CN218519675U

CN218519675U - Rail vehicle and air conditioner dehumidification system thereof

Info

Publication number: CN218519675U
Application number: CN202221670780.7U
Authority: CN
Inventors: 侯新春; 魏跃文
Original assignee: Shanghai Cool Air Transport Refrigeration Equipment Co ltd
Current assignee: Shanghai Cool Air Transport Refrigeration Equipment Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2023-02-24
Anticipated expiration: 2032-06-30

Abstract

The utility model discloses a rail vehicle and air conditioner dehumidification system thereof, include: the compressor, the condenser, the throttling component and the evaporator are connected in sequence; the dehumidification branch is used for heating the air passing through the evaporator and is positioned between the evaporator and the blower; the inlet of the dehumidification branch is communicated with a pipeline between the exhaust end of the compressor and the inlet end of the throttling assembly, the outlet of the dehumidification branch is communicated with the inlet end of the throttling assembly or the suction end of the compressor, and the dehumidification branch is provided with a plurality of channels for communicating the inlet with the corresponding outlets. Make compressor exhaust high temperature refrigerant pass through in a plurality of passageways that the import got into the dehumidification branch road through above-mentioned setting, can make the holistic temperature of dehumidification branch road more even, avoid appearing the problem that local temperature crosses low excessively, carry out the heat transfer with the air through the evaporimeter and can make air temperature distribution even to can effectively reduce the difference in temperature, and then avoid the condensation problem, improve user's travelling comfort.

Description

Rail vehicle and air conditioner dehumidification system thereof

Technical Field

The utility model relates to a dehumidification technical field, in particular to rail vehicle and air conditioner dehumidification system thereof.

Background

The existing air conditioner needs continuous refrigeration because a large amount of moisture in the air needs to be removed during normal refrigeration during dehumidification. When the temperature in the vehicle cabin (or the indoor) reaches the target comfort temperature under the action of the air conditioner, the continuous cooling and dehumidification can cause the temperature in the vehicle cabin (or the indoor) to continuously decrease. Particularly, in the rainy season, under the condition of low temperature and high humidity, the comfort of passengers (or users) is affected by the low temperature in the compartment (or indoor) during dehumidification.

In consideration of comfort in the dehumidification mode, it is usually necessary to heat the air after condensation and dehumidification to reach a suitable temperature in the cabin (or room). In the current common mode, a branch is arranged at the discharge port of the compressor, and the high-temperature refrigerant discharged by the compressor is utilized to heat the air passing through the evaporator through the branch.

In the process of implementing the present invention, the inventor finds that there are at least the following problems in the prior art:

because the heat transfer of the high temperature refrigerant that the branch road discharged and the heat transfer of evaporimeter are single point heat transfer, for example with the top intercommunication heat transfer of evaporimeter: in the dehumidification process, high-temperature refrigerant is subjected to heat exchange from top to bottom, the temperature is gradually reduced, and the temperature of air heated in dehumidification is higher at the upper part of the evaporator and lower at the lower part of the evaporator. Therefore, the purposes of firstly cooling and dehumidifying the air and then heating the air during dehumidification are not achieved, and condensation can be generated due to large temperature difference of the upper air and the lower air of the evaporator. Blowing condensation into the passenger compartment (or room) can also affect passenger (or user) comfort.

Therefore, how to realize dehumidification while ensuring user comfort is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an air conditioner dehumidification system for realize the dehumidification when guaranteeing user's travelling comfort. Furthermore, the utility model also provides a rail vehicle who has above-mentioned air conditioner dehumidification system.

In order to achieve the above object, the utility model provides a following technical scheme:

an air conditioning dehumidification system, comprising:

the compressor, the condenser, the throttling assembly and the evaporator are sequentially connected, the outlet end of the evaporator is connected with the air suction end of the compressor, and the inlet end of the condenser is connected with the exhaust end of the compressor;

the dehumidification branch is used for heating the air passing through the evaporator and is positioned between the evaporator and the blower;

the inlet of the dehumidification branch is communicated with a pipeline between the exhaust end of the compressor and the inlet end of the throttling component, the outlet of the dehumidification branch is communicated with the inlet end of the throttling component or the suction end of the compressor, and the dehumidification branch is provided with a plurality of channels for communicating the inlet and the corresponding outlet.

