JP3319646B2 - Vacuum cleaner silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for a vacuum cleaner, which is capable of further reducing noise during operation.

[0002]

2. Description of the Related Art Heretofore, as means for reducing operation, for example, a fan drive as a sound source is provided by a sound absorbing material such as felt, urethane foam having open cells, or a sound insulating material formed of high-density paper. Means are adopted to surround the periphery of the part or to arrange a sound absorbing material in the exhaust air path to absorb or block sound.

[0003]

In a conventional noise reduction device for reducing noise, it is necessary to provide a large number of noise reduction materials such as a sound absorbing material and a sound insulating material in order to realize a more quiet operation. .

[0004] When a large number of silencers are provided, the noise reduction efficiency is increased, but the air path resistance increases in accordance with the number of silencers, and a new problem such as a remarkable decrease in suction performance is caused. Alternatively, since the size of the vacuum cleaner body is limited, it is impossible to install many silencers, and there is a limit in reducing noise.

Accordingly, an object of the present invention is to provide a muffler for a vacuum cleaner capable of further reducing the operation noise without impairing the suction performance.

[0006]

According to the present invention, an electric blower and a dust filter are incorporated in a cleaner body having an exhaust port at the rear, and the dust filter is used for the filter. In a vacuum cleaner configured to discharge excess air to the outside through the exhaust port, a resonance type including a resonance chamber, and a guide duct for guiding the resonance chamber toward the resonance port provided in the resonance chamber is provided at the exhaust port. A muffler is detachably mounted, and a front duct wall of the guide duct is formed by a main body wall of the cleaner body.

Further, a sound absorbing material for absorbing a high frequency band may be provided in an induction duct of the resonance type silencer, or a front wall of a resonance chamber facing the sound absorbing material may be formed into a corrugated plate. is there. Alternatively, as a preferred embodiment of the resonance type silencer, a resonance type silencer including an induction duct and a resonance chamber is detachably attached to an exhaust port of the cleaner body, and the resonance chamber is provided at one end of the resonance chamber. Wide resonance mouth side,
The guide duct is formed so as to gradually narrow toward the other end, and a plurality of guide ports are arranged in the vertical direction so that the resonance ports are alternately arranged left and right, while a guide duct for guiding exhaust sound toward the left and right resonance ports is provided. Is constituted by the main body wall surface of the cleaner body.

[0008] Further, one end side provided with the resonance port is wide,
Along with narrowing sequentially toward the other end, a plurality of resonance chambers arranged vertically so that the resonance ports are alternately arranged left and right,
A unit-type resonance type comprising coupling means detachably coupled to the cleaner body and partition plates for guiding and guiding the exhaust sound discharged from the exhaust port of the cleaner body to the left and right resonance ports, respectively. A silencer.

[0009]

According to this vacuum cleaner, a resonance type silencer is attached to the exhaust port of the main body of the vacuum cleaner, so that the exhaust sound from the exhaust port can be reduced to a level near zero at the resonance port boundary. Is generated, the exhaust noise around the resonance frequency in the resonance chamber is reduced, and the operation noise can be reduced.

On the other hand, when the exhaust sound in a high frequency range outside the resonance frequency range of the resonance chamber passes through the sound absorbing material provided in the induction duct and collides with the front wall surface of the resonance chamber, it becomes a standing wave and is reflected. Then, the reflected standing wave is reliably absorbed by the sound absorbing material, and the operating noise is suppressed to a small level.

At this time, the portion of the standing wave having the largest amplitude coincides with the position of the sound absorbing material due to the corrugated plate shape, and efficient absorption is performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS.

FIG. 1 shows an overall view of a vacuum cleaner,
In the drawing, reference numeral 1 denotes a horizontally long cleaner body, and reference numeral 3 denotes moving wheels attached to the cleaner body 1, respectively. A dust suction hose 9 having a dust suction port 7 is detachably connected to the front connection port 5 of the cleaner body 1.
The rear surface has a plurality of exhaust ports 11 formed in a slit shape.
Is provided.

