Heat exchange system and air conditioner

Abstract

The utility model discloses a heat exchange system and an air conditioner. The heat exchange system comprises a compressor, a switching device, a first heat exchange device, a second heat exchange device and a bypass assembly. The compressor is provided with an air suction port, a first exhaust port and a second exhaust port. A first exhaust port of the compressor communicates with the second heat exchange device, the first indoor heat exchanger and the air suction port through the switching device to form a first circulation loop. A second exhaust port of the compressor is communicated with the second heat exchange device, the second indoor heat exchanger and the air suction port through the switching device to form a second circulation loop; the bypass assembly comprises a bypass pipeline and a bypass valve, one end of the bypass pipeline communicates with the second exhaust port, the other end of the bypass pipeline communicates with the air suction port, and the bypass valve is arranged on the bypass pipeline and used for controlling on-off of the bypass pipeline. The heat exchange system can solve the problem that the energy efficiency of an existing heat exchange system is low due to high energy consumption of the compressor when the existing heat exchange system is in a low-load operation condition.

Description

Technical Field

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

[0002] In existing heat exchange systems, such as multi-split air conditioning systems, the compressor is usually in a low-frequency operation state when operating under low-load conditions (for example, only one of multiple indoor units is turned on and running). The compressor's operating efficiency is low, and the compressor is prone to completing the cooling or heating task in a short period of time and entering a "compression-stop-restart" cycle, causing the compressor to frequently start and stop. This not only causes indoor temperature fluctuations, but also leads to high energy consumption of the compressor, resulting in low energy efficiency of the heat exchange system. Utility Model Content

[0003] The main purpose of the utility model is to provide a heat exchange system and an air conditioner, aiming to solve the problem of low energy efficiency of the heat exchange system caused by high energy consumption of the compressor when the existing heat exchange system is operating under low load conditions.

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

[0005] The compressor has an air intake port, a first air discharge port, and a second air discharge port;

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

[0007] The first exhaust port of the compressor is connected to the second heat exchange device, the first indoor heat exchanger and the air intake port via the switching device to form a first circulation loop; the second exhaust port of the compressor is connected to the second heat exchange device, the second indoor heat exchanger and the air intake port via the switching device to form a second circulation loop;

[0008] The bypass assembly includes a bypass pipeline and a bypass valve. One end of the bypass pipeline is connected to the second exhaust port, and the other end of the bypass pipeline is connected to the intake port. The bypass valve is arranged on the bypass pipeline and is used to control the on and off of the bypass pipeline.

[0009] In one embodiment, the heat exchange system has a first operating mode. In the first operating mode, the first indoor heat exchanger operates, the second indoor heat exchanger stops heat exchange, the refrigerant discharged from the first exhaust port of the compressor flows along the first circulation loop, the bypass valve is opened, and the bypass pipe connects the second exhaust port and the intake port.

[0010] In one embodiment, the rated power of the heat exchange system is P1, the current operating power of the heat exchange system is P2, and in the first operating mode, the ratio of P2 to P1 is not greater than 0.4.

[0011] In one embodiment, in the first operation mode, the compressor operates at a low frequency, and the frequency of the low frequency operation of the compressor is no greater than 40 Hz.

[0012] In one embodiment, the switching device includes a first reversing valve and a second reversing valve, the first reversing valve connecting the air intake port, the first exhaust port, the second heat exchange device, and the first indoor heat exchanger; the second reversing valve connecting the air intake port, the second exhaust port, the second heat exchange device, and the second indoor heat exchanger;

[0013] The second reversing valve is connected to the second exhaust port through a first connecting pipe, the second reversing valve is connected to the intake port through a second connecting pipe, one end of the bypass line is connected to the first connecting pipe, and the other end of the bypass line is connected to the second connecting pipe.

[0014] In one embodiment, the bypass valve is connected in series with the bypass line, and the bypass valve is located between an inlet and an outlet of the bypass line.

[0015] In one embodiment, the bypass valve is connected in series with the first connecting pipe, the bypass valve is located between the inlet and the outlet of the first connecting pipe, and the bypass valve is connected to the inlet of the bypass line;

[0016] Alternatively, the bypass valve is connected in series with the second connecting pipe, the bypass valve is located between the inlet and the outlet of the second connecting pipe, and the bypass valve is connected to the outlet of the bypass pipeline.

[0017] In one embodiment, the compressor is a two-cylinder compressor, which includes a casing and a first cylinder and a second cylinder arranged in the casing. The casing is provided with the intake port, the first exhaust port and the second exhaust port. The exhaust channel of the first cylinder is connected to the first exhaust port, and the exhaust channel of the second cylinder is connected to the second exhaust port. The volume ratio of the first cylinder and the second cylinder ranges from 0.2 to 5.

[0018] In one embodiment, the air intake port includes a first air intake port and a second air intake port, the first air intake port and the second air intake port are spaced apart on the casing, the first air intake port is connected to the first circulation loop, and the second air intake port is connected to the second circulation loop.

[0019] In one embodiment, the first heat exchange device includes a first two-pipe control indoor unit and a second two-pipe control indoor unit, the first two-pipe control indoor unit has the first indoor heat exchanger, and the second two-pipe control indoor unit has the second indoor heat exchanger, the switching device includes a first reversing valve and a second reversing valve, the compressor is connected to the second heat exchange device and the first two-pipe control indoor unit via the first reversing valve to form the first circulation loop, and the compressor is connected to the second heat exchange device and the second two-pipe control indoor unit via the second reversing valve to form the second circulation loop.

[0020] In one embodiment, the first heat exchange device includes at least one three-pipe indoor unit, the three-pipe indoor unit having the first indoor heat exchanger, the second indoor heat exchanger, a first interface, a second interface and a third interface, the two ends of the first indoor heat exchanger are respectively connected to the first interface and the third interface, the two ends of the second indoor heat exchanger are respectively connected to the second interface and the third interface, the three-pipe indoor unit is connected to the switching device through the first interface and the second interface, and the three-pipe indoor unit is connected to the second heat exchange device through the third interface.

[0021] In one embodiment, the switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first pipeline, a second pipeline and a third pipeline, one end of the first pipeline is connected to the first interface, and the other end of the first pipeline is connected to the compressor through the first reversing valve, one end of the second pipeline is connected to the second interface, and the other end of the second pipeline is connected to the compressor through the second reversing valve, one end of the third pipeline is connected to the third interface, and the other end of the third pipeline is connected to the second heat exchange device.

