JP2008121212A - Muffling louver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffling louver without generating secondary noise when a blade body casing itself of the muffling louver resonates by a noise sound wave, while providing the muffling louver having sound insulating performance while securing ventilation performance, in the muffling louver for reducing the noise sound wave transmitted to the other from a noise source existing in one of a wall body via an air vent of an out-fitted louver. <P>SOLUTION: This louver is provided by slantingly installing a blade body in the air vent formed on a wall surface. A muffling chamber is arranged inside the blade body. This muffling chamber is divided into a plurality by a partition wall. A muffling chamber opening is formed in a position opposed to the air vent of the wall surface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an exterior louver provided on the wall of a structure such as a house, office, factory, etc., and particularly reduces noise sound waves transmitted from a noise source on one side of a wall body to the other through a vent of the exterior louver. It is about a silencer louver.

  Conventionally, a noise barrier is 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 of such noise sources are breathable and ventilated to the outside air. Therefore, it is necessary to dissipate the heat generated with the operation of the mechanical device that is a noise source. If the highest priority is placed on soundproofing, it is desirable to use a wall that completely separates the side with and without the noise source, but the point of heat dissipation cannot be ignored. A soundproof wall body is provided with a vent hole, and an exterior louver with a blind blade attached obliquely to the vent hole is employed to combine both sound insulation and ventilation.

  For example, in Patent Document 1 below, a plurality of blades arranged in the horizontal direction are provided in the communication openings such as wall surfaces, doors, and ducts in the vertical direction, and the blades are inclined with respect to the air flow to form a horizontal through passage. In the louvers arranged at predetermined intervals so as not to occur, there is disclosed a louver provided with a sound insulation plate that is opened by wind pressure at the inlet or outlet of a ventilation path formed between blades. According to this preceding example, in a state where there is no wind flow, the sound insulation plate is closed to prevent the noise in the building from leaking outside through the ventilation path, and when wind flow occurs, the sound insulation plate is caused by wind pressure. Is open to allow outside air to pass through.

  That is, in Patent Document 1, since the sound insulating plate is closed when there is no wind flow, it is possible to prevent the noise in the building from leaking outside. However, when a wind flow occurs, the sound insulation plate is opened by the wind pressure and the outside air is taken into the building, so that the sound insulation cannot be maintained and the noise inside the building leaks out. There is.

  Accordingly, the present applicant has already proposed Japanese Patent Application No. 2006-199639 to deal with such problems. According to the proposal, a sound deadening chamber is provided inside the louver blade body, and two types of reflectors are provided at the opening of the sound deadening chamber to form a noise sound wave coming directly from the noise source and an opening. A noise sound wave that enters as a diffracted wave after hitting a member or the like can be captured by these two types of reflectors and guided into the muffler chamber. The noise sound waves introduced into the muffler chamber are repeatedly irregularly reflected inside, so that waves with opposite phases collide with each other and cancel each other, and the sound pressure of the noise is reduced as a whole.

However, as a result of repeated efforts, it was found that the above proposal still has problems. In the proposal of Japanese Patent Application No. 2006-199639, the noise sound wave that has arrived from the noise source can be efficiently introduced into the silencer chamber by the action of two kinds of reflectors. As a result, a resonance phenomenon occurs in the casing, and the entire casing behaves like a speaker, generating secondary noise.
JP-A-60-223587

  The present invention has been made in response to the above-described problems, and in the silencing louver that reduces the noise sound wave transmitted from the noise source on one side of the wall body to the other through the vent of the exterior louver, the air permeability is ensured. In addition to providing a silencing louver with sound insulation at the same time, it is possible to provide a silencing louver in which the blade casing of the silencing louver itself does not resonate due to noise sound waves to generate secondary noise. Is an issue.

