Heat exchanger, method for manufacturing same, and refrigeration device

Abstract

The heat exchanger (13) comprises a first component (41), a second component (42) and a buckle (43). The first member (41) is provided with a first hole (41a) and is made of aluminum. The second member (42) is provided with a second hole (42a) and is made of aluminum. The buckle (43) penetrates through the first hole (41a) and the second hole (42a). The buckle (43) is fixed to the first member (41) and the second member (42). The clip (43) is made of an aluminum alloy having a manganese content of 1.5% or less and a copper content of 1.0% or less.

Description

Technical Field

[0001] This disclosure relates to a heat exchanger for a refrigeration unit and a method for manufacturing the same. Background Technology

[0002] The heat exchanger disclosed in Patent Document 1 (Japanese Patent Application Publication No. 2021-025718) has a stacked manifold. The stacked manifold has multiple plates. A brazing filler metal is applied to a portion of the plates. The stacked plates are fixed by brazing in a furnace, thereby obtaining the stacked manifold. Summary of the Invention

[0003] The technical problem that the invention aims to solve

[0004] During furnace brazing, the laminate is susceptible to vibration. Positional shifts in the plates caused by vibration degrade the reliability of the heat exchanger. To prevent such shifts, the laminate is temporarily secured before furnace brazing. Various methods exist for temporary securing, including welding, tube expansion, and riveting. However, these methods require specialized equipment, and therefore, the cost is passed on to the laminated manifold and the heat exchanger.

[0005] Technical solutions adopted to solve technical problems

[0006] The heat exchanger of the first viewpoint includes a first component, a second component, and a clip. The first component has a first hole and is made of aluminum. The second component has a second hole and is made of aluminum. The clip is disposed in the first hole and the second hole. The clip is fixed to the first component and the second component. The clip is made of an aluminum alloy with a manganese content of less than 1.5% and a copper content of less than 1.0%.

[0007] According to this structure, the clip is made of an aluminum alloy with a manganese content of less than 1.5% and a copper content of less than 1.0%. Therefore, it reduces the likelihood of the clip rejecting solder or experiencing galvanic corrosion, making it easy to secure the clip to the first and second components. Consequently, complex processes such as welding, tube expansion, and riveting are eliminated in the manufacturing process.

[0008] The heat exchanger of the second viewpoint is based on the heat exchanger of the first viewpoint, and further includes a stacked manifold. At least one of the first component and the second component is a plate for stacking included in the stacked manifold.

[0009] According to this structure, snap-fit ​​connectors are used for assembling stacked manifolds. Therefore, assembling stacked manifolds is easy, thus enabling cost reduction in heat exchangers.

[0010] The third-view heat exchanger is based on the first or second-view heat exchanger, with the second hole being a threaded hole. The surface of the snap fastener has a serrated shape that engages with the threaded hole.

[0011] According to this structure, the snap-fit ​​and the threaded hole engage with each other. Therefore, the first component and the second component are securely fixed.

[0012] The heat exchanger of the fourth viewpoint is based on the heat exchanger of any of the first to third viewpoints, wherein the first potential difference generated by the contact between the snap fastener and the first component, and the second potential difference generated by the contact between the snap fastener and the second component, are both below 100mV.

[0013] According to this structure, galvanic current is difficult to flow between the first or second component and the snap-fit. Therefore, metal corrosion is less likely to occur around the snap-fit.

[0014] The heat exchanger of the fifth viewpoint is based on the heat exchanger of any of the first to fourth viewpoints, and the material of the clip is indicated by the numbers of the 3000 series or 4000 series in the ISO aluminum alloy standard.

[0015] According to this structure, the snap-fit ​​is made of the same material as the first or second component, or the snap-fit ​​is made of the same material as the brazing filler metal. Therefore, galvanic corrosion is less likely to occur at the contact points between components, thus improving the reliability of the heat exchanger.

[0016] The heat exchanger of the sixth viewpoint is based on the heat exchanger of the fifth viewpoint, and the aluminum alloy is represented by the ISO aluminum alloy standard 3000 series numbers. The clips are hard-braced to both the first and second components.

[0017] According to this structure, the snap-fit ​​is made of the same material as the first or second component. Therefore, galvanic corrosion will not occur at the contact points between the components.

