Heat exchanger and method of manufacturing a heat exchanger

Abstract

The heat exchanger includes: a heat transfer tube assembly consisting of multiple heat transfer tubes having internal flow paths for refrigerant flow, the multiple heat transfer tubes arranged in the width direction being arranged in multiple rows along the length direction; fins disposed on the heat transfer tubes to facilitate heat exchange between the refrigerant flowing inside the heat transfer tubes and the air; and a cross-row manifold for inserting the ends of the heat transfer tubes to allow refrigerant to flow between the heat transfer tubes arranged in the width direction of the heat transfer tube assembly, the cross-row manifold having: a flat base having insertion holes for inserting each end of the heat transfer tubes; a corrugated plate formed as a continuous corrugated plate with corrugated crests and corrugated troughs, the corrugated crests respectively covering a set of insertion holes arranged in the width direction, the corrugated troughs respectively contacting the base on both sides of the insertion holes in the length direction of the base, forming a manifold flow path for refrigerant flow between the corrugated plate and the base for each heat transfer tube arranged in the width direction of the heat transfer tube assembly; and a cover plate covering the corrugated plate and pressing the corrugated plate toward the base side.

Description

Technical Field

[0001] This disclosure relates to a heat exchanger having cross-row manifolds and a method of manufacturing the heat exchanger. Background Technology

[0002] Conventionally, heat exchangers are known to have a pair of opposing heat transfer tubes arranged in parallel as a first and second row. In such heat exchangers, a cross-row manifold for inserting the ends of the heat transfer tubes is formed such that the refrigerant flows only between the pair of heat transfer tubes. That is, in the cross-row manifold, the refrigerant flowing in from the heat transfer tubes arranged in the first row does not merge with the refrigerant flowing in from the other heat transfer tubes arranged in the first row. Patent Document 1 discloses a heat exchanger with a cross-row manifold, which consists of a base for inserting heat transfer tubes and a corrugated plate disposed on the base and formed as a continuous semi-cylindrical portion. Each semi-cylindrical portion of the corrugated plate covers the portion for inserting a pair of heat transfer tubes, and a flow path is formed between the corrugated plate and the base.

[0003] Patent Document 1: Patent No. 5786877

[0004] However, the heat exchanger in Patent Document 1 requires thick-walled corrugated plates to prevent deformation due to the pressure of the refrigerant flowing in the cross-row manifolds. Generally, thick-walled corrugated plates tend to interfere with or cover the insertion points of the heat transfer tubes. Because the corrugated plates in the heat exchanger of Patent Document 1 are thick-walled, the area in the base available for inserting heat transfer tubes is reduced. Therefore, in the heat exchanger of Patent Document 1, the number and spacing of heat transfer tubes inserted into the cross-row manifolds are limited, reducing design flexibility. Summary of the Invention

[0005] This disclosure is made to solve the aforementioned problems, and provides a heat exchanger and a method for manufacturing the heat exchanger that can adjust the number and spacing of heat transfer tubes inserted into the cross-row manifold, thereby increasing the design flexibility.

[0006] The heat exchanger disclosed herein comprises: a heat transfer tube assembly consisting of multiple heat transfer tubes having internally formed flow paths for refrigerant flow, and the multiple heat transfer tubes arranged along the width direction are arranged in multiple rows along the length direction; fins disposed on the heat transfer tubes to facilitate heat exchange between the refrigerant flowing inside the heat transfer tubes and the air; and a cross-row manifold for inserting the ends of the heat transfer tubes to allow refrigerant to flow between the heat transfer tubes arranged along the width direction of the heat transfer tube assembly, the cross-row manifold having: a flat plate base having insertion holes for inserting each end of the heat transfer tubes; a corrugated plate formed as a continuous corrugated plate with corrugated crests and corrugated troughs, and configured such that the corrugated crests cover the set of insertion holes arranged along the width direction, and the corrugated troughs contact the base on both sides of the insertion holes in the length direction of the base, forming a manifold flow path for refrigerant flow between the corrugated plate and the base for the heat transfer tubes arranged along the width direction of each heat transfer tube assembly; and a cover plate covering the corrugated plate and pressing the corrugated plate toward the base side.

[0007] The disclosed method for manufacturing a heat exchanger includes a step of assembling a heat transfer tube assembly, fins, and cross-row manifolds, and a step of brazing the heat transfer tube assembly, fins, and cross-row manifolds. The heat transfer tube assembly consists of multiple heat transfer tubes with internal flow paths for refrigerant flow, and the multiple heat transfer tubes arranged along the width direction are arranged in multiple rows along the length direction. Fins are disposed on the heat transfer tubes to promote heat exchange between the refrigerant flowing inside the heat transfer tubes and the air. Cross-row manifolds are used to insert the ends of the heat transfer tubes, allowing... The refrigerant flows between heat transfer tubes arranged along the width direction of the heat transfer tube assembly. The assembly process includes: a step of embedding a corrugated plate of the cross-row manifold into a base of a cross-row manifold having insertion holes formed for inserting into each end of the heat transfer tubes, wherein the crest of a corrugated plate formed as a continuous crest and trough is respectively configured to cover a set of insertion holes arranged along the width direction, and the trough of the corrugated plate respectively contacts the base on both sides of the insertion holes in the length direction of the base; and a step of installing a cover plate to cover the corrugated plate.

[0008] According to this disclosure, the cross-row manifold includes a cover plate that presses the corrugated plates towards the base side. Therefore, the corrugated plates suppress deformation caused by the pressure of the refrigerant flowing in the cross-row manifold. That is, the corrugated plates do not need to be thick-walled to suppress deformation caused by the pressure of the refrigerant flowing in the cross-row manifold. Therefore, the heat exchanger can adjust the number and spacing of the heat transfer tubes inserted into the cross-row manifold, increasing design flexibility. Attached Figure Description

[0009] Figure 1 This is a circuit diagram representing the air conditioner 1 in embodiment 1.

[0010] Figure 2 This is a perspective view of the heat exchanger 7 in Embodiment 1.

[0011] Figure 3 This is a side view showing the cross-column manifold 24 of embodiment 1.

[0012] Figure 4 This is a perspective view of the cross-row manifold 24 in embodiment 1.

[0013] Figure 5 This is a perspective view of the cross-row manifold 24 in embodiment 1.

[0014] Figure 6 This is a perspective view of the base 31 in embodiment 1.

[0015] Figure 7 This is a perspective view of the base 31 in embodiment 1.

[0016] Figure 8 This is a structural diagram showing the cross-column manifold 24 of embodiment 1.

