Size-adjustable pipeline through-wall sound insulation device

Abstract

The utility model discloses a size-adjustable pipeline through-wall sound insulation device which comprises an embedded pipe embedded in the periphery of a wall hole and a sound insulation box assembly used for installing a process pipeline. The sound insulation box assembly comprises two sound insulation sealing plates, a sound absorption material, a damping vibration isolation pad and a pipe sleeve. Flanges are arranged at the two ends, extending out of the wall body, of the embedded pipe embedded in the periphery of the wall body hole correspondingly and used for being fixedly connected with the sound insulation sealing plates located on one side of the wall body through the flanges at the two ends correspondingly, so that the two sound insulation sealing plates are oppositely arranged on the two sides of the wall body, and via holes allowing the process pipeline to penetrate through are formed in the corresponding positions of the two sound insulation sealing plates. The periphery of the process pipeline is wrapped with a damping vibration isolation pad, the periphery of the damping vibration isolation pad is wrapped with a sound insulation rock wool plate serving as a sound absorption material, the periphery of the sound insulation rock wool plate is wrapped with an aluminum plate to form a sleeve, and the sleeve integrally penetrates through sound insulation sealing plates located on the two sides of a wall to form a pipeline through-wall structure. According to the utility model, the problem that the use requirements of flexible adjustment of the position and the pipe diameter of a process pipeline are difficult to meet due to the fact that a hole is reserved firstly when a wall body is built in the conventional pipeline through-wall acoustic treatment measure is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to but not limited to pipeline wall -penetrating acoustic treatment technical field, mainly belong to precision casting shell production range field, especially a size adjustable pipeline wall -penetrating sound insulation device. BACKGROUND

[0002] For the soundproof room, the soundproof room, the test bed, the high sound intensity reverberation chamber and other housing soundproofing needs are very large, and there are many process pipelines in the wall of the room, and the sound insulation sealing treatment of the pipeline wall -penetrating is very important for the realization of noise control index.

[0003] At present, the conventional wall -penetrating acoustic treatment measures that can be retrieved basically first reserve the hole when building the wall, the size of the hole is larger than the size of the sleeve, and the pipeline wall -penetrating construction is sealed again, and the main difference of different measures is the treatment of the sound insulation sleeve. However, this scheme has certain disadvantages, that is, once the position of the process pipeline is determined, the position of the hole in the wall is determined, and if the user wants to adjust the position of the process equipment, the whole wall pipeline needs to be removed, and the hole left in the wall is difficult to handle, that is, it is difficult to meet the use demand of flexible adjustment of the position and pipe diameter of the process pipeline.

[0004] The utility model mainly relates to a size adjustable pipeline wall -penetrating sound insulation structure, and mainly aims to solve the problem of the pipeline wall -penetrating sound insulation of the process pipeline that needs to be flexibly adjusted. UTILITY MODEL CONTENTS

[0005] The utility model discloses a size adjustable pipeline wall -penetrating sound insulation device to solve the problem that the use demand of flexible adjustment of the position and pipe diameter of the process pipeline cannot be met due to the hole reserved in the wall when building the wall in the existing pipeline wall -penetrating acoustic treatment measures.

[0006] The utility model discloses a size adjustable pipeline wall -penetrating sound insulation box assembly, which comprises a pre -buried pipe 1 pre -buried in the hole of the wall 11 and a sound insulation box assembly for installing a process pipeline 9.

[0007] The two ends of the pre -buried pipe 1 pre -buried in the hole of the wall 11 are respectively provided with flanges, which are respectively fixedly connected with the sound insulation sealing plate 4 on one side of the wall 11, so that the two sound insulation sealing plates 4 are arranged on the two sides of the wall 11, and the corresponding positions of the two sound insulation sealing plates 4 are provided with through holes for the process pipeline 9 to penetrate.

[0008] The outer periphery of the process pipeline 9 is wrapped with a damping vibration isolation pad 8, the outer periphery of the damping vibration isolation pad 8 is wrapped with a sound insulation rock wool board as a sound absorption material 7, and the outer periphery of the sound insulation rock wool board is wrapped with an aluminum plate to form a sleeve, the sleeve penetrates the sound insulation sealing plates 4 located on both sides of the wall body 11 as a whole, and forms a pipeline through-wall structure.

