Heat exchanger and manufacturing method of the same

Abstract

To inhibit quality deterioration of a heat exchanger cause by misalignment between a cylindrical body and a heat transfer wall.SOLUTION: A heat exchanger includes: a cylindrical body including an inner cylinder and an outer cylinder and having an air gap between the inner cylinder and the outer cylinder; a heat transfer wall extending in an axial direction of the inner cylinder in the inner cylinder and joined to the inner cylinder; engagement members which cause the outer cylinder and the heat transfer wall to engage with each other and cause the inner cylinder and the heat transfer wall to engage with each other with a gap formed in an axial direction therebetween; and a brazing material which joins the outer cylinder and the heat transfer wall to each other and joins the inner cylinder and the heat transfer wall to each other.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to a heat exchanger and a method for manufacturing a heat exchanger. [Background technology]

[0002] Patent Document 1 describes a heat exchanger in which heat transfer tubes are provided inside a shell body, a first fluid flows inside the heat transfer tubes, and a second fluid flows inside the shell body.

[0003] Patent document 2 describes a heat exchanger in which a protruding piece is formed at the edge of the long side of one end opening of the flat pipe, protruding from the side wall in the axial direction of the flat pipe so as to crimp and fix the side wall, the flat pipe, and the adjacent side wall of the flat pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-75838 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-148319 Summary of the Invention [Problem to be solved by the invention]

[0005] In a heat exchanger having a heat transfer wall inside a cylindrical body that transfers heat from the cylindrical body, for example, if the cylindrical body and the heat transfer wall are joined by brazing using a brazing material, the cylindrical body and the heat transfer wall can be efficiently joined by heating the entire heat exchanger in a furnace.

[0006] When brazing the cylindrical body to the insulating wall, the cylindrical body and the insulating wall are temporarily fixed together before brazing. In this case, if there is a time difference in the thermal expansion of the cylindrical body and the insulating wall, the heating during brazing will cause a relative positional deviation between the cylindrical body and the insulating wall.

[0007] An object of the present disclosure is to suppress deterioration in the quality of a heat exchanger due to misalignment between a cylindrical body and a heat transfer wall. [Means for solving the problem]

[0008] The heat exchanger of the first embodiment comprises a cylindrical body having an inner tube and an outer tube with a gap formed between the inner tube and the outer tube, a heat transfer wall extending inside the inner tube in the axial direction of the inner tube and joined to the inner tube, a locking member that locks the outer tube and the heat transfer wall, and the inner tube and the heat transfer wall with a gap in the axial direction, and a brazing material that joins the outer tube and the heat transfer wall, and the inner tube and the heat transfer wall.

[0009] In this heat exchanger, heat is exchanged between a fluid (referred to as the "first fluid") flowing inside the inner cylinder and a fluid (referred to as the "second fluid") flowing through the gap between the inner and outer cylinders. A heat transfer wall is joined to the inner cylinder inside the inner cylinder, so the heat of the second fluid can be transferred to the first fluid by the heat transfer wall.

[0010] The locking members lock the outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall, with a gap in the axial direction of the inner cylinder. Therefore, during the manufacturing process of the heat exchanger, when brazing, i.e., when the brazing filler metal is heated to join the outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall, relative movement between the outer cylinder and the heat transfer wall and the inner cylinder and the heat transfer wall is permitted within this gap. Since the outer cylinder and the heat transfer wall and the inner cylinder and the heat transfer wall can be joined by the brazing filler metal while absorbing positional misalignment between the outer cylinder and the heat transfer wall and the inner cylinder and the heat transfer wall during heating, deformation of the outer cylinder, the inner cylinder, and the heat transfer wall and separation of the brazing filler metal can be suppressed, and deterioration of the quality of the heat exchanger can be suppressed.

[0011] In the heat exchanger of the second aspect, in the first aspect, the heat transfer wall also extends in a first direction perpendicular to the axial direction and includes a plurality of first walls that are parallel to each other, and a plurality of second walls that extend in a second direction perpendicular to the axial direction and the first direction, are parallel to each other, and intersect with the first walls at intersections.

[0012] The first wall and the second wall can form a plurality of compartments inside the inner cylinder. The first wall and the second wall transfer heat of the second fluid to the first fluid flowing through the plurality of compartments, enabling efficient heat transfer.

[0013] A third aspect of the heat exchanger is the second aspect, wherein the brazing material joins the first wall and the second wall at the intersection.

[0014] The brazing material can join the first wall and the second wall at the intersection, and can maintain constant heat transfer and relative positions between the first wall and the second wall.

[0015] A fourth aspect of the heat exchanger is the third aspect, wherein the locking member includes a locking recess formed on one of the outer tube, the inner tube, and the heat transfer wall, and a locking protrusion formed on the other of the outer tube, the inner tube, and the heat transfer wall, and fitted into the locking recess with the gap therebetween.

[0016] The locking member can be configured with a simple structure including a locking recess and a locking protrusion.

[0017] A fifth aspect of the heat exchanger is the fourth aspect, wherein the locking member includes a clamping member that protrudes from the locking protrusion and clamps the outer tube or the inner tube at the protruding end side between the outer tube on which the locking protrusion is formed, the inner tube, and the heat transfer wall.

[0018] The clamping member clamps the outer cylinder or the inner cylinder, so that the engagement between the outer cylinder and the heat transfer wall, or the engagement between the inner cylinder and the heat transfer wall, can be maintained.

[0019] A sixth aspect of the heat exchanger is the fifth aspect, wherein the clamping member is a clamping claw whose protruding portion from the locking protrusion is bent to contact one of the outer tube and inner tube and the heat transfer wall.

[0020] The clamping member can be configured with a simple structure in which the protruding portions of the clamping claws are bent.

[0021] The heat exchanger of a seventh aspect is the heat exchanger of any one of the second to sixth aspects, further comprising slits formed below the brazing material in the outer cylinder, the inner cylinder, and the intersection portion.

