WATER TANK ASSEMBLY AND GAS WATER HEATER

Abstract

A water tank assembly includes a tank body provided with a flue gas chamber and a heat exchanger including a primary heat exchange tube bundle and a condensation tube bundle arranged in sequence along a flue gas inlet direction of the flue gas chamber. The condensation tube bundle includes a plurality of condensation tubes arranged in sequence along the flue gas inlet direction, and each of the plurality of condensation tubes bends and extends along a direction that forms an angle with the flue gas inlet direction.

Claims

1. A water tank assembly comprising: a tank body provided with a flue gas chamber; and a heat exchanger including a primary heat exchange tube bundle and a condensation tube bundle arranged in sequence along a flue gas inlet direction of the flue gas chamber, the condensation tube bundle including a plurality of condensation tubes arranged in sequence along the flue gas inlet direction, and each of the plurality of condensation tubes bending and extending along a direction that forms an angle with the flue gas inlet direction.

2. The water tank assembly of claim 1, wherein each of the plurality of condensation tubes includes: a plurality of straight line segments extending along a first direction and arranged at intervals along a second direction, the first direction and the second direction being perpendicular to the flue gas inlet direction, and an angle being formed between the first direction and the second direction; and one or more curved line segments each connected to adjacent two of the plurality of straight line segments.

3. The water tank assembly of claim 1, wherein along the flue gas inlet direction, adjacent two of the plurality of condensation tubes are at least partially arranged in a staggered pattern.

4. The water tank assembly of claim 1, wherein the plurality of condensation tubes are corrugated tubes.

5. The water tank assembly of claim 1, wherein the tank body is provided with a condenser inlet box and a condenser outlet box, and two ends of each of the plurality of condensation tubes respectively communicate with the condenser inlet box and the condenser outlet box, such that the plurality of condensation tubes are arranged in parallel.

6. The water tank assembly of claim 5, wherein the condenser inlet box and the condenser outlet box are arranged at a same sidewall of the tank body.

7. The water tank assembly of claim 5, wherein: the tank body includes a first sidewall and a second sidewall arranged opposite to each other and extending along the flue gas inlet direction, the first sidewall being provided with a first primary heat exchange water box, the second sidewall being provided with a second primary heat exchange water box, the primary heat exchange tube bundle including a plurality of primary heat exchange tubes, and two ends of each of the plurality of primary heat exchange tubes respectively communicating with the first primary heat exchange water box and the second primary heat exchange water box; and one end of at least one of the plurality of primary heat exchange tubes communicates with the condenser inlet box.

8. The water tank assembly of claim 7, wherein: the first primary heat exchange water box is one of a plurality of first primary heat exchange water boxes provided at the first sidewall, and the second primary heat exchange water box is one of a plurality of second primary heat exchange water boxes provided at the first sidewall; and one of the plurality of primary heat exchange tubes correspondingly communicates with one of the plurality of first primary heat exchange water boxes and one of the plurality of second primary heat exchange water boxes, such that the plurality of primary heat exchange tubes are connected in series to form a series-connected water circuit.

9. The water tank assembly of claim 7, wherein along the flue gas inlet direction, the plurality of primary heat exchange tubes are arranged in at least two rows, and the at least two rows of primary heat exchange tubes are arranged in a staggered pattern.

10. The water tank assembly of claim 7, wherein: the plurality of primary heat exchange tubes are a plurality of first primary heat exchange tubes; the tank body further includes a third sidewall and a fourth sidewall arranged opposite to each other and extending along the flue gas inlet direction, both the third sidewall and the fourth sidewall being positioned between the first sidewall and the second sidewall; the tank body further includes a flue gas inlet communicating with the flue gas chamber; the first sidewall is further provided with a third primary heat exchange water box, the second sidewall is further provided with a fourth primary heat exchange water box, and the primary heat exchange tube bundle further includes a plurality of second primary heat exchange tubes positioned on a side of the plurality of first primary heat exchange tubes near the flue gas inlet; two opposite ends of each of the plurality of second primary heat exchange tubes respectively communicate with the third primary heat exchange water box and the fourth primary heat exchange water box, and at least one of the plurality of second primary heat exchange tubes communicates with the first primary heat exchange water box; and the plurality of second primary heat exchange tubes are separately arranged at the third sidewall and the fourth sidewall.

11. The water tank assembly of claim 10, wherein a radial cross section of each of the plurality of first primary heat exchange tubes and/or each of the plurality of second primary heat exchange tubes is an ellipse with a long axis extending along the flue gas inlet direction.

12. The water tank assembly of claim 1, wherein the heat exchanger further includes a heat exchange fin, the heat exchange fin including: a fin body provided with a plurality of tube pass-through holes that penetrate the fin body along a thickness direction of the fin body, the plurality of tube pass-through holes being provided for the primary heat exchange tube bundle to pass through, and an inflow end and an outflow end of the fin body being arranged with respect to each other along the flue gas inlet direction; a turbulator connected to a surface of a side of the fin body along the thickness direction to obstruct part of flue gas flowing towards the outflow end; and a guide structure connected to the fin body and positioned on a same surface of the fin body as the turbulator, the guide structure being positioned on a side of the turbulator near the inflow end to guide the flue gas towards the turbulator.

