CN100460800C - Flat heat-exchanging tube - Google Patents
Flat heat-exchanging tube Download PDFInfo
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- CN100460800C CN100460800C CNB2006100986088A CN200610098608A CN100460800C CN 100460800 C CN100460800 C CN 100460800C CN B2006100986088 A CNB2006100986088 A CN B2006100986088A CN 200610098608 A CN200610098608 A CN 200610098608A CN 100460800 C CN100460800 C CN 100460800C
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Abstract
The invention relates to a flat tube, including the flat stainless steel tube, on which end surface installs the raised annular ripple which around the stainless steel tube from the inner to outside; the annular ripple installs on one end or two ends of the stainless steel tube; the height of annular ripple is more than 1.2 mm, and less than 4 mm; the section shape of the annular ripple is the 'U' shape, 'V' shape, 'S' shape, ' omega 'shape or circle arc-shape. The invention is used in the fin-tube heat exchanger; the ripple of the end part has the important effect on relaxing or eliminating the destruction which is raised by the heat bulge cold shrink; the invention is suitable for applying in the automotive engine EGR cooler, at the same time improving the cooler efficiency of the heat exchanger, raise the heat exchanger performance and service life, but also improve the discharge performance of automobile engine to meet increasingly stringent environmental emission requirements.
Description
Technical field
The present invention relates to a kind of flat heat-exchanging tube, be particularly suited for being applied to the vehicle engine exhaust gas recycle cooler or be applied in the turbo charged charge air cooler, have cross sectional shape and be the unequal flat of height and the width and be provided for reducing the heat exchanger tube of the ripple of thermal stress near the place, end.
Background technology
Cooling system for recycled exhaust gas is one of crucial new and high technology of automobile engine world environmental protection standard control oxynitrides (NOx) discharging of satisfying increasingly stringent, and it will become the essential equipment that domestic and international automobile engine satisfies emission request.
Waste gas recirculation cooling technology is after the part waste gas that automobile engine is discharged is cooled off by cooler for recycled exhaust gas, again pass back to cycling and reutilization in the combustion chamber of engine, so both introduced not active gases to the combustion chamber, the content of nitrogen and oxygen in the reduction combustion chamber, can reduce the temperature of combustion chamber again, because the generation of oxynitrides is closely-related with combustion peak and oxygen content, thereby adopt waste gas recirculation cooling technology to suppress oxynitrides generation and discharging.
Wherein, heat exchanger is the key element in the cooling system for recycled exhaust gas, and the height of its heat exchange efficiency has determined the temperature height of EGR gas, therefore, guaranteeing under the prerequisite that engine performance does not reduce overriding concern factor when the heat exchange efficiency that improves heat exchanger is the design heat exchanger; And guaranteeing heat exchanger simultaneously efficiently, the life-span and the utilization rate that improve heat exchanger also are very important.And heat exchanger tube is a critical component of forming heat exchanger, and the height of the heat exchanger tube coefficient of heat transfer and the quality of performance of heat exchange tubes largely affect the size of heat exchanger heat exchange efficiency and the maintain and replace frequency of heat exchanger; The direct manufacturing cost of heat exchanger tube influences the popularization in its market equally, and the design that therefore needs constantly to improve heat exchanger tube simultaneously, is considered the economy of its manufacturing to improve its heat exchange efficiency and utilization rate.
At present, used a kind of fin-tube type heat exchanger tube in some engine exhaust recycle cooler, just at the interior welds fin of pipe to improve its coefficient of heat transfer, and be provided with bulge on the body to improve the disturbance of outer fluid in the pipe, played the effect that absorbs thermal deformation simultaneously to a certain extent.This heat exchanger tube has very high heat exchange efficiency, and when being applied in the cooler for recycled exhaust gas, the heat exchanger tube pipe end is welded on the tube sheet, welds together with housing around the tube sheet.During actual the use, flow through behind the gas of high temperature in the porch, will produce very big thermal deformation and thermal stress near on the pipe at tube sheet place, thermal stress affacts the junction of pipe end and tube sheet, because the limited length of tube-to-tube sheet connection contact, will bear very big thermal stress because of dilatancy at the weld seam of weld; When engine stopped, temperature descended gradually, also gradually the decline of the temperature of pipe, and the expansion of the junction of tube sheet and pipe end is shunk to some extent, and stress descends to some extent.Along with engine start and working repeatedly of stopping, this active force will produce destruction to cooler very soon under the fatigue that replaces is used, and service life is short, and this hidden danger is not if eliminate, and product comes into operation, and will bring certain harm.Therefore need improve this heat exchanger tube, to satisfy the automaker of different demands.
