Exhaust silencer and hybrid vehicle thereof

Abstract

The utility model relates to the technical field of silencers, and discloses an exhaust silencer and a hybrid electric vehicle comprising the exhaust silencer. The rear silencer comprises an air inlet pipe, a second shell, a plurality of second partition plates, a second inner pipe, a third inner pipe, an inner insertion pipe and an air outlet pipe assembly. The second partition plates divide the interior of the second shell into a third cavity, a fourth cavity, a fifth cavity and a sixth cavity which are arranged at intervals in the second direction. One end of the air inlet pipe communicates with the front silencer, the other end of the air inlet pipe communicates with the fifth cavity, and the second inner pipe, the air outlet pipe assembly and the third inner pipe are sequentially arranged in the fifth cavity in the direction away from the air inlet pipe at intervals. The front silencer has the advantages that the front silencer can be conveniently installed at the bottom of a vehicle, and meanwhile the requirement for silencing complex and variable exhaust noise of a hybrid vehicle is met.

Description

Technical Field

[0001] The utility model relates to the technical field of mufflers, in particular to an exhaust muffler and a hybrid vehicle thereof. Background Art

[0002] When a car engine burns, it will produce exhaust noise, which will cause harm to the environment and people's work and life. Therefore, the car needs to be equipped with an exhaust muffler to eliminate or reduce the exhaust noise. In order to achieve better noise reduction performance, a front and rear two-stage muffler is usually designed at the bottom of the car, such as Figure 1 As shown in the figure, the front muffler of the existing traditional fuel vehicle adopts a central layout structure, the front muffler is set at the bottom of the car near the center line of the car body, and the rear muffler is set at the bottom of the car near the rear of the car. For PHEV hybrid vehicles, the added power battery occupies the middle position of the bottom of the car body. Due to the compact space under the car, there is no place to arrange the front muffler near the center line of the car body. Therefore, it is urgent to set up an exhaust muffler that can be suitable for PHEV hybrid vehicles.

[0003] In addition, automobile exhaust mufflers are divided into two categories: resistive mufflers and reactive mufflers. Resistive mufflers eliminate high-frequency noise by adding silencer cotton materials. Resistive mufflers can be divided into resonant mufflers and expansion mufflers, which are used to eliminate medium and low frequency noise. For PHEV hybrid vehicles, there is a condition where the engine charges the power battery, and the charging condition and charging load are frequently switched, resulting in complex and changeable exhaust noise. The existing exhaust muffler structure is relatively simple and cannot meet the noise reduction needs of PHEV hybrid vehicles. Utility Model Content

[0004] The purpose of the utility model is to provide an exhaust muffler and a hybrid vehicle thereof, which are convenient for installing the front muffler under the vehicle and meet the complex and changeable muffler requirements of the exhaust noise of the hybrid vehicle.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an exhaust muffler;

[0006] The rear muffler comprises an air inlet pipe, a second shell, a plurality of second baffles, a second inner pipe, a third inner pipe, an inner insert pipe and an air outlet pipe assembly;

[0007] A plurality of second baffles are provided in the second shell, and the plurality of second baffles divide the interior of the second shell into a third cavity, a fourth cavity, a fifth cavity, and a sixth cavity arranged at intervals along the second direction, the inner wall of the fifth cavity is provided with a second air inlet, and the inner wall of the third cavity is provided with a second air outlet;

[0008] One end of the air intake pipe is connected to the front muffler, and the other end is provided with the second air intake port and connected to the fifth cavity, and the second inner tube, the air outlet pipe assembly and the third inner tube are sequentially arranged in the fifth cavity in a direction away from the air intake pipe;

[0009] One end of the second inner tube and the third inner tube are both located in the fourth cavity, and the other ends thereof penetrate the fifth cavity and extend into the sixth cavity; one end of the air outlet pipe assembly is located in the sixth cavity, and the other end thereof penetrates the fifth cavity, the fourth cavity, and the third cavity in sequence along the second direction and extends to the second air outlet to communicate with the external environment;

[0010] One end of the inner tube is located in the third cavity, and the other end extends into the fourth cavity.

[0011] Furthermore, the air outlet pipe assembly is provided with sound-absorbing cotton; the second inner tube, the third inner tube, and the pipe section of the air outlet pipe assembly located in the fifth cavity are all provided with first through holes.

