Silencing structure and engine

Abstract

This application provides a muffler structure and an engine. The muffler cover includes an upper inner plate and an upper outer plate, with the upper inner plate forming an air intake channel. The muffler lower body includes a lower inner plate and a lower outer plate, with the lower inner plate forming an air outlet channel. The muffler components include a muffler pipe, a first baffle, and a second baffle. The muffler pipe has a muffler channel that communicates with the air intake and air outlet channels. The first baffle is disposed on the outer wall of the muffler pipe and, together with the upper inner plate and the upper outer plate, forms an upper chamber. The first baffle, the second baffle, and the lower outer plate form a middle chamber. The second baffle is disposed on the outer wall of the muffler pipe and, together with the lower inner plate and the lower outer plate, forms a lower chamber. The muffler channel communicates with the upper chamber, the middle chamber, and the lower chamber. This application adds interconnected upper, middle, and lower chambers to the muffler channel. Airflow noise enters the upper, middle, and lower chambers through the muffler channel and is transmitted and reflected between the chambers, weakening noise energy and achieving a noise reduction effect.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to a noise reduction structure and an engine. Background Technology

[0002] Turbocharging technology has been widely used in modern automobile engines due to its ability to significantly improve engine power density and fuel economy. However, when a turbocharger operates at high speed, its compressor impeller generates strong disturbances to the intake airflow, resulting in significant aerodynamic noise that is harsh and sharp, seriously affecting the ride comfort in the cabin and the overall vehicle quality.

[0003] Therefore, it is necessary to design a noise reduction structure and engine to solve the above-mentioned technical problems. Utility Model Content

[0004] This application provides a noise reduction structure and an engine that can reduce engine noise.

[0005] According to a first aspect of the embodiments of this specification, a noise reduction structure is provided, comprising:

[0006] The muffler cover includes an upper inner plate and an upper outer plate, wherein the upper inner plate forms an air intake channel;

[0007] The lower body of the muffler includes a lower inner plate and a lower outer plate; the lower inner plate forms an air outlet channel; and

[0008] A muffler element is disposed within the lower body of the muffler. The muffler element includes a muffler pipe, a first partition, and a second partition. The muffler pipe has a muffler channel that communicates with the air inlet channel and the air outlet channel. The first partition is disposed on the outer wall of the muffler pipe and, together with the upper inner plate and the upper outer plate, forms an upper chamber. The first partition, the second partition, and the lower outer plate form a middle chamber. The second partition is disposed on the outer wall of the muffler pipe and, together with the lower inner plate and the lower outer plate, forms a lower chamber.

[0009] The silencing channel is interconnected with the upper chamber, the middle chamber, and the lower chamber.

[0010] Furthermore, the silencer pipe is provided with a plurality of silencer holes, including at least two types of silencer holes.

[0011] Furthermore, the first partition plate has a plurality of first notches at its edge away from the silencer pipe, and the plurality of first notches are spaced apart and penetrate the first partition plate axially;

[0012] The second partition has a plurality of second notches at its edge away from the silencer pipe, and the plurality of second notches are spaced apart and penetrate the second partition axially.

[0013] Furthermore, the radial cross-section of the silencing channel is elliptical.

[0014] Furthermore, the center of the ellipse is offset from the center of the muffler element.

[0015] Furthermore, the lower surface of the first partition is provided with a plurality of spaced first reinforcing ribs, which extend from the silencing channel toward the middle cavity;

[0016] The upper surface of the second partition is provided with a plurality of spaced second reinforcing ribs, which extend from the silencing channel toward the middle chamber.

[0017] Furthermore, the upper inner plate includes a first inner plate and a second inner plate connected to each other, the second inner plate abutting against the muffler element; wherein the radial cross-sectional dimension of the air intake channel enclosed by the first inner plate gradually decreases towards the side closer to the second inner plate.

[0018] Furthermore, the upper surface of the first partition has a positioning rib and a first limiting rib extending toward the muffler cover, the positioning rib abutting against the upper inner plate; the positioning rib and the first limiting rib are arranged in a ring, and the positioning rib and the first limiting rib are coaxially arranged with the muffler channel; the axial height of the first limiting rib is greater than that of the positioning rib.

[0019] Furthermore, the lower surface of the second partition is provided with a second limiting rib extending toward the upper and lower covers of the muffler. The second limiting rib is arranged in a ring and is coaxially arranged with the muffler channel. There is a gap between the second limiting rib and the air outlet channel.

