CN211038778U - Multi-cavity resonance composite silencer - Google Patents

Abstract

The utility model relates to a multi-cavity resonance composite muffler, which comprises a muffler shell, an air inlet pipe and an air outlet pipe. The splicing line of an upper shell and a lower shell is located in the same plane, and the muffler shell is composed of a first mesh plate arranged in parallel. It is separated from the second mesh plate into a first chamber, a second chamber, and a third chamber, and the second chamber is filled with sound-absorbing material; the two ends of the muffler housing are respectively provided with an air inlet port and an air outlet port, and the air inlet pipe includes A rising pipe section extending obliquely upward and a straight pipe section extending horizontally, the downstream end of the intake pipe is higher than the plane where the splicing line is located, and the pipe sections of the intake pipe located in the first chamber and the second chamber are respectively provided with a number of through holes; The air outlet port is provided with the side wall of the third chamber, the pipe section of the air outlet pipe located in the second chamber is provided with a number of through holes, the two ends of the middle core pipe are respectively connected with the first chamber and the third chamber, and the middle core pipe is located in the second chamber. The pipe section of the chamber is provided with several through holes.

Description

Multi-cavity resonant composite muffler

technical field

The utility model relates to an automobile part, in particular to a multi-cavity resonance composite muffler.

Background technique

A car muffler is a special device that blocks sound transmission and allows airflow to pass through, preventing airflow dynamic noise. Improving the muffler effect of the muffler can reduce noise pollution, which is beneficial to physical and mental health. The existing automobile mufflers usually use the muffler pipe with a pipe section with a sudden change in cross-section to reduce the sound energy radiated by the muffler. The shells of common car mufflers are mostly regular cylinders. The muffler pipeline is connected with two chambers. After the high-temperature airflow enters the intake pipe, it enters the first chamber, and enters through the conduits of the first chamber and the second chamber. The second chamber is discharged from the muffler through the exhaust pipe to achieve the purpose of reducing noise. The automobile muffler with this structure has a single muffler principle, poor muffler effect, and unsatisfactory noise reduction effect. The flow in each chamber transmits the high temperature to the muffler shell, and the noise control effect is also very limited, and the shells of the existing automobile mufflers are mostly regular cylindrical, which need to occupy a large body space and have a low degree of adaptation to the body. , its smooth surface is not easy to fix.

SUMMARY OF THE INVENTION

The purpose of this utility model is to aim at the deficiencies of the prior art, and to provide a multi-cavity resonance composite muffler, which has a compact structure, is safe and reliable, can effectively reduce exhaust noise in all rotational speed ranges of the engine, and effectively reduces airflow noise and various orders. Noise, reduce exhaust back pressure, thereby reducing vehicle fuel consumption.

The purpose of this utility model is achieved as follows: a multi-cavity resonance composite muffler includes a muffler shell, an air intake pipe and an air outlet pipe, and the muffler shell is a sealed shell structure formed by combining an upper shell and a lower shell , the splicing line of the upper shell and the lower shell is located in the same plane, and the muffler shell is divided into a first chamber, a second chamber, The third chamber, the second chamber is filled with sound absorbing material; the two ends of the muffler housing are respectively provided with an air inlet port and an air outlet port, the air inlet port is arranged on the side wall of the first chamber, the inlet port is The air pipe is inserted from the air inlet port and passes through the first mesh plate and the second mesh plate, the air intake pipe includes a rising pipe section extending obliquely upward and a straight pipe section extending horizontally, the straight pipe section is located downstream of the rising pipe section The rising pipe section and the straight pipe section are connected by a smooth transition through the bending pipe section. The rising pipe section is located in the first chamber, the straight pipe section runs through the second chamber, and the downstream end of the intake pipe is connected to the third chamber. The downstream end of the air inlet pipe is higher than the plane where the splicing line is located, the pipe sections of the air inlet pipe located in the first chamber and the second chamber are respectively provided with a number of through holes; the air outlet port is provided with a third chamber side wall, the air outlet pipe is inserted from the air outlet port and transversely passes through the first mesh plate and the second mesh plate, the upstream end of the air outlet pipe is communicated with the first chamber, and the air outlet pipe is located in the second chamber The pipe section is provided with a number of through holes; it also includes an intermediate core pipe, the air outlet pipe is arranged in the area between the intake pipe and the intermediate core pipe, the intermediate core pipe transversely passes through the first mesh plate and the second mesh plate The two ends of the intermediate core tube are respectively communicated with the first chamber and the third chamber, and the pipe section of the intermediate core tube located in the second chamber is provided with a plurality of through holes.

