Independent circulation air conditioning system and method

Abstract

The present application relates to the field of vehicle central air conditioning, and in particular to an independent circulation air conditioning system and method, the independent circulation air conditioning system comprising a vehicle body, an air conditioning unit and a heat exchange unit, a plurality of carriages are formed in the vehicle body, and a main air duct is also formed in the vehicle body, the main air duct is divided into a dynamic pressure cavity, a static pressure cavity and a return air cavity; each carriage is connected with at least one heat exchange unit, the heat exchange unit is located in the static pressure cavity and is in communication with the dynamic pressure cavity and the return air cavity; the heat exchange airflow output by the air conditioner enters the static pressure cavity through the dynamic pressure cavity, is heat exchanged through the heat exchange unit and is then fed back to the air conditioner from the return air cavity; the internal airflow in the carriage enters the airflow channel of the heat exchange unit, is heat exchanged with the heat exchange airflow in the airflow channel and is then fed back to the carriage from the air outlet end; the air in each carriage is heat exchanged with the airflow fed into the main air duct by the air conditioning unit through the heat exchange unit, which is beneficial to reducing the spread of viruses and bacteria between carriages and is safer.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of centralized air conditioning of vehicles, and particularly relates to an independent circulation air conditioning system and method. BACKGROUND

[0002] The existing air conditioning units in rail vehicles or buildings are all of an integrated structure. Taking a rail vehicle network as an example, the air conditioning unit is integrally installed at a roof position of the rail vehicle, and the airflow output by the air conditioning unit is directly input into a dynamic pressure chamber of the vehicle body, and is directly delivered from the dynamic pressure chamber to each vehicle compartment through a static pressure chamber. When returning air, the air is returned to the air conditioning unit through an air return opening penetrating through a side wall of the vehicle or directly through a passenger vehicle space, and reaches an air return opening at a bottom of the air conditioning unit to complete a cycle.

[0003] The air conditioning structure is essentially to mix and treat the air in each vehicle compartment and then send it out. If some passengers in the vehicle compartment carry viruses or bacteria, the viruses or bacteria can be spread to each vehicle compartment through the air conditioning unit, and the spread range is wide. Even if the train compartment has an independent area space, the air in the independent area space is also mixed and circulated air of the whole vehicle, and the above problems cannot be avoided. SUMMARY

[0004] The present application aims to provide an independent circulation air conditioning system and method to solve the problems in the prior art, such as the centralized air supply and return air mode of the existing vehicle air conditioning unit, the mixed treatment of the air in the whole vehicle, and the faster spread of bacteria and viruses in different vehicle compartments, low safety, and the like.

[0005] To achieve the above-mentioned application purposes, the present application adopts the following technical solutions:

[0006] In one aspect, the present application provides an independent circulation air conditioning system, which comprises:

[0007] a vehicle body, a plurality of vehicle compartments are formed along a length direction of the vehicle body, and a main air duct is further formed in the vehicle body, the main air duct is divided into a dynamic pressure chamber, a static pressure chamber, and an air return chamber;

[0008] an air conditioning unit, which is installed at a top of one end of the vehicle body and comprises an air conditioner, an air outlet part of the air conditioner is communicated with the dynamic pressure chamber, and an air return part of the air conditioner is communicated with the air return chamber;

[0009] a heat exchange unit, at least one heat exchange unit is connected to each of the vehicle compartments, the heat exchange unit is located in the static pressure chamber and is communicated with the dynamic pressure chamber and the air return chamber, respectively; each of the heat exchange units comprises a plurality of heat exchange fins, a ventilation gap is formed between adjacent heat exchange fins for the flow of heat exchange air in the static pressure chamber, an air inlet end and an air outlet end of an air flow channel formed in each of the heat exchange fins are respectively communicated with the corresponding vehicle compartment for the flow of internal air in the vehicle compartment.

[0010] The heat exchange airflow output from the air conditioner enters the dynamic pressure chamber and then enters the static pressure chamber. It is then output to the return air chamber through the airflow channel and finally returned to the air conditioner.

[0011] The internal airflow inside the carriage enters the airflow channel from the air inlet end of the heat exchange plate, exchanges heat with the heat exchange airflow in the airflow channel, and is then transported back to the carriage from the air outlet end.

