Automobile silencer structure

Abstract

The invention provides an automobile silencer structure, and belongs to the technical field of silencers, the automobile silencer structure comprises a silencer main body, the silencer main body is composed of a barrel, an exhaust pipe and a tail pipe, and the automobile silencer structure further comprises a buffer cleaning assembly and a vibration assembly; by means of the static structural design of series connection of multiple cavities and a crossed reverse airflow path, sound energy can be fully consumed, and the noise reduction effect is better than that of a traditional structure; a dynamic mechanism introduced by the vibration assembly actively breaks a stable sound field in the silencer through periodically generated mechanical vibration and pulse airflow, and formation of harmful standing waves and resonance under specific frequency is effectively prevented, so that the problem of low-frequency impact abnormal sound generated when working conditions such as rapid acceleration suddenly change is solved; two sets of systems, namely a buffer cleaning assembly for rotary scrubbing and a vibration assembly for high-frequency shake-off, are integrated, a self-cleaning network covering the first air outlet pipe, the connecting pipe and the second air outlet pipe is formed, and the problems that due to carbon deposition and blockage, the engine power is reduced, and the noise elimination performance is degraded are completely eradicated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of muffler, in particular to a vehicle muffler structure. BACKGROUND

[0002] The vehicle muffler is an important part of the exhaust system, and its performance directly affects the noise level of the vehicle, the engine back pressure and the fuel economy. The traditional resistive muffler mainly realizes the reflection, interference and cancellation of sound waves through the pipeline, baffle and multi-chamber structure, so as to achieve the purpose of noise reduction.

[0003] However, in the actual use process, such muffler still has the following problems, first, the engine exhaust contains carbon particles, oil mist and water and other substances which cannot be completely burned, when flowing through the inside of the muffler, especially through the perforated pipe, these substances are easy to deposit on the perforated edge, the inner wall of the pipeline and the corner of the chamber, forming carbon and oil sludge, which not only significantly increases the exhaust back pressure, reduces the engine power output and increases the fuel consumption, but also changes the acoustic characteristics of the muffler, intensifies the low-frequency booming sound, and the noise reduction effect decreases obviously, in order to remove these deposits, the muffler usually needs to be completely disassembled from the vehicle for high-temperature baking or chemical cleaning, the maintenance process is complicated and the cost is high; in addition, the traditional multi-chamber muffler has limited noise reduction effect on specific frequency, especially low frequency noise, its internal structure is fixed and cannot adapt to the wideband and high energy exhaust noise generated by the engine under different working conditions (such as sudden acceleration and high load), which is easy to produce perceptible noise impact or abnormal sound when the working condition changes.

[0004] How to invent a vehicle muffler structure to solve these problems has become a problem to be solved by the technical personnel in the field. SUMMARY

[0005] In order to make up for the above shortcomings, the present application provides a vehicle muffler structure, which aims to solve the problems mentioned in the above background.

[0006] The present application is implemented as follows: The present application provides a vehicle muffler structure, which comprises a muffler body composed of a cylinder, an exhaust pipe and a tail pipe, both ends of the cylinder are provided with end covers, the exhaust pipe and the tail pipe are fixedly connected with the two end covers respectively, the cylinder is provided with a baffle one, a baffle two and a baffle three at intervals, and the inner cavity of the cylinder is divided into a first chamber, a second chamber, a third chamber and a fourth chamber arranged in sequence, one end of the exhaust pipe located in the cylinder is fixedly connected with a gas outlet pipe one, one end of the tail pipe located in the cylinder is fixedly connected with a gas outlet pipe two, the baffle one and the baffle two are connected with a connecting pipe, and the side walls of the gas outlet pipe one, the connecting pipe and the gas outlet pipe two are provided with a plurality of through holes, and the vehicle muffler structure further comprises: The buffer cleaning assembly is arranged in the air outlet pipe; The vibration assembly is arranged in the second chamber and the third chamber.

[0007] Preferably, the inner end of the air outlet pipe extends into the first chamber, the inner end of the tail pipe extends into the fourth chamber, one end of the air outlet pipe one away from the air outlet pipe extends into the third chamber, one end of the air outlet pipe two away from the tail pipe extends into the first chamber, and a plurality of through holes are formed in the baffle one, the baffle two and the baffle three.