13. The water tank assembly of claim 12, wherein the guide structure is an arched structure, and a flow guide channel extending along the flue gas inlet direction is formed inside the arched structure, the turbulator being positioned at an outlet of the flow guide channel.

14. The water tank assembly of claim 13, wherein the flow guide channel has a cross section that gradually tapers from the inflow end to the outflow end.

15. The water tank assembly of claim 13, wherein a surface of the fin body facing away from the guide structure is provided with a flue gas passage communicating with the flow guide channel.

16. The water tank assembly of claim 12, wherein the turbulator includes a turbulator ring and a turbulator plate arranged in sequence along the flue gas inlet direction, an angle being formed between a length extension direction of the turbulator plate and the flue gas inlet direction.

17. The water tank assembly of claim 16, wherein when viewed along the flue gas inlet direction, a projection plane of the turbulator ring is positioned within the turbulator plate.

18. The water tank assembly of claim 16, wherein a surface of the fin body facing away from the guide structure is provided with a flue gas passage communicating with an inner ring of the turbulator ring.

19. The water tank assembly of claim 12, wherein: the heat exchange fin further includes collars each connected to the surface of the side of the fin body along the thickness direction and arranged around a circumference of each tube pass-through hole; or the turbulator is one of a plurality of turbulators provided and the guide structure is one of a plurality of guide structures provided, and one of the plurality of guide structures is correspondingly positioned on a side of one of the plurality of turbulators near the inflow end.

20. A gas water heater comprising: a housing; a water tank assembly arranged inside the housing and including: a tank body provided with a flue gas chamber; and a heat exchanger including a primary heat exchange tube bundle and a condensation tube bundle arranged in sequence along a flue gas inlet direction of the flue gas chamber, the condensation tube bundle including a plurality of condensation tubes arranged in sequence along the flue gas inlet direction, and each of the plurality of condensation tubes bending and extending along a direction that forms an angle with the flue gas inlet direction; and a burner arranged inside the housing and configured to generate heat exchange flue gas flowing towards the flue gas chamber.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] To describe the technical solutions of the embodiments of the present disclosure, the accompanying drawings needed for describing the embodiments will be briefly introduced below. Apparently, the accompanying drawings in the following description are merely some embodiments of the present disclosure. To those of ordinary skills in the art, other accompanying drawings may also be derived from these accompanying drawings without creative efforts.

[0042] FIG. 1 is a schematic structural diagram of a water tank assembly according to an embodiment of the present disclosure;

[0043] FIG. 2 is a schematic structural diagram of the water tank assembly of the present disclosure from another viewing angle;

[0044] FIG. 3 is a cross-sectional view taken along Section A-A in FIG. 2;

[0045] FIG. 4 is a schematic structural diagram of a condensation tube bundle of the water tank assembly in the present disclosure;

[0046] FIG. 5 is a schematic diagram of a partial structure of a heat exchanger of the water tank assembly in the present disclosure;

[0047] FIG. 6 is a schematic structural diagram of a heat exchange fin of the heat exchanger in the present disclosure;

[0048] FIG. 7 is a partial enlarged view of Part A in FIG. 6; and

[0049] FIG. 8 is a schematic structural diagram of the heat exchange fin of the heat exchanger in the present disclosure from another viewing angle.

[0050] Reference numerals in the accompanying drawings:

[0051] water tank assembly 1; tank body 10; first sidewall 11; first primary heat exchange water box 111; third primary heat exchange water box 112; second sidewall 12; second primary heat exchange water box 121; fourth primary heat exchange water box 122; third sidewall 13; fourth sidewall 14; flue gas chamber 10A; flue gas inlet 10B; flue gas outlet 10C; condenser inlet box 10a; condenser outlet box 10b; water inlet 10c; water outlet 10d; heat exchanger 20; primary heat exchange tube bundle 21; first primary heat exchange tube 211; second primary heat exchange tube 212; condensation tube bundle 22; condensation tube 221; straight line segment 2211; curved line segment 2212; heat exchange fin 23; fin body 231; inflow end 231A; outflow end 231B; first flue gas passage 2311; second flue gas passage 2312; tube pass-through hole 2313; turbulator 232; turbulator ring 2321; turbulator plate 2322; guide structure 233; flow guide channel 233A; and collar 234.

[0052] Further description of realization of the objectives and functional characteristics and advantages of the present disclosure will be made with reference to the drawings and in combination with the embodiments.

DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0054] When the accompanying drawings are mentioned in the following descriptions, the same numbers in different drawings represent the same or similar elements, unless otherwise represented. The implementations set forth in the following description of exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects related to the present disclosure as recited in the appended claims.

