JPH0587096A - Electric motor driven blower - Google Patents

Abstract

PURPOSE:To provide an electric motor driven blower in which the deformation of an air guide caused by beat, etc., is prevented, target performance achievement is reached, cost reduction is possible, and a characteristic is stable. CONSTITUTION:There are provided a load-side bracket 5 and antiload-side bracket 6 for holding bearings 4 pressed in the shaft 3 of an armature 1, an air guide 11 comprising a resin material and formed between an impeller 10 and the load-side bracket 5, and a casing 12 covering the upper area of the impeller 10 and having an air intake port 12a corresponding to an impeller air intake port 10a. A projected part 11b is formed at the impeller side end face 11a on the air guide outer periphery to fix the projected part 11b by the casing 12 and the antiload-side bracket 6.

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 In recent years, in electric blowers used for electric vacuum cleaners and the like, there is an increasing demand for electric blowers which can form an air guide in a desired shape and have stable characteristics capable of achieving target performance.

A conventional electric blower will be described with reference to FIGS. 13 and 14. As shown, the shaft 21
The load-side bracket 23 that holds the bearing 22 press-fitted in is fixed to the anti-load-side bracket 24 having a built-in field armature (not shown), and a resin is provided between the impeller 25 that is a load and the load-side bracket 23. Air guide made of material 2
6 is formed. And above the impeller 25,
A casing 27 having an intake port 27a corresponding to the intake port 25a of the impeller 25 is provided so as to cover the impeller 25, and an outer periphery 27b of the casing 27 is provided on the load side bracket 2.
3 was fitted and fixed to the outer periphery 23a.

The air guide 26 has an air passage 26a.
The screw 28 is fixed to the load side bracket 23 in the vicinity of the outer periphery thereof so as not to interfere with the above.

The brush holder 29 is held by the bracket 24 opposite to the load side, and the impeller 2 is attached to the load side of the shaft 21.
5 was fixed by a spacer 30, a washer 31 and a nut 32 and was configured to rotate with the shaft 21.

[0006]

In the structure of such a conventional electric blower, the impeller 25 starts to rotate by energization, and the air is sucked from the impeller 25 through the casing 27, passes through the air guide 26, and passes through the inside of the electric blower. It will be exhausted later. In recent years, the suction performance of vacuum cleaners has improved dramatically, and the impeller 2
5 not only improves the efficiency of the air guide 26 and the electric motor, but also improves the rotation speed and power consumption of the electric blower.

That is, in the case of such an electric blower, the air guide 25, which plays the role of an air passage,
The air guide 26 made of a resin material is caused by frictional heat caused by extremely high-speed air collision, radiant heat from the electric motor side, or the like.
Is easily deformed by heat.

In order to prevent deformation due to heat, the screw 28
However, since the air guide 26 has an air passage 26a formed on the outer periphery thereof, the screw 28 cannot be stopped and it is difficult to prevent thermal deformation of the air passage 26a. However, this air passage 26a is an important part in terms of performance, and changes in the passage area due to deformation and the casing 2
The deterioration in performance due to the decrease in airtightness with No. 7 becomes remarkable. That is, there has been a problem of preventing deformation due to heat.

Further, in order to fix the peripheral portion of the air guide 26, the screw 28 or the like must be used, and the shape of the air guide 26 can be restricted, so that the target performance cannot be achieved, and the production is not possible. It was also a problem that the cost was increased in terms of sex.

An object of the present invention is to solve this problem and to provide a cost-effective electric blower with stable characteristics and excellent quality.

[0011]

In order to achieve the above object, the electric blower of the present invention has a first means, which is a load for holding a field, an armature, and a bearing press-fitted to the shaft of the armature. Side bracket and anti-load side bracket, an air guide made of a resin material formed between a load impeller and a load side bracket, and a casing having an intake port corresponding to an impeller intake port covering the upper side of the impeller. And a ring-shaped protrusion is formed on the end face of the outer periphery of the air guide on the impeller side, and the protrusion is pressed and fixed by the casing and the anti-load side bracket.

The second means is one in which a plurality of protrusions are formed on the end face of the outer periphery of the air guide on the impeller side, and a notch is formed in the anti-load side bracket so that the protrusions fit correspondingly. is there.

