Heat exchange fin, heat exchanger, water tank assembly and gas water heater

Abstract

The application discloses a heat exchange fin, a heat exchanger, a water tank assembly and a gas water heater. The heat exchange fin comprises a fin body and an enclosing part. The fin body has a thickness direction. The enclosing part is connected to one side surface of the fin body in the thickness direction and cooperates with the fin body to form a pipe passing opening. The pipe passing opening is used for penetrating a heat exchange pipe. The enclosing part has a material passing opening which is communicated with the pipe passing opening and is used for flowing a solder to a gap between the pipe passing opening and the heat exchange pipe. The technical scheme can improve the heat exchange efficiency between the heat exchange fin and the heat exchange pipe.

Description

Technical Field

[0001] This application relates to the field of gas water heater technology, and in particular to a heat exchange fin, a heat exchanger, a water tank assembly, and a gas water heater. Background Technology

[0002] The high-temperature flue gas produced by the burner of the gas water heater exchanges heat with the heat exchange liquid in the heat exchange tube to heat the heat exchange liquid.

[0003] Heat exchangers typically have heat exchange fins to improve the heat exchange efficiency between the heat exchange tubes and the flue gas. Specifically, the heat exchange tubes are inserted through the heat exchange fins to increase the contact area with the flue gas, thereby improving the heat exchange efficiency.

[0004] However, in related technologies, the connection area between the heat exchange tube and the heat exchange fin is small, resulting in low heat exchange efficiency between the heat exchange tube and the heat exchange fin, which in turn affects the heat exchange efficiency between the two. Utility Model Content

[0005] This application provides a heat exchange fin, a heat exchanger, a water tank assembly, and a gas water heater, which can improve the heat exchange efficiency between the heat exchange fin and the heat exchange tube.

[0006] In a first aspect, embodiments of this application provide a heat exchange fin, which includes a fin body and a surrounding component;

[0007] The fin body has a thickness direction, and the enclosure is connected to one side surface of the fin body in the thickness direction, and cooperates with the fin body to form a through-hole, which is used for the heat exchange tube to pass through.

[0008] The enclosure has a material inlet communicating with the through-pipe, and the material inlet is used to allow solder to flow into the gap between the through-pipe and the heat exchange tube.

[0009] In some embodiments, the feed ports include a plurality of ports, and the plurality of feed ports are arranged at intervals along the circumference of the enclosure.

[0010] In some embodiments, the feed inlets include two, and the two feed inlets are axially symmetrically distributed.

[0011] In some embodiments, the feed port is located on the edge of the enclosure on the side away from the fin body, along the thickness direction.

[0012] In some embodiments, in the thickness direction, the feed port does not extend to the intersection line of the enclosure and the fin body; and / or,

[0013] The feed port is an arc-shaped opening formed by a recess in the thickness direction toward the fin body.

[0014] In some embodiments, the heat exchange fins include a plurality of fins, which are arranged at intervals along the thickness direction. Each of the plurality of heat exchange fins has a discharge port, which is connected to the feed port.

[0015] The discharge ports of the multiple heat exchange fins are aligned along the thickness direction for placing the solder.

[0016] In some embodiments, for the same heat exchange fin, the discharge port and the feed port are located on the same radial direction as the feed port.

[0017] In some embodiments, the fin body further has a width direction and a length direction; the enclosure includes a plurality of enclosures arranged in at most two rows, the at most two rows of enclosures being spaced apart along the width direction, and each row including a plurality of enclosures spaced apart along the length direction;

[0018] The material discharge port includes multiple ports, and each material discharge port is correspondingly provided with one enclosure component.

[0019] In some embodiments, the heat exchange fins include a plurality of fins, which are arranged at intervals along the thickness direction, and the enclosure of the plurality of heat exchange fins is provided with a limiting portion.

[0020] In this configuration, along the arrangement direction of the plurality of heat exchange fins, the limiting portion of any one of the heat exchange fins is used to limit and block the heat exchange fins adjacent to it.

[0021] In some embodiments, the limiting portion is a limiting flange, which is formed on the edge of the enclosure member away from the fin body along the thickness direction;

[0022] The limiting flange is set at an angle to the enclosure, and in the radial direction of the pipe opening, the limiting flange extends away from the pipe opening.

[0023] In some embodiments, a plurality of the limiting portions are provided on the same enclosure member in a spaced-apart arrangement.

[0024] Secondly, embodiments of this application provide a heat exchanger, which includes heat exchange fins and heat exchange tubes as described above, with the heat exchange tubes passing through the through-hole.

[0025] Thirdly, embodiments of this application provide a water tank assembly, which includes a tank body and a heat exchanger as described above, wherein the tank body has a flue gas chamber and the heat exchanger is disposed within the flue gas chamber.

[0026] In some embodiments, the housing further has a flue gas inlet communicating with the flue gas chamber; the heat exchange tubes include a plurality of tubes, and the plurality of heat exchange tubes include a first main heat exchange tube group and a condenser heat exchange tube group;

[0027] The condenser heat exchanger tube group is located on the side of the first main heat exchanger tube group facing away from the flue gas inlet.

[0028] In some embodiments, the housing includes a first side panel and a second side panel, the first side panel having a plurality of first main hot water exchange boxes and the second side panel having a plurality of second main hot water exchange boxes;

[0029] The first main heat exchange tube group includes multiple first main heat exchange tubes, and each first main heat exchange tube is connected to a first main heat exchange water box and a second main heat exchange water box, so that the multiple first main heat exchange tubes are connected in series to form a series water circuit.

[0030] In some embodiments, a plurality of the first main heat exchange tubes are arranged in at least two rows, and each row includes a plurality of first main heat exchange tubes arranged at intervals.

[0031] In this arrangement, along the direction of the arrangement of the multiple first main heat exchange tubes in each row, the multiple first main heat exchange tubes in adjacent rows are arranged alternately.

[0032] In some embodiments, the first side plate also has a plurality of first condensing water exchange boxes, and the second side plate also has a plurality of second condensing water exchange boxes;

[0033] The condenser heat exchanger tube assembly includes multiple condenser heat exchanger tubes, and at least two of the condenser heat exchanger tubes are connected to a first condenser heat exchanger box and a second condenser heat exchanger box.

