JPH08242553A - Motor-driven blower - Google Patents

Abstract

PURPOSE: To reduce the thicknesses of the vanes of a motor-driven blower without deforming the vanes so as to improve the performance of the blower by integrally forming a plurality of metallic vanes with an air guide. CONSTITUTION: A metallic casing 12 having intake ports 12a at the positions corresponding to the intake ports 11a of an impeller 11 covers the impeller 11 and an air guide 10 is provided between a load bracket and the impeller 11. It is important to increase the output of a motor-driven blower that the air taken in through intake pipes 16 at the intake ports 12a of the casing 12 is smoothly introduced to the inside of the blower through the air guide 10 without leakage. Therefore, the vanes 10b of the air guide 10b are made of a metal and integrally molded with a resin material. Consequently, the deformation of the vanes 10b of the air guide 10 which is apt to occur when the thicknesses of the vanes 10b are reduced can be prevented and the performance of the blower can be improved.

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 has a structure as shown in FIGS.

That is, 1 is an armature having a commutator 2, bearings 4 are press-fitted into both ends of a shaft 3, and the bearings 4 are supported by a load side bracket 5 and an anti-load side bracket 6. Reference numeral 7 denotes a brush holder having a brush 8 built therein, which is held by the anti-load side bracket 6. 9 is a field. Reference numeral 10 denotes an air guide made of a resin material formed between the load side bracket 5 and the impeller 11 serving as a load. Above the impeller 11, a casing 12 made of a metal material is covered and has an intake port 12a corresponding to the intake port 11a of the impeller 11. The impeller 11 is fixed to the shaft 3 by a spacer 13, a washer 14 and a nut 15, and rotates together with the shaft 3.

The air guide 10 is fixed to the load side bracket 5 with a screw (not shown) or the like at a position that does not obstruct the air passage, and the load side bracket 5 and the anti-load side bracket 6 are also screwed (see FIG. It is fixed with (not shown). 16
Is an intake pipe made of a resin material that forms the intake hole 12a of the casing 12, and is fixed to the casing 12 by welding or the like. Reference numeral 10a denotes a blade portion of the air guide 10, which is in contact with the casing 12. The electric blower 17 is configured with such a structure.

[0005]

In the case of such an electric blower 17, the impeller 11 starts to rotate by energization, and air is taken in from the intake port 11a of the impeller 11 through the intake pipe 16 of the intake port 12a of the casing 12. After passing through the air guide 10 so as to cool the inside of the electric blower 17, it is exhausted.

In recent years, the suction performance of electric vacuum cleaners has been dramatically improved, and has become high input and high output.
In addition, it has been automatically controlled like fuzzy control, and noise reduction has been attempted at each position.

In order to increase the output, it is more preferable that the air taken in through the intake pipe 16 of the intake port 12a of the casing 12 does not leak and is smoothly introduced into the electric blower 17 through the air guide 10. Has become important.

Therefore, in order to improve the performance, the thickness of the blade portion 10a of the air guide 10 is reduced, or the blade portion 1
It is important that the 0a and the casing 12 are securely in contact with each other. Further, the shape of the blade 10a is also important in order to reduce noise.

However, in order to improve the performance, the blade portion 1
If the thickness of 0a is to be thinned, it is very difficult to select a material in terms of heat resistance and moldability, and mass production cannot be performed. Therefore, it is necessary to secure a certain thickness, and performance cannot be improved.

Further, since the vane portion 10a is made of a resin material, the flatness of the contact surface with the casing 12 is difficult to be made, and leakage occurs from the contact surface with the casing 12 made of a metal material to deteriorate the performance. I was invited. In addition, the casing 12
Since it itself is also a metal material, the degree of close contact with the blade portion 10a is not reliable, and leakage has occurred.

Furthermore, noise (commonly known as NZ sound) caused by collision of air discharged from the impeller 11 with a coarse and dense pressure change at the blade portion 10a is a problem. As a countermeasure against this, the shape of the blade portion 10a is formed. However, it was difficult in terms of moldability.

An object of the present invention is to solve the above problems and to provide an electric blower having good performance, low noise, and excellent quality.

