JP3188188B2 - Electric blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower, and more particularly to dust prevention inside a stator or a bearing.

[0002]

2. Description of the Related Art Conventionally, in an electric blower used for an electric vacuum cleaner, for example, a suction air stream containing dust is sucked through a floor brush or the like during use, and the dust contained in the suction air stream is collected. After being filtered by a dust filter, the air is exhausted to the outside through the inside of the electric blower, that is, through the inside of the electric motor. Since the dust contained in the suction airflow is captured by the filter, the suction airflow passing through the electric blower does not include large dust, but extremely fine fine dust passes through the filter. Therefore, the suction airflow containing the fine dust passes through the electric motor of the electric blower, that is, the inside of the frame.

When a suction airflow containing fine dust passes through the inside of the electric motor, the fine dust adheres to the outer peripheral surface of the rotor and the magnetic pole surface of the stator facing the outer peripheral surface during long-term use. However, this has an adverse effect on motor performance because the gap between the outer peripheral surface of the rotor and the magnetic pole surface of the stator facing the outer peripheral surface is extremely small. In addition, fine dust adheres to a bearing such as a ball bearing which supports the rotating shaft of the rotor over a long period of use, and the performance of the bearing is deteriorated to hinder smooth rotation of the rotor. Further, when a DC motor using a commutator is used as the motor, fine dust adheres to the commutator, the commutator brush, and the like, thereby hindering good commutation. Further, when a brushless motor using a transistor is used, the printed wiring board on which the electronic components constituting the drive circuit are mounted is disposed near the stator, so that fine dust is not applied to these circuit components and the like. Adhesion may cause short-circuiting.

[0004] As described above, when the suction airflow containing fine dust flows into the motor, there is a problem that the performance of the motor is reduced, the durability is lost, and in some cases, a failure occurs.

To solve such a problem, there is one disclosed in Japanese Utility Model Laid-Open No. 5-70183, which has already been filed by the applicant. What is described in this publication is, as described in the detailed description of the invention in the publication and in the drawings, one end of a dustproof wall formed of a synthetic resin in a cylindrical shape is attached to the end face of the stator core. The other end is formed in an air-tight manner by an O (O) ring on each of the holder portions formed on the casing and the bracket and on which the bearing is mounted, and the bearing, rotor, stator and the like are shielded by the dustproof wall, that is, blown by the blower fan. Separated from the air path, foreign matter in the air can
This is to prevent adhesion to a stator or the like.

[0006] As described above, in the configuration described in the above publication, in which the suction airflow is prevented from flowing into the inside of the dust-proof wall or the like, the number of parts is large because the dust-proof wall and the O-ring are used. However, since the number of parts is large, the number of assembly steps is increased, which is not preferable in terms of productivity. Also,
Since the diameter of the O-ring cannot be too large because of the relationship with the thickness of the dust-proof wall, the amount of distortion is small, and the axial dimensions of the components, that is, the dust-proof wall, the dimensions of the casing and the bracket, and the stacked stator There is a problem that it is not possible to absorb variations in the axial direction such as the lamination dimensions of the core, and as a result, it is not possible to maintain good airtightness and to reliably prevent dust.

[0007]

As described above, the dustproof construction of the conventional electric blower for preventing the suction airflow from flowing into the inside of the motor, that is, the inside of the dustproof wall, has a large number of components and a large number of parts. However, there is a problem that the number of man-hours increases and the productivity is deteriorated due to the large number of components.Moreover, since the amount of distortion of the O-ring is small, variations in the axial dimension when assembling the components cannot be completely absorbed. There is a problem that it is not possible to effectively prevent dust.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the invention according to claim 1 has a cylindrical shape inside a motor frame of an electric blower including a fan and an electric motor. A dustproof cover is provided by bringing one end of the dustproof cover into contact with the stator of the electric motor and the other end of the dustproof cover by contacting the other end with the peripheral edge of a bearing housing portion provided on the frame. In the electric blower in which dust is prevented by preventing the dust from flowing into the first dustproof member, the dustproof cover is formed in a large-diameter cylindrical shape, and a small-diameter cylindrical shape is formed.
A second dustproof member formed in the first and second dustproof portions
Composed of a disc-shaped member that is integrally provided with the material
An elastic rubber cover body,
There is a through hole in the center that is approximately the same size as the through hole of the dustproof member.
Constituted by a compression force reinforcing member, and the first
Formed near the connection between the dustproof member and the disc-shaped member
The outer peripheral edge of the compressive force reinforcing member is fitted into the fitting groove,
The compressive force strengthening member is provided on the back surface of the disc-shaped member.
In addition, an electric blower in which an end of the first dustproof member is in contact with the stator and an end of the second dustproof member is in contact with the peripheral edge of the bearing housing portion.

