Air conditioning system and rail transit vehicle

Abstract

The air conditioning system comprises a compressor, a four-way reversing valve, a condenser, a first electronic expansion valve, an evaporator and a supercooling pipe, one end of the supercooling pipe is connected with the condenser, the other end of the supercooling pipe is connected with a second opening of the evaporator through the first electronic expansion valve, and a first opening of the evaporator is connected with the four-way reversing valve. During refrigeration, a refrigerant output by the compressor sequentially passes through the four-way reversing valve, the condenser, the supercooling pipe, the first electronic expansion valve, the evaporator and the four-way reversing valve and then flows back to the compressor. It can be seen that the liquid refrigerant which is not throttled can be supercooled in the supercooling pipe, the cooling capacity comes from condensate water or part of the cooling capacity generated by the evaporator, and the condensate water can be reduced; meanwhile, the unit refrigerating capacity of the throttled refrigerant can be obviously improved, the number of tube rows of the evaporator is reduced, the amount of the refrigerant filled in the system is reduced compared with that of the refrigerant filled in the original system, the power of the compressor can be reduced, and finally the energy efficiency of the whole air conditioning system can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. In addition, the utility model also relates to a rail transit vehicle comprising the air conditioning system. Background Art

[0002] With the development of society, air conditioners are becoming increasingly common in our daily lives. They are used in a variety of environments, from fixed homes to mobile vehicles, where air conditioners are essential for providing a comfortable environment. However, as a frequently used device, air conditioners consume significant amounts of energy over extended periods of operation, resulting in low energy efficiency.

[0003] In the process of realizing the present invention, the inventors discovered that the prior art has at least the following problems:

[0004] While existing solutions improve air conditioner energy efficiency by modifying the evaporator, they also complicate production and maintenance. Furthermore, condensate accumulated under the baffles can cause hygiene issues and contaminate metal parts. Furthermore, in certain regions where large amounts of condensate are produced in spring, the added baffles can become a burden on the evaporator.

[0005] Therefore, how to provide an air-conditioning system that can improve energy efficiency and reduce condensation water is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0006] The present invention aims to provide an air conditioning system that can improve energy efficiency and reduce condensation. Another object of the present invention is to provide a rail transit vehicle comprising the air conditioning system.

[0007] In order to effectively solve the above technical problems, the present utility model provides an air-conditioning system, including a compressor, a four-way reversing valve, a condenser, a first electronic expansion valve, an evaporator and a subcooling pipe, one end of the subcooling pipe is connected to the condenser, and the other end of the subcooling pipe is connected to the second port of the evaporator through the first electronic expansion valve, and the first port of the evaporator is connected to the four-way reversing valve. During cooling, the refrigerant output by the compressor passes through the four-way reversing valve, the condenser, the subcooling pipe, the first electronic expansion valve, the evaporator and the four-way reversing valve in sequence and flows back to the compressor.

[0008] In one possible design, a second electronic expansion valve is provided between the condenser and the subcooling pipe. During heating, the refrigerant output by the compressor flows back to the compressor through the four-way reversing valve, the evaporator, the first electronic expansion valve, the subcooling pipe, the second electronic expansion valve, the condenser and the four-way reversing valve in sequence.

[0009] In a possible design, a drying filter is provided between the second electronic expansion valve and the supercooling pipe.

[0010] In one possible design, the evaporator includes multiple evaporator tube assemblies in parallel, each of the evaporator tube assemblies is individually connected to the subcooling tube and the first electronic expansion valve, all of the subcooling tubes are simultaneously connected to the drying filter, and all of the evaporator tube assemblies are simultaneously connected to the four-way reversing valve.

[0011] In one possible design, it includes a liquid main pipe and multiple liquid branch pipes, one end of the liquid main pipe is connected to the drying filter, and the other end of the liquid main pipe is simultaneously connected to multiple liquid branch pipes, each of the liquid branch pipes is respectively connected to each subcooling pipe, and it also includes a gas main pipe and multiple gas branch pipes, one end of the gas main pipe is connected to the four-way reversing valve, and the other end of the gas main pipe is simultaneously connected to multiple gas branch pipes, each of the gas branch pipes is respectively connected to each evaporation tube assembly.

