Automobile exhaust pipe with spiral flow guide structure

Abstract

The utility model discloses a kind of automobile exhaust pipes with spiral flow guide structure, it is related to automobile exhaust pipe technical field, including exhaust pipe body, the inner wall of exhaust pipe body is fixedly provided with spiral flow guide piece, and the air inlet end of exhaust pipe body is fixedly provided with noise reduction mechanism;The noise reduction mechanism includes muffler, the inner wall of muffler is fixedly connected with first sound baffle, second sound baffle, uniform distribution plate and air inlet shell, and the end of air inlet shell is rotatably connected with rotating shaft by bearing.The utility model can guide exhaust gas to flow stably along spiral path by setting spiral flow guide piece on the inner wall of exhaust pipe body, reduce airflow resistance and vortex interference, fundamentally avoid the airflow vortex and head-on phenomenon commonly seen in existing straight cylinder or simple bending exhaust pipe, can significantly reduce airflow resistance, reduce exhaust back pressure, when engine is in high load condition, a large amount of exhaust gas can be discharged quickly and smoothly, avoid the engine power loss caused by poor exhaust.

Description

Technical Field

[0001] This utility model relates to the field of automotive exhaust pipe technology, and in particular to an automotive exhaust pipe with a spiral flow guiding structure. Background Technology

[0002] In the automotive industry, the exhaust pipe, as a core component of the engine exhaust system, has the core function of venting exhaust gases produced by engine combustion and reducing exhaust noise and environmental pollutant emissions. However, current automotive exhaust pipes still suffer from several technical shortcomings in practical applications: First, in existing exhaust pipes, exhaust gases tend to form vortices and clash with the airflow as they flow within the pipe. When the engine is under high load, a large amount of exhaust gas rushes into the exhaust pipe instantly, and these vortices significantly increase airflow resistance. This leads to increased exhaust back pressure, directly affecting engine power output performance. Second, noise reduction is difficult to achieve. Existing exhaust pipes typically rely solely on simple built-in sound-absorbing cotton or baffles for noise reduction, which cannot effectively guide and buffer airflow, making it difficult to specifically reduce noise at different frequencies.

[0003] To address this, we designed a car exhaust pipe with a spiral flow guiding structure. Utility Model Content

[0004] This utility model discloses an automotive exhaust pipe with a spiral flow guiding structure, which aims to solve the technical problems of existing automotive exhaust pipes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A car exhaust pipe with a spiral guide structure includes an exhaust pipe body, wherein a spiral guide vane is fixedly provided on the inner wall of the exhaust pipe body, and a noise reduction mechanism is fixedly provided at the air intake end of the exhaust pipe body. The noise reduction mechanism includes a muffler. The inner wall of the muffler is fixedly connected to a first sound insulation plate, a second sound insulation plate, a uniform distribution plate, and an air intake shell. The end of the air intake shell is rotatably connected to a rotating shaft via a bearing. An air guide impeller is fixedly connected to the surface of the rotating shaft. A first sound-absorbing cylinder is fixedly connected between the first and second sound insulation plates. A second sound-absorbing cylinder is fixedly connected between the second sound insulation plate and the uniform distribution plate. The air outlet of the muffler is fixedly connected to the air inlet of the exhaust pipe body, and an air inlet mounting pipe is fixedly connected to the air inlet of the muffler.

[0006] In a preferred embodiment, the surface of the first sound-absorbing cylinder is provided with a plurality of first sound-absorbing holes, and the surface of the second sound-absorbing cylinder is provided with a plurality of second sound-absorbing holes. The first sound-absorbing holes and the second sound-absorbing holes are distributed in a honeycomb pattern on the surfaces of the first sound-absorbing cylinder and the second sound-absorbing cylinder.

[0007] In a preferred embodiment, the surface of the first sound insulation panel is provided with a plurality of first vent holes, which are evenly distributed in a circular array on the surface of the first sound insulation panel, and all the first vent holes are located inside the first sound-absorbing cylinder.

[0008] In a preferred embodiment, the surface of the second sound insulation panel is provided with a plurality of second vent holes, which are evenly distributed in a circular array on the surface of the second sound insulation panel, and the plurality of second vent holes are all located outside the second sound absorption cylinder.

[0009] In a preferred embodiment, the uniform distribution plate is located near the air outlet of the silencer, and the surface of the uniform distribution plate is provided with a plurality of uniformly distributed air holes, which are arranged in a circular array and located inside the second sound-absorbing cylinder.

