CN209569049U - Rear muffler and internal combustion engine exhaust system - Google Patents

Abstract

The utility model has good acoustic attenuation performance about rear muffler and internal combustion engine exhaust system.The rear muffler includes shell；Pipeline, the first nozzle, the second nozzle including the first pipe shaft and positioned at first pipe shaft both ends, first nozzle is located at the upstream of second nozzle, and first pipe shaft offers at least one outlet hole section, and the venthole section is located at the downstream of first nozzle；At least one partition is AND DEWATERING FOR ORIFICE STRUCTURE；Each outlet hole section of at least one outlet hole section is provided with a partition in corresponding association downstream, and one partition constitutes resonant cavity with the part that the shell is located downstream.

Description

Rear muffler and internal combustion engine exhaust system

Technical field

The utility model belongs to field of acoustics more particularly to a kind of rear muffler and internal combustion engine exhaust system.

Background technique

The acoustic attenuation performance of rear muffler has large effect for the acoustical behavior of internal combustion engine exhaust system and vehicle. Such as the Chinese utility model patent that Authorization Notice No. is CN206530393U discloses a kind of rear noise elimination of automobile exhaust system Device is provided with partition in shell, and air inlet pipe is by an end cap and membrane support, and exhaust pipe is by another end cap and partition branch Support, for intermediate tube by membrane support, exhaust enters silencer from the entrance of air inlet pipe, successively by air inlet pipe, air inlet pipe outlet, in Between tube inlet, intermediate tube, intermediate tube outlet, air inlet tube inlet, air inlet pipe outlet, utilize bloop, the noise reduction fiber in pipe shaft And other positions carry out noise reduction.

But the utility model inventor has found that rear muffler there is also further rooms for improvement, especially It is to need efficiently to be eliminated the noise for noise caused by the specific rotary speed area of internal combustion engine.

Utility model content

The purpose of this utility model is to provide a kind of rear mufflers, with good acoustic attenuation performance.

The purpose of this utility model is to provide a kind of internal combustion engine exhaust systems, with good acoustical behavior.

According to a kind of rear muffler of the utility model one side, including shell；Pipeline, including the first pipe shaft and be located at First nozzle, second nozzle at first pipe shaft both ends, first nozzle are located at the upstream of second nozzle, and described One pipe shaft offers the first outlet hole section and the second outlet hole section, and the first venthole section is located under first nozzle Trip, the second venthole section are located at the downstream of the first outlet hole section；First partition is AND DEWATERING FOR ORIFICE STRUCTURE, by the shell Inside is divided into shell first part and housing second portion；Second partition is AND DEWATERING FOR ORIFICE STRUCTURE, is located at the shell second Point, the housing second portion is separated into shell Part III and shell Part IV；First pipe shaft passes through described the One partition and second partition, the first venthole section are located at the shell first part, and the housing second portion is set It is set to and associated first resonant cavity of the first outlet hole section；The second venthole section is located at the third portion of the shell Point, the shell Part IV is configured to and associated second resonant cavity of the second outlet hole section.

In the embodiment of the rear muffler, the hole area of the second outlet hole section is greater than the first outlet hole section Hole area.

In the embodiment of the rear muffler, the pipeline is air inlet pipe, and the silencer further includes third partition, the Four partitions are AND DEWATERING FOR ORIFICE STRUCTURE, and the third partition, the 4th partition are disposed adjacent, and the shell first part is separated shelling Body Part V, shell Part VI and shell Part VII；And intermediate tube, exhaust pipe；The air inlet pipe is located at from it First nozzle of shell starts, and across the 4th partition, third partition and first partition, second partition and terminates at the second nozzle Second resonant cavity at place；The exhaust pipe includes the second pipe shaft and third nozzle, the 4th nozzle, and the exhaust pipe is by being located at The third nozzle of the shell Part VII starts, and across the 4th partition, third partition, first partition, second partition and terminates In the 4th nozzle for being located at shell；The intermediate tube is between the air inlet pipe and the exhaust pipe；The intermediate tube includes Third pipe shaft and the 5th nozzle, the 6th nozzle, the intermediate tube are originated by the 5th nozzle for being located at shell Part V, are passed through 4th partition and third partition, and terminate at the shell Part VII；Positioned at described the first of the shell Part VI Bloop is distributed in pipe shaft, the second pipe shaft and third pipe shaft respectively, and the rest of the shell Part VI is by noise reduction fibre Dimension filling.

In the embodiment of the rear muffler, the hole area of the first partition is greater than the hole area of second partition.

