross section perpendicular to the extending direction has an inner circumferential end closest to the shaft 5 and an outer circumferential end farthest from the shaft 5 There is. Each of the plurality of vanes 12 has an inlet installation angle formed by a tangent line tangent to the center line and the inner circumferential edge, an arc passing through the inner circumferential edge about the shaft 5 and a tangent tangent to the inner circumferential edge on a cross section have. In each of the plurality of vanes 12, the first inlet setting angle θ _IA on the first cross section perpendicular to the extending direction is at a position farther from the first surface 11A than the first cross section, and the extending direction Smaller than the second inlet setting angle _IB on the second cross section perpendicular to the

  As shown in FIG. 5, in the electric blower 1, the flow velocity of the gas blown out from the centrifugal impeller 6 exhibits a distribution according to the position in the extension direction. The flow velocity of the gas blown out from the region relatively close to the hub 7 (see FIG. 1) in the extension direction is the gas blown out from the region relatively far from the hub 7 (see FIG. 1) in the extension direction Slower than the flow rate of

  The outflow direction of the gas blown out of the centrifugal impeller 6 differs depending on the flow velocity of the gas. When the flow velocity of the gas blown out from the centrifugal impeller 6 is divided into the velocity component along the radial direction and the velocity component along the rotational direction, the velocity component along the radial direction is directed to the stationary blade 12 Gradually decreases, and the ratio of the rotational direction component gradually increases. Therefore, in the gas blown out from the centrifugal impeller 6, the outflow angle formed by the outflow direction and the rotation direction is a low angle. In the gas blown out at a lower speed from the centrifugal impeller 6, the outflow angle formed by the outflow direction and the rotation direction becomes lower. That is, the outflow angle of the gas blown out from the region relatively close to the hub 7 in the extension direction is the gas blown out from the region relatively far from the hub 7 in the extension direction as it goes to the stator vanes 12 It becomes smaller than the outflow angle of

  Such speed distribution (outflow angle distribution) depends on the configuration of the centrifugal impeller, and the conventional electric blower also exhibits the same speed distribution. In the conventional electric blower, the inlet installation angles of the plurality of stationary blades are constant regardless of the position in the extension direction, and are not designed in consideration of the velocity distribution of the gas blown out from the centrifugal impeller. The Therefore, in the conventional electric blower, the flow of gas is disturbed between the plurality of stationary blades, and it is difficult to improve the efficiency. In particular, in the case of a conventional electric blower with a reduced diameter, the above-mentioned disturbance greatly reduces the efficiency. In the motor blower of which the diameter has been reduced, the centrifugal impeller, the main plate, and the fan guide are reduced in diameter. The outflow angle of the gas blown out of the smaller diameter centrifugal impeller is larger than the outflow angle of the gas blown out of the larger diameter centrifugal impeller. Therefore, in the small-sized electric blower, the gas having a larger outflow angle and showing the velocity distribution is formed between the stationary blades so as to form a constant inlet installation angle regardless of the position in the extension direction. Because of the inflow, the disturbance reduces the efficiency.

  On the other hand, in the electric blower 1, the inlet installation angles of the plurality of stationary blades 12 are designed in consideration of the velocity distribution of the gas blown out from the centrifugal impeller, and differ according to the position in the extension direction ing.

The gas blown out from the area relatively close to the hub 7 (see FIG. 1) in the extension direction flows into the area relatively close to the first surface 11A between the plurality of vanes 12. The gas blown out from the area relatively far from the hub 7 (see FIG. 1) in the extension direction flows into the area relatively far from the first surface 11A of the main plate 11 between the plurality of vanes 12. The inlet installation angle determined from the shape of the stator vane 12 on a cross section relatively close to the first surface 11A and perpendicular to the extension direction is relatively far from the first surface 11A and perpendicular to the extension direction It is smaller than the inlet installation angle determined from the shape of the vane 12 on the cross section. For example, the first inlet setting angle θ _IA is smaller than the second inlet setting angle θ _IB .

