Heat exchange system and air conditioner

Abstract

Disclosed in the present application are 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 a first indoor heat exchanger, a second indoor heat exchanger, a first outdoor heat exchanger and a 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. In the first operating mode, the first indoor heat exchanger stops heat exchange, one portion of refrigerant flows through the second indoor heat exchanger for condensation and heat release, and the other portion of the refrigerant flows through the first outdoor heat exchanger for condensation and heat release, and the two portions then converge, flow through the second outdoor heat exchanger for evaporation and heat absorption, and then return to the compressor.

Description

Heat exchange system and air conditioner

[0001] Related applications

[0002] This application claims priority to Chinese Patent Application No. 202411389358.8 and No. 202422409665.X, filed on September 30, 2024, the contents of both of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of heat exchange, in particular to a heat exchange system and an air conditioner. BACKGROUND

[0004] The existing heat exchange system, such as an air conditioning system, generally has one evaporator and one condenser, which makes the functions that the existing heat exchange system can realize relatively single. In order to increase the functions, an additional set of equipment corresponding to the functions is usually needed, which results in low energy efficiency and poor applicability of the existing heat exchange system. SUMMARY

[0005] The main purpose of the present application is to provide a heat exchange system that can realize multiple functions and has high energy efficiency.

[0006] To achieve the above purpose, the heat exchange system provided by the present application comprises a compressor, a switching device, a first heat exchange device and a second heat exchange device.

[0007] The first heat exchange device has a first indoor heat exchanger and a second indoor heat exchanger.

[0008] The second heat exchange device has a first outdoor heat exchanger and a second outdoor heat exchanger.

[0009] 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 through 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 working mode and / or a second working mode.

[0010] 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 another part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and then converges together, and then flows through the second outdoor heat exchanger to evaporate and absorb heat, and then returns to the compressor.

[0011] In the second working mode, the second outdoor heat exchanger stops heat exchange, a part of refrigerant flows through the first outdoor heat exchanger to condense and release heat, and another part of refrigerant flows through the second indoor heat exchanger to condense and release heat, and then converges together, and then flows through the first indoor heat exchanger to evaporate and absorb heat, and then returns to the compressor.

[0012] In an embodiment, the first heat exchange device comprises 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.

[0013] In an embodiment, the indoor unit is a three-tube indoor unit, and has a first interface, a second interface and a third interface, two ends of the first indoor heat exchanger are connected to the first interface and the third interface respectively, two ends of the second indoor heat exchanger are connected to the second interface and the third interface respectively, the three-tube indoor unit is connected to the switching device through the first interface and the second interface, and the three-tube indoor unit is connected to the second heat exchange device through the third interface.

[0014] In an embodiment, the switching device comprises a first reversing valve and a second reversing valve, and the heat exchange system further comprises a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline is connected to the first interface, 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, 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.

[0015] In an embodiment, the compressor has a first suction port, a second suction port, a first discharge port and a second discharge port, the first reversing valve is connected to the first suction port, the first discharge port, the first pipeline and the first outdoor heat exchanger, and the second reversing valve is connected to the second suction port, the second discharge port, the second pipeline and the second outdoor heat exchanger.

[0016] In an embodiment, the switching device further comprises a first bypass pipeline and a first bypass valve, the first reversing valve is connected to the first suction port through a first connecting pipeline, the second reversing valve is connected to the second suction port through a second connecting pipeline, one end of the first bypass pipeline is connected to the first connecting pipeline, the other end of the first bypass pipeline is connected to the second connecting pipeline, and the first bypass valve is arranged in the first bypass pipeline and is used to control the opening and closing of the first bypass pipeline.

[0017] In the first working mode or the second working mode, the first bypass valve is opened, and the first bypass pipe connects the first connecting pipe and the second connecting pipe.

[0018] In an embodiment, the first heat exchange device further comprises a first indoor throttling element and a second indoor throttling element, the first indoor throttling element is arranged on a pipe through which the first indoor heat exchanger communicates with the third interface, and the second indoor throttling element is arranged on a pipe through which the second indoor heat exchanger communicates with the third interface.

[0019] In an embodiment, the switching device further comprises a first outdoor throttling element and a second outdoor throttling element, the first outdoor throttling element is arranged on a pipe through which the first outdoor heat exchanger communicates with the third pipe, and the second outdoor throttling element is arranged on a pipe through which the second outdoor heat exchanger communicates with the third pipe.

[0020] In an embodiment, the heat exchange system further has a third working mode and / or a fourth working mode,

[0021] In the third working mode, a part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, and another part of the refrigerant flows through the second outdoor heat exchanger to condense and release heat, and then converges together, and is divided into two parts to flow through the first indoor heat exchanger and the second indoor heat exchanger to evaporate and absorb heat, and then returns to the compressor;

[0022] In the fourth working mode, a part of the refrigerant flows through the first indoor heat exchanger to condense and release heat, and another part of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and then converges together, and is divided into two parts to flow through the first outdoor heat exchanger and the second outdoor heat exchanger to evaporate and absorb heat, and then returns to the compressor.

[0023] In an embodiment, the first heat exchange device has a first air duct, the first indoor heat exchanger is arranged upstream of the second indoor heat exchanger along the air outflow direction of the first air duct; in the third working mode, the refrigerant pressure flowing into the first indoor heat exchanger is greater than the refrigerant pressure flowing into the second indoor heat exchanger;

[0024] and / or, in the fourth working mode, the refrigerant pressure flowing into the first indoor heat exchanger is less than the refrigerant pressure flowing into the second indoor heat exchanger.

[0025] In an embodiment, the indoor unit is a four-way indoor unit, and has a first connecting port, a second connecting port, a third connecting port and a fourth connecting port, two ends of the first indoor heat exchanger are connected to the first connecting port and the second connecting port respectively, two ends of the second indoor heat exchanger are connected to the third connecting port and the fourth connecting port respectively, the four-way indoor unit is connected to the switching device through the first connecting port and the third connecting port, and the four-way indoor unit is connected to the second heat exchange device through the second connecting port and the fourth connecting port.

[0026] In an embodiment, the switching device comprises the first reversing valve and the second reversing valve, and the heat exchange system further comprises a first gas pipe, a second gas pipe, a first liquid pipe and a second liquid pipe, one end of the first gas pipe is connected to the first connecting port, the other end of the first gas 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 gas pipe is connected to the third connecting port, the other end of the second gas 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.

[0027] In an embodiment, the compressor has a first suction port, a second suction port, a first discharge port and a second discharge port, the first reversing valve is connected to the first suction port, the first discharge port, the first gas pipe and the first outdoor heat exchanger, and the second reversing valve is connected to the second suction port, the second discharge port, the second gas pipe and the second outdoor heat exchanger.

[0028] In an embodiment, the switching device further comprises a first bypass pipe and a first bypass valve, the first reversing valve is connected to the first suction port through a first connecting pipe, the second reversing valve is connected to the second suction port through a second connecting pipe, one end of the first bypass pipe is connected to the first connecting pipe, the other end of the first bypass pipe is connected to the second connecting pipe, and the first bypass valve is arranged in the first bypass pipe and used for controlling the opening and closing of the first bypass pipe.

[0029] In an embodiment, the switching device further comprises 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 used for controlling the opening and closing of the second bypass pipe.

