A composite muffler with replaceable sound absorption module

Abstract

The utility model is suitable for the technical field of muffler, provides a compound muffler of replaceable sound absorption module, including shell, be provided with sliding bar on the sliding bar, sliding connection has sound absorption module on the sliding bar, the bottom of sound absorption module is provided with porous layer board, sound absorption module and porous layer board one end are connected with handle, the bottom of porous layer board is provided with first sound elimination passage, every two groups first sound elimination passage both sides are provided with sound absorption cotton, first sound elimination passage bottom is provided with resistance sound elimination module. This device solves the technical problem that the existing muffler structure is not detachable, maintenance and replacement are difficult, and sound absorption module cannot adapt to different frequency spectrum requirements, achieves the quick dismounting and flexible replacement of sound absorption module, thereby adapting to the effect of different frequency spectrum requirements and different occasions.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, and more specifically, to a composite silencer with a replaceable sound-absorbing module. Background Technology

[0002] A silencer is an acoustic device used to suppress noise generated by aerodynamic equipment (such as fans, air compressors, and exhaust systems) during operation. It is widely used in industry, construction, and transportation. Common silencer types include resistive silencers, reactive silencers, and composite silencers. Resistive structures primarily rely on sound-absorbing materials (such as glass wool and mineral wool) to convert sound energy into heat for dissipation, making them suitable for controlling mid-to-high frequency noise. Reactive structures, on the other hand, rely on reflection and interference mechanisms such as cavities and throttling channels to suppress low-frequency sound waves. With the increasing complexity of operating environments and the widening of frequency spectrum distributions, composite structures are gradually becoming the mainstream, achieving wider frequency bands and higher efficiency noise reduction by integrating multiple acoustic mechanisms.

[0003] Despite significant advancements in sound absorption performance, existing composite silencers still suffer from several shortcomings: First, the sound-absorbing structure is typically a welded or enclosed design, making modular replacement impossible and resulting in difficult and time-consuming maintenance. Second, the lack of effective limiting and buffering structures makes them prone to structural loosening and performance degradation under high wind speeds and pulsating airflow. Third, the silencer structure lacks versatility for different acoustic requirements and operating environments, hindering flexible replacement and adaptation of sound-absorbing modules, thus limiting the equipment's adaptability and cost-effectiveness. For example, a silencer device disclosed in CN204126706U employs a multi-layered structure and possesses a certain broadband sound absorption capability, but it still lacks a replaceable modular structure and an effective sound-absorbing module positioning and limiting device, failing to meet the demands of industrial scenarios requiring high maintenance efficiency and multi-functionality.

[0004] Therefore, based on the above problems, this utility model proposes a composite silencer with a replaceable sound-absorbing module. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a composite silencer with a replaceable sound-absorbing module.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A composite silencer with a replaceable sound-absorbing module includes a housing, a sliding bar on which a sound-absorbing module is slidably connected, a porous layer plate at the bottom of the sound-absorbing module, a handle connected to one end of the sound-absorbing module and the porous layer plate, a first silencing channel at the bottom of the porous layer plate, sound-absorbing cotton on both sides of every two sets of the first silencing channels, and a resistive silencing module at the bottom of the first silencing channel.

[0008] The present invention is further configured such that: a rubber strip is longitudinally arranged at the end of the sliding bar away from the handle, and the rubber strip abuts against one end of the sound-absorbing module.

[0009] The present invention is further configured such that: an air outlet is provided at the top of the outer shell and an air inlet is provided at the bottom.

[0010] The present invention is further configured such that the resistive noise reduction module has a double-layer structure on both sides.

[0011] The present invention is further configured such that: a plurality of sound-absorbing filler layers are arranged horizontally inside the resistive silencing module, and sound-absorbing cavity sections are arranged at intervals in the sound-absorbing filler layers.

[0012] The present invention is further configured such that the sound-absorbing filler layer is wavy.

[0013] The present invention is further configured such that: the first silencing channel is a conical structure with an open top, and a plurality of through holes are provided around the first silencing channel.

[0014] In summary, this application includes at least one of the following beneficial technical effects:

[0015] 1. By setting up a sliding bar and slide groove structure, the sound-absorbing module can be smoothly guided and slidably installed. Combined with the handle design, it not only facilitates users to quickly plug and unplug and replace the module, but also ensures that the module is stably positioned and does not loosen during operation, thereby improving the maintenance efficiency and operational reliability of the equipment.

