Heat exchanger and waste heat recovery system

Abstract

The invention provides a heat exchanger and a waste heat recovery system.The heat exchanger comprises a first heat exchange assembly and a second heat exchange assembly, the first heat exchange assembly comprises a first collecting pipe set, and the first collecting pipe set comprises two first collecting pipes arranged at intervals; the first flat pipes are arranged at intervals in the axial direction of the first collecting pipe; the second heat exchange assembly comprises a second flow collecting pipe set, and the second flow collecting pipe set comprises second flow collecting pipes; the second flat pipes are arranged at intervals in the axial direction of the second collecting pipe; the first heat exchange assembly comprises a plurality of first heat exchange fins, and the first heat exchange fins are arranged between every two adjacent first flat pipes and are in conduction connection with at least one of every two adjacent first flat pipes. The heat exchanger can be efficiently suitable for heat recovery of a condenser on an air-cooled heat pump, the heat exchanger can be applied to a hot water supply system for waste heat recovery, then heat of the condenser is effectively utilized, and the effects of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery equipment technology, and more specifically, to a heat exchanger and a waste heat recovery system. Background Technology

[0002] Currently, existing waste heat recovery systems for air conditioning systems are widely used in buildings with stable hot water demand due to their significant energy-saving effects. Existing air conditioning systems mainly consist of chillers used for refrigeration cycles and air-cooled heat pumps used for driving them. For example, in buildings with centralized cooling, a large amount of condensation heat accumulates at the condenser of the air conditioning system, especially in the condenser of air-cooled heat pumps, where the condensation heat is substantial and has great potential for recovery and utilization. When heat exchangers are used in the circulation system of air-cooled heat pumps for heat recovery, the heat from the condenser on the air-cooled heat pump is usually dissipated through the heat exchange components and the fan to heat the indoor air, thus utilizing the waste heat from the condenser. However, in this process, the heat exchange efficiency between the existing heat exchange components and the condenser is low, resulting in poor heat exchange effect. This causes the excess heat on the condenser to be lost due to insufficient heat exchange with the heat exchange components and the circulation of the heat transfer medium (such as refrigerant) and heat exchange with the air, thus resulting in heat waste.

[0003] To improve energy efficiency and achieve energy conservation, a heat exchanger and waste heat recovery system are needed that can be applied to condensers, especially condensers on air-cooled heat pumps, for heat recovery. Summary of the Invention

[0004] This invention provides a heat exchanger and a waste heat recovery system to solve the problem of poor heat exchange efficiency of heat exchange components and condensers in the prior art.

[0005] To address the aforementioned problems, according to one aspect of the present invention, a heat exchanger is provided, comprising: a first heat exchange assembly, the first heat exchange assembly including a first manifold group, the first manifold group including two spaced-apart first manifolds; a plurality of first flat tubes, the plurality of first flat tubes being arranged at intervals along the axial direction of the first manifolds, the two ends of the first flat tubes respectively communicating with the two first manifolds of the first manifold group; a second heat exchange assembly, the second heat exchange assembly including a second manifold group, the second manifold group including two spaced-apart second manifolds; and a plurality of second flat tubes, the plurality of second flat tubes being arranged at intervals along the axial direction of the first manifolds, the plurality of second flat tubes being arranged at intervals along the axial direction of the first manifolds; and a second heat exchange assembly, the second heat exchange assembly including a second manifold group, the second manifold group including two spaced-apart second manifolds; and a plurality of second flat tubes, the plurality of second flat tubes being arranged at intervals along the axial direction of the first manifolds; The second manifolds are arranged axially at intervals, and the two ends of the second flat tubes are respectively connected to the two second manifolds of the second manifold group; the second heat exchange assembly and the first heat exchange assembly are arranged side by side along the width direction of the first flat tubes; wherein, the first heat exchange assembly includes a plurality of first heat exchange fins, the first heat exchange fins are disposed between two adjacent first flat tubes and are conductively connected to at least one of the two adjacent first flat tubes; along the width direction of the first flat tubes, the first heat exchange fins extend out of the two adjacent first flat tubes, and the extended part of the first heat exchange fins is conductively connected to at least one of the two adjacent second flat tubes.

[0006] Furthermore, the second heat exchange assembly includes a plurality of second heat exchange fins, which are disposed between two adjacent second flat tubes and are conductively connected to at least one of the two adjacent second flat tubes. The extended portion of the first heat exchange fin is conductively connected to at least one of the two adjacent second flat tubes through the second heat exchange fins.

[0007] Further, the first heat exchange fin includes a first fixed fin and a first extended fin. Along the width direction of the first flat tube, the first fixed fin is flush with at least one of the two adjacent first flat tubes that are conductively connected. The first extended fin extends out of the two adjacent first flat tubes. One end of the first extended fin is conductively connected to the first fixed fin, and the other end is conductively connected to the second heat exchange fin. And / or, the second heat exchange fin includes a second fixed fin and a second extended fin. Along the width direction of the second flat tube, the second fixed fin is flush with at least one of the two adjacent second flat tubes that are conductively connected. The second extended fin extends out of the two adjacent second flat tubes. One end of the second extended fin is conductively connected to the second fixed fin, and the other end is conductively connected to the first heat exchange fin.

[0008] Furthermore, both the first fixed fin and the first extended fin are wavy fins extending in a wavy shape; the wavy fins have mutually perpendicular length, width, and height directions; in the length direction, the wavy fins have corresponding front and rear sides, in the width direction, the wavy fins have corresponding left and right sides, and in the height direction, the wavy fins have corresponding top and bottom sides; wherein, one of the front and rear sides of the first extended fin extends between the two first flat tubes, and the other side is connected to the front or rear side of the first fixed fin; the projection of the wavy fin in the plane formed by the height and width directions is wavy, and the wavy ripples extend to be flush with the length direction; the width direction of the first fixed fin and the width direction of the first extended fin form an angle.