Summary of the invention
Technical problem to be solved by this invention will overcome the in use existing various drawbacks of above-mentioned existing heat exchanger tube exactly, when improving efficiency of heat exchanger, also increases the service life of heat exchanger.The present invention is particularly suited for being applied in the vehicle engine exhaust gas recycle cooler or is applied in the turbocharging charge air cooler, largely improves the heat exchange efficiency of heat exchanger, increases the utilization rate of heat exchanger; Thereby improve the performance of heat exchanger, improve the performance indications of motor vehicle emission and improve the performance of engine.
For this reason, the invention provides a kind of flat heat-exchanging tube, comprise flat stainless steel body, the end surface of described stainless steel body convex with from inside to outside around this stainless steel body annular corrugated.
In the technique scheme, the described annular corrugated one or both ends that can be arranged at the stainless steel body; Described annular corrugated height is greater than 1.2 millimeters, and less than 4 millimeters; Described annular corrugated cross sectional shape is " U " shape, " V " shape, serpentine, " Ω " shape or circular arc; Described annular corrugated one or more annular corrugated for what be arranged in parallel; Described annular corrugated inner for to be recessed annular groove with described stainless steel tube external body ripple corresponding section at described stainless steel body.
The shape of cross section of described stainless steel body is the flat of peripheral arc transition; Lower plane is provided with the bulge of projection or recessed depression on the place, long limit of described stainless steel body cross section; The bulge of described projection or recessed depression adopt rule, orderly array way to distribute and be provided with, and the end is a smooth section; The bulge of described projection or recessed depression are the rectangle of peripheral arc transition, trapezoidal or triangle.
The present invention considers especially because the thermal stress and the thermal deformation problem of expanding with heat and contract with cold and producing of pipe, be provided with ripple at pipe near the end, not only play the effect of eliminating and reducing thermal stress, but also can play the effect that absorbs the pipe thermal deformation, make pipe be in good working order.The design of the flat tube of end band ripple has very high heat transfer efficiency, most importantly the bellows-shaped of end both can absorb thermal expansion, reduce because the thermal stress of expanding with heat and contract with cold and causing can play the effect of support and fixing tube again, reduced the destructive rate of pipe.The present invention is applied in the cooler for recycled exhaust gas, when improving its heat exchange efficiency, has improved the cooler life-span, makes the automobile engine tail gas discharging satisfy the environmental protection standard requirement of increasingly stringent, main effect of the present invention that Here it is.Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the perspective view of the first embodiment of the present invention;
Fig. 2 is first kind of cross sectional shape schematic diagram of medial end portions ripple of the present invention;
Fig. 3 is second kind of cross sectional shape schematic diagram of medial end portions ripple of the present invention;
Fig. 4 is the third cross sectional shape schematic diagram of medial end portions ripple of the present invention;
Fig. 5 is the perspective view of the second embodiment of the present invention;
Fig. 6 is the perspective view of the third embodiment of the present invention;
Fig. 7 is applied to a kind of mounting means schematic diagram in the heat exchanger for the present invention;
Fig. 8 is applied to another kind of mounting means schematic diagram in the heat exchanger for the present invention.
Description of reference numerals:
1-is annular corrugated; The 2-bulge; 3-flat stainless steel body;
The 4-crest; The 5-trough; The 6-rounding off.
The specific embodiment
Fig. 1 is the perspective view of first embodiment among the present invention; As shown in Figure 1, flat stainless steel body 3, the surface of body 3 convexes with around annular corrugated 1 of this stainless steel body 3 from inside to outside near the place, end.
