CN219826952U - Muffler - Google Patents

Abstract

A muffler comprises a shell, an air inlet pipe, a passive valve connecting pipe, a passive valve, a bypass pipe, an air outlet pipe and a plurality of baffles. The plurality of baffles includes a first baffle, a second baffle, and a third baffle. The muffler includes a first cavity between the first baffle and the second baffle, a second cavity between the second baffle and the third baffle, a third cavity, and a fourth cavity. An outlet of the air inlet pipe is communicated with the first cavity. The passive valve is configured to communicate the first cavity with the third cavity when open. The first cavity is communicated with the second cavity, and the second cavity is communicated with the fourth cavity. The bypass pipe is communicated with the fourth cavity and the third cavity. The air outlet pipe is communicated with the third cavity. The muffler of the present utility model is advantageous for eliminating low frequency noise by means of the passive valve.

Description

Muffler

Technical Field

The utility model relates to a muffler, and belongs to the technical field of engine exhaust systems.

Background

The muffler in the related art generally includes a housing, an inlet pipe, an outlet pipe, and a number of baffles positioned in the housing.

When the vehicle engine is at 1000 RPM-2000 RPM, obvious low-frequency noise and booming sound are perceived in the vehicle, so that riding comfort is reduced, and customer experience is affected.

For this reason, how to eliminate low frequency noise at low rotational speeds is a problem faced by those skilled in the art.

Disclosure of Invention

The utility model aims to provide a muffler capable of reducing low-frequency noise.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the muffler comprises a shell, an air inlet pipe, a passive valve connecting pipe, a passive valve, a bypass pipe, an air outlet pipe and a plurality of baffles fixed in the shell, wherein the passive valve, the bypass pipe and the air outlet pipe are arranged on the passive valve connecting pipe, the baffles comprise a first baffle, a second baffle and a third baffle which are sequentially arranged at intervals, the muffler comprises a first cavity between the first baffle and the second baffle, a second cavity between the second baffle and the third baffle, a third cavity on one side of the first baffle far away from the first cavity, and a fourth cavity on one side of the third baffle far away from the second cavity; the air inlet pipe is arranged on the second baffle plate and the third baffle plate, and the outlet of the air inlet pipe is communicated with the first cavity; the passive valve is configured to communicate the first cavity with the third cavity when open; the second baffle is provided with a first communication hole which is communicated with the first cavity and the second cavity; the third baffle is provided with a second communication hole which is communicated with the second cavity and the fourth cavity; the bypass pipe is communicated with the fourth cavity and the third cavity; the air outlet pipe is communicated with the third cavity.

As a further improved technical scheme of the utility model, the passive valve connecting pipe is a straight pipe, and one end of the passive valve connecting pipe is opposite to the outlet of the air inlet pipe.

As a further improved technical scheme of the utility model, the passive valve is arranged at the other end of the passive valve connecting pipe, and the passive valve is positioned in the third cavity.

As a further improved technical scheme of the utility model, the pipe body of the air inlet pipe, which is positioned between the second baffle plate and the third baffle plate, is provided with a plurality of airflow perforations communicated with the second cavity.

As a further improved technical scheme of the utility model, the bypass pipe is a straight pipe, and the bypass pipe is erected on the first baffle, the second baffle and the third baffle.

As a further improved technical scheme of the utility model, the air outlet pipe is U-shaped and comprises a first pipe body, a second pipe body and an elbow pipe for connecting the first pipe body and the second pipe body; the first pipe body is erected on the first baffle plate and the second baffle plate; the second pipe body is erected on the first baffle and the second baffle; the bent pipe passes through the second communication hole to protrude into the fourth cavity.

As a further improved technical scheme of the utility model, the first pipe body is communicated with the third cavity, and the second pipe body is provided with an air outlet.

As a further improved technical scheme of the utility model, the shell comprises a first half shell and a second half shell, and the first half shell and the second half shell are welded and fixed; the first baffle, the second baffle, and the third baffle are clamped between the first half shell and the second half shell.

