CO2 Reduction System and Control Method for Air Conditioning Units of Rail Vehicles

Abstract

This invention discloses a CO2 reduction system and control method for air conditioning units in rail vehicles, relating to the field of rail vehicle air conditioning technology. The CO2 reduction system for rail vehicle air conditioning units includes: an air outlet for the air conditioning unit; a CO2 adsorption unit connected to the air outlet along a first direction; an airflow switching unit connected to the CO2 adsorption unit along the first direction; a temperature control unit disposed in the CO2 adsorption unit and electrically connected to both the CO2 adsorption unit and the airflow switching unit; and a gas concentration sensor disposed in the airflow switching unit, near the CO2 adsorption unit. This invention solves the problem of a large proportion of fresh air load and a large volume of fresh air in the energy consumption of existing rail vehicle air conditioning systems.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning technology for rail vehicles, and in particular to a CO2 reduction system and control method for air conditioning units in rail vehicles. Background Technology

[0002] The per capita fresh air volume requirement in vehicles is high. The per capita fresh air volume is mainly determined by the allowable concentration of CO2 in the passenger compartment and the amount of CO2 exhaled by the human body. Against this background, how to reduce the per capita fresh air volume by reducing the CO2 concentration in the vehicle to reduce the energy consumption of the air conditioning system will become one of the research directions of the rail air conditioning industry.

[0003] Currently, the fresh air load of rail vehicle air conditioning is a component of the overall air conditioning load, typically accounting for 30%-60%, and even exceeding 60% in winter. This high proportion results in a significant portion of rail vehicle air conditioning energy consumption being comprised of fresh air, highlighting the problem of large fresh air volume. No effective solution has yet been proposed to address these issues.

[0004] In the prior art, application number 201720223867.2 involves purifying indoor carbon dioxide by installing a purification component with a polyacrylonitrile-based activated carbon fiber layer in front of the fan coil unit on the air intake side of a central air conditioning system; although this improves the physical adsorption capacity of carbon dioxide, the purification component still needs to be replaced regularly, which creates a logistical burden.

[0005] Application number 202020328321.5 involves carbon dioxide purification equipment that uses carbon dioxide purification bags and is equipped with corresponding detection instruments. It solves the technical problem of a sharp increase in carbon dioxide concentration in the carriage when a power outage occurs in a high-speed train. However, the carbon dioxide purification bags still need to be replaced regularly, which also causes a great logistical burden. Summary of the Invention

[0006] Purpose of the invention: To provide a CO2 reduction system and its control method for air conditioning units in rail vehicles, so as to solve the above-mentioned problems existing in the prior art.

[0007] Technical solution: A CO2 reduction system for rail vehicle air conditioning units, comprising: an air outlet of the air conditioning unit; a CO2 adsorption unit connected to the air outlet of the air conditioning unit along a first direction; an airflow switching unit connected to the CO2 adsorption unit along the first direction; a temperature control unit disposed in the CO2 adsorption unit and electrically connected to both the CO2 adsorption unit and the airflow switching unit; and a gas concentration sensor disposed in the airflow switching unit and close to the CO2 adsorption unit; when the gas concentration sensor feeds back the detected CO2 concentration value to the temperature control unit, the temperature control unit sends a control signal based on the received CO2 concentration value to control the operation of the CO2 adsorption unit and / or the airflow switching unit to eliminate or reduce CO2.

[0008] Preferably, the bottom of the air supply outlet of the air conditioning unit is provided with several air return ports, which are electrically connected to the temperature control unit.

[0009] Preferably, the CO2 adsorption unit includes: a first housing connected to the air outlet of the air conditioning unit, wherein a plurality of heat dissipation substrates perpendicular to the air intake direction are arranged in an array inside the first housing, and carbon fiber heating wires are arranged on the heat dissipation substrates, and the carbon fiber heating wires are electrically connected to the temperature control unit.

[0010] Preferably, the heat dissipation substrate is a perforated aluminum alloy heat dissipation substrate with a thickness of 2-8mm.

[0011] Preferably, the carbon fiber heating filament tube is a hollow fiber membrane with a length of 5-10 mm and an outer diameter of less than 1 mm.

[0012] Preferably, the airflow switching unit includes: a second housing connected to the CO2 adsorption unit, the bottom of the second housing having an in-vehicle air return port, and the side of the second housing away from the CO2 adsorption unit having an external exhaust port.

