heat exchanger

Abstract

To obtain a heat exchanger that suppresses the leakage of a fluid from a space between a baffle plate and a shell, and facilitates manufacturing.SOLUTION: A heat exchanger 10 includes: a shell body 12 that is equipped with a shell upper part 12U as a cylindrical member, a shell intermediate part 12M, and a shell lower part 12L, eliminates a clearance between the cylindrical member and a baffle plate 28 by sandwiching an outer edge portion of the baffle plate 28 at an opening edge portion of the cylindrical member adjacent in an axial direction, and is formed with a plurality of rooms by the baffle plate 28; an upper flange 14 and a lower flange 16 that close opening portions of the cylindrical member at both end portions; a heat transfer tube 30 that penetrates the shell body 12 and in which a first fluid flows; heat medium piping 50 that flows a second fluid into a room on one side of the shell body 12; heat medium piping 50 that flows out the second fluid from a room on the other side of the shell body 12; and an opening portion 54 that is formed on the baffle plate 28 and enables passage of the second fluid from one adjacent room to another room.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] One type of heat exchanger is called a shell-and-tube heat exchanger, which has multiple tubes housed inside a cylindrical shell and circular baffle plates arranged at predetermined intervals perpendicular to the longitudinal direction of the shell and tubes, and exchanges heat between a fluid flowing inside the tubes and a fluid flowing outside the tubes inside the shell.

[0003] In conventional shell-and-tube heat exchangers, where the baffle plate is installed inside the shell, the outer diameter of the baffle plate is made smaller than the inner diameter of the shell, resulting in a gap between the shell and the baffle plate. If there is a gap between the shell and the baffle plate, fluid will bypass and flow through the gap (so-called leak flow), which causes a problem of reduced heat exchange efficiency of the heat exchanger. To solve this problem, a shell-and-tube heat exchanger has been proposed in which a seal plate that closes the gap between the shell and the baffle plate is attached by welding to the inner surface of the shell (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 08-334293 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when a seal plate for preventing leak flow is attached by welding to the inner surface of the shell, for example, in the case of a large heat exchanger with an inner shell diameter of more than 2500 mm, a welding worker can enter the shell and weld the seal plate to the longitudinal center of the heat exchanger.

[0006] However, in small heat exchangers, where welding workers cannot enter the shell, welding at the center of the longitudinal direction is difficult, and therefore, it is difficult to eliminate the gap between the shell and the baffle plate in small heat exchangers.

[0007] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a heat exchanger that suppresses leakage of fluid from between the baffle plate and the shell and is easy to manufacture. [Means for solving the problem]

[0008] No. 1 Aspects the heat exchanger includes a shell body having a plurality of cylindrical members, the outer edge of a baffle plate being sandwiched between the opening edges of the cylindrical members adjacent in the axial direction to eliminate a gap between the cylindrical members and the baffle plate, the shell body having a plurality of chambers formed by the baffle plate, two flanges that close the openings of the cylindrical members at both ends of the shell body, a heat transfer tube that penetrates the plurality of baffle plates and the flanges and is provided inside the shell body, through which a first fluid flows in from the outside of the flange on one side and flows out to the outside of the flange on the other side, a second inlet portion that penetrates the outer peripheral wall of the shell body and flows a second fluid into the chamber on one side of the shell body, and a second outlet portion that penetrates the outer peripheral wall of the shell body and flows out the second fluid from the chamber on the other side of the shell body, and an opening for allowing the second fluid to pass from one adjacent chamber to another adjacent chamber.

[0009] No. 1 AspectsIn this heat exchanger, multiple chambers are formed inside the shell body by baffle plates, and the chambers of adjacent cylindrical members are connected to the chambers of the other cylindrical member through openings formed in the baffle plates. When a second fluid is caused to flow into the chamber on one side of the shell body from the second inlet portion of the shell body, the second fluid flows through each chamber in turn through the openings of each baffle plate, allowing the second fluid to flow out of the chamber on the other side of the shell body.

[0010] By allowing a first fluid to flow in from one end of the heat transfer tube and a second fluid to flow in from the second inlet of the shell body, efficient heat exchange can be achieved between the second fluid flowing inside the shell body and the first fluid flowing inside the heat transfer tube.

[0011] No. 1 Aspects The shell body of the heat exchanger has the outer edge of the baffle plate sandwiched between the opening edges of the axially adjacent tubular members, eliminating any gaps between the tubular members and the baffle plate, and the baffle plate forms multiple chambers.This prevents the second fluid from leaking between the baffle plate and the tubular members, and prevents the second fluid from flowing from the chamber of one tubular member to the inner chamber of the other tubular member without passing through the openings formed in the baffle plate, allowing for efficient heat exchange. Furthermore, since it is not necessary to braze or weld the baffle plate to the cylindrical member from the inside of the cylindrical member, manufacturing is easier.

