A symmetrical reverse exhaust muffler

Abstract

This utility model discloses a symmetrical reverse exhaust muffler, including a lower muffler cover and an upper muffler cover. The lower muffler cover and the upper muffler cover are connected, forming an internal cavity between them. It also includes an inner exhaust baffle and an outer exhaust baffle. The inner exhaust baffle is connected to the inner side of the upper muffler cover, and the outer exhaust baffle is connected to the outer side of the upper muffler cover, positioned between the upper muffler cover and the exhaust pipe. The inner exhaust baffle has one exhaust port, and the outer exhaust baffle has two exhaust ports, with the first and second exhaust ports facing opposite directions. This utility model has a simple structure and is easy to use. Through the symmetrically arranged inner and outer exhaust baffles, multiple changes in airflow direction and deceleration are achieved, extending the muffler path and further improving the muffler effect.

Description

Technical Field

[0001] This utility model relates to the field of muffler technology, and in particular to a small general-purpose gasoline engine symmetrical reverse exhaust muffler. Background Technology

[0002] Exhaust noise is the main noise source of small general-purpose gasoline engines, and the muffler, as an important component of small general-purpose gasoline engines, plays a role in reducing noise. Existing mufflers form a multi-chamber structure through the muffler housing and partitions, utilizing the reflection and interference effects of sound waves and extending the muffler path to achieve the purpose of noise reduction.

[0003] The utility model patent with application number 202321076099.4 discloses a general-purpose gasoline engine muffler, including a left housing with an exhaust gas inlet and a right housing with an exhaust port. A chamber Ⅲ formed by a left partition and a right partition divides the chamber composed of the left housing and the right housing into chamber Ⅰ and chamber Ⅱ. An exhaust port is provided on the right partition and the right housing. An exhaust pipe is inserted into chamber Ⅱ, with one end connected to the right partition and the other end connected to the right housing, connecting chamber Ⅲ to the outside. Ventilation holes are provided on the left partition and the right partition to connect chamber Ⅰ, chamber Ⅱ and chamber Ⅲ.

[0004] The aforementioned silencers utilize the reflection and interference effects of sound waves and extend the silencing path, but their noise reduction effect still needs further improvement. Summary of the Invention

[0005] The problem to be solved by this utility model is to provide a small general-purpose gasoline engine muffler that achieves a noise reduction effect by using abrupt changes in cross section and changes in chamber to buffer the airflow sound waves in multiple stages.

[0006] To solve the above-mentioned technical problems, this utility model provides a symmetrical reverse exhaust muffler, including a lower muffler cover and a higher muffler cover. The lower muffler cover is connected to the higher muffler cover, and an internal cavity is formed between the lower muffler cover and the higher muffler cover. It also includes an inner exhaust baffle and an outer exhaust baffle. The inner exhaust baffle is connected to the inner side of the upper muffler cover, and the outer exhaust baffle is connected to the outer side of the upper muffler cover. It is disposed between the upper muffler cover and the exhaust pipe. The inner exhaust baffle is provided with an exhaust port one, and the outer exhaust baffle is provided with an exhaust port two. The directions of the exhaust port one and the exhaust port two are opposite.

[0007] Furthermore, the symmetrical reverse exhaust muffler also includes a muffler partition, which is disposed between the lower cover and the upper cover of the muffler. The muffler partition and the lower cover of the muffler form chamber I, and the muffler partition and the upper cover of the muffler form chamber II.

[0008] Furthermore, the silencer partition is provided with a sound-absorbing and reflecting cavity and multiple sound-absorbing holes, and the chamber I and chamber II are connected through the sound-absorbing holes.

[0009] Furthermore, the exhaust inner baffle is disposed in chamber II, and chamber III is formed between the exhaust inner baffle and the muffler cover.

[0010] Furthermore, the symmetrical reverse exhaust muffler also includes an exhaust pipe, which is connected to the outside of the muffler cover, and a chamber V is formed between the exhaust pipe and the muffler cover.

[0011] Furthermore, the exhaust outer baffle is disposed in chamber V, and chamber IV is formed between the exhaust outer baffle and the muffler cover.

[0012] Furthermore, the muffler cover is provided with multiple exhaust holes, and chamber III and chamber IV are connected through the exhaust holes.

[0013] Furthermore, fireproof netting is installed at exhaust port one and exhaust port two.

[0014] Furthermore, the exhaust pipe is provided with an exhaust port three, which is oriented outward along the axis.