[0010] In a preferred embodiment, the surface of the air inlet housing is provided with a plurality of air inlet holes, the air inlet end of the air guide impeller corresponds to the air inlet housing, and the air outlet end of the air guide impeller corresponds to the first sound insulation plate.

[0011] In a preferred embodiment, the spiral guide vanes are evenly distributed along the circumferential direction of the inner wall of the exhaust pipe body, and a number of reinforcing ribs are fixedly connected to the surface of the spiral guide vanes on the side opposite to the gas flow direction.

[0012] As can be seen from the above, the automobile exhaust pipe with a spiral flow guiding structure provided by this utility model has the following technical effects.

[0013] Firstly, the spiral guide vanes fixed to the inner wall of the exhaust pipe guide the exhaust gas to flow stably along a spiral path, reducing airflow resistance and vortex interference. This fundamentally avoids the airflow vortices and countercurrents commonly found in existing straight or simply curved exhaust pipes, significantly reducing airflow resistance and exhaust back pressure. When the engine is under high load, a large amount of exhaust gas can be discharged quickly and smoothly, avoiding engine power loss due to poor exhaust flow. The reinforcing ribs on the back of the spiral guide vanes enhance their structural strength, preventing deformation and breakage under long-term impact from high-temperature, high-pressure exhaust gas.

[0014] Secondly, by setting up a noise reduction mechanism, the first and second sound-absorbing cylinders can specifically absorb noise of different frequencies. The first and second sound insulation panels can guide the airflow through in an orderly manner. Combined with the buffering and uniform distribution of the airflow by the uniform distribution plate, the noise is initially reduced and the airflow is stabilized. The multi-cavity and staggered air passage structure inside the muffler allows the exhaust gas to undergo multiple reflections and expansions, further improving the sound insulation and noise reduction effect of the car exhaust. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the overall structure of an automobile exhaust pipe with a spiral flow guide structure proposed in this utility model.

[0016] Figure 2 This is a frontal cross-sectional view of an automobile exhaust pipe with a spiral flow guiding structure proposed in this utility model.

[0017] Figure 3 This is a front cross-sectional view of a muffler with a spiral flow guiding structure for an automobile exhaust pipe, as proposed in this utility model.

[0018] Figure 4 This is a schematic diagram of the back structure of the spiral guide plate of an automobile exhaust pipe with a spiral flow guiding structure proposed in this utility model.

[0019] In the attached diagram: 1. Exhaust pipe body; 2. Spiral guide vane; 3. Noise reduction mechanism; 4. Intake mounting pipe; 201. Reinforcing ribs; 301. Silencer; 302. First sound insulation panel; 303. Second sound insulation panel; 304. Distributed sound distribution panel; 305. Air inlet shell; 306. Rotating shaft; 307. Air guide impeller; 308. First sound absorption tube; 309. Second sound absorption tube; 310. First sound absorption hole; 311. Second sound absorption hole; 312. First vent hole; 313. Second vent hole; 314. Distributed air hole; 315. Air inlet. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1-4 A car exhaust pipe with a spiral guide structure includes an exhaust pipe body 1, which is a cylindrical tubular structure made of high-temperature and corrosion-resistant stainless steel. Spiral guide vanes 2 are uniformly fixed along the circumference on the inner wall of the exhaust pipe body 1.

[0022] By setting spiral guide vanes 2 evenly distributed along the circumference on the inner wall of the exhaust pipe body 1, the exhaust gas can be guided to flow stably along the spiral path, fundamentally avoiding the airflow vortex and countercurrent phenomena commonly found in existing straight-tube exhaust pipes, significantly reducing airflow resistance and exhaust back pressure.

[0023] On the side surface of the spiral guide vane 2 opposite to the gas flow direction, several reinforcing ribs 201 are fixedly connected. The reinforcing ribs 201 are distributed along the length of the spiral guide vane 2 and are perpendicularly connected to the spiral guide vane 2. This structural design can not only enhance the structural strength of the spiral guide vane 2 and prevent it from deforming or breaking under the long-term impact of high temperature and high pressure exhaust gas, but also further streamline the airflow, reduce airflow disturbance, and improve exhaust stability.

[0024] At the air intake end of the exhaust pipe body 1, a noise reduction mechanism 3 is fixedly connected by welding. The core component of the noise reduction mechanism 3 is a muffler 301. The inner diameter of the muffler 301 is consistent with the inner diameter of the exhaust pipe body 1, ensuring that exhaust gas can flow smoothly from the muffler 301 into the exhaust pipe body 1. An air intake mounting pipe 4 is fixedly connected to the air intake end of the muffler 301. One end of the air intake mounting pipe 4 is welded to the muffler 301, and the other end can be sealed to the exhaust manifold of the car engine through a flange to realize the function of exhaust gas introduction.

