JP2003302095A - Sound damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airflow adjusting damper not only by attaching a sound absorbing material through an inner wall of a box constituting the airflow adjusting damper but by laminating the sound absorbing material on the outside of a blade for airflow adjustment so as to increase a surface area on which the sound absorbing material is attached, and by positively inducing and increasing diffused reflection of sound components in the sound damper with a packaging material of the sound absorbing material so as to improve a sound absorbing effect in the sound damper. <P>SOLUTION: In the airflow adjusting damper provided with the blade for airflow adjustment inside the box which can be attached in an air duct, the sound damper is characterized in that the sound absorbing material is laminated through the inner wall of the box and a sound absorbing performance is given to the blade of airflow adjustment. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in an air passage of an air conditioner such as an air conditioner to adjust the air volume at the time of air supply and exhaust, and at the same time muffle noise generated during ventilation.
The present invention relates to a sound deadening damper for absorbing sound.

[0002]

2. Description of the Related Art In an air-conditioning equipment duct such as an air conditioner, various noises that normally occur during ventilation make noise and enter the living space. Therefore, conventional equipment such as silencer, silencer chamber, silencer box, silencer elbow, etc. Is installed in the ventilation passage.

On the other hand, an air volume adjusting damper for adjusting the volume of air to be ventilated is provided between the air passages of the air conditioning equipment.
Devices such as the muffler, the muffle chamber, the muffle box, and the muffle elbow are provided as separate devices from the air volume adjustment damper.

Further, there has been proposed an invention of an air volume adjusting device with a sound deadening mechanism in which a sound absorbing material is attached to the inner surface of the air volume adjusting damper (Japanese Patent No. 2697616).

Further, the applicant of the present application has proposed an air volume control damper having an air volume control blade inside a box body which can be installed in an air flow passage, on the inner wall of the box body and the surface of the air volume control blade. A sound deadening damper characterized by having a sound absorbing material attached has been proposed (Japanese Patent Application No. 2001-60818).

[0006]

As described above, interposing a plurality of devices between the air passages increases the number of devices to be installed and causes troubles such as installation work and maintenance and inspection work. Was occurring.

In the conventional air volume adjusting device with a muffling mechanism (Japanese Patent No. 2697616), since a muffling mechanism is provided in the air volume adjusting damper, there is no need for a separate muffler, muffling chamber, muffling box, or muffling elbow.
The noise generated by the air conditioning equipment could be reduced to some extent, but it was still insufficient.

Further, the known sound deadening mechanism has a problem that the sound deadening material is only attached to the inner surface of the air volume adjusting device which is a part of the ordinary duct, and the total sound deadening volume is small.

In the sound deadening damper (Japanese Patent Application No. 2001-60818) proposed by the applicant of the present application, the sound absorbing material is attached to the inner surface of the air volume adjusting device, which is a part of a normal duct, and the air volume adjusting blades. In terms of noise reduction and noise reduction, it was far more effective than the known noise reduction mechanism, but there was room for further improvement.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided a sound absorbing section which is installed in a ventilation passage and absorbs sound by absorbing sound in not only the inner wall of the box constituting the air volume adjusting damper but also the air volume adjusting blades. Is a sound-damping damper with an increased area and improved blades so that the sound-absorbing material mounted on the inner wall of the box does not stick out to the air passage side. As a result, the ventilation cross section in the sound deadening damper is made smooth and the pressure loss is minimized, while the diffuse reflection of the sound component in the sound deadening damper is positively increased to enhance the sound deadening and sound absorbing effects in the sound deadening damper. It was.

That is, according to the present invention, in an air volume adjusting damper provided with blades for air volume adjustment inside a box body which can be inserted in a ventilation passage, a sound absorbing material is layered through an inner wall of the box body, and The sound deadening damper is characterized in that a blade for adjusting the air volume is provided with a sound absorbing property. This muffling damper can also be connected in series.

The sound absorbing property of the blade can be generated by covering the outer periphery of the blade made of a sound absorbing material with punching metal.

