CN203925669U - A kind of exhaust silencer for urban small automobile - Google Patents

Abstract

An exhaust muffler for urban small cars, the main cavity is divided into a front cavity, a middle cavity and a rear cavity by a front partition and a rear partition; The front chamber is directly inserted into the middle chamber, the air inlet end is connected with a flange, and the air outlet end is provided with a gradually flared mouth, and the part of the pipe wall located in the front chamber is provided with air holes; the front and rear ends of the middle pipe respectively extend It enters the front cavity and the back cavity, and one end extending into the back cavity is closed, and there are air holes on the tube wall of the part located in the middle cavity; one end of the exhaust pipe extends into the front cavity, and the other end passes through the back cavity in turn And the rear end cover, and communicate with the outside, one end extending into the front cavity is provided with a gradual closing port, and the end of the external pipe is provided with a straight exhaust tail section, and the part of the pipe wall located in the rear cavity is provided with Both the front end cover and the rear end cover of the air hole are double-layered, and there is a gap between the inner and outer layers. The utility model can effectively reduce exhaust noise, has a reasonable design and has good application prospects.

Description

An Exhaust Muffler for Urban Small Cars

technical field

The utility model relates to an automobile muffler, in particular to an exhaust muffler for urban small automobiles.

Background technique

Environmental noise pollution refers to the phenomenon that the generated environmental noise exceeds the environmental noise emission standards stipulated by the state and interferes with the normal life, work and study of others. With the improvement of industrialization, the scope of noise hazards is expanding day by day. Traffic noise has become the most important noise source in the current urban environmental noise. Exhaust noise is the main noise source of automobiles and their engines, and mufflers are widely used to control exhaust noise. The most effective means of noise reduction, urban small cars have a relatively high occupancy rate in cities. In the prior art, the muffler performance of most exhaust mufflers depends on the general expansion chamber structure, and the sound waves are directly radiated from the wall of the expansion chamber to the outside world, which directly causes most of the noise to be directly transmitted to the outside world, causing noise pollution.

Therefore, there is a need for an exhaust muffler, which can effectively prevent the radiation of the noise sound waves of urban small SUV vehicles to the outside, effectively eliminate or reduce exhaust noise, and reduce environmental pollution caused by noise.

Utility model content

The purpose of this utility model is to provide a kind of exhaust muffler used for urban small cars in order to solve the deficiencies of the above-mentioned technical problems, which has the advantages such as.

The technical solution adopted by the utility model for solving the above-mentioned technical problems is: an exhaust muffler for urban small cars, including a main cavity, an air intake pipe, an exhaust pipe and an intermediate pipe, and the main cavity is composed of a cavity wall , the front end cover and the rear end cover; the front partition and the rear partition in the main cavity divide the main cavity into the front cavity, the middle cavity and the rear cavity; The front chamber is directly inserted into the middle chamber, the air inlet end is connected with a flange, and the air outlet end is provided with a gradually flared mouth, and there is at least one air hole with a diameter of 6-8mm on the pipe wall of the part located in the front chamber; the middle The front and rear ends of the tube extend into the front cavity and the rear cavity respectively, and one end of the tube extending into the rear cavity is closed, and there is at least one air hole with a diameter of 6-8mm on the tube wall of the part located in the middle cavity; the exhaust pipe One end of the pipe protrudes into the front chamber, and the other end passes through the rear chamber and the rear end cover in turn, and communicates with the outside. One end of the pipe protruding into the front chamber is provided with a gradual closing port, and a straight exhaust tail is provided at the end of the pipe outside. There is at least one air hole on the pipe wall of the part located in the back chamber, and the diameter of the air hole is 2-3mm; the front bulkhead is provided with at least one air hole; the front end cover and the rear end cover are both double-layered. , there is a gap between the inner and outer layers.

The diameter of the pores on the front partition is 6-12mm, the porosity is 10-12%, and there is sound-absorbing material in the front partition.

The sound-absorbing material is continuous glass wool.

There are right-angle flanges around the front partition and the rear partition.

The beneficial effects are:

The utility model is an exhaust muffler for urban small cars, which is ingeniously designed; the cavity wall of the main cavity, the front end cover and the rear end cover adopt a double-layer structure, which can reduce the noise radiation of the muffler through the shell and reduce the noise; the front The partition is equipped with sound-absorbing materials, which can absorb medium and high frequencies and further reduce noise; the middle pipe spans two partitions, and one section is closed to increase the structural strength and further increase the effect of resonance and noise reduction; set two fixed partitions, Two partitions divide the main chamber into three chambers, which stabilize the internal structure of the entire muffler, and have a damping effect on the exhausted gas, further reducing noise; the air outlet of the intake pipe and the air inlet of the exhaust pipe The tapered and tapered shapes are adopted respectively, which can reduce the airflow regeneration noise in the muffler and further reduce the noise; the exhaust pipe tailpipe with the outer straight cylinder can further reduce the outlet noise of the overall muffler. The utility model can effectively reduce exhaust noise, has a reasonable design and has good application prospects.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model exhaust muffler that is used for urban small car;

Fig. 2 is a schematic cross-sectional view of the exhaust muffler shown in Fig. 1 along line A-A;

Fig. 3 is a left side view of the exhaust muffler shown in Fig. 1;

Fig. 4 is a right side view of the exhaust muffler shown in Fig. 1;

The marks in the figure are: 1. main cavity, 11. cavity wall, 12. front end cover, 13. rear end cover, 14. front cavity, 15. middle cavity, 16. rear cavity, 2. intake pipe, 21 flange Disc, 22, gradually flaring mouth 3, exhaust pipe, 31, gradually closing mouth, 32, exhaust tail section, 4, intermediate pipe, 5, front bulkhead, 6, rear bulkhead.

