CN220851084U - Composite felt for sound insulation of pipeline - Google Patents
Composite felt for sound insulation of pipeline Download PDFInfo
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- CN220851084U CN220851084U CN202322803244.0U CN202322803244U CN220851084U CN 220851084 U CN220851084 U CN 220851084U CN 202322803244 U CN202322803244 U CN 202322803244U CN 220851084 U CN220851084 U CN 220851084U
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- sound
- absorbing cotton
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- pipeline
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- 239000002131 composite material Substances 0.000 title claims abstract description 77
- 238000009413 insulation Methods 0.000 title claims abstract description 36
- 229920000742 Cotton Polymers 0.000 claims abstract description 99
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 63
- 238000013016 damping Methods 0.000 claims abstract description 63
- 239000010410 layer Substances 0.000 claims description 96
- 239000011888 foil Substances 0.000 claims description 41
- 239000012790 adhesive layer Substances 0.000 claims description 22
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims 2
- 238000000576 coating method Methods 0.000 abstract description 22
- 229920005549 butyl rubber Polymers 0.000 abstract description 20
- 239000011248 coating agent Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 7
- 230000037303 wrinkles Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 description 27
- 238000005253 cladding Methods 0.000 description 21
- 239000012530 fluid Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000005030 aluminium foil Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Laminated Bodies (AREA)
Abstract
The present utility model provides a composite mat for sound insulation of a pipe, comprising: the composite damping sheet comprises a butyl rubber layer and a honeycomb aluminum film layer which are alternately arranged, and the butyl rubber layer of the composite damping sheet is used for being bonded with the outer wall of the pipeline; the sound absorbing cotton is fixedly connected with a honeycomb aluminum film layer of the composite damping sheet. The sound absorbing cotton and the composite damping sheet are arranged as a whole; compared with the mode of coating the damping fin and the sound-absorbing cotton separately in the prior art, the method reduces the step of coating the sound-absorbing cotton and the composite damping fin, avoids the problem of wrinkles between the composite damping fin and the sound-absorbing cotton in the coating process, and effectively improves the sound insulation performance.
Description
Technical Field
The utility model relates to a pipeline sound insulation device, in particular to a composite felt for pipeline sound insulation.
Background
When a pipeline is used for conveying fluids such as water flow, gas and the like, the fluids flow in the pipeline, various vortex and turbulence are formed in the fluids due to the viscosity and inertia of the fluids, and the vortex and the turbulence change the speed and the pressure of the fluids, so that sound waves are generated; in addition, when the fluid passes through the bending and branching parts of the pipeline, vortex and turbulence are generated, and the generation of noise is further increased; when the fluid passes through the pipeline, the fluid rubs with the wall surface of the pipeline, so that the fluid generates energy loss, heat and noise are generated, and when the speed of the fluid is high, the noise generated by the friction of the wall surface of the pipeline is more obvious.
The damping fin is coated on the surface of the pipeline generally, the existing damping fin is composed of a layer of butyl rubber and a layer of aluminum film, sound absorbing cotton is arranged on the damping fin to further improve the sound insulation effect, the damping fin and the sound absorbing cotton are usually from different factories, the damping fin and the sound absorbing cotton need to be coated separately during construction, the damping fin and the sound absorbing cotton are connected in a bonding mode, wrinkles are prone to occurring in the coating process, sound leakage is caused, the sound insulation effect is affected, and the construction efficiency is low.
Disclosure of utility model
The utility model aims to provide a composite felt for pipeline sound insulation, and aims to solve the technical problems of improving sound insulation performance and construction efficiency.
The utility model is realized by the following technical scheme:
a composite mat for sound insulation of a pipe, comprising:
The composite damping sheet comprises a butyl rubber layer and a honeycomb aluminum film layer which are alternately arranged, and the butyl rubber layer of the composite damping sheet is used for being bonded with the outer wall of the pipeline;
The sound absorbing cotton is fixedly connected with a honeycomb aluminum film layer of the composite damping sheet.
The composite damping sheet is formed by alternately arranging a butyl rubber layer and a honeycomb aluminum film layer; the butyl rubber layer is high in elasticity and density, and after the butyl rubber layer coats the outer wall of the pipeline, gaps and holes on the outer wall of the pipeline can be sealed, the transmission of high-frequency noise generated by fluid in the pipeline can be reduced, vibration of the pipeline can be reduced, and low-frequency noise generated by vibration of the pipeline can be reduced; the hexagons used for forming honeycomb shapes in the honeycomb aluminum film layer can effectively disperse and absorb sound transmitted through the pipeline, so that the transmission of high-frequency noise and low-frequency noise is further reduced, and the sound is effectively restrained from being diffused as a barrier is added on the outer wall of the pipeline.
