Cab air conditioning unit and rail transit vehicle

Abstract

The utility model discloses a cab air conditioning unit and a rail transit vehicle, and the air conditioning unit comprises a machine shell which comprises an evaporation cavity and a condensation cavity; the refrigerating system comprises at least two refrigerating circuits and further comprises an evaporator and a condenser which are arranged on the multiple refrigerating circuits, a compressor and a throttling device are arranged on each refrigerating circuit, a refrigerant flows to the condenser from the compressor, flows to the evaporator through the throttling device after flowing out of the condenser, and flows to the compressor after flowing out of the evaporator. The refrigerating system further comprises a condensation fan and an evaporation fan. The condenser, the compressor and the condensation fan are sequentially arranged in the condensation cavity in the first direction. The heating system comprises a heater, the heater comprises at least two sets of heating loops which operate independently, and the evaporator, the heater and the evaporation fan are sequentially arranged in the evaporation cavity in the second direction. According to the air conditioning unit, multi-gear temperature regulation and control of the air conditioning unit can be achieved in a limited space, the refrigerating and heating redundancy functions are further achieved, and the reliability of the unit 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 unit 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] Due to the limited space in the driver's cab, existing driver's cab air conditioning units typically use a single cooling system and a single heating system. A single cooling / heating system cannot achieve multi-level temperature control, and if a single cooling / heating system fails, the entire air conditioning system will be unable to cool / heat, affecting the driver's working condition. Utility Model Content

[0005] The purpose of this application is to provide a driver's cab air conditioning unit and rail transit vehicle, which can realize multi-level temperature control of the air conditioning unit in a limited space, and also has cooling redundancy function and heating redundancy function, thereby improving the reliability of the unit.

[0006] To achieve the above objectives, this application provides a driver's cab air conditioning unit, comprising:

[0007] The housing includes an evaporation chamber and a condensation chamber;

[0008] A refrigeration system includes at least two refrigeration circuits that can operate independently of each other, and also includes evaporators and condensers disposed on the multiple refrigeration circuits. Each refrigeration circuit is equipped with a compressor and a throttling device. The refrigerant in each refrigeration circuit flows from the compressor to the condenser, and after exiting the condenser, the refrigerant flows through the throttling device to the evaporator, and after exiting the evaporator, the refrigerant flows to the compressor. The refrigeration system also includes a condenser fan and an evaporator fan. The condenser, the compressor, and the condenser fan are sequentially arranged in the condensation chamber along a first direction.

[0009] A heating system includes a heater, the heater comprising at least two sets of heating circuits that can operate independently of each other, and the evaporator, the heater and the evaporation fan are arranged sequentially in the evaporation chamber along a second direction.

[0010] Optionally, the condensing chamber is provided with an air inlet and an air outlet at both ends in the first direction, the air inlet corresponding to the condenser in the first direction, the air outlet corresponding to the condensing fan in the first direction, and the air inlet and the air outlet located on the outdoor side.

[0011] Optionally, the evaporation chamber is provided with a return air inlet at one end in the second direction, the return air inlet corresponds to the evaporator in the second direction, and the evaporation chamber is provided with an air outlet corresponding to the air supply end of the evaporation fan, the return air inlet and the air supply outlet are located on the indoor side.

[0012] Optionally, the housing is provided with a partition that divides its interior into an evaporation chamber and a condensation chamber. The partition is provided with an air vent that connects the evaporation chamber and the condensation chamber. The air vent is located within a preset area of ​​the partition, which corresponds to the area between the air inlet and the condenser. The opening degree of the air vent is adjustable.

[0013] Optionally, the first direction is a vertical direction, the air inlet is located at the top of the housing, the air outlet is located at the bottom of the housing, the condenser is horizontally arranged in the upper part of the condensing chamber, and multiple compressors are distributed horizontally in the condensing chamber.

