JP2003135337A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner which can prevent drop in sucking power while realizing higher durability. SOLUTION: The vacuum cleaner is provided with a suction device 3 for sucking dusts, a dust collection part 11 which makes streams of air containing the dusts sucked whirl by a cyclone action to separate the dusts from the air stream and an electric fan for generating sucking force on the downstream side of the dust collection part 11 and a brushless motor 25 is mounted as the electric fan. This eliminates loss in sliding of a carbon brush having the conventional commutator motor, loss in copper of the armature winding and the like to improve the efficiency of the motor and restricts a drop in the sucking power while realizing higher durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner used in general households.

[0002]

2. Description of the Related Art A conventional cyclone type vacuum cleaner will be described with reference to FIGS. In FIG. 9, an electric vacuum cleaner 1 has a suction tool 3 attached to an extension tube 2 for sucking dust, and the extension tube 2 is provided with a vacuum cleaner main body via a hand handle 4 and a hose 6 with a hose joint 5. 7 (hereinafter referred to simply as the main body). The main body 7 includes one front wheel caster 8 and a pair of rear wheels 9. As shown in FIG. 12, a recess 10 formed in the front of the main body 7
A cyclone dust collecting unit 11 is detachably attached to the. Behind the concave portion 10 of the main body 7, an electric blower 12 or the like that generates a suction force is incorporated. This electric blower 12
The suction side of the is communicated with the air suction portion 14 through the opening 13. The air suction part 14 is surrounded by an inclined sealing surface 15 that abuts the cyclone dust collecting part 11 when the cyclone dust collecting part 11 is placed. An exhaust filter 16 is also provided at the rear of the main body 7, and the exhaust gas from the electric blower 12 passing through the exhaust filter 16 is discharged to the outside of the main body 7 as indicated by the arrow in FIG. The other components, that is, a power supply system such as a control unit (not shown), a cord winding device (not shown), and the like are built in 7.

A front wall 18 of the main body 7 stands up from a bottom wall 19, and this bottom wall 19 is the lower end surface of the recess 10. An intake port 20 for detachably connecting the hose joint 5 is provided at substantially the center of the front wall 18. The seal packing 21 is attached to the end surface of the intake port 20 on the concave portion 10 side to prevent air leakage between the intake port 20 and the cyclone dust collecting portion 11.

Further, a conventional cyclone type electric vacuum cleaner 1
As shown in FIG. 13, a commutator motor is used for the. This will be explained further. 33 is a stator in which a field winding (omitted) is applied to a stator core 39, 32 is an armature winding (schematic) 55 is applied to a rotor core 37 passed through a shaft 34, and a commutator 56 is arranged coaxially. The rotor is rotatably fixed by a first bearing 35 and a second bearing 36 provided at both ends of the shaft 34.
The stator 33 and the rotor 32 are the load side bracket 30,
The pair of carbon brushes 57 is fixed to the anti-load side bracket 31, and the pair of carbon brushes 57 are attached to the anti-load side bracket 31.
The motor portion 60 is formed by inserting the motor portion 60 through the.
Reference numeral 59 is an exhaust port.

Further, an impeller 48 is provided on the shaft 34 of the output shaft, an air guide 49 forming an air passage is arranged on the outer peripheral portion of the impeller 48, and a casing 50 is provided.
Are attached so as to cover them to form the electric blower 12.

In the above structure, when electric power is supplied, the current conducted through the field winding is transmitted to the commutator 56 through the carbon brush 57, and the magnetic flux generated in the stator core 39 and the current passing through the armature winding 55. A force is generated between them and the rotor 32 rotates. Next, as the rotor 32 rotates, the impeller 4 fixed to the shaft 34 of the rotor 32
8 rotates to accelerate the air in the impeller 48, and the accelerated air is decelerated by the air guide 49 to flow inside the motor, and the rotor 32, the stator 33, and the carbon brush 57.
While cooling the air outlet 59 of the anti-load side bracket 31
More discharged.

When the electric blower 12 is driven as described above, intake air is taken in from the intake port of the suction tool 3, and the intake air flows into the cyclone dust collecting portion 11 via the extension pipe 2 and the hose 6. As shown in FIG. 10, the intake air in the cyclone dust collecting portion 11 flows in through the suction port 11a and swirls in the separation chamber 11b as shown by the arrow a to separate and remove dust by the cyclone action. The separated dust is accumulated in the dust chamber 11c as shown in b, and the intake air is discharged from the cleaner main body 7 to the outside from the separation chamber 11b by the suction force of the electric blower 12.

