JP2000249098A - Motor-driven blower and electric vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease lowering of the cooling effect of an electric vacuum cleaner utilizing exhaust gas while exhaust resistance of a motor-driven blower is decreased. SOLUTION: Exhaust resistance of a draft passage having high exhaust resistance is decreased by a method wherein a bypass exhaust hole is formed in a flange part 451a positioned facing the draft passage of a return guide 415 where a release space in a housing is narrowed by an end bracket plate 452 provided crossing the opening of the housing 451 of an electric motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric blower provided with a centrifugal impeller and a vacuum cleaner using the electric blower.

[0002]

2. Description of the Related Art An electric blower used for a vacuum cleaner is disclosed in Japanese Patent Application Laid-Open No. 10-26099.
A centrifugal impeller rotationally driven by an electric motor, a guide blade for guiding an airflow sucked and discharged by the centrifugal impeller to the electric motor, and a fan cover to which the guide blade is fixed and which covers the centrifugal impeller on a peripheral edge portion And a motor frame fixed to the bracket and having an exhaust port for exhausting airflow from the guide vanes, and a motor frame in which a stator of the electric motor is fixed. Provide multiple exhaust ports on the top,
The airflow from the centrifugal impeller is discharged from the exhaust ports of both the bracket and the motor frame.

[0003] Such an electric blower reduces pressure loss (exhaust resistance) due to turbulent flow when the exhaust flow sucked and discharged by the centrifugal impeller is turned on the fan cover and the inner wall of the outer periphery of the bracket. Efficiency can be improved.

[0004]

In recent years, electric blowers used for electric vacuum cleaners have been increasingly rotated at high speed and miniaturized, and there has been a problem of an increase in exhaust resistance and a rise in temperature due to heat generation of the electric motor.

An object of the present invention is to reduce the reduction of the motor cooling effect using exhaust gas while reducing the exhaust resistance of the electric blower.

Another object of the present invention is to efficiently realize cooling of a heat-generating component by using exhaust gas while reducing exhaust resistance of an electric blower.

[0007]

According to the present invention, there is provided a ventilation system in which an exhaust flow blown to the outer periphery of a centrifugal impeller is passed between a return guide formed on the back side of a rectifying substrate and a flange formed at an opening of a motor housing. In an electric blower, which flows into the housing through a passage, a flange portion facing an air passage of a return guide whose open space into the housing is narrowed by an end bracket plate provided across an opening of the housing of the electric motor. By forming a bypass exhaust hole, the exhaust resistance of a ventilation path having a large exhaust resistance is reduced.

The exhaust from the bypass exhaust hole is guided by an exhaust duct to a brush or a brush holder of the motor, or to a sliding surface between the commutator and the brush, so that the cooling effect of the motor is reduced. .

The present invention also provides a cleaner main body containing a dust collecting filter, an electric blower, and a control device, and a suction port connected to a hand-operated end of a hose connected to the cleaner main body via an extension pipe. In the vacuum cleaner, the electric blower is used.

Further, according to the present invention, a suction body is connected via an extension pipe to a cleaner main body containing a dust collecting filter, an electric blower and a control device, and a hand operating portion at a tip of a hose connected to the cleaner main body. In the electric vacuum cleaner, the electric blower passes the exhaust flow blown to the outer periphery of the centrifugal impeller through a ventilation passage between a return guide formed on the back side of the rectifying substrate and a flange formed at an opening of the motor housing. A bypass exhaust is formed in a flange portion facing the air passage of a return guide, which is configured to flow into the housing and whose opening into the housing is narrowed by an end bracket plate provided across the opening of the housing of the electric motor. A hole is formed, and the control device is cooled using the bypass exhaust gas.

