A new heat exchanger

Abstract

The utility model discloses a novel heat exchanger, including casing, hot water outlet pipe, cold water inlet pipe, evaporation pipe and discharge pipe. The first heat exchange subassembly and second heat exchange subassembly are sequentially and interval provided in the casing, form integrated heat exchange structure to constitute the installation gap between both, and evaporation pipe is located in the gap, is used for heat absorption evaporation condensate and discharges gaseous water. The discharge pipe is arranged in the first heat exchange fin group, and the discharge pipe is located between the two first heat exchange pipes, one end communicates with the evaporation pipe, and the other end is connected with external condensate pipe line, and it absorbs the high temperature area heat in the heat exchange process, and the heat absorption evaporation of the convection condensate is carried out. Therefore, the discharge pipe is arranged between the two first heat exchange pipes, can absorb the high temperature area heat in the evaporation condensate process, avoids the fluid vaporization in the pipe, guarantees the heat exchange stability, and the evaporation pipe is arranged between the two heat exchange subassemblies, realizes the waste heat resorption when discharging gaseous condensate, thereby improves the overall energy utilization rate and system operation reliability.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, specifically to a novel heat exchanger. Background Technology

[0002] Heat exchangers are core components in heating equipment such as gas water heaters and condensing boilers. Their structural design directly determines heat exchange efficiency, overall size, and energy consumption. In existing technologies, heat exchangers typically consist of a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger is located on the flue gas inlet side to absorb the sensible heat of the high-temperature combustion gases; the secondary heat exchanger is located on the flue gas outlet side to recover the latent heat contained in the flue gas, thereby improving overall energy utilization.

[0003] However, in traditional designs, the primary and secondary heat exchangers are often arranged separately, meaning they are installed independently in different locations within the equipment and connected in series via long piping. While this structure enables two-stage heat recovery, it still has the following drawbacks: (1) The structure is scattered and the size is large, which leads to a complex layout of the whole machine and is not conducive to the miniaturization and integration design of the product; (2) The heat exchange temperature zones are significantly different. The fins of the main heat exchanger located on the high-temperature flue gas inlet side are at a higher temperature. When it is necessary to increase the heating end temperature to enhance heat exchange, the fluid in the internal heat exchange tube is prone to local vaporization, which affects the heat exchange stability. If the heating end temperature is reduced, the heat exchange efficiency will decrease, making it difficult to balance performance and stability. (3) The heat transfer path between the main heat exchange section and the secondary heat exchange section is too long, resulting in significant heat loss during the transfer process and reducing the overall thermal efficiency. (4) The installation and assembly process is complex, the number of pipelines is large, the connection and sealing requirements are high, and the manufacturing and maintenance costs are high; (5) As the cold water inlet section, the secondary heat exchange section is prone to condensation during the latent heat condensation of flue gas, which may not only reduce the heat exchange efficiency, but also lead to corrosion risk and long-term performance degradation.

[0004] Therefore, existing technologies urgently need a heat exchanger with a more compact structure and an integrated design of the main heat exchange components and secondary heat exchange components, so that it can improve heat exchange efficiency while taking into account structural stability and condensate treatment effect, so as to further improve the overall energy utilization rate and optimize the space adaptability of the equipment. Utility Model Content

[0005] To overcome the defects of the prior art, this utility model provides a novel heat exchanger. The discharge pipe is located between two first heat exchange tubes, which can absorb heat from the high-temperature area during the evaporation of condensate, avoid the vaporization of the fluid inside the tube, and ensure stable heat exchange. The evaporation tube is located between two heat exchange components, which can reabsorb residual heat when discharging gaseous condensate, thereby improving the overall energy utilization rate and system operation reliability.

