CN223270044U - Broadband resistant muffler, engine exhaust system and general engine - Google Patents
Broadband resistant muffler, engine exhaust system and general engineInfo
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- CN223270044U CN223270044U CN202422950541.2U CN202422950541U CN223270044U CN 223270044 U CN223270044 U CN 223270044U CN 202422950541 U CN202422950541 U CN 202422950541U CN 223270044 U CN223270044 U CN 223270044U
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Abstract
本申请公开了一种宽频抗性消声器、发动机排气系统及通机发动机，宽频抗性消声器包括具有扩张腔室的消声器外壳和设置于所述消声器外壳内的赫姆霍兹共振消声件，所述消声器外壳内沿径向设置有一个内隔板，所述内隔板将所述扩张腔室分隔成第一腔室和第二腔室，所述内隔板的中部开设有安装通孔，所述赫姆霍兹共振消声件安装在所述安装通孔内，所述赫姆霍兹共振消声件的两端分别嵌入到所述第一腔室和所述第二腔室中并将所述第一腔室和第二腔室连通。本申请能够在保证消声器安装空间不增大且不设置吸音棉的前提下，有效扩大抗性消声器的消声频率范围。
The present application discloses a broadband resistant muffler, an engine exhaust system, and a general-purpose engine. The broadband resistant muffler includes a muffler housing having an expansion chamber and a Helmholtz resonance muffler disposed within the muffler housing. The muffler housing includes a radially disposed inner baffle that divides the expansion chamber into a first chamber and a second chamber. The inner baffle has a mounting hole in the middle, and the Helmholtz resonance muffler is mounted within the mounting hole. The two ends of the Helmholtz resonance muffler are respectively embedded in the first chamber and the second chamber, connecting the first chamber and the second chamber. The present application can effectively expand the muffler frequency range without increasing the muffler installation space and without installing sound-absorbing cotton.
Description
Technical Field
The application belongs to the technical field of silencers, and particularly relates to a broadband resistant silencer, an engine exhaust system and a general engine.
Background
The modern society and the scientific technology develop rapidly, and various inventions are discovered to be layered endlessly, so that the living standard of people is continuously improved. People continuously enjoy modern substance civilization brought by high-tech technology, but have to endure the environmental pollution brought by the substance civilization. Among these pollution, noise pollution is the most serious and the most widely affected, and if noise pollution is light, normal production and life of human beings are affected and if health of human beings is seriously jeopardized.
Aiming at the general-purpose muffler, on the premise that the installation space of the muffler is not increased and sound-absorbing cotton is not arranged, in order to find a method capable of greatly improving the sound-absorbing quantity of the muffler and improving the frequency characteristic of the muffler, the muffler can better eliminate the noise of an air inlet system, and the muffler internal structure with excellent design performance is an effective measure for reducing the noise of the air inlet and outlet system.
The resistive muffler has a good performance in a low-and-medium frequency range (2000 Hz or less), and is therefore often used for a general purpose muffler. As shown in fig. 1, the resistive muffler is composed of various muffler units such as an expansion chamber and a resonance chamber, which are internally formed by members such as pipes and partition plates, and is configured to reduce acoustic waves by reflection, interference, and the like by structural changes such as abrupt changes in cross section or connection of resonance chambers, which are encountered during acoustic wave transmission. The existing resistant muffler has poor performance in reducing high-frequency noise, and if the high-frequency noise needs to be reduced, the high-frequency noise can be generally reduced only by adding sound-absorbing cotton in the resistant muffler.
Therefore, how to effectively expand the noise elimination frequency range of the resistant muffler without increasing the installation space of the muffler and arranging sound absorbing cotton is a problem to be solved in the field at present.
Disclosure of utility model
Aiming at the defects in the prior art, the application aims to provide a broadband resistant muffler, an engine exhaust system and a general engine, which can effectively enlarge the noise elimination frequency range of the resistant muffler on the premise of ensuring that the installation space of the muffler is not increased and sound-absorbing cotton is not arranged.
In order to achieve the above object, the present application provides the following solutions:
According to a first aspect of the present application, there is provided a broadband resistant muffler comprising a muffler housing having an expansion chamber and a helmholtz resonance muffler member disposed within the muffler housing, wherein,
An inner partition plate is arranged in the silencer shell along the radial direction, the inner partition plate divides the expansion chamber into a first chamber and a second chamber, an installation through hole is formed in the middle of the inner partition plate, the Helmholtz resonance silencing piece is installed in the installation through hole, and two ends of the Helmholtz resonance silencing piece are respectively embedded into the first chamber and the second chamber and are communicated with the first chamber and the second chamber.
