A muffler and an engine

Abstract

An embodiment of the present invention provides a muffler and an engine. The muffler includes an intake pipe, a muffling chamber, a first expansion chamber, a first baffle plate, and a first resonance chamber. The outlet end of the intake pipe penetrates the inlet of the muffling chamber in a gapless manner and is installed on the muffling chamber in a manner opposite to and communicating with the inlet of the first expansion chamber. The closed end of the first expansion chamber penetrates the first through hole of the first baffle plate disposed inside the muffling chamber and is placed inside the muffling chamber. One end of the first resonance chamber with an outlet is used as the first end and penetrates the outlet of the muffling chamber in a gapless manner, and the second end is in complete contact with the closed end of the first expansion chamber. Applying the solution provided by the embodiment of the present invention can improve the service life without being affected by the ambient temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic wave processing, and particularly to a muffler and an engine. Background Art

[0002] Currently, a traditional muffler includes a muffler cylinder filled with sound-absorbing cotton. Countless porous gaps are formed inside and between the sound-absorbing cotton. When sound waves are transmitted from the inlet of the muffler cylinder to these gaps and continuously rub against the air in the gaps, the sound waves are continuously attenuated, thereby achieving the purpose of noise reduction. Generally speaking, the higher the frequency, the more severely the sound wave attenuates. However, the sound-absorbing cotton is prone to deformation and aging under continuous high temperature conditions.

[0003] It can be seen that the traditional muffler is easily restricted by temperature and has a low service life. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a muffler and an engine, which can improve the service life without being affected by the ambient temperature. The specific technical solutions are as follows:

[0005] In a first aspect, the embodiments of the present invention provide a muffler, which includes an intake pipe, a sound-absorbing chamber, a first expansion chamber, a first baffle, and a first resonance chamber;

[0006] Among them, the sound-absorbing chamber is a cavity with an air inlet and an air outlet at both ends;

[0007] The first expansion chamber is a cavity with an air inlet at one end and a closed end at the other end, and a plurality of air outlet holes with a first aperture are provided on the outer side wall of the cavity of the first expansion chamber;

[0008] The first baffle is provided with a first through hole that cooperates with the outer side wall of the first expansion chamber, and an air outlet hole for guiding the gas to flow out;

[0009] The first resonance chamber is a cavity with an air outlet at one end, and an air inlet hole with a second aperture is provided on the outer side wall of the cavity of the first resonance chamber, where the second aperture is smaller than the first aperture;

[0010] The air outlet end of the intake pipe penetrates the air inlet of the sound-absorbing chamber in a gapless manner and is installed on the sound-absorbing chamber in a manner that is opposite to and communicated with the air inlet of the first expansion chamber; among them, the closed end of the first expansion chamber penetrates the first through hole of the first baffle and is placed on the first baffle, and the first baffle is placed inside the sound-absorbing chamber;

[0011] One end of the first resonance chamber with an air outlet penetrates the air outlet of the sound-absorbing chamber in a gapless manner as the first end, and the second end is in full contact with the closed end of the first expansion chamber.

[0012] In one embodiment of the present invention, the silencer further includes: a second baffle;

[0013] The second baffle is provided with a second through hole that cooperates with the outer side wall of the first resonance chamber, and an air outlet for guiding the gas to flow out;

[0014] Wherein, the second baffle is placed in the sound insulation chamber, the first end of the first resonance chamber sequentially penetrates through the second through hole and the air outlet of the sound insulation chamber in a gapless manner, and the gap between the second baffle and the end of the sound insulation chamber is filled with sound absorption material.

[0015] In one embodiment of the present invention, the silencer further includes at least one sound insulation component;

[0016] Wherein, the sound insulation component includes a second expansion chamber having the same structure as the first expansion chamber, a third baffle, a fourth baffle, and a second resonance chamber having the same structure as the first resonance chamber;

[0017] The third baffle is provided with a third through hole that cooperates with the outer side wall of the second expansion chamber, and an air outlet for guiding the gas to flow out;

[0018] The fourth baffle is provided with a fourth through hole that cooperates with the outer side wall of the second resonance chamber;

[0019] The second end of the second resonance chamber is in complete contact with the closed end of the first expansion chamber, the first end of the second resonance chamber penetrates through the fourth through hole of the fourth baffle, and the air outlet of the first end is opposite to and communicated with the air inlet of the second expansion chamber, the closed end of the second expansion chamber is in complete contact with the second end of the first resonance chamber, and the second expansion chamber penetrates through the third through hole of the third baffle and is placed on the third baffle.

[0020] In one embodiment of the present invention, the silencer further includes at least two sound insulation components;

[0021] In each sound insulation component, the air outlet of the first end of the second resonance chamber penetrates through the fourth through hole of the fourth baffle, and is opposite to and communicated with the air inlet of the second expansion chamber, the second expansion chamber penetrates through the third through hole of the third baffle and is placed on the third baffle;

[0022] The sound insulation components are arranged in a row in contact with each other in sequence from head to tail. Among them, the second end of the second resonance chamber in the sound insulation component is in complete contact with the closed end of the second expansion chamber of the previous group of sound insulation components, and the closed end of the second expansion chamber of the sound insulation component is in complete contact with the second end of the second resonance chamber of the next group of sound insulation components;

[0023] The second end of the second resonance chamber of the first silencing component in the queue is in complete contact with the closed end of the first expansion chamber, and the closed end of the second expansion chamber of the last silencing component in the queue is in complete contact with the second end of the first resonance chamber.

[0024] In one embodiment of the present invention, the muffler further includes at least one fifth baffle;

[0025] Wherein, the fifth baffle is provided with a fifth through hole that cooperates with the outer side wall of the second expansion chamber, and an air outlet hole for guiding the gas to flow out;

[0026] The fifth baffle is sleeved on the closed end of the second expansion chamber in at least one of the silencing components, and the gap between the third baffle and the fifth baffle sleeved on the same second expansion chamber is filled with sound-absorbing material.

[0027] In one embodiment of the present invention, the sound-absorbing material filled in the gap between the third baffle and the fifth baffle sleeved on the same second expansion chamber is rock wool or glass wool.

[0028] In one embodiment of the present invention, the sound-absorbing material filled in the gap between the second baffle and the end of the sound-absorbing chamber is rock wool or glass wool.