[0006] The technical solution adopted by this utility model to solve its problem is: A novel heat exchanger includes: The shell has a first heat exchange component and a second heat exchange component arranged sequentially and at intervals to form an integrated heat exchange structure and an installation gap between them. The first heat exchange component is located on the high-temperature flue gas inlet side. The first heat exchange component includes a first heat exchange fin group and a first heat exchange tube passing through the first heat exchange fin group. The second heat exchange component is located on the high-temperature flue gas outlet side. The second heat exchange component includes a second heat exchange fin group and a second heat exchange tube passing through the second heat exchange fin group. One end of the second heat exchange tube is connected to one end of the first heat exchange tube through a connecting pipe, so that the fluid flows through the second heat exchange component and the first heat exchange component in sequence to achieve multi-stage heat exchange. A hot water outlet pipe is connected to the other end of the first heat exchange pipe and is used to input the liquid to be heated. A cold water inlet pipe is connected to the other end of the second heat exchange tube and is used to output the heated liquid. An evaporator tube is installed within the installation gap and is used to absorb heat and evaporate the condensate, and to discharge the resulting gaseous water. The first heat exchange fin assembly is also provided with a discharge pipe, which is located in the gap between the two first heat exchange tubes. One end of the discharge pipe is connected to the evaporation tube, and the other end is used to connect to the external condensate pipe to introduce condensate. During the heat exchange operation, the discharge pipe is used to absorb the heat of the high-temperature area between the two first heat exchange tubes to absorb heat and evaporate the condensate flowing inside.

[0007] Furthermore, the first heat exchange fin assembly includes a plurality of first heat exchange fins, and a plurality of first heat exchange tubes arranged at intervals are threaded through the first heat exchange fins. The plurality of first heat exchange tubes are connected in series in sequence through a first elbow.

[0008] Furthermore, the other end of the evaporator tube is a closed end; the bottom of the shell is also provided with an input pipe for connecting to an external pipeline to introduce condensate, and the input pipe is connected to the other end of the discharge pipe.

[0009] Furthermore, the discharge pipe includes multiple branch pipes passing through the first heat exchange fins, and adjacent branch pipes are connected in series via a second elbow. The branch pipe located at the water inlet end, which is not connected through the second elbow, is connected to the input pipe at one end, and the branch pipe located at the water outlet end, which is not connected through the second elbow, is connected to the evaporation pipe at the other end.

[0010] Furthermore, the bottom of the housing is provided with a collection tank for collecting condensate from the second heat exchange fin assembly. The bottom of the collection tank is connected to an output pipe, which is used to connect to an external pipeline to discharge the condensate outside the housing.

[0011] Furthermore, it also includes a collection tank and a water pump, wherein the inlet end of the collection tank is connected to the outlet pipe, the outlet end of the collection tank is connected to the input end of the water pump, and the output end of the water pump is connected to the input pipe.

[0012] Furthermore, the evaporator tube is provided with a plurality of vent holes spaced apart along its length, so that the condensate introduced through the discharge tube absorbs heat and vaporizes before being discharged to the outside through the vent holes.

[0013] Furthermore, the diameters of both the discharge pipe and the evaporation pipe are smaller than the diameters of the first heat exchange pipe and / or the second heat exchange pipe.

[0014] Furthermore, the second heat exchange fin assembly includes a second heat exchange fin and a third heat exchange fin, and the second heat exchange tube includes a first straight tube and a second straight tube; multiple first straight tubes are arranged at intervals and pass through the second heat exchange fins, and multiple second straight tubes are arranged at intervals and pass through the third heat exchange fins; the first straight tubes and the second straight tubes are connected in series in sequence through a third elbow. The first straight pipe located at the water inlet end, which is not connected through the third elbow, is connected to the cold water inlet pipe at one end, and the second straight pipe located at the water outlet end, which is not connected through the third elbow, is connected to one end of the first heat exchange pipe through the connecting pipe at one end.

[0015] Furthermore, the first heat exchange fins are provided in a plurality of portions and are arranged at intervals along the length direction of the first heat exchange tube; the second heat exchange fins are provided in a plurality of portions and are arranged at intervals along the length direction of the first straight tube; and the third heat exchange fins are provided in a plurality of portions and are arranged at intervals along the length direction of the second straight tube.