[0009] Optionally, in the size-adjustable pipeline through-wall sound insulation device as described above, the sound insulation box assembly further comprises a sealing ring 5 and a sealing glue 6.

[0010] The sealing ring 5 and the sealing glue 6 are respectively used for sealing between the sleeve and each sound insulation sealing plate 4.

[0011] Optionally, in the size-adjustable pipeline through-wall sound insulation device as described above,

[0012] The upper sand pouring hole 2 is opened in the upper column wall outside the wall body 11, and is used for pouring sand into the sound insulation box assembly through the upper sand pouring hole 2 of the embedded pipe 1 after the sound insulation box assembly is installed in the embedded pipe 1, so as to meet the sound insulation requirement of the wall body 11.

[0013] Optionally, in the size-adjustable pipeline through-wall sound insulation device as described above,

[0014] The lower sand pouring hole 12 is opened in the lower column wall outside the wall body 11, and is used for opening the lower sand pouring hole 12 of the embedded pipe 1 to completely pour out the sand 10 in the sound insulation box assembly before the sound insulation box assembly is removed, when it is required to adjust the diameter or / and position of the process pipeline 9.

[0015] Optionally, in the size-adjustable pipeline through-wall sound insulation device as described above,

[0016] A plurality of through holes are opened in the corresponding positions of the two sound insulation sealing plates 4, and are used for arranging and installing a plurality of small-diameter process pipelines 9; wherein the outer periphery of each small-diameter process pipeline 9 is sequentially wrapped with a damping vibration isolation pad 8, a sound insulation rock wool board, and an aluminum plate to form a sleeve, and each small-diameter process pipeline 9 penetrates the through hole in the corresponding position of the two sound insulation sealing plates 4, and the sealing ring 5 and the sealing glue 6 are respectively used for sealing between each small-diameter process pipeline 9 and each sound insulation sealing plate 4, to form a multi-position pipeline through-wall structure of the plurality of small-diameter process pipelines 9.

[0017] Optionally, in the size-adjustable pipeline through-wall sound insulation device as described above,

[0018] The sound insulation rock wool board has a bulk density of not less than 100 kg / m 3 .

[0019] Optionally, in the size-adjustable pipeline through-wall sound insulation device as described above,

[0020] The thickness of the aluminum plate for wrapping the sound-absorbing material 7 is 1mm.

[0021] The utility model disciouses a size adjustable pipeline wall -penetrating sound insulation device, including: the pre -buried pipe 1 of pre -buried in the wall body 11 hole mouth periphery and the sound insulation box subassembly of being used to install the process pipeline 9 with flexible adjustment feature, the pre -buried pipe 1 two ends that stretch out the wall body 11 are provided with flange respectively, are fixedly connected a sound insulation sealing plate 4 through two end flanges respectively, make two sound insulation sealing plates 4 be opposite and set up in the wall body 11 both sides, the outer periphery of process pipeline 9 is formed through the sleeve pipe of wrapping damping vibration isolation pad 8, sound insulation rock wool board and aluminum plate, and the sleeve pipe whole penetrates the sound insulation sealing plate 4 located in the wall body 11 both sides, thereby forming pipeline wall -penetrating structure, in addition, through the sand injection hole 2 of setting on the pre -buried pipe 1 injects sand 10 to satisfy the sound insulation amount requirement of wall body 11, and when having the diameter or / and position requirement of adjusting process pipeline 9, through the sand release hole 12 of setting on the pre -buried pipe 1 release sand 10 in sound insulation box subassembly, the pipeline wall -penetrating structure formed by the utility model embodiment not only can effectively reduce the vibration of process pipeline 9, prevent the transmission of noise through the hole gap of wall body 11, but also can adjust the position and pipe diameter of process pipeline 9 through the mode of replacing the sound insulation box subassembly of pipeline wall -penetrating, satisfy the use demand of the flexible adjustment of the position and pipe diameter of process pipeline 9 of use party, further, for the case of multiple small pipe diameter pipeline group, the pipeline wall -penetrating sound insulation device provided by the utility model embodiment has greater advantage, under the premise of not influencing the overall sound insulation amount of wall surface, the later stage pipeline adjustment scheme of the utility model is more flexible.

