Heat exchanger and manufacturing method thereof

Abstract

To suppress a quality defect caused by vibration during brazing in a furnace.SOLUTION: A heat exchanger (13) comprises a first member (41), a second member (42), and a latch (43). The first member (41) includes a first hole (41a) and is made of aluminum. The second member (42) includes a second hole (42a) and is made of aluminum. The latch (43) penetrates the first hole (41a) and the second hole (42a). The latch (43) is fixed to the first member (41) and the second member (42). The latch (43) consists of an aluminum alloy whose manganese content is equal to or less than 1.5% and whose copper content is equal to or less than 1.0%.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present disclosure relates to a heat exchanger for use in a refrigeration device and a method for manufacturing the same. [Background technology]

[0002] The heat exchanger disclosed in Patent Document 1 (JP 2021-025718 A) has a stacked header. The stacked header has a plurality of plates. Some of the plates are applied with brazing material. The stacked plates are fixed by furnace brazing to obtain the stacked header. Summary of the Invention [Problem to be solved by the invention]

[0003] During the furnace brazing process, the stack is susceptible to vibration. Plate misalignment due to vibration reduces the reliability of the heat exchanger. To prevent such misalignment, the stack is temporarily fixed prior to furnace brazing. There are various methods for temporary fixing, including welding, tube expansion, and crimping. However, all of these methods require specialized equipment, the cost of which is passed on to the cost of the stack header and heat exchanger. [Means for solving the problem]

[0004] A heat exchanger according to a first aspect includes a first member, a second member, and a latch. The first member is provided with a first hole and is made of aluminum. The second member is provided with a second hole and is made of aluminum. The latch is disposed in the first hole and the second hole. The latch is fixed to the first member and the second member. The latch is made of an aluminum alloy having a manganese content of 1.5% or less and a copper content of 1.0% or less.

[0005] According to this configuration, the latch is made of an aluminum alloy containing 1.5% or less manganese and 1.0% or less copper. This reduces the latch's ability to repel the brazing material or cause galvanic corrosion, and allows the latch to be easily fixed to the first and second members. This eliminates the need for complex processes such as welding, expanding, and crimping in the manufacturing process.

[0006] A heat exchanger according to a second aspect is the heat exchanger according to the first aspect, further comprising a stacked header, At least one of the first member and the second member being a stacking plate included in the stacked header.

[0007] According to this configuration, the latch is used in assembling the laminated header, which makes it easier to assemble the laminated header, thereby reducing the cost of the heat exchanger.

[0008] A heat exchanger according to a third aspect is the heat exchanger according to the first or second aspect, in which the second hole is a screw hole, and the surface of the latch has a sawtooth shape that engages with the screw hole.

[0009] According to this configuration, the latch and the screw hole engage with each other, so that the first member and the second member are firmly fixed to each other.

[0010] A heat exchanger according to a fourth aspect is any one of the heat exchangers according to the first aspect to the third aspect, wherein a first potential difference caused by the latch and the first member contacting each other, and a second potential difference caused by the latch and the second member contacting each other are both 100 mV or less. According to this configuration, a galvanic current is unlikely to flow between the first member or the second member and the latch, and therefore metal corrosion is unlikely to occur around the latch.

[0011] A heat exchanger according to a fifth aspect is the heat exchanger according to any one of the first aspect to the fourth aspect, in which the material of the latch is represented by a number in the 3000 or 4000 series of the ISO aluminum alloy standard.

[0012] According to this configuration, the latch and the first or second member are made of the same material, or the latch and the brazing material are made of the same material, so that galvanic corrosion is less likely to occur at the contact points between the members, thereby improving the reliability of the heat exchanger.

[0013] A sixth aspect of the present invention relates to a heat exchanger according to the fifth aspect, in which the aluminum alloy is represented by a number in the 3000 series of the ISO aluminum alloy standard. The latch is brazed to both the first member and the second member.

[0014] According to this configuration, the latch and the first member or the second member are made of the same material, so galvanic corrosion does not occur at the contact area between the members.