[0022] Slits are formed below the brazing filler metal in the outer and inner tubes and at the intersections. Therefore, by applying brazing filler metal to the upper portions of the slits before brazing, the molten brazing filler metal can pass through the slits during brazing. This brazing filler metal can then join the outer tube and the heat transfer wall, the inner tube and the heat transfer wall, and the first and second walls.

[0023] An eighth aspect of the heat exchanger is the seventh aspect, wherein the brazing material closes the slits.

[0024] Since the brazing material closes the slits, inadvertent heat transfer through the slits does not occur, and the heat exchanger has a highly rigid structure.

[0025] A ninth aspect of the heat exchanger manufacturing method includes a cylindrical body having an inner tube and an outer tube, with a gap formed between the inner tube and the outer tube, and a heat transfer wall extending in the axial direction of the inner tube is placed inside the inner tube, and the outer tube and the heat transfer wall, and the inner tube and the heat transfer wall, are engaged with an engaging member with a gap in the axial direction, and the outer tube and the heat transfer wall, and the inner tube and the heat transfer wall are joined with brazing material.

[0026] In this heat exchanger manufacturing method, the locking members lock the outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall, with a gap in the axial direction of the inner cylinder. Therefore, during brazing in the heat exchanger manufacturing process, i.e., when the brazing filler metal is heated to join the outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall, relative movement between the outer cylinder and the heat transfer wall and the inner cylinder and the heat transfer wall is permitted within this gap. Since misalignment between the outer cylinder and the heat transfer wall and the inner cylinder and the heat transfer wall during heating can be absorbed and the outer cylinder and the heat transfer wall and the inner cylinder and the heat transfer wall can be joined by the brazing filler metal, deformation of the outer cylinder, the inner cylinder, and the heat transfer wall and separation of the brazing filler metal can be suppressed, and deterioration in the quality of the heat exchanger can be suppressed.

[0027] A tenth aspect of the heat exchanger manufacturing method is the ninth aspect, wherein the heat transfer wall includes a plurality of first walls that also extend in a first direction perpendicular to the axial direction and are parallel to each other, and a plurality of second walls that extend in a second direction perpendicular to the axial direction and the first direction and are parallel to each other and intersect with the first walls at intersections, and the first walls and the second walls are joined at the intersections with the brazing material.

[0028] By joining the first wall and the second wall with brazing material at the intersection, the heat transfer and relative positions of the first wall and the second wall can be maintained constant. [Effects of the Invention]

[0029] The technology disclosed herein can suppress deterioration in the quality of the heat exchanger due to misalignment between the cylindrical body and the heat transfer wall. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a perspective view showing a heat exchanger according to a first embodiment. [Figure 2] FIG. 2 is a perspective view showing the heat exchanger of the first embodiment, with a part cut away. [Figure 3] FIG. 3 is an exploded perspective view showing the heat exchanger of the first embodiment. [Figure 4] FIG. 4 is a plan view showing the heat exchanger of the first embodiment. [Figure 5] FIG. 5 is a cross-sectional view of the heat exchanger of the first embodiment taken along line 5-5 in FIG. [Figure 6] FIG. 6 is a cross-sectional view of the heat exchanger of the first embodiment taken along line 6-6 in FIG. [Figure 7] FIG. 7 is an enlarged perspective view of the heat exchanger of the first embodiment taken along the arrow 7 in FIG. 2. FIG. [Figure 8A] FIG. 8A is a front view showing the heat transfer wall (first wall) of the heat exchanger of the first embodiment. [Figure 8B] FIG. 8B is a plan view showing the heat transfer wall (second wall) of the heat exchanger of the first embodiment. [Figure 9] 9 is an enlarged perspective view of the heat exchanger of the first embodiment taken along the arrow 9 in FIG. 2. FIG. [Figure 10] FIG. 10 is an enlarged perspective view of the heat exchanger of the first embodiment, taken along the arrow 10 in FIG. 2. FIG. [Figure 11A] FIG. 11A is a plan view showing a locking member of the heat exchanger of the first embodiment. [Figure 11B] 11B is a cross-sectional view taken along line 11B-11B in FIG. 11A, showing the locking member of the heat exchanger of the first embodiment. [Figure 12] FIG. 12 is a cross-sectional view showing the position of the gap in the heat exchanger of the first embodiment. [Figure 13] FIG. 13 is a plan view showing the inner cylinder upper plate of the heat exchanger of the first embodiment. [Figure 14A] 14A is an enlarged plan view of the portion indicated by the arrow 14A in FIG. 13, showing the inner cylinder upper plate of the heat exchanger of the first embodiment. [Figure 14B] FIG. 14B is an enlarged plan view showing a state in which the brazing material is applied to the inner cylinder upper plate of the heat exchanger of the first embodiment. [Figure 15] FIG. 15 is a plan view showing the outer cylinder upper plate of the heat exchanger of the first embodiment. [Figure 16A] 16A is an enlarged plan view of the portion indicated by the arrow 16A in FIG. 15, showing the outer cylinder upper plate of the heat exchanger of the first embodiment. [Figure 16B] FIG. 16B is an enlarged plan view showing a state in which the brazing material is applied to the outer cylinder upper plate of the heat exchanger of the first embodiment. [Figure 17] 17 is a perspective view of the heat exchanger of the first embodiment, taken along the arrow 17 in FIG. 5, in a partially enlarged manner. [Figure 18] FIG. 18 is a perspective view of the portion of the heat exchanger of the first embodiment as viewed from the arrow 18 in FIG. 6, showing a part of the heat exchanger in an enlarged scale. [Figure 19] FIG. 19 is an enlarged perspective view of the heat exchanger of the first embodiment taken along the arrow 19 in FIG. 2. FIG. [Figure 20A] FIG. 20A is a cross-sectional view showing the brazing material application position of the heat exchanger of the first embodiment. [Figure 20B] FIG. 20B is an enlarged cross-sectional view showing the brazing material application position of the heat exchanger of the first embodiment at the intersection of the first wall and the second wall. [Figure 20C]FIG. 20C is a cross-sectional view showing a state in which the brazing material flows at the intersection between the first wall and the second wall of the heat exchanger of the first embodiment. [Figure 20D] FIG. 20D is a cross-sectional view showing a state in which the first wall and the second wall of the heat exchanger of the first embodiment are joined with a brazing material at their intersections. [Figure 21A] FIG. 21A is a plan view showing a locking member of a heat exchanger according to a first modified example. [Figure 21B] 21B is a cross-sectional view taken along line 21B-21B in FIG. 21A, showing the locking member of the heat exchanger of the first modified example. [Figure 22A] FIG. 22A is a plan view showing a locking member of a heat exchanger according to a second modified example. [Figure 22B] 22B is a cross-sectional view taken along line 22B-22B in FIG. 22A, showing the locking member of the heat exchanger of the second modified example. [Figure 23A] FIG. 23A is a plan view showing a locking member of a heat exchanger according to a third modified example. [Figure 23B] FIG. 23B is a cross-sectional view taken along line 23B-23B in FIG. 23A, showing the locking member of the heat exchanger of the third modified example. [Figure 24A] FIG. 24A is a plan view showing a locking member of a heat exchanger according to a fourth modified example. [Figure 24B] FIG. 24B is a cross-sectional view taken along line 24B-24B in FIG. 24A, showing the locking member of the heat exchanger of the fourth modified example. [Figure 25] FIG. 25 is a side view showing the heat exchanger of the second embodiment. [Figure 26] FIG. 26 is a front view showing the heat exchanger of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0031] The heat exchanger 30 of the first embodiment will be described below with reference to the drawings. In the drawings, the width direction, height direction, and depth direction of the heat exchanger 30 are designated as the X direction, the Y direction, and the Z direction, respectively, and are indicated by arrows X, Y, and Z. However, these directions are for the sake of convenience of explanation and are unrelated to the directions in which the heat exchanger 30 is actually used. The arrow Z direction coincides with the flow direction of a first fluid, which will be described later. Strictly speaking, the -Z direction in FIG. 1 and other figures is the flow direction of the first fluid (see arrow F1 in FIG. 2). Hereinafter, the terms "upstream" and "downstream" may be used based on the flow direction of the first fluid.