According to the first aspect of the present invention, even if the axial dimension of the dust-proof cover, the laminated dimension of the laminated core, the dimension of the frame, and the like vary, these variations are elastically deformed. While being absorbed by the dustproof member and the second dustproof member, the first dustproof member and the end face of the stator and the second dustproof member and the peripheral edge of the bearing housing portion are compressed by the compressive force enhanced by the compressive force reinforcing member. This has the effect of improving the airtightness and reliably preventing the suction airflow from flowing into the inside of the dustproof cover.

[0010]

[0011]

[0012]

[0013]

The invention according to claim 2 is the same as the invention according to claim 1.
An electric blower provided with a protection member for protecting a lead wire in the dustproof cover according to the above invention.

According to the second aspect of the present invention, in addition to the function of the first aspect of the present invention, since the dust-proof cover is provided with a protective member for protecting the lead wire, the dust-proof cover is provided inside the dust-proof cover. This has the effect of preventing inflow of the suction airflow and facilitating assembly.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view of an electric blower A. As shown in FIG.
And a fan 50 attached to the fan. In this embodiment, the motor 1 uses a so-called brushless motor driven by a drive circuit using a transistor or the like. The electric motor 1 includes a frame 2, a stator 30, a rotor 40, and the like.

The frame 2 is a main frame 10
And a sub-frame 20 attached to the main frame 10 with the attachment screws 3. The main frame 10 is formed in a bottomed cylindrical shape having an opening 11 at one end, and the bottom wall 12 has the opening 11.
A bearing housing 13 is formed in a concave shape that is open to the side, and a bottom wall 1 is formed on the periphery of the opening of the bearing housing 13.
An annular raised portion 13a, which is a peripheral portion of the raised portion 2, is formed. An exhaust hole 14a is formed in the peripheral wall 14 located on the bottom wall 12 side. A flange 15 having a fitting portion 15a for fitting and attaching a fan cover, which will be described later, is formed integrally with a peripheral portion of the opening 11, and a screw hole 15b is provided in the flange portion 15. I have.

Next, the sub-frame 20 is formed in a substantially rectangular shape as shown in FIG. 2, and has a central portion on one side, that is, on the side facing the bottom wall 12 of the main frame 10 as shown in FIG. A bearing housing portion 21 is formed which is opened and recessed toward the other side so as to be formed in a concave shape, and the periphery of the opening of the bearing housing portion 21 is an annular raised portion 21 which is a peripheral portion.
a is formed. Vent holes 22 are formed on both sides of the bearing housing 21, and screw holes 23 and screw insertion holes 24 are formed near and at both ends of the annular protrusion 21a. Then, the screw insertion holes 24 formed at the both end portions and the flange portions 15 of the main frame 10 are formed.
The sub-frame 20 and the main frame 10 are joined by inserting the screw 3 in correspondence with the screw holes 15b formed in
In a state where both are joined, the sub-frame 20 is bridged at the center of the circular opening 11 of the main frame 10, and on both sides of the sub-frame 20, both side edges of the sub-frame 20 and the periphery of the opening 11. A substantially semicircular air path opening is formed. Also, as a matter of course, when the main frame 10 and the sub-frame 20 are connected to each other, the axes of the bearing storage portions 13 and 21 provided on the main frame 10 and the sub-frame 20 are the same.