[0008] Preferably, the buffer cleaning assembly comprises a fixed ring fixedly installed on the inner wall of the air outlet pipe one and a limiting seat, the inner side of the fixed ring is fixedly connected with a support table, a shaft body is rotatably connected between the support table and the limiting seat, one end of the shaft body extends into the air outlet pipe, the end of the shaft body located in the air outlet pipe is fixedly connected with a fan blade, an installation plate is fixedly connected to the shaft body between the limiting seat and the support table, and a plurality of brush hairs are fixedly connected to the installation plate.

[0009] Preferably, a limiting ring is fixedly connected to the shaft body, the shaft body is rotatably connected with the limiting seat and the support table through the limiting ring, a plurality of air inlets are arranged between the fixed ring and the support table, the middle part of the limiting seat is provided with an hollow region, and the end of the brush hair abuts against the inner cavity side wall of the air outlet pipe one.

[0010] Preferably, the vibration assembly comprises a fixed plate, a corrugated sleeve, a movable cylinder and a connecting plate fixedly connected to the outer side of the connecting pipe, the fixed plate is fixedly arranged on the outer side of the air outlet pipe one and located in the third chamber, the fixed plate and the movable cylinder are elastically connected through a spring one, the movable cylinder is sealingly and slidably connected with the inner cavity of the air outlet pipe one, the movable cylinder is provided with a slot hole matched with the support table, the slot hole is blocked by the support table in the initial state of the spring one, and the total flow area of the through holes on the side wall of the air outlet pipe one is smaller than the flow area of the inlet of the air outlet pipe one.

[0011] Preferably, the movable cylinder is made of light material.

[0012] Preferably, one side of the fixed plate away from the baffle two is fixedly connected with one end of the corrugated sleeve, the other end of the corrugated sleeve is fixedly connected with the movable cylinder, the spring one is located in the inner side of the corrugated sleeve, the inner part of the movable cylinder is provided with a connecting channel and a limiting cavity, one end of the connecting channel penetrates through the side wall of the movable cylinder and the other end communicates with the limiting cavity, a piston rod is slidably connected in the limiting cavity, the movable cylinder is also provided with a hole for the piston rod to pass through, the piston rod and the limiting cavity are elastically connected through a spring two, and the end of the piston rod located on the outer side of the movable cylinder is rotatably connected with a ball.

[0013] Preferably, the inner end of the movable cylinder in the initial state of the spring abuts against the side wall of the fixed ring, and the end face of the ball abuts against the outer side wall of the second air outlet pipe.

[0014] Preferably, a connecting rod is fixedly connected to the movable cylinder, a hole matched with the connecting rod is arranged on the second partition plate, and a limiting cylinder limiting the connecting rod is fixedly connected to the second partition plate.

[0015] Preferably, the end of the connecting rod in the initial state of the spring abuts against the side wall of the connecting plate.

[0016] The beneficial effects of the present application are: Through the static structure design of the series connection and the cross reverse airflow path of the multiple chambers (the first to fourth chambers), the sound waves are forced to experience an extremely long and tortuous path, and are expanded, contracted, reflected and interfered multiple times, so that the sound energy is fully consumed, and the structure particularly enhances the cancellation ability of low-frequency noise which is difficult to eliminate, and the overall noise reduction effect is significantly better than that of the traditional structure; the dynamic mechanism introduced by the vibration assembly actively breaks the stable sound field in the muffler through the periodic mechanical vibration and pulsed airflow, effectively prevents the formation of harmful standing waves and resonance at a specific frequency, and thus solves the problem of low-frequency impact noise generated in sudden changes such as rapid acceleration and high load; the working frequency of the vibration assembly is directly controlled by the engine exhaust pressure, the lower the speed, the more stable the working condition, and the slower the action; the higher the speed, the greater the exhaust noise energy, and the higher the vibration frequency, the stronger the disturbance, so that the intelligent matching of the muffling intensity and the engine noise level is realized, and the strongest noise reduction support is provided when needed.

