JP2576595Y2 - Electric vacuum cleaner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for sound insulation of an electric blower.

[0002]

2. Description of the Related Art Conventionally, an electric vacuum cleaner is provided with an electric blower, which sucks dust together with air and the like, and captures the dust in a dust collecting bag provided in a dust collecting chamber. .

[0003] Such an electric vacuum cleaner uses, for example, an electric blower 1 as shown in FIG. The electric blower 1 has a motor frame 2 having a substantially cylindrical shape. A rotatable armature (an armature) is provided inside the motor frame 2 and is fixed to the motor frame 2 around the armature. Field (stator) is stored. Further, a commutator is provided on the armature, and a brush mechanism 3 holding a carbon brush, which is in sliding contact with the commutator and conducts, by a brush holder is fixed to the motor frame 2. The brush mechanism 3 is supported in a state substantially orthogonal to the axial direction of the armature, and
Since the longitudinal dimension is large, it is fixed in a state where a part thereof protrudes to the outer peripheral side of the motor frame 2.

On the other hand, a fan having a diameter larger than that of the motor frame 2 is mounted at the tip of the rotating shaft of the armature. The fan is covered by a substantially cylindrical fan cover 5. The fan cover 5 is fitted to a flange portion 2a protruding in the outer peripheral direction from the distal end of the motor frame 2.

Then, by driving the armature to rotate the fan, air is sucked from a suction port formed at the tip of the fan cover 5 and blown out from a blow port 2b formed on a side surface of the motor frame 2. It has become.

In a state where the fan rotates, for example,
A high-frequency blade noise of about 4.5 kHz is generated, and the blade noise is generated by the fan cover 5 and the flange portion of the motor frame 2.
It leaks out of the gap with 2a, the screw hole formed in the flange portion 2a, and the like. Therefore, in order to cut off the feathering noise, a sound insulating plate 6 made of a high-density paper or the like is fitted into the motor frame 2, and is screwed into the motor cover 2 in a state in which the sound insulating plate 6 is in close contact with the rear side of the fan cover 5. It is designed to shield feather noise that leaks from such places.

[0007]

However, in the above-described conventional electric blower 1, a part of the brush mechanism 3 protrudes to the outer peripheral side of the motor frame 2 and also extends from the front end of the motor frame 2 to the outer peripheral side. Thus, a flange portion 2b protrudes. Therefore, in order to fit the sound insulating plate 6 from the rear side of the motor frame 2 and closely adhere to the rear side of the fan cover 5, it is necessary to form a cutout 6 a in the sound insulating plate 6 for inserting the brush mechanism 3. is there. Therefore, even when the sound insulating plate 6 is in close contact with the rear side of the fan cover 5, the noise of the feather noise leaks out from the notch 6 a of the sound insulating plate 6, and it is difficult to improve the quietness of the vacuum cleaner. Have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum cleaner capable of effectively shutting off a sound generated by an electric blower.

[0009]

According to a first aspect of the present invention, there is provided an electric vacuum cleaner comprising an electric blower and a sound insulating plate for cutting off a sound generated by the electric blower, wherein the electric blower has a substantially cylindrical motor body. A projecting portion protruding from a part of an outer peripheral portion of the motor body, a fan disposed on the front side of the motor body and driven to rotate by the motor body, and a motor body covering the fan. Also has a fan cover having a large diameter dimension, the sound insulating plate has a fitting hole fitted to the outer peripheral portion of the motor main body, and the sound insulating plate is formed by connecting the fitting hole to the motor main body. In the vacuum cleaner, which is fitted to the rear side of the fan cover while being fitted to the outer peripheral portion, a cutout portion through which the protrusion can be inserted is formed in the sound insulating plate, and the cutout portion can be closed. Formed flexible lid piece Than it is.

According to a second aspect of the present invention, there is provided an electric vacuum cleaner comprising an electric blower and first and second sound insulating plates for blocking sounds generated by the electric blower, wherein the electric blower has a substantially cylindrical motor body and A projecting portion protruding from a part of an outer peripheral portion of the motor body, a fan disposed on the front side of the motor body and driven to rotate by the motor body, and a motor body covering the fan. A fan cover having a large diameter dimension, each of the sound insulating plates has a fitting hole fitted to an outer peripheral portion of the motor main body, and these sound insulating plates are connected to the motor main body by the fitting holes. In the vacuum cleaner fitted to the rear side of the fan cover in a state fitted to the outer peripheral portion of the portion, a cutout portion through which the protrusion can be inserted is formed in each of the sound insulation plates, and these sound insulation plates are formed. The rear side of the fan cover In close contact state, at different positions of the notch portions of the sound insulating plate to each other and each notch which was closed by mutual sound insulating plate.