[0017] Figure 9 This is a perspective view of the cross-row manifold 24 in embodiment 1.

[0018] Figure 10 This is a perspective view of the cross-row manifold 24, which represents a modified example of embodiment 1.

[0019] Figure 11 This is a structural diagram of the cross-row manifold 24, which represents a modified example of embodiment 1.

[0020] Figure 12 This is a perspective view showing the cross-row manifold 124 of embodiment 2.

[0021] Figure 13 This is a perspective view showing the cross-row manifold 124 of embodiment 2.

[0022] Figure 14 This is a perspective view showing the cross-row manifold 124 of embodiment 2.

[0023] Figure 15 This is a structural diagram showing the cross-column manifold 124 of embodiment 2.

[0024] Figure 16 This is a perspective view of the cover plate 134 in embodiment 2.

[0025] Figure 17 This is a perspective view showing the cross-row manifold 124 of embodiment 2.

[0026] Figure 18 This is a perspective view of the wave plate 232 in embodiment 3.

[0027] Figure 19 This is a diagram illustrating the manufacturing method of the heat exchanger 207 in Embodiment 3.

[0028] Figure 20 This is a diagram showing whether the lower heating pre-hole 280d is blocked during brazing in Embodiment 3, based on the width Wd and peak temperature of each pre-heating hole.

[0029] Figure 21 This is a diagram showing whether the upper heating pre-hole 280u is blocked during brazing in Embodiment 3, based on the width Wu and peak temperature of each pre-heating hole.

[0030] Figure 22 This is a side view showing the brazed corrugated plate 232 of embodiment 3.

[0031] Figure 23 This is a diagram illustrating the manufacturing method of the heat exchanger 307 in Embodiment 4.

[0032] Figure 24 This is a perspective view of the cross-row manifold 424 in embodiment 5.

[0033] Figure 25 This is a perspective view of the cross-row manifold 424 in embodiment 5.

[0034] Figure 26 This is a perspective view of the base 431 in embodiment 5. Detailed Implementation

[0035] Implementation method 1.

[0036] Hereinafter, the air conditioner 1 equipped with the heat exchanger 7 of Embodiment 1 will be described with reference to the accompanying drawings. Alternatively, the heat exchanger 7 may also be installed in a device other than the air conditioner 1. Figure 1 This is a circuit diagram representing the air conditioner 1 in embodiment 1. For example... Figure 1 As shown, air conditioner 1 includes an outdoor unit 2, an indoor unit 3, and refrigerant piping 4. Additionally, although in Figure 1 The example shows one indoor unit 3, but the number of indoor units 3 can also be two or more.

[0037] (Outdoor unit 2, Indoor unit 3, Refrigerant piping 4)

[0038] Outdoor unit 2 includes compressor 5, flow path switching device 6, heat exchanger 7, outdoor fan 8, and expansion unit 9. Indoor unit 3 includes indoor heat exchanger 11 and indoor fan 12. Refrigerant piping 4 connects compressor 5, flow path switching device 6, heat exchanger 7, expansion unit 9, and indoor heat exchanger 11, and supplies refrigerant flow inside, thereby forming a refrigerant circuit.

[0039] (5. Compressor, 6. Flow path switching device, 7. Heat exchanger, 8. Outdoor blower, 9. Expansion section)

[0040] Compressor 5 draws in refrigerant at low temperature and low pressure, compresses the drawn-in refrigerant into a high-temperature and high-pressure state, and then discharges it. A flow path switching device 6, for example, a four-way valve, switches the flow direction of the refrigerant in the refrigerant circuit. Heat exchanger 7 facilitates heat exchange between the refrigerant and outdoor air. Heat exchanger 7 functions as a condenser during cooling operation and as an evaporator during heating operation. Outdoor fan 8 supplies outdoor air to heat exchanger 7. Expansion section 9 is a pressure-reducing valve or expansion valve that depressurizes the refrigerant to cause it to expand.

[0041] (Indoor heat exchanger 11, indoor fan 12)

[0042] The indoor heat exchanger 11 exchanges heat between indoor air and refrigerant. The indoor heat exchanger 11 functions as an evaporator during cooling operation and as a condenser during heating operation. The indoor fan 12 is a device that supplies indoor air to the indoor heat exchanger 11.

[0043] (Refrigeration operation)

[0044] Here, the operation of air conditioner 1 will be explained. First, the cooling operation will be explained. During cooling operation, the refrigerant drawn into compressor 5 is compressed by compressor 5 and discharged in a high-temperature and high-pressure gaseous state. The high-temperature and high-pressure gaseous refrigerant discharged from compressor 5 flows into heat exchanger 7, which functions as a condenser, through flow path switching device 6. The refrigerant flowing into heat exchanger 7 exchanges heat with outdoor air supplied by outdoor fan 8, condensing and liquefying. The liquid refrigerant flows into expansion section 9, where it is depressurized and expanded, becoming a low-temperature and low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant flows into indoor heat exchanger 11, which functions as an evaporator. The refrigerant flowing into indoor heat exchanger 11 exchanges heat with indoor air supplied by indoor fan 12, evaporating and vaporizing. At this time, the indoor air is cooled, and indoor cooling is achieved. Afterward, the evaporated low-temperature and low-pressure gaseous refrigerant is drawn into compressor 5 through flow path switching device 6.

[0045] (Heating operation)

[0046] Next, the heating operation will be explained. During heating operation, the refrigerant drawn into compressor 5 is compressed by compressor 5 and discharged as a high-temperature, high-pressure gaseous state. The high-temperature, high-pressure gaseous refrigerant discharged from compressor 5 flows into indoor heat exchanger 11, which functions as a condenser, via flow path switching device 6. The refrigerant flowing into indoor heat exchanger 11 exchanges heat with indoor air supplied by indoor fan 12, condensing and liquefying. At this time, the indoor air is heated, thus implementing indoor heating. The liquid refrigerant flows into expansion section 9, where it is depressurized and expanded, becoming a low-temperature, low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant flows into heat exchanger 7, which functions as an evaporator. The refrigerant flowing into heat exchanger 7 exchanges heat with outdoor air supplied by outdoor fan 8, evaporating and vaporizing. Afterward, the evaporated low-temperature, low-pressure gaseous refrigerant is drawn into compressor 5 via flow path switching device 6.

