CN113153584A - Pipe connection structure and exhaust gas recirculation system - Google Patents
Pipe connection structure and exhaust gas recirculation system Download PDFInfo
- Publication number
- CN113153584A CN113153584A CN202110594844.3A CN202110594844A CN113153584A CN 113153584 A CN113153584 A CN 113153584A CN 202110594844 A CN202110594844 A CN 202110594844A CN 113153584 A CN113153584 A CN 113153584A
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- Prior art keywords
- pipe
- connection
- connecting port
- rigid inner
- interface part
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- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 23
- 239000002912 waste gas Substances 0.000 abstract description 12
- 230000009471 action Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Joints Allowing Movement (AREA)
Abstract
The invention discloses a pipe connecting structure which comprises a first connecting port part, a middle pipe and a second connecting port part which are sequentially connected, wherein the middle pipe comprises a rigid inner pipe, a corrugated pipe and a woven sheath which are sequentially arranged from inside to outside, two ends of the rigid inner pipe are respectively and tightly matched with the first connecting port part and the second connecting port part, two ends of the corrugated pipe are respectively and hermetically connected with the first connecting port part and the second connecting port part, and two ends of the woven sheath are respectively and fixedly connected with the first connecting port part and the second connecting port part. Inside rigidity inner tube can direct contact waste gas, and the guide waste gas bears the high temperature high pressure of waste gas to and neglect cold and neglect hot alternating stress, and bellows wherein can play sealed guard action, weave the sheath and can carry out physical protection to comparatively weak bellows. The invention also discloses an exhaust gas recirculation system comprising the pipe connection structure.
Description
Technical Field
The invention relates to the technical field of pipeline connection, in particular to a pipe connection structure and an exhaust gas recirculation system comprising the pipe connection structure.
Background
With the increasingly strict requirements on emission and use economy of the engine, part of low-temperature waste gas needs to be introduced while fresh air is introduced during combustion of the engine, a waste gas connecting pipeline needs to be designed, a steel pipe is generally adopted to connect two connectors, and the pipeline needs to bear alternating stress of sudden cooling and sudden heating generated during the operation of the engine and vibration of the engine, so that the cracking phenomenon is easily generated.
In summary, how to effectively solve the problems of vibration and poor alternating stress of the connecting pipe is a problem which needs to be solved urgently by those skilled in the art at present.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a pipe connection structure which can effectively solve the problems of the connection pipe that is subject to vibration and poor in alternating stress, and a second object of the present invention is to provide an exhaust gas recirculation system including the above pipe connection structure.
In order to achieve the first object, the invention provides the following technical scheme:
the utility model provides a pipe connection structure, is including the first interface part that connects gradually, well pipe and second even interface part, well pipe includes rigid inner tube, bellows that sets gradually from inside to outside and weaves the sheath, rigid inner tube both ends respectively with first interface part second interface part closely cooperates, the bellows both ends respectively with first interface part with second interface part sealing connection, weave the sheath both ends respectively with first interface part with second interface part fixed connection.
In the pipe connection structure, when the pipe connection structure is connected between an air inlet channel and an exhaust channel of an engine, part of high-pressure high-temperature exhaust gas directly impacts a rigid inner pipe of the intermediate pipe when entering the intermediate pipe, and bears large impact force and high temperature. In the use process, when the gap is formed between the rigid inner pipe and the first connecting port or the second connecting port due to slight deformation caused by vibration and high pressure ratio, the corrugated pipe located on the outer side of the rigid inner pipe is allowed to have certain deformation, so that the sealing requirement can be guaranteed, and the integral sealing requirement can be guaranteed through the corrugated pipe. And the braided sheath can be physically protected at the outermost side, so that the corrugated pipe is prevented from being damaged by the shearing force and other destructive forces. In this union coupling structure, divide into the intermediate pipe three-layer pipe fitting, inside rigidity inner tube can direct contact waste gas, guide waste gas, bear the high temperature high pressure of waste gas to and neglect the alternating stress of cold suddenly hot, and bellows wherein can play sealed guard action, when the leakproofness is not enough at rigidity inner tube junction, seal the guarantee. The braided sheath can physically protect the weak corrugated pipe. Therefore, the pipe connection structure can effectively solve the problems that the connection pipe bears vibration and alternating stress is not good.
