Air inlet system and vehicle

Abstract

According to the technical scheme, the air inlet system is used for being connected with an engine, the air inlet system comprises a first air inlet pipe, a second air inlet pipe and a first silencing pipe, and the first air inlet pipe is used for being communicated with the outside atmosphere; the second air inlet pipe is provided with a first air inlet and a first air outlet; the first air outlet is connected with an engine; the second air inlet and the second air outlet are communicated with the expansion cavity, the second air inlet is communicated with the first air inlet pipe, the second air outlet is communicated with the first air inlet, a reference plane is defined to be perpendicular to the axis direction of the first air inlet, and the sectional area, cut by the reference plane, of the expansion cavity is larger than the sectional area of the first air inlet. According to the technical scheme, the silencing capacity of the air inlet system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to an air intake system and a vehicle. Background Art

[0002] The high-position air intake system is mainly used in light trucks, heavy trucks and other vehicles. It consists of a high-position air intake pipe, a corrugated rubber tube, an air filter, an air intake pipe, etc. Since the air intake system is directly connected to the engine and the air intake port and the air intake pipe are closer to the cab, the air intake system can easily cause noise problems in the cab. Utility Model Content

[0003] The main purpose of the utility model is to provide an air intake system, aiming to improve the noise reduction capability of the air intake system.

[0004] The technical solution of the utility model provides an intake system for connecting to an engine, the intake system comprising:

[0005] A first air inlet pipe, used for communicating with the outside atmosphere;

[0006] A second air intake pipe having a first air intake port and a first air outlet, wherein the first air outlet is used for connecting to the engine;

[0007] The first silencer has an expansion cavity and a second air inlet and a second air outlet connected to the expansion cavity, the second air inlet is connected to the first air inlet pipe, the second air outlet is connected to the first air inlet, and a reference plane is defined perpendicular to the axial direction of the first air inlet, and the cross-sectional area of ​​the expansion cavity cut by the reference plane is larger than the cross-sectional area of ​​the first air inlet.

[0008] In one embodiment, the first muffler pipe includes a first pipe portion and a second pipe portion connected to each other, the first pipe portion forms the expansion cavity, and the second pipe portion forms a first resonance cavity communicating with the expansion cavity.

[0009] In one embodiment, the second pipe portion intersects with the first pipe portion and is connected to an end of the first pipe portion away from the first air inlet, and the second pipe portion and the second air inlet pipe are arranged side by side on the same side of the first pipe portion.

[0010] In one embodiment, the first air inlet is an oblique inlet, and the opening direction of the oblique inlet is toward the first resonant cavity;

[0011] And / or, the first pipe part has a mounting end face away from the second pipe part and a mounting side face connected to the mounting end face, the second air inlet is arranged on the mounting end face, and the second air outlet is arranged on the mounting side face and adjacent to the second air inlet.

[0012] In one embodiment, a plurality of reinforcement structures are provided at intervals on the outer surface of the first muffler pipe and / or the first air inlet pipe.

[0013] In one embodiment, the reinforcement structure is configured as a groove.

[0014] In one embodiment, the air intake system further includes an air filter, a first connecting pipe and a second connecting pipe, the air filter is connected to the second air intake port through the first connecting pipe, and is connected to the first air intake pipe through the second connecting pipe.

[0015] In one embodiment, a sound absorbing material is disposed inside the air filter.

[0016] In one embodiment, the air intake system further includes a bellows disposed between the second connecting pipe and the first air intake pipe, and the second connecting pipe is connected to the first air intake pipe through the bellows.

[0017] In one embodiment, the air intake system further includes a second muffler disposed on the outside of the first air intake pipe, the second muffler having a second resonance cavity, the second resonance cavity being connected to an end of the first air intake pipe close to the second connecting pipe and extending along the length direction of the first air intake pipe.

[0018] The utility model also provides a vehicle, comprising the above-mentioned air intake system.