  In order to solve the above-described problems, the present invention attaches a blade body inclined in a hook shape along the edge of a vent formed on a wall surface or the like, and reduces the sound pressure of noise sound waves radiated through the vent. In the silencing louver, the blade body includes a main body casing having a space of a predetermined volume therein, a silencing chamber containing a fibrous material such as glass wool and a porous material such as urethane inside the main body casing, A partition wall that divides the silencing chamber into a plurality of spaces, and a silencing chamber opening that is formed on one surface of the main body casing that faces the vent, and noise sound waves radiated through the vent from the silencing chamber opening of the blade body The present invention proposes a silencing louver that is introduced into a silencing chamber and is repeatedly reflected in the silencing chamber divided into a plurality of portions by the partition wall to reduce the sound pressure.

  The proposed silencing louver is composed of a plate-shaped member having a curved surface, and is composed of a first reflecting plate attached in the direction from the opening edge of the silencing chamber opening toward the silencing chamber, and a planar member having a planar shape. A second reflector that faces the curved surface of the first reflector and is attached in the direction toward the interior of the silencer chamber from the opening edge of the silencer opening, and that the sound wave emitted through the vent is transmitted through the silencer. It is desirable to introduce into the silencer chamber via the first reflector and the second reflector attached to the chamber opening.

  Further, it is desirable that the surface of the partition wall be provided in parallel to the opening surface of the silencer chamber opening.

  According to the present invention, in a louver in which a blade body is inclined and attached to a vent hole formed on a wall surface or the like, a sound deadening chamber is provided inside the blade body and the sound deadening chamber is divided into a plurality of partitions by the partition wall, A silencing chamber opening is formed on the surface facing the mouth. Noise sound waves that arrive from the noise source and jump from the vents enter the silencer chamber through the silencer opening and are repeatedly reflected in the silencer chamber to reduce the sound pressure of the noise. Since the interior of the room is divided into a plurality of partitions, resonance of the blade casing due to noise sound waves can be suppressed. Since the space in the muffler room is divided into a plurality of spaces, even if resonance occurs in the casing due to noise sound waves, the resonance can be dispersed in each divided space, resulting in significant generation of secondary noise. It becomes possible to reduce.

  In addition, since the first reflecting plate having a curved surface shape and the second reflecting plate having a planar shape are attached to the opening of the silencer chamber, noise sound waves that jump into the side on which the blades are attached through the vents, It can be caught at the silencer opening of the wing. In particular, a direct wave of noise sound waves radiated from the vent is reflected by the first reflector into the noise reduction chamber, and noise sound waves that diffract after being radiated from the vent and hitting the opening of the blade body are generated. Since the sound is guided along the surface of the reflection plate 2 into the sound deadening chamber, noise sound waves can be captured efficiently and a high sound deadening effect can be obtained.

In addition, since the partition wall is installed in the silencer chamber so that the surface thereof is parallel to the opening surface of the silencer chamber, the silencer space is independent of the traveling direction of the noise sound wave entering the silencer chamber from the silencer chamber opening. A plurality of layers can be stacked. As a result, noise sound waves that have entered the muffler are first reduced in the muffler space formed on the near side of the muffler chamber opening, and then enter the muffler space on the far side away from the muffler chamber opening. Therefore, the sound pressure is reduced. At that time, even if secondary noise is generated due to resonance in the previous noise reduction space, the entire blade body resonates to generate secondary noise in order to mute the noise in the noise reduction space located on the back side. Can be prevented.
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 silencing louver according to an embodiment of the present invention. The silencing louver 1 of the present invention includes a frame body 2 (wall surface), a plurality of ventilation holes 3 provided in the frame body 2, and a blade body 4 attached obliquely with the tip down so as to cover each ventilation hole 3. And.

  The main structure of the silencer louver configured as described above will be described with reference to the cross-sectional explanatory view of FIG. As shown in FIG. 2, a blade body 4 that covers the vent hole 3 from an upper position of the vent hole 3 toward an obliquely lower side is fixed to one side of the frame body 2 provided with the vent hole 3. While being blindfolded so that the other side cannot be seen through one side of the body 2 through the vent, the air permeability is ensured.