[0011]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an external perspective view of a vacuum cleaner according to the present invention. This vacuum cleaner has an extension pipe 20 in a hand operation unit 202 at the tip of a hose 201 connected to a cleaner main body 100 containing a dust collecting filter, an electric blower, and a control device.
In this configuration, the suction port 204 is connected and used via the power supply 3.
The hand operation unit 202 includes an operation switch 205 for instructing operation control of the electric blower. The instruction input from the operation switch 205 is transmitted to the infrared remote control communication unit or the hose 201.
It is transmitted to the cleaner main body 100 by a wired remote control communication means laid therein, and the cleaner main body 100 executes operation control of the electric blower by a built-in control device according to the received instruction input.

FIG. 2 shows the internal structure of the cleaner body 100. The vacuum cleaner main body 100 forms an outer shell by a lower case 101, an upper case 102, and a dust collection chamber lid 103, and includes a dust collection filter (dust collection bag) 300 and an electric blower 400.
And a control device 500.

Inside the dust collecting chamber cover 103, the dust collecting chamber cover 10 is provided.
3 forms a dust collecting chamber 104 which can be opened and closed freely, and an opening of a dust collecting filter 300
The dust collection filter 300 is installed so as to communicate with the 05,
The dust-containing air from the hose 201 connected to the suction port 105 is taken in. The electric blower 400 sucks and exhausts air in the dust collection chamber 104.

The control device 500 is divided into a control processing unit 501 for performing communication with the operation switch 205 of the hand operation unit 202 and arithmetic processing and a power control unit 502 for generating a large amount of heat. The part 502 is an electric blower 400
It is installed so that it can be forcibly cooled by using the exhaust air.

3 to 5 show an embodiment of the electric blower. FIG. 3 is a vertical sectional side view of the electric blower, and corresponds to a section taken along line III-III of FIG. FIG. 4 is a cross-sectional plan view of the electric blower, and corresponds to a section taken along line IV-IV of FIG. FIG. 5 is a side view of the electric blower.

The electric blower 400 includes a blower section 410
And a motor section 450.

The blower unit 410 includes a centrifugal impeller 411,
The fan includes a fan casing 412 that houses the centrifugal impeller 411 from both sides and a rectifying board 413. The rectifying substrate 413 includes a diffuser 414 that is erected so as to be located in a discharge passage on the outer periphery of the centrifugal impeller 411 on the front side.
Return guide 415 formed to hang down on the back side
Is provided.

The motor section 450 is a series-wound commutator type motor, and has a cup-shaped housing 451 having a flange 451a extending outward at the opening edge, and a bridge extending across the opening to screw on the flange 451a. I to stop
An outer shell is formed by the end bracket plate 452 having the shape. A stator 453 is fitted in the housing 451, and a rotation shaft 454 a of the rotor 454 is attached to the end bracket plate 4.
52 and a bearing 455b attached to the bottom of the housing 451. The end of the rotating shaft 454a on the side of the end bracket plate 452 penetrates the bearing 455a and the end bracket plate 452, and is led out to fit the centrifugal impeller 411.

The rectifying board 413 of the blower unit 410 is screwed to the outside of the end bracket plate 452, and the fan casing 412 is fitted to the outer edge of the flange 451a.

The stator 453 of the motor section 450 is formed by winding a stator winding 453b around a stator core 453a having a rectangular outer periphery, and is fitted in a housing 451. Stator 4
An axial ventilation path is formed between the inner peripheral wall and the stator 453 in the housing 451 in which 53 is fitted. 453c is a connection terminal of the stator winding 453b.

The commutator 454b of the rotor 454 is located on the side opposite to the opening of the housing 451.
The brush 457 supported by the brush holder 456 attached from the outside so as to penetrate through the brush 1 is brought into contact with and slid.
An exhaust port 451 is provided on a peripheral wall of the housing 451 on the opposite side to the opening side so as to be located on both sides of the brush holder 456.
b, 451c are formed.