[0032] 1 to 9 show a heat exchanger 30. As shown in Fig. 1 to Fig. 3, the heat exchanger 30 has a cylindrical body 32, a heat transfer wall 34, and a locking member 36. Furthermore, as shown in Fig. 14B, Fig. 16B, and Fig. 19, the heat exchanger 30 includes a brazing material 38.

[0033] 4 to 6, the cylindrical body 32 has a rectangular inner cylinder 40 and a rectangular outer cylinder 42, and has a double-cylinder structure in which the outer cylinder 42 is located outside the inner cylinder 40. A gap 44 is defined between the inner cylinder 40 and the outer cylinder 42 around the inner cylinder 40.

[0034] 3, the inner tube 40 has an inner tube upper plate 40U, an inner tube side plate 40S, and an inner tube lower plate 40L, and is formed into a rectangular cylindrical shape by these plates. Similarly, the outer tube 42 has an outer tube upper plate 42U, an outer tube side plate 42S, and an outer tube lower plate 42L, and is also formed into a rectangular cylindrical shape by these plates.

[0035] Both axial end faces (arrow Z direction) of the inner cylinder 40 are closed by cover plates 46. A through-hole is formed in the center of each cover plate 46, and a cylindrical first inlet tube 48F and a first outlet tube 48S are fixed to the cover plates 46 so as to communicate with this through-hole. A first fluid is introduced into the inner cylinder 40 from the first inlet tube 48F, flows inside the inner cylinder 40 as shown by arrow F1 (see FIG. 5), and is discharged to the outside of the inner cylinder 40 from the first outlet tube 48S.

[0036] The axial length (direction of arrow Z) of the inner cylinder 40 is longer than the axial length of the outer cylinder 42. Both axial end portions of the inner cylinder 40 protrude in the direction of arrow Z beyond the outer cylinder 42. Around the inner cylinder 40, both axial end surfaces of the outer cylinder 42 are closed by cover plates 52.

[0037] The outer cylinder 42 has through holes formed at positions near one end and the other end in the axial direction (arrow Z direction). A cylindrical second inlet tube 50F and a cylindrical second outlet tube 50S are fixed to the outer cylinder 42 so as to communicate with the respective through holes. The second fluid is introduced from the second inlet tube 50F into the gap 44, flows through the gap 44, and is discharged from the second outlet tube 50S to the outside of the outer cylinder 42. Heat of the second fluid flowing through the gap 44 acts on the first fluid flowing inside the inner cylinder 40 via the inner cylinder 40 and the heat transfer wall 34.

[0038] In this embodiment, the inner tube upper plate 40U, the inner tube side plate 40S, the inner tube lower plate 40L, the cover plate 46, the outer tube upper plate 42U, the outer tube side plate 42S, the outer tube lower plate 42L, and the cover plate 52 are formed of the same metal material and have no thermal expansion difference. At the joints between these plates, as shown in FIG. 7 , a fixing protrusion 54T is formed on one side of each plate and a fixing recess 54U is formed on the other side. The fixing recess 54U fits snugly into the fixing protrusion 54T, allowing the components to be joined at a 90-degree angle. A fixing claw 56 protrudes from the fixing protrusion 54T. When the fixing protrusion 54T is fitted into the fixing recess 54U, the tip of the fixing claw 56 is bent to sandwich the mating plate. This fixes the respective plates so that they cannot move relative to each other in the X, Y, and Z directions.