Preferably, two ends of the rigid inner tube are respectively inserted into the first connecting port and the second connecting port and are in interference fit with each other.
Preferably, the first connecting port and the second connecting port are both arranged in a hole-enlarged manner at one end close to the rigid inner tube, and two ends of the rigid inner tube are respectively arranged in a hole-enlarged manner in cooperation with the hole-enlarged portions at the ends of the first connecting port and the second connecting port.
Preferably, the first connecting port is an inlet port, the inlet end of the rigid inner tube has a radial protrusion, and the radial protrusion is in interference fit with the hole expanding portion of the first connecting port.
Preferably, the inlet section bore diameter of the first connecting port section is no greater than the rigid inner tube diameter.
Preferably, said rigid inner tube comprises a straight steel tube and said radial protrusion at one end of said straight steel tube.
Preferably, the two ends of the corrugated pipe are respectively sleeved outside the first connecting port part and the second connecting port part and are in interference fit and welded connection.
Preferably, the two ends of the braided sheath are respectively sleeved on the outer walls of the two ends of the corrugated pipe and are in interference fit and welded connection.
Preferably, the first connecting port is a flange portion, the second connecting port is an elbow, and the braided sheath is a metal braided sheath.
In order to achieve the second object, the present invention further provides an exhaust gas recirculation system, which includes any one of the pipe connection structures, an exhaust gas channel, and an engine air intake channel, wherein the first connection portion of the pipe connection structure is communicated with the exhaust gas channel, and the second connection portion is communicated with the engine air intake channel. Since the pipe connection structure has the above technical effects, the exhaust gas recirculation system having the pipe connection structure should also have corresponding technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a pipe connection structure according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
fig. 3 is an enlarged schematic view of a portion B in fig. 1.
The drawings are numbered as follows:
the connecting structure comprises a first connecting port part 1, a braided sheath 2, a corrugated pipe 3, a rigid inner pipe 4, a second connecting port part 5, an inlet part inner hole 11, a conical hole part 12, a first reaming part 13, a radial outer protrusion 41 and a straight steel pipe 42.
Detailed Description
The embodiment of the invention discloses a pipe connecting structure, which effectively solves the problems that a connecting pipe bears vibration and has poor alternating stress.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of a pipe connection structure according to an embodiment of the present invention; FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1; fig. 3 is an enlarged schematic view of a portion B in fig. 1.
In one embodiment, the present embodiment provides a pipe connection structure, which is mainly used in an EGR system (exhaust gas recirculation system) to connect to an exhaust gas pipeline, and the other end is connected to a combustion chamber of an engine. Specifically, the pipe connection structure comprises a first connection port 1, an intermediate pipe and a second connection port 5 which are connected in sequence, wherein the first connection port 1 and the second connection port 5 are used for connecting a waste gas pipeline and an air inlet pipeline respectively. The middle pipe comprises a rigid inner pipe 4, a corrugated pipe 3 and a braided sheath 2 which are arranged from inside to outside in sequence so as to form layer-by-layer protection.
Specifically, the rigid inner pipe 4 is a pipe body which is not easily deformed and can bear high stress and high temperature, so as to be directly contacted with the internal high-temperature and high-pressure exhaust gas. Specifically, a high temperature resistant material, specifically a metal tube, may be used, or a tube body made of the same material as the exhaust gas tube may be used. Two ends of the rigid inner tube 4 are respectively tightly matched with the first connecting port part 1 and the second connecting port part 5, so that a high sealing effect is achieved through tight matching, and meanwhile, gas is better and directly guided to flow through an inner tube cavity. The specific connection mode is interference fit, butt joint, pressing connection and the like. In order to avoid the rigid inner tube 4 from being subjected to a large force, at least one of the two ends of the rigid inner tube 4 may have a movement margin in the extending direction with respect to the corresponding first connecting port 1 or the corresponding second connecting port 5.
