CN207245818U - A kind of offgas duct - Google Patents
A kind of offgas duct Download PDFInfo
- Publication number
- CN207245818U CN207245818U CN201720978543.XU CN201720978543U CN207245818U CN 207245818 U CN207245818 U CN 207245818U CN 201720978543 U CN201720978543 U CN 201720978543U CN 207245818 U CN207245818 U CN 207245818U
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- China
- Prior art keywords
- tail gas
- offgas duct
- tube
- bellows
- straight tube
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Abstract
The utility model discloses a kind of offgas duct, including the tail gas straight tube and tail gas bellows being wholely set, the tail gas bellows are disposed on tail gas straight tube, and the tail gas straight tube is mono-layer tube, and the tail gas bellows is bimetallic tube.The offgas duct, can not only ensure heat dissipation effect, but also can realize curved elongated, to reach the installation length of requirement, the vibrations that can effectively prevent high-frequency impulse gas from producing, can especially prevent to resonate, and, it is very close to each other between the offgas duct, friction will not have been produced in use, has reduced vibrations stress, and also reduces the difficulty of processing of offgas duct, the weight of offgas duct is reduced, adds the service life of product.The manufacture method of the offgas duct, it is simple in structure, it is easy to operate.
Description
Technical field
The technical field of auto parts machinery is the utility model is related to, more specifically to a kind of offgas duct.
Background technology
With the continuous development of car industry, the requirement for the fluid pipe fitting, bellows part of automobile engine periphery arrangement
Also higher and higher, therefore, urgent need will design a kind of heat dissipation effect that should ensure these pipe fittings used in automobile, ensure this again
It is easily bent during a little pipe fitting uses, to reach installation length, meanwhile, also to ensure its use intensity, stress will not be produced
Damage, easy to process, light-weight, service life length.
Chinese patent literature（The day for announcing：On July 29th, 2015, notification number：CN104806386A）Disclose a kind of bilayer
Exhaust gas recirculation pipe, including recycling pipe fitting, the recycling pipe fitting by inner tube and antirust outer tube by metal injection into
Type technique is made, and the density of the density ratio antirust outer tube of inner tube is small, and the inlet end of the recycling pipe fitting is equipped with and exhaust
The flange I that system is connected, the outlet side for recycling pipe fitting are equipped with the flange II being connected with inlet manifold.
Above-mentioned technical proposal discloses kind of a double-deck exhaust gas recirculation pipe, but bilayer exhaust gas recirculation pipe manufacture is complicated,
And effect is undesirable, it is impossible to reduces stress damage, service life is short.
Chinese patent literature（The day for announcing：On September 25th, 2013,203214197 U of notification number CN）One kind is disclosed to start
Machine exhaust gas recirculation circuit attachment device, which disclose a kind of structure of engine exhaust gas reclrculation pipe, by being vented discrimination
Pipe, exhaust gas introduce pipe and the circulation isostructural combined innovation of air inlet, increase the heat dissipation area of pipeline, reduce outflow exhaust gas
Temperature, avoid damage of the thermal stress deformation to pipeline.
But the compliant section that the exhaust gas in above-mentioned technical proposal introduces pipe is longer, Oscillation Amplitude is big, and it is hidden both to have there is safety
Suffer from, also so that the problem of service life of exhaust gas introducing pipe is shorter.
Utility model content
The purpose of this utility model is complicated in order to solve automobile engine periphery fitting structure in the prior art, is made
Inconvenience, it is impossible to stress damage is effectively reduced, the problems such as service life is short, and a kind of heat dissipation effect that can either ensure pipe fitting is provided
Fruit, and be easily bent to reach installation length, at the same time, additionally it is possible to ensure its use intensity, stress damage, processing side will not be produced
Just, it is light-weight, the offgas duct of service life length.
