A muffler for a racing car exhaust

Abstract

The present invention discloses a racing exhaust muffler, which includes an exhaust pipe housing, a main exhaust pipe, and a back pressure branch pipe. The exhaust pipe housing is sleeved outside the main exhaust pipe. A plurality of partitions are sequentially distributed along the axial direction inside the exhaust pipe housing. The partitions sequentially divide the space between the exhaust pipe housing and the main exhaust pipe into a plurality of chambers along the axial direction. The plurality of chambers are respectively a first sound-absorbing chamber, an expansion chamber, a back pressure chamber, and a second sound-absorbing chamber. A plurality of through holes are provided on the expansion chamber partition between the expansion chamber and the back pressure chamber. A spoiler port and a back pressure branch pipe are sequentially provided on the main exhaust pipe. The spoiler port and the back pressure branch pipe are respectively arranged in the expansion chamber and the back pressure chamber. A valve is provided at the connection between the main exhaust pipe and the back pressure branch pipe. The present invention improves the power performance of the racing car under various rotational speeds, reduces the noise of the racing car, and improves the performance of the racing car.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle exhaust mufflers, and particularly relates to a racing exhaust muffler. Background Art

[0002] Engine combustion state at low engine speeds: Due to the low speed, the temperature of the air-fuel mixture is not high enough, resulting in incomplete combustion of the air-fuel mixture. Generally, the combustion of gasoline engines at speeds below 3000 rpm is incomplete. When the engine ignites, the piston starts the power stroke, and the exhaust valve will open before the piston reaches the bottom dead center. Multi-carbon molecules that have not fully released their energy will be squeezed into the intake port and the exhaust valve during the valve overlap period, and then will be instantly inhaled into the cylinder again by the piston during the intake stroke to participate in the next combustion stroke. Compared with fresh gasoline molecules, these multi-carbon molecules remaining from the previous combustion are easier to ignite because they have fewer carbon chains and smaller molecules.

[0003] At high engine speeds: When the engine is at high speed, the air-fuel mixture is fully burned, and basically useless exhaust gas is generated, which is not helpful for the next cycle of combustion work. When using the original factory exhaust, the exhaust system will prevent these useless exhaust gases from being discharged and generate a certain amount of backpressure. Since the exhaust passage is not smooth, a certain amount of useless exhaust gas will be pressed into the intake port during the valve overlap period and then inhaled into the cylinder again. Due to the inhalation of non-combustible exhaust gas, the amount of combustible fresh air-fuel mixture entering the cylinder is reduced. Therefore, at high speeds, a straight-through exhaust is more beneficial for the power performance of the engine.

[0004] In order to make the racing car adapt to more working conditions, the present design uses the form of a variable exhaust muffler to make the exhaust system of the whole racing car more powerful at low speeds and smoother at high speeds. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a racing exhaust muffler, aiming at the above-mentioned defects existing in the prior art, to improve the power performance of the racing car under various speed conditions, reduce the noise of the racing car, and improve the performance of the racing car.

[0006] The technical solution adopted by the present invention to solve the above technical problem is:

[0007] A racing car exhaust muffler, comprising an exhaust pipe housing, a main exhaust pipe, and a backpressure branch pipe. The exhaust pipe housing is sleeved outside the main exhaust pipe. Inside the exhaust pipe housing, a plurality of partition plates are axially distributed in sequence. The partition plates sequentially divide the space between the exhaust pipe housing and the main exhaust pipe into a plurality of chambers along the axial direction. The plurality of chambers are respectively a first sound-absorbing chamber, an expansion chamber, a backpressure chamber, and a second sound-absorbing chamber. A plurality of through holes are provided on the expansion chamber partition plate between the expansion chamber and the backpressure chamber. A spoiler port and a backpressure branch pipe are sequentially provided on the main exhaust pipe. The spoiler port and the backpressure branch pipe are respectively arranged in the expansion chamber and the backpressure chamber. A valve is provided at the connection of the main exhaust pipe and the backpressure branch pipe.

[0008] According to the above technical solution, a plurality of holes are distributed on the wall of the main exhaust pipe. The plurality of holes on the main exhaust pipe are divided into multiple groups and are respectively arranged in the first sound-absorbing chamber, the backpressure chamber, and the second sound-absorbing chamber.

[0009] According to the above technical solution, a plurality of holes are also arranged on the wall of the backpressure branch pipe.

[0010] According to the above technical solution, the backpressure branch pipe is arranged parallel to the main exhaust pipe. The holes on the backpressure branch pipe and the holes on the main exhaust pipe in the backpressure chamber are arranged side by side and opposite to each other.