Preferably, the helmholtz resonance muffler includes a cylindrical inner pipe and a trumpet-shaped vent pipe for communicating the first chamber and the second chamber;
The air inlet end of the inner tube is provided with a first baffle, the air outlet end of the inner tube is provided with a second baffle, the first baffle and the second baffle are in sealing connection with the inner tube, the first baffle, the inner tube and the second baffle enclose a resonance cavity, the vent tube penetrates through the first baffle and the second baffle, the outer wall of the vent tube is in sealing connection with the first baffle and the second baffle,
The caliber of the air inlet end of the vent pipe is larger than that of the air outlet end of the vent pipe, a first vent hole is formed in the pipe wall of the part of the vent pipe, which is positioned in the resonant cavity, and the first vent hole is used for communicating the resonant cavity with an internal airflow channel of the vent pipe.
Preferably, the first ventilation holes are provided in plurality, and the first ventilation holes are uniformly distributed on the pipe wall of the ventilation pipe.
Preferably, the air inlet end of the vent pipe protrudes towards the air inlet side relative to the first baffle, and the air outlet end of the vent pipe protrudes towards the air outlet side relative to the second baffle.
Preferably, the helmholtz resonance muffler further includes a muffler baffle, the muffler baffle is disposed at an air inlet end of the vent pipe, and a second vent hole is formed in the muffler baffle and is used for communicating the first chamber with an internal airflow channel of the vent pipe.
Preferably, the first ventilation holes are multiple, and the second ventilation holes are uniformly distributed on the silencing baffle.
Preferably, the Helmholtz resonance muffler further comprises an intermediate baffle plate, the intermediate baffle plate is arranged between the first baffle plate and the second baffle plate, the outer edge of the intermediate baffle plate is in sealing connection with the inner wall of the inner tube, the vent pipe also penetrates through the intermediate baffle plate, the outer wall of the vent pipe is in sealing connection with the intermediate baffle plate,
The middle baffle separates the resonance cavity into a first resonance chamber and a second resonance chamber, and the first resonance chamber and the second resonance chamber are communicated with an internal airflow channel of the vent pipe through the first vent hole.
Preferably, the muffler shell comprises an outer pipe, an air inlet connecting pipe, an air outlet connecting pipe, a first outer sealing plate and a second outer sealing plate, wherein the pipe diameters of the air inlet connecting pipe and the air outlet connecting pipe are the same and are smaller than those of the outer pipe, one end of the outer pipe is connected with the air inlet connecting pipe through the first outer sealing plate, the other end of the outer pipe is connected with the air outlet connecting pipe through the second outer sealing plate, and the first outer sealing plate, the outer pipe and the second outer sealing plate enclose an expansion cavity.
According to a second aspect of the present application there is provided an engine exhaust system comprising a wide band resistant muffler as defined in any one of the first aspects above.
According to a third aspect of the present application, there is provided a general-purpose engine comprising the engine exhaust system according to the second aspect.
Due to the adoption of the technical scheme, the application has the following beneficial effects:
According to the application, on the basis of the prior art, the inner partition plate is arranged in the silencer shell with the expansion cavity along the radial direction, the expansion cavity is divided into the first cavity and the second cavity by the inner partition plate, the middle part of the inner partition plate is provided with the mounting through hole, the Helmholtz resonance silencing piece is mounted in the mounting through hole, and two ends of the Helmholtz resonance silencing piece are respectively embedded into the first cavity and the second cavity and are communicated with the first cavity and the second cavity, so that the silencing frequency range of the resistance silencer can be effectively enlarged on the premise that the installation space of the silencer is not increased and sound absorbing cotton is not arranged.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic cross-sectional view of a conventional general purpose muffler;
FIG. 2 is a schematic perspective view of a broadband resistant muffler according to an embodiment of the present application;
FIG. 3 is a front view of FIG. 2;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a perspective cross-sectional view of FIG. 2;
FIG. 6 is a graph comparing the outlet response curves of the wide-band resistive muffler of the embodiment of the present application shown in FIG. 5 with the conventional general purpose muffler shown in FIG. 1;
Fig. 7 is a graph showing a comparison of a transmission loss characteristic curve of the broadband resistive muffler according to the embodiment of the present application shown in fig. 5 and the conventional general-purpose muffler shown in fig. 1.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 2 to 5, the embodiment of the present application provides a broadband resistant muffler including a muffler housing 2 having an expansion chamber 1 and a helmholtz resonance muffler 3 provided in the muffler housing 2, wherein,
An inner partition plate 4 is arranged in the silencer shell 2 along the radial direction, the inner partition plate 4 divides the expansion chamber 1 into a first chamber 11 and a second chamber 12, a mounting through hole 41 is formed in the middle of the inner partition plate 4, the Helmholtz resonance silencing piece 3 is mounted in the mounting through hole 41, and two ends of the Helmholtz resonance silencing piece 3 are respectively embedded into the first chamber 11 and the second chamber 12 and communicated with the first chamber 11 and the second chamber 12.
