JPH05260698A - Electric blower - Google Patents

Abstract

PURPOSE:To provide an electric blower of high output and high in safety used for a vacuum cleaner, wherein the application of vanish can be done enough for the rotor winding. CONSTITUTION:This blower is equipped with a stator 25, a rotor, a fan 22 which rotates together with the rotor 20, and an air guide 18 which is provided blow the fan 22 and holds the bearing on the load side of the rotor 20, and a bracket 19 on anti-load side which holds the bearing on the anti-load side (anti-fan side) of the rotor 20. The periphery at one end of all the edge 32 is united in a ring shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower, and more particularly to an electric blower used for an electric vacuum cleaner.

[0002]

2. Description of the Related Art In recent years, the high output of suction power of electric vacuum cleaners has become remarkable, and electric vacuum cleaners of the type that perform cleaning more effectively with high suction power have become mainstream.

Conventionally, this type of electric blower generally has a structure as shown in FIGS. The configuration will be described below with reference to the drawings.

As shown in the figure, the motor 1 has an outer contour formed by an air guide 2 and a bracket 3, and a shaft 5 of a rotor 4 rotating toward the air guide 2 is projected, and a fan 6 is fixed thereto. The front of the fan 6 is the casing 7
And a suction port 8 is opened at the center of the casing 7 so as to face the fan 6. Bracket 3 is stator 9
And holding the brush holder 10, the brush holder 1
The carbon brush 11 inside 0 is in contact with the commutator 12 provided on the rotor 4. An exhaust port 13 is opened on the anti-load side of the bracket 3. The core 14 is press-fitted onto the shaft 5 of the rotor 4, the rotor winding 15 is provided, and the wedge 16 is inserted into the outer peripheral portion of the core 14. That is, the fan 6 and the casing 7 are combined with the motor 1 whose outer contour is constituted by the air guide 2 and the bracket 3.

In the above structure, when the motor 1 is operated, the fan 6 rotates at a high speed with the rotation of the rotor 4 to generate a suction force, and the air sucked from the intake port 8 passes through the motor 1 and the rotor 4 After the stator 9 is cooled, it is discharged from the exhaust port 13.

[0006]

In such a conventional electric blower, the suction motor 1 is required to have a high output in accordance with the recent increase in power of the electric vacuum cleaner. Air volume, vacuum pressure, and input are high. A varnish was applied to the rotor 4 to fix the rotor winding 15, but the varnish could not be applied in a large amount because it was only dropped on the surface of the rotor winding 15. If the amount of varnish applied is small, the rotor winding 15 will move easily due to the centrifugal force of the high-speed rotation of the rotor 4.
If the insulating film on the surface of the rotor winding 15 has a pinhole or a scratch at the time of winding, a rare short circuit may occur between the windings and the motor 1 may be burned.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric blower capable of sufficiently applying varnish to a rotor winding, having high output, and having high safety.

[0008]

To achieve the above object, the first technical means of the electric blower of the present invention is a stator.
A rotor and a fan that rotates together with the rotor, an air guide that is provided below the fan and that holds a load-side bearing of the rotor, and an anti-load-side bracket that holds a bearing on the anti-load side (anti-fan side) of the rotor. And the outer periphery of one end of all the wedges of the rotor is integrated in a ring shape.

The second technical means is to provide rings on the outer circumferences of both ends of all wedges.

[0010]

According to the first technical means of this construction, since the outer periphery of one end of all the wedges of the rotor on the commutator side is integrated in a ring shape, the varnish is formed in the space formed between the ring portion and the rotor winding. Therefore, the varnish is sufficiently adhered to the rotor windings, and the varnish is sufficiently impregnated inside the rotor windings, whereby the rotor windings can be firmly fixed to each other with the varnish.

