JP2001234897A - Electric blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the temperature rise of a coil by increasing the quantity of cooling air flowing on the surface of the coil in an electric blower for cooling a motor with air produced by a fan. SOLUTION: A cooling effect is increased by making suction air led to a motor part 1, convergently flow in a slot cavity part 12 in the field 3 by a seal plate 10 with a shielding part 10b for covering a ventilation flue 11 formed by a field iron core outer peripheral part 3c and a bracket inner peripheral part 6b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In recent years, electric blowers used for electric vacuum cleaners and jacuzzi baths have been demanded to be smaller and lighter while maintaining high output in view of operability and installation area. Needless to say, it is required to be cheaper.

Hereinafter, a conventional configuration will be described with reference to FIGS. 6 (a) and 6 (b).

As shown in FIG. 6, a conventional general electric blower comprises a motor unit 1 comprising a field 3, an armature 4, a first bracket 6 and a second bracket 5, a fan 7 and an air guide 8. And a fan unit 2 including a casing 9.

The bracket 6 is formed by forming an iron plate by press drawing, and has a substantially cylindrical shape because it is easy to obtain dimensional accuracy and hardly causes cracking of the material due to the working.

On the other hand, the field iron core 3a of the field 3 housed in the bracket 6 is formed by laminating arc-shaped electromagnetic steel sheets having a substantially rectangular outer shape and four corners having the same dimensions as the inner periphery of the bracket.
The four arc-shaped portions are pressed against the inner periphery of the bracket and press-fitted to fix and house the bracket. This is to make the material of the electromagnetic steel sheet better and to reduce the weight as compared with the case where the outer shape is substantially the same as the inner peripheral shape of the bracket. The field coil 3b is wound around a slot of the field iron core 3a via a winding frame.

The armature 4 includes an armature core 4b and a commutator 4c press-fitted into an output shaft 4a, and an armature coil wound around the armature core 4b and having an end electrically connected to the commutator 4c. 4d, and is rotatably supported by brackets 5 and 6 via a bearing 4e.

The fan 7 is fixed to the output shaft 4 a of the armature 4, and is covered with a casing 9 press-fitted and held in the bracket 5 together with an air guide 8 arranged on an end face of the bracket 5.

In the above configuration, when the field coil 3b and the armature coil 4d are energized, the current flowing through the armature is commutated by the commutator 4c, and the armature 4 is driven by the electromagnetic force generated between the armature 4 and the field. Rotate with. As a result, the fan 7 fixed to the output shaft 4a also rotates at a high speed.
When the rotating fan 7 rotates at a high speed, the air sucked from the suction hole 9a at the center of the fan case 9
Further, the air flows through the fan 7 and becomes a high-speed airflow.
Through the motor 1. The wind guided to the inside of the motor 1 becomes a cooling wind for cooling the field 3 and the armature 4, and is discharged to the outside of the motor 1 through the air holes 6a of the bracket 6 while cooling the coils 3b and 4d.

[0010]

However, in the above-mentioned conventional structure, the cooling air guided to the motor portion is not only the field gap and the slot gap around which the armature coil is wound, but also the outer periphery of the field core. Therefore, there is a problem that a sufficient cooling effect cannot be obtained and the temperature rise of the motor becomes high as a result of flowing through a plurality of ventilation passages formed by the inner periphery of the bracket.

On the other hand, as a means for reducing the temperature rise of the coil, conventionally, measures such as increasing the wire diameter of the wound coil have been adopted, but conversely, the cross-sectional area of the slot gap becomes small. , The cooling effect by suction air is reduced,
There was a problem that it was difficult to obtain an effect despite the cost increase due to the increase in the amount of copper accompanying the increase in the winding diameter.
In addition, since the temperature rise of the coil is high, the insulating material used for the motor unit must be changed to a material having high heat resistance, which has a problem that the cost of the electric blower increases. .

In addition, since the temperature of the electric blower is high even in a finished product unit such as a vacuum cleaner or a jacuzzi bath using the above-mentioned electric blower, it is necessary to use a material having high heat resistance for the main body resin parts near the electric blower. This will increase costs. In addition, there is also a problem that noise suppression and noise absorbing material must be partially removed as a countermeasure against temperature rise, resulting in a loud noise.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and increases the cooling effect of a coil by intensively flowing suction air guided to the inside of a motor into a slot space by a relatively simple method. It is an object of the present invention to provide an electric blower capable of suppressing a rise in temperature of the electric blower.

