JP2003056491A - Electric blower and electric cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower enabling the ration balance adjustment after an assembly on rotation is completed. SOLUTION: A centrifugal impeller 37 sucking the outside air from a center side and discharging to the outside and having a vertical wall 37e formed integrally with an upper surface peripheral edge part is fixed to a motor shaft 33, the vertical wall 37e is cut out as necessary to perform the rotation balance adjustment, and the outside air discharged from the impeller 37 through an air passage surrounded by a plurality of fin bodies 38b is controllably streamlined by a diffuser 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal impeller which is fixed to a motor shaft and sucks outside air from the center side and discharges the outside air to the outside, and a diffuser for rectifying and controlling the outside air discharged from the impeller. And an electric blower equipped with.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, an electric vacuum cleaner 1 includes a cleaner body 2, a hose body 3 having one end connected to the cleaner body 2, and another end of the hose body 3. The thing provided with the suction inlet body 4 connected is well-known.

The vacuum cleaner body 2 is provided with an electric blower 5 and a dust collecting filter 6 inside, and the negative pressure generated by the drive of the electric blower 5 collects dust and the like passing through the suction port body 4 and the hose body 3. It is stored in the filter 6.
Further, the cleaner body 2 has wheels 7 (rear wheels) for moving to the outside.
Etc. are provided.

The hose body 3 is connected to the hand operation tube 9 and a bellows-shaped hose 10 having a connection portion 8 for connection to the cleaner body 2 fixed at one end and a hand operation tube 9 fixed at the other end. The extension pipe 11 is provided. The extension pipes 11 are provided in a pair in the front and rear direction so that they can be connected to each other, and any extension pipe 11 can be connected to the hand operation pipe 9 and the suction port body 4. . Also,
For convenience of use, only one of the extension pipes 11 may be used.

The suction port body 4 comprises a connection pipe 12 connected to the extension pipe 11 (or directly to the hand operation pipe 9) and a suction port body 13 rotatably connected to the connection pipe 12.

On the other hand, as shown in FIGS. 4 to 6, the electric blower 5 includes a motor case having a cover 14 and a case 15 (not shown in FIGS. 4 and 5) divided in the vertical direction in the drawing, and a motor case. An electric motor shaft 16 located at the center (axial center) of the rotor, a rotor 17 fixed to the electric motor shaft 16,
The stator 18 fixed to the motor case facing the rotor 17 and the case 1 positioned at the lower end of the motor shaft 16
5, a brush unit 19 held by the motor 5, a centrifugal impeller 20 that is fixed to the upper end of the motor shaft 16 and sucks outside air from an opening 14a formed at the center of the upper surface of the cover 14,
A diffuser 21 located outside the impeller 20 and a frame 23 fixed by a screw 22 near the upper opening of the case 15 are provided.

The motor shaft 16 has its lower end rotatably supported by a recess 15b formed in the center of the bottom wall 15a of the case 15 via a spring 24 and a bearing 25, and its upper end supported by a recess 23a of the frame 23. It is rotatably supported via 26.

The impeller 20 has a base shroud 20a.
And a fan shroud 20c having an opening 20b in the center
And the opening 20 located between the shrouds 20a and 20c.
A plurality of fins 20d spirally and radially extend from the b side toward the peripheral portion. Further, the impeller 20 includes washers 27 located above and below the base shroud 20a.
It is fixed to the upper end of the electric motor shaft 16 via a nut 28 and a nut 29, and rotates in conjunction with the rotation of the electric motor shaft 16. As a result, the air sucked from the openings 20b can be fed to the plurality of fins 2
Guide to 0d and guide outward from the center of the shaft.

The diffuser 21 is a disk-shaped main body 21a.
A plurality of arc-shaped fins 21b raised from the surface of the
And a plurality of arc-shaped return fins 21c raised from the back surface of the main body 21a.

The fin 21b and the return fin 21c
Adjacent to each other partially overlap each other in a separated state. In addition, the fins 21b receive the air going outward from the center of the impeller 20 by bringing the tips into contact with the back surface of the cover 14, and the rectifying direction (the vertical direction in the drawing).
It forms an air passage that separates the cross section that intersects with. Further, the return fins 21c adjacent to each other form a return air passage from the outside of the motor case toward the center, and the return air passage rectifies the outside air to cool the rotor 17.

