Heat exchange tube and heat exchanger

Abstract

To provide a heat exchange tube improved in heat exchange efficiency.SOLUTION: A heat exchange tube 12 includes: a flat tube stack 23 in which a low pressure porous flat tube 20 with a plurality of low pressure flow paths 20A for flowing of low pressure fluid arrayed along one direction, and a high pressure porous flat tube 18 with a plurality of high pressure flow paths 18A for flowing of high pressure fluid arrayed along the one direction are alternately stacked in a tube thickness direction, which is a direction crossing the one direction, wherein a lateral surface of the low pressure porous flat tube 20 and a lateral surface of the high pressure porous flat tube 18 are in tight contact with each other; and an exterior tube 22 into which the flat tube stack 23 is inserted, and which is provided so as to be contact with an outer peripheral part of the flat tube stack 23.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a heat exchange tube and a heat exchanger.

Background Art

[0002] As heat exchangers, for example, the heat exchangers described in Patent Document 1 and Patent Document 2 are known. The heat exchanger described in Patent Document 1 uses a porous flat tube in which a large number of fluid passage holes are arranged in a plurality of rows in the cross-sectional thickness direction, and the fluid passage hole row on one side is used as a low-pressure fluid passage, and the fluid passage hole row on the other side is used as a high-pressure fluid passage to perform heat exchange between the low-pressure fluid and the high-pressure fluid. In addition, the heat exchanger described in Patent Document 2 discloses a configuration in which a flat low-pressure tube through which a low-pressure medium flows and a flat high-pressure tube through which a high-pressure refrigerant flows are laminated, or a configuration in which a flat low-pressure tube and a flat high-pressure tube are integrated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in any heat exchanger, there is room for improvement in heat exchange efficiency. An object of the present disclosure is to provide a heat exchange tube and a heat exchanger with improved heat exchange efficiency.

Means for Solving the Problems

[0005] The heat exchange tube according to the first aspect includes a low-pressure porous flat tube in which a plurality of low-pressure flow paths through which a low-pressure fluid flows are arranged along one direction, and a high-pressure porous flat tube in which a plurality of high-pressure flow paths through which a high-pressure fluid flows are arranged along one direction. The low-pressure porous flat tube and the high-pressure porous flat tube are alternately laminated in the tube thickness direction, which is a direction intersecting the one direction, and a flat tube laminate in which the side surfaces of the low-pressure porous flat tube and the high-pressure porous flat tube are in close contact with each other, and an exterior tube into which the flat tube laminate is inserted and provided so as to contact the outer peripheral portion of the flat tube laminate.

[0006] In the heat exchange tube according to the first aspect, as an example, by allowing a low-pressure fluid to flow in from the end of the low-pressure flow path on one end side of the low-pressure flat tube and allowing a high-pressure fluid to flow in from the end of the high-pressure flow path on the other end side of the high-pressure flat tube, heat exchange can be performed between the high-pressure fluid and the low-pressure fluid. Note that by allowing a low-pressure fluid to flow in from the end of the low-pressure flow path on one end side of the low-pressure flat tube, the fluid that has completed heat exchange is discharged from the end of the low-pressure flow path on the other end side of the low-pressure flat tube. Also, by allowing a high-pressure fluid to flow in from the end of the high-pressure flow path on the other end side of the high-pressure flat tube, the fluid that has completed heat exchange is discharged from the end of the high-pressure flow path on the one end side of the high-pressure flat tube.

[0007] In the heat exchange tube according to the first aspect, since the high-pressure heat exchange flat tube and the low-pressure heat exchange flat tube are alternately laminated in the thickness direction and the side surfaces are in close contact with each other, the high-pressure heat exchange flat tube and the low-pressure heat exchange flat tube can perform heat exchange of the fluid at the side surface portion.

[0008] Furthermore, in this heat exchange tube, since the width direction ends of the high-pressure heat exchange flat tube, the width direction ends of the low-pressure heat exchange flat tube, the side surfaces of the outermost high-pressure heat exchange flat tube in the lamination direction, and the side surfaces of the outermost low-pressure heat exchange flat tube in the lamination direction are in contact with the inner surface of the exterior tube, respectively, the high-pressure heat exchange flat tube and the low-pressure heat exchange flat tube can also perform heat exchange through the exterior tube.