  Therefore, the plurality of stationary blades 12 of the electric blower 1 are formed along the outflow direction of the gas flowing out between the plurality of moving blades 7 through the position close to the hub 7 in the extending direction, and the extending It can be formed along the outflow direction of the gas flowing out from the plurality of moving blades through the position away from the hub 7 in the direction. As a result, in the electric blower 1, the gas blown out of the centrifugal impeller 6 can flow along the stationary blade 12 in the diffuser 10. Therefore, in the electric blower 1, compared to the conventional electric blower, the occurrence of flow separation is suppressed, the collision loss is reduced, and the efficiency is improved. In particular, even when the electric blower 1 is reduced in diameter, the electric blower 1 can include a plurality of vanes 12 that indicate the inlet installation angle according to the outflow angle of the gas blown out from the reduced-diameter centrifugal impeller 6. Therefore, the electric blower 1 has high efficiency even when the diameter is reduced.

In each of the plurality of stator blades 12 of the electric blower 1, the inlet installation angle on the third cross section which is located between the first cross section and the second cross section and which is perpendicular to the extending direction is the first It is larger than the inlet installation angle θ _{IA and} smaller than the second inlet installation angle θ _IB .

  The plurality of stator blades 12 of such an electric blower 1 are more appropriately formed in accordance with the velocity distribution shown in FIG. For example, the plurality of vanes 12 may be formed along the outflow direction of the gas flowing out between the plurality of blades 7 through the position apart from the hub 7 and the fan cover 14 in the extension direction. As a result, the electric blower 1 has higher efficiency than the conventional electric blower.

As shown in FIG. 3, in the electric blower 1, each of the plurality of stator blades 12 has a tangent line contacting the center line and the outer peripheral end, and an arc passing through the outer peripheral end about the rotation center O The tangent tangent at the outer peripheral end has an outlet installation angle formed on the cross section. In each of the plurality of vanes 12, the first outlet installation angle θ _OA on the first cross section is smaller than the second outlet installation angle _OB on the second cross section.

  Therefore, when the gas flowing between the plurality of stator blades 12 passes through the gap 21 and flows back into the space between the stator blades 13, the gas flowing out from between the plurality of stator blades 12 through the position close to the first surface 11A is a fan It can flow back between the stationary vanes 13 before colliding with the cover 14. As a result, the ventilation resistance of the gap 21 is reduced in the electric blower 1 as compared with the conventional electric blower.

  In the electric blower 1, in the cross section perpendicular to the extending direction, one outline and the other outline in the rotation direction of each of the plurality of stator blades 12 are substantially arc-shaped. Therefore, the flow path of the gas formed between the plurality of stator blades 12 does not rapidly expand in the middle, and from the upstream side located between the inner peripheral end to the downstream side located between the outer peripheral end It is formed smoothly. As a result, in the electric blower 1, the slower velocity gas among the gases flowing between the plurality of stationary blades 12 is suppressed from stalling.

  In the electric blower 1, when viewed from the extending direction, the outer shape of the main plate 11 is circular. Therefore, the end portion located on the inner peripheral side of the gap 21 is formed in an annular shape. As a result, in the electric blower 1, the ventilation resistance of the gap 21 is further reduced. The outer shape of the main plate 11 when viewed from the extending direction is not limited to a circular shape, and may be a substantially circular shape. The term "generally circular" refers to a shape that includes, in addition to a circular shape, an elliptical shape and the like. Further, the outer shape of the main plate 11 when viewed from the extension direction may be, for example, a polygon such as a regular dodecagon.

