Air conditioning system

Abstract

The utility model provides an air-conditioning system which comprises at least two air-conditioning outdoor units and at least two air-conditioning indoor units, each air-conditioning outdoor unit is connected with the air-conditioning indoor unit, the air-conditioning system further comprises defrosting equipment which comprises a regulation and control device and a defrosting device, and the defrosting device is connected with each air-conditioning outdoor unit through the regulation and control device. And all the air conditioner outdoor units are subjected to defrosting operation. The air conditioning system solves the problem that an air conditioning system in the prior art is high in manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning equipment technology, and more specifically, to an air conditioning system. Background Technology

[0002] Currently, air conditioning systems with multiple outdoor units typically employ multiple defrosting control devices to achieve defrosting of the outdoor units. Each outdoor unit is equipped with a defrosting control device, allowing some outdoor units to self-circulate and defrost without absorbing heat from the indoor units. Simultaneously, while some outdoor units are defrosting, others can operate in heating mode, providing high-temperature refrigerant to the indoor units and achieving continuous heating on the indoor side. This ensures continuous heating of the indoor units during the defrosting process, reducing the impact of the outdoor unit defrosting process on indoor thermal comfort.

[0003] However, the above-mentioned scheme requires each outdoor air conditioner unit to be equipped with a corresponding defrosting control device, which places high demands on installation space in actual engineering applications and results in high product manufacturing costs. Utility Model Content

[0004] The main objective of this invention is to provide an air conditioning system that addresses the problem of high manufacturing costs in existing air conditioning systems.

[0005] To achieve the above objectives, this utility model provides an air conditioning system, including at least two outdoor air conditioning units and an indoor air conditioning unit, with each outdoor air conditioning unit connected to the indoor air conditioning unit. The air conditioning system also includes a defrosting device, comprising a control device and a defrosting device, wherein the defrosting device is connected to each outdoor air conditioning unit through the control device to perform defrosting operations on each outdoor air conditioning unit.

[0006] Furthermore, the defrosting device is an evaporating component, which includes a first heat exchange channel and a second heat exchange channel for heat exchange; at least two outdoor air conditioning units include N first outdoor air conditioning units and M second outdoor air conditioning units; wherein 1≤N<the total number of outdoor air conditioning units; 1≤M<the total number of outdoor air conditioning units; the control device is used to control the on / off state of the first outdoor air conditioning unit and the indoor air conditioning unit, the second outdoor air conditioning unit and the indoor air conditioning unit, the first outdoor air conditioning unit and the first heat exchange channel, and the second outdoor air conditioning unit and the second heat exchange channel; the air conditioning system has In the defrosting state, when the air conditioning system is in defrosting mode, the first outdoor unit is in defrosting mode, disconnected from the indoor unit and connected to the first heat exchange channel; the second outdoor unit is in heating mode, connected to both the indoor unit and the second heat exchange channel; or, the first outdoor unit is in heating mode, connected to both the indoor unit and the first heat exchange channel; the second outdoor unit is in defrosting mode, disconnected from the indoor unit and connected to the second heat exchange channel.

[0007] Furthermore, the outdoor unit of the air conditioner includes connecting pipes, through which the outdoor unit is connected to the indoor unit; the control device includes: a defrosting pipe, including a first defrosting pipe and a second defrosting pipe, both of which can be switched on and off; a first heat exchange channel is connected to the connecting pipe of the first outdoor unit through the first defrosting pipe, and a second heat exchange channel is connected to the connecting pipe of the second outdoor unit through the second defrosting pipe; and a control valve assembly, with a control valve assembly installed on each connecting pipe to control the on / off state of the connecting pipe; the control valve assembly is located on the side of the connection point between the defrosting pipe and the connecting pipe closer to the indoor unit.

[0008] Furthermore, the connecting pipeline includes: a first gas pipe, wherein the first gas pipes of at least two outdoor air conditioning units are connected to the second gas pipes of the indoor air conditioning units; a first liquid pipe, wherein the first liquid pipes of at least two outdoor air conditioning units are connected to the second liquid pipes of the indoor air conditioning units; the first defrosting pipeline includes a first connecting pipe assembly and a second connecting pipe assembly, wherein the first port of the first heat exchange channel is connected to the first liquid pipes of each of the first outdoor air conditioning units through the first connecting pipe assembly; the second port of the first heat exchange channel is connected to the first gas pipes of each of the first outdoor air conditioning units through the second connecting pipe assembly; the first connecting pipe assembly is configured to be on and off.

[0009] Furthermore, the control device also includes: a first electronic expansion valve, disposed on the first connecting pipe assembly, to control the on / off state of the first connecting pipe assembly.

[0010] Furthermore, the second defrosting pipeline includes a third connecting pipe assembly and a fourth connecting pipe assembly. The third port of the second heat exchange channel is connected to the first gas pipe of each of the second outdoor air conditioning units through the third connecting pipe assembly. The fourth port of the second heat exchange channel is connected to the first liquid pipe of each of the second outdoor air conditioning units through the fourth connecting pipe assembly. The fourth connecting pipe assembly can be switched on and off.

[0011] Furthermore, the control device also includes a second electronic expansion valve, which is disposed on the fourth connecting pipe assembly to control the on / off state of the fourth connecting pipe assembly.

[0012] Furthermore, the connecting pipeline includes: a first gas pipe, wherein the first gas pipes of at least two outdoor air conditioning units are connected to the second gas pipes of the indoor air conditioning unit; a first liquid pipe, wherein the first liquid pipes of at least two outdoor air conditioning units are connected to the second liquid pipes of the indoor air conditioning unit; and a control valve assembly including a first valve and a second valve, wherein the first valve is disposed on the first gas pipe and located on the side of the connection point between the defrosting pipeline and the connecting pipeline closer to the indoor air conditioning unit, and the second valve is disposed on the first liquid pipe and located on the side of the connection point between the defrosting pipeline and the connecting pipeline closer to the indoor air conditioning unit.

