JP2000308605A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make restrainable a noise with a small amount of a sound absorbing material by covering a case of a motor-driven blower with a sound absorbing material for restraining a noise produced by the motor-driven blower or a noise produced by air suction and discharge. SOLUTION: The sound absorbing material 50 has a rectangular base part 51 formed of felt. The sound absorbing material 50 is installed in such a manner that a carbon brush 45 is put in the cutout 54 of the base part 51, the projecting part 55 of the base part 51 is disposed between exhaust ports 43, and the base part 51 is wound round a motor case 42. By engaging the projection 53 with the recessed part 52 of the base part 51, the base part is wound round the motor case. The sound absorbing material 50 is thus wound round the motor case, whereby designated sound absorbing effect can be heightened and a small amount of sound absorbing material 50 will be sufficient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner and a vacuum cleaner provided with a sound absorbing material for suppressing noise generated by intake and exhaust.

[0002]

2. Description of the Related Art Conventionally, an electric vacuum cleaner using an electric blower having a large output has been known. In such a vacuum cleaner, since the noise generated by the electric blower and the noise generated by the intake and exhaust of air are large, the exhaust air path is lengthened and the cross-sectional area of the exhaust air path is increased to reduce the noise. We are trying to control it.

However, there has been a problem that the body becomes large when the exhaust air path is lengthened or the sectional area of the exhaust air path is increased.

Therefore, there has been proposed a vacuum cleaner in which a noise absorbing material is provided in an exhaust air passage to suppress noise.

[0005]

However, in such a vacuum cleaner, in order to sufficiently suppress noise, the vacuum cleaner extends over the entire inner surface of a wall of an electric room or an exhaust room provided with an electric blower. With sound absorbing material. For this reason,
There is a problem that a large amount of sound absorbing material must be used and the weight increases.

[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 with a small amount of sound absorbing material.

[0007]

According to one aspect of the present invention, there is provided an electric vacuum cleaner in which an electric blower is installed in an air passage formed in a main body of the electric vacuum cleaner. A sound absorbing material for suppressing noise generated by the air blower or noise generated by air intake and exhaust is provided on the case of the electric blower.

According to a second aspect of the present invention, in the electric blower, the sound absorbing material has a concave portion at one end and a projection engaging with the concave portion at the other end, and the projection is engaged with the concave portion. It is characterized by being wrapped around a case.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vacuum cleaner according to the present invention will be described below with reference to the drawings. [First Embodiment] In FIGS. 1 to 3, reference numeral 20 denotes a vacuum cleaner main body, in which a dust collecting chamber 21 is provided. In the main body 20, an electric room (storage room) 22 and a code reel room 24 are arranged side by side behind a dust collection room 21, and an exhaust room 23 is provided behind the electric room 22. The rear wall 20A of the main body 20 has a plurality of exhaust ports 25 communicating the exhaust chamber 23 and the outside air, and an exhaust filter 26 is attached to the inner surface side of the exhaust ports 25. The dust collecting chamber 21, the electric chamber 22, and the exhaust chamber 23 are
An air passage communicating from the hose connection port (not shown) of No. 0 to the exhaust port 25 is formed.

The dust collection chamber 21 and the electric 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 power chamber 22 and the exhaust chamber 23 are partitioned by a power chamber cover 30. Have been. The electric room cover 30 is attached to the partition wall 29 and the like.

The dust collecting chamber 21 is provided with a dust collecting filter (not shown), the electric chamber 22 is provided with an electric blower 40, and the code reel chamber 24 is provided with a code reel 32.

The electric blower 40 includes a centrifugal fan (not shown) and an electric motor (not shown) for rotating the centrifugal fan.
The centrifugal fan is housed in a tubular fan case 41, and the electric motor is housed in a tubular motor case 42. As shown in FIG. 4, a plurality of exhaust ports 43 are formed in the motor case 42, and a bearing 44 that covers a bearing of the electric motor protrudes from a rear surface of the motor case 42. 45
Is a carbon brush (see FIG. 4).