  In the electric blower 1, the outer diameter L 1 of the plurality of stator blades 12 is larger than the outer diameter L 2 of the main plate 11. In such an electric blower 1, while the gap 21 for turning the flow direction of the gas is formed between the main plate 11 and the fan cover 14, it is separated from the main plate 11 of the outer peripheral end of the plurality of stator blades 12 The portion at the second position is formed closer to the fan cover 14. Therefore, while the rise rate of static pressure is raised, the draft resistance is reduced and the electric blower 1 has high efficiency. The outer diameters of the plurality of vanes 12 may be equal to the outer diameter of the main plate 11.

In each of the plurality of stator blades 12, the third inlet installation angle may be at least the first inlet installation angle _θIA or more and the second inlet installation angle _θIB or less. Further, in each of the plurality of vanes 12, the third outlet installation angle may be any second outlet installation angle theta _OB than at least the first outlet installation angle theta _OA or more.

Second Embodiment
An electric fan according to a second embodiment will be described with reference to FIG. The electric blower according to the second embodiment basically has the same configuration as the electric blower 1 according to the first embodiment, but the second end BEA and the fourth end BEB of the plurality of stator blades 12 are the above-described ones. The difference is that they are formed to overlap in the extending direction. In FIG. 6, similarly to FIG. 3, the first portion 12A and the second portion 12B are shown superimposed and projected on a plane parallel to the first cross section and the second cross section.

  As shown in FIG. 6, also in the electric blower according to the second embodiment, the inlet installation angle in one cross section near the first surface 11A (see FIG. 1) is the first surface 11A as in the electric blower 1. Smaller than the entrance installation angle at the other cross section away from

As shown in FIG. 6, consider the first tangent TFA and the ninth tangent T4 for the first part 12A. The first tangent TFA is a tangent of the first center line CLA of the first portion 12A, which passes through the first end portion FEA. The ninth tangent T4 is a tangent of a fifth arc CI4 passing through the first end FEA and passing through the first end FEA around the rotation center O. The first tangent TFA and the ninth tangent T4 form a third inlet setting angle θ _IA on the first cross section.

As shown in FIG. 6, consider the third tangent line TFB and the tenth tangent line T5 in relation to the second part 12B. The third tangent TFB is a tangent of the second center line CLB of the second portion 12B, which passes through the third end FEB. The tenth tangent T5 is a tangent of a sixth arc CI5 that passes through the third end FEB and that passes through the third end FEB about the rotation center O. The third tangent TFB and the tenth tangent T5 form a fourth inlet setting angle θ _IB on the second cross section.

As shown in FIG. 6, regarding the first portion 12A, consider the fifth tangent line TBA and the eleventh tangent line T6. The fifth tangent line TBA is a tangent to the first center line CLA passing through the second end BEA. An eleventh tangent line T6 is a line of a seventh arc CI6 that passes through the second end BEA and that is centered on the rotation center O and that passes through the second end BEA. The fifth tangent line TBA and the eleventh tangent line T6 form a third outlet installation angle θ _OA on the first cross section.

As shown in FIG. 6, regarding the second part 12B, consider a seventh tangent line TBB and a twelfth tangent line T6. The seventh tangent line TBB is a tangent to the second center line CLB passing through the fourth end BEB. The twelfth tangent line T6 is a tangent line of an eighth arc CI6 passing through the fourth end BEB and passing through the fourth end BEB centered on the rotation center O. The twelfth tangent line is indicated by T6 in FIG. 6 because it overlaps with the eleventh tangent line T6 when viewed in the extension direction. The eighth arc overlaps with the seventh arc CI6 when viewed in the extension direction, and thus is denoted by CI6 in FIG. The seventh tangent line TBB and the twelfth tangent line form a fourth outlet setting angle θ _OB on the second cross section.

As shown in FIG. 6, each of the plurality of vanes 12 is configured such that the third inlet installation angle θ _IA is smaller than the fourth inlet installation angle θ _IB . Each of the plurality of vanes 12 is configured such that the third outlet installation angle θ _OA is smaller than the fourth outlet installation angle θ _OB . In the plurality of vanes 12, the second end BEA and the fourth end BEB of the plurality of vanes 12 are formed to overlap in the extending direction. In the plurality of vanes 12, the first end FEA is formed rearward of the third end FEB in the rotational direction and outward in the radial direction.

