Air conditioning system

Abstract

The air conditioning system comprises an outdoor unit, an indoor unit and a mode switching unit, the mode switching unit comprises a first manifold, the first manifold is configured to convey a refrigerant discharged by a compressor and is in fluid connection with multiple heat exchangers through multiple paths of high-pressure air pipes, and high-pressure air side valves are arranged on the high-pressure air pipes; the second manifold is configured to guide the refrigerant to flow back to the compressor and is in fluid connection with the multiple heat exchangers through multiple paths of low-pressure air pipes, and low-pressure air side valves are arranged on the low-pressure air pipes; the third manifold is configured to convey the liquid refrigerant and is in fluid connection with the multiple heat exchangers through multiple paths of liquid pipes, and liquid side valves are arranged on the liquid pipes; the bypass pipelines are configured to be in fluid connection with the low-pressure gas pipes and the liquid pipes, the connected low-pressure gas pipes and liquid pipes are in fluid connection with different heat exchangers in the heat exchangers respectively, and bypass valves are arranged on the bypass pipelines; the heat exchangers are arranged in the outdoor unit or the indoor unit; flow path reconstruction of the heat exchanger can be achieved through the mode switching unit according to actual requirements.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to an air conditioning system. Background Technology

[0002] Traditional multi-split air conditioning systems connect outdoor and indoor units only through liquid and gas pipes, with all indoor units sharing the same cooling / heating circulation pipeline. In transitional seasons or in multi-functional buildings, it is difficult to meet the differentiated cooling and heating needs of different areas, leading to energy waste or decreased comfort.

[0003] To overcome the above-mentioned defects and break through the limitations of a single operating mode, multi-split air conditioning systems add a heat recovery pipeline between the indoor and outdoor units on the basis of two-pipe systems to recover excess heat; through a four-way valve and an independent throttling device, the refrigerant flow can be dynamically allocated according to the needs of the indoor units, so as to achieve simultaneous heating and cooling.

[0004] However, in three-pipe air conditioning, the connection between heat exchangers and pipes is fixed, or simply switched by a four-way valve; therefore, the status of each heat exchanger is passively determined by the connected pipes, and cannot be flexibly combined.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0006] This application designs and provides an air conditioning system, including an outdoor unit and an indoor unit. The outdoor unit houses a compressor, and the indoor unit is at least partially located in an air-conditioned room to supply conditioned air to the room. The air conditioning system also includes a mode switching unit. The mode switching unit includes a first manifold, a second manifold, a third manifold, and multiple bypass pipes. The first manifold is configured to transport refrigerant discharged from the compressor and is fluidly connected to multiple heat exchangers via multiple high-pressure gas pipes. High-pressure gas-side valves are installed on the high-pressure gas pipes. The second manifold is configured to guide cooling. The refrigerant flows back to the compressor, which is fluidly connected to multiple heat exchangers through multiple low-pressure gas pipes. Low-pressure gas pipes are equipped with low-pressure gas-side valves. The third manifold is configured to transport liquid refrigerant, which is fluidly connected to multiple heat exchangers through multiple liquid pipes. Liquid pipes are equipped with liquid-side valves. Multiple bypass lines are configured to fluidly connect one low-pressure gas pipe and one liquid pipe. The connected low-pressure gas pipe and liquid pipe are fluidly connected to different heat exchangers among the multiple heat exchangers. Bypass valves are installed on the bypass lines. The multiple heat exchangers are located in the outdoor unit or in the indoor unit.

[0007] The above technical solution has the following advantages or beneficial effects: This application, through a mode switching unit, achieves functional division and dynamic reorganization of the air conditioning system without changing the physical structure of the heat exchanger; it transforms the fixed rigid system of a conventional three-pipe air conditioning system into a mode switching unit based on a matrix-style pipeline and valve element arrangement, thereby forming a fluid control dynamic system. While meeting the multi-functional needs of the user end, it decouples the refrigeration cycle. According to the needs, the heat exchanger can be switched as a cold source, a heat source, or operate in the refrigeration cycle and then disconnect from it. Multiple heat exchangers can operate in series or in parallel. The heat exchangers do not need to work as a whole to maintain efficiency, but can allow some heat exchangers to change their operating mode as needed to complete special working conditions. Each heat exchanger can perform the optimal task of the current air conditioning system.

[0008] In some embodiments of this application, the mode switching unit includes an outdoor mode switching unit, which includes: a first outdoor manifold, a second outdoor manifold, a third outdoor manifold, and multiple outdoor bypass pipelines; the first outdoor manifold includes: multiple outdoor high-pressure gas pipes fluidly connected to multiple outdoor heat exchangers, used to deliver refrigerant discharged from the compressor to the corresponding outdoor heat exchangers, and an outdoor high-pressure gas-side valve is provided on the outdoor high-pressure gas pipes for opening or closing the outdoor high-pressure gas pipes; the second outdoor manifold includes: multiple outdoor low-pressure gas pipes fluidly connected to multiple outdoor heat exchangers, at least used to guide the refrigerant flowing out of the outdoor heat exchangers back to the compressor, and an outdoor low-pressure gas-side valve is provided on the outdoor low-pressure gas pipes for opening or closing the outdoor low-pressure gas pipes; The third outdoor manifold includes: a multi-liquid line that fluidly connects to multiple outdoor heat exchangers and guides the liquid refrigerant condensed in the outdoor heat exchangers; an outdoor liquid-side valve is installed on the liquid line to open or close the liquid line; and a multi-outdoor bypass line configured to fluidly connect one outdoor low-pressure gas line and one outdoor liquid line. The connected outdoor low-pressure gas line and outdoor liquid line are respectively connected to different outdoor heat exchangers. An outdoor bypass valve is installed on the outdoor bypass line to open or close the outdoor bypass line.

[0009] The above technical solution has the following advantages or beneficial effects: through the outdoor mode switching unit, each outdoor heat exchanger can select the refrigerant inlet and outlet according to actual needs, and the outdoor heat exchanger can be used as a condenser or evaporator and form a combination as needed.

[0010] In some embodiments of this application, the mode switching unit includes an indoor mode switching unit, which includes: a first indoor manifold, a second indoor manifold, a third indoor manifold, and multiple indoor bypass lines; the first indoor manifold includes: multiple indoor high-pressure gas pipes fluidly connected to multiple indoor heat exchangers, used to deliver refrigerant discharged from the compressor to the corresponding indoor heat exchangers, and an indoor high-pressure gas-side valve is provided on the indoor high-pressure gas pipes for opening or closing the indoor high-pressure gas pipes; the second indoor manifold includes: multiple indoor low-pressure gas pipes fluidly connected to multiple indoor heat exchangers, at least used to guide the refrigerant flowing out of the indoor heat exchangers back to the compressor, and an indoor low-pressure gas-side valve is provided on the indoor low-pressure gas pipes for opening or closing the indoor low-pressure gas pipes; The third indoor manifold includes: a multi-liquid line that fluidly connects to multiple indoor heat exchangers and is used to guide the liquid refrigerant condensed in the indoor heat exchangers. An indoor liquid-side valve is installed on the liquid line to open or close the liquid line; and a multi-indoor bypass line configured to fluidly connect one indoor low-pressure gas line and one indoor liquid line. The connected indoor low-pressure gas line and indoor liquid line are respectively connected to different indoor heat exchangers. An indoor bypass valve is installed on the indoor bypass line to open or close the indoor bypass line.

[0011] The above technical solution has the following advantages or beneficial effects: Through the indoor mode switching unit, each indoor heat exchanger can select the refrigerant inlet and outlet according to actual needs, and the indoor heat exchanger can be used as a condenser or evaporator and form a combination as needed.

[0012] In some embodiments of this application, the throttling unit includes a plurality of outdoor throttling elements, each fluidly connected to a plurality of outdoor heat exchangers; and a plurality of indoor throttling elements, each fluidly connected to a plurality of indoor heat exchangers.

[0013] The above technical solution has the following advantages or beneficial effects: through the throttling unit, one or more of them can be selected to perform throttling according to the actual working conditions, so that the heat exchanger is in the optimal flow rate and efficiency range.

[0014] In some embodiments of this application, the air conditioning system further includes a processing device, which can be configured to operate an outdoor mode switching unit and an indoor mode switching unit, such that the outdoor high-pressure gas side valve opens multiple outdoor high-pressure gas pipes and the indoor high-pressure gas side valve cuts off multiple indoor high-pressure gas pipes, so as to configure the air conditioning system to operate in cooling mode; or, the outdoor mode switching unit and the indoor mode switching unit can be configured to operate, such that the outdoor high-pressure gas side valve cuts off multiple outdoor high-pressure gas pipes and the indoor high-pressure gas side valve opens multiple indoor high-pressure gas pipes, so as to configure the air conditioning system to operate in heating mode.

[0015] The above technical solution has the following advantages or beneficial effects: Through the processing device, the air conditioning system can be configured as a whole to perform cooling or heating without a four-way valve, avoiding many problems such as reversing failure and refrigerant noise during the reversing process, while reducing the cost and complexity.

[0016] In some embodiments of this application, the air conditioning system further includes a processing device configured to operate an outdoor mode switching unit and an indoor mode switching unit, such that the outdoor high-pressure gas side valve opens one outdoor high-pressure gas pipe, the indoor high-pressure gas side valve cuts off multiple indoor high-pressure gas pipes, and the outdoor bypass valve opens one outdoor bypass pipe, so that the outdoor heat exchanger is connected in series and the air conditioning system is configured to operate in cooling mode.

