Modularized cleanable snake-shaped double-pipe heat exchanger

Abstract

The invention discloses a modular cleanable snake-shaped double-pipe heat exchanger, which belongs to the technical field of heat exchange equipment, and comprises at least one group of heat exchange modules, and fluid conveying pipelines for connecting the heat exchange modules in parallel are arranged at two ends of the heat exchange modules; the heat exchange module comprises a plurality of inner pipes arranged in parallel; the inner pipe is coaxially sleeved with the outer pipes, the two ends of each inner pipe penetrate out of the corresponding outer pipe, the two ends of each outer pipe are provided with closing plates allowing the corresponding inner pipe to pass through, and the inner walls of the outer pipes, the outer walls of the inner pipes and the closing plates jointly define a closed interlayer space; the adjacent outer pipes are communicated through a first connecting pipe to form a snakelike turn-back first fluid channel; the turbulent flow inner core is arranged in the inner pipe in a drawing and inserting manner; and a plurality of inner pipes are connected in series to form a detachable connecting structure of a snake-shaped turn-back second fluid channel, so that the turbulent flow inner core is convenient to mount and dismount. The problems that an inner pipe of an existing snake-shaped double-pipe heat exchanger is difficult to clean, the heat exchange intensity is limited, and expansion is inconvenient are solved.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and in particular to a modular, washable serpentine tube heat exchanger. Background Technology

[0002] The serpentine heat exchanger is a common heat exchange device widely used in chemical, refrigeration, heat pump, and central air conditioning industries. Its basic structure consists of two coaxially fitted tubes of different diameters, forming two independent fluid channels. Multiple sections of this tube are connected in series via elbows, coiled into a serpentine shape, thus achieving a longer heat exchange path within a limited space. The serpentine heat exchanger has advantages such as simple structure, high pressure resistance, and ease of achieving pure counter-current heat exchange, making it widely used in high-pressure conditions or scenarios requiring high heat exchange efficiency.

[0003] However, existing serpentine heat exchangers have the following inherent drawbacks in practical applications: Cleaning difficulties: The inner tubes of a serpentine heat exchanger have a slender, curved structure. When impurities in the fluid scale on the inner wall of the tubes, the bends prevent mechanical cleaning with tools like brushes, unlike with straight tubes. Current technology typically relies on chemical cleaning methods, but chemical cleaning is not only ineffective against hard scale but also causes environmental pollution, and the wastewater is difficult to treat. Many serpentine heat exchangers have been forced to be scrapped due to ineffective cleaning of scale buildup in the inner tubes, severely limiting their application in media prone to scaling.

[0004] Limited heat transfer intensity: Under laminar or low-velocity conditions, a thick boundary layer forms near the wall of the tube, which is the main thermal resistance for heat transfer. Traditional serpentine tube heat exchangers rely solely on the bare tube wall for heat transfer and lack measures to actively disturb the boundary layer, resulting in a low heat transfer coefficient and difficulty in meeting increasingly stringent energy efficiency requirements.

[0005] Inconvenient Expansion: Traditional serpentine heat exchangers are mostly one-piece designs, with their heat exchange capacity fixed during manufacturing. When the system load increases, the capacity cannot be increased by adding heat exchange units; often, it is necessary to replace the entire unit with a larger one, resulting in wasted resources and increased investment. Attempting to increase the heat exchange area by extending the length of a single serpentine tube will lead to a sharp increase in fluid resistance, while the improvement in heat exchange efficiency is not significant, resulting in poor economic efficiency.

[0006] How to solve the problems of difficult cleaning of the inner tubes, limited heat exchange intensity, and inconvenience in expanding the capacity of existing serpentine tube heat exchangers has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a modular, washable serpentine tube heat exchanger. By combining a removable turbulent flow core inside the inner tube with a detachable connection structure, it addresses the industry pain point of the inability to mechanically clean the inner tube of a serpentine tube. The heat transfer coefficient is improved through the synergistic effect of the fins on the outer wall of the inner tube and the turbulent flow core inside. Parallel expansion of the heat exchange modules is achieved through pre-set interfaces on the fluid delivery pipeline. This solves the technical problems of existing serpentine tube heat exchangers, such as difficult inner tube cleaning, limited heat transfer intensity, and inconvenient expansion.

