Heat exchange system and air conditioner

Abstract

The utility model discloses a heat exchange system and an air conditioner. The heat exchange system comprises a compressor, a switching device, a first heat exchange device and a second heat exchange device. The switching device is used for controlling the compressor to communicate with at least two of the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger and the second outdoor heat exchanger to form a heat exchange circulation loop, so that a first working mode and / or a second working mode are / is formed; in the first working mode, the first indoor heat exchanger stops heat exchange, one part of the refrigerant flows through the second indoor heat exchanger for condensation heat release, the other part of the refrigerant flows through the first outdoor heat exchanger for condensation heat release and then converges together, and then flows through the second outdoor heat exchanger for evaporation heat absorption and then returns to the compressor. The heat exchange system can achieve multiple functions and is high in energy efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a heat exchange system and an air conditioner. Background Art

[0002] Existing heat exchange systems, such as air conditioning systems, generally consist of an evaporator and a condenser. These two components make the existing heat exchange systems relatively simple in function. To increase the number of functions, an additional set of equipment with corresponding functions is usually required. This results in low energy efficiency and poor applicability of the existing heat exchange systems. Utility Model Content

[0003] The main purpose of the utility model is to provide a heat exchange system which can realize multiple functions and has high energy efficiency.

[0004] To achieve the above-mentioned purpose, the heat exchange system proposed in the present invention includes a compressor, a switching device, a first heat exchange device and a second heat exchange device;

[0005] The first heat exchange device comprises a first indoor heat exchanger and a second indoor heat exchanger;

[0006] The second heat exchange device comprises a first outdoor heat exchanger and a second outdoor heat exchanger;

[0007] The compressor is connected to the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger, and the second outdoor heat exchanger via the switching device, and the switching device is used to control the compressor to communicate with at least two of the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger, and the second outdoor heat exchanger to form a heat exchange circulation loop, so as to form a first operating mode and / or a second operating mode;

[0008] In the first working mode, the first indoor heat exchanger stops exchanging heat, a portion of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and another portion of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, then flows through the second outdoor heat exchanger to evaporate and absorb heat before returning to the compressor;

[0009] In the second working mode, the second outdoor heat exchanger stops heat exchange, a part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and the other part of the refrigerant flows through the second indoor heat exchanger to condense and release heat and then gathers together, then flows through the first indoor heat exchanger to evaporate and absorb heat and then returns to the compressor.

[0010] In one embodiment, the first heat exchange device includes at least one indoor unit, and the first indoor heat exchanger and the second indoor heat exchanger are arranged in the same indoor unit and are independent of each other.

[0011] In one embodiment, the indoor unit is a three-pipe indoor unit and has a first interface, a second interface and a third interface. The two ends of the first indoor heat exchanger are respectively connected to the first interface and the third interface, and the two ends of the second indoor heat exchanger are respectively connected to the second interface and the third interface. The three-pipe indoor unit is connected to the switching device through the first interface and the second interface, and the three-pipe indoor unit is connected to the second heat exchange device through the third interface.

[0012] In one embodiment, the switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline is connected to the first interface, and the other end of the first pipeline is connected to the compressor through the first reversing valve, one end of the second pipeline is connected to the second interface, and the other end of the second pipeline is connected to the compressor through the second reversing valve, one end of the third pipeline is connected to the third interface, and the other end of the third pipeline is connected to the first outdoor heat exchanger and the second outdoor heat exchanger.

[0013] In one embodiment, the compressor has a first intake port, a second intake port, a first exhaust port, and a second exhaust port, the first reversing valve connects the first intake port, the first exhaust port, the first pipeline, and the first outdoor heat exchanger, and the second reversing valve connects the second intake port, the second exhaust port, the second pipeline, and the second outdoor heat exchanger.

[0014] In one embodiment, the switching device further includes a first bypass pipe and a first bypass valve, the first reversing valve is connected to the first air intake port via a first connecting pipe, the second reversing valve is connected to the second air intake port via a second connecting pipe, one end of the first bypass pipe is connected to the first connecting pipe, and the other end of the first bypass pipe is connected to the second connecting pipe, the first bypass valve is provided in the first bypass pipe, and the first bypass valve is used to control the opening and closing of the first bypass pipe;

[0015] In the first operating mode or the second operating mode, the first bypass valve is opened, and the first bypass pipe is connected to the first connecting pipe and the second connecting pipe.

[0016] In one embodiment, the first heat exchange device further includes a first indoor throttling device and a second indoor throttling device, wherein the first indoor throttling device is arranged on the pipeline connecting the first indoor heat exchanger and the third interface; the second indoor throttling device is arranged on the pipeline connecting the second indoor heat exchanger and the third interface.

[0017] In one embodiment, the switching device also includes a first outdoor throttling device and a second outdoor throttling device, the first outdoor throttling device is arranged on the pipeline connecting the first outdoor heat exchanger and the third pipeline; the second outdoor throttling device is arranged on the pipeline connecting the second outdoor heat exchanger and the third pipeline.

[0018] In one embodiment, the heat exchange system further has a third working mode and / or a fourth working mode.

[0019] In the third working mode, part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and the other part of the refrigerant flows through the second outdoor heat exchanger to condense and release heat, and then is combined together, and then divided into the first indoor heat exchanger to evaporate and absorb heat, and the second indoor heat exchanger to evaporate and absorb heat, and then returns to the compressor;

[0020] In the fourth working mode, a portion of the refrigerant flows through the first indoor heat exchanger to condense and release heat, and the other portion of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and then converges together, and then is divided into the first outdoor heat exchanger to evaporate and absorb heat and the second outdoor heat exchanger to evaporate and absorb heat, and then returns to the compressor.

[0021] In one embodiment, the first heat exchange device has a first air duct, and the first indoor heat exchanger is disposed upstream of the second indoor heat exchanger along an air outlet direction of the first air duct; in the third operating mode, a pressure of the refrigerant flowing into the first indoor heat exchanger is greater than a pressure of the refrigerant flowing into the second indoor heat exchanger;

[0022] And / or, in the fourth operating mode, the pressure of the refrigerant flowing into the first indoor heat exchanger is lower than the pressure of the refrigerant flowing into the second indoor heat exchanger.

[0023] In one embodiment, the indoor unit is a four-pipe indoor unit and has a first connection port, a second connection port, a third connection port and a fourth connection port. The two ends of the first indoor heat exchanger are respectively connected to the first connection port and the second connection port, and the two ends of the second indoor heat exchanger are respectively connected to the third connection port and the fourth connection port. The four-pipe indoor unit is connected to the switching device through the first connection port and the third connection port, and the four-pipe indoor unit is connected to the second heat exchange device through the second connection port and the fourth connection port.

[0024] In one embodiment, the switching device includes the first reversing valve and the second reversing valve, and the heat exchange system also includes a first air pipe, a second air pipe, a first liquid pipe and a second liquid pipe, one end of the first air pipe is connected to the first connecting port, the other end of the first air pipe is connected to the compressor through the first reversing valve, the second connecting port is connected to the first outdoor heat exchanger through the first liquid pipe, one end of the second air pipe is connected to the third connecting port, the other end of the second air pipe is connected to the compressor through the second reversing valve, and the fourth connecting port is connected to the second outdoor heat exchanger through the second liquid pipe.

[0025] In one embodiment, the compressor has a first intake port, a second intake port, a first exhaust port, and a second exhaust port, the first reversing valve connects the first intake port, the first exhaust port, the first air pipe, and the first outdoor heat exchanger, and the second reversing valve connects the second intake port, the second exhaust port, the second air pipe, and the second outdoor heat exchanger.

[0026] In one embodiment, the switching device also includes a first bypass pipe and a first bypass valve, the first reversing valve is connected to the first air intake port through a first connecting pipe, the second reversing valve is connected to the second air intake port through a second connecting pipe, one end of the first bypass pipe is connected to the first connecting pipe, and the other end of the first bypass pipe is connected to the second connecting pipe, the first bypass valve is arranged in the first bypass pipe, and the first bypass valve is used to control the opening and closing of the first bypass pipe.

[0027] In one embodiment, the switching device further includes a second bypass pipe and a second bypass valve, one end of the second bypass pipe is connected to the first liquid pipe, the other end of the second bypass pipe is connected to the second liquid pipe, and the second bypass valve is arranged in the second bypass pipe, and the second bypass valve is used to control the opening and closing of the second bypass pipe.

[0028] The present utility model further provides a heat exchange system, comprising a compressor, a switching device, a first heat exchange device, and a second heat exchange device. The first heat exchange device comprises at least one three-pipe indoor unit, the three-pipe indoor unit comprising a first indoor heat exchanger, a second indoor heat exchanger, a first interface, a second interface, and a third interface. The first indoor heat exchanger is connected at both ends to the first interface and the third interface, respectively. The second indoor heat exchanger is connected at both ends to the second interface and the third interface, respectively. The three-pipe indoor unit is connected to the switching device via the first interface and the second interface, and the three-pipe indoor unit is connected to the second heat exchange device via the third interface.

