JPH0798033B2 - Vacuum cleaner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner suitable for reducing noise in a cleaner body.

[Conventional technology]

In a conventional vacuum cleaner, as shown in Japanese Patent Publication No. 55-28694, a sound absorbing structure that absorbs sound through an exhaust flow in a bent space is adopted.

[Problems to be Solved by the Invention]

In the above-mentioned conventional technology, in order to increase the sound deadening effect, the exhaust pipe is bent a plurality of times to make it long, or the sound absorbing material is arranged on the inner surface of the pipe, so that the sound deadening structure is complicated and requires a large volume. Had the drawback that

An object of the present invention is to provide an electric vacuum cleaner having a sound deadening structure having a simple structure.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a feature of the present invention is that a cleaner main body in which an electric blower is disposed close to the inner bottom, and the cleaner main body is rotatable relative to the cleaner main body. A basin-shaped wheel stand, and a plurality of casters located outside the outer circumference of the cleaner body for moving the cleaner body and rotatably arranged on the wheel stand. A first gap formed between the bottom of the cleaner and the mounting table, and a space wider than the first gap formed by the bottom end of the cleaner body and the mounting table that communicates with the first gap. And a second gap that communicates with the space and is formed upward of the cleaner body, and communicates with the first gap at the bottom of the cleaner body located below the electric blower. The opening is formed.

[Action]

The air flow that propagates the sound waves generated by the electric blower is caused by the first gap formed by the bottom of the cleaner body and the mounting table and the first gap.
A space that is in communication with the space between the bottom of the cleaner body and the mounting table and that is wider than the first space, and a second space that communicates with the space and is located above the cleaner body. By passing through the space of, the compression and expansion are repeated a plurality of times and then discharged to the outside of the machine, so that noise can be significantly reduced.

〔Example〕

An embodiment of the electric vacuum cleaner of the present invention will be described below with reference to the drawings. The cleaner body 1 is composed of an electric blower 2, a cord reel 4 around which a power cord 3 is wound, and a dust collecting portion 6 in which a paper bag filter 5 is housed. The dust collecting portion 6 is provided with a dust collecting lid 7. . The vacuum cleaner body 1 includes a hemispherical upper case 1a and a circular, deep dish-shaped lower case 1b. An opening window 60 is formed on the bottom surface of the lower case 1b for discharging the exhaust air of the electric blower 2,
It is configured such that it is fitted into a circular wheel base 10 having a diameter larger than that of the lower case 1b through a minute gap 50 and is rotatable via a rotary shaft 9. The void 50 is formed by the lower case 1b and the wheel stand 10, and is continuously formed by the radial void 50a and the axial void 50b.

Explaining each part further, the electric blower 2 includes a vibration-proof rubber 1
It is held by the cleaner body 1 so as to be clamped from both sides by 1,12. A sound absorbing cover 13 and a sound insulating wall 14 are provided around the electric blower 2. A sound deadening cylinder 15 is integrally formed with the sound insulation wall 14. The dust collecting part 6 is provided with an inner case 16 that is in contact with the vibration isolating rubber 12 on the front side of the electric blower 2.
Inside the inner case 16, stretch the filter material,
Moreover, a box-shaped after filter 17 is mounted. The paper bag filter 5 can be set inside the after filter 17. After filter
An airtight packing 18 is provided around the opening of 17.
The airtight packing 18 is configured to contact the open end of the inner case 16 and the back cover 18 of the dust collecting lid 7 to keep the dust collecting portion 6 airtight. Further, the dust collecting lid 7 is provided with a hose attachment port 20 to which a hose 19 can be detachably attached. The paper bag filter 5 is attached and detached by releasing the clamp 21 and opening and closing the dust collecting lid 7.