[0012] In one possible design, each of the subcooling tubes includes two subcooling liquid inlet pipes and one subcooling liquid outlet pipe, the two subcooling liquid inlet pipes are connected in parallel to the corresponding liquid branch pipes, one end of the subcooling liquid outlet pipe is connected to the two subcooling liquid inlet pipes at the same time, and the other end of the subcooling liquid outlet pipe is connected to the corresponding evaporation tube assembly through the first electronic expansion valve.

[0013] In one possible design, each of the evaporating tube assemblies is equipped with a ventilator, a condensing fan is provided at the condenser, a low-pressure switch, a gas-liquid separator and a low-pressure sensor are provided at the input end of the compressor in sequence, and a one-way valve, a high-pressure switch and a high-pressure sensor are provided at the output end of the compressor in sequence.

[0014] Preferably, the tubes of the evaporation tube assembly and the supercooling tubes are arranged in an array, and the supercooling tubes are located below the evaporation tube assembly.

[0015] Preferably, each of the liquid branch pipes is provided with an individually controlled on-off valve.

[0016] Preferably, a component reversing valve is provided at the junction of the liquid main pipe and each of the liquid branch pipes, and the component reversing valve can separately control each of the liquid branch pipes to be connected to the liquid main pipe.

[0017] Preferably, two of the evaporation tube assemblies are included, and the reversing valve of the assembly is a proportionally adjustable three-position three-way reversing valve. When the proportionally adjustable three-position three-way reversing valve is in a first working position, one of the liquid branch pipes is connected to the liquid main pipe. When the proportionally adjustable three-position three-way reversing valve is in a second working position, the other liquid branch pipe is connected to the liquid main pipe. When the proportionally adjustable three-position three-way reversing valve is in a third working position, the two liquid branch pipes are simultaneously connected to the liquid main pipe.

[0018] The utility model provides a rail transit vehicle, comprising an air-conditioning system as described in any one of the above.

[0019] Compared with the prior art, the air conditioning system and rail transit vehicle provided by the present invention have at least the following beneficial effects:

[0020] The utility model provides an air conditioning system, comprising a compressor, a four-way reversing valve, a condenser, a first electronic expansion valve, an evaporator, and a subcooling pipe, wherein the output end of the compressor is connected to the first interface of the four-way reversing valve, the second interface, the third interface, and the fourth interface of the four-way reversing valve are respectively connected to the input end of the compressor, the condenser, and the evaporator, and the evaporator is connected to the condenser via the first electronic expansion valve and the subcooling pipe. The flow direction of the refrigerant in the condenser and the evaporator is controlled by switching the four-way reversing valve. In particular, one end of the subcooling pipe is connected to the condenser, the other end of the subcooling pipe is connected to the second port of the evaporator via the first electronic expansion valve, and the first port of the evaporator is connected to the four-way reversing valve. During cooling, the refrigerant output by the compressor flows back to the compressor through the four-way reversing valve, the condenser, the subcooling pipe, the first electronic expansion valve, the evaporator, and the four-way reversing valve in sequence.

[0021] The liquid refrigerant coming out of the condenser flows to the subcooling pipe added before the first electronic expansion valve. The subcooling pipe does not need to add auxiliary facilities. The refrigerant coming out of the condenser first passes through the subcooling pipe. The unthrottled liquid refrigerant will be supercooled in the subcooling pipe. The cooling capacity required here comes from the condensed water or part of the cooling capacity generated by the evaporator. Through the above method, the condensed water has been reasonably utilized, which can reduce the condensed water and help reduce the collection of condensed water. At the same time, the refrigerant after passing through the subcooling pipe will have a significantly improved unit cooling capacity after throttling, reducing the number of evaporator tube rows. Compared with the original system, the amount of refrigerant charged is reduced, which can reduce the power of the compressor. However, the increase in the unit cooling capacity of the refrigerant will ultimately improve the energy efficiency of the entire air-conditioning system. In summary, the air-conditioning system provided by the utility model can improve energy efficiency and reduce condensed water.