[0016] In summary, this utility model has the following technical effects: 1. This utility model of heat exchanger, through an integrated heat exchange structure, enables continuous heat exchange between the first and second heat exchange components within the same housing. This not only shortens the flow path of the hot fluid and reduces energy loss during heat transfer, but also significantly improves the overall heat exchange efficiency. Furthermore, because the discharge pipe is located in the gap between the two first heat exchange tubes, it can effectively absorb heat from the high-temperature region during the evaporation of condensate, thereby removing localized overheating and preventing vaporization of the fluid inside the first heat exchange tubes, ensuring the stability and safety of the heat exchange process. Simultaneously, the evaporation tube is arranged in the installation gap between the first and second heat exchange components. While discharging gaseous condensate, the first heat exchange components can absorb residual heat again, achieving full energy recovery and reuse, further improving the overall thermal energy utilization rate and operational reliability of the system.

[0017] 2. Compared with the existing separate arrangement of the main heat exchanger and secondary heat exchanger, the integrated design of this utility model not only makes the overall structure more compact and significantly reduces the size of the equipment, but also facilitates modular installation in wall-hung boilers, gas water heaters and other devices. At the same time, due to the significant reduction in the length of the connecting pipes between the heat exchange components, the return and discharge path of condensate is smoother, which can avoid the impact of condensate accumulation on heat exchange performance and material durability.

[0018] 3. In this utility model heat exchanger, the first heat exchange component and the second heat exchange component adopt a directly connected heat exchange tube structure, which allows the heating fluid to flow sequentially through the condensation zone and the high-temperature zone, further improving the heat energy recovery and utilization rate and reducing energy consumption. The overall structure not only optimizes the heat exchange path and improves the flow state of air and water, but also simplifies the manufacturing and assembly process, improves the reliability and maintenance convenience of the system, and achieves compact size, improved energy efficiency, simplified structure and extended service life. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the heat exchanger of this utility model from one perspective; Figure 2 This is a schematic diagram of the heat exchanger of this utility model from a second perspective; Figure 3 This is a schematic diagram of the internal structure of the heat exchanger of this utility model; Figure 4 This is a schematic diagram of the evaporator tube in the heat exchanger of this utility model; Figure 5 This is a schematic diagram of the shell structure in the heat exchanger of this utility model.

[0020] The meanings of the reference numerals in the attached figures are as follows: 1. Shell; 11. First opening; 12. Second opening; 13. Collection tank; 131. Output pipe; 14. Input pipe; 2. Second heat exchange fin; 21. First straight pipe; 22. Third elbow; 3. Third heat exchange fin; 31. Second straight pipe; 32. Connecting pipe; 33. Installation gap; 4. First heat exchange fin; 41. First heat exchange tube; 42. First elbow; 43. Discharge pipe; 44. Second elbow; 45. Evaporator tube; 451. Exhaust port; 452. Closed end; 5. Cold water inlet pipe; 51. Inlet connector; 52. Water flow sensor; 6. Hot water outlet pipe; 61. Outlet connector; 7. Collection tank; 8. Water pump. Detailed Implementation

[0021] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 utility model and simplifying the description, and do not indicate or imply that the module 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 utility model.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0024] like Figure 1-5 As shown, this utility model discloses a novel heat exchanger, including a shell 1, a hot water outlet pipe 6, a cold water inlet pipe 5, an evaporator pipe 45, and a discharge pipe 43. A first heat exchange component and a second heat exchange component are arranged sequentially and alternately inside the shell 1 to form an integrated heat exchange structure, with an installation gap 33 between them. This arrangement allows high-temperature flue gas to exchange heat fully with the first and second heat exchange components sequentially within the shell 1, significantly shortening the heat transfer path of the hot fluid, reducing intermediate heat loss, thereby improving overall heat exchange efficiency and making the equipment structure more compact.