[0012] Furthermore, the front muffler includes a first shell, a first partition, and a first inner tube; the first partition is located in the first shell, and divides the interior of the first shell into a first cavity and a second cavity, the inner wall of the first cavity is provided with a first air inlet, the inner wall of the second cavity is provided with a first air outlet, one end of the first inner tube is arranged in the first cavity, and the other end of the first inner tube passes through the first cavity, the first partition and the second cavity in sequence, extends to the first air outlet and is connected with the air inlet pipe.

[0013] Furthermore, the tube walls of the first inner tube located in the first cavity and located in the second cavity are evenly distributed with second through holes, and the sound-absorbing cotton is filled between the inner wall of the first cavity and the tube wall of the first inner tube.

[0014] Furthermore, it also includes a first connecting pipe, a second connecting pipe and a third connecting pipe, one end of the first connecting pipe is arranged at the first air inlet and connected to the first inner pipe, one end of the second connecting pipe is arranged at the first air outlet and connected to the first inner pipe, the other end is connected to one end of the third connecting pipe, and the other end of the third connecting pipe is connected to the air inlet pipe.

[0015] Furthermore, the air outlet pipe assembly includes a first pipe segment and a second pipe segment, one end of the first pipe segment is located in the sixth cavity, the other end of the first pipe segment extends to the fourth cavity and is connected with the second pipe segment, the tube wall of the first pipe segment is provided with the first through hole, the second pipe segment extends to the second air outlet and is connected with the external environment, and the second pipe segment is filled with the sound-absorbing cotton.

[0016] Furthermore, the lengths of the sixth cavity, the fifth cavity, the third cavity and the fourth cavity along the second direction decrease sequentially.

[0017] Furthermore, a conical air inlet is provided at the end of the air outlet pipe assembly extending to the sixth cavity.

[0018] Furthermore, the included angle between the generatrix of the conical air inlet and the axis is 30°-60°.

[0019] The present application also provides a hybrid vehicle, comprising any one of the exhaust mufflers described above, and also comprising a power battery, wherein the front muffler is arranged on one side of the power battery along the length direction of the hybrid vehicle.

[0020] Compared with the prior art, the utility model embodiment of an exhaust muffler and a hybrid vehicle thereof have the following beneficial effects: the rear muffler includes a third cavity, a fourth cavity, a fifth cavity and a sixth cavity, and the airflow enters the fifth cavity via the intake pipe, wherein one airflow flows into the fourth cavity through the second inner tube, and then flows back through the third inner tube into the sixth cavity and flows out from the outlet pipe, and another airflow flows into the sixth cavity through the second inner tube and flows directly out from the outlet pipe assembly; the second inner tube, the third inner tube, and the outlet pipe assembly are located in the fifth cavity to form a multi-path airflow that surrounds the fifth cavity, The fifth cavity forms a multi-tube labyrinth silencing structure, which can eliminate medium and low frequency noise; in addition, the airflow in the fourth cavity enters the third cavity through the inner tube, and the inner tube and the third cavity form a Helmholtz silencing structure, which can eliminate low frequency noise; moreover, the airflow continuously expands in and out of the fourth cavity and the sixth cavity through the second inner tube, the third inner tube and the outlet pipe, and the fourth cavity and the sixth cavity form an expansion silencing structure, which can eliminate medium and low frequency noise, and the outlet pipe assembly is used to eliminate high frequency noise, and a variety of silencing structures are set to meet the complex and changeable silencing requirements of hybrid vehicle exhaust noise. Compared with the prior art, the hybrid vehicle provided by the utility model of the present application has the beneficial effect that the front muffler is arranged on one side of the power battery along the length direction of the hybrid vehicle, so as to avoid interference with the installation position of the power battery, and can be applied to the hybrid vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an exhaust muffler in the prior art;

[0022] Figure 2 It is a schematic diagram of the structure of the exhaust muffler of the embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the assembly of the front muffler of the exhaust muffler of the embodiment of the utility model;

[0024] Figure 4It is a schematic diagram of the internal structure of the front muffler of the exhaust muffler of the embodiment of the utility model;

[0025] Figure 5 It is a schematic structural diagram of a rear muffler of an exhaust muffler according to an embodiment of the utility model;

[0026] Figure 6 It is an airflow path diagram of the rear muffler of the exhaust muffler according to an embodiment of the utility model.