  Therefore, the electric blower according to the second embodiment can achieve the same effect as the electric blower 1.

Third Embodiment
An electric blower according to Embodiment 3 will be described with reference to FIGS. 7 and 8. The motor-driven blower according to Embodiment 3 basically has the same configuration as the motor-driven blower 1 according to Embodiment 1, but the cross-sectional shape of the plurality of stator blades 12 perpendicular to the extending direction is the same as that of the motor-driven blower 1. It is different from that.

  As shown in FIGS. 7 and 8, in the cross section perpendicular to the extending direction, the center of curvature of one outline of each of the plurality of vanes 12 in the rotation direction of each of the plurality of vanes 12 is greater than the other Located on the outline side of. In the cross section, the center of curvature of the other outline in the rotational direction of each of the plurality of vanes 12 is located closer to the one outline than the other outline.

  For example, the center of curvature of the outline A1 located forward in the rotational direction of the first portion 12A is located rearward of the outline A1 in the rotational direction. The center of curvature of the outline B1 located forward in the rotational direction of the second portion 12B is located more rearward than the outline B1 in the rotational direction. In other words, the surface located forward in the rotational direction of the plurality of stator blades 12 and extending from the inner peripheral end to the outer peripheral end is formed to be convex forward in the rotational direction.

  The center of curvature of the outline A2 positioned rearward in the rotational direction of the first portion 12A is positioned forward of the outline A2 in the rotational direction. The center of curvature of the outline B2 positioned rearward in the rotational direction of the second portion 12B is located forward of the outline B2 in the rotational direction. In other words, the surface that is located rearward in the rotational direction of the plurality of vanes 12 and extends from the inner circumferential end to the outer circumferential end is formed to be convex rearward in the rotational direction. The distance between the outline located forward in the rotational direction of the vane 12 and the outline located behind it, in other words, the thickness of the vane 12, is the largest at the central portion in the radial direction.

  In this way, the flow of gas as shown by the dotted arrow and the solid arrow in FIG. 8 is realized. Thereby, in the electric blower according to the third embodiment, the center of curvature of the outline A1 located forward in the rotation direction of the first portion 12A is located forward in the rotation direction than the outline A1. As compared with the case (see FIG. 3), the occurrence of flow separation on the outlet side (outer periphery side) of the flow path formed between the plurality of vanes 12 is suppressed. As a result, in the electric blower according to the third embodiment, the ventilation resistance of the flow path formed between the plurality of stator blades 12 is reduced, and the rate of increase in static pressure is increased, so the efficiency is high.

Fourth Embodiment
An electric blower according to a fourth embodiment will be described with reference to FIGS. 9 to 12. The electric blower according to the fourth embodiment basically has the same configuration as the electric blower 1 according to the first embodiment, but the change rate of the inlet installation angle of each of the plurality of stator blades 12 is the extension direction It differs in the point which is different according to the position in. The horizontal axis in FIG. 9 indicates the positions of the plurality of stator blades 12 in the extending direction, and the vertical axis in FIG. 9 indicates the inlet installation angle at the positions. The horizontal axis in FIG. 10 indicates the positions of the plurality of vanes 12 in the extending direction, and the vertical axis in FIG. 10 indicates the outlet installation angle at the positions.

  The rate of change of the inlet installation angle is shown as the slope of the graph in FIG. For example, the rate of change of the inlet installation angle between the first cross section and the third cross section corresponds to the ratio of the distance between the first cross section and the third cross section in the extension direction on the first cross section. It is calculated as the ratio of the difference between the inlet installation angle at the position and the inlet installation angle on the third cross section.

