JPH09209989A - Electric blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower which can increase a correspondence property for the change of the winding specification of a stator winding while restraining the vibration of a case end surface plate without accompanying an enlargement. SOLUTION: A motor case 11 hating a wind take in port 40 is provided with a rotator 22 having a rotator shaft 28 connected to a fan 36, a cylindrical case main body 12 with a bottom in which the stator 20 is stored and a case end surface plate 13 having a crossing part for crossing the one end opening part of this main body 12. The stator 20 has a stator winding 25 whose one pert is entered in the wind take in port 40. A reinforcement flange 13c formed foldingly respectively on both side edges of the crossing part positioned between the fan 36 and the said one end opening part is erected and installed to the fan 36 side. Thereby, an isolation distance G between the flange 13c and the stator winding 25 is enlarged by keeping away the reinforcement flange 13c from the said one part of the stator winding 25.

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 example, in an electric vacuum cleaner to generate a suction airflow.

[0002]

2. Description of the Related Art As shown in FIGS. 17 and 18, a motor case 51 included in an electric blower used in an electric vacuum cleaner is provided with an annular flat portion 53 protruding outward at an opening edge of a cylindrical wall 52. Has a bottomed cylindrical case body 56 for housing the stator 54 and the rotor 55, and a bearing support portion 59a to which a bearing 58 for supporting the rotor shaft 57 of the rotor 55 is attached. Ring-shaped flat portion 53
And a case end face plate 59 attached to the.

Further, the motor case 51 has a wind inlet 60 on the case end face plate 59 side, and
An exhaust port 61 is provided on the bottom wall 56a side of the case body 56. The air intake port 60 and the exhaust port 61 communicate with each other through an air passage 62 in the case. As shown in FIG. 18, the case end face plate 59 crosses one end opening of the case main body 56, and the pair of the air intake ports 60 forming a substantially fan shape are formed by the crossing portion and the annular flat surface portion 53. There is.
These wind inlets 60 have stator windings 5 of the stator 54.
4a is facing. In this case, the stator winding 54a may face the wind intake port 60 (see FIG. 17) or may not face it.

A pair of brush devices 63, which are located on the bottom wall 56a side of the cylindrical wall 52 of the case main body 56, are mounted corresponding to the commutator 55a of the rotor 55. A fan 64 is attached to the rotor shaft 57 penetrating the bearing support portion 59a and the bearing 58, and the fan 64 is covered between the fan 64 and the annular flat portion 53 by covering one end opening of the case body 56. A rectifying plate 66 having a plurality of rectifying air passages 65 on its inner surface that guides the air discharged from the inside of the case body 56 through the air intake port 60 is arranged. As shown in FIGS. 17 and 20, a case end face plate 59 is internally provided on the inner surface of the current plate 66. The fan 64 and the current plate 66 are covered with a fan cover 67 attached to the one end opening side of the case body 56.

In the electric blower having such a structure, when the fan 64 thereof is rotated, the air discharged from the air blower flows into the rectifying air passage 65 through the air inlet 66a of the rectifying plate 66, and from the air passage 65. Case body 56 through the inlet 60
After entering the inside and circulating through the air passage 62 in the case, the exhaust port 6
The air is exhausted to the outside of the case main body 56 from 1.

In this electric blower, the case end face plate 59 is provided with reinforcing flanges 59b at both side edges of the transverse portion forming the air intake port 60 as shown in FIG. These flanges 59b are formed in order to improve the strength of the case end face plate 59 and suppress vibrations during operation of the electric blower. Conventionally, both flanges 59b are shown in FIGS. 17 and 18. As shown in the drawing, the case body 56 is erected and bent toward the inside.

[0007]

By the way, the performance of the electric blower differs depending on the model and application of the electric vacuum cleaner in which the electric blower is incorporated. This can be dealt with by changing the winding specifications such as changing the number of turns and the wire diameter of the wire 54a.

However, a part of the stator winding 54a is provided so as to face the air intake port 60, and the air intake port 60 is also provided.
In the conventional configuration in which the reinforcing flange 59b of the case end face plate 59 that divides the case projects toward the inside of the case main body 56, the reinforcing flange 59b approaches a part of the stator winding 54a that faces the air intake port 60. Since it is bent in the direction, it is difficult to secure a large insulation distance (see g in FIG. 17) between them. If the axial length of the case main body 56 is increased so that the part of the stator winding 54a is closer to the bottom wall 56a side with respect to the one end opening of the case main body 56, the insulation distance can be increased. Although a large g can be secured, doing so is not preferable because the electric blower becomes longer in the axial direction.

