CN215971502U

CN215971502U - Air conditioning system and have its rail vehicle

Info

Publication number: CN215971502U
Application number: CN202121253020.1U
Authority: CN
Inventors: 石宇立; 朱沛文; 常银玲
Original assignee: Zhejiang Dunan Electro Mechanical Technology Co Ltd
Current assignee: Zhejiang Dunan Electro Mechanical Technology Co Ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2022-03-08
Anticipated expiration: 2031-06-04

Abstract

The utility model relates to the technical field of rail transit vehicles, in particular to an air conditioning system and a rail vehicle with the same. This air conditioning system is including setting up the casing on the carriage and setting up the fresh air conditioning unit in the casing, and the fresh air conditioning unit still includes secondary return air unit, and secondary return air unit communicates with each other with primary return air unit and fresh air unit respectively, and the secondary return air unit mixes the formation secondary mixed wind with primary mixed wind in with the carriage and inputs to the carriage. The utility model also provides a railway vehicle which comprises a carriage and the air conditioning system. Compared with the prior art, the utility model has the advantages that: through set up secondary return air unit in the casing to make the secondary return air unit mix the air in the carriage with primary mixed wind and form secondary mixed wind and input to the carriage in, thereby make and still guarantee passenger's comfort level at air conditioning system dehumidification in-process, and avoid carrying out the reheat and cause the wasting of resources.

Description

Air conditioning system and have its rail vehicle

Technical Field

The utility model relates to the technical field of rail transit vehicles, in particular to an air conditioning system and a rail vehicle with the same.

Background

With the rapid development of urban rail transit, the air conditioning system is used as an important auxiliary device for guaranteeing the comfort of vehicles, the product requirements are higher and higher, and the air conditioning system needs to be developed towards the direction of more energy conservation on the premise of guaranteeing the stability of the refrigeration or heating performance of the air conditioning system.

Air conditioning system among the current rail vehicle is at the cooling dehumidification in-process, will cool down to the required machine dew point of humidity control earlier, then through reheating, make the air reach required temperature, send into the air conditioner indoor again, so not only make the interior low reduction that leads to passenger's comfort level of temperature of dehumidification in-process carriage, make the in-process of reheating after cooling down earlier moreover, produce cold, the phenomenon that the heat offsets, cause the waste of serious energy.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an energy-saving air conditioning system.

In order to solve the technical problems, the utility model provides the following technical scheme:

an air conditioning system is used for conveying air with various temperatures into a carriage of a vehicle and comprises a shell arranged on the carriage and a fresh air conditioning unit arranged in the shell, wherein the fresh air conditioning unit comprises a fresh air unit and a primary return air unit which are communicated with each other, the fresh air unit conveys fresh air outside the carriage into the shell, and the primary return air unit conveys the air in the carriage into the shell and mixes the air with the fresh air to form primary mixed air; the fresh air conditioning unit further comprises a secondary air return unit, the secondary air return unit is communicated with the primary air return unit and the fresh air unit, and air in the compartment and primary mixed air are mixed in the secondary air return unit to form secondary mixed air which is input into the compartment.

It can be understood that this application is through set up in the casing secondary return air unit, so that in the secondary return air unit will air in the carriage with primary mixed wind mixes the formation secondary mixed wind input extremely in the carriage, thereby make air conditioning system dehumidification in-process still guarantees passenger's comfort level, and avoids using the electrical heating to carry out secondary heating and causes the wasting of resources.

In one embodiment, a secondary air return opening is formed in the shell, an air supply member is arranged in the secondary air return opening, the secondary air return opening and the air supply member form the secondary air return unit, and air in the carriage is conveyed into the shell through the air supply member.

