CN220452059U - Heat exchange tube core fixing structure of EGR cooler - Google Patents
Heat exchange tube core fixing structure of EGR cooler Download PDFInfo
- Publication number
- CN220452059U CN220452059U CN202321836711.3U CN202321836711U CN220452059U CN 220452059 U CN220452059 U CN 220452059U CN 202321836711 U CN202321836711 U CN 202321836711U CN 220452059 U CN220452059 U CN 220452059U
- Authority
- CN
- China
- Prior art keywords
- tube
- heat exchange
- tube core
- shell
- core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000008602 contraction Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract description 2
- 238000005219 brazing Methods 0.000 description 13
- 238000003466 welding Methods 0.000 description 10
- 239000000110 cooling liquid Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The utility model relates to a heat exchange tube core fixing structure of an EGR cooler, which comprises the following components: the inlet chamber, heat transfer tube core, the air outlet chamber that connect gradually, the heat transfer tube core includes: tube sheet, tube shell, heat exchange tube bank, tube shell both ends side are set up intake chamber and apopore according to the diagonal, are equipped with two piece at least face shapes and surpass the tube core fixed plate of tube shell cross-section shape half in the tube shell, are equipped with the through-hole that can pass the tube bank on the tube core fixed plate, and each through-hole and tube bank welded fastening that pass the tube bank. In order to improve the strength of the heat exchange tube core structure of the EGR cooler, the tube core fixing plate for fixing the tube bundles of the heat exchange tubes is arranged in the tube shell, the tube core fixing plate is provided with the through holes matched with the tube bundles, the tube bundles are welded and fixed with the through holes, and the tube core fixing plate is welded and fixed with the tube shell, so that the fixing of the heat exchange tube core is realized, the heat expansion and contraction degrees of the shell and the heat exchange core are different when the cooler works, the axial stress is generated on the shell or the heat exchange core, and the risk of water-gas communication is reduced.
Description
Technical Field
The utility model relates to a heat exchange tube core fixing structure of an EGR cooler, which is an accessory for automobile environment protection and is a heat exchanger used for automobile exhaust gas recirculation EGR.
Background
EGR coolers an apparatus for rapidly cooling hot exhaust gases from an engine in an EGR system, typically in the form of tube bundles and fins. The two ends of the heat exchange tube core (the tube bundle consisting of a plurality of parallel straight tubes) of the tube bundle cooler are respectively welded on tube plates at the two ends, and the tube plates are welded with tube shells with the same length as the tube cores, namely, the tube plates restrict the lengths of the tube cores and the tube shells. In general, the material of the package and the die is the same, and the thermal expansion coefficient is the same. The working principle of the EGR cooler is that hot waste gas discharged by the engine in the tube bundle flows in the tube shell, and the engine coolant in the tube shell exchanges heat with the hot gas in the tube bundle to cool the waste gas. Due to the effect of the cooling liquid, the temperature of the tube shell is lower than 110 ℃ (lower than the boiling point of the cooling liquid), and the temperature of the tube core is high in the range of 300-800 ℃, so that the thermal expansion difference occurs between the tube shell and the tube core. When the length difference of the tube shell and the tube core is smaller, the thermal expansion difference is not obvious, but when the length of the tube shell and the tube core is longer, the tube core generates thermal deformation under the influence of high-temperature waste gas for a long time, and along with the stress concentration generated at the welding seam of the tube plate and the tube core and the vibration influence of the engine, the repeated action finally causes cracks and cracking at the welding seam of the tube plate and the heat exchange tube due to fatigue, the structure is invalid, so that the water and air are communicated, and when cooling liquid enters an exhaust gas circulation channel and enters an engine cylinder, the damage such as cylinder pulling is caused, so that the engine cannot normally run. How to avoid shaking and cracking of the tube core is a problem to be solved.
Disclosure of Invention
In order to overcome the problems in the prior art, the utility model provides a heat exchange tube core fixing structure of an EGR cooler. The fixing structure is arranged in the tube shell, so that the degree of expansion caused by heat and contraction caused by cold of the shell and the heat exchange core is different when the cooler works, axial stress is generated on the shell or the heat exchange core, and meanwhile, the tube core is fixed, the tube core is prevented from shaking and cracking, and the service life of the cooler is prolonged.
