JP2009219853A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the aging degradation of the sound reduction performance of the vacuum cleaner, by controlling adhesion of the dust to the acoustic material and restraining the degradation of the acoustic material, and also removing dust from the sound reduction part. <P>SOLUTION: The vacuum cleaner is equipped with a cleaner body 1 including an electric blower 2 for making negative pressure act on a dust collecting part, a suction opening body 3 for sucking up dust, a suction pipe 6 which connects the suction opening body 3 to the cleaner body 1, and a sound reduction part 20 of the sound absorption type arranged to the suction pipe 6 and made of a sound absorption material 24. The sound reduction part 20 includes a sound reduction part inner wall 22 on which a plurality of holes 21 are arranged at the region which becomes a loop in the interior acoustic mode of the suction pipe 6, and a sound reduction part outer wall 23 arranged to cover the plurality of holes 21. An air space layer 25 is arranged between the sound reduction part inner wall 22 and the sound reduction part outer wall and a sound absorption material 24 is installed there. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner provided with a sound absorption type silencer that reduces suction sound during cleaning.

  When cleaning using an electric vacuum cleaner, airflow is induced from the floor suction tool to the vacuum cleaner body through the extension pipe and the bellows-like hose body due to the negative pressure generated by the electric blower. At that time, fluid noise is generated along with the disturbance of the airflow in the floor suction tool, and unpleasant noise is radiated from the suction port of the suction tool and the cleaner body. As a method for reducing the suction sound in such a vacuum cleaner, a resonance-type silencer and a sound-absorbing silencer using a sound-absorbing material are collectively referred to as suction pipes (extended pipes and bellows-like hose bodies are called suction pipes). ) (See, for example, Patent Document 1).

JP-A-5-220072 (page 2-3, FIGS. 1 and 8)

  However, when a vacuum cleaner with a silencer in the suction pipe is used for a long period of time, when an air flow is induced from the floor suction tool to the vacuum cleaner body through the extension pipe and the bellows hose body, the inner wall of the silencer Since the airflow flows into the silencer from the hole in the silencer, dust accumulates in the silencer, or the sound-absorbing material installed along the inner wall of the silencer degrades the silencing performance over time. There was a problem that it would end up.

  The present invention has been made in view of the above problems, and a first object of the present invention is to suppress adhesion of dust to the sound absorbing material to suppress performance deterioration of the sound absorbing material, and a second object is to The purpose of the present invention is to prevent aging deterioration of the silencer performance of the vacuum cleaner by removing dust from the silencer.

  The vacuum cleaner according to the present invention includes a vacuum cleaner body including an electric blower that applies a negative pressure to a dust collecting portion, a suction port body that sucks dust, and a suction port that connects the vacuum cleaner body and the suction port body. A vacuum cleaner comprising a tube and a sound absorption type silencer using a sound absorbing material provided in the suction tube, wherein the silencer is provided in a plurality of portions that become the belly of the internal acoustic mode of the suction tube. A silencer inner wall provided with a plurality of holes and a silencer outer wall provided so as to cover the plurality of holes, and the sound absorbing material is installed with a space layer between the silencer inner wall and is there.

  The silencer of the vacuum cleaner of the present invention includes a silencer inner wall provided with a plurality of holes in a portion that becomes the belly of the internal acoustic mode of the suction pipe, and a silencer outer wall provided so as to cover the plurality of holes. Since the sound absorbing material is provided with a space layer between the inner wall of the silencer, the adhesion of dust to the sound absorbing material can be suppressed, and the sound absorbing performance of the vacuum cleaner can be maintained over a long period of time. Can do.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

Embodiment 1 FIG.
1 to 4 show a vacuum cleaner provided with a muffler according to Embodiment 1 of the present invention. FIG. 1 is a perspective view of the vacuum cleaner according to Embodiment 1, and FIG. FIG. 3 is a cross-sectional view of the muffler part of FIG. 2, and FIG. 4 is a cross-sectional view taken along line AA of FIG.
This vacuum cleaner mainly connects the vacuum cleaner main body 1 incorporating the electric blower 2, the suction port body 3 including the floor suction tool 3 a for sucking dust, the vacuum cleaner main body 1 and the suction port body 3. A bellows-like hose body 4 and a suction pipe 6 including an extension pipe 5 are provided. In addition to the electric blower 2 described above, a dust collection unit (not shown) is installed inside the vacuum cleaner main body 1, and the electric blower 2 applies a negative pressure to the dust collection unit to remove dust from the suction port 3. Dust is collected in the dust collection part in the cleaner body 1 through the suction and suction pipe 6.

