CN117846743A - Silencer (muffler) - Google Patents

Abstract

A silencer comprises an outer shell, a first end cover, a second end cover, a plurality of baffles, an air inlet pipe, an air inlet side branch pipe assembly, an exhaust valve arranged on the air inlet pipe, a first air outlet pipe and a second air outlet pipe. The plurality of baffles includes a first baffle and a second baffle. The muffler includes a first cavity between the first baffle and the second baffle, a second cavity between the first baffle and the first end cap, and a third cavity between the second baffle and the second end cap; the first cavity is communicated with the second cavity and the third cavity. The first air outlet pipe is communicated with the second cavity, and the second air outlet pipe is communicated with the third cavity; the intake bypass pipe assembly comprises an intake bypass pipe and a plug. The air inlet pipe, the air inlet side branch pipe component and the exhaust valve jointly form a resonant cavity, so that specific frequency can be eliminated, and the low-rotation-speed single-frequency elimination effect can be achieved.

Description

Silencer (muffler)

Technical Field

The invention relates to a silencer, and belongs to the technical field of engine exhaust systems.

Background

When the PHEV vehicle is in chassis arrangement, the larger battery pack causes the smaller and smaller space of the muffler of the exhaust system, even one muffler is eliminated, and the smaller muffler volume is used for meeting the acoustic performance requirement.

Accordingly, those skilled in the art are faced with how to optimize a muffler to meet the above needs.

Disclosure of Invention

The invention aims to provide a silencer with good acoustic performance.

In order to achieve the above purpose, the invention adopts the following technical scheme: the silencer comprises an outer shell, a first end cover, a second end cover, a plurality of baffles, an air inlet pipe, an air inlet side branch pipe assembly, an exhaust valve, a first air outlet pipe and a second air outlet pipe, wherein the first end cover is fixed at one end of the outer shell, the second end cover is fixed at the other end of the outer shell, the baffles are positioned in the outer shell, the air inlet side branch pipe assembly is communicated with the air inlet pipe, the exhaust valve is arranged on the air inlet pipe, the first air outlet pipe and the second air outlet pipe are arranged on the air inlet pipe, the baffles comprise a first baffle and a second baffle, and the first end cover, the first baffle, the second baffle and the second end cover are sequentially arranged at intervals; the muffler includes a first cavity between the first baffle and the second baffle, a second cavity between the first baffle and the first end cap, and a third cavity between the second baffle and the second end cap; the first cavity is communicated with the second cavity; the first cavity is communicated with the third cavity; the air inlet pipe at least partially extends into the first cavity; the first air outlet pipe is communicated with the second cavity, and the second air outlet pipe is communicated with the third cavity; the air inlet side branch pipe assembly comprises an air inlet side branch pipe and a plug which is sealed at the air outlet end of the air inlet side branch pipe; the part of the air inlet side branch pipe connected with the air inlet pipe is positioned at the upstream of the exhaust valve along the air flow direction; the exhaust valve can be opened when the pressure of the air flow reaches a certain value.

As a further improved technical scheme of the invention, the baffles further comprise a third baffle and a fourth baffle, wherein the third baffle is positioned between the first end cover and the first baffle; the second cavity includes a first expansion cavity between the first baffle and the third baffle and a second expansion cavity between the third baffle and the first end cap;

the fourth baffle is positioned between the second end cap and the second baffle; the third cavity includes a third expansion cavity between the second baffle and the fourth baffle and a fourth expansion cavity between the fourth baffle and the second end cap.

As a further improved technical scheme of the invention, the air inlet side branch pipe is L-shaped, the air inlet side branch pipe comprises a first pipe body and a second pipe body perpendicular to the first pipe body, the first pipe body penetrates through the first baffle and the third baffle, and the second pipe body is positioned in the second expansion cavity.