In the embodiment of the rear muffler, second pipe shaft is located at the portion of the first resonant cavity and the second resonant cavity The second bloop is distributed with, second bloop periphery is surrounded with high frequency sound attenuation assembly.

In the embodiment of the rear muffler, first pipe shaft, the second pipe shaft and third pipe shaft respectively include One straight pipe, the second straight pipe and third straight pipe, the axis of first straight pipe, the second straight pipe and third straight pipe Line is parallel.

In the embodiment of the rear muffler, second straight pipe includes multiple straight tube segmentations, the straight tube segmentation Axis it is parallel, adjacent straight tube segmentation is connected by bend pipe.

In the embodiment of the rear muffler, the shell is cylindrical shell, including side wall and closes off side wall The first end cover and second end cover at both ends.

According to a kind of rear muffler of the utility model one side, including shell；Pipeline, including the first pipe shaft and be located at First nozzle, second nozzle at first pipe shaft both ends, first nozzle are located at the upstream of second nozzle, and described One pipe shaft offers at least one outlet hole section, and the venthole section is located at the downstream of first nozzle；At least one partition, For AND DEWATERING FOR ORIFICE STRUCTURE；Each outlet hole section of at least one outlet hole section corresponding association downstream be provided with one every Plate, one partition constitute resonant cavity with the part that the shell is located downstream.

According to a kind of internal combustion engine exhaust system of the utility model another aspect, including disappearing after described in any of the above one Sound device.

The beneficial effects of the utility model are, venthole section and corresponding total is arranged using the pipeline in rear muffler The setting of vibration chamber, makes it possible to and is efficiently eliminated the noise for noise caused by the specific rotary speed area of internal combustion engine, optimizes The acoustical behavior of exhaust system and the NVH performance of vehicle.

Detailed description of the invention

The above and other feature, property and advantage of the utility model will be by with reference to the accompanying drawings and examples Description and become readily apparent from, in which:

Fig. 1 is the schematic cross-sectional view according to the rear muffler of an embodiment of the present invention；

Fig. 2 is the A-A direction view in Fig. 1；

Fig. 3 is the B-B direction view in Fig. 1；

Fig. 4 is the acoustical behavior figure of the rear muffler of the prior art.

Fig. 5 is the acoustical behavior figure according to the rear muffler of Fig. 1 embodiment.

Specific embodiment

It is following to disclose the embodiment or embodiment of subject technology scheme described in a variety of different implementations.For simplification The specific example of each element and arrangement is described below in disclosure, and certainly, these are only example, is not to this The protection scope of utility model is limited.Such as the fisrt feature then recorded in the description above second feature or It is formed above, may include the embodiment that the first and second features are formed by way of directly contacting, also be included in The embodiment that supplementary features are formed between one and second feature, to can not directly be contacted between the first and second features. In addition, in these disclosures may in different examples repeat reference numerals and/or letter.The repetition is in order to brief With it is clear, itself do not indicate each embodiment being discussed and/or interstructural relationship.Further, when first element is It is described with the mode for being connected with second element or combining, which includes that the first and second elements are connected directly or are bonded to each other Embodiment, also include made using one or more other intervening elements additions the first and second interelements ground connection be connected or that This is combined.

In addition, it is necessary to understand, the noun of locality such as " front, rear, top, and bottom, left and right ", " laterally, vertical, vertical, horizontal " and Orientation or positional relationship indicated by " top, bottom " etc. is normally based on orientation or positional relationship shown in the drawings, merely to just In description the utility model and simplify description, in the absence of explanation to the contrary, these nouns of locality do not indicate that and imply institute The device or element of finger must have a particular orientation or be constructed and operated in a specific orientation, therefore should not be understood as to this The limitation of utility model protection range.Meanwhile the application has used particular words to describe embodiments herein.The noun of locality " inside and outside " refers to inside and outside the profile relative to each component itself, limits components using the words such as " first ", " second ", It is intended merely to facilitate and corresponding components is distinguished, there is no Stated otherwise such as, there is no particular meanings for above-mentioned word, therefore It can not be interpreted as the limitation to scope of protection of the utility model.Such as " one embodiment ", " embodiment ", and/or " some realities Apply example " mean a certain feature relevant at least one embodiment of the application, structure or feature.Therefore, it should be emphasized that and pay attention to It is " embodiment " or " one embodiment " or " the alternative reality referred to twice or repeatedly in this specification in different location Apply example " it is not necessarily meant to refer to the same embodiment.In addition, certain features, structure in one or more embodiments of the application or Feature can carry out combination appropriate.

