JP3175223B2 - 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 or the like.

[0002]

2. Description of the Related Art A conventional electric blower of this type is shown in FIGS.
Will be described.

[0003] As shown in FIG.
Holds the bearing 3 press-fitted into the shaft 2 and is fixed to the non-load-side bracket 4. An air guide 5 made of a synthetic resin material is provided between the impeller 6 as a load and the load side bracket 1. The upper part of the impeller 6 is covered with a casing 7, and the casing 7 has an intake port 7 a corresponding to the intake port 6 a of the impeller 6. The casing 7 is fixed by fitting the outer periphery 7b to the outer periphery 1a of the load side bracket 1.

The air passage 5 in the above air guide 5
The portion near the outer periphery that does not hinder the position a is fixed to the load-side bracket 1 with a screw 8 or the like, and the center fitting hole is pressed against the outer periphery of the central fitting protrusion of the load-side bracket 1. The projection 5b is formed (FIG. 5). Brush holder 9
Is held by the non-load side bracket 4. On the load side of the shaft 2, an impeller 6 includes a spacer 10 and a washer 1.
1 and a nut 12 to rotate with the shaft 2.

[0005]

In the case of such an electric blower, the impeller 6 starts rotating by energization, and air is sucked from the impeller 6 through the casing 7 and guided by the air guide 5 to pass through the inside of the electric blower. After that, it becomes exhausted. In recent years, the suction performance of vacuum cleaners has been dramatically improved, not only because of the improved efficiency of the impeller 6, the air guide 5, and the electric motor, but also because of the increase in the number of revolutions and power consumption of the electric blower. Can be

In the case of such an electric blower, the air guide 5 which plays a role of an air passage is strongly required to prevent the occurrence of turbulence, leakage, etc. of the air as much as possible.

However, the pressure applied to the casing 7, the impeller 6, the air guide 5 and the like is extremely high due to the dramatic improvement in the performance of the electric blower.
Air leakage is likely to occur.

In particular, a slight air leak is generated at the fitting portion between the central convex portion 5b of the air guide 5, which is a portion other than the air passage 5a of the air guide 5, and the load side bracket 1. As a result, there has been a problem that performance degradation occurs.

An object of the present invention is to solve this problem and to provide an electric blower having stable characteristics and excellent quality.

[0010]

A first means of the present invention for achieving the above object has a load side bracket and a non-load side bracket, and is provided between a load impeller and a load side bracket. to form an air guide made of a resin material, the upper impeller in an electric blower casing covering having an inlet corresponding to the impeller inlet, the central fitting hole portion of the air guide, in the direction opposite to the y Npera A lip having elasticity is formed by the formed concave portion, and the lip is fitted on the outer periphery of the central fitting convex portion of the load side bracket.

The second means is such that a convex portion is formed inside the lip, and the convex portion is fitted to a concave portion formed on the outer periphery of the fitting convex portion of the load side bracket.

[0012]

In the first means of the action The present invention, in the fitting hole of the center of the air guide, there is a lip which gave resiliency defined by a recess formed in the opposite direction to the Lee Npera, the lip Are fitted on the outer periphery of the central fitting projection of the load side bracket, and the lip is elastically bent toward the impeller on the negative pressure side. A slight air leak from the fitting portion can be further prevented, and the performance can be improved.

In the second means, a convex portion is formed inside the elastic lip of the air guide, and the convex portion fits into a concave portion on the outer periphery of the central fitting convex portion of the load side bracket. Therefore, rattling of the air guide can be prevented, and its performance can be further improved.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, an armature 21 having a commutator 22 has a shaft 23, and bearings 24 are press-fitted at both ends thereof. It is supported by a bracket 26. The brush holder 27 has a built-in brush 28 and is held by the non-load side bracket 26. 29 is a field. An air guide 30 made of a synthetic resin material is provided between the load-side bracket 25 and the impeller 31 serving as a load. The upper part of the impeller 31 is covered with a casing 32, and the casing 32 has an intake port 32a corresponding to the intake port 31a of the impeller 31. The impeller 31 is fixed to the shaft 23 by a spacer 33, a washer 34 and a nut 35.