[0025] The first heat exchange assembly is located on the high-temperature flue gas inlet side and includes a first heat exchange fin group and a first heat exchange tube 41 passing through the fin group. The second heat exchange assembly is located on the high-temperature flue gas outlet side and includes a second heat exchange fin group and a second heat exchange tube passing through the fin group. One end of the second heat exchange tube is connected to one end of the first heat exchange tube 41 through a connecting pipe 32, allowing the liquid to flow sequentially through the second heat exchange assembly and the first heat exchange assembly for multi-stage heat exchange, thereby achieving full recovery and utilization of sensible heat in the high-temperature zone and latent heat in the low-temperature zone, further improving the thermal energy utilization rate.

[0026] The hot water outlet pipe 6 is connected to the other end of the first heat exchange pipe 41 and is used to output the heated liquid; the cold water inlet pipe 5 is connected to the other end of the second heat exchange pipe and is used to input the liquid to be heated, forming a continuous heat exchange flow path to achieve efficient countercurrent heat exchange of hot and cold fluids.

[0027] Evaporation tube 45 is installed in the installation gap 33 between the first heat exchange component and the second heat exchange component, and is used to absorb heat and evaporate the introduced condensate and discharge the resulting gaseous water.

[0028] The first heat exchange fin assembly also includes a discharge pipe 43, located within the gap between the two first heat exchange tubes 41. One end of the discharge pipe 43 is connected to the evaporator tube 45, and the other end is connected to an external condensate pipe to guide condensate generated from the surface of the second heat exchange assembly. During heat exchange operation, the discharge pipe 43 absorbs heat from the high-temperature zone between the two first heat exchange tubes 41, evaporating the condensate flowing through it, thereby reducing the local temperature while simultaneously vaporizing and discharging the condensate.

[0029] It should be noted that during the operation of the heat exchanger, the second heat exchange component, serving as the cold water inlet section, is prone to condensation accumulation on the surface of its second heat exchange fin assembly when absorbing the latent heat of the flue gas. Meanwhile, the first heat exchange component, located on the high-temperature flue gas inlet side, has a higher temperature in its first heat exchange fin assembly. When the temperature at the high-temperature flue gas inlet side increases to enhance heat exchange, the fluid within the first heat exchange tube 41 may undergo localized vaporization, leading to fluctuations in heat exchange efficiency and unstable heat transfer. Therefore, this invention places a discharge pipe 43 in the gap between the two first heat exchange tubes 41, directing the condensate formed by the second heat exchange fin assembly into the discharge pipe 43. The condensate flows within the pipe and absorbs heat from the high-temperature region before being heated and evaporated, effectively removing localized overheating and preventing liquid vaporization within the first heat exchange tube 41, thus ensuring a stable and safe heat exchange process.

[0030] Furthermore, the evaporator tube 45 is arranged within the installation gap 33. During the discharge of gaseous condensate through it, the second heat exchange component, located on the high-temperature flue gas outlet side, can also absorb heat from the high-temperature steam a second time, thereby achieving full heat recovery and reuse. This design not only improves the overall thermal energy utilization rate and heat exchange reliability of the system, but also effectively prevents condensate retention, improving the long-term stability and corrosion resistance of the equipment.

[0031] Furthermore, the first heat exchange fin assembly includes several first heat exchange fins 4, and multiple first heat exchange tubes 41 arranged at intervals are threaded onto the first heat exchange fins 4. The multiple first heat exchange tubes 41 are connected in series via first bends 42. This structure not only increases the contact area with the flue gas, but also effectively extends the flow path of the heat exchange fluid through the arrangement of the first bends 42, making heat exchange more complete and thus improving thermal efficiency.

[0032] See Figure 3-4 The other end of the evaporator tube 45 is a closed end 452; the bottom of the shell 1 is also provided with an input pipe 14 for connecting to an external pipeline to introduce condensate, and the input pipe 14 is connected to the other end of the discharge pipe 43 to introduce condensate.

[0033] Furthermore, the discharge pipe 43 includes multiple branch pipes that pass through the first heat exchange fins 4, and adjacent branch pipes are connected in series through a second elbow 44. The branch pipe located at the water inlet end, which is not connected to the second elbow 44, is connected to the input pipe 14, and the branch pipe located at the water outlet end, which is not connected to the second elbow 44, is connected to the evaporation pipe 45. This multi-branch pipe arrangement allows the discharge pipe 43 to form a distributed heating path within the main heat exchange zone, thereby increasing the heating area and evaporation rate of the condensate.