[0029] In one embodiment of the present invention, the air outlet end of the intake pipe penetrates through the air inlet of the sound-absorbing chamber in a gapless manner, and is installed on the sound-absorbing chamber in a manner of being opposite to and communicating with the air inlet of the first expansion chamber through a reinforcing rib.

[0030] In one embodiment of the present invention, the first aperture is 10 mm, and / or, the second aperture is 3 mm to 5 mm.

[0031] In one embodiment of the present invention, the material of the sound-absorbing chamber is selected as 304 stainless steel, and / or, the first baffle is selected as 409L stainless steel.

[0032] In a second aspect, an embodiment of the present invention provides an engine, and the engine includes: an engine main body and the muffler described above;

[0033] Wherein, the exhaust pipe of the engine main body is communicated with the intake pipe of the muffler.

[0034] An embodiment of the present invention provides a muffler and an engine. The muffler includes an intake pipe, a muffling chamber, a first expansion chamber, a first baffle, and a first resonance chamber. The outlet end of the intake pipe penetrates the inlet of the muffling chamber in a gapless manner and is installed on the muffling chamber in a manner opposite to and communicating with the inlet of the first expansion chamber. The closed end of the first expansion chamber penetrates the first through hole of the first baffle disposed in the muffling chamber and is placed inside the muffling chamber. One end of the first resonance chamber with an outlet penetrates the outlet of the muffling chamber in a gapless manner as the first end, and the second end is in full contact with the closed end of the first expansion chamber. Compared with traditional mufflers, the embodiment of the present invention no longer uses sound-absorbing cotton, but is provided with a first expansion chamber, a first baffle, and a first resonance chamber, so that sound waves with different frequencies pass through the space formed by the first expansion chamber, the first baffle, the first resonance chamber, and the muffling chamber in sequence for scattering and resonance to achieve the purpose of consuming the energy of the sound waves. At the same time, the sound wave frequencies can be filtered one by one while consuming energy through the air outlet holes of the first expansion chamber, the air outlet holes of the first baffle, and the air inlet holes of the first resonance chamber, thereby achieving the purpose of muffling. It can be seen that the embodiment of the present invention can improve the service life of the muffler on the basis of achieving muffling and without being affected by the ambient temperature. Of course, any product or method implementing the present invention does not necessarily need to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 is a schematic structural diagram of a muffler provided by the present invention;

[0037] Figure 2 is a schematic structural diagram of a muffling component provided by an embodiment of the present invention;

[0038] Figure 3 is a schematic structural diagram of the front view of the muffling component provided by an embodiment of the present invention.

[0039] Wherein, Figures 1 to 3 the corresponding relationship between the names of the components and the corresponding reference numerals is as follows:

[0040] 1 - intake pipe, 2 - muffling chamber, 3 - first expansion chamber, 4 - first baffle, 5 - first resonance chamber, 6 - second baffle, 7 - sound-absorbing material, 8 - second expansion chamber, 9 - third baffle; 10 - fourth baffle; 11 - second resonance chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] See Figure 1 , a schematic structural diagram of a muffler provided by an embodiment of the present invention. The muffler includes: an intake pipe 1, a silencing chamber 2, a first expansion chamber 3, a first baffle 4, and a first resonance chamber 5;

[0043] Among them, the silencing chamber 2 is a cavity with an air inlet and an air outlet provided at both ends respectively;

[0044] The first expansion chamber 3 is a cavity with an air inlet provided at one end and closed at the other end, and a plurality of air outlet holes with a first aperture are provided on the outer side wall of the cavity of the first expansion chamber 3;

[0045] The first baffle 4 is provided with a first through hole that cooperates with the outer side wall of the first expansion chamber 3, and an air outlet hole for guiding the gas to flow out;

[0046] The first resonance chamber 5 is a cavity with an air outlet provided at one end, and an air inlet hole with a second aperture is provided on the outer side wall of the cavity of the first resonance chamber 5, where the second aperture is smaller than the first aperture;

[0047] The air outlet end of the intake pipe 1 penetrates through the air inlet of the silencing chamber 2 in a gapless manner and is installed on the silencing chamber 2 in a manner that is opposite to and communicated with the air inlet of the first expansion chamber 3; among them, the closed end of the first expansion chamber 3 penetrates through the first through hole of the first baffle 4 and is placed on the first baffle 4, and the first baffle 4 is placed inside the silencing chamber 2;

[0048] One end of the first resonance chamber 5 with an air outlet penetrates through the air outlet of the silencing chamber 2 in a gapless manner as the first end, and the second end is in complete contact with the closed end of the first expansion chamber 3.

[0049] Specifically, the intake pipe 1 can be composed of two hollow structures with different cross-sectional areas. Among them, the hollow structure with a larger cross-sectional area is provided with an air inlet for receiving sound waves, and the hollow structure with a smaller cross-sectional area is provided with an air outlet for transmitting sound waves. In addition, the above-mentioned hollow structure with a larger cross-sectional area can be a conical hollow structure.

[0050] In one embodiment of the present invention, the outlet end of the intake pipe 1 penetrates the intake port of the soundproof chamber 2 in a gapless manner and is installed on the soundproof chamber 2 through a reinforcing rib in a manner opposite to and communicating with the intake port of the first expansion chamber 3; this can improve the installation strength between the intake pipe 1 and the soundproof chamber 2 and also reduce the vibration of the intake pipe 1 during operation.

[0051] The first expansion chamber 3 can be a cylindrical cavity structure or a rectangular cavity structure, and the embodiments of the present invention do not limit this.

[0052] The above installation on the soundproof chamber 2 in a manner opposite to and communicating with the intake port of the first expansion chamber 3 can be understood as that the intake port of the first expansion chamber 3 is opposite to the outlet of the intake pipe 1 and is in a communicating state.

[0053] Among them, the connection mode between the intake port of the first expansion chamber 3 and the outlet of the soundproof chamber 2 can be indirectly connected or directly connected.

[0054] Specifically, one implementation of indirect connection can be: the connecting piece is a threaded pipe with an external thread, and internal threads are provided in both the intake port of the first expansion chamber 3 and the outlet of the soundproof chamber 2, and the intake port of the first expansion chamber 3 and the outlet of the soundproof chamber 2 are connected together through the threaded fit of the connecting piece.

