JP2802208B2 - 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 for a vacuum cleaner of a wet and dry type, for example.

[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. Such an electric blower is known from Japanese Utility Model Publication No. 59-1644 and Japanese Patent Application Laid-Open No. 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, a very high-speed wind having a good momentum immediately after being discharged from the blower fan directly passes through the exhaust hole, and thus has a problem that a loud wind noise is generated.

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.

[0007] A first object of the present invention is to provide an electric blower that can reduce the sound generated by the blowing operation of a blower fan and can reduce the axial dimension. Ma
In addition, a second object of the present invention is to reduce the cooling performance.
To obtain an electric blower that can achieve the first object.
You.

[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.

In order to achieve the first object, the invention according to claim 1 is to provide an internal air passage partition having an annular partition wall abutting on a surface of the fan cover mounting wall on the side of the blower fan. A blower exhaust unit that is disposed between a fan cover mounting wall and the blower fan and that discharges air discharged from the blower fan in the axial direction of the rotor shaft to the fan cover mounting wall is located outside the annular partition wall. to be provided, the periphery of the inner air passage partition body than the blower discharge portion located radially outward of the fan cover mounting wall, the file
Air passage section that bends and protrudes toward the wall where the cover is attached
An outer peripheral wall of the painting body is provided, and the outer peripheral wall is provided inside the fan cover.
It is characterized in that it is opposed to the peripheral surface . Also,
In order to achieve the second object, the invention according to claim 2 is dependent on the invention according to claim 1, and is formed by a blower exhaust unit that discharges wind formed by rotation of the blower fan and a rotation of the cooling fan. And a cooling exhaust unit for exhausting the air from the cooling unit so that the air exhausted from these units is exhausted along the axial direction of the rotor.

[0010]

According to the first aspect of the present invention, the ventilation and exhaust section is provided with a fan.
Surround the stator, not the peripheral wall of the cover
Because it was installed on the wall that overhangs the fan cover,
Longer distance between the exhaust part and the outlet of the blower fan
it can. And, the fan cover,
In response to the wind discharged in the centrifugal direction from the discharge port,
The direction of the wind is changed to the side of the ventilation and exhaust unit. And inside
In the air path partition, the air sent by the air blowing fan reaches the stator side.
And thatFan cover mounting wall side
Outer wall of internal wind path partition body that is bent and projected
Is the diameter of the fan cover mounting wall
A blower and an exhauster for blowing air together with the cover peripheral wall on the outer side.
To the air outlet and the outlet of the blower fan.
Ensure a longer airway length between them. Ventilation and exhaust
Between the outer peripheral wall and the annular bulkhead.
Is discharged in the axial direction of the rotor through the wind guided to the rotor.

[0011] Therefore, a very high-speed wind having a good momentum does not pass directly through the blower / exhaust portion, and the wind force can be killed and passed through the blower / exhaust portion.

Further, since the ventilation and exhaust portion is provided on the fan cover mounting wall, the ventilation and exhaust portion is not blocked by the support rubber fitted to the outside of the fan cover. Also, billing
In the second aspect of the present invention, the air is exhausted from the ventilation exhaust unit.
The wind and the cooling air discharged from the cooling exhaust
So that they all follow the axial direction of the rotor without intersecting
Is good, the momentum discharged from the ventilation exhaust section is good.
Exhausted wind hinders exhaust of air from the cooling exhaust
And the cooling air can be discharged smoothly.
Wear.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will now be described with reference to FIGS.
An embodiment will be described. 1, 4, and 13 in FIG.
Is made of metal, and an end wall 3 is integrally provided at one end (upper end in FIG. 1) of the cylindrical wall 2 as the first electric motor frame so as to close the end, and the other end of the cylindrical wall 2 ( A lower end (in FIG. 1) is opened, and a fan cover mounting wall 4 is provided so as to integrally project outward from an edge of the opening.
As shown in FIGS. 1 and 4, a bearing mounting portion 5 is integrally formed at a central portion of the end wall 3, and a plurality of cooling A through hole 6 is provided.