[0055] In the description of the present disclosure, it should be understood that the terms such as "first and "second are used only for purposes of description and should be understood as indicating or implying relative importance. The specific significations of the above terms in the present disclosure may be understood in the light of specific conditions by persons of ordinary skill in the art. Furthermore, in the description of the present disclosure, unless otherwise specified, "a plurality of" refers to two or more. The and/or used for describing an association relationship between associated objects represents the presence of three relationships. For example, A and/or B may represent the presence of A only, the presence of both A and B, and the presence of B only. Character / generally indicates that an or relationship is present between the associated objects.

[0056] Unless otherwise defined, all technical and scientific terms employed herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms employed in the specification of the present disclosure are merely for the purpose of describing some embodiments and are not intended for limiting the present disclosure. As used herein, the term and/or includes any and all combinations of one or more of the associated listed items.

[0057] The first aspect of the present disclosure proposes a gas water heater. In the embodiments of the present disclosure, the gas water heater can produce high-temperature flue gas with a higher temperature through combustion heating. Next, 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, such that the temperature of the cold water is raised and thus hot water is prepared, that is, required bathroom water is prepared.

[0058] As can be understood, the gas water heater can mix gas with air and use the mixed gas as a fuel to achieve full combustion of the fuel. Specifically, the gas and the air may be premixed according to a specific combustion ratio to become the desired fuel, which is then ignited to produce the high-temperature flue gas. In this way, a combustion process characterized by more efficient energy conversion and lower flue gas emission can be achieved, which is commonly known as a fully premixed technology. Of course, the fuel may also be solely gas, but this embodiment is not limited thereto.

[0059] Referring to FIG. 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 carry and install various components of the gas water heater. The water tank assembly 1 and the burner are separately arranged inside the housing, and the water tank assembly 1 has a flue gas chamber 10A.

[0060] The fuel can be fed into the burner and ignited by the burner to produce the high-temperature flue gas. Next, the high-temperature flue gas can flow into the flue gas chamber 10A to exchange heat with the water flowing through the water tank assembly 1, causing the temperature of the water to rise and thus preparing the required hot water.

[0061] The high-temperature flue gas generated by the burner of the gas water heater may exchange heat with a heat exchange liquid in a heat exchanger 20 to heat the heat exchange liquid.

[0062] However, the heat exchanger 20 includes a primary heat exchange tube and a condensation tube 221. The flue gas first flows through the primary heat exchange tube and then the condensation tube 221. After the flue gas flows through the primary heat exchange tube, the temperature of the flue gas drops, but the flue gas still contains a certain amount of heat energy. Then, the flue gas enters the condensation tube 221. Through a further heat exchange process, the condensation tube 221 collects remaining heat (mainly latent heat released during condensation of water vapor) in the flue gas and transfers it to water. However, the condensation tube 221 cannot fully absorb the heat of the high-temperature hot flue gas, resulting in severe heat loss and low heat exchange efficiency.

[0063] To solve the above problems, referring to FIGS. 1 to 4, the second aspect of the present disclosure proposes a water tank assembly 1. In the embodiments of the present disclosure, the water tank assembly 1 includes a tank body 10 and a heat exchanger 20.

[0064] The tank body 10 may be made of stainless steel material, which has the advantages of better resistance to corrosion, better resistance to scaling, and lower costs, etc. Of course, the tank body 10 may also be made of copper material, but this embodiment is not limited thereto. The tank body 10 may be constructed as a cuboid or a cube to make it more regular in shape and easy for manufacturing and production. The tank body 10 has the flue gas chamber 10A, and the heat exchanger 20 is arranged inside the flue gas chamber 10A. The flue gas chamber 10A has a flue gas inlet direction.

[0065] The heat exchanger 20 includes a primary heat exchange tube bundle 21 and a condensation tube bundle 22 arranged in sequence along the flue gas inlet direction. The condensation tube bundle 22 includes a plurality of condensation tubes 221 arranged in sequence along the flue gas inlet direction, and each of the condensation tubes 221 bends and extends along a direction that forms an angle with the flue gas inlet direction. The primary heat exchange tube bundle 21 and the condensation tube bundle 22 may be tube structures made of metal materials such as stainless steel or copper. For example, the primary heat exchange tube bundle 21 and the condensation tube bundle 22 made of the stainless steel have better resistance to corrosion, better resistance to scaling, and lower costs, etc. A liquid flow channel is formed inside the primary heat exchange tube bundle 21 and the condensation tube bundle 22, to enable the flow of the heat exchange liquid.

[0066] As can be understood, the high-temperature flue gas can come into contact with the primary heat exchange tube bundle 21 and the condensation tube bundle 22 when flowing through the primary heat exchange tube bundle 21 and the condensation tube bundle 22, to transfer heat to the primary heat exchange tube bundle 21 and the condensation tube bundle 22, and then the primary heat exchange tube bundle 21 and the condensation tube bundle 22 exchange heat with the heat exchange liquid, such that the heat is finally transferred to the heat exchange liquid.

