JPH0744796Y2 - Electric blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electric blower used in an electric vacuum cleaner or the like.

[Prior Art] An electric blower used for an electric vacuum cleaner has a stator having a stator core having a substantially rectangular outer shape, and a cylindrical portion for accommodating a rotor arranged inside the stator. A case main body formed by providing an annular flat surface portion projecting to the outside of the cylindrical portion at the opening edge at one end, an inner surface of the cylindrical portion, and a stator core of the stator core arranged so that corner portions are closely contacted with the inner surface. An air passage formed between the outer surface, a case end face plate attached to the annular flat surface portion, a fan attached to a rotor shaft penetrating a bearing support portion provided in the central portion of the case end face plate, and a peripheral Has a plurality of air inlets, and a plurality of rectifying air passages connected to these air inlets are formed on the inner surface, and is located between the fan and the one end opening of the case body. It is provided so as to cover and eject from the fan. It comprises a straightening vane that guides the blown air into the case body, and a fan cover that covers the straightening vane and the fan and is attached to the one end opening side of the case body.

In such an electric blower, when the fan is rotated, the air discharged from the fan flows into the rectification air passage through the air inlet of the rectifying plate, enters the case main body through this air passage, and enters the case main body. After flowing through the air passage, it is exhausted outside the case body.

Conventionally, as shown in FIGS. 7 and 8, there is known an electric blower that uses a case end face plate 1 having a substantially belt-like planar shape. The case end face plate 1 is arranged across the one end opening of the cylindrical portion 2a of the case main body 2 in the radial direction, and both ends thereof are fixed to the annular flat surface portion 2b.

An electric blower using such a case end face plate 1 has a pair of stator windings 3a that the stator 3 has the case end face plate 1.
In addition, since it is arranged closer to the stator core 3b side than the protruding end of the stator winding 3a, the axial length of the electric blower can be shortened, and the cost of the case end face plate 1 can be reduced, so that the entire blower can be reduced. It has an advantage that the cost can be reduced.

In FIGS. 7 and 8, 1a is a bearing support portion, 4 is a rotor, 4a is a rotor shaft, 5 and 6 are air passages in the case body 2, and 7a.
Is a straightening vane, 8 is a wind inlet, and 9 is a straightening air passage.

By the way, when fixing the case end face plate 1 to the case body 2, the case end face plate 1 is set by gripping the bearing support portion 1a of the case end face 1 with an automatic machine and pressing it against one end opening of the case body 2. The case end face plate 1 is required to have a certain degree of strength so as not to be deformed and the case end face plate 1 supports the rotor shaft 4a so as not to swing.

For this reason, the width of the case end face plate 1 cannot be unduly reduced, and the width is set to a certain width to secure the required strength.
As a result, the case end face plate 1 is provided so as to cover most of a part of the flow straightening plate 7 of the flow straightening air passages 9 (shown with dotted lines in FIG. 8).

[Problems to be Solved by the Invention] Therefore, as described above, the case end face plate 1 greatly obstructs the flow of the air flowing out from a part of the rectifying air passage 9, so that the case main body 2 extends from this air passage 9 portion. The flow of wind to the inner air passages 5 and 6 is easily stopped. This is an obstacle when increasing the amount of air from the rectifying plate 7 into the case body 2, and there is a problem that the air blowing performance is not good.

An object of the present invention is to obtain an electric blower capable of improving blowing performance with a simple structure.

[Means for Solving the Problem] The present invention is directed to a stator having a substantially rectangular outer shape and a stator having a pair of stator windings wound around the iron core, and a stator arranged inside the stator. A case body formed by providing an annular flat surface portion projecting to the outside of the cylindrical portion at an opening edge of the cylindrical portion for housing the rotor, an inner surface of the cylindrical portion, and a corner portion closely contacted with the inner surface. Between a pair of first air passages formed by interposing the stator core therebetween, and another position adjacent to the pair of first air passages. A pair of second air passages formed with the stator core interposed between the inner surface of the cylindrical portion and the outer surface of the stator core; While crossing the one end opening of the case body in the radial direction, the first and second air passages A case end face plate fixed to the annular flat surface portion and a stator end winding formed on each side of the case end face plate fixed to the annular flat surface portion. With a pair of first vents, a fan attached to the rotor shaft that penetrates a bearing support portion provided in the center of the transverse portion of the case end face plate, and a plurality of air inlets in the peripheral portion. It is formed by providing a plurality of rectifying air passages connected to the air inlet on the inner surface, is located between the fan and one end opening of the case body, is provided so as to cover the one end opening, and is discharged from the fan. It is premised on an electric blower equipped with a straightening vane that guides wind into the case main body, and a fan cover that covers the straightening vane and the fan and is attached to one end opening side of the case main body.