[0009] As described above, in the heat exchange tube according to the first aspect, the high-pressure heat exchange flat tube and the low-pressure heat exchange flat tube perform heat exchange not only at the portion where the side surface of the high-pressure heat exchange flat tube and the side surface of the low-pressure heat exchange flat tube are in close contact, in other words, in the directly contacting portion, but also through the outer tube. Therefore, the heat exchanger according to the first aspect can improve the heat exchange efficiency as compared with the conventional heat exchange tube in which the outer tube is absent and the high-pressure heat exchange flat tube and the low-pressure heat exchange flat tube are in contact only with the side surfaces.

[0010] Note that it is not limited to flowing in a low-pressure fluid from the end of the low-pressure flow path on one end side of the low-pressure flat tube and flowing in a high-pressure fluid from the end of the high-pressure flow path end on the other end side of the high-pressure flat tube. For example, a low-pressure fluid may be flowed in from the end of the low-pressure flow path on one end side of the low-pressure flat tube, and a high-pressure fluid may be flowed in from the end of the high-pressure flow path end on one end side of the high-pressure flat tube to perform heat exchange between the high-pressure fluid and the low-pressure fluid.

[0011] The heat exchanger according to the second aspect includes the two heat exchange tubes according to the first aspect, a first low-pressure flow port communicating with the low-pressure flow path of one of the two heat exchange tubes, a first high-pressure flow port communicating with the high-pressure flow path of one of the two heat exchange tubes, a second low-pressure flow port communicating with the low-pressure flow path of the other of the two heat exchange tubes, and a second high-pressure flow port communicating with the high-pressure flow path of the other of the two heat exchange tubes, and a first block attached to one end of the two heat exchange tubes. The heat exchanger further includes a low-pressure communication path that communicates the low-pressure flow path of one of the two heat exchange tubes with the low-pressure flow path of the other of the two heat exchange tubes, a high-pressure communication path that communicates the high-pressure flow path of one of the two heat exchange tubes with the high-pressure flow path of the other of the two heat exchange tubes, and a second block attached to the other end of the two heat exchange tubes.

[0012] In the heat exchanger according to the second aspect, for example, when a high-pressure fluid is allowed to flow in from a first high-pressure fluid inlet provided in the first block and a low-pressure fluid is allowed to flow in from a second low-pressure fluid inlet provided in the first block, heat exchange can be performed between the high-pressure fluid and the low-pressure fluid using two heat exchange tubes.

[0013] More specifically, when a high-pressure fluid is allowed to flow in from the first high-pressure fluid inlet provided in the first block, the high-pressure fluid flows in sequence through the high-pressure flow path of one heat exchange tube, the high-pressure communication path of the second block, and the high-pressure flow path of the other heat exchange tube, and is discharged from the second high-pressure fluid inlet of the first block. Further, when a low-pressure fluid is allowed to flow in from the second low-pressure fluid inlet provided in the first block, the low-pressure fluid flows in sequence through the low-pressure flow path of the other heat exchange tube, the low-pressure communication path of the second block, and the low-pressure flow path of one heat exchange tube, and is discharged from the first low-pressure fluid inlet of the first block, and heat exchange can be performed using both heat exchange tubes, namely one heat exchange tube and the other heat exchange tube.

[0014] Also, since the first block is provided with a first low-pressure fluid inlet, a second low-pressure fluid inlet, a first high-pressure fluid inlet, and a second high-pressure fluid inlet, the pipes connected to these fluid inlets can be concentrated on the first block side, that is, in one place, facilitating the piping work, and enabling the heat exchanger and the pipes to be compactly integrated.

[0015] The heat exchanger according to the third aspect includes one heat exchange tube according to the first aspect, a main block having a main block side low-pressure fluid inlet attached to one end of the heat exchange tube and communicating with the low-pressure flow path of the heat exchange tube, and a main block side high-pressure fluid inlet communicating with the high-pressure flow path of the heat exchange tube, and a sub-block attached to the other end of the heat exchange tube and having a sub-block side low-pressure fluid inlet communicating with the low-pressure flow path of the heat exchange tube, and a sub-block side high-pressure fluid inlet communicating with the high-pressure flow path of the heat exchange tube.

