Heat exchanger

Abstract

The heat exchanger comprises a flat pipe and a plurality of plates, the plates are stacked, the flat pipe is arranged between at least one set of adjacent plates, the flat pipe is provided with a plurality of through holes, a first inter-plate channel is arranged between at least another set of adjacent plates, the heat exchanger comprises a first flow channel and a second flow channel, and the first flow channel is communicated with the second flow channel. The first flow channel is not communicated with the second flow channel, fluid in the first flow channel can exchange heat with fluid in the second flow channel, and the flat pipes are combined with the sheet bars, so that the structure of the heat exchanger is simplified.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchanger. Background Art

[0002] The heat exchanger includes a shell and a core. The core includes a first header, a second header, a fin plate and a flat tube. A number of horizontally placed flat tubes are evenly arranged between the first header and the second header. Fins distributed in a vertical array are inserted between adjacent flat tubes. The flat tubes and the header are provided with refrigerant flow channels. The fin plate has a coolant flow channel. The core is placed in the accommodating cavity of the shell to realize heat energy exchange between the refrigerant and the refrigerant. The core must be assembled in the accommodating cavity of the shell, so the overall structure of the heat exchanger is complicated. Summary of the invention

[0003] The purpose of the present application is to provide a heat exchanger with a simple structure.

[0004] To achieve the above purpose, an implementation method of the present application adopts the following technical solution:

[0005] A heat exchanger includes a flat tube and a plurality of plates, wherein the plurality of plates are stacked, and along the stacking direction of the plates, the flat tube is arranged between at least one group of adjacent plates, and the flat tube has a plurality of through holes, and a first inter-plate channel is provided between at least another group of adjacent plates. The heat exchanger includes a first flow channel and a second flow channel, wherein the first flow channel and the second flow channel are not connected, and the fluid in the first flow channel can exchange heat with the fluid in the second flow channel, and the through holes of the flat tube are part of the first flow channel, and the first inter-plate channel is part of the second flow channel.

[0006] In one embodiment provided in the present application, a heat exchanger includes a flat tube and a plurality of plates, the plurality of plates are stacked, a flat tube is arranged between at least one group of adjacent plates, the flat tube has a plurality of through holes, and a first inter-plate channel is provided between at least another group of adjacent plates. The heat exchanger includes a first flow channel and a second flow channel, the first flow channel and the second flow channel are not connected, the fluid in the first flow channel can exchange heat with the fluid in the second flow channel, and the flat tube is combined with the plate. Such an arrangement is conducive to simplifying the structure of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a three-dimensional structural schematic diagram of a heat exchange unit A of the first embodiment of the heat exchanger provided by the present application from one perspective;

[0008] Figure 2 It is a schematic diagram of the exploded structure of the heat exchange unit A of the first embodiment of the heat exchanger provided by the present application;

[0009] Figure 3It is a structural schematic diagram of a heat exchange unit A of the first embodiment of the heat exchanger provided by the present application from one perspective;

[0010] Figure 4 yes Figure 3 A schematic cross-sectional view of the heat exchange unit A along AA;

[0011] Figure 5 yes Figure 3 A schematic cross-sectional view of the heat exchange unit A along line BB;

[0012] Figure 6 yes Figure 1 A schematic diagram of the three-dimensional structure of the third plate from one perspective;

[0013] Figure 7 yes Figure 1 A schematic diagram of the three-dimensional structure of the third plate from another perspective;

[0014] Figure 8 yes Figure 1 A schematic diagram of the three-dimensional structure of the second plate from one viewing angle;

[0015] Fig. 9 yes Figure 1 A schematic diagram of the three-dimensional structure of the second plate from another perspective;

[0016] Fig.10 A schematic diagram of a three-dimensional structure of a combined structure of a flat tube and a third plate from one perspective;

[0017] Fig.11 A schematic diagram of a three-dimensional structure of a combined structure of a flat tube and a third plate in another embodiment from one viewing angle;

[0018] Fig.12 A schematic diagram of a three-dimensional structure of a combined structure of a flat tube and a third plate in another embodiment from one viewing angle;

[0019] Fig.13 is a schematic diagram of the exploded structure of a heat exchange unit A of the second embodiment of the heat exchanger provided by the present application;

[0020] Fig.14 yes Fig.13 A schematic diagram of a three-dimensional structure of the first plate from one viewing angle;

[0021] Fig.15 yes Fig.13 A schematic diagram of the three-dimensional structure of the first plate from another perspective;

[0022] Fig.16 yes Fig.13 A schematic diagram of the three-dimensional structure of the second plate from one viewing angle;

[0023] Fig.17 yes Fig.13 A schematic diagram of the three-dimensional structure of the second plate from another perspective;

[0024] Fig.18 It is a three-dimensional structural schematic diagram of a combined structure of a fin plate and a second plate in a heat exchange unit A of a third embodiment of a heat exchanger provided by the present application from one perspective;

[0025] Fig.19 It is a three-dimensional structural schematic diagram of a combined structure of a flat tube and a third plate in a heat exchange unit A of a third embodiment of a heat exchanger provided by the present application from one perspective;

[0026] Fig. 20 is a structural schematic diagram from one perspective of a heat exchange unit A in a fourth embodiment of a heat exchanger provided in the present application;

[0027] Fig.21 yes Fig. 20 Schematic diagram of the cross-sectional structure of the middle heat exchange unit A along the CC plane;

[0028] Fig. 22 yes Fig. 20 Schematic diagram of the cross-sectional structure of the heat exchange unit A along the DD plane. DETAILED DESCRIPTION

[0029] The present application is further described below with reference to the accompanying drawings and specific embodiments:

[0030] Combination Figure 1-Figure 10 , which shows the partial structure of the first embodiment of the heat exchanger, wherein the heat exchanger comprises a plurality of plates 101, which are stacked and arranged, and there is a space for fluid circulation between adjacent plates 10. The heat exchanger comprises a flat tube 4, and along the stacking direction of the plates 101, a flat tube 4 is arranged between at least one group of adjacent plates 101, and the flat tube 4 has a plurality of through holes 41, and a first inter-plate channel S is provided between at least another group of adjacent plates 101. The heat exchanger comprises a first flow channel and a second flow channel, and the first flow channel and the second flow channel are not connected, and the fluid in the first flow channel can exchange heat with the fluid in the second flow channel, and the through holes 41 of the flat tube 4 are part of the first flow channel, and the first inter-plate channel S is part of the second flow channel. In this embodiment, a flat tube 4 is provided between a plate 101 and an adjacent plate 101, and a first inter-plate channel S is provided between a plate 101 and another adjacent plate 101. The first inter-plate channel S and the flat tube 4 are alternately arranged, the first inter-plate channel S is for the circulation of a first fluid, the through hole 41 is for the circulation of a second fluid, and the through hole 41 is not connected to the first inter-plate channel S. Combining the flat tube 4 and the plate 101 is conducive to simplifying the structure of the heat exchanger, and the flat tube 4 has a strong pressure bearing capacity, which is also conducive to improving the structural strength of the heat exchanger.

