Heat exchange core, heat exchanger and method for manufacturing a heat exchange core

Abstract

The heat exchange core has a plurality of internal flow paths and a header flow path communicating with the plurality of internal flow paths, an inner wall of the header flow path has a surface roughness greater than flow path walls of the plurality of internal flow paths.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a heat exchange core, a heat exchanger, and a manufacturing method of a heat exchange core.

[0002] This application claims priority based on Japanese Patent Application No. 2020-031513 and No. 2020-031525 filed on February 27, 2020, with the contents thereof incorporated herein by reference. BACKGROUND

[0003] A heat exchanger disclosed in Patent Literature 1 includes a plurality of plates arranged in parallel to each other, and a plurality of spacers arranged in parallel to each other so as to extend between the plates in a manner of demarcating a primary passage and a secondary passage. It is also disclosed that the heat exchanger includes a primary passage in which the primary passage is thick.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. 2018-511773 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, in the conventional structure shown in Patent Literature 1, the plates are brazed to each other by a known method, and it is not possible to shorten the manufacturing time (molding time) of the heat exchanger (heat exchange core).

[0009] At least one embodiment of the present disclosure is achieved in view of the above circumstances, and an object thereof is to provide a heat exchange core, a heat exchanger, and a manufacturing method of a heat exchange core, which can reduce manufacturing costs by shortening the molding time.

[0010] SOLUTION TO THE PROBLEM

[0011] To achieve the above object, the heat exchange core of the present application has:

[0012] a plurality of internal flow paths; and

[0013] a header flow path which communicates with the plurality of internal flow paths,

[0014] an inner wall of the header flow path has a surface roughness greater than a flow path wall of the internal flow path.

[0015] Further, the manufacturing method of the heat exchange core of the present disclosure is a manufacturing method of a heat exchange core provided with a plurality of internal flow paths extending in parallel to each other and a header flow path communicating with the plurality of internal flow paths, wherein the manufacturing method of the heat exchange core includes a step of forming the internal flow paths by performing layer molding along the extension direction of the internal flow paths, and a step of forming the header flow path by performing layer molding along the extension direction, the inner wall of the header flow path having a larger surface roughness than the flow path wall of the internal flow paths.

[0016] Effects of Invention

[0017] According to the heat exchange core of the present disclosure, in the case where the heat exchange core is molded by layer molding, the molding time per unit volume of the portion provided with the header flow path can be made shorter than the portion provided with the internal flow path. Therefore, the molding time of the entire heat exchange core can be shortened, and thus the manufacturing cost of the heat exchange core can be reduced.

[0018] Further, according to the manufacturing method of the heat exchange core of the present disclosure, the inner wall of the header flow path has a larger surface roughness than the flow path wall of the internal flow paths, and thus the molding time per unit volume in the step of forming the header flow path can be made shorter than the portion provided with the internal flow path. Therefore, the molding time of the entire heat exchange core can be shortened, and thus the manufacturing cost of the heat exchange core can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view schematically showing the structure of a heat exchange core of one embodiment.

[0020] Figure 2 is Figure 1 is a II-II line cross-sectional view of the heat exchange core shown in FIG.

[0021] Figure 3 is Figure 1 is a III-III line cross-sectional view of the heat exchange core shown in FIG.

[0022] Figure 4 is Figure 2 is a IV-IV line cross-sectional view of the heat exchange core shown in FIG.

[0023] Figure 5 is Figure 2 is a V-V line cross-sectional view of the heat exchange core shown in FIG.

[0024] Figure 6 is a perspective view schematically showing the structure of a heat exchange core of one embodiment.

[0025] Figure 7 is a perspective view schematically showing an adapter that changes the cross-sectional shape of a flow path.

[0026] Figure 8 This is a diagram illustrating a heat exchanger according to one embodiment.

[0027] Figure 9 This is a diagram illustrating a method for manufacturing a heat exchange core according to one embodiment. Detailed Implementation

[0028] Hereinafter, the heat exchange core 1, heat exchanger 6, and manufacturing method of the heat exchange core 1 according to embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the constituent components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0029] [Simplified structure of heat exchange core 1]

[0030] The heat exchange core 1 of the embodiments of this disclosure is a component used alone or assembled in a heat exchanger 6, and heat exchange occurs between a first fluid and a second fluid supplied to the heat exchange core 1. The first fluid and the second fluid supplied to the heat exchange core 1 can be either liquids or gases, but they are usually at different temperatures.

[0031] like Figure 1 As shown, the heat exchange core 1 of the present disclosure includes a main body portion 11 and a manifold portion 12. For example, the heat exchange core 1 can be provided in a cuboid shape, but is not limited to this. For example, when the heat exchange core 1 is cuboid in shape, the main body portion 11 is provided in the main body portion of the cuboid, and a pair of manifold portions 12 are provided at one end (upper end) and the other end (lower end) of the cuboid. For example, the manifold portions 12 provided at one end and the other end of the cuboid are located at the four corners in the same plane of the cuboid.

[0032] For example, when the heat exchange core 1 is rectangular, the manifold 12 can be provided on the outside of the cuboid, but it is not limited to this. For example, if a pair of manifolds 12 are provided at one end and the other end of the cuboid, they are provided to extend outward in the width direction of the cuboid. Furthermore, the manifolds 121 and 122 provided at one end of the cuboid become the first manifold 121 and the second manifold 122, respectively, and the manifolds 123 and 124 provided at the other end become the third manifold 123 and the fourth manifold 124, respectively.

[0033] The header flow path 3 is provided in the header portion 12. As described above, for example, in the case where the heat exchange core 1 is in a cuboid shape, and a pair of header portions 12 is provided at one end portion and the other end portion of the cuboid so as to extend to the outside in the width direction of the cuboid, the header flow path 3 is provided in the pair of header portions 12 provided at the one end portion and the other end portion of the cuboid, respectively. Further, the header flow path 31 provided in the first header portion 121 becomes the first header flow path 31, and the header flow path 32 provided in the second header portion 122 becomes the second header flow path 32. In addition, the header flow path 33 provided in the third header portion 123 becomes the third header flow path 33, and the header flow path 34 provided in the fourth header portion 124 becomes the fourth header flow path 34.

[0034] Further, in the heat exchange core 1 in which the first fluid and the second fluid flow in directions opposite to each other (hereinafter referred to as "counterflow heat exchange core 1"), the first header flow path 31 becomes a flow path for supplying the first fluid to the main body portion 11, and the second header flow path 32 becomes a flow path for discharging the second fluid from the main body portion 11. In addition, the third header flow path 33 becomes a flow path for discharging the first fluid from the main body portion 11, and the fourth header flow path 34 becomes a flow path for supplying the second fluid to the main body portion 11. Note that, in the heat exchange core 1 in which the first fluid and the second fluid flow in the same direction (hereinafter referred to as "parallel flow heat exchange core 1"), the second header flow path 32 becomes a flow path for supplying the second fluid to the main body portion 11, and the fourth header flow path 34 becomes a flow path for discharging the second fluid from the main body portion 11.

[0035] As described above, the header flow path 3 is a plurality of flow paths, and although not illustrated in the drawings, the plurality of header flow paths 3 can have different flow path opening shapes from each other. For example, as described above, the header flow path 3 of the heat exchange core 1 is the first header flow path 31, the second header flow path 32, the third header flow path 33, and the fourth header flow path 34, and the flow path opening shapes of these four header flow paths 3, i.e., the first header flow path 31, the second header flow path 32, the third header flow path 33, and the fourth header flow path 34, can be different from each other.

[0036] In this way, if the header flow path 3 is a plurality of flow paths, and the opening shapes of the plurality of header flow paths 3 are different from each other, when the pipe is connected to the heat exchange core 1, connection errors can be more reliably prevented by the difference in the flow path opening shapes.

[0037] As Figure 2As shown, the heat exchange core 1 of the present disclosure has a plurality of internal flow paths 2 in the main body 11. The plurality of internal flow paths 2 extend parallel to each other, and at their ends along the extending direction, they communicate with the aforementioned manifold flow path 3. For example, when the heat exchange core 1 is cuboid in shape, the plurality of internal flow paths 2 are arranged along the length direction of the cuboid, and the aforementioned manifold flow path 3 is arranged along a direction orthogonal to the length direction of the cuboid. Furthermore, at one end and the other end of the plurality of internal flow paths 2, they communicate with the aforementioned manifold flow path 3.

