JP3059057B2 - Splitter type silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a splitter type silencer in which noise is reduced by passing the noise through a sound absorbing material.

[0002]

2. Description of the Related Art In a building such as a factory where a large noise is generated, a large noise leaks from an exhaust duct to the outside, causing a pollution. For this reason, a muffler is attached to the exhaust duct to muffle the sound, thereby reducing the leakage of noise to the outside. As the passive type of the silencer, a sound absorbing duct type silencer, a hollow type silencer, a resonance type silencer, an interference type silencer, etc. are known. The number of required cases is increasing, and in this case, the noise of a large fan becomes a problem. In this case, a splitter type silencer configured as a sound absorbing duct type silencer having low air resistance tends to be used. In this splitter type silencer, a plurality of sound absorbing materials are arranged inside a sound absorbing passage in parallel to the direction of air flow, and noise is eliminated by passing noise between the respective sound absorbing materials. Incidentally, the splitter type silencer has a height of 10
It is not unusual for an example to reach 10 m in width and several tens m in width.

[0003]

However, in such a conventional splitter type silencer, since the sound absorbing material has a flexible structure, the surface is finished with a punching metal (perforated iron plate) or the like. It is independent on this iron plate, but if this splitter type muffler becomes large, there is a limit to being able to stand alone with the iron plate on the surface,
A frame for supporting the sound absorbing material is required. FIGS. 3 and 4 illustrate a conventional support structure of the sound absorbing material 2 provided in the large-sized silencer 1 of the splitter type. In this case, the sound absorbing material 2 is divided into upper and lower parts, and the divided sound absorbing material 2a is divided into two parts. , 2a, a steel frame (column) 4 is provided on one side of the sound absorbing material 2a, 2a, and the sound absorbing material 2 is supported by the steel beam 3 and the steel frame 4. Is performed.

However, the steel beam 3 and the steel frame 4 are required to be large-scale with the increase in the size of the splitter type silencer, so that the effective opening area of the duct is inevitably reduced and the ventilation resistance is increased. However, there is a problem that the efficiency of the silencer is reduced.

In view of the fact that the sound-absorbing material is formed to have a somewhat large thickness, the present invention provides a splitter-type silencer with high sound-absorbing efficiency by providing a structure inside the sound-absorbing material and making the sound absorbing material self-standing. The purpose is to provide.

[0006]

According to the present invention, a plurality of sound absorbing materials are arranged in a sound absorbing passage parallel to the direction of air flow, and noise is passed between the sound absorbing materials. In the splitter-type silencer configured to muffle the sound, the sound absorbing material is provided inside and outside the sound absorbing material.
Surround the circumference with a frame, and
Embed a structure composed of pillars straddling between the sides
Te, compromising ventilation performance to have a self-supporting function in the sound absorbing material
Try to obtain silencing performance without tracing .

[0007]

According to the above construction, the splitter-type silencer of the present invention is constructed such that the outer periphery of the sound absorbing material is framed inside the sound absorbing material.
Surrounding and straddling between the upper and lower inner sides of the frame
The sound absorbing material has a self-supporting function by embedding a structure constructed by combining materials, and the sound absorbing performance is maintained without impairing the ventilation performance
Since so as to obtain a, eliminating the need for beam material and Hashirazai for supporting the sound absorbing material at the outside of the sound absorbing material. For this reason, it is possible to prevent the effective opening area of the sound absorbing passage from decreasing, to reduce the ventilation resistance, and to increase the sound deadening efficiency.

[0008]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show an embodiment of a splitter type silencer 10 according to the present invention, FIG.
FIG. 2 is a cross-sectional view.

That is, the splitter type silencer 1 of this embodiment
Reference numeral 0 denotes an air duct 12 provided with a large fan as a sound absorbing passage as shown in FIGS. 1 and 2, and a sound absorbing material 14 is arranged in the air duct 12 to constitute the splitter type silencer 10. . The sound absorbing material 14 is divided into upper and lower parts as in the conventional case, and the sound absorbing materials 14a and 1
4a are abutted up and down, and a plurality of abutting sound absorbing members 14a, 14a are arranged in parallel with the direction of air flow.

The upper and lower ends of the sound absorbing member 14 are attached to the upper and lower inner walls of the air duct 12 via steel beams 16 formed of I-shaped steel. The sound absorbing members 14a, 14a divided vertically are directly joined. It has become. The splitter type silencer 10 is configured as a large-sized silencer, and the sound absorbing material 14a is formed with a thickness of several tens cm.

In this embodiment, a structure 18 is buried inside the sound absorbing material 14a, and each sound absorbing material 14a has a self-supporting function. A thin plate frame 20 is surrounded on the outer periphery of the sound absorbing material 14a, and the column member 22 is joined across the upper and lower inner sides of the thin plate frame 20 to form the structure 18.

With the above structure, the splitter-type sound absorber 10 of the present embodiment has the structure 18 disposed inside the sound absorber 14 and the sound absorber 14 has a self-supporting function.
These sound absorbing materials 14 stand alone without providing beams and columns. Accordingly, the sound absorber 10 of the present embodiment can eliminate extra beams and columns formed outside, and can prevent the effective opening area of the air duct 12 from being reduced by these beams and columns. For this reason, since the ventilation resistance of the air duct 12 can be reduced, the noise reduction efficiency of the sound absorber 10 can be greatly increased.

[0013]

As described above, in the splitter type silencer according to the first aspect of the present invention, the outer periphery of the sound absorbing material is surrounded by the frame inside the sound absorbing material.
Combine the pillars across the top and bottom inside of the frame
Was buried structures, in <br/> this was the sound-absorbing material to have a self-supporting function to obtain a silencing performance without compromising ventilation performance, beam members and the outside of these sound absorbing material There is no need to provide a pillar, and it is possible to prevent the effective opening area of the sound absorbing passage from decreasing. Therefore, there is an excellent effect that the airflow resistance of the sound absorbing passage can be reduced and the noise reduction efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a splitter type silencer according to the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional splitter type silencer.

FIG. 4 is a cross-sectional view of a conventional splitter type silencer.

[Description of Signs] 10 Splitter type silencer 12 Air duct (sound absorbing passage) 14 Sound absorbing material 14a Split sound absorbing material 18 Structure

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hideo Fujiwara 1-41-2 Shinmachi, Nishi-ku, Osaka-shi, Osaka Inside Dainets Co., Ltd. (56) References JP-A-51-35109 (JP, A) -47307 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 55/02 F01N 1/08 E04F 17/04

Claims (1)

(57) [Claims] 1. A splitter-type silencer in which a plurality of sound absorbing materials are arranged inside a sound absorbing passage parallel to a flow direction of air and noise is passed by passing noise between these sound absorbing materials. Surround the outer periphery of this sound absorbing material with a frame inside the material.
Column material
Combine to embedded the structure configuration and the silencing performance without compromising ventilation performance to have a self-supporting function in the sound absorbing material
A splitter type silencer characterized by obtaining .