[0031] In this embodiment, the plate 101 includes a body 1015 and a flange 1011, the flange 1011 is arranged along the circumference of the body 1015, and the flange 1011 is upwardly protruding relative to the body 1015. A plurality of plates 101, a flat tube 4 and other components are assembled to form a core body, and the core body is put into a brazing furnace for brazing as a whole, and other components such as a top plate, a bottom plate, a mounting plate, etc., and the flanges 1011 of adjacent plates 101 are welded and sealed. In this embodiment, the upper and lower surfaces of the flat tube 4 are respectively welded to the adjacent plates 101, and the heat exchanger is sealed by welding. The heat exchanger of such a structure has high heat exchange efficiency, and does not need to set up an additional shell to accommodate the core body, and the structure of the heat exchanger is simple; in addition, the whole is brazed and fixed, and the forming process of the heat exchanger is also simple. The first fluid in this application refers to the coolant, which is mainly a coolant, such as cooling water or cooling oil. The second fluid in this application refers to the refrigerant, which is mainly a refrigerant, such as a fluorocarbon refrigerant and carbon dioxide.

[0032] In other embodiments, a flat tube 4 may be provided between the plate 101 and an adjacent plate, a flat tube 4 may be provided between the plate 101 and another adjacent plate 101, and a first inter-plate channel S may be provided between the lower plates 101, and a refrigerant may flow through the through hole 41 of the flat tube 4, that is, two layers of refrigerant inter-plate channels may be provided continuously, for example, a flat tube 4 may be provided between the first plate and the second plate, a flat tube 4 may be provided between the second plate and the third plate, and a first inter-plate channel may be provided between the third plate and the fourth plate, so that heat exchange may be performed between the coolant and the refrigerant, but the heat exchange efficiency between the coolant and the refrigerant is poor, and the heat exchange performance of the heat exchanger is relatively poor. Here, the first plate, the second plate, the third plate, and the fourth plate only represent four adjacent plates, and do not represent the order of the plates of the heat exchanger. In other embodiments, two or more layers of first inter-plate channels may be provided continuously, and then the flat tube 4 may be provided. In other embodiments, a flat tube 4 may be provided between one group of adjacent plates 101, and a first inter-plate channel S may be provided between other adjacent plates 101. For the convenience of description, the upper and lower directions are defined as the upper and lower directions in the drawings of the specification. Figure 1 The up and down directions of the heat exchanger are defined as the height direction, length direction and width direction of the heat exchanger as shown in the attached drawings of the specification. Figure 1 In the height direction, length direction and width direction of the heat exchanger, in this application, the height direction of the heat exchanger is consistent with the stacking direction of the plates; in this application, the length direction of the flat tube is basically consistent with the length direction of the heat exchanger, and basically consistent includes consistent and approximately consistent; in this application, the length direction of the plate is consistent with the length direction of the heat exchanger, and the width direction of the plate is consistent with the width direction of the heat exchanger; the front and rear directions are defined as the directions in the attached drawings of the specification. Figure 1 The front and rear directions, front and rear only indicate relative positions.

[0033] Combination Figure 6-Figure 10In this embodiment, along the length direction of the heat exchanger, the plate 101 includes a first end 1013 and a second end 1014, and the body 1015 of the plate 101 also includes a first corner hole area 6 and a second corner hole area 7, the first corner hole area 6 is close to the first end 1013, the second corner hole area 7 is close to the second end 1014, and the heat exchange area 1012 is located between the first corner hole area 6 and the second corner hole area 7. In this embodiment, the first corner hole area 6 is located between the heat exchange area 1012 and the flange 1011 close to the first end 1013, and the second corner hole area 7 is located between the heat exchange area 1012 and the flange 1011 close to the second end 1014. The first corner hole area 6 includes a first corner hole 61 and a second corner hole 62, and the second corner hole area 7 includes a third corner hole 71 and a fourth corner hole 72. Along the width direction of the heat exchanger, the first corner hole 61 and the third corner hole 71 are located on the same side of the plate 101, the second corner hole 62 and the fourth corner hole 72 are located on the other side of the plate 101, the first corner hole 61 and the fourth corner hole 72 are diagonally arranged, and the second corner hole 62 and the third corner hole 71 are diagonally arranged.

[0034] Combination Figure 1-Figure 2 The heat exchanger includes a first channel 104, a second channel 105, a third channel 106 and a fourth channel 107. The first corner holes 61 of the plurality of plates 101 are at least partially aligned along the stacking direction of the plates 101 to form the first channel 104. The second corner holes 62 of the plurality of plates 101 are at least partially aligned along the stacking direction of the plates 101 to form the second channel 105. The third corner holes 71 of the plurality of plates 101 are at least partially aligned along the stacking direction of the plates 101 to form the third channel 106. The fourth corner holes 72 of the plurality of plates 101 are at least partially aligned along the stacking direction of the plates 101 to form the fourth channel 107. Along the width direction of the heat exchanger, the first channel 104 and the third channel 106 are located on the same side of the heat exchanger, the second channel 105 and the fourth channel 107 are located on the other side of the heat exchanger, the first channel 104 and the fourth channel 107 are diagonally arranged, and the second channel 105 and the third channel 106 are diagonally arranged.

[0035] In this embodiment, the first channel 104 and the fourth channel 107 are respectively used for the refrigerant to flow into and out of the heat exchanger, and the second channel 105 and the third channel 106 are respectively used for the coolant to flow into and out of the heat exchanger. After the plate 101 is assembled with the flat tube 4, etc., it is brazed as a whole, and the corner hole areas of adjacent plates 101 are welded and connected. In this embodiment, the plate 101 and the adjacent plate 101 are spot welded at the periphery of their first corner holes 61, and along the direction perpendicular to the stacking direction of the plate 101, near the periphery of the first corner hole 61, there is a first channel 63 between the plate 101 and the adjacent plate 101; the plate 101 and another adjacent plate 101 are welded at the periphery of their first corner holes 61 in a full circle, and along the direction perpendicular to the stacking direction of the plate 101, near the periphery of the first corner hole 61, there is no first channel 63 connected to the first inter-plate channel S between the plate 101 and another adjacent plate 101. In this way, the first channel 104 can be connected to the through hole 41 through the first hole 63, and the first channel 104 is not connected to the first inter-plate channel S. Similarly, through this welding scheme, near the outer periphery of the fourth corner hole 72, the fourth channel 74 can be provided between the plate 101 and one of the adjacent plates 101, and the fourth channel 107 is connected to the through hole 41 through the fourth hole 74; near the outer periphery of the fourth corner hole 72, the plate 101 and another adjacent plate 101 are welded in a full circle, and the fourth channel 107 is not connected to the first inter-plate channel S; near the outer periphery of the second corner hole 62, the plate 101 and one of the adjacent plates 101 have the second hole 64 between them. 4. The plate 101 and another adjacent plate 101 are welded in a full circle, the second channel 105 is connected to the first inter-plate channel S through the second hole 64, and the second channel 105 is not connected to the through hole 41; near the outer periphery of the third corner hole 71, there is a third hole 73 between the plate 101 and one of the adjacent plates 101, the plate 101 and another adjacent plate 101 are welded in a full circle, the third channel 106 is connected to the first inter-plate channel S through the third hole 73, and the third channel 106 is not connected to the through hole 41.

