CN104389667A - Car exhaust pipe device capable of reducing noise - Google Patents

Abstract

The invention discloses a car exhaust pipe device capable of reducing noise. The car exhaust pipe device capable of reducing noise comprises a barrel body, an upper joint, a lower joint, an entrance muffler, an exit muffler and thin-wall inner containers; the entrance muffler penetrates the inner part of the barrel body from the entrance of the upper joint; the exit muffler penetrates the inner part of the barrel body from the entrance of the lower joint; the thin-wall inner containers are staggered sequentially inside the barrel body; the thin-wall inner containers are connected with the barrel body respectively by virtue of baffles. The thin-wall inner containers are staggered inside the barrel body, and bulges are arranged on the inner wall of the barrel body, so that airflow movement is changed efficiently, and good noise reduction effect is realized; meanwhile, the muffler structures are arranged on the two ends, so that the noise reduction function is further enhanced; the thin-wall inner containers are made of a stainless steel material, so that the service life of the exhaust pipe can be prolonged.

Description

A noise-reducing automobile exhaust pipe device

technical field

The invention relates to a noise reduction automobile exhaust pipe device, which belongs to the technical field of automobile accessories. the

Background technique

The exhaust pipe of a car has always been one of the main sources of vehicle noise. The noise is generally produced by the instability of high-speed air flow. The flowing air flow has the characteristics of high temperature, high pressure, and high speed. The emitted noise has high intensity, wide spectrum and wide range, which seriously affects the health of drivers and passengers. and the production and life of residents. the

The authorized announcement number is CN 202673424 U, which discloses a noise-reducing automobile exhaust pipe, which is equipped with a thin-walled inner tank and a muffler to achieve a certain noise-reducing effect, but due to the number and position of the thin-walled inner tank It is not suitable, so that the exhaust pipe of the car does not achieve the best effect of noise reduction. It has become a research hotspot in the industry to provide an automobile exhaust device with a simple structure, a good noise reduction structure and a long service life. the

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an automobile exhaust device with simple structure, good noise reduction structure and long service life. the

The purpose of the present invention is achieved by the following technical solutions:

A noise-reducing automobile exhaust pipe device, comprising a cylinder body 9, an upper joint 3, a lower joint 14, an inlet muffler 1, an outlet muffler 16 and a hemispherical thin-walled liner, the inlet muffler 1 is imported by the upper joint 3 Penetrate into the cylinder 9, the outlet muffler 16 penetrates into the cylinder 9 from the entrance of the lower joint 14, and more than two thin-walled inner tanks are arranged in sequence in the cylinder 9, and the thin-walled inner tanks are fixed inside the cylinder 9 through a partition .

Above-mentioned thin-walled inner bag comprises first thin-walled inner bag 6, second thin-walled inner bag 10 and the 3rd thin-walled inner bag 11, and described dividing plate comprises first dividing plate 5, second dividing plate 8 and the 3rd dividing plate plate 12. the

The aforementioned first thin-walled liner 6 , second thin-walled liner 10 and third thin-walled liner 11 have spherical convex surfaces in the radial direction of the cylinder 9 , and the spherical convex surfaces face the air intake direction. the

The distance between the second thin-walled liner 10 and the first thin-walled liner 6 is greater than the distance between the third thin-walled liner 11 and the second thin-walled liner 10 . the

The parts of the inlet muffler 1 and the outlet muffler 16 protruding into the cylinder body 9 are arranged with small muffler holes 4 distributed therein. the

Protrusions 7 are provided on the inner wall of the cylinder body 9 . the

The aforementioned thin-walled liner is made of stainless steel. the

Beneficial effects of the present invention:

Compared with the prior art, the present invention sets a plurality of thin-walled liners in the cylinder, which divides the exhaust pipe into a chamber structure with the partition, and effectively utilizes dividing a large space into a plurality of small spaces to reduce the gas velocity principle; the direction of the spherical convex surface of the thin-walled liner is the radial direction of the cylinder, and the spherical convex surface faces the direction of the air intake, so that the thin-walled liner can play the role of slow passage at low speed and fast passage at high speed; between the thin-walled liner The dislocation setting can make the gas in the exhaust pipe change direction repeatedly, and at the same time ensure that the gas can be exhausted smoothly at low or high speeds; the inner wall of the cylinder is provided with protrusions, which effectively changes the movement of the airflow. In summary, the above-mentioned structure makes the exhaust pipe have a good noise reduction function. At the same time, mufflers are installed at both ends to further enhance the noise reduction function. The thin-walled liner is made of stainless steel, which can prolong the service life of the exhaust pipe.

Description of drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a left side view of Fig. 1 along line E-E;

Explanation of reference signs:

1. Inlet muffler; 2. Inlet sound insulation layer; 3. Upper joint; 4. Small hole in muffler; 5. First partition; 6. First thin-walled liner; 7. Protrusion; 8. Second partition; 9 , cylinder; 10, the second thin-walled inner tank; 11, the third thin-walled inner tank; 12, the third partition; 13, the fourth chamber; 14, the lower joint; 15, the outlet sound insulation layer; 16, the outlet Muffler; 17, through hole.