[0022] The present utility model also provides a rail transit vehicle including the above-mentioned air-conditioning system. Since the above-mentioned air-conditioning system has the above-mentioned technical effects, the above-mentioned rail transit vehicle should also have the same technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the cooling mode flow direction of a specific embodiment of the air-conditioning system provided by the present invention;

[0024] Figure 2 This is a flow diagram of a heating mode of a specific embodiment of the air-conditioning system provided by the present invention;

[0025] Figure 3 A schematic diagram of the radiator structure of the first embodiment of the air-conditioning system provided by the present utility model;

[0026] Figure 4 A schematic diagram of the radiator structure of the second embodiment of the air-conditioning system provided by the present utility model;

[0027] Figure 5 This is a schematic diagram of the radiator structure of Example 3 of the air-conditioning system provided by the present utility model.

[0028] Among them, there are compressor 1, four-way reversing valve 2, condenser 3, first electronic expansion valve 4, evaporator 5, evaporation tube assembly 5-1, gas main pipe 5-2, gas branch pipe 5-3, subcooling pipe 6, liquid main pipe 6-1, liquid branch pipe 6-2, subcooling liquid inlet pipe 6-3, subcooling liquid outlet pipe 6-4, switch valve 6-5, proportional adjustment three-position three-way reversing valve 6-6, second electronic expansion valve 7, drying filter 8, ventilator 9, condensing fan 10, low-pressure switch 11, low-pressure sensor 12, gas-liquid separator 13, one-way valve 14, high-pressure switch 15, and high-pressure sensor 16. DETAILED DESCRIPTION

[0029] The core of this utility model is to provide an air conditioning system. During the cooling process, the refrigerant enters the subcooling pipe for subcooling before entering the first electronic expansion valve and evaporator. This effectively reduces condensation and significantly increases the unit cooling capacity of the refrigerant, thereby reducing compressor power and improving the energy efficiency of the entire air conditioning system. Another core of this utility model is to provide a rail transit vehicle including the above-mentioned air conditioning system.

[0030] In order to enable those skilled in the art to better understand the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0031] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of the cooling mode flow direction of a specific embodiment of the air-conditioning system provided by the present invention; Figure 2 This is a flow diagram of the heating mode of a specific implementation of the air-conditioning system provided by the utility model.

[0032] The present invention provides an air conditioning system comprising a compressor 1, a four-way reversing valve 2, a condenser 3, a first electronic expansion valve 4, an evaporator 5, and a subcooling pipe 6. The output (exhaust port) of the compressor 1 is connected to the first port of the four-way reversing valve 2. The second, third, and fourth ports of the four-way reversing valve 2 are respectively connected to the input (intake port) of the compressor 1, the condenser 3, and the first port of the evaporator 5. The second port of the evaporator 5 is connected to the first electronic expansion valve 4, which is connected to the subcooling pipe 6, which is in turn connected to the condenser 3. The refrigerant flow direction within the condenser and evaporator is controlled by switching the four-way reversing valve. Specifically, one end of the subcooling pipe 6 is connected to the condenser 3, and the other end of the subcooling pipe 6 is connected to the second port of the evaporator 5 via the first electronic expansion valve 4. The first port of the evaporator 5 is connected to the four-way reversing valve 2.

[0033] In order to ensure the stable operation of the air conditioner, a fan 9 is provided at the evaporator 5, a condensing fan 10 is provided at the condenser 3, a low-pressure switch 11, a gas-liquid separator 13 and a low-pressure sensor 12 are provided at the input end of the compressor 1 in sequence, and a one-way valve 14, a high-pressure switch 15 and a high-pressure sensor 16 are provided at the output end of the compressor 1 in sequence.

[0034] During cooling, through the control of the four-way reversing valve 2, the refrigerant output by the compressor 1 flows back to the compressor 1 through the four-way reversing valve 2, the condenser 3, the subcooling pipe 6, the first electronic expansion valve 4, the evaporator 5 and the four-way reversing valve 2 in sequence.