[0016] 2. Through the coordinated design of resistive absorption modules with porous layers, sound-absorbing cotton, the first anechoic channel, and sound-absorbing cavities, efficient attenuation of mid-to-high frequency and mid-to-low frequency noise is achieved, adapting to various complex acoustic environments. Meanwhile, the conical channel with a flanged turbulence structure in the second embodiment further enhances the reflection path and turbulence diffusion capability, effectively improving anechoic stability in high airflow environments.

[0017] 3. This utility model, through the design of replaceable sound-absorbing modules, allows different types of silencers (such as resistive and turbulence-reflective types) to be flexibly replaced according to the usage scenario, thereby significantly improving the applicability of the silencer and meeting the acoustic control needs of multiple industries, multiple frequency bands and multiple airflow conditions. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a composite silencer with a replaceable sound-absorbing module according to the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the first noise reduction channel in this utility model.

[0020] Figure 3 This is a schematic diagram of a second embodiment of the composite silencer with a replaceable sound-absorbing module according to the present invention.

[0021] Figure 4 This is a front view of the second noise reduction channel in this utility model.

[0022] Figure 5 for Figure 4 A sectional view taken along section line AA.

[0023] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Sliding strip; 12. Rubber strip; 2. Handle; 3. Sound-absorbing module; 4. Porous layer; 6. First sound-absorbing channel; 61. Sound-absorbing cotton; 62. Through hole; 7. Resistive sound-absorbing module; 71. Sound-absorbing cavity section; 72. Sound-absorbing filler layer; 8. Second sound-absorbing channel; 81. Filling layer; 82. Flange. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] Example 1, please refer to Figures 1 to 5 This invention provides a composite silencer with a replaceable sound-absorbing module. This silencer aims to improve noise control efficiency in industrial or built environments and features convenient structural replacement and excellent sound absorption.

[0027] Specifically, the composite silencer includes a housing 1, which is a hollow structure. The top and bottom of the housing 1 are respectively provided with an air outlet and an air inlet. The shape of the housing 1 can be customized according to the actual installation environment requirements; for example, it can be made into a cylindrical, square, or other polygonal structure to meet the connection requirements of different equipment pipelines or exhaust systems. A sliding strip 11 is arranged along the length of the inner wall of the housing 1. The sliding strip 11 is a strip-shaped guide component, mainly used to provide a stable module installation trajectory and guide the sound-absorbing module to slide along the axial direction of the silencer.

[0028] The silencer contains a replaceable sound-absorbing module 3. The top of this module 3 has a groove structure that matches the shape and size of the sliding bar 11, forming a tight-fitting sliding engagement with the bar 11. This structure effectively prevents the sound-absorbing module from shaking, shifting, or jamming during insertion, removal, or operation, ensuring smooth and stable sliding movement and improving module replacement efficiency and reliability.

[0029] To facilitate manual operation and replacement, a handle 2 is provided at one end of the sound-absorbing module 3. Users can easily insert and remove the sound-absorbing module 3 by directly using the handle 2 along the direction of the sliding bar 11. The operation is simple and quick, without the need to disassemble the outer shell or use additional tools, which significantly improves maintenance efficiency.

[0030] At the bottom of the sound-absorbing module 3, a porous layer plate 4 is fixedly connected, and the two together form an independent resistive absorption module. To further optimize positioning and impact resistance during replacement, a rubber strip 13 is provided on the outer shell 1 near the end of the module. This rubber strip 13 is used to absorb the impact force during the insertion of the module. When the module is fully pushed into place, its end will press against the rubber strip 13, effectively preventing damage to the end of the module, and also serving as a limiting and buffering function.

[0031] Multiple first silencing channels 6 are uniformly formed at the bottom of the porous plate 4. These channels are conical structures with open tops. Their conical geometry helps to diffuse incident sound waves and form nonlinear propagation paths, thereby enhancing the ability to dissipate sound energy.

[0032] To further enhance the attenuation performance for mid-to-high frequency noise, the outer surface of the first anechoic channel 6 is surrounded by multiple through holes 62. When sound waves propagate in the channel, they can partially penetrate the through holes 62 and enter the porous structure region outside the channel. The porous structure refracts, scatters, and interferes with the sound waves multiple times, thereby achieving stronger sound energy dissipation and significantly improving the overall sound absorption effect.

[0033] High-performance sound-absorbing cotton 61 is uniformly filled between multiple first anechoic channels 6. This sound-absorbing cotton is made of resistive material with good acoustic properties, which not only has excellent absorption effect on mid-to-high frequency noise, but also its soft and compressible structural characteristics allow it to fit tightly into the channel gaps, enhancing local sealing and sound absorption consistency, and effectively improving the acoustic adaptability of the entire module.