[0011]

According to the first aspect of the present invention, the sound insulating plate is formed with the cutout portion through which the protrusion can be inserted and the flexible lid piece that can close the cutout portion. Is fitted into the motor body, the projections pass through the cutouts with the lid piece bent, and the sound insulating plate is easily brought into close contact with the rear side of the fan cover. Further, in a state in which the sound insulating plate is in close contact with the rear side of the fan cover, the notch is closed by the cover piece, and the sound generated by the electric blower is cut off.

In the vacuum cleaner according to the present invention, since the first and second sound insulation plates each having a cutout portion through which the projection can be inserted are provided, when each sound insulation plate is fitted to the motor body, The projections pass through the cutouts of the sound insulation plates, and the sound insulation plates are easily brought into close contact with the rear side of the fan cover. In addition, the positions of the cutouts of these sound insulating plates were made different from each other in a state in which these sound insulating plates were in close contact with the rear side of the fan cover, and the cutouts were closed by the respective sound insulating plates. The sound of the sound is cut off.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the vacuum cleaner of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 11 denotes a cleaner main body. The cleaner main body 11 has a main body case 12 having an open upper side, and an upper case 14 is mounted on the upper side of the main body case 12, A lid 15 is attached to the front upper side of the upper case 14 so as to open and close the opening of the main body case 12 from above. Further, the upper side of the upper case 14 is continuously covered with a case cover 16, an accessory cover 17, and an exhaust port cover 18 from the rear end of the lid 15 to the upper rear end of the main body case 12. As a whole, a substantially eggshell-shaped cleaner body 11 whose longitudinal direction is the front-rear direction is formed. Further, a substantially U-shaped handle 19 slidable up and down is attached to the cleaner body 11 at a substantially central portion in the front-rear direction.

The case cover 16 is provided with a concave portion 16a for making it easier to grip the handle 19. And
The accessory cover 17 is attached so as to be openable and closable, and an accessory storage portion 17a formed below the accessory cover 17 is provided.
In addition, accessories such as a vine port 20 are stored. further,
The exhaust port cover 18 has a rear end surface 18a formed in a substantially vertical plate shape, and a peripheral surface portion 18b formed so as to decrease in diameter stepwise from the front side to the rear side. The two exhaust ports 18c and 18d, which are curved in a substantially semicircular shape along the outer peripheral surface of the cleaner body 11, are formed on the outer peripheral surface of the cleaner body 11 so as to be substantially concentric with each other.

In the main body case 12, a turning wheel 21 is mounted on the lower front side so as to be variable in direction and rotatable, and a pair of driven wheels 22 on both sides are rotatably mounted on both rear sides. Further, a band-shaped bumper 23 made of an elastic body is attached to the front peripheral surface of the main body case 12.

The inside of the main body case 12 has a lattice hole 25a.
The front and rear are partitioned by a partition wall 25 having
, A dust collecting chamber 27 for storing a dust collecting bag 26 is formed, and an electric blower chamber 28 is formed behind the partition wall 25. At the front side of the partition wall 25, a detachable auxiliary filter 29 that covers the lattice hole 25a is attached.

The dust collecting chamber 27 is provided with a holder 31 facing the opening of the main body case 12, and the holder 31 holds the opening frame 26a of the dust collecting bag 26 in a detachable manner.

On the other hand, the electric blower room 28 houses an electric blower 32 having a front side as an intake side and a rear side as an exhaust side. The electric blower 32 includes vertical support walls 33, 34, 34, 34, which are protruded from the main body case 12 and the upper case 14, respectively.
35, it is supported in a sandwiched state via rubber holding members (support rubbers) 36, 37, and an annular sound insulating plate 38 is fitted on the outer peripheral portion. Is covered with a silencer 39 of

In the electric blower chamber 28, an intake side and an exhaust side of the electric blower 32 are air-tightly partitioned by an annular front holding member 36, and the intake side of the electric blower 32 is interposed through a lattice hole 25a. The exhaust side of the electric blower 32 is communicated with the inside of the exhaust port cover 18 while communicating with the dust collecting chamber 27.

