JPH08200294A - Electric motor-driven blower - Google Patents

Abstract

PURPOSE: To facilitate mounting a fan cover by positioning the fan cover by bringing its stepped part into contact with a diffuser stepped part and a motor frame point end, further by bringing this fan cover into contact with both the diffuser stepped part and the motor frame point end. CONSTITUTION: Since a large diametric part 14 is formed in an opening end side in a fan cover 12 to form a small diametric part in a fan side in a diffuser 9, the fan cover 12 is formed so that it can be easily inserted. In the case of inserting this fan cover 12, its large diametric part 14 is fitted to an extension part 8 of a motor frame 6 to fit a small diametric part 15 of the fan cover 12 to the small diametric part of the diffuser 9. In a condition that the fan cover 12 is completely press fitted, a stepped part 13 of the fan cover 12 is brought into contact with a stepped part 10 of the diffuser 9 to bring an extension part 13 of the motor frame 6 into contact with the stepped part 10 of the diffuser 9 and a point end of the extension part 8 of the motor frame 6, to accurately perform positioning.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, an electric blower of this type has a bracket 21 for accommodating a stator core and a rotor.
And a motor frame fixed to the opening end side of the bracket 21.
And a diffuser 23 made of synthetic resin fixed to the motor frame 22, and a fan cover 24 covering a fan fixed to the diffuser 23 and the shaft of the rotor. . The outer peripheral edge of the motor frame 22 is bent toward the bracket 21, and the opening edge of the fan cover 24 is press-fitted into the bent portion 25 to fix the fan cover 24 to the motor frame 22.

In the electric blower, it is important to make the gap between the fan cover 24 and the fan constant in order to reduce the variation in the efficiency between the products. For positioning, the outer diameter of the motor frame 22 needs to be large, and the opening edge of the fan cover 24 is curled toward the outer peripheral side for the purpose of improving the workability of press-fitting the fan cover 24. Therefore, there is a drawback that the outer dimensions are further increased.

Therefore, as shown in FIG. 5, the diffuser
23 A step portion 26 is formed on the outer circumference, and a fan cover 24 is formed on the step portion 26.
A configuration is conceivable in which the stepped portion 27 formed in 1 is brought into contact with and positioned. However, since the diffuser 23 is made of synthetic resin, dimensional errors are likely to occur due to forming conditions and the like, and there is a drawback that the fan cover 24 cannot be reliably maintained at a fixed position.

Further, as shown in FIG. 6, a motor frame is used.
It is conceivable that the periphery of the fan 22 is bent toward the diffuser 23, and the step 29 of the fan cover 24 is brought into contact with the bent portion 28 for positioning. However, in recent years, the thickness of the motor frame 22 is becoming thinner due to the reduction in size and weight of the motor, and the thickness of the motor frame 22 alone is enough to cover the fan cover.
It is difficult to position 24.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and achieves miniaturization and a fan cover.
It is an object of the present invention to provide an electric blower that can reliably position a fan.

[0007]

The first means of the present invention is to:
A motor frame, a diffuser fixed to one end side of the motor frame, a fan fixed to a shaft of a rotor extending through the diffuser, and the diffuser. −
And a fan cover for covering the fan, the outer periphery of the diffuser is formed with a small diameter on the fan side and a large diameter on the motor frame side via a step portion, and the motor frame is formed.
The outer peripheral edge of the fan extends substantially axially toward the fan cover side, and the fan cover has a large diameter on the open end side through a step portion, and the step portion of the fan cover is formed into The fan cover is positioned by being brought into contact with the step portion and the end portion of the motor frame.

A second means of the present invention is a motor frame and a diffuser fixed to one end side of the motor frame.
The fan, a fan fixed to the shaft of a rotor extending through the diffuser, and a fan cover covering the diffuser and the fan, and the outer periphery of the diffuser,
The fan side is formed to have a small diameter and the motor frame side is formed to have a large diameter through the step portion, and the outer peripheral edge of the motor frame is bent in a substantially axial direction toward the fan cover side. An end portion of the fan cover is extended substantially in the axial direction, the fan cover is formed with a large diameter on the open end side through a step portion, and the step portion of the fan cover and the step portion of the diffuser are formed. It is characterized in that the fan cover is positioned by making contact with the tip of the extended portion of the motor frame.

[0009]

According to the structure of the first aspect, the fan cover is positioned by the step portion of the fan cover contacting the step portion of the diffuser and the tip of the motor frame. The fan cover is
Since it contacts both the step part of the diffuser and the motor frame tip, the fan cover can be positioned more easily even if there is a dimensional error in the diffuser or the motor frame material is thin. Definitely done.

According to the second aspect of the present invention, the fan cover is provided.
The fan cover step is the diffuser step and the
It is positioned by contacting the tip of the extended portion of the tough frame. The fan cover comes into contact with both the stepped portion of the diffuser and the tip of the extended portion of the motor frame, so if there is a dimensional error in the diffuser or if the material thickness of the motor frame is reduced. However, the fan cover is positioned more reliably.
Further, since the motor frame is formed with an appropriate number of extension portions, it is sufficient to manage the dimensions of only the extension portions, and the dimensional accuracy is better than the configuration in which the entire circumference of the motor frame is brought into contact with the fan cover. Improved and the fan cover is positioned more reliably.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS.

