Heat exchanger and waste heat recovery system

Abstract

The utility model provides a heat exchanger and a waste heat recovery system, the heat exchanger comprises a first heat exchange assembly, a second heat exchange assembly, a third heat exchange assembly and a fourth heat exchange assembly, the first heat exchange assembly comprises a first collecting pipe group, and the first collecting pipe group comprises two first collecting pipes; 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 provided by the utility model can be efficiently applied to heat recovery of a condenser on an air-cooled heat pump, and can be applied to a hot water supply system for waste heat recovery, so that the heat of the condenser is effectively utilized, and the effects of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery equipment, and in particular to a heat exchanger and a waste heat recovery system. Background Art

[0002] At present, the existing waste heat recovery system for air-conditioning system is widely used in buildings with stable hot water demand due to its significant energy-saving effect; the existing air-conditioning system mainly includes a chiller for refrigeration cycle and an air-cooled heat pump for driving; for example, in a building with centralized cooling, a large amount of condensation heat will accumulate at the condenser of the air-conditioning system, especially the condenser on the air-cooled heat pump, which has a large amount of condensation heat and has great potential for recycling; when the heat exchanger is used in the circulation system of the air-cooled heat pump for heat recovery, the heat of the condenser on the air-cooled heat pump is usually discharged by the heat exchange component and the heat dissipation of the fan, so as to heat the indoor air and complete the utilization of the waste heat of the condenser, but in this process, the heat exchange efficiency between the existing heat exchange component and the condenser is low, and the heat exchange effect is poor, resulting in the excess heat on the condenser not having enough time to fully exchange heat with the heat exchange component and then being lost with the circulation of the heat transfer medium (such as refrigerant) and heat exchange with the air, thereby causing heat waste.

[0003] In order to improve energy utilization and achieve energy saving, a heat exchanger and waste heat recovery system that can be applied to a condenser, especially a condenser on an air-cooled heat pump, for heat recovery is needed. Utility Model Content

[0004] The utility model provides a heat exchanger and a waste heat recovery system to solve the problem of poor heat exchange efficiency between a heat exchange component and a condenser in the prior art.

[0005] In order to solve the above problems, according to one aspect of the utility model, a heat exchanger is provided, comprising: a first heat exchange component, the first heat exchange component comprises a first header group, the first header group comprises two first headers arranged at intervals; a plurality of first flat tubes, the plurality of first flat tubes are arranged at intervals along the axial direction of the first header, and the two ends of the first flat tubes are respectively connected to the two first headers of the first header group; a second heat exchange component, the second heat exchange component comprises a second header group, the second header group comprises two second headers arranged at intervals; a plurality of second flat tubes, the plurality of second flat tubes The second flat tubes are arranged at intervals along the axial direction of the second collecting tube, and the two ends of the second flat tubes are respectively connected to the two second collecting tubes of the second collecting tube group; the second heat exchange component and the first heat exchange component are arranged in parallel along the width direction of the first flat tube; wherein the first heat exchange component includes a plurality of first heat exchange fins, the first heat exchange fins are arranged 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.

[0006] Furthermore, the second heat exchange assembly includes a plurality of second heat exchange fins, which are arranged between two adjacent second flat tubes and are conductively connected to at least one of the two adjacent second flat tubes, and 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 extending fin, and along the width direction of the first flat tube, the first fixed fin is arranged flush with at least one of the two adjacent first flat tubes connected by conduction, and the first extending fin is arranged to extend from the two adjacent first flat tubes, one end of the first extending 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 extending fin, and along the width direction of the second flat tube, the second fixed fin is arranged flush with at least one of the two adjacent second flat tubes connected by conduction, and the second extending fin is arranged to extend from the two adjacent second flat tubes, one end of the second extending fin is conductively connected to the second fixed fin, and the other end is conductively connected to the first heat exchange fin.

[0008] Furthermore, the first fixed fin and the first extending fin are both wavy fins extending in a wave shape; the wavy fin has a length direction, a width direction and a height direction that are perpendicular to each other; in the length direction, the wavy fin has a corresponding front and back side, in the width direction, the wavy fin has a corresponding left side and right side, and in the height direction, the wavy fin has a corresponding top and bottom side; wherein, one of the front and back sides of the first extending fin extends out between the two first flat tubes, and the other side is connected to the front or back side of the first fixed fin, and the projection of the wavy fin in the plane formed by the height direction and the width direction is corrugated and the corrugations of the corrugation extend to be flush with the length direction, and the width direction of the first fixed fin has an angle with the width direction of the first extending fin.

[0009] Furthermore, the width direction of the first fixed fin is perpendicular to the width direction of the first extending fin; a plurality of first fixed fins located between two adjacent first flat tubes are used as a fixed heat exchange column to form a plurality of fixed heat exchange columns; the top and bottom surfaces of a plurality of first fixed fins located in the same fixed heat exchange column are respectively coplanar; a plurality of first extending fins located between two adjacent first flat tubes are used as an extending heat exchange column to form a plurality of extending heat exchange columns; a plurality of first extending fins located in the same extending heat exchange column are equidistantly spaced along the extension direction of the first flat tube, and the top and bottom surfaces of the plurality of first extending fins are respectively parallel; the height direction of the first extending fin is parallel to the extension direction of the first flat tube; in the length direction, the front or rear surface of the first extending fin is conductively connected to the second heat exchange fin.