The flange 451a of the housing 451 has an opening at the center of the return guide 415 facing a ventilation passage obstructed by the end bracket plate 452 and narrowing a flow passage into the housing 451, thereby forming a bypass exhaust hole. 451d and 451e are formed. Then, the power control unit 502 of the control device 500 is installed so as to face the bypass exhaust hole 451d. The power control unit 502 is mounted on the outer peripheral surface of the housing 451, and an exhaust duct 601 is provided between the power control unit 502 and the bypass exhaust hole 451d, so that exhaust gas from the bypass exhaust hole 451d is efficiently guided to the power control unit 502. Thus, the cooling effect of the power control unit 502 is enhanced.

According to such a vacuum cleaner, when the electric blower 400 is operated and the dust collecting chamber 104 is evacuated to a negative pressure, new air flows from the suction port 204 to the extension pipe 203, the hand operation section 202, and the hose. Dust collection filter 3 through 201
00, and the suction air from the suction port 204 at this time carries the dust on the floor surface.

The electric blower 400 radially discharges the air sucked from the center of the centrifugal impeller 411 from the outer periphery.
The exhaust gas radially ejected from the centrifugal impeller 411 passes through a diffuser 414 on the surface side of the rectifying substrate 413 and then reverses through an annular gap between the outer periphery of the rectifying substrate 413 and the fan casing 412 to be inverted. It flows around the back side of 413 and further flows into the housing 451 through the ventilation passage between the blades of the return guide 415. The exhaust gas flowing into the housing 451 is
The rotor 454 and the brush 457 are cooled and the exhaust port 45 is cooled.
1b and 451c are discharged outside the machine.

Exhaust air flowing into the housing 451 from the opening of the housing 451 through the ventilation passage of the return guide 415 flows into the housing 451 avoiding the end bracket plate 452 crossing the opening of the housing 451. Therefore, the ventilation path in which the open space on the center side of the return guide 415 faces the end bracket plate 452 is the ventilation path in this open space.
2, the airflow resistance is reduced.

However, the electric blower 400 of this embodiment has a bypass exhaust hole 451d in the flange portion 45a facing the ventilation passage in which the ventilation passage is narrowed by the end bracket plate 452 and the ventilation resistance is increased. As a result, the exhaust flow of the ventilation path is bypassed and exhausted, so that an increase in ventilation resistance (exhaust resistance) of the ventilation path obstructed by the end bracket plate 452 is reduced, and suction force (blowing efficiency) is increased. By performing the bypass exhaust, the stator 453 and the rotor 45 flow into the housing 451.
Although the amount of air for cooling the brush 4 and the brush 457 decreases, the effect of the decrease in the amount of cooling air is small because this bypass exhaust is performed in the air passage having a large ventilation resistance.

Further, in this embodiment, the bypass exhaust is controlled by the control device 50 by the exhaust duct 601.
Since the power control unit 502 is used to cool the power control unit 502 by forming a part of the power control unit 502, the cooling effect of the power control unit 502 that generates a large amount of heat in the control device 500 can be enhanced. .

In this embodiment, the control device 5
In the case of 00, the control processing unit 501 and the power control unit 502 are configured separately so that the power control unit 502 is forcibly air-cooled. good.

FIG. 6 shows another embodiment of the present invention. In this embodiment, the housing 4 of the electric blower 400 is used.
51, a bypass exhaust hole 4 formed in the flange portion 451a
The configuration is such that the bypass exhaust from 51d is guided by the exhaust duct 602 to be sprayed on the brush 457 (brush holder 456).

When the electric blower 400 rotates at a high speed and is downsized, the amount of heat generated on the sliding surface between the commutator 454b and the brush 457 increases, and a rise in the temperature of the portion becomes a problem.

According to this embodiment, the exhaust resistance can be reduced by the bypass exhaust, the suction force of the electric blower 400 can be increased, and the bypass exhaust can be removed by the brush 4.
The temperature rise of the brush 457 can be reduced by spraying the air onto the brush 57 and forcibly cooling the brush 457.

