JP2009045317A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of sufficiently reducing fluid noise propagated by air. <P>SOLUTION: The vacuum cleaner includes an exhaust port 15 for exhausting air sucked by a negative pressure generated in a fan motor 8, a first attenuation plate 26a disposed so that a plate surface faces the advancing direction of the air is provided on the upstream side of the exhaust port 15, and a second attenuation plate 26b disposed similarly to the first attenuation plate 26a is provided on the downstream side of the exhaust port. The first attenuation plate 26a and the second attenuation plate 26b are provided with one or more openings, and the air is exhausted through the openings. A space is provided between the first attenuation plate 26a and the second attenuation plate 26b to form an expansion space 27, the air is contracted when passing through the openings of the first attenuation plate 26a and is expanded when reaching the expansion space 27 and thus acoustic energy is consumed by the process of contraction/expansion. An acoustic material 28 is disposed in the expansion space 27. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner, and more particularly, to a vacuum cleaner having a structure for reducing fluid noise transmitted by air.

  Conventionally, as a technique for reducing the exhaust noise of a vacuum cleaner, “a recess 7 is formed at the rear end of the rear cover 6 and an exhaust hole 8 is provided on the bottom surface of the recess 7. A soundproof plate 9 is disposed so as to face the exhaust hole 8 and to be substantially perpendicular to the exhaust flow passing through the exhaust hole 8, and a plurality of small holes 11 are provided in the inner wall 10 of the soundproof plate 9, Furthermore, by arranging the sound absorbing material 13 between the inner wall 10 and the outer wall 12, the generation of wind noise is reduced, and the exhaust energy is diffused and absorbed by the small holes 11 and the sound absorbing material 13 to promote noise reduction. . Is proposed (Patent Document 1).

JP-A-10-248766 (Summary)

  Noise (fluid noise) contained in the fluid generated by the motor of the vacuum cleaner is radiated directly to the outside of the housing from an exhaust port provided at the rear of the housing. By directly listening to the sound (noise) radiating from the mouth, he was directly exposed to noise damage.

  Thus, for example, as in the technique described in Patent Document 1 described above, there is one that attempts to reduce fluid noise by providing an air passage by a combination of a perforated plate and a sound absorbing material at the exhaust port, but sufficiently attenuates the fast flow velocity. In other words, the perforated plate obstructs the flow of the fluid, and the sound leaks out from the surrounding opening, so that there is a problem that the fluid noise cannot be sufficiently reduced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a vacuum cleaner that can sufficiently reduce fluid noise transmitted by air.

  A vacuum cleaner according to the present invention is a vacuum cleaner that collects dust by generating a negative pressure with a fan motor, and includes an exhaust port for discharging air sucked by the negative pressure generated by the fan motor. A first damping plate is provided on the upstream side of the exhaust port so that the plate surface is opposed to the air traveling direction, and the downstream side of the exhaust port is the same as the first damping plate. A second attenuating plate disposed, and one or a plurality of openings are provided in the first attenuating plate and the second attenuating plate, and air is discharged through the opening, An expansion space is formed by providing a space between the first attenuation plate and the second attenuation plate, and contracts when air passes through the opening of the first attenuation plate, and expands when reaching the expansion space. , Configured to consume acoustic energy through the process of contraction and expansion, It is obtained by arranging the sound absorbing material to the serial expansion space.

  According to the electric vacuum cleaner of the present invention, in addition to the noise reduction effect caused by the air colliding with the first attenuation plate and the second attenuation plate, the acoustic energy is consumed by the process of air contraction / expansion. Furthermore, since the sound absorbing material is disposed in the expansion space, a sufficient noise reduction effect can be obtained even with fluid noise having a high flow velocity.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an overall configuration of the electric vacuum cleaner according to Embodiment 1 of the present invention. FIG. 1A is an overall view, and FIG. 1B is a rear view.
The state where the hose insertion part 2 is connected to the front of the vacuum cleaner main body 1, the extension pipe 4 is connected to the hose proximal part 3, and the suction tool 5 is connected is the normal use state of the vacuum cleaner. .
The vacuum cleaner main body 1 is configured such that an internal configuration is sandwiched between an upper case 6 and a lower case 7.
An exhaust port 15 is provided on the back surface of the vacuum cleaner body 1. The air sucked into the vacuum cleaner main body 1 is configured to be discharged out of the main body through the exhaust port 15.