[0047] (Heat exchanger 7)

[0048] Figure 2 This is a perspective view of the heat exchanger 7 according to Embodiment 1. The structure of the heat exchanger 7 will be described in detail here. The heat exchanger 7 includes a heat transfer tube assembly 20, fins 22, a first lower manifold 23, a cross-row manifold 24, and a second lower manifold 25. Alternatively, an indoor heat exchanger 11 with the same structure as the heat exchanger 7 can also be applied.

[0049] (Heat transfer tube assembly 20, fins 22)

[0050] The heat transfer tube assembly 20 is formed by arranging multiple heat transfer tubes 21 along the width direction in multiple rows along the length direction. The heat transfer tubes 21 are, for example, flat tubes, and have multiple flow paths (not shown) formed inside for refrigerant flow. In this embodiment 1, the heat transfer tubes 21 extend in the vertical direction. Alternatively, the heat transfer tubes 21 may extend in a direction other than vertical. In this case, other components of the heat exchanger 7 are also assembled in accordance with the extension direction of the heat transfer tubes 21. Furthermore, in this embodiment 1, the heat transfer tubes 21 are arranged in two parallel rows, namely, a first row and a second row. Alternatively, there may be three or more rows of heat transfer tubes 21. The fins 22, for example, are corrugated fins, provided on the heat transfer tubes 21 to promote heat exchange between the refrigerant flowing inside the heat transfer tubes 21 and the air.

[0051] (First lower manifold 23)

[0052] The first lower manifold 23 is a manifold into which one end of each of the heat transfer tubes 21 arranged in the first row is inserted. A refrigerant pipe 4 is connected to the first lower manifold 23. The first lower manifold 23 distributes the refrigerant flowing from the refrigerant pipe 4 to the heat transfer tubes 21 arranged in the first row. Additionally, the first lower manifold 23 allows the refrigerant merging from the heat transfer tubes 21 arranged in the first row to flow out of the refrigerant pipe 4.

[0053] (Spanning column manifold 24)

[0054] The cross-row manifold 24 is disposed opposite to the first lower manifold 23 and the second lower manifold 25, and is inserted into the other ends of each heat transfer tube 21 arranged as the first and second rows. The cross-row manifold 24 distributes the refrigerant flowing from the heat transfer tubes 21 arranged as the first row to the heat transfer tubes 21 arranged as the second row. In addition, the cross-row manifold 24 distributes the refrigerant flowing from the heat transfer tubes 21 arranged as the second row to the heat transfer tubes 21 arranged as the first row and facing each other in the width direction.

[0055] Figure 3 This is a side view showing the cross-column manifold 24 of embodiment 1. Figure 3 This is a diagram showing the cross-column header 24 viewed from the length direction. Figure 4 This is a perspective view of the cross-row manifold 24 in embodiment 1. Figure 5 This is a perspective view showing the cross-row manifold 24 of Embodiment 1. Additionally, in Figure 5 For illustrative purposes, cover plate 34 is used. (For example...) Figures 3-5 As shown, the cross-row manifold 24 has a base 31, a corrugated plate 32, a cover plate 34, and an end plate 33.

[0056] (Base 31)

[0057] Figure 6 This is a perspective view of the base 31 in embodiment 1. Figure 7 This is a perspective view showing the base 31 of embodiment 1. Figure 6 as well as Figure 7As shown, the base 31 is a flat plate-shaped component for inserting the heat transfer tube 21. The base 31 is composed of a bottom base 41 and a side base 42. The bottom base 41 is the bottom surface of the base 31 and is a plate-shaped component with a plurality of insertion holes 51 and plate holes 52. The insertion holes 51 are openings for inserting the various ends of the heat transfer tube 21. In this embodiment 1, two insertion holes 51 are arranged in a group along the width direction. In addition, the insertion holes 51 are arranged in two rows along the length direction. The plate holes 52 are openings for inserting the end plate 33. The plate holes 52 are open over approximately the entire width of the bottom base 41 in the width direction. The side base 42 is a plate-shaped component that forms the side surface of the base 31 and extends along the edge extending from the edge portion of the bottom base 41 toward the length direction of the corrugated plate 32. Two side bases 42 are provided along the length direction of the heat exchanger 7. The side base 42 has multiple claws 61 and multiple protruding locking parts 62.

[0058] Figure 8 This is a structural diagram showing the cross-column manifold 24 of embodiment 1. Figure 9 This is a perspective view of the cross-row manifold 24 in embodiment 1. Figure 8 Shown in cross-column header 24 Figure 3 The cross-section shown is along the AA direction. That is, Figure 8 A cross-section along the length of the cross-row manifold 24 is shown. Additionally, in Figure 9 In the middle, it is shown through the cover plate 34 and partially through the corrugated plate 32. For example... Figure 4 as well as Figure 5 As shown, the claw portion 61 is a claw-shaped component protruding from the upper end of the side base 42 toward the cover plate 34. The claw portion 61 contacts the surface of the cover plate 34 opposite to the corrugated plate 32, pressing the cover plate 34 toward the corrugated plate 32. Figure 8 as well as Figure 9 As shown, the protruding locking portion 62 is a generally cylindrical component that protrudes from the inner wall surface of the side base 42. The upper end of the crest portion 71 of each corrugated plate 32 described later is locked in the protruding locking portion 62 in the width direction. Alternatively, the side base 42 may not have the protruding locking portion 62.

[0059] (Wave plate 32)

[0060] like Figure 5 as well as Figure 8As shown, the corrugated plate 32 is a corrugated plate formed by continuous crests 71 and troughs 72. The crests 71 are arched components at the top of the corrugated plate 32. The troughs 72 are arched components at the bottom of the corrugated plate 32. The crests 71 are respectively configured to cover a set of insertion holes 51 arranged along the width direction of the heat transfer tube assembly 20. That is, for each heat transfer tube 21 arranged along the width direction of the heat transfer tube assembly 20, the crests 71 form a manifold flow path 74 for refrigerant flow between themselves and the base 31. In addition, the uppermost part of the crests 71 is in contact with the cover plate 34. The lowermost part of the troughs 72 is in contact with the base 31 on both sides of the insertion holes 51 along the length direction of the cross-row manifolds 24. In addition, the planar portion of the corrugated plate 32, that is, the portion of the crests 71 and the troughs 72 except for the portion near the apex which is formed into a rounded shape, is called the planar portion 75. The corrugated plate 32 has multiple planar portions 75 divided by rounded corners near the apex of the crest portion 71 and the trough portion 72.

