Heat exchanger and method for manufacturing the same

Abstract

The heat exchanger disclosed in the present application includes a collecting pipe with an inner cavity, a plurality of heat exchange tubes with inner cavities, and fins. The fins are arranged between two adjacent heat exchange tubes. Part of the surface of the fins is coated with a hygroscopic material, which can delay frosting of the heat exchanger and maintain the heat exchange performance of the heat exchanger to a certain extent.

Description

Technical Field

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

[0002] The heat exchanger in the related art needs to be improved. Summary of the invention

[0003] According to one aspect of the present application, a heat exchanger is provided, comprising: a plurality of heat exchange tubes and fins, wherein the fins are arranged between two adjacent heat exchange tubes, and a portion of the surface of the fins is coated with a hygroscopic material.

[0004] The beneficial effects of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 It is a structural schematic diagram of a heat exchanger according to an embodiment of the present application;

[0006] Figure 2 yes Figure 1 A view of the heat exchanger of the embodiment of the present application along the Z direction;

[0007] Figure 3 yes Figure 1 A partial enlarged schematic diagram of area A in the heat exchanger of the embodiment of the present application;

[0008] Figure 4 It is a schematic diagram of the structure of the coating of the fin part in the heat exchanger of the embodiment of the present application;

[0009] Figure 5 is a schematic structural diagram of a heat exchange tube of a heat exchanger in an embodiment of the present application;

[0010] Figure 6 This is another schematic diagram comparing the fins of the heat exchanger in the embodiment of the present application before and after coating;

[0011] Figure 7 is a schematic diagram showing a comparison of another fin of the heat exchanger in the embodiment of the application before and after coating;

[0012] Figure 8 is a structural schematic diagram of a heat exchanger according to another embodiment of the present application;

[0013] Fig. 9 is a structural schematic diagram of a heat exchanger in yet another embodiment of the present application;

[0014] Fig.10 It is a schematic diagram of a heat exchange system shown in an exemplary embodiment of the present application.

[0015] Reference numerals:

[0016] Heat exchangers 100, 200, 300; headers 10, 11, 12; heat exchange tubes 20, 21, 22; first end 211; second end 212; third end 221; fourth end 222; fin 30; first end portion 33; third end portion 35; rib 231; circulation channel 232; protrusion 233; hygroscopic material 40; crest portion 31; trough portion 32; crest 311; trough 321; bend 24; first bend 241; second bend 242; straight pipe section 25; first straight pipe section 251; second straight pipe section 252; third straight pipe section 253; side plate 26; heat exchange system 1000; compressor 1; first heat exchanger 2; throttling device 3; second heat exchanger 4; reversing device 5 DETAILED DESCRIPTION

[0017] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0018] The terms used in this application are only for the purpose of describing specific embodiments, and are not intended to limit this application. In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0019] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] In the present application, unless otherwise expressly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The exemplary embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features in the following embodiments and implementations may complement or combine with each other.

[0021] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0022] The exemplary embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0023] The relevant heat exchangers, especially the evaporator, are used as outdoor heat exchangers in the operation of the heat pump system. Due to the low temperature of the internal refrigerant, a condensed water layer is easily formed on the surface of the evaporator, which then causes frost, causing the system efficiency to drop rapidly after running for a period of time.

[0024] The embodiment of the present application provides a heat exchanger that can delay the generation of condensed water and thus delay frosting. The heat exchanger can be used as an outdoor heat exchanger in a heat pump system to delay the rapid decrease in heat exchange performance of the system due to frosting of condensed water. It is easy to understand that in addition to being applied to a heat pump system as an outdoor heat exchanger, the heat exchanger can also be used for other air treatments, etc. This is not limited here.

[0025] like Figure 1The specific implementation of the heat exchanger of the present application is described with reference to the accompanying drawings and, when necessary, in combination with other drawings.

[0026] A heat exchanger 100 according to an embodiment of the present application may include a header 10, a plurality of heat exchange tubes 20, and fins 30. The header 10 has an inner cavity (not shown) for the flow of refrigerant, and is in the shape of a round tube. The header 10 has two, namely a first header 11 and a second header 12, and the first header 11 and the second header 12 are arranged substantially in parallel. It should be noted that the heat exchanger 100 and the air generally undergo only one heat exchange, which is often referred to as a single-layer heat exchanger in the industry.