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

[0011] Further, the first collecting tube and the second collecting tube are arranged in parallel and spaced apart; wherein, a plurality of first flat tubes and a plurality of second flat tubes are arranged side by side and spaced apart in one-to-one correspondence, the spacing between the first flat tubes and the second flat tubes is WCP, the width of the first flat tubes is W1, and 0.8W1≤WCP≤5W1 is satisfied; and / or, the first collecting tube and the second collecting tube are arranged in parallel and spaced apart; wherein, a plurality of first flat tubes and a plurality of second flat tubes are arranged side by side and spaced apart in one-to-one correspondence, the spacing between the first flat tubes and the second flat tubes is WCP, the width of the second flat tubes is W2, and 0.8W2≤WCP≤5W2 is satisfied.

[0012] Further, a plurality of first slots are provided on the circumferential wall of the first collecting tube and penetrate the circumferential wall of the first collecting tube along the wall thickness direction of the first collecting tube, the width direction of each first slot is parallel to the axial direction of the first collecting tube and the plurality of first slots are spaced apart along the axial direction of the first collecting tube, and the distance between adjacent first slots in the axial direction of the first collecting tube is greater than four times the width of the first slots; and / or a plurality of second slots are provided on the circumferential wall of the second collecting tube and penetrate the circumferential wall of the second collecting tube along the wall thickness direction of the second collecting tube, the width direction of each second slot is parallel to the axial direction of the second collecting tube and the plurality of second slots are spaced apart along the axial direction of the second collecting tube, and the distance between adjacent second slots in the axial direction of the second collecting tube is greater than four times the width of the second slots.

[0013] Furthermore, the first flat tube is connected to the two first headers to form a first passage, and the second flat tube is connected to the two second headers to form a second passage. The first passage and the second passage are respectively used to circulate liquids of two different temperatures.

[0014] According to another aspect of the utility model, a waste heat recovery system is provided, comprising the above-mentioned heat exchanger; the waste heat recovery system also comprises an air-conditioning system and a heat recovery device, the air-conditioning system comprises a compressor, an evaporator, a throttling device and a first heat exchange component; the compressor, the evaporator, the throttling device and the first heat exchange component are connected in sequence through pipelines to form a refrigerant circulation pipeline; wherein the first heat exchange component serves as a condenser; the heat recovery device comprises a second heat exchange component, and the 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 in the air, and transmits it to the heat exchange medium in the second heat exchange component.

[0015] Furthermore, the waste heat recovery system also includes a water tank, a circulation pump and a fan, the fan drives air to flow through the heat exchanger for convective heat exchange; the water tank, the circulation pump and the second heat exchange component are connected in sequence through pipelines to form a heat exchange medium circulation pipeline, and the circulation pump is used to drive the flow of heat exchange medium inside the heat exchange medium circulation pipeline; wherein 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] The utility model uses the technical solution of the utility model, and provides a heat exchanger, including: a first heat exchange component, the first heat exchange component includes a first header group, the first header group includes two first headers arranged at intervals; a plurality of first flat tubes, the plurality of first flat tubes are arranged at intervals along the axial direction of the first header, and the two ends of the first flat tubes are respectively connected to the two first headers of the first header group; a second heat exchange component, the second heat exchange component includes a second header group, the second header group includes two second headers arranged at intervals; a plurality of second flat tubes, the plurality of second flat tubes are arranged along the axial direction of the first header. The second collecting tubes are arranged in axial intervals, and the two ends of the second flat tubes are respectively connected to the two second collecting tubes of the second collecting tube group; the second heat exchange component and the first heat exchange component are arranged in parallel along the width direction of the first flat tube; wherein the first heat exchange component includes a plurality of first heat exchange fins, the first heat exchange fins are arranged 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 the utility model is provided with a first heat exchange fin between two adjacent first flat tubes, and a part of the first heat exchange fin extends out of the gap between the two adjacent first flat tubes, so that the first heat exchange component in the heat exchanger can be directly connected to the second heat exchange component through the first heat exchange fin to perform contact heat exchange; by arranging a plurality of first heat exchange fins at intervals, air flows through the gaps between the plurality of first heat exchange fins, and can perform convective heat exchange, so that the second heat exchanger can effectively collect the diffused heat in the air; through the cooperation of the above-mentioned convective heat exchange and contact heat exchange, the heat exchanger proposed in the utility model is The heat exchange efficiency of the heat exchanger is high, the overall heat exchange effect is good, and the actual use needs are effectively met; the heat exchanger proposed in the utility model can be efficiently applied to the heat recovery of the condenser on the air-cooled heat pump (for example: the first heat exchange component is used as the condenser), and the heat exchanger can be applied to the hot water supply system for waste heat recovery, thereby realizing full heat exchange of the heat dissipated by the condenser, effectively utilizing the heat of the condenser, and achieving the effect of energy saving and emission reduction; the heat exchanger proposed in the utility model is applied to the hot water supply system, without using too much electricity, gas and other energy sources, and to a certain extent, it also improves the energy saving and environmental protection of the hot water supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1The specific structural schematic diagram of the heat exchanger provided in the first embodiment of the utility model is shown;