[0029] The second heat exchange device comprises a first outdoor heat exchanger and a second outdoor heat exchanger;

[0030] The switching device is used to control the refrigerant discharged from the compressor to flow through at least two of the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger, and the second outdoor heat exchanger to form a third operating mode and / or a fourth operating mode;

[0031] In the third working mode, part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and the other part of the refrigerant flows through the second outdoor heat exchanger to condense and release heat, and then is combined together, and then divided into the first indoor heat exchanger to evaporate and absorb heat, and the second indoor heat exchanger to evaporate and absorb heat, and then returns to the compressor;

[0032] In the fourth working mode, a portion of the refrigerant flows through the first indoor heat exchanger to condense and release heat, and the other portion of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and then converges together, and then is divided into the first outdoor heat exchanger to evaporate and absorb heat and the second outdoor heat exchanger to evaporate and absorb heat, and then returns to the compressor.

[0033] In one embodiment, the three-pipe indoor unit has a first air duct, and the first indoor heat exchanger is arranged upstream of the second indoor heat exchanger along the air outlet direction of the first air duct; in the third operating mode, the refrigerant pressure flowing into the first indoor heat exchanger is greater than the refrigerant pressure flowing into the second indoor heat exchanger;

[0034] And / or, in the fourth operating mode, the pressure of the refrigerant flowing into the first indoor heat exchanger is lower than the pressure of the refrigerant flowing into the second indoor heat exchanger.

[0035] In one embodiment, the switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline is connected to the first interface, and the other end of the first pipeline is connected to the compressor through the first reversing valve, one end of the second pipeline is connected to the second interface, and the other end of the second pipeline is connected to the compressor through the second reversing valve, one end of the third pipeline is connected to the third interface, and the other end of the third pipeline is connected to the first outdoor heat exchanger and the second outdoor heat exchanger.

[0036] In one embodiment, the compressor has a first intake port, a second intake port, a first exhaust port, and a second exhaust port, the first reversing valve connects the first intake port, the first exhaust port, the first pipeline, and the first outdoor heat exchanger, and the second reversing valve connects the second intake port, the second exhaust port, the second pipeline, and the second outdoor heat exchanger.

[0037] The present invention also provides an air conditioner, which includes the heat exchange system as described above.

[0038] The heat exchange system of the utility model includes a compressor, a switching device, a first heat exchange device and a second heat exchange device, the switching device is used to control the compressor to be connected with at least two of the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger and the second outdoor heat exchanger to form a heat exchange circulation loop to form a first working mode and / or a second working mode; in the first working mode, the first indoor heat exchanger stops heat exchange, a part of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and performs indoor heating, and the other part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and performs outdoor defrosting, the refrigerant after indoor heating and the refrigerant after outdoor defrosting are gathered together, and then flow through the second outdoor heat exchanger to evaporate and absorb heat and then return to the compressor, so that in the circulation process of the refrigerant, the heat exchange system simultaneously realizes the functions of indoor heating and outdoor defrosting, that is, in the first working mode, the heat exchange system realizes the function of inductive defrosting, and the first indoor heat exchanger stops heat exchange, and defrosting does not need to absorb heat from the indoor room, and the heat exchange system has high energy efficiency.

[0039] In the second working mode, the second outdoor heat exchanger stops heat exchange, a part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and the other part of the refrigerant flows through the second indoor heat exchanger to condense and release heat to heat the indoor room. The refrigerants after heat release gather together and then flow through the first indoor heat exchanger to evaporate and absorb heat, so that the water vapor in the indoor air is cooled and liquefied into water, dehumidifying the indoor room, and finally returns to the compressor. In this way, during the circulation of the refrigerant, the heat released by the refrigerant flowing through the second indoor heat exchanger heats the cooled air, achieving the effect of dehumidification without cooling. The heat exchange system simultaneously realizes the functions of indoor heating and indoor dehumidification, that is, in the second working mode, the heat exchange system realizes the function of constant temperature dehumidification, and the second outdoor heat exchanger stops heat exchange, and the second indoor heat exchanger heats the air, which is equivalent to recovering the heat of part of the refrigerant flowing through the first indoor heat exchanger, making the heat exchange system energy-efficient.

[0040] It can be seen that the heat exchange system of the present application, in the first working mode, the heat exchange system simultaneously realizes the functions of indoor heating and outdoor defrosting, and the heat exchange system has high energy efficiency; in the second working mode, the heat exchange system simultaneously realizes the functions of indoor heating and indoor dehumidification, and the heat exchange system has high energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0042] Figure 1A schematic structural diagram of a first embodiment of a heat exchange system provided by the present utility model;

[0043] Figure 2 for Figure 1 A schematic structural diagram of the heat exchange system in the first working mode;

[0044] Figure 3 for Figure 1 A schematic structural diagram of the heat exchange system in the second working mode;

[0045] Figure 4 for Figure 1 A schematic structural diagram of the heat exchange system in the third working mode;

[0046] Figure 5 for Figure 1 A schematic structural diagram of the heat exchange system in the fourth working mode;

[0047] Figure 6 This is a schematic structural diagram of a second embodiment of a heat exchange system provided by the present utility model;

[0048] Figure 7 for Figure 6 A schematic structural diagram of the heat exchange system in the first working mode;

[0049] Figure 8 for Figure 6 Schematic diagram of the structure of the heat exchange system in the second working mode.

[0050] Description of Figure Numbers:

[0051] 10. Heat exchange system;

[0052] 100, compressor; 110, first air intake; 120, second air intake; 130, first air exhaust; 140, second air exhaust;

[0053] 200, switching device; 210, first reversing valve; 220, second reversing valve; 230, first bypass pipe; 240, first bypass valve; 250, first outdoor throttle element; 260, second outdoor throttle element; 270, second bypass pipe; 280, second bypass valve;

[0054] 300, first heat exchange device; 301, three-pipe indoor unit; 302, four-pipe indoor unit; 310, first indoor heat exchanger; 320, second indoor heat exchanger; 330, first indoor throttling element; 340, second indoor throttling element;

[0055] 400, second heat exchange device; 410, first outdoor heat exchanger; 420, second outdoor heat exchanger;

[0056] 11. First pipeline; 12. Second pipeline; 13. Third pipeline; 14. First connecting pipe; 15. Second connecting pipe; 16. First air pipe; 17. Second air pipe; 18. First liquid pipe; 19. Second liquid pipe.

[0057] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0059] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0060] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0061] Existing heat exchange systems, such as air conditioning systems, generally consist of an evaporator and a condenser. These two components make the existing heat exchange systems relatively simple in function. To increase the number of functions, an additional set of equipment with corresponding functions is usually required. This results in low energy efficiency and poor applicability of the existing heat exchange systems.

[0062] In order to solve the above problems, the present application proposes a heat exchange system and an air conditioner including the heat exchange system, wherein the heat exchange system can realize multiple functions and has high energy efficiency.

[0063] See also Figure 1 In an embodiment of the heat exchange system 10 of the present invention, the heat exchange system 10 includes a compressor 100, a switching device 200, a first heat exchange device 300 and a second heat exchange device 400; the first heat exchange device 300 includes a first indoor heat exchanger 310 and a second indoor heat exchanger 320; the second heat exchange device 400 includes a first outdoor heat exchanger 410 and a second outdoor heat exchanger 420;

[0064] The compressor 100 is connected to the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410, and the second outdoor heat exchanger 420 via the switching device 200. The switching device 200 is used to control the compressor 100 to be connected to at least two of the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410, and the second outdoor heat exchanger 420 to form a heat exchange circulation loop to form a first working mode and / or a second working mode; in the first working mode (such as Figure 2 As shown), the first indoor heat exchanger 310 stops heat exchange, a part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat, and the other part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and then flows through the second outdoor heat exchanger 420 to evaporate and absorb heat before returning to the compressor 100; in the second working mode (as shown), Figure 3 As shown), the second outdoor heat exchanger 420 stops heat exchange, a part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and the other part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat and then gathers together, and then flows through the first indoor heat exchanger 310 to evaporate and absorb heat and then returns to the compressor 100.

[0065] It is understandable that the heat exchangers, such as the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420, all have heat exchange channels. The specific number and shape of the heat exchange channels are not limited. For example, they can be tubular or sheet-shaped, and of course they can also be in other shapes. The switching device 200 is used to control the refrigerant discharged from the compressor 100 to flow through at least two of the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 to form a heat exchange circulation loop. That is, the compression device is connected to any two of the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 through the switching device 200 to form a heat exchange circulation loop; or, the compression device is connected to any two of the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 through the switching device 200 to form a heat exchange circulation loop; 00 is connected with any three of the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 to form a heat exchange circulation loop; of course, the compression device can also be connected with the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 through the switching device 200 to form a heat exchange circulation loop; wherein, the order in which the refrigerant flows through the heat exchanger is not limited, as long as it can form a heat exchange circulation loop.