[0022] Particularly, in the high noise environment room such as test bench, high sound intensity reverberation chamber and the like, the pipeline wall -penetrating sound insulation device provided by the utility model has wide practicability. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are used to provide further understanding of the technical scheme of the utility model, and constitute a part of the specification, and are used together with the embodiments of the application to explain the technical scheme of the utility model, and do not constitute the limitation to the technical scheme of the utility model.

[0024] Figure 1 A sectional view of the size adjustable pipeline wall -penetrating sound insulation device provided by the utility model embodiment is shown in the figure.

[0025] Figure 2 For Figure 1 A front view of the size adjustable pipeline wall -penetrating sound insulation device provided by the embodiment shown in the figure.

[0026] Figure 3The utility model discloses a sectional view of another size adjustable pipeline wall -penetrating sound insulation device provides for the embodiment of the utility model.

[0027] Figure 4 For Figure 3 The utility model discloses a front view of size adjustable pipeline wall -penetrating sound insulation device provides for the embodiment shown.

[0028] Mark explanation:

[0029] 1 - embedded pipe, 2 - upper sand hole, 3 - sealing plate flange, 4 - sound insulation sealing plate, 5 - sealing ring, 6 - sealant, 7 - sound absorption material, 8 - damping vibration isolation pad, 9 - process pipeline 10 - sand, 11 - wall, 12 - lower sand hole. Specific embodiments

[0030] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following will be combined with the drawings to the embodiment of the utility model detailed description.It needs to be explained that in the case where there is no conflict, the embodiment in the application and the feature in the embodiment can be combined with each other at will.

[0031] It has been explained in the above background art that the sound insulation sealing treatment of pipeline wall -penetrating plays an important role in noise control index; in specific construction, the hole is often left at the pipeline wall -penetrating, and the sealing is not tight, so that the noise hazard is left, according to the sound propagation principle, 90% of the sound energy is leaked through 1% of the hole area, which is easy to make the effect of other sound insulation measures greatly discounted.Therefore, the process pipeline wall -penetrating not only needs to consider the pipeline vibration isolation, but also needs to consider the acoustic sealing measures.

[0032] The existing pipeline wall -penetrating acoustic treatment measures, due to the demand in the construction wall, first reserve the hole, and the pipeline wall -penetrating is sealed after construction; the existing treatment measures have the problems that: once the position of the process pipeline is determined, the position of the hole in the wall surface is determined, and if the user wants to adjust the position of the process equipment, the whole wall surface pipeline needs to be removed, and the hole left in the wall surface is difficult to handle, that is, it is difficult to meet the use demand of flexible adjustment of the position and pipe diameter of the process pipeline.

[0033] In order to realize the use demand of flexible adjustment of the position and pipe diameter of the process pipeline, and cannot affect the acoustic sealing effect and the overall sound insulation of the wall surface, the utility model embodiment provides a size adjustable pipeline wall -penetrating sound insulation device, wherein the main components include a size adjustable pipeline wall -penetrating sound insulation sound insulation box assembly, mainly used for the sound insulation sealing of the process equipment pipeline wall -penetrating, and the sound insulation box assembly in the utility model can meet the demand of late adjustment of the process pipeline.

[0034] The utility model provides the following several specific embodiments can be combined, and the same or similar concept or process can not be described in some embodiments.

[0035] Figure 1 A sectional view of the size-adjustable pipeline wall-penetrating sound insulation device is provided in the embodiment of the utility model, Figure 2 To Figure 1 The size-adjustable pipeline wall-penetrating sound insulation device is provided in the embodiment shown in the utility model. As Figure 1 And Figure 2 The size-adjustable pipeline wall-penetrating sound insulation device provided in the embodiment of the utility model comprises two parts:

[0036] One part is a pre-buried pipe 1 pre-buried in the hole opening of the wall body 11; the other part is a sound insulation box assembly used for installing the process pipeline 9. The sound insulation box assembly in the embodiment of the utility model comprises two sound insulation sealing plates 4, sound-absorbing material 7, damping vibration isolation pads 8 and a pipe sleeve.

