JPH09308177A - Motor-driven blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven blower which prevents fine dust from penetrating the inside of its motor. SOLUTION: In the insides of frames 10, 20 of a motor 1 of a motor-driven blower (A) comprising a fan 50 and the motor 1, dustproof covers 60, 70 are formed in the forms of cylinders. The dustproof covers 60, 70 are disposed to abut their respective one-end sides against the respective end surface sides of a stator 30 of the motor 1 and to abut their respective other-end sides respectively against the peripheral edge portions of bearing storing portions 13, 21 provided on the frames 10, 20. Thereby, the suction air flow from the fan 50 is prevented from flowing in the insides of the dustproof covers 60, 70 to perform the dustproof of the motor 1. Further, forming these dustproof covers 60, 70 out of elastic members, annular walls 35 (cylindrical screening walls) comprising heat-proof members are provided respectively on the respective end surfaces of the stator 30 to engage the respective one-end sides of the dustproof covers 60, 70 with these annular walls 35 and to separate the dustproof covers 60, 70 from the respective end surfaces of the stator 30.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, an electric blower used, for example, in an electric vacuum cleaner or the like is inhaled with a suction airflow containing dust through a floor brush or the like at the time of use, and the dust contained in the suction airflow is After being filtered by the dust collecting filter, it is exhausted to the outside through the inside of the electric blower, that is, the inside of the electric motor. In this way, since large dust contained in the suction airflow is captured by the filter, although large dust is not included in the suction airflow passing through the electric blower, extremely fine dust passes through the filter. Therefore, the suction air flow containing the fine dust passes through the inside of the electric motor of the electric blower.

When the suction air flow 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 the 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 that supports the rotary shaft of the rotor for a long period of time, which deteriorates the performance of the bearing and hinders smooth rotation of the rotor. When a DC motor using a commutator is used as the electric motor, fine dust adheres to the commutator, the commutation brush, etc., which hinders good commutation. Also, when a brushless electric motor using a transistor is used, the printed wiring board on which the electronic components that make up the drive circuit are attached is arranged in the vicinity of the stator, and therefore fine dust is generated in these circuit components. It will adhere and cause a short circuit.

As described above, when the suction airflow containing fine dust flows into the electric motor, the performance of the electric motor is deteriorated, durability is lost, and in some cases, failure occurs.

As a solution to such a problem, there is one described in Japanese Utility Model Laid-Open No. 5-70183, which has been filed by the applicant. What is described in this publication is, as described in the section of the detailed description of the invention of the publication and the drawings, one end side of a dustproof wall formed of a synthetic resin in a cylindrical shape on the end surface of the stator core, The other end is formed in a casing and a bracket on which a bearing is mounted and is provided with an O (O) ring to maintain airtightness. The dustproof wall shields the bearing, rotor, stator, etc., that is, by a blower. This is to prevent foreign matter in the air from adhering to bearings, rotors, stators, etc. by separating from the path of air to be blown.

In the structure for preventing the inflow of the suction airflow into the inside of the dustproof wall described in the above publication, first, since the dustproof wall and the O-ring are used, the number of parts is large and Since the number of points is large, the number of assembling steps is large, which is not preferable in terms of productivity. Further, since the O-ring and the dustproof wall are in contact with the stator core, it is necessary to use a material that can withstand the temperature rise of the stator core and the bearing or a heat-resistant synthetic resin. There is a problem that becomes.

[0007]

As described above, in the dustproof structure in which the inside of the electric motor of the conventional electric blower, that is, the bearing, the rotor, the stator, etc. are shielded from the suction airflow by the blower, the number of assembling steps is increased and the productivity is deteriorated. In addition, since the O-ring and the dustproof wall are in contact with the stator core, the O-ring must be made of a material that can withstand the temperature rise of the stator core and the bearing, and the dustproof wall is the stator core. Also, there is a problem that a heat-resistant synthetic resin that can withstand the temperature rise of the bearing must be used, resulting in an increase in cost.