[0038] like Figure 3 As shown, multiple internal flow paths 2 constitute multiple first flow paths 21 for the flow of a first fluid and multiple second flow paths 22 for the flow of a second fluid. Each of the multiple first flow paths 21 and each of the multiple second flow paths 22, in a section orthogonal to the length direction of the cuboid, extends in the depth direction (within...) Figure 3 The first flow paths 21 and second flow paths 22 are alternately arranged in the Y direction, and adjacent first flow paths 21 and second flow paths 22 are separated by partitions 23. It should be noted that the number of multiple first flow paths 21 and multiple second flow paths 22, i.e., the number of partitions 23, is not limited to a certain value. Figure 3 The quantity shown can be set to any quantity.

[0039] For example, multiple first flow paths 21 and multiple second flow paths 22 are respectively divided into multiple segmented flow paths 211 and 221, but are not limited to this. When multiple first flow paths 21 and multiple second flow paths 22 are respectively divided into multiple segmented flow paths 211 and 221, the multiple segmented flow paths 211 and 221 of each of the multiple first flow paths 21 and multiple second flow paths 22 extend along the width direction (in the cross-section orthogonal to the cuboid)... Figure 3 In the X direction, adjacent partitioned flow paths 211(221) are separated by partition walls 24. It should be noted that the number of partitioned flow paths 211 and 221 for each of the multiple first flow paths 21 and multiple second flow paths 22, i.e., the number of partition walls 24 respectively disposed on the multiple first flow paths 21 and multiple second flow paths 22, is not limited to a certain number. Figure 3 The quantity shown can be set to any quantity.

[0040] Figure 4 This is a diagram showing the intermediate flow path 41 that connects the first manifold flow path 31 and the first flow path 21, as described later. Figure 5 This is a diagram showing the intermediate flow path 42 that does not connect the first manifold flow path 31 and the second flow path 22, as described later.

[0041] like Figure 4 as well as Figure 5As shown, when multiple first flow paths 21 and multiple second flow paths 22 are respectively divided into multiple segmented flow paths 211 and 221, each of the multiple first flow paths 21 and multiple second flow paths 22 has an intermediate flow path 4 at one end and the other end.

[0042] like Figure 4 As shown, an intermediate flow path 41 (hereinafter referred to as "first intermediate flow path 41") disposed at one end (upper end) of the first flow path 21 communicates with one end (upper end) of the plurality of segmented flow paths 211 in the extending direction (extending direction of the first flow path 21) divided by the first flow path 21. Furthermore, the first intermediate flow path 41 opens at one end (upper end) of the first flow path 21, and is separated from the outside by an outer wall (upper wall) 116. Figure 5 As shown, the intermediate flow path 42 (hereinafter referred to as "second intermediate flow path 42") located at one end (upper end) of the second flow path 22 communicates with one end (upper end) of the plurality of segmented flow paths 221 in the extending direction (extending direction of the second flow path 22) divided by the second flow path 22. Furthermore, the second intermediate flow path 42 opens at one end (upper end) of the second flow path 22, and is separated from the outside by the outer wall (upper wall) 116. Although not shown, the intermediate flow path (hereinafter referred to as "third intermediate flow path") located at the other end (lower end) of the first flow path 21 communicates with the other end (lower end) of the plurality of segmented flow paths 211 in the extending direction (extending direction of the first flow path 21). Furthermore, the third intermediate flow path opens at the other end (lower end) of the first flow path 21, and is separated from the outside by the outer wall (bottom wall) 111. The intermediate flow path (hereinafter referred to as the "fourth intermediate flow path") located at the other end (lower end) of the second flow path 22 communicates with the other end (lower end) of the plurality of segmented flow paths 221 divided by the second flow path 22 in the extending direction (the extending direction of the second flow path 22). The fourth intermediate flow path opens at the other end (lower end) of the second flow path 22, and is separated from the outside by the outer wall (bottom wall) 111.

[0043] like Figure 4 As shown, the first manifold flow path 31 extends at one end (upper end) of the first flow path 21 in the extension direction of the first flow path 21 in a direction orthogonal to the extension direction of the first flow path 21, and is connected to the first flow path 21 via the first intermediate flow path 41. Figure 5As shown, the second manifold flow path 32 extends from one end (upper end) of the second flow path 22 in the extension direction of the second flow path 22 in a direction orthogonal to the extension direction of the second flow path 22, and communicates with the second flow path 22 via the second intermediate flow path 42. Although not shown, the third manifold flow path 33 extends from the other end (lower end) of the first flow path 21 in the extension direction of the first flow path 21 in a direction orthogonal to the extension direction of the first flow path 21, and communicates with the first flow path 21 via the third intermediate flow path. The fourth manifold flow path 34 extends from the other end (lower end) of the second flow path 22 in the extension direction of the second flow path 22 in a direction orthogonal to the extension direction of the second flow path 22, and communicates with the second flow path 22 via the fourth intermediate flow path.

[0044] like Figure 2 As shown, a partition 4a is provided between the manifold flow path 3 and the intermediate flow path 4 for supplying fluid to another source. The partition 4a separates different types of fluids. For example, a partition 42a for separating a second fluid is provided between the first manifold flow path 31 and the second intermediate flow path 42, and a partition 41a for separating a first fluid is provided between the second manifold flow path 32 and the first intermediate flow path 41. Additionally, although not shown, a partition for separating a second fluid is provided, for example, between the third manifold flow path 33 and the fourth intermediate flow path, and a partition for separating a first fluid is provided between the fourth manifold flow path 34 and the third intermediate flow path. The partition 4a between the manifold flow path 3 and the intermediate flow path 4 for supplying fluid to another source extends along the extension direction of the inner flow path 2 (see reference). Figure 5 For example, the partition 42a between the first manifold flow path 31 and the second intermediate flow path 42 for the second fluid flow is along the extending direction of the second flow path 22. Additionally, for example, the partition 41a between the second manifold flow path 32 and the first intermediate flow path 41 for the first fluid flow is along the extending direction of the first flow path 21. Furthermore, although not shown, for example, the partition between the third manifold flow path 33 and the fourth intermediate flow path for the second fluid flow is along the extending direction of the second flow path 22. Additionally, for example, the partition between the fourth manifold flow path 34 and the first flow path 21 for the first fluid flow is along the extending direction of the first flow path 21.

[0045] like Figure 5 As shown, with a heat exchange core 1 having a partition 4a extending along the internal flow path 2, the partition 4a separating different types of fluids does not become an overhanging shape, thus enabling the partition to be thin-walled. Therefore, the manifold flow path 3 can be moved closer to the inner side of the internal flow path configuration area, achieving a compact heat exchange core 1.

[0046] For example, in Figure 5In the illustrated example, the partition wall 4a between the header flow path 3 and the intermediate flow path 4 is thinned, and the intermediate flow path 4 is brought close to the header flow path 3. In addition, the intermediate flow path side of the partition wall 4a is formed of a rectangular cross section when viewed from a direction orthogonal to the intermediate flow path 4, but a slope surface, for example, of 45 degrees, which is inclined toward the intermediate flow path side, can be provided.

[0047] [Inner wall 3a of header flow path 3]

[0048] The inner wall 3a of the header flow path 3 has a larger surface roughness than the flow path wall 2a of the internal flow path 2. For example, in a case where the first header flow path 31, the second header flow path 32, the third header flow path 33, and the fourth header flow path 34 are provided on the outside of a rectangular parallelepiped, the inner walls 31a, 32a, 33a, 34a of these first header flow path 31, the second header flow path 32, the third header flow path 33, and the fourth header flow path 34 have a larger surface roughness than the flow path walls 21a, 22a of the first flow path 21 and the second flow path 22.

[0049] For example, in Japanese Industrial Standards (JIS), as parameters indicating surface roughness, definitions and representations of arithmetic average roughness (Ra), maximum height (Ry), ten-point average roughness (Rz), average spacing of concavities and convexities (Sm), average spacing of local peaks (S), and load length ratio (tp) are prescribed. Surface roughness is the arithmetic average of each portion randomly extracted from the surface of an object.

[0050] According to the heat exchange core 1 having the inner wall 3a of the header flow path 3, the inner wall 3a of the header flow path 3 has a larger surface roughness than the flow path wall 2a of the internal flow path 2, and thus in a case where the heat exchange core 1 is molded by additive manufacturing, the molding time per unit volume of a portion where the header flow path 3 is provided can be made shorter than a portion where the internal flow path 2 is provided. Therefore, the molding time of the entire heat exchange core 1 can also be shortened, and thus the manufacturing cost of the heat exchange core 1 can be reduced.