The bellows 3 refers to a pipe member capable of performing a certain tensile deformation along an extending direction, and a metal bellows is still used here to be able to withstand a higher temperature. Wherein the bellows 3 both ends respectively with first connection port portion 1 and the sealed connection of second connection port portion 5 to when there is slight deviation in first connection port portion 1 relative second connection port portion 5, bellows 3 can be through self tensile, with the adaptation deviation, and then can guarantee both ends sealed effect effectively. In which the bellows 3 need not directly withstand the greater temperatures and pressures, it is possible to make the thickness of the bellows 3 smaller than that of the rigid inner tube 4.
The braided sheath 2 is sleeved outside the corrugated pipe 3 to protect the corrugated pipe 3 and the rigid inner pipe 4 inside. The braided sheath 2, such as a metal hose, has high flexibility due to the braiding, and has high lateral pressure resistance, thereby physically protecting the corrugated tube 3 and the rigid inner tube 4 located inside. Specifically, two ends of the braided sheath 2 are fixedly connected to the first connecting port 1 and the second connecting port 5, respectively, it should be noted that the two ends of the braided sheath 2 are fixedly connected to the first connecting port 1 and the second connecting port 5, and the two ends of the braided sheath may be directly fixedly connected to each other or indirectly fixedly connected to each other, so as to avoid the two ends of the braided sheath 2 from moving away from the first connecting port 1 and the second connecting port 5.
In the pipe connection structure, when the pipe connection structure is connected between an air intake passage and an exhaust passage of an engine, a part of high-pressure and high-temperature exhaust gas directly impacts the rigid inner pipe 4 of the intermediate pipe when entering the intermediate pipe, and is subjected to a large impact force and a high temperature. In the using process, when a gap occurs between the rigid inner tube 4 and the first connecting port 1 or the second connecting port 5 due to slight deformation when vibration and pressure ratio are large, the corrugated tube 3 located outside the rigid inner tube 4 is allowed to have certain deformation, so that the sealing requirement can not be ensured by adapting to the change through deformation when vibration or pressure is large, and further the integral sealing requirement can be ensured through the corrugated tube 3. The braided sheath 2 can be physically protected at the outermost side to prevent the corrugated pipe 3 from being damaged by a destructive force such as a shearing force. In this pipe connection structure, divide into the intermediate pipe three-layer pipe fitting, inside rigidity inner tube 4 can direct contact waste gas, guide waste gas, bear the high temperature high pressure of waste gas to and the alternating stress of neglecting cold and neglecting hot, and bellows 5 wherein can play sealed guard action to when the leakproofness is not enough in rigidity inner tube 4 junction, carry out sealed guarantee. The braided jacket 2 physically protects the relatively weak corrugated tubing 3. Therefore, the pipe connection structure can effectively solve the problems that the connection pipe bears vibration and alternating stress is not good.
As described above, both ends of the rigid inner tube 4 are tightly fitted with the first connecting port 1 and the second connecting port 5, respectively, and for better connection, both ends of the rigid inner tube 4 are preferably inserted into the first connecting port 1 and the second connecting port 5, respectively, and are in interference fit with each other. To better ensure intimate contact through an interference fit.
Further, in order to better guide the gas to flow at the junction, it is preferable that the first connecting port 1 and the second connecting port 5 are both provided with a hole enlarged near one end of the rigid inner tube 4, and both ends of the rigid inner tube 4 are respectively provided with a hole enlarged at the end of the first connecting port 1 and the second connecting port 5. That is, the first connecting port 1 has a first hole expanding portion 13, and the second connecting port 5 has a second hole expanding portion, and the first hole expanding portion 13 and the second hole expanding portion are respectively fitted to both ends of the rigid inner tube 4.
Further, for better stress deformation, it is preferred that the first connecting port 1 is an inlet portion, wherein the inlet end of the rigid inner tube 4, i.e. the end thereof which is connected to the first connecting port, has a radial outer protrusion 41, and the radial outer protrusion 41 is in interference fit with the first reamer part 13 of the first connecting port 1. Wherein the rigid inner pipe 4 preferably comprises a cylindrical pipe section and a radial outer protrusion 41 outside one end of the cylindrical pipe section, and wherein the part of the rigid inner pipe 1 inserted into the second connection port 5 is the other end of the cylindrical pipe section. The particular cylindrical tube portion is preferably a straight steel tube 42, wherein the radially outer protrusion 41 is preferably integrally formed with the straight steel tube 42.