Therefore, without changing the axial length,
Increase the number of turns of the stator winding 54a according to the application,
When the stator winding 54a having a large wire diameter is adopted, a part of the stator winding 54a facing the air intake port 60 and the reinforcing flange 59b are brought close to each other, and a necessary insulation distance g is provided between them.
It is easy to lose As a result, the conventional electric blower has a problem that the changeability of the winding specification is low.

Therefore, the problem to be solved by the present invention is to increase the adaptability to the change of the winding specification of the stator winding without increasing the size and suppressing the vibration of the case end plate. It is to provide an electric blower that can.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a bottomed cylindrical case main body having a stator and a rotor accommodated therein, and an annular plane portion projecting outward at one opening edge is formed, and the annular plane. A case end face plate having a crossing part that is attached to the end part of the case body and crosses one end opening of the case main body in the radial direction, and is formed on the case end face plate side by the annular flat surface part and the crossing part. A bottom wall of the case main body having an air intake opening facing the stator winding of the stator, and an exhaust opening communicating with the air intake opening through the case main body is located on the opposite side of the air intake opening. Electric blower equipped with a motor case provided on the side, a centrifugal fan attached to the rotor shaft of the rotor, and a fan cover attached to the one end opening side of the case body to cover the fan. It assumed.

In order to solve the above-mentioned problems, the invention of claim 1 provides reinforcing flanges, which are bent and formed at both side edges of the transverse portion located between the one end opening and the fan, to the fan side. It was installed upright.

In the invention of claim 1, the reinforcing flanges provided on both side edges of the crossing portion of the case end face plate which defines the wind intake opening where a part of the stator winding faces the strength of the crossing portion. Raise it to suppress vibration during operation. And, since these reinforcing flanges are bent not to face the inside of the case body but to the fan side opposite to them, the reinforcing flanges move away from the part of the stator winding, A large insulation distance can be secured between the stator winding and the stator winding. Moreover, in order to secure such an insulation distance, it is necessary to increase the axial length of the case main body so that part of the stator winding is located closer to the bottom wall side than the one end opening of the case main body. There is no.

In order to solve the same problem, the invention according to claim 2 is characterized in that the reinforcing flanges formed by bending are formed at both side edges of the transverse portion located between the one end opening and the fan. It is provided so as to be folded and overlapped on the surface of the transverse portion on the fan side.

Also in the second aspect of the present invention, the reinforcing flanges provided on both side edges of the crossing portion of the case end face plate that defines the air intake opening through which a part of the stator winding faces the strength of the crossing portion. Raise it to suppress vibration during operation. And, since these reinforcing flanges are provided not on the inside of the case main body but on the surface on the fan side opposite to them, the reinforcing flanges move away from the part of the stator winding, and these A large insulation distance can be secured between the flange and the stator winding. Moreover, in order to secure such an insulation distance, it is necessary to increase the axial length of the case main body so that part of the stator winding is located closer to the bottom wall side than the one end opening of the case main body. There is no.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 11 in FIGS. 1 to 6
Is a motor case, which is provided with a case body 12 and a case end face plate 13, both of which are press-molded products made of iron sheet metal.

Case body 1 formed of a thin iron plate
2 has a cylindrical wall 14, an annular flat surface portion 15 formed integrally with the opening edge of the cylindrical wall 14 so as to project outward, and a bottom wall 16 formed integrally with the other end of the cylindrical wall 14. It has a bottomed cylindrical shape. A bearing support portion 17 is integrally formed in the central portion of the bottom wall 16, and a fitting cylinder portion 18 formed by bending the annular flat portion 15 so as to project in the opposite direction to the bottom wall 16 is integrally formed. Is formed in.

In this first embodiment, the cylindrical wall 14
Is a large-diameter cylindrical wall portion 1 located on the side of the wind intake port 40 described later.
4b and a tapered cylindrical wall portion 14c located on the bottom wall 16 side
It has a heterogeneous structure formed from and. The tapered cylindrical wall portion 14c is continuous with the large-diameter cylindrical wall portion 14b and has a tapered shape in which the diameter gradually decreases toward the bottom wall 16. Therefore, the tapered cylindrical wall portion 14c is bent and connected to the large-diameter cylindrical wall portion 14b.

