JP5211989B2 - Electric blower and vacuum cleaner having this electric blower - Google Patents

Description

  The present invention relates to an electric blower used for a vacuum cleaner.

2. Description of the Related Art Conventionally, there is an electric blower in which a control board on which a control unit for controlling the electric blower is mounted is provided on the outer peripheral surface of a frame that forms the outer shell of the motor of the electric blower.
In order to make the electric blower compact, such an electric blower is equipped with a motor control unit so as to fit in a space formed by projecting a fan case and an outer frame. A substrate is provided (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2000-249098 (FIG. 1)

However, in the conventional electric blower, since the stator core around which the coil is wound is disposed so as to surround the outer periphery of the rotor, there is a restriction on the miniaturization of the frame in the direction orthogonal to the rotation shaft.
Therefore, it is difficult to secure a large area for providing the control board, and it is necessary to arrange the positional relationship between the frame and the control board closer to each other. There is a problem of reducing the cooling effect.
In addition, when such an electric blower is mounted on a vacuum cleaner, there is a demand for downsizing in a direction orthogonal to the rotation axis of the motor in order to configure the vacuum cleaner at a lower height.

  The present invention has been made to solve the above-described problems, and can reduce the size of the motor, secure a wider area for arranging the control board and the like, and can be easily mounted on a vacuum cleaner. An object is to provide a blower.

Electric blower of the present invention includes a stator having a substantially U-shaped stator core to form a pair of magnetic poles at both ends, a rotor having an output shaft disposed opposite to the previous SL poles, the rotor and the stator a bottomed cylindrical frame for housing, covers the opening of the frame, and a bracket for holding an output shaft of the rotor to the through state, is located outside of the bracket, fixed to the output shaft of the rotor with the air blowing fan, the said stator is held to the outer peripheral surface of the stator core in contact with the cylinder peripheral surface of the frame, the bracket, rotor for cooling the rotor facing the rotor An air inlet and a stator air inlet for cooling the stator facing the stator are formed, and air that has cooled the rotor and the stator is exhausted to the frame. A rotor exhaust port and a stator exhaust port are formed, and the rotor is located between the rotor intake port and the rotor exhaust port, and between the stator intake port and the stator exhaust port. The above-described problem is solved by positioning the stator .

According to the present invention, since a stator having a substantially U-shaped stator core having a pair of magnetic poles formed at both ends is used for the motor, many parts constituting the stator can be arranged at one side of the rotor. .
Thereby, the size of the stator and the frame in the direction perpendicular to the output shaft can be reduced, and the motor of the electric blower can be reduced in size.

Embodiment 1
Embodiment 1 of the present invention will be described below with reference to the drawings.
1 is a side view showing an electric blower according to Embodiment 1 of the present invention.
FIG. 2 is a longitudinal sectional view of the electric blower in FIG.
FIG. 3 is a rear view of the electric blower in FIG. 1.
4 is an AA cross-sectional view of the electric blower in FIG. 1.
FIG. 5 is a cross-sectional view of the electric blower along B-B in FIG. 1.
FIG. 6 is a perspective view showing a stator of the electric blower in FIG. 1.
1 to 4, the electric blower 100 includes a motor unit 10, a blower fan 32 that rotates by the motor unit 10 and takes in cooling air, and a blower unit 30 that rectifies the cooling air.
The outer shell 11 of the motor unit 10 is constituted by a cylindrical frame 11 having an opening 11a at one end and a bottom 11b at the other end.

An opening 11a of the frame 11 is closed by a bracket 12 formed in a circular shape centering on an output shaft 15 of the motor unit 10 to be described later fixed to a mounting flange 11c of the frame 11 with a screw 12c.
The bracket 12 has a flange 12 a and the outer peripheral end 12 b is bent in the direction opposite to the frame 11.

Next, a rear bearing 13 is provided on the bottom 11 b of the frame 11, and a front bearing 14 is provided on the bracket 12.
An output shaft 15 attached to a rotor 16 to be described later is rotatably supported by the front bearing 14 and the rear bearing 13 in a state where the front end portion 15a protrudes from the front bearing 14 through the bracket 12.

The rotor 16 is configured by winding a coil 16c around a slot 16b formed in the iron core 16a. The output shaft 15 is fixedly attached to the center of the iron core 16c constituting the rotor 16.
A commutator 17 is fixedly attached between the rotor 16 of the output shaft 15 and the rear bearing 13. The commutator 17 is electrically connected to the coil 16 c of the rotor 16 and comes into contact with a pair of brushes 18 provided on the frame 11.

  Next, referring to FIGS. 4 to 6, a stator 19 that generates a magnetic force acting on the rotor 16 is formed by stacking a plurality of iron plate members and having a magnetic pole 20 a at both ends, and the stator core 20 is insulated. The coil 20c is wound through a winding frame 20b made of a material.

