CN210370852U

CN210370852U - Engine silencer

Info

Publication number: CN210370852U
Application number: CN201920822227.2U
Authority: CN
Inventors: 彭蓉; 高超; 高波; 谷林强; 张立新
Original assignee: Anhui Quanchai Engine Co Ltd
Current assignee: Anhui Quanchai Engine Co Ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-04-21
Anticipated expiration: 2029-06-03

Abstract

The utility model discloses an engine silencer, including inside hollow casing, part stretch into the intake pipe in the casing, with intake pipe parallel arrangement's blast pipe, first baffle, second baffle and third baffle, intake pipe and the dense noise elimination aperture that has in blast pipe surface, the casing includes shell and inner shell, be equipped with inclosed vacuum cavity between shell and the inner shell, be equipped with the vacuum on the shell and take out the mouth, be equipped with the sealing plug on the vacuum pump mouth. The vacuum cavity is additionally arranged to control the transmission path of noise, and engine exhaust gas is subjected to noise reduction from the reasons of engine exhaust noise generation, sound transmission and the like, so that the requirement of people on the increasingly high quality of automobiles is met.

Description

Engine silencer

Technical Field

The utility model belongs to the technical field of engine exhaust system and specifically relates to an engine silencer is related to.

Background

With the development of the automobile industry, automobiles enter more and more families, people have higher and higher requirements on the quality of the automobiles, the influence of engine noise is visual impression of users on the quality of the automobiles, the engine exhaust noise is one of main sources of the engine noise, an engine exhaust system has the function of discharging exhaust gas in an engine cylinder into the atmosphere with exhaust resistance and noise as small as possible, a muffler has the function of reducing the exhaust noise, the noise of the engine exhaust system is generated because the exhaust gas discharged by the engine is high-temperature high-pressure exhaust gas which contains certain energy, and the exhaust gas of the engine is intermittent due to the working characteristics of the engine, so that the exhaust gas pulsation of the exhaust gas is caused in the exhaust pipe. In the prior art, most engine mufflers still reduce the exhaust noise around the pulsation of the exhaust pressure reduction and the exhaust pressure attenuation, and although the muffler plays a relatively large noise reduction role compared with a muffler-free structure, with the gradual improvement of the quality requirement of an automobile, the muffler has a relatively small effect of further reducing the noise only from the pulsation angle of the exhaust pressure reduction and the exhaust pressure attenuation, and the required cost is too high. Therefore, it is necessary to consider the noise reduction function of the automobile engine muffler from multiple angles, and the engine muffler of the present invention reduces noise of engine exhaust gas in many aspects, such as the reason of generating engine exhaust noise and the transmission of sound, so as to meet the increasingly high requirements of people on automobile quality.

Chinese patent application publication No. CN201016303Y, the granted announcement date is 2008/02/06, entitled "automobile exhaust muffler," which discloses an automobile exhaust muffler, composed of a pre-muffler and a main muffler, three inner chambers are sequentially arranged in the pre-muffler, an intake pipe and an exhaust pipe are respectively arranged in the inner chambers at both ends, muffling holes are arranged on the intake pipe and the exhaust pipe, four inner chambers are sequentially arranged in the main muffler, three bypass pipes are arranged in the intake pipe parallel to the main muffler, and the three bypass pipes are respectively communicated with the four inner chambers. The intake pipe of main muffler and preceding stage muffler's blast pipe intercommunication, this utility model through set up preceding stage muffler at main muffler's front end, reduced exhaust backpressure, engine power loss is little. The muffler only reduces noise from the pulsation angle of reducing exhaust pressure and attenuating exhaust pressure, is almost the same as the traditional muffler in noise reduction, and cannot meet the requirement of the engine on the noise reduction in the exhaust of the engine at present.

Disclosure of Invention

The utility model discloses an overcome not enough among the prior art, provide an engine silencer, control in the aspect of the propagation way of noise through adding on traditional silencer basis and establishing the vacuum cavity, fall the noise to engine exhaust gas from two aspects of the propagation of reason and the sound that engine exhaust noise produced.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an engine silencer, includes inside hollow casing, intake pipe and blast pipe, characterized by, the casing includes shell and inner shell, the inner shell forms inclosed noise elimination chamber in the casing, the intake pipe with the blast pipe part stretches into in the noise elimination chamber, be equipped with inclosed vacuum cavity between shell and the inner shell for hinder the propagation of noise.

