JP2002364589A - Motor-driven blower and vacuum cleaner equipped therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven blower and a vacuum cleaner equipped therewith capable of removing one of the causes to worsen the rotation balance and also decreasing the number of component items. SOLUTION: The rotary shaft 8 of an armature 6 is held rotatably by a supporting frame 4 through bearings 9, and the base plate 14 of a centrifugal fan body 12, a washer 18 and spacer 17 are fastened to the inner race of the bearing 9 by screwing a nut 21 through a sleeve 20 fast to the threaded shaft 8a of the rotary shaft 8, and the washer 18 is interposed between the spacer 17 and base plate 14, and the sleeve 20 is interposed between the nut 21 and base plate 14 and is furnished with an engaging recess 20b for restriction of rotation, and the base plate 14 is furnished with an engaging projection 14b for restriction of rotation to be fitted in the recess 20b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower in which a centrifugal fan main body is attached to a rotating shaft of a drive motor, and a vacuum cleaner having the same.

[0002]

2. Description of the Related Art As an electric blower of this type, there is one having a drive motor 1 and a centrifugal fan 2 driven by the drive motor 1, as shown in FIG.

In FIG. 32, a drive motor 1 includes a bottomed cylindrical motor frame (motor case) 3, a support frame 4 attached to the open end of the motor frame 3, and a stator 5 fixed within the motor frame 3. And an armature 6 rotatably arranged in an armature arrangement hole 5a of the stator 5. A cylindrical portion 3b is formed at the center of the bottom portion 3a of the motor frame 3, and a cylindrical portion 4b is formed at the center of the support frame 4.
a is formed. The armature 6 includes an armature body 7
And a rotating shaft 8 integral with the armature body 7.

The rotating shaft 8 has a portion near one end rotatably held by the cylindrical portion 4a via a bearing 9 and the other end rotatably held by the cylindrical portion 3b via a bearing 10. ing. The bearing 9 has an inner race 9a, an outer race 9, and a ball 9c interposed between the races 9a and 9b. One end of the rotating shaft 8 projects through the support frame 4, and a small-diameter screw shaft portion 8 a is integrally formed coaxially at one end of the rotating shaft 8.

The centrifugal fan 2 includes a rectifying plate 11 mounted on the support frame 4, a centrifugal fan main body 12 disposed on the rectifying plate 11, 11 and a fan cover 13 that covers the centrifugal fan main body 12. A suction port 13 a is formed in the center of the fan cover 13.

The fan main body 12 has a base plate 14 having a circular flat plate shape, an annular suction side plate 15, and a number of blades 16 interposed between the plates 12a and 12b at a constant pitch in the circumferential direction. A shaft insertion hole 14a shown in FIG. 33 is formed at the center of the base plate 14, and a suction port 15a is formed at the center of the suction plate 15.

The shaft insertion hole 14a of the base plate 14
, One end of the rotating shaft 8 is fitted and inserted. At one end of the rotating shaft 8, an annular spacer 17 whose one end is in contact with the inner race 9 a of the bearing 9, washers 18 and 19 having a diameter larger than the outer diameter of the spacer 17, and a sleeve 20 are fitted in this order. Have been. Moreover, the base plate 14 is interposed between the washers 18 and 19.

A tightening nut 21 is screwed to the screw shaft portion 8a of the rotating shaft 8. This tightening nut 21
Washer 19, base plate 1 via sleeve 20
4, the washer 18, the spacer 17 and the inner race 9a
Is fixed. In this manner, the fan main body 12 is attached to the rotating shaft 8 of the drive motor 1. In addition, the washers 18 and 19 are provided with the tightening nut 21 and the inner race 9.
The holding force of the base plate 14 is increased by preventing the tightening force between the base plate 14a and the base plate 14 from being loosened.

In the electric blower having such a configuration, the rotating parts such as the rotor 6, the spacer 17, the washers 18, 19, the fan body 12, the sleeve 20, and the tightening nut 21 are not balanced in rotation. In such a case, vibration is generated on the rotating shaft 8 during rotation of the rotating component, which causes noise due to the vibration and shortens the service life due to wear of the bearings 9 and 10, which is not preferable.

