Coil heat exchanger and heating, ventilation, and air conditioning device

Abstract

A coil heat exchanger and a heating, ventilation, and air conditioning device. The coil heat exchanger comprises a water manifold assembly and a heat exchange assembly, wherein a water inlet channel and a water outlet channel which are isolated from each other are formed in the water manifold assembly; and the heat exchange assembly comprises a plurality of coil tubes, each coil tube has a water inlet end and a water outlet end, the water inlet ends of the plurality of coil tubes are respectively connected to the water manifold assembly and respectively communicated with the water inlet channel, and the water outlet ends of the plurality of coil tubes are respectively connected to the water manifold assembly and respectively communicated with the water outlet channel.

Description

Coil heat exchangers and HVAC equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410378110.5, filed on March 29, 2024, entitled “Coil Heat Exchanger and HVAC Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field related to HVAC components, and in particular to a coil heat exchanger and HVAC equipment. Background Art

[0004] At present, the main water distribution and collection scheme of fan coil units is: the water inlet pipe of the main system is connected to the water distribution joint, and water enters the water distribution joint from the water inlet pipe; the water distribution joint is connected to the water inlet branch pipes of each branch, and water is diverted to each water inlet branch pipe through the water distribution joint; each water inlet branch pipe is connected to the heat exchange pipe of each branch, and water flows from each branch pipe into the heat exchange pipe corresponding to each flow path; each water outlet branch pipe is connected to the heat exchange pipe of each flow path and is connected to the water collection joint, and water flows out of the heat exchange pipe through each water outlet branch pipe and is collected at the water collection joint; the water collection joint is connected to the water outlet pipe of the main system, and water flows into the water outlet pipe of the main system through the water collection joint and returns to the main system. Summary of the Invention

[0005] The purpose of this application is to at least alleviate the problem of complex structure and low assembly efficiency of water distribution and collection components. This purpose is achieved through the following technical solutions:

[0006] The first aspect of the present application proposes a coil heat exchanger, including a water distribution assembly and a heat exchange assembly, wherein the water distribution assembly has a water inlet channel and a water outlet channel that are isolated from each other; the heat exchange assembly includes fins and multiple coils, each coil has a water inlet end and a water outlet end, the water inlet ends of the multiple coils are respectively connected to the water distribution assembly and respectively communicated with the water inlet channel, and the water outlet ends of the multiple coils are respectively connected to the water distribution assembly and respectively communicated with the water outlet channel, and the fins are connected to the coils.

[0007] According to the coil heat exchanger of the present application, the water inlets of the multiple coils of the heat exchange assembly are connected through the water inlet channel, the water outlets of the multiple coils are connected through the water outlet channel, and the water inlet channel and the water outlet channel are integrated on the water distribution assembly. The coil heat exchanger has a simple structure, fewer parts, and is easy to assemble, which improves the processing and assembly efficiency of the coil heat exchanger and reduces production costs.

[0008] In addition, the coil heat exchanger according to the present application may also have the following additional technical features:

[0009] In some embodiments of the present application, the water distribution assembly includes a shell, which has a accommodating cavity, the water inlet channel and the water outlet channel are formed in the accommodating cavity, the shell is arranged at one end of the heat exchange assembly, and a plurality of connecting ports are spaced apart on the side wall of the shell facing the heat exchange assembly, the coil is sealed and connected to the connecting port, and is connected to the accommodating cavity through the connecting port.

[0010] In some embodiments of the present application, the multiple connecting ports include a plurality of first connecting ports arranged at intervals and a plurality of second connecting ports arranged at intervals, all of the first connecting ports correspond to the positions of the water inlet channel and are connected to the water inlet channel, the water inlet end of the coil is sealed and connected to the first connecting port, all of the second connecting ports correspond to the positions of the water outlet channel and are connected to the water outlet channel, and the water outlet end of the coil is sealed and connected to the second connecting port.

[0011] In some embodiments of the present application, the water inlet ends of the plurality of coils are sealed and connected to the first connecting port in a one-to-one correspondence, and the water outlet ends of the plurality of coils are sealed and connected to the second connecting port in a one-to-one correspondence.

[0012] In some embodiments of the present application, a first water return structure is further provided in the shell, and at least one of the multiple coils is a first coil. Each of the first coils includes a first heat exchange tube and a second heat exchange tube. The outlet of the first heat exchange tube and the inlet of the second heat exchange tube are both arranged toward the distribution and collection assembly. In the same first coil, the outlet of the first heat exchange tube and the inlet of the second heat exchange tube are connected through the first water return structure, so that the first heat exchange tube and the second heat exchange tube are connected in series.

[0013] In some embodiments of the present application, the water inlet channel and the water outlet channel are respectively arranged on both sides of the first water return structure.

[0014] In some embodiments of the present application, a accommodating cavity is formed in the shell, and the first water return structure is connected to the inner wall surface of the shell, and divides the accommodating cavity into the water outlet channel and the water inlet channel.

[0015] In some embodiments of the present application, the first water return structure is provided with a reflux channel, at least two of the plurality of coils are first coils, and at least two of the first heat exchange tubes are connected to the corresponding second heat exchange tubes through the same reflux channel.

[0016] In some embodiments of the present application, there are at least two first coils among the multiple coils, the first return water structure is provided with multiple reflux channels, and the reflux channels are provided one-to-one between all the first heat exchange tubes and the corresponding second heat exchange tubes.

[0017] In some embodiments of the present application, the first water return structure includes a plurality of protrusions arranged at intervals, adjacent protrusions are connected by partitions, the protrusions and the partitions are both connected to the inner wall surface of the shell, and each protrusion is provided with the return channel.

[0018] In some embodiments of the present application, the first water return structure is an integrated structure;

[0019] And / or, the first water return structure and the shell are an integrally formed structure or a split assembly structure.

[0020] In some embodiments of the present application, the shell includes a shell body and a sealing plate, the shell body is provided with a first opening on the side facing the heat exchange component, the shell body has a first groove and a second groove isolated from each other, the orientation of the notch of the first groove and the orientation of the notch of the second groove are consistent with the orientation of the first opening, the sealing plate is sealed to the first opening, and is enclosed with the first groove to form the water inlet channel, and is enclosed with the second groove to form the water outlet channel, and all the connecting ports are provided on the sealing plate.

[0021] In some embodiments of the present application, the heat exchange assembly further includes a shell, and the sealing plate is connected to an end surface of the shell.

[0022] In some embodiments of the present application, an end plate is provided at one end of the shell, and the sealing plate is connected to the end surface of the shell through the end plate.

[0023] In some embodiments of the present application, the shell body is an integral structure;

[0024] And / or, the sealing plate is an integral structure.

[0025] In some embodiments of the present application, the water distribution assembly further includes a sealing gasket, which is sealingly disposed between the sealing plate and the shell body.

[0026] In some embodiments of the present application, the sealing gasket covers the first opening, and the sealing gasket is provided with multiple through-holes, which correspond one-to-one with the connecting port and are coaxially arranged. The coil passes through the connecting port and is sealed and connected to the through-hole.

[0027] In some embodiments of the present application, the sealing gasket is provided with multiple first through-holes corresponding to the position of the water inlet channel, and the sealing gasket is provided with multiple second through-holes corresponding to the position of the water outlet channel. The multiple first through-holes correspond one-to-one with the multiple first connecting ports and are coaxially arranged. The water inlet ends of the multiple coils pass through the first connecting ports one-to-one and are sealed with the first through-holes. The multiple second through-holes correspond one-to-one with the multiple second connecting ports and are coaxially arranged. The water outlet ends of the multiple coils all pass through the second connecting ports one-to-one and are sealed with the second connecting ports.

[0028] In some embodiments of the present application, the plurality of coils are connected to the sealing gasket and the sealing plate by expansion joints.

[0029] In some embodiments of the present application, the water distribution assembly further includes an inlet joint and an outlet joint, both of which are connected to the shell body, the inlet joint is connected to the water inlet channel, and the outlet joint is connected to the water outlet channel.

[0030] In some embodiments of the present application, the water inlet connector and the shell body are an integral structure;

[0031] And / or, the water outlet joint and the shell body are an integral structure.

[0032] In some embodiments of the present application, the water distribution assembly further includes an exhaust assembly, the exhaust assembly is in communication with the water outlet channel, and the water outlet connector and / or the housing are connected to the exhaust assembly;

[0033] And / or, the water distribution and collection assembly further includes a drainage assembly, the drainage assembly is communicated with the water inlet channel, and the drainage assembly is connected to the water inlet joint and / or the shell.