Technical solution is used by the utility model realizes its first goal of the invention：A kind of offgas duct, including one
The tail gas straight tube and tail gas bellows of setting, the tail gas bellows are disposed on tail gas straight tube, and the tail gas is straight
It is bimetallic tube to manage as mono-layer tube, the tail gas bellows.The offgas duct, the tail gas ripple of bilayer is partially provided with tail gas straight tube
Line pipe, in use, the offgas duct and flanged joint, and by being arranged to two sections of double-deck tail gas ripples at two close end connecting flange
Line pipe, such structure can not only ensure heat dissipation effect, but also can realize curved elongated, to reach the installation length of requirement.Should
Offgas duct, changes the rigidity of bellows segment, so as to change the mode of pipeline, allows first-order modal and other modal frequencies to be lifted, makes
It is not easy to be energized, while also increases damping, vibration is inhibited.The offgas duct, can effectively prevent high-frequency impulse
The vibrations that gas produces, can especially prevent to resonate, moreover, it is very close to each other between the offgas duct, in use
Friction will not have been produced, has reduced vibrations stress, and has also reduced the difficulty of processing of offgas duct, has reduced the weight of offgas duct
Amount, adds the service life of product.
Preferably, the tail gas bellows includes corrugated outer tube and corrugated inner tube, the corrugated outer tube and ripple
The socket connection of inner tube gapless.By high-pressure molding, outer tube and inner tube after corrugated outer tube and the corrugated inner tube socket of the offgas duct
Between gapless, ensure that will not produce friction in use, reduce vibrations stress, add offgas duct use the longevity
Life.
Preferably, the tail gas bellows is high pressure one-pass molding component.Using high pressure one-pass molding so that inside and outside
It is very close to each other between pipe, it ensure that the stiffness and intensity of offgas duct, while will not also reduce the heat-conducting effect of offgas duct.
Preferably, the corrugated outer tube and corrugated inner tube are the thermal conductive metallic material pipe fitting that unlike material is formed.
Preferably, it is provided with one layer of protective layer in tail gas straight tube and tail gas ripple pipe outer wall.Set protective layer be in order to
Increase the service life of offgas duct, reduce external corrosion.
Preferably, it is provided with one layer of high temperature resistant cushion on tail gas straight tube and tail gas ripple inside pipe wall.High temperature resistant is set
Cushion, is to realize more preferable shock-absorbing function, further reduces vibrations stress.
The beneficial effects of the utility model are：The offgas duct, can not only ensure heat dissipation effect, but also can realize that bending is drawn
It is long, to reach the installation length of requirement, it can effectively prevent the vibrations of high-frequency impulse gas generation, can especially prevent
Resonance, moreover, it is very close to each other between the offgas duct, friction will not have been produced in use, reduce vibrations stress, and
The difficulty of processing of offgas duct is also reduced, reduces the weight of offgas duct, adds the service life of product.
Brief description of the drawings：
Fig. 1 is a kind of structure diagram of the utility model offgas duct；
Fig. 2 is enlarged drawing at A in Fig. 1；
Fig. 3 is a kind of processing structure diagram of the utility model offgas duct；
In figure：1st, tail gas straight tube, 2, tail gas bellows, 3, corrugated outer tube, 4, corrugated inner tube, 5, tail gas bellows stock material
Pipe, 6, mould, 7, corrugation grooves, 8, straight tube section die, 9, bellows piece mould, 10, protective layer, 11, high temperature resistant cushion.
Embodiment：
The technical solution of the utility model is described in further detail below by specific embodiment and with reference to attached drawing.
Embodiment 1：
In the embodiment shown in Fig. 1, Fig. 2, a kind of offgas duct, including the tail gas straight tube 1 and tail gas ripple being wholely set
Pipe 2, tail gas bellows 2 are disposed on tail gas straight tube 1, and tail gas straight tube 1 is mono-layer tube, and tail gas bellows 2 is bimetallic tube.
