• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for the manufacture of a heat exchanger for gases and heat exchanger for gases manufactured with the method. The method comprises fixing a structural member to one end of a casing (B) by directing a laser beam so that it impinges on surfaces to be welded of the casing (B) and of a projecting portion of the structural member extending outwardly with respect to the casing (B), so that the laser beam follows a straight path that comes from a point located inside a volume that surrounds the casing (B) between its opposite ends (Ba, Bb). The exchanger comprises a structural member having a projecting portion that extends outwardly with respect to the housing (B) and transversely with respect to a longitudinal axis thereof, and the exchanger has been manufactured in accordance with the method of the present invention. invention. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2677368A1
    申请号:ES201730108
    申请日:2017-01-31
    公开日:2018-08-01
    发明作者:Jesús JIMÉNEZ PALACIOS；Benjamín GRACIA LAZARO；Raúl ROMERO PÉREZ；Teresa CONTE OLIVEROS
    申请人:Valeo Termico SA；
    IPC主号:
    专利说明:

    METHOD FOR THE MANUFACTURE OF A HEAT EXCHANGER FORGASES AND HEAT EXCHANGER FOR GAS MANUFACTURED WITH THE5 METHOD
    Technical sector
    The present invention generally concerns, in a first aspect, a method for the
    Manufacture of a heat exchanger for gases, which comprises fixing a structural member to one end of a housing by means of a laser welding process, and more particularly to a method comprising directing a laser beam towards surfaces to be welded from one point above one side of the housing.
    A second aspect of the present invention concerns a heat exchanger manufactured according to the method of the first aspect.
    The invention is especially applied in exhaust recirculation exchangers of an engine ("Exhaust Gas Recirculation Coolers" or EGRC ».
    Prior art
    Methods for the manufacture of a gas heat exchanger are known in the prior art, especially for exhaust gases of an engine, which meet the characteristics of the preamble of claim 1 of the present invention, that is to say which heat exchanger comprises:
    - a hollow elongated body-shaped housing that extends along a longitudinal axis, and that is open at their respective opposite ends;
    30 - a first fluid circuit for the circulation of gases and a second fluid circuit for the circulation of a refrigerant fluid, in which the first and second fluid circuits are disposed within said housing for a heat exchange between said gases and said cooling fluid; Y
    - at least two structural members, each attached to a respective end of said
    opposite ends of the housing.
    Such methods known in the state of the art comprise fixing at least one of the two5 structural members cited to the respective end of the housing by means of a processlaser welding, in order to provide different types of welding joints
    Some of such known methods are described in the following patent documents: ES2269569T3, EP1518043B1 and DE19907163A1.
    10 The welding processes described in such documents are carried out from less advantageous locations (generally frontal, that is, from points that are not included in a volume surrounding the housing between its opposite ends), and / or include structural requirements (plates end support with bent end portions), dimensional
    15 (ratio of thicknesses) and assembly of the pieces to be joined, so that the welding joints are minimally robust, which cause that the welding processes cannot be carried out quickly, automatically and through sequences of movements simple, as well as a high cost in material when needing that the pieces are of a considerable thickness.
    Therefore, it is necessary to offer an alternative to the state of the art that provides a method of manufacturing a heat exchanger, and the heat exchanger obtained, which does not suffer from the drawbacks of those known in the state of the art, allowing to considerably increase the speed of the laser welding process of the
    25 pieces of the same and, therefore, to reduce the thickness of the pieces to be welded.
    Explanation of the invention.
    To this end, the present invention concerns, in a first aspect, a method for the manufacture of a heat exchanger for gases, especially for exhaust gases of an engine, in which the heat exchanger comprises:
    - a hollow elongated body-shaped housing that extends along a longitudinal axis, and that is open at their respective opposite ends; 35
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    - a first fluid circuit for the circulation of gases and a second fluid circuit for the circulation of a refrigerant fluid, wherein the first and second fluid circuits are arranged within said housing for a heat exchange between said gases and said cooling fluid; Y
    - at least two structural members, each attached to a respective end of said opposite ends of the housing.