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 (see FIGS. 3 and 4) provided in the overhang plate portion 4a. Screws 10 (see FIG. 3) passing through both ends in the longitudinal direction of the frame end face plate 7 are screwed into a plurality of screw holes 9 provided in the vicinity of the fan cover 8 so that the screw holes 9 are mounted on the fan cover mounting wall 4. I have.

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 may be omitted. Further, reference numeral 12 in FIG. 4 denotes a screw hole provided in the overhanging plate portion 4a, and reference numeral 13 in FIG. 4 also denotes a screw hole.

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 pair of salient poles 1 included in a stator core 16 made of silicon steel plates laminated as shown in FIGS. 1, 3 and 8.
6a (see FIG. 8) are formed by attaching stator windings 17 via insulating slots (not shown).

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 as 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 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 engagement protrusions 63 and 64 are separately and integrally protruded, respectively, and the oblique tongue 65 is integrally protruded from the first engagement protrusion 63 side.

The first engaging projection 63 is formed so as to be slightly raised on one surface side of the closing plate main portion 61 to form a step.
The second engaging projection 64 is formed so as to be slightly raised on the other surface side of the closing plate main portion 61 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 and 6 of the closing plate 18 of this configuration 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 attached so that the center of the rotor 21 is arranged point-symmetrically.

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.

As shown in FIG. 1, 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 built in the bearing mounting portions 5 and 11, respectively.
4 penetrates. As shown in FIG. 1, a cooling passage 25 is formed between the outer peripheral surface of the rotor 21 and the inner peripheral surface of the stator core 16 facing each other. 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 unit of the electric blower.

As shown in FIG. 1, a motor holder 31 made of synthetic resin is mounted on the end wall 3 of the motor frame 1. The holder 31 includes a cylindrical wall cover portion 32 fitted with an outer periphery of the cylindrical wall 2 having an escape groove formed of a notch corresponding to the brush device 27 and the like, and a cover 3.
A cylindrical holder portion 33 having a diameter smaller than 2 is formed, and a step portion 34 that connects these members integrally and comes into contact with the outer peripheral surface of the end wall 3 is formed.

The holder portion 33 has mounting projections at two places (not shown) inside thereof, and these are formed on screw receiving projections 3a (see FIG. 4) formed at two places on the end wall 3. 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 inside 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 (the 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 internal air path partition 4 made of synthetic resin that covers the opening of the motor frame 1.
5 are arranged. This partition 45 is shown in FIGS.
As shown in FIG. 10, an annular partition wall 47 and an outer peripheral wall of an internal air passage partition (hereinafter, abbreviated as an outer peripheral wall) are provided around a disk-shaped base wall 46 facing the blower fan 41 .
48 are integrally provided.

The base wall 46 has a diameter larger than that of the blower fan 41, and its central portion is fitted outside the bearing mounting portion 11 of the frame end face plate 7. 9 and 10
The middle 46c is a fitting hole. The base wall 46 has a screw 80 (2 in FIG. 3) that is screwed into a screw hole 7c (see FIG. 3) provided in the frame end face plate 7 near the bearing mounting portion 11.
It is fixed to the frame end face plate 7 so as to cover the end plate 7 via a dotted line).

The annular partition wall 47 protrudes in the axial direction of the rotor 21, and its protruding distal end surface is in contact with the surface of the overhanging plate portion 4 a of the fan cover mounting wall 4 on the side of the blower fan 41 and is adhesively sealed. In addition, this annular partition 47
Are provided with recesses 47d (see FIG. 10) which are fitted to both end portions 7d in the longitudinal direction of the frame end face plate 7.

