CN207111277U - A kind of muffler - Google Patents

Abstract

The utility model provides a kind of muffler, belongs to muffling device technical field.It is big that it solves the problems, such as that existing muffler occupies installing space.This muffler includes hush pipe and the internal housing with cavity, at least one baffle plate is provided with housing, cavity in housing is divided into several air cavitys by baffle plate, hush pipe is in bending, the crooked position of hush pipe is in housing, and bending section passes through the baffle plate, has several bloops on bending section, bloop makes hush pipe be connected with air cavity.This muffler, which has, occupies the advantages of installing space is small.

Description

a muffler

technical field

The utility model belongs to the technical field of noise reduction equipment and relates to a noise reduction device.

Background technique

With the continuous improvement of engine technology, supercharged engines are gradually becoming mainstream, but as the market share of supercharged engines continues to increase, the high-frequency noise of supercharged engines after supercharging also gradually affects the NVH performance of the vehicle, making the car's Reduced comfort, leading to a constant decline in customer satisfaction.

In order to reduce noise, improve the NVH performance of the vehicle, and improve customer satisfaction, people will arrange a muffler at the engine intake end of the car. The existing muffler, for example, the Chinese patent literature discloses the muffler [Application No.: 201420661650.6 ; Authorized announcement number: CN204200309A], which includes a primary muffler, a secondary muffler, and a muffler pipe connecting the primary muffler and the secondary muffler. The middle part of the primary muffler is provided with an inlet elbow with a flange. There is an exhaust elbow at the end of the muffler. The primary muffler and the secondary muffler are in the shape of an oval cylinder. The secondary muffler is divided into three air chambers along the axial direction, of which the first air chamber is directly connected to the air inlet. The third air chamber is close to the exhaust port, and there is a second air chamber between the first air chamber and the third air chamber. The air port is provided with an air outlet, and the inner wall of the first air chamber partition is provided with baffles distributed in an elliptical ring shape. The distribution of the baffles changes from dense to sparse to guide the airflow to the outlet of the first air chamber. The third air chamber and The partition between the second air chamber is tapered, and the partition is provided with perforations that are evenly distributed from the top of the cone to the bottom and the aperture gradually becomes larger. The second air chamber is connected to the exhaust port through a straight exhaust pipe, and the exhaust straight The pipe is provided with air inlet holes on the side wall of the second air cavity.

The muffler of this structure adopts a two-stage muffler, and the cavity in the secondary muffler is divided into a first air chamber, a second air chamber and a third air chamber to improve the noise reduction effect. However, the muffler of this structure occupies a large space due to the two-stage muffler; and the secondary muffler of this structure, through the complex arrangement of multiple pipe walls and baffles, divides the space in the secondary muffler The cavity is divided into the first air cavity, the second air cavity and the third air cavity. The pipeline flow in the cavity is complicated and the structure is complex, so the required installation space is relatively large.

Contents of the invention

The purpose of this utility model is to propose a muffler aiming at the above-mentioned problems existing in the prior art, and the technical problem to be solved is how to make the installation space occupied by the muffler small.

The purpose of this utility model can be achieved through the following technical solutions: a muffler, comprising a muffler pipe and a housing with a cavity inside, characterized in that at least one baffle is provided in the housing, and the baffle The cavity in the casing is divided into several air cavities, the sound-absorbing pipe is curved, the curved portion of the sound-absorbing pipe is located in the casing, and the curved portion passes through the baffle, and the curved portion is There are several sound-absorbing holes, and the sound-absorbing holes communicate the sound-absorbing pipe with the air cavity.

