JP2003049799A - Motor driven blower and vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To totally correct an imbalance of a rotational part for providing a static vibration effect. SOLUTION: In the motor driven blower 30, a centrifugal fan 61 is installed on a rotary shaft 52 of a motor 43 housed inside a motor case 42, a diffuser 58 is installed in the motor case 42 opposedly to the centrifugal fan 61, and the centrifugal fan 61 and the diffuser 58 are covered with a fan cover 67. The diffuser 58 is installed after the centrifugal fan 61 has been installed to the rotary shaft 52 of the motor 43 and a balance to the centrifugal fan 61 has been corrected.

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 a vacuum cleaner capable of obtaining a static vibration effect by comprehensively correcting imbalance of rotating parts.

[0002]

2. Description of the Related Art Generally, an electric vacuum cleaner has a vacuum cleaner body,
The cleaner body is provided with a pipe part that is detachably connected, and the cleaner body part is provided with a dust collection chamber and an electric blower for making the dust collection chamber a negative pressure. ing.

The electric blower has a structure as shown in FIGS. That is, the motor 3 is housed in a container-shaped motor case 2 having an opening 1 at the upper end surface in the figure. The motor case 2 has a plurality of exhaust ports 4 on the lower side surface.
Are formed. The motor 3 is composed of a rotor 5, a stator 6, a carbon holder 7, etc., and a rotating shaft 12 of the rotor 5 has an upper end portion which is attached to the opening 1 of the motor case 2 by a bolt 1.
3 is supported via a motor frame 14 and a bearing 15 mounted at 3, and the lower end is supported on the lower end surface of the motor case 2 via a bearing 16.

The opening 1 of the motor case 2 is provided with rectifying means such as a return air passage 17 and a diffuser 18. The return air passage 17 and the diffuser 18 are the partition walls 1
It is integrated through 9. The partition wall 19 is fixed to the motor frame 14 with bolts 20.

A centrifugal fan 21 is attached to the rotary shaft 12 of the motor 3 via washers 22, 23 and a nut 24. The centrifugal fan 21 has a substantially disc shape, and has an inlet portion 25 at the center and an outlet portion 26 at the outer periphery. The diffuser 18 is formed so as to surround the outer periphery of the centrifugal fan 21 and face the outlet portion 26.

A fan cover 27 is attached to the opening 1 of the motor case 2 to cover the return air passage 17, the diffuser 18, and the centrifugal fan 21. The fan cover 27 has an intake port 28 at the center.

In such an electric blower, when the motor 3 is driven, the centrifugal fan 21 is rotated via the rotary shaft 12. Due to the rotation of the centrifugal fan 21, air is sucked through the air intake port 28 at the center of the fan cover 27. The air sucked from the intake port 28 of the fan cover 27 is changed in direction from the center to the outer periphery by the centrifugal fan 21,
The diffuser 1 facing the outlet 26 of the centrifugal fan 21
It is guided to the outer peripheral side of the fan cover 27 while being rectified by 8, and is guided toward the center of the fan cover 27 again while being rectified by the return air passage 17. The air guided to the center again by the return air passage 17 passes through the inside of the motor case 2 to cool the motor 3, and then is exhausted from the exhaust port 4 of the motor case 2.

[0008]

However, in such a conventional electric blower, the rotor 5 and the centrifugal fan 21 are not used.
Since the balance correction of rotating parts such as etc. was done individually and the parts after balance correction were assembled, depending on the amount of unbalance remaining in each rotating part and the deviation of the phase angle during assembly, etc. There is a problem that a sufficient vibration damping effect may not always be obtained.

The balance correction of the centrifugal fan 21 is
As shown in FIG. 9, the outer peripheral portion of the centrifugal fan 21 is thinned (thinned portion 29).

Therefore, an object of the present invention is to provide an electric blower and a vacuum cleaner in which the above problems are solved and the static imbalance effect is obtained by comprehensively correcting the imbalance of rotating parts. To do.