The third means is to form a plurality of protrusions on the end face of the outer periphery of the air guide on the side opposite to the load side bracket.

The fourth means forms a plurality of protrusions between the end face on the impeller side of the outer periphery of the air guide and the end face on the anti-load side bracket, and a mold is formed on the end face of the protrusion of the air guide on the impeller side. The parting surface is formed.

The fifth means is to form a mold parting surface on the end face of the protrusion of the air guide on the side opposite to the load side bracket.

[0016]

According to the present invention, by the construction of the above-mentioned first means, a ring-shaped projection is formed on the end face of the air guide on the impeller side on the outer periphery of the air passage, and the projection is pressed and fixed by the casing and the anti-load bracket Since the air guide can be prevented from being deformed by heat or the like, it is possible to prevent the characteristics of the electric blower from being deteriorated.

Since no screw or the like is used in the vicinity of the outer periphery of the air guide, the air guide can be designed in a desired shape, the target performance can be achieved, and the cost can be reduced. became.

By the second means, a plurality of protrusions are formed on the end surface of the outer periphery of the air guide on the impeller side, and the notch is formed on the anti-load side bracket so that the protrusions fit correspondingly. Therefore, unlike the first means, since the air guide is not entirely present in the axial fitting between the casing and the anti-load side bracket, the air guide pressed against the casing and the anti-load side bracket is pressed. It is possible to prevent rattling between the casing and the anti-load side bracket, which is generated due to the fatigue of the protruding portion due to heat. That is, the performance is further improved.

Further, since the notch is formed,
The air guide and the anti-load side bracket can be easily aligned with each other, and the assemblability can be improved.

Further, since the plurality of protrusions are formed on the end face of the outer periphery of the air guide on the side opposite to the load side bracket by the third means, the protrusions are formed by utilizing the elasticity of the air guide made of the resin material. Since it is fitted in the notch formed corresponding to the anti-load side bracket, rattling of the air guide can be prevented without fitting the casing.

Also, in the assembling process, there is no rattling when the air guide is set, so that the assembling property can be improved.

By means of the fourth means, a plurality of protrusions are formed between the end face on the impeller side of the outer periphery of the air guide and the end face on the anti-load side bracket, and a mold is formed on the end face of the air guide on the impeller side. Since the parting surface is formed, the air guide and the casing on the impeller side, and the air guide and the anti-load side bracket on the anti-impeller side have the same draft draft direction on the opposite side of the projection. It will be composed. Therefore, air tightness is ensured at the outer periphery of the air guide, and the performance can be improved.

By the fifth means, the parting surface of the mold is formed on the end face of the protrusion of the air guide on the side opposite to the load side bracket, so that a corner radius is easily formed on the end face of the protrusion on the impeller side. Can be formed. Therefore, the assemblability of the casing can be improved.

[0024]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

As shown in the drawing, the armature 1 has a commutator 2, and bearings 4 are press-fitted at both ends of a shaft 3. The bearing 4 is supported by a load side bracket 5 and an anti-load side bracket 6. ing. A brush holder 8 containing a brush 7 is held by the anti-load side bracket 6, and a field 9 is provided outside the armature 1. Then, an air guide 11 made of a resin material is formed between the load side bracket 5 and the impeller 10 serving as a load, and the upper part of the impeller 10 is located above the casing 1.
2 has an intake port 12a corresponding to the intake port 10a of the impeller 10, and the impeller 10 includes a spacer 13 and a washer 14
And is fixed to the shaft 3 by a nut 15. Also,
On the impeller side end surface 11a of the outer periphery of the air guide 11,
A ring-shaped protruding portion 11b is formed, and the protruding portion 11b is fixed by pressure contact in the axial direction by the casing 12 and the anti-load side bracket 6. The casing 12 is fitted and fixed to the outer circumference of the anti-load side bracket 6.

Next, the operation and action of the above configuration will be described. Due to the energization, the impeller 10 starts to rotate and air is taken in from the impeller 10 through the casing 12, passes through the air guide 11 and the inside of the electric blower, and is then exhausted. High heat due to radiant heat from.

