JP2022070491A - Heat exchanger - Google Patents

Abstract

A heat exchanger configured by stacking a plurality of heat exchange tubes, in which gaps between the heat exchange tubes are formed with high accuracy. A heat exchanger has a plurality of heat exchange tubes (20) stacked with a gap through which a first fluid (F1) can pass. In the heat exchange tube 20, a second fluid that exchanges heat with the first fluid F1 flows, and an internal flow path 26 including a folded portion 26a extends from the folded portion 26a and faces each other with a gap. A plurality of slits 46 provided between two flow path portions 26b in the internal flow path 26, and a plurality of convex support portions 40 contacting other adjacent heat exchange tubes 20 to form gaps. . When viewed in the stacking direction of the plurality of heat exchange tubes 20, at least one of the plurality of slits 46 extends in a state where the center in the extending direction is off the straight line connecting two adjacent convex support portions 40. . [Selection drawing] Fig. 3

Description

The present disclosure relates to heat exchangers.

Patent Document 1 discloses a heat exchanger in which a plurality of fin-shaped heat exchange tubes provided with an internal flow path through which water (fluid) flows are laminated with a gap. In order to form a gap through which the air (fluid) to be heat exchange passes between the plurality of heat exchange tubes, each heat exchange tube is provided with a plurality of embossed portions that come into contact with other adjacent heat exchange tubes. ing.

Patent No. 6089172

By the way, in the case of a heat exchanger configured by stacking a plurality of fin-shaped heat exchange tubes as described in Patent Document 1, it is necessary to accurately form a gap between the heat exchange tubes. Otherwise, the flow path resistance between the heat exchange tubes may vary, resulting in variations in the heat exchange rate of the heat exchanger.

Therefore, it is an object of the present disclosure to accurately form a gap between heat exchange tubes in a heat exchanger configured by stacking a plurality of heat exchange tubes.

In order to solve the above-mentioned problems, according to one aspect of the present disclosure,
It has a plurality of heat exchange tubes laminated with a gap through which the first fluid can pass.
Each of the heat exchange tubes
A second fluid that exchanges heat with the first fluid flows, and has an internal flow path including a folded portion and an internal flow path.
An inflow side connection portion that communicates with the internal flow path and into which the second fluid flows,
An outflow side connection portion that communicates with the internal flow path and allows the second fluid to flow out.
A plurality of slits provided in the heat exchange tube portion between the two flow path portions in the internal flow path extending from the folded portion and facing each other at intervals, and a plurality of slits.
It comprises a plurality of convex supports, which are in contact with other adjacent heat exchange tubes to form the gap.
In the stacking direction view of the plurality of heat exchange tubes, at least one of the plurality of slits extends in a state where the center in the extending direction is off the straight line connecting the two adjacent convex supports portions. , A heat exchanger is provided.

According to the present disclosure, in a heat exchanger configured by stacking a plurality of heat exchange tubes, it is possible to accurately form a gap between the heat exchange tubes.

Front view of the heat exchanger according to the first embodiment of the present disclosure. Partial cross-sectional view of the heat exchanger along line AA of FIG. Perspective view of the heat exchange tube of the heat exchanger according to the first embodiment. Top view of the heat exchange tube according to the first embodiment Sectional drawing of the heat exchange tube along the line BB of FIG. The figure which shows the simplified model of the heat exchange tube of the comparative example provided with a slit and two convex supports parts. The figure which shows the simplified model of the heat exchange tube of the comparative example twisted and deformed by stacking. The figure which shows the simplified model of the heat exchange tube of an Example. The figure which shows the simplified model of the heat exchange tube of a preferable embodiment. Sectional drawing of the heat exchange tube of the heat exchanger which concerns on Embodiment 2 of this disclosure Perspective view of the heat exchange tube of the heat exchanger according to the third embodiment of the present disclosure. Sectional drawing of the heat exchange tube which concerns on Embodiment 3. The figure which shows an example of the internal flow path of a heat exchange tube The figure which shows another example of the internal flow path of a heat exchange tube The figure which shows a different example of the internal flow path of a heat exchange tube

The heat exchanger of one aspect of the present disclosure has a plurality of heat exchange tubes laminated with a gap through which the first fluid can pass, and each of the heat exchange tubes exchanges heat with the first fluid. The second fluid flows, communicates with the internal flow path including the folded portion, communicates with the internal flow path, and communicates with the inflow side connecting portion into which the second fluid flows, and communicates with the internal flow path. It is provided in the heat exchange tube portion between the outflow side connection portion where the fluid of 2 flows out and the two flow path portions in the internal flow path extending from the folded portion and facing each other at intervals. The plurality of slits are provided with a plurality of slits and a plurality of convex support portions which are in contact with other adjacent heat exchange tubes to form the gap, and the plurality of slits can be viewed in the stacking direction of the plurality of heat exchange tubes. At least one extends in a state where the center in the extending direction deviates from the straight line connecting the two adjacent convex support portions.