The blades are fixed blades fixed in the box body in parallel with the ventilation direction, and / or movable blades for rotating the air volume in the box body, and each blade has a longitudinal sectional shape. , The front end surface facing in the ventilation direction may be formed in a pointed or convex arc shape, and the rear end surface may be formed in a pointed shape or a convex arc shape. It is also possible to make it streamlined by gradually thinning it from the front end into which the wind flows.

The fixed blades are arranged in the box body as follows.
It is preferable that the movable blade is arranged in the middle of the rotation axis of the movable blade so as not to interfere with the rotation locus of the movable blade and in parallel with the wind flow direction.

As the sound absorbing material, a molded product of glass wool, rock wool or asbestos fibers, or a porous sponge can be adopted.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to an air volume adjusting damper provided with blades for air volume adjustment inside a box body which can be inserted in a ventilation passage, in which a sound absorbing material is layered through an inner wall of the box body,
A sound deadening damper in which sound absorbing properties are imparted to the inner wall of the box and the air flow rate adjusting blades by attaching a sound absorbing material to the air flow rate adjusting blades.

In this sound deadening damper, a sound absorbing material is attached so that the sound absorbing portion is provided on the inner wall of the box and almost the entire surface of the blade for adjusting the air volume, and the area of the sound absorbing material is increased. The sound component absorbs or reflects, refracts, and silences each time it reaches the inner wall of the box and the surface of the blade.

When the sound absorbing material is layered through the inner wall of the box body, for example, the sound absorbing portion of the inner wall of the box body is formed of punching metal, and the sound absorbing material is layered on the outer side thereof to cover the sound absorbing material. By doing so, the sound absorbing material will not stick out to the ventilation passage side,
It is possible to reduce noise while minimizing pressure loss in the noise damper.

Here, the ventilation passage means a ventilation passage such as a duct in an air conditioner such as an air conditioner.

As the sound absorbing material, glass wool, etc.
Various materials can be used as long as they have a sound absorbing effect. For example, fibers such as rock wool and asbestos can be used for molding, or porous sponge can be used.However, sound absorbing materials such as glass wool are exposed to a large amount of high-speed wind inside the sound deadening damper. Therefore, if the entire surface is covered with, for example, punching metal or the like to suppress it, the sound deadening material can be kept in a constant shape.

This punching metal or the like maintains the shape of the sound absorbing material by suppressing the sound absorbing material such as glass wool,
Not only to keep the sound absorbing material in a certain shape, but also to positively diffuse the sound component in the sound deadening damper and reduce the energy of the sound component each time the sound component reaches punching metal etc. It will increase

From the viewpoint that the diffused reflection of the sound component in the muffler damper is positively used and the smoothest ventilation is realized, the front end side facing in the ventilation direction has a pointed or convex arc shape. It is preferably molded. Further, the vertical cross-sectional shape of the blade can also be set so that the air flowing in the air passage does not separate around the blade and cause noise. For example, the thickness of each blade in the vertical cross-sectional shape may be gradually reduced from the front end into which the air flows to the rear end.

In the arrangement of the blades in the box body as well, when the air volume adjusting damper is viewed from the inlet side, the fixed blades move to the movable blades so that the diffused reflection of the sound component in the sound deadening damper can be positively utilized. It is preferably arranged so as to be located in the middle of the rotation axis.

If the fixed blades are arranged so as to be positioned in the middle of the rotary shafts of the movable blades, the fixed blades, as described above, even when the movable blades are fully open or fully closed,
Combined with the fact that the front end side is shaped into a pointed or convex arc shape with respect to the air flow direction and the reflection surface is formed with respect to the air flow direction, it actively induces diffuse reflection of sound components in the muffling damper. , Can be increased and the silencing effect can be enhanced. However,
It is necessary to install the fixed blade at a position where it does not interfere with the rotation trajectory of the movable blade so as not to obstruct the rotation of the movable blade.

The box body constituting the sound deadening damper can improve the sound deadening effect as the length in the air blowing direction becomes longer.

Further, the sound deadening damper is capable of finely adjusting the air volume in the duct and further enhancing the sound deadening effect by connecting a plurality of boxes in series to form two, three, ... .

[0027]

Embodiment 1 An embodiment of the present invention will be described with reference to FIGS.