The straight pipe section, the air outlet pipe and the middle core pipe of the air inlet pipe are respectively perpendicular to the first mesh plate.

The upstream end of the air outlet pipe is provided with a tapered hole segment, and the large diameter end of the tapered hole segment is located at the upstream segment of the small diameter end.

The through holes provided on the straight pipe section, the air outlet pipe and the middle core pipe of the air intake pipe are arranged staggered from each other.

The inner wall of the muffler housing is provided with a plurality of inwardly protruding ribs, and the extending direction of the ribs is perpendicular to the extending direction of the air outlet pipe.

The outer edges of the upper casing and the lower casing are provided with welding flanges, and the upper casing and the lower casing are seamed and welded to form a sealed casing through the welding flanges.

The first mesh plate and the second mesh plate are provided with flanging holes as installation holes for the air inlet pipe, the air outlet pipe or the intermediate core pipe to pass through.

The apertures of the mesh holes arranged on the first mesh plate and the second mesh plate are 3-4 mm, and the spacing between the mesh holes is greater than 4 mm.

The diameter of the air inlet pipe is equal to that of the air outlet pipe, and the diameter of the intermediate core pipe is smaller than that of the air outlet pipe.

The sound-absorbing material is glass fiber cotton.

With the above scheme, after the air flow and sound wave pass through the air inlet pipe, one or a small part enters the first chamber. The air flow is effectively attenuated due to the friction with the pipe with through holes and the mesh plate, and then enters the air outlet pipe and is discharged. 2. The other part enters the second chamber through the air intake pipe, and the sound wave is hindered and rubbed by the sound-absorbing material in the second chamber and disturbed by the middle core pipe, and the sound wave energy is greatly consumed. At the same time, the sound-absorbing material can also It plays the role of heat insulation to prevent the surface of the upper shell and the lower shell from overheating. This part of the air flow is split in the second chamber at the same time, and most of the air flow returns to the first chamber through the first mesh plate, and the energy of the sound wave Continue to be consumed by the mesh plate, and then enter the air outlet pipe to be discharged; 3. Most of the air flow flows into the third chamber through the air intake pipe, and then returns to the second chamber for energy consumption through the air pressure pressure, and then returns to the first chamber. Into the trachea discharge. The plurality of through holes form a resonance sound-absorbing structure. When the high-temperature airflow passes through, the air column in the resonance sound-absorbing structure vibrates, and the frictional damping during vibration converts a part of the sound energy into heat energy and dissipates it; During the process of pipes with through holes, mesh plates and sound-absorbing materials, the energy is gradually attenuated, which improves the high-frequency sound-absorbing ability. Control, the utilization of the internal space of the muffler is mentioned, so that the overall muffler capacity of the muffler is increased, so that the exhaust noise can be effectively suppressed. The muffler shell is a sealed shell structure formed by splicing an upper shell and a lower shell. The shell can aggravate the disturbance of the airflow in the shell, which is conducive to noise reduction and noise reduction, and can provide space and space for the spatial arrangement of the vehicle. convenient. The utility model is compact in structure, reasonable in design, moderate in cost, safe and reliable, and can effectively reduce exhaust noise in all rotational speed ranges of the engine, effectively reduce airflow noise and various order noises, and reduce exhaust back pressure, thereby reducing vehicle fuel consumption.

The inner wall of the muffler shell is provided with a number of inwardly protruding ribs, the extension direction of the ribs is perpendicular to the extension direction of the air outlet pipe, and the installation of the ribs can increase the friction between the airflow, the sound wave and the shell, and the sound wave can be obtained. Effective attenuation, but also can increase the strength and stiffness of the shell.

The outer edges of the upper casing and the lower casing are provided with welding flanges, and the upper casing and the lower casing are welded into a sealed casing through the welding flange and roll welding. With this welding structure, the welded casings are sealed. Strong, high weld strength.