[0011]

In order to solve the above-mentioned problems, according to the invention described in claim 1, a centrifugal fan is attached to a rotating shaft of a motor housed in a motor case,
In an electric blower in which a diffuser is attached to the motor case so as to face the centrifugal fan, and the centrifugal fan and the diffuser are covered with a fan cover, the centrifugal fan is attached to a rotary shaft of the motor, and the centrifugal fan is attached to the centrifugal fan. On the other hand, the electric blower is characterized in that the balance is corrected, and the diffuser is attached after the balance of the centrifugal fan is corrected.

According to the first aspect of the present invention thus constructed, the centrifugal fan balance is corrected with the centrifugal fan attached to the rotary shaft of the motor, and then the diffuser is retrofitted to rotate the centrifugal fan. It is possible to comprehensively correct the imbalance of parts and obtain a sufficient vibration damping effect.

According to the second aspect of the present invention, a return air passage is provided between the motor case and the diffuser, and the return air passage is formed separately from the diffuser.
The return air passage is attached to the motor case portion before the balance correction of the centrifugal fan, and the diffuser,
The electric blower according to claim 1, wherein the electric fan is attached to the return air passage after the balance of the centrifugal fan is corrected.

According to the second aspect of the present invention configured as described above, even if the return air passage is provided by attaching the attachment diffuser to the return air passage after the balance of the centrifugal fan is corrected, It is possible to comprehensively correct the imbalance of rotating parts and obtain a sufficient static vibration effect.

According to the invention described in claim 3, claim 1
Alternatively, the electric blower described in 2 is characterized by an electric vacuum cleaner attached to the cleaner main body.

According to the invention of claim 3 having such a structure, it is possible to obtain an electric vacuum cleaner having a sufficient vibration damping effect.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention.

First, the structure will be described. FIG. 1 shows an electric vacuum cleaner 3 equipped with an electric blower 30 according to this embodiment.
1 is shown.

This vacuum cleaner 31 is, for example, in the case of a circulation vacuum cleaner, a cleaner main body 32 and the cleaner main body 3
A bellows-shaped hose 34, one end of which is detachably connected to the second connection port 33, and an extension pipe 36 which is detachably connected to a hand-operated portion 35 provided at the other end of the bellows-shaped hose 34.
The extension pipe 36 is provided with a suction port body 37 that is detachably connected to the distal end portion thereof.

A rotary cleaning body (not shown) is provided in the suction port body 37 and a brush motor (not shown) for rotating the rotary cleaning body.
And are provided. Operation panel 35 of the hand operation unit 35
A is provided with a plurality of switches for setting the power of the electric blower 30 described later, turning off the power, and turning on and off the brush motor. The electric blower 30 may be provided with a motor such as a DC brushless motor (drive unit) (not shown) that is driven by inverter control.

The bellows-shaped hose 34 has a double structure. An inner inner hose (not shown) forms a suction air passage for sucking dust, and an outer outer hose exhausts from the cleaner body 32. An exhaust air passage is formed to guide the generated air to the suction port body 37. Similarly, the extension pipe 36 also has a double structure, and an inner pipe (not shown) forms a suction air passage for sucking dust and is connected to the inner hose. The outer pipe forms an exhaust air passage for guiding the air exhausted from the cleaner body 32 to the suction port body 37 and communicates with the outer hose.

A suction opening (not shown) is formed in the lower surface of the suction port body 37, and a suction chamber (not shown) in which the rotary cleaning body is rotatably provided and the circulated air is discharged to the suction chamber. An outlet (not shown) is provided.
The suction chamber communicates with the inner pipe of the extension pipe 36, and the outlet and the extension pipe 3
It communicates with the outer tube of 6.

Inside the cleaner body 32, a dust collection chamber 38, an electric blower 30 for making the dust collection chamber 38 a negative pressure, and air exhausted from the electric blower 30 is circulated to the outer hose of the bellows-shaped hose 34. The circulating air passage 39 and the like are provided.

