Impedance composite exhaust silencer

Abstract

The utility model relates to an impedance composite exhaust silencer which comprises a shell and a partition plate assembly installed in the shell, an air inlet pipe is arranged at one end of the shell, an exhaust pipe is arranged at the other end of the shell, a sound absorption plate is laid on the inner wall of the shell, a silencing pipe is installed on the partition plate assembly, and the sound absorption plate is arranged in the shell. A sound absorption assembly used for absorbing sound and preventing dust is arranged between the air inlet pipe and the partition plate assembly, the sound absorption assembly is detachably installed in the shell, and an end cover, close to one end of the sound absorption assembly, of the shell is of an openable and closable structure. The impedance composite exhaust silencer is high in noise reduction efficiency, remarkable in silencing effect, high in stability and long in service life.

Description

Technical Field

[0001] The utility model relates to a muffler, in particular to an impedance composite exhaust muffler. Background Art

[0002] A muffler is a device that blocks the propagation of sound but allows airflow to pass through. It is mainly used to eliminate aerodynamic noise. Existing exhaust mufflers are mainly divided into reactive mufflers and resistive mufflers. Resistive mufflers use resistive sound-absorbing materials attached to the rigid pipe wall to weaken the sound energy of the sound waves entering it. Resistive mufflers bypass the resonance cavity on the pipe or cause a sudden change in the area of ​​the pipe, causing the sound waves to reflect and interfere in the pipe to reduce noise. When resistive and reactive mufflers are used alone, the noise reduction effect cannot achieve the expected effect. Therefore, the combined use of resistive and reactive mufflers has gradually become a new trend, which can cope with noise of various frequencies.

[0003] In the prior art, a Chinese patent with publication number CN 212643888 U discloses an impedance composite muffler, including a shell, a cavity is provided inside the shell, a sound-absorbing layer is fixedly connected to the inner wall of the shell, an inorganic foam layer is bonded to one side of the sound-absorbing layer by an adhesive, and an inorganic fiber layer is bonded to one side of the inorganic foam layer by an adhesive. The muffler protected by this technical solution can offset and reduce noise at multiple levels and angles through the design of a sound-absorbing layer, a first muffler sheet, a second muffler sheet, a third muffler sheet, a first damping muffler plate, a second damping muffler plate, a first muffler net, a second muffler net, a first perforation, a second perforation, a third perforation and a sponge pad. However, the structure of this technical solution is relatively complex, which not only increases the difficulty of manufacturing and processing, but also is not easy to assemble and maintain. Moreover, after long-term use, dust is easily accumulated inside the muffler, which is difficult to clean and has a short service life. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide an impedance composite exhaust muffler with high noise reduction efficiency, significant silencing effect, high stability and long service life.

[0005] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:

[0006] An impedance composite exhaust silencer comprises a shell and a baffle assembly installed inside the shell, wherein an air intake pipe is provided at one end of the shell and an exhaust pipe is provided at the other end, a sound absorbing plate is laid on the inner wall of the shell, a silencer pipe is installed on the baffle assembly, a sound absorbing assembly for sound absorption and dust prevention is provided between the air intake pipe and the baffle assembly, the sound absorbing assembly is detachably installed inside the shell, and an end cover on the shell close to one end of the sound absorbing assembly is an openable and closable structure.

[0007] Furthermore, the sound absorbing assembly includes a support frame and sound absorbing cotton detachably mounted on the support frame. A mounting seat is fixedly arranged in the shell, and the support frame is detachably mounted on the mounting seat.

[0008] Furthermore, the support frame is an annular structure, and an annular embedding groove is formed on the inner wall of the annular structure, and the outer edge of the sound-absorbing cotton is detachably embedded in the above-mentioned embedding groove.

[0009] Furthermore, the sound absorbing plate is a trapezoidal corrugated structure.

[0010] Furthermore, the trough of the sound absorbing plate is in contact with the inner wall of the shell, and there is a gap between the peak of the sound absorbing plate and the inner wall of the shell, and the gap is a noise reduction cavity.

[0011] Furthermore, the partition assembly includes partition one, partition two and partition three that are spaced apart from each other, and the partition one, partition two and partition three divide the interior of the shell into four chambers, namely, silencer chamber one, silencer chamber two, silencer chamber three and silencer chamber four, and the silencer chamber one, silencer chamber two, silencer chamber three and silencer chamber four are interconnected through silencer pipes.

[0012] Furthermore, the muffler comprises an outlet section, a diffusion section and an inlet section which are connected in sequence, the cross-sectional area of ​​the diffusion section is larger than the cross-sectional areas of the outlet section and the inlet section, and a plurality of diffusion holes distributed at intervals are penetrated through the side wall of the diffusion section.