The outer peripheral wall 48 is provided so as to be bent from the peripheral edge of the internal air passage partition 45 toward the fan cover mounting wall 4 side. The peripheral edge of the internal wind path partitioning body 45 is located radially outside the fan cover mounting wall 4 with respect to a blower / discharge unit 49 to be described later. The outer peripheral surface of the outer peripheral wall 48 faces the inner peripheral surface of the cover peripheral wall 43 a of the fan cover 43, and the inner peripheral surface faces the outer peripheral surface of the annular partition wall 47. The protruding tip of the outer peripheral wall 48 is opposed to and close to the overhang plate 4 a of the fan cover mounting wall 4. And, for example, the ventilation interval A between the cover peripheral wall 43a and the outer peripheral wall 48 is
The protrusion length H of the outer peripheral wall 48 is set at 7.0 mm, and the interval I between the projecting tip of the outer peripheral wall 48 and the overhang plate portion 4a of the fan cover mounting wall 4 is set at 5.6 mm.

In FIG. 1 and FIG. 9, reference numeral 46a denotes rectifying vanes which are integrally provided on the periphery of the base wall 46 in the direction of the cover end wall 43b and come into contact with the inner surface of the cover end wall 43b. As shown in FIG. 9, a plurality of rectifying air passages 46b are formed between each other in an arc shape, and a large number are provided so as to surround the blower fan 41. The rectifying air passage 46b 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. The length of the road is long enough to guide the wind while rectifying the wind. In the present invention, the rectifying vanes 46a forming the rectifying air passage 46b may be omitted. In addition, reference numeral 46c in FIG. 10 denotes a rectifying rib.

The projecting plate portion 4a of the fan cover mounting wall 4 is provided with a plurality of first exhaust holes 49 as blower exhaust portions as shown in FIGS.
A plurality of second exhaust holes 50 are provided as cooling air exhaust units. 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.

In the electric blower FM having the above-described structure, an external air passage partitioning member 75 is mounted on the projecting plate portion 4a of the fan cover mounting wall 4. The partition 75 constitutes an electric blower together with the electric blower FM and an air passage partition described later, and is shown in FIGS. 1, 2, 11, and 12.
As shown in the figure, it is formed in a ring shape with a synthetic resin.

The outer air passage partition 75 has an inner peripheral wall 76, an outer peripheral wall 77 parallel to the wall 76, and both walls 76, 77.
Are formed in a ring shape from a bottom wall 78 to which are integrally connected. The inner peripheral wall 76 has the same diameter as the annular partition wall 47 of the internal air passage partition 45, and the outer peripheral wall 77 has a diameter larger than the outer diameter of the fan cover 43.

The outer air passage partitioning body 75 is attached to the overhang plate portion 4a via screws 79 which are screwed into four screw holes 13 (see FIG. 4) formed in the overhang plate portion 4a of the fan cover mounting wall 4. Fixed. In the annular concave portion formed by each of the walls 76 to 78, a portion of the overhang plate portion 4a located outside the annular partition wall 47 and the fan cover 43
Of the cooling fan 37 is housed.

More specifically, the inner peripheral wall 76 is in contact with the surface of the plate portion 4a on the cooling fan 37 side with the projecting plate portion 4a sandwiched between the annular partition wall 47 and the inner peripheral wall 76, and the inner peripheral wall 76 is adhesively sealed to form a seal.
7 is located on the extension line. The outer peripheral wall 77 is positioned so as to surround the opening of the cover peripheral wall 43a of the fan cover 43 on the cooling fan 37 side. The bottom wall 78 is located so as to face an outer peripheral side portion of the first exhaust hole 49 of the fan cover mounting wall 4.

The base wall 46 of the internal wind path partition 45
The air gap A between the outer peripheral surface of the fan cover 43 and the peripheral wall 43a of the fan cover 43, the air gap B between the annular peripheral wall 47 of the internal wind path partition 45 and the peripheral wall 43a, and the first air gap
The diameter C of the exhaust hole 49 and the inner peripheral wall 76 of the external wind path partition 75
Air gap D between the fan cover mounting wall 4 and the overhanging peripheral portion 4c, the air gap E between the opening edge of the fan cover 43 and the bottom wall 78 of the external air path partition 75, and the fan cover 4
3 and the ventilation gap F between the outer peripheral wall 77 of the external air passage partition 75 are defined by the relationship of E <A <F <C <D <B. Thereby, the first exhaust air passage 57 (FIG. 1)
3) has a passage configuration that repeats expanding and then expanding after being narrowed.