  The hose body 4 is made of a bellows-like hose member that can be freely bent, and the base end side connection portion of the hose body 4 is detachably connected to a main body suction port 7 provided at the front center portion of the cleaner body 1. The connecting portion is detachably connected to one end portion of the extendable extension tube 5. The other end (front end) of the extension pipe 5 is detachably connected to the floor suction tool 3a. Further, an operation unit 8 is provided on the distal end side connection part of the hose body 3 so that the operation mode of the electric blower 2 in the cleaner body 1 can be selected. The operation unit 8 is provided with a plurality of setting switches 9 for setting the drive of the electric blower 2 and the like to a predetermined state, and a grip unit 10 is formed for the operator to grip when cleaning.

The silencer 20 in the present embodiment is a sound-absorbing silencer using a sound-absorbing material 24, and a suction pipe 6 (the hose body 4 and the hose body 4) that connects the main body suction port 7 and the suction port body 3 of the cleaner body 1. The hollow tube member made of the extension tube 5 is provided at a portion that becomes the antinode of the internal acoustic mode.
Here, when the suction pipe 6 is an acoustic pipe having a length L opened at both ends, a theoretical formula showing a portion that becomes an antinode of the acoustic mode is expressed by the following formula.
u (t, x) = (P0 / ρc sin kL) · cosk (L−x) · cos (ωt + ψ) (1)
Where u is the sound particle velocity, t is the time, x is the position in the tube, ρc is the impedance of the air, k is the wavelength constant, L is the length of the tube, and P0 and ψ are constants.
Therefore, the antinode of the acoustic mode is a portion of kL = mπ (mode m = 1, 2, 3,...) Where sinkL = 0.
The suction sound in a vacuum cleaner generally includes a high frequency of about 1000 Hz to 1500 Hz, and such high frequency sound pressure energy tends to concentrate at both ends of the tube.
Therefore, in order to reduce the high-frequency suction sound, in the present embodiment, a silencer 20 is installed at the end of the suction pipe 6 (extension pipe 5) as shown in FIG. In addition, although illustration is abbreviate | omitted, you may install the muffling part 20 in the other edge part of the suction pipe 6, ie, the connection part vicinity with the main body inlet 7 of the hose body 4.

  As shown in FIGS. 3 and 4, the muffler 20 covers the muffler inner wall 22 in which a plurality of holes 21 are provided in a portion of the suction pipe 6 that becomes the belly of the internal acoustic mode, and the plurality of holes 21. The sound-absorbing part outer wall 23 is provided outside, and the sound-absorbing material 24 is provided with a space layer 25 provided between the sound-absorbing part inner wall 22. In addition, although the silencing part 20 is shown by the circular cross section in FIG. 4, it is not restricted to a circular cross section, The silencing part inner wall 22 and the silencing part outer wall 23 are partially formed in an arc-shaped cross-sectional shape. Also good. The silencer outer wall 23 is fixed on the silencer inner wall 22 by screws, bonding, or other fixing means. The space layer 25 is also a sound deadening space, and in order to suppress the adhesion of dust to the sound absorbing material 24, it is sufficient that the thickness is at least 1 mm. The silencer outer wall 23 is provided with end plates 26 and 27 for holding the both ends of the sound absorbing material 24 in the front and rear. The hole 21 is a resonance hole, and is in acoustic communication with the flow path in the suction pipe 6 and the space layer 25. The diameter of the hole 21 is about 2 to 3 mm. The shape of the hole 21 is not particularly limited, such as a circle or a square. The sound absorbing material 24 is not particularly limited as long as it has a sound absorbing effect, for example, a urethane foam material or a felt-like fiber material. It is also desirable to provide an outer space layer 28 between the sound deadening portion outer wall 23 and the sound absorbing material 24.