[0017] In some embodiments of this application, the air conditioning system further includes a processing device configured to operate an outdoor mode switching unit and an indoor mode switching unit, such that an indoor high-pressure gas side valve opens one indoor high-pressure gas pipe, an outdoor high-pressure gas side valve cuts off multiple outdoor high-pressure gas pipes, and an indoor bypass valve opens one indoor bypass pipe, so that indoor heat exchangers are connected in series and the air conditioning system is configured to operate in heating mode.

[0018] The above technical solution has the following advantages or beneficial effects: when used in series, the condenser has fewer flow paths and a higher refrigerant velocity, which enhances heat exchange; at the same time, the evaporator has more flow paths and a slower refrigerant velocity, which reduces pressure loss and thus improves the unit's cooling and heating performance.

[0019] In some embodiments of this application, the air conditioning system further includes a processing device configured to operate an outdoor mode switching unit and an indoor mode switching unit, such that the outdoor high-pressure gas-side valve opens one outdoor high-pressure gas pipe, the indoor high-pressure gas-side valve opens multiple indoor high-pressure gas pipes, the outdoor low-pressure gas-side valve opens one outdoor low-pressure gas pipe, and the indoor low-pressure gas-side valve cuts off multiple indoor low-pressure gas pipes, so that the indoor heat exchanger operates as a condenser, and one of the outdoor heat exchangers operates as a condenser, configuring the air conditioning system to operate in uninterrupted heating mode.

[0020] The above technical solution has the following advantages or beneficial effects: In the uninterrupted heating mode, some outdoor heat exchangers are used as condensers and some are used as evaporators, while the indoor heat exchangers always function as condensers, continuously inputting heat into the room while defrosting to ensure user comfort.

[0021] In some embodiments of this application, the processing device is configured to control the opening degree of the throttling element corresponding to the outdoor heat exchanger operating as an evaporator when executing an uninterrupted mode, such that the difference between the subcooling of the outdoor heat exchanger to be defrosted and the subcooling of the equivalent indoor heat exchanger is negative.

[0022] The above technical solution has the following advantages or beneficial effects: ensuring sufficient refrigerant in the indoor heat exchanger to meet the user's thermal comfort.

[0023] In some embodiments of this application, the air conditioning system further includes a processing device configured to operate an outdoor mode switching unit and an indoor mode switching unit, such that an outdoor high-pressure gas-side valve opens multiple outdoor high-pressure gas pipes, an indoor high-pressure gas-side valve opens a portion of indoor high-pressure gas pipes, an indoor low-pressure gas-side valve opens a portion of indoor low-pressure gas pipes, and an outdoor low-pressure gas-side valve cuts off multiple indoor low-pressure gas pipes, so that some indoor heat exchangers operate as evaporators, some indoor heat exchangers operate as condensers, and the outdoor heat exchanger operates as a condenser.

[0024] The above technical solution has the following advantages or beneficial effects: through modular combination, some indoor heat exchangers can work as evaporators and some indoor heat exchangers can work as condensers.

[0025] In some embodiments of this application, the air conditioning system further includes a processing device configured to operate an outdoor mode switching unit and an indoor mode switching unit, such that the outdoor high-pressure gas-side valve cuts off multiple outdoor high-pressure gas pipes, the indoor high-pressure gas-side valve opens a portion of the indoor high-pressure gas pipes, the outdoor low-pressure gas-side valve opens multiple outdoor low-pressure gas pipes, and the indoor low-pressure gas-side valve opens a portion of the indoor low-pressure gas pipes, so that some indoor heat exchangers operate as evaporators, some indoor heat exchangers operate as condensers, and the outdoor heat exchanger operates as an evaporator.

[0026] By using modular design, some indoor heat exchangers can function as evaporators, while others can function as condensers. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a mode switching unit in an air conditioning system provided in some embodiments of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of an air conditioning system provided in some embodiments of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the outdoor mode switching unit in an air conditioning system provided in some embodiments of the present invention;

[0031] Figure 4This is a schematic diagram of the structure of an indoor mode switching unit in an air conditioning system provided in some embodiments of the present invention;

[0032] Figure 5 This is a schematic diagram of the refrigeration cycle in the refrigeration mode of an air conditioning system provided in some embodiments of the present invention;

[0033] Figure 6 This is a schematic diagram of the refrigeration cycle in the heating mode of an air conditioning system provided in some embodiments of the present invention;

[0034] Figure 7 This is a schematic diagram of the refrigeration cycle of the first variable flow path refrigeration mode of an air conditioning system provided in some embodiments of the present invention;

[0035] Figure 8 This is a schematic diagram of the refrigeration cycle of the second variable flow path refrigeration mode of an air conditioning system provided in some embodiments of the present invention;

[0036] Figure 9 This is a schematic diagram of the cooling cycle of the first variable flow path heating mode of an air conditioning system provided in some embodiments of the present invention;

[0037] Figure 10 This is a schematic diagram of the cooling cycle of the second variable flow path heating mode of an air conditioning system provided in some embodiments of the present invention;

[0038] Figure 11 This is a schematic diagram of the cooling cycle in the first uninterrupted heating mode of an air conditioning system provided in some embodiments of the present invention;

[0039] Figure 12 A schematic diagram of the refrigeration cycle in the second uninterrupted heating mode of an air conditioning system provided in some embodiments of the present invention;

[0040] Figure 13 This is a schematic diagram of the refrigeration cycle in the first simultaneous cooling and heating mode of an air conditioning system provided in some embodiments of the present invention;

[0041] Figure 14 This is a schematic diagram of the refrigeration cycle in the second simultaneous cooling and heating mode of an air conditioning system provided in some embodiments of the present invention;

[0042] Figure 15 This is a schematic diagram of the refrigeration cycle in the third simultaneous cooling and heating mode of an air conditioning system provided in some embodiments of the present invention;

[0043] Figure 16 This is a schematic diagram of the refrigeration cycle in the third simultaneous cooling and heating mode of an air conditioning system provided in some embodiments of the present invention. Detailed Implementation

[0044] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0045] One aspect of this application designs and provides an air conditioning system. From a thermodynamic perspective, the air conditioning system provided by this application uses refrigerant as the working medium and includes an evaporator, a compressor, a condenser, and a throttling device connected in sequence. The refrigeration cycle of the air conditioning system includes a series of processes involving compression, condensation, expansion, and evaporation. Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process. The throttling device causes the high-temperature, high-pressure liquid refrigerant formed in the condenser to expand into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant that has expanded in the throttling device and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material to be cooled.

[0046] In the air conditioning system provided in this application, the outdoor unit includes a compressor. In addition to the compressor, the outdoor unit also includes multiple outdoor heat exchangers. The air conditioning system also includes multiple indoor units, each at least partially located in an air-conditioned room to supply conditioned air to the room; each indoor unit includes one or more indoor heat exchangers.

[0047] like Figure 1 As shown, the air conditioning system provided in this application also includes a mode switching unit 100, which includes:

[0048] The first manifold 101, configured to transport gaseous refrigerant discharged from the compressor, includes a multi-way high-pressure gas line 102. The first manifold 101 is constructed to fluidly connect multiple heat exchangers via the multi-way high-pressure gas line 102. These heat exchangers are located in either an outdoor unit (i.e., an outdoor heat exchanger) or an indoor unit (i.e., an indoor heat exchanger). Each heat exchanger is equipped with a corresponding throttling element, such as an electronic expansion valve, and the two are fluidly connected.

[0049] The second manifold 103 is configured to guide gaseous refrigerant back to the compressor, and includes a multi-way low-pressure gas line 104. The second manifold 103 is configured to connect multiple heat exchangers via the multi-way low-pressure gas line 104.

[0050] The third manifold 105 is configured to transport condensed liquid refrigerant and includes a multi-way liquid line 106. The third manifold 105 is constructed to allow fluid connection of multiple heat exchangers via the multi-way liquid line 106.

[0051] The multi-bypass pipeline 107 is configured to fluidly connect one low-pressure gas pipe 104 and one liquid pipe 106. The low-pressure gas pipe 104 and the liquid pipe 106 are respectively fluidly connected to different heat exchangers among multiple heat exchangers.

[0052] A high-pressure gas-side valve 108 is installed on the high-pressure gas pipe 102, a low-pressure gas-side valve 109 is installed on the low-pressure gas pipe 104, a liquid-side valve 110 is installed on the liquid pipe 106, and a bypass valve 111 is installed on the bypass pipe 107; the high-pressure gas-side valve 108, the low-pressure gas-side valve 109, the liquid-side valve 110, and the bypass valve 111 are independent of each other.

[0053] In this application, the first manifold 101, the second manifold 103, and the third manifold 105 are all branched into multiple branches, which can distribute or collect fluids by branching out from the main pipe.

[0054] The mode switching unit 100 can be housed in a separate housing.

[0055] This application, through a mode switching unit, enables the functional segmentation and dynamic reconfiguration of an air conditioning system without altering the physical structure of the heat exchanger. It transforms a conventional, rigid three-pipe air conditioning system into a mode switching unit based on a matrix-style piping and valve arrangement, thus forming a dynamic fluid control system. This system meets the multi-functional needs of the user while decoupling the refrigeration cycle. Depending on requirements, the heat exchanger can be switched between acting as a cold source, a heat source, operating within the refrigeration cycle, and disconnected from it. Multiple heat exchangers can operate in series or in parallel. The heat exchangers do not need to operate as a single unit to maintain efficiency; instead, some heat exchangers can change their operating modes as needed to handle specific conditions. Each heat exchanger can perform the optimal task for the current air conditioning system.

[0056] In some embodiments of this application, the mode switching unit includes an outdoor mode switching unit.

[0057] The outdoor mode switching unit includes: a first outdoor manifold, a second outdoor manifold, a third outdoor manifold, and multiple outdoor bypass pipelines.