In one embodiment, a secondary air return portion extends from the secondary air return opening towards the outer direction of the shell, the secondary air return portion is provided with a secondary air return cavity, the secondary air return portion is provided with an air inlet and an air outlet which are oppositely arranged and communicated with the secondary air return cavity, the air inlet is located on one surface, close to the outer side of the shell, of the secondary air return portion, the air outlet is located on one surface, close to the inner side of the shell, of the secondary air return portion, and air in a carriage enters the secondary air return cavity from the air inlet.

In one embodiment, a drying part is arranged on the wall of the secondary air return cavity, and air in the carriage enters the secondary air return cavity through the air inlet and can be adsorbed by the drying part.

It can be understood that the drying piece is arranged in the secondary air return cavity, so that air entering the air conditioning system from the compartment through the secondary air return cavity is subjected to dry-wet separation, water vapor in the air is removed, secondary condensation can be effectively prevented, and the overall dryness and comfort of the air are improved.

In one embodiment, the air supply part comprises a fan, the fan is arranged between the air inlet and the air outlet, and the fan can provide air supply power for air in the carriage to enter the secondary air return cavity.

It can be understood that the blower is arranged at the air inlet to pressurize and supply air in the carriage, so that the air in the carriage is conveniently conveyed into the secondary air return cavity.

In one embodiment, a filter element is arranged at one side of the air inlet close to the air outlet, and the air in the vehicle compartment is filtered by the filter element and then enters the secondary air return cavity.

It can be understood that the air inlet is provided with the filter element, so that impurities in the air are filtered, and the air is cleaner.

In one embodiment, the secondary air return unit comprises a secondary air return valve, the secondary air return valve is arranged on one side, away from the air outlet, of the air inlet, air in the carriage enters the shell through the secondary air return valve and is mixed with the primary mixed air to form secondary mixed air, and the secondary air return valve can control the air inlet amount of the secondary air return opening.

It can be understood that the secondary air return valve is arranged to adjust the air inlet volume of the secondary air return port, so that the air supply temperature is adjusted to a proper temperature value, the cooling and dehumidifying process can be efficiently and continuously operated, and the high comfort level of the carriage can be kept.

In one embodiment, a first heat exchange cavity, a compressor cavity and a second heat exchange cavity are sequentially arranged in the shell at intervals, the first heat exchange cavity is communicated with the compressor cavity through an air guide opening, a fresh air inlet is formed in the side face of the shell, a fresh air valve is arranged in the fresh air inlet, the fresh air inlet and the fresh air valve form a fresh air unit, the fresh air inlet is communicated with the compressor cavity, a primary air return opening is formed in the shell, a primary air return valve is arranged in the primary air return opening, the primary air return opening and the primary air return valve form the primary air return unit, and the primary air return opening is communicated with the first heat exchange cavity; the fresh air conditioning unit comprises a first fan, a second fan, a first heat exchanger, a compressor and a second heat exchanger which are sequentially connected through a refrigerant circulating pipeline, the first heat exchanger is arranged in a first heat exchange cavity, the compressor is arranged in a compressor cavity, the second heat exchanger is arranged in a second heat exchange cavity, a secondary air return opening is arranged between the primary air return opening and the first fan, and the primary air return opening and the secondary air return opening both supply air to the first heat exchanger so as to mix primary mixed air to form secondary mixed air; the second fan is arranged in the second heat exchange cavity and is arranged at intervals with the second heat exchanger.

In one embodiment, a plurality of first blades fixedly arranged are arranged on one side of the air outlet, which is far away from the air inlet, the first blades are obliquely arranged relative to the secondary air return opening, and the first blades are obliquely arranged relative to the first heat exchanger, so that the air outlet range of the secondary air return opening falls into the heat exchange range of the first heat exchanger.

It is understood that, by making an extension line of the first blade extending toward the first heat exchanger lower than the highest point of the first heat exchanger, the wind sent from the secondary air return opening to the first heat exchanger is prevented from being ununiformly mixed with the primary mixed wind.

