Heat exchanger and air conditioning system

Abstract

The application relates to the technical field of air conditioning systems, and discloses a heat exchanger, which comprises a casing provided with an air flow channel, a heat exchange part arranged in the air flow channel and comprising a first heat exchange module located at a windward side and a second heat exchange module located at a leeward side, and a fan part arranged in the air flow channel and located downstream of the heat exchange part along an air flow direction, wherein the surface of the first heat exchange module is provided with a hydrophobic coating, and the surface of the second heat exchange module is provided with a hydrophilic coating. In this way, the windward side can be prevented from being prone to frost formation, and the fan can be prevented from blowing water. The application further discloses an air conditioning system.

Description

Technical Field

[0001] This application relates to the field of air conditioning system technology, such as a heat exchanger and an air conditioning system. Background Technology

[0002] With the development of technology and the improvement of people's living standards, air conditioning systems have been widely used, and people's requirements for air conditioning systems are getting higher and higher, leading to continuous optimization of their performance. In related technologies, the core components of an air conditioning system mainly include the compressor, condenser, throttling device, and evaporator, which work together to achieve functions such as cooling, heating, and defrosting.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0004] The condenser is prone to frost formation on the windward side, and during defrosting, defrosting water can be blown onto the fan by the airflow, causing the fan to blow water.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a heat exchanger and an air conditioning system that can reduce frost formation on the windward side and reduce water blowing by the fan.

[0008] In some embodiments, the heat exchanger includes:

[0009] The casing is equipped with airflow channels;

[0010] The heat exchange section is located within the airflow channel and includes a first heat exchange module located on the windward side and a second heat exchange module located on the leeward side.

[0011] The fan section is located within the airflow channel and downstream of the heat exchange section along the airflow direction;

[0012] The surface of the first heat exchange module is provided with a hydrophobic coating, and the surface of the second heat exchange module is provided with a hydrophilic coating.

[0013] In some embodiments, the air conditioning system includes the heat exchanger.

[0014] The heat exchanger and air conditioning system provided in this disclosure can achieve the following technical effects:

[0015] During heat exchanger operation, the first heat exchange module on the windward side comes into contact with the airflow first. When the temperature is low, water vapor in the airflow condenses on its surface, forming water droplets and eventually frosting. The hydrophobic coating reduces the adhesion of water droplets, facilitating their sliding off the first heat exchange module and reducing frosting. Meanwhile, since the fan unit is located downstream of the heat exchange section, condensed water droplets or defrost water on the heat exchange section are easily blown onto the fan unit by the airflow, causing the fan to blow water. The hydrophilic coating, however, has a stronger adhesion of water droplets. Water droplets sliding off the first heat exchange module and blown onto the second heat exchange module, as well as condensed water droplets or defrost water on the second heat exchange module itself, can be effectively absorbed by the hydrophilic coating, thus reducing the problem of the fan blowing water.

[0016] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0018] Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of this disclosure;

[0019] Figure 2 This is a refrigerant flow diagram for the first defrosting mode provided in this embodiment of the present disclosure;

[0020] Figure 3 This is a refrigerant flow diagram for the second defrosting mode provided in this embodiment of the present disclosure;

[0021] Figure 4 This is a refrigerant flow diagram for the third and fourth defrosting modes provided in the embodiments of this disclosure;

[0022] Figure 5 This is a refrigerant flow diagram for the first refrigeration mode provided in this embodiment of the present disclosure;

[0023] Figure 6 This is a refrigerant flow diagram for the second refrigeration mode provided in this embodiment of the present disclosure;

[0024] Figure 7 This is a refrigerant flow diagram for the third refrigeration mode provided in this embodiment of the present disclosure;

[0025] Figure 8 This is a refrigerant flow diagram for the first heating mode provided in this embodiment of the present disclosure;

[0026] Figure 9 This is a refrigerant flow diagram for the second heating mode provided in this embodiment of the present disclosure;

[0027] Figure 10 This is a refrigerant flow diagram for the third heating mode provided in this embodiment of the present disclosure;

[0028] Figure 11 This is a schematic diagram of the structure of the heat exchanger provided in the embodiments of this disclosure;

[0029] Figure 12 This is a schematic diagram of the structure of the first and second heat exchange modules provided in the embodiments of this disclosure;

[0030] Figure 13 This is a schematic diagram of the airflow direction provided in an embodiment of this disclosure;

[0031] Figure 14 This is a schematic diagram of the structure of the first fin and the second fin provided in the embodiments of this disclosure;

[0032] Figure 15 This is a schematic diagram of the microchannel heat exchange structure provided in the embodiments of this disclosure.

