JP2656661B2 - Electric 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 having a muffler that absorbs airflow noise generated from a passage of an airflow of the vacuum cleaner. .

[Conventional technology]

As a noise reduction device for this type of vacuum cleaner,
No. 48217, JP-A-63-294821, JP-A-58-152254, JP-A-58-15255, JP-A-58-163147 and JP-A-58-18136 are known.

In Japanese Patent Application Laid-Open No. 63-294821, a dust collecting pipe holding section partitioned by a partition is formed above a vacuum cleaner in which a cord winder, an electric blower and a filter are arranged in series, and the filter and the floor are placed in the holding section. A dust collecting pipe for connecting the nozzles is arranged, a number of sound absorbing holes are arranged on the peripheral wall of the dust collecting pipe, and the holding portion outside the peripheral wall is filled with a sound absorbing material.

In Japanese Utility Model Application Laid-Open No. 58-152254, an outer cylinder provided with an air volume adjusting hole opened and closed by an air volume adjusting valve and an air-permeable inner cylinder such as a non-woven fabric are provided. The muffler is provided with a muffler interposed with a sound absorbing material having the structure described above, and this muffler is configured to be detachable in a suction pipe connected to the cleaner body.

In Japanese Utility Model Application Laid-Open No. 58-15255, a muffler in which a sound-absorbing material having air permeability is inserted between the outer cylinder and the inner cylinder is used in a vacuum cleaner that can be freely attached and detached in the suction pipe connected to the cleaner body. The inside of the sound absorbing material is formed in a waveform, and a ventilation path is formed between the inside and the inner cylinder.

In Japanese Utility Model Laid-Open No. 58-18136, an extension tube for a vacuum cleaner is constructed by inserting and connecting an inner tube and an outer tube so as to be extendable and contractible with each other. A large-diameter portion is formed, and this large-diameter portion is an extension tube for a vacuum cleaner which is located near an end opposite to the inner tube connection side and contains a sound absorbing material (soft urethane foam resin) therein.

Japanese Patent Publication No. 57-48217 discloses an outer cylinder in which a number of holes are provided on the peripheral wall except for both ends of the inner cylinder of a silencer that directly communicates with a hose and an extension pipe, and the outer peripheral surface of the inner cylinder including these holes is surrounded with an appropriate gap. And a sound absorbing material such as a nonwoven fabric is filled in the gap.

In the silencer of Japanese Utility Model Application Laid-Open No. 58-163147, a cylindrical main body,
A cylindrical sponge body as a sound absorbing material inserted in the main body, and a cylindrical filter paper as a porous thin-walled shape retaining member having an inner periphery of the sponge body and a diameter larger than an inner diameter of the outer connection pipe. It has a structure including:

[Problems to be solved by the invention]

In the structure of JP-B-57-48217, a mesh is attached to the inner cylinder wall surface having a large number of sound-absorbing holes, and the thickness of the sound-absorbing holes is as thin as about 0.2 to 0.8 mm. Usually, in the extension pipe of the vacuum cleaner, various kinds of dust are sucked and collected into the main body while colliding with all surfaces of the inner wall of the extension pipe with a considerable impact force by a high-speed airflow having a flow velocity of 20 to 40 m / s.

Therefore, in the pasting structure in which the mesh is integrally formed on the inner cylinder wall surface by injection molding, there is not much space between the wall surface and the mesh, and the flexibility is impaired. Wear and tear or tear. Further, the extremely thin sound-absorbing hole portion has a disadvantage that the above-mentioned problem is likely to occur when relatively heavy objects are repeatedly dust-absorbed as described above. In addition, since the muffler suction pipe is set at a position distant from the telescopic extension pipe and the floor suction port, two pipes are required within the curved inlet pipe of the floor suction port.
It has a low silencing effect on airflow noise that occurs next, and is limited in its application to various types of vacuum cleaners, and has low industrial value.

In the structure of JP-A-63-294821, a sound absorbing material such as a nonwoven fabric is filled between an outer cylinder and an inner cylinder having a number of sound absorbing holes formed in a peripheral wall. Occasionally, the sound-absorbing hole is clogged and the ventilation resistance increases, and the sound-absorbing effect is apt to be greatly reduced. In addition, when a dust having a relatively sharp shape such as a hairpin or a toothpick is absorbed, airflow always enters and exits between the sound-absorbing hole and a sound-absorbing material such as a nonwoven fabric, so that the above-described object easily enters the sound-absorbing hole. For this reason, clogging in the pipe is apt to occur, which has a practical disadvantage. Furthermore, as in the above-mentioned Japanese Patent Publication No. 57-48217, since the muffler is formed at a position far away from the floor nozzle, airflow propagation noise generated from the electric blower in the main body is generated in the intake curved pipe portion, The effect of reducing the airflow generation noise is low and the user remains unhappy at a level at which the user can realize the low-noise vacuum cleaner.

In the structure of Japanese Utility Model Application Laid-Open No. 58-152254, every time the air volume adjusting hole is repeatedly opened and closed in order to adjust the suction force during cleaning, dust such as cotton dust or fine dust is formed on the surface opposite to the air volume adjusting hole made of nonwoven fabric. The cylinder portion is easily clogged, and by repeating such an operation, the clogged portion gradually expands, and the reduction of the sound deadening effect as the silencer is easily promoted. Furthermore, when the air volume adjusting hole is opened, the non-woven fabric portion facing the air volume adjusting hole has a practical drawback which causes factors such as a faster flow speed of the hair and the like, which makes it easier for hair and the like to be stuck and to cause clogging.

In the structure of Japanese Utility Model Application No. 58-15255, the inside of the sound-absorbing material having air permeability is corrugated, and a ventilation path is formed between the inner cylinder and the air-absorbing material so that the ventilation resistance between the inner cylinder and the sound absorbing material is reduced. However, during cleaning, fine dust or hair is likely to enter due to low airflow resistance between them, and during this time, dust accumulates and clogs to reduce noise reduction effect. Under the constantly changing natural environment of Japan, these invaded dust parts rot and become nests for breeding of bacteria and the like, and lack sanitary consideration for users.

In the structure of Japanese Utility Model Application Laid-Open No. 58-18136, a large-diameter portion is provided in a part of the outer tube of the telescopic extension tube, and a flat sound-absorbing material made of soft urethane foam resin is wound into a cylindrical shape and housed in the large-diameter portion. However, during cleaning, the sound absorbing material is rolled up from the large diameter part due to the pressure fluctuation in the extension pipe due to the operation of attaching and detaching the suction opening to and from the surface to be cleaned, and the sound absorbing function is lost and collected in the cleaner body There was a problem that there was some undulation due to the urethane foam resin on the inner surface of the sound absorbing material, a toothpick or the like was apt to be stabbed, and clogging occurred during use to reduce handleability.

