JP2001289196A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly efficient electric blower with a simple structure. SOLUTION: An impeller 11 is fixed to one end of a rotor 93, and a casing 12 is installed on the outer periphery of the impeller 11. A plurality of ribs 80 are formed on the mounting surface side of an anti-load side bracket 6 installed on a load side bracket 5 radially from the outer periphery in the center direction thereof, and an inclined surface 6a inclined downward is provided along the outer periphery of the rib 80. A plurality of cut-out parts are provided in the load side bracket 5 opposed to the radial ribs 80 so that air blown from the impeller is flown thereinto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower incorporated in a main body of electric equipment such as a vacuum cleaner.

[0002]

2. Description of the Related Art A conventional electric blower of this type has a structure as shown in FIG. The motor unit 32 includes a commutator 2 and an armature 1 having an armature winding 22.
Is wound around the outer periphery of the armature core 70. In the armature 1, bearings 4 are press-fitted at both ends of a motor shaft 3, and the bearings 4 are mounted on a load side bracket 5 and a non-load side bracket 6 respectively.
We support in. Reference numeral 7 denotes a brush holder made of metal having a built-in carbon brush 8 and held by the non-load side bracket 6. Reference numeral 9 denotes a field having a field winding 23. The field winding 23 is wound around an outer periphery of a field core 72.

[0003] The fan unit 10 has a load-side bracket 5.
And a rectifying air guide formed between the impellers 11 for sucking and blowing air, which are loads.
Is covered with a casing 12. Impeller 11
Is fixed to the shaft 3 by the spacer 13, the washer 14 and the nut 15, and rotates together with the shaft 3. Air
The guide 10 is fixed to the load-side bracket 5 with screws (not shown) or the like, and the load-side bracket 5 and the non-load-side bracket 6 are also fixed with screws (not shown) or the like. 1
Reference numeral 6 denotes an intake portion forming an intake port of the casing 12, which is fixed to the casing 12 by welding or the like.

[0004] The electric blower 19 is constructed in such a structure, and the blowing air generated by the rotation of the impeller 11 acts on the rectifying air guide 10 provided around the outlet of the impeller 11. After passing, the armature 1 of the motor part 32 and the winding of the field 9 are cooled,
The air is exhausted rearward from the plurality of openings 73 of the non-load-side bracket 6. In addition, when the electric blower 19 is incorporated in a vacuum cleaner, the structure is as shown in FIGS. The vacuum cleaner main body 61 (hereinafter referred to as the main body) is divided into a dust collecting chamber 51 and a motor chamber 52 by a partition wall 53 provided at a central portion.
4. An electric blower 19 is provided in the motor room 52. A connection pipe 60, a hose 59, a tip pipe 58, an extension pipe 57, and a suction tool 56 are connected to the main body 61. Accordingly, as an effect, dust collected from the suction tool 56 by the suction force of the electric blower 19 passes through the extension pipe 57, the tip pipe 58, the hose 59, and the connection pipe 60, and is collected in the paper bag 54 of the dust collection chamber 51. Can be

[0005]

However, in the above-mentioned conventional electric blower 19, the air guide 10 for rectifying the air blown out from the impeller 11 is indispensable for improving the efficiency of the electric blower 19 as well. However, since the shape of the air guide 10 is very complicated and requires dimensional accuracy, the cost of the air guide 10 itself increases, and as a result, the ratio of the cost to the cost of the electric blower 19 itself has increased.

