heat exchanger

Abstract

To improve heat exchange efficiency between a first fluid within heat transfer pipes and a second fluid at the outer side of the heat transfer pipes.SOLUTION: A heat exchanger includes: a pipe body formed with a passage to which a first fluid is supplied; a pair of partition plates which are disposed spaced apart from each other in an extension direction of the pipe body and define a closed space at a part of the passage; multiple heat transfer pipes which extend in the extension direction so as to penetrate through the pair of partition plates and arranged spaced apart from each other; a supply part which may supply a second fluid from the outside of the pipe body to the closed space; a discharge part which may discharge the second fluid in the closed space to the outside; and a passage formation part in which multiple small passage parts are formed between the heat transfer pipes located adjacent to each other with the closest spacing formed therebetween of the multiple heat transfer pipes. The second fluid circulates between the multiple heat transfer pipes so as to flow in an opposite direction of a circulation direction of the first fluid in the closed space. The multiple small passage parts are disposed at positions different from each other when viewed from a position where the discharge part is placed in the extension direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a heat exchanger. [Background technology]

[0002] Some heat exchangers are configured to include a pipe and a plurality of heat transfer tubes arranged within the pipe. A heat exchanger configured in this manner exchanges heat between a first fluid flowing within the plurality of heat transfer tubes and a second fluid flowing within the pipe outside the heat transfer tubes. For example, Patent Document 1 discloses a configuration in which fins are provided on the heat transfer tubes. By providing fins on the heat transfer tubes, the efficiency of heat exchange between the first fluid flowing within the heat transfer tube and the second fluid flowing outside the heat transfer tubes is improved. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-223520 Summary of the Invention [Problem to be solved by the invention]

[0004] However, it is sometimes desirable to reduce the size of a heat exchanger. In such cases, narrowing the gaps between multiple heat transfer tubes arranged in a piping system reduces the cross-sectional area of ​​the flow path of the second fluid flowing outside the heat transfer tubes. As a result, the heat exchange efficiency between the first fluid inside the heat transfer tubes and the second fluid outside the heat transfer tubes may decrease. Therefore, it is desirable to improve the heat exchange efficiency between the first fluid inside the heat transfer tubes and the second fluid outside the heat transfer tubes even in a configuration in which the gaps between multiple heat transfer tubes are narrowed.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a heat exchanger that can improve the heat exchange efficiency between a first fluid inside a heat transfer tube and a second fluid outside the heat transfer tube. [Means for solving the problem]

[0006] In order to solve the above problems, a heat exchanger according to the present disclosure includes a piping body forming a flow path to which a first fluid is supplied, a pair of partition plates arranged at intervals in an extension direction of the piping body, blocking a part of the flow path in the extension direction and defining a closed space in a part of the flow path, a plurality of heat transfer tubes having tubular shapes with open ends, extending in the extension direction so as to penetrate the pair of partition plates, and arranged side by side at intervals from each other, a supply unit capable of supplying a second fluid from outside the piping body into the closed space, and a supply unit configured to supply a second fluid from outside the piping body into the closed space. a discharge section disposed at an interval from the supply section in the extension direction and capable of discharging the second fluid in the closed space to the outside of the piping main body; and a flow path forming section that forms a plurality of small flow path sections between the heat transfer tubes that are adjacent to each other at positions closest to each other among the plurality of heat transfer tubes, wherein the second fluid flows between the plurality of heat transfer tubes in the closed space in a direction opposite to a flow direction of the first fluid, and the plurality of small flow path sections are disposed at positions different from each other when viewed from a position where the discharge section is disposed in the extension direction. The flow path forming portion forms, as the small flow path portions, a first small flow path portion that is arranged in a position close to one of the two heat transfer tubes that are adjacent to each other at the closest position, and a second small flow path portion that is arranged in a position close to the other of the two heat transfer tubes that are adjacent to each other at the closest position and that is arranged at a position shifted in the circumferential direction of the heat transfer tube with respect to the first small flow path portion when viewed from the extension direction, and the first small flow path portion and the second small flow path portion are arranged in a staggered manner when viewed from the extension direction. are. Another heat exchanger according to the present disclosure includes a piping main body forming a flow path through which a first fluid is supplied, a pair of partition plates arranged at intervals in an extension direction of the piping main body, blocking a part of the flow path in the extension direction and defining a closed space in a part of the flow path, a plurality of tubular heat transfer tubes open at both ends, extending in the extension direction so as to penetrate the pair of partition plates, and arranged side by side at intervals from each other, a supply unit capable of supplying a second fluid from outside the piping main body into the closed space, a discharge unit arranged at intervals from the supply unit in the extension direction and capable of discharging the second fluid in the closed space to the outside of the piping main body, and a flow path forming unit forming a plurality of small flow path portions between the heat transfer tubes adjacent to each other at positions closest to each other among the plurality of heat transfer tubes, and the second fluid flows in the closed space in a direction opposite to the flow direction of the first fluid. The small flow path portions are arranged at different positions from each other when viewed from the position in the extension direction where the discharge portion is arranged, and the flow path forming portion comprises a plurality of first convex portions that protrude from the outer surface of one of the two heat transfer tubes that are closest to each other toward the other heat transfer tube and extend in the extension direction, and are arranged at intervals in the circumferential direction of the heat transfer tube, and a plurality of second convex portions that protrude from the outer surface of the other heat transfer tube toward one of the heat transfer tubes and extend in the extension direction, and are arranged at intervals in the circumferential direction, and when viewed from the extension direction, the first convex portions and the second convex portions are arranged offset in the circumferential direction, and when viewed from the extension direction, a portion of the tip of the first convex portion and a portion of the tip of the second convex portion that are adjacent to each other in the circumferential direction are connected. [Effects of the Invention]