[0017] The buffer cleaning assembly integrated with the rotary brush washing and the vibration assembly integrated with the high-frequency vibration form a full-range self-cleaning network covering the key components such as the first air outlet pipe, the connecting pipe and the second air outlet pipe, the buffer cleaning assembly drives the bristles to rotate at high speed by using the kinetic energy of the exhaust gas to continuously scrape the perforated pipe inner wall where carbon deposition is prone to occur, thereby preventing blockage, and the vibration assembly shakes off the carbon deposition in positions that cannot be reached by other cleaning methods through the reciprocating impact of the movable cylinder, the connecting rod and the piston rod, thereby fundamentally solving the problems of exhaust back pressure rise, engine power drop, oil consumption increase and muffling performance degradation caused by carbon deposition blockage, and the entire cleaning process completely utilizes the energy (pressure energy and kinetic energy) of the exhaust gas itself, without the need for external power source or user intervention, so that the user no longer needs to disassemble the muffler for high-temperature baking or chemical cleaning, thereby saving a lot of maintenance cost and time. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and other related drawings can also be obtained by those skilled in the art without any creative effort on the basis of the drawings.

[0019] Figure 1 is a schematic diagram of the overall structure of the present application; Figure 2 is a schematic diagram of the internal structure of the cylinder of the present application; Figure 3 is a schematic diagram of the exhaust gas flow direction of the muffler main body of the present application when working; Figure 4 is a schematic diagram of the distribution structure of the gas outlet pipe one, connecting pipe and gas outlet pipe two of the present application; Figure 5 is a schematic diagram of the Figure 4 enlarged structure at A of the present application; Figure 6 is a schematic diagram of the cross-sectional structure of the muffler main body of the present application; Figure 7 is a schematic diagram of the Figure 6 enlarged structure at B of the present application; Figure 8 is a schematic diagram of the Figure 6 enlarged structure at C of the present application.

[0020] In the drawings: 1, cylinder; 2, baffle one; 3, gas outlet pipe one; 4, connecting pipe; 5, gas outlet pipe two; 6, corrugated sleeve; 7, movable cylinder; 8, connecting rod; 9, support table; 10, muffler main body; 11, exhaust pipe; 12, tail pipe; 21, baffle two; 22, baffle three; 31, fixed ring; 32, limiting seat; 33, shaft body; 34, fan blade; 41, connecting plate; 61, spring one; 71, connecting channel; 72, limiting cavity; 73, piston rod; 74, spring two; 91, air inlet; 101, first chamber; 102, second chamber; 103, third chamber; 104, fourth chamber; 211, fixed plate; 212, limiting cylinder; 330, limiting ring; 331, mounting plate; 332, bristles; 731, ball. DETAILED DESCRIPTION

[0021] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] Embodiment one, refer to Figures 1-8 A car muffler structure, comprising a muffler body 10, the muffler body 10 is composed of a cylinder 1, an exhaust pipe 11 and a tail pipe 12, the both ends of the cylinder 1 are provided with end covers, the exhaust pipe 11 and the tail pipe 12 are fixedly connected with the two end covers respectively, the cylinder 1 is provided with a partition plate one 2, a partition plate two 21 and a partition plate three 22 at intervals, and the inner cavity of the cylinder 1 is divided into a first chamber 101, a second chamber 102, a third chamber 103 and a fourth chamber 104 arranged in sequence. The design of this multi-chamber structure (preferably four or more) is to build a more complex sound wave reflection and interference path. The volume and shape of each chamber can be designed specifically to cover a wider frequency band in the resonant frequency, especially to enhance the ability to eliminate low-frequency noise. The sound wave is reflected, expanded and contracted multiple times between different chambers, and its energy is gradually consumed, thereby achieving a more excellent broadband muffling effect.

[0023] The one end of the exhaust pipe 11 located in the cylinder 1 is fixedly connected with an air outlet pipe one 3, the one end of the tail pipe 12 located in the cylinder 1 is fixedly connected with an air outlet pipe two 5, and the partition plate one 2 and the partition plate two 21 are connected with a connecting pipe 4. The side walls of the air outlet pipe one 3, the connecting pipe 4 and the air outlet pipe two 5 are all provided with a plurality of through holes. These perforated pipes are the core acoustic elements of the resistance muffler, which function in sound wave coupling. It allows sound waves to couple between pipes and chambers through small holes, consumes sound energy of specific frequencies by using the principle of Helmholtz resonator, and also ensures that the exhaust gas can smoothly flow into each chamber for multiple expansion and pressure reduction.