In one embodiment, the secondary air return unit is arranged between the first fan and the first heat exchanger, the primary air return unit is arranged on one side of the first heat exchanger, which is far away from the secondary air return unit, air in the carriage enters the shell from the primary air return opening and is mixed with fresh air to form primary mixed air, the primary mixed air is conveyed to the secondary air return opening through the first heat exchanger, the air in the carriage enters from the secondary air return opening and is supplied towards the direction of the first heat exchanger, the primary mixed air is mixed with the primary mixed air to form secondary mixed air, and the secondary mixed air is conveyed into the carriage through the first fan.

The utility model also provides the following technical scheme:

a rail vehicle comprises a compartment and an air conditioning system, wherein the air conditioning system is arranged on the compartment.

Compared with the prior art, the air conditioning system provided by the utility model has the advantages that the secondary air return unit is arranged in the shell, so that the secondary air return unit mixes the air in the carriage with the primary mixed air to form the secondary mixed air, and the secondary mixed air is input into the carriage, the comfort level of passengers is still ensured in the dehumidification process of the air conditioning system, and the resource waste caused by secondary heating by using electric heating is avoided.

Drawings

FIG. 1 is a schematic top view of an air conditioning system according to the present invention;

FIG. 2 is a schematic diagram of a front view of an air conditioning system according to the present invention;

FIG. 3 is a schematic left-view structural diagram of an air conditioning system according to the present invention;

FIG. 4 is a schematic view of a portion of the enlarged structure at A in FIG. 3;

fig. 5 is a schematic bottom view of an air conditioning system according to the present invention.

The symbols in the drawings represent the following meanings:

100. an air conditioning system; 10. a housing; 11. a first housing; 111. a first heat exchange chamber; 12. A second housing; 121. a compressor cavity; 13. a third housing; 131. a second heat exchange chamber; 14. An air purifier; 20. a fresh air conditioning unit; 21. a fresh air unit; 211. a fresh air inlet; 212. a rain separator; 213. a fresh air valve; 22. a primary air return unit; 221. a primary air return inlet; 222. a primary air return valve; 23. a secondary air return unit; 231. a secondary air return portion; 2311. A secondary air return cavity; 2312. an air inlet; 2313. an air outlet; 232. a secondary air return inlet; 233. a first blade; 234. a secondary air return valve; 2341. a second blade; 24. a first fan; 241. an air supply duct; 25. a second fan; 26. a first heat exchanger; 261. a filter screen; 27. A compressor; 28. a second heat exchanger; 281. and a heat dissipation port.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 5, an air conditioning system 100 is provided, where the air conditioning system 100 is applied to a transportation vehicle such as a rail vehicle, and the air conditioning system 100 is mainly used for delivering air with various temperatures into a passenger compartment of the transportation vehicle such as a rail vehicle to improve comfort of passengers in the passenger compartment.

In order to solve the problems of the existing air conditioning system in the rail vehicle, the utility model provides an air conditioning system 100 for delivering air with various temperatures into a compartment of the vehicle, which comprises a shell 10 arranged on the compartment and a fresh air conditioning unit 20 arranged in the shell 10. The fresh air conditioning unit 20 comprises a fresh air unit 21 and a primary return air unit 22 which are communicated with each other, the fresh air unit 21 conveys fresh air outside a compartment into the shell 10, and the primary return air unit 22 conveys air in the compartment into the shell 10 and mixes the air with the fresh air to form primary mixed air; the fresh air conditioning unit 20 further comprises a secondary return air unit 23, the secondary return air unit 23 is communicated with the primary return air unit 22 and the fresh air unit 21 respectively, and air in the compartment and primary mixed air are mixed in the secondary return air unit 23 to form secondary mixed air which is input into the compartment.

This application is through setting up secondary return air unit 23 in casing 10 to make in the secondary return air unit 23 mix the air in the carriage with primary mixed wind and form secondary mixed wind and input to the carriage, thereby make and still guarantee passenger's comfort level at air conditioning system 100 dehumidification in-process, and avoid carrying out the reheat and cause the wasting of resources.