[0034] In some embodiments, the second side panel also has a third main hot water exchange box, and the first side panel has at least two fourth main hot water exchange boxes;

[0035] The plurality of heat exchange tubes further includes a second main heat exchange tube group, which is located on the side of the first main heat exchange tube group facing the flue gas inlet and includes a plurality of second main heat exchange tubes, with at least two second main heat exchange tubes forming a parallel heat exchange tube group.

[0036] The parallel heat exchange tube assembly includes two sets, one set having its two ends connected to the third main heat exchanger box and one of the fourth main heat exchanger boxes respectively, and the other set having its two ends connected to the third main heat exchanger box and another fourth main heat exchanger box respectively; wherein, the two sets of parallel heat exchange tube assemblies are spaced apart in the direction from the first side plate to the second side plate, and are respectively arranged adjacent to the first side plate and the second side plate.

[0037] Fourthly, embodiments of this application provide a gas water heater, which includes a housing, a water tank assembly as described above, and a burner;

[0038] The water tank assembly is located inside the housing, and the burner is located inside the housing and can generate heat exchange flue gas flowing to the flue gas chamber.

[0039] Based on the heat exchange fins, heat exchanger, water tank assembly, and gas water heater of this application embodiment, by utilizing the cooperation between the fin body and the enclosure to construct the pipe outlet, and the enclosure having a material outlet, the heat exchange fins of this embodiment at least have the following technical effects:

[0040] First, based on the fin body, a connecting member is provided to connect with the fin body, and the connecting member and the fin body cooperate to form a pipe opening, which increases the depth of the pipe opening and thus increases the connection area between the pipe opening wall and the outer wall of the heat exchange tube. This can improve the heat transfer efficiency of the heat exchange tube and the heat exchange fin, and also help improve the stability of the connection between the heat exchange tube and the heat exchange fin.

[0041] Secondly, by providing a feed port on the enclosure, the solder can flow through the feed port to the gap between the feed port and the heat exchange tube. This allows the solder to fill the gap between the feed port and the heat exchange tube as much as possible, reducing the probability of unfilled areas in the gap. This increases the connection area between the feed port wall and the outer wall of the heat exchange tube, thereby improving the heat transfer efficiency of the heat exchange tube and the heat exchange fins, and also helps to improve the stability of the connection between the heat exchange tube and the heat exchange fins. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of a water tank assembly according to an embodiment of this application;

[0044] Figure 2 for Figure 1 A partial structural diagram of the intermediate heat exchanger;

[0045] Figure 3 for Figure 2 Schematic diagram of the structure of the heat exchange fins;

[0046] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0047] Figure 5 for Figure 1 A partial structural diagram of the intermediate heat exchanger;

[0048] Figure 6 for Figure 5 A schematic diagram showing the connection of multiple heat exchange fins;

[0049] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0050] Figure 8 This is a schematic diagram of the structure of a water tank assembly according to an embodiment of this application;

[0051] Figure 9 for Figure 8 Another structural schematic diagram of the intermediate water tank assembly;

[0052] Figure 10 For along Figure 8 Cross-sectional view of the CC section in the middle;

[0053] Figure 11 for Figure 8 A schematic diagram of the exploded structure from a perspective of the first side panel in the middle;

[0054] Figure 12 for Figure 11 A exploded structural diagram of the first side panel from another perspective.

[0055] Explanation of icon numbers:

[0056] 1. Water tank assembly; 10. Housing; 10A. Flue gas chamber; 10B. Flue gas inlet; 10C. Flue gas outlet; 10D. Water inlet; 10E. Water outlet; 10F. Water box; 11. First side panel; 11A. First main heat exchanger box; 11B. First condensate heat exchanger box; 11C. Fourth main heat exchanger box; 11D. Second cross-floor water box; 11E. Third cross-floor water box; 12. Second side panel; 12A. Second main heat exchanger box; 12B. Second condensate heat exchanger box; 12C. Third main heat exchanger box; 12D. First cross-floor water box; 13. Insulation plate; 14. First stamping Plate; 14A, First stamping groove; 15, Second stamping plate; 15A, Second stamping groove; 20, Heat exchanger; 21, Heat exchange fins; 21A, Through-pipe port; 211, Fin body; 211A, Discharge port; 212, Enclosing part; 212A, Through-pipe port; 2121, Limiting part; 2122, Limiting flange; 22, Heat exchange tube; 221, First main heat exchange tube group; 2211, First main heat exchange tube; 222, Condensing heat exchange tube group; 2221, Condensing heat exchange tube; 223, Second main heat exchange tube group; 2231, Second main heat exchange tube; 2232, Parallel heat exchange tube group.

[0057] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0059] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0060] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0062] This application proposes a gas water heater. In the embodiments of this application, the gas water heater can obtain high-temperature flue gas by combustion heating. Then, by exchanging heat between the high-temperature flue gas and cold water, the heat of the high-temperature flue gas can be transferred to the cold water, thereby raising the temperature of the cold water to produce hot water, that is, to produce the required bathroom water.

[0063] Understandably, gas water heaters can mix gas and air, using the resulting mixture as fuel to achieve complete combustion. Specifically, gas and air can be pre-mixed according to a specific combustion ratio to create the desired fuel. This fuel is then ignited to produce high-temperature flue gas. This achieves a more efficient energy conversion and a combustion process with lower emissions, commonly known as fully premixed technology. Of course, the fuel can also be gas alone; this embodiment does not limit this.

[0064] Please see Figure 1 In this embodiment, the gas water heater includes a housing (not shown in the figure), a water tank assembly 1, and a burner (not shown in the figure). The housing is used to support and install the various components of the gas water heater. The water tank assembly 1 and the burner are respectively disposed inside the housing. The water tank assembly 1 has a flue gas chamber 10A.

[0065] The fuel is fed into the burner and ignited to produce high-temperature flue gas. The high-temperature flue gas then flows into the flue gas chamber 10A to exchange heat with the water flowing through the water tank assembly 1, thereby raising the water temperature to produce the required hot water.