The present invention solves the above-mentioned problems, and improves the shapes of the non-load-side bracket 6 and the load-side bracket 5 so that the two parts have the same shape as that of the conventional air guide 10. The aim is to reduce the number of points and to provide a less expensive electric blower.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotor, an impeller fixed to one end of the rotor, and a field having the rotor and a field winding. And a casing is provided on the outer periphery of the impeller from the impeller side, and a plurality of ribs are directed from the outer periphery toward the center on the mounting surface side of the anti-load side bracket with the load side bracket. In addition to forming radially, a slope inclined downward along the outer periphery of the rib is provided, and a cut-out portion on the load side bracket facing the radial rib is formed so that air blown out from an impeller flows into the load-side bracket. The air blown out of the impeller is opened by the radial ribs on the non-load side bracket and the cutouts on the load side bracket. Flowing from parts, passing through the radial ribs of the counter-load-side bracket and flows as cooling air field, the rotor. At this time, the radial rib provided on the non-load side bracket and the inclined surface inclined downward along the outer periphery of the rib can play a role of rectifying wind blown out from the impeller, that is, a role equivalent to an air guide. . Therefore, as described above, by improving the shapes of the load side bracket and the non-load side bracket and configuring the same shape as the air guide with the two parts, the number of parts is reduced, and the efficiency is further improved. In addition, the cost of the electric blower itself can be reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION
A rotor, an impeller fixed to one end of the rotor,
The rotor and the field having the field winding are included in the load side bracket from the anti-load side bracket and the impeller side,
A casing is provided on the outer periphery of the impeller, and a plurality of ribs are radially formed on the mounting surface side of the non-load-side bracket with the load-side bracket so as to face from the outer periphery toward the center direction. The load-side bracket opposed to the radial rib is provided with a plurality of cutouts for allowing the air blown out from the impeller to flow, and the blowout air discharged from the impeller is provided on the load side bracket facing the radial rib. Flows from the opening formed by the radial rib of the non-load-side bracket and the cutout of the load-side bracket, passes through the radial rib of the non-load-side bracket, and flows as cooling air into the field and the rotor. At this time, the radial rib provided on the non-load side bracket and the inclined surface inclined downward along the outer periphery of the rib can play a role of rectifying wind blown out from the impeller, that is, a role equivalent to an air guide. . Therefore, as described above, by improving the shape of the load-side bracket and the non-load-side bracket, and by configuring the same shape as the air guide with the two parts, while reducing the number of parts,
It is possible to further increase the efficiency and reduce the cost of the electric blower itself.

According to a second aspect of the present invention, in the first aspect of the present invention, a downwardly inclined surface provided along the outer periphery of the radial rib is inclined so that the rib side is downward. By doing so, the effect of rectifying the wind blown out from the impeller can be further improved, and the efficiency can be further improved.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the opening formed by the radial rib of the non-load-side bracket and the cut-out portion of the load-side bracket is provided. It is formed to be higher than the position of the rear shroud forming the rotor side,
The impeller-side standing wall of the load-side bracket that forms the opening serves as a guide blade that can more efficiently rectify the wind blown out from the impeller, and can achieve the same efficiency as a conventional diffuser type air guide. Becomes

According to a fourth aspect of the present invention, in the above-mentioned one of the first to third aspects, the radial rib of the non-load side bracket and the notch of the load side bracket are formed. The opening of the load-side bracket has a substantially U-shape. By forming the opening passage of the load-side bracket to have a substantially U-shape, the wind blown out from the impeller is formed as a separately divided flow path. Since the exhaust passage until the air blown from the air is guided to the field and the rotor can be formed longer, it is possible to obtain the same efficiency as the conventional diffuser type air guide.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the radial rib of the non-load side bracket and the cutout portion of the load side bracket are formed. When the air blown from the impeller passes through the flow path, the flow path cross section is a convex shape, and when the cross section of the flow path is convex, fluid stagnation occurs at the edge portion, which reduces the efficiency. On the other hand, by having the curved portion in the cross section of the flow path, it is possible to eliminate the stagnation of the fluid at the edge portion, and it is possible to further increase the efficiency.

