JPS61115529A - Electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a vacuum cleaner, and particularly to a vacuum cleaner equipped with an exhaust flow path configuration and effective means for reducing noise.

[Background of the invention]

As for conventional noise reduction structures, various systems have been considered, as described in the publications related to Utility Model Application No. 59-45055, Japanese Patent Application Publication No. 58-146322, and Japanese Patent Publication No. 51-43315. However, the air-tightness of the flow path and the structure of the sound-absorbing material may not be properly arranged, or the air-tightness may be insufficient and a lot of sound leaks, resulting in insufficient effective structure and poor sound-damping effect. However, no proposals with good assemblability could be obtained.

[Purpose of the invention]

The present invention aims to improve the above-mentioned drawbacks, and to provide a vacuum cleaner having a configuration that achieves airtightness and sound absorption in the exhaust passage with a small number of parts, is easy to assemble, and can realize low noise. That is the purpose.

[Summary of the invention]

The vacuum cleaner according to the present invention has an air intake port on the side, a dust collection chamber equipped with a dust collection filter inside, an electric blower communicating with the dust collection filter, and an exhaust port. An exhaust duct communicating with the exhaust port is formed at the bottom of the vacuum cleaner body, and
An insertion pipe extending from a sound insulating case surrounding the electric blower is connected to this exhaust duct.

Further details are as follows.

The present invention surrounds the electric blower, which is the source of the sound, with a sound insulating case, so that the exhaust air can be directly transmitted without leaking to other parts of the vacuum cleaner body.
The exhaust passage is configured to communicate with the exhaust duct related to the exhaust passage arranged at the bottom of the main body, and an insertion pipe having an area smaller than the cross-sectional area of the exhaust duct connects the sound insulating case and the exhaust duct to form an exhaust flow path. It was designed to do so.

Further, in the present invention, airtightness is achieved by using a part of the sound absorbing material attached to the exhaust flow path.

[Embodiments of the invention]

Embodiments of the vacuum cleaner according to the present invention will be described with reference to the drawings.

Here, FIG. 1 is a partially opened cross-sectional view of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-B in FIG. 1, and FIG. A perspective view with the bottom case removed;
FIG. 4 is a comparison diagram of the frequency characteristics.

In the figure, 1 is the vacuum cleaner body, and 2 is the dust collection filter.

3 is a dust collection room, 4 is an electric blower, 5 is a vibration-proof rubber (large), 6
is anti-vibration rubber (small), 7 is a sound insulation case, 8 is a sound absorption cover,
9 is a sound absorbing material, 10 is an exhaust duct, 11 is an insertion tube, 12 is an exhaust port, 13 is an intake port, 14 is a cord reel, 15 is a power cord, 16 is a lower wooce.

17 is a bottom case, 17a is an open end, 18, 19 is a sound absorbing material, and 19a is a protruding portion of the sound absorbing material 19.

The lower case 16 is a part that extends from the rear to the front end at the bottom of the vacuum cleaner body 1.

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 with anti-vibration rubber (large) 5 and anti-vibration rubber (small) 6 that provide vibration isolation and airtightness. It is adapted to be attached to the vacuum cleaner main body 1. That is, although not shown, it is attached to the vacuum cleaner main body 1 on the vertical side of the plane of FIG. 1 with a vibration isolating material such as rubber interposed therebetween.

In addition, a sound absorbing cover 8 is provided between the sound insulating case 7 and the electric blower 4.
A breathable sound absorbing material 9 is arranged on the electric blower 4 side 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 pipe 11, and the inlet and outlet of this insertion pipe 11, that is, the side of the sound insulation case 7 and the exhaust The connecting portion on the duct 1o side is smoothly connected by a curved portion having an radius. The cross-sectional area of the passage between the insertion tube 11 and the exhaust duct 10 is such that the cross-sectional area of the insertion tube 11 is smaller than that of the exhaust duct 10. The exhaust duct 10 passes through the bottom of the cleaner body 1 and communicates with exhaust ports 12 provided on the sides (both sides) of the cleaner body.

Inside this exhaust duct 10 and insertion tube 11, a sound absorbing material 18.
19 is pasted, especially the sound absorbing material 19 that is pasted on the inner surface of the exhaust duct 10.

As shown in the protruding portion 19a shown in FIG.
When installed, it is installed in a compressed state and is 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 to start the electric blower 4.
Airflow containing a large amount of dust 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 filtered by the dust collection filter 2 disposed in the dust collection chamber 3. , dust and clean air are separated and filtered, and only the clean air rectifies and passes through the sound absorbing material 9, passes through the electric blower 4, enters the sound insulation case 7, and the air compressed inside the electric blower 4 is sent here. It expands once.

The sound insulating case 7 insulates wind noise, ball bearing rotation noise, etc. generated from the electric blower 4, and some of the noise is damped 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 disposed 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.