In the structure of the cylindrical wall 14 of the case body 12 as described above, the case body 12 is reinforced by the bent boundary, and the strength of the case body 12 can be improved, whereby the sheet metal constituting the case body 12 is inexpensive. It is excellent in that it can be thin. Moreover, even if the wall thickness is reduced as described above, the strength is strong, so that it is possible to suppress the vibration of the tapered cylindrical wall portion 14c during the operation of the electric blower, so that the operation noise can be reduced. In addition to the fact that the case body 12 can be made of thin sheet metal as described above, the area of the bottom wall 16 of the case body 12 can be reduced by providing the tapered cylindrical wall portion 14c. The amount of material used to form the can be reduced. Therefore, the material cost of the case main body 12 is reduced and also lightened, and further, the overall weight and cost of the electric blower can be reduced.

The tapered cylindrical wall portion 14c on the side of the bottom wall 16 is located on the downstream side of a first air passage 26 and a second air passage 27, which will be described later, and a plurality of, for example, four exhaust ports are provided in this wall portion 14c. 19
Are drilled. As shown in FIG. 2, the bottom wall 16 is provided with a pair of exhaust ports 16a. The exhaust port 16a is also used as a positioning hole that is fitted to a protrusion of a jig (not shown) used when automatically assembling the electric blower.

As shown in FIGS. 3 to 6, the case body 1
2 includes a rotor 22 with a stator 20 and a commutator 21.
And a pair of brush devices 23 are attached, and these and the motor case 11 form an electric motor unit.

The stator 20 is formed of a stator core 24 having a substantially rectangular outer shape and a pair of stator windings 25 wound around the core 24. A part of the stator winding 25 projects toward the fan 36, which will be described later, from the annular flat surface portion 15. The stator 20 is press-fitted into the case main body 12 through the one end opening, and the stator core 24
Are fixed in the case body 12 by bringing the four corners thereof into close contact with the inner surface of the large-diameter cylindrical wall portion 14b of the cylindrical wall 14.

When the stator 20 is housed in the case body 12, the stator 20 has the insertion end surfaces of the four corners of the stator core 24 (the lower surface 24a of the stator core 24 in the insertion posture).
The surfaces located at the above four corners) are supported by hitting the bent boundaries between the large-diameter cylindrical wall portion 14b and the tapered cylindrical wall portion 14c, thereby being positioned at the regular mounting position. Therefore, when the case body 12 is drawn, the boundary used as a positioning stopper is formed at the same time. The stator 20 housed in the case body 12 is fixed by a rotation stopping means (not shown) so as not to rotate along the inner circumference of the case body 12.

The outer surface of the stator core 24 of the stator 20 thus housed and fixed in the case body 12 and the large-diameter cylindrical wall portion 1
A pair of first air passages 26 and second air passages 27 are respectively formed between the inner surface of 4b and the inner surface of 4b, as shown in FIGS. The pair of first air passages 26 are provided on both sides of the fixed iron core 24 with the fixed iron core 24 interposed therebetween. These first wind path 2
The pair of second air passages 27 adjacent to 6 are provided on both sides of the first air passage 26 at positions different from the first air passage 26 with the stator core 24 interposed therebetween. Each of these air passages 26 and 27 forms an air passage in the case that connects an air intake port (to be described later) and the exhaust ports 19 and 16a.

The rotor 22 as shown in FIGS.
Is provided with a rotor shaft 28 and the commutator 21 is attached to the shaft 28. The rotor 22 includes bearings 29,
It is rotatably supported by 30, and is arranged inside the stator 20 with its commutator 21 being moved toward the bottom wall 16 side.
The bearing 29 is built in the bearing support portion 17 of the bottom wall 16, and the bearing 30 is built in the bearing support portion 31 provided at the center of the case end face plate 13.

As shown in FIG. 3, a pair of brush devices 2
3, a cylindrical metal brush holder 23b is attached to a synthetic resin holder insulation 23a, a conductive plate 23c that also serves as a cap of the holder 23b is attached, and a carbon brush 23d and the brush 23d are attached to the brush holder 23b. The coil springs 23e for urging so as to push out are housed respectively, and the carbon brush 23d and the conductive plate 23c are electrically connected by a pigtail 23f.