[0018] The heat exchanger of the seventh viewpoint is based on the heat exchanger of the fifth viewpoint, and the aluminum alloy is represented by the 4000 series of numbers in the ISO aluminum alloy standard.

[0019] According to this structure, the clips are made of brazing filler metal. Therefore, the galvanic current generated at the contact points between components is so small as to be negligible, thus reducing the likelihood of corrosion.

[0020] The refrigeration unit of the eighth viewpoint includes the heat exchanger of any one of the first to seventh viewpoints.

[0021] Based on this structure, a corrosion-resistant and inexpensive heat exchanger is installed in the refrigeration unit. Therefore, the refrigeration unit has a longer lifespan and lower costs.

[0022] The ninth method is a method for manufacturing a heat exchanger. In this method, a first aluminum component with a first hole and a second aluminum component with a second hole are prepared. A clip made of an aluminum alloy with a manganese content of 1.5% or less and a copper content of 1.0% or less is prepared. An assembly is formed by fitting the clips into the first and second holes. The assembly is heated in a furnace, thereby fixing the clips to the first and second components.

[0023] According to this method, the clip is made of an aluminum alloy with a manganese content of less than 1.5% and a copper content of less than 1.0%. Therefore, the likelihood of the clip repelling solder or experiencing galvanic corrosion is reduced, making it easy to fix the clip to the first and second components. Consequently, complex processes such as welding, tube expansion, and riveting are eliminated in the manufacturing process.

[0024] The manufacturing method for the tenth point is based on the manufacturing method for the ninth point, with the second hole being a threaded hole. The snap fastener is a bolt.

[0025] According to this structure, the snap fastener, which is configured as a bolt, engages with the second hole, which is configured as a threaded hole. Therefore, the first component and the second component are securely fixed.

[0026] The manufacturing method of the eleventh point is based on the manufacturing method of the tenth point, and the bolt is tightened with a tightening torque of less than 0.3 N·m.

[0027] According to this method, the tightening force of the bolt is relatively weak. Therefore, the possibility of the bolt being damaged is low.

[0028] The manufacturing method of the twelfth viewpoint is based on the manufacturing method of any of the ninth to eleventh viewpoints, wherein the assembly is placed on a conveyor before the assembly is heated in a furnace.

[0029] According to this method, the assembly is placed on a conveyor. Therefore, the handling within the furnace is stable.

[0030] The manufacturing method for the thirteenth viewpoint is based on the manufacturing method of any of the ninth to twelfth viewpoints, with the material of the snap-fit ​​represented by the 3000 series numbers in the ISO aluminum alloy standard. Before heating the assembly in the furnace, solder is applied to the assembly.

[0031] According to this method, the clip is made of the same material as the first or second component. Therefore, galvanic corrosion will not occur at the contact points between the components.

[0032] The manufacturing method of the fourteenth point is based on the manufacturing method of any of the ninth to twelfth points, wherein the material of the snap fastener is indicated by a number from the 4000 series in the ISO aluminum alloy standard. The snap fastener melts when the assembly is heated in a furnace.

[0033] According to this method, the clips are made of brazing filler metal. Therefore, the galvanic current generated at the contact points between components is so small as to be negligible, thus reducing the likelihood of corrosion. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the refrigeration unit 100.

[0035] Figure 2 This is a schematic diagram of the heat source heat exchanger 13.

[0036] Figure 3 This is a three-dimensional view of the heat source heat exchanger 13.

[0037] Figure 4 This is a three-dimensional diagram of a stacked manifold.

[0038] Figure 5 This is a three-dimensional view of the first manifold 51.

[0039] Figure 6 This is a three-dimensional view of the end of the first manifold 51.

[0040] Figure 7 This is a perspective view showing the connection point of the gas side pipe 61 in the first manifold 51.

[0041] Figure 8 This is a three-dimensional view of the entire second manifold 52.

[0042] Figure 9 This is a perspective view showing the holding positions of the multiple return tubes 81 in the second manifold 52.

[0043] Figure 10 This is a schematic diagram of the manufacturing equipment for the heat source heat exchanger 13.

[0044] Figure 11 This is a schematic diagram illustrating the first step of the manufacturing method according to the first embodiment.