  When cleaning is performed using the electric vacuum cleaner configured as described above, an air flow is generated from the floor suction tool 3a to the vacuum cleaner main body 1 through the extension pipe 5 and the bellows-like hose body 4 due to the negative pressure generated by the electric blower 2. Induced. At that time, fluid noise is generated due to disturbance of the airflow in the floor suction tool 3a, and unpleasant noise is radiated from the suction port (not shown) of the floor suction tool 3a and the vacuum cleaner main body 1. Since the internal sound absorbing material 24 absorbs noise by providing the portion 20, unpleasant noise is reduced.

In the present embodiment, the sound absorbing material 24 is installed at a substantially intermediate position between the silencer inner wall 22 provided with a plurality of holes 21 and the silencer outer wall 23, so that a space layer is formed between the silencer inner wall 22. 25 is provided, the adhesion of dust to the sound absorbing material 24 is suppressed, and the sound absorbing performance can be maintained over a long period of time.
Therefore, even if the vacuum cleaner is used for a long period of time, the sound absorbing material is less contaminated with dust and the sound absorbing effect is kept constant, so that the low noise performance of the vacuum cleaner can be maintained for a long period of time.

Embodiment 2. FIG.
FIG. 5 is a front view of the silencer of the electric vacuum cleaner according to Embodiment 2 of the present invention, and FIG. 6 is a cross-sectional view of the silencer of FIG. The vacuum cleaner of the present embodiment is the same as that shown in FIG. In addition, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
In the first embodiment, a silencer having a plurality of holes 21 provided directly on the pipe wall of the suction pipe 6 (extension pipe 5), the pipe wall serving as a silencer inner wall 22, and a sound absorbing material 24 installed therein. The sound absorbing type silencer 20 is configured by attaching the outer wall 23 as a cover member. In the present embodiment, for example, the silencer is connected to the connecting part (or connecting pipe) 29 that removably connects the extension pipes 5 to each other. A portion 20 is provided.

That is, the connection part (or connection pipe) 29 may be formed integrally with one extension pipe 5 on one side, or may be configured to be detachable from both extension pipes 5 at both ends. A pipe wall of such a connection part (or connection pipe) 29 is used as a muffler inner wall 22, and a plurality of holes 21 are provided in the pipe wall. As described above, the position where the hole 21 is provided is a position which becomes an antinode of the acoustic mode.
The silencer outer wall 23 is formed to have a small diameter so that, for example, the expanded outer shape surface is reduced to be substantially the same as the inner diameter dimension of the extension tube 5, and the tip portion thereof is closely fitted in the extension tube 5. The As a result, the connection part (or connection pipe) 29 having the muffler part 20 can be attached to and detached from the extension pipe 5 or removed from the extension pipe 5.

  In this way, by configuring the connection part (or connection pipe) 29 having the muffling part 20 to be detachable or removable, the same effect as that of the first embodiment is obtained, and the outer diameter of the muffling part 20 is narrower. When cleaning a place, it becomes possible to clean by removing the connecting portion (or connecting pipe) 29 having the muffling portion 20, and the convenience during cleaning is improved.

Embodiment 3 FIG.
FIG. 7 is a cross-sectional view of the hole 21 in the silencer of the electric vacuum cleaner according to Embodiment 3 of the present invention. The vacuum cleaner of the present embodiment is the same as that shown in FIG. 1, and the muffler is the same as that of the first or second embodiment. In addition, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
In the present embodiment, the central axis 50 of the hole 21 provided in the silencer inner wall 22 forms an angle of greater than 0 degree and less than 90 degrees from the normal direction to the surface of the silencer inner wall 22 in the air flow direction. The difference between the first and second embodiments is that the holes 21 are formed in the first and second embodiments. That is, the center axis 50 of the hole 21 is formed by inclining in the air flow direction, and the inclination angle of the center axis 50 is set to be greater than 0 degree and less than 90 degrees. 7 shows only the hole 21 on one side (for example, the lower inner wall 22 of the silencer), the other hole 21 is also formed symmetrically with respect to the central axis of the suction pipe 6.