[0012] No. 2 Aspects The invention of No. 1 Aspects In the heat exchanger, both ends of the heat transfer tube are formed with crimped portions that are crimped to the flanges to introduce tensile force into the heat transfer tube, and the cylindrical member and the baffle plate are in contact with each other in a pressurized state between one flange and the other flange.

[0013] No. 2 AspectsIn the heat exchanger, the crimped portions formed on both ends of the heat transfer tubes are crimped to the flanges to apply tension to the heat transfer tubes, which applies a compressive force between the cylindrical member and the baffle plate, bringing the cylindrical member and the baffle plate into contact with each other under pressure between one flange and the other flange, improving adhesion and further suppressing leakage of the second fluid inside the shell body. Furthermore, by forming crimped portions at both ends of the heat transfer tube, multiple tubular members and multiple baffle plates can be sandwiched between the two flanges for temporary assembly, which makes it easier to join the members together using a joining material such as brazing material.

[0014] No. 3 Aspects The invention of No. 2 Aspects In the heat exchanger of the above, the opening edge of the cylindrical member abuts against a baffle plate.

[0015] No. 3 Aspects In this heat exchanger, when the opening edge of the cylindrical member is abutted against the baffle plate, a compressive force is applied between the cylindrical member and the baffle plate, thereby suppressing leakage of the second fluid from between the cylindrical member and the baffle plate.

[0016] No. 4 Aspects The invention of No. 2 Aspects In the heat exchanger, the outer periphery of the opening edge on one side of the tubular member is formed with a step that expands radially and then rises axially to receive the outer edge of the baffle plate and the opening edge on the other side of the tubular member, and the baffle plate is sandwiched between the radially expanded part and the opening edge on the other side of another adjacent tubular member.

[0017] No. 4 Aspects In the heat exchanger, the expanded diameter portion of one cylindrical member is attached to one surface of the baffle plate. When the opening edge of the other cylindrical member contacts the other surface of the baffle plate and the opening edge of the other cylindrical member contacts the other surface of the baffle plate, a compressive force is applied between the cylindrical member and the baffle plate, thereby suppressing leakage of the second fluid from between the cylindrical member and the baffle plate. Furthermore, a step formed on the opening edge on one side of one tubular member supports the baffle plate and the opening edge on the other side of the other tubular member, so that multiple tubular members and baffle plates can be connected without shifting in a direction intersecting the axial direction, in other words, in the radial direction.

[0018] No. 5 Aspects The invention of No. 2 Aspects In the heat exchanger of the present invention, the shell body comprises an outer shell fitted onto the outside of the tubular member and the baffle plate, and the two flanges close the openings of the tubular member at both ends of the shell body, respectively, and also close the openings at both ends of the outer shell.

[0019] No. 5 Aspects In this heat exchanger, the opening of the outer shell that houses the tubular member and the baffle plate is closed with a flange, and a compressive force is applied to the flange, thereby suppressing leakage of the second fluid from between the outer shell and the flange to the outside of the heat exchanger.

[0020] No. 6 Aspects The invention of No. 2 Aspects ~ No. 4 Aspects Any one of Aspects In the heat exchanger of the present invention, the contact portions between the cylindrical member and the baffle plate, the contact portions between the flange and the cylindrical member, and the contact portions between the heat transfer tubes and the flange are joined using joining members.

[0021] No. 6 AspectsIn this heat exchanger, the contact areas between the cylindrical member and the baffle plate, the contact areas between the flange and the cylindrical member, and the contact areas between the heat transfer tube and the flange are joined using joining members, so that even small gaps at the contact areas can be sealed with the joining members, thereby reliably suppressing leakage of the second fluid. No. 6 Aspects This heat exchanger is particularly preferable when the second fluid is a liquid, since it can reliably prevent the liquid from leaking outside the heat exchanger.

[0022] No. 7 Aspects The invention of No. 5 Aspects In the heat exchanger of the above, the contact portions between the flange and the outer shell and the contact portions between the heat transfer tube and the flange are joined using joining members.

