JP2733419B2 - Electric blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower used in a vacuum cleaner of a wet and dry type vacuum cleaner.

[0002]

2. Description of the Related Art An electric blower for a wet-and-dry type vacuum cleaner has a centrifugal blower for sucking air and the like containing water at one end of a rotor shaft and blowing the air, and the other end of the rotor shaft. A cooling fan for sending air for cooling the stator and the rotor is attached to the section. This type of electric blower is known from Japanese Utility Model Publication No. Sho 59-1644 and Japanese Patent Laid-Open Publication No. Sho 57-122835.

[0003] As shown in these publications, conventionally, a large number of exhaust holes are formed in the circumferential wall of a fan cover provided over the blower fan at intervals in the circumferential direction. The air discharged from the blower fan is discharged to the outside of the cover peripheral wall so that the stator and the rotor are not exposed to air containing water.

[0004]

Since the outlet of the blower fan and the cover peripheral wall of the fan cover are closely opposed to each other, the air discharged from the blower fan is discharged through the cover peripheral wall as described above. In the conventional configuration, there is a problem that a loud wind noise is generated because a high-speed wind having good momentum immediately after being discharged from the blower fan directly passes through the exhaust hole.

Further, in the electric blower, an annular support rubber is fitted on an outer surface of a corner formed by a portion where a cover peripheral wall of the fan cover and a cover end wall are connected, and the fan is supported via the rubber. Has become. Therefore, in the conventional configuration in which there is only one blower fan and the exhaust hole is formed in the peripheral wall of the fan cover, the fitting depth of the support rubber to the corner portion so that the support rubber does not block the exhaust hole. It needs to be shallow.

[0006] Therefore, the mounting state of the support rubber becomes unstable, and the support rubber is easily dropped when the electric blower is incorporated into the main body of the vacuum cleaner, which is inconvenient in assembling. Therefore, in the related art, the fan is multi-staged to increase the axial size of the fan cover, thereby securing a large fitting depth of the support rubber with respect to the corner portion and closing the exhaust hole with the rubber. Have been forced to not. Therefore, this type of conventional electric blower also has a problem that its dimension in the axial direction is long.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric blower which can reduce wind noise caused by a blowing operation, can reduce an axial dimension, and can reduce a rise in temperature.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a centrifugal fan is mounted on one end of a rotor shaft of a rotor disposed inside a stator, and the stator and the stator are mounted on the other end of the rotor shaft. A cooling fan for cooling the rotor was mounted, a fan cover mounting wall surrounding the stator and extending outward was provided on the blower fan side, and a fan cover for covering the blower fan was mounted on the mount wall. Applies to electric blowers. And
In order to achieve the above object, an air path partition having an annular partition wall abutting on the surface of the fan cover mounting wall on the side of the blower fan is disposed between the fan cover mounting wall and the blower fan, On the fan cover mounting wall, a cooling exhaust unit that exhausts air blown by the cooling fan in the axial direction of the rotor shaft is provided inside the annular partition wall, and the air discharged from the blower fan is blown by the rotor. A blower / discharge unit for discharging air in the axial direction of the shaft is provided outside the annular partition wall.

[0009]