[0033] Figure label:

[0034] 100. Compressor; 110. Four-way reversing valve; 120. Outdoor heat exchanger; 121. First heat exchanger; 1211. First throttling element; 122. Second heat exchanger; 1221. Second throttling element; 130. Indoor heat exchanger; 131. Third heat exchanger; 140. Conductor section; 141. First valve port; 142. Second valve port; 143. Third valve port; 150. Bypass section; 151. First bypass pipeline; 1511. First on / off element; 152. Second bypass pipeline; 1521. Second on / off element;

[0035] 200, Heat exchange section; 210, First heat exchange module; 211, First heat exchange tube; 212, First fin; 213, Finned heat exchange structure; 214, Microchannel heat exchange structure; 220, Second heat exchange module; 221, Second heat exchange tube; 222, Second fin; 230, Fan section; 240, Housing. Detailed Implementation

[0036] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0037] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for describing embodiments of this disclosure herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0038] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0039] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0040] Unless otherwise stated, the term "multiple" means two or more.

[0041] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0042] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0044] like Figure 1 As shown, this disclosure provides an air conditioning system including a compressor 100, a four-way reversing valve 110, an outdoor heat exchanger 120, an indoor heat exchanger 130, a connecting section 140, and a bypass section 150. The compressor 100, four-way reversing valve 110, outdoor heat exchanger 120, and indoor heat exchanger 130 form a refrigerant circulation main loop. The outdoor heat exchanger 120 includes a first heat exchanger 121 and a second heat exchanger 122. The first end of the first heat exchanger 121 is connected to the indoor heat exchanger 130 via a first throttling element 1211, and the first end of the second heat exchanger 122 is connected to the indoor heat exchanger 130 via a second throttling element 1221. The connecting section 140 includes a switchable first valve port 141, a second valve port 142, and a third valve port 143. When any two valve ports are switched to open, the other valve port is closed. The first valve port 141 is connected to the second end of the first heat exchanger 121, and the second valve port 142 is connected to the four-way reversing valve 110. The second end of the second heat exchanger 122 is connected between the second valve port 142 and the four-way reversing valve 110. The bypass section 150 includes a first bypass pipe 151 with a first on / off element 1511 and a second bypass pipe 152 with a second on / off element 1521. The first end of the first bypass pipe 151 is connected between the second throttling element 1221 and the first end of the second heat exchanger 122, and the second end of the first bypass pipe 151 is connected to the third valve port 143. The first end of the second bypass pipe 152 is connected between the compressor 100 and the four-way reversing valve 110, and the second end of the second bypass pipe 152 is connected between the first on / off element 1511 and the third valve port 143.

[0045] In this embodiment, the outdoor heat exchange device 120 is composed of a first heat exchanger 121 and a second heat exchanger 122. The two heat exchangers are connected to the indoor heat exchange device 130 through corresponding first throttling elements 1211 and second throttling elements 1221, respectively, enabling the two heat exchangers to operate independently or work together. Furthermore, the three-valve design of the conduction section 140 and the two bypass pipe designs of the bypass section 150 enable multiple flow paths, resulting in better performance optimization and improvement of the air conditioning system's cooling, heating, and defrosting functions.

[0046] Optionally, the air conditioning system has a first defrost mode, which corresponds to: the first valve port 141 and the third valve port 143 being connected, the first on / off element 1511 being blocked, the second on / off element 1521 being connected, the first throttling element 1211 being throttled or fully open, and the second throttling element 1221 being throttled.

[0047] In this embodiment, as Figure 2 As shown, in the first defrost mode, the refrigerant has two flow paths: First, it flows sequentially from the compressor 100's exhaust port, through the four-way reversing valve 110, and the indoor heat exchanger 130 to the second throttling element 1221. Second, it flows from the compressor 100's exhaust port, through the second bypass pipe 152, the third valve port 143, the first valve port 141, the first heat exchanger 121, and the first throttling element 1211 to the second throttling element 1221. Then, the refrigerant flows sequentially from the second throttling element 1221 to the second heat exchanger 122, the four-way reversing valve 110, and the compressor 100's return port. In this way, the sensible heat of the refrigerant is used to defrost the first heat exchanger 121.

