CN2861506Y

CN2861506Y - Inlet pipe for vehicle exhaustion and front exhaust pipe containing such

Info

Publication number: CN2861506Y
Application number: CNU2005201422187U
Authority: CN
Inventors: 余向阳
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2005-11-30
Filing date: 2005-11-30
Publication date: 2007-01-24
Anticipated expiration: 2015-11-30

Abstract

Disclosed is an inlet pipe of the front pipe for automobile exhaust pipe and front exhaust pipe containing the inlet pipe, which consists of an inner pipe, a chip-type mesh, a sound-absorbing layer and an outer pipe. The inner pipe is provided with a plurality of through-holes, chip, network coverage of the external surface, sound-absorbing layer chip in with the outside of the mesh tube between. The front pipe for automobile exhaust pipe provided by the utility model also includes the front flange, inlet pipe, catalytic purifier, outlet pipe and/or the back flange, which are connected and fixed in order in accordance with the front and back location said above. Wherein, said inlet pipe is provided by the utility model as the inlet pipe of the front pipe for automobile exhaust pipe. The front pipe for automobile exhaust pipe of the utility model can effectively guarantee the temperature of gas emission of automobile engine, and improve the emission effect when automobile cold-starts, and meanwhile reduce the high-frequency noise from automobile exhaust system, and reduce the silencer pressure on the rear exhaust system and save costs.

Description

Before the automobile exhaust inlet duct of pipe and contain the exhaust of this inlet duct before pipe

Technical field

The utility model is about a kind of outlet pipe, manages about the inlet duct of pipe before a kind of automobile exhaust and before containing the exhaust of this inlet duct specifically.

Background technique

Along with developing of automobile industry, automobile exhaust pollution has become the primary pollution source in the city, and national governments begin to formulate more strict emission control standards rules to this, and therefore, it is extremely urgent to solve the automobile exhaust pollution problem effectively.

At present, solve the motor vehicle exhaust emission problem and generally adopt two kinds of emission controls by improving combustion and external purifications.For external purification, adopt catalytic cleaner that tail gas is administered usually.Because the catalyzer light-off temperature of catalytic cleaner is generally at 250～350 ℃, it is to heat by the exhaust of motor to come stimulating activity.And in actual tests work, greatly the pollutant of part all is to begin in engine start, does not just discharge when promptly catalyzer also reaches light-off temperature, therefore, improves catalytic cleaner and just becomes the key that satisfies emission standard at the transformation efficiency of cold-start phase.

Improving catalytic cleaner mainly contains in the method for cold-start phase transformation efficiency: the low temperature that 1, improves catalyzer plays active energy; 2, improve the thermal capacity of catalytic cleaner; 3, heatable catalytic purifier; 4, near enmgine exhaust, install the one-level catalytic cleaner additional, realize two-stage and even multistage catalysis; 5, employing is provided with thermal baffle on catalyst converter inlet duct surface.For first three methods, all exist complex structure, the cost height, the shortcoming of poor reliability, and comparatively general for the 4th kind of method use, but some vehicle, do not had enough spaces to install the first class purification device additional near enmgine exhaust, therefore, the application of this method is restricted.For the 5th kind of method, adopt and be provided with thermal baffle on catalyst converter inlet duct surface, this heat insulation effect is also undesirable.

In automobile exhaust system, also need to reduce exhaust noise.Exhaust noise is the result by multiple combined factors, and it has the frequency band broad, based on the characteristics of medium and low frequency.Present automobile exhaust system adopts multistage baffler to eliminate the noise of different frequency bands usually, as the resistive baffler of one-level, eliminates the medium-high frequency noise; One-level resistant noise-reducing device is eliminated the medium and low frequency noise.Be accompanied by developing of automobile industry, the parts of car bottom plate below are more and more, and become increasingly complex, and are also more and more limited for the space that baffler is installed, and often need certain baffler installing space and will reach certain erasure effect.

The model utility content

The purpose of this utility model is to overcome pipe before the existing automobile exhaust can not guarantee the temperature of motor car engine exhausting air effectively and be difficult to by the space mounting position limit shortcoming that necessary muffling device is installed, provide a kind of new temperature that can guarantee the motor car engine exhausting air effectively, pipe before reducing the inlet duct of pipe before the automobile exhaust of the high frequency noise in the automobile exhaust system again and containing the exhaust of this inlet duct.

The inlet duct of pipe comprises interior pipe, chip reticulated work, sound-absorption layer and outer tube before the automobile exhaust that the utility model provides, and has a plurality of through holes on the interior pipe, and the chip reticulated work covers on the inner tube outer surface, and sound-absorption layer is between chip reticulated work and outer tube.

Pipe before the exhaust of the automobile exhaust system that the utility model provides, pipe comprises inlet duct before this exhaust, the inlet duct of pipe before the automobile exhaust that described inlet duct provides for the utility model.