[0067] In the water tank assembly 1 and the gas water heater based on the embodiments of the present disclosure, the plurality of condensation tubes 221 of the heat exchanger 20 are arranged in sequence along the flue gas inlet direction of the flue gas chamber 10A of the tank body 10, and each of the condensation tubes 221 bends and extends along a direction that forms an angle with the flue gas inlet direction. In this way, the water tank assembly 1 of this embodiment at least has the following technical effects.

[0068] First, the arrangement mode and the bending shape of the condensation tubes 221 allow the flue gas to come into contact with surfaces of the condensation tubes 221 more fully during its flow process, thereby prolonging the path and time of the heat exchange. Furthermore, as the contact area increases, heat energy in the flue gas can be more fully absorbed by the condensation tubes 221 and transferred to water, thereby reducing waste and loss of the heat energy and improving the heat exchange efficiency. Moreover, the curved paths of the condensation tubes 221 help to guide the flue gas to be more evenly distributed on the surfaces of the condensation tubes 221, thereby reducing local overheating and formation of sediments. Therefore, the water tank assembly 1 of this embodiment not only ensures the efficient heat exchange, but also optimizes energy utilization efficiency, thus providing more energy-saving and efficient hot water usage experience.

[0069] Referring to FIG. 4, in some structural forms, the tank body 10 has a first direction and a second direction arranged perpendicular to the flue gas inlet direction, where an angle is formed between the first direction and the second direction. As can be understood, when the tank body 10 is constructed in a cubic shape, the flue gas inlet direction is a height direction of the tank body 10, and the first direction and the second direction are a length direction and a width direction of the tank body 10, respectively. The condensation tubes 221 include a plurality of straight line segments 2211 and a plurality of curved line segments 2212, where the plurality of straight line segments 2211 extend along the first direction, and are arranged at intervals along the second direction. Each of the plurality of curved line segments 2212 is connected to adjacent two of the plurality of straight line segments 2211. This regular arrangement can further increase the contact area.

[0070] Alternatively, along the flue gas inlet direction, adjacent two of the plurality of condensation tubes 221 are at least partially arranged in a staggered pattern. This staggered arrangement not only increases the relative surface area between the condensation tubes 221, allowing the flue gas to come into contact with the condensation tubes 221 more fully during the flow process to improve the efficiency of heat exchange, but also enhances stability and durability of the entire system. The staggered arrangement design helps to disperse the impact force of the flowing flue gas, reduces direct wear on the condensation tubes 221, and prolongs the service life of the equipment. Meanwhile, this layout also enhances compactness of the structure, allowing more condensation tubes 221 to be housed in a limited space, thereby improving overall heat treatment capacity and efficiency. In addition, the staggered arrangement of the condensation tubes 221 also optimizes an airflow channel, allowing the flue gas to form more complex and varied flow patterns during the flow process, thereby further promoting heat transfer and exchange.

[0071] In some embodiments, the condensation tubes 221 are corrugated tubes. As can be understood, a wrinkled structure is formed on a tube wall of each corrugated tube, where the wrinkled structure can increase the heat exchange area between the corrugated tube and the high-temperature flue gas, thereby improving the efficiency of heat exchange between the corrugated tube and the high-temperature flue gas. In addition, the corrugated tube is lighter in weight and lower in material costs.

[0072] Referring to FIGS. 1 to 4, in some structural forms, the tank body 10 is provided with a condenser inlet box 10a and a condenser outlet box 10b, where two ends of each of the plurality of condensation tubes 221 respectively communicate with the condenser inlet box 10a and the condenser outlet box 10b, such that the plurality of condensation tubes 221 are arranged in parallel. This enables the plurality of condensation tubes 221 to operate in parallel and jointly undertake the task of heat exchange. Compared to a traditional series-connected water circuit, its significant advantage is that it can significantly increase the overall water flow rate. The parallel structure allows the water to flow in a plurality of channels simultaneously, such that water resources can be more effectively utilized, and the heat exchange efficiency can be improved. Furthermore, during operation, each condensation tube 221 generally has a lower temperature than the primary heat exchange tube bundle 21, thus in this parallel arrangement, there is no need to overly worry about the risk of vaporization of the water flow in the condensation tube 221 due to the temperature of the water being too high. This feature not only ensures the stable operation of the system, but also reduces energy losses and safety hazards that may arise from the vaporization.

[0073] Further, the condenser inlet box 10a and the condenser outlet box 10b are arranged at the same sidewall of the tank body 10. This layout not only optimizes an internal spatial structure, but also greatly improves convenience of an installation process. During installation, there is no need to shuttle through a plurality of sidewalls of the tank body 10. Instead, the installation and debugging work for installing the condensation tubes 221 to the condensate feed box and the condenser outlet box can be easily completed by simply focusing on the same sidewall, which not only significantly saves installation time and reduces installation difficulty, but also reduces potential failure risks caused by improper operation, thereby improving the overall utilization efficiency of the water tank assembly 1.