[0024] It also comprises: a buffer cleaning assembly arranged in the air outlet pipe one 3; a vibration assembly arranged in the second chamber 102 and the third chamber 103.

[0025] Further, the inner end of the exhaust pipe 11 extends into the first chamber 101, the inner end of the tail pipe 12 extends into the fourth chamber 104, the one end of the air outlet pipe one 3 away from the exhaust pipe 11 extends into the third chamber 103, the one end of the air outlet pipe two 5 away from the tail pipe 12 extends into the first chamber 101, and a plurality of through holes are provided on the partition plate one 2, the partition plate two 21 and the partition plate three 22 to allow the gas to flow slowly between adjacent chambers.

[0026] In the present embodiment, the airflow path is shown in reference to Figure 4 , the exhaust gas from the exhaust pipe 11 into the out pipe 3, then, most of the gas through the out pipe 3 into the third chamber 103, and then through the connecting pipe 4 to the first chamber 101, and then through the out pipe 2 5 to the tail pipe 12, and then discharged; in the above process, part of the gas will be through the out pipe 3, out pipe 2 5 and connecting pipe 4 on the through hole shunt to the first chamber 101, second chamber 102, third chamber 103 or the fourth chamber 104.

[0027] The design forces the exhaust gas to experience a very tortuous, long path inside the muffler, and experience at least four times the chamber expansion and multiple perforated pipe friction and resonance, greatly increasing the friction opportunity of sound wave and wall, baffle, converting sound energy into heat energy, at the same time, the sound waves between different paths will occur more complex interference and cancellation, so as to realize the noise reduction in a wider frequency range, not only for several specific frequencies, because the sound wave energy is fully consumed, the overall noise reduction effect, especially the inhibition effect of low frequency noise, is significantly better than that of traditional three chamber or double chamber structure; although the path is long, but due to the perforated pipe and baffle hole to ensure sufficient airflow passage, and does not form a very high exhaust resistance, while ensuring excellent silence effect, the negative impact on engine power and fuel consumption is minimized.

[0028] Further, the buffer cleaning assembly comprises a fixed ring 31 and a limiting seat 32 fixedly installed on the inner wall of the out pipe 3, the inner side of the fixed ring 31 is fixedly connected with a support table 9, the support table 9 and the limiting seat 32 are rotatably connected with a shaft body 33, the support table 9 can provide support for the shaft body 33 on one hand, and can guide the gas on the other hand, one end of the shaft body 33 extends into the exhaust pipe 11, the end of the shaft body 33 located in the exhaust pipe 11 is fixedly connected with a fan blade 34, the exhaust gas discharged from the exhaust pipe 11 can push the fan blade 34 to drive the shaft body 33 to rotate, the shaft body 33 located between the limiting seat 32 and the support table 9 is fixedly connected with a mounting plate 331, the mounting plate 331 is fixedly connected with a brush 332, the shaft body 33 rotates, which can drive the brush 332 to clean the inner cavity of the out pipe 3.

[0029] It should be noted that the shaft body 33 is fixedly connected with a limiting ring 330, the shaft body 33 is rotatably connected with the limiting seat 32 and the support table 9 through the limiting ring 330, the limiting ring 330 ensures that the shaft body 33 rotates stably without axial movement, a plurality of air inlets 91 are arranged between the fixed ring 31 and the support table 9, the middle part of the limiting seat 32 is provided with a hollow area, the air inlets 91 and the hollow area of the limiting seat 32 ensure the auxiliary passage of the airflow and the heat dissipation of the assembly, the end of the brush 332 abuts against the inner cavity side wall of the out pipe 3, which ensures that the brush 332 can effectively clean the out pipe 3.