[0061] (End plate 33)

[0062] End plate 33 is a flat plate component disposed on the side of corrugated plate 32. End plate 33 is fixed to base 31 by being inserted into plate holes 52 formed in base 31. End plate 33 supports the side of cover plate 34. Engaging protrusion 81 is formed on end plate 33. Engaging protrusion 81 is a portion that protrudes upward from the upper end face of end plate 33. Engaging protrusion 81 engages with engagement holes 93 of cover plate 34, which will be described later. Alternatively, end plate 33 may not have engaging protrusion 81.

[0063] (Cover plate 34)

[0064] Cover plate 34 is a flat plate that covers corrugated plate 32. Cover plate 34 is located on the upper part of cross-row manifold 24, between two side bases 42. Cover plate 34 presses corrugated plate 32 towards base 31. Furthermore, a cover space 94 is formed between cover plate 34 and corrugated plate 32. Engaging holes 93 are formed on the side of cover plate 34. Engaging holes 93 are openings for inserting engaging protrusions 81 of end plate 33.

[0065] (Second lower manifold 25)

[0066] The second lower manifold 25 is arranged parallel to the first lower manifold 23 and has one end inserted into it, forming a second row of heat transfer tubes 21. A refrigerant pipe 4 is connected to the second lower manifold 25. The second lower manifold 25 distributes the refrigerant flowing from the refrigerant pipe 4 to the heat transfer tubes 21 arranged in the second row. Additionally, the second lower manifold 25 allows the refrigerant flowing from the heat transfer tubes 21 arranged in the second row to flow out through the refrigerant pipe 4. Alternatively, the heat exchanger 7 can be configured such that the first lower manifold 23 and the second lower manifold 25 are integrally formed, with a dividing section (not shown) in the center to divide the internal space.

[0067] Here, the manufacturing method of the heat exchanger 7 will be described. Furthermore, the base 31, fins 22, first lower manifold 23, and second lower manifold 25 of the cross-row manifold 24 are composed of a cladding formed by pressure welding of brazing metal. First, each part of the heat exchanger 7 is formed into a predetermined shape. Here, for example, after the corrugated plate 32 is cut into a rectangular flat plate of a predetermined size, it is processed into a corrugated shape. Additionally, after the base 31 has the insertion hole 51 and the engaging protrusion 81 formed, it is bent to form a bottom base 41 and a side base 42.

[0068] Next, the various parts of the heat exchanger 7 are assembled. Specifically, first, the corrugated plate 32 is inserted into the base 31 of the cross-row manifold 24. Thus, the crests 71 are respectively configured to cover a set of insertion holes 51 arranged along the width direction, and the troughs 72 respectively contact the base 31 on both sides of the insertion holes 51 along the length direction of the base 31. Next, the end plate 33 is inserted into the plate holes 52 of the base 31. Then, the cover plate 34 is installed on the base 31 to cover the corrugated plate 32. At this time, the engaging protrusions 81 of the end plate 33 are inserted into the engaging holes 93 of the cover plate 34. Then, the cross-row manifold 24 is assembled by bending the claws 61 of the side base 42.

[0069] Furthermore, fins 22 are respectively provided between the multiple heat transfer tubes 21, and the heat transfer tubes 21 are inserted into the cross-row manifold 124, the first lower manifold 23, and the second lower manifold 25. Thus, the heat exchanger 107 is assembled as a whole. Then, the assembled heat exchanger 107 is placed in a brazing apparatus for brazing. The brazing temperature can be set to an upper limit temperature that is higher than the solidus temperature of the Al-Si alloy typically used as solder, but at which the Al base material does not melt, for example, exceeding 580°C but less than 630°C. Through brazing, the pressure-welded cladding melts, fixing the various parts of the heat exchanger 7 in place. In this way, the heat exchanger 7 is manufactured.

[0070] Furthermore, the order of each step in the above manufacturing method can be appropriately changed. For example, only the cross-row manifold 24 can be brazed and fixed first. Also, although the example given is the base 31 of the cross-row manifold 24 as the covering, it is possible to use not only the base 31, but also the end plate 33 and the cover plate 34 as coverings. Furthermore, only the corrugated plate 32 can be used as a covering. That said, not only the cross-row manifold 24, but also the entire heat exchanger 7 can be appropriately adjusted in which component is used as a covering.

[0071] According to Embodiment 1, the cross-row manifold 24 includes a cover plate 34 that presses the corrugated plate 32 toward the base 31. Therefore, the corrugated plate 32 can suppress deformation caused by the pressure of the refrigerant flowing in the cross-row manifold 24. That is, the corrugated plate 32 does not need to be thick-walled to suppress deformation caused by the pressure of the refrigerant flowing in the cross-row manifold 24. Therefore, the heat exchanger 7 can adjust the number and spacing of the heat transfer tubes 21 inserted into the cross-row manifold 24, increasing design flexibility.

[0072] Furthermore, the cover plate 34 presses against each crest 71 of the corrugated plate 32. Therefore, even if there are tolerances in the height of each crest 71 during the manufacturing of the corrugated plate 32, the height of each crest 71 remains consistent. That is, the strength of the corrugated plate 32 against the refrigerant flowing in the manifold flow path 74 is constant at any point, resulting in fewer parts prone to damage. Therefore, the heat exchanger 7 is less likely to be damaged by the pressure of the refrigerant flowing in the cross-row manifold 24.

[0073] Furthermore, according to Embodiment 1, the side base 42 has claw portions 61. The claw portions 61 contact the surface of the cover plate 34 opposite to the corrugated plate 32, pressing the cover plate 34 towards the corrugated plate 32. Therefore, the corrugated plate 32 is pressed more strongly against the cover plate 34, thus further suppressing deformation caused by the pressure of the refrigerant flowing in the cross-row manifold 24. That is, the corrugated plate 32 does not need to be thick-walled. Therefore, the heat exchanger 7 can adjust the number and spacing of the heat transfer tubes 21 inserted into the cross-row manifold 24, increasing design flexibility.

[0074] Furthermore, according to Embodiment 1, the side base 42 has a protruding locking portion 62. Generally, when the corrugated plate becomes longer, the tolerance generated in the length direction of the corrugated plate may cause the crest of the corrugated plate to be located in a position that does not cover the insertion hole. Here, the side base 42 of Embodiment 1 is provided with a protruding locking portion 62. Therefore, by locking the end of the crest portion 71 in the width direction with the protruding locking portion 62, the cross-row manifold 24 can accurately determine and fix the position of the corrugated plate 32. Therefore, the heat exchanger 7 of Embodiment 1, which is provided with multiple heat transfer tubes 21, can also cope with the large-scale corrugated plate 32 that requires a long one.