In the structure of the present invention, the blower exhaust portion is provided not on the peripheral wall of the fan cover but on the fan cover mounting wall which surrounds the stator and extends outward. Long distance between them can be secured. Then, the fan cover receives the wind discharged in the centrifugal direction from the discharge port on the inner surface of the peripheral wall of the cover, and changes the direction of the wind toward the blower / exhaust unit. The air is discharged in the axial direction of the rotor through the wind. For this reason, the high-speed high-speed wind does not pass directly through the ventilation and exhaust unit, and the wind can be killed and passed through the ventilation and exhaust unit. Further, since the blower exhaust section is provided on the fan cover mounting wall, the blower exhaust section is not blocked by the support rubber fitted to the outside of the fan cover. Further, the cooling exhaust portion provided on the fan cover mounting wall is formed by the rotation of the cooling fan, cools the stator portion, and allows the cooling air flowing around the blower fan side portion of the stator winding to pass through in the axial direction of the rotor. To be discharged.
In addition, the air path partition body prevents the air blown by the rotation of the blower fan and the cooling air blown by the rotation of the cooling fan from mixing inside the fan cover and disturbing each other,
The annular partition wall guides the blowing air and the cooling air toward the respective corresponding exhaust portions in the axial direction of the rotor shaft.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The motor frame denoted by reference numeral 1 in FIGS. 1, 4 and 9 is made of metal, and has an end wall 3 that closes one end (upper end in FIG. 1) of a cylindrical wall 2 as a first motor frame. And the other end (the lower end in FIG. 1) of the cylindrical wall 2 is opened, and a fan cover mounting wall 4 is integrally provided to protrude outward from an edge of the opening. As shown in FIGS. 1 and 4, a bearing mounting portion 5 is formed integrally with the center portion of the end wall 3.
A plurality of cooling through-holes 6 are formed in the end wall 3 at the periphery of.

As shown in FIG. 1, the opening of the cylindrical wall 2 has a diameter gradually increasing toward the fan cover mounting wall 4 and is continuous with the fan cover mounting wall 4. The fan cover mounting wall 4 is formed by bending an overhanging peripheral portion 4b at the peripheral edge of the overhanging plate portion 4a and bending an overhanging edge portion 4c at the tip of the peripheral portion 4b. The projecting plate portion 4a projects outward so as to be orthogonal to the cylindrical wall 2. The overhang peripheral portion 4b is substantially parallel to the cylindrical wall 2 and extends in the direction of the end wall 3, and the overhang edge 4c is provided in parallel with the overhang plate portion 4a.

As shown in FIG. 3, a frame end plate 7 made of sheet metal as a second motor frame is laid on the overhanging plate portion 4a. The end face plate 7 has a shape crossing the opening of the cylindrical wall 2 in the radial direction, and forms an electric motor frame together with the electric motor frame 1. The frame end face plate 7 is positioned by inserting the bending claws 7a at both ends in the longitudinal direction into a plurality of long holes 8 provided in the overhang plate portion 4a as shown in FIG. Are attached to the fan cover mounting wall 4 by screwing screws 10 (see FIG. 3) passing through both ends in the length direction of the frame end face plate 7 into a plurality of screw holes 9 provided in the vicinity of. .

A bearing mounting portion 11 is integrally formed at the longitudinal center of the frame end face plate 7. Although 7b in FIG. 3 may be omitted in the present invention, it is a hole provided for reducing the weight in the present embodiment. Further, the frame end face plate 7 is inclined so as to gradually move away from the opening of the cylindrical wall 2 as it goes from both ends to the bearing attachment portion 11, but this inclination is not necessary in the present invention.

The motor frame 1 has a built-in stator 15. Therefore, the stator 15 is surrounded by the fan cover mounting wall 4. This stator 15 has a stator winding 16 having a pair of salient poles 16a (see FIG. 8) of a stator core 16 made of silicon steel plates laminated as shown in FIGS. 17 are attached to each other.

The stator core 16 has a substantially square outer diameter when viewed from the end face direction, and the four corner outer surfaces are formed by curved surfaces along the inner peripheral surface of the cylindrical wall 2. The stator 15 has four corner outer surfaces in contact with the inner peripheral surface of the cylindrical wall 2, and is press-fitted into the cylindrical wall 2 from the opening side to be stored and fixed.

A pair of closing plates 18 are sandwiched between an end surface of the stator core 16 located on the opening side of the cylindrical wall 2 and the pair of stator windings 17, respectively. These closing plates 1
8 together form a circular outer periphery, which is in contact with the inner peripheral surface of the cylindrical wall 2. Thereby, the pair of closing plates 18 close the gap G between the flat outer surface between the corners of the stator core 16 and the inner peripheral surface of the cylindrical wall 2 from the opening side of the cylindrical wall 2.