[0036] In this embodiment, the first channel 104 is the inlet channel of the refrigerant, the fourth channel 107 is the outlet channel of the refrigerant, the second channel 105 is the inlet channel of the coolant, and the third channel 106 is the outlet channel of the coolant. The first channel 104 and the fourth channel 107 are arranged diagonally, and the second channel 105 and the third channel 106 are arranged diagonally, so that the flow paths of the refrigerant and the coolant can be increased and the heat exchange efficiency of the heat exchanger can be improved. The refrigerant flows into the first channel 104 from the inlet of the first channel 104, then flows into the through hole 41 of the flat tube 4 through the first channel 63, then flows into the fourth channel 107 through the fourth channel 74, and flows out of the heat exchanger from the fourth channel 107. The first channel 104, the fourth channel 107, the first channel 63, the through hole 41 of the flat tube 4 and the fourth channel 74 are all part of the first flow channel. The coolant flows into the second channel 105 from the inlet of the second channel 105, then flows into the first inter-plate channel S through the second hole 64, then flows into the third channel 106 through the third hole 73, and flows out of the heat exchanger from the third channel 106. The second channel 105, the third channel 106, the third hole 73, the first inter-plate channel S and the second hole 64 are part of the second flow channel. The inlet and outlet of the first channel 104, the second channel 105, the third channel 106 and the fourth channel 107 are located above or below the heat exchanger and can be flexibly selected as needed. In other embodiments, the first channel 104 can also be the inlet channel of the refrigerant, the third channel 106 can be the outlet channel of the refrigerant, the second flow channel can be the inlet channel of the coolant, and the fourth channel 107 can be the outlet channel of the coolant. The inlet or outlet channel of the refrigerant or coolant can be selected as needed.

[0037] Combination Figure 1 and Figure 2 In this embodiment, the plurality of plates 101 include plate 1, plate 2, and plate 3. Plate 1, plate 2, and plate 3 are stacked in sequence along the stacking direction of the plates 101, that is, plates 1, plate 2, and plate 3 are stacked from top to bottom, and plate 2 is located between plate 1 and plate 3. In this embodiment, the heat exchanger includes a heat exchange unit A, and the heat exchange unit A includes plates 1, plate 2, and plate 3. The heat exchange unit A is a local structure of the heat exchanger. In this embodiment, the structure of plate 1 and plate 3 is the same, so only two structures of plates 101 need to be manufactured, which is convenient for the molding of plate 101. The types of plates 101 are relatively few, and it is also convenient for the assembly of the heat exchanger. There is a first inter-plate channel S between plate 1 and plate 2, which can be used for the circulation of coolant. The flat tube 4 is located between plate 2 and plate 3, and the flat tube 4 includes a plurality of through holes 41, through holes 41 are used for the circulation of refrigerant, and through holes 41 are not connected to the first inter-plate channel S. The heat exchanger comprises a plurality of heat exchange units A without plates 1 .

[0038] Combination Figure 1-Figure 5In this embodiment, the flange 1011 and the body 1015 form a receiving chamber. In the present application, the plate 1 has a first receiving chamber 13, the plate 2 has a second receiving chamber 25, and the plate 3 has a third receiving chamber 36. In this embodiment, the flat tube 4 includes a flat tube 4, and the flat tube 4 is located in the third receiving chamber 36. In this embodiment, the flat tube 4 is located in the heat exchange area 1012. This arrangement is convenient for the assembly of the flat tube 4, and is also convenient for the subsequent introduction of the refrigerant into or out of the through hole 41 of the flat tube 4. The flat tube 4 includes a plurality of through holes 41, and the through holes 41 penetrate the flat tube 4 along the length direction of the flat tube 4. The through holes 41 form a refrigerant channel. The flat tube 4 has high structural strength and strong pressure bearing capacity. The flat tube 4 structure can improve the structural strength of the heat exchanger, especially when the refrigerant is carbon dioxide refrigerant, the working pressure of carbon dioxide is relatively large, and the flat tube 4 structure can withstand the working pressure of carbon dioxide. In other embodiments, part of the flat tube 4 can be located in the heat exchange area 1012, and part of the flat tube 4 can be located in the corner hole area.

[0039] In this embodiment, a plurality of through holes 41 are arranged in a row along the width direction of the heat exchanger, that is, a plurality of through holes 41 are roughly in the same straight line along the width direction of the heat exchanger, and such an arrangement is conducive to controlling the flow path of the refrigerant and improving the heat exchange performance. In other embodiments, a plurality of through holes 41 may also be arranged in a wave shape or randomly along the width direction of the heat exchanger, which may also realize the circulation of the refrigerant and achieve heat exchange. In this embodiment, the upper plate surface of the flat tube 4 is contacted and welded with the plate 2, and the lower plate surface of the flat tube 4 is contacted and welded with the plate 3, which may prevent the refrigerant from flowing into the gap between the plate surface of the flat tube 4 and the plate 101, affecting the distribution of the refrigerant and affecting the heat exchange efficiency; in addition, the refrigerant circulates in the through holes of the flat tube, and the working pressure of the refrigerant mainly acts on the flat tube 4, which may also improve the structural strength of the heat exchanger.

[0040] Reference Fig.10The flat tube 4 includes a first side wall 43 and a second side wall 44, which are respectively on both sides of the flat tube 4 along the width direction of the flat tube 4, and extend along the length direction of the flat tube 4. In this embodiment, the first side wall 43 is arranged in contact with the flange 1011, and the second side wall 44 is arranged in contact with the flange 1011, so that the refrigerant flows in the through hole 41 of the flat tube 4, and the working pressure of the refrigerant mainly acts on the flat tube 4, and the flat tube 4 has a strong pressure bearing capacity, which is conducive to improving the structural strength of the heat exchanger; in addition, the working pressure of the refrigerant acts less on the plate 101, which is conducive to avoiding deformation of the plate 101 or cracking of the weld between adjacent plates 101 when the working pressure of the refrigerant is too high. In other embodiments, the first side wall 43 and the flange 1011 may also be gap-fitted, and the second side wall 44 and the flange 1011 may also be gap-fitted. The gap between the first side wall 43 and the flange 1011 may provide a flow channel for the refrigerant, and the gap between the second side wall 44 and the flange 1011 may also provide a flow channel for the refrigerant. In this way, the refrigerant can be distributed and a flow path can be provided for the refrigerant.

[0041] In other embodiments, the flat tube 4 may also be provided with multiple rows of through holes 41, the through holes 41 are arranged in rows along the width direction of the heat exchanger, and the through holes 41 are arranged in columns along the height direction of the heat exchanger. The provision of multiple rows of through holes 41 can increase the flow path of the refrigerant and improve the heat exchange efficiency. In other embodiments, the through holes 41 may also be randomly arranged along the height direction and the width direction of the heat exchanger. In this embodiment, the through holes 41 are regular circular through holes, which facilitates the forming of the through holes 41. In other embodiments, the through holes 41 may also be wavy or other shaped through holes 41, that is, the inner peripheral wall of the through holes 41 is wavy or other shapes.

[0042] In another embodiment, the heat exchanger includes a plurality of flat tubes 4, which are stacked together along the stacking direction of the plates 101, and adjacent flat tubes 4 are welded and fixed. Each flat tube 4 includes a plurality of through holes 41. Such a configuration can also provide more flow paths for the refrigerant, thereby enhancing the heat exchange performance of the heat exchanger.

