Heat exchange core

Abstract

The heat exchange core has a first flow path and a second flow path extending along the first flow path. At least one of the first flow path and the second flow path includes a plurality of throttle portions with extremely small areas of flow path cross-sections orthogonal to the flow path extension direction and a plurality of expansion portions with extremely large areas. Each of the plurality of throttle portions and each of the plurality of expansion portions are alternately arranged in the flow path extension direction.

Description

Technical Field

[0001] The present disclosure relates to a heat exchange core.

[0002] This application claims priority based on Japanese Patent Application No. 2020-031581 filed with the Japan Patent Office on February 27, 2020, and incorporates its content herein. Background Art

[0003] Patent Document 1 discloses a heat exchanger formed by laminating a layer having a plurality of first narrow flow paths through which a fluid to be heated flows and a layer having a plurality of second narrow flow paths through which a heating fluid flows.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-007657 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, in the heat exchanger (heat exchange core) disclosed in the above Patent Document 1, due to the growth of the temperature boundary layer in the flow path, the heat transfer coefficient decreases on the downstream side of the flow path, and there are cases where it is difficult to perform heat exchange efficiently. In particular, in the case of a flow path with a large aspect ratio (a flow path in which the flow path length is much longer than the flow path width (height)), the temperature boundary layer expands over a considerable part of the downstream flow path cross section.

[0009] At least one embodiment of the present disclosure has been completed in view of the above circumstances, and an object thereof is to provide a heat exchange core capable of efficiently performing heat exchange.

[0010] Means for Solving the Problems

[0011] To achieve the above object, the heat exchange core of the present invention includes:

[0012] a first flow path; and

[0013] a second flow path extending along the first flow path,

[0014] at least one of the first flow path and the second flow path includes a plurality of throttle portions having a very small area of the flow path cross section orthogonal to the flow path extension direction, and a plurality of enlargement portions having a very large area,

[0015] the plurality of throttle portions and the plurality of enlargement portions are alternately arranged in the flow path extension direction.

[0016] Effects of the Invention

[0017] According to the heat exchange core of the present disclosure, by alternately arranging each of a plurality of throttling portions and each of a plurality of expanding portions, the development of the temperature boundary layer can be hindered, or the temperature boundary layer can be destroyed by the throttling portion, thereby increasing the heat transfer coefficient. Thus, according to the heat exchange core of the present disclosure, heat exchange can be efficiently performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of the heat exchange core of Embodiment 1.

[0019] Figure 2 is Figure 1 a sectional view taken along line II-II of the heat exchange core shown.

[0020] Figure 3 is a sectional view showing a first flow path and a second flow path of an embodiment.

[0021] Figure 4 is a sectional view showing a first flow path and a second flow path of an embodiment.

[0022] Figure 5 is a sectional view showing a first flow path and a second flow path of an embodiment.

[0023] Figure 6 is a perspective view showing a first flow path and a second flow path of an embodiment.

[0024] Figure 7 is a sectional view showing a first flow path and a second flow path of an embodiment.

[0025] Figure 8 is a perspective view showing a first flow path and a second flow path of an embodiment.

[0026] Figure 9 is Figure 8 a sectional view taken along line IX-IX of the first flow path and the second flow path shown.

[0027] Figure 10 is showing Figure 8 a perspective view of the rib shown.

[0028] Figure 11 is Figure 10 a sectional view taken along line XI-XI of the rib shown.

[0029] Figure 12 is Figure 11 a sectional view taken along line XII-XII of the rib shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Hereinafter, the heat exchange core of the embodiment of the present disclosure will be described based on the drawings. This embodiment represents one mode of the present disclosure and does not limit the present disclosure, and can be arbitrarily changed within the scope of the technical idea of the present disclosure.

[0031] [Schematic Structure of Heat Exchange Core]

[0032] As shown in Figure 1 and Figure 2 , the heat exchange core 1 of the embodiment of the present disclosure is the main structure of a heat exchanger that exchanges heat between a high-temperature fluid and a low-temperature fluid, and is provided with flow paths 10 through which the high-temperature fluid and the low-temperature fluid respectively flow. The high-temperature fluid and the low-temperature fluid can each be either a liquid or a gas, but usually their temperatures are different. In addition, although not limited, the heat exchange core 1 can be set in a rectangular parallelepiped shape.