In the sound deadening damper 1 of the present invention, the inner wall 2a of the box body 2 is formed by the punching metal 7, and the inner wall 2
Glass wool 6, which is a sound deadening material, is layered through a, and glass wool 6 is layered with a predetermined thickness on the outside of the fixed blades 3 and the movable blades 4, 5 for adjusting the air volume, and the outside is punched. It is composed of metal 7.

As shown in FIG. 6, the movable blade 4 has a vertical cross-sectional shape with a front end face facing the air blowing direction indicated by the arrow 8 having a convex arc shape and reflecting in the air blowing direction indicated by the arrow 8. The surface 4a is formed.

The shape of the movable blade 5 is also the same as that of the movable blade 4.

Further, the fixed blade 3 has a shape in which the vertical cross section has a convex arc shape on the front end side facing the air blowing direction shown by the arrow 8, and the reflecting surface 3a is formed in the air blowing direction shown by the arrow 8. ing.

If a glass cloth or a non-woven fabric (not shown) is interposed between the punching metal 7 and the glass wool 6, the glass wool 6 will pass from the hole 7a of the punching metal 7 to the inner wall 2a of the box 2 and the movable blades 4, 5. , Does not jump to the surface of the fixed blade 3.

As shown in FIGS. 1 and 7, the movable blades 4 and 5 are disposed between the side walls 2b of the box body 2 by the rotating shafts 9 and 10, respectively.
It is rotatably supported inside the box 2. The width W1 (FIG. 4) of the movable blades 4, 5 is half the height H (FIG. 4) inside the box body 2. Further, since the distance between the rotary shafts 9 and 10 is equal to the width W1, there is no gap between the movable blades 4 and 5 in the fully closed state as shown in FIG.

The movable blade 5 is also rotatably attached to the inside of the box body 2 by the same structure as the movable blade 4.

The movable blades 4 and 5 rotatably supported inside the box body 2 are housed in the interlocking metal fitting cover 13 (FIG. 5) attached to the outer wall of the box body 2. When a gear (not shown) that is connected by a connecting rod (not shown) and rotates the rotary shaft 9 of the movable blade 4 is operated by the operation handle 14, the movable blades 4 and 5 are simultaneously rotated.

The connecting rod is housed in the interlocking metal fitting cover 13 attached to the outer wall of the box body 2 because when the movable blades 4 and 5 are connected by the connecting rod in the box body 2, a wind noise is generated. This is to avoid this because it will cause In addition, the connecting rod and the interlocking metal fitting cover 13 are the operation handle 1
If they are attached to the side to which 4 is attached, these will not be an obstacle even when the silencer dampers 1 are installed in parallel.

As shown in FIG. 5, the fixed blade 3 is fixed between the rotary shafts 9 and 10 of the movable blades 4 and 5 when the silencer damper 1 is viewed from the inlet 2c (FIG. 1) side. It is arranged at an intermediate position, as shown in FIG. 1, so as to be located closer to the blower port 2d than the movable blades 4 and 5.

The glass wool 6 forms the four surfaces of the inner wall 2a of the box body 2 on the top side, the bottom side, and the left and right sides, respectively.
From the c side to the blower port 2d side, it is spread on the outside of the punching metal 7 having a flat plate shape. Further, the glass wool 6 covers the entire surface of the fixed blade 3 and the movable blades 4 and 5,
It is layered and covered with punching metal 7 (FIG. 6).

Since a large amount of high-speed wind passes through the inside of the box body 2, if the glass wool 6 is directly exposed to the large amount of high-speed wind, the glass wool 6 may be broken, but the glass wool 6 is punched metal. Since the entire surface is covered with 7, there is no fear that it will be kept in the same shape and will be torn.

The punching metal 7 absorbs sound from the hole 7a (FIG. 6 (b)), diffusely reflects the sound component 16 outside the hole 7a, and repeatedly reflects the sound component 16 inside the box 2. Works to

The sound deadening damper 1 thus constructed is
The flow of air and the principle of sound absorption / absorption when installed in the air duct of an air conditioning duct will be described.

The muffler damper 1 is used by being installed and fixedly connected to the air conditioning duct by the flange 18. In FIG. 12, the outside air is taken in through the outside air intake port 25, the circulating air is returned by the return 31, and the blowout chamber installed in the living space through the air conditioner body 26, the supply chamber 27, the main pipe 28, and the branch pipe 29. FIG. 13 is a conceptual diagram of a duct system blown out from 30, but as shown in the conceptual diagram shown in FIG. 12, the muffler damper 1 has a main pipe 2 instead of the volume damper in the machine room.
If it is attached to No. 8, before the noise reaches the blowout chamber 30 installed in the living space via the branch pipe 29, it is possible to exert a corresponding sound deadening effect in the machine room.

The air volume is adjusted by the operation handle 14 (FIG. 5).
Is operated to rotate the rotary shaft 9 of the movable blade 4, and to rotate the movable blade 4 and the movable blade 5 connected to the movable blade 4 by the connecting rod housed in the interlocking metal cover 13. The state is changed from the fully open state (FIG. 1) to the fully closed state (FIG. 4) as shown in FIGS. 1 to 4.
By such an operation, the function as an air volume adjusting damper is exhibited.

Next, the principle of sound deadening / sound absorption will be described.

FIG. 1 is an explanatory view showing a state in which the movable blades 4, 5 are set to 0 ° with respect to the air flow direction shown by the arrow 8 and are fully opened, and FIG. FIG. FIG. 3 is an explanatory view of a state in which the movable blades 4 and 5 are opened at 45 °, and FIG. Is.

Air is blown into the box body 2 from the inlet side 2c in the direction shown by the arrow 8, and is discharged from the air blow port 2d toward the blowout chamber 30 installed in the living space. At the same time as the blowing of air, the sound component 16 also enters.

When the sound component 16a shown in FIG. 6 (b) reaches the glass wool 6 exposed in the hole 7a of the punching metal 7, the sound component 16a is absorbed and silenced by the glass wool 6.

Further, the sound component 16b colliding with the plane other than the hole 7a of the punching metal 7 is reflected as it is.

As shown in FIGS. 1 to 4, the reflected sound component 16b reaches the inner wall 2a of the box body 2, the fixed blades 3, and the movable blades 4 and 5 one after another to absorb the sound by the glass wool 6 and punching metal 7. Repeatedly reflected by, it is effectively silenced.

The reflection by the punching metal 7 consumes the energy of the sound component 16 every time the sound component 16 reaches the punching metal 7, so that the repetition of reflection further enhances the effect of energy consumption and muffling.

By obtaining such a process, most of the sound component 16 that has entered from the inlet 2c with the blowing of air is silenced and absorbed in the silencer damper 1.

Here, the fixed blade 3 and the movable blades 4, 5
In the case where the movable blades 4 and 5 are set to 0 ° with respect to the blowing direction and are in a fully open state, for example, as shown in FIG. 1, the reflecting surfaces 3a, 4a and 5a are formed on the front end side. However, the sound component 16 can be positively reflected, the sound component 16 can be absorbed by the glass wool 6, and the energy of the sound component 16 can be consumed to mute the sound.

Furthermore, as shown in FIG.
Is 90 ° with respect to the blowing direction shown by the arrow 8, and even in the fully closed state, the reflecting surfaces 3a, 4a, 5a having an angle with respect to the blowing direction (arrow 8) The sound component 16 can be reflected.

In the sound deadening damper 1, the fixed blades and the movable blades are formed such that the front end sides thereof facing the air-blowing direction are formed in a convex arc shape and the reflection surface is formed, so that the separation of the wind around each blade. It is possible to suppress the generation of wind noise. Therefore, in combination with the reduction of wind noise, noise can be reduced as a whole.

The punching metal 7 forming the four sides of the inner wall 2a of the box body 2 on the top side, the bottom side, and the left and right sides is the inlet port 2.
Since it has a flat plate shape from the c side to the blower port 2d side, it is possible to suppress noise while minimizing the pressure loss in the noise damper.

[0056]

Second Embodiment Next, another embodiment of the present invention will be described with reference to FIG.

The sound deadening damper 32 of this embodiment is different from the sound deadening damper 1 of the first embodiment in that the fixed blades and the movable blades have vertical cross-sections whose front end faces facing each other in the blowing direction are pointed and are reflected. This is the point where the surface is formed.