[0027] In the figure, 1, front muffler; 11, first shell; 110, first cavity; 111, second cavity; 112, first air inlet; 113, first air outlet; 12, first baffle; 13, first inner tube; 131, second through hole; 14, silencer cotton;

[0028] 2. rear muffler; 200. second air inlet; 201. second air outlet; 21. air inlet pipe; 22. second shell; 23. second baffle; 24. second inner pipe; 25. third inner pipe; 26. inner insert; 27. air outlet pipe assembly; 271. first pipe section; 272. second pipe section; 273. conical air inlet;

[0029] 3. The third cavity; 4. The fourth cavity; 5. The fifth cavity; 6. The sixth cavity; 7. The first through hole;

[0030] 81. first connecting tube; 82. second connecting tube; 83. third connecting tube; 84. hook; 85. hanging rubber; 86. flange; X, first direction; Y, second direction; a, center line of vehicle body; b, power battery. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. used in the present invention to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices and elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0034] The utility model provides a hybrid vehicle, including an exhaust muffler and a power battery B, such as Figure 2 As shown, in a preferred embodiment of the present invention, the exhaust muffler includes a front muffler 1 and a rear muffler 2, and the front muffler 1 is arranged on one side of the power battery b along the length direction of the hybrid vehicle. Figure 2 The front muffler 1 is arranged away from the center line a of the vehicle body and close to the side edge of the vehicle body, and is spaced apart from the rear muffler 2 along the first direction X. The front muffler 1 and the rear muffler 2 are arranged in an "L"-shaped offset structure as a whole, which can avoid interference with the power battery b during installation, and is suitable for existing hybrid vehicles. Specifically, the first direction X in this embodiment is the length direction of the hybrid vehicle body.

[0035] Furthermore, the front muffler 1 has a small muffler volume and is an auxiliary muffler. Figure 3 , Figure 4 The front muffler 1 includes a first shell 11, a first baffle 12, a first inner tube 13 and a muffler 14; specifically, the first shell 11 is hollow inside. In order to eliminate intermediate frequency noise and high frequency noise, the first baffle 12 is located inside the first shell 11, and the first shell 11 is divided into a first cavity 110 and a second cavity 111. The inner wall of the first cavity 110 is provided with a first air inlet 112, and the inner wall of the second cavity 111 is provided with a first air outlet 11 3. To simplify the structure, one end of the first inner tube 13 is arranged in the first cavity 110, and the other end of the first inner tube 13 sequentially passes through the first cavity 110, the first baffle 12 and the second cavity 111 to extend to the first gas outlet 113 and communicate with the air inlet pipe 21, and the first inner tube 13 located in the first cavity 110 and the tube wall of the second cavity 111 are uniformly provided with second through holes 131, and the sound-absorbing cotton 14 is filled between the inner wall of the first cavity 110 and the tube wall of the first inner tube 13. Among them, the gas enters the first cavity 110 from the first inner tube 13 through the second through holes 131, and the first cavity 110 is filled with the sound-absorbing cotton 14, forming a resistive sound-absorbing structure, which can eliminate high-frequency noise. Since the tube wall of the first inner tube 13 is uniformly provided with second through holes 131, the second cavity 111 forms a porous resonant sound-absorbing structure, which can eliminate medium-frequency noise. The front muffler 1 integrates two structures, namely, resistive muffler and porous resonance muffler, which broadens the muffler frequency range of the front muffler 1 and enables it to have a higher muffler effect in the medium-frequency and high-frequency muffler frequency ranges.