[0033] As shown in Figure 2 , the heat exchange core 1 includes a first flow path and a second flow path extending along the first flow path. As shown in Figure 1 and Figure 2 , in the rectangular parallelepiped-shaped heat exchange core 1, a plurality of flow paths 10 arranged in a lattice pattern are provided so as to extend along the length direction of the heat exchange core 1, and they constitute the first flow path and the second flow path. For example, if one of a pair of adjacent flow paths 10, 10 in the width direction (the X direction in Figure 2 ) of the heat exchange core 1 constitutes the first flow path, then the other constitutes the second flow path. In addition, for example, if one of a pair of adjacent flow paths 10, 10 in the depth direction (the Y direction in Figure 2 ) of the heat exchange core 1 constitutes the first flow path, then the other constitutes the second flow path.

[0034] The plurality of flow paths 10 have a rectangular cross-section with the width direction of the heat exchange core 1 being larger than the depth direction. And, in the flow paths 10 adjacent in the width direction of the heat exchange core 1, either the high-temperature fluid or the low-temperature fluid flows, and in the flow paths 10 adjacent in the depth direction, the high-temperature fluid and the low-temperature fluid flow alternately. Therefore, in the flow paths 10, 10 adjacent in the width direction of the heat exchange core 1, the same fluid flows in the same direction, but in the flow paths 10, 10 adjacent in the depth direction, the high-temperature fluid and the low-temperature fluid can flow in the same direction (parallel flow) or in opposite directions (countercurrent flow).

[0035] [Structure of Flow Path]

[0036] As shown in Figures 3 to 8As shown, in the heat exchange core 1 of several embodiments, at least one of the first flow path and the second flow path includes a plurality of throttle portions 13 with extremely small cross-sectional areas of the flow path perpendicular to the flow path extension direction, and a plurality of expansion portions 14 with extremely large cross-sectional areas of the flow path. Moreover, the plurality of throttle portions 13 and the plurality of expansion portions 14 are alternately arranged in the flow path extension direction.

[0037] The plurality of throttle portions 13 and the plurality of expansion portions 14 may be constituted by a flow path 10 with a variable flow path width as shown in Figure 3 , or may be constituted by protrusions 33 protruding into the flow path 10 as shown in Figure 4 . Additionally, as shown in Figures 5 to 8 , they may also be constituted by ribs 34 connecting the opposing walls 17, 17 of the flow path 10.

[0038] According to the heat exchange core 1 of the above several embodiments, by alternately arranging the plurality of throttle portions 13 and the plurality of expansion portions 14, the development of the temperature boundary layer can be hindered, or the temperature boundary layer can be destroyed by the throttle portions 13, thereby increasing the heat transfer coefficient. Thus, the heat exchange core 1 of several embodiments can efficiently perform heat exchange.

[0039] As shown in Figures 3 to 8 , the heat exchange core 1 of several embodiments includes a partition wall 15 provided between the first flow path and the second flow path and separating the first flow path 11 from the second flow path. Moreover, each of the above throttle portions 13 and each of the expansion portions 14 have a shape that varies the flow path width perpendicular to the partition wall 15 in the flow path extension direction.

[0040] In Figures 4 to 8 the shown heat exchange core 1, one of a pair of adjacent flow paths 10, 10 in the depth direction of the heat exchange core 1 constitutes the first flow path, and the other constitutes the second flow path. Moreover, the first flow path and the second flow path are separated by a partition wall 15 provided between the first flow path and the second flow path. And in Figure 4 the shown heat exchange core 1, the protrusions 33 protruding into the flow path 10 vary the flow path width perpendicular to the flow path 10, and in Figure 5 and Figure 6 the shown heat exchange core 1, the ribs 34 connecting the opposing walls 17, 17 of the flow path 10 vary the flow path width perpendicular to the flow path 10.