A rubber cover 46 for absorbing vibration is attached to the fan case 41, a sound absorbing material 50 is wound around the motor case 42, and the sound absorbing material 50 is covered on the motor case 42. Has become. The sound absorbing material 50 is covered with a rectifying cover K made of urethane at a predetermined distance, and the cover K has a large air permeability.

The electric room cover 30 is composed of a flat cover wall 31 for partitioning the electric room 22 and a control room 47 formed thereon, and a hanging wall 32 hanging from the rear of the cover wall 31. Have. A concave portion 33 is formed in the center of the lower portion of the hanging wall portion 32, and the concave portion 33 forms
2 is in a state of straddling the bearing 44 of the motor case 42.

A gap D is formed between the lower part 32a of the hanging wall part 32 (see FIG. 5) and the bottom wall part 20T of the main body 20 so as to be separated from each other by a predetermined distance. Are in communication.

As shown in FIG. 4, the sound absorbing material 50 has a rectangular base portion 51 made of felt (which is obtained by cutting fibers and finishing it to have a constant thickness). 52 are formed, and the recess 5 is formed at the other end.
A plurality of projections 53 that engage with the projection 2 are formed. Also,
A cutout 54 and a protrusion 55 are formed on the side of the base 51.

The sound absorbing material 50 is provided with the notch 5 of the base portion 51.
4 with the carbon brush 45, and the base 5
1 is disposed between the exhaust port 43 and the exhaust port 43, the base 51 is wound around the motor case 42, and the projection 53 is engaged with the recess 52 of the base 51, whereby the motor case 42 and attached. As described above, since the sound absorbing member 50 is simply wound around the motor case 42 and the projection 53 is engaged with the concave portion 52 of the base portion 51, the winding of the sound absorbing member 50 can be easily performed. The sound absorbing material 50 can be wound around the case without need.

Next, the operation of the vacuum cleaner configured as described above will be described.

When the electric blower 40 is driven, a centrifugal fan (not shown) is rotated by the electric motor. The rotation of the centrifugal fan makes the dust collection chamber 21 a negative pressure, and at the same time, air is sent into the motor case 42. The air cools the electric motor. The air sent into the motor case 42 is, as shown in FIG.
The gas is exhausted from the plurality of exhaust ports 43 of the motor case 42 to the electric chamber 22.

The air exhausted from the exhaust port 43 is supplied to the electric chamber 2 by the hanging wall 32 of the electric chamber cover 30.
2 flows toward the bottom, and further flows to the exhaust chamber 23 along the bottom. The air flowing into the exhaust chamber 23 is exhausted by the exhaust filter 26 and the exhaust port 25 of the rear wall 20A.
It is exhausted to the outside through.

The noise generated by the electric blower 40 and the noise generated by air intake and exhaust are released to the electric chamber 22 together with the air exhausted from the exhaust port 25, and the sound absorbing material 50 is formed in the motor case 42 of the electric blower 40. The noises are absorbed by the sound absorbing material 50 because they are wound. FIG. 6 is a graph showing the relationship between the magnitude and frequency of the noise generated from the vacuum cleaner main body 20 in this case.
It is shown in (a).

On the other hand, a graph (b) of FIG. 6 shows the relationship between the magnitude and frequency of the noise generated from the main body 20 when the sound absorbing material is applied over the entire inner wall surface of the electric room 22.

From these graphs (a) and (b), it can be seen that even if the sound absorbing material 50 is simply wound around the motor case 42,
It was found that almost the same effect as when the sound absorbing material was attached over the entire inner wall surface was obtained.

As described above, the sound absorbing material 5 is
A predetermined sound absorbing effect can be improved only by winding 0, and less sound absorbing material 50 is required.
The weight of the cleaner body 20 can be reduced. [Second Embodiment] FIGS. 7 to 10 show a second embodiment, in which a sound absorbing material 70 made of felt is disposed in the electric chamber 22 and the exhaust chamber 23. FIG. .