Therefore, regarding the drive motor, the rotor 6
When the rotor 3 is rotatably held on the frames 3 and 4 via the bearings 9 and 10, vibration measuring devices are attached to several places of the motor frame 3, and the drive motor 1 is operated to rotate the rotor 6 at high speed. Is measured by a vibration measuring device, and the rotational balance of the rotor 6 is confirmed from the measurement result. If the vibration by this measurement is out of the allowable range, the rotation of the rotor 6 is not balanced, so that a part of the rotor 6 is cut off or a balance weight is attached so that the vibration is within the allowable range. The rotational balance of the rotor 6 is adjusted.

The fan body 12 is also mounted on a rotation shaft of a dedicated vibration measuring device, and is driven to rotate. By measuring the vibration of the fan body 12 during rotation, the rotation of the fan body 12 is measured. Check the balance,
The same balance adjustment as that of the rotor 6 is performed.

[0012]

By the way, the spacer 1
7, washers 18, 19, sleeve 20, tightening nut 2
If the processing accuracy is low, the first and the like may cause the rotation balance to deteriorate.

The inner diameter and outer diameter of the spacer 17, the sleeve 20, and the like can be machined with high precision by cutting or grinding to ensure sufficient rotation balance. The washers 18 and 19 are provided with annular projections 18a and 19a extending in the circumferential direction as shown in FIG. The annular forming projections 18a and 19a project in the direction opposite to the base plate 14, and have a semicircular cross section.

Further, since the maximum radius of the tightening nut 21 is sufficiently smaller than that of other parts, it is permissible that the rotational balance of the tightening nut 21 is somewhat poor. However, washer 18,
19 has a very large radius as compared with the spacer 17, the sleeve 20, the tightening nut 21, and the like.
It is not preferable that the imbalance of the rotation of 19 occurs.

However, since the washers 18 and 19 are formed into an inner diameter shape and an outer diameter shape by punching, there is a limit in the processing accuracy of the inner peripheral edge and the outer peripheral edge. In addition, since the annular forming projections 18a and 19a are formed by press working, the annular forming protrusions 18a and 19a after press working are formed.
It is conceivable that the thickness of the annular forming projections 18a, 19a may be varied due to the thickness variation in the circumferential direction of the annular forming projections 19a or the spring-back of the annular forming projections 18a, 19a after press working. There was a limit to the processing accuracy. For these reasons, there is a limit in increasing the processing accuracy of the washers 18 and 19, and it is difficult to improve the rotational balance of the washers 18 and 19.

Therefore, it is desirable to minimize the number of components that cause such a poor rotational balance.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electric blower which can eliminate one of the causes of poor rotational balance and reduce the number of parts, and a vacuum cleaner having the same.

[0018]

In order to achieve this object, an electric blower according to the present invention comprises an armature having a stator, a rotating shaft having a screw shaft integrally provided at one end thereof,
A support frame provided on the stator, a drive motor including a bearing rotatably holding the vicinity of one end of the rotating shaft on the support frame, and an inner part of the bearing fitted to one end of the rotating shaft. An annular spacer abutting on a race, a fastening sleeve fitted to one end of the rotating shaft, and one end of the rotating shaft penetrating through a central portion and disposed between the spacer and the sleeve; A centrifugal fan having a base plate, a washer positioned between the spacer and the sleeve and fitted to one end of the rotary shaft, and a sleeve screwed to the screw shaft portion.
In an electric blower provided with a fastening nut for fastening the base plate, a washer, and a spacer to the inner race, the washer is interposed between the other end surface of the spacer and the base plate, and the sleeve is provided. While being interposed between the tightening nut and the base plate, a locking recess for rotation restriction is formed in one of the base plate and the sleeve, and the other of the base plate and the sleeve is formed in the other of the base plate and the sleeve. It is characterized in that a locking projection for rotation regulation is formed to fit into the locking recess.

According to another aspect of the present invention, there is provided an electric blower comprising: a stator; an armature having a rotating shaft integrally provided with a screw shaft at one end; A support frame provided, a drive motor including a bearing for rotatably holding the vicinity of one end of the rotating shaft to the support frame, and a fitting to one end of the rotating shaft and abutting on an inner race of the bearing. An annular spacer, a fastening sleeve fitted to one end of the rotating shaft, and a base plate having one end of the rotating shaft penetrating through a central portion and disposed between the spacer and the sleeve. A centrifugal fan, a washer positioned between the spacer and the sleeve and fitted to one end of the rotating shaft, and the base plate and the washer screwed to the screw shaft portion with the sleeve. In an electric blower including a fastening nut for fastening a spacer to the inner race, the washer is interposed between the other end surface of the spacer and the base plate, and the sleeve is provided between the fastening nut and the base. While being interposed between the base plate and the base plate, a locking recess for rotation control is formed on the base plate, and a locking protrusion for rotation control fitted to the locking recess is formed on the sleeve. It is characterized by being.