[0051] The plurality of internal flow paths 2 extend in parallel to each other, and the inner wall 3a of the header flow path 3 includes a first region 3a1 and a second region 3a2. The first region 3a1 is a non-overhanging region on one side in the extension direction of the plurality of internal flow paths 2, and has a first surface roughness. The second region 3a2 is an overhanging region on the other side in the plurality of internal flow paths 2, and has a second surface roughness that is larger than the first surface roughness. Furthermore, the first surface roughness of the inner wall 3a of the header flow path 3 is larger than the surface roughness of the flow path wall 2a of the plurality of internal flow paths 2.

[0052] According to the heat exchange core 1 having the inner wall 3a of the header flow path 3 including such first region 3a1 and second region 3a2, the second surface roughness of the second region (overhang region) 3a2 of the header flow path 3 is equal to or greater than the first surface roughness of the first region (non-overhang region) 3a1, and the first region (non-overhang region) 3a1 has a greater surface roughness than the flow path wall 2a of the plurality of internal flow paths 2.

[0053] Therefore, the second surface roughness of the second region 3a2 is equal to or greater than the first surface roughness of the first region 3a1, and the first surface roughness of the first region (non-overhang region) 3a1 is equal to or less than the second surface roughness of the second region (overhang region) 3a2. This enables the molding time per unit area of the portion provided with the first region 3a1 to be shorter than the portion provided with the plurality of internal flow paths 2. Therefore, the molding time of the entire heat exchange core 1 can also be shortened, and thus the manufacturing cost of the heat exchange core 1 can be reduced.

[0054] That is, the first surface roughness of the first region (non-overhang region) 3a1 is equal to or less than the second surface roughness of the second region (overhang region) 3a2, and this enables the molding time per unit area of the portion provided with the first region 3a1 to be shorter than the portion provided with the plurality of internal flow paths 2. Therefore, the molding time of the entire heat exchange core 1 can also be shortened, and thus the manufacturing cost of the heat exchange core 1 can be reduced.

[0055] As shown in FIG. 1, the second region 3a2 includes an inclined surface having an angle θ of 60 degrees or less, preferably 45 degrees or less, with respect to the extension direction of the plurality of internal flow paths 2. Figure 4 As shown in FIG. 1, the second region 3a2 includes an inclined surface having an angle θ of 60 degrees or less, preferably 45 degrees or less, with respect to the extension direction of the plurality of internal flow paths 2. Figure 5 As shown in FIG. 1, the second region 3a2 includes an inclined surface having an angle θ of 60 degrees or less, preferably 45 degrees or less, with respect to the extension direction of the plurality of internal flow paths 2.

[0056] As shown in FIG. 1, the second region 3a2 includes an inclined surface having an angle θ of 60 degrees or less, preferably 45 degrees or less, with respect to the extension direction of the plurality of internal flow paths 2. Figure 1 As shown in FIG. 1, the second region 3a2 includes an inclined surface having an angle θ of 60 degrees or less, preferably 45 degrees or less, with respect to the extension direction of the plurality of internal flow paths 2.

[0057] For example, the lower half is formed as a curved groove having a circular arc shape in cross section, but is not limited thereto, and may, for example, be formed as a groove having a rectangular cross section, a groove having an inverted triangular cross section, or the like. In this way, it is possible to ensure a larger flow path cross-sectional area than a groove having a rectangular cross section, a groove having an inverted triangular cross section, or the like, and it is possible to suppress the wall thickness of the first region 3a1. In addition, the upper half is formed as a roof type having an isosceles triangular cross section, but is not limited thereto.

[0058] According to the heat exchange core 1 with an inner wall 3a of such a manifold flow path 3, the angle between the inclined surface of the second region 3a2 constituting the manifold flow path 3 and the extending direction of the plurality of internal flow paths 2 is 60 degrees, preferably 45 degrees or less. Therefore, when the heat exchange core 1 is shaped by a stacking process, if the extending direction of the internal flow path 2 is set as the stacking direction and the internal flow path 2 takes priority over the manifold flow path 3, it is possible to avoid problems such as poor shaping due to overhanging shape deformation and warping of the shaped product caused by residual stress generated during shaping, resulting in reduced accuracy (hereinafter referred to as "overhanging problems"), while also including the manifold flow path 3 in the stacking process. In addition, since the position of the second region 3a2 of the manifold flow path 3 can be used as a reference to determine the vertical position of the heat exchange core 1, the possibility of incorrectly setting the vertical position of the heat exchange core 1 can be reduced.

[0059] [Configuration of manifold flow path 3]

[0060] like Figure 4 As shown, the manifold flow path 3 is at least partially disposed within the formation range 2A of the plurality of internal flow paths 2 in the extension direction of the plurality of internal flow paths 2. For example, the first manifold flow path 31 is at least partially disposed within the formation range 2A of the first flow path 21 in the extension direction of the first flow path 21. Thus, the first manifold flow path 31 overlaps with the first flow path 21 in the extension direction of the first flow path 21. Although not shown, for example, the second manifold flow path 32 is at least partially disposed within the formation range of the second flow path 22 in the extension direction of the second flow path 22. Thus, the second manifold flow path 32 overlaps with the second flow path 22 in the extension direction of the second flow path 22. For example, the third manifold flow path 33 is at least partially disposed within the formation range of the first flow path 21 in the extension direction of the first flow path 21. Thus, the third manifold flow path 33 overlaps with the first flow path 21 in the extension direction of the first flow path 21. For example, the fourth manifold flow path 34 is at least partially disposed within the formation range of the second flow path 22 in the extension direction of the second flow path 22. Therefore, the fourth manifold flow path 34 overlaps with the second flow path 22 in the direction of extension of the second flow path 22.

[0061] With this configuration of the manifold flow path 3, the heat exchange core 1 is positioned within the forming range 2A of the extension direction of the multiple internal flow paths 2. Therefore, the size of the heat exchange core 1 in the extension direction of the multiple internal flow paths 2 can be suppressed, achieving a compact heat exchange core 1. Since the manifold flow path 3 is formed within the forming range 2A of the multiple internal flow paths 2, overhang of the manifold flow path 3 becomes a problem. However, the inclined surface of the second region 3a2 of the inner wall 3a of the aforementioned manifold flow path 3 eliminates the overhang problem. Therefore, a compact heat exchange core 1 can be efficiently manufactured through a layered design while avoiding the overhang problem.

[0062] [Curved surface 3a3 of inner wall 3a of header flow path 3]

[0063] As shown in Figure 4 and Figure 5 , the heat exchange core 1 has the intermediate flow path 4 adjacent to the end portion of the internal flow path 2. The inner wall 3a of the header flow path 3 includes the curved surface 3a3 having a circular arc shape, and the partition wall 4a has a portion of the curved surface 3a3 on the surface. Also, the curvature center 3a31 of the curved surface 3a3 is located within the formation range 4A of the intermediate flow path 4 in the extension direction of the internal flow path 2.

[0064] According to the heat exchange core 1 having the header flow path 3 with such an inner wall curved surface, in the inner wall 3a of the header flow path 3 having the curved surface 3a3 of the circular arc shape, the tangent direction of the circular arc shape can be made to follow the extension direction of the internal flow path 2, and the thinning of the partition wall 4a can be achieved by a simple header flow path shape.

[0065] [Multiple header flow paths 3]

[0066] As shown in Figure 1 , the heat exchange core 1 includes a pair of header flow paths 3 located on both end sides of multiple internal flow paths 2. Also, a pair of second regions 3a2 are provided on the same side with respect to the first region 3a1. For example, the heat exchange core 1 includes a pair of header flow paths 3, a first header flow path 31 and a third header flow path 33, located on both end sides of the first flow path 21. Also, the second region 3a2 of the first header flow path 31 and the second region 3a2 of the third header flow path 33 are provided on the same side with respect to the first region 3a1. For example, the first header flow path 31 and the third header flow path 33 are provided with the first region 3a1 on the lower side in the direction of gravity and with the second region 3a2 on the upper side, respectively. Also, for example, the heat exchange core 1 includes a pair of header flow paths 3, a second header flow path 32 and a fourth header flow path 34, located on both end sides of the second flow path 22. Also, the second region 3a2 of the second header flow path 32 and the second region 3a2 of the fourth header flow path 34 are provided on the same side with respect to the first region 3a1. For example, the second header flow path 32 and the fourth header flow path 34 are provided with the first region 3a1 on the lower side in the direction of gravity and with the second region 3a2 on the upper side, respectively.

[0067] According to the heat exchange core 1 including such multiple header flow paths 3, the second regions 3a2 of the pair of header flow paths 3 are provided on the same side with respect to the first region 3a1, and thus, even in a case where the extension direction of the internal flow path 2 is set as the stacking direction with the internal flow path 2 being given priority over the header flow path 3, the pair of header flow paths 3 can be stacked while avoiding the problem of overhang. Also, since the upper and lower of the heat exchange core 1 can be determined based on which position the second region 3a2 of the header flow path 3 is located, the possibility of erroneously setting the upper and lower of the heat exchange core 1 can be reduced.