[0011] According to the above technical solution, the shape of the hole is any one of a circle, a square, and a triangle.

[0012] According to the above technical solution, sound-absorbing cotton is filled in the first sound-absorbing chamber and the second sound-absorbing chamber.

[0013] According to the above technical solution, a clamping groove is provided on the inner wall of the exhaust pipe housing. The partition plate is arranged on the exhaust pipe housing through the clamping groove to prevent the partition plate from shaking.

[0014] According to the above technical solution, the partition plates at both ends of the first sound-absorbing chamber are respectively the top cover of the first sound-absorbing chamber and the bottom plate of the first sound-absorbing chamber. The partition plates at both ends of the second sound-absorbing chamber are respectively the top cover of the second sound-absorbing chamber and the bottom plate of the second sound-absorbing chamber.

[0015] According to the above technical solution, the valve is an electromagnetic valve.

[0016] According to the above technical solution, the number of backpressure branch pipes is 2. The 2 backpressure branch pipes are symmetrically arranged on both sides of the main exhaust pipe. The tail end of the backpressure branch pipe is connected to the main exhaust pipe through a 90° elbow.

[0017] The present invention has the following beneficial effects:

[0018] The present invention switches the muffler between two exhaust paths by controlling the valve. The two exhaust paths are respectively a straight path and a backpressure branch pipe path, improving the power performance of the racing car under various rotational speeds, reducing the noise of the racing car, and improving the performance of the racing car. It is particularly suitable for the exhaust muffler of FSAE racing cars. Description of the Drawings

[0019] Figure 1 is the front view of the racing car exhaust muffler in the embodiment of the present invention;

[0020] Figure 2 is Figure 1 the A-A sectional view of;

[0021] Figure 3 is the elevation view of the racing car exhaust muffler in the embodiment of the present invention;

[0022] Figure 4 is the elevation view of the racing car exhaust muffler after removing the exhaust pipe housing in the embodiment of the present invention;

[0023] In the figure, 1 - top cover of the first sound absorption chamber, 2 - bottom plate of the first sound absorption chamber, 3 - expansion chamber partition, 4 - bottom plate of the second sound absorption chamber, 5 - top cover of the second sound absorption chamber, 6 - back pressure branch pipe, 7 - main exhaust pipe, 8 - turbulence port, 9 - valve, 10 - exhaust pipe housing, 11 - first sound absorption chamber, 12 - expansion chamber, 13 - back pressure chamber, 14 - second sound absorption chamber. Detailed Description of the Invention

[0024] The present invention will be described in detail below with reference to the drawings and embodiments.

[0025] Referring to Figures 1 to 4 as shown, the racing car exhaust muffler in an embodiment provided by the present invention is characterized in that it includes an exhaust pipe housing 10, a main exhaust pipe 7 and a back pressure branch pipe 6. The exhaust pipe housing 10 is sleeved outside the main exhaust pipe 7. A plurality of partitions are sequentially distributed along the axial direction inside the exhaust pipe housing 10. The partitions sequentially divide the space between the exhaust pipe housing 10 and the main exhaust pipe 7 into a plurality of chambers along the axial direction. The plurality of chambers are respectively a first sound absorption chamber 11, an expansion chamber 12, a back pressure chamber 13 and a second sound absorption chamber 14. A plurality of through holes are provided on the expansion chamber partition 3 between the expansion chamber 12 and the back pressure chamber 13. A turbulence port 8 and a back pressure branch pipe 6 are sequentially provided on the main exhaust pipe 7. The turbulence port 8 and the back pressure branch pipe 6 are respectively arranged in the expansion chamber 12 and the back pressure chamber 13. A valve 9 is provided at the connection between the main exhaust pipe 7 and the back pressure branch pipe 6.

[0026] Further, a plurality of holes are distributed on the pipe wall of the main exhaust pipe 7. The plurality of holes on the main exhaust pipe are divided into multiple groups and are respectively arranged in the first sound absorption chamber 11, the back pressure chamber 13 and the second sound absorption chamber 14.

[0027] Further, a plurality of holes are also arranged on the pipe wall of the back pressure branch pipe 6.

[0028] Furthermore, the back-pressure branch pipe 6 is arranged in parallel with the main exhaust pipe 7 , and the holes on the back-pressure branch pipe 6 and the holes on the main exhaust pipe 7 in the back-pressure chamber 13 are arranged side by side and opposite to each other.

[0029] Furthermore, the shape of the hole is any one of a circle, a direction and a triangle.

