Condensing heat exchanger for a wall-hung boiler

Abstract

The application provides a condensing type wall-hanging stove heat exchanger, which comprises a shell mechanism and a heat exchange mechanism, the heat exchange mechanism is located inside the shell mechanism, a transition smoke cavity which is communicated with the heat exchange mechanism is arranged in the shell mechanism, the heat exchange mechanism comprises a plurality of flat tubes and a water inlet and outlet adapter, wherein the flat tubes are arranged in a stack from top to bottom to form a flat tube barrel, the two ends of each flat tube are flush with and correspond to the two ends of the adjacent flat tube to form two ends of the flat tube barrel, the two ends of the flat tube barrel pass through the shell mechanism from inside to outside and extend to the outside, a water inlet cavity is arranged at the lower end of one side of the inside of the water inlet and outlet adapter, a water outlet cavity is arranged at the upper end, and a mixing cavity is arranged at the other side, the water inlet and outlet adapter is connected with the two ends of the flat tube barrel, the water inlet cavity and the water outlet cavity are respectively and hermetically communicated with the upper and lower parts of one end of the flat tube barrel, and the mixing cavity is hermetically communicated with the other end of the flat tube barrel. The device has a simple structure, can improve the heat exchange efficiency, reduce the water resistance, and effectively avoid the formation of condensate water in the equipment.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and more particularly to a condensing wall-hung boiler heat exchanger. Background Technology

[0002] Most mainstream wall-hung boiler heat exchangers on the market use a spiral coil as the main heat exchanger, such as the existing technology CN108917181A. In this technology, a spiral coil is set inside the heat exchanger, with one end of the spiral coil being the water inlet and the other end being the water outlet, thereby completing the heat exchange with the burner inside the heat exchanger to achieve the purpose of heat transfer. However, in this type of heat exchanger, the burner is located at the center of the spiral coil, and the spiral coil is located in the cavity of the heat exchanger shell. This results in the heat generated by the burner filling the entire shell cavity to complete the heat exchange with the liquid inside the spiral coil. The large cavity will inevitably cause heat loss and is not conducive to heat exchange.

[0003] Meanwhile, in order to improve the heat exchange efficiency of spiral coils, those skilled in the art have designed spiral coils with circular cross-sections into flat elliptical tubes. Although the flat elliptical tube spiral coil has a larger heat exchange area for the same cross-sectional area, the friction resistance of the heating water inside the tube is also greater. Therefore, in order to balance water resistance and heat exchange performance, the cross-sectional width of conventional spiral coils is usually designed to be larger, but this makes the overall volume of the heat exchanger larger. Furthermore, the water temperature in conventional spiral coils is linearly distributed, with the highest temperature at the outlet and the lowest temperature closer to the inlet. Excessive temperature difference between different ports of the spiral coil further causes uneven heat exchange. When this uneven heat exchange develops to a certain extent, the condensate generation area will expand, extending from the condensation zone to the non-condensation zone. This not only damages the burner inside the cavity and corrodes the coil, but also reduces the heat exchange capacity.

[0004] Domestic and foreign manufacturers typically use multiple coils to increase the heat exchange area. For example, patent CN111207608A of Guangdong Wanhe Thermal Energy Technology Co., Ltd. discloses a fully premixed high-efficiency condensing heat exchanger. Its heat exchange body includes a double spiral coil, wherein the second spiral heat exchange tube is provided with a water inlet interface, and the other end of the second spiral heat exchange tube is provided with a second transfer interface; the first spiral heat exchange tube is provided with a spiral heat exchange tube inside the tube and fins outside the tube. One end of the first spiral heat exchange tube is provided with a first transfer interface, and the other end of the first spiral heat exchange tube is provided with a water outlet interface. A connecting water box is connected between the first transfer interface and the second transfer interface. This scheme uses two spiral coils in series, resulting in high water resistance along the flow path.