[0037] As Figure 1 And Figure 2 The two ends of the pre-buried pipe 1 pre-buried in the hole opening of the wall body 11 extending out of the wall body 11 are respectively provided with flanges, which are used for fixedly connecting the sound insulation sealing plates 4 located on one side of the wall body 11 through the two end flanges, so that the two sound insulation sealing plates 4 are oppositely arranged on the two sides of the wall body 11, and the corresponding positions of the two sound insulation sealing plates 4 are provided with through holes for the process pipeline 9 to penetrate. It should be noted that the corresponding positions of the sound insulation sealing plate 4 also have sealing plate flanges 3 corresponding to the flanges of the pre-buried pipe 1.

[0038] As Figure 1 And Figure 2 In the embodiment of the utility model, the outer periphery of the wall-penetrating process pipeline 9 is wrapped with the damping vibration isolation pads 8, the outer periphery of the damping vibration isolation pads 8 is wrapped with the sound-absorbing rock wool board as the sound-absorbing material 7, and the outer periphery of the sound-absorbing rock wool board is wrapped with the aluminum plate to form a sleeve, and the sleeve penetrates the sound insulation sealing plates 4 located on the two sides of the wall body 11 as a whole to form a structure of the pipeline penetrating the wall.

[0039] It should be noted that the sound insulation box assembly in the embodiment of the utility model further comprises a sealing ring 5 and sealing glue 6; in the specific implementation, the sealing ring 5 and the sealing glue 6 are used for plugging between the sleeve and each sound insulation sealing plate 4.

[0040] In one implementation mode of the embodiment of the utility model, the pre-buried pipe 1 pre-buried in the hole opening of the wall body 11 is provided with an upper sand pouring hole 2 in the upper column wall outside the wall body 11, which is used for pouring sand in the interior of the sound insulation box assembly after the sound insulation box assembly is installed in the pre-buried pipe 1, so as to meet the sound insulation requirement of the wall body 11.

[0041] Further, the pre-embedded pipe 1 pre-embedded in the hole opening of the wall 11 is provided with a sand hole 12 in the lower column wall outside the wall 11, which is used to open the sand hole 12 of the pre-embedded pipe 1 when it is required to adjust the diameter or / and position of the process pipe 9, and then the sound insulation box assembly is removed before the whole sound insulation box assembly is removed.

[0042] In an implementation manner of the embodiment of the present application, another structural form of the pipe wall-penetrating structure is provided, as shown in Figure 3 , which is a sectional view of another size-adjustable pipe wall-penetrating sound insulation device provided by the embodiment of the present application, Figure 4 , which is a front view of the size-adjustable pipe wall-penetrating sound insulation device provided by the embodiment shown in Figure 3 , which is a front view of the size-adjustable pipe wall-penetrating sound insulation device provided by the embodiment shown in Figure 3 and Figure 4 , the size-adjustable pipe wall-penetrating sound insulation device provided by the implementation manner is different from the above-mentioned Figure 1 and Figure 2 , which is used for arranging a plurality of small-diameter process pipes 9.

[0043] In the implementation manner, a plurality of through holes are arranged at the corresponding positions of the two sound insulation sealing plates 4, which are used for arranging and installing the plurality of small-diameter process pipes 9; wherein, after the outer periphery of each small-diameter process pipe 9 is wrapped with the damping vibration isolation pad 8, the sound insulation rock wool board, and the aluminum plate to form a sleeve, the small-diameter process pipe 9 passes through the through hole at the corresponding position of the two sound insulation sealing plates 4, respectively, and the small-diameter process pipe 9 and each sound insulation sealing plate 4 are sealed by the sealing ring 5 and the sealing glue 6, respectively, to form a multi-position pipe wall-penetrating structure of the plurality of small-diameter process pipes 9.