Preferably, in the above air conditioning and dehumidifying system, the dehumidifying branch includes:

an input pipe having the inlet, the input pipe being in communication with a conduit between a discharge end of the compressor and an inlet end of the throttling assembly;

an output pipe having the outlet, the output pipe being in communication with an inlet end of the throttling assembly or with a suction end of the compressor;

the heat exchanger is provided with the channel, and the heat exchanger is attached to one side, close to the air blower, of the evaporator.

Preferably, in the air conditioning dehumidification system, the dehumidification branch further includes a first liquid separation head for communicating the heat exchanger with the input pipe, the input pipe is communicated with the first liquid separation head, and inlet ends of all channels of the heat exchanger are respectively communicated with the first liquid separation head through capillary tubes.

Preferably, in the above air conditioning and dehumidifying system, the input pipe is communicated with a pipeline between an output end of the condenser and an inlet end of the throttling assembly;

the output pipe is communicated with the inlet end of the throttling assembly, and the output pipe is closer to the throttling assembly than the input pipe.

Preferably, in the above air conditioning and dehumidifying system, the input pipe is communicated with a pipeline between a discharge end of the compressor and an input end of the condenser;

the output pipe is communicated with the air suction end of the compressor.

Preferably, the air conditioning and dehumidifying system further includes a control element for controlling on/off of the dehumidifying branch, the control element is mounted on the input pipe and/or the output pipe, and the control element includes an electromagnetic valve.

Preferably, in the above air conditioning and dehumidifying system, a liquid path control device is disposed between the condenser and the throttling assembly, and the liquid path control device includes an electromagnetic valve.

Preferably, in the air conditioning and dehumidifying system, the throttling component includes any one of a throttling valve, an electronic expansion valve, a thermal expansion pipe and a capillary tube.

Preferably, in the air conditioning and dehumidifying system, the evaporator includes:

the second liquid separation heads are communicated with inlets of the capillary tubes of the evaporators in a one-to-one correspondence manner;

the outlet of the capillary tube of the evaporator is communicated with the evaporator outlet tube, and the evaporator outlet tube is communicated with the air suction end of the compressor.

A rail vehicle comprises an air conditioning and dehumidifying system, wherein the air conditioning and dehumidifying system is any one of the air conditioning and dehumidifying systems.

The utility model provides an air conditioner dehumidification system, pipeline intercommunication between the import through the dehumidification branch road and the exhaust end of compressor and the entry end of throttle subassembly, and with the export of dehumidification branch road and the entry end of throttle subassembly or with the end intercommunication of breathing in of compressor, and the dehumidification branch road has a plurality of passageways with the import intercommunication, thereby make compressor exhaust high temperature refrigerant pass through in the import gets into a plurality of passageways of dehumidification branch road, can make the holistic temperature of dehumidification branch road will be more even, avoid appearing the problem that local temperature hangs down excessively, it can make air temperature distribution even to carry out the heat transfer with the air through the evaporimeter, thereby can effectively reduce the difference in temperature, and then avoid the condensation problem, user's travelling comfort has been improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an evaporator and a dehumidification branch of an air conditioning dehumidification system disclosed in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an air conditioning and dehumidifying system disclosed in an embodiment of the present invention;

wherein, 1 is a compressor, 2 is an evaporator, 3 is a blower, 4 is a dehumidification branch, 5 is a throttling component, 6 is a liquid path control device, 7 is a condensing fan, and 8 is a condenser;

21 is a second liquid separation head, and 22 is an evaporator outlet pipe;

41 is an input pipe, 42 is a first liquid separation head, 43 is an output pipe, 44 is a control element, and 45 is a heat exchanger.

