JP2008144996A - Silencer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silencer having sound insulating properties while securing air permeability, in the silencer for reducing noise wave transmitted from a noise source at one side of a louver structure constituting a wall, to the other side. <P>SOLUTION: In this silencer of the louver structure provided with ventilation passages 5 formed in multiple stages, bent blade bodies 4 are respectively disposed between the ventilation passages, and silencing chambers 7 are defined inside of the blade bodies. Plate members 9 are disposed on surface positions of the blade bodies with which the noise wave moving in the ventilation passages collides, thus the noise wave is guided into the silencing chambers 7 by the plate members 9 and a sound pressure of the noise can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gallery structure provided on a wall surface of a building structure, and in particular from a noise source on one side of the gallery structure through an air passage formed between a plurality of blade bodies constituting the gallery structure. It is related with the silencer which reduces the noise sound wave transmitted to the side.

  Conventionally, a noise barrier is well known as one of means for preventing noise generated from automobiles, construction sites, and other noise sources. Walls made of translucent resin plates and metal members are installed on the side of the road and around the construction site so that noise generated on one side of the wall is not directly transmitted to the other side. It is said that the sound insulation effect increases as the height increases, and the height tends to increase more and more.

  By the way, in addition to the above types of noise sources, there are those that are fixedly installed in association with building structures such as industrial machines and air conditioner outdoor units, and many such noise sources are ventilated to the outside air. It is necessary to ensure heat and ventilation and to dissipate the heat generated by the operation of the mechanical device that is the noise source. If soundproofing is given top priority, it is desirable to install a wall that completely blocks the side with and without the noise source, but the problem of heat dissipation cannot be ignored. The covering soundproof wall has a galley structure so that both sound insulation effect and air permeability can be obtained.

For example, in Patent Document 1 below, the interior of a hollow door body is divided by a separator to form a duct, and a sound absorbing material is attached to the inner surface of the duct, and a louver is attached to each of the door surface and the back surface of the duct end. A louver door is disclosed. According to this prior example, the noise that has entered from one of the doors of the door is sound-insulated by the duct, and is further absorbed by the sound-absorbing material in the duct, so that it is possible to mute the door while providing the door.
JP-A-8-28153

  According to the preceding example, it is possible to mute the door from one side to the other side while ensuring air permeability. However, since the duct itself formed inside the door body is used as a silencing space and a louver is attached to the end of the duct, it does not vent the entire door, but vents it through the louver provided in a part of the door. In terms of ventilation efficiency, it was not excellent. In addition, there is a risk that the heat radiation cannot catch up in applications where the heat generated by the mechanical device is radiated.

  The present invention was made in response to the problems of the preceding examples, and in a silencer for reducing noise sound waves transmitted from a noise source on one side of a gallery structure constituting a wall to the other side, The problem is whether it is possible to provide a silencer with sound insulation while ensuring good air permeability.

  In order to solve the above-mentioned problems, the present invention is a gallery structure in which air passages for ventilating inside and outside a building are arranged in multiple stages, and the sound pressure of noise sound waves passing through the air passages is reduced. In the louvered silencer, a plurality of first ventilation openings formed at one opening end of the ventilation path, a second ventilation opening formed at the other opening end of the ventilation path, and a plurality of stages. A blade body that is provided between the air passages and separates the adjacent air passages, a sound-absorbing chamber that houses a sound absorbing material in a predetermined volume of space formed inside the blade body, and faces the air passage A plate-like member that is provided on the surface of the blade body and guides a noise sound wave entering from the first ventilation port to the inside of the muffler chamber while forming a part of the air passage, and the blade body is bent. Forming the bent air passage into a bent shape and Approach to propose a muffler, characterized in that providing the plate-like member on the surface position of the sail body against the noise sound waves traveling air passage.