[0023] No. 7 Aspects In this heat exchanger, the contact areas between the flange and the outer shell, and the contact areas between the heat transfer tube and the flange are joined using joining members, so that even small gaps at the contact areas can be sealed with the joining members, thereby reliably preventing leakage of the second fluid outside the heat exchanger. No. 7 Aspects This heat exchanger is particularly preferable when the second fluid is a liquid, since it can reliably prevent the liquid from leaking outside the heat exchanger. [Effects of the Invention]

[0024] As described above, the heat exchanger of the present invention has the excellent effects of suppressing leakage of fluid from between the baffle plate and the shell and facilitating manufacture. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a cross-sectional view taken along an axis of a heat exchanger according to a first embodiment of the present invention. [Figure 2] 1A is a cross-sectional view of the heat exchanger shown in FIG. 1 taken along line 1A-1A, and FIG. 1B is a cross-sectional view of the heat exchanger shown in FIG. 1 taken along line 1B-1B. [Figure 3] FIG. 4 is a cross-sectional view showing the welded portion between the shell and the baffle plate. [Figure 4] FIG. 5 is a cross-sectional view taken along the axis of a heat exchanger according to a second embodiment of the present invention. [Figure 5] 10(A) and 10(B) are cross-sectional views showing the joints in the middle part of the shell. [Figure 6] FIG. 1 is a plan view of a heat transfer tube, showing a crimped portion of the heat transfer tube, as viewed from the axial direction. [Figure 7] FIG. 10 is a cross-sectional view showing a schematic configuration in which an upper flange, a lower flange, a shell, and a baffle plate are stacked together and heat transfer tubes are inserted. [Figure 8] 1A is a cross-sectional view of a temporary assembly showing a state in which a crimping jig is attached to a heat transfer tube, and FIG. 1B is a plan view showing the crimping jig and the tube as viewed from the axial direction. [Figure 9] FIG. 10 is a cross-sectional view of a temporary assembly showing a state in which the end of the heat transfer tube is crimped. [Figure 10] FIG. 6 is a cross-sectional view taken along the axis of a heat exchanger according to a third embodiment of the present invention. [Figure 11] FIG. 10 is a cross-sectional view showing a joint portion of a shell body in a heat exchanger according to a fourth embodiment of the present invention. [Figure 12] FIG. 4 is a cross-sectional view taken along the axis of a heat exchanger according to a modified example of the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] [First embodiment] A heat exchanger 10 according to a first embodiment of the present invention will be described with reference to Figures 1 to 4. In the drawings, arrow U indicates the upward direction, and arrow D indicates the downward direction. As shown in FIG. 1, the heat exchanger 10 of this embodiment is a so-called shell-and-tube type heat exchanger, and is composed of a shell body 12, an upper flange 14, a lower flange 16, an upper lid 18, a lower lid 20, a spacer 22, a sealing material 24, a flow plate 26, a baffle plate 28, heat transfer tubes 30, etc. Furthermore, the shell body 12 of this embodiment is formed by joining an upper shell portion 12U, a middle shell portion 12M, and a lower shell portion 12L, which are examples of cylindrical members.

[0027] The heat exchanger 10 of this embodiment is disposed so that the axial direction is vertical and the upper lid 18 is on the upper side, but it may also be disposed so that the axial direction is horizontal or inclined relative to the horizontal.

[0028] (Upper flange, lower flange) The upper flange 14 and the lower flange 16 have the same configuration, so the upper flange 14 will be described as a representative. The upper flange 14 is formed into a disk shape from a metal plate. The upper flange 14 has a plurality of round holes 32 formed in the center, through which the heat transfer tubes 30 pass, and a plurality of small holes 34 formed on the outer periphery, through which bolts 46, described later, are inserted.

[0029] (Top lid, bottom lid) The upper lid 18 and the lower lid 20 have the same configuration, so the upper lid 18 will be described as a representative. The upper lid 18 is made of a metal material and is formed in a funnel shape, with a cylindrical connecting portion 18A formed in the center and an annular flange 18B formed on the outer periphery. A plurality of small holes 36 are formed in the annular flange 18B, through which bolts 46, described below, are inserted.

[0030] (straightening plate) A boss 18D is formed on the inner surface of the truncated cone-shaped portion 18C of the upper cover 18. A disk-shaped rectifying plate 26 having a plurality of fluid passage holes 38 formed therein is fixed to this boss 18D using machine screws 42.

[0031] A ring-shaped spacer 22 is disposed between the upper cover 18 and the upper flange 14. The spacer 22 has a plurality of small holes 44 formed therein, through which bolts 46, which will be described later, are inserted.

[0032] The top cover 18, the top flange 14 and the spacer 22 are fixed to one another by means of bolts 46 and nuts 49 which pass through them.