The construction of the closing plate 18 is shown in FIGS. That is, the closing plate main portion 61 having a substantially arc-shaped peripheral end surface 61a along the inner peripheral surface of the cylindrical wall 2 includes a cooling fan side portion 17a of the stator winding 17 and a rotor 21 to be described later.
A recess 62 is formed through which the hole passes. The first and second portions are provided on both sides of the closing plate main portion 61 sandwiching the recess 62.
The engaging protrusions 63 and 64 are separately and integrally protruded from each other, and a slanting tongue 65 is integrally provided on the engaging protruding piece 63 side. The first engaging protrusion 63 is formed so as to slightly rise on one surface side of the closing plate main portion 61 to form a step, and the second engaging protrusion 64 is slightly raised on the other surface side of the closing plate main portion 61. It is formed so as to form a step. Each of the engaging projections 63 and 64 is formed with a rectangular engaging hole 66. Further, diagonal first and second hook pieces 67 and 68 are cut and raised in opposite directions to the both side portions of the closing plate main portion 61, respectively.

The first and second engaging projections 63, 6 are arranged so that the closing plate main portion 61 overlaps the end face of the stator core 16 on the blower fan side from the outside of the stator 15.
4 is inserted first, the stator core 16
And a cooling fan side portion 17 a of the stator winding 17. In addition, in this insertion, the pair of closing plates 18 are mounted so that the center of the rotor 21 is point-symmetrically arranged.

As a result, as shown in FIG. 8, the engaging hole 66 of the first engaging projection 63 of the one closing plate 18 and the second engaging piece 68 of the other closing plate 18 are engaged. With
Engagement hole 66 of the second engagement projection 64 of the one closing plate 18
And the first latching piece 67 of the other closing plate 18 is engaged, and the oblique tongues 65 of both closing plates 18 overlap with the corresponding one surface of the closing plate main part 61, so that the two closing plates 18 are Linked to each other.

Inside the stator 15, a rotatable rotor 21 penetrating therethrough is arranged. Both ends of the rotor shaft 22 of the rotor 21 are separately supported by bearings 23 and 24 incorporated in the bearing mounting portions 5 and 11, respectively, and penetrate both bearings 23 and 24. As shown in FIG. 1, a cooling passage 25 is provided between the outer peripheral surface of the rotor 21 and the inner peripheral surface of the stator core 16 facing each other.
Are formed. The closing plate 18 does not close the cooling passage 25.

A commutator 26 is mounted on the rotor shaft 22. At two locations corresponding to the radial direction of the cylindrical wall 2, brush devices 27 are respectively mounted so as to penetrate the cylindrical wall 2.
Brushes (not shown) provided in these devices 27 are commutators 26.
Are pressed against the outer peripheral surfaces arranged in the circumferential direction. In addition, the motor frame body including the motor frame 1 and the frame end face plate 7, the stator 1
5, the closing plate 18, the rotor 21, the commutator 26, and the brush device 27 constitute an electric motor portion of the electric blower of the present embodiment.

A motor holder 31 made of a synthetic resin is attached to the end wall 3 of the motor frame 1. The holder 31 includes a cylindrical wall cover 32 having an escape portion for the brush device 27 and the like and fitted on the outer periphery of the cylindrical wall 2, a cylindrical holder 33 having a smaller diameter than the cover 32, Step 3 that connects the spaces together and contacts the outer peripheral surface of the end wall 3
4.

The holder portion 33 has two mounting projections (not shown) on its inner side. These mounting projections are formed on two screw receiving projections 3a (see FIG. 4) formed on the end wall 3 at two locations. It comes into contact. And these screw receiving projections 3a
Concave portion 33a provided on the outer surface of holder portion 33 corresponding to
The motor holder 31 is fixed to the motor frame 1 by screwing these screws 35 into the screw holes 36 (see FIG. 4) of the screw receiving projections 3a through the mounting screws 35 (see FIG. 2).

