Cab air conditioning system and rail transit vehicle

Abstract

The utility model discloses a cab air conditioning system and a rail transit vehicle, the air conditioning system comprises a first heat exchanger and a second heat exchanger, each of the first heat exchanger and the second heat exchanger comprises at least two groups of independent heat exchange channels, and the first group of heat exchange channels on the first heat exchanger and the first group of heat exchange channels on the second heat exchanger are sequentially communicated end to end; the first set of heat exchange channels on the first heat exchanger and the second set of heat exchange channels on the second heat exchanger are sequentially communicated in an end-to-end mode to form a first refrigerating loop, and the first refrigerating loop and the second refrigerating loop are each provided with a compressor and a throttling device. Refrigerant in the first refrigerating circuit and the second refrigerating circuit flows to the second heat exchanger from the compressor, flows to the first heat exchanger through the throttling device after flowing out of the second heat exchanger, and flows to the compressor after flowing out of the first heat exchanger. According to the air conditioning system, half-cooling-capacity operation of the air conditioning system can be achieved, the refrigeration redundancy function is achieved, and the reliability of the system is improved.

Description

Technical Field

[0001] This application relates to the field of rail transit air conditioning technology, and in particular to a driver's cab air conditioning system and a rail transit vehicle. Background Technology

[0002] To improve the comfort of the driver's cab of rail transit vehicles (also known as the locomotive driver's cab), a dedicated air conditioning unit is usually installed in the driver's cab to maintain the temperature inside the cab within a range that is comfortable for the human body.

[0003] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art:

[0004] Because existing driver's cab air conditioning units typically use a single refrigeration system design, this system cannot achieve half-capacity operation or refrigeration redundancy. When a small amount of cooling is needed, it can only operate at full power, wasting energy. On the other hand, if the single refrigeration system fails, the entire unit will be unable to cool, affecting the working conditions of the driver's cab staff. Utility Model Content

[0005] The purpose of this application is to provide a driver's cab air conditioning system and rail transit vehicle, which can realize the driver's cab air conditioning system to operate at half cooling capacity and also has a cooling redundancy function, thereby improving the reliability of the system.

[0006] To achieve the above objectives, this application provides a driver's cab air conditioning system, including a first heat exchanger and a second heat exchanger. Both the first and second heat exchangers include at least two sets of independent heat exchange channels. The first set of heat exchange channels on the first heat exchanger and the first set of heat exchange channels on the second heat exchanger are connected end-to-end to form a first refrigeration circuit. The second set of heat exchange channels on the first heat exchanger and the second set of heat exchange channels on the second heat exchanger are connected end-to-end to form a second refrigeration circuit. Both the first and second refrigeration circuits are equipped with a compressor and a throttling device. The refrigerant in the first and second refrigeration circuits flows from the compressor to the second heat exchanger, flows out of the second heat exchanger and through the throttling device to the first heat exchanger, and flows out of the first heat exchanger and back to the compressor.

[0007] Optionally, the first heat exchanger includes a plurality of evaporating coils, which are distributed along a direction perpendicular to the air inlet of the first heat exchanger. Adjacent evaporating coils are respectively used as two sets of heat exchange channels of the first heat exchanger, so that the evaporating coils in the two sets of heat exchange channels are alternately distributed.

[0008] Optionally, the second heat exchanger includes a plurality of condensing coils, which are distributed along a direction perpendicular to the air inlet of the second heat exchanger. Adjacent condensing coils are respectively used as two sets of heat exchange channels of the second heat exchanger, so that the condensing coils in the two sets of heat exchange channels are alternately distributed.

[0009] Optionally, the fluid inlet of the evaporator coil is located on the air outlet side of the first heat exchanger, and the fluid outlet of the evaporator coil is located on the air inlet side of the first heat exchanger.

[0010] The fluid inlet of the condenser coil is located on the air outlet side of the second heat exchanger, and the fluid outlet of the condenser coil is located on the air inlet side of the second heat exchanger.