[0030] The application also provides a heat exchange system, which comprises 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 has a first indoor heat exchanger, a second indoor heat exchanger, a first interface, a second interface and a third interface, two ends of the first indoor heat exchanger are communicated with the first interface and the third interface respectively, two ends of the second indoor heat exchanger are communicated with the second interface and the third interface respectively, the three-pipe indoor unit is connected with the switching device through the first interface and the second interface, and the three-pipe indoor unit is connected with the second heat exchange device through the third interface;

[0031] The second heat exchange device has a first outdoor heat exchanger and a second outdoor heat exchanger;

[0032] The switching device is used for controlling the refrigerant discharged by 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, so as to form a third working mode and / or a fourth working mode;

[0033] In the third working mode, a part of the refrigerant flows through the first outdoor heat exchanger to condense and release heat, another part of the refrigerant flows through the second outdoor heat exchanger to condense and release heat, and then the two parts of the refrigerant are gathered together, and then are divided into two parts to flow through the first indoor heat exchanger and the second indoor heat exchanger to evaporate and absorb heat, and then return to the compressor;

[0034] In the fourth working mode, a part of the refrigerant flows through the first indoor heat exchanger to condense and release heat, another part of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and then the two parts of the refrigerant are gathered together, and then are divided into two parts to flow through the first outdoor heat exchanger and the second outdoor heat exchanger to evaporate and absorb heat, and then return to the compressor.

[0035] In an embodiment, the three-pipe indoor unit has a first air duct, 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 working mode, the refrigerant flowing into the first indoor heat exchanger has a pressure greater than that of the refrigerant flowing into the second indoor heat exchanger;

[0036] And / or, in the fourth working mode, the refrigerant flowing into the first indoor heat exchanger has a pressure less than that of the refrigerant flowing into the second indoor heat exchanger.

[0037] In an embodiment, the switching device comprises a first reversing valve and a second reversing valve, and the heat exchange system further comprises a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline is connected with the first interface, the other end of the first pipeline is connected with the compressor through the first reversing valve, one end of the second pipeline is connected with the second interface, the other end of the second pipeline is connected with the compressor through the second reversing valve, one end of the third pipeline is connected with the third interface, and the other end of the third pipeline is connected with the first outdoor heat exchanger and the second outdoor heat exchanger.

[0038] In an embodiment, the compressor has a first suction port, a second suction port, a first discharge port and a second discharge port, the first reversing valve is connected with the first suction port, the first discharge port, the first pipeline and the first outdoor heat exchanger, and the second reversing valve is connected with the second suction port, the second discharge port, the second pipeline and the second outdoor heat exchanger.

[0039] The application further provides an air conditioner comprising the heat exchange system.

[0040] 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 as 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 refrigerant flows through the second indoor heat exchanger to condense and release heat, so as to perform indoor heating, another part of refrigerant flows through the first outdoor heat exchanger to condense and release heat, so as to perform 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 no-sensing defrosting, and the first indoor heat exchanger stops heat exchange, so that the defrosting does not need to absorb heat from the indoor, and the heat exchange system has high energy efficiency.

[0041] 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, another part of the refrigerant flows through the second indoor heat exchanger to condense and release heat, indoor heating is performed, the refrigerant after heat release is gathered together, and then flows through the first indoor heat exchanger to evaporate and absorb heat, so that the water vapor in the indoor air is liquefied into water after cooling, indoor dehumidification is performed, and finally returns to the compressor. In the circulation process of the refrigerant, the heat released by the refrigerant flowing through the second indoor heat exchanger is used to heat the cooled air, so that the effect of dehumidification without temperature drop is achieved. 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 recycling the heat of part of the refrigerant flowing through the first indoor heat exchanger, so that the energy efficiency of the heat exchange system is high.

[0042] Therefore, it can be seen that the heat exchange system of the present application simultaneously realizes the functions of indoor heating and outdoor defrosting in the first working mode, and the energy efficiency of the heat exchange system is high. In the second working mode, the heat exchange system simultaneously realizes the functions of indoor heating and indoor dehumidification, and the energy efficiency of the heat exchange system is high. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0044] Fig. 1 is a structural schematic diagram of a first embodiment of the heat exchange system provided by the present application;

[0045] Fig. 2 is a structural schematic diagram of the heat exchange system in Fig. 1 in the first working mode;

[0046] Fig. 3 is a structural schematic diagram of the heat exchange system in Fig. 1 in the second working mode;

[0047] Fig. 4 is a structural schematic diagram of the heat exchange system in Fig. 1 in the third working mode;

[0048] Fig. 5 is a structural schematic diagram of the heat exchange system in Fig. 1 in the fourth working mode;

[0049] Fig. 6 is a structural schematic diagram of a second embodiment of the heat exchange system provided by the present application;

[0050] Fig. 7 is a structural schematic diagram of the heat exchange system in Fig. 6 in the first working mode;

[0051] Fig. 8 is a structural schematic diagram of the heat exchange system in Fig. 6 in a second working mode.

[0052] BRIEF DESCRIPTION OF DRAWINGS 10, heat exchange system; 100, compressor; 110, first suction port; 120, second suction port; 130, first discharge port; 140, second discharge port; 200, switching device; 210, first reversing valve; 220, second reversing valve; 230, first bypass pipe; 240, first bypass valve; 250, first outdoor throttling element; 260, second outdoor throttling element; 270, second bypass pipe; 280, second bypass valve; 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; 400, second heat exchange device; 410, first outdoor heat exchanger; 420, second outdoor heat exchanger; 11, first pipeline; 12, second pipeline; 13, third pipeline; 14, first connecting pipe; 15, second connecting pipe; 16, first gas pipe; 17, second gas pipe; 18, first liquid pipe; 19, second liquid pipe.

[0053] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0055] It should be noted that if the present application involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0056] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes include "A and / or B", which includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0057] The existing heat exchange system, such as air conditioning system, generally has one evaporator and one condenser, which makes the function of the existing heat exchange system relatively single. In order to increase the function, an additional set of corresponding functional equipment is usually needed, which leads to low energy efficiency and poor applicability of the existing heat exchange system.

[0058] In order to solve the above problems, the present application provides a heat exchange system and an air conditioner comprising the heat exchange system, which can realize multiple functions and has high energy efficiency.

[0059] Please refer to FIG. 1, in the embodiment of the heat exchange system 10 of the present application, the heat exchange system 10 comprises 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 has a first indoor heat exchanger 310 and a second indoor heat exchanger 320; the second heat exchange device 400 has a first outdoor heat exchanger 410 and a second outdoor heat exchanger 420;

[0060] The compressor 100 is 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, the switching device 200 is used for controlling 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, so as to form the first working mode and / or the second working mode; in the first working mode (as shown in Figure 2), 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 another part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and then converges together, and then flows through the second outdoor heat exchanger 420 to evaporate and absorb heat, and then returns to the compressor 100; in the second working mode (as shown in Figure 3), 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 another part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat, and then converges together, and then flows through the first indoor heat exchanger 310 to evaporate and absorb heat, and then returns to the compressor 100.