[0034] A second aspect of the present application proposes a HVAC device, comprising a fan and a coil heat exchanger proposed in the present application or any embodiment of the present application, wherein the fan is arranged on one side of the coil heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a schematic structural diagram of a coil heat exchanger according to some embodiments of the present application;

[0036] Figure 2 is a split schematic diagram of Figure 1;

[0037] FIG3 is a schematic diagram of FIG2 from another perspective;

[0038] FIG4 is a schematic diagram of a partial flow path of the coil heat exchanger shown in FIG3 ;

[0039] FIG5 is a split schematic diagram of a coil heat exchanger according to some embodiments of the present application;

[0040] FIG6 is a schematic diagram of a partial flow path of the coil heat exchanger shown in FIG5 ;

[0041] FIG7 is a split schematic diagram of a coil heat exchanger according to some embodiments of the present application;

[0042] FIG8 is a schematic diagram showing the flow path of the coil heat exchanger shown in FIG7 ;

[0043] FIG9 is a split schematic diagram of a coil heat exchanger according to some embodiments of the present application;

[0044] FIG10 is a schematic diagram showing the flow path of the coil heat exchanger shown in FIG9 ;

[0045] FIG11 is a split schematic diagram of a coil heat exchanger provided in some embodiments of the present application;

[0046] FIG12 is a split schematic diagram of a coil heat exchanger provided in some embodiments of the present application;

[0047] FIG13 is a schematic structural diagram of a coil heat exchanger provided in some embodiments of the present application;

[0048] FIG14 is a partial enlarged view of FIG13;

[0049] FIG15 is a schematic diagram of an interference seal between a sealing plate and a coil of a coil heat exchanger provided by some embodiments of the present application;

[0050] FIG16 is a schematic diagram of a coil heat exchanger provided by some embodiments of the present application, wherein a sealing plate and a coil are sealed by a sealing ring;

[0051] FIG17 is a schematic diagram of a coil heat exchanger provided by some embodiments of the present application, wherein a sealing plate and a coil are sealed by a sealing gasket;

[0052] FIG18 is an enlarged view of the T portion of FIG17 ;

[0053] FIG19 is a split schematic diagram of the coil heat exchanger shown in FIG17 ;

[0054] FIG20 is a schematic diagram of the shell body, water inlet connector, and water outlet connector of a coil heat exchanger according to some embodiments of the present application;

[0055] FIG21 is a schematic diagram of the shell body shown in FIG20 from another perspective;

[0056] FIG22 is a partial cross-sectional view of the assembled shell, water inlet and outlet joints of the coil heat exchanger shown in FIG20 ;

[0057] FIG23 is a schematic diagram of the shell body, water inlet connector, and water outlet connector of a coil heat exchanger provided in some embodiments of the present application;

[0058] FIG24 is a schematic diagram of the circumferential frame shown in FIG23 from another perspective;

[0059] FIG25 is a schematic diagram of the shell body, the first water return structure, the water inlet connector, and the water outlet connector of the coil heat exchanger provided in some embodiments of the present application;

[0060] FIG26 is a schematic diagram of the shell body and the first water return structure shown in FIG25 from another perspective;

[0061] FIG27 is a split schematic diagram of a coil heat exchanger provided in some embodiments of the present application;

[0062] FIG28 is a schematic diagram of the assembly of a coil heat exchanger and a fan according to some embodiments of the present application.

[0063] The figures are marked as follows: 10, coil heat exchanger; 100, water distribution assembly; 101, water inlet channel; 102, water outlet channel; 110, shell; 111, shell body; 1111, first opening; 1112, top plate; 1113, circumferential frame; 1114, water inlet through hole; 1115, water outlet through hole; 1116, sealing connection; 1117, accommodating cavity; 112, sealing plate; 1121, flange; 1122, sealing connection surface; 1123, solder; 1124, sealing ring; 113, first groove; 114, second groove; 115, first connecting port; 116, second connecting port; 117, third connecting port 118, connecting port; 120, first water return structure; 121, reflux channel; 1211, first reflux channel; 1212, second reflux channel; 122, bump; 123, partition; 124, isolation plate; 130, sealing gasket; 131, first through-port; 132, second through-port; 133, third through-port; 134, through-port; 140, water inlet connector; 150, water outlet connector; 160, exhaust assembly; 170, drainage assembly; 200, heat exchange assembly; 210, coil; 201, first long U-shaped tube; 202, second long U-shaped tube; 203, third long U-shaped tube; 211, water inlet; 212, water outlet; 220, first coil; 221, first heat exchange tube; 222, second heat exchange tube; 230, housing; 231, air outlet; 232, end plate; 240, fin; 20, fan; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0064] The following describes exemplary embodiments of the present application in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0065] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0066] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0067] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped over, an element described as "below" or "beneath" another element or feature would then be oriented "above" or "above" the other element or feature. Thus, the example term "below" can encompass both above and below orientations.

[0068] Currently, the main water distribution and collection scheme for coil heat exchangers is as follows: the main system's water inlet pipe is connected to a water distribution joint, and water enters the water distribution joint from the water inlet pipe; the water distribution joint is connected to the water inlet branches of each branch, and water is diverted to each water inlet branch through the water distribution joint; each water inlet branch is connected to the heat exchange tube of each branch, and water flows from each branch into the heat exchange tube of the corresponding flow path; each water outlet branch is connected to the heat exchange tube of each flow path and connected to a water collection joint, and water flows from the heat exchange tube through each water outlet branch and is then collected at the water collection joint; the water collection joint is connected to the main system's water outlet pipe, and water flows through the water collection joint into the main system's water outlet pipe and returns to the main system. The total number of parts of the water distribution and collection components is large, the structure is relatively complex, and the assembly efficiency is low.

[0069] To alleviate the aforementioned problems, as shown in Figures 1 to 28 , according to an embodiment of the present application, a coil heat exchanger 10 is proposed, comprising a manifold assembly 100 and a heat exchange assembly 200. The manifold assembly 100 includes an inlet channel 101 and an outlet channel 102, with the outlet channel 102 being isolated from the inlet channel 101. The heat exchange component 200 includes multiple coils 210, each coil 210 has a water inlet end 211 and a water outlet end 212, the pipe opening on the water inlet end 211 is the water inlet, and the pipe opening on the water outlet end 212 is the water outlet, the sub-collection component 100 is connected to the water inlet end 211 of each coil 210, and the water inlet of each coil 210 is connected to the water inlet channel 101 of the sub-collection component 100, the sub-collection component 100 is also connected to the water outlet end 212 of each coil 210, and the water outlet of each coil 210 is connected to the water outlet channel 102 of the sub-collection component 100.

[0070] The coil heat exchanger 10 is usually used in conjunction with a fan 20. The fan 20 can be set on one side of the coil heat exchanger 10. The fan 20 is used to drive the air flow so that the air flow flows through the coil heat exchanger 10. When the air flow flows through the coil heat exchanger 10, the air flow exchanges heat with the water in the coil heat exchanger 10.

[0071] The heat exchange assembly 200 is the main component for performing heat exchange. Specifically, the heat exchange assembly 200 performs heat exchange between water flowing within the heat exchange assembly 200 and a medium such as air outside the heat exchange assembly 200. The multiple coils 210 refer to two or more coils 210. Each coil 210 can be understood as a set of pipes flowing from the water inlet channel 101 to the water outlet channel 102. Each coil 210 can have one, two, or more water inlets, and each set of coils 210 can also have one, two, or more water outlets. For example, in some embodiments, at least one coil 210 has a single water inlet pipe and multiple water outlet pipes, and the multiple outlet pipes are all connected to and communicate with the water inlet pipe. Among them, each coil 210 has at least one bend and reflux. Simply put, each coil 210 includes at least two heat exchange sections, and the water flow directions of the two heat exchange sections are roughly opposite. More specifically, it can be understood that each coil 210 includes at least one long U-shaped tube.

[0072] The water distribution assembly 100 may include a housing 110, wherein the water inlet channel 101 and the water outlet channel 102 are both disposed within the housing 110, and the water inlet channel 101 and the water outlet channel 102 are independent channels. The water distribution assembly 100 may be provided with a water inlet connector 140 and a water outlet connector 150, wherein the water inlet connector 140 may be connected to the portion of the water distribution assembly 100 that forms the water inlet channel 101 and communicates with the water inlet channel 101, and the water outlet of the heat exchange water supply system is connected to the water inlet connector 140 and supplies water to the water inlet channel 101 through the water inlet connector 140; the water outlet connector 150 may be connected to the portion of the water distribution assembly 100 that forms the water outlet channel 102 and communicates with the water outlet channel 102, and the water inlet of the heat exchange water supply system is connected to the water outlet connector 150, and the water flow in the heat exchange assembly 200 flows back to the heat exchange water supply system through the water outlet connector 150. The heat exchange water supply system is used to heat or cool the water flow. When the heat exchange component 200 is used to provide heating for the environment, the heat exchange water supply system heats the water flow to provide hot water to the heat exchange component 200. The heat exchange water supply system can specifically be provided with a heating device, such as a gas heating device, an electric heating pipe, etc., to heat the water flow; when the heat exchange component 200 is used to provide cooling for the environment, the heat exchange water supply system can cool the water flow. The heat exchange water supply system can specifically be provided with a cooling device, such as an evaporator, etc., to cool the water flow.

[0073] The water collection assembly 100 can be provided with multiple first connecting ports 115 corresponding to the water inlet channel 101. The multiple first connecting ports 115 are connected to the water inlet ends 211 in the multiple coils 210. Specifically, one first connecting port 115 can be connected to the water inlet end 211 in one coil 210. Specifically, the water inlet end 211 in the coil 210 can be plugged and sealed with the first connecting port 115. For example, the water inlet end 211 in the coil 210 can be inserted into the first connecting port 115 and sealed with the first connecting port 115. The water distribution and collection assembly 100 may be provided with a plurality of second communication ports 116 corresponding to the water outlet channel 102. The plurality of second communication ports 116 are connected to the water outlet ends 212 of the plurality of coils 210. Specifically, one second communication port 116 is connected to the water outlet end 212 of one coil 210. Specifically, the water outlet end 212 of the coil 210 may be plugged and sealedly connected to the second communication port 116. For example, the water outlet end 212 of the coil 210 may be inserted into the second communication port 116 and sealedly connected to the second communication port 116. After the water for heat exchange flows into the water inlet channel 101, it is divided through the water inlet channel 101 to the water inlet end 211 of each coil 210. Then, after flowing through each coil 210, it is collected at the water outlet end 212 of each coil 210 and flows out through the water outlet channel 102. The water exchanges heat with the air when flowing through each coil 210 .