[0058] The first outdoor manifold includes: multiple outdoor high-pressure gas pipes. These multiple outdoor high-pressure gas pipes are fluidly connected to multiple outdoor heat exchangers and are used to deliver refrigerant discharged from the compressor to the corresponding outdoor heat exchangers.

[0059] The second outdoor manifold includes: multiple outdoor low-pressure gas pipes that are fluidly connected to multiple outdoor heat exchangers, and can at least be used to guide the refrigerant flowing out of the outdoor heat exchangers back to the compressor.

[0060] The third outdoor manifold includes a multi-liquid line that connects to multiple outdoor heat exchangers and is used to guide the liquid refrigerant condensed in the outdoor heat exchangers.

[0061] The multi-outdoor bypass pipeline is configured to connect one outdoor low-pressure gas pipe and one outdoor liquid pipe in fluid, and the connected outdoor low-pressure gas pipe and outdoor liquid pipe are respectively connected to different outdoor heat exchangers.

[0062] An outdoor high-pressure gas pipe is equipped with an outdoor high-pressure gas-side valve, which is used to open or close the outdoor high-pressure gas pipe; an outdoor low-pressure gas pipe is equipped with an outdoor low-pressure gas-side valve, which is used to open or close the outdoor low-pressure gas pipe; an outdoor liquid pipe is equipped with an outdoor liquid-side valve, which is used to open or close the liquid pipe; an outdoor bypass pipe is equipped with an outdoor bypass valve, which is used to open or close the outdoor bypass pipe; the outdoor high-pressure gas-side valve, the outdoor low-pressure gas-side valve, the outdoor liquid-side valve, and the outdoor bypass valve are independent of each other.

[0063] In this application, the first outdoor manifold, the second outdoor manifold, and the third outdoor manifold are all branched, with multiple branch pipes branching off from the main pipe, which can distribute or collect fluid. The outdoor mode switching unit can be housed separately in a housing.

[0064] The indoor mode switching unit includes: a first indoor manifold, a second indoor manifold, a third indoor manifold, and multiple indoor bypass lines.

[0065] The first indoor manifold includes: multiple indoor high-pressure gas pipes that are fluidly connected to multiple indoor heat exchangers for delivering refrigerant discharged from the compressor to the corresponding indoor heat exchangers.

[0066] The second indoor manifold includes: multiple indoor low-pressure gas lines that are fluidly connected to multiple indoor heat exchangers, used to guide the refrigerant flowing out of the indoor heat exchangers back to the compressor.

[0067] The third indoor manifold includes a multi-liquid line that fluidly connects to multiple indoor heat exchangers and is used to guide the liquid refrigerant formed by condensation in the indoor heat exchangers.

[0068] The multi-path indoor bypass piping is configured to connect one indoor low-pressure gas pipe and one indoor liquid pipe, with the indoor low-pressure gas pipe and indoor liquid pipe respectively connected to different indoor heat exchangers.

[0069] An indoor high-pressure gas pipe is equipped with an indoor high-pressure gas side valve, which is used to open or close the indoor high-pressure gas pipe; an indoor low-pressure gas pipe is equipped with an indoor low-pressure gas side valve, which is used to open or close the indoor low-pressure gas pipe; an indoor liquid pipe is equipped with an indoor liquid side valve, which is used to open or close the liquid pipe; an indoor bypass pipe is equipped with an indoor bypass valve, which is used to open or close the indoor bypass pipe; the indoor high-pressure gas side valve, indoor low-pressure gas side valve, indoor liquid side valve and indoor bypass valve are independent of each other.

[0070] In this application, the first indoor manifold, the second indoor manifold, and the third indoor manifold are all branched into multiple branches, adopting a structure where multiple branch pipes branch off from the main pipe, which can distribute or collect fluid. The indoor mode switching unit can be set up separately in a housing.

[0071] like Figures 2 to 4 As shown, the air conditioning system includes a first outdoor heat exchanger 3 and a second outdoor heat exchanger 4.

[0072] The first outdoor manifold 201 includes a first outdoor high-pressure gas pipe 202 and a second outdoor high-pressure gas pipe 203. The first outdoor manifold 201 is configured to be fluidly connected to the first outdoor heat exchanger 3 through the first outdoor high-pressure gas pipe 202 and fluidly connected to the second outdoor heat exchanger 4 through the second outdoor high-pressure gas pipe 203. A first outdoor high-pressure gas side valve 15 is provided on the first outdoor high-pressure gas pipe 202 and a second outdoor high-pressure gas side valve 16 is provided on the second outdoor high-pressure gas pipe 203.

[0073] The second outdoor manifold 204 includes a first outdoor low-pressure gas pipe 205 and a second outdoor low-pressure gas pipe 206. The first outdoor gas pipe is configured to be fluidly connected to the first outdoor heat exchanger 3 through the first outdoor low-pressure gas pipe 205 and fluidly connected to the second outdoor heat exchanger 4 through the second outdoor low-pressure gas pipe 206. A first outdoor low-pressure gas side valve 13 is provided on the first outdoor low-pressure gas pipe 205 and a second outdoor low-pressure gas side valve 14 is provided on the second outdoor high-pressure gas pipe 203.

[0074] The third outdoor manifold 207 includes a first outdoor liquid pipe 208 and a second outdoor liquid pipe 209. The third outdoor manifold 207 is configured to be fluidly connected to the first outdoor heat exchanger 3 through the first outdoor liquid pipe 208 and fluidly connected to the second outdoor heat exchanger 4 through the second outdoor liquid pipe 209. A first outdoor liquid-side valve 11 is provided on the first outdoor liquid pipe 208 and a second outdoor liquid-side valve 12 is provided on the second outdoor liquid pipe 209.

[0075] The first outdoor bypass pipeline 210 is configured to fluidly connect the first outdoor low-pressure gas pipeline 205 and the second outdoor liquid pipeline 209. A first outdoor bypass valve 17 is installed on the first outdoor bypass pipeline 210.

[0076] The second outdoor bypass pipeline 211 is configured to fluidly connect the second outdoor low-pressure gas pipeline 206 and the first outdoor liquid pipeline 208. A second outdoor bypass valve 18 is installed on the second outdoor bypass pipeline 211.

[0077] In some embodiments of this application, the air conditioning system includes a first indoor heat exchanger 5 and a second indoor heat exchanger 6.

[0078] The first indoor manifold 301 includes a first indoor high-pressure gas pipe 302 and a second indoor high-pressure gas pipe 303. The first indoor manifold 301 is configured to be fluidly connected to the first indoor heat exchanger 5 through the first indoor high-pressure gas pipe 302 and fluidly connected to the second indoor heat exchanger 6 through the second indoor high-pressure gas pipe 303. A first indoor high-pressure gas side valve 23 is provided on the first indoor high-pressure gas pipe 302 and a second indoor high-pressure gas side valve 24 is provided on the second indoor high-pressure gas pipe 303.

[0079] The second indoor manifold 304 includes a first indoor low-pressure gas pipe 305 and a second indoor low-pressure gas pipe 306. The first indoor gas pipe is configured to be fluidly connected to the first indoor heat exchanger 5 through the first indoor low-pressure gas pipe 305 and fluidly connected to the second indoor heat exchanger 6 through the second indoor low-pressure gas pipe 306. A first indoor low-pressure gas side valve 21 is provided on the first indoor low-pressure gas pipe 305 and a second indoor low-pressure gas side valve 22 is provided on the second indoor high-pressure gas pipe 303.

[0080] The third indoor manifold 307 includes a first indoor liquid pipe 308 and a second indoor liquid pipe 309. The third indoor manifold 307 is configured to be fluidly connected to the first indoor heat exchanger 5 through the first indoor liquid pipe 308 and fluidly connected to the second indoor heat exchanger 6 through the second indoor liquid pipe 309. A first indoor liquid-side valve 19 is provided on the first indoor liquid pipe 308 and a second indoor liquid-side valve 20 is provided on the second indoor liquid pipe 309.

[0081] The first indoor bypass line 310 is configured to fluidly connect the first indoor low-pressure gas line 305 and the second indoor liquid line 309. The first indoor bypass line 310 is equipped with a first indoor bypass valve 25.

[0082] The second indoor bypass line 311 is configured to fluidly connect the second indoor low-pressure gas line 306 and the first indoor liquid line 308. A second indoor bypass valve 26 is installed on the second indoor bypass line 311.

[0083] In some embodiments of this application, the air conditioning system further includes a throttling unit, which includes a first outdoor throttling element 7, a second outdoor throttling element 8, a first indoor throttling element 9, and a second indoor throttling element 10. The first outdoor throttling element 7 is fluidly connected to the first outdoor heat exchanger 3, the second outdoor throttling element 8 is fluidly connected to the second outdoor heat exchanger 4, the first indoor throttling element 9 is fluidly connected to the first indoor heat exchanger 5, and the second indoor throttling element 10 is fluidly connected to the second indoor heat exchanger 6.

[0084] The air conditioning system also includes a processing unit (not shown). This processing unit monitors and regulates the operating status of the air conditioning system to ensure its efficient, stable, and safe operation. The processing unit includes components such as a processor, volatile memory, non-volatile memory, display components, operating components, communication interfaces, and drive components, all interconnected via a bus.

[0085] In some embodiments of this application, the first outdoor liquid-side valve 11, the second outdoor liquid-side valve 12, the first outdoor low-pressure gas-side valve 13, the second outdoor low-pressure gas-side valve 14, the first outdoor high-pressure gas-side valve 15, the second outdoor high-pressure gas-side valve 16, the first outdoor bypass valve 17, the second outdoor bypass valve 18, the first indoor liquid-side valve 19, the second indoor liquid-side valve 20, the first indoor low-pressure gas-side valve 21, the second indoor low-pressure gas-side valve 22, the first indoor high-pressure gas-side valve 23, the second indoor high-pressure gas-side valve 24, the first indoor bypass valve 25, and the second indoor bypass valve are solenoid valves 26, or all of them are electronic expansion valves, or some are solenoid valves and some are electronic expansion valves.