[0011] Optionally, multiple evaporator coils or multiple condenser coils in the same group of heat exchange channels are arranged in parallel.

[0012] Optionally, the plurality of evaporator coils are distributed vertically, and two independent subcooling pipes are provided below the lowest evaporator coil, with each subcooling pipe connected to the first refrigeration circuit and the second refrigeration circuit respectively.

[0013] Optionally, the first heat exchanger further includes an evaporating fan corresponding to the evaporating coil, the evaporating fan being used to supply air to the room, and a heater being provided in the air path of the evaporating fan;

[0014] The heater is located in the air duct between the evaporator coil and the evaporator fan, so that indoor air passes through the evaporator coil, the heater and the evaporator fan in sequence before being sent back into the room.

[0015] Optionally, the heater includes at least two sets of heating circuits, and each set of heating circuits operates independently of the others;

[0016] The compressor is located in the air duct between the condenser coil and the condenser fan, so that outdoor air passes through the condenser coil, the compressor and the condenser fan in sequence before being sent to the outside again.

[0017] Optionally, the second heat exchanger further includes a condenser fan corresponding to the condenser coil, and the compressor is disposed in the air duct of the condenser fan.

[0018] Optionally, both the first refrigeration circuit and the second refrigeration circuit are equipped with a dryer filter and a gas-liquid separator. After the refrigerant flows out of the second heat exchanger, it flows through the dryer filter to the throttling device. After the refrigerant flows out of the first heat exchanger, it flows through the gas-liquid separator to the compressor.

[0019] A rail transit vehicle includes the driver's cab air conditioning system described above.

[0020] Compared with the prior art, the technical solution provided in this application has at least the following beneficial effects:

[0021] The driver's cab air conditioning system of this application has at least two refrigeration circuits, which share a first heat exchanger and a second heat exchanger. Each refrigeration circuit has a relatively independent heat exchange channel within the first and second heat exchangers, allowing for independent operation of the two circuits. When a small amount of cooling is required, only one refrigeration circuit needs to be activated, saving energy. It also features refrigeration redundancy; if one refrigeration circuit fails, the other circuits can still operate normally, improving system reliability. Furthermore, the first and second heat exchangers for multiple refrigeration circuits are integrated into a single unit, making it suitable for space-constrained locations such as driver's cabs, reducing system cost and space requirements. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the driver's cab air conditioning system provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the arrangement of multiple evaporator coils in the first heat exchanger provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the arrangement of multiple condenser coils in the second heat exchanger provided in the embodiments of this application;

[0026] Figure 4 This is a front view of the driver's cab air conditioning system provided in an embodiment of this application.

[0027] Figure 5 This is a side sectional view of the driver's cab air conditioning system provided in an embodiment of this application;

[0028] Figure 6 This is a three-dimensional structural diagram of the driver's cab air conditioning system provided in an embodiment of this application;

[0029] Figure 7 This is a bottom view of the driver's cab air conditioning system provided in an embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the rear of the driver's cab air conditioning system provided in an embodiment of this application.

[0031] In the diagram: 1-Second heat exchanger; 2-Compressor; 3-Condenser fan; 4-Dryer filter; 5-Gas-liquid separator; 6-Throttling device; 7-First heat exchanger; 8-Subcooling pipe; 9-Heater; 10-Evaporator fan; 11-First refrigeration circuit; 12-Second refrigeration circuit; 13-Evaporator coil; 14-Condenser coil; 15-Casing; 16-Air outlet; 17-Baffle plate; 18-Electrical control system; 19-Air inlet; 20-Electrical control chamber; 21-Water collection tray; 22-Return air outlet; 23-First maintenance port; 24-Air supply outlet; 25-Air outlet; 26-Drain pipe; 27-Drain outlet; 28-Second maintenance port; 29-Third maintenance port. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does 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, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Please refer to Figure 1This embodiment provides a driver's cab air conditioning system, which can be used to regulate the air temperature in the driver's cab of a rail transit vehicle. The driver's cab air conditioning system includes a first heat exchanger 7 and a second heat exchanger 1. The first heat exchanger 7 includes at least two sets of independent heat exchange channels, and the second heat exchanger 1 also includes at least two sets of independent heat exchange channels. Here, "independent" means that the refrigerants in the two sets of heat exchange channels do not interact. The first set of heat exchange channels on the first heat exchanger 7 and the first set of heat exchange channels on the second heat exchanger 1 are connected end to end to form a first refrigeration circuit 11. The refrigerant circulates in the first refrigeration circuit 11. The first end of the heat exchange channel is defined as the fluid inlet end, and the last end is defined as the fluid outlet end. Similarly, the second set of heat exchange channels on the first heat exchanger 7 and the second set of heat exchange channels on the second heat exchanger 1 are connected end to end to form a second refrigeration circuit 12.

