JP2707645B2 - Electric blower - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric blower used for household vacuum cleaners and the like.

2. Description of the Related Art In recent years, output and price competition in a vacuum cleaner and the like have become fierce, and a high-efficiency and inexpensive blower has also been required for an electric blower which is a main component thereof.

Hereinafter, the conventional electric blower described above will be described with reference to the drawings.

2 and 3 are a half sectional view of a conventional electric blower and a detailed view of a fan case.

In FIG. 2, reference numeral 1 denotes a motor that rotates at high speed, 2 denotes a fan that has a plurality of blades and rotates together with the motor 1,
Is an air guide which is arranged in a position parallel to the fan 2 and guides the airflow from the fan 2 into the motor 1.
Is fixed to the bracket 4. Reference numeral 5 denotes a fan case containing the fan 2 and the air guide 3, and has an intake port 5 a opened in the center, and is press-fitted and fixed to the bracket 4 of the motor 1.

With the above configuration, when the motor 1 rotates, the airflow flowing from the intake port 5a of the fan case 5 passes through the fan 2 as shown by the arrow, flows into the motor 1 along the air guide 3, and the inside of the motor 1 Is discharged to the outside of the motor 1 while being cooled.

However, in the above configuration, the motor bracket 4
A small gap 6 exists between the air guide 3 and the air guide 3, the airflow flowing into the motor through the air guide 3 leaks again to the fan side through the small gap 6, and the efficiency is reduced. Had a point.

In addition, in order to eliminate the minute gap 6 and prevent air flow from leaking, the air guide 3 must be press-fitted into the bracket 4 or a sealing agent must be sealed, which makes it difficult to automate the assembly. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and aims to prevent an airflow from leaking and improve efficiency by an easy method.

Means for Solving the Problems In order to solve the above problems, the electric blower of the present invention has a flange portion on an outer peripheral portion, and the flange portion is brought into contact with and in close contact with a bracket end surface and a fan-facing surface of an air guide. It has a fan case press-fitted and fixed to the outer periphery of the bracket.

Action The present invention can prevent the air flow leaking to the fan side through the minute gap between the air guide and the bracket by the above-described configuration, thereby preventing a decrease in vacuum pressure and improving efficiency. Improvement can be achieved. Further, since press-fitting and fixing between the air guide and the bracket, or sealing material, which has been required to prevent air current leakage, is not required, assembly becomes easy and automation can be achieved. .

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a half sectional view of a fan case of an electric blower according to the present invention. The same parts as those in the conventional example are denoted by the same reference numerals.

In FIG. 1, reference numeral 2 denotes a fan which has a plurality of blades and rotates together with the motor, and 3 denotes an air guide which is arranged at a position parallel to the fan 2 and guides an air flow from the fan 2 into the motor. , Which are the same as the conventional example. Reference numeral 7 denotes a fan case which includes the fan 2 and the air guide 3, and has an intake port 7a opened at the center and a flange 7b at the outer periphery. And
The flange portion 7b is brought into contact with the bracket end surface 4a and the fan-facing surface of the air guide 3 which faces the fan 2.
They are closely attached and press-fitted and fixed to the bracket outer peripheral portion 4b. Under the above configuration, when the motor rotates, air is sucked from the intake port 7a of the fan case 7, flows into the motor through the fan 2, the air guide 3, and is discharged to the outside of the motor while cooling the motor. .

 Next, the operation of this embodiment will be described.

The airflow discharged from the fan 2 is sent into the motor through the air guide 3. Here, the flange portion 7a of the fan case 7 is brought into contact with and in close contact with the bracket end surface 4a and the air guide 3, and is press-fitted and fixed to the outer peripheral portion 4b of the bracket, so that a small gap between the air guide 3 and the bracket 4 is provided. 6 to shut off the airflow leaking to the fan 2 side. Therefore, leakage of airflow can be prevented, and the air guide 3
The air flow passing through the motor smoothly flows into the motor. As a result, a reduction in vacuum pressure can be prevented, and efficiency can be improved.

In addition, press-fitting and sealing between the air guide 3 and the bracket 4 or sealing material, which have been required to prevent air current leakage, are not required, so that assembly is facilitated and automation can be achieved.

Further, by directly abutting the flange portion 7b of the fan case 7 on the bracket end surface 4a, the positioning at the time of press-fitting is facilitated, and the assembling property is further improved.

Effect of the Invention As described above, according to the present invention, the flange provided on the outer peripheral portion of the fan case is brought into contact with the bracket end face and the air guide.
By tightly fitting and pressing and fixing to the outer periphery of the bracket,
It is possible to suppress the leakage of the air flow, prevent the reduction of the vacuum pressure, and improve the efficiency.

Moreover, assembling is easy and automation can be achieved.
This is extremely advantageous in practical use.

[Brief description of the drawings]

FIG. 1 is a half sectional view of an electric blower showing an embodiment of the present invention, FIG. 2 is a half sectional view of a conventional electric blower, and FIG. 3 is a detailed view showing a flange portion of a conventional fan case. 2 ... fan, 3 ... air guide, 4 ... bracket,
4a ... bracket end face, 4b ... bracket outer peripheral part, 7 ...
… Fan case, 7b …… Flange part.

Claims (2)

(57) [Claims] 1. An electric blower having a fan case which has a flange portion on an outer peripheral portion and which is brought into contact with and in close contact with an end surface of a bracket and a fan-facing surface of an air guide to press-fit and fix the outer peripheral portion of the bracket. 2. The electric blower according to claim 1, wherein a small gap is provided between the bracket and the air guide.