Heat exchanger for a clothes dryer

Abstract

The present application belongs to the technical field of heat exchangers, and particularly relates to a heat exchanger for a clothes dryer, comprising: a heat exchange core body, the heat exchange core body comprising fins, a right side plate and a left side plate, the right side plate and the left side plate each being provided with a bending limiting structure on the side close to the fins for clamping and fixing the fins; a copper pipe pipeline assembly, the copper pipe pipeline assembly comprising a plurality of communicating pipes and a plurality of cross pipes, the bending limiting structures provided on the left side plate and the right side plate can clamp the fins, the copper pipe pipeline assembly adopts a multi-group parallel heat exchange loop structure, which can improve the refrigerant flow efficiency and the heat exchange coverage area, and improve the overall heat exchange efficiency; the communicating pipes are fixedly penetrated into the assembly mode of the fins inside, can be fitted with the heat exchange structure, reduce the thermal resistance, improve the heat exchange conduction efficiency, the shunt joint assembly is arranged at the pipeline shunt node, can realize uniform refrigerant shunting and converging, ensure the balanced refrigerant supply of each group of parallel heat exchange loops, and avoid the problems of uneven local heat exchange and differentiated heat exchange efficiency.

Description

Technical Field

[0001] This invention belongs to the field of heat exchanger technology, and particularly relates to a heat exchanger for a clothes dryer. Background Technology

[0002] With the rapid iteration of smart home technology and the improvement of residents' quality of life, heat pump dryers, with their advantages of energy efficiency, uniform drying, and good garment care, have gradually replaced traditional drying equipment and become the mainstream product in the home appliance market. As the core heat exchange component of the dryer's heat pump system, the heat exchanger undertakes the core functions of air cooling, dehumidification, and heat exchange. Its structural design, heat exchange efficiency, and operational stability directly determine the dryer's drying rate, energy consumption level, and overall lifespan, making it a key component ensuring the dryer's efficient and stable operation.

[0003] Firstly, the existing heat exchanger's flat plate structure of the fins has a limited heat exchange contact area. When the airflow passes through the fins, it mostly remains in a laminar flow state, resulting in weak convective heat transfer and low heat exchange utilization. At the same time, the flat fins lack a flow guiding structure, so the condensate generated during the heat exchange process of the dryer easily condenses and accumulates on the fin surface, which cannot be discharged quickly. This not only blocks the airflow channels and further reduces the heat exchange efficiency, but also easily breeds scale and absorbs lint and impurities from clothing. Long-term use can easily cause fin blockage and heat exchange failure, significantly shortening the service life of the equipment.

[0004] Secondly, the existing heat exchanger copper tubes adopt a common smooth straight tube splicing structure, with many pipe splicing interfaces, resulting in a high risk of refrigerant leakage. In addition, the smooth inner wall of the tubes cannot disturb the refrigerant, so the refrigerant always remains in a laminar flow state. The heat exchange contact area is small and the residence time is short, making it difficult to improve the heat exchange efficiency inside the tubes. Conventional diversion joints lack positioning and limiting structures, making it impossible to accurately control the insertion depth of the copper tubes. This can easily lead to faults such as pipe loosening and leakage. Furthermore, the diversion uniformity is poor, and the refrigerant supply to each heat exchange loop is unbalanced, resulting in large differences in local heat exchange in the heat exchanger and insufficient uniformity of drying of the entire machine.

[0005] Based on this, this application proposes a heat exchanger for a clothes dryer to solve the problems existing in the prior art, optimize the heat exchange structure, improve heat exchange efficiency, and ensure stable operation of the equipment. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned technical problems by providing a heat exchanger for a clothes dryer.

