JPH06108994A - Motor-driven blower - Google Patents

Abstract

PURPOSE:To provide a motor-driven blower designed to be low in air swishing sound generated in association with air blasting action and short in the axial dimension with less temperature rise. CONSTITUTION:A motor-driven blower for a wet and dry type vacuum cleaner is provided with a fan cover fitting wall 4 projecting while surrounding the outside of a stator 15, and a fan cover 43 is supported at this wall 4. An air duct partition body 45 is disposed between the wall 4 and a centrifugal fan 41 fitted to one end of the rotor shaft 22 of a rotor 21 and covered with the cover 43, and this partition body 45 has an annular partition wall 47 brought into contact with the fan side face of the wall 4. The wall 4 is provided with a cooling exhaust part positioned inside of the partition wall 47 so as to discharge the air blasted by a cooling fan 37 fitted to the other end of the shaft 22, and a blast exhaust part 49 positioned outside of the partition wall 47 so as to discharge the air discharged from the fan 41.

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 by being built in a cleaner body of a wet and dry type electric vacuum cleaner.

[0002]

2. Description of the Related Art An electric blower for a wet-and-dry type vacuum cleaner is provided with a centrifugal blower fan for sucking and blowing air containing water at one end of a rotor shaft and the other end of the rotor shaft. A cooling fan that sends 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. 59-1644 and Japanese Patent Publication No. 57-122835.

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

[0004]

By the way, 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. The conventional configuration has a problem in that a large amount of wind noise is generated because high-velocity, high-speed air immediately after being discharged from the blower fan passes directly through the exhaust hole.

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

Therefore, the mounting state of the support rubber becomes unstable, and the support rubber is liable to drop when the electric blower is assembled in the cleaner body of the electric vacuum cleaner, which is inconvenient for assembly. Therefore, conventionally, the blower fans are provided in multiple stages to increase the axial dimension of the fan cover, thereby ensuring a large fitting depth of the support rubber with respect to the corner portion and blocking the exhaust hole with this rubber. Are forced to avoid. Therefore, the conventional electric blower of this kind also has a problem that the axial dimension is long.

An object of the present invention is to obtain an electric blower which can reduce the wind noise caused by the blowing operation, the axial dimension thereof, and the temperature rise.

[0008]

According to the present invention, a centrifugal blower fan is attached to one end of a rotor shaft of a rotor arranged inside a stator, and the stator and the stator are attached to the other end of the rotor shaft. A cooling fan for cooling the rotor was attached, a fan cover mounting wall surrounding the stator and projecting outward was provided on the blower fan side, and a fan cover for covering the blower fan was attached to the mounting wall. It is applied to electric blowers. And
In order to achieve the above object, an air passage partitioning body having an annular partition wall that abuts the surface on the side of the blower fan on the fan cover mounting wall is arranged between the fan cover mounting wall and the blower fan, On the fan cover mounting wall, a cooling exhaust unit for exhausting the 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 air blower fan is supplied to the rotor. A blower / exhaust unit for discharging 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 section is provided not on the peripheral wall of the fan cover but on the fan cover mounting wall that surrounds the stator and projects outward. Therefore, the blower / exhaust section and the outlet of the blower fan are connected to each other. A long distance can be secured. Then, the fan cover receives the air discharged in the centrifugal direction from the discharge port on the inner surface of the cover peripheral wall, and changes the direction of the wind toward the blower / exhaust part, and the blower / exhaust part is changed in direction by the fan cover. The air is exhausted in the axial direction of the rotor. Therefore, high-speed, high-speed wind does not directly pass through the blower / exhaust unit, and the wind force can be killed and passed through the blower / 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 cools the stator portion formed by the rotation of the cooling fan and allows the cooling air flowing around the blower fan side portion of the stator winding to pass through the axial direction of the rotor. To discharge.
Moreover, the air passage division body prevents the air blown by the rotation of the blower fan and the cooling air caused by the rotation of the cooling fan from being mixed in the fan cover and disturbing each other's flow,
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 electric motor frame indicated 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 the cylindrical wall 2 as the first electric motor frame. Is integrally provided, the other end (the lower end in FIG. 1) of the cylindrical wall 2 is opened, and the fan cover mounting wall 4 is provided so as to integrally project outward from the edge of this opening. As shown in FIGS. 1 and 4, a bearing mounting portion 5 is integrally formed at the center portion of the end wall 3, and the mounting portion 5
A plurality of cooling through holes 6 are formed in the end wall 3 which is located at the periphery of.