[0074] In the coil heat exchanger 10 of this embodiment, the water inlets of the multiple coils 210 of the heat exchange assembly 200 are all connected through the water inlet channel 101, and the water outlets of the multiple coils 210 are all connected through the water outlet channel 102. The water inlet channel 101 and the water outlet channel 102 are integrated into the water distribution assembly 100. The heat exchanger has a simple structure, fewer parts, and is easy to assemble, which improves the processing and assembly efficiency of the coil heat exchanger 10 and reduces production costs.

[0075] In some technologies, the coil heat exchanger is connected to multiple branch pipes through a water distribution joint, and the multiple branch pipes are connected to the water inlet of the heat exchange tube. At the same time, the water collection joint is connected to the multiple branch pipes, and the heat exchange tube is connected to the water collection joint through the branch pipe to realize the collection and distribution of water in multiple heat exchange tubes. The water diversion joint, water collection joint, and branch pipes are independent components. Therefore, assembly is required between the water diversion joint and the branch pipes to which it is connected, between the water outlet structure and the branch pipes to which it is connected, between the branch pipes and the inlet of the heat exchange tubes, and between the branch pipes and the outlet of the heat exchange tubes. This results in a large number of parts, and the structural assembly process is cumbersome, time-consuming, and labor-intensive, significantly impacting the production cost of the coil heat exchanger. Furthermore, the water inlet assembly (the water diversion joint and the corresponding branch pipes form the water inlet assembly) and the water outlet assembly (the water collection joint and the corresponding branch pipes form the water outlet assembly) are welded and assembled separately, making them susceptible to deformation. Therefore, additional mounting plates are required for securing them. The water diversion joint and water collection joint are typically disc-shaped, which is smaller than the layout range of the inlets and outlets of multiple heat exchange tubes. Therefore, the branch pipes are mostly long, curved branches that occupy a large amount of space. Furthermore, due to the large number of dispersed parts, the water diversion and collection assembly occupies a large amount of ineffective space, resulting in a cluttered and aesthetically pleasing design that is not conducive to the integrated design of the coil heat exchanger. The water flowing into the heat exchange tube needs to flow through the branch pipe before entering the heat exchange tube after flowing out of the water collecting joint, and the water flowing out of the heat exchange tube also needs to pass through the branch pipe before flowing back. The heat exchange component has a long pipe path and large water resistance.

[0076] In the coil heat exchanger 10 of this embodiment, the inlet end of the coil 210 is directly connected to the water distribution and collection assembly 100, and the outlet end of the coil 210 is also directly connected to the water distribution and collection assembly 100, eliminating the need for branch pipes. This results in a simple structure, convenient assembly, a shorter water flow path, and reduced water resistance, which is beneficial for improving heat exchange efficiency. Furthermore, the water distribution and collection assembly 100 integrates the water inlet channel 101 and the water outlet channel 102, eliminating the need for separate, scattered water distribution and collection joints. This reduces the number of parts and prevents deformation of the components, facilitating the orderly arrangement of the water distribution and collection assembly 100, reducing the clutter of parts, and reducing the ineffective space occupied by parts, thereby improving the integration and aesthetics of the coil heat exchanger 100.

[0077] In some embodiments, fins 240 may be provided on the outside of the coil 210 of the heat exchange assembly 200. In other words, the coil heat exchanger 10 may be a fin-tube heat exchanger. The coil 210 exchanges heat with the airflow through the fins 240, thereby improving the heat exchange efficiency of the heat exchanger. The fins 240 may be connected to the coil 210 through expansion joints, welding, or other methods. In some implementations, the fins 240 are provided with mounting holes, and the coil 210 is inserted into the mounting holes so that the fins 240 are sleeved and connected to the coil 210. There may be multiple fins 240, and the multiple fins 240 may be arranged at intervals. For example, the multiple fins 240 may be arranged at intervals along the first direction X on the coil 210.

[0078] Optionally, the heat exchange assembly 200 may further include a housing 230, with the plurality of coils 210 disposed within the housing 230. An air inlet is disposed on one side surface of the housing 230 (defined as a first side surface for ease of description), and an air outlet 231 is disposed on a side surface of the housing 230 opposite the air inlet (defined as a second side surface for ease of description). The water distribution assembly 100 may be disposed on an end surface of the housing 230, wherein the end surface of the housing 230 is perpendicular to the first side surface of the housing 230.

[0079] It should be noted that the first side surface can be partially hollowed out to form an air inlet, or the first side surface can be completely hollowed out, that is, the housing 230 has no sidewalls on the first side surface to form the air inlet; the second side surface can be partially hollowed out to form an air outlet 231, or the second side surface can be completely hollowed out, that is, the housing 230 has no sidewalls on the second side surface to form the air outlet 231. In Figure 28, the second side surface is completely hollowed out to form the air outlet 231. To simplify the drawing, Figure 28 only shows the actual structure of the coil heat exchanger 10 at a partial position on the second side surface, and does not illustrate the entire internal structure of the coil heat exchanger.

[0080] The housing 230 can be a roughly rectangular parallelepiped structure. The air inlet and outlet 231 can also be provided on two adjacent side surfaces of the housing 230. The end surface of the housing 230 used for connection to the water distribution assembly 100 can be hollowed out, that is, this end surface of the housing 230 can be an open structure. For ease of description, this is defined as a second opening. The water distribution assembly 100 is connected to the side surface of the housing 230 and fixed to the second opening of the end surface of the housing 230. In other words, the housing 230 and the water distribution assembly 100 can be fixedly connected, and the water distribution assembly 100 serves as the end wall of the housing 230. The end surface of the housing 230 can also be a solid structure.

[0081] The processes of the multiple coils 210 can be set to be the same or different. The coil 210 can include at least two heat exchange sections, and the multiple heat exchange sections are arranged in series in sequence. Each heat exchange section can be one heat exchange tube or multiple heat exchange tubes. When any heat exchange section has multiple heat exchange tubes, the multiple heat exchange tubes are arranged in parallel. That is to say, along the direction of water flow, the number of heat exchange tubes can be different at different positions. For example, the outlet of one water inlet pipe can be connected to multiple water outlet pipes, or the outlets of multiple water inlet pipes can be connected to the same water inlet pipe, or one water inlet pipe can be connected to one water outlet pipe, etc. All heat exchange tubes in the multiple heat exchange sections can be roughly the same length, and the two ends of all heat exchange tubes are roughly aligned, forming a coil 210 structure that bends and folds in sequence.

[0082] In one implementation, as shown in Figures 1 and 2, any heat exchange tube of the multiple heat exchange sections is arranged along the first direction X, the first ends of all the heat exchange tubes along the first direction X can be roughly aligned, the second ends of all the heat exchange tubes along the first direction X are roughly aligned, and the multiple heat exchange tubes are arranged at intervals along the second direction Y and the third direction Z. The water collection assembly 100 is arranged at the first end of the heat exchange tube along the first direction X. Among the multiple heat exchange tubes, the first ends of the heat exchange tubes of the first heat exchange section are all connected to the water inlet channel 101 of the water collection assembly 100. As shown in Figures 3 to 10, the water flowing into the water inlet channel 101 flows along the path B from the water inlet channel 101 to the first ends of the multiple heat exchange tubes of the first heat exchange section, and then flows through the multiple heat exchange tubes of the first heat exchange section along the first direction X to the second end, and enters the heat exchange tubes of the second heat exchange section from the second ends of the multiple heat exchange tubes of the first heat exchange section, and then flows back from the heat exchange tubes of the second heat exchange section along the opposite direction of the first direction X to the first ends of the heat exchange tubes of the second heat exchange section, forming a primary reflux. In some embodiments, as shown in FIG7 , the process of the heat exchange assembly 200 is relatively short, the first end of the second heat exchange section is connected to the water outlet channel 102, and the water flows along the path D through the first end of the heat exchange tube of the second heat exchange section and returns to the water outlet channel 102. That is, the water flows through a long U-shaped tube. This process can also be understood with reference to the water flow path A4 in FIG8 . In other embodiments, as shown in Figures 9 and 10, the process of the heat exchange component 200 is longer, and the first end of the second heat exchange section can be connected to the first end of the third heat exchange section. The water flows along the path C in Figure 9 through the first end of the heat exchange tube of the second heat exchange section into the first end of the heat exchange tube of the third heat exchange section, and then flows from the heat exchange tube of the third heat exchange section along the first direction X to the second end of the heat exchange tube of the third heat exchange section, and then flows back to the first end through the fourth heat exchange section, forming a second reflux. The first end of the fourth heat exchange section can be connected to the water outlet channel 102, and the water flows along the path D in Figure 9 through the first end of the heat exchange tube of the fourth heat exchange section to the water outlet channel 102; that is, the water flows through two long U-shaped tubes (flowing through the first long U-shaped tube 201 and the second long U-shaped tube 202 in sequence). This process can also be understood with reference to the water flow path A5 in Figure 11.Each coil 210 or part of the coil 210 may also include 6 or more even-numbered heat exchange sections (i.e., three long U-shaped tubes or more long U-shaped tubes) to form more refluxes. The specific arrangement may refer to the circulation arrangement of the first section and the fourth section. Taking the arrangement of three long U-shaped tubes in each coil 210 as an example, as shown in FIG3 , the water flowing out of the first long U-shaped tube 201 flows out of the first long U-shaped tube 201 along path C1 and flows through the first reflux channel 1211 before flowing to the second long U-shaped tube 202. The water flowing out of the second long U-shaped tube 202 flows out of the second long U-shaped tube 202 along path C2 and flows through the second reflux channel 1212 before flowing to the third long U-shaped tube 203. The water flowing out of the second long U-shaped tube 202 flows back to the water outlet channel 102 along path D shown in FIG3 . This water flow process may also refer to the water flow path A2 shown in FIG4 .

