CN1632300A - Exhaust cooler core for exhaust gas recirculation system and method for making same - Google Patents
Exhaust cooler core for exhaust gas recirculation system and method for making same Download PDFInfo
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- CN1632300A CN1632300A CNA2004100902435A CN200410090243A CN1632300A CN 1632300 A CN1632300 A CN 1632300A CN A2004100902435 A CNA2004100902435 A CN A2004100902435A CN 200410090243 A CN200410090243 A CN 200410090243A CN 1632300 A CN1632300 A CN 1632300A
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- radiating fin
- pipe
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- exhaust gas
- radiator centre
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Exhaust-Gas Circulating Devices (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention discloses a heat radiator core used in an exhaust gas refrigerating mechanism in an exhaust gas recirculating system and method for manufacturing same. Said method comprises the following steps: coating the outer margin of the heat radiating fin with paste shaped solder and inserting them into tubes; forming ring form plow grooves at said tubes and fixing the heat radiating fin temporarily therein; embedding and inserting two terminals of several tubes equipped with heat radiating fins into through holes of a pair of end plates; heating the well mounted heat radiator cores to hard solder the outer margin of said heat radiating fin to inside of the tubes. In accordance with the present invention, by inserting heat radiating fin into tubes firstly and then forming ring form plow grooves at the tubes, it is possible to reduce the gapping place between the annular recess of tubes and the outer margin of the heat radiating fin and their inner surfaces can be reliably hard soldered, then the heat diffusion come from the heat radiating fin is increased with the increase of the heat transfer area of the tubes, and then the turbulent current fluidization of EGR gas fluid flow is promoted, these factors improve the exchange of heat efficiency.
Description
Technical field
The present invention relates to the radiator centre and the manufacture method thereof of gas recirculation system (EGR) exhaust gas cooling device.This gas recirculation system exhaust gas cooling device is to be used for cooling to draw from vent systems, through the exhaust gas recirculation pipeline, enters the waste gas that carries out recirculation in the suction tude.
Background technique
Recently in order to reduce nitrogen oxide (NOx) content in the automobile engine to exhaust, adopted exhaust gas recirculation (EGR) technology, i.e. extension waste gas from vent systems, and it is joined carry out recirculation in the combustion mixture, thereby reduce nitrogen oxides of exhaust gas (NOx) content to reduce combustion temperature.
In EGR (exhaust gas recirculation) device,, therefore, be necessary to make EGR gas to keep proper temperature because EGR gas is to be inhaled into the firing chamber with mixed gas.EGR gas was very high with regard to temperature originally, and if the temperature of EGR gas too high, will cause mixed gas to be heated, air inflow that make to introduce the firing chamber reduces, and causes the rate of combustion of mixed gas to worsen, and engine output is descended.
On the other hand, if the EGR gas temperature is low excessively, the viscosity of coherent substance (being impurity) such as tar will increase in the EGR gas, and impurity adheres on EGR passage and EGR valve or the like easily, makes the EGR device reliability reduce.
Fig. 9 is expressed as traditional EGR gas quench system, on housing 1, be provided with the inlet duct 4 of cooling water and the mounting hole of outer pipe 5, in the upper end of housing 1 is to introduce EGR gas inlet pipe 6, and be the steam outlet pipe 7 that EGR gas flows out in its lower end, disposing radiator centre C and dunnage 8 thereof in the housing 1.With reference to Figure 10, described radiator centre C is made of end plate 3 and pipe 2, and pipe 2 is formed with spiral helicine burr groove 2a, and in the pipe 2 radiating fin 9 is installed.Radiating fin 9 as shown in figure 11, is to be twisted into helical, and its periphery is brazed on formed burr groove 2a on the pipe 2.
The effect that is formed with spiral helicine burr groove 2a on pipe 2 is temporary fixed described radiating fin 9, owing to increased radiating fin 9, the turbulization that can increase heat transfer area and help the EGR gas stream just can improve temperature conductivity, improves heat exchange efficiency.In addition, adhesion and the thickening of cigarette ash on 2 inner face of sneaking in the EGR gas can also be controlled.
