CN105604747A - Vibration fracture preventive EGR (exhaust gas recirculation) corrugated pipe - Google Patents
Vibration fracture preventive EGR (exhaust gas recirculation) corrugated pipe Download PDFInfo
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- CN105604747A CN105604747A CN201610132393.0A CN201610132393A CN105604747A CN 105604747 A CN105604747 A CN 105604747A CN 201610132393 A CN201610132393 A CN 201610132393A CN 105604747 A CN105604747 A CN 105604747A
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Abstract
The invention discloses a vibration fracture preventive EGR (exhaust gas recirculation) corrugated pipe which comprises mounting flanges, a first hard pipe and a flexible corrugated pipe. The mounting flanges are arranged at two ends of the vibration fracture preventive EGR corrugated pipe in pairs; one end of the first hard pipe is connected with the inner end of the mounting flange at one end of the vibration fracture preventive EGR corrugated pipe; the flexible corrugated pipe is of a multilayer clinging structure, and two ends of the flexible corrugated pipe are respectively connected with the other end of the first hard pipe and the inner end of the mounting flange at the other end of the vibration fracture preventive EGR corrugated pipe. The vibration fracture preventive EGR corrugated pipe has the advantages that the vibration fracture preventive EGR corrugated pipe has a sufficient thickness, accordingly, the strength of the vibration fracture preventive EGR corrugated pipe can be improved, the inherent frequencies of the vibration fracture preventive EGR corrugated pipe can be upgraded, and the problem of easiness in causing resonance of an existing corrugated pipe can be solved; the number of layers of the vibration fracture preventive EGR corrugated pipe is increased, the thickness of each single layer is reduced, accordingly, the vibration fracture preventive EGR corrugated pipe is excellent in assembling compensation as compared with a single-layer corrugated pipe with the thickness equal to that of the vibration fracture preventive EGR corrugated pipe, and the problem of skid-mounting requirements due to the fact that existing pipes are excessively hard can be solved.
Description
Technical field
The present invention relates to the discarded recirculating system of engine field, particularly a kind of broken by vibration that preventsEGR bellows.
Background technology
EGR bellows is that the one designing in order to compensate manufacture and rigging error flexibly connects pipeline. UselessGas recirculating system is guided to air inlet pipe by waste gas from blast pipe, and correlated parts forms the connection of a closed loop,Must need flexible steel in flat section tubing to compensate and manufacture and assemble the error causing. Consider the waste gas temperature after burningSpend highlyer, there are 600 DEG C of left and right in general hot junction, has (150～200) DEG C after subcooler is cooling, andAnd in the waste gas after burning, contain corrosive gas, the waste gas tube connector of using on engine is at present mostlyCorrugated stainless steel tubing, not only antirust corrosion-proof but also high temperature resistant, and it is compensatory to possess good assembling.
Current bellows adopts singel-ply bellows, and it exists more shortcoming, and wall thickness selects too thin meeting to causeThe intensity of bellows is low, and intrinsic frequency is very low, is easy to produce resonance and causes fracture, and wall thickness is selected tooThe thick bellows that there will be is again too hard compensatory poor, has erection stress after skid, is easy to occur fracture.
Also have the wave height of bellows to equate to produce side wave effect, the wave stress on keeping to the side when vibration is concentrated tightHeavy, vibration is absorbed by first ripple on limit mostly, and the fault part of the fracture that occurs is all substantiallyFirst ripple cracking on limit, can not well solve the easily problem of fracture of bellows.
The information that is disclosed in this background technology part is only intended to increase the reason to general background of the present inventionSeparate, and should not be regarded as admitting or imply that in any form this information structure has been this area general technologyThe prior art that personnel are known.
Summary of the invention
The object of the present invention is to provide a kind of simple and reasonable EGR ripple that prevents broken by vibrationPipe, this EGR bellows that prevents broken by vibration adopts three layers of bonding structure, has enough thickness, carriesThe intensity of high bellows and the intrinsic frequency of self, solved bellows and easily produced the problem of resonance.Meanwhile, it is compensatory that this EGR bellows has good assembling, and having solved pipe needs asking of skid too firmlyTopic. And reduced the wave height of bellows segment two ends ripples, and increase the rigidity of edge waviness, make vibrationCan be assigned to uniformly each ripple below, while avoiding bellows vibration, stress is concentrated and is caused first rippleOften there is the situation of fracture.