[0007] According to the heat exchanger of the present disclosure, it is possible to improve the efficiency of heat exchange between the first fluid inside the heat transfer tube and the second fluid outside the heat transfer tube. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating a schematic configuration of a heat exchanger according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view showing the internal structure of the heat exchanger according to the first embodiment of the present disclosure. [Figure 3] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along the arrow BB in FIG. [Figure 5] FIG. 3 is an enlarged cross-sectional view showing a flow path forming portion of the heat exchanger. [Figure 6] 10A and 10B are diagrams illustrating a flow path forming portion of a heat exchanger according to a modified example of the first embodiment of the present disclosure. [Figure 7] FIG. 10 is a cross-sectional view perpendicular to the facing direction, showing a flow path forming portion of a heat exchanger according to a second embodiment of the present disclosure. [Figure 8] FIG. 10 is a cross-sectional view showing the internal structure of a heat exchanger according to a third embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments for carrying out a heat exchanger according to the present disclosure will be described with reference to the accompanying drawings. However, the present disclosure is not limited to these embodiments.

[0010] (Heat exchanger configuration) As shown in FIG. 1 , the heat exchanger 100A is disposed midway through a pipe 10. The pipe 10 forms a flow path 10r through which a first fluid H flows. In this embodiment, the first fluid H, for example, hydrogen gas, flows through the flow path 10r within the pipe 10. In this embodiment, the pipe 10 includes a straight pipe body 11 and elbow portions 12 disposed at both ends of the pipe body 11. The elbow portions 12 form a bent portion 10c of the flow path 10r. The elbow portions 12 are connected to the pipe body 11. A plurality of vanes 13 are disposed within the elbow portions 12 to guide the flow direction of the first fluid H to the bent portion 10c. Each vane 13 is curved along the curve of the elbow portions 12. A plurality of such vanes 13 are disposed within the elbow portions 12 at intervals in the width direction of the flow path 10r. Note that the arrangement of the pipe body 11 is not limited to being connected to a curved portion of the pipe 10, such as the elbow portions 12. The pipe body 11 may be disposed as a part of the pipe 10 .

[0011] 1 and 2, in this embodiment, the heat exchanger 100A is installed at a position where the piping main body 11 is disposed so as to form a part of the piping 10. The heat exchanger 100A includes the piping main body 11 that forms the outer shell of the heat exchanger 100A, a pair of partition plates 20, a supply section 21, a discharge section 22, and a core section 30A.

[0012] The pair of partition plates 20 are arranged at an interval in the extension direction Da, which is the direction in which the piping 10 extends. The pair of partition plates 20 are arranged at both ends of the piping main body 11 in the extension direction Da. The pair of partition plates 20 includes a first partition plate 20A arranged on one side (first side) Da1 of the piping main body 11 in the extension direction Da, and a second partition plate 20B arranged on the other side (second side) Da2 of the piping main body 11 in the extension direction Da. Here, the one side Da1 of the extension direction Da is the downstream side in the flow direction of the first fluid H in the piping main body 11. The other side Da2 of the extension direction Da is the upstream side in the flow direction of the first fluid H in the piping main body 11. The pair of partition plates 20 (first partition plate 20A and second partition plate 20B) each have a plate shape extending along a plane perpendicular to (intersecting with) the extension direction Da. Each of the pair of partition plates 20 closes a part of the flow path 10r in the extension direction Da. A closed space Sc is formed in a part of the flow path 10r in the pipe 10, and is partitioned by the first partition plate 20A and the second partition plate 20B.

[0013] The supply unit 21 is disposed on one side Da1 in the extension direction Da of the piping main body 11. The supply unit 21 is connected to the piping main body 11 as an inlet-side header. The supply unit 21 is configured to be able to supply the second fluid L introduced from the outside to the closed space Sc in the piping main body 11. As shown in FIG. 2, the supply unit 21 has a cylindrical supply unit main body 211 with both ends open in the extension direction Da. The opening on one side Da1 of the supply unit main body 211 in the extension direction Da is closed by the first partition plate 20A. The opening on the other side Da2 of the supply unit main body 211 in the extension direction Da is connected to the inside of the piping main body 11. The supply unit main body 211 has a supply port 212 formed on the other side Da2 in the extension direction Da with respect to the first partition plate 20A, connecting the outside with the inside of the closed space Sc. As shown in FIG. 3, the supply port 212 is able to supply the second fluid L from the outside into the closed space Sc.

[0014] The discharge section 22 is disposed on the other side Da2 in the extension direction Da relative to the piping main body 11. The discharge section 22 is connected to the piping main body 11 as an outlet-side header. The discharge section 22 is configured to be able to discharge the second fluid L from the closed space Sc in the piping main body 11 to the outside. The discharge section 22 has a cylindrical discharge section main body 221 that is open at both ends in the extension direction Da. The opening on the other side Da2 in the extension direction Da of the discharge section main body 221 is closed by the second partition plate 20B. The opening on one side Da1 in the extension direction Da of the discharge section main body 221 is connected to the inside of the piping main body 11. The discharge section main body 221 has a discharge port 222 that connects the inside of the closed space Sc to the outside, formed on the one side Da1 in the extension direction Da relative to the second partition plate 20B. As shown in FIG. 3 , the discharge port 222 is able to discharge the second fluid L from the inside of the closed space Sc to the outside.

[0015] 2, the core portion 30A is disposed inside the piping main body 11. A first end portion 30a on one side Da1 in the extension direction Da of the core portion 30A is covered from the outside by a supply portion main body 211. A second end portion 30b on the other side Da2 in the extension direction Da of the core portion 30A is covered from the outside by a discharge portion main body 221. The core portion 30A includes a plurality of heat transfer tubes 31 and a flow path forming portion 40A.