[0008] To achieve the above objectives, the present invention provides a modular, washable serpentine heat exchanger, comprising: at least one set of heat exchange modules, with fluid delivery pipelines connecting the heat exchange modules in parallel at both ends; each heat exchange module includes: multiple parallel inner tubes; multiple outer tubes coaxially sleeved on the inner tubes, with both ends of the inner tubes extending out of the outer tubes, and both ends of the outer tubes having sealing plates for the inner tubes to pass through; the inner walls of the outer tubes, the outer walls of the inner tubes, and the sealing plates together forming a closed interlayer space; adjacent outer tubes being connected by a first connecting pipe to form a serpentine zigzag first fluid channel; a turbulent inner core removably disposed inside the inner tubes; and a detachable connecting structure connecting the multiple inner tubes in series to form a serpentine zigzag second fluid channel, facilitating the installation and disassembly of the turbulent inner core.

[0009] Preferably, the fluid transport pipeline includes a first fluid inflow main pipe, a first fluid outflow main pipe, a second fluid inflow main pipe, and a second fluid outflow main pipe; each of the first fluid inflow main pipe, the first fluid outflow main pipe, the second fluid inflow main pipe, and the second fluid outflow main pipe is provided with a plurality of preset interfaces for connecting to heat exchange modules; when there is a group of heat exchange modules, the first fluid channel inlet, the first fluid channel outlet, the second fluid channel inlet, and the second fluid channel outlet of the group of heat exchange modules are respectively connected to the preset interfaces on the corresponding main pipe; when there are multiple groups of heat exchange modules, the first fluid channel inlet, the first fluid channel outlet, the second fluid channel inlet, and the second fluid channel outlet of the multiple groups of heat exchange modules are respectively connected to the preset interfaces on the corresponding main pipe, and the multiple groups of heat exchange modules form a parallel relationship among the four main pipes; the heat exchange capacity of the heat exchanger can be adjusted by adding or removing heat exchange modules connected to the preset interfaces.

[0010] Preferably, the first fluid inflow main, the first fluid outflow main, the second fluid inflow main, and the second fluid outflow main are arranged perpendicular to the heat exchange module, and the four mains are parallel to each other; at one end of the heat exchange module, the first type of connection port near the outer pipe port serves as the inlet of the first fluid channel and is connected to the first fluid inflow main, and the inner pipe port serves as the outlet of the second fluid channel and is connected to the second fluid outflow main; at the other end of the heat exchange module, the first type of connection port near the outer pipe port serves as the outlet of the first fluid channel and is connected to the first fluid outflow main, and the inner pipe port serves as the inlet of the second fluid channel and is connected to the second fluid inflow main; the first fluid and the second fluid flow in opposite directions within the heat exchange module, forming countercurrent heat exchange.

[0011] Preferably, the connection structure includes: a plug disposed at the end of the inner tube, and a second connecting pipe connected between adjacent inner tubes. The plug is used to close the port of the inner tube, and the turbulent inner core is allowed to be extracted from the inner tube after the plug is opened. A second type of connection port is opened near the end of the inner tube, and the second connecting pipe connects the adjacent inner tubes through the second type of connection port to form a serpentine second fluid channel.

[0012] Preferably, the connection structure includes a bend and a union; the ports of adjacent inner tubes are connected in series through the bend and the union to form a serpentine second fluid channel; the union allows the turbulent inner core to be extracted from the inner tube after it is opened.

[0013] Preferably, the turbulent inner core has a twisted strip structure.

[0014] Preferably, the outer wall of the inner tube is provided with fins to increase the heat exchange area.

[0015] Preferably, the fins are spirally wound fins or longitudinally straight fins.

[0016] Preferably, the turbulent inner core is provided with pull rings at both ends.

[0017] Preferably, the outer tube has a first type of connection port near its end, and the first connecting tube connects multiple outer tubes in series through the first type of connection port to form a serpentine first fluid channel.

[0018] The advantages and positive effects of the modular, washable serpentine tube heat exchanger described in this invention are: 1. Easy Cleaning: This invention features an openable sealing section at the end of the serpentine tube and an insertable turbulent flow core inside the inner tube. After opening the sealing section and removing the turbulent flow core, the inner tube forms an unobstructed channel for mechanical cleaning tools to enter, allowing cleaning of the inner tube to be completed without disassembling the equipment. This effectively solves the industry problem of the inability to mechanically clean the inner cavity of the serpentine tube.