[0055] One implementation of direct connection can be: internal threads are provided in one of the intake port of the first expansion chamber 3 and the outlet of the intake pipe 1, and external threads are provided in the other. That is, when internal threads are provided in the intake port of the first expansion chamber 3, external threads are provided in the outlet of the intake pipe 1, or when external threads are provided in the intake port of the first expansion chamber 3, internal threads are provided in the outlet of the intake pipe 1. In this way, the first expansion chamber 3 and the intake port can achieve the purpose of direct connection through threaded fit. Compared with the muffler that connects the first expansion chamber 3 and the intake pipe 1 through a connecting piece, direct connection can not only reduce the occupied space of the first expansion chamber 3 in the soundproof chamber 2, but also reduce the weight of the muffler and save costs.

[0056] In addition, the first expansion chamber 3 has the function of scattering sound waves. That is, the larger the volume inside the cavity of the first expansion chamber 3, the better. Since the first expansion chamber 3 is built into the soundproof chamber 2, it can be seen that the volume of the first expansion chamber 3 should be smaller than the volume inside the cavity of the soundproof chamber 2, and if the volume of the first expansion chamber 3 is too large, it will also increase the weight and volume of the muffler itself, which is not conducive to carrying and installation. Based on this, the volume of the first expansion chamber 3, the size of the first aperture of the air outlet holes of the first expansion chamber 3, and the number of the first apertures can all be determined according to existing empirical formulas.

[0057] The above-mentioned first baffle 4 is provided with a first through hole that mates with the outer sidewall of the first expansion chamber 3. It can be understood that the first through hole of the first baffle 4 can be exactly assembled on the outer sidewall of the first expansion chamber 3.

[0058] The first resonance chamber 5 can be a cylindrical cavity structure or a rectangular cavity structure. The embodiments of the present invention do not limit this here.

[0059] The first resonance chamber 5 can be a cavity with an air outlet at one end and an open end at the other end, or a cavity with an air outlet at one end and a closed end at the other end. The present embodiment does not make specific limitations on this.

[0060] In addition, the end face area of the second end of the first resonance chamber 5 is smaller than the end face area of the closed end of the first expansion chamber 3. Based on the resonance effect of the first resonance chamber 5, the volume of the cavity of the first resonance chamber 5 is smaller than the volume of the cavity of the first expansion chamber 3. Based on this, the volume of the first resonance chamber 5 and the second aperture of the air inlet hole of the first resonance chamber 5 are smaller than the first aperture, and the size and quantity of the second aperture can be determined according to existing empirical formulas.

[0061] In order to ensure that the air outlet end of the air inlet pipe penetrates through the air inlet of the soundproof chamber without gaps, a sealing ring can be provided at the air inlet of the soundproof chamber, or the air outlet end of the air inlet pipe can be connected to the air inlet end of the soundproof chamber by welding or bonding.

[0062] The first baffle 4, the first expansion chamber 3, and the first resonance chamber 5 are all placed in the soundproof chamber 2. Among them, the air inlet of the first expansion chamber 3 is connected to the air outlet of the air inlet pipe 1, and the closed end of the first expansion chamber 3 penetrates through the first baffle 4 through the first through hole and is placed in the first through hole. In this way, the first expansion chamber 3 is firmly placed in the soundproof chamber 2.

[0063] The first end of the first resonance chamber 5 penetrates through the air outlet of the soundproof chamber 2 and is sleeved on the air outlet of the soundproof chamber 2, and the second end of the first resonance chamber 5 is in complete contact with the closed end of the first expansion chamber 3. In this way, the first resonance chamber 5 is firmly placed in the soundproof chamber 2.

[0064] In addition, in order for the first end of the first resonance chamber 5 to penetrate through the air outlet of the soundproof chamber 2 without gaps, similarly, a sealing ring can be provided at the air outlet.

[0065] Regardless of whether the second end of the first resonance chamber 5 is open or closed, the second end of the above-mentioned first resonance chamber 5 is in complete contact with the closed end of the first expansion chamber 3, which can ensure that sound waves can only be emitted from the air outlet of the first resonance chamber 5.

[0066] The muffler is generally installed at the exhaust pipe of the device to be sound-reduced. The gas discharged from the exhaust pipe of the device to be sound-reduced carries noises of different frequencies. The exhaust pipe conveys the noises together with the gas into the muffler, and then the muffler is used to achieve the purpose of sound-reducing the device to be sound-reduced.

[0067] In this embodiment, the working principle of the muffler is as follows: Sound waves of different frequencies enter the first expansion chamber 3 from the air inlet of the air inlet pipe 1 and are scattered in the first expansion chamber 3. Only the sound waves with frequencies close to the air outlet holes of the first expansion chamber 3 flow out as the first sound waves into the resonance cavity formed by the outer side wall of the first expansion chamber 3, the first baffle 4 and the inner side wall of the sound insulation chamber 2. The first sound waves in the resonance cavity will resonate and further consume the energy of the first sound waves. The sound waves with frequencies close to the air outlet holes of the first baffle 4 in the first sound waves with consumed energy enter the expansion cavity formed by the first baffle 4, the outer side wall of the first resonance chamber 5 and the inner side wall of the sound insulation chamber 2. That is, the second sound waves are further scattered in the expansion cavity, and the sound waves with frequencies close to the air inlet holes of the first resonance chamber 5 enter the first resonance chamber 5 as the third sound waves. That is, the third sound waves resonate in the first resonance chamber 5 and further consume energy, and the third sound waves after consuming energy flow out from the air outlet of the first resonance chamber 5.

[0068] It can be seen that the muffler provided by the embodiment of the present invention includes an air inlet pipe 1, a sound insulation chamber 2, a first expansion chamber 3, a first baffle 4 and a first resonance chamber 5. The air outlet end of the air inlet pipe 1 penetrates the air inlet of the sound insulation chamber 2 in a gapless manner and is installed on the sound insulation chamber 2 in a manner opposite to and communicated with the air inlet of the first expansion chamber 3; the closed end of the first expansion chamber 3 penetrates the first through hole of the first baffle 4 disposed inside the sound insulation chamber 2 and is placed inside the sound insulation chamber 2. One end of the first resonance chamber 5 with an air outlet serves as the first end and penetrates the air outlet of the sound insulation chamber 2 in a gapless manner, and the second end is in complete contact with the closed end of the first expansion chamber 3. Compared with the traditional muffler, in the embodiment of the present invention, sound insulation cotton is no longer used, but a first expansion chamber 3, a first baffle 4 and a first resonance chamber 5 are provided, so that sound waves of various frequencies are sequentially scattered and resonated through the space formed by the first expansion chamber 3, the first baffle 4, the first resonance chamber 5 and the sound insulation chamber 2 to achieve the purpose of consuming the energy of the sound waves. At the same time, the sound wave frequencies can be filtered one by one while consuming energy through the air outlet holes of the first expansion chamber 3, the air outlet holes of the first baffle 4 and the air inlet holes of the first resonance chamber 5, and then the purpose of sound reduction is achieved. It can be seen that on the basis of achieving sound reduction, the embodiment of the present invention is not restricted by the ambient temperature, and thus is not easily aged and deformed, thereby improving the service life of the muffler.