[0019] The technical solution of the utility model is to arrange a first silencer at the first air inlet of the second air inlet pipe, and the cross-sectional area of ​​the expansion cavity of the first silencer cut by the reference plane is larger than the cross-sectional area of ​​the first air inlet, so that when the noise sound waves generated by the engine enter the expansion cavity from the first air inlet, the cross-sectional area of ​​the first silencer in the axial direction of the first air inlet suddenly expands, causing the sound waves to oscillate back and forth (reflection, superposition, interference) during the transmission process, so as to achieve the effect of silencer, thereby improving the silencer capacity of the air intake system, achieving the function of significantly reducing noise, and improving the NVH performance of the cab. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of an air intake system in one embodiment of the utility model;

[0022] Figure 2for Figure 1 A cross-sectional view of the second air intake pipe and the first muffler.

[0023] Description of Figure Numbers:

[0024] Label name Label name 10 Air Intake System 210 First air inlet 100 First intake pipe 220 First air outlet 200 Second intake pipe 310 First pipe department 300 First silencer 311 Expansion cavity 400 Air filter 312 Second air inlet 500 First connecting pipe 313 Second air outlet 600 Second connecting pipe 314 Mounting end face 700 Bellows 315 Installation side 800 Second silencer 320 Second pipe 900 Strengthening the structure 321 The first resonant cavity

[0025] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0029] Please refer to Figure 1 and Figure 2The utility model proposes an intake system 10 for connecting to an engine. The intake system 10 includes a first intake pipe 100, a second intake pipe 200 and a first muffler 300. The first intake pipe 100 is used to communicate with the outside atmosphere; the second intake pipe 200 has a first air inlet 210 and a first air outlet 220, and the first air outlet 220 is used to connect to the engine; the first muffler 300 has an expansion cavity 311 and a second air inlet 312 and a second air outlet 313 connected to the expansion cavity 311, the second air inlet 312 is connected to the first intake pipe 100, and the second air outlet 313 is connected to the first air inlet 210, and a reference plane is defined that is perpendicular to the axial direction of the first air inlet 210, and the cross-sectional area of ​​the expansion cavity 311 cut by the reference plane is larger than the cross-sectional area of ​​the first air inlet 210.

[0030] Specifically, the air intake system 10 is mainly used in light trucks, heavy trucks and other vehicles. The air intake system 10 includes a first air intake pipe 100 and a first muffler 300. The outside air enters from the first air intake pipe 100 and enters the engine from the second air intake pipe 200. On the contrary, the noise generated by the engine is transmitted from the second air intake pipe 200 to the first air intake pipe 100. Since the installation position of the first air intake pipe 100 is generally close to the cab, the cab noise is relatively large, which seriously affects the physical and mental health of the driver and the driving comfort.

[0031] Therefore, the air intake system 10 of the utility model further includes a first muffler 300, a second air intake port 312 of the first muffler 300 is used to communicate with the first air intake pipe 100, and a second air outlet port 313 of the first muffler 300 is communicated with the first air intake pipe 100 of the second air intake pipe 200. The outside air enters from the first air intake pipe 100 and passes through the first muffler 300 and the second air intake pipe 200 in sequence before entering the engine; conversely, the noise generated by the engine enters from the second air intake pipe 200, passes through the first muffler 300, and is transmitted from the first air intake pipe 100 to the air.

[0032] When the noise sound wave is transmitted from the first air inlet 210 to the expansion chamber 311, since the cross-sectional area of ​​the expansion chamber 311 cut by the reference plane is larger than the cross-sectional area of ​​the first air inlet 210, the noise sound wave suddenly enters the expansion chamber 311 with a larger cross-sectional area cut by the reference plane from the first air inlet 210 with a smaller cross-sectional area. The noise sound wave will oscillate back and forth (reflect, superimpose, interfere) in the expansion chamber 311 to achieve the effect of sound elimination, thereby effectively improving the sound elimination ability of the air intake system 10, enabling the air intake system 10 to significantly reduce noise, thereby significantly reducing the noise in the cab to improve driving comfort.

[0033] In addition, in order to increase the stability of the connection of the intake system 10, the first muffler 300 is also provided with a mounting structure, through which the first muffler 300 can be stably mounted on the vehicle frame to prevent the first muffler 300 from shaking and affecting the muffler effect, and also to prevent the first muffler 300 from interfering with or colliding with other parts. The mounting structure can be provided with mounting holes and locked by bolts; or the first muffler 300 can be fixed to the vehicle frame by welding.