[0066] See also Figure 2 In the first operating mode, the first indoor heat exchanger 310 stops exchanging heat, indicating that the refrigerant in the first indoor heat exchanger 310 does not flow, or the first indoor heat exchanger 310 operates at a very low power. The refrigerant in the first indoor heat exchanger 310 does not flow, causing the first indoor heat exchanger 310 to completely stop exchanging heat. The first indoor heat exchanger 310 operates at a very low power, and the heat exchange efficiency of the first indoor heat exchanger 310 is very low. For example, the ratio of the current operating power of the first indoor heat exchanger 310 to the rated power is not greater than 0.2. The specific ratio may be 0.05, 0.1, 0.15, or 0.2. In the first operating mode, the first indoor heat exchanger 310 stops exchanging heat, which helps shorten the flow path of the refrigerant in the circulation loop, reduces the power consumption of the heat exchange system 10, and thus helps improve the energy efficiency of the heat exchange system 10.

[0067] See also Figure 3In the second operating mode, the second outdoor heat exchanger 420 stops exchanging heat, indicating that the refrigerant in the second outdoor heat exchanger 420 does not flow, or the second outdoor heat exchanger 420 operates at a very low power. The refrigerant in the second outdoor heat exchanger 420 does not flow, causing the second outdoor heat exchanger 420 to completely stop exchanging heat. The second outdoor heat exchanger 420 operates at a very low power, and the heat exchange efficiency of the second outdoor heat exchanger 420 is very low. For example, the ratio of the current operating power of the second outdoor heat exchanger 420 to the rated power is no greater than 0.2. The specific ratio may be 0.05, 0.1, 0.15, or 0.2. In the second operating mode, the second outdoor heat exchanger 420 stops exchanging heat, which helps shorten the flow path of the refrigerant in the circulation loop, reduces the power consumption of the heat exchange system 10, and thus helps improve the energy efficiency of the heat exchange system 10.

[0068] It should be noted that the arrows in the drawings in the specification indicate the direction of refrigerant flow.

[0069] The heat exchange system 10 of the present invention includes a compressor 100, a switching device 200, a first heat exchange device 300 and a second heat exchange device 400. The switching device 200 is used to control the compressor 100 to communicate with at least two of the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 to form a heat exchange circulation loop, thereby forming a first working mode and / or a second working mode. In the first working mode, the first indoor heat exchanger 310 stops heat exchange, and a part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat. The indoor heating is performed, and the other part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat for outdoor defrosting. The refrigerant after indoor heating and the refrigerant after outdoor defrosting are gathered together, and then flow through the second outdoor heat exchanger 420 to evaporate and absorb heat and then return to the compressor 100. In this way, during the flow of the refrigerant, the heat exchange system 10 simultaneously realizes the functions of indoor heating and outdoor defrosting, that is, in the first working mode, the heat exchange system 10 realizes the function of inductive defrosting, and the first indoor heat exchanger 310 stops heat exchange, and defrosting does not need to absorb heat from the indoor room, and the heat exchange system 10 has high energy efficiency.

[0070] In the second working mode, the second outdoor heat exchanger 420 stops heat exchange, a part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and the other part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat to heat the indoor room. The refrigerants after heat release gather together and then flow through the first indoor heat exchanger 310 to evaporate and absorb heat, so that the water vapor in the indoor air is cooled and liquefied into water, dehumidifying the indoor room, and finally returns to the compressor 100. In this way, during the circulation of the refrigerant, the heat released by the refrigerant flowing through the second indoor heat exchanger 320 heats the cooled air, achieving the effect of dehumidification without cooling. The heat exchange system 10 simultaneously realizes the functions of indoor heating and indoor dehumidification, that is, in the second working mode, the heat exchange system 10 realizes the function of constant temperature dehumidification, and the second outdoor heat exchanger 420 stops heat exchange, and the second indoor heat exchanger 320 heating the air is equivalent to recovering the heat of part of the refrigerant flowing through the first indoor heat exchanger 310, so that the heat exchange system 10 has high energy efficiency.

[0071] It can be seen that the heat exchange system 10 of the present application, in the first working mode, the heat exchange system 10 simultaneously realizes the functions of indoor heating and outdoor defrosting, and the heat exchange system 10 has high energy efficiency; in the second working mode, the heat exchange system 10 simultaneously realizes the functions of indoor heating and indoor dehumidification, and the heat exchange system 10 has high energy efficiency.

[0072] In one embodiment, the first heat exchange device 300 includes at least one indoor unit, wherein the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are disposed within the same indoor unit and are independent of each other. This arrangement means that the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are two independent heat exchangers, both disposed within the same indoor unit housing. Specifically, the indoor unit includes a first housing, and the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are both disposed within the first housing and can operate independently. This allows the heat exchange system 10 to have at least a first operating mode and a second operating mode, providing enhanced functionality.

[0073] In one embodiment, the indoor unit is a three-pipe indoor unit 301, and has a first interface, a second interface and a third interface. The two ends of the first indoor heat exchanger 310 are respectively connected to the first interface and the third interface, and the two ends of the second indoor heat exchanger 320 are respectively connected to the second interface and the third interface. The three-pipe indoor unit 301 is connected to the switching device 200 through the first interface and the second interface, and the three-pipe indoor unit 301 is connected to the second heat exchange device 400 through the third interface.

[0074] It can be understood that the indoor unit is a three-pipe indoor unit 301. In the first working mode, the first indoor heat exchanger 310 stops heat exchange, and the refrigerant does not flow in the first interface and the first indoor heat exchanger 310. This is conducive to shortening the flow path of the refrigerant in the three-pipe indoor unit 301, reducing the power consumption of the heat exchange system 10, and thus helping to improve the energy efficiency of the heat exchange system 10.

[0075] The indoor unit is a three-pipe indoor unit 301. In the second working mode, a part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat to heat the indoor room, and then flows through the first indoor heat exchanger 310 to evaporate and absorb heat, so that the water vapor in the indoor air is cooled and liquefied into water to dehumidify the indoor room. In the three-pipe indoor unit 301, the heat released by the refrigerant flowing through the second indoor heat exchanger 320 heats the air cooled by the first indoor heat exchanger 310. This is equivalent to the second indoor heat exchanger 320 recovering the heat of part of the refrigerant flowing through the first indoor heat exchanger 310, that is, the three-pipe indoor unit 301 can recover heat in the second working mode, thereby improving the energy efficiency of the heat exchange system 10.

[0076] See also Figure 3 In one embodiment, the switching device 200 includes a first reversing valve 210 and a second reversing valve 220, and the heat exchange system 10 also includes a first pipeline 11, a second pipeline 12 and a third pipeline 13, one end of the first pipeline 11 is connected to the first interface, and the other end of the first pipeline 11 is connected to the compressor 100 through the first reversing valve 210, one end of the second pipeline 12 is connected to the second interface, and the other end of the second pipeline 12 is connected to the compressor 100 through the second reversing valve 220, one end of the third pipeline 13 is connected to the third interface, and the other end of the third pipeline 13 is connected to the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420.

[0077] It can be understood that the three-pipe indoor unit 301 is connected to the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 through the third pipe 13. In the first working mode, the refrigerant flowing out of the second indoor heat exchanger 320 of the three-pipe indoor unit 301 flows into the third pipe 13, and the third pipe 13 then diverts the refrigerant to the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420. This makes the structure of the first heat exchange device 300 connecting the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 simple, which is conducive to reducing the number of pipes, thereby optimizing the pipeline layout of the heat exchange system 10.

[0078] In the second working mode, a part of the refrigerant flows through the first outdoor heat exchanger 410 and then flows into the third pipeline 13, and the other part of the refrigerant flows through the second indoor heat exchanger 320 and then flows to the third interface. The third pipeline 13 is connected to the third interface, so that a part of the refrigerant flowing out of the third pipeline 13 and the refrigerant flowing out of the second indoor heat exchanger 320 converge at the third interface, and then flow through the first indoor heat exchanger 310 and return to the compressor 100.

[0079] In one embodiment, the first reversing valve 210 and the second reversing valve 220 may be composed of multiple valve bodies or may be four-way reversing valves, without limitation. In this embodiment, the first reversing valve 210 comprises a four-way reversing valve; and / or the second reversing valve 220 comprises a four-way reversing valve. The provision of a four-way reversing valve allows for simple and effective switching of refrigerant flow direction, resulting in a simple structure and ease of assembly for the heat exchange system 10.

[0080] In one embodiment, the compressor 100 has a first air intake port 110, a second air intake port 120, a first exhaust port 130 and a second exhaust port 140, the first reversing valve 210 connects the first air intake port 110, the first exhaust port 130, the first pipeline 11 and the first outdoor heat exchanger 410, and the second reversing valve 220 connects the second air intake port 120, the second exhaust port 140, the second pipeline 12 and the second outdoor heat exchanger 420.