[0041] Additionally, in Figure 7 and Figure 8 the shown heat exchange core 1, one of a pair of adjacent flow paths 10, 10 in the width direction of the heat exchange core 1 constitutes the first flow path, and the other constitutes the second flow path. Moreover, the first flow path and the second flow path are separated by a partition wall 15 provided between the first flow path and the second flow path. And in Figure 7 andFigure 8 In the heat exchange core 1 shown, the ribs 34 connecting the opposing walls 17, 17 of the flow paths change the flow path width orthogonal to the flow path 10.

[0042] In the heat exchange core 1 according to the above several embodiments, each throttle portion 13 and each expansion portion 14 have a shape that changes the flow path width orthogonal to the partition wall 15 in the extending direction of the flow path 10, and thus can break the temperature boundary layer near the partition wall that hinders heat exchange.

[0043] As Figures 4 to 8 shown, the heat exchange core 1 of several embodiments includes obstacles 32 respectively provided along the partition wall 15 at a plurality of positions in the extending direction of the flow path inside at least one of the first flow path and the second flow path. Moreover, each obstacle 32 is provided between the partition wall 15 and the flow path wall 16 opposing the partition wall 15, and at least one set of throttle portions 13, 13 and expansion portions 14, 14 are formed on both sides of the obstacle 32.

[0044] If the obstacles 32 are respectively provided along the partition wall 15 at a plurality of positions in the extending direction of the flow path inside at least one of the first flow path and the second flow path, it also includes a structure supported by a pillar extending from the partition wall 15 and seemingly floating from the partition wall 15. In addition, the obstacle 32 may be a protrusion 33 protruding into the flow path 10 as Figure 4 shown, or may be a rib 34 connecting the opposing walls 17, 17 of the flow path 10 as Figures 5 to 8 shown. Therefore, as long as the obstacle 32 is a structure provided at a position separated from the partition wall at the center in the flow path width direction, it may include various structures.

[0045] In the heat exchange core 1 according to the above several embodiments, the temperature boundary layers on both sides of the obstacle 32 can be broken.

[0046] As Figure 7 shown, in the heat exchange core 1 of one embodiment, one of a pair of adjacent flow paths 10 in the depth direction of the heat exchange core 1 constitutes a first flow path, and the other constitutes a second flow path. Moreover, the first flow path and the second flow path are separated by a partition wall 15 provided between the first flow path and the second flow path. And, a rib 34 connecting the partition wall 15 and the flow path wall 16 opposing the partition wall 15 is provided. The cross section (longitudinal section) of the rib 34 in the flow path extending direction is a line-symmetric streamline shape.

[0047] In the heat exchange core 1 according to the above one embodiment, the temperature boundary layers on both sides of the rib 34 can be broken. In addition, by making the cross section of the rib 34 in the flow path extending direction be a streamline shape, the flow path resistance can be suppressed, and in addition, the generation of stagnant regions can be suppressed. In addition, the entire surface of the streamline-shaped rib 34 can be used as a heat transfer surface, and thus heat transfer can be promoted.

[0048] As Figure 3 and Figure 4 shown, in the heat exchange core 1 of several embodiments, at least one of the first flow path and the second flow path has irregularities 36, 37 on the partition wall 15 when observed in the flow path extension direction.

[0049] In Figure 3 and Figure 4 the heat exchange core 1 shown, one of a pair of adjacent flow paths 10, 10 in the depth direction of the heat exchange core 1 constitutes the first flow path, and the other constitutes the second flow path. Moreover, the first flow path 11 and the second flow path are separated by the partition wall 15 provided between the first flow path and the second flow path. Moreover, in Figure 3 the heat exchange core 1 shown, when observed in the flow path extension direction, the partition wall 15 has irregularities 36, 37. On the other hand, in Figure 4 the heat exchange core 1 shown, the protrusions 33 provided on the partition wall 15 and protruding into the flow path 10 constitute the irregularities 36, 37.

[0050] According to the heat exchange core 1 of the above several embodiments, at least one of the first flow path and the second flow path has irregularities 36, 37 on the partition wall 15 when observed in the extension direction of the flow path 10, so that the temperature boundary layer near the partition wall that hinders heat exchange can be broken.