The purpose of the utility model is realized in the following way: an EGR cooler heat exchange tube core fixing structure comprising: the inlet chamber, heat exchange tube core, the room of giving vent to anger that connect gradually, the heat exchange tube core include: tube sheet, tube shell, heat exchange tube bank, tube shell both ends side set up intake chamber and play water chamber according to the diagonal, the tube shell in be equipped with two piece at least block plate face shape and surpass the tube core fixed plate of half of tube shell cross-section shape, the tube core fixed plate on be equipped with the through-hole that can pass the tube bank, each through-hole and tube bank welded fastening that passes the tube bank, each tube core fixed plate crisscross welded fastening in the tube shell, with intake chamber, go out the adjacent tube core fixed plate of water chamber and intake chamber or play water chamber homonymy.
Furthermore, the three sides of the tube core fixing plate are provided with flanges welded and fixed with the tube shell.
Furthermore, round corners are arranged on two sides of the flanging.
The utility model has the advantages and beneficial effects that: in order to improve the strength of the heat exchange tube core structure of the EGR cooler, the tube core fixing plate for fixing the tube bundles of the heat exchange tubes is arranged in the tube shell, the tube core fixing plate is provided with the through holes matched with the tube bundles, the tube bundles are welded and fixed with the through holes, and the tube core fixing plate is welded and fixed with the tube shell, so that the fixing of the heat exchange tube core is realized, the heat expansion and contraction degrees of the shell and the heat exchange core are different when the cooler works, the axial stress is generated in the shell or the heat exchange core, and the risk of water-gas communication of the heat exchange tube core is reduced. The tube core fixing plate also has a diversion effect, can guide the cooling liquid to flow in a tortuous way in the tube shell, avoids the dead zone of the cooling liquid, and improves the cooling efficiency.
Drawings
The utility model is further described below with reference to the drawings and examples.
FIG. 1 is a schematic view of a fixing structure according to an embodiment of the present utility model;
FIG. 2 is a schematic view of the fixing structure according to the embodiment of the present utility model, and is a cross-sectional view taken along A-A in FIG. 1;
fig. 3 is a perspective view of the die attach pad according to an embodiment of the present utility model.
Detailed Description
Embodiment one:
this embodiment is an EGR cooler heat exchange tube core fixing structure, as shown in fig. 1, 2, and 3. The embodiment comprises the following steps: the inlet chamber 1, heat exchange tube core 2, the room of giving vent to anger 3 that connect gradually, the heat exchange tube core include: tube sheet 201, tube shell 202, heat exchange tube bundle 203, tube shell both ends side set up intake chamber 4 and play hydroecium 5 according to the diagonal, the tube shell in be equipped with two piece at least block face shapes and surpass the tube core fixed plate 6 of half of tube shell cross-section shape, the tube core fixed plate on be equipped with the through-hole 601 that can pass the tube bank, each through-hole and tube bank welded fastening that passes the tube bank, each tube core fixed plate crisscross welded fastening in the tube shell, with intake chamber, go out the adjacent tube core fixed plate of hydroecium and intake chamber or play hydroecium homonymy.
The EGR cooler of this embodiment is generally configured as a straight tube cooler in a long strip shape, two ends of a long tube core are an intake chamber and an outlet chamber, a heat exchange tube core is arranged in the middle, and two ends of the heat exchange tube core are diagonally provided with an intake chamber and an outlet chamber. The heat exchange core consists of tube plate (one of inlet and outlet ends), heat exchange tube bundle (multiple heat exchange tubes), tube shell and tube core fixing plate.
The tube core fixing plate is a plate-shaped part, and the plate surface is provided with a through hole. The outer edge shape of the die-fixing plate is consistent with the cross-sectional shape of the tube shell, but only covers half of the cross-section of the tube shell, for example: the tube shell is circular in cross-section, the tube core fixing plate is semicircular, and if the tube shell is rectangular in cross-section, the tube core fixing plate is half of the rectangle, as shown in fig. 1 and 2. The tube core fixing plate adopts half of the cross section shape of the tube shell to enable the cooling liquid to pass through and generate a curve flowing effect of the cooling liquid, and therefore, a plurality of tube core fixing plates are fixed in the tube shell in a staggered mode. The meaning of staggering is: if one die-retention plate is mounted on the left side, the next die-retention plate is mounted on the right side. Since the water inlet and outlet chambers of the cooler are diagonally installed, the positions of the water inlet and outlet chambers need to be considered when the die fixing plate is installed, so that the cooling liquid flows in a curve without dead angles, as shown by an arrow B in FIG. 1.