The radiator centre of this traditional E GR gas quench system, the difficulty of processing of the spiral helicine burr groove 2a on its pipe 2 is bigger.The installation process of this radiator centre is as follows: punching press in advance forms spiral helicine burr groove 2a on pipe 2, inserts the radiating fin 9 that outer rim is coated with brazing metal then in pipe 2, and then the outer rim with radiating fin 9 is brazed on the burr groove 2a.During operation, promptly will suitably dwindle the burr groove 2a of pipe 2 and the outer intermarginal gap size of radiating fin 9, also radiating fin 9 will be brazed in the pipe 2 reliably, these have all brought big problem to its manufacturing.
Summary of the invention
What the present invention will solve is the problems referred to above that prior art exists, and aims to provide a kind of radiator centre of processing simple gas recirculation system exhaust gas cooling device.
The present invention also will provide a kind of radiator centre and manufacture method thereof that can reliably radiating fin be brazed to the EGR gas quench system in the pipe.
The technological scheme that solves the problems of the technologies described above employing is: the radiator centre of gas recirculation system exhaust gas cooling device, the several pipes of configuration between a pair of end plate, be provided with radiating fin in the described pipe, offer temporary fixed the annular groove of stating radiating fin on the described pipe.
Offer annular groove on the pipe of the present invention and substitute traditional spirality burr groove, and this annular groove normally forms in the punch process mode, therefore easy to process to hold the radiating fin of similar axle, can enhance productivity and the up-to-standard rate of product.
According to the present invention, the end of described pipe is inserted on the described end plate in the formed through hole by embedding, and the two ends of described radiating fin are positioned fixing length in two ends of the described pipe of distance.
According to the present invention, on the end of described pipe, form diameter reducing part, and this diameter reducing part is inserted on the above-mentioned end plate in the formed through hole by embedding.
According to the present invention, the undergauge position is carried out the enlarging operation or formed flange.
The manufacture method of the radiator centre of gas recirculation system exhaust gas cooling device of the present invention, carry out according to the following steps:
One, after the outer rim of radiating fin is coated paste solder, insert in the pipe;
Two, on described pipe, form annular groove, make described radiating fin therein temporary fixed;
Three, several two ends embeddings that install the pipe of radiating fin are inserted in the through hole on a pair of end plate;
Four, mounted radiator centre is carried out heat treated, the outer rim of described radiating fin is soldered in the described pipe.
The manufacture method of radiator centre of the present invention, be earlier radiating fin to be inserted in the pipe, and then on pipe, form annular groove, this just makes the circular groove that dwindles pipe and the outer intermarginal gap of radiating fin become possibility, also make with radiating fin outer rim and inner surface of tube reliably soldering become possibility.And since the outer rim of inserting the radiating fin in the pipe reliably soldering on the annular groove of pipe, feasible heat transfer from radiating fin has also increased because of the increase of pipe heat transfer area, also make the turbulization of EGR gas stream obtain promoting that these all make heat exchange efficiency be improved.
According to the present invention, the two ends of described radiating fin are positioned fixing length in two ends of the described pipe of distance.After described step 3 finishes, utilize drift to go out undergauge and stage, and then the end diameter of above-mentioned pipe is enlarged or form flange to reduce the gap with flaring die in the end of pipe.Because the two ends of radiating fin are positioned at just from the position of pipe two ends defined length, therefore avoided the mutual interference of radiating fin and flaring die.
Described paste solder is the outer rim that is coated in described radiating fin by the following method: the outer rim at described radiating fin is symmetrically arranged with four applying devices, described each applying device comprises an arm, an outer cylinder and an interior cylinder, paste solder adds outer cylinder to by arm, by interior cylinder these solders is coated on the outer rim of rotating radiating fin then.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the embodiment schematic representation that the EGR gas quench system of radiator centre of the present invention is installed.
Fig. 2 is the partial sectional view of Fig. 1.
Fig. 3 is a manufacturing method of heat sink schematic representation among Fig. 1.
Fig. 4 is the schematic representation of circular groove on the pipe among Fig. 1.
