JP5961594B2 - Flat plate heat exchanger and manufacturing method of flat plate heat exchanger - Google Patents

Description

  The present invention relates to a flat plate heat exchanger and a method of manufacturing a flat plate heat exchanger.

Conventionally, a flat plate heat exchanger is formed by pressing a part of a flow path of a heat transfer plate to form an uneven portion, overlapping the heat transfer plates, and using the uneven portion as a flow path and a heat transfer portion. In this configuration, the overlapping surfaces are brazed and joined. For this reason, the manufacture of a large flat plate heat exchanger requires a large press machine. Furthermore, the change of the flow path shape requires a new press die, which entails a great investment in equipment. In addition, a brazing process is required, and labor and time are required.
Then, the technique which aims at the improvement of a brazing process and reduces the manufacturing cost of a flat plate type heat exchanger is proposed (patent document 1).

  In the technique described in Patent Document 1, the planar shape of the heat transfer plate on which the continuous uneven surface is formed is formed into a circular shape or a polygonal shape that is rotated by 90 degrees, and is rotated 90 degrees from the center of the heat transfer plate. Openings are provided at two locations, and a plurality of heat transfer plates are rotated 90 degrees each time and stacked. A rod-shaped brazing material is inserted into the opening groove formed between the outer edges of the stacked heat transfer plates, and each heat transfer A sheet-like brazing material is laid between the plates and heated in an electric furnace for brazing and joining.

JP 2000-161877 A

  However, in the technique of Patent Document 1, since the heat transfer plate is formed by press processing, a large heat transfer plate is required to manufacture a large heat transfer plate, and there is room for improvement in reducing the manufacturing cost. .

  An object of this invention is to provide the manufacturing method of the flat plate type heat exchanger which does not require press work, and a flat plate type heat exchanger in view of the said fact.

  In order to achieve the above object, a method for manufacturing a flat plate heat exchanger according to claim 1 is a powder filling in which a metal powder is filled between a metal first flat plate and a second flat plate arranged opposite to each other. And the first flat plate, the second flat plate, and the metal powder from the outside of the first flat plate or the second flat plate in a state where the metal powder is in contact with the first flat plate and the second flat plate. Is irradiated with a high energy beam to melt a part of the first flat plate, a part of the second flat plate, and a part of the metal powder to produce a melt. And a welding step of forming a flow path wall between the first flat plate and the second flat plate by solidification to obtain a flow path and a heat transfer section of the flat plate heat exchanger.

  According to this flat plate type heat exchanger manufacturing method, the flow path wall is integrally formed between the metal first flat plate and the second flat plate arranged opposite to each other. In addition, the channel wall is made of metal because it is formed of a melt of metal powder. Moreover, since this flow path wall is formed by irradiating the high energy beam toward the first flat plate, the second flat plate, and the metal powder from the outside of the first flat plate or the second flat plate, the flat plate type Even if the heat exchanger is large or small, the flow path wall can be formed. As a result, a metal flat plate heat exchanger can be manufactured without requiring pressing.

  The manufacturing method of the flat plate type heat exchanger according to claim 2 is characterized in that, in the welding step of the manufacturing method of the flat plate type heat exchanger according to claim 1, the first flat plate, the second flat plate, and the metal powder. The flow path wall is formed along the relative movement direction of the high energy beam by relatively moving the high energy beam.

  According to this flat plate heat exchanger manufacturing method, the high energy beam is relatively moved with respect to the first flat plate, the second flat plate and the metal powder, and the flow path wall along the relative moving direction of the high energy beam. Therefore, a continuous flow path wall can be formed in the relative movement direction of the high energy beam.

  According to a third aspect of the present invention, there is provided a method for manufacturing a flat plate heat exchanger, wherein the first flat plate is irradiated with the high energy beam in the welding step of the flat plate heat exchanger manufacturing method according to the second aspect. Forming a molten pool as the molten material in a part of the second flat plate and a part of the metal powder, and relatively moving the high energy beam while forming a keyhole in the molten pool It is a method to make it.

  According to this flat plate heat exchanger manufacturing method, a high energy beam is formed while forming a keyhole in a molten pool formed in a part of the first flat plate, a part of the second flat plate, and a part of the metal powder. Relative movement. Therefore, since the high energy beam can reach a deep position through the keyhole, a flow path wall can be formed between the first flat plate and the second flat plate.

  The flat plate heat exchanger manufacturing method according to claim 4 is the welding step of the flat plate heat exchanger manufacturing method according to any one of claims 1 to 3, wherein the high energy beam In a state where the focal point is set at any position from the outer surface of the first flat plate or the second flat plate to the inside of the metal powder, the first flat plate or the second flat plate is exposed from the outside. In this method, the high energy beam is irradiated toward the flat plate, the second flat plate, and the metal powder.

  According to this flat plate heat exchanger manufacturing method, the focal point of the high energy beam is set at any position from the outer surface of the first flat plate or the second flat plate to the inside of the metal powder. A part of the second flat plate and a part of the metal powder can be effectively melted to generate a melt. Thereby, the flat plate located on the irradiation side of the high energy beam, the metal powder, and the flat plate located on the opposite side of the irradiation side are melted to form a flow path wall between the first flat plate and the second flat plate. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the flat plate heat exchanger which does not require press work, and a flat plate type heat exchanger can be provided.