[0013] Furthermore, there are two silencer pipes, which are staggered up and down. One of the silencer pipes is connected between partition one and partition two, and the inlet section of the silencer pipe is connected to silencer chamber one, the outlet section is connected to silencer chamber three, and the diffusion section is connected to silencer chamber two. The other silencer pipe is connected between partition two and partition three, and the inlet section of the silencer pipe is connected to silencer chamber two, the outlet section is connected to silencer chamber four, and the diffusion section is connected to silencer chamber three.

[0014] Furthermore, a flange is provided on an end surface of one end of the support frame, and an outer diameter of the flange is smaller than an outer diameter of the support frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention improves the efficiency of attenuating sound waves and greatly improves the effect of reducing noise by making structural improvements to the interior of the shell; and further improves the noise reduction effect by arranging a detachable sound-absorbing component near the air intake pipe in the shell, while preventing dust from entering the shell, thereby effectively ensuring the stability of silencing, extending the service life of the entire device, making disassembly and assembly convenient, and reducing the cost of use and cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a schematic diagram of the structure of an impedance composite exhaust muffler of the utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0018] Figure 3 It is a three-dimensional structural diagram of a sound-absorbing component in an impedance composite exhaust muffler of the utility model;

[0019] Among them, 1. Shell; 11. End cover; 12. Silence chamber one; 13. Silence chamber two; 14. Silence chamber three; 15. Silence chamber four; 2. Sound absorbing plate; 21. Mounting seat; 221. Stopper; 3. Partition assembly; 31. Partition one; 32. Partition two; 33. Partition three; 4. Silence pipe; 41. Exit section; 42. Diffusion section; 421. Diffusion hole; 43. Inlet section; 5. Sound absorbing assembly; 51. Support frame; 511. Embossed groove; 512. Flanged edge; 52. Sound absorbing cotton; 6. Inlet pipe; 7. Exhaust pipe; 8. Noise reduction chamber. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0021] It should be noted that, in the description of the technical solution of the present invention, some directional words used to clearly describe the technical features of the present invention, such as "front", "back", "up", "down", "top", "bottom", "inside", "outside", etc., are all in accordance with the orientation of the drawings of the present invention.

[0022] Example

[0023] like Figure 1As shown, an impedance composite exhaust silencer of the present embodiment includes a shell 1 and a partition assembly 3 installed inside the shell 1. An air inlet pipe 6 is provided at one end of the shell 1, and an exhaust pipe 7 is provided at the other end. A sound absorbing plate 2 is laid on the inner wall of the shell 1, that is, the inner side surface and the inner side of the end surfaces of the shell 1 are laid with sound absorbing plates 2. The laying method adopts the structure in the prior art, which will not be repeated here. The sound absorbing plate 2 adopts the sound absorbing material in the prior art for sound absorption and noise reduction. The cross-sectional shape of the sound absorbing plate 2 is an uneven wave shape. With this structure, the reflection frequency of sound waves inside the shell 1 can be further increased, and the intensity of sound waves can be reduced more quickly. Specifically in the present embodiment, the sound absorbing plate 2 is a trapezoidal corrugated structure. The trough of the sound absorbing plate 2 fits the inner wall of the shell 1, and there is a gap between the wave peak of the sound absorbing plate 2 and the inner wall of the shell 1, and the gap is a noise reduction cavity 8. Since the sound absorbing plate 2 is a trapezoidal wave structure, the gap formed by the wave crest of the sound absorbing plate 2 and the inner wall of the shell 1 is also a trapezoidal space, that is, the noise reduction cavity 8 is a trapezoidal cavity. After the residual wave of the sound wave enters the noise reduction cavity 8, it is reflected multiple times in the trapezoidal cavity and interferes with each other, converting the sound energy into heat energy.

[0024] A silencer pipe 4 is installed on the partition assembly 3, and the partition assembly 3 includes partition 1 31, partition 2 32 and partition 3 33 that are spaced apart. In this embodiment, partition 1 31, partition 2 32 and partition 3 33 are fixedly connected to the inner wall of the sound absorbing plate 2.

