Sound damping device

Abstract

In a sound damping device (100) having an absorption body (110) with an input opening (111) for the input of sound waves to be damped, and an output opening (112) opposite the input opening (111), effective sound absorption over a broad frequency spectrum is achieved in that the absorption body (110) has a first end (113) close to the input opening (111) and a second end (114) opposite the first end (113) and close to the output opening (112), which are connected to each other via a central axis (115), wherein one or more sound conducting walls (120) are formed laterally of the central axis (115) between the first end (113) and the other end (114), which sound conducting walls increase in width outwards at the input opening (111) starting close to the central axis towards the second end (114), and end in the region of the second end (114) at a terminating edge (130), the starting point (131) of which adjoins the central axis (115) and the end point (132) of which is arranged at a predetermined distance from the central axis (115).

Description

[0001] The invention relates to a sound damping device with an absorption body with an inlet opening for the

[0002] Input of sound waves to be damped and one of the

[0003] Entrance opening opposite exit opening for the

[0004] Emission of sound waves.

[0005] Sound dampening devices of the type mentioned above, often without an outlet opening, are known in the state of the art in a large number of different designs and are used for very different specific

[0006] The well-known soundproofing

[0007] However, devices have the disadvantage that a high

[0008] Efficient sound absorption can only be achieved with considerable technical and thus also considerable cost. The object of the invention is therefore to create a sound-damping device in which effective sound absorption can be achieved cost-effectively across a broad frequency spectrum using comparatively simple means.

[0009] For a sound damping device of the type mentioned at the outset, this object is achieved according to the invention in that the absorption body has a first end close to the inlet opening and a second end opposite the first end and close to the outlet opening, which are connected to one another via a central axis, wherein one or more sound guide walls are formed laterally of the central axis between the first end and the other end, which begin at the inlet opening close to the central axis and increase in width outwards towards the second end and end in the region of the second end at a terminal edge, the starting point of which borders on the central axis and the end point of which is arranged at a predetermined distance from the central axis.

[0010] Preferred embodiments of the invention are the subject of the subclaims, the elements of which act in the sense of a further improvement of the approach to solving the problem underlying the invention.

[0011] In the sound damping device according to the invention, by means of the combination of features that the absorption body has a first end close to the inlet opening and a second end opposite the first end and close to the outlet opening, which are connected to one another via a central axis, wherein one or more sound guide walls are formed laterally of the central axis between the first end and the other end, which begin at the inlet opening close to the central axis and increase in width outwards towards the second end and end in the region of the second end at a terminal edge, the starting point of which borders the central axis and the end point of which is arranged at a predetermined distance from the central axis, it is achieved that with the aid of the sound guide walls with varying widths, resonance bodies for different frequencies are created,In particular, when the exit opening is placed in front of a sound reflection wall, a desired sound cancellation takes place within a sound guide wall.

[0012] According to a first preferred embodiment of the sound damping device according to the invention, it is provided that the width of a respective sound guide wall increases linearly starting at the inlet opening near the central axis towards the other end, wherein the first end of the absorption body is opposite the end point of the end edge remote from the central axis via a straight connecting line, and wherein a respective outer edge of a sound guide wall comes to lie on the connecting line.

[0013] According to an alternative preferred embodiment of the sound damping device according to the invention, the width of the sound guide walls increases non-linearly starting at the inlet opening near the central axis towards the other end, wherein the first end of the absorption body is opposite the end point of the end edge remote from the central axis via a concavely curved connecting line, and wherein a respective outer edge of a sound guide wall comes to lie on the connecting line.

[0014] A sound guide wall is preferably designed as a hollow rail open in the direction of the first end of the absorption body.

[0015] In some applications, it may also be necessary for a sound baffle to be designed as a rail that is at least partially concave in the direction of the second end of the absorption body.

[0016] According to an important preferred embodiment of the sound-damping device according to the invention, a sound-guiding wall is designed as a rail that is at least partially convex in the direction of the second end of the absorption body. An outer edge of a sound-guiding wall can be curved more sharply toward the first end of the absorption body than the inner wall opposite the outer edge.

[0017] The end edge of a sound deflector is preferably aligned perpendicular to the central axis. However, according to alternative embodiments, the end edge can be aligned at a predetermined angle to the central axis, with the end point of the end edge extending beyond the starting point by way of an extended outer edge.