The lid 15 is rotatably supported with the rear end as a fulcrum, and is provided near the opening of the main body case 12 by a clamp 44 rotatably provided at the lower end on the front side. The locking portion 45 is detachably locked. Then, by raising the clamp 44 upward,
At the same time as the engagement of the clamp 44 is released, the lid 15 is turned upward to open the opening, and the dust collection bag 26 is replaced.

An opening 51 is formed in the cover 15 and extends upward from the front side.
A cylindrical connecting body 54 is rotatably mounted inside the air path plate 52, and inside the connecting body 54, the outside of the cleaner body 11 and the dust collection chamber 27 are attached. Is formed.

A hose (not shown) having an operating portion at the tip is rotatably connected to the suction port 55,
In addition, at the end of this hose,
A suction port is connected. Also, the outlet
A plate-like shutter 56 for closing the insertion port 51 without connecting the hose is provided between the suction port 55 and the suction port 55 so as to be freely opened and closed.

Further, the lid 15 is provided with a display panel 58 provided with a plurality of light emitting diodes 57 and the like for indicating the operating state of the electric blower 32 and the like.

Next, the electric blower 32 and the sound insulating plate 38 will be described.

As shown in FIGS. 1 and 2, the electric blower 32 has a substantially cylindrical motor frame 61. A motor body 62 is housed inside the motor frame 61, and a motor body 63 Are formed.

The motor frame 61 has an opening 61a formed in the front end face thereof.
Flange with a substantially U-shaped cross-section around the circumference
61b is bent. Also, this motor frame 6
The rear end face 1 is closed by a rear plate portion 61c, and a central portion of the rear plate portion 61c is recessed toward the rear side to form a bearing recess 61d, and a spring housed in the bearing recess 61d. A rear bearing 66 is constituted by the bearing 64, the bearing 65, and the like. The holding member 37 is fitted outside the bearing recess 61d.

Further, a pair of air outlets 61e on both sides are formed on the side surface near the rear end of the motor frame 61.

The flange portion 61 of the motor frame 61
A plurality of screw holes 67 are formed in b, and a front frame 71 is mounted on the front side of the motor frame 61 by screws 68 screwed into the screw holes 67. A bearing recess 71a recessed toward the front side is formed at the center of the front frame 71, and a front bearing 73 is formed by the bearing 72 and the like housed in the bearing recess 71a. .

The motor main body 62 includes a motor frame 61.
A substantially cylindrical field (stator) 74 fixed to the
An armature (armature) 75 is provided inside the field 74. The armature 75 has a rotor shaft 76 provided at an axial center portion thereof supported by front and rear bearing portions 73 and 66 to rotate. It is freely supported.

Further, a pair of brush mechanisms 77 as projections are fixed to the motor frame 61 by screws 78. Each brush mechanism 77 includes a carbon brush 78 that slides on a commutator 75a provided on the armature 75, and a brush holder 79 that holds the carbon brush 78. The brush holder 79 extends in the longitudinal direction. It is supported in a direction substantially perpendicular to the axial direction of the rotor shaft 76, and is supported in a state where a part thereof protrudes outside the motor frame 61.

The carbon brush 78 is pressed by the brush holder 79 and slidably contacts the commutator 75a, so that the carbon brush 78 and the commutator 75a are electrically connected to each other.

On the other hand, on the front side of the front frame 71, a current plate
81 is fixed with screws 82. Furthermore, this rectifier plate 81
, A fan 84 is arranged. The fan 84 has a sleeve 85 fitted on the rotor shaft 76 and a screw portion 76a formed on the tip of the rotor shaft 76.
It is clamped by the square nut 86 via washers 87 and 87 and is fixed to the tip of the armature 75.

Further, the flange portion 61 of the motor frame 61
A fan cover 88 having a substantially cylindrical shape is fitted to the outer peripheral portion of b, and the fan cover 88 covers the fan 84. This fan cover 88 has a suction port at the center of the front
88a are formed, and a rear opening 88b is formed on the entire rear surface.