[0035] During heating, the refrigerant output from compressor 1 is controlled by four-way reversing valve 2, passing through four-way reversing valve 2, evaporator 5, first electronic expansion valve 4, subcooling pipe 6, condenser 3, and four-way reversing valve 2, returning to compressor 1. Evaporator 5, the indoor heat exchanger, releases heat to the outside during heating and absorbs heat from the indoor air during cooling. Condenser 3, the outdoor heat exchanger, absorbs heat from the outdoor air during heating and releases heat to the outside during cooling.

[0036] During the refrigeration process, the liquid refrigerant coming out of the condenser 3 flows to the subcooling pipe 6 added before the first electronic expansion valve 4. The subcooling pipe 6 does not need to add auxiliary facilities. The refrigerant coming out of the condenser 3 first passes through the subcooling pipe 6. The unthrottled liquid refrigerant will be supercooled in the subcooling pipe 6. The cooling capacity required here comes from the condensed water or part of the cooling capacity generated by the evaporator 5. Through the above method, the condensed water has been reasonably utilized, which can reduce the condensed water and help reduce the collection of condensed water. At the same time, the refrigerant after passing through the subcooling pipe will have a significantly improved unit cooling capacity after throttling. When the rated cooling capacity remains unchanged, the number of tube rows of the evaporator mainly used for heat exchange with the indoor air is reduced. Compared with the original system, the amount of refrigerant charged is reduced, which can reduce the power of the compressor. However, the increase in the unit cooling capacity of the refrigerant will eventually improve the energy efficiency of the entire air-conditioning system. In summary, the air-conditioning system provided by the utility model can improve energy efficiency and reduce condensed water.

[0037] During heating, the heating capacity required by the air conditioning system for rail transit vehicles is relatively small compared to the cooling capacity. Compared to conventional solutions, the heating efficiency of the indoor heat exchanger (i.e., evaporator 5) is minimally affected, and the refrigerant is still relatively hot when it leaves the indoor heat exchanger. The addition of a subcooling tube converts the gaseous refrigerant into a liquid state, transferring the excess heat indoors. Therefore, compared to solutions without subcooling tubes, the heating efficiency of this application is comparable to that of conventional solutions.

[0038] Furthermore, in order to ensure the heating effect, a second electronic expansion valve 7 is provided between the condenser 3 and the subcooling pipe 6 , and a drying filter 8 may also be provided between the second electronic expansion valve 7 and the subcooling pipe 6 .

[0039] During cooling, the refrigerant output from compressor 1, controlled by four-way reversing valve 2, flows sequentially through four-way reversing valve 2, condenser 3, second electronic expansion valve 7, filter drier 8, subcooling pipe 6, first electronic expansion valve 4, evaporator 5, and four-way reversing valve 2, returning to compressor 1. The high-pressure refrigerant at room temperature exiting condenser 3 passes through second electronic expansion valve 7 and filter drier 8. At this point, second electronic expansion valve 7 does not throttle, acting as a stop valve. The refrigerant is supercooled by the subcooling pipe 6, and the refrigerant liquid is subcooled to a certain degree. The supercooled refrigerant liquid is throttled by the first electronic expansion valve 4, and after heat exchange in the evaporator 5, it returns to compressor 1 through four-way reversing valve 2.

[0040] During heating, the refrigerant output from compressor 1, controlled by four-way reversing valve 2, flows sequentially through four-way reversing valve 2, evaporator 5, first electronic expansion valve 4, subcooling pipe 6, filter drier 8, second electronic expansion valve 7, condenser 3, and four-way reversing valve 2, returning to compressor 1. The high-temperature, high-pressure refrigerant vapor from compressor 1 exchanges heat in the indoor heat exchanger (i.e., evaporator 5), where it becomes a refrigerant liquid at room temperature. The refrigerant liquid then passes through subcooling pipe 6 and reaches first electronic expansion valve 4 and filter drier 8. At this point, first electronic expansion valve 4 does not throttle, acting as a stop valve, and evaporates and exchanges heat in the outdoor heat exchanger (i.e., condenser 3).

[0041] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the radiator structure of Example 1 of the air-conditioning system provided by the utility model.

