Heat Exchanger

Abstract

To provide a heat exchanger which has a plurality of heat exchange tubes laminated, for actualizing accurate formation of spaces between the heat exchange tubes.SOLUTION: The heat exchanger includes a plurality of heat exchange tubes 20 laminated at spaces where first fluid F1 can pass, the heat exchange tubes 20 including an internal flow path 26 including a turn-around part 26a, where second fluid flows for heat exchange with the first fluid F1, a plurality of slits 46 provided between two flow path portions 26b of the internal flow path 26 each extending from the turn-around part 26a and opposing each other at a space, and a plurality of convex support part 40 contacting the other neighboring heat exchange tube 20 to form the space. In view from the laminated direction of the plurality of heat exchange tubes 20, at least one of the plurality of slits 46 extends in the state where the center in the extending direction deviates from a straight line connecting the two convex support parts 40 contacting each other.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Patent Document 1 discloses a heat exchanger in which multiple fin-shaped heat exchange tubes, each having an internal flow path through which water (fluid) flows, are stacked with gaps between them. In order to form gaps between the multiple heat exchange tubes through which air (fluid) to be exchanged with heat passes, each heat exchange tube is provided with multiple embossed portions that come into contact with the adjacent heat exchange tubes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6089172 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the case of a heat exchanger constructed by stacking a plurality of fin-shaped heat exchange tubes as described in Patent Document 1, it is necessary to form the gaps between the heat exchange tubes with high precision, otherwise variations in the flow resistance between the heat exchange tubes may occur, which may result in variations in the heat exchange rate of the heat exchanger.

[0005] Therefore, an object of the present disclosure is to form gaps between heat exchange tubes with high precision in a heat exchanger configured by stacking a plurality of heat exchange tubes. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, according to one aspect of the present disclosure, The heat exchanger includes a plurality of heat exchange tubes stacked with gaps therebetween that allow the first fluid to pass through, Each of the heat exchange tubes is an internal flow path through which a second fluid flows and which exchanges heat with the first fluid, the internal flow path including a turn-back portion; an inlet side connection portion communicating with the internal flow path and into which the second fluid flows; an outlet side connection portion communicating with the internal flow path and through which the second fluid flows out; a plurality of slits provided in a portion of the heat exchange tube between two flow path portions in the internal flow path that are spaced apart from each other and extend from the folded portion; a plurality of convex support portions that contact adjacent heat exchange tubes to form the gaps; A heat exchanger is provided in which, when viewed in the stacking direction of the heat exchange tubes, at least one of the slits extends with its center in the extension direction deviating from the straight line connecting two adjacent convex support portions. Effect of the Invention

[0007] According to the present disclosure, in a heat exchanger configured by stacking a plurality of heat exchange tubes, gaps between the heat exchange tubes can be formed with high precision. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view of a heat exchanger according to a first embodiment of the present disclosure; [Diagram 2] Partial cross-sectional view of the heat exchanger taken along line AA in FIG. [Diagram 3] FIG. 1 is a perspective view of a heat exchange tube of a heat exchanger according to a first embodiment; [Figure 4] 1 is a top view of a heat exchange tube according to a first embodiment. [Diagram 5] Cross-section of a heat exchanger tube along line BB in Figure 4 [Figure 6A] FIG. 1 is a diagram showing a simplified model of a heat exchanger tube of a comparative example provided with a slit and two protruding support portions. [Figure 6B] FIG. 1 shows a simplified model of a heat exchanger tube of a comparative example that has been twisted due to lamination. [Figure 7A] FIG. 1 shows a simplified model of a heat exchange tube according to an embodiment of the present invention. [Figure 7B] FIG. 1 shows a simplified model of a heat exchange tube of a preferred embodiment. [Figure 8] FIG. 11 is a cross-sectional view of a heat exchange tube of a heat exchanger according to a second embodiment of the present disclosure. [Figure 9] FIG. 13 is a perspective view of a heat exchange tube of a heat exchanger according to a third embodiment of the present disclosure. [Figure 10] 11 is a cross-sectional view of a heat exchanger tube according to a third embodiment. [Figure 11] FIG. 1 shows an example of an internal flow path of a heat exchange tube. [Figure 12] FIG. 1 shows another example of an internal flow path of a heat exchange tube. [Figure 13] 1 shows different examples of internal flow paths of a heat exchange tube. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A heat exchanger according to one embodiment of the present disclosure has a plurality of heat exchange tubes stacked with gaps therebetween through which a first fluid can pass, each of the heat exchange tubes having an internal flow path through which a second fluid that exchanges heat with the first fluid flows and including a turn-back portion, an inlet-side connection portion that is connected to the internal flow path and through which the second fluid flows, an outlet-side connection portion that is connected to the internal flow path and through which the second fluid flows out, a plurality of slits provided in a portion of the heat exchange tube between two flow path portions in the internal flow path that face each other at a distance, each extending from the turn-back portion, and a plurality of convex support portions that contact adjacent heat exchange tubes to form the gaps, and when viewed in the stacking direction of the plurality of heat exchange tubes, at least one of the plurality of slits extends with its center in the extension direction deviating from a straight line connecting two adjacent convex support portions.