[0086] In some embodiments of this application, the processing device may be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, such that the outdoor high-pressure gas side valve opens multiple outdoor high-pressure gas pipes and the indoor high-pressure gas side valve cuts off multiple indoor high-pressure gas pipes, so as to configure the air conditioning system to operate in the cooling mode.

[0087] Specifically, such as Figure 5 As shown, the processing device is configured as follows:

[0088] The first outdoor throttling element 7 is in the fully open operating range, the second outdoor throttling element 8 is in the fully open operating range, the first indoor throttling element 9 is in the throttling operating range, and the second indoor throttling element 10 is in the throttling operating range.

[0089] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the closed state, the second outdoor low-pressure gas-side valve 14 is in the closed state, the first outdoor high-pressure gas-side valve 15 is in the open state, the second outdoor high-pressure gas-side valve 16 is in the open state, the first outdoor bypass valve 17 is in the closed state, and the second outdoor bypass valve 18 is in the closed state.

[0090] The first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the open state, the second indoor low-pressure gas-side valve 22 is in the open state, the first indoor high-pressure gas-side valve 23 is in the closed state, the second indoor high-pressure gas-side valve 24 is in the closed state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0091] Guided by the first outdoor manifold 201, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 2 is divided into two streams. One stream flows through the first outdoor high-pressure gas-side valve 15 into the first outdoor heat exchanger 3, where it condenses to form a high-pressure, medium-temperature refrigerant that flows into the first outdoor throttling element 7 and the first outdoor liquid-side valve 11. The other stream flows through the second outdoor high-pressure gas-side valve 16 into the second outdoor heat exchanger 4, where it condenses to form a high-pressure, medium-temperature refrigerant that flows into the second outdoor throttling element 8 and the second outdoor liquid-side valve 12. Guided by the third outdoor manifold 207, the two high-pressure, medium-temperature refrigerants merge and flow into the indoor mode switching unit 28.

[0092] Guided by the third indoor manifold 307, the high-pressure medium-temperature refrigerant entering the indoor mode switching unit 28 is divided into two paths. One path flows through the first indoor liquid-side valve 19 and the first indoor throttling element 9, where the low-temperature, low-pressure liquid refrigerant formed by throttling flows into the first indoor heat exchanger 5, and the low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the first indoor low-pressure gas-side valve 21. The other path flows through the second indoor liquid-side valve 20 and the second indoor throttling element 10, where the low-temperature, low-pressure liquid refrigerant formed by throttling flows into the second indoor heat exchanger 6, and the low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the second indoor low-pressure gas-side valve 22. Guided by the second indoor manifold 304, the two refrigerant paths merge and flow into the gas-liquid separator 1, returning to the compressor 2.

[0093] In some other embodiments of this application, the processing device may be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, such that the outdoor high-pressure gas side valve cuts off multiple outdoor high-pressure gas pipes and the indoor high-pressure gas side valve opens multiple indoor high-pressure gas pipes, so as to configure the air conditioning system to operate in heating mode.

[0094] Specifically, such as Figure 6 As shown, the processing device is configured as follows:

[0095] The first outdoor throttling element 7 is in the throttling operating range, the second outdoor throttling element 8 is in the throttling operating range, the first indoor throttling element 9 is in the fully open operating range, and the second indoor throttling element 10 is in the fully open operating range.

[0096] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the open state, the second outdoor low-pressure gas-side valve 14 is in the open state, the first outdoor high-pressure gas-side valve 15 is in the closed state, the second outdoor high-pressure gas-side valve 16 is in the closed state, the first outdoor bypass valve 17 is in the closed state, and the second outdoor bypass valve 18 is in the closed state.

[0097] The first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the closed state, the second indoor low-pressure gas-side valve 22 is in the closed state, the first indoor high-pressure gas-side valve 23 is in the open state, the second indoor high-pressure gas-side valve 24 is in the open state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0098] Guided by the first indoor manifold 301, the high-temperature, high-pressure refrigerant discharged from the compressor 2 is divided into two paths. One path flows through the first indoor high-pressure gas-side valve 23 into the first indoor heat exchanger 5, where the high-pressure, medium-temperature refrigerant formed by condensation flows into the first indoor throttling element 9 and the first indoor liquid-side valve 19. The other path flows through the second indoor high-pressure gas-side valve 24 into the second indoor heat exchanger 6, where the high-pressure, medium-temperature refrigerant formed by condensation flows into the second indoor throttling element 10 and the second indoor liquid-side valve 20. Guided by the third indoor manifold 307, the two high-pressure, medium-temperature refrigerants merge and flow into the outdoor mode switching unit 27.

[0099] Guided by the third outdoor manifold 207, the high-pressure medium-temperature refrigerant entering the outdoor mode switching unit 27 is divided into two paths. One path flows through the first outdoor liquid-side valve 11 and the first outdoor throttling element 7, where the low-temperature, low-pressure liquid refrigerant formed by throttling flows into the first outdoor heat exchanger 3, and the low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the first outdoor low-pressure gas-side valve 13. The other path flows through the second outdoor liquid-side valve 12 and the second outdoor throttling element 8, where the low-temperature, low-pressure liquid refrigerant formed by throttling flows into the second outdoor heat exchanger 4, and the low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the second outdoor low-pressure gas-side valve 14. Guided by the second outdoor manifold 204, the two refrigerant paths merge and flow into the gas-liquid separator 1, returning to the compressor 2.

[0100] In some other embodiments of this application, the processing device may be configured to operate an outdoor mode switching unit 27 and an indoor mode switching unit 28, such that the outdoor high-pressure gas side valve opens one outdoor high-pressure gas pipe, the indoor high-pressure gas side valve cuts off multiple indoor high-pressure gas pipes, and the outdoor bypass valve opens one outdoor bypass pipe, so that the outdoor heat exchanger is connected in series and the air conditioning system is configured to operate in cooling mode.

[0101] like Figure 7 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, in conjunction with the throttling unit, enable the air conditioning system to operate in the first variable flow path cooling mode.

[0102] The first outdoor throttling element 7 is in the fully open operating range, the second outdoor throttling element 8 is in the fully open operating range, the first indoor throttling element 9 is in the throttling operating range, and the second indoor throttling element 10 is in the throttling operating range.

[0103] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the closed state, the first outdoor low-pressure gas-side valve 13 is in the closed state, the second outdoor low-pressure gas-side valve 14 is in the closed state, the first outdoor high-pressure gas-side valve 15 is in the closed state, the second outdoor high-pressure gas-side valve 16 is in the open state, the first outdoor bypass valve 17 is in the open state, the second outdoor bypass valve 18 is in the closed state, the first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the open state, the second indoor low-pressure gas-side valve 22 is in the open state, the first indoor high-pressure gas-side valve 23 is in the closed state, the second indoor high-pressure gas-side valve 24 is in the closed state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0104] Guided by the first outdoor manifold 201, the high-temperature and high-pressure refrigerant discharged by the compressor 2 flows into the second outdoor heat exchanger 4 through the second outdoor high-pressure gas-side valve 16. The high-pressure medium-temperature refrigerant formed by condensation flows into the first outdoor heat exchanger 3 through the second outdoor throttling element 8 and the first outdoor bypass valve 17. The high-pressure low-temperature refrigerant formed by condensation flows into the first outdoor throttling element 7 and the first outdoor liquid-side valve 11, and then into the indoor mode switching unit 28.

[0105] Guided by the third indoor manifold 307, the refrigerant flowing into the indoor mode switching unit 28 is divided into two paths. One path flows through the first indoor liquid-side valve 19 and the first indoor throttling element 9, forming a low-temperature, low-pressure liquid refrigerant that flows into the first indoor heat exchanger 5. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the first indoor low-pressure gas-side valve 21, guided by the second indoor manifold 304. The other path flows through the second indoor liquid-side valve 20 and the second indoor throttling element 10, forming a low-temperature, low-pressure liquid refrigerant that flows into the second indoor heat exchanger 6. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the second indoor low-pressure gas-side valve 22, guided by the second indoor manifold 304. After the two refrigerant paths merge, they flow into the gas-liquid separator 1 and return to the compressor 2.

[0106] In this embodiment, in the cooling mode, the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are connected in series, which reduces the number of flow paths, increases the flow velocity, and enhances the heat exchange performance. The first indoor heat exchanger 5 and the second indoor heat exchanger 6 are connected in parallel, which increases the number of flow paths, reduces the flow velocity, and reduces the pressure loss.

[0107] like Figure 8 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, in conjunction with the throttling unit, enable the air conditioning system to operate in the second variable flow path cooling mode.

[0108] The first outdoor throttling element 7 is in the fully open operating range, the second outdoor throttling element 8 is in the fully open operating range, the first indoor throttling element 9 is in the throttling operating range, and the second indoor throttling element 10 is in the throttling operating range.

[0109] The first outdoor liquid-side valve 11 is in the off state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the off state, the second outdoor low-pressure gas-side valve 14 is in the off state, the first outdoor high-pressure gas-side valve 15 is in the open state, the second outdoor high-pressure gas-side valve 16 is in the off state, the first outdoor bypass valve 17 is in the off state, the second outdoor bypass valve 18 is in the open state, the first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the open state, the second indoor low-pressure gas-side valve 22 is in the open state, the first indoor high-pressure gas-side valve 23 is in the off state, the second indoor high-pressure gas-side valve 24 is in the off state, the first indoor bypass valve 25 is in the off state, and the second indoor bypass valve 26 is in the off state.

