JP3687268B2 - Combustor silencer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a silencer for a combustor that reduces the combustion noise of the combustor.
[0002]
[Prior art]
In general, in a water heater using an oil combustor, combustion gas is exhausted from an exhaust port through a flue after exchanging heat in a can having a heat exchanger, and combustion noise is generated. There was a problem of being big.
Therefore, means for reducing combustion noise have been proposed.
For example, there are some that fill the exhaust wall and the peripheral wall of the flue with glass wool, but there is a problem that the glass wool fiber is scattered and adversely affects the work environment, and in order to solve this problem, it is made of sound absorbing plastic It is known that an exhaust guide is provided in an exhaust passage.
[0003]
Further, in Japanese Utility Model Publication No. 3-56030, a lower fuel injection type oil combustor is disposed downward on an upper portion of a can having a heat exchanger, and an exhaust collecting portion is disposed on a lower portion of the can. In the reverse combustion type water heater using the lower fuel injection type oil combustor in which the flue is erected alongside the can body at the upper part of the exhaust collecting part and the exhaust port is erected at the upper end of the flue, A plurality of resonance spaces are formed in the exhaust collecting portion to resonate combustion sounds in a predetermined frequency range, thereby reducing combustion sounds leaking outside.
Further, what is described in Japanese Utility Model Laid-Open No. 7-32345 is provided by stacking a plurality of annular sound absorbing materials made of a fibrous material, inserting a resonance tube into the inner hole thereof, and setting the outer surface thereof to the inner hole of the annular sound absorbing material. And the diameter of the inner hole of at least one annular sound absorbing material is made larger than that of the other to form an annular space between the inner hole of the annular sound absorbing material and the outer surface of the resonance tube. Thus, in addition to the sound absorbing action of the annular sound absorbing material, a sound deadening effect is obtained by the resonance action caused by the vibration of the resonance cylinder.
[0004]
[Problems to be solved by the invention]
However, the conventional silencer for a combustor has the following problems.
Sound absorption material such as sound-absorbing plastic has a sound-absorbing effect that is determined by the material and size of the sound-absorbing material. However, there is a problem that it is difficult to improve the sound deadening characteristics of the conventional combustor.
In addition, the material using the sound absorbing material has an excellent sound absorbing characteristic for high frequency components of noise, but has a problem that the sound absorbing characteristic for low frequency components is inferior.
Further, the one provided with the resonance chamber has a problem that the frequency band having excellent sound absorption characteristics is narrow.
[0005]
An object of the present invention is to provide a silencer for a combustor that can be provided in a conventional flue gas passage and has a high noise reduction effect.
[0006]
[Means for Solving the Problems]
Combustor silencer of the present invention in order to achieve the above object, the sound absorbing material is disposed in the peripheral wall, and having a silencer exhaust stack, the resonance hole having an exhaust passage extending vertically through the sound absorbing material A silencer device for a combustor, the resonance chamber being formed inside the sound absorbing material , extending in a vertical direction substantially parallel to the exhaust passage, and the resonance hole is in communication with the exhaust passage by extending the exhaust passage substantially parallel to the vertical direction connected to the lower end of the resonance chamber. As a result, the silencer exhaust tube can have the same dimensions as a conventional exhaust tube. Further, by providing a sound absorbing material having a high silencing effect in a high frequency band and a resonance chamber having a high silencing effect in a low frequency band, a silencing effect in a wide band can be obtained. In addition, by forming the inner wall of the resonance chamber with a perforated plate, the sound absorption efficiency can be increased with the same effect as that obtained by lining the resonance chamber with a sound absorbing material. Further, the silencer for a combustor according to the present invention includes a noise-reducing exhaust pipe having a sound-absorbing material disposed on the peripheral wall and having an exhaust passage extending vertically through the sound-absorbing material, and a resonance chamber having a resonance hole. The resonance chamber for a combustor includes a plurality of resonance chambers having different sizes as the resonance chambers , and the plurality of resonance chambers are arranged in the vertical direction outside the silencer exhaust pipe. provided, resonance holes of said plurality of resonance chamber is in communication with the exhaust passage from the plurality of resonance chambers extend in the horizontal direction. As a result, the frequency bands in which each resonance chamber exhibits a sound absorption effect are different , and a high sound absorption effect in a wide frequency band can be obtained. Further, by changing the size and number of resonance holes opened in each resonance chamber, a sound absorption effect in a wider frequency band can be obtained. Furthermore, by providing a plurality of resonance chambers on the outside of the silencer exhaust pipe, only the dimensions on the resonance chamber side are increased, but the dimensions do not change in the direction perpendicular to the resonance chamber. The resonance effect can be enhanced without greatly changing the dimensions.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
In FIG. 3, an example of a water heater to which the present invention is applied will be described.
A lower fuel injection type oil combustor 1 having a combustion fan 2 is disposed downward at the upper end of the can body 3, and a helical water pipe 4 is disposed on the can body 3.
A box-shaped exhaust collecting part 5 is provided in communication with the lower end of the can 3, and a muffled exhaust pipe 6 is erected on the upper part of the exhaust collecting part 5 along with the can body 3. An exhaust port 7 is opened.
[0008]
As shown in FIG. 4, a silencing heat insulating material 51 is disposed on the peripheral wall of the exhaust collecting portion 5, and receives unburned oil and water droplets facing the combustion gas passage of the can body 3 inside the exhaust collecting portion 5. A receiving pan 8 is provided, and a flow dividing plate having a plurality of holes is provided at the upper portion of the receiving pan 8, and an exhaust passage hole 81 is formed in the peripheral wall of the receiving pan 8. With this configuration, unburned oil and water droplets in the combustion gas can be removed and discharged.
[0009]
In FIG. 1, the silencer exhaust cylinder 6 is filled with a sound absorbing material 60, is provided so as to penetrate the sound absorbing material 60, and the exhaust whose upper and lower ends communicate with the upper exhaust port 7 and the lower exhaust collecting portion 5. A passage 61 is provided, and a resonance chamber 9 formed as a blind hole extending substantially parallel to the exhaust passage 61 is formed in the sound absorbing material 60.
The resonance chamber 9 is formed of a punching metal 11, and a resonance hole 10 communicating with the exhaust collecting portion 5 is formed at the lower end thereof.
[0010]
According to this configuration, the resonance chamber 9 is provided with the sound absorbing material 60 in the periphery and is formed of the punching metal 11. Therefore, the resonance chamber 9 has the same effect as that in which the inside of the resonance chamber 9 is lined with the sound absorbing material. Sound absorption efficiency can be increased.
Further, by providing the sound absorbing material 60 having a high silencing effect in a high frequency band and the resonance chamber 9 having a high silencing effect in a low frequency band, a silencing effect in a wide band can be obtained.
In addition, the resonance chamber 9 is formed substantially parallel to the exhaust passage 61 and has a resonance hole 10 communicating with the exhaust collecting portion 5 at the lower end, so that the silencer exhaust tube 6 is the same as a conventional exhaust tube. It can be a dimension.
[0011]
Different embodiments will be described with reference to FIG.
The muffler exhaust cylinder 6 is filled with a sound absorbing material 60 and is provided so as to penetrate the sound absorbing material 60. An exhaust passage 61 having upper and lower ends communicating with the upper exhaust port 7 and the lower exhaust collecting portion 5 is disposed. A plurality of resonance chambers 12A to 12E having different sizes in parallel with the exhaust passage 61 are disposed along the silencer exhaust tube 6 on the outside of the silencer exhaust tube 6, and are disposed in the resonance chambers 12A to 12E. Resonant holes 13A to 13E communicating with the exhaust passage 61 are opened.