[0083] A single reflux is a single flow path. Specifically, a single reflux refers to a single, folded flow path where the water flows from the first end to the second end and then back from the second end to the first end. A double reflux refers to a flow path where the water needs to traverse these two folded flows. Similarly, three or more refluxes refer to a flow path where the water needs to traverse a corresponding number of folded flows. The first direction X can be the length of the heat exchange component, the second direction Y can be the width of the heat exchange component, and the third direction Z can be the height of the heat exchange component. The first direction X, the second direction Y, and the third direction Z can be arranged perpendicular to each other.

[0084] Along the water flow direction, the heat exchange tubes connected at the second end of each coil 210 can be connected through a joint, that is, at the second end, the outlet of the upstream heat exchange tube and the inlet of the downstream heat exchange tube can be connected through a joint. When the upstream heat exchange tube and the downstream heat exchange tube are both one heat exchange tube, the two can be connected through a U-shaped joint. The joint and the two heat exchange tubes can be an integral structure, such as a long U-shaped tube structure welded into one, or a long U-shaped tube structure injection molded into one, etc. The heat exchange tubes are connected as a whole at the second end, which is equivalent to a long U-shaped tube with an integral structure for a reflux. When two or more refluxes are formed, it is equivalent to two or more long U-tubes, in which the outlet of the upstream long U-shaped tube and the inlet of the downstream long U-shaped tube are connected and connected at the first end, and the U-shaped connection part of each long U-shaped tube is located at the second end.

[0085] It should be noted that the connection at the second end of each coil 210 can also be achieved by providing an integrated second water return structure. The second water return structure is provided at the second end of the heat exchange assembly 200 along the first direction X. The second water return structure can be provided with a water return cavity, and the second end of the upstream heat exchange tube and the second end of the adjacent downstream heat exchange tube along the water flow direction are both connected to the water return cavity. Multiple coils 210 can share a second water return structure. Specifically, multiple water return cavities can be provided on the second water return structure, and the second ends of two adjacent sections of heat exchange tubes in the same coil 210 can be connected through a water return cavity. In one reflux, when the pressures at the second ends of multiple coils 210 are the same, in the same reflux, the second ends of adjacent heat exchange tubes of multiple coils 210 can share a water return cavity. For example, all coils 210 include one reflux, and the second water return structure can be provided with a water return cavity. The second ends of the first heat exchange sections of all coils 210 are connected to the second ends of the second heat exchange sections through the water return cavity. For another example, all coils 210 include two refluxes. The second water return structure can be provided with two spaced and independent water return cavities. The second ends of the first heat exchange sections of all coils 210 are connected to the second ends of the second heat exchange sections through one of the water return cavities. The second ends of the third heat exchange sections of all coils 210 are connected to the second ends of the fourth heat exchange sections through the other water return cavity.

[0086] It should be noted that, in this embodiment, unless otherwise specified, each coil 210 is formed by a long U-shaped tube or multiple long U-shaped tubes are connected in sequence as an example, and the inlet and outlet ends of the long U-shaped tube are both located at the first end of the heat exchange component 200 for illustration, wherein the number of reflux times of the coil 210 is consistent with the number of U-shaped tubes. For example, as shown in Figures 7 and 8, when there is one reflux, each coil 210 only needs one U-shaped tube, and the two parallel sides of the U-shaped tube form the first heat exchange section and the second heat exchange section of the coil 210; for another example, in Figures 9 and 10, when there are two refluxes, each coil 210 includes two U-shaped tubes, the outlet of the first long U-shaped tube 201 and the inlet of the second long U-shaped tube 202 are connected and communicated at the first end, the two parallel sides of the first long U-shaped tube 201 form the first heat exchange section and the second heat exchange section of the coil 210, and the two parallel sides of the second long U-shaped tube 202 form the third heat exchange section and the fourth heat exchange section of the coil 210. For another example, as shown in Figures 3 and 4, when there are two refluxes, each coil 210 includes three U-shaped tubes, the outlet of the first long U-shaped tube 201 is connected and communicated with the inlet of the second long U-shaped tube 202 at the first end, the outlet of the second long U-shaped tube 202 is connected and communicated with the inlet of the third long U-shaped tube 203 at the first end, the two parallel sides of the first long U-shaped tube 201 form the first heat exchange section and the second heat exchange section of the coil 210, the two parallel sides of the second long U-shaped tube 202 form the third heat exchange section and the fourth heat exchange section of the coil 210, and the two parallel sides of the third long U-shaped tube 203 form the fifth heat exchange section and the sixth heat exchange section of the coil 210.

[0087] When the coil 210 has two or more reflows, along the water flow direction, the first end of the upstream heat exchange section and the first end of the downstream heat exchange section can be connected by an additional joint, such as a semicircular or U-shaped joint. In some embodiments, a first return water structure 120 can also be provided on the water distribution assembly 100 to connect the first end of the upstream heat exchange section and the first end of the downstream heat exchange section through the first return water structure 120.

[0088] It should be noted that the upstream and downstream in the coil 210 are defined with reference to the direction of water flow, wherein, along the direction of water flow, the part close to the inlet is the upstream, and the part close to the outlet is the downstream, that is, the water flows from upstream to downstream.

[0089] In one embodiment, a first return water structure 120 is further provided in the sub-collection assembly 100, and at least one coil 210 among the multiple coils 210 is a first coil 220. Each first coil 220 includes a first heat exchange tube 221 and a second heat exchange tube 222. The first heat exchange tube 221 and the second heat exchange tube 222 are arranged in parallel, and the outlet of the first heat exchange tube 221 and the inlet of the second heat exchange tube 222 are both arranged toward the first end of the sub-collection assembly 100. In the same first coil 220, the outlet of the first heat exchange tube 221 and the inlet of the second heat exchange tube 222 are connected through the first return water structure 120, so that the first heat exchange tube 221 and the second heat exchange tube 222 are connected in series.

[0090] The water inlet channel 101 can be disposed on one side of the first water return structure 120, and the water outlet channel 102 can be disposed on the other side of the first water return structure 120. In other words, the first water return structure 120 is disposed between the water inlet channel 101 and the water outlet channel 102, and isolates the water inlet channel 101 from the water outlet channel 102. Specifically, in one implementation, the water distribution assembly 100 is formed with a receiving chamber 1117, and the first water return structure 120 is disposed in the receiving chamber 1117, and the first water return structure 120 separates the receiving chamber 1117 into the water outlet channel 102 and the water inlet channel 101.

[0091] It can be understood that, for a first coil 220, the water inlet of the first coil 220 can be connected to the inlet of the first heat exchange tube 221 in the first coil 220, the outlet of the first heat exchange tube 221 can be connected to the inlet of the second heat exchange tube 222 of the first coil 220 through the first return water structure 120, and the outlet of the second heat exchange tube 222 is connected to the water outlet of the first coil 220 of the first coil 220.

[0092] The first coil 220 is actually a coil 210 with two or more recirculations. Some of the coils 210 can be configured as the first coil 220, while others can be configured as coils 210 with only one recirculation. Alternatively, all coils 210 can be configured as the first coil 220.

[0093] The first heat exchange tube 221 and the second heat exchange tube 222 can be understood as two heat exchange tubes that are interconnected and communicated at the first ends in the first direction X. For example, as shown in Figures 9 and 10, when the first coil 220 has two refluxes, the heat exchange tube in the second heat exchange section (i.e., the outlet section of the first long U-shaped tube 201) and the heat exchange tube in the third heat exchange section (i.e., the inlet section of the second long U-shaped tube 202) can serve as the first heat exchange tube 221 and the second heat exchange tube 222. In other words, when the first heat exchange section and the second heat exchange section are long U-shaped tubes connected as one at the second ends, and the third heat exchange section and the fourth heat exchange section are U-shaped tubes connected as one at the second ends, the outlet of the upstream long U-shaped tube and the inlet of the downstream U-shaped tube are connected at the first end through the first water return structure 120. For another example, as shown in Figures 3 and 4, when the first coil 220 has three refluxes, the heat exchange tubes in the second heat exchange section (i.e., the outlet section of the first long U-shaped tube 201) and the heat exchange tubes in the third heat exchange section (i.e., the inlet section of the second long U-shaped tube 202) form the first heat exchange tube 221 and the second heat exchange tube 222, and the heat exchange tubes in the fourth heat exchange section (the outlet section of the second long U-shaped tube 202) and the heat exchange tubes in the fifth heat exchange section (the inlet section of the third long U-shaped tube 203) form the heat exchange tubes in the heat exchange section. The first heat exchange tube 221 and the second heat exchange tube 222, in other words, the first heat exchange section and the second heat exchange section are long U-shaped tubes connected as one at the second end, the third heat exchange section and the fourth heat exchange section are U-shaped tubes connected as one at the second end, and the fifth heat exchange section and the sixth heat exchange section are U-shaped tubes connected as one at the second end. Among the three long U-shaped tubes, the outlet of the upstream long U-shaped tube and the inlet of the downstream U-shaped tube are connected at the first end through the first return water structure 120.

[0094] In actual arrangement, all heat exchange tubes in the heat exchange assembly 200 that need to be interconnected at the first end can be connected through the same first water return structure 120. For example, in the case of multiple groups of first heat exchange tubes 221 and second heat exchange tubes 222, the first water return structure 120 can be provided with multiple spaced return channels 121 to connect the multiple groups of first heat exchange tubes 221 and second heat exchange tubes 222 respectively through different return channels 121. If two groups of the multiple groups of first heat exchange tubes 221 and second heat exchange tubes 222 have the same pressure difference or the pressure difference between the two groups is the same, a larger return channel 121 can also be provided on the first water return structure 120 to connect the multiple groups of first heat exchange tubes 221 and second heat exchange tubes 222 through the single return channel 121.