In the silencer structure disclosed in Japanese Utility Model Application Laid-Open No. 58-163147, a cylindrical thin sponge body as a sound absorbing material or a porous thin-walled shape preserving member for preserving the inner periphery of a sponge body with glass wool is made of a cylindrical filter paper or a cloth material. Then, when dust which has absorbed a little moisture is sucked, filter paper or cloth which forms the inner peripheral surface easily absorbs water and dust easily adheres to the dust, so that clogging tends to occur. Further, bacteria and the like propagate in the above state, and the small diameter side outer surface comes into contact with the inner peripheral surface by expanding and contracting the connection pipe small diameter side, and the user adheres to the small diameter side outer surface during cleaning, so that the user can perform cleaning or the like. It was easy to touch during storage and lacked hygienic considerations for the user.

Further, the silencer is more distant than the suction port attachment, the effect of suppressing the airflow sound secondary generated by the suction port attachment is small, and the silencer having a larger diameter than the flexible pipe is set, In the operation of cleaning the flexible tube and the silencer by hand, there is a problem in the handling operation because the grip portion is thick.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum cleaner having a sanitary and simple configuration, which has an extremely high noise reduction effect, hardly causes clogging, and has a sanitary effect.

[Means for solving the problem]

In order to achieve the above object, a peripheral wall of a central portion of an outer cylinder made of a synthetic resin is bulged outward to form a large-diameter portion, and both ends of the large-diameter portion are connected to a suction joint portion or an extension pipe. Are provided, and a ring portion having the same diameter as the inner diameter of each joint portion is provided so as to slightly enter into the large-diameter portion to form an outer cylindrical portion. The outer cylinder portion holds an outer cylinder main body in which a mouth joint portion and a large-diameter portion are integrated, and an outer cylinder auxiliary body in which an extension pipe joint portion and a large-diameter portion are integrated, such as a screw or an adhesive. The outer cylinder is constituted by the means. A cylindrical sound absorbing material in which a polyester resin is spun and accumulated in the form of a filament thread (long fiber) around the inner periphery of the outer cylinder mainly constituted as described above, and a polyester resin which is inserted into the inner periphery of the sound absorbing material to form a ventilation path One end of a ventilation tube formed of a non-woven fabric made of a cylindrical shape is inserted and supported on the outer periphery of the ring portion of the mouth joint joint, and the other end of the sound absorbing material is inserted on the outer periphery of the ring portion of the outer cylinder auxiliary body. At the same time, the outer cylinder main body and the large-diameter portion of the outer cylinder auxiliary body are joined to constitute a muffling device.

In addition, the sound absorbing material surface and the nonwoven fabric surface on the ventilation path side are subjected to a water-repellent treatment, and the sound absorbing material and the nonwoven fabric are subjected to an antistatic treatment. Is calendered to make the surface smooth.

In addition, the polyester resin has a sound absorbing material configuration in which the filaments are arranged and integrated so that the diameter of the filament yarn becomes thinner toward the outside. Further, the cylindrical or polygonal cylindrical sound absorbing material has a configuration in which a part of the outer circumferential length direction is flat or a groove is formed.

Furthermore, a configuration in which a nonwoven fabric is inserted into the outer peripheral surface of the sound absorbing material, a configuration in which a surface hardened portion is formed by heat treatment, or the like, or an outer peripheral surface of the sound absorbing material in which hard paper, a synthetic resin, or a metal ultrathin plate is inserted. In which a hard part is provided.

[Action]

Since the sound-absorbing material is made by spinning and collecting polyester resin into filament yarn (long fiber), the pore volume is larger than that of discontinuous cellular foamed resin such as urethane foam or open cellular foamed resin because it is an aggregate of ultrafine fiber diameter. Therefore, the sound energy absorption effect is high and the noise reduction effect can be selected. Further, the ventilation tube made of a nonwoven fabric is also obtained by spinning a polyester resin into a filament thread (long fiber).

Further, although the nonwoven fabric itself is thin, it has a slight noise reduction effect. Further, since a slight air layer is formed between the sound absorbing material and the ventilation cylinder, a synergistic effect is generated by this configuration, and the noise reduction effect is remarkably improved. Further, since the non-woven fabric and the sound absorbing material are formed in a filament form, the quality is stable and good sound deadening characteristics can be obtained. In addition, since the ventilation tube made of non-woven fabric is also constructed with a continuous laminated structure, the strength is strong, and there is no fuzzing and there is no yarn fray in the surface cross section, so the suction airflow mixed with dust can flow through the ventilation tube. At the time of flowing, the entanglement and clogging of the fibers of the nonwoven fabric are extremely reduced, so that the airflow resistance on the nonwoven fabric surface increases little and the sound deadening effect does not decrease. In addition, the nonwoven fabric forming the ventilation tube is subjected to antistatic treatment, water-repellent treatment, and calendering to make the surface smoother, so that dust is less likely to be charged and adhered to wet dust. In addition, the turbulent boundary layer is formed by preventing dust from getting entangled by imparting the function of repelling water and smoothing the surface, and by reducing the frictional force acting between the wall of the ventilation tube and the flow. It is possible to prevent the development of the sound, prevent the regenerated sound as much as possible, and always maintain a large noise reduction effect.

Further, by forming the nonwoven fabric forming the ventilation tube into two sheets, the sound absorption coefficient is improved by increasing the plate thickness, and the noise reduction effect by the synergistic action due to the formation of the air layer is further improved. . Of the two nonwovens,
By configuring the inner non-woven fabric to have a lower airflow resistance than the outer non-woven fabric, the collision speed is reduced by the inner non-woven fabric at the time of dust absorption, so that the adhesion of dust to the outer non-woven fabric is reduced and clogging does not occur. In addition, since the inner non-woven fabric has a small airflow resistance, most of the fine dust passes through and does not clog. Therefore, clogging of the nonwoven fabric and the sound absorbing material is small, and the sound deadening effect is not reduced.

Further, since the silencer provided at the rearmost end of the exhaust flow discharges only the clean airflow, the sound absorbing material is not clogged and the silencing effect is not reduced.

〔Example〕

The present invention solves the above-mentioned conventional disadvantages, and an embodiment thereof will be described below with reference to FIGS.