By combining the sound absorbing cotton and the composite damping sheet, the sound insulation effect is further enhanced. The sound absorbing cotton is a material capable of absorbing and consuming sound energy, and noise is absorbed by the sound absorbing cotton after passing through the composite damping sheet, so that the transmission of the noise is greatly reduced. Meanwhile, the sound absorbing cotton and the composite damping sheet are arranged as a whole; compared with the mode of coating the damping fin and the sound-absorbing cotton separately in the prior art, the method reduces the step of coating the sound-absorbing cotton and the composite damping fin, avoids the problem of wrinkles between the composite damping fin and the sound-absorbing cotton in the coating process, and effectively improves the sound insulation performance.
In addition, the damping fin and the sound absorbing cotton are integrally designed, so that the construction efficiency is improved. In the prior art, damping sheets and sound absorbing cotton are required to be coated separately, so that the construction complexity and time cost are increased. The composite felt can be completed by coating only once during construction, so that the construction flow is greatly simplified, the time cost is saved, and the construction efficiency is improved.
Further, an aluminum foil layer is arranged on one side surface of the sound absorbing cotton, which is far away from the composite damping sheet.
The aluminum foil layer has excellent ability to reflect sound. When the sound impinges on the aluminum foil layer, most of the sound energy is reflected instead of absorbed, which effectively prevents the propagation of the sound. The aluminum foil layer is arranged on the sound absorbing cotton, so that a layer of barrier for reflecting sound is added outside the sound absorbing cotton, and the sound insulation effect is further enhanced.
The aluminum foil layer is light and thin, the total weight of the composite felt cannot be obviously increased, so that the construction operation is not greatly influenced, the setting of the aluminum foil layer is further illustrated, the sound insulation effect is enhanced, and meanwhile, the convenience of construction is still maintained.
Further, a first bonding layer is arranged between the sound absorbing cotton and the composite damping sheet;
A second bonding layer is arranged between the aluminum foil layer and the sound absorbing cotton.
The first bonding layer bonds the sound absorbing cotton and the composite damping sheet together to prevent relative displacement or separation in the use process; the second adhesive linkage is in the same place the aluminium foil layer with inhale the cotton adhesion of sound, guarantees the collaborative work of aluminium foil layer and inhale the cotton, and the aluminium foil layer will not be inhaled cotton absorbing noise reflection back and inhale cotton and compound damping piece, further improves the sound insulation performance.
The first bonding layer and the second bonding layer have elasticity, and normal cladding of the composite felt is not affected.
Further, the thickness of the sound-absorbing cotton is not more than 13 mm.
The thinner sound-absorbing cotton can reduce displacement and damage caused by vibration, improve the anti-vibration performance of the composite felt and further reduce low-frequency noise generated by vibration of a pipeline;
The thickness of the sound-absorbing cotton is set to be not more than 13 mm in consideration of the condition that the coating is influenced by the excessive thickness of the composite felt, so that the construction time is shortened, and the construction efficiency is improved; the thinner sound absorbing cotton can also reduce the occupation of the external space of the pipeline, so that the composite felt is more convenient to install on the pipeline.
Further, the sound-absorbing cotton is of a wave-shaped structure, the wave-shaped structure comprises a top end and a concave, and the top end extends outwards; the top end of the sound absorbing cotton is connected with the first bonding layer.
Considering the inconvenient problem of too big installation of whole composite mat thickness, regard as the tie point of being connected with first adhesive linkage with the top of the cotton of above-mentioned inhaling, inhale the equidistant setting of tie point on the cotton of inhaling, the part that does not be equipped with the tie point is reserved the surplus, when cladding the pipeline, inhale the cotton and be located the outer lane, compare in the honeycomb aluminium rete of inner circle, inhale the cladding length of cotton and be greater than the cladding length of honeycomb aluminium rete, should reserve the surplus and be the cladding length that the composite mat thickness is too big promptly, cladding difficult problem has been solved.
The equidistant connection points are beneficial to improving the sound insulation effect of the composite felt. Because the interval of tie point is even, can make the cladding inhale the sound cotton behind the pipeline and compound damping fin between be connected more inseparable, further solved the cladding in-process, inhale the sound cotton length because of being located the outer lane and be too little, lead to inhaling the fold to appear between sound cotton and the compound damping fin, influence sound insulation performance.