[0045] Figure 12 This is a schematic diagram illustrating the second step of the manufacturing method according to the first embodiment.

[0046] Figure 13 This is a schematic diagram illustrating the third step of the manufacturing method according to the first embodiment.

[0047] Figure 14 This is a schematic diagram illustrating the first step of the manufacturing method of the first modified example of the first embodiment.

[0048] Figure 15 This is a schematic diagram illustrating the second step of the manufacturing method of the first modified example of the first embodiment.

[0049] Figure 16 This is a schematic diagram illustrating the third step of the manufacturing method of the first modified example of the first embodiment.

[0050] Figure 17 This is a schematic diagram illustrating a third variation of the first embodiment.

[0051] Figure 18 This is a schematic diagram illustrating the first step of the manufacturing method according to the second embodiment.

[0052] Figure 19 This is a schematic diagram illustrating the second step of the manufacturing method according to the second embodiment.

[0053] Figure 20 This is a schematic diagram illustrating the third step of the manufacturing method according to the second embodiment.

[0054] Figure 21 This diagram illustrates the poor wettability between the clip 43 and the brazing filler metal 44.

[0055] Figure 22 This diagram illustrates the state where the wettability between the clip 43 and the brazing filler metal 44 is at a moderate level.

[0056] Figure 23 This diagram illustrates the good wettability between the clip 43 and the brazing filler metal 44. Detailed Implementation

[0057] <Common Structure Across Implementation Methods>

[0058] (1) Overall structure

[0059] Figure 1 This is a schematic diagram of a refrigeration unit 100. The refrigeration unit 100 can be an air conditioning unit, a freezer, a refrigerator, a water heater, a floor heating system, etc. The refrigeration unit 100 has a heat source unit 10, a utilization unit 20, and a refrigerant connecting piping assembly 30. These constitute a refrigerant circuit for circulating the refrigerant. Additionally, the refrigeration unit 100 has a communication line 39.

[0060] (2) Detailed structure

[0061] (2-1) Heat source unit 10

[0062] The heat source unit 10 is used to obtain cold or warm heat from a heat source. The heat source unit 10 includes a heat source housing 105, a compressor 11, a four-way reversing valve 12, a heat source heat exchanger 13, a heat source fan 14, a heat source expansion valve 15, a storage tank 16, a liquid shut-off valve 17, a gas shut-off valve 18, and a heat source control unit 19.

[0063] The compressor 11 draws in low-pressure gaseous refrigerant through the suction pipe 11a and discharges high-pressure gaseous refrigerant generated by its compression through the discharge pipe 11b.

[0064] The four-way reversing valve 12 is connected as shown by the solid line when operating in cold and hot mode, and connected as shown by the dashed line when operating in warm and hot mode.

[0065] In operation with both heating and cooling, the heat source heat exchanger 13 functions as a condenser. In this case, the heat source heat exchanger 13 receives high-pressure gaseous refrigerant from the gas-side pipe 61 and discharges high-pressure liquid refrigerant from the liquid-side pipe 71. Conversely, in operation with both heating and cooling, the heat source heat exchanger 13 functions as an evaporator. In this case, the heat source heat exchanger 13 receives low-pressure gas-liquid two-phase refrigerant from the liquid-side pipe 71 and discharges low-pressure gaseous refrigerant from the gas-side pipe 61. Detailed structure of the heat source heat exchanger 13 will be described later.

[0066] The heat source fan 14 promotes heat exchange in the heat source heat exchanger 13 by generating an airflow through the heat source heat exchanger 13.

[0067] The heat source expansion valve 15 reduces the pressure of the high-pressure liquid refrigerant, thereby generating a low-pressure gas-liquid two-phase refrigerant.

[0068] Storage tank 16 separates the liquid components contained in the gaseous refrigerant and stores them in the container.

[0069] Liquid shut-off valve 17 and gas shut-off valve 18 are components designed to be closed when an operator disconnects the refrigerant circuit.

[0070] The heat source control unit 19 acquires the output values ​​of various sensors and controls various actuators.

[0071] (2-2) Using Unit 20

[0072] The utilization unit 20 is used to provide cold or hot or warm water to the user. The utilization unit 20 includes a utilization housing 205, a utilization heat exchanger 23, a utilization fan 24, and a utilization control unit 29.

