JP3149499B2 - Electric blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, this type of electric blower generally has a configuration as shown in FIG.

That is, the motor 1 forms an outer shell by an air guide 4 for holding a load-side bearing 3 of a rotor 2, a non-load-side bearing 5, and a bracket 7 for holding a stator 6, and rotates toward the air guide 4. The shaft 8 protruded, and the impeller 10 was fixed to the shaft 8 with the nut 9. In front of the impeller 10, the casing 1
1 and the impeller 10
The intake port 11a was open to face the intake port 10a of the air conditioner.

[0004]

However, in such a conventional configuration, since the parting line P of the mold is located at a position as shown in the figure, the outer diameter D of the air guide 4 is smaller than the outermost diameter of the air guide 4. Since a plurality of volute chambers 12 are formed at the positions, the width a of the volute chamber 12 becomes smaller, resulting in a decrease in performance.

An object of the present invention is to solve the above-mentioned problems and to provide a high-performance electric blower by forming a volute chamber at the position of the outermost diameter of an air guide.

[0006]

SUMMARY OF THE INVENTION The present invention, in order to achieve the above object, that holds an impeller rotating together with the rotor, a casing for covering the upper portion of the impeller, a bearing fixed to the load side of the rotor Burake A and
An air guide fixed to the bracket A, and and a non-load-Lube La Ke <br/> Tsu preparative to retain the fixed bearing side B of the rotor, and the impeller opposed to the outer periphery of the air guide A volute chamber formed by a plurality of tongue walls, and the position of the end of the volute chamber is a parting line of a mold.

[0007]

According to the present invention, since the end of the volute chamber formed in the air guide is formed as a mold parting, the air flow can be improved because the volute chamber can be widened at the outermost periphery of the air guide. The performance can be improved.

[0008]

1 to 3 show an embodiment of the present invention.
It will be described based on.

In FIG. 2, reference numeral 21 denotes an electric blower main body (hereinafter abbreviated as a main body).
The rotor 24 into which the bearing 23 is press-fitted on both sides of the
Bracket A25 and bracket B2 formed of synthetic resin
6. The bracket B26 has a substantially cylindrical shape, holds the stator 27 at the center, and holds the brush holder 28 below the stator 27.
6a is open. An air guide 29 is fixed to the bracket A25. The shaft 22 projects through the air guide 29 on the load side of the rotor 24, and the impeller 30 is fixed to the shaft 22. The impeller 30 rotates together with the rotor 24 at a high speed (about 36,000 rpm). A casing 31 covers the upper part of the impeller 30, and the impeller 30
The intake port 31a is open to face the suction port 30a of the air conditioner.

As shown in FIGS. 1 and 3, an air guide 29 is provided.
Is provided with a volute chamber 33 formed by a plurality of tongue walls 32. The air guide 29 is formed of a synthetic resin, and the parting P of the mold coincides with the end of the volute chamber 33.

In the above configuration, when the impeller 30 rotates at high speed together with the rotor 24, air is sucked in from the suction port 30a of the impeller 30 and discharged from the outer periphery of the impeller 30. The discharged air flows into a volute chamber 33 formed by the plurality of tongue walls 32 of the air guide 29, and is gradually changed from a dynamic pressure to a static pressure, and
9, after entering the bracket B26 and cooling the rotor 24 and the stator 27, the bracket B2
The exhaust gas is discharged from an exhaust port 26a formed in the nozzle 6.

In this case, since the end of the volute chamber 33 formed in the air guide 29 and the parting P of the mold coincide (see FIG. 1), this portion has the maximum outer diameter and the width of the volute chamber 33 The dimension A can be the largest. Therefore, when the maximum outer diameter of the air guide 29 is the same, the largest space can be taken, the air can flow smoothly, and the performance can be improved. Also, as can be seen from FIG. 1, the fitting between the casing 31 and the bracket B26 can be configured without any gap,
The performance can be further improved.

[0013]

As is apparent from the above description, according to the electric blower of the present invention, by making the end of the volute chamber formed in the air guide coincide with the parting,
Since the space in the volute room can be maximized, performance can be improved.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of an electric blower according to an embodiment of the present invention.

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

FIG. 3 is a plan view of an air guide of the electric blower.

FIG. 4 is a half sectional view of a conventional electric blower.

[Explanation of symbols]

 23 Bearing 24 Rotor 25 Bracket A 26 Bracket B 29 Air guide 30 Impeller 31 Casing 32 Tong wall 33 Volute chamber

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Kato 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-56-81297 (JP, A) JP-A-2- 238196 (JP, A) JP-A-2-9998 (JP, A) JP-A-1-310199 (JP, A) JP-A-63-306299 (JP, A) JP-A-63-306298 (JP, A) JP-A-63-85298 (JP, A) JP-A-57-68199 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 29/42

Claims (1)

(57) [Claims] 1. A an impeller rotating together with the rotor, casing and, Lube racket A to hold the fixed bearing on the load side of the rotor covering an upper portion of the impeller
When the air guide fixed to the bracket A, and and a non-load-Lube <br/> racket to hold the fixed bearing side B of the rotor, the impeller opposed to the outer circumference of the air guide An electric blower in which a volute chamber formed by a plurality of tong walls is provided, and the end of the volute chamber is located at a parting line of a mold.