JPH0547205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner equipped with a noise reduction structure effective in reducing noise.

[Prior art] Conventional low-noise structures for vacuum cleaners include Utility Model Application No. 51-10855, Utility Model Application No. 53-42876, Utility Model Application No. 54-52865, Utility Model Application No. 59-45055, Unexamined Japanese Patent Publication 1983
Various structures have been proposed, as described in Japanese Patent Publication No. 146322 and Japanese Patent Publication No. 51-43315.

However, the noise reduction structures described in the above-mentioned publications all have a structure in which the exhaust flow discharged from the motor section of the electric blower collides with the top surface and side surface of the inner wall outside the vacuum cleaner main body.

[Problem to be solved by the invention]

In the conventional noise reduction structure described above, noise such as wind noise generated by the exhaust flow and mechanical noise generated by the electric blower's motor section is easily transmitted through the top and side surfaces of the vacuum cleaner body, resulting in a large noise reduction effect. There was a problem that there was no.

In view of the above-mentioned problems, an object of the present invention is to suppress the wind noise generated in the exhaust flow and the mechanical noise generated in the motor section of an electric blower from leaking from the top and side surfaces of the vacuum cleaner body, and to achieve a large noise reduction effect. The vacuum cleaner you get is on offer.

[Means to solve the problem]

The above purpose is to provide a horizontally long vacuum cleaner body which is provided with a dust collection chamber having an intake port on the side and a dust collection filter inside, an electric blower communicating with the dust collection filter, and an exhaust port. In the vacuum cleaner, an exhaust passage communicating with a sound insulation case surrounding the electric blower and the exhaust port is formed at the bottom of the vacuum cleaner body, wherein the sound insulation case and the exhaust passage have a cross-sectional area of the exhaust passage. This is achieved by communicating through an insertion tube with a smaller cross-sectional area, and by airtightly communicating the sound insulating case, the insertion tube, and the exhaust passage.

[Effect]

The exhaust flow discharged from the electric blower passes through the sound insulating case, is guided by an insertion tube to an exhaust passage provided at the bottom of the cleaner body, and is discharged from the exhaust port of the cleaner body.

The exhaust flow expands in the sound insulating case, is compressed in the insertion tube, and then expands again in the exhaust passage. Therefore,
The sound energy contained in the exhaust stream is effectively reduced.

Furthermore, since the sound insulating case, the insertion tube, and the exhaust passage are in airtight communication, the exhaust flow is guided to the exhaust passage provided at the bottom of the cleaner body without leaking into the cleaner body. Therefore, wind noise generated in the exhaust flow and mechanical noise generated in the motor section of the electric blower are suppressed from being transmitted through the top and side surfaces of the vacuum cleaner body. Furthermore, mechanical noise and wind noise transmitted from the exhaust passage to the outside of the bottom of the vacuum cleaner body are blocked by the cleaning surface such as the floor, so that the noise reaching the user is suppressed.

Furthermore, since the exhaust passage is formed at the bottom of the horizontally long vacuum cleaner body, the exhaust passage can be sufficiently long without increasing the size of the cleaner body.

〔Example〕

Each embodiment according to the present invention will be described with reference to each figure.

Here, FIG. 1 is a partially opened sectional view of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-B in FIG. 1, and FIG. The overall perspective view, FIG. 4, is a frequency characteristic comparison diagram.

In the figure, 1 is the vacuum cleaner body, 2 is a dust collection filter, 3 is a dust collection chamber, 4 is an electric blower, 5 is a first vibration-proof rubber, 6 is a second vibration-proof rubber, 7 is a sound insulation case, 8
1 is a sound absorbing cover, 9 is a sound absorbing material, 10 is an exhaust duct related to the intake passage, 11 is an insertion pipe, 12 is an exhaust port, 1
3 is an intake port, 14 is a cord reel, 15 is a power cord, 16 is a lower case, and 17 is a middle case.

That is, the vacuum cleaner main body 1 is provided with a dust collection chamber 3 in which a dust collection filter 2 is disposed, and an electric blower 4 communicating with the dust collection chamber 3. This electric blower 4 has a first anti-vibration rubber 5 for anti-vibration and airtight maintenance.
and the second anti-vibration rubber 6 are attached to and surrounded by a sound insulating case 7, and this sound insulating case 7 is further provided with anti-vibration support and is attached to the cleaner body 1. That is, although not shown, the vacuum cleaner main body 1 on the vertical side of the paper in FIG.
It is designed to be able to be attached by interposing a vibration isolating material such as rubber between the two.

Further, a sound absorbing cover 8 is placed between the sound insulating case 7 and the electric blower 4, and a breathable sound absorbing material 9 is placed on the inlet side of the electric blower 4 for rectifying the suction flow.

Further, the back side of the sound insulation case 7 is connected to an exhaust duct 10 provided at the bottom of the vacuum cleaner body 1 by an insertion tube 11, and the inlet and outlet of this insertion tube 11, that is, the side of the sound insulation case 7 and the exhaust duct are connected. 1
The connection part on the 0 side is smoothly connected by a curved part.