[0010] According to this aspect, in a heat exchanger configured by stacking a plurality of heat exchange tubes, gaps between the heat exchange tubes can be formed with high precision.

[0011] For example, when viewed in the stacking direction, at least one of the plurality of slits may extend without intersecting a straight line connecting two adjacent convex support portions.

[0012] For example, the plurality of slits may extend away from the center line of the heat exchange tube passing between the inlet side connection portion and the outlet side connection portion when viewed in the stacking direction.

[0013] For example, the plurality of slits may be provided in the heat exchange tube symmetrically about a center line when viewed in the stacking direction.

[0014] For example, the heat exchange tube may include a cut-and-raised portion, and the slit may be a through-hole in the cut-and-raised portion.

[0015] For example, the cut-and-raised piece of the cut-and-raised portion may be a wall-like shape that stands on the downstream side of the through hole in the flow direction of the first fluid and is inclined toward the upstream side in the flow direction.

[0016] For example, the cut-and-raised piece in the cut-and-raised portion may be in the shape of a bridge extending in a direction perpendicular to the flow direction of the first fluid.

[0017] For example, the inlet side connection portion and the outlet side connection portion may be adjacent to each other, and a through hole may be provided in a portion of the heat exchange tube between the inlet side connection portion and the outlet side connection portion as viewed in the stacking direction.

[0018] For example, the inlet side connection portion and the outlet side connection portion may be aligned in a flow direction of the first fluid.

[0019] For example, the inlet side connection portion may be located downstream in the flow direction of the first fluid, and the outlet side connection portion may be located upstream.

[0020] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0021] (Embodiment 1) Fig. 1 is a front view of a heat exchanger according to the first embodiment. Fig. 2 is a partial cross-sectional view of the heat exchanger taken along line AA in Fig. 1. Note that the XYZ orthogonal coordinate system shown in the figure is for facilitating understanding of the present disclosure and does not limit the embodiments of the present disclosure. The X-axis direction indicates the short-side direction of the heat exchange tube, the Y-axis direction indicates the long-side direction of the heat exchange tube, and the Z-axis direction indicates the stacking direction of multiple heat exchange tubes.

[0022] 1 is used in the refrigeration cycle of an air conditioner or a refrigerator, or in a cooling device for a device that operates with heat generation. Specifically, in the case of the first embodiment, the heat exchanger 10 is a device for heating or cooling a fluid (second fluid) F2 such as water or a hydrofluorocarbon by using a fluid (first fluid) F1 such as air.

[0023] As shown in FIGS. 1 and 2, the heat exchanger 10 has a plurality of heat exchange tubes 20 stacked with gaps therebetween that allow a first fluid F1 to pass through, and a housing 22 that supports the heat exchange tubes 20.

[0024] Fig. 3 is a perspective view of a heat exchange tube of the heat exchanger according to embodiment 1. Fig. 4 is a top view of the heat exchange tube of the heat exchanger according to embodiment 1. Fig. 5 is a cross-sectional view of the heat exchange tube taken along line BB in Fig. 4. Fig. 5 shows a state in which two heat exchange tubes are stacked.

[0025] As shown in FIGS. 3 and 4, the heat exchange tube 20 is a generally thin plate-like, so-called fin-like member, which exchanges heat with the first fluid F1.

[0026] As shown in FIG. 5, the heat exchange tube 20 is made by joining two press-molded thin metal plates 20A and 20B together. In the case of the first embodiment, the thin metal plates 20A and 20B used in the heat exchange tube 20 are aluminum substrates having a thickness of 0.2 mm, that is, so-called clad plates, on both sides of which brazing material layers such as aluminum-silicon alloy are formed. The two thin metal plates 20A and 20B are each formed with embossed portions 20a and 20b by press molding. The two thin metal plates 20A and 20B are joined together with the embossed portions 20a and 20b facing each other, thereby forming the internal flow path 26 of the heat exchange tube 20. The heat exchange tube 20 may be made of a clad material in which brazing material layers such as copper or nickel are formed on both sides of a stainless steel substrate, or may be made of a copper substrate to which brazing material is bonded or plated on both sides.