[0034] The technical solution of the utility model is to set a first silencer 300 at the first air inlet 210 of the second air inlet pipe 200, and the cross-sectional area of ​​the expansion cavity 311 of the first silencer 300 cut by the reference plane is larger than the cross-sectional area of ​​the first air inlet 210, so that when the noise sound waves generated by the engine enter the expansion cavity 311 from the first air inlet 210, the cross-sectional area of ​​the first silencer 300 in the axial direction of the first air inlet 210 suddenly expands, so that the sound waves oscillate back and forth (reflection, superposition, interference) during the transmission process, so as to achieve the effect of silencer, thereby improving the silencer ability of the intake system 10, achieving the function of significantly reducing noise, and improving the NVH performance of the cab.

[0035] In one embodiment, the first muffler 300 includes a first pipe portion 310 and a second pipe portion 320 connected to each other. The first pipe portion 310 is formed with an expansion cavity 311 , and the second pipe portion 320 is formed with a first resonance cavity 321 communicating with the expansion cavity 311 .

[0036] Please refer to Figure 1 and Figure 2 The second tube part 320 can be arranged side by side with the first tube part 310, or the second tube part 320 can be arranged in parallel with the first tube part 310, the second tube part 320 is arranged on one side of the first tube part 310 and intersects with the first tube part 310, or the second tube part 320 is arranged at one end of the first tube part 310, and the extension direction of the second tube part 320 and the first tube part 310 is consistent. After the noise sound wave enters the expansion cavity 311, the first silencing is performed, and part of the sound wave resonates inside the first resonant cavity 321 after entering it, so that most of the energy is converted into heat energy, thereby achieving the purpose of noise reduction and realizing the second silencing. Under the joint action of the expansion cavity 311 and the first resonant cavity 321, the noise sound wave is greatly reduced. The shape of the expansion cavity 311 can be circular, elliptical, square or other shapes. The length and diameter or width of the first resonant cavity 321 can also be designed as needed to reduce the low-frequency radiation noise within a specific center frequency range.

[0037] In one embodiment, the second pipe portion 320 intersects with the first pipe portion 310 and is connected to an end of the first pipe portion 310 away from the first air inlet 210 . The second pipe portion 320 and the second air inlet pipe 200 are arranged side by side on the same side of the first pipe portion 310 .

[0038] Please refer to Figure 1 and Figure 2 The second pipe part 320 is arranged at one side of the first pipe part 310, and the extension direction of the second pipe part 320 intersects with the extension direction of the first pipe part 310, and further, can be orthogonal. By intersecting the second pipe part 320 with the first pipe part 310 and connecting the end of the first pipe part 310 away from the first air inlet 210, and arranging the second pipe part 320 and the second air intake pipe 200 side by side on the same side of the first pipe part 310, the first muffler 300 can more effectively guide the intake airflow into the engine, and at the same time, the structure of the intake system 10 can be made more compact and the occupied space can be reduced.

[0039] In one embodiment, the first air inlet 210 is an oblique opening, and the opening direction of the oblique opening faces the first resonant cavity 321 .

[0040] Please refer to Figure 2 The first air inlet 210 is an oblique opening, which can make the airflow of the first muffler 300 enter the second air inlet 200 more smoothly, and can reduce the resistance and noise of the airflow. In addition, the opening direction of the oblique opening can also make the noise sound waves of the second air inlet 200 better enter the first resonance cavity 321 and form resonance therein, thereby improving the muffler effect. The noise sound waves first enter the expansion cavity 311, and are transmitted to the first resonance cavity 321 along the opening direction of the oblique opening during the oscillation muffler process. The sound wave energy is consumed, and the muffler effect is achieved again, thereby greatly reducing the noise of the engine.

[0041] In one embodiment, the first tube portion 310 has a mounting end surface 314 away from the second tube portion 320 and a mounting side surface 315 connected to the mounting end surface 314 . The second air inlet 312 is disposed on the mounting end surface 314 . The second air outlet 313 is disposed on the mounting side surface 315 and adjacent to the second air inlet 312 .

