JP2004060514A - Motor-driven blower and electric vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven blower and an electric vacuum cleaner of high reliability capable of precluding a drop in suction power and preventing dust from intruding. <P>SOLUTION: The motor-driven blower having an inverter motor part is furnished with a plurality of bearings 17 holding an output shaft 13, each 17 being composed of an inner ring 29, an outer ring 30 and a plurality of balls 31, and at least one of the bearings 17 has one end held by the outer ring 30 and other end having a contact type seal part 32 contacting with and sliding on the inner ring 29, wherein dust intrusion into the bearings 17 can be precluded even if fine dust is inhaled, and it is possible to accomplish the intended motor-driven blower of high reliability without dropping the lifetime of the bearings 17. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric blower used for a vacuum cleaner.
[0002]
[Prior art]
A conventional centrifugal vacuum cleaner will be described with reference to FIGS.
[0003]
As shown in FIGS. 11 and 12, in the vacuum cleaner 1, a hose 3 is detachably connected to a cleaner body 2, and a distal end pipe 4 forming an operation unit is provided at the other end of the hose 3. I have.
[0004]
An extension pipe 5 and a suction tool 6 for sucking dust are detachably connected to the tip pipe 4. A centrifugal separation type dust collection unit 8 that communicates with the hose 3 and swirls and collects dust sucked together with air from the suction tool 6 is detachably mounted in a recess 7 formed in front of the cleaner body 2. Have been.
[0005]
An electric blower 9 for generating a suction force, an exhaust filter 10, a circuit control device (not shown), a cord winding device (not shown), and the like are provided behind the main body concave portion 7.
[0006]
Further, the conventional centrifugal vacuum cleaner 1 uses an electric blower 9 driven by a commutator motor 11 as shown in FIG. Reference numeral 12 denotes a rotor in which a commutator 14 and a rotor core 15 are press-fitted into an output shaft 13 and a rotor coil 16 is wound around the rotor core 15 via an insulating material. Bearings 17 are press-fitted into both ends of the output shaft 13 of the rotor 12, and are supported by a load-side bracket 18 and a non-load-side bracket 19, which are casings. Reference numeral 20 denotes a brush holder made of metal having a built-in carbon brush 21 and held by the non-load side bracket 19. Reference numeral 22 denotes a stator in which a stator coil 24 is wound around a stator core 23 via an insulating material. Further, an impeller 25 is fixed to the output shaft 13, and an air guide 26 that forms a ventilation path is provided on an outer periphery thereof, and a casing 27 is attached so as to cover these. Further, an exhaust port 28 is provided in the non-load side bracket 19. The bearing 17 has a plurality of balls 31 built in between an inner ring 29 and an outer ring 30, and the balls 31 are held by a retainer (not shown). It is configured to be covered.
[0007]
In the above configuration, when power is supplied, a magnetic field is generated by the current flowing through the stator coil 24. A current also flows through the carbon brush 21 and the commutator 14 to the rotor coil 16 arranged in the magnetic field. At this time, an electromagnetic force acts on the rotor coil 16 in accordance with the “Fleming's left hand rule” to generate torque, and the rotor 12 rotates. Next, when the rotor 12 rotates, the impeller 25 fixed to the output shaft 13 of the rotor 12 rotates to suck air. The sucked air is discharged from the outer periphery of the impeller 25, guided into the motor 11 via the air guide 26, and discharged from the exhaust port 28.
[0008]
When the electric blower 9 is driven as described above, dust is sucked together with air from the suction tool 6, and flows into the centrifugal separator 8 via the extension pipe 5 and the hose 3. The air and the dust swirl in the centrifugal dust collecting section 8, and only the dust is separated by the centrifugal force, and only the clean air is discharged to the outside of the cleaner main body 2 through the electric blower 9.
[0009]
[Problems to be solved by the invention]
When the conventional commutator motor having such a configuration is employed particularly in the electric vacuum cleaner 1 having a centrifugal dust collecting unit, the centrifugal dust collecting unit 8 causes a large pressure loss due to the swirling of the suction air, thereby reducing the electric power. There is a problem that the suction power of the vacuum cleaner is reduced.
