A finned tube heat exchanger suitable for rail air conditioning

Abstract

The application discloses a finned tube heat exchanger suitable for a rail air conditioner, which comprises a front end plate, a rear end plate, a heat exchange pipe system, heat exchange fins and an air adjusting device; the front end plate and the rear end plate are arranged at two ends of the heat exchange pipe system respectively; the heat exchange space is formed between the front end plate and the rear end plate, a plurality of heat exchange fins parallel to the end plates are arranged in the heat exchange space at intervals, and the heat exchange air flow channels are formed between the adjacent two heat exchange fins; the air adjusting device is arranged at the upper end and / or the lower end of the heat exchange space, the air adjusting device auxiliary air vent is arranged on the air adjusting device, and the air adjusting device can adjust the opening degree of the air adjusting device auxiliary air vent to realize the adjustment of the flow of the heat exchange air entering the heat exchange space. The finned tube heat exchanger suitable for the rail air conditioner has the advantages of compact structure and the like, and can increase the heat exchange capacity of the heat exchanger and improve the heat exchange efficiency without increasing the fan rotating speed and changing the size of the heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology for rail vehicles, and in particular to a tube-fin heat exchanger suitable for rail air conditioning. Background Technology

[0002] To improve the operating efficiency of air conditioning units in the rail transit sector, it is essential to enhance the heat exchange capacity of the outdoor heat exchanger. This is the primary measure for improving the energy efficiency of air conditioning units. Without increasing energy consumption, existing technologies mainly increase the heat exchange area of ​​the heat exchanger by increasing the heat exchange area, such as by adding fins or changing the fin structure. For example, patent CN114963845A discloses fins, a heat exchanger, and an air conditioning system, which modifies the position of the fin tube holes and the arrangement of the fins to increase the probability of contact between the leeward side of the heat exchange tube and the air, thereby improving the heat exchange efficiency between the leeward side of the heat exchange tube and the air. Air conditioning units in the rail transit sector have a significant demand for heat exchange, and due to the height restrictions of the air conditioning unit, the position of the heat exchange tubes and the space for the fin arrangement are limited. Therefore, heat exchange tubes are generally arranged in four or more rows. In addition, sometimes the heat exchanger needs to be placed at an angle within the condensing chamber, thus placing certain requirements on the airflow of the heat exchanger. Given the above practical needs, the existing conventional operation will install upper and lower cover plates at both ends of the heat exchanger to form a flow channel, prevent air from escaping, and allow air to pass through all the heat exchange tubes, thereby increasing the effective heat exchange area between the air and the heat exchange tubes.

[0003] However, under actual working conditions, the existing structure still cannot meet the requirements of high energy efficiency. Without increasing energy consumption, a new high-efficiency heat exchange structure is urgently needed. Summary of the Invention

[0004] This invention addresses the aforementioned problems by proposing a tube-fin heat exchanger suitable for rail air conditioning.

[0005] The technical means employed in this invention are as follows:

[0006] A tube-fin heat exchanger suitable for rail air conditioning includes a front end plate, a rear end plate, a heat exchange tube system, heat exchange fins, and an air regulating device.

[0007] The front end plate and the rear end plate are respectively disposed at both ends of the heat exchange tube system;

[0008] A heat exchange space is formed between the front end plate and the rear end plate. Multiple heat exchange fins are arranged at intervals in the heat exchange space, parallel to the end plate. A heat exchange airflow channel is formed between two adjacent heat exchange fins.

[0009] The heat exchange space has a side that is perpendicular to the front end plate, the rear end plate, the upper end face, and the lower end face as the main air inlet, and the heat exchange air enters the heat exchange air flow channel through the main air inlet.

[0010] The upper and / or lower surfaces of the heat exchange space are provided with the air regulating device, and the air regulating device is provided with an auxiliary air regulating port. The air regulating device can adjust the opening and closing degree of the auxiliary air regulating port to regulate the flow rate of the heat exchange air entering the heat exchange space.

[0011] Furthermore, the air regulating device includes a stationary air regulating device plate and a movable air regulating device plate;

[0012] The two ends of the stationary plate of the air regulating device are fixedly connected to the front end plate and the rear end plate. The stationary plate of the air regulating device is provided with at least one stationary plate vent, and the moving plate of the air regulating device is provided with at least one moving plate vent. The moving plate of the air regulating device can move horizontally relative to the stationary plate of the air regulating device. When the moving plate of the air regulating device moves horizontally relative to the stationary plate of the air regulating device, the overlapping area of ​​the stationary plate vent and the moving plate vent changes to adjust the opening and closing degree of the auxiliary vent of the air regulating device.