[0008]

The present invention has been made in view of the above circumstances, and the invention according to claim 1 is formed in a tubular shape inside a frame of an electric motor of an electric blower including a fan and an electric motor. A dustproof cover is provided by bringing one end side into contact with the stator side of the electric motor and the other end side into contact with the peripheral edge of the bearing housing section provided in the frame, respectively, and the dustproof cover of the suction airflow from the fan is provided. In an electric blower that prevents inflow to the inside and is dust-proof, the dust-proof cover is formed of an elastic member, and a cylindrical shielding wall made of a heat-resistant member provided by bringing one end side into contact with the stator is provided. By making the dustproof cover abut on the other end side, the dustproof cover is separated from the stator to provide an electric blower.

According to the first aspect of the present invention thus constructed, the end face of the stator is provided with a cylindrical shielding wall made of a heat-resistant member, and one end side of the dustproof cover is fitted and attached to the shielding wall. Because of the structure, the dust cover does not require heat resistance, and the number of parts can be reduced and the cost can be reduced, and the airtightness of the dust cover can be enhanced.

According to a second aspect of the present invention, there is provided an electric blower in which the shielding wall in the first aspect of the invention is formed integrally with a slot insulating material provided on the stator. According to the invention of claim 2 configured as described above, in addition to the function of the invention of claim 1, since the shielding wall is formed integrally with the slot insulating material provided in the stator, the shielding wall is heat resistant. Since it is formed integrally with the slot insulating material having the above, it is not necessary to separately form a material having heat resistance, and it has an effect that the number of assembling steps can be reduced and the airtightness can be enhanced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION 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. 1, the electric blower A comprises an electric motor 1 and a fan 50 attached to the electric motor 1. In this embodiment, the electric motor 1 is an example in which a so-called brushless electric motor driven by a drive circuit using a transistor or the like is used. The electric motor 1 is composed of the frame 2, the stator 30, the rotor 40 and the like.

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

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 as shown in FIG. 1, that is, on the side facing the bottom wall 12 of the main frame 10. A bearing accommodating portion 21 is formed which is open and is recessed toward the other side to form a concave shape. An annular raised portion 21a, which is a peripheral edge portion, is formed at the peripheral edge of the opening of the bearing accommodating portion 21.
Are formed. Further, ventilation holes 22 are provided on both sides of the bearing housing portion 21, and screw holes 23 and screw insertion holes 2 are provided in the vicinity and both ends of the annular raised portion 21a, respectively.
4 are formed. Then, the screw 3 is inserted through the screw insertion holes 24 formed in the both ends and the screw holes 15b formed in the flange portion 15 of the main frame 10 in association with each other to connect the sub-frame 20 and the main frame 10 to each other. In the state where the sub-frame 20 and the sub-frame 20 are connected to each other, the sub-frame 20 is bridged to the center of the circular opening 11 of the main frame 10 on both sides of the sub-frame 20 and both side edges of the sub-frame 20 and the periphery of the opening 11. A substantially semi-circular air passage opening is formed.

Next, the stator 30 which is press-fitted and attached to the main frame 10 will be described. This stator 3
0 is composed of a laminated iron core 31 formed by laminating a plurality of iron cores 32 formed by punching out a silicon steel plate or the like so as to have a predetermined lamination size, and the iron core 32 has a predetermined number as shown in FIG. (6 in the figure) magnetic poles 32a are formed, and slots 32b for winding the stator winding 33 around the magnetic poles 32a are formed between the adjacent magnetic poles 32a. Further, the main frame 1 is provided on the outer periphery of the iron core 32.
The press-fitting portion 32c press-fitted into the peripheral wall 14 of 0 is formed to project. In the state where the press-fitting portion 32c is press-fitted into the peripheral wall 14, the space surrounded by the press-fitting portion 32c and the peripheral wall 14 which are adjacent to each other forms a space. The space is formed and forms an air passage between the outer circumference of the stator 30 and the inner circumference of the main frame 10. As shown in FIG. 4, the cores 32 are laminated so that the laminated cores 31, that is, the slots 32b of the stator 30, are made of a heat-resistant material, that is, a synthetic resin capable of withstanding the temperature of the stator 30 which is high when the electric motor 1 is driven. The formed slot insulating material 34 is provided. The slot insulating material 34 is integrally formed with the slot insulating material 34 and protrudes from both end surfaces of the stator 30 in a direction orthogonal to the end surface, that is, in the axial direction. And an annular wall 35 as a cylindrical shielding wall, and a plurality of protrusions 37 are formed inside the annular wall 35 so as to face the annular wall 35 at a distance from each other and to correspond to the teeth of each magnetic pole 32a. A holding groove 38 that holds the stator winding 33 is formed between the protrusion 37 and the annular wall 35. The protrusion 37 located on the side of the bottom wall 12 has a groove-shaped sensor housing portion 3.
9 is formed. The sensor storage portions 39 are provided by the number determined according to the number of phases of the electric motor 1. The slot insulation 34, the annular wall 35, and the projection 37 may be molded in advance with heat-resistant synthetic resin and attached to the laminated iron core 31,
Further, it may be formed integrally with the laminated iron core 31.