The brush device 23 faces the one of the first and second air passages 26 and 27, for example, the first air passage 26, and is located on the downstream side of these air passages 26. They are attached to the cylindrical wall portion 14c so as to penetrate from the outside thereof. Thus, the brush device 23 is screwed to the tapered cylindrical wall portion 14c, whereby the coil spring 2
The carbon brush 23d, which is biased by the spring force of 3e, is provided with its tip end surface pressed against the outer peripheral surface of the commutator 21, and is attached to the stator 20 to which the end portion of the stator winding 25 is connected. The conductive plate 23c elastically contacts the connection terminal 20a, so that the connection terminal 20a and the conductive plate 23
c is electrically connected.

As described above, the brush holder 23 has the structure in which the brush device 23 is mounted through the tapered cylindrical wall portion 14c.
It is advantageous in that the temperature rise of the carbon brush 23d can be suppressed by applying more wind to the portion of the holder 3b protruding from the holder insulation 23a to the commutator 21 side, and the supporting area of the brush device 23 increases. Not only in the position near the center of gravity of the brush device 23
Is advantageous in that the brush device 23 can be stably supported by the case body 12.

The rotor shaft 28 includes a bearing 30 and a bearing support portion 3.
1, and a fan 36 made of sheet metal is attached to the tip end thereof via a nut 35. The fan 36 is a centrifugal fan. As shown in FIGS. 3 to 5, the fan 36 is formed by connecting a base plate 36a and a front plate 36b with a large number of blades 36c.
An air inlet 37 is provided at the center of b, and air outlets 36d for air formed adjacent to each other are formed on the entire circumferential surface so as to be partitioned by the above-mentioned constituent members.

A rectifying plate 32 made of synthetic resin is arranged between the fan 36 and the annular flat surface portion 15 of the case body 12 so as to cover one end opening of the case body 12. Current plate 3
Reference numeral 2 has the same outer diameter dimension as the inner diameter dimension of the fitting tubular portion 18, is closely fitted in the fitting tubular portion 18, and is attached such that the peripheral portion thereof is abutted and supported by the annular flat surface portion 15. ing. Since the fitting tubular portion 18 holds the flow straightening plate 32 in this manner, it is possible to eliminate the need for special means for fixing the flow straightening plate 32 to the annular flat surface portion 15. The center portion of the current plate 32 is screwed to the case end face plate 13.

As shown in FIGS. 3, 4 and 8 to 11, the straightening vane 32 has a plurality of air inlets 33 provided at equal intervals in the peripheral portion thereof and a plurality of straightening vanes bent inward in an arc shape. It is formed by providing blades 34. Between the adjacent straightening vanes 34, straightening air passages 34a communicating with the wind inlet 33, respectively.
Are formed. A protruding portion of the stator winding 25, which has passed through an air intake port 40 described later, is inserted into the rectifying air passage 34a of the rectifying plate 32.

As shown in FIG. 1, the fan 36 and the current plate 32 are covered with a fan cover 38 made of an iron sheet metal drawn product, and the cover 38 is fitted into the fitting cylinder portion 18.
Is fitted and attached. An air guide port 39 is formed in the center of the fan cover 38 to enter the intake port 37.

As shown in FIGS. 5 to 7, the case end plate 13 made of sheet metal is provided with a transverse portion 13a and has a planar shape, for example, a band shape. A bearing support portion 31 that internally houses and supports the bearing 30 is integrally formed at the center of the transverse portion 13a. The crossing portion 13a provided 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 body 12 in the radial direction, and both end portions thereof are provided. 13b is fixedly attached to the annular flat surface portion 15.

By such attachment, the transverse portion 13a is arranged so as to face the second air passage 27. As a result, the motor case 11 includes the transverse portion 13 of the case end plate 13.
A pair of air intakes 40 partitioned into a substantially fan shape by a and the annular flat surface portion 15 of the case body 12 (see FIGS. 4 and 5).
Are formed. Further, as shown in FIGS. 4 and 7B, the transverse portion 13a is separated from the central portion where the bearing support portion 31 is provided, and the central portion is gradually separated from the one end opening of the case body 12 toward the fan 36 side. As described above, it is bent in a substantially C-shape, thereby facilitating the intake of air into the air intake 40. The pair of wind intakes 40 are provided on both sides of the crossing portion 13a with the crossing portion 13a interposed therebetween, and have a larger air passage cross-sectional area than the second air passage 27.
We are facing 6.