[0008]

In the conventional cyclone type electric vacuum cleaner using such a commutator motor, since the pressure loss of the cyclone dust collecting section 11 is large, the suction work is higher than that of the paper bag type electric vacuum cleaner. There was a problem that the rate decreased.

Further, since the cyclone dust collecting portion 11 separates the air flow and the dust by centrifugal force, the dust collecting portion 1 can surely collect even fine dust.
It is difficult to collect dust at 1, and fine dust that cannot be completely collected enters the electric blower 12 and accumulates in the vicinity of the commutator 56, which causes a problem in durability as the electric blower 12 and the electric vacuum cleaner 1. Had.

The present invention solves the above problems, and an object of the present invention is to provide an electric vacuum cleaner capable of preventing a decrease in suction power and improving durability.

[0011]

In order to achieve the above object, the present invention provides a suction tool for sucking dust and an air stream containing the dust sucked from the suction tool, which is swirled by a cyclone action to separate the air stream from the dust. An electric vacuum cleaner equipped with a brushless motor as the electric blower, which is equipped with a dust collecting section for collecting and collecting dust and an electric blower generating a suction force on the downstream side of the dust collecting section, and a carbon brush included in a conventional commutator motor. The sliding loss, the copper loss in the armature winding, etc. are eliminated, the efficiency of the motor is improved, and the reduction of the suction power of the electric vacuum cleaner can be suppressed. In addition, because it is a brushless motor, fine dust that could not be collected completely entered the electric blower,
Problems that accumulate on the commutator portion can be solved, and the durability of the electric blower and the electric vacuum cleaner can be improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
A suction tool for sucking dust, a dust collection section for swirling an air stream containing dust sucked from the suction tool by a cyclone action to separate the air stream and dust, and a suction force on the downstream side of the dust collection section. An electric vacuum cleaner equipped with a generated electric blower and equipped with a brushless motor as the electric blower, which eliminates sliding loss of a carbon brush of a conventional commutator motor, copper loss in an armature winding, etc., and improves motor efficiency. Is improved, and a decrease in suction power of the vacuum cleaner can be suppressed. In addition, the brushless motor can increase the speed, which can reduce the size and weight of the electric blower, leading to the reduction in size and weight of the electric vacuum cleaner. Further, since the brushless motor is used, it is possible to solve the problem that fine dust that cannot be collected completely enters the electric blower and accumulates on the commutator portion, and the durability of the electric blower and the electric vacuum cleaner can be improved.

According to the second aspect of the present invention, the rotation speed of the brushless motor is set to 45000 rpm or higher in any of the air volume ranges of the vacuum cleaner actually used. Since the impeller and the rotor core can be made smaller, the electric blower itself can be made smaller and lighter, and a highly usable electric vacuum cleaner can be provided.

According to a third aspect of the present invention, the rotation speed of the brushless motor is 45,000 rp in any of the regions of 1.0 m ³ / min or more of the actual air flow of the vacuum cleaner.
The maximum power point is usually set to 1.0 m ³ / min or more in actual use, so it is possible to suppress a decrease in suction power of the vacuum cleaner during actual use. An electric vacuum cleaner with high usability can be provided.

According to a fourth aspect of the present invention, the power consumption at the maximum air volume during operation of the vacuum cleaner is about 1000 W.
It uses a brushless motor, which can maximize the suction force of the vacuum cleaner.

According to a fifth aspect of the present invention, a battery is used as a means for supplying electric power to the electric blower, and a power supply circuit for converting alternating current into direct current is unnecessary, so that the efficiency of the electric blower is improved. It is possible to provide an electric vacuum cleaner having improved suction power.

In the invention according to claim 6 of the present invention, both a commercial AC power source and a battery can be used as power supply means to the electric blower, and usability and convenience are further improved.