[0043] Reference Fig.11 In another embodiment, a plurality of flat tubes 4 are arranged at intervals along the length direction of the plate 101, and the through holes 41 of the flat tubes 4 are arranged along the length direction of the plate 101. There is a gap between adjacent flat tubes 4 for the flow of refrigerant, so that the refrigerant can flow from the through hole 41 of one flat tube 4 through the gap to the through hole 41 of the next flat tube 4, which is conducive to increasing the flow path of the refrigerant, increasing the heat exchange area, and improving the heat exchange efficiency of the heat exchanger. In other embodiments, the plate 101 is arranged along the length direction, and a drainage structure, such as a protrusion, can also be set in the gap between adjacent flat tubes 4 to drain the refrigerant in the through hole 41 of one flat tube 4 to the through hole 41 of another flat tube 4, so as to facilitate the distribution of the refrigerant.

[0044] Reference Fig.12 In another embodiment, the heat exchanger includes a plurality of flat tubes 4, and the plurality of flat tubes 4 are arranged at intervals along the width direction of the plate 101, and the gaps between adjacent flat tubes 4 can allow the refrigerant to flow, so that heat exchange between the refrigerant and the coolant can also be achieved.

[0045] In other embodiments, a plurality of flat tubes 4 are arranged at intervals along the length direction of the plate 101, and there are gaps between the flat tubes 4 arranged along the length direction of the plate 101. At the same time, another plurality of flat tubes 4 are arranged at intervals along the width direction of the plate 101, and there are gaps between the flat tubes arranged along the width direction of the plate 101. This can further increase the flow path of the refrigerant and improve the heat exchange efficiency of the heat exchanger.

[0046] Combination Figure 6-Figure 9 In this embodiment, the plate 3 includes a plurality of drainage portions 31, and the drainage portions 31 are located in the first corner hole area 6, and the drainage portions 31 are located at the periphery of the first corner hole 61. In this embodiment, the drainage portions 31 are arranged close to the heat exchange area 1012, and a plurality of drainage portions 31 are arranged at intervals along the periphery of the first corner hole 61. In this embodiment, the drainage portion 31 protrudes downward relative to the upper plate surface of the plate 3, and the drainage portion 31 has a groove, and the drainage portion 31 has an upward opening. The drainage portion 31 includes a drainage groove 311, and the first channel 104 is connected to the through hole 41 on the flat tube 4 through the drainage groove 311. The setting of the drainage portion 31 can distribute the refrigerant to the through hole 41 of the flat tube 4 in multiple routes, so as to meet the distribution of the refrigerant in the first corner hole area 6 and improve the heat exchange effect. In this embodiment, a plurality of drainage portions 31 are arranged, which is conducive to improving the distribution of the refrigerant.

[0047] In this embodiment, the plate 3 also includes a plurality of first boss portions 33, the first boss portions 33 are located in the first corner hole area 6, the first boss portions 33 are located at the outer periphery of the first corner hole 61, the first boss portions 33 protrude upward relative to the upper plate surface of the plate 3, a plurality of first boss portions 33 and a plurality of drainage portions 31 are spaced around the outer periphery of the first corner hole 61, and the first boss portions 33 protrude upward relative to the upper plate surface of the plate 3.

[0048] In this embodiment, the plate 2 includes a plurality of third protrusions 26 that cooperate with the drainage portion 31, and the plate 2 also includes a plurality of second protrusions 21 that cooperate with the first protrusion 33. The plurality of third protrusions 26 and the plurality of second protrusions 21 are arranged at intervals along the outer periphery of the first angular hole 61, and the third protrusions 26 protrude toward the plate 1, and the third protrusions 26 have a groove. The second protrusion 21 protrudes downward relative to the lower plate surface of the plate 2, the second protrusion 21 and the first protrusion 33 are in contact and welded, the third protrusion 26 and the drainage portion 31 enclose a first channel 63, the first channel 63 is connected to the through hole 41 of the flat tube 4, and the drainage portion 31 guides the refrigerant to the through hole 41 of the flat tube 4.

[0049] In this embodiment, the second corner hole area 7 of the plate 3 includes a plurality of lead-out portions 32, and the plurality of lead-out portions 3 are located at the periphery of the fourth corner hole 72. The lead-out portions 32 are arranged close to the heat exchange area 1012, and the plurality of lead-out portions 32 are arranged at intervals around the periphery of the fourth corner hole 72. The lead-out portion 32 protrudes downward relative to the upper plate surface of the plate 3, and the lead-out portion 32 has a groove, and the lead-out portion 32 has an upward opening. In this embodiment, the lead-out portion 32 includes a lead-out groove 321, and the fourth channel 107 is connected to the through hole 41 on the flat tube 4 through the lead-out groove 321. The setting of the lead-out groove 321 can guide the refrigerant in the through hole 41 of the flat tube 4 to the fourth channel 107, and the refrigerant flows out of the heat exchanger from the fourth channel 107, which is conducive to reducing the flow resistance of the refrigerant and reducing the pressure drop of the refrigerant. In this embodiment, a plurality of lead-out grooves 321 are provided, which is conducive to increasing the outflow path of the refrigerant and reducing the outflow resistance of the refrigerant.

[0050] In this embodiment, the second corner hole area 7 of the plate 3 further includes a plurality of third bosses 34, the third bosses 34 protrude upward relative to the upper plate surface of the plate 3, the third bosses 34 are located at the periphery of the fourth corner hole 72, the third bosses 34 are arranged close to the heat exchange area 1012, and a plurality of second bosses 21 and a plurality of lead-out portions 32 are arranged at intervals along the periphery of the fourth corner hole 72. In this embodiment, the plate 2 includes a plurality of fourth bosses 22 that cooperate with the third bosses 34, the plate 2 includes a plurality of fourth protrusions 27 that cooperate with the lead-out portions, and a plurality of fourth protrusions 27 and a plurality of fourth bosses 22 are arranged at intervals along the periphery of the fourth corner hole 72. The fourth protrusion 27 protrudes upward relative to the lower plate surface of the plate 2, and the fourth protrusion 27 has a groove. The fourth boss 22 protrudes downward relative to the lower plate surface of the plate 2, and the third boss 34 and the fourth boss 22 are in contact and welded connection. The fourth protrusion 27 and the lead-out portion 32 form a channel, namely a fourth channel 74 , for the refrigerant to flow from the through hole 41 of the flat tube 4 into the fourth channel 107 through the fourth channel 74 . The lead-out portion 32 guides the second fluid in the through hole 41 to the fourth channel 107 .

[0051] In this embodiment, the plate 2 and the plate 3 are welded in a whole circle around the outer circumference near the second corner hole 62, and the second channel 105 and the through hole 41 of the flat tube 4 are not connected. The plate 2 and the plate 3 are welded in a whole circle around the outer circumference near the third corner hole 71, and the third channel 106 and the through hole 41 of the flat tube 4 are not connected.

[0052] In this embodiment, the plate 1 and the plate 2 have a second hole 64 on the outer periphery near the second corner hole 62, the second hole 64 is connected to the first inter-plate channel S, and the second channel 105 is connected to the first inter-plate channel S through the second hole 64; the plate 1 and the plate 2 have a third hole 73 on the outer periphery near the third corner hole 71, the third hole 73 is connected to the first inter-plate channel S, and the third channel 106 is connected to the first inter-plate channel S through the third hole 73. The plate 1 and the plate 2 are welded in a full circle on the outer periphery near the first corner hole 61, and the first channel 104 is not connected to the first inter-plate channel S. The plate 1 and the plate 2 are welded in a full circle on the outer periphery near the fourth corner hole 72, and the fourth channel 107 is not connected to the first inter-plate channel S.