Reinforcing flanges 13c are bent on both side edges of the crossing portion 13a. These flanges 13
As shown in FIGS. 3 and 5, c is provided upright on the fan 36 side. Thus, the crossing part 13
The configuration in which the reinforcing flanges 13c that are bent at a right angle to the fan-side surface of a and are provided upright are excellent in that the press work for providing these flanges 13c is simple.

In order to escape these reinforcing flanges 13c, as shown in FIG. 8, in the portion of the current plate 32 that intersects the reinforcing flanges 13c of the flow regulating vanes 34, the escape grooves 34b corresponding to the rising height of the reinforcing flanges 13c. Is provided. Then, the case end face plate 13 is provided with the reinforcing flange 13c as shown in FIGS.
It is fitted in the escape groove 34b and is installed inside the surface of the rectifying plate 32 on the one end opening side of the case body 12.

The case end face plate 13 whose main part is the transverse portion 13a is small and requires a small material cost, and is particularly excellent in that it can be made light. However, in the present invention, instead, an annular flat surface is used. A ring-shaped annular portion overlapping the portion 15,
A case end plate having a configuration of a transverse portion that crosses this in the radial direction and a pair of wind inlets 40 between the annular flat portion 15 is used, and both side edges of the transverse portion project toward the fan side. The reinforcing flange may be bent and implemented.

When the electric blower having the above-mentioned structure 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. 3 and FIG. 4 is performed. The arrow in FIG. 5 indicates the turning direction of the wind provided by the fan 36.

In this air blowing action, the air discharged from the fan 36 and flowing into the inside of the straightening vane 32 from the wind inlet 33 of the straightening vane 32 is rectified while passing through the straightening air passage 34a, and from the dynamic pressure to the static pressure. Be converted. And the rectified wind is
The air flows into the one end opening of the case body 12 facing the rectifying air passage 34a through the air intake port 40. The wind thus taken into the motor case 11 passes through the first and second air passages 26 and 27, which are the air passages in the case, and the air passage formed by the gap between the stator 20 and the rotor 22. Case body 12
After the stator 20 and the rotor 22 are circulated to the bottom wall 16 side while cooling, the brush device 23 arranged on the downstream side of the air passages 26, 27 and the like flows while being cooled, and the case body 12 Exhaust ports 19 and 16 provided on the bottom wall 16 side of the
It is discharged to the outside of the motor case 11 through a. The suction airflow of the vacuum cleaner is formed by such a blowing action.

Further, according to the electric blower having the above-mentioned structure, the reinforcing flanges 13c are respectively provided at the side edges of the transverse portion 13a of the sheet metal case end plate 13 of the motor case 11 by bending. The strength of the case end face plate 13 can be increased by these flanges 13c. Thereby, the vibration of the case end face plate 13 during the operation of the electric blower can be suppressed, and accordingly, the operation noise due to the resonance caused by the vibration in the electric vacuum cleaner including the electric blower can be reduced.

Since the reinforcing flanges 13c are provided not on the inside of the case main body 12 but on the fan 36 side opposite thereto, the reinforcing flanges 13c are provided.
Can be kept away from a part of the stator winding 25 that is passed through the wind inlet 40, and a large insulation distance G (see FIG. 3) between the case end face plate 13 and a part of the stator winding 25 can be secured. . The insulation distance G is defined at the bent base end of the flange 13c regardless of the width of the reinforcing flange 13c (standing height).

Therefore, when changing the winding specifications of the stator winding 25 according to the application, even when the number of windings of the winding 25 is increased or a stator winding having a large wire diameter is adopted, It is possible to cope with various changes in the winding specifications while ensuring the necessary insulation distance G between the case end face plate 13 and a part of the stator winding 25.

In the first embodiment,
A part of the stator winding 25 passes through the air intake 40, and that part enters the rectifying air passage 34a and is arranged on the upstream side of the wind with respect to the case end face plate 13. In this portion, the stator winding 25 has a good cooling property, and accordingly, the copper loss of the stator winding 25 is reduced, so that the performance of the electric blower can be improved. Case end face plate 1 without passing through the winding 25
Even when the entire stator winding 25 is arranged on the downstream side of the wind with respect to No. 3, the adaptability to changes in winding specifications can be similarly improved.