(A) is a perspective view which shows the basic composition of the flat plate type heat exchanger which concerns on 1st Embodiment of this invention, (B) is the X1-X1 line | wire partial sectional view of FIG. 1 (A). It is a front view showing an example of development of a flat plate type heat exchanger concerning a 1st embodiment of the present invention. It is a perspective view of the multilayer heat exchanger which combined the flat plate type heat exchanger which concerns on 1st Embodiment of this invention. (A)-(C) are perspective views explaining the manufacturing apparatus and manufacturing method of the flat plate type heat exchanger which concern on 1st Embodiment of this invention. (A)-(E) are all fragmentary sectional views which show the manufacture procedure of the flat plate type heat exchanger which concerns on 1st Embodiment of this invention. (A) is a perspective view which shows the basic composition of the flat plate type heat exchanger which concerns on 2nd Embodiment of this invention, (B) is the X1-X1 line | wire partial sectional view of FIG. 6 (A). (A) is a perspective view which shows the basic composition of the flat plate type heat exchanger which concerns on 3rd Embodiment of this invention, (B) is the X2-X2 line | wire partial sectional view of FIG. 7 (A). (A) is a perspective view which shows the basic composition of the flat plate type heat exchanger which concerns on 4th Embodiment of this invention, (B) is the Y1-Y1 line | wire partial sectional view of FIG. 8 (A). (A) is a perspective view which shows the basic composition of the flat plate type heat exchanger which concerns on 5th Embodiment of this invention, (B) is the Y2-Y2 line | wire partial sectional view of FIG. 9 (A). (A) is a top view which shows the basic composition of the heat exchanger plate of the conventional flat plate type heat exchanger, (B) is the sectional view on the AA line of FIG. 10 (A), (C) is an assembly. It is a perspective view which shows a procedure. (A) is a vertical sectional view showing a basic configuration of a conventional flat plate heat exchanger, and (B) is a partially enlarged view thereof. (A)-(C) are all fragmentary sectional views which show the manufacturing method of the heat exchanger plate of the conventional flat plate type heat exchanger. (A) is a side view schematically showing a basic configuration of a conventional EGR cooler, and (B) is a perspective view showing a basic configuration of fins.

(First embodiment)
A flat plate heat exchanger 10 according to the first embodiment of the present invention and a method of manufacturing the flat plate heat exchanger 10 will be described with reference to FIGS.
As shown in the perspective view of FIG. 1 (A), the flat plate heat exchanger 10 has a pair of flat plates 12A and 12B made of, for example, stainless steel, and the flat plates 12A and 12B close their peripheral ends, Oppositely arranged with an interval (distance H). A closed space C through which the fluid 18 passes is formed inside the flat plates 12A and 12B.

In the space C, a plurality of flow path walls 14 that connect the opposing surfaces of the flat plates 12A and 12B are formed. The flow path wall 14 partitions the space C and forms a plurality of flow paths 16. In the flow path 16, for example, a liquid fluid 18 is flowed in the direction of the arrow Q as a heat exchange medium.
An inlet 34 for the fluid 18 is provided at one end in the longitudinal direction (X direction) of the flat plate 12 </ b> A or 12 </ b> B, and the inlet 34 is in communication with the branch 20 provided inside the space C. One end portion of the flow path wall 14 is disposed in the branch portion 20, and the branch portion 20 and all the flow paths 16 partitioned by the flow path wall 14 are connected.
As a result, the fluid 18 injected from the inflow port 34 flows into the branch portion 20, and then is branched from the branch portion 20 to each flow channel 16, and is moved in the direction indicated by the arrow Q.

  An outlet 38 for the fluid 18 is provided at the other end in the longitudinal direction of the flat plates 12A and 12B. The outflow port 38 communicates with the collecting portion 36 formed in the space C. The other end of the flow path wall 14 is disposed in the collective part 36, and the collective part 36 is connected to all the flow paths 16 partitioned by the flow path wall 14. As a result, the fluid 18 that has been moved along the flow path 16 in the direction indicated by the arrow Q is collected in the collecting portion 36 and discharged from the outlet 38. In addition, although the outflow port 38 is provided in the flat plate 12A, you may provide it in the flat plate 12B.

Although the manufacturing method of the flow path wall 14 will be described later, a plurality of flow path walls 14 are formed linearly along the longitudinal direction of the flat plates 12A and 12B as shown in FIG. They are arranged at a predetermined distance d in the short direction (Y-axis direction). As shown in FIG. 1B, the flow path wall 14 is integrated with the flat plates 12A and 12B.
As a result, the fluid 18 can flow in the direction of the arrow Q from the branching portion 20 toward the collecting portion 36. Here, the predetermined distance d is a value determined by the heat exchange performance, and is not limited to the uniform interval, but may be an interval that varies depending on the location.

In addition, as shown in the front view of FIG. 2, the end in the longitudinal direction of the flow path wall 14 may be bent around the branch portion 20 and the collecting portion 36. Specifically, at the branching portion 20 that branches the fluid 18 that flows in from the inlet 34, the end of the flow path wall 14 that is far from the inlet 34 is bent in the direction of the inlet 34. The flow path 16 is narrowed. Similarly, in the gathering part 36 that collects and flows out the fluid 18 from the outlet 38, the end of the flow channel 16 far from the outlet 38 is bent in the direction of the outlet 38, so To narrow.
Thereby, the pressure loss in each flow path 16 can be equalized, and the fluid 18 can flow equally to each flow path 16.