[0069] In one embodiment of the present invention for the case where a higher requirement for the sound reduction effect is required, the above-mentioned muffler may further include: a second baffle 6;

[0070] The second baffle 6 is provided with a second through hole that mates with the outer wall of the first resonance chamber 5, and an air outlet for guiding the gas to flow out;

[0071] Wherein, the second baffle 6 is disposed in the sound absorption chamber, the first end of the first resonance chamber 5 sequentially penetrates through the second through hole and the air outlet of the sound absorption chamber 2 in a gapless manner, and the gap between the second baffle 6 and the end of the sound absorption chamber 2 is filled with a sound absorption material 7.

[0072] The air outlet of the second baffle 6 and the air outlet of the first baffle 4 may be the same or different, and this embodiment does not limit this.

[0073] To ensure that the first end of the first resonance chamber 5 sequentially penetrates through the second through hole and the air outlet of the sound absorption chamber 2 in a gapless manner, a sealing ring may be provided at the second through hole of the second baffle 6 and the air outlet of the sound absorption chamber 2, so that when the first end of the first resonance chamber 5 penetrates through the second through hole and the air outlet of the sound absorption chamber 2, under the action of the sealing ring, it can be ensured that the first end of the first resonance chamber 5 penetrates through the second through hole and the air outlet of the sound absorption chamber 2 in a gapless manner.

[0074] It can be seen that the muffler of this embodiment may further include a second baffle 6. The second baffle 6 is disposed in the muffler cylinder. The first end of the first resonance chamber 5 sequentially penetrates through the second through hole and the air outlet of the sound absorption chamber 2 in a gapless manner, and the gap between the second baffle 6 and the end of the sound absorption chamber 2 is filled with a sound absorption material 7, so as to further improve the sound absorption effect of the muffler.

[0075] In the case of a higher requirement for the sound absorption effect, such as Figures 2 to 3 As shown, in an embodiment of the present invention, the muffler may further include a sound absorption component;

[0076] Wherein, the sound absorption component includes a second expansion chamber 8 having the same structure as the first expansion chamber 3, a third baffle 9, a fourth baffle 10, and a second resonance chamber 11 having the same structure as the first resonance chamber 5;

[0077] The third baffle 9 is provided with a third through hole that mates with the outer wall of the second expansion chamber 8, and an air outlet for guiding the gas to flow out;

[0078] The fourth baffle 10 is provided with a fourth through hole that mates with the outer wall of the second resonance chamber 11;

[0079] The second end of the second resonance chamber 11 is in complete contact with the closed end of the first expansion chamber 3. The first end of the second resonance chamber 11 penetrates through the fourth through-hole of the fourth baffle, and the air outlet of the first end is opposite to and communicated with the air inlet of the second expansion chamber 8. The closed end of the second expansion chamber 8 is in complete contact with the second end of the first resonance chamber 5, and the second expansion chamber 8 penetrates through the third through-hole of the third baffle 9 and is placed on the third baffle 9.

[0080] Among them, the second expansion chamber 8 in the above sound-absorbing component can adopt an expansion chamber with the same structure as the first expansion chamber 3 but different dimensions, or an expansion chamber with the same structure and the same dimensions as the first expansion chamber 3. Similarly, the second resonance chamber 11 in the above sound-absorbing component can adopt a resonance chamber with the same structure as the first resonance chamber 5 but different dimensions, or a resonance chamber with the same structure and the same dimensions as the first resonance chamber 5.

[0081] The third baffle 9 in the above sound-absorbing component can have the same structure as the first baffle 4 or the second baffle 6, or a different structure from the first baffle 4 or the second baffle 6. This embodiment does not limit this.

[0082] The fourth through-hole in the fourth baffle 10 in the above sound-absorbing component is only related to the outer wall shape of the second resonance chamber 11. When the second resonance chamber 11 is exactly the same as the first resonance chamber 5, the fourth through-hole is exactly the same as the second through-hole. When the second resonance chamber 11 has the same structure as the first resonance chamber 5 but different dimensions, the fourth through-hole is different from the second through-hole.

[0083] The second end of the second resonance chamber 11 being in complete contact with the closed end of the first expansion chamber 3 can ensure that no matter whether the second end of the second resonance chamber 11 is in an open or closed state, the sound wave flowing out of the air outlet hole of the first baffle 4 can only enter the second resonance chamber 11 through the air inlet hole of the second resonance chamber 11.

[0084] The air outlet of the first end of the second resonance chamber 11 is opposite to and communicated with the air inlet of the second expansion chamber 8. It can be understood that the air outlet of the first end of the second resonance chamber 11 is placed opposite to the air inlet of the second expansion chamber 8 and is in a communicated state. The communicated state between the air outlet of the second resonance chamber 11 and the air inlet of the second expansion chamber 8 can be direct communication or indirect communication. This embodiment does not limit this.