[0095] In some embodiments, the first water return structure 120 is provided with a reflux channel 121 , at least two of the multiple coils 210 are first coils 220 , and at least two first heat exchange tubes 221 are connected to corresponding second heat exchange tubes 222 through the same reflux channel 121 .

[0096] As shown in Figures 9 and 10 , multiple groups of first heat exchange tubes 221 and second heat exchange tubes 222 are connected through a first return channel 1211. Multiple first heat exchange tubes 221 are isobaric channels, and multiple second heat exchange tubes 222 are isobaric channels. The first heat exchange tubes 221 and second heat exchange tubes 222 in the same return flow in multiple first coils 220 can be connected through the same return channel 121. In this embodiment, the number of return channels 121 can be equal to the number of return flows in the first coil 220 minus one. For example, as shown in Figures 9 and 10 , when all first coils 220 have two return flows, the first water return structure 120 can be provided with a return channel 121. In all first coils 220, the heat exchange tubes in the second heat exchange section and the heat exchange tubes in the third heat exchange section are connected through this return channel 121. For another example, when all the first coils 220 are three-way reflux, the first water return structure 120 can be provided with two independent reflux channels 121. In all the first coils 220, the heat exchange tubes in the second heat exchange section are connected to the heat exchange tubes in the third heat exchange section through one of the reflux channels 121, and the heat exchange tubes in the fourth heat exchange section are connected to the heat exchange tubes in the fifth heat exchange section through the other reflux channel 121.

[0097] In other embodiments, as shown in Figures 3 and 4 in conjunction with Figures 5 and 6 , at least two of the multiple coils 210 are first coils 220, and the first water return structure 120 is provided with multiple reflux channels 121. A reflux channel 121 is provided between each of the multiple first heat exchange tubes 221 and the corresponding second heat exchange tubes 222. In other words, each group of first heat exchange tubes 221 and the second heat exchange tubes 222 communicating at the first end thereof has a corresponding reflux channel 121, and the reflux channel 121 is only connected to one group of first heat exchange tubes 221 and the second heat exchange tubes 222 communicating at the first end thereof.

[0098] In one specific embodiment, as shown in Figures 5 and 6 , the plurality of coils 210 are first coils 220 with two refluxes. Thus, each first coil 220 includes a set of first heat exchange tubes 221 and second heat exchange tubes 222, and the first water return structure 120 is provided with a reflux channel 121 corresponding to each first coil 220. Figures 5 and 6 not only include first coils with two refluxes, but also at least one coil 210 is a U-shaped tube, meaning that the coil 210 has only one reflux. The water flow within the coil 210 flows along paths B and D shown in Figure 5 . This process can also be understood with reference to the water flow path A3 in Figure 6 .

[0099] In another specific embodiment, as shown in Figures 3 and 4, the multiple coils 210 are first coils 220 with three refluxes. In this way, each first coil 220 includes two groups of first heat exchange tubes 221 and second heat exchange tubes 222, and the first return water structure 120 is respectively provided with two reflux channels 121 corresponding to each first coil 220.

[0100] In the solution with multiple reflux channels 121, as shown in Figures 3 and 5, the first water return structure 120 includes multiple protrusions 122 arranged at intervals, and adjacent protrusions 122 are connected by partitions 123. The protrusions 122 and partitions 123 are both connected to the inner wall surface of the housing 110. Each protrusion 122 is provided with a reflux channel 121. The protrusions 122 and the reflux channels 121 can be provided in a one-to-one correspondence, or multiple reflux channels 121 can be provided on one protrusion 122 as needed. When there are a large number of protrusions 122, to improve space utilization, some of the protrusions 122 can be tilted in their length relative to the top plate 1112 of the shell body 111 (a portion of the housing 110 of the water distribution and collection assembly 100). Furthermore, along the height direction of the shell body 111 (refer to the third direction Z), the tilt directions of two adjacent protrusions 122 can be opposite. This staggered arrangement of adjacent protrusions 122 allows multiple protrusions 122 to be arranged in a smaller space, thereby enabling the installation of a larger number of reflux channels 121. The partitions 123 are sealed against the protrusions 122. Specifically, the partitions 123 and protrusions 122 can be integrally formed, or the partitions 123, protrusions 122, and shell body 111 can also be integrally formed.

[0101] It should be noted that when a first coil 220 has three or more refluxes, a reflux channel 121 can be provided for both the first heat exchange tube 221 and the second heat exchange tube 222 at the first end of each reflux. Taking a first coil 220 with three refluxes as an example, the first water return structure 120 is provided with two reflux channels 121 corresponding to the first coil 220. The heat exchange tubes in the second heat exchange section are connected to the heat exchange tubes in the third heat exchange section through one of the reflux channels 121, and the heat exchange tubes in the fourth heat exchange section are connected to the heat exchange tubes in the fifth heat exchange section through the other reflux channel 121.

[0102] The first water return structure 120 of this embodiment may be an integrated structure. Specifically, the first water return structure 120 may be an integral structure formed by injection molding or a integral structure formed by welding.

[0103] In some embodiments, the water distribution assembly 100 includes a housing 110, within which is formed a receiving chamber 1117, which is divided into an inlet channel 101 and an outlet channel 102. As shown in Figures 7 and 8, in the absence of the first water return structure 120, an isolation plate 124 can be directly disposed within the receiving chamber 1117, thereby dividing the receiving chamber 1117 into the inlet channel 101 and the outlet channel 102. In the presence of the first water return structure 120, the first water return structure 120 can be connected to the inner wall surface of the housing 110, thereby dividing the receiving chamber 1117 into the inlet channel 101 and the outlet channel 102. The housing 110 is connected to one end of the heat exchange assembly 200, i.e., one end of the outer shell 230.

[0104] Optionally, a plurality of communication ports 118 are provided on the side wall of the shell 110 facing the outer shell 230 at positions corresponding to the water inlet channel 101 , and the communication ports 118 are connected to the accommodating cavity 1117 . The coil 210 is sealedly connected to the communication ports 118 and is connected to the accommodating cavity 1117 through the communication ports 118 .

[0105] Among them, a portion of the communication ports 118 can be provided corresponding to the water inlet channel 101. These communication ports 118 are defined as first communication ports 115. All first communication ports 115 are spaced apart. The water inlet ends 211 of all coils 210 can be sealed and connected to the first communication ports 115 and communicate with the water inlet channel 101 through the first communication ports 115. At least a portion of the remaining communication ports 118 can be provided corresponding to the water outlet channel 102. These communication ports 118 are defined as second communication ports 116. All second communication ports 116 are spaced apart. The water outlet ends 212 of all coils 210 can be sealed and connected to the second communication ports 116 and communicate with the water outlet channel 102 through the second communication ports 116.

[0106] Specifically, each first communication port 115 can be sealedly connected to the water inlet end 211 of a coil 210 and communicate with the water inlet channel 101. That is, the water inlet ends 211 of all coils 210 are connected to all first communication ports 115 in a one-to-one correspondence, and the circumferential sidewalls of the water inlet ends 211 are sealedly connected to the circumferential walls of the first communication ports 115 to prevent water leakage between the water inlet ends 211 and the first communication ports 115. At the same time, the water inlet ends 211 are communicated with the water inlet channel 101. A plurality of second communication ports 116 are provided on the sidewall of the housing 110 facing the outer shell 230 at positions corresponding to the water outlet channel 102. All second communication ports 116 are spaced apart, and each second communication port 116 is sealedly connected to the water outlet end 212 of a coil 210 and communicates with the water outlet channel 102. That is to say, the water outlet ends 212 in all the coils 210 are connected to all the second connecting ports 116 one by one, and the circumferential side walls of the water outlet ends 212 are sealedly connected to the circumferential walls of the second connecting ports 116 to prevent water from leaking between the water outlet ends 212 and the second connecting ports 116. At the same time, the water outlet ends 212 are connected to the water outlet channel 102.

[0107] The shell 110 of this embodiment may be substantially rectangular or elliptical, which matches the end of the heat exchange assembly 200 .

[0108] In some implementations, the sidewall of the housing 110 facing the heat exchange assembly 200 may be partially hollowed out to form a first communication port 115 and a second communication port 116. Optionally, the water inlet end 211 of the coil 210 may be inserted into the corresponding first communication port 115 and sealed with the circumferential inner wall of the first communication port 115. Optionally, the water outlet end 212 of the coil 210 may be inserted into the corresponding second communication port 116 and sealed with the circumferential inner wall of the second communication port 116.

[0109] The shell 110 can be an integrally formed structure, a structure connected as one body, or a detachable sealed connection structure. In some embodiments, the shell 110 includes a shell body 111 and a sealing plate 112. A first opening 1111 is provided on one side of the shell body 111. A first groove 113 and a second groove 114 are provided on the shell body 111, which are isolated from each other. The notches of the first groove 113 and the second groove 114 are both oriented in the same direction as the first opening 1111. The sealing plate 112 is sealed to the first opening 1111 and encloses the first groove 113 to form the water inlet channel 101, and the second groove 114 to form the water outlet channel 102. The sealing plate 112 is located on the side of the shell body 111 facing the heat exchange component 200, that is, the side facing the outer shell 230. In other words, the sealing plate 112 is the side wall of the shell 110 facing the heat exchange component 200.