The setting of the baffle divides the cavity in the shell into several air cavities. The gas enters the muffler pipe, and then enters the air cavity from the muffler hole to achieve the purpose of muffler. The curved part of the tube is curved, so that the gas does not move along a straight line, so that the gas can better enter the air cavity through the sound-absorbing hole at the corner, and the sound-absorbing effect is improved. This muffler is a first-class muffler, which is small in size and occupies a small installation space; and the muffler pipe is curved, and the curved part is located in the shell. This structure makes the muffler pipe in the shell have a long path while The occupied installation space is small, that is, the housing can be made smaller correspondingly, thereby reducing the installation space.

In the above-mentioned muffler, the number of the baffles is two, and the two baffles are arranged in a V shape, and the several air chambers include a first air chamber, a second air chamber and a third air chamber. chamber, the second air chamber is located in the middle of the first air chamber and the third air chamber, the volume of the first air chamber is smaller than the volume of the second air chamber, and the volume of the second air chamber is smaller than the third air chamber cavity volume. The cavity in the shell is divided into the first air cavity, the second air cavity and the third air cavity through the V-shaped baffle and the bending part of the muffler pipe, so that the pipeline inside the shell is simple and the space occupied is small; and the second air cavity The volume of one air chamber is smaller than the volume of the second air chamber, and the volume of the second air chamber is smaller than the volume of the third air chamber. The frequency of eliminating noise is different for the first air chamber, the second air chamber and the third air chamber with different volumes. Yes, this structure enables the muffler to eliminate noises of different frequencies, and the noise reduction effect is good.

In the aforementioned muffler, both ends of the housing are planar, and the circumferential side walls of the housing include a first side wall, a second side wall and a third side wall, all of which are planar. and an arc-shaped fourth side wall, the included angle between the first side wall and the second side wall is an acute angle, the included angle between the second side wall and the third side wall is an obtuse angle, and the Both ends of the fourth side wall are respectively connected to the first side wall and the third side wall, and one end connected to the baffle is located at the junction of the second side wall and the third side wall, and the other end of one of the baffles is Located at the junction of the first side wall and the fourth side wall, the other end of the other baffle plate is located at the middle of the fourth side wall and is biased towards the first side wall. By matching the V-shaped baffle with the shape of the circumferential side wall of the shell, the installation space occupied by the muffler is small; the angle between the second side wall and the third side wall is obtuse and the V-shaped baffle The cooperation of the plates enables the baffle to better divide the cavity in the housing into three different sizes of the first air cavity, the second air cavity and the third air cavity, rationally utilizing the space and rationally distributing the cavity in the housing.

In the above-mentioned muffler, the muffler pipe further includes an air inlet portion and an air outlet portion, the air inlet portion is fixedly connected to the third side wall, and the air outlet portion is fixedly connected to the second side wall, so The two ends of the bending part are respectively connected with the air inlet part and the air outlet part. The gas enters the curved part from the inlet part, and then comes out from the gas outlet part after passing through the curved part. Chamber, the second air chamber and the third air chamber have a better sound attenuation effect.

In the aforementioned muffler, the first air cavity is close to the air outlet, and the third air cavity is close to the air intake. Reasonable use of space makes the layout of the muffler reasonable.

In the above-mentioned muffler, the curved portion and the baffle are integrally formed, and the curved portion and the baffle are molded at one time by injection molding. It is integrally formed, easy to process, and the stability of the bending part and the baffle is good, and it will not vibrate or make noise when it is impacted by gas.

In the aforementioned muffler, the wall thickness of the housing is 2.5-3.5 mm, and the wall thickness of the bent portion is 2-3 mm. This kind of wall thickness ensures that the muffler will not vibrate when muffled, has good stability and improves the muffler effect.

Compared with the prior art, the muffler provided by the utility model has the following advantages:

1. The silencer pipe is curved, and the curved part of the silencer pipe is located in the shell, so that the silencer pipe in the shell has a long path and occupies a small space, that is, the shell can be made smaller accordingly , thereby reducing the installation space.