First, the basic configuration of the electric vacuum cleaner will be described with reference to FIG. Reference numeral 2 denotes a vacuum cleaner main body in which an electric blower and a dust collection chamber (both not shown) are built. Above the dust collection chamber, one end of a flexible hose 4 is detachably mounted via a joint 6, while the other end is connected via a hose handle portion 8 via an extension pipe 9 and a suction joint 11 a. The suction port 11 is detachably mounted. When the electric blower incorporated in the cleaner main body 2 is turned on in the vacuum cleaner configured as described above, a suction airflow is generated, which spills to the suction port 11 through the flexible hose 4 and the like, and the suction port 11 By sucking dust on the floor surface, the dust flow passes through the extension pipe 9 and the flexible hose 4,
At the same time as the dust is trapped in the dust collecting chamber in the cleaner main body 2, the clean airflow filtered in the dust collecting chamber passes through the electric blower, and is formed in an exhaust silencer chamber formed around the rear of the electric blower in the cleaner main body 2 ( (Not shown), and is discharged to the outside through the exhaust port 12. As described above, it is impossible to prevent noise from occurring due to the configuration in which the suction is performed by the electric blower to perform the cleaning. However, the rotational vibration noise and exhaust noise caused by the electric blower were reduced to a low noise level by improving the vibration isolating rubber and vibration isolation structure, and the exhaust noise was improved by improving the exhaust noise silencing structure, etc. I can now clean it. However, the suction power for cleaning is at a level at which the suction power of the vacuum cleaner is suppressed and used, and is not in a state that can satisfy the customer. This means that the cleaner itself has been improved as described above and the noise has been reduced, but the airflow noise generated by the suction airflow is transmitted to the hose 4, the extension pipe 9, and the suction port 11. Since it is radiated outside and generates extremely high noise, it is dressed with reduced suction power. Therefore, it is necessary to rotate the electric blower at high speed to draw out high suction power,
It is difficult because the sound of airflow rises inevitably. Furthermore, since the suction airflow flows through the hose 4 and the suction port 11, the inside of the
They occurred secondarily and were the main noise sources. In order to reduce the noise generated by the airflow, silencers as described in the section of the conventional example have been proposed or implemented. However, the noise level is about 50 dB, and the noise level is reduced to about 40 dB. There were many difficulties in sound, such as handling, durability, and price. Also, for each part, the hose 4 inlet,
Although the flow path was smoothed by improving the shape of the flow path in the hose 4 and the suction port 11, it was impossible to reduce the generated sound by 10 dB or more.

Referring now to FIG. 1, an embodiment of the present invention will be described. The silencing device 12 has a cylindrical large-diameter portion 16 which is formed of a synthetic resin and has a peripheral wall at the center of an outer cylinder 14 bulging outward.
The outer cylinder 14 is composed of an inlet joint-joining outer cylinder 14a and an extension pipe-joining outer cylinder 14b that are each substantially divided into two in the longitudinal direction. On the opposite side of the large-diameter portion 16a on the side of the outer joint 14a,
An inlet joint connecting portion 18 having a cylindrical small diameter for detachably connecting to the a is integrally formed with the large-diameter portion 16a by an upright wall surface 20a. A large diameter portion 16 is formed on the inner peripheral surface 19 of the suction joint joint 18.
It has a small cylindrical portion 19a extending inside a, and a tip portion 19b is formed in a tapered shape. Further, a step portion 15 for fitting the distal end portion of the extension pipe joint outer cylinder 14b is formed at the end of the mouth joint joint outer cylinder 14a.

On the other hand, on the side of the extension pipe joint outer cylinder 14b, an extension pipe joint portion 22 having a small cylindrical diameter and detachably externally joined to the extension pipe 9 is integrally formed with the cylindrical large surface 16b by the upright wall surface 20b. Have been. The inner peripheral surface 23 of the extension pipe joint 22 has a large diameter portion 16b.
And a distal end portion 23b is formed in a tapered shape. A sound absorbing material 26 is accommodated in the inner peripheral surfaces 17a and 17b of the outer joint 14a and the outer cylinder 14b. The sound absorbing material 26 is spun and accumulated in a filament form (long fiber) with a polyester resin, formed into a cylindrical shape, and a filament thread (long fiber) non-woven fabric made of a polyester resin is formed around the inner periphery of the sound absorbing material 26 in a cylindrical shape. A ventilation tube 28 formed into a shape is inserted, and the outer periphery of the sound absorbing material 26 is formed on the inner peripheral surfaces 17a, 17 of the outer joint 14a and the outer tube 14b of the extension pipe as described above.
b, and both ends of the sound absorbing material 26 including the ventilation tube 28 are stored in contact with the inner surfaces of the upright wall surfaces 20a, 20b by pressing the outer tubes 14a, 14b in opposition to each other. On the other hand, the outer cylinder 14a
The distal end of the outer cylinder 14b is fitted into the step 15 provided at the distal end of the outer cylinder 14b. The silencer 12 in which the step portion 15 thus fitted is firmly held by a fixing means such as bonding or ultrasonic welding.
Can be formed. Here, both ends 28a, 28b of the cylindrical ventilation tube 28 are joined to the outer peripheral surfaces of the small cylindrical portions 19a, 23a, respectively, to obtain a strong ventilation cylinder 28. Further, the small cylindrical portions 19a, 23a
Are thin-walled, so that each of the small cylindrical portions 19a, 23
a The configuration is such that the ventilation tube 28 is provided inside with substantially the same diameter as the inner diameter.

The present invention relates to the above-mentioned joint of the silencer 12 between the suction port 11 and the extension pipe 9 shown in FIG.
A vacuum cleaner can be constructed by joining 18, 22. When the power is turned on to the electric blower, a suction airflow is generated and the hose 4
Then, it is transmitted to the extension pipe 9, the silencer 12, and the suction port 11 to be ready for cleaning. At this time, the airflow noise generated by the suction airflow also has the same path, that is, the hose 4, the extension pipe 9, the silencer 12,
The light propagates through the suction port 11 and is emitted from the suction port 11 to the outside. But,
The airflow noise generated by the electric blower is turbulently promoted on the inner wall surface of the hose 4, and secondary airflow occurs again to increase the generated noise and propagate through the extension pipe 9. Since the airflow noise absorbed and reduced by the sound absorbing material 26 is transmitted to the suction port 11, the airflow sound radiated to the outside from the suction port 11 is also extremely quiet. Here, the airflow noise generated up to the extension pipe 9 enters the silencer 12 as shown by the arrow in FIG. 1 and is absorbed very slightly by the nonwoven fabric forming the ventilation tube 28, and a slight noise is generated between the ventilation tube 28 and the sound absorbing material 26. The noise is further reduced in the air layer, and the sound absorbing material 26 having a plurality of pores in the form of filament yarns converts the airflow sound, that is, the acoustic energy into and out of the pores, to be converted into thermal energy by resistance attenuation, thereby increasing the noise reduction effect. You will get silence. Further, since the inner peripheral portion of the noise reduction device 12 has a small step as described above, the inner peripheral surface 19 of the inlet joint connecting portion 18, the inner surface of the ventilation tube 28, and the extension pipe connecting portion 22
When the airflow sound propagates to the inner peripheral surface 23 of the airbag, the airflow sound is connected with substantially the same diameter, so that not only a good noise reduction effect is obtained without the occurrence of turbulence induced by the step, but also the airflow containing dust is sucked. Even when it is done, it is not easily clogged and clogged.

Further, since the sound absorbing material 26 and the ventilation tube 28 have air permeability, the airflow sound transmitted from the cleaner body can be efficiently absorbed by the adsorbing material 26, and of course, the ventilation tube against the dust current including the fine dust can be prevented. The dust passing through the air collecting tube 28 is finely trapped, and the ventilation tube 28 is clogged and reflects the airflow noise, does not transmit to the sound absorbing material 26, and therefore, the sound deadening effect does not deteriorate early. Also, here the sound absorbing material 26
As a result of suctioning a large amount of fine dust on the experiment, less than 1% of the area of the sound absorbing material 26 in a few grams adheres to the dust and clogs it. It has been confirmed that the level is not affected.

This can be said to be a proof that not only the airflow noise but also that dust enters and exits the sound absorbing material efficiently. Therefore, as a result of a comparison experiment of the sound absorbing material 26 with a urethane foam which is generally known as a high sound absorbing material, as shown in FIG. 3, there is a remarkable effect of the present sound absorbing material 26 from the relationship between the amount of dust absorption and noise. I understand. Here, the dashed curve is when urethane foam is used, and the solid curve is when the sound absorbing material 26 is used.

From this, when a silencer using urethane foam as a sound absorbing material is used, clogging occurs in a practically early stage and the noise value rises, so that the initial characteristics cannot be maintained and the silencer has a small noise reduction effect. Become. Here, the initial noise of the urethane foam is low because the thickness of the sound absorbing material is twice as large as that of the sound absorbing material.Thus, since the outer diameter of the sound absorbing device is difficult to handle, the outer diameter of the sound absorbing material 26 is small. This difference is shown because the weight is further reduced. Therefore, when the sound absorbing material 26 is made of urethane foam,
It is required to select a material that does not clog 28.

In this regard, clogging due to dust absorption can be improved by applying a fuzz prevention treatment to the surface of the filament thread-like nonwoven fabric on the ventilation path side with a polyester resin or by performing a calendering process to make the surface smooth. However, since the ventilation holes of the ventilation tube 28 made of nonwoven fabric are slightly closed, the ventilation resistance increases, and the airflow noise is blocked by the ventilation tube 28,
The sound is not reflected by the sound absorbing material 26 but is reflected by the surface of the ventilation tube 28, and the sound deadening effect is low even in a new state. Therefore, in order to maximize the noise reduction effect, the ventilation resistance of the ventilation tube 28 is set at a passing air velocity of 0.
A non-woven fabric of 40 mmAq or less calendered at 2 to 0.5 m / s was effective experimentally.

Also, as shown in FIG.
Two ventilation cylinders 28 are aligned on the inner circumference, the ventilation resistance of the inner cylinder 28a is minimized, and the ventilation cylinder 28 of the outer cylinder 28b is equivalent to the inner cylinder 28a,
By constructing a nonwoven fabric with a higher airflow resistance,
Since the speed at which the dust collides with the outer cylinder 28b is reduced, clogging is less likely to occur, so that the sound energy can easily enter and exit the sound absorbing material 26, and the noise reduction effect is further improved. Further, since an air layer is formed between the outer cylinder 28b and the inner cylinder 28a, the above-mentioned effect is produced.

The ventilator that has been calendered using a higher ventilation resistance has an initial (when new) value of 2-3 dB (A) higher, and rises more than 4 dB when absorbing 400 g of fine dust capacity, making it impractical. . In addition, by attaching or penetrating an antistatic thread or an antistatic agent to the sound absorbing material 26 and the ventilation tube 28,
It is possible to prevent clogging due to adhesion of dust due to electrostatic adhesion, and has an effect that sound absorption of the silencer 12 can be constantly maintained for a long period of time. Alternatively, the prevention thread or the prevention agent may be provided only to the ventilation tube 28.

Further, the combined use with the above-described calendering has a further effect.

Further, by applying a water-repellent treatment to the sound absorbing material 26 and the ventilation passage side of the ventilation tube with a fluororesin or the like, there is an action of being released without adhering even to wet dust, so that it is hard to adhere, so that clogging is prevented. Since the prevention is achieved, the silencer 12 that always has a high sound absorbing effect can be maintained.

Next, a comparison of the sound absorbing effect of the sound absorbing material 26 was conducted and confirmed. This is shown in FIG. This is an extension of the non-woven fabric ventilation tube 28 provided on the inner periphery and the two silencers with the urethane foam wall thickness t10, the silencer 26t5, and the silencer 26t5 inside the outer cylinder 14 of the silencer 12. The difference from the tube alone
This is an experimental result plotted at a frequency of 1/3 octave band, and indicates that the higher the plot point, the higher the sound absorption volume. That is, it can be said that the present sound absorbing material has almost the same effect at half the thickness of the urethane foam. Further, by increasing the length of the silencer, a greater sound absorbing effect is exhibited, and the silencer can be reduced in size and weight, and a silencer having a large industrial value can be obtained.

Since the present sound absorbing material 26 is an aggregate having a filament thread-like ultrafine fiber diameter made of a polyester resin, sound absorption is high and sound absorption is good as a result.

In addition, the dust adhering into the sound absorbing material 26 may be decomposed depending on the use environment such as temperature and humidity after several years, but the sound absorbing material 26 and the ventilation tube 28 are made of polyester fiber. It has little moisture absorption and water absorption, it dries quickly even when it is slightly wet, and is not susceptible to mold and bacteria and has excellent antiseptic properties.

Further, since the ventilation tube 28 and the sound absorbing material 26 have air permeability, there is a concern about a configuration in which leakage loss of suction force is concerned.However, as described above, the outer joint 14a and the extension tube joining outer cylinder of the silencer 12 are connected as described above. Since the airtight structure can be formed by bonding or welding means, the suction force does not decrease due to leakage. In addition, when a glass or metal piece is sucked, a ventilation tube formed of a filament-like non-woven fabric with a polyester resin in a cylindrical shape
It does not pierce or tear 28. This is because the two-layer structure with the sound absorbing material 26 has the flexibility of the sound absorbing material 26 and the impact is mitigated by the very slight air layer in the overlapped part, and the wear resistance of the polyester fiber This is because the surface has excellent properties and is a long fiber, which has a characteristic effect of preventing the yarn from fraying.