The stator 30 is the stator winding 33.
It is mounted by being press-fitted into the main frame 10 in a wound state.

Next, the rotor 40 has a laminated iron core 43 formed by laminating a plurality of iron cores 42 formed by punching out a silicon steel plate or the like so as to have a predetermined laminated dimension, and the outer periphery of the laminated iron core 43. It is composed of a permanent magnet 44 formed with a predetermined number of poles and a rotating shaft 45 press-fitted into the shaft hole 43a of the laminated iron core 43. The rotating shaft 4
A screw 45a for attaching a centrifugal fan 51, which will be described later, is formed at the tip of one end of the No. 5 side. Then, ball bearings 46 and 47 as bearings are attached to the rotary shaft 45 by press-fitting the inner rings thereof.

The rotor 40 has ball bearings 46 and 47 on a rotation shaft 45, and the main frame 10 and the sub-frame 2 are provided.
The outer races are rotatably supported and disposed in the frame 2 by storing and fitting the outer races in the bearing accommodating portions 13 and 21 which are formed in each No. 0.

Next, the fan 50 will be described. The fan 50 includes a centrifugal fan 51, a flow straightening plate 55, and a fan cover 56 that houses the centrifugal fan 51 and the flow straightening plate 55. And the centrifugal fan 5
Reference numeral 1 is a circular flat plate 52, and a suction port 53b is provided at the center.
And a flat plate plate 52 and a plurality of blades 54 that join the curved plate 53 with a predetermined distance from each other. A through hole 52a is formed at the center of the flat plate 52. In addition, the straightening plate 5
5, a plurality of air passage openings (not shown) are formed in the outer peripheral portion, and a circular recessed portion 55a is formed in the center portion, and the recessed portion 55a is provided with the bearing housing portion 21 of the sub-frame 20. A fitting hole 55b that fits in the outer peripheral portion is formed. In addition, the sub-frame 20 is provided in the recess 55b.
A through hole 55c corresponding to the screw hole 23 formed in the above is formed. Further, the fan cover 56 is formed in a bottomed cylindrical shape having an opening at the bottom in the figure, and the bottom wall thereof, that is, the surface facing the curved plate 53, is the curved plate 5.
3, a suction port 56a is formed in the center of the curved plate 53 so as to correspond to the suction port 53b formed in the curved plate 53, and the inner peripheral wall near the opening of the annular wall 56b is It is a fitted portion that fits into a fitting portion 15a formed on the flange portion 15 formed on the main frame 10.

The fan 50 is mounted in the assembled state of the electric motor 1. That is, the sub-frame 2 with the electric motor 1 assembled.
First, the straightening vane 55 is arranged so that its through hole 55c corresponds to the screw hole 23 of the sub-frame 20, and the screw 4 is fastened and attached to the screw hole 23. Next, the centrifugal fan 51 is clamped by the mounting plates 57, 57 on the flat plate 52, and is mounted on the screw 45a of the rotary shaft 45 by the nut 59 via the washer 58. Next, the fan cover 56 is attached to the centrifugal fan 51 and the rectifying plate 5.
5, the fitted portion is fitted and fitted to the fitting portion 15a.