[0010]
In addition, it is possible to improve the suction power by adopting an inverter motor that can rotate at a high speed to turn the dust there, but the improvement of the suction force increases the dust entering the electric blower. However, there is a problem that the rotation performance of the inverter motor is impaired.
[0011]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a highly reliable electric blower and a vacuum cleaner that prevent a reduction in suction power and prevent dust from entering.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a brushless motor unit having a stator and a freely rotating rotor, an impeller provided on an output shaft of the rotor, and an inverter circuit unit for controlling power of the brushless motor unit. A casing that covers the impeller and the brushless motor portion; and a plurality of bearings that hold the output shaft to the casing. The bearing includes a pair of inner and outer rings and a plurality of balls. At least one has a configuration in which one end is held by the outer ring and the other end has a contact-type seal portion that contacts and slides with the inner ring, so that even if fine dust is sucked into the electric blower, the inside of the bearing is not changed. Highly reliable electric ventilation without reducing the life of bearings even at high speeds It can be realized.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the first aspect of the present invention, there is provided a brushless motor unit having a stator and a freely rotatable rotor, an impeller provided on an output shaft of the rotor, and an inverter circuit unit for controlling power of the brushless motor unit. A casing that covers the impeller and the brushless motor portion; and a plurality of bearings that hold the output shaft to the casing. The bearing includes a pair of inner and outer rings and a plurality of balls. At least one has a configuration in which one end is held by the outer ring and the other end has a contact-type seal portion that contacts and slides with the inner ring, so that even if fine dust is sucked into the electric blower, the inside of the bearing is not changed. A highly reliable electric blower that does not reduce the life of the bearing even at high speeds It can be current.
[0014]
According to the invention of claim 2 of the present invention, the lower surface of the seal portion comes into contact with and slides with the inner ring, so that a highly reliable electric blower can be realized without reducing the life of the bearing even at high speed rotation. The cost can be reduced.
[0015]
According to a third aspect of the present invention, there is provided a brushless motor unit having a stator and a freely rotatable rotor, an impeller provided on an output shaft of the rotor, and an inverter circuit unit for controlling power of the brushless motor unit. A casing that covers the impeller and the brushless motor portion; and a plurality of bearings that hold the output shaft to the casing. The bearing includes a pair of inner and outer rings and a plurality of balls. A substantially disk-shaped slinger for preventing intrusion of dust is provided at least in the vicinity of at least one. Further, dust intrusion into the bearing can be prevented, so that the life of the bearing is not reduced even during high-speed rotation. A highly reliable electric blower can be realized.
[0016]
The invention according to claim 4 of the present invention provides a substantially disk-shaped slinger on the impeller side of the bearing and abuts the casing, and the slinger slides on the casing with the rotation of the output shaft. Dust intrusion is further reduced, and the life of the bearing is not reduced even during high-speed rotation, so that a more reliable electric blower can be realized.
[0017]
According to the invention of claim 5 of the present invention, a substantially disk-shaped slinger is provided on the impeller side of the bearing and fixed to the casing, and the output shaft rotates in the slinger, thereby suppressing loss due to friction of the slinger. It is possible to prevent a decrease in efficiency.
[0018]
In the invention according to claim 6 of the present invention, a substantially disk-shaped slinger is provided on the impeller side of the bearing and abuts against a seal member fixed to the casing, and the slinger slides on the seal member as the output shaft rotates. Therefore, it is possible to completely prevent dust from entering the bearings and realize a highly reliable electric blower.
[0019]
According to a seventh aspect of the present invention, the surface of the inverter circuit portion is coated with a water-resistant potting material, which prevents the destruction of circuit elements when a conductive liquid such as water is sucked. As a result, a highly reliable electric blower can be realized.
[0020]
The invention according to claim 8 of the present invention is characterized in that the electric blower according to any one of claims 1 to 7 is incorporated in a cleaner body and communicates with a suction device that sucks dust, and is small in size.・ A lightweight, high suction power and highly reliable vacuum cleaner can be realized.