[0030] Furthermore, the first silencing chamber 11 and the second silencing chamber 14 are filled with sound insulation cotton.

[0031] Furthermore, a slot is provided on the inner wall of the exhaust pipe housing 10, and the partition is arranged on the exhaust pipe housing 10 through the slot to prevent the partition from shaking.

[0032] Furthermore, the partitions at both ends of the first muffler chamber 11 are respectively the first muffler chamber top cover 1 and the first muffler chamber bottom plate 2 , and the partitions at both ends of the second muffler chamber 14 are respectively the second muffler chamber top cover 5 and the second muffler chamber bottom plate 4 .

[0033] Furthermore, the valve 9 is an electromagnetic valve.

[0034] Furthermore, there are two back-pressure branch pipes 6 , which are symmetrically arranged on both sides of the main exhaust pipe 7 , and the tail ends of the back-pressure branch pipes 6 are connected to the main exhaust pipe 7 through a 90° elbow.

[0035] Working principle of the present invention: Figure 1 and Figure 2 As shown, the present invention provides an exhaust muffler for racing cars. Initially, when the valve 9 is opened, the back pressure chamber does not work. At this time, the exhaust muffler is completely a straight-through muffler. The exhaust gas flows in from the inlet end and flows out from the outlet end through the straight flow channel of the main exhaust pipe 7. At this time, since the entire main exhaust pipe 7 is a straight-through structure, the airflow leaked from the spoiler port 8 is very small and can be ignored. It is suitable for exhaust conditions under high speed; when the valve 9 is closed, the return structure formed by the back pressure branch pipe 6 of the muffler plays a major role. A part of the airflow flows out from the spoiler port 8. The sudden increase in the cross-sectional area is used to disturb the airflow and offset the sound wave energy. After the gas enters the expansion chamber 12, it enters the expansion chamber with a back pressure structure (i.e., enters the back pressure chamber) through the small holes of the expansion chamber partition 3 from the expansion chamber 12, and the other part of the gas flows out from the small holes on the wall of the main exhaust pipe 7. The two parts of the airflow flow in from the small holes on the wall of the back pressure branch pipe 6 together, and finally enter the tail of the main exhaust pipe through the back pressure branch pipe and flow out from the exhaust outlet end, thereby improving the low-speed torque performance.

[0036] The muffler has a significant noise reduction effect, meeting the design goal of 100 decibels below 3000rpm. The final test result is 98 decibels. The test value of noise at high speed is 100 decibels, which is far below the standard of the Formula Student rules. After the process, the conclusion consistent with the initial design principle was obtained. The resistant muffler structure is conducive to high-speed and high-frequency noise isolation, and the sound-absorbing material effectively absorbs the exhaust energy. The well-designed expansion cavity uses the sudden increase in cross-sectional area to disrupt the airflow and offset the sound wave energy, making the noise reduction effect significant.

[0037] Reference Figures 1 to 4 As shown, the present invention provides an exhaust muffler for racing cars, including an exhaust system, a muffler system and an expansion system. The exhaust system runs through the entire muffler, and the axes of the three systems are in the same straight line. A valve 9 is placed at the end of the back pressure pipe. When the valve 9 is opened, the back pressure chamber does not work. At this time, the exhaust muffler is a completely straight-through muffler, which is suitable for exhaust conditions at high speeds. When the valve 9 is closed, the return structure of the muffler plays a major role in improving the low-speed torque performance.

[0038] Furthermore, the exhaust system includes a main exhaust pipe 7 and a back-pressure branch pipe 6. The back-pressure branch pipe 6 is installed on both sides of the main exhaust pipe 7 by nesting, and the walls of the main exhaust pipe 7 and the back-pressure branch pipe 6 are designed with a large number of holes in round, square or triangular shapes.

[0039] Furthermore, a circular, square or other shaped spoiler port 8 is designed in the middle of the main exhaust pipe 7 to increase the flow cross section, and a valve 9 is designed at the front of the main exhaust pipe 7 to control whether the airflow of the entire main exhaust pipe flows in a straight line.

[0040] Further, the muffler system comprises a first muffler chamber top cover 1, a first muffler chamber bottom plate 2, a second muffler chamber bottom plate 4, a second muffler chamber top cover 5 and an exhaust pipe housing 10. A card slot is provided in the exhaust pipe housing 10 to fix the relative positions of the first muffler chamber top cover 1, the first muffler chamber bottom plate 2, the second muffler chamber bottom plate 4 and the second muffler chamber top cover 5 to prevent shaking.