Next, the annular wall 35 of the slot insulating material 34, which is a heat-resistant member, is provided at both ends of the stator 30.
And a dust cover 60 provided between the both ends of the stator 30 and the bearing accommodating portions 13 and 21 by closely adhering the ends to the peripheral edge portions of the bearing accommodating portions 13 and 21, that is, the annular ridges 13a and 21a. And 70 will be described with reference to FIGS. 1 and 5 to 7. First, the dustproof cover 60 provided between the stator 30 and the bearing housing 21 of the sub-frame 20 will be described.

The dustproof cover 60 is made of elastic rubber or the like, and includes a large diameter tubular portion 61, a small diameter tubular portion 65, the large diameter tubular portion 61 and a small diameter tubular portion 65 as shown in FIG. The disc-shaped portion 67 to be coupled and the shape-retaining member 68 shown in FIG. A fitting groove 63 is formed by forming an annular rib 62 having a diameter smaller than the inner diameter of the large-diameter cylindrical portion 61 in the vicinity of the connecting portion of the large-diameter cylindrical portion 61 with the disc-shaped portion 67. . In addition, the annular rib 62 of the large-diameter tubular portion 61
, The inner peripheral wall on one end side of the dustproof cover 60 is hermetically fitted to the outer periphery of an annular wall 35 formed integrally with the slot insulating material 34 provided in the stator 30.
It has become. The fitting margin of the fitting portion 64 is the annular wall 3
5 is set to be smaller than the fitting length, that is, the protruding length from the end surface of the stator 30, and when the fitting portion 64 is fitted to the fitting wall 35, the edge does not contact the stator 30. It is designed to be separated. Further, in the drawing of the small diameter tubular portion 65, a fitting step portion 66 is formed at the upper edge portion, and the fitting step portion 66 is airtight with the annular raised portion 21a formed at the opening peripheral edge of the bearing housing portion 21. To fit into.

In the fitting groove 63 formed in the large-diameter cylindrical portion 61, the shape-retaining member 68 is formed of a member that is not easily deformed and is made of a thick paper or a thin plate made of a synthetic resin plate or the like.
Are fitted with their outer peripheral edges fitted. The shape-retaining member 68 is formed in a disk shape as shown in FIG. 6, and has a through hole 68a having a size substantially the same as the through hole 65a of the small diameter tubular portion 65 in the center. By providing the shape-retaining member 68 so as to overlap with the disc-shaped member 67, the annular raised portion 21a of the fitting step portion 66 of the small diameter tubular portion 65 is provided.
It is possible to increase the compressive force of pressure contact with. That is, even if a force orthogonal to the disc surface is applied to the disc-shaped member 67, the shape-retaining member 68 prevents the disc-shaped member 67 from being deformed in the direction orthogonal to the disc surface, and the small-diameter tubular portion 65.
The compressive force that presses the annular stepped portion 21a of the fitting stepped portion 66 becomes large, so that the fitted stepped portion 66 and the annular raised portion 21a are pressed against each other by a large compressive force, and sufficient airtightness is obtained. It will be obtained.

Next, the dustproof cover 70 provided between the stator 30 and the bearing housing portion 13 of the main frame 10 will be described. The dust-proof cover 70 is made of elastic rubber or the like, and has a large-diameter tubular portion 71, a small-diameter tubular portion 75, and a disc connecting the large-diameter tubular portion 71 and the small-diameter tubular portion 75, as shown in FIG. 7. It is composed of a shape portion 77 and a shape-retaining member 68 which is provided so as to overlap with the disk-shaped portion 77. And
A fitting groove 73 is formed by forming an annular wall 72 having a diameter smaller than the inner diameter of the large-diameter cylindrical portion 71 in the vicinity of the connecting portion of the large-diameter cylindrical portion 71 with the disc-shaped member 77. The inner peripheral wall of the large-diameter cylindrical portion 71 below the annular wall 72, that is, the inner peripheral wall on one end side of the dustproof cover 70 serves as the shielding wall integrally formed with the slot insulating material 34 provided in the stator 30. The fitting portion 74 is airtightly fitted to the outer circumference of the annular wall 35. The fitting margin of the fitting portion 74 is set to be smaller than the fitting margin of the annular wall 35, that is, the protruding length from the end surface of the stator 30, and when the fitting portion 74 is fitted to the fitting wall 35. The end edges of the stator are separated from each other without contacting the stator 30. Also, the small-diameter tubular portion 75
In the figure, a fitting step portion 76 is formed at the upper edge portion, and the fitting step portion 76 is airtightly fitted to the annular raised portion 13a formed at the opening peripheral edge of the bearing housing portion 13.