[0068] [Side view of the main body of heat exchange core 1]

[0069] like Figure 2 As shown, at least a portion of the manifold flow path 3, when viewed from above in the extending direction of the plurality of internal flow paths 2, is located in a manifold region that deviates outward from the arrangement area of ​​the plurality of internal flow paths 2. Furthermore, when viewed from above, the main body 11 has a side portion extending along the internal flow path 2 closer to the arrangement area of ​​the internal flow path 2 than the portion of the manifold region that deviates most outward from the arrangement area of ​​the internal flow path 2 (see reference). Figure 4 as well as Figure 5 ).

[0070] According to the heat exchange core 1 having such a main body side surface, when viewed from above, the main body side surface extends along the extension direction of the internal flow path 2 closer to the configuration area than the part of the manifold area that is furthest from the configuration area. Therefore, the wall thickness of the outer wall (side wall) including the main body side surface can be reduced, and the time required to shape the outer wall including the main body side surface can be shortened. As a result, the manufacturing cost of the heat exchange core 1 can also be reduced.

[0071] [Outer wall (upper wall) 116 of heat exchange core 1]

[0072] like Figure 4 and Figure 5 As shown, the heat exchange core 1 includes an intermediate flow path 4 for connecting a plurality of internal flow paths 2 with a manifold flow path 3. The intermediate flow path 4 opens into the plurality of internal flow paths 2, and is separated from the outside by an outer wall (upper wall) 116. Furthermore, the outer wall (upper wall) 116 that separates the intermediate flow path 4 from the outside is recessed toward the internal flow path 2 relative to the manifold 12 along the extending direction of the intermediate flow path 4.

[0073] According to the heat exchange core 1 having such an outer wall (upper wall) 116, the outer wall (upper wall) 116, which is separated from the middle flow path 4 by the outside, is recessed toward the inner flow path 2. Therefore, compared with the case where the outer wall (upper wall) 116 is not recessed toward the inner flow path 2, the outer wall (upper wall) 116 can be made lighter.

[0074] [The positional relationship between internal flow path 2, intermediate flow path 4, and manifold flow path 3]

[0075] like Figure 4 As shown, the manifold flow path 3 is located at least partially on the opposite side of the internal flow path 2, across the intermediate flow path 4, in the direction of extension of the internal flow path 2.

[0076] By employing the positional relationship between the internal flow path 2, the intermediate flow path 4, and the manifold flow path 3, the cross-sectional area of ​​the manifold flow path 3 can be adequately ensured, and the wall thickness of the outer wall separating the intermediate flow path 4 from the outside can be suppressed. By suppressing the wall thickness in this way, the molding volume is reduced, thus shortening the molding time and reducing the amount of metal used. Consequently, the manufacturing cost of the heat exchange core 1 can also be lowered.

[0077] [Additional Structure to Heat Exchange Core 1]

[0078] like Figure 6 As shown, the heat exchange core 1 may also have a connecting pipe 13 protruding from the manifold section 12 in the direction of extending into the manifold flow path 3. The connecting pipe 13 has a connecting flow path 5 communicating with the manifold flow path 3. In this way, the heat exchange core 1 with the connecting pipe 13 can easily connect a fluid supply pipe (fluid supply path) connected to a fluid supply source or a fluid discharge pipe (fluid discharge path) connected to a fluid discharge destination to the heat exchange core 1 (connecting pipe 13).

[0079] like Figure 6 As shown, the inner wall 5a of the connecting flow path 5 includes a third region 5a3 and a fourth region 5a4. The third region 5a3 is a non-overhanging region connected to the first region 3a1 of the manifold flow path 3 and located on one side of the extension direction of the plurality of internal flow paths 2. The fourth region 5a4 is an overhanging region connected to the second region 3a2 of the manifold flow path 3 and located on the other side of the extension direction of the plurality of internal flow paths 2. The fourth region 5a4, like the second region 3a2 of the manifold flow path 3, includes an inclined surface with an angle of 60 degrees or less, preferably 45 degrees or less, relative to the extension direction of the plurality of internal flow paths 2.

[0080] For example, the wall thickness of the connecting pipe 13 is constant, and the lower half of the cross-section is arc-shaped, while the upper half of the cross-section is mountain-shaped. However, it is not limited to this; the outer periphery of the connecting pipe 13 can also have a circular cross-section.

[0081] Alternatively, the connecting pipe 13 may also have a support portion 14 that supports the connecting pipe 13 from the manifold 12. In this way, the connecting pipe 13 with the support portion 14 that supports the connecting pipe 13 from the manifold 12 can be manufactured together with the main body of the heat exchange core 1 through a layered molding process.

[0082] Based on the heat exchange core 1 with an inner wall 5a having such a connecting flow path 5, the angle between the inclined surface of the fourth region 5a4 constituting the connecting flow path 5 and the extending direction of the plurality of internal flow paths 2 is 60 degrees, preferably 45 degrees or less. Therefore, when the connecting pipe 13 and the heat exchange core 1 are molded together by a stacked molding process, the problem of overhang can be avoided while performing the stacked molding. In addition, the position of the fourth region 5a4 of the connecting pipe 13 can be used as a reference to determine the vertical position of the heat exchange core 1, thereby reducing the possibility of incorrectly setting the vertical position of the heat exchange core 1.

[0083] [Multiple connecting pipes 13]

[0084] like Figure 6 As shown, the heat exchange core 1 includes a pair of connecting pipes 13 located at both ends of a plurality of internal flow paths 2. Furthermore, a pair of fourth regions 5a4 are disposed on the same side relative to the third region 5a3. For example, the heat exchange core 1 includes a pair of connecting pipes 13, a first connecting pipe 131, and a third connecting pipe 133 located at both ends of a first flow path 21. The fourth regions 5a4 of the first connecting pipe 131 and the fourth regions 5a4 of the third connecting pipe 133 are disposed on the same side relative to the third region 5a3. For example, the first connecting pipe 131 and the third connecting pipe 133 each have a third region 5a3 located on the lower side in the direction of gravity and a fourth region 5a4 located on the upper side. Alternatively, for example, the heat exchange core 1 includes a pair of connecting pipes 13, a second connecting pipe 132, and a fourth connecting pipe 134 located at both ends of a second flow path 22. Furthermore, the fourth region 5a4 of the second connecting pipe 132 and the fourth region 5a4 of the fourth connecting pipe 134 are located on the same side relative to the third region 5a3. For example, the second connecting pipe 132 and the fourth connecting pipe 134 are respectively provided with the third region 5a3 on the lower side in the direction of gravity and the fourth region 5a4 on the upper side.

[0085] Based on the heat exchange core 1 including multiple connecting pipes 13, the fourth region 5a4 of a pair of connecting pipes 13 is located on the same side relative to the third region 5a3. Therefore, even if the extension direction of the internal flow path 2 is set as the stacking direction, prioritizing the connecting pipes 13 over the internal flow path 2, a stacked design including a pair of connecting pipes 13 can be achieved while avoiding overhang issues. Furthermore, the vertical position of the heat exchange core 1 can be determined based on the location of the fourth region 5a4 of the connecting pipes 13, thus reducing the risk of incorrectly setting the vertical position of the heat exchange core 1.

[0086] [Adapter 15 for heat exchange core 1]

[0087] like Figure 7As shown, the heat exchange core 1 may also have an adapter 15 in the manifold 12. The adapter 15 changes the flow path cross-sectional shape between the fluid supply pipe 16 or the fluid discharge pipe 17 and the manifold 12, for example, by engaging with the manifold 12 of the heat exchange core 1. The adapter 15 has the same flow path cross-sectional shape 15a as the fluid supply pipe 16 or the fluid discharge pipe 17 on the fluid supply pipe 16 or fluid discharge pipe 17 side, and has the same flow path cross-sectional shape 15b as the manifold flow path 3 on the manifold 12 side. The fluid supply pipe 16 or fluid discharge pipe 17 side of the adapter 15 communicates with the manifold 12 side, maintaining the flow path cross-sectional area and changing the flow path cross-sectional shape from the fluid supply pipe 16 or fluid discharge pipe 17 side toward the manifold 12 side.