Next, the stator 30 that is press-fitted into the main frame 10 and attached will be described. This stator 3
Reference numeral 0 denotes a laminated core 31 formed by laminating a plurality of cores 32 formed by punching a silicon steel plate or the like so as to have a predetermined lamination size, and a slot insulating material 34 disposed in a slot 32b described later. As shown in FIG. 3, a predetermined number (six in the figure) of magnetic poles 32a are formed on the iron core 32, and the magnetic poles 32a are provided between adjacent magnetic poles 32a.
The aforementioned slot 32b for winding the stator winding 33 is formed in 2a. A press-fit portion 32 press-fitted into the peripheral wall 14 of the main frame 10 is provided on the outer periphery of the iron core 32.
When the press-fit portion 32c is pressed into the peripheral wall 14, the press-fit portions 32 adjacent to each other are formed.
A space is formed surrounded by c and the peripheral wall 14, and this space forms an air passage between the outer periphery of the stator 30 and the inner periphery of the main frame 10. As shown in FIG. 4, a slot insulating material 34 made of a synthetic resin is disposed in the laminated core 31, that is, each of the slots 32 b of the stator 30. An annular wall 35 is formed integrally with the stator 30 and protrudes from both end faces of the stator 30 in a direction perpendicular to the end face, that is, in the axial direction.
A plurality of protrusions 37 are formed at positions corresponding to the respective magnetic poles 32a while being spaced apart from and facing the magnetic poles 5a. The projection 37 and the annular wall 35 define the stator winding 3 between them.
3 is formed. Further, a sensor housing 39 formed in a groove shape is formed on the protrusion 37 located on the bottom wall 12 side. The number of the sensor housings 39 provided is determined by the number of phases of the electric motor 1. The slot insulating material 34
The annular wall 35 and the projection 37 may be molded in advance with a heat-resistant synthetic resin and attached to the laminated core 31, or may be formed integrally with the laminated core 31.

The stator 30 is connected to the stator winding 33.
Is press-fitted into the main frame 10 in a wound state.

Next, the rotor 40 has a predetermined pole attached to the outer periphery of a laminated core 43 formed by laminating a plurality of iron cores 42 formed by punching a silicon steel plate or the like so as to have a predetermined lamination size. A plurality of permanent magnets 44 and the iron core 4
The rotary shaft 45 is press-fitted into the third shaft hole 43a. A screw 45a for attaching a centrifugal fan 51 described later is formed at one end of the rotating shaft 45. Further, ball bearings 46 and 47 as bearings are mounted on the rotary shaft 45 by press-fitting inner rings thereof.

The rotor 40 is provided with ball bearings 46 and 47 on a rotating shaft 45 with the main frame 10 and the sub-frame 2.
The outer ring is rotatably supported and disposed in the frame 2 by holding or fitting the outer ring in the bearing storage portions 13 and 21 formed in each of the reference numerals 0 and 2.

Next, the fan 50 will be described. The fan 50 includes a centrifugal fan 51, a rectifying plate 55, and a fan cover 56 that houses the centrifugal fan 51 and the rectifying plate 55. And the centrifugal fan 5
Numeral 1 is the same as the conventionally known one. In other words, a circular flat plate plate 52, a gently curved mountain-shaped curved plate 53 provided with a suction port 53b at the center, and the flat plate plate 52 and the curved plate 53
Blades 54 that connect the plurality of blades at a predetermined distance from each other
It is composed of A through hole 52a is formed in the center of the flat plate 52. The rectifying plate 55 has a plurality of air passage openings (not shown) formed in an outer peripheral portion thereof, and a circular concave portion 55 formed in a central portion.
a is formed, and the sub-frame 20 is
A fitting hole 55b that fits into the outer peripheral portion of the bearing housing portion 21 is formed. In the recess 55a, a through-hole 55c corresponding to the screw hole 23 formed in the sub-frame 20 is formed. Further, the fan cover 56 is formed in a cylindrical shape having a bottom opening at the bottom in the figure, and the bottom wall, that is, the surface facing the curved plate 53 is formed in a shape along the curved surface of the curved plate 53. A suction port 56a is formed at a central portion thereof in correspondence with a suction port 53b formed in the curved plate 53, and an annular wall 56b is formed.
The inner peripheral wall in the vicinity of the opening is a fitting portion fitted to a fitting portion 15a formed on the flange portion 15 formed on the main frame 10.