[0074] Referring to FIGS. 1, 2 and 5, alternatively, the tank body 10 includes a first sidewall 11 and a second sidewall 12 arranged opposite to each other and extending along the flue gas inlet direction. The first sidewall 11 is provided with a first primary heat exchange water box 111, and the second sidewall 12 is provided with a second primary heat exchange water box 121. The primary heat exchange tube bundle 21 includes a plurality of first primary heat exchange tubes 211, where two ends of each of the plurality of first primary heat exchange tubes 211 respectively communicate with the first primary heat exchange water box 111 and the second primary heat exchange water box 121. In this way, the first primary heat exchange water box 111 is connected to the second primary heat exchange water box 121 by the plurality of first primary heat exchange tubes 211 to form a heat exchange path. The plurality of first primary heat exchange tubes 211 may be arranged as straight tubes to make processing easier. One end of at least one of the plurality of first primary heat exchange tubes 211 communicates with the condenser inlet box 10a. During this process, the heat exchange liquids smoothly exchange heat between the primary heat exchange tubes, the first primary heat exchange water box 111 and the second primary heat exchange water box 121, to effectively transfer and release the heat. After these heat exchange liquids complete the initial heat exchange, they may flow, along at least one of the plurality of first primary heat exchange tubes 211, towards the condenser inlet box 10a to further perform the heat exchange in the plurality of condensation tubes 221. This design not only improves the heat exchange efficiency of the entire system, but also maximizes utilization of the heat exchange liquids, thereby reducing energy waste. It should be noted that the condenser inlet box 10a and the condenser outlet box 10b may be simultaneously provided at the first sidewall 11 or the second sidewall 12 to facilitate the processing.

[0075] Further, a plurality of first primary heat exchange water boxes 111 and a plurality of second primary heat exchange water boxes 121 are provided, and one of the plurality of first primary heat exchange tubes 211 correspondingly communicates with one of the plurality of first primary heat exchange water boxes 111 and one of the plurality of second primary heat exchange water boxes 121, such that the plurality of first primary heat exchange tubes 211 are connected in series to form a series-connected water circuit. Compared to the parallel-connected water circuit, the series-connected water circuit can avoid the occurrence of a phenomenon of incomplete water filling or water flow stagnation in some of the first primary heat exchange tubes 211 caused by a lower flow rate and slower flow velocity of the heat exchange liquid in the first primary heat exchange tubes 211, which thereby can slow down vaporization and scaling of water in the first primary heat exchange tubes 211, effectively reduce the risk of causing damage to the first primary heat exchange tubes 211, prolong the service life of the primary heat exchange tube bundle 21, avoid the occurrence of explosion of the water tank assembly 1, and thus ensure safety in use of the water tank assembly 1.

[0076] Alternatively, along the flue gas inlet direction, the plurality of first primary heat exchange tubes 211 are arranged in at least two rows, and the at least two rows of first primary heat exchange tubes 211 are arranged in a staggered pattern. The staggered arrangement of the first primary heat exchange tubes 211 allows the flue gas to come into contact with the first primary heat exchange tubes 211 more fully when the flue gas flows through the first primary heat exchange tubes 211, increasing the heat exchange area and thus promoting effective heat transfer. Furthermore, this layout also helps to reduce eddies and dead corners in the flow of the flue gas, and improves flow uniformity of the flue gas and uniformity of the heat exchange.

[0077] Referring to FIGS. 1 to 3, alternatively, the tank body 10 further includes a third sidewall 13 and a fourth sidewall 14 arranged opposite to each other and extending along the flue gas inlet direction, where both the third sidewall 13 and the fourth sidewall 14 are positioned between the first sidewall 11 and the second sidewall 12. The tank body 10 further has a flue gas inlet 10B and a flue gas outlet 10C, where both the flue gas inlet 10B and the flue gas outlet 10C communicate with the flue gas chamber 10A. As an example, the flue gas inlet 10B and the flue gas outlet 10C are the same opening. That is, after the flue gas flows into the flue gas chamber 10A through the flue gas inlet 10B, the flue gas changes its flow direction and turns back when the flue gas reaches a bottom wall of the flue gas chamber 10A, and then the flue gas flows out of the flue gas outlet 10C. In this case, the flue gas inlet 10B and the flue gas outlet 10C are the same opening. For another example, the flue gas inlet 10B and the flue gas outlet 10C are positioned on two opposite sides of the tank body 10. In this case, after the flue gas flows into the flue gas chamber 10A through the flue gas inlet 10B, its flow direction does not change, and the flue gas flows out through the flue gas outlet 10C. Therefore, the flue gas inlet 10B and the flue gas outlet 10C are different openings in this case.