According to a sixth aspect of the present invention, in the invention according to any one of the first to third aspects, the radial rib of the non-load side bracket and the cutout portion of the load side bracket are formed. The opening is formed so that the height of the opening is higher as it is closer to the outer periphery of the load-side bracket, and the lower part of the wall of the load-side bracket forming the opening is closer to the outlet of the impeller, The higher the distance, the further away from the outlet of the impeller, the wind noise (high-frequency sound) generated when the wind blown from the impeller crosses the impeller side wall surface of the opening can be reduced, and the efficiency can be improved. Becomes

According to a seventh aspect of the present invention, there is provided a vacuum cleaner having a dust collecting chamber for collecting dust therein and the electric blower according to any one of the first to sixth aspects, and has a high performance. In addition, it is possible to provide an inexpensive vacuum cleaner as compared with the related art.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. The same components as those of the related art are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 1, the wind blown from the impeller 11 is applied to the outer periphery of a surface facing when the load-side bracket 5 is fixed to the non-load-side bracket 6, that is, the outer periphery of the mounting surface of the anti-load-side bracket 6. A plurality of radial rectifying ribs 80 are provided from the outer periphery toward the center so as to flow while being focused toward the rotor 93 and the field (not shown). An inclined surface 6a is provided. Also, as shown in FIG.
A plurality of cutouts 81 are provided on the outer peripheral surface opposing to 0 so that the wind blown out from the impeller 11 flows smoothly toward the rectifying rib 80 provided on the non-load-side bracket 6. Next, as shown in FIG. 3, the anti-load side bracket 6 shown in FIG. 1 and the load side bracket 5 shown in FIG. Thus, it is possible to form a shape equivalent to that of a down-volume type air guide (a type having no guide blades on the outer periphery of the impeller 11).

Next, the operation will be described. As can be seen from the perspective view shown in FIG. 4, the air blown out from the impeller 11 flows along the inclined surface 6 a that is inclined downward along the outer periphery of the rib 80, and then cuts off the outer periphery of the load-side bracket 5. It flows into an opening 82 formed by the portion 81 and the rectifying rib 80 of the non-load side bracket 6. Then, it passes through the flow path and flows as cooling air into the rotor 93, which is a rotating body, and the field (not shown). That is, in the related art, it is necessary to separately provide the air guide 10 for rectification on the upper part of the motor unit 32 configured by the load-side bracket 5 and the non-load-side bracket 6, but according to the present embodiment, By combining the shapes of the load-side bracket 5 and the non-load-side bracket 6, the same shape and effect as those of the down-volume type can be obtained. It is possible to obtain while reducing the number of parts.

As a result, the cost of the electric blower 19 itself is generally raised because resin molding is more complicated and requires higher accuracy.
The cost of the electric blower 19 itself can be reduced. In addition, by inclining the inclined surface provided along the outer periphery of the radial rib 80 so that the side of the rib 80 is downward, the rectifying effect of the wind blown out from the impeller is further improved, and the efficiency is increased. Can be achieved.

Further, as shown in FIG.
Has a substantially U-shape raised above the height of the rear shroud 90 forming the rotor 93 side of the impeller 11. As can be seen from the perspective view of FIG.
A vertical wall portion 91 on the side of the impeller 11 where the top surface of the impeller 11 is raised above the rear shroud 90 of the impeller 11 serves as a guide blade capable of more efficiently rectifying the wind blown out from the impeller 11, and has a flow path shape. By dividing each of the flow paths into a substantially U-shape, the flow can be more efficiently rectified. That is, according to the present embodiment, the shape and effect equivalent to those of the diffuser type can be obtained by combining the shapes of the load-side bracket 5 and the non-load-side bracket 6. Can be obtained while reducing the number of parts. As a result, the diffuser type air guide generally raises the cost of the electric blower 19 itself because it is more complicated and requires higher precision especially in resin molding, and by reducing the air guide 10, the electric blower 19 itself is reduced. Cost can be reduced.

Further, an opening 82 provided in the load side bracket.
By devising the cross-sectional shape as shown in FIGS. 7 and 8, other various effects can be obtained. That is, in FIG.
Since the cross-sectional shape of the opening 82 has a curved portion, it is possible to eliminate fluid stagnation (loss) at an edge portion in the flow path, and it is possible to further increase efficiency. In FIG. 8, by forming the cross-sectional shape of the opening 82 such that the height of the flow path becomes higher toward the outer peripheral side, the wind blown out from the impeller 11 collides with the wall surface of the opening 82. Wind noise (high-frequency sound) can be reduced. Generally wind noise (high frequency sound)
It is already known that the smaller the distance between the outlet of the impeller 11 and the guide vane of the straightening member, the larger it becomes, but it is also known that the efficiency tends to decrease.