  The flat plate heat exchanger 10, for example, allows a first fluid (for example, liquid) 18 to flow inside the flat plate heat exchanger 10, and a second heat exchange medium around the flat plate heat exchanger 10, such as air. By flowing the fluid (for example, gas) 19, heat can be exchanged between the fluid 18 and the fluid 19.

  Further, as shown in the perspective view of FIG. 3, a plurality of flat plate heat exchangers 10 (three in the figure) can be stacked in the depth direction (Z direction) to be used as a laminated heat exchanger 11. At this time, the first fluid 18 that has flowed through one flat plate heat exchanger 10 is caused to flow to the next flat plate heat exchanger 10 and further to the next flat plate heat exchanger 10. Further, the second fluid 19 is allowed to flow around the plurality of flat plate heat exchangers 10. With this configuration, the amount of exchange heat can be increased.

Next, the manufacturing method of the flat plate heat exchanger 10 will be described.
The flat plate heat exchanger 10 is characterized by a method of manufacturing the flow path wall 14. The manufacturing method of the flow path wall 14 will be mainly described with reference to FIGS.
Prior to the manufacture of the flow path wall 14, first, the pair of flat plates 12 </ b> A and 12 </ b> B are opposed to each other with a predetermined distance H therebetween. At this time, as for a pair of flat plate 12A, 12B, the surrounding edge part is closed and the closed space is formed in the center part. In addition, an opening is provided at one end of the flat plate 12 </ b> A, and an inflow port 34 serving as an inlet for the fluid into which the fluid 18 is introduced is attached. Further, an opening is provided at the other end of the flat plate 12A, and an outlet 38 for discharging the fluid 18 is attached (see FIG. 1A). In addition, the position of the inflow port 34 and the outflow port 38 is an illustration, What is necessary is just to determine according to the utilization form of the flat plate type heat exchanger 10. FIG.

  Next, for example, stainless steel metal powder (metal powder) 32 is filled in the space C formed between the flat plates 12A and 12B. As an example, the metal powder 32 has a particle size of 70 to 250 mesh (about 50 to 200 μm). A necessary amount of the metal powder 32 is injected using, for example, the inlet 34 or the outlet 38. The filling amount of the metal powder 32 is such that the space between the flat plates 12A and 12B is filled with the metal powder 32 without a gap at least in a portion irradiated with a high energy beam 22 described later.

  Subsequently, the flow path wall 14 is manufactured. As shown in FIG. 4A, the manufacturing apparatus 48 that manufactures the flow path wall 14 uses the emission unit 24 that emits the high energy beam 22 and the high energy beam 22 emitted from the emission unit 24 as an object. An irradiating unit 26 that irradiates the light, a driving unit 28 that moves the flat plates 12A and 12B in a direction indicated by an arrow M1, and a control unit 30 that controls them are provided. The manufacturing apparatus 48 may be a commercially available apparatus. The drive unit 28 may be configured to move the irradiation unit 26 in the direction of the arrow M2, or may be configured to move the flat plates 12A and 12B in the direction of the arrow M1 and move the irradiation unit 26 in the direction of the arrow M2. good.

  As an example, the high energy beam 22 emitted from the emission unit 24 is a laser beam. In this case, the emission unit 24 is a laser oscillator. In the emission part 24, the energy of the emitted high energy beam 22 can be adjusted. The irradiation unit 26 is configured by an optical system including a lens and the like. In the irradiation unit 26, the focal length of the irradiated high energy beam 22 can be adjusted by moving a lens or the like.

  By irradiating the position where the flow path wall 14 is to be formed with the high energy beam 22 from the beam irradiation apparatus, the metal powder 32 is melted and solidified to form the flow path wall 14. At this time, the flat plates 12A and 12B and the flow path wall 14 are integrated by melting their joints.

  Here, the state in which the metal powder 32 is melted and solidified by the high energy beam 22 will be described more specifically with reference to FIGS. 5 (A) to 5 (E). As shown in FIG. 5A, the focal length of the high energy beam 22 is adjusted by controlling the irradiation unit 26 by the control unit 30 and moving the lens or the like in the irradiation unit 26. The focal point 22A of the high energy beam 22 is set closer to the metal powder 32 than the inner surface 12S of the flat plate 12A. In this state, the high energy beam 22 is irradiated toward the metal powder 32 from the outside of the flat plate 12A.

  When the high energy beam 22 is irradiated in this way, a molten pool 44 as a melt is formed on a part of the flat plates 12A and 12B and a part of the metal powder 32. When the power density of the high energy beam 22 is high, metal evaporation occurs on the surface of the molten pool 44, and metal vapor 42 is generated. Further, a repulsive force is generated on the surface of the molten pool 44 by the steam 42, and a dent is generated in the central portion of the molten pool 44. When this recess becomes deep, a keyhole 46 is formed in the molten pool 44. When the keyhole 46 is thus formed in the molten pool 44, the high energy beam 22 reaches the deep position of the metal powder 32 through the keyhole 46.

  5B, the high energy beam 22 is moved relative to the flat plates 12A and 12B and the metal powder 32 while forming the keyhole 46 in the molten pool 44. The relative movement direction of the high energy beam 22 is parallel to the plane of the flat plates 12A and 12B. The relative movement of the high energy beam 22 with respect to the flat plates 12 </ b> A and 12 </ b> B and the metal powder 32 is realized by operating the drive unit 28 by the control unit 30 and moving the irradiation unit 26 by the drive unit 28.

  When the high energy beam 22 is relatively moved, a molten pool 44 is generated along the relative movement direction of the high energy beam 22 as shown in FIG. At this time, the molten pool 44 is formed at the irradiation position P of the relatively moving high energy beam 22, but the high energy beam 22 is relatively moved before the molten pool 44 expands, and therefore the relative movement direction of the high energy beam 22. At the rear side R of the irradiation position P at, the molten pool 44 is cooled and solidified.

  As described above, in this embodiment, the molten pool 44 is formed at the irradiation position P of the relatively moving high energy beam 22, but at the rear side R of the irradiation position P in the relative movement direction of the high energy beam 22, the molten pool 44 is melted. The relative moving speed of the high energy beam 22 is set so that the pond 44 is cooled and solidified.

  And as shown in FIG.5 (C), the flow path wall 14 is formed between the flat plates 12A and 12B when the molten pool 44 is cooled and solidified. Since the flow path wall 14 is formed by solidifying a molten pool 44 formed by melting a part of the flat plates 12A and 12B and a part of the metal powder 32, the flat plate 12A, 12B is integrally formed. Further, as described above, the high energy beam 22 is relatively moved in parallel with the surface of the flat plate 12A, so that the flow path wall 14 is formed by sequentially blocking the distance H between the flat plates 12A and 12B. The

  In the present embodiment, as shown in FIG. 5C, only a part of the metal powder 32 filled between the flat plates 12A and 12B is melted, and the unmelted part remains. . When the molten pool 44 is cooled and solidified, the remaining metal powder 32 plays a role of mold (maintaining the shape of the molten pool 44 and releasing heat). For this reason, in this embodiment, the molten pool 44 is solidified and the flow path wall 14 is formed in a state where the molten pool 44 is maintained in a shape (a shape in which the optical axis direction of the high energy beam 22 is the depth direction). Is done.

  Then, as shown in FIG. 4A, the drive unit 28 is operated by the control unit 30, and the irradiation unit 26 is moved in the direction of the arrow M2. Thereafter, by repeating the above-described operation, a plurality of flow path walls 14 are formed between the flat plates 12A and 12B that are spaced apart by a predetermined distance H, respectively.

  Thereafter, as shown in FIG. 4B, the metal powder 32 remaining inside the flat plates 12A and 12B is discharged to the outside from between the flat plates 12A and 12B. The metal powder 32 has fluidity and can be easily discharged from the inflow port 34 or the outflow port 38 by being inclined. If necessary, compressed air may be blown, or a new opening may be provided on the flat plates 12A and 12B for discharge.

  By executing the above steps, the inner wall of one flat plate 12A and the inner wall of the other flat plate 12B are connected by the flow path wall 14, and the flow path 16 of the fluid 18 is formed.

  FIG. 5D shows a side cross-sectional view of the flow path wall 14 manufactured in the above manner and its peripheral portion. FIG. 5E shows the flow path wall 14 and its peripheral portion. The front sectional view of is shown. In addition, the thickness and depth of the flow path wall 14 are adjusted by changing the relative moving speed of the high energy beam 22.

  The irradiation position of the high energy beam 22 may be irradiated from the flat plate 12A side to the flat plate 12B, or may be irradiated from the flat plate 12B side to the flat plate 12A, for example. Further, the irradiation direction of the high energy beam 22 may be irradiated not only from a direction orthogonal to the surfaces of the flat plates 12A and 12B but also from a direction inclined with respect to the surfaces. Thereby, a channel wall can be inclined with respect to the wall surface of flat plate 12A, 12B.

Next, functions and effects will be described in comparison with a conventional flat plate heat exchanger.
10 and 11 show a flat plate heat exchanger 60. The flat plate heat exchanger 60 is an example of a conventional flat plate heat exchanger, and a plurality of heat transfer plates 62 each having a concavo-convex surface 64 are overlapped at the position of the concavo-convex surface 64 to heat the heat transfer plate 62 and heat transfer. In this configuration, a fluid is passed between the plates 62 to exchange heat.

Specifically, as shown in the plan view of the heat transfer plate 62 in FIG. 10A and the cross-sectional view of the heat transfer plate 62 in FIG. 10B, the corners of the heat transfer plate 62 are round in plan view. The flat plate portion at the center is formed as an uneven surface 64. A side edge 67 is raised from the periphery of the concavo-convex surface 64, and an outer edge 66 is formed on the side edge 67.
Here, the uneven surface 64 is formed with V-shaped unevenness that is continuous in one direction by press working. Further, two apertures 69 and 70 are formed at radial positions separated by 90 degrees from the center of the heat transfer plate 62. A projecting edge 72 rises from the flat plate portion around the opening 70, and the outer diameter of the projecting edge 72 is such that it can be inserted into the opening 69 without a gap.

As shown in FIG. 10C, the heat transfer plate 62 is rotated by 90 degrees and a plurality of sheets are stacked (four in the figure). At this time, the uneven surface 64 is overlapped in a direction in which the V-shaped unevenness is orthogonal, and the opening 69 is overlapped with the opening 70 of the heat transfer plate 62 to be stacked, and the protrusion of the heat transfer plate 62 to be stacked. The edge 72 is inserted into the opening 69 without a gap.
Thereby, the flow path which flows the fluid made to heat-exchange is formed by the uneven surface 64 piled up in the orthogonal direction. Further, every other heat transfer plate 62 is connected to the flow path by the protrusion 72. As a result, two types of fluids (first fluid and second fluid) can flow alternately (every other heat transfer plate 62).

FIG. 11A shows a flat plate heat exchanger 60 in which 13 heat transfer plates 62 are stacked. The flat plate heat exchanger 60 is provided with a first inlet 73 through which the first fluid flows, a first outlet 109 through which the first fluid flows out, a second inlet 108 through which the second fluid flows in, and a second outlet 75 through which the second fluid flows out. .
Here, as shown in FIG. 11B, the flat plate heat exchanger 60 is formed with the outer edge portion 66 and the side edge portion 67 of the heat transfer plate 62 in a state where the required number of heat transfer plates 62 are stacked. A ring-shaped brazing material 78 is placed in the groove, and further, a sheet-shaped brazing material 79 is placed between the concave and convex surfaces 64 of the laminated heat transfer plates 62 and heated in an electric furnace to overlap the surface. Are integrated by brazing.
Thereby, a flow path is formed in the uneven surface 64 stacked vertically, and heat exchange can be performed between the first fluid and the second fluid.

Here, the conventional heat transfer plate 62 has been manufactured by press working in order to form V-shaped irregularities. Specifically, as shown in FIG. 12, a flat heat transfer plate press plate material 86 is formed by a press die 84 (an upper die 84A and a lower die 84B) in which the shape of the concavo-convex surface 64 is engraved. I was press working.
That is, first, the heat transfer plate press plate material 86 is set in the press die 84, and the upper die 84A is moved in the direction of the arrow DN to start the press work (see FIG. 12A).
Next, when the upper mold 84A is moved to a predetermined position and overlapped with the lower mold 84B, the uneven surface 64 is press-molded on the heat transfer plate press plate material 86 (see FIG. 12B).
Finally, the upper mold 84A is moved in the direction of the arrow UP, and the heat transfer plate press plate 86 on which the uneven surface 64 is formed is taken out. Thereby, the heat exchanger plate 62 provided with the uneven surface 64 is formed (refer FIG.12 (C)).

  However, this method requires a large pressing mold to form the large heat transfer plate 62. There is a physical and economic limit to increasing the size of the press die 84. Moreover, the change of the metal mold | die 84 for a press was also needed for the change of the shape of the uneven surface 64. FIG. Furthermore, the work of laminating a plurality of heat transfer plates 62 and brazing in an electric furnace is required, and workability is limited.

In contrast, in the present embodiment, as described in FIGS. 4 and 5, the flow path wall 14 is formed by the high energy beam 22 from the outside of the flat plates 12 </ b> A and 12 </ b> B. Does not require pressing. As a result, even when the flow path wall 14 is formed on the large flat plates 12A and 12B, in the control of the high energy beam 22, for example, by expanding the moving range of the irradiation unit 26, the flow path wall 14 can be formed flexibly. It becomes possible to cope with. In addition, it is possible to flexibly cope with the manufacture of a flow path having a complicated shape and the change of the flow path shape by controlling the high energy beam 22.
Furthermore, in this embodiment, since the flow path 16 is completed by forming the flow path wall 14, a brazing operation for forming the flow path 16 is not required, and a reduction in manufacturing cost can be expected.

Another example of a conventional flat plate heat exchanger is an EGR cooler (exhaust gas recirculation device) 50. The present embodiment will be described in comparison with a method for manufacturing the EGR cooler 50.
As shown in the sectional view of FIG. 13A and the perspective view of the fin portion of FIG. 13B, the EGR cooler 50 is used for exhaust gas cooling, and the inside of the outer cylinder 51 is a heat exchanging portion 53. The heat exchanging portion 53 has a cooling water passage 55 that is closed at both ends by a partition plate 56 and through which the cooling water 58 flows. The cooling water passage 55 includes a cooling water passage 55 in a direction intersecting the direction of the cooling water 58. A vent pipe 52 penetrating through is provided.
A small fin 54 is formed inside the vent pipe 52. Thus, if the exhaust gas 57 passes through the vent pipe 52 provided with the fins 54, the exhaust gas 57 is cooled by the cooling water 58 when passing through the vent pipe 52.

  The EGR cooler 50 is required to be reduced in size, to suppress internal pressure loss, and to ensure heat exchange capability. For this reason, for example, the fin 54 as the heat exchange unit employs a complicated flow path processed into a narrow width W. The fins 54 are fixed to the vent pipe 52 by brazing. In press working, there is a limit to miniaturization, and further miniaturization of the fins 54 is difficult. In addition, labor is required for the brazing operation inside the ventilation pipe 52.