[0012] In some embodiments of this application, a first ventilation baffle and a second ventilation baffle are formed in the main air duct. The main air duct, the first ventilation baffle, and the second ventilation baffle all extend along the length direction of the vehicle body. The first ventilation baffle is formed between the dynamic pressure chamber and the static pressure chamber, and the second ventilation baffle is formed between the static pressure chamber and the wind chamber.

[0013] In some embodiments of this application, the air inlet end of the airflow channel is connected to an air inlet fan, the first air inlet of the air inlet fan is connected to the carriage, and the air outlet end of the airflow channel is connected to the carriage through an air outlet pipe, wherein the heat exchange airflow passing through the ventilation gap flows in the opposite direction to the internal airflow passing through the airflow channel.

[0014] In some embodiments of this application, the air intake fan is also connected to the outside through a fresh air duct. The fresh air inlet of the fresh air duct is located at the top of the vehicle body. Fresh air is delivered to the airflow channel together with the internal airflow through the fresh air duct and the air intake fan.

[0015] In some embodiments of this application, a functional room is formed on the top of the carriage, the functional room is formed between the main air duct and the carriage, and the air intake fan and the air outlet duct are located in the functional room.

[0016] In some embodiments of this application, the carriage is also connected to an exhaust duct, which is connected to the outside and is used to exhaust some of the gas inside the carriage to the outside of the vehicle. The exhaust outlet of the exhaust duct is located below the vehicle body, and the exhaust outlet and the fresh air inlet are respectively located on opposite sides of the vehicle body.

[0017] In some embodiments of this application, the heat exchange unit includes a plurality of heat exchange plates spaced apart along the length of the vehicle body, each heat exchange plate being streamlined.

[0018] In some embodiments of this application, both the first ventilation barrier and the second ventilation barrier have a plurality of ventilation holes formed thereon.

[0019] In some embodiments of the present application, the dynamic pressure cavity is communicated with the air outlet of the air conditioner through a main air outlet pipe, and the return air cavity is communicated with the return air part of the air conditioner and the return air cavity through a main return air pipe.

[0020] In another aspect, the present application also provides a method for using the independent circulation air conditioning system, which comprises:

[0021] The air conditioner outputs the heat exchange air flow into the dynamic pressure cavity of the vehicle body, the heat exchange air flow flows along the dynamic pressure cavity, and is input into the static pressure cavity after passing through the first ventilation partition;

[0022] The static pressure cavity is provided with a plurality of heat exchange units, and each carriage of the vehicle body corresponds to at least one heat exchange unit, the internal air flow in the carriage enters the air flow channel of the heat exchange fin from the air inlet end corresponding to the heat exchange unit, and is output back to the carriage corresponding to the heat exchange unit after heat exchange with the heat exchange air flow;

[0023] The heat exchange air flow is output into the return air cavity after heat exchange with the corresponding heat exchange unit, and is finally output back to the air conditioner from the return air cavity.

[0024] Compared with the prior art, the present application has the following advantages and positive effects:

[0025] The independent circulation air conditioning system of the present application works in a way that each carriage is independently circulated, that is, each carriage corresponds to at least one heat exchange unit, and in the whole circulation process, the air conditioner unit and the carriage do not substantially exchange air, and only the heat exchange unit corresponding to each carriage exchanges heat; the air in each carriage is independently exchanged with the air conditioner unit through the heat exchange unit, which is beneficial to reduce the spread of viruses and bacteria between carriages, and is safer.

[0026] Each carriage corresponds to a separate fresh air pipe and exhaust pipe, new air is introduced through the fresh air pipe, and excess air in the carriage is discharged through the exhaust pipe, which is beneficial to keep the air in the carriage fresh.