[0036] To form a complete air conditioning refrigeration system, components such as a compressor 2, a throttling device 6, a dryer filter 4, and a gas-liquid separator 5 are installed in both the first refrigeration circuit 11 and the second refrigeration circuit 12. Please refer to [the relevant documentation] for details. Figure 1 For the first refrigeration circuit 11 and the second refrigeration circuit 12, the refrigerant inside is powered by the compressor 2. The refrigerant flows from the compressor 2 to the second heat exchanger 1, and after exiting the second heat exchanger 1, it flows through the throttling device 6 to the first heat exchanger 7. After exiting the first heat exchanger 7, the refrigerant flows back to the compressor 2, thus forming a refrigeration circuit in which the refrigerant circulates. In addition, after exiting the second heat exchanger 1, the refrigerant flows through the dryer filter 4 to the throttling device 6. The dryer filter 4 can absorb residual moisture in the refrigerant to prevent ice blockage caused by low-temperature freezing, and can also filter impurities to prevent blockage of the throttling device 6. After exiting the first heat exchanger 7, the refrigerant flows through the gas-liquid separator 5 to the compressor 2, which can prevent liquid refrigerant from entering the compressor 2, ensuring the stability and service life of the driver's cab air conditioning system.

[0037] When there are more than two sets of heat exchange channels on the first heat exchanger 7 and the second heat exchanger 1, more than two refrigeration circuits can be formed. That is, the heat exchange channels on the first heat exchanger 7 correspond one-to-one with the heat exchange channels on the second heat exchanger 1 and are connected end to end in sequence to form multiple refrigeration circuits. Each refrigeration circuit is equipped with components such as a compressor 2, a throttling device 6, a dryer filter 4, and a gas-liquid separator 5.

[0038] In summary, the driver's cab air conditioning system of this application has at least two refrigeration circuits, which share a first heat exchanger 7 and a second heat exchanger 1. Alternatively, each refrigeration circuit shares both heat exchangers 7 and 1. Each of the two or more refrigeration circuits has a relatively independent heat exchange channel within the first heat exchanger 7 and the second heat exchanger 1, enabling independent operation of the two or more refrigeration circuits. When a small amount of cooling is required, only one refrigeration circuit needs to be activated, saving energy. It also has refrigeration redundancy; if one refrigeration circuit fails, the other circuits can still operate normally, improving system reliability. Furthermore, the first heat exchangers 7 and second heat exchangers 1 on multiple refrigeration circuits are integrated into one unit, making it suitable for spaces with limited capacity, such as driver's cabs, reducing system cost and space occupation.

[0039] In some embodiments, the first heat exchanger 7 is an evaporator, which includes a plurality of evaporation coils 13. Please refer to... Figure 2 Multiple evaporator coils 13 are distributed perpendicular to the air inlet direction of the first heat exchanger 7, which reduces the flow resistance of air flowing through the evaporator coils 13 and improves heat transfer efficiency. In the first heat exchanger 7, each heat exchange channel can be composed of multiple evaporator coils 13, and the evaporator coils 13 in the two heat exchange channels are alternately distributed. That is, in the first heat exchanger 7, two adjacent evaporator coils 13 are used as two heat exchange channels of the first heat exchanger 7, thus forming two sets of alternately distributed heat exchange channels. Multiple evaporator coils 13 can be arranged in parallel so that multiple evaporator coils 13 in the same heat exchange channel form a whole and are connected to the refrigeration circuit; similarly, multiple condenser coils 14 in the same heat exchange channel can also be arranged in parallel so that they are connected as a whole to the refrigeration circuit.