[0022] In one embodiment, the first heat exchange device includes at least one four-pipe indoor unit, the four-pipe indoor unit having the first indoor heat exchanger, the second indoor heat exchanger, a first connection port, a second connection port, a third connection port and a fourth connection port, the two ends of the first indoor heat exchanger are respectively connected to the first connection port and the second connection port, the two ends of the second indoor heat exchanger are respectively connected to the third connection port and the fourth connection port, the four-pipe indoor unit is connected to the switching device through the first connection port and the third connection port, the second heat exchange device has a first outdoor heat exchanger and a second outdoor heat exchanger, the second connection port is connected to the first outdoor heat exchanger, and the fourth connection port is connected to the second outdoor heat exchanger.

[0023] In one embodiment, the switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first air pipe, a second air pipe, a first liquid pipe and a second liquid pipe, one end of the first air pipe is connected to the first connecting port, the other end of the first air pipe is connected to the compressor through the first reversing valve, the second connecting port is connected to the first outdoor heat exchanger through the first liquid pipe, one end of the second air pipe is connected to the third connecting port, the other end of the second air pipe is connected to the compressor through the second reversing valve, and the fourth connecting port is connected to the second outdoor heat exchanger through the second liquid pipe.

[0024] The present invention also provides an air conditioner, which includes the heat exchange system as described above.

[0025] The heat exchange system of the present invention includes a compressor, a switching device, a first heat exchange device, a second heat exchange device and a bypass assembly. The first exhaust port of the compressor is connected to the second heat exchange device, the first indoor heat exchanger and the air intake via the switching device to form a first circulation loop. The second exhaust port of the compressor is connected to the second heat exchange device, the second indoor heat exchanger and the air intake via the switching device to form a second circulation loop; the bypass assembly includes a bypass pipe and a bypass valve, one end of the bypass pipe is connected to the second exhaust port, and the other end of the bypass pipe is connected to the air intake. The bypass valve is arranged on the bypass pipe, and the bypass valve is used to control the on and off of the bypass pipe. Such arrangement enables the heat exchange system to have a first operating mode, and the control device of the heat exchange system operates the first operating mode when receiving a low-load control signal, that is, in the first operating mode, the control device controls the operation of the first indoor heat exchanger, the refrigerant in the second indoor heat exchanger does not flow, and the second indoor heat exchanger stops heat exchange, so that the operating load of the heat exchange system is relatively small, and the heat exchange system is in a low-load operating condition. At this time, the refrigerant discharged from the first exhaust port of the compressor flows along the first circulation loop, and the bypass valve is controlled to open, and the bypass pipeline connects the second exhaust port and the intake port, so that the high-pressure refrigerant discharged from the second exhaust port of the compressor flows through the bypass pipeline and directly flows back to the intake port of the compressor. During this process, the part of high-pressure refrigerant discharged from the second exhaust port of the compressor is not heat exchanged and depressurized, and there is no pressure difference between the suction pressure and the exhaust pressure of this part of the refrigerant, so that the overall heat exchange and energy consumption of the heat exchange system are reduced. That is, when the heat exchange system in this scheme is in a low-load operating condition, the energy consumption of the heat exchange system is reduced, and the minimum cooling capacity or minimum heating capacity of the heat exchange system is reduced, thereby expanding the range of the minimum heat exchange of the heat exchange system, so that the compressor can maintain a low-frequency operation state for a long time when the heat exchange system is in a low-load operating condition, avoiding the increase in energy consumption caused by the frequent opening and closing of the compressor when it is in low-frequency operation, and improving the energy efficiency of the compressor and the heat exchange system. It can be seen from this that the heat exchange system of the present application can expand the range of the minimum heat exchange of the heat exchange system when it is in a low-load operating condition, avoid the increase in energy consumption caused by the frequent opening and closing of the compressor when it is in low-frequency operation, thereby improving the energy efficiency of the compressor and the heat exchange system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 A schematic structural diagram of a first embodiment of a heat exchange system provided by the present utility model;

[0028] Figure 2 for Figure 1 A schematic structural diagram of the heat exchange system in the first operating mode;

[0029] Figure 3 This is a structural diagram of the second embodiment of the heat exchange system provided by the present utility model in the first operating mode;

[0030] Figure 4 A schematic structural diagram of a third embodiment of a heat exchange system provided by the present invention;

[0031] Figure 5 for Figure 4 A schematic structural diagram of the heat exchange system in the first operating mode;

[0032] Figure 6 This is a structural diagram of the fourth embodiment of the heat exchange system provided by the present utility model in the first operating mode;

[0033] Figure 7 A schematic structural diagram of the fifth embodiment of the heat exchange system provided by the present utility model in the first operating mode;

[0034] Figure 8 A schematic structural diagram of a sixth embodiment of a heat exchange system provided by the present utility model;

[0035] Figure 9 for Figure 8 A schematic structural diagram of the heat exchange system in the first operating mode;

[0036] Figure 10 This is a structural diagram of the seventh embodiment of the heat exchange system provided by the present utility model in the first operating mode.

[0037] Description of Figure Numbers:

[0038] 10. Heat exchange system;

[0039] 100, compressor; 110, air intake; 111, first air intake; 112, second air intake; 120, first exhaust; 130, second exhaust; 140, first cylinder; 150, second cylinder;

[0040] 200, switching device; 210, first reversing valve; 220, second reversing valve; 230, outdoor throttling element;

[0041] 300, first heat exchange device; 301, first two-pipe indoor unit; 302, second two-pipe indoor unit; 303, three-pipe indoor unit; 304, four-pipe indoor unit; 310, first indoor heat exchanger; 320, second indoor heat exchanger; 330, first indoor throttling element; 340, second indoor throttling element;

[0042] 400, second heat exchange device; 410, first outdoor heat exchanger; 420, second outdoor heat exchanger;

[0043] 500, bypass assembly; 510, bypass pipeline; 520, bypass valve;

[0044] 11. First connecting pipe; 12. Second connecting pipe; 13. First pipeline; 14. Second pipeline; 15. Third pipeline; 16. First air pipe; 17. Second air pipe; 18. First liquid pipe; 19. Second liquid pipe.

