CN212716821U

CN212716821U - Silencer for exhaust system of gasoline engine

Info

Publication number: CN212716821U
Application number: CN202021673375.1U
Authority: CN
Inventors: 刘伟; 魏宾; 刘姝凝
Original assignee: Chongqing Kaibao Power Machinery Co ltd
Current assignee: Chongqing Kaibao Power Machinery Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2021-03-16
Anticipated expiration: 2030-08-12

Abstract

The utility model relates to a vehicle accessory technical field, concretely relates to silencer for gasoline engine exhaust system, including casing, intake pipe and outlet duct, be equipped with the echelonment wallboard in the casing, the echelonment wallboard separates first order amortization room and second order amortization room in the casing, the intake pipe runs through and stretches into in the second order amortization room behind the first order amortization room, the inlet end of outlet duct stretches into in the second order amortization room, be equipped with a plurality of baffles in the first order amortization room, the size of each baffle is all different, a plurality of baffles with the lateral wall of intake pipe and the echelonment wallboard form a plurality of resonant cavities that all differ in size jointly; the noise is eliminated by utilizing the resonance sound absorption principle, each resonant cavity has different sizes, the noise elimination frequency band range of the silencer is enlarged, the secondary silencing chamber achieves the purpose of expanding and eliminating noise on the basis of the primary silencing chamber, and the noise elimination effect is improved.

Description

Silencer for exhaust system of gasoline engine

Technical Field

The utility model relates to a vehicle accessory technical field, concretely relates to silencer for gasoline engine exhaust system.

Background

In the exhaust gas discharging process of a gasoline engine, the pressure of the exhaust gas generates continuous pulse airflow at the exhaust pipe opening, the pulse airflow rushes out of the exhaust port at a high speed, the pressure and the speed of the pulse airflow are greatly different from those of the outside air, and harsh exhaust gas noise can be generated. Therefore, in general, a muffler is mounted on an exhaust pipe of an engine, and the muffler is used for consuming airflow energy, reducing the pressure of the airflow and reducing noise.

In recent years, turbocharged engines are widely used by various main engine plants, and have high popularization rate. Turbocharged engines provide powerful power and can improve emissions performance, which is highly appreciated by consumers. However, the turbocharged engine has problems such as turbo lag and generation of high-frequency noise when the supercharger is operated. At present, a main engine plant solves the problem of high-frequency noise of a supercharged engine by optimizing the internal blade structure of a turbocharger, adding a high-frequency silencer, optimizing a calibration strategy and the like.

The traditional silencer has a small number of resonant cavities, is a reactive silencer, has a narrow transmission loss frequency band range and a low silencing peak value, and can only solve the noise problem in a narrow frequency range, but some turbochargers have wide noise frequency band range in the working process, such as HISS noise, and the like, and the traditional silencer structure cannot completely cover the noise frequency band range generated in the working process of the turbochargers.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to overcome the drawbacks of the prior art, and to provide a muffler for an exhaust system of a gasoline engine, which solves the problem of narrow range of noise elimination frequency band in the prior art.

The utility model discloses a silencer for gasoline engine exhaust system, including casing, intake pipe and outlet duct, be equipped with the echelonment wallboard in the casing, the echelonment wallboard is in separate one-level amortization room and second grade amortization room in the casing, the intake pipe runs through stretch into in the second grade amortization room behind the one-level amortization room, the inlet end of outlet duct stretches into in the second grade amortization room, be equipped with a plurality of baffles in the one-level amortization room, the intake pipe runs through the baffle, the size of each baffle is all inequality, and is a plurality of the baffle with the lateral wall of intake pipe with the echelonment wallboard forms a plurality of all inequality resonant cavities jointly, the intake pipe is each lateral wall department in the resonant cavity all is equipped with a plurality of amortization holes.

Further, a silencing assembly is arranged in the secondary silencing chamber, the silencing assembly comprises a first connecting plate, a second connecting plate, a first cavity and a second cavity, the first connecting plate and the second connecting plate are separated from the secondary silencing chamber into the first cavity, the second cavity and the third cavity, the air outlet end of the air inlet pipe extends into the first cavity, the air inlet end of the air outlet pipe extends into the third cavity, the first silencing pipe is inserted into the first connecting plate, the second silencing pipe is inserted into the second connecting plate, the first silencing pipe and the second silencing pipe are respectively provided with an open end and a closed end, the open end of the first silencing pipe extends into the first cavity, the closed end of the first silencing pipe extends into the second cavity, the open end of the second silencing pipe extends into the third cavity, and the closed end of the second silencing pipe extends into the second cavity, and the side walls of the first silencing pipe and the second silencing pipe in the second cavity are provided with silencing hole belts.

Furthermore, the outlet duct is two, just the noise elimination subassembly is two.

Further, the number of the second silencing tubes is two.

Further, the volumes of the different resonant cavities are sequentially increased or decreased in the direction from the air inlet end to the air outlet end of the air inlet pipe.

The utility model has the advantages that: the utility model discloses a silencer for gasoline engine exhaust system has one-level amortization room and second grade amortization room, and the one-level amortization room has a plurality of resonant cavities, utilizes the resonance sound absorption principle to carry out the amortization, and every resonant cavity has different sizes, has improved the noise elimination frequency band scope of silencer, and the second grade amortization room reaches the purpose of expansion amortization again on the basis of one-level amortization room, has improved noise elimination effect.

Drawings

The invention will be further described with reference to the following figures and examples:

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

fig. 2 is a schematic sectional structure of the present invention;

fig. 3 is a schematic structural diagram of the utility model after the casing is hidden.

