Condensing heat exchanger and gas water heater

Abstract

The application belongs to the field of hot water supply equipment, and particularly discloses a condensing heat exchanger and a gas water heater. The condensing heat exchanger comprises a shell with a heat exchange cavity, a heat exchange pipe assembly and a spoiler assembly arranged in the heat exchange cavity; the shell is provided with an inlet and an outlet; the heat exchange pipe assembly comprises a plurality of heat exchange sub-pipes which are connected to form a serpentine pipe line in the heat exchange cavity; the length of the heat exchange pipe assembly is relatively long and can fully occupy the heat exchange cavity; the spoiler assembly comprises a plurality of spoiler partitions which are arranged between two connected heat exchange sub-pipes; flue gas flows along the spoiler partitions to the space between the two connected heat exchange sub-pipes; the spoiler partitions are provided with a plurality of flow holes for the flue gas to pass through; the flue gas can also pass through the flow holes on the spoiler partitions, so that the flue gas is more evenly distributed between the two connected heat exchange sub-pipes, the contact area and heat exchange time of the flue gas and the heat exchange sub-pipes are effectively increased, and the heat exchange is sufficient and the heat exchange efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of hot water supply equipment, and more particularly to a condensing heat exchanger and a gas water heater. Background Technology

[0002] A condensing gas water heater adds a secondary heat exchange device, namely a condensing heat exchanger, at the high-temperature flue gas outlet of a conventional water heater. When the high-temperature flue gas flows through the condensing heat exchanger, the latent heat in the high-temperature flue gas is used to preheat the cold water flowing through the condensing heat exchanger, thereby making full use of the heat generated during gas combustion.

[0003] A condensing heat exchanger generally consists of a shell and heat exchange tubes. The inner cavity of the shell is the heat exchange chamber, and the heat exchange tubes are placed inside the inner cavity. The shell is equipped with a flue gas inlet and a flue gas outlet. High-temperature flue gas enters the shell through the flue gas inlet, exchanges heat with the cold water in the heat exchange tubes to cool down, and then the low-temperature flue gas exits the shell through the flue gas outlet.

[0004] However, in existing condensing heat exchangers, the flue gas is not evenly distributed within the shell, resulting in low heat exchange efficiency. Summary of the Invention

[0005] One of the technical problems solved by this invention is to provide a condensing heat exchanger that can effectively solve the problem of uneven distribution of flue gas in the existing shell and low heat exchange efficiency.

[0006] The second technical problem solved by this invention is to provide a gas water heater that can effectively solve the problem of uneven distribution of flue gas inside the existing casing and low heat exchange efficiency.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A condensing heat exchanger, comprising:

[0009] A shell having a heat exchange chamber, wherein the shell is provided with a flue gas inlet and a flue gas outlet;

[0010] A heat exchange tube assembly is disposed within the heat exchange cavity. The heat exchange tube assembly includes multiple heat exchange branch pipes, which are sequentially connected to a meandering serpentine pipeline formed within the heat exchange cavity.

[0011] A baffle assembly is disposed within the heat exchange chamber. The baffle assembly includes multiple baffles, which are inserted between two connected heat exchange branch pipes. The baffles are provided with a number of flow equalization holes for flue gas to pass through.

[0012] The condensing heat exchanger of the present invention has the following advantages compared with the prior art:

[0013] Multiple heat exchange tubes are connected sequentially to form a meandering serpentine pipeline, maximizing the overall length of the heat exchange tube assembly and ensuring it fully occupies the heat exchange chamber. High-temperature flue gas enters the heat exchange chamber through the inlet. The baffle assembly guides the flow direction of the flue gas. Specifically, multiple baffles are inserted between two connected heat exchange tubes, allowing the flue gas to flow along the baffles to the space between the two connected heat exchange tubes. Simultaneously, the flue gas can also pass through the flow equalization holes on the baffles, thus distributing the flue gas more evenly in the space between the two connected heat exchange tubes. This effectively increases the contact area and heat exchange time between the flue gas and the heat exchange tubes, resulting in high heat exchange efficiency.

[0014] In one embodiment, the heat exchange branch pipe is a U-shaped pipe, and any two connected heat exchange branch pipes are connected by a connecting pipe. A baffle plate is provided between any two connected heat exchange branch pipes. Thus, the U-shaped heat exchange pipe, a common type of heat exchange pipe, provides a sufficiently long flow path for the cold water, thereby extending the heat exchange time between the cold water and the flue gas. The baffle plate between any two connected heat exchange branch pipes ensures that the flue gas is evenly distributed throughout the heat exchange pipe assembly under the guidance of the baffle plate, improving heat exchange efficiency.

[0015] In one embodiment, any two connected heat exchanger pipes are configured to be arranged side-by-side, parallel to each other, or at an angle to each other. By arranging any two connected heat exchanger pipes side-by-side, parallel, or at an angle, the heat exchanger tube assembly can be rationally arranged within the heat exchange chamber. The state of the two connected heat exchanger pipes at various points within the heat exchange chamber is set according to the shape and size of the heat exchange chamber, maximizing the length of the heat exchanger tube assembly and making its routing more rational.