[0034] In addition, to further expand the noise frequency band coverage, an independent resistive noise reduction module 7 is set inside the sound absorption module. This module has several sets of sound-absorbing filler layers 72 arranged horizontally inside, with a sound-absorbing cavity section 71 between every two sets of filler layers. This cavity section 71 forms a resonant cavity structure, effectively absorbing mid-to-low frequency noise components through the standing wave and interference effect generated by sound waves within the cavity.

[0035] The sound-absorbing filler layer 72 is preferably made of corrugated fiber material. Its corrugated geometry can significantly increase the sound-absorbing surface area per unit volume and extend the propagation path of sound waves within the filler, thereby enhancing the sound energy reflection and dissipation effect. This design effectively improves sound absorption performance while maintaining the lightweight and replaceability of the modular structure, facilitating its promotion and maintenance in practical applications.

[0036] Example 2: In some special application scenarios, the structure of the resistive absorption module (composed of the sound-absorbing module 3 and its bottom porous plate 4) is difficult to meet the noise reduction requirements under specific frequency or airflow conditions. Therefore, it can be replaced with other sound-absorbing module structures, such as... Figure 3 As shown.

[0037] In this embodiment, the resistive absorption module consisting of the sound-absorbing module 3 and the porous layer plate 4 is replaced with another type of flow-guided sound-absorbing module. The top of the flow-guided sound-absorbing module is also provided with a sliding groove that matches the shape of the sliding bar 11, so as to ensure that it can be guided and installed along the sliding bar 11.

[0038] The flow-guided sound-absorbing module has several sets of second silencing channels 8 inside, with a filling layer 81 between each set of second silencing channels 8 for absorbing and dispersing sound waves. The second silencing channel 8 is also designed as a conical structure with an open top to enhance the sound absorption effect. Unlike the first silencing channel 6, the inner surface of the second silencing channel 8 is surrounded by multiple flanges 82.

[0039] See Figure 4 and Figure 5The flanges 82 are evenly distributed along the channel axis, forming multi-level reflection and diffusion cavities, which can effectively increase the path length and number of reflections of sound waves inside the channel, thereby improving the energy dissipation efficiency of sound waves. The flanges 82 can also have a turbulence-inducing effect, enhancing turbulent diffusion when high airflow passes through, further enhancing the reflection path and turbulent diffusion capability, and effectively improving the noise reduction stability in high airflow environments.

[0040] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

Claims

1. A composite silencer with replaceable sound-absorbing modules, characterized in that: Includes a housing (1), a sliding bar (11) is provided on the sliding bar (11), a sound-absorbing module (3) is slidably connected on the sliding bar (11), a porous layer plate (4) is provided at the bottom of the sound-absorbing module (3), a handle (2) is connected to one end of the sound-absorbing module (3) and the porous layer plate (4), a first sound-absorbing channel (6) is provided at the bottom of the porous layer plate (4), sound-absorbing cotton (61) is provided on both sides of every two sets of the first sound-absorbing channels (6), and a resistive sound-absorbing module (7) is provided at the bottom of the first sound-absorbing channel (6).

2. The composite silencer with a replaceable sound-absorbing module according to claim 1, characterized in that: A rubber strip (12) is longitudinally arranged at the end of the sliding strip (11) away from the handle (2), and the rubber strip (12) abuts against one end of the sound-absorbing module (3).

3. The composite silencer with a replaceable sound-absorbing module according to claim 1, characterized in that: The outer casing (1) has an air outlet at the top and an air inlet at the bottom.

4. A composite silencer with a replaceable sound-absorbing module according to claim 3, characterized in that: The resistive noise reduction module (7) has a double-layer structure on both sides.

5. A composite silencer with a replaceable sound-absorbing module according to claim 1, characterized in that: The resistive silencing module (7) has several sets of sound-absorbing filler layers (72) arranged in the horizontal direction inside, and sound-absorbing cavity sections (71) are arranged at intervals in the sound-absorbing filler layers (72).

6. A composite silencer with a replaceable sound-absorbing module according to claim 5, characterized in that: The sound-absorbing filler layer (72) is configured to be wavy.

7. A composite silencer with a replaceable sound-absorbing module according to claim 1, characterized in that: The first silencing channel (6) is configured as a conical structure with an open top, and a number of through holes (62) are provided around the first silencing channel (6).

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