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 FIG. 3, the cooling fan 37 is built in such that it is located above and the blower fan 41 is located below. The cooling fan 37 side of the electric blower FM has an annular support rubber 51 fitted to the outside of the holder portion 33 of the electric motor holder 31.
And the fan 52 of the electric blower FM is fitted outside the corner formed by the cover peripheral wall 43a of the fan cover 43 and the fan cover end wall 43b. Annular support rubber 53
Through the ribs 54a and 54b of the main body case.

In FIG. 13, reference numeral 55 denotes an air passage partition of the main body case, which supports an external air passage partition 75 through an annular support rubber 56. This air path partition 55
A first exhaust passage 57 for blowing air is formed between the air passage rib 54a and the rib 54a. The exhaust air passage 57 prevents the air containing water from flowing to the brush device 27 side. 52, a second exhaust passage 5 for cooling air.
8 are formed.

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.

The wind that has passed through the cooling passage 25 is guided to the inner surface of the internal air passage partitioning body 45, passes through the second exhaust hole 50 formed in the projecting plate portion 4 a of the fan cover mounting wall 4 , and passes through the motor frame 1. It is discharged outside. Moreover, in guiding the cooling air in the internal air passage partitioning body 45, the cooling passage 25 is located between the pair of stator windings 17, and
The exhaust hole 50 is provided in the blower fan side portion 17 of the stator winding 17.
is provided at an outer position so as to be sandwiched between the cooling air passage 25 and the cooling passage 25, so that the cooling air passing through the cooling passage 25 can flow along the blowing fan side portion 17a.
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. 1, and the exhaust of the cooling air flows along the axial direction of the rotor 21.
Flow outside the cylindrical wall 2 toward the motor holder 31.
Ru is discharged to be.

Therefore, a rise in the temperature of the motor can be reduced by the cooling air. That is, after the cooling air is blown onto 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 passage 25 but also passed through the 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.

The cooling air discharged to the outside of the motor frame 1 through the second exhaust hole 50 flows between the outer peripheral surface of the cylindrical wall 2 of the electric motor frame 1 and the inner peripheral surface of the outer air passage partition 75. Then, the air is guided to the second exhaust air passage 58, and is appropriately exhausted from the air passage 58 to the outside of the main body case.

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.

After the discharged very high-speed wind passes through the rectifying air passage 46b, it hits the inner surface of the cover peripheral wall 43a of the fan cover 43 and changes its direction toward the fan cover mounting wall 4 while flowing therethrough. Outer peripheral wall 4 of partition 45
8 and are guided by the cover peripheral wall 43a of the fan cover 43 and pass between them. Thereafter, the direction of the outer peripheral wall 48 is changed.
Protruding end of the fan cover mounting wall 4
a, and flows into the space between the annular partition 47 and the outer peripheral wall 48 of the internal air passage partitioning body 45, and then the first exhaust gas formed on the overhanging plate portion 4 a of the fan cover mounting wall 4. Through the hole 49, it is discharged out of the motor frame 1 along the axial direction of the rotor 21.

In this blowing operation, the inner air passage partition 4
The annular partition wall 47 of FIG. 5 partitions the air path so that the cooling air and the blowing air do not mix in the fan cover 43, and directs the respective air toward the corresponding exhaust holes 49, 50 by rotating the shaft of the rotor 21. Guide in the direction. Therefore, the first exhaust hole
49 and the air discharged from the second exhaust hole 50 to the outside.
The wind that is emitted is low without crossing each other.
Is discharged along the axial direction of the
The second exhaust hole is generated by the strong wind exhausted from the hole 49.
The exhaust of the wind from 50 is not hindered. Therefore, a smooth flow of the cooling air can be ensured to prevent the air cooling action of the electric motor unit from being impaired, and the turbulence of the air blowing can be prevented, so that a good air blowing action can be maintained.

The air blown out of the motor frame 1 through the first exhaust hole 49 is supplied to the inner peripheral surface of the overhanging peripheral portion 4b of the fan cover mounting wall 4 and the outer peripheral surface of the outer air passage partition 75. The air is guided to the first exhaust air passage 57 through the space, and is appropriately exhausted from the air passage 57 to the outside of the main body case.