[0015] A heat exchanger according to a seventh aspect is the heat exchanger according to the fifth aspect, in which the aluminum alloy is represented by a number in the 4000 series of the ISO aluminum alloy standard.

[0016] According to this configuration, the latch is made of brazing material, and therefore the galvanic current generated at the contact portion between the members is negligibly small, making corrosion unlikely to occur.

[0017] A refrigeration device according to an eighth aspect includes the heat exchanger according to any one of the first aspect to the seventh aspect.

[0018] According to this configuration, a corrosion-resistant and inexpensive heat exchanger is installed in the refrigeration device, so the refrigeration device has a long life and is inexpensive.

[0019] The manufacturing method according to a ninth aspect is a method for manufacturing a heat exchanger. In the manufacturing method, a first aluminum member having a first hole and a second aluminum member having a second hole are prepared. A latch is prepared, the latch being made of an aluminum alloy having a manganese content of 1.5% or less and a copper content of 1.0% or less. An assembly is created by placing the latch in the first hole and the second hole. The assembly is heated in a furnace to fix the latch to the first member and the second member.

[0020] According to this method, the latch is made of an aluminum alloy containing 1.5% or less manganese and 1.0% or less copper. Therefore, the latch is less likely to repel the brazing material or cause galvanic corrosion, and is easily fixed to the first and second components. This eliminates the need for complicated steps such as welding, expanding, and crimping in the manufacturing process.

[0021] A manufacturing method according to a tenth aspect is the manufacturing method according to the ninth aspect, in which the second hole is a screw hole, and the latch is a bolt.

[0022] According to this configuration, the latch configured as a bolt engages with the second hole configured as a screw hole, thereby firmly fixing the first member and the second member.

[0023] A manufacturing method according to an eleventh aspect is the manufacturing method according to the tenth aspect, in which the bolts are fastened with a fastening torque of 0.3 N·m or less.

[0024] According to this method, the fastening force of the bolt is weak, and therefore the risk of breaking the bolt is low.

[0025] A manufacturing method according to a twelfth aspect is the manufacturing method according to any one of the ninth aspect to the eleventh aspect, in which the assembly is placed on a conveyor before being heated in the furnace.

[0026] According to this method, the assembly is placed on a conveyor, so that the transport through the furnace is stable.

[0027] A manufacturing method according to a thirteenth aspect is the manufacturing method according to any one of the ninth aspect to the twelfth aspect, in which the material of the latch is represented by a number in the 3000 series of the ISO aluminum alloy standard. Before heating the assembly in a furnace, a brazing material is placed on the assembly.

[0028] According to this method, the latch and the first or second member are made of the same material, so galvanic corrosion does not occur at the contact points between the members.

[0029] A fourteenth aspect of the present invention relates to any one of the ninth to twelfth aspects of the present invention, in which the material of the latch is represented by a number in the 4000 series of the ISO aluminum alloy standard, and the latch melts when the assembly is heated in a furnace.