[0030] In the embodiment, the high-speed flowing exhaust gas impacts the fan blades 34, the driving shaft body 33 rotates, the mounting plate 331 and the bristles 332 on the shaft body 33 rotate together, and since the end of the bristles 332 is always in contact with the inner wall of the outlet pipe 1, it forms a continuously working rotary brush that automatically scrapes and removes the carbon and oil stains attached to the inner wall of the pipe and the through hole, fundamentally solving the problems of the traditional muffler, such as the increase of exhaust back pressure, the decline of engine performance, and the deterioration of muffling effect caused by carbon blockage, and the power is completely derived from the exhaust gas, without the need for additional energy input, and the muffler does not need to be disassembled and cleaned from the car, saving a lot of cost and effort for the user, and ensuring that the acoustic performance and flow performance of the muffler remain stable throughout the service life.

[0031] Embodiment two, refer to Figures 3-8 The vibration assembly includes a fixed plate 211, a corrugated sleeve 6, a movable cylinder 7, and a connecting plate 41 fixedly connected to the outside of the connecting pipe 4. The fixed plate 211 is fixedly arranged on the outside of the outlet pipe 1 and located inside the third chamber 103. The fixed plate 211 is elastically connected to the movable cylinder 7 through a spring 61. The movable cylinder 7 is sealingly and slidingly connected to the inner cavity of the outlet pipe 1. The movable cylinder 7 is provided with a slot hole matched with the support platform 9. The support platform 9 in the initial state of the spring 61 blocks the slot hole. The total flow area of the through holes on the side wall of the outlet pipe 1 is smaller than the flow area of the inlet of the outlet pipe 1. To ensure that the movable cylinder 7 can be effectively pushed, it is necessary to ensure that the total flow area of all side holes of the outlet pipe 1 is much smaller than the cross-sectional area of the inlet of the outlet pipe 1. In this way, when the movable cylinder 7 is closed, the gas flow cannot be quickly discharged from the side hole, and the pressure in the pipe can be quickly established, thereby pushing open the movable cylinder 7. Before the movable cylinder 7 is pushed open, the side hole is the main but insufficient discharge path. Because of its insufficient discharge capacity, pressure accumulates. Once the pressure reaches the threshold value, it will overcome the elastic force of the spring 61 to push open the movable cylinder 7, and the main passage is opened. At this time, most of the gas will be discharged at high speed from the end of the pipe, realizing smooth exhaust.

[0032] It should be noted that the movable cylinder 7 is made of light material, such as aluminum alloy, engineering plastic, or composite structure with rubber. The smaller the mass, the faster the response.

[0033] Further, one side of the fixed plate 211 away from the partition plate two 21 is fixedly connected with one end of the corrugated sleeve 6, the other end of the corrugated sleeve 6 is fixedly connected with the movable cylinder 7, the spring one 61 is located inside the corrugated sleeve 6, the inside of the movable cylinder 7 is provided with a connecting channel 71 and a limiting cavity 72, one end of the connecting channel 71 penetrates through the side wall of the movable cylinder 7, and the other end is in communication with the limiting cavity 72, the inside of the limiting cavity 72 is slidably connected with a piston rod 73, the movable cylinder 7 is also provided with a hole passing through the piston rod 73, the piston rod 73 and the limiting cavity 72 are elastically connected through a spring two 74, the end of the piston rod 73 located outside the movable cylinder 7 is rotatably clamped with a spherical body 731, the spring one 61 is wrapped in the corrugated sleeve 6, forming a sealed space.

[0034] It should be noted that the inner end of the movable cylinder 7 in the initial state of the spring one 61 abuts against the side wall of the fixed ring 31, and at this time, the end face of the spherical body 731 abuts against the outer side wall of the air outlet pipe two 5, so that when the movable cylinder 7 is reset, the impact force can be applied to the air outlet pipe one 3 through the fixed ring 31, and the impact force can be applied to the air outlet pipe two 5 through the spherical body 731, so as to knock and vibrate the outer wall of the air outlet pipe two 5 and the inner wall of the air outlet pipe one 3, and shake off the accumulated carbon thereon.

[0035] Further, the movable cylinder 7 is fixedly connected with a connecting rod 8, the partition plate two 21 is provided with a hole matched with the connecting rod 8, and the partition plate two 21 is also fixedly connected with a limiting cylinder 212 for limiting the connecting rod 8, the end of the connecting rod 8 in the initial state of the spring one 61 abuts against the side wall of the connecting plate 41, so that when the movable cylinder 7 is reset, the connecting rod 8 can also transmit the impact force to the connecting pipe 4 through the connecting plate 41, thereby expanding the cleaning range.