[0078] The first sidewall 11 is also provided with a third primary heat exchange water box 112, and the second sidewall 12 is also provided with a fourth primary heat exchange water box 122. The primary heat exchange tube bundle 21 also includes a plurality of second primary heat exchange tubes 212 positioned on a side of the plurality of first primary heat exchange tubes 211 near the flue gas inlet 10B, where two opposite ends of each of the plurality of second primary heat exchange tubes 212 respectively communicate with the third primary heat exchange water box 112 and the fourth primary heat exchange water box 122, and at least one of the plurality of second primary heat exchange tubes 212 communicates with the first primary heat exchange water box 111. The plurality of second primary heat exchange tubes 212 are separately arranged at the third sidewall 13 and the fourth sidewall 14.

[0079] In this way, the plurality of second primary heat exchange tubes 212 are arranged at the third sidewall 13 and the fourth sidewall 14. This arrangement can avoid obstructing the flue gas from flowing towards the first primary heat exchange tube 211, thereby ensuring smooth and efficient flow of the flue gas. Furthermore, this layout also promotes the uniformity and stability of the heat exchange process, allows each primary heat exchange tube bundle 21 to fully utilize its heat exchange efficiency, and avoids problems of local overheating or uneven cooling.

[0080] When flowing into the tank body 10 through the flue gas inlet 10B, the high-temperature flue gas first comes into contact with the plurality of second primary heat exchange tubes 212 for preliminary heat exchange, which effectively reduces the temperature of the flue gas and lays a good foundation for subsequent cooling and heat recovery. Subsequently, the preliminarily cooled flue gas continues flowing through the plurality of first primary heat exchange tubes 211 for deeper heat exchange, thereby achieving efficient transfer and utilization of heat.

[0081] Still further, the tank body 10 also has a water inlet 10c and a water outlet 10d, where the water inlet 10c communicates with the condenser inlet box 10a, and the water outlet 10d communicates with the fourth primary heat exchange water box. In this way, the heat exchange liquid can flow through the water inlet 10c, the condensation tube bundle 22, the primary heat exchange tube bundle 21, and the water outlet 10d in sequence, thereby achieving circulation of the heat exchange liquid in the primary heat exchange tube bundle 21 and the condensation tube bundle 22 to improve the heat utilization efficiency of the flue gas. The condenser inlet box 10a and the fourth primary heat exchange water box are positioned on the same side of the tank body 10, making it easier for them to connect to external pipelines.

[0082] Further, the radial cross section of each first primary heat exchange tube 211 or second primary heat exchange tube 212 is an ellipse whose long axis extends along the flue gas inlet direction. When the first primary heat exchange tube 211 is an elliptical tube, compared to traditional circular heat exchange tubes, the elliptical tube can accommodate more first primary heat exchange tubes 211 within the same width range. This compact and ordered arrangement not only optimizes space utilization, but also directly increases the heat exchange area, making the heat exchange process more efficient and sufficient. When the high-temperature flue gas passes through, it can come into contact with the surface of the heat exchange tube more broadly, thereby achieving faster heat transfer and more efficient energy recovery. When the second primary heat exchange tube 212 is an elliptical tube, compared to traditional circular heat exchange tubes, the elliptical tube can increase the contact area of the flue gas, and can further reduce the obstruction of the flue gas flowing towards the first primary heat exchange tube 211. Of course, in some embodiments, the radial cross sections of the first primary heat exchange tube 211 and the second primary heat exchange tube 212 may be both designed as the ellipses to achieve spatial optimization, heat exchange efficiency improvement, and energy consumption reduction.

[0083] Referring to FIGS. 4 to 6, in some structural forms, the heat exchanger 20 also includes a heat exchange fin 23, which may be made of copper materials to have better thermal conductivity. Of course, the heat exchange fin 23 may also be made of other metal materials such as stainless steel, but this embodiment is not limited thereto.

[0084] The heat exchange fin 23 includes a fin body 231, a turbulator 232, and a guide structure 233.

[0085] As a main body of the heat exchange fin 23, the fin body 231 may be roughly rectangular in shape. Therefore, the fin body 231 may have a thickness direction, a width direction, and a length direction perpendicular to each other. The fin body 231 has an inflow end 231A and an outflow end 231B along the flue gas inlet direction, where the inflow end 231A and the outflow end 231B are arranged in sequence along the width direction. The fin body 231 is provided with a plurality of tube pass-through holes 2313 that penetrate the fin body along the thickness direction, where the plurality of tube pass-through holes 2313 are provided for the primary heat exchange tube bundle 21 to pass through. That is, one first primary heat exchange tube 211 may be threaded through one of the tube pass-through holes 2313 to ensure positional stability of the first primary heat exchange tube 211 and the fin body 231. It should be noted that when the first primary heat exchange tubes 211 are elliptical tubes, the tube pass-through holes 2313 are elliptical holes. This not only ensures a stable positional relationship between each heat exchange tube and the fin body 231, preventing them from shaking or mismatching during operation, but also greatly improves heat transfer efficiency, such that the heat can be more efficiently transferred to a surrounding medium through the fin body 231. As can be understood, a plurality of heat exchange fins 23 are provided, and the plurality of heat exchange fins 23 are arranged in sequence along an axial direction of the first primary heat exchange tube 211 to further prolong residence time for the flue gas.