Further, the electric blower according to the third aspect of the present invention is
3. The electric blower according to claim 1, wherein a plurality of the locking recesses and the locking protrusions are formed at a constant pitch in a circumferential direction. 4.

According to a fourth aspect of the present invention, there is provided a vacuum cleaner including the electric blower according to any one of the first to third aspects.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. [Structure] In FIG.
00, a dust collecting bag 101 such as a paper pack filter disposed in a dust collecting chamber (not shown) in the cleaner main body 100, an electric blower 102 for applying a suction negative pressure to the dust collecting chamber, and A dust collection hose 103 connected to the main body 100 and communicating with the dust collection bag 101; an extension pipe 104 connected to the dust collection hose 103; and a suction port 105 connected to the extension pipe 104
Having.

This electric blower 102 has a drive motor 1 and a centrifugal fan 2 driven by the drive motor 1, as shown in FIG.

The drive motor 1 has a bottomed cylindrical motor frame (motor case) 3, a support frame 4 attached to the open end of the motor frame 3, and a stator (stator) fixed inside the motor frame 3. 5 and an armature (rotor) 6 rotatably arranged in an armature arrangement hole 5a of the stator 5. A tubular portion 3b is formed at the center of the bottom 3a of the motor frame 3, and a tubular portion 4a is formed at the center of the support frame 4. Also, the armature 6
An armature body 7 and a rotating shaft (rotor shaft) 8 integrated with the armature body 7 are provided. 3c is the motor frame 3
The exhaust port.

The rotary shaft 8 has a portion near one end rotatably held by the cylindrical portion 4a via a bearing 9, and the other end rotatably held by the cylindrical portion 3b via a bearing 10. ing. The bearing 9 has an inner race 9a, an outer race 9, and a ball 9c interposed between the races 9a and 9b. One end of the rotating shaft 8 projects through the support frame 4, and a small-diameter screw shaft portion 8 a is integrally formed coaxially at one end of the rotating shaft 8.

The centrifugal fan 2 has a rectifying plate 11 attached to the support frame 4, a centrifugal fan main body 12 disposed on the rectifying plate 11, 11 and a fan cover 13 that covers the centrifugal fan main body 12. A suction port 13 a is formed in the center of the fan cover 13.

The fan body 12 has a circular base plate 14 having a flat plate shape, an annular suction side plate 15, and a number of blades 16 interposed between the plates 12a and 12b at equal pitches in the circumferential direction. A shaft insertion hole 14a shown in FIG. 2 is formed at the center of the base plate 14, and a suction port 15a is formed at the center of the suction plate 15.

The shaft insertion hole 14a of the base plate 14
, One end of the rotating shaft 8 is fitted and inserted. At one end of the rotating shaft 8, an annular spacer 17 whose one end is in contact with the inner race 9 a of the bearing 9, a washer 18 having a diameter larger than the outer diameter of the spacer 17, and a sleeve 20.
Are fitted in this order. Moreover, the base plate 14
Is interposed between the washer 18 and the sleeve 20.

At one end of the sleeve 20, an inner flange 20a having an inner diameter smaller than the outer diameter of the rotating shaft 8 is formed. In addition, the other end of the sleeve 20 is provided in FIG.
As shown in FIG. 3 and FIG. 4, a locking recess 2 for rotation regulation that is open to the end face and the inner and outer peripheral faces and extends linearly in the radial direction.
0b is formed.

Further, on the inner peripheral edge of the base plate 14,
As shown in FIGS. 5 (a), 5 (b), 6 and 7, a locking protrusion 14b for rotation regulation is formed which extends linearly in the radial direction. The locking projection 14b is fitted in the locking recess 20b as shown in FIG. 2, fills the entire locking recess 20b, and regulates the relative rotation of the base plate 14 and the sleeve 20 in the circumferential direction. are doing.