[0027] As shown in FIG. 3 to FIG. 5, the heat exchange tube 20 includes a cylindrical inlet side connection part 28 communicating with the internal flow path 26 and through which the second fluid F2 flows in, and a cylindrical outlet side connection part 30 communicating with the internal flow path 26 and through which the second fluid F2 flows out. In the case of the first embodiment, the inlet side connection part 28 and the outlet side connection part 30 are arranged in the center of the longitudinal direction (Y axis direction) of the heat exchange tube 20, lined up in the short side direction (X axis direction). When a plurality of heat exchange tubes 20 are stacked, the inlet side connection parts 28 of the plurality of heat exchange tubes 20 are connected in the stacking direction (Z axis direction), and the outlet side connection parts 30 are connected in the stacking direction. The inlet side connection parts 28 and the outlet side connection parts 30 are joined by heating, for example, brazing. By connecting the plurality of inlet side connection parts 28, an inlet side manifold flow path 32 that distributes the second fluid F2 to the internal flow paths 26 of each heat exchange tube 20 is formed, as shown in FIG. 2. Furthermore, by connecting the multiple outlet connection parts 30, an outlet manifold flow path 34 is formed in which the second fluid F2 from the internal flow paths 26 of the heat exchange tubes 20 join together.

[0028] It is preferable that the inlet side connecting portion 28 and the outlet side connecting portion 30 are aligned in the flow direction (X-axis direction) of the first fluid F1, i.e., overlap in the flow direction, as in the present embodiment 1. This makes it possible to reduce the flow resistance of the first fluid F1 flowing through the gaps S between the heat exchange tubes 20, compared to a case in which they are not aligned in the flow direction.

[0029] In addition, in consideration of the heat exchange rate between the first fluid F1 and the second fluid F2, it is preferable that the inlet side connection part 28 is located downstream in the flow direction (X-axis direction) of the first fluid F1, and the outlet side connection part 30 is located upstream in the flow direction of the first fluid F1. As shown in FIG. 3, the second fluid F2 flowing from the inlet side connection part 28 to the outlet side connection part 30 through the internal flow path 26 flows in the opposite direction to the flow direction of the first fluid F1 when viewed in the stacking direction (Z-axis direction) of the heat exchange tube 20. As a result, the flow of the second fluid F2 can be regarded as a counterflow to the flow of the first fluid F1. As a result, the heat exchange rate between the first and second fluids F1 and F2 is improved compared to when the first and second fluids F1 and F2 flow in the same direction when viewed in the stacking direction, that is, when the inlet side connection part 28 is located upstream in the flow direction of the first fluid F1 and the outlet side connection part 30 is located downstream.

[0030] 1 and 2, a plurality of heat exchange tubes 20 in a stacked state are housed in a housing 22. The housing 22 is tubular and open in the short-side direction (X-axis direction) of the heat exchange tubes 20, so that the flow direction of the first fluid F1 is restricted to the short-side direction of the heat exchange tubes 20.

[0031] In the first embodiment, the housing 22 includes a top plate portion 22a, a bottom plate portion 22b, and a side wall portion 22c connecting the top plate portion 22a and the bottom plate portion 22b. The top plate portion 22a, the heat exchange tubes 20, and the bottom plate portion 22b are heated and joined together in a stacked state to produce a stacked body. Thereafter, the side wall portion 22c is fixed to the top plate portion 22a and the bottom plate portion 22b of the stacked body with screws or the like to produce the heat exchanger 10.

[0032] The housing 22 also includes an inlet port 36 communicating with the inlet manifold channel 32 and an outlet port 38 communicating with the outlet manifold channel 34. The second fluid F2 enters the inlet manifold channel 32 through the inlet port 32, and enters the internal channels 26 of the heat exchange tubes 20 from the inlet manifold channel 32. The second fluid F2 in the internal channels 26 of the heat exchange tubes 20 join together at the outlet manifold channel 34, and flows out of the heat exchanger 10 through the outlet port 38.

[0033] 5, the heat exchange tubes 20 are stacked with a gap S therebetween through which the first fluid F1 can pass. To form and maintain the gap S, each heat exchange tube 20 has a plurality of convex support parts 40, 42 on both sides in the stacking direction (Z-axis direction). The plurality of convex support parts 40 are provided on one surface (thin metal plate 20A) of the heat exchange tube 20, and the plurality of convex support parts 42 are provided on the other surface (thin metal plate 20B). When viewed in the stacking direction (Z-axis direction) of the heat exchange tubes 20, the positions of the plurality of convex support parts 40 and the positions of the plurality of convex support parts 42 coincide with each other.