[0061] It can be understood that the heat exchanger, for example, 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, and the specific number and shape of the heat exchange channels are not limited, for example, can be tubular, sheet-shaped, and of course can be other shapes. The switching device 200 is used for controlling the refrigerant discharged by 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 compressor device communicates with 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 compressor device communicates 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 through the switching device 200 to form a heat exchange circulation loop; of course, the compressor device can also communicate 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 sequence of the refrigerant flowing through the heat exchanger is not limited, and only needs to be able to form a heat exchange circulation loop.

[0062] Please refer to FIG. 2, in the first working mode, the first indoor heat exchanger 310 stops heat exchange, which means that the refrigerant in the first indoor heat exchanger 310 does not flow, or the first indoor heat exchanger 310 runs at very low power, wherein the refrigerant in the first indoor heat exchanger 310 does not flow, so that the first indoor heat exchanger 310 completely stops heat exchange; the first indoor heat exchanger 310 runs at 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 running power of the first indoor heat exchanger 310 to the rated power is not greater than 0.2, and the specific ratio can be 0.05, or 0.1, or 0.15, or 0.2, etc. In the first working mode, the first indoor heat exchanger 310 stops heat exchange, which is beneficial to shorten the flow path of the refrigerant in the circulating loop and reduce the power consumption of the heat exchange system 10, that is, it is beneficial to improve the energy efficiency of the heat exchange system 10.

[0063] Please refer to FIG. 3, in the second working mode, the second outdoor heat exchanger 420 stops heat exchange, which means that the refrigerant in the second outdoor heat exchanger 420 does not flow, or the second outdoor heat exchanger 420 runs at very low power, wherein the refrigerant in the second outdoor heat exchanger 420 does not flow, so that the second outdoor heat exchanger 420 completely stops heat exchange; the second outdoor heat exchanger 420 runs at 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 running power of the second outdoor heat exchanger 420 to the rated power is not greater than 0.2, and the specific ratio can be 0.05, or 0.1, or 0.15, or 0.2, etc. In the second working mode, the second outdoor heat exchanger 420 stops heat exchange, which is beneficial to shorten the flow path of the refrigerant in the circulating loop and reduce the power consumption of the heat exchange system 10, that is, it is beneficial to improve the energy efficiency of the heat exchange system 10.

[0064] It should be noted that the arrows in the drawings of the specification represent the direction of refrigerant flow.

[0065] The heat exchange system 10 of the present application comprises 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, so as to form a first working mode and / or a second working mode; in the first working mode, 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, to perform indoor heating, another part of the refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, to perform 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, so that in the flow process 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 non-sensing defrosting, and the first indoor heat exchanger 310 stops heat exchange, so that the defrosting does not need to absorb heat from the indoor, and the heat exchange system 10 has high energy efficiency.

[0066] 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, another part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat, to perform indoor heating, the refrigerant after heat release is gathered together, 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 liquefied into water after cooling, to perform indoor dehumidification, and finally returns to the compressor 100, so that in the circulation process of the refrigerant, the heat released by the refrigerant flowing through the second indoor heat exchanger 320 heats the air after cooling, to achieve 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 heats the air, which is equivalent to recycling 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.

[0067] Therefore, the heat exchange system 10 of the present application simultaneously realizes the functions of indoor heating and outdoor defrosting in the first working mode, and has high energy efficiency; simultaneously realizes the functions of indoor heating and indoor dehumidification in the second working mode, and has high energy efficiency.

[0068] In an embodiment, the first heat exchange device 300 comprises at least one indoor unit, and the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are arranged in the same indoor unit and are independent of each other. In this way, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are two independent heat exchangers arranged in the same housing of the indoor unit, that is, the indoor unit comprises a first housing, and the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are arranged in the first housing and can work independently, so that the heat exchange system 10 has at least a first working mode and a second working mode, and the heat exchange system 10 has strong functionality.

[0069] In an embodiment, the indoor unit is a three-way indoor unit 301, and has a first interface, a second interface and a third interface, two ends of the first indoor heat exchanger 310 are respectively connected to the first interface and the third interface, and two ends of the second indoor heat exchanger 320 are respectively connected to the second interface and the third interface. The three-way indoor unit 301 is connected to the switching device 200 through the first interface and the second interface, and is connected to the second heat exchange device 400 through the third interface.

[0070] It can be understood that the indoor unit is a three-way 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 indoor heat exchanger 310 and the first interface, which is beneficial to shorten the flow path of the refrigerant in the three-way indoor unit 301, reduce the power consumption of the heat exchange system 10, and thus improve the energy efficiency of the heat exchange system 10.

[0071] The indoor unit is a three-way 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, performs indoor heating, 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 liquefied into water, and indoor dehumidification is performed. In the three-way 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, which 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-way indoor unit 301 can recover heat in the second working mode, which improves the energy efficiency of the heat exchange system 10.

[0072] Please refer to FIG. 3, in an embodiment, the switching device 200 comprises a first reversing valve 210 and a second reversing valve 220, and the heat exchange system 10 further comprises a first pipeline 11, a second pipeline 12 and a third pipeline 13, one end of the first pipeline 11 is connected with the first interface, the other end of the first pipeline 11 is connected with the compressor 100 through the first reversing valve 210, one end of the second pipeline 12 is connected with the second interface, the other end of the second pipeline 12 is connected with the compressor 100 through the second reversing valve 220, one end of the third pipeline 13 is connected with the third interface, the other end of the third pipeline 13 is connected with the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420.

[0073] It can be understood that the three-pipe indoor unit 301 is connected with the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 through the third pipeline 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 pipeline 13, and the third pipeline 13 divides the refrigerant into two parts to flow into the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420, so that the structure of the first heat exchange device 300 connecting the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420 is simple, which is beneficial to reducing the number of pipelines, thereby optimizing the pipeline arrangement of the heat exchange system 10.

[0074] In the second working mode, part of the refrigerant flows into the third pipeline 13 after flowing through the first outdoor heat exchanger 410, and the other part of the refrigerant flows to the third interface after flowing through the second indoor heat exchanger 320, the third pipeline 13 is connected with the third interface, so that 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.

[0075] In an embodiment, the first reversing valve 210 and the second reversing valve 220 can be composed of multiple valve bodies, or can be four-way reversing valves, which are not limited in particular in this embodiment. In this scheme, the first reversing valve 210 comprises a four-way reversing valve; and / or, the second reversing valve 220 comprises a four-way reversing valve, and the four-way reversing valve is provided to simply and effectively switch the flow direction of the refrigerant, so that the structure of the heat exchange system 10 is simple and easy to assemble.

[0076] In an embodiment, the compressor 100 has a first suction port 110, a second suction port 120, a first discharge port 130 and a second discharge port 140, the first reversing valve 210 is connected with the first suction port 110, the first discharge port 130, the first pipeline 11 and the first outdoor heat exchanger 410, and the second reversing valve 220 is connected with the second suction port 120, the second discharge port 140, the second pipeline 12 and the second outdoor heat exchanger 420.

[0077] It can be understood that the first suction port 110 and the second suction port 120 are independently back gas, the suction pressures of the first suction port 110 and the second suction port 120 can be the same or different; the first exhaust port 130 and the second exhaust port 140 are independently exhaust, the exhaust pressures of the first exhaust port 130 and the second exhaust port 140 can be the same or different, so that the pressures of the refrigerant 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 the present scheme, the compressor 100 is a double-suction double-exhaust compressor 100, and specifically can be a double-cylinder double-suction double-exhaust compressor 100, which utilizes two compression cylinders to work simultaneously, thereby increasing the suction volume and the exhaust volume of the compressor 100, and thus improving the compression capacity of the compressor 100, which is conducive to improving the energy efficiency of the heat exchange system 10.