  By using the silencer having the hole 21 configured in this way, it is possible to aerodynamically prevent dust having momentum from flowing into the silencer outer wall 23 side in the direction of airflow, Can proceed to the silencer outer wall 23 side as long as they are in spatial communication. Thereby, dust can be prevented from adhering to the sound absorbing material 24, and the inflow of dust into the space layer 25 (silenced space) provided between the sound absorbing material 24 and the sound deadening portion inner wall 22 is suppressed. The mute function can be maintained for a long time.

Embodiment 4 FIG.
The present embodiment is different from the first to third embodiments in that a deodorizing material is mixed or kneaded with the member of the sound absorbing material 24. Since other configurations are basically the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  By using the silencer 20 configured as described above, dust is attached to the sound absorber 24 during long-term use, or an air layer 25 (silence space) provided between the sound absorber 24 and the silencer inner wall 22 is used. Generation of an unpleasant odor of the silencer 20 caused by the accumulation of dust inside can be prevented.

  According to the present embodiment, even if a vacuum cleaner is used for a long period of time, the generation of odor due to dust accumulation in the sound absorbing material 24 or the air layer 25 provided between the sound absorbing material 24 and the silencer inner wall 22. Thus, the low noise performance of the vacuum cleaner can be maintained over a long period of time without causing discomfort due to odor even during long-term use.

Embodiment 5 FIG.
8 is a front view when the lid of the silencer with lid of the electric vacuum cleaner according to Embodiment 5 of the present invention is closed, FIG. 9 is a front view when the lid of the silencer of FIG. 8 is opened, and FIG. It is sectional drawing at the time of the lid opening of a sound deadening part. The vacuum cleaner of the present embodiment is the same as that shown in FIG. In addition, the same or equivalent components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
In the present embodiment, the silencer 20 with a lid 30 is provided, and the lid 30 that can be opened and closed is provided on the silencer outer wall 23, which is different from the first to third embodiments. The lid 30 is configured to open and close in a single-open manner with one side of the opening surface of the silencer outer wall 23 as an axis.

  By using the silencer 20 with the lid 30 configured in this way, the outer air layer 28 provided between the silencer outer wall 23 and the sound absorbing material 24 can be communicated with the atmosphere and communicated. It becomes possible to manipulate whether or not. When the lid 30 is opened during the operation of the vacuum cleaner, airflow flows from the atmosphere on the outer wall 23 side of the silencer toward the sound absorbing material 24 or the inner wall 22 side of the silencer, which is in a negative pressure. Dust that has flowed into the (silence space) can be sucked into the cleaner body 1. As a result, it is possible to remove dust adhering to the sound absorbing material 24 and to remove dust accumulated in the space layer 25 (silenced space), and to maintain a silencing function for a long time.

  According to the present embodiment, even if a vacuum cleaner is used for a long period of time, the sound absorbing material 24 or the space layer 25 (the sound deadening space) provided between the sound absorbing material 24 and the sound absorbing portion outer wall 23 is contaminated by dust. Since it is removable and the sound absorption effect is kept constant, the low noise performance of the vacuum cleaner can be maintained for a long time.

Embodiment 6 FIG.
11 is a front view of the silencer of the electric vacuum cleaner according to Embodiment 6 of the present invention, FIG. 12 is a front view of the silencer of FIG. 11 when the outer wall is divided, and FIG. 13 is a sectional view of the silencer of FIG. is there. The vacuum cleaner is the same as that shown in FIG.
The silencer 20 of the present embodiment is different from the previous Embodiments 1 to 5 in that the silencer outer wall 23 can be divided into two outer wall portions 23a and 23b.
The split surface is provided with an annular coupling 31 having an L-shaped cross section on one outer wall portion 23b, and the split end surface (circular cross section) of the other outer wall portion 23a is closely fitted in the coupling 31. It is the composition to do. Thereby, the two outer wall parts 23a and 23b can be attached or detached at the open end of each other. Since other configurations are the same as those of the first to fifth embodiments, the same reference numerals are given and the description thereof is omitted.