Detailed ways

As shown in Figure 1-4, an exhaust muffler for urban small cars, with a total length of 550 mm, an exhaust muffler for urban small cars, including a main cavity 1, an intake pipe 2, and an exhaust pipe 3 And the intermediate pipe 4, the main cavity 1 is surrounded by the cavity wall 11, the front end cover 12 and the rear end cover 13, and it is characterized in that: the front partition 5 and the rear partition 6 set in the main cavity 1 divide the main cavity The body 1 is divided into a front chamber 14, a middle chamber 15 and a rear chamber 16; the air intake pipe 2 for connecting the automobile exhaust pipe passes through the front chamber 14 and is directly inserted into the middle chamber 15, and the air inlet end is connected with a flange 21, The air outlet end is provided with a gradually flared mouth 22, and at least one air hole with a diameter of 6-8mm is arranged on the tube wall of the part of the front chamber 14; And it stretches into one end port in the rear cavity 16 to be closed, and it is positioned at the tube wall of the inner part of the middle cavity 15 to have at least one air hole with a diameter of 6-8mm; It passes through the rear cavity 16 and the rear end cover 13 in turn, and communicates with the outside. One end of the front cavity 14 is provided with a gradual closing opening 31, and a straight exhaust tail section 32 is provided at the end of the external pipe, which is located at the rear There is at least one air hole on the pipe wall of the part of the cavity 16, and the diameter of the air hole is 2-3mm; the front partition 5 is provided with at least one air hole; the front end cover 12 and the rear end cover 13 are double-layered, There is a gap between the inner and outer layers.

The diameter of the pores on the front partition 5 is 6-12mm, the porosity is 10-12%, and there is suction material in the front partition 5 .

The sound-absorbing material is continuous glass wool.

There are right-angle flanges around the front partition 5 and the rear partition 6 .

The intake pipe 2 of the exhaust muffler of the utility model passes through the front end cover 12 and the front partition 5 in sequence; the exhaust pipe 3 passes through the front partition 5, the rear partition 6 and the rear end cover 13 in sequence; the front port of the middle pipe 4 is located at In the front chamber 14 cavities, although the rear end is located in the middle chamber 15, it is closed, and sound and air flow can only enter the front chamber 14 through the large hole on the middle pipe 4. On the one hand, the noise entering the intake pipe 2 enters the main cavity 1 for noise reduction, and part of the noise acts on the front chamber 14 through the air holes on the intake pipe 2 to resonate; because one end of the middle pipe 4 is closed, the noise in the middle cavity 15 can only Enter the front chamber 14 through the middle pipe 4 to eliminate noise, and some noise is eliminated through the small air holes on the front partition 5; finally, the noise in the front chamber 14 is resonated through the small holes on the exhaust pipe 3, and there is also a rear chamber. 16. The medium and high frequency sound absorption effect of the continuous glass wool inside the muffler; the air outlet of the air intake pipe 2, the air inlet and the air outlet of the exhaust pipe 3 respectively adopt tapered and gradually expanded shapes, which is beneficial to reduce the generation of air regeneration noise in the muffler , to further reduce the noise to the outside world.

Claims (3)

1. a kind of exhaust muffler that is used for urban small car, comprises main chamber body (1), intake pipe (2), exhaust pipe (3) and middle pipe (4), and described main chamber body (1) is made of The cavity wall (11), the front end cover (12) and the rear end cover (13) are surrounded, and it is characterized in that: the front partition (5) and the rear partition (6) set in the main cavity (1) divide the main cavity The body (1) is divided into a front cavity (14), a middle cavity (15) and a rear cavity (16); the air intake pipe (2) for connecting the automobile exhaust pipe passes through the front cavity (14) and is directly inserted into the middle cavity (15) ), the air inlet end is connected with a flange (21), and the air outlet end is provided with a gradually flared mouth (22), and there is at least one pipe wall with a diameter of 6-8mm on the part of the front cavity (14). Air holes; the front and rear ends of the middle pipe (4) stretch into the front chamber (14) and the rear chamber (16) respectively, and the end port extending into the rear chamber (16) is closed, and it is located in the inner part of the middle chamber (15). There is at least one air hole with a diameter of 6-8mm on the pipe wall; one end of the exhaust pipe (3) stretches into the front cavity (14), and the other end passes through the rear cavity (16) and the rear end cover (13) successively, and It communicates with the outside, and one end extending into the front chamber (14) is provided with a gradual closing port (31), and a straight cylinder-shaped exhaust tail section (32) is provided at the end of the external pipe, which is located in the part of the rear chamber (16) There is at least one air hole on the pipe wall, and the diameter of the air hole is 2-3mm; the front partition (5) is provided with at least one air hole; the front end cover (12) and the rear end cover (13) are double-layered setting, there is a gap between the inner and outer layers; Right-angle flanges are arranged around the front partition (5) and the rear partition (6). 2. The exhaust muffler as claimed in claim 1, characterized in that: the diameter of the pores on the front bulkhead (5) is 6-12mm, and the porosity is 10-12%. With sound-absorbing material. 3. The exhaust muffler according to claim 2, characterized in that: said sound-absorbing material is continuous glass wool.