[0014]

In order to achieve this object, an electric blower according to the present invention comprises a seal plate inside a motor, which seals a plurality of air passages formed by an outer peripheral portion of a field core and an inner peripheral portion of a bracket. It is characterized by being newly added.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the present invention provides a conventional motor by adding a seal plate for shielding a plurality of air passages formed by the outer peripheral portion of the field core and the inner peripheral portion of the bracket B inside the motor. All the suction air flowing through the ventilation path will also flow through the slot gap inside the field, and the cooling air that cools the coil wound around the slot will increase, reducing the temperature rise of the field and armature coils. It can be suppressed.

[0016]

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. 2 is fan 7
And a fan unit including an air guide 8 and a casing 9 and have the same configuration as that of the conventional example.

Reference numeral 1 denotes a motor unit composed of a field 3, an armature 4, a first bracket 6 and a second bracket 5.

Reference numeral 10 denotes a seal plate having a shielding portion 10a for shielding a plurality of ventilation paths 11 formed by a field core outer peripheral portion 3c and a bracket inner peripheral portion 6b, and a projection 10b sandwiched between the brackets 5 and 6. And it is arranged at the end face of the field 3. The plurality of shielding portions 10 a are configured to be partially inserted into the ventilation passages 11 to shield the plurality of ventilation passages 11.

The operation and assemblability of the electric blower constructed as described above will be described below.

First, as the armature 4 of the motor unit 1 rotates, the fan 7 fixed to the armature 4 rotates at high speed. When the rotating fan 7 rotates at a high speed, the air sucked from the fan case 9 passes through the fan 7 to form a high-speed airflow, and is guided into the motor 1 through the air guide 8. Here, a plurality of ventilation paths 11 formed by the outer peripheral portion 3 c of the field core and the inner peripheral portion 6 b of the first bracket 6 are applied to the shielding portion 10 of the seal plate 10.
Since the air is shielded by a, all the suction air that has conventionally flowed through the ventilation path 11 also flows through the slot gap 12 inside the field 3. Accordingly, the amount of cooling air for cooling the coils 3b and 4d of the field 3 and the armature 4 increases, and the temperatures of the coils 3b and 4d can be reduced.

In order to confirm the specific effects of the seal plate 10, a rated voltage of 120 V / 60 Hz and a rated input of 140
As a result of conducting a test using a 0 W electric blower,
In contrast to the case where 1 was not closed at all, 7 to 10 k when the ventilation path 11 was closed at two places, 15 to 18 k when the ventilation path 11 was closed at 3 places, and 17 to 17 k when the ventilation path 11 was closed at all 4 places. It was confirmed that a temperature rise reduction effect of 20 k was obtained.

Next, the assemblability will be described. The seal plate 10 according to the embodiment of the present invention is configured such that the shielding portion 10 a shields the ventilation path 11 on the end face of the field 3 housed in the first bracket 6 in a process before attaching the second bracket 5. It is arranged at a predetermined position. Here, the seal plate 10 of the present invention has a projection 10 for holding and fixing.
b, when the plurality of protrusions 10 b fasten and fix the second bracket 5 to the first bracket 6 with the mounting screws 12, the second bracket 5 and the first bracket 6 It is sandwiched between and held. This makes it possible to assemble the seal plate 10 easily without requiring steps such as screwing, crimping, press-fitting, etc. for newly holding and fixing the seal plate 10, and also to improve the assemblability.

As described above, according to the present invention, there are provided a shielding portion for covering a plurality of ventilation paths formed by an outer peripheral portion of a field iron core and an inner peripheral portion of a bracket, and a plurality of projections for holding and fixing between a pair of brackets. By newly adding a seal plate composed of a motor inside the motor, all the suction air flowing through the ventilation path will also flow through the slot gap inside the field, cooling the coil wound around the slot. As a result, the amount of cooling air to be increased increases, and the temperature rise of the field / armature coil can be efficiently reduced.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. Figure
3. In FIG. 4, 1 is a motor unit, 2 is a fan unit, 4 is an armature, 5 and 6 are brackets, 7 is a fan, 8 is an air guide, and 9 is a fan case. This is the same as the configuration, and the description is omitted. The difference from the configuration of the first embodiment is that a shielding part 14d for shielding a plurality of ventilation paths 11 formed by an outer peripheral part 14e of the field iron core 14a and an inner peripheral part 6b of the bracket 6 is different from the field iron core 14a. Is integrated with the winding frame 14c which is located at the end of the coil 14b and holds and fixes the field coil 14b.