[0041] Furthermore, sound insulation cotton is interspersed between the first soundproofing chamber top cover 1, the first soundproofing chamber bottom plate 2, the second soundproofing chamber bottom plate 4, and the second soundproofing chamber top cover 5, and the sound insulation cotton, the four top covers, the bottom plate and the exhaust pipe shell 10 together constitute the first and second soundproofing chambers.

[0042] Furthermore, the expansion system includes two cavities, an expansion chamber 12 and an expansion chamber with a back pressure structure. The two cavities are closely arranged and separated by an expansion chamber partition 3 in the middle, and the expansion chamber partition has a large number of through holes, so that the gas flowing out from the spoiler end surface can pass through.

[0043] In summary, the present invention switches the muffler between two exhaust paths by controlling the valve. The two exhaust paths are a straight path and a back-pressure branch path, which improves the power performance of the racing car under various engine speeds, reduces the noise of the racing car, and improves the performance of the racing car. After installing the manufactured muffler, the noise of the racing car at idle speed shall not exceed 100 db, and at 11,000 revolutions per minute, the noise shall not exceed 106 db. A variable exhaust structure is designed inside the muffler to improve the power performance of the racing car under various engine speeds and improve the performance of the team in the competition. Make the exhaust system of the whole racing car more powerful at low engine speeds and smoother at high engine speeds.

[0044] The above are only the preferred embodiments of the present invention, and of course, the scope of rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. A racing car exhaust muffler, characterized in that, It includes an exhaust pipe shell, a main exhaust pipe and a back-pressure branch pipe, the exhaust pipe shell is sleeved outside the main exhaust pipe, a plurality of partitions are sequentially distributed in the exhaust pipe shell along the axial direction, the plurality of partitions divide the space between the exhaust pipe shell and the main exhaust pipe into a plurality of chambers in the axial direction, the plurality of chambers are respectively a first silencing chamber, an expansion chamber, a back-pressure chamber and a second silencing chamber, a plurality of through holes are arranged on the partition between the expansion chamber and the back-pressure chamber, a spoiler port and a back-pressure branch pipe are sequentially arranged on the main exhaust pipe, the spoiler port and the back-pressure branch pipe are respectively arranged in the expansion chamber and the back-pressure chamber, and a valve is arranged at the connection between the main exhaust pipe and the back-pressure branch pipe; A plurality of holes are distributed on the wall of the main exhaust pipe, and the plurality of holes on the main exhaust pipe are divided into a plurality of groups, which are respectively arranged in the first silencing chamber, the back pressure chamber and the second silencing chamber; There are also multiple holes arranged on the wall of the back pressure branch pipe; The back pressure branch pipe is arranged in parallel with the main exhaust pipe, and the holes on the back pressure branch pipe and the holes on the main exhaust pipe are arranged side by side and opposite to each other in the back pressure chamber; The valve is an electromagnetic valve; Initially, when the valve (9) is opened, the back pressure chamber does not work, and the exhaust muffler is a straight-through muffler. The exhaust gas flows in from the inlet end and flows out from the outlet end through the straight flow channel of the main exhaust pipe (7). At this time, the entire main exhaust pipe (7) is a straight-through structure, which is suitable for the exhaust working condition under high speed. When the valve (9) is closed, the return structure formed by the back pressure branch pipe (6) of the muffler plays a major role. A part of the airflow flows out from the turbulence port (8). The sudden increase in the cross-sectional area is used to disturb the airflow and offset the sound wave energy. After the gas enters the expansion chamber (12), it enters the expansion chamber with the back pressure structure through the small hole of the expansion chamber partition (3) from the expansion chamber (12), that is, enters the back pressure chamber. The other part of the gas flows out from the small hole on the wall of the main exhaust pipe (7). The two parts of the airflow flow in from the small hole on the wall of the back pressure branch pipe (6) together, and finally enter the tail of the main exhaust pipe through the back pressure branch pipe and flow out from the exhaust outlet end, thereby improving the output torque performance at low speed.

2. The racing exhaust muffler according to claim 1, characterized in that, The shape of the hole can be any one of circle, square and triangle.

3. The racing exhaust muffler according to claim 1, characterized in that, The first soundproofing chamber and the second soundproofing chamber are filled with sound insulation cotton.

4. The racing exhaust muffler according to claim 1, characterized in that, The inner wall of the exhaust pipe shell is provided with a clamping groove, and the partition is arranged on the exhaust pipe shell through the clamping groove.

5. The racing exhaust muffler according to claim 1, characterized in that, There are two back-pressure branch pipes, which are symmetrically arranged on both sides of the main exhaust pipe. The back-pressure branch pipes are connected to the main exhaust pipe through an elbow.

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