One end (upper end in FIG. 1) of the rotor shaft 22 penetrating through the bearing mounting portion 5 and the bearing 23 is located at the center of the inside of the cylindrical holder portion 33. A shaped cooling fan 37 is fixed. In addition,
Numeral 38 is a nut for fixing the fan. This cooling fan 3
The periphery of 7 is surrounded by the inner peripheral surface of the cylindrical holder 33, and the air blown by the cooling fan 37 is guided by the inner surface of the electric motor holder 31 and is guided to the cooling through hole 6.

At the other end (lower end in FIG. 1) of the rotor shaft 22 penetrating through the bearing mounting portion 11 and the bearing 24, one sheet metal blower fan 41 is mounted via a nut 42. The blower fan 41 has a suction port 4 at the center.
1a, and has a discharge port 41b on the periphery, and discharges air sucked from the suction port 41a.
This is a centrifugal type that discharges from b in the centrifugal direction.

As shown in FIG. 1, the blower fan 41 is covered with a fan cover 43 made of sheet metal. The fan cover 43 is formed by integrally connecting a cover end wall 43b to a lower end of a cylindrical cover peripheral wall 43a in FIG. 1 and providing an intake port 44 at a central portion of the wall 43b in close proximity to the intake port 41a. ing. This fan cover 43
Is fitted to the fan cover mounting wall 4 by fitting an upper end opening (in FIG. 1) of the cover peripheral wall 43a to the overhanging edge 4c of the fan cover mounting wall 4. By this attachment, the inner surface of the cover peripheral wall 43a and the blower fan 4
The first discharge port 41b is opposed to the first discharge port 41b.

In the fan cover 43, between the blower fan 41 and the fan cover mounting wall 4, an air passage partition 45 made of synthetic resin for covering the opening of the motor frame 1 is arranged. The partition body 45 has a diameter larger than that of the blower fan 41, and includes a disk-shaped base wall 46 facing the fan 41 and an annular partition wall 47 integrally protruded from a peripheral portion of the base wall 46. Is formed.

In FIG. 1, reference numerals 46a and 46b denote base walls 4.
6, a pair of inner and outer rectifying blades that are integrally protruded from the periphery of the cover wall 43b in the direction of the cover wall 43b and are in contact with the inner surface of the cover wall 43b.
The rectifying blades 46a and 46b form an arc shape when viewed from the cover wall 43b side, form a rectifying air passage between each other, and are provided in a large number so as to surround the blower fan 41. The rectifying air passage is formed so as to gradually increase the cross-sectional area of the air passage from the inlet on the discharge port 41b side to the outlet on the cover peripheral wall 43a side, and rectifies the air discharged from the blower fan 41. You will be guided while doing so. In the present invention, the rectifying blades 46a and 46b forming the rectifying air passage may be omitted.

The center of the base wall 46 is the frame end plate 7.
Is fitted outside the bearing mounting portion 11. The base wall 46 is attached to the frame end face plate 7 by the bearing mounting portion 11.
Is fixed to the frame end face plate 7 through a screw 48 (see a two-dot chain line in FIG. 3) which is screwed into a screw hole 7c (see FIG. 3) provided in the vicinity of the frame end face plate 7. Annular partition 47
Are projected in the axial direction of the rotor 21, and the outer peripheral surface thereof faces the inner surface of the cover peripheral wall 43 a of the fan cover 43. Further, the distal end surface of the annular partition wall 47 is connected to the blower fan 4 at the overhanging plate portion 4a of the fan cover mounting wall 4.
It is in contact with the surface on one side. In addition, a concave portion (not shown) that fits into both end portions 7d in the longitudinal direction of the frame end face plate 7 is provided at the distal end portion of the partition wall 47.