    The method comprises, in a known manner, fixing at least one of the two structural members mentioned to the respective end of the housing by means of a laser welding process.
    Unlike the methods known in the state of the art, in that proposed by the first aspect of the present invention, at least one of the two structural members (preferably both) has a protruding portion that extends outwardly with respect to to the housing and transversely with respect to said longitudinal axis, and the method comprises performing the laser welding process by directing a laser beam so that it impacts on respective surfaces to be welded, both of the housing and of said projecting portion of the structural member, so that the laser beam follows a straight path that comes from a point within a volume that surrounds the housing between its opposite ends, that is, from a point located above one side of the housing.
    For a preferred embodiment, the method of the first aspect of the present invention comprises directing the laser beam, during the laser welding process, so that said straight path is inclined with respect to the longitudinal axis.
    Advantageously, the method comprises directing the laser beam, during the laser welding process, so that the straight path is inclined with respect to the longitudinal axis at an angle of between 20 and 75 °, preferably substantially 45 °.
    According to an example of embodiment, the surface to be welded of the housing is located in a region of a wall of the housing adjacent to the edge of the corresponding end thereof, and the method comprises controlling the energy and the time of application of the beam laser so that a welding bead is created that penetrates both said housing wall and said protruding portion to predetermined depths, without crossing them completely.
    According to an implementation of said embodiment, said structural member is an end support plate having a flat perimeter portion, and the method comprises supporting the housing, by the edge of its respective end, transversely against the portion
    5 flat perimeter of the end support plate, so that a portion of the portionflat perimeter defines the said outgoing portion, and then perform the process ofwelding .
    According to a variant of said implementation, the method of the first aspect of the invention
    10 comprises supporting the housing, by the edge of its respective end, orthogonally against the flat perimeter portion of the end support plate and then performing the welding process, in order to provide a T-joint.
    Advantageously, the thickness of said housing wall, in said region, and that of the
    15 flat perimeter portion of the end support plate are related by a thickness ratio of substantially 1: 1, always taking into account certain tolerance, for example ± 25%
    According to another embodiment, the surface to be welded from the housing is located in
    20 an area of a wall of the housing adjacent to an end portion thereof that includes one of its opposite ends, the method comprising controlling the energy and the time of application of the laser beam so as to create a weld bead that penetrates both in said housing wall and in said protruding portion to predetermined depths, without crossing them completely.
    25 According to an implementation of said exemplary embodiment, said structural member is a flange member having a through hole, in which a perimeter portion surrounding said through hole defines the previously called protruding portion, the method comprising introducing said portion tightly end of the housing in the aforementioned hole
    30 through, and then perform the welding process.
    Advantageously, the thickness of the perimeter portion of the flange member and that of the housing wall, in said area, are related by a thickness ratio included within a thickness ratio range ranging from substantially 1: 1 to
    35 substantially 2: 1.
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    The arrangement of the said protruding portion compensates for the phenomenon known as "shrinkage" (contraction) that some structural members suffer after undergoing one or more welding processes. In particular, when the structural member is said end support plate, and this is the plate on which the ends of some tubes of the first fluid circuit for gas circulation are welded, welding of such tube ends causes the cited "shrinkage" phenomenon, so that the fact that the end support plate includes the said protruding portion, defined by a respective flat perimeter portion (in all its contour), that is to say that its transverse dimension is greater than that of The casing makes that even if the transverse dimension of the plate contracts a little due to such a phenomenon, such contraction is not damaging either structurally or for the different welding joints, thus leaving the shrinkage phenomenon compensated.
    According to an embodiment of the method of the first aspect of the present invention, the structural member is an end support plate having a flat perimeter portion, and the method further comprises joining said end support plate to a tank of gas by means of an additional laser welding process, the method comprising arranging said flat perimeter portion of the end support plate against a flat perimeter portion of said gas tank, overlapping each other, and then performing the additional laser welding process.