[0034] The multiple convex support portions 42 of the heat exchange tube 20 and the multiple convex support portions 44 of the adjacent heat exchange tube 20 come into contact with each other and support each other, forming a gap S through which the first fluid F1 can pass between the two heat exchange tubes 20. The convex support portions 42 and 44 are joined by heating, for example, brazing.

[0035] As shown in FIG. 4, in the case of the first embodiment, the internal flow path 26 of the heat exchange tube 20 has a shape symmetrical about a center line C1 extending in the short-side direction (X-axis direction) of the heat exchange tube 20 and a center line C2 extending in the longitudinal direction (Y-axis direction) of the heat exchange tube 20 when viewed in the stacking direction (Z-axis direction). Specifically, the internal flow path 26 is composed of an approximately "M"-shaped flow path 26L extending from the inlet side connecting portion 28 toward the outlet side connecting portion 30 and disposed on one side in the longitudinal direction of the heat exchange tube 20, and an approximately "M"-shaped flow path 26R extending from the inlet side connecting portion 28 toward the outlet side connecting portion 30 and disposed on the other side in the longitudinal direction. As a result, the internal flow path 26 includes a plurality of turn-back portions 26a at which the flow direction of the second fluid F2 changes by 180 degrees. By including such a plurality of turn-back portions 26a in the internal flow path 26, the heat exchange rate between the second fluid F2 flowing in the internal flow path 26 and the first fluid F1 flowing on the heat exchange tube 20 is improved.

[0036] 4, the heat exchange tube 20 is provided with a plurality of slits 46. Specifically, the plurality of slits 46 are formed in a portion of the heat exchange tube 20 between two flow path portions 26b in the internal flow paths 26 that extend from the folded-back portion 26a and face each other with a gap therebetween. In the case of the first embodiment, the slits 46 are elongated holes that extend in the extension direction (Y-axis direction) of the linear flow path portions 26b and penetrate the heat exchange tube 20. The slits 46 are formed in the heat exchange tube 20 by, for example, punching.

[0037] The slits 46 are provided to suppress heat exchange between the second fluid F2 flowing through each of the two flow path portions 26b extending from the turning portion 26a. That is, the slits 46 suppress heat transfer from the second fluid F2 in one flow path portion 26b to the second fluid F2 in the other flow path portion 26b through the heat exchange tube 20. In other words, the slits 46 suppress a thermal shortcut. If such a thermal shortcut occurs, the heat exchange rate between the first and second fluids F1 and F2 decreases, so the slits 46 are provided as a countermeasure against this.

[0038] Although the slits 46 can suppress the shortcut of heat, the heat exchange tube 20 is more likely to deform than if there were no slits. Therefore, the multiple slits 46 are provided at appropriate positions so that the deformation of the heat exchange tube 20 can be suppressed.

[0039] 4, when viewed in the stacking direction (Z-axis direction) of the heat exchange tubes 20, at least one slit 46 is provided in the heat exchange tube 20 such that the center of the slit 46 in the extension direction (Y-axis direction) is off the straight line connecting two adjacent protruding support portions 40. The reason for this will be explained.

[0040] Fig. 6A shows a simplified model of a heat exchanger tube of a comparative example having a slit and two protruding support portions, and Fig. 6B shows a simplified model of a heat exchanger tube of a comparative example that is twisted and deformed due to lamination.

[0041] As shown in FIG. 6A, when the center CS of the slit 146 in the extension direction (Y-axis direction) is located on a straight line VL connecting two adjacent convex support portions 140, for example, two adjacent convex support portions 140 that are adjacent to each other at the shortest distance, the heat exchanger tube 120 of the comparative example becomes easily deformed.

[0042] As described above, the heat exchange tubes 120 of the comparative examples are stacked while being supported by each other via the respective convex supporting portions 140, 142. However, when the allowable manufacturing error of each heat exchange tube 120 (e.g., the height error of the convex supporting portions 140, 142) and the allowable assembly error of the multiple heat exchange tubes 120 accumulate, deformation of a certain heat exchange tube 120 may occur.

[0043] For example, due to accumulation of errors, as shown in FIG. 6B, a twisting deformation may occur in the heat exchange tube 120 such that the positions (height positions) of two adjacent protruding support parts 140 in the stacking direction (Z-axis direction) are different. This occurs because the two protruding support parts 140 are not constrained to each other by the slits 146 and are easily shifted relative to each other in the stacking direction. When such a twisting deformation occurs, the size of the gap between the heat exchange tubes 120 varies, which may cause a variation in the flow resistance of the first fluid passing through the gap. As a result, a variation in the heat exchange rate of the heat exchanger may occur.