When the stator core 20 is viewed in plan, the magnetic poles 20a at both ends of the stator core 20 face each other, and the magnetic poles 20a are extended and connected at one place. In other words, the stator core 20 is substantially U-shaped. The coil 20c is wound at a position parallel to the opposing magnetic pole 20a.
Thus, the stator 19 which comprises each part is hold | maintained by contact | abutting the four corners of the outer peripheral surface 20d of a stator core on the inner surface 11f of the flame | frame 11, and the rotor 16 can rotate in the space | gap which a pair of opposing magnetic pole 20a interposed To position.

Next, the rotor exhaust port 11d and the stator exhaust port 11e formed in the frame 11 and the rotor air intake port 12d and the stator air intake port 12e formed in the bracket 12 will be described with reference to FIGS. .
On the inner peripheral surface 11f of the frame 11 positioned in the radial direction of the commutator 17, a rotor exhaust port 11d that mainly exhausts air that has cooled the rotor 16 to the outside of the frame 11 is formed.
Further, the frame 11 positioned in the axial direction of the coil 20 c wound around the stator core 20 is formed with a stator exhaust port 11 e that mainly exhausts air that has cooled the stator 19 to the outside of the frame 11.

  Next, a rotor inlet 12d for mainly passing air for cooling the rotor is formed in a portion of the bracket 12 positioned in the vicinity of the rotor 16 in the axial direction. In addition, a stator inlet 12e for mainly passing air for cooling the stator is formed in a portion of the bracket 12 positioned in the vicinity of the coil 20b wound around the stator 20 in the axial direction.

The openings of the rotor inlet 12d and the stator inlet 12e are formed in a burring shape by bending the periphery of the opening to the frame 11 side, so that a guide wall for guiding cooling air to the rotor 16 or the stator 19 is formed. The relationship between the opening area Sd of the rotor inlet 12d and the opening area Se of the stator inlet 12e is Sd <Se.

Next, the blower unit 30 will be described with reference to FIGS.
The blower unit 30 includes a fan case 31, a blower fan 32, and a fan guide 33.
The fan case 31 has a circular shape that covers a blower fan 32, which will be described later, and is fitted with an intake port 31a formed at the tip and the other end 31b aligned with the outer peripheral end 12b of the circular bracket 12. Yes.

The blower fan 32 is fixed inside the fan case 31 to the tip end portion 15 a of the output shaft 15 that projects the bracket 12 from the inside of the motor 10.
The fan guide 33 is located between the blower fan 32 and the bracket 12, rectifies the airflow from the blower fan 32, and efficiently sends the airflow to the rotor inlet 12d and the stator inlet 12e.

If each part is configured as described above, since the stator 19 having the substantially U-shaped stator core 20 having a pair of magnetic poles formed at both ends is used for the motor part 10, the stator core 20 and the coil wound around the stator core 20 are used. Many parts constituting the stator 19, such as 20 c, can be arranged on one side of the rotor 16.
Thereby, the size of the stator 19 in the direction orthogonal to the output shaft 15 can be reduced, and the size of the frame 11 that holds the outer peripheral surface 20d of the stator core 20 in contact with the inner peripheral surface of the cylinder is also reduced. can do.
Therefore, the motor unit 10 of the electric blower 100 can be reduced in size.

1 to 3, the coil 20 c wound around the rotor 16 and the stator core 20 has a pair of parallel positional relationships, and the frame 11 is brought into contact with the outer peripheral surface 20 d of the stator core 20. Therefore, the output shaft 15 is arranged at a position eccentric from the center 11h of the opening 11a of the frame 11 by a predetermined distance x.
As a result, the motor 10 can be arranged at a position deviated from the center of the fan cover 31 while the output shaft 15 is aligned with the rotation center of the blower fan 32, so that it is formed by projecting the fan cover 31. A space portion K (region indicated by a dotted line in the figure) formed by the region to be formed and the outer frame 11 g of the frame 11 can be secured more widely on one side of the frame 11.

Further, the outer shape of the fan case 31 and the blower fan 32 are both circular, and the other end 31b of the fan case is fitted with the outer peripheral end 12b of the circular bracket 12 in alignment.
Thereby, even if it is the motor part 10 with which the space part K was ensured largely on the one side of the flame | frame 11, it becomes possible to fix the fan case 31 firmly.

Next, the effects of the rotor inlet 11d and stator 11e formed on the bracket 12 and the frame 11, and the rotor exhaust 12d and stator 12e will be described.
When power is applied to the motor unit 10, the rotor 16 rotates and the blower fan 32 also rotates. Thus, outside air is sucked from the air inlet 31 a of the fan cover 31, passes through the blower fan 32, and is rectified by the fan guide 33.
The rectified airflow is diverted to the rotor inlet 12d and the stator inlet 12e as cooling air for cooling the inside of the motor 10, and is guided to the ventilation path A and the ventilation path B formed in the frame 11. .