[0048] Optionally, the air conditioning system has a second defrost mode, which corresponds to: the first valve port 141 and the second valve port 142 being connected, the first on / off element 1511 being connected, the second on / off element 1521 being connected, the first throttling element 1211 being throttled and the second throttling element 1221 being closed.

[0049] In this embodiment, under the second defrosting mode, the refrigerant has two flow paths: The first path flows sequentially from the compressor 100's exhaust port, through the four-way reversing valve 110, the indoor heat exchanger 130, the first throttling element 1211, the first heat exchanger 121, the first valve port 141, and the second valve port 142 to the four-way reversing valve 110. The second path flows sequentially from the compressor 100's exhaust port, through the second bypass pipe 152, the first bypass pipe 151, the first shut-off element 1511, and the second heat exchanger 122 to the four-way reversing valve 110. Then, the refrigerant flows from the four-way reversing valve 110 to the compressor 100's return port. Furthermore, by controlling the opening degree of the first shut-off element 1511 and the second shut-off element 1521, the flow rate of the refrigerant along the second flow path can be adjusted. Thus, by reasonably controlling the refrigerant flow rate, adverse effects on the compressor 100 can be avoided. Optionally, the second end of the second heat exchanger 122 is connected between the first throttling element 1211 and the indoor heat exchange device 130 via a third bypass pipe. In this way, the refrigerant in the second heat exchanger 122 can flow through the third bypass pipe to the first throttling element 1211, and then through the first heat exchanger 121 and the four-way reversing valve 110 to the return port of the compressor 100. Thus, the sensible heat of the refrigerant is used to defrost the second heat exchanger 122.

[0050] Optionally, the air conditioning system has a third defrosting mode, which corresponds to: the first valve port 141 and the second valve port 142 being connected, the first on / off element 1511 being blocked, the second on / off element 1521 being blocked, and the opening degree of the first throttling element 1211 being greater than the opening degree of the second throttling element 1221.

[0051] In this embodiment, as Figure 4As shown, the refrigerant discharged from the compressor 100 flows to the indoor heat exchanger 130 through the four-way reversing valve 110. The refrigerant flowing out of the indoor heat exchanger 130 has two flow paths: the first path flows sequentially through the first throttling element 1211, the first heat exchanger 121, the first valve port 141, and the second valve port 142 to the four-way reversing valve 110. The second path flows sequentially through the second throttling element 1221 and the second heat exchanger 122 to the four-way reversing valve 110. Then, the refrigerant flows to the return port of the compressor 100 through the four-way reversing valve 110. When the opening degree of the first throttling element 1211 is greater than the opening degree of the second throttling element 1221, the temperature of the refrigerant flowing through the first heat exchanger 121 after throttling is higher. This allows the latent heat of the refrigerant to be used to defrost the first heat exchanger 121 while ensuring the overall heat exchange capacity of the outdoor heat exchanger 120.

[0052] Optionally, the air conditioning system has a fourth defrosting mode, which corresponds to: the first valve port 141 and the second valve port 142 being connected, the first on / off element 1511 being blocked, the second on / off element 1521 being blocked, and the opening degree of the second throttling element 1221 being greater than the opening degree of the first throttling element 1211.

[0053] In this embodiment, as Figure 4 As shown, the refrigerant discharged from the compressor 100 flows through the four-way reversing valve 110 to the indoor heat exchanger 130. The refrigerant flowing out of the indoor heat exchanger 130 has two flow paths: the first path flows sequentially through the first throttling element 1211, the first heat exchanger 121, the first valve port 141, and the second valve port 142 to the four-way reversing valve 110. The second path flows sequentially through the second throttling element 1221 and the second heat exchanger 122 to the four-way reversing valve 110. Then, the refrigerant flows through the four-way reversing valve 110 to the return port of the compressor 100. When the opening degree of the second throttling element 1221 is greater than that of the first throttling element 1211, the temperature of the refrigerant flowing through the second heat exchanger 122 after throttling is higher. This allows the latent heat of the refrigerant to be used to defrost the second heat exchanger 122, while also ensuring the overall heat exchange capacity of the outdoor heat exchanger 120.