As shown in FIG. 1, the opening of the cylindrical wall 2 is formed so that its diameter gradually increases toward the fan cover mounting wall 4 side 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 around the peripheral edge of the overhanging plate portion 4a and bending an overhanging edge portion 4c at the tip of this peripheral portion 4b. The projecting plate portion 4 a is projected outward so as to be orthogonal to the cylindrical wall 2. The overhanging peripheral portion 4b extends substantially parallel to the cylindrical wall 2 in the direction of the end wall 3, and the overhanging edge portion 4c is provided in parallel with the overhanging plate portion 4a.

As shown in FIG. 3, a sheet metal frame end face plate 7 as a second electric motor frame is horizontally mounted on the projecting plate portion 4a. The end face plate 7 has a shape that traverses the opening of the cylindrical wall 2 in the radial direction, and forms an electric motor frame body 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 length direction into a plurality of long holes 8 provided in the projecting plate portion 4a as shown in FIG. Is 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 center of the frame end plate 7 in the longitudinal direction. It should be noted that 7b in FIG. 3 may be omitted in the present invention, but it is a hole provided for weight reduction in the present embodiment. Further, the frame end face plate 7 is inclined so as to gradually separate from the opening of the cylindrical wall 2 as it goes from both ends to the bearing mounting portion 11, but this inclination is not necessary in the present invention.

A stator 15 is built in the motor frame 1. Therefore, the stator 15 is surrounded by the fan cover mounting wall 4. The stator 15 includes a pair of salient poles 16a (see FIG. 8) of a stator core 16 made of silicon steel plates laminated as shown in FIGS. 1 and 3 with an insulating slot (not shown) interposed between the stator windings. 17 are attached respectively.

The stator core 16 has a substantially quadrangular outer diameter shape when viewed from the end face direction, and its four corner outer surfaces are curved surfaces along the inner peripheral surface of the cylindrical wall 2. The stator 15 has its four corner outer surfaces brought into contact with the inner peripheral surface of the cylindrical wall 2, and is press-fitted into the cylindrical wall 2 from its opening side to be housed 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 closure plates 1
8 are combined with each other to form a circular outer circumference, and the outer circumference is in contact with the inner peripheral surface of the cylindrical wall 2. As a result, 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 closure plate 18 is shown in FIGS. That is, in the closing plate main portion 61 having the substantially arcuate peripheral end surface 61a along the inner peripheral surface of the cylindrical wall 2, the cooling fan side portion 17a of the stator winding 17 and the rotor 21 to be described later.
Is formed with a recess 62 for passing through. The first and second parts are provided on both side portions of the closing plate main portion 61 that sandwich the recess 62.
The engaging protrusions 63 and 64 are separately provided integrally with each other, and a slanted tongue 65 is integrally provided on the side of the engaging protrusion 63. The first engaging protrusion 63 is formed so as to be slightly raised 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 in steps. Rectangular engaging holes 66 are formed in the engaging protrusions 63 and 64, respectively. Further, slanting first and second hooking pieces 67 and 68 are respectively cut and raised in opposite directions on the both side portions of the closing plate main portion 61.