[0030] According to this method, the latch is made of brazing material, and therefore the galvanic current generated at the contact portion between the members is negligibly small, so that corrosion is unlikely to occur. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a schematic diagram of a refrigeration device 100. [Diagram 2] FIG. 2 is a schematic diagram of the heat source heat exchanger 13. As shown in FIG. [Diagram 3] FIG. 3 is a perspective view of the heat source heat exchanger 13. As shown in FIG. [Figure 4] FIG. 4 is a perspective view of a stacked header. [Diagram 5] FIG. 5 is an overall perspective view of the first header 51. As shown in FIG. [Figure 6] FIG. 6 is a perspective view of an end portion of the first header 51. As shown in FIG. [Figure 7] FIG. 7 is a perspective view showing a connection portion of the gas side pipe 61 in the first header 51. As shown in FIG. [Figure 8] FIG. 8 is an overall perspective view of the second header 52. As shown in FIG. [Figure 9] FIG. 9 is a perspective view showing the holding positions of the plurality of turn-back tubes 81 in the second header 52. As shown in FIG. [Figure 10] FIG. 10 is a schematic diagram of a manufacturing facility for the heat source heat exchanger 13. As shown in FIG. [Figure 11] FIG. 11 is a schematic view showing a first step of the manufacturing method according to the first embodiment. [Figure 12] FIG. 12 is a schematic view showing a second step of the manufacturing method according to the first embodiment. [Figure 13] FIG. 13 is a schematic view showing a third step of the manufacturing method according to the first embodiment. [Figure 14] FIG. 14 is a schematic view showing a first step of a manufacturing method according to a first modified example of the first embodiment. [Figure 15] FIG. 15 is a schematic view showing a second step of the manufacturing method according to the first modified example of the first embodiment. [Figure 16] FIG. 16 is a schematic view showing a third step of the manufacturing method according to the first modified example of the first embodiment. [Figure 17] FIG. 17 is a schematic diagram showing a third modified example of the first embodiment. [Figure 18] FIG. 18 is a schematic diagram showing a first step of the manufacturing method according to the second embodiment. [Figure 19] FIG. 19 is a schematic view showing a second step of the manufacturing method according to the second embodiment. [Figure 20] FIG. 20 is a schematic view showing a third step of the manufacturing method according to the second embodiment. [Figure 21] FIG. 21 is a diagram for explaining a state in which the wettability of the latch 43 with the brazing material 44 is poor. [Figure 22] FIG. 22 is a diagram illustrating a state in which the wettability of the latch 43 with the brazing material 44 is medium. [Figure 23] FIG. 23 is a diagram for explaining a state in which the latch 43 has good wettability with the brazing material 44. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] <Configuration common to each embodiment> (1) Overall structure 1 is a schematic diagram of a refrigeration device 100. The refrigeration device 100 may be an air conditioner, a freezer, a refrigerator, a water heater, a floor heating device, or the like. The refrigeration device 100 has a heat source unit 10, a utilization unit 20, and a refrigerant communication pipe group 30. These constitute a refrigerant circuit that circulates the refrigerant. Furthermore, the refrigeration device 100 has a communication line 39.

[0033] (2) Detailed configuration (2-1) Heat source unit 10 The heat source unit 10 is for obtaining cold or heat from a heat source. The heat source unit 10 includes a heat source casing 105, a compressor 11, a four-way switching valve 12, a heat source heat exchanger 13, a heat source fan 14, a heat source expansion valve 15, an accumulator 16, a liquid shutoff valve 17, a gas shutoff valve 18, and a heat source control unit 19.

[0034] The compressor 11 draws in low-pressure gas refrigerant through a suction pipe 11a, compresses it, and produces high-pressure gas refrigerant, which is then discharged from a discharge pipe 11b.

[0035] The four-way switching valve 12 forms the connections shown by the solid lines in the case of cold heat utilization operation, and forms the connections shown by the dashed lines in the case of hot heat utilization operation.

[0036] The heat source heat exchanger 13 functions as a condenser in cold heat utilization operation. At this time, the heat source heat exchanger 13 receives high-pressure gas refrigerant from the gas side pipe 61 and discharges high-pressure liquid refrigerant from the liquid side pipe 71. On the other hand, the heat source heat exchanger 13 functions as an evaporator in hot heat utilization operation. At this time, the heat source heat exchanger 13 receives low-pressure gas-liquid two-phase refrigerant from the liquid side pipe 71 and discharges low-pressure gas refrigerant from the gas side pipe 61. The detailed structure of the heat source heat exchanger 13 will be described later.

[0037] The heat source fan 14 promotes heat exchange in the heat source heat exchanger 13 by generating an air flow that passes through the heat source heat exchanger 13 .

[0038] The heat source expansion valve 15 reduces the pressure of the high pressure liquid refrigerant to produce a low pressure gas-liquid two-phase refrigerant.

[0039] The accumulator 16 separates the liquid component contained in the gas refrigerant and stores it in a container.

[0040] The liquid shutoff valve 17 and the gas shutoff valve 18 are closed when an installer shuts off the refrigerant circuit.

[0041] The heat source control unit 19 acquires output values ​​from various sensors and controls various actuators.

[0042] (2-2) Usage unit 20 The utilization unit 20 is for providing cold or hot heat to a user. The utilization unit 20 includes a utilization casing 205, a utilization heat exchanger 23, a utilization fan 24, and a utilization control unit 29.