[0021]
According to a ninth aspect of the present invention, there is provided an electric blower having a brushless motor unit which emits suction air, a vacuum cleaner main body having a centrifugal dust collecting unit for turning dust and centrifugally separating the dust, the electric blower and the electric blower. It is provided with a suction device that communicates with the centrifugal dust collecting unit, sucks dust, and has a filter that captures dust on the upstream side of the intake of the electric blower, without reducing the life of the bearing even at high speed rotation. A highly reliable vacuum cleaner can be realized.
[0022]
【Example】
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. Note that the same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.
[0023]
As shown in FIG. 1, the vacuum cleaner 1 has a hose 3 detachably connected to a cleaner body 2, and a distal end pipe 4 forming an operation unit at the other end of the hose 3. An extension pipe 5 and a suction tool 6 are detachably connected to the tip pipe 4. A centrifugal separation type dust collection unit 8 that communicates with the hose 3 and swirls and collects dust sucked together with air from the suction tool 6 is detachably mounted in a recess 7 formed in front of the cleaner body 2. Have been. An electric blower 9 for generating a suction force, an exhaust filter 10, a circuit control device (not shown), a cord winding device (not shown), and the like are provided behind the main body concave portion 7.
[0024]
Here, the electric blower 9 includes a brushless motor unit 34 and a fan unit 35, as shown in FIG.
[0025]
The brushless motor unit 34 has a casing constituted by a load-side bracket 18 and a non-load-side bracket 19, which are casings, and includes a permanent magnet 36 magnetized to a desired number of poles and a bearing 17 therein. The rotor 12 fixed to the output shaft 13 and the stator 22 having a desired number of phases of windings 37 on a stator core 23 having a plurality of slots opposed to the permanent magnets 36 are built in.
[0026]
Next, the inverter circuit section 33 built in the brushless motor section 34 is composed of a board 38 on which a plurality of electronic components are mounted, and its outer shape is a circle substantially along the inner circumference of the non-load side bracket 18 and has a center. The portion is provided with a donut-shaped hole passing through the output shaft 13. Further, a position detecting element 40 such as a Hall element for detecting a magnetic pole of a sensor magnet 39 fixed to the output shaft 13 of the rotor 12 is also mounted on the substrate 38.
[0027]
The fan unit 35 is disposed on the outer periphery of the impeller 25 fixed to the output shaft 13 of the brushless motor unit 34, and guides the airflow flowing out of the impeller 25 into the brushless motor unit 34 while gradually recovering the pressure. An air guide 26 that forms a ventilation path and a casing 27 that has a suction port 41 that covers the air guide 26 are provided, and are integrally attached to the load-side bracket 18 of the brushless motor unit 34.
[0028]
Further, as shown in FIG. 2, a filter 42 for capturing fine dust is provided in the vicinity of the intake upstream side of the suction port 41 of the electric blower 9.
[0029]
The operation of the above configuration is as follows.
[0030]
First, when power is supplied to the brushless motor unit 34, the rotor 12 starts rotating due to repulsion and attraction between the magnetic field generated by the stator 22 and the magnetic field of the permanent magnet 36 fixed to the rotor 12.
[0031]
Next, while detecting the position of the rotor 12 with the sensor magnet 39 and the position detecting element 40 such as a Hall element, the circuit section 33 switches the direction of the current flowing through the winding 37 of the stator 22 to change the direction of the magnetic field generated. By switching, the rotor 12 is continuously rotated by utilizing the repulsion and the attractive force of the magnetic force.
[0032]
When the rotor 12 of the electric blower 9 rotates at a high speed as described above, the impeller 25 fixed to the output shaft 13 of the rotor 12 rotates at a high speed to generate a suction force. The sucked airflow flows into the impeller 25 from the suction port 41 of the casing 27 and is discharged from the outer periphery thereof. Thereafter, the airflow is guided through the passage in the air guide 26 into the non-load-side bracket 19 while being decelerated and recovered in pressure.