[0025] On the inner wall of the muffler 301, from the air inlet end to the air outlet end (i.e., from the end near the air inlet mounting pipe 4 to the end near the exhaust pipe body 1), the air inlet shell 305, the first sound insulation plate 302, the second sound insulation plate 303 and the uniform distribution plate 304 are fixedly connected in sequence. The four components are all tightly fitted to the inner wall of the muffler 301 and are parallel to each other, forming an independent noise reduction cavity.

[0026] The air intake shell 305 is located near the air intake end of the muffler 301. Several air intake holes 315 are evenly distributed on the arc-shaped surface of the air intake shell 305 to guide exhaust gas evenly into the interior of the muffler 301. At the center of the end of the air intake shell 305, a rotating shaft 306 is rotatably connected via a bearing. The rotating shaft 306 extends along the axis of the muffler 301, and a guide impeller 307 is fixedly connected to its surface. The air intake end of the guide impeller 307 corresponds to the air intake shell 305, and the air outlet end corresponds to the first sound insulation plate 302. When exhaust gas enters through the air intake holes 315, it drives the guide impeller 307 to rotate the rotating shaft 306, further guiding the airflow, preventing concentrated airflow impact, and reducing airflow noise.

[0027] The first sound insulation plate 302 is located between the air inlet shell 305 and the second sound insulation plate 303. Several first vent holes 312 are formed on its surface, evenly distributed in a circular array. A first sound-absorbing cylinder 308 is also fixedly connected between the first and second sound insulation plates 302 and 303. The first sound-absorbing cylinder 308 has a cylindrical structure, with both ends sealed to the first and second sound insulation plates 302 and 303 respectively. All the first vent holes 312 are located inside the first sound-absorbing cylinder 308, ensuring that all airflow from the guide impeller 307 enters the first sound-absorbing cylinder 308. Several first sound-absorbing holes 310 are formed on the surface of the first sound-absorbing cylinder 308, distributed in a honeycomb pattern, which can specifically absorb high-frequency noise in the airflow, achieving a preliminary noise reduction effect.

[0028] The second sound insulation plate 303 is located between the first sound insulation plate 302 and the uniform distribution plate 304. Several second vent holes 313 are opened on its surface. The several second vent holes 313 are evenly distributed in a circular array on the surface of the second sound insulation plate 303. A second sound-absorbing cylinder 309 is fixedly connected between the second sound insulation plate 303 and the uniform distribution plate 304. The second sound-absorbing cylinder 309 is also cylindrical. Its two ends are sealed to the second sound insulation plate 303 and the uniform distribution plate 304, respectively. The several second vent holes 313 are all located on the outside of the second sound-absorbing cylinder 309, so that the airflow after noise reduction by the first sound-absorbing cylinder 308 can enter the cavity between the second sound-absorbing cylinder 309 and the silencer 301 through the second vent holes 313. The surface of the second sound-absorbing cylinder 309 is provided with a number of second sound-absorbing holes 311. The second sound-absorbing holes 311 are also distributed in a honeycomb pattern, which can absorb low- and medium-frequency noise in the airflow. Together with the first sound-absorbing cylinder 308, they can achieve multi-level noise reduction and improve the overall noise reduction effect.

[0029] The uniform distribution plate 304 is located near the air outlet of the muffler 301. Several uniformly distributed air holes 314 are opened on its surface. The several uniformly distributed air holes 314 are arranged in a circular array and are located inside the second sound-absorbing tube 309. After the airflow is reduced by the second sound-absorbing tube 309, it can flow into the interior of the exhaust pipe body 1 evenly through the uniformly distributed air holes 314 to avoid airflow turbulence. At the same time, it further buffers the airflow pressure, weakens residual noise, and lays a stable foundation for the subsequent spiral guide plate 2 to guide the airflow.

