Air conditioning system and carrier

Abstract

The utility model relates to the technical field of air conditioners, in particular to an air conditioning system and a carrier. The air conditioning system comprises a refrigerant loop, a first heat exchange loop, a second heat exchange loop and a heat exchange device. The refrigerant loop comprises a compressor, a condenser, a throttling device and an evaporator which are connected in sequence, and the first heat exchange loop is in heat exchange connection with the refrigerant loop through the condenser; the second heat exchange loop is in heat exchange connection with the refrigerant loop through an evaporator, and the first heat exchange loop is in heat exchange connection with the second heat exchange loop through a heat exchange device. According to the air conditioning system, secondary heat exchange between the refrigerant loop and the first heat exchange loop and the second heat exchange loop is achieved through the condenser and the evaporator, heat exchange connection between the first heat exchange loop and the second heat exchange loop is achieved through the heat exchange device, heat loss is compensated, and the heat transfer efficiency is optimized; therefore, the performance coefficient of the whole system is improved, and the energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and specifically provides an air conditioning system and a vehicle. BACKGROUND

[0002] At present, the refrigerant in some vehicle air conditioning systems is not suitable for being directly introduced into the vehicle due to flammability and other factors, and therefore another intermediate medium is usually used for secondary heat exchange. For example, water is used as an intermediate medium to exchange heat with the refrigerant first, and then the water is introduced into the vehicle to exchange heat with the environment in the vehicle.

[0003] However, the secondary heat exchange mode increases energy consumption and reduces the coefficient of performance of the air conditioner. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to solve at least part of the technical problems mentioned above, and the aim is achieved by the following technical solutions:

[0005] In a first aspect, the present application provides an air conditioning system, which comprises a refrigerant circuit, a first heat exchange circuit, a second heat exchange circuit and a heat exchange device; the refrigerant circuit comprises a compressor, a condenser, a throttling device and an evaporator connected in sequence, the first heat exchange circuit is connected in heat exchange with the condenser of the refrigerant circuit, the second heat exchange circuit is connected in heat exchange with the evaporator of the refrigerant circuit, and the first heat exchange circuit and the second heat exchange circuit are connected in heat exchange with the heat exchange device.

[0006] In some embodiments, the heat exchange device comprises an inner tube and an outer tube coaxially sleeved, one of the inner tube and the outer tube is connected with the first heat exchange circuit, and the other of the inner tube and the outer tube is connected with the second heat exchange circuit.

[0007] In some embodiments, the inner tube is connected with the second heat exchange circuit, and the outer tube is connected with the first heat exchange circuit.

[0008] In some embodiments, the inner tube has a plurality of protrusions in the circumferential direction in terms of cross-sectional shape.

[0009] In some embodiments, the inner tube is spirally arranged along the length direction thereof.

[0010] In some embodiments, the outer tube is wrapped with a heat insulation layer.

[0011] In some embodiments, the heat exchange device comprises a first branch and a second branch, two ends of the first branch are respectively connected with the first heat exchange circuit and the second heat exchange circuit, and the first branch is used for conveying the heat exchange medium in the first heat exchange circuit to the second heat exchange circuit; two ends of the second branch are respectively connected with the first heat exchange circuit and the second heat exchange circuit, and the second branch is used for conveying the heat exchange medium in the second heat exchange circuit to the first heat exchange circuit.

[0012] In some embodiments, the hydraulic pressure of the first branch at the connection position with the first heat exchange circuit is greater than the hydraulic pressure of the first branch at the connection position with the second heat exchange circuit; the hydraulic pressure of the second branch at the connection position with the second heat exchange circuit is greater than the hydraulic pressure of the second branch at the connection position with the first heat exchange circuit; and / or, the first branch is provided with a first check valve, an inlet end of the first check valve being in communication with the first heat exchange circuit, and an outlet end of the first check valve being in communication with the second heat exchange circuit; the second branch is provided with a second check valve, an inlet end of the second check valve being in communication with the second heat exchange circuit, and an outlet end of the second check valve being in communication with the first heat exchange circuit.