Fig. 5 is an EGR gas quench system manufacture process schematic representation shown in Figure 2.
Fig. 6 is the formation method schematic representation of pipe circular groove among Fig. 1.
Fig. 7 is a radiating fin outer rim solder coating process schematic representation among Fig. 1.
Fig. 8 is pipe and an end plate assembling and positioning schematic representation among Fig. 1.
Fig. 9 is the sectional drawing of traditional E GR gas quench system.
Figure 10 is Fig. 9 spiral groove pipe spiral chute schematic representation.
Figure 11 is the radiating fin schematic representation among Fig. 9.
Shown in the figure:
23 radiator centres, 25,27 end plate 25a, 27a through hole
29 pipe 29b annular grooves, 31 radiating fin
Embodiment
With reference to Fig. 1,2, the EGR gas quench system comprises housing 11, housing 13 and built-in radiator centre 23.
The outer lateral section of hemisphere main casing 11b undergauge becomes cylindric, forms straight tube 11c in the outside.Be equipped with flange 15 on the straight tube 11c.The cylindrical of bobbin 11a processes through hole 11d towards hemisphere main casing 11b side.
The cooling water inlet pipe 17 of stainless steel material is installed on the through hole 11d.Bobbin 11a dorsad hemisphere main casing 11b mold enlarging structure 11e.Structure 11e forms the enlarging processing of bobbin 11a end.
The outer lateral section of hemisphere main casing 13b undergauge becomes cylindric, forms straight tube 13c in the outside.Be equipped with flange 19 on the straight tube 13c.The cylindrical of bobbin 13a processes through hole 13d towards hemisphere main casing 13b side.
The cooling water outlet pipe 21 of stainless steel material is installed on the through hole 13d.Housing 11 and housing 13 are to go up by the structure 11e that the top with the bobbin 13a of housing 13 is assemblied in housing 11 to constitute an integral body.
End plate the 25, the 27th, circular, its external diameter is littler than the internal diameter of bobbin 11a and bobbin 13a, and pipe 29 is assembled between the end plate 25,27.
On the border of the interior circle of the bobbin 11a of housing 11 and housing 11b, a whole shoulder 11f is shaped.By periphery and the shoulder 11f overlap joint with end plate 25, the location of realizing housing 11 and end plate 25.
On the border of the interior circle of the bobbin 13a of housing 13 and housing 13b, a whole shoulder 13f is shaped.By periphery and the shoulder 13f overlap joint with end plate 27, the location of realizing housing 13 and end plate 27.
In addition, in the end that the structure 11e of housing 11 is assembling housing 13, between the conical surface 11h of the end face of housing 13 and structure 11e, formed to adjusting the gap L of bobbin 11a and bobbin 13a axial length.And by this way end plate 25,27 is located on pipe 29.
The two ends of circular pipe 29 are configured as diameter reducing part 29a, and this diameter reducing part 29a is inserted among circular through hole 25a, the 27a on the end plate 25,27.And radiating fin 31 inserts in the pipe 29.Radiating fin 31 as shown in Figure 3, is twisted into helical to rectangle stainless steel plate 32 both sides and forms.
Radiating fin 31 two ends are positioned at 1 fixed position of two ends length L apart from pipe 29 as shown in Figure 2.Be formed with the circular groove 29b of temporary fixed radiating fin 31 at the cylindrical of pipe 29.Circular groove 29b axially forms a plurality of circular grooves with prescribed distance at pipe 29 as shown in Figure 4.
Above-mentioned EGR gas quench system manufacture process as shown in Figure 5.At first, shown in Fig. 5 a,, insert from structure 11e one side of housing 11 the radiator centre 23 that assembles in advance.
Attention is overlapped on the end plate 25 of radiator centre 23 on the shoulder 11f on the interior circle of housing 11, thereby makes radiator centre 23 one-sided location.Then, shown in (b), housing 13 is installed in radiator centre 23 opposite sides.Then as (c) shown in, on the shoulder 11e with the bobbin 13a one end insertion housing 11 of housing 13.