[0018]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, an electric vacuum cleaner 1 includes a suction tool 3 attached to an extension tube 2 for sucking dust.
The extension tube 2 is connected to a cleaner body 7 (hereinafter simply referred to as a body) via a handle 4 and a hose 6 with a hose joint 5. The main body 7 includes one front wheel caster 8 and a pair of rear wheels 9. Further, as shown in FIG. 2, a cyclone dust collecting portion 11 is detachably attached to the recess 10 formed in the front of the main body 7. The structure and operation of the cyclone dust collecting unit 11 are the same as those of the conventional example, and thus the description thereof will be omitted in this embodiment. A brushless motor 25 that generates a suction force is built in behind the recess 10 of the main body 7. The suction side of the brushless motor 25 communicates with the air suction portion 14 through the opening 13. The air suction part 14 is surrounded by an inclined sealing surface 15 that abuts the cyclone dust collecting part 11 when the cyclone dust collecting part 11 is placed. An exhaust filter 16 is also provided at the rear of the main body 7, and the exhaust gas from the brushless motor 25 passing through the exhaust filter 16 is discharged to the outside of the main body 7 as indicated by the arrow in FIG. 7, other components, that is, an inverter drive circuit 17, a power supply circuit 22 such as a rectifying circuit, a control circuit 24 of the main body, a cord winding device 23, etc. are built in.

The front wall 18 of the main body 7 stands up from the bottom wall 19, and this bottom wall 19 is the lower end surface of the recess 10. An intake port 20 for detachably connecting the hose joint 5 is provided at substantially the center of the front wall 18. The seal packing 21 is attached to the end surface of the intake port 20 on the concave portion 10 side to prevent air leakage between the intake port 20 and the dust collection case 11.

Further, as shown in FIG. 3, the brushless motor 25 operated by the inverter control is large and is composed of a motor section 54 and a fan section 53.

The motor section 54 includes a load side bracket 30, an anti-load side bracket 31, and a rotor 32 which form a casing.
And the stator 33.

The rotor 32 is rotatably provided on the load side bracket 30 and the anti-load side bracket 31, respectively, via a first bearing 35 and a second bearing 36 provided on a shaft 34.

The rotor 32 has a substantially donut shape,
A rotor core 37, which is formed by laminating silicon steel plates having a plurality of holes by a desired lamination thickness, is thickly inserted into the shaft 34. A plurality of permanent magnets (not shown) are inserted into the plurality of holes of the rotor core 37 substantially in parallel with the shaft 34 to generate a magnetic field. Also, the shaft 3 of the rotor 32
In addition to the rotor core 37, a sensor magnet 38 for emitting information on the rotational position of the rotor is also coaxially press-fitted in the shaft 4.

The stator 33 is roughly divided into a stator core 39 and a winding 40, and the winding 40 is formed in a plurality of slots (not shown) of the stator core 39 formed by laminating silicon steel plates by a desired stacking thickness. And the anti-load side bracket 31
Fixed to.

The position detecting means for detecting the rotational position of the rotor 32 necessary for controlling the brushless motor 25 is constituted by a position detecting element 41 such as a hall element for detecting the magnetic pole of the sensor magnet 38 provided in the rotor 32. The anti-load side bracket 31 and the load side bracket 30
It is mounted and provided on the detection substrate 42 fixed to the.
The output signal of the position detection element 41 is connected to the inverter drive circuit 17 of the brushless motor 25 by the position detection signal line 43. The inverter drive circuit 17 that drives the brushless motor 25 is equipped with a power supply line 44 that supplies power to the brushless motor 25, a signal line that transmits an operation signal and a rotation speed control signal from the control circuit 24 of the cleaner body, and the like. The brushless motor 25 is disposed in the vicinity of the brushless motor 25.
The heat-generating components such as the switching element 45 mounted on the inverter drive circuit 17 are attached to the cooling radiating fins 46, and the radiating fins 46 are mounted on the brushless motor 2.
5 is arranged on the ventilation passage in the vicinity of the suction port 47 and the like.

The fan portion 53 is arranged on the impeller 48 provided on the shaft 34 of the motor portion 54 and the outer peripheral portion of the impeller 48, and gradually recovers the pressure of the airflow flowing out of the impeller 48 while the load side of the motor portion 54. An air guide 49 that forms an air passage leading to the upper surface of the bracket 30 and a casing 50 are provided so as to cover the air guide 49.
Is integrally attached to the load side bracket 30 or the anti-load side bracket 31.

Next, the air flow of the electric blower will be described. When power is supplied to the brushless motor 25 and an operation signal is input from the control circuit 24 of the cleaner body, the brushless motor 25 rotates and the impeller 48 provided on the shaft 34 also rotates. When the impeller 48 rotates, air flows from the vicinity of the center of the impeller 48 toward the outer circumference of the impeller 48, and the air flow discharged from the outer circumference of the impeller 48 passes through the air passage of the air guide 49 and the air guide 49.
At the outer peripheral portion, the direction is changed by about 180 degrees and the brushless motor 25 is introduced. The airflow flowing into the brushless motor 25 cools the rotor 32, the stator 33 and the like, and is discharged from the exhaust port 51 provided in the anti-load side bracket 31.