[0027] Of course, in some other embodiments, the manifold 10 may also be a D-shaped or square tube, and its specific shape is not limited, as long as its bursting pressure meets the system requirements. The relative position of the manifold 10 is also not limited, as long as it meets the actual installation requirements. The number of the manifold 10 may also be only one, as long as it meets the heat exchange requirements, which is not limited here. The manifold 10 in the embodiment of the present application takes a round tube as an example.

[0028] The heat exchange tubes 20 are arranged in a plurality along the axial direction of the header 10 and are substantially parallel to each other. The plurality of heat exchange tubes 20 each have a first end 221 and a second end 222. Figure 1 As shown, the heat exchange tube 20 includes a first heat exchange tube 21 and a second heat exchange tube 22 arranged in parallel. The direction from the first end 221 of the heat exchange tube 20 to the second end 222 is defined as the length direction of the heat exchange tube. The first end 211 of the first heat exchange tube 21 is connected to the first header 11, and the second end 212 of the first heat exchange tube 21 is connected to the second header 12. Similarly, the first end 221 of the second heat exchange tube 22 is connected to the first header 11, and the second end 222 of the second heat exchange tube 22 is connected to the second header 12. The first heat exchange tube 21 and the second heat exchange tube 22 are arranged roughly in parallel. The heat exchange tube 20 has an inner cavity (not shown in the figure) for the flow of refrigerant. Such connection makes the inner cavity of the heat exchange tube 20 communicate with the inner cavity of the header 10, forming a refrigerant flow channel (not shown in the figure) of the heat exchanger 100. The refrigerant can flow in the heat exchange channel and achieve heat exchange through the heat exchanger 100.

[0029] It should be noted that the heat exchange tube 20, also known as a flat tube in the industry, has an inner cavity for the flow of refrigerant. Figure 5As shown, the inner cavity of the heat exchange tube 20 (not shown in the figure) is usually separated into multiple refrigerant flow channels 232 by ribs 231. Such a configuration not only increases the heat exchange area of ​​the heat exchange tube 20, so that the heat exchange efficiency can be improved, but also a tiny protrusion 233 can be provided on the inner surface of the heat exchange tube 20, and the protrusion 233 can form a capillary effect to enhance heat exchange. The protrusion 233 can be serrated, wavy, triangular, etc. (not shown in the figure), and its shape can be set as needed. Adjacent channels 232 are isolated from each other. Multiple channels 232 are arranged in a row, which jointly affect the width of the heat exchange tube 20. The heat exchange tube 20 is flat as a whole, and its length is greater than its width, and its width is greater than its thickness. The heat exchange tube mentioned here is not limited to this type, and can also be other forms. For example, adjacent channels may not be completely isolated. For another example, all channels can be arranged in two rows, as long as their width is still greater than their thickness.

[0030] like Figures 1 to 4 As shown, the heat exchanger 100 of the embodiment of the present application further includes fins 30, and part of the surface of the fins 30 is coated with a hygroscopic material 40. The hygroscopic material 40 is a mixture of one or more hygroscopic materials such as silica gel, zeolite or halide, and is dissolved to form a sol, and the hygroscopic material 40 can be used for moisture absorption. When the heat exchanger 100 is used as an evaporator in a heat exchange system, its outer surface is usually at a low temperature, and the moisture in the air is easily condensed on the surface of the evaporator to form a water film, or further frost, thereby affecting the heat exchange performance of the evaporator. The hygroscopic material 40 can absorb moisture or water on the surface of the evaporator through its unique hygroscopic characteristics, and then delay or avoid the formation of a water film on the surface of the evaporator, and then delay or avoid frost on the surface of the evaporator, thereby maintaining the heat exchange performance of the evaporator to a certain extent, or delaying the rapid decline of the heat exchange performance of the evaporator. It is worth noting that the surface of the heat exchanger in the related art is coated with functional materials, such as corrosion-resistant materials, etc. Specifically, the entire outer surface of the heat exchanger is coated. Since the functional materials will affect the heat transfer effect, thereby causing the heat transfer performance of the entire heat exchanger to decrease, the present application mainly coats part of the outer surface of the heat exchanger, especially the fins. In other words, the hygroscopic material is coated on the frost-prone part of the heat exchanger. The hygroscopic properties of the hygroscopic material are used to delay the formation of water film or frost to a certain extent, so that the heat transfer efficiency of the heat exchanger can be guaranteed while delaying the attenuation of the heat transfer efficiency to a certain extent. The specific coating structure and coating method will be described in detail in the following description.