[0078] 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 in communication with the first outdoor heat exchanger 410, and the second exhaust port 140 is in communication with 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, and such high-low pressure design can reduce the pressure ratio of the compressor 100, so that the energy efficiency of the compressor 100 is high.

[0079] Please refer to FIGS. 1 to 3, in an embodiment, the switching device 200 further comprises a first bypass pipe 230 and a first bypass valve 240, the first switching valve 210 is connected with the first suction port 110 through a first connecting pipe 14, the second switching valve 220 is connected with the second suction port 120 through a second connecting pipe 15, one end of the first bypass pipe 230 is connected with the first connecting pipe 14, the other end of the first bypass pipe 230 is connected with 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 for controlling the opening and closing 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.

[0080] It can be understood that, in the first working mode, part of the refrigerant flowing out of the second connecting pipe 15 flows back to the compressor 100 through the second suction port 120, and by setting the first bypass pipe 230 and the first bypass valve 240, the first bypass valve 240 is opened, so that another part of the refrigerant in the second connecting pipe 15 can be branched along the first bypass pipe 230 to the first connecting pipe 14 and flow back to the compressor 100 through the first suction port 110, to realize the functions of double suction and double discharge of the compressor 100 and the no-supercooling of the heat exchange system 10. In the second working mode, part of the refrigerant flowing out of the first connecting pipe 14 flows back to the compressor 100 through the first suction port 110, and by setting the first bypass pipe 230 and the first bypass valve 240, the first bypass valve 240 is opened, so that another part of the refrigerant in the first connecting pipe 14 can be branched along the first bypass pipe 230 to the second connecting pipe 15 and flow back to the compressor 100 through the second suction port 120, to realize the functions of double suction and double discharge of the compressor 100 and the constant temperature dehumidification of the heat exchange system 10. The connection mode of the first bypass pipe 230 and the first bypass valve 240 in the heat exchange system 10 is simple, so that the heat exchange system 10 is easy to realize the functions of no-supercooling and constant temperature dehumidification. In addition, the first bypass valve 240 can be an electromagnetic valve, specifically a single-pass electromagnetic valve.

[0081] Referring to FIG. 1, in an embodiment, the first heat exchange device 300 further comprises a first indoor throttling member 330 and a second indoor throttling member 340, the first indoor throttling member 330 is arranged on a pipeline through which the first indoor heat exchanger 310 communicates with the third interface; and the second indoor throttling member 340 is arranged on a pipeline through which the second indoor heat exchanger 320 communicates with the third interface.

[0082] It can be understood that the first indoor throttling member 330 is used to throttle the first indoor heat exchanger 310 to control the flow speed and flow rate of the refrigerant. When the first indoor heat exchanger 310 performs refrigeration, the first indoor throttling member 330 functions to throttle and reduce pressure; when the first indoor heat exchanger 310 performs heating, the first indoor throttling member 330 functions to adjust the supercooling degree. For example, when the first indoor throttling member 330 is closed, the pipeline where the first indoor throttling member 330 is arranged is not conductive, and the first indoor heat exchanger 310 does not perform heat exchange work. Similarly, the second indoor throttling member 340 is used to throttle the second indoor heat exchanger 320, and the working principle of the second indoor throttling member 340 is similar to that of the first indoor throttling member 330, which will not be described here. In addition, the first indoor throttling member 330 and the second indoor throttling member 340 can both be electronic expansion valves.

[0083] In an embodiment, the switching device 200 further comprises a first outdoor throttling element 250 and a second outdoor throttling element 260, the first outdoor throttling element 250 is arranged on a pipeline through which the first outdoor heat exchanger 410 communicates with the third pipeline 13; the second outdoor throttling element 260 is arranged on a pipeline through which the second outdoor heat exchanger 420 communicates with the third pipeline 13.

[0084] It can be understood that the first outdoor throttling element 250 is used to throttle the first outdoor heat exchanger 410, and the second outdoor throttling element 260 is used to throttle the second outdoor heat exchanger 420, so as to control the flow speed and flow rate of the refrigerant, so that the heat exchange system 10 can have multiple working modes. The first outdoor throttling element 250 and the second outdoor throttling element 260 can both be electronic expansion valves.

[0085] In an embodiment, the first heat exchange device 300 comprises at least one indoor unit, and the indoor unit is a three-pipe indoor unit 301. The first indoor heat exchanger 310 and the second indoor heat exchanger 320 are arranged in the three-pipe indoor unit 301.

[0086] Please refer to FIG. 3 and FIG. 4, in an embodiment, the heat exchange system 10 further has a third working mode and / or a fourth working mode, in the third working mode (as shown in FIG. 4), 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 divided into two parts, one part flows through the first indoor heat exchanger 310 to evaporate and absorb heat, and the other part flows through the second indoor heat exchanger 320 to evaporate and absorb heat, and then returns to the compressor 100; in the fourth working mode (as shown in FIG. 5), 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 divided into two parts, one part flows through the first outdoor heat exchanger 410 to evaporate and absorb heat, and the other part flows through the second outdoor heat exchanger 420 to evaporate and absorb heat, and then returns to the compressor 100.

[0087] It can be understood that, as shown in FIG. 4, 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 divided into two parts, one part flows through the first indoor heat exchanger 310 to evaporate and absorb heat, and the other part flows through the second indoor heat exchanger 320 to evaporate and absorb heat, and then returns to the compressor 100, so that the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have double evaporation temperature and evaporation pressure to perform indoor refrigeration in the circulation process of the refrigerant, which is beneficial to the cascade heat exchange in the first heat exchange device 300, that is, the cascade refrigeration in the indoor unit is realized, and the energy efficiency of the heat exchange system 10 is improved.

[0088] As shown in FIG. 5, in the fourth working mode, a part of the refrigerant flows through the first indoor heat exchanger 310 to condense and release heat, and performs indoor heating, and another part of the refrigerant flows through the second indoor heat exchanger 320 to condense and release heat, and performs indoor heating, and the refrigerant after releasing heat is gathered 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, so that in the circulation process of the refrigerant, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have double condensing temperature and condensing pressure to perform indoor heating, which is beneficial to the cascade heat exchange in the first heat exchange device 300, that is, the cascade heating in the indoor unit is realized, and the energy efficiency of the heat exchange system 10 is improved.

[0089] In an embodiment, the first heat exchange device 300 has a first air duct, 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 flowing into the first indoor heat exchanger 310 has a pressure greater than that of the refrigerant flowing into the second indoor heat exchanger 320.

[0090] It can be understood that in the third working mode, the heat exchange system 10 performs indoor cooling, air first flows through the first indoor heat exchanger 310 and then flows through the second indoor heat exchanger 320 in the first air duct, and then is blown out to the outside of the first heat exchange device 300, the refrigerant flowing into the first indoor heat exchanger 310 is high-pressure refrigerant, and has high evaporation pressure, and the refrigerant flowing into the second indoor heat exchanger 320 is medium-pressure refrigerant, and has low evaporation pressure, so that the refrigerant pressure in the first heat exchange device 300 can be set in a gradient in the third working mode, and the high-pressure refrigerant is beneficial to improving the cooling capacity relative to the 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 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 towards the air cooled by the medium-pressure refrigerant, so as to be beneficial to reducing the indoor cooling temperature, and the refrigerant flowing into the first indoor heat exchanger 310 and the second indoor heat exchanger 320 of the first heat exchange device 300 is set in high and low pressures, the indoor unit is cascade heat exchanged, which is beneficial to reducing the compression ratio of the compressor 100, so as to improve the energy efficiency of the heat exchange system 10.