Next, FIG. 6 of another embodiment will be described. Silencer
The sound-absorbing material 26 in 12 is formed in a cylindrical shape, and the fiber diameter 34a spun into a filament thread by a polyester resin is gradually reduced by an appropriate combination of, for example, 10 denier to 1 denier as it goes to the outer peripheral surface of the sound absorbing material 26. The ventilation tube 28 is internally provided and supported on the inner periphery of the sound absorbing material 26 as described above. Accordingly, a plurality of voids, that is, pores 36 are formed in the cross section in the thickness direction of the sound absorbing material 26, and the airflow sound, that is, the acoustic energy is attenuated by entering and exiting the pores 36, and is converted into thermal energy, thereby further producing a noise reduction effect. Further, a plurality of air layers 29 are provided between the outer peripheral surface of the ventilation tube 28 and the inner peripheral surface of the sound absorbing material 26,
This further improves the silencing effect. In addition, by making the inner peripheral shape of the sound absorbing material 26 into a polygonal cylindrical shape, an air layer is further formed between the sound absorbing material 26 and the outer peripheral surface thereof, and the surface area of the sound absorbing material 26 can be increased, so that the sound absorbing effect can be further enhanced. It will be. In addition, since the outer peripheral surface is formed of fine fiber dust and is formed to be harder than the inner peripheral portion, the noise reduction device
It is easy to insert the sound absorbing material 26 into the interior 12 and has improved assemblability.

Next, another embodiment of the present invention will be described with reference to FIGS. 7 to 11. FIG.

The silencer 38 has a large-diameter cylindrical portion 42 which is formed of a synthetic resin and has a peripheral wall at the center of an outer cylinder 40 bulging outward. The outer cylinder 40 is a suction-joint-jointed outer cylinder 40a roughly divided into two in the longitudinal direction.
And an extension tube joining outer tube 40b. Suction fitting joint outer cylinder 4
On the side opposite to the large-diameter portion 42a on the 0a side, a suction-port joint connecting portion 44 having a cylindrical small diameter for detachably joining to the suction joint 11a of the suction port 11 is formed eccentrically and integrally with the large-diameter portion 42a by an upright wall surface 46a. ing. The inner peripheral surface 45 of the mouth joint joint 44 has a small cylindrical portion 45a extending into the large-diameter portion 42a. In addition, a step 47 for fitting the distal end of the extension pipe joint outer cylinder 40b is formed at the distal end of the mouth joint joint outer cylinder 40a.

On the other hand, similarly to the above, the extension pipe joint outer tube 40b is also a cylindrical small-diameter extension tube joint portion detachably and externally joined to the extension tube 9.
48 is eccentrically integrated with the standing wall surface 46b. The small cylindrical portion 4 extending into the large-diameter portion 42b is formed on the inner peripheral surface 49 of the extension pipe joint 48.
9a.

In addition, the outer joint 40a and the outer cylinder 4
As shown in the sectional view of the sound-absorbing material shown in FIG. 8, the sound-absorbing material 26a having the uneven thickness structure is accommodated in the inner peripheral surfaces 43a and 43b of Ob. The sound-absorbing material 26a is spun and accumulated in a filament form from a polyester resin, and is formed into a cylinder having an uneven thickness. A ventilation tube 28a in which a filament-shaped non-woven fabric made of polyester resin is formed in a cylindrical shape is inserted into the inner periphery of the sound absorbing material 26a, and the outer peripheral surface of the sound absorbing material 26a is connected to an outer joint 40a and an extension tube joined outer tube as described above. Abut the inner peripheral surfaces 43a and 43b of the
The two ends of the sound absorbing material 26a including a are pressed against the outer cylinders 40a and 40b so as to abut on the inner surfaces of the upright wall surfaces 46a and 46b. On the other hand, a step 4 provided at the tip of the outer cylinder 40a
7, the tip of the outer cylinder 40b is fitted. The muffling device 38 in which the fitted steps are firmly held by fixing means such as bonding or ultrasonic welding can be formed. One surface of the outer peripheral longitudinal direction of the mouth joint joint outer cylinder 40a and the extension pipe outer cylinder 40b and the respective joints 44, 48 of the thus configured silencer 38 is formed substantially straight. The joint section 44 of the silencer 38
The suction joint 11a of the suction port 11 is joined to the
The extension pipe 9 is joined to the extension pipe 9, the hose handle 8 of the hose 4 is joined to the extension pipe 9, and the joint 6 of the hose 4 is attached to the cleaner body 2.

In the above configuration, when the power is supplied to the electric blower in the cleaner body 2, suction airflow is generated, transmitted to the hose 4, the extension pipe 9, the silencer 38, and the suction port 11, and becomes in a state capable of cleaning. At this time, the airflow sound generated by the suction airflow also propagates along the same path and is radiated to the outside from the suction port 11, but the airflow sound enters and exits the sound absorbing material 26a through the ventilation tube 28a in the silencer 38. Since the absorbed and reduced airflow sound is transmitted to the suction port, the airflow sound radiated to the outside is also reduced.

Next, when cleaning the bed or under the desk 50, etc. in the above-described configuration, the opening is narrow, so the extension pipe 9 is attached to the floor surface 52, and if the suction is not performed so that the suction port enters the under the desk 50, the desk is not cleaned. I can't clean the bottom 50 below. In this silencer 38, since the outer peripheral surface is formed substantially in a straight line, as shown in FIG. 9, the suction surface of the suction port 11 and the floor surface 52 come into contact with each other, so that dust is easily absorbed. Therefore, as shown in FIG. 10, when the outer cylinder 40a of the silencer 38a is formed concentrically with the mouth joint joint 44a and the extension pipe joint 48a, when the mouth 11 is joined, the mouth 11 has a suction surface. The outer cylinder 40a is not aligned with the outer cylinder 40a. Therefore, when cleaning the floor 52 such as the lower part 50 of the desk, a gap H is formed between the floor 52 and the suction surface of the suction port 11, so that cleaning cannot be performed. Therefore, by using the noise reduction device 38, the uncleaned area is eliminated even a little, and practical effects such as improved usability are obtained.

When the stand is stored as shown in FIG. 11 after the cleaning is completed, the claw portion (not shown) of the substantially U-shaped pipe hook 54 previously installed at an arbitrary position of the extension pipe 4 is attached to the cleaner body. 2 By being inserted and supported in a pipe hook receiving groove (not shown) provided in the lower part of the front surface, the bottom surface 3 of the cleaner body 2 and the outer peripheral portion of the silencer 38 are in contact with each other with little rattling or the like. In fact, even during transportation, the silencer 38 does not swing right and left in the width direction of the bottom surface 3 of the cleaner body 2, so that the handleability is good. This means that, as described above, a part of the silencer 38 in the longitudinal direction of the outer periphery is substantially straight and the extension pipe 9
Because it is on the same straight line as the outer circumference, a part of the outer circumference of the extension pipe 9 and the entire outer circumference in the longitudinal direction of the silencer 38 come into contact with the bottom surface 3 of the cleaner body 2 and the contact surface can be widened, so that the frictional resistance is increased. Is also large, so that the cleaner body 2 does not fluctuate during transportation.