[0027] Other features and advantages of the present application will become more apparent after reading the detailed description of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is a front view of an embodiment of the independent circulation air conditioning system proposed by the present application;

[0030] Figure 2 is a top view of an embodiment of the independent circulation air conditioning system proposed in the present application;

[0031] Figure 3 is a side view of the independent circulation air conditioning system;

[0032] Figure 4 is a flow schematic diagram of the heat exchange air flow and the internal air flow;

[0033] Figure 5 is a schematic diagram of the installation position of the heat exchange unit;

[0034] Figure 6 is a flow schematic diagram of the internal air flow in the heat exchange unit;

[0035] in the figure,

[0036] 100, vehicle body; 110, vehicle cabin; 111, fresh air inlet; 112, exhaust air pipeline; 113, roof; 1131, air outlet; 1132, air return inlet;

[0037] 120, main air duct; 121, dynamic pressure cavity; 122, static pressure cavity; 123, air return cavity; 124, first ventilation partition; 125, second ventilation partition;

[0038] 130, functional room;

[0039] 200, air conditioning unit; 210, main air outlet pipe; 220, main air return pipe;

[0040] 300, heat exchange unit; 310, heat exchange fin; 311, air flow passage;

[0041] 320, air inlet fan; 321, fresh air pipeline;

[0042] 330, air outlet pipeline. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] In the description of the application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the positions shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0045] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more.

[0046] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the application, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0049] Reference Figures 1-3The application provides an independent circulation air conditioning system which can be applied in a vehicle body 100 to realize independent air supply for each carriage 110 in the vehicle body 100 or applied in a building to realize independent air supply for each separate room in the building.

[0050] The independent circulation air conditioning system comprises the vehicle body 100, an air conditioning unit 200 and heat exchange units 300, the vehicle body 100 is formed with a plurality of carriages 110 along the length direction, the air conditioning unit 200 is installed at the head or tail of the vehicle body 100 and used for adjusting the temperature of each carriage 110 of the vehicle body 100, and the heat exchange units 300 are multiple in number, specifically, each carriage 110 corresponds to at least one heat exchange unit 300.

[0051] Of course, in order to improve the refrigeration or heating effect, one carriage 110 can also be connected with multiple heat exchange units 300.

[0052] The vehicle body 100 is also formed with a main air duct 120, the main air duct 120 is located at the top of the vehicle body 100, and a functional chamber 130 is arranged between the main air duct 120 and the carriage 110 and used for installing a fan, a pipeline and other working components.

[0053] Specifically, the main air duct 120 is divided into a dynamic pressure cavity 121, a static pressure cavity 122 and a return air cavity 123, the dynamic pressure cavity 121 is directly communicated with the air outlet of the air conditioning unit 200, and the heat exchange airflow output from the air conditioning unit 200 is directly output into the dynamic pressure cavity 121.

[0054] Each heat exchange unit 300 is arranged in the static pressure cavity 122 along the length direction of the static pressure cavity 122, and specifically, is located above the corresponding carriage 110 and communicated with the corresponding carriage 110.

[0055] The airflow in the dynamic pressure cavity 121 enters the static pressure cavity 122, is heat exchanged by the heat exchange unit 300 in the static pressure cavity 122 and then is output back to the air return part of the air conditioning unit 200 from the return air cavity 123.

[0056] Specifically, the air conditioning unit 200 comprises an air conditioner, the air outlet of the air conditioner is communicated with the dynamic pressure cavity 121, and the air return part of the air conditioner is communicated with the return air cavity 123.

[0057] The air conditioner fills the whole air supply duct with the processed heat exchange airflow through the dynamic pressure cavity 121.

[0058] Each carriage 110 is connected with at least one heat exchange unit 300, the heat exchange unit 300 is located in the static pressure cavity 122 and communicated with the dynamic pressure cavity 121 and the return air cavity 123 respectively.

[0059] The heat exchange unit 300 comprises a plurality of heat exchange fins 310 arranged at intervals along the length direction of the vehicle body 100, and a ventilation gap is formed between adjacent heat exchange fins 310.

[0060] The air flow in the dynamic pressure cavity 121 passes through the ventilation gap and enters the return air cavity 123.

[0061] Each heat exchange fin 310 is formed with an air flow passage 311, and the air inlet end and the air outlet end of the air flow passage 311 are respectively communicated with the corresponding vehicle compartment 110.