[0007] A heat exchanger for a clothes dryer includes: The heat exchange core includes fins, a right side plate and a left side plate. The right side plate and the left side plate are provided with bending limiting structures on the side near the fins for clamping and fixing the fins. A copper tube piping assembly, comprising several connecting pipes and several cross pipes, wherein the two ends of the cross pipes are respectively connected to the corresponding connecting pipes to form multiple sets of parallel heat exchange circuits, and the connecting pipes are inserted and fixed inside the fins of the heat exchange core. Diverter assembly, wherein the diverter assembly is fixedly connected to the diverter node of the copper pipe assembly; The inlet / outlet pipe assembly includes a first pipe, a second pipe, and a third pipe. The ends of the first, second, and third pipes are all connected to a diverter assembly, and the other ends of the second and third pipes are connected to a connecting pipe. The first pipe serves as a water supply passage. After the medium is introduced into the diverter assembly through the first pipe, it is diverted and transported to the inside of the connecting pipe by the second and third pipes.

[0008] Furthermore, the fin surface is coated with a hydrophilic coating, and the fin has a continuous wavy, concave-convex flow-guiding structure.

[0009] Furthermore, the fins have several flared openings, and several of the connecting tubes pass through the corresponding openings.

[0010] Furthermore, the connecting pipe is a long U-shaped copper pipe with internal threads.

[0011] Furthermore, the diversion connector assembly is a trouser-shaped diversion tee, and the inner wall of the trouser-shaped diversion tee is provided with a dotted positioning groove for fixing the insertion depth of the copper pipe.

[0012] Furthermore, the first connecting pipe is installed at the inlet end of the trouser-shaped diverter tee, and the second and third connecting pipes are installed at the diverter ends of the trouser-shaped diverter tee.

[0013] Furthermore, the first connector is a straight section with a gradually changing diameter structure, the second connector is an integrated bending and gradually reducing diameter structure, and the third connector is a composite double bending structure.

[0014] Furthermore, a rubber sealing plug is fitted inside the opening.

[0015] Furthermore, the bending portion includes a plurality of bending plates disposed on one side of the corresponding right side plate and left side plate.

[0016] Furthermore, an external connecting pipe is provided on one side of several of the connecting pipes, and the external connecting pipe is connected to one of the connecting pipes.

[0017] Compared with the prior art, the heat exchanger for a clothes dryer of the present invention has the following advantages: The bending and limiting structures on the left and right side plates can clamp the fins. The copper pipe assembly adopts a multi-group parallel heat exchange loop structure, which can improve the refrigerant flow efficiency and heat exchange coverage area, thereby improving the overall heat exchange efficiency. The assembly method of the connecting pipe being fixed inside the fins can fit the heat exchange structure, reduce thermal resistance, and improve heat exchange conduction efficiency. The diversion joint assembly is arranged at the pipe diversion node, which can realize the uniform diversion and convergence of refrigerant, ensuring the balanced refrigerant supply of each group of parallel heat exchange loops, avoiding the problems of uneven local heat exchange and differences in heat exchange efficiency. The inlet and outlet liquid connection pipe assembly is equipped with a first, second, and third connection pipe, which respectively connect to the convergence end of the diversion joint and the end of the connecting pipe, forming a refrigerant input and output circulation path. It is adapted to the overall working logic of the dryer evaporator, ensuring the sealed connection and stable operation of the refrigerant circulation system, and improving the stability and uniformity of the dryer's drying operation. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a schematic diagram of the right side panel of the present invention; Figure 3 This is a schematic diagram of the right side plate and the diversion connector assembly of the present invention; Figure 4 This is a schematic diagram of the fins of the present invention; Figure 5 This is a schematic diagram of the opening of the present invention; Figure 6 This is a schematic diagram of the left side panel of the present invention; Figure 7 This is a schematic diagram of the bent plate of the present invention; Figure 8 This is a schematic diagram of the diversion connector assembly of the present invention; The markings in the diagram are as follows: 1. Right side plate; 2. Fin; 3. Connecting pipe; 4. Cross pipe; 5. Diverter assembly; 6. First connecting pipe; 7. Second connecting pipe; 8. Third connecting pipe; 9. Opening; 10. Dotted positioning groove; 11. Rubber sealing plug; 12. Outer connecting pipe; 13. Left side plate; 14. Bending plate. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0021] In the description of this invention, unless otherwise explicitly 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; 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.