[0042] In the first embodiment, the evaporator 5 includes multiple evaporator tube assemblies 5-1 connected in parallel. Each evaporator tube assembly 5-1 includes multiple tubes arranged in an array and connected end-to-end according to the arrangement to form a coil structure. Each evaporator tube assembly 5-1 is individually connected to a subcooling tube 6 and a first electronic expansion valve 4. Ultimately, all subcooling tubes 6 are simultaneously connected to a filter drier 8, and all evaporator tube assemblies 5-1 are simultaneously connected to a four-way reversing valve 2. The number of evaporator tube assemblies 5-1 can be two or more, equipped with the same number of subcooling tubes 6 and first electronic expansion valves 4. It is understood that each evaporator tube assembly 5-1 is equipped with a ventilator 9 to achieve forced convection between the evaporator tube assembly 5-1 and the indoor air.

[0043] In order to achieve smooth flow, it includes a liquid main pipe 6-1 and multiple liquid branch pipes 6-2. One end of the liquid main pipe 6-1 is connected to the drying filter 8, and the other end of the liquid main pipe 6-1 is connected to multiple liquid branch pipes 6-2 at the same time. Each liquid branch pipe 6-2 is respectively connected to each subcooling pipe 6. It also includes a gas main pipe 5-2 and multiple gas branch pipes 5-3. One end of the gas main pipe 5-2 is connected to the four-way reversing valve 2, and the other end of the gas main pipe 5-2 is connected to multiple gas branch pipes 5-3 at the same time. Each gas branch pipe 5-3 is respectively connected to each evaporation tube assembly 5-1.

[0044] During cooling, the refrigerant flows in the following direction: after flowing out of the filter drier 8, the refrigerant enters the liquid main pipe 6-1, and then is divided into each liquid branch pipe 6-2. Subsequently, the refrigerant enters the corresponding subcooling pipe 6, the first electronic expansion valve 4, and the second port of the evaporation tube assembly 5-1 in sequence. After completing heat absorption and evaporation in the evaporation tube assembly 5-1, the refrigerant enters the gas branch pipe 5-3 from the first port of the evaporation tube assembly 5-1. The refrigerant in each gas branch pipe 5-3 converges in the gas main pipe 5-2, and finally flows to the four-way reversing valve 2, and finally flows back to the compressor 1. During heating, the flow direction is opposite, which will not be described in detail here. At the same time, according to the number of evaporation tube assemblies 5-1 set, a corresponding number of liquid branch pipes 6-2 and gas branch pipes 5-3 are equipped. Of course, other layout methods can also be used. For example, if the number of evaporation tube assemblies 5-1 is small, the same number of pipes can be directly drawn from the filter drier 8, which is equivalent to equipping each evaporation tube assembly 5-1 with a separate pipe to ensure system reliability.

[0045] Preferably, each subcooling pipe 6 includes two subcooling liquid inlet pipes 6-3 and one subcooling liquid outlet pipe 6-4, the two subcooling liquid inlet pipes 6-3 are connected in parallel to the corresponding liquid branch pipe 6-2, one end of the subcooling liquid outlet pipe 6-4 is connected to the two subcooling liquid inlet pipes 6-3 at the same time, and the other end of the subcooling liquid outlet pipe 6-4 is connected to the corresponding evaporation tube assembly 5-1 through the first electronic expansion valve 4.

[0046] Specifically, the tubes of the evaporator tube assembly 5-1 and the subcooling tubes 6 are arranged in an array, with the subcooling tubes 6 located below the evaporator tube assembly 5-1. This means the subcooling tubes 6 can be provided separately, or the bottom few tubes can be directly configured as the subcooling liquid inlet 6-3 and subcooling liquid outlet 6-4 after the tubes of the evaporator tube assembly 5-1 are manufactured. The layout and location of the individual tubes can also be adjusted, all within the scope of protection of the present invention.

[0047] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the radiator structure of Example 2 of the air-conditioning system provided by the utility model.

[0048] In Example 2, the other structures are the same as in Example 1, except that each liquid branch pipe 6-2 is provided with an independently controlled on-off valve 6-5. This allows for independent control of each evaporation tube assembly 5-1. When the cooling power is low, only some of the on-off valves 6-5 are opened, allowing some of the evaporation tube assemblies 5-1 to operate. When the cooling power is high, all of the on-off valves 6-5 can be opened, allowing all of the evaporation tube assemblies 5-1 to operate.