[0033] Annular grooves 48 are formed on both side surfaces of the spacer 22, and annular seal materials 24 are fitted into these annular grooves 48. The seal materials 24 seal the gaps between the upper cover 18 and the spacer 22, and between the spacer 22 and the upper flange 14, to prevent fluid from leaking.

[0034] Also on the lower side of the heat exchanger 10, the lower cover 20, the lower flange 16, and the spacer 22 are fixed to one another using bolts 46 and nuts 49.

[0035] (Upper shell, middle shell, lower shell) The upper shell portion 12U, the middle shell portion 12M, and the lower shell portion 12L are cylindrical tubular members formed of a metal material. In this embodiment, in order to standardize the materials, the upper shell portion 12U, the middle shell portion 12M, and the lower shell portion 12L are made of the same tubular members (same thickness, diameter, and length). As an example, the upper shell portion 12U, the middle shell portion 12M, and the lower shell portion 12L can be formed by processing a metal plate into a cylindrical shape.

[0036] In this embodiment, the upper shell 12U and the lower shell 12L have the same structure, and a metal heat transfer medium pipe 50 is joined to the outer periphery of each by brazing (in the drawing, reference numeral 52 denotes a brazing material as an example of a joining member). The heat transfer medium pipe 50 is inserted into a hole 53 formed in the outer periphery of the shell and brazed (reference numeral 52 denotes a brazing material).

[0037] The upper end of the upper shell part 12U is joined to the lower surface of the upper flange 14 by brazing (reference numeral 52 denotes a brazing material). Similarly, the lower end of the lower shell part 12L is joined to the upper surface of the lower flange 16 by brazing (reference numeral 52 denotes a brazing material).

[0038] Baffle plates 28 are respectively disposed between the upper shell portion 12U and the middle shell portion 12M, between the middle shell portions 12M and 12M, and between the middle shell portion 12M and the lower shell portion 12L.

[0039] As shown in FIGS. 2A and 2B, the baffle plate 28 is made of a metal material and has a disk shape, and has a crescent-shaped opening on a part of the outer periphery. Department In other portions, a plurality of round holes 56 are formed to allow the heat transfer tubes 30 to pass through.

[0040] As shown in FIG. 1, the baffle plate 28 of this embodiment has an outer diameter larger than that of the upper shell portion 12U, the middle shell portion 12M, and the lower shell portion 12L, and its outer peripheral portion protrudes outward from the outer peripheral surfaces of the upper shell portion 12U, the middle shell portion 12M, and the lower shell portion 12L.

[0041] The outer peripheral surfaces of the upper shell portion 12U, the middle shell portion 12M, and the lower shell portion 12L are joined by brazing (reference numeral 52 denotes a brazing material) to the side portion on the outer peripheral side of the baffle plate 28. In this way, the upper shell portion 12U, the middle shell portion 12M, and the lower shell portion 12L are joined to one another via the baffle plate 28.

[0042] The baffle plates 28 are arranged such that adjacent plates are open. Department 54 are arranged alternately on either side of the central axis CL of the shell body 12. When a fluid (hereinafter referred to as a second fluid) flows in the space between the cylindrical member and the heat transfer tube 30, the second fluid flows in a meandering manner inside the shell body 12 as shown by arrow A. That is, inside the shell body 12, a heat transfer medium flow path 29 is formed in which the second fluid flows in a serpentine manner.

[0043] A plurality of heat transfer tubes 30 are arranged inside the shell body 12 along the axial direction of the shell body 12, and these heat transfer tubes 30 are inserted into the circular holes 56 in each baffle plate 28 and the circular holes 32 in the upper flange 14 and the lower flange 16. It is preferable to make the gap between the circular holes 56 in the baffle plate 28 and the heat transfer tubes 30 as small as possible.

[0044] One end of the heat transfer tube 30 is inserted into the round hole 32 of the upper flange 14 and joined to the upper flange 14 by brazing (reference numeral 52 denotes a brazing material), and the other end of the heat transfer tube 30 is inserted into the round hole 32 of the lower flange 16 and joined to the lower flange 16 by brazing (reference numeral 52 denotes a brazing material).

[0045] As an example, a first fluid that exchanges heat with a second fluid flows inside the heat transfer tube 30.

[0046] In the heat exchanger 10 of this embodiment, SUS304 is used as the metal material for forming each part, but metal materials other than SUS304 may also be used.

[0047] (Action, effect) According to the heat exchanger 10 of this embodiment, the outer peripheral edge of the baffle plate 28 protrudes from the outer peripheral surface of the shell, and the outer peripheral edge of the baffle plate 28 protruding from the outer peripheral surface of the shell is brazed to the outer peripheral surface of the shell, which makes the brazing work easy. Furthermore, the dimensional control of the upper shell portion 12U, the middle shell portion 12M, the lower shell portion 12L, and the baffle plate 28 can be made easier than in a conventional shell-and-tube heat exchanger in which the baffle plate is arranged inside the shell.