[0019] 2. Improved heat transfer coefficient: This invention features fins on the outer wall of the inner tube to increase the heat transfer area; and a twisted turbulent core inside the inner tube forces the fluid to flow in a spiral pattern, disrupting the boundary layer and reducing thermal resistance. The synergistic effect of the fins and the turbulent core results in a significantly higher overall heat transfer coefficient than traditional sleeve structures.

[0020] 3. Modular and Flexible Capacity Expansion: The four main pipes of this invention each have multiple pre-set interfaces, with each heat exchange module independently connected to a corresponding interface. When the heat exchange capacity needs adjustment, heat exchange modules can be added or removed directly without cutting or welding the main pipes, thus achieving flexible adjustment of the heat exchange capacity.

[0021] 4. Pure countercurrent heat exchange: In this invention, the first fluid inflow manifold and the second fluid outflow manifold are located on the same side of the heat exchange module, and the first fluid outflow manifold and the second fluid inflow manifold are located on the opposite side of the heat exchange module, so that the flow directions of the two fluids in the heat exchange module are always opposite, forming pure countercurrent heat exchange, maximizing the heat transfer temperature difference, and achieving optimal thermodynamic efficiency.

[0022] 5. High pressure resistance: The present invention adopts a small-diameter serpentine tube structure, which has a higher pressure resistance than plate heat exchangers and traditional shell and tube heat exchangers, and is suitable for high-pressure working conditions such as high-pressure refrigerants and high-pressure chemical fluids.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a front view of a first embodiment of a modular, washable serpentine tube heat exchanger according to the present invention; Figure 2 This is a top view of a first embodiment of a modular, washable serpentine tube heat exchanger according to the present invention; Figure 3 This is a partial frontal sectional view of a first embodiment of a modular, washable serpentine tube heat exchanger according to the present invention; Figure 4 This is a front view of a second embodiment of a modular, washable serpentine tube heat exchanger according to the present invention; Figure Labels 1. Outer pipe; 2. Inner pipe; 3. First connecting pipe; 4. Second connecting pipe; 5. First fluid inflow main pipe; 6. First fluid outflow main pipe; 7. Second fluid inflow main pipe; 8. Second fluid outflow main pipe; 9. Plug; 10. Bend; 11. Union joint; 12. Fin; 13. Turbulent flow core; 14. Preset interface of the first fluid inflow main pipe; 15. Preset interface of the first fluid outflow main pipe; 16. Preset interface of the second fluid inflow main pipe; 17. Preset interface of the second fluid outflow main pipe; 18. First fluid channel; 19. Second fluid channel. Detailed Implementation

[0025] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention 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 the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0027] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] Example 1 like Figures 1-3 As shown, this embodiment discloses a modular, washable serpentine heat exchanger, including at least one heat exchange module. Fluid delivery pipelines are provided at both ends of the heat exchange module, connecting the modules in parallel. The fluid delivery pipelines include a first fluid inlet main pipe 5, a first fluid outlet main pipe 6, a second fluid inlet main pipe 7, and a second fluid outlet main pipe 8. The four main pipes are arranged perpendicular to the heat exchange module and parallel to each other, collectively forming the main fluid distribution and collection system of the heat exchanger.

[0029] The heat exchange module includes multiple parallel inner tubes 2 and multiple coaxial outer tubes 1 sleeved on the inner tubes 2. The inner tubes 2 are longer than the outer tubes 1, and both ends of the inner tubes 2 extend beyond the ends of the outer tubes 1. The ends of the outer tubes 1 are fitted with sealing plates. The inner walls of the outer tubes 1, the outer walls of the inner tubes 2, and the sealing plates together form a closed interlayer space, which is a first fluid channel 18 used to contain a first fluid. The sealing plates seal both ends of the interlayer space to prevent fluid leakage from the ends, while allowing the inner tubes 2 to extend out. The first fluid channel 18 is used for the flow of the first fluid (such as refrigerant), and its serpentine zigzag structure provides a longer heat exchange path within a limited space.

[0030] The outer tube 1 has a first type of connection port on both sides near the port. The first connecting tube 3 connects multiple outer tubes 1 in series through the first type of connection port to form a serpentine return channel for the outer tubes 1, which is the first fluid channel 18. The first type of connection port is a through hole that passes through the wall of the outer tube 1 and communicates with the interlayer space. The two ends of the first connecting tube 3 are respectively inserted into the first type of connection port of the adjacent outer tube 1 and can be fixed by welding to form a sealed connection.