Further, the second bonding layer and the aluminum foil layer are of wave-shaped structures, and the amplitude of the second bonding layer is smaller than that of the aluminum foil layer;
The second bonding layer is paved on the sound-absorbing cotton;
The top ends of the aluminum foil layers are connected with the top ends of the second bonding layers in a one-to-one correspondence mode.
Considering that the elasticity of aluminum foil layer is less, and the aluminum foil layer is located the outer lane when cladding, if cladding length is too little, can lead to inhaling and appear the fold between cotton and the aluminum foil layer when cladding, influence sound insulation performance, consequently regard as the tie point of being connected with the second adhesive linkage with the top on above-mentioned aluminum foil layer, the tie point equidistant setting on the aluminum foil layer is regard as the tie point of being connected with the aluminum foil layer, the part that does not be equipped with the tie point is reserved the surplus, when cladding pipeline, this reserved surplus is the cladding length that the outer lane is more, further solved compound felt thickness too big, the difficult problem of cladding.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
The composite damping sheet is formed by alternately arranging a butyl rubber layer and a honeycomb aluminum film layer; the butyl rubber layer is high in elasticity and density, and after the butyl rubber layer coats the outer wall of the pipeline, gaps and holes on the outer wall of the pipeline can be sealed, the transmission of high-frequency noise generated by fluid in the pipeline can be reduced, vibration of the pipeline can be reduced, and low-frequency noise generated by vibration of the pipeline can be reduced; the hexagons used for forming honeycomb shapes in the honeycomb aluminum film layer can effectively disperse and absorb sound transmitted through the pipeline, so that the transmission of high-frequency noise and low-frequency noise is further reduced, and the sound is effectively restrained from being diffused as a barrier is added on the outer wall of the pipeline.
By combining the sound absorbing cotton and the composite damping sheet, the sound insulation effect is further enhanced. The sound absorbing cotton is a material capable of absorbing and consuming sound energy, and noise is absorbed by the sound absorbing cotton after passing through the composite damping sheet, so that the transmission of the noise is greatly reduced. Meanwhile, the sound absorbing cotton and the composite damping sheet are arranged as a whole; compared with the mode of coating the damping fin and the sound-absorbing cotton separately in the prior art, the method reduces the step of coating the sound-absorbing cotton and the composite damping fin, avoids the problem of wrinkles between the composite damping fin and the sound-absorbing cotton in the coating process, and effectively improves the sound insulation performance.
In addition, the damping fin and the sound absorbing cotton are integrally designed, so that the construction efficiency is improved. In the prior art, damping sheets and sound absorbing cotton are required to be coated separately, so that the construction complexity and time cost are increased. The composite felt can be completed by coating only once during construction, so that the construction flow is greatly simplified, the time cost is saved, and the construction efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a front view of the composite mat provided in example 1;
FIG. 2 is a schematic view of the composite mat structures provided in examples 3 and 4;
Fig. 3 is an enlarged view of a in fig. 2.
In the drawings, the reference numerals and corresponding part names:
10. A composite damping fin; 11. a butyl rubber layer; 12. a honeycomb aluminum film layer; 20. sound absorbing cotton; 30. an aluminum foil layer; 41. a first adhesive layer; 42. and a second adhesive layer.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.
Example 1
This example 1 provides a composite mat for use in sound insulation of a pipe, comprising, in combination with fig. 1: the first adhesive layer 41 and the second adhesive layer 42, wherein the first adhesive layer 41 and the second adhesive layer 42 can be made of back glue;
The composite damping sheet 10 includes a butyl rubber layer 11 and a honeycomb aluminum film layer 12 alternately arranged, and the composite damping sheet 10 has four layers, for example: the first butyl rubber layer 11, the first honeycomb aluminum film layer 12, the second butyl rubber layer 11 and the second honeycomb aluminum film layer 12 are sequentially arranged; the first butyl rubber layer 11 of the composite damping fin 10 is used for being bonded with the outer wall of the pipeline;
A sound absorbing cotton 20, wherein one side surface of the sound absorbing cotton 20 is adhered to the second honeycomb aluminum film layer 12 of the composite damping sheet 10 through a first adhesive layer 41; the aluminum foil layer 30 is provided on the other side surface of the sound absorbing cotton 20, and the sound absorbing cotton 20 and the aluminum foil layer 30 are bonded by the second adhesive layer 42.