And, in order to achieve the above-mentioned object, in the transverse portion of the case end face plate, located on both sides of the bearing support portion at the center thereof, and the rectifying air passage of the rectifying plate covered with the transverse portion,
Second ventilation ports are provided so as to face and communicate with the one air passage in the case body facing the crossing portion.

[Operation] The second ventilation port of the transverse portion of the case end face plate guides one of the first and second air passages in the case body and the air discharged from the fan into the case body. Among the rectifying air passages of the rectifying plate, the rectifying air passages covered by the above-mentioned crossing portions are opposed to each other so that these two air passages communicate with each other. Therefore, the wind that has flowed into the rectifying air passage that is covered by the transverse portion of the case end face plate of the rectifying plate can flow into the case body through the second ventilation port. Therefore, apart from the pair of first vents which are provided on both sides of the case end face plate and which guide the wind to the stator winding side, the case end face plate is passed through the cross part of the case end face plate as described above. Since the air can flow from the straightening vane into the air passage inside the case body, the amount of air discharged from the straightening vane into the case body can be increased.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, 11 is an electric motor case, both of which are a case body 12 and a case end face plate 13 which are press-formed products made of sheet metal.
Consists of.

The case main body 12 is formed by opening an end of a cylindrical portion 15 with a bottom 14 on the side opposite to the bottom 14 and integrally providing an annular flat surface portion 16 projecting outward at the edge of the opening. A bearing support portion 17 is integrally formed in the central portion of the bottom 14 and has an annular flat surface portion.
A fitting cylinder portion 18 is integrally formed on the outer peripheral edge of the portion 16. Further, the case body 12 has a first air passage 26 and a second air passage 27 which will be described later.
An exhaust port 19 is provided on the downstream side.

The case body 12 accommodates a rotor 22 with a stator 20 and a commutator 21, and a pair of brush devices.
23 is attached, and these and the electric motor case form an electric motor section.

The stator 20 has a stator core 24 whose outer shape is almost rectangular.
And a pair of stator windings 25 wound around the iron core 24. A part of the stator winding 25 is the annular flat surface portion 16
It is projected to the fan 36 side described later. Further, the stator 20 is fixed in the case main body 12 with its corner portion being in close contact with the inner surface of the cylindrical portion 15. Due to this fixing, the cylindrical part
A pair of first air passages 26 and second air passages 27 are formed between the inner surface of 15 and the outer surface of the stator core 24, respectively. The pair of first air passages 26 are provided on both sides of the fixed iron core 24 with the fixed iron core 24 therebetween, and the pair of second air passages 27 adjacent to the first air passages 26 are different from the first air passages 26. Are provided on both sides of the stator core 24 with the stator core 24 interposed therebetween.

In the figure, 28 is the rotor shaft of the rotor 22, 29 and 30 are rotor shafts 2.
It is a bearing that supports 8.

The rotor shaft 28 penetrates a bearing 30 and a bearing support portion 31 which will be described later, and a tip made of a fan made of sheet metal via a nut 35.
36 is attached. The fan 36 is a centrifugal fan and has an intake port 37 at the center of the plate on the side opposite to the case end face plate 13 and the entire circumference thereof serves as the air outlet.

A rectifying plate 32 made of synthetic resin is arranged between the fan 36 and the one end opening of the case body 12. The current plate 32 has the same outer diameter dimension as the outer diameter dimension of the annular flat surface portion 16, and as shown in FIGS.
33 are provided at equal intervals, and a plurality of flow straightening vanes 34 are provided inside. A rectifying air passage 34a communicating with the air inlet 33 is formed between the adjacent rectifying blades 34.

The rectifying plate 32 has its peripheral portion fixed to the annular flat surface portion 16, and the central portion is fixed around the bearing supporting portion 31 of the case end face plate 13 described later to cover one end opening of the case main body 12. Has been. The rectifying air passage 34a of the rectifying plate 32
The protruding portion of the stator winding 25 is inserted in the above.