According to such an aspect, in a heat exchanger configured by stacking a plurality of heat exchange tubes, a gap between the heat exchange tubes can be formed with high accuracy.

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

For example, the plurality of slits may extend beyond the center line of the heat exchange tube passing between the inflow side connection portion and the outflow side connection portion in the stacking direction.

For example, the plurality of slits may be provided in the heat exchange tube symmetrically with respect to the center line in the stacking direction.

For example, the heat exchange tube may include a raised portion, and the slit may be a through hole in the raised portion.

For example, the cut-up piece in the cut-up portion may stand up on the downstream side of the first fluid flow direction with respect to the through hole, and may have a wall shape inclined to the upstream side in the flow direction.

For example, the cut-up piece in the cut-up portion may have a bridge shape extending in a direction orthogonal to the flow direction of the first fluid.

For example, the inflow side connection portion and the outflow side connection portion are adjacent to each other, and a through hole is provided in the heat exchange tube portion between the inflow side connection portion and the outflow side connection portion in the stacking direction. May be done.

For example, the inflow side connection portion and the outflow side connection portion may be arranged in the flow direction of the first fluid.

For example, the inflow side connection portion may be located on the downstream side in the flow direction of the first fluid, and the outflow side connection portion may be located on the upstream side.

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

(Embodiment 1)
FIG. 1 is a front view of the heat exchanger according to the first embodiment. Further, FIG. 2 is a partial cross-sectional view of the heat exchanger along the line AA of FIG. The XYZ Cartesian coordinate system shown in the figure is for facilitating the understanding of the present disclosure, and does not limit the embodiment of the present disclosure. The X-axis direction indicates the lateral direction of the heat exchange tube, the Y-axis direction indicates the longitudinal direction of the heat exchange tube, and the Z-axis direction indicates the stacking direction of a plurality of heat exchange tubes.

The heat exchanger 10 shown in FIG. 1 is used for a refrigerating cycle such as an air conditioner or a refrigerating device, or a cooling device for equipment that operates with heat generation. Specifically, in the case of the first embodiment, the heat exchanger 10 heats or cools a fluid (second fluid) F2 such as water or hydrofluorocarbon by a fluid (first fluid) F1 such as air. It is a device for.

As shown in FIGS. 1 and 2, the heat exchanger 10 includes a plurality of heat exchange tubes 20 laminated with a gap through which the first fluid F1 can pass, and a housing 22 that supports the heat exchange tubes 20. Have.

FIG. 3 is a perspective view of the heat exchange tube of the heat exchanger according to the first embodiment. Further, FIG. 4 is a top view of the heat exchange tube of the heat exchanger according to the first embodiment. FIG. 5 is a cross-sectional view of the heat exchange tube along the line BB of FIG. Note that FIG. 5 shows a state in which two heat exchange tubes are laminated.

As shown in FIGS. 3 to 4, the heat exchange tube 20 is a member having a substantially thin plate shape, that is, a so-called fin shape, and is a member that exchanges heat with the first fluid F1.

As shown in FIG. 5, the heat exchange tube 20 is made by, for example, joining two press-molded metal thin plates 20A and 20B to each other. In the case of the first embodiment, the metal thin plates 20A and 20B used for the heat exchange tube 20 have a brazing material layer such as an aluminum silicon alloy formed on both sides thereof, and an aluminum substrate having a thickness of 0.2 mm, that is, a so-called clad plate. Is. The embossed portions 20a and 20b are molded by press molding on the two metal thin plates 20A and 20B, respectively. The internal flow path 26 of the heat exchange tube 20 is formed by joining the two metal thin plates 20A and 20B in a state where the embossed portions 20a and 20b face each other. The heat exchange tube 20 may be made of a clad material having a brazing material layer such as copper or nickel formed on both sides of a stainless steel substrate, or may be made of a copper substrate having a brazing material bonded or plated on both sides. May be done.