[0044] 6A, such torsional deformation is likely to occur when the center CS of the slit 146 in the extension direction (Y-axis direction) is located on a straight line VL connecting two adjacent convex support parts 140. In addition, the greater the length of the slit 146, the greater the deformation amount of the heat exchanger tube 120.

[0045] Therefore, in the case of this embodiment 1, as shown in Figure 4, when viewed in the stacking direction (Z-axis direction) of the multiple heat exchange tubes 20, at least one slit 46 is provided in the heat exchange tube 20 such that the center of the slit 46 in the extension direction (Y-axis direction) is off the straight line connecting two adjacent convex support portions 40.

[0046] Figure 7A shows a simplified model of a heat exchange tube of an embodiment, and Figure 7B shows a simplified model of a heat exchange tube of a preferred embodiment.

[0047] 7A, when viewed in the stacking direction (Z-axis direction) of the heat exchange tubes 20, the center CS in the extension direction (Y-axis direction) of the slits 46 is off the straight line VL connecting two adjacent convex support portions 40. As a result, deformation caused by stacking of the heat exchange tubes 20 is suppressed compared to the heat exchange tube 120 of the comparative example shown in FIG. 6A, in which the center CL is located on the straight line VL.

[0048] It should be noted that as the straight line VL connecting two adjacent protruding support portions 40 moves away from the center CS of the slit 46 and approaches both ends of the slit 46, the deformation of the heat exchange tube 20 is more effectively suppressed.

[0049] In the heat exchange tube 20 of the preferred embodiment shown in Fig. 7B, when viewed in the stacking direction (Z-axis direction) of the heat exchange tubes 20, the slit 46 extends without intersecting with the straight line VL connecting two adjacent convex support portions 40. As a result, the two convex support portions 40 are less likely to shift relative to each other in the stacking direction because there is no slit 46 between them. As a result, the heat exchange tube 20 shown in Fig. 7B is more resistant to deformation than the heat exchange tube 20 of the embodiment shown in Fig. 7A.

[0050] In order to suppress deformation of the heat exchange tube 20, in addition to being positioned relative to the multiple convex support portions 40 (42), in the case of this embodiment 1, the slits 46 are provided in the heat exchange tube 20 taking the following into consideration.

[0051] 4, in the case of the first embodiment, the multiple slits 46 are provided in the heat exchange tube 20 so as to extend away from the center line C2 extending in the longitudinal direction (Y-axis direction) of the heat exchange tube 20. That is, the multiple slits 46 are provided in the heat exchange tube 20 so as to extend away from the center line C2 passing between the inlet side connecting portion 28 and the outlet side connecting portion 30. This prevents a certain heat exchange tube 20 from bending along the center line C2 when multiple heat exchange tubes 20 are stacked.

[0052] Specifically, there is an allowable error in the size in the stacking direction (Z-axis direction) between the inlet side connection part 28 and the outlet side connection part 30 of each heat exchange tube 20. When a plurality of heat exchange tubes 20 are stacked and the error accumulates, bending stress occurs between the inlet side connection part 28 and the outlet side connection part 30 in a certain heat exchange tube 20. At this time, if a plurality of slits 46 extend on the center line C2 of the heat exchange tube 20 passing between the inlet side connection part 28 and the outlet side connection part 30, there is a possibility that the heat exchange tube 20 will bend along the center line C2.

[0053] Therefore, as shown in FIG. 4, the multiple slits 46 are provided in the heat exchange tube 20 away from the center line C2 passing between the inlet side connecting portion 28 and the outlet side connecting portion 30.

[0054] 4, in the case of the first embodiment, the slits 46 are arranged symmetrically with respect to the two center lines C1 and C2 of the heat exchange tubes 20 when viewed in the stacking direction (Z-axis direction) of the heat exchange tubes 20. This makes the rigidity of the heat exchange tubes 20 uniform, and suppresses deformation of the heat exchange tubes 20.

[0055] In the case of the first embodiment, the heat exchange tube 20 includes components other than the slits 46 as components for suppressing the shortcut of heat.

[0056] 4, when viewed in the stacking direction (Z-axis direction) of the heat exchange tubes 20, the inlet side connection part 28 and the outlet side connection part 30 are adjacent to each other at a close distance without there being any internal flow path 26 therebetween. A through hole 48 that suppresses heat transfer between the second fluid F2 flowing through the inlet side connection part 28 and the second fluid F2 flowing through the outlet side connection part 30 is provided in the part of the heat exchange tube 20 therebetween.