Correspondingly, for better gas guidance, it is preferred here that the inlet section inner bore of the first connecting port section 1 is not larger than the diameter of the rigid inner tube 4. Specifically, the inner bore of the first connecting part 1 includes an inlet part inner bore 11, a tapered bore part 12 and a first enlarged bore part 13, wherein the first enlarged bore part 13 is a cylindrical bore part and has an inner diameter larger than the diameter of the inlet part inner bore 11, the large diameter end of the tapered bore part 12 is connected with the first enlarged bore part 13 and has the same diameter, and the small diameter end is connected with the inlet part inner bore 11 and has the same diameter.
Regarding the connection between the corrugated tube 3 and the braided sheath 2, it is preferable that both ends of the corrugated tube 3 are respectively sleeved outside the first connecting port 1 and the second connecting port 5, and are connected by interference fit and welding. Correspondingly, the two ends of the braided sheath 2 can be respectively sleeved on the outer walls of the two ends of the corrugated pipe 3 and are in interference fit and welded connection.
It should be noted that, when the pipe connection structure is applied to an exhaust gas recirculation system, the first connection part 1 is a flange part, and the second connection part 5 is an elbow pipe, wherein the flange part inner hole is provided with an inlet part inner hole 11, a taper hole part 12 and a first reaming part 13 in sequence along the extending direction. The elbow is a right-angle elbow, namely, the included angle of the axes of the pipe orifices at the two ends is a right angle and is an arc-shaped steel pipe. The pipe orifice at one end of the elbow is internally provided with a second reaming part.
Based on the pipe connection structure provided in the above embodiment, the present invention further provides an exhaust gas recirculation system, which includes any one of the pipe connection structures in the above embodiments, and further includes an exhaust gas channel and an engine air intake channel, wherein the first connection portion of the pipe connection structure is communicated with the exhaust gas channel, and the second connection portion is communicated with the engine air intake channel. Since the exhaust gas recirculation system adopts the pipe connection structure in the above embodiment, please refer to the above embodiment for the beneficial effects of the exhaust gas recirculation system.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a pipe connection structure, is including the first interface part that connects gradually, intermediate pipe and second even interface part, its characterized in that, intermediate pipe includes rigid inner tube, bellows that sets gradually from inside to outside and weaves the sheath, rigid inner tube both ends respectively with first interface part second interface part closely cooperates, the bellows both ends respectively with first interface part with second interface part sealing connection, weave the sheath both ends respectively with first interface part with second interface part fixed connection.
2. The pipe connection structure according to claim 1, wherein both ends of the rigid inner pipe are respectively inserted into the first connection port portion and the second connection port portion and are in interference fit with each other.
3. The pipe connection structure according to claim 2, wherein the first connection port and the second connection port are both provided with a counterbore near one end of the rigid inner pipe, and both ends of the rigid inner pipe are respectively provided with counterbores at ends of the first connection port and the second connection port in a fitting manner.
4. A pipe connection according to claim 3, wherein the first connection portion is an inlet portion, the inlet end of the rigid inner pipe has a radially outer protrusion, and the radially outer protrusion is an interference fit with the counterbore of the first connection portion.
5. A tube connection according to claim 4, wherein the inlet portion internal bore diameter of the first connection port portion is no greater than the rigid internal tube diameter.
6. A tubular connection according to claim 5, characterized in that the rigid inner tube comprises a straight steel tube and the radial outer protrusion is located at one end of the straight steel tube.
7. The pipe connection structure according to any one of claims 1 to 6, wherein both ends of the bellows are respectively fitted around the outside of the first connection port and the second connection port, and are connected by interference fit and welding.
8. The pipe connection structure according to claim 7, wherein the two ends of the braided sheath are respectively sleeved on the outer walls of the two ends of the corrugated pipe, and are in interference fit and welded connection.
9. A pipe connecting structure according to claim 8, wherein the first connecting port portion is a flange portion, the second connecting port portion is a bent pipe, and the braided sheath is a metal braided sheath.