[0088] According to the heat exchange core 1 equipped with such an adapter 15, even if the flow path cross-sectional shape of the fluid supply pipe 16 or the fluid discharge pipe 17 is different from the flow path cross-sectional shape of the manifold flow path 3, the fluid supply pipe 16 or the fluid discharge pipe 17 can still be connected to the manifold 12. Furthermore, since the flow path cross-sectional area is maintained from the fluid supply pipe 16 or the fluid discharge pipe 17 side toward the manifold 12 side and the flow path cross-sectional shape changes, pressure loss of the fluid flowing from the fluid supply pipe 16 to the manifold flow path 3 or from the manifold flow path 3 to the flow path discharge pipe can be suppressed.

[0089] [Heat Exchanger 6]

[0090] like Figure 8 As shown, the heat exchanger 6 of the present disclosure includes the heat exchange core 1 described above and a housing 7 that houses the heat exchange core 1. The housing 7 includes: a fitting recess 71 for fitting the connecting pipe 13 when the heat exchange core 1 is housed; and a flow path 72 that communicates with the connecting flow path 5 when the connecting pipe 13 is fitted into the fitting recess 71. It should be noted that when the connecting pipe 13 has a support portion 14, the housing 7 includes the support portion 14 when the heat exchange core 1 is housed, and the connecting pipe 13 is fitted into the fitting recess 71.

[0091] According to this heat exchanger 6, a heat exchange core 1 is housed in a housing 7, and a connecting pipe 13 is fitted into a fitting recess 71, thereby connecting flow path 5 and flow path 72. Therefore, by housing the heat exchange core 1 in the housing 7, flow path 5 and flow path 72 can be connected. In addition, since the connecting pipe 13 is fitted into the fitting recess 71, there is little looseness between the connecting pipe 13 and the fitting recess 71, and no fine-tuning is required.

[0092] In addition, although not specifically illustrated, if a heat exchanger 6 is formed by providing multiple receiving recesses in the housing 7 and housing multiple heat exchange cores 1 in the housing 7, the heat exchange capacity of the heat exchanger 6 can be increased (it can be raised).

[0093] In addition, for example, in a case where the wall thickness of the connection pipe 13 is constant, and the cross section of the lower half is circular arc-shaped, and the cross section of the upper half is mountain-shaped, if the upper and lower of the heat exchange core 1 are mistaken, the connection pipe 13 is caught in the fitting recess 71 and cannot be fitted, and thus a state where the upper and lower of the heat exchange core 1 are mistaken can be prevented.

[0094] In addition, although not shown, in a case where the above-described heat exchange core 1 is provided with the adapter 15, the housing 7 can be provided with the adapter 15 fitted in the fitting recess 71 in a state where the heat exchange core 1 is housed. In this way, by housing the heat exchange core 1 in the housing 7, and fitting the adapter 15 in the fitting recess 71, the header flow path 3 and the flow path 72 are communicated, and thus by housing the heat exchange core 1 in the housing 7, the header flow path 3 and the flow path 72 can be connected. In this example, a sealing function between the fitting recess 71 and the adapter 15 can be provided.

[0095] [Manufacturing method of heat exchange core 1]

[0096] The manufacturing method of the heat exchange core 1 of the embodiment of the present disclosure is a manufacturing method of a heat exchange core 1 provided with a plurality of internal flow paths 2 extending in parallel to each other, and a header flow path 3 communicating with the plurality of internal flow paths 2. The manufacturing method of the heat exchange core 1 includes a step of forming the internal flow paths 2 by performing layering molding in the extension direction of the internal flow paths 2, and a step of forming the header flow path 3 by performing layering molding in the extension direction of the internal flow paths 2. In the manufacturing method of the heat exchange core 1, the inner wall 3a of the header flow path 3 has a larger surface roughness than the flow path wall 2a of the internal flow paths 2.

[0097] According to such a manufacturing method of the heat exchange core 1, the inner wall 3a of the header flow path 3 has a larger surface roughness than the flow path wall 2a of the internal flow paths 2, and thus the molding time per unit volume in the step of forming the header flow path 3 can be made shorter than the portion where the internal flow paths 2 are provided. Therefore, the molding time of the entire heat exchange core 1 can be shortened, and thus the manufacturing cost of the heat exchange core 1 can be reduced.

[0098] In addition, in the manufacturing method of the heat exchange core 1, the inner wall 3a of the header flow path 3 has a first region 3a1 and a second region 3a2. The first region 3a1 is located on one side in the extension direction of the plurality of internal flow paths 2, and the second region 3a2 is located on the other side in the extension direction of the plurality of internal flow paths 2, and includes an inclined surface having an angle of 60 degrees or less, and preferably 45 degrees or less, with respect to the extension direction of the plurality of internal flow paths 2.

[0099] According to the manufacturing method of such a heat exchange core 1, the angle formed by the inclined surface of the second region 3a2 of the header flow path 3 with respect to the extension direction of the internal flow path 2 is 60 degrees or less and preferably 45 degrees or less, so even in the case where the internal flow path 2 is stacked in the flow path direction with priority over the header flow path 3, the stacking molding including the header flow path 3 can be performed while avoiding the problem of overhang.

[0100] [Stacking molding of internal flow path 2 and header flow path 3]

[0101] The stacking molding of the internal flow path 2 and the header flow path 3 includes a step of spreading the metal powder and a repeated action of a series of cycles of imparting energy to the metal powder to melt and solidify the metal powder. As shown in Figure 9 In this stacking molding, the header flow path 3 is at least partially disposed within the formation range 2A of the plurality of internal flow paths 2 in the extension direction of the plurality of internal flow paths 2, and the portion where the header flow path 3 is provided (header portion 12) and the portion where the plurality of internal flow paths 2 are provided (main body portion 11) are molded by a series of cycles.

[0102] According to the manufacturing method of such a heat exchange core 1, the header flow path 3 is disposed within the formation range 2A of the plurality of internal flow paths 2 in the extension direction, and the portion where the header flow path 3 is provided and the portion where the plurality of internal flow paths 2 are provided are molded by a series of cycles, so the size of the heat exchange core 1 in the extension direction of the internal flow path 2 can be suppressed, the heat exchange core 1 can be compact, and the molding time of the heat exchange core 1 can be shortened.

[0103] [Imparting frequency of energy]

[0104] In the step of melting and solidifying the metal powder, the imparting frequency of energy imparted to the portion where the header flow path 3 is provided (header portion 12) is less than that of the portion where the plurality of internal flow paths 2 are provided (main body portion 11). For example, in the case where the metal powder is melted and solidified by laser irradiation in the above-described stacking molding of the internal flow path 2 and the header flow path 3, the number of times of irradiating the metal powder with laser light is made the same as the number of times of spreading the metal powder in the stacking molding of the portion where the internal flow path 2 is provided (main body portion 11), whereas the number of times of irradiating the metal powder with laser light is made half the number of times of spreading the metal powder in the stacking molding of the portion where the header flow path 3 is provided (header portion 12). That is, in the stacking molding of the main body portion 11, the number of times of irradiating the laser light is set to 1 time with respect to 1 time of spreading the metal powder, whereas in the stacking molding of the header portion 12, the number of times of irradiating the laser light is set to 1 time with respect to 2 times of spreading the metal powder. In other words, in the stacking molding of the main body portion 11, the laser light is irradiated every time the metal powder is spread, whereas in the stacking molding of the header portion 12, the irradiation of the laser light is skipped every 2 times.

[0105] According to the manufacturing method of the heat exchange core 1, the frequency of energy imparted to the portion provided with the header flow path 3 is lower than that of the portion provided with the internal flow path 2, and thus the modeling time per unit area of the portion provided with the header flow path 3 can be made shorter than that of the portion provided with the internal flow path 2. Therefore, the modeling time of the entire heat exchange core 1 can be shortened, and thus the manufacturing cost of the heat exchange core 1 can be reduced. That is, in the above-described example, in the layering modeling of the main body portion 11, laser is irradiated each time the metal powder is spread, whereas in the layering modeling of the header portion 12, laser irradiation is skipped once every two times, and thus the modeling time can be shortened by the amount of the skipped time, and the manufacturing cost of the heat exchange core 1 can be reduced.

[0106] In addition, the frequency of energy imparted to the portion forming the first region 3al is lower than that of the portion forming the second region 3a2. For example, in a case where the metal powder is melted and solidified by laser irradiation in the layering modeling of the header flow path 3, the number of times laser is irradiated to the metal powder is made the same as the number of times the metal powder is spread in the layering modeling of the portion constituting the second region 3a2, whereas the number of times laser is irradiated to the metal powder is made half the number of times the metal powder is spread in the layering modeling of the portion constituting the first region 3al. That is, in the layering modeling of the second region 3a2, the number of times laser is irradiated is made one time with respect to one time of spreading the metal powder, whereas in the layering modeling of the first region 3al, the number of times laser is irradiated is made one time with respect to two times of spreading the metal powder. In other words, in the layering modeling of the second region 3a2, laser is irradiated each time the metal powder is spread, whereas in the layering modeling of the first region 3al, laser irradiation is skipped once every two times.