According to the second technical means, since the rings are provided on the outer circumferences of both ends of all the wedges, a sufficiently large amount of varnish can be applied, and the rotor windings can be firmly fixed with varnish. Becomes

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An electric blower according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 3, a motor 17 forms an outer shell from an air guide 18 and a bracket 19 (made of resin), a shaft 21 of a rotor 20 rotating toward the air guide 18 is projected, and a fan 22 is fixed thereto. Has been done.
A casing 23 covers the front of the fan 22, and an intake port 24 is opened in the center of the casing 23 so as to face the fan 22. The bracket 19 holds the stator 25 and the brush holder 26, and the carbon brush 27 in the brush holder 26 is in contact with the commutator 28 provided on the rotor 20. An exhaust port 29 is provided on the anti-load side of the bracket 19.
Is open. The core 30 is press-fitted into the shaft 21 of the rotor 20, the rotor winding 31 is provided, and the wedge 32 is inserted into the outer peripheral portion of the core 30. In the first embodiment, the outer circumferences of the end faces of all the wedges 32 on the commutator 28 side are connected to each other in the entire circumference to form a ring shape (ring portion 33a). Further, in the second embodiment, as shown in FIG. 2, in addition to the first embodiment, a ring 33 is provided on the outer circumference of the end surface of the wedge 32 on the fan 22 side.

In the above structure, when the motor 17 is operated, the fan 22 rotates at a high speed with the rotation of the rotor 20 to generate a suction force, and the air sucked from the intake port 24 passes through the motor 17 and the rotor 20. After the stator 25 is cooled, it is discharged from the exhaust port 29.

In the first embodiment, when the varnish is applied to the rotor winding 31, the outer circumference of the end surface of the wedge 32 on the side of the commutator 28 is connected to form a ring, which is a ring shape.
The varnish accumulates in the space formed between the ring portion 33a and the rotor winding 31, the varnish adheres sufficiently to the rotor winding 31, and the interior of the rotor winding 31 is sufficiently impregnated with varnish. Therefore, the rotor windings 31 are firmly fixed with varnish, the windings do not move by centrifugal force, and the pinholes and scratches on the windings are completely protected by the varnish, which prevents the motor from burning due to a rare short circuit. High output can be achieved.

In the second embodiment, the varnish accumulates in the space formed between the ring 33 and the rotor winding 31 by the rings 33 provided on the outer circumferences of both ends of the wedge 32, and the varnish is sufficiently attached to the rotor winding 31. In addition, the varnish is sufficiently impregnated inside the rotor winding 31. Therefore, the rotor windings 31 are firmly fixed with varnish, the windings do not move by centrifugal force, and the pinholes and scratches on the windings are completely protected by the varnish, which prevents the motor from burning due to a rare short circuit. High output can be achieved.

As described above, according to the electric blower of the second embodiment, since the end faces of all the wedges are connected at the entire circumference to form a ring shape, the varnish can be sufficiently applied and the motor burnout can be prevented. The output can be increased.

[0018]

As is apparent from the above embodiments, the electric blower of the present invention is a fan that rotates with the stator and the rotor and the rotor, an air guide that is provided below the fan, and that holds the load side bearing of the rotor, the rotor. Since the anti-load side bracket that holds the bearing on the anti-load side (anti-fan side) of is installed and the outer periphery of one end of all the wedges of the rotor is integrated in a ring shape, a sufficient amount of varnish can be applied. The motor burnout can be prevented and the electric blower can be easily increased in output.

Further, by providing rings on the outer circumferences of both ends of all the wedges, a sufficiently large amount of varnish can be applied, motor burnout can be prevented, and high output of the electric blower can be facilitated.

Therefore, it is possible to provide an electric blower having high output and high safety.

[Brief description of drawings]

FIG. 1 is a front view showing a cross section of a rotor of an electric blower according to a first embodiment of the present invention, which is cut in half.

FIG. 2 is a front view showing a cross section of a rotor of an electric blower according to a second embodiment of the present invention, which is cut in half.

FIG. 3 is a front view showing a cross section of the electric blower half cut away.

FIG. 4 is a front view showing a cross section of the rotor of the conventional electric blower which is cut in half.

FIG. 5 is a front view showing a cross section of the electric blower half cut away.

[Explanation of symbols]

 17 Motor 18 Air Guide 19 Bracket 20 Rotor 21a Rotor Bearing (Load Side) 21b Rotor Bearing (Counter Load Side) 22 Fan 25 Stator 32 Wedge 33 Ring 33a Ring Part

Claims (2)

[Claims] 1. A stator, a rotor, and a fan that rotates with the rotor, an air guide that is provided below the fan and that holds a load-side bearing of the rotor, and an anti-load side (anti-fan side) of the rotor. And an anti-load side bracket for holding the bearing of 1., and an outer periphery of one end of all the wedges of the rotor is integrated in a ring shape. 2. The electric blower according to claim 1, wherein rings are provided on the outer circumferences of both ends of all the wedges.