The overhang plate portion 4 of the fan cover mounting wall 4
As shown in FIGS. 1 to 4, a is provided with a plurality of first exhaust holes 49 as a plurality of blower exhaust units and a plurality of second exhaust holes 50 as a plurality of cooling air exhaust units. I have. Each first exhaust hole 49 is formed in a portion located outside the annular partition wall 47 with respect to the overhang plate portion 4a,
Each second exhaust hole 50 is formed at a portion located inside the annular partition wall 47 with respect to the overhang plate portion 4a.

The passage area of the first exhaust hole 49 is equal to the second exhaust hole 5.
0 is larger than the passage area. As shown in FIG. 3, the first exhaust hole 49 and the second exhaust hole 50 are provided on both sides in the width direction of the frame end face plate 7 in correspondence with the blower fan side portions 17a of the pair of stator windings 17, respectively. Have been.

The electric blower FM having the above-described structure is provided in a main body case of a wet and dry type vacuum cleaner as shown in FIG.
As shown in the figure, the cooling fan 37 is
1 is built in so as to be located below. The cooling fan 37 side of the electric blower FM is supported by the rib 52 of the main body case via a support rubber 51 fitted to the outside of the holder portion 33 of the electric motor holder 31, and the blower fan of the electric blower FM The 41 side is supported by the ribs 54a and 54b of the main body case via a support rubber 53 fitted outside the corner formed by the cover peripheral wall 43a of the fan cover 43 and the fan cover end wall 43b.

In FIG. 9, reference numeral 55 denotes a partition wall of the main body case.
An exhaust passage 57 is formed between the cylindrical wall 2 and the rib 54a by contacting the outer surface of the cylindrical wall 2. The exhaust air path 57 prevents wind containing water from flowing to the brush device 27 side.

When the electric blower FM having the above configuration is operated, the cooling fan 37 and the blower fan 41 are rotated together with the rotor 21. Therefore, the wind sent in the axial direction by the rotation of the cooling fan 37 causes the electric motor frame 1 to rotate.
And flows into the motor frame 1 so as to be blown to the cooling fan side portion 17 b of the stator winding 17 through the cooling through hole 6. This wind generates the cooling passage 2 between the stator 15 and the rotor 21 by the structure in which the closing plate 18 that closes the gap G between the stator 15 and the motor frame 1 is attached to the stator 15.
5, the stator 15 and the rotor 21 are cooled. And the wind that passed through the cooling passage 25
The air is guided to the inner surface of the air passage partitioning body 45, passes through the second exhaust hole 50 formed in the overhang plate portion 4 a of the fan cover mounting wall 5, and is discharged to the exhaust air passage 57 outside the motor frame 1. Moreover, in guiding the cooling air in the air passage partition 45, the cooling passage 25 is positioned between the pair of stator windings 17, and the second exhaust hole 50 is
Is provided at an outer position so as to sandwich the blower fan side portion 17a between the cooling passage 25 and the cooling air passing through the cooling passage 25. And reaches the second exhaust hole 50. The flow of the cooling air generated as described above is indicated by a dotted arrow in FIG.

Therefore, the rise in the temperature of the electric motor can be reduced by the cooling air. That is, after the cooling air is blown to the blower fan side portion 17b of the stator winding 17 as described above, the cooling air is not only concentratedly passed through the cooling air passage 25 but also blower fan side portion 17a of the stator winding 17. The cooling air can flow along the
5 and the rotor 21 can be effectively air-cooled, and the temperature rise of the motor unit can be reduced.

On the other hand, by the rotation of the blower fan 41, a flow of blown air shown by a solid line in FIG. 1 is formed. That is, the air sucked into the blower fan 41 through the intake port 44 of the fan cover 43 and the suction port 41a of the blower fan 41 is discharged from the discharge port 41b of the fan 41 in the centrifugal direction. The discharged high-speed wind, after passing through the rectifying air passage, hits the inner surface of the cover peripheral wall 43a of the fan cover 41 and changes its direction toward the fan case mounting wall 4 while flowing therethrough. The electric motor is guided along the outer peripheral surface of the annular partition wall 47 while bypassing the peripheral portion, and passes through the first exhaust hole 49 formed in the projecting plate portion 4 a of the fan cover mounting wall 4 along the axial direction of the rotor 21. It is discharged to the exhaust air path 57 outside the frame 1.