[0014] Optionally, the second direction is horizontal, the return air inlet is located at the rear end of the casing, the air outlet is located at the bottom end of the casing, a water collection tray is provided at the bottom of the evaporation chamber, the evaporator is vertically arranged in the lower part of the evaporation chamber and located in the water collection tray, and the condensate in the water collection tray is led to the outside of the casing through a drain pipe.

[0015] Optionally, it also includes an electronic control system, wherein the evaporation chamber is provided with an electronic control cavity for accommodating the electronic control system, the electronic control cavity is located in the upper part of the evaporation chamber and close to the front end of the casing, and the air outlet is located on the rear side of the electronic control cavity and above the evaporator.

[0016] Optionally, each of the refrigeration circuits is further provided with a dryer filter and a gas-liquid separator, the dryer filter and the gas-liquid separator are disposed in the evaporation chamber, the gas-liquid separator is located above the evaporator, and the electronic control chamber is located above the gas-liquid separator;

[0017] The refrigerant in each of the refrigeration circuits flows out from the condenser, through the dryer filter, and then to the throttling device. The refrigerant also flows out from the evaporator, through the gas-liquid separator, and then to the compressor.

[0018] Optionally, the evaporator is provided with several independent subcooling pipes on its lower side, and the subcooling pipes are respectively in each of the refrigeration circuits.

[0019] A rail transit vehicle includes the aforementioned driver's cab air conditioning unit.

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

[0021] This application allows multiple refrigeration circuits to share an evaporator and condenser. The refrigerant in each refrigeration circuit can exchange heat within both the evaporator and condenser, avoiding excessive space requirements due to additional refrigeration circuits. Simultaneously, the condenser, compressor, and condenser fan are arranged sequentially in the first direction, and the evaporator, heater, and evaporator fan are arranged sequentially in the second direction. This allows multiple refrigeration circuits to share the condenser fan and evaporator fan, and the refrigeration and heating systems to share the evaporator fan, significantly saving space and making it suitable for space-constrained locations such as driver's cabs. Furthermore, the two refrigeration circuits can operate independently; only one circuit needs to be activated when a small amount of cooling is required. Similarly, the heater in the heating system has two sets of heating circuits, each operating independently. One or both heating circuits can be activated depending on the situation. Therefore, it enables multi-level temperature control with a wider range, providing a more comfortable experience for passengers. It also features refrigeration / heating redundancy; if one refrigeration or heating circuit fails, the other circuits can continue to operate normally, improving system reliability. 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 front structure of the driver's cab air conditioning unit provided in an embodiment of this application;

[0024] Figure 2 This is a side sectional view of the driver's cab air conditioning unit provided in an embodiment of this application;

[0025] Figure 3 This is a three-dimensional structural diagram of the driver's cab air conditioning unit provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the bottom of the driver's cab air conditioning unit provided in an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the rear of the driver's cab air conditioning unit provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the structure of multiple evaporator coils provided in the embodiments of this application;

[0029] Figure 7 This is a schematic diagram of the structure of multiple condenser coils provided in the embodiments of this application.

[0030] In the diagram: 1-Casing; 2-Air outlet; 3-Condenser; 4-Baffle; 5-Compressor; 6-Condenser fan; 7-Evaporator fan; 8-Heater; 9-Gas-liquid separator; 10-Electrical control system; 11-Air inlet; 12-Electrical control chamber; 13-Subcooling pipe; 14-Water collection tray; 15-Evaporator; 16-Return air outlet; 17-Drier filter; 18-First maintenance port; 19-Air supply outlet; 20-Air outlet; 21-Drain pipe; 22-Drain outlet; 23-Second maintenance port; 24-Third maintenance port; 25-Evaporator coil; 26-Condenser coil; 27-Throttling device. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Please refer to Figure 1This embodiment provides a driver's cab air conditioning unit, which is suitable for regulating the air temperature in the driver's cab of rail transit vehicles. The driver's cab air conditioning unit includes a housing 1, a refrigeration system, and a heating system. The housing 1 includes an evaporator chamber and a condenser chamber, which can be distributed on the left and right sides of the housing 1 and are relatively independent. The refrigeration system includes at least two refrigeration circuits that can operate independently of each other. The refrigeration system also includes an evaporator 15 and a condenser 3 disposed on the multiple refrigeration circuits, that is, each multiple refrigeration circuit corresponds to one evaporator 15 and one condenser 3.