[0040] Based on the above embodiments, the two sets of heat exchange channels are alternately distributed in the first heat exchanger 7, which can ensure the uniformity of air volume in the two sets of heat exchange channels, so that each refrigeration circuit can obtain a more uniform heat transfer efficiency, and even when a single refrigeration circuit is running, it can better provide uniform cooling for the room.

[0041] In some embodiments, the second heat exchanger 1 is a condenser, which includes a plurality of condensing coils 14. Please refer to... Figure 3 Similar to the arrangement of the evaporator coil 13, multiple condenser coils 14 are also distributed along the air inlet direction of the second heat exchanger 1. Adjacent condenser coils 14 serve as two sets of heat exchange channels for the second heat exchanger 1, thereby alternating the distribution of condenser coils 14 in the two sets of heat exchange channels. Through the above arrangement, the uniformity of airflow in the second heat exchanger 1 can be ensured, enabling each refrigeration circuit to obtain a relatively uniform heat transfer efficiency. Even when a single refrigeration circuit is running, it can better exchange heat evenly with the outdoor environment, ensuring the heat dissipation effect of the refrigerant.

[0042] The first heat exchanger 7 in this application is placed vertically, please refer to... Figure 2 Multiple evaporator coils 13 are distributed vertically, and two independent subcooling pipes 8 are set below the lowest evaporator coil 13. Each subcooling pipe 8 is connected to the first refrigeration circuit 11 and the second refrigeration circuit 12 respectively. Specifically, the subcooling pipe 8 is installed after the dryer filter 4 and before the throttling device 6 in the refrigeration circuit, so as to use the condensate generated by the driver's cab air conditioning system and the cold energy that is difficult to use at the bottom to subcool the high-pressure refrigerant liquid from the second heat exchanger 1, thereby increasing the unit cooling capacity of the refrigerant after throttling. At the same time, it condenses the flash gas in the liquid pipe from the second heat exchanger 1 into liquid refrigerant, thereby increasing the amount of refrigerant liquid.

[0043] In full-capacity operation, multiple refrigeration circuits work simultaneously. Low-temperature, low-pressure refrigerant gas is compressed by compressor 2 into high-temperature, high-pressure refrigerant gas. It then passes through the second heat exchanger 1, where it is condensed into high-pressure refrigerant liquid. After passing through the dryer filter 4, it enters the subcooling pipe 8 for subcooling before throttling. The refrigerant is subcooled from high-pressure liquid at room temperature to high-pressure liquid at a relatively low temperature. The refrigerant then passes through the throttling device 6, becoming low-temperature, low-pressure refrigerant liquid. It then absorbs heat in the first heat exchanger 7, becoming low-temperature, low-pressure refrigerant gas. After passing through the gas-liquid separator 5, it returns to compressor 2 for compression, thus completing one cycle. In half-capacity operation, either of the two refrigeration circuits can be used. When a single refrigeration circuit is running, regardless of which circuit is operating, the refrigerant flow rate and air volume can be evenly distributed in the first heat exchanger 7 and the second heat exchanger 1, ensuring that the indoor space quickly reaches or stably maintains the set temperature.