In the blowing operation, the blowing air formed by the rotation of the blowing fan 41 has a higher pressure than the cooling air. However, the blowing of the blowing air into the electric motor section of the electric blower FM is controlled by the air path partitioning body 45. Can be prevented. Therefore, even if the air sucked into the blower fan 41 contains water, it is possible to prevent the iron-based parts of the motor unit from being rusted by the water. In addition, the air path partitioning body 45 partitions the air path so that the cooling air and the air blowing do not mix in the fan cover 43, and allows the respective winds to correspond to the respective exhaust holes 49,
Since the air is guided in the axial direction of the rotor 21 toward 50, a smooth flow of the cooling air can be ensured, so that the air cooling action of the electric motor unit can be prevented from being impaired. Can be maintained.

According to the above-described blowing operation,
The air is not exhausted directly through the cover peripheral wall 43a of the fan cover 43, and the direction is changed, so that the distance of the ventilation path from the discharge port 43a to the first exhaust hole 49 is long. The outlet 4 of the blower fan 41
The momentum of the high-speed wind, which has a good momentum immediately after being discharged from 1b, can be killed and discharged from the first exhaust hole 49 in the axial direction of the rotor 21.

Therefore, the wind noise generated when the wind passes through the first exhaust hole 49 can be reduced. Therefore, it is not necessary to bend the edge of the first exhaust hole 49 to reduce wind noise. If a quieter operation is required, it is effective to bend the edge of the first exhaust hole 49 to reduce wind noise. Moreover, since the overhanging plate portion 4a provided with the first exhaust holes 49 is not a curved surface but a flat surface, the first exhaust holes 49 to be formed thereon can be easily formed.

Since the air generated by the blower fan 41 is discharged from the fan cover mounting wall 4 in the axial direction of the rotor 21 as described above, the support rubber 53 fitted to the outside of the fan cover 43 has the first exhaust hole 49. Never block. Therefore, the fitting depth H (see FIG. 9) of the support rubber 53 to the fan cover 43 is ensured deeply, and the mounting state of the rubber 53 can be stabilized.

Therefore, when the electric blower FM is incorporated into the main body case of the vacuum cleaner, the support rubber 53 does not drop carelessly and the assembling work can be facilitated. Nevertheless, it is not necessary to provide multiple blowers and lengthen the fan cover in order to increase the fitting depth of the support rubber 53, so that only one blower fan 41 is required. Direction length can be shortened.

According to the flow of the wind formed by the blower fan 41, no space is required around the fan cover 43 for flowing the wind. Therefore, the substantial installation space of the electric blower FM can be reduced, and other parts around the blower FM can be arranged close to each other, or the main body case of the vacuum cleaner can be downsized along the radial direction of the electric blower FM. It is advantageous when aiming.

The present invention is not limited to the above embodiment. For example, a first motor frame forming a fan cover mounting wall is connected to one end of a stator core, and a second motor frame to which a brush device is mounted is connected to the other end of the stator core. The present invention can also be applied to an electric blower having a configuration in which is exposed. When a closing plate is provided in this type of implementation, the closing plate may be attached to the stator so as to close the gap between the second motor frame and the stator.

Further, in the present invention, the blower exhaust unit 49
It may be formed over the overhanging plate portion 4a and the overhanging peripheral portion 4b, or may be formed over the overhanging peripheral portion 4b and the overhanging edge portion 4.
c (the open end is closed by the cover peripheral wall 43a of the fan cover 43), or the overhanging edge 4
It may be formed by a notch provided in c. Further, the blower / exhaust portion 49 may be formed by a long hole extending in the circumferential direction of the overhang plate portion 4a.