The cross-sectional area of the passage between the insertion tube 11 and the exhaust duct 10 is that the cross-sectional area of the insertion tube 11 is larger than that of the exhaust duct 10.
The cross-sectional area is smaller than that of .

Further, the exhaust duct 10 passes through the bottom of the cleaner body 1 and communicates with an exhaust port 12 provided at the front end.

Since the vacuum cleaner according to the present embodiment is configured as described above, when cleaning, the suction port 13 provided at the top of the vacuum cleaner body 1 is connected to a hose, an extension pipe, and a suction port (both not shown). ), plug the power cord 15 wrapped around the cord reel 14 into an outlet (not shown), and turn on the power switch, the electric blower 4 will be operated and the airflow containing a large amount of dust will be generated. , passes through the above-mentioned suction port, extension pipe, and hose, flows into the vacuum cleaner body 1 from the suction port 13, and is separated and filtered into dust and clean air by the dust collection filter 2 arranged in the dust collection chamber 3. Then, only the clean air rectifies and passes through the sound absorbing material 9 and is sent to the electric blower 4.
Pass through the inside, enter the sound insulation case 7, and install the electric blower 4.
The air compressed inside expands once here.

This sound insulating case 7 insulates wind noise, ball bearing rotation noise, etc. generated from the electric blower 4, and some of the sound is absorbed by the sound absorbing material 9 disposed inside.

The insertion tube 11 is set to have a narrow cross-sectional area as described above so that the exhaust flow discharged into the sound insulating case 7 is compressed again by the insertion tube 11.

Furthermore, the exhaust flow expands again in the exhaust duct 10 provided at the bottom of the vacuum cleaner body 1, and is discharged to the outside through the exhaust port 12 while reducing the sound energy contained in the exhaust flow. be.

Since this exhaust duct 10 is constructed by combining the lower case 16 and the middle case 17 of the vacuum cleaner main body 1, the lower case 16, the middle case 17, and the electric blower 4 can be inserted in this order. A sound-dampening structure can be easily constructed by simply incorporating the ivy sound-insulating case 7 and the vacuum cleaner body 1.

As described above, according to the present embodiment, the following effects can be expected in summary.

(a) The entire electric blower 4 is covered with a sound insulating case 7,
Moreover, since the exhaust duct related to the exhaust flow path is formed between the lower case 16 and the middle case 17, the soundproof case can be doubled, and wind noise generated in the exhaust flow and generated in the electric motor section can be avoided. It is possible to effectively suppress mechanical noise from leaking outside the vacuum cleaner body.

(b) Since the cross-sectional area of the insertion pipe 11 that communicates from the sound insulation case 7 to the exhaust duct 10 is set smaller than the cross-sectional area of the sound insulation case 7, the exhaust duct 10, etc., the exhaust flow expands in the sound insulation case 7 and is inserted. tube 1
1, and is repeatedly expanded in the exhaust duct 10 to reduce noise energy.The frequency characteristics shown in FIG. As is clear from the comparison with the characteristics of the improved method shown by the black circles, the effect is clear, and the overhaul of the sound pressure level has also been reduced by 5 to 3 dB(A).

(c) Since the inlet and outlet of the insertion tube 11 are connected with a smooth corner radius, wind noise when the insertion tube 11 flows in and out can be minimized.

(d) Since the exhaust passage can be configured to be independent and continuous, the exhaust flow will not leak from between the cord pull-out part, the joint part of the upper and lower cases, etc.

(e) As for assembly, the sound-absorbing structure can be created by simply stacking the lower case 16, the middle case 17, the sound-insulating case 7, and the vacuum cleaner main body 1 in this order, so it is easy to assemble and minimizes variations in the noise-absorbing effect due to assembly. I can do it.

Next, FIG. 5 is a partially opened sectional view of a vacuum cleaner according to another embodiment, and FIG. 6 is a sectional view taken along the line AB in FIG. 5.

The same reference numerals as in Figures 1 to 3 above refer to the same parts, 1A is the vacuum cleaner body, 7A is the sound insulation case, 10A is the exhaust duct related to the exhaust passage, 11A is the insertion pipe, and 12A is the exhaust duct related to the exhaust passage. is the exhaust port, 16A is the lower case, 17A is the bottom case, 18
is a convex part.

The lower case 16A is the lower part of the cleaner main body 1A and extends from the rear to the front end.

The difference between the other embodiments and the previous embodiment is that the vacuum cleaner body 1 can be seen from the back of the sound insulation case 7A.
It is connected by an insertion pipe 11A to an exhaust duct 10A related to the exhaust passage provided at the bottom of the case A, and the inlet and outlet of this insertion pipe 11A, that is, the connection between the sound insulation case 7A side and the exhaust duct 10A side are connected smoothly. Also, the exhaust duct 10
A passes through the bottom of the vacuum cleaner main body 1 and communicates with the exhaust ports 12A provided on both sides of the main body.Furthermore, in the exhaust duct 10A, the flow path is formed by four electric blowers, and the vacuum cleaner The main body 1A side is made to protrude and its flow path is narrowed.