[0107] According to the manufacturing method of the heat exchange core 1, the frequency of energy imparted to the portion forming the first region 3al is lower than that of the portion forming the second region 3a2, and thus the modeling time per unit area of the portion constituting the first region 3al can be made shorter than that of the portion constituting the second region 3a2. Therefore, the modeling time of the entire heat exchange core 1 can be shortened, and thus the manufacturing cost of the heat exchange core 1 can be reduced. That is, in the above-described example, in the layering modeling of the second region 3a2, laser is irradiated each time the metal powder is spread, whereas in the layering modeling of the first region 3al, laser irradiation is skipped once every two times, and thus the modeling time can be shortened by the amount of the skipped time, and the manufacturing cost of the heat exchange core 1 can be reduced.

[0108] The present application is not limited to the above-described embodiments, and includes modes in which the above-described embodiments are modified and modes in which the above-described embodiments are appropriately combined.

[0109] The content described in each of the above-described embodiments is grasped, for example, as follows.

[0110] [1] A heat exchange core (1) according to one aspect includes:

[0111] a plurality of internal flow paths (2); and

[0112] a header flow path (3) that communicates with the plurality of internal flow paths (2),

[0113] an inner wall (3a) of the header flow path (3) has a surface roughness that is greater than a flow path wall (2a) of the plurality of internal flow paths (2).

[0114] For example, in Japanese Industrial Standards (JIS), as parameters that represent surface roughness, definitions and representations of an arithmetic average roughness (Ra), a maximum height (Ry), a ten-point average roughness (Rz), an average spacing of irregularities (Sm), an average spacing of local peaks (S), and a load length ratio (tp) are prescribed, and surface roughness is an arithmetic average of each portion randomly extracted from a surface of an object.

[0115] According to the heat exchange core (1) of the present disclosure, the inner wall (3a) of the header flow path (3) has a surface roughness that is greater than the flow path wall (2a) of the plurality of internal flow paths (2), so in the case where the heat exchange core (1) is molded by additive molding, the molding time per unit volume of a portion in which the header flow path (3) is provided can be made shorter than a portion in which the internal flow path (2) is provided. Therefore, the molding time can also be shortened overall in the heat exchange core (1), so the manufacturing cost of the heat exchange core (1) can be reduced.

[0116] [2] A heat exchange core (1) according to another aspect, further including:

[0117] the plurality of internal flow paths (2) extend in parallel to each other,

[0118] the inner wall (3a) of the header flow path (3) includes:

[0119] a first region (non-overhanging region) (3a1) that is located on one side in the extension direction of the plurality of internal flow paths (2) and has a first surface roughness; and

[0120] a second region (overhanging region) (3a2) that is located on the other side in the extension direction and has a second surface roughness that is greater than the first surface roughness,

[0121] the first surface roughness of the inner wall (3a) of the header flow path (3) is greater than the surface roughness of the flow path wall (2a) of the plurality of internal flow paths (2).

[0122] According to such a structure, the second surface roughness of the second region (overhang region) (3a2) of the header flow path (3) is equal to or greater than the first surface roughness of the first region (non-overhang region) (3a1), and the first surface roughness of the first region (non-overhang region) (3a1) is greater than the surface roughness of the flow path wall (2a) of the plurality of internal flow paths (2).

[0123] Therefore, the second surface roughness of the second region (3a2) is equal to or greater than the first surface roughness of the first region (3a1), and the first surface roughness of the first region (3a1) is greater than the surface roughness of the flow path wall (2a) of the plurality of internal flow paths (2).

[0124] That is, the first surface roughness of the first region (non-overhang region) (3a1) is equal to or less than the second surface roughness of the second region (overhang region) (3a2), and the molding time per unit area of the portion provided with the first region (3a1) can be made shorter than the portion provided with the plurality of internal flow paths (2). Therefore, the molding time of the entire heat exchange core (1) can also be shortened, and thus the manufacturing cost of the heat exchange core (1) can be reduced.

[0125] [3] Another heat exchange core (1) according to any one of [1] or [2], wherein

[0126] The header flow path (3) is disposed at least partially within the formation range (2A) of the plurality of internal flow paths (2) in the extension direction of the plurality of internal flow paths (2).

[0127] According to such a structure, the header flow path (3) is disposed within the formation range (2A) of the plurality of internal flow paths (2) in the extension direction of the plurality of internal flow paths (2), and thus the size of the heat exchange core (1) in the extension direction of the plurality of internal flow paths (2) can be suppressed, and the heat exchange core (1) can be made compact.

[0128] [4] Another heat exchange core (1) according to any one of [1] to [3], wherein

[0129] The partition wall (4a) between the header flow path (3) and the intermediate flow path (4) for the flow of the other fluid is along the extension direction of the plurality of internal flow paths (2).

[0130] According to such a structure, the partition wall (4a) that separates different kinds of fluids does not have an overhang shape, and thus the partition wall (4a) can be made thin-walled. Therefore, the header flow path (3) can be disposed closer to the inside of the region of the plurality of internal flow paths (2), and the heat exchange core (1) can be made compact.

[0131] [5] Another heat exchange core (1) according to any one of [1] to [3], wherein

[0132] The heat exchange core (1) is provided with an intermediate flow path (4) disposed adjacent to end portions of the plurality of internal flow paths (2),

[0133] The inner wall (3a) of the header flow path (3) includes a curved surface (3a3) having a circular arc shape, and the partition wall (4a) has a portion of the curved surface (3a3) on a surface,

[0134] A curvature center (3a31) of the curved surface (3a3) is located within a formation range (4A) of the intermediate flow path (4) in an extension direction of the plurality of internal flow paths (2).

[0135] According to such a structure, in the inner wall of the header flow path (3) having the curved surface (3a3) of the circular arc shape, the tangent direction of the circular arc shape is made to follow the extension direction of the plurality of internal flow paths (2), and thinning of the partition wall (4a) can be achieved by a simple header flow path shape.

[0136] [6] Another heat exchange core (1) according to the above [1], wherein

[0137] The plurality of internal flow paths (2) extend in parallel to each other, and on the other hand,

[0138] The header flow path (3) communicates with the plurality of internal flow paths (2) at end portions of the plurality of internal flow paths (2) in the extension direction of the plurality of internal flow paths (2),

[0139] The inner wall (3a) of the header flow path (3) has:

[0140] a first region (3a1) located on one side in the extension direction of the plurality of internal flow paths (2); and

[0141] a second region (3a2) located on the other side in the extension direction and including an inclined surface having an angle of 60 degrees or less with respect to the extension direction.

[0142] According to such a structure, the angle of the inclined surface of the second region (3a2) of the header flow path (3) with respect to the extension direction of the plurality of internal flow paths (2) is 60 degrees or less, and therefore even in a case where the extension direction of the plurality of internal flow paths (2) is set as the stacking direction in preference to the header flow path (3), the header flow path (3) can be stacked while avoiding the problem of overhang.

[0143] In addition, since the upper and lower sides of the heat exchange core (1) can be determined based on which position the second region (3a2) of the header flow path (3) is located, the risk of erroneously setting the upper and lower sides of the heat exchange core (1) can be reduced.

[0144] [7] Another heat exchange core (1) according to any one of [6] to [8] wherein,

[0145] The header flow path (3) is at least partially disposed within the formation range (2A) of the plurality of internal flow paths (2) in the extension direction of the plurality of internal flow paths (2).

[0146] According to such a structure, the header flow path (3) is disposed within the formation range (2A) of the plurality of internal flow paths (2) in the extension direction of the plurality of internal flow paths (2), and thus the size of the heat exchange core (1) in the extension direction of the plurality of internal flow paths (2) can be suppressed, and the heat exchange core (1) can be made compact. Since the header flow path (3) is formed within the formation range (2A) of the plurality of internal flow paths (2) in the extension direction of the plurality of internal flow paths (2), overhang of the header flow path (3) becomes a problem, but this problem can be eliminated by the structure of [6] described above. Thus, the compact heat exchange core (1) can be efficiently manufactured by additive manufacturing while avoiding the problem of overhang.

[0147] [8] Another heat exchange core (1) according to any one of [6] to [7] wherein,

[0148] The heat exchange core (1) includes a pair of the header flow paths (3) respectively located on both end sides of the plurality of internal flow paths (2), and the second region (3a2) of the pair of the header flow paths (3) is disposed on the same side with respect to the first region (3a1).