[0085] In this embodiment, the working principle of the silencer is as follows: Sound waves of different frequencies enter the first expansion chamber 3 from the air inlet of the air inlet pipe 1 and are scattered in the first expansion chamber 3. Only the sound waves with frequencies close to the outlet holes of the first expansion chamber 3 flow out as the first sound waves into the space formed by the outer wall of the first expansion chamber 3, the first baffle 4, and the inner wall of the sound insulation chamber 2, denoted as the first resonance cavity. The first sound waves in the first resonance cavity will resonate and further consume the energy of the first sound waves. The sound waves with frequencies close to the outlet holes of the first baffle 4 in the first sound waves with consumed energy enter the expansion cavity formed by the first baffle 4, the outer wall of the second resonance chamber 11, and the fourth baffle 10 as the second sound waves. The second sound waves are further scattered in the expansion cavity, and the sound waves with frequencies close to the air inlet holes of the second resonance chamber 11 enter the second resonance chamber 11 as the third sound waves. After the third sound waves resonate and consume energy in the second resonance chamber 11, they enter the second expansion chamber 8 from the second resonance chamber 11, and are further scattered in the second expansion chamber 8, and the sound waves with frequencies close to the outlet holes of the second expansion chamber 8 flow out as the fourth sound waves. The fourth sound waves enter the resonance cavity formed by the outer wall of the second expansion chamber 8, the third baffle 9, and the sound insulation chamber 2 to resonate and consume energy, and the fourth sound waves with frequencies close to the outlet holes of the third baffle 9 flow out from the outlet holes of the third baffle 9 as the fifth sound waves and flow into the expansion cavity formed by the third baffle 9, the outer wall of the first resonance chamber 5, and the sound insulation chamber 2. The fifth sound waves are further scattered in the expansion cavity, and the sound waves with frequencies close to the air inlet holes of the first resonance chamber 5 enter the first resonance chamber 5 as the fifth sound waves, that is, the fifth sound waves resonate in the first resonance chamber 5 to further consume energy, and the fifth sound waves after consuming energy flow out from the air outlet of the first resonance chamber 5.

[0086] It can be seen that the silencer of this embodiment further includes a sound insulation component. The second end of the second resonance chamber 11 of the sound insulation component is in complete contact with the closed end of the first expansion chamber 3. The first end of the second resonance chamber 11 of the sound insulation component penetrates the fourth through hole of the fourth baffle, and the air outlet of the first end is opposite to and communicated with the air inlet of the second expansion chamber 8. The closed end of the second expansion chamber 8 of the sound insulation component is in complete contact with the second end of the first resonance chamber 5, and the second expansion chamber 8 penetrates the third through hole of the third baffle 9 and is placed on the third baffle 9. It can be seen that in this embodiment, sound waves of various different frequencies are sequentially scattered and resonated through the space formed by the first expansion chamber 3, the first baffle 4, the sound insulation component, the first resonance chamber 5, the second baffle 6, and the sound insulation chamber 2 to achieve the purpose of further consuming the energy of the sound waves. At the same time, the sound wave frequencies are filtered one by one while consuming energy through the outlet holes of the first expansion chamber 3, the outlet holes of the first baffle 4, the air outlet and air inlet holes of the components in the sound insulation component, and the air inlet holes of the first resonance chamber 5, so as to achieve a further sound insulation purpose.

[0087] In order to further achieve a better sound attenuation effect, in an embodiment of the present invention, the above muffler may further include at least two sound attenuation components;

[0088] In each sound attenuation component, the air outlet at the first end of the second resonance chamber 11 penetrates through the fourth through hole of the fourth baffle and is opposite to and communicated with the air inlet of the second expansion chamber 8. The second expansion chamber 8 penetrates through the third through hole of the third baffle 9 and is placed on the third baffle 9;

[0089] The sound attenuation components are arranged in a row in contact with each other in sequence from head to tail. Among them, the second end of the second resonance chamber 11 in the sound attenuation component is in full contact with the closed end of the second expansion chamber 8 of the previous set of sound attenuation components, and the closed end of the second expansion chamber 8 of the sound attenuation component is in full contact with the second end of the second resonance chamber 11 of the next set of sound attenuation components;

[0090] The second end of the second resonance chamber 11 of the sound attenuation component ranked first is in full contact with the closed end of the first expansion chamber 3, and the closed end of the second expansion chamber 8 of the sound attenuation component ranked last is in full contact with the second end of the first resonance chamber 5.

[0091] Although the more sound attenuation components are provided, the better the noise reduction effect is, but for some application scenarios of the muffler, it is not necessarily the case that the more sound attenuation components are provided, the better. It is related to the actual application scenario of the muffler.

[0092] For example: When the muffler is installed on an engine, where the intake pipe 1 of the muffler is communicated with the exhaust pipe of the engine. At this time, there are two different situations for the muffler, specifically:

[0093] The first situation: When the volume of the sound attenuation chamber 2 remains unchanged, when the more sound attenuation components are provided, the volume of each cavity in the muffler will become smaller. In this way, the resistance of the exhaust back pressure of the engine is more, and at the same time, the exhaust speed is also slower, which will more affect the output power of the engine.

[0094] The second situation: When the volume of the sound attenuation chamber 2 is variable, when the more sound attenuation components are provided, the volume of the muffler itself increases. Not only does the occupied space of the muffler itself become larger and larger, but its own weight will also become larger and larger, which is likely to cause the overall weight of the muffler to exceed the standard.

[0095] Based on the above analysis, the setting of the sound attenuation components can be determined according to actual needs.

[0096] The above sound attenuation components are arranged in a row in contact with each other in sequence from head to tail. It can be understood that the sound attenuation components are arranged in contact with each other in sequence from head to tail, and the result presented is a row. In addition, the position of each sound attenuation component in the queue is not limited in this embodiment. To make it easier to understand the arrangement of the sound attenuation components in a row in contact with each other in sequence from head to tail, the following multiple examples are listed specifically:

[0097] Example 1: When the number of sound-absorbing components is two, these two sound-absorbing components are respectively denoted as sound-absorbing component 1 and sound-absorbing component 2. Sound-absorbing component 1 and sound-absorbing component 2 are arranged in a row, with sound-absorbing component 1 as the first sound-absorbing component and sound-absorbing component 2 as the last sound-absorbing component. Then, the second end of the second resonance chamber 11 of sound-absorbing component 1 is in full contact with the closed end of the first expansion chamber 3, and the closed end of the second expansion chamber 8 of sound-absorbing component 2 is in full contact with the second end of the first resonance chamber 5.

[0098] Example 2: When the number of sound-absorbing components is three, these three sound-absorbing components are respectively denoted as sound-absorbing component 1, sound-absorbing component 2, and sound-absorbing component 3. Sound-absorbing component 1, sound-absorbing component 2, and sound-absorbing component 3 are arranged in a row with their heads and tails in contact. Sound-absorbing component 1 is the first sound-absorbing component, sound-absorbing component 2 is the middle sound-absorbing component, and sound-absorbing component 3 is the last sound-absorbing component. Then, the previous sound-absorbing component of sound-absorbing component 2 is sound-absorbing component 1, and the next sound-absorbing component of sound-absorbing component 2 is sound-absorbing component 3. The second end of the second resonance chamber 11 in sound-absorbing component 2 is in full contact with the closed end of the second expansion chamber 8 of sound-absorbing component 1, and the closed end of the second expansion chamber 8 of sound-absorbing component 2 is in full contact with the second end of the second resonance chamber 11 of sound-absorbing component 3. Also, the second end of the second resonance chamber 11 of sound-absorbing component 1 is in full contact with the closed end of the first expansion chamber 3, and the closed end of the second expansion chamber 8 of sound-absorbing component 3 is in full contact with the second end of the first resonance chamber 5.