In the scheme, waste gas enters the silencing cavity from the gas inlet pipe and then undergoes expansion and resonance to gradually reduce the exhaust pressure and attenuate the pulsation of the exhaust pressure, and then the gas is discharged through the gas outlet pipe; and simultaneously, the vacuum can insulate heat, the engine waste gas is high-temperature and high-pressure waste gas, the vacuum cavity well isolates heat in the waste gas, and the temperature of the shell of the silencer is reduced.

Preferably, a first partition plate, a second partition plate and a third partition plate are arranged in the muffling cavity, the first partition plate, the second partition plate and the third partition plate are sequentially arranged in parallel at intervals, and the muffling cavity is correspondingly divided into a first cavity, a second cavity, a third cavity and a blocking cavity. Because the first partition plate, the second partition plate and the third partition plate are sequentially arranged in parallel at intervals, the silencing cavity is correspondingly divided into a first cavity, a second cavity, a third cavity and a blocking chamber, waste gas expands in the second cavity and resonates in the first cavity and the third cavity, and the blocking chamber is used for blocking noise of the waste gas.

Preferably, one end of the shell is provided with a front end cover, the other end of the shell is provided with a rear end cover, the front end cover is arranged in parallel with the rear end cover, the air inlet pipe enters the shell from the front end cover, penetrates through the front end cover, the first cavity, the first partition plate and the second cavity and is fixed on the second partition plate, the exhaust pipe enters the shell from the rear end cover, penetrates through the rear end cover, the blocking chamber, the third partition plate, the third cavity, the second partition plate and the second cavity and is fixed on the first partition plate. The air inlet pipe enters the shell from the front end cover, penetrates through the front end cover, the first cavity, the first partition plate and the second cavity and is fixed on the second partition plate, the exhaust pipe enters the shell from the rear end cover, penetrates through the rear end cover, the blocking chamber, the third partition plate, the third cavity, the second partition plate and the second cavity and is fixed on the first partition plate, a reactive muffler is formed, and the effects of reflection, interference, friction and the like of gas in the second cavity, the first cavity and the third cavity can be utilized to achieve the silencing effect.

Preferably, the parts of the air inlet pipe and the exhaust pipe, which are densely provided with sound attenuation small holes, are positioned in the second chamber, and the heat-resistant sound absorption material layer is wrapped on the parts. Because the parts of the air inlet pipe and the exhaust pipe, which are densely provided with the silencing small holes, are positioned in the second chamber, the waste gas is expanded in the second chamber, and the pressure of the waste gas is reduced to the maximum extent; the parts of the surfaces of the air inlet pipe and the exhaust pipe, which are densely provided with the small sound-absorbing holes, are wrapped with the heat-resistant sound-absorbing material layer, and the heat-resistant sound-absorbing material layer is subjected to sound absorption treatment when waste gas is discharged out of the air inlet pipe and enters the exhaust pipe, so that the vibration is reduced, the energy of the waste gas is consumed, and the noise reduction is.

Preferably, the first partition plate and the third partition plate are densely provided with spherical protrusions and pits, and the first partition plate is provided with a plurality of vent holes. Because be equipped with the air vent on the first baffle, waste gas can pass first baffle by the air vent, and first baffle and the dense spherical arch and the pit of being provided with of third baffle, produce diffuse reflection when the sound wave that waste gas produced meets first baffle and third baffle, and the sound wave takes place the multiple reflection in the casing, and the energy consumption makes the noise weaken, and the baffle arrange can support the muffler casing with the silencer inside for muffler casing non-deformable.

Preferably, the second partition board comprises a first cover board, a flange vertically arranged on the edge of the first cover board and a second cover board in clearance fit with the flange, the first cover board and the second cover board are connected through an elastic element, the first partition board is provided with vent holes, and the second partition board is densely provided with small holes. Because the second clapboard is densely provided with the small holes, the waste gas can pass through the second clapboard through the small holes, and the first cover plate and the second cover plate in the second clapboard are connected by the elastic element, so that the second clapboard has a buffering effect on the air flow, the second clapboard can vibrate back and forth in the cyclic reciprocating of compression and extension, the kinetic energy of the air flow can be converted into the elastic potential energy of the elastic element, and the partial energy of the air flow can be consumed, thereby reducing the impact sound of the air flow.

Preferably, a vacuum pumping port is arranged on the shell, and a sealing plug is arranged on the vacuum pumping port. Because the outer shell is provided with the vacuum pumping port, the space between the outer shell and the inner shell of the shell can be pumped through the vacuum pumping port to form a vacuum cavity; the vacuum pumping port is provided with a sealing plug for sealing the vacuum pumping port, so that the vacuum cavity can keep vacuum.