A dust collecting filter 13 is provided in the front of the interior of the cleaner body 1, and an electric blower 15 is provided in the rear. The electric blower 15 is a motor 1 serving as a fan drive unit.
7 and a centrifugal fan 19 to which rotational power is given by a motor 17.

The electric blower 15 has a motor cover surrounding the motor 17 and a fan cover 21 surrounding the fan 19 so that operating noise leaking outside is suppressed to a small level.

On the other hand, a resonance type silencer 23 is detachably attached to the exhaust port 11 of the cleaner body 1.

The resonance type silencer 23 includes a resonance chamber 27 provided with a resonance port 25 and a resonance port 25 provided in the resonance chamber 27.
It is of a side branch type comprising an induction duct 29 for inducing exhaust sound to the outside, and has a unit structure set to have dimensions substantially equal to the width and height of the cleaner body 1.

As shown in FIG. 3, an even number of resonance chambers 27, for example, six, are formed in the vertical direction, and one end of the resonance chamber 27 is provided with the resonance port 25 described above. The resonance chamber 27 has a shape in which one end provided with the resonance port 25 is wide and narrows toward the other end. The resonance port 25 of the uppermost resonance chamber 27 is on the left side, and the resonance port 25 of the second resonance chamber 27 is on the left side. The resonance port 25 has a layout structure in which the resonance ports 25 are alternately arranged such that the resonance port 25 is on the right side and the resonance port 25 of the third resonance chamber 27 is on the left side.

As a result, the resonance ports 25 of the uppermost, third and fifth resonance chambers 27 are arranged on the left side in a state of being close to each other. Also, the second, fourth and sixth resonance chambers 25
Are arranged on the right side in a close state, and a resonance area without dead space is secured from the resonance port 25 of each resonance chamber 27 to the resonance port 25.

While three resonance ports 25 are provided vertically, for example, the length L and the volume V of the resonance space of the resonance chamber 27 are determined by the resonance frequency corresponding to the exhaust sound.

The induction duct 29 includes an upper plate 31 extending forward from the ceiling surface of the resonance room 27, a lower plate 33 extending forward from the bottom surface of the resonance room 27, and a partition plate 35 that partitions the resonance room 27 left and right. And the front duct wall is omitted.

That is, when the induction duct 29 is attached to the rear wall 1a of the cleaner body 1, the rear wall 1a also serves as a front duct wall, and as shown in FIG.
5 through.

At the front edges of the upper plate 31 and the lower plate 33 of the guide duct 29, connecting claws 37, 37 serving as a pair of right and left connecting means are provided.
Is provided, and can be detachably connected to engagement holes 39, 39 provided in the rear wall surface 1a of the cleaner body 1.

According to the electric vacuum cleaner configured as described above, the resonance type silencer 23 can be mounted by inserting the coupling claw 37 into the engagement hole 39.

Accordingly, by providing the engagement hole 39 on the rear wall 1a of the cleaner main body 1 of each product, the resonance type silencer 23 can be attached or removed as required, if necessary. .

On the other hand, when the resonance type silencer 23 is attached, the exhaust sound is exhausted from the exhaust port 11 by the operation of the electric blower 15. The exhaust sound is divided into right and left by the partition plate 35 and passes through the resonance ports 25, 25. At the time of passing through the resonance port 25, resonance occurs such that the exhaust sound at the boundary of the resonance port 25 becomes close to zero, and the exhaust sound centered on the resonance frequency in the resonance chamber 27 decreases,
Operation noise can be further reduced.

FIG. 4 shows an embodiment in which a high-frequency region that cannot be absorbed by the resonance type silencer 23 can be silenced.

That is, in front of the resonance chamber 27, the induction duct 2
9, a sound absorbing material 41 made of a material such as felt is arranged.

As shown in FIG. 5, the position D of the sound absorbing material 41 is positioned so as to be a portion a having the largest amplitude of the standing wave reflected from the front wall surface 27a of the resonance chamber 27.

