JP2002153017A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

(57) [Problem] To provide a vacuum cleaner with high usability by providing a cooling fan for cooling the motor section inside the motor section, thereby reducing the noise and size of the vacuum cleaner. A bearing is provided on both sides of a shaft of a rotor.
36, a bracket 33, 34 constituting a housing of the motor unit 29, and an impeller 31 fixed to one end of a shaft 37 of the rotor 45. The motor unit is provided between the bearings 35, 36. 29 Cooling fan 90 for cooling
The size of the electric blower 50 can be reduced. The outer periphery of the cooling fan 90 is provided on the bracket 3
Since it is covered with 3, 34, the wind noise itself generated from the cooling fan 90 can also be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower mainly used for an electric vacuum cleaner, and more particularly to an electric blower which realizes a quieter and smaller size of the electric vacuum cleaner and improves usability. It is.

[0002]

2. Description of the Related Art In recent years, vacuum cleaners have been introduced into the market by a system called an exhaust circulation system that recirculates exhaust air from an electric blower to the tip of a suction tool, and a product completely different from a conventional vacuum cleaner attracts attention in the market. I'm coming. here,
An exhaust circulation type vacuum cleaner will be described as a conventional example, but the content of the present invention is not limited to only an exhaust circulation type vacuum cleaner.

A conventional vacuum cleaner will be described with reference to FIGS.

[0005] As shown in FIG. 5, a vacuum cleaner 1 has a hose 5 detachably connected to a cleaner body 2.
The other end is provided with a distal end pipe 16 forming an operation section 15. The extension pipe 6 is connected to the tip pipe 16, and the suction tool 7 is connected to the extension pipe 6.

[0005] A dust collecting chamber 4 is formed in the cleaner body 2 in communication with a hose 5, and a fan suction port 1 is provided behind the dust collecting chamber 4.
9, an electric blower 3 arranged to face the dust collection chamber 4 side;
A code reel 14 is provided. Further, the cleaner main body 2 and the hose 5 are connected through the fan outlet 20 of the electric blower 3.
The main body exhaust passage 10 is formed up to the connection portion with the main body.
The hose 5, the extension pipe 6, and the suction tool 7 communicate with the dust collection chamber 4 in the cleaner main body 2, and an intake passage 8 which is a flow path of an airflow guided to a fan intake port 19 of the electric blower 3. The air is exhausted from the fan outlet 20 of the electric blower 3,
0, an exhaust passage 9 for sending an exhaust flow ahead of the hose 5
Are respectively formed, the passages of each other are independent of each other,
And it is separated from the outside air space.

Next, the conventional electric blower 3 of the bypass type is used.
Will be described with reference to FIG.

As shown in FIG. 6, the electric blower 3 includes a motor unit 29 and a fan unit 28, and the motor unit 29
An armature core 38 provided with an armature winding 39;
2 is provided on the shaft 37 and the rotor 45 is configured.
Are rotatably provided on the load-side bracket 33 and the non-load-side bracket 34 via a load-side bearing 35 and a non-load-side bearing 36, respectively. Also, the load side bracket 3
3 and the non-load side bracket 34 are combined to form a housing of the motor unit 29, and a stator 46 in which the field winding 41 is applied to the field core 40 and a carbon brush (not shown) are provided inside. A holder (not shown) is fixed to the non-load side bracket 34.

A shaft 37 extends in the direction opposite to the load on the rear side of the motor unit 29, and a cooling fan 80 for cooling the motor unit 29 is provided on the extended shaft 37.
The outer periphery of the cooling fan 80 is fixed to the non-load side bracket 34 so as to be covered with a safety cover 81 made of resin, iron plate, or the like, and the cooling air generated by the cooling fan 80 is applied to the anti-load side bracket 34 to the outside. A motor unit exhaust port 73 is provided for discharge.