As described above, the cooling air and the air blown from the exhaust holes 49 and 50 are separately guided by the external air path partitioning body 75 and the air path partition 55, so that these airs are mixed. And the first and second exhaust air paths 5
Since the cooling air and the blowing air are separately guided and exhausted by 7, 58, even if the air sucked into the blowing fan 41 contains water, the electric blower FM may be exposed to the water from outside. Absent. Further, 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 internal wind path partitioning body 45 determines that the blowing air is blown into the electric motor unit of the electric blower FM. Can be prevented. Therefore, even if the air sucked into the blower fan 41 contains water, the inside of the motor unit is not exposed to the water. As described above, since the water contained in the air does not act on the inside and outside of the motor unit, it is possible to prevent adverse effects due to water, such as rust on iron-based parts of the motor unit.

According to the blowing operation, high-speed wind is not exhausted directly through the cover peripheral wall 43a of the fan cover 43, and the wind is changed in direction by the cover peripheral wall 43a. Thus, by providing the first exhaust hole 49 in the projecting plate portion 4a of the fan cover mounting wall 4, the distance of the physical air path from the discharge port 43a to the first exhaust hole 49 can be increased. In addition, the internal wind path partition 45
1 prevents the wind from flowing as indicated by a dotted arrow a in FIG. 1 and guides the wind as indicated by a solid arrow b, and changes the direction to flow, thereby providing an actual wind path. Length can be longer.

As described above, the discharge port 41 of the blower fan 41
b can be discharged from the first exhaust hole 49 in the axial direction of the rotor 21 by killing the momentum of the good high-speed wind immediately after being discharged from the b. Wind noise can be reduced. Therefore, it is not necessary to bend the edge of the first exhaust hole 49 to reduce wind noise.

When 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.

Further, in this embodiment, the configuration of the external air path partitioning body 75 allows the air discharged from the first exhaust hole 49 to be supplied to the bottom wall 78 and the outer peripheral wall 7 of the external air path partitioning wall 75.
Since the direction is changed by U and the U-turn is performed and the U-turn is conducted to the first exhaust air path 56, the blowing force is further reduced, and the wind noise accompanying the blowing operation can be further reduced. At this time, due to the configuration of the air blowing gaps A to F as described above, the air blown from the blower fan 41 to the first exhaust air passage 57 repeats the expansion and contraction many times. The sound can be made smaller.

The reduction of the driving noise as described above was clarified in the following noise measurement test. In this measurement test, the electric blower was installed as a single unit on a urethane resin measurement table having a thickness of about 60 mm and about 21 kg / m3, and the intake port 44 of the fan cover 43 was kept open.
The measurement was performed with the microphone placed just above the electric blower at a distance of 1 m from the surface, and the measurement results are shown in FIG. FIG. 15 shows the outer peripheral wall 4 having a protrusion length H of 10 mm.
FIG. 16 shows the measurement results of the electric blower using the internal air passage partition 45 having no outer peripheral wall 48, and FIG. 16 shows the measurement results of the electric blower using the internal air passage partition 45 having the outer wall 48.

The noise level of the electric blower of this embodiment shown in FIG. 14 is 85.4 dB, and
Noise level of the electric blower shown in Fig. 16 with no configuration
It was found that 1.4 dB noise could be reduced from 86.8 dB. As can be seen from the comparison between FIG. 14 and FIG. 16, in the present embodiment, the frequency characteristic of the L portion in FIG. 16 can be improved, and thereby the noise level can be reduced. In addition, even if the projection length H has the outer peripheral wall 48 of 10 mm, the noise level is 85.6 dB as shown in FIG.
It turned out that it can be made smaller.

Further, the wind generated by the blower fan 41 as described above is applied in the axial direction of the rotor 21 to the fan cover mounting wall 4.
Therefore, the support rubber 53 fitted to the outside of the fan cover 43 does not block the first exhaust hole 49. Therefore, the fitting depth K (see FIG. 13) of the support rubber 53 to the fan cover 43 is ensured deeply, and the mounting state of the rubber 53 can be stabilized.

