Broadband silencer and engine air inlet system

Abstract

The utility model provides a broadband silencer and an engine air inlet system. The broadband silencer comprises an air inlet pipe, an air outlet pipe, a silencer shell connected between the air inlet pipe and the air outlet pipe, and a resonance sound absorption structure arranged in the silencer shell. The resonance sound absorption structure is made of an elastic vibration material and is configured to be tubular; the resonance sound absorption structure is connected between the air inlet pipe and the air outlet pipe and forms an air inlet channel together with the air inlet pipe and the air outlet pipe. The inner diameter of the silencer shell is larger than the outer diameter of the resonance sound absorption structure, and a silencing cavity is formed between the silencer shell and the resonance sound absorption structure. According to the broadband silencer, elastic vibration of the resonance sound absorption structure enables the silencing cavity to form a resonance cavity, energy of noise is converted into vibration kinetic energy, and therefore the silencing performance of the broadband silencer can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile engines, and in particular to a broadband muffler. In addition, the utility model also relates to an engine air intake system. Background Art

[0002] With the widespread use of supercharged engines, wide-band mufflers have become standard for intake systems. Currently, the internal structure of the muffler is a composite structure of openings, slots, or openings and slots. At the same time, in order to increase the frequency range of silencer, a layer of sound-absorbing material is also covered on the openings or slots.

[0003] However, the existing structure of this type is greatly affected by the overall spatial layout, which may result in the muffler having no muffler effect or poor muffler effect at certain key frequencies, which is not conducive to the good operation of the engine system and has an adverse effect on the vehicle's NVH (Noise, Vibration, Harshness) performance. Utility Model Content

[0004] In view of this, the utility model aims to provide a broadband muffler to improve the muffler performance of the broadband muffler.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A broadband muffler comprises an air inlet pipe, an air outlet pipe, a muffler shell connected between the air inlet pipe and the air outlet pipe, and a resonance sound absorbing structure arranged in the muffler shell;

[0007] The resonant sound absorbing structure is made of a material that can vibrate elastically and is constructed in a tubular shape; the resonant sound absorbing structure is connected between the air inlet pipe and the air outlet pipe, and together with the air inlet pipe and the air outlet pipe, forms an air inlet channel; the inner diameter of the muffler shell is larger than the outer diameter of the resonant sound absorbing structure, and a muffler cavity is formed between the muffler shell and the resonant sound absorbing structure.

[0008] Furthermore, the resonant sound absorbing structure comprises a metal thin-walled tube made of metal sheets, and two ends of the metal thin-walled tube are respectively overlapped on the outer walls of the air inlet pipe and the air outlet pipe.

[0009] Furthermore, the muffler shell includes a main pipe section, and a front end closing and a rear end closing respectively arranged at the front and rear ends of the main pipe section; the front end closing is connected to the air inlet pipe, and the end of the metal thin-walled tube overlapped on the air inlet pipe is pressed against the air inlet pipe by the front end closing; the rear end closing is connected to the air outlet pipe, and the end of the metal thin-walled tube overlapped on the air outlet pipe is pressed against the air outlet pipe by the rear end closing.

[0010] Furthermore, the metal thin-walled tube is fixedly connected to the air inlet pipe and the air outlet pipe by bonding.

[0011] Furthermore, the thickness of the metal thin-walled tube is 0.6 mm to 1.0 mm.

[0012] Furthermore, the resonant sound absorbing structure also includes a sound absorbing material coated on the outer wall of the metal thin-walled tube, and the metal thin-walled tube and the sound absorbing material together constitute the isolation between the air intake channel and the muffler cavity.

[0013] Furthermore, a partition is provided inside the silencing chamber, and the silencing chamber is divided into a plurality of sub-chambers by the partition.

[0014] Furthermore, the partition includes a first partition and a second partition, the first partition and the second partition are both located on the axial section of the intake channel, and the first partition and the second partition are arranged at intervals around the intake channel.

[0015] Furthermore, the first baffle is fixed on the muffler shell, the second baffle is fixed on the resonant sound absorbing structure, and the muffler shell can rotate relative to the resonant sound absorbing structure.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The broadband muffler of the utility model connects a tubular resonant sound-absorbing structure between an air inlet pipe and an air outlet pipe, and a muffler cavity is arranged between a muffler shell and the resonant sound-absorbing structure. The noise generated by the airflow passing through the air inlet passage will excite the resonance of the resonant sound-absorbing structure when reaching the resonant sound-absorbing structure, and the elastic vibration of the resonant sound-absorbing structure will also cause the muffler cavity to form a resonant cavity, similar to a spring system, and the resonant sound-absorbing structure is similar to a mass system, thus forming a muffler structure of mass-spring resonance, so that the energy of the noise is converted into vibration kinetic energy, thereby improving the muffler performance of the broadband muffler.