[0031] like Figure 3 , Figure 4 As shown, the fin 30 is a window-type fin and has a crest portion 31 and a trough portion 32 .

[0032] It should be noted that in other embodiments, the fins may be fins without windows. The shape of the fins may be roughly wavy or profiled, and the cross-section of the fins may be a sine wave or a nearly sine wave or a sawtooth wave, as long as the needs are met, and the specific structure is not limited.

[0033] In the embodiment of the present application, the fin 30 is in a wave shape as a whole, the crest part 31 and the trough part 32 are arranged one by one, the fin 30 is arranged between two adjacent heat exchange tubes 20, the crest part 31 at least partially contacts the heat exchange tube 21, and the trough part 32 at least partially contacts the heat exchange tube 22. The highest point of the crest part 311 is the crest 311, and the lowest point of the trough part 32 is the trough 321. The extending direction of the crest part 31 and the trough part 32 of the fin 30 arranged one by one is the length direction of the fin 30 (such as Figure 4 The vertical direction between the plane where the crest 311 is located and the plane where the trough 321 is located is defined as the height direction of the fin (eg Figure 4 As can be seen, the length direction of the fin 30 is the same as the length direction of the heat exchange tube 20 (X direction in the figure), the width direction of the fin 30 is the same as the width direction of the heat exchange tube 20 (Y direction in the figure), and the spacing between the heat exchange tubes 20 is the height direction of the fin 30 (Z direction in the figure).

[0034] like Figure 4 In one embodiment of the present application, a portion of the surface of the fin 30 is coated with a hygroscopic material 40. Specifically, the portion of the surface coating is coated with the hygroscopic material 40 on the crest portion 31 and / or the trough portion 32. The crest portion 31 and / or the trough portion 32 of the fin 30 are coated with the hygroscopic material 40, and the crest portion 31 or the trough portion 32 accounts for 10% to 30% of the overall height of the fin 30. In other words, the crest portion 31 of the fin 30 is the portion of the fin 30 extending from the crest top 311 to the trough bottom 321 to 10% to 30% of the height of the fin 30, and the crest portion 31 is coated with the hygroscopic material 40. The trough portion 32 of the fin 30 is the portion of the fin 30 extending from the trough bottom 321 to the trough top 311 to 10% to 30% of the height of the fin 30, and the trough portion 32 is coated with the hygroscopic material 40. It should be noted that the hygroscopic material 40 coated on the crest part 31 and the trough part 32 can be uniformly coated or non-uniformly coated. The coating thickness of the hygroscopic material is 0.1 mm to 0.3 mm, for example, 0.15 mm, 0.2 mm, 0.25 mm. It should be noted that the coating thickness of the hygroscopic material 40 is an approximate thickness. Due to the limitation of the process or other conditions, it may not achieve a completely uniform coating effect, or the coating may be non-uniform, which is not limited here.

[0035] like Figure 1 , Figure 3 In the embodiment shown, part of the surface of the fin 30 is coated with a hygroscopic material 40, that is, Figure 1 The area a in the figure is coated with a hygroscopic material 40, and the partial surface coating is coated from the end of the fin 30 along the length direction of the fin 30, and the coating area accounts for 5% to 15% of the total length of the fin 30. In other words, along the length direction of the fin 30 (i.e., the X direction in the figure), the total length of the fin 30 is L, and the coating is applied from the end 33 of the first end of the fin 30, and the length a of the part of the fin coated with the hygroscopic material accounts for 5% to 15% of the total length L of the fin 30, for example, the length of the part of the fin coated with the hygroscopic material accounts for 10% of the total length of the fin 30. With such a structure, when the heat exchanger 30 is in a vertical state during actual use, the condensed water in the air is more likely to flow from the upper fin to the lower fin under the influence of the force, and accumulate in the lower fin area, which can avoid the decrease in heat exchange efficiency caused by the overall coating, and can absorb moisture in the frosting-prone part to delay frosting and thus delay the speed of heat exchange performance decay of the heat exchanger. The vertical state means that the header 10 is arranged roughly horizontally, that is, its center line is roughly horizontal, or there is an angle with the horizontal line but the angle is small. At this time, the heat exchange tube 20 is arranged roughly vertically.