The sound insulating plate 38 is fitted to the motor frame 61 in a state of being in close contact with the rear end of the fan cover 88 and covering the rear opening 88b of the fan cover 88.

As shown in FIGS. 1 to 3, the sound insulating plate 38 has a substantially annular plate shape and is made of high-density paper or the like. The sound insulation plate 38 has a motor frame 61
The outer diameter of the fitting hole 91 is substantially the same as the outer diameter of the outer periphery of the motor frame 61. The outer diameter of the sound insulating plate 38 is formed to be larger than the outer diameter of the fan cover 88.

Further, a pair of cutouts 92 are formed in the sound insulation plate 38 so as to face each other so as to communicate with the fitting holes 91, and a bendable tongue-like shape that covers these cutouts 92 is formed. A lid piece 94 is formed. That is, each cutout portion 92 and each lid piece portion 94 form two cut lines 95, 95 communicating with the fitting holes 91 in the sound insulating plate 38 in parallel with each other, and these two cutouts 95, 95. A perforation 96 formed by a chain line-shaped cut is formed between the leading ends of the insertion lines 95. The distance between the two cut lines 95, 95 that make up the pair is
The width dimension of the brush mechanism 77 projecting from the outer peripheral portion of the motor frame 61 is set slightly larger than the width dimension of the brush mechanism 77, and the length dimension of each cutting line 95 is slightly larger than the projecting dimension of the brush mechanism 77 projecting from the outer peripheral portion of the motor frame 61. Is set.

Then, the sound insulating plate 38 is pushed in from the rear end side of the electric blower 32 in a state where the fitting hole 91 is fitted into the motor frame 61, and comes into close contact with the rear end of the fan cover 88.
The fan cover 88 is held so as to cover the rear opening 88b.

In the process of fitting the sound insulating plate 38 to the motor frame 61, the notches 92 and the brush mechanism 77 are aligned with each other, so that each lid piece 94 comes into contact with the brush mechanism 77. In this state, each of the cover pieces 94 is bent from the perforation 96 to open each of the notches 92, and the sound insulating plate 38 passes through the brush mechanism 77 with each of the brush mechanisms 77 inserted through each of the notches 92.

Subsequently, the sound insulating plate 38 is pushed in, and the sound insulating plate is
When the cover 38 is brought into close contact with the rear end of the fan cover 88, as shown in FIG. 4, the lid pieces 94 are bent from the perforations 96. As shown in FIG. 5, each cutout 92 is closed by flushing it with the other part of the sound insulating plate 38 as shown in FIG.

As described above, in the vacuum cleaner using the general and inexpensive electric blower 32 having the brush mechanism 77 having the carbon brush 78, a part of the brush mechanism 77 is provided on the outer peripheral portion of the motor frame 61. According to the vacuum cleaner of the present embodiment, each notch 92 of the sound insulating plate 38 and the brush mechanism 77 protrude.
By fitting the sound insulating plate 38 into the motor frame 61, the lid pieces 94 abut against the brush mechanism 77 and bend, making the sound insulating plate 38 easily adhere to the rear side of the fan cover. be able to.

Then, in a state where the sound insulating plate 38 is in close contact with the rear side of the fan cover 38, each cover piece 94 is pressed to
38 By keeping them flush with the rest,
The notch 92 can be easily closed by the 94.

Since the notch 92, which is the opening of the sound insulating plate 38, is closed by the cover piece 94, a high frequency feathering noise of, for example, about 4.5 kHz is generated while the fan 84 is rotating. However, the noise generated by the electric blower 32, such as the blade noise, is generated by the fan cover 88 and the flange portion of the motor frame 61.
Even if it leaks out of the gap with the flange 61b or the screw hole 67 formed in the flange 61b, the noise of the feathering noise etc. is reduced.
Thus, the vacuum cleaner can be more effectively shut off, and the vacuum cleaner can be made even quieter.

Further, a general and inexpensive electric blower 32 having a brush mechanism 77 having a carbon brush 78 can be used, and the sound insulating plate 38 can be made of a substantially annular plate of high density paper or the like. Since it can be easily manufactured only by forming the predetermined cut lines 95 and the like, the manufacturing cost of the vacuum cleaner can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In this embodiment, the cleaner main body 11 shown in FIG.
The first and second two sound insulation plates 101 are attached to the electric blower 32 of FIG.
, 102.