[0066] In this embodiment, the water tank assembly 1 includes a tank body 10 and a heat exchanger 20. The tank body 10 can be made of stainless steel, which has advantages such as better corrosion resistance, better scale resistance, and lower cost. Of course, the tank body 10 can also be made of copper, and this embodiment does not limit this. The tank body 10 can be configured as a cuboid or cube to make the shape more regular, so as to facilitate manufacturing. The tank body 10 has the flue gas chamber 10A mentioned above.

[0067] Heat exchanger 20 is located within flue gas chamber 10A and includes heat exchange tubes 22. The heat exchange tubes 22 can be made of stainless steel, copper, or other metals. Taking stainless steel as an example, heat exchange tubes 22 have advantages such as better corrosion resistance, better scale resistance, and lower cost. Liquid flow channels are formed within the heat exchange tubes 22 for the flow of heat exchange liquid. It can be understood that when high-temperature flue gas flows through the heat exchange tubes 22, it comes into contact with the heat exchange tubes 22, transferring heat to them. Then, the heat exchange tubes 22 exchange heat with the heat exchange liquid, ultimately transferring heat to the heat exchange liquid.

[0068] In order to further improve the heat exchange efficiency between the heat exchanger 20 and the high-temperature flue gas, in this embodiment, the heat exchanger 20 also includes heat exchange fins 21. The heat exchange fins 21 can be made of copper, which has the advantage of better thermal conductivity. Of course, the heat exchange fins 21 can also be made of stainless steel or other metal materials. This embodiment does not limit this.

[0069] Generally, the connection between the heat exchange fins 21 and the heat exchange tubes 22 is usually by welding. Specifically, the heat exchange tubes 22 pass through the heat exchange fins 21 and are welded to the heat exchange fins 21. However, in related technologies, the connection area between the heat exchange tubes 22 and the heat exchange fins 21 is small, resulting in low heat exchange efficiency between the heat exchange tubes 22 and the heat exchange fins 21, which in turn affects the heat exchange efficiency between the two.

[0070] Based on this, please refer to the following: Figures 2-4 In some embodiments, the heat exchange fin 21 includes a fin body 211 and a surrounding member 212. The fin body 211 is the main part of the heat exchange fin 21, and it can be generally rectangular. Therefore, the fin body 211 can have thickness, width and length directions that are perpendicular to each other.

[0071] The enclosure 212 can be annular to enclose the heat exchange tube 22. Specifically, the enclosure 212 is connected to one surface of the fin body 211 in the thickness direction and cooperates with the fin body 211 to form a through-hole 21A for the heat exchange tube 22 to pass through. It is understood that solder will fill the gap between the through-hole 21A and the heat exchange tube 22 so that the outer wall of the heat exchange tube 22 can be welded to the wall of the through-hole 21A, thereby realizing the welding of the heat exchange fin 21 and the heat exchange tube 22.

[0072] However, the inventors discovered during the production and manufacturing process that the solder could not fill the gap between the heat exchange tube 22 and the through-hole 21A well. This would reduce the connection area between the heat exchange tube 22 and the through-hole 21A, resulting in both low heat transfer efficiency between the heat exchange tube 22 and the heat exchange fins 21 and poor stability of the connection between the heat exchange tube 22 and the heat exchange fins 21.

[0073] Based on this, please refer to the following: Figures 2-4 In this embodiment, the enclosure 212 has a material passage 212A, which communicates with the pipe passage 21A. The material passage 212A can be a notch on the edge of the enclosure 212 or an opening on the outer side of the enclosure 212; this embodiment does not limit this. The material passage 212A is used to allow solder to flow into the gap between the pipe passage 21A and the heat exchange tube 22. Thus, the solder can first flow into the enclosure 212, and then continue to flow through the material passage 212A of the enclosure 212 to the gap between the pipe passage 21A and the heat exchange tube 22. Then, by high-temperature heating, the solder located in the gap between the pipe passage 21A and the heat exchange tube 22 melts. After subsequent cooling and solidification, the solder can be connected to the wall of the pipe passage 21A and the outer wall of the heat exchange tube 22, thereby achieving the welding of the heat exchange fins 21 and the heat exchange tube 22.

[0074] The technical solution of this application utilizes the cooperation between the fin body 211 and the enclosure 212 to construct the through port 21A, and the enclosure 212 has a material through port 212A, so that the heat exchange fins 21 of this embodiment have at least the following technical effects:

[0075] First, based on the fin body 211, a enclosure 212 connected to the fin body 211 is provided, and the enclosure 212 cooperates with the fin body 211 to form a through-hole 21A, thereby increasing the depth of the through-hole 21A and increasing the connection area between the through-hole wall of the through-hole 21A and the outer wall of the heat exchange tube 22. This not only improves the heat transfer efficiency of the heat exchange tube 22 and the heat exchange fin 21, but also helps to improve the stability of the connection between the heat exchange tube 22 and the heat exchange fin 21.

[0076] Secondly, by providing a feed port 212A on the enclosure 212, the solder can flow through the feed port 212A to the gap between the tube port 21A and the heat exchange tube 22. This allows the solder to fill the gap between the tube port 21A and the heat exchange tube 22 as much as possible, reducing the probability of the gap being partially unfilled with solder. This increases the connection area between the tube port 21A and the outer tube wall of the heat exchange tube 22, thereby improving the heat transfer efficiency of the heat exchange tube 22 and the heat exchange fins 21, and also improving the stability of the connection between the heat exchange tube 22 and the heat exchange fins 21.

[0077] Please refer to the following: Figures 2-4 In some embodiments, there are multiple material passages 212A, such as two, three, or four, etc. This embodiment does not limit this. The multiple material passages 212A are arranged at intervals along the circumference of the enclosure 212.

[0078] In this way, the solder can flow through multiple through ports 212A to the gap between the through port 21A and the heat exchange tube 22, thereby increasing the probability that the solder will fill the gap between the through port 21A and the heat exchange tube 22. This helps to increase the connection area between the through port 21A and the outer wall of the heat exchange tube 22, further improving the heat transfer efficiency of the heat exchange tube 22 and the heat exchange fins 21, and enhancing the stability of the connection between the heat exchange tube 22 and the heat exchange fins 21.