[0034] Specifically, the evaporator tube 45 is provided with multiple vent holes 451 at intervals along its length, so that the condensate introduced through the discharge pipe 43 vaporizes after absorbing the waste heat of the main heat exchange zone and is discharged to the outside through the vent holes 451. This design utilizes the waste heat of the high-temperature gas in the main heat exchange zone to achieve the vaporization and evaporation of the condensate, which not only reduces the retention and accumulation of condensate, but also effectively avoids structural damage caused by corrosion from acidic condensate droplets.

[0035] In this embodiment, the diameters of the discharge pipe 43 and the evaporation pipe 45 are both smaller than the diameters of the first heat exchange pipe 41 and / or the second heat exchange pipe, so as to reduce the heat exchange impact caused by the condensate flow rate and ensure that the condensate has a high evaporation efficiency in the pipe. At the same time, it also ensures that the condensate flowing through the discharge pipe 43 can carry away the local overheating between the two first heat exchange pipes 41 and avoid the vaporization of the liquid in the first heat exchange pipe 41.

[0036] Furthermore, the discharge pipe 43 is located in the gap between the two first heat exchange tubes 41 to absorb the heat of the high-temperature zone between the two first heat exchange tubes 41 and evaporate the condensate flowing through it.

[0037] It should be noted that, since the gap between the two first heat exchange tubes 41 is a high-temperature concentrated area and the fin temperature at the gap is high, the waste heat can be fully utilized to evaporate the condensate by arranging the discharge pipe 43 in this area, so that the generated water vapor can be discharged to the outside through the exhaust port 451 of the evaporation tube.

[0038] During operation, the water vapor and combustion flue gas can be discharged together through the exhaust system, which improves energy efficiency and reduces the risk of condensate accumulation.

[0039] Furthermore, the bottom of the shell 1 is provided with a collection tank 13 for collecting condensate generated by the second heat exchange fin assembly. The collection tank 13 is provided with an output pipe 131, which is connected to an external pipeline to discharge the condensate out of the shell 1 in a timely manner, so as to avoid the condensate from stagnating and affecting the heat exchange effect and the corrosion resistance of the structure.

[0040] Furthermore, the heat exchanger of this invention also includes a collection tank 7 and a water pump 8. The inlet end of the collection tank 7 is connected to the outlet pipe 131 to collect the condensate discharged from the collection tank 13. The outlet end of the collection tank 7 is connected to the input end of the water pump 8, and the output end of the water pump 8 is connected to the input pipe 14. Through this structure, the water pump 8 can reintroduce the condensate accumulated in the collection tank 7 into the input pipe 14, so that the condensate flows into the first heat exchange fin assembly through the outlet pipe 43. After absorbing heat from the high-temperature area between the two first heat exchange tubes 41, it evaporates and is discharged as gaseous water through the evaporation pipe 45. This recycling design not only realizes the self-circulation evaporation and discharge of condensate, reducing the need for external water replenishment, but also further removes heat from the locally overheated area through evaporation heat absorption, improving the thermal stability and overall energy utilization efficiency of the system.

[0041] In other embodiments, a condensate collection device, such as a collection bucket, can be provided to collect the condensate and then pressurize and deliver it to the input pipe 14 via the output device of the water pump 8. When the condensate flows through the discharge pipe 43, it absorbs heat from the high-temperature zone between the two first heat exchange tubes 41, achieving heat absorption and evaporation, and the generated water vapor is discharged from the shell through the exhaust port 451 of the evaporation pipe 45.

[0042] In addition, the collection tank 13 allows the incompletely evaporated condensate to be collected and discharged smoothly, which not only keeps the inside of the heat exchanger dry and prevents condensate from stagnating and causing fin corrosion or increased thermal resistance, but also further extends the service life and operational stability of the equipment.