The fan section 28 is provided on an impeller 31 provided on a shaft 37 of the motor section 29, and is disposed on an outer peripheral portion of the impeller 31. An air guide 32 that forms an air passage for guiding the air, and a casing 30 that covers the air guide 32 are provided.
The casing 3
On one side surface, a plurality of fan outlets 20 for discharging the blown air generated by the impeller 31 to the outside are provided.

When the electric vacuum cleaner 1 is operated, the electric blower 3
As a result, a suction force is generated, and dirty air including dust and the like is sucked from the suction port 11 of the suction tool 7, and is passed through the suction tool 7, the extension pipe 6, and the suction passage 8 of the hose 5.
After the dust and the like are removed in the dust collection chamber 4, the exhaust gas guided to the electric blower 3 and discharged from the fan exhaust port 20 of the electric blower 3 passes through the main body exhaust passage 10 through the hose 5.
The gas is discharged from an outlet (not shown) near the suction port 11 of the suction tool 7 through the extension pipe 6 and the exhaust path 9 of the suction tool 7.
Here, the exhaust gas discharged from the vicinity of the suction port 11 of the suction tool 7 is sucked again from the suction port 11 and transports the dust to the dust collection chamber 4 in the same manner. . In addition, a wind path for cooling the motor unit 29 is formed by passing air sucked by the cooling fan 80 through a motor unit intake passage 72 connecting the motor unit intake port 70 and the main body intake port 71 to cool the motor unit 29. The exhaust gas having a relatively high temperature passes through a motor exhaust passage 75 that connects the motor exhaust port 73 and the main body exhaust port 74, and is discharged to the outside of the cleaner body 2.

At this time, the circulating wind passes through the fan section 28, and the relatively cool wind circulates.
The temperature rise in the exhaust path 9 of the hose 5, the extension pipe 6, and the suction tool 7 can be suppressed.

[0012]

However, in the vacuum cleaner 1 of the above-mentioned conventional construction, in the case of the exhaust circulation system, a cooling fan 80 for cooling the motor unit 29 is provided as a separate component behind the anti-load bracket 34. The length of the electric blower 3 itself is increased, and the safety cover 81 provided on the outer periphery of the cooling fan 80 in order to increase the cooling air flow of the cooling fan 80 has a configuration having a plurality of holes.
There is a problem that the noise generated by the cooling fan 80 is extremely large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. By providing a cooling fan for cooling a motor unit inside the motor unit, the vacuum cleaner can be made quieter and smaller. It is intended to provide a highly usable vacuum cleaner.

[0014]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a motor unit having a bearing for rotatably supporting both sides of a shaft of a rotor, a bracket constituting a housing of the motor unit, An impeller fixed to one end of the shaft of the rotor is provided, and a cooling fan for cooling the motor unit is provided between the bearings, so that the dead space between the motor unit and the bracket can be effectively used, and the cooling effect of the motor unit can be improved. Since the overall length of the electric blower can be shortened without lowering, the size of the product itself can be reduced. Further, since the outer periphery of the cooling fan is covered with the bracket, wind noise itself generated from the cooling fan can be suppressed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION
A motor unit having a bearing that rotatably supports both sides of a shaft of a rotor, a bracket that forms a housing of the motor unit, and an impeller fixed to one end of the shaft of the rotor, and a motor unit between the bearings. With a cooling fan for cooling, the dead space between the motor and the bracket can be used effectively, the cooling effect of the motor can be reduced, and the overall length of the electric blower can be shortened. Can be reduced in size. Further, since the outer periphery of the cooling fan is covered with the bracket, wind noise itself generated from the cooling fan can be suppressed.

According to a second aspect of the present invention, in the first aspect of the present invention, a cooling fan is provided between the impeller-side bearing and the rotor, and a dead fan between the load-side bearing and the rotor is provided. Since the space can be used effectively and the overall length of the electric blower can be shortened without lowering the cooling effect of the motor section, the size of the product itself can be reduced. Further, since the outer periphery of the cooling fan is covered with the non-load side bracket, wind noise itself generated from the cooling fan can be suppressed.