[0091] In an embodiment, the compressor 100 has a first exhaust port 130 and a second exhaust port 140, and in the third working mode, the exhaust pressure of the first exhaust port 130 is greater than the exhaust pressure of the second exhaust port 140. In this way, in the third working mode, the first exhaust port 130 and the second exhaust port 140 of the compressor 100 discharge refrigerant of different pressures, the first exhaust port 130 discharges high-pressure refrigerant, and the second exhaust port 140 discharges medium-pressure refrigerant, so that the refrigerant flowing into the first indoor heat exchanger 310 has a greater pressure than the refrigerant flowing into the second indoor heat exchanger 320 without the need for an additional pressure regulating device, which is conducive to simplifying the structure of the heat exchange system 10 and ensuring that in the third working mode, the refrigerant in the first heat exchange device 300 can be designed to have high and low pressures, thereby reducing the pressure ratio of the compressor 100 and improving the energy efficiency of the heat exchange system 10.

[0092] In an 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, and in the fourth working mode, the refrigerant flowing into the first indoor heat exchanger 310 has a lower pressure than the refrigerant flowing into the second indoor heat exchanger 320.

[0093] It can be understood that in the fourth working mode, the heat exchange system 10 performs indoor heating, and air flows through the first indoor heat exchanger 310 in the first air duct first, 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 has a medium pressure and a low condensation pressure, and the refrigerant flowing into the second indoor heat exchanger 320 has a high pressure and a high condensation pressure, so that in the fourth working mode, the refrigerant in the first heat exchange device 300 can be arranged in a gradient, and the high-pressure refrigerant is conducive to improving the heating capacity relative to the medium-pressure refrigerant. When 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 improving the indoor heating temperature, and the refrigerant flowing into the first indoor heat exchanger 310 and the second indoor heat exchanger 320 of the first heat exchange device 300 is arranged in high and low pressures, which is conducive to reducing the pressure ratio of the compressor 100 and improving the energy efficiency of the heat exchange system 10.

[0094] In an embodiment, the compressor 100 has a first exhaust port 130 and a second exhaust port 140, and in the fourth working mode, the exhaust pressure of the first exhaust port 130 is lower than that of the second exhaust port 140. In this way, in the fourth working mode, the first exhaust port 130 and the second exhaust port 140 of the compressor 100 discharge refrigerants with different pressures, the first exhaust port 130 discharges medium-pressure refrigerant, and the second exhaust port 140 discharges high-pressure refrigerant, so that the pressure of the refrigerant flowing into the first indoor heat exchanger 310 is lower than that of the refrigerant flowing into the second indoor heat exchanger 320 without the need for an additional pressure regulating device, which is conducive to simplifying the structure of the heat exchange system 10 and ensuring that in the fourth working mode, the refrigerant in the first heat exchange device 300 can be designed with high and low pressures to reduce the pressure ratio of the compressor 100, thereby improving the energy efficiency of the heat exchange system 10.

[0095] Referring to FIG. 6, in another embodiment, the indoor unit is a four-tube indoor unit 302, and has a first connection port, a second connection port, a third connection port, and a fourth connection port, two ends of the first indoor heat exchanger 310 are respectively connected to the first connection port and the second connection port, and two ends of the second indoor heat exchanger 320 are respectively connected to the third connection port and the fourth connection port. The four-tube indoor unit 302 is connected to the switching device 200 through the first connection port and the third connection port, and is connected to the second heat exchange device 400 through the second connection port and the fourth connection port.

[0096] It can be understood that the four-tube indoor unit 302 differs from the three-tube indoor unit 301 in the connection mode with the second heat exchange device 400, i.e., the connection mode of the four-tube indoor unit 302 with the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420, for example, the four-tube indoor unit 302 is connected to the first outdoor heat exchanger 410 through the second connection port, and is connected to the second outdoor heat exchanger 420 through the fourth connection port. The first indoor heat exchanger 310 and the second indoor heat exchanger 320 of the four-tube indoor unit 302 can flexibly adjust the heat exchange temperature as needed, independently perform refrigeration or heating, which is conducive to improving the flexibility of installation and the heat exchange efficiency.

[0097] Please refer to Fig. 6, in an embodiment, the switching device 200 comprises the first reversing valve 210 and the second reversing valve 220, the heat exchange system 10 further comprises 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 with the first connecting port, the other end of the first gas pipe 16 is connected with the compressor 100 through the first reversing valve 210, the second connecting port is connected with the first outdoor heat exchanger 410 through the first liquid pipe 18, one end of the second gas pipe 17 is connected with the third connecting port, the other end of the second gas pipe 17 is connected with the compressor 100 through the second reversing valve 220, the fourth connecting port is connected with the second outdoor heat exchanger 420 through the second liquid pipe 19. In this way, the flow direction of the refrigerant in the heat exchange system 10 can be adjusted through the first reversing valve 210 and the second reversing valve 220, so that the heat exchange system 10 can realize multiple functions. For example, the compressor 100 communicates with 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, the compressor 100 communicates with 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, and the refrigerant flows through the first circulation loop and / or the second circulation loop to realize the functions of indoor refrigeration or heating.

[0098] In an embodiment, the compressor 100 has a first suction port 110, a second suction port 120, a first discharge port 130 and a second discharge port 140, the first reversing valve 210 connects the first suction port 110, the first discharge port 130, the first gas pipe 16 and the first outdoor heat exchanger 410, and the second reversing valve 220 connects the second suction port 120, the second discharge port 140, the second gas pipe 17 and the second outdoor heat exchanger 420.

[0099] It can be understood that the first suction port 110 and the second suction port 120 independently suck air respectively, and the suction pressures of the first suction port 110 and the second suction port 120 can be the same or different; the first discharge port 130 and the second discharge port 140 independently discharge air respectively, and the discharge pressures of the first discharge port 130 and the second discharge port 140 can be the same or different, so that the refrigerant pressures 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 scheme, the compressor 100 is a double-suction double-discharge compressor 100, which can be a double-cylinder double-suction double-discharge compressor 100, and two compression cylinders work at the same time to increase the suction volume and the discharge volume of the compressor 100, thereby improving the compression capacity of the compressor 100 and being beneficial to improving the energy efficiency of the heat exchange system 10.

[0100] Please refer to FIG. 6 to FIG. 8, in an embodiment, the switching device 200 further comprises a first bypass pipe 230 and a first bypass valve 240, the first switching valve 210 is connected with the first suction port 110 through a first connecting pipe 14, the second switching valve 220 is connected with the second suction port 120 through a second connecting pipe 15, one end of the first bypass pipe 230 is connected with the first connecting pipe 14, the other end of the first bypass pipe 230 is connected with 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 for controlling the opening and closing of the first bypass pipe 230.