[0013] In some embodiments, the first branch forms a first intersection point and a second intersection point on the first heat exchange circuit and the second heat exchange circuit respectively, the second branch forms a third intersection point and a fourth intersection point on the first heat exchange circuit and the second heat exchange circuit respectively, the first intersection point is provided with a first three-way valve, the second intersection point is provided with a second three-way valve, the third intersection point is provided with a third three-way valve, and the fourth intersection point is provided with a fourth three-way valve; wherein at least the second three-way valve is a proportional three-way valve, a flow rate at a communication position of the second three-way valve with the first branch is Q1, a flow rate at a communication position of the second three-way valve with the second heat exchange circuit is Q, and 12%≤Q1 / Q≤25% is satisfied.

[0014] In a second aspect, the present application provides a carrier comprising the air conditioning system of the first aspect.

[0015] The technical solutions provided by the present application have at least the following technical effects:

[0016] In the present application, the air conditioning system realizes secondary heat exchange of the refrigerant circuit with the first heat exchange circuit and the second heat exchange circuit through the condenser and the evaporator, and further realizes heat exchange connection between the first heat exchange circuit and the second heat exchange circuit through the heat exchange device, thereby compensating for heat loss, optimizing heat transfer efficiency, reducing energy consumption, and improving the coefficient of performance of the overall system. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to better combine the content shown in the drawings of the specification with the content described in the specific embodiments, the drawings of the specification are briefly introduced as follows. It can be understood that the drawings of the specification mentioned below only schematically show the related technical solutions and some embodiments of the technical solutions of the present application, and under the premise of not paying creative labor, a person skilled in the art can also make drawings showing other embodiments.

[0018] Specifically, the annotations of the drawings of the specification are as follows:

[0019] Figure 1 A structural schematic diagram of the first air conditioning system described in some embodiments of the present application;

[0020] Figure 2Structure diagram of a second air conditioning system according to some embodiments of the present application;

[0021] Figure 3 Front view of a first heat exchange structure according to some embodiments of the present application;

[0022] Figure 4 Sectional view of the first heat exchange structure according to some embodiments of the present application;

[0023] Figure 5 Partial structure diagram of a second heat exchange structure according to some embodiments of the present application;

[0024] Figure 6 Partial structure diagram of a third heat exchange structure according to some embodiments of the present application.

[0025] Specifically, the annotations of the figures in the description are as follows:

[0026] 10, refrigerant circuit; 101, condenser; 102, evaporator; 103, compressor; 104, throttling device; 20, first heat exchange circuit; 30, second heat exchange circuit; 301, pump body; 302, heat exchanger; 40, heat exchange device; 401, inner tube; 402, outer tube; 403, first branch; 404, second branch; 405, first three-way valve; 406, second three-way valve; 407, third three-way valve; 408, fourth three-way valve; 409, first check valve; 410, second check valve; 50, passenger cabin. DETAILED DESCRIPTION

[0027] To make the content of the embodiments of the present application more clear, the following will be described in conjunction with the figures in the description. It can be understood that the following mentioned content is only some embodiments of the present application, and all the embodiments are enumerated in detail. Therefore, other embodiments obtained based on the following embodiments fall within the protection scope of the present application without creative labor.

[0028] It should be understood that the terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the technical solutions, unless the context clearly indicates otherwise. For example, the terms "one", "a", and "said" used herein are intended to modify a particular feature, which does not exclude the possibility that the feature can be a plurality in other embodiments.

[0029] It should be understood that the terms "comprise", "include" and "have" are open, which indicates the existence of the stated features, but does not exclude the possibility that other features also exist in the embodiments. Similarly, the terms "first", "second", etc. used herein to describe multiple features only indicate that one feature is distinguished from another feature, unless the context clearly indicates otherwise, such terms do not imply order or sequence.

[0030] It should be understood that the terms "set", "connected", "mounted" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through a medium. For those skilled in the art, the specific meaning of the above terms in the text can be understood according to the specific circumstances.

[0031] In addition, in order to facilitate the description, the spatial relative terms will be used to explain the position of one feature relative to another feature, for example, "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific circumstances other than those shown in the drawings.

[0032] The background of the present application is further described below.