[0021] Figure 2 The specific structural schematic diagram of the first heat exchange component provided in the first embodiment of the utility model is shown;

[0022] Figure 3 A schematic diagram showing the cooperation between a row of first heat exchange fins and two first flat tubes provided in the first embodiment of the utility model is shown;

[0023] Figure 4 A schematic diagram showing the coordination of a row of first heat exchange fins and two first flat tubes provided in the second embodiment of the utility model is shown;

[0024] Figure 5 The specific structural schematic diagram of the first heat exchange component provided in the third embodiment of the present utility model is shown;

[0025] Figure 6 The figure shows the coordination diagram of the fixed heat exchange column, the extended heat exchange column and the two first flat tubes provided in the third embodiment of the present utility model;

[0026] Figure 7 A partial structural schematic diagram of a waste heat recovery system provided by an embodiment of the utility model is shown;

[0027] Figure 8 A simplified structural diagram is shown when the first heat exchange fin provided in an embodiment of the utility model is a corrugated fin.

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

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

[0030] 10. The first header;

[0031] 20. The 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 exchange column; 42. Extended heat exchange column;

[0034] 50. Protective side panels;

[0035] 60. Compressor;

[0036] 70. Evaporator;

[0037] 80. condenser; 81. second header; 82. second flat tube;

[0038] 90. Water tank. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0040] like Figures 1 to 8 As shown, an embodiment of the utility model provides a heat exchanger, comprising: a first heat exchange component 1, the first heat exchange component 1 comprises a first header group, the first header group comprises two first headers 10 arranged at intervals; a plurality of first flat tubes 20, the plurality of first flat tubes 20 are arranged along the axial direction of the first header 10 at intervals, and the two ends of the first flat tubes 20 are respectively connected to the two first headers 10 of the first header group; a second heat exchange component 2, the second heat exchange component 2 comprises a second header group, the second header group comprises two second headers 81 arranged at intervals; a plurality of second flat tubes 82, the plurality of second flat tubes 82 are arranged along the second header 8 1, the two ends of the second flat tube 82 are respectively connected to the two second headers 81 of the second header group; the second heat exchange assembly 2 and the first heat exchange assembly 1 are arranged in parallel along the width direction of the first flat tube 20; wherein the first heat exchange assembly 1 comprises a plurality of first heat exchange fins 30, the first heat exchange fins 30 are arranged 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 portion 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 by the utility model is provided with a first heat exchange fin 30 disposed between two adjacent first flat tubes 20, and a part of the first heat exchange fin 30 extends out of the gap between the two adjacent first flat tubes 20, so that the first heat exchange component 1 in the heat exchanger can be directly connected to the second heat exchange component 2 through the first heat exchange fin (for example, the first heat exchange component 1 can be used as a condenser 80 in an air-conditioning system) to perform contact heat exchange; by arranging a plurality of first heat exchange fins 30 at intervals, air flows through the gaps between the plurality of first heat exchange fins 30, and convection heat exchange can be performed, so that the heat exchanger (for example, the second heat exchange component 2) can effectively collect the diffused heat in the air; Through the coordination of the above-mentioned convection heat exchange and contact heat exchange, the heat exchange efficiency of the heat exchanger proposed in the utility model is high, the overall heat exchange effect is good, and the actual use needs are effectively met; the heat exchanger proposed in the utility model can be efficiently applied to the heat recovery of the condenser 80 on the air-cooled heat pump, and the heat exchanger can be applied to the hot water supply system of waste heat recovery, thereby realizing the full heat exchange of the heat dissipated by the condenser 80, effectively utilizing the heat of the condenser 80, and achieving the effect of energy saving and emission reduction; the heat exchanger proposed in the utility model is applied to the hot water supply system, without using too much electricity, gas and other energy sources, which also improves the energy saving and environmental protection of the hot water supply system to a certain extent.

[0042] It should be noted that the "conduction connection" proposed in the present invention refers to a connection method that can achieve heat conduction, such as direct connection to achieve contact heat exchange, interval setting to achieve convection heat exchange or radiation heat exchange; the "conduction connection" proposed in the present invention includes but is not limited to direct abutment or welding fixed connection between the two, or other connection methods known in the art that can achieve heat conduction; therefore, the conduction connection between the first heat exchange fin 30 and the second flat tube 82 can be a direct connection or an interval setting, and the connection method can be flexibly set according to actual requirements (for example: heat conduction efficiency requirements), which will not be repeated here.

[0043] Specifically, 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, and 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. This arrangement makes it easier for the second heat exchange fins to be processed and subsequently welded and installed.