[0022] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] Reference Figures 1-8 A heat exchanger for a clothes dryer, comprising: The heat exchange core includes fins 2, a right side plate 1 and a left side plate 13. Both the right side plate 1 and the left side plate 13 are provided with bending limiting structures on the side near the fins 2 for clamping and fixing the fins 2. A copper pipe assembly, comprising several connecting pipes 3 and several cross pipes 4, wherein the two ends of the cross pipes 4 are respectively connected to the corresponding connecting pipes 3 to form multiple sets of parallel heat exchange circuits, and the connecting pipes 3 are inserted and fixed inside the fins 2 of the heat exchange core. Diverter assembly 5, wherein the diverter assembly 5 is fixedly connected to the diverter node of the copper pipe assembly; The inlet / outlet pipe assembly includes a first pipe 6, a second pipe 7, and a third pipe 8. The ends of the first pipe 6, the second pipe 7, and the third pipe 8 are all connected to the diverter assembly 5, and the other ends of the second pipe 7 and the third pipe 8 are connected to the connecting pipe 3. The first pipe 6 serves as a water supply passage. After the medium is introduced into the diverter assembly 5 through the first pipe 6, it is diverted and transported to the inside of the connecting pipe 3 by the second pipe 7 and the third pipe 8.

[0024] When in use, the device uses the bending and limiting structure set on the left side plate 13 and the right side plate 1 to clamp the fins 2. The copper pipe assembly adopts a multi-group parallel heat exchange loop structure, which can improve the refrigerant flow efficiency and heat exchange coverage area, thereby improving the overall heat exchange efficiency. The assembly method of the connecting pipe 3, which is fixed inside the fins 2, can fit the heat exchange structure, reduce thermal resistance, and improve heat exchange conduction efficiency. The diversion joint assembly 5 is arranged at the pipe diversion node, which can realize the uniform diversion and convergence of refrigerant, ensure the balanced refrigerant supply of each group of parallel heat exchange loops, and avoid the problems of uneven local heat exchange and differences in heat exchange efficiency. The inlet and outlet liquid pipe assembly is set with the first pipe 6, the second pipe 7, and the third pipe 8 respectively connecting to the convergence end of the diversion joint and the end of the connecting pipe 3, forming a refrigerant input and output circulation path, which is adapted to the overall working logic of the dryer evaporator, ensuring the sealed connection and stable operation of the refrigerant circulation system, and improving the stability and uniformity of the dryer's drying operation.

[0025] In the example of this application, the surface of the fin 2 is coated with a hydrophilic coating, and the fin 2 has a continuous wavy concave-convex flow guiding structure.

[0026] As a preferred example of the present invention, the hydrophilic coating sprayed on the surface of the fin 2 can improve the hydrophilicity of the fin 2 surface. The condensate generated during the heat exchange process of the dryer can spread and flow out quickly and evenly, avoiding condensation and water accumulation on the surface of the fin 2. This prevents water accumulation from blocking the airflow channel and reducing the heat exchange efficiency, and can reduce the adhesion of scale and impurities. The continuous wave-shaped concave-convex flow guide structure can extend the heat exchange contact path between the air and the fin 2, increase the gas-liquid heat exchange contact area, and at the same time create a disturbance effect on the airflow flowing through the heat exchanger, breaking the laminar flow state of the airflow, enhancing the convective heat exchange effect, improving the heat exchange rate and drying efficiency of the dryer, and reducing drying energy consumption.

[0027] In the example of this application, the fin 2 has a plurality of trumpet-shaped openings 9, and a plurality of the communicating tubes 3 pass through the corresponding openings 9.