The electric blower 30 has a structure as shown in FIGS. That is, the opening 4 is formed on the upper end surface in the figure.
The motor 43 is housed in a motor case 42 having a substantially cylindrical container shape. The motor case 42 has a plurality of exhaust ports 44 formed on the lower side surface. Motor 43
Is composed of a rotor 45, a stator 46, a carbon holder 47, etc., and a rotating shaft 52 of the rotor 45 has a motor frame 54 and a bearing 55 whose upper end is attached to the opening 41 of the motor case 42 with a bolt 53. The case 42 is supported substantially at the axial center position, and the lower end portion is supported on the lower end surface of the motor case 42 via the bearing 56 at the substantially axial center position of the motor case 42.

The opening 41 of the motor case 42 is provided with rectifying means such as a return air passage 57 and a diffuser 58.

A centrifugal fan 61 is attached to the rotary shaft 52 of the motor 43 via washers 62, 63 and a nut 64. The centrifugal fan 61 includes a plurality of centrifugal blades 61A and a disk 6 that sandwiches the centrifugal blades 61A.
1B and 61C. An inlet portion 65 is formed at the center of the disc 61B, and an outlet portion 66 is provided between the outer circumferences of the discs 61B and 61C. The diffuser 58 surrounds the outer periphery of the centrifugal fan 61 and is formed so as to face the outlet 66.

In the opening 41 of the motor case 42, a return air passage 57, a diffuser 58 and a centrifugal fan 61 are provided.
A fan cover 67 that covers and is attached. The fan cover 67 has an intake port 68 at the center.

In this embodiment, as shown in FIGS. 4 and 5, a centrifugal fan 61 is attached to the rotary shaft 52 of the motor 43, the centrifugal fan 61 is subjected to balance correction, and the centrifugal fan 61 is adjusted as shown in FIG.
As shown in FIG. 5, the diffuser 58 is attached after the balance of the centrifugal fan 61 is corrected, and the fan cover 67 can be attached. The centrifugal fan 61
4 and 5, the balance is corrected by cutting the outer peripheral portion of the disk 61B of the centrifugal fan 61 with a cutter 80 to reduce the thickness (thinning portion 6).
9).

At this time, in particular, the return air passage 57 is attached to the motor case 42 before the balance of the centrifugal fan 61 is corrected, and the return air passage 5 is adjusted after the balance of the centrifugal fan 61 is corrected.
The diffuser 58 is attached to the seven.

Therefore, the return air passage 57 and the diffuser 58 are separately constructed.

That is, the return air passage 57 is composed of a substantially disk-shaped partition wall 59 and a plurality of radial spiral rectifying plates 70 attached to the lower surface side of the partition wall 59 in the figure. The diffuser 58 is composed of a substantially ring-shaped plate 71 and a plurality of radial vortex-shaped rectifying plates 72 attached to the upper surface side of the plate 71 in the drawing. Opening 5 of diffuser 58
8A, that is, the opening 58A of the plate 71 is formed larger than the diameter of the centrifugal fan 61, and the centrifugal fan 61 is arranged in this opening 58A. In addition, return wind passage 5
The straightening plate of No. 7 and the straightening plate of the diffuser 58 are reversely wound.

The partition wall 59 can be fixed to the motor frame 54 with bolts 60. Further, as shown in FIG. 7, the diffuser 58 is provided to the partition wall 59 of the return air passage 57.
The plate of can be fitted in concavo-convex. In FIG. 7, the partition wall 5
Although the concave portion 75 is formed on the 9 side and the convex portion 76 is formed on the plate side, the concave portion 75 and the convex portion 76 may be opposite.

Next, the operation of this embodiment will be described.

In the electric blower 30, when the motor 43 is driven, the centrifugal fan 61 is rotated via the rotating shaft 52. Due to the rotation of the centrifugal fan 61, air is taken in through the air intake port 68 at the center of the fan cover 67. The air sucked from the intake port 68 of the fan cover 67 is changed in direction from the center to the outer periphery by the centrifugal fan 61,
The diffuser 5 facing the outlet 66 of the centrifugal fan 61
It is guided to the outer peripheral side of the fan cover 67 while being rectified by 8, and is guided toward the center of the fan cover 67 again while being rectified by the return air passage 57. The air guided to the center again by the return air passage 57 passes through the inside of the motor case 42 to cool the motor 43, and then the motor case 42.
It is exhausted from the exhaust port 44.