[0016] In the heat exchanger according to the third aspect, for example, by allowing a high-pressure fluid to flow in from the first high-pressure flow port of the main block and a low-pressure fluid to flow in from the second low-pressure flow port of the sub-block, heat exchange can be performed between the high-pressure fluid and the low-pressure fluid using a single heat exchange tube.

[0017] In the heat exchanger according to the fourth aspect, in the heat exchanger according to the second aspect or the third aspect, both end portions in the width direction of the low-pressure porous flat tube are formed in an arc shape, both end portions in the width direction of the high-pressure porous flat tube are formed in an arc shape, and the side wall portion of the outer tube in contact with the end portions in the width direction of the low-pressure porous flat tube and the end portions in the width direction of the high-pressure porous flat tube is formed in a planar shape. In the heat exchange tube, a sub-low-pressure flow path for flowing the low-pressure fluid is formed and surrounded by the arc-shaped end portion of the low-pressure porous flat tube, the arc-shaped end portion of the high-pressure porous flat tube, and the side wall portion of the outer tube.

[0018] In the heat exchange tube of the heat exchanger according to the fourth aspect, by flowing a low-pressure fluid through the low-pressure porous flat tube and a high-pressure fluid through the high-pressure porous flat tube, heat exchange can be performed between the low-pressure fluid and the high-pressure fluid between the low-pressure porous flat tube and the high-pressure porous flat tube. Furthermore, heat exchange can be performed between the sub-low-pressure flow path and the high-pressure porous flat tube between the low-pressure fluid and the high-pressure fluid.

[0019] As described above, in the heat exchanger according to the fourth aspect, since heat exchange can be performed between the sub-low-pressure flow path and the high-pressure porous flat tube between the low-pressure fluid and the high-pressure fluid, the heat exchange efficiency can be improved as compared with the case where heat exchange is performed only between the low-pressure porous flat tube and the high-pressure porous flat tube.

Advantages of the Invention

[0020] As described above, according to the heat exchanger of the present disclosure, the heat exchange efficiency can be improved.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

MODE FOR CARRYING OUT THE INVENTION

[0022] [First Embodiment] (Overall Configuration of Heat Exchanger) The heat exchanger 10 according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 6. As shown in Fig. 1, the heat exchanger 10 of the present embodiment includes a heat exchange tube 12A, a heat exchange tube 12B, a first block 14 to which the heat exchange tube 12A and the heat exchange tube 12B are connected, and a second block 16. In the figure, arrow U indicates the upward direction, arrow D indicates the downward direction, arrow L indicates the left direction, arrow R indicates the right direction, arrow F indicates the forward direction, and arrow B indicates the backward direction.

[0023] (Heat exchange tube) As shown in Fig. 2, in the heat exchange tube 12A, a metal high-pressure porous flat tube 18 formed in a flat shape and a metal low-pressure porous flat tube 20 also formed in a flat shape are alternately laminated. The laminated high-pressure porous flat tube 18 and low-pressure porous flat tube 20 are housed inside a metal exterior tube 22 and integrated. Since the heat exchange tube 12B has the same configuration as the heat exchange tube 12A, the description of its internal structure is omitted. In the present embodiment, the whole in which the high-pressure porous flat tube 18 and the low-pressure porous flat tube 20 are laminated is called a flat tube laminate 23. Note that the high-pressure porous flat tube 18, the low-pressure porous flat tube 20, and the exterior tube 22 can be formed of aluminum, for example.

[0024] The high-pressure porous flat tube 18 formed in a flat shape, in other words, has a thick-plate-like appearance, and inside, a plurality of circular cross-section high-pressure flow paths 18A through which high-pressure fluid passes are arranged linearly at regular intervals along the width direction of the high-pressure porous flat tube 18.

[0025] The low-pressure porous flat tube 20 formed in a flat shape, in other words, has a thick-plate-like appearance, and inside, a plurality of circular cross-section low-pressure flow paths 20A through which low-pressure fluid passes are arranged linearly at regular intervals along the width direction of the low-pressure porous flat tube 20.

[0026] In this embodiment, the low-pressure flow path 20A is formed with a larger diameter than the high-pressure flow path 18A, and the number of low-pressure flow paths 20A per tube is smaller than the number of high-pressure flow paths 18A.