The sound absorbing material 70 includes the electric chamber 22 and the exhaust chamber 2.
The base part 75 spread on the bottom parts 22A and 23B of the third part
A curved portion 76 extending upward while bending from a rear portion (the right side in FIG. 4) of the base portion 75 and abutting against the curved portion 20b of the rear wall 20A of the main body 20; Side wall 77 extending from the other side, the side wall 20B of the main body 20 and the vehicle bearing 20C.
Are integrally formed with the side wall portions 78 and 79 that are in contact with. The curved portion 76 has a cutout 76A into which the support wall 12 of the main body 20 enters.

According to the second embodiment, the electric blower 4
In order to absorb the noise generated from zero and the noise generated by the air absorption and exhaust by the sound absorbing material 50 and the sound absorbing material 70,
As shown in the graph of (c), the noise generated from the vacuum cleaner main body 20 is reduced. Third Embodiment FIGS. 11 to 13 show a third embodiment. In the third embodiment, a cap 80 is attached to a bearing 44 of a motor case 42. FIG. The cap 80 has a wind tunnel 81 that guides air forward (to the left in FIG. 11).
The right end (in FIG. 11) of 1 is closed by a side wall portion 82, and a hole 83 is formed in the side wall portion 82, and the bearing portion 44 of the motor case 42 is fitted into the hole 83.

According to the third embodiment, the air exhausted from the exhaust port 43 of the motor case 42 is
Is guided forward by the wind tunnel 81 of the motor case 4
2 flows along the surface of the sound absorbing material 50 wound around.
Thereby, the noise and exhaust sound generated by the electric blower 40 are efficiently absorbed by the sound absorbing material 50.

[0028]

As described above, according to the first aspect of the present invention, there is provided an electric vacuum cleaner having an electric blower installed in an air passage formed in a main body of the electric vacuum cleaner, wherein the electric blower is generated. Since the case of the electric blower is covered with a sound absorbing material that suppresses noise or noise generated by air intake and exhaust, it is possible to sufficiently suppress noise generated by the electric blower and noise generated by air intake and exhaust with a small sound absorbing material. it can.

According to the second aspect of the present invention, the sound absorbing material has a concave portion at one end and a projection engaging with the concave portion at the other end, and the projection is engaged with the concave portion to electrically operate the sound absorbing material. Since it is wound around the case of the blower, the winding can be easily performed, and the sound absorbing material can be wound around the case without requiring a separate member.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a vacuum cleaner main body according to the present invention.

FIG. 2 is a plan view in which a part of the main body of the vacuum cleaner in FIG. 1 is omitted.

FIG. 3 is an exploded perspective view of a part of the vacuum cleaner.

FIG. 4 is an explanatory view showing how to attach a sound absorbing material.

FIG. 5 is an explanatory diagram showing a flow of air exhausted from the electric sending machine.

FIG. 6 is a graph showing a relationship between noise and frequency of the vacuum cleaner.

FIG. 7 is a partial sectional view showing a vacuum cleaner main body according to a second embodiment.

FIG. 8 is a plan view in which a part of the main body of the vacuum cleaner in FIG. 2 is omitted.

FIG. 9 is an exploded perspective view of a part of the electric vacuum cleaner according to the second embodiment.

FIG. 10 is an explanatory diagram showing a flow of air exhausted from the electric blower.

FIG. 11 is a partial sectional view showing a vacuum cleaner main body according to a third embodiment.

FIG. 12 is an exploded perspective view of a part of the electric vacuum cleaner according to the third embodiment.

FIG. 13 is an explanatory diagram showing a flow of air exhausted from the electric blower.

[Explanation of symbols]

 Reference Signs List 20 vacuum cleaner main body 22 electric room 40 electric blower 42 motor case 50 sound absorbing material

Claims (2)

[Claims] 1. An electric vacuum cleaner having an electric blower installed in an air passage formed in a main body of the electric vacuum cleaner, wherein the sound absorbing material for suppressing noise generated by the electric blower or noise generated by air intake and exhaust is provided by the electric cleaner. An electric vacuum cleaner characterized by being put on a case of a blower. 2. The sound absorbing material has a concave portion at one end and a protrusion engaging with the concave portion at the other end, and the sound absorbing material is wound around a case of the electric blower by engaging the protrusion with the concave portion. The electric vacuum cleaner according to claim 1, wherein the vacuum cleaner is attached by mounting.