[0013]

The first means of the present invention for achieving the above object is to provide a load side made of a resin material for holding a field, an armature, and a bearing press-fitted into the armature shaft. It has a bracket and an anti-load side bracket.The load side bracket and the anti-load side bracket are fixed with screws, etc., and an air guide made of resin material is placed between the impeller, which is the load, and the load side bracket. While covering with a casing having an intake port corresponding to the impeller intake port,
A plurality of blades made of metal are integrally formed with the air guide.

The second means has an air guide in which a concave portion is formed at the tip of the blade toward the lower surface side from the upper surface side (contacting side with the casing).

The third means is to form one or a plurality of through holes in the side wall of the blade.

The fourth means is one in which the upper surface side of the blade (contact side with the casing) is integrally formed of a soft material.

A fifth means comprises an air intake pipe made of a resin material at the air intake port of the casing, and the air intake pipe is formed along the inner wall of the casing up to the contact portion with the blade of the air guide.

A sixth means is provided with an intake pipe made of a resin material at the intake port of the casing, and the intake pipe is formed along the inner wall of the casing up to the contact portion with the blade of the air guide. A concave portion is formed on the contact surface of the air guide with the blade, and a convex portion is formed on the substantially opposed surface of the air guide.

[0019]

According to the first means of the present invention, since the blade portion of the air guide is made of metal and integrally molded with the resin material, the deformation caused by thinning the blade portion of the air guide. It has become possible to reduce the wall thickness (thickness) that could not be obtained with the resin material without performing the above, and to improve the performance.

In the second means, the concave portion is formed at the tip of the blade of the air guide toward the lower surface side from the upper surface side (contacting side with the casing). It is possible to achieve low noise and high performance, as compared with the case where only the contacting side) is concave.

In the third means, since one or a plurality of through holes are formed in the side wall of the blade of the air guide, the air having a coarse and dense pressure change is relieved of pressure through the through holes. Therefore, low noise becomes possible.

In the fourth means, the upper surface side (contact side with the casing) of the air guide blade is integrally formed of a soft material, so that the soft material adheres tightly to the casing and ensures airtightness. Since there is no leakage, the performance can be improved.

In the fifth means, the intake port of the casing is provided with an intake pipe made of a resin material, and the intake pipe is formed along the inner wall of the casing up to the contact portion with the blade of the air guide. The air guide blades come into close contact with the surface of the intake pipe, ensuring air tightness and eliminating leakage, thus improving performance.

In the sixth means, an intake pipe made of a resin material is provided at the intake port of the casing, and the intake pipe is formed along the inner wall of the casing up to the contact portion with the blade of the air guide. Since the concave portion is formed on the contact surface of the air guide with the blade and the convex portion is formed on the substantially opposed surface to the impeller,
The blades of the air guide are in close contact with the surface of the intake pipe to ensure airtightness and prevent leakage, and the concave portion of the intake pipe plays a labyrinth effect to further ensure airtightness. Further, since the convex portion can prevent backflow of air on the upper surface of the impeller, the performance can be further improved.

[0025]

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

1 to 8, reference numeral 1 is an armature having a commutator 2, and bearings 4 are press-fitted at both ends of a shaft 3 to form the bearing 4.
Is supported by the load side bracket 5 and the anti-load side bracket 6. Reference numeral 7 denotes a brush holder having a brush 8 built therein, which is held by the anti-load side bracket 6.

Reference numeral 9 is a field. Reference numeral 10 denotes an air guide made of a resin material formed between the load side bracket 5 and the impeller 11 serving as a load. Above the impeller 11,
A casing 12 made of a metal material covers and has an intake port 12a corresponding to the intake port 11a of the impeller 11. The impeller 11 is fixed to the shaft 3 by a spacer 13, a washer 14 and a nut 15, and rotates together with the shaft 3.

The air guide 10 is fixed to the load side bracket 5 with a screw (not shown) or the like at a position that does not obstruct the air passage, and the load side bracket 5 and the anti-load side bracket 6 are also screwed (see FIG. It is fixed with (not shown).

Reference numeral 16 denotes an intake pipe made of a resin material which forms the intake hole 12a of the casing 12, and the casing 1
It is fixed to No. 2 by welding or the like. 10a is an air guide 1
It is a blade portion of 0 and is in contact with the casing 12. The electric blower 17 is configured with such a structure.