[0013] Preferably, the in-vehicle air return port is provided with a plurality of first multi-blade rotating structures, and the in-vehicle exhaust port is provided with a plurality of second multi-blade rotating structures.

[0014] Preferably, both the first multi-blade rotating structure and the second multi-blade rotating structure include: a stepper motor connected to the inner wall of the second housing, the stepper motor being electrically connected to the temperature control unit, the output end of the stepper motor being provided with a rotating shaft, the rotating shaft being provided with blades, and the blades having chamfers on both sides of their edges, the chamfers having the same inclination direction.

[0015] Preferably, the number of CO2 adsorption units is at least two sets.

[0016] To achieve the above objectives, according to another aspect of this application, a CO2 reduction control method for rail vehicle air conditioning units is also provided.

[0017] The CO2 reduction control method for rail vehicle air conditioning units according to this application includes the following steps:

[0018] The CO2 concentration in the airflow switching unit space is detected in real time using a gas concentration sensor;

[0019] The temperature control unit determines the CO2 concentration value based on the feedback from the gas concentration sensor and compares it with a preset concentration threshold.

[0020] If the CO2 concentration is lower than the preset concentration threshold, the temperature control unit sends a control signal to open the in-vehicle return air port of the airflow switching unit, close the out-of-vehicle exhaust port of the airflow switching unit, and completely or partially close the air conditioning return air port. CO2 gas continuously and orderly passes through the CO2 adsorption unit for adsorption to purify CO2 gas. At this time, the CO2 adsorption unit is in an unsaturated adsorption state.

[0021] If the CO2 concentration is higher than the preset concentration threshold, the temperature control unit sends a control signal to close the in-vehicle return air port of the airflow switching unit, open the out-of-vehicle exhaust port of the airflow switching unit, fully or partially open the air conditioning return air port, and heat the carbon fiber heating wire tube in the CO2 adsorption unit. The CO2 in the adsorption material is released by heating and discharged to the outside of the vehicle until the CO2 concentration after desorption is lower than the preset threshold. At this time, the CO2 adsorption unit is in a saturated desorption state.

[0022] Beneficial effects: In this embodiment, an integrated CO2 adsorption unit is used. When the gas concentration sensor feeds back the detected CO2 concentration value to the temperature control unit, the temperature control unit sends a control signal to control the CO2 adsorption unit and / or the airflow switching unit to operate according to the received CO2 concentration value, so as to eliminate or reduce CO2, thereby achieving the purpose of CO2 adsorption and desorption, and thus realizing the technical effect of automatically adjusting the CO2 concentration. This solves the technical problem of the large proportion of fresh air load and large fresh air volume in the energy consumption of existing rail vehicle air conditioning. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the CO2 reduction system for rail vehicle air conditioning units of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the CO2 reduction system for rail vehicle air conditioning units of the present invention;

[0025] Figure 3This is a schematic diagram of the internal three-dimensional structure of the airflow switching unit of the CO2 reduction system for rail vehicle air conditioning units of the present invention;

[0026] Figure 4 This is a partial three-dimensional schematic diagram of the multi-blade rotating structure of the CO2 reduction system for rail vehicle air conditioning units of the present invention;

[0027] Figure 5 This is a partial plan view of the semi-open multi-blade rotating structure of the CO2 reduction system for rail vehicle air conditioning units of the present invention;

[0028] Figure 6 This is a partial plan view of the fully open multi-blade rotating structure of the CO2 reduction system for rail vehicle air conditioning units of the present invention;

[0029] Figure 7 This is a schematic diagram of the blades of the multi-blade rotating structure of the CO2 reduction system for rail vehicle air conditioning units of the present invention.

[0030] The attached figures are labeled as follows: 10, air supply vent of the air conditioning unit; 101, air return vent of the air conditioning unit; 20, CO2 adsorption unit; 201, first housing; 202, heat dissipation base plate; 203, carbon fiber heating wire tube; 30, airflow switching unit; 301, second housing; 302, in-vehicle air return vent; 303, out-of-vehicle exhaust vent; 304, first multi-blade rotating structure; 305, second multi-blade rotating structure; 306, stepper motor; 307, rotating shaft; 308, blade; 309, chamfer; 40, temperature control unit. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] like Figure 1-2 As shown, this application relates to a CO2 reduction system and control method for an air conditioning unit in a rail vehicle. The CO2 reduction system for the rail vehicle air conditioning unit includes: an air supply outlet 10; the air supply outlet 10 is a device used to distribute cold or warm air into the room, achieving good air supply effect.