By attaching the bottom case 17 to the bottom case 16 of the vacuum cleaner main body 1, the protruding portion 19a of the sound absorbing material 19 attached to the inside of the exhaust duct 10 is compressed between the bottom case 16 and the bottom case 16. Therefore, the bottom case 17 and the lower case 16 do not require any special airtight sealing member.

In addition, the sound insulation case 7 containing the electric blower 4 is assembled into the vacuum cleaner main body 1, and the lower case 16° and the bottom case 17 are assembled.
A sound deadening structure can be easily constructed by simply incorporating the following in order.

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

(1) The entire electric blower is covered with a sound insulating case, and
Since the exhaust flow path does not utilize the shape of other parts of the vacuum cleaner and is separate from them, the soundproof case can be doubled.

Wind noise generated by the exhaust flow and the electric blower section
(1) The generated mechanical noise does not leak and passes through a dedicated exhaust flow path to the exhaust port, so it can be effectively muffled.

(2) An insertion pipe that communicates from the sound insulation case to the exhaust duct;
The cross-sectional area of the exhaust duct is smaller than the cross-sectional area of the sound insulating case, exhaust duct, etc., so the exhaust flow expands in the sound insulating case, is compressed in the insertion tube, and expands again in the exhaust duct to reduce noise energy. The exhaust flow path configuration was obtained, and the effect is evident in the frequency characteristics shown in Figure 4, as is clear from the comparison between the characteristics shown by the white circles of the conventional method and the characteristics shown by the black circles of the improved method according to the present invention. It is clear, and the overhaul of the sound pressure level has also been reduced by 5 to 3 dB (A).

(3) Smooth corner radius (R) for the entrance and exit of the insertion tube.
), it is possible to minimize wind noise when the insertion tube flows in and out.

(4) Since the exhaust path can be constructed independently and continuously, the exhaust flow will not leak from gaps such as the cord pull-out portion and the mating portion of the case.

(5) For assembly, the sound-absorbing structure can be easily constructed by simply assembling the sound-insulating case containing the electric blower into the vacuum cleaner body, and then assembling the lower case and the bottom case 17 in order. It is possible to minimize variations in the silencing effect due to

(6) Since the exhaust duct can be attached externally to the bottom of the vacuum cleaner body, the exhaust cross-sectional area can be easily changed by simply replacing the lower case, and the exhaust duct can be assembled accurately and easily. .

(7) Since the exhaust duct is installed at the bottom of the vacuum cleaner body,
The flow path of the exhaust duct can be configured to be long, and since the flow path is not narrowed by component parts, the flow path can be configured straight and smooth, so that the exhaust flow does not occur when it hits a protrusion. Wind noise can be prevented.

In this embodiment, airtightness is maintained by the protruding part 19a, but in addition, this protruding part is not provided, and the sound absorbing material 19 is made of a protruding part hanging down from the lower case 16 side.
It is also possible to compress the .

〔Effect of the invention〕

According to the present invention, it is possible to obtain a vacuum cleaner that can effectively muffle airflow noise and mechanical noise generated from an electric blower and has a sound-muffling structure that is easy to assemble, and is an excellent invention in practical use. Can be done.

[Brief explanation of drawings]

FIG. 1 is a partially opened sectional view of a vacuum cleaner according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A-B in FIG. 1.
FIG. 3 is a perspective view with the bottom case removed, and FIG. 4 is a comparison diagram of its frequency characteristics. 1... Vacuum cleaner body, 2... Dust collection filter, 3...
・Dust collection room, 4... Electric blower, 5... Anti-vibration rubber (large), 6... Anti-vibration rubber (small), 7... Sound insulation case, 8
...Sound absorbing cover, 9...Sound absorbing material, 10...Exhaust duct, 11...Insertion pipe, 12...Exhaust port, 13...
・Intake port, 14... Cord reel, 15... Power cord, 16... Lower case, 17... Bottom case, 17
a...Opening end, 18.19...Sound absorbing material, 19a...
・Protruding parts.

Claims (1)

[Claims] 1. An intake port is provided on the side, a dust collection chamber in which a dust collection filter is arranged, and an electric blower communicating with the dust collection filter are provided inside, and an exhaust port is formed. An exhaust duct communicating with the exhaust port is formed in the lower part of the vacuum cleaner body, and an insertion pipe extending from a sound insulating case surrounding the electric blower is connected to the exhaust duct. vacuum cleaner. 2. A vacuum cleaner according to claim 1, wherein the exhaust duct is constituted by a bottom case attached to the lower part of the vacuum cleaner body. 3. A vacuum cleaner according to claim 2, wherein a sound absorbing material is provided on the inner surface of the bottom case so as to serve also as an airtight packing.