That is, the muffling damper 32 of the present invention.
As shown in FIG. 8A, the inner wall 2a of the box body 2 is formed of punching metal 7, glass wool 6 as a sound deadening material is layered through the inner wall 2a, and fixed blades for adjusting the air volume. The glass wool 6 is layered on the outer sides of the movable blades 34 and 35 and 33 and has a predetermined thickness, and the outside thereof is covered with a punching metal 7.

As shown in FIG. 8 (b), the movable blade 4 has a vertical cross-sectional shape in which the front end face facing the air blowing direction shown by the arrow 8 is pointed, and the movable blade 4 has the shape in the air blowing direction shown by the arrow 8. On the other hand, reflective surfaces 34a and 34b are formed. The angle formed by the reflecting surfaces 34a and 34b can be variously changed in accordance with the conditions of the installation place or the like to have an optimum shape for silencing. The shape of the movable blade 5 is also the same as that of the movable blade 4.

Further, the fixed blade 33 has a vertical cross-sectional shape in which the front end face facing the air blowing direction shown by the arrow 8 is pointed, and the reflecting surfaces 33a, 33b with respect to the air blowing direction shown by the arrow 8 are formed. Are formed.

[0061]

Third Embodiment Next, still another embodiment of the present invention will be described with reference to FIG.

The difference of this embodiment from the sound deadening damper of the first embodiment is that instead of the movable blade 4 in FIG. 1, a movable blade 36 whose longitudinal cross-sectional shape is gradually thinned from the front end to the rear end is attached. It is a point. Further, the vertical cross-sectional shape of the fixed blade 3 in FIG. 1 can also be a shape that gradually becomes thinner from the front end toward the rear end. The configuration other than these fixed blades and movable blades is the same as that of the sound deadening damper 1 according to the first embodiment, and thus the description thereof is omitted.

By gradually thinning the vertical cross-sectional shapes of the fixed blades and the movable blades 36 from the front end to the rear end, the separation of wind around each blade is suppressed, and the generation of wind noise around each blade is reduced. You can Here, the rate at which the vertical cross-sectional shape gradually becomes thinner from the front end to the rear end can be determined in consideration of the wind speed in the sound deadening damper, reduction of wind noise around the blades, and reduction of pressure loss.

[0064]

Fourth Embodiment Next, still another embodiment of the present invention is shown in FIG.
Will be described.

The sound deadening damper 17 of the present invention is a sound deadening material in which two boxes 2 and 2 are connected in series, and the inner walls 2a of the boxes 2 and 2 are formed by punching metal 7, and the inner walls 2a are interposed therebetween. The glass wool 6 is layered, and the glass wool 6 is layered on the outer sides of the fixed blades 3 and the movable blades 4 and 5 for adjusting the air volume with a predetermined thickness, and the outside thereof is covered with a punching metal 7. is there.

That is, the muffling damper 17 of this embodiment.
Is a configuration in which the sound deadening damper 1 of the first embodiment is connected in series. Therefore, the fixed blade 3, the movable blade 4,
Since 5 is the same as that which constitutes the sound deadening damper 1 in the first embodiment, its explanation is omitted.

The sound deadening damper 1 is connected by bringing the fixed blades 3 into contact with each other as shown in FIG. 10 and bolting the flange 18 provided at the periphery of the mouth portion of the box body 2.

As the flange 18, the one used for interposing and fixing the muffler damper 1 of the first embodiment in the air conditioning duct is used as the box body 2,
It was used to connect the two.

In the sound deadening damper 17 of this embodiment, the air flow rate can be adjusted by two operation handles (not shown). Therefore, the air flow rate is finely adjusted as compared with the sound deadening damper 1 of the first embodiment. be able to.

Further, since the total length of the sound deadening damper 17 and the number of blades are doubled as compared with the sound deadening damper 1, the amount of the glass wool 6 absorbing the sound component 16 and the sound component 16 are reflected to consume energy. Since the area covered by the punching metal 7 can be increased, the sound component 16 can be muted more effectively.

That is, in FIG. 10, the sound component 16 is effective because the number of times it is reflected by the punching metal 7 before it passes through the inside of the sound deadening damper 17 increases and the number of times it reaches the glass wool 6 and the punching metal 7 increases. Will be muted.