[0051] As Figure 5 , Figure 6 and Figure 8 shown, in several embodiments, at least one of the first flow path and the second flow path includes ribs 34 that connect the opposing walls of the flow path 10 to each other along the minimum flow path width passing through the centroid of the flow path cross section. And the throttle portion 13 and the expansion portion 14 are formed by the ribs 34.

[0052] Figure 5 The ribs 34 shown are trapezoidal in shape when observed from a direction orthogonal to the flow path extension direction, and a set of throttle portions 13 and expansion portions 14 are formed on both sides of the ribs 34. In addition, Figure 6 the ribs 34 shown are rectangular in shape when observed from a direction orthogonal to the flow path extension direction, and a set of throttle portions 13 and expansion portions 14 are formed on both sides of the ribs 34.

[0053] According to the heat exchange core 1 of the above embodiment, not only can the temperature boundary layer be broken, but also the flow path structure can be strengthened by the ribs 34. For example, damage caused by the differential pressure of the flow path partition wall, thermal stress acting on the heat exchange core 1, etc. can be prevented.

[0054] As Figure 5 shown, in the heat exchange core 1 of an embodiment, the ribs 34 include inclined surfaces with an angle θ with respect to the flow path extension direction of 60 degrees or less and preferably 45 degrees or less. Figure 5The rib 34 shown includes inclined surfaces on both sides in the flow path extending direction, with an angle θ with respect to the flow path extending direction of 60 degrees or less, preferably 45 degrees or less. Thus, Figure 5 the rib 34 shown has a trapezoidal shape when viewed from a direction orthogonal to the flow path extending direction.

[0055] In the heat exchange core 1 according to the above-described embodiment, since the rib 34 includes inclined surfaces with an angle θ with respect to the flow path extending direction of 60 degrees, preferably 45 degrees or less, even when the heat exchange core 1 is shaped by laminated molding and the shaping in the flow path extending direction is prioritized, it is possible to avoid problems such as deformation of the overhanging shape with a surface facing downward in the lamination direction resulting in poor shaping, warping of the shaped product due to residual stress generated during shaping, and reduction in accuracy (hereinafter referred to as "overhanging problems"), and perform laminated molding including the rib 34.

[0056] As Figure 8 and Figure 9 shown, in the heat exchange core 1 of one embodiment, the rib 34 has a cross-sectional shape along the extending direction of the rib 34 in the extending direction of the flow path 10, where the length of the rib 34 in the extending direction of the flow path decreases as it moves away from the opposing walls 17, 17.

[0057] In the heat exchange core 1 according to the above embodiment, compared with a rib having a constant rib length in the flow path extending direction and a cross-sectional shape along the extending direction of the rib, it is possible to reduce the flow path resistance and the pressure loss.

[0058] As Figure 10 shown, in the heat exchange core 1 of one embodiment, the rib 34 has a constricted portion 341 located between the opposing walls 17, 17 and having the smallest length of the rib 34 in the extending direction of the flow path 10.

[0059] In the heat exchange core 1 according to the above-described embodiment, since the flow path resistance becomes smaller toward the constricted portion 341, it is possible to reduce the pressure loss in the rib 34 compared to a rib without a constricted portion.

[0060] As Figure 11 shown, in the heat exchange core 1 of one embodiment, the cross-section of the rib 34 along the opposing wall of the constricted portion 341 tapers toward the end of the rib 34 in the flow path extending direction.

[0061] In the heat exchange core 1 according to the above embodiment, it is possible to stabilize the flow of the fluid flowing in the flow path 10 and branching at the end of the rib 34 in the flow path extending direction.

[0062] As Figure 11As shown, in the heat exchange core 1 of one embodiment, at the opposing walls 17, 17 and the constricted portion 341, the rib 34 tapers towards the end in the flow path extending direction of the rib 34, and the end in the flow path extending direction of the rib 34 at the opposing walls 17, 17 and the constricted portion 341 is pointed, but it may have rounded corners at least at the ends in the flow path extending direction of the opposing walls 17, 17.