    According to a first variant, said additional laser welding process comprises directing a laser beam so that it follows a straight path that comes from a point located within a volume that surrounds the housing between its opposite ends, to first strike a surface of the flat perimeter portion of the end support plate and then, controlling the energy and time of application of the laser beam, create a welding bead that completely crosses the flat perimeter portion of the end support plate and penetrates the portion flat perimeter of the gas tank to a predetermined depth.
    According to a second variant, the additional laser welding process comprises directing a laser beam so that it follows a straight path orthogonal to the aforementioned longitudinal axis and that comes from a point located above a limit contact area between the perimeter portions. flat, of the end support plate and of the gas tank, to simultaneously affect respective edges of said flat perimeter portions, and then, controlling the energy and the application time of the laser beam, create
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    a welding bead that penetrates both flat perimeter portions, to predetermined depths, without crossing them completely.
    For a third variant, part of the flat perimeter portion of the end support plate extends beyond the superimposed flat perimeter portion of the gas tank, and the additional laser welding process comprises directing a laser beam so that it follows a path inclined line with respect to the aforementioned longitudinal axis and which comes from a point located within a volume contiguous with said volume that surrounds the housing between its opposite ends, to simultaneously impact on a edge of the flat perimeter portion of the gas tank and on said part of the flat perimeter portion of the end support plate, and then, controlling the energy and time of application of the laser beam, create a weld bead that penetrates both flat perimeter portions, to predetermined depths, without crossing them completely.
    Advantageously, in relation to said third variant, the method of the first aspect of the present invention comprises directing the laser beam, during the additional laser welding process, so that said straight path is inclined with respect to the longitudinal axis at an angle of between 20 and 75 °, preferably substantially 45 °.
    Preferably, the parts to be welded together are made of the same material (or very similar materials), at least the housing and the structural member.
    Advantageously, said material is stainless steel, for example austenitic or ferritic.
    In order to perform the complete welding of the parts to be welded, the method of the first aspect of the present invention comprises performing the laser welding process and / or the additional laser welding process by relatively displacing the corresponding laser beam with respect to the respective parts to be welded, preferably in an automated manner, to be welded by a continuous welding bead (i.e. define a closed circuit), maintaining the orientation and length of the respective straight path of the laser beam with respect to the surfaces to be welded during cited displacement.
    Each of these displacements is associated with a really fast work cycle compared to the state of the art, which reduces the manufacturing cost both by reducing the work cycle time and by the amount of material needed to manufacture the pieces to be welded, these being, in general, of smaller thickness than those used in the state of the art, also providing more robust joints than those obtained in the state of the art.
    As regards the previously called point from which the laser beam comes,
    5 depending on the exemplary embodiment, it coincides directly with the location of the sourceof laser light (for example, a laser head) or with that of an addressing element of thelaser beam within an optical path that comes from the laser source, such as a prism or amirror of a galvanometric system.
    Also, the present invention also proposes, for an example of embodiment, for the previously described welding process and / or for the additional welding process, to carry out a monitoring of the respective welding bead being created (for example, with a remote camera system associated with image recognition techniques), in order to establish a closed-loop control of the laser beam, which allows a
    15 greater precision in addressing to absorb small variations in the position of the parts to be welded.
    A second aspect of the present invention concerns a heat exchanger for gases, especially for exhaust gases of an engine, which, in itself, comprises
    20 known:
    - a hollow elongated body-shaped housing that extends along a longitudinal axis, and that is open at their respective opposite ends;
    25 - a first fluid circuit for the circulation of gases and a second fluid circuit for the circulation of a refrigerant fluid, in which the first and second fluid circuits are arranged within said housing for a heat exchange between said gases and said cooling fluid; Y
    30-at least two structural members, each attached to a respective end of said opposite ends of the housing.
    Unlike the heat exchangers known in the state of the art, in that proposed by the second aspect of the present invention, at least one (preferably both) of the at least two structural members has a protruding portion that extends out with respect to the housing and transversely with
    with respect to the aforementioned longitudinal axis, and the heat exchanger has been manufactured according to the method of the first aspect of the present invention.