Detailed Description

The utility model discloses an air conditioner dehumidification system for realize the dehumidification when guaranteeing user's travelling comfort. Furthermore, the utility model also discloses a rail vehicle of having above-mentioned air conditioner dehumidification system.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

As shown in fig. 1 and fig. 2, the utility model discloses an air-conditioning dehumidification system, including compressor 1, condenser 8, throttling assembly 5 and the evaporimeter 2 that connect gradually, wherein, the exit end of evaporimeter 2 is connected with the end of breathing in of compressor 1 to form the circulation pipeline of refrigerant, in order to accomplish air-conditioning dehumidification system's whole working process.

In order to improve comfort, a dehumidification branch 4 is added on the basis of the above structure, and the dehumidification branch 4 is located between the evaporator 2 and the blower 3 so as to heat the air passing through the evaporator 2. Specifically, the method comprises the following steps: air can be condensed on the surface of the evaporator 2 to generate water drops when passing through the surface of the evaporator 2, so that the aim of dehumidification is fulfilled, and the air temperature is lower; then the air with lower temperature continues to pass through the dehumidification branch 4 and completes the heating of the air; the heated air is finally sent into the vehicle compartment (or room) by the blower 3.

Since the air conditioning and dehumidifying system needs to be switched between different states during use, the air conditioning and dehumidifying system further comprises a control element 44 for controlling the on/off of the dehumidifying branch 4. Whether the dehumidifying branch 4 is used or not can be realized by the control of the control member 44, specifically, when the dehumidifying branch 4 is in operation, the dehumidifying process is performed, and when the dehumidifying branch 4 is not in operation, the normal operation process of the air conditioner is performed.

Through increase dehumidification branch road 4 on original air conditioning system in this application to in the dehumidification process, can heat the air after absorbing 2 cold volumes dehumidifies of evaporimeter, with avoid sending into the problem that the air temperature in the carriage (or indoor) is too low through forced draught blower 3, thereby when accomplishing refrigeration dehumidification, also can ensure the travelling comfort, promoted user's experience and felt.

In addition, the core of this application lies in, the pipeline intercommunication between the import with dehumidification branch 4 and compressor 1's exhaust end and the entry end of throttle subassembly, and with the export of dehumidification branch 4 and the entry end of throttle subassembly 5 or with the end intercommunication of breathing in of compressor 1, and the dehumidification branch has a plurality of passageways that are used for the intercommunication import and correspond the export, make compressor 1 exhaust high temperature refrigerant pass through in the import gets into a plurality of passageways in the dehumidification branch 4, can make the holistic temperature of dehumidification branch 4 more even, avoid appearing the problem that local temperature is low excessively, it can make air temperature distribute evenly to carry out the heat transfer with the air through evaporimeter 2, thereby can effectively reduce the difference in temperature, reduce the production of condensation, and then effectively reduce the condensation and blow in the carriage (or indoor), the travelling comfort of using has been improved, experience is better.

It should be noted that, for the plurality of channels provided above, it is most preferable to arrange all the channels uniformly along the height direction of the evaporator 2 to ensure more uniform heat exchange with the evaporator 2.

In a specific embodiment, the dehumidification branch 4 includes: an inlet pipe 41, an outlet pipe 43 and a heat exchanger 45. Wherein, the inlet of the dehumidification branch 4 is the inlet of the input pipe 41 and is communicated with the pipeline between the exhaust end of the compressor 1 and the inlet end of the throttling component 5; the outlet of the dehumidification branch 4 is the outlet of the output pipe 43 and is communicated with the inlet end of the throttling component 5 or the suction end of the compressor 1; the heat exchanger 45 with the channel is attached to one side of the evaporator 2 close to the blower 3, and a plurality of heat exchange ports are uniformly arranged along the height direction and/or the horizontal direction.

Specifically, each channel of the heat exchanger 45 has two heat exchange ports, i.e., the two heat exchange ports are respectively used as an inlet port and an outlet port of the channel, and a channel for liquid circulation is formed between the two heat exchange ports, as shown in fig. 1. When connected, the inlet port communicates with the inlet pipe 41 and the outlet port communicates with the outlet pipe 43, thereby forming a complete fluid path.