[0009] Furthermore, the width direction of the first fixed fin is perpendicular to the width direction of the first extended fin; multiple fixed heat exchange rows are formed by taking multiple first fixed fins located between two adjacent first flat tubes as a fixed heat exchange row; the upper and lower surfaces of multiple first fixed fins located in the same fixed heat exchange row are coplanar; multiple extended heat exchange rows are formed by taking multiple first extended fins located between two adjacent first flat tubes as an extended heat exchange row; multiple first extended fins located in the same extended heat exchange row are equidistantly spaced along the extension direction of the first flat tube, and the upper and lower surfaces of multiple first extended fins are parallel; the height direction of the first extended fin is parallel to the extension direction of the first flat tube; in the length direction, the front or rear of the first extended fin is conductively connected to the second heat exchange fin.

[0010] Furthermore, the portion of the first heat exchange fin extending between two adjacent first flat tubes is positioned between two adjacent second flat tubes.

[0011] Furthermore, the first manifold and the second manifold are arranged in parallel and spaced apart; wherein, multiple first flat tubes and multiple second flat tubes are arranged side by side and spaced apart, the distance between the first flat tubes and the second flat tubes is WCP, the width of the first flat tube is W1, and 0.8W1≤WCP≤5W1 is satisfied; and / or, the first manifold and the second manifold are arranged in parallel and spaced apart; wherein, multiple first flat tubes and multiple second flat tubes are arranged side by side and spaced apart, the distance between the first flat tubes and the second flat tubes is WCP, the width of the second flat tube is W2, and 0.8W2≤WCP≤5W2 is satisfied.

[0012] Furthermore, the peripheral wall of the first manifold is provided with a plurality of first slots extending through the peripheral wall of the first manifold along the wall thickness direction. The width direction of each first slot is parallel to the axial direction of the first manifold, and the plurality of first slots are spaced apart along the axial direction of the first manifold. The distance between adjacent first slots in the axial direction of the first manifold is greater than four times the width of the first slot. And / or, the peripheral wall of the second manifold is provided with a plurality of second slots extending through the peripheral wall of the second manifold along the wall thickness direction. The width direction of each second slot is parallel to the axial direction of the second manifold, and the plurality of second slots are spaced apart along the axial direction of the second manifold. The distance between adjacent second slots in the axial direction of the second manifold is greater than four times the width of the second slot.

[0013] Furthermore, the first flat tube connects two first manifolds to form a first passage, and the second flat tube connects two second manifolds to form a second passage. The first passage and the second passage are used to circulate two liquids at different temperatures, respectively.

[0014] According to another aspect of the present invention, a waste heat recovery system is provided, including the heat exchanger described above; the waste heat recovery system further includes an air conditioning system and a heat recovery device, the air conditioning system including a compressor, an evaporator, a throttling device and a first heat exchange component; the compressor, evaporator, throttling device and the first heat exchange component are sequentially connected by pipelines to form a refrigerant circulation pipeline; wherein, the first heat exchange component serves as a condenser; the heat recovery device includes a second heat exchange component, and a first heat exchange fin on the first heat exchange component is fixedly connected to the second heat exchange component by welding; the second heat exchange component collects part of the heat dissipated by the first heat exchange component into the air and transfers it to the heat exchange medium inside the second heat exchange component.

[0015] Furthermore, the waste heat recovery system also includes a water tank, a circulating pump, and a fan. The fan drives air to flow through the heat exchanger for convective heat exchange. The water tank, the circulating pump, and the second heat exchange component are connected in sequence through pipelines to form a heat exchange medium circulation pipeline. The circulating pump is used to drive the flow of the heat exchange medium inside the heat exchange medium circulation pipeline. The heat exchange medium in the heat exchange medium circulation pipeline transports the collected heat to the water tank for storage.

[0016] Furthermore, the internal flow paths of the refrigerant circulation pipeline and the heat exchange medium circulation pipeline are arranged in reverse order.

[0017] Applying the technical solution of this invention, this invention provides a heat exchanger, comprising: a first heat exchange assembly, the first heat exchange assembly including a first manifold group, the first manifold group including two spaced-apart first manifolds; a plurality of first flat tubes, the plurality of first flat tubes being arranged at intervals along the axial direction of the first manifolds, the two ends of the first flat tubes respectively communicating with the two first manifolds of the first manifold group; a second heat exchange assembly, the second heat exchange assembly including a second manifold group, the second manifold group including two spaced-apart second manifolds; a plurality of second flat tubes, the plurality of second flat tubes being arranged at intervals along the axial direction of the first manifolds, the two ends of the first flat tubes respectively communicating with the two first manifolds of the first manifold group; and a second heat exchange assembly, the second heat exchange assembly including a second manifold group, the second manifold group including two spaced-apart second manifolds; and ... including a second manifold group, the second heat exchange assembly including a second manifold group, the second heat exchange assembly including a second manifold group, the second heat exchange assembly including a second manifold group, the second heat exchange assembly including a second manifold group, the second heat exchange assembly including a second manifold group, the second heat exchange assembly including a second manifold group, the second heat exchange The manifolds are arranged at axial intervals, and the two ends of the second flat tube are respectively connected to the two second manifolds of the second manifold group; the second heat exchange assembly and the first heat exchange assembly are arranged side by side along the width direction of the first flat tube; wherein, the first heat exchange assembly includes a plurality of first heat exchange fins, the first heat exchange fins are disposed between two adjacent first flat tubes and are conductively connected to at least one of the two adjacent first flat tubes; along the width direction of the first flat tube, the first heat exchange fins extend out of the two adjacent first flat tubes, and the extended part of the first heat exchange fins is conductively connected to at least one of the two adjacent second flat tubes.