[0045] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0049] In existing heat exchange systems, such as multi-split air conditioning systems, the compressor is usually in a low-frequency operation state when operating under low-load conditions (for example, only one of multiple indoor units is turned on and running). The compressor's operating efficiency is low, and the compressor is prone to completing the cooling or heating task in a short period of time and entering a "compression-stop-restart" cycle, causing the compressor to frequently start and stop. This not only causes indoor temperature fluctuations, but also leads to high energy consumption of the compressor, resulting in low energy efficiency of the heat exchange system.

[0050] In order to solve the above problems, the present application proposes a heat exchange system and an air conditioner including the heat exchange system. When the heat exchange system is operating under low load conditions, the heat exchange system can expand the minimum heat exchange range of the heat exchange system, avoid the increase in energy consumption caused by frequent opening and closing of the compressor during low-frequency operation, thereby improving the energy efficiency of the heat exchange system.

[0051] See also Figure 1 and Figure 2 In an embodiment of the heat exchange system 10 of the present invention, the heat exchange system 10 includes a compressor 100, a switching device 200, a first heat exchange device 300, a second heat exchange device 400 and a bypass assembly 500; the compressor 100 has an air intake port 110, a first exhaust port 120 and a second exhaust port 130; the first heat exchange device 300 has a first indoor heat exchanger 310 and a second indoor heat exchanger 320; the first exhaust port 120 of the compressor 100 is connected to the second heat exchange device 400, the first indoor heat exchanger 310 and the air intake port 110 via the switching device 200 The first circulation loop is formed; the second exhaust port 130 of the compressor 100 is connected to the second heat exchange device 400, the second indoor heat exchanger 320 and the air intake port 110 through the switching device 200 to form a second circulation loop; the bypass component 500 includes a bypass pipe 510 and a bypass valve 520, one end of the bypass pipe 510 is connected to the second exhaust port 130, and the other end of the bypass pipe 510 is connected to the air intake port 110, and the bypass valve 520 is provided on the bypass pipe 510, and the bypass valve 520 is used to control the on and off of the bypass pipe 510.

[0052] It is understood that both the first indoor heat exchanger 310 and the second indoor heat exchanger 320 have heat exchange channels. The specific number and shape of the heat exchange channels are not limited. For example, they can be tubular or sheet-shaped, and of course they can also be in other shapes. The number of air intakes 110 of the compressor 100 is not limited, and can be one, two, three, or more. The number of exhaust ports of the compressor 100 is also not limited. The exhaust ports of the compressor 100 include at least a first exhaust port 120 and a second exhaust port 130. Of course, they can also include a third exhaust port, a fourth exhaust port, etc., and can be specifically configured as needed. In other words, the compressor 100 can be a single-suction, double-row compressor, a double-suction, double-row compressor, or a multi-suction, multi-row compressor.

[0053] In one embodiment, the second heat exchange device 400 can be an outdoor unit, and the second heat exchange device 400 includes an outdoor heat exchanger. The number of outdoor heat exchangers is not limited and can be one, two, three, or more, and can be specifically set according to needs.

[0054] Furthermore, one end of the bypass line 510 is connected to the second exhaust port 130. The bypass line 510 can be connected to the second exhaust port 130 through a valve body, or through a valve body and a pipeline. The other end of the bypass line 510 is connected to the air intake port 110. The bypass line 510 can be connected to the air intake port 110 through a valve body, or through a valve body and a pipeline. The specific details are not limited here. The bypass valve 520 is connected to the bypass line 510. The bypass valve 520 can be located at the inlet of the bypass line 510, the outlet of the bypass line 510, or between the inlet and outlet of the bypass line 510. The bypass valve 520 only needs to be able to control the on and off of the bypass line 510. In one embodiment, the bypass valve 520 is further used to control the flow of the refrigerant flowing through the bypass line 510, thereby being able to adjust the flow rate.

[0055] The heat exchange system 10 is provided with a bypass component 500 so that the heat exchange system can have a first operating mode. The heat exchange system includes a control device, which operates the first operating mode when receiving a low-load control signal. That is, in the first operating mode, the control device controls the first indoor heat exchanger 310 to operate and controls the second indoor heat exchanger 320 to stop heat exchange, so that the refrigerant discharged from the first exhaust port 120 of the compressor 100 flows along the first circulation loop, and controls the bypass valve 520 to open so that the bypass pipe 510 connects the second exhaust port 130 and the intake port 110. Among them, in the first operating mode, the first indoor heat exchanger 310 is running and the second indoor heat exchanger 320 stops heat exchange, which means that the first indoor heat exchanger 310 performs heat exchange and the second indoor heat exchanger 320 does not perform heat exchange at all or operates at very low power, wherein the second indoor heat exchanger 320 does not perform heat exchange at all, that is, the refrigerant in the second indoor heat exchanger 320 does not flow, so that the second indoor heat exchanger 320 completely stops heat exchange; or, the second indoor heat exchanger 320 operates at very low power, and the heat exchange efficiency of the second indoor heat exchanger 320 is very low. For example, the ratio of the current operating power of the second indoor heat exchanger 320 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.

[0056] The first indoor heat exchanger 310 is running, and the refrigerant discharged from the compressor 100 flows through the first indoor heat exchanger 310 for heat exchange, and the second indoor heat exchanger 320 stops heat exchange, and the refrigerant discharged from the compressor 100 does not pass through the second indoor heat exchanger 320 for heat exchange. Compared with the first indoor heat exchanger 310 and the second indoor heat exchanger 320 both running, in the first operating mode, the first indoor heat exchanger 310 is running, and the second indoor heat exchanger 320 is not running, and the second indoor heat exchanger 320 stops heat exchange, so that the operating load of the heat exchange system 10 is small, and the heat exchange system 10 is in a low-load operating condition. That is, in the first operating mode, the heat exchange system 10 is in a low-load operating condition.