[0042] Please refer to Figure 1 and Figure 2 By arranging the second air inlet 312 on the mounting end surface 314 and the second air outlet 313 on the mounting side surface 315 and adjacent to the second air inlet 312, the intake air flow can directly flow from the first pipe portion 310 into the second intake pipe 200, thereby ensuring the intake efficiency of the intake system 10. At the same time, the intake system 10 can be made more compact and occupy less space.

[0043] In one embodiment, a plurality of reinforcement structures 900 are disposed at intervals on the outer surface of the first muffler 300 and / or the first air intake pipe 100 .

[0044] Please refer to Figure 1, a plurality of reinforcing structures 900 are arranged at intervals on the outer surface of the first muffler 300. Further, a plurality of reinforcing structures 900 are arranged at intervals along the edge of the first muffler 300, and connect the two adjacent side walls of the edge. The reinforcing structure 900 plays a role of local reinforcement, avoiding the coupling resonance of the wall mode of the first muffler 300 and the excitation frequency of the power system, and solving the noise generated by the wall vibration of the first muffler 300. A plurality of reinforcing structures 900 are arranged at intervals on the outer surface of the first intake pipe 100. Further, a plurality of reinforcing structures 900 are arranged at intervals along the edge of the first intake pipe 100, and connect the two adjacent side walls of the edge. The reinforcing structure 900 plays a role of local reinforcement, avoiding the coupling resonance of the wall mode of the first intake pipe 100 and the excitation frequency of the power system, and solving the noise generated by the wall vibration of the first intake pipe 100.

[0045] In one embodiment, the reinforcement structure 900 is configured as a groove.

[0046] Please refer to Figure 1 The reinforcing structure 900 is configured as a groove, which can save the space occupied by the reinforcing structure 900, thereby reducing the volume of the first muffler 300; it can reduce the material used in the first muffler 300, thereby reducing the production cost and reducing the weight of the first muffler 300. In other embodiments, the reinforcing structure 900 can also be configured as reinforcing ribs, mutually connected reinforcing plates, etc.

[0047] In one embodiment, the air intake system 10 further includes an air filter 400 , a first connecting pipe 500 and a second connecting pipe 600 . The air filter 400 is connected to the second air inlet 312 through the first connecting pipe 500 , and is connected to the first air intake pipe 100 through the second connecting pipe 600 .

[0048] Please refer to Figure 1 The air inlet of the air filter 400 is connected to the second connecting pipe 600 (dirty air filter pipe), and the air outlet of the air filter 400 is connected to the first connecting pipe 500 (clean air filter pipe). The air filter 400 mainly plays a filtering role. The air filter 400 not only filters dust and various impurities in the air, but also controls the intake noise. The air filter 400 of different volumes is reasonably designed and selected. Its cavity is equivalent to a muffler with an expansion cavity 311, which attenuates the sound wave to transfer energy in the air filter 400, thereby eliminating noise.

[0049] In one embodiment, a sound absorbing material is disposed inside the air filter 400 .

[0050] In order to further improve the sound absorption effect inside the air filter 400, porous sound absorbing materials such as polyester fiber sound absorbing cotton, polyurethane foam, polystyrene foam and fiber, etc. can be added inside the air filter 400, which can also reduce the noise of the intake system 10.

[0051] In one embodiment, the air intake system 10 further includes a bellows 700 disposed between the second connecting pipe 600 and the first air intake pipe 100 , and the second connecting pipe 600 is connected to the first air intake pipe 100 through the bellows 700 .

[0052] Please refer to Figure 1 The bellows 700 can be configured as a corrugated rubber tube, which mainly plays a shock-absorbing role. The presence of the bellows 700 can provide a certain degree of flexible connection, making the connection between the second connecting pipe 600 and the first intake pipe 100 more flexible, and can reduce the stress and deformation caused by vibration and thermal expansion, thereby improving the reliability and durability of the intake system 10. The elastic characteristics of the bellows 700 can absorb the vibration and pulsation in the intake air flow, reduce the resistance and noise of the intake air flow, so that the intake air flow between the second connecting pipe 600 and the first intake pipe 100 can be transmitted more smoothly, and help reduce the noise generated in the intake system 10.