[0079] It is understandable that if there are too many feed ports 212A, such as four or five, the wall area of ​​the feed port 21A constructed by the enclosure 212 will be too small, resulting in insufficient contact area with the heat exchange tube 22. This will result in low heat transfer efficiency between the enclosure 212 and the heat exchange tube 22, and poor connection stability.

[0080] Based on this, please refer to the following: Figures 2-4 Furthermore, there are two feed ports 212A, which are axially symmetrically distributed. In this embodiment, the solder can flow through the two feed ports 212A to the gap between the through port 21A and the heat exchange tube 22. The axially symmetrical distribution of the two feed ports 212A allows the solder to flow as close to each other as possible in the circumferential direction of the through port 21A, so as to fill the gap between the through port 21A and the heat exchange tube 22 as much as possible. On this basis, the number of feed ports 212A is not excessive, thereby preventing the contact area between the through port 21A and the heat exchange tube 22 from being too small due to an excessive number of feed ports 212A. This is beneficial to ensuring the heat transfer efficiency and connection stability between the casing and the heat exchange tube 22.

[0081] Please refer to the following: Figures 2-4 In some embodiments, the feed port 212A is formed on the edge of the enclosure 212 away from the fin body 211 along the thickness direction. This form of feed port 212A, compared to the form of forming it on the edge of the enclosure 212 closer to the fin body 211, facilitates the processing and manufacturing of the heat exchange fins 21, thereby effectively reducing the processing and manufacturing costs.

[0082] In some embodiments, the feed port 212A does not extend to the intersection line of the enclosure 212 and the fin body 211. This arrangement ensures that the enclosure 212 is continuously arranged rather than partially disconnected, thereby achieving a flow interception effect and preventing the solder from flowing directly from the feed port 212A to the area outside the gap instead of flowing to the gap between the feed port 21A and the heat exchange tube 22.

[0083] Please refer to the following: Figures 2-4In some embodiments, the feed port 212A is an arc-shaped opening formed by a recess in the thickness direction towards the fin body 211. This makes the shape of the feed port 212A more regular, which is convenient for processing. Furthermore, the recessed design of the feed port 212A towards the fin body 211 allows for a larger opening area, i.e., the feed port 212A is flared, thereby increasing the flow rate of solder from the feed port 212A to the gap between the tube port 21A and the heat exchange tube 22, and thus increasing the probability that the solder will fill the gap between the tube port 21A and the heat exchange tube 22.

[0084] Please refer to the following: Figures 2-4 In some embodiments, the feed port 212A does not extend to the intersection line of the enclosure 212 and the fin body 211. This arrangement allows the enclosure 212 to be continuously arranged rather than partially disconnected, thereby achieving a flow interception effect and preventing the solder from flowing directly from the feed port 212A to the area outside the gap instead of flowing to the gap between the feed port 21A and the heat exchange tube 22.

[0085] Furthermore, the feed port 212A is an arc-shaped opening formed by a recess in the thickness direction towards the fin body 211. This makes the shape of the feed port 212A more regular, which is convenient for processing. In addition, the design of the feed port 212A being recessed in the direction towards the fin body 211 allows the opening area of ​​the feed port 212A to be larger, that is, the feed port 212A is flared, which can increase the flow rate of solder from the feed port 212A to the gap between the tube port 21A and the heat exchange tube 22, thereby increasing the probability that the solder will fill the gap between the tube port 21A and the heat exchange tube 22.

[0086] Please see Figure 5 In some embodiments, the heat exchange fins 21 include multiple heat exchange fins 21 arranged at intervals along the thickness direction, and each heat exchange fin 21 has a discharge port 211A, which is connected to the feed port 212A.

[0087] The discharge ports 211A of the multiple heat exchange fins 21 are aligned along the thickness direction to hold solder. It is understood that the solder is arranged in strips, and with the coordination of the discharge ports 211A of the multiple heat exchange fins 21, the strip-shaped solder can be directly placed on the discharge ports 211A of the multiple heat exchange fins 21, so that it enters the welding furnace along with the heat exchanger 20. Subsequent solder can also flow along the feed port 212A to the gap between the feed port 21A and the tube.

[0088] Please refer to the following: Figures 5-7Furthermore, for the same heat exchange fin 21, the discharge port 211A and the feed port 212A are located on the same radial direction as the feed port 21A. In this way, the solder placed in the discharge port 211A can flow from the discharge port 211A to the feed port 212A with a shorter path, effectively shortening the flow path length of the solder. This effectively reduces the probability that the solder may solidify prematurely due to heat loss in an excessively long flow path, resulting in it not flowing to the gap between the feed port and the heat exchange tube 22.

[0089] In some embodiments, the enclosure 212 includes multiple enclosures. It is understood that the fin body 211 cooperates with multiple enclosures 212 to form multiple through ports 21A. Correspondingly, multiple heat exchange tubes 22 are also inserted through multiple through ports 21A.

[0090] Multiple enclosure components 212 are arranged in at most two rows, meaning they can be arranged in one or two rows. The at most two rows of enclosure components 212 are spaced apart along the width direction, and each row includes multiple enclosure components 212 spaced apart along the length direction. Multiple discharge ports 211A are included, with one discharge port 211A corresponding to one enclosure component 212. This arrangement allows multiple heat exchange tubes 22 to pass through a single heat exchange fin 21, improving overall heat exchange efficiency. Furthermore, the arrangement of multiple discharge ports 211A and multiple enclosure components 212 ensures that solder placed at different discharge ports 211A can flow to their corresponding through ports 212A, guaranteeing that the solder can fill the gap between each heat exchange tube 22 and its corresponding through port 21A as much as possible.

[0091] Please refer to the following: Figures 6-7 In some embodiments, the heat exchange fins 21 include a plurality of heat exchange fins 21, which are arranged at intervals along the thickness direction, and the enclosure members 212 of the plurality of heat exchange fins 21 are all provided with limiting portions 2121.

[0092] In this configuration, along the arrangement direction of the multiple heat exchange fins 21, the limiting part 2121 of any heat exchange fin 21 is used to limit and block the heat exchange fin 21 adjacent to it.