    According to an embodiment, the heat exchanger of the second aspect of
    The invention has been manufactured in accordance with the above-described embodiment of the method of the first aspect for which the laser beam was displaced relatively with respect to the respective parts to be welded to be welded by a continuous welding bead, the exchanger comprising, for a first implementation, a welding joint between the housing and the structural member that is formed by said continuous bead
    10 for welding, and, for a second implementation for which the structural member is an end support plate, a weld joint between the end support plate and the gas tank that is formed by said continuous welding bead.
    Brief description of the drawings
    15 The foregoing and other advantages and features will be more fully understood from the following detailed description of some embodiments with reference to the attached drawings, which should be taken by way of illustration and not limitation, in which:
    Figure 1 is an exploded perspective view showing the heat exchanger proposed by the second aspect of the invention, for an exemplary embodiment;
    Figure 2 illustrates the exchanger of Figure 1, once assembled;
    Figure 3 is a plan view of the exchanger illustrated in Figure 2;
    Figure 4 is an elevation view of a cross section of the exchanger of Figure 3, taken through a cutting plane as indicated by the line A-A in Figure 3;
    Figure 5 corresponds to an enlarged view of the detail indicated as O in Figure 4, the connection between the housing and the end support plate being illustrated;
    Figure 6 corresponds to an enlarged view of the detail indicated as E in Figure 4, the connection between the housing and the flange member being illustrated;
    Figures 7a, 7b and 7c are respective enlarged views of the detail indicated as H in
    Figure 4, illustrating the connection between the end support plate and the gas tank, for three corresponding alternative embodiments of the present invention.
    5 Detailed description of some embodiments
    Figures 1 to 4 illustrate the heat exchanger for gases proposed by the second aspect of the invention, manufactured according to the method of the first aspect, for an embodiment, for which it comprises:
    - a housing B with an elongated hollow body shape extending along an axis
    longitudinal, and which is open at their respective opposite ends Ba, Bb;
    - a first fluid circuit for the circulation of gases (illustrated in Figure 4, for a
    15 embodiment for which it is formed by a bundle of tubes T) and a second fluid circuit for the circulation of a refrigerant fluid, which enters through the inlet conduit R1 and exits through the outlet conduit R2, in which the first and second fluid circuits are arranged inside the housing B for a heat exchange between the gases and the cooling fluid;
    20-two end support plates P, each attached to a respective end of the ends
    opposite Ba, Bb of the housing B;
    - a gas tank G attached to one of the end support plates P; Y
    25 - a flange member F attached to an end portion of the housing B that includes the end Bb.
    The detail indicated as D in Figure 4 is illustrated in enlarged Figure 5, which shows the connection between the housing B and one of the end support plates P by a laser welding process.
    In particular, Figure 5 illustrates how the end support plate P has a flat perimeter portion Pc part of which defines a protruding portion, against which the edge e of the end Ba of the housing B is supported, according to the method of the first aspect of the invention, in this case orthogonally, after which the laser welding process has been carried out by directing a laser beam so that it impacts on respective surfaces to be welded, both of
    P2017301 08
    the housing B, in particular in a region of a wall of the housing B adjacent to the edge of the end Ba, as of the protruding portion of the end support plate P, controlling the energy and the application time of the laser beam so that the illustrated welding bead 51 is created, which penetrates both the wall of the housing S and the protruding portion defined by the flat perimeter portion Pc of the end support plate P to predetermined depths, without crossing them completely.
    The end support plate P includes, for some embodiments (as seen in Figures 5, 7a, 7b and 7c), one or more Z ribs (one continuous or several discontinuous, in both cases throughout the contour of the plate P) that is (s) fitted within the respective end of the housing S, in this case of the end B1, in order to facilitate the orthogonal positioning of the housing S against the end support plate P, and that both pieces do not separate before and during the welding process.
    In Figures 3 and 4 a laser head L 1 is schematically illustrated located at a point located within a volume surrounding the housing S between its opposite ends Ba, Bb, and responsible for generating the laser beam with which the welding is performed of Figure 5, which follows a straight inclined path with respect to the aforementioned longitudinal axis, according to the direction indicated by the arrow leaving the laser head L 1, with an inclination Y of between 20 and 75 °, preferably substantially 45 °.