[0043] The utilization heat exchanger 23 functions as an evaporator in the cold heat utilization operation, and functions as a condenser in the hot heat utilization operation.

[0044] The utilization fan 24 generates an air flow passing through the utilization heat exchanger 23, thereby promoting heat exchange in the utilization heat exchanger 23. In addition, when the refrigeration device 100 is an air conditioner, the utilization fan 24 delivers conditioned air to a user.

[0045] The usage control unit 29 acquires output values ​​from various sensors, controls various actuators, and communicates with the heat source control unit 19.

[0046] (2-3) Refrigerant connection pipe group 30 The refrigerant connection pipe group 30 includes a liquid connection pipe 31 and a gas connection pipe 32. The liquid connection pipe 31 connects the liquid stop valve 17 and the utilization heat exchanger 23. The gas connection pipe 32 connects the gas stop valve 18 and the utilization heat exchanger 23.

[0047] (2-4) Communication line 39 The communication line 39 connects the heat source control unit 19 and the usage control unit 29. The heat source control unit 19 and the usage control unit 29 transmit and receive commands, status, and data via the communication line 39.

[0048] First Embodiment (1) Detailed structure of heat source heat exchanger 13 2 is a schematic diagram showing the structure of the heat source heat exchanger 13 according to the first embodiment. The heat source heat exchanger 13 has a first header 51, a second header 52, a heat exchange section 53, a gas side pipe 61, a liquid side pipe 71, and a return pipe 81.

[0049] (1-1) 1st Header 51 The first header 51 is a laminated header having a plurality of laminated plates. The plates for lamination are made of aluminum, and the material is typically one that is represented by a number in the 3000s of the ISO aluminum alloy standard. Aluminum alloys represented by numbers in the 3000s are aluminum-manganese alloys, and examples of such alloys include 3003 and 3004.

[0050] The first header 51 has a first gas chamber 51a and a first liquid chamber 51b by a cavity or the like provided in the plate. A plurality of first gas chambers 51a and a plurality of first liquid chambers 51b may be provided. A part of the plate functions as a first partition wall 51c that separates the first gas chamber 51a and the first liquid chamber 51b. A gas side pipe 61 and a liquid side pipe 71 are connected to the first header 51. The gas side pipe 61 is connected to the first gas chamber 51a. The liquid side pipe 71 is connected to the first liquid chamber 51b.

[0051] (1-2) 2nd Header 52 The second header 52 is also a laminated header having a plurality of plates laminated in the same manner as the first header 51. The material of the plates is typically expressed by a number in the 3000s of the ISO aluminum alloy standard. The second header 52 has a second gas chamber 52a and a second liquid chamber 52b by a cavity or the like provided in the plate. A plurality of second gas chambers 52a and a plurality of second liquid chambers 52b may be provided. A part of the plate functions as a second partition wall 52c that separates the second gas chamber 52a and the second liquid chamber 52b. A return pipe 81 is connected to the second header 52. The second gas chamber 52a and the second liquid chamber 52b are connected to each other via the return pipe 81.

[0052] (1-3) Heat exchange section 53 The heat exchange unit 53 has a plurality of refrigerant pipes 54 and a plurality of fins 55 attached to the refrigerant pipes 54. Each of the plurality of refrigerant pipes 54 connects the first gas chamber 51a and the second gas chamber 52a, or connects the first liquid chamber 51b and the second liquid chamber 52b.

[0053] 3 realistically illustrates the structure of the heat-source heat exchanger 13. The heat exchange section 53 forms a wall that stands vertically as a whole, and is L-shaped in plan view.

[0054] (1-4) Around the gas side pipe 61 4 shows the structure of the end of the first header 51. The first header 51 has a plurality of stacked aluminum alloy plates 58 and an aluminum alloy outer wall member 57 surrounding them. The outer wall member 57 is provided with a plurality of crimping claws 59. The crimping claws 59 restrain the plurality of plates 58 by being bent. At least a portion of the plurality of plates 58 and the outer wall member 57 is a clad material to which a rolled brazing material is applied. The plurality of plates 58 and the outer wall member 57 are fixed to each other by furnace brazing.