[0075] Figure 10 This is a perspective view of the cross-row manifold 24, representing a modified example of embodiment 1. (See diagram below.) Figure 10 As shown, the cross-row manifold 24 has legs 35. The legs 35 are plate-shaped components that extend along the vertical direction of the heat exchanger 7 and support the heat exchanger 7.

[0076] Figure 11 This is a structural diagram of the cross-row manifold 24, which represents a modified example of embodiment 1. Figure 11 and Figure 8Similarly, a cross-section along the length of the cross-row manifold 24 is shown. For example... Figure 11 As shown, the cross-row manifold 24 has a partition plate 36. The partition plate 36 is a flat plate component provided on the cross-row manifold 24 in a manner that breaks the cross-row manifold 24 along its length. Furthermore, two or more partition plates 36 may be provided. The partition plate 36 interrupts the flow of refrigerant in the space on both sides of the partition plate 36. In addition, the partition plate 36 is formed to a thickness that will not deform even when there is a large pressure difference of refrigerant on both sides of the partition plate 36. Therefore, the heat exchanger 7 will not deform the corrugated plate 32, and refrigerant at different pressures can flow on both sides separated by the partition plate 36, as in the case where multiple refrigerant pipes 4 forming different refrigerant circuits are connected.

[0077] Implementation method 2.

[0078] Figure 12 This is a perspective view showing the cross-column manifold 124 of Embodiment 2. Furthermore, in Figure 12 In the middle, for illustrative purposes, the cover plate 134 is used for reference. For example... Figure 12 As shown, the difference between this embodiment 2 and embodiment 1 is that a corrugated plate hole 173 is formed in the corrugated plate 132. In this embodiment 2, the same reference numerals are used for the parts that are the same as in embodiment 1, and the description is omitted. The description focuses on the differences from embodiment 1.

[0079] (Spanning manifold 124)

[0080] Figure 13 This is a perspective view showing the cross-row manifold 124 of embodiment 2. Figure 14 This is a perspective view showing the cross-row manifold 124 of embodiment 2. (See diagram below.) Figures 12-14 As shown, the cross-row manifold 124 has a base 131, a corrugated plate 132, and a cover plate 134. Additionally, the cross-row manifold 124 does not have end plates. Alternatively, the cross-row manifold 124 may have end plates 33.

[0081] (Wave plate 132)

[0082] Figure 15 This is a structural diagram showing the cross-column manifold 124 of embodiment 2. Figure 15 and Figure 8 as well as Figure 11 Similarly, a cross-section along the length of the cross-row manifold 124 is shown. For example... Figure 12 as well as Figure 15As shown, corrugated plate holes 173 are formed on the flat portion 75 of the corrugated plate 132. The corrugated plate holes 173 are openings for refrigerant to flow through the manifold flow path 74 and the cover space 94. Thus, the cover space 94 is filled with refrigerant flowing from the manifold flow path 74 through the corrugated plate holes 173. Furthermore, the manifold flow path 74 is filled with refrigerant flowing between the opposing heat transfer tubes 21 in the width direction. That is, the corrugated plate holes 173 ensure uniform refrigerant pressure in the manifold flow path 74 and the cover space 94. In addition, the size of the corrugated plate holes 173 is set to a range that will not be blocked by molten metal when the heat exchanger 107 is brazed and fixed.

[0083] (Cover plate 134)

[0084] The cover plate 134 is composed of an upper cover plate 191 and a side cover plate 192. The upper cover plate 191 is a plate that covers the top of the corrugated plate 132. The upper cover plate 191 presses the corrugated plate 132 toward the base 131. The side cover plate 192 is a plate that covers the sides of the corrugated plate 132. The side cover plate 192 is fixed to the base 131 by being inserted into a plate hole 52 formed in the base 131. That is, the side cover plate 192 has the same function as the end plate 33 in Embodiment 1. Furthermore, when the cross-row manifold 124 has an end plate 33, the cover plate 134 may also be composed of only the upper cover plate 191.

[0085] Figure 16 This is a perspective view of the cover plate 134 in embodiment 2. Figure 17 This is a perspective view showing the cross-row manifold 124 of embodiment 2. (See diagram below.) Figure 16 as well as Figure 17 As shown, the cover plate 134 can also be shaped to extend towards the end in the length direction. In this case, the heat exchanger 107 can fix the base 131 and the cover plate 134 regardless of the thickness of the cover plate 134.

[0086] According to Embodiment 2, a corrugated plate hole 173 is formed in the corrugated plate 132. As a result, the cover space 94 is filled with refrigerant flowing from the manifold flow path 74 through the corrugated plate hole 173. Furthermore, the manifold flow path 74 is filled with refrigerant flowing between the heat transfer tubes 21 facing each other in the width direction. That is, the refrigerant pressure is uniform in the manifold flow path 74 and the cover space 94. Therefore, the corrugated plate 132 further suppresses deformation caused by the pressure of the refrigerant flowing in the manifold flow path 74 without the need for thick walls. Therefore, the heat exchanger 107 can adjust the number and spacing of the heat transfer tubes 21 inserted into the cross-row manifold 124, increasing design flexibility.

[0087] Implementation method 3.

[0088] Figure 18 This is a perspective view showing the wave plate 232 in embodiment 3. Figure 18As shown, the difference between this embodiment 3 and embodiment 1 is that the corrugated plate hole 273 is formed at the end of the corrugated plate 232 in the width direction. In this embodiment 3, the same reference numerals are used for the parts that are the same as in embodiment 1, and the description is omitted. The description focuses on the differences from embodiment 1.

[0089] (Wave plate 232)

[0090] The corrugated plate holes 273 are formed in a semi-circular shape at both ends of the corrugated plate 232 in the width direction. Therefore, for example, a portion of the refrigerant flowing in the manifold flow path 74 flows out from one corrugated plate hole 273 into the cover space 94, and a portion of the refrigerant flowing in the cover space 94 flows out from the other corrugated plate hole 273 into the manifold flow path 74. That is, the refrigerant circulates in the manifold flow path 74 and the cover space 94. Therefore, the refrigerant pressure is more uniform in the manifold flow path 74 and the cover space 94.

[0091] Figure 19 This is a diagram illustrating the manufacturing method of the heat exchanger 207 in Embodiment 3. Figure 19 This is a diagram showing the cross-column header 224 viewed from the length direction. Additionally, in... Figure 19 For simplicity, only the bottom base 41, side base 42, and corrugated plate 232 are shown. The base 31 is a covering, and solder is welded to the inner surface of the side base 42, i.e., the surface in contact with the corrugated plate 232. In embodiment 3, as... Figure 19 As shown, the cross-row manifold 224 is brazed by positioning the side base 42 above and below the corrugated plate 232.