Next, the suction power of the electric vacuum cleaner will be described.

The suction power of the vacuum cleaner is one value indicating the suction capacity of the vacuum cleaner, and it is very important to improve the suction power in terms of the function of the vacuum cleaner.

The suction power is expressed by multiplying the air volume x the degree of vacuum by a constant, and is derived from the aerodynamic characteristics of the electric blower and the ventilation loss determined by the ventilation resistance of the ventilation path of the electric vacuum cleaner. . The suction power of the electric vacuum cleaner is the suction power of the vacuum cleaner having the maximum suction power in the suction air volume range, and the air volume at that time is called the operating air volume. The power consumption currently used for general household use is about 10
In the case of a vacuum cleaner of 00W, if it is classified as a high suction power, the suction power exceeds 500W, and the operating air volume is
The range is approximately 1.0 to 1.6 m ³ / min.

Further, the suction power is (suction power) =
(Fan output of electric blower)-(Ventilation loss of vacuum cleaner body). It is necessary to improve fan output or reduce body ventilation loss to improve suction work rate. The ventilation loss of the main body can be reduced by, for example, increasing the inner diameter of the hose or increasing the size of the main body. However, this reduces the usability of the vacuum cleaner and is difficult to employ.

One fan output can be represented by fan output = input of electric blower × motor efficiency × fan efficiency, and the product of motor efficiency and fan efficiency is called electric blower efficiency (motor fan efficiency). Call. In order to improve the fan output, each of the input of the electric blower and the efficiency of the electric blower (= motor efficiency × fan efficiency) should be improved, but the input of the electric blower = the power consumption of the vacuum cleaner is already 1000W class. Is the mainstream, and considering the current trend of energy saving, it is not desirable to increase the power consumption more than home appliances, and if energy saving is ignored and the power consumption is increased to over 1000W, heat generation will increase and the temperature will rise. It is necessary to increase the size of the electric blower from the viewpoint of the reliability of the electric motor, such as rising, leading to an increase in the weight of the electric blower, and thus the main body of the electric vacuum cleaner is large.
Moreover, it becomes heavy and the usability is impaired. In order to improve the fan output, it is necessary to improve the efficiency of the electric blower, that is, the motor efficiency and the fan efficiency.

Means for improving the fan output of the electric blower will be described below.

FIG. 4 shows the results of calculating the motor efficiency, fan efficiency and electric blower efficiency with respect to the rotation speed. Although this differs depending on the parts, materials, shapes, configurations, methods used, etc., it shows an example in which the respective efficiencies were obtained under the conventional configuration conditions.

In FIG. 4, the motor efficiency of the brushless is higher than that of the commutator. This is because in the case of a commutator motor, sliding loss due to friction between the commutator and the carbon brush during rotation, copper loss in the rotor winding, and the like are large, and these losses are zero in the brushless motor. In the case of a brushless motor, the loss due to heat generation of the switching element on the inverter drive circuit and the heat loss at the rectifier circuit occur, but it is smaller than the loss at the commutator motor. It is also possible to rectify the current value on the secondary side to reduce the loss. From such a point, the efficiency of the brushless motor driven by the inverter becomes high.

When the number of rotations of the motor is increased,
Sliding loss due to friction between the commutator and the carbon brush during rotation, and bearing loss, which is also one of the mechanical losses.
Also, although the contribution is small, there is a friction loss (wind loss) with the surrounding air that the rotor receives during rotation, and an eddy current loss of the core that increases as the switching frequency of the magnetism generated in the winding becomes faster. It is increasing and efficiency is decreasing. In addition, in the case of conventional commutator motors, power is transmitted by the sliding motion of the commutator and the carbon brush during rotation, so the strength of the commutator against centrifugal force and the stability of commutation during high-speed rotation are stable. Performance is reduced, sparks are generated, and the motor unit 5
The reliability of 4 cannot be secured. Therefore, it is necessary to use a brushless motor instead of the conventional commutator motor in order to realize high speed. When a brushless motor is used to increase the speed, the switching element loss (heat loss), which is an electrical loss that increases as the rotation speed increases and the current switching speed to the winding increases, tends to increase. However, a large friction loss between the commutator and the carbon brush does not occur as compared with the commutator motor, which leads to an improvement in efficiency.