[0035] For example, at least two independent heat exchange channels are provided in the evaporator 15, and at least two independent heat exchange channels are also provided in the condenser 3. Here, "independent" means that the refrigerants in the two heat exchange channels do not interact. A first refrigeration loop is formed by connecting the first heat exchange channel in the evaporator 15 and the first heat exchange channel in the condenser 3 end-to-end; a second refrigeration loop is formed by connecting the second heat exchange channel in the evaporator 15 and the second heat exchange channel in the condenser 3 end-to-end. The first end of each heat exchange channel is defined as the fluid inlet end, and the last end is defined as the fluid outlet end.

[0036] Furthermore, the evaporator 15 includes several evaporation coils 25, please refer to... Figure 6 Multiple evaporator coils 25 are distributed perpendicular to the air inlet direction of the evaporator 15, which reduces the flow resistance of air flowing through the evaporator coils 25 and improves heat transfer efficiency. In the evaporator 15, each heat exchange channel can be composed of multiple evaporator coils 25, and the evaporator coils 25 in the two heat exchange channels are alternately distributed. That is, in the evaporator 15, two adjacent evaporator coils 25 are used as two heat exchange channels of the evaporator 15, thus forming two sets of heat exchange channels with alternating distribution. Multiple evaporator coils 25 can be arranged in parallel so that multiple evaporator coils 25 in the same heat exchange channel form a whole and are connected to the refrigeration circuit; similarly, multiple condenser coils 26 in the same heat exchange channel can also be arranged in parallel so that they are connected to the refrigeration circuit as a whole.

[0037] Based on the above embodiment, the two sets of heat exchange channels are alternately distributed in the evaporator 15, 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.

[0038] In some embodiments, the condenser 3 includes a plurality of condensing coils 26, please refer to Figure 7Similar to the arrangement of the evaporator coil 25, multiple condenser coils 26 are also distributed along the air inlet direction of the condenser 3. Adjacent condenser coils 26 serve as two sets of heat exchange channels for the condenser 3, thereby alternating the distribution of condenser coils 26 in the two sets of heat exchange channels. Through the above arrangement, the uniformity of airflow in the condenser 3 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.

[0039] The fluid inlet of evaporator coil 25 is located on the air outlet side of evaporator 15, and the fluid outlet of evaporator coil 25 is located on the air inlet side of evaporator 15. Please refer to [reference needed]. Figure 6 This means that the overall flow direction of the refrigerant in the evaporator 15 is opposite to the airflow direction, which allows for sufficient heat exchange between the indoor air and the refrigerant, improving heat exchange efficiency. Similarly, please refer to... Figure 7 The condenser coil 26 of the condenser 3 can be arranged horizontally. The fluid inlet of the condenser coil 26 is located on the air outlet side of the condenser 3, and the fluid outlet of the condenser coil 26 is located on the air inlet side of the condenser 3. That is, the overall flow direction of the refrigerant in the condenser 3 is opposite to the flow direction of the airflow, which can also improve the heat exchange efficiency between the outdoor air and the refrigerant.

[0040] In addition, each refrigeration circuit is equipped with a compressor 5 to cooperate with the evaporator 15 and the condenser 3 to form the refrigeration system of the driver's cab air conditioning unit; the refrigeration system also includes a condenser fan 6 and an evaporator fan 7. The condenser 3, compressor 5 and condenser fan 6 are arranged in the condensation chamber in sequence along the first direction. The flow direction of the outdoor air in the condensation chamber is: condenser 3-compressor 5-condenser fan 6. Here, the compressor 5 includes the compressor 5 in each refrigeration circuit, so that the airflow of the condenser fan 6 can carry away the heat around the compressor 5 and discharge it outside the casing 1.