Description of reference numerals: the silencer comprises a shell 1, an air inlet pipe 2, an air outlet pipe 3, a step-shaped wall plate 4, a primary silencing chamber 5, a secondary silencing chamber 6, a partition plate 7, silencing holes 8, a first connecting plate 9, a second connecting plate 10, a first silencing pipe 11, a second silencing pipe 12, a first cavity 13, a second cavity 14, a third cavity 15 and a silencing hole belt 16.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-3, in the present embodiment, a muffler for an exhaust system of a gasoline engine includes a housing 1, an intake pipe 2, and an exhaust pipe 3, wherein a stepped wall plate 4 is disposed in the housing 1, the stepped wall plate 4 partitions a first-stage muffling chamber 5 and a second-stage muffling chamber 6 in the housing 1, the intake pipe 2 penetrates through the first-stage muffling chamber 5 and then extends into the second-stage muffling chamber 6, an intake end of the exhaust pipe 3 extends into the second-stage muffling chamber 6, a plurality of partition plates 7 are disposed in the first-stage muffling chamber 5, the intake pipe 2 penetrates through the partition plates 7, each partition plate 7 has a different size, the plurality of partition plates 7, a side wall of the intake pipe 2 and the stepped wall plate 4 together form a plurality of resonant cavities with different sizes, in this embodiment, in a direction from the intake end to the exhaust end of the intake pipe 2, the volumes of the different resonance chambers decrease in sequence, in other embodiments, the volumes of the different resonance chambers may increase in sequence, and the gas inlet pipe 2 is provided with a plurality of muffling holes 8 at the side wall of each of the resonance chambers.

In the use process, airflow firstly flows through the first-stage silencing chamber 5 through the air inlet pipe 2, resonance sound absorption occurs in the first-stage silencing chamber 5, and the volumes of all resonance cavities are different, so that the silencer can eliminate noises in multiple frequency bands, the silencing frequency range is widened, and the comfort level of the whole vehicle is improved. The air flow flows out from the air outlet end of the air inlet pipe 2 and enters the secondary silencing chamber 6, the expansion of the cross section realizes the silencing of the expansion chamber, and the silencing effect is further improved.

In this embodiment, a sound-absorbing assembly is disposed in the secondary sound-absorbing chamber, the sound-absorbing assembly includes a first connecting plate 9, a second connecting plate 10, a first sound-absorbing pipe 11 and a second sound-absorbing pipe 12, the first connecting plate 9 and the second connecting plate 10 separate a first cavity 13, a second cavity 14 and a third cavity 15 in the secondary sound-absorbing chamber 6, the air outlet end of the air inlet pipe 2 extends into the first cavity 13, the air inlet end of the air outlet pipe 3 extends into the third cavity 15, the first sound-absorbing pipe 11 is inserted into the first connecting plate 9, the second sound-absorbing pipe 12 is inserted into the second connecting plate 10, each of the first sound-absorbing pipe 11 and the second sound-absorbing pipe 12 has an open end and a closed end, the open end of the first sound-absorbing pipe 11 extends into the first cavity 13, the closed end of the first sound-absorbing pipe 11 extends into the second cavity 14, and the open end of the second sound-absorbing pipe 12 extends into the third cavity 15, the closed end of the second silencing pipe 12 extends into the second cavity 14, and silencing hole belts 16 are respectively arranged on the side walls of the first silencing pipe 11 and the second silencing pipe 12 in the second cavity 14. In the flowing process of the air flow, the kinetic energy and the vibration of the air flow are gradually consumed through the first silencing pipe 11 and the second silencing pipe 12, and the silencing effect is further improved.

In order to balance the air pressure in the secondary muffling chamber 6, in the embodiment, there are two air outlet pipes 3 and two muffling assemblies.

In this embodiment, there are two second muffling tubes 12.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. A muffler for a gasoline engine exhaust system, characterized in that: the air inlet pipe penetrates through the first-stage silencing chamber and then extends into the second-stage silencing chamber, the air inlet end of the air outlet pipe extends into the second-stage silencing chamber, a plurality of partition plates are arranged in the first-stage silencing chamber, the air inlet pipe penetrates through the partition plates, the size of each partition plate is different, the partition plates, the side wall of the air inlet pipe and the stepped wall plate form a plurality of resonant cavities with different sizes together, and a plurality of silencing holes are formed in the side wall of the air inlet pipe in each resonant cavity.

2. A muffler for a gasoline engine exhaust system as set forth in claim 1, wherein: the second-stage silencing chamber is internally provided with a silencing assembly, the silencing assembly comprises a first connecting plate, a second connecting plate, a first silencing pipe and a second silencing pipe, the first connecting plate and the second connecting plate separate a first cavity, a second cavity and a third cavity in the second-stage silencing chamber, the air outlet end of the air inlet pipe extends into the first cavity, the air inlet end of the air outlet pipe extends into the third cavity, the first silencing pipe is inserted into the first connecting plate, the second silencing pipe is inserted into the second connecting plate, the first silencing pipe and the second silencing pipe are respectively provided with an open end and a closed end, the open end of the first silencing pipe extends into the first cavity, the closed end of the first silencing pipe extends into the second cavity, the open end of the second silencing pipe extends into the third cavity, and the closed end of the second silencing pipe extends into the second cavity, and the side walls of the first silencing pipe and the second silencing pipe in the second cavity are provided with silencing hole belts.

3. A muffler for a gasoline engine exhaust system according to claim 2, characterized in that: the number of the air outlet pipes is two, and the number of the noise elimination assemblies is two.

4. A muffler for a gasoline engine exhaust system according to claim 3, characterized in that: the number of the second silencing tubes is two.

5. A muffler for a gasoline engine exhaust system as set forth in claim 1, wherein: and the volumes of different resonant cavities are sequentially increased or decreased in the direction from the air inlet end to the air outlet end of the air inlet pipe.