The tube core fixing plate is assembled and welded with the heat exchange tube bundle and is simultaneously bonded and welded with the tube shell, so that the heat exchange tube bundle and the tube shell are fixedly connected, the distance between adjacent heat exchange tubes of the heat exchange tube bundle is restrained, the heat exchange tube core is fixed, the natural frequency of the tube core is integrally increased, and the damage influence of engine vibration on the heat exchange tube core is reduced. The plate surface of the heat exchange tube core fixing plate is provided with a plurality of through holes matched with the heat exchange tubes, and the through holes are used for being inserted into the tube bundles and welded with the tube bundles into a whole, as shown in figures 1 and 2. The tube core fixing plate is manufactured into a structure attached to the tube shell in a bending mode and the like and is welded with the tube shell into a whole, so that the heat exchange tube core is fixed on the tube shell, and the tube shell is connected and fixed with the air inlet chamber and the air outlet chamber of the cooler, so that firm support of the tube shell on the tube bundle is formed.
The heat exchange tube fixing plate is punched with a perforation of the cross section shape of the heat exchange tube by using a sheet material in a stamping forming mode, is used for inserting and assembling the heat exchange tube, and is provided with three wings with three edges bent (flanging) to form an obtuse angle state, and is used for being bonded and welded with a tube shell, so that the requirement of assembling and bonding the heat exchange tube fixing plate and a connected piece is formed conveniently. The middle plate of the tube core fixing plate is punched with through holes corresponding to the shape of the heat exchange tubes and used for inserting the heat exchange tubes and fixing the relative positions between adjacent heat exchange tubes.
The cross section shape of the tube core fixing plate for penetrating the heat exchange tube is not limited, if the heat exchange tube is round, the through hole is a round hole, and the through hole can also be elliptic, regular polygon or the like.
The through holes on the tube core fixing plate are matched with the cross section of the heat exchange tube in size, the heat exchange tube is in clearance fit suitable for brazing, and the heat exchange tube is inserted into the heat exchange tube core fixing plate and is fixed in a brazing mode after being assembled.
The heat exchange tube fixing plate is coated with brazing filler metal in advance and dried, then is assembled and welded with the tube shell in a tool positioning and resistance welding mode, and is welded with the tube shell to form a component, and then the component is assembled with the heat exchange tube, so that smooth assembly of the heat exchange tube core is realized, dislocation of a vacancy of the heat exchange tube core fixing plate and a tube hole is avoided, and the welding rate of the heat exchange tube core fixing plate and the tube bundle is improved.
In the brazing process of the tube core fixing plate and the heat exchange tube, after the printing brazing filler metal is smeared on the tube core fixing plate in advance, the heat exchange tube is inserted into the tube core fixing plate, and a semi-finished product or a finished product is assembled and then enters a brazing furnace for brazing. Or the heat exchange tube is filled into the heat exchange tube core fixing plate and then coated with brazing filler metal, and the heat exchange tube core fixing plate is assembled into a semi-finished product or a finished product and then enters a brazing furnace for brazing. The heat exchange tube fixing plate and the tube shell assembly are inserted into the heat exchange tube bundle and the assembly of the heat exchange core body is completed, and finally the assembly of the EGR cooler and the integral brazing are completed, so that the production and assembly process of the mass production and assembly of products is realized.
The flanges on the two sides of the tube core fixing plate are in interference fit with the inner outline dimension of the tube shell so as to be welded seamlessly. In the assembling and welding process of the tube core fixing plate and the tube shell, the heat exchange tube core fixing plate is positioned and welded on the tube shell through a resistance spot welding tool, and then the tube core fixing plate is inserted into the heat exchange tube bundle for brazing. The tube core fixing plate and the tube shell are fixed in a welding mode, the tube core fixing plate is positioned by adopting a fixture in advance, the tube core fixing plate coated with the solder is welded to the tube shell in a resistance mode, and the relative position of the tube core fixing plate and the tube shell is positioned.
The three flanging edges of the tube core fixing plate are obtuse angles with the middle flat plate. The tube core fixing plate is made of materials which are suitable for being used in a cooling liquid environment and can be welded with the heat exchange tube core and the tube shell. The wall thickness of the tube core fixing plate is larger than the wall thickness of the heat exchange tube, and the structural strength is higher than that of the heat exchange tube core so as to play a role in fixing the heat exchange tube.
Embodiment two:
this embodiment is a modification of the first embodiment, and is a refinement of the first embodiment with respect to the die-attach pad. The die attach pad of this embodiment has three sides provided with flanges 602, 603, 604 that are welded to the package as shown in fig. 3.
The die fixing plate and the tube shell can be fixedly connected by adopting brazing, resistance welding or laser welding. In order to make welding firm, a flanging structure can be adopted, namely bending is arranged on the outer edges of three tube shells to be connected of the tube core fixing plate, and as shown in fig. 3, the tube core fixing plate is connected with the surface of the tube shells.