[0093] In this way, based on the limiting and blocking, it can be ensured that the fin bodies 211 of multiple heat exchange fins 21 are distributed with the same spacing as much as possible, so that the heat exchange tubes 22 passing through multiple heat exchange fins 21 have the same heat exchange efficiency with high temperature flue gas in each area in the arrangement direction of multiple heat exchange fins 21, thereby improving the uniformity of heat exchange effect.

[0094] Please refer to the following: Figure 4 , Figure 6 as well as Figure 7Furthermore, the limiting part 2121 is a limiting flange 2122, which is formed on the edge of the enclosure 212 away from the fin body 211 along the thickness direction. It can be understood that the limiting flange 2122 can be formed by stamping and folding a part of the enclosure 212 itself, thereby reducing the assembly steps between the limiting flange 2122 and the enclosure 212. On the basis that the limiting flange 2122 and the enclosure 212 are integral components, the strength of the connection between the limiting flange 2122 and the enclosure 212 can be effectively guaranteed.

[0095] The limiting flange 2122 is set at an angle to the enclosing member 212, for example, at a 90-degree angle, in which case the limiting flange 2122 and the enclosing member 212 are perpendicular. In the radial direction of the through-hole 21A, the limiting flange 2122 extends away from the through-hole 21A to avoid interfering with the passage of the heat exchange tube 22. Thus, the limiting flange 2122 blocks the heat exchange fins 21, ensuring that the fin bodies 211 of multiple heat exchange fins 21 are distributed at the same spacing. Furthermore, the limiting flange 2122 has a simple structure, facilitating manufacturing and production.

[0096] Optionally, a plurality of spaced-apart limiting portions 2121 are provided on the same enclosure 212, for example, a plurality of spaced-apart limiting flanges 2122 are provided along the circumference of the enclosure 212. In this embodiment, by providing a plurality of limiting portions 2121, adjacent heat exchange fins 21 can be limited and blocked in the circumference of the enclosure 212, so as to further ensure that the fin bodies 211 of the plurality of heat exchange fins 21 can be distributed at the same spacing.

[0097] Please refer to the following: Figures 8-10 In some embodiments, the housing 10 further includes a smoke inlet 10B and a smoke outlet 10C, both of which are connected to the flue gas chamber 10A. In one example, the smoke inlet 10B and the smoke outlet 10C share the same opening. That is, after the flue gas flows into the flue gas chamber 10A from the smoke inlet 10B, it changes direction and flows back when it reaches the bottom wall of the flue gas chamber 10A, eventually exiting from the smoke outlet 10C. In this case, the smoke inlet 10B and the smoke outlet 10C share the same opening. In another example, the smoke inlet 10B and the smoke outlet 10C are located on opposite sides of the housing 10. In this case, after the flue gas flows into the flue gas chamber 10A from the smoke inlet 10B, it does not change direction and flows out through the smoke outlet 10C. In this case, the smoke inlet 10B and the smoke outlet 10C have different openings.

[0098] The heat exchange tubes 22 include multiple tubes, and the multiple heat exchange tubes 22 include a first main heat exchange tube group 221 and a condenser heat exchange tube group 222. The condenser heat exchange tube group 222 is located on the side of the first main heat exchange tube group 221 facing away from the flue gas inlet 10B. The first main heat exchange tube group 221 can be configured in series or parallel water circuits, and the condenser heat exchange tube group 222 can also be configured in series or parallel water circuits; this embodiment does not impose any restrictions on this.

[0099] Understandably, after the flue gas flows into the flue gas chamber 10A from the inlet 10B, it first exchanges heat with the first main heat exchange tube group 221 to heat the heat exchange liquid flowing through it. After the heat exchange is complete, although the temperature of the flue gas has decreased, it still contains a certain amount of heat. Therefore, as the flue gas continues to flow, when it flows through the condenser heat exchange tube group 222, it further exchanges heat with the heat exchange liquid flowing through it, transferring the remaining heat in the flue gas (the heat released when water vapor in the flue gas condenses) to the heat exchange liquid flowing through it, thus heating the liquid. In this way, most of the heat from the flue gas can be utilized to heat the heat exchange liquid, effectively improving the heat exchange efficiency and achieving energy saving and environmental protection effects.

[0100] Please refer to the following: Figures 8-10 Optionally, the housing 10 includes a first side plate 11 and a second side plate 12. The first side plate 11 and the second side plate 12 cooperate to form a portion of the flue gas chamber 10A, and the first side plate 11 and the second side plate 12 can be arranged opposite to each other. The first side plate 11 has multiple first main hot water exchange boxes 11A, and the second side plate 12 has multiple second main hot water exchange boxes 12A. It is understood that the first main hot water exchange boxes 11A and the second main hot water exchange boxes 12A have a certain volume to provide a certain water storage function.

[0101] The first main heat exchange tube assembly 221 includes multiple first main heat exchange tubes 2211, with each first main heat exchange tube 2211 connected to a first main heat exchange water box 11A and a second main heat exchange water box 12A, so that the multiple first main heat exchange tubes 2211 are connected in series to form a series water circuit. In this way, compared to a parallel water circuit, the series water circuit avoids the occurrence of empty tubes or water accumulation in some first main heat exchange tubes 2211 due to insufficient heat exchange liquid flow or slow flow velocity. This reduces water vaporization and scaling within the first main heat exchange tubes 2211, effectively lowering the risk of damage to the first main heat exchange tubes 2211, extending the service life of the first main heat exchange tube assembly 221, and also preventing the water tank assembly 1 from exploding, ensuring the safety of the water tank assembly 1.

[0102] Please refer to the following: Figures 8-9In some structural forms, the housing 10 also includes two heat insulation plates 13, which are arranged opposite to each other and spaced apart. Each heat insulation plate 13 is connected between the first side plate 11 and the second side plate 12, so that the two heat insulation plates 13, the first side plate 11 and the second side plate 12 cooperate to form at least part of the flue gas chamber 10A.

[0103] In this way, by setting up two heat insulation plates 13, the heat of the flue gas can be reduced from escaping outward, thereby effectively improving the heat exchange efficiency.