[0053] In this embodiment, the drainage groove 311 is a narrow groove, and the area of ​​the drainage groove 311 is small, so that the area of ​​the first boss portion 33 is relatively large, and the area of ​​the first boss portion 33 is much larger than the area of ​​the drainage portion 31, which is conducive to increasing the welding area of ​​the first boss portion 33 and the second boss portion 21, increasing the density of the welding points of the first corner hole 61, and ensuring the structural reliability of the plate 2 and the plate 3 after welding, thereby improving the structural strength of the heat exchanger and its pressure bearing capacity for the refrigerant. The setting of the first boss portion 33 can also ensure the wall thickness of the first channel 104 and the strength of the structure after welding. In addition, the first boss portion 33 and the second boss portion 21 surround a channel, namely the first channel 63, for the refrigerant to flow from the first channel 104 through the first channel 63 into the through hole 41 of the flat tube 4. In other embodiments, only one drainage portion 31 can also be set.

[0054] In this embodiment, the lead-out groove 321 is a narrow groove, so that the area of ​​the third boss portion 34 is relatively large, which is also conducive to increasing the welding area between the plate 3 and the plate 2, increasing the density of the welding points around the fourth corner hole 72, and further improving the structural strength of the heat exchanger. The setting of the third boss portion 34 can also ensure the wall thickness of the fourth channel 107 and the strength of the structure after welding. The setting of the first boss portion 33, the second boss portion 21, the third boss portion 34 and the fourth boss portion 22 can also ensure the distance between the plate 3 and the plate 2, and facilitate the sealing between some corner holes. In other embodiments, only one lead-out portion 32 can also be provided.

[0055] In this embodiment, the density of solder joints around the first corner hole 61 and the density of solder joints around the fourth corner hole 72 are relatively greater than the density of solder joints around the second corner hole 62, and the density of solder joints around the first corner hole 61 and the density of solder joints around the fourth corner hole 72 are relatively greater than the density of solder joints around the third corner hole 71. This arrangement can improve the heat exchanger's ability to withstand the working pressure of the refrigerant, especially the carbon dioxide refrigerant. The density of solder joints around the second corner hole 62 and the third corner hole 71 is small, which can save solder and meet the heat exchanger's ability to withstand the working pressure of the coolant. Of course, in other embodiments, the density of solder joints around the four corner holes is basically the same.

[0056] In other embodiments, when part of the flat tube 4 is located in the heat exchange area 1012 and part of the flat tube 4 is located in the first corner hole area 6 and / or the second corner hole area 7, a drainage portion 31 and a lead-out portion 32 are also required to be provided on the side of the first corner hole area 6 and / or the second corner hole area 7 close to the flange 1011, so as to increase the contact area between the refrigerant and the flat tube 4 and increase the strength of the heat exchanger.

[0057] Combination Figure 2-Figure 5 In this embodiment, the heat exchanger further includes fins 5, which are located in the second accommodating cavity 25, and at least part of the fins 5 are located in the heat exchange zone 1012. The wall forming the first inter-plate channel S includes the fins 5. The upper end surface of the fins 5 is welded and fixed to the lower plate surface of the plate 1, and the lower end surface of the fins 5 is welded and fixed to the upper plate surface of the plate 2. In this embodiment, the fins 5 include a plurality of fifth protrusions 51 and first grooves 52, the fifth protrusions 51 have a downward opening, the first grooves 52 have an upward opening, and there is at least one first groove 52 between adjacent fifth protrusions 51. The fifth protrusions 51 and the first grooves 52 form a coolant flow channel. The arrangement of the fins 5 can increase the flow path of the coolant, which is beneficial to improve the heat exchange between the refrigerant and the coolant. This application only illustrates a structure of the fins 5. In other embodiments, the fins 5 may also be provided with only the fifth protrusions 51 or only the first grooves 52, and the forms of the fins 5 may be various. In other embodiments, the heat exchanger may not be provided with fins, and there is no turbulent structure between the plate 1 and the plate 2, and the coolant flows between the plate surfaces of the plate 1 and the plate 2.

[0058] Figure 13-Figure 17In the second embodiment of the heat exchanger, the heat exchanger is not provided with fins 5, and the plate 101 is a point wave plate. In this embodiment, the plate 2 has a plurality of first protrusions 24, and the plurality of first protrusions 24 are arranged at intervals. The first protrusions 24 protrude upward relative to the upper plate surface of the plate 2, and the first protrusions 24 protrude toward the plate 1. The first protrusions 24 have a groove on the side facing the plate 3, and grooves are formed between adjacent first protrusions 24. The coolant needs to bypass the first protrusions 24. The arrangement of the first protrusions 24 is conducive to increasing the turbulence effect of the plate 2 on the coolant, and can also increase the flow path of the coolant, increase the contact area between the coolant and the refrigerant, and improve the heat exchange efficiency. Correspondingly, a second protrusion 12 is provided on the plate 1, and the second protrusion 12 protrudes downward relative to the lower plate surface of the plate 1, and the second protrusion 12 protrudes toward the plate 2. The second protrusion 12 has a groove on the side away from the plate 2, and a groove is formed between adjacent second protrusions 12. The bottom end of at least part of the second protrusion 12 is in contact with and welded to the top end of the first protrusion 24, and a coolant channel is formed between the first protrusion 24 and the second protrusion 12, which can increase the flow space of the coolant; in addition, the coolant flow needs to bypass the protrusion of the second protrusion 12, which can further increase the flow path of the coolant and increase the turbulence effect of the plate 101 on the coolant. The welding of the second protrusion 12 and the first protrusion 24 can also enhance the connection strength of the plate 101. In other embodiments, the plate 2 may have the first protrusion 24, the plate 1 may not have the second protrusion 12, and the second protrusion may contact and weld with the lower surface of the plate 2; or, the plate 2 may not have the first protrusion 24, the plate 1 may have the second protrusion 12, and the second protrusion 12 may contact and weld with the upper surface of the plate 2, which may also increase the flow path of the coolant.

[0059] In this embodiment, the plate 3 and the plate 1 have a first convex portion 37, the corner hole area of ​​the plate 3 has a first convex portion 37, the first convex portion 37 is the first convex portion 37 protruding toward the plate 2, the first convex portion 37 has a groove on the side away from the plate 2, and the first convex portion 37 is arranged on the outer periphery of the first corner hole 61 of the plate 3 and the outer periphery of the fourth corner hole 72. Near the outer periphery of the first corner hole 61 of the plate 3, a groove is formed between adjacent first convex portions 37, and the refrigerant is guided from the first channel 104 to the through hole 41 of the flat tube 4, and near the outer periphery of the fourth corner hole 72 of the plate 3, a groove is formed between adjacent first convex portions 37, and the refrigerant is guided from the through hole 41 of the flat tube 4 to the fourth channel 107.

[0060] In this embodiment, the corner hole area of ​​the plate 2 has a second convex portion 28 that cooperates with the first convex portion 37. The second convex portion 28 is arranged at the periphery of the first corner hole 61 and the periphery of the fourth corner hole 72 of the plate 1. The second convex portion 28 protrudes toward the plate 3, and the second convex portion 28 has a groove on the side close to the plate 1. Close to the periphery of the first corner hole 61, the second convex portion 28 of the plate 2 and the first convex portion 37 of the plate 3 are in contact and welded to each other, which can increase the connection strength between the plate 3 and the plate 2, improve the strength of the heat exchanger, and increase the pressure bearing capacity of the heat exchanger.