    The orientation and length of the respective straight path of the laser beam with respect to the surfaces to be welded is not only maintained for the two positions illustrated by Figures 3 and 4, but throughout the relative displacement of the laser beam with respect to the respective parts to be welded (either by moving the head L 1 or the parts to be welded), to be welded by a continuous welding bead 51.
    For the embodiment illustrated by Figure 5, the thickness of the wall of the housing B, in said region, and that of the flat perimeter portion Pc of the end support plate P are related by a thickness ratio of substantially 1: 1, as indicated by the dimensions in the figure itself (for arbitrary units), both being of the same material (or very similar materials), and the width of the bead 51 at least equal to each of said thicknesses.
    In Figure 6, the detail indicated as E in Figure 4 is illustrated, enlarged, relative to the connection between the housing B and the flange member F.
    As illustrated in Figure 1, the flange member F has a through hole Fo in which a perimeter portion Fc surrounding the through hole Fo defines a protruding portion, the method of the first aspect of the invention comprising introducing said portion tightly end of the housing B in the through hole Fa, and then perform the laser welding process, in which the surface to be welded from the housing B is located in an area of a wall of the housing B adjacent to said end portion of the same.
    In relation to said welding process of the housing B to the flange member F, a laser head L2 is also schematically illustrated in Figures 3 and 4 located at a point located within a volume surrounding the housing B between its opposite ends Ba , Sb, and responsible for generating the laser beam with which the welding of Figure 6 is performed, which also follows a straight inclined path with respect to the aforementioned longitudinal axis, according to the direction indicated by the arrow leaving the laser head L2, with an X inclination of between 20 and 75 °, preferably substantially 45 °.
    For the welding of the housing S to the flange member F) the energy and the time of application of the incident laser beam leaving the head L2 is controlled, so that a welding bead S2 is created that penetrates both the wall of the housing S as in the perimeter portion Fc defining the protruding portion, up to predetermined depths, without crossing them completely, as illustrated in Figure 6. In this case, both the width and depth of the bead 82 are at least equal to thickness of the wall of the housing S, and the thickness of the perimeter portion Fc and that of the wall of the housing B, in said area, are related by a proportion of thicknesses included within a range of thickness proportion that goes from substantially 1: 1 to substantially 2: 1, both being made of the same material (or very similar materials).
    In the same way that for welding the housing S to the end support plate P, for welding the housing B to the flange member F, the laser beam is displaced, in this case the one emitted by the head L2, with with respect to the respective parts to be welded, to be welded by means of a continuous welding bead S2, maintaining the orientation and length of the respective straight path of the laser beam with respect to the surfaces to be welded during said displacement.
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    Finally, alternative embodiments of the welding of the end support plate P to the gas tank G are illustrated in Figures 7a, 7b and 7c, by respective enlarged views of the detail indicated as H in Figure 4.
    For the three exemplary embodiments illustrated in Figures 7a, 7b and 7c, the method of the first aspect of the invention comprises disposing the flat perimeter portion Pc of the end support plate P against a flat perimeter portion Gc of the gas tank G, overlapping each other, and then perform an additional laser welding process.
    The thicknesses of the flat perimeter portions Pc and Gc are related by a thickness ratio of substantially 1: 1, as indicated by the dimensions in the figure itself (for arbitrary units), both portions being of the same material (or very similar).
    For the embodiment of Figure 7a, said additional laser welding process comprises directing a laser beam so that it follows a straight path that comes from a point within a volume that surrounds the housing B between its opposite ends Ba, Bb ( and that in this case it follows a path parallel to the aforementioned longitudinal axis of the housing B), to first affect a surface of the flat perimeter portion Pc of the end support plate P and then, controlling the energy and the time of application of the laser beam, create a welding bead S3 that completely crosses the flat perimeter portion Pc of the end support plate P and penetrates the flat perimeter portion Gc of the gas tank G to a predetermined depth, which in this case includes as at least 80% of its thickness (as indicated by arbitrary unit 1.8 relative to the minimum depth of 83).