In following embodiments, internal combustion engine exhaust system is by taking car combustion engine exhaust system as an example.

As shown in Figure 1, in one embodiment, the rear muffler of internal combustion engine exhaust system includes shell 1；Pipeline 2, including the One pipe shaft 21 and the first nozzle 22, the second nozzle 23 positioned at 21 both ends of the first pipe shaft, the first nozzle 22 are located at described second The upstream of nozzle 23, the first pipe shaft 21 offer an outlet hole section 24, and outlet hole section 24 is located at the downstream of the first nozzle 22；Partition 31 be AND DEWATERING FOR ORIFICE STRUCTURE；Outlet hole section 24 is provided with first partition 31 in corresponding association downstream, and first partition 31 is located at shell 1 Part downstream constitutes the resonant cavity 41 indicated such as dotted line frame.The beneficial effect of such setting is, using setting on pipe shaft It sets venthole and downstream is correspondingly arranged partition and shell forms the setting of resonant cavity, form Helmholtz in flow direction of exhaust gases Resonant cavity, enhances noise elimination effect, the hole area of venthole, can the revolving speed section of noise reduction according to specific needs be configured, Such as being if desired directed to low rotation speed area, i.e. the noise of low-frequency range is handled, then the hole area of venthole can be reduced, if needing It to be directed to high speed area, i.e. the short noise of high frequency is handled, then the hole area of venthole can suitably increase.

It continues to refer to figure 1, in one embodiment, the first pipe shaft 21 offers the first outlet hole section 24 and the second outlet hole section 25, the second outlet hole section 25 is located at the downstream of the first outlet hole section 24；Partition with AND DEWATERING FOR ORIFICE STRUCTURE include first partition 31, Second partition 32, first partition 31 will be divided into shell first part 11 and housing second portion 12 inside shell 1；Second partition 32 are located at housing second portion 12, and housing second portion 12 is separated into shell Part III 13 and shell Part IV 14；The One pipe shaft 21 passes through first partition 31 and second partition 32, and the first outlet hole section 24 is located at shell first part 11, shell the Two parts 12 are configured to and associated first resonant cavity 41 of the first outlet hole section；Second outlet hole section 25 is located at the third of shell Part 13, shell Part IV 14 are configured to and associated the second resonant cavity indicated such as dotted line frame of the second outlet hole section 25 42.Outlet hole section is associated with resonant cavity, for example, 24 outlet of the first outlet hole section and the noise that generates mainly is disappeared by the first resonant cavity 41 Sound, therefore the first outlet hole section 24 is associated with the first resonant cavity.The first venthole is respectively set in same pipe shaft upstream and downstream, second goes out Stomata can switch over processing for the noise of multiple rotary speed areas.Such as it needs not only to be directed to low rotation speed area noise, but also right When high speed area noise is handled, then the hole area positioned at the first outlet hole section 24 of upstream is small, and is located at the of downstream The hole area of two outlet hole sections 25 is big, and when internal combustion engine is located at slow-speed of revolution section, capacity is few, and most exhaust is upper from being located at 24 outlet of the first outlet hole section of trip, corresponding first resonant cavity 41 processing account for the low-frequency noise of noise major part at this time；And work as When internal combustion engine is located at high revolving speed section, capacity is larger, and most ventilation aperture area is located at greatly the second outlet hole section in downstream 25 outlets, corresponding second resonant cavity 42 processing account for the high-frequency noise of noise major part at this time, realize for low-frequency noise, high frequency The hand-off process of noise, so that silencer possesses wide deadening frequency band and high acoustical absorptivity simultaneously.Specifically, as shown in Figure 1, shell 1 shape can be cylindrical shell, including side wall 100 and close off the first end cover 101 and second end at side wall both ends Lid 102, using cylindrical shell, easy to process and arrangement internal duct, and the space layout easily with exhaust system and vehicle It is adapted.It is understood that shell 1 is not limited with column, it can also be using other hull shapes, such as spherical shape.

