JP5157566B2 - Electric vacuum cleaner - Google Patents

Description

The present invention is higher sound absorbing effect in a small space is related to the electric vacuum cleaner is obtained, et al.

  Conventionally, this type of vacuum cleaner has been widely used in household vacuum cleaners, and many of them have been designed to reduce operating noise with a sound absorbing material disposed in the blower chamber. The sound-absorbing material generally has a high sound-absorbing effect in the high-frequency range, and it is difficult to reduce the low-frequency airflow sound generated in the cleaner body. In addition to selecting a heavy and thick sound absorbing material, a means of providing an air layer behind the sound absorbing material is known to improve the sound absorbing effect in the low frequency range of the sound absorbing material (for example, Patent Documents). 1).

As shown in FIG. 7, this includes a lower container 22 in which a dust collection chamber 20 having an opening 19 and an electric blower storage chamber 21 are arranged side by side, a lid 23 covering the opening 19 of the dust collection chamber 20, and electric And an upper container 24 constituting a vacuum cleaner outer shell above the blower storage chamber 21, and exhaust of the electric blower 26 flowing out from an opening 25 provided below the electric blower storage chamber 21 is exhausted from the electric blower storage chamber 21. The exhaust passage 28 formed by the sound absorbing material 27 disposed inside the outer wall and the lower container 22 is passed through the exhaust port 29 and discharged from the exhaust port 29, and between the sound absorbing material 27 and the lower container 22 at the lower rear portion of the lower container 22. A vacuum cleaner 31 in which a space 30 is formed is disclosed.
JP 11-56694 A

  However, in the conventional configuration, in order to improve the sound absorbing effect in the low frequency range of the sound absorbing material, it is necessary to enlarge the space between the sound absorbing material and the lower container, and the low frequency air flow generated in the cleaner body When it was going to reduce a sound significantly, it had the subject that a vacuum cleaner will enlarge.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a silencer capable of obtaining a high sound absorption effect over a wide band in a small space using a gas adsorbent and a vacuum cleaner using the same. To do.

In order to solve the above-described conventional problems, the vacuum cleaner of the present invention is formed of a tray-like container made of metal, a gas adsorber housed in the container and made of activated carbon, and a perforated plate. A sound-absorbing support that covers the gas adsorbent, a sound-absorbing material provided on the support, and a sound-proof case that houses an electric blower. It is fixed to the top surface in the soundproof case so as to cover the rear part of the blower, and a vent is formed between the lower end of the container and the lower inner surface of the soundproof case, and the rear inner surface of the soundproof case and the It arrange | positions so that an air path may be formed between the sound-absorbing material of a muffling means .

  As a result, the pressure fluctuation of the air in the closed space caused by the sound wave transmitted through the sound absorbing material can be suppressed by the gas adsorber adsorbing air molecules, and the effect equivalent to the expansion of the volume of the closed space can be achieved. Therefore, the air layer behind the sound absorbing material is expanded to improve the sound absorbing effect in the low frequency range, and a silencer having a high sound absorbing effect over a wide band in a small space can be realized.

In addition, the vacuum cleaner using the silencer of the present invention in the blower chamber can greatly reduce the operating noise and airflow noise of the electric blower over a wide band in the blower chamber, and can be used comfortably with low noise. It is. In addition, by arranging the sound deadening means in the soundproof case and forming the container from metal, the exhaust heat from the electric blower can be easily transmitted to the activated carbon through the metal container having high thermal conductivity, thereby drying the activated carbon. Is promoted, and more water molecules adsorbed on the activated carbon are released, so that the adsorption effect of air molecules is regenerated, and the volume expansion effect of the closed space can be maintained over a long period of time. It can be maintained for a long time.

  The silencing means of the present invention can suppress the pressure fluctuation in the closed space with the gas adsorber, improve the sound absorbing effect in the low frequency range of the sound absorbing material, and obtain a high sound absorbing effect over a wide band in a small space. Further, the electric vacuum cleaner using the silencer of the present invention can greatly reduce the operation noise and air flow noise of the electric blower over a wide band, and can perform cleaning work comfortably with low noise.