[0149] According to such a structure, the second region (3a2) of the pair of the header flow paths (3) is disposed on the same side with respect to the first region (3a1), and thus even in a case where the extension direction of the plurality of internal flow paths (2) is set as the stacking direction in preference to the header flow paths (3), the plurality of internal flow paths (2) can be stacked while avoiding the problem of overhang, including the pair of the header flow paths (3). In addition, since the upper and lower sides of the heat exchange core (1) can be determined based on which position the second region (3a2) of the header flow path (3) is located, the possibility of erroneously setting the upper and lower sides of the heat exchange core (1) can be reduced.

[0150] [9] Yet another heat exchange core (1) according to any one of [6] to [8] wherein,

[0151] The first region (3a1) is formed in a groove shape in which a circular arc shape is formed in a cross section.

[0152] According to such a structure, the first region (3a1) is formed as a groove-shaped trench having a circular arc shape in cross section, and thus a larger flow path cross-sectional area than a groove-shaped trench having a rectangular cross section, a groove-shaped trench having an inverted triangular cross section, or the like can be ensured, and the wall thickness of the first region (3a1) can be suppressed.

[0153]

[10] Another heat exchange core (1) according to any one of [6] to [9] above, wherein

[0154] The heat exchange core (1) includes:

[0155] a main body portion (11) having the plurality of internal flow paths (2); and

[0156] a header portion (12) having the header flow path (3) on at least one end portion side of the main body portion (11),

[0157] at least a portion of the header flow path (3) is located in a region deviated outward from the arrangement region of the plurality of internal flow paths (2) when viewed from above in an extending direction of the plurality of internal flow paths (2),

[0158] the main body portion (11) has a main body portion side surface extending along the extending direction of the plurality of internal flow paths (2) at a position closer to the arrangement region than a position in the header flow path (3) deviated most outward from the arrangement region when viewed from above.

[0159] According to such a structure, the main body portion (11) has a main body portion side surface extending along the extending direction of the plurality of internal flow paths (2) at a position closer to the arrangement region than a position in the header flow path (3) deviated most outward from the arrangement region when viewed from above in the extending direction of the plurality of internal flow paths (2), and thus the distance between the arrangement region and the main body portion side surface can be suppressed. Therefore, the wall thickness of the main body portion side surface can be suppressed, and the heat exchange core (1) can be made lightweight.

[0160]

[11] Another heat exchange core (1) according to

[10] above, wherein

[0161] The heat exchange core (1) includes an intermediate flow path (4) for connecting the header flow path (3) and the plurality of internal flow paths (2) in communication,

[0162] an outer wall (upper wall) (116) separating the intermediate flow path (4) from the outside is recessed toward the extending direction of the intermediate flow path (4) with respect to the header portion (12).

[0163] According to such a structure, the outer wall (upper wall) (116) that separates the intermediate flow path (4) from the outside is recessed in the direction of extension of the intermediate flow path (4) with respect to the header portion (12), and thus, compared to a case in which the outer wall (upper wall) (116) is not recessed in the direction of extension of the intermediate flow path (3), the intermediate region can be made lightweight.

[0164]

[12] Another heat exchange core (1) according to the above

[11] , wherein

[0165] The header flow path (3) is located on opposite sides of the plurality of internal flow paths (2) with the intermediate flow path (4) interposed therebetween at least partially in the direction of extension.

[0166] According to such a structure, the cross-sectional area of the header flow path (3) can be sufficiently ensured, and the problem of the wall thickness of the outer wall that separates the intermediate flow path (4) from the outside becoming excessive and increasing costs can also be eliminated.

[0167]

[13] Another heat exchange core (1) according to any one of the above [1] to

[12] , wherein

[0168] The header flow path (3) is a plurality of

[0169] The flow path opening shapes are different from each other among the plurality of header flow paths (3).

[0170] According to such a structure, when connecting the piping to the heat exchange core (1), connection errors due to differences in flow path opening shape can be prevented.

[0171]

[14] Another heat exchange core (1) according to any one of the above

[10] to

[12] , wherein

[0172] The heat exchange core (1) is provided with a connection piping (13) that protrudes from the header portion (12) in the direction of extension of the header flow path (3),

[0173] The connection piping (13) has a connection flow path (5) that communicates with the header flow path (3).

[0174] According to such a structure, the fluid supply piping (16) that is connected to the fluid supply source or the fluid discharge piping (17) that is connected to the fluid discharge destination can be simply connected to the heat exchange core (1) (connection piping (13)).

[0175]

[15] A heat exchanger (6) according to the above [1], wherein

[0176] The heat exchanger (6) is provided with:

[0177]

[14] the heat exchange core (1); and

[0178] a housing (7) that houses the heat exchange core (1),

[0179] the housing (7) has:

[0180] a fitting recess (71) that fits with the connection pipe (13) in a state in which the heat exchange core (1) is housed therein; and

[0181] a flow path (72) that communicates with the connection flow path (5) in a state in which the connection pipe (13) is fitted in the fitting recess (71).

[0182] According to such a structure, the heat exchange core (1) is housed in the housing (7), the connection pipe (13) is fitted in the fitting recess (71), and thus the connection flow path (5) communicates with the flow path (72), and therefore the connection flow path (5) and the flow path (72) can be connected by housing the heat exchange core (1) in the housing (7).

[0183]

[16] A method of manufacturing a heat exchange core (1) according to the above-mentioned

[15] , wherein

[0184] the heat exchange core (1) has a plurality of internal flow paths (2) that extend in parallel to each other and a header flow path (3) that communicates with the plurality of internal flow paths (2), and

[0185] the method of manufacturing the heat exchange core (1) includes:

[0186] a step of forming the plurality of internal flow paths (2) by performing layering molding along an extension direction of the plurality of internal flow paths (2); and

[0187] a step of forming the header flow path (3) by performing layering molding along the extension direction,

[0188] an inner wall (3a) of the header flow path (3) has a larger surface roughness than a flow path wall (2a) of the plurality of internal flow paths (2).

[0189] According to the method of manufacturing the heat exchange core (1) of the present disclosure, the inner wall (3a) of the header flow path (3) has a larger surface roughness than the flow path wall (2a) of the internal flow path (2), and thus the molding time per unit volume in the step of forming the header flow path (3) can be made shorter than in a portion in which the plurality of internal flow paths (2) are provided. Therefore, the heat exchange core (1) can be shortened in the overall molding time, and thus the manufacturing cost of the heat exchange core (1) can be reduced.

[0190]

[17] A method of manufacturing a heat exchange core (1) according to the above-mentioned

[16] , wherein,

[0191] The inner wall (3a) of the header flow path (3) has:

[0192] a first region (3a1) on one side in the extension direction of the plurality of internal flow paths (2), and

[0193] a second region (3a2) on the other side in the extension direction and including an inclined surface having an angle of 60 degrees or less with respect to the extension direction.

[0194] According to such a manufacturing method, the angle of the inclined surface of the second region (3a2) of the inner wall (3a) of the header flow path (3) with respect to the extension direction of the plurality of internal flow paths (2) is 60 degrees or less, so even in a case where the extension direction of the plurality of internal flow paths (2) is set as the stacking direction in preference to the header flow path (3), the plurality of internal flow paths (2) can be stacked while avoiding the problem of overhang, including the header flow path (3).

[0195]

[18] Another aspect of the manufacturing method of the heat exchange core (1) is the manufacturing method of the heat exchange core (1) according to

[16] or

[17] , in which,

[0196] The layering molding includes:

[0197] the step of spreading the metal powder and the step of imparting energy to the metal powder to melt and solidify the metal powder are repeated as a series of cycles,

[0198] The header flow path (3) is at least partially disposed in the formation range (2A) of the plurality of internal flow paths (2) in the extension direction,

[0199] The portion provided with the header flow path (3) and the portion provided with the plurality of internal flow paths (2) are molded by the series of cycles.

[0200] According to such a manufacturing method, the header flow path (3) is disposed in the formation range (2A) of the plurality of internal flow paths (2) in the extension direction of the plurality of internal flow paths (2), and the portion provided with the header flow path (3) and the portion provided with the plurality of internal flow paths (2) are molded by the series of cycles, so the size of the heat exchange core (1) in the extension direction of the plurality of internal flow paths (2) can be suppressed, the heat exchange core (1) can be compactified, and the molding time of the heat exchange core (1) can be shortened.

[0201]

[19] Another aspect of the manufacturing method of the heat exchange core (1) is the manufacturing method of the heat exchange core (1) according to

[18] , in which,

[0202] In the step of causing the metal powder to be molten and solidified, the frequency of energy imparted to the portion provided with the manifold flow path (3) is less than that of the portion provided with the plurality of internal flow paths (2).