[0013] Furthermore, the stationary plate or the moving plate of the air regulating device is provided with a slide rail, and the stationary plate and the moving plate of the air regulating device are connected by the slide rail.

[0014] Furthermore, the axial flow fan is positioned on one side of the tube-fin heat exchanger, making the tube-fin heat exchanger a counter-flow structure.

[0015] Furthermore, the heat exchange tube system includes a gas collecting pipe, heat exchange tubes, a U-shaped elbow, and a liquid collecting pipe;

[0016] The liquid collecting pipe is located on the air inlet side near the tube-fin heat exchanger, and the gas collecting pipe is located on the air outlet side near the tube-fin heat exchanger. The gas collecting pipe and the liquid collecting pipe are connected by the heat exchange pipe and the U-shaped elbow.

[0017] Furthermore, the upper and lower ends of the heat exchange fins are respectively fixedly connected to the static plates of the air regulating device located at the upper and lower ends.

[0018] Furthermore, the heat exchange fins are corrugated fins.

[0019] Furthermore, in the heat exchange system, n rows of heat exchange tubes are arranged sequentially from one end of the main air inlet to one end of the main air outlet; wherein, n≥4, and the rows of heat exchange tubes are parallel to each other.

[0020] Furthermore, the heat exchange tube is a U-shaped tube.

[0021] Furthermore, the front end plate and the rear end plate are also provided with a support plate on the side away from the heat exchange fins.

[0022] Compared with the prior art, the tube-fin heat exchanger for track air conditioning disclosed in this invention has the following beneficial effects: The tube-fin heat exchanger for track air conditioning disclosed in this invention has air regulating devices at the upper and lower ends of the heat exchange space. The air regulating devices are equipped with auxiliary ventilation ports that can adjust the opening and closing degree, thereby regulating the flow rate of heat exchange air entering the heat exchange space. This increases the heat exchange capacity and improves the heat exchange efficiency without increasing the fan speed or changing the size of the heat exchanger. It also has the advantages of compact structure. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the tube-fin heat exchanger for rail air conditioning disclosed in this invention.

[0024] Figure 2 This is a structural diagram of the tube-fin heat exchanger for rail air conditioning disclosed in this invention after removing the air regulating device.

[0025] Figure 3 This is a schematic diagram of the gas flow after the auxiliary ventilation opening of the air regulating device of the tube-fin heat exchanger for rail air conditioning disclosed in this invention is closed, without the air regulating device.

[0026] In the diagram: 1. Front end plate, 10. Heat exchange space, 11. Support plate, 2. Rear end plate, 3. Heat exchange tube system, 30. Air collection tube, 31. Heat exchange tube, 32. U-shaped bend, 33. Liquid collection tube, 4. Heat exchange fins, 40. Heat exchange airflow channel, 5. Air regulating device, 50. Fixed plate of air regulating device, 51. Moving plate of air regulating device, 52. Vent of fixed plate, 53. Vent of moving plate, 54. Slide rail. Detailed Implementation

[0027] like Figure 1 , Figure 2 and Figure 3 The image shows a tube-fin heat exchanger for rail air conditioning disclosed in this invention, including a front end plate 1, a rear end plate 2, a heat exchange tube system 3, heat exchange fins 4, and an air regulating device 5.

[0028] The front end plate 1 and the rear end plate 2 are respectively disposed at both ends of the heat exchange tube system 3;

[0029] A heat exchange space 10 is formed between the front end plate 1 and the rear end plate 2. Multiple heat exchange fins 4 are arranged parallel to the end plate in the heat exchange space 10 at intervals. A heat exchange airflow channel 40 is formed between two adjacent heat exchange fins 4.

[0030] The heat exchange space 10 has a side perpendicular to the front end plate 1, the rear end plate 2, the upper end face, and the lower end face as the main air inlet. The heat exchange air enters the heat exchange air flow channel 40 through the main air inlet. The upper end face and / or the lower end face of the heat exchange space 10 are provided with the air regulating device 5. The air regulating device 5 is provided with an auxiliary air regulating device vent. The air regulating device 5 can adjust the opening and closing degree of the auxiliary air regulating device vent to regulate the flow rate of the heat exchange air entering the heat exchange space.

[0031] Specifically, in this embodiment, the heat exchange tube system 3 adopts a tube-fin heat exchanger, including a gas collecting pipe 30, a heat exchange tube 31, a U-shaped elbow 32, and a liquid collecting pipe 33.