Each of the sound insulation plates 101 and 102 is formed in substantially the same shape from high-density paper or the like.
Fitting hole 105 that fits into motor frame 61 of electric blower 32
Is formed and the outer diameter dimension is
It is formed larger than the outer diameter of 88.

Each of the sound insulation plates 101 and 102 has a respective fitting hole.
105, and opposed, substantially rectangular notches 106, 10
6 are formed, and triangular auxiliary notches 107 are formed at four places so as to communicate with the respective fitting holes 105. Each of the notches 106 is, like the notch 92 of the sound insulation plate 38 of the first embodiment shown in FIG.
A brush mechanism 77 protruding from is formed in a shape that can be inserted.

Further, each of the sound insulation plates 101 and 102 is formed with a substantially U-shaped notch at two places, and is formed with bendable engagement pieces 108 and 108. That is, these engaging pieces 108 are cut out substantially concentrically with the outer peripheral edges of the sound insulating plates 101 and 102, and one end 108a is connected to each of the sound insulating plates 101 and 102 as shown in FIG. And the other end 108b is formed to be swingable in a state of being separated from the sound insulating plates 101 and 102.

As shown in FIGS. 8 and 9, in the first sound insulating plate 101 and the second sound insulating plate 102, the corresponding engagement piece 108 is located at the center of each sound insulating plate 101, 102. The engaging pieces 108 are formed in symmetrical positions and shapes with the passing line as the axis of symmetry, and the corresponding engaging pieces 108 are formed to face each other with their opposite ends separated.

The first sound insulating plate 101 and the second sound insulating plate 102 are brought into close contact with each other so that the corresponding engaging pieces 108 can be engaged with each other in a state where they are relatively rotated in opposite directions. Has become.

Further, with the engagement pieces 108 of the first sound insulation plate 101 and the engagement pieces 108 of the second sound insulation plate 102 being engaged in this manner, each notch of the first sound insulation plate 101 is Part 106 and the second
Each of the notches 106 of the first sound insulating plate 102 is held at a position shifted by about 90 degrees in the circumferential direction, and each of the auxiliary notches 107 of the first sound insulating plate 101 and each of the auxiliary notches 106 of the second sound insulating plate 102 Notch 10
In both cases, they are held at positions shifted from each other.

The sound insulating plates 101 and 102 are fitted in the respective fitting holes 105 sequentially into the motor frame 61 of the electric blower 32 from the rear side, and the brush mechanism 77 is inserted through the cutouts 106. It is in close contact with the rear side of the fan cover 88, and closes the rear opening 88b of the fan cover 88. Further, in this state, by rotating at least one of the sound insulation plates 101 and 102 and engaging the corresponding engagement pieces 108 with each other, the first sound insulation plate 101 allows each of the second sound insulation plates 102 to be engaged. The notch 106 and each auxiliary notch 107 are closed, and the second sound insulating plate 102 closes each notch 106 and each auxiliary notch 107 of the first sound insulating plate 101.

As described above, according to the present embodiment, the first and second two sound insulating plates 101 and 102 are provided, and the notch 106 through which the brush mechanism 77 can be inserted is inserted into each of the first and second sound insulating plates 101 and 102. By forming the sound insulation plates 101 and 102, the sound insulation plates 101 and 102 can be easily adhered to the rear side of the fan cover 88. Further, each of the sound insulation plates 101 and 102 is easily positioned while rotating at least one of the sound insulation plates 101 and 102 and the corresponding engaging pieces 108 are engaged with each other, and the sound insulation plates 101 and 102 are positioned. In this state, each notch 106 and each auxiliary notch 107 are closed with each other. Thus, the noise of the fan 84 can be effectively cut off, and the vacuum cleaner can be made quieter.

Each engagement piece 108 is connected to each sound insulation plate 101,
Since it is cut out almost concentrically with the outer peripheral edge of 102,
The sound insulation plates 101 and 102 can be easily engaged by rotating each other.

[0056]

According to the first aspect of the present invention, the sound insulating plate has a notch portion through which a protrusion protruding from the motor main body can be inserted, and a flexibility capable of closing the notch portion. When the sound insulation plate is fitted to the motor main body, the projections are inserted through the cutouts, and the sound insulation plate is easily inserted into the rear side of the fan cover when the cover piece is bent. Can adhere to In addition, the notch can be closed by the cover piece in a state where the sound insulating plate is in close contact with the rear side of the fan cover. Therefore,
For example, sound passing between the motor body and the fan cover can be effectively blocked, and the vacuum cleaner can be made quieter.