[0016] The plurality of heat transfer tubes 31 are arranged inside the piping body 11. The plurality of heat transfer tubes 31 each extend in an extension direction Da (a direction perpendicular to the plane of FIG. 4 ). An end portion on one side Da1 in the extension direction Da of each heat transfer tube 31 is arranged in the supply section 21. An end portion on the other side Da2 in the extension direction Da of each heat transfer tube 31 is arranged in the discharge section 22. Both ends of each heat transfer tube 31 in the extension direction Da are open. Both ends of each heat transfer tube 31 in the extension direction Da are arranged outside the pair of partition plates 20 in the extension direction Da so as to penetrate through the pair of partition plates 20. Both ends of each heat transfer tube 31 are open at positions facing the elbow sections 12.

[0017] The heat transfer tubes 31 are arranged in the piping body 11 at intervals in a direction perpendicular (intersecting) to the extending direction Da. As shown in FIGS. 3 and 4 , the heat transfer tubes 31 are arranged in multiple stages in a vertical direction Dv perpendicular to the extending direction Da when viewed from the extending direction Da. In each stage in the vertical direction Dv, multiple heat transfer tubes 31 are arranged in a horizontal direction Dh perpendicular to the extending direction Da and the vertical direction Dv. The vertical direction Dv and the horizontal direction Dh are each one of the radial directions in the piping body 11. The heat transfer tubes 31 in a stage located on the upper Dvu side in the vertical direction Dv and the heat transfer tubes 31 in a stage located on the lower Dvd side in the vertical direction Dv are arranged with a shift in position in the horizontal direction Dh. The heat transfer tubes 31 are arranged in a honeycomb pattern when viewed from the extending direction Da. The plurality of heat transfer tubes 31 are arranged so that the central positions (central axes 31c) form a hexagonal shape as a whole when viewed from the extension direction Da.

[0018] Each heat transfer tube 31 has a cross-sectional shape along a plane perpendicular to the extending direction Da, e.g., a hexagonal shape. That is, each heat transfer tube 31 has six outer surfaces 32 extending in the circumferential direction Dc of the heat transfer tube 31 when viewed from the extending direction Da. Each heat transfer tube 31 is arranged such that one apex 31t faces upward Dvu in the vertical direction Dv and the other apex 31b faces downward Dvd in the vertical direction Dv. The heat transfer tubes 31 are arranged so that the outer surfaces 32 of adjacent heat transfer tubes 31 are parallel to each other. As shown in FIG. 5 , the outer surfaces 32 of adjacent heat transfer tubes 31 in the horizontal direction Dh face each other with a gap in the horizontal direction Dh. The outer surfaces 32 of adjacent heat transfer tubes 31 in a diagonal direction inclined relative to the vertical direction Dv face each other with a gap in the diagonal direction intersecting the vertical direction Dv and the horizontal direction Dh. The distance between the outer surfaces 32 of two adjacent heat transfer tubes 31 is constant when viewed from the extension direction Da. In the following description, the direction connecting the central axes 31c of the two adjacent heat transfer tubes 31 at the closest positions is referred to as the opposing direction Dt.

[0019] The flow path forming portion 40A forms a plurality of small flow path portions 45 between the heat transfer tubes 31 that are closest to each other in an imaginary plane perpendicular to the extending direction Da in the plurality of heat transfer tubes 31. The flow path forming portion 40A includes a plurality of first convex portions 41 and a plurality of second convex portions 42.

[0020] The plurality of first convex portions 41 are formed on each outer surface 32 of one heat transfer tube (first heat transfer tube) 31A of two heat transfer tubes 31A and 31B that are closest to each other. Each first convex portion 41 protrudes from each outer surface 32 of one heat transfer tube 31A toward the other heat transfer tube (second heat transfer tube) 31B in the opposing direction Dt. When viewed from the extending direction Da, the plurality of first convex portions 41 are arranged at intervals in the circumferential direction Dc of each heat transfer tube 31A along each outer surface 32 of one heat transfer tube 31A. In other words, a plurality of first convex portions 41 are formed on one outer surface 32. When viewed from the extending direction Da, each first convex portion 41 has a rectangular cross-sectional shape and extends in the extending direction Da.

[0021] The multiple second protrusions 42 are formed on each outer surface 32 of the other heat transfer tube 31B of the two heat transfer tubes 31A and 31B that are closest to each other. Each second protrusion 42 protrudes from the outer surface 32 of the other heat transfer tube 31B in the opposing direction Dt toward the one heat transfer tube 31A. When viewed from the extension direction Da, the multiple second protrusions 42 are arranged at intervals in the circumferential direction Dc of each heat transfer tube 31B along each outer surface 32 of the other heat transfer tube 31B. In other words, multiple second protrusions 42 are formed on one outer surface 32. When viewed from the extension direction Da, each second protrusion 42 has a rectangular cross-sectional shape and extends in the extension direction Da.

[0022] The first protrusions 41 and the second protrusions 42 are arranged to be offset in the circumferential direction Dc when viewed from the extension direction Da. When viewed from the extension direction Da, the first protrusions 41 and the second protrusions 42 are connected such that a portion of the tip 41s of the first protrusions 41 and a portion of the tip 42s of the second protrusions 42 that are adjacent to each other in the circumferential direction Dc are connected. Specifically, when viewed from the extension direction Da, the first protrusions 41 and the second protrusions 42 each having a rectangular cross-sectional shape are connected such that a corner of the tip 41s of the first protrusion 41 and a corner of the tip 42s of the second protrusion 42 are connected.

[0023] The flow path forming portion 40A forms a plurality of small flow path portions 45 by a plurality of first convex portions 41 and a plurality of second convex portions 42. The plurality of small flow path portions 45 are formed between each outer surface 32 of one heat transfer tube 31A and the other heat transfer tube 31B. The plurality of small flow path portions 45 include first small flow path portions 45A and second small flow path portions 45B.