[0101] It can be understood that 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. Specifically, in the first working mode, part of the refrigerant flowing out of the second connecting pipe 15 flows back to the compressor 100 through the second suction port 120, by arranging the first bypass pipe 230 and the first bypass valve 240, the first bypass valve 240 is opened, so that another part of the refrigerant in the second connecting pipe 15 can be branched along the first bypass pipe 230 to the first connecting pipe 14 and flow through the first suction port 110 to return to the compressor 100, so as to realize the functions of double suction and double discharge of the compressor 100 and non-supercooling defrosting of the heat exchange system 10. In the second working mode, part of the refrigerant flowing out of the first connecting pipe 14 flows back to the compressor 100 through the first suction port 110, by arranging the first bypass pipe 230 and the first bypass valve 240, the first bypass valve 240 is opened, so that another part of the refrigerant in the first connecting pipe 14 can be branched along the first bypass pipe 230 to the second connecting pipe 15 and flow through the second suction port 120 to return to the compressor 100, so as to realize the functions of double suction and double discharge of the compressor 100 and constant temperature dehumidification of the heat exchange system 10. The connection mode of the first bypass pipe 230 and the first bypass valve 240 in the heat exchange system 10 is simple, so that the heat exchange system 10 is easy to realize the functions of non-supercooling defrosting and constant temperature dehumidification. In addition, the first bypass valve 240 can be an electromagnetic valve, specifically a single-way electromagnetic valve.

[0102] Please refer to FIG. 6 to FIG. 8, in an embodiment, the switching device 200 further comprises a second bypass pipe 270 and a second bypass valve 280, one end of the second bypass pipe 270 is connected with the first liquid pipe 18, the other end of the second bypass pipe 270 is connected with the second liquid pipe 19, the second bypass valve 280 is arranged in the second bypass pipe 270, and the second bypass valve 280 is used for controlling the opening and closing of the second bypass pipe 270.

[0103] It can be understood that in the first working mode or the second working mode, the second bypass valve 280 is opened, and the second bypass pipe 270 connects the first liquid pipe 18 and the second liquid pipe 19. Specifically, in the first working mode, part of the refrigerant flows into the second liquid pipe 19 from the fourth connecting port after flowing through the second indoor heat exchanger 320, and another part of the refrigerant flows into the first liquid pipe 18 after flowing through the first outdoor heat exchanger 410. Because the first indoor heat exchanger 310 stops heat exchange, the second bypass valve 280 is opened, so that another part of the refrigerant in the first liquid pipe 18 can flow into the second liquid pipe 19 along the second bypass pipe 270, and the two parts of the refrigerant are gathered together in the second liquid pipe 19, and then flow through the second outdoor heat exchanger 420 to evaporate and absorb heat and then return to the compressor 100, thereby realizing the function of frost-free of the heat exchange system 10. In the second working mode, part of the refrigerant flows into the first liquid pipe 18 after flowing through the first outdoor heat exchanger 410, and another part of the refrigerant flows into the second liquid pipe 19 from the fourth connecting port after flowing through the second indoor heat exchanger 320. Because the second outdoor heat exchanger 420 stops heat exchange, the second bypass valve 280 is opened, so that another part of the refrigerant in the second liquid pipe 19 can flow into the first liquid pipe 18 along the second bypass pipe 270, and the two parts of the refrigerant are gathered together in the first liquid pipe 18, and then flow through the first indoor heat exchanger 310 to evaporate and absorb heat and then return to the compressor 100, thereby realizing the function of constant temperature dehumidification of the heat exchange system 10. The connection mode of the second bypass pipe 270 and the second bypass valve 280 in the heat exchange system 10 is simple, so that the heat exchange system 10 is easy to realize the functions of frost-free and constant temperature dehumidification. In addition, the second bypass valve 280 can be an electromagnetic valve, specifically a single-way electromagnetic valve.

[0104] Referring to FIGS. 1-3, the application further provides a heat exchange system 10, which comprises 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 comprises at least one three-pipe indoor unit 301, which has a first indoor heat exchanger 310, a second indoor heat exchanger 320, a first interface, a second interface and a third interface. Two ends of the first indoor heat exchanger 310 are connected to the first interface and the third interface respectively. Two ends of the second indoor heat exchanger 320 are connected to the second interface and the third interface respectively. The three-pipe indoor unit 301 is connected to the switching device 200 through the first interface and the second interface. 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 by 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, so as 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 is divided into two parts to flow through 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 is divided into two parts to flow through 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.

[0105] 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, i.e., the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are two independent heat exchangers, and can work independently respectively, so that the heat exchange system 10 has at least the third working mode and the fourth working mode, and the heat exchange system 10 has strong functionality.

[0106] In the third working mode, a part of refrigerant flows through the first outdoor heat exchanger 410 to condense and release heat, and another part of refrigerant flows through the second outdoor heat exchanger 420 to condense and release heat, and then converges together, a part of refrigerant is branched to the first indoor heat exchanger 310 to evaporate and absorb heat to perform indoor refrigeration, and then returns to the compressor 100, and another part of refrigerant is branched to the second indoor heat exchanger 320 to evaporate and absorb heat to perform indoor refrigeration, and then returns to the compressor 100, so that in the circulation process of the refrigerant, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have double evaporation temperatures and evaporation pressures to perform indoor refrigeration, which is beneficial to the cascade heat exchange in the first heat exchange device 300, that is, the cascade refrigeration in the indoor unit is realized, and the energy efficiency of the heat exchange system 10 is improved.

[0107] In the fourth working mode, a part of refrigerant flows through the first indoor heat exchanger 310 to condense and release heat to perform indoor heating, and another part of refrigerant flows through the second indoor heat exchanger 320 to condense and release heat to perform indoor heating, and then converges together, and is branched 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, so that in the circulation process of the refrigerant, the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have double condensation temperatures and condensation pressures to perform indoor heating, which is beneficial to the cascade heat exchange in the first heat exchange device 300, that is, the cascade heating in the indoor unit is realized, and the energy efficiency of the heat exchange system 10 is improved.

[0108] In an 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 flowing into the first indoor heat exchanger 310 has a pressure greater than that of the refrigerant flowing into the second indoor heat exchanger 320.

[0109] It can be understood that in the third working mode, the heat exchange system 10 performs indoor refrigeration, air flows through the first indoor heat exchanger 310 first and then the second indoor heat exchanger 320 in the first air duct, and is blown out to the outside of the three-pipe indoor unit 301, the refrigerant flowing into the first indoor heat exchanger 310 is high-pressure refrigerant with high evaporation pressure, and the refrigerant flowing into the second indoor heat exchanger 320 is medium-pressure refrigerant with low evaporation pressure, so that the refrigerant pressure in the three-pipe indoor unit 301 in the third working mode can be set in a gradient, and the high-pressure refrigerant is beneficial to improve the refrigeration capacity relative to the 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 high-pressure refrigerant in the three-pipe indoor unit 301 and then flows through the medium-pressure refrigerant, the air refrigerated by the high-pressure refrigerant is blown into the indoor in the direction of the air refrigerated by the medium-pressure refrigerant, so as to be beneficial to reduce the indoor refrigeration temperature, and the refrigerant flowing into the first indoor heat exchanger 310 and the second indoor heat exchanger 320 of the three-pipe indoor unit 301 adopts high and low pressure setting, the indoor unit gradient heat exchange is beneficial to reduce the compression ratio of the compressor 100, so as to be able to improve the energy efficiency of the heat exchange system 10.