[0005] For example, AO Smith's patent US20210333013A1 discloses a heat exchanger with inner and outer spiral heat exchange coils and multiple fins fixedly mounted on the tube body. Part of the outer edge of the fins has a flow-guiding structure, and the flow-guiding flue is located between the flow-guiding structure and the outer wall of the tube body. The heat exchange tube forms a flow-guiding flue through the flow-guiding structure on the fins, which guides the flue gas to the surface of the heat exchange tube body, thus preventing the flue gas from diffusing outward between the fins and improving the heat exchange efficiency of the heat exchange tube. However, this structure uses two layers of coils for heat exchange twice, resulting in high water resistance along the flow path, and the addition of fins to increase the heat exchange area leads to high cost.

[0006] Therefore, this invention designs a condensing wall-hung boiler heat exchanger that not only separates the high and low temperature zones within the heat exchange cavity to avoid the influence of condensate, but also improves tube thermal efficiency and reduces water resistance by changing the heat exchange tubes. Summary of the Invention

[0007] In view of this, in order to solve the problems of condensate water and low heat exchange efficiency, embodiments of the present invention provide a condensing wall-hung boiler heat exchanger.

[0008] An embodiment of the present invention provides a condensing wall-hung boiler heat exchanger, including a shell and a shell mechanism, which includes an outer shell and an inner shell, wherein the inner shell is housed within the outer shell and a transition flue is formed between the two, the outer shell has a flue gas outlet communicating with the transition flue, the transition flue communicates with the interior of the inner shell, and the upper end of the outer shell is sealed with an end cap, and the end cap has a burner extending to the center of the interior of the inner shell;

[0009] The heat exchange mechanism located inside the inner shell includes several flat tubes and inlet / outlet water adapters. The flat tubes are stacked sequentially from top to bottom to form a flat tube cylinder. The two ends of each flat tube are flush with and correspond to the two ends of the adjacent flat tubes to form the two ends of the flat tube cylinder. The two ends of the flat tube cylinder pass through the inner shell and the outer shell sequentially from the inside to the outside and extend to the outside. The inlet / outlet water adapter has an inlet chamber at the lower end of one side, an outlet chamber at the upper end, and a mixing chamber on the other side. The inlet / outlet water adapter is connected to the two ends of the flat tube cylinder. The inlet chamber and the outlet chamber are respectively sealed and connected to the upper and lower parts of one end of the flat tube cylinder, and the mixing chamber is sealed and connected to the other end of the flat tube cylinder.

[0010] Furthermore, an adapter plate is provided between the inlet / outlet water adapter and the two ends of the flat tube. The shape of the adapter plate is adapted to the shape of the two ends of the flat tube. The inlet / outlet water adapter is sealed and fixedly connected to the two ends of the flat tube through the adapter plate. The adapter plate has a first hole at the lower end of one side, a second hole at the upper end, and a third hole on the other side. The water inlet chamber and the water outlet chamber are respectively connected to the corresponding ends of the flat tube through the first hole and the second hole. The mixing chamber is connected to the corresponding end of the flat tube through the third hole.

[0011] Furthermore, the water inlet / outlet adapter is provided with a water inlet interface and a water outlet interface, the water inlet interface being connected to the water inlet chamber and the water outlet interface being connected to the water outlet chamber.

[0012] Furthermore, the axis of the flat tube coincides with the axis of the inner shell, and the burner is located at the center inside the flat tube, with a premixing chamber connected to the upper end of the burner.

[0013] Furthermore, the inner cylinder shell includes a cylinder body and a support plate, both of which are open at the top and bottom. The flat tube is located inside the cylinder body, the support plate is located below the cylinder body, and the lower end of the cylinder body is fixedly connected to the inner wall of the support plate. The outer wall of the support plate is fixedly connected to the inner side wall of the outer cylinder shell, and the transition smoke chamber is formed between the two. The transition smoke chamber communicates with the interior of the cylinder body.