[0024] The first small flow path portion 45A is a space between adjacent first convex portions 41 in the circumferential direction Dc and surrounded by the outer surfaces 32 of one heat transfer tube 31A and the tips 42s of the second convex portions 42 formed on the other heat transfer tube 31B. The first small flow path portion 45A is disposed at a position close to one heat transfer tube 31A of the two heat transfer tubes 31A and 31B that are adjacent to each other at the closest position in the opposing direction Dt.

[0025] The second small flow path portion 45B is a space between the second convex portions 42 adjacent to each other in the circumferential direction Dc, surrounded by each outer surface 32 of the other heat transfer tube 31B and the tip 41s of the first convex portion 41 formed on the one heat transfer tube 31A side. The second small flow path portion 45B is disposed at a position close to the other heat transfer tube 31B of the two heat transfer tubes 31A and 31B adjacent to each other at the closest position in the opposing direction Dt.

[0026] The first and second small flow path portions 45A and 45B are arranged at different positions from each other when viewed from the position where the discharge portion 22 is arranged in the extension direction Da. The first and second small flow path portions 45A and 45B are arranged at different positions from each other in both the opposing direction Dt and the circumferential direction Dc. In this way, the first and second small flow path portions 45A and 45B are arranged in a staggered pattern when viewed from the extension direction Da.

[0027] 2, such a flow path forming portion 40A is formed in a portion of the core portion 30A in the extension direction Da. The flow path forming portion 40A is formed only in the core intermediate portion 30c between the first end portion 30a on one side Da1 in the extension direction Da and the second end portion 30b on the other side Da2 in the extension direction Da. The flow path forming portion 40A is formed in a portion between the pair of partition plates 20, excluding the supply portion 21 and the discharge portion 22. In other words, in the core portion 30A, the plurality of small flow path portions 45 are not formed between the plurality of heat transfer tubes 31 at the first end portion 30a corresponding to the supply portion 21 in the extension direction Da and the second end portion 30b corresponding to the discharge portion 22, and gaps 38a and 38b are formed.

[0028] Each component of the heat exchanger 100A having the above-described configuration is preferably formed by a 3D printer technology such as additive modeling (AM). Titanium alloys and stainless steel alloys (SUS) are preferably used as materials for forming the heat exchanger 100A.

[0029] In the heat exchanger 100A, as shown in FIG. 1, the first fluid H flows through the flow path 10r in the piping 10 from the other side Da2 in the extension direction Da to the one side Da1. The first fluid H flows through the elbow portion 12 disposed on the other side Da2 in the extension direction Da relative to the piping body 11 and enters the heat transfer tubes 31. The first fluid H flows into each heat transfer tube 31 from the end of the heat transfer tube 31 that opens on the other side Da2 in the extension direction Da relative to the second partition plate 20B. In other words, the first fluid H does not flow into the closed space Sc on the one side Da1 in the extension direction Da relative to the second partition plate 20B, but only into the heat transfer tubes 31. The first fluid H flows through the multiple heat transfer tubes 31 from the other side Da2 in the extension direction Da to the one side Da1. The first fluid H that has flowed through the heat transfer tube 31 flows out into the elbow portion 12 that is arranged on one side Da1 in the extension direction Da with respect to the piping body 11. The first fluid H that has flowed through the heat transfer tube 31 flows into the elbow portion 12 from the end of the heat transfer tube 31 that opens on the one side Da1 in the extension direction Da with respect to the first partition plate 20A.

[0030] As shown in FIG. 2, the second fluid L, which is fed from outside the heat exchanger 100A, flows into the closed space Sc of the piping main body 11 through the supply port 212 of the supply unit 21. The second fluid L is a liquid that cools the first fluid H, which is the object to be cooled. The second fluid L is, for example, liquid oxygen. The second fluid L flows into the spaces between the heat transfer tubes 31 arranged in the closed space Sc through gaps 38a formed between the heat transfer tubes 31 at the first end 30a of the core member 30A arranged in the supply unit 21. Specifically, the second fluid L flows from the gaps 38a into the small flow path portions 45. The second fluid L flows through the small flow path portions 45 from one side Da1 to the other side Da2 in the extension direction Da. In other words, the second fluid L flows in the opposite direction to the first fluid H in the extension direction Da. As the second fluid L flows through the small flow path portions 45, it exchanges heat with the first fluid H flowing inside the heat transfer tube 31, thereby cooling the first fluid H. The second fluid L reaches the gaps 38b of the second end portion 30b of the core portion 30A arranged in the discharge portion 22 from the plurality of small flow path portions 45. Thereafter, the second fluid L is discharged to the outside from the discharge port 222 of the discharge portion 22, and flows out of the closed space Sc.

[0031] (Action and effect) In the heat exchanger 100A configured as described above, a plurality of small flow path portions 45 are formed by the flow path forming portion 40A between the heat transfer tubes 31 that are closest to each other. Furthermore, the small flow path portions 45 are arranged at different positions when viewed from the position of the discharge portion 22 in the extension direction Da. Therefore, when the second fluid L flows through the plurality of small flow path portions 45, the second fluid L flows in contact with the flow path forming portion 40A that forms the inner surface of each small flow path portion 45. This ensures a large contact surface area between the heat transfer tubes 31 that are closest to each other. Furthermore, the cross-sectional area of ​​each small flow path portion 45, as viewed in the extension direction Da, is smaller than the gap between the heat transfer tubes 31 that are closest to each other. Therefore, the flow velocity of the second fluid L flowing into the small flow path portion 45 increases. As a result, the second fluid L flows through the plurality of small flow path portions 45, thereby increasing the heat transfer efficiency compared to when the second fluid L flows through gaps between the heat transfer tubes 31 that do not have the small flow path portions 45. As a result, the heat exchange efficiency between the first fluid H inside the heat transfer tubes 31 and the second fluid L outside the heat transfer tubes 31 can be increased.