Reference numeral 1 denotes a bottomed cylindrical bracket for fixing the stator core 2 and rotatably supporting a shaft 5 of a rotor 4 via a bearing 3 on the bottom surface. 6 is the bracket 1
The motor frame is fixed to the open end side of the rotor, and the shaft 5 of the rotor 4 is rotatably supported at a substantially central portion through a bearing 7. The peripheral edge of the motor frame 6 is bent in the axial direction toward the diffuser 9 side, which will be described later, and an appropriate number of locations are further extended to form an extended portion 8.

Numeral 9 is a diffuser fixed to the motor frame 6 by forming a step portion 10 on the outer periphery and forming the motor frame 6 side to have a large diameter. The fan 11 side described later is formed to have a small diameter while being fitted to the peripheral edge.
Reference numeral 11 is a fan fixed to the shaft 5 extending through the diffuser 9.

Reference numeral 12 denotes a fan cover that covers the diffuser 9 and the fan 11, and has a large diameter portion 14 on the opening end side through a step portion 13.
The small diameter portion 14 is fitted in the small diameter portion of the diffuser 9, the large diameter portion 15 is fitted in the extended portion 8 of the diffuser 9, and the step portion 13 is formed in the diffuser 9. The step portion 10 of the zipper 9 and the tip of the extended portion 8 of the motor frame 6 are brought into contact with each other and positioned.

Explaining the assembled state in the above structure, the fan cover 12 has a large diameter portion 14 on the opening end side, and the diffuser 9 has a small diameter portion on the fan 11 side. The fan cover 12 can be easily inserted.

When the fan cover 12 is further inserted,
The large diameter portion 14 of the fan cover 12 is fitted into the extended portion 8 of the motor frame 6, and the small diameter portion 15 of the fan cover 12 is fitted into the small diameter portion of the diffuser 9. When the fan cover 12 is completely press-fitted, the stepped portion 13 of the fan cover 12 contacts the stepped portion 10 of the diffuser 9 and the tip of the extending portion 8 of the motor frame 6 to be positioned. Since it contacts both the stepped portion 10 of the diffuser 9 and the tip of the extended portion 8 of the motor frame 6, a dimension error occurs in the diffuser 9 or the material thickness of the motor frame 6 is reduced. Even in this case, the fan cover 12 can be more reliably positioned at a fixed position.

Further, the motor frame 6 is formed with the extended portion 8 and the tip of the extended portion 8 is brought into contact with the step portion 13 of the fan cover 12 to position the fan cover 12, so that the extended portion 8 is positioned. It is only necessary to manage the dimensions of 8, and the dimensional accuracy can be further improved, and the fan cover 12 can be positioned more reliably as compared with a configuration in which the entire circumference of the end edge of the motor frame 6 is in contact with the fan cover 12. be able to.

[0018]

As described above, according to the constitution of claim 1 of the present invention, there is an effect that the fan cover can be surely positioned without increasing the outer shape of the electric blower.

According to the second aspect of the present invention, the fan cover can be positioned more reliably without increasing the outer shape of the electric blower.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a sectional view of the fan cover and a motor frame.

FIG. 3 is a side view showing a cross section of the same portion.

FIG. 4 is an enlarged sectional view of an essential part showing a conventional example.

FIG. 5 is an enlarged sectional view of an essential part showing another conventional example.

FIG. 6 is an enlarged sectional view of a main part showing still another conventional example.

[Explanation of symbols]

 6 Motor frame 8 Extension part 9 Diffuser 10 Step part 11 Fan 12 Fan cover 13 Step part 14 Large diameter part 15 Small diameter part

Claims (2)

[Claims] 1. A motor frame, a diffuser fixed to one end of the motor frame, and a rotor shaft extending through the diffuser. With fans,
The diffuser and a fan cover for covering the fan are formed, and the outer periphery of the diffuser is formed with a small diameter on the fan side and a large diameter on the motor frame side via a step portion, -The outer periphery of the tough frame is extended substantially in the axial direction toward the fan cover side, and the fan cover has a large diameter at the open end side through a step portion, and the step portion of the fan cover is formed into a diffuser. An electric blower characterized in that the fan cover is positioned by contacting the step portion of the zipper and the end portion of the motor frame. 2. A motor frame, a diffuser fixed to one end side of the motor frame, and a rotor shaft extending through the diffuser. With fans,
The diffuser and a fan cover for covering the fan are formed, and the outer periphery of the diffuser is formed with a small diameter on the fan side and a large diameter on the motor frame side via a step portion, -The outer peripheral edge of the tough frame is bent in the substantially axial direction toward the fan cover side, and the end edges thereof are extended in the substantially axial direction at a suitable number of places, and the fan cover is open end side via a step portion. Is formed to have a large diameter, and the fan cover is positioned by bringing the stepped portion of the fan cover into contact with the stepped portion of the diffuser and the leading end of the extended portion of the motor frame.