[0014] Furthermore, the pallet is L-shaped and includes an integrally formed base plate and side plate. The lower end face of the base plate is fixedly connected to the upper end face of the bottom surface of the outer shell, and the upper end face is fixedly connected to the lower end of the cylinder. The outer wall of the side plate is fixedly connected to the inner wall of the outer shell. The upper end face of the bottom surface of the outer shell is provided with a first groove, and the inner wall of the side plate is provided with a second groove. The first groove and the second groove are interconnected, and the second groove is connected to the exhaust port. The base plate and the side plate respectively cover the first groove and the second groove to form the transition smoke chamber. The base plate is provided with a first connecting opening, and the first groove is connected to the inside of the cylinder through the first connecting opening.

[0015] Furthermore, a partition is provided inside the flat tube, the partition is fixedly connected to the inner wall of the flat tube, and the burner is located above the partition.

[0016] Furthermore, a gap is left between any two adjacent flat tubes.

[0017] Furthermore, the cylinder body is provided with a second connecting port, and the outer wall of the outer cylinder shell is provided with a condensate outlet, which corresponds to the second connecting port.

[0018] Furthermore, the cylinder body is provided with at least one retaining bracket, the flat tube is fixedly clamped to the retaining bracket, and the upper end of the retaining bracket is fixedly connected to the end cap and the lower end is fixedly connected to the bottom plate.

[0019] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: The condensing wall-hung boiler heat exchanger of the present invention increases the flow area and reduces the flow velocity by replacing the traditional spiral coil with a flat tube formed by multiple stacked annular flat tubes, thereby reducing friction resistance and improving heat exchange efficiency. Furthermore, the water inlet end of the flat tube mixes and redistributes the fluid in the parallel tubes, thereby increasing heat exchange uniformity and improving heat exchange efficiency. Combined with the baffles installed inside the flat tube, the two parts of the flat tube with large temperature differences are separated, thereby minimizing the generation of condensate in the high-temperature section and reducing the potential damage caused by condensate. At the same time, since the flat tube is formed by multiple stacked flat tubes in parallel, the heat exchange area can be maximized within the same volume, thereby improving heat exchange performance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a condensing wall-hung boiler heat exchanger according to the present invention;

[0021] Figure 2 yes Figure 1 Internal structure diagram;

[0022] Figure 3 yes Figure 1 Schematic diagram of the inner and outer shell structure;

[0023] Figure 4 yes Figure 2 Schematic diagram of the inner cylindrical shell structure;

[0024] Figure 5 yes Figure 4 Schematic diagram of the middle support plate structure;

[0025] Figure 6 yes Figure 2 Schematic diagram showing the positional relationship of the heat exchange mechanism within the inner shell;

[0026] Figure 7 yes Figure 6 Schematic diagram of the heat exchange mechanism;

[0027] Figure 8 yes Figure 1 Schematic diagram of the inlet / outlet water adapter;

[0028] Figure 9 yes Figure 8 Another perspective structural diagram of the inlet / outlet water adapter.

[0029] In the diagram: 1-Shell mechanism, 2-Heat exchange mechanism, 3-Outer shell, 4-Smoke outlet, 5-Condensate outlet, 6-End cap, 7-Burner, 8-Premixing chamber, 9-First groove, 10-Second groove, 11-Inner shell, 12-Cylinder body, 13-Support plate, 14-Second connecting port, 15-Bottom plate, 16-Side plate, 17-Transition smoke chamber, 18-Flat tube, 19-Flat tube, 20-Clamping bracket, 21-Inlet / outlet water adapter, 22-Inlet water chamber, 23-Outlet water chamber, 24-Mixing chamber, 25-Inlet water interface, 26-Outlet water interface, 27-Adapter plate, 28-First hole, 29-Second hole, 30-Third hole, 31-First connecting port, 32-Baffle plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0031] Please refer to Figure 1 and Figure 2 An embodiment of the present invention provides a condensing wall-hung boiler heat exchanger, which includes a shell structure 1 and a heat exchange mechanism 2 disposed inside the shell structure 1.