A tightening nut 21 is screwed to the screw shaft 8a of the rotary shaft 8. This tightening nut 21
Base plate 14, washer 1 via sleeve 20
8. The spacer 17 is fastened and fixed to the inner race 9a. In this manner, the fan main body 12 is attached to the rotating shaft 8 of the drive motor 1. The washer 18 prevents the tightening force between the tightening nut 21 and the inner race 9a from loosening, and increases the holding force of the base plate 14. [Operation] Next, the operation of the electric blower having such a configuration will be described.

When the armature 6 of the drive motor 1 is driven to rotate, the rotating shaft 8 is driven to rotate integrally with the armature 6, and the centrifugal fan body 12 attached to one end of the rotating shaft 8 is driven to rotate. .

With the rotation of the centrifugal fan main body 12, air outside the fan cover 13 is sucked into the centrifugal fan main body 12 through the suction ports 13a and 15a. The sucked air is discharged to the outer peripheral side of the centrifugal fan main body 12 by the action of the blade 16 of the centrifugal fan main body 12, and then flows into the motor frame 3 through a rectifying passage (not shown) of the rectifying plate 11. . Since a well-known structure can be adopted as the configuration of the current plate 11, its detailed description is omitted.

Then, the air guided into the motor case 3 flows through the motor case 3 and the stator 5 or the armature 6
Is cooled and exhausted to the outside through the exhaust port 3c.

With such rotation, the centrifugal fan body 12
A frictional force due to the tightening force acts between the base plate 14 and the washer 18 to prevent the relative rotation between the base plate 14 and the washer 18. In addition, the washer 18 prevents the sleeve 20, the base plate 14, the washer 18,
Play is prevented from occurring between the spacers 17 and the like. This play prevents the base plate 14 from tilting with respect to the rotation axis 8 and holds the base plate 14 perpendicular to the rotation axis 8.

The locking projection 14b of the base plate 14
Are fitted into the locking recesses 20b of the sleeve 20 to restrict (prevent) the relative rotation between the base plate 14 and the sleeve 20. Therefore, even if the centrifugal fan body 12 rotates, the base plate 14 and the sleeve 20 are There is no relative rotation. Moreover, the locking projections 14b and the locking recesses 20b are very small, and the locking projections 14b are fitted into the locking recesses 20b to fill the entire locking recesses 20b. Therefore, the locking projections 14b and the locking recesses 20b do not cause the rotation balance of the base plate 14 and the sleeve 20 to be impaired.

By using the same metal material for the base plate 14 and the sleeve 20, the base plate 1
The rotation balance of the sleeve 4 and the sleeve 20 can be further prevented from being impaired. [Modification 1] In the embodiment described above, the base plate 14
The relative rotation between the base plate 14 and the sleeve 20 is restricted (prevented) by fitting the locking projection 14b of the base 20 into the locking recess 20b of the sleeve 20. However, the present invention is not necessarily limited to this configuration. Absent. For example, contrary to the above-described configuration, a locking recess is provided in the base plate 14, and a locking projection that fits into the locking recess is provided in the sleeve 20, and the relative rotation between the base plate 14 and the sleeve 20 is performed. Can be regulated.

FIGS. 8 to 14 show this example. In this modified example, as shown in FIGS. 9 and 12 to 14, the shaft insertion hole 1 is formed in the inner peripheral edge of the base plate 14.
Locking notch 3 opening at 4a and extending linearly in the radial direction
0 is formed as a locking recess. Also, sleeve 2
9 has a locking projection 31 extending linearly in the radial direction, as shown in FIGS. 9 to 11. The locking projection 31 is fitted in the locking notch 30 as shown in FIG. 9 to regulate the relative rotation between the base plate 14 and the sleeve 20.

Also in this case, the locking projection 31 and the locking notch 30
Is very small, and the locking projection 31 is fitted into the locking notch 30 to fill the entire locking notch 30, so that the locking projection 31 and the locking Notch 3
Zero does not cause the rotation balance of the base plate 14 or the sleeve 20 to be impaired. Further, by using the same metal material for the base plate 14 and the sleeve 20, it is possible to further prevent the rotational balance of the base plate 14 and the sleeve 20 from being impaired. Parts other than these components are the same as those of the embodiment shown in FIGS. 1 to 7 described above, and therefore, the same reference numerals as those shown in FIGS. . [Modification 2] In the embodiment shown in FIGS. 1 to 7, in order to restrict (prevent) the relative rotation between the base plate 14 and the sleeve 20, the locking projection 14b of the base plate 14 and the sleeve 2 are used.
Although an example in which one locking recess 20b is provided is shown, the number of the locking projection 14b and the locking recess 20b is not necessarily limited to one.