[0057] In the first operating mode, the refrigerant discharged from the first exhaust port 120 of the compressor 100 flows along the first circulation loop, and the refrigerant flows through the first indoor heat exchanger 310 for heat exchange, and performs cooling or heating to meet the user's heat exchange needs; and, because the bypass valve 520 is open, the bypass pipe 510 is connected to the second exhaust port 130 and the air intake port 110, so that the refrigerant discharged from the second exhaust port 130 of the compressor 100 flows through the bypass pipe 510 and directly returns to the air intake port 110, and the refrigerant does not flow through the second indoor heat exchanger 320 for heat exchange, and the exhaust and The suction pressure is the same and no pressure drop occurs, so that when the refrigerant flows through the compressor 100 for circulation, the energy consumption of the compressor 100 is reduced, and at the same time the heat exchange capacity of the heat exchange system 10 is reduced, so that the overall minimum heating capacity or minimum cooling capacity of the heat exchange system 10 is reduced. That is, by running the first operating mode, the minimum heat exchange capacity of the heat exchange system 10 is reduced, which is equivalent to expanding the range of the minimum heat exchange capacity of the heat exchange system 10, which is beneficial to avoid the increase in energy consumption caused by frequent opening and closing of the compressor 100 during low-frequency operation, thereby improving the energy efficiency of the heat exchange system 10.

[0058] The heat exchange system 10 of the present invention includes a compressor 100, a switching device 200, a first heat exchange device 300, a second heat exchange device 400 and a bypass assembly 500. The first exhaust port 120 of the compressor 100 is connected to the second heat exchange device 400, the first indoor heat exchanger 310 and the air intake port 110 via the switching device 200 to form a first circulation loop. The second exhaust port 130 of the compressor 100 is connected to the second heat exchange device 400, the second indoor heat exchanger 320 and the air intake port 110 via the switching device 200 to form a second circulation loop; the bypass assembly 500 includes a bypass pipe 510 and a bypass valve 520. One end of the bypass pipe 510 is connected to the second exhaust port 130, and the other end of the bypass pipe 510 is connected to the air intake port 110. The bypass valve 520 is arranged on the bypass pipe 510. The bypass valve 520 is used to control the on and off of the bypass pipe 510. Such a configuration enables the heat exchange system 10 to have a first operating mode. The control device of the heat exchange system 10 operates the first operating mode when receiving a low-load control signal. That is, in the first operating mode, the control device controls the first indoor heat exchanger 310 to operate and the second indoor heat exchanger 320 to stop heat exchange, so that the operating load of the heat exchange system 10 is relatively small, and the heat exchange system 10 is in a low-load operating condition. At this time, the refrigerant discharged from the first exhaust port 120 of the compressor 100 flows along the first circulation loop, and the bypass valve 520 is controlled to open, and the bypass pipe 510 connects the second exhaust port 130 and the air intake port 110, so that the high-pressure refrigerant discharged from the second exhaust port 130 of the compressor 100 flows through the bypass pipe 510 and directly flows back to the air intake port 110 of the compressor 100. In this process, the high-pressure refrigerant discharged from the second exhaust port 130 of the compressor 100 does not undergo heat exchange and pressure reduction, and there is no pressure difference between the suction pressure and the exhaust pressure of this part of the refrigerant, which reduces the overall heat exchange and energy consumption of the heat exchange system 10. That is, when the heat exchange system 10 in this solution is in a low-load operating condition, the energy consumption of the heat exchange system 10 is reduced, and the minimum cooling capacity or minimum heating capacity of the heat exchange system 10 is reduced, thereby expanding the range of the minimum heat exchange of the heat exchange system 10, so that the compressor 100 can maintain a low-frequency operation state for a long time when the heat exchange system 10 is in a low-load operating condition, avoiding the increase in energy consumption caused by the frequent opening and closing of the compressor 100 during low-frequency operation, and improving the energy efficiency of the compressor 100 and the heat exchange system 10. It can be seen from this that the heat exchange system 10 of the present application can expand the range of the minimum heat exchange of the heat exchange system 10 when it is in a low-load operating condition, avoid the increase in energy consumption caused by the frequent opening and closing of the compressor 100 during low-frequency operation, and thus improve the energy efficiency of the heat exchange system 10.

[0059] See also Figure 2In one embodiment, the heat exchange system 10 has a first operating mode. In the first operating mode, the first indoor heat exchanger 310 operates, the second indoor heat exchanger 320 does not operate, the second indoor heat exchanger 320 stops exchanging heat, the refrigerant discharged from the first exhaust port 120 of the compressor 100 flows along the first circulation loop, the bypass valve 520 is opened, and the bypass pipe 510 connects the second exhaust port 130 and the intake port 110. With this arrangement, the heat exchange system 10 is in a low-load operating condition. At this time, the refrigerant discharged from the first exhaust port 120 of the compressor 100 flows along the first circulation loop, and the bypass valve 520 is controlled to be open. The bypass pipe 510 is connected to the second exhaust port 130 and the intake port 110, so that the high-pressure refrigerant discharged from the second exhaust port 130 of the compressor 100 flows through the bypass pipe 510 and directly flows back to the intake port 110 of the compressor 100. In this process, this part of the high-pressure refrigerant discharged from the second exhaust port 130 of the compressor 100 does not undergo heat exchange and pressure reduction, and the intake pressure and exhaust pressure of this part of the refrigerant are the same. The absence of pressure difference reduces the overall heat exchange capacity and energy consumption of the heat exchange system 10. That is, when the heat exchange system 10 in this solution is operating at a low load, the energy consumption of the heat exchange system 10 is reduced, and the minimum cooling capacity or minimum heating capacity of the heat exchange system 10 is reduced. This expands the range of the minimum heat exchange capacity of the heat exchange system 10, so that the compressor 100 can maintain a low-frequency operation state for a long time when the heat exchange system 10 is in a low-load operating condition, avoiding the increase in energy consumption caused by frequent opening and closing of the compressor 100 during low-frequency operation, and improving the energy efficiency of the compressor 100 and the heat exchange system 10.

[0060] In one embodiment, the rated power of the heat exchange system 10 is P1, and the current operating power of the heat exchange system 10 is P2. In the first operating mode, the ratio of P2 to P1 is no greater than 0.4. This configuration determines that the heat exchange system 10 is in a low-load operating condition by limiting the ratio of the current operating power to the rated power of the heat exchange system 10, thereby facilitating the control device of the heat exchange system 10 to control the compressor 100, the switching device 200, the first heat exchange device 300, the second heat exchange device 400, and the bypass valve 520, thereby continuously operating in a low-load condition. In the first operating mode, the ratio of P2 to P1 can be 0.1, 0.2, 0.3, 0.4, etc., and is not specifically limited here.