[0032] The shell mechanism 1 includes an outer shell 3 and an inner shell 11, wherein the inner shell 11 is housed inside the outer shell 3 and the center lines of the two coincide with each other. The heat exchange mechanism 2 is housed inside the inner shell 11 to facilitate heat exchange.

[0033] Please refer to Figure 3 The outer shell 3 has a cylindrical structure with an open top and a bottom surface at the bottom. Its outer wall surface has a smoke exhaust port 4 and a condensate outlet 5 that communicate with the interior, and the smoke exhaust port 4 and the condensate outlet 5 are located on different sides of the outer wall surface of the outer shell 3. The upper end surface of the bottom surface of the outer shell 3 has a first groove 9 and the inner side wall has a second groove 10. The first groove 9 and the second groove 10 are connected to each other and form an L-shaped cavity. At the same time, the second groove 10 is connected to the smoke exhaust port 4. It should be noted that the outer shell 3 in this embodiment can be integrally formed or assembled from two half shells.

[0034] Please refer to Figure 4 and Figure 5 The inner shell 11 includes a cylinder 12 and a support plate 13. Both ends of the cylinder 12 are open, and the cylinder 12 is located above the support plate 13. The lower end of the cylinder 12 is fixedly connected to the support plate 13, and the support plate 13 is fixedly connected to the inner wall of the outer shell 3. In this way, the inner shell 11 can be fixedly connected to the outer shell 3 as a whole, and the heat exchange structure 2 is housed inside the cylinder 12. It should be noted that the outer wall of the cylinder 12 does not contact the inner side wall of the outer shell 3, but is only fixedly connected to the outer shell 3 through the support plate 13.

[0035] The support plate 13 is L-shaped and includes a base plate 15 and a side plate 16. The base plate 15 is circular and the side plate 16 is triangular. The lower end of the side plate 16 is integrally formed and fixedly connected to the edge of the base plate 15. The center of the base plate 15 is provided with a first connecting port 31. The lower end face of the base plate 15 is fixedly connected to the upper end face of the bottom surface of the outer shell 3 and the base plate 15 covers the first groove 9. The outer side face of the side plate 16 is fixedly connected to the inner side wall of the outer shell 3 and the side plate 16 covers the second groove 10. In this way, the first groove 9 and the second groove 10 are completely covered to form a transition smoke chamber 17 between the two. The transition smoke chamber 17 is connected to the exhaust port 4. Since the base plate 15 is provided with the first connecting port 31, the transition smoke chamber 17 can be connected to the interior of the inner shell 11. Then, the exhaust gas that may be generated inside the inner shell 11 can be discharged through the exhaust port 4.

[0036] The wall of the cylinder 1 is provided with a second connecting port 14, which corresponds to the condensate outlet 5. In this way, water vapor that may be generated inside the inner cylinder shell 11 can be discharged through the condensate outlet 5. It should be noted that since the outer wall of the cylinder 12 does not contact the inner side wall of the outer cylinder shell 3, there is a gap between the outer wall of the cylinder 12 and the inner side wall of the outer cylinder shell 3. These gaps are not directly connected to the transition flue 17. The condensate outlet 5 is connected to the second connecting port 14 through these gaps, and then connected to the interior of the inner cylinder shell 11.

[0037] Please refer to Figures 1 to 3 The upper end of the outer shell 3 is provided with an end cap 6, and the lower end face of the end cap 6 is sealed and fixedly connected to the upper end of the outer shell 3, so that the interior of the outer shell 3 can form a relatively sealed chamber. The end cap 6 is provided with a burner 7, which extends through the end cap 6 to the center of the interior of the cylinder 12. The burner 7 is used to produce flue gas containing heat, and the part of the burner 7 located in the cylinder 12 is the flue gas discharge end, so that the flue gas containing heat can be discharged into the interior of the cylinder 12, thereby allowing the flue gas containing heat to exchange energy with the heat exchange structure 2. At the same time, the upper end face of the end cap 6 is provided with a premixing chamber 8, which is connected to the interior of the burner 7, and is used to introduce the substance to be burned into the premixing chamber 8.