In order to improve heat exchange efficiency, present embodiment on the flat horizontal surface up and down of body 3, that is, and on the residing body in long limit in heat exchanger tube cross section, be provided with the bulge 2 to outer lug that distributes by rule, it is smooth section that the end of body is positioned at annular corrugated 1 outer surface to the top.Above-mentioned bulge 2 also can be the depression that concaves into.Realize the heat exchange of maximal efficiency for the surface that makes full use of heat exchanger tube, the cross sectional shape of the stainless steel body in the embodiment of the invention is a flat; And in order to be easy to production and processing, the little bulge that the body upper and lower surface is arranged is measure-alike, and two ripple size that are arranged in parallel of pipe end also are consistent.The long limit of described body be distributed with little bulge on the whole by the projection of certain array arrangement, the arrangement of little bulge is divided into three rows, middle platoon leader's axle vertically distributes along axis, about two rows then become certain identical angle to be arranged in parallel respectively.The whole transition that is shaped as slyness of little bulge connects.Two parallel corrugations are distributed in pipe end, and the cross sectional shape of ripple can be arranged to different shapes such as " U " shape, " V " shape, serpentine, " Ω " shape or circular arc, different shapes all can play the effect of thermal compensation, when just fluid flows through waveform different, the flow disturbance situation difference that is taken place.The setting of embodiment medial end portions ripple plays an important role, not only can reduce or eliminate the thermal stress of expanding with heat and contract with cold and causing, thereby reduce destruction, and be applied in the heat exchanger pipe, play the effect of supporting mutually between pipe, finally can improve the utilization rate of the heat exchange efficiency and the pipe of pipe.
This set that the end adds the flat tube of ripple all produces turbulent flow fully inside and outside making pipe; Simultaneously,, simplify difficulty of processing,, make all surface all can carry out heat exchange fully well, thoroughly eliminated the heat exchange dead angle so all acute angles of cross section all are designed to arc transition in order to ensure economic and practical.The present invention adopts the method for shaped by fluid pressure to process, and technology is simple, has reduced the process of parts, thereby can reduce cost.Flat tube is equipped with the little bulge of indent or evagination among the present invention in the upper and lower surface of body, be provided with annular ripple near the end, this set make the present invention be applied in the heat exchanger can reinforced pipe in the disturbance of outer fluid, thereby improve whole efficiency of heat exchanger; Most importantly end corrugation can reduce the destruction of the thermal stress exchange heat pipe that causes owing to expanding with heat and contract with cold, and finally improves the overall performance of heat exchanger.
The present invention is applied in the cooler of vehicle engine exhaust gas recirculated cooling system, when waste gas adds the flat tube of ripple and the bulge of body layout by this close end, strong flow phenomenon will take place.Because the design of flat tube is not centrosymmetric shape for round tube commonly used in the past, the geometric center of flat tube and the distance of tube wall differ in size, make the tangible difference to some extent of mobility status of the fluid be positioned at the pipe diverse location, relative flowing takes place between the different fluid of mobility status, thereby formed whirlpool, strengthened the disturbance of fluid, made the most of fluid in the pipe can participate in heat exchange; Simultaneously, because the existence of little bulge and end corrugation, fluid is when flowing through them, undergos mutation in the cross section, thereby produces complicated secondary stream, makes that the disturbance of tube fluid is more violent.The reinforcement of flow disturbance, destroy or attenuate fluid boundary layer, make the heat exchange better effects if; Simultaneously, the enhancing of the disturbance of fluid makes critical Reynolds number reduce, and promptly takes place ahead of time from the transformation of laminar flow to turbulent flow, tube fluid rotatablely moves with producing strong turbulent flow, and the heat exchanging tube wall has souring strongly, and tube wall is less scaling, and even fouling, snaking is also more convenient.