[0049] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the radiator structure of Example 3 of the air-conditioning system provided by the present utility model.

[0050] In the third embodiment, other structures are the same as those in the first embodiment, except that a component reversing valve is provided at the junction of the liquid main pipe 6-1 and each liquid branch pipe 6-2, and the component reversing valve can control each liquid branch pipe 6-2 to conduct to the liquid main pipe 6-1.

[0051] Specifically, it includes two evaporation tube assemblies 5-1, and the assembly reversing valve is a proportional adjustment three-position three-way reversing valve 6-6. When the proportional adjustment three-position three-way reversing valve 6-6 is in the first working position, one liquid branch pipe 6-2 is connected to the liquid main pipe 6-1. When the proportional adjustment three-position three-way reversing valve 6-6 is in the second working position, the other liquid branch pipe 6-2 is connected to the liquid main pipe 6-1. When the proportional adjustment three-position three-way reversing valve 6-6 is in the third working position, the two liquid branch pipes 6-2 are simultaneously connected to the liquid main pipe 6-1.

[0052] Among them, the middle position of the proportional adjustment three-position three-way reversing valve 6-6 is Y-shaped, the first interface of the proportional adjustment three-position three-way reversing valve 6-6 is connected to the drying filter 8, the second interface of the proportional adjustment three-position three-way reversing valve 6-6 is connected to the first supercooling pipe 6, and the second interface of the proportional adjustment three-position three-way reversing valve 6-6 is connected to the second supercooling pipe 6. When the proportional adjustment three-position three-way reversing valve 6-6 is in the left position, the first interface is connected to the second interface, the drying filter 8 is connected to the first supercooling pipe 6, and the second supercooling pipe 6 is isolated. When the proportional adjustment three-position three-way reversing valve 6-6 is in the right position, the first interface is connected to the third interface, the drying filter 8 is connected to the second supercooling pipe 6, and the first supercooling pipe 6 is isolated. When the proportional adjustment three-position three-way reversing valve 6-6 is in the middle position, the first interface is connected to the second interface and the second interface at the same time, and the drying filter 8 is connected to the first and second supercooling pipes 6 at the same time, thereby realizing the separate control of the evaporation tube assembly 5-1.

[0053] Furthermore, a proportional control valve can be used to adjust the flow of the refrigerant entering the subcooling pipe 6 to achieve precise control. The proportional control three-position three-way reversing valve 6-6 can be controlled by various methods such as electric control, hydraulic control, and gas control, all of which are within the protection scope of the present invention.

[0054] In addition to the above-mentioned air-conditioning system, the specific embodiment of the present invention also provides a rail transit vehicle including the above-mentioned air-conditioning system. For the structures of other parts of the rail transit vehicle, please refer to the prior art and will not be described in detail herein.

[0055] The above is a detailed introduction to the air-conditioning system and rail transit vehicle provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the method and core ideas of the present invention. It should be pointed out that, for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An air conditioning system, characterized in that: The invention comprises a compressor (1), a four-way reversing valve (2), a condenser (3), a first electronic expansion valve (4), an evaporator (5) and a subcooling pipe (6), wherein one end of the subcooling pipe (6) is connected to the condenser (3), the other end of the subcooling pipe (6) is connected to the second port of the evaporator (5) through the first electronic expansion valve (4), and the first port of the evaporator (5) is connected to the four-way reversing valve (2). During cooling, the refrigerant output by the compressor (1) flows back to the compressor (1) through the four-way reversing valve (2), the condenser (3), the subcooling pipe (6), the first electronic expansion valve (4), the evaporator (5) and the four-way reversing valve (2) in sequence.

2. The air conditioning system according to claim 1, characterized in that A second electronic expansion valve (7) is provided between the condenser (3) and the subcooling pipe (6). When heating, the refrigerant output by the compressor (1) flows back to the compressor (1) through the four-way reversing valve (2), the evaporator (5), the first electronic expansion valve (4), the subcooling pipe (6), the second electronic expansion valve (7), the condenser (3) and the four-way reversing valve (2) in sequence.