As a further improved technical scheme of the invention, the air inlet pipe comprises a plurality of first air flow perforations which are positioned between the first pipe body and the exhaust valve and penetrate through the pipe wall of the air inlet pipe; the first plurality of airflow perforations are in communication with the first cavity.

As a further improved technical scheme of the invention, the silencer further comprises a first return pipe arranged on the first baffle plate and the third baffle plate, one end of the first return pipe is communicated with the first cavity, and the other end of the first return pipe is communicated with the second expansion cavity; the first return pipe is also provided with a plurality of first openings which penetrate through the pipe wall and are communicated with the first expansion cavity.

As a further improved technical scheme of the invention, the silencer further comprises a second return pipe arranged on the second baffle plate and the fourth baffle plate, one end of the second return pipe is communicated with the first cavity, and the other end of the second return pipe is communicated with the fourth expansion cavity; the second return pipe is also provided with a plurality of second openings which penetrate through the pipe wall and are communicated with the third expansion cavity.

As a further improved technical scheme of the invention, the first air outlet pipe penetrates through the third baffle plate, the first baffle plate, the second baffle plate and the fourth baffle plate, one end of the first air outlet pipe is communicated with the second expansion cavity, and the other end of the first air outlet pipe is provided with a first air outlet exposed to the second end cover.

As a further improved technical scheme of the invention, the second air outlet pipe penetrates through the fourth baffle plate, the second baffle plate, the first baffle plate and the third baffle plate, one end of the second air outlet pipe is communicated with the fourth expansion cavity, and a second air flow outlet exposed to the first end cover is arranged at the other end of the second air outlet pipe.

As a further improved technical scheme of the invention, the first baffle is provided with a plurality of first airflow perforations which are communicated with the first cavity and the first expansion cavity, the second baffle is provided with a plurality of second airflow perforations which are communicated with the first cavity and the third expansion cavity, the third baffle is provided with a plurality of third airflow perforations which are communicated with the first expansion cavity and the second expansion cavity, and the fourth baffle is provided with a plurality of fourth airflow perforations which are communicated with the third expansion cavity and the fourth expansion cavity.

As a further improved technical scheme of the invention, the silencer further comprises a supporting plate, wherein two ends of the supporting plate are respectively fixedly connected with the first baffle plate and the second baffle plate, and the air inlet pipe at least partially penetrates through and is fixed with the supporting plate.

Compared with the prior art, the air inlet side branch pipe assembly comprises an air inlet side branch pipe and a plug sealed at the air outlet end of the air inlet side branch pipe; the part of the air inlet side branch pipe connected with the air inlet pipe is positioned at the upstream of the exhaust valve along the air flow direction; when the engine is at low rotation speed, the exhaust valve is closed, one part of sound waves are expanded into the silencer through the air inlet pipe, the other part of sound waves enter the air inlet side branch pipe, and the sound waves cannot enter the silencer due to the plug at the air outlet end of the air inlet side branch pipe, and the air inlet pipe, the air inlet side branch pipe assembly and the exhaust valve jointly form a resonant cavity of a quarter-wave pipe, so that specific frequency can be eliminated, and the low rotation speed single frequency elimination effect is achieved; when the engine rotates at a high speed, the exhaust valve is opened, sound waves enter the muffler, and medium-high frequency energy is eliminated through the first cavity, the second cavity and the third cavity.

Drawings

FIG. 1 is a perspective view of the muffler of the present invention with the outer shell removed;

FIG. 2 is a schematic perspective view of the intake pipe, the intake side branch pipe assembly, and the exhaust valve of FIG. 1 shown connected together;

fig. 3 is an exploded perspective view of fig. 2.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the attached drawings, wherein features of the embodiments may be combined with each other without conflict if several embodiments exist. When the description refers to the accompanying drawings, the same numbers or symbols in different drawings indicate the same or similar elements unless otherwise indicated. What is described in the following exemplary embodiments does not represent all embodiments of the invention, but rather is merely an example of a product consistent with the invention as set forth in the claims of the invention.