[0061] In one embodiment, in the first operating mode, the compressor 100 operates at a low frequency, and the frequency of the low-frequency operation of the compressor 100 is no greater than 40 Hz. In this configuration, in the first operating mode, the operating frequency of the compressor 100 is low, and accordingly, the operating speed of the motor of the compressor 100 is low, thereby reducing the operating power of the compressor 100, ensuring that the heat exchange system 10 is in a low-load operating condition and that the energy consumption of the compressor 100 is low.

[0062] In the first operating mode, the operating frequency of the compressor 100 may be 40 Hz, 30 Hz, 20 Hz, or 10 Hz, etc., which is not specifically limited here.

[0063] See also Figure 1 In one embodiment, the switching device 200 includes a first reversing valve 210 and a second reversing valve 220, the first reversing valve 210 connecting the air intake port 110, the first exhaust port 120, the second heat exchange device 400 and the first indoor heat exchanger 310; the second reversing valve 220 connecting the air intake port 110, the second exhaust port 130, the second heat exchange device 400 and the second indoor heat exchanger 320; the second reversing valve 220 is connected to the second exhaust port 130 through a first connecting pipe 11, and the second reversing valve 220 is connected to the air intake port 110 through a second connecting pipe 12, one end of the bypass pipe 510 is connected to the first connecting pipe 11, and the other end of the bypass pipe 510 is connected to the second connecting pipe 12.

[0064] It can be understood that by setting the first reversing valve 210, the heat exchange system 10 can conveniently control the refrigerant discharged from the first exhaust port 120 of the compressor 100 to flow along the first circulation loop; by setting the second reversing valve 220, the heat exchange system 10 can conveniently control the refrigerant discharged from the second exhaust port 130 of the compressor 100 to flow along the second circulation loop. The first reversing valve 210 and the second reversing valve 220 separately control the refrigerant flow, which is conducive to reducing the control difficulty and simplifying the structure of the switching device 200.

[0065] In one embodiment, the first reversing valve 210 and the second reversing valve 220 may be composed of multiple valve bodies or may be four-way reversing valves, without limitation. In this embodiment, the first reversing valve 210 comprises a four-way reversing valve; and / or the second reversing valve 220 comprises a four-way reversing valve. The provision of a four-way reversing valve allows for simple and effective switching of refrigerant flow direction, simplifying the structure of the heat exchange system 10 and making it easy to assemble.

[0066] Furthermore, one end of the bypass pipe 510 is connected to the first connecting pipe 11, and the connection between the bypass pipe 510 and the first connecting pipe 11 can be located between the inlet and outlet of the first connecting pipe 11; the other end of the bypass pipe 510 is connected to the second connecting pipe 12, and the connection between the other end of the bypass pipe 510 and the second connecting pipe 12 can be located between the inlet and outlet of the second connecting pipe 12. Such an arrangement is conducive to simplifying the installation method of the bypass pipe 510 and facilitating the quick installation of the bypass pipe 510.

[0067] In one embodiment, the bypass valve 520 is connected in series with the bypass line 510 and is located between the inlet and outlet of the bypass line 510. This arrangement simplifies the installation of the bypass valve 520 and facilitates the bypass valve 520 to precisely control the refrigerant flowing through the bypass line 510. In one embodiment, the bypass valve 520 can be a solenoid valve, specifically a one-way solenoid valve.

[0068] In one embodiment, the bypass valve 520 is connected in series with the first connecting pipe 11, and the bypass valve 520 is located between the inlet and outlet of the first connecting pipe 11, and the bypass valve 520 is connected to the inlet of the bypass line 510. With such an arrangement, the bypass valve 520 can not only control the on-off of the first connecting pipe 11, but also control the on-off of the bypass line 510, and the utilization rate of the bypass valve 520 is high. In this embodiment, the bypass valve 520 is a three-way valve, for example, a three-way solenoid valve, or a proportional three-way valve. When the bypass valve 520 is a proportional three-way valve, the proportional three-way valve can accurately control the flow of the refrigerant flowing through the first connecting pipe 11 and the bypass line 510. The structure of the proportional three-way valve is relatively simple and easy to manufacture, which is conducive to reducing production costs.

[0069] In one embodiment, the bypass valve 520 is connected in series with the second connecting pipe 12, and the bypass valve 520 is located between the inlet and outlet of the second connecting pipe 12, and the bypass valve 520 is connected to the outlet of the bypass line 510. Such an arrangement means that the bypass valve 520 can not only control the on-off of the second connecting pipe 12, but also control the on-off of the bypass line 510, and the utilization rate of the bypass valve 520 is high. In this embodiment, the bypass valve 520 is a three-way valve, for example, a three-way solenoid valve, or a proportional three-way valve. When the bypass valve 520 is a proportional three-way valve, the proportional three-way valve can accurately control the flow of the refrigerant flowing through the second connecting pipe 12 and the bypass line 510. The structure of the proportional three-way valve is relatively simple and easy to manufacture, which is conducive to reducing production costs.

[0070] See also Figure 1In one embodiment, the compressor 100 is a two-cylinder compressor, which includes a casing and a first cylinder 140 and a second cylinder 150 arranged in the casing. The casing is provided with the intake port 110, the first exhaust port 120 and the second exhaust port 130. The exhaust channel of the first cylinder 140 is connected to the first exhaust port 120, and the exhaust channel of the second cylinder 150 is connected to the second exhaust port 130. The volume ratio of the first cylinder 140 to the second cylinder 150 ranges from 0.2 to 5.

[0071] It is understood that the exhaust passage of the first cylinder 140 and the exhaust passage of the second cylinder 150 are independent of each other, and the first cylinder 140 and the second cylinder 150 independently compress gas. In the first operating mode, the refrigerant discharged from the first exhaust port 120 of the compressor 100 flows along the first circulation loop, passes through the first indoor heat exchanger 310 for heat exchange, and finally returns to the exhaust passage of the first cylinder 140 through the intake port 110 for compression. The exhaust pressure and intake pressure of the refrigerant flowing through the exhaust passage of the first cylinder 140 are different. In the first operating mode, because the bypass valve 520 is open, the bypass line 510 connects the second exhaust port 130 and the intake port 110, so that the refrigerant discharged from the second exhaust port 130 of the compressor 100 flows through the bypass line 510 and directly returns to the exhaust passage of the second cylinder 150. The exhaust pressure and intake pressure of the refrigerant flowing through the exhaust passage of the second cylinder 150 are the same. In the first operating mode, the second cylinder 150 does not compress the gas, but only transports the gas. With this configuration, without changing the minimum speed of the compressor 100, the minimum heat exchange capacity of the heat exchange system 10 in the first operating mode depends on the volume ratio of the first cylinder 140 to the second cylinder 150. This solution limits the volume ratio of the first cylinder 140 to the second cylinder 150 to a range of 0.2 to 5, which helps expand the heat exchange range of the heat exchange system 10, that is, expands the minimum heat exchange range of the heat exchange system 10, avoids increased energy consumption caused by frequent opening and closing of the compressor 100 during low-frequency operation, and also helps improve the energy efficiency ratio of the two-cylinder compressor, thereby reducing the power consumption of the two-cylinder compressor and improving the energy efficiency of the heat exchange system 10. The volume ratio of the first cylinder 140 to the second cylinder 150 can be 0.2, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, etc., and is not specifically limited here.