[0016] In one embodiment, the smoke inlet is located on the upper part of the side wall of the housing, and the smoke outlet is located on the top of the housing away from the smoke inlet;

[0017] One of the multiple baffles is a main baffle, and the other baffles are secondary baffles;

[0018] The main baffle plate faces the flue gas inlet and is positioned between the flue gas inlet and the flue gas outlet. The secondary baffle plate is cross-connected to the main baffle plate and divides the heat exchange cavity into multiple heat exchange zones, each of which is equipped with at least one heat exchange branch pipe. Thus, after the high-temperature flue gas enters the heat exchange cavity through the flue gas inlet on the side wall of the shell, it flows to different heat exchange zones under the guidance of the baffle plates and finally exits through the flue gas outlet. By dividing the heat exchange cavity through the main and secondary baffle plates, the flue gas is guided and distributed more evenly within the heat exchange cavity, extending the flow path of the flue gas within the heat exchange cavity, increasing the contact area between the flue gas and the heat exchange tube assembly, and prolonging the heat exchange time, thereby improving heat exchange efficiency without increasing the shell volume.

[0019] In one embodiment, a gap exists between the lower end of the spoiler assembly and the bottom of the housing, forming a flue gas guide channel;

[0020] A portion of the flue gas flows through the flow equalization holes on the main baffle plate from the side of the main baffle plate facing the flue gas inlet to the side of the main baffle plate facing the flue gas outlet; another portion of the flue gas flows through the flue gas guide channel from the side of the main baffle plate facing the flue gas inlet to the side of the main baffle plate facing the flue gas outlet. The flue gas outlet is located at the end of the top wall away from the flue gas inlet. In this way, the flow path of the flue gas within the shell is lengthened, increasing the heat exchange time between the flue gas and the cold water in the heat exchange tube assembly. Simultaneously, more flue gas can flow through the bottom of the shell, resulting in a smaller flue gas volume and temperature gradient difference between the upper and lower parts of the heat exchange chamber, leading to more uniform heat exchange.

[0021] In one embodiment, the housing includes:

[0022] bottom wall;

[0023] The first and second sidewalls are spaced apart;

[0024] The third sidewall connects one end of the first sidewall and one end of the second sidewall;

[0025] The fourth sidewall connects the other end of the first sidewall and the other end of the second sidewall;

[0026] The first sidewall includes a first wall, a second wall, and a third wall. The first wall is horizontally oriented, the second wall is vertically oriented, and the lower end of the second wall is connected to one end of the first wall. The third wall is vertically oriented, with its upper end connected to the other end of the first wall and its lower end connected to the bottom wall. The second sidewall includes a fourth wall and a fifth wall, with the fifth wall connected to the bottom end of the fourth wall. Both the third and fifth walls slope inward from top to bottom, creating a contraction space in the lower part of the housing. The smoke inlet is located on the fourth wall, and the smoke outlet is located at the end of the top wall away from the smoke inlet. Thus, after the high-temperature flue gas enters the first cavity through the smoke inlet, a portion of the flue gas flows downward and, guided by the fifth wall, flows to the flue gas guide channel formed by the bottom wall of the housing and the bottom of the baffle assembly. Then, guided by the third wall, the flue gas flows upward into the second cavity. By setting both the fifth and third walls to slope inward from top to bottom, a contraction space is formed in the lower part of the heat exchange chamber, thereby guiding and gathering the flue gas into the lower space of the shell. This guides the flue gas in the first chamber into the second chamber through the flue gas guide channel. At the same time, it helps to increase the flue gas resistance, prolong the flow path of the flue gas and the heat exchange time between the flue gas and the heat exchange tube assembly, and improve the heat exchange efficiency.

[0027] In one embodiment, the plurality of the baffles are a single, integrated structure. This results in high overall structural strength, long service life, and ease of manufacturing.

[0028] In one embodiment, the inner wall of the housing is provided with a mounting groove, and the side of the spoiler baffle is inserted into the mounting groove. Thus, the mounting groove serves to position and install the spoiler assembly, preventing it from shaking under the impact of flue gas.

[0029] In one embodiment, the baffle is made of a catalytic material used to control CO and NO in the flue gas. X Catalysis occurs. Thus, as the flue gas flows along the turbulence baffles or through the flow equalization orifices, the CO and NO in the flue gas... X Under the action of a catalyst, an oxidation-reduction reaction occurs, generating harmless N2 and CO2 gases. This effectively reduces the content of acidic substances in the condensate, thereby mitigating the corrosion of the casing by the condensate and making the flue gas emitted from the gas water heater more environmentally friendly.

[0030] The second technical problem mentioned above is solved by the following technical solution:

[0031] A gas-fired water heater includes a condensing heat exchanger as described above.