[0028] As a preferred example of the present invention, the flared opening 9 on the fin 2 has a dual function of guiding and adapting. The flared opening structure can play a guiding role when the connecting pipe 3 is inserted and assembled, reducing the difficulty of inserting and assembling the copper pipe, avoiding bending of the copper pipe and deformation of the fin 2 during the assembly process, improving assembly efficiency and product qualification rate. The flared opening 9 can realize the close fit and adaptation installation of the connecting pipe 3 and the fin 2, reduce the assembly gap, reduce the heat exchange blind zone, ensure the continuity and efficiency of heat conduction between the fin 2 and the copper pipe, improve the overall heat exchange performance, and adapt to the high-frequency and long-term heat exchange work requirements of the dryer.

[0029] In the example of this application, the connecting pipe 3 is a long U-shaped copper pipe with internal threads.

[0030] As a preferred example of the present invention, a long U-shaped copper tube with internal threads is used as the connecting pipe 3. The copper tube itself has excellent thermal conductivity, which can realize the heat exchange between the refrigerant and the fins 2 and the air. The threaded structure on the inner wall of the tube can disturb the refrigerant flowing inside, break the laminar flow state of the refrigerant, prolong the heat exchange residence time of the refrigerant, increase the contact area between the refrigerant and the tube wall, and greatly improve the heat exchange efficiency inside the tube. The long U-shaped integrated structure can reduce the number of pipe splicing interfaces, reduce the risk of refrigerant leakage, adapt to the layout requirements of multiple parallel heat exchange circuits, and has a compact structure and small space occupation.

[0031] In the example of this application, the diversion connector assembly 5 is a trouser-type diversion tee, and the inner wall of the trouser-type diversion tee is provided with a dotted positioning groove 10 for fixing the insertion depth of the copper pipe.

[0032] As a preferred example of the present invention, the trouser-shaped diverter tee serves as the diverter connector component 5, which can realize the diversion and uniform distribution of refrigerant, ensuring the uniform and stable overall heat exchange performance of the heat exchanger. The dotted limiting positioning groove 10 set on the tee can limit the insertion depth of the copper tube, avoid the pipe from becoming loose and leaking due to shallow insertion, improve the sealing of the pipe assembly connection, and reduce the probability of equipment failure.

[0033] In the example of this application, the first connecting pipe 6 is installed at the inlet end of the trouser-shaped diverter tee, and the second connecting pipe 7 and the third connecting pipe 8 are installed at the diverter end of the trouser-shaped diverter tee.

[0034] As a preferred example of the present invention, by defining the assembly positions of the first connecting pipe 6, the second connecting pipe 7, the third connecting pipe 8 and the trouser-shaped branch tee, the complete path for refrigerant input, branching and output is clearly defined. The first connecting pipe 6 serves as the main inlet to uniformly introduce refrigerant to the branch tee to complete the branching heat exchange. After the heat exchange of each group of parallel heat exchange circuits is completed, they are uniformly merged into the converging tee, and discharged into the connecting pipe 3 through the second connecting pipe 7 and the third connecting pipe 8 as the outlets. This adapts to the refrigerant circulation logic of multiple groups of parallel heat exchange circuits, and the refrigerant flows smoothly without obstruction.

[0035] In the example of this application, the first connecting pipe 6 is a straight section with a gradually changing diameter structure, the second connecting pipe 7 is an integrated bending and gradually reducing diameter structure, and the third connecting pipe 8 is a composite double bending structure.

[0036] As a preferred example of the present invention, the straight section of the first connecting pipe 6 with a gradually changing diameter structure can smoothly adjust the inlet refrigerant flow rate and the internal pressure of the pipeline; the integrated bending and gradually decreasing diameter structure of the second connecting pipe 7 is adapted to the narrow assembly space at the collection end; the composite double bending shape of the third connecting pipe 8 can avoid the internal shell of the dryer, the fan and other components, and avoid pipeline assembly interference.

[0037] In the example of this application, a rubber sealing plug 11 is fitted inside the opening 9.