[0018] According to a further preferred embodiment of the sound damping device according to the invention, one or more sound diffusion elements are arranged in the area of ​​the surface of a sound guide wall, the starting point of which is adjacent to the central axis and the end point of which is located at the outer edge of the respective sound guide wall.

[0019] According to a further important preferred embodiment of the sound damping device according to the invention, a sound reflection element is arranged in the region of the end edge of a sound baffle, which is aligned at right angles to the surface of the sound baffle, the starting point of which element is adjacent to the central axis and the end point of which element is located at the outer edge of the respective sound baffle.

[0020] In the case of two sound guide walls, the absorption body is preferably designed to be rotationally symmetrical with respect to a rotation of 180° around the central axis, in the case of three sound guide walls it is designed to be rotationally symmetrical with respect to a rotation of 120° around the central axis, and in the case of four sound guide walls it is designed to be rotationally symmetrical with respect to a rotation of 90° around the central axis.

[0021] Furthermore, the absorption body is preferably made of a dimensionally stable, hard material such as ABS (acrylonitrile butadiene styrene copolymer) or BLA (a polylactide). Furthermore, the absorption body can be made of a metal such as stainless steel or aluminum, or even concrete.

[0022] For the manufacturing process of the absorption body, EDM (Fused Deposition Modeling) is planned.

[0023] The absorption body according to the invention preferably has a height in the range of 5 cm to 50 cm and in particular of approximately 30 cm from the first end to the other end, wherein the end edge of a sound-conducting device preferably has a width in the range of 2 cm to 40 cm and in particular of approximately 20 cm.

[0024] One or more absorption bodies may preferably be placed in front of a sound reflection wall, wherein the central axis of each absorption body is arranged perpendicular to the surface of the sound reflection wall and a respective outlet opening of the absorption body is arranged opposite the sound reflection wall.

[0025] The sound-damping device according to the invention is explained below using a preferred embodiment, which is illustrated in the figure of the drawing. Therein:

[0026] Fig. 1 shows a preferred embodiment of the sound-damping device according to the invention in a side view; Fig. 2 shows the preferred embodiment of the sound-damping device according to the invention shown in Fig. 1 in a side view from above;

[0027] Fig. 3 shows a preferred embodiment of the sound damping device according to the invention shown in Fig. 1 in a side view from below.

[0028] The sound damping device 100 according to the invention shown in Figures 1 to 3 contains an absorption body 110 with an inlet opening 111 for the input of sound waves to be damped and an outlet opening 112 opposite the inlet opening 111, wherein the absorption body 110 has a first end 113 close to the inlet opening 111 and a second end 114 opposite the first end 113 and close to the outlet opening 112, which are connected to one another via a central axis 115, and wherein one or more sound guide walls 120 are formed laterally of the central axis 115 between the first end 113 and the other end 114.

[0029] The sound guide walls 120 begin close to the central axis at the entrance opening 111 and increase in width outwards towards the second end 114 and end in the area of ​​the second end 114 at a terminal edge 130, the starting point of which

[0030] 131 borders the central axis 115 and whose end point

[0031] 132 is arranged at a predetermined distance from the central axis 115. The width of a respective sound guide wall 120 increases linearly, starting at the inlet opening 111 near the central axis, to the other end 114, wherein the first end 113 of the absorption body 110 is opposite the end point 132 of the end edge 130 remote from the central axis 115 via a straight connecting line 140, and wherein a respective outer edge of a sound guide wall 120 comes to lie on the connecting line 140.

[0032] A sound guide wall 120 is designed as a hollow rail which is open in the direction of the first end 113 of the absorption body 110 and which is at least partially convex in the direction of the second end 114 of the absorption body 110.

[0033] In this case, an outer edge of a sound guide wall 120 is curved more sharply toward the first end of the absorption body 110 than the inner wall opposite the outer edge. The end edge 130 of a sound guide wall 120 is oriented perpendicular to the central axis 115.

[0034] According to the embodiment of the sound damping device 100 according to the invention shown in Figure 2, one or more sound diffusion elements 150 are arranged in the region of the surface of a sound baffle 120, the starting point of each of which borders on the central axis 115 and the end point 132 of which lies on the outer edge of the respective sound baffle 120. According to the preferred embodiment of the sound damping device 100 according to the invention shown in Figure 2, a sound reflection element 160 is arranged in the region of the end edge 130 of a sound baffle 120 and is oriented at right angles to the surface of the sound baffle 120, the starting point 131 of which borders on the central axis 115 and the end point 132 of which lies on the outer edge of the respective sound baffle 120.