    As indicated in Figure 7a, the width of the bead S3 is at least equal to twice each of the thicknesses of the flat perimeter portions Pc and Gc.
    For the exemplary embodiment of Figure 7b, the additional laser welding process comprises directing a laser beam so that it follows a straight path orthogonal to the longitudinal axis of the housing B and that comes from a point located above a boundary area of contact between the flat perimeter portions Pc, Gc of the end support plate P and of the gas tank G, to simultaneously influence respective edges of the flat perimeter portions Pe, Gc and then controlling the energy and time of application of the laser beam, create a welding bead 84 that penetrates both flat perimeter portions Pc, Gc to predetermined depths, without crossing them completely. In this case, both the width and depth of the bead 84 is equal to at least each of the thicknesses of the flat perimeter portions Pc and Gc.
    With regard to the embodiment of Figure 7c, for this part of the portion
    5 flat perimeter Pc of the end support plate P extends beyond the superimposed flat perimeter portion Gc of the gas reservoir G, and the additional laser welding process comprises directing a laser beam so as to follow a straight path indicated with respect to to the longitudinal axis of the housing B (an angle between 20 and 75 °, preferably substantially 45 °) and that comes from a point located within a volume adjacent to the
    10 said volume surrounding the housing B between its opposite ends (ie, from the side of the gas tank G), to simultaneously affect a edge of the flat perimeter portion Gc of the gas tank G and on said part of the flat perimeter portion Pc of the end support plate P, and then, controlling the energy and time of application of the laser beam, create a welding bead 85 that penetrates both perimeter portions
    15 flat Pc, Gc to predetermined depths, without crossing them completely.
    In this case, both the width and depth of the bead S5 is equal to at least each of the thicknesses of the flat perimeter portions Pc and Gc.
    20 In the same way as it has been explained with reference to the welding beads 81 and 82, for the realization of the beads 83, 84 and 85 also relatively respective laser heads (not shown) are displaced with respect to the parts to be welded, so that such curbs 83, 84, 85 are continuous, that is to say they define respective closed circuits, maintaining during such displacements the orientation and length of the respective
    25 straight paths of the laser beams with respect to the surfaces to be welded.
    A person skilled in the art could introduce changes and modifications in the described embodiments without departing from the scope of the invention as defined in the appended claims.
    权利要求:
    Claims (21)
    [1]
    1.-Method for manufacturing a heat exchanger for gases, especially for exhaust gases of an engine, in which the heat exchanger comprises:
    - a housing (8) in the form of a hollow elongated body that extends along a longitudinal axis, and that is open at their respective opposite ends (8a, 8b);
    - a first fluid circuit for the circulation of gases and a second fluid circuit for
    10 the circulation of a refrigerant fluid, wherein the first and second fluid circuits are arranged within said housing (8) for a heat exchange between said gases and said refrigerant fluid; Y
    - at least two structural members, each attached to a respective end of said opposite ends (8a, 8b) of the housing (8),
    wherein the method comprises fixing at least one of said two structural members to said respective end of the housing (8) by means of a laser welding process,
    20 characterized in that at least one of said at least two structural members has a protruding portion that extends outwardly with respect to the housing (8) and transversely with respect to said longitudinal axis, and because the method comprises performing said laser welding process directing a laser beam so that it impacts on respective surfaces to be welded, both of the housing (8) and of said protruding portion of the
    25 structural member, so that said laser beam follows a straight path that comes from a point located within a volume that surrounds the housing (8) between its opposite ends (Ba, Bb).
    [2]
    2. Method according to claim 1, comprising directing said laser beam, during said
    30 laser welding process, so that said straight path is inclined with respect to said longitudinal axis.
    [3]
    3. Method according to claim 2, comprising directing said laser beam, during said laser welding process, so that said straight path is inclined with respect to said longitudinal axis at an angle of between 20 and 75 °.