  The change in the rate of change of the inlet installation angle is shown as a change in the slope of the graph in FIG. For example, the rate of change of the inlet installation angle between the third cross section and the second cross section corresponds to the third cross section with respect to the distance between the third cross section and the second cross section in the extension direction. It is calculated as the ratio of the difference between the inlet installation angle at the second and the inlet installation angle on the second cross section. The rate of change of the inlet installation angle between the third cross section and the second cross section is different from the rate of change of the inlet installation angle between the first cross section and the third cross section.

  The rate of change of the inlet installation angle is set based on the velocity distribution shown in FIG. For example, the rate of change of the inlet installation angle on the side closer to the first surface 11A in the extension direction is larger than the rate of change of the inlet installation angle on the side farther from the first surface 11A in the extension direction. For example, the rate of change of the inlet installation angle between the first cross section and the third cross section is larger than the rate of change of the inlet installation angle between the third cross section and the second cross section. By setting the rate of change of the inlet installation angle based on the velocity distribution, the collision loss at the inner peripheral end of the stationary blade 12 can be more effectively reduced.

  The rate of change of the outlet installation angle is shown as the slope of the curve-like graph in FIG. For example, the rate of change of the outlet installation angle between the first cross section and the third cross section is on the first cross section with respect to the distance between the first cross section and the third cross section in the extension direction. It is calculated as the ratio of the difference between the outlet installation angle at the second and the outlet installation angle on the third cross section.

  The change in the rate of change of the outlet installation angle is shown as a change in the slope of the graph in FIG. For example, the rate of change of the outlet installation angle between the third cross section and the second cross section is different from the rate of change of the outlet installation angle between the first cross section and the third cross section.

  The rate of change of the outlet installation angle is set based on the velocity distribution shown in FIG. For example, the rate of change of the outlet installation angle on the side closer to the first surface 11A in the extension direction is larger than the rate of change of the outlet installation angle on the side farther from the first surface 11A in the extension direction. For example, the rate of change of the outlet installation angle between the first cross section and the third cross section is larger than the rate of change of the outlet installation angle between the third cross section and the second cross section. By setting the rate of change of the outlet installation angle based on the velocity distribution, the ventilation resistance in the gap 21 can be more effectively reduced.

The electric blower according to Embodiment 4 having the above-described configuration has high efficiency.
The tendency of the change of the rate of change of the inlet installation angle and the tendency of the change of the rate of change of the outlet installation angle may be arbitrarily set according to the velocity distribution.

  The change rate of the inlet installation angle on the side closer to the first surface 11A in the extension direction may be smaller than the change rate of the inlet installation angle on the side farther from the first surface 11A in the extension direction. In this case, the portion of the stationary blade 12 located on the inner peripheral side in the radial direction has a cross-sectional shape as shown in FIG. The rate of change of the outlet installation angle on the side closer to the first surface 11A in the extension direction may be smaller than the rate of change of the outlet installation angle on the side farther from the first surface 11A in the extension direction. In this case, the portion of the vane 12 located on the outer peripheral side in the radial direction has a cross-sectional shape as shown in FIG.

Embodiment 5
<Configuration of Vacuum Cleaner>
Fifth Embodiment A vacuum cleaner 100 according to a fifth embodiment will be described with reference to FIG. The vacuum cleaner 100 is provided with at least one of the electric blowers according to the first to third embodiments. The vacuum cleaner 100 includes, for example, a vacuum cleaner main body 101, a suction tool 104, a dust collection unit 105, and the electric blower 1 described above. A discharge port 107 is provided in the vacuum cleaner body 101. The suction tool 104 is connected to the vacuum cleaner main body 101 by a hose 102 as a pipe and an extension pipe 103 and sucks the air of the portion to be cleaned. The hose 102 is connected to the vacuum cleaner body 101. The extension pipe 103 is connected to the tip end of the hose 102. The suction tool 104 is connected to the tip of the extension pipe 103.