[0062] In some embodiments of the present application, in order to improve the heat exchange efficiency between the internal air flow in the heat exchange fin 310 and the heat exchange air flow outside the heat exchange fin 310, each heat exchange fin 310 is streamlined, and the streamlined heat exchange fin 310 can form a streamlined ventilation gap. Therefore, the length of the flow path of the heat exchange air flow and the internal air flow in the heat exchange unit 300 is increased, which is beneficial to increase the heat exchange time and improve the heat exchange effect.

[0063] The heat exchange air flow output from the air conditioner enters the static pressure cavity 122 after entering the dynamic pressure cavity 121, passes through the air flow passage 311 and is output to the return air cavity 123, and is finally input back to the air conditioner.

[0064] The internal air flow in the vehicle compartment 110 enters the air flow passage 311 from the air inlet end of the heat exchange fin 310, exchanges heat with the heat exchange air flow in the air flow passage 311, and is then input back to the vehicle compartment 110 from the air outlet end.

[0065] Specifically, at least one group of air outlets 1131 and air return outlets 1132 are arranged on the top plate 113 of the vehicle compartment 110, the air outlets 1131 are connected with the corresponding air inlet fans 320, and the air return outlets 1132 are connected with the corresponding air outlet ducts 330.

[0066] The heat exchange air flow in the static pressure cavity 122 is pushed by the pressure, passes through the ventilation gap and enters the return air cavity 123, which is the only path to ensure sufficient heat exchange. After heat exchange, the heat exchange air flow in the return air cavity 123 is sucked into the air conditioner for reprocessing to complete the main circulation.

[0067] Specifically, during heating, the air outlet part of the air conditioner outputs high-temperature heat exchange air flow, and the internal air flow with low temperature in the vehicle compartment 110 is heated after heat exchange with the heat exchange air flow transported from the ventilation gap in the air flow passage 311, and is then input back to the vehicle compartment 110 to heat the vehicle compartment 110.

[0068] During cooling, the air outlet part of the air conditioner outputs low-temperature heat exchange air flow, and the internal air flow with high temperature in the vehicle compartment 110 is cooled after heat exchange with the low-temperature heat exchange air flow in the air flow passage 311, and is then input back to the vehicle compartment 110 to cool the vehicle compartment 110.

[0069] For a more detailed description, please refer toFigure 5 The main air duct 120 is formed with a first air baffle 124 and a second air baffle 125, and the main air duct 120, the first air baffle 124 and the second air baffle 125 all extend along the length direction of the vehicle body 100, the first air baffle 124 is formed between the dynamic pressure cavity 121 and the static pressure cavity 122, and the second air baffle 125 is formed between the static pressure cavity 122 and the return air cavity 123.

[0070] The first air baffle 124 and the second air baffle 125 are both dispersedly formed with a plurality of air holes, the heat exchange airflow is transported into the static pressure cavity 122 from the air holes on the first air baffle 124, and after heat exchange with the internal airflow in the airflow channel 311, the heat exchange airflow is transported into the return air cavity through the air holes on the second air baffle 125.

[0071] With reference to Figures 4-6 The internal airflow in the vehicle cabin 110 is transported into the airflow channel 311 by the fan, specifically, the air inlet end of the airflow channel 311 is connected with an air inlet fan 320, the air inlet fan 320 is installed in the functional room 130 below the main air duct 120, the air inlet of the air inlet fan 320 is communicated with the vehicle cabin 110, and the air outlet end of the airflow channel 311 is communicated with the vehicle cabin 110 through an air outlet pipeline 330.

[0072] The air inlet end of the airflow channel 311 is located at one end far away from the dynamic pressure cavity 121, and the air outlet end is located at one end close to the dynamic pressure cavity 121, the heat exchange airflow passing through the air gap and the internal airflow passing through the airflow channel 311 flow in opposite directions, which is beneficial to improve the temperature difference between the inside and outside of the heat exchange fin in the heat exchange process and ensure the heat exchange efficiency.

[0073] The internal airflow in the vehicle cabin 110 and the heat exchange airflow in the main air duct 120 perform heat exchange without mass exchange, which ensures the heat exchange temperature difference of each link and improves the heat exchange efficiency.

[0074] The air inlet fan 320 and the air outlet pipeline 330 are both installed in the functional room 130, and the functional room 130 is located between the vehicle cabin 110 and the main air duct 120.