The cooling air guided to the ventilation path A is exhausted linearly from the stator exhaust port 11e via the stator 19 disposed in the vicinity of the stator intake port 12e in the axial direction.
That is, the air passage A is an air passage that mainly cools the heat generated in the stator 19, and there is only the stator 21 that is resistant to flowing cooling air.

On the other hand, the cooling air guided to the ventilation path B passes through the rotor 16, which is disposed in the vicinity of the rotor inlet 12d in the axial direction, the commutator 17 positioned coaxially, and the brush 18 to the rotor. It is discharged from the exhaust port 11d.
That is, the air passage B is an air passage that mainly cools the armature portion 16, the commutator 17, and the brush 18.

  Thus, since the coil 20b wound around the stator core 20 is disposed only in one region of the rotor 16, the main heat source inside the frame 11 is used as the rotor 16 and the commutator 17 simultaneously with the miniaturization of the motor 10. And the brush 18 source and the stator 20 source.

In other words, a plurality of heat sources can be concentrated in two heat source generation regions in a direction parallel to the rotation axis 15.
In addition to this, there are two main air passages in the frame, the air passage A that cools the stator 19 and the air passage B that cools the rotor, and distributes the amount of cooling air appropriately. By doing so, it becomes possible to cool the inside of the frame efficiently.

That is, the opening area of each intake port 12d, 12e that can be formed due to restrictions such as the strength of the bracket and the relationship with each part is distributed according to the amount of heat generated by each heat source, and the cooling air flowing through each air passage is set to an appropriate amount. The configuration can be set.
Specifically, the opening area of the stator inlet 12e for introducing cooling air into the air passage A that cools the stator 19 that generates more heat than the rotor 16 is formed to be larger than the opening area of the rotor inlet 12d. The cooling air flowing through the air passage A can be increased to cool the members inside the case 11 efficiently.

  Further, in the air passage A, only the stator 21 exists as a resistance against the flow of cooling air, and in the air passage B, the rotor 16, the commutator 17 and the brush 18 are mainly aligned with the rotating shaft 15. In addition, since the cooling target portion coincides with the flow direction of the cooling air, the pressure loss of the cooling air flow pressure can be reduced.

  Furthermore, by forming two types of exhaust ports, a stator exhaust port 11e through which the cooling air that has cooled the stator 20 is mainly discharged and a rotor exhaust port 11d through which the cooling air that has cooled the rotor 16 is mainly discharged. The high-temperature cooling air that has cooled the stator 20 and the cooling air that has cooled the rotor 16 that is relatively lower in temperature than the cooling air can be separately discharged out of the case 11.

  As a result, when the electric blower 100 of the present embodiment is attached to a vacuum cleaner or the like, the components arranged in the vicinity of the exhaust ports 11d and 11e are subjected to heat countermeasures depending on the temperature of the cooling air discharged from the exhaust ports. The type selection can be facilitated.

  As described above, in Embodiment 1, the electric blower 100 in which the fan cover 31 and the fan guide 33 constituting the blower portion 30 are directly attached to the bracket 12 that closes the opening portion 11a of the frame 11 has been described. The units 30 may be configured as independent units, and each unit may be assembled to form one electric blower.

For example, when the motor unit 10 is configured using the bracket 12 having substantially the same shape as the shape of the opening 11 a of the frame 11, the bracket 12 is different from the fan cover 32, so the bracket 12 is used to attach each part of the blower unit 30. Cannot be used.
Therefore, the blower unit 30 is configured by covering the suction fan 32 and the fan guide 33 with a base member instead of the fan cover 31 and the bracket 12.
The base member is formed with openings that communicate with the stator inlet 12e and the rotor inlet 12d formed in the bracket 12.

  Even if the electric blower is configured by attaching the unit of the blower unit 30 configuring each unit to the bracket 12 configuring the unit of the motor unit 10 as described above, the same effect can be obtained.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to the drawings. In addition, the same structure as Embodiment 1 attaches | subjects the same code | symbol, and abbreviate | omits description.
FIG. 7 is a side view showing an electric blower 200 according to the second embodiment.
FIG. 8 is a plan view of FIG. FIG. 9 is a rear view of FIG.

7 to 9, the control board 45 is a circuit board on which various electronic parts including a heat generating part for controlling the rotation speed of the blower fan 32 and the like are mounted, and in a space K formed outside the frame 11. It is attached by the holding member 46 so as to be accommodated.
At this time, a gap for ensuring a predetermined insulation distance is formed between the control board 45 and the outer peripheral surface 11 g of the frame 11. The holding member 46 may be attached to the bracket 12.