[0104] Please see Figure 10 Furthermore, the multiple first main heat exchange tubes 2211 are arranged in at least two rows, and each row includes multiple first main heat exchange tubes 2211 arranged at intervals. For example, when the multiple first main heat exchange tubes 2211 are arranged in two rows, the two rows of first main heat exchange tubes 2211 can be simultaneously installed in the same heat exchange fin 21, that is, the heat exchange fin 21 includes two rows of enclosure members 212. This can reduce the number of heat exchange fins 21, eliminating the need for a separate heat exchange fin 21 to be installed for each first main heat exchange tube 2211, and reducing assembly steps.

[0105] In this configuration, along the arrangement direction of the multiple first main heat exchange tubes 2211 in each row, the multiple first main heat exchange tubes 2211 in adjacent rows are arranged alternately. The first main heat exchange tubes 2211 in the row closer to the flue gas inlet 10B do not excessively interfere with the flow of flue gas to the first main heat exchange tubes 2211 in the other row. Specifically, some flue gas can flow close to the gap between two adjacent first main heat exchange tubes 2211 in the row closer to the flue gas inlet 10B, and then flow directly to one of the first main heat exchange tubes 2211 in the other row. In this way, the uniformity of heat exchange is ensured, and the utilization rate of flue gas is improved. It is worth mentioning that, compared with the staggered arrangement, the alternating arrangement does not cause the size of the housing 10 in the arrangement direction of the multiple first main heat exchange tubes 2211 in each row to be too large, so as to appropriately reduce the overall size of the housing 10.

[0106] Of course, this application is not limited to this. In other embodiments, along the arrangement direction of the plurality of first main heat exchange tubes 2211 in each row, the plurality of first main heat exchange tubes 2211 in adjacent rows may also be arranged in an alternating manner.

[0107] To meet the requirements of a larger water output from a gas water heater, please refer to the following: Figures 8-10 Furthermore, the first side plate 11 also has multiple first condensing water exchange boxes 11B, and the second side plate 12 also has multiple second condensing water exchange boxes 12B. It can be understood that the first main water exchange box 11A and the second main water exchange box 12A have a certain volume so as to play a certain water storage function.

[0108] The condenser heat exchanger tube assembly 222 includes multiple condenser heat exchanger tubes 2221, and at least two condenser heat exchanger tubes 2221 are connected to a first condenser heat exchanger box 11B and a second condenser heat exchanger box 12B respectively. Thus, compared to a series water circuit, this embodiment increases the flow rate of the heat exchange liquid through at least two condenser heat exchanger tubes 2221, thereby increasing the water output of the gas water heater.

[0109] Furthermore, since the condenser heat exchanger tube group 222 is located on the side of the first main heat exchanger tube group 221 facing away from the flue gas inlet 10B, the temperature of the flue gas has already decreased after flowing through the first main heat exchanger tube group 221. Therefore, even if there is a phenomenon of low flow rate and slow flow velocity of heat exchange liquid in some condenser heat exchanger tubes 2221, the adverse effects of flue gas on condenser heat exchanger tubes 2221 will be reduced. In this way, the requirement of large water output can be met while reducing the risk of damage to condenser heat exchanger tubes 2221.

[0110] Please refer to the following: Figures 8-10 In some embodiments, one of the first side plate 11 and the second side plate 12 is further provided with a first cross-layer water box 12D. The first cross-layer water box 12D is connected to one of the condenser heat exchange tubes 2221 and to one of the first main heat exchange tubes 2211. In this way, the heat exchange liquid of the condenser heat exchange tube group 222 can flow to the first main heat exchange tube group 221, thereby improving the utilization rate of heat from the flue gas and thus improving the heating efficiency of the flue gas on the heat exchange liquid.

[0111] Please refer to the following: Figures 8-10 In some embodiments, the second side plate 12 also has a third main hot water exchange box 12C, and the first side plate 11 has at least two fourth main hot water exchange boxes 11C. It is understood that the third main hot water exchange box 12C and the fourth main hot water exchange box 11C have a certain volume so as to play a certain water storage function.

[0112] The plurality of heat exchange tubes 22 also includes a second main heat exchange tube group 223, which is located on the side of the first main heat exchange tube group 221 facing the flue gas inlet 10B. The second main heat exchange tube group 223 has a plurality of second main heat exchange tubes 2231, and at least two second main heat exchange tubes 2231 form a parallel heat exchange tube group 2232.

[0113] The parallel heat exchanger tube assembly 2232 includes two sets, one of which is connected at both ends to the third main heat exchanger box 12C and one of the fourth main heat exchanger boxes 11C, respectively, and the other set is connected at both ends to the third main heat exchanger box 12C and another fourth main heat exchanger box 11C, respectively. The two sets of parallel heat exchanger tube assemblies 2232 are spaced apart from each other in the direction from the first side plate 11 to the second side plate 12, and are respectively located adjacent to the first side plate 11 and the second side plate 12.

[0114] Understandably, as the flue gas flows in through the inlet 10B, a portion of the flue gas will flow to the second main heat exchanger tube group 223, and then sequentially to the first main heat exchanger tube group 221 and the condenser heat exchanger tube group 222. The other portion of the flue gas will flow through the gap between the two parallel heat exchanger tube groups 2232 to the first main heat exchanger tube group 221, and then from the first main heat exchanger tube group 221 to the condenser heat exchanger tube group 222.

[0115] Thus, by adding a second main heat exchange tube group 223, the overall heat exchange efficiency between the heat exchanger 20 and the flue gas can be improved. Furthermore, by setting up parallel heat exchange tube groups 2232, the heat exchange liquid flowing through the second main heat exchange tube group 223 can flow back and forth, thereby improving the heat exchange efficiency between the heat exchange liquid flowing through the second main heat exchange tube group 223 and the flue gas.

[0116] Furthermore, the spacing between the two sets of parallel heat exchange tube groups 2232 ensures that the second main heat exchange tube group 223 will not obstruct the flue gas flowing to the first main heat exchange tube group 221 too much, thereby effectively ensuring the overall heat exchange efficiency between the heat exchanger 20 and the flue gas.