On the upper surface of the cleaner body 1, a carrying handle 22 and a dust meter 23 for displaying the clogging amount of the filter are provided. An annular step 51 is formed at a corner of the lower case 1b, and a plurality of wheels 24 are attached to the bottom surface thereof. The wheels 24 come into contact with the inner surface of the wheel stand 10 to rotate the cleaner body 1 and the wheel stand 10. In addition to smoothing the movement, a void 52 is formed as an exhaust passage. A space 53 is formed between the step 51 and the corner of the wheel stand 10, and the cleaner body 1 of the opening window 60 is formed.
A wall that is smaller than the height of the wheel 24 is
54 is formed.

The wheel stand 10 is fixed to the lower case 1b of the cleaner main body 1 and the lower side of the rotation shaft 9 with a screw via a washer, and can rotate about the rotation shaft 9, but when rotated 360 degrees, the wheel base 10 is stopped. When it hits 25, its rotation is suppressed. I.e. right 360
It can be rotated 360 degrees to the left. The caster 8 is
It is provided so as to protrude from the outer shape of the cleaner body 1. On the side of the wheel base 10, the caster mounting portion is provided so as to cover the caster 8.
26 is provided so as to project outward, and a concave portion 55 is formed inside so as not to hinder the turning of the caster, and the space 53 is divided into a plurality of chambers. Castor mounting part 26
A bumper 27 for preventing damage to furniture and the like is arranged on the outer periphery of the wheel stand 10. The bumper 27 forms the outermost shape of the cleaner body 1.

A power cord outlet 29 is provided on the rear side of the cleaner body 1.

In the above configuration, when using the vacuum cleaner, the hose 19, the extension pipe 30, and the suction port 31 are connected to the hose attachment port 20 of the vacuum cleaner body 1.
, And pull out the power cord 3 from the cord outlet 29 and insert it into an outlet (not shown). Next, when the operation switch 32 at the tip of the hose 19 is turned on, the electric blower 2 is operated, and the suction force causes an air flow containing multiple dusts from the suction port 31 to pass through the extension pipe 30 and the hose 19 and collect the dust. 6 and paper bag filter 5 separates dust and clean air, and only the clean air flow passes through electric blower 2, silencer 15, opening window 60, gap 52, space 53, radial gap 50a, and shaft. Directional air gap
Emitted from 50b. When the room is cleaned in this state, the bumper 27 protects the furniture 33 and the like from damage even if the wheel stand 10 and the caster mounting portion 26 hit the obstacle 33 such as furniture placed in the room.

Further, in the present vacuum cleaner, since the cleaner main body 1 can rotate on the wheel base 10, it is easy to change the direction of the hose 19 in a small room or the like, and moreover, the direction of the surface to be cleaned is changed by the caster 8. Instead, the wheel 24 is rotated by the wheel 24 between the wheel base 10 and the cleaner main body 1, so that it is possible to operate lightly without being affected by the rotation on the surface to be cleaned. On the contrary, even if the caster cover 26 or the like pulls the cleaner body 1 around and catches on the feet of a table or the like as shown in FIG. The vacuum cleaner can be moved smoothly even in a room with a lot of furniture.