[0018] The heat exchanger proposed in this invention, by setting a first heat exchange fin between two adjacent first flat tubes, with a portion of the first heat exchange fin extending beyond the gap between the two adjacent first flat tubes, allows the first heat exchange component and the second heat exchange component to be directly connected through the first heat exchange fin for contact heat exchange. By setting multiple first heat exchange fins spaced apart, air flowing through the gaps between the multiple first heat exchange fins can undergo convective heat exchange, thereby enabling the second heat exchanger to effectively collect dissipated heat from the air. Through the combination of the above-mentioned convective and contact heat exchange methods, the heat exchanger proposed in this invention... The heat exchanger has high heat exchange efficiency and good overall heat exchange effect, effectively meeting actual usage needs. The heat exchanger proposed in this invention can be efficiently applied to heat recovery of condensers on air-cooled heat pumps (e.g., the first heat exchange component is used as a condenser), and can be applied to hot water supply systems with waste heat recovery, thereby achieving full heat exchange of the heat dissipated by the condenser, effectively utilizing the heat of the condenser, and achieving energy saving and emission reduction. Applying the heat exchanger proposed in this invention to hot water supply systems does not require excessive use of electricity, gas, or other energy sources, which also improves the energy efficiency and environmental friendliness of the hot water supply system to a certain extent. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 A schematic diagram of the specific structure of the heat exchanger provided in Embodiment 1 of the present invention is shown;

[0021] Figure 2 A schematic diagram of the specific structure of the first heat exchange component provided in Embodiment 1 of the present invention is shown;

[0022] Figure 3 This diagram illustrates the connection between a row of first heat exchange fins and two first flat tubes according to Embodiment 1 of the present invention.

[0023] Figure 4 This diagram illustrates the cooperation between a row of first heat exchange fins and two first flat tubes according to Embodiment 2 of the present invention.

[0024] Figure 5 A schematic diagram of the specific structure of the first heat exchange component provided in Embodiment 3 of the present invention is shown;

[0025] Figure 6 A schematic diagram showing the cooperation between the fixed heat exchange column, the extended heat exchange column, and the two first flat tubes provided in Embodiment 3 of the present invention is shown.

[0026] Figure 7 A partial structural schematic diagram of the waste heat recovery system provided in an embodiment of the present invention is shown;

[0027] Figure 8 A simplified structural diagram of the first heat exchange fin provided in an embodiment of the present invention is shown.

[0028] The above figures include the following reference numerals:

[0029] 1. First heat exchange assembly; 2. Second heat exchange assembly; 3. Throttling device;

[0030] 10. First manifold;

[0031] 20. First flat tube;

[0032] 30. First heat exchange fin; 31. Front; 32. Rear; 33. Left; 34. Right; 35. Top; 36. Bottom; 37. First fixed fin; 38. First extended fin;

[0033] 41. Fixed heat exchanger column; 42. Extended heat exchanger column;

[0034] 50. Protective edge panels;

[0035] 60. Compressor;

[0036] 70. Evaporator;

[0037] 80. Condenser; 81. Second manifold; 82. Second flat tube;

[0038] 90. Water tank. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] like Figures 1 to 8 As shown, an embodiment of the present invention provides a heat exchanger, comprising: a first heat exchange assembly 1, the first heat exchange assembly 1 including a first manifold group, the first manifold group including two spaced-apart first manifolds 10; a plurality of first flat tubes 20, the plurality of first flat tubes 20 being arranged at intervals along the axial direction of the first manifolds 10, the two ends of the first flat tubes 20 being respectively connected to the two first manifolds 10 of the first manifold group; a second heat exchange assembly 2, the second heat exchange assembly 2 including a second manifold group, the second manifold group including two spaced-apart second manifolds 81; a plurality of second flat tubes 82, the plurality of second flat tubes 82 being arranged along the second manifolds 81. The first flat tube 20 is arranged axially at intervals, and the two ends of the second flat tube 82 are respectively connected to the two second manifolds 81 of the second manifold group; the second heat exchange assembly 2 and the first heat exchange assembly 1 are arranged side by side along the width direction of the first flat tube 20; wherein, the first heat exchange assembly 1 includes a plurality of first heat exchange fins 30, the first heat exchange fins 30 are disposed between two adjacent first flat tubes 20 and are conductively connected to at least one of the two adjacent first flat tubes 20; along the width direction of the first flat tube 20, the first heat exchange fins 30 extend out of the two adjacent first flat tubes 20, and the extended part of the first heat exchange fins 30 is conductively connected to at least one of the two adjacent second flat tubes 82.

[0041] The heat exchanger proposed in this invention features a first heat exchange fin 30 positioned between two adjacent first flat tubes 20, with a portion of the first heat exchange fin 30 extending beyond the gap between the two adjacent first flat tubes 20. This allows the first heat exchange component 1 and the second heat exchange component 2 to be directly connected via the first heat exchange fin (e.g., the first heat exchange component 1 can serve as a condenser 80 in an air conditioning system) for contact heat exchange. By spaced out multiple first heat exchange fins 30, air flowing through the gaps between the multiple first heat exchange fins 30 can undergo convective heat exchange, thereby enabling the heat exchanger (e.g., the second heat exchange component 2) to effectively collect heat dissipation from the air. By combining the two heat exchange methods of convection and contact heat exchange, the heat exchanger proposed in this invention has high heat exchange efficiency and good overall heat exchange effect, effectively meeting practical application needs. The heat exchanger proposed in this invention can be efficiently applied to the heat recovery of the condenser 80 on an air-cooled heat pump, and can also be applied to a waste heat recovery hot water supply system, thereby achieving full heat exchange of the heat dissipated by the condenser 80, effectively utilizing the heat of the condenser 80, and achieving energy saving and emission reduction. Applying the heat exchanger proposed in this invention to a hot water supply system does not require excessive use of electricity, gas, or other energy sources, which also improves the energy efficiency and environmental friendliness of the hot water supply system to a certain extent.

[0042] It should be noted that the "conductive connection" proposed in this invention refers to a connection method that can achieve heat conduction, such as a direct connection to achieve contact heat exchange, an intermittent connection to achieve convective heat exchange, or a radiative heat exchange. The "conductive connection" proposed in this invention includes, but is not limited to, a direct contact or welded connection between the two, or other connection methods known in the art that can achieve heat conduction. Therefore, the conductive connection between the first heat exchange fin 30 and the second flat tube 82 can be a direct connection or an intermittent connection, and the connection method can be flexibly set according to actual requirements (e.g., heat conduction efficiency requirements), which will not be elaborated here.

[0043] Specifically, the second heat exchange assembly 2 includes a plurality of second heat exchange fins. The second heat exchange fins are disposed between two adjacent second flat tubes 82 and are conductively connected to at least one of the two adjacent second flat tubes 82. The protruding portion of the first heat exchange fin 30 is conductively connected to at least one of the two adjacent second flat tubes 82 through the second heat exchange fins. This arrangement makes the second heat exchange fins easy to process, form, and subsequently weld and install.