[0013] Furthermore, the air conditioning system includes a main gas pipe and a main liquid pipe, and the connecting pipes include: a first gas pipe, wherein the first gas pipes of at least two outdoor air conditioning units are connected to the second gas pipes of the indoor air conditioning units through the main gas pipe; and a first liquid pipe, wherein the first liquid pipes of at least two outdoor air conditioning units are connected to the second liquid pipes of the indoor air conditioning units through the main liquid pipe.

[0014] Furthermore, the number of outdoor air conditioning units can be 2, 3, or 4; when the number of outdoor air conditioning units is 2, N=1, M=1; when the number of outdoor air conditioning units is 3, N=1, M=2; or, N=2, M=1; when the number of outdoor air conditioning units is 4, N=1, M=3; or, N=2, M=2; or, N=3, M=1.

[0015] The present invention provides an air conditioning system comprising at least two outdoor units and an indoor unit, with each outdoor unit connected to an indoor unit. The system also includes a defrosting device, comprising a control device and a defrosting mechanism. The defrosting mechanism is connected to each outdoor unit via the control device, enabling defrosting of all outdoor units. Therefore, this air conditioning system achieves defrosting of multiple outdoor units simply by installing a defrosting device, reducing manufacturing costs and facilitating installation, thus solving the problem of high manufacturing costs in air conditioning systems. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the first outdoor unit of the air conditioner defrosting and the second outdoor unit of the air conditioner heating according to a first embodiment of the air conditioning system of the present invention is shown.

[0018] Figure 2 A schematic diagram of the first outdoor unit of the air conditioning system according to the first embodiment of the present invention is shown, showing the heating of the first outdoor unit and the defrosting of the second outdoor unit.

[0019] Figure 3 A schematic diagram of refrigeration according to a first embodiment of the air conditioning system of the present invention is shown;

[0020] Figure 4 A schematic diagram of the heating function of the first embodiment of the air conditioning system according to the present invention is shown;

[0021] Figure 5 A schematic diagram of refrigeration according to a second embodiment of the air conditioning system of the present invention is shown;

[0022] Figure 6 A schematic diagram of heating according to a second embodiment of the air conditioning system of the present invention is shown;

[0023] Figure 7 A schematic diagram of the first outdoor unit defrosting and the second outdoor unit heating of the air conditioning system according to a second embodiment of the present invention is shown.

[0024] Figure 8 A schematic diagram of the first outdoor unit of the air conditioner heating and the second outdoor unit of the air conditioner defrosting according to a second embodiment of the air conditioning system of the present invention is shown.

[0025] Figure 9 A schematic diagram of refrigeration according to a third embodiment of the air conditioning system of the present invention is shown;

[0026] Figure 10 A schematic diagram of heating according to a third embodiment of the air conditioning system of the present invention is shown;

[0027] Figure 11 A schematic diagram of the first outdoor unit defrosting and the second outdoor unit heating of the air conditioning system according to the third embodiment of the present invention is shown.

[0028] Figure 12 A schematic diagram of the first outdoor unit of the air conditioner heating and the second outdoor unit of the air conditioner defrosting according to a third embodiment of the air conditioning system of the present invention is shown.

[0029] Figure 13 A schematic diagram of refrigeration according to a fourth embodiment of the air conditioning system of the present invention is shown;

[0030] Figure 14 A schematic diagram of the heating function of a fourth embodiment of the air conditioning system according to the present invention is shown;

[0031] Figure 15 A schematic diagram of the first outdoor unit defrosting and the second outdoor unit heating of the air conditioning system according to the fourth embodiment of the present invention is shown.

[0032] Figure 16 A schematic diagram of the first outdoor unit of the air conditioner heating and the second outdoor unit of the air conditioner defrosting according to the fourth embodiment of the air conditioning system of the present invention is shown.

[0033] Figure 17 A schematic diagram showing the first and second heat exchange channels of the air conditioning system according to the present invention in a co-current manner is shown.

[0034] The above figures include the following reference numerals:

[0035] 1. Air conditioner outdoor unit; 11. First air conditioner outdoor unit; 12. Second air conditioner outdoor unit; 111. First gas pipe; 112. First liquid pipe;

[0036] 2. Defrosting equipment; 201. Defrosting device; 202. First electronic expansion valve; 203. Second electronic expansion valve; 204. First port; 205. Second port; 206. Third port; 207. Fourth port;

[0037] 21. First connecting pipe assembly; 22. Second connecting pipe assembly; 23. Third connecting pipe assembly; 24. Fourth connecting pipe assembly;

[0038] 211. First valve; 212. Second valve;

[0039] 3. Air conditioner indoor unit; 301. Second gas pipe; 302. Second liquid pipe;

[0040] 401. Main trachea; 402. Main fluid tube. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] This utility model provides an air conditioning system; please refer to it. Figures 1 to 17 The system includes at least two outdoor air conditioning units 1 and indoor air conditioning units 3, with each outdoor air conditioning unit 1 connected to the indoor air conditioning unit 3. The air conditioning system also includes a defrosting device 2, which includes a control device and a defrosting device 201. The defrosting device 201 is connected to each outdoor air conditioning unit 1 through the control device so that each outdoor air conditioning unit 1 can be defrosted.

[0045] The air conditioning system of this utility model includes at least two outdoor units 1 and indoor units 3. Each outdoor unit 1 is connected to an indoor unit 3. The air conditioning system also includes a defrosting device 2, which includes a control device and a defrosting device 201. The defrosting device 201 is connected to each outdoor unit 1 through the control device, so that each outdoor unit 1 can be defrosted. Therefore, this air conditioning system can achieve defrosting operation on multiple outdoor units 1 simply by setting up the defrosting device 2, reducing product manufacturing costs and facilitating installation, thus solving the problem of high manufacturing costs in air conditioning systems.