[0027] Note that both ends of the high-pressure porous flat tube 18 and both ends of the low-pressure porous flat tube 20 are each formed in an arc shape in a cross-sectional view cut in a direction intersecting the longitudinal direction of the tube. The high-pressure porous flat tube 18 and the low-pressure porous flat tube 20 are formed with the same width. In this embodiment, two high-pressure porous flat tubes 18 and two low-pressure porous flat tubes 20 are accommodated in a metal exterior tube 22 having a rectangular cross-sectional shape.

[0028] The sides of the high-pressure porous flat tube 18 and the low-pressure porous flat tube 20 are in close contact with each other. Further, the widthwise end portions of the high-pressure porous flat tube 18, the widthwise end portions of the low-pressure porous flat tube 20, the side surfaces of the outermost high-pressure porous flat tube 18 in the stacking direction, and the side surfaces of the outermost low-pressure porous flat tube 20 in the stacking direction are each in close contact with the inner surface of the exterior tube 22.

[0029] The heat exchange tubes 12A and 12B having the above-described configuration can be obtained, for example, by alternately stacking the high-pressure porous flat tube 18 and the low-pressure porous flat tube 20 and inserting them into the exterior tube 22, and then squeezing the exterior tube 22.

[0030] Also, in the heat exchange tube 12A (similarly for the heat exchange tube 12B), a sub-low-pressure flow path 25 having a substantially triangular cross-sectional shape surrounded by the arc-shaped end portion of the low-pressure porous flat tube 20, the arc-shaped end portion of the high-pressure porous flat tube 18, and the flat side wall portion 22A of the exterior tube 22 is formed. Note that in the heat exchange tube 12A (similarly for the heat exchange tube 12B), a part of the high-pressure porous flat tube 18 and a part of the low-pressure porous flat tube 20 protrude from the end portion of the exterior tube 22 (see FIGS. 4 to 6).

[0031] (First Block) (High-pressure system) As shown in FIGS. 1 and 3(B), the first block 14 is formed of a metallic material and has an overall rectangular parallelepiped shape that is long in the left-right direction. The first block 14 includes an upper block 24, a lower block 26, a first high-pressure joint 28, a second high-pressure joint 30, a first low-pressure joint 32, a second low-pressure joint 34, and a lid member 36.

[0032] As shown in FIGS. 3(A) and 3(B), a recess 38 with an upper opening on the left side is formed in the upper block 24.

[0033] A second high-pressure joint 30 is provided on the left side surface of the first block 14, and the recess 38 and the flow port 30A of the second high-pressure joint 30 are connected by a passage 40 formed in the upper block 24 and a passage 30B formed in the second high-pressure joint 30. Note that the flow port 30A is an example of the second high-pressure flow port of the present disclosure.

[0034] The upper end portions of two high-pressure porous flat tubes 18 of the heat exchange tube 12A are inserted into the recess 38. Note that the upper end portions of the high-pressure porous flat tubes 18 protrude above the bottom of the recess 38, and the outer peripheral portion of the high-pressure porous flat tube 18 and the opening portion of the hole in the upper block 24 formed to penetrate the high-pressure porous flat tube 18 are brazed with a brazing material (not shown) so that fluid does not leak.

[0035] Also, a recess 42 with an upper opening on the right side is formed in the upper block 24. A first high-pressure joint 28 is provided on the right side surface of the first block 14, and the recess 42 and the flow port 28A of the first high-pressure joint 28 are connected by a passage 44 formed in the upper block 24 and a passage 28B formed in the first high-pressure joint 28. Note that the flow port 28A is an example of the first high-pressure flow port of the present disclosure.

[0036] As shown in Fig. 3(A), the upper end portions of the two high-pressure porous flat tubes 18 of the heat exchange tube 12B are inserted into the recess 42. The upper end portions of the high-pressure porous flat tubes 18 protrude above the bottom of the recess 42, and the outer peripheral portion of the high-pressure porous flat tube 18 and the opening portion of the hole of the upper block 24 formed to penetrate the high-pressure porous flat tube 18 are brazed with a brazing material (not shown) so that the fluid does not leak.