The terminology used in the present invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention. It should be understood that words such as "first," "second," and the like, used in the description and in the claims of the present invention, do not denote any order, quantity, or importance, but rather are names used to distinguish one feature from another.

Referring to fig. 1 to 3, the present invention discloses a muffler for an exhaust system of a vehicle, which includes an outer case (not shown), a first end cap 11 fixed to one end of the outer case, a second end cap 12 fixed to the other end of the outer case, a plurality of baffles positioned in the outer case, an intake pipe 21, an intake side branch pipe assembly 3 communicating with the intake pipe 21, an exhaust valve 22 mounted on the intake pipe 21, a first exhaust pipe 41, and a second exhaust pipe 42.

The number of baffles includes a first baffle 51 and a second baffle 52. The first end cover 11, the first baffle 51, the second baffle 52 and the second end cover 12 are sequentially arranged at intervals. The muffler includes a first cavity 101 between the first baffle 51 and the second baffle 52, a second cavity 102 between the first baffle 51 and the first end cap 11, and a third cavity 103 between the second baffle 52 and the second end cap 12; the first cavity 101 is communicated with the second cavity 102; the first cavity 101 communicates with the third cavity 103.

The air inlet pipe 21 extends at least partially into the first cavity 101; the first air outlet pipe 41 is communicated with the second cavity 102, and the second air outlet pipe 42 is communicated with the third cavity 103.

The intake side branch pipe assembly 3 comprises an intake side branch pipe 31 and a plug 32 sealed at the outlet end of the intake side branch pipe 31. As will be appreciated by those skilled in the art, since the outlet end of the intake side branch pipe 31 is blocked by the plug 32 in the present invention, the air flow entering the intake side branch pipe 31 cannot flow out from the outlet end of the intake side branch pipe 31. The intake side branch pipe 31 in the present invention is completely different from the internal pipe body having an intake port and an exhaust port in the related art.

The part of the intake side branch pipe 31 connected to the intake pipe 21 is located upstream of the exhaust valve 22 in the gas flow direction; the exhaust valve 22 can be opened when the pressure of the air flow reaches a certain value.

Specifically, in the illustrated embodiment of the present invention, the plurality of baffles further includes a third baffle 53 and a fourth baffle 54, wherein the third baffle 53 is located between the first end cap 11 and the first baffle 51; the second cavity 102 includes a first expansion cavity 102a between the first baffle 51 and the third baffle 53 and a second expansion cavity 102b between the third baffle 53 and the first end cap 11.

Similarly, the fourth baffle 54 is located between the second end cap 12 and the second baffle 52; the third cavity 103 includes a third expansion chamber 103a between the second baffle plate 52 and the fourth baffle plate 54 and a fourth expansion chamber 103b between the fourth baffle plate 54 and the second end cap 12.

In the illustrated embodiment of the present invention, the intake side branch pipe 31 is L-shaped, the intake side branch pipe 31 includes a first pipe body 311 and a second pipe body 312 perpendicular to the first pipe body 311, the first pipe body 311 penetrates the first baffle plate 51 and the third baffle plate 53, and the second pipe body 312 is located in the second expansion chamber 102b. In the illustrated embodiment of the invention, the intake-side branch pipe 31 is much thinner than the intake pipe 21.

In the illustrated embodiment of the invention, the intake pipe 21 comprises a plurality of first air flow perforations 211 located between the first pipe body 311 and the exhaust valve 22 and penetrating the pipe wall of the intake pipe 21; the first plurality of airflow perforations 211 is in communication with the first cavity 101.

The muffler further comprises a support plate 23 with two ends fixedly connected with the first baffle plate 51 and the second baffle plate 52, respectively, and the air inlet pipe 21 at least partially penetrates through and is fixed with the support plate 23.