[0033]
At this time, the airflow discharged from the fan unit 35 passes through the heat-generating components mounted on the board 38, so that the airflow can be cooled by a large amount of outside air, and the heat-generating components can be cooled very efficiently. Thus, a small and compact electric blower 9 can be realized.
[0034]
Further, at this time, since the rotor 12 rotates at a high speed, fine dust that cannot be caught by the centrifugal separation dust collecting unit 8 is sucked into the electric blower 9 and enters the bearing 17, so that the rotor 12 rotates at a high speed and thus a slight Although there is a danger that the dust adheres to the ball 31 of the bearing 17 and the transfer surface of the inner ring 29 and the outer ring 30 to shorten the life of the bearing 17, fine dust can be captured by the filter 42 provided in front of the electric blower 9. A highly reliable vacuum cleaner can be realized.
[0035]
(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0036]
The seal portion 32 of the bearing 17 constituting the brushless motor portion 34 is formed of a flexible material so as to be in contact with the inner ring 29 and to slide.
[0037]
The operation of the above configuration is as follows.
[0038]
The relatively large dust sucked together with the air is captured by the centrifugal dust collecting unit 8, but fine dust may be sucked into the brushless motor unit 34. However, since the seal portion 32 is in contact with the inner ring 29 to form a seal portion, dust does not enter the bearing 17. Therefore, the life of the bearing 17 is not reduced, and a highly reliable electric blower can be realized. In particular, the effect is very large in the brushless motor section 34 rotating at high speed.
[0039]
(Example 3)
Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0040]
In the vicinity of the bearing 17, a disk-shaped slinger 43 fixed to the output shaft 13 and simultaneously rotating is provided.
[0041]
The operation of the above configuration is as follows.
[0042]
When fine dust is sucked into the brushless motor part 34, the slinger 43 can prevent dust from entering the bearing 17, and does not shorten the life of the bearing 17, thereby realizing a highly reliable electric blower. You can do it.
[0043]
(Example 4)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0044]
The outer peripheral end 44 of the slinger 43 fixed to the output shaft 13 is provided so as to contact and slide with the non-load-side bracket 19 constituting the brushless motor unit 34.
[0045]
The operation of the above configuration is as follows.
[0046]
When fine dust is sucked into the brushless motor portion 34, the outer peripheral end portion 44 of the slinger 43 and the non-load side bracket 19 are in contact with and sliding, so that dust can be completely prevented from entering the bearing 17, The life of the bearing 17 is not shortened, and a highly reliable electric blower 9 can be realized.
[0047]
(Example 5)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0048]
The outer peripheral end 44 of the slinger 43 fixed to the output shaft 13 is fixed to the non-load side bracket 19 with an adhesive or the like, and the inner diameter 45 of the slinger 43 and the output shaft 13 are provided so as to contact and slide.
[0049]
The operation of the above configuration is as follows.
[0050]
Since the sliding friction force between the inner diameter portion 45 of the slinger 43 and the output shaft 13 is smaller than the sliding friction force between the outer peripheral end portion 44 of the slinger 43 and the non-load side bracket 19, the brushless motor portion 34 due to friction loss is generated. A decrease in efficiency can be suppressed.
[0051]
(Example 6)
Next, a sixth embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0052]
The slinger 43 fixed to the output shaft 13 is made of metal or the like, and a seal member 46 that comes into contact with the outer peripheral end 44 is provided on the non-load side bracket 19.
[0053]
The operation of the above configuration is as follows.
[0054]
Since the slinger 43 is made of metal, the strength is high and the accuracy of the flatness is good, so that the effect of the seal portion between the slinger 43 and the seal member 46 is improved. In addition, the durability of the sliding portion is improved, the sealing portion effect can be maintained for a long time, and the life of the bearing 17 is not shortened, and the highly reliable electric blower 9 can be realized.
[0055]
(Example 7)
Next, a seventh embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0056]
The surface of the circuit section 33 provided in the brushless motor section 34 is coated with a water-resistant potting material 47.
[0057]
The operation of the above configuration is as follows.