[0110] In an 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.

[0111] It can be understood that in the fourth working mode, the heat exchange system 10 performs indoor heating, air flows through the first indoor heat exchanger 310 first and then the second indoor heat exchanger 320 in the first air duct, and is blown out to the outside of the three-pipe indoor unit 301, the refrigerant flowing into the first indoor heat exchanger 310 is medium-pressure refrigerant with low condensation pressure, and the refrigerant flowing into the second indoor heat exchanger 320 is high-pressure refrigerant with high condensation pressure, so that the refrigerant pressure in the three-pipe indoor unit 301 in the fourth working mode can be set in a gradient, and the high-pressure refrigerant is beneficial to improve the heating capacity relative to the 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-pipe indoor unit 301 and then flows through the high-pressure refrigerant, the air heated by the medium-pressure refrigerant is blown into the indoor in the direction of the air heated by the high-pressure refrigerant, so as to be beneficial to improve the indoor heating temperature, and the refrigerant flowing into the first indoor heat exchanger 310 and the second indoor heat exchanger 320 of the three-pipe indoor unit 301 adopts high and low pressure setting, the indoor unit gradient heat exchange is beneficial to reduce the compression ratio of the compressor 100, so as to be able to improve the energy efficiency of the heat exchange system 10.

[0112] In an embodiment, the switching device 200 comprises a first reversing valve 210 and a second reversing valve 220, and the heat exchange system 10 further comprises a first pipeline 11, a second pipeline 12 and a third pipeline 13. One end of the first pipeline 11 is connected with the first interface, and the other end of the first pipeline 11 is connected with the compressor 100 through the first reversing valve 210. One end of the second pipeline 12 is connected with the second interface, and the other end of the second pipeline 12 is connected with the compressor 100 through the second reversing valve 220. One end of the third pipeline 13 is connected with the third interface, and the other end of the third pipeline 13 is connected with the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420. In this way, the flow direction of the refrigerant in the heat exchange system 10 can be adjusted through the first reversing valve 210 and the second reversing valve 220, so that the heat exchange system 10 can realize indoor refrigeration or heating.

[0113] In addition, the first reversing valve 210 and the second reversing valve 220 can be composed of multiple valve bodies, or can be four-way reversing valves, which are not limited in particular in this embodiment. 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 four-way reversing valve can simply and effectively switch the flow direction of the refrigerant, so that the structure of the heat exchange system 10 is simple and easy to assemble.

[0114] In an embodiment, the compressor 100 has a first suction port 110, a second suction port 120, a first discharge port 130 and a second discharge port 140. The first reversing valve 210 is connected with the first suction port 110, the first discharge port 130, the first pipeline 11 and the first outdoor heat exchanger 410. The second reversing valve 220 is connected with the second suction port 120, the second discharge port 140, the second pipeline 12 and the second outdoor heat exchanger 420.

[0115] It can be understood that the first suction port 110 and the second suction port 120 independently suck air respectively, the suction pressures of the first suction port 110 and the second suction port 120 can be the same or different; the first exhaust port 130 and the second exhaust port 140 independently exhaust air respectively, the exhaust pressures of the first exhaust port 130 and the second exhaust port 140 can be the same or different, so that the refrigerant pressures 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 working modes. In the present scheme, the compressor 100 is a double-suction double-exhaust compressor 100, specifically a double-cylinder double-suction double-exhaust compressor 100, which utilizes two compression cylinders to work simultaneously, thereby increasing the suction volume and the exhaust volume of the compressor 100, and thus improving the compression capacity of the compressor 100, and cooperating with the three-pipe indoor unit 301, which is conducive to improving the energy efficiency of the heat exchange system 10 during refrigeration or heating.

[0116] In an embodiment, the compressor 100 has the first exhaust port 130 and the second exhaust port 140, and in the third working mode, the exhaust pressure of the first exhaust port 130 is greater than the exhaust pressure of the second exhaust port 140. In this way, in the third working mode, the first exhaust port 130 and the second exhaust port 140 of the compressor 100 discharge refrigerants with different pressures, the first exhaust port 130 discharges high-pressure refrigerant, and the second exhaust port 140 discharges medium-pressure refrigerant, so that 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 without the need for additional pressure adjusting devices, which is conducive to simplifying the structure of the heat exchange system 10 and ensuring that the refrigerant in the first heat exchange device 300 can adopt a high-low pressure design in the third working mode of the heat exchange system 10, thereby reducing the pressure ratio of the compressor 100 and improving the energy efficiency of the heat exchange system 10.

[0117] In an embodiment, the compressor 100 has the first exhaust port 130 and the second exhaust port 140, and in the fourth working mode, the exhaust pressure of the first exhaust port 130 is less than the exhaust pressure of the second exhaust port 140. In this way, in the fourth working mode, the first exhaust port 130 and the second exhaust port 140 of the compressor 100 discharge refrigerants with different pressures, the first exhaust port 130 discharges medium-pressure refrigerant, and the second exhaust port 140 discharges high-pressure refrigerant, so that 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 without the need for additional pressure adjusting devices, which is conducive to simplifying the structure of the heat exchange system 10 and ensuring that the refrigerant in the first heat exchange device 300 can adopt a high-low pressure design in the fourth working mode of the heat exchange system 10, thereby reducing the pressure ratio of the compressor 100 and improving the energy efficiency of the heat exchange system 10.

[0118] The application further provides an air conditioner comprising the heat exchange system as described above, and the specific structure of the heat exchange system is referred to the above-mentioned embodiments. Since the air conditioner adopts all the technical solutions of the above-mentioned embodiments, it has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0119] The above merely describes exemplary embodiments of the application, and does not limit the patent scope of the application. Any equivalent structural transformation made by referring to the content of the specification and drawings, or direct / indirect application in other related technical fields under the technical concept of the application is included in the patent protection scope of the application.

Claims

1. A heat exchange system, wherein, The heat exchange system comprises 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 with the first indoor heat exchanger, the second indoor heat exchanger, the first outdoor heat exchanger and the second outdoor heat exchanger through the switching 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 as 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 refrigerant flows through the second indoor heat exchanger to condense and release heat, and another part of refrigerant flows through the first outdoor heat exchanger to condense and release heat, and then the two parts of refrigerant converge together, and then flow through the second outdoor heat exchanger to evaporate and absorb heat, and then return to the compressor; In the second working mode, the second outdoor heat exchanger stops heat exchange, a part of refrigerant flows through the first outdoor heat exchanger to condense and release heat, and another part of refrigerant flows through the second indoor heat exchanger to condense and release heat, and then the two parts of refrigerant converge together, and then flow through the first indoor heat exchanger to evaporate and absorb heat, and then return to the compressor.

2. The heat exchange system of claim 1, wherein, The first heat exchange device comprises 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 of claim 2, wherein, The indoor unit is a three-tube indoor unit, and has a first interface, a second interface and a third interface; two ends of the first indoor heat exchanger are connected with the first interface and the third interface respectively; two ends of the second indoor heat exchanger are connected with the second interface and the third interface respectively; the three-tube indoor unit is connected with the switching device through the first interface and the second interface; and the three-tube indoor unit is connected with the second heat exchange device through the third interface.