[0063] In the heat exchange core 1 according to the above embodiment, the rib 34 has rounded corners at least at the ends in the flow path extending direction of the opposing walls 17, 17, so that the pressure loss of the fluid flowing in the flow path 10 can be reduced.

[0064] As Figure 10 shown, in the heat exchange core 1 of one embodiment, the rib 34 includes a pair of side walls 342, 342, a pair of first tapered surfaces 343, 343, and a pair of second tapered surfaces 344, 344. The pair of side walls 342, 342 connect the opposing walls 17, 17 to each other along a plane including the direction in which the flow path 10 extends and the direction orthogonal to the opposing walls. The pair of first tapered surfaces 343, 343 are respectively connected to the pair of side walls 342, 342 at the ends of the rib 34 in the extending direction of the flow path 10, defining the shape in which the front end of the rib 34 tapers. The pair of second tapered surfaces 344, 344 are respectively connected to the pair of first tapered surfaces 343, 343 and project from the first tapered surfaces 343 in the extending direction of the flow path 10 and the direction orthogonal to the extending direction of the flow path 10.

[0065] In the heat exchange core 1 of the above embodiment, the fluid flowing in the flow path 10 branches until it reaches the constricted portion 341 under the action of the ridge line dividing the pair of second tapered surfaces 344, 344. Moreover, the branched fluid flows along the second tapered surfaces 344, the first tapered surfaces 343, and the side walls 342 in this order.

[0066] In the heat exchange core 1 according to the above embodiment, the fluid flowing in the flow path 10 branches until it reaches the constricted portion 341 under the action of the ridge line dividing the pair of second tapered surfaces, so that the flow of the branched fluid can be stabilized. In addition, the branched fluid flows along the second tapered surfaces 344, the first tapered surfaces 343, and the side walls 342 in this order, so that the flow of the branched fluid can also be stabilized.

[0067] In addition, as Figure 10 shown, in the heat exchange core 1 of one embodiment, each of the first tapered surfaces 343 and each of the second tapered surfaces 344 are formed by a plane.

[0068] According to the heat exchange core 1 of the above-described embodiment, the boundary between the first conical surface 343 and the second conical surface 344 is divided by a ridge line. Therefore, the boundary between the first conical surface 343 and the second conical surface 344 becomes clear, and the flow of the fluid can be stabilized. In addition, by setting each of the first conical surfaces 343 and each of the second conical surfaces 344 as a flat surface, the manufacturing data in the case of forming the heat exchange core 1 by layered modeling can be made less than the manufacturing data in the case of setting each of the first conical surfaces 343 and each of the second conical surfaces 344 as streamline-shaped (curved surfaces). As a result, the modeling of the heat exchange core 1 becomes easy, and the manufacturing cost can also be reduced.

[0069] In addition, as Figure 12 shown, in the heat exchange core 1 of an embodiment, in a cross section of the rib 34 along the opposed wall 17, the front end angle θ of the rib 34 formed between a pair of second conical surfaces 343, 343 is 120 degrees or less, preferably 90 degrees or less.

[0070] According to the heat exchange core 1 of the above-described embodiment, in a cross section of the rib 34 along the opposed wall 17, the front end angle θ of the rib 34 formed between a pair of second conical surfaces 343, 343 is 120 degrees or less. Therefore, even when the opposed wall 17 is preferentially modeled when the heat exchange core 1 is modeled by layered modeling, it is possible to perform layered modeling including the rib 34 while avoiding the problem of overhang.

[0071] In addition, as Figure 10 shown, in the heat exchange core 1 of an embodiment, the first conical surfaces 343, 343 extend along a plane including the orthogonal direction of the opposed walls 17, 17.

[0072] According to the heat exchange core 1 of the above-described embodiment, the fluid flowing in the flow path 10 flows equally with respect to the opposed walls 17, 17. Therefore, the flow of the fluid can be stabilized.

[0073] The present invention is not limited to the above-described embodiments, and also includes modified forms of the above-described embodiments and forms obtained by appropriately combining these forms.