[0031] A turbulent flow core 13 is removably installed inside the inner tube 2. The turbulent flow core 13 has a twisted, elongated structure. When fluid flows through the inner tube 2, the turbulent flow core 13 forces the fluid to generate a spiral flow, disrupting the laminar boundary layer near the wall, thereby reducing convective heat transfer resistance and increasing the heat transfer coefficient. To facilitate insertion and removal, pull rings can be installed at one or both ends of the turbulent flow core 13. The pull rings can be made of bent metal wire and welded or riveted to the ends of the turbulent flow core 13, allowing operators to hook them with a hook-like tool for insertion and removal.

[0032] The end of the inner tube 2 extending out of the outer tube 1 is provided with a detachable connecting structure that connects multiple inner tubes 2 in series. This connecting structure allows the inner cavities of the multiple inner tubes 2 to be sequentially connected, forming a serpentine return channel for the inner tubes 2. This serpentine return channel is the second fluid channel 19. The detachable connecting structure facilitates the installation and removal of the turbulent flow core. The second fluid channel 19 is used for the flow of a second fluid (such as cold water).

[0033] The first fluid inflow main pipe 5, the first fluid outflow main pipe 6, the second fluid inflow main pipe 7, and the second fluid outflow main pipe 8 are each provided with multiple preset interfaces for connecting to the heat exchange module. These preset interfaces can be in the form of flanges, unions, or threaded joints, and their number and spacing are determined according to the size and arrangement of the heat exchange module. Multiple preset interfaces are reserved on each main pipe, and unused preset interfaces can be closed with blind flanges to facilitate subsequent expansion.

[0034] When the heat exchange modules are in one group, the inlet, outlet, inlet, and outlet of the first fluid channel 18, and the outlet of the second fluid channel 19 of that group of heat exchange modules are respectively connected to the preset interfaces on the corresponding main pipe. When there are multiple groups of heat exchange modules, the inlet, outlet, inlet, and outlet of the first fluid channel 18, the inlet, and the outlet of the second fluid channel 19 of each group of heat exchange modules are respectively connected to the preset interfaces on the corresponding main pipe, and the multiple groups of heat exchange modules form a parallel relationship among the four main pipes. The heat exchange capacity of the heat exchanger can be adjusted by adding or removing heat exchange modules connected to the interfaces. When it is necessary to increase the heat exchange capacity, it is only necessary to connect the four interfaces of the newly added heat exchange module to the reserved interfaces on each main pipe, without cutting or welding the main pipe, thus achieving rapid capacity expansion.

[0035] The first fluid inlet manifold 5, the first fluid outlet manifold 6, the second fluid inlet manifold 7, and the second fluid outlet manifold 8 are arranged perpendicular to the heat exchange module, and the four manifolds are parallel to each other.

[0036] At one end of the heat exchange module, the first type of connection port near the outer tube 1 serves as the inlet of the first fluid channel 18 and connects to the first fluid inflow main pipe 5. The inner tube 2 port serves as the outlet of the second fluid channel 19 and connects to the second fluid outflow main pipe 8. At the other end of the heat exchange module, the first type of connection port near the outer tube 1 serves as the outlet of the first fluid channel 18 and connects to the first fluid outflow main pipe 6, while the inner tube 2 port serves as the inlet of the second fluid channel 19 and connects to the second fluid inflow main pipe 7.

[0037] Specifically, the first fluid inflow manifold 5 is connected to the inlet of the first fluid channel 18 via a preset interface 14. The first fluid outflow manifold 6 is connected to the outlet of the first fluid channel 18 via a preset interface 15. The second fluid inflow manifold 7 is connected to the inlet of the second fluid channel 19 via a preset interface 16. The second fluid outflow manifold 8 is connected to the outlet of the second fluid channel 19 via a preset interface 14.

[0038] With this arrangement, the first fluid flows into the heat exchange module from the first fluid inlet pipe 5, flows through the serpentine reversal channel of the outer pipe 1, and then flows out from the first fluid outlet pipe 6. The second fluid flows into the heat exchange module from the second fluid inlet pipe 7, flows through the serpentine reversal channel of the inner pipe 2, and then flows out from the second fluid outlet pipe 8. The first and second fluids flow in opposite directions within the heat exchange module, forming counter-current heat exchange. Because the two fluids maintain opposite directions throughout the entire heat exchange path, the heat transfer temperature difference is always maintained at a large value, thereby achieving the highest thermodynamic efficiency.