[0043] Furthermore, by integrating the first and second heat exchange components into the same housing 1 to form an integrated heat exchange structure, and setting a condensate collection tank 13 at the bottom of the second heat exchange component, while condensate evaporation pipes 45 are arranged in the first heat exchange component, the condensate can be circulated within the system. During operation, the high-temperature flue gas generated by the burner flows sequentially through the first and second heat exchange components, achieving efficient exchange of sensible and latent heat. The acidic condensate generated at the bottom of the second heat exchange component is collected by the condensate collection tank 13 and then quantitatively pumped by the water pump 8 to the evaporation pipes 45 located in the high-temperature flue gas zone or high-temperature heat exchange zone. The condensate rapidly absorbs heat and vaporizes under high-temperature conditions, and is discharged along with the flue gas through the exhaust channel. This structural design not only eliminates the need for external drain pipes in traditional condensing systems, avoiding problems such as drainage blockage or freezing in winter, but also utilizes waste heat from flue gas to achieve on-site evaporation of condensate, improving heat recovery efficiency and system energy efficiency, and reducing the direct discharge of acidic condensate. It has the advantages of energy saving, environmental protection, compact structure and high integration, and can significantly improve the overall operational stability and installation adaptability of water heaters or condensing boilers.

[0044] In this embodiment, the inlet end of the cold water inlet pipe 5 is equipped with an inlet connector 51 and a water flow sensor 52. The inlet connector 51 is used for detachable connection with an external water supply pipeline to enable cold water input and subsequent maintenance operations. The water flow sensor 52 is used to detect the water flow status entering the heat exchanger, thereby ensuring that the system operates under a stable flow rate. The end of the hot water outlet pipe 6 is equipped with an outlet connector 61 for connection with an external water supply pipeline to achieve efficient output of heated hot water. By providing connector structures at both the inlet and outlet ends, the heat exchanger is easy to install, disassemble, and maintain, significantly improving assembly convenience. At the same time, the connectors can be equipped with various sealing structures such as sealing rings, quick-connect fittings, or threaded interfaces according to the actual application environment to enhance the sealing reliability and system adaptability of the interface, further ensuring the safety and stability of long-term operation.

[0045] Furthermore, the second heat exchange fin assembly includes a second heat exchange fin 2 and a third heat exchange fin 3, and the second heat exchange tube includes a first straight tube 21 and a second straight tube 31; multiple first straight tubes 21 are arranged at intervals and pass through the second heat exchange fin 2, and multiple second straight tubes 31 are arranged at intervals and pass through the third heat exchange fin 3, and the first straight tubes 21 and the second straight tubes 31 are connected in series in sequence through a third elbow 22; Among them, the end of the first straight pipe 21 located at the water inlet end, which is not connected by the third elbow 22, is connected to the cold water inlet pipe 5, and the end of the second straight pipe 31 located at the water outlet end, which is not connected by the third elbow 22, is connected to one end of the first heat exchange pipe 41 through the connecting pipe 32. A first gap exists between the second heat exchange fin 2 and the third heat exchange fin 3, and an installation gap 33 exists between the second and third heat exchange fin groups. The evaporator tube 45 is installed within this installation gap 33, and the gaseous condensate discharged from its exhaust port 451 can be discharged sequentially through the installation gap 33 and the first gap. The aforementioned gap structure effectively reduces flue gas flow resistance and forms a guiding channel that facilitates condensate cooling and smooth discharge, thereby improving the system's heat exchange and drainage efficiency. Simultaneously, when the gaseous condensate flows between the second and third heat exchange fin groups, both can absorb its latent heat, achieving full recovery of the waste heat from the gaseous condensate and further improving the energy utilization rate and operational economy of the heat exchanger.

[0046] Furthermore, the first heat exchange fin 4 is provided with several and is arranged at intervals along the length direction of the first heat exchange tube 41; the second heat exchange fin 2 is provided with several and is arranged at intervals along the length direction of the first straight tube 21; and the third heat exchange fin 3 is provided with several and is arranged at intervals along the length direction of the second straight tube 31, thereby forming a uniform heat exchange field in different flow sections to ensure stable flue gas temperature drop and uniform heat exchange.