[0018] In addition, the use of a metal thin-walled tube made of metal sheets as a resonant sound-absorbing structure is not only convenient for material selection, but also for processing and construction. The air inlet pipe, the metal thin-walled tube and the air outlet pipe are all tubular structures and can be connected in sequence to form a standardized air inlet passage. The front and rear ends of the muffler shell are provided with a closing structure, which is not only convenient for the connection and assembly of the muffler shell and the air inlet pipe and the air outlet pipe, but also convenient for forming a muffler cavity between the main pipe section and the metal thin-walled tube. By using the closing to press the ends of the metal thin-walled tube onto the air inlet pipe and the air outlet pipe, the connection firmness of the ends of the metal thin-walled tube can be ensured, and the loosening and displacement of the metal thin-walled tube can be prevented.

[0019] Another object of the utility model is to provide an engine air intake system, wherein the engine air intake system is provided with the broadband muffler of the utility model. The engine air intake system of the utility model has the technical advantages possessed by the above-mentioned broadband muffler. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention. The directional terms such as front and back, top and bottom involved therein are only used to indicate relative positional relationships and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the overall external structure of the broadband muffler according to an embodiment of the utility model;

[0022] Figure 2 It is a front view of the broadband muffler according to an embodiment of the utility model;

[0023] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the part indicated by AA;

[0024] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure of the part indicated by section BB;

[0025] Figure 5 This is a noise frequency distribution curve diagram of the engine intake system described in an embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 1. Intake pipe;

[0028] 2. Muffler housing; 20. Main pipe section; 21. Front end closing; 22. Rear end closing;

[0029] 3. Sound absorbing material; 4. Metal thin-walled tube; 5. Exhaust pipe;

[0030] 61. first partition; 62. second partition;

[0031] 7. Air intake passage; 8. Silence chamber; 81. First silence chamber; 82. Second silence chamber. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0033] In the description of the present invention, it should be stated that if there are terms indicating directions or positional relationships such as "up, down, left, right, front, back, inside, outside", etc., they are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installed", "connected", "connection", and "connector" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific circumstances. The limiting terms such as "first, second, A, B, C, D" that appear in the description of the present utility model are only used to distinguish similar features of different positions, attributes or uses, so as to achieve the purpose of avoiding ambiguity and confusion in the description, and cannot be understood as indicating or implying relative importance.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] Embodiment 1

[0037] This embodiment relates to a broadband muffler, which can improve the muffler performance of the broadband muffler; an exemplary structure thereof is as follows Figure 1 , Figure 2 , Figure 3 and Figure 4 shown.

[0038] In general, the broadband muffler comprises an air inlet pipe 1, an air outlet pipe 5, a muffler housing 2 connected between the air inlet pipe 1 and the air outlet pipe 5, and a resonant sound absorbing structure arranged in the muffler housing 2. The resonant sound absorbing structure is made of a material that can vibrate elastically and is constructed in a tubular shape; the resonant sound absorbing structure is connected between the air inlet pipe 1 and the air outlet pipe 5, and together with the air inlet pipe 1 and the air outlet pipe 5, forms an air inlet passage 7. The inner diameter of the muffler housing 2 is larger than the outer diameter of the resonant sound absorbing structure, and a muffler cavity 8 is formed between the muffler housing 2 and the resonant sound absorbing structure.

[0039] It should be noted that the above-mentioned resonant sound absorbing structure has a variety of construction forms. For example, a round tube made of a rubber sheet can be used to connect between the air inlet pipe 1 and the air outlet pipe 5. However, preferably, the resonant sound absorbing structure of this embodiment includes a metal thin-walled tube 4 made of a metal sheet, and the two ends of the metal thin-walled tube 4 are respectively overlapped on the outer walls of the air inlet pipe 1 and the air outlet pipe 5. The use of the metal thin-walled tube 4 made of a metal sheet as a resonant sound absorbing structure is not only convenient for material selection, but also convenient for processing and construction. The air inlet pipe 1, the metal thin-walled tube 4 and the air outlet pipe 5 are all tubular structures and can be connected in sequence to form a standardized air inlet channel 7.

