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, wherein the splicing lines of an upper shell and a lower shell are positioned in the same plane, the muffler shell is divided into a first cavity, a second cavity and a third cavity by a first mesh plate and a second mesh plate which are arranged in parallel, and the second cavity is filled with a sound absorbing material; the two ends of the silencer shell are respectively provided with an air inlet port and an air outlet port, the air inlet pipe comprises an ascending pipe section extending obliquely upwards and a straight pipe section extending horizontally, the pipe orifice of the downstream end of the air inlet pipe is higher than the plane of the splicing line, and the pipe sections of the air inlet pipe, which are positioned in the first cavity and the second cavity, are respectively provided with a plurality of through holes; the outlet port is provided with a side wall of the third cavity, the pipe section of the outlet pipe positioned in the second cavity is provided with a plurality of through holes, two ends of the middle core pipe are respectively communicated with the first cavity and the third cavity, and the pipe section of the middle core pipe positioned in the second cavity is provided with a plurality of through holes.

Description

Multi-cavity resonance composite silencer

Technical Field

The utility model relates to an automobile parts, concretely relates to multicavity resonance composite muffler.

Background

The automobile silencer is a special device for preventing and controlling airflow dynamic noise, which obstructs sound transmission and allows airflow to pass through. The silencer has the advantages that the silencing effect is improved, the noise pollution can be reduced, the physical and psychological health is facilitated, and the existing automobile silencer generally adopts a silencer pipeline which is connected with a pipe section with an abrupt change in section to reduce sound energy radiated outwards by the silencer. Common automobile muffler's casing is mostly the tube-shape of rule, two cavities have been connect on the silencer pipeline, high temperature air current gets into behind the intake pipe, get into first cavity, the pipe through first cavity and second cavity gets into the second cavity, through the blast pipe discharge silencer again, reach the purpose of noise reduction, adopt the automobile muffler of this kind of structure, the noise elimination principle is single, the noise cancelling effect is relatively poor, the effect of making an uproar is unsatisfactory, and because high temperature air current flees in each cavity indoor flow and gives the silencer casing with high temperature conduction, noise control effect is also very limited simultaneously, and the casing of current automobile muffler is mostly the tube-shape of rule, it is low also with the degree of automobile body adaptation to need to occupy great automobile body space, its surface is smooth not convenient for fixing.

Disclosure of Invention

The utility model aims at prior art not enough, provide a multicavity resonance composite muffler, its compact structure, safe and reliable can subdue all rotational speed within range exhaust noise of engine effectively, effectively reduces air current noise and each order noise, reduces exhaust backpressure to reduce whole car oil consumption.

The purpose of the utility model is realized like this: a multi-cavity resonance composite muffler comprises a muffler shell, an air inlet pipe and an air outlet pipe, wherein the muffler shell is of a sealed shell structure formed by splicing an upper shell and a lower shell, splicing lines of the upper shell and the lower shell are positioned in the same plane, the muffler shell is divided into a first cavity, a second cavity and a third cavity by a first mesh plate and a second mesh plate which are arranged in parallel, and a sound absorption material is filled in the second cavity; the silencer comprises a silencer shell, an air inlet pipe, an air outlet pipe, an air inlet pipe, a bent pipe section, an ascending pipe section and a straight pipe section, wherein the silencer shell is provided with an air inlet port and an air outlet port, the air inlet port is arranged on the side wall of a first cavity, the air inlet pipe is inserted from the air inlet port and penetrates through a first mesh plate and a second mesh plate, the air inlet pipe comprises the ascending pipe section extending in an inclined upward direction and the straight pipe section extending in a horizontal direction, the straight pipe section is located at the downstream section of the ascending pipe section, the ascending pipe section and the straight pipe section are in smooth transition connection through the bent pipe section, the ascending pipe section is located in the first cavity, the straight pipe section penetrates through a second cavity, the downstream end of the air inlet pipe is communicated with a third cavity, the pipe orifice of; the air outlet port is provided with the side wall of the third cavity chamber, the air outlet pipe is inserted into the first mesh plate and the second mesh plate from the air outlet port and transversely penetrates through the first mesh plate and the second mesh plate, the upstream end of the air outlet pipe is communicated with the first cavity chamber, and a pipe section of the air outlet pipe, which is positioned in the second cavity chamber, is provided with a plurality of through holes; the gas outlet pipe is arranged in a region between the gas inlet pipe and the middle core pipe, the middle core pipe transversely penetrates through the first mesh plate and the second mesh plate, two ends of the middle core pipe are respectively communicated with the first cavity and the third cavity, and a pipe section of the middle core pipe, which is located in the second cavity, 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 outlet duct sets up the taper hole section, the big footpath end of taper hole section is located the upstream section of path end.