[0055] FIG. 5 shows the entire first header 51. It can be seen from this figure that the gas side pipe 61 and the liquid side pipe 71 are connected to the first header 51. A cover 56 is provided around the gas side pipe 61 to form a refrigerant flow path by covering a plurality of plates 58. As shown in FIG. 6, the cover 56 is restrained to the plates 58 by latches 56a before the furnace brazing. The latches 56a are bolts having threads. The latches 56a are intended to suppress misalignment between the cover 56, the plates 58, and the outer wall member 57 during the furnace brazing.

[0056] As shown in FIG. 7, a sleeve 62, a bracket 63, and a latch 64 are provided at the connection point between the cover 56 and the gas side pipe 61. An opening is provided at the cover 56 where the sleeve 62 is provided, and the gas side pipe 61 and the first header 51 can exchange refrigerant through this opening. The sleeve 62 is a clad material, and fixes the cover 56 and the gas side pipe 61 to each other by furnace brazing. The bracket 63 is restrained by the latch 64 to both the cover 56 and the sleeve 62 before the furnace brazing. The latch 64 is a bolt having a thread. The latch 64 is for suppressing the displacement between the cover 56 and the sleeve 62 during the furnace brazing.

[0057] (1-5) Around the liquid side pipe 71 Returning to Fig. 5, a tube holding plate 72 is provided around the liquid side tube 71 connected to one end side of the first header 51. The tube holding plate 72 is restrained to the first header 51 by a latch 73 before furnace brazing. The latch 73 is a bolt having a thread. The latch 73 is intended to prevent misalignment between the tube holding plate 72 and the first header 51 during the furnace brazing period.

[0058] (1-6) Around the folded pipe 81 4, which will be referred to again, also shows the structure of the second header 52. The structure of the second header 52 is similar to that of the first header 51.

[0059] 8 shows the entire second header 52. It can be seen from this figure that a plurality of turn-back tubes 81 are connected to the second header 52. A plurality of tube holding plates 82 are provided around the turn-back tubes 81. The tube holding plates 82 are restrained to the plate 58 by latches 83 such as bolts before furnace brazing. The latches 83 are bolts having threads. The latches 83 are intended to prevent misalignment between the tube holding plates 82 and the plate 58 during the furnace brazing period.

[0060] 9, a tube holding plate 84 is also provided to collectively hold a plurality of folded tubes 81. The tube holding plate 84 is restrained to the plate 58 by latches 83 such as bolts before the furnace brazing, so that the positional deviation between the tube holding plate 84 and the plate 58 is suppressed.

[0061] (2) Manufacturing method 10 shows a manufacturing facility for the heat source heat exchanger 13. First, a first member 41, a second member 42, and a latch 43 are prepared on a mounting table 91. The first member 41 and the second member 42 are fixed to each other by furnace brazing, and at least one of them is a clad material.

[0062] The first member 41 refers to the cover 56 around the gas side pipe 61, the pipe holding plate 72 around the liquid side pipe 71, the pipe holding plate 82 around the turn-back pipe 81, and the like.

[0063] The second member 42 refers to the sleeve 62 around the gas side pipe 61, the plate 58, and in some cases the cover 56, the plate 58 around the liquid side pipe 71, and the plate 58 around the turn-back pipe 81, and the like.

[0064] The latch 43 refers to the latch 56 a and the latch 64 around the gas side pipe 61 , the latch 73 around the liquid side pipe 71 , and the latch 83 around the turn-back pipe 81 .