2. The two baffles in the muffler shell are set in a V shape, and cooperate with the circumferential side wall of the shell to divide the cavity in the shell into the first air cavity, the second air cavity and the third air cavity with different sizes. The air chambers, the first air chamber, the second air chamber and the third air chamber have different noise elimination frequencies, so that the muffler can eliminate various noises of different frequencies, and the noise reduction effect is good.

Description of drawings

Figure 1 is a schematic diagram of the internal structure of the muffler.

Fig. 2 is a schematic diagram of the overall structure of the muffler.

In the figure, 1. Silencer pipe; 11. Bending portion; 12. Silencer hole; 13. Air intake portion; 14. Air outlet portion; 2. Shell; 21. First side wall; 22. Second side wall; 23. 24, the fourth side wall; 3, the baffle; 4, the first air chamber; 5, the second air chamber; 6, the third air chamber.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in FIG. 1 and FIG. 2 , the muffler includes a muffler pipe 1 , a housing 2 and a baffle 3 .

The inside of the housing 2 has a cavity, the two ends of the housing 2 are planar, and the circumferential side walls of the housing 2 include a first side wall 21, a second side wall 22 and a third side wall 23 all of which are planar. , and the arc-shaped fourth side wall 24, the angle between the first side wall 21 and the second side wall 22 is an acute angle, and the angle between the second side wall 22 and the third side wall 23 is an obtuse angle, Two ends of the fourth side wall 24 are respectively connected to the first side wall 21 and the third side wall 23 , and the above connections are all rounded.

The muffler pipe 1 includes a curved portion 11, an air inlet portion 13 and an air outlet portion 14. The air inlet portion 13 is fixedly connected to the third side wall 23, and the air outlet portion 14 is fixedly connected to the second side wall 22. The curved portion 11 is curved. , the curved portion 11 is located in the housing 2, and the two ends of the curved portion 11 are respectively connected with the air inlet portion 13 and the air outlet portion 14, and the curved portion 11 has a plurality of circular and strip-shaped sound-absorbing holes 12.

As shown in Figure 1, the number of baffles 3 is two, and the two baffles 3 are arranged in a V shape. The curved part 11 of the sound-absorbing pipe 1 passes through the baffles 3, and the baffles 3 and the curved part 11 are of an integrated structure. The curved portion 11 and the baffle 3 are molded at one time by injection molding. One end connected to the baffle plate 3 is located at the junction of the second side wall 22 and the third side wall 23, the other end of one of the baffle plates 3 is located at the junction of the first side wall 21 and the fourth side wall 24, and the other end of the baffle plate 3 is located at the junction of the first side wall 21 and the fourth side wall 24. The other end of 3 is located in the middle of the fourth side wall 24 and is biased towards the first side wall 21 . The baffle 3 divides the cavity in the housing 2 into a first air chamber 4, a second air chamber 5 and a third air chamber 6, and the second air chamber 5 is located in the middle of the first air chamber 4 and the third air chamber 6 , the first air chamber 4 is close to the air outlet 14, the third air chamber 6 is close to the air inlet 13, the volume of the first air chamber 4 is smaller than the volume of the second air chamber 5, and the volume of the second air chamber 5 is smaller than the third air chamber 6 The volume of the chamber 6, the silencer hole 12 makes the silencer pipe 1 communicate with the first air chamber 4, the second air chamber 5 and the third air chamber 6.

In this embodiment, the wall thickness of the shell 2 is 3 mm, and the wall thickness of the curved portion 11 is 2.5 mm. In actual production, the wall thickness of the shell 2 can be 2.5 mm or 3.5 mm, and the wall thickness of the curved portion 11 can be 2mm or 3mm.

