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Noise reducing device

A technology for noise reduction and plate reduction, which is applied in muffler devices, measuring devices, exhaust diffusion devices, etc., and can solve the problems of large device shape, high production cost, and complexity.

Inactive Publication Date: 2008-06-25
MITSUBISHI ELECTRIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the conventional noise reduction device requires two filters and two resonance chambers, so the device is large and complicated
Therefore, there is a problem that it is difficult to assemble into home appliances
In addition, since many parts are required, there is a problem that the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] FIG. 1 is a side cross-sectional view showing a vacuum cleaner to which a noise reduction device 10 according to Embodiment 1 is applied. As shown in this figure, the vacuum cleaner 1 has a suction port 3, a dust collection chamber 4, a motor 5, a noise reduction device 10, and an exhaust port 6, and the suction port 3 is equipped with a pipe 2 for attracting garbage; the dust collection chamber 4 is arranged behind the suction port 3 to collect garbage; the motor 5 is arranged behind the dust collection chamber 4 to generate an air flow for attracting garbage; the noise reduction device 10 is arranged behind the motor 5 to reduce Generated noise; the exhaust port 6 is arranged behind the noise reduction device 10 to discharge the air flow passing through the noise reduction device 10 .

[0020] A paper bag 7 is installed on the dust collecting chamber 4 , and the garbage sucked through the suction port 3 is collected in the paper bag 7 . In addition, the motor 5 rotat...

Embodiment approach 2

[0035]Next, a noise reduction device according to Embodiment 2 will be described. Fig. 6 is a side cross-sectional view showing a vacuum cleaner to which the noise reduction device 20 according to Embodiment 2 is applied. This second embodiment is different from the first embodiment shown in FIG. 1 in that the noise reduction plate 11 surrounds the motor 5 and is arranged in a box shape. Other configurations are the same as or equivalent to Embodiment 1. In addition, the same code|symbol is attached|subjected to the same or equivalent structural part as Embodiment 1, and description is abbreviate|omitted.

[0036] The noise reduction device 20 of the present embodiment surrounds the motor 5 with five noise reduction plates 11 arranged around the motor 5 (upper, lower, left, right, and rear). Therefore, a sound attenuation chamber is formed between the noise reduction plate 11 and the motor 5, and the noise generated by the motor 5 is propagated in the sound attenuation chamb...

Embodiment approach 3

[0041] Next, a noise reduction device according to Embodiment 3 will be described. FIG. 7 is a side cross-sectional view showing a vacuum cleaner to which the noise reduction device 30 according to Embodiment 3 is applied. The difference between Embodiment 3 and Embodiment 1 shown in FIG. 1 is that the noise reduction plate 11 surrounds the motor 5 and is arranged in a box shape; the sound-to-heat conversion hole 12 formed on the noise reduction plate 11 is bottomed. Holes; outside the noise reduction plate 11, a sponge-like vibration-absorbing layer 31 is provided. The other configurations are the same or equivalent to Embodiment 1. In addition, the same code|symbol is attached|subjected to the same or equivalent component as Embodiment 1, and the description is abbreviate|omitted.

[0042] The noise reduction device 30 of the present embodiment surrounds the motor 5 with five noise reduction plates 11 arranged around the motor 5 (upper, lower, left, right, and rear). Ther...

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Abstract

A conventional noise reducing device requires two filters and two resonance chambers, resulting in the device becoming large-sized and complicated. Therefore, there has been a problem that the device is difficult to incorporate into a home electric appliance. The noise reducing device of the invention comprises a noise reducing plate (11) disposed in the vicinity of a noise source (5) and opposed to the latter, and a plurality of sound-heat transducing holes (12) formed in the noise reducing plate (11) for transducing sound energy into heat energy, each sound-heat transducing hole (12) comprising a contraction chamber (13) disposed on the side of the noise source (5) and having a first hole width, and an expansion chamber (14) disposed on the side opposite to the noise source (5) side and having a second hole width greater than the first hole width; therefore, the device is simple in arrangement, and reduction in size and weight of the device is realized. As a result, incorporation into a home electric appliance, such as a sweeper, becomes easier, and it becomes possible to provide a superior, almost noiseless home electric appliance at low cost.

Description

technical field [0001] The present invention relates to a noise reduction device for reducing the output sound pressure level of noise. technical background [0002] As a conventional noise reduction device, for example, a device described in JP-A-7-334163 is known. In this conventional noise reduction device, behind the motor as the noise source, the first and second filters are arranged at intervals, and the first resonance chamber is formed between the motor and the first filter, and the first resonance chamber is formed. 2nd resonance chamber between 1st filter and 2nd filter. In this way, the noise generated from the motor can be reduced by the first and second resonance chambers and the first and second filters. [0003] However, since the conventional noise reducing device requires two filters and two resonance chambers, the shape of the device is large and complicated. Therefore, there is a problem that it is difficult to assemble into a home electric appliance. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/16F01N1/00A47L9/00G01K11/16G10K11/172
CPCA47L9/0081G10K11/04G10K11/16
Inventor 藤原奖岩原明广户井武司柏木隆宏
Owner MITSUBISHI ELECTRIC CORP
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