Therefore, the wall 9 forming the opening 82
2 is lower than the impeller 11, and the opening 82 is formed so that the wall 92 forming the opening 82 rises as the distance from the impeller 11 increases. Efficiency can be improved while reducing wind noise (high-frequency sound).

In addition, by providing an electric blower 19 as described in this embodiment in a dust collection chamber (not shown) for collecting dust therein, it is possible to reduce the cost and improve the suction performance. In addition, it is possible to provide a high-performance vacuum cleaner that is more inexpensive than the conventional vacuum cleaner.

[0022]

According to the present invention, since a rectifying air guide can be formed by the load side bracket and the non-load side bracket, the number of parts of the electric blower can be reduced, and the cost of the electric blower itself and the vacuum cleaner can be reduced. Down can be planned.

[Brief description of the drawings]

FIG. 1 is a top view of a non-load side bracket of an electric blower showing one embodiment of the present invention.

FIG. 2 is a top view of a load-side bracket of the electric blower.

FIG. 3 is an upper view of the electric blower when the anti-load side bracket and the load side bracket are assembled.

FIG. 4 is an enlarged perspective view of a channel of the electric blower.

FIG. 5 is a sectional view of a channel of the electric blower.

FIG. 6 is an enlarged perspective view of another flow channel of the electric blower.

FIG. 7 is an enlarged perspective view of another flow channel of the electric blower.

FIG. 8 is an enlarged perspective view of another flow path of the electric blower.

FIG. 9 is a partial side sectional view of a conventional electric blower.

FIG. 10 is an upper partial sectional view of the vacuum cleaner main body.

FIG. 11 is an external perspective view of the vacuum cleaner.

[Description of Signs] 5 Load-side bracket 6 Anti-load-side bracket 6a Inclined surface 11 Impeller 12 Casing 19 Electric blower 80 Rib 81 Notch 82 Opening 90 Rear shroud 91 Upright wall 92 Wall 93 Rotor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Tokuda 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshitaka Murata 1006 Odaka Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Go Nishimura 1006 Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 3B006 FA02 3H034 AA02 AA13 BB02 BB06 BB20 CC03 DD01 DD12 DD16 DD30 EE06 EE12 EE18

Claims (7)

[Claims] 1. A rotor, an impeller fixed to one end of the rotor, and a field having the rotor and a field winding are enclosed by a non-load side bracket and a load side bracket from the impeller side. A casing is provided on the outer periphery of the bracket, and a plurality of ribs are radially formed on the mounting surface side of the non-load-side bracket with the load-side bracket so as to extend from the outer periphery toward the center, and along the outer periphery of the rib. An electric blower provided with a plurality of cutouts provided on a load-side bracket opposed to the radial ribs, the cutouts being provided with an inclined surface that is inclined downward. 2. The electric blower according to claim 1, wherein a downwardly inclined surface provided along the outer periphery of the radial rib is inclined so that the side of the rib is downward. 3. An opening formed by a radial rib of the non-load-side bracket and a notch of the load-side bracket is formed to be higher than a position of a rear shroud forming a rotor side of the impeller. The described electric blower. 4. The electric blower according to claim 1, wherein the opening formed by the radial rib of the non-load-side bracket and the cutout of the load-side bracket has a substantially U-shape. . 5. The electric blower according to claim 1, wherein an opening formed by the radial rib of the non-load-side bracket and the cutout of the load-side bracket has a curved portion. 6. An opening formed by a radial rib of the non-load-side bracket and a notch of the load-side bracket, wherein the opening is formed to be higher toward the outer periphery of the load-side bracket. The electric blower according to any one of claims 3 to 3. 7. A dust collecting chamber for collecting dust therein, and a dust collecting chamber.
An electric vacuum cleaner comprising the electric blower according to any one of claims 6 to 6.