In the closing plate 18 having this structure, the first and second engaging protrusions 63, 6 are arranged so that the closing plate main portion 61 overlaps the outer surface of the stator 15 and the end surface of the stator core 16 on the side of the blower fan.
4 by inserting the stator core 16
And the cooling fan side portion 17a of the stator winding 17 are sandwiched and attached. Moreover, in this insertion, the pair of closing plates 18 are attached so that the center of the rotor 21 is arranged in point symmetry.

As a result, as shown in FIG. 8, the engagement hole 66 of the first engagement projection 63 of the one closing plate 18 and the second engagement piece 68 of the other closing plate 18 are engaged with each other. With
Hooking hole 66 of the second engaging projection 64 of the one closing plate 18
And the first hooking piece 67 of the other closing plate 18 are engaged with each other, and the slanted tongue pieces 65 of both closing plates 18 overlap one surface of the corresponding closing plate main portion 61, so that both closing plates 18 are Connected to each other.

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

A commutator 26 is attached to the rotor shaft 22. Brush devices 27 are attached to the cylindrical wall 2 at two locations corresponding to the radial direction, respectively, penetrating the cylindrical wall 2.
A brush (not shown) included in these devices 27 is a commutator 26.
The commutator pieces are pressed against the outer peripheral surfaces arranged in the circumferential direction. In addition, a motor frame body composed of the motor frame 1 and the frame end face plate 7, a stator 1
5, the closing plate 18, the rotor 21, the commutator 26, and the brush device 27 constitute an electric motor section of the electric blower of this embodiment.

An electric motor holder 31 made of synthetic resin is attached to the end wall 3 side of the electric motor frame 1. The holder 31 has a relief portion for the brush device 27 and the like and is fitted to the outer periphery of the cylindrical wall 2, a cylindrical wall cover portion 32, a cylindrical holder portion 33 having a smaller diameter than the cover portion 32, and these. Steps 3 that connect the parts together and contact the outer surface of the peripheral part of the end wall 3
4 and 4.

The holder portion 33 has mounting protrusions at two locations (not shown) inside thereof, and these are provided on the screw receiving projections 3a (see FIG. 4) projectingly formed at two locations on the end wall 3. I have come into contact with them. Then, these screw receiving projections 3a
Corresponding to the concave portion 33a provided on the outer surface of the holder portion 33
The electric motor holder 31 is fixed to the electric motor frame 1 by screwing these screws 35 into the screw holes 36 (see FIG. 4) of the screw receiving projection 3a from the mounting screws 35 (see FIG. 2).

One end portion (upper end portion in FIG. 1) of the rotor shaft 22 that penetrates the bearing mounting portion 5 and the bearing 23 is located at the inner center of the cylindrical holder portion 33, and the axial flow is at this one end portion. Shaped cooling fan 37 is fixed. In addition,
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 portion 33, and the blowing air of the cooling fan 37 is guided by the inner surface of the electric motor holder 31 and guided to the cooling through hole 6.

One sheet metal blower fan 41 is attached via a nut 42 to the other end portion (lower end portion in FIG. 1) of the rotor shaft 22 which penetrates the bearing mounting portion 11 and the bearing 24. The blower fan 41 has a suction port 4 at the center.
1a and a discharge port 41b at the peripheral portion thereof, and discharges the air sucked from the suction port 41a.
It is a centrifugal type which discharges from b in the centrifugal direction.

As shown in FIG. 1, the blower fan 41 is covered with a sheet metal fan cover 43. The fan cover 43 is formed by integrally connecting a cover end wall 43b to a lower end of a cover peripheral wall 43a having a cylindrical shape in FIG. 1, and providing an intake port 44 in a central portion of the wall 43b so as to closely face the intake port 41a. ing. This fan cover 43
Is attached to the fan cover mounting wall 4 by fitting the upper end opening (in FIG. 1) of the cover peripheral wall 43a to the projecting 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, a synthetic resin air passage partition body 45 for covering the opening of the electric 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 projecting from a peripheral portion of the base wall 46. Has been formed.