Reference numeral 10b is a blade portion made of metal for the blade portion 10a of the air guide 10, and is integrally formed with the other resin material portion 10c. 10d is a blade portion 1
It is a concave portion formed on the lower surface side 10g from the upper surface side 10f (contact side with the casing 12) at the tip portion 10e of 0b. Reference numeral 10h denotes a through hole formed at one or a plurality of positions on the side wall portion 10i of the blade portion 10b. 18 is a blade portion 10
It is a soft material formed on the upper surface side 10f (the contact side with the casing 12) of b, and is integrally formed with the blade portion 10b. Reference numeral 16a denotes a blade portion 1 of an air guide 10 of an intake pipe 16 made of a resin material at an intake port portion 12a of the casing 12.
It is a tight portion formed along the inner wall 12b of the casing up to the contact portion with 0b. Reference numeral 16b denotes a concave portion formed on a surface of the intake pipe 16 that abuts the blade portion 10b of the air guide 10, and a convex portion is formed on a surface that substantially faces the impeller 11.

In recent years, the suction performance of electric vacuum cleaners has been dramatically improved, and the input and output have been increased.
In addition, it has been automatically controlled like fuzzy control, and noise reduction has been attempted at each position.

In order to increase the output, it is more preferable that the air taken in through the intake pipe 16 of the intake port 12a of the casing 12 does not leak and is smoothly introduced into the electric blower 17 through the air guide 10. Has become important.

Therefore, according to the first embodiment, the blade portion 10b of the air guide 10 is made of metal and is integrally molded with the other resin material 10c.
The blade portion 10b can be made thinner than the resin material without causing deformation caused by thinning the blade portion 10b, and the performance can be improved.

According to the second embodiment, the air guide 10
At the tip portion 10e of the blade portion 10b, the concave portion 10 is formed toward the lower surface side 10g from the upper surface side 10f (contact side with the casing 12).
Since d is formed, it is possible to achieve low noise and high performance, as compared with the conventional one in which only the upper surface side 10f (contact side with the casing 12) has a concave shape. become.

According to the third embodiment, the air guide 10
Since one or a plurality of through holes 10h are formed in the side wall of the blade portion 10b, the pressure of air having a coarse and dense pressure change is relieved through the through holes 10h, which results in low noise. It will be possible.

According to the fourth embodiment, the air guide 10
Since the upper surface side 10f (the contact side with the casing 12) of the blade portion 10b is integrally formed of the soft material 18, the soft material 18 closely adheres to the casing 12 and the airtight is surely made to prevent leakage. Since it is eliminated, performance can be improved.

According to the fifth embodiment, the intake port 12a of the casing 12 is provided with the intake pipe 16 made of a resin material, and the intake pipe 16 is provided with the blade portion 10b of the air guide 10.
The blade portion 10b of the air guide 10 is connected to the suction pipe 1 because the blade contact portion is formed along the inner wall 12b of the casing.
It is in close contact with the surface of No. 6, and airtightness is surely eliminated to prevent leakage, so that performance can be improved.

According to the sixth embodiment, the intake port 12a of the casing 12 is provided with an intake pipe 16 made of a resin material, and the intake pipe 16 is provided with the blade portion 10b of the air guide 10.
Is formed along the inner wall 12b of the casing up to the contact portion with
Since the concave portion 16b is formed in the contact surface of the intake pipe 16 with the blade portion 10b of the air guide 10 and the convex portion 16c is formed in the substantially opposed surface with the impeller 11, the blade portion 10b of the air guide 10 is connected to the intake pipe 16b. Of the intake pipe 16 and the airtightness is surely secured to prevent leakage.
Since b plays a labyrinth effect, air tightness is further ensured. Further, since the convex portion 16c can prevent the backflow of air on the upper surface of the impeller 11, the performance can be further improved.

[0039]

As described above, according to the first means of the present invention, since the blade portion of the air guide is made of metal and integrally molded with the resin material, the blade portion of the air guide is thin. By doing so, the wall thickness (thickness) can be made thinner than that obtained by the resin material without causing deformation, and the performance can be improved.