Flat tube among the present invention is owing to add the bulge of ripple and body in the end, solution is expanded with heat and contract with cold and is exchanged the thermal stress effects that heat pipe produces, make pipe not be subject to destruction, the existence of same bulge and ripple has strengthened the mechanical strength of heat exchanger tube, play the effect of supporting between pipe, the disturbance of extratubal fluid also there is effect the present invention of reinforcement to be applied to can all to play outer fluid in managing in the cooler for recycled exhaust gas strengthens the effect of flowing, make the heat exchange effect of fluid strengthen, thereby the temperature of tube fluid descends very fast, the import and export temperature difference strengthens, and heat exchange efficiency improves.
End among the present invention adds the flat tube of ripple and the little bulge of body surface arrangement, this pipe is applied in the cooler for recycled exhaust gas compared with prior art, have advantages such as heat transfer efficiency height, less scaling, compact conformation, thermal stress be little, and design science novelty, features simple and practical process, properties of product are reliable, to be widely used in the cooler for recycled exhaust gas, improve the discharge performance index of automobile engine to a great extent, satisfy the requirement of the Abgasgesetz of following increasingly stringent.
Fig. 2 is first kind of cross sectional shape schematic diagram of medial end portions waveform of the present invention; Ripple be shaped as circular arc, be provided with crest 4 and trough 5, and 5 in crest 4 and trough be set to rounding off 6, the setting in this cross section is easy to processing.And the present invention uses the method for shaped by fluid pressure, with ripple and bulge moulding together, can reduce the program of processing like this, thereby reduces cost of processing.Most importantly, ripple is arranged so that pipe can reduce because the destruction of the thermal stress that produces of expanding with heat and contract with cold.In addition, being provided with of ripple can increase pipe effective heat exchange area, thereby increases the heat exchange amount of outer fluid in the pipe, improves the heat exchange efficiency of pipe.
Fig. 3 is second kind of cross sectional shape schematic diagram of medial end portions waveform of the present invention; The shape of ripple is: 4 ones on crest is for falling " U " shape, and 5 ones in trough is " U " shape, and 5 in crest 4 and trough be set to rounding off 6.All the other are identical with bellows-shaped shown in Figure 2.
Fig. 4 is the third cross sectional shape schematic diagram of medial end portions waveform of the present invention; The shape of ripple is: crest 4 is " Ω " shape, and trough 5 is for falling " Ω " shape, and the change influence of the direction of this shape fluid flow is bigger, and complicated swirl flow takes place when fluid is flowed through ripple, makes the aggravation of flowing to have strengthened heat exchange; And 5 in crest 4 and trough are set to rounding off 6, and this helps processing.The pipe that is arranged so that of ripple can reduce the destruction owing to the thermal stress that produces of expanding with heat and contract with cold.All the other are identical with bellows-shaped shown in Figure 2.
Fig. 5 is the perspective view of second embodiment among the present invention; The difference of embodiment shown in Figure 5 and embodiment 1 is, the side drum bag 2 of embodiment 1 all is to outer lug, and in side drum bag 2 arrangements among the embodiment 2, a middle row is to outer lug, two rows on both sides then are inwardly recessed, so more help the disturbance of tube fluid, the disturbance of strengthening the coefficient of heat transfer one side liquid plays an important role to the heat exchange efficiency of strengthening whole heat exchanger.The ripple of end is then to reducing and eliminate tube sheet and the pipe end junction causes that thermal stress plays a major role owing to expand with heat and contract with cold, thereby reduced the destruction of pipe.
Fig. 6 is the perspective view of the 3rd embodiment among the present invention; Enforcement shown in Figure 6
Example is that with the difference of embodiment 1 embodiment 1 is provided with ripple 1 at an end of body 3, and embodiment 3 then is provided with two ripples 1 at the two ends of body 3.According to the length difference of pipe, ripple 1 the position is set and quantity can change accordingly.Such setting can not only be played the effect of embodiment 1, the ripple 1 at both ends, then to reducing and eliminate tube sheet and the pipe end junction causes that thermal stress plays a major role owing to expand with heat and contract with cold, thereby reduce the destruction of pipe, finally improved the utilization rate of whole heat exchanger.
In the various embodiments described above, its coefficient of heat transfer can also be improved by the welding fin in stainless steel body inside.