As shown in fig. 1, the housing 10 includes a first housing 11, a second housing 12, and a third housing 13, which are sequentially disposed and connected to each other. Wherein, the first shell 11 has a first heat exchange cavity 111 therein, the second shell 12 has a compressor cavity 121 therein, and the third shell 13 has a second heat exchange cavity 131 therein. The first heat exchange cavity 111, the compressor cavity 121 and the second heat exchange cavity 131 are sequentially arranged at intervals, an air guide opening is formed in the connecting position of the first shell 11 and the second shell 12, and the first heat exchange cavity 111 and the compressor cavity 121 can be communicated with each other through the air guide opening.

Further, a fresh air inlet 211 is formed on a side surface of the second housing 12. The fresh air inlet 211 is internally provided with a fresh air valve, and the fresh air inlet 211 and the fresh air valve form a fresh air unit 21. The outside of the fresh air inlet 211 is provided with a rain water separator 212 to filter out water vapor in the fresh air. The fresh air inlet 211 is communicated with the compressor cavity 121, fresh air outside the compartment can enter the compressor cavity 121 through the fresh air inlet 211 and then enter the first heat exchange cavity 111 through the air guide opening. The fresh air valve is used for controlling the air intake of the fresh air inlet 211.

The first casing 11 is provided with a primary air return opening 221. A primary air return valve is arranged in the primary air return opening 221, the primary air return opening 221 and the primary air return valve form a primary air return unit 22, and the primary air return opening 221 is communicated with the first heat exchange cavity 111. After being conveyed to the compressor cavity 121 through the fresh air inlet 211, the fresh air is conveyed to the first heat exchange cavity 111 through an air guide opening (not shown), the air in the compartment enters the first heat exchange cavity 111 through the primary air return opening 221, and the fresh air and the air in the compartment are mixed in the first heat exchange cavity 111 to form primary mixed air. So set up, primary return air valve is used for controlling the intake of primary return air inlet 221.

Specifically, the primary return air unit 22 also includes a primary return valve 222. The primary air return valve 222 is disposed at the primary air return opening 221, and the primary air return valve 222 is used for controlling an air intake amount of the primary air return opening 221.

Further, the fresh air conditioning unit 20 further includes a first fan 24, a second fan 25, and a first heat exchanger 26, a compressor 27, and a second heat exchanger 28 sequentially connected through a refrigerant circulation pipeline. The first fan 24 and the first heat exchanger 26 are disposed in the first casing 11, the compressor 27 is disposed in the second casing 12, and the second fan 25 and the second heat exchanger 28 are disposed in the third casing 13.

It should be noted that the first fan 24 is used for supplying air supply power to convey secondary mixed air formed by mixing in the first heat exchange cavity 111 into the vehicle cabin, and the first fan 24 is connected to an air supply duct 241 near the outer side of the first casing 11, and the air supply duct 241 is used for conveying the secondary mixed air from the inside of the casing 10 to the outside of the casing 10 and then conveying the secondary mixed air into the vehicle cabin. The side wall of the third casing 13 is provided with a heat dissipation opening 281 corresponding to the second fan 25, and the heat dissipation opening 281 is communicated with the second fan 25, so that the circulating air volume of the fresh air conditioning unit 20 is ensured, and the improvement performance of the air in the compartment and the refrigeration or heating effect of the compartment are improved.

In the present embodiment, the first fan 24 is an evaporation fan. Preferably, the evaporation fan is a centrifugal fan. In other embodiments, the first fan 24 may also be another type of fan as long as it can provide air supply power; the second fan 25 is a condensing fan. Preferably, the condensing fan is an axial flow fan, and in other embodiments, the second fan 25 may also be another type of fan as long as it can provide air supply power. Of course, the first fan 24 may be a condensing fan, and the second fan 25 may be an evaporating fan, which is not limited herein.