[0046] In this embodiment, the defrosting device 201 is an evaporation component, which includes a first heat exchange channel and a second heat exchange channel for heat exchange; at least two outdoor air conditioning units 1 include N first outdoor air conditioning units 11 and M second outdoor air conditioning units 12; wherein 1≤N<the total number of outdoor air conditioning units 1; 1≤M<the total number of outdoor air conditioning units 1; the control device is used to control the on / off state of the first outdoor air conditioning unit 11 and the indoor air conditioning unit 3, the second outdoor air conditioning unit 12 and the indoor air conditioning unit 3, and the on / off state of the first outdoor air conditioning unit 11 and the first heat exchange channel, and the second outdoor air conditioning unit 12 and the second heat exchange channel; the air conditioning system The system has a defrosting mode. When the air conditioning system is in defrosting mode, the first outdoor unit 11 is in defrosting mode, disconnected from the indoor unit 3 and connected to the first heat exchange channel; the second outdoor unit 12 is in heating mode, connected to both the indoor unit 3 and the second heat exchange channel; or, the first outdoor unit 11 is in heating mode, connected to both the indoor unit 3 and the first heat exchange channel; the second outdoor unit 12 is in defrosting mode, disconnected from the indoor unit 3 and connected to the second heat exchange channel.

[0047] In practice, the control device is used to control the on / off relationship between the outdoor unit and the indoor unit of the air conditioner, as well as between the outdoor unit and the evaporator. This allows the outdoor unit to supply heat to the indoor unit while simultaneously providing heat to one heat exchange channel of the evaporator to achieve refrigerant evaporation in another defrosting path. This enables the other outdoor unit to achieve a self-circulating defrosting effect using the control device.

[0048] Specifically, the first and second heat exchange channels use counter-current flow, resulting in better heat exchange performance. Of course, the first and second heat exchange channels can also use co-current flow, but the heat exchange performance is worse than counter-current flow, such as... Figure 17 .

[0049] In this embodiment, the outdoor unit 1 of the air conditioner includes a connecting pipe, and the outdoor unit 1 is connected to the indoor unit 3 of the air conditioner through the connecting pipe; the control device includes: a defrosting pipe, including a first defrosting pipe and a second defrosting pipe, both of which can be switched on and off; a first heat exchange channel is connected to the connecting pipe of the first outdoor unit 11 of the air conditioner through the first defrosting pipe, and a second heat exchange channel is connected to the connecting pipe of the second outdoor unit 12 of the air conditioner through the second defrosting pipe; and a control valve group, each of the connecting pipes is provided with a control valve group to control the on and off of the connecting pipes; the control valve group is located on the side of the connection point between the defrosting pipe and the connecting pipe closer to the indoor unit 3 of the air conditioner.

[0050] In specific implementation, the first defrosting pipe and the second defrosting pipe are set up to realize the connection and disconnection between the first outdoor air conditioner 11 and the first heat exchange channel, and the second outdoor air conditioner 12 and the second heat exchange channel, respectively; and the control valve group is set up to realize the connection and disconnection between each outdoor air conditioner 1 and the indoor air conditioner 3.

[0051] In this embodiment, the connecting pipeline includes: a first gas pipe 111, wherein the first gas pipes 111 of at least two outdoor air conditioning units 1 are connected to the second gas pipes 301 of indoor air conditioning units 3; a first liquid pipe 112, wherein the first liquid pipes 112 of at least two outdoor air conditioning units 1 are connected to the second liquid pipes 302 of indoor air conditioning units 3; the first defrosting pipeline includes a first connecting pipe assembly 21 and a second connecting pipe assembly 22, wherein the first port 204 of the first heat exchange channel is connected to the first liquid pipes 112 of each outdoor air conditioning unit 11 through the first connecting pipe assembly 21; the second port 205 of the first heat exchange channel is connected to the first gas pipes 111 of each outdoor air conditioning unit 11 through the second connecting pipe assembly 22; the first connecting pipe assembly 21 is configured to be on and off.

[0052] In specific implementation, the connection between each outdoor air conditioner unit and the indoor air conditioner unit can be realized through the setting of the first gas pipe 111 and the first liquid pipe 112. Furthermore, the first connecting pipe assembly 21 and the second connecting pipe assembly 22 of the first defrosting pipe enable the first liquid pipe 112 and the first gas pipe 111 of the first outdoor air conditioner unit 11 to be connected through the first heat exchange channel.

[0053] In this embodiment, the control device further includes a first electronic expansion valve 202, disposed on the first connecting pipe assembly 21, to control the opening and closing of the first connecting pipe assembly 21. This arrangement enables the opening and closing of the first air conditioner outdoor unit 11 and the evaporator component. The first electronic expansion valve 202 can adjust the flow rate according to heat exchange requirements; when the valve is closed, there is no flow.

[0054] In this embodiment, the second defrosting pipeline includes a third connecting pipe assembly 23 and a fourth connecting pipe assembly 24. The third port 206 of the second heat exchange channel is connected to the first gas pipe 111 of each of the second air conditioner outdoor units 12 through the third connecting pipe assembly 23. The fourth port 207 of the second heat exchange channel is connected to the first liquid pipe 112 of each of the second air conditioner outdoor units 12 through the fourth connecting pipe assembly 24. The fourth connecting pipe assembly 24 is configured to be switchable.

[0055] In specific implementation, the third connecting pipe assembly 23 and the fourth connecting pipe assembly 24 of the second defrosting pipe enable the first liquid pipe 112 and the first gas pipe 111 of the second air conditioner outdoor unit 12 to be connected through the second heat exchange channel.

[0056] In this embodiment, the control device further includes a second electronic expansion valve 203, which is disposed on the fourth connecting pipe assembly 24 to control the on / off state of the fourth connecting pipe assembly 24. This arrangement enables the on / off state of the second outdoor air conditioning unit 12 and the evaporator component. The second electronic expansion valve 203 can adjust the flow rate according to heat exchange requirements; when the valve is closed, there is no flow.