[0054] Optionally, the air conditioning system has a first cooling mode, which corresponds to: the first valve port 141 and the second valve port 142 being connected, the first on / off element 1511 being blocked, the second on / off element 1521 being blocked, the first throttling element 1211 being throttled, and the second throttling element 1221 being throttled.

[0055] In this embodiment, the cooling frequency of the first cooling mode is F11, the cooling frequency of the second cooling mode is F12, and the cooling frequency of the third cooling mode is F13, where F11 > F12 > F13. Figure 5As shown, in the first refrigeration mode, due to the higher refrigeration frequency, the pressure loss has a more significant impact on the heat exchange and system energy efficiency. In this mode, the refrigerant flows in parallel through the first heat exchanger 121 and the second heat exchanger 122, which reduces pressure loss.

[0056] Optionally, the air conditioning system has a second cooling mode, which corresponds to: the first valve port 141 and the third valve port 143 being connected, the first on / off element 1511 being connected, the second on / off element 1521 being blocked, the first throttling element 1211 being throttled and the second throttling element 1221 being closed.

[0057] In this embodiment, as Figure 6 As shown, in the second cooling mode, due to the lower cooling frequency, the refrigerant flow rate has a more significant impact on the heat exchange and system energy efficiency. In this mode, the refrigerant flows in series between the first heat exchanger 121 and the second heat exchanger 122, which can increase the refrigerant flow rate.

[0058] Optionally, the air conditioning system has a third cooling mode, which corresponds to: the first valve port 141 and the third valve port 143 being connected, the first on / off element 1511 being blocked, the second on / off element 1521 being blocked, the first throttling element 1211 being closed and the second throttling element 1221 being throttled.

[0059] In this embodiment, under the third cooling mode, due to the low cooling frequency, the actual required heat exchange area is small, but the refrigerant charge of the air conditioning system is large. The mismatch between the charge and the heat exchange area affects the heat exchange capacity and system energy efficiency. At this time, with the first throttling element 1211 closed and the first on / off element 1511 blocked, the refrigerant in the first heat exchanger 121 can no longer circulate, thus reducing the overall heat exchange area of ​​the outdoor heat exchange device 120 and allowing the first heat exchanger 121 to temporarily store some refrigerant. Furthermore, by opening the first on / off element 1511 and closing the first throttling element 1211, some refrigerant from the main refrigerant circulation loop can enter the first heat exchanger 121 for storage. By opening the first throttling element 1211 and closing the first on / off element 1511, the refrigerant stored in the first heat exchanger 121 can flow out to the main refrigerant circulation loop. In this way, by adjusting the switching states of the first throttling element 1211 and the first on / off element 1511, the amount of refrigerant stored in the first heat exchanger 121 can be adjusted, thereby matching the amount of refrigerant in the main refrigerant circulation loop with the refrigeration frequency and heat exchange area.

[0060] Optionally, the air conditioning system has a first heating mode, which corresponds to: the first valve port 141 and the second valve port 142 being connected, the first on / off element 1511 being blocked, the second on / off element 1521 being blocked, the first throttling element 1211 throttling, and the second throttling element 1221 throttling.

[0061] In this embodiment, the heating frequency of the first heating mode is F21, the heating frequency of the second heating mode is F22, and the heating frequency of the third heating mode is F23, where F21 > F22 > F23. Figure 8 As shown, in the first heating mode, due to the higher heating frequency, the pressure loss has a more significant impact on the heat exchange and system energy efficiency. In this mode, the refrigerant flows in parallel through the first heat exchanger 121 and the second heat exchanger 122, which reduces pressure loss.

[0062] Optionally, the air conditioning system has a second heating mode, which corresponds to: the first valve port 141 and the third valve port 143 being connected, the first on / off element 1511 being connected, the second on / off element 1521 being blocked, the first throttling element 1211 being throttled and the second throttling element 1221 being closed.

[0063] In this embodiment, as Figure 9 As shown, in the second heating mode, due to the lower heating frequency, the refrigerant flow rate has a more significant impact on the heat exchange and system energy efficiency. In this mode, the refrigerant flows in series in the first heat exchanger 121 and the second heat exchanger 122, which can increase the refrigerant flow rate.

[0064] Optionally, the air conditioning system has a third heating mode, which corresponds to: the first valve port 141 and the third valve port 143 being connected, the first on / off element 1511 being blocked, the second on / off element 1521 being blocked, the first throttling element 1211 being closed, and the second throttling element 1221 being throttled.