[0032] The flow path forming portion 40A also forms a first small flow path portion 45A positioned near one heat transfer tube 31A and a second small flow path portion 45B positioned near the other heat transfer tube 31B. In particular, in this embodiment, the first small flow path portion 45A and the second small flow path portion 45B are positioned so as to be offset in the opposing direction Dt and the circumferential direction Dc between two adjacent heat transfer tubes 31. In this manner, the first small flow path portion 45A and the second small flow path portion 45B are arranged in a staggered pattern when viewed from the extension direction Da. As a result, the cross-sectional areas of the first small flow path portion 45A and the second small flow path portion 45B when viewed from the extension direction Da are smaller than when a single small flow path portion 45 is formed between the heat transfer tubes 31 closest to each other. This further increases the flow rate of the second fluid L that flows into the first small flow path portion 45A and the second small flow path portion 45B. Therefore, the second fluid L flows through the first small flow path portions 45A and the second small flow path portions 45B arranged in a staggered pattern, thereby further increasing the heat transfer efficiency of the second fluid L via the flow path forming portion 40A. As a result, the heat exchange efficiency between the first fluid H inside the heat transfer tube 31 and the second fluid L outside the heat transfer tube 31 can be further increased.

[0033] The flow path forming portion 40A includes a plurality of first convex portions 41 formed on the outer surface 32 of one heat transfer tube 31A and a plurality of second convex portions 42 formed on the outer surface 32 of the other heat transfer tube 31B. When viewed from the extending direction Da, the first convex portions 41 and the second convex portions 42 are arranged offset in the circumferential direction Dc. As a result, the first convex portions 41 and the second convex portions 42 can ensure a larger contact surface area where the second fluid L comes into contact with the flow path forming portion 40A, compared to when only one of the first convex portions 41 and the second convex portions 42 is formed. As a result, the heat exchange efficiency between the first fluid H inside the heat transfer tube 31 and the second fluid L outside the heat transfer tube 31 can be further improved.

[0034] Furthermore, when viewed from the extension direction Da, a portion of the tip 41s of the first convex portion 41 and a portion of the tip 42s of the second convex portion 42 that are adjacent in the circumferential direction Dc are connected. This allows the first small flow path portion 45A and the second small flow path portion 45B to be formed independently of each other. Therefore, the cross-sectional area when viewed from the extension direction Da can be made smaller than when the first small flow path portion 45A and the second small flow path portion 45B are connected. This further increases the flow rate of the second fluid L that flows into the first small flow path portion 45A and the second small flow path portion 45B.

[0035] (Modification of the first embodiment) In the first embodiment described above, when viewed from the extension direction Da, a portion of the tip 41s of the first convex portion 41 and a portion of the tip 42s of the second convex portion 42 adjacent to each other in the circumferential direction Dc are connected, but the structure of the flow path forming portion 40A is not limited to this structure.

[0036] For example, as shown in FIG. 6, when viewed from the extension direction Da, the flow path forming portion 40B of the heat exchanger 100B may be such that the first convex portion 41 and the second convex portion 42 adjacent to each other in the circumferential direction Dc are arranged with a gap in between in the circumferential direction Dc.

[0037] With this configuration, the first small flow passage portions 45A formed between the first convex portions 41 adjacent to each other in the circumferential direction Dc communicate with the second small flow passage portions 45B formed between the first convex portions 41 adjacent to each other in the circumferential direction Dc. Even with this configuration, the second fluid L passes through the multiple first small flow passage portions 45A and second small flow passage portions 45B, thereby improving the heat exchange efficiency of the second fluid L via the flow passage forming portion 40A. Furthermore, since the first convex portions 41 and the second convex portions 42 are independent, the first convex portions 41 and the second convex portions 42 are easier to form.

[0038] Second Embodiment Next, a second embodiment of the heat exchanger according to the present disclosure will be described. In the second embodiment described below, components common to the first embodiment will be denoted by the same reference numerals in the drawings and will not be described again. In the second embodiment, a portion of the configuration of the flow path forming portion 40C is different from that of the first embodiment.

[0039] As shown in FIG. 7, the flow path forming portion 40C of the heat exchanger 100C is formed so that the flow path cross-sectional area of ​​the small flow path portion 45, when viewed from the extension direction Da, is larger at a position closer to the discharge portion 22 in the extension direction Da than at a position closer to the supply portion 21 in the extension direction Da. The flow path forming portion 40C includes a first flow path region 48A and a second flow path region 48B. The first flow path region 48A is formed in a partial region on one side Da1 in the extension direction Da of the flow path forming portion 40C. The second flow path region 48B is formed in a partial region on the other side Da2 in the extension direction Da of the first flow path region 48A of the flow path forming portion 40C. The second flow path region 48B is formed so that the flow path cross-sectional area, when viewed from the extension direction Da, is larger than that of the first flow path region 48A.

[0040] 5, in the first flow path region 48A, a plurality of small flow path portions 45 are formed between the heat transfer tubes 31 that are closest to each other, similar to the flow path forming portion 40A in the first embodiment. That is, in the first flow path region 48A, a plurality of first convex portions 41 and a plurality of second convex portions 42 are arranged. As a result, the plurality of small flow path portions 45 include first small flow path portions 45A and second small flow path portions 45B.

[0041] Furthermore, at least some of the first convex portions 41 and the second convex portions 42 terminate at a position on one side Da1 in the extension direction Da relative to the second flow path region 48B. That is, at least some of the first convex portions 41 and the second convex portions 42 are not formed in the second flow path region 48B. Note that not all of the first convex portions 41 and the second convex portions 42 may be formed in the second flow path region 48B. As a result, in the second flow path region 48B, at least some of the small flow path portions 45 (first small flow path portion 45A and second small flow path portion 45B) formed in the first flow path region 48A merge together. Therefore, the flow path forming portion 40C is formed so that the flow path cross-sectional area is larger than that of the small flow path portion 45 when viewed from the extension direction Da at a position closer to the discharge portion 22 than at a position closer to the supply portion 21 in the extension direction Da.