[0057] In this embodiment, the control valve assembly includes a first valve 211 and a second valve 212. The first valve 211 is disposed on the first gas pipe 111 and located on the side of the connection point between the defrosting pipe and the connecting pipe, near the indoor unit 3 of the air conditioner. The second valve 212 is disposed on the first liquid pipe 112 and located on the side of the connection point between the defrosting pipe and the connecting pipe, near the indoor unit 3 of the air conditioner. This arrangement facilitates the control of the opening and closing of the first gas pipe 111 and the first liquid pipe 112.

[0058] In practice, the first valve 211 and the second valve 212 can be switched on and off in both directions.

[0059] In this embodiment, the air conditioning system includes a main gas pipe 401 and a main liquid pipe 402. The connecting pipes include: a first gas pipe 111, wherein the first gas pipes 111 of at least two outdoor air conditioning units 1 are connected to the second gas pipe 301 of the indoor air conditioning unit 3 through the main gas pipe 401; and a first liquid pipe 112, wherein the first liquid pipes 112 of at least two outdoor air conditioning units 1 are connected to the second liquid pipe 302 of the indoor air conditioning unit 3 through the main liquid pipe 402. This arrangement enables the connection between multiple outdoor air conditioning units and indoor air conditioning units.

[0060] In this embodiment, the number of outdoor air conditioning units 1 is 2, 3, or 4; when the number of outdoor air conditioning units 1 is 2, N=1, M=1; when the number of outdoor air conditioning units 1 is 3, N=1, M=2; or, N=2, M=1; when the number of outdoor air conditioning units 1 is 4, N=1, M=3; or, N=2, M=2; or, N=3, M=1.

[0061] In practice, the closer the total rated cooling capacity of the first outdoor air conditioner 11 and the second outdoor air conditioner 12 are, the better the defrosting effect and continuous heating effect of the air conditioning system will be. The number of N and M can be selected according to the specific project requirements.

[0062] In specific implementation, the first valve 211 and the second valve 212, the first electronic expansion valve 202, and the second electronic expansion valve 203 of the control device are used to control the on / off relationship between the liquid pipe and gas pipe of the outdoor unit and the indoor unit of the air conditioner, as well as between the outdoor unit and the evaporation component. This enables a portion of the outdoor unit to supply heat to the indoor unit while simultaneously providing heat to one heat exchange channel of the evaporation component to achieve the evaporation of refrigerant in another defrosting flow path. This allows another portion of the outdoor unit to achieve a self-circulating defrosting effect using the control device.

[0063] Specifically, for an air conditioning system with two outdoor air conditioning units, i.e., the first embodiment:

[0064] The first port 204 is connected to the first liquid pipe 112 of the first outdoor air conditioner unit 11 via the first electronic expansion valve 202 at point e. The second port 205 is connected to the first gas pipe 111 of the first outdoor air conditioner unit 11 at point f. The fourth port 207 is connected to the first liquid pipe 112 of the second outdoor air conditioner unit 12 via the second electronic expansion valve 203 at point g. The third port 206 is connected to the first gas pipe 111 of the second outdoor air conditioner unit 12 at point h. A first valve 211 is installed between point f and the main gas pipe 401, and a second valve 212 is installed between point e and the main liquid pipe 402. A first valve 211 is installed between point h and the main gas pipe 401, and a second valve 212 is installed between point g and the main liquid pipe 402.

[0065] When running in cooling mode, the system flow diagram is shown below. Figure 3The first electronic expansion valve 202 and the second electronic expansion valve 203 are closed, and the corresponding first valve 211 and second valve 212 of the two outdoor air conditioning units 1 are both open. The medium-temperature and medium-pressure refrigerant, after heat exchange in the condensers of the two outdoor air conditioning units 1, flows out from the first liquid pipe 112 of each unit, flows through the second valve 212 of each unit, and then converges into the main liquid pipe 402. It then enters the indoor evaporator from the second liquid pipe 302 for heat exchange, evaporates into low-temperature and low-pressure refrigerant, flows into the main gas pipe from the second gas pipe 301 of the indoor air conditioning unit 3, flows through the first valve 211 of each unit, and returns to the suction side of each outdoor air conditioning unit from the first gas pipe 111 to start the next cycle.

[0066] When operating in heating mode, the system flow diagram is shown below. Figure 4 The first electronic expansion valve 202 and the second electronic expansion valve 203 are closed, while the corresponding first valve 211 and second valve 212 of the two outdoor air conditioning units 1 are open. The high-temperature and high-pressure refrigerant from the high-pressure side of the outdoor unit flows through each of the first gas pipes 111, passes through each of the first valves 211, and then converges into the main gas pipe 401. After entering the indoor side through the second gas pipe 301 for heat exchange, it condenses into a medium-temperature and medium-pressure refrigerant, flows from the second liquid pipe 302 into the main liquid pipe 402, passes through each of the second valves 212, and returns to the heat exchanger of each outdoor air conditioning unit 1 through each of the first liquid pipes 112 for further heat exchange, and then returns to the suction side to start the next cycle.