As shown in FIGS. 3 to 5, the heat exchange tube 20 communicates with the internal flow path 26 and communicates with the cylindrical inflow side connecting portion 28 into which the second fluid F2 flows into the internal flow path 26. A tubular outflow side connection portion 30 through which the second fluid F2 flows out is provided. In the case of the first embodiment, the inflow side connection portion 28 and the outflow side connection portion 30 are arranged in the lateral direction (X-axis direction) at the center of the heat exchange tube 20 in the longitudinal direction (Y-axis direction). Have been placed. When a plurality of heat exchange tubes 20 are stacked, the inflow side connection portions 28 of the plurality of heat exchange tubes 20 are connected in the stacking direction (Z-axis direction), and the outflow side connection portions 30 are connected in the stacking direction. Will be done. The inflow side connection portions 28 and the outflow side connection portions 30 are heat-bonded, for example, brazed. By connecting the plurality of inflow side connecting portions 28, as shown in FIG. 2, an inflow side manifold flow path 32 for distributing the second fluid F2 is formed in the internal flow path 26 of each of the heat exchange tubes 20. Further, by connecting the plurality of outflow side connection portions 30, an outflow side manifold flow path 34 is formed in which the second fluid F2 from the internal flow path 26 of each of the heat exchange tubes 20 joins.

It is preferable that the inflow side connection portion 28 and the outflow side connection portion 30 are aligned in the flow direction (X-axis direction) of the first fluid F1, that is, overlap in the flow direction as in the first embodiment. .. As a result, the flow path resistance to the first fluid F1 flowing through the gap S between the heat exchange tubes 20 can be reduced as compared with the case where these are not arranged in the flow direction.

Further, considering the heat exchange rate between the first fluid F1 and the second fluid F2, the inflow side connecting portion 28 is located on the downstream side in the flow direction (X-axis direction) of the first fluid F1 and is located on the outflow side. It is preferable that the connecting portion 30 is located on the upstream side in the flow direction of the first fluid F1. As shown in FIG. 3, the second fluid F2 flowing from the inflow side connection portion 28 to the outflow side connection portion 30 via the internal flow path 26 is the second fluid F2 in the stacking direction (Z-axis direction) of the heat exchange tube 20. It flows in the direction opposite to the flow direction of the fluid F1 of 1. As a result, the flow of the second fluid F2 can be regarded as a countercurrent to the flow of the first fluid F1. As a result, the inflow side connecting portion 28 is located on the upstream side in the flow direction of the first fluid F1, as compared with the case where the first and second fluids F1 and F2 flow in the same direction in the stacking direction. The heat exchange rate between the first and second fluids F1 and F2 is improved as compared with the case where the outflow side connecting portion 30 is located on the downstream side.

As shown in FIGS. 1 and 2, a plurality of heat exchange tubes 20 in a laminated state are housed in the housing 22. The housing 22 has a tubular shape that opens in the lateral direction (X-axis direction) of the heat exchange tube 20, whereby the flow direction of the first fluid F1 is restricted to the lateral direction of the heat exchange tube 20. ..

Further, in the case of 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. A laminated body thereof is produced by heating the top plate portion 22a, the plurality of heat exchange tubes 20, and the bottom plate portion 22b in a laminated state and joining them to each other. After that, the heat exchanger 10 is manufactured by fixing the side wall portion 22c to the top plate portion 22a and the bottom plate portion 22b of the laminated body with screws or the like.

Further, the housing 22 includes an inflow port 36 communicating with the inflow side manifold flow path 32 and an outflow port 38 communicating with the outflow side manifold flow path 34. The second fluid F2 enters the inflow side manifold flow path 32 via the inflow port 32, and enters the internal flow path 26 of each of the heat exchange tubes 20 from the inflow side manifold flow path 32. The second fluid F2 in the internal flow path 26 of each of the heat exchange tubes 20 merges at the outflow side manifold flow path 34 and flows out to the outside of the heat exchanger 10 through the outflow port 38.