[0042] In the heat exchanger 100C configured as described above, when the temperature of the first fluid H is higher than the temperature of the second fluid L, the second fluid L flowing between the heat transfer tubes 31 increases in temperature due to heat exchange with the first fluid H passing through the heat transfer tubes 31. As a result, the properties of the second fluid L change from liquid to gas. As a result, the density of the second fluid L decreases toward the discharge portion 22 in the extension direction Da, and the specific volume increases (expands). In contrast, in the flow path formation portion 40C of the second embodiment, the first flow path region 48A changes to the second flow path region 48B at a position close to the discharge portion 22. As a result, the flow path cross-sectional area of ​​the small flow path portion 45 can be increased in the second flow path region 48B when viewed from the extension direction Da. This allows the volume expansion of the second fluid L flowing from the first flow path region 48A to the second flow path region 48B, thereby increasing the flow velocity of the second fluid L in the second flow path region 48B. As a result, the efficiency of heat exchange between the first fluid H inside the heat transfer tubes 31 and the second fluid L outside the heat transfer tubes 31 can be increased.

[0043] The second flow path region 48B is formed by at least some of the small flow path sections 45 formed in the first flow path region 48A joining together, which makes it easy to form a structure in which the cross-sectional area of ​​the flow path is increased midway in the extension direction Da.

[0044] (Third embodiment) Next, a third embodiment of the heat exchanger according to the present disclosure will be described. In the third embodiment described below, components common to the first and second embodiments will be denoted by the same reference numerals in the drawings and will not be described again. In the third embodiment, the configuration of the flow path forming section 40D is different from the first and second embodiments.

[0045] As shown in FIG. 8, a core portion 30D of a heat exchanger 100D includes a plurality of heat transfer tubes 31D and a flow path forming portion 40D.

[0046] The cross-sectional area of ​​the flow path in each heat transfer tube 31D gradually increases from the other side Da2 toward one side in the extension direction Da. Therefore, the tube diameter (inner diameter and outer diameter) Ds of each heat transfer tube 31D gradually increases from the other side Da2 toward one side Da1 in the extension direction Da. That is, the heat transfer tube 31D is a tube member with a trapezoidal cross section, with one side Da1 being wider than the other side Da2 in the extension direction Da. Accordingly, the cross-sectional area of ​​the gap (where the flow path forming portion 40D is formed) between the heat transfer tubes 31D closest to each other in an imaginary plane perpendicular to the extension direction Da gradually increases from the one side Da1 toward the other side Da2 in the extension direction Da. In the third embodiment, this gap serves as the small flow path portion 45D. That is, the flow path forming portion 40D of the third embodiment also serves as the wall surface of the heat transfer tube 31D. As a result, the small flow path portions 45D have a flow path cross-sectional area that gradually increases as they approach the supply portion 21 from the discharge portion 22 in the extension direction Da.

[0047] According to this configuration, the small flow path portion 45D, which serves as the flow path for the second fluid L, has a flow path cross-sectional area that gradually increases from one side Da1 to the other side Da2 in the extension direction Da. This allows an increase in the volume of the second fluid L, and the flow velocity of the second fluid L can be gradually increased. As a result, the heat exchange efficiency between the first fluid H inside the heat transfer tube 31 and the second fluid L outside the heat transfer tube 31 can be improved.

[0048] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure.

[0049] In the above-described embodiments, the first small flow path portions 45A and the second small flow path portions 45B are arranged in a staggered pattern at different positions in both the opposing direction Dt and the circumferential direction Dc, but the small flow path portions 45 are not limited to this structure. There are no limitations on the arrangement of the small flow path portions 45, and by providing a plurality of small flow path portions 45 with narrowed flow path cross-sectional areas, it is possible to obtain the same effects as the above-described embodiments.

[0050] <Additional Notes> The heat exchangers 100A to 100D described in each embodiment can be understood, for example, as follows.

[0051] (1) A heat exchanger 100A to 100D according to a first aspect includes a piping body 11 forming a flow path 10r to which a first fluid H is supplied, a pair of partition plates 20 arranged at intervals in an extension direction Da of the piping body 11, blocking a part of the flow path 10r in the extension direction Da and defining a closed space Sc in a part of the flow path 10r, a plurality of heat transfer tubes 31, 31D having a tubular shape with both ends open, extending in the extension direction Da so as to penetrate the pair of partition plates 20, and arranged side by side at intervals, a supply unit 21 capable of supplying a second fluid L from the outside of the piping body 11 into the closed space Sc, and a heat transfer tube 31, 31D from the supply unit 21. The pipe main body 11 is provided with discharge sections 22 arranged at intervals in the extension direction Da and capable of discharging the second fluid L in the closed space Sc to the outside of the pipe main body 11, and flow path forming sections 40A to 40D that form a plurality of small flow path sections 45 between the heat transfer tubes 31, 31D that are closest to each other among the plurality of heat transfer tubes 31, 31D, wherein the second fluid L flows between the plurality of heat transfer tubes 31, 31D in the closed space Sc in a direction opposite to the flow direction of the first fluid H, and the plurality of small flow path sections 45 are arranged at different positions from each other when viewed from the position where the discharge section 22 is arranged in the extension direction Da.

[0052] In the heat exchangers 100A to 100D, when the second fluid L flows through the plurality of small flow path portions 45, the second fluid L flows in contact with the flow path forming portions 40A that form the inner surfaces of the respective small flow path portions 45. This ensures a large contact surface area between the heat transfer tubes 31 that are closest to each other and where the second fluid L comes into contact with the flow path forming portions 40A. Furthermore, the cross-sectional area of ​​each small flow path portion 45, as viewed from the extension direction Da, is smaller than the gap between the heat transfer tubes 31 that are closest to each other. This increases the flow rate of the second fluid L that flows into the small flow path portion 45. As a result, the heat transfer efficiency of the second fluid L flowing through the plurality of small flow path portions 45 is higher than when the second fluid L flows through the gap between the heat transfer tubes 31 that do not have the small flow path portions 45. This increases the heat exchange efficiency between the first fluid H in the heat transfer tubes 31 and the second fluid L outside the heat transfer tubes 31.

