CN201461145U - Pipe for exhaust gas recirculation system - Google Patents
Pipe for exhaust gas recirculation system Download PDFInfo
- Publication number
- CN201461145U CN201461145U CN2009200161065U CN200920016106U CN201461145U CN 201461145 U CN201461145 U CN 201461145U CN 2009200161065 U CN2009200161065 U CN 2009200161065U CN 200920016106 U CN200920016106 U CN 200920016106U CN 201461145 U CN201461145 U CN 201461145U
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- CN
- China
- Prior art keywords
- pipe
- coupling device
- gas recirculation
- recirculation system
- egr
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The utility model discloses a pipe for an exhaust gas recirculation system, which solves the problems that the pipe for the exhaust gas recirculation system of the conventional diesel engine has small compensation amount, low elasticity and easy un-stability. The pipe for the exhaust gas recirculation system comprises a flange, a connecting pipe and a coupling reducer, wherein the coupling reducer is connected with the connecting pipe or the flange. The pipe is characterized in that single waveform section of the coupling reducer is between S shape and omega shape so as to increase the elasticity and improve the compensation capacity; and the coupling reducer is multilayer, and the number of the layers is 2 to 4 so as to reduce the rigidity. The pipe for the exhaust gas recirculation system has the advantages of increasing the elasticity of the coupling reducer, improving the compensation capacity and reducing the rigidity; compared with the conventional EGR pipe, the elasticity of the coupling reducer is improved by more than 20 percent, and the compensation capacity is improved by more than 20 percent, so the coupling reducer can fully absorb the displacement compensation brought by temperature change, absorbs the vibration of the system and plays a role in vibration absorption and noise reduction; and meanwhile, the pipe has stronger high temperature, high pressure and corrosion resistance and better stability, and the service life of the pipe is improved by over 10 times.
Description
Technical field
The utility model belongs to a kind of elastic connecting pipe, and particularly a kind of gas recirculation system of diesel engine that is used for is with managing.
Background technique
At present, the motor of automobile industry application is mainly petrol engine and diesel engine.Be subjected to energy crisis influence and the country to improving constantly that motor vehicle emission requires; diesel engine is liked by increasing motor enterprise with advantages such as its low energy consumption, low emission, low noise, high power, high moment of torsion, long-life, fuel economy dominate on motor car engine market progressively.
But diesel engine self also has some defectives, and as the oxynitrides that perfect combustion produces, black smoke that partial combustion forms and particulate matter etc. have restricted using and developing of diesel engine equally.Oxynitrides is discharged in the air, greenhouse effect are exerted an influence, and black smoke and particulate matter can pollute air.Country's Abgasgesetz has proposed clear and definite requirement to above-mentioned effulent, and more and more stricter.
EGR (Exhaust Gas Recirculation is called for short EGR) technology is that EGR Technology is one of technology that effectively addresses the above problem.Egr system mainly comprises EGR valve, cooler for recycled exhaust gas, EGR suction tude, EGR outlet pipe etc.The EGR technology is exactly that part waste gas with engine combustion flows back to gas handling system through the EGR pipeline, mixes the back with incoming mixture and participates in burning.Because the concentration of oxygen in the incoming mixture has been diluted in the introducing of waste gas, contain inert gas in the waste gas simultaneously, make the velocity of combustion of diesel engine reduce, heat radiation when having increased burning has reduced maximum combustion temperature, thereby has effectively reduced the discharging of oxynitrides; Along with the increase that EGR leads, the discharging of oxynitrides descends significantly, and its discharge amount can reduce 50%.
For satisfying the environmental regulation of increasingly stringent, domestic how tame big-block engine manufacturer has adopted EGR Technology to reduce the discharging of oxynitrides.Wherein, the gas recirculation system pipe is the important connected element of this system, because whole system is in the environment of high temperature Gao Zhen, therefore, requires EGR suction tude and outlet pipe to have the function that absorbs high temperature displacement distortion, vibration damping, noise abatement.