[0067] When the first outdoor unit 11 of the air conditioner is in defrost mode and the second outdoor unit 12 of the air conditioner is in heating mode, the system flow diagram is attached. Figure 1The first valve 211 and the second valve 212 corresponding to the first outdoor unit 11 are closed, while the first electronic expansion valve 202, the second electronic expansion valve 203, and the first valve 211 and the second valve 212 corresponding to the second outdoor unit 12 are open. The medium-temperature, medium-pressure refrigerant from the first outdoor unit 11, after heat exchange in the condenser, flows out from the first liquid pipe 112, passes through point e, enters the first electronic expansion valve 202 for throttling and pressure reduction, enters from the first port 204 of the evaporator (i.e., the defrosting device 201), and flows out from the second port 205 of the evaporator. Inside the evaporator, the first heat exchange channel and the second heat exchange channel complete heat exchange. The refrigerant in the first heat exchange channel absorbs heat and evaporates into a low-pressure state, returning to the first gas pipe 111 of the first outdoor unit 11 via point f, returning to the suction side of the first outdoor unit 11, completing one defrosting cycle. For the second outdoor unit 12, the high-temperature, high-pressure refrigerant from its high-pressure side enters the first gas pipe 111 of the second outdoor unit 12 and splits in two at point h. A small portion of the refrigerant flows into the third port 206 of the evaporator component from point h and flows out from the fourth port 207. Inside the evaporator component, the second heat exchange channel under high temperature and high pressure and the first heat exchange channel under medium temperature and medium pressure complete heat exchange. The refrigerant in the second heat exchange channel condenses into a medium temperature and medium pressure state and returns to the first liquid pipe 112 of the second outdoor unit 12 via point g. Most of the refrigerant flows into the first valve 211 corresponding to the second outdoor unit 12 from point h and reaches the main gas pipe 401. It then enters the indoor side from the second gas pipe 301 for heat exchange, condenses into a medium temperature and medium pressure refrigerant, flows into the main liquid pipe 402 from the second liquid pipe 302, flows through the second valve 212 corresponding to the second outdoor unit 12, and returns to the first liquid pipe 112 of the second outdoor unit 12 via point g. The refrigerant from the two branches is combined and enters the first liquid pipe 112 of the second outdoor unit 12, returns to the second outdoor unit 12 for further heat exchange, and returns to the suction side, completing one heating cycle.

[0068] When the first outdoor unit 11 of the air conditioner is in heating mode and the second outdoor unit 12 of the air conditioner is in defrosting mode, the system flow diagram is shown below. Figure 2The first valve 211 and the second valve 212 corresponding to the second outdoor unit 12 are closed, while the first electronic expansion valve 202, the second electronic expansion valve 203, and the first valve 211 and the second valve 212 corresponding to the first outdoor unit 11 are open. The medium-temperature, medium-pressure refrigerant, after heat exchange in the condenser, flows out from the first liquid pipe 112 of the second outdoor unit 12, passes through point g and enters the second electronic expansion valve 203 for throttling and pressure reduction, enters from the fourth port 207 of the evaporator component and flows out from the third port 206 of the evaporator component. Inside the evaporator component, the second heat exchange channel and the first heat exchange channel complete heat exchange. The refrigerant in the second heat exchange channel absorbs heat and evaporates into a low-pressure state, then returns to the first gas pipe 111 of the second outdoor unit 12 via point h, returning to the suction side of the second outdoor unit 12, completing one defrosting cycle. The high-temperature, high-pressure refrigerant from the high-pressure side of the first outdoor unit 11 enters the first gas pipe 111 of the first outdoor unit 11 and splits in two at point f. A small portion of the refrigerant flows into the second port 205 of the evaporator component from point f and flows out from the first port 204 of the evaporator component. Inside the evaporator component, the first heat exchange channel under high temperature and high pressure and the second heat exchange channel under medium temperature and medium pressure complete heat exchange. The refrigerant in the first heat exchange channel condenses into a medium temperature and medium pressure state and returns to the first liquid pipe 112 of the first outdoor unit 11 via point e. Most of the refrigerant flows into the first valve 211 corresponding to the first outdoor unit 11 from point f and reaches the main gas pipe 401. It then enters the indoor side for heat exchange from the second gas pipe 301, condenses into a medium temperature and medium pressure refrigerant, flows into the main liquid pipe 402 from the second liquid pipe 302, flows through the second valve 212 corresponding to the first outdoor unit 11, and returns to the first liquid pipe 112 of the first outdoor unit 11 via point e. The refrigerant from the two branches is combined and enters the first liquid pipe 112 of the first outdoor unit 11, returns to the outdoor unit for further heat exchange, and returns to the suction side, completing one heating cycle. The valve actions of the above four operating modes are summarized in Table 1.

[0069] Table 1

[0070]

[0071] It is evident that for an air conditioning system with two outdoor units, defrosting of both outdoor units can be achieved simply by installing defrosting device 2, thereby reducing product manufacturing costs and installation space requirements.

[0072] Specifically, for an air conditioning system with three outdoor air conditioning units, i.e., the second embodiment:

[0073] An air conditioning system with three outdoor units adds one more outdoor unit compared to a system with two outdoor units. This additional outdoor unit can be connected to either the first port 204 and the second port 205, or the third port 206 and the fourth port 207. The effect is the same; the only difference is the pipe connection method. This explanation uses the example of the third outdoor unit being connected to the third port 206 and the fourth port 207.

[0074] Based on the known structure of the air conditioning system with two outdoor air conditioning units, the two second outdoor air conditioning units 12 are on the same side. After the fourth port 207 passes through the second electronic expansion valve 203, the fourth connecting pipe assembly 24 splits into two, which are respectively connected to the first liquid pipes 112 of the two second outdoor air conditioning units 12 at points g and i; the third connecting pipe assembly 23 splits into two, which are respectively connected to the first gas pipes 111 of the two second outdoor air conditioning units 12 at points h and j.

[0075] When running in cooling mode, the system flow diagram is shown below. Figure 5 The first electronic expansion valve 202 and the second electronic expansion valve 203 are closed, and the first valve 211 and the second valve 212 corresponding to the three outdoor air conditioning units 1 are opened. The medium-temperature and medium-pressure refrigerant flows out from the first liquid pipe 112 of each outdoor air conditioning unit 1, passes through the second valve 212 of each outdoor air conditioning unit 1, and converges into the main liquid pipe 402. It then enters the indoor unit for heat exchange from the second liquid pipe 302, evaporates to a low-temperature and low-pressure state, and flows out from the second gas pipe 301. After passing through the main gas pipe 401, it passes through the first valve 211 of each outdoor air conditioning unit 1 and returns to the first gas pipe 111 of each outdoor air conditioning unit 1, returning to the suction side of each outdoor air conditioning unit 1, and starting the next refrigeration cycle.