Fig. 7 is applied to first kind of mounting means schematic diagram in the heat exchanger for the present invention; As shown in Figure 7, the present invention is installed in the heat exchanger waveform and alternately arranges in import department and exit, so not only plays the effect of thermal compensation, and ripple 1 plays the effect of fixed support pipe at two ends, reduces the distortion of pipe.Manage the existence of outer side drum bag 2 and ripple 1, when making cooling agent flowing pipe outer lug, cause the flow direction of fluid to change thereby meet with obstruction, fluid is in the flow area difference of diverse location, and mobility status changes, and disturbance will be strengthened, and the inside and outside flow disturbance of pipe is all strengthened, be of value to the heat transfer between the fluid like this, the heat exchange effect of fluid strengthens, and whole efficiency of heat exchanger also improves thereupon.
Fig. 8 is applied to second kind of mounting means schematic diagram in the heat exchanger for the present invention; This mounting means is the arrival end that an end that has a ripple 1 all is arranged in waste gas, like this can more effective elimination because the destruction of the thermal stress that causes of expanding with heat and contract with cold.The layout of adjacent two pipe ways is interlaced to be opened, and helps the fixing and supporting role to pipe like this.First kind of mounting means of remaining effect is identical.
The present invention has very high heat exchange property and good thermal compensation ability, be applied in the cooler for recycled exhaust gas, can obtain very big cooling effect, main is since end corrugation is set the service life of having improved cooler, make the limited space of automobile engine more compact simultaneously, thereby improve the discharge performance index of automobile engine, the environmental requirement that satisfied future is strict more.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (10)
1. a flat heat-exchanging tube comprises flat stainless steel body, it is characterized in that, the end surface of described stainless steel body is provided with from inside to outside annular corrugated around this stainless steel body of projection.
2. flat heat-exchanging tube according to claim 1 is characterized in that, the described annular corrugated one or both ends that are arranged at described stainless steel body.
3. flat heat-exchanging tube according to claim 1 and 2 is characterized in that, described annular corrugated height is greater than 1.2 millimeters, and less than 4 millimeters.
4. flat heat-exchanging tube according to claim 1 and 2 is characterized in that, described annular corrugated cross sectional shape is " U " shape, " V " shape, serpentine, " Ω " shape or circular arc.
5. flat heat-exchanging tube according to claim 1 and 2 is characterized in that, and is described annular corrugated one or more annular corrugated for what be arranged in parallel.
6. flat heat-exchanging tube according to claim 1 and 2 is characterized in that, and is described annular corrugated inner for to be recessed annular groove with described stainless steel tube external body ripple corresponding section at described stainless steel body.
7. flat heat-exchanging tube according to claim 1 is characterized in that, the shape of cross section of described stainless steel body is the flat of peripheral arc transition.
8. flat heat-exchanging tube according to claim 1 is characterized in that, lower plane is provided with the bulge of projection or recessed depression on the place, long limit of described stainless steel body cross section; Described stainless steel body inside is provided with fin.
9. flat heat-exchanging tube according to claim 8 is characterized in that, the bulge of described projection or recessed depression adopt uniform array way to distribute and be provided with.