[0203] According to such a manufacturing method, the frequency of energy imparted to the portion provided with the manifold flow path (3) is less than that of the portion provided with the plurality of internal flow paths (2), and thus the molding time per unit area of the portion provided with the manifold flow path (3) can be made shorter than that of the portion provided with the plurality of internal flow paths (2). Therefore, the molding time of the entire heat exchange core (1) can be shortened, and thus the manufacturing cost of the heat exchange core (1) can be reduced.

[0204] Explanation of Reference Numerals

[0205] 1 Heat exchange core

[0206] 11 Main body portion

[0207] 111 Outer wall (bottom wall)

[0208] 112 Outer wall (side wall)

[0209] 116 Outer wall (upper wall)

[0210] 12 Manifold portion

[0211] 121 First manifold portion

[0212] 122 Second manifold portion

[0213] 123 Third manifold portion

[0214] 124 Fourth manifold portion

[0215] 13 Connection pipe

[0216] 131 First connection pipe

[0217] 132 Second connection pipe

[0218] 133 Third connection pipe

[0219] 134 Fourth connection pipe

[0220] 14 Support portion

[0221] 15 Adapter

[0222] 16 Fluid supply pipe

[0223] 17 Fluid discharge pipe

[0224] 2 Internal flow path

[0225] 2A Range of formation of internal flow path

[0226] 2a flow path wall

[0227] 21 first flow path

[0228] 21a flow path wall

[0229] 211 divided flow path

[0230] 22 second flow path

[0231] 22a flow path wall

[0232] 221 divided flow path

[0233] 23 partition wall

[0234] 24 division wall

[0235] 3 header flow path

[0236] 3a inner wall of header flow path

[0237] 3a1 first region

[0238] 3a2 second region

[0239] 3a3 curved surface

[0240] 3a31 center of curvature

[0241] 31 first header flow path

[0242] 31a inner wall

[0243] 32 second header flow path

[0244] 32a inner wall

[0245] 33 third header flow path

[0246] 33a inner wall

[0247] 34 fourth header flow path

[0248] 34a inner wall

[0249] 4 intermediate flow path

[0250] 4A formation range

[0251] 4a partition wall

[0252] 41 first intermediate flow path

[0253] 42 second intermediate flow path

[0254] 42a partition wall

[0255] 5 connection flow path

[0256] 5a inner wall of the connection flow path

[0257] 5a3 third region

[0258] 5a4 fourth region

[0259] 6 heat exchanger

[0260] 7 housing

[0261] 71 fitting concave portion

[0262] 72 flow path

Claims

1. A heat exchange core, wherein the heat exchange core is provided with: a plurality of internal flow paths extending in parallel with each other; a header flow path communicating with the internal flow paths at end portions of the internal flow paths in the extending direction of the plurality of internal flow paths; a main body portion having the plurality of internal flow paths; a header portion having the header flow path at an end portion side of at least one of the main body portions; and an intermediate flow path for communicating the header flow path with the plurality of internal flow paths, the header flow path is located in a header region deviated outward from a configuration region of the plurality of internal flow paths when viewed from above in the extending direction of the plurality of internal flow paths, the main body portion has a main body portion side surface extending in the extending direction of the plurality of internal flow paths at a position closer to the configuration region than a portion in the header region most outward from the configuration region when viewed from above, an outer wall isolating the intermediate flow path from the outside is recessed toward an internal flow path side in the extending direction of the intermediate flow path with respect to the header portion, an inner wall of the header flow path has: a first region on one side in the extending direction of the plurality of internal flow paths; and a second region on the other side in the extending direction of the plurality of internal flow paths and including an inclined surface having an angle of 60 degrees or less with respect to the extending direction of the plurality of internal flow paths, the heat exchange core includes a pair of the header flow paths respectively on both end sides of the plurality of internal flow paths, and the second regions of the pair of the header flow paths are provided on the same side with respect to the first regions.

2. The heat exchange core according to claim 1, wherein the header flow path is at least partially configured within a formation range of the plurality of internal flow paths in the extending direction of the plurality of internal flow paths.

3. The heat exchange core according to claim 1, wherein the first region is formed in a groove shape having a circular arc shape in cross section.

4. The heat exchange core according to claim 1, wherein the header flow path is at least partially located on opposite sides of the plurality of internal flow paths across the intermediate flow path in the extending direction of the plurality of internal flow paths.

5. The heat exchange core according to claim 1, wherein flow path opening shapes are different from each other in the plurality of header flow paths.

6. The heat exchange core according to any one of claims 1 to 3, wherein an inner wall of the header flow path has a surface roughness greater than a flow path wall of the plurality of internal flow paths.

7. The heat exchange core according to claim 6, wherein the plurality of internal flow paths extend in parallel with each other, the inner wall of the header flow path includes: a first region on one side in the extending direction of the plurality of internal flow paths and having a first surface roughness; and a second region on the other side in the extending direction of the plurality of internal flow paths and having a second surface roughness greater than the first surface roughness, the first surface roughness of the inner wall of the header flow path is greater than a surface roughness of the flow path wall of the internal flow paths.

8. The heat exchange core according to claim 6, wherein ​ The partition wall between the header flow path and the intermediate flow path for fluid flow of the other party extends along the extension direction of the plurality of internal flow paths.

9. The heat exchange core according to claim 6, wherein The heat exchange core is provided with the intermediate flow path adjacent to the end portions of the plurality of internal flow paths, The inner wall of the header flow path includes a curved surface having a circular arc shape, and the partition wall between the header flow path and the intermediate flow path for fluid flow of the other party has a portion of the curved surface on the surface, The curvature center of the curved surface is located within the formation range of the intermediate flow path in the extension direction of the plurality of internal flow paths.

10. The heat exchange core according to claim 1, wherein The heat exchange core is provided with a connection pipe that protrudes from the header portion in the extension direction of the header flow path, The connection pipe has a connection flow path that communicates with the header flow path.

11. A heat exchanger, wherein The heat exchanger is provided with: The heat exchange core according to claim 10; and A housing that accommodates the heat exchange core, The housing has: A fitting recess that fits with the connection pipe when the heat exchange core is accommodated therein; and A flow path that communicates with the connection flow path when the connection pipe is fitted in the fitting recess.

12. A method of manufacturing a heat exchange core, The heat exchange core is provided with: A plurality of internal flow paths that extend parallel to each other; A header flow path that communicates with the plurality of internal flow paths; A main body portion that has the plurality of internal flow paths; and a header portion having the header flow path at an end portion side of at least one of the body portions; An intermediate flow path that communicates the header flow path with the plurality of internal flow paths, The header flow path is located outside the arrangement region of the plurality of internal flow paths in a top view when viewed in the extension direction of the plurality of internal flow paths, The main body portion has a main body portion side surface that extends along the extension direction of the plurality of internal flow paths at a position closer to the arrangement region than a portion in the header region that is farthest outside in the arrangement region in the top view, An outer wall that isolates the intermediate flow path from the outside is recessed toward the internal flow path side with respect to the header portion along the extension direction of the intermediate flow path, In which, The method of manufacturing a heat exchange core includes: A step of forming the internal flow paths by layering molding along the extension direction of the plurality of internal flow paths; And A step of forming the header flow path by layering molding along the extension direction of the plurality of internal flow paths, The inner wall of the header flow path has a surface roughness greater than the flow path wall of the internal flow paths, And the inner wall of the header flow path has: A first region on one side in the extension direction of the plurality of internal flow paths; and A second region on the other side in the extension direction of the plurality of internal flow paths and including an inclined surface having an angle of 60 degrees or less with respect to the extension direction of the plurality of internal flow paths, The heat exchange core includes a pair of header flow paths respectively on both end sides of the plurality of internal flow paths, and the second region of the pair of header flow paths is disposed on the same side with respect to the first region.

13. The method of manufacturing a heat exchange core according to claim 12, wherein ​ The layering molding includes: The step of spreading the metal powder and the step of imparting energy to the metal powder to melt and solidify the metal powder are repeated as a series of cycles, The manifold flow path is at least partially disposed in a range of formation of the plurality of internal flow paths in an extension direction of the plurality of internal flow paths, The portion provided with the manifold flow path and the portion provided with the plurality of internal flow paths are molded by the series of cycles.

14. The method of manufacturing a heat exchange core according to claim 13, wherein In the step of melting and solidifying the metal powder, the portion provided with the manifold flow path is imparted with energy at a lower frequency than the portion provided with the plurality of internal flow paths.

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