[0086] The turbulator 232 is connected to a surface of a side of the fin body 231 along the thickness direction, and the guide structure 233 is connected to the fin body 231 and positioned on the same surface of the fin body 231 as the turbulator 232. The turbulator 232 and the guide structure 233 may be integrated with the fin body 231 to ensure structural strength of the turbulator 232 and the guide structure 233, which ensures that the turbulator 232 and the guide structure 233 can still maintain good shapes and functions under complex operating conditions.

[0087] According to the technical solutions of this embodiment, the guide structure 233 is positioned on a side of the turbulator 232 near the inflow end 231A, the guide structure 233 guides the flue gas to the turbulator 232, and the turbulator 232 obstructs part of the flue gas flowing towards the outflow end 231B. The heat exchange fin 23 of this embodiment at least has the following technical effects.

[0088] Through the above layout, the guide structure 233 can accurately guide a large amount of flue gas to the turbulator 232. Subsequently, based on its obstructing effects, the turbulator 232 effectively slows down the trend of the flue gas directly flowing towards the outflow end 231B, forces the flue gas to generate more complex turbulence and mixing around the fin body 231. During this process, the contact area between the flue gas and the fin body 231 is significantly expanded, and contact time is also prolonged, thereby providing more ample opportunities for the heat exchange. The heat freely shuttles between the flue gas and the fin body 231, achieving efficient and uniform heat transfer, and greatly improving the heat exchange efficiency. Therefore, the heat exchange fin 23 of this embodiment promotes sufficient heat exchange of the flue gas, thereby greatly improving the heat transfer efficiency during the heat exchange process.

[0089] Referring to FIG. 7, in some structural forms, the guide structure 233 is an arched structure, and a flow guide channel 233A extending along the flue gas inlet direction is formed inside the arched structure, where the turbulator 232 is positioned at an outlet of the flow guide channel 233A. By designing the guide structure 233 as the arched structure, compared with the traditional scheme of providing a guide plate, the shape of the flow guide channel 233A naturally formed inside the arched structure is highly compatible with a flow direction of the flue gas, which can effectively guide the flue gas to flow along a predetermined path, and reduce resistance and turbulence of the flue gas during its flow process, thus improving the heat exchange efficiency. In contrast, although the traditional guide plate can also guide the flue gas, its shape is relatively simple and it is difficult to fully adapt to complex flow characteristics of the flue gas, resulting in lower heat exchange efficiency.

[0090] In addition, the arched structure is provided with the turbulator 232 at the outlet of the flow guide channel 233A to ensure that the flue gas flows out of the outlet of the flow guide channel 233A and then directionally flows to the turbulator 232. Through the action of the turbulator 232, part of the flue gas generates strong turbulence and mixing effects around the fin body 231, which greatly increases the contact area and the contact time between the flue gas and the fin body 231, and promotes the heat transfer process. This design not only improves the heat exchange efficiency, but also makes the heat exchange process more uniform and stable.

[0091] Further, the flow guide channel 233A has a cross section that gradually tapers from the inflow end 231A to the outflow end 231B. As the cross section gradually tapers, the flue gas may gradually accelerate during the flow process, forming a "jet-like" effect that helps to enhance the heat exchange between the flue gas and the fin body 231. Meanwhile, the gradually tapering cross section also promotes uniform distribution of the flue gas in the flow guide channel 233A, and reduces eddies and dead zones caused by uneven flow velocity, thereby improving the heat exchange efficiency. In addition, this design also helps to reduce energy loss of the flue gas during the flow process, allowing more energy to be effectively utilized in the heat exchange process.

[0092] Alternatively, a surface of the fin body 231 facing away from the guide structure 233 is provided with a first flue gas passage 2311 communicating with the flow guide channel 233A. In this way, the flue gas on the surface of the fin body 231 facing away from the guide structure 233 may also flow into the flow guide channel 233A through the first flue gas passage 2311, such that more flue gas flows towards the turbulator 232. This design not only increases the contact area between the flue gas and the fin body 231, but also prolongs the residence time of the flue gas staying around the fin body 231, thus providing more ample opportunities for the heat transfer. Meanwhile, as more flue gas is directed to the turbulator 232, the obstruction and mixing effects of the turbulator 232 on the flue gas can be more fully utilized, which further promotes the heat exchange between the flue gas and the fin body 231.