[0061] In other embodiments, the plate 3 is not provided with the first protrusion 37, the plate 2 is not provided with the second protrusion 28, the drainage portion 31 and the first boss portion 33 are provided on the periphery of the first corner hole 61 of the plate 3, the lead-out portion 32 and the third boss portion 34 are provided on the periphery of the fourth corner hole 72 of the plate 3, the third protrusion 26 and the second boss portion 21 are provided on the periphery of the first corner hole 61 of the plate 2, and the fourth protrusion 27 and the fourth boss portion 22 are provided on the periphery of the fourth corner hole 72 of the plate 2, so as to realize the drainage effect on the refrigerant and enhance the strength of the heat exchanger.

[0062] In other embodiments, the plate 2 can also be a single herringbone wave plate or a multiple herringbone wave plate (not shown in the figure), and the single herringbone wave means that the first protrusion 24 includes two extension sections (not shown in the figure) set at an angle, each extension section is inclined relative to the length direction of the plate 101, and the two extension sections can be symmetrically set along the width direction of the plate 101, or asymmetrically set. Multiple herringbone waves mean that the first protrusion 24 includes a plurality of extension sections set at an angle, each extension section is inclined relative to the length direction of the plate 101, and the number of extension sections is greater than two. Of course, in other embodiments, the plate 101 can also be provided with other forms of structures to increase the flow path of the coolant. The present application only illustrates the structure of two point wave plates 101, and the forms of the first protrusion 24 and the second protrusion 12 are not limited to the above description, and the first protrusion 24 and the second protrusion 12 can be diverse.

[0063] In other embodiments, flat tubes 4 are provided between adjacent plates, and cooling liquid flows through the through holes 41 between the plate 101 and its adjacent plate 101, and refrigerant flows through the through holes 41 between the plate 101 and another adjacent plate 101, and the cooling liquid and the refrigerant flow in the through holes 41 of the flat tubes 4 to exchange heat. For example, flat tubes 4 are provided between the plate 1 and the plate 2, and flat tubes 4 are also provided between the plate 2 and the plate 3, and the flat tubes 4 between the plate 1 and the plate 2 are for the refrigerant to flow, and the flat tubes 4 between the plate 2 and the plate 3 are for the refrigerant to flow, so that the refrigerant and the cooling liquid can also exchange heat.

[0064] Figure 18-Figure 19In the third embodiment of the heat exchanger, the plate 2 includes a first rib 23, and the coolant flows in a U-shaped loop. The plate 3 includes a second rib 35, and the refrigerant flows in a U-shaped loop. In this embodiment, the first rib 23 protrudes upward relative to the upper plate surface of the plate 2, and the first rib 23 is arranged along the length direction of the heat exchanger. In this embodiment, one end of the first rib 23 is connected to the flange 1011 close to the first end 1013, and the other end of the first rib 23 and the second end 1014 are located in the heat exchange area 1012. This arrangement facilitates the change of the flow direction of the coolant. The first rib 23 divides the plate 2 into the front and rear sides, and the first rib 23 divides the first inter-plate channel S into two loops, namely the first loop and the second loop. In this embodiment, the third channel 106 is the inlet channel of the coolant, and the fourth channel 107 is the outlet channel of the coolant. The coolant first flows into the first circuit from the third channel 106, then flows to the second circuit, and then flows from the second circuit to the fourth channel 107, and flows out of the heat exchanger from the fourth channel 107. The setting of the first rib 23 allows the coolant to flow in a U-shaped loop, which can increase the flow path of the coolant and improve the heat exchange effect of the heat exchanger. In the present application, the first rib 23 is arranged in a straight line roughly along the length direction of the plate 101. In other embodiments, the first rib 23 can also be other shapes, such as Z-shaped, U-shaped or wavy. In other embodiments, one end of the first rib 23 can also be connected to the flange 1011 close to the first end 1013, and the other end of the first rib 23 is located in the second corner hole area 7, and the other end of the first rib 23 does not contact the flange 1011.

[0065] In this embodiment, the plate 3 includes a second rib 35, which is raised upward relative to the upper plate surface of the plate 3, and extends along the length direction of the heat exchanger. In this embodiment, one end of the second rib 35 is connected to the flange 1011 near the second end 1014, and the other end of the second rib 35 is located in the heat exchange area 1012. The second rib 35 divides the plate 3 into a front side and a rear side, and the front side and the rear side are respectively provided with flat tubes 4. In this embodiment, the first channel 104 is an inlet channel of the refrigerant, and the second channel 105 is an outlet channel of the refrigerant. The refrigerant first flows from the first channel 104 into the through hole 41 of the flat tube 4 on one side, then flows to the through hole 41 of the flat tube 4 on the other side, and then flows to the second channel 105, and flows out of the heat exchanger from the second channel 105. The second rib 35 is provided to make the refrigerant flow in a U-shaped loop, so that the flow path of the refrigerant can be increased, and the heat exchange effect of the heat exchanger can be improved. In the present application, the second rib 35 is arranged in a straight line roughly along the length direction of the plate 101. In other embodiments, the second rib 35 can also be other shapes, such as Z-shaped, U-shaped or wavy. In other embodiments, one end of the second rib 35 can also be connected to the flange 1011 close to the second end 1014, and the other end of the second rib 35 is located in the first corner hole area 6, and the other end of the first rib 23 does not contact the flange 1011. In other embodiments, the plate 2 can also be provided with the first rib 23, the coolant flows in a U-shaped loop, and the plate 3 is not provided with the second rib 35; or, the plate 2 is not provided with the first rib 23, the plate 3 is provided with the second rib 35, and the refrigerant flows in a U-shaped loop.

[0066] Combination Figure 20-22, showing a fourth embodiment of the heat exchanger, the heat exchanger includes a drainage pipe 8, and the refrigerant has multiple flow sections. In this embodiment, the heat exchanger includes a first side 102 and a second side 103, and the first side 102 is located below the second side 103. The first channel 104 includes a first pipe section 1041 and a second pipe section 1042, the first pipe section 1041 is located below the second pipe section 1042, the first pipe section 1041 is located on the first side 102 of the heat exchanger, and the second pipe section 1042 is located on the second side 103 of the heat exchanger. The second side 103 includes a damping plate 9, the damping plate 9 is located on the first side 102, the damping plate 9 is the uppermost plate 101 on the first side 102, and the damping plate 9 is close to the second side 103 of the heat exchanger. In this embodiment, at least part of the drainage pipe 8 is located in the first pipe section 1041, the drainage pipe 8 and the inner peripheral wall forming the first corner hole 61 are gap-matched, the outer peripheral wall of the drainage pipe 8 and the damping plate 9 are welded, the drainage pipe 8 includes a first flow channel 81, the outer peripheral wall of the drainage pipe 8 makes the first flow channel 81 and the through hole 41 of the first side 102 not connected, and the refrigerant flowing into the first flow channel 81 cannot enter the through hole 41 of the first side 102, and the second pipe section 1042 and the through hole 41 of the second side 103 remain connected. The refrigerant flows into the first flow channel 81 from the inlet of the first flow channel 81, directly enters the second pipe section 1042 from the first flow channel 81, then flows to the through hole 41 of the flat tube 4 on the second side 103, then flows from the through hole 41 of the flat tube 4 on the second side 103 to the fourth channel 107, and then flows from the fourth channel 107 to the gap between the outer peripheral wall of the drainage pipe 8 and the inner peripheral wall forming the first corner hole 61, and flows out of the heat exchanger.