[0065] In this embodiment, under the third heating mode, due to the low heating frequency, the actual required heat exchange area is small, but the refrigerant charge of the air conditioning system is large. The mismatch between the charge and the heat exchange area affects the heat exchange capacity and system energy efficiency. At this time, with the first throttling element 1211 closed and the first on / off element 1511 blocked, the refrigerant in the first heat exchanger 121 can no longer circulate, thus reducing the overall heat exchange area of ​​the outdoor heat exchange device 120 and allowing the first heat exchanger 121 to temporarily store some refrigerant. Furthermore, by opening the first on / off element 1511 and closing the first throttling element 1211, some refrigerant from the main refrigerant circulation loop can enter the first heat exchanger 121 for storage. By opening the first throttling element 1211 and closing the first on / off element 1511, the refrigerant stored in the first heat exchanger 121 can flow out to the main refrigerant circulation loop. In this way, by adjusting the switching states of the first throttling element 1211 and the first on / off element 1511, the amount of refrigerant stored in the first heat exchanger 121 can be adjusted, thereby matching the amount of refrigerant in the main refrigerant circulation loop with the heating frequency and heat exchange area.

[0066] Optionally, the first throttling element 1211 includes an electronic expansion valve. Optionally, the second throttling element 1221 includes an electronic expansion valve. The electronic expansion valve has better performance in terms of regulation accuracy and control response speed.

[0067] Optionally, the first on / off element 1511 includes a control valve. The second on / off element 1521 includes a control valve. The control valve has good performance in controlling the on / off state and flow rate of the corresponding bypass line.

[0068] Optionally, the indoor heat exchange device 130 includes a third heat exchanger 131.

[0069] This disclosure also provides a heat exchanger, such as... Figure 11 and Figure 12 As shown, the heat exchanger includes a casing 240, a heat exchange section 200, and a fan section 230. The casing 240 has an airflow channel. The heat exchange section 200 is disposed within the airflow channel and includes a first heat exchange module 210 located on the windward side and a second heat exchange module 220 located on the leeward side. Figure 13 As shown, the fan unit 230 is disposed within the airflow channel and is located downstream of the heat exchange unit 200 along the airflow direction. The surface of the first heat exchange module 210 is provided with a hydrophobic coating, and the surface of the second heat exchange module 220 is provided with a hydrophilic coating.

[0070] In this embodiment, during heat exchanger operation, the first heat exchange module 210 on the windward side comes into contact with the airflow first. When the temperature is low, water vapor in the airflow condenses on its surface to form water droplets, which then frost. The hydrophobic coating reduces the adhesion of water droplets, facilitating the sliding of water droplets off the first heat exchange module 210 and reducing frost formation. Simultaneously, since the fan unit 230 is located downstream of the heat exchange unit 200, condensed water droplets or defrost water on the heat exchange unit 200 are easily blown onto the fan unit 230 by the airflow, potentially causing the fan to blow water. The hydrophilic coating, however, has a stronger adhesion of water droplets. Water droplets sliding off the first heat exchange module 210 and blown onto the second heat exchange module 220, as well as condensed water droplets or defrost water on the second heat exchange module 220 itself, can be effectively adsorbed by the hydrophilic coating, thus reducing the problem of the fan blowing water.

[0071] Optionally, both the first heat exchange module 210 and the second heat exchange module 220 are finned heat exchange structures 213. For example... Figure 14 As shown, the first heat exchange module 210 includes a first heat exchange tube 211 and a first fin 212 sleeved on the first heat exchange tube 211, and the second heat exchange module 220 includes a second heat exchange tube 221 and a second fin 222 sleeved on the second heat exchange tube 221.

[0072] Optionally, the first heat exchange tube 211 and the second heat exchange tube 221 may have one or more structural features that differ in terms of tube diameter, number, length, wall thickness, surface structure, and material. This design difference in structural features between the first heat exchange tube 211 and the second heat exchange tube 221 is beneficial for improving the overall performance of the heat exchanger.

[0073] Optionally, the first fin 212 and the second fin 222 may have one or more structural features that differ in fin width, fin type, fin thickness, fin spacing, surface structure, and material. This design difference in structural features between the first fin 212 and the second fin 222 is beneficial for improving the overall performance of the heat exchanger.