[0073] The heat exchanger 23 functions as an evaporator when operating for both hot and cold heat, and as a condenser when operating for both warm and cold heat.

[0074] The fan 24 generates an airflow through the heat exchanger 23, thereby promoting heat exchange in the heat exchanger 23. Furthermore, if the refrigeration unit 100 is an air conditioning unit, the fan 24 delivers conditioned air to the user.

[0075] The control unit 29 acquires the output values ​​of various sensors, controls various actuators, and communicates with the heat source control unit 19.

[0076] (2-3) Refrigerant connecting piping assembly 30

[0077] The refrigerant connection piping assembly 30 includes a liquid connection piping 31 and a gas connection piping 32. The liquid connection piping 31 connects the liquid shut-off valve 17 to the heat exchanger 23. The gas connection piping 32 connects the gas shut-off valve 18 to the heat exchanger 23.

[0078] (2-4) Communication line 39

[0079] Communication line 39 connects the heat source control unit 19 and the utilization control unit 29. The heat source control unit 19 and the utilization control unit 29 send and receive commands, status and data via communication line 39.

[0080] <First Implementation>

[0081] (1) Detailed structure of heat source heat exchanger 13

[0082] Figure 2 The structure of the heat source heat exchanger 13 according to the first embodiment is schematically shown. The heat source heat exchanger 13 includes a first manifold 51, a second manifold 52, a heat exchange section 53, a gas-side pipe 61, a liquid-side pipe 71, and a return pipe 81.

[0083] (1-1) First manifold 51

[0084] The first manifold 51 is a stacked manifold with multiple stacked plates. The plates used for stacking are made of aluminum, and their material is typically indicated by the 3000 series numbers of the ISO aluminum alloy standard. Aluminum alloys indicated by the 3000 series numbers are aluminum-manganese alloys, and examples include 3003 and 3004, etc.

[0085] The first manifold 51 has a first gas chamber 51a and a first liquid chamber 51b through holes and other parts in the plate. Multiple first gas chambers 51a and first liquid chambers 51b may be provided respectively. A portion of the plate functions as a first partition wall 51c separating 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 manifold 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.

[0086] (1-2) Second manifold 52

[0087] Like the first manifold 51, the second manifold 52 is a stacked manifold with multiple stacked plates. The material of the plates is typically indicated by the 3000 series numbers of the ISO aluminum alloy standard. Through the openings and other portions of the plates, the second manifold 52 has a second gas chamber 52a and a second liquid chamber 52b. Multiple second gas chambers 52a and second liquid chambers 52b may be provided respectively. A portion of the plate functions as a second partition wall 52c separating the second gas chamber 52a and the second liquid chamber 52b. A return pipe 81 is connected to the second manifold 52. The second gas chamber 52a and the second liquid chamber 52b are interconnected via the return pipe 81.

[0088] (1-3) Heat exchange section 53

[0089] The heat exchange section 53 has a plurality of refrigerant pipes 54 and a plurality of fins 55 mounted on the refrigerant pipes 54. Each of the plurality of refrigerant pipes 54 is connected to a first gas chamber 51a and a second gas chamber 52a, or to a first liquid chamber 51b and a second liquid chamber 52b.

[0090] Figure 3 The structure of the heat source heat exchanger 13 is realistically shown. The heat exchange section 53 is formed as a wall that rises vertically and appears L-shaped when viewed from above.

[0091] (1-4) Periphery of gas side pipe 61

[0092] Figure 4 The structure of the end of the first manifold 51 is shown. The first manifold 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 rivet claws 59. The plurality of rivet claws 59 constrain 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 composite material to which rolled brazing filler metal has been applied. The plurality of plates 58 and the outer wall member 57 are fixed together by furnace brazing.

[0093] Figure 5 The first manifold 51 is shown as a whole. From this figure, it can also be understood that the gas-side pipe 61 and the liquid-side pipe 71 are connected to the first manifold 51. A cover 56 is provided around the periphery of the gas-side pipe 61, and the cover 56 forms a refrigerant flow path by covering multiple plates 58. Figure 6 As shown, the cover 56 is secured to the plate 58 by a latch 56a before brazing in the furnace. The latch 56a is a threaded bolt. The latch 56a is used to prevent positional misalignment between the cover 56, the plate 58, and the outer wall member 57 during brazing in the furnace.