By using the silencer 20 configured in this way, the silencer outer wall 23 can be divided into two outer wall portions 23a and 23b, and therefore the sound absorbing material 24 disposed inside can be removed from the silencer 20. It becomes.
It is also possible to wipe off dust adhering to the outer wall portions 23a, 23b and the muffler inner wall 22. As a result, it is possible to remove dust adhering to the sound absorbing material 24 and to remove dust accumulated in the space layer 25 (silenced space), and to maintain a silencing function for a long time.

  According to the present embodiment, even if a vacuum cleaner is used for a long period of time, contamination by dust can be removed, and the sound absorption effect can be kept constant by replacing the sound absorbing material. The performance can be maintained for a long time.

Embodiment 7 FIG.
FIG. 14 is a cross-sectional view of the muffler part of the electric vacuum cleaner according to Embodiment 7 of the present invention. The vacuum cleaner is the same as that shown in FIG.
The silencer 20 of the present embodiment is different from the previous Embodiments 1 to 6 in that a filter 32 is installed between the sound absorbing material 24 and the silencer outer wall 23. Since other configurations are the same as those of the first to sixth embodiments, the same reference numerals are given and the description thereof is omitted.

  The silencer 20 includes a silencer outer wall 23, a silencer inner wall 22, a sound absorbing material 24, and a filter 32. The sound absorbing material 24 is provided with a space layer 25 (silenced space) provided between the sound deadening portion inner wall 22 and a filter 32 is disposed on the sound deadening portion outer wall 23 side.

  When the vacuum cleaner is operated in a state where the lid 30 of the silencer 20 configured as described above is opened, outside air flows into the silencer 20 and sucks up dust that has been rolled up during the cleaning operation. The sucked dust is adsorbed on the filter 32. Further, at this time, similarly to the fifth embodiment, the dust adhering to the sound absorbing material 24 is peeled off toward the muffler inner wall 22 side by an air flow from the outside and sucked into the cleaner body 1. Further, when the vacuum cleaner is operated in a state where the lid 30 is closed, noise is transmitted to the silencer 20 from the hole 21 of the silencer inner wall 22 and is silenced by the sound absorbing material 24.

  According to the present embodiment, it is possible to selectively suppress indoor noise according to the use condition of the vacuum cleaner, or to clean up by sucking up dust that is rolled up when using the vacuum cleaner from the outside air. It becomes possible for the user to operate whether to suppress the contamination of the indoor air. Moreover, it becomes possible to remove the contamination of the silencer due to dust, and the low noise performance of the vacuum cleaner can be maintained for a long time.

Embodiment 8 FIG.
15-17 is a front view which shows the muffling part of the vacuum cleaner which concerns on Embodiment 8 of this invention, and a vacuum cleaner is the same as what was shown in FIG. 15 is a front view of the silencer, FIG. 16 is a sectional view of the silencer of FIG. 15, and FIG. 17 is a sectional view taken along line BB of FIG.
This vacuum cleaner mainly connects the vacuum cleaner main body 1 incorporating the electric blower 2, the suction port body 3 including the floor suction tool 3 a for sucking dust, the vacuum cleaner main body 1 and the suction port body 3. A bellows-like hose body 4 and a suction pipe 6 including an extension pipe 5 are provided. In addition to the electric blower 2 described above, a dust collection unit (not shown) is installed inside the vacuum cleaner main body 1, and the electric blower 2 applies a negative pressure to the dust collection unit to remove dust from the suction port 3. Dust is collected in the dust collection part in the cleaner body 1 through the suction and suction pipe 6.

  The hose body 4 is made of a bellows-like hose member that can be freely bent, and the base end side connection portion of the hose body 4 is detachably connected to a main body suction port 7 provided at the front center portion of the cleaner body 1. The connecting portion is detachably connected to one end portion of the extendable extension tube 5. The other end (front end) of the extension pipe 5 is detachably connected to the floor suction tool 3a. Further, an operation unit 8 is provided on the distal end side connection part of the hose body 3 so that the operation mode of the electric blower 2 in the cleaner body 1 can be selected. The operation unit 8 is provided with a plurality of setting switches 9 for setting the drive of the electric blower 2 and the like to a predetermined state, and a grip unit 10 is formed for the operator to grip when cleaning.