[0015] This invention boasts advantages such as ingenious structural design, low manufacturing cost, and high reliability. By altering the vibration frequency of the exhaust gas through chamber changes, it progressively changes the airflow sound frequency. Multiple abrupt changes in airflow direction and deceleration extend the silencing path, thereby improving noise reduction. Simultaneously, its compact structure reduces component weight and enhances the overall compactness of the device. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, are intended to explain the present invention and do not constitute an undue limitation thereof.

[0017] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0018] Figure 2 This is an exploded view of the structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the exhaust inner baffle structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the exhaust outer partition structure of this utility model.

[0022] The numbers in the attached diagram are explained as follows: 1. Lower cover of the muffler; 2. Flange; 3. Support pipe; 4. Muffler baffle; 5. Inner exhaust baffle; 6. Upper cover of the muffler; 7. Fireproof mesh; 8. Exhaust port gasket; 9. Outer exhaust baffle; 10. Exhaust pipe; 11. Screw; 12. Vent hole; 13. Vent hole; 14. Exhaust port; 15. Exhaust hole; 16. Exhaust port; 17. Exhaust port; 18. Chamber I; 19. Chamber II; 20. Sound absorption and reflection cavity; 21. Chamber III; 22. Chamber IV; 23. Chamber V. Detailed Implementation

[0023] It should be noted that the directional terms that may be used in the following paragraphs, including but not limited to "up, down, left, right, front, back, inside, outside", are all based on the view orientation shown in the accompanying drawings of the specification. Their purpose is only to help those skilled in the art better understand the technical solution of this utility model, and they should not be regarded as a limitation on the protection scope or technical solution of this utility model.

[0024] It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "assembly," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1 , Figure 2 As shown, a symmetrical reverse exhaust muffler includes a lower muffler cover 1 and an upper muffler cover 6. The lower muffler cover 1 and the upper muffler cover 6 are connected, forming an internal cavity between them. The lower muffler cover 1 is provided with a flange 2, and the lower muffler cover 1 and the upper muffler cover 6 are supported by the flange 2 and a support pipe 3. The symmetrical reverse exhaust muffler also includes an inner exhaust baffle 5 and an outer exhaust baffle 9. The inner exhaust baffle 5 is connected to the inner side of the upper muffler cover 6, and the outer exhaust baffle 9 is connected to the outer side of the upper muffler cover 6. It is disposed between the upper muffler cover 6 and the exhaust pipe 10. The inner exhaust baffle 5 is provided with an exhaust port 14, and the outer exhaust baffle 9 is provided with an exhaust port 26. The exhaust port 14 and the exhaust port 26 are in opposite directions. The symmetrical reverse exhaust muffler also includes a muffler partition 4, which is disposed between the lower muffler cover 1 and the upper muffler cover 6.

[0027] like Figure 2 , Figure 3As shown, the muffler partition 4 and the lower muffler cover 1 form chamber I 18, and the muffler partition 4 and the upper muffler cover 6 form chamber II 19. The muffler partition 4 is provided with a sound-absorbing and reflecting cavity 20 and multiple silencing holes 13. Chambers I 18 and II 19 are placed in chamber II 19 through silencing. The inner exhaust partition 5 and the upper muffler cover 6 form chamber III 21. The symmetrical reverse exhaust muffler also includes an exhaust pipe 10, which is connected to the outside of the upper muffler cover 6, forming chamber V 23 between the exhaust pipe 10 and the upper muffler cover 6. The outer exhaust partition 9 is disposed within chamber V 23, forming chamber IV 22 between the outer exhaust partition 9 and the upper muffler cover 6. The upper muffler cover 6 is provided with multiple exhaust holes 15, and chambers III 21 and IV 22 are connected through the exhaust holes 15. A fireproof mesh 7 and an exhaust port gasket 8 are installed between the muffler cover 6 and the exhaust outer partition 9. Fireproof meshes can be installed at exhaust port 14 and exhaust port 26. The exhaust pipe 10 is provided with exhaust port 3 17, which is oriented outward along the axis. The exhaust pipe 10, exhaust outer partition 9, exhaust port gasket 8, and fireproof mesh 7 are fastened to the muffler cover 6 with screws 11.

