JP3810709B2 - Electric blower - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention includes a fan fixed to one end of an output shaft provided in an armature, a commutator provided at the other end of the output shaft, a fan cover covering the fan, and an electric part cover surrounding the electric part. The present invention relates to an electric blower.
[0002]
[Prior art]
Conventionally, an electric blower as shown in FIG. 4 is known. In this figure, 1 is a stator and 2 is an armature having a coil 4. The armature 2 is fixed to an intermediate portion of the output shaft 3, and a commutator 5 for supplying a current to the coil 4 is fixed to one end portion of the output shaft 3. The commutator 5 is in contact with a power supply brush (not shown).
[0003]
A centrifugal fan 9 is fixed to the other end of the output shaft 3. The centrifugal fan 9 is covered with a fan cover 10, and an air inlet 8 is provided at the center thereof.
[0004]
A rectifying plate 11 is provided between the electric motor composed of the stator 1 and the armature 2 and the centrifugal fan 9 so that the air from the centrifugal fan 9 is rectified by this rectifying plate 11 and flows to the electric motor side. It has become.
[0005]
The periphery of the electric part is covered with an electric part cover 16 having a cylindrical cover part 16A, and the electric part cover 16 guides the air from the rectifying plate 11 to the electric part. The motorized part is cooled.
[0006]
[Problems to be solved by the invention]
However, there is no sufficient gap between the stator 1 and the armature 2, and the exhaust air sent into the electric part cover 16 flows along the inner wall surface of the cover part 16A as shown by the arrow in FIG. Therefore, the commutator 5 could not be sufficiently cooled, and the temperature rise of the commutator 5 could not be sufficiently suppressed. Further, the carbon friction powder adhering to the commutator 5 could not be blown off, and there was a risk of short-circuiting by the carbon friction powder.
[0007]
An object of the present invention is to provide an electric blower that can sufficiently cool a commutator and blow off carbon friction powder adhering to the commutator.
[0008]
[Means for Solving the Problems]
An electric blower according to the present invention includes an electric unit including a stator and an armature provided rotatably with respect to the stator, a fan fixed to one end of an output shaft provided in the armature, and an output shaft thereof A commutator for supplying a current to the armature, a fan cover that covers the fan, and a cylindrical electric part cover that surrounds the electric part. The electric part cover is provided by the fan. In the electric blower which guides the exhaust air to the electric part and exhausts it from the opening on the other end side, the electric fan has a hole in the center and faces the inner surface of the electric part cover and in the electric part cover A guide cover having a guide wall for guiding the exhaust air sent to the commutator to the commutator is provided in the motor-operated cover, and the outlet is inserted into the hole. The commutator provided on the other end of the shaft is loosely fitted, the guide exhaust air to the commutator through the hole and wherein the evacuating from the opening.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
1 and 2, 31 is a stator, 32 is an armature having a coil 34, and these constitute an electric part. The stator 31 surrounds the armature 32. The armature 32 is fixed to the output shaft 33, and the output shaft 33 rotates integrally with the stator 31 together with the armature 32.
[0011]
A centrifugal fan 39 is fixed to one end of the output shaft 33, and the centrifugal fan 39 rotates together with the armature 32. The centrifugal fan 39 is covered with a fan cover 40, and an air inlet 41 is provided at the center thereof. The centrifugal fan 39 sucks air from the intake port 41 by its rotation and causes the air to flow in the direction indicated by the solid line.
[0012]
A commutator 35 is fixed to the other end of the output shaft 33. The commutator 35 is in contact with a pair of brushes (not shown). Each brush is provided in a pair of brush holders 37 fixed to a cover member (peripheral wall) 50 </ b> A of the electric unit cover 50 described later. The pair of brush holders 37 are opposed to each other, and a spring 44 is mounted between the end of each brush holder 37 and the brush. The brush is elastically contacted with the commutator 35 by the spring 44.
[0013]
A rectifying plate 54 is provided between the electric unit and the centrifugal fan 39. The rectifying plate 54 rectifies the wind from the centrifugal fan 39 and flows it to the electric unit side.
[0014]
The periphery of the electric part is surrounded by a cylindrical electric part cover 50, and this electric part cover 50 guides the air rectified by the rectifying plate 54 on one end side to the electric part. The motorized part is cooled.
[0015]
A cup-shaped cover (guide cover) 51 as a guide member shown in FIG.
[0016]
The cup-shaped cover 51 is generally composed of two semi-cylindrical members 51B. These semi-cylindrical members 51B and 51B include a bottom wall portion 51C that faces the bottom wall portion (end surface) 50b of the electric portion cover 50, and a peripheral wall portion 51D that is fitted to the peripheral wall 50c of the electric portion cover 50. The wall portions 51C are separated from each other by a predetermined distance and are connected by a connecting portion 51E. The connecting portion 51E has a U-shaped cross section and protrudes above (in FIG. 3) the bottom wall portion 51C. The brush holder 37 is inserted into the gap 51F.
[0017]
Further, the bottom walls 51C and 51C are formed with recesses 52 and 52 at opposite positions. A hole 53 is formed by the recesses 52 and 52, and the commutator 35 is loosely fitted into the hole 53. Is set smaller than the outer diameter of the core of the armature 32.
[0018]
Next, the operation of the electric blower configured as described above will be described.
[0019]
When the fan 39 is rotated by the rotation of the armature 32 and the output shaft 33, air is sucked from the air inlet 41 of the fan cover 40, and the sucked air flows into the electric part cover 50. The air flowing into the electric motor cover 50 cools the electric motor, and then is guided by the bottom wall 51C of the cup-shaped cover 51 and blown toward the commutator 35 as indicated by solid arrows. As a result, the commutator 35 is sufficiently cooled, the carbon friction powder adhering to the commutator 35 can be blown off, and short circuit prevention due to accumulation of the carbon friction powder can be achieved.
[0020]
In addition, since the diameter of the hole 53 is set to be smaller than the outer diameter of the core of the armature 32, there is an effect that the air flowing into the electric part cover 50 can be easily guided toward the commutator 35.
[0021]
【The invention's effect】
As described above, according to the present invention, the commutator can be sufficiently cooled, and the carbon friction powder adhering to the commutator can be blown off.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a structure of an electric blower according to the present invention.
FIG. 2 is a side half sectional view showing the structure of the electric blower according to the present invention.
FIG. 3 is a perspective view showing the structure of a cup-shaped cover according to the present invention.
FIG. 4 is a front sectional view showing the structure of a conventional electric blower.
[Explanation of symbols]
31 Stator 32 Armature 33 Output shaft 35 Commutator 39 Fan 40 Fan cover 50 Electric part cover 51 Cup-shaped cover

Claims (2)

An electric part composed of a stator and an armature provided rotatably with respect to the stator, a fan fixed to one end of an output shaft provided in the armature, and provided at the other end of the output shaft; A commutator for supplying an electric current to the armature, a fan cover that covers the fan, and a cylindrical electric part cover that surrounds the electric part, the electric part cover that supplies exhaust air from the fan to the electric part In the electric blower that guides and exhausts from the opening on the other end side,
A guide cover having a hole in the center and facing the inner surface of the electric part cover and having a guide wall part for guiding exhaust air sent into the electric part cover to the commutator is provided in the electric part cover. Provided,
Freely fit a commutator provided at the other end of the output shaft into the hole,
An electric blower characterized in that exhaust air guided by the commutator is exhausted from the opening through the hole. The electric blower according to claim 1, wherein the diameter of the hole is smaller than the outer diameter of the core of the armature.

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