The outlet of the exhaust duct 602 is connected to the commutator 4
The guide may be guided into the housing 451 so as to face the sliding surface of the brush 457 and the sliding surface of the brush 457, and the bypass exhaust may be blown to the sliding surface.

[0034]

According to the present invention, a bypass exhaust hole is formed in a flange portion facing an air passage of a return guide in which an open space into the housing is narrowed by an end bracket plate provided across the opening of the motor housing. By doing so, the exhaust resistance of the ventilation path having a large exhaust resistance is reduced, so that it is possible to increase the blowing efficiency while reducing the decrease in the cooling effect of the electric motor.

Further, the bypass exhaust from the bypass exhaust hole is used for cooling the brush of the motor or for forced air cooling of the sliding surface between the commutator and the brush, or for forced air cooling of the control device. Thereby, cooling of the heat-generating component can be efficiently realized.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a vacuum cleaner according to the present invention.

FIG. 2 is a vertical sectional side view showing an internal structure of a vacuum cleaner main body of the vacuum cleaner of the present invention.

3 is a vertical sectional side view showing one embodiment of the electric blower of the present invention, and corresponds to a section taken along line III-III of FIG.

4 is a cross-sectional plan view of the electric blower of the present invention, and FIG.
IV-IV section.

FIG. 5 is a side view of the electric blower of the present invention.

FIG. 6 is a side view of an electric blower showing another embodiment of the present invention.

[Explanation of symbols]

400: electric blower, 410: blower unit, 411: centrifugal impeller, 412: fan casing, 413: rectifying board, 414: diffuser, 415: return guide,
450: electric motor unit, 451: housing, 451a: flange unit, 502: power control unit, 601: exhaust duct.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hisanori Toshima 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Prefecture F-term in the Electric Appliances Division, Hitachi, Ltd. 3B006 BA05 BA07 3H034 AA02 AA13 BB02 BB06 BB20 CC03 DD12 DD18 EE03 EE18 3H035 AA02 AA06

Claims (5)

[Claims] An exhaust flow blown to the outer periphery of a centrifugal impeller flows into the housing through a ventilation passage between a return guide formed on the back surface of the rectifying substrate and a flange formed at an opening of a housing of the motor. In the electric blower, a bypass exhaust hole is formed in a flange portion facing an air passage of a return guide in which an open space into the housing is narrowed by an end bracket plate provided across the opening of the housing of the electric motor. An electric blower characterized by the following. 2. The electric blower according to claim 1, further comprising an exhaust duct for guiding exhaust air from the bypass exhaust hole to a brush or a brush holder of the electric motor. 3. An electric blower according to claim 1, further comprising an exhaust duct for guiding exhaust air from said bypass exhaust hole to a blow surface of a commutator and a brush of a motor. 4. A vacuum cleaner body containing a dust collecting filter, an electric blower and a control device, and a vacuum cleaner having a suction port connected to a hand-operated portion at a tip of a hose connected to the vacuum cleaner body via an extension pipe. In Claim 1, The electric blower which used the electric blower as described in any one of Claims 1-3 as the said electric blower. 5. A vacuum cleaner body containing a dust collecting filter, an electric blower and a control device, and a vacuum cleaner having a suction port connected to a hand operating portion at a tip of a hose connected to the vacuum cleaner body via an extension pipe. In the electric blower, the exhaust flow blown to the outer periphery of the centrifugal impeller is introduced into the housing through a ventilation passage between a return guide formed on the back side of the rectifying substrate and a flange formed at an opening of the housing of the motor. A bypass exhaust hole is formed in a flange portion facing an air passage of a return guide whose opening portion into the housing is narrowed by an end bracket plate provided so as to cross an opening of the housing of the electric motor. An electric vacuum cleaner characterized in that the control device is cooled by using exhaust gas from the bypass exhaust hole.