[0110] Guided by the first outdoor manifold 201, the high-temperature and high-pressure refrigerant discharged by the compressor 2 flows into the first outdoor heat exchanger 3 through the first outdoor high-pressure gas-side valve 15. The high-pressure medium-temperature refrigerant formed by condensation flows into the second outdoor heat exchanger 4 through the first outdoor throttling element 7 and the second outdoor bypass valve 18. The high-pressure low-temperature refrigerant formed by condensation flows into the second outdoor throttling element 8 and the second outdoor liquid-side valve 12, and then into the indoor mode switching unit 28.

[0111] Guided by the third indoor manifold 307, the refrigerant flowing into the indoor mode switching unit 28 is divided into two paths. One path flows through the first indoor liquid-side valve 19 and the first indoor throttling element 9, forming a low-temperature, low-pressure liquid refrigerant that flows into the first indoor heat exchanger 5. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the first indoor low-pressure gas-side valve 21, guided by the second indoor manifold 304. The other path flows through the second indoor liquid-side valve 20 and the second indoor throttling element 10, forming a low-temperature, low-pressure liquid refrigerant that flows into the second indoor heat exchanger 6. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the second indoor low-pressure gas-side valve 22, guided by the second indoor manifold 304. After the two refrigerant paths merge, they flow into the gas-liquid separator 1 and return to the compressor 2.

[0112] In this embodiment, in the cooling mode, the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are connected in series, which reduces the number of flow paths, increases the flow velocity, and enhances the heat exchange performance. The first indoor heat exchanger 5 and the second indoor heat exchanger 6 are connected in parallel, which increases the number of flow paths, reduces the flow velocity, and reduces the pressure loss.

[0113] In other embodiments of this application, the processing device may be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, such that the indoor high-pressure gas side valve opens one indoor high-pressure gas pipe, the outdoor high-pressure gas side valve cuts off multiple outdoor high-pressure gas pipes, and the indoor bypass valve opens one indoor bypass pipe, so that the indoor heat exchangers are connected in series and the air conditioning system is configured to operate in heating mode.

[0114] like Figure 9 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, in conjunction with the throttling unit, enable the air conditioning system to operate in the first variable flow path heating mode.

[0115] The first outdoor throttling element 7 is in the throttling operating range, the second outdoor throttling element 8 is in the throttling operating range, the first indoor throttling element 9 is in the fully open operating range, and the second indoor throttling element 10 is in the fully open operating range.

[0116] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the open state, the second outdoor low-pressure gas-side valve 14 is in the open state, the first outdoor high-pressure gas-side valve 15 is in the closed state, the second outdoor high-pressure gas-side valve 16 is in the closed state, the first outdoor bypass valve 17 is in the closed state, the second outdoor bypass valve 18 is in the closed state, the first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the closed state, the first indoor low-pressure gas-side valve 21 is in the closed state, the second indoor low-pressure gas-side valve 22 is in the closed state, the first indoor high-pressure gas-side valve 23 is in the closed state, the second indoor high-pressure gas-side valve 24 is in the open state, the first indoor bypass valve 25 is in the open state, and the second indoor bypass valve 26 is in the closed state.

[0117] Guided by the first indoor manifold 301, the high-temperature and high-pressure refrigerant discharged by the compressor 2 flows into the second indoor heat exchanger 6 through the second indoor high-pressure gas-side valve 24, and forms a high-pressure medium-temperature refrigerant through condensation. The high-pressure medium-temperature refrigerant formed by condensation flows into the first indoor heat exchanger 5 through the second indoor throttling element 10 and the first indoor bypass valve 25, and forms a high-pressure low-temperature refrigerant through condensation. It then flows into the first indoor throttling element 9 and the first indoor liquid-side valve 19, and flows into the outdoor mode switching unit 27 under the guidance of the third indoor manifold 307.

[0118] The refrigerant flowing into the indoor mode switching unit 28 is divided into two paths under the guidance of the third outdoor manifold 207. One path passes through the first outdoor liquid-side valve 11 and the first outdoor throttling element 7; the low-temperature, low-pressure liquid refrigerant formed by throttling flows into the first outdoor heat exchanger 3, and the low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the first outdoor low-pressure gas-side valve 13 under the guidance of the second outdoor manifold 204. The other path passes through the second outdoor liquid-side valve 12 and the second outdoor throttling element 8; the low-temperature, low-pressure liquid refrigerant formed by throttling flows into the second outdoor heat exchanger 4, and the low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the second outdoor low-pressure gas-side valve 14 under the guidance of the second outdoor manifold 204. After the two refrigerant paths merge, they flow into the gas-liquid separator 1 and return to the compressor 2.

[0119] The air conditioning system provided in this embodiment can achieve the following in heating mode: the first indoor heat exchanger 5 and the second indoor heat exchanger 6 are connected in series, the number of flow paths is reduced, the flow velocity is increased, and the heat exchange performance is enhanced; the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are connected in parallel, the number of flow paths is increased, the flow velocity is reduced, and the pressure loss is reduced.

[0120] like Figure 10 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, in conjunction with the throttling unit, enable the air conditioning system to operate in the second variable flow path heating mode.

[0121] The first outdoor throttling element 7 is in the throttling operating range, the second outdoor throttling element 8 is in the throttling operating range, the first indoor throttling element 9 is in the fully open operating range, and the second indoor throttling element 10 is in the fully open operating range.

[0122] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the open state, the second outdoor low-pressure gas-side valve 14 is in the open state, the first outdoor high-pressure gas-side valve 15 is in the closed state, the second outdoor high-pressure gas-side valve 16 is in the closed state, the first outdoor bypass valve 17 is in the closed state, the second outdoor bypass valve 18 is in the closed state, the first indoor liquid-side valve 19 is in the closed state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the closed state, the second indoor low-pressure gas-side valve 22 is in the closed state, the first indoor high-pressure gas-side valve 23 is in the open state, the second indoor high-pressure gas-side valve 24 is in the closed state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the open state.

[0123] Guided by the first indoor manifold 301, the high-temperature and high-pressure refrigerant discharged by the compressor 2 flows into the first indoor heat exchanger 5 through the first indoor high-pressure gas-side valve 23, and forms a high-pressure medium-temperature refrigerant through condensation. The high-pressure medium-temperature refrigerant formed by condensation flows into the second indoor heat exchanger 6 through the first indoor throttling element 9 and the second indoor bypass valve 26, and forms a high-pressure low-temperature refrigerant through condensation. It then flows into the second indoor throttling element 10 and the second indoor liquid-side valve 20, and flows into the outdoor mode switching unit 27 under the guidance of the third indoor manifold 307.

[0124] The refrigerant flowing into the indoor mode switching unit 28 is divided into two paths under the guidance of the third outdoor manifold 207. One path passes through the first outdoor liquid-side valve 11 and the first outdoor throttling element 7; the low-temperature, low-pressure liquid refrigerant formed by throttling flows into the first outdoor heat exchanger 3, and the low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the first outdoor low-pressure gas-side valve 13 under the guidance of the second outdoor manifold 204. The other path passes through the second outdoor liquid-side valve 12 and the second outdoor throttling element 8; the low-temperature, low-pressure liquid refrigerant formed by throttling flows into the second outdoor heat exchanger 4, and the low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the second outdoor low-pressure gas-side valve 14 under the guidance of the second outdoor manifold 204. After the two refrigerant paths merge, they flow into the gas-liquid separator 1 and return to the compressor 2.

[0125] In the air conditioning system provided in this embodiment, the first indoor heat exchanger 5 and the second indoor heat exchanger 6 are connected in series, which reduces the number of flow paths, increases the flow velocity, and enhances the heat exchange performance. The first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are connected in parallel, which increases the number of flow paths, reduces the flow velocity, and reduces the pressure loss.

[0126] In some embodiments of this application, the processing device may be configured to operate an outdoor mode switching unit 27 and an indoor mode switching unit 28, such that the outdoor high-pressure gas-side valve opens one outdoor high-pressure gas pipe, the indoor high-pressure gas-side valve opens multiple indoor high-pressure gas pipes, the outdoor low-pressure gas-side valve opens one outdoor low-pressure gas pipe, and the indoor low-pressure gas-side valve cuts off multiple indoor low-pressure gas pipes, so that the indoor heat exchanger operates as a condenser, one of the outdoor heat exchangers operates as a condenser, and the air conditioning system is configured to operate in uninterrupted heating mode.

[0127] like Figure 11 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, in conjunction with the throttling unit, enable the air conditioning system to operate in the first uninterrupted heating mode.

[0128] The first outdoor throttling element 7 is in the throttling operating range, the second outdoor throttling element 8 is in the fully open operating range, the first indoor throttling element 9 is in the fully open operating range, and the second indoor throttling element 10 is in the fully open operating range.

[0129] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the open state, the second outdoor low-pressure gas-side valve 14 is in the closed state, the first outdoor high-pressure gas-side valve 15 is in the closed state, the second outdoor high-pressure gas-side valve 16 is in the open state, the first outdoor bypass valve 17 is in the closed state, the second outdoor bypass valve 18 is in the closed state, the first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the closed state, the second indoor low-pressure gas-side valve 22 is in the closed state, the first indoor high-pressure gas-side valve 23 is in the open state, the second indoor high-pressure gas-side valve 24 is in the open state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0130] Guided by the first outdoor manifold 201 and the first indoor manifold 301, the high-temperature, high-pressure refrigerant discharged from the compressor 2 is divided into three paths. The first path flows into the first indoor heat exchanger 5 via the first indoor high-pressure gas-side valve 23. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the first indoor throttling element 9 and the first indoor liquid-side valve 19, guided by the third indoor manifold 307. The second path flows into the second indoor heat exchanger 6 via the second indoor high-pressure gas-side valve 24. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the second indoor throttling element 10 and the second indoor liquid-side valve 20, guided by the third indoor manifold 307. The third path flows into the second outdoor heat exchanger 4 via the second outdoor high-pressure gas-side valve 16. The high-pressure, low-temperature refrigerant formed by condensation flows out through the second outdoor throttling element 8 and the second outdoor liquid-side valve 12, guided by the third outdoor manifold 207.