  The dust collection unit 105 is provided inside the vacuum cleaner main body 101, communicates with the suction tool 104, and stores dust of the sucked air. The electric blower 1 is provided inside the vacuum cleaner main body 101 and sucks air from the suction tool 104 to the dust collection unit 105. The electric blower 1 is an electric blower according to the embodiment of the present invention described above. The discharge port 107 is provided at the rear of the vacuum cleaner body 101 and discharges the air collected by the dust collection unit 105 to the outside of the vacuum cleaner body 101.

  A rear wheel 108 is disposed on the rear side in the traveling direction on the side of the vacuum cleaner body 101. At the lower part of the vacuum cleaner body 101, a front wheel (not shown) is provided on the front side in the traveling direction.

<Operation of the vacuum cleaner>
The operation of the vacuum cleaner will now be described with reference to FIG. In the electric vacuum cleaner configured as described above, when electric power is supplied to the electric motor 2 of the electric blower 1, the shaft 5 (see FIG. 1) rotates. As shown in FIG. 1, when the shaft 5 rotates, the centrifugal impeller 6 fixed to the shaft 5 rotates and sucks air from the suction port 17. Thereby, the air of the surface to be cleaned is sucked by the vacuum cleaner body 101 through the hose 102, the extension pipe 103, and the suction tool 104 connected to the vacuum cleaner body 101 shown in FIG. The air drawn into the vacuum cleaner body 101 is collected by the dust collection unit 105.

  Thereafter, the air discharged from the dust collection unit 105 is drawn from the suction port 17 of the electric blower 1, as shown in FIG. The air drawn into the electric blower 1 is boosted and accelerated by the centrifugal impeller 6 and travels radially outward while turning. Most of the air discharged from the centrifugal impeller 6 is decelerated and boosted between the plurality of vanes 12. Thereafter, the air is discharged from the discharge port 16 and the discharge port 20 to the outside of the electric blower 1. Then, air is discharged to the outside of the vacuum cleaner main body 101 from the discharge port 107 provided in the vacuum cleaner main body 101 shown in FIG.

<Functional effect of vacuum cleaner>
Since the above-described vacuum cleaner 100 uses the above-described high-efficiency electric blower 1, it is possible to obtain a vacuum cleaner with a high suction work rate.

  In addition, the vacuum cleaner 100 may be equipped with the electric blower which concerns on Embodiment 2-4. Also in this case, the suction work rate of the vacuum cleaner 100 can be increased.

  In addition, although the vacuum cleaner 100 demonstrated the canister type with which the hose 102 and the extension pipe 103 were connected to the vacuum cleaner main body 101, another type of vacuum cleaner may be used. For example, the electric blower according to any one of the first to fourth embodiments described above may be applied to a cordless type vacuum cleaner whose extension pipe is connected to a vacuum cleaner body or a stick type vacuum cleaner. it can.

Sixth Embodiment
<Configuration of hand dryer>
Next, a hand dryer 110 according to the fifth embodiment will be described with reference to FIG. The hand dryer 110 includes at least one of the electric blowers according to the first to third embodiments. The hand drier 110 includes, for example, the electric blower 1, a casing 111 as a main body, a hand insertion portion 112, a water receiving portion 113, an air inlet 114, and a nozzle 115. The hand dryer includes the electric blower 1 in the casing 111. In the hand dryer, the hand is inserted into the hand insertion portion 112 at the top of the water receiving portion 113 so that the water is blown away from the hand by air blowing from the electric blower 1. The blown water is stored from the water receiver 113 into a drain container (not shown).

  A casing 111 forming an outer shell of the hand dryer has a hand insertion port at the front. The casing 111 includes a hand insertion unit 112 as a processing space following the hand insertion opening. A user can insert a hand into the hand insertion unit 112. The hand insertion portion 112 is formed at the lower front of the casing 111 as an open sink-like recess whose front and both side surfaces are open. The water receiving part 113 is arrange | positioned so that the lower part of the hand insertion part 112 may be formed. At an upper portion of the hand insertion portion 112, a nozzle 115 for blowing high speed air downward toward the hand insertion portion 112 is provided. An intake port 114 is provided on the lower surface of the casing 111.