[0092] Furthermore, the corrugated plate hole 271 before brazing is referred to as the pre-heating hole. That is, the corrugated plate hole 271 is the hole after the pre-heating hole is deformed due to the brazing of the cross-row manifold 224. Hereinafter, the preferred dimensions of the pre-heating hole used in this embodiment 3 will be described. The pre-heating hole is processed simultaneously, for example, when the length in the width direction of the corrugated plate 232 is consistent. One pre-heating hole is formed on the upper and one on the lower of the corrugated plate 232, and both are semi-circular in shape. When it is necessary to distinguish between the upper and lower pre-heating holes, they are described using the following reference numerals, that is, the lower side is designated as the pre-heating hole 280d, and the upper side is designated as the pre-heating hole 280u. The width of the lower pre-heating hole 280d, that is, the width of the portion of the corrugated plate 232 that does not contact the lower side base 42, is designated as Wd. Since the pre-heating hole 280d is semi-circular, the distance from the lower side base 42 to the outer edge of the lower pre-heating hole 280d is maximized at the central portion Cd of the outer edge, which is Wd / 2. Similarly, the width of the upper heating front hole 280u, that is, the width of the part where the wave plate 232 does not contact the upper side base 42, is set as Wu. Since the heating front hole 280u is semi-circular, the distance from the upper side base 42 to the outer edge of the upper heating front hole 280u is the largest Wu / 2 at the central part of the outer edge, Cu.

[0093] Here, we will explain whether or not the pre-heating hole becomes blocked during brazing. Typically, during brazing, molten solder flows into and fills the pre-heating hole, thus causing blockage. Figure 20 This is a diagram showing whether the lower heating pre-hole 280d is blocked in the brazing process of Embodiment 3, based on the width Wd and peak temperature of each pre-heating hole. Figure 21 Similarly, this diagram shows whether the upper heating pre-hole 280u is blocked during brazing in Embodiment 3, taking into account the width Wu and peak temperature of each pre-heating hole. Figure 19 As shown, Figure 20 as well as Figure 21 The presence or absence of blockage of the heating holes was verified when the side base 42, which serves as the covering, was located above and below the corrugated plate 232 and brazing was performed, with regard to the width and peak temperature of each heating hole, and the results were plotted. Figure 20 This indicates the condition of the lower heating port 280d. Figure 21 This indicates the case of the upper heating port 280u.

[0094] like Figure 20 as well as Figure 21As shown, it can be seen that as the peak temperature of brazing increases, the heating front hole with a larger width W also becomes clogged. Furthermore, it can be seen that the width of the clogged opening differs between the upper and lower heating front holes. Specifically, when heating at the same peak temperature, the lower heating front hole 280d becomes clogged with a larger width Wd. This difference is caused by the fact that when the molten cladding flows along the corrugated plate 232 under gravity, it flows into the lower heating front hole 280d, which is located at a lower position than the upper heating front hole 280u.

[0095] Figure 22 This is a side view showing the brazed corrugated plate 232 of embodiment 3. Figure 22 This is a diagram showing the corrugated plate 232 viewed along its length. The dashed line represents the pre-heating hole. (Example:) Figure 22 As shown, even if heating holes of the same width are opened at both ends of the corrugated plate 232 in the width direction before brazing, the size of the corrugated plate hole 273 after brazing will differ depending on the orientation of the cross-row manifold 224 during brazing. In other words, for the heating hole 280u located on the upper side during brazing, even if the width Wu is formed to be smaller than the width of the heating hole 280d located on the lower side, blockage is unlikely. Specifically, as... Figure 20 as well as Figure 21 As shown, in the upper heating front hole 280u, compared to the lower heating front hole 280d which is brazed at the same peak temperature, there is room to reduce the width Wu by 1 mm before blockage occurs. Therefore, for example, the upper heating front hole 280u only needs to reduce the width Wu by 1 mm compared to the lower heating front hole 280d.

[0096] In addition, such as Figure 21 As shown, even the lower heating front hole 280d, which is prone to clogging, can be prevented from clogging as long as its width is ensured to be 1 mm. Furthermore, the heating front hole is formed on the flat portion 75 with a rounded shape that does not extend to the corrugated plate 232. Therefore, the heating front hole can be such that the width dimension of the flat portion 75 of the corrugated plate 232 is set to L and falls within the range of 1 mm to L minus the machining tolerance in mm. The machining tolerance is, for example, 0.5 mm.

[0097] According to Embodiment 3, the corrugated plate holes 273 are formed at both ends of the corrugated plate 232 in the width direction. Therefore, for example, a portion of the refrigerant flowing in the manifold flow path 74 flows out from one corrugated plate hole 273 into the cover space 94, and a portion of the refrigerant flowing in the cover space 94 flows out from the other corrugated plate hole 273 into the manifold flow path 74. That is, the refrigerant circulates in the manifold flow path 74 and the cover space 94, resulting in more uniform refrigerant pressure. Consequently, the corrugated plate 232 further suppresses deformation caused by the pressure of the refrigerant flowing in the manifold flow path 74, and the corrugated plate 232 does not need to be thick-walled. Therefore, the heat exchanger 207 can adjust the number and spacing of the heat transfer tubes 21 inserted into the cross-row manifold 224, increasing design flexibility.

[0098] Alternatively, the corrugated plate holes 273 can be machined simultaneously with the length of the corrugated plate 232 in the width direction. In this case, the heat exchanger 207 can reduce machining time.

[0099] According to the manufacturing method of the heat exchanger 207 in Embodiment 3, the width Wu of the upper heating front hole 280u during brazing is made smaller than the width Wd of the lower heating front hole 280d. Therefore, it is possible to suppress the clogging of the heating front hole after brazing and ensure the joint area between the corrugated plate 232 and the side base 42, thereby suppressing the reduction of the joint strength between the corrugated plate 232 and the base 31.

[0100] Furthermore, according to the manufacturing method of the heat exchanger 207 in Embodiment 3, the pre-heating hole is formed within the range of 1 mm to L - machining tolerance mm. Therefore, it is possible to suppress the clogging of the pre-heating hole after brazing and ensure the joint area between the corrugated plate 232 and the side base 42, thereby suppressing the reduction of the joint strength between the corrugated plate 232 and the base 31.

[0101] Implementation method 4.