Preferably, the side of the inner shell is corrugated. Because the side surface of the inner shell is corrugated, the waste gas and the sound wave are reflected for many times in the silencer shell, the energy of the waste gas and the sound wave is consumed, and the noise reduction effect is achieved.

Preferably, the exhaust pipe is provided with a secondary muffler device outside the casing. The two-stage noise elimination device is arranged on the part, located outside the shell, of the exhaust pipe, and is used for eliminating noise of waste gas which enters the silencer shell and is subjected to noise elimination and reduction, and waste gas which is not sufficiently eliminated inside the silencer shell is subjected to noise elimination and reduction, so that noise generated by the waste gas is guaranteed to be as small as possible.

Preferably, the secondary muffler device comprises an outer pipe sleeved on the exhaust pipe, the two ends of the outer pipe are hermetically connected with the exhaust pipe, a gap is formed between the outer pipe and the exhaust pipe, muffling holes are densely distributed in the exhaust pipe in the outer pipe, and heat-resistant sound-absorbing materials are filled between the outer pipe and the exhaust pipe. The outer pipe is sleeved on the exhaust pipe which is positioned outside the shell and is densely provided with the silencing holes, a gap is formed between the outer pipe and the exhaust pipe, heat-resistant sound-absorbing materials are filled in the gap, two ends of the outer pipe are hermetically connected with the exhaust pipe, waste gas discharged from the silencer shell expands again to enter the secondary silencing device, and silencing treatment is carried out again through the heat-resistant sound-absorbing materials, exhaust backpressure can be weakened, and the engine is enabled to exhaust smoothly.

The utility model has the advantages that:

(1) the exhaust noise is controlled in the aspect of a transmission way, so that the noise is reduced;

(2) the reflection of the engine waste gas and the sound wave in the silencer shell is increased, the energy of the waste gas and the sound wave is consumed, and the noise reduction is realized; (3) converting and consuming the energy of the waste gas to realize noise reduction;

(4) engine exhaust back pressure may be reduced.

Drawings

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

fig. 2 is a partial cross-sectional view of the present invention;

fig. 3 is a schematic structural view of a first partition plate of the present invention;

FIG. 4 is a schematic view of a second partition structure of the present invention;

fig. 5 is a schematic structural view of a third partition plate of the present invention;

in the figure: the exhaust pipe silencer comprises a shell 1, an outer shell 1.1, an inner shell 1.2, a sealed cavity 1.3, a vacuum pumping port 1.4, a sealing plug 1.5, a front end cover 1.6, a rear end cover 1.7, an air inlet pipe 2, an air inlet pipe mounting hole 2.1, an exhaust pipe 3, an exhaust pipe silencing small hole 3.1, an exhaust pipe mounting hole 3.2, a first partition plate 4, a spherical pit and protrusion 4.1, a vent hole 4.2, a second partition plate 5, a first cover plate 5.1, a second cover plate 5.2, a spring 5.3, a small hole 5.4, a third partition plate 6, a second-level silencing device 7, an outer pipe 7.1 and a glass fiber layer 8.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

The specific embodiment is as follows: as shown in the figure, the engine silencer comprises a shell 1, an air inlet pipe 2, an exhaust pipe 3, a first partition plate 4, a second partition plate 5, a third partition plate 6, a front end cover 1.6 and a rear end cover 1.7, wherein the shell comprises an outer shell and an inner shell, the inner shell of the shell forms a closed silencing cavity, the closed cavity 1.3 is arranged between the outer shell and the inner shell, a vacuum pumping port 1.4 is arranged on the outer shell of the engine, an external vacuum generator can pump vacuum to the closed cavity through the vacuum pumping port to form a closed vacuum cavity, a sealing plug 1.5 is arranged at the vacuum pumping port for sealing the vacuum cavity, the air inlet pipe and the exhaust pipe extend into the silencing cavity from two ends of the shell, the first partition plate, the second partition plate and the third partition plate are fixedly connected in the silencing cavity of the silencer, the exhaust pipe and the air inlet pipe are arranged in parallel, silencing small holes are densely distributed on the surfaces of the air inlet pipe and, the muffling chamber is divided into a first chamber, a second chamber, a third chamber and a baffle chamber, respectively. In this embodiment, 54 small sound-deadening holes with a diameter of 3mm are uniformly arranged on the air inlet pipe extending into the sound-deadening cavity, and 54 small sound-deadening holes with a diameter of 3mm are uniformly arranged on the exhaust pipe extending into the sound-deadening cavity.