The composite damping fin 10 is formed by alternately arranging a butyl rubber layer 11 and a honeycomb aluminum film layer 12; the butyl rubber layer 11 has strong elasticity and high density, and after the butyl rubber layer 11 coats the outer wall of the pipeline, the butyl rubber layer 11 not only can seal gaps and holes on the outer wall of the pipeline and reduce the transmission of high-frequency noise generated by fluid in the pipeline, but also can reduce the vibration of the pipeline and reduce the low-frequency noise generated by the vibration of the pipeline; the hexagons used to form the honeycomb in the aluminum honeycomb layer 12 effectively disperse and absorb sound propagating through the pipe, further reducing the propagation of high frequency noise and low frequency noise, as if a barrier were added to the outer wall of the pipe, and effectively suppressing the sound diffusion.
By combining the sound absorbing cotton 20 and the composite damping sheet 10 as described above, the sound insulation effect is further enhanced. The sound absorbing cotton 20 is a material capable of absorbing and consuming sound energy, and noise is absorbed by the sound absorbing cotton 20 after passing through the composite damping sheet 10, thereby greatly reducing the propagation of noise. Meanwhile, the sound absorbing cotton 20 and the composite damping sheet 10 are arranged as a whole; in construction, compared with the mode of coating the damping fin and the sound-absorbing cotton 20 separately in the prior art, the method reduces the step of coating the sound-absorbing cotton 20 and the composite damping fin 10, avoids the problem of wrinkles between the composite damping fin 10 and the sound-absorbing cotton 20 in the coating process, and effectively improves the sound insulation performance.
In addition, the damping fin and the sound absorbing cotton 20 are integrally designed, so that the construction efficiency is improved. In the prior art, it is necessary to separately wrap the damping sheet and the sound absorbing cotton 20, increasing the complexity of construction and the time cost. The composite felt can be completed by coating only once during construction, so that the construction flow is greatly simplified, the time cost is saved, and the construction efficiency is improved.
The aluminum foil layer 30 has excellent ability to reflect sound. When the sound impinges on the aluminum foil layer 30, most of the sound energy is reflected instead of absorbed, which effectively prevents the propagation of the sound. The aluminum foil layer 30 is provided on the sound absorbing cotton 20, as if a barrier reflecting sound is added to the outside of the sound absorbing cotton 20, further enhancing the sound insulation effect.
The aluminum foil layer 30 is light and thin, and the total weight of the composite felt is not obviously increased, so that the construction operation is not greatly influenced, and the convenience of construction is still maintained while the sound insulation effect is enhanced due to the arrangement of the aluminum foil layer 30.
The first adhesive layer 41 adheres the sound absorbing cotton 20 and the composite damping sheet 10 together to prevent relative displacement or separation during use; the second adhesive layer 42 adheres the aluminum foil layer 30 to the sound absorbing cotton 20 together, so that the cooperative work of the aluminum foil layer 30 and the sound absorbing cotton 20 is ensured, the aluminum foil layer 30 reflects noise which is not absorbed by the suction cotton back to the sound absorbing cotton 20 and the composite damping sheet 10, and the sound insulation performance is further improved.
The first adhesive layer 41 and the second adhesive layer 42 have elasticity, and do not affect the normal coating of the composite mat.
Example 2
The thickness of the sound-absorbing cotton 20 is not more than 13 mm based on embodiment 1.
The thinner sound-absorbing cotton 20 can reduce displacement and damage caused by vibration, improve the anti-vibration performance of the composite felt and further reduce low-frequency noise generated by pipeline vibration;
The thickness of the sound-absorbing cotton 20 is set to be not more than 13 mm in consideration of the condition that the coating is influenced by the excessive thickness of the composite felt, so that the construction time is shortened, and the construction efficiency is improved; the thinner sound absorbing cotton 20 can also reduce the occupation of the external space of the pipeline, so that the composite felt is more convenient to install on the pipeline.
Example 3
On the basis of any of the above embodiments, referring to fig. 2 and 3, the sound-absorbing cotton 20 has a wave-shaped structure including a top end and a recess, the top end extends to the outside of the sound-absorbing cotton 20, and the recess extends to the inside of the sound-absorbing cotton 20; the tip of the sound absorbing cotton 20 is connected to the first adhesive layer 41.