[0048] The brazing of each part of the heat exchanger 10 of this embodiment can be performed collectively, for example, in a vacuum heating furnace, which allows the brazing work to be performed efficiently in a short time compared to brazing each part manually. As an example, brazing in a vacuum heating furnace can be performed by temporarily assembling the upper shell part 12U, the middle shell part 12M, the lower shell part 12L, the upper flange 14, the lower flange 16, the heat transfer tubes 30, and the heat medium pipes 50, and then applying a paste containing a brazing material to the parts to be brazed. The temporary assembly can be heated in a vacuum heating furnace. As an example of temporary assembly, the components may be spot-welded together to prevent them from moving.

[0049] Since the work of distributing the paste containing the brazing material can be done from the outside of the temporary assembly, the brazing work can be easily done even on a small temporary assembly that workers cannot enter inside.

[0050] In a vacuum heating furnace, the entire pre-assembled part is heated uniformly, so there is almost no deformation of the parts due to thermal stress caused by heat input to the parts, as occurs in, for example, arc welding or gas welding, and the thickness and rigidity of the parts can be minimized.As a result, it is only necessary to ensure the structural strength according to the operating conditions of the heat exchanger 10 (temperature, pressure, etc.), and each part can be made thin (i.e., have a small heat capacity), thereby reducing heat loss.

[0051] In the heat exchanger 10 of this embodiment, the baffle plate 28 is joined to the upper shell portion 12U, the middle shell portion 12M, or the lower shell portion 12L by brazing. However, as shown in FIG. 3, the outer diameter of the baffle plate 28 may be the same as the outer diameter of the shell, and laser welding (reference numeral 58 indicates the welded portion) may be used instead of brazing. Laser welding has the advantage of being able to heat locally compared to arc welding or gas welding, being able to join in a short time, and having less welding distortion. Although not shown, the brazing of other portions may also be performed by laser welding.

[0052] In the heat exchanger 10, heat exchange can be performed between a first fluid flowing inside the heat transfer tubes 30 and a second fluid flowing outside the heat transfer tubes 30 inside the shell body 12. In the heat exchanger 10, as an example, the first fluid to be heated can be heated by supplying a first medium to the connection portion 18A of the lower cover 20 and supplying a second fluid to the heat medium pipe (second inlet portion) 50 in the shell lower portion 12L. Inside the shell body 12, the second fluid flows in a serpentine manner as indicated by arrow A, which allows for a long contact time between the second fluid and the heat transfer tubes 30 and allows the heat of the second fluid to be sufficiently transferred to the first fluid.

[0053] In a shell-and-tube heat exchanger, the heat exchange capacity is determined by the outer diameter and length of the heat transfer tubes and shell, as well as the number of heat transfer tubes. Therefore, with conventional shell-and-tube heat exchangers, it was necessary to design and manufacture heat exchangers with different outer diameters, lengths, and numbers of tubes for each specification, which was time-consuming and expensive.

[0054] On the other hand, in the structure of the heat exchanger 10 of this embodiment, by increasing or decreasing the number of baffle plates 28 and shell intermediate portions 12M and adjusting the heat transfer tubes 30 to the corresponding length, the heat exchanger performance can be easily adjusted, and heat exchangers 10 with different specifications can be easily manufactured.

[0055] [Second embodiment] A heat exchanger 10 according to a second embodiment of the present invention will be described with reference to Figures 4 to 9. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0056] 4, in the shell intermediate portion 12M and the shell lower portion 12L, a large diameter portion 84 as an example of a step portion is formed on one end side of a small diameter portion 83 formed to have a constant diameter, and the small diameter portion 83 of the adjacent shell upper portion 12U or shell intermediate portion 12M is inserted into this large diameter portion 84 so as to sandwich the baffle plate 28. Note that the baffle plate 28 of this embodiment has a smaller diameter than the baffle plate 28 of the first embodiment and is formed with a diameter that can be inserted into the large diameter portion 84.

[0057] As shown in Fig. 5(A), at the large diameter portion 84 of the shell intermediate portion 12M, one side of the baffle plate 28 is in close contact with the end of the small diameter portion 83 of the shell intermediate portion 12M (or the shell upper portion 12U), and the other side of the baffle plate 28 is in close contact with the step of the large diameter portion 84, and brazing (reference numeral 52 is a brazing material) is performed between the inner peripheral surface of the large diameter portion 84 and the outer peripheral surface of the small diameter portion 83 of the shell intermediate portion 12M (or the shell upper portion 12U). Note that, as shown in Fig. 5(B), brazing (reference numeral 52 is a brazing material) may also be performed between the end face of the large diameter portion 84 and the outer peripheral surface of the small diameter portion 83 of the shell intermediate portion 12M (or the shell upper portion 12U).

