JPH06323123A - Funnel with built-in silencer - Google Patents

Abstract

PURPOSE:To improve silencing effect with certain sound ranges only combined by providing a sound absorbing material silencer on the bottom of a funnel mainframe and a tapered and upward-opened sound absorbing element inside the casing of the silencer. CONSTITUTION:A silencer 11 is provided on the bottom of a funnel mainframe 16. The silencer 11, wholly made of sound absorbing material 12, has a gas inlet 14 on the side face of the casing 13 of the silencer. A sound absorbing element 15 is provide above the gas inlet 14 inside the casing 13. The sound absorbing element 15, tapered and upward-opened, is formed of sound absorbing material 12. In the silencer, noise from the gas inlet 14 is first absorbed by the sound absorbing material 12 for the casing 13. Then, noise rising in the casing 13 is propagated while being reflected from the outside face of the tapered sound absorbing element 15 and the inside face of the casing 13 and silenced and absorbed by the tapered sound absorbing element 15. At this time, silencing effect can be improved with certain sound ranges only combined by the up and down movement of the tapered sound absorbing element 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chimney having a silencer for a refuse incinerator, for example.

[0002]

2. Description of the Related Art FIG. 2 is a schematic sectional view of a conventional chimney for a refuse incinerator. In the figure, reference numeral 1 is a muffler provided at the bottom of the chimney, and this muffler 1 is entirely made of a sound absorbing material 2 and has a gas inlet 4 on a side surface of a casing 3 of the main body of the device. A cylindrical sound absorber 5 is provided above the gas inlet 4 in the inside 3. Further, a chimney body 6 made of a heat insulating material is erected on the upper part of the muffler 1.

The conventional chimney with a built-in silencer is as follows.
Since the casing 3 and the cylindrical sound absorber 5 are made of a sound absorbing material, the noise from the gas inlet 4 is absorbed by these sound absorbing materials 2 and the sound is reduced. Furthermore, the sound absorbing body 5 inside the casing 3 silences the sound that spreads inside the casing 3.

[0004]

However, the above-mentioned conventional chimney with a built-in silencer has a problem that the soundproofing effect is insufficient and, moreover, the muffling effect is difficult to be enhanced for noise in a certain sound range.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide a chimney with a built-in silencer which is more excellent in silencing effect than before.

[0006]

A chimney with a built-in muffler of the present invention is provided with a muffler made of a sound absorbing material at the bottom of the chimney body, and the inside of the casing of this muffler has a tapered shape that expands upward. The feature is that a sound absorber is provided. Further, in the chimney with a built-in silencer of the present invention, a tapered sound absorber is provided so as to be vertically movable.

[0007]

With the above structure, noise is reflected by the outer surface of the tapered sound absorber and the inner surface of the casing, and is absorbed by the tapered sound absorber.

Further, by vertically moving the position of the tapered sound absorber by the actuating device, it is possible to enhance the soundproof effect by matching only the sound in a certain sound range.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a muffler-embedded chimney according to an embodiment of the present invention. This chimney is a large chimney used in an incinerator for municipal solid waste. In this FIG.
11 is a muffler, and this muffler 11 is entirely made of sound absorbing material 12 as in the conventional case, and has a gas inlet 14 on the side surface of the casing 13 of the main body of the device. The sound absorber 15 is provided at the upper position. In addition, in FIG. 1, 16 is a chimney main body.

Unlike the conventional sound absorbing body, the sound absorbing body 15 of the present invention uses a tapered sound absorbing body made of the sound absorbing material 12 and expanded upward. Moreover, the sound absorbing body 15 is suspended in the caging 13 by the support arm 17,
An actuator (not shown) is configured to move up and down with a constant width.

Next, the operation of the above configuration will be described. In this chimney, exhaust gas flows into the casing 13 from the gas inlet 14 on the side surface of the muffler 11, rises in the chimney body 16 and is released to the outside air.

In the silencer, first, the noise from the gas inlet 14 is absorbed by the sound absorbing material 12 of the casing 13. Further, the noise rises in the casing 13, propagates while being reflected by the outer side surface of the tapered sound absorbing body 15 and the inner side surface of the casing 13, and is silenced / absorbed by the tapered sound absorbing body 15.

At this time, by moving the position of the tapered sound absorbing body 15 up and down by the actuating device, it is possible to adjust the wavelength of only the sound in a certain sound range to enhance the soundproof effect. That is, in order to achieve sound insulation at high frequencies, which has been difficult in the past, by moving the position of the tapered sound absorbing body 15 up and down, it is possible to enhance the sound insulation effect of the high sound source in accordance with the high frequency.

In the above embodiment, the sound absorbing body 15 is constructed so as to move up and down. However, the present invention is not limited to the vertically moving body, and a tapered sound absorbing body is fixed in the casing 13. May be.

[0015]

As described above, according to the present invention, the sound absorbing effect having a tapered shape can enhance the sound deadening effect as compared with the conventional case. Further, by moving the tapered sound absorber up and down, it is possible to enhance the sound deadening effect by matching only the sound in a certain sound range.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a muffler-embedded chimney according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing a conventional chimney with a built-in silencer.

[Explanation of symbols]

 11 Muffler 12 Sound absorbing material 13 Casing 15 Sound absorber 16 Chimney body

Claims (2)

[Claims] 1. A sound deadening device built-in type, characterized in that a sound deadening device made of a sound absorbing material is provided at a bottom portion of a chimney body, and a tapered sound absorbing body expanding upward is provided inside a casing of the sound deadening device. chimney. 2. The chimney with a built-in silencer according to claim 1, wherein a tapered sound absorber is provided so as to be movable up and down.