A first invention includes a tray-like container formed of metal, a gas adsorber formed of activated carbon housed in the container, and a breathable support formed of a perforated plate and covering the gas adsorber. A sound-absorbing material provided on the support;
And the silencer is fixed to a top surface of the soundproof case so as to cover a rear portion of the electric blower, and a vent hole is formed between a lower end of the container and a lower inner surface of the soundproof case. The electric vacuum cleaner is configured and arranged so as to form an air passage between a rear inner surface of the soundproof case and the sound absorbing material of the silencer .

As a result, the pressure fluctuation of the air in the closed space caused by the sound wave transmitted through the sound absorbing material can be suppressed by adsorbing air molecules by the gas adsorbent composed of activated carbon, and the volume of the closed space is expanded. Since it has the same effect, the air layer behind the sound absorbing material is expanded and the sound absorbing effect in the low frequency range is improved, and a silencer having a high sound absorbing effect over a wide band in a small space can be realized.
Further, the silencer is fixed to the top surface in the soundproof case so as to cover the rear portion of the electric blower, and a ventilation hole is formed between the lower end of the container and the lower inner surface of the soundproof case, and the soundproof case By using a vacuum cleaner arranged so as to form an air path between the rear inner surface and the sound absorbing material of the silencer, it becomes possible to significantly reduce the operating noise of the electric blower over a wide band in the blower chamber, A vacuum cleaner that can be used comfortably with low noise can be provided.
In addition, by arranging the sound deadening means in the soundproof case and forming the container from metal, the exhaust heat from the electric blower can be easily transmitted to the activated carbon through the metal container having high thermal conductivity, thereby drying the activated carbon. Is promoted, and more water molecules adsorbed on the activated carbon are released, so that the adsorption effect of air molecules is regenerated, and the volume expansion effect of the closed space can be maintained over a long period of time. It can be maintained for a long time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a configuration of a canister-type vacuum cleaner according to Embodiment 1 of the present invention. FIG. 2 is an exploded view showing the configuration of the silencer in the same embodiment.

  In FIG. 1, a vacuum cleaner 1 a is housed in a dust collection chamber 3 having a dust collection chamber 3 communicating with a main body intake port 2 and a blower chamber 5 provided with a main body exhaust port 4. The main body inlet 2 and a dust bag 7 that is airtightly attached, and an electric blower 8 installed in the blower chamber 5 are provided. A partition wall having an opening window is provided between the air blowing chamber 5 and the dust collecting chamber 3, and the electric blower 8 is arranged so that the air inlet faces the opening window of the partition wall.

  The cylindrical soundproof case 10 is housed so as to surround the electric blower 8, and the front of the soundproof case 10 has an opening larger than the intake port of the electric blower 8. Is communicated with the opening window of the partition wall. In addition, the gap between the electric blower 8 and the partition is sealed with one end of the soundproof case 10 sandwiched between the front case and the partition of the electric blower 8. Furthermore, the soundproof case 10 has a shape in which the rear top plate is bent downward and extends, and the electric blower 8 is in a state close to hermetic sealing, but the plate extending downward (the vertical plate 10a). ) And the lower inner surface of the soundproof case 10, and a standing plate 10 b rising from the bottom surface of the blower chamber 5 is provided further behind the hanging plate 10 a. And the ventilation path 9 was formed between the standing board 10b and the vertical board 10a, the silencer 11a was installed in contact with the standing board 10b in the ventilation path 9, and it was discharged | emitted from the electric blower 8 The exhaust B is discharged from the lower side to the upper side through the ventilation path 9 and further to be detoured from the upper side to the rear main body exhaust port 4.

In addition, as shown in FIG. 2, after the granular activated carbon powder, which is a gas adsorbent, is filled into the nonwoven fabric storage bag 16, the storage bag 16 is stored in the tray-like container 15a (closed space 17a). Cover with a punching metal 13a having a plurality of openings, and further onto the soft urethane material 12
And the periphery of the punching metal 13a and the container 15a is bonded and fixed to the inner surface of the container 15a. Thereby, the closed space 17a is formed in the container 15a.