[0036] In the embodiment, since the total flow area of the through hole on the side wall of the air outlet pipe one 3 is smaller than the flow area of the inlet of the air outlet pipe one 3, when the exhaust gas flows through the air outlet pipe one 3, the pressure in the pipeline is established first, in the initial state, the spring one 61 pulls the movable cylinder 7, so that the inner end thereof abuts against the side wall of the fixed ring 31, at this time, the support table 9 blocks the slot hole on the movable cylinder 7, the internal passage at the outlet of the air outlet pipe one 3 is temporarily closed, and the exhaust gas cannot pass through smoothly, so that the pressure in the air outlet pipe one 3 is rapidly accumulated.

[0037] When the pressure in the pipe is high enough to overcome the pre-tightening force of spring 61, the high-pressure gas pushes the movable cylinder 7 to slide away from the fixed plate 211 to stretch the spring 61. After the movable cylinder 7 moves, the slot holes on it are misaligned with the support table 9, the channel is opened, the high-pressure exhaust gas is released instantly, and the movable cylinder 7 moves while pulling the connecting rod 8 to move away from the connecting plate 41. After the high-pressure release, the pressure in the pipe decreases, and the spring 61 pushes the movable cylinder 7 to reset, impacting the fixed ring 31 and knocking off the accumulated carbon on the exhaust pipe 3. The brush 332 works together to achieve better cleaning effect. At the same time, the movable cylinder 7 closes the channel again, and the pressure starts to accumulate again. The reset of the movable cylinder 7 will make the end of the connecting rod 8 hit the connecting plate 41 on the outside of the connecting pipe 4, producing a strong mechanical impact and vibration, knocking off the accumulated carbon on the connecting pipe 4. This process repeats, and the movable cylinder 7 and the connecting rod 8 perform high-frequency reciprocating motion, forming continuous knocking and vibration.

[0038] In addition, when the gas flow pushes the movable cylinder 7 to open, the internal space of the corrugated sleeve 6 becomes larger, the pressure becomes smaller, and the gas flow in the limiting cavity 72 returns to the corrugated sleeve 6 through the connecting channel 71. Under the action of spring 74, the piston rod 73 pulls the ball 731 to move away from the side wall of the exhaust pipe 2. When the spring 61 resets, the internal space of the corrugated sleeve 6 becomes smaller, the pressure increases, the gas returns to the limiting cavity 72 through the connecting channel 71, and overcomes the elastic force of the spring 74, pushing the piston rod 73 and the ball 731 to hit the side wall of the exhaust pipe 2, further expanding the cleaning range.

[0039] Through the cycle of this mechanism, three cleaning effects are achieved. The cleaning of the exhaust pipe 1: when the movable cylinder 7 resets, it hits the fixed ring 31, directly vibrating the exhaust pipe 1 where it is located, loosening the accumulated carbon on the inner wall, and then being scraped off by the rotating brush 332; the cleaning of the connecting pipe 4: the connecting rod 8 hits the connecting plate 41 violently, directly transmitting the vibration to the connecting pipe 4, and knocking off the accumulated carbon on it; the cleaning of the exhaust pipe 2: the piston rod 73 and the ball 731 driven by the pressure change in the corrugated sleeve 6 periodically knock the outer wall of the exhaust pipe 2, completing the cleaning of the third key part. Through periodic high-intensity mechanical impact and vibration, the accumulated carbon and sludge on the internal components of the exhaust pipe 1, the connecting pipe 4, and the exhaust pipe 2 can be effectively loosened and peeled off. Combined with the buffer cleaning assembly, a full-range self-cleaning system of active rotating brush washing + passive high-frequency knocking is formed. The power source of the entire system comes entirely from the exhaust pressure energy that is usually wasted, without any external power, realizing closed-loop utilization of energy. By preventing the formation and accumulation of carbon, the excellent acoustic performance (stable back pressure and non-decreasing sound attenuation effect) of the muffler can be maintained throughout its life cycle, greatly improving the durability and reliability of the product.