[0035] The absorption body 110 shown is provided with three sound guide walls 120 and is rotationally symmetrical with respect to a rotation of 120° around the central axis 115.

[0036] The absorption body 110 is made of a dimensionally stable hard material, in this case ABS (acrylonitrile butadiene styrene copolymer).

[0037] The absorption body 110 has a height of approximately 30 cm from the first end 113 to the other end 114, with the end edge 130 of a sound conducting device having a width of 20 cm.

[0038] According to the invention, one or more of the illustrated absorption bodies 110 are placed in front of a sound reflection wall 200, wherein the central axis 115 of each absorption body 110 is arranged at right angles to the surface of the sound reflection wall 200 and a respective outlet opening 112 of the absorption body 110 is arranged opposite the sound reflection wall 200.

[0039] The embodiment of the invention explained above serves only for the purpose of a better understanding of the inventive teaching specified by the claims, which as such is not limited by the embodiment.

[0040] List of reference symbols

[0041] Sound damping device absorption body inlet opening outlet opening first end other end central axis outer edge

[0042] Sound guide walls End edge Starting point End point Straight connecting line Sound diffusion elements Sound reflection element Sound reflection wall

Claims

CHANGED CLAIMS received at the International Bureau on 30 August 2023 (30.08.2023) 1. Sound attenuation device (100) with an absorption body (110) having an inlet opening (111) for the input of sound waves to be attenuated and an outlet opening (112) opposite the inlet opening (111), wherein the absorption body (110) has a first end (113) near the inlet opening (111) and a second end (114) opposite the first end (113) and near the outlet opening (112), which are connected to each other via a central axis (115), wherein one or more sound guide walls (120) are formed laterally to the central axis (115) between the first end (113) and the second end (114), which increase in width outwards from the inlet opening (111) towards the second end (114) and terminate at a termination edge (130) in the region of the second end (114), the starting point (131) of which adjacent to the central axis (115) and whose endpoint (132) is arranged at a predetermined distance from the central axis (115),characterized in that one or more sound diffusion elements (150) are arranged in the area of ​​the surface of a sound-guiding wall (120), the starting point (131) of which is adjacent to the central axis (115) and the end point (132) of which is located at the outer edge of the sound-guiding wall (120).

2. Sound attenuation device (100) according to claim 1, characterized in that the width of a corresponding sound guide wall (120) increases linearly from the inlet opening (111) near the central axis to the other end (114), wherein the first end (113) of the absorption body (110) is opposite the endpoint (132) of the end edge (130) furthest from the central axis (115) via a straight connecting line (140), AMENDED SHEET (ARTICLE 19) and wherein each outer edge of a sound-absorbing wall (120) lies on the connecting line (140).

3. Sound attenuation device (100) according to claim 1, characterized in that the width of the sound guide walls (120) increases non-linearly from the inlet opening (111) near the central axis to the other end (114), wherein the first end (113) of the absorption body (110) is opposite the endpoint (132) of the end edge (130) furthest from the central axis (115) via a concavely curved connecting line, and wherein a respective outer edge of a sound guide wall (120) lies on the connecting line (140).

4. Sound damping device (100) according to one of the preceding claims, characterized in that a sound guide wall (120) is designed as a hollow rail open towards the first end of the absorption body (110).

5. Sound damping device (100) according to one of the preceding claims, characterized in that a sound guide wall (120) is designed as a rail that is at least partially convex in the direction of the second end (114) of the absorption body (110).

6. Sound damping device (100) according to one of the preceding claims, characterized in that a sound guide wall (120) is designed as a rail that is at least partially concave in the direction of the second end (114) of the absorption body (110). AMENDED SHEET (ARTICLE 19) 1. Sound damping device (100) according to one of claims 4 to 6, characterized in that an outer edge of a sound-guiding wall (120) is bent more strongly towards the first end (113) of the absorption body (110) than the inner wall opposite the outer edge.

8. Sound damping device (100) according to one of the preceding claims, characterized in that the end edge (130) is aligned perpendicular to the central axis (115).

9. Sound attenuation device (100) according to one of the preceding claims, characterized in that the end edge (130) is at a predetermined angle to the central axis (115) is aligned, wherein the endpoint (132) of the closing edge (130) extends beyond the starting point of the closing edge (130) by way of an extended outer edge. AMENDED SHEET (ARTICLE 19)

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