FIG. 2 is a top sectional view of the electric vacuum cleaner according to the first embodiment.
A dust collection box 12 is housed inside the dust collection chamber 10 in front of the main body. The dust collection chamber 10 and the fan motor 8 are in communication.
At the rear of the main body, the fan motor 8 and the cord winding device 9 are arranged side by side in the horizontal direction. With this arrangement, the central axis of the fan motor 8 and the central line of the main body do not coincide with each other. . This arrangement is for reducing the width of the vacuum cleaner body 1.
Further, the dust collection chamber 10 is covered at its upper portion by a rotatable dust collection lid 11 shown in FIG.

FIG. 3 is a perspective view of the main body 1 of the vacuum cleaner with the dust collection lid 11 opened. Here, a state in which the dust collection box 12 is housed in the dust collection chamber 10 is shown.
The upper part of the dust collection chamber 10 is covered with a rotatable dust collection lid 11, and when the dust collection box 12 is taken out, the dust collection lid 11 is opened.

FIG. 4 is a perspective view showing a state after the dust collection box 12 is taken out.
A grid 13 is provided in the rear side of the dust collection chamber 10 and the portion that communicates with the fan motor 8. The dust collection chamber 10 is blocked from the rear of the main body, and the intake air amount is secured by the grid structure. The

FIG. 5 is a perspective view of the dust collection box 12.
The dust collection box 12 includes a dust suction port 16 at the front and a lid 17 at the rear. Next, the removal of the paper pack will be described with reference to FIGS.

FIG. 6 is a side sectional view of the dust collection box 12. FIG. 6A is an entire side sectional view of the central portion, and FIG. 6B is an enlarged view of a part thereof.
In FIG. 6, the holder 18 is connected to the button 20 via a connecting rod 19.
A filter 21 is disposed on the lid body 17.
A paper pack for collecting and collecting dust is disposed in the <place paper pack> portion of FIG. Reference numeral 23 denotes a paper pack mount. The paper pack is fixed in the dust collection box 12 using the paper pack mount 23 as a side pedestal.
The holder 18 is urged in a direction to sandwich the paper pack mount 23 by a push spring (not shown).
The lid 17 and the button 20 are fixed by the claw 24 and the button opening 25 so that the lid 17 is closed.

FIG. 7 shows a state when the button 20 is pressed a little from the state of FIG.
When the button 20 is pressed, the engagement between the claw 24 and the button opening 25 is released, and the lid 17 is in the open state.

FIG. 8 shows a state when the button 20 is further pressed from the state of FIG.
When the button 20 is further pressed, the lid 17 is completely released from the engagement between the claw 24 and the button opening 25, and the rear portion of the dust collection box 12 is opened.

FIG. 9 shows a state when the button 20 is further pressed from the state of FIG.
When the button 20 is pressed further deeply, the holder 18 is actuated via the connecting rod 19, and the paper pack mount 23 held by the holder 18 falls down from the dust collection box 12 and is fixed to the paper. The pack can be taken out.

  After the cleaning is completed, the user opens the dust collection lid 11, takes out the dust collection box 12 from the dust collection chamber 10, and discards the paper pack.

  Heretofore, the overall configuration of the electric vacuum cleaner according to the first embodiment has been described. Next, a configuration related to reduction of fluid noise through which air propagates will be described.

FIG. 10 is a side sectional view of the electric vacuum cleaner according to the first embodiment and a diagram showing the air flow.
An exhaust air passage 14 for discharging air sucked by the fan motor 8 is provided at the lower rear portion of the electric vacuum cleaner main body 1.
The exhaust air passage 14 is an air passage extending from the lower rear portion of the electric vacuum cleaner main body 1 toward the back surface.
Air sucked by the fan motor 8 is guided by a wall surrounding the fan motor 8 to reach the exhaust air passage 14 at the lower rear of the main body, passes through the exhaust air passage 14, and is provided on the back surface of the vacuum cleaner main body 1. It is discharged from the exhaust port 15.

The exhaust port 15 is provided with a first attenuation plate 26a on the upstream side and a second attenuation plate 26b on the downstream side with respect to the air traveling direction. Both the first attenuation plate 26a and the second attenuation plate 26b are arranged upright in the vertical direction so that the plate surfaces face the traveling direction of air.
The first attenuation plate 26a and the second attenuation plate 26b are provided with one or a plurality of openings through which air passes.

  The space surrounded by the first attenuation plate 26a and the second attenuation plate 26b is closed up and down by walls, and the air that has passed through the exhaust air flow path 14 flows into this space from the opening of the first attenuation plate 26a. The second damping plate 26b is discharged from the opening. Hereinafter, this space is referred to as an expansion space 27.