[0033] With the improvement of environmental awareness, the current domestic vehicle commonly used refrigerant R134a (tetrafluoroethane, non-combustible, but can cause global warming) is facing use restrictions, and alternative working substances such as R290, R744, etc. gradually begin to be applied. Because of the consideration of factors such as flammable R290, R744 refrigerant, which is not suitable for introduction into the vehicle, most vehicle air conditioners use "secondary heat exchange" to meet the cooling demand of the vehicle, that is, using an intermediate medium to exchange heat with the refrigerant twice. For example, water is used as an intermediate medium to exchange heat with the refrigerant first, and then the water is introduced into the vehicle to exchange heat with the environment in the vehicle.

[0034] However, the secondary heat exchange method will increase energy consumption and reduce the coefficient of performance of the air conditioner. Specifically, since there is a problem of heat loss in each heat exchange, in order to make the vehicle achieve the effect of one-time heat exchange (i.e. the refrigerant directly exchanges heat with the vehicle) through secondary heat exchange, the refrigerant should be made to reach a lower temperature before exchanging heat with the intermediate medium. Correspondingly, the compressor 103 in the refrigerant circuit 10 needs to provide higher pressure, that is, the compression ratio (the ratio of the discharge pressure to the suction pressure) of the compressor 103 increases, the energy consumption of the compressor 103 increases, and the COP (Coefficient of Performance, performance coefficient, the ratio of refrigerating capacity to consumed electric power) of the air conditioning system decreases.

[0035] The embodiments of the present application are described below in conjunction with the drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.

[0036] In a first aspect, with reference to Figure 1 andFigure 2 Embodiments of the present application provide an air conditioning system, which comprises a refrigerant circuit 10, a first heat exchange circuit 20, a second heat exchange circuit 30 and a heat exchange device 40; the refrigerant circuit 10 comprises a compressor 103, a condenser 101, a throttling device 104 and an evaporator 102 connected in sequence, the first heat exchange circuit 20 is in heat exchange connection with the refrigerant circuit 10 through the condenser 101; the second heat exchange circuit 30 is in heat exchange connection with the refrigerant circuit 10 through the evaporator 102, and the first heat exchange circuit 20 is in heat exchange connection with the second heat exchange circuit 30 through the heat exchange device 40.

[0037] In the embodiments, the air conditioning system realizes the secondary heat exchange between the refrigerant circuit 10 and the first heat exchange circuit 20 and the second heat exchange circuit 30 through the condenser 101 and the evaporator 102, and further realizes the heat exchange connection between the first heat exchange circuit 20 and the second heat exchange circuit 30 through the heat exchange device 40, so as to compensate the heat loss, optimize the heat transfer efficiency, reduce the energy consumption and improve the coefficient of performance of the overall system.

[0038] Specifically, the refrigerant circuit 10 is provided with a refrigerant, the first heat exchange circuit 20 is provided with a first medium, and the second heat exchange circuit 30 is provided with a second medium. The refrigerant circuit 10 comprises the compressor 103, the condenser 101, the throttling device 104 and the evaporator 102, which are connected in sequence by pipes and form a closed system, the refrigerant circulates in the closed system, changes state and exchanges heat with other systems. More specifically, the liquid refrigerant absorbs the heat of the second medium in the evaporator 102 (the second medium is cooled to cool the passenger compartment 50), and vaporizes into low-pressure steam (the low pressure makes the boiling point of the refrigerant lower, so that the refrigerant is easy to vaporize); the vaporized refrigerant is sucked into the compressor 103, compressed into high-pressure steam and then discharged into the condenser 101 (the high pressure makes the boiling point of the refrigerant higher, so that the refrigerant is not easy to vaporize, and thus is easy to change into liquid phase in the condenser 101); the heat is released to the first medium in the condenser 101, and the condensed high-pressure liquid refrigerant changes into low-pressure liquid refrigerant through the throttling device 104 (the throttling device 104 can be an expansion valve), and then enters the evaporator 102 to absorb heat and vaporize, so as to achieve the purpose of circulating refrigeration. In this way, the refrigerant completes a refrigeration cycle through the four basic processes of compression, condensation, throttling and evaporation in the refrigerant circuit 10.