As described above, the outer peripheral portion 14 of the field iron core 14a is
e and a shielding portion 14d for shielding a plurality of ventilation passages 11 formed by the inner peripheral portion 6b of the bracket 6 and the winding frame 14c, so that the sealing plate 10 which is separately inserted in the first embodiment is removed. Since no parts are required, the same effect can be ensured for the coil temperature reduction effect, the cost can be reduced, and the assemblability can be greatly improved.

(Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to FIG. In FIG.
1 is the motor, 2 is the fan, 3 is the field, 4 is the armature, 5
Is a bracket A, 7 is a fan, 8 is an air guide, and 9 is a fan case. The difference from the configuration of the first embodiment is that
The shape of the inner peripheral portion 15a of the bracket 15 is made closer to the outer peripheral portion 3c of the field 3, and the ventilation path 11 formed by the outer peripheral portion 3c of the field 3 and the inner peripheral portion 14a of the bracket 15 is made as small as possible. Is a point.

As described above, the ventilation passage 11 formed by the outer peripheral portion 3c of the field 3 and the inner peripheral portion 15a of the bracket 15 is made as small as possible, so that in the first embodiment, as in the second embodiment, Since the inserted seal plate is not required, the same effect can be ensured for the coil temperature reduction effect, the cost can be reduced, and the assemblability can be greatly improved.

In the first embodiment, the seal plate 1
Although 0 has a structure in which the plurality of shielding portions 10a are integrated, it may be a seal plate including a plurality of individually independent parts corresponding to a plurality of ventilation paths. Further, in the second embodiment, the shielding unit 13 for shielding the plurality of ventilation paths 11
Although d is integrated on the winding frame 13c arranged on the end face of the field core 13a on the bracket 6 side, it goes without saying that d may be formed on the winding frame on the bracket 6 side.

[0029]

As described above, according to the first aspect of the present invention, the cooling effect of the field coil can be increased by concentrating the wind generated by the fan in the field core slot, so that the temperature rise can be reduced. As a result, the size of the electric motor can be reduced.

According to the second aspect of the present invention, the wind generated by the fan can be concentrated on the slot of the field core without adding any special parts, and the temperature rise of the motor can be reduced. There is an effect that can be.

According to the third aspect of the present invention, by adding a seal plate, the bracket can be formed into a cylindrical shape that is most easily manufactured, so that an electric motor with excellent productivity and low temperature rise can be obtained. There is an effect that can be.

According to the fourth aspect of the present invention, there is an effect that the seal plate can be easily attached by providing a projection on the seal plate in the outer direction and clamping the projection with the bracket.

According to the fifth aspect of the present invention, since the seal plate is formed integrally with the winding frame, the temperature rise of the electric motor can be reduced without adding special parts and without increasing the number of assembling steps. There is an effect that can be.

According to the sixth aspect of the present invention, since there is a margin for increasing the temperature of the motor, the size of the motor can be reduced within the range of the allowable temperature increase, so that a compact and space-saving vacuum cleaner can be realized. Alternatively, there is an effect that a low-noise vacuum cleaner can be realized because there is room for temperature rise, and thus it can be covered with a sufficient soundproof material.

According to the seventh aspect of the present invention, since there is a margin for an increase in the motor temperature, the motor can be downsized within the range of the allowable temperature increase, so that a jacuzzi bus that is small and takes up little space can be realized. Alternatively, since there is room for temperature rise, it can be covered with a sufficient soundproofing material, so that a whirlpool bath with low noise can be realized.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a configuration of an electric blower according to a first embodiment of the present invention.

FIG. 2 is a partial sectional view showing a ventilation path of the electric blower according to the first embodiment of the present invention.

FIG. 3 is an external view showing a seal plate according to the first embodiment of the present invention.