Adopt the preceding pipe of exhaust of automobile exhaust system of the present utility model, can guarantee the temperature of motor car engine exhausting air effectively, emission effect when improving automobile cold start, can reduce simultaneously the high frequency noise in the automobile exhaust system again, alleviate the noise reduction pressure of vent systems rear portion baffler, saved cost.

Description of drawings

Accompanying drawing 1 is the composition structural representation of pipe before the utility model exhaust;

Accompanying drawing 2 is that each layer position concerns schematic representation in the utility model forward flange and the inlet duct;

Accompanying drawing 3 is the schematic representation of pipe in the utility model inlet duct;

Accompanying drawing 4 is the utility model inlet duct outlet end structural representation;

In the drawings: the 1-forward flange; The 2-inlet duct; The 3-catalytic cleaner; The 4-outer pipe; The 5-rear flange; Pipe in the 6-; 7-chip reticulated work; The 8-sound-absorption layer; The 9-reticulated work; The 10-outer tube.

Embodiment

Below in conjunction with accompanying drawing mode of execution of the present utility model is elaborated.

As shown in Figure 1, pipe 6, chip reticulated work 7, sound-absorption layer 8 and outer tube 10 in the inlet duct of pipe comprises before the automobile exhaust that the utility model provides, have a plurality of through holes 11 on the interior pipe 6, on pipe 6 outer surfaces, sound-absorption layer 8 was between chip reticulated work 7 and outer tube 10 in chip reticulated work 7 covered.

The chip reticulated work 7 of described inlet duct and the total thickness of sound-absorption layer 8 are the 10-15 millimeter.

As Fig. 2, shown in Figure 3, the interior pipe 6 of the inlet duct of pipe can be normally used various pipe before the utility model automobile exhaust, under the preferable case, the entry end of this inlet duct 2, pipe 6 stretches out outer tube 10 in the part, the entry end of interior pipe 6 can be enlarging 12, the part of the part of enlarging 12 outer surfaces and outer tube 10 internal surfaces is fitted, enlarging 12 is the mezzanine spaces that are used to seal interior pipe 6 and outer tube 10 entry ends, a plurality of through holes 11 are positioned on pipe 6 outer surfaces, through hole 11 is the propagation ducts of noise, and the diameter of through hole 11 is generally the 2-4 millimeter, and the spacing between the through hole 11 is the 5-8 millimeter.

The inlet duct of pipe can also comprise reticulated work 9 before the automobile exhaust that the utility model provides, and reticulated work 9 is positioned at the outlet end of inlet duct, and the structure of the outlet end of inlet duct is interior pipe 6, outer tube 10 and the reticulated work 9 between interior pipe 6 and outer tube 10.

As shown in Figure 4, the outer tube 10 of the inlet duct of pipe can be normally used various pipe before the automobile exhaust of the present utility model, under the preferable case, wherein, near the outlet end of described outer tube 10 enlarging 13 can be arranged, and reticulated work 9 is arranged in enlarging 13.The effect of enlarging 13 is that reticulated work 9 is fixed in the enlarging 13, reticulated work 9 is the catalytic cleaners 3 that are used for preventing to be entered into by the fibre object that air-flow is peeled off exhaust gas flow, pipe 6 flushes with outer tube 10 outlet end ports in described, and outer tube 10 outlet end ports are fixedlyed connected with catalytic cleaner 3.

Interior pipe 6, chip reticulated work 7, reticulated work 9 and the outer tube 10 of the inlet duct of pipe are metallic article before the utility model automobile exhaust, under the preferable case, are stainless steel; Described sound-absorption layer 8 is a lamination coating, under the preferable case, is glass fibre.

Pipe before the exhaust of the automobile exhaust system that the utility model provides, pipe comprises inlet duct 2 before this exhaust, the inlet duct of pipe before the automobile exhaust that described inlet duct 2 provides for the utility model.

Pipe can also comprise catalytic cleaner 3 before the described exhaust, and outer tube 10 outlet end of inlet duct 2 are fixedlyed connected with the entry end of catalytic cleaner 3.

Pipe can also comprise outer pipe 4 before the described exhaust, and the entry end of outer pipe 4 is fixedlyed connected with the outlet end of catalytic cleaner 3.

Pipe can also comprise forward flange 1 and/or rear flange 5 before the described exhaust, the internal surface of forward flange 1 interface end and the enlarging 12 of inlet duct 2 are stretched out the outer surface of outer tube 10 parts and are fitted, the interface end end face of forward flange 1 and the entry end end face of inlet duct outer tube 10 fit, forward flange 1 is connected to one with enlarging 12 and outer tube 10, and rear flange 5 is fixedlyed connected with the outlet end of outer pipe 4.