[0057] Specifically, in the heat exchange tube 20, the temperature difference between the second fluid F2 flowing through the inlet side connecting portion 28 and the second fluid F2 flowing through the outlet side connecting portion 30 is the largest. Therefore, when the inlet side connecting portion 28 and the outlet side connecting portion 30 are adjacent to each other, a large amount of heat shortcut may occur between them. In order to suppress this heat shortcut, the through hole 48 is provided.

[0058] Furthermore, in the case of this embodiment 1, as shown in Figure 4, when viewed in the stacking direction (Z-axis direction) of the multiple heat exchange tubes 20, a portion of the heat exchange tube 20 between the inlet side connection portion 28 and the internal flow path 26 and a portion of the heat exchange tube 20 between the outlet side connection portion 30 and the internal flow path 26 are also provided with through holes 50 to suppress thermal shortcuts between them.

[0059] According to the first embodiment as described above, in a heat exchanger configured by stacking a plurality of heat exchange tubes, gaps between the heat exchange tubes can be formed with high precision.

[0060] (Embodiment 2) In the case of the above-mentioned first embodiment, as shown in Fig. 5, the slit 46 is a through-hole formed by removing a part of the heat exchange tube 20 by, for example, punching. In the present embodiment 2, the method of forming the slit is different from that of the above-mentioned first embodiment. The present embodiment 2 will be described focusing on this difference.

[0061] Fig. 8 is a cross-sectional view of a heat exchange tube of a heat exchanger according to embodiment 2. Note that Fig. 8 shows a state in which two heat exchange tubes are stacked.

[0062] 8, the slit 252b is also provided in the heat exchange tube 220 for the same reason as the slit 46 of the heat exchange tube 20 of the above-mentioned embodiment 1. However, the slit 252b in the embodiment 2 is configured as a part of the cut-and-raised portion 252.

[0063] The cut-and-raised portion 252 is composed of, for example, a cut-and-raised piece 252a formed by forming a bracket-shaped cut in the heat exchange tube 220 and standing up the portion surrounded by the cut, and a through hole formed by standing up the cut-and-raised piece 252a. The through hole in the cut-and-raised portion 252 functions as a slit 252b that suppresses a shortcut of heat between the second fluid F2 flowing through different parts of the internal flow path 226 (parts extending from the turning back part and facing each other).

[0064] In the case of the second embodiment, the cut-and-raised piece 252a of the cut-and-raised portion 252 stands on the downstream side of the flow direction of the first fluid F1 with respect to the slit 252b (through hole) and is in the shape of a wall inclined toward the upstream side of the flow direction. Therefore, the cut-and-raised piece 252a functions as a wind direction plate for the first fluid F1. Specifically, the cut-and-raised piece 252a guides the first fluid F1 into the slit 252b. As a result, the first fluid F1 flows into different gaps S of the heat exchange tube 20. As a result, the first fluid F1 flows in a complex manner inside the heat exchanger, and the heat exchange rate between the first fluid F1 and the second fluid F2 is improved compared to the first embodiment described above.

[0065] In the second embodiment, similarly to the first embodiment described above, in a heat exchanger formed by stacking a plurality of heat exchange tubes, gaps between the heat exchange tubes can be formed with high precision.

[0066] (Embodiment 3) The present embodiment 3 is an improved version of the above-mentioned embodiment 2. Specifically, the shape of the raised piece in the raised portion is different.

[0067] Fig. 9 is a perspective view of a heat exchange tube according to the embodiment 3. Fig. 10 is a cross-sectional view of the heat exchange tube of the heat exchanger according to the embodiment 3. Fig. 10 shows a state in which two heat exchange tubes are stacked.

[0068] 9 and 10, the heat exchange tube 320 of the heat exchanger according to the third embodiment also includes a cut-and-raised portion 352, similar to the heat exchange tube 220 of the second embodiment. In the case of the third embodiment, the cut-and-raised piece 352a of the cut-and-raised portion 352 is in a bridge shape extending in a direction perpendicular to the flow direction of the first fluid F1. The through hole 352b of the cut-and-raised portion 352 functions as a slit that suppresses a shortcut of heat between the second fluid F2 flowing through different parts of the internal flow path 326 (parts extending from the turning portion and facing each other).

[0069] 10, the first fluid F1 is divided into upper and lower flows by the bridge-shaped cut-and-raised piece 352a. As a result, the first fluid F1 flows in a more complex manner inside the heat exchanger than in the second embodiment, and the heat exchange rate between the first fluid F1 and the second fluid F2 is further improved.