[0020] According to a second aspect of the embodiments of this specification, an engine is provided, including an air filter, a turbocharger, and a muffler structure as described in the first aspect, wherein the air filter is connected to the air intake passage on the upper cover of the muffler via a hose, and the turbocharger is connected to the air outlet passage on the lower body of the muffler via a hose.

[0021] This application has the following beneficial effects: Based on the silencing channel, this application adds an upper chamber, a middle chamber and a lower chamber that are interconnected. Airflow noise enters the upper chamber, the middle chamber and the lower chamber through the silencing channel and is transmitted and reflected between the chambers, weakening the noise energy and achieving the noise reduction effect.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.

[0024] Figure 1 This is a cross-sectional view of the sound-absorbing structure in an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the structure of the muffler cover in the embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the structure of the lower body of the muffler in the embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the muffler element in the embodiments of this application;

[0028] Figure 5 This is a schematic diagram of the muffler element from another perspective in the embodiments of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 10-Muffler top cover; 11-Upper inner plate; 111-Air intake passage; 112-First inner plate; 113-Second inner plate; 12-Upper outer plate; 13-Upper chamber;

[0031] 20 - Lower part of the muffler; 21 - Lower inner plate; 211 - Air outlet passage; 22 - Lower outer plate; 23 - Lower chamber;

[0032] 30-Silencer element; 31-Silencer pipe; 311-Silencer channel; 312-Silencer hole; 32-First partition; 321-First notch; 322-First reinforcing rib; 323-Positioning rib; 324-First limiting rib; 33-Second partition; 331-Second notch; 332-Second reinforcing rib; 333-Second limiting rib; 34-Central chamber. Detailed Implementation

[0033] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0034] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0035] The embodiments described in this specification will now be described in detail.

[0036] Reference Figure 1 As shown, this application discloses a noise reduction structure, which includes a muffler upper cover 10, a muffler lower body 20, and a muffler element 30. The muffler upper cover 10 and the muffler lower body 20 are closed together to form an airflow channel, and the muffler element 30 is placed inside the muffler lower body 20. The muffler upper cover 10 and the muffler lower body 20 can be fixed by welding, snap-fitting, screws, or other methods.

[0037] Please refer to the reference again. Figure 2 As shown, the muffler cover 10 includes an upper inner plate 11 and an upper outer plate 12. The upper inner plate 11 and the upper outer plate 12 are arranged in a ring and are connected to each other to form an inverted U-shaped structure. The upper inner plate 11 forms an air intake channel 111.

[0038] The upper inner plate 11 includes a first inner plate 112 and a second inner plate 113 that are connected to each other. The radial cross-sectional dimension of the air intake channel 111 enclosed by the first inner plate 112 gradually decreases towards the side closer to the second inner plate 113. In this way, the airflow entering the air intake channel 111 is sorted, accelerated and guided, so that the airflow is compressed and accelerated smoothly, and can enter the space of the subsequent muffler element 30 more concentratedly and smoothly.

[0039] The second inner plate 113 abuts against the muffler element 30, ensuring the airtightness between the two while allowing airflow to flow better from the intake channel 111 into the muffler element 30.

[0040] Please refer to the reference again. Figure 3 As shown, the lower body 20 of the muffler includes a lower inner plate 21 and a lower outer plate 22. The lower inner plate 21 and the lower outer plate 22 are arranged in a ring and are connected to each other to form an inverted U-shaped structure. The lower inner plate 21 forms an air outlet channel 211.

[0041] Considering that the muffler element 30 is located inside the lower muffler body 20, in this embodiment, the height of the lower outer plate 22 is greater than the height of the lower inner plate 21. Thus, the reduced height of the lower inner plate 21 compared to the lower outer plate 22 can be used to house the muffler element 30.

[0042] Please refer to the reference again. Figure 4 and Figure 5 As shown, the muffler element 30 includes a muffler pipe 31, a first partition 32, and a second partition 33. The muffler pipe 31 has a muffler channel 311 and a plurality of muffler holes 312, which include at least two shapes. In this embodiment, the muffler holes 312 are circular and irregular strip structures.

[0043] The silencer channel 311 is connected to the air intake channel 111 and the air outlet channel 211, so that the airflow can enter the silencer channel 311 of the silencer pipe 31 from the air intake channel 111, and then achieve silence treatment at the silencer channel 311, and finally flow out from the air outlet channel 211.