The fan 50 is mounted in a state where the electric motor 1 is assembled. That is, the sub-frame 2 in a state where the electric motor 1 is assembled
First, the current plate 55 is disposed with its through hole 55c corresponding to the screw hole 23 of the sub-frame 20, and the screw 4 is fastened to the screw hole 23 and attached. Then, the centrifugal fan 51 is attached to the screw 45a of the rotary shaft 45 via a washer 58 with a flat plate 52 sandwiched between mounting plates 57, 57 and a nut 59. Then, the fan cover 56 is attached to the centrifugal fan 51 and the rectifying plate 5.
5, and the fitting part is fitted and fitted to the fitting part 15a.

Next, both ends of the stator 30 and the peripheral edges of the bearing housings 13 and 21, that is, the annular raised portions 13a,
The dustproof covers 60 and 70 provided between the both ends of the stator 30 and the bearing housings 13 and 21 with their ends in close contact with 21a are shown in FIGS.
It will be described based on. First, the stator 30 and the sub-frame 2
0 dust-proof cover 60 provided between the bearing housing 21
Will be described.

The dust-proof cover 60 is made of an elastic rubber or the like, and has a large-diameter cylindrical portion 61 as a first dust-proof member and a small-diameter cylindrical portion 6 as a second dust-proof member as shown in FIG.
5. A cover body 6 comprising a disc-shaped member 67 integrally provided by connecting the large-diameter cylindrical portion 61 and the small-diameter cylindrical portion 65.
0a and FIG. 6 provided so as to overlap the disc-shaped member 67.
And a compressive force reinforcing member 68 shown in FIG. A fitting groove 63 is formed in the vicinity of the connection between the large-diameter cylindrical portion 61 and the disc-shaped member 67 by forming an annular rib 62 having a diameter smaller than the inner diameter of the large-diameter cylindrical portion 61. . An inner peripheral wall of the large-diameter cylindrical portion 61 below the annular rib 62 is airtightly fitted to an outer periphery of an annular wall 35 formed integrally with a slot insulating member 34 provided on the stator 30. A fitting portion 64 is provided. In the figure of the small-diameter cylindrical portion 65, a fitting step 66 is formed at the upper edge, and the fitting step 66 is air-tight with an annular ridge 21a formed around the opening of the bearing housing 21. Is to be fitted.

The fitting groove 63 formed in the large-diameter cylindrical portion 61 has a compressive-force reinforcing member 6 made of a hardly deformable member made of a cardboard or a thin plate made of a synthetic resin plate or the like.
8 is attached by fitting its outer peripheral edge. This compressive force reinforcing member 68 is formed in a disk shape as shown in FIG.
A through hole 68a having substantially the same size as a is formed. The compressive force reinforcing member 68 is provided so as to overlap the disk-shaped member 67, that is, by being interposed between the large-diameter cylindrical portion 61 and the small-diameter cylindrical portion 65, the fitting step 66 of the small-diameter cylindrical portion 65 is provided.
It is possible to increase the compressive force of pressing against the annular raised portion 21a, that is, to reinforce it.

Next, the reason why the compression force can be increased, that is, the reinforcement can be performed by interposing the compression force reinforcing member 68 between the large-diameter cylindrical portion 61 and the small-diameter cylindrical portion 65 will be described.

When the fan 50 rotates, a pressure difference is generated in the frame 2 by the centrifugal fan 51. Further, since the cover body 60a is formed of elastic rubber or the like and the area of the disc-shaped member 67 is large, the disc-shaped member 67 has a direction perpendicular to the disc surface, that is, a vertical direction in FIG. Therefore, when a pressure, that is, a force caused by the pressure difference is applied, the disc-shaped member 67 is easily dented and deformed even if the force is small. That is, the compressive force for pressing the fitting step portion 66 against the annular protruding portion 21a is weak, and sufficient airtightness cannot be obtained.

