JPH0547204B2 - - 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 sound deadening structure that is effective in reducing noise.

[Conventional technology]

Examples of noise reduction structures in conventional 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, and JP-A-58.
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.

Further, the noise reduction structure described in the above publication is not intended to change the cross-sectional area of the exhaust passage from the electric blower to the exhaust port.

[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.

Furthermore, the conventional noise reduction structure described above has a problem in that the cross-sectional area of the exhaust passage cannot be easily changed without disassembling the cleaner body.

In view of the above-mentioned problems, it is an object of the present invention to easily change the cross-sectional area of the exhaust passage, and to reduce the wind noise generated by the exhaust flow and the mechanical noise generated in the motor part of the electric blower from the vacuum cleaner body. To provide a vacuum cleaner which can obtain a large noise silencing effect by suppressing leakage from the top and side surfaces of the vacuum cleaner.

[Means to solve the problem]

The above object is a horizontally elongated vacuum cleaner that is equipped with a 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. an exhaust passage that communicates with a sound insulation case that surrounds the electric blower and the exhaust port, and communicates the sound insulation case and the exhaust passage with an insertion pipe having a cross-sectional area smaller than the cross-sectional area of the exhaust passage; In addition, in the vacuum cleaner in which the sound insulating case and the exhaust passage are airtightly communicated, a boat-shaped bottom case is attached to the outer bottom of the vacuum cleaner body, and the exhaust passage is connected to the inside of the bottom case. This is achieved by making a space communicate with the exhaust port, and further by configuring the exhaust passage so that the cross-sectional area of the passage is narrowed at least once up to the exhaust port.

[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 outer 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. In the exhaust passage, the cross-sectional area of the passage is narrowed, so the exhaust flow is compressed and expanded. Therefore, the sound energy contained in the exhaust flow is effectively reduced.

Further, 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 outer 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. Moreover, mechanical noise and wind noise transmitted to the outside of the bottom of the bottom case forming the exhaust passage are blocked by the cleaning surface such as the floor, so that the noise reaching the user is suppressed.

Furthermore, by attaching a boat-shaped bottom case to the outer bottom of the vacuum cleaner body, an exhaust passage is formed at the bottom of the vacuum cleaner body. When it is desired to change the cross-sectional area of the exhaust passage, it is easy to simply replace the bottom case with a different shape. Moreover, since the exhaust passage is formed by the boat-shaped bottom case on the outer bottom of the horizontally long vacuum cleaner body, the exhaust passage can be made sufficiently long and smooth without increasing the size of the vacuum cleaner body. It is possible to configure

〔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. FIG. 4, a perspective view with the bottom case removed, is a comparison diagram of frequency characteristics.

In the figure, 1 is the vacuum cleaner body, 2 is the dust collection filter,
3 is a dust collection room, 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 is a sound-absorbing cover, 9 is a sound-absorbing material, 10 is an exhaust passage, 11 is an insertion 12 is an exhaust port, 13 is an intake port, 14 is a cord reel, 15 is a power cord, 16 is a lower case, 17 is a boat-shaped bottom case, 17a is an open end,
18 and 19 are sound absorbing materials, and 19a is a protruding portion of the sound absorbing material 19.

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

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
is attached to and surrounded by a sound insulating case 7 by a first vibration isolating rubber 5 and a second vibration isolating rubber 6 that provide vibration isolation and airtightness. It can be attached to. In other words, although not shown,
A vibration isolating material such as rubber is interposed between the vacuum cleaner body 1 and the vacuum cleaner body 1 on the vertical side of the paper in FIG.

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

The cross-sectional area of the insertion tube 11 and the exhaust passage 10 is such that the cross-sectional area of the insertion tube 11 is smaller than that of the exhaust passage 10. In addition, exhaust passage 1
0 passes through the bottom of the vacuum cleaner body 1 and communicates with exhaust ports 12 provided on the sides (both sides) of the cleaner body.

Sound absorbing materials 18 and 19 are pasted inside the exhaust passage 10 and the insertion tube 11. In particular, the sound absorbing material 19 pasted on the inner surface of the exhaust duct 10 has a protruding portion 19a shown in FIG. It is attached so as to protrude from the open end 17a of the bottom case 17, which is shaped like the bottom of a boat, and when attached to the bottom case 16, it is attached in a compressed state, making it airtight.

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.

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

Therefore, this exhaust passage 10 is connected to the vacuum cleaner main body 1.
By attaching the bottom case 17 to the bottom case 16, the protruding portion 19a of the sound absorbing material 19 attached inside the bottom case 17 is compressed between the bottom case 16 and the bottom case 16. Furthermore, no special airtight sealing member is required.

Also, when assembling, the electric blower 4 is attached to the vacuum cleaner body 1.
Incorporate the sound insulation case 7 containing the
6. The silencing structure can be easily constructed by simply assembling the bottom case 17 in order.