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

The silencer 54 has a large-diameter cylindrical portion 56 which is formed of a synthetic resin and has a peripheral wall at the center of an outer cylinder 55 bulging outward. The outer cylinder 55 is a suction joint-joined outer cylinder that is roughly divided into two in the longitudinal direction.
It is composed of 55a and an extension pipe joint outer cylinder 55b. On the side opposite to the large-diameter portion 56a on the side of the suction-joint joint outer cylinder 55a, a suction-joint joint 58 having a cylindrical small diameter for detachably joining to the suction joint of the suction port has a large-diameter portion 56a formed by the standing wall surface 60a. It is integrally molded. Small cylindrical portion that extends into the inner peripheral surface 59 of the mouth joint joint 58
Has 59a. Further, a step portion 57 for fitting the distal end portion of the extension pipe joint outer cylinder 55b is formed at the end of the mouth joint joint outer cylinder 55a.

On the other hand, the extension pipe joint outer cylinder 55b side also has a cylindrical small-diameter extension pipe joint 62 that is detachably externally joined to the extension pipe in the same manner as described above.
Is formed integrally with the cylindrical large-diameter portion 56b by the standing wall surface 60b. The inner peripheral surface 63 of the extension pipe joint 62 has a small cylindrical portion 63a extending into the large-diameter portion 56b. Here, referring to FIG. 13, a pair of connection pin receiving contact pieces 66a, 66b formed by bending a thin rinse copper plate are provided on a part of the outer periphery of the extension pipe joint portion 62.
A pair of receiving boxes 67 for mounting and holding are provided in parallel with the radial direction, and holes for connecting pins 70a and 70b to enter in the center of the front wall 67a.
72 are formed in parallel as described above. Further, the contact piece cover 73 covering the receiving box 67 presses and fixes the connection pin receiving contact pieces 66a and 66b from above by fixing means such as bonding or screws, and is fixed to the receiving box 67. On the opposite side of the receiving box 67, a rib 74 for preventing rotation is provided.
a is formed.

A receiving base 76 for inserting and supporting a pair of connecting pins 70 is provided on a part of the outer periphery of the mouth joint joint 58.
With the respective connecting pins 70a and 70b loaded into the base 76, the receiving pins 76a and 70b project from the front end surface 76a, and the connecting pins 70a and 70b are fixed to the receiving base 76 by fixing means such as screws by the cover 78. You. A rotation preventing rib 74b is formed on the opposite side of the receiving base 76.

Further, through holes 82a, 82b for passing lead wires 80a, 80b for conducting connection between the connection pins 70a, 70b and the connection pin receiving contact pieces 66a, 66b are formed in the upright wall surfaces 60a, 60b. I have.
On the connection pins 70a, 70b side of the lead wires 80a, 80b and on the connection pin receiving contact pieces 66a, 66b side, cylindrical airtight rings 84a, 84b which penetrate the lead wire 80a and hold airtightly are made of rubber or rubber. It is formed of an impermeable material such as soft vinyl chloride or urethane foam.

Further, the sound absorbing material 86 is spun and accumulated in a filament form from a polyester resin, formed into a cylindrical shape, and provided with a groove surface 88 in a part of the outer peripheral longitudinal direction. On the inner periphery of the sound absorbing material 86, a ventilation tube 90 in which a filament thread-like non-woven fabric made of a polyester resin is formed in a cylindrical shape is inserted so as to protrude from both end surfaces of the sound absorbing material 86. The air-tight rings 84a, 8 supporting the lead wires 80a, 80b are attached to the sound absorbing material 86 and the ventilation tube 90 thus configured.
At the same time, the ventilation cylinder 90 protruding from the inner peripheral parts 85a, 85b of the 4b is installed inside and the end faces 86a, 86b of the sound absorbing material 86 and the end faces of the airtight rings 84a, 84b.
83a and 83b are brought into contact with each other, and the sound absorbing material 86 has a groove structure 88 in which lead wires 80a and 80b are inserted. That is, the state is as shown in FIG. 14, and the lead wires 80a, 80
b is charged and supported.

Further, a configuration may be adopted in which a part of the sound absorbing material 86 is formed as a flat surface 88a as shown in FIG. 15, or a through hole 88b is provided as shown in FIG.

As described above, the connection pins 70a and 70b side of the 86-piece sound absorbing material assembly are inserted into the mouthpiece joint outer cylinder 55a. At this time, the connecting pins 70a and 70b are passed through the through holes 82a of the upright wall surface 60a, and the connecting pins 70a and 70b are inserted into the receiving base 76 in advance. In addition, small cylindrical part 5
Standing wall surface 60a while joining the inner periphery of ventilation tube 90 to the outer periphery of 9a
Push until the front part 83c of the airtight ring 84a comes into contact with the inner surface. In this state, the outer periphery of the sound absorbing material 86 is supported in contact with the inner surface of the large-diameter portion 56a, and at the same time, the outer periphery of the airtight ring 84a is similarly abutted. Further, the extension pipe joint outer cylinder 55b may be charged in the above-described procedure. At this time, the charging operation is adjusted so that the connection pins 70a, 70b and the connection pin receiving contact pieces 66a, 66b are in the same direction, and the tip of the extension pipe joint outer cylinder 55b is located inside the step 57 of the suction joint joint outer cylinder 55a. And the stepped portion 57
Adhering or welding around the periphery to hold it. After that, the terminals 91a, 91b of the connecting pin connecting pieces 66a, 66b are soldered with the core wires 81a, 81b of the lead wires 80a, 80b, and the receiving pins 67a are mounted inside the box 67, and the connecting piece cover 73 is covered with screws or adhesive. The connecting pin contact pieces 66a, 66b are fixedly supported by the fixing means. Further, since the connection pins 70a, 70b are inserted into the receiving base 76, the connection pins 70a, 70b are fixedly supported by the cover 78 from above and fixed by fixing means such as screws or adhesive. With this configuration, the airtight rings 84a and 84b can maintain airtightness with the inner wall surfaces of the outer joint 55a and the outer cylinder 55b.