[0036] like Figure 6The above is a schematic diagram of another embodiment of partial coating of the fin 30 of the present application before and after coating, in which a partial surface of the fin 30 is coated with a hygroscopic material 40, and the partial surface coating is coated from the end of the fin 30 along the width direction of the fin 30 (i.e., the Y direction in the figure), and the coating area accounts for 30% to 50% of the total width of the fin 30. In other words, along the width direction of the fin 30 (i.e., the Y direction in the figure), the coating is carried out from the end 35 of the third end of the fin 30, and the width of the partial fin coated with the hygroscopic material 40 accounts for 30% to 50% of the total width of the fin 30, for example, the width of the partial fin 30 coated with the hygroscopic material 40 accounts for 40% of the total width of the fin 30. Among them, B1 is a schematic diagram of the uncoated fin 30, and B3 is a schematic diagram of partial coating along the width direction Y, in which the coating area roughly accounts for 50% of the width of the fin 30. With such a structure, when the heat exchanger 100 is used in a horizontal state during actual use, the fins 30 partially coated at the air inlet section absorb water molecules in the air to avoid the decrease in heat exchange efficiency caused by the overall coating, and at the same time, it can absorb moisture at the frost-prone part (here mainly refers to the air inlet, that is, the windward side of the heat exchanger 100) to delay frost formation and thus delay the time for the heat exchange performance of the heat exchanger to decrease. Among them, the horizontal state means that the header is roughly horizontally arranged, that is, its center line is roughly horizontal, or there is an angle with the horizontal line but the angle is small. At this time, the heat exchange tube is roughly vertically arranged, that is, the length direction of the heat exchange tube is roughly parallel to the X direction. Among them, the horizontal state means that the header is roughly vertically arranged, that is, its center line is roughly vertical, or there is an angle with the vertical line but the angle is small. At this time, the heat exchange tube is roughly horizontally arranged, that is, the length direction of the heat exchange tube is roughly parallel to the horizontal direction.

[0037] like Figures 7 to 9 The heat exchanger 200 and the heat exchanger 300 of another embodiment of the present application are shown. The heat exchanger 200 and the heat exchanger 300 also include a header 10, a plurality of heat exchange tubes 20 and fins 30. The difference from the heat exchanger 100 is that the plurality of heat exchange tubes 20 of the heat exchanger 200 and the heat exchanger 300 have one or two bent portions 24. Figure 8 As shown, the heat exchanger 200 has a bent portion 24. Fig. 9 As shown, the heat exchanger 300 has two bending parts 24, namely a first bending part 241 and a second bending part 242. Of course, in some other embodiments, there may be more than two bending parts 24, which can be set according to actual needs. It should be noted that the heat exchanger 100 and the air undergo heat exchange more than once, which is often referred to as a multi-layer heat exchanger or an N-layer heat exchanger in the industry.

[0038] As shown in Figure 8 and combined with the above-mentioned embodiments, taking the heat exchanger 200 as an example, the heat exchanger 200 has a first header 11, a second header 12, a plurality of heat exchange tubes 20 and fins 30. The first header 11 and the second header 12 are arranged roughly in parallel, one end of each heat exchange tube 20 is connected to the first header 11, and the other end is connected to the second header 12. The inner cavities of the first header 11, the second header 12 and the plurality of heat exchange tubes 20 are connected, and together constitute a circulation channel for the refrigerant (not shown in the figure). Each of the heat exchange tubes 20 has a bending portion 24 and a straight tube section 25, the bending portion 24 has one, and the straight tube section 25 has two, namely, a first straight tube section 251 and a second straight tube section 252. The fins 30 are arranged between adjacent heat exchange tubes 20, and the length direction of the fins 30 is roughly the same as the length direction of the heat exchange tubes 20. Specifically, the fins 30 are disposed between the first straight tube sections 251 of the adjacent heat exchange tubes 20 and / or between the second straight tube sections 252 of the adjacent heat exchange tubes 20, and part of the surface of the fins 30 is coated with a hygroscopic material 40. For example, the fins 30 disposed between the first straight tube sections 251 of the heat exchange tubes 20 are coated with a hygroscopic material 40, while the fins 30 disposed between the second straight tube sections 252 of the heat exchange tubes 20 are not coated with a hygroscopic material 40. Alternatively, the fins 30 disposed between the first straight tube sections 251 of the heat exchange tubes 20 are not coated with a hygroscopic material 40, while the fins 30 disposed between the second straight tube sections 252 of the heat exchange tubes 20 are coated with a hygroscopic material 40. The above structures are all partial coatings of the fins 30 of the heat exchanger 200.