Moreover, in order to secure the large insulation distance G as described above, the axial length of the case main body 12 is increased so that a part of the stator winding 25 is located at one end of the case main body 12. It is not necessary to design so as to approach the bottom wall 16 side. Therefore, it is possible to enhance the adaptability to the change of the winding specification without increasing the size of the motor case 11 and hence the electric blower as a whole.

12 to 16 show a second embodiment of the present invention. The second embodiment is different from the first embodiment in the structure of bending the reinforcing flange on the case end face plate, and other structures are shown in FIGS.
The configuration is the same as or similar to that of the electric blower for the electric vacuum cleaner of the first embodiment shown in FIGS. 1 to 11 including a portion not shown in FIG. Therefore, for configurations not shown, FIGS. 1 to 11 are used as substitutes, and the same or similar components shown are denoted by the same reference numerals as those in the first embodiment to explain the configurations and The description of the action and effect based on the above will be omitted, but the same or similar components will also be described in the second section.
Is a part of the configuration of the electric blower according to the embodiment.

In the second embodiment, FIGS. 12 to 1 are used.
As shown in FIG. 6, the reinforcing flanges 13c, which are bent on both side edges of the case end face plate 13, are formed by being folded on the surface of the transverse portion 13a on the fan 16 side. The configuration other than the above points is the same as that of the electric blower according to the first embodiment.

Therefore, also in the electric blower according to the second embodiment, the problem of the present invention can be solved by the same operation as that of the electric blower according to the first embodiment.

Moreover, in the structure in which the reinforcing flange 13c is provided by folding it as described above, the case end face plate 13
It is possible to minimize the height dimension B (see FIG. 14) on both sides of the.
Therefore, in the state of being fitted and combined inside the straightening vane 32, the crossing flange portion (indicated by 13c1 in FIGS. 15 and 16) intersecting so as to cross the straightening air passage 34a of the reinforcing flange 13c. Since the height is low, it is possible to minimize the resistance of the cross flange portion 13c1 to the wind that flows through the rectifying air passage 34a. Therefore, the case end plate 1
It is superior to the electric blower according to the first embodiment in that wind loss from 3 can be reduced and the air from the fan 36 can be rectified and introduced into the air intake 40. Further, the configuration in which the reinforcing flange 13c is folded and provided is also excellent in that when the case end face plate 13 is handled by hand, it is possible to extremely reduce the risk of finger injury at the edge of the reinforcing flange 13c.

The present invention is not limited to the electric blowers according to the above-described embodiments, and is also applicable to, for example, a multi-stage electric blower in which a plurality of fans and straightening vanes are alternately attached to the rotor shaft. In addition, it can be carried out without the flow straightening plate, and can be applied to various blowers other than those for electric vacuum cleaners. The present invention can also be applied to an electric blower that employs a brushless motor in the electric motor section.

[0050]

The present invention is embodied in the form described above and has the following effects.

According to the electric blower of the first aspect of the present invention, the transverse flange positioned between the one end opening of the case body and the fan is provided with the reinforcing flanges bent and provided on both side edges of the transverse portion of the case end face plate. The strength of the part can be increased to suppress vibration during operation, and these reinforcing flanges are installed upright on the fan side, and between the reinforcing flange and the part of the stator winding facing the air intake port. Since the insulation distance is increased, it is possible to improve the adaptability to changes in the winding specifications of the stator winding, and for that purpose, the axial length of the case body is lengthened and a part of the stator winding is Since it is not necessary to design the case main body to be closer to the bottom wall side with respect to the one end opening, it can be realized without increasing the size.

Similarly, in the electric blower according to the second aspect of the present invention, the reinforcing flanges are provided at both side edges of the crossing portion of the case end face plate by bending, and are positioned between the one end opening of the case body and the fan. The vibration at the time of operation can be suppressed by increasing the strength of the crossing part that is crossed, and these reinforcing flanges are provided by folding them on the fan side surface of the case end plate, and the stator winding facing the reinforcing flange and the air intake port. Since the insulation distance from a part of the wire is increased, it is possible to improve the adaptability to changing the winding specifications of the stator winding, and for that purpose, the axial length of the case body is lengthened,
Since it is not necessary to design a part of the stator winding toward the bottom wall side with respect to the one end opening of the case body, it can be realized without increasing the size.