[0081] It is understandable that the first air intake port 110 and the second air intake port 120 return air independently, and the air intake pressures of the first air intake port 110 and the second air intake port 120 can be the same or different; the first air exhaust port 130 and the second air exhaust port 140 exhaust air independently, and the air exhaust pressures of the first air exhaust port 130 and the second air exhaust port 140 can be the same or different, so that the refrigerant pressure flowing into the first heat exchange device 300 or the second heat exchange device 400 can be the same or different, thereby meeting the needs of different working modes. In this solution, the compressor 100 is a double-suction double-row compressor 100, specifically a double-cylinder double-suction double-row compressor 100, which uses two compression cylinders to work simultaneously, thereby increasing the air intake and exhaust volumes of the compressor 100, thereby improving the compression capacity of the compressor 100, which is beneficial to improving the energy efficiency of the heat exchange system 10.

[0082] In the first working mode or the second working mode, the exhaust pressures of the first exhaust port 130 and the second exhaust port 140 are different. The first exhaust port 130 is connected to the first outdoor heat exchanger 410, and the second exhaust port 140 is connected to the second indoor heat exchanger 320, so that the second indoor heat exchanger 320 and the first outdoor heat exchanger 410 can have different condensing temperatures and condensing pressures, that is, the refrigerant discharged from the first exhaust port 130 and the second exhaust port 140 of the compressor 100 has a pressure difference. This high and low pressure design can reduce the pressure ratio of the compressor 100, so that the compressor 100 has high energy efficiency.

[0083] See also Figures 1 to 3 In one embodiment, the switching device 200 further includes a first bypass pipe 230 and a first bypass valve 240. The first reversing valve 210 is connected to the first air intake port 110 through the first connecting pipe 14, and the second reversing valve 220 is connected to the second air intake port 120 through the second connecting pipe 15. One end of the first bypass pipe 230 is connected to the first connecting pipe 14, and the other end of the first bypass pipe 230 is connected to the second connecting pipe 15. The first bypass valve 240 is arranged in the first bypass pipe 230, and the first bypass valve 240 is used to control the on and off of the first bypass pipe 230; in the first working mode or the second working mode, the first bypass valve 240 is opened, and the first bypass pipe 230 connects the first connecting pipe 14 and the second connecting pipe 15.

[0084] It can be understood that in the first working mode, a part of the refrigerant flowing out of the second connecting pipe 15 flows through the second air intake port 120 and returns to the compressor 100. By setting the first bypass pipe 230 and the first bypass valve 240, the first bypass valve 240 is opened, so that the other part of the refrigerant in the second connecting pipe 15 can be diverted along the first bypass pipe 230 to the first connecting pipe 14 and flow through the first air intake port 110 and return to the compressor 100, so as to realize the double suction and double discharge functions of the compressor 100 and the inductive defrosting function of the heat exchange system 10. In the second operating mode, a portion of the refrigerant flowing out of the first connecting pipe 14 flows through the first air intake port 110 and returns to the compressor 100. By providing a first bypass pipe 230 and a first bypass valve 240, the first bypass valve 240 is opened, allowing the remaining portion of the refrigerant in the first connecting pipe 14 to be diverted along the first bypass pipe 230 to the second connecting pipe 15 and flow through the second air intake port 120 and return to the compressor 100, thereby achieving the double-suction and double-discharge functions of the compressor 100 and the constant-temperature dehumidification functions of the heat exchange system 10. The connection method of the first bypass pipe 230 and the first bypass valve 240 in the heat exchange system 10 is simple, making it easy for the heat exchange system 10 to achieve the functions of non-sensitive defrosting and constant-temperature dehumidification. In addition, the first bypass valve 240 can be a solenoid valve, specifically a one-way solenoid valve.

[0085] See also Figure 1 In one embodiment, the first heat exchange device 300 further includes a first indoor throttling device 330 and a second indoor throttling device 340. The first indoor throttling device 330 is arranged on the pipeline connecting the first indoor heat exchanger 310 and the third interface; the second indoor throttling device 340 is arranged on the pipeline connecting the second indoor heat exchanger 320 and the third interface.

[0086] It will be understood that the first indoor throttle 330 is used to throttle the first indoor heat exchanger 310, controlling the flow rate and flow rate of the refrigerant. When the first indoor heat exchanger 310 is cooling, the first indoor throttle 330 functions to throttle and reduce pressure; when the first indoor heat exchanger 310 is heating, the first indoor throttle 330 functions to adjust the degree of subcooling. For another example, when the first indoor throttle 330 is closed, the pipeline in which the first indoor throttle 330 is located is not connected, and the first indoor heat exchanger 310 does not perform heat exchange. Similarly, the second indoor throttle 340 is used to throttle the second indoor heat exchanger 320. The operating principles of the second indoor throttle 340 are similar to those of the first indoor throttle 330 and will not be described in detail here. In addition, both the first indoor throttle 330 and the second indoor throttle 340 may be electronic expansion valves.

[0087] In one embodiment, the switching device 200 also includes a first outdoor throttling device 250 and a second outdoor throttling device 260, wherein the first outdoor throttling device 250 is arranged on the pipeline connecting the first outdoor heat exchanger 410 and the third pipeline 13; the second outdoor throttling device 260 is arranged on the pipeline connecting the second outdoor heat exchanger 420 and the third pipeline 13.

[0088] It is understood that the first outdoor throttle 250 is used to throttle the first outdoor heat exchanger 410, and the second outdoor throttle 260 is used to throttle the second outdoor heat exchanger 420 to control the flow rate and flow of the refrigerant, so that the heat exchange system 10 can have multiple operating modes. Both the first outdoor throttle 250 and the second outdoor throttle 260 can be electronic expansion valves.

[0089] In one embodiment, the first heat exchange device 300 includes at least one indoor unit, which is a three-pipe indoor unit 301. The first indoor heat exchanger 310 and the second indoor heat exchanger 320 are disposed in the three-pipe indoor unit 301.

[0090] See also Figure 3 and Figure 4 In one embodiment, the heat exchange system 10 further has a third working mode and / or a fourth working mode. In the third working mode (such as Figure 4As shown), part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and the other part of the refrigerant flows through the second outdoor heat exchanger 420 to condense and release heat, and then is gathered together, and then divided into the first indoor heat exchanger 310 to evaporate and absorb heat, and the second indoor heat exchanger 320 to evaporate and absorb heat, and then returns to the compressor 100; in the fourth working mode (as Figure 5 As shown), a part of the refrigerant flows through the first indoor heat exchanger 310 to condense and release heat, and the other part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat and then gathers together, and then is divided into the first outdoor heat exchanger 410 to evaporate and absorb heat and the second outdoor heat exchanger 420 to evaporate and absorb heat and then returns to the compressor 100.

[0091] It is understandable that if Figure 4 As shown, in the third working mode, a part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and another part of the refrigerant flows through the second outdoor heat exchanger 420 to condense and release heat and then gathers together. A part of the refrigerant is diverted to the first indoor heat exchanger 310 to evaporate and absorb heat for indoor cooling, and then returns to the compressor 100. The other part of the refrigerant is diverted to the second indoor heat exchanger 320 to evaporate and absorb heat for indoor cooling, and then returns to the compressor 100. In this way, during the circulation of the refrigerant, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have dual evaporation temperatures and evaporation pressures for indoor cooling, which is beneficial to the stepped heat exchange in the first heat exchange device 300, that is, the stepped cooling in the indoor unit is realized, and the energy efficiency of the heat exchange system 10 is improved.

[0092] like Figure 5 As shown, in the fourth working mode, a part of the refrigerant flows through the first indoor heat exchanger 310 to condense and release heat for indoor heating, and the other part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat for indoor heating. The refrigerants after heat release are gathered together and then diverted to the first outdoor heat exchanger 410 to evaporate and absorb heat and the second outdoor heat exchanger 420 to evaporate and absorb heat and then return to the compressor 100. In this way, during the circulation of the refrigerant, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have dual condensing temperatures and condensing pressures for indoor heating, which is beneficial to the step heat exchange in the first heat exchange device 300, that is, the step heating in the indoor unit is realized, and the energy efficiency of the heat exchange system 10 is improved.

[0093] In one embodiment, the first heat exchange device 300 has a first air duct, and the first indoor heat exchanger 310 is arranged upstream of the second indoor heat exchanger 320 along the air outlet direction of the first air duct; in the third working mode, the refrigerant pressure flowing into the first indoor heat exchanger 310 is greater than the refrigerant pressure flowing into the second indoor heat exchanger 320.