[0039] As shown in FIGS. 2 to 6, the heat transfer wall 34 extends in the axial direction of the inner cylinder 40 (the direction of arrow Z). The heat transfer wall 34 includes a plurality of first walls 34F and a plurality of second walls 34S. Each of the second walls 34S is further divided into an upstream wall 34SA located upstream in the flow direction of the first fluid and a downstream wall 34SB located downstream. The plurality of first walls 34F are parallel to one another at regular intervals. The plurality of upstream walls 34SA and downstream walls 34SB are also parallel to one another at the same intervals as the first walls 34F.

[0040] The first wall 34F extends in the axial direction of the inner cylinder 40 (the direction of arrow Z) and also extends in the up-down direction. The first wall 34F has the same number of fitting grooves 58 as the second wall 34S formed therein, from the upstream and downstream sides. Furthermore, the same number of fitting grooves 60 as the first wall 34F are formed from the downstream side of the upstream wall 34SA and from the upstream side of the downstream wall 34SB. The upstream wall 34SA is fitted to the first wall 34F via the fitting grooves 58, 60 on the upstream side of the first wall 34F, and the downstream wall 34SB is fitted to the first wall 34F via the fitting grooves 58, 60 on the downstream side of the first wall 34F. As a result, when viewed in the flow direction of the first fluid, the first wall 34F and the second wall 34S intersect at right angles at intersections 34C (portions joined in a "+" shape), and the heat transfer wall 34 has a rectangular (square in the illustrated example) lattice-like structure. That is, inside the inner cylinder 40, each region partitioned in a grid pattern by the heat transfer wall 34 becomes a flow path through which the first fluid actually flows. In this state, the fitting grooves 58, 60 are joined without any gaps, and the first wall 34F and the second wall 34S are integrated. In addition, the downstream end of the upstream wall 34SA and the upstream end of the downstream wall 34SB are also in contact with each other without any gaps. The intersection 34C is the portion where the first wall 34F and the second wall 34S are fitted together by the fitting grooves 58, 60, and can also be referred to as a fitting portion.

[0041] 3 and 8, a plurality of first protrusions 62T are formed on the top, bottom, and side edges of the first wall 34F, and a spacer 63 protrudes from each of the first protrusions 62T. Furthermore, a second protrusion 64T is formed from each of the spacers 63. The first protrusions 62T and the second protrusions 64T are examples of locking protrusions of the disclosed technology.

[0042] 3 and 9, the inner tube upper plate 40U, the inner tube lower plate 40L, and the inner tube side plate 40S are formed with first recesses 62U corresponding to the first protrusions 62T. Also, the outer tube upper plate 42U, the outer tube lower plate 42L, and the outer tube side plate 42S are formed with second recesses 64U corresponding to the second protrusions 64T. The first recesses 62U and the second recesses 64U are examples of locking recesses of the disclosed technology.

[0043] The first convex portion 62T and the first concave portion 62U form the locking member 36 of the disclosed technology. Similarly, the second convex portion 64T and the second concave portion 64U form the locking member 36 of the disclosed technology.

[0044] The first recess 62U is formed by penetrating the inner tube upper plate 40U, the inner tube lower plate 40L, and the inner tube side plate 40S in a predetermined shape. Similarly, the second recess 64U is formed by penetrating the outer tube upper plate 42U, the outer tube lower plate 42L, and the outer tube side plate 42S in a predetermined shape in the plate thickness direction.

[0045] The first protrusion 62T and the second protrusion 64T are formed by partially protruding the upper side, lower side, and lateral side of the first wall 34F in the in-plane direction.

[0046] 9 and 10, the first protrusion 62T is fitted into the second recess 64U. In this fitted state, a gap 66 is defined between the first protrusion 62T and the first recess 62U in the direction of arrow Z. This gap 66 allows the inner tube upper plate 40U, the inner tube lower plate 40L, and the inner tube side plate 40S to move in the direction of arrow Z relative to the first wall 34F.

[0047] The second protrusion 64T is fitted into the second recess 64U. In this fitted state, a gap 66 is also defined between the second protrusion 64T and the second recess 64U in the direction of arrow Z. This gap 66 allows the outer tube upper plate 42U, the outer tube lower plate 42L, and the outer tube side plate 42S to move in the direction of arrow Z relative to the first wall 34F.

[0048] 12 shows the position (gap defining position GP) that defines the gap 66. As can be seen from this Fig. 12, the gap defining position GP is set at a position where the heat transfer wall 34 (the first wall 34F and the second wall 34S) is joined to the inner cylinder 40 or the outer cylinder 42.

[0049] In the direction of arrow X, no such gap is formed between the first convex portion 62T and the first concave portion 62U, and between the second convex portion 64T and the second concave portion 64U. Therefore, the inner tube upper plate 40U, the inner tube lower plate 40L, the outer tube upper plate 42U, and the outer tube lower plate 42L are unable to move relative to the first wall 34F in the direction of arrow X. In addition, the inner tube side plate 40S and the outer tube side plate 42S are unable to move relative to the first wall 34F in the direction of arrow X.

[0050] 10, clamping claws 68 protrude from the first protrusion 62T and the second protrusion 64T. The clamping claws 68 are an example of a clamping member of the disclosed technology.

[0051] 11A and 11B, the clamping claws 68 of the first protrusion 62T have bent portions that protrude from the first protrusion 62T. The clamping claws 68 clamp the inner tube upper plate 40U, the inner tube lower plate 40L, or the inner tube side plate 40S between themselves and the first wall 34F. This restricts relative movement between the inner tube upper plate 40U and the inner tube lower plate 40L and the first wall 34F in the direction of arrow Y. Furthermore, relative movement between the inner tube side plate 40S and the first wall 34F in the direction of arrow X is restricted. However, these relative movements are permitted within the range of elastic deformation of the clamping claws 68.