[0053] (2) Heat exchangers 100A to 100D according to the second aspect are the heat exchangers 100A to 100D of (1), and the flow path forming portions 40A to 40D form, as the small flow path portions 45, a first small flow path portion 45A arranged in a position close to one of the two heat transfer tubes 31, 31D that are adjacent to each other at the closest position, and a second small flow path portion 45B arranged in a position close to the other of the two heat transfer tubes 31, 31D that are adjacent to each other at the closest position, and arranged in a position shifted in the circumferential direction Dc of the heat transfer tubes 31, 31D relative to the first small flow path portion 45A when viewed from the extension direction Da.

[0054] As a result, the cross-sectional areas of the first small flow path portion 45A and the second small flow path portion 45B when viewed from the extending direction Da are smaller than when one small flow path portion 45 is formed between the heat transfer tubes 31 closest to each other. This further increases the flow rate of the second fluid L that flows into the first small flow path portion 45A and the second small flow path portion 45B. Therefore, by having the second fluid L flow through the first small flow path portion 45A and the second small flow path portion 45B, the heat transfer efficiency of the second fluid L via the flow path forming portion 40A is further improved. As a result, the heat exchange efficiency between the first fluid H inside the heat transfer tube 31 and the second fluid L outside the heat transfer tube 31 can be further improved.

[0055] (3) The heat exchangers 100A to 100D according to a third aspect are the heat exchangers 100A to 100D of (1) or (2), and the flow path forming portions 40A to 40D include a plurality of first convex portions 41 that protrude from the outer surface 32 of one of the two heat transfer tubes 31, the heat transfer tube 31A, toward the other heat transfer tube 31B, of the two heat transfer tubes 31 that are closest to each other, and extend in the extension direction Da, and are arranged at intervals in the circumferential direction Dc of the heat transfer tube 31, and a plurality of second convex portions 42 that protrude from the outer surface 32 of the other heat transfer tube 31 toward one of the heat transfer tubes 31, and extend in the extension direction Da, and are arranged at intervals in the circumferential direction Dc, and when viewed from the extension direction Da, the first convex portions 41 and the second convex portions 42 are arranged offset in the circumferential direction Dc.

[0056] This makes it possible to ensure a larger contact surface area where the second fluid L comes into contact with the flow path forming portion 40A by the first convex portions 41 and the second convex portions 42, compared to when only one of the first convex portions 41 and the second convex portions 42 is formed. As a result, the heat exchange efficiency between the first fluid H inside the heat transfer tube 31 and the second fluid L outside the heat transfer tube 31 can be further improved.

[0057] (4) The heat exchanger 100A according to the fourth aspect is the heat exchanger 100A of (3), in which, when viewed from the extension direction Da, a portion of the tip 41s of the first convex portion 41 and a portion of the tip 42s of the second convex portion 42 that are adjacent to each other in the circumferential direction Dc are connected.

[0058] This makes it possible to reduce the cross-sectional area when viewed from the extension direction Da compared to when the first small flow path portion 45A and the second small flow path portion 45B are connected, thereby further increasing the flow rate of the second fluid L that flows into the first small flow path portion 45A and the second small flow path portion 45B.

[0059] (5) The heat exchanger 100B according to the fifth aspect is the heat exchanger 100B of (3), in which, when viewed from the extension direction Da, the first convex portion 41 and the second convex portion 42 adjacent to each other in the circumferential direction Dc are arranged at an interval in the circumferential direction Dc.

[0060] Since the first convex portion 41 and the second convex portion 42 are independent from each other in this way, the first convex portion 41 and the second convex portion 42 can be easily formed.

[0061] (6) The heat exchanger 100C, 100D according to the sixth aspect is any one of the heat exchangers 100C, 100D of (1) to (5), in which the flow path forming portion 40C, 40D is formed so that the flow path cross-sectional area is larger than that of the small flow path portion 45 when viewed from the extension direction Da at a position closer to the discharge portion 22 than at a position closer to the supply portion 21 in the extension direction Da.

[0062] This makes it possible to increase the flow path cross-sectional area of ​​the small flow path portion 45 when viewed from the extension direction Da at a position close to the discharge portion 22. Therefore, volume expansion of the second fluid L that flows from the supply portion 21 toward the discharge portion 22 is permitted, and the flow velocity of the second fluid L can be increased at a position close to the discharge portion 22. As a result, the heat exchange efficiency between the first fluid H inside the heat transfer tube 31 and the second fluid L outside the heat transfer tube 31 can be improved.

[0063] (7) A heat exchanger 100C according to a seventh aspect is the heat exchanger 100C of (6), wherein the small flow passage portions 45 at least partially join together midway in the extension direction Da.

[0064] This makes it possible to easily form a structure in which the cross-sectional area of ​​the flow path is increased midway in the extension direction Da.

[0065] (8) The heat exchanger 100D according to the eighth aspect is the heat exchanger 100D of (6), wherein the small flow path sections 45D have a flow path cross-sectional area that gradually increases as viewed from the extension direction Da from the supply section 21 toward the discharge section 22.