[0044] Optionally, the first heat exchange fin 30 includes a first fixed fin 37 and a first extended fin 38. Along the width direction of the first flat tube 20, the first fixed fin 37 is flush with at least one of the two adjacent first flat tubes 20 that are conductively connected. The first extended fin 38 extends out of the two adjacent first flat tubes 20. One end of the first extended fin 38 is conductively connected to the first fixed fin 37, and the other end is conductively connected to the second heat exchange fin. And / or, the second heat exchange fin includes a second fixed fin and a second extended fin. Along the width direction of the second flat tube 82, the second fixed fin is flush with at least one of the two adjacent second flat tubes 82 that are conductively connected. The second extended fin extends out of the two adjacent second flat tubes 82. One end of the second extended fin is conductively connected to the second fixed fin, and the other end is conductively connected to the first heat exchange fin 30.

[0045] like Figure 6 and Figure 8 As shown, the first heat exchange fin 30 includes a first fixed fin 37 and a first extended fin 38. One end of the first extended fin 38 is connected to the first fixed fin 37, and the other end is connected to the second heat exchange assembly 2. Both the first fixed fin 37 and the first extended fin 38 are wavy fins that extend in a wavy shape. The wavy fins have mutually perpendicular length, width, and height directions. In the length direction, the wavy fins have corresponding front and rear faces 31 and 32, and in the width direction, the wavy fins have corresponding left faces. 33 and 34, in the height direction, the wavy fins have corresponding upper surface 35 and lower surface 36; wherein, one side of the front surface 31 and the rear surface 32 of the first protruding fin 38 extends between the two first flat tubes 20, and the other side is connected to the front surface 31 or the rear surface 32 of the first fixed fin 37. The projection of the wavy fin in the plane formed by the height direction and the width direction is corrugated and the corrugations extend to be flush with the length direction. The width direction of the first fixed fin 37 and the width direction of the first protruding fin 38 have an angle.

[0046] By setting the width direction of the first fixed fin 37 to form an angle with the width direction of the first extended fin 38, the first fixed fin 37 and the first extended fin 38 are positioned at an angle. Figure 6 The interlacing at different angles forms a convective heat transfer network, which further improves the convective heat transfer efficiency and is conducive to improving heat transfer efficiency.

[0047] In a specific embodiment of the present invention, the area of ​​the upper part 35 and the lower part 36 is not less than the area of ​​the left part 33 and the right part 34, and the area of ​​the left part 33 and the right part 34 is not less than the area of ​​the front part 31 and the rear part 32; the left part 33 and the right part 34 of the first protruding fin 38 are fixedly connected to the outer walls of two adjacent first flat tubes 20 by welding.

[0048] like Figure 6 and Figure 8 As shown, the width direction of the first fixed fin 37 is perpendicular to the width direction of the first extended fin 38; multiple fixed heat exchange rows 41 are formed by taking multiple first fixed fins 37 located between two adjacent first flat tubes 20 as a fixed heat exchange row 41; the upper surface 35 and lower surface 36 of multiple first fixed fins 37 located in the same fixed heat exchange row 41 are coplanar; multiple extended heat exchange rows 42 are formed by taking multiple first extended fins 38 located between two adjacent first flat tubes 20 as an extended heat exchange row 42; multiple first extended fins 38 located in the same extended heat exchange row 42 are equidistantly spaced along the extension direction of the first flat tube 20, and the upper surface 35 and lower surface 36 of multiple first extended fins 38 are parallel; the height direction of the first extended fin 38 is parallel to the extension direction of the first flat tube 20; in the length direction, the front surface 31 or rear surface 32 of the first extended fin 38 is conductively connected to the second heat exchange fin. This configuration maximizes the number of first fixed fins 37 and first extended fins 38 within a limited space, thereby maximizing the efficiency of convection and contact heat transfer.

[0049] Specifically, the second heat exchange assembly 2 includes a second manifold group, which includes two second manifolds 81 spaced apart; a plurality of second flat tubes 82, which are arranged at intervals along the axial direction of the second manifolds 81, with both ends of the second flat tubes 82 connected to the two second manifolds 81 of the second manifold group respectively; at least the portion of the first heat exchange fin 30 extending out between two adjacent first flat tubes 20 is disposed between two adjacent second flat tubes 82; the second heat exchange assembly 2 also includes a second heat exchange fin, which is disposed between two adjacent second flat tubes 82, and the second heat exchange fin is separate from the first extended fin 38.

[0050] By integrating the second heat exchange fin with the first extended fin 38, a reliable connection and fixation between the first heat exchange component 1 and the second heat exchange component 2 are achieved, and the second heat exchange fin and the first extended fin 38 are easy to process, form and weld for installation.

[0051] like Figure 1 As shown, the second heat exchange assembly 2 includes a second manifold group, which includes two spaced-apart second manifolds 81; and a plurality of second flat tubes 82, which are arranged at intervals along the axial direction of the second manifolds 81. The two ends of each second flat tube 82 are connected to the two second manifolds 81 of the second manifold group. A portion of the first heat exchange fin 30 extending between two adjacent first flat tubes 80 is positioned between two adjacent second flat tubes 82. This arrangement improves both the contact heat exchange efficiency and the convective heat exchange efficiency between the first heat exchange assembly 1 and the second heat exchange assembly 2.

[0052] Specifically, the first manifold 10 and the second manifold 81 are arranged in parallel and spaced apart; wherein, multiple first flat tubes 20 and multiple second flat tubes 82 are arranged side by side and spaced apart, with a distance of WCP between the first flat tubes 20 and the second flat tubes 82, and the width of the first flat tube 20 is W1, satisfying 0.8W1≤WCP≤5W1; and / or, the first manifold 10 and the second manifold 81 are arranged in parallel and spaced apart; wherein, multiple first flat tubes 20 and multiple second flat tubes 82 are arranged side by side and spaced apart, with a distance of WCP between the first flat tubes 20 and the second flat tubes 82, and the width of the second flat tube 82 is W2, satisfying 0.8W2≤WCP≤5W2. This arrangement effectively avoids heat loss and improves the overall heat exchange efficiency of the heat exchanger. The widths of the first flat tube 20 and the second flat tube 82 can be equal or unequal. When the widths of the first flat tube 20 and the second flat tube 82 can effectively adjust the heat recovery between the first heat exchange component 1 and the second heat exchange component 2, the widths of the first flat tube 20 and the second flat tube 82 are equal, which facilitates the layout of the overall structure of the heat exchanger.