In FIG. 1, 46a and 46b are base walls 4.
6 is a pair of inner and outer straightening vanes that are integrally projected from the peripheral portion of 6 toward the cover wall 43b and contact the inner surface of the cover wall 43b.
These rectifying blades 46a and 46b are arcuate when viewed from the cover wall 43b side to form a rectifying air passage between them, and a large number of pairs are provided surrounding 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 toward the outlet on the cover peripheral wall 43a side, and rectifies the air discharged from the blower fan 41. It is designed to guide you. In the present invention, the rectifying blades 46a and 46b forming the rectifying air passage may be omitted.

The central portion of the base wall 46 is the frame end plate 7
Is fitted to the outside of the bearing mounting portion 11. The base wall 46 is attached to the frame end face plate 7 by the bearing mounting portion 11 thereof.
Is fixed to the frame end face plate 7 with a screw 48 (see a two-dot chain line in FIG. 3) screwed into a screw hole 7c (see FIG. 3) provided in the vicinity of the frame end face plate 7. Annular partition 47
Is projected in the axial direction of the rotor 21, and its outer peripheral surface faces the inner surface of the cover peripheral wall 43 a of the fan cover 43. Further, the tip end surface of the annular partition wall 47 is provided with the blower fan 4 on the projecting plate portion 4a of the fan cover mounting wall 4.
It is in contact with the surface on the first side. It should be noted that the partition wall 47 is provided at its tip end with a recess (not shown) that fits into the longitudinal end portions 7d of the frame end face plate 7.

Overhanging 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 blower exhaust units and a plurality of second exhaust holes 50 as cooling air exhaust units. There is. Each of the first exhaust holes 49 is formed in a portion located outside the annular partition wall 47 with respect to the projecting plate portion 4a,
Each second exhaust hole 50 is formed in a portion located inside the annular partition wall 47 with respect to the projecting plate portion 4a.

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

The electric blower FM having the above-mentioned structure is provided in the main body case of a wet and dry type electric vacuum cleaner as shown in FIG.
As shown in FIG.
It is built in so that 1 is located at the bottom. The cooling fan 37 side of the electric blower FM is supported by the rib 52 of the main body case via the 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 to the outside of the corner formed by the cover peripheral wall 43a of the fan cover 43 and the fan cover end wall 43b.

Further, reference numeral 55 in FIG. 9 is a partition wall of the main body case, which is provided with a rubber packing 56 and the motor frame 1
The exhaust passage 57 is formed between the rib 54a and the outer surface of the cylindrical wall 2. The exhaust air passage 57 prevents wind containing water from flowing to the brush device 27 side.

When the electric blower FM having the above structure is operated, the cooling fan 37 and the blower fan 41 are rotated together with the rotor 21. Therefore, due to the rotation of the cooling fan 37, the wind sent in the axial direction of the cooling fan 37 will not be discharged.
Through the cooling through hole 6 and flows into the electric motor frame 1 so as to be blown to the cooling fan side portion 17b of the stator winding 17. This wind has a configuration in which a closing plate 18 that closes a gap G between the stator 15 and the electric motor frame 1 is attached to the cooling passage 2 between the stator 15 and the rotor 21.
5, the stator 15 and the rotor 21 are cooled. And the wind passing through the cooling passage 25 is
It is guided to the inner surface of the air duct partition body 45 and is discharged to the exhaust air duct 57 outside the electric motor frame 1 through the second exhaust hole 50 formed in the projecting plate portion 4a of the fan cover mounting wall 5. Moreover, in guiding the cooling air in the air passage partitioning body 45, the cooling passage 25 is located between the pair of stator windings 17, and the second exhaust holes 50 are provided in the stator windings 17.
Since the blower fan side portion 17a is provided at an outer position so as to be sandwiched between the blower fan side portion 17a and the cooling passage 25, the cooling air having passed through the cooling passage 25 is arranged along the blower fan side portion 17a. The second exhaust hole 50 is reached while being guided by. The flow of the cooling air caused as described above is shown by a dotted arrow in FIG.