  The opening area of the opening of the first attenuation plate 26 a is formed smaller than the cross-sectional area of the exhaust air passage 14. The opening area of the opening of the second attenuation plate 26 b is formed smaller than the cross-sectional area of the expansion space 27.

  A sound absorbing material 28 is disposed in the expansion space 27. The fibers constituting the sound absorbing material 28 can be formed of, for example, a PET material or a nonwoven fabric.

  Next, the operation of the electric vacuum cleaner according to the first embodiment will be described.

The fan motor 8 built in the main body 1 of the vacuum cleaner generates negative pressure in the dust collection chamber 10 and sucks dust from the suction tool 5, and sucks dust into the paper pack attached in the dust collection box 12. Collect.
At this time, the air sucked by the fan motor 8 passes through the paper pack, the filter 21, the lattice 13, and the fan motor 8 in this order, and reaches the exhaust port 15 through the exhaust air passage 14.

The air that has reached the exhaust port 15 first collides with the first attenuation plate 26a, thereby attenuating the acoustic energy.
Next, air flows from the opening of the first attenuation plate 26a toward the expansion space 27. At this time, since the opening area of the opening is formed smaller than the cross-sectional area of the exhaust air passage 14, the air Contracts.
When the contracted air reaches the expansion space 27, the air expands because the cross-sectional area is now larger than the opening.
Through such a contraction / expansion process, acoustic energy is consumed and fluid noise is reduced.

  In addition, since the sound absorbing material 28 is disposed in the expansion space 27, acoustic energy is converted into heat energy or the like by the sound absorbing effect of the sound absorbing material 28. Thereby, the fluid noise is further reduced.

Next, the air travels from the expansion space 27 toward the second attenuation plate 26b, collides with the second attenuation plate 26b, and the acoustic energy is attenuated.
Further, since the opening area of the opening of the second attenuation plate 26b is smaller than the expansion space 27, the air expanded in the expansion space 27 contracts again when passing through the opening of the second attenuation plate 26b. And expands when discharged.
Again, through the contraction / expansion process, acoustic energy is consumed and fluid noise is reduced.

As described above, according to the first embodiment, the first attenuation plate 26a and the second attenuation plate 26b are provided in the exhaust port 15, and are arranged vertically so that the plate surfaces face the air traveling direction. Therefore, the air that has passed through the exhaust air passage 14 collides with each of the attenuation plates and consumes acoustic energy.
Therefore, the effect of reducing the fluid noise by these attenuation plates can be exhibited.

  Further, an expansion space 27 is formed between the first attenuation plate 26a and the second attenuation plate 26b, and the acoustic energy is consumed by undergoing a contraction / expansion process when air passes through each opening or expansion space. Since it comprised as mentioned above, the reduction effect of the further fluid noise can be exhibited.

  In addition, since the sound absorbing material 28 is disposed in the expansion space 27, the acoustic energy is consumed by converting the acoustic energy into heat energy or the like, and thereby the effect of reducing fluid noise can be exhibited.

Embodiment 2. FIG.
FIG. 11 is a side sectional view of the electric vacuum cleaner according to Embodiment 2 of the present invention and a diagram showing the air flow. In the second embodiment, the configuration of the attenuation plate is different from that of the first embodiment. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

In FIG. 11, the first attenuation plate 26 a is formed in an armor door shape in which a plurality of thin plates are arranged obliquely downward.
The air that has reached the first attenuation plate 26a travels through the ventilation holes formed between the thin plates of the first attenuation plate 26a formed in the shape of an armor door. For this reason, the air cannot travel straight through the ventilation hole of the first attenuation plate 26a, but travels diffracting while colliding with each thin plate.

As described above, since the first attenuation plate 26a has a structure in which the air cannot travel straight, the traveling length of the air increases, so that the fluid noise is attenuated accordingly.
Moreover, since air always collides with one of the thin plates when passing through the first attenuation plate 26a, acoustic energy is consumed by the collision, and a further noise reduction effect can be expected.
In this regard, in the first embodiment, the air passing through the opening passes straight through the first attenuation plate 26a. Therefore, compared with this, the configuration of the second embodiment is more effective in reducing the noise caused by the collision. It can be said that it can be further demonstrated.

FIG. 12 is an enlarged side sectional view of the exhaust port 15.
Each thin plate constituting the first attenuation plate 26a is formed in a lightning-like corrugated shape bent at a substantially right angle. By forming in this way, the shape of the vent hole is diffracted at a right angle, so that the air collides with each thin plate almost in front, and the noise reduction effect is ensured.