The broadband resistant muffler of the embodiment of the application has the advantages that the inner partition plate 4 is arranged in the muffler shell 2 with the expansion chamber 1 along the radial direction, the expansion chamber 1 is divided into the first chamber 11 and the second chamber 12 by the inner partition plate 4, the middle part of the inner partition plate 4 is provided with the mounting through hole 41, the Helmholtz resonance muffler 3 is mounted in the mounting through hole 41, and the two ends of the Helmholtz resonance muffler 3 are respectively embedded into the first chamber 11 and the second chamber 12 and communicated with the first chamber 11 and the second chamber 12, so that the muffling frequency range of the resistant muffler can be effectively enlarged on the premise that the mounting space of the muffler is not increased and sound absorbing cotton is not arranged.
In one embodiment, the helmholtz resonance muffler 3 includes a cylindrical inner pipe 31 and a horn-shaped vent pipe 32, and the vent pipe 32 is used to communicate the first chamber 11 and the second chamber 12;
The air inlet end of the inner tube 31 is provided with a first baffle 33, the air outlet end of the inner tube 31 is provided with a second baffle 34, the first baffle 33 and the second baffle 34 are in sealing connection with the inner tube 31, the first baffle 33, the inner tube 31 and the second baffle 34 enclose a resonance chamber 35, the vent tube 32 penetrates through the first baffle 33 and the second baffle 34, the outer wall of the vent tube 32 is in sealing connection with the first baffle 33 and the second baffle 34,
The caliber of the air inlet end of the vent pipe 32 is larger than that of the air outlet end of the vent pipe, a first vent hole 321 is formed in the pipe wall of the part of the vent pipe 32 located in the resonant cavity 35, and the first vent hole 321 is used for communicating the resonant cavity 35 with an internal airflow channel of the vent pipe 32.
The helmholtz resonance muffler 3 in this embodiment is provided with the cylindrical inner pipe 31, and the first baffle 33 and the second baffle 34 are disposed at two ends of the inner pipe 31, so that the first baffle 33, the inner pipe 31 and the second baffle 34 enclose the resonance chamber 35, meanwhile, the horn-shaped ventilation pipe 32 is disposed inside the inner pipe 31, and the caliber of the air inlet end of the ventilation pipe 32 is greater than that of the air outlet end of the ventilation pipe, the pipe wall of the part of the ventilation pipe 32 located in the resonance chamber 35 is provided with the first vent 321, and the first vent 321 is communicated with the internal airflow channel of the resonance chamber 35 and the ventilation pipe 32, so that the airflow in the first chamber 11 enters the resonance chamber 35 from the air inlet end of the ventilation pipe 32, then enters the ventilation pipe 32 through the first vent 321 after being reflected, and is discharged to the second chamber 12 from the air outlet end of the ventilation pipe 32 through the first vent 321, and the sound reaches the resonance frequency in the resonance chamber 35, thereby realizing the conversion from sound energy to kinetic energy, thereby realizing the noise elimination effect based on helmholtz resonance, proving that the sound elimination structure can effectively increase the width of the muffler, and the noise elimination effect can only be reduced in a high frequency band, and the traditional noise elimination effect can only be achieved.
It should be noted that, the inlet flow rate and the impedance can be adjusted by controlling the air passing rate and the aperture size and the number of the first ventilation holes 321, and in this embodiment, the air passing rate on the ventilation pipe 32 and the aperture size of the first ventilation holes 321 can be set according to the frequency range of the noise to be eliminated through experiments.
In one embodiment, the first ventilation holes 321 are provided in a plurality, and the plurality of first ventilation holes 321 are uniformly distributed on the pipe wall of the ventilation pipe 32. This arrangement allows the airflow to spread evenly as it passes from the vent tube 32 into the resonant cavity 35, thereby better reducing noise loudness.
In one embodiment, the air inlet end of the air pipe 32 is provided protruding to the air inlet side with respect to the first baffle 33, and the air outlet end of the air pipe 32 is provided protruding to the air outlet side with respect to the second baffle 34.