Described fixedly connected mode is as well known to those skilled in the art, as welding, bonding or riveted joint, under the preferable case, adopts welding.

Pipe before adopting the inlet duct of pipe before the automobile exhaust of the present utility model and containing the exhaust of this inlet duct, after engine start, vehicle exhaust enters from gas exhaust manifold and manages 6 in the inlet duct, because sound-absorption layer 8 can be eliminated the medium-high frequency noise in the air-flow, simultaneously can also reduce the heat dissipating capacity of air-flow to the external world, play heat insulation effect, make the heat distribution loss of tail gas very little, thereby can allow the catalyzer in the catalytic cleaner 3 play work as early as possible, reach the purpose of improving the cold start emission quality, meanwhile, the noise that produces also imports the mezzanine space of interior pipe 6 and outer tube 10 into by through hole 11, when the sound wave of noise entered into the space at sound-absorption layer 8 places, acoustic energy will be absorbed by the lamination coating of sound-absorption layer 8 and be transformed into heat energy, thereby reaches the effect of noise reduction.Because the air-flow of pipe 6 and outer tube 10 interlayers in entering into, may peel off some fiber, chip reticulated work 7 and reticulated work 9 play the effect of isolating fiber thus, those fibers of being peeled off by air-flow just can not enter into the passage and the catalytic cleaner 3 of exhaust gas flow, thereby can not form obstruction to catalyst carrier and whole vent systems yet.

The inlet tube of pipe and contain the exhaust front pipe of this inlet tube before the automobile exhaust of the present utility model can Effectively guarantee the temperature of Engine Exhaust Emission gas, the emission effect when improving automobile cold start, with The time can reduce again high frequency noise in the automobile exhaust system, the noise reduction that alleviates gas extraction system rear portion muffler is pressed Power has been saved cost.

Claims

1, the inlet duct of pipe before a kind of automobile exhaust, it is characterized in that, described inlet duct comprises interior pipe (6), chip reticulated work (7), sound-absorption layer (8) and outer tube (10), have a plurality of through holes (11) on the interior pipe (6), chip reticulated work (7) covers on interior pipe (6) outer surface, and sound-absorption layer (8) is positioned between chip reticulated work (7) and the outer tube (10).

2, inlet duct according to claim 1, wherein described, the chip reticulated work (7) of inlet duct (2) and the total thickness of sound-absorption layer (8) are the 10-15 millimeter.

3, inlet duct according to claim 1, wherein, at the entry end of described inlet duct, pipe (6) stretches out outer tube (10) in the part.

4, inlet duct according to claim 1, wherein, the diameter of described through hole (11) is the 2-4 millimeter, the spacing between the through hole (11) is the 5-8 millimeter.

5, inlet duct according to claim 1, wherein, this inlet duct also comprises reticulated work (9), and reticulated work (9) is positioned at the outlet end of inlet duct, the structure of the outlet end of inlet duct be interior pipe (6), outer tube (10) and be positioned at pipe (6) and outer tube (10) between reticulated work (9).

6, inlet duct according to claim 1 or 5 wherein, has enlarging (13) near described outer tube (10) outlet end, and reticulated work (9) is arranged in enlarging (13).

7, pipe before a kind of exhaust of automobile exhaust system, pipe comprises inlet duct (2) before the exhaust of this automobile exhaust system, wherein, described inlet duct (2) is any described inlet duct among the claim 1-6.

8, pipe before the exhaust according to claim 7, wherein, pipe also comprises catalytic cleaner (3) before this exhaust, outer tube (10) outlet end of inlet duct (2) is fixedlyed connected with the entry end of catalytic cleaner (3).

9, pipe before the exhaust according to claim 8, wherein, pipe also comprises outer pipe (4) before this exhaust, the entry end of outer pipe (4) is fixedlyed connected with the outlet end of catalytic cleaner (3).

10, pipe before the exhaust according to claim 9, wherein, pipe also comprises forward flange (1) and/or rear flange (5) before this exhaust, and forward flange 1 is fixedlyed connected with the entry end of inlet duct 2, and rear flange 5 is fixedlyed connected with the outlet end of outer pipe (4).

11, pipe before the exhaust according to claim 10, wherein, the entry end of pipe (6) partly stretches out outer tube (10) in described, this entry end is enlarging (12), the part of the part of enlarging (12) outer surface and outer tube (10) internal surface is fitted, the outer surface of outer tube (10) part is stretched out in enlarging (12) and the internal surface of forward flange (1) interface end is fitted, and the entry end end face of the interface end end face of forward flange (1) and inlet duct outer tube (10) fits.

12, according to managing before claim 10 or the 11 described exhausts, wherein, forward flange (1) is structure as a whole with enlarging (12) and outer tube (10).