Impedance composite silencer of low-resistance internal combustion engine

Abstract

The utility model relates to the technical field of internal combustion engines, and particularly discloses a low-resistance internal combustion engine impedance composite silencer which comprises a protection plate, an inlet, an outlet and a composite silencing assembly. The inlet and the outlet are formed in the two ends of the protection plate, and the composite silencing assembly is arranged in the protection plate. The inner penetrating pipe is detachably connected based on an inlet and an outlet, the first-stage resistant cavities are symmetrically arranged on the periphery of the inner penetrating pipe, a second-stage resistant cavity and a sound absorption cotton cavity are formed between the first-stage resistant cavities and the protection plate, the first-stage resistant cavities are symmetrically arranged based on the center line of the second-stage resistant cavity, and the second-stage resistant cavities are symmetrically arranged based on the center line of the second-stage resistant cavity. A plurality of penetrating holes for gas to enter the first-stage resistant cavity, the second-stage resistant cavity and the sound absorption cotton cavity are formed in the inner penetrating pipe, and the volume of the cavity in the first-stage resistant cavity is smaller than that of the cavity in the second-stage resistant cavity.

Description

Technical Field

[0001] This application relates to the field of internal combustion engine technology, and specifically discloses a low-resistance internal combustion engine impedance composite muffler. Background Technology

[0002] The main function of an internal combustion engine exhaust muffler is to reduce exhaust noise generated by the unit and reduce noise pollution. The lower the flow resistance, the smoother the exhaust, and the less power loss during the exhaust process of the internal combustion engine. This helps to improve the effective power of the internal combustion engine, especially under high speed and high load conditions, where the advantages are more obvious.

[0003] Traditional internal combustion engine exhaust mufflers typically employ reactive or resistive mufflers, which offer good low-frequency noise reduction, but reactive mufflers have high flow resistance. Resistive mufflers, on the other hand, have lower flow resistance and offer better high-frequency noise reduction, but their effect on low-frequency noise reduction is only moderate. While conventional impedance composite mufflers address wideband noise, they still result in significant exhaust flow resistance. To address these issues, a low-resistance internal combustion engine impedance composite muffler is proposed, aiming to solve the problem of balancing wideband noise reduction and low flow resistance.

[0004] This invention provides a low-resistance internal combustion engine impedance composite muffler to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to solve the problem of balancing wideband noise reduction and low flow resistance.

[0006] To achieve the above objectives, this utility model provides the following basic solution:

[0007] A low-resistance internal combustion engine impedance composite muffler includes a protective plate, an inlet and an outlet disposed at both ends of the protective plate, and a composite muffler assembly disposed inside the protective plate.

[0008] Composite silencing component: includes an inner tube with detachable inlet and outlet, primary resistive cavities symmetrically arranged around the outer periphery of the inner tube, secondary resistive cavities formed by the primary resistive cavities and a protective plate, and a sound-absorbing cotton cavity. The primary resistive cavities are symmetrically arranged based on the centerline of the secondary resistive cavities. The inner tube has several inlet holes for gas to enter the primary resistive cavities, secondary resistive cavities and sound-absorbing cotton cavities. The cavity volume inside the primary resistive cavities is smaller than the cavity volume inside the secondary resistive cavities.

[0009] Furthermore, the inlet and outlet are integrally formed with the protective plate, the inner tube passes through the interior of the protective plate, and the two ends of the inner tube are in contact with the inlet and outlet respectively. Connecting components are provided at the inlet and outlet positions, and the connecting components connect the inner tube and the protective plate.

[0010] Furthermore, the connecting assembly consists of several connecting screws, which pass through the inner tube and connect to the inlet and outlet positions. Gaskets are provided at the connection points between the connecting screws and the inner tube at the inlet and outlet positions, and the connecting screws contact the gaskets.

[0011] Furthermore, the outer periphery of the inner tube is provided with a first circular plate, a second circular plate, a third circular plate and a fourth circular plate in sequence. A sleeve is provided between the first circular plate and the second circular plate and between the third circular plate and the fourth circular plate. An annular plate is provided inside the sleeve. The annular plate, the sleeve, the first circular plate, the second circular plate and the annular plate, the sleeve and the third circular plate and the fourth circular plate form a primary resistance cavity.

[0012] Furthermore, the second circular plate, the third circular plate, and the protective plate together form a secondary resistance cavity, and the first circular plate and the protective plate near the inlet side and the fourth circular plate and the protective plate near the outlet side together form a sound-absorbing cotton cavity.

[0013] Furthermore, the cavity of the sound-absorbing cotton is filled with sound-absorbing cotton.