[0072]

[Embodiment 5] Next, still another embodiment of the present invention will be described with reference to FIG.
Will be described.

The sound deadening damper 19 of this embodiment differs from the sound deadening damper 1 of the first embodiment in that the sound deadening damper 1 of the first embodiment includes one fixed blade 3 and two movable blades 4 and 5. On the other hand, the muffling damper 19 of this embodiment
Is two fixed blades 20 and 21 and three movable blades 2.
The point is that it has 2, 23, 24.

As for other constitutions, the fixed blades 20,
21, the movable blades 22, 23, 24 are layered with glass wool 6, which is a sound absorbing material, and the outside thereof is covered with a punching metal 7, and fixed blades 20, 21, movable blades 22, 23 , 24 and the like are the same as those of the sound deadening damper 1 of the first embodiment, and the principle of sound deadening / sound absorption is also the same, and therefore the description thereof is omitted.

Compared with the case of the first embodiment, the muffling damper 19 can be used in an air-conditioning duct having a large diameter to adjust the air volume, but since the number of blades is increased, the sound component 16 is generated. It is possible to increase the amount of the glass wool 6 that absorbs sound and the area covered by the punching metal 7 that reflects the sound component 16 and consumes energy.

As a result, the effect of muting the sound component 16 can be enhanced.

The preferred embodiments and use examples of the present invention have been described above, but the present invention is not limited to the above-mentioned embodiments and use examples, and they are the same within the technical scope that can be understood from the claims. It can be made into various forms that exert the action and effect of.

For example, the sound deadening damper 1 of the first embodiment uses movable blades of a size that does not form a ventilation gap at the time of fully closing, but uses movable blades that produce a slight ventilation gap at the time of fully closing. You can also

Further, in the above-mentioned embodiment, the pair of movable blades are rotated in the shape of a figure to open and close, and the opposite blade type air volume adjusting damper is equipped with glass wool, punching metal or the like as a sound deadening material. However, it is also possible to adopt a configuration in which glass wool as a sound deadening material, punching metal, or the like is attached to a parallel-wing type air volume adjustment damper in which the movable blades rotate in parallel and open and close.

That is, as long as a sound deadening material such as glass wool, a sound absorbing material and a covering material such as punching metal, and a reflecting material can be attached to the inner wall of the air volume adjusting damper and the outside of the blade, any shape conventionally used. It can also be based on the air volume adjustment damper.

Further, it is also possible to use a fire-proof damper or an air volume adjusting damper having the function of a smoke-proof damper as a base.

It should be noted that a fireproof damper having no air volume adjusting function, a smokeproof damper, a soundproof material such as glass wool on the inner wall of the fireproof / smokeproof damper itself and the outside of the blade, a sound absorbing material and a covering material such as punching metal, and a reflecting material It is also possible to attach.

Further, in the fourth embodiment, the sound deadening damper is 2
It is connected, but it can be connected to three, four ...

The connection direction is also the silencer damper 1 of the fourth embodiment.
In FIG. 7, the fixed blades 3 are brought into contact with each other, but the invention is not limited to this, and they can be connected in various directions.

By changing the number and direction of connection of the sound deadening dampers, it is possible to increase the length in the air blowing direction and realize various combinations of the directions of the fixed blades and the movable blades. The number and direction to be set can be selected according to various conditions such as the shape of the air flow passage and the pressure loss during air flow.

When punching metal is used, the size of the hole of the punching metal is such that it can cover sound absorbing material such as glass wool and can also retain the shape of glass wool and the like. If so, it can be freely determined in consideration of the muffling / sound absorbing efficiency and the reflection efficiency.

Further, in the first embodiment, the front end face of the blade,
The pointed or convex arc-shaped part of the rear end face is also formed of punching metal (FIGS. 6 (a) and 8 (b)), but the front end face and the rear end face are plate-shaped products that are not punched. It can also be molded and used.

The sound absorbing material is not limited to glass wool, and any material having sound absorbing effect such as rock wool or asbestos fibers or porous sponge, and non-woven fabric can be used. Can also be adopted.
Further, the punching metal is not limited to the metal material, and other materials can be used.

Further, the blade and the inner wall may be made of a material capable of withstanding the wind pressure in the ventilation passage and having a sound absorbing property.