[0039] It should be noted that the FPI (FPI, i.e., fin per inch, a unit commonly used in the industry to indicate the density of fins) of the fins 30 disposed between the first straight tube sections 251 of the heat exchange tube 20 may be the same as or different from the FPI of the fins 30 disposed between the second straight tube sections 252 of the heat exchange tube 20. Figure 8 As shown, when the heat exchanger 200 is used as an outdoor heat exchanger in the actual operation of the heat pump system, the first straight tube section 251 is used as the windward side, and the second straight tube section 252 is used as the leeward side. Then, the fins 30 between the first straight tube sections 251 of the heat exchange tube 20 are coated with the hygroscopic material 40, while the fins 30 between the second straight tube sections 252 are not coated with the hygroscopic material 40. At the same time, the FPI of the fins 30 arranged between the first straight tube sections 251 is less than the FPI of the fins 30 arranged between the second straight tube sections 252. In this way, the heat exchange efficiency of the fins 30 between the first straight tube sections 251 as the windward side is reduced due to the coating of the hygroscopic material 40, which is compensated by the increase in the FPI of the fins 30 between the second straight tube sections 252 as the leeward side.

[0040] like Fig. 9 As shown and combined with the above-mentioned embodiments, taking the heat exchanger 300 as an example, the heat exchanger 300 has a first header 11, a second header 12, a plurality of heat exchange tubes 20 and fins 30. The first header 11 and the second header 12 are arranged roughly in parallel, one end of each heat exchange tube 20 is connected to the first header 11, and the other end is connected to the second header 12. The inner cavities of the first header 11, the second header 12 and the plurality of heat exchange tubes 20 are connected, and together constitute a circulation channel for the refrigerant (not shown in the figure). Each of the heat exchange tubes 20 has two bends 24, namely a first bend 241 and a second bend 242. Each of the heat exchange tubes 20 has three straight sections 25, namely a first straight section 251, a second straight section 252 and a third straight section 253. The fins 30 are arranged between adjacent heat exchange tubes 20, and the length direction of the fins 30 is roughly the same as the length direction of the heat exchange tubes 20. Specifically, the fins 30 are disposed between the first straight tube sections 251 of the adjacent heat exchange tubes 20 and / or between the second straight tube sections 252 of the adjacent heat exchange tubes 20 and / or between the third straight tube sections 253 of the adjacent heat exchange tubes 20, and part of the surface of the fins 30 is coated with a hygroscopic material 40. For example, the fins 30 disposed between the first straight tube sections 251 of the heat exchange tubes 20 are coated with a hygroscopic material 40, while the fins 30 disposed between the second straight tube sections 252 of the heat exchange tubes 20 are not coated with a hygroscopic material 40. Alternatively, the fins 30 disposed between the first straight tube sections 251 of the heat exchange tubes 20 are not coated with a hygroscopic material 40, while the fins 30 disposed between the second straight tube sections 252 of the heat exchange tubes 20 are coated with a hygroscopic material 40. The above structures are all partial coatings of the fins 30 of the heat exchanger 200. In actual operation of the heat exchange system, the side of the heat exchanger where the fins coated with the hygroscopic material 40 are located is the windward side.