The straight pipe section of intake pipe, the through-hole that sets up on outlet duct, the middle core pipe staggers the setting each other.

The silencer shell is characterized in that a plurality of inward convex ribs are arranged on the inner wall of the silencer shell, and the extending direction of the convex ribs is perpendicular to the extending direction of the air outlet pipe.

The outer edges of the upper shell and the lower shell are respectively provided with a welding flange, and the upper shell and the lower shell are welded into a sealed shell through welding flanges and seam welding.

And the first mesh plate and the second mesh plate are provided with flanging holes which are used as mounting holes for the air inlet pipe, the air outlet pipe or the middle core pipe to pass through.

The aperture of the meshes arranged on the first mesh plate and the second mesh plate is 3-4mm, and the distance between the meshes is larger than 4 mm.

The pipe diameter of intake pipe and the pipe diameter of outlet duct are equidimension, the pipe diameter of middle core pipe is less than the pipe diameter of outlet duct.

The sound absorption material is glass fiber cotton.

By adopting the scheme, after the airflow and the sound waves pass through the air inlet pipe, one part and a small part of the airflow enter the first chamber, and the sound waves are effectively attenuated due to the friction between the airflow and the pipeline with the through holes and the mesh plate and then enter the air outlet pipe to be discharged; the other part of the air flow enters a second cavity through an air inlet pipe, the sound wave is blocked and rubbed by a sound absorption material and disturbed by a middle core pipe in the second cavity, the energy of the sound wave is greatly consumed, meanwhile, the sound absorption material can also play a heat insulation role, the surfaces of the upper shell and the lower shell are prevented from being overheated, the part of the air flow is simultaneously split in the second cavity, most of the air flow returns to the first cavity through a first mesh plate, the energy of the sound wave is continuously consumed by the mesh plate and then enters an air outlet pipe to be discharged; and thirdly, most of air flow flows into the third chamber through the air inlet pipe, then returns to the second chamber again for energy consumption through the air flow pressure, and then returns to the first chamber to enter the air outlet pipe for discharge. The through holes form a resonance sound absorption structure, when high-temperature air flows through the resonance sound absorption structure, the air column in the resonance sound absorption structure vibrates, and friction damping during vibration converts part of sound energy into heat energy to dissipate the heat energy; the sound wave is repeatedly passed through the pipeline with through holes, the mesh plate and the sound absorption material, the energy is attenuated step by step, the high-frequency noise elimination capability is improved, the control of the middle and low-frequency noise is enhanced through the action of the first chamber and the third chamber, and the utilization of the internal space of the silencer is improved, so that the total noise elimination capability of the silencer is increased, and the exhaust noise is effectively inhibited. The silencer casing is by last casing and the sealed shell structure that the casing amalgamation formed down, and the disturbance of air current in this casing can aggravate the casing is favorable to carrying out the amortization and falls the noise, can provide space and facility for the spatial arrangement of whole car simultaneously. The utility model has the advantages of compact structure and reasonable design, moderate, the safe and reliable of cost can subdue the exhaust noise in all rotational speed ranges of engine effectively, effectively reduces air current noise and each order noise, reduces exhaust backpressure to reduce whole car oil consumption.

The silencer shell is characterized in that a plurality of inward convex ribs are arranged on the inner wall of the silencer shell, the extending direction of each convex rib is perpendicular to the extending direction of the corresponding air outlet pipe, friction between air flow and sound wave and the shell can be increased by arranging the convex ribs, the sound wave is effectively attenuated, and meanwhile, the strength and the rigidity of the shell can also be increased.