[0110] The sealing plate 112 can be fixedly connected to the outer shell 230 of the heat exchange assembly 200. Specifically, in one embodiment, one end of the outer shell 230 can be an open structure, that is, one end of the outer shell 230 has a second opening. The sealing plate 112 covers the second opening of the outer shell 230 and is fixedly connected to the outer shell 230. In other words, the sealing plate 112 can serve as a side plate (i.e., an end plate) of the shell body 111. The sealing plate 112 can be understood as an end plate of the shell body 111. In another embodiment, the end surface of the shell 110 can be a solid structure, and the sealing plate 112 is connected to the end surface. The sealing plate 112 can be detachably connected to the outer shell 230 of the heat exchange assembly 200, for example, by screws, snap-fitting, etc., or it can be non-detachably connected. As shown in Figures 1, 2, and 3, the sealing plate 112 can optionally be provided with flanges 1121 on both sides along the width direction (which can be understood with reference to the second direction Y), and the outer shell 230 is positioned and mounted between the two flanges 1121. In addition to positioning the housing 230 , the flange 1121 can also be connected to other structures.

[0111] It should be noted that, as shown in Figure 27, the end of the housing 230 connected to the sealing plate 112 can also be equipped with an end plate 232. In other words, the end of the housing 230 connected to the sealing plate 112 is provided with an end plate 232, and the sealing plate 112 is fixedly connected to the end plate 232. Because the upper water distribution assembly 100 performs the important function of water flow distribution, its sealing and pressure resistance requirements are relatively high. The introduction of the additional end plate 232 component in the housing 230 allows the end plate 232 to bear the forces caused by shaking, falling, and impact during transportation, handling, and installation of the entire device, and prevents them from being transmitted to the water distribution assembly 100, thereby maintaining the sealing effect and pressure-bearing capacity of the water distribution assembly 100. It should be noted that the coil 210 passes through an additional end plate 232 provided with the housing 230. Specifically, this end plate 232 and the coil 210 may be connected by expansion joints. The coil 210 and the end plate 232 provided with the housing 110 are not sealed. The end plate 232 is connected to other structural components of the entire device to provide structural support. The end plate 232 provided with the housing 230 can be integral with the housing 230, or it can be assembled separately.

[0112] Among them, the sealing plate 112 can be an integrally formed plate structure, and the shell body 111 can also be an integrally formed structure. The shell body 111 and the sealing plate 112 can be connected as a whole by welding or the like, or can be fixedly connected by screws or the like. It should be noted that no matter which connection method is used, a seal should be formed between the sealing plate 112 and the shell body 111 so that the water inlet channel 101 and the water outlet channel 102 can be independent of each other and will not leak. Specifically, this can be achieved by welding sealing, expansion sealing, glue sealing, rubber gasket (sealing ring) sealing, etc. The first connecting port 115 on the sealing plate 112 and the water inlet end 211 of the coil 210 can be connected by welding, sealing ring sealing, glue sealing, expansion sealing, etc. The second connecting port 116 on the sealing plate 112 and the water outlet end 212 of the coil 210 can also be connected by welding, sealing ring sealing, glue sealing, expansion sealing, etc.

[0113] In some embodiments, the water distribution assembly 100 further includes a sealing gasket 130 , which is sealingly disposed between the sealing plate 112 and the shell body 111 .

[0114] In some embodiments, the first water return structure 120 is connected to the inner wall surface of the shell body 111, and the two are an integral structure. Specifically, the first water return structure 120 and the shell body 111 can be injection molded into an integral structure. The first water return structure 120 and the shell body 111 can be made of the same material. For example, the first water return structure 120 and the shell body 111 can be made of metal. In this case, the first water return structure 120 and the shell body 111 can be welded or sintered by powder alloy or sand cast or forged or machined to form an integral structure. The first water return structure 120 and the shell body 111 can also be made of ceramic or glass. In this case, the first water return structure 120 and the shell body 111 can be formed into an integral structure by sintering or the like. The first water return structure 120 and the shell body 111 can also be made of plastic. In this case, the first water return structure 120 and the shell body 111 can be formed into an integral structure by injection molding, sintering, molding or the like.

[0115] In some other embodiments, as shown in Figures 23 and 24, the shell body 111 may include a circumferential frame 1113 and a top plate 1112, the top plate 1112 is connected to the end of the circumferential frame 1113 facing away from the sealing plate 112, the circumferential frame 1113 and the top plate 1112 are sealed and connected, and the two can be split assembly structures, and the first return water structure 120 can be assembled separately or integrally formed on the inner wall surface of the top plate 1112. It is understandable that the structure of the heat exchange component 200 of the coil heat exchanger 10 is different depending on the usage environment and requirements. For example, it can be a sub-collection component 100 without the first return water structure 120, or it can be a sub-collection component 100 with the first return water structure 120. In the sub-collection component 100 with the first return water structure 120, the first return water structure 120 can also be different. By setting the shell body 111 as a structure in which the circumferential frame 1113 and the top plate 1112 are separately assembled, the circumferential frame 1113 can be used as a standard part and can be used in different first return water structures 120, so that the circumferential frame 1113 can be mass-produced automatically with high production efficiency and low cost.

[0116] In other embodiments, as shown in Figures 25 and 26, the circumferential frame 1113 and the top plate 1112 of the shell body 111 are an integral structure, and the first water return structure 120 is separately assembled onto the top plate 1112. In this way, the shell body 111 as a whole can be used as a universal standard component. For different coil heat exchangers 10, only different first water return structures 120 need to be assembled into the shell body 111. This allows the shell body 111 to be used as a standard component, allowing the shell body 111 to be mass-produced in batches and automatically, with high production efficiency and low cost.

[0117] In this embodiment, the sealed connection between the coil 210 and the sealing plate 112 can be in various forms. Several sealing solutions are specifically introduced below.

[0118] In some implementations, as shown in Figures 13 and 14, the sealing plate 112 can be made of metal, and the heat exchange tube is also made of metal. The water inlet end 211 of the coil 210 can be welded to the first connecting port 115 of the sealing plate 112, and the water outlet end 212 of the coil 210 can be welded and sealed to the second connecting port 116 of the sealing plate 112. Specifically, the sealing plate 112 forms a raised ring at the position corresponding to the first connecting port 115 and the second connecting port 116, and the inner wall surface of the raised ring is the sealing connection surface 1122. The sealing connection surface 1122 is sealed to the coil 210 by solder 1123. The specific welding method can be flame welding, furnace welding or high-frequency welding, etc.

[0119] In some implementations, as shown in FIG15 , the sealing plate 112 forms an interference fit with both the inlet and outlet ends of the coil 210. Furthermore, the inner diameter of the first communication port 115 of the sealing plate 112 (i.e., the diameter of the contact surface between the first communication port 115 and the heat exchange tube) is smaller than or equal to the inlet end of the expanded coil 210, and the inner diameter of the second communication port 116 of the sealing plate 112 (i.e., the diameter of the contact surface between the second communication port 116 and the heat exchange tube) is smaller than or equal to the outer diameter of the outlet end of the expanded coil 210, forming an interference fit and providing a seal. In this expansion connection scheme, the thickness of the sealing plate 112 can be greater than or equal to 5 mm, and the inner walls of the first and second communication ports can be provided with sealing grooves. The sealing plate 112 can be made of metal, ceramic, glass, plastic, rubber, silicone, or a composite of these materials. The coil 210 is generally made of metal to improve heat exchange efficiency. Specifically, a raised ring is formed on the sealing plate 112 at positions corresponding to the first communication port 115 and the second communication port 116 . The inner wall surface of the raised ring is a sealing connection surface 1122 , and the sealing connection surface 1122 is interference fit with the coil 210 .

[0120] In some implementations, as shown in FIG13 , glue may be applied between the inner side of the first communication port 115 of the sealing plate 112 and the outer peripheral wall of the water inlet end 211 of the coil 210, and glue may be applied between the inner side of the second communication port 116 and the outer peripheral wall of the water outlet end 212 of the coil 210. The coil 210 may be connected to the sealing plate 112 by welding or expansion joint, and the glue may be attached between the outer wall of the coil 210 and the inner side of the communication port of the sealing plate 112 to perform a sealing function.

[0121] In some implementations, as shown in FIG16 , a sealing ring 1124, such as an O-ring, is placed between the inner side of the first communication opening 115 of the sealing plate 112 and the outer circumferential wall of the water inlet end 211 of the coil 210, and between the inner side of the second communication opening 116 and the outer circumferential wall of the water outlet end 212 of the coil 210. In other words, the sealing ring 1124 is placed inside the contact surface between the sealing plate 112 and the outer wall of the coil 210. After the coil 210 is expanded, the sealing ring 1124 is squeezed between the outer wall of the coil 210 and the inner wall of the communication opening of the sealing plate 112, thereby providing a seal. The sealing ring 1124 may be made of rubber or silicone.

[0122] In some implementations, as shown in Figures 17, 18 and 19, the water distribution assembly 100 also includes a sealing gasket 130, which is sealed between the sealing plate 112 and the shell body 111. The sealing gasket 130 covers the first opening 1111. The sealing gasket 130 is provided with a plurality of through-holes 134, which correspond one-to-one to the connecting port 118 and are coaxially arranged. The coil 210 passes through the connecting port 118 and is sealed and connected to the through-hole 134.

[0123] The through-holes 134 include at least a plurality of first through-holes 131 and a plurality of second through-holes 132. Specifically, the sealing gasket 130 is provided with a plurality of first through-holes 131 corresponding to the positions of the water inlet channel 101, and the sealing gasket 130 is provided with a plurality of second through-holes 132 corresponding to the positions of the water outlet channel 102. The plurality of first through-holes 131 correspond one-to-one with the plurality of first communication ports 115 and are coaxially arranged. The water inlet ends 211 of the plurality of coils 210 pass through the first communication ports 115 in a one-to-one correspondence and are sealedly connected to the first through-holes 131. The plurality of second through-holes 132 correspond one-to-one with the plurality of second communication ports 116 and are coaxially arranged. The water outlet ends 212 of the plurality of coils 210 pass through the second communication ports 116 in a one-to-one correspondence and are sealedly connected to the second communication ports 116.