[0070] In the third embodiment, similarly to the first embodiment described above, in a heat exchanger formed by stacking a plurality of heat exchange tubes, gaps between the heat exchange tubes can be formed with high precision.

[0071] Although the present disclosure has been described above with reference to the above-mentioned first to third embodiments, the embodiments of the present disclosure are not limited to the above-mentioned embodiments.

[0072] 4, in the case of the above-mentioned first embodiment, the internal flow passage 26 of the heat exchange tube 20 has a shape symmetrical about a center line C1 extending in the short direction (X-axis direction) and a center line C2 extending in the longitudinal direction (Y-axis direction) when viewed in the stacking direction (Z-axis direction) of the heat exchange tubes 20. Specifically, the internal flow passage 26 is composed of a substantially "M"-shaped flow passage 26L arranged on one side in the longitudinal direction of the heat exchange tube 20 and a substantially "M"-shaped flow passage 26R arranged on the other side in the longitudinal direction.

[0073] However, the shape of the internal flow passage of the heat exchange tube in the heat exchanger according to the embodiment of the present disclosure is not limited to this.

[0074] 11, 12 and 13 are diagrams showing various examples of internal flow paths of a heat exchange tube.

[0075] In the case of the heat exchange tube 420 shown in FIG. 11, the internal flow path 426 has a shape symmetrical about a center line C1 extending in the short direction (X-axis direction) and a center line C2 extending in the longitudinal direction (Y-axis direction) when viewed in the stacking direction (Z-axis direction) of the heat exchange tube 420. Specifically, the internal flow path 426 is composed of a substantially "U"-shaped flow path 426L extending from the inlet side connecting portion 428 toward the outlet side connecting portion 430 and disposed on one side in the longitudinal direction of the heat exchange tube 20, and a substantially "U"-shaped flow path 426R extending from the inlet side connecting portion 428 toward the outlet side connecting portion 430 and disposed on the other side in the longitudinal direction. As a result, the internal flow path 426 includes two folded portions 426a and flow path portions 426b extending from the folded portions 426a and facing each other with a gap therebetween. A plurality of slits 446 are provided in the portion of the heat exchange tube 420 between the flow path portions 426b.

[0076] In the case of the heat exchange tube 520 shown in FIG. 12, the internal flow path 526 has a shape symmetrical with respect to a center line C2 extending in the longitudinal direction (Y-axis direction) when viewed in the stacking direction (Z-axis direction) of the heat exchange tube 520. However, the shape of the internal flow path 526 is not a shape symmetrical with respect to a center line C1 extending in the lateral direction (X-axis direction). This is because the inlet side connection part 528 and the outlet side connection part 530 are arranged side by side in the lateral direction at one end in the longitudinal direction, not at the center of the heat exchange tube 520 in the longitudinal direction. The internal flow path 526 extends from the inlet side connection part 528 toward the outlet side connection part 530 and has a substantially "M" shape. As a result, the internal flow path 526 includes three folded parts 526a and flow path parts 526b extending from the folded parts 526a and facing each other with a gap therebetween. A plurality of slits 546 are provided in the part of the heat exchange tube 520 between the flow path parts 526b. The multiple slits 546 are provided off the center line C2.

[0077] In the case of the heat exchange tube 620 shown in FIG. 13, the shape of the internal flow path 626 is not symmetrical with respect to a center line C1 extending in the short direction (X-axis direction) and a center line C2 extending in the longitudinal direction (Y-axis direction) when viewed in the stacking direction (Z-axis direction) of the heat exchange tube 520. This is because the inlet side connection part 628 and the outlet side connection part 630 are arranged on a diagonal line of the heat exchange tube 620. Therefore, the internal flow path 626 extends from the inlet side connection part 628 to the outlet side connection part 630 and has an inverted S-shape. As a result, the internal flow path 626 includes two folded parts 626a and flow path parts 626b extending from the folded parts 626a and facing each other with a gap therebetween. A plurality of slits 646 are provided in the part of the heat exchange tube 620 between the flow path parts 626b.

[0078] In this way, the shape of the internal flow path of the heat exchanger and the positions of the inlet-side connection part and the outlet-side connection part can be changed in various ways depending on the application. The internal flow path of the heat exchange tube in the heat exchanger according to the embodiment of the present disclosure may be a flow path including at least one folded part. That is, the heat exchange tube in the heat exchanger according to the embodiment of the present disclosure is a heat exchange tube in which two flow path parts facing each other with a gap therebetween are generated by one folded part, and a slit is provided in the part of the heat exchange tube between the two flow path parts.