[0040] Based on the resonance sound absorption structure adopting the form of metal thin-walled tube 4, the muffler shell 2 of this embodiment includes a main tube section 20, and a front end closing 21 and a rear end closing 22 respectively arranged at the front and rear ends of the main tube section 20. Among them, the front end closing 21 is connected to the air inlet pipe 1, and the end of the metal thin-walled tube 4 overlapped on the air inlet pipe 1 is pressed on the air inlet pipe 1 by the front end closing 21; the rear end closing 22 is connected to the air outlet pipe 5, and the end of the metal thin-walled tube 4 overlapped on the air outlet pipe 5 is pressed on the air outlet pipe 5 by the rear end closing 22. The closing structure is arranged at the front and rear ends of the muffler shell 2, which is not only convenient for the connection and assembly of the muffler shell 2 and the air inlet pipe 1 and the air outlet pipe 5, but also convenient for forming a muffler cavity 8 between the main tube section 20 and the metal thin-walled tube 4. By using the closing to press the ends of the metal thin-walled tube 4 on the air inlet pipe 1 and the air outlet pipe 5, the connection firmness of the ends of the metal thin-walled tube 4 can be ensured, and the loosening and displacement of the metal thin-walled tube 4 can be prevented.

[0041] In addition, preferably, the metal thin-walled tube 4 is fixedly connected to the air inlet pipe 1 and the air outlet pipe 5 by bonding. By bonding the metal thin-walled tube 4 to the air inlet pipe 1 and the air outlet pipe 5, the connection reliability and sealing between the metal thin-walled tube 4 and the air inlet pipe 1 and the air outlet pipe 5 can be improved, thereby preventing noise leakage.

[0042] The thickness of the metal sheet used for the metal thin-walled tube 4 can be set between 0.6 mm and 1.0 mm, that is, the thickness of the metal thin-walled tube 4 is 0.6 mm to 1.0 mm. The metal thin sheet with a thickness of 0.6 mm to 1.0 mm is used to make the metal thin-walled tube 4, which can ensure that the metal thin-walled tube 4 has good elastic vibration performance; preferably, it is recommended to use a 0.8 mm metal sheet.

[0043] In addition, if Figure 3 and Figure 4As shown, the resonant sound absorbing structure of this embodiment also includes a sound absorbing material 3 coated on the outer wall of the metal thin-walled tube 4, and the metal thin-walled tube 4 and the sound absorbing material 3 together constitute the isolation between the air intake channel 7 and the muffler cavity 8. By coating a layer of sound absorbing material 3 on the outside of the metal thin-walled tube 4, the sound absorbing material 3 can be bonded to the metal thin-walled tube 4, and the sound absorbing ability of the resonant sound absorbing structure can be further enhanced. In actual operation, the sound absorbing material 3 can be made of porous attracting materials such as sound absorbing cotton. A large number of muffler holes can also be set on the metal thin-walled tube 4.

[0044] Based on the above-mentioned setting, a partition can also be set in the silencing chamber 8; by setting the partition inside the silencing chamber 8, the silencing chamber 8 can be divided into a plurality of sub-chambers. By using the partition to divide the silencing chamber 8 into a plurality of sub-chambers, the size of each sub-chamber can be set according to different noise frequencies, thereby achieving a targeted silencing effect. In specific implementation, the following scheme can be adopted.

[0045] like Figure 3 As shown, the above-mentioned partition includes a first partition 61 and a second partition 62, both of which are located on the axial section of the air intake passage 7, and the first partition 61 and the second partition 62 are arranged at intervals around the air intake passage 7. At the same time, the first partition 61 can be fixed on the muffler housing 2, and the second partition 62 can be fixed on the resonant sound absorbing structure, and the muffler housing 2 can rotate relative to the resonant sound absorbing structure.

[0046] The first partition plate 61 and the second partition plate 62 separate the silencer chamber 8 into two independent silencer chambers, namely the first silencer chamber 81 and the second silencer chamber 82. When the silencer housing 2 is rotated relative to the resonant sound absorption structure with the axis of the air intake channel 7 as the axis, the relative angular position of the first partition plate 61 and the second partition plate 62 will change, thereby changing the size of the first silencer chamber 81 and the second silencer chamber 82, thereby achieving the effect of adjusting the silencer frequency.

[0047] In summary, the broadband muffler of the present embodiment connects a tubular resonant sound-absorbing structure between the air inlet pipe 1 and the air outlet pipe 5, and sets a muffler cavity 8 between the muffler shell 2 and the resonant sound-absorbing structure; the noise generated by the airflow passing through the air inlet channel 7 will excite the resonance of the resonant sound-absorbing structure when it reaches the resonant sound-absorbing structure, and the elastic vibration of the resonant sound-absorbing structure also causes the muffler cavity 8 to form a resonant cavity, similar to a spring system, and the resonant sound-absorbing structure is similar to a mass system, thus forming a muffler structure of mass-spring resonance, so that the energy of the noise is converted into vibration kinetic energy, thereby improving the muffler performance of the broadband muffler.