[0076] When operating in heating mode, the system flow diagram is shown below. Figure 6 The first electronic expansion valve 202 and the second electronic expansion valve 203 are closed, while the first valve 211 and the second valve 212 corresponding to the three outdoor air conditioning units 1 are open. High-temperature and high-pressure refrigerant flows out from the first gas pipe 111 of each outdoor air conditioning unit 1, passes through the first valve 211 of each outdoor air conditioning unit 1, and converges into the main gas pipe 401. It then enters the indoor air conditioning unit 3 through the second gas pipe 301 for heat exchange. After condensing to a medium-temperature and medium-pressure state, it flows out from the second liquid pipe 302, passes through the main liquid pipe 402, passes through the second valve 212 of each outdoor air conditioning unit 1, and returns to the first liquid pipe 112 of each outdoor air conditioning unit 1. It then returns to the outdoor side for further heat exchange and carries the suction side to start the next heating cycle.

[0077] When the first outdoor unit of the air conditioner is in defrost mode (11) and both outdoor units of the second air conditioner are in heating mode (12), the system flow diagram is shown below. Figure 7The first valve 211 and the second valve 212 corresponding to the first outdoor unit 11 are closed, while the first electronic expansion valve 202, the second electronic expansion valve 203, and the first valve 211 and the second valve 212 corresponding to the two second outdoor units 12 are all open. The medium-temperature, medium-pressure refrigerant from the first outdoor unit 11, after heat exchange in the condenser, flows out from the first liquid pipe 112 of the first outdoor unit 11, passes through point e and enters the first electronic expansion valve 202 for throttling and pressure reduction, enters from the first port 204 of the evaporator component and flows out from the second port 205 of the evaporator component. Inside the evaporator component, the first heat exchange channel and the second heat exchange channel complete heat exchange. The refrigerant in the first heat exchange channel absorbs heat and evaporates into a low-pressure state, then returns to the first gas pipe 111 of the first outdoor unit 11 via point f, returning to the suction side of the first outdoor unit 11, completing one defrosting cycle. The high-temperature, high-pressure refrigerant from the high-pressure side of the two second outdoor units 12 enters the first gas pipe 111 of each of the two second outdoor units 12, and is split into two at points h and j respectively. A small portion of the refrigerant flows into the third port 206 of the evaporator component from points h and j, and flows out from the fourth port 207 of the evaporator component. Inside the evaporator component, the second heat exchange channel under high temperature and high pressure and the first heat exchange channel under medium temperature and medium pressure complete heat exchange. The refrigerant in the second heat exchange channel condenses into a medium temperature and medium pressure state, and returns to the first liquid pipe 112 of each second outdoor unit 12 through points g and i respectively. Most of the refrigerant flows into the first valve 211 of each second outdoor unit 12 from points h and j, reaches the main gas pipe 401, and enters the indoor side for heat exchange from the second gas pipe 301. It condenses into a medium temperature and medium pressure refrigerant, flows into the main liquid pipe 402 from the second liquid pipe 302, flows through the second valve 212 of each second outdoor unit 12, passes through points g and i, and returns to the first liquid pipe 112 of the two second outdoor units 12. Then it returns to the two second outdoor units 12 for further heat exchange and returns to the suction side, completing one heating cycle.

[0078] When the first outdoor unit of the air conditioner is in heating mode (11) and the two outdoor units of the second air conditioner are in defrosting mode (12), the system flow diagram is shown below. Figure 8The first valve 211 and the second valve 212 corresponding to the two second outdoor air conditioning units 12 are both closed, while the first electronic expansion valve 202, the second electronic expansion valve 203, and the first valve 211 and the second valve 212 corresponding to the first outdoor air conditioning unit 11 are open. The medium-temperature and medium-pressure refrigerant after heat exchange in the condenser of the two second outdoor air conditioning units 12 flows out from the first liquid pipe 112 of the two second outdoor air conditioning units 12, passes through points g and i, enters the second electronic expansion valve 203 for throttling and pressure reduction, enters from the fourth port 207 of the evaporator component, and flows out from the third port 206 of the evaporator component. Inside the evaporator component, the second heat exchange channel and the first heat exchange channel complete heat exchange. The refrigerant in the second heat exchange channel absorbs heat and evaporates into a low-pressure state refrigerant, and returns to the first gas pipe 111 of the two second outdoor air conditioning units 12 through points h and j, returning to the suction side of the two second outdoor air conditioning units 12, completing one defrosting cycle. The high-temperature, high-pressure refrigerant from the high-pressure side of the first outdoor unit 11 enters the first gas pipe 111 of the first outdoor unit 11 and splits into two at point f. A small portion of the refrigerant flows from point f into the second port 205 of the evaporator and flows out from the first port 204 of the evaporator. Inside the evaporator, the first heat exchange channel in a high-temperature, high-pressure state and the second heat exchange channel in a medium-temperature, medium-pressure state complete heat exchange. The refrigerant in the first heat exchange channel condenses into a medium-temperature, medium-pressure state and returns to the first liquid pipe 112 of the first outdoor unit 11 via point e. Most of the refrigerant flows from point f into the corresponding first valve 211 of the first outdoor unit 11, reaches the main gas pipe 401, and enters the indoor side for heat exchange from the second gas pipe 301. It condenses into a medium-temperature, medium-pressure refrigerant, flows from the second liquid pipe 302 into the main liquid pipe 402, flows through the corresponding second valve 212 of the first outdoor unit 11, and returns to the first liquid pipe 112 of the first outdoor unit 11 via point e. The refrigerant from the two branches is combined and enters the first liquid pipe 112 of the first outdoor unit 11 of the air conditioner, returns to the first outdoor unit 11 of the air conditioner for further heat exchange, and returns to the suction side to complete a heating cycle.

[0079] The valve body actions of the above four operating modes are summarized in Table 2.