[0052] Similarly, the clamping claws 68 of the second protrusion 64T have bent portions protruding from the second protrusion 64T. The clamping claws 68 clamp the outer tube upper plate 42U, the outer tube lower plate 42L, or the outer tube side plate 42S between themselves and the first wall 34F (specifically, the spacer 63). This limits the relative movement between the outer tube upper plate 42U or the outer tube lower plate 42L and the first wall 34F in the direction of arrow Y. Furthermore, the relative movement between the outer tube side plate 42S and the first wall 34F in the direction of arrow X is also limited. However, these relative movements are permitted within the range of elastic deformation of the clamping claws 68.

[0053] As shown in Figures 13 and 14A, a plurality of slits 70 are formed at predetermined positions in the inner cylinder upper plate 40U. Furthermore, as shown in Figures 15 and 16A, a plurality of slits 72 are also formed at predetermined positions in the outer cylinder upper plate 42U. Furthermore, as shown in Figures 6 and 8B, a plurality of slits 74 are also formed at predetermined positions in the second wall 34S (the upstream wall 34SA and the downstream wall 34SB).

[0054] Specifically, as can be seen from Fig. 13, the inner cylinder upper plate 40U has a total of 12 slits 70, four on each side in the width direction and two on each side in the length direction. Then, as shown in Fig. 14B, before the heat exchanger 30 is brazed, the brazing material 38 is applied in advance to the upper sides of these slits 70.

[0055] 15, the outer cylinder upper plate 42U has four slits on each side in the width direction, for a total of eight slits 72. Then, as shown in FIG. 16B, for example, before the heat exchanger 30 is brazed, the brazing material 38 is applied in advance to the upper sides of these slits 72.

[0056] 20B, slits 74 are formed in the second wall 34S (upstream wall 34SA and downstream wall 34SB) along the axial direction (direction of arrow Z) at locations where the first wall 34F is located above and below. In this embodiment, as shown in FIG. 8B, the number of slits 74 in each of the upstream wall 34SA and downstream wall 34SB is the same as that of the first wall 34F in the width direction, and is divided into two in the longitudinal direction.

[0057] 20B, the width W1 of the slit 74 is shorter than the thickness T1 of the first wall 34F. Before the heat exchanger 30 is brazed, the brazing material 38 is applied in advance to the upper surfaces of the upstream wall 34SA and the downstream wall 34SB, as well as to both sides of the slits 74 (both sides of the first wall 34F). A small gap SG is formed between the upper surfaces of the first wall 34F and the second wall 34S.

[0058] When the brazing material 38 melts during the brazing of the heat exchanger 30, the molten brazing material 38 flows through the slits 70 and joins the inner cylinder side plate 40S and the cover plate 46 to the inner cylinder upper plate 40U below the slits 70. Furthermore, this brazing material 38 also enters the slits 70 and closes them.

[0059] When the brazing material 38 melts during the brazing of the heat exchanger 30, the molten brazing material 38 flows through the slits 72 and joins the outer cylinder side plate 42S and the outer upper plate 42U, which are located below the slits 72. Furthermore, this brazing material enters the slits 72 and closes the slits 72 as well.

[0060] In addition, when the brazing material 38 on both sides of the slit 74 (both sides of the first wall 34F) becomes molten during brazing of the heat exchanger 30, the molten brazing material 38 flows through the minute gap SG between the upper surfaces of the first wall 34F and the second wall 34S and reaches the inside of the slit 74, as shown in FIG. 20C. Then, as shown in FIG. 20D, the brazing material 38 that has reached the slit 74 is present in the minute gap SG and joins the first wall 34F and the second wall 34S at the intersection 34C of the first wall 34F and the second wall 34S. Furthermore, the slit 74 is filled with the brazing material 38, and the brazing material 38 closes the slit 74.

[0061] 19, the brazing filler metal 38 is also applied, for example, to the upper side of a slit 70 located above the cover plate 46 in the inner cylinder upper plate 40U. In other words, the brazing filler metal 38 is applied above the brazing locations when brazing the components that make up the heat exchanger 30. The brazing filler metal 38 is applied to the slits 70, 72, and 74 at positions where it can melt when heated and flow down through the slits to join two components to be joined.

[0062] 20A shows a specific example of a position (brazing material application position CP) at which the brazing material 38 is applied. The brazing material 38 is applied to the positions of the slits 70 and 72 described above. In addition, the brazing material 38 is also applied to an intersection 34C (see FIG. 20B) between the first wall 34F and the second wall 34S, and to each portion where the second wall 34S and the outer cylinder side plate 42S or the inner cylinder side plate 40S are joined in a "T" shape, before the heat exchanger 30 is brazed.

[0063] Next, the operation of the heat exchanger 30 of this embodiment and a method for manufacturing the heat exchanger 30 will be described.

[0064] In the manufacturing method of the heat exchanger 30, the heat transfer wall 34 is joined to the inside of the inner cylinder 40 with brazing material 38 to the cylinder body 32 formed by assembling and fixing the inner cylinder 40 and the outer cylinder 42. The heat transfer wall 34 is formed in a lattice shape by fitting a first wall 34F and a second wall 34S (upstream wall 34SA and downstream wall 34SB) together through fitting grooves 58, 60.

[0065] As shown in Fig. 20A, the brazing filler metal 38 is applied to the brazing filler metal application position CP. The brazing filler metal application position CP includes the upper sides of the slits 70, 72, and as shown in Figs. 14B and 16B, the brazing filler metal 38 is applied to the upper parts of the slits 70, 72 so as to cover the slits 70, 72.