[0047] See Figure 5 The shell 1 is a through structure with a first opening 11 on one side and a second opening 12 on the other side, located at the high-temperature flue gas outlet. A first heat exchange component is positioned near the second opening 12 at the high-temperature flue gas inlet, and a second heat exchange component is positioned near the first opening 11 at the high-temperature flue gas outlet. During operation, the second opening 12 connects to the water heater burner, allowing the high-temperature flue gas generated by combustion to enter the shell 1 through the second opening 12, flow sequentially through the first and second heat exchange components, and then exit through the first opening 11. This structural arrangement ensures that the high-temperature flue gas completes a thorough exchange of sensible and latent heat within the shell 1 in a sequential manner, improving heat energy utilization and streamlining the airflow path within the shell 1, thereby enhancing overall heat exchange efficiency and reducing exhaust gas temperature.

[0048] It should be noted that the top and bottom of the shell 1 are provided with several reserved holes, which are used for the installation of the first heat exchange tube 41, the second heat exchange tube, the discharge pipe 43, the output pipe 131, and the input pipe 14. In the actual assembly process, the position and size of each reserved hole can be adjusted according to the pipeline layout and installation space, and a reliable sealing connection can be achieved by sealing rings or welding, thereby ensuring the sealing performance of the shell 1 and the stable fixation of the pipeline, preventing the leakage of flue gas or condensate, and improving the safety and durability of the overall structure.

[0049] In summary, this heat exchanger, through its integrated heat exchange structure, enables continuous heat exchange between the first and second heat exchange components within the same housing 1. This not only shortens the flow path of the hot fluid and reduces energy loss during heat transfer, but also significantly improves the overall heat exchange efficiency. Furthermore, because the discharge pipe 43 is positioned within the gap between the two first heat exchange tubes 41, it effectively absorbs heat from the high-temperature region during the evaporation of condensate, thereby removing localized overheating and preventing vaporization of the fluid inside the first heat exchange tubes 41, ensuring the stability and safety of the heat exchange process. Simultaneously, the evaporation tube, arranged within the installation gap between the first and second heat exchange components, allows the first heat exchange components to absorb residual heat again while discharging gaseous condensate, achieving full energy recovery and reuse, further enhancing the overall thermal efficiency and operational reliability of the system.

[0050] Compared to the existing separate main and secondary heat exchanger structures, the integrated design of this utility model not only makes the overall structure more compact and significantly reduces the size of the equipment, but also facilitates modular installation in devices such as wall-hung boilers and gas water heaters. At the same time, due to the significant reduction in the length of the connecting pipes between the heat exchange components, the return and drainage paths of condensate are smoother, which can avoid the impact of condensate accumulation on heat exchange performance and material durability.

[0051] This novel heat exchanger employs a directly connected heat exchange tube structure between the first and second heat exchange components. This allows the heating fluid to flow sequentially through the condensation zone and the high-temperature zone, further improving heat recovery and utilization efficiency and reducing energy consumption. The overall structure not only optimizes the heat exchange path and improves the flow state of air and water, but also simplifies manufacturing and assembly processes, enhancing system reliability and maintenance convenience. It achieves a compact size, improved energy efficiency, simplified structure, and extended service life.

[0052] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0053] It should be understood that the terms "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 utility model and simplifying the description, and do not indicate or imply that the module 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 utility model.