This muffler is mainly used to eliminate high-frequency noise with a frequency of 2000-3000Hz. When in use, this muffler is installed in the intercooling pipeline, and the gas enters the bending part 11 from the air inlet 13 of the muffler pipe 1, and then Part of the gas enters the third air chamber 6 through the sound-absorbing hole 12, and then flows back from the third air chamber 6 into the sound-absorbing pipe 1 to realize sound reduction; the gas continues to flow, enters the second air chamber 5 through the sound-absorbing hole 12, and then Flow back from the second air chamber 5 into the muffler pipe 1 to achieve muffler; the gas continues to flow, enters the first air chamber 4 through the muffler hole 12, and then flows back from the first air chamber 4 into the muffler pipe 1 to realize muffler. Finally, it is discharged from the air outlet 14. In this embodiment, the main silencing frequency of the first air chamber 4 is 2550 Hz, the main silencing frequency of the second air chamber 5 is 2200 Hz, and the main silencing frequency of the third air chamber 6 is 2410 Hz. The frequency of the noise makes the muffler have a good noise reduction effect.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Although the muffler pipe 1, the bent portion 11, the muffler hole 12, the air inlet portion 13, the air outlet portion 14, the housing 2, the first side wall 21, the second side wall 22, the third side wall 23, The fourth side wall 24, the baffle plate 3, the first air chamber 4, the second air chamber 5, the third air chamber 6 and other terms, but the possibility of using other terms is not excluded. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is contrary to the spirit of the utility model.

Claims (7)

1. a kind of muffler, including hush pipe (1) and the internal housing (2) with cavity, it is characterised in that the housing (2) In be provided with least one baffle plate (3), the cavity in housing (2) is divided into several air cavitys, the hush pipe by the baffle plate (3) (1) it is in bending, the bending section (11) of the hush pipe (1) is located in housing (2), and the bending section (11) pass through the gear Plate (3), there are several bloops (12) on the bending section (11), the bloop (12) makes hush pipe (1) and air cavity phase Connection.

2. a kind of muffler according to claim 1, it is characterised in that the quantity of the baffle plate (3) is two, two institutes Baffle plate (3) V-shaped setting is stated, several described air cavitys include the first air cavity (4), the second air cavity (5) and the 3rd air cavity (6), institute State the middle that the second air cavity (5) is located at the first air cavity (4) and the 3rd air cavity (6), the volume of first air cavity (4) is less than the The volume of two air cavitys (5), the volume of second air cavity (5) are less than the volume of the 3rd air cavity (6).

3. a kind of muffler according to claim 2, it is characterised in that the both ends of the housing (2) are described in plane The circumferential side wall of housing (2) includes being in plane the first side wall (21), second sidewall (22) and the 3rd side wall (23), and The 4th curved side wall (24), the angle between the first side wall (21) and second sidewall (22) is acute angle, described second Angle between side wall (22) and the 3rd side wall (23) is obtuse angle, the both ends of the 4th side wall (24) respectively with the first side wall (21) it is connected with the 3rd side wall (23), the connected one end of the baffle plate (3) is located at second sidewall (22) and the 3rd side wall (23) Junction, the other end of one of them baffle plate (3) is located at the junction of the first side wall (21) and the 4th side wall (24), another The other end of the individual baffle plate (3) is located at deviation the first side wall (21) place among the 4th side wall (24).

4. a kind of muffler according to claim 3, it is characterised in that the hush pipe (1) also includes intake section (13) With outlet portion (14), the intake section (13) is connected in the 3rd side wall (23), and the outlet portion (14) is connected in second sidewall (22) on, the both ends of the bending section (11) are connected with intake section (13) and outlet portion (14) respectively.

A kind of 5. muffler according to claim 4, it is characterised in that the close outlet portion (14) of first air cavity (4), 3rd air cavity (6) is close to intake section (13).

6. according to a kind of muffler described in claim 1-5 any one, it is characterised in that the bending section (11) and baffle plate (3) it is integral type structure, the bending section (11) and baffle plate (3) are by being molded one-shot forming.

7. according to a kind of muffler described in claim 1-5 any one, it is characterised in that the wall thickness of the housing (2) is 2.5-3.5mm, the wall thickness of the bending section (11) is 2-3mm.