According to a third aspect of the present invention, in the first or second aspect, a cooling fan is provided between the anti-impeller side bearing and the rotor. Between the dead space
Since the overall length of the electric blower can be reduced without lowering the cooling effect of the motor section, the product itself can be reduced in size. Further, since the outer periphery of the cooling fan is covered with the non-load side bracket, wind noise itself generated from the cooling fan can be suppressed.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the air blown from the impeller is discharged to the outside without passing through the motor section. The motor section and the fan section having the impeller are partitioned, and when incorporated in an exhaust circulation type vacuum cleaner, the air blown out from the impeller can circulate without flowing into the motor section. The amount of circulating wind can be increased, and usability can be further improved.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the cooling air generated by the cooling fan flows from the impeller to the rotor. In order to preferentially cool the heat generating parts such as the armature winding and the field winding, the cooling effect of the winding part can be further improved when the temperature rise value of the winding part is high.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the cooling air generated by the cooling fan flows from the rotor side to the impeller side. In order to preferentially cool the heat generating portion of the commutator of the rotor and the carbon brush, the cooling effect of the commutator and the carbon brush can be further improved when the temperature rise value of the commutator and the carbon brush is high. It is possible to improve the life time of the electric blower.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the cooling fan is a radial fan, and the cooling air is discharged from the side surface of the non-load-side bracket. With this configuration, the characteristics of the radial fan can be advantageously used, so that the cooling effect of the motor unit can be greatly improved.

The invention according to an eighth aspect of the present invention is the invention according to the seventh aspect, wherein:
Since the partition plate fixed by the non-load-side bracket is provided, the rectifying function at the suction port of the radial fan is greatly improved, and the cooling effect of the motor unit can be greatly improved.

According to a ninth aspect of the present invention, in accordance with the seventh or eighth aspect of the present invention, the air blown from the radial fan is rectified between the outer periphery of the radial fan and the inner surface of the non-load side bracket to the outside. By providing the rectifying section for discharging, the rectifying action at the outlet of the radial fan is greatly improved, and the cooling effect of the motor section can be significantly improved. In addition, if the rectifying action on the blow-out side is improved, wind noise generated by the radial fan can be reduced.

According to a tenth aspect of the present invention, in accordance with the first aspect of the present invention, there is provided a motor unit in which an intake port of a cooling fan is provided near a heating unit of the motor unit. With the provision, the reliability of the motor unit can be further improved.

According to an eleventh aspect of the present invention, in the invention according to any one of the first to tenth aspects, a cut and raised portion is provided around an intake port and / or an exhaust port of the cooling fan. By providing the cut-and-raised portions in accordance with the flow directions of the intake air and the exhaust gas, the wind noise can be reduced and the rectifying action can be improved.

According to a twelfth aspect of the present invention, there is provided a dust collecting chamber for collecting dust, and an air intake portion communicating with the dust collecting chamber, wherein the dust collecting chamber is provided with any one of the first to eleventh aspects. With the electric vacuum cleaner provided with the electric blower described above, the vacuum cleaner body can be made quieter and smaller, and the usability can be improved.

[0027]