[0054] Furthermore, in the description of this utility model, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0055] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A novel heat exchanger, characterized in that, include: The shell has a first heat exchange component and a second heat exchange component arranged sequentially and at intervals to form an integrated heat exchange structure and an installation gap between them. The first heat exchange component is located on the high-temperature flue gas inlet side, and the first heat exchange component includes a first heat exchange fin group and a first heat exchange tube passing through the first heat exchange fin group. The second heat exchange component is located on the high-temperature flue gas outlet side. The second heat exchange component includes a second heat exchange fin group and a second heat exchange tube passing through the second heat exchange fin group. One end of the second heat exchange tube is connected to one end of the first heat exchange tube through a connecting pipe, so that the liquid flows through the second heat exchange component and the first heat exchange component in sequence to achieve multi-stage heat exchange. A hot water outlet pipe is connected to the other end of the first heat exchange pipe and is used to input the liquid to be heated. A cold water inlet pipe is connected to the other end of the second heat exchange tube and is used to output the heated liquid. An evaporator tube is installed within the installation gap and is used to absorb heat and evaporate the condensate, and to discharge the resulting gaseous water. The first heat exchange fin assembly is also provided with a discharge pipe, which is located in the gap between the two first heat exchange tubes. One end of the discharge pipe is connected to the evaporation tube, and the other end is used to connect to the external condensate pipe to introduce condensate. During the heat exchange operation, the discharge pipe is used to absorb the heat of the high-temperature area between the two first heat exchange tubes to absorb heat and evaporate the condensate flowing inside.

2. The novel heat exchanger according to claim 1, characterized in that, The first heat exchange fin assembly includes a plurality of first heat exchange fins, and multiple first heat exchange tubes arranged at intervals are threaded through the first heat exchange fins. The multiple first heat exchange tubes are connected in series in sequence through a first elbow.

3. The novel heat exchanger according to claim 2, characterized in that, The other end of the evaporator tube is a closed end; the bottom of the shell is also provided with an input pipe for connecting to an external pipeline to introduce condensate, and the input pipe is connected to the other end of the discharge pipe.

4. The novel heat exchanger according to claim 3, characterized in that, The discharge pipe includes multiple branch pipes that pass through the first heat exchange fins, and adjacent branch pipes are connected in series via a second elbow. The branch pipe located at the water inlet end, which is not connected through the second elbow, is connected to the input pipe at one end, and the branch pipe located at the water outlet end, which is not connected through the second elbow, is connected to the evaporation pipe at the other end.

5. The novel heat exchanger according to claim 4, characterized in that, The bottom of the housing is provided with a collection tank for collecting condensate from the second heat exchange fin assembly. The bottom of the collection tank is provided with an output pipe for connecting to an external pipeline to discharge the condensate.

6. The novel heat exchanger according to claim 5, characterized in that, It also includes a collection tank and a water pump. The inlet of the collection tank is connected to the outlet pipe, the outlet of the collection tank is connected to the input of the water pump, and the output of the water pump is connected to the input pipe.

7. The novel heat exchanger according to claim 1, characterized in that, The evaporator tube is provided with a plurality of vent holes spaced apart along its length, so that the condensate introduced through the discharge tube absorbs heat and vaporizes, and is discharged to the outside through the vent holes.

8. The novel heat exchanger according to claim 7, characterized in that, The diameters of the discharge pipe and the evaporation pipe are both smaller than the diameters of the first heat exchange pipe and / or the second heat exchange pipe.

9. The novel heat exchanger according to claim 2, characterized in that, The second heat exchange fin assembly includes a second heat exchange fin and a third heat exchange fin, and the second heat exchange tube includes a first straight tube and a second straight tube; multiple first straight tubes are arranged at intervals and pass through the second heat exchange fins, and multiple second straight tubes are arranged at intervals and pass through the third heat exchange fins; the first straight tubes and the second straight tubes are connected in series in sequence through a third elbow. The first straight pipe located at the water inlet end, which is not connected through the third elbow, is connected to the cold water inlet pipe at one end, and the second straight pipe located at the water outlet end, which is not connected through the third elbow, is connected to one end of the first heat exchange pipe through the connecting pipe at one end.

10. The novel heat exchanger according to claim 9, characterized in that, The first heat exchange fins are provided in a plurality of portions and are arranged at intervals along the length direction of the first heat exchange tube; the second heat exchange fins are provided in a plurality of portions and are arranged at intervals along the length direction of the first straight tube; and the third heat exchange fins are provided in a plurality of portions and are arranged at intervals along the length direction of the second straight tube.

Images