The sound-absorbing material is glass fiber cotton, which has good sound-absorbing effect, strong heat resistance, good corrosion resistance and high mechanical strength. The utility model has a compact, safe and reliable structure, and can effectively reduce exhaust noise in all engine speed ranges, effectively reduce airflow noise and various order noises, and reduce exhaust back pressure, thereby reducing vehicle fuel consumption.

The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is A-A sectional view in Fig. 1;

Fig. 3 is the structural representation of the intake pipe;

Figure 4 is a schematic diagram of the installation structure of the intake pipe;

Fig. 5 is the structural representation of entering the first mesh plate;

FIG. 6 is a schematic diagram of the flow of airflow in the muffler housing.

In the drawings, 1 is the lower casing, 2 is the upper casing, 3 is the air inlet pipe, 4 is the air outlet pipe, 5 is the middle core pipe, 6 is the first mesh plate, 8 is the second mesh plate, 31 is the Rising pipe section, 32 is a bent pipe section, 33 is a straight pipe section, 41 is a tapered hole section, a is the first chamber, a1 is the intake port, b is the second chamber, c is the third chamber, c1 is the outlet port, d is the rib, e is the welding flange, f is the flange hole, and g is the sound-absorbing material.

Detailed ways

Referring to the accompanying drawings, specific embodiments of the present invention will be described in detail.

Referring to Figures 1 to 6, an embodiment of a multi-cavity resonance composite muffler, the multi-cavity resonance composite muffler includes a muffler housing, an air intake pipe 3 and an air outlet pipe 4, and the muffler housing consists of an upper casing 2 and a lower casing. The sealed shell structure formed by assembling the body 1. The outer edges of the upper casing and the lower casing 1 can be provided with welding flanges e, and the upper casing and the lower casing 1 are welded into sealed casings by welding flanges and seam welding. The shell has strong sealing and high weld strength. Preferably, a number of inwardly protruding ribs d are arranged on the inner wall of the muffler shell, and the extending direction of the ribs d is perpendicular to the extending direction of the air outlet pipe 4. The setting of the ribs d can increase the airflow, sound wave The friction with the shell can effectively attenuate the sound wave, and at the same time, it can also increase the strength and rigidity of the shell. The splicing line of the upper casing 2 and the lower casing 1 is located in the same plane, and the muffler casing is divided into a first chamber a, a second The second chamber b and the third chamber c; the cross section of the first chamber is a trapezoid, and the upper bottom of the trapezoid is located on one side of the air inlet port, and this structure is used to guide and collect airflow. The apertures of the meshes provided on the first mesh plate 6 and the second mesh plate 8 are 3-4mm, and the spacing between the meshes is greater than 4mm, which can effectively reduce exhaust noise within the engine speed range. The second chamber b is filled with a sound-absorbing material g, and the sound-absorbing material g can be glass fiber cotton, which has good noise reduction effect, strong heat resistance, good corrosion resistance and high mechanical strength. Two ends of the muffler housing are respectively provided with an air inlet port a1 and an air outlet port, the air inlet port a1 is arranged on the side wall of the first chamber a, and the air inlet pipe 3 is inserted from the air inlet port a1 and passes through the first chamber a1. The mesh plate 6 and the second mesh plate 8, the first mesh plate 6 and the second mesh plate 8 are provided with flanging holes f as the installation holes for the air intake pipe 3 to pass through, and the flanging holes can increase the The support strength can also facilitate the welding and fixing of thin-walled parts such as mesh plates. The intake pipe 3 includes a rising pipe section 31 extending obliquely upward and a straight pipe section 33 extending horizontally, the straight pipe section 33 is located in the downstream section of the rising pipe section 31, and the rising pipe section 31 and the straight pipe section 33 pass through the bending pipe section. 32 Smooth transition connection, the rising pipe section 31 is located in the first chamber a, the rising pipe section 31 buffers and guides the airflow, the straight pipe section 33 runs through the second chamber b, and the straight pipe section 33 of the intake pipe 3 It is perpendicular to the first mesh plate 6 . The downstream end of the air intake pipe 3 is communicated with the third chamber c, and the orifice of the downstream end of the air intake pipe 3 is higher than the plane where the splicing line is located. The pipe sections of the air intake pipe 3 located in the first chamber a and the second chamber b are respectively provided with a plurality of through holes.