The fan 36 and the current plate 32 are covered with a metal fan cover 38 as shown in FIG. This cover 38
Is formed so as to have an air guide port 39 that enters the intake port 37 in the central portion, and is fitted and attached to the fitting cylinder portion 18.

In addition, as shown in FIGS. 3 to 5, the case end plate is
The cross-section 13 includes a transverse portion 13A, and has a planar shape, for example, a band shape. Bearing 3 is located in the center of the cross section 13A.
A bearing support portion 31 that supports 0 is integrally formed. The crossing portion 13A included in the case end face plate 13 is provided so as to escape from the pair of stator windings 25 and be located between them, and is provided across one end opening of the case main body 12 in the radial direction, and both ends thereof are It is fixedly attached to the annular flat surface portion 16.

By this attachment, the transverse portion 13A is arranged so as to face the second air passage 27, and the transverse portion 13A and the annular flat surface portion 16 are arranged.
A pair of substantially fan-shaped first vent holes 40 defined by these are formed between and. These first vents
40 are provided on both sides of the transverse portion 13A with the crossing portion 13A interposed therebetween, and the stator windings 25 are respectively provided in these first ventilation ports 40.
And the 1st wind path 26 is facing.

The portion of the case end face plate 13 excluding the bearing support portion 31 is arranged closer to the stator core 24 side than the protruding end of the stator winding 25 (in other words, the stator winding 25 is the first vent
Projected from 40. ), The required insulation distance is secured between the case end face plate 13 and the stator winding 25.

Then, the transverse portion 13A of the case end face plate 13 is located between the bearing support portion 31 and both ends overlapping the annular flat surface portion 16, in other words, located on both sides of the bearing support portion 31. 2 Vents 13a are opened respectively. These second vents 13a face the second air passage 27 in the case body 12 and a part of the rectifying air passage 34a of the rectifying plate 32 that guides the air discharged from the fan 36 into the case body 12. , Are provided to communicate these.

The outer shape and dimensions of the case end face plate 13 are the same as those of the conventional one, and the size of the through hole 13a is the same as that of the case end face plate 1.
It is needless to say that the strength required for 3 is not impaired, but in order to guarantee the strength required for the case end face plate 13, the thickness of the end face plate 13 can be appropriately increased.

When the electric blower having the above-described configuration is operated, the fan 36 is rotated together with the rotation of the rotor 22, so that the blower action shown by the arrow in FIG. 1 is performed. The arrow in FIG. 4 indicates the turning direction of the wind provided by the fan 36.

In this blowing action, the air is discharged from the fan 36 and the rectifying plate
The wind that has flowed into the inside of the straightening vane 32 from the wind inlet 33 of 32 is straightened while passing through the straightening air passage 34a. Then, the rectified air flows into the one end opening of the case body 12 facing the rectifying air passage 34a through the first ventilation port 40 without being disturbed by the case end face plate 13. Moreover, the wind in the part of the rectifying air passage 34a, which is covered and hidden by the crossing portion 13A of the case end face plate 13 so as to be covered with the one end opening, is the second ventilation port of the case end face plate 13. It passes through 13a and flows to the side of the second air passage 27 that faces it.

As described above, the crossing portion 13A of the case end face plate 13 of the current plate 32
The air that has flowed into the rectifying air passage 34a covered with can be made to flow into the case main body 12 through the second ventilation port 13a.

Therefore, not only the wind that flows from the rectifying plate 32 into the case main body 12 through the first ventilation port 40 without being obstructed by the case end face plate 13 but also the second ventilation port provided in the transverse portion 13A of the case end face plate 13 Since the air can be made to flow into the case body 12 from the straightening plate 32 through the case 13a, the amount of air flowing into the case body 12 can be increased. Thereby, the blowing efficiency of this electric blower can be improved.

Moreover, in realizing the above, since it can be realized simply by providing the second vent hole 13a in the transverse portion 13A of the case end face plate 13 which has been conventionally used, the possibility of realizing the method is extremely high.

Of course, the width of the transverse portion 13A of the case end face plate 13 is the same as the conventional width, and the second vent hole 13a is provided in a size that does not impair the strength required for the transverse portion 13A.
There is no possibility that the rotor shaft 28 will be deformed by the setting force of an automatic machine during assembly, or that the rotor shaft 28 will shake and vibrate during use.

Further, in the present invention, the crossing portion of the case end plate 13
The second vent hole 13a of 13A may be formed with a flange portion 13b over the entire circumference thereof toward the one end opening of the case body 12, as shown in another embodiment of FIG. The configuration other than the above points is the same as that of the above-described embodiment including a portion not shown.