[0067] In this embodiment, the upper end of the drainage pipe 8 is located at the second pipe section 1042, and the outer peripheral wall of the drainage pipe 8 does not hinder the communication between the second pipe section 1042 and the first inter-plate channel S, so that the refrigerant does not flow into the through hole 41 of the flat tube 4 on the second side 103, which is conducive to ensuring the heat exchange efficiency of the heat exchanger; in addition, the upper end of the drainage pipe 8 extends to the second pipe section 1042, which makes it easier to ensure that the first pipe section 1041 and the through hole 41 of the first side 102 are not connected. In other embodiments, the drainage pipe 8 is located on the first side 102, and the upper end of the drainage pipe 8 does not extend into the second pipe section 1042. In other embodiments, the drainage pipe 8 may also extend more into the second pipe section 1042, and the outer peripheral wall of the drainage pipe 8 will hinder the communication between part of the second pipe section 1042 and the through hole 41 of the flat tube 4 on the second side 103, and there may be no refrigerant flowing into the through hole 41 of the flat tube 4, affecting the heat exchange performance of the heat exchanger. This solution only illustrates one flow path. In other embodiments, the refrigerant can realize a multi-flow loop through other flow paths to improve the heat exchange effect. In other embodiments, the coolant can also flow in multiple flows.

[0068] In other embodiments, a baffle may be provided in the first channel 104, and the baffle and the plate surface of the plate 101 are substantially parallel to each other, and the baffle divides the first channel 104 into two channels, an upper channel and a lower channel, so that a multi-flow circuit of the refrigerant can be realized. The baffle may be formed by the plate 101, or an additional baffle may be provided, and the baffle and the plate 101 are welded.

[0069] In other embodiments, the plate 3 may be provided with a second rib 35, and the heat exchanger may be further provided with a drainage pipe 8 or a baffle, so that the refrigerant flows in a U-shaped loop, and the refrigerant has three or four or more flow sections.

[0070] It should be noted that: It should be noted that: the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify or replace the application with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A heat exchanger, characterized in that: The invention comprises a flat tube (4) and a plurality of plates (101), wherein the plurality of plates (101) are stacked and arranged, and along the stacking direction of the plates (101), the flat tube (4) is arranged between at least one group of adjacent plates (101), and the flat tube (4) has a plurality of through holes (41). A first inter-plate channel (S) is provided between at least another group of adjacent plates (101). The heat exchanger comprises a first flow channel and a second flow channel, wherein the first flow channel and the second flow channel are not connected, and the fluid in the first flow channel can exchange heat with the fluid in the second flow channel, and the through holes (41) of the flat tube (4) are part of the first flow channel, and the first inter-plate channel (S) is part of the second flow channel.

2. The heat exchanger according to claim 1, characterized in that: A flat tube (4) is provided between at least one of the plates (101) and an adjacent plate (101), and a first inter-plate channel (S) is provided between the plate (101) and another adjacent plate (101).

3. The heat exchanger according to claim 1 or 2, characterized in that: A flat tube (4) is provided between the plate (101) and an adjacent plate (101), and a first inter-plate channel (S) is provided between the plate (101) and another adjacent plate (101), wherein the first inter-plate channel (S) and the flat tube (4) are alternately arranged along the stacking direction of the plates (101).

4. The heat exchanger according to any one of claims 1 to 3, characterized in that: The plurality of plates (101) include a plate (1), a plate (2), and a plate (3), wherein the plates (1), (2), and (3) are stacked in sequence, and the heat exchanger further includes a fin (5), wherein the fin (5) is located between the plate (2) and the plate (1) adjacent thereto, and the wall forming the first inter-plate channel (S) includes the fin (5).

5. The heat exchanger according to any one of claims 1 to 3, characterized in that: The plurality of plates (101) comprise a plate (1), a plate (2), and a plate (3); the plate (1), the plate (2), and the plate (3) are stacked in sequence; the plate (2) comprises a plurality of first protrusions (24); the first protrusions (24) protrude toward the plate (1); the first protrusions (24) have grooves on a side facing the plate (3); and grooves are formed between adjacent first protrusions (24); And / or, the plate (1) comprises a plurality of second protrusions (12), the second protrusions (12) protrude toward the plate (2), the second protrusions (12) have grooves on a side facing away from the plate (2), and grooves are formed between adjacent second protrusions (12).

6. The heat exchanger according to claim 4 or 5, characterized in that: The flat tube (4) and the plate (101) are parallel to each other, the upper surface of the flat tube (4) is welded to the plate (2), the lower surface of the flat tube (4) is welded to the plate (3), and the through hole (41) penetrates the flat tube (4) along the length direction of the flat tube (4).

7. The heat exchanger according to claim 6, characterized in that The flat tube (4) comprises one flat tube (4), and the flat tube (4) comprises a plurality of through holes (41); Alternatively, the flat tube (4) comprises a plurality of flat tubes (4), each of the plurality of flat tubes (4) comprises a plurality of through holes (41), and the plurality of flat tubes (4) are stacked and arranged along the height direction of the heat exchanger; or, the plurality of flat tubes (4) are arranged at intervals along the width direction of the heat exchanger, and / or, the flat tubes (4) are arranged at intervals along the length direction of the heat exchanger.

8. The heat exchanger according to claim 7, characterized in that The plate (101) comprises a body (1015) and a flange (1011); the body (1015) comprises a heat exchange zone (1012); the flange (1011) is arranged along the circumference of the body (1015); the flange (1011) protrudes upward relative to the body (1015); at least part of the flat tube (4) is located in the heat exchange zone (1012); the flat tube (4) comprises a first side wall (43) and a second side wall (44); the first side wall (43) and the second side wall (44) are located on both sides of the flat tube (4) along the width direction of the flat tube (4); the first side wall (43) and the flange (1011) are clearance-fitted or contact-arranged; the second side wall (44) and the flange (1011) are clearance-fitted or contact-arranged.

9. The heat exchanger according to claim 8, characterized in that The heat exchanger comprises a first channel (104), a second channel (105), a third channel (106) and a fourth channel (107). Along the width direction of the heat exchanger, the first channel (104) and the third channel (106) are located on the same side of the heat exchanger, the second channel (105) and the fourth channel (107) are located on the same side of the heat exchanger, the first channel (104) and the fourth channel (107) are arranged diagonally, and the second channel (105) and the third channel (106) are arranged diagonally. Two of the four channels are for the circulation of a first fluid, which are connected through the through holes (41) of the flat tubes (4) and are not connected to the first inter-plate channels (S). The other two of the four channels are for the circulation of a second fluid, which are connected through the first inter-plate channels (S) and are not connected to the through holes (41).