[0044] The first partition 32 is arranged on the outer wall of the silencer pipe 31, and together with the upper inner plate 11 and the upper outer plate 12, forms an upper chamber 13. The first partition 32, the second partition 33, and the lower outer plate 22 form a middle chamber 34. The second partition 33 is arranged on the outer wall of the silencer pipe 31, and together with the lower inner plate 21 and the lower outer plate 22, forms a lower chamber 23.

[0045] The silencing channel 311 is interconnected with the upper chamber 13, the middle chamber 34 and the lower chamber 23. In this way, the mid-to-high frequency airflow noise enters the upper chamber 13, the middle chamber 34 and the lower chamber 23 through the silencing channel 311 and is transmitted and reflected between the chambers, weakening the noise energy and achieving the noise reduction effect.

[0046] In this embodiment, the radial cross section of the silencing channel 311 is elliptical. The elliptical shape can change the propagation mode and resonant frequency of airflow sound in the silencing channel 311, which is beneficial to disperse or weaken noise peaks at certain specific frequencies.

[0047] The center of the ellipse is offset from the center of the muffler element 30. In this way, by making the center of the muffler channel 311 offset to one side, the high-speed airflow can be brought closer to the upper chamber 13, the middle chamber 34 and the lower chamber 23 and flow into the upper chamber 13, the middle chamber 34 and the lower chamber 23, thereby maximizing the utilization of the muffler chambers, improving the utilization efficiency of the muffler element 30 and the overall muffler performance, and preventing the airflow from flowing directly from the muffler channel 311 into the exhaust channel 211.

[0048] The first partition 32 has a plurality of first notches 321 at its edge away from the silencer pipe 31. The plurality of first notches 321 are spaced apart and penetrate the first partition 32 axially, thereby enabling the upper chamber 13 and the middle chamber 34 to communicate with each other. In other embodiments, the first notches 321 are arranged in the middle of the first partition 32.

[0049] The lower surface of the first partition 32 is provided with a plurality of spaced-apart first reinforcing ribs 322. The first reinforcing ribs 322 extend from the silencing channel 311 toward the central cavity 34 to strengthen the first partition 32 and prevent vibration and fatigue damage. In other embodiments, the first reinforcing ribs 322 are arranged on the upper surface of the first partition 32, or the first reinforcing ribs 322 are arranged on both the upper and lower surfaces of the first partition 32.

[0050] In this embodiment, a first notch 321 is arranged between the two first reinforcing ribs 322. The orientation of the two first reinforcing ribs 322 can provide guidance for the airflow entering the middle chamber 34 from the silencing channel 311, which helps to guide the airflow to diffuse more smoothly from the middle chamber 34 to the upper chamber 13, reducing the eddies and airflow separation caused by sudden expansion, thereby reducing airflow resistance (pressure loss) to a certain extent.

[0051] The upper surface of the first partition 32 has a positioning rib 323 and a first limiting rib 324 extending toward the muffler cover 10. The positioning rib 323 abuts against the upper inner plate 11. The positioning rib 323 and the first limiting rib 324 are arranged in a ring and are coaxial with the muffler channel 311. The first limiting rib 324 is located on the side away from the muffler channel 311, and the axial height of the first limiting rib 324 is greater than that of the positioning rib 323, thus restricting the radial movement of the muffler element 30 under the action of airflow.

[0052] The upper surface of the second partition 33 is provided with a plurality of spaced second reinforcing ribs 332, which extend from the silencing channel 311 toward the central chamber 34, thereby strengthening the second partition 33 and preventing vibration and fatigue damage. In other embodiments, the second reinforcing ribs 332 are arranged on the upper surface of the second partition 33, or the second reinforcing ribs 332 are arranged on both the upper and lower surfaces of the second partition 33.

[0053] The second partition 33 has multiple second notches 331 at its edge away from the silencer pipe 31. These multiple second notches 331 are spaced apart and extend axially through the second partition 33, thus enabling the middle chamber 34 and the lower chamber 23 to communicate with each other. In other embodiments, the second notches 331 are arranged in the middle of the second partition 33.

[0054] In this embodiment, a second notch 331 is arranged between the two second reinforcing ribs 332. The orientation of the two second reinforcing ribs 332 can provide guidance for the airflow entering the middle chamber 34 from the silencing channel 311, which helps to guide the airflow to diffuse more smoothly from the middle chamber 34 to the lower chamber 23, reduce the eddies and airflow separation caused by sudden expansion, and thus reduce the airflow resistance (pressure loss) to a certain extent.