[0124] The sealing gasket 130 is made of rubber, silicone or other materials. When assembled, there is a certain gap between the contact surface between the first communication port 115 of the sealing plate 112 and the water inlet end 211 of the coil 210, and between the contact surface between the second communication port 116 of the sealing plate 112 and the water outlet end 212 of the coil 210. The sealing gasket 130 is sleeved on the water inlet end 211 and the water outlet end 212 of the coil 210. When the shell body 111 and the sealing plate 112 are assembled, the shell body 111 and the sealing plate 112 are not in contact with each other. The tightening force between the two squeezes the sealing gasket 130 between them, causing part of the sealing gasket 130 material to be squeezed into the gap between the outer wall of the coil 210 and the first and second communication ports 115, 116 of the sealing plate 112, thereby providing a seal. Simultaneously, the inlet end of the coil 210 and the first through-hole 131 of the sealing gasket 130 can form an interference fit to provide a seal, and the outlet end of the coil 210 and the second through-hole 132 of the sealing gasket 130 can form an interference fit to provide a seal. In this embodiment, the use of a single sealing gasket 130 allows for the sealing arrangement of the inlet and outlet ends of multiple coils 210, which is convenient to operate and assemble, and has good sealing performance.

[0125] It should be noted that the circumferential edge of the sealing gasket 130 can also seal the air passage connecting the shell body 111 and the sealing plate 112. Specifically, the end surface of the circumferential edge of the sealing gasket 130 can be provided with one or more sealing grooves along the circumference. When there are multiple sealing grooves, each circle of the sealing grooves encircles the circumferential edge of the sealing gasket 130. The multiple circles of sealing grooves are spaced apart along the thickness direction of the sealing gasket 130. The multiple circles of sealing grooves can provide multiple circles and multiple layers of sealing. In the solution using the sealing gasket 130, the coil 210 can also be connected to the sealing gasket 130 and the sealing plate 112 by expansion joint.

[0126] Optionally, in the scheme of the sealing gasket 130, the inner walls of the first through-hole 131 and the second through-hole 132 of the sealing gasket 130 can be provided with a circumferential sealing groove, and / or, the inner walls of the first connecting port 115 and the second connecting port 116 can also be provided with a circumferential sealing groove, and the outer peripheral wall of the coil 210 can be provided with a sealing ring, and the sealing ring can be correspondingly arranged in the circumferential sealing groove to further improve the sealing effect.

[0127] The term "expansion connection" refers to the process by which the coil 210 is connected to the sealing plate 112 after expanding outward under the pressure of internal gas or liquid. One method for implementing the expansion connection of the coil 210 is to first assemble the coil 210 in a flat tube state to the first and second connecting ports 115, 116 (and / or the first and second through ports 131, 132, etc.), then temporarily seal the outlet of the coil 210, and inject gas through the inlet of the coil 210 to increase the pressure within the coil 210. The coil 210 is typically a metal tube. Under the pressure, the coil 210 expands outward and abuts against the sealing plate (and / or the sealing gasket 130) to achieve connection.

[0128] It should be noted that the above-mentioned multiple sealing solutions can also be used in combination to form a better seal between the coil 210 and the sealing plate 112. It should also be noted that when the first water return structure 120 is provided, the sealing plate 112 is also provided with a third connecting port 117 connected to the return channel 121. The third connecting port 117 is sealedly connected to the corresponding heat exchange tube (i.e., the long U-shaped tube). In the solution of the sealing gasket 130, the sealing gasket 130 also has a third through-hole 133 corresponding to the third connecting port 117. The specific sealing method can refer to the sealing connection method between the water inlet end 211 or the water outlet end 212 of the coil 210 and the sealing plate 112, which will not be repeated here. The first communication port 115 and the second communication port 116 can have the same structure. In the case of the first through-port 131, the first communication port 115, the second communication port 116 and the first through-port 131 can all have the same structure, for example, they can all be circular holes of equal diameter. In this way, when processing and preparing the water distribution and collection component 100, there is no need to distinguish between the first communication port 115, the second communication port 116 and the first through-port 131, which makes processing more convenient and efficient.

[0129] In some embodiments, the water inlet connector 140 is connected to the side wall of the housing 110 away from the heat exchange assembly 200. Specifically, a water inlet through-hole 1114 may be provided on the side wall of the housing body 111 opposite the sealing plate 112, corresponding to the water inlet channel 101. The water inlet connector 140 is coaxially arranged and communicates with the water inlet through-hole 1114. The water inlet connector 140 may be a tubular member, and its inner or outer wall may be provided with threads, so that the water inlet connector 140 can be threadedly connected to the outlet pipe of the heat exchange water supply system. The water inlet connector 140 may be at least partially located on the outside of the housing body 111 and extend toward the side of the housing body 111 away from the sealing plate 112, so as to facilitate the connection of the water inlet connector 140 to the outlet pipe of the heat exchange water supply system.

[0130] Optionally, the water outlet connector 150 and the water inlet connector 140 may be disposed on the same sidewall of the housing 110. For example, the water outlet connector 150 may be connected to the sidewall of the housing 110 away from the heat exchange assembly 200. Specifically, a water outlet through-hole 1115 may be provided on the sidewall of the housing body 111 opposite the sealing plate 112, corresponding to the water inlet channel 101, and the water outlet connector 150 may be coaxially disposed and communicate with the water outlet through-hole 1115. The water outlet connector 150 may be at least partially located outside the housing body 111 and extend toward the side of the housing body 111 facing away from the sealing plate 112. Among them, the water outlet joint 150 can be a tubular part, and its inner wall or outer wall can be provided with a thread, so that the water outlet joint 150 can be threadedly connected to the water inlet pipe of the heat exchange water supply system. The water outlet joint 150 can be at least partially located on the outside of the shell body 111 and extend toward the side of the shell body 111 away from the sealing plate 112, so as to facilitate the connection of the water inlet joint 140 with the water inlet pipe of the heat exchange water supply system.

[0131] In this embodiment, as shown in FIG. 1 and FIG. 2 , the water inlet joint 140 may be disposed below the water outlet joint 150 . Arrow A in the figure indicates the flow direction of water in the water distribution and collection assembly 100 .

[0132] It can be understood that the water inlet joint 140 and the water outlet joint 150 are arranged on the shell body 111, which is convenient for connection and assembly; the water inlet joint 140 and the water outlet joint 150 are arranged on the same side wall, which is beneficial to improving the rationality of the component layout of the coil heat exchanger 10, reducing the space occupied by the water inlet joint 140 and the water outlet joint 150 in different directions, and is also beneficial to the heat exchange and water supply system being connected to the distribution and collection assembly 100 from one direction.

[0133] It should be noted that the water inlet connector 140 and the water outlet connector 150 may also be provided on different side walls of the shell body 111 .

[0134] In some embodiments, optionally, as shown in FIG1 and FIG2 , the water inlet connector 140 and the water outlet connector 150 can be an integral structure with the shell body 111, can be an integral structure formed by integral processing, or can be an integral structure formed by separate assembly. In some embodiments, the water inlet connector 140 and the water outlet connector 150 and the shell body 111 are made of the same material. For example, the water inlet connector 140 and the water outlet connector 150 and the shell body 111 are all made of metal materials, and the water inlet connector 140 and the water outlet connector 150 and the shell body 111 are integrally formed using metal materials through powder alloy sintering, sand casting, forging, or machining; for another example, the water inlet connector 140 and the water outlet connector 150 and the shell body 111 are made of ceramic, glass, or other materials, and the water inlet connector 140 and the water outlet connector 150 are integrally formed using metal materials through powder alloy sintering, sand casting, forging, or machining. 150 and the shell body 111 are integrally formed by sintering or other methods; for another example, the water inlet connector 140, the water outlet connector 150 and the shell body 111 are made of plastic or other materials, and the water inlet connector 140, the water outlet connector 150 and the shell body 111 plastic are integrally formed by injection molding, molding, or 3D printing (3D printing is a type of rapid prototyping technology, also known as additive manufacturing. It is a technology that uses a digital model file as a basis and uses powdered metal or plastic and other adhesive materials to construct objects by printing layer by layer). In other implementations, the water inlet connector 140, the water outlet connector 150 and the shell body 111 are made of different materials. For example, the water inlet connector 140 and the water outlet connector 150 are made of metal material, and the shell body 111 is made of non-metallic material. The water inlet connector 140 and the water outlet connector 150 are both embedded in the through hole of the shell body 111 and integrally formed by injection molding, sintering, molding, etc.

[0135] It should be noted that the metal material can be stainless steel, copper, etc. The water inlet connector 140 and the water outlet connector 150 can be made of the same material or different materials, and the water inlet connector 140 and the shell body 111, as well as the water outlet connector 150 and the shell body 111, can be connected in the same manner or in different manners. Optionally, in order to improve the versatility of the water inlet connector 140 and the water outlet connector 150, in some embodiments, the water inlet connector 140 and the water outlet connector 150 are set to be made of the same material and have the same structure, and the water inlet connector 140 and the shell body 111, as well as the water outlet connector 150 and the shell body 111, use the same connection method.

[0136] It can be understood that the shell body 111, the water inlet joint 140, the water outlet joint 150 and the shell body 111 are an integrated structure, which can have a simple structure, high assembly efficiency, fewer sealing connection surfaces 1122, and higher reliability of the water distribution assembly 100.