For example, as shown in FIGS.
Four locking recesses 20b are formed on the sleeve 20 at regular intervals of 90 ° and the four locking projections 14b are spaced at regular intervals of 90 ° on the base plate 1 as shown in FIG.
4, the four locking projections 14b of the base plate 14 may be fitted into the four locking recesses 20b of the sleeve 20.

According to this configuration, the four locking projections 14b
And two of the four locking recesses 20b located on opposite sides balance the inertial force generated by the centrifugal force during rotation, so that even if the material of the base plate 14 and the material of the sleeve 20 are different, the locking The protrusion 14b and the locking recess 20b do not cause a disturbance in rotational balance.

In addition, the base plate 14 and the sleeve 20
Can be controlled by the plurality of locking projections 14b and the locking recesses 20b, so that the relative rotation between the base plate 14 and the sleeve 20 can be more reliably restricted. [Modification 3] In the embodiment shown in FIGS. 8 to 14, in order to regulate (prevent) the relative rotation between the base plate 14 and the sleeve 20, the locking notch 30 of the base plate 14 and the sleeve 2
Although an example in which one locking projection 31 is provided is shown, the number of the locking projection 31 and the locking notch 30 is not necessarily limited to one.

For example, as shown in FIGS. 18 and 19,
The four locking projections 31 are formed on the sleeve 20 at regular intervals of 90 °, and the four locking notches 30 are formed on the inner peripheral edge of the base plate 14 at regular intervals of 90 ° as shown in FIG. And the four locking projections 31 of the sleeve 20
May be fitted to the four locking notches 31 of the base plate 14. The illustration of the four notches 30 of the base plate 14 is omitted.

According to this configuration, two of the four locking projections 31 and the four locking notches 30 located on opposite sides balance the inertial force generated by the centrifugal force during rotation. Even if the base plate 14 and the sleeve 20 are made of different materials, the locking projection 31 and the locking notch 30 do not cause a disturbance in rotational balance.

In addition, the base plate 14 and the sleeve 20
The plurality of locking projections 31 and locking notches 3
0, the relative rotation between the base plate 14 and the sleeve 20 can be more reliably regulated. [Modification 4] In the embodiment shown in FIGS. 15 to 17, in order to restrict (prevent) the relative rotation between the base plate 14 and the sleeve 20, the four locking projections 14 b of the base plate 14 and the sleeve 20 Although the example in which the four locking recesses 20b are provided linearly has been shown, the locking projections 14b and the locking recesses 20b are not necessarily required to be linear.

For example, as shown in FIG. 21 (see FIGS. 22 and 23), four hemispherical locking projections 40 are formed on the inner peripheral edge of the base plate 14 at regular intervals at 90 ° intervals in the circumferential direction. At the same time, as shown in FIG. 25 (see FIG. 24), four hemispherical locking recesses 41 are formed on one end surface of the sleeve 20, and the four hemispherical locking projections 4 of the base plate 14 are formed.
0 may be fitted to the four locking recesses 41 of the sleeve 20. [Modification 5] In Modification 4, the base plate 14
The two hemispherical locking projections 40 are formed.
Although two hemispherical locking recesses 41 are provided, the present invention is not necessarily limited to this.

For example, one hemispherical locking projection 40 is formed on the base plate 14 as shown in FIGS. 26 and 27, and the sleeve 20 is formed as shown in FIGS. 26 and 28.
The locking recess 41 of the base plate 14 may be provided so that the locking projection 41 of the base plate 14 is fitted into the locking recess 41 of the sleeve 20. [Modification 6] In Modification 5, a hemispherical locking projection 40 is formed on the base plate 14 and a hemispherical locking recess 41 is provided on the sleeve 20. However, the present invention is not limited to this. Not something.

For example, one hemispherical locking recess 50 is formed in the base plate 14 as shown in FIGS. 29 and 30, and the sleeve 20 is formed as shown in FIGS.
Alternatively, a single locking projection 51 may be provided to fit the hemispheric locking projection 51 of the sleeve 20 into the hemispherical locking recess 50 of the base plate 14.