    [4]
    4. Method according to claim 3, wherein said angle is substantially 4500 •
    [5]
    5. Method according to claim 2, 3 or 4, wherein said surface to be welded from the housing
    (B) is located in a region of a housing wall (B) adjacent to the edge of the end
    5 corresponding (Ba, Bb) thereof, where the method comprises controlling the energy andapplication time of said laser beam so that a welding bead is created (S1)which penetrates both said housing wall (B) and said projecting portion up topredetermined depths, without crossing them completely.
    6. Method according to claim 5, wherein said structural member is an end support plate (P) having a flat perimeter portion (Pe), wherein the method comprises supporting the housing (B), by the edge ( C) of its respective end (Ba, Bb), transversely against said flat perimeter portion (Pe) of the end support plate (P), so that a part of the flat perimeter portion (Pe) defines said protruding portion, since continuation
    15 perform the welding process.
    [7]
    Method according to claim 6, which comprises supporting the housing (B), by the edge (C) of its respective end (Ba, Bb), orthogonally against the flat perimeter portion (Pc) of the end support plate ( P) and then perform the welding process, in order
    20 of providing a T-junction.
    [8]
    8. A method according to claim 6 or 7, wherein the thickness of said housing wall (B), in said region, and that of the flat perimeter portion (Pe) of the end support plate (P) are related by a thickness ratio of substantially 1: 1.
    [9]
    9. Method according to claim 2, 3 or 4, wherein said surface to be welded from the housing
    (B) is located in an area of a wall of the housing (B) adjacent to an end portion thereof that includes one of said opposite ends (Ba, Bb), the method comprising controlling the energy and the application time of said laser beam so that a
    30 welding bead (S2) that penetrates both said housing wall (B) and said protruding portion to predetermined depths, without crossing them completely.
    [10]
    10. Method according to claim 9, wherein said structural member is a flange member (F) having a through hole (Fo), in which a perimeter portion (Fe)
    35 surrounding said through hole (Fo) defines said protruding portion, the method comprising
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    tightly insert said end portion of the housing (B) into said through hole (Fo), and then perform the welding process.
    [11]
    11. Method according to claim 9 or 10, wherein the thickness of the perimeter portion (Fe) of the flange member (F) and that of said housing wall (B), in said area, are related by a thickness ratio included within a thickness ratio range ranging from substantially 1: 1 to substantially 2: 1.
    [12]
    12. Method according to claim 2, 3 or 4, wherein said structural member is an end support plate (P) having a flat perimeter portion (Pe), and in which the method further comprises joining said plate of extreme support (P) to a gas tank (G) by means of an additional laser welding process, the method comprising arranging said flat perimeter portion (Pe) of the end support plate (P) against a flat perimeter portion ( Gc) of said gas tank (G), overlapping each other, and then performing said additional laser welding process.
    [13]
    13. Method according to claim 12, wherein said additional laser welding process comprises directing a laser beam so that it follows a straight path that comes from a point located within a volume surrounding the housing (B) between its ends opposite (Ba, Bb), to first hit a surface of the flat perimeter portion (Pe) of the extreme support plate (P) and then, controlling the energy and the time of application of the laser beam, create a bead welding (S3) that completely crosses the flat perimeter portion (Pc) of the end support plate (P) and penetrates the flat perimeter portion (Gc) of the gas tank (G) to a predetermined depth.
    [14]
    14. Method according to claim 12, wherein said additional laser welding process comprises directing a laser beam so that it follows a straight orthogonal path to said longitudinal axis and that comes from a point located above a contact limit area between the flat perimeter portions (Pe, Gc) of the end support plate (P) and the gas tank (G), to simultaneously influence respective edges of said flat perimeter portions (Pe, Gc) and then controlling energy and time
    of laser beam application, createawelding bead (S4) that penetratesinboth
    portions perimeterflat(Pe,Gc)untildepthsdefaultace,without
    go through them completely.