Considering the problem of inconvenient installation of whole composite mat thickness too big, regard as the tie point of being connected with first adhesive linkage with the top of inhaling the cotton 20 of sound, the tie point equidistant setting on inhaling the cotton 20 of sound, the part that does not be equipped with the tie point is reserved the surplus, when cladding the pipeline, inhale the cotton 20 of sound and be located the outer lane, compare in the honeycomb aluminium rete 12 of inner circle, inhale the cladding length of cotton 20 of sound and will be greater than the cladding length of honeycomb aluminium rete 12, should reserve the surplus and be the cladding length that is excessive, the problem of composite mat thickness too big, cladding difficulty has been solved.
The equidistant connection points are beneficial to improving the sound insulation effect of the composite felt. Because the interval of tie point is even, can make the cladding be more inseparable in the connection between sound absorbing cotton 20 and the compound damping fin 10 behind the pipeline, further solved the cladding in-process, because of the sound absorbing cotton 20 that is located the outer lane is long too little, lead to appearing the fold between sound absorbing cotton 20 and the compound damping fin 10, influence sound insulation performance.
Example 4
On the basis of any of the above embodiments, referring to fig. 2 and 3, the second adhesive layer 42 and the aluminum foil layer 30 are both in a wave-shaped structure, and the amplitude of the second adhesive layer 42 is smaller than that of the aluminum foil layer 30;
The second adhesive layer 42 is laid on the sound-absorbing cotton 20;
The top ends of the aluminum foil layers 30 are connected with the top ends of the second adhesive layers 42 in a one-to-one correspondence.
Considering that the elasticity of the aluminum foil layer 30 is smaller, and the aluminum foil layer 30 is located at the outermost ring when being coated, if the coating length is too small, wrinkles appear between the sound absorbing cotton 20 and the aluminum foil layer 30 when being coated, and the sound insulation performance is affected, therefore, the top end of the aluminum foil layer 30 is used as a connection point connected with the second bonding layer 42, the top end of the second bonding layer 42 is used as a connection point connected with the aluminum foil layer 30, the connection points on the aluminum foil layer 30 are arranged at equal intervals, the part without the connection point is reserved allowance, and when a pipeline is coated, the reserved allowance is the coating length of the outer ring, so that the problems of overlarge thickness and difficult coating of the composite felt are further solved.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (6)
1. A composite mat for sound insulation of a duct comprising:
The composite damping sheet (10) comprises butyl adhesive layers (11) and honeycomb aluminum film layers (12) which are alternately arranged, wherein the butyl adhesive layers (11) of the composite damping sheet (10) are used for being adhered to the outer wall of a pipeline;
The sound absorbing cotton (20) is fixedly connected with a honeycomb aluminum film layer (12) of the composite damping sheet (10).
2. The composite mat for sound insulation of pipes according to claim 1, wherein a side of the sound absorbing cotton (20) remote from the composite damping sheet (10) is provided with an aluminum foil layer (30).
3. The composite mat for sound insulation of pipes according to claim 2, wherein a first adhesive layer (41) is provided between the sound absorbing cotton (20) and the composite damping sheet (10);
a second bonding layer (42) is arranged between the aluminum foil layer (30) and the sound absorbing cotton (20).
4. The composite mat for sound insulation of pipes according to claim 1, wherein the thickness of the sound absorbing cotton (20) is not more than 13 mm.
5. A composite mat for sound insulation of pipes according to claim 3, characterized in that the sound absorbing cotton (20) is a wave-like structure comprising a top end and a recess;
The top end of the sound absorbing cotton (20) is connected with the first bonding layer (41).
6. The composite mat for sound insulation of pipes according to claim 5, wherein the second adhesive layer (42) and the aluminum foil layer (30) are each of a wave-like structure, and the second adhesive layer (42) has a smaller amplitude than the aluminum foil layer (30);
The second bonding layer (42) is paved on the sound-absorbing cotton (20);
The top ends of the aluminum foil layers (30) are connected with the top ends of the second bonding layers (42) in a one-to-one correspondence mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322803244.0U CN220851084U (en) | 2023-10-19 | 2023-10-19 | Composite felt for sound insulation of pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322803244.0U CN220851084U (en) | 2023-10-19 | 2023-10-19 | Composite felt for sound insulation of pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220851084U true CN220851084U (en) | 2024-04-26 |
Family
ID=90771854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322803244.0U Active CN220851084U (en) | 2023-10-19 | 2023-10-19 | Composite felt for sound insulation of pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220851084U (en) |
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2023
- 2023-10-19 CN CN202322803244.0U patent/CN220851084U/en active Active
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