[0028] like Figure 3 As shown, the exhaust gas enters chamber I 18 through the vent 12, enters chamber II 19 through the silencer hole 13 on the silencer baffle 4, enters chamber III 21 through the exhaust port 14 on the inner exhaust baffle 5, enters chamber IV 22 through the exhaust port 15 on the upper cover of the silencer 6, enters chamber V 23 through the exhaust port 2 16 on the outer exhaust baffle 9, and is finally discharged through the exhaust port 3 17 on the exhaust pipe 10.

[0029] Specifically, after the high-pressure, high-speed airflow enters chamber I18, its vibration is amplified and altered within the chamber. Then, it passes through the sound-absorbing and reflecting cavity 20 on the partition 4, which changes its direction, causing mutual interference, friction, and cancellation among the airflows, thus slowing them down. After multiple reflections, it enters chamber II19 through the abruptly changing sound-absorbing hole 13. The airflow entering chamber II19 is again amplified within the chamber, changing its vibration frequency and further reducing its speed. The airflow enters chamber III21 through exhaust port 14 on the inner exhaust baffle 5, at which point the airflow direction changes from axial to radial. The airflow then enters chamber IV22 through exhaust port 15 on the muffler cover 6, at which point the airflow direction changes from radial to axial again. The airflow then enters chamber V23 through exhaust port 16 on the outer exhaust baffle 9, at which point the airflow direction changes from axial to radial again. Finally, the airflow is discharged through exhaust port 17 on the exhaust pipe 10, at which point the airflow direction changes from radial to axial again. Because the exhaust port 14 on the inner exhaust baffle 5 and the exhaust port 16 on the outer exhaust baffle 9 are arranged symmetrically and in opposite directions, the airflow undergoes multiple directional changes and decelerations as it passes through exhaust port 14, exhaust port 15, exhaust port 16, and exhaust port 17, thus extending the silencing path and further improving the silencing effect.

[0030] The above figures and descriptions represent only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A symmetrical reverse exhaust muffler, comprising a muffler lower cover (1) and a muffler upper cover (6), the muffler lower cover (1) is connected with the muffler upper cover (6), and an internal cavity is formed between the muffler lower cover (1) and the muffler upper cover (6), characterized in that: It also includes an inner exhaust partition (5) and an outer exhaust partition (9). The inner exhaust partition (5) is connected to the inner side of the muffler cover (6), and the outer exhaust partition (9) is connected to the outer side of the muffler cover (6). It is located between the muffler cover (6) and the exhaust pipe (10). The inner exhaust partition (5) is provided with an exhaust port one (14), and the outer exhaust partition (9) is provided with an exhaust port two (16). The exhaust port one (14) and the exhaust port two (16) are in opposite directions.

2. The symmetric reverse exhaust muffler of claim 1, wherein: It also includes a muffler partition (4), which is disposed between the lower cover (1) and the upper cover (6) of the muffler. The muffler partition (4) and the lower cover (1) of the muffler form chamber I (18), and the muffler partition (4) and the upper cover (6) of the muffler form chamber II (19).

3. The symmetrical reverse exhaust muffler according to claim 2, characterized in that: The silencer partition (4) is provided with a sound-absorbing and reflecting cavity (20) and multiple silencer holes (13). The chamber I (18) and the chamber II (19) are connected through the silencer holes (13).

4. The symmetric reverse exhaust muffler of claim 3, wherein: The exhaust inner baffle (5) is disposed in chamber II (19), and chamber III (21) is formed between the exhaust inner baffle (5) and the muffler cover (6).

5. The symmetric reverse exhaust muffler of claim 4, wherein: It also includes an exhaust pipe (10) connected to the outside of the muffler cover (6), and a chamber V (23) is formed between the exhaust pipe (10) and the muffler cover (6).

6. The symmetric reverse exhaust muffler of claim 5, wherein: The exhaust outer partition (9) is disposed in chamber V (23), and chamber IV (22) is formed between the exhaust outer partition (9) and the muffler cover (6).

7. The symmetric reverse exhaust muffler of claim 6, wherein: The muffler cover (6) is provided with multiple exhaust holes (15), and the chamber III (21) and chamber IV (22) are connected through the exhaust holes (15).

8. The symmetric reverse exhaust muffler of claim 7, wherein: Fireproof nets are installed at the exhaust port one (14) and exhaust port two (16).

9. Symmetric reverse exhaust silencer according to any of claims 1-8, characterized in that: The exhaust pipe (10) is provided with an exhaust port three (17), and the exhaust port three (17) is oriented outward along the axis.

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