4. The heat exchange system of claim 3, wherein, The switching device comprises a first reversing valve and a second reversing valve; the heat exchange system further comprises a first pipeline, a second pipeline and a third pipeline; one end of the first pipeline is connected with the first interface; the other end of the first pipeline is connected with the compressor through the first reversing valve; one end of the second pipeline is connected with the second interface; the other end of the second pipeline is connected with the compressor through the second reversing valve; one end of the third pipeline is connected with the third interface; and the other end of the third pipeline is connected with the first outdoor heat exchanger and the second outdoor heat exchanger.

5. The heat exchange system of claim 4, wherein, The compressor has a first suction port, a second suction port, a first discharge port and a second discharge port; the first reversing valve is connected with the first suction port, the first discharge port, the first pipeline and the first outdoor heat exchanger; and the second reversing valve is connected with the second suction port, the second discharge port, the second pipeline and the second outdoor heat exchanger.

6. The heat exchange system of claim 5, wherein, The switching device further comprises a first bypass pipe and a first bypass valve, the first switching valve is connected with the first suction port through a first connecting pipe, the second switching valve is connected with the second suction port through a second connecting pipe, one end of the first bypass pipe is connected with the first connecting pipe, the other end of the first bypass pipe is connected with the second connecting pipe, and the first bypass valve is arranged on the first bypass pipe and used for controlling the opening and closing of the first bypass pipe. In the first working mode or the second working mode, the first bypass valve is opened, and the first bypass pipe connects the first connecting pipe and the second connecting pipe.

7. The heat exchange system of claim 3, wherein, The first heat exchange device further comprises a first indoor throttling element and a second indoor throttling element, the first indoor throttling element is arranged on a pipeline through which the first indoor heat exchanger is connected with the third interface, and the second indoor throttling element is arranged on a pipeline through which the second indoor heat exchanger is connected with the third interface.

8. The heat exchange system of claim 3, wherein, The switching device further comprises a first outdoor throttling element and a second outdoor throttling element, the first outdoor throttling element is arranged on a pipeline through which the first outdoor heat exchanger is connected with the third pipeline, and the second outdoor throttling element is arranged on a pipeline through which the second outdoor heat exchanger is connected with the third pipeline.

9. The heat exchange system of any one of claims 1 to 8, wherein, The heat exchange system further has a third working mode and / or a fourth working mode, In the third working mode, a part of refrigerant flows through the first outdoor heat exchanger to condense and release heat, another part of refrigerant flows through the second outdoor heat exchanger to condense and release heat, and then the two parts of refrigerant are gathered together and then divided into two parts to flow through the first indoor heat exchanger and the second indoor heat exchanger to evaporate and absorb heat, and then the two parts of refrigerant return to the compressor; In the fourth working mode, a part of refrigerant flows through the first indoor heat exchanger to condense and release heat, another part of refrigerant flows through the second indoor heat exchanger to condense and release heat, and then the two parts of refrigerant are gathered together and then divided into two parts to flow through the first outdoor heat exchanger and the second outdoor heat exchanger to evaporate and absorb heat, and then the two parts of refrigerant return to the compressor.

10. The heat exchange system of claim 9, wherein, The first heat exchange device has a first air duct, the first indoor heat exchanger is arranged upstream of the second indoor heat exchanger along the air outflow direction of the first air duct, in the third working mode, the refrigerant flowing into the first indoor heat exchanger has a pressure greater than that of the refrigerant flowing into the second indoor heat exchanger, And / or, in the fourth working mode, the refrigerant flowing into the first indoor heat exchanger has a pressure less than that of the refrigerant flowing into the second indoor heat exchanger.

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

12. The heat exchange system of claim 11, wherein, The switching device includes the first reversing valve and the second reversing valve, and the heat exchange system further includes a first gas pipe, a second gas pipe, a first liquid pipe and a second liquid pipe, one end of the first gas pipe is connected with the first connecting port, the other end of the first gas pipe is connected with the compressor through the first reversing valve, the second connecting port is connected with the first outdoor heat exchanger through the first liquid pipe, one end of the second gas pipe is connected with the third connecting port, the other end of the second gas pipe is connected with the compressor through the second reversing valve, and the fourth connecting port is connected with the second outdoor heat exchanger through the second liquid pipe.

13. The heat exchange system of claim 12, wherein, The compressor has a first suction port, a second suction port, a first discharge port and a second discharge port, the first reversing valve is connected with the first suction port, the first discharge port, the first gas pipe and the first outdoor heat exchanger, and the second reversing valve is connected with the second suction port, the second discharge port, the second gas pipe and the second outdoor heat exchanger.

14. The heat exchange system of claim 13, wherein, The switching device further includes a first bypass pipe and a first bypass valve, the first reversing valve is connected with the first suction port through a first connecting pipe, the second reversing valve is connected with the second suction port through a second connecting pipe, one end of the first bypass pipe is connected with the first connecting pipe, the other end of the first bypass pipe is connected with the second connecting pipe, and the first bypass valve is arranged in the first bypass pipe and used for controlling the opening and closing of the first bypass pipe.

15. The heat exchange system of claim 12, wherein, The switching device further includes a second bypass pipe and a second bypass valve, one end of the second bypass pipe is connected with the first liquid pipe, the other end of the second bypass pipe is connected with the second liquid pipe, and the second bypass valve is arranged in the second bypass pipe and used for controlling the opening and closing of the second bypass pipe.

16. A heat exchange system wherein, 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 has a first indoor heat exchanger, a second indoor heat exchanger, a first interface, a second interface and a third interface, two ends of the first indoor heat exchanger are respectively connected with the first interface and the third interface, two ends of the second indoor heat exchanger are respectively connected with the second interface and the third interface, the three-pipe indoor unit is connected with the switching device through the first interface and the second interface, and the three-pipe indoor unit is connected with the second heat exchange device through 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 for controlling the refrigerant discharged by 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, so as 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 to condense and release heat, another part of the refrigerant flows through the second outdoor heat exchanger to condense and release heat, and then the two parts of the refrigerant are gathered together, and then the refrigerant is divided into two parts to flow through the first indoor heat exchanger and the second indoor heat exchanger to evaporate and absorb heat, and then the refrigerant returns to the compressor; In the fourth working mode, a part of the refrigerant flows through the first indoor heat exchanger to condense and release heat, and another part of the refrigerant flows through the second indoor heat exchanger to condense and release heat, and then converges together, and 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 of 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 outflow direction of the first air duct; in the third working mode, the refrigerant flowing into the first indoor heat exchanger has a pressure greater than that of the refrigerant flowing into the second indoor heat exchanger. And / or, in the fourth working mode, the refrigerant flowing into the first indoor heat exchanger has a pressure less than that of the refrigerant flowing into the second indoor heat exchanger.

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

19. The heat exchange system of claim 18, wherein, The compressor has a first suction port, a second suction port, a first discharge port and a second discharge port, the first reversing valve is connected with the first suction port, the first discharge port, the first pipeline and the first outdoor heat exchanger, and the second reversing valve is connected with the second suction port, the second discharge port, the second pipeline and the second outdoor heat exchanger.

20. An air conditioner, comprising: The air conditioner includes the heat exchange system according to any one of claims 1 to 19.

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