[0065] 11 to 13 show a manufacturing method of the first embodiment. FIG. 11 shows a first step of the manufacturing method. A first hole 41a is provided in the first member 41. The first hole 41a penetrates the first member 41. The first member 41 is a clad material, in other words, a plate in which a brazing material 44 is provided. A second hole 42a is provided in the second member 42. The second hole 42a is configured as a through hole penetrating the second member 42. The second hole 42a is configured as a screw hole. The latch 43 is for binding the first member and the second member to each other, and is used for temporary fixing. The latch 43 is configured as a bolt. The surface of the latch 43, which is a bolt, has a sawtooth shape 43a of a thread that engages with the second hole 42a, which is a screw hole. The latch 43 is formed of an aluminum alloy with a manganese content of 1.5% or less and a copper content of 1.0% or less. The manganese content of the latch 43 may be 1.0% or less. In this embodiment, the material of the latch 43 is one that is represented by a number in the 3000s of the ISO aluminum alloy standard. Aluminum alloys represented by numbers in the 3000s are aluminum-manganese alloys, and examples of such alloys include 3003 and 3004.

[0066] A first potential difference V1 is generated by the latch 43 and the first member 41 contacting each other. A second potential difference V2 is generated by the latch 43 and the second member 42 contacting each other. The first potential difference V1 and the second potential difference V2 are both 100 mV or less.

[0067] 12 shows the second step of the manufacturing method. Latch 43 is placed in first hole 41a and second hole 42a. Next, the bolt that constitutes latch 43 is fastened to create assembly 40. The fastening torque value when fastening the bolt is 0.3 N m or less.

[0068] 10, the assembly 40 is placed on a conveyor 92. The conveyor 92 slowly moves the assembly 40 through a furnace 93. The assembly 40 is heated in the furnace 93, whereby in-furnace brazing is performed.

[0069] 13 shows the third step of the manufacturing method. The brazing material 44 melts from the cladding material and adheres the latch 43 to the first member 41 and the second member 42. The assembly 40 is then cooled outside the furnace 93, and the latch 43 is secured to the first member 41 and the second member 42.

[0070] (3) Features (3-1) In general, when brazing a base material, it is necessary that the so-called "wettability" between the base material and the brazing material is good. Wettability means the affinity between the base material and the brazing material. Figs. 21 to 23 are diagrams for explaining the wettability of the base material, ie, the latch 43, with the brazing material 44. The wettability can be observed as a contact angle θ between the latch 43, which is a solid, and the brazing material 44, which is a liquid. Fig. 21 shows a state in which the wettability between the latch 43 and the brazing material 44 is poor, and the contact angle θ has a large value of 180°. Fig. 22 shows a state in which the wettability between the latch 43 and the brazing material 44 is medium, and the contact angle θ has a smaller value of 90°. Fig. 23 shows a state in which the wettability between the latch 43 and the brazing material 44 is good, and the contact angle θ has an even smaller value of less than 90°.

[0071] When the manganese content of the base material is small, the wettability of the base material is improved when the brazing material is placed on the base material. On the other hand, when the manganese content of the base material is large, the oxide film formed on the base material becomes strong, and the wettability is deteriorated. The material of the latch 43 is represented by a number in the 3000 series of the ISO aluminum alloy standard. Aluminum alloys represented by numbers in the 1000 series, 3000 series, and 4000 series have a smaller manganese content than aluminum alloys in the 2000 series and 5000 series. Therefore, by adopting an aluminum alloy in the 3000 series, the wettability of the latch 43 can be improved. In addition, the latch 43 is made of an aluminum alloy with a manganese content of 1.5% or less and a copper content of 1.0% or less. This manganese content of 1.5% or less is sufficiently small to ensure wettability. In addition, when the manganese content of the latch 43 is 1.0% or less, the wettability is further improved.

[0072] Therefore, the latch 43 is less likely to repel the brazing material or cause galvanic corrosion, and is easily fixed to the first member 41 and the second member 42. This makes complex processes such as welding, expanding, and crimping unnecessary in the manufacturing process. In addition, it may be possible to avoid a situation in which dedicated equipment required for such complex processes increases the cost of the heat exchanger.

[0073] (3-2) The latch 43 is used for assembling the stacked header. Therefore, the assembly of the stacked header is easy, and the cost of the heat source heat exchanger 13 can be reduced.

[0074] (3-3) The latch 43, which is a bolt, engages with the second hole 42a, which is a screw hole, so that the first member 41 and the second member 42 are firmly fixed together.