The welding structure is adopted, the welded shell is strong in sealing, and the strength of a welding seam is high.

The sound absorption material is made of glass fiber cotton, the glass fiber cotton has a good noise reduction effect, and the sound absorption material is strong in heat resistance, good in corrosion resistance and high in mechanical strength. Adopt above-mentioned utility model, its compact structure, safe and reliable can subdue the exhaust noise in all rotational speed ranges of engine effectively, effectively reduces air current noise and each order noise, reduces exhaust backpressure to reduce whole car oil consumption.

The invention will be further explained with reference to the drawings and the specific embodiments.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic structural view of an intake pipe;

FIG. 4 is a schematic view of an installation structure of an intake duct;

FIG. 5 is a schematic view of the structure of the first mesh plate;

fig. 6 is a schematic flow diagram of the gas flow within the muffler shell.

In the attached drawing, 1 is a lower shell, 2 is an upper shell, 3 is an air inlet pipe, 4 is an air outlet pipe, 5 is a middle core pipe, 6 is a first mesh plate, 8 is a second mesh plate, 31 is an ascending pipe section, 32 is a bending pipe section, 33 is a straight pipe section, 41 is a conical hole section, a is a first cavity, a1 is an air inlet port, b is a second cavity, c is a third cavity, c1 is an air outlet port, d is a convex rib, e is a welding flanging, f is a flanging hole, and g is a sound absorption material.

Detailed Description

Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 to 6, an embodiment of a multi-cavity resonance composite muffler includes a muffler shell, an air inlet pipe 3 and an air outlet pipe 4, wherein the muffler shell is a sealed shell structure formed by splicing an upper shell 2 and a lower shell 1. The welding structure is adopted, the welded shell is strong in sealing, and the welding seam strength is high. Preferably, set up a plurality of inside bellied protruding muscle d on the silencer shells inner wall, the extending direction of protruding muscle d is perpendicular with the extending direction of outlet duct 4, sets up protruding muscle d and can make the friction of increase air current, sound wave and casing, and the sound wave obtains effectual decay, also can increase the intensity and the rigidity of casing simultaneously. The splicing lines of the upper shell 2 and the lower shell 1 are positioned in the same plane, and the silencer shell is divided into a first chamber a, a second chamber b and a third chamber c by a first mesh plate 6 and a second mesh plate 8 which are arranged in parallel; the cross section of the first chamber is trapezoidal, the upper bottom of the trapezoid is positioned on one side of the air inlet, and the structure is used for guiding and collecting air flow. The apertures of the meshes arranged on the first mesh plate 6 and the second mesh plate 8 are 3-4mm, and the distance between the meshes is larger than 4mm, so that the exhaust noise in the rotating speed range of the engine can be effectively reduced. The sound absorption material g is filled in the second chamber b, and can be made of glass fiber cotton, so that the sound absorption effect of the glass fiber cotton is good, and the sound absorption material is strong in heat resistance, good in corrosion resistance and high in mechanical strength. The both ends of silencer casing set up inlet port a1, the port of giving vent to anger respectively, inlet port a1 sets up at first cavity a lateral wall, inlet pipe 3 inserts and passes first mesh board 6 and second mesh board 8 from inlet port a1, set up the mounting hole that flanging hole f passed as supplying inlet pipe 3 on first mesh board 6, the second mesh board 8, set up the welded fastening that the thin wall part of mesh board this kind also can be convenient for of support intensity can be increased to the flanging hole. The air inlet pipe 3 comprises an ascending pipe section 31 extending obliquely upwards and a straight pipe section 33 extending horizontally, the straight pipe section 33 is located at the downstream section of the ascending pipe section 31, the ascending pipe section 31 and the straight pipe section 33 are connected in a smooth transition mode through a bent pipe section 32, the ascending pipe section 31 is located in the first cavity a, the ascending pipe section 31 buffers and guides air flow, the straight pipe section 33 penetrates through the second cavity b, and the straight pipe section 33 of the air inlet pipe 3 is perpendicular to the first mesh plate 6. The downstream end of the air inlet pipe 3 is communicated with the third chamber c, and a pipe orifice of the downstream end of the air inlet pipe 3 is higher than the plane of the splicing line. 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 port c1 is arranged on the side wall of the third chamber c, the air outlet pipe 4 is inserted from the air outlet port c1 and transversely penetrates through the first mesh plate 6 and the second mesh plate 8, and the air outlet pipe 4 is perpendicular to the first mesh plate 6; the cross section of the third chamber is trapezoidal, and the upper bottom of the trapezoid is positioned on one side of the air outlet port. And the first mesh plate 6 and the second mesh plate 8 are provided with flanging holes f as mounting holes for the air outlet pipe 4 to pass through. The upstream end of outlet duct 4 communicates with first cavity a, the upstream end of outlet duct 4 sets up taper hole section 41, the big footpath end of taper hole section 41 is located the upstream section of path end, is favorable to the air current to flow, reduces exhaust backpressure, also enables the sound wave to obtain effectual decay, the pipeline section that outlet duct 4 is located second cavity b is provided with a plurality of through-holes.