[0094] like Figure 7As shown, a bushing 62, a bracket 63, and a latch 64 are provided at the connection between the cover 56 and the gas-side pipe 61. An opening is provided on the cover 56 at the location where the bushing 62 is installed, allowing refrigerant exchange between the gas-side pipe 61 and the first manifold 51. The bushing 62 is a composite material that secures the cover 56 and the gas-side pipe 61 together by furnace brazing. Before furnace brazing, the bracket 63 is constrained to both the cover 56 and the bushing 62 by the latch 64. The latch 64 is a threaded bolt. The latch 64 is used to prevent positional misalignment between the cover 56 and the bushing 62 during furnace brazing.

[0095] (1-5) Periphery of liquid side pipe 71

[0096] Back Figure 5 A pipe retaining plate 72 is provided around the periphery of the liquid-side pipe 71, which is connected to one end of the first manifold 51. The pipe retaining plate 72 is secured to the first manifold 51 by a latch 73 before brazing in the furnace. The latch 73 is a threaded bolt. The latch 73 is used to suppress positional displacement between the pipe retaining plate 72 and the first manifold 51 during brazing in the furnace.

[0097] (1-6) Periphery of the return tube 81

[0098] Refer again Figure 4 , Figure 4 The structure of the second manifold 52 is also shown. The structure of the second manifold 52 is the same as that of the first manifold 51.

[0099] Figure 8 The second manifold 52 is shown as a whole. As can be understood from this figure, multiple return pipes 81 are connected to the second manifold 52. Multiple pipe retaining plates 82 are provided around the periphery of the return pipes 81. Before brazing in the furnace, the pipe retaining plates 82 are secured to the plate 58 by latches 83, such as bolts. The latches 83 are threaded bolts. The latches 83 are used to suppress positional misalignment between the pipe retaining plates 82 and the plate 58 during brazing in the furnace.

[0100] like Figure 9 As shown, a tube holding plate 84 is also provided to hold multiple folded tubes 81 together. Before brazing in the furnace, the tube holding plate 84 is constrained to the plate 58 by bolts or other clips 83, thereby suppressing the positional displacement between the tube holding plate 84 and the plate 58.

[0101] (2) Manufacturing method

[0102] Figure 10 The manufacturing equipment for the heat source heat exchanger 13 is shown. First, a first component 41, a second component 42, and a latch 43 are prepared on a mounting platform 91. The first component 41 and the second component 42 are components that are fixed to each other by brazing in a furnace, and at least one of them is a composite material.

[0103] The first component 41 includes a cover 56 around the gas-side pipe 61, a pipe retaining plate 72 around the liquid-side pipe 71, and a pipe retaining plate 82 around the return pipe 81.

[0104] The second component 42 refers to the bushing 62, plate 58 and in some cases the cover 56 around the gas side pipe 61, the plate 58 around the liquid side pipe 71 and the plate 58 around the return pipe 81, etc.

[0105] Clip 43 refers to clips 56a and 64 around the gas side pipe 61, clip 73 around the liquid side pipe 71, and clip 83 around the return pipe 81.

[0106] Figures 11 to 13 A manufacturing method according to the first embodiment is shown. Figure 11 This is the first step in the manufacturing process. The first component 41 has a first hole 41a. The first hole 41a penetrates the first component 41. The first component 41 is a composite material, in other words, a plate provided with brazing filler metal 44. The second component 42 has a second hole 42a. The second hole 42a is configured as a through hole penetrating the second component 42. The second hole 42a is configured as a threaded hole. A snap fastener 43 is used to constrain the first component and the second component for temporary fixation. The snap fastener 43 is configured as a bolt. The surface of the snap fastener 43, which is a bolt, has a serrated shape 43a that engages with the threaded teeth of the second hole 42a, which is a threaded hole. The snap fastener 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. Alternatively, the manganese content of the snap fastener 43 may also be 1.0% or less. In this embodiment, the material of the snap fastener 43 is represented by the 3000 series numbers of the ISO aluminum alloy standard. Aluminum alloys represented by the numbers in the 3000 series are aluminum-manganese alloys. Examples of such alloys include 3003 and 3004.