[0117] Please refer to the following: Figures 8-10 In some embodiments, one of the first side plate 11 and the second side plate 12 is further provided with a second cross-layer water box 11D. The second cross-layer water box 11D is connected to one of the first main heat exchange tubes 2211 in one row and to one of the first main heat exchange tubes 2211 in another row, so that the heat exchange liquid can flow from the first main heat exchange tubes 2211 in the row that is farther away from the flue gas inlet 10B to the other row of first main heat exchange tubes 2211. In this way, the utilization rate of heat from the flue gas can be improved, thereby improving the heating efficiency of the flue gas on the heat exchange liquid.

[0118] Please refer to the following: Figures 8-10 Furthermore, one of the first side plate 11 and the second side plate 12 is also provided with a third cross-layer water box 11E. The third cross-layer water box 11E is connected to one of the first main heat exchange tubes 2211 in a row closer to the flue gas inlet 10B, and is also connected to a group of parallel heat exchange tubes 2232 in the second main heat exchange tube group 223, so that the heat exchange liquid can flow from the first main heat exchange tubes 2211 in a row closer to the flue gas inlet 10B to the second main heat exchange tube group 223. In this way, the heat exchange liquid of the first heat exchange tube group 22 can flow to the second main heat exchange tube group 223, thereby improving the utilization rate of the heat of the flue gas and thus improving the heating efficiency of the flue gas on the heat exchange liquid.

[0119] Please refer to the following: Figures 8-9Furthermore, the housing 10 also has an inlet 10D and an outlet 10E. The inlet 10D is connected to the first condensing heat exchanger box 11B, and the outlet 10E is connected to the fourth main heat exchanger box 11C. In this way, the heat exchange liquid can flow sequentially through the inlet 10D, the condensing heat exchanger tube group 222, the first main heat exchanger tube group 221, the second main heat exchanger tube group 223, and the outlet 10E, so as to realize the circulation of the heat exchange liquid in multiple heat exchanger tubes 22, thereby improving the heat utilization rate of the flue gas.

[0120] The inlet 10D can also be replaced by connecting to the second condenser heat exchanger box 12B. In this way, the inlet 10D and the outlet 10E are located on different sides of the box 10, so as to facilitate the pipeline layout of connecting the inlet 10D and the outlet 10E, and leave enough space for disassembly and assembly.

[0121] Please refer to the following: Figures 11-12 In some embodiments, both the first side plate 11 and the second side plate 12 include a first stamping plate 14 and a second stamping plate 15. The first stamping plate 14 and the second stamping plate 15 are connected. The first stamping plate 14 is recessed in a direction away from the second stamping plate 15 to form a first stamping groove 14A, and the second stamping plate 15 is recessed in a direction away from the first stamping plate 14 to form a second stamping groove 15A.

[0122] Wherein, after the first stamping plate 14 and the second stamping plate 15 are connected, the first stamping groove 14A and the second stamping groove 15A are connected to form a water box 10F. The water box 10F may include, but is not limited to, at least a portion of the first main hot water exchange box 11A, at least a portion of the second main hot water exchange box 12A, the first condensing hot water exchange box 11B, the second condensing hot water exchange box 12B, the third main hot water exchange box 12C, and the fourth main hot water exchange box 11C.

[0123] Understandably, during the actual forming process of the first stamping groove 14A and the second stamping groove 15A, the press and the die can be used to apply deformation force to the first stamping plate 14 and the second stamping plate 15 respectively, so that the first stamping groove 14A and the second stamping groove 15A are formed correspondingly on the surface of the first stamping plate 14 and the surface of the second stamping plate 15 respectively. In this way, the dimensional and shape accuracy of the first stamping groove 14A and the second stamping groove 15A can be guaranteed, while facilitating the direct forming of the first stamping groove 14A and the second stamping groove 15A, thereby improving production efficiency.

[0124] After the first stamping plate 14 and the second stamping plate 15 are connected, the first stamping groove 14A and the second stamping groove 15A communicate to form a water box 10F. For example, the first stamping plate 14 and the second stamping plate 15 can be connected by welding, screwing, etc., and after the connection, the first stamping groove 14A can be opposite to the second stamping groove 15A to achieve communication.

[0125] In this way, the first stamping groove 14A and the second stamping groove 15A can be formed on the first stamping plate 14 and the second stamping plate 15 respectively. This allows for the formation of two stamping grooves on two separate plates, while simultaneously forming the water tank 10F, thus preventing the water tank 10F from being formed on a single plate. This increases the success rate of side plate production and improves the yield rate. Furthermore, obtaining a larger capacity water tank 10F also increases the overall water output of the water tank assembly 1, better meeting the requirements of a gas water heater and improving the user experience.

[0126] In some embodiments, the first stamping groove 14A has a first notch facing the second stamping plate 15, and the second stamping groove 15A has a second notch facing the first stamping groove 14A. Exemplarily, when projected along the direction from the second stamping plate 15 to the first stamping plate 14, the projection of the second stamping groove 15A is located within the first stamping groove 14A, or a portion of the projection of the second stamping groove 15A is located within the first stamping groove 14A.

[0127] In this design, the surface of the first stamping plate 14 with the first groove is sealed against the surface of the second stamping plate 15 with the second groove. This reduces the likelihood of heat exchange fluid leaking out through the gap between the surfaces of the first stamping plate 14 and the second stamping plate 15, preventing leakage and improving the quality of the water tank assembly 1. Furthermore, the direct sealing between the two eliminates the need for dedicated sealing components, reducing both the number of structural elements and assembly steps.

[0128] Of course, this application is not limited to this. In other embodiments, a sealing element may be provided between the surface of the first stamping plate 14 facing the second stamping plate 15 and the gap between the second stamping plate 15 and the first stamping plate 14.

[0129] Furthermore, when projecting along the direction from the second stamping plate 15 to the first stamping plate 14, the projection of the second stamping groove 15A is located within the first stamping groove 14A. This facilitates the alignment of the first stamping groove 14A and the second stamping plate 15A when connecting the first stamping plate 14 and the second stamping plate 15, reducing the difficulty of connection and thus making it easier for the workshop to connect the first stamping plate 14 and the second stamping plate 15.