[0039] It should be noted that after the second medium exchanges heat with the passenger cabin 50, the temperature of the second medium will be higher than the temperature of the first medium, and the second medium exchanges heat with the first medium through the heat exchange device 40, so that the temperature of the first medium is reduced, and the temperature of the refrigerant is further reduced after the first medium exchanges heat with the refrigerant, thereby compensating for the heat loss in the secondary heat exchange, optimizing the heat transfer efficiency, reducing the energy consumption of the compressor 103, and improving the performance coefficient of the overall system. In addition, the heat exchange area of the evaporator 102 can be increased, thereby compensating for the temperature rise of the second medium due to heat exchange with the first medium, i.e., increasing the heat exchange area between the second medium and the refrigerant to ensure the low temperature of the second medium and meet the cooling demand in the passenger cabin 50.

[0040] Optionally, the first heat exchange circuit 20 dissipates heat through the external environment; referring to Figure 1 and Figure 2 , the second heat exchange circuit 30 is provided with a heat exchanger 302, and the second heat exchange circuit 30 exchanges heat with the environment in the passenger cabin 50 through the heat exchanger 302.

[0041] In some embodiments, referring to Figure 1 and Figures 3 to 6 , the heat exchange device 40 includes an inner tube 401 and an outer tube 402 coaxially sleeved, one of the inner tube 401 and the outer tube 402 is connected with the first heat exchange circuit 20, and the other is connected with the second heat exchange circuit 30.

[0042] The embodiment provides a specific implementation of the heat exchange device 40, i.e., the structure design of the coaxially sleeved inner tube 401 and outer tube 402. The embodiment enables the first medium and the second medium to effectively exchange heat in a compact space, avoids complex pipe network design, and reduces costs. In addition, the structure also ensures the consistency of the flow direction, which helps to improve the heat exchange efficiency.

[0043] Optionally, the first heat exchange circuit 20 communicates with the inner tube 401, and the second heat exchange circuit 30 communicates with the outer tube 402; or the first heat exchange circuit 20 communicates with the outer tube 402, and the second heat exchange circuit 30 communicates with the inner tube 401. Optionally, the first medium and the second medium can be the same substance or different substances. Specifically, the first medium and the second medium can be, but are not limited to, water, coolant, and antifreeze.

[0044] In some embodiments, the inner tube 401 is connected with the second heat exchange circuit 30, and the outer tube 402 is connected with the first heat exchange circuit 20.

[0045] In the embodiment, the second medium with lower temperature flows in the inner tube 401, and the first medium with relatively higher temperature flows between the inner tube 401 and the outer tube 402, so that not only the effective heat exchange is ensured, but also the heat exchange between the second medium and the external environment is avoided, and the second medium is prevented from being heated too much, so that the cooling demand in the passenger compartment 50 is difficult to meet.

[0046] It should be understood that, when the flow rates of the first medium and the second medium are constant, the smaller the difference between the diameters of the inner tube 401 and the outer tube 402, that is, the higher the heat exchange efficiency of the inner tube 401 and the outer tube 402, the smaller the distance between the inlet and the outlet of the outer tube 402 can be set. Alternatively, the diameter of the inner tube 401 is 12 mm to 18 mm, and the diameter of the outer tube 402 is 22 mm to 25 mm.

[0047] In some embodiments, referring to Figure 5 , the cross-sectional shape of the inner tube 401 has a plurality of protrusions in the circumferential direction.

[0048] In the embodiment, the protrusions are arranged on the circumferential surface of the inner tube 401, so that the heat exchange area of the first medium and the second medium is increased, and the heat exchange efficiency is increased. It should be understood that the radial cross section of the inner tube 401 can also be circular as shown in Figure 4 , which is also a preferable embodiment.

[0049] In some embodiments, referring to Figure 6 , the inner tube 401 is spirally arranged along the length direction thereof.

[0050] In the embodiment, the heat exchange area of the first medium and the second medium is also increased, and the heat exchange efficiency is increased.

[0051] In some embodiments not shown in the drawings, the outer tube 402 is wrapped with a heat insulation layer. In this way, the medium flowing between the inner tube 401 and the outer tube 402 is prevented from exchanging heat with the external environment, and the energy loss is reduced.

[0052] In some embodiments, referring to Figure 2 , the heat exchange device 40 comprises a first branch 403 and a second branch 404. The two ends of the first branch 403 are connected with the first heat exchange circuit 20 and the second heat exchange circuit 30 respectively, and the first branch 403 is used for conveying the heat exchange medium in the first heat exchange circuit 20 to the second heat exchange circuit 30. The two ends of the second branch 404 are connected with the first heat exchange circuit 20 and the second heat exchange circuit 30 respectively, and the second branch 404 is used for conveying the heat exchange medium in the second heat exchange circuit 30 to the first heat exchange circuit 20.