In the sixth modification, the locking recess 50 is formed as a hemispherical recess. However, the present invention is not limited to this. For example, a locking hole penetrating vertically may be formed in the base plate 14 instead of the locking recess 50, and the through hole may be a locking recess.

[0050]

According to the present invention, there is provided an electric blower having a stator, an armature having a rotating shaft having a screw shaft integrally provided at one end, and an electric fan provided on the stator. A driving motor having a bearing that rotatably holds the vicinity of one end of the rotating shaft to the supporting frame, and an annular shape fitted to one end of the rotating shaft and abutting against an inner race of the bearing. A spacer, a fastening sleeve fitted to one end of the rotating shaft, and a base plate in which one end of the rotating shaft passes through the center and is disposed between the spacer and the sleeve. A centrifugal fan, a washer positioned between the spacer and the sleeve and fitted to one end of the rotating shaft, the screw shaft portion screwed into the base plate with the sleeve,
In an electric blower provided with a fastening nut for fastening a washer and a spacer to the inner race, the washer is interposed between the other end surface of the spacer and the base plate, and the sleeve is provided with the fastening nut. And a base plate, a rotation recessed locking recess is formed in one of the base plate and the sleeve, and the locking recess is formed in the other of the base plate and the sleeve. Since the rotation restricting projections are formed so as to fit into the shaft, one of the causes of the deterioration of the rotation balance can be eliminated and the number of parts can be reduced.

According to a second aspect of the present invention, there is provided an electric blower comprising: a stator; an armature having a rotating shaft integrally provided with a screw shaft at one end; a support frame provided on the stator; A drive motor including a bearing rotatably holding the vicinity of one end of the rotating shaft on the support frame;
An annular spacer fitted to one end of the rotating shaft and abutting against an inner race of the bearing; a tightening sleeve fitted to one end of the rotating shaft; and one end of the rotating shaft centered. A centrifugal fan having a base plate penetrating the portion and disposed between the spacer and the sleeve; a washer positioned between the spacer and the sleeve and fitted to one end of the rotating shaft; The base plate, washer,
In an electric blower including a fastening nut for fastening a spacer to the inner race, the washer is interposed between the other end surface of the spacer and the base plate, and the sleeve is provided between the fastening nut and the base. While being interposed between the base plate and the base plate, a locking recess for rotation control is formed on the base plate, and a locking protrusion for rotation control fitted to the locking recess is formed on the sleeve. With this configuration, it is possible to eliminate one of the causes of the deterioration of the rotational balance and reduce the number of parts.

According to a third aspect of the present invention, there is provided the electric blower according to the first or second aspect, wherein a plurality of the locking recesses and the locking projections are formed at a constant pitch in a circumferential direction. Therefore, the relative rotation between the base plate and the sleeve can be regulated more reliably.

Further, the electric vacuum cleaner according to the fourth aspect of the present invention is configured to have any one of the electric blowers according to the first to third aspects. Has the effect of

[Brief description of the drawings]

FIG. 1A is a schematic perspective view of a vacuum cleaner according to the present invention, and FIG. 1B is a half cross-sectional view of a right half of the electric blower of FIG.

FIG. 2 is an enlarged sectional view of a main part of a portion indicated by a circle A in FIG. 1;

FIG. 3 is a half sectional view of the sleeve shown in FIGS. 1 and 2;

FIG. 4 is a bottom view of FIG. 3;

5A is a partial plan view of the base plate of FIGS. 1 and 2, and FIG. 5B is a partially enlarged view of FIG.

FIG. 6 is a half sectional view of the centrifugal fan main body of FIG. 1;

FIG. 7 is an enlarged view of a main part in a portion indicated by a circle B in FIG. 6;

FIG. 8 shows another example of the electric blower according to the present invention.
FIG.

9 is an enlarged sectional view of a main part of a portion indicated by a circle C in FIG. 8;

FIG. 10 is a half sectional view of the sleeve of FIGS. 8 and 9;

FIG. 11 is a bottom view of FIG. 10;

12A is a partial plan view of the base plate of FIGS. 8 and 9, and FIG. 12B is an enlarged view of a main part of FIG.

FIG. 13 is a half sectional view of the centrifugal fan main body shown in FIG.

FIG. 14 is an enlarged sectional view of a main part of a portion indicated by a circle D in FIG. 13;

FIG. 15 is a half sectional view showing another example of the sleeve of the electric blower according to the present invention.