[0107] A first potential difference V1 is generated when the latch 43 contacts the first component 41. A second potential difference V2 is generated when the latch 43 contacts the second component 42. Both the first potential difference V1 and the second potential difference V2 are below 100mV.

[0108] Figure 12 This is the second step in the manufacturing process. The clip 43 is positioned in the first hole 41a and the second hole 42a. Next, the assembly 40 is manufactured by tightening the bolts formed by the clips 43. The tightening torque when tightening the bolts is 0.3 N·m or less.

[0109] Next, as Figure 10 As shown, assembly 40 is placed on conveyor 92. Conveyor 92 moves assembly 40 slowly through furnace 93. Furnace brazing is performed by heating assembly 40 inside furnace 93.

[0110] Figure 13 This is the third step in the manufacturing process. Molten solder 44 from the composite material attaches the clip 43 to the first component 41 and the second component 42. Then, as the assembly 40 cools outside the furnace 93, the clip 43 is secured to the first component 41 and the second component 42.

[0111] (3) Characteristics

[0112] (3-1)

[0113] Generally, when brazing a base material, good "wettability" between the base material and the filler metal is required. Wettability refers to the affinity between the base material and the filler metal. Figures 21-23 This diagram illustrates the wettability between the snap-fit ​​43 (as the base material) and the solder 44. Wettability can be observed as the contact angle θ between the solid snap-fit ​​43 and the liquid solder 44. Figure 21 It is a state where the wettability between the clip 43 and the brazing filler metal 44 is poor, and the contact angle θ is a large value of 180°. Figure 22 The wettability between the clip 43 and the brazing filler metal 44 is at a moderate level, and the contact angle θ is a smaller value such as 90°. Figure 23 The snap-fit ​​43 and the brazing filler metal 44 have good wettability, and the contact angle θ is a smaller value than 90°.

[0114] When the manganese content of the base metal is low, the wettability of the solder when placed on the base metal is improved. On the other hand, when the manganese content of the base metal is high, the wettability deteriorates because the oxide coating formed on the base metal becomes more robust. The material of the clip 43 is designated by the 3000 series of the ISO aluminum alloy standard. Aluminum alloys designated by the 1000, 3000, and 4000 series have a lower manganese content than aluminum alloys of the 2000 and 5000 series. Therefore, by using a 3000 series aluminum alloy, the wettability of the clip 43 can be improved. Furthermore, the clip 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. The manganese content of 1.5% or less is low enough to ensure wettability. In addition, when the manganese content of the clip 43 is 1.0% or less, the wettability is further improved.

[0115] Therefore, the likelihood of the clip 43 rejecting the solder or experiencing galvanic corrosion can be reduced, making it easy to secure the clip 43 to the first component 41 and the second component 42. Consequently, complex processes such as welding, tube expansion, and riveting are eliminated in the manufacturing process. Furthermore, this can sometimes avoid the increased cost of the heat exchanger due to the specialized equipment required for these complex processes.

[0116] (3-2)

[0117] Clip 43 is used for assembling the stacked manifold. Therefore, the assembly of the stacked manifold is easy, thus enabling cost reduction of the heat source heat exchanger 13.

[0118] (3-3)

[0119] The clip 43, which acts as a bolt, engages with the second hole 42a, which acts as a threaded hole. Therefore, the first component 41 and the second component 42 are securely fixed.

[0120] (3-4)

[0121] The clip 43 is made of the same material as the first component 41 or the second component 42. Therefore, galvanic corrosion will not occur at the contact points between the components.

[0122] (3-5)

[0123] The tightening torque value when fastening the clip 43, which acts as a bolt, is relatively small, less than 0.3 N·m. Therefore, the possibility of the bolt, which is made of a material with insufficient hardness, failing is low.

[0124] (3-6)

[0125] During the manufacture of the heat source heat exchanger 13, the assembly 40 is placed on the conveyor 92. Since the conveyor 92 is a source of vibration, it is possible to induce or cause positional displacement between the components constituting the assembly 40. However, the assembly 40 is temporarily fixed by the clips 43, and the positional displacement is suppressed. Therefore, the handling in the furnace is less likely to adversely affect the quality of the heat source heat exchanger 13.