Further, in the fan section 53, when the speed of a specific impeller is increased, the friction loss due to the friction between the outer surface of the impeller and the ambient air, the primary flow loss of the air flow flowing inside the impeller, and the secondary flow of the air flow. Losses tend to increase. However, when aiming for a constant fan output,
Since the outer diameter of the impeller can be set smaller by increasing the rotation speed, the surface area of the impeller, which is a rotating body, is reduced, and friction loss and the airflow passage length inside the impeller can be shortened. Flow loss, secondary flow loss, etc. are reduced. Taking these into account, considering that the shape of the impeller is also appropriately changed according to the number of revolutions, the fan efficiency is improved along with high speed rotation up to a certain number of revolutions.

From the above, considering the efficiency of the electric blower, in the case of a brushless motor, the efficiency is increased to about 45,000 r / min by setting the current speed of the commutator motor to about 40000 r / min. The efficiency exceeds 50% from around min. About 60,000r
It can be seen that the efficiency peaks at around / min, and it is possible to achieve high efficiency exceeding about 53%. Further, it can be seen that in the rotational speed region of about 70,000 r / min or more, mechanical loss and other losses increase remarkably, leading to a decrease in efficiency. Therefore, in order to improve the efficiency of the electric blower, if it is set to 45000 r / min to 70000 r / min, the efficiency of the brassless motor is higher than that of the brassless motor in the entire rotation speed range of the commutator motor, and , It is clear that it will be advantageous. Furthermore, if the power consumption of the electric blower is set to the maximum of 1000 W, the output base (suction work rate) increases because the input base increases.
The highest-performance vacuum cleaner can be realized.

Next, FIGS. 5 and 6 show the results showing the relationship between the shapes and masses of the motor section 54 and the fan section 53 with respect to the rotational speed. Similar to the above efficiency calculation result, an example is shown in which each shape and mass are obtained under the conventional configuration conditions, although it differs depending on the parts, materials, shapes, configurations, methods, etc. used.

In FIGS. 5 and 6, when the motor unit 54 speeds up the number of revolutions, realizing the speedup with constant power consumption means that the load on the motor unit 54 is reduced. Since the magnetic flux density can be magnetically reduced, the number of windings and cores of the stator can be reduced. Specifically, the reduction of the core can reduce the outer diameter of the core and reduce the laminated thickness. In particular, the core has a large contribution to the shape and mass of the motor portion 54, that is, contributes greatly to the shape and mass reduction of the motor portion 54.

In the fan portion 53, as described above, the outer diameter of the impeller can be set small by increasing the rotation speed, which greatly contributes to the shape and mass reduction of the fan portion 53.

Since the shape and the mass can be reduced as the speed is increased, the size and the mass of the cleaner main body can be contributed by setting the speed at 45000 r / min or more like the efficiency.

In summary, in the case of a cyclone type electric vacuum cleaner having a large passage pressure loss, if a brushless motor driven by an inverter, which has a higher motor efficiency than the conventional commutator motor, is used, the suction performance is improved. The most basic element required for an electric vacuum cleaner is improved dust removal performance, and it is possible to provide a user-friendly electric vacuum cleaner. Also,
Since the brushless motor does not have a commutator or a carbon brush, the reliability is not extremely deteriorated even if it is rotated at a high speed. Further, in terms of efficiency, higher speed is more advantageous, and as a result, the electric blower can be made smaller and lighter. In order to swirl the dust in the cyclone dust collecting section, using a high-speed brushless motor in a cyclone type vacuum cleaner with a larger dust collecting section than the conventional paper pack type vacuum cleaner makes it possible to reduce the size of the vacuum cleaner body. It also leads to weight reduction. Also,
In order to bring out the suction performance of the electric blower to the upper limit, it is most effective to raise the power consumption of the electric vacuum cleaner to the maximum of 1000W.

As described above, according to this embodiment, by using the brushless motor having high speed and high input in the cyclone type electric vacuum cleaner having a large passage pressure loss, the suction performance is maximized and the dust removing property is improved. It is possible to provide a small, lightweight electric vacuum cleaner that is good.