[0032] The liquid collecting pipe 33 is located on the air inlet side near the tube-fin heat exchanger, and the gas collecting pipe 30 is located on the air outlet side near the tube-fin heat exchanger, enabling counter-current heat exchange and improving heat exchange efficiency. The gas collecting pipe 30 and the liquid collecting pipe 33 are connected by the heat exchange pipe 31 and the U-shaped bend 32. Preferably, multiple heat exchange pipes 31 are arranged between the gas collecting pipe 30 and the liquid collecting pipe 33 along the air inlet direction. The heat exchange pipes 31 are U-shaped or straight pipes, as shown in the figure, and have flow channels for the heat exchanger. The multiple heat exchange pipes 31 are arranged parallel to each other and connected end-to-end by the U-shaped bend 32 to form a heat exchange pipe group. The beginning and end of each heat exchange pipe group are connected to the liquid collecting pipe 33 and the gas collecting pipe 30, respectively, with the liquid collecting pipe 33 and the gas collecting pipe 30 located at the front end. The outer side of plate 1 or rear plate 2 and the liquid collection pipe 33 are located near the air inlet side of the tube-fin heat exchanger, and the air collection pipe 30 is located near the air outlet side of the tube-fin heat exchanger. Each group of heat exchange tubes is arranged in a straight line perpendicular to the air inlet direction. Preferably, n rows of heat exchange tubes are arranged sequentially along the direction from one end of the main air inlet to one end of the main air outlet in the heat exchange system; wherein, n≥4, the heat exchange tubes in each row are parallel to each other, and each row of heat exchange tubes is arranged in a straight line perpendicular to the air inlet direction to further improve the heat exchange efficiency.

[0033] Heat exchange tube holes are provided on the front end plate 1, rear end plate 2, and heat exchange fins 4. Heat exchange tubes 31 can pass through these holes and are fixed to the front end plate 1, rear end plate 2, and heat exchange fins 4. The front end plate 1 and rear end plate 2 are respectively fixedly installed at both ends of the heat exchange tubes 31. Multiple heat exchange fins 4, parallel to the end plates, are evenly distributed between the front and rear end plates. A heat exchange airflow channel is formed between two adjacent heat exchange fins 4, meaning the heat exchange fins 4 are arranged parallel to the air inlet direction. In this embodiment, a tube-fin heat exchanger is used. Since the heat exchange fins are connected to the heat exchange tubes, the heat exchange area can be increased through the heat exchange fins, thereby improving heat exchange efficiency. The heat exchange medium flowing inside the heat exchange tubes can be a refrigerant or a heat exchanger. Refrigerants include liquid refrigerant and chilled water, while heat exchangers include gaseous refrigerant and hot water. Air typically flows from one side of the heat exchanger to the other, exchanging heat with the heat exchange fins and heat exchange tubes during its flow through the heat exchanger, thus achieving heat exchange. Typically, a heat exchanger contains several heat exchange fins arranged sequentially and at intervals along the extension direction of the heat exchange tubes. Airflow channels are formed between adjacent fins, allowing air to flow from one side of the heat exchanger to the other. Refrigerant enters the gas collecting pipe 7 directly from the compressor discharge pipe through the expansion valve. After evaporation and heat exchange via multiple U-shaped pipes 4 and U-shaped bends 5 (after being heated by the air), it enters the liquid collecting pipe 6, and then flows through the compressor suction pipe into the air conditioning unit's dryer filter.

[0034] In the heat exchange system, n rows of heat exchange tubes are arranged sequentially from one end of the main air inlet to one end of the main air outlet. Figure 2 The dashed line in the middle represents a row of heat exchange tubes; where n≥4, and the rows of heat exchange tubes are parallel to each other.

[0035] In the embodiments of this application, the airflow direction of the heat exchange fins corresponds to the airflow direction. "Upstream" and "downstream" refer to the upstream and downstream relationship in the airflow direction.

[0036] Air conditioning devices 5 are provided at the upper and lower ends of the front end plate 1 and the rear end plate 2. The air conditioning devices 5 are provided with auxiliary ventilation openings. The air conditioning devices 5 can adjust the opening and closing degree of the auxiliary ventilation openings to regulate the flow rate of the heat exchange air entering the heat exchange space.