Accordingly, when the electric blower FM is incorporated into the main body case of the electric vacuum cleaner, the support rubber 53 does not drop carelessly, and the assembling work can be facilitated. Nevertheless, there is no need to provide a multi-stage blower fan and increase the fan cover 43 in order to increase the fitting depth of the support rubber 53.
Since only one is required, the axial length of the electric blower FM can be reduced.

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 electric blower FM
The installation space of the fan can be reduced.
This is advantageous in arranging other parts around the device close to each other or reducing the size of the main body case of the vacuum cleaner along the radial direction of the electric blower FM.

FIG. 17 shows a second embodiment of the present invention. In the description of this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, description thereof will be omitted, and only the configuration different from the first embodiment will be described below. I do.

The difference between the second embodiment and the first embodiment is that the second embodiment is bent at the periphery of the internal air passage partitioning body 45.
Outer wall of the internal wind path partition (hereinafter, abbreviated as the outer wall).
The configuration of the second embodiment is the same as that of the first embodiment except for the parts not shown. In other words, the outer peripheral wall 48a whose protruding tip is closer to the overhanging plate portion 4a of the fan cover mounting wall 4 is moved toward the protruding tip toward the cover peripheral wall 43 of the fan cover 43.
The angle is gradually approached to a.

In the structure of the second embodiment, the desired object of the present invention can be achieved by the same operation as in the first embodiment, and the noise can be further reduced. That is, the rectified air passage 4 discharged from the blower fan 41
6b is directed obliquely outward between the cover peripheral wall 43a of the fan cover 43 and the outer peripheral wall 48a of the internal airflow path partitioning body 45 so that the flow of the wind is reduced. Since abrupt changes such as bending at a right angle can be reduced, turbulence can be reduced. Therefore, generation of sound based on turbulence is suppressed, and the overall noise level can be reduced. In addition, since the generation of turbulence is suppressed as described above, the energy loss of the wind is reduced, and the wind easily flows, so that the motor efficiency can be improved.

FIG. 18 shows a third embodiment of the present invention. In the description of this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, description thereof will be omitted, and only the configuration different from the first embodiment will be described below. I do.

The difference between the third embodiment and the first embodiment is that the third embodiment is bent at the periphery of the internal air passage partitioning body 45.
Outer wall of the internal wind path partition (hereinafter, abbreviated as the outer wall).
48a and the cover peripheral wall 43c of the fan cover 43
The other configuration is the same as that of the first embodiment including the parts not shown.

That is, the outer peripheral wall 48a whose protruding tip faces the protruding plate portion 4a of the fan cover mounting wall 4 and is brought closer to the cover peripheral wall 43c of the fan cover 43 toward the protruding tip. I have. A portion of the cover peripheral wall 43c facing the outer peripheral wall 48a is inclined in parallel with the outer peripheral wall 48a.

In the structure of the third embodiment, the desired object of the present invention can be achieved by the same operation as that of the first embodiment, and the noise can be further reduced. The reason is the same as in the second embodiment, and a description thereof will be omitted.

The present invention is not limited to the above embodiments. 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 by an elongated hole extending in the circumferential direction of the overhang plate portion 4a. Further, in each of the above embodiments, the ventilation exhaust unit 49 and the cooling exhaust unit 50 are formed by separate exhaust holes, respectively.
Instead, a hole that is divided into two by the annular partition 47 is provided in the overhanging plate portion 4a, and the hole portion of the hole located outside the annular partition 47 is used as the ventilation / exhaust portion 49 and the annular partition The hole located inside 47 may be used as 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.

Further, in each of the above embodiments, the external air path partitioning body 75 is mounted on the electric blower, but these are provided on a blower installation member such as a main body case of the vacuum cleaner, and by installing the electric blower on this member. Alternatively, the electric blower may be implemented so as to contact the cooling fan side surface of the fan mounting wall of the electric blower.