Therefore, this cooling air can reduce the temperature rise of the electric motor section. That is, as described above, not only the cooling air is blown to the blower fan side portion 17b of the stator winding 17 and then the cooling air is concentratedly passed through the cooling air passage 25, but also the blower fan side portion 17a of the stator winding 17 is provided. Since the cooling air can be made to flow along the
5 and the rotor 21 can be effectively air-cooled to reduce the temperature rise of the electric motor section.

On the other hand, the rotation of the blower fan 41 forms the flow of blown air shown by the solid line in FIG. 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 hits the inner surface of the cover peripheral wall 43a of the fan cover 41 after passing through the rectifying air passage, changes its direction toward the fan case mounting wall 4 side, and flows to the base portion 46 of the air passage partitioning body 45. The electric motor is guided along the outer peripheral surface of the annular partition wall 47 by bypassing the peripheral portion, and passes through the first exhaust hole 49 formed in the projecting plate portion 4a of the fan cover mounting wall 4 and along the axial direction of the rotor 21. It is discharged to the exhaust air passage 57 outside the frame 1.

In this air blowing operation, the air blown by the rotation of the air blower fan 41 has a higher pressure than the cooling air, but this air blow is sent to the electric motor part of the electric blower FM by the air passage partitioning body 45. It can be prevented. Therefore, even if the air drawn into the blower fan 41 contains water, it is possible to prevent the iron-based parts of the electric motor section from rusting due to the water. Moreover, the air passage partitioning body 45 partitions the air passage so that the cooling air and the blown air do not mix in the fan cover 43, and the respective air exhaust holes 49,
Since the rotor 21 is guided in the axial direction toward the rotor 50, it is possible to prevent a smooth flow of the cooling air from being impaired and impair the air-cooling action of the electric motor portion, and also to prevent the air flow from being disturbed, thereby providing a good air blowing action. Can be maintained.

According to the air blowing operation as described above,
Along with the fact that the exhaust gas is not directly passed through the cover peripheral wall 43a of the fan cover 43 and the direction is changed, the distance of the air blowing path from the discharge port 43a to the first exhaust hole 49 is long. The outlet 4 of the blower fan 41.
Immediately after being discharged from 1b, the strong high-speed wind can be killed to be 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 holes 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 projecting plate portion 4a provided with the first exhaust holes 49 is not a curved surface but a flat surface, it is possible to easily perform the boring process of the first exhaust holes 49 provided therein.

As described above, since the wind formed by the blower fan 41 is discharged from the fan cover mounting wall 4 in the axial direction of the rotor 21, the support rubber 53 fitted to the outer side of the fan cover 43 has the first exhaust hole 49. Does not block Therefore, the fitting depth H (see FIG. 9) of the support rubber 53 with respect to the fan cover 43 can be secured deep, and the mounting state of the rubber 53 can be stabilized.

Therefore, when the electric blower FM is assembled in the main body case of the electric vacuum cleaner, the support rubber 53 does not drop accidentally and the assembling work can be facilitated. Nonetheless, it is not necessary to provide blower fans in multiple stages to lengthen the fan cover in order to increase the fitting depth of the support rubber 53, and since only one blower fan 41 is required, the shaft of the electric blower FM is not required. The direction length can be shortened.