[0066] In this state, the heat transfer wall 34 is disposed at a predetermined position on the inner tube 40, the first protrusion 62T is fitted into the first recess 62U, and the second protrusion 64T is fitted into the second recess 64U. Furthermore, the tip ends of the clamping claws 68 are bent. As shown in FIGS. 9 and 10 , the clamping claws 68 of the first protrusion 62T clamp the inner tube upper plate 40U, the inner tube lower plate 40L, or the inner tube side plate 40S between themselves and the first protrusion 62T. Furthermore, the clamping claws 68 of the second protrusion 64T clamp the outer tube upper plate 42U, the outer tube lower plate 42L, or the outer tube side plate 42S between themselves and the second protrusion 64T. The gaps 66 allow relative movement between the inner tube upper plate 40U, the inner tube lower plate 40L, and the inner tube side plate 40S and the heat transfer wall 34. Similarly, the gaps 66 allow relative movement between the outer cylinder upper plate 42U, the outer cylinder lower plate 42L, and the outer cylinder side plate 42S and the heat transfer wall 34. That is, the lattice-shaped heat transfer wall 34 is temporarily fixed inside the inner cylinder 40.

[0067] Then, the entire cylindrical body 32 and heat transfer wall 34 are placed in, for example, a furnace and subjected to a heat treatment to melt the brazing material 38. During heating, the outer cylinder 42, inner cylinder 40, and heat transfer wall 34 expand. In the furnace, heat acts from the outside of the heat exchanger 30. Temperature unevenness occurs in the outer cylinder 42, inner cylinder 40, and heat transfer wall 34, and the outer cylinder 42, inner cylinder 40, and heat transfer wall 34 thermally expand in this order. In other words, a time difference occurs in the amount of thermal expansion between the outer cylinder 42, inner cylinder 40, and heat transfer wall 34.

[0068] In this embodiment, as described above, a gap 66 is defined between the first convex portion 62T and the first concave portion 62U, so the inner tube upper plate 40U, the inner tube lower plate 40L, and the inner tube side plate 40S are movable in the direction of arrow Z relative to the first wall 34F. Furthermore, a gap 66 is defined between the second convex portion 64T and the second concave portion 64U in the direction of arrow Z, so the outer tube upper plate 42U, the outer tube lower plate 42L, and the outer tube side plate 42S are movable in the direction of arrow Z relative to the first wall 34F.

[0069] Therefore, when the outer cylinder upper plate 42U, the outer cylinder lower plate 42L, and the outer cylinder side plate 42S thermally expand in the direction of arrow Z, the gap 66 allows relative movement between the outer cylinder upper plate 42U, the outer cylinder lower plate 42L, and the outer cylinder side plate 42S and the first wall 34F. Also, when the inner cylinder upper plate 40U, the inner cylinder lower plate 40L, and the inner cylinder side plate 40S thermally expand in the direction of arrow Z, the gap 66 allows relative movement between the inner cylinder upper plate 40U, the inner cylinder lower plate 40L, and the inner cylinder side plate 40S and the first wall 34F.

[0070] Then, when each component of the heat exchanger 30 reaches the melting temperature of the brazing material 38 and reaches the same temperature, the components thermally expand to the same extent, and the gap 66 returns to its initial state.

[0071] At this time, when the brazing filler metal 38 applied to the upper sides of the slits 70, 72 becomes molten, it passes through the slits 70, 72 and reaches the underlying member. The brazing filler metal 38 can join (braze) the respective members (the member in which the slits 70, 72 are formed and the member below it). The slits 70, 72 are also filled with the brazing filler metal 38. Because the brazing filler metal 38 closes the slits 70, 72, the airtightness and rigidity of the heat exchanger 30 are ensured.

[0072] When the brazing filler metal 38 applied to the intersection 34C between the first wall 34F and the second wall 34S becomes molten, it flows through the minute gap SG between the upper surfaces of the first wall 34F and the second wall 34S, passes through the slit 74, and reaches the lower portions of the first wall 34F and the second wall 34S. The brazing filler metal 38 joins the first wall 34F and the second wall 34S at the intersection 34C, and the relative positions of the first wall 34F and the second wall 34S are maintained constant. The slit 74 is also filled with the brazing filler metal 38. Because the brazing filler metal 38 closes the slit 74, the thermal conductivity and stiffness of the heat exchanger 30 are ensured.

[0073] As described above, in this embodiment, the locking members 36 (the first convex portions 62T and the first concave portions 62U, and the second convex portions 64T and the second concave portions 64U) temporarily fix the heat transfer wall 34 and the outer casing 42, and the heat transfer wall 34 and the inner casing 40, with the gap 66 remaining. When the heat exchanger 30 is heated to melt the brazing filler metal 38, the gap 66 can absorb the difference in thermal expansion between the outer casing 42 and the heat transfer wall 34, and between the inner casing 40 and the heat transfer wall 34. This can suppress deformation of the outer casing 42, the inner casing 40, and the heat transfer wall 34, and peeling of the brazing filler metal 38, and can suppress deterioration in the quality of the heat exchanger 30. Furthermore, in the manufacturing process of the heat exchanger 30, the entire heat exchanger 30 is placed in a furnace, and the outer tube 42 and the heat transfer wall 34, the inner tube 40 and the heat transfer wall 34, and the intersecting heat transfer walls 34 (first wall 34F and second wall 34S) are efficiently joined together to manufacture the heat exchanger 30.

[0074] In the above example, the locking recesses (first recess 62U and second recess 64U) are formed in the outer cylinder upper plate 42U that constitutes the outer cylinder 42 and the inner cylinder upper plate 40U that constitutes the inner cylinder 40, and the locking protrusions (first protrusion 62T and second protrusion 64T) are formed in the first wall 34F that constitutes the heat transfer wall 34. This allows the first recess 62U and the second recess 64U to be formed with a simple structure that partially penetrates the outer cylinder upper plate 42U and the inner cylinder upper plate 40U in the plate thickness direction. Furthermore, the first protrusion 62T and the second protrusion 64T can be formed with a simple structure that protrudes the edge of the first wall 34F in an in-plane direction.