[0044] Optionally, the first heat exchange fin 30 includes a first fixed fin 37 and a first extending fin 38, and along the width direction of the first flat tube 20, the first fixed fin 37 is arranged flush with at least one of the two adjacent first flat tubes 20 that are conductively connected, and the first extending fin 38 is arranged to extend from the two adjacent first flat tubes 20, one end of the first extending 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 extending fin, and along the width direction of the second flat tube 82, the second fixed fin is arranged flush with at least one of the two adjacent second flat tubes 82 that are conductively connected, and the second extending fin is arranged to extend from the two adjacent second flat tubes 82, one end of the second extending 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, the first fixed fin 37 and the first extended fin 38 are both wavy fins extending in a wave shape; the wavy fin has a length direction, a width direction and a height direction perpendicular to each other; in the length direction, the wavy fin has a corresponding front 31 and a rear 32, and in the width direction, the wavy fin has a corresponding left 33 and right side 34, in the height direction, the wavy fin has a corresponding upper side 35 and lower side 36; wherein, one side of the front side 31 and the rear side 32 of the first extending fin 38 extends out between the two first flat tubes 20, and the other side is connected to the front side 31 or the rear side 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 of the corrugation extend to be flush with the length direction, and the width direction of the first fixed fin 37 and the width direction of the first extending fin 38 have an angle.

[0046] By setting the width direction of the first fixed fin 37 and the width direction of the first extending fin 38 to have an included angle, the first fixed fin 37 and the first extending fin 38 are Figure 6 The angles are interwoven to form a convective heat transfer network, which further improves the convective heat transfer efficiency and is beneficial to improving the heat transfer efficiency.

[0047] In a specific embodiment of the present invention, the area of ​​the upper surface 35 and the lower surface 36 is not less than the area of ​​the left surface 33 and the right surface 34, and the area of ​​the left surface 33 and the right surface 34 is not less than the area of ​​the front surface 31 and the rear surface 32; the left surface 33 and the right surface 34 of the first extending fin 38 are fixedly connected to the outer walls of the 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 extending fin 38; a plurality of first fixed fins 37 located between two adjacent first flat tubes 20 are formed as a fixed heat exchange row 41, forming a plurality of fixed heat exchange rows 41; the upper surfaces 35 and the lower surfaces 36 of the plurality of first fixed fins 37 located in the same fixed heat exchange row 41 are respectively coplanar; a plurality of first extending fins 38 located between two adjacent first flat tubes 20 are formed as an extending heat exchange row 42, forming a plurality of extending heat exchange rows 42; the plurality of first extending fins 38 located in the same extending heat exchange row 42 are equidistantly spaced along the extension direction of the first flat tube 20, and the upper surfaces 35 and the lower surfaces 36 of the plurality of first extending fins 38 are respectively parallel; the height direction of the first extending fins 38 is parallel to the extension direction of the first flat tube 20; in the length direction, the front surface 31 or the rear surface 32 of the first extending fin 38 is conductively connected to the second heat exchange fin. In this way, as many first fixed fins 37 and first extending fins 38 as possible are arranged within a limited space, thereby maximizing the efficiency of convection and contact heat exchange.

[0049] Specifically, the second heat exchange component 2 includes a second header group, which includes two second headers 81 that are spaced apart; a plurality of second flat tubes 82, which are spaced apart along the axial direction of the second header 81, and the two ends of the second flat tubes 82 are respectively connected to the two second headers 81 of the second header group, and at least the portion of the first heat exchange fin 30 extending between two adjacent first flat tubes 20 is arranged between two adjacent second flat tubes 82; the second heat exchange component 2 also includes a second heat exchange fin, which is arranged between two adjacent second flat tubes 82, and the second heat exchange fin and the first extending fin 38 are separately arranged.

[0050] By arranging the second heat exchange fins and the first extending fins 38 as a whole, 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 fins and the first extending fins 38 are easy to process, shape, weld and install.

[0051] like Figure 1 As shown, the second heat exchange assembly 2 includes a second header group, which includes two second headers 81 arranged at intervals; a plurality of second flat tubes 82, which are arranged at intervals along the axial direction of the second header 81, and the two ends of the second flat tubes 82 are respectively connected to the two second headers 81 of the second header group, and the portion of the first heat exchange fin 30 extending between two adjacent first flat tubes 20 is arranged between two adjacent second flat tubes 82. This arrangement improves the contact heat exchange efficiency and convection heat exchange efficiency between the first heat exchange assembly 1 and the second heat exchange assembly 2.