[0094] It can be understood that in the third working mode, the heat exchange system 10 performs indoor cooling, and the air first flows through the first indoor heat exchanger 310 in the first air duct, and then flows through the second indoor heat exchanger 320 and is blown out of the first heat exchange device 300. The refrigerant flowing into the first indoor heat exchanger 310 is a high-pressure refrigerant with a high evaporation pressure relative to the refrigerant flowing into the second indoor heat exchanger 320. The refrigerant flowing into the first indoor heat exchanger 310 is a medium-pressure refrigerant with a low evaporation pressure. In this way, the refrigerant pressure in the first heat exchange device 300 can be set in a gradient in the third working mode, and the high Compared with medium-pressure refrigerant, high-pressure refrigerant is more conducive to improving the cooling capacity. When the air flows through the first indoor heat exchanger 310 and the second indoor heat exchanger 320, the air first flows through the high-pressure refrigerant in the first heat exchange device 300, and then flows through the medium-pressure refrigerant. The air cooled by the high-pressure refrigerant is blown into the room in the direction of the air cooled by the medium-pressure refrigerant, which is conducive to lowering the indoor cooling temperature. The refrigerant in the first indoor heat exchanger 310 and the second indoor heat exchanger 320 flowing into the first heat exchange device 300 adopts a high and low pressure setting, and the indoor unit adopts a step-by-step heat exchange, which is conducive to reducing the pressure ratio of the compressor 100, thereby improving the energy efficiency of the heat exchange system 10.

[0095] In one embodiment, the compressor 100 has a first exhaust port 130 and a second exhaust port 140. In a third operating mode, the exhaust pressure of the first exhaust port 130 is greater than the exhaust pressure of the second exhaust port 140. With this arrangement, in the third operating mode, the first exhaust port 130 and the second exhaust port 140 of the compressor 100 discharge refrigerants of different pressures, with the first exhaust port 130 discharging high-pressure refrigerant and the second exhaust port 140 discharging medium-pressure refrigerant. This facilitates achieving a higher pressure of the refrigerant flowing into the first indoor heat exchanger 310 than that flowing into the second indoor heat exchanger 320 without requiring an additional pressure regulating device. This facilitates simplifying the structure of the heat exchange system 10 and ensures that, in the third operating mode, the refrigerant in the first heat exchange device 300 can adopt a high-low pressure design, thereby reducing the pressure ratio of the compressor 100 and improving the energy efficiency of the heat exchange system 10.

[0096] In one embodiment, the first heat exchange device 300 has a first air duct, and the first indoor heat exchanger 310 is arranged upstream of the second indoor heat exchanger 320 along the air outlet direction of the first air duct. In the fourth working mode, the pressure of the refrigerant flowing into the first indoor heat exchanger 310 is less than the pressure of the refrigerant flowing into the second indoor heat exchanger 320.

[0097] It can be understood that in the fourth working mode, the heat exchange system 10 performs indoor heating, and the air first flows through the first indoor heat exchanger 310 in the first air duct, and then flows through the second indoor heat exchanger 320 and is blown out of the first heat exchange device 300. The refrigerant flowing into the first indoor heat exchanger 310 is relative to the refrigerant flowing into the second indoor heat exchanger 320. The refrigerant flowing into the first indoor heat exchanger 310 is a medium-pressure refrigerant with a low condensing pressure, and the refrigerant flowing into the second indoor heat exchanger 320 is a high-pressure refrigerant with a high condensing pressure. In this way, the refrigerant pressure in the first heat exchange device 300 can be set in a gradient in the fourth working mode, and the high Compared with medium-pressure refrigerant, high-pressure refrigerant is more conducive to increasing the heating amount. When the air flows through the first indoor heat exchanger 310 and the second indoor heat exchanger 320, the air first flows through the medium-pressure refrigerant in the first heat exchange device 300, and then flows through the high-pressure refrigerant. The air heated by the medium-pressure refrigerant is blown into the room in the direction of the air heated by the high-pressure refrigerant, which is conducive to increasing the indoor heating temperature. The refrigerant in the first indoor heat exchanger 310 and the second indoor heat exchanger 320 flowing into the first heat exchange device 300 adopts a high and low pressure setting, and the indoor unit uses step-by-step heat exchange, which is conducive to reducing the pressure ratio of the compressor 100, thereby improving the energy efficiency of the heat exchange system 10.

[0098] In one embodiment, the compressor 100 has a first exhaust port 130 and a second exhaust port 140. In a fourth operating mode, the exhaust pressure of the first exhaust port 130 is lower than the exhaust pressure of the second exhaust port 140. With this arrangement, in the fourth operating mode, the first exhaust port 130 and the second exhaust port 140 of the compressor 100 discharge refrigerants of different pressures, with the first exhaust port 130 discharging medium-pressure refrigerant and the second exhaust port 140 discharging high-pressure refrigerant. This facilitates achieving a lower pressure of the refrigerant flowing into the first indoor heat exchanger 310 than that flowing into the second indoor heat exchanger 320 without requiring an additional pressure regulating device. This facilitates simplifying the structure of the heat exchange system 10 and ensures that, in the fourth operating mode, the refrigerant in the first heat exchange device 300 can adopt a high-low pressure design, thereby reducing the pressure ratio of the compressor 100 and improving the energy efficiency of the heat exchange system 10.

[0099] See also Figure 6 In another embodiment, the indoor unit is a four-pipe indoor unit 302, and has a first connection port, a second connection port, a third connection port and a fourth connection port. The two ends of the first indoor heat exchanger 310 are respectively connected to the first connection port and the second connection port, and the two ends of the second indoor heat exchanger 320 are respectively connected to the third connection port and the fourth connection port. The four-pipe indoor unit 302 is connected to the switching device 200 through the first connection port and the third connection port, and the four-pipe indoor unit 302 is connected to the second heat exchange device 400 through the second connection port and the fourth connection port.

[0100] It will be appreciated that, compared to the three-pipe indoor unit 301, the four-pipe indoor unit 302 has a different connection method with the second heat exchange device 400. Specifically, the four-pipe indoor unit 302 has a different connection method with the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420. For example, the four-pipe indoor unit 302 is connected to the first outdoor heat exchanger 410 via the second connection port, and the four-pipe indoor unit 302 is connected to the second outdoor heat exchanger 420 via the fourth connection port. The first indoor heat exchanger 310 and the second indoor heat exchanger 320 of the four-pipe indoor unit 302 can flexibly adjust the heat exchange temperature as needed, independently performing cooling or heating, thereby improving installation flexibility and heat exchange efficiency.

[0101] See also Figure 6 In one embodiment, the switching device 200 includes a first reversing valve 210 and a second reversing valve 220. The heat exchange system 10 also includes a first gas pipe 16, a second gas pipe 17, a first liquid pipe 18, and a second liquid pipe 19. One end of the first gas pipe 16 is connected to the first connection port, the other end of the first gas pipe 16 is connected to the compressor 100 via the first reversing valve 210, the second connection port is connected to the first outdoor heat exchanger 410 via the first liquid pipe 18, one end of the second gas pipe 17 is connected to the third connection port, the other end of the second gas pipe 17 is connected to the compressor 100 via the second reversing valve 220, and the fourth connection port is connected to the second outdoor heat exchanger 420 via the second liquid pipe 19. With this arrangement, the first reversing valve 210 and the second reversing valve 220 can adjust the flow direction of the refrigerant in the heat exchange system 10, enabling the heat exchange system 10 to perform multiple functions. For example, the compressor 100 is connected to the first indoor heat exchanger 310 and the first outdoor heat exchanger 410 through the first reversing valve 210 to form a first circulation loop, and the compressor 100 is connected to the second indoor heat exchanger 320 and the second outdoor heat exchanger 420 through the second reversing valve 220 to form a second circulation loop. The refrigerant flows through the first circulation loop and / or the second circulation loop to achieve the function of indoor cooling or heating.

[0102] In one embodiment, the compressor 100 has a first air intake port 110, a second air intake port 120, a first air exhaust port 130 and a second air exhaust port 140, the first reversing valve 210 connects the first air intake port 110, the first air exhaust port 130, the first air pipe 16 and the first outdoor heat exchanger 410, and the second reversing valve 220 connects the second air intake port 120, the second air exhaust port 140, the second air pipe 17 and the second outdoor heat exchanger 420.

[0103] It is understandable that the first air intake port 110 and the second air intake port 120 return air independently, and the air intake pressures of the first air intake port 110 and the second air intake port 120 can be the same or different; the first air exhaust port 130 and the second air exhaust port 140 exhaust air independently, and the air exhaust pressures of the first air exhaust port 130 and the second air exhaust port 140 can be the same or different, so that the refrigerant pressure flowing into the first heat exchange device 300 or the second heat exchange device 400 can be the same or different, thereby meeting the needs of different working modes. In this solution, the compressor 100 is a double-suction double-row compressor 100, specifically a double-cylinder double-suction double-row compressor 100, which uses two compression cylinders to work simultaneously, thereby increasing the air intake and exhaust volumes of the compressor 100, thereby improving the compression capacity of the compressor 100, which is beneficial to improving the energy efficiency of the heat exchange system 10.