[0130] Furthermore, compared to the form where part of the projection of the second stamping groove 15A is located within the first stamping groove 14A, in this embodiment, the area opposite to the first stamping groove 14A and the second stamping groove 15A is larger, thereby effectively increasing the capacity of the water box 10F to meet the requirements of large water output of the gas water heater.

[0131] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0132] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat exchange fin, characterized in that, include: The fin body has a thickness direction; and A surround is connected to one side surface of the fin body in the thickness direction and cooperates with the fin body to form a through-hole, which is used for the heat exchange tube to pass through. The enclosure has a material inlet communicating with the through-pipe, and the material inlet is used to allow solder to flow into the gap between the through-pipe and the heat exchange tube.

2. The heat exchange fins as described in claim 1, characterized in that, The material passage includes multiple passages, and the multiple material passages are arranged at intervals along the circumference of the enclosure.

3. The heat exchange fins as described in claim 2, characterized in that, The material passage includes two ports, and the two material passages are symmetrically distributed.

4. The heat exchange fins as described in claim 2, characterized in that, Along the thickness direction, the feed port is located on the edge of the enclosure on the side away from the fin body.

5. The heat exchange fins as described in claim 4, characterized in that, In the thickness direction, the feed port does not extend to the intersection line of the enclosure and the fin body; and / or, The feed port is an arc-shaped opening formed by a recess in the thickness direction toward the fin body.

6. The heat exchange fins as described in claim 1, characterized in that, The heat exchange fins include a plurality of fins, which are arranged at intervals along the thickness direction. Each heat exchange fin has a discharge port, which is connected to the feed port. The discharge ports of the multiple heat exchange fins are aligned along the thickness direction for placing the solder.

7. The heat exchange fins as described in claim 6, characterized in that, For the same heat exchange fin, the discharge port and the feed port are located on the same radial direction of the feed pipe opening.

8. The heat exchange fins as described in claim 6, characterized in that, The fin body also has a width direction and a length direction; the enclosure includes a plurality of enclosures, the plurality of enclosures are arranged in at most two rows, the at most two rows of enclosures are spaced apart along the width direction, and each row includes a plurality of enclosures spaced apart along the length direction; The material discharge port includes multiple ports, and each material discharge port is correspondingly provided with one enclosure component.

9. The heat exchange fin as described in any one of claims 1-8, characterized in that, The heat exchange fins include a plurality of fins, which are arranged at intervals along the thickness direction, and the enclosure of the plurality of heat exchange fins is provided with a limiting part. In this configuration, along the arrangement direction of the plurality of heat exchange fins, the limiting portion of any one of the heat exchange fins is used to limit and block the heat exchange fins adjacent to it.

10. The heat exchange fins as described in claim 9, characterized in that, The limiting part is a limiting flange, which is formed on the edge of the enclosure member away from the fin body along the thickness direction; The limiting flange is set at an angle to the enclosure, and in the radial direction of the pipe opening, the limiting flange extends away from the pipe opening.

11. The heat exchange fins as described in claim 9, characterized in that, The same enclosure component is provided with a plurality of limiting parts arranged at intervals.

12. A heat exchanger, characterized in that, include: The heat exchange fins are as described in any one of claims 1-11; and The heat exchange tube is inserted through the tube opening.

13. A water tank assembly, characterized in that, include: The enclosure has a flue gas chamber; and The heat exchanger as described in claim 12 is disposed within the flue gas chamber.

14. The water tank assembly as claimed in claim 13, characterized in that, The housing also has a flue gas inlet communicating with the flue gas chamber; the heat exchange tubes include multiple tubes, and the multiple heat exchange tubes include: First main heat exchanger tube assembly; and The condenser heat exchanger tube assembly is located on the side of the first main heat exchanger tube assembly facing away from the flue gas inlet.

15. The water tank assembly as claimed in claim 14, characterized in that, The housing includes a first side panel and a second side panel. The first side panel has a plurality of first main hot water exchange boxes, and the second side panel has a plurality of second main hot water exchange boxes. The first main heat exchange tube group includes multiple first main heat exchange tubes, and each first main heat exchange tube is connected to a first main heat exchange water box and a second main heat exchange water box, so that the multiple first main heat exchange tubes are connected in series to form a series water circuit.

16. The water tank assembly as claimed in claim 15, characterized in that, Multiple first main heat exchange tubes are arranged in at least two rows, and each row includes multiple first main heat exchange tubes arranged at intervals. In this arrangement, along the direction of the arrangement of the multiple first main heat exchange tubes in each row, the multiple first main heat exchange tubes in adjacent rows are arranged alternately.

17. The water tank assembly as claimed in claim 15, characterized in that, The first side plate also has multiple first condensing water exchange boxes, and the second side plate also has multiple second condensing water exchange boxes; The condenser heat exchanger tube assembly includes multiple condenser heat exchanger tubes, and at least two of the condenser heat exchanger tubes are connected to a first condenser heat exchanger box and a second condenser heat exchanger box.

18. The water tank assembly as claimed in claim 15, characterized in that, The second side panel also has a third main hot water exchange box, and the first side panel has at least two fourth main hot water exchange boxes; The plurality of heat exchange tubes further includes a second main heat exchange tube group, which is located on the side of the first main heat exchange tube group facing the flue gas inlet and includes a plurality of second main heat exchange tubes, with at least two second main heat exchange tubes forming a parallel heat exchange tube group. The parallel heat exchange tube assembly includes two sets, one set having its two ends connected to the third main heat exchanger box and one of the fourth main heat exchanger boxes respectively, and the other set having its two ends connected to the third main heat exchanger box and another fourth main heat exchanger box respectively; wherein, the two sets of parallel heat exchange tube assemblies are spaced apart in the direction from the first side plate to the second side plate, and are respectively arranged adjacent to the first side plate and the second side plate.

19. A gas water heater, characterized in that, include: case; The water tank assembly as described in any one of claims 13-18 is disposed within the housing; as well as A burner is disposed within the housing and is capable of generating heat-exchange flue gas flowing into the flue gas chamber.

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