[0053] It should be noted that the distance between the first flat tube 20 and the second flat tube 82 is between 5mm and 100mm. The purpose of setting the distance between the first flat tube 20 and the second flat tube 82 is to effectively avoid excessive air convection resistance between the first heat exchange component 1 and the second heat exchange component 2. A gap is required between the first flat tube 20 and the second flat tube 82. If the gap is too small, the air convection resistance will be large; if the gap is too large, the heat conduction effect will be poor. Therefore, it is necessary to find a balance by setting the distance between the first flat tube 20 and the second flat tube 82.

[0054] Optionally, the peripheral wall of the first manifold 10 is provided with a plurality of first slots extending through the peripheral wall of the first manifold 10 along the wall thickness direction. The width direction of each first slot is parallel to the axial direction of the first manifold 10, and the plurality of first slots are spaced apart along the axial direction of the first manifold 10. The distance between adjacent first slots in the axial direction of the first manifold 10 is greater than four times the width of the first slot. And / or, the peripheral wall of the second manifold 81 is provided with a plurality of second slots extending through the peripheral wall of the second manifold 81 along the wall thickness direction. The width direction of each second slot is parallel to the axial direction of the second manifold 81, and the plurality of second slots are spaced apart along the axial direction of the second manifold 81. The distance between adjacent second slots in the axial direction of the second manifold 81 is greater than four times the width of the second slot.

[0055] It should be noted that, considering ease of processing, the spacing between two slots (e.g., two first slots or two second slots) is preferably above 6.5mm to ensure the pressure resistance of the overall heat exchanger structure.

[0056] like Figure 1As shown, the first flat tube 20 connects two first manifolds 10 to form a first passage, and the second flat tube 82 connects two second manifolds 81 to form a second passage. The first passage and the second passage are used to circulate two liquids at different temperatures.

[0057] In one specific embodiment of the present invention, the projection of the first manifold 10 and the projection of the second manifold 81 overlap along the extension direction of the first flat tube 20. This arrangement, while ensuring the first manifold 10 and the second manifold 81 are spaced apart, maximizes the reduction of the distance between them. This not only increases the efficiency of radiative and convective heat transfer to a certain extent but also makes the overall structure of the heat exchanger more compact and space-saving.

[0058] In another specific embodiment of the present invention, the first heat exchange fin 30 is a corrugated fin; the corrugated fin has mutually perpendicular length, width, and height directions; the first flat tube 20 has a length dimension greater than or equal to the diameter of the first manifold 10; the second flat tube 82 has a length dimension greater than or equal to the diameter of the second manifold 81. This arrangement increases the contact area between the first flat tube 20 and the second flat tube 82 and the left and right sides of the corrugated fin, thereby increasing the contact heat exchange efficiency.

[0059] like Figure 2 and Figure 8 As shown, the first heat exchange fin 30 is fixedly connected to the condenser 80 in the external air conditioning system by brazing; the first heat exchange fin 30 is a corrugated fin; as shown... Figure 8 As shown, the wavy fins have mutually perpendicular length, width, and height directions. In the length direction, the wavy fins have corresponding front (31) and rear (32) sections; in the width direction, they have corresponding left (33) and right (34) sections; and in the height direction, they have corresponding upper (35) and lower (36) sections. The areas of the upper (35) and lower (36) sections are not less than the areas of the left (33) and right (34) sections, and the areas of the left (33) and right (34) sections are not less than the areas of the front (31) and rear (32) sections. This arrangement simplifies the structure of the first heat exchange fin 30 and facilitates welding and fixing. Simultaneously, the coordinated operation of multiple wavy fins allows for flexible airflow direction setting, ensuring effective convective heat transfer.

[0060] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, multiple heat exchange fins 30 located between two adjacent first flat tubes 20 form a heat exchange column, thus forming multiple heat exchange columns. Multiple first heat exchange fins 30 located within the same heat exchange column are equidistantly spaced along the extension direction of the first flat tubes 20, and the upper surface 35 and lower surface 36 of the multiple first heat exchange fins 30 are parallel. The left surface 33 and right surface 34 of the first heat exchange fins 30 are fixedly connected to the outer walls of two adjacent first flat tubes 20 by welding. The height direction is parallel to the extension direction of the first flat tubes 20. In the length direction, a portion of the first heat exchange fins 30 extends beyond the gap between two adjacent first flat tubes 20 for fixed connection with the second heat exchange assembly 2. This arrangement ensures both contact heat exchange and convection heat exchange effects of the first heat exchange fins 30.

[0061] It should be noted that the second heat exchange component 2 itself also has fins. In Embodiment 1 of the present invention, the cooperation between one heat exchange column and two first flat tubes 20 is as follows: Figure 3 As shown, in Embodiment 1, the fin size and arrangement direction of the first heat exchange component 1 and the second heat exchange component 2 are the same, resulting in a small wind-side drag coefficient and a better wind-side pressure drop.

[0062] It should also be noted that in Embodiment 2 of the present invention, as Figure 4 As shown, in this scheme, the fins of the first heat exchange component 1 are in the same direction as the fins of the second heat exchange component 2, but are slightly larger in size (for example, the size in the width direction is slightly larger than the size of the fins on the second heat exchange component 2). At this time, when the first heat exchange fin 30 of the first heat exchange component 1 is welded and fixed to the second flat tube 82 on the second heat exchange component 2, it will extend to the end of the second flat tube 82 on the second heat exchange component 2 (that is, in the length direction, the second flat tube 82 faces the end face of the first heat exchange fin 30). This setting ensures that the first heat exchange fin 30 of the first heat exchange component 1 and the second heat exchange component 2 have sufficient contact for heat exchange, thereby enhancing the heat exchange effect.