[0104] See also Figures 6 to 8 In one embodiment, the switching device 200 further includes a first bypass pipe 230 and a first bypass valve 240. The first reversing valve 210 is connected to the first air intake port 110 through a first connecting pipe 14, and the second reversing valve 220 is connected to the second air intake port 120 through a second connecting pipe 15. One end of the first bypass pipe 230 is connected to the first connecting pipe 14, and the other end of the first bypass pipe 230 is connected to the second connecting pipe 15. The first bypass valve 240 is arranged in the first bypass pipe 230, and the first bypass valve 240 is used to control the on and off of the first bypass pipe 230.

[0105] It is understood that in the first operating mode or the second operating mode, the first bypass valve 240 is open, and the first bypass pipe 230 connects the first connecting pipe 14 and the second connecting pipe 15. Specifically, in the first operating mode, a portion of the refrigerant flowing out of the second connecting pipe 15 flows through the second air intake port 120 and returns to the compressor 100. By providing the first bypass pipe 230 and the first bypass valve 240, the first bypass valve 240 is opened, allowing the other portion of the refrigerant in the second connecting pipe 15 to be diverted along the first bypass pipe 230 to the first connecting pipe 14 and flow through the first air intake port 110 and return to the compressor 100, thereby achieving the double-suction and double-exhaust functions of the compressor 100 and the inductive defrosting function of the heat exchange system 10. In the second operating mode, a portion of the refrigerant flowing out of the first connecting pipe 14 flows through the first air intake port 110 and returns to the compressor 100. By providing a first bypass pipe 230 and a first bypass valve 240, the first bypass valve 240 is opened, allowing the remaining portion of the refrigerant in the first connecting pipe 14 to be diverted along the first bypass pipe 230 to the second connecting pipe 15 and flow through the second air intake port 120 and return to the compressor 100, thereby achieving the double-suction and double-discharge functions of the compressor 100 and the constant-temperature dehumidification functions of the heat exchange system 10. The connection method of the first bypass pipe 230 and the first bypass valve 240 in the heat exchange system 10 is simple, making it easy for the heat exchange system 10 to achieve the functions of non-sensitive defrosting and constant-temperature dehumidification. In addition, the first bypass valve 240 can be a solenoid valve, specifically a one-way solenoid valve.

[0106] See also Figures 6 to 8 In one embodiment, the switching device 200 further includes a second bypass pipe 270 and a second bypass valve 280, one end of the second bypass pipe 270 is connected to the first liquid pipe 18, and the other end of the second bypass pipe 270 is connected to the second liquid pipe 19, and the second bypass valve 280 is arranged in the second bypass pipe 270, and the second bypass valve 280 is used to control the on and off of the second bypass pipe 270.

[0107] It is understood that in the first operating mode or the second operating mode, the second bypass valve 280 is open, and the second bypass pipe 270 connects the first liquid pipe 18 and the second liquid pipe 19. Specifically, in the first operating mode, a portion of the refrigerant flows through the second indoor heat exchanger 320 and then flows into the second liquid pipe 19 from the fourth connection port, while another portion of the refrigerant flows through the first outdoor heat exchanger 410 and then flows into the first liquid pipe 18. Because the first indoor heat exchanger 310 stops heat exchange, the second bypass valve 280 opens, allowing the other portion of the refrigerant in the first liquid pipe 18 to flow along the second bypass pipe 270 into the second liquid pipe 19. The two portions of refrigerant converge in the second liquid pipe 19, then flow through the second outdoor heat exchanger 420 to evaporate and absorb heat before returning to the compressor 100, thereby achieving the inductive defrosting function of the heat exchange system 10. In the second operating mode, a portion of the refrigerant flows through the first outdoor heat exchanger 410 and then flows into the first liquid pipe 18, while the other portion of the refrigerant flows through the second indoor heat exchanger 320 and then flows into the second liquid pipe 19 from the fourth connection port. Because the second outdoor heat exchanger 420 stops heat exchange, the second bypass valve 280 opens, allowing the other portion of the refrigerant in the second liquid pipe 19 to flow along the second bypass pipe 270 into the first liquid pipe 18. The two portions of refrigerant converge in the first liquid pipe 18, then flow through the first indoor heat exchanger 310 to evaporate and absorb heat before returning to the compressor 100, thereby achieving the constant temperature dehumidification function of the heat exchange system 10. The connection method of the second bypass pipe 270 and the second bypass valve 280 in the heat exchange system 10 is simple, making it easy for the heat exchange system 10 to achieve the functions of non-sensitive defrosting and constant temperature dehumidification. In addition, the second bypass valve 280 can be a solenoid valve, specifically a one-way solenoid valve.

[0108] See also Figures 1 to 3The present application also proposes a heat exchange system 10, which includes a compressor 100, a switching device 200, a first heat exchange device 300, and a second heat exchange device 400. The first heat exchange device 300 includes at least one three-pipe indoor unit 301, and the three-pipe indoor unit 301 has a first indoor heat exchanger 310, a second indoor heat exchanger 320, a first interface, a second interface, and a third interface. The two ends of the first indoor heat exchanger 310 are respectively connected to the first interface and the third interface, and the two ends of the second indoor heat exchanger 320 are respectively connected to the second interface and the third interface. The three-pipe indoor unit 301 is connected to the switching device 200 through the first interface and the second interface, and the three-pipe indoor unit 301 is connected to the second heat exchange device 400 through the third interface; the second heat exchange device 400 has a first outdoor heat exchanger 410 and a second outdoor heat exchanger 420; the switching device 200 is used to control the refrigerant discharged from the compressor 100 to flow through at least two of the first indoor heat exchanger 310, the second indoor heat exchanger 320, the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 to form a third working mode and / or a fourth working mode; in the third working mode, a part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and another part of the refrigerant flows through the second outdoor heat exchanger 420 to condense and release heat and then converges together, and then is diverted to the first indoor heat exchanger 310 to evaporate and absorb heat and the second indoor heat exchanger 320 to evaporate and absorb heat and then returns to the compressor 100; in the fourth working mode, a part of the refrigerant flows through the first indoor heat exchanger 310 to condense and release heat and another part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat and then converges together, and then is diverted to the first outdoor heat exchanger 410 to evaporate and absorb heat and the second outdoor heat exchanger 420 to evaporate and absorb heat and then returns to the compressor 100.

[0109] It can be understood that the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are independent of each other in the three-pipe indoor unit 301, that is, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are two independent heat exchangers and can operate independently, so that the heat exchange system 10 has at least a third working mode and a fourth working mode, and the heat exchange system 10 has strong functionality.

[0110] In the third working mode, a part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and the other part of the refrigerant flows through the second outdoor heat exchanger 420 to condense and release heat and then gathers together. A part of the refrigerant is diverted to the first indoor heat exchanger 310 to evaporate and absorb heat to perform indoor cooling, and then returns to the compressor 100. The other part of the refrigerant is diverted to the second indoor heat exchanger 320 to evaporate and absorb heat to perform indoor cooling, and then returns to the compressor 100. In this way, during the circulation of the refrigerant, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have dual evaporation temperatures and evaporation pressures to perform indoor cooling, which is beneficial to the stepped heat exchange in the first heat exchange device 300, that is, the stepped cooling in the indoor unit is realized, and the energy efficiency of the heat exchange system 10 is improved.

[0111] In the fourth working mode, a part of the refrigerant flows through the first indoor heat exchanger 310 to condense and release heat for indoor heating, and the other part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat for indoor heating. The refrigerants after heat release are gathered together and then diverted to the first outdoor heat exchanger 410 to evaporate and absorb heat and the second outdoor heat exchanger 420 to evaporate and absorb heat and then return to the compressor 100. In this way, during the circulation of the refrigerant, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have dual condensing temperatures and condensing pressures for indoor heating, which is beneficial to the stepped heat exchange in the first heat exchange device 300, that is, the stepped heating in the indoor unit is realized, and the energy efficiency of the heat exchange system 10 is improved.

[0112] In one embodiment, the three-pipe indoor unit 301 has a first air duct, and the first indoor heat exchanger 310 is arranged upstream of the second indoor heat exchanger 320 along the air outlet direction of the first air duct; in the third working mode, the refrigerant pressure flowing into the first indoor heat exchanger 310 is greater than the refrigerant pressure flowing into the second indoor heat exchanger 320.