[0014] Furthermore, the internal cavity space formed by the annular plate separating the sleeve and the inner tube has a cavity volume ratio of 1:1.

[0015] The principle and effect of this solution are as follows:

[0016] Compared with existing technologies, this solution achieves gas exchange through an internal tube and perforations, and is applied to both primary and secondary reactive cavities, achieving a low-resistance impedance combination. This solution uses unequal-volume cavities within the primary and secondary reactive cavities to achieve wide-band noise reduction. The internal tube is a continuous structure, with perforations facilitating airflow exchange. Combined with the primary and secondary reactive cavities, it forms a reactive cavity, significantly reducing flow resistance. Furthermore, the entire system is symmetrically arranged, increasing noise absorption across all frequency bands. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This paper shows a schematic diagram of the structure of a low-resistance internal combustion engine impedance composite muffler according to an embodiment of this application;

[0019] Figure 2This paper shows a cross-sectional schematic diagram of a low-resistance internal combustion engine impedance composite muffler according to an embodiment of this application;

[0020] Figure 3 This application illustrates a low-resistance internal combustion engine impedance composite muffler according to an embodiment of the present application. Figure 1 A schematic diagram of the internal structure without the protective panel;

[0021] Figure 4 This application illustrates a low-resistance internal combustion engine impedance composite muffler according to an embodiment of the present application. Figure 2 A frontal view of the cross-section. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0023] The reference numerals in the accompanying drawings include: 1. Protective plate; 2. Outlet; 3. Connecting screw; 4. Inlet; 5. Inner tube; 6. Airflow guide; 7. Front sound-absorbing cotton cavity; 8. End sound-absorbing cotton cavity; 9. Secondary resistance cavity; 10. Ring plate; 11. Primary resistance cavity; 12. First circular plate; 13. Second circular plate; 14. Third circular plate; 15. Fourth circular plate; 16. Penetration hole.

[0024] Implementation, for example Figures 1-4 As shown:

[0025] A low-resistance internal combustion engine impedance composite muffler includes a protective plate 1, an inlet 4 and an outlet 2 disposed at both ends of the protective plate 1, and a composite muffler assembly disposed inside the protective plate 1; the protective plate 1 is integrally formed by welding the inlet 4 and the outlet 2.

[0026] Composite noise reduction assembly: includes an inner tube 5 detachably connected to an inlet 4 and an outlet 2, primary resistance cavities 11 symmetrically arranged around the outer periphery of the inner tube 5, a secondary resistance cavity 9 formed between the primary resistance cavities 11 and the protective plate 1, and a sound-absorbing cotton cavity. The primary resistance cavities 11 are symmetrically arranged based on the centerline of the secondary resistance cavities 9. The inner tube 5 has several inlet holes 16 for gas to enter the primary resistance cavities 11, the secondary resistance cavities 9, and the sound-absorbing cotton cavity. The cavity volume inside the primary resistance cavity 11 is smaller than the cavity volume inside the secondary resistance cavity 9.

[0027] An inner tube 5 penetrates the interior of the protective plate 1. Both ends of the inner tube 5 contact the inlet 4 and the outlet 2, respectively. Connecting components are provided at the inlet 4 and the outlet 2, connecting the inner tube 5 and the protective plate 1. Figure 2As shown, the connecting assembly consists of several connecting screws 3. The connecting screws 3 pass through the inner tube 5 and are connected to the inlet 4 and outlet 2. Gaskets are provided at the connection points between the inlet 4 and outlet 2 and the inner tube 5, and the connecting screws 3 are in contact with the gaskets.

[0028] Regarding the primary resistance cavity 11, the secondary resistance cavity 9, and the sound-absorbing cotton cavity:

[0029] A first circular plate 12, a second circular plate 13, a third circular plate 14, and a fourth circular plate 15 are sequentially arranged around the outer periphery of the inner tube 5. The outer rings of the first circular plate 12, the second circular plate 13, the third circular plate 14, and the fourth circular plate 15 are welded to the inner wall of the protective plate 1. The inner rings of the first circular plate 12, the second circular plate 13, the third circular plate 14, and the fourth circular plate 15 are welded to the outer periphery of the inner tube 5. Sleeves are provided between the first circular plate 12 and the second circular plate 13, and between the third circular plate 14 and the fourth circular plate 15. The two ends of the sleeves are also welded. An annular plate 10 is provided inside the sleeve. The two ends of the annular plate 10 are welded to the inner wall of the sleeve. The sleeve, the first circular plate 12, the second circular plate 13, the ring plate 10, the sleeve, the third circular plate 14, and the fourth circular plate 15 form a primary resistance cavity 11. The second circular plate 13, the third circular plate 14, and the protective plate 1 form a secondary resistance cavity 9. The first circular plate 12 and the protective plate 1 near the inlet 4 and the fourth circular plate 15 and the protective plate 1 near the outlet 2 form a sound-absorbing cotton cavity. The cavity is filled with sound-absorbing cotton. The sound-absorbing cotton cavity consists of a front sound-absorbing cotton cavity 7 and a rear sound-absorbing cotton cavity 8. The front sound-absorbing cotton cavity 7 is near the inlet 4, and the rear sound-absorbing cotton cavity 8 is near the outlet 2.