[0079] In the case of the above-mentioned first embodiment, as shown in Fig. 3, the first fluid F1 exchanged by the heat exchanger 10 flows in the short-side direction (X-axis direction) of the heat exchange tube 20. However, the embodiment of the present disclosure is not limited to this. The heat exchanger may be configured so that the first fluid flows in the longitudinal direction of the heat exchange tube.

[0080] That is, in a broad sense, a heat exchanger according to an embodiment of the present disclosure has a plurality of heat exchange tubes stacked with gaps therebetween through which a first fluid can pass, each of the heat exchange tubes having an internal flow path through which a second fluid that exchanges heat with the first fluid flows and including a turn-back portion, an inlet side connection portion that is connected to the internal flow path and through which the second fluid flows, an outlet side connection portion that is connected to the internal flow path and through which the second fluid flows out, a plurality of slits provided in a portion of the heat exchange tube between two flow path portions in the internal flow path that face each other at a distance, each extending from the turn-back portion, and a plurality of convex support portions that contact adjacent heat exchange tubes to form the gaps, and when viewed in the stacking direction of the plurality of heat exchange tubes, at least one of the plurality of slits extends with its center in the extension direction deviating from the straight line connecting two adjacent convex support portions.

[0081] As described above, the above-mentioned embodiment has been described as an example of the technology in the present disclosure. For this purpose, drawings and detailed description are provided. Therefore, among the components described in the drawings and detailed description, not only components essential for solving the problem but also components that are not essential for solving the problem in order to illustrate the above-mentioned technology may be included. Therefore, the fact that these non-essential components are described in the drawings or detailed description should not be used to immediately determine that these non-essential components are essential.

[0082] Furthermore, since the above-described embodiments are intended to illustrate the technology in the present disclosure, various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0083] The present disclosure is applicable to a heat exchanger configured by stacking a plurality of fin-shaped heat exchange tubes. [Explanation of symbols]

[0084] 20 Heat exchange tube 26 Internal flow path 26a Folded part 26b Flow path section 40 Convex support part 46 Slit F1 First Fluid

Claims

1. The heat exchanger includes a plurality of heat exchange tubes stacked with gaps therebetween that allow the first fluid to pass through, Each of the heat exchange tubes is an internal flow path through which a second fluid flows and which exchanges heat with the first fluid, the internal flow path including a turn portion; an inlet side connection portion communicating with the internal flow path and into which the second fluid flows; an outlet side connection portion communicating with the internal flow path and through which the second fluid flows out; a plurality of slits provided in a portion of the heat exchange tube between two flow path portions in the internal flow path that are spaced apart from each other and extend from the folded portion; a plurality of convex support portions that are located on the two flow path portions of the internal flow path when viewed in a stacking direction that is the stacking direction, and that contact other adjacent heat exchange tubes to form the gap; A heat exchanger in which, when viewed in the stacking direction, at least one of the plurality of slits extends with its center in the extension direction deviating from a straight line connecting two adjacent convex support portions.

2. The heat exchanger according to claim 1 , wherein at least one of the plurality of slits extends without intersecting a straight line connecting two adjacent ones of the convex support portions when viewed in the stacking direction.

3. 3. The heat exchanger according to claim 1, wherein the plurality of slits extend away from a center line of the heat exchange tube passing between the inlet side connection portion and the outlet side connection portion when viewed in the stacking direction.

4. The heat exchanger according to claim 1 , wherein the plurality of slits are provided in the heat exchange tube symmetrically about a center line when viewed in the stacking direction.

5. The heat exchange tube has a cut-and-raised portion, The heat exchanger according to claim 1 , wherein the slit is a through hole in the cut-and-raised portion.

6. The heat exchanger according to claim 5 , wherein the cut-and-raised piece of the cut-and-raised portion is a wall-like member that stands on a downstream side of the through hole in a flow direction of the first fluid and is inclined upstream in the flow direction.

7. The heat exchanger according to claim 5 , wherein the cut-and-raised pieces in the cut-and-raised portions are bridge-shaped and extend in a direction perpendicular to the flow direction of the first fluid.

8. The inlet side connection portion and the outlet side connection portion are adjacent to each other, The heat exchanger according to claim 1 , wherein a through hole is provided in a portion of the heat exchange tube between the inlet side connection portion and the outlet side connection portion as viewed in the stacking direction.

9. The heat exchanger according to claim 1 , wherein the inlet side connection portion and the outlet side connection portion are aligned in a flow direction of the first fluid.

10. The heat exchanger according to claim 9 , wherein the inlet side connection portion is located downstream in a flow direction of the first fluid, and the outlet side connection portion is located upstream.

Images