[0037] In addition, the opening of the left recess 38 and the right recess 42 is closed by a lid member 36 fixed to the upper surface of the upper block 24.

[0038] Further, a slit 46 for providing a heat insulation space is formed in the upper block 24 between the recess 38 and the recess 42.

[0039] (Low-pressure system) As shown in Fig. 4(A) and Fig. 4(B), a recess 48 with an open upper side is formed on the left side of the lower block 26. A low-pressure first joint 32 is provided on the front side surface of the first block 14, and the recess 48 and the flow port 32A of the low-pressure first joint 32 are connected by a passage 50 formed in the lower block 26 and a passage 32B formed in the low-pressure first joint 32.

[0040] The upper end portions of the two low-pressure porous flat tubes 20 of the heat exchange tube 12A are inserted into the recess 48. The upper end of the outer tube 22 is flush with the bottom of the recess 48, and the upper end portion of the low-pressure porous flat tube 20 protrudes above the bottom of the recess 48. The upper end portion of the outer tube 22 of the heat exchange tube 12A and the opening portion of the hole of the lower block 26 formed to penetrate the outer tube 22 are brazed with a brazing material (not shown).

[0041] In addition, the auxiliary low-pressure flow path 25 of the heat exchange tube 12A communicates with the recess 48 of the lower block 26.

[0042] Further, a recess 52 with an upper opening on the right side is formed in the lower block 26. A low-pressure second joint 34 is provided on the rear side surface of the first block 14, and the recess 52 and the flow port 34A of the low-pressure second joint 34 are connected by a passage 54 formed in the lower block 26 and a passage 34B formed in the low-pressure second joint 34.

[0043] The upper end portions of the two low-pressure porous flat tubes 20 of the heat exchange tube 12B are inserted into the recess 52. Note that the upper end portions of the low-pressure porous flat tubes 20 protrude above the bottom of the recess 52. The upper end portion of the outer tube 22 of the heat exchange tube 12B and the opening portion of the hole in the lower block 26 formed to penetrate the outer tube 22 are brazed with a brazing material (not shown). Note that the auxiliary low-pressure flow path 25 (see FIG. 4B) of the heat exchange tube 12B communicates with the recess 52 in the lower block 26.

[0044] The recess 48 on the left side and the recess 52 on the right side of the lower block 26 are closed at their openings by an upper block 24 fixed to the upper surface of the lower block 26.

[0045] Further, a slit 56 for providing a heat insulation space is formed in the lower block 26 between the recess 48 and the recess 52.

[0046] (Second Block) As shown in FIGS. 1, 5(A), and 5(B), the second block 16 is formed of a metal material and has an overall rectangular parallelepiped shape that is long in the left-right direction. The second block 16 includes an upper block 60, a lower block 62, and a lid member 64.

[0047] (High-pressure System Flow Path Configuration) A recess 66 with a lower opening on the left side is formed in the lower block 62, and a recess 68 with a lower opening on the right side is formed. The recess 66 and the recess 68 communicate with each other through a groove-shaped high-pressure communication passage 70.

[0048] The lower end portions of the two high-pressure porous flat tubes 18 of the heat exchange tube 12A are inserted into the recess 66, and the lower end portions of the two high-pressure porous flat tubes 18 of the heat exchange tube 12B are inserted into the recess 68.

[0049] Note that the lower end of the high-pressure porous flat tube 18 of the heat exchange tube 12A protrudes below the bottom of the recess 66, and in order to prevent fluid leakage, the outer peripheral portion of the high-pressure porous flat tube 18 and the opening portion of the hole of the lower block 62 formed to penetrate the high-pressure porous flat tube 18 are brazed with a brazing material (not shown). With the above configuration, the recess 66 of the second block 16 and the recess 38 of the first block 14 are connected by the high-pressure flow path 18A of the high-pressure porous flat tube 18 provided in the heat exchange tube 12A.

[0050] Also, the lower end portion of the high-pressure porous flat tube 18 of the heat exchange tube 12B protrudes below the bottom of the recess 68, and in order to prevent fluid leakage, the outer peripheral portion of the high-pressure porous flat tube 18 and the opening portion of the hole of the lower block 62 formed to penetrate the high-pressure porous flat tube 18 are brazed with a brazing material (not shown). With the above configuration, the recess 68 of the second block 16 and the recess 42 of the first block 14 are connected by the high-pressure flow path 18A of the high-pressure porous flat tube 18 provided in the heat exchange tube 12B.