In addition, since the cleaner body 1 does not rotate indefinitely with respect to the wheel stand 10 and limits the rotation angle, the power cord 3 is connected to the wheel stand 10.
The vacuum cleaner can be pulled around without wrapping around. Further, in the vacuum cleaner of the present embodiment, the caster 9 is disposed so as to project to the outside of the cleaner main body 1, and the bumper 27 of the cleaner main body 1 is configured to have the maximum outer shape portion, so that the cleaner 9 contacts the obstacle. Even if the cleaner main body 1 side to which the hose 19 is attached is fixed, the lower wheel stand 10 can be rotated and avoided. Furthermore, since the root of the caster part that is overhanging is tied to the outer circumference of the wheel stand 10 in a smooth shape,
Even if it hits an obstacle, it can slip to avoid it, and since the casters 9 are arranged in four directions, it is possible to smoothly change the direction and overcome the threshold. Further, according to the present embodiment, since the electric blower 2 and the cord reel 4 are arranged at a low position, a low center-of-gravity structure can be adopted even when the cleaner falls, which is advantageous for the fall. Further, according to the present embodiment, the discharge of the air flow that propagates the sound waves generated by the electric blower 2 is performed by the opening window 60.
After passing through, it passes through the minute gap 52 formed by the lower case 1b and the wheel stand 10, the space 53 with a large volume, and the minute gap 50, is discharged to the outside of the machine, and repeats compression and expansion through a long path. Despite its simple structure, it has a great noise reduction effect. Furthermore, since the space 53 is divided into a plurality of recesses 55 of the wheel base 10 to form a plurality of muffling chambers, the exhaust flow is dispersed without being concentrated in the shortest path, and a further noise reduction effect can be obtained. It is possible to obtain an effect that dust on the floor is not scattered and flames such as an oil stove are not excessively burned. Further, since the opening window 60 is formed in the vicinity of the electric blower 2, the ventilation loss can be reduced, and the hot air that has been cooled by the electric blower 2 and is enhanced is discharged directly to the outside of the cleaner body 1. It is possible to prevent heat from damaging an electric circuit or the like (not shown). In addition, since the wall 54 is formed at the peripheral edge of the opening window 60, the exhaust flow does not directly go out of the machine, the effect of noise reduction is enhanced, and the wheels close to the opening window 60 are provided.
The blowing of hot air to the contact point between the wheel base 10 and the wheel stand 10 is alleviated, which has the effect of preventing thermal deformation.

Further, since the wheel stand 10 is covered from the outside in the electric blower 2 part, the noise generated by the electric blower 2 has a double case structure by the case of the lower case 1b and the wheel stand 10, so that the sound insulation effect is achieved. Is increased, and the noise can be further reduced. Since the shape of the vacuum cleaner body 1 and the wheel stand 10 when viewed from above is close to a perfect circle, rotation can be performed with a minimum radius even when changing directions in a narrow portion.

〔The invention's effect〕

According to the present invention, the first air gap formed by the bottom of the cleaner body and the mounting table for the exhaust air of the electric blower, the bottom end of the cleaner body and the mounting table communicating with the first space. Since it is configured to exhaust to the outside of the cleaner body through a space portion wider than the first gap formed by and a second gap which is formed in communication with the space portion and is formed toward the upper side of the cleaner body. ,
By repeating compression and expansion multiple times and discharging it outside the machine, noise can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part according to an embodiment of the present invention, FIG. 2 is an overall perspective view showing a cleaning state, FIG. 3 is an external view from the top of the cleaner body, and FIG. 4 is an obstacle. FIGS. 5 and 6 are schematic views for explaining the operation, FIG. 7 is a perspective view of the dust collecting part, and FIG. 8 is an enlarged cross-sectional view of the main part. 1 ... Vacuum cleaner body, 2 ... Electric blower, 8 ... Castor, 10
… Wheel stand, 50… Void, 51… Step, 52… Void, 53… Space,
55 ... recess, 60 ... opening window.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Nakazato 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Taga factory (56) References Japanese Patent Sho 57-9810 (JP, B2) Actual Japanese Sho 39-36303 (JP, Y1)

Claims (2)

[Claims] 1. A cleaner body in which an electric blower is arranged close to the inner bottom, a basin-shaped wheel stand arranged so as to be rotatable relative to the cleaner body, and the cleaner. A plurality of casters, which are located outside the outer circumference of the cleaner main body for moving the main body and are rotatably arranged on the wheel base, are formed by the bottom of the cleaner main body and the mounting table. First
Space, which is in communication with the first space and is formed by the bottom end of the cleaner body and the mounting table, and is wider than the first space, and communicates with the space part above the cleaner body. A second gap formed toward the bottom of the cleaner body located below the electric blower,
An electric vacuum cleaner having an opening communicating with the first gap. 2. The electric vacuum cleaner according to claim 1, wherein a recess is formed at a position of the wheel base facing the space, and the space is divided into a plurality of parts.