    [15]
    15. Method according to claim 12, wherein part of the flat perimeter portion (Pe) ofthe end support plate (P) extends beyond the flat perimeter portionsuperimposed (Gc) of the gas tank (G), and in which said additional welding processlaser comprises directing a laser beam so that it follows a straight path indicated with5 with respect to said longitudinal axis and that comes from a point located within a volumeadjacent to said volume surrounding the housing (B) between its opposite ends, to influencesimultaneously on a edge of the flat perimeter portion (Gc) of the gas tank (G)and on said part of the flat perimeter portion (Pc) of the end support plate (P), andthen, controlling the energy and the time of application of the laser beam, create a bead
    10 of welding (S5) that penetrates both flat perimeter portions (Pe, Gc) to predetermined depths, without crossing them completely.
    [16]
    16. Method according to claim 15, which comprises directing said laser beam, during said additional laser welding process, so that said straight path is inclined with respect to the longitudinal axis at an angle of between 20 and 75 °.
    [17]
    17. Method according to claim 16, wherein said angle is substantially 45 °.
    [18]
    18. Method according to any one of the preceding claims, wherein at least said housing (B) and the structural member are made of the same material.
    [19]
    19. Method according to claim 18, wherein said material is stainless steel.
    [20]
    20.-Method according to any one of the preceding claims, which comprises performing
    25 said laser welding process and / or said additional laser welding process by relatively displacing said laser beam with respect to the respective parts to be welded, to be welded by a continuous welding bead (S1, S2, S3, S4, S5), maintaining the orientation and length of the respective straight path of the laser beam with respect to the surfaces to be welded during said displacement.
    [21 ]
    21.-Heat exchanger for gases, especially for exhaust gases of an engine, comprising:
    - a housing (B) in the form of a hollow elongated body that extends along a longitudinal axis 35, and which is open at their respective opposite ends (Ba, Bb);
    - a first fluid circuit for the circulation of gases and a second fluid circuit for
    the circulation of a refrigerant fluid, wherein the first and second fluid circuits are disposed within said housing (B) for a heat exchange between said gases and said refrigerant fluid; Y
    - at least two structural members, each attached to a respective end of said opposite ends of the housing (B),
    characterized in that at least one of said at least two structural members has
    10 a projecting portion extending outwardly with respect to the housing (B) and transversely with respect to said longitudinal axis, and because the heat exchanger has been manufactured according to the method according to any one of the preceding claims.
    22. Heat exchanger according to claim 21, manufactured according to the method of claim 20, comprising a welding joint between the housing (B) and the structural member, which is formed by said continuous welding bead ( S1, S2).
    [23]
    23. Heat exchanger according to claim 21, manufactured according to the method
    20 of claim 20, wherein the structural member is an end support plate (P) and the heat exchanger comprises a weld joint between the end support plate (P) and the gas tank (G), which it is formed by said continuous welding bead (S3, S4, S5).
    24. Exchanger according to any one of claims 21 to 23, wherein the end support plate (P) includes one or more ribs (Z) arranged to be inserted and fitted within the respective end (Ba, Bb) of the housing (B).
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    同族专利:
    公开号 | 公开日
    WO2018141807A1|2018-08-09|
    ES2677368B1|2019-05-14|
    EP3576900A1|2019-12-11|
    KR20190113862A|2019-10-08|
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    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201730108A|ES2677368B1|2017-01-31|2017-01-31|METHOD FOR THE MANUFACTURE OF A HEAT EXCHANGER FOR GASES AND HEAT EXCHANGER FOR GASES MANUFACTURED WITH THE METHOD|ES201730108A| ES2677368B1|2017-01-31|2017-01-31|METHOD FOR THE MANUFACTURE OF A HEAT EXCHANGER FOR GASES AND HEAT EXCHANGER FOR GASES MANUFACTURED WITH THE METHOD|
    KR1020197025174A| KR20190113862A|2017-01-31|2018-01-31|A method of manufacturing a gas heat exchanger and a gas heat exchanger produced by the method|
    PCT/EP2018/052429| WO2018141807A1|2017-01-31|2018-01-31|Method for making a heat exchanger for gases and heat exchanger for gases made by said method|
    EP18702683.6A| EP3576900A1|2017-01-31|2018-01-31|Method for making a heat exchanger for gases and heat exchanger for gases made by said method|
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