[0036] Furthermore, the rear muffler 2 has a large muffler volume and is the main muffler. In order to meet the problem of frequent switching of the vehicle engine working conditions and complex and changeable exhaust noise, in this embodiment, refer to Figure 5 , Figure 6 The rear muffler 2 includes an air inlet pipe 21, a second shell 22, a plurality of second baffles 23, a second inner tube 24, a third inner tube 25, an inner tube 26 and an air outlet pipe assembly 27; the rear muffler 2 is a multi-structure full-function broadband muffler, which can achieve a good muffler effect in the low frequency, medium frequency and high frequency broadband frequency range. Specifically, the interior of the second shell 22 is hollow, and a plurality of second baffles 23 divide the interior of the second shell 22 into a third cavity 3, a fourth cavity 4, a fifth cavity 5 and a sixth cavity 6 arranged at intervals along the second direction Y; wherein the inner wall of the fifth cavity 5 is provided with a second air inlet 200, the inner wall of the third cavity 3 is provided with a second air outlet 201, one end of the air inlet pipe 21 is connected to the front muffler 1, and the other end is provided with a second air inlet 200 connected to the fifth cavity 5, and the fifth cavity 5 A second inner tube 24, an air outlet pipe assembly 27 and a third inner tube 25 are arranged in sequence along the inner edge in a direction away from the air inlet pipe 21; one end of the second inner tube 24 and the third inner tube 25 are both located in the fourth cavity 4, and the other ends both penetrate the fifth cavity 5 and extend into the sixth cavity 6; the walls of the pipe sections of the second inner tube 24, the third inner tube 25 and the air outlet pipe assembly 27 located in the fifth cavity 5 are uniformly provided with first through holes 7; one end of the air outlet pipe assembly 27 is located in the sixth cavity 6, and the other end penetrates the fifth cavity 5, the fourth cavity 4 and the third cavity 3 in sequence along the second direction Y and extends to the second air outlet 201 to communicate with the external environment; the air outlet pipe assembly 27 is filled with sound-absorbing cotton, one end of the inner tube 26 is located in the third cavity 3, and the other end extends into the fourth cavity 4, so that the airflow can be guided from the fourth cavity 4 into the third cavity 3.

[0037] Specifically, in the present embodiment, the second direction Y is the body width direction of the hybrid vehicle, so that the rear muffler is placed horizontally at the rear of the vehicle body, thereby rationally utilizing the space of the vehicle body and improving the utilization rate of the vehicle body space; in other embodiments, according to the arrangement of the rear muffler by those skilled in the art, the second direction Y may be the body length direction of the hybrid vehicle or a direction inclined to the body length direction of the hybrid vehicle.

[0038] For an explanation of the airflow path in the rear muffler, see Figure 6The third cavity 3 is a Helmholtz resonance silencing structure, which is used to eliminate low-frequency noise. Its airflow path is as follows: the airflow entering the fourth cavity 4 enters the third cavity 3 through the inner tube 26, and the airflow vibrates back and forth in the third cavity 3 to consume sound energy to achieve the silencing effect. The fifth cavity 5 is a multi-tube labyrinth silencing structure, which is used to eliminate medium and low-frequency noise. Its airflow path is as follows: the airflow enters the fifth cavity 5 through the air inlet pipe 21, wherein one airflow flows into the fourth cavity 4 through the second inner tube 24, and then flows back through the third inner tube 25 into the sixth cavity 6 and flows out from the air outlet pipe, and the other airflow flows into the sixth cavity 6 through the second inner tube 24 and flows out directly from the air outlet pipe assembly 27. The pipe walls of the second inner tube 24, the third inner tube 25, and the air outlet pipe assembly 27 located in the fifth cavity 5 are uniformly provided with first through holes 7, and multiple airflows surround in the fifth cavity 5, forming a multi-tube labyrinth silencing structure in the fifth cavity 5. The fourth cavity 4 and the sixth cavity 6 form an expansion silencer structure, which can eliminate medium and low frequency noise. The airflow path is: the airflow continuously expands in and out of the fourth cavity 4 and the sixth cavity 6 through the second inner tube 24, the third inner tube 25 and the outlet pipe, forming an expansion silencer structure. In order to eliminate high-frequency noise, the airflow must finally enter the sixth cavity 6 and be led out from the outlet pipe assembly 27. Therefore, silencer cotton is provided in the outlet pipe assembly 27 to eliminate high-frequency noise. The rear muffler 2 has a variety of silencer structures, integrating a variety of silencer structures such as Helmholtz resonance silencer, expansion silencer, multi-tube labyrinth silencer and resistive silencer, which can effectively deal with the problems of frequent switching of hybrid vehicle engine working conditions and complex and changeable exhaust noise.