The EGR suction tude and the outlet pipe of present domestic design, processing are commonly single layer structure, are called expansion joint or bellows usually.The single waveform section of this bellows is a U-shaped, and whole bellows is connected and composed by a plurality of channel sections.This EGR manages the subject matter that exists, and compensation rate is little, and intensity is relatively poor, if by increasing the intensity that pipe thickness improves the EGR pipe, will certainly cause the rigidity of EGR pipe to increase, and rigidity increase in a single day, heat compensation amount will reduce.In addition, also there are problems such as little, the easy unstability of elasticity, working life be short in the EGR pipe of using the U-shaped bellows.
Summary of the invention
The technical problems to be solved in the utility model is, overcome that the existing diesel engine exhaust-gas recirculating system is little with the compensation rate that pipe exists, elasticity is little, the problem of easy unstability, provide that a kind of elasticity is big, compensation ability is high, be difficult for unstability, the gas recirculation system of long service life is with pipe.
The utility model comprises flange, connecting tube and subtracts the coupling device, subtracts the coupling device and is connected with connecting tube or flange, and its special way is that the described single waveform section that subtracts the coupling device to increase elasticity, improves compensation ability between S shape and Ω shape.
The described coupling device that subtracts is a multilayer, and its number of plies is 2～4 layers, to reduce rigidity.
The described wave number that subtracts the coupling device is 3～15, to adapt to different connection requests.
The described coupling device that subtracts is connected with flange by connecting tube, perhaps directly is connected with flange, to adapt to different egr system environmental requirement and connection request.
Subtract between coupling device and the connecting tube by subtract coupling device enlarging straightway or straightway or reducing straightway with the connecting tube location, be connected, and satisfy requirement of strength by welding.
Advantage of the present utility model is:
1, the utility model subtracts the waveform section of coupling device employing between S shape and Ω shape, and its number of plies is 2～4 layers, both increased the elasticity that subtracts the coupling device, improved compensation ability, reduced rigidity again, compare with existing EGR pipe, its elasticity improves more than 20%, and compensation rate improves more than 20%, can absorb the bit shift compensation that brings owing to temperature variation fully, and absorbed the vibration of system, play the effect of vibration damping, noise abatement, simultaneously, high temperature high voltage resistant of the present utility model, corrosion resistance are stronger, stability is also better, improves working life more than ten times.
2, subtract the coupling device and adopt waveform section between S shape and Ω shape, and for the multi-layer thin wall construction, make the pliability enhancing of EGR pipe, under the effect of the power below the 50N, can realize the forms of motion such as stretching, compression or bending of EGR pipe, install very convenient.
3, Applicable scope is wide, both can be used as the EGR suction tude and has used, and also can be used as the EGR outlet pipe and uses, and simultaneously, the utility model also can be used as the pressurized machine return tube and water pipe uses.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the A portion enlarged view of Fig. 1;
Fig. 3, Fig. 5 are the structural representations of other embodiments of the utility model;
Fig. 4 is the B portion enlarged view of Fig. 3;
Fig. 6 is the C portion enlarged view of Fig. 5;
Fig. 7 is the graph of stretch performance of the utility model EGR pipe;
Fig. 8 is the graph of stretch performance of existing EGR pipe;
Fig. 9 is the bending properties figure of the utility model EGR pipe;
Figure 10 is the bending properties figure of existing EGR pipe.