[0099] Example 3: When the number of sound-absorbing components is N, where N is an integer greater than 3, these N sound-absorbing components are respectively denoted as sound-absorbing component 1, ……, sound-absorbing component i, ……, sound-absorbing component N. i is any one of the N - 2 sound-absorbing components. Sound-absorbing component 1, ……, sound-absorbing component i, ……, sound-absorbing component N are arranged in a row with their heads and tails in contact. Sound-absorbing component 1 is the sound-absorbing component at the first position, sound-absorbing component i is the sound-absorbing component in the middle, and sound-absorbing component N is the sound-absorbing component at the last position. Then the previous sound-absorbing component of sound-absorbing component i is sound-absorbing component i - 1, and the next sound-absorbing component of sound-absorbing component i is sound-absorbing component i + 1. The second end of the second resonance chamber 11 in sound-absorbing component i is in full contact with the closed end of the second expansion chamber 8 of sound-absorbing component i - 1, and the closed end of the second expansion chamber 8 of sound-absorbing component i is in full contact with the second end of the second resonance chamber 11 of sound-absorbing component i + 1. By analogy, the second end of the second resonance chamber 11 of sound-absorbing component i - (i - 2) is in full contact with the closed end of the second expansion chamber 8 of sound-absorbing component 1, the closed end of the second expansion chamber 8 of sound-absorbing component i - (i - 2) is in full contact with the second end of the second resonance chamber 11 of sound-absorbing component i - (i - 3), the second end of the second resonance chamber 11 of sound-absorbing component i - (i - N + 1) is in full contact with the closed end of the second expansion chamber 8 of sound-absorbing component i - (i - N + 2), the closed end of the second expansion chamber 8 of sound-absorbing component i - (i - N + 1) is in full contact with the second end of the second resonance chamber 11 of sound-absorbing component N, and the second end of the second resonance chamber 11 of sound-absorbing component 1 is in full contact with the closed end of the first expansion chamber 3, and the closed end of the second expansion chamber 8 of sound-absorbing component N is in full contact with the second end of the first resonance chamber 5.

[0100] It can be seen that the muffler of this embodiment can further include at least two sound-absorbing components; in each sound-absorbing component, the air outlet at the first end of the second resonance chamber 11 penetrates through the fourth through-hole of the fourth baffle and is opposite to and communicated with the air inlet of the second expansion chamber 8. The second expansion chamber 8 penetrates through the third through-hole of the third baffle 9 and is placed on the third baffle 9; the sound-absorbing components are arranged in a row with their heads and tails in contact in sequence. Among them, the second end of the second resonance chamber 11 in the sound-absorbing component is in full contact with the closed end of the second expansion chamber 8 of the previous sound-absorbing component, and the closed end of the second expansion chamber 8 of the sound-absorbing component is in full contact with the second end of the second resonance chamber 11 of the next sound-absorbing component; the second end of the second resonance chamber 11 of the sound-absorbing component at the first position is in full contact with the closed end of the first expansion chamber 3, and the closed end of the second expansion chamber 8 of the sound-absorbing component at the last position is in full contact with the second end of the first resonance chamber 5; this can further improve the sound-absorbing effect.

[0101] Based on the above embodiments, in order to further improve the sound-absorbing effect, in one embodiment of the present invention, the muffler can further include at least one fifth baffle;

[0102] Wherein, the fifth baffle is provided with a fifth through hole that mates with the outer wall of the second expansion chamber 8, and an air outlet for guiding the outflow of gas;

[0103] The fifth baffle is sleeved on the closed end of the second expansion chamber 8 in at least one of the silencing components, and the gap between the third baffle 9 and the fifth baffle sleeved on the same second expansion chamber 8 is filled with a sound-absorbing material 7.

[0104] The above-mentioned fifth baffle may have the same structure as the first baffle 4, the second baffle 6 or the third baffle 9, or may have a different structure from the first baffle 4, the second baffle 6 or the third baffle 9. That is to say, the aperture of the air outlet in the fifth baffle may be the same as the aperture of the air outlet in the first baffle 4, the aperture of the air outlet in the second baffle 6, or the aperture of the air outlet in the third baffle 9, or may be different from the aperture of the air outlet in the first baffle 4, the aperture of the air outlet in the second baffle 6, or the aperture of the air outlet in the third baffle 9. This embodiment does not limit this.

[0105] The setting of the above-mentioned fifth baffle can be divided into two cases according to actual needs. The first case is: to minimize the noise of the muffler, the fifth baffle can be used as a component of the silencing component. That is to say, at this time, the silencing component can also include a fifth baffle;

[0106] In each silencing component, the fifth baffle is sleeved on the closed end of the second expansion chamber 8 in this silencing component through a first through hole, and the gap between the fifth baffle and the third baffle 9 in this silencing component is filled with a sound-absorbing material 7.

[0107] Wherein, the sound-absorbing material 7 in the above-mentioned silencing component is used to absorb the sound waves flowing out of the second expansion chamber 8 in this silencing component.

[0108] A sealing ring may be provided in the first through hole to make the first through hole of the fifth baffle fit more tightly with the second expansion chamber 8, so as to bring good sealing performance.

[0109] The second case is: according to the noise reduction requirements for the noise reduction equipment in the actual scenario, the fifth baffle can be sleeved on the closed end of the second expansion chamber 8 in some of the silencing components, and the gap between the third baffle 9 and the fifth baffle sleeved on the same second expansion chamber 8 is filled with a sound-absorbing material 7.

[0110] Wherein, the above-mentioned part of the silencing components, that is, the silencing components in which the second expansion chamber 8 in the silencing component is used to sleeve the fifth baffle, the number of this part of the silencing components is related to the noise reduction requirements for the noise reduction equipment in the actual scenario. For example, if the noise reduction requirement for the engine in the actual scenario is to reduce the noise by another 20 DB on the basis of the noise reduction of the original muffler, and each time a fifth baffle is set, the noise is reduced by 5 DB, then 4 DB can be set on the original basis.