[0039] The connection structure includes a plug 9 disposed at the end of the inner tube 2, and a second connecting pipe 4 connecting adjacent inner tubes 2. A second type of connection port is provided near the end of the inner tube 2, and the second connecting pipe 4 connects adjacent inner tubes 2 through the second type of connection port, forming a serpentine return channel for the inner tube 2. The plug 9 is used to close the port of the inner tube 2, and when the plug 9 is opened, it allows the turbulent inner core 13 to be extracted from the inner tube 2.

[0040] During normal operation, the plug 9 provides a tight seal. If scale buildup on the water side of the inner tube 2, leading to a decrease in heat exchange efficiency, occurs after a period of operation, the operator does not need to disassemble any piping. Simply close the valves before and after the single module, unscrew the plug 9, and use a tool to hook the pull ring at the end of the turbulent flow core 13, pulling it out of the inner tube 2 as a whole. Since the inner wall of the inner tube 2 is now unobstructed, the brush head of a flexible shaft cleaning machine can be inserted into the inner tube 2 through the plug 9 opening to physically remove scale along the inner cavity. For stubborn scale, high-pressure water jet cleaning can be used. After cleaning, reinsert the turbulent flow core 13, tighten the plug 9, and the equipment is restored to its original condition. The entire cleaning process requires no disassembly of the equipment piping, no use of chemical cleaning agents, is simple to operate, low in cost, and very environmentally friendly.

[0041] The outer wall of the inner tube 2 is provided with fins 12 to increase the heat exchange area. The fins 12 are wound or welded to the outer wall of the inner tube 2, which increases the heat exchange area on the first fluid side, thereby increasing the total heat exchange capacity. The fins 12 are either helically wound fins or longitudinal straight fins.

[0042] This invention features fins 12 on the outer wall of the inner tube 2 to increase the heat transfer area; and a twisted turbulent flow core 13 inside the inner tube 2 to force the fluid to flow in a spiral pattern, disrupting the boundary layer and reducing thermal resistance. The fins 12 and the turbulent flow core 13 work synergistically to achieve a significantly higher overall heat transfer coefficient than traditional sleeve structures.

[0043] To prevent the turbulent inner core 13 from vibrating and wearing down the tube wall under high flow velocities, centering supports are provided at both ends of the turbulent inner core 13. These centering supports are commonly used structures in this field and can be cross-shaped, star-shaped, or three-claw-shaped. Their outer edges contact the inner wall of the inner tube 2, supporting the turbulent inner core 13 at the center of the inner tube 2 and allowing fluid to pass through the gaps in the supports. By providing centering supports, the vibration of the turbulent inner core 13 under fluid impact can be effectively suppressed, preventing it from colliding and wearing down with the inner wall of the inner tube 2. Simultaneously, it ensures that the turbulent inner core 13 always remains in a centered position, allowing the fluid to form a uniform spiral flow within the tube, further improving heat transfer stability.

[0044] Example 2 like Figure 4 As shown, this embodiment discloses another connection structure. The connection structure includes a bend 10 and a union 11. The inner tube 2 does not have a second type of connection port. The ports of adjacent inner tubes 2 are connected in series through the bend 10 and the union 11 to form a serpentine return channel for the inner tube 2. When the union 11 is opened, it allows the turbulent inner core 13 to be extracted from the inner tube 2.

[0045] When cleaning the inner tube 2 is required, remove the union 11 and pull out the turbulent inner core 13 for mechanical cleaning. This structure eliminates the need for a second type of connection port on the side wall of the inner tube 2; the port of the inner tube 2 directly serves as a series interface.