[0075] (3-4) The latch 43 is made of the same material as the first member 41 or the second member 42. Therefore, galvanic corrosion does not occur at the contact portion between the members.

[0076] (3-5) The tightening torque value when tightening the latch 43, which is a bolt, is small, at 0.3 N·m or less, so there is little risk of breaking the bolt, which is made of a material with poor hardness.

[0077] (3-6) In manufacturing the heat source heat exchanger 13, the assembly 40 is placed on a conveyor 92. The conveyor 92 is a vibration source, and may induce misalignment between the members constituting the assembly 40. However, the assembly 40 is temporarily fixed by latches 43, which suppress misalignment, and therefore transportation through a furnace is unlikely to adversely affect the quality of the heat source heat exchanger 13.

[0078] (4) Variations Modifications of the first embodiment will be described below. A plurality of modifications may be combined.

[0079] (4-1) First Modification In the first embodiment, the second hole 42a is configured as a screw hole. Also, the latch 43 is configured as a bolt. However, instead of this, the second hole 42a does not have to be a screw hole in particular. Or, the latch 43 may be configured as a rod without a thread. Or, both may be used.

[0080] 14 to 16 show a manufacturing method according to a first modified example of the first embodiment. Fig. 14 shows the first step of the manufacturing method. It can be seen that the second hole 42a is not a threaded hole, and the latch 43 is a rod without a thread.

[0081] 15 shows the second step of the manufacturing method. The latch 43 is placed in the first hole 41a and the second hole 42a. By appropriately setting the diameters of the first hole 41a and the second hole 42a, the clearance can be reduced, thereby preventing the first member 41 and the second member 42 from being misaligned.

[0082] 16 shows the third step of the manufacturing method. The brazing material 44 melts from the cladding material and adheres the latch 43 to the first member 41 and the second member 42. The assembly 40 is then cooled outside the furnace 93, and the latch 43 is secured to the first member 41 and the second member 42.

[0083] (4-2) Second Modification In the first embodiment, what contributes to furnace brazing is the brazing material 44 applied to the first member 41 or the second member 42 configured as a clad material. Alternatively, the first member and the second member 42 may both be prepared as bare materials, and brazing materials separate from the first member and the second member may be placed at the joint between the two members.

[0084] (4-3) Third Modification In the first embodiment, the second hole 42a is configured as a through hole penetrating the second member 42. Alternatively, as shown in Fig. 17, the second hole 42a may be configured as a recess having a dead end.

[0085] <Second embodiment> (1) Composition The second embodiment is very similar in structure to the first embodiment, but differs in materials, which will be mentioned below while explaining the manufacturing method according to the second embodiment.

[0086] 18 to 20 show a manufacturing method according to the second embodiment. Fig. 18 shows a first step of the manufacturing method. A first hole 41a is provided in a first member 41. A second hole 42a is provided in a second member 42. The second hole 42a is configured as a screw hole. The first member 41 and the second member 42 are bare materials, in other words, plates on which no brazing material 44 is provided. The latch 43 is configured as a bolt.

[0087] The latch 43 is formed of an aluminum alloy containing 1.5% or less manganese and 1.0% or less copper, as in the first embodiment. However, unlike the first embodiment, the material of the latch 43 in this embodiment is represented by a number in the 4000s of the ISO aluminum alloy standard. In other words, the material of the latch 43 is a brazing material. Aluminum alloys represented by numbers in the 4000s are aluminum-silicon alloys, and an example of such an alloy is 4043.

[0088] 19 shows the second step of the manufacturing method. A latch 43 is placed in the first hole 41a and the second hole 42a. Next, the bolt that constitutes the latch 43 is fastened to create the assembly 40. The fastening torque value when fastening the bolt is the same as in the first embodiment.

[0089] 20 shows the third step of the manufacturing method. In the furnace brazing, the latch 43 made of a brazing material melts and adheres to the first member 41 and the second member 42. When the assembly 40 is then cooled outside the furnace 93, the once-melted latch 43 is fixed to the first member 41 and the second member 42.