[0048] Embodiment 2

[0049] This embodiment relates to an engine air intake system, in which the broadband muffler provided in the first embodiment is provided.

[0050] like Figure 5 As shown, under normal circumstances, the frequency bandwidth distribution of the noise generated by the airflow in the intake channel 7 of the engine intake system is relatively large; the main noise exists between 300Hz and 1000Hz. The existing conventional broadband muffler is difficult to effectively eliminate the noise in each frequency band.

[0051] The broadband muffler of the utility model utilizes a metal sheet and a sound absorbing material 3 to isolate a muffler cavity 8. The elastic vibration performance of the metal sheet can generate resonance for noises in multiple frequency bands. The resonant sound absorbing structure and the muffler cavity 8 together form a resonant cavity effect, which helps to dissipate the vibration kinetic energy, thereby ultimately achieving the effect of muffler noise reduction. Moreover, the broadband muffler of the utility model has a simple structure, is easy to process and construct, and has good practicality.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A broadband muffler, characterized in that: It comprises an air inlet pipe (1), an air outlet pipe (5), a muffler shell (2) connected between the air inlet pipe (1) and the air outlet pipe (5), and a resonance sound absorption structure arranged in the muffler shell (2); The resonant sound absorbing structure is made of a material capable of elastic vibration and is constructed in a tubular shape; the resonant sound absorbing structure is connected between the air inlet pipe (1) and the air outlet pipe (5), and together with the air inlet pipe (1) and the air outlet pipe (5) forms an air inlet passage (7); The inner diameter of the muffler shell (2) is greater than the outer diameter of the resonant sound absorbing structure, and a muffler cavity (8) is formed between the muffler shell (2) and the resonant sound absorbing structure.

2. The broadband muffler according to claim 1, characterized in that: The resonant sound absorption structure comprises a metal thin-walled tube (4) made of metal sheets, and the two ends of the metal thin-walled tube (4) are respectively overlapped on the outer walls of the air inlet pipe (1) and the air outlet pipe (5).

3. The broadband muffler according to claim 2, characterized in that: The muffler housing (2) comprises a main pipe section (20), and a front end closing opening (21) and a rear end closing opening (22) respectively arranged at the front and rear ends of the main pipe section (20); The front end closing opening (21) is connected to the air intake pipe (1), and one end of the metal thin-walled tube (4) overlapped on the air intake pipe (1) is pressed against the air intake pipe (1) by the front end closing opening (21); The rear end closing opening (22) is connected to the air outlet pipe (5), and one end of the metal thin-walled tube (4) overlapped on the air outlet pipe (5) is pressed against the air outlet pipe (5) by the rear end closing opening (22).

4. The broadband muffler according to claim 2, characterized in that: The metal thin-walled tube (4) is fixedly connected to the air inlet pipe (1) and the air outlet pipe (5) by bonding.

5. The broadband muffler according to claim 2, characterized in that: The thickness of the metal thin-walled tube (4) is 0.6 mm to 1.0 mm.

6. The broadband muffler according to claim 2, characterized in that: The resonant sound absorption structure also includes a sound absorption material (3) coated on the outer wall of the metal thin-walled tube (4), and the metal thin-walled tube (4) and the sound absorption material (3) together constitute the isolation between the air intake channel (7) and the muffler cavity (8).

7. The broadband muffler according to any one of claims 1 to 6, characterized in that: A partition is provided inside the muffler chamber (8), and the muffler chamber (8) is divided into a plurality of sub-chambers by the partition.

8. The broadband muffler according to claim 7, characterized in that: The partition plate comprises a first partition plate (61) and a second partition plate (62), wherein the first partition plate (61) and the second partition plate (62) are both located on an axial section of the air intake passage (7), and the first partition plate (61) and the second partition plate (62) are arranged at intervals around the air intake passage (7).

9. The broadband muffler according to claim 8, characterized in that: The first baffle (61) is fixedly mounted on the muffler housing (2), the second baffle (62) is fixedly mounted on the resonant sound absorbing structure, and the muffler housing (2) is rotatable relative to the resonant sound absorbing structure.

10. An engine air intake system, characterized in that: The engine intake system is provided with a broadband muffler as claimed in any one of claims 1 to 9.

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