According to the present invention, in a louvered silencer in which air passages are arranged in a multi-stage manner, a bent blade body is provided between the air passage and the air passage, and a sound deadening chamber is formed inside the blade body. Yes. Then, a plate-like member is attached to the surface position of the blade body where the noise sound wave traveling through the air passage collides, and the noise sound wave is guided to the inside of the silencer chamber by the plate-like member. Such a structure eliminates the need for the silencing function of the air passage itself, and the air passage is used exclusively as an air passage, and noise sound waves that enter along with fresh air during ventilation are separated from the air passage. The sound can be silenced by guiding it to the muffler room. Therefore, the length of the air passage can be shortened, and the air passage and the sound deadening chamber can be laminated in a multistage manner over the entire wall surface, so that excellent air permeability can be obtained while providing sound insulation.
Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory view showing the appearance of a silencer according to an embodiment of the present invention. Reference numeral 1 denotes a silencer of the present invention having a so-called louver structure. Reference numeral 2 denotes a ventilation opening, which is provided in a plurality of stages in the vertical direction with respect to both side surfaces 3 a and 3 b of the main casing 3. The noise side vent 2a (first vent described in the claims) appears on the front side of FIG. 1, and when the silencer is installed, the noise side vent 2a is present as a noise source. Install it facing the side. Although not appearing in FIG. 1, a quiet side ventilation port 2 b (second ventilation port described in claims) is similarly opened on one side surface 3 b of the main body casing.

  Next, the cross-sectional structure of the present invention will be described with reference to FIG. FIG. 2 is an explanatory view showing a cross section of one stage of the ventilation opening 2. Reference numeral 4 denotes a blade body that forms a ventilation path 5 that separates the ventilation opening adjacent to the upper stage or the lower stage and communicates from the noise-side ventilation opening 2a to the silent-side ventilation opening 2b. As shown in the figure, the blade body 4 has a bent shape having a plurality of inclined portions 4-1, 4-2, 4-3, and the noise side ventilation opening 2a located below the blade body 4. On the other hand, the 1st inclination part 4-1 and the 3rd inclination part 4-3 in which the slope which faces the ventilation path 5 faces the noise side ventilation hole 2a side, and the 2nd inclination part which faces the noise side ventilation hole 2b side It has a zigzag shape that is continuously connected to 4-2. A plurality of blade bodies 4 attached in the vertical direction of the apparatus 1 are uniformly provided with the above-described shape. As a result, the air passage 5 formed by being sandwiched by the two blade bodies 4 is also bent portions 5-1, 5. -2 has a zigzag cross-sectional shape.

  A continuous hollow space is formed inside the first inclined portion 4-1 to the third inclined portion 4-3 constituting the blade body 4, and a fibrous material such as glass wool, urethane or the like is formed in the hollow space. The sound-absorbing material 6 made of a porous material is accommodated to form a sound deadening chamber 7. And the sound wave introduction port 8 is provided in the surface which comprises the lower side of the 1st inclination part 4-1 and the 3rd inclination part 4-3, and faces the noise side ventilation port 2a located in the lower side. The sound deadening chamber 7 and the air passage 5 are communicated with each other through the sound wave introduction port 8. The sound wave introduction port 8 is provided with a sound wave reflection plate (a plate-like member described in the claims) 9 and enters the air passage from the noise side air passage 2 a while constituting a part of the air passage 5. Noise sound waves are reflected toward the inside of the muffler chamber 7. The sound wave reflecting plate 9 is formed in a curved surface shape so that its cross-sectional shape draws an elliptic curve. By adjusting to f2), the noise sound wave that has entered from the noise side vent 2a and reflected by the sound wave reflection plate 6 is guided to the inside of the silencer chamber 7. By the way, the surface constituting the upper side of the second inclined portion 4-2 and facing the noise side ventilation port 2a located on the upper side is formed by the punching plate 10 provided with a large number of holes. The sound deadening chamber 7 and the air passage 5 are communicated with each other through the punching plate 10. Therefore, the noise sound wave entering from the noise side vent 2a collides with the surface of the punching plate 10 and a new sound source is generated at the hole by the Huygens principle. Noise energy is reduced by entering the interior.

  Here, the cross-sectional shape of the sound wave reflection plate 9 will be described. In the present embodiment, an elliptical shape is given as the cross-sectional shape of the sound wave reflecting plate 9, but as shown in FIG. 3, a continuous elliptic curve formed into a flat elliptical shape by using a mold or the like (see FIG. )), An approximate elliptic curve (FIG. 3B) formed by finely bending a flat plate by a sheet metal working machine may be adopted. In the case of a continuous elliptic curve, the range of the focal points f1 and f2 is accurate in a narrower range, and in the case of a pseudo elliptic curve, the range of the focal points f1 and f2 is slightly widened and the contour thereof is increased. However, the difference between the two is sufficiently acceptable to obtain the silencing effect of the present apparatus. Needless to say, it is not necessary to limit to an elliptical shape. For example, it is possible to adopt a curve such as a circle, a parabola, or a hyperbola. In this case, the center point of each curve or the position of the focal point may be set near f2 shown in FIG. Furthermore, the cross-sectional shape of the sound wave reflection plate 9 may be a shape obtained by bending a flat plate at several places instead of a curved line. For example, a flat plate can be bent at one location to have a substantially “<”-shaped cross section. In that case, since the sound wave reflection plate 9 does not have a focal point, the efficiency of attracting noise sound waves into the muffler chamber is reduced, but a relatively free design can be performed.