Embodiment III:
this embodiment is a modification of the above embodiment, and is a refinement of the above embodiment with respect to the flap. Rounded corners 605 are arranged on two sides of the flanging in the embodiment, as shown in fig. 3.
The three side surfaces of the outer edge of the tube core fixing plate are respectively provided with a flanging, and the direct parts of the three flanging are provided with round corners so as to avoid collision and blockage in the installation process.
Finally, it should be noted that the above is only intended to illustrate the technical solution of the present utility model and not to limit it, and although the present utility model has been described in detail with reference to the preferred arrangement, it will be understood by those skilled in the art that modifications and equivalent substitutions can be made to the technical solution of the present utility model (such as the basic form of the cooler, the mounting means of the die-attach plate, etc.), without departing from the spirit and scope of the technical solution of the present utility model.
Claims (3)
1. An EGR cooler heat exchange tube core fixing structure comprising: the inlet chamber, heat exchange tube core, the room of giving vent to anger that connect gradually, the heat exchange tube core include: tube sheet, tube shell, heat exchange tube bank, tube shell both ends side set up intake chamber and play hydroecium according to the diagonal, its characterized in that, the tube shell in be equipped with two piece at least block face shapes and surpass the tube core fixed plate of half of tube shell cross-section shape, the tube core fixed plate on be equipped with the through-hole that can pass the tube bank, each through-hole and tube bank welded fastening that passes the tube bank, each tube core fixed plate crisscross welded fastening in the tube shell, the tube core fixed plate and intake chamber or play hydroecium homonymy adjacent with intake chamber, play hydroecium.
2. The die attach structure of claim 1 wherein said die attach plate has three sides provided with flanges for welded attachment to the package.
3. The die attach structure of claim 2, wherein rounded corners are provided on both sides of the flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321836711.3U CN220452059U (en) | 2023-07-13 | 2023-07-13 | Heat exchange tube core fixing structure of EGR cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321836711.3U CN220452059U (en) | 2023-07-13 | 2023-07-13 | Heat exchange tube core fixing structure of EGR cooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220452059U true CN220452059U (en) | 2024-02-06 |
Family
ID=89739972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321836711.3U Active CN220452059U (en) | 2023-07-13 | 2023-07-13 | Heat exchange tube core fixing structure of EGR cooler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220452059U (en) |
-
2023
- 2023-07-13 CN CN202321836711.3U patent/CN220452059U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8002022B2 (en) | Heat exchanger, in particular exhaust gas heat exchanger for motor vehicles | |
| US8069912B2 (en) | Heat exchanger with conduit surrounded by metal foam | |
| CN100425937C (en) | Heat exchanger | |
| US20060048921A1 (en) | Fin structure, heat-transfer tube having the fin structure housed therein, and heat exchanger having the heat-transfer tube assembled therein | |
| US20100025024A1 (en) | Heat exchanger and method | |
| EP1996891B1 (en) | Heat exchanger for egr-gas | |
| EP2171246B1 (en) | Method of producing heat exchanger | |
| US4428418A (en) | Heat exchanger fin element with folded over side edges | |
| KR20100051098A (en) | Heat exchanger, particularly for a motor vehicle | |
| WO2011143515A2 (en) | Heat exchanger tank and related methods and apparatuses | |
| US20070000652A1 (en) | Heat exchanger with dimpled tube surfaces | |
| CN101410688A (en) | Method of manufacturing metallic foam based heat exchanger | |
| US20120199328A1 (en) | Heat Exchanger Comprising a Tubular Element and a Heat Transfer Element | |
| JP2008202846A (en) | Heat transfer tube for heat exchanger and egr gas cooling device using the same | |
| US9016357B2 (en) | Header plate and heat exchanger comprising same | |
| JP2007155321A (en) | Small high-temperature heat exchanger such as recovery heat exchanger | |
| CN220452059U (en) | Heat exchange tube core fixing structure of EGR cooler | |
| US20070131400A1 (en) | Heat exchanger for gases, especially for engine exhaust gases | |
| CN111810323B (en) | Exhaust gas recirculation cooler | |
| US20160208746A1 (en) | Heat exchanger | |
| RU2576728C1 (en) | Radiator for cooling system of internal combustion engine | |
| US20060048930A1 (en) | Heat exchanger | |
| CN215864785U (en) | Clamping piece type heat exchanger | |
| WO2011103574A2 (en) | Heat exchanger fins, assemblies and methods | |
| EP4012317B1 (en) | A water charge air cooler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |