JP3492473B2 - Silence chamber - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise muffling chamber for noise generated by the operation of a blower.

[0002]

2. Description of the Related Art Equipment for blowing air through pipes is used in various technical fields. For example, in an incinerator, a blower is used to supply combustion air, and air is blown into the furnace through piping.

Even in the incinerator facility, it may be necessary to take sufficient measures against noise.
For example, it is a case where it is installed on the premises of a hospital.
In other words, when designing and constructing a furnace for medical waste incineration to be installed on the premises of a hospital, it is necessary to give sufficient consideration to noise in comparison with incinerator equipment for other uses that are not particularly restricted. .

[0004] By the way, when the noise source of the incinerator facility is sought, the main cause of noise is the noise of sucking the outside air from the suction port of the blower when the blower equipped for supplying the combustion air and cooling the exhaust gas is in operation. It turned out that it was a factor.

[0005]

There is a silencer as a device for reducing harmful sounds of machinery. A muffler is a "sound absorption type" that uses the properties of sound diffraction, reflection, absorption, etc. to prevent the propagation of sound, and uses a perforated plate in a part of the tube and fill it with a sound absorbing material. , "Resonance type" with resonance chamber, "Interference type", "Expansion type", "High range reactor wave type", etc.

However, the muffler is mainly used for the purpose of reducing the noise generated when steam, gas, etc. are discharged into the atmosphere, and most of the noise muffler has been studied for the noise generated by the suction of the outside air. The reality is not. It is not possible to effectively reduce the noise generated at the air intake of the blower by using the existing silencer.

An object of the present invention is to provide a muffling chamber that effectively reduces the noise generated at the suction port of a blower.

[0008]

[Means for Solving the Problems]
Therefore, in the silencing chamber according to the present invention,Chamber
And a ductA silencing chamber, The chamber isThe upper part is a cylinder with an open body, and its body
It is divided into upper and lower two stages at the central part,Sound absorberWhenHave
ThenThe sound absorbing side is released to the atmosphere, The cavity isSpace formed in the lower section of the chamber
Is the part that attenuates the noise generated by the blower, The sound absorbing part isIt is a section formed in the upper stage of the chamber,
It is a part that absorbs the noise attenuated in the cavity,Sound absorption
Sound absorbing material is a cylindrical body of porous tissue,
Packed in parallel and densely arranged inside,The cylinder is between the accumulation of fibers
Has a gap in This gap communicates with the inside and outside of the cylinder, The duct is attached to the body of the chamber and inside the cavity
To the space of the blower and the intake port of the blower is connected,
Blows the outside air sucked into the chamber by tumbling to a blower
Part to do Is.

[0009]

Further, the cross-sectional area of the cavity of the chamber is sufficiently larger than the cross-sectional area of the duct forming the suction port of the blower , and the vibration energy is attenuated by the difference between the two cross-sectional areas.
It is something that can be made.

[0011]

[0012]

[0013]

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the sound deadening chamber of the present invention has a sound absorbing portion 2 and a hollow portion 3 in a chamber 1. In the present embodiment, the chamber 1 is a cylinder having an open upper surface, has legs 4 on the body, and the legs 4 are fixed to the floor. The chamber 1 is divided into two parts at the center part of its body, and the upper part is the sound absorbing part 2,
It is on the upstream side, the lower part is the cavity 3, and is on the downstream side. A sound absorbing material A is stored in the sound absorbing unit 2. The sound absorbing material A is a porous cylinder, specifically, a cylinder (glass wool cylinder) 5 obtained by laminating glass wool and processing it. The glass wool tube 5 has a gap between the fibers of the glass wool,
This gap communicates with the inside and outside of the cylinder to form a porous structure.

A wire mesh 7 is held on a stay 6 in the chamber 1, and a plurality of glass wool cylinders 5 are arranged in parallel on the wire mesh 7 to densely fill the sound absorbing section 2. As the glass wool cylinder 5, a commercially available heat insulating material for piping can be used as it is. This heat insulating material has, for example, a diameter of 5
There is a long length of 0 mm, which is cut into 700 mm according to the capacity of the sound absorbing part 2 of the chamber 1 (for example, diameter 550φ x length 700 mm), and 21 sound absorbing parts in a dense arrangement as shown in FIG. 2 can be filled. A wire mesh 8 is further stretched over the upper opening of the chamber 1 and fixed to the flange 9, and the upper surface of the glass wool cylinder 5 is suppressed to hold the bundle of glass wool cylinders 5 in the chamber 1.

The cavity 3 is a space formed in the lower stage of the chamber 1. A cavity 3 is provided in the body of the chamber 1.
The duct 10 communicating with the internal space is attached to the duct 10.
An intake port 12 of the blower 11 is connected to the. The blower 11 is for supplying combustion gas when the blower pipe 13 is an incinerator facility.

In this embodiment, when the blower 11 is operated, the vibration that causes noise generated in the intake port 12 of the blower 11 when the outside air is sucked from the intake port 12 passes through the duct 10 and the chamber. Although it enters the hollow portion 3 of No. 1 and is emitted to the outside air through the sound absorbing portion 2, in the present invention, the hollow portion 3 is larger than the cross-sectional area of the duct 10.
Since the cross-sectional area of the sound absorbing part is large, the vibration energy is attenuated by the difference between the two cross-sectional areas, and then each glass wool tube 5 of the sound absorbing part 2 functions as a sound absorbing duct, and the noise damped in the cavity part 3 is further absorbed. Sound is absorbed by the glass wool tube 5 of No. 2.

The bundle of glass wool tubes 5 also functions as a "diaphragm" against noise vibrations. That is, the noise attenuated in the cavity 3 disperses and flows into each glass wool cylinder 5 or into the mutual gap of the glass wool cylinders 5, is narrowed by the reduction of the cross-sectional area, and flows out of the chamber 1. It expands and attenuates to mute the sound.

In the above embodiment, the example in which the glass wool cylinder 5 is used as the sound absorbing material has been described. However, the sound absorbing material converts the energy of the incident sound into the heat energy in the material to disappear. Therefore,
In addition to glass wool, porous materials such as rock wool and foam materials such as soft urethane foam can be used as long as they have the same effect.
Glass wool is particularly excellent in sound deadening effect, and as the glass wool tube 5, a commercially available heat insulating material for piping can be used as it is as a sound absorbing material, which is convenient.

[0020]

INDUSTRIAL APPLICABILITY As described above, the present invention divides the interior of the chamber into the hollow portion and the sound absorbing portion, introduces the noise generated by the suction of the outside air of the blower into the chamber, and attenuates it in the space of the hollow portion. Furthermore, the porous cylindrical body filled in the sound absorbing portion can absorb the noise to effectively muffle the noise.

Further, according to the present invention, the total area of all the porous cylinders filled in the sound absorbing section and the gaps between the cylinders is larger than the cross-sectional area of the duct serving as the suction port of the blower.
The blower is not overloaded.

The present invention is not limited to the silencing of the blower for supplying the combustion air of the incinerator installed in the premises of the hospital, because a chamber having a simple structure and a large silencing effect is obtained without using a special material. It has the effect that it can be widely used as a silencer for equipment in which the noise on the intake side of the blower becomes a problem.

[Brief description of drawings]

FIG. 1 is a front view of a muffling chamber showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

[Explanation of symbols]

1 chamber 2 sound absorption section 3 cavity 4 legs 5 glass wool tubes 6 stay 7,8 wire mesh 9 flange 10 ducts 11 blower 12 Intake port 13 Blower piping

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F23L 1/00 F23L 5/02

Claims (2)

(57) [Claims] 1.Has a chamber and a ductSilence m
It ’s a club, The chamber isThe upper part is a cylinder with an open body, and its body
It is divided into upper and lower two stages at the central part,Sound absorberWhenHave
ThenThe sound absorbing side is released to the atmosphere, The cavity isSpace formed in the lower section of the chamber
Is the part that attenuates the noise generated by the blower, The sound absorbing part isIt is a section formed in the upper stage of the chamber,
It is a part that absorbs the noise attenuated in the cavity,Sound absorption
Sound absorbing material is a cylindrical body of porous tissue,
Packed in parallel and densely arranged inside,The cylinder is between the accumulation of fibers
Has a gap in This gap communicates with the inside and outside of the cylinder, The duct is attached to the body of the chamber and inside the cavity
To the space of the blower and the intake port of the blower is connected,
Blows the outside air sucked into the chamber by tumbling to a blower
Part to do A sound deadening chamber characterized in that 2. The cross-sectional area of the cavity of the chamber is sufficiently larger than the cross-sectional area of the duct forming the suction port of the blower.
Ku, muffle chamber according to claim 1, characterized in <br/> to attenuate vibration energy by the difference in bisected area.