It should be noted that the number of the first fan 24, the second fan 25, the first heat exchanger 26, the second heat exchanger 28, the compressor 27, the primary air return unit 22, the secondary air return unit 23, and the fresh air unit 21 is 2, and they are all symmetrically arranged. Of course, in other embodiments, 3, 4, 5 or more may be provided, and the setting position may be adjusted according to actual requirements, which is not limited herein.

The first heat exchanger 26 is located between the primary air return unit 22 and the secondary air return unit 23, and is provided corresponding to the primary air return unit 22 and the secondary air return unit 23, respectively. It should be noted that the corresponding arrangement means that the air in the first heat exchanger 26, the primary air return unit 22 and the secondary air return unit 23 can be mutually transferred. The primary mixed air is blown to the secondary air return unit 23 after being subjected to heat exchange through the first heat exchanger 26, and the air in the carriage is conveyed to the first shell 11 in the direction towards the first heat exchanger 26 through the secondary air return unit 23, so that the primary mixed air is mixed with the air in the carriage to form secondary mixed air, and the secondary mixed air is conveyed to the air supply duct 241 by the first fan 24 and then conveyed to the carriage.

The second heat exchanger 28 is located at both sides of the second fan 25 and is disposed corresponding to the heat radiating port 281. It should be noted that the corresponding arrangement means that the air in the second heat exchanger 28, the second fan 25 and the heat dissipation opening 281 can be mutually transmitted. In this embodiment, the first heat exchanger 26 is an evaporator and the second heat exchanger 28 is a condenser. This enables the first heat exchanger 26 to achieve refrigeration of the primary mixed air. However, the first heat exchanger 26 and the second heat exchanger 28 can be switched by adjusting an expansion valve and a switching valve on the refrigerant circulation line, so that the first heat exchanger 26 is a condenser and the second heat exchanger 28 is an evaporator. In this case, the first heat exchanger 26 can heat the primary mixed air.

As shown in fig. 1 and 2, the first casing 11 is provided with a secondary air return opening 232. The secondary air return opening 232 is arranged between the primary air return opening 221 and the first fan 24, and the primary air return opening 221 and the secondary air return opening 232 both supply air towards the first heat exchanger 26 so as to mix the primary mixed air with air in the carriage to form secondary mixed air; an air supply part is arranged in the secondary air return opening 232, and the secondary air return opening 232 and the air supply part form a secondary air return unit 23. The air in the vehicle compartment is sent into the first casing 11 through the blower. That is, the blowing member supplies blowing power for conveying air in the vehicle compartment into the first casing 11 through the secondary air return opening 232. The first fan 24 is used for supplying air in the cabin under pressure, so that the air in the cabin is conveniently conveyed to the secondary air return opening 232.

Specifically, a filter screen 261 is further disposed between the first air return opening and the first heat exchanger 26, so that primary mixed air in the first heat exchange cavity 111 is filtered, air quality is guaranteed, and dust particles in the primary mixed air are prevented from being attached to the first heat exchanger 26 and affecting heat exchange performance of the first heat exchanger. An air purifier 14 is further disposed in the first heat exchange cavity 111, and the air purifier 14 is used for purifying air and then cooperates with the filter screen 261 to ensure that the air entering the cabin is clean and comfortable.

Further, a secondary air return portion 231 extends from the secondary air return opening 232 toward the outside of the casing 10. The secondary air return 231 has a secondary air return chamber 2311. The secondary return air portion 231 has an air inlet 2312 and an air outlet 2313 which are oppositely arranged and communicated with the secondary return air cavity 2311. The air inlet 2312 is located on one side of the secondary air return portion 231 close to the outside of the housing 10, the air outlet 2313 is located on one side of the secondary air return portion 231 close to the inside of the housing 10, and air in the carriage enters the secondary air return cavity 2311 from the air inlet 2312 and is then conveyed into the first housing 11 through the air outlet 2313.