[0075] In the above embodiment, the clamping claws 68 are an example of a clamping member. The clamping claws 68 formed on the first protrusions 62T clamp the inner tube upper plate 40U, the inner tube lower plate 40L, and the inner tube side plate 40S between themselves and the first protrusions 62T. This prevents the inner tube upper plate 40U, the inner tube lower plate 40L, and the inner tube side plate 40S from moving in the plate thickness direction and disengaging the first recess 62U from the first protrusions 62T. The tip sides of the clamping claws 68 are elastically deformable, so that movement in the plate thickness direction of the inner tube upper plate 40U, the inner tube lower plate 40L, and the inner tube side plate 40S is permitted within the range of elastic deformation.

[0076] The clamping claws 68 formed on the second protrusion 64T clamp the outer tube upper plate 42U, the outer tube lower plate 42L, and the outer tube side plate 42S between themselves and the second protrusion 64T. This prevents the outer tube upper plate 42U, the outer tube lower plate 42L, and the outer tube side plate 42S from moving in the plate thickness direction and disengaging the second recess 64U from the second protrusion 64T. Because the tip side of the clamping claws 68 is elastically deformable, movement in the plate thickness direction of the outer tube upper plate 42U, the outer tube lower plate 42L, and the outer tube side plate 42S is permitted within the range of elastic deformation.

[0077] The clamping claws 68 are an example of a clamping member of the disclosed technology. In addition to the clamping claws 68, the following modified configurations can be exemplified as clamping members. Note that in the following modified configurations, the portion where the clamping member is provided is exemplified as the portion where the first recess 62U is formed in the inner tube upper plate 40U, but the portion where the clamping member is provided is not limited to this and may be any portion similar to the clamping claws 68 of the first embodiment.

[0078] In a first modified example shown in FIGS. 21A and 21B, the clamping member is a tapered pin 76. Both longitudinal ends of the second recess 64U are curved semicircularly. The tapered pin 76 has a truncated cone shape, and its lower end (thinner side) in FIG. 21B is press-fitted into a press-fit hole 78 formed in the first wall 34F (spacer 63). In this state, the middle portion of the tapered pin 76 is engaged with the second recess 64U. That is, in the first modified example, the tapered pin 76 also serves as the second protrusion 64T. A gap 66 is defined between the tapered pin 76 and the second recess 64U. The upper end (thicker side) in FIG. 21B clamps the outer cylinder upper plate 42U between itself and the first wall 34F (spacer 63).

[0079] In a second modified example shown in Figures 22A and 22B, the clamping member is a bolt 80. The male thread of the bolt 80 is screwed into the female thread 82 formed in the first wall 34F (spacer 63). In this state, the middle portion of the bolt 80 is engaged with the second recess 64U. In the second modified example, the bolt 80 also serves as the second protrusion 64T. A gap 66 is formed between the bolt 80 and the second recess 64U. The head of the bolt 80 clamps the outer cylinder upper plate 42U between itself and the first wall 34F.

[0080] In a third modified example shown in Figures 23A and 23B, the clamping member is a rivet 84. The body of the rivet 84 is press-fit into a press-fit hole 78 formed in the first wall 34F (spacer 63). The tip (opposite the head) of the rivet 84 is not crimped. In this state, the middle portion of the body of the rivet 84 is engaged in the second recess 64U. In the third modified example, the rivet 84 also serves as the second protrusion 64T. A gap 66 is defined between the body of the rivet 84 and the second recess 64U. The head of the rivet 84 clamps the outer cylinder upper plate 42U between itself and the first wall 34F.

[0081] 24A and 24B, the second protrusion 64T is formed long so as to protrude upward from the outer tube upper plate 42U. A fastener 88 is fitted into a groove 86 formed in this protrusion. In essence, the diameter of the second protrusion 64T is increased by the fastener 88. In the fourth modified example, the clamping member is the fastener 88, and the outer tube upper plate 42U is clamped between the fastener 88 and the first wall 34F.

[0082] In this way, the specific structure of the clamping member of the disclosed technology is not limited, and various structures can be adopted.

[0083] Next, a second embodiment will be described. In the second embodiment, the same elements, members, etc. as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed descriptions thereof will be omitted.

[0084] 25 and 26, a heat exchanger 90 of the second embodiment is provided with a tubular passage 92 that continues from a first inlet tube 48F to a first outlet tube 48S. The first fluid flows from the first inlet tube 48F into the tubular passage 92 and flows out of the first outlet tube 48S.

[0085] Furthermore, in the heat exchanger 90 of the second embodiment, a second inlet tube 50F is provided on the upstream cover plate 46, and a second outlet tube 50S is provided on the downstream cover plate 46. The second fluid flows into the inner tube 40 from the second inlet and flows out from the second outlet tube 50S.

[0086] Additionally, in the heat exchanger 90 of the second embodiment, a third inlet tube 94F is provided in the outer casing 42 (for example, the outer casing upper plate 42U), and a third outlet tube 94S is provided at another position in the outer casing 42 (for example, the outer casing lower plate 42L). The third fluid flows from the third inlet tube 94F into the gap 44 and is discharged from the third outlet tube 94S.

[0087] Therefore, the heat exchanger 90 of the second embodiment is capable of heat exchange between the third fluid and the second fluid, and further capable of heat exchange between the second fluid and the first fluid. It is also possible to allow the heat of the third fluid to act on the second fluid and then act on the first fluid.

[0088] In the disclosed technology, the heat transfer wall 34 has been exemplified as having the first wall 34F and the second wall 34S, but the heat transfer wall 34 may be composed of only the first wall 34F or the second wall 34S. By using the first wall 34F and the second wall 34S and assembling them in a lattice pattern, the inside of the inner cylinder 40 can be efficiently divided into a plurality of flow paths.