[0058] (Upper flange, lower flange) As shown in Figure 4, the upper flange 14 and the lower flange 16 of this embodiment have partially different shapes from the upper flange 14 and the lower flange 16 of the first embodiment. The upper flange 14 and the lower flange 16 have the same configuration, so the upper flange 14 will be described as a representative. The upper flange 14 is formed into a disk shape from a metal plate, and has a cylindrical portion 14A formed on its outer periphery, and an annular protrusion 14B formed on the inner periphery of the cylindrical portion 14A that protrudes in the same direction as the cylindrical portion 14A.

[0059] One end of the shell upper part 12U is fitted inside the annular protrusion 14B of the upper flange 14, and one end of the shell upper part 12U and the annular protrusion 14B of the upper flange 14 are joined by brazing (reference numeral 52 denotes a brazing material). Similarly, one end of the shell lower part 12L is fitted inside the annular protrusion 14B of the lower flange 16, and one end of the shell lower part 12L and the annular protrusion 14B of the lower flange 16 are joined by brazing (reference numeral 52 denotes a brazing material).

[0060] In the heat exchanger 10 of this embodiment, one end of the heat transfer tube 30 protrudes from the upper flange 14, and as shown in Fig. 6, this one end is provided with crimped portions 86 at multiple locations (four locations in this embodiment) or around the entire circumference, which are locally deformed (expanded) radially outward. Note that the other end of the heat transfer tube 30 is also provided with crimped portions 86 similar to the one end. Furthermore, as shown in Fig. 4, the entire circumference of the portion of the heat transfer tube 30 protruding from the flange surface is joined to the flange surface by brazing (reference numeral 52 is a brazing material).

[0061] Next, an example of a manufacturing process for the heat exchanger 10 of this embodiment will be described with reference to Figures 7 to 9. Note that Figures 7 to 9 show simplified configurations for ease of understanding. (1) As shown in FIG. 7 , the upper flange 14, the upper shell portion 12U, the middle shell portion 12M, the baffle plate 28, the lower shell portion 12L, and the lower flange 16 are stacked together, and heat transfer tubes 30 with a circular cross section and a constant diameter are inserted into the circular holes 32 of the upper flange 14, the circular holes 56 of the baffle plate 28, and the circular holes 32 of the lower flange 16.

[0062] (2) As shown in Figure 8(A), a cut bolt 88 that is longer than the heat transfer tube 30 is inserted into the heat transfer tube 30, and a crimping jig 90 and a nut 92 are attached to both ends of the cut bolt 88. As shown in Figures 8(A) and (B), the crimping jig 90 has a cylindrical main body 90A on the outer periphery thereof, and a tapered protrusion 90B is formed on approximately half of the axial direction.

[0063] (3) When one of the nuts 92 attached to the cut bolt 88 is tightened, the crimping jig 90 moves toward the inside of the heat transfer tube 30, and the tapered protrusion 90B deforms the end of the heat transfer tube 30 radially outward, thereby performing the crimping process.

[0064] By crimping both ends of the heat transfer tubes 30 in this manner, the upper flange 14, the upper shell portion 12U, the intermediate shell portion 12M, the baffle plate 28, the lower shell portion 12L, and the lower flange 16 are temporarily assembled. Furthermore, by crimping both ends of the heat transfer tubes 30, a compressive force can be applied in the axial direction to the upper shell portion 12U, the intermediate shell portion 12M, the baffle plate 28, and the lower shell portion 12L, which are arranged between the upper flange 14 and the lower flange 16. This allows the end of the upper shell portion 12U to be tightly attached to the baffle plate 28, the end of the intermediate shell portion 12M to be tightly attached to the baffle plate 28, and the end of the lower shell portion 12L to be tightly attached to the baffle plate 28 (see FIG. 9).

[0065] (4) The heat transfer medium pipe 50 is inserted into the hole 53 in the upper shell 12U and the hole 53 in the lower shell 12L (see FIG. 9).

[0066] (5) After that, for example, paste containing brazing material is applied to the areas to be brazed, and the temporary assembly is placed in a vacuum heating furnace and heated to braze each part.