  Next, the structure of the blade body 4 will be described. Reference numeral 5 denotes a blade casing (main body casing), which has a hollow housing structure made of a metal plate member. Reference numeral 6 denotes a fixed bracket, which is fixed to the frame body 2 with bolts 7 and nuts 8 and has a mounting hole 9 in the rib while forming a rib perpendicular to the mounting surface to the frame body 2. An attachment hole corresponding to the attachment hole 9 of the fixed bracket 6 is formed in the blade casing 5, and the blade casing 5 is fixed to the fixed bracket 6 by tightening the screws 10 with the respective attachment holes being aligned. I try to keep it. Reference numeral 11 denotes a silencing chamber opening provided in the blade casing 5, which is formed in a positional relationship facing the vent 3 of the frame body 2 with the blade casing 5 attached to the fixed bracket 6. The inner space of the blade casing 5 faces the outside of the casing. The inner space of the blade casing 5 is filled with a sound absorbing material 12 made of a fibrous material such as glass wool or rock wool, or a porous material such as urethane to form a sound deadening chamber. The structure is designed to reduce the noise energy of the sound wave by introducing the sound wave that enters through the sound deadening chamber.

  Here, this embodiment is characterized in that the interior of the muffler chamber is divided into a plurality of parts. A specific structure will be described. A stay 13 having a fixed height reaching the approximate center of the depth dimension of the sound deadening chamber is attached to the inner wall surface of the blade casing 5 by spot welding or the like. The partition wall 14 is fixed by screws 15. The partition wall 14 is fixed so that its surface is parallel to the opening surface of the muffler chamber opening 11 (parallel to the edge of the opening), and at the same time, against the inner wall surface of the blade casing 5 to which the stay 13 is attached. Parallel positional relationship. In FIG. 2, the partition wall 14 divides the silencer chamber from one end to the other end in the silencer chamber with respect to the height direction of the silencer chamber perpendicular to the direction in which the stay 13 rises. As a result, the first silencing chamber 16-1 is formed on the side close to the silencing chamber opening 11, and the second silencing chamber 16-2 is formed on the far side with the partition wall 14 therebetween.

  Next, the structure around the muffler chamber opening 11 will be described in detail. As shown in the drawing, a plurality of plate-like members are attached to the silencer chamber opening 11 from the edge portion of the opening toward the first silencer chamber 16-1 side. First, the reflecting plate 17 is a first reflecting plate made of a curved plate. The reflection plate 17 reflects the noise sound wave that directly reaches from the external noise source through the vent hole 3 toward the sound wave introduction port 19 that is the entrance of the first sound deadening chamber 16-1, thereby making the first sound deadening chamber. It leads to the inside of 16-1. Next, a sound wave introducing plate 18 as a second reflecting plate constituted by a planar plate material. The sound wave introduction plate 18 diffracts the noise sound wave entering through the vent 3 at the diffraction edge 18a of the sound wave introduction plate 18, and directly follows the surface of the sound wave introduction plate 18 from the sound wave introduction port 19 to the first silencing chamber. It leads to the inside of 16-1. Further, the sound wave that could not be captured by the diffraction phenomenon at the diffraction edge 18a is reflected by the reflecting plate 17 and guided to the inside of the first silencing chamber 16-1. The reflection plates 17 and the sound wave introduction plates 18 are alternately arranged and secured while securing the sound wave introduction ports 19.

  By the way, the reflecting plate 17 is formed in a curved surface shape so that the cross-sectional shape draws an elliptic curve, the first focal position of the elliptical shape is made coincident with the position of the diffraction edge 18a, and the second focal position is set as a sound wave. It matches with the position of the inlet 19. With such a positional relationship, the sound wave that is not captured by the diffraction edge 18a but travels away from the surface of the sound wave introduction plate 18 is effectively reflected toward the sound wave introduction port 19, and the first silencing chamber 16 is reflected. -1 can be introduced inside.