[0044] In addition, the first heat exchanger 7 also includes an evaporator fan 10 corresponding to the evaporator coil 13. The evaporator fan 10 is used to supply air to the room, and a heater 9 is provided in the air path of the evaporator fan 10. Specifically, the heater 9 is located in the air path between the evaporator coil 13 and the evaporator fan 10. Please refer to [reference needed]. Figure 1 The airflow direction at the first heat exchanger 7 is: indoor - first heat exchanger 7 - heater 9 - evaporator fan 10 - indoor; the heater 9 includes at least two sets of heating circuits, each of which operates independently. During heating operation, the heater 9 heats, and the two heating circuits can achieve full-power heating and half-power heating, thus achieving heating redundancy. That is, even if one heating circuit fails, the other heating circuit can continue to operate, so that the entire unit does not lose its heating capacity.

[0045] The second heat exchanger 1 of this application also includes a condenser fan 3 corresponding to the condenser coil 14. A compressor 2 is disposed in the airflow path of the condenser fan 3. Specifically, the compressor 2 is disposed in the airflow path between the condenser coil 14 and the condenser fan 3. Please refer to [reference needed]. Figure 1The airflow direction at the second heat exchanger 1 is: outdoor - second heat exchanger 1 - compressor 2 - condenser fan 3 - outdoor. While satisfying the condensation effect, it can also dissipate heat for compressor 2. It can be seen that the two refrigeration circuits of this application also share the condenser fan 3 and the evaporator fan 10, which can further reduce system cost and space occupation.

[0046] The fluid inlet of evaporator coil 13 is located on the air outlet side of the first heat exchanger 7, and the fluid outlet of evaporator coil 13 is located on the air inlet side of the first heat exchanger 7. Please refer to [reference needed]. Figure 2 That is, the overall flow direction of the refrigerant in the first heat exchanger 7 is opposite to the flow direction of the airflow, which allows for sufficient heat exchange between the indoor air and the refrigerant, improving heat exchange efficiency. Similarly, please refer to... Figure 3 The condenser coil 14 of the second heat exchanger 1 can be arranged horizontally. The fluid inlet of the condenser coil 14 is located on the air outlet side of the second heat exchanger 1, and the fluid outlet of the condenser coil 14 is located on the air inlet side of the second heat exchanger 1. That is, the overall flow direction of the refrigerant in the second heat exchanger 1 is opposite to the flow direction of the airflow, which can also improve the heat exchange efficiency between the outdoor air and the refrigerant.

[0047] In some embodiments, the driver's cab air conditioning system further includes a housing 15, please refer to Figure 4 The casing 15 includes an evaporator chamber and a condenser chamber, which can be distributed on the left and right sides of the casing 15, and the evaporator chamber and condenser chamber are relatively independent. The second heat exchanger 1, the compressor 2 and the condenser fan 33 are arranged sequentially in the condenser chamber along the first direction. The flow direction of the outdoor air in the condenser chamber is: second heat exchanger 1 - compressor 2 - condenser fan 3. Here, the compressor 2 includes the compressor 2 in each refrigeration circuit, so that the airflow of the condenser fan 3 can carry away the heat around the compressor 2 and discharge it outside the machine.

[0048] The first heat exchanger 7, the heater 9, and the evaporator fan 10 are arranged sequentially in the evaporation chamber along the second direction. The airflow of the evaporator fan 10 is used to discharge the cold energy around the first heat exchanger 7 or the heat energy around the heater 9 into the room.

[0049] The first and second directions are not subject to many restrictions and can be horizontal, vertical, or diagonal, etc. The key is to ensure that the corresponding components can be arranged in sequence in these two directions, so as to make full use of the airflow effect generated by the condenser fan 3 and the evaporator fan 10 to remove the cold or heat from the corresponding components.

[0050] Please refer to Figure 4 and Figure 6The condensing chamber has an air inlet 19 and an air outlet 25 at both ends in the first direction. Both the air inlet 19 and the air outlet 25 are located on the casing 15. The air inlet 19 corresponds to the second heat exchanger 1 in the first direction to ensure that the airflow can directly act on the second heat exchanger 1 and ensure the heat exchange efficiency between the second heat exchanger 1 and the airflow. The air outlet 25 corresponds to the air outlet end of the condensing fan 3 in the first direction to ensure that the airflow can be directly discharged from the casing 15 through the air outlet 25, avoiding the problem of poor heat dissipation of the second heat exchanger 1 and compressor 2 due to the inability of hot air in the condensing chamber to be discharged in time. Both the air inlet 19 and the air outlet 25 are located on the outdoor side of the unit. Outdoor air flows in the condensing chamber in the first direction under the action of the condensing fan 3, thereby carrying away the heat of the second heat exchanger 1 and compressor 2 in sequence, and is discharged to the outside through the air outlet 25.