[0080] Table 2

[0081]

[0082] It is evident that for an air conditioning system with three outdoor units, defrosting of all three outdoor units can be achieved simply by installing defrosting device 2, thereby reducing product manufacturing costs and installation space requirements.

[0083] Specifically, for an air conditioning system with four outdoor air conditioning units 1:

[0084] There are several ways to connect the four outdoor air conditioning units 1 to the defrosting equipment. For example, one outdoor air conditioning unit 1 can be connected to the first port 204 and the second port 205, and three outdoor air conditioning units 1 can be connected to the third port 206 and the fourth port 207; or two outdoor air conditioning units 1 can be connected to the first port 204 and the second port 205, and two outdoor air conditioning units 1 can be connected to the third port 206 and the fourth port 207; or three outdoor air conditioning units 1 can be connected to the first port 204 and the second port 205, and one outdoor air conditioning unit 1 can be connected to the third port 206 and the fourth port 207. The closer the total customized cooling capacity of the outdoor units on the first port 204 and the second port 205 is to the total customized cooling capacity of the outdoor units on the third port 206 and the fourth port 207, the better the defrosting and continuous heating effects of the air conditioning system. The connection method can be selected according to the specific project requirements.

[0085] Two configurations are listed here: an air conditioning system in which two outdoor air conditioning units 1 are connected to the first port 204 and the second port 205, and two outdoor air conditioning units 1 are connected to the third port 206 and the fourth port 207; and an air conditioning system in which one outdoor air conditioning unit 1 is connected to the first port 204 and the second port 205, and three outdoor air conditioning units 1 are connected to the third port 206 and the fourth port 207.

[0086] The first form, namely the third embodiment, is an air conditioning system in which two outdoor air conditioning units 1 are connected to the first port 204 and the second port 205, and two outdoor air conditioning units 1 are connected to the third port 206 and the fourth port 207, i.e., M=N=2. A schematic diagram of the refrigerant flow path for the system is shown below. Figures 9-12 .

[0087] Compared to the known three-unit outdoor air conditioning system, an additional outdoor air conditioning unit 1 is added at the first port 204 and the second port 205. From the first port 204 of the evaporator component, after passing through the first electronic expansion valve 202, the first connecting pipe assembly 21 splits into two: one path connects to the first liquid pipe 112 of one of the first outdoor air conditioning units 11 at point e, and the other path connects to the first liquid pipe 112 of another first outdoor air conditioning unit 11 at point k. The second connecting pipe assembly 22 also splits into two: one path connects to the first gas pipe 111 of one of the first outdoor air conditioning units 11 at point f, and the other path connects to the first gas pipe 111 of another first outdoor air conditioning unit 11 at point m. The third port 206 and the fourth port 207 are the same as the three-unit outdoor air conditioning system.

[0088] The valve body actions of the four operating modes are summarized in Table 3.

[0089] Table 3

[0090]

[0091] The second form, namely the fourth embodiment, is an air conditioning system in which one outdoor unit 1 is connected to the first port 204 and the second port 205, and three outdoor units 1 are connected to the third port 206 and the fourth port 207, i.e., M=1, N=3. A schematic diagram of the refrigerant flow path for the system is shown below. Figures 13-16 .

[0092] Compared to the known outdoor air conditioning system with three outdoor units, an additional outdoor unit 1 is added at the third port 206 and the fourth port 207. After passing through the second electronic expansion valve 203, the fourth connecting pipe assembly 24 of the fourth port 207 is divided into three parts, which are respectively connected to the first liquid pipe 112 of the three second outdoor units 12 at points g, i, and k. The third connecting pipe assembly 23 is divided into three parts, which are respectively connected to the first gas pipe 111 of the three second outdoor units 12 at points h, j, and m.

[0093] The valve body actions of the four operating modes are summarized in Table 4.

[0094] Table 4

[0095]

[0096] It is evident that for an air conditioning system with four outdoor units, defrosting of all four outdoor units can be achieved simply by installing defrosting equipment 2, thereby reducing product manufacturing costs and installation space requirements.

[0097] In other embodiments, the number of outdoor air conditioning units may be increased where feasible, and this technical solution also applies.

[0098] This utility model solves the technical problem: In order to achieve the technical effect of simultaneously supplying heat to the indoor side during the defrosting process of the indoor unit, the existing technical solutions require each outdoor unit to be equipped with a defrosting control device, which has high manufacturing costs and high installation space requirements.

[0099] The beneficial effects of this invention are as follows: In an air conditioning system, some outdoor units simultaneously supply heat to the indoor units and provide heat to one heat exchange channel of the evaporation component to achieve refrigerant evaporation in another defrosting flow path. This allows other outdoor units to achieve a self-circulating defrosting effect using a control device. The air conditioning system can achieve the same technical effect by equipping multiple outdoor units with only one defrosting control device, reducing manufacturing costs and installation space requirements.

[0100] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0101] The air conditioning system of this utility model includes at least two outdoor units 1 and indoor units 3. Each outdoor unit 1 is connected to an indoor unit 3. The air conditioning system also includes a defrosting device 2, which includes a control device and a defrosting device 201. The defrosting device 201 is connected to each outdoor unit 1 through the control device, so that each outdoor unit 1 can be defrosted. Therefore, this air conditioning system can achieve defrosting operation on multiple outdoor units 1 simply by setting up the defrosting device 2, reducing product manufacturing costs and facilitating installation, thus solving the problem of high manufacturing costs in air conditioning systems.

[0102] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0103] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0104] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An air conditioning system comprising at least two outdoor air conditioning units (1) and an indoor air conditioning unit (3), wherein each of the outdoor air conditioning units (1) is connected to the indoor air conditioning unit (3), characterized in that, The air conditioning system also includes: The defrosting device (2) includes a control device and a defrosting device (201). The defrosting device (201) is connected to each of the outdoor air conditioning units (1) through the control device to perform defrosting operations on each of the outdoor air conditioning units (1).