Embodiment
Embodiment 1:
As depicted in figs. 1 and 2, the utility model comprises flange 1, flange 5, connecting tube 2, connecting tube 4 and subtracts coupling device 3, subtracts coupling device 3 and is connected with flange 1,5 by connecting tube 2,4; The described external diameter that subtracts coupling device 3 is between 10-50mm, and single waveform section to increase elasticity, improves compensation ability between S shape and Ω shape; The described coupling device 3 that subtracts is 2 layers, and the wall thickness of mono-layer tube is between 0.1-0.3mm, to reduce rigidity, improve intensity, during application, can increase the number of plies that subtracts coupling device 3 as required, but should not surpass 4 layers at most, the meeting above 4 layers increases considerably difficulty of processing and cost of production; In the present embodiment, the wave number that subtracts coupling device 3 is 8, can increase and decrease as required during actual the use, adapting to the requirement of different heat compensation amounts, but minimumly should not be less than 3, at most should not be more than 15; Subtract coupling device 3 and select resistant to elevated temperatures stainless steel material for use, when high-temp waste gas is managed through EGR, subtracting coupling device 3 can absorb owing to the caused displacement variable of high temperature, compensation rate is greater than 3.5mm, reduce EGR and managed suffered stress, simultaneously, absorbed the vibration of motor, and reduced noise, improved the working life of EGR pipe; The described two ends that subtract coupling device 3 have an enlarging straightway 31,32 respectively, an enlarging straightway 21,41 is arranged respectively on connecting tube 2,4, subtract between coupling device 3 and the connecting tube 2,4 and in the enlarging straightway 21,41 of connecting tube 2,4, locate by subtracting coupling device enlarging straightway 31,32, and be connected with the enlarging straightway 21,41 of connecting tube 2,4, the enlarging straightway 21,41 of connecting tube 2,4 will subtract coupling device enlarging straightway 31,32 and wrap up, and improve join strength by welding manner; Mode by welding between the other end of connecting tube 2,4 and the flange 1,5 is connected, and satisfies requirement of strength.
Embodiment 2:
As shown in Figure 3 and Figure 4, its structure such as embodiment 1, difference is, subtracting coupling device 6 is 3 layers, the wave number that subtracts coupling device 6 is 5, can compensate the above displacement of 2mm, an end that subtracts coupling device 6 is connected with connecting tube 2, subtract between coupling device 6 and the connecting tube 2 and in the enlarging straightway 21 of connecting tube 2, locate by subtracting coupling device straightway 61, and be connected with the enlarging straightway 21 of connecting tube 2, the enlarging straightway 21 of connecting tube 2 will subtract coupling device straightway 61 and wrap up, and improve join strength by welding manner; The other end that subtracts coupling device 6 directly is connected with flange 5, to adapt to different connection requests, in the overlap joint side of flange 5, subtracts coupling device 6 and need not enlarging, and Placement is come proof strength by welding equally.
Embodiment 3:
As shown in Figure 5 and Figure 6, its structure such as embodiment 2, difference is, subtracting coupling device 8 is 2 layers, the ripple number that subtracts coupling device 8 is 7, can compensate the above displacement of 3mm, a described end that subtracts coupling device 8 directly is connected with flange 5, the other end is connected with connecting tube 7, the other end of connecting tube 7 is connected with connecting tube 9, subtracts between coupling device 8 and the connecting tube 7 to locate in the enlarging straightway 71 of connecting tube 7 by subtracting coupling device reducing straightway 81, and is connected with the enlarging straightway 71 of connecting tube 7, the enlarging straightway 71 of connecting tube 7 will subtract coupling device reducing straightway 81 and wrap up, and improve join strength by welding manner; All by enlarging straightway location be connected, the other end of connecting tube 9 is connected with flange 1, to adapt to different egr system environmental requirement and connection request between connecting tube 7 and the connecting tube 9.
The tensile property of the utility model EGR pipe as shown in Figure 7, as can be seen from Figure 7 the mechanical property of the utility model EGR pipe is very good, the elongation displacement is when being 5mm, maximum stretching force only is 238N; And in Fig. 8, when the existing elongation displacement that subtracts coupling device EGR pipe was 5mm, maximum stretching force was 460N, is 1.93 times of the present utility model.