Then, in the fitting groove 73 formed in the large-diameter cylindrical upper wall 71, the shape-retaining member 68 is formed in the same manner as the dust-proof cover 60.
Can be attached by fitting the outer peripheral edge thereof. Further, by providing the shape-retaining member 68 so as to overlap the disc-shaped member 77, the annular raised portion 1 of the fitting stepped portion 76 of the small-diameter tubular portion 75 is provided as in the case of the dust-proof cover 60.
It is possible to increase the compressive force that presses against 3a. Therefore, good airtightness between the fitting stepped portion 76 of the small diameter tubular portion 75 and the annular raised portion 13a can be obtained.

A cylindrical lead wire protecting member 79 having a through hole 79a formed on the outer peripheral wall of the large-diameter cylindrical portion 71 is formed on the dust-proof cover 70 so as to project therefrom, and the tip end portion thereof is the main frame. It projects from the exhaust hole 14a formed in 10. A printed wiring board (hereinafter referred to as a wiring board) 80 described later is provided in the through hole 79a of the lead wire protection member 79.
The flexible lead wire 81 provided in the above and the lead wire 33a connected to the stator winding are inserted and drawn out of the main frame 10.

Further, the annular wall 3 formed on the slot insulating material 34 and located on the bottom wall 12 side of the main frame 10
5, a wiring board 80 is attached, and in the wiring board 80, various electronic components 82 constituting a drive circuit are attached to the surface on the side of the bottom wall 12 in FIG.
A Hall IC, which is one of the electronic components of a drive circuit that detects the rotational position of the rotor 40, is provided on the surface of the stator 30 side.
Is attached to the sensor 83. The sensor 83 has a sensor storage portion 39 formed on the protrusion 37.
It is housed and arranged in. In addition, the wiring board 80
The attachment to the annular wall 35 is performed by forming a through hole (not shown) formed in the wiring board 80 and fitting a fitting protrusion (not shown) formed in the annular wall 35 into the through hole. It is one that has become.

Next, a method of assembling the electric blower A having the above structure will be described.

First, a stator winding 33 is attached to the laminated iron core 31 of the stator 30 with a slot insulation 34 interposed, and then an electronic component or the like is attached to an annular wall 35 located on the bottom wall 12 side. After attaching 80, the dust-proof cover 70 to which the shape-retaining member 68 is attached is attached to the large-diameter cylindrical portion 7
The fitting portion 74 of No. 1 is fitted and attached to the annular wall 35 as a shielding wall. In this state, the end faces of the stator 30 of the dust cover 70 are separated from each other without coming into contact with them, so that the dust cover 70 is not affected by the heat of the stator 30 which becomes hot in the driving state. Has become. When fitting the dustproof cover 70 to the annular wall 35, the flexible lead wire 81 provided on the wiring board 80 and the lead wire 33a connected to the stator winding 33 are inserted into the through hole 79a of the lead wire protection member 79. . Then, the stator 30 is press-fitted into the main frame 10 and attached. Then, the rotor 40 having the bearings 46 and 47 attached to the rotating shaft 45 is inserted into the main frame 10 from the side of the bearing 46, and the bearing 46 is housed in the bearing housing portion 13 so that one of the rotating shafts Attach the side to the main frame 10. Then, the dust-proof cover 60 having the shape-retaining member 68 attached to the annular wall 35 located at the opening 11 of the main frame 10 is attached by fitting the fitting portion 64 of the large-diameter tubular portion 61.
In this state, the dustproof cover 60 is separated from the end surface of the stator 30 without coming into contact with the dustproof cover 60, and the dustproof cover 60 has a high temperature in the driving state.
It is not affected by the heat of. Next, the subframe 20 is attached to the main frame 10 with the screws 3 to assemble the electric motor 1. Then, the electric blower A is assembled by attaching the fan 50 to the assembled electric motor 1 according to the procedure described above.