[0039] Further, in order to facilitate the connection between the front muffler 1 and the rear muffler 2, in this embodiment, refer to Figure 3 The exhaust muffler further includes a first connecting pipe 81, a second connecting pipe 82 and a third connecting pipe 83, wherein one end of the first connecting pipe 81 is arranged at the first air inlet 112 and communicates with the first inner pipe 13, one end of the second connecting pipe 82 is arranged at the first air outlet 113 and communicates with the first inner pipe 13, and the other end is communicated with one end of the third connecting pipe 83, and the other end of the third connecting pipe 83 is communicated with the air inlet pipe 21. Furthermore, in order to facilitate the fixing of the exhaust muffler to the bottom of the vehicle, the outer walls of the second connecting pipe 82 and the third connecting pipe 83 are both provided with hooks 84, and the hooks 84 are provided with hanging glue 85. Furthermore, in order to facilitate the fixing and mutual communication between the second connecting pipe 82 and the third connecting pipe 83, the second connecting pipe 82 and the third connecting pipe 83 are connected by a flange 86.

[0040] Furthermore, in order to facilitate the design of the air outlet pipe assembly 27, in this embodiment, refer to Figure 5The air outlet pipe assembly 27 includes a first pipe section 271 and a second pipe section 272. One end of the first pipe section 271 is located in the sixth cavity 6, and the other end of the first pipe section 271 extends to the fourth cavity 4 and is connected with the second pipe section 272. A first through hole 7 is opened in the wall of the first pipe section 271. The second pipe section 272 extends to the second air outlet 201 and is connected with the external environment. The second pipe section 272 is filled with sound-absorbing cotton.

[0041] Furthermore, in order to facilitate the reasonable arrangement of the volumes of the cavities in the rear muffler 2 to achieve a better muffler effect, in this embodiment, the lengths of the sixth cavity 6, the fifth cavity 5, the third cavity 3, and the fourth cavity 4 extending along the second direction Y are successively reduced, and can be adjusted according to actual noise reduction requirements. Furthermore, in order to facilitate the setting of the diameter of the inner tube 26 and the diameter of the second inner tube 24 to achieve a better muffler effect, in this embodiment, the diameter of the inner tube 26 is smaller than the diameter of the second inner tube 24.

[0042] Furthermore, in order to facilitate the introduction of the airflow in the sixth cavity 6 into the air outlet pipe assembly 27 for discharge, in the present embodiment, a conical air inlet 273 is provided at the end of the air outlet pipe assembly 27 located in the sixth cavity 6, that is, a conical air inlet 273 is provided at one end of the first pipe section 271 located in the sixth cavity 6. Preferably, the angle between the generatrix of the conical air inlet 273 and the axis is 30°-60°, which is convenient for guiding the airflow.