[0093] Referring to FIGS. 6 to 8, in some embodiments, the turbulator 232 includes a turbulator ring 2321 and a turbulator plate 2322 arranged in sequence along the flue gas inlet direction, an angle being formed between a length extension direction of the turbulator plate 2322 and the flue gas inlet direction. After the flue gas flows towards the turbulator ring 2321, the flue gas may flow along a circumference wall of the turbulator ring 2321, to effectively obstruct and guide the incoming flue gas for the first time, thereby prolonging the residence time of the flue gas. Based on its characteristic where the angle is formed between its length extension direction and the flue gas inlet direction, the turbulator plate 2322, which follows closely behind, can more fully utilize flow energy of the flue gas and guide the flue gas to generate more complex and intense turbulence and mixing around the fin body 231. This complex flow state not only increases the contact area and the contact time between the flue gas and the fin body 231, but also promotes uniformity and efficiency of the heat transfer. Therefore, by means of the combination of the turbulator ring 2321 and the turbulator plate 2322 in the turbulator 232 and the angle provided between the turbulator plate 2322 and the flue gas inlet direction, an efficient and stable heat exchange system is constituted.

[0094] Further, when viewed along the flue gas inlet direction, a projection plane of the turbulator ring 2321 is positioned within the turbulator plate 2322. This layout helps to reduce the energy loss of the flue gas during the flow process. The turbulator ring 2321 tightly fits with the turbulator plate 2322, such that the flue gas can maintain higher flow velocity and lower resistance when passing through this region, thereby reducing energy dissipation caused by uneven flow velocity or vortex generation.

[0095] Referring to FIGS. 6 to 8, alternatively, the surface of the fin body 231 facing away from the guide structure 233 is provided with a second flue gas passage 2312 communicating with an inner ring of the turbulator ring 2321. This allows the flue gas that could otherwise have directly swept over a back of the fin body 231 to be redirected and smoothly flow into an inner ring region of the turbulator ring 2321 through the second flue gas passage 2312. This layout is essentially a careful planning of the flow path of the flue gas, and it not only broadens an interface of contact between the flue gas and the fin body 231, but also significantly prolongs the residence time of the flue gas staying around the fin body 231. During this process, the heat exchange between the flue gas and the fin body 231 is more fully carried out, and efficiency and effect of the heat transfer are significantly improved. Therefore, additional arrangement of the second flue gas passage 2312 not only enhances heat exchange performance of the fin structure, but also makes the entire heat exchange process more efficient and stable.

[0096] Referring to FIG. 6, in some embodiments, the heat exchange fin 23 further includes collars 234. Each of the collars 234 is connected to the surface of the side of the fin body 231 along the thickness direction and is arranged around a circumference of each tube pass-through hole 2313. The collars 234 may be integrated with the fin body 231 to ensure the structural strength of the collars 234. By providing the collars 234, the contact area between the first primary heat exchange tube 211 and the fin body 231 can be directly and effectively increased. As the contact area significantly increases, the heat transfer between the first primary heat exchange tube 211 and the fin body 231 becomes more efficient and direct. During the heat exchange process, more heat can be quickly and fully exchanged between the first primary heat exchange tube 211 and the fin body 231, thereby significantly improving the overall heat exchange efficiency. This design not only optimizes the performance of the heat exchange fin 23, but also enables the entire heat exchange system to achieve the desired heat exchange effects in a shorter time, thereby meeting users' demands for efficient and energy-saving hot water supply.

[0097] Referring to FIGS. 6 to 8, alternatively, a plurality of turbulators 232 and a plurality of guide structures 233 are provided, where one guide structure 233 is correspondingly positioned on a side of one turbulator 232 near the inflow end 231A. This not only enhances flow field organization inside the heat exchange fin 23, but also significantly improves guidance and orderliness of the flue gas flow. As the flue gas flows in, each guide structure 233 can play its guiding role, such that the flue gas is smoothly guided to the corresponding turbulator 232, thereby effectively avoiding turbulence and energy loss during the flow process of the flue gas. Meanwhile, the presence of the plurality of turbulators 232 further intensifies the disturbance and mixing of the flue gas around the fin body 231, making the heat transfer process more adequate and efficient. This design not only increases the contact area between the flue gas and the fin body 231, but also promotes rapid heat exchange between the flue gas and the fin, thereby improving the overall heat exchange efficiency.

[0098] The same or similar reference numbers in the accompanying drawings of this embodiment correspond to the same or similar components. In the description of the present disclosure, it should be understood that if there are terms such as "up", "down", "left", "right" indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, it is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the language used to describe the positional relationships in the accompanying drawings is only for illustrative purposes and cannot be understood as a limitation of this patent. For those ordinarily skilled in the art, the specific meanings of the terms may be understood according to specific situations.

[0099] The embodiments set forth above are only illustrated as some embodiments of the present disclosure, and are not intended to limit the present disclosure. All modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure shall fall within the scope of the present disclosure.