[0036] The CO2 adsorption unit 20 is connected to the air outlet 10 of the air conditioning unit along a first direction; it can achieve good CO2 adsorption and desorption effects, thereby achieving good gas purification effects. Here, the first direction refers to the air inlet direction; it can achieve good gas reception and purification effects. Of course, the adsorption effect can be improved by increasing the path distance of the CO2 adsorption unit 20.

[0037] The airflow switching unit 30 is connected to the CO2 adsorption unit 20 along the first direction; it can achieve a good airflow switching effect, thereby enabling the selection of the corresponding airflow operation state according to different working conditions, and thus achieving a good gas flow direction control effect.

[0038] A temperature control unit 40 is disposed in the CO2 adsorption unit 20 and electrically connected to both the CO2 adsorption unit 20 and the airflow switching unit 30. By providing the temperature control unit 40, a good temperature control effect can be achieved, thereby enabling the control of the operation of other components according to the actual usage state, and thus achieving multiple functions.

[0039] A gas concentration sensor is installed in the airflow switching unit 30 and close to the CO2 adsorption unit 20. It can achieve good CO2 concentration detection effect, thereby obtaining the real-time CO2 concentration status, and thus providing an accurate data basis for the processing and control of the temperature control unit 40.

[0040] When the gas concentration sensor feeds back the detected CO2 concentration value to the temperature control unit 40, the temperature control unit 40 issues a control signal based on the received CO2 concentration value to control the operation of the CO2 adsorption unit 20 and / or the airflow switching unit 30, thereby eliminating or reducing CO2. The gas concentration sensor detects the CO2 concentration in real time and converts the CO2 concentration value into a digital signal recognizable by the temperature control unit 40. Based on the feedback real-time digital signal, the temperature control unit 40 issues a control signal to control the operation of the CO2 adsorption unit 20 and the airflow switching unit 30, thus achieving a good CO2 treatment effect.

[0041] Specifically, when CO2 inside the rail vehicle passes through the onboard air conditioning system, it can be directly removed or reduced to the required level by the adsorption material integrated into the components before being sent into the vehicle. Once the CO2 adsorption capacity reaches saturation, the adsorbed CO2 can be released directly outside the vehicle through heating. The continuous elimination and purification effect of CO2 gas is achieved through the alternating operation of the dual components.

[0042] This application employs a low-air-resistance design, allowing direct coupling into the ventilation ducts of air conditioning unit systems; it significantly reduces the fresh air volume required to lower CO2 concentration, thereby substantially reducing the fresh air load on the air conditioning system. Simultaneously, this application features a low lower limit for CO2 adsorption concentration, high adsorption efficiency, low overall air resistance, and low energy consumption for the regeneration and recycling of the adsorption material.

[0043] As can be seen from the above description, this application achieves the following technical effects:

[0044] In this embodiment, an integrated CO2 adsorption unit 20 is used. When the gas concentration sensor feeds back the detected CO2 concentration value to the temperature control unit 40, the temperature control unit 40 sends a control signal to control the CO2 adsorption unit 20 and / or the airflow switching unit 30 to operate, so as to eliminate or reduce CO2, thereby achieving the purpose of CO2 adsorption and desorption. This achieves the technical effect of automatically adjusting the CO2 concentration, and solves the technical problem of a large proportion of fresh air load and a large amount of fresh air in the energy consumption of existing rail vehicle air conditioning systems.

[0045] Furthermore, the bottom of the air supply outlet 10 of the air conditioning unit is provided with several air return outlets 101, which are electrically connected to the temperature control unit 40. It can be understood that by providing several air return outlets 101, the effect of directional air delivery from the air supply outlet can be achieved, thereby improving gas handling efficiency.