In the illustrated embodiment of the present invention, the muffler further includes a first return pipe 61 installed on the first baffle 51 and the third baffle 53, one end of the first return pipe 61 is communicated with the first chamber 101, and the other end of the first return pipe 61 is communicated with the second expansion chamber 102 b; the first return tube 61 is further provided with a number of first openings 611 penetrating its tube wall and communicating with the first expansion chamber 102 a.

Similarly, the muffler further includes a second return pipe 62 provided on the second baffle plate 52 and the fourth baffle plate 54, one end of the second return pipe 62 communicates with the first chamber 101, and the other end of the second return pipe 62 communicates with the fourth expansion chamber 103 b; the second return tube 62 is further provided with a number of second openings 621 extending through its wall and communicating with the third expansion chamber 103 a.

The first air outlet pipe 41 penetrates through the third baffle 53, the first baffle 51, the second baffle 52 and the fourth baffle 54, one end of the first air outlet pipe 41 is communicated with the second expansion cavity 102b, and a first air outlet 411 exposed to the second end cover 12 is arranged at the other end of the first air outlet pipe 41.

The second air outlet pipe 42 penetrates through the fourth baffle 54, the second baffle 52, the first baffle 51 and the third baffle 53, one end of the second air outlet pipe 42 is communicated with the fourth expansion cavity 103b, and a second air outlet 421 exposed to the first end cover 11 is provided at the other end of the second air outlet pipe 42.

The first baffle plate 51 is provided with a plurality of first air flow perforations 511 communicating the first cavity 101 with the first expansion cavity 102a, the second baffle plate 52 is provided with a plurality of second air flow perforations 521 communicating the first cavity 101 with the third expansion cavity 103a, the third baffle plate 53 is provided with a plurality of third air flow perforations 531 communicating the first expansion cavity 102a with the second expansion cavity 102b, and the fourth baffle plate 54 is provided with a plurality of fourth air flow perforations 541 communicating the third expansion cavity 103a with the fourth expansion cavity 103b.

Compared with the prior art, the air inlet side branch pipe assembly 3 comprises an air inlet side branch pipe 31 and a plug 32 sealed at the air outlet end of the air inlet side branch pipe 31; the part of the intake side branch pipe 31 connected to the intake pipe 21 is located upstream of the exhaust valve 22 in the gas flow direction; when the engine is at a low rotation speed, the exhaust valve 22 is closed, a part of sound waves are expanded into the silencer through the air inlet pipe 21, and the other part of sound waves enter the air inlet side branch pipe 31, and as the air outlet end of the air inlet side branch pipe 31 is provided with the plug 32, the sound waves cannot enter the silencer, the air inlet pipe 21, the air inlet side branch pipe assembly 3 and the exhaust valve 22 jointly form a resonant cavity of a quarter-wave pipe, so that the volume of the silencer is increased, specific frequency can be eliminated, and a low rotation speed single frequency elimination effect is achieved; when the engine is at a high speed, the exhaust valve 22 is opened, sound waves enter the muffler, and medium-high frequency energy is removed through the first chamber 101, the second chamber 102, and the third chamber 103. Finally, the air flow is released to the atmosphere through the first air outlet duct 41 and the second air outlet duct 42.

The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and it should be understood that the present invention should be based on those skilled in the art, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the present invention without departing from the spirit and scope of the present invention and modifications thereof should be covered by the scope of the claims of the present invention.