[0074] The contents described in the above embodiments can be grasped as follows, for example.

[0075] (1) The heat exchange core 1 of one aspect includes:

[0076] A first flow path; and

[0077] A second flow path that extends along the first flow path,

[0078] At least one of the first flow path and the second flow path includes a plurality of throttling portions 13 having a very small area of the flow path cross section orthogonal to the flow path extension direction and a plurality of enlarging portions 14 having a very large area,

[0079] Each of the plurality of throttle portions 13 and each of the plurality of expansion portions 14 are alternately arranged in the flow path extending direction.

[0080] According to the heat exchange core 1 of the present disclosure, by alternately arranging each of the plurality of throttle portions 13 and each of the plurality of expansion portions 14, the development of the temperature boundary layer can be hindered, or the temperature boundary layer can be destroyed by the throttle portions 13, thereby improving the heat transfer coefficient. Thus, the heat exchange core 1 of the present disclosure can perform heat exchange efficiently.

[0081] (2) The heat exchange core 1 of another embodiment is based on the heat exchange core 1 described in (1), wherein,

[0082] The heat exchange core 1 includes a partition wall (15) that is provided between the first flow path and the second flow path and separates the first flow path and the second flow path.

[0083] Each of the throttle portions 13 and each of the expansion portions 14 has a shape that changes the flow path width orthogonal to the partition wall 15 in the flow path extending direction.

[0084] According to such a structure, each of the throttle portions 13 and each of the expansion portions 14 has a shape that changes the flow path width orthogonal to the partition wall 15 in the flow path extending direction, so that the temperature boundary layer near the partition wall that hinders heat exchange can be destroyed.

[0085] (3) The heat exchange core 1 of still another embodiment is based on the heat exchange core 1 described in (2), wherein,

[0086] The heat exchange core 1 includes obstacles 32 that are respectively provided along the partition wall at a plurality of positions in the flow path extending direction inside at least one of the first flow path and the second flow path.

[0087] Each of the obstacles 32 is provided between the partition wall 15 and the flow path wall opposite to the partition wall 15, and at least one set of the throttle portions 13 and the expansion portions 14 is formed on both sides of the obstacle 32.

[0088] According to such a structure, the temperature boundary layers on both sides of the obstacle 32 can be destroyed.

[0089] (4) The heat exchange core 1 of still another embodiment is based on the heat exchange core 1 described in (2), wherein,

[0090] When observing at least one of the first flow path and the second flow path in the flow path extending direction, the partition wall 15 has irregularities 36, 37.

[0091] According to such a structure, when observing at least one of the first flow path and the second flow path in the flow path extension direction, the partition wall 15 has unevenness 36 and 37, so that the temperature boundary layer near the partition wall 15 that hinders heat exchange can be broken.

[0092] (5) Another heat exchange core 1 is based on the heat exchange core 1 described in any one of (1) to (3), wherein

[0093] At least one of the first flow path and the second flow path includes ribs 34 that connect the opposing walls 17, 17 of the flow path to each other along the direction of the minimum flow path width passing through the centroid of the flow path cross-section.

[0094] The throttling portion 13 and the expanding portion 14 are formed by the ribs 34.

[0095] According to such a structure, not only can the temperature boundary layer be broken, but the flow path structure can also be strengthened by the ribs 34. For example, damage caused by the differential pressure of the partition wall 15, thermal stress acting on the heat exchange core 1, etc. can be prevented.

[0096] (6) Another heat exchange core 1 is based on the heat exchange core described in (5), and the rib includes an inclined surface with an angle θ of 60 degrees or less with respect to the flow path extension direction.

[0097] According to such a structure, the rib includes an inclined surface with an angle θ of 60 degrees or less with respect to the flow path extension direction. Therefore, even when the heat exchange core 1 is shaped by laminated molding and the flow path extension direction is preferentially shaped, it is possible to perform laminated molding including the ribs 34 while avoiding the problem of overhang.

[0098] (7) Another heat exchange core 1 is based on the heat exchange core 1 described in (5), wherein

[0099] The rib 34 has a cross-sectional shape along the extension direction of the rib 34 in which the rib length in the flow path extension direction decreases as it moves away from the opposing walls 17, 17.