[0011]

In the electric blower 5 described above, when adjusting the rotational balance of the rotating portion composed of the electric motor shaft 16, the rotor 17, and the impeller 20, the state where the cover 14 is removed, That is, after assembling up to the state shown in FIGS. 4 and 5, the rotation balance is rotated to check the entire rotation balance. If the balance is poor, the fan shroud 20c should be checked according to the degree. It is preferable to cut off a part of the peripheral portion (for example, the range E shown by the hatched portion in FIG. 4) to adjust the balance of the entire rotating portion (motor shaft 16, rotor 17, impeller 20).

However, since the fins 21b are located on the peripheral portion of the fan shroud 20c, there is almost no working space for cutting the range E for balance adjustment, and the cutting work is impossible.

Therefore, when adjusting the rotation balance of the rotating portion, the rotation balance check in the subunit state in which the motor shaft 16 and the rotor 17 are assembled and the impeller 20 are performed.
The rotation balance check of a single item is performed separately, and when the rotation balance of the impeller 20 is defective, the balance adjustment is performed by the above cutting.

Therefore, when the rotating part is actually assembled,
For example, even if the balance adjustment is performed separately, there is a problem that a subtle defect occurs in the rotation balance of the whole.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electric blower capable of adjusting the rotational balance in a state in which assembly relating to rotation is performed.

[0016]

In order to achieve the above object, an electric blower according to claim 1 is a centrifugal impeller fixed to an electric motor shaft for sucking outside air from the center side and discharging it toward the outside. In an electric blower including a diffuser for rectifying and controlling the outside air discharged from the impeller by an air passage surrounded by a plurality of fins, a standing wall is integrally provided on the upper peripheral edge of the impeller, and the standing wall is formed. The gist is to adjust the rotational balance of the electric blower by cutting it off as necessary.

According to another aspect of the electric blower of the present invention, a centrifugal impeller fixed to the electric motor shaft to suck the outside air from the center side and discharge the outside air to the outside, and a plurality of the outside air discharged from the impeller. In an electric blower equipped with a diffuser that performs rectification control by an air passage surrounded by fin bodies,
The gist of the invention is that the upper wall of the impeller is integrally provided with a standing wall projecting upward from the upper surface of the fin body of the diffuser, and the standing wall is cut off as necessary to adjust the rotational balance of the electric blower. .

The vacuum cleaner according to claim 3 is the vacuum cleaner according to claim 1.
Alternatively, the gist is to provide the electric blower according to claim 2.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of an electric blower of the present invention will be described with reference to the drawings. In addition, the appearance of the electric blower installed in the cleaner body of the electric vacuum cleaner is
Since it is the same as that shown in FIG. 7, the electric blower 30 will be described below as a single item.

1 to 3, the electric blower 30
Is the vertical direction in the figure (front-back direction in the assembled state of FIG. 7)
The cover 31 and the case 32 divided by
(Not shown in the drawings), a motor shaft 33 located at the center (axis center) of the motor case, and a motor shaft 3
3, a rotor 34 fixed to the motor 3, a stator 35 fixed to the motor case facing the rotor 34, a brush unit 36 held by the case 32 so as to be located at the lower end of the motor shaft 33, and a motor. A centrifugal impeller 37 that is fixed to the upper end of the shaft 33 and sucks outside air through an opening 31a formed in the center of the upper surface of the cover 31, a diffuser 38 located outside the impeller 37, and a screw near the upper opening of the case 32 And a frame 40 fixed at 39.

The motor shaft 33 has its lower end rotatably supported by a recess 32b formed in the center of the bottom wall 32a of the case 32 via a spring 41 and a bearing 42, and its upper end supported by a recess 40a of the frame 40. It is rotatably supported via 43.

The impeller 37 is a base shroud 37a.
And a fan shroud 37c having an opening 37b in the center
And the opening 37 between the shrouds 37a and 37c.
A plurality of fins 37d spirally extending from the side b toward the peripheral portion and a standing wall 37e raised from the entire peripheral portion of the fan shroud 37c are provided. The impeller 37 is fixed to the upper end of the electric motor shaft 33 via washers 44 and 45 located above and below the base shroud 37a and a nut 46, and rotates in conjunction with the rotation of the electric motor shaft 33. As a result, the air sucked from the opening 37b is guided by the plurality of fins 37d and is guided outward from the axial center.