As shown in FIG. 5, the plurality of heat exchange tubes 20 are laminated with a gap S through which the first fluid F1 can pass. In order to form and maintain the gap S, each of the heat exchange tubes 20 is provided with a plurality of convex support portions 40 and 42 on both sides in the stacking direction (Z-axis direction). The plurality of convex support portions 40 are provided on one surface (metal thin plate 20A) of the heat exchange tube 20, and the plurality of convex support portions 42 are provided on the other surface (metal thin plate 20B). Further, the positions of the plurality of convex support portions 40 and the positions of the plurality of convex support portions 42 coincide with each other in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20.

The two heat exchange tubes 20 are supported by the plurality of convex support portions 42 of the heat exchange tube 20 and the plurality of convex support portions 44 of the adjacent heat exchange tubes 20 in contact with each other and supporting each other. A gap S through which the first fluid F1 can pass is formed between the two. The convex support portion 42 and the convex support portion 44 are heat-bonded, for example, brazed.

As shown in FIG. 4, in the case of the first embodiment, the internal flow path 26 of the heat exchange tube 20 is in the lateral direction (X-axis direction) of the heat exchange tube 20 in the stacking direction (Z-axis direction). It has a shape that is symmetric with the extending center line C1 and symmetric with the center line C2 extending in the longitudinal direction (Y-axis direction). Specifically, the internal flow path 26 has a substantially "M" shape extending from the inflow side connection portion 28 toward the outflow side connection portion 30 and arranged on one side in the longitudinal direction of the heat exchange tube 20. It is composed of a flow path 26L and a substantially “M” -shaped flow path 26R extending from the inflow side connection portion 28 toward the outflow side connection portion 30 and arranged on the other side in the longitudinal direction. As a result, the internal flow path 26 includes a plurality of folded portions 26a in which the flow direction of the second fluid F2 changes by 180 degrees. When the internal flow path 26 includes such a plurality of folded portions 26a, heat exchange between the second fluid F2 flowing in the internal flow path 26 and the first fluid F1 flowing on the heat exchange tube 20 The rate improves.

As shown in FIG. 4, the heat exchange tube 20 is provided with a plurality of slits 46. Specifically, a plurality of slits 46 are formed in the portion of the heat exchange tube 20 between the two flow path portions 26b in the internal flow path 26 extending from the folded-back portion 26a and facing each other at intervals. There is. In the case of the first embodiment, the slit 46 is an elongated hole extending in the extending direction (Y-axis direction) of the linear flow path portion 26b and penetrating the heat exchange tube 20. The slit 46 is formed in the heat exchange tube 20 by, for example, punching.

The slit 46 is provided to suppress heat exchange between the second fluid F2 flowing through each of the two flow path portions 26b extending from the folded-back portion 26a. That is, the heat transfer via the heat exchange tube 20 from the second fluid F2 in one flow path portion 26b to the second fluid F2 in the other flow path portion 26b is suppressed by the slit 46. In other words, the slit 46 suppresses heat shortcuts. When such a heat shortcut occurs, the heat exchange rate between the first and second fluids F1 and F2 decreases, so a slit 46 is provided as a countermeasure.

Although the heat shortcut can be suppressed by such a slit 46, the heat exchange tube 20 is more easily deformed than the case without the slit. Therefore, the plurality of slits 46 are provided at appropriate positions so that the deformation of the heat exchange tube 20 can be suppressed.

Specifically, as shown in FIG. 4, two convex shapes in which the centers of the slits 46 in the extending direction (Y-axis direction) are adjacent to each other in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20. At least one slit 46 is provided in the heat exchange tube 20 in a state of being off the straight line connecting the support portions 40. The reason will be explained.

FIG. 6A shows a simplified model of a comparative heat exchange tube provided with a slit and two convex supports. FIG. 6B shows a simplified model of a heat exchange tube of a comparative example twisted and deformed by laminating.

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

As described above, the heat exchange tubes 120 of the plurality of comparative examples are laminated in a state of being supported by each other via the convex support portions 140 and 142, respectively. However, when the allowable manufacturing error of each of the heat exchange tubes 120 (for example, the height error of the convex supports 140 and 142) and the allowable assembly error of the plurality of heat exchange tubes 120 are accumulated, the heat exchange tube 120 has a certain heat exchange tube 120. Deformation can occur.