Further, in the above-described embodiment, the blower / exhaust unit 49 is provided.
The cooling exhaust part 50 and the cooling exhaust part 50 are respectively formed by separate exhaust holes. Instead, a hole that is divided into two by an annular partition 47 is provided in the overhanging plate part 4a.
The hole located outside the gasket 7 may be used as the ventilation exhaust unit 49, and the hole located inside the annular partition wall 47 may be used as the cooling exhaust unit 50.

In the present invention, the closing plate 18 may be omitted. That is, the blower fan side portion 17a of the stator winding 17 is bent radially outward so as to move away from the rotor shaft 21, and a portion of the portion is opposed to the gap G when the closing plate 18 is not provided. Along with the cooling air passing through the cooling passage 25 and reaching the cooling exhaust portion 50, the air gap G
This is because the cooling fan-side portion 17a can be air-cooled even with cooling air that reaches the cooling exhaust portion 50 through the cooling fan.

[0047]

As described in detail above, according to the electric blower of the present invention, the high-speed wind discharged from the blower fan is killed and passed through the blower exhaust portion of the fan cover mounting wall.
The wind noise associated with the blowing operation can be reduced, and the blower exhaust section is not blocked by the support rubber fitted to the outside of the fan cover, and there is no need to provide a multistage blower fan. The axial dimension can be shortened. Furthermore, while providing an air path partition having an annular partition, a cooling exhaust portion is provided on a fan cover mounting wall,
Since the cooling air can be discharged in the axial direction of the rotor without being mixed with the blowing, the blowing and the discharging of the cooling air can be performed smoothly, and the temperature rise of the motor unit can be reduced. Exposure can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of an electric blower according to one embodiment of the present invention along a line ZZ in FIG.

FIG. 2 is a view showing the configuration of the electric blower according to the embodiment as viewed from the direction of arrow Y in FIG. 1;

FIG. 3 is a diagram showing a configuration of a motor unit of the electric blower according to the embodiment when viewed from an arrow X direction in FIG. 1;

FIG. 4 is a diagram showing a configuration of an electric motor frame of the electric blower according to the embodiment when viewed from an arrow X direction in FIG. 1;

FIG. 5 is a plan view showing the configuration of the closing plate according to the embodiment.

FIG. 6 is a side view of the closing plate shown in FIG. 5;

FIG. 7 is a sectional view of the closing plate shown along the line WW in FIG. 5;

FIG. 8 is a plan view showing a state in which the pair of closing plates shown in FIG. 5 are attached to a stator.

FIG. 9 is a diagram showing an attached state of the electric blower according to the embodiment.

[Explanation of symbols]

4: Fan cover mounting wall, 6: Cooling through hole, 15: Stator, 18: Closing plate, 21: Rotor, 22: Rotor shaft, 25: Cooling passage, 37: Cooling fan, 41: Blowing fan, 43: Fan Cover, 45 ... Airway partition, 46 ...
Base portion, 47: annular partition wall, 49: first exhaust hole (blowing exhaust portion), 50: second exhaust hole (cooling exhaust portion).

Claims (1)

(57) [Claims] A centrifugal fan is mounted on one end of a rotor shaft of a rotor disposed inside a stator, and a cooling fan for cooling the stator and the rotor on the other end of the rotor shaft. A fan cover mounting wall is provided on the blower fan side to surround the stator and project outward, and the fan cover is mounted on the mount wall to cover the blower fan. An air path partition having an annular partition wall abutting on a surface on the side of the blower fan on a wall,
A cooling exhaust unit that is disposed between the fan cover mounting wall and the blower fan and that discharges the air blown by the cooling fan in the axial direction of the rotor shaft is positioned inside the annular partition wall. An electric blower, wherein a blower exhaust unit that discharges wind discharged from the blower fan in the axial direction of the rotor shaft is provided outside the annular partition wall.