[0102] Figure 23 This is a diagram illustrating the manufacturing method of the heat exchanger 307 in Embodiment 4. Figure 23 This is a diagram showing the cross-column header 324 viewed from the length direction. (See diagram below.) Figure 23 As shown, the manufacturing method of the heat exchanger 307 in Embodiment 4 differs from that in Embodiment 3 in that a rectangular heating front hole 380 is formed in the corrugated plate 332. In this Embodiment 4, the same reference numerals are used for the parts that are the same as in Embodiment 3, and the description is omitted. The description focuses on the differences from Embodiment 3.

[0103] like Figure 23 As shown, in Embodiment 4, the heating pre-hole 380 is set in a rectangular shape. Furthermore, in Figure 23In the embodiment 4, the cross-row manifolds 324 are arranged vertically with the side base 42 separated from the corrugated plate 332. However, in the manufacturing method of the heat exchanger 307 in embodiment 4, the orientation of the cross-row manifolds 324 is not limited during brazing. Generally, in brazing, the molten solder fills the heating front hole 380 by starting at the junction between the outer edge of the heating front hole 380 and the side base 42, forming a weld bead along the outer edge of the heating front hole 380. Typically, when molten metal flows between different components, the smaller the gap between them due to capillary force, the easier it is for the molten metal to fill. Similarly, the narrower the distance between the outer edge of the heating front hole 380 and the side base 42, the easier it is for solder to fill the heating front hole 380 and cause blockage.

[0104] For example, such as Figure 23 As shown by the dashed line, when the heating hole is semi-circular, the distance between the outer edge of the heating hole 380 and the side base 42 is greatest only at the central portion C of the outer edge of the heating hole 380. Conversely, as in Embodiment 4, when the heating hole 380 is rectangular, the distance between the outer edge of the heating hole 380 and the side base 42 is greatest at the edge F of the outer edge of the heating hole 380 opposite the inner surface of the side base 42. Therefore, when the width of the heating hole 380 and the maximum distance between the heating hole 380 and the side base 42 are set to be the same, the rectangular heating hole 380, compared to the semi-circular shape, can generally increase the distance between the heating hole 380 and the side base 42.

[0105] In addition, the width W of the rectangular heating front hole 380 is the same as the diameter of the semi-circular heating front hole 380 in Embodiment 3, so that the size of the flat portion 75 of the corrugated plate 332 can be set to L and is within the range of 1mm to L-machining tolerance mm, for example, 0.5mm.

[0106] According to the manufacturing method of the heat exchanger 307 in Embodiment 4, by forming the heating front hole 380 into a rectangular shape, the overall distance between the heating front hole 380 and the side base 42 is increased. Therefore, it is possible to suppress the clogging of the heating front hole 380 after brazing, ensure the joint area between the corrugated plate 232 and the side base 42, and thereby suppress the reduction of the joint strength between the corrugated plate 232 and the base 31.

[0107] Implementation method 5.

[0108] Figure 24 This is a perspective view of the cross-row manifold 424 in embodiment 5. Figure 25 This is a perspective view showing the cross-row manifold 424 of embodiment 5. Additionally, in Figure 25 It is shown through the cover plate 434 and partially through the corrugated plate 32. Furthermore, Figure 26This is a perspective view showing the base 431 of embodiment 5. (Example) Figures 24-26 As shown, the difference between this embodiment 5 and embodiment 1 is that a notch 463 is formed in the base 431. In this embodiment 5, the same reference numerals are used for the parts that are the same as in embodiment 1, and the description is omitted. The description focuses on the differences from embodiment 1.

[0109] In embodiment 5, the heat exchanger 407 is installed on the outdoor unit 2, for example, with its bottom base 441 serving as the lower side of the base 431. Figures 24-26 As shown, the side base 442 of this embodiment 5 has a semi-circular notch 463 on both sides of each claw portion 61. The depth of the notch 463 is adjusted such that the lower end of the notch 463 is lower than the upper surface of the cover plate 434.

[0110] Generally, during brazing, when the upper surface of the cover plate 434 is positioned lower than the upper end face of the side base 442, rainwater falling onto the upper surface of the cover plate 434 is blocked by the side base 442 and does not drain, sometimes accumulating unnecessarily. In this case, the water trapped on the upper surface of the cover plate 434 may cause corrosion of the cross-row manifold 424. In contrast, in this embodiment 5, the trapped water is drained by the notch 463, thereby suppressing corrosion of the cross-row manifold 424.

[0111] Furthermore, when prioritizing drainage and the side bases 442 are installed along their entire length at a position lower than the upper surface of the cover plate 434, the contact surface between the base 431 and the cover plate 434 cannot be adequately ensured, potentially leading to poor brazing. In this case, the pressure resistance of the cross-row manifold 424 may be reduced. In contrast, in this embodiment 5, by providing notches 463 only on both sides of the claw portion 61, both the pressure resistance and drainage performance of the cross-row manifold 424 can be balanced.

[0112] Furthermore, since the multiple claws 61 of the side base 442 press the cover plate 434 toward the wave plate 32, the root of the claws 61 is bent. At this time, the bending processability of the claws 61 is improved by the presence of notches 463 on both sides of the claws 61.

[0113] Furthermore, a plurality of plate locking portions 453 are formed on the side base 442. Two plate locking portions 453 protrude from the inner wall surface at each of the two ends of the side base 442 in the longitudinal direction. In addition, the bottom base 441 does not have a plate hole for inserting the end plate 433. In this embodiment 5, one end of the end plate 433 is fixed in such a way that it is clamped between two plate locking portions 453. In this case, the cross-row manifold 424 can also fix the end plate 433 while ensuring the same pressure resistance as when the end plate 433 is inserted into the plate hole 52 of embodiment 1.

[0114] The embodiments described above and their variations can be appropriately combined without departing from the spirit of the invention. For example, the plate retaining part 453 of embodiment 5 can be replaced or additionally provided on the base 31 of embodiment 1. In addition, the notch 463 of embodiment 5 can be formed in the base of embodiments 2 to 4.