[0074]

As described in detail above, according to the electric blower according to the first aspect of the present invention, the fan cover mounting wall is provided along the axial direction of the rotor by killing the high-speed wind force discharged from the blower fan. While being bent toward the mounting wall side at the peripheral edge of the inner air passage section and projecting therefrom.
The internal wind path partition outer wall provided provides a long air path length from the blower fan to the blower exhaust section, so that the wind noise caused by the blower operation can be reduced and the blower exhaust section fits outside the fan cover. There is no need to provide a blower fan in multiple stages without being blocked by the support rubber to be combined, so that the axial dimension of the entire electric blower can be shortened. Further, according to the electric blower according to the second aspect of the present invention, which is dependent on the first aspect, in addition to the effect of the first aspect, the cooling exhaust section is provided by the vibrant wind discharged from the blower exhaust section. Since the discharge of the cooling air from the air blower is not hindered and the discharge of the cooling air can be smoothly performed, it is possible to prevent the air cooling action of the electric blower from being impaired.

[Brief description of the drawings]

FIG. 1 is a side view showing a partially sectioned configuration of an electric blower according to a first embodiment of the present invention.

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

FIG. 3 is a diagram showing a configuration of an electric motor unit of the electric blower according to the first embodiment, as 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 first embodiment, as 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 first 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 the internal airflow path section according to the first embodiment as viewed from the direction of arrow X in FIG. 1;

FIG. 10 is a diagram showing the internal airflow path section according to the first embodiment as viewed from the direction of arrow Y in FIG. 1;

FIG. 11 is a plan view showing the configuration of the external wind path partition according to the first embodiment.

FIG. 12 is a side view showing a partial cross section of the external air passage partition shown in FIG. 11;

FIG. 13 is a view showing an attached state of the electric blower according to the first embodiment.

FIG. 14 is a diagram showing a result of noise measurement of the electric blower according to the first embodiment.

FIG. 15 is a first view of the electric blower according to the first embodiment;
The figure which shows the result of the noise measurement about the electric blower which concerns on a comparative example.

FIG. 16 shows a second example of the electric blower according to the first embodiment.
The figure which shows the result of the noise measurement about the electric blower which concerns on a comparative example.

FIG. 17 is a side view showing a partially sectioned configuration of an electric blower according to a second embodiment of the present invention.

FIG. 18 is a side view partially showing a configuration of an electric blower according to a third embodiment of the present invention.

[Explanation of symbols]

4 ... Fan cover mounting wall, 4a ... Overhang plate part, 6 ...
Cooling through holes, 15: stator, 21: rotor, 22: rotor shaft, 25: cooling passage, 37: cooling fan, 41: blower fan, 43: fan cover, 43a, 43c: cover peripheral wall, 45: internal air passage Partition, 46 ... base, 47
... annular partition wall, 48, 48a ... inner air path partition body outer peripheral wall , 4
9: first exhaust hole (blowing exhaust portion), 50: second exhaust hole (cooling exhaust portion).

Claims (2)

(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 that surrounds the stator and projects outward from the blower fan side, and a fan cover that covers the blower fan is mounted on the mounting wall. An internal air passage partition having an annular partition wall abutting on a surface of the wall on the side of the blower fan and separating a wind formed by rotation of the blower fan and a wind formed by rotation of the cooling fan; The fan is disposed between the cover mounting wall and the blower fan, and the wind discharged from the blower fan is applied to the fan cover mounting wall in the axial direction of the rotor shaft. The blower exhaust portion for discharging located outside of the annular partition wall provided on the periphery of the inner air passage partition body than the blower discharge portion located radially outward of the fan cover mounting wall, the full
Internal air passage that bends and protrudes toward the wall where the fan cover is mounted
A partition body outer peripheral wall is provided, and this outer peripheral wall is
An electric blower characterized by being opposed to an inner peripheral surface . 2. An air supply and exhaust unit for discharging air generated by rotation of the blower fan and a cooling and exhaust unit for discharging air generated by rotation of the cooling fan. The electric blower according to claim 1, wherein the blower is provided so as to be discharged along the axial direction of the rotor.