[0041] The heating system includes a heater 8, which comprises at least two heating circuits, each operating independently. During heating operation, the heater 8 provides heating, and the two heating circuits can achieve full-power and half-power heating, offering more temperature control levels. It also provides heating redundancy, meaning that even if one heating circuit fails, the other can continue operating, preventing the entire unit from losing its heating capacity. The evaporator 15, heater 8, and evaporator fan 7 are sequentially arranged in the evaporation chamber along the second direction. The airflow from the evaporator fan 7 dissipates the cold air around the evaporator 15 or the heat around the heater 8 into the room.

[0042] 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 6 and the evaporator fan 7 to remove the cold or heat from the corresponding components.

[0043] In summary, the present application allows multiple refrigeration circuits to share the evaporator 15 and condenser 3. The refrigerant in each refrigeration circuit can exchange heat in the evaporator 15 and condenser 3, which avoids the excessive space occupied by the unit due to the addition of refrigeration circuits. At the same time, the condenser 3, compressor 5 and condenser fan 6 are arranged in sequence in the first direction, and the evaporator 15, heater 8 and evaporator fan 7 are arranged in sequence in the second direction. This allows multiple refrigeration circuits to share the condenser fan 6 and evaporator fan 7, and the refrigeration system and heating system to share the evaporator fan 7, which can greatly save the space occupied by the unit, and thus is suitable for places with limited space such as the driver's cab. Furthermore, the two cooling circuits can operate independently of each other. When a small amount of cooling is required, only one cooling circuit needs to be activated. Similarly, the heater in the heating system also has two heating circuits, each operating independently. Depending on the actual situation, one or both heating circuits can be activated. This allows for multi-level temperature control with a wider range of adjustment, providing passengers with a more comfortable experience. Therefore, it has cooling / heating redundancy functions. If one cooling or heating circuit fails, the other cooling and heating circuits can still operate normally, improving the system's reliability.

[0044] Please refer to Figure 1 and Figure 3 The condensing chamber has an air inlet 11 and an air outlet 20 at both ends in the first direction. Both the air inlet 11 and the air outlet 20 are located on the casing 1. The air inlet 11 corresponds to the condenser 3 in the first direction to ensure that the airflow can directly act on the condenser 3 and ensure the heat exchange efficiency between the condenser 3 and the airflow. The air outlet 20 corresponds to the air outlet end of the condensing fan 6 in the first direction to ensure that the airflow can be directly discharged from the casing 1 through the air outlet 20, avoiding the problem of poor heat dissipation of the condenser 3 and compressor 5 due to the inability of hot air in the condensing chamber to be discharged in time. Both the air inlet 11 and the air outlet 20 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 6, thereby carrying away the heat of the condenser 3 and compressor 5 in sequence, and is discharged back to the outside through the air outlet 20.

[0045] Please refer to Figure 2The evaporation chamber has a return air inlet 16 at one end in the second direction. The return air inlet 16 is located on the casing 1 and corresponds to the evaporator 15 in the second direction, thus ensuring that the airflow can directly remove the cold energy around the evaporator 15. The evaporation chamber is also provided with an air outlet 19 corresponding to the air supply end of the evaporation fan 7. The air outlet 19 is located on the casing 1, and both the return air inlet 16 and the air outlet 19 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 7, thereby successively removing the cold energy around the evaporator 15 or the heat around the heater 8, and is discharged back into the room through the air outlet 19.

[0046] In some embodiments, the housing 1 is provided with a partition 4 that divides its interior into an evaporation chamber and a condensation chamber. Please refer to [reference needed]. Figure 1 Under the action of partition 4, 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.