FIG. 4 is a partial sectional view showing a configuration of an electric blower according to a second embodiment of the present invention.

FIG. 5 is an external view showing a configuration of a field assembly in a second embodiment of the present invention.

FIG. 6 is a partial sectional view showing a configuration of an electric blower according to a third embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of a third embodiment of the present invention viewed from a direction perpendicular to an axis.

FIG. 8 is a partial cross-sectional view showing a configuration of an electric blower in a conventional example.

FIG. 9 is a partial cross-sectional view showing a ventilation path of an electric blower in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor part 2 Fan part 3 Field 3c Field core outer peripheral part 4 Armature 5 Second bracket 6 First bracket 6b First bracket inner peripheral part 10 Seal plate 10a Shielding part 10b Projection 11 Air passage

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 9/06 H02K 9/06 C 27/00 27/00 (72) Inventor Shiro Tateishi Kadoma, Osaka 1006 Kadoma Matsushita Electric Industrial Co., Ltd. F-term (reference)

Claims (7)

[Claims] 1. A cylindrical bracket having an opening at one end, and a plurality of slots, wherein at least a part of an outer periphery comprising a plurality of axially extending surfaces is in contact with an inner peripheral surface of the bracket. A field core housed in the field core, a field coil wound around the field core slot via a bobbin, and an output shaft rotatably held in a space surrounded by the inner peripheral surface of the field core. An armature that is housed and rotated at a high speed, a fan that is fixed to the armature output shaft and rotates at a high speed, an air guide that guides wind discharged from the fan into the bracket, and a substantially cup. An electric blower having an intake port on the bottom surface of the shape, and a casing attached to the bracket so as to cover the fan and the air guide, wherein the wind guided in the bracket is applied to the field core slot. Concentration An electric blower, characterized in that a ventilation passage to. 2. The electric blower according to claim 1, wherein the inner peripheral shape of the bracket in the radial cross section is set to be the same size or slightly larger than a portion in contact with the outer peripheral shape of the field core. Wherein the wind guided into the bracket concentrates on the field core slot. 3. A field core having a substantially cylindrical cup-shaped bracket, a plurality of slots, and at least a part of an outer periphery formed of a plurality of surfaces extending in an axial direction and housed so as to be in contact with an inner peripheral surface of the bracket. A field coil wound around the field core slot via a winding frame, and an output shaft housed in a space surrounded by an inner peripheral surface of the field core so that the output shaft is rotatably held. An armature that rotates at a high speed, a fan that is fixed to the armature output shaft and rotates at a high speed, an air guide that guides the wind discharged from the fan into the bracket, and an intake port on the bottom surface having a substantially cup shape. An electric blower comprising a casing attached to the bracket so as to cover the fan and an air guide, wherein the fan blows into a space surrounded by an outer peripheral surface of the field core and an inner peripheral surface of the bracket. An electric blower, characterized in that a seal plate for shielding so as not flow into the winds. 4. A first bracket having a substantially cylindrical cup shape having a first bearing holding portion on a bottom surface, and a second bracket having a second bearing holding portion and attached to an opening of the first bracket.
And a field iron core having a plurality of slots and having at least a portion of an outer periphery formed of a plurality of axially extending surfaces and housed in contact with an inner peripheral surface of the bracket, and a winding frame formed in the field iron core slot. The output shaft is rotatably held by a field coil wound around the shaft and respective bearings held by first and second bearing holding portions in a space surrounded by the inner peripheral surface of the field iron core. An armature that is housed and rotated at a high speed, a fan that is fixed to the armature output shaft and rotates at a high speed, an air guide that guides wind discharged from the fan into the bracket, and a substantially cup. A casing having an air inlet on the bottom surface of the shape, the casing being attached to the bracket so as to cover the fan and the air guide;
An electric blower comprising a seal plate that shields the wind discharged from a fan from flowing into a space surrounded by the field core outer peripheral surface and the bracket inner peripheral surface,
The electric blower according to claim 1, wherein the seal plate has a projection provided in an outer radial direction and held between the first and second brackets. 5. The electric blower according to claim 3, wherein the seal plate is formed integrally with the bobbin. 6. An electric vacuum cleaner using the electric blower according to claim 1. 7. A jacuzzi bus using the electric blower according to claim 1.