[0037] Specifically, in this embodiment, the air regulating device 5 includes a stationary air regulating device 50 and a moving air regulating device 51;

[0038] In this embodiment, the air regulating device is described using an example where both ends are equipped with air regulating devices. The two ends of the stationary plate 50 of the air regulating device are fixedly connected to the upper and lower ends of the front end plate 1 and the rear end plate 2, respectively. The stationary plate 50 is provided with at least one stationary plate vent 52, and the moving plate 51 is provided with at least one moving plate vent 53. In this embodiment, the stationary plate vent 52 and the moving plate vent 53 are elongated openings respectively on the stationary plate 50 and the moving plate 51 of the air regulating device. The moving plate 51 is installed on the stationary plate 50 of the air regulating device. The movable plate 51 of the air regulating device is able to move horizontally relative to the stationary plate 50 of the air regulating device. When the movable plate 51 of the air regulating device moves horizontally relative to the stationary plate 50 of the air regulating device, the overlapping area of ​​the vent 52 of the stationary plate and the vent 53 of the movable plate changes to adjust the opening degree of the vent. That is, when the movable plate 51 of the air regulating device moves horizontally relative to the stationary plate 50 of the air regulating device, the vent 52 of the stationary plate and the vent 53 of the movable plate can completely overlap, partially overlap or be completely blocked, thereby adjusting the opening degree of the vent at the upper and lower end faces.

[0039] The tube-fin heat exchanger for rail air conditioning disclosed in this invention has an air regulating device 5 on the upper and / or lower end face of the heat exchange space 10. The air regulating device 5 has an auxiliary ventilation port, which can adjust the opening and closing degree of the auxiliary ventilation port to regulate the flow rate of the heat exchange air entering the heat exchange space. Therefore, as... Figure 1 As shown, the following explanation uses the example of a fan drawing heat exchange air into a tube-fin heat exchanger for heat exchange. When this heat exchanger is used in summer cooling conditions, to increase the heat exchange efficiency of the outdoor heat exchanger, during the refrigerant heat dissipation process, the heat exchange air enters from one side of the heat exchanger, passes through the corrugated fins and U-shaped tubes, and flows out from the other side. Simultaneously, the opening of the auxiliary vent of the air regulating device can be adjusted to increase the airflow, allowing some heat exchange air to enter the heat exchange space from the upper and lower ends of the outdoor heat exchanger. The arrows in the diagram indicate the flow direction of the heat exchange air. By increasing the area of ​​the vents and changing the airflow direction, the resistance of the heat exchange air flowing through the corrugated fins can be minimized, increasing the airflow and enhancing the heat exchange effect. In other words, by setting up the air regulating device, the airflow entering the heat exchange space is increased, while the resistance between the heat exchange air and the heat exchange fins is reduced, thereby enhancing the heat exchange effect. However, when using the tube-fin heat exchanger of this track air conditioner for outdoor heat exchange in winter, as... Figure 3As shown, by adjusting the airflow regulating device—specifically by closing or reducing the opening of the upper and lower air inlets—the heat exchange air can only enter the heat exchange space from the side of the heat exchanger. This increases the resistance of the airflow through the heat exchange fins and simultaneously increases the air velocity entering the corrugated fins, minimizing frost formation and thus improving the heat exchange efficiency in winter conditions. Furthermore, the addition of upper and lower cover plates in this application guides the airflow entering the heat exchanger to flow from one side along the fin direction and out the other side, ensuring that there is no "short-circuiting" of the airflow. This also minimizes the number of sheet metal parts along the airflow direction, reducing local resistance loss, increasing airflow, and enhancing the heat exchange effect.

[0040] In summer operating conditions, the tube-fin heat exchanger applicable to the rail air conditioning system in this embodiment is a single-cooling heat exchanger, including a front end plate 1, a rear end plate 2, a heat exchange tube system 3, and heat exchange fins 4, as shown below. Figure 2 As shown, in the heat exchange system, n rows of heat exchange tubes are arranged sequentially from one end of the main air inlet to one end of the main air outlet; wherein, n≥4, and the rows of heat exchange tubes are parallel to each other, which can further improve the heat exchange efficiency.

[0041] In winter operation, by changing the air intake of the upper air regulating device 8 and the lower air regulating device 9, the airflow through the fins is increased, thereby controlling frost formation on the fins.

[0042] According to the first law of thermodynamics, Q = CMΔT;

[0043] Where Q is the process heat dissipation, C is the specific heat capacity of air, M is the air flow rate, and ΔT is the temperature difference between the air entering and exiting the heat exchanger. The factors affecting the heat exchange capacity are the specific heat of air, the air flow rate, and the heat exchange temperature difference.