For example, as shown in FIG. 6B, due to the accumulation of errors, the heat exchange tube is twisted and deformed so that the positions (height positions) of the two adjacent convex support portions 140 in the stacking direction (Z-axis direction) are different. Can occur at 120. This occurs because the two convex support portions 140 are not constrained to each other by the slits 146 and tend to shift in the stacking direction with respect to each other. When such torsional deformation occurs, the size of the gap between the heat exchange tubes 120 varies, and as a result, the flow path resistance to the first fluid passing through the gap may vary. As a result, the heat exchange rate of the heat exchanger may vary.

As shown in FIG. 6A, such torsional deformation is likely to occur when the center CS of the slit 146 in the extending direction (Y-axis direction) is located on the straight line VL connecting two adjacent convex support portions 140. .. Further, the larger the length of the slit 146, the larger the amount of deformation of the heat exchange tube 120.

Therefore, in the case of the first embodiment, as shown in FIG. 4, the centers of the slits 46 in the extending direction (Y-axis direction) are adjacent to each other in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20. At least one slit 46 is provided in the heat exchange tube 20 in a state of being off the straight line connecting the two matching convex support portions 40.

FIG. 7A is a diagram showing a simplified model of the heat exchange tube of the embodiment. Further, FIG. 7B is a diagram showing a simplified model of the heat exchange tube of the preferred embodiment.

In the heat exchange tube 20 of the embodiment shown in FIG. 7A, the central CSs of the slits 46 in the extending direction (Y-axis direction) are adjacent to each other in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20. It is off the straight line VL connecting the two convex support portions 40. As a result, the heat exchange tube 20 suppresses the deformation caused by laminating as compared with the heat exchange tube 120 of the comparative example shown in FIG. 6A in which the central CL is located on the straight line VL.

The deformation of the heat exchange tube 20 is further suppressed as the straight line VL connecting the two adjacent convex support portions 40 moves away from the center CS of the slit 46 and approaches both ends of the slit 46.

In the heat exchange tube 20 of the preferred embodiment shown in FIG. 7B, the slit 46 is a straight line VL connecting two adjacent convex support portions 40 in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20. It extends without crossing. As a result, the two convex support portions 40 are difficult to shift in the stacking direction with respect to each other because the slit 46 does not exist between them. As a result, the heat exchange tube 20 shown in FIG. 7B is more difficult to be deformed than the heat exchange tube 20 of the embodiment shown in FIG. 7A.

In addition to being positioned with respect to the plurality of convex support portions 40 (42) in order to suppress deformation of the heat exchange tube 20, the slit 46, in the case of the first embodiment, does the following. In consideration of this, the heat exchange tube 20 is provided.

First, in the case of the first embodiment, as shown in FIG. 4, the plurality of slits 46 extend so as to remove the center line C2 extending in the longitudinal direction (Y-axis direction) of the heat exchange tube 20. , Is provided on the heat exchange tube 20. That is, the plurality of slits 46 are provided in the heat exchange tube 20 so as to extend beyond the center line C2 passing between the inflow side connection portion 28 and the outflow side connection portion 30. This prevents a certain heat exchange tube 20 from bending along the center line C2 when a plurality of heat exchange tubes 20 are laminated.

Specifically, there is an acceptable error in the size of the inflow side connection portion 28 and the outflow side connection portion 30 of each of the heat exchange tubes 20 in the stacking direction (Z-axis direction). When a plurality of heat exchange tubes 20 are laminated and the errors are accumulated, bending stress is generated between the inflow side connection portion 28 and the outflow side connection portion 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 inflow side connection portion 28 and the outflow side connection portion 30, if a plurality of slits 46 extend along the center line C2. The heat exchange tube 20 may bend.

Therefore, as shown in FIG. 4, the plurality of slits 46 are provided in the heat exchange tube 20 by removing the center line C2 passing between the inflow side connection portion 28 and the outflow side connection portion 30.

Further, in the case of the first embodiment, as shown in FIG. 4, the plurality of slits 46 are the two center lines C1 of the heat exchange tubes 20 in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20. , C2 are arranged symmetrically. As a result, the rigidity of the heat exchange tube 20 becomes uniform, and the deformation of the heat exchange tube 20 is suppressed.

In the case of the first embodiment, the heat exchange tube 20 also includes components other than the slit 46 as components for suppressing heat shortcuts.