10. The heat exchanger according to claim 11, characterized in that The body (1015) of the plate (101) comprises a first corner hole area (6) and a second corner hole area (7); along the length direction of the heat exchanger, the plate (101) comprises a first end (1013) and a second end (1014); the first corner hole area (6) is close to the first end (1013); the second corner hole area (7) is close to the second end (1014); the heat exchange area (1012) is located between the first corner hole area (6) and the second corner hole area (7); the first corner hole area (6) comprises a first corner hole (61) and a second corner hole (62); the second corner hole area (7) comprises a third corner hole (71) and a fourth corner hole (72); the first corner holes (61) of the plurality of plates (101) are at least partially aligned along the stacking direction of the plates (101) to form the first channel (104); the plurality of plates (101) The second corner holes (62) of the plates (101) are at least partially aligned along the stacking direction of the plates (101) to form the second channel (105); the third corner holes (71) of the plates (101) are at least partially aligned along the stacking direction of the plates (101) to form the third channel (106); the fourth corner holes (72) of the plates (101) are at least partially aligned along the stacking direction of the plates (101) to form the fourth channel (107); the second channel (105) passes through the first inter-plate channel (S) and the third channel (106); the second channel (105) and the third channel (106) allow a first fluid to flow; the first channel (104) and the fourth channel (107) are connected through the through hole (41) of the flat tube (4); the first channel (104) and the fourth channel allow a second fluid to flow.

11. The heat exchanger according to claim 9 or 10, characterized in that: The plate (3) comprises a plurality of drainage portions (31) and a plurality of first boss portions (33), the plurality of drainage portions (31) and the plurality of first boss portions (33) being arranged at intervals along the outer periphery of the first angular hole (61), the drainage portion (31) protruding downward relative to the upper plate surface of the plate (3), the drainage portion (31) having a groove, the first boss portion (33) protruding upward relative to the upper plate surface of the plate (3), the plate (2) comprising a plurality of third boss portions (26) cooperating with the drainage portion (31), the plate (2) further comprising a plurality of second boss portions (21) cooperating with the first boss portion (33), the plurality of third boss portions (26) and the plurality of second boss portions (21) being arranged along the outer periphery of the first angular hole (61), The third protrusion (26) is arranged at intervals on the outer periphery of the plate (1), the third protrusion (26) protrudes toward the plate (1), the third protrusion (26) has a groove, the second boss portion (21) protrudes downward relative to the lower plate surface of the plate (2), the second boss portion (21) and the first boss portion (33) are in contact and welded, the third protrusion (26) and the drainage portion (31) surround the first channel (63), the first channel (63) is connected to the through hole (41) of the flat tube (4), the plate (3) includes a plurality of lead-out portions (32) and a plurality of third boss portions (34), the plurality of third boss portions (34) and the plurality of lead-out portions (32) are arranged at intervals along the outer periphery of the fourth corner hole (72), the lead-out portions ( The lead-out portion (32) is recessed downwardly relative to the upper plate surface of the plate (3), the lead-out portion (32) has a groove, the third boss portion (34) protrudes upwardly relative to the upper plate surface of the plate (3), the plate (2) further comprises a plurality of fourth boss portions (27) and a plurality of fourth boss portions (22), the plurality of fourth boss portions (27) and the plurality of fourth boss portions (22) are arranged at intervals along the outer periphery of the fourth corner hole (72), the fourth boss portion (27) protrudes upwardly relative to the lower plate surface of the plate (2), the fourth boss portion (27) has a groove, the fourth boss portion (22) protrudes downwardly relative to the lower plate surface of the plate (2), the third boss portion (34) and the fourth boss portion (22) are welded, and the fourth boss portion (27) is welded to the fourth boss portion (22). The starting portion (27) and the lead-out portion (32) form the fourth channel (74), the fourth channel (74) is connected to the through hole (41) of the flat tube (4), the plate (2) and the plate (3) are welded in a full circle at the outer circumference near the second corner hole (62), the second channel (105) and the first inter-plate channel (S) are not connected, the plate (2) and the plate (3) are welded in a full circle at the outer circumference near the third corner hole (71), the third channel (106) and the first inter-plate channel (S) are not connected, the plate (1) and the plate (2) have a third channel (73) at the outer circumference near the second corner hole (62), the third channel (73) and the first inter-plate channel (S) are connected,The plate (1) and the plate (2) have a third hole (73) at the outer periphery near the third corner hole (71), and the third hole (73) is connected to the first inter-plate channel (S). The plate (1) and the plate (2) are welded in a full circle at the outer periphery near the first corner hole (61), and the first channel (104) and the first inter-plate channel (S) are not connected. The plate (1) and the plate (2) are welded in a full circle at the outer periphery near the fourth corner hole (72), and the fourth channel (107) and the first inter-plate channel (S) are not connected.

12. The heat exchanger according to claim 10, characterized in that The plate (3) has a first convex portion (37), the first convex portion (37) is located on the outer periphery of the first corner hole (61) and the outer periphery of the fourth corner hole (72), the first convex portion (37) protrudes toward the plate (2), the first convex portion (37) has a groove on the side away from the plate (2), and a groove is formed between adjacent first convex portions (37), the plate (2) has a second convex portion (28) cooperating with the first convex portion (37), the second convex portion (28) is located on the outer periphery of the first corner hole (61) and the outer periphery of the fourth corner hole (72), the second convex portion (28) protrudes toward the plate (3), the second convex portion (28) has a groove on the side close to the plate (1), and the second convex portion (28) and the first convex portion (37) are in contact and welded to each other.

13. The heat exchanger according to claim 11, characterized in that At least part of the guide portion (31) is located in the first corner hole area (6), and the guide portion (31) guides the second fluid to the through hole (41) of the flat tube (4); at least part of the outlet portion (32) is located in the second corner hole area (7), and the outlet portion (32) guides the second fluid in the through hole (41) to the fourth channel (107).

14. The heat exchanger according to claim 12, characterized in that The area of ​​the first boss portion (33) is larger than the area of ​​the drainage portion (31), and / or the area of ​​the third boss portion (34) is larger than the area of ​​the outlet portion (32).

15. The heat exchanger according to claim 3, 12 or 14, characterized in that: The plate (2) comprises a first rib (23), the first rib (23) protruding upward relative to the upper plate surface of the plate (2), the first rib (23) extending along the length direction of the heat exchanger, one end of the first rib (23) being connected to a flange (1011) close to the first end (1013), and the other end of the first rib (23) not in contact with the flange (1011) close to the second end (1014).

16. The heat exchanger according to claim 3, 14 or 15, characterized in that: The plate (3) includes a second rib (35), the second rib (35) protruding upward relative to the upper plate surface of the plate (2), the second rib (35) extending along the length direction of the heat exchanger, one end of the second rib (35) being connected to a flange (1011) close to the second end (1014), and the other end of the second rib (35) not in contact with the flange (1011) close to the first end (1013).

17. The heat exchanger according to claim 9 or 16, characterized in that: The heat exchanger comprises a first side (102) and a second side (103), the first side (102) being located below the second side (103), the first channel (104) comprising a first pipe section (1041) and a second pipe section (1042), the first pipe section (1041) being located below the second pipe section (1042), the heat exchanger further comprises a drainage pipe (8), at least a portion of the drainage pipe (8) being located in the first pipe section (1041), the drainage pipe (8) and an inner peripheral wall forming the first angular hole (61) being clearance-matched, the heat exchanger further comprises a damping plate (9), the damping plate (9) being located on the first side (102), close to the second side (103), the outer peripheral wall of the drainage pipe (8) and the damping plate (9) being welded together.

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