According to the second means, since the concave portion is formed at the tip of the blade of the air guide toward the lower surface side from the upper surface side (contact side with the casing), the upper surface side ( It is possible to achieve low noise and high performance, as compared with a case where only the concave side is formed only on the contact side with the casing).

According to the third means, since one or a plurality of through holes are formed in the side wall portion of the blade of the air guide, air having a coarse and dense pressure change is applied with pressure through the through holes. Mitigation, which allows low noise.

According to the fourth means, since the upper surface side of the air guide blade (contact side with the casing) is integrally formed of a soft material, the soft material comes into close contact with the casing,
The air tightness is secured and there is no leakage, so performance can be improved.

According to the fifth means, the intake port of the casing is provided with an intake pipe made of a resin material, and the intake pipe is formed along the inner wall of the casing up to the contact portion with the blade of the air guide. Therefore, the blades of the air guide are brought into close contact with the surface of the intake pipe, and the air tightness is ensured to prevent leakage, so that the performance can be improved.

According to the sixth means, an intake pipe made of a resin material is provided at the intake port of the casing, and the intake pipe is formed along the inner wall of the casing up to the contact portion with the blade of the air guide. The air intake blade has a concave surface on the contact surface with the blade of the air guide and a convex surface on the surface substantially opposite to the impeller, so the air guide blade is in close contact with the surface of the intake pipe to ensure air tightness. In addition to eliminating leaks, the air intake tube becomes more reliable because the recess of the intake pipe plays the role of a labyrinth effect. Further, since the convex portion can prevent backflow of air on the upper surface of the impeller, the performance can be further improved.

[Brief description of drawings]

FIG. 1A is a plan view of an air guide of an electric blower according to a first embodiment of the present invention, and FIG. 1B is a sectional view of an air guide of the electric blower.

FIG. 2 is a partial perspective view of an air guide of the electric blower.

FIG. 3 is a side view of a blade portion of an air guide of an electric blower according to a second embodiment of the present invention.

FIG. 4 is a side view of a blade portion of an air guide of an electric blower according to a third embodiment of the present invention.

FIG. 5 is a side view of a blade portion of an air guide of an electric blower according to a fourth embodiment of the present invention.

FIG. 6 is a partial sectional view of a blade portion of an air guide of an electric blower according to a fifth embodiment of the present invention.

FIG. 7 is a partial sectional view of a blade portion of an air guide of an electric blower according to a sixth embodiment of the present invention.

FIG. 8 is a partially cutaway side view of the present invention and a conventional electric blower.

FIG. 9A is a plan view of an air guide of a conventional electric blower, and FIG. 9B is a sectional view of an air guide of the electric blower.

[Explanation of symbols]

 10 Air Guides 10a, 10b Blades 10d Recesses 10h Through Holes 12 Casing 16 Intake Pipe 16a Tight Part 16b Recess 16c Convex 18 Soft Material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshitaka Murata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Kazuhisa Morishita 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A load side bracket and a non-load side bracket made of a resin material for holding a field, an armature, a bearing press-fitted into the armature shaft, and a load side bracket, wherein the load side bracket and the counter load side bracket are screws. Etc., place an air guide made of resin material between the impeller that is the load and the load side bracket, cover the upper part of the impeller with a casing that has an intake port corresponding to the impeller intake port, and make it with metal An electric blower in which a plurality of blades are integrally formed with the air guide. 2. The electric blower according to claim 1, further comprising an air guide in which a concave portion is formed on a lower surface side of a tip end portion of the blade than on a contacting side with the casing which is an upper surface side. 3. The electric blower according to claim 1, wherein one or more through holes are formed in the side wall of the blade. 4. The electric blower according to any one of claims 1 to 3, wherein an abutment side of the upper surface of the blade with the casing is integrally formed of a soft material. 5. An intake pipe made of a resin material is provided at an intake port of the casing, and the intake pipe is formed along the inner wall of the casing up to the contact portion with the blade of the air guide.
The electric blower according to claim 1. 6. An air intake pipe made of a resin material is provided at an air intake port of the casing, and the air intake pipe is formed along an inner wall of the casing up to a contact portion with a blade of the air guide. 6. A concave portion is formed on a contact surface with the blade, and a convex portion is formed on a surface substantially facing the impeller.
The electric blower according to the item.