[0046] Furthermore, the CO2 adsorption unit 20 includes: a first housing 201 connected to the air outlet 10 of the air conditioning unit; a plurality of heat dissipation substrates 202 arranged in an array within the first housing 201, perpendicular to the air inlet direction; carbon fiber heating wire tubes 203 disposed on the heat dissipation substrates 202; and the carbon fiber heating wire tubes 203 electrically connected to the temperature control unit 40. It can be understood that by arranging a plurality of heat dissipation substrates 202 in an array within the first housing 201 and sequentially arranged along the air inlet direction, a good heat dissipation effect can be achieved; simultaneously, the carbon fiber heating wire tubes 203 disposed on the heat dissipation substrates 202 can achieve a good heating effect, thereby achieving a good desorption effect.

[0047] Furthermore, the heat dissipation substrate 202 is a perforated aluminum alloy heat dissipation substrate 202, and the thickness of the perforated aluminum alloy heat dissipation substrate 202 is 2-8mm. It can be understood that by adopting a perforated design, it is possible to facilitate the installation of other components; at the same time, the thickness of the perforated aluminum alloy heat dissipation substrate 202 is 2-8mm, allowing for the selection of various specifications while ensuring good heat dissipation. For example, it can be easily filled into all spaces of the adsorption device, similar to a molecular sieve.

[0048] Furthermore, the carbon fiber heating filament 203 is a hollow fiber membrane with a length of 5-10 mm and an outer diameter of less than 1 mm. It is understood that by using a hollow fiber membrane, good permeation and separation effects can be achieved.

[0049] Specifically, hollow fiber membranes achieve permeation and separation of substances between the inside and outside of the membrane. Substances can be sieved through the micropores or semi-permeable membrane; depending on molecular size or other properties, some substances can pass through the membrane, while others are blocked outside.

[0050] like Figure 3-6 As shown, the airflow switching unit 30 includes a second housing 301 connected to the CO2 adsorption unit 20. The bottom of the second housing 301 has an in-vehicle air return port 302, and the side of the second housing 301 away from the CO2 adsorption unit 20 has an external exhaust port 303. It can be understood that by providing the in-vehicle air return port 302 and the external exhaust port 303 on the second housing 301 respectively, the effect of directional gas flow can be achieved, thereby ensuring the achievement of the corresponding functional effects.

[0051] Furthermore, the in-vehicle air return port 302 is provided with several first multi-blade rotating structures 304, and the external exhaust port 303 is provided with several second multi-blade rotating structures 305. It can be understood that by employing multi-blade rotating structures, the effect of switching between multiple states according to usage requirements can be achieved, thus enabling the selection of multiple states; for example, fully open or partially open.

[0052] like Figure 7 As shown, both the first multi-blade rotating structure 304 and the second multi-blade rotating structure 305 include a stepper motor 306 connected to the inner wall of the second housing 301. The stepper motor 306 is electrically connected to the temperature control unit 40. A rotating shaft 307 is provided at the output end of the stepper motor 306. Blades 308 are provided on the rotating shaft 307. Chamfers 309 are provided on both sides of the edge of each blade 308, and the inclination directions of the chamfers 309 are consistent. It can be understood that by using a micro stepper motor 306 to precisely control the blades 308, the angle of the blades 308 can be precisely adjusted, thereby achieving the desired rotation angle.

[0053] Specifically, the rotation angle of the louvers is controlled by a micro stepper motor 306. All louvers are stacked parallel to each other. When the louvers are perpendicular to the wind direction, they are in the closed state. When the louvers rotate to be parallel to the wind direction, they are in the open state during loading. In addition, the gas flow rate can also be adjusted by different opening degrees.

[0054] Furthermore, the number of CO2 adsorption units 20 is at least two sets. It is understood that by using at least two sets of CO2 adsorption units 20, continuous adsorption and desorption can be achieved, thus realizing uninterrupted gas treatment. This device is expected to reduce the fresh air volume by more than half, saving on the fresh air load of the air conditioning system.

[0055] Furthermore, the CO2 reduction system of this application has a loading space of 280L, with cross-sectional dimensions and shape consistent with existing air conditioners, and incorporates aerodynamic conformal design to avoid increasing air resistance during high-speed train operation. The carbon fiber heating wire has a rated power of 1-5kW.

[0056] This application also relates to a CO2 reduction control method for air conditioning units in rail vehicles, including the following steps:

[0057] The CO2 concentration in the space of the airflow switching unit 30 is detected in real time by a gas concentration sensor; good gas monitoring effect can be achieved by real-time detection of the CO2 concentration after adsorption.