[0072] See also Figure 1In one embodiment, the air intake port 110 includes a first air intake port 111 and a second air intake port 112. The first air intake port 111 and the second air intake port 112 are spaced apart on the housing. The first air intake port 111 is connected to the first circulation loop, and the second air intake port 112 is connected to the second circulation loop. This arrangement allows the first air intake port 111 and the second air intake port 112 to independently return air, and the first cylinder 140 and the second cylinder 150 to independently inhale air without affecting each other. In the first operating mode, there is no pressure difference between the exhaust and intake of the first cylinder 140, and there is no pressure difference between the exhaust and intake of the second cylinder 150. This helps reduce the energy consumption of the compressor 100, allowing the heat exchange system 10 to remain in the first operating mode. The compressor 100 will not reach a shutdown condition due to completing the cooling or heating task in a short period of time, thus avoiding frequent starting and stopping of the compressor 100 and reducing the energy consumption of the compressor 100.

[0073] In one embodiment, in the first operating mode, the exhaust pressure of the second exhaust port 130 is equal to the intake pressure of the second intake port 112. This configuration eliminates the pressure difference between the exhaust and intake of the second cylinder 150, which helps reduce energy consumption of the compressor 100.

[0074] See also Figure 3 In one embodiment, the first heat exchange device 300 includes a first two-pipe indoor unit 301 and a second two-pipe indoor unit 302. The first two-pipe indoor unit 301 has the first indoor heat exchanger 310, and the second two-pipe indoor unit 302 has the second indoor heat exchanger 320. The switching device 200 includes a first reversing valve 210 and a second reversing valve 220. The compressor 100 is connected to the second heat exchange device 400 and the first two-pipe indoor unit 301 via the first reversing valve 210 to form the first circulation loop. The compressor 100 is connected to the second heat exchange device 400 and the second two-pipe indoor unit 302 via the second reversing valve 220 to form the second circulation loop.

[0075] It can be understood that the provision of the first two-pipe indoor unit 301 and the second two-pipe indoor unit 302 simplifies the structure of the first heat exchange device 300 and facilitates installation. Of course, in other embodiments, the first heat exchange device 300 may further include a third two-pipe indoor unit and a fourth two-pipe indoor unit, i.e., the number of two-pipe indoor units is not limited.

[0076] In addition, the number of outdoor heat exchangers in the second heat exchange device 400 is not limited. Figure 2 As shown, the number of outdoor heat exchangers in the second heat exchange device 400 is one; for example, Figure 3As shown, the second heat exchange device 400 includes a first outdoor heat exchanger 410 and a second outdoor heat exchanger 420 , and the number of the outdoor heat exchangers is two.

[0077] See also Figures 4 to 7 In an embodiment of the present invention, the first heat exchange device 300 includes at least one three-pipe indoor unit 303, and the three-pipe indoor unit 303 has the first indoor heat exchanger 310, the second indoor heat exchanger 320, a first interface, a second interface and a third interface. The two ends of the first indoor heat exchanger 310 are respectively connected to the first interface and the third interface, and the two ends of the second indoor heat exchanger 320 are respectively connected to the second interface and the third interface. The three-pipe indoor unit 303 is connected to the switching device 200 through the first interface and the second interface, and the three-pipe indoor unit 303 is connected to the second heat exchange device 400 through the third interface.

[0078] It can be understood that by setting up a three-pipe indoor unit 303, the way in which the first indoor heat exchanger 310 and the second indoor heat exchanger 320 are connected to the second heat exchange device 400 is simple, which is conducive to reducing the number of pipelines, thereby optimizing the pipeline layout of the heat exchange system 10.

[0079] In addition, the number of outdoor heat exchangers in the second heat exchange device 400 is not limited. Figure 5 As shown, the number of outdoor heat exchangers in the second heat exchange device 400 is one; for example, Figure 6 and Figure 7 As shown, the second heat exchange device 400 includes a first outdoor heat exchanger 410 and a second outdoor heat exchanger 420, and the number of outdoor heat exchangers is two. Of course, the heat exchange system 10 can also be provided with different numbers of three-pipe indoor units 303 as needed, such as Figure 5 and Figure 6 As shown, the number of the three-pipe indoor unit 303 in the heat exchange system 10 is one; Figure 7 As shown, the number of the three-pipe indoor units 303 in the heat exchange system 10 is two.

[0080] In one embodiment, the switching device 200 includes a first reversing valve 210 and a second reversing valve 220, and the heat exchange system 10 also includes a first pipeline 13, a second pipeline 14 and a third pipeline 15, one end of the first pipeline 13 is connected to the first interface, and the other end of the first pipeline 13 is connected to the compressor 100 through the first reversing valve 210, one end of the second pipeline 14 is connected to the second interface, and the other end of the second pipeline 14 is connected to the compressor 100 through the second reversing valve 220, one end of the third pipeline 15 is connected to the third interface, and the other end of the third pipeline 15 is connected to the second heat exchange device 400. In this way, the installation of the three-pipe indoor unit 303 in the heat exchange system 10 is realized. The first indoor heat exchanger 310 and the second indoor heat exchanger 320 in the three-pipe indoor unit 303 can have dual evaporation temperatures and evaporation pressures for indoor cooling, and can also have dual condensation temperatures and condensation pressures for indoor heating, which is beneficial to the stepped heat exchange in the first heat exchange device 300, that is, it can realize stepped cooling or stepped heating in the indoor unit, thereby helping to improve the energy efficiency of the heat exchange system 10.