The present invention is configured as described above, and an electric motor (not shown)
Is a silencer 54 that can be connected to an electric suction port (not shown) provided inside the suction port, and has a lead wire (not shown) for supplying power for driving the electric motor.
Accordingly, a hose insertion port (not shown) of the cleaner body (not shown) has a contact piece (not shown), and a hose joint (not shown) has a connection pin (not shown) connected to the contact piece. (Not shown)
A lead wire connected to the connection pin is provided inside the hose coating (not shown), wired to the inside of the hose handle, and provided with a contact piece at the tip thereof. A connecting pin for connecting to the contact piece is provided in the extension tube. The connection pin is connected to the lead wire, while the other lead wire side is provided with a connection pin receiving contact piece similar to that of the muffler 54, and is disposed in the extension pipe. The extension pipe joining portion 62 of the extension tube joining outer cylinder 55b of the muffler 54 is inserted and joined to one end of the connection pin receiving and contacting side of the extension tube, so that the connecting pin (not shown) on the extension tube side is connected to the joining portion 62. Through the hole 72, and is joined to the connection pin receiving contact pieces 66a, 66b. At this time, the rotation preventing rib 74a provided on the joint 62 is inserted into a groove (not shown) provided on the inner surface (not shown) of the extension tube side joint. Thereby, even if the extension pipe or the muffler 54 is rotated at the time of cleaning work at the junction between the connection pin and the connection pin receiving contact pieces 66a, 66b, they do not generate out-of-phase rotation with each other, and therefore, do not generate twist, etc. Problems such as poor contact are eliminated. Also silencer
The connection pins 70a, 70b arranged at the joint 58 of the silencer 54 are connected to the joint piece arranged at one end of the joint of the electric mouth at the mouth joint joint 58 of the mouth joint joint outer cylinder 55a of 54. Is inserted into the inner peripheral surface 59 of the joining portion 58, and is simultaneously contact-joined. At this time, the rotation preventing leave 74b is simultaneously
Is inserted into the groove in the suction joint portion, and the problem of poor contact due to torsion or the like between the contact pin and the connection pin receiving contact piece is eliminated, as described above. In addition, the extension pipe and the muffling device 54 and the axial protection between the muffling device 54 and the suction port can be supported by a connection means (not shown) such as a nipple method while urging the spring.

By connecting the respective parts as described above, when the power is turned on to the cleaner main body (not shown), the electric blower (not shown) in the cleaner main body rotates to generate suction airflow, and the hose, the extension pipe Spillover to the muffler and the suction opening, and the device becomes ready for cleaning. At this time, the airflow noise generated by the suction airflow also travels along the same path to the suction port, but while propagating in the noise reduction device 54, the airflow noise enters and exits the sound absorbing material 86 from the ventilation tube 90, and is absorbed. The reduced airflow is radiated from the mouth to the outside. Therefore, it does not generate a sound that gives a feeling of discomfort to the customer, and is excellent in usability. In addition, according to this configuration, not only is the lead wire wiring process easy, but also a notch such as a groove is provided in a part of the sound absorbing material, and the lead wire can be supported by wiring the lead wire to the notch. A separate component for holding is unnecessary and cost reduction is achieved. Further, in the present noise reduction device, it is necessary to prevent leakage from outside the outer cylinder by arranging a lead wire inside the outer cylinder. By providing the airtight ring as in the present invention, not only the above-described leak prevention but also the sound absorbing material and the end of the ventilation tube are reinforced, so that the end of the ventilation tube can be prevented from being turned up and the assembling property is improved.

In the case where the lead wire in the groove is in an unstable state such as jumping out of play and the assembling property is deteriorated, the
As shown in Fig. 17, a hard paper or thin resin or metal is wrapped around the sound absorbing material 86 and a hardened surface 92 is provided to prevent the end surface of the sound absorbing material 86 from turning up and into the outer cylinder. Can be easily incorporated. Also, sound absorbing material 86 without lead wires
The above-described hard paper or the like may be wound around the outer periphery. As a result, the outer peripheral surface including the end of the sound absorbing material is hardened, and it is difficult to turn up and the like, and the assembling property is improved. Also, sound absorbing material 86
A configuration in which the surface layers on the outer periphery and the end surface are cured by thermal processing may be adopted. By adopting these configurations, the incorporation of the silencer 54 into the inner surface of the outer cylinder 55 is improved.

Next, another embodiment of the present invention will be described with reference to FIG.

100 is a vacuum cleaner body, an electric blower (not shown),
An exhaust chamber (not shown) is built in, and a centralized exhaust pipe 102 that communicates with the exhaust chamber protrudes outward at an acute angle. The silencer 12 shown in FIG. 1 is mounted on the protruding tip. A dust collecting chamber 104 is formed with a dust bag detachably built in below,
A suction duct 106 that communicates with the dust collection bag is provided above the side surface of the dust collection chamber 104, a vibration-proof rubber 108 is provided on the bottom surface of the dust collection chamber 104, and is installed on the outdoor installation stand 110. An inlet communicating with the suction duct 106 and the pipe 107 is connected to the indoor wall 112.
A hose joint 115 is inserted into the inlet, and a hose 116, an extension pipe 118, a muffler 12, and a suction port 120 shown in FIG. 1 are sequentially connected.

In the electric vacuum cleaner configured as described above, when power is supplied to the electric blower in the main body 100 of the vacuum cleaner, a suction airflow is generated, ripples from the hose 116 to the suction port 120, and the floor surface 122 can be cleaned. On the other hand, an exhaust flow is also generated from the electric blower, passes through the exhaust chamber, passes through the centralized pipe 102, and is radiated outside from the silencer. Here, when the silencer 12 is attached to the centralized exhaust pipe 102 with an outdoor-type vacuum cleaner (hereinafter, referred to as a central cleaner) employing a centralized exhaust structure as in the present embodiment, it is necessary to reduce the frequency of 800 Hz or more. Is the most effective. Furthermore, in the case of a central cleaner, since it is not a mobile type, the size of the silencer attached to the exhaust pipe 102 is large,
In other words, with a margin for the thickness of the sound absorbing material, by increasing the thickness of the sound absorbing material, the low-frequency sound absorbing effect region is further lowered to around 500 Hz and the sound absorption volume is also increased.
With a central cleaner structure incorporating a simple and low-cost centralized exhaust structure, a very high noise reduction effect can be obtained by attaching this silencer even if the exhaust flow noise is high. As a result, when cleaning is performed in the early morning or midnight, there is no problem that the noise is caused to the neighbors and bother them, and the convenience is improved without being restricted by the cleaning time zone. In addition, the exhaust chamber can be made as small as possible, and the peripheral members, for example, a case or the like can be made small.

In addition, when installing a silencer on the exhaust chamber side, the suction airflow filtered by the dust collection bag is exhausted and exhausted, so that the sound absorbing material in the silencer does not become clogged and the ventilation cylinder is unnecessary. The structure can be simplified and greatly contributes to cost reduction. It also has improved assemblability.