As shown in FIG. 4, when viewed in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20, the inflow side connection portion 28 and the outflow side connection portion 30 are close to each other in a state where the internal flow path 26 does not exist between them. Adjacent to each other. A through hole 48 for suppressing heat transfer between the second fluid F2 flowing through the inflow side connection portion 28 and the second fluid F2 flowing through the outflow side connection portion 30 is provided in the portion of the heat exchange tube 20 in the meantime. ing.

Specifically, in the heat exchange tube 20, the temperature difference between the second fluid F2 flowing through the inflow side connection portion 28 and the second fluid F2 flowing through the outflow side connection portion 30 is the largest. Therefore, when the inflow side connection portion 28 and the outflow side connection portion 30 are adjacent to each other, a large amount of heat shortcut may occur between them. A through hole 48 is provided to suppress this heat shortcut.

Further, in the case of the first embodiment, as shown in FIG. 4, heat exchange between the inflow side connection portion 28 and the internal flow path 26 in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20. The portion of the heat exchange tube 20 between the portion of the tube 20 and the outflow side connection portion 30 and the internal flow path 26 is also provided with a through hole 50 for suppressing a heat shortcut between them.

According to the first embodiment as described above, in the heat exchanger configured by laminating a plurality of heat exchange tubes, it is possible to accurately form a gap between the heat exchange tubes.

(Embodiment 2)
In the case of the first embodiment described above, as shown in FIG. 5, the slit 46 has a through-hole shape formed by removing a part of the heat exchange tube 20 by, for example, punching. The method of forming the slit of the second embodiment is different from that of the first embodiment described above. The second embodiment will be described with a focus on this difference.

FIG. 8 is a cross-sectional view of a heat exchange tube of the heat exchanger according to the second embodiment. Note that FIG. 8 shows a state in which two heat exchange tubes are laminated.

As shown in FIG. 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 first embodiment described above. However, the slit 252b of the second embodiment is composed of a part of the cut-up portion 252.

The cut-up portion 252 has, for example, a square bracket-shaped notch formed in the heat exchange tube 220, and the cut-up piece 252a and the cut-up piece 252a, which are obtained by erecting the portion surrounded by the notch, stand up. It consists of through holes created by. The through hole in the cut-up portion 252 functions as a slit 252b that suppresses a heat shortcut between the second fluids F2 flowing through the portion of the different internal flow path 226 (the portion extending from the folded portion and facing each other). ..

Further, in the case of the second embodiment, the cut-up piece 252a in the cut-up portion 252 stands up on the downstream side in the flow direction of the first fluid F1 with respect to the slit 252b (through hole), and is upstream in the flow direction. It is like a wall tilted to the side. Therefore, the cut-up piece 252a functions as a wind direction plate of the first fluid F1. Specifically, the cut-up piece 252a guides the first fluid F1 into the slit 252b. As a result, the first fluid F1 flows into the different gaps S of the heat exchange tube 20. As a result, the first fluid F1 flows in a complicated manner in the heat exchanger, whereby the heat exchange rate between the first fluid F1 and the second fluid F2 is improved as compared with the above-described first embodiment. do.

Also in the second embodiment, similarly to the first embodiment described above, in the heat exchanger configured by laminating a plurality of heat exchange tubes, the gap between the heat exchange tubes can be formed with high accuracy.

(Embodiment 3)
The third embodiment is an improved form of the second embodiment described above. Specifically, the shape of the cut-up piece in the cut-up portion is different.

FIG. 9 is a perspective view of the heat exchange tube according to the third embodiment. Further, FIG. 10 is a cross-sectional view of a heat exchange tube of the heat exchanger according to the third embodiment. Note that FIG. 10 shows a state in which two heat exchange tubes are laminated.

As shown in FIGS. 9 and 10, the heat exchange tube 320 of the heat exchanger according to the third embodiment also includes a cut-up portion 352 like the heat exchange tube 220 of the second embodiment described above. In the case of the third embodiment, the cut-up piece 352a in the cut-up portion 352 has a bridge shape extending in a direction orthogonal to the flow direction of the first fluid F1. The through hole 352b in the cut-up portion 352 functions as a slit that suppresses a heat shortcut between the second fluids F2 flowing through the portion of the different internal flow path 326 (the portion extending from the folded portion and facing each other).

As shown in FIG. 10, the first fluid F1 is split above and below it by a bridge-shaped cut-up piece 352a. As a result, the first fluid F1 flows in a complicated manner in the heat exchanger as compared with the second embodiment described above, whereby the heat exchange rate between the first fluid F1 and the second fluid F2 is further improved. do.