The multi-cavity resonance composite muffler further comprises an intermediate core pipe 5, the gas outlet pipe 4 is arranged in the area between the gas inlet pipe 3 and the intermediate core pipe 5, the intermediate core pipe 5 transversely penetrates through the first mesh plate 6 and the second mesh plate 8, and the intermediate core pipe 5 is perpendicular to the first mesh plate 6. And the first mesh plate 6 and the second mesh plate 8 are provided with flanging holes f which are used as mounting holes for the middle core pipe 5 to pass through. Preferably, the pipe diameter of intake pipe 3 is the same with the pipe diameter of outlet duct 4, the pipe diameter of middle core pipe 5 is less than the pipe diameter of outlet duct 4, adopts this to have the structure can effectively shunt the air current, can reduce exhaust backpressure simultaneously to reduce whole car oil consumption. The two ends of the middle core tube 5 are respectively communicated with the first cavity a and the third cavity c, and a plurality of through holes are formed in the tube section, located in the second cavity b, of the middle core tube 5. The through-holes that set up on the straight tube section of intake pipe, outlet duct, the middle core pipe stagger the setting each other, adopt this kind of structure can make air current diffusion, disturbance abundant, can also utilize sound absorbing material to carry out the amortization to the at utmost.

When the scheme is adopted for exhaust and noise elimination, after the air flow and the sound wave pass through the air inlet pipe 3, one part or a small part of the air flow and the sound wave enter the first chamber a, the sound wave is effectively attenuated due to the friction of the air flow and the pipeline with the through holes and the mesh plate, and then the air flow enters the air outlet pipe 4 to be exhausted; two, another part gets into second cavity b through intake pipe 3, and the sound wave receives the hindrance and the friction of sound absorbing material g and the vortex of middle core pipe 5 at second cavity b, and sound wave energy is consumed by a wide margin, and sound absorbing material g just can also play thermal-insulated effect simultaneously, prevents that upper housing 2, lower casing 1 surface from overheating. The part of the airflow is simultaneously split in the second chamber b, most of the airflow returns to the first chamber a through the first mesh plate, and the energy of the sound wave is continuously consumed by the mesh plate and then enters the air outlet pipe 4 to be discharged; thirdly, most of the air flow flows into the third chamber c through the air inlet pipe 3, then returns to the second chamber b again for energy consumption through the pressure of the air flow, and then returns to the first chamber a to enter the air outlet pipe 4 for discharge. The utility model has the advantages of compact structure and reasonable design, moderate, the safe and reliable of cost can subdue the exhaust noise in all rotational speed ranges of engine effectively, effectively reduces air current noise and each order noise, reduces exhaust backpressure to reduce whole car oil consumption.