[0038] The heat exchange mechanism 2 includes a flat tube 18, which is housed inside the cylinder 12. The lower end of the flat tube 18 is fixedly connected to the upper end face of the base plate 15, and the upper end is fixedly connected to the lower end face of the end cap 6. At least one retaining bracket 20 is provided inside the cylinder 12. Each retaining bracket 20 is used to further fix the flat tube 18. In this embodiment, there are two retaining brackets 20, which are symmetrically arranged inside the cylinder 12. Each retaining bracket 20 is U-shaped. The flat tube 18 is attached to the inside of the two retaining brackets 20. The open end of each retaining bracket 20 faces upward and is fixedly connected to the end cap 6, while the other end is fixedly connected to the upper end face of the base plate 15.

[0039] The flat tube 18 is composed of several annular flat tubes 19 stacked sequentially from top to bottom. Each flat tube 19 has two ports and one channel. The two ports of each flat tube 19 forming the flat tube 18 are flush with and correspond to the two ports of the adjacent flat tubes 19 to form the two ports of the flat tube 18. It should be noted that there is a gap between any two adjacent flat tubes 19. Since the size of the gap directly affects the heat exchange efficiency of the flat tube 18, the gap can be controlled by a flat tube comb. Since the two ports of the flat tube 18 are assembled from the ports of several flat tubes 19, each port of the flat tube 18 is connected to the channel of multiple flat tubes 19.

[0040] The two ends of the flat tube 18 pass through the inner shell 11 and the outer shell 3 from the inside to the outside and extend to the outside. A transition plate 27 is provided at the two ends of the flat tube 18. One side of the transition plate 27 is sealed and fixedly connected to the two ends of the flat tube 18, and the other side is away from the flat tube 18. The lower end of one side of the transition plate 27 is provided with a first hole 28, the upper end with a second hole 29, and the other side with a third hole 30. The first hole 28, the second hole 29, and the third hole 30 are not connected to each other, and the first hole 28 and the second hole 29 are sealed and connected to one end of the flat tube 18. In this way, one end of the flat tube 18 can be divided into two parts. The third hole 30 is sealed and connected to the other end of the flat tube 18. In this way, the two ends of the flat tube 18 are divided into three parts.

[0041] The heat exchange mechanism 2 also includes an inlet / outlet water adapter 21. The inlet / outlet water adapter 21 is sealed and fixedly connected to both ends of the flat tube 18 via an adapter plate 27. The inlet / outlet water adapter 21 has an inlet chamber 22 at its lower end and an outlet chamber 23 at its upper end on one side, and a mixing chamber 24 on the other side. The inlet chamber 22, outlet chamber 23, and mixing chamber 24 are not interconnected. When the heat exchange mechanism 2 is sealed and connected to the adapter plate 27, the inlet chamber 22 communicates with the first hole 28, and thus with the lower part of the corresponding end of the flat tube 18. The outlet chamber 23 communicates with... The second hole 29 is connected to the upper part of the corresponding port of the flat tube 18. The mixing chamber 24 is connected to the third hole 30, and then to the other corresponding port of the flat tube 18. The water inlet and outlet adapter 21 is also provided with a water inlet 25 and a water outlet 26. The water inlet 25 is connected to the water inlet chamber 22, and the water outlet 26 is connected to the water outlet chamber 23. In this way, the water entering from the water inlet 25 can flow into the interior of the flat tube 18 through the water inlet chamber 22, then mix in the mixing chamber 24, and finally flow out through the water outlet chamber 23 and out from the water outlet 26.

[0042] The flat tube 18 is equipped with a partition 32, which divides the internal space of the flat tube 18 into upper and lower parts. The partition 32 is located at the contact interface between the water inlet chamber 22 and the water outlet chamber 23. In this way, the entire flat tube 18 can be divided into upper and lower parts according to the length of the water inlet chamber 22 and the water outlet chamber 23. The burner 7 is located above the partition 32.