Also in the third embodiment, similarly to the first embodiment described above, in the heat exchanger configured by laminating a plurality of heat exchange tubes, the gap between the heat exchange tubes can be formed with high accuracy.

Although the present disclosure has been described above with reference to the above-described embodiments 1 to 3, the embodiments of the present disclosure are not limited to the above-described embodiments.

For example, in the case of the first embodiment described above, as shown in FIG. 4, the internal flow path 26 of the heat exchange tube 20 is in the lateral direction (Z-axis direction) in the stacking direction (Z-axis direction) of the plurality of heat exchange tubes 20. The shape is symmetrical with the center line C1 extending in the X-axis direction and the center line C2 extending in the longitudinal direction (Y-axis direction). Specifically, the internal flow path 26 has a substantially “M” -shaped flow path 26L arranged on one side in the longitudinal direction of the heat exchange tube 20 and a substantially “M” arranged on the other side in the longitudinal direction. It is composed of a character flow path 26R.

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

11, 12, and 13 are diagrams showing various examples of the internal flow path of the heat exchange tube.

In the case of the heat exchange tube 420 shown in FIG. 11, the internal flow path 426 is the center line C1 extending in the lateral direction (X-axis direction) and the longitudinal direction in the stacking direction (Z-axis direction) of the heat exchange tube 420. It has a center line C2 symmetrical shape extending in the direction (Y-axis direction). Specifically, the internal flow path 426 extends from the inflow side connection portion 428 toward the outflow side connection portion 430 and is arranged on one side in the longitudinal direction of the heat exchange tube 20 in a substantially "U" shape. It is composed of a flow path 426L and a substantially "U" -shaped flow path 426R extending from the inflow side connection portion 428 toward the outflow side connection portion 430 and arranged on the other side in the longitudinal direction. As a result, the internal flow path 426 includes two folded-back portions 426a and a flow path portion 426b extending from the folded-back portion 426a and facing each other at a distance. A plurality of slits 446 are provided in the portion of the heat exchange tube 420 between the flow path portions 426b.

In the case of the heat exchange tube 520 shown in FIG. 12, the internal flow path 526 has a center line C2 symmetrical shape extending in the longitudinal direction (Y-axis direction) in the stacking direction (Z-axis direction) of the heat exchange tube 520. To prepare for. However, the shape of the internal flow path 526 is not a shape symmetrical with the center line C1 extending in the lateral direction (X-axis direction). The reason is that the inflow side connection portion 528 and the outflow side connection portion 530 are provided in the heat exchange tube 520 in a state where they are arranged in the lateral direction at one end in the longitudinal direction instead of the center in the longitudinal direction. Is. The internal flow path 526 extends from the inflow side connection portion 528 toward the outflow side connection portion 530 and has a substantially “M” shape. As a result, the internal flow path 526 includes three folded-back portions 526a and flow path portions 526b extending from the folded-back portion 526a and facing each other at intervals. A plurality of slits 546 are provided in the portion of the heat exchange tube 520 between the flow path portions 526b. The plurality of slits 546 are provided so as to be removed from the center line C2.

In the case of the heat exchange tube 620 shown in FIG. 13, the shape of the internal flow path 626 is the center line C1 extending in the lateral direction (X-axis direction) in the stacking direction (Z-axis direction) of the heat exchange tube 520. Moreover, the shape is not symmetrical with the center line C2 extending in the longitudinal direction (Y-axis direction). The reason is that the inflow side connection portion 628 and the outflow side connection portion 630 are arranged on the diagonal line of the heat exchange tube 620. Therefore, the internal flow path 626 extends from the inflow side connection portion 628 toward the outflow side connection portion 630 and has an "inverted S" shape, whereby the internal flow path 626 has two folded portions. It contains a 626a and a flow path portion 626b extending from the folded portion 626a and facing each other at a distance. A plurality of slits 646 are provided in a portion of the heat exchange tube 620 between the flow path portions 626b. It is provided.

As described above, the shape of the internal flow path of the heat exchanger and the positions of the inflow side connection portion and the outflow side connection portion can be variously changed according to 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 portion. That is, in the heat exchange tube in the heat exchanger according to the embodiment of the present disclosure, two flow path portions facing each other are generated at intervals by one folded portion, and heat exchange between the two flow path portions is generated. A heat exchange tube having a slit in the tube portion.