[0032] The gas water heater of the present invention has the following advantages compared with the prior art:

[0033] This gas water heater uses the aforementioned condensing heat exchanger. Multiple heat exchange pipes are connected sequentially to form a meandering serpentine pipeline. The overall length of the heat exchange pipe assembly is maximized, occupying as much of the heat exchange chamber as possible. Multiple baffles are inserted between two connected heat exchange pipes, allowing the flue gas to flow along the baffles to the space between the two connected heat exchange pipes. Simultaneously, the flue gas can also pass through the flow equalization holes on the baffles, thus distributing the flue gas more evenly in the space between the two connected heat exchange pipes. This effectively increases the contact area and heat exchange time between the flue gas and the heat exchange pipes, resulting in high heat exchange efficiency. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of a condensing heat exchanger provided in an embodiment of the present invention;

[0035] Figure 2 An exploded view of a condensing heat exchanger provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the spoiler assembly provided in an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of the baffle assembly and heat exchange tube assembly provided in the embodiments of the present invention inside the housing (the direction of flue gas flow is indicated by the dashed line with arrows);

[0038] Figure 5 for Figure 4 Cross-sectional view at point AA (the direction of flue gas flow is indicated by a dashed line with an arrow);

[0039] Figure 6 This is a schematic diagram of the structure of the housing provided in an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of the internal structure of the housing provided in an embodiment of the present invention (the direction of flue gas flow is indicated by dashed lines with arrows);

[0041] Figure 8 for Figure 7 Sectional view at point BB;

[0042] Figure 9 This is a schematic diagram of the structure of the heat exchange tube assembly provided in an embodiment of the present invention;

[0043] Figure 10 This is a schematic diagram of the structure of the top wall and the stop plate provided in an embodiment of the present invention;

[0044] Figure 11 This is a schematic diagram of the structure of the smoke collection hood assembly provided in an embodiment of the present invention;

[0045] Figure 12 This is an exploded view of the smoke collection hood assembly provided in an embodiment of the present invention.

[0046] Figure label:

[0047] 100. Condensate;

[0048] 1. Shell; 2. Heat exchanger tube assembly; 3. Baffle assembly; 4. Smoke hood assembly; 5. Sealing ring; 6. Fixed flange; 7. Stop plate;

[0049] 11. Bottom wall; 12. First side wall; 13. Second side wall; 14. Third side wall; 15. Fourth side wall; 16. Top wall; 17. Inlet chimney; 18. Heat exchange zone;

[0050] 111. Condensate drain outlet;

[0051] 121. First wall; 1211. Through hole; 122. Second wall; 1221. Slot; 123. Third wall; 1231. Flow guide groove; 1232. Reinforcing rib;

[0052] 131. The fourth wall; 132. The fifth wall;

[0053] 141. Mounting slot;

[0054] 161. Smoke outlet; 162. Mounting hole;

[0055] 171. Smoke inlet;

[0056] 21. Heat exchange branch pipe; 22. Inlet water connector; 23. Outlet water connector; 24. Connecting pipe;

[0057] 31. Main baffle plate; 32. Secondary baffle plate; 33. Flow equalization orifice;

[0058] 311. First protrusion; 312. Second protrusion;

[0059] 41. Cover plate; 42. Chimney;

[0060] 411. Chimney hole; 412. Clip protrusion. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., 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, they should not be construed as limitations on this application.

[0063] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0065] like Figures 1-5 , Figure 9 As shown, this embodiment provides a condensing heat exchanger, including a shell 1, a heat exchange tube assembly 2, and a baffle assembly 3. The shell 1 has a heat exchange cavity. The shell 1 is provided with a flue gas inlet 171 and a flue gas outlet 161 communicating with the heat exchange cavity. The heat exchange tube assembly 2 is disposed inside the heat exchange cavity. The heat exchange tube assembly 2 includes multiple heat exchange branch pipes 21, which are sequentially connected to a meandering serpentine pipeline formed inside the heat exchange cavity. The baffle assembly 3 is disposed inside the heat exchange cavity. The baffle assembly 3 includes multiple baffles, which are inserted between two connected heat exchange branch pipes 21, and the baffles are provided with a number of flow equalization holes 33 for flue gas to pass through.

[0066] The heat exchange tube assembly 2 has an inlet connector 22 and an outlet connector 23. Cold water enters the heat exchange tube assembly 2 through the inlet connector 22 and flows through the sequentially connected heat exchange branch pipes 21 to the outlet connector 23. Simultaneously, high-temperature flue gas enters the heat exchange chamber through the flue gas inlet 171 and exchanges heat with the cold water in the heat exchange tube assembly 2, heating the cold water and causing the outlet water temperature to be higher than the inlet water temperature. The cooled flue gas is then discharged from the shell 1 through the flue gas outlet 161. Multiple heat exchange branch pipes 21 are connected sequentially to form a meandering serpentine pipeline, resulting in a relatively long overall length of the heat exchange tube assembly 2, which fully occupies the heat exchange chamber. This provides a large contact area between the heat exchange tube assembly 2 and the flue gas, ensuring thorough heat exchange and high efficiency.