[0030] Using the bisector of the secondary resistive cavity 9 as the line of symmetry, two sets of primary resistive cavities 11 are symmetrically arranged based on this line of symmetry. The ring plate 10 separates the internal cavity space composed of the sleeve and the inner tube 5, and the ratio of the cavity volume is 1:1. Due to the arrangement of the ring plate 10, the internal cavity space of the primary resistive cavity 11 is smaller than the internal cavity volume of the secondary resistive cavity 9. By forming cavities with unequal volumes, wide-screen band noise reduction is achieved.

[0031] like Figure 2 As shown, an airflow guide 6 is provided, which guides the airflow from the inlet 4 to the outlet 2. Because the inner tube 5 has several inlet holes 16 for the gas to enter the primary resistance cavity 11, the secondary resistance cavity 9 and the sound-absorbing cotton cavity, the gas enters the primary resistance cavity 11, the secondary resistance cavity 9 and the sound-absorbing cotton cavity through the inlet holes 16. Combined with the structure of the primary resistance cavity 11 and the secondary resistance cavity 9, a resistance cavity is formed, which greatly reduces the flow resistance.

[0032] Ultimately, this structure solves the problem of balancing wideband noise reduction and low flow resistance.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A low-resistance internal combustion engine impedance composite muffler, characterized in that, It includes a protective plate, an inlet and an outlet located at both ends of the protective plate, and a composite sound-absorbing component located inside the protective plate; Composite silencing component: includes an inner tube with detachable inlet and outlet, primary resistive cavities symmetrically arranged around the outer periphery of the inner tube, secondary resistive cavities formed by the primary resistive cavities and a protective plate, and a sound-absorbing cotton cavity. The primary resistive cavities are symmetrically arranged based on the centerline of the secondary resistive cavities. The inner tube has several inlet holes for gas to enter the primary resistive cavities, secondary resistive cavities and sound-absorbing cotton cavities. The cavity volume inside the primary resistive cavities is smaller than the cavity volume inside the secondary resistive cavities.

2. The low-resistance internal combustion engine impedance composite muffler according to claim 1, characterized in that, The inlet and outlet are integrally formed with the protective plate. The inner tube passes through the interior of the protective plate. The two ends of the inner tube are in contact with the inlet and outlet, respectively. Connecting components are provided at the inlet and outlet positions, and the connecting components connect the inner tube and the protective plate.

3. The low-resistance internal combustion engine impedance composite muffler according to claim 2, characterized in that, The connecting assembly consists of several connecting screws, which pass through the inner tube and connect to the inlet and outlet positions. Gaskets are provided at the connection points between the connecting screws and the inner tube at the inlet and outlet positions, and the connecting screws contact the gaskets.

4. A low-resistance internal combustion engine impedance composite muffler according to claim 2, characterized in that, The outer periphery of the inner tube is provided with a first circular plate, a second circular plate, a third circular plate and a fourth circular plate in sequence. A sleeve is provided between the first circular plate and the second circular plate and between the third circular plate and the fourth circular plate. An annular plate is provided inside the sleeve. The annular plate, the sleeve, the first circular plate, the second circular plate and the annular plate, the sleeve and the third circular plate and the fourth circular plate form a primary resistance cavity.

5. A low-resistance internal combustion engine impedance composite muffler according to claim 4, characterized in that, The second circular plate, the third circular plate, and the protective plate together form a secondary resistance cavity. The first circular plate and the protective plate near the inlet side and the fourth circular plate and the protective plate near the outlet side together form a sound-absorbing cotton cavity.

6. A low-resistance internal combustion engine impedance composite muffler according to claim 5, characterized in that, The cavity of the sound-absorbing cotton is filled with sound-absorbing cotton.

7. A low-resistance internal combustion engine impedance composite muffler according to claim 5, characterized in that, The internal cavity space formed by the annular plate separating the sleeve and the inner tube has a cavity volume ratio of 1:1.

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