[0044] According to the fluid continuity equation q=au,

[0045] Where q is the flow rate, u is the velocity, and a is the cross-sectional area in the direction of fluid flow;

[0046] Based on the fluid local resistance relationship

[0047] Where hj is the drag loss, ξ is the drag coefficient, v is the velocity, and g is the gravitational acceleration.

[0048] It can be concluded that there is a positive correlation between air volume and resistance coefficient. That is, the greater the resistance, the greater the air volume of the heat exchanger, and thus the greater the impact on the heat exchange effect.

[0049] The experimental data for this embodiment are as follows:

[0050] Table 1 shows the frosting conditions of heat pumps in winter:

[0051] Table 1 Comparison of different structures with the same air volume under winter operating conditions

[0052] <![CDATA[Air volume (m 3 / hr)]]> 3500 3500 3500 Frost area 50 41 39

[0053] As can be seen from Table 1, heat exchangers with air-adjusting structures can significantly reduce the frosting area in winter heat pump operation when the air-adjusting plates do not overlap, thereby improving the heat exchanger's heat exchange performance.

[0054] Tables 2 and 3 show the analysis of whether or not there is an air conditioning device during summer operation:

[0055] Table 2. Impact of different structural forms on performance under the same outdoor ambient temperature and air volume.

[0056]

[0057] The experimental data on the misalignment of the heat exchanger air regulating plates are as follows:

[0058] Table 3. Effect of different air volumes on performance at the same outdoor ambient temperature

[0059]

[0060] The situation described in the table above, where the heat exchanger air regulating plates do not overlap, is the same as the conventional design in the prior art where end plates are set on the upper and lower ends of the heat exchanger. As can be seen from the experimental data in Tables 1-3, although the conventional design (i.e., the situation where the heat exchanger air regulating plates do not overlap) can effectively reduce the frost area of ​​the heat exchanger in winter, the indoor performance coefficient is low in summer. Therefore, the indoor performance coefficient needs to be improved by increasing the air volume.

[0061] However, this embodiment adjusts the overlap of the air regulating plates by adjusting the air regulating device, which not only achieves the state of non-overlapping air regulating plates in winter to reduce the frost area of ​​the heat exchanger, but also gradually adjusts the overlap of the air regulating plates according to the rise in ambient temperature, so that the indoor performance coefficient is always kept in the optimal state, which greatly reduces energy waste and carbon emissions.

[0062] When the outdoor temperature is too high or the heat exchanger is a single-cooling type, the air regulating device's air regulating plate is 100% overlapped, and its performance is similar to that without an air regulating device. The structure of the air regulating device without an air regulating device is as follows: Figure 2 As shown, in the heat exchange system, n rows of heat exchange tubes are arranged sequentially from the main air inlet to the main air outlet; where n ≥ 4, and the rows of heat exchange tubes are parallel to each other. As can be seen from the data in Table 2, the indoor performance coefficient is close to optimal under this structural configuration. Therefore, the heat exchanger structure with air conditioning in this embodiment can achieve a highly efficient heat exchange state under all operating conditions in winter and summer, reducing energy loss and making operation more convenient.

[0063] Furthermore, the stationary plate 50 or the moving plate 51 of the air regulating device is provided with a slide rail 54, and the stationary plate 50 and the moving plate 51 of the air regulating device are slidably connected through the slide rail 54. In this embodiment, the two sides of the stationary plate 50 of the air regulating device are provided with a slide rail 54 structure, and the two sides of the moving plate 51 of the air regulating device are inserted into the slide rail 54. The moving plate of the air regulating device can be pushed and pulled to realize the sliding of the moving plate of the air regulating device on the stationary plate of the air regulating device. Through the slide rail structure, it has the advantages of simple structure and convenient operation.

[0064] Furthermore, the axial flow fan is positioned on one side of the tube-fin heat exchanger, making the tube-fin heat exchanger a counter-flow structure. Specifically, under the action of the axial flow fan, the air blown out by the axial flow fan enters the first row of heat exchange tubes (U-shaped tubes) of the outdoor heat exchanger. The air that has absorbed heat passes through the corrugated fins 8, and by reducing the airflow channels, the phenomenon of frost formation on the fins is delayed. The tube-fin heat exchanger for track air conditioning disclosed in this invention can be used for heat exchange in both indoor and outdoor heat exchangers of air conditioning heat pump systems and single-cooling track air conditioning units.

[0065] Furthermore, the heat exchange fin 4 is a corrugated fin, which further improves the heat exchange efficiency.