FIG. 16 is a bottom view of 15;

FIG. 17A is a plan view showing another example of the base plate of the electric blower according to the present invention, and FIG. 17B is a cross-sectional view of the portion of the locking projection shown in FIG.

FIG. 18 is a half sectional view showing still another example of the sleeve of the electric blower according to the present invention.

FIG. 19 is a bottom view of FIG. 18;

FIG. 20 is a plan view showing another example of the base plate of the electric blower according to the present invention.

FIG. 21 is a plan view showing another example of the base plate of the electric blower according to the present invention.

FIG. 22 is a half sectional view of a centrifugal fan main body including the base plate of FIG. 21;

23 is an enlarged cross-sectional view of a main part of a circle E in FIG. 22;

FIG. 24 is a half sectional view showing another example of the sleeve of the electric blower according to the present invention.

FIG. 25 is a bottom view of FIG. 24.

FIG. 26 is a sectional view of a main part showing another example of the sleeve and the base plate of the electric blower according to the present invention.

FIG. 27 is a bottom view of the sleeve shown in FIG. 26.

FIG. 28 is a plan view of the base plate shown in FIG. 26;

FIG. 29 is a fragmentary cross-sectional view showing another example of the sleeve and the base plate of the electric blower according to the present invention.

30 is a bottom view of the sleeve shown in FIG. 29.

FIG. 31 is a plan view of a base plate in FIG. 29;

FIG. 32 is a half sectional view of a conventional electric blower.

FIG. 33 is an enlarged sectional view of a main part of FIG. 32;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drive motor 2 ... Centrifugal fan 4 ... Support frame 5 ... Stator (stator) 6 ... Armature (rotor) 8 ... Rotating shaft 8a ... Screw shaft part 9 ... bearing 9a ... inner race 12 ... centrifugal fan body 14 ... base plate 14b ... locking projection 18 ... washer 20 ... sleeve 20b ... locking recess 21 ・··· Tightening nut 30 ·····································································································・ Locking projection

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (4)

[Claims] 1. An armature having a stator, a rotating shaft integrally provided with a screw shaft at one end, a support frame provided on the stator, and a support frame provided near one end of the rotating shaft. A drive motor having a bearing that rotatably holds the rotating shaft; an annular spacer fitted to one end of the rotating shaft and abutting against an inner race of the bearing; and a tightening fitted to one end of the rotating shaft. A centrifugal fan having a base plate disposed at one end of the rotating shaft penetrating the center and disposed between the spacer and the sleeve; and a centrifugal fan positioned between the spacer and the sleeve. A washer fitted to one end of the rotating shaft, and the sleeve, the base plate, the washer screwed to the screw shaft portion;
An electric blower including a tightening nut for tightening and fixing a spacer to the inner race, wherein the washer is interposed between the other end surface of the spacer and the base plate, and the sleeve is provided between the tightening nut and the base. A locking recess for rotation control is formed in one of the base plate and the sleeve, and is fitted in the locking recess in the other of the base plate and the sleeve. An electric blower, wherein a locking projection for regulating rotation is formed. 2. An armature having a stator, a rotating shaft having a screw shaft integrally provided at one end, a support frame provided on the stator, and a support frame provided near one end of the rotating shaft. A drive motor having a bearing that rotatably holds the rotating shaft; an annular spacer fitted to one end of the rotating shaft and abutting against an inner race of the bearing; and a tightening fitted to one end of the rotating shaft. A centrifugal fan having a base plate disposed at one end of the rotating shaft penetrating the center and disposed between the spacer and the sleeve; and a centrifugal fan positioned between the spacer and the sleeve. A washer fitted to one end of the rotating shaft, and the base plate, washer,
An electric blower including a tightening nut for tightening and fixing a spacer to the inner race, wherein the washer is interposed between the other end surface of the spacer and the base plate, and the sleeve is provided between the tightening nut and the base. While being interposed between the plate and the base plate, a locking recess for rotation control is formed in the base plate,
An electric blower, wherein a locking protrusion for regulating rotation that fits into the locking recess is formed on the sleeve. 3. The electric blower according to claim 1, wherein a plurality of the locking recesses and the locking protrusions are formed at equal pitches in a circumferential direction. 4. An electric vacuum cleaner comprising the electric blower according to claim 1.