Tail gas bellows 2 includes corrugated outer tube 3 and corrugated inner tube 4, and corrugated outer tube 3 and 4 gapless of corrugated inner tube set are in succession
Connect.
Tail gas bellows 2 is high pressure one-pass molding component.Corrugated outer tube 3 and corrugated inner tube 4 are led for what unlike material was formed
Hot metallic material pipe fitting.
One layer of protective layer 10 is provided with 2 outer wall of tail gas straight tube 1 and tail gas bellows.
One layer of high temperature resistant cushion 11 is provided with 2 inner wall of tail gas straight tube 1 and tail gas bellows.
Corrugated outer tube 3 and corrugated inner tube 4 use high pressure one-pass molding.Corrugated outer tube 3 and corrugated inner tube 4 are unlike material
Pipe fitting.Corrugated outer tube 3 and corrugated inner tube 4 are thermal conductive metallic material pipe fitting.Tail gas straight tube 1 is copper pipe in the present embodiment, outside ripple
Pipe 3 is stainless steel tube.
A kind of manufacture method of offgas duct（See Fig. 3）, include the following steps：
Step 1：Tail gas straight tube 1 and tail gas bellows stock tubes of material 5 are made, wherein tail gas bellows stock tubes of material 5 is interior
Footpath is engaged with the outside diameter of tail gas straight tube 1, and the length of tail gas straight tube 1 is more than the length of tail gas bellows stock tubes of material 5；
Step 2：The position of the tail gas bellows 2 made as needed, tail gas bellows stock tubes of material 5 is set in
On tail gas straight tube 1；
Step 3：Dedicated processing mould 6 is made, mould 6 is internally provided with some corrugation grooves 7 for being used to be molded ripple；
Step 4：The tail gas straight tube 1 for being set with tail gas bellows stock tubes of material 5 in step 2 is placed in inside mould 6；
Step 5：High pressure water is squeezed into inside tail gas straight tube 1, the pipe fitting of two sections of suits is formed double-deck ripple at suit
Pipe, the pipe fitting without being set with outer tube is then individual layer straight tube, eventually forms and has been wholely set tail gas straight tube 1 and tail gas bellows 2
Offgas duct.
Tail gas straight tube 1 and tail gas bellows stock tubes of material 5 in step 1 are the thermal conductive metallic material pipe fitting of unlike material.
Mould 6 in step 3 includes straight tube section die 8 and bellows piece mould 9, the inner wall and tail gas of straight tube section die 8
The outer wall of straight tube 1 is engaged, and the groove depth of the corrugation grooves 7 of bellows piece mould 9 is 40~50 millimeters, the slot bottom of corrugation grooves 7
For semicircular arc slot bottom, 18~22 millimeters of the groove width of corrugation grooves 7, the spacing between adjacent two corrugation grooves 7 is 4~8 millimeters.
The pressure of high pressure water in step 5 is 200MPa~400MPa.
In the present embodiment, the groove depths of corrugation grooves 7 is 42 millimeters, and the slot bottoms of corrugation grooves 7 is semicircular arc slot bottom, semicircle
The radius of arc is 9 millimeters, 18 millimeters of the groove width of corrugation grooves 7, and the spacing between adjacent two corrugation grooves 7 is 4 millimeters.High pressure water
Pressure be 200Mpa.
Embodiment 2：
Technical solution in embodiment 2 and the technical solution in embodiment 1 are essentially identical, and difference is：Tail gas is straight
Pipe 1 is aluminum pipe, and corrugated outer tube 3 is anti-rust stainless steel pipe.The groove depth of corrugation grooves 7 is 50 millimeters, and the slot bottom of corrugation grooves 7 is half
Arc-shaped slot bottom, the radius of semi arch are 12 millimeters, 20 millimeters of the groove width of corrugation grooves 7, between adjacent two corrugation grooves 7 between
Away from for 8 millimeters.The pressure of high pressure water is 400Mpa.