[0052] Specifically, the first header 10 and the second header 81 are arranged in parallel and at intervals; wherein, a plurality of first flat tubes 20 and a plurality of second flat tubes 82 are arranged side by side and at intervals in one-to-one correspondence, the spacing between the first flat tubes 20 and the second flat tubes 82 is WCP, the width of the first flat tubes 20 is W1, and 0.8W1≤WCP≤5W1 is satisfied; and / or, the first header 10 and the second header 81 are arranged in parallel and at intervals; wherein, a plurality of first flat tubes 20 and a plurality of second flat tubes 82 are arranged side by side and at intervals in one-to-one correspondence, the spacing between the first flat tubes 20 and the second flat tubes 82 is WCP, the width of the second flat tubes 82 is W2, and 0.8W2≤WCP≤5W2 is satisfied. Such an arrangement can effectively avoid heat loss and improve 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 amount 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 spacing between the first flat tube 20 and the second flat tube 82 is between 5 mm and 100 mm. The spacing between the first flat tube 20 and the second flat tube 82 is set to effectively avoid excessive resistance to air convection between the first heat exchange component 1 and the second heat exchange component 2. There needs to be a gap between the first flat tube 20 and the second flat tube 82. If the gap is too small, the air convection resistance is large. If the gap is too large, the heat conduction effect is poor. Therefore, it is necessary to find a balance by setting the spacing between the first flat tube 20 and the second flat tube 82.

[0054] Optionally, a plurality of first slots are provided on the circumferential wall of the first collecting tube 10 and pass through the circumferential wall of the first collecting tube 10 along the wall thickness direction of the first collecting tube 10, the width direction of each first slot is parallel to the axial direction of the first collecting tube 10 and the plurality of first slots are spaced apart along the axial direction of the first collecting tube 10, and the distance between adjacent first slots in the axial direction of the first collecting tube 10 is greater than four times the width of the first slot; and / or, a plurality of second slots are provided on the circumferential wall of the second collecting tube 81 and pass through the circumferential wall of the second collecting tube 81 along the wall thickness direction of the second collecting tube 81, the width direction of each second slot is parallel to the axial direction of the second collecting tube 81 and the plurality of second slots are spaced apart along the axial direction of the second collecting tube 81, and the distance between adjacent second slots in the axial direction of the second collecting tube 81 is greater than four times the width of the second slot.

[0055] It should be noted that: considering the convenience of processing, the distance between two slots (such as two first slots or two second slots) is preferably greater than 6.5 mm to ensure the pressure resistance of the overall structure of the heat exchanger.

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

[0057] In a specific embodiment of the present invention, the projection of the first header 10 and the projection of the second header 81 overlap along the extension direction of the first flat tube 20. In this way, under the premise that the first header 10 and the second header 81 are arranged at intervals, the distance between the first header 10 and the second header 81 is minimized, which not only increases the efficiency of radiation heat exchange and convection heat exchange to a certain extent, but also makes the overall structure of the heat exchanger compact and saves more space.

[0058] In another specific embodiment of the utility model, the first heat exchange fin 30 is a corrugated fin; the corrugated fin has a length direction, a width direction and a height direction that are perpendicular to each other; the length direction of the first flat tube 20 is greater than or equal to the diameter of the first header 10; the length direction of the second flat tube 82 is greater than or equal to the diameter of the second header 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 wavy fin; Figure 8 As shown, the wavy fin has mutually perpendicular length direction, width direction and height direction; in the length direction, the wavy fin has a corresponding front 31 and rear 32, in the width direction, the wavy fin has a corresponding left 33 and right 34, in the height direction, the wavy fin has a corresponding top 35 and bottom 36; wherein, the area of ​​the top 35 and bottom 36 is not less than the area of ​​the left 33 and right 34, and the area of ​​the left 33 and right 34 is not less than the area of ​​the front 31 and rear 32. This arrangement ensures that the structure of the first heat exchange fin 30 is simplified and is easy to weld and fix; at the same time, the cooperation of multiple wavy fins allows the flow direction of the airflow to be flexibly set, ensuring the effect of convective heat exchange.

[0060] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a plurality of first heat exchange fins 30 located between two adjacent first flat tubes 20 are used as a heat exchange column to form a plurality of heat exchange columns; the plurality of first heat exchange fins 30 located in the same heat exchange column are arranged at equal intervals along the extension direction of the first flat tube 20, and the upper surfaces 35 and lower surfaces 36 of the plurality of first heat exchange fins 30 are respectively parallel; the left surface 33 and the right surface 34 of the first heat exchange fin 30 are respectively fixedly connected to the outer walls of the two adjacent first flat tubes 20 by welding; the height direction is parallel to the extension direction of the first flat tube 20; in the length direction, a portion of the first heat exchange fin 30 extends out of the gap between the two adjacent first flat tubes 20 along the length direction, so as to be fixedly connected to the second heat exchange assembly 2. This arrangement ensures the contact heat exchange and convection heat exchange effects of the first heat exchange fin 30.

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

[0062] It should be noted that: in the second embodiment of the present invention, Figure 4 As shown, in this scheme, the fins of the first heat exchange component 1 have the same direction as the fins of the second heat exchange component 2 itself, 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 arrangement ensures that the first heat exchange fin 30 of the first heat exchange component 1 and the second heat exchange component 2 are in sufficient contact and heat exchange, thereby enhancing the heat exchange effect.