In one embodiment, the helmholtz resonance muffler 3 further includes a muffler baffle 36, where the muffler baffle 36 is disposed at the air inlet end of the breather pipe 32, and the muffler baffle 36 is provided with a second air vent 361, where the second air vent 361 is used to communicate the first chamber 11 with the internal airflow channel of the breather pipe 32. By providing the muffler baffle 36 at the air inlet end of the vent pipe 32 and providing the second vent hole 361 on the muffler baffle 36, when the air flow enters the vent pipe 32 from the first chamber 11 through the air inlet end of the vent pipe 32, the air flow resistance can be increased by the muffler baffle 36, so as to improve the muffler effect.
It should be noted that, the inlet flow rate and the impedance can be adjusted by controlling the air passing rate and the aperture size and the number of the second ventilation holes 361, and the air passing rate on the ventilation pipe 32 and the aperture size of the second ventilation holes 361 in this embodiment can be set according to the frequency range of the noise to be eliminated through experiments.
In one embodiment, the first ventilation holes 321 are provided in plurality, and the plurality of second ventilation holes 361 are uniformly distributed on the muffler baffle 36. This arrangement allows the airflow to spread evenly as it passes from the vent tube 32 into the resonant cavity 35, thereby better reducing noise loudness.
In one embodiment, the Helmholtz resonance muffler 3 further includes an intermediate baffle 37, the intermediate baffle 37 is disposed between the first baffle 33 and the second baffle 34, an outer edge of the intermediate baffle 37 is in sealing connection with an inner wall of the inner tube 31, the vent tube 32 further penetrates the intermediate baffle 37, and an outer wall of the vent tube 32 is in sealing connection with the intermediate baffle 37,
The intermediate baffle 37 divides the resonant chamber 35 into a first resonant chamber 351 and a second resonant chamber 352, each of the first resonant chamber 351 and the second resonant chamber 352 communicating with the internal airflow passage of the breather pipe 32 through the first vent 321.
In the present embodiment, the resonance chamber 35 is divided into two resonance chambers by the intermediate baffle 37, and the number of resonance chambers is increased, so that the sound damping frequency and the sound damping amount can be increased to some extent.
Since the frequency of the noise cancellation and the amount of the noise cancellation can be adjusted by controlling the number of the resonance chambers, the number of the resonance chambers can be set by experiments according to the frequency range of the noise to be eliminated.
In one embodiment, the muffler shell 2 includes an outer tube 21, an inlet connection tube 22, an outlet connection tube 23, a first outer sealing plate 24 and a second outer sealing plate 25, the inlet connection tube 22 and the outlet connection tube 23 have the same tube diameter and are smaller than the tube diameter of the outer tube 21, one end of the outer tube 21 is connected with the inlet connection tube 22 through the first outer sealing plate 24, and the other end of the outer tube 21 is connected with the outlet connection tube 23 through the second outer sealing plate 25, and the first outer sealing plate 24, the outer tube 21 and the second outer sealing plate 25 enclose the expansion chamber 1.
As shown in fig. 6 to 7, wherein fig. 6 is a graph comparing the outlet response curves of the wide-band resistant muffler of the embodiment of the present application shown in fig. 5 and the conventional general-purpose muffler shown in fig. 1, and fig. 7 is a graph comparing the transmission loss curves of the wide-band resistant muffler of the embodiment of the present application shown in fig. 5 and the conventional general-purpose muffler shown in fig. 1.
By comparing the blue curve (the outlet response characteristic curve of the existing general-purpose muffler shown in fig. 1) with the orange curve (the outlet response characteristic curve of the broadband resistant muffler in the embodiment of the application shown in fig. 5) in fig. 6, the broadband resistant muffler in the embodiment of the application increases the silencing frequency width interval, has better silencing effect in both low frequency band and high frequency band, effectively reduces the silencing effect of the outlet response of the low frequency band and the high frequency band, particularly the high frequency band, breaks through the technical bottleneck that the traditional muffler can only be realized by adding sound absorbing cotton in the resistant muffler, and can effectively reduce the cost investment of the muffler.
As can be seen by comparing the blue curve (the transmission loss characteristic curve of the conventional general-purpose muffler shown in fig. 1) with the orange curve (the transmission loss characteristic curve of the broadband resistant muffler in the embodiment of the present application shown in fig. 5) in fig. 7, the transmission loss of the broadband resistant muffler in the embodiment of the present application is more balanced and stable, so that it is illustrated that the broadband resistant muffler in the embodiment of the present application can effectively reduce the loudness and sharpness of the muffler and improve the sound quality of the muffler.
The embodiment of the application also provides an engine exhaust system, which comprises the broadband resistant muffler in any embodiment.
Since the engine exhaust system includes the wide-band resistant muffler in any of the above embodiments, the engine exhaust system has the same technical effects as the wide-band resistant muffler in each of the above embodiments. The specific structure of the engine exhaust system belongs to the prior art and is not described in detail herein.