[0040] The periodic pressure release and component movement of the vibration assembly of the third embodiment break the stable sound field distribution inside the muffler, avoid strong resonance at fixed frequencies, and are particularly beneficial to reducing low-frequency booming noise and improving the subjective feeling of muffling quality. This is the most fundamental difference between the present application and traditional designs. Fixed structures cannot respond to changing conditions, while the vibration assembly of the present application introduces a key dynamic variable.

[0041] The sound field inside a traditional muffler is relatively stable, and strong standing waves and resonance can easily occur at specific frequencies, which is the source of some low-frequency booming noise. In the present application, the periodic movement of the movable cylinder 7 and the periodic knocking of the piston rod 73 and the ball 731, as well as the impact of the connecting rod 8 on the connecting pipe 4, are equivalent to installing a mechanical acoustic disturber inside the muffler. These continuous mechanical vibrations and pulsed air flows effectively disrupt the stable acoustic modes and prevent any single frequency sound energy from being amplified excessively. Therefore, it can very effectively suppress low-frequency resonance noise and impact noise that occurs during sudden acceleration, high load, and other working condition changes.

[0042] The working frequency of the vibration assembly is directly controlled by the engine exhaust pressure. The higher the engine speed and the greater the load, the greater the exhaust pressure and flow rate, and the more frequent the pressure accumulation and release cycles of the movable cylinder 7 per unit time (the higher the frequency). This means that the dynamic disturbance intensity of the muffler is positively correlated with the severity of the noise. When the engine is at low speed and in a steady state, the exhaust noise is small, the vibration assembly moves slowly or not at all, and remains silent. When high-energy, wide-band noise occurs during sudden acceleration, the exhaust pressure increases suddenly, and the vibration assembly enters a high-frequency working state to produce stronger disturbances to cope with more serious noise problems, achieving self-adaptation to engine operating conditions and providing the strongest noise reduction support when needed, achieving intelligent noise reduction.

[0043] The static multi-chamber structure of the present application provides a wide-frequency basic muffling platform, and the dynamic vibration mechanism is on top of this platform, dynamically smoothing the peaks (resonance peaks) that may occur on the platform and responding to sudden high-energy impacts. At the same time, the buffer and cleaning assembly ensures that the entire system (especially the through hole) is always in the best working condition as designed at the beginning, preventing static structure failure and dynamic mechanism failure due to carbon deposition blockage. Creatively using the energy of the exhaust itself to drive a mechanical disturbance system, actively breaking harmful acoustic resonance, the present application solves the problem of limited noise reduction effect of fixed structures on specific frequencies (especially low frequencies) and the inability to adapt to changes in working conditions.

[0044] The control mode of the present application is automatically controlled by a controller, the control circuit of the controller can be realized by simple programming of those skilled in the art, the power supply also belongs to the common knowledge in the art, and the present application is mainly used for protecting mechanical devices, so the control mode and circuit connection of the present application will not be explained in detail.

[0045] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A car muffler structure, comprising a muffler body (10), the muffler body (10) being composed of a cylindrical body (1), an exhaust pipe (11), and a tailpipe (12), wherein end caps are provided at both ends of the cylindrical body (1), and the exhaust pipe (11) and tailpipe (12) are respectively fixedly connected to the two end caps, characterized in that, The cylinder (1) is provided with partitions 1 (2), 2 (21), and 3 (22) at intervals, dividing the inner cavity of the cylinder (1) into a first chamber (101), a second chamber (102), a third chamber (103), and a fourth chamber (104) arranged in sequence. One end of the exhaust pipe (11) located in the cylinder (1) is fixedly connected to an outlet pipe 1 (3), and one end of the tail pipe (12) located in the cylinder (1) is fixedly connected to an outlet pipe 2 (5). A connecting pipe (4) is connected through the partitions 1 (2) and 2 (21). Several through holes are opened on the side walls of the outlet pipe 1 (3), the connecting pipe (4), and the outlet pipe 2 (5). Buffer cleaning assembly: The buffer cleaning assembly is installed inside the air outlet pipe (3); Vibration assembly: The vibration assembly is disposed in the second chamber (102) and the third chamber (103).