[0081] See also Figures 8 to 10 In the embodiment, the first heat exchange device 300 includes at least one four-pipe indoor unit 304, and the four-pipe indoor unit 304 has the first indoor heat exchanger 310, the second indoor heat exchanger 320, a first connection port, a second connection port, a third connection port and a fourth connection port. The two ends of the first indoor heat exchanger 310 are respectively connected to the first connection port and the second connection port, and the two ends of the second indoor heat exchanger 320 are respectively connected to the third connection port and the fourth connection port. The four-pipe indoor unit 304 is connected to the switching device 200 through the first connection port and the third connection port. The second heat exchange device 400 has a first outdoor heat exchanger 410 and a second outdoor heat exchanger 420. The second connection port is connected to the first outdoor heat exchanger 410, and the fourth connection port is connected to the second outdoor heat exchanger 420.

[0082] It will be appreciated that, compared to the three-pipe indoor unit 303, the four-pipe indoor unit 304 has a different connection method with the second heat exchange device 400. Specifically, the four-pipe indoor unit 304 has a different connection method with the first outdoor heat exchanger 410 and the second outdoor heat exchanger 420. For example, the four-pipe indoor unit 304 is connected to the first outdoor heat exchanger 410 via the second connection port, and the four-pipe indoor unit 304 is connected to the second outdoor heat exchanger 420 via the fourth connection port. The first indoor heat exchanger 310 and the second indoor heat exchanger 320 of the four-pipe indoor unit 304 can flexibly adjust the heat exchange temperature as needed, independently performing cooling or heating, thereby improving installation flexibility and heat exchange efficiency.

[0083] In addition, the heat exchange system 10 can also be provided with different numbers of four-pipe indoor units 304 as needed, for example, Figure 9 As shown, the number of the four-pipe indoor unit 304 in the heat exchange system 10 is one; Figure 10 As shown, the number of the four-pipe indoor units 304 in the heat exchange system 10 is two.

[0084] In one embodiment, the switching device 200 includes the first reversing valve 210 and the second reversing valve 220, and the heat exchange system 10 also includes a first air pipe 16, a second air pipe 17, a first liquid pipe 18 and a second liquid pipe 19, one end of the first air pipe 16 is connected to the first connecting port, the other end of the first air pipe 16 is connected to the compressor 100 through the first reversing valve 210, the second connecting port is connected to the first outdoor heat exchanger 410 through the first liquid pipe 18, one end of the second air pipe 17 is connected to the third connecting port, the other end of the second air pipe 17 is connected to the compressor 100 through the second reversing valve 220, and the fourth connecting port is connected to the second outdoor heat exchanger 420 through the second liquid pipe 19.

[0085] With this arrangement, the first reversing valve 210 and the second reversing valve 220 can regulate the flow direction of the refrigerant in the heat exchange system 10, enabling the heat exchange system 10 to achieve multiple functions. For example, the compressor 100 is connected to the first indoor heat exchanger 310 and the first outdoor heat exchanger 410 via the first reversing valve 210 to form a first circulation loop, and the compressor 100 is connected to the second indoor heat exchanger 320 and the second outdoor heat exchanger 420 via the second reversing valve 220 to form a second circulation loop. The refrigerant flowing through the first circulation loop and / or the second circulation loop can achieve indoor cooling or heating functions.

[0086] See also Figure 1 In one embodiment, the first heat exchange device 300 further includes a first indoor throttle member 330 and a second indoor throttle member 340. The first indoor throttle member 330 is disposed on the first circulation loop, and the second indoor throttle member 340 is disposed on the second circulation loop.

[0087] Specifically, when the first heat exchange device 300 includes a first two-tube indoor unit 301 and a second two-tube indoor unit 302, the first indoor throttling device 330 is arranged in the first two-tube indoor unit 301 and is located on the pipeline connecting the first indoor heat exchanger 310 and the second heat exchange device 400, and the second indoor throttling device 340 is arranged in the second two-tube indoor unit 302 and is located on the pipeline connecting the second indoor heat exchanger 320 and the second heat exchange device 400.

[0088] When the first heat exchange device 300 includes at least one three-pipe indoor unit 303, the first indoor throttling device 330 is arranged on the pipeline connecting the first indoor heat exchanger 310 and the third interface; the second indoor throttling device 340 is arranged on the pipeline connecting the second indoor heat exchanger 320 and the third interface.

[0089] When the first heat exchange device 300 includes at least one four-pipe indoor unit 304, the first indoor throttling device 330 is arranged on the pipeline connecting the first indoor heat exchanger 310 and the second connecting port; the second indoor throttling device 340 is arranged on the pipeline connecting the second indoor heat exchanger 320 and the fourth connecting port.

[0090] It will be understood that the first indoor throttle element 330 is used to throttle the first indoor heat exchanger 310, controlling the flow rate and volume of the refrigerant. When the first indoor heat exchanger 310 is cooling, the first indoor throttle element 330 functions to throttle and reduce pressure; when the first indoor heat exchanger 310 is heating, the first indoor throttle element 330 functions to adjust the degree of subcooling. Similarly, the second indoor throttle element 340 is used to throttle the second indoor heat exchanger 320. The operating principles of the second indoor throttle element 340 are similar to those of the first indoor throttle element 330 and will not be further described here. In addition, both the first indoor throttle element 330 and the second indoor throttle element 340 may be electronic expansion valves.

[0091] In one embodiment, the switching device 200 further includes an outdoor throttling element 230. The number of the outdoor throttling elements 230 can be one, two, or more, and can be specifically set to correspond to the number of outdoor heat exchangers. For example, when there is one outdoor heat exchanger, the number of the outdoor throttling element is also one; when there are two outdoor heat exchangers, the number of the outdoor throttling elements is also two. The outdoor throttling element 230 is used to throttle the outdoor heat exchanger to control the flow rate and flow of the refrigerant, thereby enabling the heat exchange system 10 to have multiple operating modes. The outdoor throttling element 230 can be an electronic expansion valve.