The silencer 33 in the present embodiment is a sound absorption type silencer using a sound absorber 35. The silencer 33 has a sound absorber 35 disposed inside the silencer outer wall 34 as shown in FIGS. 15 and 16. It is installed facing the suction air flow path 38. In addition, although the silencing part 33 is shown by the circular cross section in FIG. 17, it is not restricted to a circular cross section, You may form the silencing part outer wall 34 partially in an arc-shaped cross-sectional shape. The silencer outer wall 34 is provided with end plates 36 and 37 for holding both ends of the sound absorbing material 35 in the front and rear.
As shown in FIG. 17, the sound absorbing material 35 is composed of a film 35a and a sound absorbing layer 35b. The film 35a is made of a smooth surface material such as a metal material such as stainless steel or aluminum, or a polymer material such as polyethylene or polyethylene terephthalate. The sound absorbing layer 35b is not limited to the illustrated one as long as it has a sound absorbing effect even if it is a urethane foam material or a felt-like fiber material. Then, the sound absorbing material 35 composed of the coating 35 a and the sound absorbing layer 35 b is installed so that the coating 35 a faces the suction air flow path 38.

When cleaning is performed using the electric vacuum cleaner configured as described above, an air flow is generated from the floor suction tool 3a to the vacuum cleaner main body 1 through the extension pipe 5 and the bellows-like hose body 4 due to the negative pressure generated by the electric blower 2. Induced. At that time, fluid noise is generated due to disturbance of the airflow in the floor suction tool 3a, and unpleasant noise is radiated from the suction port (not shown) of the floor suction tool 3a and the vacuum cleaner main body 1. Since the internal sound absorbing material 35 absorbs noise by providing the portion 33, unpleasant noise is reduced.
Further, although not shown in the drawings, the above silencer 35 may be filled inside the silencer outer wall 34. That is, the space layer 28 (see FIG. 16) in the silencer outer wall 34 formed outside the silencer 35 may be omitted. By filling the sound deadening material 35 inside the sound deadening portion outer wall 34, the vibration due to the air flow of the sound deadening material 35 is suppressed and the sound deadening performance is improved.

  In the present embodiment, the sound absorbing material 35 has a structure in which a film 35a is provided on the sound absorbing layer 35b, and the film 35a is disposed facing the intake air flow path 38, so that dust adheres to the sound absorbing layer 35b. Is suppressed, and the sound absorption performance can be maintained over a long period of time. Moreover, since only the sound absorbing layer 35b has surface waviness, roughness, and voids, it is inevitable that dust adheres and liquid dirt penetrates. However, by using the coating 35a having a smooth surface property, it is possible to prevent dust from accumulating due to the stagnation of the airflow caused by the undulation and surface roughness of the coating surface. Therefore, even if the vacuum cleaner is used for a long period of time, the sound absorbing material is less contaminated with dust and the sound absorbing effect is kept constant, so that the low noise performance of the vacuum cleaner can be maintained for a long period of time.

Embodiment 9 FIG.
FIG. 18 is a cross-sectional view of a sound absorbing material according to Embodiment 9 of the present invention.
The difference from the eighth embodiment is that a polymer material containing fluorine atoms is used for the film 39a of the sound absorbing material 39 of the present embodiment. The sound absorbing layer 39b is formed of a material having a sound absorbing effect such as a urethane foam material or a felt-like fiber material. Since other configurations are basically the same as those in the eighth embodiment, the same reference numerals are given and description thereof is omitted.

For the film 39a, for example, a polymer material containing fluorine atoms such as PTFE (polytetrafluoroethylene) or PVDF (polyvinylidene fluoride) is used. Fluorine atoms have strong bonding properties, and polymer materials containing fluorine atoms have high surface smoothness and chemical resistance.
By using the silencer 33 configured as described above, the dust attached to the film 39a easily peels off as the dust is sucked, so that the accumulation of dust on the film 39a can be suppressed.