[0115] Explanation of reference numerals in the attached figures

[0116] 1...Air conditioner; 2...Outdoor unit; 3...Indoor unit; 4...Refrigerant piping; 5...Compressor; 6...Flow path switching device; 7...Heat exchanger; 8...Outdoor fan; 9...Expansion section; 11...Indoor heat exchanger; 12...Indoor fan; 20...Heat transfer tube assembly; 21...Heat transfer tube; 22...Fin; 23...First lower manifold; 24...Spanning manifold; 25...Second lower manifold; 31...Base; 32...Bell plate; 33...End plate; 34...Cover plate; 35...Leg; 36...Separator plate; 41...Bottom base; 42...Side base; 51...Insertion hole; 52...Plate hole; 61...Claw; 62...Protruding locking part; 71...Crest; 72...Cut-out; 74...Manifold flow path; 75... Flat section; 81... Engaging protrusion; 93... Engaging hole; 94... Cover space; 107... Heat exchanger; 124... Cross-row manifold; 131... Base; 132... Corrugated plate; 134... Cover plate; 173... Corrugated plate hole; 191... Upper cover plate; 192... Side cover plate; 207... Heat exchanger; 224... Cross-row manifold; 232... Corrugated plate; 273... Corrugated plate hole; 280d... Heating front hole; 280u... Heating front hole; 307... Heat exchanger; 324... Cross-row manifold; 332... Corrugated plate; 380... Heating front hole; 407... Heat exchanger; 424... Cross-row manifold; 431... Base; 441... Bottom base; 442... Side base; 433... End plate; 453... Plate locking part; 463... Notch.

Claims

1. A heat exchanger, characterized in that, have: A heat transfer tube assembly, which consists of multiple heat transfer tubes having internal flow paths for refrigerant flow, and the multiple heat transfer tubes arranged along the width direction are arranged in multiple columns along the length direction. Fins, which are disposed on the heat transfer tube, facilitate heat exchange between the refrigerant flowing inside the heat transfer tube and the air. as well as A cross-row manifold, into which the ends of the heat transfer tubes are inserted, allows refrigerant to flow between the heat transfer tubes arranged along the width of the heat transfer tube assembly. The cross-column header has: A flat base having insertion holes for inserting the various ends of the heat transfer tubes; A corrugated plate, which is formed as a continuous corrugated plate with corrugations and troughs, is configured such that the corrugations cover a set of insertion holes arranged along the width direction, and the troughs contact the base on both sides of the insertion holes along the length direction of the base. A manifold flow path for refrigerant flow is formed between the corrugated plate and the base for each heat transfer tube arranged along the width direction of the heat transfer tube assembly; and A cover plate that covers the corrugated plate and presses the corrugated plate toward the base side.

2. The heat exchanger according to claim 1, characterized in that, Each of the wave crests of the wave plate has a wave plate hole, which allows refrigerant to flow through the manifold flow path and the cover space between the wave plate and the cover plate.

3. The heat exchanger according to claim 2, characterized in that, The corrugated plate holes are formed at both ends of the corrugated plate in the width direction.

4. The heat exchanger according to claim 2 or 3, characterized in that, The corrugated plate holes are formed after the pre-heating holes of the corrugated plate are deformed by the brazing of the cross-row manifold. The preheating hole is formed in a semi-circular shape with a width of 1 mm or more and less than the difference between the length of the planar portion of the corrugated plate and the machining tolerance.

5. The heat exchanger according to claim 4, characterized in that, The heating holes are formed on both sides of the wave plate in the width direction, each with a different width.

6. The heat exchanger according to claim 2 or 3, characterized in that, The corrugated plate holes are formed after the pre-heating holes of the corrugated plate are deformed by the brazing of the cross-row manifold. The heating hole is rectangular in shape.

7. The heat exchanger according to any one of claims 1 to 3 and 5, characterized in that, The base has: Bottom base for inserting the heat transfer tube; and A side base that extends from the edge portion of the bottom base in such a manner as to the edge extending along the length direction of the corrugated plate.

8. The heat exchanger according to claim 7, characterized in that, The side base has a claw portion that contacts the surface of the cover plate opposite to the corrugated plate, pressing the cover plate toward the corrugated plate side.

9. The heat exchanger according to claim 8, characterized in that, The side base has notches on both sides of the claw.

10. The heat exchanger according to claim 9, characterized in that, The lower end of the notch is located below the upper surface of the cover plate.

11. The heat exchanger according to claim 7, characterized in that, The side base has multiple protruding locking portions that protrude from the inner wall surface and are used to lock the ends of each of the crest portions in the width direction.

12. A method for manufacturing a heat exchanger, characterized in that, It includes a process of assembling heat transfer tube assemblies, fins, and cross-row manifolds, and a process of brazing the heat transfer tube assemblies, fins, and cross-row manifolds. The heat transfer tube assembly consists of multiple heat transfer tubes with internal flow paths for refrigerant flow, and the multiple heat transfer tubes arranged along the width direction are arranged in multiple columns along the length direction. The fins are disposed on the heat transfer tube to facilitate heat exchange between the refrigerant flowing inside the heat transfer tube and the air. The cross-row manifold allows the ends of the heat transfer tubes to be inserted, enabling refrigerant to flow between the heat transfer tubes arranged along the width of the heat transfer tube assembly. The assembly process includes the following steps: In a base of a cross-row manifold having insertion holes for inserting at each end of the heat transfer tubes, a corrugated plate formed as a continuous wave of crests and troughs is used to cover a set of insertion holes arranged along the width direction, and the troughs of the corrugated plate contact the base on both sides of the insertion holes along the length direction of the base, wherein the corrugated plate is inserted into the cross-row manifold in a manner that the crests of the corrugated plate cover a set of insertion holes arranged along the width direction, and the troughs of the corrugated plate contact the base on both sides of the insertion holes along the length direction of the base; and The process of installing the cover plate in a manner that covers the corrugated plate.

13. The method for manufacturing a heat exchanger according to claim 12, characterized in that, The upper limit temperature for brazing in the brazing process is above 580°C and below 630°C.

14. The method for manufacturing a heat exchanger according to claim 12 or 13, characterized in that, Prior to the brazing process, a process is also performed to form a pre-heating hole in the corrugated plate. The pre-heating hole is a semi-circular shape with a width of 1 mm or more and less than the difference between the length of the planar portion of the corrugated plate and the machining tolerance.

15. The method for manufacturing a heat exchanger according to claim 14, characterized in that, In the process of forming the pre-heating holes, the pre-heating holes are formed at both ends of the corrugated plate in the width direction. In the brazing process, the cross-row manifolds are arranged with the side bases positioned vertically above and below the corrugated plates. In the process of forming the heating pre-hole on the wave plate, the heating pre-hole located on the upper side is formed with a width smaller than that of the heating pre-hole located on the lower side.

16. The method for manufacturing a heat exchanger according to claim 12 or 13, characterized in that, Prior to the brazing process, a process is also performed to form a pre-heating hole in the corrugated plate. The heating hole is rectangular in shape.

Images