[0063] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a plurality of first flat tubes 20 are arranged at equal intervals along the axial direction of the first header 10, so that a plurality of heat exchange columns are arranged at equal intervals; for two adjacent heat exchange columns, the upper surfaces 35 of the plurality of first heat exchange fins 30 in one heat exchange column are not coplanar with the upper surfaces 35 of the plurality of first heat exchange fins 30 in the other heat exchange column, so as to form a plurality of first heat exchange fins 30 staggered in the axial direction of the first header 10. By forming a plurality of first heat exchange fins 30 staggered in the axial direction of the first header 10, a circumferential flow (rather than advection) is generated when the airflow passes between the plurality of first heat exchange fins 30, thereby increasing the convective heat exchange effect.

[0064] Alternatively, if Figure 5 and Figure 6 As shown, at least a portion of the first heat exchange fins 30 is parallel to the extension direction of the first flat tubes 20 in the width direction, and a portion of the first heat exchange fins 30 extends out of the gap between two adjacent first flat tubes 20 along the length direction, so as to be fixedly connected to the second heat exchange assembly 2 in the external air conditioning system. Figure 1 , Figure 2 , Figure 3 and Figure 4 What is different is that, in the heat exchanger provided in the third embodiment of the utility model, the setting direction of at least a part of the first heat exchange fins 30 is changed, thereby changing the flow direction and effective heat exchange area of ​​the airflow when passing through the plurality of first heat exchange fins 30, thereby maximizing the convective heat exchange effect.

[0065] It should be noted that: in the first and second embodiments 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 the third embodiment 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 mixed and matched to improve the applicability of the heat exchanger.

[0066] like Figure 5 and Figure 6 As shown, a portion of the first heat exchange fins 30 among the plurality of first heat exchange fins 30 located between two adjacent first flat tubes 20 form a heat exchange row, and the plurality of first heat exchange fins 30 in the heat exchange row are arranged at equal intervals along the extension direction of the first flat tubes 20, and the upper surfaces 35 and lower surfaces 36 of the plurality of first heat exchange fins 30 in the heat exchange row are arranged in the same plane. This arrangement ensures the heat exchange effect of the first heat exchange fins 30 in the third embodiment.

[0067] like Figure 6 As shown, there are at least two heat exchange rows between two adjacent first flat tubes 20, and the plurality of heat exchange rows are arranged in parallel. Such an 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 curving the same plate. At this time, two adjacent first heat exchange fins 30 in a heat exchange column are connected to ensure the firmness of the first heat exchange fins 30.

[0069] Specifically, the first flat tube 20 and the second flat tube 82 have a flow channel for accommodating and circulating the heat exchange medium; the flow channel is connected to the first manifold 10; the equivalent diameter of the flow channel 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 is easy to miniaturize and integrate.

[0070] It should be noted that the so-called equivalent diameter in the present invention does not represent a restriction on the cross-sectional shape of the circulation channel, that is, the cross-sectional shape of the circulation channel can be not only circular, but also other shapes, such as rectangular, etc. The equivalent diameter only limits the volume of liquid flowing through the circulation channel per unit time; for example, when the cross-sectional shape of the circulation channel is rectangular, the volume of liquid flowing through the circulation channel per unit time falls within the range of the volume of liquid flowing through the circulation channel per unit time when the cross-sectional shape of the circulation channel is circular and the circular diameter 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 for accommodating and circulating the heat exchange medium; one of the first headers 10 serves as the inlet of the heat exchange medium, and the other first header 10 serves as the outlet of the heat exchange medium; a plurality of first flat tubes 20 are arranged along the axial direction of the first header 10 to form a flat tube group; the heat exchanger further includes at least two protective side plates 50, wherein one protective side plate 50 is arranged on the first flat tube 20 at one end of the flat tube group, and the other protective side plate 50 is arranged on the first flat tube 20 at the other end of the flat tube group to protect the first flat tube 20. By providing the protective side plates 50, the first flat tube 20 is effectively protected, thereby improving the working 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 processed through the first flat tube 20; the two first flat tubes 20 located at the outermost ends of the flat tube group are arranged to be not connected to the first collecting pipe 10, and at this time, the two first flat tubes 20 can be regarded as two protective side plates 50, which play a role in protecting the inner first flat tube 20.

[0073] like Figure 7As shown, the utility model also provides a waste heat recovery system, including the above-mentioned heat exchanger; the waste heat recovery system also 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, the evaporator 70, the throttling device 3 and the first heat exchange component 1 are sequentially connected through pipelines to form a refrigerant circulation pipeline; the 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, the first heat exchange fin 30 on the first heat exchange component 1 is fixedly connected to the second heat exchange component 2 by welding; the second heat exchange component 2 collects part of the heat emitted by the first heat exchange component 1 in the air, and transmits it to the heat exchange medium in the second heat exchange component 2. Such an arrangement realizes the high-efficiency heat utilization of the waste heat recovery system.

[0074] like Figure 7 As shown, 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 to perform convective heat exchange. The water tank 90, the circulation pump and the second heat exchange component 2 are sequentially connected 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. This arrangement provides structural support for the subsequent waste heat recovery system to provide hot water to users.