2. The automotive muffler structure according to claim 1, characterized in that, The inner end of the exhaust pipe (11) extends into the first chamber (101), the inner end of the tail pipe (12) extends into the fourth chamber (104), one end of the exhaust pipe (3) away from the exhaust pipe (11) extends into the third chamber (103), one end of the exhaust pipe (5) away from the tail pipe (12) extends into the first chamber (101), and several through holes are provided on the partition plate (2), partition plate (21) and partition plate (22).

3. The automotive muffler structure according to claim 1, characterized in that, The buffer cleaning assembly includes a fixing ring (31) and a limiting seat (32) fixedly installed on the inner wall of the air outlet pipe (3). A support platform (9) is fixedly connected to the inner side of the fixing ring (31). A shaft (33) is rotatably connected between the support platform (9) and the limiting seat (32). One end of the shaft (33) extends into the exhaust pipe (11). A fan blade (34) is fixedly connected to the end of the shaft (33) located in the exhaust pipe (11). A mounting plate (331) is fixedly connected to the shaft (33) located between the limiting seat (32) and the support platform (9). Brush bristles (332) are fixedly connected to the mounting plate (331).

4. The automotive muffler structure according to claim 3, characterized in that, A limiting ring (330) is fixedly connected to the shaft (33). The shaft (33) is rotatably engaged with the limiting seat (32) and the support platform (9) through the limiting ring (330). Several air inlets (91) are provided between the fixing ring (31) and the support platform (9). A hollow area is provided in the middle of the limiting seat (32). The end of the bristles (332) abuts against the inner wall of the air outlet pipe (3).

5. The automotive muffler structure according to claim 3, characterized in that, The vibration assembly includes a fixed plate (211), a corrugated sleeve (6), a movable cylinder (7), and a connecting plate (41) fixedly connected to the outside of the connecting pipe (4). The fixed plate (211) is fixedly set on the outside of the first air outlet pipe (3) and located inside the third chamber (103). The fixed plate (211) and the movable cylinder (7) are elastically connected by a spring (61). The movable cylinder (7) and the inner cavity of the first air outlet pipe (3) are sealed and slidably connected. The movable cylinder (7) is provided with a slot that matches the support platform (9). The support platform (9) in the initial state of the spring (61) blocks the slot. The total flow area of ​​the through holes on the side wall of the first air outlet pipe (3) is smaller than the flow area of ​​the inlet of the first air outlet pipe (3).

6. The automotive muffler structure according to claim 5, characterized in that, The movable cylinder (7) is made of lightweight material.

7. The automotive muffler structure according to claim 5, characterized in that, One side of the fixed plate (211) away from the partition (21) is fixedly connected to one end of the corrugated sleeve (6), and the other end of the corrugated sleeve (6) is fixedly connected to the movable cylinder (7). The spring (61) is located inside the corrugated sleeve (6). The movable cylinder (7) has a connecting channel (71) and a limiting cavity (72) inside. One end of the connecting channel (71) passes through the side wall of the movable cylinder (7), and the other end is connected to the limiting cavity (72). The piston rod (73) is slidably connected inside the limiting cavity (72). The movable cylinder (7) also has a channel for the piston rod (73) to pass through. The piston rod (73) and the limiting cavity (72) are elastically connected by the spring (74). The end of the piston rod (73) located outside the movable cylinder (7) is rotatably engaged with a ball (731).

8. The automotive muffler structure according to claim 7, characterized in that, When the spring (61) is in its initial state, the inner end of the movable cylinder (7) abuts against the side wall of the fixed ring (31), and at this time the end face of the ball (731) abuts against the outer wall of the air outlet pipe (5).

9. The automotive muffler structure according to claim 5, characterized in that, A connecting rod (8) is fixedly connected to the movable cylinder (7), and a channel matching the connecting rod (8) is provided on the partition plate (21). A limiting cylinder (212) for limiting the connecting rod (8) is also fixedly connected to the partition plate (21).

10. The automotive muffler structure according to claim 9, characterized in that, When the spring (61) is in its initial state, the end of the connecting rod (8) abuts against the side wall of the connecting plate (41).

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