3. The air conditioning system according to claim 2, characterized in that A drying filter (8) is provided between the second electronic expansion valve (7) and the supercooling pipe (6).

4. The air conditioning system according to claim 3, characterized in that The evaporator (5) comprises a plurality of evaporation tube assemblies (5-1) connected in parallel, each of the evaporation tube assemblies (5-1) being individually connected to the subcooling tube (6) and the first electronic expansion valve (4), all of the subcooling tubes (6) being simultaneously connected to the drying filter (8), and all of the evaporation tube assemblies (5-1) being simultaneously connected to the four-way reversing valve (2).

5. The air conditioning system according to claim 4, characterized in that The invention comprises a liquid main pipe (6-1) and a plurality of liquid branch pipes (6-2), one end of the liquid main pipe (6-1) is connected to the drying filter (8), the other end of the liquid main pipe (6-1) is simultaneously connected to the plurality of liquid branch pipes (6-2), and each of the liquid branch pipes (6-2) is respectively connected to each subcooling pipe (6), and also comprises a gas main pipe (5-2) and a plurality of gas branch pipes (5-3), one end of the gas main pipe (5-2) is connected to the four-way reversing valve (2), the other end of the gas main pipe (5-2) is simultaneously connected to the plurality of gas branch pipes (5-3), and each of the gas branch pipes (5-3) is respectively connected to each of the evaporation tube assemblies (5-1).

6. The air conditioning system according to claim 5, characterized in that Each of the subcooling pipes (6) comprises two subcooling liquid inlet pipes (6-3) and one subcooling liquid outlet pipe (6-4), the two subcooling liquid inlet pipes (6-3) are connected in parallel to the corresponding liquid branch pipes (6-2), one end of the subcooling liquid outlet pipe (6-4) is connected to the two subcooling liquid inlet pipes (6-3) at the same time, and the other end of the subcooling liquid outlet pipe (6-4) is connected to the corresponding evaporation pipe assembly (5-1) through the first electronic expansion valve (4).

7. The air conditioning system according to claim 6, characterized in that Each of the evaporating tube assemblies (5-1) is provided with a ventilator (9), the condenser (3) is provided with a condensing fan (10), the input end of the compressor (1) is provided with a low-pressure switch (11), a gas-liquid separator (13) and a low-pressure sensor (12) in sequence, and the output end of the compressor (1) is provided with a one-way valve (14), a high-pressure switch (15) and a high-pressure sensor (16) in sequence.

8. The air conditioning system according to claim 5, characterized in that The tubes of the evaporation tube assembly (5-1) and the supercooling tube (6) are arranged in an array, and the supercooling tube (6) is located below the evaporation tube assembly (5-1).

9. The air conditioning system according to any one of claims 5 to 8, characterized in that: Each of the liquid branch pipes (6-2) is provided with an independently controlled switch valve (6-5).

10. The air conditioning system according to any one of claims 5 to 8, characterized in that: A component reversing valve is provided at the junction of the liquid main pipe (6-1) and each of the liquid branch pipes (6-2), and the component reversing valve can respectively control each of the liquid branch pipes (6-2) to be connected to the liquid main pipe (6-1).

11. The air conditioning system according to claim 10, characterized in that The invention comprises two evaporation tube assemblies (5-1), wherein the reversing valve of the assembly is a proportionally adjustable three-position three-way reversing valve (6-6); when the proportionally adjustable three-position three-way reversing valve (6-6) is in a first working position, one of the liquid branch pipes (6-2) is connected to the liquid main pipe (6-1); when the proportionally adjustable three-position three-way reversing valve (6-6) is in a second working position, the other of the liquid branch pipes (6-2) is connected to the liquid main pipe (6-1); and when the proportionally adjustable three-position three-way reversing valve (6-6) is in a third working position, the two liquid branch pipes (6-2) are simultaneously connected to the liquid main pipe (6-1).

12. A rail transit vehicle, characterized in that: The air conditioning system comprises the air conditioning system according to any one of claims 1 to 11.

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