When the electric blower 30 is assembled, the return air passage 57 is attached to the motor frame 54 in the motor case 42 accommodating the motor 43, and the centrifugal fan 61 is attached to the rotary shaft 52 of the motor 43. And the motor 4
The balance of the centrifugal fan 61 is corrected in a state where the centrifugal fan 61 is attached to the rotary shaft 52 of No. 3, and after the balance is corrected, the diffuser 58 is attached to the return air passage 57 by uneven fitting or the like, and the fan is attached to the motor case 42. Cover 6
Make sure to attach 7.

As described above, the balance of the centrifugal fan 61 is corrected in the state where the centrifugal fan 61 is attached to the rotary shaft 52 of the motor 43, and then the diffuser 58 is retrofitted, whereby the unbalance of the rotating parts is comprehensively achieved. The electric blower 30 having a sufficient vibration damping effect can be obtained.

In particular, by attaching the diffuser 58 to the return air passage 57 after correcting the balance of the centrifugal fan 61, even if the return air passage 57 is provided, the unbalance of the rotating parts can be comprehensively achieved. The electric blower 30 having a sufficient vibration damping effect can be obtained.

Therefore, it is possible to obtain the electric vacuum cleaner 31 having a sufficient vibration damping effect.

[0040]

As described above, according to the first aspect of the present invention, after the centrifugal fan balance is corrected with the centrifugal fan attached to the rotary shaft of the motor, the diffuser is retrofitted. , It is possible to comprehensively correct the imbalance of rotating parts and obtain a sufficient static vibration effect.

According to the second aspect of the present invention, even if the return air passage is provided by attaching the mounting diffuser to the return air passage after the balance of the centrifugal fan is corrected,
It is possible to comprehensively correct the imbalance of rotating parts and obtain a sufficient static vibration effect.

According to the third aspect of the invention, there is a practically useful effect that an electric vacuum cleaner having a sufficient static vibration effect can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric vacuum cleaner according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the electric blower of FIG.

FIG. 3 is an exploded perspective view of FIG.

FIG. 4 is a side sectional view showing balance correction of a centrifugal fan.

FIG. 5 is a perspective view of FIG.

FIG. 6 is a side sectional view showing a state in which a diffuser is attached after balance adjustment.

FIG. 7 is an enlarged sectional view of a concavo-convex fitting portion between a return air passage and a diffuser.

FIG. 8 is a side sectional view of a conventional example.

FIG. 9 is an exploded perspective view of FIG.

FIG. 10 is a perspective view showing a state in which a centrifugal fan is attached.

[Explanation of symbols]

30 electric blower 31 vacuum cleaner 32 Vacuum cleaner body 42 motor case 43 motor 52 rotation axis 57 Return Airway 58 diffuser 61 Centrifugal fan 67 fan cover

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04D 29/44 F04D 29/44 JL M F term (reference) 3B006 FA02 3H033 AA02 AA13 BB01 BB06 BB20 CC01 CC03 DD01 DD25 DD28 DD29 DD30 EE05 EE06 EE10 3H034 AA02 AA13 BB01 BB06 BB20 CC01 CC03 DD01 DD06 DD10 DD16 DD20 DD22 DD26 DD27 DD30 EE05 EE06 EE10

Claims (3)

[Claims] 1. A centrifugal fan is attached to a rotating shaft of a motor housed in a motor case, a diffuser is attached to the motor case so as to face the centrifugal fan, and the centrifugal fan and the diffuser are fan covers. In the covered electric blower, the centrifugal fan is attached to a rotary shaft of the motor, balance correction is performed on the centrifugal fan, and the diffuser is attached after the balance correction of the centrifugal fan. 2. A return air passage is interposed between the motor case and the diffuser, the return air passage is configured separately from the diffuser, and the return air passage is provided before the balance correction of the centrifugal fan. Attached to the motor case part,
The electric blower according to claim 1, wherein the diffuser is attached to the return air passage after the balance of the centrifugal fan is corrected. 3. An electric vacuum cleaner, wherein the electric blower according to claim 1 or 2 is attached to a cleaner body.