[0089] Furthermore, the following notes are disclosed: (Appendix 1) a cylindrical body including an inner cylinder and an outer cylinder, with a gap formed between the inner cylinder and the outer cylinder; a heat transfer wall extending in the axial direction of the inner cylinder inside the inner cylinder and joined to the inner cylinder; a locking member that locks the outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall, with a gap in the axial direction; a brazing material for joining the outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall; A heat exchanger having: (Appendix 2) The heat transfer wall is a plurality of first walls extending in a first direction perpendicular to the axial direction and parallel to each other; a plurality of second walls extending in a second direction perpendicular to the axial direction and the first direction, parallel to each other, and intersecting with the first wall at intersections; 2. The heat exchanger of claim 1, comprising: (Appendix 3) 3. The heat exchanger according to claim 2, wherein the brazing material joins the first wall and the second wall at the intersection. (Appendix 4) The locking member is a locking recess formed in one of the outer cylinder, the inner cylinder, and the heat transfer wall; a locking protrusion formed on the other of the outer cylinder, the inner cylinder, and the heat transfer wall, and fitted into the locking recess with the gap therebetween; 4. The heat exchanger of claim 3, comprising: (Appendix 5) The heat exchanger described in Appendix 4, wherein the locking member includes a clamping member that protrudes from the locking protrusion and clamps the outer tube or the inner tube at the protruding end side between the outer tube, the inner tube, and the heat transfer wall on which the locking protrusion is formed. (Appendix 6) 6. The heat exchanger according to claim 5, wherein the clamping member is a clamping claw whose protruding portion from the locking protrusion is bent to contact one of the outer tube and the inner tube and the heat transfer wall. (Appendix 7) 7. The heat exchanger according to any one of claims 2 to 6, further comprising a slit formed below the brazing material in the outer cylinder, the inner cylinder and the intersection. (Appendix 8) 8. The heat exchanger of claim 7, wherein the brazing material closes the slit. (Appendix 9) A cylindrical body including an inner cylinder and an outer cylinder, with a gap formed between the inner cylinder and the outer cylinder, a heat transfer wall extending in an axial direction of the inner cylinder is disposed inside the inner cylinder; The outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall are locked with a locking member with a gap in the axial direction, The outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall are joined together using a brazing material. Heat exchanger manufacturing method. (Appendix 10) The heat transfer wall is a plurality of first walls extending in a first direction perpendicular to the axial direction and parallel to each other; a plurality of second walls extending in a second direction perpendicular to the axial direction and the first direction, parallel to each other, and intersecting with the first wall at intersections; 10. The heat exchanger manufacturing method according to claim 9, wherein the first wall and the second wall are joined at the intersection with the brazing material. [Explanation of symbols]

[0090] 30 heat exchanger 32 Cylinder 34 Heat Transfer Wall 34F First wall 34S second wall 34SA upstream wall 34SB downstream wall 34C intersection 36 Locking member 38 Brazing material 40 Inner cylinder 40L inner cylinder lower plate 40S inner cylinder side plate 40U Inner cylinder upper plate 42 outer cylinder 42L outer cylinder lower plate 42S outer cylinder side plate 42U Outer cylinder upper plate 44 void 46 Lid plate 48F First inlet pipe 48S First outlet pipe 50F 2nd inlet pipe 50S second outlet pipe 52 Lid plate 54T fixed protrusion 54U Fixing recess 56 Fixed claw 58 Fitting groove 60 Fitting groove 62T First convex part 62U First recess 63 Spacer 64T Second convex part 64U Second recess 66 Gap 68 Clamping claw 70 slit 72 Slit 74 Slit 76 Tapered pin 78 Press-fit hole 80 volts 82 female thread 84 Rivets 86 Groove 88 Fasteners 90 Heat exchanger 92 Flow channel tube 94F Third inlet pipe 94S third outflow tube

Claims

1. a cylindrical body including an inner cylinder and an outer cylinder, with a gap formed between the inner cylinder and the outer cylinder; a heat transfer wall extending in the axial direction of the inner cylinder inside the inner cylinder and joined to the inner cylinder; a locking member that locks the outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall, with a gap in the axial direction; a brazing material for joining the outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall; A heat exchanger having

2. The heat transfer wall is a plurality of first walls extending in a first direction perpendicular to the axial direction and parallel to each other; a plurality of second walls extending in a second direction perpendicular to the axial direction and the first direction, parallel to each other, and intersecting with the first wall at intersections; The heat exchanger of claim 1 , comprising:

3. The heat exchanger according to claim 2 , wherein the brazing material joins the first wall and the second wall at the intersection.

4. The locking member is a locking recess formed in one of the outer cylinder, the inner cylinder, and the heat transfer wall; a locking protrusion formed on the other of the outer cylinder, the inner cylinder, and the heat transfer wall, and fitted into the locking recess with the gap therebetween; 4. The heat exchanger of claim 3, comprising:

5. 5. The heat exchanger according to claim 4, wherein the locking member includes a clamping member that protrudes from the locking protrusion and clamps the outer tube or the inner tube at the protruding end side between the outer tube, the inner tube, and the heat transfer wall on which the locking protrusion is formed.

6. 6. The heat exchanger according to claim 5, wherein the clamping members are clamping claws whose protruding portions from the locking projections are bent to come into contact with one of the outer and inner cylinders and the heat transfer wall.

7. 3. The heat exchanger according to claim 2, further comprising a slit formed below the brazing material in the outer cylinder, the inner cylinder and the intersection.

8. 8. The heat exchanger of claim 7, wherein the brazing material closes the slits.

9. A cylindrical body including an inner cylinder and an outer cylinder, with a gap formed between the inner cylinder and the outer cylinder, a heat transfer wall extending in an axial direction of the inner cylinder is disposed inside the inner cylinder; The outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall are locked with a locking member with a gap in the axial direction, The outer cylinder and the heat transfer wall, and the inner cylinder and the heat transfer wall are joined together using a brazing material. Heat exchanger manufacturing method.

10. The heat transfer wall is a plurality of first walls extending in a first direction perpendicular to the axial direction and parallel to each other; a plurality of second walls extending in a second direction perpendicular to the axial direction and the first direction, parallel to each other, and intersecting with the first wall at intersections; The method for manufacturing a heat exchanger according to claim 9 , wherein the first wall and the second wall are joined together at the intersection with the brazing material.

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