Compared with the prior art, the muffler comprises a shell, an air inlet pipe, a passive valve connecting pipe, a passive valve, a bypass pipe, an air outlet pipe and a plurality of baffles, wherein the passive valve is configured to communicate the first cavity with the third cavity when being opened; so set up, when the passive valve is closed, the bypass pipe forms helmholtz chamber with corresponding cavity body, can eliminate the vibration of certain frequency in the main system: when the passive valve is opened, the third cavity can be utilized to increase the volume, and the air outlet pipe and the interior of the muffler form an expansion cavity, so that low-frequency noise is eliminated; meanwhile, the exhaust back pressure of the muffler can be effectively released, and the power performance of the engine is not affected.

Drawings

Fig. 1 is a schematic perspective view of a muffler of the present utility model in one embodiment.

Fig. 2 is a perspective view of the first half-shell of fig. 1 removed.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a schematic perspective view of another angle of fig. 2.

Fig. 5 is a perspective view of the second half shell of fig. 2 removed.

Detailed Description

Specific embodiments of the present utility model 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 utility model, but rather is merely an example of a product consistent with the utility model as set forth in the claims of the utility model.

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

Referring to fig. 1 to 5, the present utility model discloses a muffler, which comprises a housing 1, an air inlet pipe 2, a passive valve connecting pipe 3, a passive valve 4 mounted on the passive valve connecting pipe 3, a bypass pipe 5, an air outlet pipe 8, and a plurality of baffles fixed in the housing 1.

In the illustrated embodiment of the utility model, the housing 1 comprises a first half-housing 11 and a second half-housing 12, and the first half-housing 11 and the second half-housing 12 are welded and fixed.

The baffles include a first baffle 61, a second baffle 62 and a third baffle 63 which are sequentially arranged at intervals. The first baffle 61, the second baffle 62, and the third baffle 63 are sandwiched between the first half shell 11 and the second half shell 12.

The muffler includes a first cavity 71 between the first baffle 61 and the second baffle 62, a second cavity 72 between the second baffle 62 and the third baffle 63, a third cavity 73 on a side of the first baffle 61 remote from the first cavity 71, and a fourth cavity 74 on a side of the third baffle 63 remote from the second cavity 72.

The air inlet pipe 2 is erected on the second baffle plate 62 and the third baffle plate 63, and the outlet of the air inlet pipe 2 is communicated with the first cavity 71. The pipe body of the air inlet pipe 2 between the second baffle plate 62 and the third baffle plate 63 is provided with a plurality of air flow perforations 21 communicated with the second cavity 72.

The second baffle 62 is provided with a first communication hole 621 communicating the first chamber 71 and the second chamber 72. In the illustrated embodiment of the utility model, the first through holes 621 are small holes.

The third baffle 63 is provided with a second communication hole 631 communicating the second chamber 72 and the fourth chamber 74. In the illustrated embodiment of the present utility model, the second communication hole 631 is an opening.

The bypass pipe 5 communicates the fourth chamber 74 with the third chamber 73. In the illustrated embodiment of the present utility model, the bypass pipe 5 is a straight pipe, and the bypass pipe 5 is installed on the first baffle 61, the second baffle 62, and the third baffle 63.

The air outlet pipe 8 is communicated with the third cavity 73 so as to discharge air flow in the third cavity 73 out of the muffler. In the illustrated embodiment of the present utility model, the air outlet pipe 8 has a U shape, and the air outlet pipe 8 includes a first pipe 81, a second pipe 82, and a bent pipe 83 connecting the first pipe 81 and the second pipe 82; the first pipe 81 is arranged on the first baffle 61 and the second baffle 62; the second pipe 82 is arranged on the first baffle 61 and the second baffle 62; the bent pipe 83 passes through the second communication hole 631 to protrude into the fourth chamber 74. The first pipe 81 is communicated with the third cavity 73, and the second pipe 82 is provided with an air outlet.