[0030] Working principle: When the car engine starts, exhaust gas is discharged from the engine exhaust manifold and first enters the intake mounting pipe 4, then is guided into the muffler 301. When the exhaust gas enters through the intake hole 315 on the surface of the intake housing 305, it drives the guide impeller 307 to rotate the rotating shaft 306. Subsequently, guided by the guide impeller 307, the airflow enters the first sound-absorbing cylinder 308 through the first vent hole 312 on the surface of the first sound insulation plate 302. The first sound-absorbing hole 310 on the surface of the first sound-absorbing cylinder 308 absorbs high-frequency noise in the airflow, achieving initial noise reduction. After the airflow is reduced by the first sound-absorbing cylinder 308, it enters the cavity between the second sound-absorbing cylinder 309 and the silencer cylinder 301 through the second vent 313 on the surface of the second sound insulation plate 303. The second sound-absorbing hole 311 on the surface of the second sound-absorbing cylinder 309 absorbs the low- and mid-frequency noise in the airflow, completing the secondary noise reduction. Then the airflow flows evenly into the interior of the exhaust pipe body 1 through the evenly distributed air holes 314 on the surface of the evenly distributed plate 304.

[0031] Inside the exhaust pipe body 1, the airflow flows stably along the spiral path under the guidance of the spiral guide vane 2. The spiral guide vane 2 not only reduces airflow eddies and resistance and lowers exhaust back pressure, but the reinforcing ribs 201 on its back side also further streamline the airflow and weaken residual noise. Finally, the optimized and noise-reduced exhaust gas is smoothly discharged along the exhaust pipe body 1, completing the entire exhaust and noise reduction process.

[0032] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A car exhaust pipe with a spiral flow guiding structure, comprising an exhaust pipe body (1), characterized in that, The inner wall of the exhaust pipe body (1) is fixedly provided with a spiral guide vane (2), and the intake end of the exhaust pipe body (1) is fixedly provided with a noise reduction mechanism (3). The noise reduction mechanism (3) includes a muffler (301). The inner wall of the muffler (301) is fixedly connected to a first sound insulation plate (302), a second sound insulation plate (303), a uniform distribution plate (304), and an air inlet shell (305). The end of the air inlet shell (305) is rotatably connected to a rotating shaft (306) via a bearing. A guide impeller (307) is fixedly connected to the surface of the rotating shaft (306). A first sound-absorbing cylinder (308) is fixedly connected between the first sound insulation plate (302) and the second sound insulation plate (303). A second sound-absorbing cylinder (309) is fixedly connected between the second sound insulation plate (303) and the uniform distribution plate (304). The air outlet of the muffler (301) is fixedly connected to the air inlet of the exhaust pipe body (1), and the air inlet of the muffler (301) is fixedly connected to an air inlet mounting pipe (4).

2. The automotive exhaust pipe with a spiral flow guiding structure according to claim 1, characterized in that, The surface of the first sound-absorbing cylinder (308) is provided with a plurality of first sound-absorbing holes (310), and the surface of the second sound-absorbing cylinder (309) is provided with a plurality of second sound-absorbing holes (311). The first sound-absorbing holes (310) and the second sound-absorbing holes (311) are distributed in a honeycomb pattern on the surface of the first sound-absorbing cylinder (308) and the second sound-absorbing cylinder (309).

3. The automotive exhaust pipe with a spiral flow guiding structure according to claim 2, characterized in that, The surface of the first sound insulation plate (302) is provided with a plurality of first vent holes (312), which are evenly distributed in a circular array on the surface of the first sound insulation plate (302), and the plurality of first vent holes (312) are all located inside the first sound absorption cylinder (308).

4. A car exhaust pipe with a spiral flow guiding structure according to claim 3, characterized in that, The surface of the second sound insulation board (303) is provided with a number of second vent holes (313). The number of second vent holes (313) are evenly distributed in a circular array on the surface of the second sound insulation board (303), and the number of second vent holes (313) are all located outside the second sound absorption cylinder (309).

5. A car exhaust pipe with a spiral flow guiding structure according to claim 4, characterized in that, The uniform distribution plate (304) is close to the air outlet of the silencer (301), and the surface of the uniform distribution plate (304) is provided with a number of uniformly distributed air holes (314). The number of uniformly distributed air holes (314) are arranged in a circular array, and the uniformly distributed air holes (314) are located inside the second sound-absorbing cylinder (309).

6. A car exhaust pipe with a spiral flow guiding structure according to claim 5, characterized in that, The surface of the air inlet shell (305) is provided with a plurality of air inlet holes (315), the air inlet end of the air guide impeller (307) corresponds to the air inlet shell (305), and the air outlet end of the air guide impeller (307) corresponds to the first sound insulation plate (302).

7. A car exhaust pipe with a spiral flow guiding structure according to claim 1, characterized in that, The spiral guide vane (2) is evenly distributed along the inner circumferential direction of the exhaust pipe body (1), and a number of reinforcing ribs (201) are fixedly connected to the surface of the spiral guide vane (2) opposite to the gas flow direction.

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