  In the internal space of the casing 111, the electric blower 1 is disposed. The electric blower 1 is driven by, for example, power supplied from the outside or power from a power source such as a battery disposed inside the casing 111. Further, in the space, an intake air passage communicating the intake side of the electric blower 1 with the intake port 114 provided on the side surface of the casing 111 and an exhaust air flow communicating the exhaust side of the electric blower 1 with the nozzle 115 A road is provided.

  A heater may be provided in the vicinity of the upstream side of the nozzle 115 in the middle of the exhaust air path, for heating the air exhausted from the electric blower 1 to warm it. In addition, a circuit board provided with a hand detection sensor and an illumination LED may be provided in the casing 111 on the rear side of the nozzle 115 as the blowout port. The hand detection sensor detects the presence or absence of the hand of the hand insertion unit 112. When it is detected that a hand has been inserted into the hand insertion portion 112, the illumination LED as the illumination means illuminates the hand insertion portion 112 and makes it bright.

<Operation of hand dryer>
Next, the operation at the time of use in which the hands are dried will be described. When the power switch of the electric device as the hand dryer is turned on, the control circuit or the like disposed in the casing 111 is energized, and it becomes an available state (hereinafter referred to as a standby state) in which hand drying can be performed. Then, when the user puts the wet hand into the hand insertion portion 112 from the hand insertion opening to the vicinity of the wrist, the hand detection sensor detects the insertion of the hand. As a result, the control circuit operates the electric blower.

  When the electric blower 1 operates, air outside the hand dryer is drawn from the air inlet 114. The air drawn from the air inlet 114 is drawn to the suction side of the electric blower 1. The electric blower 1 converts air sucked from the intake side into high-pressure air from the exhaust side and exhausts the air. The exhausted high pressure air passes through the exhaust air passage and reaches the nozzle 115, and is converted into a high velocity air flow having high kinetic energy. The high velocity air stream is blown downward from the nozzle 115 into the hand insertion portion 112. The high-speed air flow blown out from the nozzle 115 hits the wet hand inserted in the hand insertion portion 112, and the moisture adhering to the hand is peeled off from the surface of the hand and blown off. In this way, the hands can be dried. When the heater switch (not shown) provided in the casing 111 is turned on, the heater is energized and the high pressure air passing through the exhaust air passage is heated. For this reason, warm air is blown out from the nozzle, and the user's feeling of use can be kept good even in the winter season and the like.

  After the hand is dried, when the hand is pulled out of the hand insertion unit 112, the hand detection sensor detects that the hand is pulled off, and the electric blower stops. The water droplets blown off from the hand are accommodated in the water receiver 113 of the forward tilt structure.

<Function and effect of hand dryer>
The above-described hand dryer 110 uses the above-described high-efficiency electric blower 1 and therefore has high efficiency.

  The hand dryer 110 may include the electric blower according to the second to fourth embodiments. Even in this case, the hand dryer 110 is highly efficient.

  Although the embodiments of the present invention have been described above, various modifications of the above-described embodiments are possible. Further, the scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be advantageously applied to household or commercial vacuum cleaners, hand dryers, and other devices using centrifugal electric blowers.

  Reference Signs List 1 electric blower, 2 motor unit, 3 rotor, 4 stator, 5 shaft, 6 centrifugal impeller, 7 hub, 8 moving blade, 10 diffuser, 11 main plate, 11A first surface, 11B second surface, 12 stator blade, 12A 1st part, 12B 2nd part, 13 return vanes, 14 fan covers, 15 brackets, 16 discharge ports, 17 suction ports, 18 bell mouths, 19 motor frames, 20 discharge ports, 21 gaps, 100 electric vacuum cleaners, 101 Electric vacuum cleaner body, 102 hose, 103 extension pipe, 104 suction tool, 105 dust collection part, 107 discharge port, 108 rear wheel, 110 hand dryer, 111 casing, 112 hand insertion part, 113 water receiving part, 114 air intake port, 115 nozzles.