[0074] Optionally, such as Figure 14 As shown, the width of the first fin 212 is w1, and the width of the second fin 222 is w2, where w1 > w2. In this embodiment, the first heat exchange module 210 on the windward side comes into contact with the airflow first, resulting in a larger heat exchange capacity; therefore, the first fin 212 is suitable for a larger width. The second heat exchange module 220 on the leeward side has a smaller heat exchange capacity; therefore, the second fin 222 is suitable for a narrower width, and a narrower fin also helps to reduce wind pressure loss on the leeward side.

[0075] Optionally, 15mm ≤ w1 ≤ 25mm. For example, the value of w1 can be 15mm, 17mm, 18mm, 21mm, 23mm or 25mm.

[0076] Optionally, 10mm ≤ w2 ≤ 18mm. For example, the value of w2 can be 10mm, 12mm, 13mm, 15mm, 17mm or 18mm.

[0077] Optionally, the first fin 212 is configured as a corrugated fin, and the second fin 222 is configured as a slit fin.

[0078] In this embodiment, corrugated fins refer to fins with a wavy, undulating surface. Since the first fin 212 is located on the windward side, using corrugated fins facilitates the rapid drainage of condensate and defrost water. Slit-type fins refer to fins with regular or irregular slit structures on their surface, such as bridge fins or louvers. Using slit-type fins for the second fin 222 helps improve heat exchange efficiency.

[0079] Optionally, such as Figure 14 As shown, the diameter of the first heat exchange tube 211 is d1, and the diameter of the second heat exchange tube 221 is d2, where d1 < d2. In this embodiment, using a smaller diameter for the first heat exchange tube 211 can improve heat exchange efficiency and reduce costs. Using a larger diameter for the second heat exchange tube 221 helps prevent excessive system pressure.

[0080] Optionally, 2mm ≤ d1 ≤ 8mm. For example, the value of d1 can be 2mm, 3mm, 5mm, 7mm or 8mm.

[0081] Optionally, 5mm ≤ d2 ≤ 10mm. For example, the value of d2 can be 5mm, 7mm, 8mm, 9 or 10mm.

[0082] Optionally, the number of first heat exchange tubes 211 is n1, and the number of second heat exchange tubes 221 is n2, where n1 > n2. In this embodiment, as... Figure 12 As shown, multiple first heat exchange tubes 211 are arranged vertically, and multiple second heat exchange tubes 221 are arranged vertically. The first heat exchange module 210 on the windward side comes into contact with the airflow first, and the heat exchange is relatively large, so a large number of first heat exchange tubes 211 are used.

[0083] Optionally, the surface of the second heat exchange module 220 has a first airflow zone and a second airflow zone, and the airflow of the first airflow zone is greater than the airflow of the second airflow zone. The number of second heat exchange tubes 221 corresponding to the first airflow zone is n21, and the number of second heat exchange tubes 221 corresponding to the second airflow zone is n22, where n21 > n22.

[0084] In this embodiment, the airflow decreases after passing through the first heat exchange module 210, and a first airflow zone with a larger airflow and a second airflow zone with a smaller airflow are formed on the surface of the second heat exchange module 220. To accommodate the difference in airflow, a larger number of second heat exchange tubes 221 are provided in the first airflow zone with a larger airflow, and a smaller number of second heat exchange tubes 221 are provided in the second airflow zone with a smaller airflow. This satisfies the heat exchange requirements while helping to reduce costs.

[0085] Optionally, such as Figure 15 As shown, the first heat exchange module 210 is constructed as a finned heat exchange structure 213. The second heat exchange module 220 is constructed as a microchannel heat exchange structure 214. In this embodiment, the first heat exchange module 210 includes a first heat exchange tube 211 and first fins 212 sleeved on the first heat exchange tube 211, which is beneficial to improving defrosting efficiency. The second heat exchange module 220 includes a microchannel flat tube, which is beneficial to improving heat exchange effect and reducing cost.

[0086] Optionally, the first heat exchange module 210 and the second heat exchange module 220 are connected in parallel or in series.

[0087] In some embodiments, the first heat exchanger 121 employs a heat exchanger with a hydrophobic coating and a hydrophilic coating as described in any of the above embodiments.