[0047] Please refer to Figures 1 to 3 An air vent 2 is provided on the partition 4, connecting the evaporation chamber and the condensation chamber. The opening degree of the air vent 2 is adjustable, thereby controlling the air volume passing through the air vent 2. Outdoor fresh air can enter the condensation chamber through the air inlet 11. When the air vent 2 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 2. After heat exchange in the evaporation chamber through the evaporator 15, it is discharged into the room, thereby providing fresh outdoor air to the room. The air vent 2 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 2 to achieve air volume control. These are not described in detail here, but all fall within the protection scope of this application.

[0048] It should be noted that the air vent 2 needs to be set in a preset area on the partition 4. This preset area corresponds to the area between the air inlet 11 and the condenser 3. That is, in the first direction, the air vent 2 is located between the air inlet 11 and the condenser 3 to ensure that the outdoor fresh air entering the evaporation chamber through the air vent 2 does not exchange heat with the condenser 3. This is because if the outdoor fresh air exchanges heat with the condenser 3, 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 evaporator 15, thus affecting the normal operation of the driver's cab air conditioning unit.

[0049] In some embodiments, the first direction is a vertical direction, that is, from the top of the casing 1 to the bottom of the casing 1. Based on this, the air inlet 11 is located at the top of the casing 1 and corresponds to the position of the condenser cavity, and the air outlet 20 is located at the bottom of the casing 1; please refer to Figure 1 and Figure 3The condenser 3 is arranged horizontally at the top of the condensing chamber, and the compressors 5 in the multiple refrigeration circuits are located below the condenser 3 and distributed horizontally. The condensing fan 6 is located below the condenser 3 and below the compressors 5. Outdoor air can pass through the condenser 3 and the compressors 5 and be discharged to the outside through the condensing fan 6.

[0050] Among them, the compressors 5 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 5 is larger, the airflow is smoother, and the efficiency of heat removal is higher.

[0051] In some embodiments, the second direction is the horizontal direction; please refer to... Figure 2 The return air vent 16 is located at the rear end of the casing 1 and faces the evaporator 15; the supply air vent 19 is located at the bottom end of the casing 1, meaning the condenser fan 6 can drive air to the outside of the bottom of the casing 1. Please refer to [reference needed]. Figure 4 .

[0052] In addition, a water collection tray 14 is provided at the bottom of the evaporation chamber, please refer to... Figure 2 The evaporator 15 is vertically positioned at the bottom of the evaporation chamber and located within the water collection tray 14. The condensate produced by the evaporator 15 accumulates in the water collection tray 14 and is drained to the outside of the casing 1 via the drain pipe 21. Specifically, please refer to... Figure 4 A drain pipe 21 can be installed inside the casing 1, and the drain outlet 22 of the drain pipe 21 can be led to the air outlet 20 to complete the discharge of condensate.

[0053] The driver's cab air conditioning unit also includes an electronic control system 10. An electronic control cavity 12 is provided in the evaporation cavity to accommodate the electronic control system 10. To facilitate manual operation or maintenance of the electronic control system 10, an electronic control door can be provided at the front end of the housing 1 corresponding to the electronic control cavity 12. At the same time, the electronic control cavity 12 is located on the upper part of the evaporation cavity and on the side close to the front end of the housing 1.

[0054] Considering the heat dissipation of the electronic control system 10, based on the above-mentioned arrangement of the air vent 2, the air vent 2 can also be located behind the electronic control cavity 12. After the outdoor fresh air enters the evaporation cavity through the air vent 2, 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 10, thereby ensuring the heat dissipation effect of the electronic control system 10. The air vent 2 is located above the evaporator 15. After the mixed air dissipates heat from the electronic control system 10, it can be discharged into the room after heat exchange through the evaporator 15.