[0043] In summary, the embodiment of the utility model provides an exhaust muffler, the rear muffler 2 includes a third cavity 3, a fourth cavity 4, a fifth cavity 5 and a sixth cavity 6, the airflow enters the fifth cavity 5 through the air inlet pipe 21, wherein one airflow flows into the fourth cavity 4 through the second inner tube 24, and then flows back into the sixth cavity 6 by the third inner tube 25 and flows out from the outlet pipe, and another airflow flows into the sixth cavity 6 through the second inner tube 24 and flows out directly from the outlet pipe assembly 27, the pipe sections of the second inner tube 24, the third inner tube 25 and the outlet pipe assembly 27 located in the fifth cavity 5 are evenly provided with ventilation holes, and multiple airflows surround the fifth cavity 5, and the fifth cavity The body 5 forms a multi-tube labyrinth silencing structure, which can eliminate medium and low frequency noise; in addition, the airflow in the fourth cavity 4 enters the third cavity 3 through the inner insert tube 26, and the inner insert tube 26 and the third cavity 3 form a Helmholtz silencing structure, which can eliminate low frequency noise; moreover, the airflow continuously expands in and out of the fourth cavity 4 and the sixth cavity 6 through the second inner tube 24, the third inner tube 25 and the outlet pipe, and the fourth cavity 4 and the sixth cavity 6 form an expansion silencing structure, which can eliminate medium and low frequency noise, and the outlet pipe assembly 27 is provided with silencing cotton for eliminating high frequency noise, and a variety of silencing structures are provided to meet the complex and changeable silencing requirements of hybrid vehicle exhaust noise. The utility model of the present application provides a hybrid vehicle, in which the front muffler 1 is arranged on one side of the power battery b along the length direction of the hybrid vehicle, so as to avoid interference with the installation position of the power battery b, and can be applied to the hybrid vehicle.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An exhaust muffler, characterized in that: Includes front and rear mufflers; The rear muffler comprises an air inlet pipe, a second shell, a plurality of second baffles, a second inner pipe, a third inner pipe, an inner insert pipe and an air outlet pipe assembly; A plurality of second baffles are provided in the second shell, and the plurality of second baffles divide the interior of the second shell into a third cavity, a fourth cavity, a fifth cavity, and a sixth cavity arranged at intervals along the second direction, the inner wall of the fifth cavity is provided with a second air inlet, and the inner wall of the third cavity is provided with a second air outlet; One end of the air intake pipe is connected to the front muffler, and the other end is provided with the second air intake port and connected to the fifth cavity, and the second inner tube, the air outlet pipe assembly and the third inner tube are sequentially arranged in the fifth cavity in a direction away from the air intake pipe; One end of the second inner tube and the third inner tube are both located in the fourth cavity, and the other ends thereof penetrate the fifth cavity and extend into the sixth cavity; one end of the air outlet pipe assembly is located in the sixth cavity, and the other end thereof penetrates the fifth cavity, the fourth cavity, and the third cavity in sequence along the second direction and extends to the second air outlet to communicate with the external environment; One end of the inner tube is located in the third cavity, and the other end extends into the fourth cavity.

2. The exhaust muffler according to claim 1, characterized in that :Silence cotton is arranged in the air outlet pipe assembly; the second inner tube, the third inner tube, and the pipe section of the air outlet pipe assembly located in the fifth cavity are all provided with first through holes on their walls.

3. The exhaust muffler according to claim 1, characterized in that :The front muffler includes a first shell, a first partition, and a first inner tube; the first partition is located in the first shell, and divides the interior of the first shell into a first cavity and a second cavity, the inner wall of the first cavity is provided with a first air inlet, the inner wall of the second cavity is provided with a first air outlet, one end of the first inner tube is arranged at the first air inlet, and the other end of the first inner tube passes through the first cavity, the first partition and the second cavity in sequence, extends to the first air outlet and is connected with the air inlet pipe.

4. The exhaust muffler according to claim 3, characterized in that :Silence cotton is provided in the first cavity, the first inner tube is located in the first cavity and the tube wall of the second cavity is evenly distributed with second through holes, and the silence cotton is filled between the inner wall of the first cavity and the tube wall of the first inner tube.

5. The exhaust muffler according to claim 3, characterized in that: It also includes a first connecting pipe, a second connecting pipe and a third connecting pipe, wherein one end of the first connecting pipe is arranged at the first air inlet and communicates with the first inner pipe, one end of the second connecting pipe is arranged at the first air outlet and communicates with the first inner pipe, and the other end is communicated with one end of the third connecting pipe, and the other end of the third connecting pipe is communicated with the air inlet pipe.

6. The exhaust muffler according to claim 2, characterized in that: The air outlet pipe assembly includes a first pipe section and a second pipe section, one end of the first pipe section is located in the sixth cavity, the other end of the first pipe section extends to the fourth cavity and is connected with the second pipe section, the first through hole is opened in the tube wall of the first pipe section, the second pipe section extends to the second air outlet and is connected with the external environment, and the second pipe section is filled with the sound-absorbing cotton.

7. The exhaust muffler according to claim 1, characterized in that: The lengths of the sixth cavity, the fifth cavity, the third cavity, and the fourth cavity extending along the second direction decrease sequentially.

8. The exhaust muffler according to claim 1, characterized in that: The end of the air outlet pipe assembly extending to the sixth cavity is provided with a tapered air inlet.

9. The exhaust muffler according to claim 8, characterized in that: The included angle between the generatrix of the conical air inlet and the axis is 30°-60°.

10. A hybrid vehicle, comprising the exhaust muffler according to any one of claims 1 to 9, characterized in that: It also includes a power battery, and the front muffler is arranged on one side of the power battery along the length direction of the hybrid vehicle.

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