JP3874963B2 - Electric vacuum cleaner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric vacuum cleaner or an electric vacuum cleaner provided with a sound absorbing material that suppresses noise generated by intake and exhaust.
[0002]
[Prior art]
Conventionally, a vacuum cleaner using an electric blower having a large output is known. In such a vacuum cleaner, the noise generated by the electric blower and the noise generated by air intake / exhaust are large, so the exhaust air passage is lengthened or the cross-sectional area of the exhaust air passage is increased. We are trying to suppress it.
[0003]
However, when the exhaust air passage is lengthened or the cross-sectional area of the exhaust air passage is increased, there is a problem that the main body becomes large.
[0004]
Therefore, a vacuum cleaner has been proposed in which a sound absorbing material is provided in the exhaust air passage to reduce noise.
[0005]
[Problems to be solved by the invention]
However, in such a vacuum cleaner, it is necessary to increase the thickness of the sound absorbing material in order to sufficiently suppress noise, and if the sound absorbing material is increased, the cross-sectional area of the exhaust air passage is reduced. As a result, there arises a problem that the suction rate is lowered. Further, if a sound absorbing material having a large weight is used without increasing the thickness of the sound absorbing material, there arises a problem that the weight of the main body is increased.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum cleaner capable of sufficiently suppressing noise without making the sound absorbing material thick and without increasing the weight per unit area. It is in.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is directed to a sound-absorbing material in which an electric blower is installed in an air passage formed in a vacuum cleaner body, and noise generated by the electric blower or noise generated by intake and exhaust is suppressed. A vacuum cleaner provided in the air passage,
The sound absorbing material is configured by stacking a first sound absorbing member and a second sound absorbing member that is thinner than the first sound absorbing member and has air permeability,
The sound absorbing material is arranged with the second sound absorbing member side facing the wind side,
The first sound absorbing member is made of felt and is configured so as not to have substantially air permeability,
The second sound absorbing member is a woven fabric or a non-woven fabric .
[0008]
The invention of claim 2 is characterized in that a small hole is provided in the second sound absorbing member .
[0009]
The invention according to claim 3 is characterized in that the first sound absorbing member and the second sound absorbing member are bonded or sewn in the form of dots or lines .
[0012]
[Embodiment]
Embodiments of a vacuum cleaner according to the present invention will be described below with reference to the drawings.
[First Embodiment]
In FIGS. 1 and 2, reference numeral 20 denotes an electric vacuum cleaner main body, and a dust collection chamber 21 is provided in the main body 20. In the main body 20, an electric chamber (housing chamber) 22 and a cord reel chamber 24 are juxtaposed behind the dust collection chamber 21, and an exhaust chamber 23 is provided behind the electric chamber 22. A plurality of exhaust ports 25 for communicating the exhaust chamber 23 and the outside air are formed in the rear wall 20 </ b> A of the main body 20, and an exhaust filter 26 is attached to the inner surface side of the exhaust port 25. The dust collection chamber 21, the electric chamber 22, and the exhaust chamber 23 form an air passage that communicates from the hose connection port (not shown) of the main body 20 to the exhaust port 25. A support wall 12 having a hole 11 extending in the vertical direction is provided below the rear wall 20A.
[0013]
The dust collection chamber 21 and the motor chamber 22 are partitioned by a partition wall 28, the motor chamber 22 and the cord reel chamber 24 are partitioned by a partition wall 29, and the motor chamber 22 and the exhaust chamber 23 are partitioned by a motor chamber cover 30. . The electric chamber cover 30 is attached to the partition wall 29 and the like.
[0014]
A dust collection filter (not shown) is provided in the dust collection chamber 21, an electric blower 40 is installed in the electric chamber 22, and a cord reel 32 is installed in the cord reel chamber 24.
[0015]
The electric blower 40 includes a centrifugal fan (not shown) and an electric motor (not shown) that rotates the centrifugal fan. The centrifugal fan is housed in a cylindrical fan case 41, and the electric motor is a cylindrical motor case 42. It is stored in. A plurality of exhaust ports 43 are formed in the motor case 42, and a bearing portion 44 that covers the bearing of the electric motor protrudes from the rear surface of the motor case 42. 45 is a carbon brush.
[0016]
The bearing portion 44 is supported by a rubber support member 15 as shown in FIG. The support member 15 includes a holding plate portion 17 having a hole 16 into which a bearing portion 44 is fitted, and a support plate portion 18 integrally formed on the back surface of the holding plate portion 17. The support plate portion 18 is pressed into the hole 11 of the support wall 12 and supported by the support wall 12.
[0017]
A vibration-absorbing rubber cover 46 is attached to the fan case 41, and the motor case 42 is covered with a rectifying cover K made of urethane, and this cover K has a large air permeability. .
[0018]
The electric chamber cover 30 includes a flat cover wall portion 31 that partitions the electric chamber 22 and the control chamber 47 formed thereon, and a hanging wall portion 32 that hangs down from the rear portion of the cover wall portion 31. Yes. A recess 33 is formed in the central portion of the lower portion of the hanging wall portion 32, and the hanging wall portion 32 is in a state straddling the support plate portion 17 supported by the support wall 12 by the recess 33.