The cross-sectional area of the passage between the insertion tube 11A and the exhaust duct 10A is such that the cross-sectional area of the insertion tube 11A is smaller than the cross-sectional area of the exhaust duct 10A.

Since the configuration of this embodiment is as described above, first, the electric blower 4 is installed as in the previous embodiment.
The clean air compressed inside enters the sound insulating case 7A, where it is once expanded.

Here, this sound insulation case 7A has the same function as the sound insulation case 7 described above.

The exhaust flow discharged into the sound insulating case 7A is compressed again by the insertion tube 11A due to the above-mentioned shape.

Further, the exhaust flow expands again in the exhaust duct 10A disposed at the bottom of the vacuum cleaner body 1A, and furthermore, in the exhaust duct 10A, the convex portion of the electric blower 4 on the cleaner body 1A side 18 is used to compress the air, and the sound energy contained in the exhaust flow is reduced while being discharged to the outside from the exhaust port 12A.

This exhaust duct 10A is constructed by attaching the bottom case 17A to the lower case 16A of the vacuum cleaner main body 1A. Therefore, during assembly, the sound insulating case 7A containing the electric blower 4 is attached to the vacuum cleaner main body 1A in order. Built-in, lower case 16A, bottom case 1
A sound deadening structure can be easily constructed by simply incorporating 7A in sequence.

In addition to the above-mentioned configuration of the sound-deadening structure, other embodiments include (a) to (e) mentioned in the previous embodiment.
In addition to the above effects, the following effects can also be expected.

(a) Since the exhaust duct 10A can be attached to the bottom of the vacuum cleaner body 1A from the outside, the exhaust cross-sectional area can be easily changed by simply replacing the lower case 16A, and the exhaust duct 10A can be assembled accurately and easily. It is something.

(b) Since the exhaust duct 10A is provided at the bottom of the vacuum cleaner body 1A, the flow path of the exhaust duct 10A can be configured to be long, and since the flow path is not constricted by any component parts, the flow path can be straight and straight. Since it can be constructed smoothly, it is possible to prevent wind noise generated when the exhaust flow hits the protrusion.

In other embodiments, in order to effectively reduce the overall height of the vacuum cleaner body 1A, the four parts of the electric blower protrude from the vacuum cleaner body 1A side and narrow the flow path. In addition, for example, when the cord reel 14 is provided on the side of the electric blower 4 so that the reel axis is orthogonal to the cord reel 14, it is possible to form an aperture below the storage area of the cord reel 14, which is a large component. It is okay to do so.

〔Effect of the invention〕

According to the present invention, the sound insulating case surrounding the electric blower and the exhaust passage formed at the bottom of the vacuum cleaner body and communicating with the exhaust port are communicated by an insertion pipe having a cross-sectional area smaller than the cross-sectional area of the exhaust passage. At the same time, the sound insulating case, insertion tube, and exhaust passage are airtightly connected, so noise such as wind noise generated by the exhaust flow and mechanical noise generated by the motor of an electric blower does not leak outside the vacuum cleaner. Thus, a vacuum cleaner can be obtained which can effectively reduce these noises in the insertion tube and the exhaust passage, and can be downsized.

[Brief explanation of the drawing]

FIG. 1 is a partially opened sectional view of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-B in FIG. 1, and FIG. 3 is a bottom case of the vacuum cleaner. Fig. 4 is a comparison diagram of its frequency characteristics;
FIG. 5 is a partially opened sectional view of a vacuum cleaner according to another embodiment, and FIG. 6 is a sectional view taken along line A-B in FIG. 5. 1,1A...Vacuum cleaner body, 2...Dust collection filter, 3...Dust collection chamber, 4...Electric blower, 7,7A
... Sound insulation case, 8 ... Sound absorption cover, 9 ... Sound absorption material, 10, 10A ... Exhaust duct related to exhaust passage, 11, 11A ... Insertion pipe, 12, 12A ...
Exhaust port, 13...Intake port.

Claims (1)

[Scope of Claims] 1. A horizontally elongated dust collection chamber with an intake port on the side and a dust collection filter inside, an electric blower communicating with the dust collection filter, and an exhaust port. A vacuum cleaner comprising a vacuum cleaner body, and an exhaust passage communicating with a sound insulating case surrounding the electric blower and the exhaust port is formed at the bottom of the vacuum cleaner body, wherein the sound insulating case and the exhaust passage are connected to the exhaust port. A vacuum cleaner characterized in that the sound insulation case, the insertion tube, and the exhaust passage are communicated with each other through an insertion tube having a cross-sectional area smaller than the passage cross-sectional area, and the sound-insulating case, the insertion tube, and the exhaust passage are airtightly communicated with each other. 2. The vacuum cleaner according to claim 1, wherein the sound insulating case and the insertion tube are integrally formed.