[0092] The present invention also proposes an air conditioner, which includes the heat exchange system 10 as described above. The specific structure of the heat exchange system 10 refers to the above embodiment. Since this air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0093] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat exchange system, characterized in that: The heat exchange system includes a compressor, a switching device, a first heat exchange device, a second heat exchange device, and a bypass assembly; the compressor has an air intake port, a first exhaust port, and a second exhaust port; the first heat exchange device has a first indoor heat exchanger and a second indoor heat exchanger; the first exhaust port of the compressor is connected to the second heat exchange device, the first indoor heat exchanger, and the air intake port via the switching device to form a first circulation loop; the second exhaust port of the compressor is connected to the second heat exchange device, the second indoor heat exchanger, and the air intake port via the switching device to form a second circulation loop; The bypass assembly includes a bypass pipeline and a bypass valve. One end of the bypass pipeline is connected to the second exhaust port, and the other end of the bypass pipeline is connected to the intake port. The bypass valve is arranged on the bypass pipeline and is used to control the on and off of the bypass pipeline.

2. The heat exchange system according to claim 1, wherein: The heat exchange system has a first operating mode. In the first operating mode, the first indoor heat exchanger is in operation, the second indoor heat exchanger stops heat exchange, the refrigerant discharged from the first exhaust port of the compressor flows along the first circulation loop, the bypass valve is opened, and the bypass pipe connects the second exhaust port and the intake port.

3. The heat exchange system according to claim 2, characterized in that: The rated power of the heat exchange system is P1, the current operating power of the heat exchange system is P2, and in the first operating mode, the ratio of P2 to P1 is not greater than 0.

4.

4. The heat exchange system according to claim 2, wherein: In the first operation mode, the compressor operates at a low frequency, and the frequency of the low frequency operation of the compressor is no greater than 40 Hz.

5. The heat exchange system according to claim 1, wherein: The switching device includes a first reversing valve and a second reversing valve, wherein the first reversing valve is connected to the air intake port, the first exhaust port, the second heat exchange device and the first indoor heat exchanger; the second reversing valve is connected to the air intake port, the second exhaust port, the second heat exchange device and the second indoor heat exchanger; The second reversing valve is connected to the second exhaust port through a first connecting pipe, the second reversing valve is connected to the intake port through a second connecting pipe, one end of the bypass line is connected to the first connecting pipe, and the other end of the bypass line is connected to the second connecting pipe.

6. The heat exchange system according to claim 5, characterized in that: The bypass valve is connected in series with the bypass pipeline, and the bypass valve is located between an inlet and an outlet of the bypass pipeline.

7. The heat exchange system according to claim 5, characterized in that: The bypass valve is connected in series with the first connecting pipe, the bypass valve is located between the inlet and the outlet of the first connecting pipe, and the bypass valve is connected to the inlet of the bypass pipeline; Alternatively, the bypass valve is connected in series with the second connecting pipe, the bypass valve is located between the inlet and the outlet of the second connecting pipe, and the bypass valve is connected to the outlet of the bypass pipeline.

8. The heat exchange system according to claim 1, wherein: The compressor is a two-cylinder compressor, which includes a casing and a first cylinder and a second cylinder arranged in the casing. The casing is provided with the intake port, the first exhaust port and the second exhaust port. The exhaust channel of the first cylinder is connected to the first exhaust port, and the exhaust channel of the second cylinder is connected to the second exhaust port. The volume ratio of the first cylinder and the second cylinder ranges from 0.2 to 5.

9. The heat exchange system according to claim 8, characterized in that: The air intake port includes a first air intake port and a second air intake port, the first air intake port and the second air intake port are spaced apart on the casing, the first air intake port is communicated with the first circulation loop, and the second air intake port is communicated with the second circulation loop.

10. The heat exchange system according to any one of claims 1 to 9, characterized in that: The first heat exchange device includes a first two-pipe indoor unit and a second two-pipe indoor unit, the first two-pipe indoor unit has the first indoor heat exchanger, and the second two-pipe indoor unit has the second indoor heat exchanger. The switching device includes a first reversing valve and a second reversing valve. The compressor is connected to the second heat exchange device and the first two-pipe indoor unit via the first reversing valve to form the first circulation loop. The compressor is connected to the second heat exchange device and the second two-pipe indoor unit via the second reversing valve to form the second circulation loop.

11. The heat exchange system according to any one of claims 1 to 9, characterized in that: The first heat exchange device includes at least one three-pipe indoor unit, which has the first indoor heat exchanger, the second indoor heat exchanger, a first interface, a second interface and a third interface. The two ends of the first indoor heat exchanger are respectively connected to the first interface and the third interface, and the two ends of the second indoor heat exchanger are respectively connected to the second interface and the third interface. The three-pipe indoor unit is connected to the switching device through the first interface and the second interface, and the three-pipe indoor unit is connected to the second heat exchange device through the third interface.

12. The heat exchange system according to claim 11, wherein: The switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first pipeline, a second pipeline and a third pipeline. One end of the first pipeline is connected to the first interface, and the other end of the first pipeline is connected to the compressor through the first reversing valve. One end of the second pipeline is connected to the second interface, and the other end of the second pipeline is connected to the compressor through the second reversing valve. One end of the third pipeline is connected to the third interface, and the other end of the third pipeline is connected to the second heat exchange device.

13. The heat exchange system according to any one of claims 1 to 9, characterized in that: The first heat exchange device includes at least one four-pipe indoor unit, the four-pipe indoor unit having the first indoor heat exchanger, the second indoor heat exchanger, a first connection port, a second connection port, a third connection port and a fourth connection port. The two ends of the first indoor heat exchanger are respectively connected to the first connection port and the second connection port, and the two ends of the second indoor heat exchanger are respectively connected to the third connection port and the fourth connection port. The four-pipe indoor unit is connected to the switching device through the first connection port and the third connection port. The second heat exchange device includes a first outdoor heat exchanger and a second outdoor heat exchanger. The second connection port is connected to the first outdoor heat exchanger, and the fourth connection port is connected to the second outdoor heat exchanger.

14. The heat exchange system according to claim 13, wherein: The switching device includes a first reversing valve and a second reversing valve, and the heat exchange system also includes a first air pipe, a second air pipe, a first liquid pipe and a second liquid pipe. One end of the first air pipe is connected to the first connecting port, and the other end of the first air pipe is connected to the compressor through the first reversing valve. The second connecting port is connected to the first outdoor heat exchanger through the first liquid pipe. One end of the second air pipe is connected to the third connecting port, and the other end of the second air pipe is connected to the compressor through the second reversing valve. The fourth connecting port is connected to the second outdoor heat exchanger through the second liquid pipe.

15. An air conditioner, characterized in that: Comprising the heat exchange system according to any one of claims 1 to 14.

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