Detailed ways:

Embodiment of the present invention: as shown in Fig. 1, Fig. 2, a kind of automobile exhaust pipe device of noise reduction, comprises cylinder body 9, upper joint 3, lower joint 14, inlet muffler 1 and outlet muffler 16, described inlet The muffler 1 penetrates into the cylinder 9 through the entrance of the upper joint 3, and the outlet muffler 16 penetrates into the cylinder 9 through the entrance of the lower joint 14. The part where the inlet muffler 1 and the outlet muffler 16 are installed in the cylinder 9 is provided with a muffler hole 4, A protrusion 7 is provided on the inner wall of the cylinder 9 .

The cylinder body 9 is provided with a first thin-walled inner container 6, a second thin-walled inner container 10, and a third thin-walled inner container 11 in sequence, passing through the first partition 5, the second partition 8, and the third partition respectively. The partition 12 is connected with the cylinder body 9 and divides the cylinder body 9 into four chambers A, B, C and D from front to back. the

The upper joint 3 and the lower joint 14 are detachable from the cylinder body 9 and can be connected by screw connection or locking mechanism. the

The gap between the inlet muffler 1 and the upper joint 3 is sealed with the inlet sound insulation layer 2 , and the gap between the outlet muffler 16 and the lower joint 14 is sealed with the outlet sound insulation layer 15 . the

The working principle of the present invention is: the hemispherical thin-walled liner has different ventilation volumes at different speeds. When the gas passes through at a low speed, the gas disperses slowly along the hemisphere; when the gas passes through at a high speed, the gas quickly collides with the top of the hemisphere and fails to pass The gas flows downward along the hemisphere. It can achieve the effect of slow pass at low speed and fast pass at high speed. the

The gas enters the chamber A of the noise reduction exhaust pipe from the inlet muffler 1, and the small hole 4 of the muffler is conducive to the friction of the sound wave in the pores of the porous material to be converted into heat energy and dissipated, so that the sound wave passing through the exhaust pipe is weakened, and the gas in the A chamber After a short period of existence in the chamber, the gas adjusts its direction and passes through the hemispherical first thin-walled liner 6 to reach the B chamber and divides into multiple small tributaries, which flow along the uneven inner wall of the cylinder 9, and a part of the sound energy is rubbed in the pores of the porous material. It is converted into heat energy and dissipated, which weakens the sound wave passing through the exhaust pipe, reduces the gas velocity again, and reduces noise. the

The second thin-walled inner tank 10 is misplaced with the first thin-walled inner tank 6, so that the airflow direction changes greatly, and the gas direction changes multiple times in the design structure, which can greatly reduce noise; the third thin-walled inner tank The liner 11 and the second thin-walled liner 10 have a relatively small misalignment, ensuring smooth exhaust at low and high speeds. the

The gas passes through the C chamber, reaches the D chamber, and finally discharges the exhaust gas through the outlet muffler 16. The outlet muffler 16 pipe wall is arranged and distributed with muffler aperture 4, helps to make the sound wave that passes through exhaust pipe weaken again, finally makes gas leave exhaust pipe with extremely small sound. the

This embodiment adopts three thin-walled inner tanks, which divide the entire exhaust pipe into four relatively small spaces, and at the same time make the gas have five large direction changes, which can ensure good noise reduction; two One or one thin-walled liner, the number of spaces formed is small and each space is large, the gas turns less, and the noise reduction effect cannot be guaranteed; although four or more thin-walled liners are used, the noise reduction effect is good. , but it increases the exhaust resistance, so it is not suitable to set. the

Claims (7)

1. A noise-reducing automobile exhaust pipe device, including a cylinder (9), an upper joint (3), a lower joint (14), an inlet muffler (1), an outlet muffler (16) and a hemispherical thin-walled inner The liner is characterized in that: the inlet muffler (1) is penetrated into the cylinder (9) through the inlet of the upper joint (3), and the outlet muffler (16) is penetrated into the cylinder (9) through the inlet of the lower joint (14), Two or more thin-walled liners are sequentially dislocated inside the cylinder body (9), and the thin-walled liners are fixed inside the cylinder body (9) through partitions. 2. A noise-reducing automobile exhaust pipe device according to claim 1, characterized in that: the thin-walled liner comprises a first thin-walled liner (6), a second thin-walled liner (10) and a third thin-walled liner (11), the partitions include a first partition (5), a second partition (8) and a third partition (12). 3. A noise-reducing automobile exhaust pipe device according to claim 2, characterized in that: the first thin-walled inner tank (6), the second thin-walled inner tank (10) and the third thin-walled inner tank The direction of the spherical convex surface of the wall liner (11) is the radial direction of the cylinder (9), and the spherical convex surface faces the air intake direction. 4. A noise-reducing automobile exhaust pipe device according to claim 2, characterized in that the distance between the second thin-walled inner tank (10) and the first thin-walled inner tank (6) is greater than the third The distance between the thin-walled liner (11) and the second thin-walled liner (10). 5. A noise-reducing automobile exhaust pipe device according to claim 1, characterized in that: the inlet muffler (1) and the outlet muffler (16) extend into the cylinder (9) and are arranged and distributed with mufflers small holes (4). 6. A noise reduction automobile exhaust pipe device according to claim 1, characterized in that: a protrusion (7) is provided on the inner wall of the cylinder (9). 7. A noise reduction automobile exhaust pipe device according to claim 1, characterized in that: said thin-walled liner is made of stainless steel.