[0067] In the heat exchanger 10 of this embodiment, the upper flange 14, the upper shell part 12U, the middle shell part 12M, the baffle plate 28, the lower shell part 12L, and the lower flange 16 are stacked, and both ends of the heat transfer tube 30 that passes through them are crimped, so that the upper flange 14, the upper shell part 12U, the middle shell part 12M, the baffle plate 28, the lower shell part 12L, and the lower flange 16 can be temporarily assembled (temporarily fixed) in the stacked state, eliminating the need for spot welding or the like to fix them, and improving workability when brazing.

[0068] Furthermore, in this embodiment, the temporary assembly can be placed in a vacuum heating furnace and all brazing points can be brazed at once, so the brazing work can be carried out efficiently in a short time compared to when brazing points one by one by hand.

[0069] [Third embodiment] A heat exchanger 10 according to a third embodiment of the present invention will be described with reference to Fig. 10. The same components as those in the above-described embodiment are given the same reference numerals, and the description thereof will be omitted.

[0070] As shown in FIG. 10, the shell body 12 of the heat exchanger 10 of this embodiment has a double-cylinder structure, and an inner shell 98 as an example of a tubular member and a baffle plate 28 are inserted inside an outer shell 96 as an example of an outer shell.

[0071] The outer shell 96 is a single cylindrical member made of a metal material and disposed between the upper flange 14 and the lower flange 16. Heat transfer medium pipes 50 are joined to the outer peripheral surface of the outer shell 96 at one end and the other end by brazing (reference numeral 52 denotes a brazing filler metal).

[0072] Inside the outer shell 96, inner shells 98 and baffle plates 28 are alternately arranged. The configuration in which the inner shells 98 and baffle plates 28 are alternately arranged corresponds to the inner shell body of the present invention. The opening edges of axially adjacent inner shells 98 sandwich the outer edges of the baffle plates 28, thereby forming multiple chambers with the baffle plates 28. The inner shells 98 and outer shell 96 are in close contact with each other.

[0073] Holes 94 are formed in the inner shells 98 on both axial sides at positions facing the heat transfer medium pipes 50 .

[0074] An example of a method for placing the inner shell 98 inside the outer shell 96 and tightly contacting the inner shell 98 with the outer shell 96 will be described below. The inner shell 98 is formed in a C-shape when viewed in the axial direction. Before being inserted into the outer shell 96, the inner shell 98 is deformed so that one end and the other end in the circumferential direction are separated, and the outer diameter of the inner shell 98 is expanded in advance to be slightly larger than the inner diameter of the outer shell 96.

[0075] To place the inner shell 98 in the outer shell 96, one circumferential end of the inner shell 98 is brought close to the other end, the inner shell 98 is elastically deformed to reduce its diameter, and the reduced-diameter inner shell 98 is inserted into the outer shell 96.

[0076] The inner shell 98 inserted into the outer shell 96 expands in diameter inside the outer shell 96 due to its own elasticity, so that the outer peripheral surface of the inner shell 98 tightly contacts the inner peripheral surface of the outer shell 96 .

[0077] In the heat exchanger 10 of this embodiment, both ends of the heat transfer tubes 30 are also crimped, so that the axial ends of the inner shell 98 are in close contact with the baffle plate 28, thereby preventing leakage of the second heat medium from between the inner shell 98 and the baffle plate 28.

[0078] Furthermore, in the heat exchanger 10 of this embodiment, the axial end of the inner shell 98 is in close contact with the baffle plate 28 to prevent leakage of the second fluid, so there is no need to join the axial end of the inner shell 98 and the baffle plate 28 by brazing or welding.

[0079] In the heat exchanger 10 of this embodiment, by increasing or decreasing the number of baffle plates 28 and inner shells 98 and adjusting the lengths of the outer shells 96 and heat transfer tubes 30 accordingly, the heat exchanger performance can be easily adjusted, and heat exchangers 10 with different specifications can be easily manufactured.

[0080] [Fourth embodiment] A heat exchanger 10 according to a fourth embodiment of the present invention will be described with reference to Fig. 11. The heat exchanger 10 of this embodiment is a modified example of the third embodiment described above, and the same components as those of the third embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0081] In the third embodiment of the heat exchanger 10, multiple inner shells 98 and baffle plates 28 were inserted into the inside of the outer shell 96 to connect the inner shells 98 and the baffle plates 28, but in the fourth embodiment of the heat exchanger 10, the inner shells 98 are joined together by brazing (symbol 52 is a brazing material) using a ring 100 made of a metal material.

[0082] Therefore, the heat exchanger 10 of this embodiment uses fewer materials than the heat exchanger 10 of the third embodiment.