[0043] In this embodiment, the number of flat tubes 19 assembled into a flat tube cylinder 18 is 16. Under the same power operation of the burner 7, the heat exchange efficiency of this type of flat tube cylinder 18 is 99.2%, while the heat exchange efficiency of the conventional coil under the same conditions is 96.9%. Therefore, the heat exchanger in this embodiment is more efficient.

[0044] The working method of the wall-hung boiler heat exchanger in this embodiment is as follows: First, the burner 7 generates flue gas containing heat, and the flue gas is dispersed from the burner 6 into the inner cavity of the flat tube 18. Due to the blocking effect of the baffle 32, the flue gas containing heat exchanges energy with the water in the upper part of the flat tube 18. Then, it enters the lower part of the flat tube 18 through the gap between each flat tube 19. With the loss of energy, exhaust gas is formed. Finally, the exhaust gas enters the transition flue chamber 17 from the first connecting port 31 and is finally discharged from the exhaust port 4.

[0045] It should be noted that, since the flat tube 18 is equipped with a baffle 32, and the low-temperature water first enters the lower part of the flat tube 18 from the inlet chamber 22, then mixes in the mixing chamber 24 before entering the upper part of the flat tube 18, and finally exits from the outlet chamber 23, the water entering the flat tube 18 is preheated in the lower part before entering the upper part. This avoids the formation of condensate in the upper part of the flat tube 18, which could damage the burner 7. At the same time, since there are more flat tubes 19 above the baffle 32 than below, the water flow rate in the upper part of the flat tube 18 is slower than that in the lower part, which allows for better heat exchange.

[0046] A condensing wall-hung boiler heat exchanger also includes another embodiment, which differs from the first embodiment in that both the upper and lower ends of the flat tube 18 are provided with heat insulation pads. The lower end of the flat tube 18 is fixedly connected to the upper end face of the base plate 15 through the heat insulation pad, and the upper end is sealed and pressed against the lower end face of the end cover 6 through the heat insulation pad.

[0047] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0048] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A condensing wall-hung boiler heat exchanger, characterized in that, include: The shell mechanism (1) has a transition flue chamber (17) inside its wall and a flue port (4) communicating with the transition flue chamber (17) on its outer wall. The upper end of the shell mechanism (1) is sealed with an end cap (6) and the two form a sealed chamber. The end cap (6) is provided with a burner (7) extending to the center of the interior of the shell mechanism (1). And a heat exchange mechanism (2) located inside the shell mechanism (1), which includes several flat tubes (19) and water inlet / outlet adapters (21), wherein each of the flat tubes (19) is stacked from top to bottom to form a flat tube cylinder (18), and the two ends of each flat tube (19) are flush with and correspond to the two ends of the adjacent flat tube (19) to form the two ends of the flat tube cylinder (18). The two ends of the flat tube cylinder (18) pass through the shell mechanism (1) and extend to the outside. The water inlet / outlet adapter (21) has a water inlet chamber (22) at the lower end of one side and a water outlet chamber (23) at the upper end, and a mixing chamber (24) at the other side. The water inlet / outlet adapter (21) is connected to the two ends of the flat tube cylinder (18), and the water inlet chamber (22) and the water outlet chamber (23) are respectively sealed and connected to the upper and lower parts of one end of the flat tube cylinder (18), and the mixing chamber (24) is sealed and connected to the other end of the flat tube cylinder (18). The flat tube (18) is provided with a partition (32) inside. The partition (32) is fixedly connected to the inner wall of the flat tube (18). The burner (7) is located above the partition (32). The flat tube (19) above the partition (32) is longer than the one below.