[0025] The partition 1 31, the partition 2 32 and the partition 3 33 divide the interior of the shell 1 into four chambers, namely, the muffler chamber 1 12, the muffler chamber 2 13, the muffler chamber 3 14 and the muffler chamber 4 15. The muffler chamber 1 12, the muffler chamber 2 13, the muffler chamber 3 14 and the muffler chamber 4 15 are interconnected through the muffler pipe 4. The muffler pipe 4 includes an outlet section 41, a diffusion section 42 and an inlet section 43 connected in sequence. The cross-sectional areas of the outlet section 41 and the inlet section 43 are the same, the cross-sectional area of ​​the diffusion section 42 is larger than the cross-sectional areas of the outlet section 41 and the inlet section 43, and the diffusion section 42 is connected to the outlet section 41 and the inlet section 43 by an inclined surface transition, and the side wall of the diffusion section 42 is penetrated by a plurality of diffusion holes 421 distributed at intervals. The sound waves enter the muffler 4 through the inlet section 43, are reflected on the side wall of the muffler 4, and interfere with each other, thereby reducing the sound energy; and the reflection and interference of the sound waves are further strengthened by setting a diffusion section 42 with a suddenly increased cross-sectional area, thereby improving the muffler effect. In this embodiment, there are two muffler pipes 4, and the two muffler pipes 4 are staggered up and down. One of the muffler pipes 4 is connected between the partition 1 31 and the partition 2 32, and the inlet section 43 of the muffler 4 is connected to the muffler chamber 1 12, the outlet section 41 is connected to the muffler chamber 3 14, and the diffusion section 42 is connected to the muffler chamber 2 13. The other muffler pipe 4 is connected between the partition 2 32 and the partition 3 33, and the inlet section 43 of the muffler 4 is connected to the muffler chamber 2 13, the outlet section 41 is connected to the muffler chamber 4 15, and the diffusion section 42 is connected to the muffler chamber 3 14.

[0026] After the sound waves enter the shell 1 from the air inlet pipe 6, they first enter the muffler chamber 12, then enter the muffler 4 through the inlet section 43 of the muffler 4 installed on the partition 1 31, and part of the sound waves enter the muffler chamber 3 14 through the outlet section 41 of the muffler 4, and part of the sound waves enter the muffler chamber 2 13 through the diffusion hole 421 on the diffusion section 42 of the muffler 4; then the sound waves in the muffler chamber 2 13 enter the muffler 4 through the inlet section 43 of another muffler 4, and the sound waves in the muffler chamber 3 14 enter the inside of the muffler 4 through the diffusion hole 421 on the diffusion section 42 of the muffler 4, and then enter the muffler chamber 4 15 through the outlet section 41 of the muffler 4, and finally exit the shell 1 from the exhaust pipe 7. In the above process, the sound energy of the sound waves is greatly weakened after multiple reflections and mutual interference, thereby achieving a silencing effect.

[0027] In order to further improve the sound absorption and noise reduction effect, it also plays a role in preventing dust and dirt. Figure 2 and Figure 3As shown, in this embodiment, a sound-absorbing component 5 for sound absorption and dust prevention is arranged between the air intake pipe 6 and the partition assembly 3. The sound-absorbing component 5 is detachably mounted inside the housing 1, and the end cover 11 on the housing 1 near one end of the sound-absorbing component 5 is an openable structure. The openable structure between the end cover 11 and the housing 1 adopts the structure in the prior art, and will not be described in detail. Specifically, the sound-absorbing component 5 includes a support frame 51 and a sound-absorbing cotton 52 detachably mounted on the support frame 51. A mounting seat 21 is fixedly arranged in the housing 1, and the support frame 51 is detachably mounted on the mounting seat 21. More specifically, in this embodiment, the mounting seat 21 and the support frame 51 are both annular structures, and the inner ring of the mounting seat 21 and the outer ring of the support frame 51 are respectively provided with matching threads. When installing, the support frame 51 and the mounting seat 21 are screwed together, and the end of the mounting seat 21 away from the air intake pipe 6 extends radially inward to form a stopper 221, which is used to stop the support frame 51 to prevent it from being installed too far. The inner wall of the support frame 51 is concavely formed with an annular embedding groove 511, and the sound-absorbing cotton 52 is made of a sound-absorbing material with certain flexibility and air permeability, which is used to consume the vibration energy of the sound wave. During installation, the outer edge of the sound-absorbing cotton 52 is directly and detachably embedded in the above-mentioned embedding groove 511. In addition, a flange 512 is provided on the end surface of one end of the support frame 51, and the outer diameter of the flange 512 is smaller than the outer diameter of the support frame 51, so that the support frame 51 can be held by hand. With this structure, after the sound wave enters the muffler cavity 12, it needs to pass through the sound-absorbing cotton 52 before entering the muffler 4. In the process of passing through the sound-absorbing cotton 52, the sound wave can not only weaken part of the sound intensity, but also intercept dust and impurities, so as to prevent dust from entering the muffler 4 and accumulating, making it difficult to clean, affecting the muffler effect and service life. When the sound-absorbing cotton 52 is used for a long time and accumulates a lot of dust and needs to be replaced, first open the end cover 11 of the shell 1, then rotate the support frame 51 to disengage it from the mounting seat 21, then take out the support frame 51, and directly remove the sound-absorbing cotton 52, and insert the new sound-absorbing cotton 52 into the embedding groove 511 of the support frame 51; then install the support frame 51 on the mounting seat 21, and close the end cover 11, and the replacement operation of the sound-absorbing cotton 52 is completed.