In the case of carrying out in this way, the strength of the case end face plate 13 can be increased by the reinforcing action of the flange portion 13b, so that the second ventilation port 13a can be enlarged and discharged from the straightening plate into the case body. It is possible to secure a larger amount of air to be blown and the air blowing performance can be improved accordingly.

Moreover, in the embodiment shown in FIG. 6, the flange portion is
The base of 13b may be provided with a roundness 13c extending from the surface of the crossing portion 13A of the case end face plate 13 to the inner peripheral surface of the flange 13b.
By doing so, the air in the rectifying air passage can more easily pass through the second ventilation port 13a, which is useful for further improving the air blowing performance.

[Advantages of the Invention] According to the present invention described above, the stator is provided at the crossing portion of the case end face plate that covers a part of the straightening air passage of the flow straightening plate and is provided on both sides of the crossing portion in between. A second ventilation port different from the first ventilation port facing the winding is provided, and a part of the rectifying air passage covered by the crossing portion and an air passage provided to face the crossing portion in the case body. Therefore, in addition to the wind flowing into the case main body through the first ventilation port without being obstructed by the case end face plate, the wind can flow into the case main body through the second ventilation port. Therefore, it is possible to increase the amount of air discharged from the straightening vane, and as a result, as described above, it is possible to improve the air blowing performance while having a simple structure in which the second ventilation port is provided in the crossing portion. Play.

[Brief description of drawings]

1 to 5 show one embodiment of the present invention, FIG. 1 is an overall side view showing a partial cross section, FIG. 2 is an exploded perspective view of a part, and FIG. 3 is a motor part. FIG. 4 is a perspective view showing a part of FIG. 4, and FIG. 4 is a plan view of the electric motor section with the current plate attached.
FIG. 5 is a rear view showing the overlapping state of the current plate and the case end face plate. FIG. 6 is a sectional view of a part of a case end plate showing another embodiment of the present invention. 7 and 8 show a conventional example, FIG. 7 is a perspective view of an electric motor section, and FIG. 8 is a rear view showing an overlapping state of a current plate and a case end face plate. 12 ... Case body, 13 ... Case end plate, 13A ... Cross section, 1
3a ... second vent, 15 ... cylindrical part, 16 ... annular flat part, 20 ... stator, 22 ... rotor, 24 ... stator core, 25 ... stator winding,
26 ... First air passage, 27 ... Second air passage, 28 ... Rotor shaft, 32 ... Straightening plate, 33 ... Wind inlet, 34a ... Straightening air passage, 36 ... Fan, 38 ... Fan cover, 40 ... First ventilation mouth.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical portion for accommodating a stator core having a substantially rectangular outer shape, a stator having a pair of stator windings wound around the stator core, and a rotor arranged inside the stator. A case main body formed by providing an annular flat surface portion projecting to the outside of the cylindrical portion at the opening edge of one end of the cylindrical portion; the inner surface of the cylindrical portion; and the stator core arranged with the corner portions closely contacted with the inner surface. A pair of first air passages having the stator core formed between the inner surface of the cylindrical portion and the stator core at another position adjacent to the pair of first air passages. A pair of second air passages formed between the outer surface and the stator core are formed between the pair of second air passages and the pair of stator windings, and the one end opening of the case body is traversed in the radial direction. In addition to the above,
A case end face plate fixed to the annular flat surface portion and provided with a transverse portion facing one of the second air passages, and the stator formed on both sides of the transverse portion with the transverse portion interposed therebetween. A pair of first vents where the windings respectively face each other, a fan attached to a rotor shaft that penetrates a bearing support portion provided in the central portion of the transverse portion of the case end face plate, and a plurality of air inlets in the peripheral portion. And a plurality of rectifying air passages connected to these air inlets are formed on the inner surface, and are located between the fan and the one end opening of the case body, and are provided to cover the one end opening. An electric blower comprising: a straightening vane that guides the air discharged from a fan into the case body; and a fan cover that covers the straightening vane and the fan and is attached to one end opening side of the case body. At the crossing portion of the plate, on both sides of the central bearing support portion, the straightening airflow path of the straightening vane covered by the crossing portion and the one wind in the case body facing the crossing portion. An electric blower, each of which is provided with a second ventilation port that is in communication with the passage so as to face each other.