[0038] As a preferred example of the present invention, the rubber sealing inner plug 11 is sleeved on the outer wall of the connecting pipe 3 and fitted into the inner wall of the horn flange. It can seal the assembly gap between the connecting pipe 3 and the opening 9 of the fin 2, effectively preventing air, condensate, and impurities from entering the gap during heat exchange, avoiding dirt accumulation in the gap, strengthening the connection sealing and tightness between the pipe and the fin 2, reducing pipe loosening and abnormal noise caused by equipment operation vibration, avoiding heat exchange short circuit caused by airflow through the gap, and improving heat exchange utilization.

[0039] In the example of this application, the bending portion includes a plurality of bending plates 14 disposed on one side of the corresponding right side plate 1 and left side plate 13, and the bending plates 14 and the side plates are integrally stamped.

[0040] As a preferred example of the present invention, a bending limiting structure is formed by setting multiple sets of bending plates 14 on the inner side of the left and right side plates 1. Compared with the overall bending structure, the limiting clamping force of the multi-point bending plates 14 is more uniform, which can avoid local deformation and warping of the fins 2 and effectively protect the integrity of the wave guide structure of the fins 2.

[0041] In the example of this application, an external pipe 12 is provided on one side of several of the connecting pipes 3. The external pipe 12 is connected to one of the connecting pipes 3, and a detachable sealing plug is installed at the end of the external pipe 12.

[0042] As a preferred example of the present invention, during normal drying operation, the pipeline is sealed by the plug to prevent refrigerant leakage; during maintenance, the plug can be removed and 12 external pipes can be connected to complete the system replenishment, depressurization, and drainage operations; it can also be used as a backup flow port to balance the internal pressure of the pipeline, alleviate the local pressure peak during the refrigerant circulation process, reduce the pressure load on the pipeline, and avoid high-pressure damage and leakage problems in the pipeline.

[0043] During use, the cooling medium enters the equipment through the first pipe 6 of the inlet / outlet pipe assembly. The medium is distributed by the trouser-shaped tee. After being evenly distributed by the diverter assembly 5, the cooling medium is delivered to the second pipe 7 and the third pipe 8 respectively. Then, the cooling medium is diverted through the second pipe 7 and the third pipe 8 to the connecting pipes 3 formed by the internally threaded long U copper tubes. Multiple sets of connecting pipes 3 form a parallel heat exchange circuit. After heat exchange, the refrigerant flows out through the tail of each set of connecting pipes 3 and is uniformly delivered back to the compressor through the external pipe 12, completing the closed-loop refrigerant circulation of the whole machine. During the process of the cooling medium flowing through the connecting pipe 3, the threaded structure on the inner wall of the pipe can effectively disturb the internal medium, break the laminar flow state of the medium, prolong the heat exchange residence time of the medium, increase the contact area between the medium and the copper pipe wall, and enhance the heat exchange effect inside the pipe. The connecting pipe 3 is inserted and fixed inside the corrugated fins 2 of the heat exchange core. The trumpet-shaped opening 9 on the fins 2 not only reduces the difficulty of copper pipe assembly and achieves a close fit between the pipe wall and the fins 2, but also, with the rubber sealing plug 11 installed inside the opening 9, completely seals the assembly gap, prevents heat exchange short circuit caused by dirt accumulation and airflow, and ensures the continuity and efficiency of heat conduction. The left side plate 13 and right side plate 1 of the heat exchange core form a bending and limiting structure through a multi-point bending plate 14, which evenly clamps and fixes the wavy fins 2, preventing the fins 2 from deforming or warping under stress, and completely preserving the concave and convex flow guiding structure of the fins 2. During operation, when the hot and humid airflow inside the dryer flows through the surface of the fins 2, the continuous wave structure can extend the gas-liquid heat exchange contact path, disturb the airflow and break the laminar flow state, and greatly improve the convective heat exchange efficiency. The hydrophilic coating on the surface of the fins 2 can allow the condensate generated by heat exchange to spread and flow out quickly, eliminating the problems of condensation, water accumulation, blockage of airflow channels and scale adhesion, continuously ensuring a high-efficiency heat exchange state, realizing the cooling and dehumidification of the air inside the dryer, and completing the drying operation. Under normal drying conditions, the external pipe 12 on one side of the connecting pipe 3 is sealed by the end plug to prevent leakage of cooling medium and ensure the airtightness and operational stability of the entire refrigerant circulation system. When the equipment needs maintenance, pressure relief, sewage discharge, or abnormal pipeline pressure, the removable end plug of the external pipe 12 can be removed to allow the cooling medium, residual sewage, or high-pressure gas inside the pipeline to be discharged through the external pipe 12. System liquid replenishment and pipeline pressure relief can be completed through the external pipe 12, effectively balancing the internal pressure of the pipeline, alleviating local pressure peaks during the refrigerant circulation process, reducing the pressure load on the pipeline, avoiding high-pressure damage and medium leakage, and significantly improving the service life and operational safety of the equipment.