[0067] The bottom wall 11 of the shell 1 is provided with a condensate drain outlet 111. When some flue gas exchanges heat with the cold water of the heat exchange tube assembly 2, some of the flue gas will condense into condensate 100. The condensate 100 drips to the bottom of the shell 1 and is discharged from the condensate drain outlet 111.

[0068] After the high-temperature flue gas enters the heat exchange chamber, the baffle assembly 3 guides the flow direction of the flue gas, making the flue gas as evenly distributed as possible in the shell 1, increasing the contact area and contact time between the flue gas and the heat exchange tube assembly 2, thereby improving the heat exchange efficiency. Specifically, multiple baffles of the baffle assembly 3 are respectively inserted between two connected heat exchange branch pipes 21, so that the flue gas flows along the baffles to the space between the two connected heat exchange branch pipes 21. At the same time, the flue gas can also pass through the flow equalization holes 33 on the baffles, making the flue gas more evenly distributed in the space between the two connected heat exchange branch pipes 21, effectively increasing the contact area and heat exchange time between the flue gas and the heat exchange branch pipes 21, thereby improving the heat exchange efficiency.

[0069] For example, the flow equalization holes 33 can be polygonal shapes such as triangles, quadrilaterals, rhombuses, and hexagons, or closed curve shapes such as circles or ellipses; no limitation is made here. The size of the flow equalization holes 33 should not be too large, so that the flue gas can pass slowly through the flow equalization holes 33 to achieve the effect of equalizing the flow of the flue gas. Preferably, a plurality of flow equalization holes 33 are evenly distributed on the turbulence baffle.

[0070] In this embodiment, the heat exchange branch pipe 21 is a U-shaped pipe. Any two connected heat exchange branch pipes 21 are connected by a connecting pipe 24, and a baffle plate is provided between any two connected heat exchange branch pipes 21. The U-shaped heat exchange pipe is a common type of heat exchange pipe, allowing the cold water a sufficiently long flow path and extending the heat exchange time between the cold water and the flue gas. Preferably, the heat exchange pipe assembly 2 is made of stainless steel corrugated pipe, which ensures its corrosion resistance and facilitates the bending and shaping of the heat exchange branch pipes 21. Exemplarily, the connecting pipe 24 is an arc-shaped pipe, enabling the water to switch direction from one heat exchange branch pipe 21 to another. The openings of the U-shaped pipes all face downwards, and the two ends of the arc-shaped pipe are respectively connected to the bottoms of two connected U-shaped pipes. A baffle plate is provided between any two connected heat exchange branch pipes 21, allowing the flue gas to be evenly distributed throughout the entire heat exchange pipe assembly 2 under the guidance of the baffle plate, improving heat exchange efficiency. In this embodiment, the baffle plate is located above the arc-shaped pipe.

[0071] Optionally, any two connected heat exchanger pipes 21 can be configured to be side-by-side, parallel to each other, or at an angle to each other. By arranging any two connected heat exchanger pipes 21 side-by-side, parallel, or at an angle, the heat exchanger tube assembly 2 can be rationally arranged within the heat exchange cavity. The state of the two connected heat exchanger pipes 21 at various points within the heat exchange cavity is set according to the shape and size of the heat exchange cavity, so that the length of the heat exchanger tube assembly 2 is as long as possible and the orientation of the heat exchanger tube assembly 2 is more reasonable. In this embodiment, the two U-shaped tubes arranged side-by-side are coplanar, the planes of the two parallel U-shaped tubes are parallel, and the planes of the two U-shaped tubes arranged at an angle are at an angle. For example, the angle between the two heat exchanger pipes 21 arranged at an angle is 90°, that is, the two heat exchanger pipes 21 are perpendicular. Of course, in other embodiments, the angle between the two connected heat exchanger pipes 21 can also be set according to the shape and size of the heat exchange cavity, and this is not limited.

[0072] Optionally, the smoke inlet 171 is located on the upper part of the side wall of the shell 1, and the smoke outlet 161 is located on the top of the shell 1 away from the smoke inlet 171. One of the multiple baffles is a main baffle 31, and the others are secondary baffles 32. The main baffle 31 faces the smoke inlet 171 and is located between the smoke inlet 171 and the smoke outlet 161. The secondary baffles 32 are arranged intersectingly with the main baffle 31, dividing the heat exchange cavity into multiple heat exchange regions 18. Each heat exchange region 18 has at least one heat exchange branch pipe 21. The main baffle 31 roughly divides the heat exchange cavity into two chambers, which are referred to as the first chamber and the second chamber for ease of description. The first chamber is located on the side of the main baffle 31 facing the smoke inlet 171, and the second chamber is located on the side of the main baffle 31 facing the smoke outlet 161. The secondary turbulence baffle 32 is arranged intersectingly with the main turbulence baffle 31, thereby dividing the first cavity and the second cavity, and ultimately dividing the heat exchange cavity into multiple heat exchange regions 18. At least one heat exchange branch pipe 21 is provided in each heat exchange region 18, so that the heat exchange tube assembly 2 is distributed in various parts of the heat exchange cavity.