Specifically, a drying part is arranged on the wall of the secondary air return cavity 2311. The drying element is disposed on a quarter of the inner surface of the cavity wall of the secondary air return cavity 2311, and the drying element is selected from activated carbon but not limited to activated carbon. Air in the compartment enters the secondary return air chamber 2311 through the air inlet 2312 and can be adsorbed by the drying element. By arranging the drying part in the secondary air return cavity 2311, air entering the air conditioning system 100 from the compartment through the secondary air return cavity 2311 is subjected to dry-wet separation, water vapor in the air is removed, and the overall dryness and comfort of the air are improved.

Further, the air supply member includes a fan. The blower is disposed between the air inlet 2312 and the air outlet 2313. The fan can provide air supply power for the air in the carriage to enter the secondary air return cavity 2311. The blower is used for pressurizing and supplying air in the carriage, so that the air in the carriage is conveniently conveyed to the secondary air return cavity 2311. In the embodiment, the cross-flow fan is selected as the fan; in other embodiments, the blower may be of other types, as long as the function of providing the air supply force is achieved, and the blower is not limited herein.

The air inlet 2312 is provided with a filter element on one side close to the air outlet 2313, and air in the carriage enters the secondary air return cavity 2311 after being filtered by the filter element. The filtering piece is used for filtering impurities in the air, so that the air is cleaner.

Further, the secondary return air unit 23 further includes a secondary return air valve 234. The secondary air return valve 234 is disposed at a side of the secondary air return portion 231 adjacent to the air inlet 2312. Air in the carriage enters the secondary air return cavity 2311 through the secondary air return valve 234, is conveyed into the first shell 11 and then is mixed with the primary mixed air to form secondary mixed air.

Specifically, the secondary return air valve 234 includes a plurality of second vanes 2341 arranged uniformly. The second vanes 2341 can be turned toward the direction close to/away from the secondary air return opening 232, and when the second vanes 2341 are turned to the position perpendicular to the axis of the secondary air return opening 232, the secondary air return opening 232 can be closed, so that the air in the vehicle compartment cannot enter the secondary air return cavity 2311. Along with second blade 2341's upset, can adjust the intake of secondary return air inlet 232 to adjust suitable temperature value with supply air temperature, not only can make the high-efficient continuous operation of cooling dehumidification process, but also can make and keep higher comfort level in the carriage.

As shown in fig. 3 and 4, a plurality of first blades 233 are fixedly disposed at one side of the air outlet 2313 of the secondary air return portion 231, and the first blades 233 are disposed in an inclined manner with respect to the secondary air return opening 232. It should be noted that the first blade 233 cannot be turned with respect to the secondary air return 231. The air delivered from the secondary air return cavity 2311 through the air outlet 2313 towards the first heat exchanger 26 can be delivered at a fixed angle by fixedly arranging the first blades 233 at the air outlet 2313 according to a designed fixed angle, so that the primary mixed air and the air in the carriage can be maximally mixed.

Preferably, the outlet air range of the secondary air return opening 232 falls within the heat exchange range of the first heat exchanger 26. It should be noted that the outlet air range of the secondary air return opening 232 refers to a range between the highest point position and the lowest point position of the air output from the secondary air return opening 232, and the outlet air range of the secondary air return opening 232 falling within the heat exchange range of the first heat exchanger 26 refers to that the highest point position of the air output from the secondary air return opening 232 cannot be higher than the highest point of the first heat exchanger 26, and the lowest point position of the air output from the secondary air return opening 232 cannot be lower than the lowest point of the first heat exchanger 26. If the highest point of the air output from the first blade 233 toward the first heat exchanger 26 is higher than the highest point of the first heat exchanger 26, or the lowest point of the air output from the first blade 233 toward the first heat exchanger 26 is lower than the lowest point of the first heat exchanger 26, the air delivered from the secondary air return chamber 2311 toward the first heat exchanger 26 through the air outlet 2313 may not be blown into the first heat exchanger 26, so that the air delivered from the secondary air return opening 232 to the first heat exchanger 26 may be mixed unevenly with the primary mixed air.