[0051] Note that the opening of the left recess 66, the right recess 68, and the high-pressure communication path 70 is closed by a lid member 64 fixed to the lower surface of the lower block 62.

[0052] (Low-pressure system flow path configuration) As shown in FIGS. 6(A) and 6(B), a recess 72 with an open lower side is formed on the left side of the upper block 60, and a recess 74 with an open lower side is formed on the right side. The recess 72 and the recess 74 communicate with each other through a groove-shaped low-pressure communication path 76.

[0053] In the recess 72, the lower end portions of the two low-pressure porous flat tubes 20 of the heat exchange tube 12A are inserted, and in the recess 74, the lower end portions of the two low-pressure porous flat tubes 20 of the heat exchange tube 12B are inserted. Note that the lower end of the low-pressure porous flat tube 20 of the heat exchange tube 12A protrudes below the bottom of the recess 72. Also, the lower end of the low-pressure porous flat tube 20 of the heat exchange tube 12B protrudes below the bottom of the recess 74.

[0054] The lower end portion of the outer tube 22 of the heat exchange tube 12A and the opening portion of the hole of the upper block 60 formed to penetrate the outer tube 22 are brazed with a brazing material (not shown). Note that the auxiliary low-pressure flow path 25 of the heat exchange tube 12A communicates with the recess 72 of the upper block 60.

[0055] With the above configuration, the recess 72 of the second block 16 and the recess 48 of the first block 14 are connected by the low-pressure flow path 20A of the low-pressure porous flat tube 20 of the heat exchange tube 12A and the auxiliary low-pressure flow path 25.

[0056] In the recess 74, the lower end portions of the two low-pressure porous flat tubes 20 of the heat exchange tube 12B are inserted. Note that the lower end of the low-pressure porous flat tube 20 protrudes below the bottom of the recess 74.

[0057] The lower end portion of the outer tube 22 of the heat exchange tube 12B and the opening portion of the hole of the upper block 60 formed to penetrate the outer tube 22 are brazed with a brazing material (not shown). Note that the auxiliary low-pressure flow path 25 of the heat exchange tube 12B communicates with the recess 74 of the upper block 60.

[0058] With the above configuration, the recess 74 of the second block 16 and the recess 52 of the first block 14 are connected by the low-pressure flow path 20A of the low-pressure porous flat tube 20 of the heat exchange tube 12B and the auxiliary low-pressure flow path 25.

[0059] Note that the openings of the left concave portion 72, the right concave portion 74, and the low-pressure communication passage 76 are blocked by the lower block 62.

[0060] (Function, Effect) Next, the function and effect of the heat exchanger 10 of the present embodiment will be described. In the heat exchanger 10 of the present embodiment, as an example, by flowing a high-pressure and high-temperature fluid from the high-pressure first joint 28 and a low-temperature and low-pressure fluid from the low-pressure first joint 32, heat exchange can be performed between the high-pressure and high-temperature fluid and the low-temperature and low-pressure fluid in the heat exchange tubes 12A and the heat exchange tubes 12B.

[0061] More specifically, in the heat exchange tubes 12A and the heat exchange tubes 12B, since the high-pressure porous flat tubes 18 and the low-pressure porous flat tubes 20 are alternately laminated and the side surfaces are in close contact with each other, the high-pressure porous flat tubes 18 and the low-pressure porous flat tubes 20 can perform heat exchange of the fluid at the side surface portions.

[0062] Furthermore, in the heat exchange tubes 12A and the heat exchange tubes 12B, since the widthwise end portions of the high-pressure porous flat tubes 18, the widthwise end portions of the low-pressure porous flat tubes 20, the side surfaces of the outermost high-pressure porous flat tubes 18 in the lamination direction, and the side surfaces of the outermost low-pressure porous flat tubes 20 in the lamination direction are in close contact with the inner surface of the outer tube 22, respectively, the high-pressure porous flat tubes 18 and the low-pressure porous flat tubes 20 can also perform heat exchange through the outer tube 22.