[0044] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A heat exchanger for a clothes dryer, characterized in that, include: The heat exchange core includes fins (2), a right side plate (1) and a left side plate (13). Both the right side plate (1) and the left side plate (13) are provided with bending limiting structures on the side near the fins (2) for clamping and fixing the fins (2). The copper pipe pipeline assembly includes several connecting pipes (3) and several cross pipes (4). The two ends of the several cross pipes (4) are respectively connected to the corresponding connecting pipes (3) to form multiple sets of parallel heat exchange circuits. The connecting pipes (3) are inserted and fixed inside the fins (2) of the heat exchange core. Diverter assembly (5), the diverter assembly (5) is fixedly connected to the diverter node of the copper pipe assembly; The inlet and outlet liquid connection assembly includes a first connection (6), a second connection (7) and a third connection (8). The ends of the first connection (6), the second connection (7) and the third connection (8) are all connected to the diversion connector assembly (5), and the other ends of the second connection (7) and the third connection (8) are connected to the connecting pipe (3). The first connection (6) serves as a water supply passage. After the medium is introduced into the diversion connector assembly (5) through the first connection (6), it is diverted and transported to the inside of the connecting pipe (3) by the second connection (7) and the third connection (8).

2. A heat exchanger for a clothes dryer according to claim 1, characterized in that, The surface of the fin (2) is coated with a hydrophilic coating, and the fin (2) has a continuous wave-shaped concave-convex flow guiding structure.

3. A heat exchanger for a clothes dryer according to claim 1, characterized in that, The fin (2) has several trumpet-shaped openings (9), and several of the connecting tubes (3) pass through the corresponding openings (9).

4. A heat exchanger for a clothes dryer according to claim 1, characterized in that, The connecting pipe (3) is a long U-shaped copper pipe with internal threads.

5. A heat exchanger for a clothes dryer according to claim 1, characterized in that, The diversion connector assembly (5) is a trouser-type diversion tee, and the inner wall of the trouser-type diversion tee is provided with a dotted positioning groove (10) for fixing the insertion depth of the copper pipe.

6. A heat exchanger for a clothes dryer according to claim 1, characterized in that, The first connecting pipe (6) is installed at the inlet end of the trouser-shaped diverter tee, and the second connecting pipe (7) and the third connecting pipe (8) are installed at the diverter end of the trouser-shaped diverter tee.

7. A heat exchanger for a clothes dryer according to claim 6, characterized in that, The first connector (6) is a straight section with a gradually changing diameter structure, the second connector (7) is an integrated bending and gradually reducing diameter structure, and the third connector (8) is a composite double bending structure.

8. A heat exchanger for a clothes dryer according to claim 3, characterized in that, The opening (9) is fitted with a rubber sealing plug (11).

9. A heat exchanger for a clothes dryer according to claim 1, characterized in that, The bending section includes several bending plates (14) disposed on one side of the corresponding right side plate (1) and left side plate (13).

10. A heat exchanger for a clothes dryer according to claim 1, characterized in that, An external pipe (12) is provided on one side of several of the connecting pipes (3), and the external pipe (12) is connected to one of the connecting pipes (3).

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