According to this embodiment, the high-frequency range in which the sound cannot be completely eliminated in the resonance chamber 27 passes through the sound absorbing material 41 and passes through the resonance chamber 27.
The reflected standing wave is efficiently absorbed by the sound absorbing material 41 and is attenuated when reflected by the front wall surface 27a.

In this case, as shown in FIG.
The front wall surface 27a of the
Since the position from to the sound absorbing material 41 changes, for example, the rotation speed of the motor 17 changes depending on conditions such as a load, and it is possible to cope with a change in the frequency of the noise generated from the motor 17. It is possible to secure a wide sound absorption area in the region.

The connecting means comprises a connecting claw 37 and a connecting hole 3.
Although it has a relationship with No. 9, a band type, a hook type, etc. may be appropriately implemented.

[0033]

As described above, according to the present invention, the resonance type silencer can be used with or without the resonance type silencer, if necessary.

In particular, when the resonance type silencer is mounted, the operation noise during operation can be further reduced.

Further, since the front duct wall of the guide duct of the resonance type silencer uses the main body wall surface of the cleaner body, the structure can be simplified and can be mounted compactly.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a whole vacuum cleaner embodying the present invention.

FIG. 2 is a perspective view of a resonance type silencer.

FIG. 3 is a front view of a part of the resonance type silencer.

FIG. 4 is a cut-away plan view in which a sound absorbing material is provided in an induction duct.

FIG. 5 is an operation explanatory diagram of FIG. 4;

FIG. 6 is a cut-away plan view similar to FIG. 4 in which the front wall surface of the resonance chamber has a corrugated plate shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 1a Rear wall surface (main body wall surface) 11 Exhaust port 13 Dust collection filter 15 Electric blower 23 Resonance type silencer 25 Resonance port 27 Resonance room 29 Induction duct

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-35478 (JP, A) JP-A-56-165850 (JP, A) JP-A-57-179344 (JP, U) JP-A-62 177462 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47L 5/00-9/00

Claims (5)

(57) [Claims] 1. A cleaner body having an exhaust port at the rear,
An electric vacuum cleaner having a built-in electric blower and a dust collecting filter, and configured to discharge air filtered by the dust collecting filter to the outside from the exhaust port, wherein the exhaust port is provided with a resonance chamber and a resonance chamber. A suction type muffler comprising a guide duct for guiding the guide toward the resonance port, which is detachably attached, and wherein a front duct wall of the guide duct is constituted by a main body wall of the cleaner body. Silencer. 2. A sound absorbing material for absorbing a high frequency band is provided in an induction duct of a resonance type silencer.
Vacuum cleaner as described. 3. A sound absorbing material for absorbing a high frequency band is provided in an induction duct of a resonance type silencer, and a front wall of a resonance chamber facing the sound absorbing material has a corrugated plate shape. Item 6. A muffler for a vacuum cleaner according to Item 1. 4. A cleaner body having an exhaust port at the rear,
A vacuum cleaner having a built-in electric blower and a dust filter, wherein the air filtered by the dust filter is discharged from the exhaust port to the outside, wherein the exhaust port has a resonance type including an induction duct and a resonance chamber. The silencer is detachably attached, the resonance chamber is formed so that the resonance port side provided at one end of the resonance chamber is wide and narrows gradually toward the other end, and the resonance chamber is vertically arranged so that the resonance ports are alternately arranged left and right. In the vacuum cleaner, a plurality of guide ducts are arranged in the direction, and a guide duct for guiding exhaust sound toward the left and right resonance ports is provided, and a front duct wall of the guide duct is formed by a main body wall of the cleaner body. Silencer. 5. A cleaner main body comprising: a resonance chamber provided with a resonance port provided at one end side thereof is wide and narrows toward the other end; A resonance type of a vacuum cleaner having a coupling means detachably coupled, and a partition plate for guiding and guiding the exhaust sound discharged from the exhaust port of the cleaner body to the left and right resonance ports. Silencer silencer.