When the heat exchanger 45 in the present application has a plurality of passages, the heat exchange ports of the heat exchanger 45 are uniformly arranged in the height direction and/or the horizontal direction of the evaporator 2, and preferably, a plurality of heat exchange ports are arranged in the height direction. During the connection, all communicate with input tube 41 as the heat transfer mouth of entrance point in all passageways of this heat exchanger 45, simultaneously, all communicate with output tube 43 as the heat transfer mouth of exit end in all passageways of this heat exchanger 45, carry out the heat transfer based on many passageways of heat exchanger 45 evenly distributed, so can reduce the difference in temperature on whole heat exchanger 45 surface, make the air after the condensation of evaporimeter 2 everywhere when heat exchanger 45 approximately the same, and then avoided the condensation problem.

In the above embodiment, the dehumidification branch 4 is provided in a pipeline structure, and the input pipe 41 is communicated with the pipeline between the exhaust end of the compressor 1 and the inlet end of the throttling assembly 5, so that the refrigerant entering the input pipe 41 is in a high temperature state, the air passing through the evaporator 2 is heated, and the temperature of the air blown into the room is ensured to be at a proper temperature.

In practice, after the dehumidification branch 4 exchanges heat with the air passing through the evaporator 2, the temperature inside the heat exchange tube 45 will decrease, but since the heat required for raising the temperature of the air is less, the refrigerant in the dehumidification branch 4 can directly flow back to the suction end of the compressor 1 if it is a gaseous refrigerant; and when the refrigerant of the dehumidification branch 4 is a liquid refrigerant after heat dissipation, the heat exchange needs to be continued through the evaporator 2. To sum up, the output pipe 43 communicates with the inlet end of the throttling assembly 5 or with the suction end of the compressor 1.

The heat exchange pipe 45 is used to heat the air between the evaporator 2 and the blower 3, and its specific size and structure can be set according to different requirements as long as the above functions can be achieved.

For the convenience of control, a liquid path control device 6 is disposed between the condenser 8 and the throttling assembly 5 in the air conditioning and dehumidification system in the present application, and the liquid path control device 6 includes, but is not limited to, a solenoid valve. Automatic control can be realized by adopting the electromagnetic valve.

As shown in fig. 1 and 2, in the first embodiment, the input pipe 41 is connected to the pipeline between the output end of the condenser 8 and the inlet end of the throttling assembly 5, and the output pipe 43 is directly connected to the inlet end of the throttling assembly 5, so that the output pipe 43 is closer to the throttling assembly 5 than the input pipe 41.

During normal cooling mode, the closing control makes the dehumidification branch in the non-working state:

the liquid path electromagnetic valve 6 is opened, the compressor 1 compresses the refrigerant into high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed into high-temperature liquid refrigerant through the condenser 8, the high-temperature liquid refrigerant is changed into low-temperature low-pressure gas-liquid two-phase refrigerant through the throttling device 5, the low-temperature low-pressure gas-liquid two-phase refrigerant is subjected to heat exchange and evaporation through the evaporator 2 to form gaseous refrigerant, the gaseous refrigerant flows back to the compressor 1 to form a refrigeration cycle, and air is blown to the indoor space through the blower 3 after being cooled through the evaporator 2.

When refrigerating and dehumidifying, firstly, a control element is started to enable a dehumidifying branch to be in a working state:

the refrigerant is compressed by the compressor 1 and then becomes high-temperature high-pressure gas, and then when the gas flows through the condenser 8, the external air cools the refrigerant in the condenser 8 under the action of the axial flow fan 7 and becomes a high-temperature high-pressure liquid refrigerant; part of the high-temperature high-pressure liquid refrigerant discharged from the condenser 8 directly enters the evaporator 2 through the throttling component 5, is changed into a low-temperature low-pressure refrigerant gas-liquid mixed state after passing through the throttling component 5, then enters the evaporator 2, and the mixed air of indoor return air and outdoor fresh air absorbs the cold energy of the refrigerant in the evaporator 2 and simultaneously separates out water under the action of the blower 3, so as to achieve the purpose of dehumidification, in the process, the refrigerant in the evaporator 2 absorbs the heat of the mixed air and is changed into a gas state, and then returns to the compressor 1; the other part of the high-temperature and high-pressure liquid refrigerant discharged from the condenser 8 enters the heat exchanger 45 through the input pipe 41, exchanges heat with the dehumidified air at the heat exchanger 45 and one side of the evaporator 2 close to the blower 3, so that the air cooled and dehumidified by the evaporator 2 is heated and then sent into the room, and in the process, the refrigerant in the heat exchanger 45 dissipates heat, flows back to the inlet end of the throttling assembly 5 through the output pipe 43, enters the evaporator 2 through the throttling assembly 5, and finally flows back to the compressor 1, so that a dehumidification cycle is completed.

In the second embodiment, according to the indoor temperature and humidity, the input pipe 41 can be connected to the pipeline between the exhaust end of the compressor 1 and the input end of the condenser 8; while the delivery pipe 43 is in direct communication with the suction side of the compressor 1. When the high-temperature high-pressure gas refrigerant discharged by the compressor 1 directly enters the heat exchanger 45 through the input pipe 41 during operation, the high-temperature high-pressure gas refrigerant heats the air on the side of the evaporator 2 close to the blower 3, and when the heat energy required for temperature rise is less, the refrigerant in the heat exchanger 45 is still in a gas state, so that the refrigerant can directly flow back to the compressor 1 for circulation.

For the flow process of the refrigerant in the above connection manner, reference may be made to the flow in the first embodiment, and the difference is only that: the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 enters the input pipe 41, and the refrigerant in the output pipe 43 flows back to the suction end of the compressor 1.

In addition, when the refrigerant entering the input pipe 41 is liquid refrigerant, the output pipe 43 can be connected to other evaporator structures and then connected to the compressor 1, so as to ensure the integrity of the existing air conditioner structure.

It will be appreciated by those skilled in the art that in order to avoid the influence of liquid refrigerant on the compressor 1, it is preferable to connect the output pipe 43 to the inlet end of the throttling assembly 5.

It should be noted that, when the dehumidification branch 4 is in a pipeline structure, the control element 44 for controlling on/off of the pipeline may be an electromagnetic valve, so as to implement automatic control, and may also be a flow electromagnetic valve, a mechanical valve, or the like. Specifically, the control member 44 is installed on the input pipe 41 and/or the output pipe 43, so that when the dehumidified air needs to be heated in the dehumidification process, the connection between the input pipe 41 and the output pipe 43 is conducted; when the air is not required to be heated, the communication between the inlet pipe 41 and the outlet pipe 43 is cut off to avoid waste of energy.

In order to communicate the heat exchanger 45 with the input pipe 41, a first liquid dividing head 42 is provided in the present embodiment, and specifically, the first liquid dividing head 42 communicates with the inlet end of the channel of the heat exchanger 45 through a capillary tube. When connected, the first liquid separation head 42 is connected with a plurality of capillary tubes, and each capillary tube is correspondingly connected with the inlet end of one channel of the heat exchanger 45, as can be seen in fig. 1 and 2. Divide liquid and pass through capillary intercommunication input tube 41 and heat exchanger 45's passageway through first branch liquid head 42, can guarantee that the liquid of circulation is roughly the same in every passageway, guarantee the effect of heat transfer, avoid the problem of heat concentration.

As can be seen from fig. 2, the heat exchange ports of the heat exchange tube 45 are uniformly arranged along the height direction of the evaporator 2, the refrigerant in the input tube 41 can be transported into different heat exchange ports through the first liquid-separating head 42 and the capillary tube, and local heating of air is completed, by adopting the manner, the refrigerant can be uniformly distributed in the capillary tube and flows into the heat exchange tube 45 through the capillary tube, so that low-temperature air is uniformly heated from top to bottom, and comfort is further ensured. In summary, the first dispensing head 42 can be added in a preferred manner to further improve comfort.