(Embodiment 1) Embodiment 1 of the present invention will be described below with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1, a cooling fan 90 for cooling the motor unit 29 is provided between the load-side bearing 36 and the armature core 38 of the rotor 45, and dead space in the motor unit 29 is effectively reduced. The cooling effect of the motor unit 29 can be improved without increasing the overall length of the electric blower 50 itself, and the outer periphery of the cooling fan 90 is covered with a non-load-side bracket 34 made of resin, an iron plate, or the like. Therefore, wind noise generated by the cooling fan 90 can be reduced. The impeller 31 is divided by the air guide 32 between the motor unit 29 and the fan unit 28 having the impeller 31 so that the wind blown out from the impeller 31 is directly discharged to the outside without passing through the motor unit 29. Since the air blown out from the fan 31 does not flow into the motor unit 29 and is entirely exhausted from the fan unit outlet 20, the amount of air discharged from the fan unit outlet 20 can be greatly increased. The direction of the cooling air generated by the cooling fan 90 is designed by designing the shape of the cooling fan 90 such that air is taken in from the load side and discharged from the non-load side (A direction) as shown in FIG. In order to preferentially cool the heat generating portions of the armature winding 39 on the load side and the field winding 41, the cooling effect of the winding portion can be further improved when the temperature rise value of the winding portion is high. it can. Conversely, the commutator 42 of the rotor 45 and the carbon brush are preferentially cooled by designing the shape of the cooling fan 90 so that air is drawn in from the non-load side and discharged from the load side (direction B). Therefore, when the temperature rise value of the commutator and the carbon brush (not shown) is high, the cooling effect of the heat generating portion of the holder (not shown) provided with the commutator 42 and the carbon brush (not shown) is increased. Thus, the reliability of the electric blower 50, such as the life time, can be improved.

When cooling the motor section 29, a propeller fan is often used as the cooling fan 90,
As shown in FIG. 2, the cooling fan 9 provided in the motor unit 29
0 is a radial fan, and the cooling air is discharged from the side of the bracket 34 on the non-load side so that the flow of air from the intake to the exhaust can be made smooth and the flow velocity can be greatly increased. The cooling effect of the second embodiment can be greatly improved. In order to further improve the cooling effect, a donut-shaped partition plate 96 is provided on the top surface of the blades of the cooling fan 90 having a radial fan shape, and is fixed to the inner surface of the non-load-side bracket 34 so that the radial fan shape is improved. Cooling fan 9
Since the wind is sucked in concentrated from the center portion of 0, the flow velocity is further increased, and the cooling effect can be improved. Further, a fan portion 2 is provided between the outer peripheral end of the cooling fan 90 having a radial fan shape and the inner surface of the non-load side bracket 34.
By providing the guide vanes 97, which are rectifiers that perform the same function as the air guide 32 of FIG. 8, further improvement of the cooling effect can be expected, and wind noise generated by the cooling fan 90 can be reduced.

(Embodiment 2) Embodiment 2 of the present invention will be described below.
This will be described with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

Contrary to the first embodiment, the cooling fan 90 of the motor unit 29 is provided on the non-load side, and the motor unit 29 is disposed between the non-load-side bearing 35 and the commutator 42 of the rotor 45.
By providing the cooling fan 90 of
Since the fan is provided at both ends of the shaft 37 which is the axis of the electric blower 1, the electric blower 1 has a good balance in the finished product,
Vibration can be reduced. The cooling fan 90
The direction of the cooling air generated by the armature on the load side is the same as that in the case where the cooling fan 90 is provided on the load side. Since the winding 39 and the field winding 41 are preferentially cooled, the cooling effect of the winding part can be further improved when the temperature rise value of the winding part is high. If the temperature is increased in the direction B discharged from the load side, the commutator 42 of the rotor 45 and the carbon brush are preferentially cooled. In addition, the cooling effect of the holder 44 having the carbon brush can be improved, and the reliability such as the life time of the electric blower 50 can be improved. Regarding the position where the motor unit intake port 70 is provided, regardless of whether the cooling fan 90 is provided on the load side or the non-load side, if the cooling fan 90 is provided in the motor unit 29 in the vicinity of the heat-generating component whose temperature rise value is to be suppressed. Thus, the reliability of the motor unit 29 can be further improved. In addition, FIG.
As shown in the figure, the motor unit intake port 70 and the motor unit exhaust port 7
With respect to 3, the cooling effect of the motor unit 29 is further improved by providing the cut-and-raised portion 101 with a bracket so that the cooling air easily flows into the motor unit 29 and exhaust gas is easily discharged to the outside of the motor unit 29. Can be.