[0111] In addition, the more the fifth baffles are provided, the better the noise reduction effect is. However, the exhaust backpressure resistance of the engine will also be greater, which will in turn affect the output power of the engine. Based on this, the setting of the fifth baffles is related to the requirements of the actual scenario, and the fifth baffles are set according to actual needs.

[0112] In one case, if the original muffler fails to meet the noise reduction requirements for the equipment to be noise-reduced, and the volume of the soundproof chamber 2 cannot remain unchanged, in an embodiment of the present invention, the fifth baffle is sleeved on the closed end of the second expansion chamber 8 in at least one sound absorption component, and the gap between the third baffle 9 and the fifth baffle sleeved on the same second expansion chamber 8 is filled with sound absorption material 7. In this way, without adding more sound absorption components in the soundproof chamber 2, the noise reduction requirements can be met.

[0113] In another case, if the original muffler fails to meet the noise reduction requirements for the equipment to be noise-reduced, and it is required that the output power of the equipment to be noise-reduced cannot be affected too much, but there is no restriction on the volume of the soundproof chamber 2, in an embodiment of the present invention, the above-mentioned sound absorption components can be added in the soundproof chamber 2 to meet the noise reduction requirements.

[0114] It can be seen that the muffler of this embodiment may further include at least one fifth baffle, the fifth baffle is sleeved on the closed end of the second expansion chamber 8 in at least one sound absorption component, and the gap between the third baffle 9 and the fifth baffle sleeved on the same second expansion chamber 8 is filled with sound absorption material 7. The sound absorption material 7 between the fifth baffle and the third baffle 9 can further absorb noise, thereby improving the soundproof effect.

[0115] In an embodiment of the present invention, the above-mentioned sound absorption material 7 can be selected as a high-temperature resistant sound absorption material 7, and these sound absorption materials 7 can be rock wool or glass wool.

[0116] Among them, the thermal conductivity of the rock wool material can reach 0.044, and it has characteristics such as fire prevention and non-combustibility.

[0117] Glass wool belongs to a type of glass fiber and is an artificial inorganic fiber. Glass wool is made by fibrillating molten glass into a cotton-like material. Its chemical composition belongs to the glass category and is an inorganic fiber. It has good forming properties, low bulk density, low thermal conductivity, good sound absorption performance, corrosion resistance, stable chemical properties, and can ensure a healthy environment. The internal fibers of centrifugal glass wool are fluffy and intertwined, with many fine pores, which is a typical porous sound absorption material 7 and has excellent sound absorption characteristics. Glass wool can withstand high temperatures up to 450 degrees.

[0118] It can be seen that the present embodiment selects rock wool or glass wool as the sound absorption material 7, which can not only achieve the soundproof effect in a high-temperature environment, but also extend the service life of the muffler.

[0119] The air outlet end of the intake air pipe 1 penetrates through the air inlet of the sound insulation chamber 2 in a gapless manner and is installed on the sound insulation chamber 2 through a reinforcing rib in a manner opposite to and communicating with the air inlet of the first expansion chamber 3.

[0120] In one embodiment of the present invention, the above-mentioned first aperture may be 10 mm, and / or, the above-mentioned second aperture may be 3 mm to 5 mm.

[0121] In this embodiment, there are the following several situations for the sizes of the first aperture and the second aperture:

[0122] The first situation is that when the first aperture is 10 mm, the second aperture may be 3 mm to 5 mm.

[0123] The second situation is that when the first aperture is 10 mm, the second aperture may be selected as an aperture less than 10 mm.

[0124] The third situation is that when the second aperture may be 3 mm to 5 mm, the first aperture may be selected as an aperture larger than the second aperture.

[0125] It can be seen that in this embodiment, when the first aperture may be 10 mm, and / or, the second aperture may be 3 mm to 5 mm, a good noise reduction effect can be achieved.

[0126] In one embodiment of the present invention, the material of the sound insulation chamber 2 may be selected as 304 stainless steel, or / and, the first baffle 4 may be selected as 409L stainless steel.

[0127] Among them, the density of 304 stainless steel is 7.93 g / cm³, which has characteristics such as high temperature resistance and corrosion resistance, can reach 800 °C, and has characteristics such as good processing performance and high toughness.

[0128] 409L has characteristics such as strong high temperature resistance and strong corrosion resistance. At the same time, it also has advantages such as low cost, good flexibility, high yield rate, and easy replacement, and belongs to an environmentally friendly new product.

[0129] In this embodiment, there are the following several situations for the sizes of the first aperture and the second aperture:

[0130] The first situation is that when the material of the sound insulation chamber 2 is selected as 304 stainless steel, the material of the first baffle 4 is selected as 409L stainless steel.

[0131] The second situation is that the material of the sound insulation chamber 2 is selected as 304 stainless steel.

[0132] The third situation is that the material of the first baffle 4 is selected as 409L stainless steel.

[0133] In addition, in an embodiment of the present invention, the outer shell of the anechoic chamber 2 can be made of 304 stainless steel with a thickness of 1 mm, and / or, the first baffle 4 is made of 409L stainless steel with a thickness of 2 mm

[0134] In addition, the materials of the second baffle 6, the third baffle 9, the fourth baffle 10 and the fifth baffle can be the same as that of the first baffle 4, or can be different from that of the first baffle 4. The embodiments of the present invention do not limit this

[0135] It can be seen that the material of the anechoic chamber 2 in this embodiment is made of 304 stainless steel, or / and, the first baffle 4 is made of 409L stainless steel. In view of the fact that both 304 stainless steel and 409L stainless steel have characteristics such as high temperature resistance and corrosion resistance, therefore, the anechoic chamber 2 in this embodiment can work in a high temperature environment and further can improve the service life

[0136] The embodiment of the present invention also provides an engine, and the engine includes: an engine main body and the muffler described in any one of the above embodiments

[0137] Wherein, the exhaust pipe of the engine main body is communicated with the intake pipe 1 of the muffler

[0138] One implementation manner for the exhaust pipe of the above engine main body to be communicated with the intake pipe 1 of the muffler is: the exhaust pipe is directly communicated with the intake pipe 1, and another implementation manner is: the exhaust pipe and the intake pipe 1 are communicated through a connecting piece

[0139] The gas discharged from the exhaust pipe carries noise, and the noise enters the first expansion chamber 3 through the air inlet of the intake pipe 1 of the muffler along with the gas, and then is gradually reduced in noise level through each component in the muffler until the first resonance chamber 5 outputs noise that meets the noise decibel requirements