[0088] Optionally, the first end of the first heat exchange module 210 and the first end of the second heat exchange module 220 are connected in series, and in different defrosting modes, the refrigerant first flows through the first heat exchange module 210 and then through the second heat exchange module 220. The second end of the first heat exchange module 210 is provided with a first inlet / outlet pipe and a second inlet / outlet pipe, and the second end of the second heat exchange module 220 is provided with a third inlet / outlet pipe and a fourth inlet / outlet pipe. All four inlet / outlet pipes are controllably connected. The first inlet / outlet pipe is connected to the first throttling element 1211, and the third inlet / outlet pipe is connected to the first throttling element 1211. The second inlet / outlet pipe is connected to the first valve port 141, and the fourth inlet / outlet pipe is connected to the first valve port 141.

[0089] Optionally, in the first defrost mode, the first inlet / outlet pipe is blocked while the second inlet / outlet pipe is open, the third inlet / outlet pipe is open while the fourth open pipe is blocked. In this mode, the refrigerant first flows through the first heat exchange module 210 and then through the second heat exchange module 220. In the second, third, and fourth defrost modes, the first inlet / outlet pipe is open while the second inlet / outlet pipe is blocked, the third inlet / outlet pipe is blocked while the fourth open pipe is open. In this mode, the refrigerant still first flows through the first heat exchange module 210 and then through the second heat exchange module 220. Thus, due to the differentiated design of the first heat exchange module 210 and the second heat exchange module 220, defrost water can quickly slide off in all defrost modes, and the amount of water blown out by the fan can be reduced.

[0090] In some embodiments, the second heat exchanger 122 employs a heat exchanger with a hydrophobic coating and a hydrophilic coating as described in any of the above embodiments.

[0091] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A heat exchanger, characterized by, include: The casing (240) is equipped with an airflow channel; The heat exchange section (200) is disposed in the airflow channel and includes a first heat exchange module (210) located on the windward side and a second heat exchange module (220) located on the leeward side. The fan unit (230) is located in the airflow channel and downstream of the heat exchange unit (200) along the airflow direction; The surface of the first heat exchange module (210) is provided with a hydrophobic coating, and the surface of the second heat exchange module (220) is provided with a hydrophilic coating.

2. The heat exchanger according to claim 1, characterized in that, Both the first heat exchange module (210) and the second heat exchange module (220) are finned heat exchange structures (213). The first heat exchange module (210) includes a first heat exchange tube (211) and a first fin (212) sleeved on the first heat exchange tube (211). The second heat exchange module (220) includes a second heat exchange tube (221) and a second fin (222) sleeved on the second heat exchange tube (221). Among them, the first heat exchange tube (211) and the second heat exchange tube (221) have different structural features in terms of tube diameter, number, length, wall thickness, surface structure and material; and / or, the first fin (212) and the second fin (222) have different structural features in terms of fin width, fin type, fin thickness, fin spacing, surface structure and material.

3. The heat exchanger according to claim 2, characterized in that, The width of the first fin (212) is w1, and the width of the second fin (222) is w2, and w1 > w2.

4. The heat exchanger according to claim 3, characterized in that, 15mm≤w1≤25mm; and / or, 10mm≤w2≤18mm.

5. The heat exchanger according to any one of claims 2 to 4, characterized in that, The first fin (212) is constructed as a corrugated fin, and the second fin (222) is constructed as a slit fin.

6. The heat exchanger according to any one of claims 2 to 4, characterized in that, The diameter of the first heat exchange tube (211) is d1, and the diameter of the second heat exchange tube (221) is d2, and d1 < d2.

7. The heat exchanger according to claim 6, characterized in that, 2mm≤d1≤8mm; and / or, 5mm≤d2≤10mm.

8. The heat exchanger according to any one of claims 2 to 4, characterized in that, The number of first heat exchange tubes (211) is n1, the number of second heat exchange tubes (221) is n2, and n1 > n2; and / or, The surface of the second heat exchange module (220) has a first air volume area and a second air volume area, and the air volume of the first air volume area is greater than the air volume of the second air volume area; the number of second heat exchange tubes (221) corresponding to the first air volume area is n21, the number of second heat exchange tubes (221) corresponding to the second air volume area is n22, and n21 > n22.

9. The heat exchanger according to claim 1, characterized in that, The first heat exchange module (210) is constructed as a finned heat exchange structure (213); The second heat exchange module (220) is constructed as a microchannel heat exchange structure (214).

10. An air conditioning system, characterized in that, A heat exchanger comprising any one of claims 1 to 9.

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