[0113] It can be understood that in the third working mode, the heat exchange system 10 performs indoor cooling, and the air first flows through the first indoor heat exchanger 310 in the first air duct, and then flows through the second indoor heat exchanger 320 and is blown to the outside of the three-pipe indoor unit 301. The refrigerant flowing into the first indoor heat exchanger 310 is a high-pressure refrigerant with a high evaporation pressure relative to the refrigerant flowing into the second indoor heat exchanger 320. The refrigerant flowing into the first indoor heat exchanger 310 is a medium-pressure refrigerant with a low evaporation pressure. In this way, the refrigerant pressure in the three-pipe indoor unit 301 can be set in a gradient in the third working mode, and Compared with medium-pressure refrigerant, high-pressure refrigerant is more conducive to increasing the cooling capacity. When the air flows through the first indoor heat exchanger 310 and the second indoor heat exchanger 320, the air first flows through the high-pressure refrigerant in the three-pipe indoor unit 301, and then flows through the medium-pressure refrigerant. The air cooled by the high-pressure refrigerant is blown into the room in the direction of the air cooled by the medium-pressure refrigerant, which is conducive to lowering the indoor cooling temperature. The refrigerant in the first indoor heat exchanger 310 and the second indoor heat exchanger 320 flowing into the three-pipe indoor unit 301 adopts a high and low pressure setting, and the indoor unit adopts a step-by-step heat exchange, which is conducive to reducing the pressure ratio of the compressor 100, thereby improving the energy efficiency of the heat exchange system 10.

[0114] In one embodiment, the three-pipe indoor unit 301 has a first air duct, and the first indoor heat exchanger 310 is arranged upstream of the second indoor heat exchanger 320 along the air outlet direction of the first air duct; in the fourth working mode, the refrigerant pressure flowing into the first indoor heat exchanger 310 is less than the refrigerant pressure flowing into the second indoor heat exchanger 320.

[0115] It can be understood that in the fourth working mode, the heat exchange system 10 performs indoor heating, and the air first flows through the first indoor heat exchanger 310 in the first air duct, and then flows through the second indoor heat exchanger 320 and is blown to the outside of the three-pipe indoor unit 301. The refrigerant flowing into the first indoor heat exchanger 310 is a medium-pressure refrigerant with a low condensing pressure, and the refrigerant flowing into the second indoor heat exchanger 320 is a high-pressure refrigerant with a high condensing pressure. In this way, the refrigerant pressure in the three-pipe indoor unit 301 can be set in a gradient in the fourth working mode, and High-pressure refrigerant is more conducive to increasing the heating amount than medium-pressure refrigerant. When the air flows through the first indoor heat exchanger 310 and the second indoor heat exchanger 320, the air first flows through the medium-pressure refrigerant in the three-tube indoor unit 301, and then flows through the high-pressure refrigerant. The air heated by the medium-pressure refrigerant is blown into the room in the direction of the air heated by the high-pressure refrigerant, which is conducive to increasing the indoor heating temperature. The refrigerants in the first indoor heat exchanger 310 and the second indoor heat exchanger 320 flowing into the three-tube indoor unit 301 adopt a high and low pressure setting, and the indoor units perform step-by-step heat exchange, which is conducive to reducing the pressure ratio of the compressor 100, thereby improving the energy efficiency of the heat exchange system 10.

[0116] In one embodiment, the switching device 200 includes a first reversing valve 210 and a second reversing valve 220. The heat exchange system 10 also includes a first pipeline 11, a second pipeline 12, and a third pipeline 13. One end of the first pipeline 11 is connected to the first interface, and the other end of the first pipeline 11 is connected to the compressor 100 via the first reversing valve 210. One end of the second pipeline 12 is connected to the second interface, and the other end of the second pipeline 12 is connected to the compressor 100 via the second reversing valve 220. One end of the third pipeline 13 is connected to the third interface, and the other end of the third pipeline 13 is connected to the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420. In this configuration, the first reversing valve 210 and the second reversing valve 220 can adjust the flow direction of the refrigerant in the heat exchange system 10, so that the heat exchange system 10 can achieve indoor cooling or heating.

[0117] Furthermore, the first reversing valve 210 and the second reversing valve 220 may be composed of multiple valve bodies or may be four-way reversing valves, without limitation. In this embodiment, the first reversing valve 210 comprises a four-way reversing valve, and / or the second reversing valve 220 comprises a four-way reversing valve. The provision of a four-way reversing valve allows for simple and effective switching of refrigerant flow direction, resulting in a simple structure and ease of assembly for the heat exchange system 10.

[0118] In one embodiment, the compressor 100 has a first air intake port 110, a second air intake port 120, a first exhaust port 130 and a second exhaust port 140, the first reversing valve 210 connects the first air intake port 110, the first exhaust port 130, the first pipeline 11 and the first outdoor heat exchanger 410, and the second reversing valve 220 connects the second air intake port 120, the second exhaust port 140, the second pipeline 12 and the second outdoor heat exchanger 420.

[0119] It is understood that the first air intake port 110 and the second air intake port 120 return air independently, and the air intake pressures of the first air intake port 110 and the second air intake port 120 can be the same or different; the first air discharge port 130 and the second air discharge port 140 exhaust air independently, and the air discharge pressures of the first air discharge port 130 and the second air discharge port 140 can be the same or different, so that the refrigerant pressure flowing into the three-pipe indoor unit 301 or the second heat exchange device 400 can be the same or different, thereby meeting the needs of different operating modes. In this embodiment, the compressor 100 is a double-suction double-row compressor 100, specifically a double-cylinder double-suction double-row compressor 100. The two compression cylinders operate simultaneously, which increases the air intake and exhaust volume of the compressor 100, thereby improving the compression capacity of the compressor 100. In combination with the three-pipe indoor unit 301, it is beneficial to improve the energy efficiency of the heat exchange system 10 during cooling or heating.

[0120] In one embodiment, the compressor 100 has a first exhaust port 130 and a second exhaust port 140. In a third operating mode, the exhaust pressure of the first exhaust port 130 is greater than the exhaust pressure of the second exhaust port 140. With this arrangement, in the third operating mode, the first exhaust port 130 and the second exhaust port 140 of the compressor 100 discharge refrigerants of different pressures, with the first exhaust port 130 discharging high-pressure refrigerant and the second exhaust port 140 discharging medium-pressure refrigerant. This facilitates achieving a higher pressure of the refrigerant flowing into the first indoor heat exchanger 310 than that flowing into the second indoor heat exchanger 320 without requiring an additional pressure regulating device. This facilitates simplifying the structure of the heat exchange system 10 and ensures that, in the third operating mode, the refrigerant in the first heat exchange device 300 can adopt a high-low pressure design, thereby reducing the pressure ratio of the compressor 100 and improving the energy efficiency of the heat exchange system 10.

[0121] In one embodiment, the compressor 100 has a first exhaust port 130 and a second exhaust port 140. In a fourth operating mode, the exhaust pressure of the first exhaust port 130 is lower than the exhaust pressure of the second exhaust port 140. With this arrangement, in the fourth operating mode, the first exhaust port 130 and the second exhaust port 140 of the compressor 100 discharge refrigerants of different pressures, with the first exhaust port 130 discharging medium-pressure refrigerant and the second exhaust port 140 discharging high-pressure refrigerant. This facilitates achieving a lower pressure of the refrigerant flowing into the first indoor heat exchanger 310 than that flowing into the second indoor heat exchanger 320 without requiring an additional pressure regulating device. This facilitates simplifying the structure of the heat exchange system 10 and ensures that, in the fourth operating mode, the refrigerant in the first heat exchange device 300 can adopt a high-low pressure design, thereby reducing the pressure ratio of the compressor 100 and improving the energy efficiency of the heat exchange system 10.

[0122] The present utility model also proposes an air conditioner, which includes the heat exchange system as described above. The specific structure of the heat exchange system refers to the above embodiments. Since this air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0123] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat exchange system, characterized in that: The heat exchange system includes a compressor, a switching device, a first heat exchange device, and a second heat exchange device; the first heat exchange device has a first indoor heat exchanger and a second indoor heat exchanger; the second heat exchange device has a first outdoor heat exchanger and a second outdoor heat exchanger; the compressor is connected to the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger, and the second outdoor heat exchanger via the switching device, and the switching device is used to control the compressor to be connected to at least two of the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger, and the second outdoor heat exchanger to form a heat exchange circulation loop, so as to form a first working mode and / or a second working mode; In the first working mode, the first indoor heat exchanger stops exchanging heat, a portion of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and another portion of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, then flows through the second outdoor heat exchanger to evaporate and absorb heat before returning to the compressor; In the second working mode, the second outdoor heat exchanger stops heat exchange, a part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and the other part of the refrigerant flows through the second indoor heat exchanger to condense and release heat and then gathers together, then flows through the first indoor heat exchanger to evaporate and absorb heat and then returns to the compressor.

2. The heat exchange system according to claim 1, wherein: The first heat exchange device includes at least one indoor unit, and the first indoor heat exchanger and the second indoor heat exchanger are arranged in the same indoor unit and are independent of each other.