The embodiment of the application also provides a general engine, which comprises the engine exhaust system in the embodiment.
Since the engine exhaust system includes the engine exhaust system in the above embodiment, the general-purpose engine has the same technical effects as the engine exhaust system in the above embodiment. The specific structure of the general engine belongs to the prior art and is not described in detail here.
Those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
It should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit the technical solution of the present application, and although the detailed description of the present application is given with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application, and all the modifications or substitutions are included in the scope of the claims and the specification of the present application.
Claims (10)
1. A broadband resistant muffler is characterized by comprising a muffler housing having an expansion chamber and a Helmholtz resonance muffler disposed within the muffler housing, wherein,
An inner partition plate is arranged in the silencer shell along the radial direction, the inner partition plate divides the expansion chamber into a first chamber and a second chamber, an installation through hole is formed in the middle of the inner partition plate, the Helmholtz resonance silencing piece is installed in the installation through hole, and two ends of the Helmholtz resonance silencing piece are respectively embedded into the first chamber and the second chamber and are communicated with the first chamber and the second chamber.
2. The broadband resistant muffler of claim 1, wherein the helmholtz resonance muffler includes a cylindrical inner tube and a trumpet-shaped vent tube for communicating the first and second chambers;
The air inlet end of the inner tube is provided with a first baffle, the air outlet end of the inner tube is provided with a second baffle, the first baffle and the second baffle are in sealing connection with the inner tube, the first baffle, the inner tube and the second baffle enclose a resonance cavity, the vent tube penetrates through the first baffle and the second baffle, the outer wall of the vent tube is in sealing connection with the first baffle and the second baffle,
The caliber of the air inlet end of the vent pipe is larger than that of the air outlet end of the vent pipe, a first vent hole is formed in the pipe wall of the part of the vent pipe, which is positioned in the resonant cavity, and the first vent hole is used for communicating the resonant cavity with an internal airflow channel of the vent pipe.
3. The broadband resistant muffler of claim 2, wherein the first vent holes are provided in a plurality, and the plurality of first vent holes are uniformly distributed on the wall of the vent pipe.
4. The wide-band resistant muffler of claim 2 wherein the inlet end of the vent pipe is convex to the inlet side with respect to the first baffle and the outlet end of the vent pipe is convex to the outlet side with respect to the second baffle.
5. The broadband resistant muffler of claim 4, wherein the helmholtz resonance muffler further comprises a muffler baffle disposed at the inlet end of the vent pipe, the muffler baffle having a second vent opening therein for communicating the first chamber with the internal airflow passage of the vent pipe.
6. The broadband resistant muffler of claim 5, wherein the first vent holes are provided in plurality and the second vent holes are uniformly distributed on the muffler baffle.
7. The wide-band resistant muffler of claim 2 wherein the Helmholtz resonance muffler further comprises an intermediate baffle disposed between the first and second baffles, an outer edge of the intermediate baffle being sealingly connected to an inner wall of the inner tube, the vent pipe further passing through the intermediate baffle, and an outer wall of the vent pipe being sealingly connected to the intermediate baffle,
The middle baffle separates the resonance cavity into a first resonance chamber and a second resonance chamber, and the first resonance chamber and the second resonance chamber are communicated with an internal airflow channel of the vent pipe through the first vent hole.
8. The broadband resistant muffler according to any one of claims 1 to 7, wherein the muffler housing includes an outer tube, an inlet connection tube, an outlet connection tube, a first outer sealing plate and a second outer sealing plate, the inlet connection tube and the outlet connection tube having the same tube diameter and both being smaller than the tube diameter of the outer tube, one end of the outer tube being connected to the inlet connection tube through the first outer sealing plate, the other end of the outer tube being connected to the outlet connection tube through the second outer sealing plate, the first outer sealing plate, the outer tube and the second outer sealing plate enclosing the expansion chamber.
9. An engine exhaust system comprising the wide band resistant muffler of any one of claims 1-8.
10. A general purpose engine comprising the engine exhaust system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422950541.2U CN223270044U (en) | 2024-12-02 | 2024-12-02 | Broadband resistant muffler, engine exhaust system and general engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422950541.2U CN223270044U (en) | 2024-12-02 | 2024-12-02 | Broadband resistant muffler, engine exhaust system and general engine |
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| Publication Number | Publication Date |
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| CN223270044U true CN223270044U (en) | 2025-08-26 |
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| CN202422950541.2U Active CN223270044U (en) | 2024-12-02 | 2024-12-02 | Broadband resistant muffler, engine exhaust system and general engine |
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