Embodiment 3：
Technical solution in embodiment 3 and the technical solution in embodiment 1 are essentially identical, and difference is：Tail gas is straight
Pipe 1 is copper pipe, and corrugated outer tube 3 is antirust aluminum pipe.The groove depth of corrugation grooves 7 is 45 millimeters, and the slot bottom of corrugation grooves 7 is semi arch
Shape slot bottom, the radius of semi arch is 10 millimeters, 22 millimeters of the groove width of corrugation grooves 7, and the spacing between adjacent two corrugation grooves 7 is
6 millimeters.The pressure of high pressure water is 300Mpa.
The process of offgas duct in above-described embodiment is such, by tail gas straight tube 1 and tail gas bellows stock material
Two layers of the pipe of pipe 5 is nested together, and places it in inside mould 6, and high pressure water, such pipe are squeezed into inside tail gas straight tube 1
Just it is shaped to the offgas duct of the ripple bellows of local double layer.
The automobile tail gas pipe, both ends connecting flange, ensure that the heat dissipation effect near flange, and bending easy to implement, with
Reach the length of installation requirement.Importantly, high-pressure molding of the offgas duct so that it is very close to each other between inner and outer pipes, protect
The stiffness and intensity of offgas duct have been demonstrate,proved, heat-conducting effect will not be reduced.Since vehicle exhaust is high-frequency impulse gas, pipeline is easy to
Produce vibrations, it is especially desirable to prevent to resonate, if whole offgas duct is both configured to bilayer, since inner and outer pipes are two kinds different
What material manufacture formed, two layers of pipe of straight pipe can produce gap between them, so due to processing and the difference of material parameter
Friction is just had between inner and outer pipes, bellows segment is different with the part vibration frequency of straight tube, it is easy to produces stress damage；And adopt
The structure of this local double layer bellows of the application is taken, changes the rigidity of bellows segment, so as to change the mode of pipeline, allows one
Rank mode and other modal frequencies are lifted, and make it be not easy to be energized, while also increase damping, vibration is inhibited.Drop
Low difficulty of processing, reduces the weight of offgas duct, reduces vibrations stress, add the service life of product.
Claims (4)
- A kind of 1. offgas duct, it is characterised in that：Including the tail gas straight tube being wholely set（1）With tail gas bellows（2）, the tail Gas bellows（2）It is disposed on tail gas straight tube（1）On, the tail gas straight tube（1）For mono-layer tube, the tail gas bellows （2）For bimetallic tube；The tail gas bellows（2）Including corrugated outer tube（3）And corrugated inner tube（4）, the corrugated outer tube（3） And corrugated inner tube（4）Gapless socket connection；Tail gas straight tube（1）With tail gas bellows（2）One layer of high temperature resistant is provided with inner wall Cushion（11）.
- A kind of 2. offgas duct according to claim 1, it is characterised in that：The tail gas bellows（2）For high pressure once Shaped component.
- A kind of 3. offgas duct according to claim 1, it is characterised in that：The corrugated outer tube（3）And corrugated inner tube（4） The thermal conductive metallic material pipe fitting formed for unlike material.
- 4. according to a kind of offgas duct described in claim 1 or 2 or 3, it is characterised in that：Tail gas straight tube（1）With tail gas bellows （2）One layer of protective layer is provided with outer wall（10）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720978543.XU CN207245818U (en) | 2017-08-07 | 2017-08-07 | A kind of offgas duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720978543.XU CN207245818U (en) | 2017-08-07 | 2017-08-07 | A kind of offgas duct |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207245818U true CN207245818U (en) | 2018-04-17 |
Family
ID=61879737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720978543.XU Active CN207245818U (en) | 2017-08-07 | 2017-08-07 | A kind of offgas duct |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207245818U (en) |
-
2017
- 2017-08-07 CN CN201720978543.XU patent/CN207245818U/en active Active
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