[0051] Please refer to Figure 5 The evaporation chamber has a return air inlet 22 at one end in the second direction. The return air inlet 22 is opened on the casing 15 and corresponds to the first heat exchanger 7 in the second direction, so as to ensure that the airflow can directly remove the cold energy around the first heat exchanger 7. The evaporation chamber is also provided with an air outlet 24 corresponding to the air supply end of the evaporation fan 10. The air outlet 24 is opened on the casing 15, and both the return air inlet 22 and the air outlet 24 are located on the indoor side of the unit. The indoor air flows in the evaporation chamber in the second direction under the action of the evaporation fan 10, thereby successively removing the cold energy around the first heat exchanger 7 or the heat energy around the heater 9, and is discharged back into the room through the air outlet 24.

[0052] In some embodiments, the housing 15 is provided with a partition 17 that divides its interior into an evaporation chamber and a condensation chamber. Please refer to... Figure 4 Under the action of partition 17, the evaporator and condenser are divided into two independent chambers. However, since there are pipes that constitute the refrigeration circuit, the pipes need to be connected to corresponding components in the evaporator and condenser respectively. Therefore, the independence of the evaporator and condenser is not completely disconnected, but rather has a certain cavity area within the corresponding range.

[0053] Please refer to Figures 4 to 6 An air vent 16 is provided on the partition 17, connecting the evaporation chamber and the condensation chamber. The opening degree of the air vent 16 is adjustable, thereby controlling the air volume passing through the air vent 16. Outdoor fresh air can enter the condensation chamber through the air inlet 19. When the air vent 16 is open, part of the outdoor fresh air flows in the condensation chamber along the first direction, and the other part can enter the evaporation chamber through the air vent 16. After heat exchange in the evaporation chamber through the first heat exchanger 7, it is discharged into the room, thereby providing fresh outdoor air to the room. The air vent 16 can be a grille air vent, and the air volume can be controlled by controlling the opening degree of the grille; corresponding air valves can also be installed at the air vent 16 to achieve air volume control. These are not described in detail here, but all fall within the protection scope of this application.

[0054] It should be noted that the air vent 16 needs to be set in a preset area on the partition 17. This preset area corresponds to the area between the air inlet 19 and the second heat exchanger 1. That is, in the first direction, the air vent is located between the air inlet 19 and the second heat exchanger 1, ensuring that the outdoor fresh air entering the evaporation chamber through the air vent 16 does not exchange heat with the second heat exchanger 1. This is because if the outdoor fresh air exchanges heat with the second heat exchanger 1, it will carry a high amount of heat. After entering the evaporation chamber, it will affect the heat dissipation effect of some components in the evaporation chamber and increase the load on the first heat exchanger 7, thus affecting the normal operation of the driver's cab air conditioning system.

[0055] In some embodiments, the first direction is a vertical direction, that is, from the top of the housing 15 to the bottom of the housing 15. Based on this, the air inlet 19 is located at the top of the housing 15 and corresponds to the position of the condenser cavity, while the air outlet 25 is located at the bottom of the housing 15. Please refer to... Figure 4 and Figure 6 The second heat exchanger 1 is arranged horizontally above the condensing chamber. The compressors 2 in the multiple refrigeration circuits are located below the second heat exchanger 1 and distributed horizontally. The condenser fan 3 is located below the second heat exchanger 1 and below the compressors 2. Outdoor air can pass through the second heat exchanger 1 and the compressors 2 and be discharged to the outside through the condenser fan 3.