10. according to Claim 8 or 9 described flat heat-exchanging tubes, it is characterized in that the bulge of described projection or recessed depression are the rectangle of peripheral arc transition, trapezoidal or triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100986088A CN100460800C (en) | 2006-07-07 | 2006-07-07 | Flat heat-exchanging tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100986088A CN100460800C (en) | 2006-07-07 | 2006-07-07 | Flat heat-exchanging tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101101183A CN101101183A (en) | 2008-01-09 |
| CN100460800C true CN100460800C (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100986088A Active CN100460800C (en) | 2006-07-07 | 2006-07-07 | Flat heat-exchanging tube |
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| CN (1) | CN100460800C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5499957B2 (en) * | 2009-07-24 | 2014-05-21 | 株式会社デンソー | Heat exchanger |
| CN103398616A (en) * | 2013-07-29 | 2013-11-20 | 无锡方盛换热器制造有限公司 | Flat heat exchange tube used for heat exchanger |
| CN115077287A (en) * | 2022-08-18 | 2022-09-20 | 杭州绿能新能源汽车部件有限公司 | Heat exchange tube and heat exchanger |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1132552A (en) * | 1993-08-04 | 1996-10-02 | 因西尔科公司热部件部门 | Radiator tube and method and appts. for forming same |
| CN2432540Y (en) * | 2000-06-27 | 2001-05-30 | 张世荣 | Metal heat-exchange special shaped sylphon bellows |
| JP2001342909A (en) * | 2000-06-05 | 2001-12-14 | Hino Motors Ltd | Egr cooler |
| JP2004263616A (en) * | 2003-02-28 | 2004-09-24 | Toyo Radiator Co Ltd | Flat tube for egr cooler |
| CN2685802Y (en) * | 2004-03-09 | 2005-03-16 | 海亮集团浙江铜加工研究所有限公司 | Single screw waveform brass condesation tube |
| US20050161206A1 (en) * | 2003-12-19 | 2005-07-28 | Peter Ambros | Heat exchanger with flat tubes |
| CN2929626Y (en) * | 2006-07-07 | 2007-08-01 | 北京美联桥科技发展有限公司 | Flat heat exchange tube |
-
2006
- 2006-07-07 CN CNB2006100986088A patent/CN100460800C/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1132552A (en) * | 1993-08-04 | 1996-10-02 | 因西尔科公司热部件部门 | Radiator tube and method and appts. for forming same |
| JP2001342909A (en) * | 2000-06-05 | 2001-12-14 | Hino Motors Ltd | Egr cooler |
| CN2432540Y (en) * | 2000-06-27 | 2001-05-30 | 张世荣 | Metal heat-exchange special shaped sylphon bellows |
| JP2004263616A (en) * | 2003-02-28 | 2004-09-24 | Toyo Radiator Co Ltd | Flat tube for egr cooler |
| US20050161206A1 (en) * | 2003-12-19 | 2005-07-28 | Peter Ambros | Heat exchanger with flat tubes |
| CN2685802Y (en) * | 2004-03-09 | 2005-03-16 | 海亮集团浙江铜加工研究所有限公司 | Single screw waveform brass condesation tube |
| CN2929626Y (en) * | 2006-07-07 | 2007-08-01 | 北京美联桥科技发展有限公司 | Flat heat exchange tube |
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| CN101101183A (en) | 2008-01-09 |
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Address after: 100124 Chen Jialin, 9 hospital, eight Li Zhuang village, Gaobeidian Township, Chaoyang District, Beijing, 7 floor 705, 706 rooms, building 1, Co-patentee after: JINZHOU U BRIDGE AUTO PARTS Co.,Ltd. Patentee after: BEIJING MEILIANQIAO TECHNOLOGY GROUP Co.,Ltd. Address before: 100022 room 2503, Jian Wai SOHOA, 39 East Third Ring Road, Chaoyang District, Beijing. Co-patentee before: JINZHOU U BRIDGE AUTO PARTS Co.,Ltd. Patentee before: BEIJING U BRIDGE LLC |
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Effective date of registration: 20220217 Address after: 121000 No. 25, Shuguang street, Taihe District, Jinzhou City, Liaoning Province Patentee after: Jinzhou lianyoubo Pipe Industry Co.,Ltd. Address before: 100124 Chen Jialin, 9 hospital, eight Li Zhuang village, Gaobeidian Township, Chaoyang District, Beijing, 7 floor 705, 706 rooms, building 1, Patentee before: BEIJING MEILIANQIAO TECHNOLOGY GROUP Co.,Ltd. Patentee before: JINZHOU U BRIDGE AUTO PARTS Co.,Ltd. |
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Effective date of registration: 20221208 Address after: 121000 No. 25 Shuguang street, industrial zone, hi tech Industrial Development Zone, Liaoning, Jinzhou Patentee after: Liaoning Lianyoubo Technology Co.,Ltd. Address before: 121000 No. 25, Shuguang street, Taihe District, Jinzhou City, Liaoning Province Patentee before: Jinzhou lianyoubo Pipe Industry Co.,Ltd. |
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