And the control board cooling port 12j which is an opening is formed in the flange 12a of the bracket 12, the outside air from the blower fan 32 is directly blown to the control board 45 as the cooling air C, and various electronic components mounted and It is for cooling connectors.
Note that the shape of the control board cooling port 12j is not limited to the opening formed by making a through-hole in the bracket 12, but the end of the flange 12a of the bracket 12 is notched so that the space between the bracket 12 and the fan case 31 is reduced. Alternatively, a gap may be generated.

Since the electric blower 200 configured as described above can utilize the space portion K formed outside the frame 11 and the control board body 45 can be attached to the space portion K and disposed on the frame 11, the sheet metal member It is possible to secure a large insulation distance from the frame 11 formed in (1).
Further, by forming the control board cooling port 12j in the bracket 12, the control board body 45 on which many heat generating components are mounted can be directly cooled by the cooling air from the blower fan 32, so that the cooling efficiency is improved.
Furthermore, even if the powder of the carbon brush 18 made of a conductive material is scattered, the adhesion to the control board body 45 can be prevented by the cooling air from the control board cooling port 12j.

Embodiment 3 FIG.
The third embodiment of the present invention will be described below with reference to the drawings. In addition, the same structure as other embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.
FIG. 10 is a cross-sectional view showing a vacuum cleaner 60 in which the electric blower 100 according to the fourth embodiment is incorporated.

In FIG. 10, the electric blower 100 is attached to the inside of the electric vacuum cleaner 60 via a vibration isolator 61 with the space K facing downward. The reel 62 accommodates the power cord 63 of the electric vacuum cleaner 60 and is located in the space K.
The cord reel cooling port 12k is an opening formed in the bracket 12, and blows the outside air from the blower fan 32 directly onto the cord reel 62 to cool the power cord in the cord reel.

In the electric vacuum cleaner 60 configured as described above, the electric blower 100 in which the space portion K is formed outside the frame 11 is used, and the cord reel 62 is disposed in the space portion K. Can be kept low.
Further, by providing the cord reel cooling port 12k in the bracket 12, the cord reel 62 can be directly cooled by the outside air from the blower fan 32, so that the cooling efficiency is improved.

Side view showing electric blower according to Embodiment 1 1 is a longitudinal sectional view of the electric blower in FIG. Rear view of the electric blower in FIG. AA sectional view of the electric blower in FIG. BB sectional view of the electric blower in FIG. The perspective view which shows the stator of the electric blower in FIG. Side view showing electric blower 200 according to Embodiment 2. Plan view of FIG. Rear view of FIG. Sectional drawing which shows the electric vacuum cleaner 60 in which the electric blower 100 in Embodiment 3 was incorporated.

Explanation of symbols

100 Electric blower 10 showing Embodiment 1 Motor unit 11 Frame 11d Rotor exhaust port 11e Stator exhaust port 12 Bracket 15 Output shaft 16 Rotor 19 Stator 20 Stator core 20a Magnetic pole 20c Coil 20d Stator outer periphery 30 Blower unit 31 Fan cover 32 Fan for blower A Ventilation path A
B Ventilation path B

Claims (6)

A stator having a substantially U-shaped stator core formed with a pair of magnetic poles at both ends;
A rotor having an output shaft disposed opposite the magnetic pole;
A bottomed cylindrical frame that houses the rotor and the stator;
A bracket that covers the opening of the frame and holds the output shaft of the rotor in a penetrating state;
A blower fan located outside the bracket and fixed to the output shaft of the rotor;
With
The stator is held by contacting the outer peripheral surface of the stator core to the inner peripheral surface of the cylinder of the frame ,
The bracket forms a rotor inlet for cooling the rotor facing the rotor, and a stator inlet for cooling the stator facing the stator,
The frame is formed with a rotor exhaust port and a stator exhaust port for exhausting air that has cooled the rotor and the stator.
The rotor is located between the rotor intake and the rotor exhaust,
The electric blower characterized in that the stator is positioned between the stator intake port and the stator exhaust port . The bracket is provided with a fan case that covers the blower fan, and a motor control board is formed in a space formed by an area formed by projecting the fan case in the axial direction and the outer frame of the frame. The electric blower according to claim 1, wherein:   The electric blower according to claim 1 or 2, wherein the bracket is formed in a circular shape centered on the output shaft.   The electric blower according to claim 2 or 3, wherein an opening is formed in the bracket, and the control board is disposed at a position facing the opening. The electric blower according to any one of claims 1 to 4, wherein the stator inlet has an opening area larger than that of the rotor inlet. The vacuum cleaner which has an electric blower in any one of Claims 1 thru | or 5 .

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