Continue to refer to figure 1, in one embodiment, the specific structure of rear muffler can be rear muffler further include third every Plate 33, the 4th partition 34 are also AND DEWATERING FOR ORIFICE STRUCTURE, and third partition 33, the 4th partition 34 are disposed adjacent, by shell first part 11 It is separated into shell Part V 15, shell Part VI 16 and shell Part VII 17；Pipeline 2 is air inlet pipe, rear muffler It further include intermediate tube 20, exhaust pipe 200；Air inlet pipe since it is located at the first nozzle 22 of shell 1, pass through the 4th partition 34, Third partition 33 and first partition 31, second partition 32 and the second resonant cavity 42 for terminating at 23 place of the second nozzle；Exhaust Pipe 200 includes the second pipe shaft 2001 and third nozzle 2002, the 4th nozzle 2003, and exhaust pipe 200 is by being located at the shell the The third nozzle 2002 of seven parts 17 starts, and passes through the 4th partition 34, third partition 33, first partition 31, second partition 32 simultaneously Terminate at the 4th nozzle 2003 of shell 1；Intermediate tube 20 is between air inlet pipe and exhaust pipe 200；Intermediate tube 20 includes Third pipe shaft 201 and the 5th nozzle 202, the 6th nozzle 203, intermediate tube 20 is by the 5th nozzle positioned at shell Part V 15 202 startings, pass through the 4th partition 34 and third partition 33, and terminate at shell Part VII 17；First pipe shaft 21, second pipe Body 2001 and third pipe shaft 201 are located at the part of shell Part VI 16, and bloop 26,2006 is distributed with respectively and (is located at the The bloop of three pipe shafts 201 is not shown), the rest of shell Part VI 16 is filled by noise reduction fiber 5.Using air inlet pipe, The after silencer of the Z-shaped structure of intermediate tube and exhaust pipe increases the noise reduction length in a limited space, can be abundant Carry out noise reduction.

With reference to Fig. 1 and comparison diagram 2, Fig. 3, in one embodiment, the hole area of first partition 31 is greater than second partition 32 Hole area, first partition 31 has several first partition holes 311 and a hundreds of lesser second partition holes 312, and second 32, partition have third partition board hole 321 similar in several and 311 area of first partition hole.The beneficial effect of such setting exists In, consider that the area of the second outlet hole section 25 is big, go out that throughput is big, therefore first partition 31 need to have bigger hole area, Exhaust could be made more rapidly to flow to intermediate tube 20 and exhaust pipe 200, to meet the requirement of exhaust back pressure.It is understood that The size of the specific number of perforations and hole of first partition 31 and second partition 32 can be required by different noise reductions and back pressure is wanted Selection is asked, is not limited with the size and number of Fig. 2 and specific hole shown in Fig. 3.

It continues to refer to figure 1, in one embodiment, the specific structure of the second pipe shaft 2001 can also be the second pipe shaft 2001 The second bloop 2007 is distributed in the part of the first resonant cavity 41 and the second resonant cavity 42, and outside the second bloop 2007 It encloses and is surrounded with high frequency sound attenuation assembly 2008, can be made of noise reduction fiber.It is understood that there may also be it for the second pipe shaft Its specific structure.Second bloop 2007 is set in the part of the first resonant cavity 41 and the second resonant cavity 42 and is wrapped around it Around high frequency sound attenuation assembly, the beneficial effect is that, it can further eliminate high-frequency noise.

Continue to refer to figure 1, in one embodiment, the first pipe shaft 21, the second pipe shaft 2001 and third pipe shaft 201 it is specific Structure can be three and respectively include the first straight pipe, the second straight pipe and third straight pipe, first straight pipe, second Axis L1, L2, L3 of straight pipe and third straight pipe are parallel, using straight tube formation gases flow velocity faster, and be easy to plus Work.It specifically, may include multiple straight tube segmentations 2009, multiple straight tube segmentations for the second straight pipe of the second pipe shaft 2001 2009 axis is parallel, and adjacent straight tube segmentation 2009 is connected by bend pipe 2010, and the pipe shaft structure of straight tube is connected using bend pipe, Noise elimination effect can be further enhanced.

With reference to shown in Fig. 4 and Fig. 5, using the rear muffler of such as Fig. 1 embodiment, it is located at for internal-combustion engine rotational speed The 2000rpm generated mainly noise of low frequency and revolving speed are located at the noise of the mainly high frequency of 3000rpm, noise reduction effect Fruit is more significant, for eight rank noises, reduces at least 5dB, noise reduction effect is obvious, it was demonstrated that Fig. 1 embodiment Rear muffler realize for specific rotation speeds region correspond to noise specific aim processing and different rotating speeds region correspond to noise Hand-off process eliminate the noise.Therefore, above-described embodiment can be applied to C217/T086-1.2TD silencer and hanging assembly after disappear in Cored structure project, and it is applied to A grades of Che Pingtai.