In addition, in the case of a silencer installed outdoors, there is a concern that the sound absorbing material and the like may change due to weather resistance, but since it is formed of a polyester resin, it has excellent weather resistance as well as cold resistance and heat resistance. No problem.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

The sound absorbing material is formed by spinning and accumulating a polyester resin in the form of a filament, so that an infinite number of pores can be formed in an aggregate having an extremely fine fiber diameter, and the sound absorbing effect is high and the sound absorbing rate is good. In other words, the noise reduction effect on the airflow noise is very high even when the thickness is about 5 mm. Further, since the resin is used, different shapes, dimensions, plate thicknesses, fiber diameters, and fiber entanglement ratios can be easily formed, and the resin is widely used for product development and has high industrial value. And the productivity is high and the quality is stable.

The ventilator is made of filament-filament non-woven fabric made of polyester resin, which has excellent abrasion resistance. There is little occurrence of clogging and the like, and there is little deterioration in quality. In addition, since the resin is used, the thickness, fiber diameter, and the like can be easily formed, and the productivity is high and the quality is stable. Conventional non-woven fabrics are manufactured using staples (short fibers).
As a result, there is no possibility that dust will be caught by fluffing or fraying, and clogging will not easily occur. Therefore, since the ventilation tube has a two-layer structure inserted in the inner periphery of the sound absorbing material, the air flow sound is not reflected due to clogging and the sound absorbing effect of the sound absorbing material is not difficult to be obtained. Has a silencing effect.

In addition, the ventilation path surface of the nonwoven fabric is smoothed by calendering to prevent dust from being caught, and an antistatic yarn or an inhibitor is penetrated and permeated into the fibers to improve the effect of preventing adhesion of dust. A treatment method aimed at preventing adhesion of dust, such as reducing water absorption and moisture absorption by infiltrating a fluorine resin or the like to reduce water absorption and repellency, is easy, and has an effect of greatly contributing to sound absorption performance.

In addition, with the two-layer structure as described above, a slight air layer can be formed between the outer circumference of the ventilation cylinder and the inner circumference of the sound absorbing material, so that the sound absorbing effect is further enhanced.

Since the sound-absorbing material and the ventilation tube are made of polyester resin, they have little moisture absorption and water absorption.

Also, it is excellent in antiseptic properties without being attacked by molds and bacteria, and is extremely hygienic without adhering to dust when it absorbs dust. In addition, since it has excellent effects of weather resistance, cold resistance, heat resistance, and water absorption, it is possible to obtain a stable sound absorbing effect over a long period without wetting or deterioration especially for a silencer installed outdoors.

Hardening the surface layer by heat processing the outer surface of the sound absorbing material,
Alternatively, by employing a configuration in which the winding is made of hard paper, non-woven resin, metal, or the like, turning over of the silencer outer cylinder does not occur, and the assembling property is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention, FIG. 2 is a front view showing a conventional example, FIG. 3 is a characteristic diagram of one embodiment of the present invention, and FIG. FIG. 5 is a perspective view of another embodiment of the present invention, FIG. 6 is a partial cross-sectional view of another embodiment of the present invention, and FIG. 7 is a cross-sectional view of another embodiment of the present invention. 8, FIG. 8 is a partial longitudinal sectional view of FIG. 7, FIG. 9 is a working state diagram using FIG. 7, FIG. 10 is a working state diagram using the conventional example, and FIG. FIG. 12 is a storage state diagram incorporating FIG. 7, FIG. 12 is a cross-sectional view of another embodiment of the present invention, FIG. 13 is a partial perspective view of FIG. 12, and FIG. 15 and 16 are cross-sectional views of another embodiment of FIG. 12, FIG. 17 is a perspective view of another embodiment of the present invention, and FIG. 18 is a perspective view of another embodiment of the present invention. It is a front view. 12,38,38a, 54 …… Silencer, 14,40,55 …… Outer cylinder, 28,28a
…… Ventilation tube, 26,26a, 86 …… Sound absorbing material, 4,9,12,11,102 ……
Path, 34a: Fiber diameter, 88: Groove surface, 88a: Flat surface, 88
b: Through hole, 92: Surface hardened part.

Continuation of front page (56) References JP-A-54-105627 (JP, A) JP-A-2-307418 (JP, A) JP-A-3-63022 (JP, A) JP-A-54-162856 (JP) , A) Japanese Utility Model Showa 58-91354 (JP, U) Japanese Utility Model Utility Model Hei 2-15058 (JP, U) Japanese Patent Publication No. 63-57 (JP, B2)

Claims (11)

(57) [Claims] 1. An outer cylinder made of a synthetic resin, a ventilation cylinder formed of a filament-shaped non-woven fabric of a polyester resin in a cylindrical shape, and a sound absorbing material inserted between the outer cylinder and the ventilation cylinder. An electric vacuum cleaner comprising: a muffling device in which the sound absorbing material is spun and accumulated in a filament form from a polyester resin. 2. The vacuum cleaner according to claim 1, wherein the sound absorbing material and the ventilation tube are mixed with an antistatic agent or an antistatic thread. 3. The vacuum cleaner according to claim 1, wherein the sound absorbing material and the ventilation tube are subjected to a water-repellent treatment on both or only the ventilation tube. 4. The vacuum cleaner according to claim 1, wherein the ventilation tube is calendered. 5. The vacuum cleaner according to claim 1, wherein a hardened portion is formed on the outer peripheral surface and both end surfaces by heat treatment or the like. 6. A vacuum cleaner, wherein the sound absorbing material according to claim 1 is provided with a hardened surface on the outer peripheral surface thereof by being wound with a hard paper, a nonwoven fabric, a thin synthetic resin or a metal thin plate. 7. The vacuum cleaner according to claim 1, wherein the sound absorbing materials are arranged and collected so that the diameter of the filament yarn becomes smaller toward the outer peripheral surface. 8. The vacuum cleaner according to claim 1, wherein the thickness of the cylindrical cross section is made uneven. 9. The sound absorbing material according to claim 1, wherein a flat surface, a thin surface, or a through hole is formed in a longitudinal direction of the outer peripheral surface, and a lead wire for supplying power to the flat surface, the thin surface, or the through hole is provided. Characterized vacuum cleaner. 10. An electric vacuum cleaner according to claim 1, wherein the ventilation tube is formed by laminating two nonwoven fabrics having different ventilation resistances. 11. A sound absorbing device according to claim 1, wherein the sound absorbing material spun and accumulated in the form of a filament thread made of a polyester resin is formed into a cylinder and a polygonal tube, and the sound absorbing material is formed into a sound damping device. An electric vacuum cleaner, wherein the muffler is installed in an exhaust flow path of a vacuum cleaner.