[0075] The air inlet fan 320 is also communicated with the outside through a fresh air pipeline 321, and a fresh air inlet 111 of the fresh air pipeline 321 is located at the top of the vehicle body 100, the outside fresh air passes through the fresh air pipeline 321 and the air inlet fan 320 and is transported into the airflow channel 311 together with the internal airflow.

[0076] The heat exchange unit 300 forms negative pressure through the driving of the air inlet fan 320, absorbs the internal airflow from the vehicle cabin 110, forms mixed air with the outside fresh air, enters the heat exchange unit 300 to perform heat exchange, and is sent back into the vehicle cabin 110, thereby completing the independent circulation of the airflow heat exchange in the vehicle cabin 110.

[0077] Referring again to Figures 1-3 In order to balance the air pressure in the car 110, the car 110 is also connected with an exhaust pipeline 112, which is connected with the outside, for exhausting part of the air in the car 110 to the outside of the vehicle body 100.

[0078] The exhaust pipeline 112 is located at the bottom of the side opposite to the fresh air inlet 111, and an adjustable exhaust fan (not shown) is arranged on the exhaust pipeline 112, for exhausting the exhaust air in the car 110.

[0079] Further, a sterilization device can be arranged at the input end of the exhaust pipeline 112, for sterilizing the heat exchange air in the car 110 before discharging to the atmosphere, to avoid pollution.

[0080] The exhaust port of the exhaust pipeline 112 is located below the vehicle body 100, and the exhaust port and the fresh air inlet 111 are located at opposite sides of the vehicle body 100.

[0081] The fresh air inlet 111 is located at the roof, and the exhaust port and the fresh air inlet 111 are located at opposite sides of the vehicle body 100, so that the exhaust port and the fresh air inlet 111 are far away from each other, avoiding the exhaust air from the car 110 entering the fresh air inlet 111.

[0082] Referring again to Figure 1 The dynamic pressure cavity 121 and the air outlet of the air conditioner are connected through a main air outlet pipeline 210, and the air return of the air conditioner and the air return cavity 123 are connected through a main air return pipeline 220.

[0083] The application also provides a use method of the independent circulation air conditioning system. The air conditioner installed in the vehicle body 100 outputs the heat exchange air processed by the air conditioner to the dynamic pressure cavity 121 of the vehicle body 100, and the heat exchange air flows along the dynamic pressure cavity 121 and is input into the static pressure cavity 122 after passing through the first ventilation partition 124.

[0084] A plurality of heat exchange units 300 are arranged in the static pressure cavity 122, and each car 110 of the vehicle body 100 corresponds to at least one heat exchange unit 300. The internal air in the car 110 enters the air flow channel 311 of the heat exchange fin 310 from the air inlet end of the corresponding heat exchange unit 300, exchanges heat with the heat exchange air, and is output to the corresponding car 110 from the air outlet end.

[0085] The heat exchange air exchanges heat with the corresponding heat exchange unit 300 and is output to the air return cavity 123, and is finally output to the air conditioner from the air return cavity 123.

[0086] The use method of the independent circulation air conditioning system can realize independent circulation of the heat exchange air and the internal air in the car 110, and complete heat exchange without mass exchange.

[0087] In addition to being communicated with the carriage 110 through the air inlet fan 320, the heat exchange unit 300 is also communicated with a fresh air pipeline 321, the fresh air pipeline 321 is mixed with the internal airflow in the carriage 110 and then enters the heat exchange unit 300 to exchange heat with the heat exchange airflow, so that the fresh air and the waste gas are replaced, the air temperature and humidity of the independent space are ensured to be suitable, the air is fresh, the virus and bacteria transmission path between the independent spaces under the same central ventilation system is cut off, and the health and safety of the personnel are ensured.