The diffuser 38 includes a disk-shaped main body 38a fixed to a frame 40 with screws 47, and a main body 3
A plurality of arc-shaped fins 3 raised from the surface of 8a
8b and a plurality of arc-shaped return fins 38c raised from the back surface of the main body 38a.

The fin 38b and the return fin 38c
Adjacent to each other partially overlap each other in a separated state. In addition, the fins 38b receive the air going outward from the center of the impeller 37 by abutting the tips on the back surface of the cover 31, and the rectifying direction (vertical direction in the drawing).
It forms an air passage that separates the cross section that intersects with. Further, the return fins 38c are adjacent to each other to form a return air passage from the outside of the motor case toward the center, and the return air passage rectifies the outside air to cool the rotor 34.

On the other hand, in the electric blower 30, the stator 32, the electric motor shaft 33, the rotor 34, the frame 40, the brush unit 36, and the diffuser 38 are fixed to the case 32, and the impeller 37 is fixed to the electric motor shaft 33. To do.

In this state, that is, in the state where the cover 31 shown in FIGS. 1 and 2 is not fixed to the case 32, the entire rotating portion including the motor shaft 33, the rotor 34, and the impeller 37 is rotated to balance the rotation. Check.

When balance adjustment is required from the rotational balance considering the entire rotating portion, the standing wall 37e is cut out by the required position and amount as it is in the assembled state (for example, in FIG. 1). Range C indicated by the shaded area)
To adjust the balance.

Therefore, the rotation balance of the entire rotating portion is checked, and in the case of poor balance, balance adjustment can be easily performed in the assembled state according to the degree, and when the balance adjustment is completed. Cover 3
1 can be fixed to the case 32 to be an assembled product.

[0029]

As described above, in the electric blower according to the present invention, the standing wall is integrally provided on the peripheral edge of the upper surface of the impeller, and the standing wall is cut off as necessary to balance the rotation of the electric blower. By adjusting
It is possible to adjust the rotation balance of the electric blower in a state where the rotation blower is assembled.

Further, in the electric blower according to a second aspect of the present invention, a standing wall projecting above the upper surface of the fin body of the diffuser is integrally provided on the peripheral edge of the upper surface of the impeller, and
By adjusting the rotational balance of the electric blower by cutting the standing wall as necessary, the final assembly can be performed while the rotational balance of the electric blower is good and the assembled state is maintained.

The vacuum cleaner according to claim 3 is the vacuum cleaner according to claim 1.
Alternatively, by providing the electric blower according to claim 2,
An electric vacuum cleaner equipped with an electric blower having a good rotational balance can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electric blower according to an embodiment of the present invention and showing the electric blower before a cover is attached.

FIG. 2 is likewise a vertical sectional view of the electric blower before the cover is assembled.

FIG. 3 is likewise an exploded perspective view of the electric blower.

FIG. 4 is a perspective view of the electric blower according to the related art, in which the electric blower is not attached to the cover.

FIG. 5 is a vertical sectional view of the electric blower before the cover is assembled.

FIG. 6 is likewise an exploded perspective view of the electric blower.

FIG. 7 is an external perspective view of the electric vacuum cleaner.

[Explanation of symbols]

31 ... Electric blower 33 ... Motor shaft 37 ... Impeller 37c ... fan shroud 37e ... Standing wall 38 ... Diffuser

Claims (3)

[Claims] 1. A centrifugal impeller fixed to a motor shaft for sucking outside air from the center side and discharging the outside air, and an air passage surrounded by a plurality of fins for the outside air discharged from the impeller. In an electric blower equipped with a diffuser for rectifying control by means of a diffuser, a standing wall is integrally provided on a peripheral edge of an upper surface of the impeller, and the rotation balance of the electric blower is adjusted by cutting the standing wall as necessary. Electric blower to do. 2. A centrifugal impeller fixed to an electric motor shaft for sucking outside air from the center side and discharging the outside air, and an air passage surrounded by a plurality of fins for the outside air discharged from the impeller. In an electric blower equipped with a diffuser that controls rectification by a diffuser, a standing wall that protrudes above the upper surface of the fin body of the diffuser is integrally provided on the peripheral edge of the upper surface of the impeller, and the standing wall is cut off as necessary. An electric blower characterized by adjusting the rotational balance of the electric blower. 3. An electric vacuum cleaner comprising the electric blower according to claim 1 or 2.