[0056] Among them, the compressors 2 can be diagonally distributed in the condensing chamber, which can make full use of the internal space of the condensing chamber. The spacing between the compressors 2 is larger, the airflow is smoother, and the efficiency of heat removal is higher.

[0057] In some embodiments, the second direction is the horizontal direction; please refer to... Figure 5 The return air vent 22 is located at the rear end of the casing 15 and directly opposite the first heat exchanger 7; the supply air vent 24 is located at the bottom end of the casing 15, meaning the condenser fan 3 can drive air to be supplied to the outside of the bottom of the casing 15. Please refer to [reference needed]. Figure 7 .

[0058] In addition, a water collection tray 21 is provided at the bottom of the evaporation chamber, please refer to... Figure 5 The first heat exchanger 7 is vertically arranged at the lower part of the evaporation chamber and located inside the water collection tray 21. The condensate produced by the first heat exchanger 7 can accumulate in the water collection tray 21 and be led out of the casing 15 through the drain pipe 26; specifically, please refer to Figure 4 A drain pipe 26 can be installed inside the casing 15, and the drain outlet 27 of the drain pipe 26 can be led to the air outlet 25 to complete the discharge of condensate.

[0059] The driver's cab air conditioning system also includes an electronic control system 18. An electronic control cavity 20 is provided in the evaporation cavity to accommodate the electronic control system 18. To facilitate manual operation or maintenance of the electronic control system 18, an electronic control door can be provided at the front end of the housing 15 corresponding to the electronic control cavity 20. At the same time, the electronic control cavity 20 is located on the upper part of the evaporation cavity and on the side close to the front end of the housing 15.

[0060] Considering the heat dissipation of the electronic control system 18, based on the above-mentioned arrangement of the air vent 16, the air vent 16 can also be located behind the electronic control cavity 20. After the outdoor fresh air enters the evaporation cavity through the air vent 16, it will form a mixed airflow with the indoor air in the evaporation cavity. This mixed airflow can carry away the heat of the electronic control system 18, thereby ensuring the heat dissipation effect of the electronic control system 18. The air vent 16 is located above the first heat exchanger 7. After the mixed air dissipates heat from the electronic control system 18, it can be discharged into the room after heat exchange through the first heat exchanger 7.

[0061] The dryer filter 4 and the gas-liquid separator 5 are installed in the evaporation chamber. The gas-liquid separator 5 is located above the first heat exchanger 7, and the electrical control chamber 20 is located above the gas-liquid separator 5. This makes full use of the space in the evaporation chamber, making the arrangement of each component more reasonable and the structure more compact.

[0062] Please refer to Figure 6 and Figure 8 A first maintenance port 23 can be provided on the side of the housing 15 for installing and maintaining the compressor 2, the second heat exchanger 1, and the air vent 16 on the partition 17 in the condenser chamber. A second maintenance port 28 is provided on the upper part of the back of the housing 15 for charging refrigerant and welding copper pipes. A third maintenance port 29 is provided on the back of the housing 15 at the position corresponding to the first heat exchanger 7 for installing and maintaining the first heat exchanger 7 and surrounding components. When the driver's cab air conditioning system is running normally, the three maintenance ports can be closed. When maintenance of the internal components of the housing 15 is required, the corresponding maintenance port can be opened.

[0063] This application also provides a rail transit vehicle, which includes a driver's cab and an air conditioning system installed on the driver's cab, the air conditioning system being the aforementioned driver's cab air conditioning system.