[0140] It can be seen that the exhaust pipe of the engine main body in this embodiment is communicated with the intake pipe 1 of the muffler, and an engine with less output noise can be provided

[0141] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to this device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the device including the said element

[0142] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0143] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A muffler, characterized in that, it includes: an intake pipe (1), a silencing chamber (2), a first expansion chamber (3), a first baffle (4) and a first resonance chamber (5); wherein, the silencing chamber (2) is a cavity with an air inlet and an air outlet provided at both ends respectively; the first expansion chamber (3) is a cavity with an air inlet at one end and a closed end at the other end, and a plurality of air holes with a first aperture are provided on the outer side wall of the cavity of the first expansion chamber (3); the first baffle (4) is provided with a first through hole that matches the outer side wall of the first expansion chamber (3), and an air hole for guiding the outflow of gas; the first resonance chamber (5) is a cavity with an air outlet at one end, and an air inlet with a second aperture is provided on the outer side wall of the cavity of the first resonance chamber (5), wherein the second aperture is smaller than the first aperture; the air outlet end of the intake pipe (1) penetrates through the air inlet of the silencing chamber (2) in a gapless manner, and is installed on the silencing chamber (2) in a manner opposite to and communicating with the air inlet of the first expansion chamber (3); wherein, the closed end of the first expansion chamber (3) penetrates through the first through hole of the first baffle (4) and is placed on the first baffle (4), and the first baffle (4) is placed inside the silencing chamber (2); one end of the first resonance chamber (5) with an air outlet penetrates through the air outlet of the silencing chamber (2) in a gapless manner as the first end, and the second end is in complete contact with the closed end of the first expansion chamber (3); The intake pipe (1) is composed of two hollow structures with different cross-sections. Among them, the hollow structure with a larger cross-sectional area is provided with an air inlet for receiving sound waves, and the hollow structure with a smaller cross-sectional area is provided with an air outlet for transmitting sound waves.

2. The muffler according to claim 1, characterized in that, the muffler further includes: a second baffle (6); the second baffle (6) is provided with a second through hole that matches the outer side wall of the first resonance chamber (5), and an air hole for guiding the outflow of gas; wherein, the second baffle (6) is placed inside the silencing chamber (2), the first end of the first resonance chamber (5) penetrates through the second through hole and the air outlet of the silencing chamber (2) in a gapless manner in sequence, and the gap between the second baffle (6) and the end of the silencing chamber (2) is filled with a sound-absorbing material (7).

3. The muffler according to claim 2, characterized in that, the muffler further includes at least one silencing component; wherein, the silencing component includes a second expansion chamber (8) having the same structure as the first expansion chamber (3), a third baffle (9), a fourth baffle (10), and a second resonance chamber (11) having the same structure as the first resonance chamber (5); the third baffle (9) is provided with a third through hole that matches the outer side wall of the second expansion chamber (8), and an air hole for guiding the outflow of gas; the fourth baffle (10) is provided with a fourth through hole that matches the outer side wall of the second resonance chamber (11); The second end of the second resonance chamber (11) is in complete contact with the closed end of the first expansion chamber (3). The first end of the second resonance chamber (11) penetrates through the fourth through-hole of the fourth baffle (10), and the air outlet of the first end is opposite to and communicated with the air inlet of the second expansion chamber (8). The closed end of the second expansion chamber (8) is in complete contact with the second end of the first resonance chamber (5), and the second expansion chamber (8) penetrates through the third through-hole of the third baffle (9) and is placed on the third baffle (9).

4. The silencer according to claim 3, characterized in that, the silencer further comprises at least two sound-absorbing components; In each sound-absorbing component, the air outlet of the first end of the second resonance chamber (11) penetrates through the fourth through-hole of the fourth baffle (10), and is opposite to and communicated with the air inlet of the second expansion chamber (8). The second expansion chamber (8) penetrates through the third through-hole of the third baffle (9) and is placed on the third baffle (9); The sound-absorbing components are arranged in a row in contact with each other end to end. Among them, the second end of the second resonance chamber (11) in the sound-absorbing component is in complete contact with the closed end of the second expansion chamber (8) of the previous group of sound-absorbing components, and the closed end of the second expansion chamber (8) of the sound-absorbing component is in complete contact with the second end of the second resonance chamber (11) of the next group of sound-absorbing components; The second end of the second resonance chamber (11) of the sound-absorbing component ranked first is in complete contact with the closed end of the first expansion chamber (3), and the closed end of the second expansion chamber (8) of the sound-absorbing component ranked last is in complete contact with the second end of the first resonance chamber (5).

5. The silencer according to any one of claims 3 to 4, characterized in that, the silencer further comprises at least one fifth baffle; Among them, the fifth baffle is provided with a fifth through-hole matching with the outer side wall of the second expansion chamber (8) and an air outlet hole for guiding the gas to flow out; The fifth baffle is sleeved on the closed end part of the second expansion chamber (8) in at least one sound-absorbing component, and sound-absorbing material (7) is filled in the gap between the third baffle (9) and the fifth baffle sleeved on the same second expansion chamber (8).

6. The silencer according to claim 5, characterized in that, The sound-absorbing material (7) filled in the gap between the third baffle (9) and the fifth baffle sleeved on the same second expansion chamber (8) is rock wool or glass wool.

7. The silencer according to claim 2, characterized in that, The sound-absorbing material (7) filled in the gap between the second baffle (6) and the end of the sound-absorbing chamber (2) is rock wool or glass wool.

8. The silencer according to any one of claims 1 to 4, 6 to 7, characterized in that, The air outlet end of the air inlet pipe (1) penetrates through the air inlet of the sound-absorbing chamber (2) in a gapless manner and is installed on the sound-absorbing chamber (2) by a reinforcing rib in a manner opposite to and communicated with the air inlet of the first expansion chamber (3).

9. The silencer according to claim 1, characterized in that, The first aperture is 10 mm, and / or the second aperture is 3 mm to 5 mm.

10. The muffler according to claim 1, characterized in that, the material of the muffling chamber (2) is selected as 304 stainless steel, and / or, the first baffle (4) is selected as 409L stainless steel.

11. An engine, characterized in that, the engine comprises: an engine main body and the muffler according to any one of claims 1 to 10; wherein, an exhaust pipe of the engine main body is communicated with an air inlet pipe (1) of the muffler.

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