[0063] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, multiple first flat tubes 20 are equidistantly spaced along the axial direction of the first manifold 10, so that multiple heat exchange rows are equidistantly spaced. For two adjacent heat exchange rows, the upper surface 35 of multiple first heat exchange fins 30 in one heat exchange row is not coplanar with the upper surface 35 of multiple first heat exchange fins 30 in another heat exchange row, so as to form multiple staggered first heat exchange fins 30 along the axial direction of the first manifold 10. By setting multiple staggered first heat exchange fins 30 along the axial direction of the first manifold 10, the airflow will generate flow around (rather than advection) when passing between the multiple first heat exchange fins 30, thereby increasing the convective heat transfer effect.

[0064] Optionally, such as Figure 5 and Figure 6 As shown, at least a portion of the first heat exchange fins 30 have their width direction parallel to the extension direction of the first flat tube 20, and a portion of the first heat exchange fins 30 extends along their length into the gap between two adjacent first flat tubes 20 for fixed connection with the second heat exchange assembly 2 within the external air conditioning system. Figure 1 , Figure 2 , Figure 3 and Figure 4 The difference is that, in the heat exchanger provided in Embodiment 3 of the present invention, the arrangement direction of at least a portion of the first heat exchange fins 30 is changed, thereby changing the flow direction and effective heat exchange area of ​​the airflow when passing between the multiple first heat exchange fins 30, and maximizing the convective heat exchange effect.

[0065] It should be noted that in Embodiments 1 and 2 of the present invention, the height direction of the first heat exchange fin 30 is parallel to the extension direction of the first flat tube 20, and in Embodiment 3 of the present invention, the width direction of the first heat exchange fin 30 is parallel to the extension direction of the first flat tube 20. In actual use, the arrangement of the first heat exchange fin 30 in the above three embodiments can be flexibly combined to improve the applicability of the heat exchanger.

[0066] like Figure 5 and Figure 6 As shown, a portion of the multiple first heat exchange fins 30 located between two adjacent first flat tubes 20 form a heat exchange column. The multiple first heat exchange fins 30 in the heat exchange column are equidistantly spaced along the extension direction of the first flat tube 20, and the upper surface 35 and lower surface 36 of the multiple first heat exchange fins 30 in the heat exchange column are respectively coplanar. This arrangement ensures the heat exchange effect of the first heat exchange fins 30 in Embodiment 3.

[0067] like Figure 6 As shown, there are at least two heat exchange rows between two adjacent first flat tubes 20, and multiple heat exchange rows are arranged in parallel. This arrangement further increases the effective heat exchange area of ​​the first heat exchange fins 30.

[0068] It is worth noting that in a specific embodiment of the present invention, a heat exchange column can be formed by bending or flexing the same plate. In this case, there is a connection between two adjacent first heat exchange fins 30 in a heat exchange column, which ensures the firmness of the first heat exchange fins 30.

[0069] Specifically, the first flat tube 20 and the second flat tube 82 have internal flow channels for containing and circulating the heat exchange medium; the flow channels are connected to the first manifold 10; the equivalent diameter of the flow channels ranges from 10 to 1000 μm, so that the heat exchanger is a microchannel heat exchanger. By setting the heat exchanger as a microchannel heat exchanger, the heat exchanger can be easily miniaturized and integrated.

[0070] It should be noted that the equivalent diameter in this invention does not represent a limitation on the cross-sectional shape of the flow channel. That is, the cross-sectional shape of the flow channel can be not only circular, but also other shapes, such as rectangles. The equivalent diameter only limits the volume of liquid flowing through the flow channel per unit time. For example, when the cross-sectional shape of the flow channel is rectangular, the volume of liquid flowing through it per unit time falls within the range of the volume of liquid flowing through it per unit time when the cross-sectional shape of the flow channel is circular and the diameter of the circle is in the range of 10 to 1000 μm.

[0071] like Figure 1 , Figure 2 and Figure 5 As shown, the first flat tube 20 has a flow channel inside for containing and circulating the heat exchange medium; one first manifold 10 serves as the inlet of the heat exchange medium, and the other first manifold 10 serves as the outlet of the heat exchange medium; multiple first flat tubes 20 are arranged axially along the first manifold 10 to form a flat tube group; the heat exchanger also includes at least two protective side plates 50, wherein one protective side plate 50 is disposed on the first flat tube 20 located at one end of the flat tube group, and the other protective side plate 50 is disposed on the first flat tube 20 located at the other end of the flat tube group, so as to protect the first flat tube 20. By setting the protective side plates 50, the first flat tube 20 is effectively protected, thereby improving the operational reliability of the heat exchanger.

[0072] It is worth noting that in a specific embodiment of the present invention, the protective side plate 50 can be obtained by processing the first flat tube 20; the two first flat tubes 20 located at the outermost end of the flat tube group are set to not be connected to the first manifold 10. At this time, the two first flat tubes 20 can be regarded as two protective side plates 50, which play the role of protecting the inner first flat tube 20.

[0073] like Figure 7 As shown, the present invention also provides a waste heat recovery system, including the aforementioned heat exchanger; the waste heat recovery system further includes an air conditioning system and a heat recovery device. The air conditioning system includes a compressor 60, an evaporator 70, a throttling device 3, and a first heat exchange component 1; the compressor 60, evaporator 70, throttling device 3, and first heat exchange component 1 are sequentially connected by pipelines to form a refrigerant circulation pipeline; refrigerant flows inside the refrigerant circulation pipeline; wherein, the first heat exchange component 1 serves as a condenser 80; the heat recovery device includes a second heat exchange component 2, and the first heat exchange fins 30 on the first heat exchange component 1 are fixedly connected to the second heat exchange component 2 by welding; the second heat exchange component 2 collects part of the heat dissipated from the first heat exchange component 1 into the air and transfers it to the heat exchange medium inside the second heat exchange component 2. This configuration achieves high-efficiency heat utilization of the waste heat recovery system.

[0074] like Figure 7As shown, the waste heat recovery system also includes a water tank 90, a circulation pump, and a fan. The fan drives airflow through the heat exchanger for convective heat exchange. The water tank 90, the circulation pump, and the second heat exchange component 2 are sequentially connected by pipelines to form a heat exchange medium circulation pipeline. The circulation pump drives the flow of the heat exchange medium inside the circulation pipeline. The heat exchange medium in the circulation pipeline transports the collected heat to the water tank 90 for storage. This configuration provides structural support for the subsequent waste heat recovery system to provide hot water to users.