[0063] Furthermore, in the heat exchange tubes 12A and the heat exchange tubes 12B, heat exchange can be performed between the low-pressure fluid flowing through the sub-low-pressure flow path 25 and the high-pressure fluid flowing through the high-pressure flow path 18A of the high-pressure porous flat tube 18. As described above, in the heat exchange tubes 12A and the heat exchange tubes 12B, heat exchange can be performed not only at the contact portions between the side surfaces of the high-pressure porous flat tubes 18 and the side surfaces of the low-pressure porous flat tubes 20, but also in the outer tube 22 and the sub-low-pressure flow path 25. Therefore, the heat exchange efficiency can be improved compared to the prior art.

[0064] Note that the high-pressure fluid that has flowed in from the high-pressure first joint 28 and has completed heat exchange is discharged to the outside from the high-pressure second joint 30, and the low-pressure fluid that has flowed in from the low-pressure first joint 32 and has completed heat exchange is discharged to the outside from the low-pressure second joint 34.

[0065] In this embodiment, a high-pressure fluid is allowed to flow in from the high-pressure first joint 28, and a low-pressure fluid is allowed to flow in from the low-pressure first joint 32 to perform heat exchange. However, a high-pressure fluid may be allowed to flow in from the high-pressure first joint 28, and a low-pressure fluid may be allowed to flow in from the low-pressure second joint 34. Even in this case, heat exchange between the low-pressure fluid and the high-pressure fluid can be performed.

[0066] [Second Embodiment] The heat exchanger 10 according to the second embodiment of the present disclosure will be described with reference to FIGS. 7 and 8. As shown in FIG. 7, the heat exchanger 10 according to the second embodiment includes one heat exchange tube 12, a main block 80 to which one end of the heat exchange tube 12 is connected, and a sub-block 82 to which the other end of the heat exchange tube 12 is connected.

[0067] The main block 80 is formed of a metal material and has a substantially cubic shape. The main block 80 includes an upper block 84, a lower block 86, a lid member 88, a high-pressure first joint 28, and a low-pressure second joint 34. As shown in FIGS. 7 and 8, the sub-block 82 has the same configuration as the main block 80 and is symmetrically shaped with respect to the main block 80 above and below with the heat exchange tube 12 as the center.

[0068] In the second embodiment, the flow port 28A is an example of the first high-pressure flow port on the main block side of the present disclosure, the flow port 30A is an example of the second high-pressure flow port on the sub-block side of the present disclosure, the flow port 32A is an example of the second low-pressure flow port on the sub-block side of the present disclosure, and the flow port 34A is an example of the first low-pressure flow port on the main block side of the present disclosure.

[0069] In the heat exchanger 10 of the present embodiment, as an example, by allowing a high-pressure and high-temperature fluid to flow in from the high-pressure first joint 28 of the main block 80 and a low-temperature and low-pressure fluid to flow in from the low-pressure first joint 32 of the sub-block 82, heat exchange can be performed between the high-pressure and high-temperature fluid and the low-temperature and low-pressure fluid in a single heat exchange tube 12.

[0070] The second heat exchanger 10 is different from the first embodiment in that heat exchange is performed in a single heat exchange tube 12, but the same operations and effects as those of the first embodiment can be obtained.

[0071] [Other Embodiments] As described above, one embodiment of the present disclosure has been described. However, the present disclosure is not limited to the above, and it goes without saying that various modifications can be made within the scope not departing from the gist thereof.

[0072] In the above embodiment, the sub-low-pressure flow path 25 was provided in the heat exchange tube 12A (similarly for the heat exchange tube 12B). However, the sub-low-pressure flow path 25 may be provided as needed, and it may not be provided. For example, by making the cross-sectional shapes of the high-pressure porous flat tube 18 and the low-pressure porous flat tube 20 inserted inside the outer tube 22 rectangular, the sub-low-pressure flow path 25 can be eliminated.