Claims (10)

1. The utility model provides a multicavity resonance composite muffler, includes muffler casing, intake pipe (3) and outlet duct (4), its characterized in that: the silencer shell is of a sealed shell structure formed by splicing an upper shell (2) and a lower shell (1), splicing lines of the upper shell (2) and the lower shell (1) are located in the same plane, the silencer shell is divided into a first chamber (a), a second chamber (b) and a third chamber (c) by a first mesh plate (6) and a second mesh plate (8) which are arranged in parallel, and a sound absorption material (g) is filled in the second chamber (b); the muffler shell is characterized in that an air inlet port (a1) and an air outlet port (c1) are respectively arranged at two ends of the muffler shell, the air inlet port (a1) is arranged on the side wall of a first cavity (a), the air outlet port (c1) is arranged on the side wall of a third cavity (c), the air inlet pipe (3) is inserted into and penetrates through a first mesh plate (6) and a second mesh plate (8) from the air inlet port (a1), the air inlet pipe (3) comprises an ascending pipe section (31) extending obliquely upwards and a horizontally extending straight pipe section (33), the straight pipe section (33) is located at the downstream section of the ascending pipe section (31), the ascending pipe section (31) is located in the first cavity (a), the straight pipe section (33) penetrates through the second cavity (b), the downstream end of the air inlet pipe (3) is communicated with the third cavity (c), and a pipe orifice at the downstream end of the air inlet pipe (3) is higher than the plane where a splicing line is, pipe sections of the air inlet pipe (3) positioned in the first cavity (a) and the second cavity (b) are respectively provided with a plurality of through holes; the air outlet pipe (4) is inserted from an air outlet port (c1) and transversely penetrates through the first mesh plate (6) and the second mesh plate (8), the upstream end of the air outlet pipe (4) is communicated with the first chamber (a), and a pipe section of the air outlet pipe (4) in the second chamber (b) is provided with a plurality of through holes; still include one middle core pipe (5), outlet duct (4) set up between intake pipe (3) and middle core pipe (5) regional, middle core pipe (5) traversing first mesh board (6) and second mesh board (8), the both ends of middle core pipe (5) communicate with first cavity (a), third cavity (c) respectively, the pipeline section that middle core pipe (5) are located second cavity (b) is provided with a plurality of through-holes.

2. The multi-cavity resonant composite muffler according to claim 1, wherein: the straight pipe section (33) of the air inlet pipe (3), the air outlet pipe (4) and the middle core pipe (5) are respectively vertical to the first mesh plate (6).

3. The multi-cavity resonant composite muffler according to claim 1, wherein: the upstream end of the outlet pipe (4) is provided with a tapered hole section (41), and the large-diameter end of the tapered hole section (41) is positioned at the upstream of the small-diameter end.

4. The multi-cavity resonant composite muffler according to claim 1, wherein: the straight pipe section (33) of the air inlet pipe (3), the air outlet pipe (4) and the through holes arranged on the middle core pipe (5) are arranged in a staggered mode.

5. The multi-cavity resonant composite muffler according to claim 1, wherein: a plurality of convex ribs (d) protruding inwards are arranged on the inner wall of the silencer shell, and the extending direction of the convex ribs (d) is perpendicular to the extending direction of the air outlet pipe (4).

6. The multi-cavity resonant composite muffler according to claim 1, wherein: the outer edges of the upper shell and the lower shell (1) are respectively provided with a welding flange (e), and the upper shell and the lower shell (1) are welded into a sealed shell through welding flange seam welding.

7. The multi-cavity resonant composite muffler according to claim 1, wherein: the first mesh plate (6) and the second mesh plate (8) are provided with flanging holes (f) as mounting holes for the air inlet pipe (3), the air outlet pipe (4) or the middle core pipe (5) to pass through.

8. The multi-cavity resonant composite muffler according to claim 1, wherein: the apertures of the meshes arranged on the first mesh plate (6) and the second mesh plate (8) are 3-4mm, and the distance between the meshes is larger than 4 mm.

9. The multi-cavity resonant composite muffler according to claim 1, wherein: the pipe diameter of intake pipe (3) is equidimension with the pipe diameter of outlet duct (4), the pipe diameter of middle core pipe (5) is less than the pipe diameter of outlet duct (4).

10. The multi-cavity resonant composite muffler according to claim 1, wherein: the sound absorption material (g) is glass fiber cotton.

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