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

(1) The entire electric blower 4 is covered with a sound insulating case 7,
Moreover, the bottom case 17 that constitutes the exhaust flow path does not use the shape of other parts of the vacuum cleaner and is separate from them, so the soundproof case can be doubled. , the lower case 1 does not leak wind noise generated by the exhaust flow or mechanical noise generated by the electric blower.
6 and the bottom case 17, and the exhaust port 12 is connected to the exhaust port 12, so that the sound can be effectively muffled.

(2) Since the cross-sectional area of the insertion tube 11 communicating from the sound-insulating case 7 to the exhaust passage 10 is smaller than the cross-sectional area of the sound-insulating case 7, the exhaust passage 10, etc.,
An exhaust flow path configuration is obtained in which the exhaust flow is expanded in the sound insulating case 7, compressed in the insertion tube 11, and expanded again in the exhaust passage 10 to reduce noise energy. As is clear from the comparison between the characteristics shown by the white circles and the characteristics shown by the black circles of the improved method according to this example, the effect is clear, and the overhaul of the sound pressure level has also been reduced by 5 to 3 dB(A). There is.

(3) 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.

(4) Since the exhaust flow path 10 can be configured to be independent and continuous, the exhaust flow will not leak from gaps such as the cord pull-out portion or the mating portion of the case.

(5) To assemble, install the sound insulation case 7 containing the electric blower 4 into the vacuum cleaner body 1, and then install the lower case 16,
Since the sound deadening structure can be easily constructed by simply assembling the bottom case 17 in order, it is easy to assemble, and variation in the sound deadening effect due to assembly can be minimized.

(6) Since the bottom case 17 that constitutes the exhaust passage 10 can be attached to the outer bottom of the vacuum cleaner body 1 from the outside, the exhaust cross-sectional area can be easily changed by simply replacing the bottom case 17 with a bottom case of a different shape. In addition, the bottom case 1 that constitutes the exhaust passage 10
7 can be assembled accurately and easily.

(7) Since the exhaust passage 10 is provided at the bottom of the cleaner body 1, the exhaust passage 10 can be configured to have a long flow path.
Moreover, since the flow path is not constricted by the cleaning mechanism parts, it is possible to configure the flow path straight and smoothly, and the air flow that occurs when the exhaust flow hits a protrusion can be avoided. Sound can be prevented.

In this embodiment, airtightness is maintained by the protruding portion 19a, but in addition, the protruding portion 19a is not provided, and the sound absorbing material 19 is compressed by the protruding portion hanging down from the lower case 16 side. It is a good thing.

〔Effect of the invention〕

According to the present invention, the sound insulation case surrounding the electric blower and the exhaust passage communicating with the exhaust port are communicated with each other through the insertion pipe having a cross-sectional area smaller than the cross-sectional area of the exhaust passage, and the sound insulation case, the insertion pipe, and the exhaust passage are connected to each other. The exhaust passage is configured by attaching a boat-shaped bottom case to the outer bottom of the vacuum cleaner body and communicating the internal space of the bottom case with the exhaust port, and furthermore, the exhaust passage Since the cross-sectional area of the passage is narrowed at least once up to the exhaust port, noise such as wind noise generated by the exhaust flow and mechanical noise generated by the electric blower is prevented from flowing outside the vacuum cleaner body. Leakage is suppressed, and these noises can be effectively reduced in the insertion tube and exhaust passage, and the cross-sectional area of the exhaust passage can be easily changed by simply changing the bottom case, and To obtain a vacuum cleaner whose exhaust passage can be made sufficiently long without increasing the size of the vacuum cleaner body.

[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, which is a perspective view with the parts removed, is a comparison diagram of its frequency characteristics. 1...Vacuum cleaner body, 2...Dust collection filter, 3
... Dust collection room, 4 ... Electric blower, 7 ... Sound insulation case, 8 ... Sound absorption cover, 10 ... Exhaust duct, 1
1... Insertion tube, 12... Exhaust port, 13... Intake port, 14... Cord reel, 16... Lower case,
17...Bottom case.

Claims (1)

[Scope of Claims] 1. A horizontally elongated dust collecting chamber having an intake port on the side and a dust collecting filter disposed inside, an electric blower communicating with the dust collecting filter, and an exhaust port. a vacuum cleaner body, forming an exhaust passage communicating with a sound insulating case surrounding the electric blower and the exhaust port, and connecting the sound insulating case and the exhaust passage with an insertion tube having a cross-sectional area smaller than the cross-sectional area of the exhaust passage. In the vacuum cleaner, the sound insulating case and the exhaust passage are airtightly communicated with each other, and the exhaust passage is connected to the bottom case by attaching a boat-shaped bottom case to the outer bottom of the vacuum cleaner body. An electric cleaning device characterized in that the internal space of the case is communicated with the exhaust port, and the cross-sectional area of the exhaust passage is narrowed at least once up to the exhaust port. Machine. 2. Claim 1, characterized in that the portion that narrows the cross-sectional area of the exhaust passage is located below a large component storage area such as an electric blower or a cord reel in the vacuum cleaner main body. vacuum cleaner.