[0090] (2) Features The material of the latch 43 is represented by a number in the 4000 series of the ISO aluminum alloy standard. As described above, aluminum alloys represented by numbers in the 1000 series, 3000 series, and 4000 series have a lower manganese content than aluminum alloys in the 2000 series and 5000 series. Therefore, by using an aluminum alloy in the 4000 series, the wettability of the latch 43 can be improved.

[0091] Furthermore, the 4000 series aluminum alloy constituting the latch 43 is a brazing material, and therefore the galvanic current generated at the contact points between the members is negligibly small, making corrosion unlikely to occur.

[0092] (3) Modifications The modified example of the first embodiment may be applied to this embodiment.

[0093] <Conclusion> Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure described in the claims. [Explanation of symbols]

[0094] 10: Heat source unit 13: Heat source heat exchanger (heat exchanger) 20: Unit of use 23: Utilization heat exchanger 40: Assembly 41: First member 41a: 1st hole 42: Second member 42a: 2nd hole 43: Bet 43a: Sawtooth shape 44: Brazing material 51: First header (stacked header) 52: Second header (stacked header) 53:Heat exchange section 54: Refrigerant pipe 55: Finn 56: Cover 56a: Bet 57: Exterior wall material 58: Plate 59: Crimp claw 61: Gas side pipe 62: Sleeve 63: Bracket 64: Bet 71: Liquid side pipe 72: Pipe holding plate 73: Bet 81: Folding tube 82: Pipe holding plate 83: Bet 84: Pipe holding plate 92: Conveyor 93:furnace 100: Refrigeration equipment V1: First potential difference V2: Second potential difference [Prior art documents] [Patent documents]

[0095] [Patent Document 1] Patent Publication No. 2021-025718

Claims

1. a first member (41) made of aluminum and provided with a first hole (41a); a second member (42) made of aluminum and provided with a second hole (42a); a latch (43) disposed in the first hole and the second hole, fixed to the first member and the second member, and made of an aluminum alloy having a manganese content of 1.5% or less and a copper content of 1.0% or less; A heat exchanger (13).

2. Stacked headers (51, 52), Further equipped with At least one of the first member and the second member is a stacking plate (58) included in the stacked header.

2. The heat exchanger of claim 1.

3. the second hole is a screw hole, The latch surface has a sawtooth profile (43a) that engages with the screw hole.

2. The heat exchanger of claim 1.

4. a first potential difference (V1) generated by the latch and the first member contacting each other, and a second potential difference (V2) generated by the latch and the second member contacting each other, each of which is 100 mV or less; 2. The heat exchanger of claim 1.

5. The material of the latch is represented by a number in the 3000 or 4000 series of the ISO aluminum alloy standard. A heat exchanger according to any one of claims 1 to 4.

6. The aluminum alloy is represented by a number in the 3000 series of the ISO aluminum alloy standard, The latch is brazed to both the first member and the second member.

6. The heat exchanger according to claim 5.

7. The aluminum alloy is represented by a number in the 4000 series of the ISO aluminum alloy standard.

6. The heat exchanger according to claim 5.

8. A heat exchanger (13) according to claim 5, A refrigeration device (100).

9. A first aluminum member (41) having a first hole (41a) and a second aluminum member (42) having a second hole (42a) are prepared; providing a latch (43) made of an aluminum alloy having a manganese content of 1.5% or less and a copper content of 1.0% or less; creating an assembly (40) by placing the latch in the first hole and the second hole; heating the assembly in a furnace (93) to secure the latch to the first and second members; A method for manufacturing a heat exchanger (13).

10. the second hole is a screw hole, The latch is a bolt. The method of claim 9.

11. The bolt is tightened with a tightening torque of 0.3 N·m or less. The method of claim 10.

12. placing the assembly on a conveyor (92) prior to heating the assembly in the furnace; The method of claim 9.

13. The material of the latch is represented by a number in the 3000 series of the ISO aluminum alloy standard, applying a brazing material (44) to the assembly prior to heating the assembly in a furnace; The method according to any one of claims 9 to 12.

14. The material of the latch is represented by a number in the 4000 series of the ISO aluminum alloy standard, When the assembly is heated in a furnace, the latch melts. The method according to any one of claims 9 to 12.

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