[0126] (4) Variations

[0127] Hereinafter, variations of the first embodiment will be described. Multiple variations may also be combined.

[0128] (4-1) First variation

[0129] In the first embodiment, the second hole 42a is configured as a threaded hole. Furthermore, the snap fastener 43 is configured as a bolt. However, alternatively, the second hole 42a may not be specifically configured as a threaded hole. Alternatively, the snap fastener 43 may be configured as a bar without threads. Alternatively, either of the above is acceptable.

[0130] Figures 14-16 A manufacturing method for a first variation of the first embodiment is shown. Figure 14 This is the first step in the manufacturing process. It is understandable that the second hole 42a is not a threaded hole, and the snap fastener 43 is a bar without threads.

[0131] Figure 15This is the second step in the manufacturing process. The snap fastener 43 is positioned 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 gap is reduced, thereby suppressing positional misalignment of the first member 41 and the second member 42.

[0132] Figure 16 This is the third step in the manufacturing process. Molten solder 44 from the composite material attaches the clip 43 to the first component 41 and the second component 42. Then, as the assembly 40 cools outside the furnace 93, the clip 43 is secured to the first component 41 and the second component 42.

[0133] (4-2) Second variation

[0134] In the first embodiment, the brazing filler metal 44, applied to the first component 41 or the second component 42 which is configured as a composite material, contributes to the brazing in the furnace. Alternatively, both the first component and the second component 42 may be prepared as bare materials, with the brazing filler metal, separate from the first component and the second component, disposed at the joint of the two.

[0135] (4-3) Third variation

[0136] In the first embodiment, the second hole 42a is configured as a through hole penetrating the second member 42. Alternatively, it can be as follows: Figure 17 As shown, the second hole 42a is configured as a recess with a closed end.

[0137] <Second Implementation>

[0138] (1) Structure

[0139] The second embodiment is very similar to the first embodiment in structure, but differs in material. The manufacturing method of the second embodiment will be described below, and the difference in material will also be mentioned.

[0140] Figures 18-20 A manufacturing method according to the second embodiment is shown. Figure 18 This is the first step in the manufacturing process. The first component 41 has a first hole 41a. The second component 42 has a second hole 42a. The second hole 42a is a threaded hole. The first component 41 and the second component 42 are bare materials; in other words, they are plates without brazing filler metal 44. The clip 43 is a bolt.

[0141] Like the first embodiment, the snap fastener 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. However, unlike the first embodiment, in this embodiment, the material of the snap fastener 43 is represented by a number from the ISO aluminum alloy standard 4000 series. In other words, the material of the snap fastener 43 is brazing filler metal. Aluminum alloys represented by numbers from the 4000 series are aluminum-silicon alloys; examples include 4043, etc.

[0142] Figure 19 This is the second step in the manufacturing process. The clip 43 is disposed in the first hole 41a and the second hole 42a. Next, the assembly 40 is manufactured by tightening the bolts formed by the clips 43. The tightening torque value when tightening the bolts is the same as in the first embodiment.

[0143] Figure 20 This is the third step in the manufacturing process. During brazing in the furnace, the clips 43, made of brazing filler metal, melt and adhere to the first component 41 and the second component 42. Subsequently, when the assembly 40 is cooled outside the furnace 93, the once-molten clips 43 are fixed to the first component 41 and the second component 42.

[0144] (2) Characteristics

[0145] The material of snap fastener 43 is designated by the ISO aluminum alloy standard 4000 series. As mentioned earlier, aluminum alloys designated by the 1000, 3000, and 4000 series have a lower manganese content than those of the 2000 and 5000 series. Therefore, by using a 4000 series aluminum alloy, the wettability of snap fastener 43 can be improved.

[0146] Furthermore, the 4000 series aluminum alloy that constitutes the clip 43 is a brazing filler metal. Therefore, the galvanic current generated at the contact points between components is so small as to be negligible, thus reducing the likelihood of corrosion.

[0147] (3) Variations

[0148] The variations of the first embodiment can be applied to this embodiment.