[0053] The embodiment provides a specific implementation of the heat exchange device 40, which utilizes the first branch 403 and the second branch 404 to mix the first heat exchange circuit 20 and the second heat exchange circuit 30 with each other to achieve the heat exchange effect, and is ingenious in design. It should be understood that the first medium and the second medium in the embodiment are the same substance or substances that can be mixed with each other.

[0054] In some embodiments, the hydraulic pressure of the first branch 403 at the connection position with the first heat exchange circuit 20 is greater than the hydraulic pressure of the first branch 403 at the connection position with the second heat exchange circuit 30; the hydraulic pressure of the second branch 404 at the connection position with the second heat exchange circuit 30 is greater than the hydraulic pressure of the second branch 404 at the connection position with the first heat exchange circuit 20; and / or, the first branch 403 is provided with a first one-way valve 409, an inlet end of the first one-way valve 409 being in communication with the first heat exchange circuit 20, and an outlet end of the first one-way valve 409 being in communication with the second heat exchange circuit 30; the second branch 404 is provided with a second one-way valve 410, an inlet end of the second one-way valve 410 being in communication with the second heat exchange circuit 30, and an outlet end of the second one-way valve 410 being in communication with the first heat exchange circuit 20.

[0055] In the embodiment, the hydraulic pressure of the two ends of the first branch 403 and the second branch 404 in communication or the one-way valves respectively arranged on the first branch 403 and the second branch 404 are used to ensure the consistency of the flow direction of the liquid circuit and avoid backflow, thereby affecting the performance of the refrigeration system.

[0056] It should be understood that the pump body 301 respectively arranged in the first heat exchange circuit 20 and the second heat exchange circuit 30 provides power for the flow of the first medium and the second medium, and in addition, the first heat exchange circuit 20 can also be provided with a front-end cooling module, an expansion water tank, a three-electricity control system, a power motor and the like.

[0057] In some embodiments, the first branch 403 forms a first intersection point and a second intersection point on the first heat exchange circuit 20 and the second heat exchange circuit 30 respectively, the second branch 404 forms a third intersection point and a fourth intersection point on the first heat exchange circuit 20 and the second heat exchange circuit 30 respectively, the first intersection point is provided with a first three-way valve 405, the second intersection point is provided with a second three-way valve 406, the third intersection point is provided with a third three-way valve 407, and the fourth intersection point is provided with a fourth three-way valve 408; wherein at least the second three-way valve 406 is a proportional three-way valve, the flow rate of the second three-way valve 406 at the communication position of the inlet end with the first branch 403 is Q1, the flow rate of the second three-way valve 406 at the communication position of the outlet end with the second heat exchange circuit 30 is Q, and 12%≤Q1 / Q≤25% is satisfied.

[0058] In the embodiment, the three-way valve is arranged at the intersection of the branch and the heat exchange circuit, which is convenient for connection, and at least the second three-way valve 406 is a proportional three-way valve, so as to ensure that the flow of the first medium in the first heat exchange circuit 20 flowing into the second heat exchange circuit 30 should be moderate, that is, Q1 / Q should be moderate, if too large, the temperature of the second medium will be increased too much, so that it is difficult to ensure the refrigeration effect in the passenger compartment 50; if too small, it will not play a role in compensating for the loss of heat, optimizing the heat transfer efficiency, and reducing the energy consumption of the compressor 103. For example, Q1 / Q can take any one value or a range between any two values of 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24% and 25%.

[0059] In a second aspect, the application provides a vehicle comprising the air conditioning system of the first aspect.

[0060] Therefore, the vehicle of the second aspect has at least all the technical effects of the air conditioning system of the first aspect, and specific technical effects thereof will not be described here.

[0061] It should be noted that the embodiments of the application only illustrate the structures of the vehicle of the second aspect related to the improvement points of the application, but do not mean that it does not have other structures, for example, the vehicle of the second aspect also includes a power system, a heat dissipation system, etc., which will not be described one by one here.

[0062] It should be understood that the vehicle can be, but is not limited to, a traditional fuel automobile, a new energy automobile, and a flying automobile.