  According to the present embodiment, even if a vacuum cleaner is used for a long period of time, contamination by dust can be removed, and the sound absorption effect can be kept constant by replacing the sound absorbing material. The performance can be maintained for a long time.

Embodiment 10 FIG.
FIG. 19 shows the relationship between the sound transmission loss and the sound frequency depending on the material and thickness of the film 39a of the sound absorbing material 39. The difference from Embodiments 8 and 9 is that the sound transmission loss is 10 dB or less when the surface density of the film 39a of the present embodiment is 1 kHz to 3 kHz. Since other configurations are basically the same as those in the eighth embodiment, the same reference numerals are given and description thereof is omitted.

The theoretical formula of the sound transmission loss of the material is shown as Equation 2.
TL = 10Log10 (1+ (2 * π * f * m) ^ 2 / (2 * ρ * c) ^ 2) (2)
Here, TL is sound transmission loss, m is surface density, f is frequency, ρ is air density, c is sound velocity, and π is circularity.
As shown in FIG. 19, when the film 39a is, for example, about 0.05 mm for PTFE and 0.075 mm for PVDF, the sound transmission loss is 10 dB or less in a frequency band of 3 kHz or less. By setting the sound transmission loss to 10 dB or less, the noise transmission amount to the sound absorption layer 39b increases and the sound absorption effect increases, so that the noise reduction effect of the noise reduction unit 33 can be obtained.

  According to the present embodiment, even if a vacuum cleaner is used for a long period of time, contamination due to dust easily peels off, so that accumulation of dust can be suppressed, and the sound absorption effect can be kept constant. Noise performance can be maintained for a long time.

Embodiment 11 FIG.
FIG. 20 shows a cross-sectional view of the sound absorbing material according to Embodiment 11 of the present invention. The sound absorbing material 40 of the present embodiment differs from the eighth embodiment in that a metal porous body is used as the material. Since other configurations are basically the same as those in the eighth embodiment, the same reference numerals are given and description thereof is omitted.

The sound absorbing material 40 is entirely composed of a metal porous body. The metal porous body is made by kneading and firing a thermoplastic polymer material such as urethane and a powder alloy material having a particle size of about 5 micrometers having a large internal damping property such as aluminum-iron. It is formed by removing the thermoplastic polymer material. Such a metal porous body has a large number of voids, and has a large normal incident sound absorption coefficient of 0.8 or more in a frequency band of 1 kHz or more.
As shown in FIG. 20, since the sound absorbing material 40 is used for the silencer 33, it is a metal even if there is dust adhering to long-term use. Performance is not compromised.
Even in this case, as described in the eighth embodiment, the silencer 40 may be filled inside the silencer outer wall 34.

  According to this embodiment, even if a vacuum cleaner is used for a long period of time, contamination by dust can be removed, the sound absorption effect can be kept constant, and the low noise performance of the vacuum cleaner can be maintained for a long time. Can do.

It is a perspective view of the vacuum cleaner which concerns on Embodiment 1 of this invention. It is a front view of the muffler part of FIG. It is sectional drawing of the muffling part of FIG. It is AA sectional drawing of FIG. It is a front view of the muffling part of the electric vacuum cleaner concerning Embodiment 2 of the present invention. FIG. 6 is a cross-sectional view of the silencer in FIG. 5. It is sectional drawing of the hole in the muffling part of the vacuum cleaner which concerns on Embodiment 3 of this invention. It is a front view at the time of lid closure of a silencer with a lid of a vacuum cleaner concerning Embodiment 5 of the present invention. It is a front view at the time of lid opening of the muffler part of FIG. It is sectional drawing at the time of lid opening of the muffler part of FIG. It is a front view of the muffling part of the electric vacuum cleaner concerning Embodiment 6 of the present invention. It is a front view at the time of the outer wall division | segmentation of the muffling part of FIG. It is sectional drawing of the muffling part of FIG. It is sectional drawing of the muffling part of the vacuum cleaner which concerns on Embodiment 7 of this invention. It is a front view of the muffling part of the electric vacuum cleaner concerning Embodiment 8 of the present invention. It is sectional drawing of the muffling part of FIG. It is BB sectional drawing of FIG. It is sectional drawing of the sound-absorbing material in Embodiment 9 of this invention. It is a figure which shows the relationship between the sound transmission loss of the sound-absorbing material in Embodiment 10 of this invention, and an acoustic frequency. It is sectional drawing of the sound-absorbing material in Embodiment 11 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body, 2 Electric blower, 3 Suction port body, 3a Floor suction tool, 4 Hose body, 5 Extension pipe, 6 Suction pipe, 7 Main body suction port, 8 Operation part, 9 Setting switch, 10 Grip part, 20 Muffler, 21 hole, 22 muffler inner wall, 23 muffler outer wall, 23a, 23b outer wall portion, 24 sound absorbing material, 25 space layer, 26, 27 end plate, 28 outer space layer, 29 connecting portion (or connecting pipe), 30 Lid, 31 Coupling, 32 Filter, 33 Silencer, 34 Silencer Outer Wall, 35 Sound Absorbing Material, 35a Film, 35b Sound Absorbing Layer, 36, 37 End Plate, 38 Suction Air Channel, 39 Sound Absorbing Material, 39a Film, 39b Silencer Layer, 40 Sound absorbing material.