  Next, the operation of the embodiment of the present invention will be described. When a noise sound wave that has arrived from an external noise source (not shown) enters the air passage 5 from the noise side vent 2a, the noise sound wave that has entered first is a sound wave provided in the first inclined portion 4-1 shown in FIG. The light hits the reflection plate 9 and is reflected toward the inside of the sound deadening chamber 7 to be introduced into the sound deadening chamber. At this time, the reflected noise sound wave collides with the edge portion of the sound wave reflection plate 9 or the edge portion of the sound wave introduction port 8 to generate a new sound source or a diffraction phenomenon due to Huygens' principle. For example, the traveling direction of the sound wave is disturbed and is introduced into the muffler chamber. The noise sound wave that has entered the sound deadening chamber 7 is reflected irregularly in the sound deadening chamber so that reflected waves out of phase meet each other to cancel energy, or the sound absorbing material 6 reduces the energy of the sound wave. As a result, the energy of the noise sound wave is greatly reduced, and a silencing effect is obtained.

  The noise sound wave that passes through the sound wave inlet 8 of the first inclined part 4-1 and travels through the air passage 5 is the second inclined part 4-4 of the blade body located on the lower side at the bent part 5-1. 2 collides with the punching plate 10 and a part of the noise sound wave enters the muffler chamber in the lower blade body to reduce the noise energy. At this time, the noise sound wave that has passed through the punching plate 10 without entering the silencing chamber travels through the ventilation path 5 toward the silent side ventilation opening 2b, and the third inclined portion 4- at the bent portion 5-2. 3 hits the sound wave reflecting plate 9 provided on the head 3 and is reflected toward the inside of the sound deadening chamber 7 to be introduced into the sound deadening chamber. The noise sound wave that has entered the sound deadening chamber is attenuated in the same manner as described above, thereby providing a sound deadening effect. Then, the ventilation air from which the noise energy of the noise sound wave has been removed is supplied from the silent side vent 2 b to the side surface 3 b side of the main casing 3.

  The present invention is configured as described above, but is not limited to the above embodiments. For example, although the punching plate 10 is attached to the second inclined portion 4-2 in the above embodiment, a sound wave reflection plate may be attached by providing a sound wave introduction port in the same manner as the first inclined portion or the third inclined portion. Good.

It is explanatory drawing which shows the external appearance of the silencer in connection with the Example of this invention. It is a section explanatory view showing the important section structure of the silencer concerning the example of the present invention. It is explanatory drawing about the curve shape given to the sound wave reflection board 9 of this invention Example.

Explanation of symbols

1 Silencer Main Body 2 Ventilation Port 2a Noise Side Ventilation Port (First Ventilation Port)
2b Silent side vent (second vent)
DESCRIPTION OF SYMBOLS 3 Main body casing 3a One side surface of main body casing 3b One side surface of main body casing 4 Blade body 4-1 1st inclination part 4-2 2nd inclination part 4-3 3rd inclination part 5 Air flow path 6 Sound absorbing material 7 Silencer room 8 Sound wave Inlet 9 Sound wave reflector 10 Punching plate

Claims (1)

In the louver structure in which the air passages for ventilating the inside and outside of the building are arranged in a multi-stage shape, and the silencer of the louver structure that reduces the sound pressure of the noise sound wave passing through the air passages,
A first ventilation opening formed at one opening end of the air passage;
A second ventilation opening formed at the other opening end of the air passage;
A blade body provided between the plurality of air passages arranged in a multi-stage shape, and separating adjacent air passages;
A sound deadening chamber containing a sound absorbing material in a space of a predetermined volume formed inside the blade body;
A plate-like member that is provided on the surface of the blade body facing the air passage, and that guides the noise sound wave that enters from the first air vent while forming a part of the air passage, to the inside of the muffler chamber;
The blade member is formed in a bent shape so that the air passage is bent, and the plate-like member is placed on the surface position of the blade body against noise sound waves that enter from the first ventilation port and travel through the air passage. A silencer characterized by being provided.

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