  Next, the operation of the silencing louver according to the embodiment of the present invention will be described. When the noise sound wave that has arrived from the noise source passes through the vent 3 and reaches the muffler chamber opening 11, as already described, a part of the reached sound wave causes a diffraction phenomenon with the diffraction edge 18a as a diffraction point, and the sound wave is introduced. It travels along the surface of the plate 18 and enters the inside of the first silencer chamber 16-1 from the sound wave inlet 19. Further, the noise sound wave that directly hits the reflection plate 17 is reflected toward the sound wave inlet 19 and enters the inside of the first silencing chamber 16-1. Thus, the noise sound wave introduced into the inside of the first silencing chamber 16-1 on the side close to the silencing chamber opening 11 repeats irregular reflection in the silencing chamber filled with the sound absorbing material 12, thereby causing reflected waves having different phases to each other. As a result of the collision, the energy of the sound wave is reduced by the action of the sound absorbing material 12 due to the mutual cancellation of the energy of each other. When the noise sound wave introduced into the first silencing chamber 16-1 has a large energy, the casing 5 and the partition wall 14 surrounding the silencing chamber may resonate with the sound wave energy. The vibration due to the resonance at that time is concentrated on the partition wall 14 originally attached in a state of being floated at an intermediate position in one space, and the secondary noise generated by the vibration of the partition wall 14 is separated from the partition wall 14. The sound is transmitted to the inside of the existing second silencing chamber 16-2. The noise transmitted to the inside of the second silencing chamber 16-2 repeats irregular reflection in the same manner as in the first silencing chamber, cancels energy between reflected waves, and silences secondary noise.

  Although the present invention is configured as described above, the present invention is not limited to the contents of the above-described embodiments and illustrations, and various implementations are possible within the scope of the claims. For example, although the silencing chamber is divided into two by the single partition 14 in the above embodiment, the number of partition walls to be attached may be increased to further divide the chamber. Further, the partition wall 14 does not need to be a plate material that completely separates the two sound deadening chambers, and may be a punching plate in which a large number of holes are formed or a fine stitch.

It is explanatory drawing which shows the external appearance of the muffling louver concerning this invention Example. It is sectional explanatory drawing which shows the principal part structure of the silencing louver concerning this invention Example.

Explanation of symbols

1 Silencer louver body 2 Frame body (wall surface)
3 Ventilation port 4 Blade body 5 Blade body casing (Main body casing)
DESCRIPTION OF SYMBOLS 11 Silencer opening 12 Sound absorbing material 14 Partition 16-1 1st silencer 16-2 2nd silencer 17 Reflector (1st reflector)
18 Sound wave introduction plate (second reflector)
18a Diffraction edge 19 Sound wave inlet

Claims (3)

In a silencer louver that attaches a blade body that is slanted in a bowl shape along the edge of a vent formed on a wall surface or the like, and reduces the sound pressure of a noise sound wave radiated through the vent,
The blades are
A main body casing having a space of a predetermined volume inside;
A sound deadening chamber containing a fiber material such as glass wool or a porous material such as urethane inside the main body casing,
A partition that divides the silencer chamber into a plurality of spaces;
A muffler chamber opening formed on one surface of the main body casing facing the vent,
A noise sound wave radiated through the vent is introduced into the silencer chamber from the opening of the silencer chamber of the blade body, and is repeatedly reflected in the silencer chamber divided into a plurality by the partition wall, thereby reducing sound pressure. Silence louver to do. The silencing louver according to claim 1,
A first reflecting plate made of a plate-shaped member having a curved surface shape and attached in the direction from the opening edge of the muffler chamber opening toward the muffler chamber;
A plate-like member having a planar shape, and a second reflector attached to the silencer chamber side from the opening edge of the silencer chamber so as to face the curved surface of the first reflector,
A silencing louver, wherein noise sound waves radiated through the vent are introduced into the silencing chamber through the first reflecting plate and the second reflecting plate attached to the silencing chamber opening. The silencing louver according to claim 1 or 2,
A silencing louver, wherein the surface of the partition wall is provided in parallel to the opening surface of the silencing chamber opening.

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