Claims (13)

A vacuum cleaner body provided with an electric blower that applies a negative pressure to the dust collector, a suction port body for sucking dust, a suction pipe connecting the vacuum cleaner body and the suction port body, and the suction pipe A vacuum cleaner provided with a sound absorbing type silencer using a sound absorbing material,
The muffler includes a muffler inner wall provided with a plurality of holes in a portion that becomes an antinode of an internal acoustic mode of the suction pipe, and a muffler outer wall provided so as to cover the plurality of holes, A vacuum cleaner characterized in that a material is installed with a space layer between the inner wall of the silencer.   The vacuum cleaner according to claim 1, wherein the silencer is provided in a connection part or a connection pipe that detachably connects the suction pipes.   The plurality of holes are formed so that a central axis of the hole forms an angle of greater than 0 degrees and less than 90 degrees from a normal direction to a surface of the inner wall of the muffler portion in a direction of air flow. The electric vacuum cleaner according to claim 1 or 2.   The vacuum cleaner according to any one of claims 1 to 3, wherein the sound absorbing material is configured by mixing or kneading a deodorant material.   The vacuum cleaner according to any one of claims 1 to 4, wherein a lid that can be opened and closed is provided on the outer wall of the silencer.   The vacuum cleaner according to any one of claims 1 to 5, wherein the silencer outer wall is configured to be detachable by being divided into two outer wall parts before and after the traveling direction of the airflow.   The vacuum cleaner according to any one of claims 1 to 6, wherein a filter is installed between the sound absorbing material and the outer wall of the silencer. A vacuum cleaner body provided with an electric blower that applies a negative pressure to the dust collecting part, a suction port body for sucking dust, a suction pipe connecting the vacuum cleaner body and the suction port body, and provided in the suction pipe A vacuum cleaner provided with a sound absorbing type silencer using a sound absorbing material,
The silencer includes a sound absorbing material composed of a sound absorbing layer and a film having a smooth surface property, and the sound absorbing material film is disposed facing the suction air flow path of the suction pipe. Electric vacuum cleaner.   The vacuum cleaner according to claim 8, wherein the sound absorbing material film is made of a polymer material containing a fluorine element.   The vacuum cleaner according to claim 8 or 9, wherein the sound-absorbing material film has a surface density at which sound transmission loss is 10 dB or less at 1 kHz to 3 kHz.   The vacuum cleaner according to any one of claims 8 to 10, wherein the sound absorbing material is filled inside an outer wall constituting the muffler. A vacuum cleaner body provided with an electric blower that applies a negative pressure to the dust collector, a suction port body for sucking dust, a suction pipe connecting the vacuum cleaner body and the suction port body, and the suction pipe A vacuum cleaner provided with a sound absorbing type silencer using a sound absorbing material,
The silencer is provided with a sound absorbing material composed of a metal porous body having a large number of voids.   13. The electric vacuum cleaner according to claim 12, wherein the sound absorbing material is filled inside an outer wall that constitutes the silencer.

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