[0019]
A gap D spaced apart by a predetermined distance is formed between the lower portion 32a of the hanging wall portion 32 (see FIG. 6) and the bottom wall portion 20T of the main body 20, and the motor chamber 22 and the exhaust chamber 23 communicate with each other through the gap D. ing. A sound absorbing material 50 is disposed in the electric chamber 22 and the exhaust chamber 23.
[0020]
As shown in FIGS. 4 and 5, the sound-absorbing material 50 is a thin-film nonwoven fabric having a slight air permeability on the surface of the first sound-absorbing member 51 made of felt (the fiber is cut and finished to a constant thickness). A sheet (second sound-absorbing member) 53 made of paper or fibers) is bonded in a dot shape, and a plurality of small holes 52 are formed in the sheet 53. The first sound absorbing member 51 has almost no air permeability, and the sheet 53 has a slight air permeability, but has a much larger air permeability than the first sound absorbing member 51. . Reference numeral 53a denotes a dotted adhesive surface.
[0021]
The sound absorbing material 50 extends upward while curving from a base portion 55 spread on the bottom portions 22A and 23B of the electric chamber 22 and the exhaust chamber 23, and a rear portion (right side in FIG. 4) of the base portion 55. A curved portion 56 in contact with the curved portion 20b of the rear wall 20A, a side wall portion 57 extending upward from one side portion of the base portion 55, a side wall 20B of the main body 20 and the vehicle bearing portion extending upward from the other side portion. Side wall portions 58 and 59 in contact with 20C are integrally formed. The curved portion 56 is formed with a notch 56A into which the support wall 12 of the main body 20 is inserted. Further, a hole (not shown) is formed in the base portion 55, and the screw boss NB passes through the hole.
[0022]
Next, the operation of the vacuum cleaner configured as described above will be described.
[0023]
When the electric blower 40 is driven, a centrifugal fan (not shown) is rotated by the electric motor. As the centrifugal fan rotates, the dust collection chamber 21 is set to a negative pressure and air is sent into the motor case 42. The electric motor is cooled by this air. As shown in FIG. 6, the air fed into the motor case 42 is exhausted from the plurality of exhaust ports 43 of the motor case 42 to the electric chamber 22, and the exhausted air is a hanging wall portion 32 of the electric chamber cover 30. Therefore, it flows toward the bottom of the electric chamber 22 and hits the base 55 of the sound absorbing material 50. Then, this air flows along the base portion 55 to the exhaust chamber 23.
[0024]
The air that has flowed into the exhaust chamber 23 hits the curved portion 56 of the sound absorbing material 50, where the direction is changed and the air flows upward along the curved portion 56, via the exhaust filter 26 and the exhaust port 25 of the rear wall 20 </ b> A. Exhausted to the outside.
[0025]
Thus, the air exhausted from the exhaust port 43 of the motor case 42 strikes the base portion 55 of the sound absorbing material 50, flows along the base portion 55, and further strikes the curved portion 56 of the sound absorbing material 50. Since it flows along the curved portion 56, the noise and exhaust sound generated by the electric blower 40 are efficiently absorbed by the sound absorbing material 50.
[0026]
By the way, the sound absorbing material 50 is obtained by adhering a sheet 53 provided with a plurality of small holes 52 to the surface of the first sound absorbing member 51 made of felt. The sound absorbing effect is shown by a broken line graph in FIG. It was found to be large as shown in (A). This is because the air passing through the sheet 53 having a slight air permeability is reflected by the first sound absorbing member 51, and the reflected air collides with the air passing through the sheet 53 to cancel the sound.
[0027]
Graph (A) shows the sound absorption coefficient of the sound absorbing material 50 when the thickness of the felt is 5 mm. Graph (B) shows the sound absorption coefficient when only the felt (first sound absorbing member) having a thickness of 10 mm is used. C) shows the sound absorption coefficient when it is composed only of a felt (first sound absorbing member) having a thickness of 5 mm. FIG. 7 (b) shows that when the sound absorbing material 50 of the present embodiment is used in a vacuum cleaner (1), when only 10 mm felt is used (2), when only 5 mm felt is used ( The relationship between the noise level and the frequency in 3) is shown in a graph. From these graphs (1), (2), and (3), it can be seen that the noise using the sound absorbing material 50 is smaller.
[0028]
As is clear from the graph shown in FIG. 7, since the sound absorption efficiency can be increased without increasing the thickness of the felt, it is necessary to increase the length and cross-sectional area of the exhaust air passage that is the electric chamber 22 and the exhaust chamber 23. In addition, the weight of the sound absorbing material 50 is light because the felt is thin.
[0029]
Therefore, the weight of the main body 20 can be reduced without increasing the size, and noise can be sufficiently suppressed. Moreover, since the thickness of the felt is thin, it is not necessary to reduce the work rate of the electric blower 40.
[0030]
Since the sound absorbing material 50 of this embodiment is obtained by adhering the sheet 53 to the felt in the form of dots, the production is simple and inexpensive. Moreover, since the sound absorbing material 50 is almost an integral product, its handling is easy, its arrangement becomes easy, and a stable noise suppression effect can be obtained.