[0058] The temperature control unit 40 compares the CO2 concentration value fed back by the gas concentration sensor with the preset concentration threshold, thus achieving a good CO2 concentration value judgment effect and providing a basis for subsequent control.

[0059] If the CO2 concentration is lower than the preset concentration threshold, the temperature control unit 40 sends a control signal to control the airflow switching unit 30 to open the in-vehicle return air port 302, close the airflow switching unit 30 to close the external exhaust port 303, and completely or partially close the air conditioning return air port 101. CO2 gas continuously and orderly passes through the CO2 adsorption unit 20 for adsorption to purify CO2 gas. At this time, the CO2 adsorption unit 20 is in an unsaturated adsorption state.

[0060] If the CO2 concentration is higher than the preset concentration threshold, the temperature control unit 40 sends a control signal to close the in-vehicle return air port 302 of the airflow switching unit 30, open the out-of-vehicle exhaust port 303 of the airflow switching unit 30, fully or partially open the air conditioning return air port 101, and heat the carbon fiber heating wire tube 203 in the CO2 adsorption unit 20. The CO2 in the adsorption material is released by heating and discharged to the outside of the vehicle until the CO2 concentration after desorption is lower than the preset threshold. At this time, the CO2 adsorption unit 20 is in a saturated desorption state.

[0061] It is important to know that the threshold is represented as a critical value, which has a highest critical value and a lowest critical value. Therefore, when the threshold is preset, the temperature controller can judge against the preset threshold and issue accurate control commands to control other components to perform corresponding actions, thereby achieving the effect of CO2 adsorption or desorption process.

[0062] Furthermore, the adsorption and desorption processes can also employ two gas concentration sensors installed at both ends of the CO2 adsorption unit 20 to detect the CO2 concentration in the air. By collecting the CO2 concentration at both ends of the CO2 adsorption unit 20 and feeding the collected concentration values ​​back to the temperature control unit, the temperature control unit compares and judges based on preset parameter values, thereby enabling the temperature controller to perform corresponding actions. Therefore, this method can also achieve CO2 reduction.

[0063] For example, when CO2-containing gas in the vehicle enters the CO2 adsorption unit 20 through the air conditioning vent, the CO2 contained therein will be reduced or eliminated by the adsorption material to obtain clean gas with a CO2 concentration that meets the standard. At this time, the air conditioning system's own return air port 5 is completely or partially closed, the vehicle interior return air port 3028 is opened, and the vehicle exterior exhaust port 3039 is closed. The clean gas is directly returned to the passenger compartment for the people inside the vehicle to breathe.

[0064] Specifically, when the CO2 concentration in the air conditioning duct is 2500 ppm, the CO2 concentration in the purified gas is essentially zero when the adsorber is in the effective adsorption stage. As penetration begins, the concentration gradually increases. When the concentration exceeds the maximum concentration required in the vehicle compartment, such as 1500 ppm, it indicates that the CO2 adsorption material has adsorbed enough CO2 to reach saturation, or the adsorption rate can no longer meet the CO2 reduction requirements. At this point, the adsorption process stops, and the next step, heating desorption, begins.

[0065] Specifically, during the CO2 adsorption process cycle, the air conditioner's own return air port is closed, the in-vehicle return air port 302 of the airflow switching unit 30 is fully open, and the external exhaust port 303 is closed. All the air conditioning airflow passes through the adsorption unit before being returned to the passenger compartment. During the desorption process cycle, the air conditioner's own return air port is fully open, the in-vehicle return air port 302 of the airflow switching unit 30 is closed, and the external exhaust port 303 controls its opening. The adsorption unit begins heating and stabilizes at the set temperature. Most of the air is directly returned to the passenger compartment through the air conditioning duct, and a small portion of the airflow (e.g., 1 / 10) is sent to the CO2 adsorption unit 20 to purge the high concentration of CO2 generated during the desorption process. Once the CO2 concentration in the desorbed gas decreases to a specified value, the desorption process ends, and the next cycle of "adsorption-desorption" begins.

[0066] The temperature control unit 40 is used to control the operating temperature of the adsorbent material in the CO2 treatment unit.

[0067] The airflow switching unit 30 is used to switch the gas flow direction, so that the gas passing through the adsorption unit can be controlled to return to the vehicle or be discharged outside the vehicle. The airflow switching function is achieved by rotating the louver structure to open, close, or at different opening degrees.