[0012]
According to this configuration, the frequency bands in which each resonance chamber exhibits a sound absorption effect are different and narrow, but a plurality of resonance chambers 12A to 12E having different sizes are provided, thereby providing a wider frequency band. High sound absorption effect can be obtained. Further, by changing the size and number of resonance holes opened in each resonance chamber, a sound absorption effect in a wider frequency band can be obtained.
Furthermore, by providing a plurality of resonance chambers outside the silencer exhaust cylinder 6, only the dimensions on the resonance chamber side are increased, but the dimensions do not change in the direction perpendicular to the resonance chamber. The resonance effect can be enhanced without greatly changing the dimensions of the.
[0013]
In addition, as said Example, although only what was applied to the reverse combustion type water heater was described, the thing which has arrange | positioned the combustor below may be sufficient and it may be a gas combustor It is.
[0014]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
In a silenced exhaust cylinder having a sound absorbing material disposed on a peripheral wall and having an exhaust passage penetrating the sound absorbing material, a resonance chamber extending substantially parallel to the exhaust passage is provided in the sound absorbing material, and communicated with the exhaust passage at the lower end of the resonance chamber. By providing the resonance hole to be used, the muffled exhaust pipe can have the same dimensions as the conventional exhaust pipe.
Further, by providing a sound absorbing material having a high silencing effect in a high frequency band and a resonance chamber having a high silencing effect in a low frequency band, a silencing effect in a wide band can be obtained.
Further, by forming the inner wall of the resonance chamber with a perforated plate, the sound absorption efficiency can be increased with the same effect as that of the resonance chamber lined with a sound absorbing material.
Further, in the silenced exhaust pipe having a sound absorbing material disposed on the peripheral wall and having an exhaust passage penetrating the sound absorbing material, a plurality of resonance chambers having different sizes are provided outside the exhaust pipe, and each resonance chamber has an exhaust passage. By providing a resonance hole that communicates with each other, the frequency bands in which each resonance chamber exhibits a sound absorption effect are different and narrow, but a plurality of resonance chambers having different sizes are provided, so that a wider space is provided. A high sound absorption effect in the frequency band can be obtained.
Further, by changing the size and number of resonance holes opened in each resonance chamber, a sound absorption effect in a wider frequency band can be obtained.
[Brief description of the drawings]
1 is a cross-sectional view taken along the line II of FIG. 3 showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a different embodiment of the present invention.
FIG. 3 is a schematic configuration diagram of a water heater to which the present invention is applied.
FIG. 4 is an enlarged view of a main part of a water heater to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower fuel injection type oil combustor, 2 Combustion fan, 3 Can body, 4 Water pipe 5 Exhaust collecting part, 6 Silencer exhaust pipe, 7 Exhaust port, 8 Sound absorption material, 9 Resonance chamber 10 Resonance hole, 11 Punching metal

Claims (3)

A silencer for a combustor, comprising: a sound-absorbing exhaust pipe having a sound-absorbing material disposed on a peripheral wall and having an exhaust passage extending vertically through the sound-absorbing material; and a resonance chamber having a resonance hole. ,
The resonance chamber is formed inside the sound-absorbing material and is formed to extend in the vertical direction substantially parallel to the exhaust passage, and the resonance hole is connected to the lower end of the resonance chamber and the exhaust passage. and characterized in that it communicates with the exhaust passage by which extends substantially vertically parallel to, combustor silencer. The inner wall of the resonance chamber is formed by a perforated plate, a combustor silencer according to claim 1. A silencer for a combustor, comprising: a sound-absorbing exhaust pipe having a sound-absorbing material disposed on a peripheral wall and having an exhaust passage extending vertically through the sound-absorbing material; and a resonance chamber having a resonance hole. ,
The resonance chambers include a plurality of resonance chambers having different sizes, and the plurality of resonance chambers are provided on the outside of the muffler exhaust pipe so as to be arranged in the vertical direction. holes, characterized in that the plurality of resonance chambers are communicated with the exhaust passage extending in a horizontal direction, a combustor silencer.

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