For achieving the above object, the invention provides a kind of EGR bellows that prevents broken by vibration, this is anti-Only the EGR bellows of broken by vibration comprises: mounting flange, it is arranged in pairs in this and prevents broken by vibrationThe two ends of EGR bellows; The first hard tube, the mounting flange of its one end and described EGR bellows one endInner connection; And flexible bellow, it adopts lamination coating structure, the two ends of this flexible bellow withThe inner of the mounting flange of the other end of described the first hard tube and the described EGR bellows other end connects respectivelyConnect.
Preferably, in technique scheme, flexible bellow adopts three layers of bonding structure.
Preferably, in technique scheme, the inner of the mounting flange of the EGR bellows other end also arrangesHave the second hard tube, the two ends of described flexible bellow are connected respectively with described the first hard tube and the second hard tube.
Preferably, in technique scheme, the wave height that flexible bellow is positioned at outermost first rippleLittle, the wave height of second ripple of described first ripple of next-door neighbour is greater than described first ripple.
Preferably, in technique scheme, the quantity that flexible bellow is beaten ripple is 8 to 15, its pitch of wavesFor 6mm to 7mm.
Compared with prior art, the present invention has following beneficial effect: this prevents the EGR ripple of broken by vibrationLine pipe adopts three layers of bonding structure, has enough thickness, has improved the intensity of bellows and consolidating of selfThere is frequency, solved bellows and easily produce the problem of resonance. Meanwhile, this EGR bellows has fineAssembling compensatory, solved the problem that pipe needs skid too firmly. And reduce bellows segment two ends rippleThe wave height of line, has increased the rigidity of edge waviness, makes vibration can be assigned to uniformly below eachRipple, while avoiding bellows vibration, stress is concentrated the situation that causes first ripple often to occur fracture.
Brief description of the drawings
Fig. 1 is the structural representation of the EGR bellows that prevents broken by vibration of the present invention.
Fig. 2 is that the A of Fig. 1 is to structural representation.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that thisThe protection domain of invention is not subject to the restriction of detailed description of the invention.
Unless separately there is other clearly to represent, otherwise in whole description and claims, term " bagDraw together " or its conversion element of stating being understood to include as " comprising " or " including " etc. orPart, and do not get rid of other element or other part.
As shown in Figure 1, according to the EGR bellows that prevents broken by vibration of the specific embodiment of the invention beCircumferential wave bellows, this concrete structure that prevents the EGR bellows of broken by vibration comprises: the installation at two endsFlange 1 and be positioned at the hard tube 2 of this two ends mounting flange 1 the inner, and be arranged on soft between this hard tube 2Property bellows 3. Wherein, the mounting flange at two ends, hard tube and flexible bellow combine by soldering,Flexible bellow 3 adopts three layers of bonding structure, has enough thickness, improved bellows intensity andThe intrinsic frequency of self, has solved bellows and has easily produced the problem of resonance. Meanwhile, this EGR bellowsThere is good assembling compensatory, solved the problem that pipe needs skid too firmly. And flexible bellow 3Reduced the wave height of bellows segment two ends ripples, increased the rigidity of edge waviness, making to vibrate can be evenBe assigned to each ripple below, while avoiding bellows vibration, stress is concentrated and is caused first ripple often to occurThe situation of fracture.
Specifically, the two ends that mounting flange 1 is arranged in pairs in this prevents the EGR bellows of broken by vibration,For with the joint of other equipment connections. Hard tube 2 setting corresponding to one end mounting flange 1, its one end and peaceThe inner of dress flange 1 connects, and the other end is connected with one end of flexible bellow 3, preferred, flexible rippleThe other end of line pipe 3 is connected with the mounting flange of the other end 1. The mounting flange at two ends, hard tube and flexibilityBellows combines by soldering, for ensureing sealing and weld strength, soldering length >=8mm is rightBe greater than 350mm in EGR pipe total length, need increase pipe clamp or support 4 by the suitable position in the middle of pipeFixing to reduce vibration.
As shown in Figure 2, flexible bellow 3 adopts three layers of bonding structure, and the thickness of individual layer is 0.25mm,Three layers of bellows be by certain cooperation, the technique of tubing one deck cover one deck of making bellows is made andBecome, three layers of bellows not only ensured enough thickness but also taken into account the flexibility of pipe, and made this prevent vibrationThe resistance to shock of the EGR bellows of fracture is good, by increasing the bellows number of plies, has improved the strong of bellowsDegree and the intrinsic frequency of self, prevent resonance, greatly reduces the generation of fracture defect. AndThis assembling of EGR bellows that prevents broken by vibration is compensatory good, falls by increasing the bellows number of plies simultaneouslyLow thickness in monolayer, the intensity of the pipe both having ensured, the assembling that has taken into account again pipe is compensatory.