[0073] In the heat exchange tubes 12A and 12B of the first embodiment, two high-pressure porous flat tubes 18 and two low-pressure porous flat tubes 20 were provided inside the outer tube 22. However, the present disclosure is not limited to this. As shown in FIG. 9, the number of the high-pressure porous flat tubes 18 and the low-pressure porous flat tubes 20 provided inside the outer tube 22 may each be three, or may be four or more. The number of the high-pressure porous flat tubes 18 and the low-pressure porous flat tubes 20 can be increased or decreased according to the required heat exchange capacity. Of course, the number of the high-pressure porous flat tubes 18 and the number of the low-pressure porous flat tubes 20 may be different.

[0074] In the heat exchange tubes 12A and 12B, the cross-sectional shapes of the low-pressure flow path 20A and the high-pressure flow path 18A were each circular. However, the present disclosure is not limited thereto. As shown in FIG. 10, the cross-sectional shapes of the low-pressure flow path 20A and the high-pressure flow path 18A may be rectangular, or may be shapes other than circular and rectangular.

Explanation of Signs

[0075] 10 Heat exchanger 12 Heat exchange tube 12A Heat exchange tube 12B Heat exchange tube 14 First block 16 Second block 18 High-pressure porous flat tube 18A High-pressure flow path 20 Low-pressure porous flat tube 20A Low-pressure flow path 22 Exterior tube 23 Flat tube laminate 25 Secondary low-pressure flow path 28A Flow port (first high-pressure flow port on the main block side) 30A Flow port (second high-pressure flow port on the sub-block side) 32A Flow port (second low-pressure flow port on the sub-block side) 34A Flow port (first low-pressure flow port on the main block side) 70 High-pressure communication path 76 Low-pressure communication path 80 Main block 82 Sub-block

Claims

1. A low-pressure porous flat tube in which a plurality of low-pressure flow paths through which a low-pressure fluid flows are arranged along one direction, and a high-pressure porous flat tube in which a plurality of high-pressure flow paths through which a high-pressure fluid flows are arranged along one direction are alternately laminated in the tube thickness direction, which is a direction intersecting the one direction, and a flat tube laminate in which the side surfaces of the low-pressure porous flat tube and the side surfaces of the high-pressure porous flat tube are in close contact with each other, An exterior tube into which the flat tube laminate is inserted and provided so as to contact the outer peripheral portion of the flat tube laminate, A heat exchange tube having the same.

2. The two heat exchange tubes according to Claim 1, A first low-pressure flow port communicating with the low-pressure flow path of one of the two heat exchange tubes and a first high-pressure flow port communicating with the high-pressure flow path of one of the two heat exchange tubes, and a second low-pressure flow port communicating with the low-pressure flow path of the other of the two heat exchange tubes and a second high-pressure flow port communicating with the high-pressure flow path of the other of the two heat exchange tubes, and a first block attached to one end of the two heat exchange tubes, A low-pressure communication path communicating the low-pressure flow path of one of the two heat exchange tubes and the low-pressure flow path of the other of the two heat exchange tubes, and a high-pressure communication path communicating the high-pressure flow path of one of the two heat exchange tubes and the high-pressure flow path of the other of the two heat exchange tubes, and a second block attached to the other end of the two heat exchange tubes, A heat exchanger having the same.

3. One heat exchange tube according to Claim 1, A main block attached to one end of the heat exchange tube and having a main block side low-pressure flow port communicating with the low-pressure flow path of the heat exchange tube and a main block side high-pressure flow port communicating with the high-pressure flow path of the heat exchange tube, A sub-block attached to the other end of the heat exchange tube and having a sub-block side low-pressure flow port communicating with the low-pressure flow path of the heat exchange tube and a sub-block side high-pressure flow port communicating with the high-pressure flow path of the heat exchange tube, A heat exchanger having the same.

4. Both end portions in the width direction of the low-pressure porous flat tube are formed in an arc shape, Both end portions in the width direction of the high-pressure porous flat tube are formed in an arc shape, The side wall portion of the exterior tube in contact with the width direction end portion of the low-pressure porous flat tube and the width direction end portion of the high-pressure porous flat tube is formed in a planar shape, In the heat exchange tube, a sub-low pressure flow path for flowing the low-pressure fluid is formed, which is surrounded by an end portion formed in an arc shape of the low-pressure porous flat tube, an end portion formed in an arc shape of the high-pressure porous flat tube, and a side wall portion of the exterior tube. The heat exchanger according to claim 2 or claim 3.

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