In the illustrated embodiment of the present utility model, the passive valve connecting pipe 3 is a straight pipe, and one end of the passive valve connecting pipe 3 faces the outlet of the air inlet pipe 2. The passive valve 4 is mounted at the other end of the passive valve connecting pipe 3, and the passive valve 4 is located in the third cavity 73. The passive valve 4 is configured to communicate the first chamber 71 with the third chamber 73 when opened.

In use, when the air flow pressure is lower than the opening force of the passive valve 4, the passive valve 4 is closed; at this time, the bypass pipe 5 and the corresponding cavity form a helmholtz cavity, so that vibration of a certain frequency in the main system can be eliminated: when the air flow pressure is greater than the opening force of the passive valve 4, the passive valve 4 is opened, and the third cavity 73 can be utilized to increase the volume, and the air outlet pipe 8 and the interior of the muffler form an expansion cavity, so that low-frequency noise is eliminated; meanwhile, the exhaust back pressure of the muffler can be effectively released, and the power performance of the engine is not affected.

The flow direction of the air flow of the muffler is understood by those skilled in the art, and the present utility model will not be repeated.

The above embodiments are only for illustrating the present utility model and not for limiting the technical solutions described in the present utility model, and it should be understood that the present utility model should be based on those skilled in the art, and although the present utility model 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 utility model without departing from the spirit and scope of the present utility model and modifications thereof should be covered by the scope of the claims of the present utility model.

Claims (8)

1. The silencer is characterized by comprising a shell, an air inlet pipe, a passive valve connecting pipe, a passive valve, a bypass pipe, an air outlet pipe and a plurality of baffles fixed in the shell, wherein the passive valve, the bypass pipe and the air outlet pipe are arranged on the passive valve connecting pipe, the baffles comprise a first baffle, a second baffle and a third baffle which are sequentially arranged at intervals, the silencer comprises a first cavity, a second cavity, a third cavity and a fourth cavity, the first cavity is arranged between the first baffle and the second baffle, the second cavity is arranged between the second baffle and the third baffle, the third cavity is arranged on one side, away from the first cavity, of the first baffle, and the fourth cavity is arranged on one side, away from the second cavity, of the third baffle; the air inlet pipe is arranged on the second baffle plate and the third baffle plate, and the outlet of the air inlet pipe is communicated with the first cavity; the passive valve is configured to communicate the first cavity with the third cavity when open; the second baffle is provided with a first communication hole which is communicated with the first cavity and the second cavity; the third baffle is provided with a second communication hole which is communicated with the second cavity and the fourth cavity; the bypass pipe is communicated with the fourth cavity and the third cavity; the air outlet pipe is communicated with the third cavity.

2. The muffler of claim 1, wherein: the passive valve connecting pipe is a straight pipe, and one end of the passive valve connecting pipe is opposite to the outlet of the air inlet pipe.

3. The muffler of claim 2, wherein: the passive valve is arranged at the other end of the passive valve connecting pipe, and the passive valve is positioned in the third cavity.

4. The muffler of claim 1, wherein: the pipe body of the air inlet pipe between the second baffle plate and the third baffle plate is provided with a plurality of airflow perforations communicated with the second cavity.

5. The muffler of claim 1, wherein: the bypass pipe is a straight pipe, and the bypass pipe is erected on the first baffle, the second baffle and the third baffle.

6. The muffler of claim 1, wherein: the air outlet pipe is U-shaped and comprises a first pipe body, a second pipe body and an elbow pipe for connecting the first pipe body and the second pipe body; the first pipe body is erected on the first baffle plate and the second baffle plate; the second pipe body is erected on the first baffle and the second baffle; the bent pipe passes through the second communication hole to protrude into the fourth cavity.

7. The muffler of claim 6, wherein: the first pipe body is communicated with the third cavity, and the second pipe body is provided with an air outlet.

8. The muffler of claim 1, wherein: the shell comprises a first half shell and a second half shell, and the first half shell and the second half shell are fixed by welding; the first baffle, the second baffle, and the third baffle are clamped between the first half shell and the second half shell.