  In the present embodiment, the miniaturization and complexity of the fins 54 can be dealt with by controlling the high energy beam 22. That is, it does not require a pressing die and can flexibly cope with the production of a small heat exchanging portion. Furthermore, since the ventilation pipe 52 and the fin 54 can be formed integrally, a brazing operation is not required, and a reduction in manufacturing cost can be expected.

As described above, according to the present embodiment, the flow path wall 14 irradiates the metal powder 32 enclosed in the space formed by the pair of flat plates 12 </ b> A and 12 </ b> B from the manufacturing apparatus 48 with the high energy beam 22. Therefore, no pressing process is required. That is, by controlling the high energy beam 22, it is possible to cope with an increase in size and size of the flat plate heat exchanger 10.
Further, since the flat plate 12A and the flat plate 12B and the flow path wall 14 are integrally formed, a brazing operation is not required, and the manufacturing cost can be reduced.

  Further, since the flow path wall 14 is formed by melting and solidifying the metal powder 32, only the portion where the particles of the metal powder 32 are in contact with the molten pool 44 is melted incompletely on the surface. It remains as it is without being finished in a solidified state, and is a so-called rough surface. For this reason, the flow of the fluid 18 flowing near the surface can be disturbed, and the heat exchange efficiency can be increased. Further, since the flow path wall 14 can be easily formed along the locus of the high energy beam 22, the flow path 16 can be appropriately formed with a high degree of freedom.

  Further, in the method for manufacturing the flat plate heat exchanger 10 of the present embodiment, the high energy beam 22 is moved relative to the pair of flat plates 12A and 12B and the metal powder 32 in the welding process. The flow path wall 14 is formed along the relative movement direction. According to the manufacturing method of the flat plate heat exchanger 10, the high energy beam 22 is relatively moved with respect to the flat plates 12 </ b> A and 12 </ b> B and the metal powder 32, and the flow path is along the relative moving direction of the high energy beam 22. Since the wall 14 is formed, the continuous flow path wall 14 can be formed in the relative movement direction of the high energy beam 22.

  Moreover, the manufacturing method of the flat plate type heat exchanger 10 of this embodiment is a part of flat plate 12A, a part of flat plate 12B, and a part of metal powder 32 by irradiating the high energy beam 22 in a welding process. The molten pool 44 is formed as a molten material, and the high energy beam 22 is relatively moved while forming the keyhole 46 in the molten pool 44. According to the manufacturing method of this flat plate heat exchanger 10, while forming the keyhole 46 in the molten pool 44 formed in a part of the flat plate 12A, a part of the flat plate 12B, and a part of the metal powder 32, The high energy beam 22 is relatively moved. Therefore, since the high energy beam 22 can reach a deep position through the keyhole 46, the flow path wall 14 can be formed between the flat plate 12A and the flat plate 12B.

Next, a development example will be described.
In the present embodiment, in the continuous formation of the flow path wall 14, as an example, a method of moving the irradiation unit 26 of the manufacturing apparatus 48 while fixing the positions of the pair of flat plates 12 </ b> A and 12 </ b> B has been described. However, the present invention is not limited to this. For example, when the pair of flat plates 12A and 12B is small, the irradiation unit 26 may be fixed and the pair of flat plates 12A and 12B may be moved. Moreover, you may move both the irradiation part 26 and a pair of flat plate 12A, 12B simultaneously.

  As another development example, the emitting unit 24 is configured by a laser oscillator, and the high energy beam 22 is a laser beam as an example. However, the emitting unit 24 may be configured to emit a high energy beam other than a laser, such as an electron beam or a plasma beam. And the flow path wall 14 may be formed using high energy beams other than this laser.

  Moreover, in the said embodiment, when irradiating from the outer side of a pair of flat plate 12A, 12B, the focus 22A of the high energy beam 22 is set to the metal powder 32 side rather than the surface which a pair of flat plate 12A, 12B opposes. It was. However, the present invention is not limited to this. For example, if a part of the pair of flat plates 12A and 12B and a part of the metal powder 32 can be melted, the focal point 22A of the high energy beam 22 is You may set in any position from the outer surface of a pair of flat plate 12A, 12B to the inside of the metal powder 32. FIG.

  According to the manufacturing method of the flat plate heat exchanger 10, the focal point 22A of the high energy beam 22 is set at any position from the outer surface of the pair of flat plates 12A and 12B to the inside of the metal powder 32. A part of the flat plates 12A and 12B and a part of the metal powder 32 can be effectively melted to produce a melt.

  Further, when the focal point 22A of the high-energy beam 22 is set at any position from the outer surface of the pair of flat plates 12A and 12B to the inside of the metal powder 32, one of the pair of flat plates 12A and 12B. The molten pool 44 may be formed in a part of the metal powder 32, and the keyhole 46 may be formed in the molten pool 44.

Further, in the present embodiment, the material of the pair of flat plates 12A and 12B and the metal powder 32 are described by taking stainless steel as an example. However, it is not limited to this, For example, other metals, such as titanium and a titanium alloy, may be sufficient.
In the present embodiment, the first fluid 18 that flows inside the flat plate heat exchanger 10 is described as an example, and the second fluid 19 that flows outside the flat plate type heat exchanger 10 is described as an example. However, the present invention is not limited to this, and a gas may be employed as the first fluid 18 and a liquid may be employed as the second fluid 19. In addition, both the first fluid 18 and the second fluid 19 may employ a liquid, and both the first fluid 18 and the second fluid 19 may employ a gas.