The air outlet port c1 is provided with the side wall of the third chamber c, the air outlet pipe 4 is inserted from the air outlet port c1 and transversely passes through the first mesh plate 6 and the second mesh plate 8, and the air outlet pipe 4 is connected to the first mesh plate 6 and the second mesh plate 8. The mesh plate 6 is vertical; the cross-section of the third chamber is a trapezoid, and the upper bottom of the trapezoid is located on one side of the gas outlet. The first mesh plate 6 and the second mesh plate 8 are provided with flanging holes f as installation holes through which the air outlet pipe 4 passes. The upstream end of the air outlet pipe 4 is communicated with the first chamber a. The upstream end of the air outlet pipe 4 is provided with a conical hole section 41, and the large diameter end of the conical hole section 41 is located in the upstream section of the small diameter end, which is beneficial to The air flow can reduce the exhaust back pressure and can effectively attenuate the sound wave. The pipe section of the air outlet pipe 4 located in the second chamber b is provided with a number of through holes.

The multi-cavity resonance composite muffler also includes an intermediate core pipe 5, the air outlet pipe 4 is arranged in the area between the intake pipe 3 and the intermediate core pipe 5, and the intermediate core pipe 5 transversely passes through the first mesh plate 6 and the second mesh plate 6. The mesh plate 8, the middle core tube 5 is perpendicular to the first mesh plate 6. The first mesh plate 6 and the second mesh plate 8 are provided with flanging holes f as installation holes for the intermediate core tube 5 to pass through. Preferably, the diameter of the air inlet pipe 3 is equal to that of the air outlet pipe 4, and the diameter of the intermediate core pipe 5 is smaller than the diameter of the air outlet pipe 4. With this structure, the airflow can be effectively divided, and at the same time It can reduce the exhaust back pressure, thereby reducing the fuel consumption of the whole vehicle. The two ends of the middle core tube 5 are respectively communicated with the first chamber a and the third chamber c, and the pipe section of the middle core tube 5 located in the second chamber b is provided with a plurality of through holes. The straight pipe section of the air inlet pipe, the air outlet pipe, and the through holes on the middle core pipe are arranged staggered from each other. This structure can make the air flow diffuse and disturb sufficiently, and the sound-absorbing material can be used to the greatest extent for noise reduction.

When the above-mentioned scheme is used for exhaust silencing, after the air flow and sound wave pass through the intake pipe 3, one or a small part enters the first chamber a, and the sound wave is effectively obtained due to the friction between the air flow and the through-hole pipe and the mesh plate. 2. The other part enters the second chamber b through the air inlet pipe 3, and the sound wave is hindered and rubbed by the sound absorbing material g in the second chamber b and disturbed by the middle core pipe 5, The sound wave energy is greatly consumed, and at the same time, the sound absorbing material g can also play a role of heat insulation to prevent the surfaces of the upper casing 2 and the lower casing 1 from being overheated. This part of the air flow is divided at the same time in the second chamber b, and most of the air flow returns to the first chamber a through the first mesh plate, and the energy of the sound wave continues to be consumed by the mesh plate, and then enters the air outlet pipe 4 for discharge; three , Most of the airflow flows into the third chamber c through the air intake pipe 3, and then returns to the second chamber b for energy consumption through the pressure of the airflow, and then returns to the first chamber a and enters the air outlet pipe 4 for discharge. The utility model is compact in structure, reasonable in design, moderate in cost, safe and reliable, and can effectively reduce exhaust noise in all rotational speed ranges of the engine, effectively reduce airflow noise and various order noises, and reduce exhaust back pressure, thereby reducing vehicle fuel consumption.