However, when the compressive force reinforcing member 68 is superimposed on the disk-shaped member 67, the compressive force reinforcing member 68 exists even if a force perpendicular to the disk surface is applied to the disk-shaped member 67. Therefore, deformation in a direction perpendicular to the disk surface is prevented. As a result, the compressive force applied to press the annular raised portion 21a of the fitting step 66 of the small-diameter cylindrical portion 65 is increased. Therefore, the fitting step 66 and the annular raised portion 21a are pressed by a large compressive force. That is, sufficient airtightness can be obtained.

In this embodiment, the large-diameter cylindrical portion 61 and the annular wall 35 are connected to the outer peripheral surface of the annular wall 35 and the fitting portion 64 of the large-diameter cylindrical portion 61, that is, the inside of the large-diameter cylindrical portion 61. Since the peripheral wall and the peripheral wall are fitted in a compressed state, airtightness can be maintained relatively well without providing the disk-shaped member 67 with the compressive force reinforcing member 68.
And the annular wall 35 is brought into contact with the small-diameter cylindrical portion 6.
Even in the case where the surface is substantially in contact with the ring-shaped protrusion 21a as in the case of the ring-shaped protrusion 5, the compressive force can be increased by the compressive force reinforcing member 68, so that sufficient airtightness can be obtained.

The dustproof cover 60 has a small-diameter cylindrical portion 65.
Is provided, the air sucked from the outside flows into the vicinity of the bearing accommodating portion 21, so that the bearing 47 can be cooled and the temperature rise of the bearing 47 can be prevented.

Next, the dustproof cover 70 provided between the stator 30 and the bearing housing 13 of the main frame 10 will be described. The dustproof cover 70 is made of an elastic rubber or the like, and has a large-diameter cylindrical portion 71 as a first dustproof member and a small-diameter cylindrical portion 7 as a second dustproof member as shown in FIG.
5. A cover body 7 composed of a disc-shaped member 77 integrally provided by connecting the large-diameter cylindrical portion 71 and the small-diameter cylindrical portion 75.
0a and a compressive force reinforcing member 68 provided so as to overlap the disc-shaped member 77. A fitting groove 73 is formed in the vicinity of the connection between the large-diameter cylindrical portion 71 and the disc-shaped member 77 by forming an annular wall 72 having a diameter smaller than the inner diameter of the large-diameter cylindrical portion 71. . An inner peripheral wall of the large-diameter cylindrical portion 71 below the annular wall 72 is airtightly fitted to an outer periphery of an annular wall 35 formed integrally with a slot insulating member 34 provided on the stator 30. Fitting part 74
It has become. A fitting step 76 is formed at the upper edge of the small diameter cylindrical portion 75 in the drawing.
Is to hermetically fit with an annular ridge 13a formed on the periphery of the opening of the bearing housing 13.

A compression-strengthening member 68 is fitted in the fitting groove 73 formed in the large-diameter cylindrical portion 71 in the same manner as the dust-proof cover 60 by fitting the outer peripheral edge thereof. The compressive force reinforcing member 68 is provided so as to overlap the disc-shaped member 77, that is, by being interposed between the large-diameter cylindrical portion 71 and the small-diameter cylindrical portion 75, in the same manner as in the case of the dust-proof cover 60. Fitting step 76 of small cylindrical part 75
It is possible to increase, that is, to reinforce, the compressive force of pressing against the annular raised portion 13a. Therefore, the fitting step 76 of the small-diameter cylindrical portion 75 and the annular ridge 1
Good airtightness with 3a is obtained.