[0063] In particular, the term "and / or" in the application should be understood as follows:

[0064] In the first case, the term "and / or" between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) the first subject and the second subject.

[0065] In the second case, the term "and / or" between the last two subjects of three or more subjects means that at least any one of the plurality of subjects is included. For example, "the first subject, the second subject and / or the third subject" and "the first subject and / or the second subject and / or the third subject" have the same meaning, which specifically includes the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) the first subject and the second subject without the third subject; (5) the first subject and the third subject without the second subject; (6) the second subject and the third subject without the first subject; and (7) the first subject, the second subject and the third subject;

[0066] In addition, the character " / " in the present application means that the associated objects before and after it are in an "or" relationship.

[0067] Finally, although the above describes the embodiments of the present application in conjunction with the drawings, those skilled in the art can make various modifications and variations without departing from the concept of the present application, and such modifications and variations fall within the scope of the present application.

Claims

1. An air conditioning system, characterized by, The heat exchange device (40) comprises an inner tube (401) and an outer tube (402) coaxially sleeved, one of the inner tube (401) and the outer tube (402) is connected with the first heat exchange circuit (20), and the other is connected with the second heat exchange circuit (30). The inner tube (401) is connected with the second heat exchange circuit (30), and the outer tube (402) is connected with the first heat exchange circuit (20). The cross-sectional shape of the inner tube (401) has a plurality of protrusions in the circumferential direction. The inner tube (401) is spirally arranged along the length direction thereof.

2. The air conditioning system of claim 1, wherein, The outer tube (402) is wrapped with a heat insulation layer.

3. The air conditioning system of claim 2, wherein, The heat exchange device (40) comprises a first branch (403) and a second branch (404), two ends of the first branch (403) are respectively connected with the first heat exchange circuit (20) and the second heat exchange circuit (30), and the first branch (403) is used for conveying the heat exchange medium in the first heat exchange circuit (20) to the second heat exchange circuit (30).

4. The air conditioning system according to claim 2 or 3, characterized by Two ends of the second branch (404) are respectively connected with the first heat exchange circuit (20) and the second heat exchange circuit (30), and the second branch (404) is used for conveying the heat exchange medium in the second heat exchange circuit (30) to the first heat exchange circuit (20).

5. The air conditioning system according to claim 2 or 3, wherein The hydraulic pressure of the first branch (403) at the connection position with the first heat exchange circuit (20) is greater than that at the connection position with the second heat exchange circuit (30); and the hydraulic pressure of the second branch (404) at the connection position with the second heat exchange circuit (30) is greater than that at the connection position with the first heat exchange circuit (20).

6. The air conditioning system of claim 2 or 3, wherein And / or, a first one-way valve (409) is arranged on the first branch (403), an inlet end of the first one-way valve (409) is communicated with the first heat exchange circuit (20), and an outlet end of the first one-way valve (409) is communicated with the second heat exchange circuit (30); a second one-way valve (410) is arranged on the second branch (404), an inlet end of the second one-way valve (410) is communicated with the second heat exchange circuit (30), and an outlet end of the second one-way valve (410) is communicated with the first heat exchange circuit (20).

7. The air conditioning system of claim 1, wherein, ​ ​ 8. The air conditioning system of claim 7, wherein, ​ ​ 9. The air conditioning system of claim 7 or 8, wherein The first branch (403) forms a first intersection point and a second intersection point on the first heat exchange circuit (20) and the second heat exchange circuit (30) respectively, the second branch (404) forms a third intersection point and a fourth intersection point on the first heat exchange circuit (20) and the second heat exchange circuit (30) respectively, the first intersection point is provided with a first three-way valve (405), the second intersection point is provided with a second three-way valve (406), the third intersection point is provided with a third three-way valve (407), and the fourth intersection point is provided with a fourth three-way valve (408); At least the second three-way valve (406) is a proportional three-way valve, the flow rate of the communication part between the inlet end of the second three-way valve (406) and the first branch (403) is Q1, the flow rate of the communication part between the outlet end of the second three-way valve (406) and the second heat exchange circuit (30) is Q, and 12%≤Q1 / Q≤25% is satisfied.

10. A carrier, characterized by The air conditioning system comprises the air conditioning system according to any one of claims 1 to 9.

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