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

[0076] In a specific embodiment of the utility model, the water tank 90 is coated with an energy storage material or formed by processing the energy storage material, so that the energy-saving and heat-insulating performance of the water tank 90 is better. The energy storage material is used to store the heat of hot water; the energy storage material includes an organic phase change material, an inorganic phase change material, and a mixed phase change material in which organic and inorganic phase changes are mixed. The energy storage material can be flexibly selected according to the use environment, the use location and the customer's needs.

[0077] What needs to be explained in detail is that the heat pump air-conditioning system uses a four-way reversing valve to change the flow direction of the refrigerant. The difference from the 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 brought into the room by the hot air blown by the fan to achieve the purpose of indoor heating; but in the above process, some heat will accumulate in the condenser 80, which cannot be blown away in time by the wind. The heat exchanger proposed in the utility model has a plurality of first heat exchange fins 30 welded together with the second heat exchange component 2 through a brazing process, thereby realizing the effective recovery of excess heat in the heat pump air-conditioning system; the recovered heat can heat the flowing working medium water and store it in the water tank 90; subsequent customers can choose different usage methods according to different usage requirements; for example: direct use, ordinary insulation, combined use with electric water heaters or gas water heaters, etc.

[0078] In a specific embodiment of the present invention, the waste heat recovery system can be divided into the following three modes according to the mode of external hot water supply and energy storage:

[0079] A. When the waste heat recovery system is used in shopping malls, companies, hotels and other places with large traffic flow, large amount of hot water, and the hot water and heat pump air conditioning system are used in the same time period, the hot water in the water tank 90 can be set to a "take and use" hot water supply mode;

[0080] B. When the waste heat recovery system is used in a place where there are few people and the system produces more hot water, the water tank 90 can be set as a common heat preservation water storage device (i.e., the water tank 90 does not use energy storage materials) to store hot water, and then use it when the user needs it;

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

[0082] The above three schemes can all be used in combination with electric / gas water heaters; that is, when the temperature of the hot water in the water tank 90 does not meet the user's requirements, the electric / gas water heater heats the hot water and then provides it to the user for use; through the above settings, the waste heat recovery system effectively meets different usage requirements.

[0083] In summary, the utility model provides a heat exchanger and a waste heat recovery system; the heat exchanger proposed by the utility model is provided with a first heat exchange fin 30 disposed between two adjacent first flat tubes 20, and a part of the first heat exchange fin 30 extends out of the gap between the two adjacent first flat tubes 20, so that the first heat exchange component 1 in the heat exchanger can be directly connected to the second heat exchange component 2 through the first heat exchange fin 30 for contact heat exchange; by arranging a plurality of first heat exchange fins 30 at intervals, air flows through the gaps between the plurality of first heat exchange fins 30, and convection heat exchange can be performed, so that the second heat exchange component 2 can effectively collect the diffused heat in the air; through the above The combination of the two heat exchange modes of flow heat exchange and contact heat exchange makes the heat exchange efficiency of the heat exchanger proposed by the utility model higher, the overall heat exchange effect is good, and the actual use requirements are effectively met; the heat exchanger proposed by the utility model can be efficiently applied to the heat recovery of the condenser 80 on the air-cooled heat pump, and the heat exchanger can be applied to the hot water supply system of waste heat recovery, thereby realizing the full heat exchange of the heat dissipated by the condenser 80, effectively utilizing the heat of the condenser 80, and achieving the effect of energy saving and emission reduction; the heat exchanger proposed by the utility model is applied to the hot water supply system, without using too much electricity, gas and other energy sources, and to a certain extent, it also improves the energy saving and environmental protection of the hot water supply system. It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations.

[0084] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0085] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

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

[0087] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0088] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A heat exchanger, characterized in that: include: A first heat exchange component (1), the first heat exchange component (1) comprising a first header group, the first header group comprising two first headers (10) arranged at intervals; 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 header (10), the two ends of the first flat tubes (20) being respectively connected to the two first headers (10) of the first header group; A second heat exchange component (2), the second heat exchange component (2) comprising a second header group, the second header group comprising two second headers (81) arranged at intervals; a plurality of second flat tubes (82), the plurality of second flat tubes (82) being arranged at intervals along the axial direction of the second header (81), the two ends of the second flat tube (82) being respectively connected to the two second headers (81) of the second header group; the second heat exchange component (2) and the first heat exchange component (1) being arranged in parallel along the width direction of the first flat tube (20); The first heat exchange component (1) comprises a plurality of first heat exchange fins (30), wherein the first heat exchange fins (30) are arranged 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 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) comprises a plurality of second heat exchange fins, wherein the second heat exchange fins are arranged between two adjacent second flat tubes (82) and are conductively connected to at least one of the two adjacent second flat tubes (82), and 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) via the second heat exchange fins.