[0068] At this time, the air conditioning vent return air inlet is fully or partially open, the external exhaust outlet 303 is open, and the internal air return outlet 302 is closed. The heating system starts working, and the temperature control unit 40 controls the carbon fiber heating wire tube 203 to start heating, so that the temperature of the adsorbent material is rapidly raised to the required temperature of 40-100℃. The adsorbent material filled in the CO2 adsorption unit 20 begins to release CO2, which is discharged outside the vehicle through the external exhaust outlet 303. Usually, when the effective desorption temperature is just reached, the CO2 concentration of the desorbed gas is very high, reaching ~10000ppm. However, as the desorption time increases, the CO2 concentration of the desorbed gas will gradually decrease. When it drops to the concentration of the original gas +500ppm, the desorption process can be stopped. At this time, the gas flow is maintained, the heating system is turned off, and a new round of "adsorption-desorption" cycle is started after a period of time.

[0069] The adsorption and desorption processes are performed alternately to eliminate or reduce CO2 gas inside the vehicle.

[0070] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A CO2 reduction system for air conditioning units in rail vehicles, characterized in that, include: Air supply outlet of air conditioning unit (10); The CO2 adsorption unit (20) is connected to the air outlet (10) of the air conditioning unit along the first direction; The airflow switching unit (30) is connected to the CO2 adsorption unit (20) along the first direction; A temperature control unit (40) is disposed in the CO2 adsorption unit (20) and electrically connected to both the CO2 adsorption unit (20) and the airflow switching unit (30); and A gas concentration sensor is disposed in the airflow switching unit (30) and close to the CO2 adsorption unit (20); When the gas concentration sensor feeds back the detected CO2 concentration value to the temperature control unit (40), the temperature control unit (40) sends a control signal to control the operation of the CO2 adsorption unit (20) and / or the airflow switching unit (30) according to the received CO2 concentration value, so as to eliminate or reduce CO2. The airflow switching unit (30) includes: a second housing (301) connected to the CO2 adsorption unit (20), the bottom of the second housing (301) is provided with an in-vehicle air return port (302), and the side of the second housing (301) away from the CO2 adsorption unit (20) is provided with an external exhaust port (303); The in-vehicle air return port (302) is provided with a plurality of first multi-blade rotating structures (304), and the in-vehicle exhaust port (303) is provided with a plurality of second multi-blade rotating structures (305). Both the first multi-blade rotating structure (304) and the second multi-blade rotating structure (305) include: a stepper motor (306) connected to the inner wall of the second housing (301), the stepper motor (306) being electrically connected to the temperature control unit (40), the output end of the stepper motor (306) being provided with a rotating shaft (307), the rotating shaft (307) being provided with blades (308), and the two sides of the edge of the blades (308) being provided with chamfers (309), the inclination directions of the chamfers (309) being consistent.

2. The CO2 reduction system for rail vehicle air conditioning units according to claim 1, characterized in that, The air supply outlet (10) of the air conditioning unit has several air return ports (101) at its bottom, and the air return ports (101) are electrically connected to the temperature control unit (40).

3. The CO2 reduction system for rail vehicle air conditioning units according to claim 1, characterized in that, The CO2 adsorption unit (20) includes: a first housing (201) connected to the air outlet (10) of the air conditioning unit, wherein a plurality of heat dissipation substrates (202) perpendicular to the air inlet direction are arranged in an array inside the first housing (201), and carbon fiber heating wire tubes (203) are arranged on the heat dissipation substrates (202), and the carbon fiber heating wire tubes (203) are electrically connected to the temperature control unit (40).

4. The CO2 reduction system for rail vehicle air conditioning units according to claim 3, characterized in that, The heat dissipation substrate (202) is a hollow aluminum alloy heat dissipation substrate (202), and the thickness of the hollow aluminum alloy heat dissipation substrate (202) is 2-8mm.

5. The CO2 reduction system for rail vehicle air conditioning units according to claim 3, characterized in that, The carbon fiber heating filament tube (203) is a hollow fiber membrane with a length of 5-10 mm and an outer diameter of less than 1 mm.

6. The CO2 reduction system for rail vehicle air conditioning units according to claim 1, characterized in that, The number of CO2 adsorption units (20) is at least two sets.

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