[0055] The lower surface of the second partition 33 is provided with a second limiting rib 333 extending toward the lower body 20 of the muffler. The second limiting rib 333 is arranged in a ring and is coaxially arranged with the muffler channel 311. There is a gap between the second limiting rib 333 and the air outlet channel 211, so that the second limiting rib 333 and the lower surface of the second partition 33 form an L-shaped structure with an inverted cross section, which is used to position the installation between the muffler element 30 and the lower body 20 of the muffler, and also restricts the radial movement of the muffler element 30 under the action of airflow.

[0056] This application also discloses an engine including an air filter (not shown), a turbocharger (not shown), and a muffler structure. The air filter is connected to an intake passage 111 on the muffler cover 10 via a hose, and the turbocharger is connected to an exhaust passage 211 on the muffler lower body 20 via a hose.

[0057] In other embodiments, the two ends of the muffler structure can also be connected to other structures. For example, one end of the muffler structure can be connected to the exhaust outlet of the turbocharger, and the other end can be connected to an exhaust aftertreatment device or exhaust pipe to reduce engine exhaust pulse noise and achieve smooth airflow delivery. Specific details are not limited here.

[0058] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A sound-absorbing structure, characterized in that, It includes: The muffler cover includes an upper inner plate and an upper outer plate, wherein the upper inner plate forms an air intake channel; The lower body of the muffler includes a lower inner plate and a lower outer plate; the lower inner plate forms an air outlet channel; and A muffler element is disposed within the lower body of the muffler. The muffler element includes a muffler pipe, a first partition, and a second partition. The muffler pipe has a muffler channel that communicates with the air inlet channel and the air outlet channel. The first partition is disposed on the outer wall of the muffler pipe and, together with the upper inner plate and the upper outer plate, forms an upper chamber. The first partition, the second partition, and the lower outer plate form a middle chamber. The second partition is disposed on the outer wall of the muffler pipe and, together with the lower inner plate and the lower outer plate, forms a lower chamber. The silencing channel is interconnected with the upper chamber, the middle chamber, and the lower chamber.

2. The sound-absorbing structure according to claim 1, characterized in that, The silencer pipe is provided with a plurality of silencer holes, including at least two different shapes of silencer holes.

3. The sound-absorbing structure according to claim 1, characterized in that, The first partition plate has a plurality of first notches at its edge away from the silencer pipe, and the plurality of first notches are spaced apart and penetrate the first partition plate axially. The second partition has a plurality of second notches at its edge away from the silencer pipe, and the plurality of second notches are spaced apart and penetrate the second partition axially.

4. The sound-absorbing structure according to claim 1, characterized in that, The radial cross-section of the silencing channel is elliptical.

5. The sound-absorbing structure according to claim 4, characterized in that, The center of the ellipse is offset from the center of the muffler element.

6. The sound-absorbing structure according to claim 1, characterized in that, The lower surface of the first partition is provided with a plurality of spaced first reinforcing ribs, which extend from the silencing channel toward the middle cavity; The upper surface of the second partition is provided with a plurality of spaced second reinforcing ribs, which extend from the silencing channel toward the middle chamber.

7. The sound-absorbing structure according to claim 1, characterized in that, The upper inner plate includes a first inner plate and a second inner plate that are connected to each other, and the second inner plate abuts against the muffler element; wherein the radial cross-sectional dimension of the air intake channel enclosed by the first inner plate gradually decreases towards the side closer to the second inner plate.

8. The sound-absorbing structure according to claim 1, characterized in that, The upper surface of the first partition has a positioning rib and a first limiting rib extending toward the muffler cover, the positioning rib abutting against the upper inner plate; the positioning rib and the first limiting rib are arranged in a ring, and the positioning rib and the first limiting rib are coaxially arranged with the muffler channel; the first limiting rib is located on the side away from the muffler channel, and the axial height of the first limiting rib is greater than that of the positioning rib.

9. The sound-absorbing structure according to claim 1, characterized in that, The lower surface of the second partition is provided with a second limiting rib extending toward the lower body of the muffler. The second limiting rib is arranged in a ring and is coaxial with the muffler channel. There is a gap between the second limiting rib and the air outlet channel.

10. An engine, characterized in that, The device includes an air filter, a turbocharger, and a muffler structure as described in any one of claims 1-9, wherein the air filter is connected to the air intake passage on the upper cover of the muffler via a hose, and the turbocharger is connected to the air outlet passage on the lower body of the muffler via a hose.

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