[0044] The adjustable-size pipe wall penetration sound insulation device provided in this embodiment includes: a pre-embedded pipe 1 embedded around the opening of a wall 11, and a sound insulation box assembly for installing a process pipe 9 and having flexible adjustment features; flanges are respectively provided at both ends of the pre-embedded pipe 1 extending out of the wall 11, and a sound insulation sealing plate 4 is fixedly connected to each end of the flanges, so that the two sound insulation sealing plates 4 are arranged opposite to each other on both sides of the wall 11; the outer periphery of the process pipe 9 is formed by wrapping a damping vibration isolation pad 8, a sound insulation rock wool board and an aluminum plate to form a sleeve, and the entire sleeve passes through the sound insulation sealing plates 4 located on both sides of the wall 11, thereby forming a pipe wall penetration structure; in addition, sand 10 is injected through the upper sand injection hole 2 provided on the pre-embedded pipe 1 to meet the sound insulation requirements of the wall 11; and when there is a need to adjust the diameter and / or position of the process pipe 9, the sand 10 in the sound insulation box assembly is released through the lower sand release hole 12 provided on the pre-embedded pipe 1. The pipe penetration structure formed by this embodiment of the invention can not only effectively reduce the vibration of the process pipe 9 and prevent noise transmission through the gaps in the wall 11, but also allow for adjustment of the position and diameter of the process pipe 9 by replacing the sound insulation box assembly, thus meeting the user's need for flexible adjustment of the position and diameter of the process pipe 9. Furthermore, for multiple small-diameter pipe groups, the pipe penetration sound insulation device provided by this embodiment of the invention has a greater advantage, as the subsequent pipe adjustment scheme of this invention is more flexible without affecting the overall sound insulation of the wall.

[0045] In particular, the pipe penetration sound insulation device provided by this utility model has wide applicability in high-noise environments such as test benches and high-intensity reverberation chambers, where there are many process pipes, complex usage requirements, and the possibility of later modification.

[0046] The following specific implementation examples illustrate the implementation of the adjustable-size pipe wall sound insulation device provided by this utility model.

[0047] Implementation Example 1

[0048] Reference Figure 1 and Figure 2 As shown in the embodiment example 1, there is a construction form of the adjustable-size pipe through-wall sound insulation device. In this construction form, a process pipe 9 is laid out. The pipe through-wall sound insulation device includes two parts: a pre-embedded pipe 1 pre-embedded around the opening of the wall 11, and a sound insulation box assembly.

[0049] The soundproof box assembly includes: two soundproof sealing plates 4, sound-absorbing material 7, damping vibration isolation pads 8, pipe sleeve, sealing ring 5, and sealant 6; and the pre-embedded pipe 1 is provided with an upper sand injection hole 2 and a lower sand release hole 12.

[0050] A damping and vibration-damping pad 8 is wrapped around the outer periphery of the process pipeline 9. The outer periphery of the damping and vibration-damping pad 8 is wrapped with a density of not less than 100 kg / m³.3 The sound insulation rock wool board as the sound absorption material 7, the damping shock pad 8 and the thickness of the sound insulation rock wool board are determined according to the diameter of the process pipeline 9, and the outer periphery of the sound insulation rock wool board is wrapped with a 1mm aluminum plate to form a sleeve; the sleeve is sealed and blocked by the sealing ring 5 and the sealing glue 6 between the sleeve and each sound insulation sealing plate 4.

[0051] The embedded pipe 1 in the embodiment example 1 is a fixed structure, and the position and structure are not adjustable; the sound insulation box assembly is an adjustable assembly in the pipeline wall sound insulation device, and the construction and replacement mode of the sound insulation box assembly are as follows:

[0052] A larger hole is reserved on the wall body 11, the hole is reserved with the embedded pipe 1 with a flange, for example, a circular or rectangular steel pipe, the sound insulation box assembly of the wall pipeline is processed and installed, and the inside of the sound insulation box assembly is injected with sand through the upper sand injection hole 2 on the embedded pipe 1 to meet the wall sound insulation requirement.

[0053] When the diameter and / or position of the process pipeline 9 needs to be adjusted, the whole wall pipeline sound insulation box assembly is removed, the adjustment mode is that the sand soil 10 in the sound insulation box assembly is completely discharged through the lower sand discharge hole 2 on the embedded pipe 1, then the whole wall pipeline sound insulation box assembly is removed, the process pipeline 9 is adjusted according to the requirement, then the wall pipeline sound insulation box assembly is processed according to the latest pipeline position and pipe diameter, and the above installation measures are repeated.

[0054] Embodiment example 2

[0055] Referring to Figs. 1 and 2, Figure 3 and Figure 4 Another structure form of the size-adjustable pipeline wall sound insulation device is provided in the embodiment example 2, a plurality of small-diameter process pipelines 9 are arranged in the structure form, and the two-part structure of the pipeline wall sound insulation device is similar to that in the above embodiment example 1, and the difference lies in that a plurality of through holes are arranged at the corresponding positions of the two sound insulation sealing plates 4, and the plurality of small-diameter process pipelines 9 are arranged and installed.