The first partition plate, the second partition plate and the third partition plate are sequentially arranged in parallel at intervals, so that the silencing cavity is divided into a first cavity, a second cavity, a third cavity and a blocking cavity which correspond to each other, and the second cavity is used for expanding and depressurizing the exhaust gas discharged by the engine; the first chamber and the third chamber are used for enabling the entering exhaust gas to interfere with each other in the first chamber and the third chamber, so that the silencing effect is achieved; the blocking chamber is arranged on the outermost side of the exhaust gas discharging direction in the silencer shell, so that a certain silencing effect is achieved. A vacuum cavity is formed between the outer shell and the inner shell, the vacuum cavity can not transmit sound, and a noise barrier is formed between the outer shell and the inner shell of the silencer, so that the outward transmission path of the noise in the silencer is limited to a certain extent, and the noise reduction is realized; and simultaneously, the vacuum can insulate heat, the engine waste gas is high-temperature and high-pressure waste gas, the vacuum cavity well isolates heat in the waste gas, and the temperature of the shell of the silencer is reduced.

Furthermore, the air inlet pipe enters the shell from the front end cover, penetrates through the front end cover, the first cavity, the first partition plate and the second cavity and is fixed on the second partition plate, the exhaust pipe enters the shell from the rear end cover, penetrates through the rear end cover, the blocking chamber, the third partition plate, the third cavity, the second partition plate and the second cavity and is fixed on the first partition plate, the part, provided with the sound elimination small holes densely distributed on the surfaces of the air inlet pipe and the exhaust pipe, is positioned in the second cavity, and is wrapped with the heat-resistant sound absorption material layer. The heat-resistant sound-absorbing material can be asbestos, glass fiber and the like, in the embodiment, the heat-resistant sound-absorbing material layer is a glass fiber layer 8, waste gas enters an air inlet pipe of the silencer after being discharged from an engine cylinder and enters the silencer shell through a silencing small hole of the air inlet pipe, because the silencing small hole of the air inlet pipe is coated with a layer of glass fiber, the waste gas is subjected to noise reduction when entering the silencer shell, when the waste gas enters the second cavity through the silencing small hole of the air inlet pipe, the waste gas expands and reduces pressure, the waste gas is diffused to the first cavity and the third cavity after filling the second cavity to consume energy carried by the waste gas, the waste gas is subjected to reflection interference and friction in the first cavity and the third cavity after entering the first cavity and the third cavity to consume energy in the waste gas, then the waste gas returns to the second cavity and enters the exhaust pipe through the silencing, the vibration generated by the impact of the waste gas is reduced, so that the noise of the exhaust is reduced, and the layer of glass fiber is wrapped on the small silencing holes of the exhaust pipe, so that the waste gas entering the exhaust pipe can be subjected to noise reduction again.

Furthermore, spherical protrusions and pits 4.1 are densely distributed on the first partition plate and the third partition plate, a plurality of vent holes are formed in the first partition plate, the second partition plate comprises a first cover plate 5.1, flanges vertically arranged on the edges of the first cover plate and a second cover plate 5.2 in clearance fit with the flanges, the first cover plate and the second cover plate are connected through elastic elements, and small holes are densely distributed in the second partition plate. In this embodiment, the fashioned sphere type arch on first baffle and third baffle surface and pit are stamping forming's panel, first baffle and third baffle are formed by a panel and a bottom plate laminating, it is 8 mm's vent hole to have seted up 4 diameters on first baffle, the same intake pipe mounting hole of diameter and intake pipe and the same blast pipe mounting hole of diameter and blast pipe, diffuse reflection takes place when the sound wave that waste gas produced meets first baffle and third baffle surface, the sound wave takes place the multiple reflection in the casing, energy consumption makes the noise weaken. The elastic elements of the second partition board are springs 5.3, four in total, are symmetrically arranged up and down and left and right, and 78 small holes with the diameter of 2mm, air inlet pipe mounting holes 2.1 with the diameter identical to that of an air inlet pipe and exhaust pipe mounting holes 3.2 with the diameter identical to that of an exhaust pipe are correspondingly formed in the first cover board and the second cover board. Because the first clapboard is provided with the vent holes, the second clapboard is densely provided with the small holes 5.4, the waste gas can pass through the first clapboard and the second clapboard through the vent holes and the small holes, the first cover plate and the second cover plate in the second clapboard are connected by four springs, the waste gas rapidly expands after entering the second chamber, the expanded gas forms acting force on the second clapboard, the acting force causes the springs of the second clapboard to deform and contract, after the waste gas is partially diffused as the first chamber and the third chamber, the acting force of the waste gas on the second clapboard is reduced, the springs of the second clapboard can recover, and the second clapboard can extend for a certain length under the action of inertia and the gas entering the second chamber from the third chamber, so that in circulation, the second clapboard can vibrate back and forth in the cyclic reciprocating of compression and extension, so that the second clapboard has a buffering effect on the gas flow, the kinetic energy of the gas flow can be converted into the elastic potential energy of the springs, and can consume part, thereby reducing the impact sound of the airflow.