[0083] [Fifth embodiment] A heat exchanger 10 according to a fifth embodiment of the present invention will be described with reference to Fig. 12. The heat exchanger 10 of this embodiment is a modified example of the first embodiment described above, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. 12, in the heat exchanger 10 of this embodiment, as in the second and third embodiments, one end of the heat transfer tube 30 protrudes from the upper flange 14, and crimped portions 86 are provided at multiple locations or around the entire circumference of the one end. The other end of the heat transfer tube 30 is also provided with crimped portions 86, similar to the one end. Furthermore, the entire circumference of the portion of the heat transfer tube 30 protruding from the flange surface is joined to the flange surface by brazing (reference numeral 52 is a brazing material). In the heat exchanger 10 according to the fifth embodiment, by crimping both ends of the heat transfer tubes 30, the upper flange 14, the upper shell portion 12U, the middle shell portion 12M, the baffle plate 28, the lower shell portion 12L, and the lower flange 16 can be temporarily assembled in the same manner as in the second embodiment, which makes the subsequent brazing work easier.

[0084] [Other embodiments] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms within the scope of the gist of the present invention.

[0085] In the above embodiment, components made of metal materials are joined together by brazing or welding, which are examples of joining members, but the components may also be joined together by soldering or with a heat-resistant adhesive.

[0086] Although the heat exchanger 10 in the above embodiment has a cylindrical shape, it may have a rectangular cylindrical shape. In the heat exchanger 10 described above, the heat transfer medium pipes 50 are provided on the outer periphery of the shell body 12, but they may also be provided on the upper flange 14 and the lower flange 16. [Explanation of symbols]

[0087] 10 Heat exchanger 12 Shell body 12U upper shell (cylindrical member) 12M Shell middle part (cylindrical member) 12L Shell lower part (cylindrical part) 14 Upper flange (flange) 16 Lower flange (flange) 28 Baffle plate 30 Heat transfer tube 50 Heat medium piping (second inlet, second outlet) 52 Brazing material (joining material) 54 Opening 83 Small diameter portion (opening edge on the other side) 86 Crimping part 84 Large diameter part (step) 96 Outer shell 98 Inner shell (cylindrical member)

Claims

1. a shell body including a plurality of cylindrical members, the outer edge of a baffle plate being sandwiched between the opening edges of the cylindrical members adjacent in the axial direction to eliminate a gap between the cylindrical members and the baffle plate, and the baffle plate forming a plurality of chambers; two flanges at both ends of the shell body that close the opening of the tubular member, respectively; a heat transfer tube provided inside the shell body and penetrating the baffle plates and the flanges, into which a first fluid flows from the outside of one of the flanges and into which the first fluid flows out to the outside of the other of the flanges; a second inlet portion that penetrates the outer peripheral wall of the shell body and allows a second fluid to flow into the chamber on one side of the shell body; a second outlet portion that penetrates the outer peripheral wall of the shell body and allows the second fluid to flow out from the chamber on the other side of the shell body; an opening formed in the baffle plate, along an inner edge of which a plurality of the heat transfer tubes are arranged, for passing the second fluid from one of the adjacent chambers to another of the adjacent chambers; A heat exchanger having:

2. a crimping portion is formed at each end of the heat transfer tube to be crimped to the flange to introduce a tensile force into the heat transfer tube, and the cylindrical member and the baffle plate are in contact with each other in a pressurized state between one flange and the other flange; The heat exchanger of claim 1 .

3. The opening edge of the cylindrical member is abutted against a baffle plate.

3. The heat exchanger of claim 2.

4. a step portion is formed on an outer periphery of an opening edge portion on one side of the cylindrical member, the step portion being expanded in the radial direction and then rising in the axial direction to receive the outer edge portion of the baffle plate and the opening edge portion on the other side of the cylindrical member, The baffle plate is sandwiched between the radially expanded portion and the opening edge portion on the other side of the adjacent other cylindrical member.

3. The heat exchanger of claim 2.

5. the shell body includes an outer shell that is fitted on the outside of the cylindrical member and the baffle plate, The two flanges close the openings of the tubular members at both ends of the shell body, respectively, and also close the openings at both ends of the outer shell.

3. The heat exchanger of claim 2.

6. a contact portion between the cylindrical member and the baffle plate, a contact portion between the flange and the cylindrical member, and a contact portion between the heat transfer tube and the flange are joined using a joining member; The heat exchanger according to any one of claims 2 to 4.

7. a contact portion between the flange and the outer shell and a contact portion between the heat transfer tube and the flange are joined using a joining member; 6. The heat exchanger according to claim 5.

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