[0131] After the three refrigerants are combined, under the guidance of the third outdoor manifold 207, they are throttled into low-temperature, low-pressure liquid refrigerant through the first outdoor liquid-side valve 11 and the first outdoor throttling element 7, and flow into the first outdoor heat exchanger 3. The low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the first outdoor low-pressure gas-side valve 13 under the guidance of the second outdoor manifold 204, flows into the gas-liquid separator 1, and returns to the compressor 2.

[0132] In this embodiment, the air conditioning system can enable the first outdoor heat exchanger 3 to work as an evaporator, and the second outdoor heat exchanger 4, the first indoor heat exchanger 5, and the second indoor heat exchanger 6 to work as condensers. While the second outdoor heat exchanger 4 is defrosting, the two indoor heat exchangers provide uninterrupted heating.

[0133] like Figure 12 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, in conjunction with the throttling unit, enable the air conditioning system to operate in the second uninterrupted heating mode.

[0134] The first outdoor throttling element 7 is in the fully open operating range, the second outdoor throttling element 8 is in the throttling operating range, the first indoor throttling element 9 is in the fully open operating range, and the second indoor throttling element 10 is in the fully open operating range.

[0135] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the closed state, the second outdoor low-pressure gas-side valve 14 is in the open state, the first outdoor high-pressure gas-side valve 15 is in the open state, the second outdoor high-pressure gas-side valve 16 is in the closed state, the first outdoor bypass valve 17 is in the closed state, the second outdoor bypass valve 18 is in the closed state, the first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the closed state, the second indoor low-pressure gas-side valve 22 is in the closed state, the first indoor high-pressure gas-side valve 23 is in the open state, the second indoor high-pressure gas-side valve 24 is in the open state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0136] Guided by the first outdoor manifold 201 and the first indoor manifold 301, the high-temperature, high-pressure refrigerant discharged from the compressor 2 is divided into three paths. The first path flows into the first indoor heat exchanger 5 via the first indoor high-pressure gas-side valve 23. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the first indoor throttling element 9 and the first indoor liquid-side valve 19, guided by the third indoor manifold 307. The second path flows into the second indoor heat exchanger 6 via the second indoor high-pressure gas-side valve 24. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the second indoor throttling element 10 and the second indoor liquid-side valve 20, guided by the third indoor manifold 307. The third path flows into the first outdoor heat exchanger 3 via the first outdoor high-pressure gas-side valve 15. The high-pressure, low-temperature refrigerant formed by condensation flows out through the first outdoor throttling element 7 and the first outdoor liquid-side valve 11, guided by the third outdoor manifold 207.

[0137] After the three refrigerants are combined, under the guidance of the third outdoor manifold 207, they are throttled into low-temperature, low-pressure liquid refrigerant through the second outdoor liquid-side valve 12 and the second outdoor throttling element 8, and flow into the second outdoor heat exchanger 4. The low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the second outdoor low-pressure gas-side valve 14 under the guidance of the second outdoor manifold 204, flows into the gas-liquid separator 1, and returns to the compressor 2.

[0138] In this embodiment, the air conditioning system can enable the second outdoor heat exchanger 4 to work as an evaporator, and the first outdoor heat exchanger 3, the first indoor heat exchanger 5, and the second indoor heat exchanger 6 to work as condensers. While the first outdoor heat exchanger 3 is defrosting, the two indoor heat exchangers provide uninterrupted heating.

[0139] The processing unit is configured to control the opening of the throttling element corresponding to the outdoor heat exchanger that operates as an evaporator when executing uninterrupted mode, so that the difference between the subcooling of the outdoor heat exchanger to be defrosted and the subcooling of the equivalent indoor heat exchanger is negative.

[0140] The processing device is configured to perform the following steps:

[0141] Sample the detected value from the first temperature sensor. The first temperature sensor is located on the liquid side of the first outdoor heat exchanger.

[0142] Sample the detected value from the second temperature sensor. The second temperature sensor is located on the liquid side of the second outdoor heat exchanger.

[0143] The detected value of the suction side pressure sensor of the sampling compressor. .

[0144] Set target defrost temperature Target defrosting temperature satisfy ,in, For ambient temperature, and The correction coefficients were obtained in an experimental environment, pre-stored, and can be recalled at any time.

[0145] Set target defrost pressure Target defrosting pressure satisfy ,in, For ambient temperature, and The correction coefficients were obtained in an experimental environment, pre-stored, and can be recalled at any time.

[0146] Determine the detected value of the first temperature sensor. The detected value of the second temperature sensor The detected value of the compressor suction side pressure sensor Does it meet the preset conditions for uninterrupted defrosting?

[0147] For example, the detected value of the first temperature sensor The detected value of the second temperature sensor At least one of them is below the target defrost temperature. And the detected value of the compressor suction side pressure sensor Below target defrost pressure And when the preset time is reached, it is determined to be the detection value of the first temperature sensor. The detected value of the second temperature sensor The detected value of the compressor suction side pressure sensor Meets the preset conditions for uninterrupted defrosting;

[0148] Compare the detected values ​​of the first temperature sensor The detection value of the second temperature sensor Choose to execute either the first uninterrupted heating mode or the second uninterrupted heating mode.

[0149] For example, the detected value of the first temperature sensor Higher than the detection value of the second temperature sensor At that time, the second uninterrupted heating mode is executed; based on the detection value of the first temperature sensor. Lower than the detection value of the second temperature sensor At that time, the first uninterrupted heating mode is executed.

[0150] When executing the first uninterrupted heating mode, the processing unit is configured to control the opening degree of the first outdoor throttling element within the throttling operating range, such that the difference between the subcooling of the second outdoor heat exchanger and the equivalent indoor heat exchanger is negative; wherein, the subcooling of the second outdoor heat exchanger is denoted as... , satisfy , This is the saturation temperature corresponding to the compressor's discharge pressure.

[0151] When executing the second uninterrupted heating mode, the processing unit is configured to control the opening degree of the second outdoor throttling element within the throttling operating range, such that the difference between the subcooling of the first outdoor heat exchanger and the equivalent indoor heat exchanger is negative; wherein, the subcooling of the first outdoor heat exchanger is denoted as... , satisfy , This is the saturation temperature corresponding to the compressor's discharge pressure.

[0152] In some embodiments of this application, the equivalent subcooling of the indoor heat exchanger is the smaller of the subcooling of the first indoor heat exchanger and the subcooling of the second indoor heat exchanger. ,in, , ; The temperature of the liquid tube in the first indoor heat exchanger. This is the liquid tube temperature of the second indoor heat exchanger, so that even the lowest level of indoor heat exchanger can reach a basic subcooling level, and all indoor heat exchangers can operate normally.

[0153] In some other embodiments of this application, the equivalent subcooling of the indoor heat exchanger is the average of the subcooling of the first indoor heat exchanger and the subcooling of the second indoor heat exchanger.

[0154] Assume there is or , Then, when executing the first uninterrupted heating mode or the second uninterrupted heating mode, there is .

[0155] In this embodiment, by precisely adjusting the refrigerant distribution, the difference in subcooling between the indoor heat exchanger to be defrosted and the real-time indoor heat exchanger is maintained as a negative number, so that the energy used for defrosting and the energy used for indoor heating are balanced. Since the subcooling of the outdoor heat exchanger to be defrosted (the first outdoor heat exchanger or the second outdoor heat exchanger) is small, it ensures that there is sufficient warm refrigerant flowing through the outdoor heat exchanger to be defrosted, preventing the refrigerant from condensing too early, thereby providing sufficient latent heat for rapid defrosting. The equivalent indoor heat exchanger has a large subcooling, and the refrigerant fully releases heat in the indoor heat exchanger, using as much heat as possible for indoor heating and improving thermal comfort.

[0156] Determine the detected value of the first temperature sensor. The detected value of the second temperature sensor The detected value of the compressor suction side pressure sensor Does the preset defrost exit condition meet?

[0157] For example, the defrosting exit condition can be the detection value of the first temperature sensor. The detected value of the second temperature sensor All are above the target defrost temperature Or the detected value of the compressor suction side pressure sensor. Defrosting pressure higher than target And when the preset time is reached, it is determined to be the detection value of the first temperature sensor. The detected value of the second temperature sensor The detected value of the compressor suction side pressure sensor Once the preset defrosting exit conditions are met, the heating mode will resume operation.

[0158] In some embodiments of this application, the processing device may be configured to operate an outdoor mode switching unit 27 and an indoor mode switching unit 28, such that the outdoor high-pressure gas-side valve opens multiple outdoor high-pressure gas pipes, the indoor high-pressure gas-side valve opens a portion of the indoor high-pressure gas pipes, the indoor low-pressure gas-side valve opens a portion of the indoor low-pressure gas pipes, and the outdoor low-pressure gas-side valve cuts off multiple indoor low-pressure gas pipes, so that some indoor heat exchangers operate as evaporators, some indoor heat exchangers operate as condensers, and the outdoor heat exchanger operates as a condenser.

[0159] like Figure 13As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, in conjunction with the throttling unit, enable the air conditioning system to operate in the first simultaneous cooling and heating mode.