[0056] It should be noted that for the case of a plurality of small-diameter pipeline groups, the pipeline wall sound insulation device provided in the embodiment of the utility model has greater advantages, and the pipeline adjustment scheme of the utility model is more flexible on the premise of not affecting the overall wall sound insulation.

[0057] Although the embodiments of the utility model are disclosed above, the content is only the embodiment adopted for the convenience of understanding the utility model, and is not used to limit the utility model. Any person skilled in the art of the utility model can make any modification and change in the implementation form and details without departing from the spirit and range of the utility model disclosed, but the patent protection range of the utility model still needs to be limited by the range defined by the attached claims.

Claims

1. A pipe wall penetration sound insulation device with adjustable size, characterized in that, include: The embedded pipe (1) is embedded around the opening in the wall (11), and the soundproof box assembly is used to install the process pipe (9); The soundproof box assembly includes: two soundproof sealing plates (4), sound-absorbing material (7), damping vibration isolation pads (8), and a tube sleeve; Among them, the pre-embedded pipe (1) pre-embedded around the opening of the wall (11) has flanges at both ends of the wall (11) to be fixedly connected to the sound insulation sealing plate (4) located on one side of the wall (11) through the flanges at both ends, so that the two sound insulation sealing plates (4) are set opposite to each other on both sides of the wall (11), and the corresponding positions of the two sound insulation sealing plates (4) are provided with through holes for the process pipeline (9) to pass through. The process pipe (9) is wrapped with a damping vibration isolation pad (8), and the damping vibration isolation pad (8) is wrapped with a sound insulation rock wool board as a sound absorption material (7). The sound insulation rock wool board is wrapped with an aluminum plate to form a sleeve. The sleeve runs through the sound insulation sealing plate (4) located on both sides of the wall (11) to form a pipe through the wall structure.

2. The adjustable-size pipe wall-penetrating sound insulation device according to claim 1, characterized in that, The soundproof box assembly also includes: a sealing ring (5) and sealant (6); The sleeve is sealed to each soundproof sealing plate (4) using a sealing ring (5) and sealant (6).

3. The adjustable-size pipe wall-penetrating sound insulation device according to claim 1, characterized in that, The pre-embedded pipe (1) embedded around the opening of the wall (11) has an upper sand injection hole (2) on the upper column wall outside the wall (11). After the sound insulation box assembly is installed in the pre-embedded pipe (1), the sound insulation box assembly is injected with sand through the upper sand injection hole (2) of the pre-embedded pipe (1) to meet the sound insulation requirements of the wall (11).

4. The adjustable-size pipe wall-penetrating sound insulation device according to claim 3, characterized in that, The pre-embedded pipe (1) embedded around the opening of the wall (11) has a sand release hole (12) on the lower column wall outside the wall (11). When there is a need to adjust the diameter and / or position of the process pipe (9), the sand release hole (12) of the pre-embedded pipe (1) is opened before the sound insulation box assembly is completely removed, so that the sand (10) inside the sound insulation box assembly is completely released before the sound insulation box assembly of the through-wall process pipe (9) is removed.

5. The adjustable-size pipe wall-penetrating sound insulation device according to any one of claims 1 to 4, characterized in that, Multiple through holes are provided at corresponding positions of the two soundproof sealing plates (4) for the installation of multiple small-diameter process pipes (9); each small-diameter process pipe (9) is wrapped with a damping vibration isolation pad (8) and a sound insulation rock wool board in sequence, and then wrapped with an aluminum plate to form a sleeve, which passes through the through holes at corresponding positions in the two soundproof sealing plates (4), and each small-diameter process pipe (9) is sealed with a sealing ring (5) and a sealant (6) respectively, forming a multi-position pipe wall-penetrating structure for multiple small-diameter process pipes (9).

6. The adjustable-size pipe wall-penetrating sound insulation device according to any one of claims 1 to 4, characterized in that, The density of the sound-insulating rock wool board is not less than 100 kg / m³. 3 .

7. The adjustable-size pipe wall-penetrating sound insulation device according to any one of claims 1 to 4, characterized in that, The thickness of the aluminum plate used to wrap the sound-absorbing material (7) is 1 mm.

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