The bending properties of the utility model EGR pipe as shown in Figure 9, when as can be seen from Figure 9 the elongation displacement of the utility model EGR pipe was 5mm, maximum deflection load was 42N only; And in Figure 10, when the existing elongation displacement that subtracts coupling device EGR pipe was 5mm, maximum deflection load was 68N, is 1.62 times of the present utility model.
Can it is evident that by above-mentioned two performance curves contrast, adopt EGR pipe of the present utility model to compare with the existing EGR pipe that subtracts the coupling device, mechanical property excellence, elasticity are better, compensation rate is bigger, in addition, owing to adopt the stainless steel of high-quality, make the EGR pipe have function corrosion-resistant, high temperature resistance Gao Zhen, satisfied the usage requirement of egr system rugged environment.
In gas recirculation system, link to each other with cooler for recycled exhaust gas and the pipeline that is positioned at before the cooler for recycled exhaust gas circulation is called the EGR suction tude, that is to say that waste gas enters cooler for recycled exhaust gas from the EGR suction tude; Link to each other with cooler for recycled exhaust gas, the pipeline that is positioned at the cooler back is called the EGR outlet pipe, that is to say that waste gas enters the EGR outlet pipe from cooler for recycled exhaust gas; If do not use cooler for recycled exhaust gas in the egr system, still need to use the EGR air inlet and exhaust piper, be positioned at the pipeline that pipeline before the EGR valve is called after EGR suction tude, the EGR valve this moment and be called the EGR outlet pipe, the two is referred to as the EGR pipe; The utility model both can be used as the EGR suction tude and had used, and also can be used as the EGR outlet pipe and used, and simultaneously, the utility model also can be used as the pressurized machine return tube and water pipe uses.
Claims (5)
1. a gas recirculation system is with managing, and it comprises flange, connecting tube and subtracts the coupling device, subtracts the coupling device and is connected with connecting tube or flange, it is characterized in that, the described single waveform section of coupling device that subtracts is between S shape and Ω shape.
2. gas recirculation system according to claim 1 is characterized in that with pipe the described coupling device that subtracts is a multilayer, and its number of plies is 2～4 layers.
3. gas recirculation system according to claim 1 is characterized in that with pipe the described wave number that subtracts the coupling device is 3～15.
4. gas recirculation system according to claim 1 is characterized in that with pipe the described coupling device that subtracts is connected with flange by connecting tube, perhaps directly is connected with flange.
5. gas recirculation system according to claim 1 is characterized in that with pipe, subtracts between coupling device and the connecting tube to locate, be connected with connecting tube by subtracting coupling device enlarging straightway or straightway or reducing straightway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200161065U CN201461145U (en) | 2009-08-01 | 2009-08-01 | Pipe for exhaust gas recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200161065U CN201461145U (en) | 2009-08-01 | 2009-08-01 | Pipe for exhaust gas recirculation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201461145U true CN201461145U (en) | 2010-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200161065U Expired - Lifetime CN201461145U (en) | 2009-08-01 | 2009-08-01 | Pipe for exhaust gas recirculation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201461145U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536444A (en) * | 2012-02-07 | 2012-07-04 | 上海交通大学 | Exhaust recirculation system with elastic component |
| CN106401806A (en) * | 2016-11-30 | 2017-02-15 | 安徽江淮汽车集团股份有限公司 | EGR flow guiding pipe structure |
-
2009
- 2009-08-01 CN CN2009200161065U patent/CN201461145U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102536444A (en) * | 2012-02-07 | 2012-07-04 | 上海交通大学 | Exhaust recirculation system with elastic component |
| CN106401806A (en) * | 2016-11-30 | 2017-02-15 | 安徽江淮汽车集团股份有限公司 | EGR flow guiding pipe structure |
| CN106401806B (en) * | 2016-11-30 | 2018-09-25 | 安徽江淮汽车集团股份有限公司 | A kind of EGR draft tube structures |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100512 |
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| CX01 | Expiry of patent term |