[0046] Therefore, the modular, washable serpentine heat exchanger described in this invention addresses the industry pain point of the inability to mechanically clean the inner tube of serpentine heat exchangers through the combination of a removable turbulent inner core and a detachable connection structure. It enhances the heat transfer coefficient through the synergistic effect of the fins on the outer wall of the inner tube and the turbulent inner core. Furthermore, it enables parallel expansion of heat exchange modules by pre-setting interfaces on the fluid delivery pipeline. This solves the technical problems of existing serpentine heat exchangers, such as difficulty in cleaning the inner tube, limited heat transfer intensity, and inconvenience in capacity expansion.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A modular, washable serpentine tube heat exchanger, characterized in that, It includes at least one set of heat exchange modules, with fluid delivery pipelines connecting the heat exchange modules in parallel at both ends; The heat exchange module includes: Multiple parallel inner tubes; Multiple outer tubes are coaxially sleeved on the inner tube. The two ends of the inner tube extend out of the outer tube, and the two ends of the outer tube are provided with sealing plates to allow the inner tube to pass through. The inner wall of the outer tube, the outer wall of the inner tube, and the sealing plates together form a closed interlayer space. Adjacent outer tubes are connected by a first connecting tube to form a serpentine first fluid channel. A turbulent inner core that can be inserted and removed into the inner tube; Additionally, a detachable connection structure that connects multiple inner tubes in series to form a serpentine second fluid channel facilitates the installation and removal of the turbulent inner core.

2. The modular, washable serpentine heat exchanger according to claim 1, characterized in that: The fluid transport pipeline includes a first fluid inlet main pipe, a first fluid outlet main pipe, a second fluid inlet main pipe, and a second fluid outlet main pipe; The first fluid inlet manifold, the first fluid outlet manifold, the second fluid inlet manifold, and the second fluid outlet manifold are each provided with multiple preset interfaces for connecting to the heat exchange module. When the heat exchange modules are in a group, the first fluid channel inlet, the first fluid channel outlet, the second fluid channel inlet, and the second fluid channel outlet of the group of heat exchange modules are respectively connected to the preset interfaces on the corresponding main pipe; When there are multiple heat exchange modules, the first fluid channel inlet, first fluid channel outlet, second fluid channel inlet, and second fluid channel outlet of the multiple heat exchange modules are respectively connected to the preset interface on the corresponding main pipe, and the multiple heat exchange modules form a parallel relationship between the four main pipes; the heat exchange capacity of the heat exchanger can be adjusted by adding or removing heat exchange modules connected to the preset interface.

3. A modular, washable serpentine heat exchanger according to claim 2, characterized in that: The first fluid inlet main pipe, the first fluid outlet main pipe, the second fluid inlet main pipe, and the second fluid outlet main pipe are arranged perpendicular to the heat exchange module, and the four main pipes are parallel to each other. At one end of the heat exchange module, the first type of connection port near the outer tube port serves as the inlet of the first fluid channel and is connected to the first fluid inflow main pipe, while the inner tube port serves as the outlet of the second fluid channel and is connected to the second fluid outflow main pipe. At the other end of the heat exchange module, the first type of connection port near the outer tube port serves as the outlet of the first fluid channel and is connected to the first fluid outflow main pipe, while the inner tube port serves as the inlet of the second fluid channel and is connected to the second fluid inflow main pipe. The first fluid and the second fluid flow in opposite directions within the heat exchange module, forming countercurrent heat exchange.

4. A modular, washable serpentine heat exchanger according to claim 1, characterized in that: The connection structure includes: a plug disposed at the end of the inner tube, and a second connecting pipe connected between adjacent inner tubes. The plug is used to close the port of the inner tube, and when the plug is opened, it allows the turbulent inner core to be extracted from the inner tube. A second type of connection port is opened near the end of the inner tube, and the second connecting pipe connects adjacent inner tubes through the second type of connection port to form a serpentine second fluid channel.

5. A modular, washable serpentine heat exchanger according to claim 1, characterized in that: The connection structure includes a bend and a union; the ports of adjacent inner tubes are connected in series through the bend and the union to form a serpentine second fluid channel; when the union is opened, the turbulent inner core is allowed to be extracted from the inner tube.

6. A modular, washable serpentine heat exchanger according to claim 1, characterized in that: The turbulent inner core has a twisted, elongated structure.

7. A modular, washable serpentine heat exchanger according to claim 1, characterized in that: The outer wall of the inner tube is provided with fins to increase the heat exchange area.

8. A modular, washable serpentine heat exchanger according to claim 7, characterized in that: The fins are either spirally wound fins or longitudinally straight fins.

9. A modular, washable serpentine heat exchanger according to claim 1, characterized in that: Pull rings are provided at both ends of the turbulent inner core.

10. A modular, washable serpentine heat exchanger according to claim 1, characterized in that: The outer tube has a first type of connection port near its end. The first connecting tube connects multiple outer tubes in series through the first type of connection port to form a serpentine first fluid channel.

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