[0073] High-temperature flue gas enters the heat exchange chamber through the inlet 171 on the side wall of the shell 1. Under the guidance of the various baffles, it flows to different heat exchange areas 18 and is finally discharged through the outlet 161. Specifically, the high-temperature flue gas entering the heat exchange chamber through the inlet 171 is first evenly distributed in the first chamber under the guidance and diversion effect of the secondary baffle 32 and the flow equalization holes 33 on it. In the first chamber, part of the flue gas passes directly through the flow equalization holes 33 on the main baffle 31 and enters the second chamber, while the other part flows along the extension plane of the main baffle 31 and then bypasses the main baffle 31 to enter the second chamber. In the second chamber, the flue gas is evenly distributed in the second chamber under the action of the secondary baffle 32 and the flow equalization holes 33 on it, and is finally discharged through the outlet 161.

[0074] By setting the main turbulence baffle 31 and the secondary turbulence baffle 32, the heat exchange cavity is divided, the flue gas is diverted and distributed more evenly in the heat exchange cavity, the flow path of the flue gas in the heat exchange cavity is extended, the contact area between the flue gas and the heat exchange tube assembly 2 is increased, and the heat exchange time between the two is extended, thereby improving the heat exchange efficiency without increasing the volume of the shell 1.

[0075] In this embodiment, two secondary baffles 32 are provided, both of which are perpendicular to the main baffle 31. The first cavity is divided into three heat exchange regions 18 by the two secondary baffles 32, which are designated as the first heat exchange region, the second heat exchange region, and the third heat exchange region, respectively. Each of the first and second heat exchange regions has one heat exchange branch pipe 21, and the second heat exchange region has two heat exchange branch pipes 21. All three heat exchange branch pipes 21 in the three heat exchange regions 18 are arranged in parallel. The second cavity is also divided into three heat exchange regions 18 by the two secondary baffles 32, designated as the fourth, fifth, and sixth heat exchange regions, respectively. The fourth heat exchange region corresponds to the first heat exchange region, the fifth heat exchange region corresponds to the second heat exchange region, and the sixth heat exchange region corresponds to the third heat exchange region. Each of the fourth, fifth, and sixth heat exchange regions has one heat exchange branch pipe 21. The heat exchange branch pipe 21 in the fourth heat exchange region is connected side-by-side with the heat exchange branch pipe 21 in the first heat exchange region. The heat exchange branch pipe 21 in the fifth heat exchange region is vertically connected between the two heat exchange branch pipes 21 in the second heat exchange region. The heat exchange branch pipe 21 in the sixth heat exchange region is connected side-by-side with the heat exchange branch pipe 21 in the third heat exchange region. In other embodiments, the number of secondary turbulence baffles 32 and their intersection angle with the main turbulence baffle 31 can be adjusted to divide the heat exchange cavity into multiple heat exchange regions 18. The orientation and distribution of the heat exchange tube assembly 2 are set according to the layout of the multiple heat exchange regions 18, and no specific limitation is made.

[0076] Optionally, the aforementioned multiple baffles are an integrated structure with high overall structural strength, long service life, and easy processing.

[0077] Optionally, the baffle is made of a catalytic material for controlling CO and NO in the flue gas. X Catalysis occurs. When the flue gas flows along the turbulence baffle or through the flow equalization orifice 33, the CO and NO in the flue gas... X Under the action of a catalyst, a redox reaction occurs, producing harmless N2 and CO2 gases. The chemical equation for the redox reaction is: 2NO + 2CO = N2 + 2CO2. This effectively reduces the content of acidic substances (such as HNO3, the chemical equation for the formation of HNO3 is: 4NO + 2H2O + 3O2 = 4HNO3) in the condensate 100, thereby reducing the corrosion of the casing 1 by the condensate 100 and making the flue gas emitted from the gas water heater more environmentally friendly.

[0078] The catalytic material is produced by mixing and dissolving raw materials (mainly titanium dioxide, vanadium pentoxide, and manganese monoxide) in a required proportion to form a slurry, followed by filtration, extrusion, and molding. The slurry is then dried and calcined at a medium temperature, and finally partially cut or machined to produce the finished baffle plate. It should be noted that the composition and processing technology of the catalytic material are conventional techniques, and this technology is not the focus of this invention and will not be described in detail here.