The heat inevitably affects the air guide 11 made of a resin material and causes thermal deformation.

However, in the construction of the first embodiment, the end face 1 on the impeller side of the air guide 11 on the outer periphery of the air passage.
A ring-shaped protrusion 11b is formed on the casing 1a, and the casing 12
Since the protrusion 11b is pressed and fixed by the anti-load side bracket 6, the deformation of the air guide 11 due to heat or the like can be prevented, so that the deterioration of the characteristics of the electric blower can be prevented.

Since it is not necessary to use screws or the like in the vicinity of the outer periphery of the air guide 11, it is possible to design the air guide 11 in a desired shape, so that the target performance can be achieved and the cost can be reduced. It has become possible.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to FIGS. The first
The same parts as those in the embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in the drawing, a plurality of protrusions 11c are formed on the end face 11a of the air guide 11 on the impeller side,
A plurality of cutouts 6a into which the protrusions 11c are fitted are formed in the anti-load side bracket 6.

In the above structure, a plurality of protrusions 11c are formed on the impeller side end surface 11a on the outer periphery of the air guide 11, and the notch 6a is formed on the anti-load side bracket 6 so that the protrusions 11c fit. Since the casing 12 and the counter-load side bracket 6 are fitted in the axial direction entirely by the air guide 11, the casing 1 is not provided.
The casing 1 generated from the fatigue of the protrusion of the air guide 11 pressed against the bracket 2 and the anti-load side bracket 6 due to heat
It is possible to prevent rattling between the bracket 2 and the anti-load side bracket 6, and the performance is further improved.

Further, since the notch 6a is formed, the air guide 11 and the anti-load bracket 6 can be easily aligned with each other, and the assemblability can be improved.

(Third Embodiment) A third embodiment of the present invention will be described below with reference to FIGS. 7 and 8.

As shown in the figure, a plurality of protrusions 11e are formed on the end face 11d on the anti-load side bracket side of the outer periphery of the air guide 11, and a plurality of notches 6b to which the protrusions 11e are fitted are provided on the anti-load side. It is formed on the bracket 6.

In the above structure, a plurality of projections 11 are formed on the end face 11d on the counter-load side bracket side on the outer periphery of the air guide 11.
Since e is formed, it is sufficient to use the elasticity of the air guide 11 made of a resin material to fit the protrusion 11e into the notch 6b formed corresponding to the anti-load side bracket 6 to form the casing. It is possible to prevent rattling of the air guide 11 without fitting 12 together.

(Fourth Embodiment) A fourth embodiment of the present invention will be described below with reference to FIGS. 9 to 11.

As shown in the figure, the end face 11a of the air guide 11 on the impeller side and the end face 11d on the counter load side of the bracket side.
A plurality of projections 11f are formed on the upper surface of the mold, and the parting surface 16 of the mold is formed on the impeller side end surface 11g of the projections 11f.

In the above structure, a plurality of protrusions 11f are formed between the impeller side end face 11a on the outer periphery of the air guide 11 and the anti-load side bracket side end face 11d, and the impeller side end face of the protrusion 11f of the air guide 11 is formed. Since the mold parting surface 16 is formed on 11 g, the protrusion 1
At the boundary of 1f, the air guide 11 and the casing 12 are arranged on the impeller 10 side, and the draft directions of the air guide 11 and the anti-load side bracket 6 on the side opposite to the impeller 10 coincide with each other. Therefore, air tightness is ensured at the outer periphery of the air guide 11, and the performance can be improved.

(Fifth Embodiment) A fifth embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, the parting surface 16 of the mold is formed on the end face 11b of the protrusion 11f on the side opposite to the load side bracket.

In the above structure, since the parting surface 16 of the mold is formed on the end face 11b of the protrusion 11f of the air guide 11 on the anti-load side bracket side, a corner radius is easily formed on the end face 11g of the protrusion 11f on the impeller side. Can be formed. Therefore, the assemblability of the casing 12 can be improved.

[0043]

As is apparent from the above embodiments, according to the present invention, a ring-shaped protrusion is formed on the end face of the air guide on the impeller side of the outer periphery of the air passage, and the casing and the anti-load side bracket form the above-mentioned structure. Since the protrusion is fixed by pressing, the deformation of the air guide due to heat etc. can be prevented, and the deterioration of the characteristics of the electric blower can be prevented.