Claims (10)

1. A multi-cavity resonance composite muffler, comprising a muffler housing, an air inlet pipe (3) and an air outlet pipe (4), characterized in that: the muffler housing is composed of an upper housing (2) and a lower housing (1) A sealed shell structure formed by splicing, the splicing lines of the upper shell (2) and the lower shell (1) are located in the same plane, and the muffler shell is composed of a first mesh plate (6) arranged in parallel and a The second mesh plate (8) is divided into a first chamber (a), a second chamber (b) and a third chamber (c), and the second chamber (b) is filled with a sound absorbing material (g) ); the two ends of the muffler housing are respectively provided with an air inlet port (a1) and an air outlet port (c1), the air inlet port (a1) is arranged on the side wall of the first chamber (a), and the air outlet port ( c1) Set the side wall of the third chamber (c), the air inlet pipe (3) is inserted from the air inlet port (a1) and passes through the first mesh plate (6) and the second mesh plate (8), so The intake pipe (3) comprises a rising pipe section (31) extending obliquely upward and a straight pipe section (33) extending horizontally, the straight pipe section (33) being located at the downstream section of the rising pipe section (31), the rising pipe section ( 31) Located in the first chamber (a), the straight pipe section (33) runs through the second chamber (b), the downstream end of the air inlet pipe (3) is communicated with the third chamber (c), the The nozzle of the downstream end of the air inlet pipe (3) is higher than the plane where the splicing line is located, and the pipe sections of the air inlet pipe (3) located in the first chamber (a) and the second chamber (b) are respectively provided with a plurality of through holes; The air outlet pipe (4) is inserted from the air outlet port (c1) and transversely passes through the first mesh plate (6) and the second mesh plate (8), and the upstream end of the air outlet pipe (4) is connected to the first cavity The chamber (a) is connected, and the pipe section of the air outlet pipe (4) located in the second chamber (b) is provided with a number of through holes; it also includes an intermediate core pipe (5), and the air outlet pipe (4) is arranged in the inlet The area between the gas pipe (3) and the intermediate core pipe (5), the intermediate core pipe (5) transversely passes through the first mesh plate (6) and the second mesh plate (8), the intermediate core pipe ( Both ends of 5) are respectively communicated with the first chamber (a) and the third chamber (c), and the pipe section of the middle core tube (5) located in the second chamber (b) is provided with several through holes. 2. The multi-cavity resonance composite muffler according to claim 1, characterized in that: the straight pipe section (33), the air outlet pipe (4), and the middle core pipe (5) of the air inlet pipe (3) are respectively the same as the first The mesh plate (6) is vertical. 3. The multi-cavity resonance composite muffler according to claim 1, characterized in that: the upstream end of the air outlet pipe (4) is provided with a tapered hole segment (41), and the large diameter of the tapered hole segment (41) The end is upstream of the trailing end. 4 . The multi-cavity resonance composite muffler according to claim 1 , wherein the straight pipe section ( 33 ), the air outlet pipe ( 4 ) and the intermediate core pipe ( 5 ) of the air inlet pipe ( 3 ) are provided with through holes. 5 . staggered settings from each other. 5. The multi-cavity resonance composite muffler according to claim 1, wherein a plurality of inwardly protruding ribs (d) are arranged on the inner wall of the muffler shell, and the extending direction of the ribs (d) It is perpendicular to the extension direction of the air outlet pipe (4). 6. The multi-cavity resonance composite muffler according to claim 1, characterized in that: the outer edges of the upper shell and the lower shell (1) are provided with welding flanges (e), and the upper shell, the lower shell (1) are provided with welding flanges (e). The casing (1) is welded into a sealed casing by welding flanging and seam welding. 7. The multi-cavity resonance composite muffler according to claim 1, characterized in that: the first mesh plate (6) and the second mesh plate (8) are provided with flanging holes (f) as air supply pipes (3), the installation hole through which the air outlet pipe (4) or the intermediate core pipe (5) passes. 8. The multi-cavity resonance composite muffler according to claim 1, characterized in that: the apertures of the meshes provided on the first mesh plate (6) and the second mesh plate (8) are 3-4mm, The spacing between the mesh holes is greater than 4mm. 9. The multi-cavity resonance composite muffler according to claim 1, characterized in that: the pipe diameter of the air inlet pipe (3) is equal to the pipe diameter of the air outlet pipe (4), and the diameter of the intermediate core pipe (5) is equal to that of the air outlet pipe (4). The pipe diameter is smaller than the pipe diameter of the air outlet pipe (4). 10 . The multi-cavity resonance composite muffler according to claim 1 , wherein the sound-absorbing material (g) is glass fiber cotton. 11 .

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