Although the utility model is disclosed as above with preferred embodiment, its be not for limiting the utility model, it is any Those skilled in the art without departing from the spirit and scope of the utility model, can make possible variation and modification.Cause This, all contents without departing from technical solutions of the utility model, according to the technical essence of the utility model to above embodiments institute Any modification, equivalent variations and the modification made, each fall within the protection scope that the utility model claims are defined.

Claims (10)

1. a kind of rear muffler, which is characterized in that including

Shell；

Pipeline, the first nozzle, the second nozzle including the first pipe shaft and positioned at first pipe shaft both ends, first nozzle Positioned at the upstream of second nozzle, first pipe shaft offers the first outlet hole section and the second outlet hole section, and described first Venthole section is located at the downstream of first nozzle, and the second venthole section is located at the downstream of the first outlet hole section；

First partition is AND DEWATERING FOR ORIFICE STRUCTURE, the enclosure interior is divided into shell first part and housing second portion；

Second partition is AND DEWATERING FOR ORIFICE STRUCTURE, is located at the housing second portion, the housing second portion is separated into shell third Part and shell Part IV；

First pipe shaft passes through the first partition and second partition, and the first venthole section is located at the shell first Part, the housing second portion are configured to and associated first resonant cavity of the first outlet hole section；

The second venthole section is located at the Part III of the shell, and the shell Part IV is configured to and described second Associated second resonant cavity of outlet hole section.

2. a kind of rear muffler as described in claim 1, which is characterized in that the hole area of the second outlet hole section is greater than institute State the hole area of the first outlet hole section.

3. rear muffler as claimed in claim 2, which is characterized in that the pipeline is air inlet pipe, and the silencer further includes

Third partition, the 4th partition, are AND DEWATERING FOR ORIFICE STRUCTURE, and the third partition, the 4th partition are disposed adjacent, by the shell A part is separated into shell Part V, shell Part VI and shell Part VII；And

Intermediate tube, exhaust pipe；The air inlet pipe passes through the 4th partition, third partition since it is located at the first nozzle of shell And first partition, second partition and terminate at the second resonant cavity where the second nozzle；

The exhaust pipe includes the second pipe shaft and third nozzle, the 4th nozzle, and the exhaust pipe is by being located at the shell the 7th Partial third nozzle starts, and across the 4th partition, third partition, first partition, second partition and terminates at shell 4th nozzle；

The intermediate tube is between the air inlet pipe and the exhaust pipe；The intermediate tube includes third pipe shaft and the 5th pipe Mouthful, the 6th nozzle, the intermediate tube originates by the 5th nozzle for being located at shell Part V, pass through the 4th partition and third every Plate, and terminate at the shell Part VII；Positioned at first pipe shaft of the shell Part VI, the second pipe shaft and Bloop is distributed in three pipe shafts respectively, and the rest of the shell Part VI is filled by noise reduction fiber.

4. rear muffler as claimed in claim 3, which is characterized in that the hole area of the first partition is greater than second partition Hole area.

5. rear muffler as claimed in claim 3, which is characterized in that second pipe shaft is located at the first resonant cavity and second The second bloop is distributed in the part of resonant cavity, and second bloop periphery is surrounded with high frequency sound attenuation assembly.

6. rear muffler as claimed in claim 3, which is characterized in that first pipe shaft, the second pipe shaft and third pipe shaft Respectively include the first straight pipe, the second straight pipe and third straight pipe, first straight pipe, the second straight pipe and third The axis of straight pipe is parallel.

7. rear muffler as claimed in claim 6, which is characterized in that second straight pipe includes multiple straight tube segmentations, institute The axis for stating straight tube segmentation is parallel, and adjacent straight tube segmentation is connected by bend pipe.

8. rear muffler as described in claim 1, which is characterized in that the shell be cylindrical shell, including side wall and point The first end cover and second end cover at other closed side wall both ends.

9. a kind of rear muffler, which is characterized in that including

Shell；

Pipeline, the first nozzle, the second nozzle including the first pipe shaft and positioned at first pipe shaft both ends, first nozzle Positioned at the upstream of second nozzle, first pipe shaft offers at least one outlet hole section, and the venthole section is located at institute State the downstream of the first nozzle；

At least one partition is AND DEWATERING FOR ORIFICE STRUCTURE；

Each outlet hole section of at least one outlet hole section is provided with a partition in corresponding be associated with downstream, and described one A partition constitutes resonant cavity with the part that the shell is located downstream.

10. a kind of internal combustion engine exhaust system, which is characterized in that including rear muffler as described in any one of claims 1-9.