[0066] This allows the volume of the second fluid L to increase, and gradually increases the flow rate of the second fluid L. As a result, the efficiency of heat exchange between the first fluid H inside the heat transfer tube 31 and the second fluid L outside the heat transfer tube 31 can be improved. [Explanation of symbols]

[0067] 10...Piping 10c...Bend 10r...flow path 11...Piping body 12...Elbow 13...Vane 20...Partition board 20A...First partition plate 20B...Second partition plate 21...Supply section 22...Discharge section 30A, 30D...Core part 30a...first end 30b...second end portion 30c…mid-section of the koa 31, 31A, 31B, 31D…heat pipes 31b…top 31c…Center axis 31t…top 32…External surface 38a, 38b…gap 40A~40D…Flow path forming part 41…First convex part 41s…Pioneer 42…Second convex part 42s…Apex 45, 45D…Small flow path 45A…First small flow path 45B…Second small flow path 48A…First flow path area 48B…Second flow path area 100A~100D…heat exchanger 211…Supply unit body 212…Supply port 221…Discharge unit body 222…Discharge outlet Da…extend in the direction Da1…one side Da2…the other side Dc…circumferential direction Dh…horizontal direction Ds…pipe diameter Dt…direction Dv...vertical direction H…First Fluid L…Second fluid Sc…closed space

Claims

1. a piping body forming a flow path to which a first fluid is supplied; a pair of partition plates arranged at an interval in the extension direction of the piping body, closing a part of the flow path in the extension direction, and defining a closed space in a part of the flow path; a plurality of heat transfer tubes each having a tubular shape with both ends open, extending in the extension direction so as to penetrate the pair of partition plates, and arranged side by side at intervals; a supply unit capable of supplying a second fluid into the closed space from the outside of the piping body; a discharge portion that is arranged at an interval from the supply portion in the extension direction and that is capable of discharging the second fluid in the closed space to the outside of the piping main body; a flow path forming portion that forms a plurality of small flow path portions between the heat transfer tubes that are closest to each other among the plurality of heat transfer tubes, the second fluid flows between the plurality of heat transfer tubes in the closed space in a direction opposite to a flow direction of the first fluid, the plurality of small flow path portions are arranged at different positions from each other when viewed from a position where the discharge portion is arranged in the extension direction, The flow path forming portion is configured as the small flow path portion, a first small flow path portion disposed at a position close to one of the two heat transfer tubes adjacent to each other at the closest position; a second small flow path portion that is disposed in a position close to the other of the two heat transfer tubes that are closest to each other and that is displaced in the circumferential direction of the heat transfer tube relative to the first small flow path portion when viewed from the extension direction, The first small flow path portions and the second small flow path portions are arranged in a staggered manner when viewed from the extending direction of the heat exchanger.

2. A piping body forming a flow path to which a first fluid is supplied; a pair of partition plates arranged at an interval in the extension direction of the piping body, closing a part of the flow path in the extension direction, and defining a closed space in a part of the flow path; a plurality of heat transfer tubes each having a tubular shape with both ends open, extending in the extension direction so as to penetrate the pair of partition plates, and arranged side by side at intervals; a supply unit capable of supplying a second fluid into the closed space from the outside of the piping body; a discharge portion that is arranged at an interval from the supply portion in the extension direction and that is capable of discharging the second fluid in the closed space to the outside of the piping main body; a flow path forming portion that forms a plurality of small flow path portions between the heat transfer tubes that are closest to each other among the plurality of heat transfer tubes, the second fluid flows between the plurality of heat transfer tubes in the closed space in a direction opposite to a flow direction of the first fluid, the plurality of small flow path portions are arranged at different positions from each other when viewed from a position where the discharge portion is arranged in the extension direction, The flow path forming portion is a plurality of first protrusions that protrude from an outer surface of one of the two heat transfer tubes that are closest to each other toward the other heat transfer tube and extend in the extension direction, and are arranged at intervals in the circumferential direction of the heat transfer tube; a plurality of second protrusions that protrude from an outer surface of the other heat transfer tube toward one of the heat transfer tubes in the extension direction and are arranged at intervals in the circumferential direction, When viewed from the extension direction, the first convex portion and the second convex portion are arranged to be shifted in the circumferential direction, A heat exchanger in which, when viewed from the extension direction, a portion of a tip of the first convex portion and a portion of a tip of the second convex portion that are adjacent to each other in the circumferential direction are connected.

3. The flow path forming portion is configured as the small flow path portion, a first small flow path portion disposed at a position close to one of the two heat transfer tubes adjacent to each other at the closest position; a second small flow path portion that is positioned close to the other of the two heat transfer tubes that are closest to each other and that is shifted circumferentially from the first small flow path portion when viewed from the extension direction.

4. The flow path forming portion is a plurality of first protrusions that protrude from an outer surface of one of the two heat transfer tubes that are closest to each other toward the other heat transfer tube and extend in the extension direction, and are arranged at intervals in the circumferential direction of the heat transfer tube; a plurality of second protrusions that protrude from an outer surface of the other heat transfer tube toward one of the heat transfer tubes in the extension direction and are arranged at intervals in the circumferential direction, The heat exchanger according to claim 1 , wherein the first convex portion and the second convex portion are arranged to be offset from each other in the circumferential direction when viewed from the extending direction.

5. The heat exchanger according to claim 4, wherein when viewed from the extension direction, a portion of a tip of each of the first convex portions and a portion of a tip of each of the second convex portions adjacent to each other in the circumferential direction are connected.

6. The heat exchanger according to claim 2 or 4, wherein when viewed from the extension direction, the first convex portion and the second convex portion adjacent to each other in the circumferential direction are arranged at an interval in the circumferential direction.

7. 7. A heat exchanger as described in any one of claims 1 to 6, wherein the flow path forming portion is formed so that the flow path cross-sectional area of ​​the small flow path portion when viewed from the extension direction is larger at a position closer to the discharge portion in the extension direction than at a position closer to the supply portion.

8. The heat exchanger according to claim 7 , wherein the plurality of small flow passage portions at least partially merge with each other midway in the extending direction.

9. The heat exchanger according to claim 7 , wherein the small flow passage sections have a flow passage cross-sectional area that gradually increases from the supply section to the discharge section in the extension direction.

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