3. The heat exchanger according to claim 2, characterized in that: The first heat exchange fin (30) comprises a first fixed fin (37) and a first extending fin (38); along the width direction of the first flat tube (20), the first fixed fin (37) is arranged flush with at least one of the two adjacent first flat tubes (20) that are conductively connected; the first extending fin (38) is arranged extending from the two adjacent first flat tubes (20); one end of the first extending 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 comprises a second fixed fin and a second extending fin; along the width direction of the second flat tube (82), the second fixed fin is arranged flush with at least one of the two adjacent second flat tubes (82) that are conductively connected; the second extending fin is arranged extending from the two adjacent second flat tubes (82); one end of the second extending 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: The first fixed fin (37) and the first extending fin (38) are both wavy fins extending in a wave shape; the wavy fin has a length direction, a width direction and a height direction perpendicular to each other; in the length direction, the wavy fin has a corresponding front face (31) and a rear face (32); in the width direction, the wavy fin has a corresponding left face (33) and a right face (34); in the height direction, the wavy fin has a corresponding top face (35) and a bottom face (36); wherein one of the front face (31) and the rear face (32) of the first extending fin (38) extends between the two first flat tubes (20), and the other face is connected to the front face (31) or the rear face (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 ripples extend to be flush with the length direction; the width direction of the first fixed fin (37) and the width direction of the first extending fin (38) form 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 extending fin (38); A plurality of the first fixed fins (37) located between two adjacent first flat tubes (20) are used as a fixed heat exchange column (41), to form a plurality of the fixed heat exchange columns (41); the upper surfaces (35) and the lower surfaces (36) of the plurality of the first fixed fins (37) located in the same fixed heat exchange column (41) are respectively coplanar; A plurality of the first extending fins (38) located between two adjacent first flat tubes (20) are formed as an extending heat exchange row (42), so as to form a plurality of the extending heat exchange rows (42); the plurality of the first extending fins (38) located in the same extending heat exchange row (42) are arranged at equal intervals along the extension direction of the first flat tube (20), and the upper surfaces (35) and lower surfaces (36) of the plurality of the first extending fins (38) are respectively parallel; the height direction of the first extending fins (38) is parallel to the extension direction of the first flat tube (20); in the length direction, the front surface (31) or the rear surface (32) of the first extending fin (38) is conductively connected to the second heat exchange fin.

6. The heat exchanger according to claim 1, characterized in that: The portion of the first heat exchange fin (30) extending from between two adjacent first flat tubes (20) is arranged 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 current collecting tube (10) and the second current collecting tube (81) are arranged in parallel and at intervals; wherein, a plurality of the first flat tubes (20) and a plurality of the second flat tubes (82) are arranged side by side and at intervals in a one-to-one correspondence, the spacing between the first flat tubes (20) and the second flat tubes (82) is WCP, the width of the first flat tube (20) is W1, and 0.8W1≤WCP≤5W1 is satisfied; and / or, the first current collecting tube (10) and the second current collecting tube (81) are arranged in parallel and at intervals; wherein, a plurality of the first flat tubes (20) and a plurality of the second flat tubes (82) are arranged side by side and at intervals in a one-to-one correspondence, the spacing between the first flat tubes (20) and the second flat tubes (82) is WCP, the width of the second flat tube (82) is W2, and 0.8W2≤WCP≤5W2 is satisfied.

8. The heat exchanger according to any one of claims 1 to 5, characterized in that: A plurality of first slots are provided on the peripheral wall of the first collecting tube (10) and pass through the peripheral wall of the first collecting tube (10) along the wall thickness direction of the first collecting tube (10); the width direction of each first slot is parallel to the axial direction of the first collecting tube (10); the plurality of first slots are spaced apart along the axial direction of the first collecting tube (10); the distance between adjacent first slots in the axial direction of the first collecting tube (10) is greater than four times the width of the first slot; and / or a plurality of second slots are provided on the peripheral wall of the second collecting tube (81) and pass through the peripheral wall of the second collecting tube (81) along the wall thickness direction of the second collecting tube (81); the width direction of each second slot is parallel to the axial direction of the second collecting tube (81); the plurality of second slots are spaced apart along the axial direction of the second collecting tube (81); the distance between adjacent second slots in the axial direction of the second collecting tube (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) is connected to the two first collecting tubes (10) to form a first passage, and the second flat tube (82) is connected to the two second collecting tubes (81) to form a second passage. The first passage and the second passage are respectively used for circulating two liquids of different temperatures.

10. A waste heat recovery system, characterized in that: It comprises the heat exchanger as claimed in any one of claims 1 to 9; the waste heat recovery system also comprises an air-conditioning system and a heat recovery device, the air-conditioning system comprises 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 through pipelines to form a refrigerant circulation pipeline; wherein the first heat exchange component (1) serves as a condenser (80); the heat recovery device comprises the second heat exchange component (2), the first heat exchange fin (30) on the first heat exchange component (1) is fixedly connected to the second heat exchange component (2) by welding; the second heat exchange component (2) collects part of the heat dissipated by the first heat exchange component (1) in the air, 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, wherein the fan drives air to flow through the heat exchanger to perform 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, and the circulation pump is used to drive the heat exchange medium in the heat exchange medium circulation pipeline to flow; wherein 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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