In FIGS. 11 to 12, the wave shape is bent only once. However, the present invention is not limited to this, and the wave shape may be waved a plurality of times.
In addition, the shape of each thin plate is not limited to the corrugated shape, and for example, even if the first attenuation plate 26a is formed in the shape of an armored door with a flat plate-like shape, air diffraction progress and collision attenuation occur in the same manner. A certain noise reduction effect can be obtained.

  Moreover, in FIGS. 11-12, although the example which formed only the 1st attenuation board 26a in the armor door shape was shown, even if it forms the 2nd attenuation board 26b in the armor door shape, the same noise reduction effect is acquired, If both the first attenuation plate 26a and the second attenuation plate 26b are formed in the shape of an armored door, the maximum noise reduction effect is exhibited.

In addition, although it has been described that the attenuation plate is composed of a thin plate formed in the shape of an armored door, it is described in this manner for convenience of explanation, and it is not always necessary to configure the armored door with a thin plate, and air diffracts Any configuration may be used.
For example, a plurality of corrugated blocks may be disposed obliquely downward.

  As described above, according to the second embodiment, by forming the attenuation plate in the shape of an armor door, the air diffracts and travels along each thin plate that forms the armor door. The rotation sound of the fan motor 8 or the like) does not leak directly to the outside of the vacuum cleaner, and therefore noise can be reduced.

  In addition, since the air path is bent (substantially) at right angles, the wind speed is greatly reduced, and the effect of the sound absorbing material 28 in the expansion space 27 can be maximized. This is because the effect of the sound absorbing material 28 is more likely to be exhibited as the wind speed is generally slower.

  Further, it is possible to exhibit a damping effect due to the length of the air passage and a noise reduction effect due to a collision with each thin plate forming the armor door.

Embodiment 3 FIG.
FIG. 13 is a side sectional view of an electric vacuum cleaner according to Embodiment 3 of the present invention and a diagram showing an air flow. Since the configuration of the electric vacuum cleaner according to the third embodiment is the same as the configuration of the first and second embodiments except for the configuration of the sound absorbing material 28, the description of other parts is omitted.
Note that FIG. 13 shows the same structure as that of the first embodiment.

  As shown in FIG. 13, the laminated surface direction of the fibers forming the sound absorbing material 28 is formed so as to be substantially parallel to the air traveling direction.

FIG. 14 is a perspective view of the sound absorbing material 28.
In the third embodiment, the sound absorbing material 28 is disposed so that the out-of-plane direction (thickness direction) is substantially parallel to the air traveling direction. Furthermore, the fiber arrangement of the sound absorbing material 28 is perpendicular to the cut surface of the sound absorbing material 28.
That is, in the third embodiment, the arrangement of the fibers of the sound absorbing material 28 is formed to be parallel to the out-of-plane direction (thickness direction) and the air flow.

Embodiments 1 and 2 are compared with Embodiment 3 for this fiber arrangement.
In the first and second embodiments, as shown in FIG. 14A, the arrangement of the fibers is in the horizontal direction with respect to the cut surface of the sound absorbing material 28, and therefore the fiber surface of the sound absorbing material 28 is in the flow of air. It comes to oppose.
On the other hand, in the third embodiment, as shown in FIG. 14 (b), the arrangement of the fibers is perpendicular to the cut surface of the sound absorbing material 28. Therefore, the fibers of the sound absorbing material 28 are in the flow of air. It has a structure that allows air to pass through without facing each other.

  Thus, by using the fiber structure as shown in FIGS. 13 to 14 for the sound absorbing material 28, the noise reduction effect can be exhibited without reducing the intake efficiency of the vacuum cleaner.

In the above first to third embodiments, the configuration in which the sound absorbing material 28 is disposed in the expansion space 27 of the exhaust port 15 has been described, but even if the sound absorbing material 28 is disposed in other places through which air passes, A similar noise reduction effect can be obtained.
At this time, it is desirable to arrange the sound absorbing material 28 so that the traveling direction of the air is parallel to the fiber lamination surface of the sound absorbing material 28.

As described above, according to the third embodiment, the laminated surface direction of the fibers forming the sound absorbing material 28 is formed so as to be substantially parallel to the air traveling direction. The direction becomes substantially parallel to the air traveling direction, and air easily passes through the sound absorbing material 28, and the load on the fan motor 8 is reduced.
Therefore, the noise reduction effect can be exhibited without reducing the suction force of the vacuum cleaner.

Embodiment 4 FIG.
FIG. 15 is a side sectional view of an electric vacuum cleaner according to Embodiment 4 of the present invention and a diagram showing an air flow. Since the configuration of the electric vacuum cleaner according to the fourth embodiment is the same as the configuration of the first to third embodiments except for the configuration of the sound absorbing material 28, the description of other parts is omitted.
In FIG. 15, the same structure as that of the first embodiment is used.