The dust-proof cover 70 has a cylindrical lead wire protection member 79 having a through hole 79a formed in the outer peripheral wall of the large-diameter cylindrical portion 71, and is formed to project from the main frame. 10 protrudes from the exhaust hole 14a. A printed wiring board (to be referred to as a wiring board hereinafter) 80 to be described later is formed in a through hole 79a of the lead wire protecting member 79.
The flexible lead wire 81 and the lead wire 33a connected to the stator winding 33 are inserted through the main frame 10 and pulled out. Since the lead wire protecting member 79 is formed of an elastic member such as elastic rubber, the lead wire protecting member 79 can be freely deformed, so that the leading end thereof has a length protruding from the exhaust hole 14a of the main frame 10. Even if it is formed, it can be attached to the main frame 10 without any trouble because it bends freely when attached to the main frame 10. Also, the lead wire protection member 79 is attached to the dustproof cover 70.
Since it is formed integrally with the above, there is an advantage that the number of parts is small and the assembling is easy as compared with the case where another protective tube is used as in the related art.

The annular wall 3 formed on the slot insulating member 34 and located on the bottom wall 12 side of the main frame 10.
5, a wiring board 80 is mounted. On the wiring board 80, various electronic components 82 constituting a driving circuit are mounted on the surface on the bottom wall 12 side in FIG.
A Hall IC, which is one of the electronic components of a drive circuit for detecting the rotational position of the rotor 40, is provided on the surface on the side of the stator 30.
Is attached. The sensor 83 is provided in the sensor housing 39 formed on the protrusion 37.
It is housed and arranged. The wiring board 80
Is attached to the annular wall 35 by forming a through hole (not shown) formed in the wiring board 80 and fitting the unillustrated fitting projection formed on the annular wall 35 into the through hole. It is something that has become.

Next, a method of assembling the electric blower A configured as described above will be described.

First, a stator winding 33 is attached to the laminated core 31 of the stator 30 with a slot insulating material 34 interposed therebetween.
Then, after attaching a wiring board 80 on which electronic components and the like are attached to the annular wall 35 located on the bottom wall 12 side, the dustproof cover 70 to which the compressive force reinforcing member 68 is attached is fitted to the fitting portion of the large-diameter cylindrical portion 71. 74 is fitted and attached to the annular wall 35. At this time, the lead wire 33a connected to the flexible lead wire 81 and the stator winding 33 provided on the wiring board 80 is inserted into the through hole 79a of the lead wire protection member 79. Next, the stator 30 is press-fitted into the main frame 10 and attached. The bearings 46, 4
7 is inserted into the main frame 10 from the bearing 46 side, and the bearing 46 is housed in the bearing housing 13 so that one side of the rotating shaft is mounted on the main frame 10.
Attach to Next, the dustproof cover 60 having the compressive force reinforcing member 68 attached to the annular wall 35 located at the opening 11 of the main frame 10 is fitted by fitting the fitting portion 64 of the large-diameter cylindrical portion 61, and then the sub-frame is attached. The motor 1 is mounted on the main frame 10 by screws 3.
Is assembled. And this assembled motor 1
The electric blower A is assembled by attaching the fan 50 according to the procedure described above.

In the electric blower A constructed as described above, the dustproof cover 60 is formed by an elastic member, and the large-diameter cylindrical portion 61 as the first dustproof member and the small-diameter cylindrical portion as the second dustproof member are provided. 65, a disc-shaped member 67 integrally provided by connecting the large-diameter cylindrical portion 61 and the small-diameter cylindrical portion 65
, And the compressive force reinforcing member 68 provided on the disc-shaped member 67 so that the first dust-proof member and the second dust-proof member are respectively formed on the outer periphery of the bearing housing portion 21, that is, in the annular shape. The airtightness can be improved because the compressive force for pressing against the protruding portion 21a and the end face of the stator 30, that is, the annular wall 35 can be increased. The same is true for the dustproof cover 70. In the above embodiment, the large-diameter cylindrical portion 6 of the dustproof covers 60 and 70 is used.
The ends of the large-diameter tubular portions 61 and 71 are fixed to the stator 30 by fitting the ends of the large-diameter cylindrical portions 61 and 71 to the annular wall 35.
In this case, the large-diameter cylindrical portions 61 and 71 have a strong compressive force, so that the airtightness at the end face of the stator 30 is ensured. .