[0149] <Conclusion>

[0150] The embodiments of this disclosure have been described above, but it should be understood that various changes in form and detail can be made without departing from the spirit and scope of this disclosure as set forth in the claims.

[0151] Symbol Explanation

[0152] 10 Heat source units; 13. Heat source heat exchanger (heat exchanger); 20. Utilization Unit; 23. Utilize heat exchangers; 40 Assemblies; 41. First component; 41a First hole; 42. Second component; 42a Second hole; 43. Buckle; 43a Serrated shape; 44. Brazing filler metal; 51 First manifold (stacked manifold); 52 Second manifold (stacked manifold); 53. Heat exchange section; 54 Refrigerant pipe 55. Fins; 56. Cover; 56a Buckle; 57. External wall components; 58 boards; 59. Riveting claws; 61. Gas side tube; 62 Bushing; 63. Support; 64. Buckle; 71. Liquid side tube; 72 tube retainer plate; 73. Buckle; 81. Turnback tube; 82 tube retainer plate; 83. Buckle; 84 tube retainer plate; 92 Conveyor; 93 furnaces; 100 Refrigeration unit; V1 First potential difference; V2 Second potential difference.

[0153] Existing technical documents

[0154] Patent documents

[0155] Patent Document 1: Japanese Patent Application Publication No. 2021-025718

Claims

1. A heat exchanger (13), characterized in that, include: A first aluminum component (41) having a first hole (41a). A second aluminum component (42), the second component having a second hole (42a); and The buckle (43) is disposed in the first hole and the second hole, fixed to the first component and the second component, and is made of an aluminum alloy with a manganese content of less than 1.5% and a copper content of less than 1.0%.

2. The heat exchanger according to claim 1, characterized in that, The heat exchanger also includes stacked manifolds (51, 52). At least one of the first component and the second component is a stacked plate (58) included in the stacked manifold.

3. The heat exchanger according to claim 1 or 2, characterized in that, The second hole is a threaded hole. The surface of the buckle has a serrated shape (43a) that engages with the threaded hole.

4. The heat exchanger according to any one of claims 1 to 3, characterized in that, The first potential difference (V1) generated by the buckle in contact with the first component and the second potential difference (V2) generated by the buckle in contact with the second component are both below 100mV.

5. The heat exchanger according to any one of claims 1 to 4, characterized in that, The material of the buckle is indicated by the numbers 3000 or 4000 in the ISO aluminum alloy standard.

6. The heat exchanger according to claim 5, characterized in that, The aluminum alloy is represented by the 3000 series of numbers in the ISO aluminum alloy standard. The buckle is brazed to both the first component and the second component.

7. The heat exchanger according to claim 5, characterized in that, The aluminum alloy is represented by the 4000 series of numbers in the ISO aluminum alloy standard.

8. A refrigeration apparatus (100), characterized in that, The heat exchanger (13) includes any one of claims 1 to 7.

9. A method for manufacturing a heat exchanger (13), characterized in that, Prepare an aluminum first component (41) with a first hole (41a) and an aluminum second component (42) with a second hole (42a). Prepare a buckle (43), the buckle being made of an aluminum alloy with a manganese content of less than 1.5% and a copper content of less than 1.0%. The assembly (40) is made by configuring the buckle in the first hole and the second hole. The snap fastener is secured to the first component and the second component by heating the assembly in a furnace (93).

10. The manufacturing method according to claim 9, characterized in that, The second hole is a threaded hole. The buckle is a bolt.

11. The manufacturing method according to claim 10, characterized in that, The bolt is tightened with a tightening torque of less than 0.3 N·m.

12. The manufacturing method according to any one of claims 9 to 11, characterized in that, Before heating the assembly in the furnace, the assembly is placed on a conveyor (92).

13. The manufacturing method according to any one of claims 9 to 12, characterized in that, The material of the buckle is specified by the 3000 series numbers in the ISO aluminum alloy standard. Before heating the assembly in a furnace, brazing filler metal (44) is applied to the assembly.

14. The manufacturing method according to any one of claims 9 to 12, characterized in that, The material of the buckle is specified by the 4000 series numbers in the ISO aluminum alloy standard. When the assembly is heated in the furnace, the snap-fit ​​melts.

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