[0055] To form a complete air conditioning refrigeration system, components such as a throttling device 27, a dryer filter 17, and a gas-liquid separator 9 are also installed on the multiple refrigeration circuits. In each refrigeration circuit, the refrigerant inside is powered by the compressor 5. The refrigerant flows from the compressor 5 to the condenser 3. After the refrigerant flows out of the condenser 3, it flows through the throttling device 27 to the evaporator 15. After the refrigerant flows out of the evaporator 15, it flows back to the compressor 5, thus forming a refrigeration circuit in which the refrigerant circulates.

[0056] The dryer filter 17 and the gas-liquid separator 9 are installed in the evaporation chamber. The gas-liquid separator 9 is located above the evaporator 15, and the electrical control chamber 12 is located above the gas-liquid separator 9. This arrangement makes full use of the space in the evaporation chamber, resulting in a more rational and compact arrangement of components. In each refrigeration circuit, the refrigerant flows from the condenser 3 through the dryer filter 17 to the throttling device 27. The dryer filter 17 absorbs residual moisture in the refrigerant, preventing ice blockage due to low-temperature freezing. It also filters impurities to prevent clogging of the throttling device 27. After flowing from the evaporator 15, the refrigerant flows through the gas-liquid separator 9 to the compressor 5, preventing liquid refrigerant from entering the compressor 5 and ensuring the stability and service life of the driver's cab air conditioning unit.

[0057] The evaporator 15 of this application is placed vertically, please refer to... Figure 2 Two independent subcooling pipes 13 are installed on the lower side of the evaporator 15, and each subcooling pipe 13 is connected to two refrigeration circuits respectively. Specifically, the subcooling pipe 13 is installed after the dryer filter 17 and before the throttling device 27 in the refrigeration circuit, so as to use the condensate water generated by the air conditioning system and the cold energy that is difficult to use on the bottom side to subcool the high-pressure refrigerant liquid from the condenser 3, 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 condenser 3 into liquid refrigerant, thereby increasing the amount of refrigerant liquid.

[0058] In full-capacity operation, multiple refrigeration circuits work simultaneously. Low-temperature, low-pressure refrigerant gas is compressed by compressor 5 into high-temperature, high-pressure refrigerant gas. It is then condensed into high-pressure refrigerant liquid in condenser 3. After passing through dryer filter 17, it enters subcooling pipe 13 before throttling, transforming from high-pressure refrigerant liquid at room temperature to high-pressure refrigerant liquid at a relatively low temperature. The refrigerant is then throttled by throttling device 27 into low-temperature, low-pressure refrigerant liquid. It then absorbs heat in evaporator 15, becoming low-temperature, low-pressure refrigerant gas. After passing through gas-liquid separator 9, it returns to compressor 5 for compression, 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 in evaporator 15 and condenser 3 can be uniformly distributed to ensure the indoor space quickly reaches or stably maintains the set temperature.

[0059] Please refer to Figure 3 and Figure 5 A first maintenance port 18 can be provided on the side of the casing 1 for installing and maintaining the compressor 5, condenser 3, and air vents 2 on the partition 4 in the condensing chamber. A second maintenance port 23 is provided on the upper part of the back of the casing 1 for charging refrigerant and welding copper pipes. A third maintenance port 24 is provided on the back of the casing 1 at the position corresponding to the evaporator 15, for installing and maintaining the evaporator 15 and surrounding components. When the driver's cab air conditioning unit is running normally, the three maintenance ports can be closed. When maintenance of the internal components of the casing 1 is required, the corresponding maintenance port can be opened.

[0060] This application also provides a rail transit vehicle, which includes a driver's cab and an air conditioning unit installed on the driver's cab, the air conditioning unit being the aforementioned driver's cab air conditioning unit.

[0061] 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.