The fracture that prevents the EGR bellows flexible bellow 3 of broken by vibration causes by amplitude is excessive, F=K*Δ X (K rigidity, Δ X displacement), in stressed F mono-timing, rigidity increases, and displacement reduces, so will keep awayExempt from side wave cracking and repeat to occur, need the rigidity that increases by the first, two ripple that the power of vibration is shared uniformlyGo instead of excessive concentrate on the ripple on limit to each ripple below. As shown in Figure 2, flexible bellow 3The ripple of being beaten is not completely contour, the wave height in the middle of the wave height of first and second ripples at two ends is less than,The wave height minimum of first ripple, the wave height of second ripple is greater than first ripple. This flexible bellow 3 reducesThe wave height of bellows segment two ends ripples, increased the rigidity of edge waviness, vibration can be divided uniformlyBe fitted on each ripple below, while avoiding bellows vibration, stress is concentrated and is caused first ripple often to occur fractureSituation. 3 dozens of wave number amounts of flexible bellow are difficult for too much or very few, and the quantity of beating ripple is generally 13Left and right, the pitch of waves is 6mm～7mm, beating ripple, can to affect very little the assembling of bellows compensatory, beats ripple too manyThe intrinsic frequency that can reduce pipe easily produces resonance.
According to present technique, pipe wall thickness is greater than 0.8mm could carry out bending to pipe, and hard tube generally selectsSelect wall thickness 1mm and carry out bending process to the pipe of 1.5mm, between two sections of hard tubes, welding bellows just becomesFlexible steel in flat section tubing. Bellows can be placed on straight section and also can be placed in curved segment, while being placed in curved segment, and bending halfFootpath is greater than R100mm, and the bending radius that bellows segment is larger makes waste gas smooth and easy in the circulation of bellows segment place, subtractsLittle of inertia, the impact of high-temp waste gas to bellows segment.
The regular size parameter of bellows and hard tube is in table 1 and table 2.
Table 1, wave parameter table
Table 2, stainless steel tube bending radius parameter list
To sum up, this EGR bellows that prevents broken by vibration adopts three layers of bonding structure, has enough thickDegree, improved the intensity of bellows and the intrinsic frequency of self, solved bellows and easily produced resonanceProblem. Meanwhile, it is compensatory that this EGR bellows has good assembling, and having solved pipe needs sled too firmlyThe problem of dress. And reduced the wave height of bellows segment two ends ripples, and increase the rigidity of edge waviness, makeMust vibrate each ripple that can be assigned to uniformly below, avoid bellows when vibration stress to concentrate causing theOften there is the situation of fracture in a ripple.
The aforementioned description to concrete exemplary of the present invention is in order to illustrate and the object of illustration.These descriptions not want the present invention to be defined as disclosed precise forms, and obviously, according to above-mentionedInstruction, can much change and change. Exemplary embodiment is selected and the object described existsIn explaining certain principles of the present invention and practical application thereof, thereby make those skilled in the art can be realNow and utilize various exemplary of the present invention and various selection and change.Scope of the present invention is intended to be limited by claims and equivalents thereof.
Claims (5)
1. an EGR bellows that prevents broken by vibration, is characterized in that, comprising:
Mounting flange, the two ends that it is arranged in pairs in this and prevents the EGR bellows of broken by vibration;
The first hard tube, its one end is connected with the inner of the mounting flange of described EGR bellows one end; And
Flexible bellow, it adopts lamination coating structure, the two ends of this flexible bellow and described first hardThe inner of the mounting flange of the other end of pipe and the described EGR bellows other end connects respectively.
2. the EGR bellows that prevents broken by vibration according to claim 1, is characterized in that instituteState flexible bellow and adopt three layers of bonding structure.
3. the EGR bellows that prevents broken by vibration according to claim 1, is characterized in that instituteThe inner of stating the mounting flange of the EGR bellows other end is also provided with the second hard tube, described flexible bellowTwo ends be connected respectively with described the first hard tube and the second hard tube.
4. the EGR bellows that prevents broken by vibration according to claim 1, is characterized in that instituteState the wave height minimum that flexible bellow is positioned at outermost first ripple, second of described first ripple of next-door neighbourThe wave height of individual ripple is greater than described first ripple.