When the electric vacuum cleaner is operated, vibration is generated from the fan motor 8 or the like. At this time, if there is backlash at the time of attachment to the first attenuation plate 26a or the second attenuation plate 26b, resonance may occur and noise may be generated.
Therefore, in the fourth embodiment, the sound absorbing material 28 is disposed so as to contact the first attenuation plate 26a and the second attenuation plate 26b. Thereby, since the sound absorbing material 28 absorbs the vibration of the first attenuation plate 26a or the second attenuation plate 26b, no noise is generated.

For example, the arrangement of the sound absorbing material 28 can be considered as follows.
(1) The sound absorbing material 28 is filled and arranged so as to fill the expansion space 27.
(2) The sound absorbing material 28 is fixed so as to be attached to the first attenuation plate 26a or the second attenuation plate 26b.

  Even with such a simple contact, the vibration noise is sufficiently reduced, so that it is possible to reliably suppress the vibration noise without using a special fixture or the like.

It is a figure which shows the whole structure of the vacuum cleaner which concerns on Embodiment 1. FIG. 3 is a top sectional view of the electric vacuum cleaner according to Embodiment 1. FIG. It is a perspective view of the vacuum cleaner main body 1 in the state where the dust collection lid 11 is opened. It is a perspective view which shows the mode after taking out the dust collection box. 3 is a perspective view of a dust collection box 12. FIG. 4 is a side sectional view of the dust collection box 12. FIG. The state when the button 20 is pushed a little from the state of FIG. 6 is shown. The state when the button 20 is further pressed from the state of FIG. 7 is shown. The state when the button 20 is further pushed from the state of FIG. 8 is shown. It is a figure which shows the side sectional view of the electric vacuum cleaner which concerns on Embodiment 1, and the flow of air. It is a figure which shows the side sectional view of the electric vacuum cleaner which concerns on Embodiment 2, and the flow of air. 2 is an enlarged side cross-sectional view of an exhaust port 15. FIG. It is a figure which shows the sectional side view of the electric vacuum cleaner which concerns on Embodiment 3, and the flow of air. 3 is a perspective view of a sound absorbing material 28. FIG. It is a figure which shows the sectional side view of the electric vacuum cleaner which concerns on Embodiment 4, and the flow of air.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body, 2 Hose insertion part, 3 Hose hand part, 4 Extension pipe, 5 Suction tool, 6 Upper case, 7 Lower case, 8 Fan motor, 9 Cord winding device, 10 Dust collection chamber, 11 Collection Dust cover, 12 Dust collection box, 13 Lattice, 14 Exhaust air channel, 15 Exhaust port, 16 Dust dust intake port, 17 Cover, 18 Holder, 19 Connecting rod, 20 Button, 21 Filter, 23 Paper pack mount, 24 Claw, 25 Button opening, 26a 1st damping plate, 26b 2nd damping plate, 27 expansion space, 28 sound absorbing material.

Claims (5)

A vacuum cleaner that collects dust by generating negative pressure with a fan motor,
An exhaust port for discharging air sucked by the negative pressure generated by the fan motor;
Provided on the upstream side of the exhaust port is a first damping plate disposed so that the plate surface faces the air traveling direction;
Provided on the downstream side of the exhaust port is a second attenuation plate arranged in the same manner as the first attenuation plate,
One or more openings are provided in the first attenuation plate and the second attenuation plate, and air is configured to be exhausted through the openings,
Providing a space between the first attenuation plate and the second attenuation plate to form an expansion space;
The air contracts when passing through the opening of the first attenuation plate, and expands when reaching the expansion space, so that the acoustic energy is consumed by the contraction / expansion process,
A vacuum cleaner comprising a sound absorbing material disposed in the expansion space. The first attenuation plate or the second attenuation plate or both of them are formed in an armor-door shape,
The vacuum cleaner according to claim 1, wherein air is configured to diffract by colliding with a plate formed in an armor door shape. The vacuum cleaner according to claim 2, wherein each of the plates formed in an armor-door shape is formed in a lightning-like wave shape bent substantially at a right angle. The sound absorbing material is
The vacuum cleaner according to any one of claims 1 to 3, wherein the direction in which the fibers are laminated is substantially parallel to the air flow. The sound absorbing material is
The vacuum cleaner according to any one of claims 1 to 4, wherein the vacuum cleaner is disposed so as to contact the first attenuation plate and the second attenuation plate.

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