[0058]
Even if a conductive liquid such as water is accidentally sucked and enters the brushless motor section 34, the circuit section 33 surface is coated with the potting material 47, so that a failure such as an electrical short can be prevented. .
[0059]
【The invention's effect】
Advantageous Effects of Invention According to the present invention, it is possible to provide a highly reliable electric blower and a vacuum cleaner that prevent a reduction in suction power and prevent intrusion of dust.
[Brief description of the drawings]
FIG. 1 is an overall view of a main body of a vacuum cleaner showing a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the main body of the vacuum cleaner. FIG. 3 is a cross-sectional view of the electric blower. FIG. 5 is a cross-sectional view of an electric blower showing a third embodiment of the present invention. FIG. 6 is a cross-sectional view of an electric blower showing a third embodiment of the present invention. FIG. 7 is a sectional view of an electric blower showing a fifth embodiment of the present invention. FIG. 8 is a sectional view of an electric blower showing a sixth embodiment of the present invention. FIG. 9 is a seventh embodiment of the present invention. FIG. 10 is a cross-sectional view of an electric blower showing an example. FIG. 10 is a cross-sectional view of a conventional electric blower. FIG. 11 is a cross-sectional view of the main body of the vacuum cleaner. FIG. 12 is an overall view of the electric vacuum cleaner.
DESCRIPTION OF SYMBOLS 1 Vacuum cleaner 2 Vacuum cleaner main body 8 Centrifugal separation dust collection part 9 Electric blower 12 Rotor 13 Output shaft 17 Bearing 18 Load side bracket 19 Non-load side bracket 22 Stator 25 Impeller 26 Air guide 29 Inner ring 30 Outer ring 32 Seal part 33 Inverter circuit Unit 34 brushless motor unit 35 fan unit 42 filter 43 slinger

Claims (9)

A brushless motor section having a stator and a freely rotatable rotor; an impeller provided on an output shaft of the rotor; an inverter circuit section for controlling power of the brushless motor section; and a casing covering the impeller and the brushless motor section. And a plurality of bearings for holding the output shaft in the casing, wherein the bearing is constituted by a pair of inner and outer rings and a plurality of balls, and at least one of the bearings has one end formed by the outer ring. An electric blower having a configuration in which a contact-type seal portion is held and the other end is in contact with and slides with the inner ring. The electric blower according to claim 1, wherein a lower surface of the seal portion contacts and slides with the inner ring. A brushless motor section having a stator and a freely rotatable rotor; an impeller provided on an output shaft of the rotor; an inverter circuit section for controlling power of the brushless motor section; and a casing covering the impeller and the brushless motor section. And a plurality of bearings for holding the output shaft in the casing, the bearings comprising a pair of inner and outer rings and a plurality of balls, and preventing intrusion of dust near at least one of the bearings. An electric blower provided with a substantially disk-shaped slinger. The vacuum cleaner according to claim 3, wherein a substantially disk-shaped slinger is provided on the impeller side of the bearing and abuts the casing, and the slinger slides on the casing as the output shaft rotates. The electric blower according to claim 3, wherein a substantially disk-shaped slinger is provided on the impeller side of the bearing and fixed to the casing, and an output shaft rotates in the slinger. The electric blower according to claim 3, wherein a substantially disk-shaped slinger is provided on the impeller side of the bearing and abuts against a seal member fixed to the casing, and the slinger slides on the seal member as the output shaft rotates. The vacuum cleaner according to any one of claims 1 to 6, wherein a surface of the inverter circuit unit is coated with a water-resistant potting material. An electric vacuum cleaner, wherein the electric blower according to any one of claims 1 to 7 is incorporated in a cleaner body and communicates with a suction device for sucking dust. An electric blower having a brushless motor unit that emits suction air, a cleaner main body having a centrifugal dust collecting unit for turning dust and centrifugally separating the dust, and communicating with the electric blower and the centrifugal dust collecting unit to remove dust. An electric vacuum cleaner comprising: a suction device for suctioning; and a filter for capturing dust at an upstream side of the electric blower.

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