[0041] It is to be noted that the FPI of the fins 30 disposed between the first straight tube sections 251 of the heat exchange tube 20 may be the same as or different from the FPI of the fins 30 disposed between the second straight tube sections 252 of the heat exchange tube 20. For example, when the heat exchanger 300 is used as an outdoor heat exchanger in the actual operation of the heat pump system, the first straight tube section 251 serves as the windward side, and the second straight tube section 252 serves as the leeward side. The fins 30 between the first straight tube sections 251 of the heat exchange tube 20 are coated with the hygroscopic material 40, while the fins 30 between the second straight tube sections 252 are not coated with the hygroscopic material 40. At the same time, the FPI of the fins 30 disposed between the first straight tube sections 251 is less than the FPI of the fins 30 disposed between the second straight tube sections 252. In this way, the decrease in heat exchange efficiency of the fins 30 between the first straight tube sections 251 on the windward side due to coating with the hygroscopic material 40 is compensated by the increase in FPI of the fins 30 between the second straight tube sections 252 on the leeward side.

[0042] It should be noted that the process for preparing the single-layer heat exchanger and the multi-layer heat exchanger in the embodiments of the present application has the fin portion surface coated with a hygroscopic material.

[0043] Taking the single-layer heat exchanger 100 as an example, the manifold 10, the plurality of heat exchange tubes 20 and the heat exchange fins 30 are assembled, and then the spraying method is adopted, that is, the sol containing the hygroscopic material 40 is coated on a part of the surface area of ​​the heat exchanger 100 by spraying. During the spraying process, it is necessary to control the area where the hygroscopic material 40 is sprayed on the fins, so as to achieve partial coating. For example, when coating the crest 31 and / or trough 32 of the fin 30, it can be achieved in a manner similar to spraying slogans, that is, a solid thin sheet material is used to block the middle area of ​​the fin 30 and expose the area to be sprayed, and then spraying is performed to ensure that only the crest 31 and / or trough 32 are coated. The coating effect is as follows: Figure 4 shown.

[0044] Taking the multi-layer heat exchanger 200 as an example, the collecting pipe 10, the multiple heat exchange tubes 20 and the heat exchange fins 30 are assembled, and the windward area of ​​the heat exchanger 200, such as the first straight pipe section 251, is immersed in the sol containing the hygroscopic material 40, and then left to dry. After the hygroscopic material 40 is tightly adsorbed on the fins 30 of the heat exchanger 200, the next process is carried out as needed. The thickness of the hygroscopic material coated on the surface of the heat exchanger 200 is 0.1mm to 0.3mm, for example 0.15mm, 0.2mm, 0.25mm, so that the moisture absorption amount can be guaranteed. The comparison diagram of the fins before and after coating is as shown in the figure Figure 6 and Figure 7As shown, the coating thickness b is controlled by the number of times of immersion in the container, that is, if the coating thickness needs to be increased, it can be left to dry after immersion, and the above steps can be repeated again after the hygroscopic material is tightly adsorbed on the fin surface of the heat exchanger 200. It should be noted that the coating thickness of the above hygroscopic material 40 is an approximate thickness, and due to the limitations of the process or other conditions, it may not be possible to achieve a completely uniform coating effect, or the coating is non-uniform, which is not limited here.

[0045] Similarly, for the multilayer heat exchanger 300 or other multilayer heat exchangers, the windward side area is immersed in the sol containing the hygroscopic material 40, and then left to dry. After the hygroscopic material 40 is tightly adsorbed on the fins 30 of the heat exchanger 200, the next step of the process is carried out as needed. The thickness of the hygroscopic material coated on the surface of the heat exchanger 200 is 0.1mm to 0.3mm, for example 0.15mm, 0.2mm, 0.25mm, so that the moisture absorption capacity can be guaranteed. The comparison of the fins before and after coating is shown in the figure below. Figure 7 As shown, the coating thickness is controlled by the number of times of immersion in the container, that is, if the coating thickness needs to be increased, it can be left to dry after immersion, and the above steps can be repeated again after the hygroscopic material is tightly adsorbed on the fin surface of the heat exchanger 200. It should be noted that the coating thickness of the above hygroscopic material 40 is an approximate thickness, and due to the limitations of the process or other conditions, it may not be possible to achieve a completely uniform coating effect, or the coating is non-uniform, which is not limited here.

[0046] It should be noted that the above-mentioned spraying method may splash onto the surface of the heat exchange tube 20 during the spraying operation, and the above-mentioned immersion method will inevitably coat the hygroscopic material 40 onto the surface of the heat exchange tube 20 during the immersion operation.