[0160] The first outdoor throttling element 7 is in the fully open operating range, the second outdoor throttling element 8 is in the fully open operating range, the first indoor throttling element 9 is in the throttling operating range, and the second indoor throttling element 10 is in the fully open operating range.

[0161] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the closed state, the second outdoor low-pressure gas-side valve 14 is in the closed state, the first outdoor high-pressure gas-side valve 15 is in the open state, the second outdoor high-pressure gas-side valve 16 is in the open state, the first outdoor bypass valve 17 is in the closed state, and the second outdoor bypass valve 18 is in the closed state.

[0162] The first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the open state, the second indoor low-pressure gas-side valve 22 is in the closed state, the first indoor high-pressure gas-side valve 23 is in the closed state, the second indoor high-pressure gas-side valve 24 is in the open state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0163] Guided by the first outdoor manifold 201 and the first indoor manifold 301, the high-temperature, high-pressure refrigerant discharged from the compressor 2 is divided into three paths. The first path flows into the second indoor heat exchanger 6 via the second indoor high-pressure gas-side valve 24. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the second indoor throttling element 10 and the second indoor liquid-side valve 20, guided by the third indoor manifold 307. The second path flows into the second outdoor heat exchanger 4 via the second outdoor high-pressure gas-side valve 16. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the second outdoor throttling element 8 and the second outdoor liquid-side valve 12, guided by the third outdoor manifold 207. The third path flows into the first outdoor heat exchanger 3 via the first outdoor high-pressure gas-side valve 15. The high-pressure, low-temperature refrigerant formed by condensation flows out through the first outdoor throttling element 7 and the first outdoor liquid-side valve 11, guided by the third outdoor manifold 207.

[0164] After the three refrigerants converge, guided by the third indoor manifold 307, they are throttled into low-temperature, low-pressure liquid refrigerant through the first indoor liquid-side valve 19 and the first indoor throttling element 9, and flow into the first indoor heat exchanger 5. The low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the first indoor low-pressure gas-side valve 21 under the guidance of the second indoor manifold 304, flows into the gas-liquid separator 1, and returns to the compressor 2.

[0165] In this embodiment, the air conditioning system can enable the first indoor heat exchanger 5 to operate as an evaporator, the second outdoor heat exchanger 4 to operate as a condenser, and the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 to operate as condensers.

[0166] like Figure 14 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, in conjunction with the throttling unit, enable the air conditioning system to operate in the second simultaneous cooling and heating mode.

[0167] The first outdoor throttling element 7 is in the fully open operating range, the second outdoor throttling element 8 is in the fully open operating range, the first indoor throttling element 9 is in the fully open operating range, and the second indoor throttling element 10 is in the throttling operating range.

[0168] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the closed state, the second outdoor low-pressure gas-side valve 14 is in the closed state, the first outdoor high-pressure gas-side valve 15 is in the open state, the second outdoor high-pressure gas-side valve 16 is in the open state, the first outdoor bypass valve 17 is in the closed state, the second outdoor bypass valve 18 is in the closed state, the first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the closed state, the second indoor low-pressure gas-side valve 22 is in the open state, the first indoor high-pressure gas-side valve 23 is in the open state, the second indoor high-pressure gas-side valve 24 is in the closed state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0169] Guided by the first outdoor manifold 201 and the first indoor manifold 301, the high-temperature, high-pressure refrigerant discharged from the compressor 2 is divided into three paths. The first path flows into the first indoor heat exchanger 5 via the first indoor high-pressure gas-side valve 23. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the first indoor throttling element 9 and the first indoor liquid-side valve 19, guided by the third indoor manifold 307. The second path flows into the second outdoor heat exchanger 4 via the second outdoor high-pressure gas-side valve 16. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the second outdoor throttling element 8 and the second outdoor liquid-side valve 12, guided by the third outdoor manifold 207. The third path flows into the first outdoor heat exchanger 3 via the first outdoor high-pressure gas-side valve 15. The high-pressure, low-temperature refrigerant formed by condensation flows out through the first outdoor throttling element 7 and the first outdoor liquid-side valve 11, guided by the third outdoor manifold 207.

[0170] After the three refrigerants are combined, under the guidance of the third indoor manifold 307, they are throttled into low-temperature, low-pressure liquid refrigerant through the second indoor liquid-side valve 20 and the second indoor throttling element 10, and flow into the second indoor heat exchanger 6. The low-temperature, low-pressure superheated refrigerant formed by evaporation flows into the second indoor low-pressure gas-side valve 22 under the guidance of the second indoor manifold 304, flows into the gas-liquid separator 1, and returns to the compressor 2.

[0171] In this embodiment, the air conditioning system can enable the first indoor heat exchanger 5 to operate as a condenser, the second outdoor heat exchanger 4 to operate as an evaporator, and the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 to operate as condensers.

[0172] In some embodiments of this application, the processing device may be configured to operate an outdoor mode switching unit 27 and an indoor mode switching unit 28, such that the outdoor high-pressure gas-side valve cuts off multiple outdoor high-pressure gas pipes, the indoor high-pressure gas-side valve opens a portion of the indoor high-pressure gas pipes, the outdoor low-pressure gas-side valve opens multiple outdoor low-pressure gas pipes, and the indoor low-pressure gas-side valve opens a portion of the indoor low-pressure gas pipes, so that some indoor heat exchangers operate as evaporators, some indoor heat exchangers operate as condensers, and the outdoor heat exchanger operates as an evaporator.

[0173] like Figure 15 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, together with the throttling unit, enable the air conditioning system to operate in the third simultaneous cooling and heating mode.

[0174] The first outdoor throttling element 7 is in the throttling operating range, the second outdoor throttling element 8 is in the throttling operating range, the first indoor throttling element 9 is in the throttling operating range, and the second indoor throttling element 10 is in the fully open operating range.

[0175] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the open state, the second outdoor low-pressure gas-side valve 14 is in the open state, the first outdoor high-pressure gas-side valve 15 is in the closed state, the second outdoor high-pressure gas-side valve 16 is in the closed state, the first outdoor bypass valve 17 is in the closed state, the second outdoor bypass valve 18 is in the closed state, the first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the open state, the second indoor low-pressure gas-side valve 22 is in the closed state, the first indoor high-pressure gas-side valve 23 is in the closed state, the second indoor high-pressure gas-side valve 24 is in the open state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0176] Guided by the first indoor manifold 301, the high-temperature, high-pressure refrigerant discharged from the compressor 2 flows into the second indoor heat exchanger 6 through the high-pressure gas-side valve 24. The high-pressure, medium-temperature refrigerant formed by condensation then flows out through the second indoor throttling element 10 and the second indoor liquid-side valve 20, guided by the third indoor manifold 307. The outflowing refrigerant is then divided into three paths by the third indoor manifold 307 and the third outdoor manifold 207.

[0177] The first path, via the first indoor liquid-side valve 19 and the first indoor throttling element 9, throttles the refrigerant to a low-temperature, low-pressure liquid state, flowing into the first indoor heat exchanger 5. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the first indoor low-pressure gas-side valve 21 under the guidance of the second indoor manifold 304. The second path, via the first outdoor liquid-side valve 11 and the first outdoor throttling element 7, throttles the refrigerant to a low-temperature, low-pressure liquid state, flowing into the first outdoor heat exchanger 3. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the first outdoor low-pressure gas-side valve 13 under the guidance of the second outdoor manifold 204. The third path, via the second outdoor liquid-side valve 12 and the second outdoor throttling element 8, throttles the refrigerant to a low-temperature, low-pressure liquid state, flowing into the second outdoor heat exchanger 4. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the second outdoor low-pressure gas-side valve 14 under the guidance of the second outdoor manifold 204.

[0178] The three refrigerant streams converge and flow into the gas-liquid separator 1, then return to the compressor 2.

[0179] In this embodiment, the air conditioning system can enable the first indoor heat exchanger 5 to operate as an evaporator, the second indoor heat exchanger 6 to operate as a condenser, and the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 to operate as evaporators.

[0180] like Figure 16 As shown, the processing device can be configured to operate the outdoor mode switching unit 27 and the indoor mode switching unit 28, which, together with the throttling unit, enable the air conditioning system to operate in the fourth simultaneous cooling and heating mode.

[0181] The first outdoor throttling element 7 is in the throttling operating range, the second outdoor throttling element 8 is in the throttling operating range, the first indoor throttling element 9 is in the fully open operating range, and the second indoor throttling element 10 is in the throttling operating range.

[0182] The first outdoor liquid-side valve 11 is in the open state, the second outdoor liquid-side valve 12 is in the open state, the first outdoor low-pressure gas-side valve 13 is in the open state, the second outdoor low-pressure gas-side valve 14 is in the open state, the first outdoor high-pressure gas-side valve 15 is in the closed state, the second outdoor high-pressure gas-side valve 16 is in the closed state, the first outdoor bypass valve 17 is in the closed state, the second outdoor bypass valve 18 is in the closed state, the first indoor liquid-side valve 19 is in the open state, the second indoor liquid-side valve 20 is in the open state, the first indoor low-pressure gas-side valve 21 is in the closed state, the second indoor low-pressure gas-side valve 22 is in the open state, the first indoor high-pressure gas-side valve 23 is in the open state, the second indoor high-pressure gas-side valve 24 is in the closed state, the first indoor bypass valve 25 is in the closed state, and the second indoor bypass valve 26 is in the closed state.