[0079] Optionally, a gap exists between the lower end of the baffle assembly 3 and the bottom of the housing 1, forming a flue gas guide channel. The flue gas entering the first cavity through the inlet 171 flows partly through the equalization holes 33 on the main baffle 31 from the side of the main baffle 31 facing the inlet 171 to the side of the main baffle 31 facing the outlet 161; the other part flows through the flue gas guide channel from the side of the main baffle 31 facing the inlet 171 to the side of the main baffle 31 facing the outlet 161. In this way, the flow path of the flue gas within the housing 1 becomes longer, increasing the heat exchange time between the flue gas and the cold water in the heat exchange tube assembly 2. Simultaneously, more flue gas can flow through the bottom of the housing 1, resulting in a smaller flue gas volume and temperature gradient difference between the upper and lower parts of the heat exchange chamber, leading to more uniform heat exchange.

[0080] Optionally, see Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 and Figure 10 The shell 1 includes a surrounding plate and the aforementioned bottom wall 11, which together form the aforementioned heat exchange chamber. A condensate drain outlet 111 is provided on the bottom wall 11. The surrounding plate includes a first side wall 12, on which a step is formed, and the step surface is higher than the bottom wall 11. The step surface has two through holes 1211 for installing the inlet connector 22 and the outlet connector 23 of the heat exchange tube assembly 2, respectively. Thus, by setting the inlet connector 22 and the outlet connector 23 of the heat exchange tube assembly 2 on the step formed on the first side wall 12, both the inlet connector 22 and the outlet connector 23 are higher than the condensate drain outlet 111 on the bottom wall 11, thereby preventing the inlet connector 22 and the outlet connector 23 from being immersed in the condensate 100, which could lead to corrosion or even leakage.

[0081] Optionally, the enclosure also includes a second side wall 13, a third side wall 14, a fourth side wall 15, and a top wall 16. The second side wall 13 is spaced apart from the first side wall 12, and the aforementioned smoke inlet 171 is disposed on the second side wall 13. The third side wall 14 connects one end of the first side wall 12 and one end of the second side wall 13. The fourth side wall 15 connects the other end of the first side wall 12 and the other end of the second side wall 13. The aforementioned smoke outlet 161 is disposed at the end of the top wall 16 away from the smoke inlet 171. The smoke outlet 161 is perpendicular to the smoke inlet 171, specifically, the smoke inlet 171 is in a left-right direction, and the smoke outlet 161 is in a vertical direction.

[0082] Optionally, the first sidewall 12 includes a first wall 121, a second wall 122, and a third wall 123. The first wall 122 is arranged horizontally. The second wall 122 is arranged vertically, and its lower end is connected to one end of the first wall 121; the third wall 123 is arranged vertically, and its upper end is connected to the other end of the first wall 121 at an angle, and its lower end is connected to the bottom wall 11, thereby forming a stepped surface on the first wall 121. The two through holes 1211, which are used to install the inlet connector 22 and the outlet connector 23 of the heat exchange tube assembly 2, are respectively provided on the first wall 121.

[0083] Optionally, the second sidewall 13 includes a fourth wall 131 and a fifth wall 132, with the fifth wall 132 connected at an angle to the bottom end of the fourth wall 131. The aforementioned flue gas inlet 171 is disposed on the fourth wall 131. The fifth wall 132 slopes inward from top to bottom, and the third wall 123 also slopes inward from top to bottom, forming a contraction space in the lower part of the heat exchange chamber. After the high-temperature flue gas enters the first chamber through the flue gas inlet 171, a portion of the flue gas flows downward and, guided by the fifth wall 132, flows to the flue gas guide channel formed by the bottom wall 11 of the shell 1 and the bottom of the baffle assembly 3. Then, guided by the third wall 123, the flue gas flows upward into the second chamber. By setting the fifth wall 132 and the third wall 123 to be inclined inward from top to bottom, a contraction space is formed in the lower part of the heat exchange chamber, thereby guiding and gathering the flue gas into the lower space of the shell 1, guiding the flue gas in the first chamber into the second chamber through the flue gas guiding channel, and at the same time helping to increase the flue gas resistance, prolong the flow path of the flue gas and the heat exchange time between it and the heat exchange tube assembly 2, thereby improving the heat exchange efficiency.

[0084] Optionally, the angle between the plane containing the fifth wall 132 and the plane containing the third wall 123 is set to α, where α is between 20° and 40°. If the angle α is too large, the space at the bottom of the shell 1 will be too narrow, which may cause airflow vortices and dead zones, resulting in poor flue gas exhaust and reduced heat exchange efficiency. If the angle α is too small, the guiding effect on the flue gas will be reduced, and less flue gas will be guided to the heat exchange tube assembly 2, which is not conducive to improving heat exchange efficiency.

[0085] Optionally, see Figure 2 , Figures 6-8 A guide groove 1231 is recessed from the inside out on the third wall 123. The guide groove 1231 extends vertically and extends upward to the connection between the third wall 123 and the first wall 121. The guide groove 1231 serves as a guide channel for the upward flow of flue gas, allowing the flue gas at the bottom of the housing 1 (i.e., the flue gas guide channel) to flow more smoothly upward to the second cavity, reducing the occurrence of turbulence.