Next, the characteristic configuration of the present invention will be described. A lip 30b having elasticity by a concave portion 30a in the opposite direction to the impeller 31 is formed on the inner peripheral portion of the center fitting hole of the air guide 30. The lip 30b is fitted to the center of the load side bracket 25 at the center. It is fitted on the outer periphery of the convex part.

A convex portion 30c is formed inside the elastic lip 30b of the air guide 30, and the convex portion 3 is formed on the outer periphery of the central fitting convex portion of the load side bracket 25.
A concave portion 25a in which 0c fits is formed.

Next, the operation and operation of the above configuration will be described. When the power is supplied, the impeller 31 starts rotating, and air is sucked from the impeller 31 through the casing 32, passes through the air guide 30, passes through the inside of the electric blower, and is exhausted.

In recent years, the suction performance of a vacuum cleaner has been dramatically improved. In order to achieve such high performance, in the case of an electric blower, the air guide 5 which plays a role of an air passage is provided. It is strongly required to prevent the occurrence of air turbulence or leakage as much as possible.

For this purpose, in the first configuration, a lip 3 provided with elasticity by a concave portion 30a formed in the opposite direction to the impeller 31 is provided in the center fitting hole of the air guide 30.
0b, the outer periphery of the central fitting projection of the load-side bracket 25 is fitted, so that slight air leakage from the central fitting portion between the air guide 30 and the load-side bracket 25 can be prevented, and the performance can be improved. Can be improved.

The lip 30b is connected to the impeller 3 on the negative pressure side.
Because it is elastically bent toward 1, the air leakage can be further prevented.

In the second configuration, the air guide 30
The protrusion 30c is formed inside the resilient lip 30b, and the protrusion 30c fits into the recess 25a on the outer periphery of the center fitting protrusion of the load-side bracket 25, so that the rattle of the air guide 30 is achieved. Can be prevented, so that the performance is further improved. In addition, a labyrinth effect is also exerted, and air hardly leaks.

[0023]

The present invention As apparent from the above description of the embodiments according to the present invention is the fitting hole of the central et ah guides, forming a lip which gave elasticity by the recess formed in the impeller opposite direction And the lip is elastically bent toward the impeller on the negative pressure side, so that the center portion of the air guide and the load side bracket are connected to each other. Slight air leakage from the fitting portion can be further prevented, and the performance can be improved.

Also, since a convex portion is formed inside the elastic lip of the air guide and the convex portion is fitted to the concave portion of the fitting portion of the load side bracket, rattling of the air guide can be prevented. The performance is further improved. And, since there is no backlash in the assembling process, assemblability can be improved.

[Brief description of the drawings]

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

FIG. 2 is a partially enlarged sectional view of an air guide of the electric blower.

FIG. 3 is a partially enlarged sectional view of an air guide according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional electric blower.

FIG. 5 is a partially enlarged sectional view of the air guide.

[Explanation of symbols]

 25 Load side bracket 25a Depression 26 Anti-load bracket 30 Air guide 30a Depression 30b Lip 30c Convex part 31 Impeller 31a Inlet 32 Casing 32a Inlet

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuyoshi Tokuda 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. (56) References JP-A-4-183996 (JP, A) JP-A-2- 233898 (JP, A) JP-A-61-49198 (JP, A) JP-A-62-243999 (JP, A) Japanese Utility Model Application No. 59-107997 (JP, U) Japanese Utility Model Application No. 56-89061 (JP, U) Japanese Utility Model Application Showa 60-194191 (JP, U) Japanese Utility Model Application Showa 56-133998 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 29/08 F04C 29/42

Claims (2)

(57) [Claims] An air guide made of a synthetic resin material is provided between an impeller serving as a load and a load-side bracket, and an intake corresponding to an impeller intake port is provided above the impeller. The casing with the opening is covered, and the center fitting hole of the air guide is
The elasticity is provided by the concave part formed in the opposite direction to the impeller.
Lip, and place the lip in the load side bracket.
An electric blower fitted on the outer periphery of the central fitting projection . Wherein a convex portion is formed on the inner side of the lip, the electric blower according to claim 1, wherein the fitting in a recess formed the convex portions on the outer periphery of the fitting convex portion of the load-side bracket.