[0183] Guided by the first indoor manifold 301, the high-temperature, high-pressure refrigerant discharged from the compressor 2 flows into the first indoor heat exchanger 5 through the first indoor high-pressure gas-side valve 23. The high-pressure, medium-temperature refrigerant formed by condensation flows out through the first indoor throttling element 9 and the first indoor liquid-side valve 19, guided by the third indoor manifold 307. The outflowing refrigerant is divided into three paths under the guidance of the third indoor manifold 307 and the third outdoor manifold 207.

[0184] The first path, via the second indoor liquid-side valve 20 and the second indoor throttling element 10, throttles the refrigerant to a low-temperature, low-pressure liquid state, flowing into the second indoor heat exchanger 6. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the second indoor low-pressure gas-side valve 22 under the guidance of the second indoor manifold 304. The second path, via the first outdoor liquid-side valve 11 and the first outdoor throttling element 7, throttles the refrigerant to a low-temperature, low-pressure liquid state, flowing into the first outdoor heat exchanger 3. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the first outdoor low-pressure gas-side valve 13 under the guidance of the second outdoor manifold 204. The third path, via the second outdoor liquid-side valve 12 and the second outdoor throttling element 8, throttles the refrigerant to a low-temperature, low-pressure liquid state, flowing into the second outdoor heat exchanger 4. The resulting low-temperature, low-pressure superheated refrigerant, formed through evaporation, then flows into the second outdoor low-pressure gas-side valve 14 under the guidance of the second outdoor manifold 204.

[0185] The three streams converge and flow into the gas-liquid separator 1, then return to the compressor 2.

[0186] In this embodiment, the air conditioning system can enable the first indoor heat exchanger 5 to operate as a condenser, the second indoor heat exchanger 6 to operate as an evaporator, and the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 to operate as evaporators.

[0187] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0188] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning system, comprising: an outdoor unit in which a compressor is provided; an indoor unit which is provided at least partly in an air conditioned room to supply conditioned air to the air conditioned room; characterized by further comprising: a mode switching unit which comprises: a first manifold configured to deliver refrigerant discharged from the compressor, fluidly connected to a plurality of heat exchangers through a plurality of high pressure gas pipes on which high pressure gas side valves are provided; a second manifold configured to guide refrigerant backflow to the compressor, fluidly connected to the plurality of heat exchangers through a plurality of low pressure gas pipes on which low pressure gas side valves are provided; a third manifold configured to deliver liquid refrigerant, fluidly connected to the plurality of heat exchangers through a plurality of liquid pipes on which liquid side valves are provided; and a plurality of bypass pipes configured to fluidly connect one of the low pressure gas pipes and one of the liquid pipes, the connected low pressure gas pipe and liquid pipe being fluidly connected to different heat exchangers among the plurality of heat exchangers, respectively, the bypass pipes being provided with bypass valves; the plurality of heat exchangers being provided in the outdoor unit or in the indoor unit.

2. The air conditioning system according to claim 1, characterized in that: the mode switching unit comprises: an outdoor mode switching unit which comprises: a first outdoor manifold which comprises a plurality of outdoor high pressure gas pipes fluidly connected to a plurality of outdoor heat exchangers for delivering refrigerant discharged from the compressor to the corresponding outdoor heat exchangers, the outdoor high pressure gas pipes being provided with outdoor high pressure gas side valves for opening or shutting the outdoor high pressure gas pipes; a second outdoor manifold which comprises a plurality of outdoor low pressure gas pipes fluidly connected to the plurality of outdoor heat exchangers for guiding refrigerant discharged from the outdoor heat exchangers backflow to the compressor, the outdoor low pressure gas pipes being provided with outdoor low pressure gas side valves for opening or shutting the outdoor low pressure gas pipes; a third outdoor manifold which comprises a plurality of liquid pipes fluidly connected to the plurality of outdoor heat exchangers for guiding liquid refrigerant condensed by the outdoor heat exchangers, the liquid pipes being provided with outdoor liquid side valves for opening or shutting the liquid pipes; a plurality of outdoor bypass pipes configured to fluidly connect one of the outdoor low pressure gas pipes and one of the liquid pipes, the connected outdoor low pressure gas pipe and liquid pipe being connected to different outdoor heat exchangers, respectively, the outdoor bypass pipes being provided with outdoor bypass valves for opening or shutting the outdoor bypass pipes.

3. The air conditioning system according to claim 1 or 2, characterized in that: the mode switching unit comprises: an indoor mode switching unit which comprises: a first indoor manifold which comprises a plurality of indoor high pressure gas pipes fluidly connected to a plurality of indoor heat exchangers for delivering refrigerant discharged from the compressor to the corresponding indoor heat exchangers, the indoor high pressure gas pipes being provided with indoor high pressure gas side valves for opening or shutting the indoor high pressure gas pipes; a second indoor manifold which comprises a plurality of indoor low pressure gas pipes fluidly connected to the plurality of indoor heat exchangers for guiding refrigerant discharged from the indoor heat exchangers backflow to the compressor, the indoor low pressure gas pipes being provided with indoor low pressure gas side valves for opening or shutting the indoor low pressure gas pipes; a third indoor manifold comprising: a plurality of indoor liquid pipes fluidly connected to the plurality of indoor heat exchangers for conducting liquid refrigerant condensed by the indoor heat exchangers, wherein the indoor liquid pipes are provided with indoor liquid valves for opening or closing the indoor liquid pipes; a plurality of indoor bypass pipes configured to fluidly connect one of the indoor low-pressure gas pipes and one of the indoor liquid pipes, wherein the connected indoor low-pressure gas pipe and indoor liquid pipe are connected to different indoor heat exchangers, and the indoor bypass pipes are provided with indoor bypass valves for opening or closing the indoor bypass pipes.

4. The air conditioning system of claim 3, wherein, Further comprising: a throttling unit comprising: a plurality of outdoor throttling elements fluidly connected to the plurality of outdoor heat exchangers, respectively; a plurality of indoor throttling elements fluidly connected to the plurality of indoor heat exchangers, respectively.

5. The air conditioning system of claim 4, wherein, Further comprising: a processing device configured to control the outdoor mode switching unit and the indoor mode switching unit to operate such that the outdoor high-pressure gas valves open the plurality of outdoor high-pressure gas pipes and the indoor high-pressure gas valves close the plurality of indoor high-pressure gas pipes, so as to configure the air conditioning system to operate in a cooling mode; or to control the outdoor mode switching unit and the indoor mode switching unit to operate such that the outdoor high-pressure gas valves close the plurality of outdoor high-pressure gas pipes and the indoor high-pressure gas valves open the plurality of indoor high-pressure gas pipes, so as to configure the air conditioning system to operate in a heating mode.

6. The air conditioning system of claim 4, wherein, Further comprising: a processing device configured to control the outdoor mode switching unit and the indoor mode switching unit to operate such that the outdoor high-pressure gas valves open one of the outdoor high-pressure gas pipes, the indoor high-pressure gas valves close the plurality of indoor high-pressure gas pipes, and the outdoor bypass valves open one of the outdoor bypass pipes, so as to configure the outdoor heat exchangers in series and configure the air conditioning system to operate in a cooling mode; or to control the outdoor mode switching unit and the indoor mode switching unit to operate such that the indoor high-pressure gas valves open one of the indoor high-pressure gas pipes, the outdoor high-pressure gas valves close the plurality of outdoor high-pressure gas pipes, and the indoor bypass valves open one of the indoor bypass pipes, so as to configure the indoor heat exchangers in series and configure the air conditioning system to operate in a heating mode. Further comprising:

7. The air conditioning system of claim 4, wherein, a processing device configured to control the outdoor mode switching unit and the indoor mode switching unit to operate such that the outdoor high-pressure gas valves open one of the outdoor high-pressure gas pipes, the indoor high-pressure gas valves open the plurality of indoor high-pressure gas pipes, the outdoor low-pressure gas valves open one of the outdoor low-pressure gas pipes, and the indoor low-pressure gas valves close the plurality of indoor low-pressure gas pipes, so as to configure the indoor heat exchangers to operate as condensers and one of the outdoor heat exchangers to operate as a condenser, and configure the air conditioning system to operate in an uninterrupted heating mode.

8. The air conditioning system of claim 7, wherein: the processing device is configured to control the opening degree of the throttling element corresponding to the outdoor heat exchanger operating as an evaporator to make the difference between the supercooling degree of the outdoor heat exchanger to be defrosted and the equivalent supercooling degree of the indoor heat exchanger negative when the uninterrupted mode is executed. Further comprising:

9. The air conditioning system of claim 4, wherein, ​ The processing device is configured to operate the outdoor mode switching unit and the indoor mode switching unit such that the outdoor high-pressure gas-side valve opens a plurality of outdoor high-pressure gas pipes, the indoor high-pressure gas-side valve opens a portion of indoor high-pressure gas pipes, the indoor low-pressure gas-side valve opens a portion of indoor low-pressure gas pipes, and the outdoor low-pressure gas-side valve closes a plurality of indoor low-pressure gas pipes, so that a portion of the indoor heat exchanger operates as an evaporator, a portion of the indoor heat exchanger operates as a condenser, and the outdoor heat exchanger operates as a condenser.

10. The air conditioning system of claim 4, wherein, Also included are: The processing device is configured to operate the outdoor mode switching unit and the indoor mode switching unit such that the outdoor high-pressure gas-side valve closes a plurality of outdoor high-pressure gas pipes, the indoor high-pressure gas-side valve opens a portion of indoor high-pressure gas pipes, the outdoor low-pressure gas-side valve opens a plurality of outdoor low-pressure gas pipes, and the indoor low-pressure gas-side valve opens a portion of indoor low-pressure gas pipes, so that a portion of the indoor heat exchanger operates as an evaporator, a portion of the indoor heat exchanger operates as a condenser, and the outdoor heat exchanger operates as an evaporator.

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