Further, according to the flow of air formed by the blower fan 41, there is no need to provide a space around the fan cover 43 for the air to flow. Therefore, the substantial installation space of the electric blower FM can be reduced, other parts around the blower FM can be arranged close to each other, or the main body case of the electric vacuum cleaner can be miniaturized along the radial direction of the electric blower FM. It is advantageous when trying to

The present invention is not limited to the above embodiment. For example, one end of the stator core is connected to a first electric motor frame forming a fan cover mounting wall, and the other end of the stator core is connected to a second electric motor frame to which a brush device is attached. The present invention can also be applied to an electric blower having a configuration in which the is exposed. When providing a closing plate for 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 is
It may be formed over the projecting plate portion 4a and the projecting peripheral portion 4b, or the projecting peripheral portion 4b and the projecting edge portion 4 may be formed.
a cutout (open end thereof is closed by the cover peripheral wall 43a of the fan cover 43), or the protruding edge portion 4
You may form by the notch provided in c. Further, the blower exhaust part 49 may be formed as an elongated hole extending in the circumferential direction of the projecting plate part 4a.

Further, in the above-described embodiment, the ventilation exhaust unit 49
Although the cooling exhaust part 50 and the cooling exhaust part 50 are respectively formed by separate exhaust holes, instead of this, a hole that is divided into two by the annular partition wall 47 is provided in the projecting plate part 4a, and the annular partition wall 4 of this hole is formed.
7 may be used as the blower exhaust part 49, and the hole part located inside the annular partition 47 may be used as the cooling exhaust part 50.

Moreover, the closing plate 18 may be omitted in the present invention. That is, since the blower fan side portion 17a of the stator winding 17 is bent outward in the radial direction so as to be away from the rotor shaft 21, and a part thereof has a relationship facing the gap G when the closing plate 18 is not provided, Along with the cooling air that passes through the cooling passage 25 and reaches the cooling exhaust portion 50, the gap G
This is because the blower fan side portion 17a can be air-cooled even with the cooling air that passes through to the cooling exhaust portion 50.

[0047]

As described in detail above, according to the electric blower of the present invention, the force of 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 that accompanies the blower operation can be reduced, and the blower exhaust part is not blocked by the support rubber that is fitted to the outside of the fan cover, and there is no need to install blower fans in multiple stages. The axial dimension can be shortened. Further, the air passage partitioning body having an annular partition wall is provided, and a cooling exhaust portion is provided on the fan cover mounting wall,
Since the cooling air can be discharged in the axial direction of the rotor without being mixed with the blowing air, the blowing air and the cooling air can be smoothly discharged, the temperature rise of the electric motor unit can be reduced, and the inside of the electric motor unit can be changed to the water contained in the air blow. You can prevent exposure.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a configuration of an electric blower according to the embodiment when viewed from a direction of an arrow Y in FIG.

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

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

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

FIG. 7 is a cross-sectional view of the closing plate taken along line WW in 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 view showing a mounting state of the electric blower according to the embodiment.

[Explanation of symbols]

4 ... Fan cover mounting wall, 6 ... Cooling through hole, 15 ... Stator, 18 ... Closure plate, 21 ... Rotor, 22 ... Rotor shaft, 25 ... Cooling passage, 37 ... Cooling fan, 41 ... Blower fan, 43 ... Fan Cover, 45 ... Airway partition, 46 ...
Base part, 47 ... Annular partition wall, 49 ... First exhaust hole (blast exhaust part), 50 ... Second exhaust hole (cooling exhaust part).

Claims (1)

[Claims] 1. A centrifugal fan is attached to one end of a rotor shaft of a rotor arranged inside a stator, and a cooling fan for cooling the stator and the rotor to the other end of the rotor shaft. In the electric blower, a fan cover mounting wall is provided on the side of the blower fan that surrounds the stator and projects outward, and a fan cover that covers the blower fan is mounted on the mounting wall. An air passage partitioning body having an annular partition wall that abuts the wall on the side of the blower fan,
A cooling exhaust unit is disposed between the fan cover mounting wall and the blower fan, and a cooling exhaust unit for exhausting the air blown by the cooling fan in the axial direction of the rotor shaft is located inside the annular partition wall. In addition to the above, an electric blower is provided which is provided outside the annular partition wall and has a blower exhaust part for discharging the air discharged from the blower fan in the axial direction of the rotor shaft.