[0028] The utility model discloses an impedance composite exhaust muffler, which improves the efficiency of attenuating sound waves and greatly improves the effect of reducing noise by making structural improvements to the interior of the shell 1. It also further improves the noise reduction effect by arranging a detachable sound-absorbing component 5 near the air intake pipe 6 in the shell 1, while preventing dust from entering the interior of the shell 1, which can effectively ensure the stability of silencing, extend the service life of the entire device, facilitate disassembly and assembly, and reduce the cost of use and cleaning.

[0029] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. An impedance composite exhaust muffler, characterized in that: The invention comprises a shell (1) and a partition assembly (3) installed inside the shell (1); an air intake pipe (6) is provided at one end of the shell (1) and an exhaust pipe (7) is provided at the other end; a sound absorbing plate (2) is laid on the inner wall of the shell (1); a muffler pipe (4) is installed on the partition assembly (3); a sound absorbing assembly (5) for sound absorption and dust prevention is provided between the air intake pipe (6) and the partition assembly (3); the sound absorbing assembly (5) is detachably installed inside the shell (1); and an end cover (11) on the shell (1) close to one end of the sound absorbing assembly (5) is an openable and closable structure.

2. The impedance composite exhaust muffler according to claim 1, characterized in that: The sound absorbing component (5) comprises a support frame (51) and a sound absorbing cotton (52) detachably mounted on the support frame (51); a mounting seat (21) is fixedly provided in the housing (1); and the support frame (51) is detachably mounted on the mounting seat (21).

3. The impedance composite exhaust muffler according to claim 2, characterized in that: The support frame (51) is an annular structure, and an annular embedding groove (511) is formed inwardly on the inner wall of the annular structure, and the outer edge of the sound-absorbing cotton (52) is detachably embedded in the embedding groove (511).

4. An impedance composite exhaust muffler according to claim 1 or 3, characterized in that: The sound absorbing plate (2) is a trapezoidal corrugated structure.

5. The impedance composite exhaust muffler according to claim 4, characterized in that: The trough of the sound absorbing plate (2) fits with the inner wall of the shell (1), and there is a gap between the peak of the sound absorbing plate (2) and the inner wall of the shell (1), and the gap is the noise reduction cavity (8).

6. The impedance composite exhaust muffler according to claim 5, characterized in that: The partition assembly (3) comprises partition one (31), partition two (32) and partition three (33) which are spaced apart from each other. The partition one (31), partition two (32) and partition three (33) divide the interior of the shell (1) into four chambers, namely, silencer chamber one (12), silencer chamber two (13), silencer chamber three (14) and silencer chamber four (15). The silencer chamber one (12), silencer chamber two (13), silencer chamber three (14) and silencer chamber four (15) are interconnected via a silencer pipe (4).

7. The impedance composite exhaust muffler according to claim 6, characterized in that: The muffler pipe (4) comprises an outlet section (41), a diffuser section (42) and an inlet section (43) which are connected in sequence, the cross-sectional area of ​​the diffuser section (42) being larger than the cross-sectional areas of the outlet section (41) and the inlet section (43), and a plurality of diffuser holes (421) distributed at intervals are provided through the side wall of the diffuser section (42).

8. The impedance composite exhaust muffler according to claim 7, characterized in that: The silencer pipes (4) are provided with two silencer pipes (4), which are staggered in an upper and lower direction. One silencer pipe (4) is connected between partition plate 1 (31) and partition plate 2 (32), and the inlet section (43) of the silencer pipe (4) is connected to silencer chamber 1 (12), the outlet section (41) is connected to silencer chamber 3 (14), and the diffusion section (42) is connected to silencer chamber 2 (13). The other silencer pipe (4) is connected between partition plate 2 (32) and partition plate 3 (33), and the inlet section (43) of the silencer pipe (4) is connected to silencer chamber 2 (13), the outlet section (41) is connected to silencer chamber 4 (15), and the diffusion section (42) is connected to silencer chamber 3 (14).

9. The impedance composite exhaust muffler according to claim 3, characterized in that: A flange (512) is provided on an end surface of one end of the support frame (51), and the outer diameter of the flange (512) is smaller than the outer diameter of the support frame (51).

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