Since it is not necessary to use screws or the like in the vicinity of the outer periphery of the air guide, the air guide can be designed in a desired shape, the target performance can be achieved, and the cost can be reduced. Become.

Since a plurality of protrusions are formed on the end face of the impeller on the outer periphery of the air guide, and the notch is formed in the anti-load side bracket so that the protrusions fit correspondingly,
It is possible to prevent rattling between the casing and the anti-load side bracket, which further improves the performance. Further, since the notch is formed, the air guide and the anti-load side bracket can be easily aligned with each other, and the assembling property can be improved.

Further, by forming a plurality of protrusions on the end face of the bracket opposite to the load on the outer periphery of the air guide, and by fitting the protrusions into the notches formed corresponding to the bracket, the air guide of the air guide can be fitted without fitting the casing. It is possible to prevent rattling.

Since the parting surface of the die is formed on the end face of the protrusion of the air guide on the impeller side, the air guide and the casing on the impeller side and the air guide on the opposite side of the impeller are separated from the protrusion. Since the draft directions of the molds of the load side brackets coincide with each other, the air tightness at the outer periphery of the air guide is ensured and the performance can be improved.

Further, since the parting surface of the die is formed on the end face of the protrusion of the air guide on the side opposite to the load side bracket, it is possible to easily form a corner radius on the end face of the protrusion on the impeller side. It is possible to provide an electric blower that brings about hardening such as improvement of the assembling property of the casing.

[Brief description of drawings]

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

FIG. 2 is a plan view of the air guide.

FIG. 3 is a partial side view of the air guide.

FIG. 4 is a partial side view of an air guide according to a second embodiment of the present invention.

FIG. 5 is a plan view of the air guide.

FIG. 6 is a side view of the counter-load side bracket.

FIG. 7 is a side sectional view of an electric blower according to a third embodiment of the present invention.

FIG. 8 is a partial side view of the air guide.

FIG. 9 is a side sectional view of an electric blower according to a fourth embodiment of the present invention.

FIG. 10 is a partial side view of the air guide.

FIG. 11 is a partially enlarged side sectional view of the outer periphery of the air guide.

FIG. 12 is a partially enlarged side sectional view of an outer periphery of an air guide according to a fifth embodiment of the present invention.

FIG. 13 is a side view of a conventional electric blower with a part broken away.

FIG. 14 is a plan view of the air guide.

[Explanation of symbols]

 1 Armature 3 Shaft 4 Bearing 5 Load side bracket 6 Anti-load side bracket 6a, 6b Notch 9 Field 10 Impeller 10a Impeller inlet 11 Air guide 11a, 11g Impeller side end face 11b, 11c, 11e, 11f Projection 11d , 11h Anti-load side bracket side end surface 12 Casing 12a Intake port 16 Parting surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Go Tokuda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A field magnet, an armature, a load side bracket and a non-load side bracket for holding a bearing press-fitted into the armature shaft, and a load impeller and a load side bracket. An air guide made of resin material,
A casing having an intake port corresponding to an impeller intake port that covers the upper side of the impeller, a ring-shaped protrusion is formed on the end face of the outer periphery of the air guide on the impeller side, and the protrusion is formed by the casing and the anti-load side bracket. An electric blower that is fixed by pressure. 2. The electric blower according to claim 1, wherein a plurality of protrusions are formed on the end face of the outer periphery of the air guide on the impeller side, and notches are formed in the anti-load side bracket so that the protrusions fit correspondingly. 3. The electric blower according to claim 2, wherein a plurality of protrusions are formed on the end face of the outer periphery of the air guide on the side opposite to the load side. 4. A plurality of projections are formed between the impeller side end surface of the outer periphery of the air guide and the anti-load side bracket side end surface,
The electric blower according to claim 2, wherein a parting surface of the mold is formed on an impeller-side end surface of the protrusion of the air guide. 5. The electric blower according to claim 4, wherein a parting surface of the mold is formed on an end surface of the protrusion of the air guide on the side opposite to the load side bracket.