[0064] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0065] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A driver's cab air conditioning system, characterized in that, The system includes a first heat exchanger (7) and a second heat exchanger (1). Both the first heat exchanger (7) and the second heat exchanger (1) include at least two sets of independent heat exchange channels. The first set of heat exchange channels on the first heat exchanger (7) is connected end to end with the first set of heat exchange channels on the second heat exchanger (1) to form a first refrigeration circuit (11). The second set of heat exchange channels on the first heat exchanger (7) is connected end to end with the second set of heat exchange channels on the second heat exchanger (1) to form a second refrigeration circuit (12). Both the first refrigeration circuit (11) and the second refrigeration circuit (12) are equipped with a compressor (2) and a throttling device (6). The refrigerant in the first refrigeration circuit (11) and the second refrigeration circuit (12) flows from the compressor (2) to the second heat exchanger (1). After the refrigerant flows out of the second heat exchanger (1), it flows through the throttling device (6) to the first heat exchanger (7). After the refrigerant flows out of the first heat exchanger (7), it flows to the compressor (2).

2. The driver's cab air conditioning system according to claim 1, characterized in that, The first heat exchanger (7) includes a plurality of evaporator coils (13), the plurality of evaporator coils (13) are distributed along a direction perpendicular to the air inlet of the first heat exchanger (7), and adjacent evaporator coils (13) are respectively used as two sets of heat exchange channels of the first heat exchanger (7), so that the evaporator coils (13) in the two sets of heat exchange channels are alternately distributed.

3. The driver's cab air conditioning system according to claim 2, characterized in that, The second heat exchanger (1) includes a plurality of condensing coils (14), which are distributed along a direction perpendicular to the air inlet of the second heat exchanger (1). Adjacent condensing coils (14) are respectively used as two sets of heat exchange channels of the second heat exchanger (1), so that the condensing coils (14) in the two sets of heat exchange channels are alternately distributed.

4. The driver's cab air conditioning system according to claim 3, characterized in that, The fluid inlet of the evaporator coil (13) is located on the air outlet side of the first heat exchanger (7), and the fluid outlet of the evaporator coil (13) is located on the air inlet side of the first heat exchanger (7). The fluid inlet of the condenser coil (14) is located on the air outlet side of the second heat exchanger (1), and the fluid outlet of the condenser coil (14) is located on the air inlet side of the second heat exchanger (1).

5. The driver's cab air conditioning system according to claim 3, characterized in that, Multiple evaporator coils (13) or multiple condenser coils (14) in the same heat exchange channel are connected in parallel.

6. The driver's cab air conditioning system according to claim 2, characterized in that, Multiple evaporator coils (13) are distributed vertically, and two independent subcooling pipes (8) are provided below the lowest evaporator coil (13). Each subcooling pipe (8) is connected to the first refrigeration circuit (11) and the second refrigeration circuit (12) respectively.

7. The driver's cab air conditioning system according to claim 2, characterized in that, The first heat exchanger (7) also includes an evaporator fan (10) corresponding to the evaporator coil (13). The evaporator fan (10) is used to supply air to the room. A heater (9) is provided in the air path of the evaporator fan (10). The heater (9) includes at least two sets of heating circuits, and each set of heating circuits operates independently. The heater (9) is located in the air path between the evaporator coil (13) and the evaporator fan (10) so that the indoor air passes through the evaporator coil (13), the heater (9) and the evaporator fan (10) in sequence and is then sent back into the room.

8. The driver's cab air conditioning system according to claim 3, characterized in that, The second heat exchanger (1) also includes a condenser fan (3) corresponding to the condenser coil (14), and the compressor (2) is arranged in the air path of the condenser fan (3); The compressor (2) is located in the air path between the condenser coil (14) and the condenser fan (3) so that outdoor air passes through the condenser coil (14), the compressor (2) and the condenser fan (3) in sequence and is then sent to the outside again.

9. The driver's cab air conditioning system according to any one of claims 1-8, characterized in that, Both the first refrigeration circuit (11) and the second refrigeration circuit (12) are equipped with a dryer filter (4) and a gas-liquid separator (5). The refrigerant flows out of the second heat exchanger (1) and then flows through the dryer filter (4) to the throttling device (6). The refrigerant flows out of the first heat exchanger (7) and then flows through the gas-liquid separator (5) to the compressor (2).

10. A rail transit vehicle, characterized in that, Includes the driver's cab air conditioning system as described in any one of claims 1-9.

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