[0062] 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 unit, characterized in that, include: The housing (1) includes an evaporation chamber and a condensation chamber; The refrigeration system includes at least two refrigeration circuits that can operate independently of each other, and also includes an evaporator (15) and a condenser (3) disposed on the multiple refrigeration circuits. Each refrigeration circuit is provided with a compressor (5) and a throttling device (27). The refrigerant in each refrigeration circuit flows from the compressor (5) to the condenser (3), and after the refrigerant flows out of the condenser (3), it flows through the throttling device (27) to the evaporator (15). After the refrigerant flows out of the evaporator (15), it flows to the compressor (5). The refrigeration system also includes a condenser fan (6) and an evaporator fan (7). The condenser (3), the compressor (5) and the condenser fan (6) are arranged sequentially in the condensation chamber along a first direction. The heating system includes a heater (8), which includes at least two sets of heating circuits that can operate independently of each other. The evaporator (15), the heater (8) and the evaporation fan (7) are arranged sequentially in the evaporation chamber along a second direction.

2. The driver's cab air conditioning unit according to claim 1, characterized in that, The condensing chamber is provided with an air inlet (11) and an air outlet (20) at both ends in the first direction. The air inlet (11) corresponds to the condenser (3) in the first direction, and the air outlet (20) corresponds to the condensing fan (6) in the first direction. The air inlet (11) and the air outlet (20) are located on the outdoor side.

3. The driver's cab air conditioning unit according to claim 2, characterized in that, The evaporation chamber is provided with a return air inlet (16) at one end in the second direction. The return air inlet (16) corresponds to the evaporator (15) in the second direction. The evaporation chamber is provided with an air outlet (19) corresponding to the air supply end of the evaporation fan (7). The return air inlet (16) and the air outlet (19) are located on the indoor side.

4. The driver's cab air conditioning unit according to claim 3, characterized in that, The housing (1) is provided with a partition (4) that divides its interior into the evaporation chamber and the condensation chamber. The partition (4) is provided with an air vent (2) that connects the evaporation chamber and the condensation chamber. The air vent (2) is located in a preset area of ​​the partition (4). The preset area corresponds to the area between the air inlet (11) and the condenser (3). The opening degree of the air vent (2) is adjustable.

5. The driver's cab air conditioning unit according to claim 4, characterized in that, The first direction is vertical. The air inlet (11) is located at the top of the housing (1), the air outlet (20) is located at the bottom of the housing (1), the condenser (3) is horizontally arranged on the upper part of the condensing chamber, and multiple compressors (5) are distributed horizontally in the condensing chamber.

6. The driver's cab air conditioning unit according to claim 4, characterized in that, The second direction is horizontal. The return air vent (16) is located at the rear end of the housing (1). The air supply vent (19) is located at the bottom end of the housing (1). A water collection tray (14) is provided at the bottom of the evaporation chamber. The evaporator (15) is vertically arranged in the lower part of the evaporation chamber and located in the water collection tray (14). The condensate in the water collection tray (14) is led to the outside of the housing (1) through the drain pipe (21).

7. The driver's cab air conditioning unit according to claim 6, characterized in that, It also includes an electronic control system (10), and the evaporation chamber is provided with an electronic control cavity (12) for accommodating the electronic control system (10). The electronic control cavity (12) is located on the upper part of the evaporation chamber and close to the front end of the casing (1). The air outlet (2) is located on the rear side of the electronic control cavity (12) and above the evaporator (15).

8. The driver's cab air conditioning unit according to claim 7, characterized in that, Each of the refrigeration circuits is also provided with a dryer filter (17) and a gas-liquid separator (9). The dryer filter (17) and the gas-liquid separator (9) are arranged in the evaporation chamber. The gas-liquid separator (9) is located above the evaporator (15). The electronic control chamber (12) is located above the gas-liquid separator (9). The refrigerant in each of the refrigeration circuits flows out of the condenser (3) and then through the dryer filter (17) to the throttling device (27). The refrigerant flows out of the evaporator (15) and then through the gas-liquid separator (9) to the compressor (5).

9. The driver's cab air conditioning unit according to any one of claims 1-8, characterized in that, The evaporator (15) is provided with several independent subcooling pipes (13) on its lower side, and the subcooling pipes (13) are respectively in each of the refrigeration circuits.

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

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