10. An exhaust gas recirculation system comprising an exhaust gas passage and an engine air intake passage, further comprising a pipe connection according to any one of claims 1-8, the first connection portion of the pipe connection communicating with the exhaust gas passage and the second connection portion communicating with the engine air intake passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110594844.3A CN113153584A (en) | 2021-05-28 | 2021-05-28 | Pipe connection structure and exhaust gas recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110594844.3A CN113153584A (en) | 2021-05-28 | 2021-05-28 | Pipe connection structure and exhaust gas recirculation system |
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| Publication Number | Publication Date |
|---|---|
| CN113153584A true CN113153584A (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110594844.3A Pending CN113153584A (en) | 2021-05-28 | 2021-05-28 | Pipe connection structure and exhaust gas recirculation system |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990021122U (en) * | 1997-11-28 | 1999-06-25 | 정몽규 | Inner Pipe Type Bellows Assembly |
| JP2006336587A (en) * | 2005-06-03 | 2006-12-14 | Calsonic Kansei Corp | Flexible tube for exhaust system of automobile |
| DE102006039230A1 (en) * | 2005-08-24 | 2007-03-15 | Iwka Balg- Und Kompensatoren-Technologie Gmbh | Exhaust gas pipeline for use in internal combustion engine, has fabricated metal tube placed between ends of pipeline to provide longitudinal support to pipeline and is turned coaxially towards pipeline by two spacers |
| JP2010071101A (en) * | 2008-09-16 | 2010-04-02 | Hirotec Corp | Flexible tube |
| CN103147832A (en) * | 2013-03-19 | 2013-06-12 | 中国北方发动机研究所(天津) | Corrugated pipe combined structure for diesel engine |
| CN203948153U (en) * | 2014-04-25 | 2014-11-19 | 无锡新得宝金属软管有限公司 | A kind of automobile flexible joint structure that is beneficial to vibration damping |
| CN110905643A (en) * | 2019-11-28 | 2020-03-24 | 徐州徐工挖掘机械有限公司 | Floated water conservancy diversion blast pipe and engineering equipment |
| CN211174397U (en) * | 2019-09-18 | 2020-08-04 | 广西玉柴机器股份有限公司 | Air inlet corrugated pipe of EGR cooler |
| CN215256514U (en) * | 2021-05-28 | 2021-12-21 | 安徽华菱汽车有限公司 | Pipe connection structure and exhaust gas recirculation system |
-
2021
- 2021-05-28 CN CN202110594844.3A patent/CN113153584A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990021122U (en) * | 1997-11-28 | 1999-06-25 | 정몽규 | Inner Pipe Type Bellows Assembly |
| JP2006336587A (en) * | 2005-06-03 | 2006-12-14 | Calsonic Kansei Corp | Flexible tube for exhaust system of automobile |
| DE102006039230A1 (en) * | 2005-08-24 | 2007-03-15 | Iwka Balg- Und Kompensatoren-Technologie Gmbh | Exhaust gas pipeline for use in internal combustion engine, has fabricated metal tube placed between ends of pipeline to provide longitudinal support to pipeline and is turned coaxially towards pipeline by two spacers |
| JP2010071101A (en) * | 2008-09-16 | 2010-04-02 | Hirotec Corp | Flexible tube |
| CN103147832A (en) * | 2013-03-19 | 2013-06-12 | 中国北方发动机研究所(天津) | Corrugated pipe combined structure for diesel engine |
| CN203948153U (en) * | 2014-04-25 | 2014-11-19 | 无锡新得宝金属软管有限公司 | A kind of automobile flexible joint structure that is beneficial to vibration damping |
| CN211174397U (en) * | 2019-09-18 | 2020-08-04 | 广西玉柴机器股份有限公司 | Air inlet corrugated pipe of EGR cooler |
| CN110905643A (en) * | 2019-11-28 | 2020-03-24 | 徐州徐工挖掘机械有限公司 | Floated water conservancy diversion blast pipe and engineering equipment |
| CN215256514U (en) * | 2021-05-28 | 2021-12-21 | 安徽华菱汽车有限公司 | Pipe connection structure and exhaust gas recirculation system |
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