Claims (10)

1. The silencer is characterized by comprising an outer shell, a first end cover, a second end cover, a plurality of baffles, an air inlet pipe, an air inlet side branch pipe assembly, an exhaust valve, a first air outlet pipe and a second air outlet pipe, wherein the first end cover is fixed at one end of the outer shell, the second end cover is fixed at the other end of the outer shell, the baffles are positioned in the outer shell, the air inlet side branch pipe assembly is communicated with the air inlet pipe, the exhaust valve is arranged on the air inlet pipe, the first air outlet pipe and the second air outlet pipe are arranged on the air inlet pipe, the baffles comprise a first baffle and a second baffle, and the first end cover, the first baffle, the second baffle and the second end cover are sequentially arranged at intervals; the muffler includes a first cavity between the first baffle and the second baffle, a second cavity between the first baffle and the first end cap, and a third cavity between the second baffle and the second end cap; the first cavity is communicated with the second cavity; the first cavity is communicated with the third cavity; the air inlet pipe at least partially extends into the first cavity; the first air outlet pipe is communicated with the second cavity, and the second air outlet pipe is communicated with the third cavity; the air inlet side branch pipe assembly comprises an air inlet side branch pipe and a plug which is sealed at the air outlet end of the air inlet side branch pipe; the part of the air inlet side branch pipe connected with the air inlet pipe is positioned at the upstream of the exhaust valve along the air flow direction.

2. The muffler of claim 1, wherein: the plurality of baffles further comprises a third baffle and a fourth baffle, wherein the third baffle is positioned between the first end cover and the first baffle; the second cavity includes a first expansion cavity between the first baffle and the third baffle and a second expansion cavity between the third baffle and the first end cap;

the fourth baffle is positioned between the second end cap and the second baffle; the third cavity includes a third expansion cavity between the second baffle and the fourth baffle and a fourth expansion cavity between the fourth baffle and the second end cap.

3. The muffler of claim 2, wherein: the side branch pipe that admits air is L, the side branch pipe that admits air includes first body and perpendicular to the second body of first body, first body runs through first baffle with the third baffle, the second body is located in the second expansion chamber.

4. The muffler of claim 3, wherein: the air inlet pipe comprises a plurality of first air flow perforations which are positioned between the first pipe body and the exhaust valve and penetrate through the pipe wall of the air inlet pipe; the first plurality of airflow perforations are in communication with the first cavity.

5. The muffler of claim 2, wherein: the silencer further comprises a first return pipe which is arranged on the first baffle plate and the third baffle plate, one end of the first return pipe is communicated with the first cavity, and the other end of the first return pipe is communicated with the second expansion cavity; the first return pipe is also provided with a plurality of first openings which penetrate through the pipe wall and are communicated with the first expansion cavity.

6. The muffler of claim 2, wherein: the silencer further comprises a second return pipe which is arranged on the second baffle plate and the fourth baffle plate, one end of the second return pipe is communicated with the first cavity, and the other end of the second return pipe is communicated with the fourth expansion cavity; the second return pipe is also provided with a plurality of second openings which penetrate through the pipe wall and are communicated with the third expansion cavity.

7. The muffler of claim 2, wherein: the first air outlet pipe penetrates through the third baffle, the first baffle, the second baffle and the fourth baffle, one end of the first air outlet pipe is communicated with the second expansion cavity, and a first air outflow opening exposed to the second end cover is formed in the other end of the first air outlet pipe.

8. The muffler of claim 2, wherein: the second air outlet pipe penetrates through the fourth baffle, the second baffle, the first baffle and the third baffle, one end of the second air outlet pipe is communicated with the fourth expansion cavity, and a second air outlet exposed to the first end cover is formed in the other end of the second air outlet pipe.

9. The muffler of claim 2, wherein: the first baffle is provided with a plurality of first airflow perforations communicated with the first cavity and the first expansion cavity, the second baffle is provided with a plurality of second airflow perforations communicated with the first cavity and the third expansion cavity, the third baffle is provided with a plurality of third airflow perforations communicated with the first expansion cavity and the second expansion cavity, and the fourth baffle is provided with a plurality of fourth airflow perforations communicated with the third expansion cavity and the fourth expansion cavity.

10. The muffler of claim 1, wherein: the silencer further comprises a supporting plate, two ends of the supporting plate are fixedly connected with the first baffle and the second baffle respectively, and the air inlet pipe at least partially penetrates through and is fixed with the supporting plate.