[0137] In other embodiments, as shown in Figures 20 to 22, the water inlet connector 140 and the water outlet connector 150 can be separately provided and then assembled and connected to the shell body 111. Specifically, the shell body 111 is provided with a water inlet through-hole 1114, a water inlet channel 101, a return channel 121, a water outlet channel 102, and a water outlet through-hole 1115. The water outlet through-hole 1115 is provided at a position corresponding to the water inlet channel 101 and is in communication with the water inlet channel 101. The water outlet through-hole 1115 is provided at a position corresponding to the water outlet channel 102 and is in communication with the water outlet channel 102. The water inlet connector 140 is sealedly connected to the water inlet through-hole 1114, forming a sealed connection 1116. The water outlet connector 150 is sealedly connected to the water outlet through-hole 1115. Among them, the water inlet joint 140 can be welded, riveted, crimped or embedded into the water inlet through-hole 1114 to be sealed and connected with the shell body 111, or it can be sealed and connected with the shell body 111 using rubber rings, rubber gaskets, etc.; similarly, the water outlet joint 150 can be welded, riveted, crimped or embedded into the water outlet through-hole 1115 to be sealed and connected with the shell body 111, or it can be sealed and connected with the shell body 111 using rubber rings, rubber gaskets, etc.

[0138] The coil heat exchanger 10 has different structures for the heat exchange assembly 200 depending on the usage environment and requirements. For example, the heat exchange assembly 200 may be a water distribution assembly 100 without or with the first water return structure 120. In the water distribution assembly 100 with the first water return structure 120, the first water return structure 120 may also be different. The water inlet connector 140 and the water outlet connector 150 are configured to be assembled separately from the housing 110, making them universal and standard components suitable for use with different types of housings 111. This allows for large-scale automated mass production of the water inlet connector 140 and the water outlet connector 150, resulting in high efficiency and low cost.

[0139] In some embodiments, a vent assembly 160 is provided on the water distribution assembly 100 to release gas from the water flow path. Vent assembly 160 can communicate with the water outlet channel 102. Specifically, as shown in FIG12 , vent assembly 160 can be provided on the water outlet connector 150. As shown in FIG11 , vent assembly 160 can also be provided on the housing 111 , specifically on the top plate 1112 , corresponding to the water outlet channel 102. Vent assembly 160 can be an exhaust valve that can be opened to release gas from the water flow path or closed to seal vent assembly 160 and prevent water leakage.

[0140] In some embodiments, a drain assembly 170 is provided on the water distribution and collection assembly 100, and the vent assembly 160 is used to release water from the water flow path. Drain assembly 170 can be connected to the water inlet channel 101. Specifically, as shown in Figure 12, drain assembly 170 can be installed on the water outlet connector 150. As shown in Figure 11, drain assembly 170 can also be installed on the shell body 111, specifically on the top plate 1112, and correspond to the water inlet channel 101. Drain assembly 170 can be a drain valve. Drain assembly 170 can be opened to release air from the water flow path, or closed to seal the drain assembly 170 and prevent water leakage.

[0141] It should be noted that the positions of the exhaust assembly 160 and the drain assembly 170 can also be interchanged. In this embodiment, the exhaust assembly 160 can be arranged above the drain assembly 170. In this embodiment, by connecting the exhaust assembly 160 with the water outlet channel 102, the exhaust effect is better compared to the form in which the exhaust assembly 160 is connected to the water inlet channel 101. This allows more gas in the heat exchange assembly 200 to be discharged, thereby improving the heat exchange efficiency. In this embodiment, by connecting the drain assembly 170 with the water inlet channel 101, it is beneficial to drain all the water in the heat exchange assembly 200 when the heat exchange assembly 200 is not in use.

[0142] As shown in Figure 28, an embodiment of the present application also provides a HVAC equipment, including a fan 20 and a coil heat exchanger 10 proposed in this application or any embodiment of the present application, and the fan 20 is arranged on one side of the coil heat exchanger 10.

[0143] Specifically, the fan 20 can be arranged on one side of the heat exchange component 200 along the second direction Y, and the flow direction E of the airflow formed by the fan 20 is substantially parallel to the second direction Y.

[0144] The HVAC equipment may also include other components, such as a heat exchange water supply system. The connection between the heat exchange water supply system and the coil heat exchanger 10 can be referred to above and will not be repeated here.

[0145] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A coil heat exchanger, wherein: include: A water collection component, wherein the water collection component has a water inlet channel and a water outlet channel that are isolated from each other; The heat exchange assembly includes multiple coils and fins, each coil having a water inlet end and a water outlet end, the water inlet ends of the multiple coils are respectively connected to the water distribution assembly and respectively communicated with the water inlet channel, the water outlet ends of the multiple coils are respectively connected to the water distribution assembly and respectively communicated with the water outlet channel, and the fins are connected to the coils.

2. The coil heat exchanger according to claim 1, wherein: The water distribution and collection assembly includes a shell having an accommodating cavity therein, the water inlet channel and the water outlet channel being formed in the accommodating cavity, the shell being arranged at one end of the heat exchange assembly, and a plurality of communication ports being arranged at intervals on the side wall of the shell facing the heat exchange assembly, the coil being sealed and connected to the communication ports and communicating with the accommodating cavity through the communication ports.

3. The coil heat exchanger according to claim 2, wherein: The multiple connecting ports include a plurality of first connecting ports arranged at intervals and a plurality of second connecting ports arranged at intervals, all of the first connecting ports correspond to the positions of the water inlet channel and are connected to the water inlet channel, the water inlet end of the coil is sealed and connected to the first connecting port, all of the second connecting ports correspond to the positions of the water outlet channel and are connected to the water outlet channel, and the water outlet end of the coil is sealed and connected to the second connecting port.

4. The coil heat exchanger according to claim 2, wherein: A first water return structure is also provided in the shell. At least one of the multiple coils is a first coil. The first coil includes a first heat exchange tube and a second heat exchange tube. The outlet of the first heat exchange tube and the inlet of the second heat exchange tube are both arranged toward the water distribution assembly. In the same first coil, the outlet of the first heat exchange tube and the inlet of the second heat exchange tube are connected through the first water return structure, so that the first heat exchange tube and the second heat exchange tube are connected in series.

5. The coil heat exchanger according to claim 4, wherein: The water inlet channel and the water outlet channel are respectively arranged on both sides of the first water return structure.

6. The coil heat exchanger according to claim 5, wherein: The first water return structure is connected to the inner wall surface of the shell and divides the accommodating cavity into the water outlet channel and the water inlet channel.

7. The coil heat exchanger according to any one of claims 4 to 6, wherein: The first water return structure is provided with a reflux channel, at least two of the plurality of coils are first coils, and at least two of the first heat exchange tubes are connected to the corresponding second heat exchange tubes through the same reflux channel.

8. The coil heat exchanger according to any one of claims 4 to 7, wherein: There are at least two first coils among the plurality of coils, the first water return structure is provided with a plurality of reflux channels, and the reflux channels are provided one-to-one between all the first heat exchange tubes and the corresponding second heat exchange tubes.

9. The coil heat exchanger according to claim 8, wherein: The first water return structure includes a plurality of protrusions arranged at intervals, adjacent protrusions are connected by partitions, the protrusions and the partitions are both connected to the inner wall surface of the shell, and the return channel is provided on each protrusion.

10. The coil heat exchanger according to claim 8 or 9, wherein: The first water return structure is an integrated structure; And / or, the first water return structure and the shell are an integrally formed structure or a split assembly structure.

11. The coil heat exchanger according to any one of claims 2 to 10, wherein: The shell includes a shell body and a sealing plate. The shell body is provided with a first opening on a side facing the heat exchange component. The shell body is provided with a first groove and a second groove isolated from each other. The orientation of the notch of the first groove and the orientation of the notch of the second groove are consistent with the orientation of the first opening. The sealing plate is sealed at the first opening and encloses the first groove to form the water inlet channel and the second groove to form the water outlet channel. All the connecting ports are provided on the sealing plate.

12. The coil heat exchanger according to claim 11, wherein: The heat exchange assembly further includes a shell, and the sealing plate is connected to the end surface of the shell.

13. The coil heat exchanger according to claim 12, wherein: An end plate is provided at one end of the shell, and the sealing plate is connected to the end surface of the shell through the end plate.

14. The coil heat exchanger according to any one of claims 11 to 13, wherein: The shell body is an integrated structure; And / or, the sealing plate is an integral structure.

15. The coil heat exchanger according to any one of claims 11 to 14, wherein: The water distribution assembly further includes a sealing gasket, which is sealingly disposed between the sealing plate and the shell body.

16. The coil heat exchanger according to claim 15, wherein: The sealing gasket covers the first opening and is provided with a plurality of through-holes. The through-holes correspond to the communication openings one by one and are coaxially arranged. The coil passes through the communication openings and is sealed and connected to the through-holes.

17. The coil heat exchanger according to claim 16, wherein: The plurality of coils are connected to the sealing pad and the sealing plate by expansion joint.

18. The coil heat exchanger according to any one of claims 11 to 17, wherein: The sub-collection assembly further includes a water inlet joint and a water outlet joint, both of which are connected to the shell body, the water inlet joint is communicated with the water inlet channel, and the water outlet joint is communicated with the water outlet channel.

19. The coil heat exchanger according to claim 18, wherein The water inlet joint and the shell body are an integrated structure; And / or, the water outlet joint and the shell body are an integral structure.

20. The coil heat exchanger according to claim 18 or 19, wherein: The water distribution assembly further includes an exhaust assembly, which is in communication with the water outlet channel, and the water outlet connector and / or the housing are connected to the exhaust assembly; And / or, the water distribution and collection assembly further includes a drainage assembly, the drainage assembly is communicated with the water inlet channel, and the drainage assembly is connected to the water inlet joint and / or the shell.

21. A heating and ventilation equipment, wherein: It comprises a fan and the coil heat exchanger according to any one of claims 1 to 20, wherein the fan is arranged on one side of the coil heat exchanger.

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