[0066] Furthermore, the upper and lower ends of the heat exchange fins 4 are respectively fixedly connected to the static plates 50 of the air regulating device located at the upper and lower ends. This application, by employing an upper and lower air regulating device, can completely cover the top and bottom surfaces of the heat exchange fins, thereby protecting the fins and preventing bending and deformation that would affect the heat exchange effect. Simultaneously, through the misalignment adjustment of the moving and static plates of the air regulating device, a stepless adjustment function for the airflow entering the heat exchanger can be achieved. Based on the required heat exchange conditions, the required airflow entering the heat exchanger can be adjusted, thereby reducing the occurrence of frost formation on the heat exchanger in winter.

[0067] Furthermore, the front end plate 1 and the rear end plate 2 are provided with a support plate 11 on the side away from the heat exchange fins 4, for supporting and fixing the entire heat exchanger.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tube-fin heat exchanger suitable for rail air conditioning, characterized in that: It includes the front-end plate, the rear-end plate, the heat exchange tube system, the heat exchange fins, and the air conditioning device; The front end plate and the rear end plate are respectively disposed at both ends of the heat exchange tube system; A heat exchange space is formed between the front end plate and the rear end plate. Multiple heat exchange fins are arranged at intervals in the heat exchange space, parallel to the end plate. A heat exchange airflow channel is formed between two adjacent heat exchange fins. The heat exchange space has a side that is perpendicular to the front end plate, the rear end plate, the upper end face, and the lower end face as the main air inlet, and the heat exchange air enters the heat exchange air flow channel through the main air inlet. The upper and / or lower surfaces of the heat exchange space are provided with the air regulating device, and the air regulating device is provided with an auxiliary air regulating port. The air regulating device can adjust the opening and closing degree of the auxiliary air regulating port to regulate the flow rate of the heat exchange air entering the heat exchange space.

2. The tube-fin heat exchanger for rail air conditioning according to claim 1, characterized in that: The air regulating device includes a stationary plate and a movable plate. The stationary plate of the air regulating device is fixedly connected to the front end plate and the rear end plate at both ends. The stationary plate of the air regulating device is provided with at least one stationary plate vent, and the moving plate of the air regulating device is provided with at least one moving plate vent. The moving plate of the air regulating device can move horizontally relative to the stationary plate of the air regulating device. When the moving plate of the air regulating device moves horizontally relative to the stationary plate of the air regulating device, the overlapping area of ​​the stationary plate vent and the moving plate vent changes to adjust the opening and closing degree of the auxiliary vent of the air regulating device.

3. The tube-fin heat exchanger for rail air conditioning according to claim 2, characterized in that: The stationary plate or the moving plate of the air regulating device is provided with a slide rail, and the stationary plate and the moving plate of the air regulating device are connected by the slide rail.

4. The tube-fin heat exchanger suitable for rail air conditioning according to any one of claims 1 to 3, characterized in that: An axial flow fan is positioned on one side of the tube-fin heat exchanger, making the tube-fin heat exchanger a counter-flow structure.

5. The tube-fin heat exchanger suitable for rail air conditioning according to claim 4, characterized in that: The heat exchange tube system includes a gas collecting pipe, heat exchange tubes, a U-shaped elbow, and a liquid collecting pipe; The liquid collecting pipe is located on the air inlet side near the tube-fin heat exchanger, and the gas collecting pipe is located on the air outlet side near the tube-fin heat exchanger. The gas collecting pipe and the liquid collecting pipe are connected by the heat exchange pipe and the U-shaped elbow.

6. The tube-fin heat exchanger for rail air conditioning according to claim 5, characterized in that: The upper and lower ends of the heat exchange fins are fixedly connected to the static plates of the air regulating device located at the upper and lower ends, respectively.

7. The tube-fin heat exchanger for rail air conditioning according to claim 6, characterized in that: The heat exchange fins are corrugated fins.

8. The tube-fin heat exchanger for rail air conditioning according to claim 7, characterized in that: In the heat exchange system, n rows of heat exchange tubes are arranged sequentially from one end of the main air inlet to one end of the main air outlet; wherein, n≥4, and the rows of heat exchange tubes are parallel to each other.

9. The tube-fin heat exchanger for rail air conditioning according to claim 8, characterized in that: The heat exchange tube is a U-shaped tube.

10. The tube-fin heat exchanger for rail air conditioning according to claim 9, characterized in that: The front end plate and the rear end plate are also provided with a support plate on the side away from the heat exchange fins.

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