[0086] Optionally, the first wall 121 is parallel to the bottom wall 11, and the extension direction of the guide channel 1231 is perpendicular to the side where the third wall 123 connects to the first wall 121. The angle between the bottom wall of the guide channel 1231 and the first wall 121 is set to b, where b is 110°-130°. The size of the angle b affects the upward guiding effect of the guide channel 1231 on the flue gas at the bottom of the shell 1. If the angle b is set too large, the amount of flue gas gathered upward will be insufficient, and most of the flue gas will flow out along the inner wall surface of the shell 1, resulting in a reduction in the heat exchange between the flue gas and the heat exchange tube assembly 2, which is not conducive to enhancing heat exchange. If the angle b is set too small, the resistance to the upward flow of flue gas will increase, which may lead to airflow noise and poor flue gas exhaust.

[0087] Optionally, the bottom of the guide channel 1231 can extend downward to the connection between the third wall 123 and the bottom wall 11 to improve the effect of guiding the flue gas upward.

[0088] Optionally, the flow channel 1231 is formed by pressing on the inner side of the third wall 123. The flow channel 1231 is obtained by stamping reinforcing ribs 1232 on the third wall 123. The processing technology is simple and can also increase the strength of the shell 1 and reduce the deformation of the shell 1.

[0089] Optionally, multiple guide channels 1231 can be provided, and multiple guide channels 1231 are spaced apart on the third wall 123 to further improve the effect of guiding flue gas upward.

[0090] Optionally, see Figure 2 , Figure 3 and Figure 7 The inner wall of the housing 1 is provided with a mounting groove 141, and the side of the baffle is inserted into the mounting groove 141. The mounting groove 141 serves to position the baffle assembly 3 and prevent it from shaking under the impact of flue gas. Specifically, in this embodiment, the inner walls of the third side wall 14 and the fourth side wall 15 are both provided with mounting grooves 141, which extend vertically. The front and rear end faces of the main baffle 31 are each provided with a first protrusion 311, which is elongated and extends vertically. The first protrusion 311 slides downward into the mounting groove 141.

[0091] See Figure 2 A flue duct 17 is provided on the outer side of the fourth wall 131, and the opening of the flue duct 17 is the flue gas inlet 171. The flue duct 17 facilitates connection with the flue gas conveying components. A sealing ring 5 and a fixing flange 6 are provided at the opening of the flue duct 17. The fixing flange 6 is used to fix the sealing ring 5 to the opening of the flue duct 17, ensuring that high-temperature flue gas will not leak from the opening of the flue duct 17. Exemplarily, the flue duct 17 and the fourth wall 131 are an integral structure, ensuring the sealing at the connection point and further preventing flue gas leakage.

[0092] Optionally, see Figure 2 , Figure 3 and Figure 10 The top wall 16 is also provided with mounting holes 162, and the upper side of the main spoiler baffle 31 is inserted into the mounting holes 162. Further, the upper end of the main spoiler baffle 31 is provided with a second protrusion 312, which is inserted into the mounting holes 162. For example, the second protrusion 312 is elongated.

[0093] To facilitate assembly, the width of the second protrusion 312 is slightly smaller than the width of the mounting hole 162, and the width of the first protrusion 141 is also slightly smaller than the width of the mounting groove 141. However, this makes the installation of the spoiler assembly 3 less stable. Therefore, see [link to relevant documentation]. Figure 10 The condensing heat exchanger also includes a baffle plate 7, which is installed on the upper side of the top wall 16 and located on the side of the mounting hole 162 away from the flue gas outlet 161. The baffle plate 7 laterally presses against the second protrusion 312 extending out of the mounting hole 162, thereby fixing the baffle assembly 3 and preventing the baffle assembly 3 from shaking under the impact of flue gas. Exemplarily, the baffle plate 7 is snap-fitted onto the top wall 16.

[0094] Optionally, see Figure 1 , Figure 2 , Figure 4 , Figure 11 and Figure 12 The condensing heat exchanger also includes a smoke hood assembly 4, which is disposed on the shell 1 and communicates with the smoke outlet 161 for collecting and guiding the flue gas discharged from the smoke outlet 161. Specifically, in this embodiment, the smoke hood assembly 4 includes a cover plate 41 and a smoke outlet 42. The cover plate 41 is disposed at the upper end of the shell 1 and covers the smoke outlet 161. The cover plate 41 is provided with a smoke outlet hole 411, and the smoke outlet 42 is installed at the smoke outlet hole 411. The flue gas discharged from the smoke outlet 161 enters the smoke outlet 42 through the smoke outlet hole 411 and is finally discharged from the smoke outlet 42.

[0095] Optionally, a converging space is formed between the cover plate 41 and the housing 1. The upper part of this converging space is smaller than the lower part, thereby converging the smoke discharged from the smoke outlet 161, allowing the smoke to flow more smoothly to the smoke outlet 42, while reducing the impact of the smoke on the cover plate 41 and reducing airflow noise. Specifically, in this embodiment, the cover plate 41 is pressed into an upwardly convex shape to form a converging space on its inner side.