According to the second aspect of the present invention, since the first and second sound insulating plates each having a cutout portion through which a projection projecting from the motor main body can pass are provided.
When each sound insulating plate is fitted to the motor main body, the projections pass through the cutouts of each sound insulating plate, and the sound insulating plate can be easily brought into close contact with the rear side of the fan cover. Further, in a state where these sound insulating plates are in close contact with the rear side of the fan cover, the positions of the cutouts of these sound insulating plates can be made different from each other, and the cutouts of the respective sound insulating plates can be closed by the sound insulating plates. So, for example,
The sound passing between the motor body and the fan cover can be effectively cut off, and the vacuum cleaner can be made quieter.

[Brief description of the drawings]

FIG. 1 is a side view, partially cut away, of an electric blower and a sound insulating plate showing an embodiment of the electric vacuum cleaner of the present invention.

FIG. 2 is a sectional view of the electric vacuum cleaner.

FIG. 3 is a front view of the sound insulating plate.

FIG. 4 is a perspective view showing a step of fitting a sound insulating plate to the electric blower.

FIG. 5 is a perspective view showing a state in which a sound insulating plate is fitted to the electric blower.

FIG. 6 is a perspective view showing a state in which a sound insulating plate is fitted to an electric blower according to another embodiment of the present invention.

FIG. 7 is a front view of the sound insulating plate.

FIG. 8 is an explanatory diagram showing a state in which the above sound insulating plate is combined.

FIG. 9 is an explanatory diagram showing a state in which the sound insulating plate is combined.

FIG. 10 is a perspective view showing a state in which a sound insulating plate is fitted to an electric blower of a conventional vacuum cleaner.

[Explanation of symbols]

 32 Electric blower 38 Sound insulation plate 63 Motor body 77 Brush mechanism as projection 84 Fan 88 Fan cover 91, 105 Fitting hole 92, 106 Cutout 94 Cover piece 101 First sound insulation plate 102 Second sound insulation plate

Continuing on the front page (72) Inventor Takeshi Sato 43, Horiyamashita, Hadano-shi, Kanagawa Prefecture Inside the Hadano Plant of Tokyo Electric Co., Ltd. , U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47L 9/00 103 A47L 9/00 A47L 9/22 H02K 5/24

Claims (2)

(57) [Scope of request for utility model registration] An electric blower and a sound insulating plate for blocking sound generated by the electric blower, wherein the electric blower protrudes from a substantially cylindrical motor body and a part of an outer peripheral portion of the motor body. And a fan cover arranged on the front side of the motor main body and driven to rotate by the motor main body, and a fan cover having a larger diameter than the motor main body that covers the fan. The plate has a fitting hole for fitting to the outer peripheral portion of the motor main body, and the sound insulating plate is fitted on the outer peripheral portion of the motor main body in a state where the fitting hole is fitted to the outer peripheral portion of the motor main body. In the vacuum cleaner in close contact with the portion, a notch portion through which the protrusion can be inserted is formed on the sound insulating plate, and a flexible lid piece that can close the notch portion is formed. Vacuum cleaner to do. 2. An electric blower, comprising: a first and a second sound insulating plate for shutting off a sound generated by the electric blower, wherein the electric blower has a substantially cylindrical motor body, and an outer peripheral portion of the motor body. A protrusion protruding from a part of the motor body, a fan disposed in front of the motor body and driven by the motor body, and a fan cover having a larger diameter than the motor body covering the fan. Each of the sound insulating plates has a fitting hole fitted to the outer peripheral portion of the motor main body portion, and these sound insulating plates are fitted with the fitting holes to the outer peripheral portion of the motor main body portion. In a vacuum cleaner in close contact with the rear side of the fan cover in a state, a cutout portion through which the protrusion can be inserted is formed on each of the sound insulating plates, and these sound insulating plates are provided on the rear side of the fan cover. In close contact, these Tone plates made different from each other the position of the notch of the electric vacuum cleaner, characterized in that closing the respective cut-out portions by mutual sound insulating plate.