(Second Embodiment)
A flat plate heat exchanger 80 according to a second embodiment of the present invention will be described with reference to FIG.
As shown in the perspective view of FIG. 6 (A) and the partial cross-sectional view of FIG. 6 (B), the flat plate heat exchanger 80 has an outer peripheral wall extending between the pair of flat plates 12A and 12B over the entire periphery. 82 is different from the flat plate heat exchanger 10 according to the first embodiment in that it is joined to 82. The difference will be mainly described.

The outer peripheral wall 82 is formed by melting and solidifying the metal powder 32 with the high energy beam 22 described in the first embodiment. At this time, in order to fill the metal powder 32 at the position of the outer peripheral wall 82, the entire periphery of the flat plates 12A and 12B is previously surrounded by a mold to prevent the metal powder 32 from spilling outside the flat plates 12A and 12B. The metal powder 32 may be filled in the formation portion of the outer peripheral wall 82. The mold is removed after the metal powder 32 is melted and solidified by the high energy beam 22.
Accordingly, the flat plate heat exchanger 80 can be formed without pressing the entire periphery of the flat plates 12A and 12B. Other configurations and the manufacturing method of the flow path wall 14 are the same as those in the first embodiment, and the description thereof is omitted.

(Third embodiment)
A flat plate heat exchanger 74 according to a third embodiment of the present invention will be described with reference to FIG.
The flat plate heat exchanger 74 is different from the flat plate heat exchanger 10 in the first embodiment in that the flow path wall 76 extends in the longitudinal direction (X direction) of the flat plates 12A and 12B and is bent in a zigzag shape. Is different. The difference will be mainly described.

  As shown in the perspective view of FIG. 7A and the partial cross-sectional view of FIG. 7B, the flat plate heat exchanger 74 has a plurality of flow path walls 76, and all of the flow path walls 76 are flat plates 12A. , 12B extending in the longitudinal direction and bent in a zigzag shape. Here, the flow path wall 76 is formed by melting and solidifying the metal powder 32 with the high energy beam 22 as described in the first embodiment.

  According to the present embodiment, the fluid 18 can flow in the direction of the arrow Q while changing the direction in a zigzag manner along the flow path wall 76. Thereby, the flow of the fluid 18 can be disturbed and the heat exchange efficiency can be increased. The zigzag bent shape may be a combination of only straight lines or a combination of straight lines and curves. By combining a straight line and a curved line, the fluid 18 can flow smoothly.

  Moreover, the press wall and brazing work are not required for forming the flow path wall 76, and the flow path wall 76 can be formed between the pair of flat plates 12A and 12B by the control of the high energy beam 22. As a result, the processing of the flow path wall 76 is facilitated, and the flat plate heat exchanger 74 can be formed at a low cost. Other configurations and the manufacturing method of the flow path wall 76 are the same as those in the first embodiment, and a description thereof will be omitted.

(Fourth embodiment)
A flat plate heat exchanger 90 according to a fourth embodiment of the present invention will be described with reference to FIG.
The flat plate heat exchanger 90 has a configuration in which two heat exchange portions 98 and 99 are formed using three flat plates 12A, 12B, and 12C. The difference from the flat plate heat exchanger 10 described in the first embodiment will be mainly described.

  As shown in the perspective view of FIG. 8A and the cross-sectional view of FIG. 8B, the flat plate heat exchanger 90 is a first heat exchange section in which a flow path 16 is formed between a pair of flat plates 12A and 12B. 98. This is the same configuration as the flat plate heat exchanger 10 described in the first embodiment. Further, the flat plate heat exchanger 90 has a second heat exchange part 99 in which the flat plate 12B is shared and the flow path 16 is formed between the pair of flat plates 12B and 12C. This is also the same configuration as the flat plate heat exchanger 10 described in the first embodiment.

  The flat plate 12A of the first heat exchange section 98 is provided with an inlet 34 for the first fluid 95 and an outlet 38, and the first fluid 95 that has flowed in from the inlet 34 is between the flat plates 12A and 12B. It flows out from the outlet 38 through the flow path 16. On the other hand, the flat plate 12C of the second heat exchange unit 99 is provided with an inlet 92 for the second fluid 96 and an outlet 93, and the second fluid 96 flowing in from the inlet 92 is supplied to the flat plates 12B and 12C. It flows out from the outlet 93 through the flow path 16 between them. Thereby, heat exchange can be performed between the first heat exchange unit 98 and the second heat exchange unit 99.

Here, the shape of the flow path wall 14 may be linear as described in the first embodiment and the second embodiment, and as described in the third embodiment, it extends in the longitudinal direction and is bent in a zigzag shape. May be. Moreover, both the 1st fluid 95 and the 2nd fluid 96 may be a liquid, both may be gas, and either one may be liquid and the other may be gas.
Other configurations and the manufacturing method of the flow path wall 14 are the same as those in the first embodiment, and the description thereof is omitted.