5. the EGR bellows that prevents broken by vibration according to claim 4, is characterized in that instituteStating flexible bellow, to beat the quantity of ripple be 8 to 15, and its pitch of waves is 6mm to 7mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610132393.0A CN105604747A (en) | 2016-03-09 | 2016-03-09 | Vibration fracture preventive EGR (exhaust gas recirculation) corrugated pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610132393.0A CN105604747A (en) | 2016-03-09 | 2016-03-09 | Vibration fracture preventive EGR (exhaust gas recirculation) corrugated pipe |
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| CN105604747A true CN105604747A (en) | 2016-05-25 |
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| CN201610132393.0A Pending CN105604747A (en) | 2016-03-09 | 2016-03-09 | Vibration fracture preventive EGR (exhaust gas recirculation) corrugated pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110770431A (en) * | 2017-06-22 | 2020-02-07 | 五十铃自动车株式会社 | Exhaust gas recirculation device |
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| CN101089446A (en) * | 2007-07-05 | 2007-12-19 | 滕州市绿原机械制造有限责任公司 | Polymer composite corrugated expansion joint |
| CN201368271Y (en) * | 2009-02-14 | 2009-12-23 | 徐州市润杨科技有限公司 | Multilayer metal corrugated pipe |
| CN201786447U (en) * | 2010-09-21 | 2011-04-06 | 江铃汽车股份有限公司 | Oil return pipe of an engine blower |
| CN202532096U (en) * | 2012-03-23 | 2012-11-14 | 十堰巨迪金属管业有限公司 | Connecting pipe for exhaust gas recirculation (EGR) system |
| CN202659324U (en) * | 2012-06-26 | 2013-01-09 | 广西玉柴机器股份有限公司 | Corrugated pipe for exhaust system |
| CN202832734U (en) * | 2012-10-22 | 2013-03-27 | 三一重机有限公司 | Engineering machinery engine exhaust pipe structure |
| CN203906126U (en) * | 2014-05-07 | 2014-10-29 | 广西玉柴机器股份有限公司 | Engine EGR (Exhaust Gas Recirculation) connecting pipe assembly |
| CN204646462U (en) * | 2015-03-10 | 2015-09-16 | 宁波菲力克汽配有限公司 | A kind of double-deck exhaust gas recirculation pipe |
| CN204921120U (en) * | 2015-08-19 | 2015-12-30 | 航天晨光股份有限公司 | Anti compensation ripple pipe flexible -connector that splits |
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2016
- 2016-03-09 CN CN201610132393.0A patent/CN105604747A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2706651Y (en) * | 2004-06-10 | 2005-06-29 | 中国船舶重工集团公司第七二五研究所 | Constrained damping structure vibration-damping noise-reducing metal bellows |
| CN101089446A (en) * | 2007-07-05 | 2007-12-19 | 滕州市绿原机械制造有限责任公司 | Polymer composite corrugated expansion joint |
| CN201368271Y (en) * | 2009-02-14 | 2009-12-23 | 徐州市润杨科技有限公司 | Multilayer metal corrugated pipe |
| CN201786447U (en) * | 2010-09-21 | 2011-04-06 | 江铃汽车股份有限公司 | Oil return pipe of an engine blower |
| CN202532096U (en) * | 2012-03-23 | 2012-11-14 | 十堰巨迪金属管业有限公司 | Connecting pipe for exhaust gas recirculation (EGR) system |
| CN202659324U (en) * | 2012-06-26 | 2013-01-09 | 广西玉柴机器股份有限公司 | Corrugated pipe for exhaust system |
| CN202832734U (en) * | 2012-10-22 | 2013-03-27 | 三一重机有限公司 | Engineering machinery engine exhaust pipe structure |
| CN203906126U (en) * | 2014-05-07 | 2014-10-29 | 广西玉柴机器股份有限公司 | Engine EGR (Exhaust Gas Recirculation) connecting pipe assembly |
| CN204646462U (en) * | 2015-03-10 | 2015-09-16 | 宁波菲力克汽配有限公司 | A kind of double-deck exhaust gas recirculation pipe |
| CN204921120U (en) * | 2015-08-19 | 2015-12-30 | 航天晨光股份有限公司 | Anti compensation ripple pipe flexible -connector that splits |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110770431A (en) * | 2017-06-22 | 2020-02-07 | 五十铃自动车株式会社 | Exhaust gas recirculation device |
| US11047347B2 (en) | 2017-06-22 | 2021-06-29 | Isuzu Motors Limited | Exhaust gas recirculating device |
| CN110770431B (en) * | 2017-06-22 | 2021-08-13 | 五十铃自动车株式会社 | Exhaust gas recirculation device |
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Application publication date: 20160525 |