As shown in fig. 5, in the working process of the air conditioning system 100 provided by the present invention, fresh air outside the vehicle compartment is filtered and dried by the rain water separator 212, enters the fresh air inlet 211 through the fresh air valve, enters the compressor cavity 121 from the fresh air inlet 211, and enters the first heat exchange cavity 111 through the air guide opening; air in the compartment enters the primary air return opening 221 through the primary air return valve 222 and then enters the first heat exchange cavity 111 from the primary air return opening 221, and at the moment, the air in the compartment and fresh air are mixed in the first heat exchange cavity 111 to form primary mixed air; the primary mixed air is filtered by the filter screen 261 and then enters the first heat exchanger 26 for cooling and dehumidification; the temperature is reduced in the dehumidification process, air in the carriage is conveyed to the first heat exchange cavity 111 again through the secondary air return unit 23, the air in the carriage enters the secondary air return cavity 2311 through the secondary air return valve 234, the air is supplied at a fixed angle towards the first heat exchanger 26 through the air outlet 2313, the air in the carriage guided again is mixed with primary mixed air in the first heat exchange cavity 111 to form secondary mixed air with moderate temperature, and the secondary mixed air is conveyed to the air supply duct 241 through the first fan 24 and conveyed into the carriage.

According to the air conditioning system 100 provided by the utility model, the secondary air return unit 23 is arranged in the shell 10, so that the secondary air return unit 23 mixes the air in the carriage with the primary mixed air to form secondary mixed air, and the secondary mixed air is input into the carriage, therefore, the comfort level of passengers is still ensured in the dehumidification process of the air conditioning system 100, and the resource waste caused by secondary heating is avoided.

The present invention further provides a rail vehicle (not shown) including a car (not shown) and an air conditioning system 100, wherein the air conditioning system 100 is disposed on the car.

The rail vehicle also has the same advantages as the air conditioning system 100 described above.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An air conditioning system is used for conveying air with various temperatures into a compartment of a vehicle and comprises a shell (10) arranged on the compartment and a fresh air conditioning unit (20) arranged in the shell (10), wherein the fresh air conditioning unit (20) comprises a fresh air unit (21) and a primary return air unit (22) which are mutually communicated, the fresh air unit (21) conveys the fresh air outside the compartment into the shell (10), and the primary return air unit (22) conveys the air in the compartment into the shell (10) and mixes the air with the fresh air to form primary mixed air;

the fresh air conditioning unit (20) is characterized by further comprising a secondary air return unit (23), wherein the secondary air return unit (23) is communicated with the primary air return unit (22) and the fresh air unit (21) respectively, and air in the compartment and primary mixed air are mixed in the secondary air return unit (23) to form secondary mixed air which is input into the compartment.

2. The air conditioning system according to claim 1, wherein a secondary air return opening (232) is formed in the casing (10), an air supply member is provided in the secondary air return opening (232), the secondary air return opening (232) and the air supply member form the secondary air return unit (23), and the air in the vehicle compartment conveys the air in the vehicle compartment into the casing (10) through the air supply member.

3. The air conditioning system of claim 2, wherein a secondary air return portion (231) extends from the secondary air return opening (232) toward an outside direction of the housing (10), the secondary air return portion (231) has a secondary air return cavity (2311), the secondary air return portion (231) has an air inlet (2312) and an air outlet (2313) which are oppositely arranged and communicated with the secondary air return cavity (2311), the air inlet (2312) is located at a side of the secondary air return portion (231) close to the outside of the housing (10), the air outlet (2313) is located at a side of the secondary air return portion (231) close to the inside of the housing (10), and air in the vehicle compartment enters the secondary air return cavity (2311) from the air inlet (2312).