[0100] According to such a structure, compared with a rib having a constant rib length in the flow path extension direction and a cross-sectional shape along the extension direction of the rib, the flow path resistance can be reduced and the pressure loss can be reduced.

[0101] (8) Another heat exchange core 1 is based on the heat exchange core 1 described in (5) or (7), wherein

[0102] The rib 34 has a necking portion 341 located between the opposing walls 17, 17 and having the minimum rib length.

[0103] According to this structure, since the flow path resistance becomes smaller towards the constricted portion 341, the pressure loss at the rib 34 can be reduced compared to a rib without a constricted portion.

[0104] (9) A heat exchange core 1 of another embodiment is based on the heat exchange core 1 described in (8), wherein

[0105] The cross-section of the rib 34 along the opposed wall at the constricted portion 341 tapers towards the end of the rib 34.

[0106] According to such a structure, the flow of the fluid flowing in the flow path 10 and branching at the end of the rib 34 can be stabilized.

[0107] (10) A heat exchange core 1 of another embodiment is based on the heat exchange core described in (8) or (9), wherein

[0108] The rib has a rounded corner at least at the end portion at the opposed wall.

[0109] According to such a structure, the pressure loss of the fluid flowing in the flow path 10 can be reduced.

[0110] (11) A heat exchange core 1 of another embodiment is based on the heat exchange core 1 described in any one of (5) to (10), wherein

[0111] The rib 34 includes:

[0112] A pair of side walls 342, 342 that connect the opposed walls 17, 17 to each other along a plane including the flow path extension direction and the orthogonal direction of the opposed walls 17, 17;

[0113] A pair of first tapered surfaces 343, 343 that are respectively connected to the pair of side walls 342, 342 at the ends of the rib 34 in the flow path extension direction and define the shape in which the front end of the rib 34 tapers; and

[0114] A pair of second tapered surfaces 344, 344 that are respectively connected to the pair of first tapered surfaces 343, 343 and project from the first tapered surfaces 343, 343 in the flow path extension direction and the direction orthogonal to the flow path extension direction.

[0115] According to such a structure, the fluid flowing in the flow path 10 branches until it reaches the constricted portion 341 under the action of the ridge line dividing the pair of second tapered surfaces 344, 344, so that the flow of the branched fluid can be stabilized. In addition, the branched fluid flows along the second tapered surface 344, the first tapered surface 343, and the side wall 342 in this order, so that the branched flow can also be stabilized.

[0116] (12) In the heat exchange core 1 of another solution, based on the heat exchange core 1 described in (11), wherein,

[0117] Each of the first conical surfaces 343, 343 and each of the second conical surfaces 344, 344 are formed by planes.

[0118] According to such a structure, the boundary between the first conical surface 343 and the second conical surface 344 is divided by a ridge line, so the boundary between the first conical surface 343 and the second conical surface 344 becomes clear, and the flow of the fluid can be stabilized. In addition, by providing each first conical surface 343 and each second conical surface, the manufacturing data in the case of forming the heat exchange core 1 by laminated molding can be less than that in the case of setting each first conical surface 343 and each second conical surface as streamline shapes (curved surfaces). Thus, the molding of the heat exchange core 1 becomes easy, and the manufacturing cost can also be reduced.

[0119] (13) In the heat exchange core 1 of another solution, based on the heat exchange core 1 described in (11) or (12), wherein,

[0120] In the cross-section of the rib 34 along the opposed wall, the front end angle θ of the rib formed between the pair of second conical surfaces 344, 344 is 120 degrees or less.

[0121] According to such a structure, in the cross-section of the rib 34 along the opposed wall 17, the front end angle θ of the rib 34 formed between the pair of second conical surfaces 343, 343 is 120 degrees or less. Therefore, even when the opposed wall 17 is preferentially formed during the lamination molding of the heat exchange core 1, the lamination molding including the rib 34 can be performed while avoiding the problem of overhang.