Finally, as shown in FIG. 4, the electric blower 50 as described in the above embodiment is connected to the dust collecting chamber 4 for collecting dust.
And the case where the vacuum cleaner 1 is incorporated in the exhaust-circulation-type vacuum cleaner 1 having the suction part 102 communicating with the dust collecting chamber 4.
Since the total length of the electric blower 50 is shorter than before and the noise generated by the cooling fan 90 can be suppressed, the vacuum cleaner 1 can be made quieter and smaller, and the usability can be improved. Becomes

[0033]

According to the present invention, by providing a cooling fan for cooling the motor section inside the motor section, it is possible to reduce noise and reduce the size.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an electric blower showing a first embodiment of the present invention.

FIG. 2 is a partially broken side view of the electric blower when a radial fan is used.

FIG. 3 is a partially cutaway side view of an electric blower showing a second embodiment of the present invention.

FIG. 4 is a partially cutaway overall view of a vacuum cleaner equipped with the electric blower of the present invention.

FIG. 5 is a partial cutaway overall view of a vacuum cleaner equipped with a conventional electric blower.

FIG. 6 is a partially cutaway side view of the electric blower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner 2 Vacuum cleaner main body 4 Dust collection room 19 Fan part intake port 20 Motor part exhaust port 28 Fan part 29 Motor part 30 Casing 31 Impeller 32 Air guide 33 Load side bracket 34 Non-load side bracket 35 Load side bearing 36 Counter Load-side bearing 37 Shaft 40 Field core 41 Field winding 45 Rotor 46 Stator 50 Electric blower 90 Cooling fan 96 Partition plate 97 Guide wing 101 Cutting up

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Yoshitaka Murata, Inventor 1006, Kazuma, Kadoma, Osaka, Japan Matsushita Electric Industrial Co., Ltd. 72) Inventor Seiji Yamaguchi 1006 Kazuma Kadoma, Osaka Prefecture F-term (reference) 3B006 AA00 FA01 FA02 LA00 5H607 AA04 AA12 BB01 BB05 BB14 CC01 CC05 DD19 FF04 5H609 BB06 BB15 BB19 PP02 QP13 Q03 Q03

Claims (12)

[Claims] A motor having a bearing rotatably supporting both sides of a shaft of a rotor; a bracket forming a housing of the motor; and an impeller fixed to one end of a shaft of the rotor; An electric blower with a cooling fan for cooling the motor between bearings. 2. The electric blower according to claim 1, wherein a cooling fan is provided between the impeller-side bearing and the rotor. 3. The electric blower according to claim 1, wherein a cooling fan is provided between the non-impeller side bearing and the rotor. 4. A motor section and a fan section having the impeller are partitioned so that the wind blown out from the impeller is discharged to the outside without passing through the motor section. Electric blower. 5. The electric blower according to claim 1, wherein cooling air generated by the cooling fan flows from the impeller to the rotor. 6. The electric blower according to claim 1, wherein cooling air generated by the cooling fan flows from the rotor side to the impeller side. 7. The electric blower according to claim 1, wherein the cooling fan is a radial fan, and the cooling air is discharged from a side surface of the non-load-side bracket. 8. The electric blower according to claim 7, wherein a partition plate fixed by a non-load side bracket is provided on an intake side of the radial fan. 9. The electric blower according to claim 7, further comprising a rectifying portion between the outer periphery of the radial fan and the non-load-side bracket for rectifying the air blown from the radial fan and discharging the rectified air to the outside. 10. The electric blower according to claim 1, wherein an intake port of the cooling fan is provided near a heat generating portion of the motor portion. 11. The electric blower according to claim 1, wherein cut-and-raised portions are provided around an intake port and / or an exhaust port of the cooling fan. 12. A vacuum cleaner comprising: a dust collection chamber for collecting dust; and an intake unit communicating with the dust collection chamber, the vacuum cleaner including the electric blower according to any one of claims 1 to 11. .