Claims (10)

An electric motor including an electric motor and a rotating shaft rotated by the electric motor;
A centrifugal impeller connected to the rotating shaft;
A main plate disposed between the motor and the centrifugal impeller;
And a plurality of stator vanes formed to surround the centrifugal impeller in a direction intersecting the extending direction of the rotation shaft,
The main plate has a first surface extending in the intersecting direction and located on the centrifugal impeller side in the extending direction,
Each of the plurality of vanes is connected to the first surface,
The center line of each of the plurality of stator blades in a cross section perpendicular to the extending direction has an inner peripheral end located closest to the rotation axis and an outer peripheral end located farthest from the rotation axis. And
Each of the plurality of stator blades has a tangent of the center line passing through the inner peripheral end and a tangent of an arc passing through the inner peripheral end about the rotation axis passing through the inner peripheral end. Have an inlet installation angle on the cross section,
In each of the plurality of vanes, the inlet installation angle on the first cross section perpendicular to the extending direction is at a position farther from the first surface than the first cross section, and in the extending direction An electric blower smaller than the inlet installation angle on a vertical second cross section. Each of the plurality of stator blades has a tangent of the center line passing through the outer peripheral end and a tangent of an arc passing through the outer peripheral end about the rotation axis passing through the outer peripheral end on the cross section Have an outlet installation angle,
The electric blower according to claim 1, wherein the outlet installation angle on the first cross section is smaller than the outlet installation angle on the second cross section in each of the plurality of stator blades.   The outer shape according to claim 1 or 2, wherein, in a cross section perpendicular to the extending direction, one outline and the other outline of the centrifugal impeller in the rotational direction of each of the plurality of vanes are substantially arc-shaped. Electric blower. The center of curvature of the one outline is located closer to the other outline than the one outline,
The electric blower according to claim 3, wherein a curvature center of the other outline is located closer to the one outline than the other outline.   The electric blower according to any one of claims 1 to 4, wherein an outer shape of the main plate is substantially circular when viewed from the extending direction.   The electric blower according to any one of claims 1 to 5, wherein an outer diameter of the plurality of stator blades is larger than an outer diameter of the main plate.   In each of the plurality of vanes, the inlet installation angle on a third cross section, which is located between the first cross section and the second cross section and is perpendicular to the extending direction, is on the first cross section. The electric blower according to any one of claims 1 to 6, wherein the inlet installation angle is greater than the inlet installation angle on the second cross section.   The ratio of the difference between the inlet installation angle on the first cross section and the inlet installation angle on the third cross section to the distance between the first cross section and the third cross section in the extension direction is The ratio of the difference between the inlet installation angle on the third cross section and the inlet installation angle on the second cross section to the distance between the third cross section and the second cross section in the extending direction is different. An electric blower according to Item 7. The vacuum cleaner body,
A suction tool connected to the vacuum cleaner main body by a pipe and suctioning the air of the portion to be cleaned;
A dust collection unit provided inside the vacuum cleaner main body, communicating with the suction tool, and storing dust of the sucked air;
The electric blower according to any one of claims 1 to 8, which is provided inside the vacuum cleaner body and sucks air from the suction tool to the dust collection unit,
The electric vacuum cleaner main body is provided with the discharge port which discharges the air after the dust collection by the said dust collection part outside the said vacuum cleaner main body outside the said vacuum cleaner main body. A body including a hand insertion portion which is an opening through which a user inserts a hand;
The electric blower according to any one of claims 1 to 8, provided inside the main body,
The hand dryer includes an air inlet for the electric blower to take in the outside air, and an outlet for blowing the air from the electric blower to the hand insertion portion, the body being formed with the air outlet. .

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