4. The air conditioning system of claim 3, wherein a drying member is disposed on a wall of the secondary air return chamber (2311), and air in the vehicle compartment enters the secondary air return chamber (2311) through the air inlet (2312) and can be adsorbed by the drying member.

5. The air conditioning system of claim 4, wherein the air supply member comprises a fan disposed between the air inlet (2312) and the air outlet (2313), and the fan is capable of providing air supply power for air in the vehicle compartment to enter the secondary air return chamber (2311).

6. Air conditioning system according to claim 4, characterized in that the side of the air inlet (2312) close to the air outlet (2313) is provided with a filter, and the air in the vehicle compartment is filtered by the filter and enters the secondary air return chamber (2311).

7. The air conditioning system as claimed in claim 3, wherein the secondary air return unit (23) includes a secondary air return valve (234), the secondary air return valve (234) is disposed at a side of the air inlet (2312) away from the air outlet (2313), air in the vehicle compartment enters the housing (10) through the secondary air return valve (234) and is mixed with the primary mixed air to form the secondary mixed air, and the secondary air return valve (234) is capable of controlling an air inlet amount of the secondary air return opening (232).

8. The air conditioning system according to claim 3, wherein the casing (10) has a first heat exchange chamber (111), a compressor chamber (121) and a second heat exchange chamber (131) arranged at intervals in sequence, the first heat exchange chamber (111) is communicated with the compressor chamber (121) through an air guide opening, a fresh air inlet (211) is formed in the side surface of the casing (10), a fresh air valve (213) is arranged in the fresh air inlet (211), the fresh air inlet (211) and the fresh air valve (213) form the fresh air unit (21), the fresh air inlet (211) is communicated with the compressor chamber (121), a primary air return opening (221) is formed in the casing (10), a primary air return valve (222) is arranged in the primary air return opening (221), and the primary air return opening (221) and the primary air return valve (222) form the primary air return unit (22), the primary air return opening (221) is communicated with the first heat exchange cavity (111);

the fresh air conditioning unit (20) comprises a first fan (24), a second fan (25), a first heat exchanger (26), a compressor (27) and a second heat exchanger (28) which are sequentially connected through a refrigerant circulating pipeline, wherein the first heat exchanger (26) is arranged in a first heat exchange cavity (111), the compressor (27) is arranged in a compressor cavity (121), the second heat exchanger (28) is arranged in a second heat exchange cavity (131), a secondary air return opening (232) is arranged between a primary air return opening (221) and the first fan (24), and the primary air return opening (221) and the secondary air return opening (232) both supply air towards the first heat exchanger (26) so as to mix primary mixed air to form secondary mixed air; the second fan (25) is arranged in the second heat exchange cavity (131) and is arranged at intervals with the second heat exchanger (28).

9. The air conditioning system according to claim 8, wherein a plurality of first blades (233) are fixedly arranged on one side of the air outlet (2313) far away from the air inlet (2312), and the first blades (233) are obliquely arranged relative to the first heat exchanger (26) so that the air outlet range of the secondary air return inlet (232) falls within the heat exchange range of the first heat exchanger (26).

10. Air conditioning system according to claim 8, characterized in that the secondary return air unit (23) is arranged between the first fan (24) and the first heat exchanger (26), the primary air return unit (22) is arranged on one side of the first heat exchanger (26) far away from the secondary air return unit (23), the air in the carriage enters the shell (10) from the primary air return opening (221) and is mixed with fresh air to form primary mixed air, the primary mixed air is conveyed to the secondary air return opening (232) through the first heat exchanger (26), the air in the compartment enters from the secondary air return opening (232) and is blown towards the direction of the first heat exchanger (26), and is mixed with the primary mixed air to form the secondary mixed air, and the secondary mixed air is conveyed into the compartment through the first fan (24).

11. A rail vehicle, characterized in that it comprises a passenger compartment and an air conditioning system as claimed in claims 1 to 10, which is arranged on the passenger compartment.