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, in FIG. 1, when the vacuum cleaner 1 a is driven, a moving blade (not shown) of the electric blower 8 rotates at a high speed, the dust collection chamber 3 becomes negative pressure, and the dust collection bag 7 passes from the main body intake port 2 to the dust collection bag 7. Air A flows in. Dust contained in the air A is filtered and collected by the dust bag 7, and clean air is sucked into the electric blower 8. The exhaust B from the electric blower 8 is discharged through the air passage 9 of the soundproof case 10 and goes out of the cleaner body 6. Noise generated in the soundproof case 10 includes operating sound of the electric blower 8 and airflow sound caused by turbulent vortices generated by exhaust collision or the like. Most of the noise propagates through the air passage 9 of the soundproof case 10. I will do it.

  Here, the closed space 17a formed by the punching metal 13a and the container 15a plays the role of an air layer behind the soft urethane material 12, and the pressure fluctuation of the closed space 17a caused by the sound wave transmitted through the soft urethane material 12 is The granular activated carbon powder is suppressed by adsorbing air molecules, and has the same effect as increasing the volume of the closed space 17a. That is, since the air layer behind the soft urethane material 12 is expanded by the adsorption action of the activated carbon, the sound absorption effect in the low sound range is improved in spite of a small space, and generally only in the high sound range where the soft urethane material 12 is easy to absorb sound. Therefore, it is possible to absorb a large amount of sound even in the low sound range, and the airflow sound in the low sound range generated in the soundproof case 10 can be greatly reduced by the silencer 11a.

  Since the granular activated carbon powder is filled in the storage bag 16, the granular activated carbon powder is scattered even when there is vibration or impact when the cleaner moves during cleaning or collides with furniture. Without damaging the vacuum cleaner body. In addition to the activated carbon, a porous material such as zeolite or silica may be used as the gas adsorbent. Further, since a resonant sound absorbing structure is formed by the punching metal 13a and the closed space 17a, the sound absorption of a specific frequency can be achieved by adjusting the hole diameter of the punching metal 13a, the volume of the closed space 17a, the amount of granular activated carbon powder, and the like. The effect can be improved.

  As described above, in the present embodiment, the silencer 11a of the present invention is disposed in the air passage 9 of the soundproof case 10 of the electric vacuum cleaner 1a, so that the air behind the soft urethane material 12 is absorbed by the activated carbon. The layer is expanded to improve the sound absorption effect in the low frequency range, and the noise propagating through the air in the soundproof case 10 is greatly reduced over a wide band to provide a vacuum cleaner 1a that can be used comfortably with low noise. it can.

(Modification)
Next, the vacuum cleaner which concerns on the modification 1 of Embodiment 1 is demonstrated, referring drawings. FIG. 3 is a cross-sectional view showing the configuration of the electric vacuum cleaner according to the first modification. Parts that function in the same manner as in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 3, the electric vacuum cleaner of Modification 1 is different in that the soundproof case 10 does not have a standing plate 10 b behind the hanging plate 10 a, and the silencer 11 a is slightly different from the soundproof case 10 in the blower chamber 5. An exhaust path (ventilation path) 18 is formed between the silencer 11 a and the vertical plate 10 a of the soundproof case 10. Thus, it goes without saying that the same effects as those of the first embodiment described above can be obtained.

  Next, the vacuum cleaner which concerns on the modification 2 is demonstrated, referring drawings. FIG. 4 is a cross-sectional view showing the configuration of the electric vacuum cleaner according to the second modification. Parts that function in the same manner as in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4, in addition to the configuration of the first embodiment described above, the silencer 11a is also installed on the top surface of the blower chamber 5 (the upper inner surface of the case of the cleaner body 6). As a result, the sound absorption area can be increased, and the sound absorption effect in the cleaner body 6 can be further improved.

(Embodiment 2)
Next, the vacuum cleaner of Embodiment 2 of this invention is demonstrated, referring drawings. FIG. 5 is a cross-sectional view showing a configuration of a canister-type vacuum cleaner according to Embodiment 2 of the present invention. FIG. 6 is an exploded view showing the configuration of the silencer in the same embodiment. Note that the same elements as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In FIG. 5, the electric vacuum cleaner 1 b is in a state where the electric blower 8 is housed in the cylindrical soundproof case 10 and seals the peripheral portion of the intake port of the electric blower 8. It is fixed to the partition between. The container 15b of the silencer 11b is made of an aluminum material, is fixed to the top surface of the soundproof case 10 so as to cover the rear part of the electric blower 8, and passes between the lower end of the container 15b and the lower inner surface of the soundproof case 10. An air hole 9 is formed between the inner surface of the rear portion (standing plate 10b) of the soundproof case 10 and the soft urethane material 12 of the silencer 11b.