On the basis of the technical scheme, the throttling component 5 involved in the application can be a throttling valve, an electronic expansion valve, a thermal expansion pipe or a capillary pipe. The specific structure of the throttling assembly 5 can be selected according to different requirements and is within the protection range.

As shown in fig. 1 and 2, the evaporator 2 referred to in the present application includes a second tap 21 communicating with the throttling assembly 5 and an evaporator outlet pipe 22 communicating with a suction end of the compressor 1. Wherein, the second liquid separation head 21 is correspondingly communicated with the inlets of the capillary tubes of the evaporator 2, and the outlets of the capillary tubes of the evaporator 2 are communicated with the evaporator outlet tube 22. That is, a specific structure of the evaporator 2 is defined herein, even if the low-temperature liquid refrigerant entering through the second liquid-separating head 21 is uniformly distributed in the evaporator 2, the temperature of each part of the evaporator 2 is ensured to be the same, and the occurrence of temperature difference is avoided.

In addition, the application also discloses a rail vehicle which comprises an air-conditioning dehumidification system, wherein the air-conditioning dehumidification system is the air-conditioning dehumidification system disclosed in the embodiment, so that the rail vehicle with the air-conditioning dehumidification system also has all the technical effects.

The application of the air conditioning and dehumidifying system on a railway vehicle is disclosed herein, and it can be understood by those skilled in the art that the air conditioning and dehumidifying system can be applied on a car or a room air conditioner.

As used in the present application and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be exhaustive or to include the plural as well, unless the context clearly indicates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements. An element defined by the phrase "comprising a component of ' 8230 ' \8230; ' does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air conditioning dehumidification system, comprising:

2. An air conditioning and dehumidifying system as claimed in claim 1, wherein the dehumidifying branch comprises:

an inlet pipe having the inlet, the inlet pipe communicating with a conduit between a discharge end of the compressor and an inlet end of the throttling assembly;

the heat exchanger is provided with the channel, and the heat exchanger is attached to one side, close to the air feeder, of the evaporator.

3. An air conditioning and dehumidifying system as claimed in claim 2, wherein the dehumidifying branch further comprises a first liquid dividing head for communicating the heat exchanger with the input pipe, the input pipe is communicated with the first liquid dividing head, and the inlet ends of all the channels of the heat exchanger are respectively communicated with the first liquid dividing head through capillary tubes.

4. An air conditioning and dehumidification system according to claim 2, wherein said input pipe communicates with a conduit between an output of said condenser and an inlet end of said throttling assembly;

the output pipe is communicated with the inlet end of the throttling component, and is closer to the throttling component than the input pipe.

5. An air conditioning and dehumidification system according to claim 2, wherein said input duct communicates with a conduit between a discharge end of said compressor and an input end of said condenser;

the output pipe is communicated with the air suction end of the compressor.

6. An air conditioning and dehumidifying system as claimed in claim 2, further comprising a control member for controlling on/off of said dehumidifying branch, said control member being mounted on said inlet pipe and/or said outlet pipe, and said control member comprising a solenoid valve.

7. An air conditioning and dehumidification system according to claim 2, wherein a liquid path control device is disposed between said condenser and said throttling assembly, said liquid path control device comprising a solenoid valve.

8. An air conditioning and dehumidification system according to any of claims 1 to 7, wherein said throttling assembly comprises any of a throttling valve, an electronic expansion valve, a thermal expansion tube and a capillary tube.

9. An air conditioning and dehumidification system according to any one of claims 1 to 7, wherein said evaporator comprises:

and the outlets of the capillary tubes of the evaporators are communicated with the evaporator outlet tube, and the evaporator outlet tube is communicated with the air suction end of the compressor.

10. A rail vehicle comprising an air conditioning and dehumidifying system, wherein the air conditioning and dehumidifying system is as claimed in any one of claims 1 to 9.