Then the end plate periphery with radiator centre 23 is overlapped on the shoulder 13f of housing 13, then as scheme shown in (d), respectively flange 15 and 19 is assemblied on the undergauge 13c of the undergauge 11c of housing 11 and housing 13; Cooling liquid inlet duct 17 is installed on the through hole 11d of housing 11, coolant outlet 21 is installed on the through hole 13d of housing 13.
The working principle of EGR gas quench system is as follows: from the waste gas circulation gas of vent systems is that flange 19 from the housing 13 flow to housing 13b, flow through again be arranged in the pipe 29 between fuse 23 end plates 25,27 and carry out the heat exchange cooling with cooling water from flow through cooling water inlet pipe 17 and outer pipe 21 after, housing 11b and the flange 15 through housing 11 enters suction tude then.
Fig. 6 is the roughly mould-forming method of circular groove on the pipe 29, and radiating fin 31 is inserted pipe 29, subsequently locating stud 33 is inserted pipe 29 two ends radiating fin 31 is positioned, shown in figure (a).
Adopt figure (b) with (c) shown in pressing mold 35 and be the cylindrical of axle compacting pipe 29 with radiating fin 31, shaping pipe 29 cylindrical circular groove 29b, and pipe 29 internal surfaces and radiating fin 31 are located.
Drift 36 is installed, utilize drift 36 to form in the end of curling die 35 simultaneously at pipe 29 end punching presses formation undergauge 29a and stage 29d.Before this, after paste solder is coated on the outer rim of radiating fin 31, radiating fin is inserted in the pipe 29, behind method shaping pipe 29 circular grooves mentioned above, in addition soldering of the circular groove on radiating fin 31 and the pipe 29.
Soldering is a critical process of making EGR gas system device radiation device fuse, and Fig. 7 be the method for radiator blade 31 cylindrical paste solders coating, in the peripheral disposition of radiating fin 31 the interior cylinder 37 made by carbamate with outside cylinder 39.
Paste solder adds outer cylinder 39 to by arm 41, by interior cylinder 37 these solders are coated on rotating radiating fin 31 outer rims then, Figure 8 shows that the assembling and positioning method of pipe 29 and end plate 25,27, the diameter shrinkage part 29a of pipe 29 is inserted through hole 25a, the 27a of end plate 25,27, make the inner side surface and the stage overlap joint of end plate, flaring die 43 is inserted diameter shrinkage part 29a, undergauge position 25a, 27a are carried out the enlarging operation or form flange 29c.
Flange 29c has eliminated the tediously long part of end plate 25,27 outside tube 29.The radiator centre of above-mentioned EGR gas quench system owing to have the circular trough 29b of temporary fixed radiating fin 31 and pipe 29, makes the gap of the annular groove 29b of pipe and radiating fin 31 outer rims little and even, guarantee radiating fin 31 reliably soldering in pipe 29.
Because the radiating fin 31 in the insertion pipe 29 are welded in the annular groove place in the pipe 29, make radiating fin 31 be fixed on the position of regulation in the pipe 29 easily and reliably, the heat transfer of radiating fin 31 is increased, and the turbulent flow of EGR gas stream obtains promoting, has improved heat exchange efficiency.
In the above-mentioned EGR gas quench system, because shell is divided into housing 11 and housing 13 2 parts, and carries out assembling and positioning with shoulder 11e, therefore, radiator centre 23 can easily be packed within the shell.In above-mentioned EGR gas quench system, because on the shoulder 11e of housing 11, have the gap L of adjusting housing 11 and housing 13 axial dimensions, the axial dimension error of radiator centre 23, housing 11, housing 13 just can be compensated when assembling shell 11 and housing 13.
Note above only being described, but the present invention is only limited to this form, as methods such as the also available rolling finishing circular groove 29b that is shaped with the example of curling die 35 at the outer surface shaping circular groove 29b of pipe 29.
Above do as a whole describing with cylindrical shell and housing.But the present invention is only limited to this kind form, and for example also can use housing and bobbin is the EGR gas quench system of separate part.
What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (8)
1. the radiator centre of gas recirculation system exhaust gas cooling device, configuration several pipes (29) between a pair of end plate (25,27), be provided with radiating fin (31) in the described pipe (29), it is characterized in that offering on the described pipe (29) annular groove (29b) of temporary fixed described radiating fin (31).