[0053] In one embodiment, the intake system 10 also includes a second silencer 800 disposed on the outside of the first intake pipe 100, and the second silencer 800 has a second resonance cavity, which is connected to one end of the first intake pipe 100 close to the second connecting pipe 600 and extends along the length direction of the first intake pipe 100.

[0054] Please refer to Figure 1 The second resonant cavity can eliminate the problem of low-frequency radiation noise within a specific central frequency range. The noise sound waves resonate with the air inside the second resonant cavity to achieve sound elimination and noise reduction. The shape and size of the second resonant cavity can be the same as those of the first resonant cavity 321 to further eliminate noise with the same frequency as the first resonant cavity 321; the shape and size of the second resonant cavity can also be different from those of the first resonant cavity 321, so as to eliminate noise with a wider range of frequencies. If space permits, multiple second silencer tubes 800 can be provided to enhance the sound elimination effect. Similarly, the shapes and sizes of the multiple second silencer tubes 800 can be the same or different.

[0055] The utility model also proposes a vehicle, which includes an intake system 10. The specific structure of the intake system 10 refers to the above-mentioned embodiment. Since the vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0056] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An air intake system for connecting to an engine, characterized in that: The air intake system comprises: A first air inlet pipe, used for communicating with the outside atmosphere; A second air intake pipe having a first air intake port and a first air outlet, wherein the first air outlet is used for connecting to the engine; The first silencer has an expansion cavity and a second air inlet and a second air outlet connected to the expansion cavity, the second air inlet is connected to the first air inlet pipe, the second air outlet is connected to the first air inlet, and a reference plane is defined perpendicular to the axial direction of the first air inlet, and the cross-sectional area of ​​the expansion cavity cut by the reference plane is larger than the cross-sectional area of ​​the first air inlet.

2. The air intake system according to claim 1, characterized in that The first muffler pipe includes a first pipe portion and a second pipe portion connected to each other. The first pipe portion forms the expansion cavity, and the second pipe portion forms a first resonance cavity communicating with the expansion cavity.

3. The air intake system according to claim 2, characterized in that: The second pipe portion intersects with the first pipe portion and is connected to an end of the first pipe portion away from the first air inlet. The second pipe portion and the second air inlet pipe are arranged side by side on the same side of the first pipe portion.

4. The air intake system according to claim 3, characterized in that: The first air inlet is an oblique opening, and the opening direction of the oblique opening is toward the first resonant cavity; And / or, the first pipe part has a mounting end face away from the second pipe part and a mounting side face connected to the mounting end face, the second air inlet is arranged on the mounting end face, and the second air outlet is arranged on the mounting side face and adjacent to the second air inlet.

5. The air intake system according to claim 1, characterized in that: A plurality of reinforcement structures are arranged at intervals on the outer surface of the first muffler pipe and / or the first air intake pipe.

6. The air intake system according to claim 5, characterized in that The reinforcement structure is configured as a groove.

7. The air intake system according to claim 1, characterized in that: The air intake system further includes an air filter, a first connecting pipe and a second connecting pipe. The air filter is connected to the second air intake port through the first connecting pipe, and is connected to the first air intake pipe through the second connecting pipe.

8. The air intake system according to claim 7, characterized in that The air filter is provided with sound absorbing material inside.

9. The air intake system according to claim 7, characterized in that: The air intake system further includes a bellows disposed between the second connecting pipe and the first air intake pipe, and the second connecting pipe is connected to the first air intake pipe through the bellows.

10. The air intake system according to claim 7, characterized in that The air intake system further includes a second muffler disposed outside the first air intake pipe, the second muffler having a second resonance cavity, the second resonance cavity being connected to an end of the first air intake pipe close to the second connecting pipe and extending along the length direction of the first air intake pipe.

11. A vehicle, characterized in that: Comprising an air intake system as described in any one of claims 1-10.

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