Another advantage of using the brushless motor is that carbon powder is not mixed in the exhaust because there is no carbon brush. for that reason,
If a high-performance filter is installed immediately after the cyclone dust collecting part, clean exhaust can be maintained without inserting a filter behind the motor. Therefore, the number of parts can be reduced and the cost can be reduced. Further, since the brushless motor can output information regarding the number of rotations, it can be monitored and the motor can be controlled. As long as the relationship between rotation speed and pressure is clarified, the motor can be controlled without using a pressure sensor, etc.
Since the variation of the motor section 54 is not included, accurate control is possible.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 52 denotes a battery for supplying electric power to the electric vacuum cleaner, which is charged by a dedicated charger (not shown), and can be repeatedly charged and used when the battery 52 is exhausted. Further, since it is driven by direct current, the power supply circuit 22 such as a rectifier circuit for converting alternating current into direct current, which is mounted in the first embodiment, is not necessary.

As described above, according to this embodiment, since the electric power is supplied from the battery 52 provided in the cleaner main body 7, the cord can be operated without the troublesome operation of the cord, which is difficult in the conventional AC electric vacuum cleaner. It is possible to provide the electric vacuum cleaner 1 having excellent properties and usability. Further, the power supply circuit 22 such as a rectifier circuit, which is indispensable in the AC type, is not required, and the efficiency can be further improved by reducing the loss by that amount, and a stronger suction performance can be obtained when compared with the same power consumption as the AC type. It is a thing.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those of the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 52 is a battery for supplying DC power to the vacuum cleaner, and 23 is a cord winding device for supplying commercial power. Reference numeral 22 is a power supply circuit provided with a switching device for switching between alternating current and direct current.

As described above, according to the present embodiment, when cleaning is required for a long time, the AC power supply can be switched to use, and when it is desired to prioritize the operability of the cleaner, it can be switched to DC. , Very convenient.

[0050]

According to the present invention, it is possible to provide an electric vacuum cleaner which prevents a reduction in suction power, realizes a reduction in size and weight and an improvement in durability.

[Brief description of drawings]

FIG. 1 is a side view of an electric vacuum cleaner showing a first embodiment of the present invention.

FIG. 2 is a sectional view of the same electric vacuum cleaner body.

FIG. 3 is a sectional view of an electric blower of the vacuum cleaner.

FIG. 4 is a rotational speed-efficiency diagram of the electric blower.

FIG. 5 is a rotational speed-mass diagram of the electric blower.

FIG. 6 is a rotational speed-outer diameter diagram of the electric blower.

FIG. 7 is a sectional view of a vacuum cleaner body showing a second embodiment of the present invention.

FIG. 8 is a sectional view of an electric vacuum cleaner body showing a third embodiment of the present invention.

FIG. 9 is a side view of a conventional vacuum cleaner.

FIG. 10 is a sectional view taken along line AA of FIG. 9 (cyclone dust collecting portion).

FIG. 11 is a sectional view taken along line BB of FIG. 9 (cyclone dust collecting portion).

FIG. 12 is a partial cross-sectional view of the same electric vacuum cleaner body.

FIG. 13 is a sectional view of the electric blower.

[Explanation of symbols]

3 suction tool 11 Cyclone dust collector 17 Inverter drive circuit 25 brushless motor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshitaka Murata             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Tsuyoshi Tokuda             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Toshiaki Fujiwara             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Kazuhisa Morishita             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Sadataka Hayami             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 3B006 FA01                 3B057 DA01 DE02                 3B062 AH01 AH05

Claims (6)

[Claims] 1. A suction tool for sucking dust, a dust collecting section for swirling an air stream containing the dust sucked from the suction tool by a cyclone action to separate the air stream and the dust, and a downstream of the dust collecting section. An electric vacuum cleaner equipped with an electric blower that generates suction force on its side, and equipped with a brushless motor as the electric blower. 2. The vacuum cleaner according to claim 1, wherein the rotation speed of the brushless motor is set to 45000 rpm or higher in any of the air volume ranges of the vacuum cleaner in actual use. 3. The actual air flow of the vacuum cleaner is 1.0 m ³
The vacuum cleaner according to claim 1 or 2, wherein the number of revolutions of the brushless motor is set to 45000 rpm or more in any of the regions of / min or more. 4. The electric vacuum cleaner according to claim 1, wherein a brushless motor whose power consumption at the maximum air volume during operation of the electric vacuum cleaner is approximately 1000 W is used. 5. The electric vacuum cleaner according to claim 1, wherein a battery is used as a means for supplying electric power to the electric blower. 6. The electric vacuum cleaner according to any one of claims 1 to 4, wherein both a commercial AC power source and a battery can be used as a means for supplying electric power to the electric blower.