2. The air conditioning system according to claim 1, characterized in that, The defrosting device (201) is an evaporation component, which includes a first heat exchange channel and a second heat exchange channel for heat exchange; at least two outdoor air conditioning units (1) include N first outdoor air conditioning units (11) and M second outdoor air conditioning units (12); wherein, 1≤N<the total number of outdoor air conditioning units (1); 1≤M<the total number of outdoor air conditioning units (1); The control device is used to control the on / off state of the first outdoor unit (11) and the indoor unit (3), the second outdoor unit (12) and the indoor unit (3), the first outdoor unit (11) and the first heat exchange channel, and the second outdoor unit (12) and the second heat exchange channel; the air conditioning system has a defrosting state, and when the air conditioning system is in the defrosting state, The first outdoor unit (11) of the air conditioner is in defrosting mode, disconnected from the indoor unit (3) and connected to the first heat exchange channel; the second outdoor unit (12) of the air conditioner is in heating mode, connected to both the indoor unit (3) and the second heat exchange channel; or The first outdoor unit (11) of the air conditioner is in heating mode, and the first outdoor unit (11) of the air conditioner is connected to the indoor unit (3) of the air conditioner and the first heat exchange channel; the second outdoor unit (12) of the air conditioner is in defrosting mode, and the second outdoor unit (12) of the air conditioner is disconnected from the indoor unit (3) of the air conditioner and connected to the second heat exchange channel.

3. The air conditioning system according to claim 2, characterized in that, The outdoor unit (1) of the air conditioner includes a connecting pipe, and the outdoor unit (1) of the air conditioner is connected to the indoor unit (3) of the air conditioner through the connecting pipe; the control device includes: The defrosting pipeline includes a first defrosting pipeline and a second defrosting pipeline. Both the first defrosting pipeline and the second defrosting pipeline can be switched on and off. The first heat exchange channel is connected to the connecting pipeline of the first air conditioner outdoor unit (11) through the first defrosting pipeline. The second heat exchange channel is connected to the connecting pipeline of the second air conditioner outdoor unit (12) through the second defrosting pipeline. The control valve group is provided on each of the connecting pipes to control the opening and closing of the connecting pipes; the control valve group is located on the side of the connection point between the defrosting pipe and the connecting pipe close to the indoor unit (3) of the air conditioner.

4. The air conditioning system according to claim 3, characterized in that, The connecting pipeline includes: The first air pipe (111) of at least two of the outdoor air conditioning units (1) is connected to the second air pipe (301) of the indoor air conditioning unit (3); The first liquid pipe (112) of at least two of the outdoor units (1) of the air conditioner is connected to the second liquid pipe (302) of the indoor unit (3) of the air conditioner; The first defrosting pipeline includes a first connecting pipe assembly (21) and a second connecting pipe assembly (22). The first port (204) of the first heat exchange channel is connected to the first liquid pipe (112) of each of the first air conditioning outdoor units (11) through the first connecting pipe assembly (21). The second port (205) of the first heat exchange channel is connected to the first gas pipe (iii) of each of the first air conditioning outdoor units (11) through the second connecting pipe assembly (22). The first connecting pipe assembly (21) is configured to be on and off.

5. The air conditioning system according to claim 4, characterized in that, The control device further includes: A first electronic expansion valve (202) is disposed on the first connecting pipe assembly (21) to control the on / off state of the first connecting pipe assembly (21).

6. The air conditioning system according to claim 4, characterized in that, The second defrosting pipeline includes a third connecting pipe assembly (23) and a fourth connecting pipe assembly (24). The third port (206) of the second heat exchange channel is connected to the first gas pipe (iii) of each of the second air conditioner outdoor units (12) through the third connecting pipe assembly (23). The fourth port (207) of the second heat exchange channel is connected to the first liquid pipe (112) of each of the second air conditioner outdoor units (12) through the fourth connecting pipe assembly (24). The fourth connecting pipe assembly (24) is configured to be on and off.

7. The air conditioning system according to claim 6, characterized in that, The control device further includes: A second electronic expansion valve (203) is disposed on the fourth connecting pipe assembly (24) to control the on / off state of the fourth connecting pipe assembly (24).

8. The air conditioning system according to claim 3, characterized in that, The connecting pipeline includes: The first air pipe (iii) of at least two of the outdoor air conditioning units (1) is connected to the second air pipe (301) of the indoor air conditioning unit (3); The first liquid pipe (112) of at least two of the outdoor units (1) of the air conditioner is connected to the second liquid pipe (302) of the indoor unit (3) of the air conditioner; The control valve group includes a first valve (211) and a second valve (212). The first valve (211) is disposed on the first gas pipe (iii) and is located on the side of the connection point between the defrosting pipe and the connecting pipe near the air conditioner indoor unit (3). The second valve (212) is disposed on the first liquid pipe (112) and is located on the side of the connection point between the defrosting pipe and the connecting pipe near the air conditioner indoor unit (3).

9. The air conditioning system according to claim 3, characterized in that, The air conditioning system includes a main gas pipe (401) and a main liquid pipe (402), and the connecting pipes include: The first air pipe (iii) of at least two of the outdoor air conditioning units (1) is connected to the second air pipe (301) of the indoor air conditioning unit (3) through the main air pipe (401); The first liquid pipe (112) of at least two of the outdoor units (1) of the air conditioner is connected to the second liquid pipe (302) of the indoor unit (3) of the air conditioner through the main liquid pipe (402).

10. The air conditioning system according to claim 2, characterized in that, The number of outdoor air conditioning units (1) is 2, 3, or 4; When the number of outdoor air conditioning units (1) is 2, N = 1, M = 1; When the number of outdoor air conditioning units (1) is 3, N = 1, M = 2; Alternatively, N = 2, M = 1; When the number of outdoor air conditioning units (1) is 4, N = 1, M = 3; Alternatively, N=2, M=2; Alternatively, N=3, M=1.

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