[Brief description of drawings]

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

FIG. 2 is an arrow view showing the electric blower according to the first embodiment as seen from the direction of arrow U in FIG.

FIG. 3 is a cross-sectional view showing the overall configuration of the electric blower according to the first embodiment.

FIG. 4 is a sectional view taken along line ZZ in FIG.

FIG. 5 is an exploded perspective view showing the configuration of the entire electric blower according to the first embodiment.

FIG. 6 is a perspective view showing a configuration of an electric motor unit of the electric blower according to the first embodiment.

FIG. 7A is a plan view showing a configuration of a case end face plate included in the electric blower according to the first embodiment. FIG. 3B is a side view showing the configuration of the case end face plate.

FIG. 8 is a rear view showing the configuration of the current plate provided in the electric blower according to the first embodiment.

9 is a rear view showing a state in which the case end face plate shown in FIG. 7 is combined with the current plate shown in FIG.

10 is a sectional view taken along line YY in FIG.

FIG. 11 is a sectional view taken along line XX in FIG.

FIG. 12 is a perspective view showing a configuration of an electric motor unit of an electric blower according to a second embodiment of the present invention.

FIG. 13A is a plan view showing a configuration of a case end face plate included in the electric blower according to the second embodiment. FIG. 3B is a side view showing the configuration of the case end face plate.

FIG. 14 is a cross-sectional view taken along line WW in FIG.

FIG. 15 is a rear view showing a state in which the case end face plate shown in FIG. 13 is combined with the current plate provided in the electric blower according to the second embodiment.

16 is a sectional view taken along line VV in FIG.

FIG. 17 is a cross-sectional view showing a configuration of an electric blower according to a conventional example.

FIG. 18 is a perspective view showing a configuration of an electric motor unit of an electric blower according to a conventional example.

FIG. 19A is a side view showing a configuration of a case end plate included in the electric blower according to the conventional example. FIG. 6B is a rear view showing the configuration of the end plate of the case.

FIG. 20 is a rear view showing a state in which the case end face plate shown in FIG. 19 is combined with the current plate provided in the electric blower according to the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Motor case, 12 ... Case main body, 13 ... Case end face plate, 13a ... Transverse part of case end face plate, 13c ... Reinforcing flange of case end face plate, 15 ... Annular flat part of case main body, 16 ... Bottom wall of case main body , 16a, 19 ... Exhaust port, 20 ... Stator, 22 ... Rotor, 25 ... Stator winding, 28 ... Rotor shaft, 36 ... Fan, 38 ... Fan cover, 40 ... Air intake port.

Claims (2)

[Claims] 1. A bottomed cylindrical case main body in which a stator and a rotor are housed and an annular flat surface extending outward at one opening edge is formed, and the case main body attached to the annular flat surface. Has a case end face plate having a transverse portion that traverses the one end opening in the radial direction, and the stator winding of the stator is formed on the case end face plate side by the annular flat portion and the transverse portion. A motor case provided on the bottom wall side of the case main body, which has an air intake opening through which the line faces, and an exhaust opening communicating with the wind intake opening through the case main body is located on the side opposite to the wind intake opening. An electric blower comprising: a centrifugal fan attached to a rotor shaft of the rotor; and a fan cover attached to the one end opening side of the case main body to cover the fan, Serial fan and an electric blower, characterized in that the reinforcing flanges are respectively bent formed on both side edges of the transverse portion is provided by standing on the fan side which is located between the. 2. A bottomed cylindrical case body in which a stator and a rotor are housed, and an annular flat surface portion that extends outward at an opening edge is formed, and the case body that is attached to the annular flat surface portion. Has a case end face plate having a transverse portion that traverses the one end opening in the radial direction, and the stator winding of the stator is formed on the case end face plate side by the annular flat portion and the transverse portion. A motor case provided on the bottom wall side of the case main body, which has an air intake opening through which the line faces, and an exhaust opening communicating with the wind intake opening through the case main body is located on the side opposite to the wind intake opening. An electric blower comprising: a centrifugal fan attached to a rotor shaft of the rotor; and a fan cover attached to the one end opening side of the case main body to cover the fan, Serial said reinforcing flanges are respectively bent formed on both side edges of the transverse portion, the electric blower, characterized in that provided in folded on the fan side of the plane of said transverse portion which is positioned between the fan.