[0031]
In the above embodiment, the sound absorbing material 50 is disposed in the electric chamber 22 and the exhaust chamber 23. However, it may be in the air path between the hose connection port of the main body 20 and the exhaust port 25. For example, the dust collection chamber 21 You may arrange in. Moreover, although the sheet | seat 53 is affixed over the whole surface of the 1st sound absorption member 51, you may affix the sheet | seat 53 on a part of the surface. Moreover, although the sheet | seat 53 is adhere | attached on the 1st sound absorption member 51, you may stop with a staple.
[Second Embodiment]
8 and 9 show the second embodiment. In this second embodiment, a sheet 61 made of a woven fabric provided with a large number of small holes 60 is adhered to the surface of the felt 51 in the form of dots. Therefore, the same effect as described above can be obtained. Reference numeral 61a denotes a dotted adhesive surface.
[Third Embodiment]
FIGS. 10 and 11 show a third embodiment. In this third embodiment, a sheet 63 made of a nonwoven fabric provided with a large number of small holes 62 is sewn on the surface of the felt 51 in the form of dots. Yes, the same effect as described above can be obtained. 63a indicates a point-like sewing point.
[0032]
12 and 13 show another example. In this example, the sheet 63 is sewn linearly on the surface of the felt 51. 63b shows a sewing location.
[Fourth Embodiment]
14 and 15 show a fourth embodiment. In this fourth embodiment, a sheet 65 made of a woven fabric provided with a large number of small holes 64 is adhered to the surface of the felt 51 on a line. Thus, the same effect as described above can be obtained. Reference numeral 65a denotes an adhesion location.
[0033]
16 and 17 show another example. In this example, the sheet 65 is sewn on the surface of the felt 51 in a line shape.
[0034]
【The invention's effect】
As described above, according to the invention of claim 1, it is possible to increase the sound absorption efficiency without increasing the thickness of the first sound absorbing material, and therefore it is necessary to increase the length and cross-sectional area of the exhaust air passage. In addition, since the first sound absorbing material is thin, the weight of the sound absorbing material is light. Therefore, it is possible to reduce the weight without enlarging the main body and sufficiently suppress noise.
Further, since the first sound absorbing member in which is configured to have no substantially air permeable, the air passing through the second sound absorbing member having a slight air permeability is reflected by the first sound absorbing member, the reflection The air that has passed through and the air that passes through the second sound-absorbing material collide with each other, so that the sound is canceled out.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a main body of a vacuum cleaner according to the present invention.
FIG. 2 is a plan view in which a part of the main body of the electric vacuum cleaner of FIG. 1 is omitted.
FIG. 3 is an explanatory view showing an assembly order of sound absorbing materials.
FIG. 4 is a perspective view showing a sound absorbing material.
FIG. 5 is an enlarged view of a part of the sound absorbing material.
FIG. 6 is an explanatory diagram showing a flow of air exhausted from the electric transmitter.
FIG. 7 is a graph showing the sound absorption rate of the sound absorbing material.
(B) A graph showing the relationship between noise level and frequency in each sound absorbing material.
FIG. 8 is a perspective view showing a sound absorbing material according to a second embodiment.
FIG. 9 is an enlarged view of a part of the sound absorbing material of FIG.
FIG. 10 is a perspective view showing a sound absorbing material of a third embodiment.
11 is an enlarged view of a part of the sound absorbing material of FIG.
FIG. 12 is a perspective view showing another example of the third embodiment.
13 is an enlarged view of a part of the sound absorbing material of FIG.
FIG. 14 is a perspective view showing a sound absorbing material according to a fourth embodiment.
15 is an enlarged view of a part of the sound absorbing material in FIG.
FIG. 16 is a perspective view showing another example of the fourth embodiment.
FIG. 17 is an enlarged view of a part of the sound absorbing material in FIG. 16;
[Explanation of symbols]
20 Vacuum Cleaner Body 22 Electric Chamber 23 Exhaust Chamber 40 Electric Blower 50 Sound Absorbing Material 51 First Sound Absorbing Material 53 Second Sound Absorbing Material

Claims (3)

An electric blower is installed in an air passage formed in the main body of the vacuum cleaner, and a noise absorbing material that suppresses noise generated by the electric blower or noise caused by intake and exhaust is provided in the air passage,
The sound absorbing material is configured by stacking a first sound absorbing member and a second sound absorbing member that is thinner than the first sound absorbing member and has air permeability,
The sound absorbing material is arranged with the second sound absorbing member side facing the wind side,
The first sound absorbing member is made of felt and is configured so as not to have substantially air permeability,
The vacuum cleaner , wherein the second sound absorbing member is a woven fabric or a non-woven fabric . The electric vacuum cleaner according to claim 1, wherein a small hole is provided in the second sound absorbing member . The vacuum cleaner according to claim 1 or 2, wherein the first sound absorbing member and the second sound absorbing member are bonded or sewn in a dot shape or a line shape .

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