Further, since the lead wire protecting member 79 formed integrally with one dustproof cover 70 is formed of an elastic member, the number of parts is smaller than that in the case where another protective tube is used as described above. It is easy to assemble with a small amount.

[0042]

[0043]

[0044]

[0045]

According to the first aspect of the present invention, even if the length of the dust-proof cover, the laminated dimension of the laminated core, the dimension of the frame, and the like vary, the variation is reduced by the first dust-proof member which is elastically deformed. While being absorbed by the second dustproof member, the airtightness between the first dustproof member and the stator side and between the second dustproof member and the outer peripheral edge of the bearing housing is increased by the compressive force increased by the compressive force reinforcing member. This has the effect that the inflow of the suction airflow into the dustproof cover can be reliably prevented.

[0046]

[0047]

[0048] The invention of claim 2, wherein, in addition to the calling <br/> light effects according to claim 1, since a protective member for protecting a lead wire to the dust cover, to the inside of the dust cover This has the effect of preventing inflow of the suction airflow and facilitating assembly.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electric blower showing an embodiment of the present invention.

FIG. 2 is a plan view of a sub-frame according to the embodiment.

FIG. 3 is a plan view of an iron core of a stator in the embodiment.

FIG. 4 is a plan view of the slot insulating material of the embodiment.

FIGS. 5A and 5B are diagrams showing one dustproof cover of the embodiment, in which FIG. 5A is a plan view and FIG. 5B is a sectional view.

FIG. 6 is a view showing a compressive force strengthening member of the embodiment,
(A) is a plan view and (B) is a sectional view.

FIGS. 7A and 7B are views showing another dustproof cover of the embodiment, in which FIG. 7A is a plan view and FIG. 7B is a sectional view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS A Electric blower 1 Motor 2 Motor frame 10 Main frame 13 Bearing storage part of main frame 13a Annular ridge of bearing storage part of main frame (outer peripheral part of bearing storage part) 20 Subframe 21 Bearing storage part of subframe 21a Sub Annular protruding portion of bearing housing portion of frame (outer peripheral portion of bearing housing portion) 30 Stator 40 Rotor 50 Fan 60, 70 Dustproof cover 60a, 70a Cover body 61, 71 Large-diameter cylindrical portion (first dustproof member) 63 , 73 Fitting groove 67, 77 Disc-shaped member 65, 75 Small-diameter cylindrical portion (second dust-proof member) 68, 78 Compressive force reinforcing member 65a, 75a Through hole

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-7-245900 (JP, A) JP-A-52-72908 (JP, A) JP-A-2-24619 (JP, A) JP-A-4- 4735 (JP, A) Japanese Utility Model Hei 5-70183 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) H02K 5/04-5/10 H02K 7/14 A47L 9/00

Claims (2)

(57) [Claims] 1. A peripheral edge of a bearing housing portion formed in a cylindrical shape inside a motor frame of an electric blower comprising a fan and an electric motor, one end of which is provided on a stator of the electric motor and the other end of which is provided on the frame. A dustproof cover is provided in contact with each part, and dust is prevented by preventing suction airflow from the fan from flowing into the inside of the dustproof cover, wherein the dustproof cover is formed in a large-diameter cylindrical shape. First dustproof part
Material, a second dustproof member formed into a small-diameter cylindrical shape,
And a disk provided integrally with the second dustproof member
The cover is made of an elastic rubber
And a through hole having substantially the same size as the through hole of the second dustproof member.
A compression-strengthening member having a hole at the center thereof , and a connecting portion between the first dustproof member and the disc-shaped member.
The outer peripheral edge of the compression-strengthening member is fitted in a fitting groove formed on the side.
To fit the compression-strengthening member to the back of the disk-shaped member.
And an end portion of the first dustproof member is brought into contact with the stator, and an end portion of the second dustproof member is brought into contact with a peripheral portion of the bearing housing portion. Blower. 2. A protection for protecting a lead wire on the dust-proof cover.
The electric blower according to claim 1, further comprising a member .