[0090]

According to the present invention, the sound component is silenced and absorbed by the sound absorbing material such as glass wool in the air volume adjusting damper, and the sound component is positively reflected by the punching metal and the energy of the sound component is consumed. Therefore, there is an effect that sound can be effectively absorbed and silenced.

Further, since the sound is silenced and absorbed in the air volume adjusting damper, there is an effect that it is possible to reduce the need to separately install a silencer such as a silencer, a silencer chamber, a silencer box, and a silencer elbow.

[Brief description of drawings]

FIG. 1 is an explanatory view of a reflection state of a sound component when the movable blade of the embodiment of the present invention is fully opened.

FIG. 2 is an explanatory view of a reflected state of a sound component when the movable blade is opened by 30 ° with respect to the blowing direction.

FIG. 3 is an explanatory diagram of a reflection state of a sound component when the same is opened at 45 °.

FIG. 4 is an explanatory diagram of a reflection state of a sound component when the movable blade is fully closed.

FIG. 5 is a front view of the same state in which the movable blades are fully opened.

FIG. 6 (a) is an enlarged side view of the movable blade used in the embodiment of the present invention. (B) Similarly, a partially enlarged cross-sectional view.

FIG. 7 is an explanatory view of a mounting state of movable blades.

FIG. 8A is an explanatory view of a reflection state of a sound component when the movable blade of another embodiment of the present invention is opened at 30 ° with respect to the blowing direction. FIG. 8B is an enlarged side view of the movable blade used in the embodiment shown in FIG.

FIG. 9 is an enlarged side view of a movable blade used in another embodiment of the present invention.

FIG. 10 is an explanatory diagram of a reflection state of a sound component in an embodiment in which two silencing dampers of the present invention are used.

FIG. 11 is an explanatory diagram of a reflection state of a sound component in the embodiment of the present invention in which the number of movable blades is three and the number of fixed blades is two.

FIG. 12 is a conceptual diagram of a state in which an embodiment of the present invention is installed in an air conditioning duct.

[Explanation of symbols]

1, 17, 19, 32 Sound damping damper 2 Box bodies 3, 20, 21, 33 Fixed blades 3a, 3b, 4a, 4b, 5a, 5b, 33a, 34
a, 35a Reflective surface 4, 5, 22, 23, 24, 34, 35, 36 Movable blade 6 Glass wool 7 Punching metal 9, 10 Rotation axis

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G10K 11/16 FF term (reference) 3L080 BE02 3L081 AA02 AA03 AA08 BA01 BA05 BB06 FA03 FB01 FC01 HA08 HB02 5D061 AA11 AA12 AA22 AA25 CC01 EE11 EE14

Claims (7)

[Claims] 1. An air volume control damper having air flow rate control blades inside a box body that can be installed in a ventilation passage, wherein a sound absorbing material is layered through an inner wall of the box body and the air flow rate control damper is used. A sound-damping damper characterized by imparting sound absorption to the blades. 2. A sound deadening damper comprising a plurality of the sound deadening dampers according to claim 1 connected in series. 3. The sound deadening damper according to claim 1, wherein the sound absorbing property of the blade is generated by covering the outer periphery of the blade made of a sound absorbing material with punching metal. 4. The blades are fixed blades fixed in the box body parallel to the ventilation direction, and / or movable blades for rotating the air volume in the box body, and each blade has a vertical cross-sectional shape. ,
The sound deadening damper according to claim 1 or 2, wherein the front end surface facing the ventilation direction is formed in a pointed or convex arc shape, and the rear end surface is formed in a pointed or convex arc shape. 5. The sound deadening damper according to claim 4, wherein the thickness of each blade in the vertical cross-sectional shape is gradually reduced from the front end into which the air flows into the rear end. 6. The arrangement of the blades in the box body is that the fixed blades are arranged in the middle of the rotation axis of the movable blades and in a position not interfering with the rotation locus of the movable blades in parallel with the flow direction of the wind. The sound deadening damper according to claim 1 or 2. 7. The sound deadening damper according to claim 1, wherein the sound absorbing material is a molded product of glass wool, rock wool or asbestos fibers, or a porous sponge. .