Further, the exhaust pipe is provided with a second-stage noise elimination device 7 outside the shell, the second-stage noise elimination device comprises an outer pipe 7.1 sleeved on the exhaust pipe, two ends of the outer pipe are hermetically connected with the exhaust pipe, a gap is formed between the outer pipe and the exhaust pipe, noise elimination holes are densely distributed in the exhaust pipe in the outer pipe, and a heat-resistant sound absorption material is filled between the outer pipe and the exhaust pipe. In the embodiment, 54 small sound-absorbing holes 3.1 with the diameter of 3mm are formed in the part, extending out of the exhaust pipe, glass fiber yarns are filled between the outer pipe and the gap of the exhaust pipe, the secondary sound-absorbing device expands the gas exhausted out of the sound-absorbing shell again, the gas enters the secondary sound-absorbing device and is subjected to noise reduction again through the glass fiber yarns, the noise of exhaust gas is reduced, the exhaust back pressure can be reduced, and the engine can exhaust smoothly.

The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent transformation of doing above embodiment the utility model discloses technical scheme's protection scope.

Claims

1. The utility model provides an engine silencer, includes inside hollow casing, intake pipe and blast pipe, characterized by, the casing includes shell and inner shell, the inner shell forms inclosed noise elimination chamber in the casing, the intake pipe with the blast pipe part stretches into in the noise elimination chamber, be equipped with inclosed vacuum cavity between shell and the inner shell for hinder the propagation of noise.

2. The muffler of claim 1, wherein a first partition, a second partition and a third partition are disposed in the muffling chamber, and the first partition, the second partition and the third partition are sequentially disposed in parallel at intervals to divide the muffling chamber into a first chamber, a second chamber, a third chamber and a blocking chamber.

3. The muffler of claim 2, wherein the housing has a front cover at one end and a rear cover at the other end, the front cover is parallel to the rear cover, the intake pipe enters the housing through the front cover, the intake pipe passes through the front cover, the first chamber, the first partition, and the second chamber and is fixed to the second partition, the exhaust pipe passes through the rear cover and enters the housing, and the exhaust pipe passes through the rear cover, the baffle chamber, the third partition, the third chamber, the second partition, and the second chamber and is fixed to the first partition.

4. The muffler of claim 2, wherein the portions of the intake and exhaust pipes located in the second chamber have sound-deadening pores densely distributed on the surfaces thereof, and the sound-deadening pores are covered with a heat-resistant sound-absorbing material layer.

5. The muffler of claim 2, wherein the first partition and the third partition are densely provided with spherical protrusions and concave pits, and the first partition is provided with a plurality of vent holes.

6. The muffler of claim 2, wherein the second partition comprises a first cover plate, a flange vertically disposed on an edge of the first cover plate, and a second cover plate in clearance fit with the flange, the first cover plate and the second cover plate are connected by an elastic element, and the second partition is densely provided with small holes.

7. An engine muffler as claimed in claim 1, 2 or 3 wherein the housing is provided with a vacuum outlet, the vacuum outlet being provided with a sealing plug.

8. An engine muffler according to claim 1, 2, 3, 4, 5 or 6 wherein the inner surface of the muffling chamber is corrugated.

9. An engine muffler as claimed in claim 1, 2, 3, 4, 5 or 6 wherein the exhaust pipe is provided with a secondary muffler device at the outer part of the housing.

10. The muffler of claim 9, wherein the secondary muffler includes an outer tube sleeved on the exhaust pipe, two ends of the outer tube are hermetically connected to the exhaust pipe, a gap is formed between the outer tube and the exhaust pipe, muffling holes are densely formed in the exhaust pipe located in the outer tube, and a heat-resistant sound-absorbing material is filled between the outer tube and the exhaust pipe.