3. The heat exchange system according to claim 2, characterized in that: The indoor unit is a three-pipe indoor unit and has a first interface, a second interface and a third interface. The two ends of the first indoor heat exchanger are respectively connected to the first interface and the third interface, and the two ends of the second indoor heat exchanger are respectively connected to the second interface and the third interface. The three-pipe indoor unit is connected to the switching device through the first interface and the second interface, and the three-pipe indoor unit is connected to the second heat exchange device through the third interface.

4. The heat exchange system according to claim 3, characterized in that: The switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first pipeline, a second pipeline and a third pipeline. One end of the first pipeline is connected to the first interface, and the other end of the first pipeline is connected to the compressor through the first reversing valve. One end of the second pipeline is connected to the second interface, and the other end of the second pipeline is connected to the compressor through the second reversing valve. One end of the third pipeline is connected to the third interface, and the other end of the third pipeline is connected to the first outdoor heat exchanger and the second outdoor heat exchanger.

5. The heat exchange system according to claim 4, characterized in that: The compressor has a first intake port, a second intake port, a first exhaust port, and a second exhaust port. The first reversing valve connects the first intake port, the first exhaust port, the first pipeline, and the first outdoor heat exchanger. The second reversing valve connects the second intake port, the second exhaust port, the second pipeline, and the second outdoor heat exchanger.

6. The heat exchange system according to claim 5, characterized in that: The switching device further includes a first bypass pipe and a first bypass valve, the first reversing valve is connected to the first air intake port via a first connecting pipe, the second reversing valve is connected to the second air intake port via a second connecting pipe, one end of the first bypass pipe is connected to the first connecting pipe, and the other end of the first bypass pipe is connected to the second connecting pipe, the first bypass valve is provided in the first bypass pipe, and the first bypass valve is used to control the opening and closing of the first bypass pipe; In the first operating mode or the second operating mode, the first bypass valve is opened, and the first bypass pipe is connected to the first connecting pipe and the second connecting pipe.

7. The heat exchange system according to claim 3, characterized in that: The first heat exchange device also includes a first indoor throttling device and a second indoor throttling device. The first indoor throttling device is arranged on the pipeline connecting the first indoor heat exchanger and the third interface; the second indoor throttling device is arranged on the pipeline connecting the second indoor heat exchanger and the third interface.

8. The heat exchange system according to claim 4, wherein: The switching device also includes a first outdoor throttling device and a second outdoor throttling device. The first outdoor throttling device is arranged on the pipeline connecting the first outdoor heat exchanger and the third pipeline; the second outdoor throttling device is arranged on the pipeline connecting the second outdoor heat exchanger and the third pipeline.

9. The heat exchange system according to any one of claims 1 to 8, characterized in that: The heat exchange system also has a third working mode and / or a fourth working mode. In the third working mode, part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and the other part of the refrigerant flows through the second outdoor heat exchanger to condense and release heat, and then is combined together, and then divided into the first indoor heat exchanger to evaporate and absorb heat, and the second indoor heat exchanger to evaporate and absorb heat, and then returns to the compressor; In the fourth working mode, a portion of the refrigerant flows through the first indoor heat exchanger to condense and release heat, and the other portion of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and then converges together, and then is divided into the first outdoor heat exchanger to evaporate and absorb heat and the second outdoor heat exchanger to evaporate and absorb heat, and then returns to the compressor.

10. The heat exchange system according to claim 9, characterized in that: The first heat exchange device has a first air duct, and the first indoor heat exchanger is arranged upstream of the second indoor heat exchanger along the air outlet direction of the first air duct; in the third operating mode, the pressure of the refrigerant flowing into the first indoor heat exchanger is greater than the pressure of the refrigerant flowing into the second indoor heat exchanger; And / or, in the fourth operating mode, the pressure of the refrigerant flowing into the first indoor heat exchanger is lower than the pressure of the refrigerant flowing into the second indoor heat exchanger.

11. The heat exchange system according to claim 2, wherein: The indoor unit is a four-pipe indoor unit and has a first connection port, a second connection port, a third connection port and a fourth connection port. The two ends of the first indoor heat exchanger are respectively connected to the first connection port and the second connection port, and the two ends of the second indoor heat exchanger are respectively connected to the third connection port and the fourth connection port. The four-pipe indoor unit is connected to the switching device through the first connection port and the third connection port, and the four-pipe indoor unit is connected to the second heat exchange device through the second connection port and the fourth connection port.

12. The heat exchange system according to claim 11, wherein: The switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first air pipe, a second air pipe, a first liquid pipe and a second liquid pipe. One end of the first air pipe is connected to the first connecting port, and the other end of the first air pipe is connected to the compressor through the first reversing valve. The second connecting port is connected to the first outdoor heat exchanger through the first liquid pipe. One end of the second air pipe is connected to the third connecting port, and the other end of the second air pipe is connected to the compressor through the second reversing valve. The fourth connecting port is connected to the second outdoor heat exchanger through the second liquid pipe.

13. The heat exchange system according to claim 12, wherein: The compressor has a first intake port, a second intake port, a first exhaust port, and a second exhaust port. The first reversing valve connects the first intake port, the first exhaust port, the first air pipe, and the first outdoor heat exchanger. The second reversing valve connects the second intake port, the second exhaust port, the second air pipe, and the second outdoor heat exchanger.

14. The heat exchange system according to claim 13, wherein: The switching device also includes a first bypass pipe and a first bypass valve. The first reversing valve is connected to the first air intake port through a first connecting pipe, and the second reversing valve is connected to the second air intake port through a second connecting pipe. One end of the first bypass pipe is connected to the first connecting pipe, and the other end of the first bypass pipe is connected to the second connecting pipe. The first bypass valve is arranged in the first bypass pipe, and the first bypass valve is used to control the opening and closing of the first bypass pipe.

15. The heat exchange system according to claim 12, wherein: The switching device also includes a second bypass pipe and a second bypass valve, one end of the second bypass pipe is connected to the first liquid pipe, and the other end of the second bypass pipe is connected to the second liquid pipe. The second bypass valve is arranged in the second bypass pipe, and the second bypass valve is used to control the opening and closing of the second bypass pipe.

16. A heat exchange system, characterized in that: The heat exchange system includes a compressor, a switching device, a first heat exchange device, and a second heat exchange device. The first heat exchange device includes at least one three-pipe indoor unit, the three-pipe indoor unit having a first indoor heat exchanger, a second indoor heat exchanger, a first interface, a second interface, and a third interface. The first indoor heat exchanger is connected at both ends to the first interface and the third interface, respectively. The second indoor heat exchanger is connected at both ends to the second interface and the third interface, respectively. The three-pipe indoor unit is connected to the switching device via the first interface and the second interface, and is connected to the second heat exchange device via the third interface. The second heat exchange device has a first outdoor heat exchanger and a second outdoor heat exchanger. The switching device is used to control the refrigerant discharged from the compressor to flow through at least two of the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger, and the second outdoor heat exchanger to form a third operating mode and / or a fourth operating mode; In the third working mode, part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and the other part of the refrigerant flows through the second outdoor heat exchanger to condense and release heat, and then is combined together, and then divided into the first indoor heat exchanger to evaporate and absorb heat, and the second indoor heat exchanger to evaporate and absorb heat, and then returns to the compressor; In the fourth working mode, a portion of the refrigerant flows through the first indoor heat exchanger to condense and release heat, and the other portion of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and then converges together, and then is divided into the first outdoor heat exchanger to evaporate and absorb heat and the second outdoor heat exchanger to evaporate and absorb heat, and then returns to the compressor.

17. The heat exchange system according to claim 16, wherein: The three-pipe indoor unit has a first air duct, and the first indoor heat exchanger is arranged upstream of the second indoor heat exchanger along the air outlet direction of the first air duct; in the third operating mode, the refrigerant pressure flowing into the first indoor heat exchanger is greater than the refrigerant pressure flowing into the second indoor heat exchanger; And / or, in the fourth operating mode, the pressure of the refrigerant flowing into the first indoor heat exchanger is lower than the pressure of the refrigerant flowing into the second indoor heat exchanger.

18. The heat exchange system according to claim 16, wherein: The switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first pipeline, a second pipeline and a third pipeline. One end of the first pipeline is connected to the first interface, and the other end of the first pipeline is connected to the compressor through the first reversing valve. One end of the second pipeline is connected to the second interface, and the other end of the second pipeline is connected to the compressor through the second reversing valve. One end of the third pipeline is connected to the third interface, and the other end of the third pipeline is connected to the first outdoor heat exchanger and the second outdoor heat exchanger.

19. The heat exchange system according to claim 18, wherein: The compressor has a first intake port, a second intake port, a first exhaust port, and a second exhaust port. The first reversing valve connects the first intake port, the first exhaust port, the first pipeline, and the first outdoor heat exchanger. The second reversing valve connects the second intake port, the second exhaust port, the second pipeline, and the second outdoor heat exchanger.

20. An air conditioner, characterized in that: Comprising the heat exchange system according to any one of claims 1 to 19.

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