(Fifth embodiment)
A flat plate heat exchanger 100 according to a fifth embodiment of the present invention will be described with reference to FIG.
The flat plate heat exchanger 100 has a configuration in which the flat plate heat exchanger 90 described in the fourth embodiment is stacked in two stages in the thickness direction (Z direction). The difference from the flat plate heat exchanger 90 will be mainly described.

As shown in the perspective view of FIG. 9A and the cross-sectional view of FIG. 9B, the flat plate heat exchanger 100 includes a first heat exchanger 110 and a second heat exchanger 112 stacked in the thickness direction. This is the configuration.
Here, the basic internal structure of the first heat exchanger 110 and the second heat exchanger 112 such as the flow path wall 14 is the same as that of the flat plate heat exchanger 90 described in the fourth embodiment. Is omitted.

An inlet 102 and an outlet 103 for the first fluid 95 are provided on the flat plate 12A of the first heat exchanger 110. The inflow port 102 is connected to the branch portion 20 of the first heat exchanger 110 and the second heat exchanger 112, and the outflow port 103 is connected to the collective portion 36 of the first heat exchanger 110 and the second heat exchanger 112. It is connected with.
Further, the flat plate 12 </ b> A of the first heat exchanger 110 is provided with an inlet 104 and an outlet 105 for the second fluid 96. The inflow port 104 is connected to the branch portion 20 of the first heat exchanger 110 and the second heat exchanger 112, and the outflow port 105 is connected to the assembly portion 36 of the first heat exchanger 110 and the second heat exchanger 112. It is connected with.

As a result, the first fluid 95 introduced from the inlet 102 passes through the flow path 16 of the first heat exchanger 110 and flows out of the outlet 103 and passes through the flow path 16 of the second heat exchanger 112. A flow that flows out from the outlet 103 is formed. On the other hand, the second fluid 96 flowing in from the inlet 104 flows through the flow path 16 of the first heat exchanger 110 and flows out of the outlet 103 and flows through the flow path 16 of the second heat exchanger 112. A flow flowing out from the outlet 105 is formed.
Thereby, heat exchange can be performed between the first fluid 95 and the second fluid 96 in the first heat exchanger 110 and the second heat exchanger 112, respectively.

  Moreover, in this embodiment, the case where each flow path wall 14 of the 1st heat exchanger 110 and the 2nd heat exchanger 112 was linear was demonstrated. However, the present invention is not limited to this, and part or all of the flow path wall 14 may extend in the longitudinal direction and be bent in a zigzag shape.

Moreover, both a 1st fluid and a 2nd fluid may be a liquid, and both may be gas. Furthermore, either one may be liquid and the other gas.
Other configurations and the manufacturing method of the flow path wall 14 are the same as those in the first embodiment, and the description thereof is omitted.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that the present invention can be variously modified and implemented without departing from the spirit of the present invention. is there.

DESCRIPTION OF SYMBOLS 10 ... Flat plate type heat exchanger, 12A ... Flat plate (1st flat plate), 12B ... Flat plate (2nd flat plate), 14 ... Channel wall (melt), 16 ... Channel, 18 ... 1st fluid (fluid) , 19 ... second fluid (fluid), 20 ... branching part (introduction flow path), 22 ... high energy beam, 24 ... emitting part, 26 ... irradiation part, 28 ... drive part, 30 ... control part, 32 ... metal Powder, 34 ... Inlet, 36 ... Collecting part (discharge channel), 38 ... Outlet, 44 ... Molten pool, 46 ... Keyhole, 74 ... Flat plate heat exchanger, 76 ... Channel wall, 77 ... Current Road, C ... space, P ... irradiation position, R ... rear side of irradiation position, H ... distance, M1 ... moving direction, M2 ... moving direction, Q ... flow direction

Claims (4)

A powder filling step of filling metal powder between the first and second flat plates made of metal facing each other;
In a state where the metal powder is in contact with the first flat plate and the second flat plate, from the outside of the first flat plate or the second flat plate toward the first flat plate, the second flat plate, and the metal powder. By irradiating with a high energy beam, a part of the first flat plate, a part of the second flat plate, and a part of the metal powder are melted to form a melt, and the melt is solidified. A welding step of forming a flow path wall between the first flat plate and the second flat plate to obtain a flow path and a heat transfer section of the flat plate heat exchanger;
The manufacturing method of the flat plate type heat exchanger provided with.   In the welding step, the high energy beam is relatively moved with respect to the first flat plate, the second flat plate, and the metal powder, and the flow path wall is formed along the relative movement direction of the high energy beam. The manufacturing method of the flat plate type heat exchanger of Claim 1.   In the welding step, by irradiating the high energy beam, a molten pool as the melt is formed on a part of the first flat plate, a part of the second flat plate, and a part of the metal powder. The method for producing a flat plate heat exchanger according to claim 2, wherein the high energy beam is relatively moved while forming a keyhole in the molten pool.   In the welding step, the focal point of the high energy beam is set at any position from the outer surface of the first flat plate or the second flat plate to the inside of the metal powder. The flat plate type heat according to any one of claims 1 to 3, wherein the high energy beam is irradiated from the outside of the second flat plate toward the first flat plate, the second flat plate, and the metal powder. Exchanger manufacturing method.

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