Further, in the case of the first embodiment described above, as shown in FIG. 3, the first fluid F1 heat-exchanged by the heat exchanger 10 flows in the lateral direction (X-axis direction) of the heat exchange tube 20. However, the embodiments of the present disclosure are 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.

That is, the heat exchanger according to the embodiment of the present disclosure has, in a broad sense, a plurality of heat exchange tubes laminated with a gap through which the first fluid can pass, and each of the heat exchange tubes has a plurality of heat exchange tubes. An inflow side connection portion through which a second fluid that exchanges heat with the first fluid flows and communicates with the internal flow path including a folded portion and into which the second fluid flows, and the inside thereof. The said between the outflow side connection portion that communicates with the flow path and outflows the second fluid, and the two flow path portions in the internal flow path that extend from the folded portion and face each other at intervals. A plurality of slits provided in a portion of the heat exchange tube and a plurality of convex support portions which are in contact with other adjacent heat exchange tubes to form the gap are provided, and the stacking direction of the plurality of heat exchange tubes is provided. Visually, at least one of the plurality of slits extends in a state where the center in the extending direction deviates from the straight line connecting the two adjacent convex support portions.

As described above, the above-described embodiment has been described as an example of the technique in the present disclosure. For that purpose, drawings and detailed explanations are provided. Therefore, among the components described in the drawings and the detailed description, not only the components essential for problem solving but also the components not essential for problem solving in order to exemplify the above-mentioned technique. Can also be included. Therefore, the fact that those non-essential components are described in the drawings or detailed description should not immediately determine that those non-essential components are essential.

Further, since the above-described embodiment is for exemplifying the technique in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of claims or the equivalent thereof.

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

20 Heat exchange tube 26 Internal flow path 26a Folded part 26b Flow path part 40 Convex support part 46 Slit F1 First fluid

Claims (10)

It has a plurality of heat exchange tubes laminated with a gap through which the first fluid can pass.
Each of the heat exchange tubes
A second fluid that exchanges heat with the first fluid flows, and has an internal flow path including a folded portion and an internal flow path.
An inflow side connection portion that communicates with the internal flow path and into which the second fluid flows,
An outflow side connection portion that communicates with the internal flow path and allows the second fluid to flow out.
A plurality of slits provided in the heat exchange tube portion between the two flow path portions in the internal flow path extending from the folded portion and facing each other at intervals, and a plurality of slits.
It comprises a plurality of convex supports, which are in contact with other adjacent heat exchange tubes to form the gap.
In the stacking direction view of the plurality of heat exchange tubes, at least one of the plurality of slits extends in a state where the center in the extending direction is off the straight line connecting the two adjacent convex supports portions. ,Heat exchanger.
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 convex support portions in the stacking direction view.
The first or second aspect of the present invention, wherein the plurality of slits extend on the center line of the heat exchange tube passing between the inflow side connection portion and the outflow side connection portion in the stacking direction. Heat exchanger.
The heat exchanger according to any one of claims 1 to 3, wherein the plurality of slits are provided in the heat exchange tube symmetrically with respect to the center line in the stacking direction.
The heat exchange tube is provided with a raised portion and has a raised portion.
The heat exchanger according to any one of claims 1 to 4, wherein the slit is a through hole in the cut-up portion.
The fifth aspect of the present invention, wherein the cut-up piece in the cut-up portion stands up with respect to the through hole on the downstream side in the flow direction of the first fluid and is inclined toward the upstream side in the flow direction. Heat exchanger.
The heat exchanger according to claim 5, wherein the cut-up piece in the cut-up portion has a bridge shape extending in a direction orthogonal to the flow direction of the first fluid.
The inflow side connection portion and the outflow side connection portion are adjacent to each other,
The heat according to any one of claims 1 to 7, wherein a through hole is provided in a portion of the heat exchange tube between the inflow side connection portion and the outflow side connection portion in the stacking direction. Exchanger.
The heat exchanger according to any one of claims 1 to 8, wherein the inflow side connection portion and the outflow side connection portion are arranged in the flow direction of the first fluid.
The heat exchanger according to claim 9, wherein the inflow side connection portion is located on the downstream side in the flow direction of the first fluid, and the outflow side connection portion is located on the upstream side.

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