[0122] (14) In the heat exchange core 1 of another solution, based on the heat exchange core 1 described in any one of (11) to (13), wherein,

[0123] The first conical surface 343 extends along a plane including the orthogonal direction of the opposed wall.

[0124] According to such a structure, the fluid flowing in the flow path 10 flows equally with respect to the opposed walls 17, 17, so the flow of the fluid can be stabilized.

[0125] Description of Reference Numerals

[0126] 1 Heat exchange core

[0127] 10 Flow path

[0128] 13 Throttle portion

[0129] 14 Enlargement portion

[0130] 15 Partition wall

[0131] 16 Flow path wall

[0132] 17 Opposing wall

[0133] 32 Obstacle

[0134] 33 Protrusion

[0135] 34 Rib

[0136] 341 Necking portion

[0137] 342 Side wall

[0138] 343 First conical surface

[0139] 344 Second conical surface

[0140] 36 Concavity

[0141] 37 Convexity.

Claims

1. A heat exchange core, wherein, the heat exchange core includes: a first flow path; and a second flow path extending along the first flow path, at least one of the first flow path and the second flow path includes a plurality of throttling portions with extremely small cross-sectional areas of the flow path cross-section orthogonal to the flow path extension direction, a plurality of enlargement portions with extremely large cross-sectional areas, and ribs connecting the opposing walls of the flow path in the direction along the minimum flow path width passing through the centroid of the flow path cross-section, each of the plurality of throttling portions and each of the plurality of enlargement portions are alternately arranged in the flow path extension direction, the throttling portions and the enlargement portions are formed by the ribs, the ribs include: a pair of side walls connecting the opposing walls to each other along a plane including the flow path extension direction and the orthogonal direction of the opposing walls; a pair of first conical surfaces respectively connected to the pair of side walls at the end portions of the ribs in the flow path extension direction, defining a shape with a tapered front end of the rib; and a pair of second conical surfaces respectively connected to the pair of first conical surfaces and protruding from the first conical surfaces in the flow path extension direction and the direction orthogonal to the flow path extension direction.

2. The heat exchange core according to claim 1, wherein, the heat exchange core includes a partition wall provided between the first flow path and the second flow path and separating the first flow path and the second flow path, each of the throttling portions and each of the enlargement portions has a shape that changes the flow path width orthogonal to the partition wall in the flow path extension direction.

3. The heat exchange core according to claim 2, wherein, the heat exchange core includes obstacles respectively provided along the partition wall at a plurality of positions in the flow path extension direction inside at least one of the first flow path and the second flow path, each of the obstacles is provided between the partition wall and the flow path wall opposing the partition wall, and at least one set of the throttling portions and the enlargement portions is formed on both sides of the obstacle.

4. The heat exchange core according to claim 2, wherein, the partition wall has concavities and convexities when observed in the flow path extension direction in at least one of the first flow path and the second flow path.

5. The heat exchange core according to any one of claims 1 to 4, wherein, the ribs include inclined surfaces with an angle of 60 degrees or less with respect to the flow path extension direction.

6. The heat exchange core according to any one of claims 1 to 4, wherein, the ribs have a cross-sectional shape along the extension direction of the ribs in which the rib length in the flow path extension direction decreases as it moves away from the opposing wall.

7. The heat exchange core according to any one of claims 1 to 4, wherein, the ribs have a constricted portion located between the opposing walls and having the minimum rib length.

8. The heat exchange core according to claim 7, wherein, the cross-section of the rib along the opposing wall at the constricted portion tapers towards the end of the rib.

9. The heat exchange core according to any one of claims 1 to 4, wherein, the ribs have rounded corners at least at the end portions at the opposing walls.

10. The heat exchange core according to any one of claims 1 to 4, wherein, Each of the first conical surfaces and each of the second conical surfaces are formed by planes respectively.

11. The heat exchange core according to any one of claims 1 to 4, wherein In a cross-section of the rib along the opposed wall, a front end angle of the rib formed between the pair of second conical surfaces is 120 degrees or less.

12. The heat exchange core according to any one of claims 1 to 4, wherein The first conical surface extends along a plane including the orthogonal direction of the opposed wall.

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