[0075] It should be noted that in one specific embodiment of the present invention, water flows inside the heat exchange medium circulation pipeline of the heat recovery device, that is, water is used as the heat exchange medium at this time; conventional refrigerant flows through the refrigerant circulation pipeline inside the air conditioning system.

[0076] In one specific embodiment of the present invention, the water tank 90 is covered with energy storage material or formed by processing energy storage material, thereby improving the energy-saving and heat-insulating performance of the water tank 90. ​​Energy storage material is used to store the heat of hot water; the energy storage material includes organic phase change materials, inorganic phase change materials, and mixed phase change materials that combine organic and inorganic phase change materials. The energy storage material can be flexibly selected according to the usage environment, location, and customer needs.

[0077] It should be explained in detail that: the heat pump air conditioning system uses a four-way reversing valve to change the refrigerant flow direction. The difference between this and a single-cooling air conditioning system is that the refrigerant in the heat pump air conditioning system can release heat in the condenser 80, and the heat is carried into the room by the fan to achieve the purpose of indoor heating. However, in the above process, some heat will accumulate in the condenser 80 and cannot be removed by the fan in time. The heat exchanger proposed in this invention has multiple first heat exchange fins 30 in the condenser 80, which are welded together with the second heat exchange component 2 by a brazing process, realizing the effective recovery of excess heat in the heat pump air conditioning system. The recovered heat can heat the flowing working fluid water and store it in the water tank 90. ​​Subsequently, customers can choose different usage methods according to different usage needs, such as: direct use, ordinary insulation, or combined use with an electric water heater or a gas water heater.

[0078] In a specific embodiment of the present invention, the waste heat recovery system can be divided into the following three methods based on its external hot water supply and energy storage:

[0079] A. When the waste heat recovery system is applied in places with high traffic and high hot water usage, such as shopping malls, companies, and hotels, and where the hot water usage time is the same as that of the heat pump air conditioning system, the hot water in the water tank 90 can be set to a "ready-to-use" hot water supply mode.

[0080] B. When the waste heat recovery system is used in places with few people and a large amount of hot water produced by the system, the water tank 90 can be set as a general heat preservation water storage device (i.e., water tank 90 without energy storage materials) to store hot water, and then use it when the user needs it.

[0081] C. Use a water tank 90 covered with energy storage material to store hot water, or directly use energy storage material to absorb heat for storage, so as to facilitate long-term energy storage.

[0082] All three solutions described above can be used in conjunction with electric / gas water heaters. That is, when the temperature of the hot water in the tank 90°C does not meet the user's requirements, the electric / gas water heater heats the hot water before providing it to the user. Through the above settings, the waste heat recovery system effectively meets different usage needs.

[0083] In summary, this invention provides a heat exchanger and a waste heat recovery system. The heat exchanger proposed in this invention, by setting a first heat exchange fin 30 between two adjacent first flat tubes 20, with a portion of the first heat exchange fin 30 extending beyond the gap between the two adjacent first flat tubes 20, allows the first heat exchange component 1 and the second heat exchange component 2 to be directly connected through the first heat exchange fin 30 for contact heat exchange. By setting multiple first heat exchange fins 30 spaced apart, air flowing through the gaps between the multiple first heat exchange fins 30 can undergo convective heat exchange, thereby enabling the second heat exchange component 2 to effectively collect the dissipated heat from the air. The combination of convection and contact heat exchange methods results in high heat exchange efficiency and good overall heat exchange effect of the heat exchanger proposed in this invention, effectively meeting practical application needs. The heat exchanger proposed in this invention can be efficiently applied to heat recovery of the condenser 80 in an air-cooled heat pump and can be used in a waste heat recovery hot water supply system, thereby achieving full heat exchange of the heat dissipated by the condenser 80, effectively utilizing the heat of the condenser 80, and achieving energy saving and emission reduction. Applying the heat exchanger proposed in this invention to a hot water supply system reduces the need for excessive use of electricity, gas, and other energy sources, thus improving the energy efficiency and environmental friendliness of the hot water supply system to a certain extent. It should be noted that the terminology used herein is for describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0084] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0085] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0086] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0087] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat exchanger, characterized in that, include: The first heat exchange component (1) includes a first manifold group, which includes two spaced-apart first manifolds (10); and a plurality of first flat tubes (20), which are spaced-apart along the axial direction of the first manifolds (10), with the two ends of the first flat tubes (20) respectively connected to the two first manifolds (10) of the first manifold group. The second heat exchange assembly (2) includes a second manifold group, which includes two spaced-apart second manifolds (81); a plurality of second flat tubes (82), which are arranged at intervals along the axial direction of the second manifolds (81), and the two ends of the second flat tubes (82) are respectively connected to the two second manifolds (81) of the second manifold group; the second heat exchange assembly (2) and the first heat exchange assembly (1) are arranged side by side along the width direction of the first flat tube (20); The first heat exchange assembly (1) includes a plurality of first heat exchange fins (30), the first heat exchange fins (30) are disposed between two adjacent first flat tubes (20) and are conductively connected to at least one of the two adjacent first flat tubes (20); along the width direction of the first flat tubes (20), the first heat exchange fins (30) extend out of the two adjacent first flat tubes (20), and the extended portion of the first heat exchange fins (30) is conductively connected to at least one of the two adjacent second flat tubes (82).

2. The heat exchanger according to claim 1, characterized in that, The second heat exchange assembly (2) includes a plurality of second heat exchange fins, which are disposed between two adjacent second flat tubes (82) and are conductively connected to at least one of the two adjacent second flat tubes (82). The extended portion of the first heat exchange fin (30) is conductively connected to at least one of the two adjacent second flat tubes (82) through the second heat exchange fins.