2. the radiator centre of gas recirculation system exhaust gas cooling device as claimed in claim 1, the end that it is characterized in that described pipe (29) is inserted in the last formed through hole (25a, 27a) of described end plate (25,27) by embedding, and the two ends of described radiating fin (31) are positioned the fixing length in two ends (L1) of the described pipe of distance (29).
3. the radiator centre of the gas recirculation system exhaust gas cooling device described in claim 1 or 2, it is characterized in that on the end of described pipe (29), forming diameter reducing part (29a), and this diameter reducing part (29a) is inserted in above-mentioned end plate (25,27) by embedding and goes up in the formed through hole (25a, 27a).
4. the radiator centre of gas recirculation system exhaust gas cooling device as claimed in claim 3 carries out the enlarging operation or forms flange (29c) undergauge position (29a).
5. the manufacture method of the radiator centre of gas recirculation system exhaust gas cooling device is characterized in that carrying out according to the following steps:
One, after the outer rim of radiating fin (31) is coated paste solder, insert in the pipe (29);
Two, go up formation annular groove (29b) at described pipe (29), make described radiating fin (31) therein temporary fixed;
Three, several two ends embeddings that install the pipe (29) of radiating fin (31) are inserted into through hole on a pair of end plate (25,27) (25a, 27a) in;
Four, mounted radiator centre (23) is carried out heat treated, the outer rim of described radiating fin (31) is soldered in the described pipe (29).
6. the manufacture method of the radiator centre of the egr gas cooling unit described in claim 5 is characterized in that the two ends of described radiating fin (31) are positioned the fixing length in two ends (L1) of the described pipe of distance (29).
7. the manufacture method of the radiator centre of the egr gas cooling unit described in claim 5, it is characterized in that: after described step 3 finishes, utilize drift (36) to go out diameter reducing part (29a) and stage (29d) in the end of pipe (29), and then with flaring die (43) end diameter of above-mentioned pipe (29) is enlarged or formation flange (29c) to reduce the gap.
8. the manufacture method of the radiator centre of the egr gas cooling unit described in claim 5, it is characterized in that described paste solder is the outer rim that is coated in described radiating fin (31) by the following method: the outer rim at described radiating fin (31) is symmetrically arranged with four applying devices, described each applying device comprises an arm (41), an outer cylinder (39) and an interior cylinder (37), paste solder adds outer cylinder (39) to by arm (41), by interior cylinder (37) these solders is coated on the outer rim of rotating radiating fin (31) then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100902435A CN1632300A (en) | 2004-10-28 | 2004-10-28 | Exhaust cooler core for exhaust gas recirculation system and method for making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004100902435A CN1632300A (en) | 2004-10-28 | 2004-10-28 | Exhaust cooler core for exhaust gas recirculation system and method for making same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1632300A true CN1632300A (en) | 2005-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100902435A Pending CN1632300A (en) | 2004-10-28 | 2004-10-28 | Exhaust cooler core for exhaust gas recirculation system and method for making same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1632300A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3741985A1 (en) * | 2019-05-23 | 2020-11-25 | Valeo Termico S.A. | An exhaust gas re-circulation (egr) cooler |
| CN115139098A (en) * | 2022-07-29 | 2022-10-04 | 东风马勒热系统有限公司 | Assembly tool and assembly method for core of exhaust gas recirculation cooler |
-
2004
- 2004-10-28 CN CNA2004100902435A patent/CN1632300A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3741985A1 (en) * | 2019-05-23 | 2020-11-25 | Valeo Termico S.A. | An exhaust gas re-circulation (egr) cooler |
| CN115139098A (en) * | 2022-07-29 | 2022-10-04 | 东风马勒热系统有限公司 | Assembly tool and assembly method for core of exhaust gas recirculation cooler |
| CN115139098B (en) * | 2022-07-29 | 2023-09-12 | 东风马勒热系统有限公司 | Assembly fixture and assembly method for exhaust gas recirculation cooler core |
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