[0088] In the description of the above-described embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0089] The above merely describes specific implementations of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application, therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An independent circulating air conditioning system, characterized in that, include: The vehicle body has multiple compartments formed along its length, and a main air duct is also formed inside the vehicle body. The main air duct is divided into a dynamic pressure chamber, a static pressure chamber, and a return air chamber. An air conditioning unit is installed on the top of one end of the vehicle body, including an air conditioner, wherein the air outlet of the air conditioner is connected to the dynamic pressure chamber, and the air return section of the air conditioner is connected to the air return chamber; Each of the aforementioned carriages is connected to at least one heat exchange unit. The heat exchange unit is located within the static pressure chamber and is connected to the dynamic pressure chamber and the return air chamber, respectively. Each heat exchange unit includes multiple heat exchange plates, and ventilation gaps are formed between adjacent heat exchange plates to allow heat exchange airflow within the static pressure chamber. Each heat exchange plate has an airflow channel, and the air inlet and outlet of the airflow channel are connected to the corresponding carriage to allow internal airflow within the carriage. The heat exchange airflow output from the air conditioner enters the dynamic pressure chamber and then enters the static pressure chamber. After passing through the ventilation gap, it is output to the return air chamber and finally returned to the air conditioner. The internal airflow inside the carriage enters the airflow channel from the air inlet end of the heat exchange plate, exchanges heat with the heat exchange airflow in the airflow channel, and is then transported back to the carriage from the air outlet end.

2. The independent circulating air conditioning system according to claim 1, characterized in that, A first ventilation baffle and a second ventilation baffle are formed in the main air duct. The main air duct, the first ventilation baffle and the second ventilation baffle all extend along the length of the vehicle body. The first ventilation baffle is formed between the dynamic pressure chamber and the static pressure chamber, and the second ventilation baffle is formed between the static pressure chamber and the return air chamber.

3. The independent circulating air conditioning system according to claim 1, characterized in that, The air inlet end of the airflow channel is connected to an air inlet fan, the first air inlet of the air inlet fan is connected to the carriage, and the air outlet end of the airflow channel is connected to the carriage through an air outlet pipe. The heat exchange airflow passing through the ventilation gap flows in the opposite direction to the internal airflow passing through the airflow channel.

4. The independent circulating air conditioning system according to claim 3, characterized in that, The air intake fan is also connected to the outside through a fresh air duct. The fresh air inlet of the fresh air duct is located at the top of the vehicle body. Fresh air is delivered to the airflow channel along with the internal airflow through the fresh air duct and the air intake fan.

5. The independent circulating air conditioning system according to claim 3, characterized in that, A functional room is formed on the top of the carriage, between the main air duct and the carriage, and the air intake fan and the air outlet duct are located in the functional room.

6. The independent circulating air conditioning system according to claim 4, characterized in that, The carriage is also connected to an exhaust duct, which is connected to the outside and is used to exhaust some of the gas inside the carriage to the outside of the vehicle. The exhaust outlet of the exhaust duct is located below the vehicle body, and the exhaust outlet and the fresh air inlet are located on opposite sides of the vehicle body.

7. The independent circulating air conditioning system according to claim 1, characterized in that, The heat exchange unit includes a plurality of heat exchange plates spaced apart along the length of the vehicle body, and each heat exchange plate is streamlined.

8. The independent circulating air conditioning system according to claim 2, characterized in that, Both the first ventilation barrier and the second ventilation barrier have a number of ventilation holes distributed on them.

9. The independent circulating air conditioning system according to claim 1, characterized in that, The dynamic pressure chamber is connected to the air outlet of the air conditioner via a main air outlet pipe, and the return air chamber is connected to the return air section of the air conditioner via a main return air pipe.

10. A method of using an independent circulation air conditioning system, applied to the independent circulation air conditioning system according to any one of claims 1-9, characterized in that, include: The air conditioner outputs heat exchange airflow into the dynamic pressure chamber of the vehicle body. The heat exchange airflow flows along the dynamic pressure chamber and enters the static pressure chamber after passing through the first ventilation baffle. Multiple heat exchange units are installed in the static pressure chamber. Each compartment of the vehicle body has at least one corresponding heat exchange unit. The internal airflow in the compartment enters the airflow channel of the heat exchange plate from the air inlet end of the corresponding heat exchange unit. After exchanging heat with the heat exchange airflow, it is returned to the corresponding compartment from the air outlet end. After the heat exchange airflow passes through the corresponding heat exchange unit, it is output to the return air cavity and finally returned to the air conditioner from the return air cavity.

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