[0047] like Fig.10As shown, a heat exchange system 1000 is shown in an exemplary embodiment of the present application, and the heat exchange system 1000 at least includes a compressor 1, a first heat exchanger 2, a throttling device 3, a second heat exchanger 4 and a reversing device 5. Optionally, the compressor 1 of the heat exchange system 1000 can be a horizontal compressor or a vertical compressor. Optionally, the throttling device 3 can be an expansion valve. In addition, the throttling device 3 can also be other components that have the function of reducing pressure and regulating flow of the refrigerant. This application document does not specifically limit the type of throttling device, which can be selected according to the actual application environment and will not be repeated here. It should be noted that in some systems, there may be no reversing device 5. The heat exchangers 100, 200, and 300 described in the present invention can be used in the heat exchange system 1000 as the first heat exchanger 2 and / or the second heat exchanger 4. In the heat exchange system 1000, the compressor 1 compresses the refrigerant, the temperature of the compressed refrigerant increases, and then enters the first heat exchanger 2, and transfers heat to the outside through the heat exchange between the first heat exchanger 2 and the outside, and then the refrigerant passes through the throttling device 3 and becomes a liquid or gas-liquid two-phase state. At this time, the temperature of the refrigerant decreases, and then the refrigerant with a lower temperature flows to the second heat exchanger 4, and enters the compressor 1 again after the second heat exchanger 4 exchanges heat with the outside, realizing the refrigerant circulation. When the second heat exchanger 4 is used as an outdoor heat exchanger to exchange heat with the air, refer to the above example and arrange the heat exchanger according to the wind direction.

[0048] The above is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as a preferred embodiment as above, it is not intended to limit the present application. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A heat exchanger, comprising: A plurality of heat exchange tubes, a collecting tube and fins, wherein the fins are arranged between two adjacent heat exchange tubes, and characterized in that a part of the surface of the fins is coated with a hygroscopic material, The heat exchange tube includes a windward heat exchange tube and a leeward heat exchange tube bent from the windward heat exchange tube, the fin includes a first fin located between the windward heat exchange tubes and a second fin located at the leeward heat exchange tube, the first fin is coated with a hygroscopic material, the second fin is not coated with a hygroscopic material, the fin is in a corrugated shape as a whole, and has a crest portion and a trough portion, and the spacing between the crest portions of the first fin is greater than the spacing between the crest portions of the second fin; Or, the fin is in a corrugated shape as a whole and has a crest portion and a trough portion, the crest portion and the trough portion are arranged at intervals, the crest portion and the trough portion are respectively connected to the adjacent heat exchange tube, and the hygroscopic material is coated on the crest portion and / or the trough portion of the fin, The portion of the fin coated with the hygroscopic material accounts for 10% to 30% of the overall height of the fin; or, the hygroscopic material is coated along the width direction of the fin, and the coating area accounts for 30% to 50% of the width of the fin; Alternatively, the hygroscopic material is coated from the end of the fin along the length direction of the fin, and the coated area occupies 5% to 15% of the length of the fin.

2. The heat exchanger according to claim 1, characterized in that The fins are window-type fins.

3. The heat exchanger according to claim 1, characterized in that The hygroscopic material is one or a mixture of silica gel, zeolite and halogen salt.

4. The heat exchanger according to claim 1, characterized in that The coating thickness of the hygroscopic material is 0.1 mm to 0.3 mm.

5. A method for manufacturing a heat exchanger as claimed in claim 1, characterized in that: The steps include: (1) providing heat exchange tubes, headers and fins, assembling the fins between the heat exchange tubes, and assembling the headers at the ends of the heat exchange tubes; (2) Provide a hygroscopic material and partially coat the fin with the hygroscopic material.

6. The method for manufacturing a heat exchanger according to claim 5, characterized in that: In step (2), one side of the heat exchange tube and the fin is immersed in the hygroscopic material, and the heat exchange tube is bent to form a windward heat exchange tube and a leeward heat exchange tube, and the fin includes a first fin located between the windward heat exchange tubes and a second fin located between the leeward heat exchange tubes, and the first fin is coated with a hygroscopic material.

7. The method for manufacturing a heat exchanger according to claim 5, characterized in that: In step (2), a sol containing a hygroscopic material is applied to a portion of the fin by spraying.

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