In the electric blower A configured as described above, the dustproof cover 60 is formed of an elastic member, and the one end side, that is, the fitting portion 64 of the large-diameter cylindrical portion 61 is provided with the stator 30.
The dust-proof cover 6 is fitted to the annular wall 35 that is integrally formed with the slot insulating material 34 provided in
Since 0 is mounted separately from the end surface of the stator 30, the dustproof cover 60 does not come into contact with the stator 30 which becomes hot, and therefore the elastic member forming the dustproof cover 60 has heat resistance. Since it is not necessary to use it as a material, it can be inexpensive, and since the annular wall 35 is formed integrally with the heat-resistant slot insulating material 34 and is not a separate part, the number of parts is small and the assembly is easy. Since the dustproof cover 60 has elasticity, airtightness with the annular wall 35 can be enhanced. The same applies to the dustproof cover 70.

In the above embodiment, the annular wall 35 as a cylindrical shielding wall is formed integrally with the slot insulating material 34, but it is formed separately from the slot insulating material 34. Alternatively, the stator 30 may be attached to the end surface of the stator 30. However, when the structure is formed integrally with the slot insulating material 34 as in the above-described embodiment, the number of parts is smaller than that in the case where it is formed separately, and the assembling is easy, and the shield wall accommodates the coil winding 33. Storage groove 3
8 can be shared with the outer wall 35, and there is an advantage that the size can be reduced.

[0032]

According to the first aspect of the present invention, a cylindrical shielding wall made of a heat-resistant member is provided on the end surface of the stator, and one end side of the dustproof cover is attached to the shielding wall for attachment. Therefore, the dustproof cover does not need to have heat resistance, and the number of parts can be reduced and the cost can be reduced, and the airtightness of the dustproof cover can be enhanced.

According to the invention of claim 2, the shield wall is formed integrally with the slot insulating material provided on the stator. Therefore, in addition to the effect of the invention of claim 1, the shield wall is heat resistant. Since it is formed integrally with the slot insulating material having the above, it is not necessary to separately form it from a material having heat resistance, and there is an effect that the number of assembling steps can be reduced and the airtightness can be enhanced.

[Brief description of 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 the sub-frame of the above embodiment.

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

FIG. 4 is a plan view of the stator with the slot insulating material according to the above embodiment attached.

5A and 5B are views showing one of the dustproof covers of the above-described embodiment, FIG. 5A being a plan view thereof and FIG. 5B being a sectional view thereof.

FIG. 6 is a view showing the shape-retaining member of the above embodiment, (A)
Is a plan view thereof, and (B) is a sectional view.

7A and 7B are views showing the other dustproof cover of the above embodiment, FIG. 7A being a plan view thereof, and FIG. 7B being a sectional view.

[Explanation of symbols]

A electric blower 1 electric motor 2 electric motor frame 10 main frame 13 main frame bearing housing 13a main frame bearing housing annular ridge (outer circumference of bearing housing) 20 sub-frame 21 sub-frame bearing housing 21a sub- Annular ridge of the bearing housing of the frame (outer peripheral part of the bearing housing) 30 Stator 35 Annular wall (shielding wall) 40 Rotor 50 Fan 60, 70 Dust cover

Claims (2)

[Claims] 1. A bearing accommodating portion formed in a tubular shape inside a motor frame of an electric blower including a fan and a motor, wherein one end side is provided on the stator side and the other end side is provided on the frame. In an electric blower in which a dustproof cover is provided in contact with each of the peripheral edges to prevent inflow of suction air from the fan into the inside of the dustproof cover to prevent dust, the dustproof cover is formed of an elastic member, and The dustproof cover is provided so as to be separated from the stator by bringing the dustproof cover into contact with the other end of a cylindrical shielding wall made of a heat-resistant member provided with one end in contact with the stator. An electric blower characterized by. 2. The electric blower according to claim 1, wherein the shielding wall is formed integrally with a slot insulating material provided on the stator.