[0096] Optionally, see Figure 6 and Figure 12 The cover plate 41 has a locking protrusion 412 on its edge, and the upper port edge of the housing 1 has a locking groove 1221. The locking protrusion 412 engages with the locking groove 1221, thus facilitating the installation and positioning of the cover plate 41 on the housing 1 and making assembly easier. Afterwards, the cover plate 41 can be bolted to the housing 1 for a more secure connection. Obviously, the positions of the locking protrusion 412 and the locking groove 1221 can also be interchanged, with the locking protrusion 412 positioned on the edge of the upper port of the housing 1 and the locking groove 1221 formed on the edge of the cover plate 41.

[0097] This embodiment also provides a gas water heater, including the aforementioned condensing heat exchanger. This gas water heater has high thermal efficiency.

[0098] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0099] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A condensing heat exchanger, characterized by, include: A shell (1) with a heat exchange chamber, wherein a flue gas inlet (171) and a flue gas outlet (161) are provided on the shell (1). A heat exchange tube assembly (2) is disposed in the heat exchange cavity. The heat exchange tube assembly (2) includes multiple heat exchange branch pipes (21), which are sequentially connected to a meandering serpentine pipeline formed in the heat exchange cavity. A baffle assembly (3) is disposed in the heat exchange chamber. The baffle assembly (3) includes multiple baffles. The baffles are inserted between two connected heat exchange branch pipes (21). The baffles are provided with a number of flow equalization holes (33) for flue gas to pass through. The flow equalization holes (33) are evenly distributed on the baffles. The heat exchange branch pipe (21) is a U-shaped pipe. Any two heat exchange branch pipes (21) connected together are connected by a connecting pipe (24). The turbulence baffle is provided between any two heat exchange branch pipes (21). The smoke inlet (171) is located on the upper part of the side wall of the housing (1), and the smoke outlet (161) is located at the top of the housing (1) away from the smoke inlet (171); One of the multiple baffles is a main baffle (31), and the other baffles are secondary baffles (32). The main turbulence baffle (31) is directly opposite the smoke inlet (171) and is located between the smoke inlet (171) and the smoke outlet (161); the secondary turbulence baffle (32) is cross-connected with the main turbulence baffle (31) and divides the heat exchange cavity into multiple heat exchange areas (18), and each heat exchange area (18) is provided with at least one heat exchange branch pipe (21).

2. The condensing heat exchanger according to claim 1, wherein Any two connected heat exchange pipes (21) are configured to be arranged side by side, or to be arranged parallel to each other, or to be arranged at an angle to each other.

3. The condensing heat exchanger of claim 1, wherein The lower end of the spoiler assembly (3) has a gap with the bottom of the housing (1) and forms a flue gas guide channel; A portion of the flue gas flows through the equalization holes (33) on the main turbulence baffle (31) from the side of the main turbulence baffle (31) toward the smoke inlet (171) to the side of the main turbulence baffle (31) toward the smoke outlet (161); another portion of the flue gas flows through the flue gas guide channel from the side of the main turbulence baffle (31) toward the smoke inlet (171) to the side of the main turbulence baffle (31) toward the smoke outlet (161).

4. The condensing heat exchanger according to claim 3, wherein The housing (1) includes: Bottom wall (11) and top wall (16); The first sidewall (12) and the second sidewall (13) are spaced apart. The third sidewall (14) connects one end of the first sidewall (12) and one end of the second sidewall (13); The fourth sidewall (15) connects the other end of the first sidewall (12) and the other end of the second sidewall (13); The first sidewall (12) includes a first wall (121), a second wall (122), and a third wall (123). The first wall (121) is arranged horizontally, the second wall (122) is arranged vertically, and the lower end of the second wall (122) is connected to one end of the first wall (121). The third wall (123) is arranged vertically, the upper end of the third wall (123) is connected to the other end of the first wall (121), and the lower end of the third wall (123) is connected to the bottom wall (123). 1) The second sidewall (13) includes a fourth wall (131) and a fifth wall (132), the fifth wall (132) being connected to the bottom of the fourth wall (131); the third wall (123) and the fifth wall (132) are both inclined inward from top to bottom, so that the lower part of the shell (1) forms a contraction space, the smoke inlet (171) is provided on the fourth wall (131), and the smoke outlet (161) is provided at the end of the top wall (16) away from the smoke inlet (171).

5. The condensing heat exchanger according to any one of claims 1 to 4, wherein The multiple baffles are an integral structure.

6. The condensing heat exchanger according to any one of claims 1 to 4, wherein The inner wall of the housing (1) is provided with a mounting groove (141), and the side of the baffle is inserted into the mounting groove (141).

7. The condensing heat exchanger according to any one of claims 1 to 4, wherein The spoiler baffle is made of catalytic material for catalyzing CO and NO in the flue gas X .

8. A gas water heater, characterised by, Including the condensing heat exchanger as described in any one of claims 1-7.

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