2. The condensing wall-hung boiler heat exchanger as described in claim 1, characterized in that: The shell mechanism (1) includes an outer shell (3) and an inner shell (11), wherein the inner shell (11) is housed in the outer shell (3) and a transition flue (17) is formed between them, the exhaust port (4) is disposed on the outer wall of the outer shell (3), the transition flue (17) is in communication with the interior of the inner shell (11), the upper end of the outer shell (3) is sealed with the end cap (6), and the burner (7) is located at the center inside the inner shell.

3. A condensing wall-hung boiler heat exchanger as described in claim 2, characterized in that: The two ends of the flat tube (18) pass through the inner shell (11) and the outer shell (3) from the inside to the outside and extend to the outside. A transition plate (27) is provided between the water inlet / outlet adapter (21) and the two ends of the flat tube (18). The water inlet / outlet adapter (21) is sealed and fixedly connected to the two ends of the flat tube (18) through the transition plate (27). The transition plate (27) has a first hole (28) at the lower end of one side, a second hole (29) at the upper end, and a third hole (30) on the other side. The water inlet chamber (22) and the water outlet chamber (23) are respectively connected to the corresponding ends of the flat tube (18) through the first hole (28) and the second hole (29). The mixing chamber (24) is connected to the corresponding end of the flat tube (18) through the third hole (30).

4. A condensing wall-hung boiler heat exchanger as described in claim 3, characterized in that: The water inlet / outlet adapter (21) is provided with a water inlet interface (25) and a water outlet interface (26). The water inlet interface (25) is connected to the water inlet chamber (22), and the water outlet interface (26) is connected to the water outlet chamber (23).

5. A condensing wall-hung boiler heat exchanger as described in claim 2, characterized in that: The axis of the flat tube (18) coincides with the axis of the inner shell (11), and the burner (7) is located at the center inside the flat tube (18). The upper end of the burner (7) is connected to a premixed cavity (8).

6. A condensing wall-hung boiler heat exchanger as described in claim 2, characterized in that: The inner shell (11) includes a cylinder (12) with open top and bottom ends and a support plate (13). The flat tube (18) is located inside the cylinder (12), the support plate (13) is located below the cylinder (12), and the lower end of the cylinder (12) is fixedly connected to the inner wall of the support plate (13). The outer wall of the support plate (13) is fixedly connected to the inner wall of the outer shell (3), and the transition smoke chamber (17) is formed between the two. The transition smoke chamber (17) communicates with the interior of the cylinder (12).

7. A condensing wall-hung boiler heat exchanger as described in claim 6, characterized in that: The tray (13) is L-shaped and includes an integrally formed base plate (15) and side plate (16). The lower end face of the base plate (15) is fixedly connected to the upper end face of the bottom surface of the outer shell (3) and the upper end face is fixedly connected to the lower end of the cylinder (12). The outer wall of the side plate (16) is fixedly connected to the inner wall of the outer shell (3). The upper end face of the bottom surface of the outer shell (3) is provided with a first groove (9) and the inner wall of the side is provided with a second groove (10). The first groove (9) and the second groove (10) are interconnected, and the second groove (10) is connected to the exhaust port (4). The base plate (15) and the side plate (16) respectively cover the first groove (9) and the second groove (10) to form the transition smoke chamber (17). The base plate (15) is provided with a first connecting port (31). The first groove (9) is connected to the inside of the cylinder (12) through the first connecting port (31).

8. A condensing wall-hung boiler heat exchanger as described in claim 1, characterized in that: A gap is left between any two adjacent flat tubes (19).

9. A condensing wall-hung boiler heat exchanger as described in claim 6, characterized in that: The cylinder (12) is provided with a second connecting port (14), and the outer wall of the outer cylinder shell (3) is provided with a condensate outlet (5), which corresponds to the second connecting port (14).

10. A condensing wall-hung boiler heat exchanger as described in claim 7, characterized in that: The cylinder (12) is provided with at least one clamping frame (20) inside. The flat tube (18) is fixedly clamped on each of the clamping frames (20), and the upper end of each clamping frame (20) is fixedly connected to the end cap (6) and the lower end is fixedly connected to the bottom plate (15).

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