As shown in FIG. 6, a thin plate 13b having lattice-shaped holes is used as a support, fibrous activated carbon 14b is used as a gas adsorbent, and fibrous activated carbon 14b is placed in a tray-like container 15b. After the lid is formed with the thin plate 13b, the outer frame of the lattice-shaped thin plate 13b is bonded to the container 15b to form the closed space 17b. The soft urethane material 12 is mounted on the lattice-shaped thin plate 13b, and the outer peripheral portion of the soft urethane material 12 is bonded and fixed to the inner wall of the container 15b .

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, in FIG. 5, when the vacuum cleaner 1 b is driven, a part of the exhaust B of the electric blower 8 strikes the container 15 b of the silencer 11 b and the air path between the soft urethane material 12 of the silencer 11 b and the soundproof case 10. 9 is discharged. The heat energy generated by copper loss, iron loss and mechanical loss of the electric blower 8 is moved by the exhaust B, while the heat of the electric blower 8 is transmitted to the activated carbon 14b through the aluminum container 15b having good heat conduction. As a result, drying of the activated carbon 14b is promoted, and more water molecules adsorbed on the activated carbon 14b are released, so that the adsorption effect of air molecules is regenerated and the volume expansion effect of the closed space is maintained for a long time. And a broadband sound absorption effect can be maintained for a long time. Activated carbon has high heat resistance, so it is safe to use in high-temperature environments. The material of the container 15b may be copper, iron and other metals, but is not limited to metals, and may be a resin as long as it has a high thermal conductivity and heat resistance.

  As mentioned above, in this Embodiment, it is set as the vacuum cleaner 1b of the structure which uses the aluminum container 15b for the silencer 11b of this invention, and moves the thermal energy of the exhaust B of the electric blower 8 to the activated carbon 14b. As a result, the activated carbon 14b is dried to regenerate the air molecule adsorption effect, the volume expansion effect of the soft urethane material 12 is maintained, and the broadband sound absorption effect can be maintained over a long period of time.

Note that the configurations of the first and second embodiments described above are not limited to this, and can be appropriately combined as necessary. The fibrous activated carbon may be a cloth-like material or a thread-like material, and may be configured so as not to come out of the lattice-like thin plate. Furthermore, the metal support does not need to be sealed to the inner surface of the container.
The scattered points may be joined and fixed, or may be fixed by welding or fitting. The soft urethane material does not need to be fixed to the container with an adhesive, and may be fixed to the container using a separate fixing jig.

  As described above, the silencer according to the present invention improves the sound absorption effect in the low frequency range of the sound absorbing material by suppressing the pressure fluctuation in the closed space with the gas adsorber, and has a high sound absorption effect over a wide band in a small space. Therefore, the present invention can be applied to uses such as household and business vacuum cleaners that easily generate large noises.

Sectional drawing which shows the structure of the vacuum cleaner in the 1st Embodiment of this invention Exploded view showing the configuration of the silencer in the same embodiment Sectional drawing which shows the structure of the vacuum cleaner of other embodiment. Sectional drawing which shows the structure of the vacuum cleaner of other embodiment. Sectional drawing which shows the structure of the vacuum cleaner in the 2nd Embodiment of this invention. Exploded view showing the configuration of the silencer in the same embodiment Cross section of a conventional electric blower

1a, 1b Vacuum cleaner 11a, 11b Silencer (silencer)
12 Soft urethane material (sound absorbing material)
14b Activated carbon 15a, 15b Container 16 Storage bag (bag with air permeability)
17a, 17b closed space

Claims (1)

A tray-shaped container made of metal, a gas adsorber made of activated carbon housed in the container, a support having air permeability formed by a perforated plate and covering the gas adsorber, and the support A sound absorbing material provided, and a muffler means comprising:
A soundproof case for storing the electric blower,
The silencing means is fixed to the top surface in the soundproof case so as to cover the rear part of the electric blower,
A vent is formed between the lower end of the container and the lower inner surface of the soundproof case,
And the vacuum cleaner arrange | positioned so that an air path may be formed between the rear-part inner surface of the said soundproof case, and the sound-absorbing material of the said silencer .