3. The heat exchanger according to claim 2, characterized in that, The first heat exchange fin (30) includes a first fixed fin (37) and a first extended fin (38). Along the width direction of the first flat tube (20), the first fixed fin (37) is flush with at least one of the two adjacent first flat tubes (20) that are conductively connected. The first extended fin (38) extends out of the two adjacent first flat tubes (20). One end of the first extended fin (38) is conductively connected to the first fixed fin (37), and the other end is conductively connected to the second heat exchange fin. And / or, the second heat exchange fin includes a second fixed fin and a second extended fin. Along the width direction of the second flat tube (82), the second fixed fin is flush with at least one of the two adjacent second flat tubes (82) that are conductively connected. The second extended fin extends out of the two adjacent second flat tubes (82). One end of the second extended fin is conductively connected to the second fixed fin, and the other end is conductively connected to the first heat exchange fin (30).

4. The heat exchanger according to claim 3, characterized in that, Both the first fixed fin (37) and the first extended fin (38) are wavy fins that extend in a wavy shape. The wavy fins have mutually perpendicular length, width, and height directions. In the length direction, the wavy fins have corresponding front (31) and rear (32). In the width direction, the wavy fins have corresponding left (33) and right (34). In the height direction, the wavy fins have corresponding upper (35) and lower (36). In the first extended fin (38), one side of the front (31) and rear (32) extends between the two first flat tubes (20), and the other side is connected to the front (31) or rear (32) of the first fixed fin (37). The projection of the wavy fin in the plane formed by the height direction and the width direction is wavy, and the wavy shape extends to be flush with the length direction. The width direction of the first fixed fin (37) and the width direction of the first extended fin (38) have an angle.

5. The heat exchanger according to claim 4, characterized in that, The width direction of the first fixed fin (37) is perpendicular to the width direction of the first extended fin (38); Multiple fixed heat exchange columns (41) are formed by taking multiple first fixed fins (37) located between two adjacent first flat tubes (20) as a fixed heat exchange column (41); the upper (35) and lower (36) of multiple first fixed fins (37) located in the same fixed heat exchange column (41) are coplanar. Multiple first protruding fins (38) located between two adjacent first flat tubes (20) form a single protruding heat exchange column (42), thereby forming multiple protruding heat exchange columns (42). Multiple first protruding fins (38) located in the same protruding heat exchange column (42) are equidistantly spaced along the extension direction of the first flat tube (20), and the upper (35) and lower (36) surfaces of the multiple first protruding fins (38) are parallel to each other. The height direction of the first protruding fins (38) is parallel to the extension direction of the first flat tube (20). In the length direction, the front (31) or rear (32) surface of the first protruding fins (38) is conductively connected to the second heat exchange fins.

6. The heat exchanger according to claim 1, characterized in that, The portion of the first heat exchange fin (30) extending between two adjacent first flat tubes (20) is disposed between two adjacent second flat tubes (82).

7. The heat exchanger according to any one of claims 1 to 5, characterized in that, The first manifold (10) and the second manifold (81) are arranged in parallel and spaced apart; wherein, a plurality of first flat tubes (20) and a plurality of second flat tubes (82) are arranged side by side and spaced apart, the distance between the first flat tube (20) and the second flat tube (82) is WCP, the width of the first flat tube (20) is W1, and satisfies 0.8W1≤WCP≤5W1; and / or, the first manifold (10) and the second manifold (81) are arranged in parallel and spaced apart; wherein, a plurality of first flat tubes (20) and a plurality of second flat tubes (82) are arranged side by side and spaced apart, the distance between the first flat tube (20) and the second flat tube (82) is WCP, the width of the second flat tube (82) is W2, and satisfies 0.8W2≤WCP≤5W2.

8. The heat exchanger according to any one of claims 1 to 5, characterized in that, The peripheral wall of the first manifold (10) is provided with a plurality of first slots that penetrate the peripheral wall of the first manifold (10) along the wall thickness direction. The width direction of each first slot is parallel to the axial direction of the first manifold (10), and the plurality of first slots are spaced apart along the axial direction of the first manifold (10). The distance between adjacent first slots in the axial direction of the first manifold (10) is greater than four times the width of the first slot. And / or, the peripheral wall of the second manifold (81) is provided with a plurality of second slots that penetrate the peripheral wall of the second manifold (81) along the wall thickness direction. The width direction of each second slot is parallel to the axial direction of the second manifold (81), and the plurality of second slots are spaced apart along the axial direction of the second manifold (81). The distance between adjacent second slots in the axial direction of the second manifold (81) is greater than four times the width of the second slot.

9. The heat exchanger according to any one of claims 1 to 5, characterized in that, The first flat tube (20) connects two first manifolds (10) to form a first passage, and the second flat tube (82) connects two second manifolds (81) to form a second passage. The first passage and the second passage are used to circulate two liquids at different temperatures.

10. A waste heat recovery system, characterized in that, The system includes the heat exchanger as described in any one of claims 1 to 9; the waste heat recovery system further includes an air conditioning system and a heat recovery device, the air conditioning system includes a compressor (60), an evaporator (70), a throttling device (3) and the first heat exchange component (1); the compressor (60), the evaporator (70), the throttling device (3) and the first heat exchange component (1) are connected in sequence by pipelines to form a refrigerant circulation pipeline; wherein, the first heat exchange component (1) serves as a condenser (80); the heat recovery device includes a second heat exchange component (2), the first heat exchange fins (30) on the first heat exchange component (1) are fixedly connected to the second heat exchange component (2) by welding; the second heat exchange component (2) collects part of the heat dissipated in the air by the first heat exchange component (1) and transfers it to the heat exchange medium in the second heat exchange component (2).

11. The waste heat recovery system according to claim 10, characterized in that, The waste heat recovery system also includes a water tank (90), a circulation pump and a fan. The fan drives air to flow through the heat exchanger for convective heat exchange. The water tank (90), the circulation pump and the second heat exchange component (2) are connected in sequence through pipelines to form a heat exchange medium circulation pipeline. The circulation pump is used to drive the heat exchange medium inside the heat exchange medium circulation pipeline to flow. The heat exchange medium in the heat exchange medium circulation pipeline transports the collected heat to the water tank (90) for storage.

12. The waste heat recovery system according to claim 11, characterized in that, The internal flow paths of the refrigerant circulation pipeline and the heat exchange medium circulation pipeline are arranged in reverse order.

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