A multi-connected air conditioning system and its control method

Abstract

The present disclosure provides a multi-connected air-conditioning system and its control method, including: a compressor, an outdoor heat exchanger, a first gas-side pipe, a second gas-side pipe, and a liquid-side pipe. The first gas-side pipe, the second gas-side pipe, and the liquid-side pipe are respectively connected between the indoor side and the outdoor side, and the first gas-side pipe is connected to the exhaust end of the compressor; it further includes an indoor unit, a heat storage module, and the heat storage module is connected through a heat storage converter and arranged between at least two of the first gas-side pipe, the second gas-side pipe, and the liquid-side pipe; a constant-temperature dehumidification indoor unit, a floor heating module, and the floor heating module is connected through a floor heating converter and arranged between at least two of the first gas-side pipe, the second gas-side pipe, and the liquid-side pipe. According to the present disclosure, through a set of systems, the effects of constant-temperature dehumidification, heat storage defrosting, air-conditioning demand, and floor heating demand can be achieved simultaneously, solving the different actual needs of users, and each module can be selectively connected to or not connected to the system according to actual needs.

Description

Technical Field

[0001] The present disclosure relates to the technical field of multi-connected air conditioners, and particularly relates to a multi-connected air conditioner system and a control method thereof. Background Art

[0002] China has a vast territory and different climate characteristics, so consumers in different regions have different key functional requirements for air conditioner products. For example, in the south, the focus is on the cooling function of air conditioners; in the north, the cooling function of air conditioners is not highly concerned, and the heating and floor heating functions are mainly concerned; during the plum rain season in the Yangtze River Basin, the requirement for the constant temperature and dehumidification function of air conditioners is relatively high; in the northwest region, the solar energy resources are rich, and the photovoltaic air conditioner system is the optimal solution. To meet the functional requirements of consumers, if all functions are integrated and designed, the system is complex and the cost is very high.

[0003] At present, there is no air conditioner system on the market that can integrate an air conditioner module, a floor heating module, a domestic hot water module, a constant temperature and dehumidification module, a heat storage defrosting module, and a photovoltaic module, and simultaneously realize the applications of constant temperature and dehumidification, heat storage defrosting, air conditioner demand, floor heating demand, domestic hot water demand, and photovoltaic.

[0004] The patent with the patent number CN 210832379 U discloses an air conditioner system that integrates cooling, heating, and floor heating functions. Although this system can realize the functions of cooling, heating, constant temperature and dehumidification, and floor heating, it cannot solve the demand for hot water production, and the functions of heat storage defrosting and photovoltaic cannot be realized either.

[0005] The patent with the patent number CN104296415A discloses a system that can freely match the air conditioner system and the demand for hot water according to user needs, but this system cannot realize other functions.

[0006] Due to the technical problems that the modular all-functional multi-connected air conditioner in the prior art cannot simultaneously realize constant temperature and dehumidification, heat storage defrosting, cooling demand, heating demand, floor heating demand, etc., the present disclosure researches and designs a multi-connected air conditioner system and a control method thereof.

[0007] Disclosed content

[0008] Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that the multi-connected air conditioner system in the prior art cannot simultaneously realize constant temperature and dehumidification, heat storage defrosting, cooling demand, heating demand, and floor heating demand, so as to provide a multi-connected air conditioner system and a control method thereof.

[0009] To solve the above problems, the present disclosure provides a multi-connected air conditioner system, which includes:

[0010] A compressor, an outdoor heat exchanger, a first gas-side pipe, a second gas-side pipe, and a liquid-side pipe. The first gas-side pipe, the second gas-side pipe, and the liquid-side pipe are respectively connected between the indoor side and the outdoor side. The first gas-side pipe is connected to the exhaust end of the compressor.

[0011] It further includes at least one indoor unit, and the indoor unit is connected and arranged between the second gas-side pipe and the liquid-side pipe.

[0012] It further includes at least one heat storage module, and the heat storage module is connected and arranged between at least two of the first gas-side pipe, the second gas-side pipe, and the liquid-side pipe through a heat storage converter.

[0013] It further includes at least one constant temperature and dehumidification indoor unit, and the constant temperature and dehumidification indoor unit is connected and arranged between the first gas-side pipe and the liquid-side pipe, and / or the constant temperature and dehumidification indoor unit is connected and arranged between the second gas-side pipe and the liquid-side pipe.

[0014] It further includes at least one floor heating module, and the floor heating module is connected and arranged between at least two of the first gas-side pipe, the second gas-side pipe, and the liquid-side pipe through a floor heating converter.

[0015] In some embodiments, the indoor unit includes an indoor heat exchanger and indoor unit pipelines, and the indoor heat exchanger and a first throttling device are arranged on the indoor unit pipelines.

[0016] In some embodiments, it further includes a second pipeline, a third pipeline, and a fourth pipeline. One end of the second pipeline is connected to the liquid-side pipe, and the other end is connected to the heat storage module. One end of the third pipeline is connected to the second gas-side pipe, and the other end is connected to the heat storage module. One end of the fourth pipeline is connected to the first gas-side pipe, and the other end is connected to the heat storage module.

[0017] The heat storage converter includes a second throttling device arranged on the second pipeline, a first control valve arranged on the third pipeline, and a second control valve arranged on the fourth pipeline.

[0018] In some embodiments, it further includes a fifth pipeline, a sixth pipeline, and a seventh pipeline. One end of the fifth pipeline is connected to the liquid-side pipe, and the other end is connected to the floor heating module. One end of the sixth pipeline is connected to the second gas-side pipe, and the other end is connected to the floor heating module. One end of the seventh pipeline is connected to the first gas-side pipe, and the other end is connected to the floor heating module.

[0019] The floor heating converter includes a third throttling device arranged on the fifth pipeline, a third control valve arranged on the sixth pipeline, and a fourth control valve arranged on the seventh pipeline.

[0020] In some embodiments, the floor heating module includes a capillary structure, which is communicatively disposed between at least two of the first gas side pipe, the second gas side pipe, and the liquid side pipe, and is capable of circulating a refrigerant in the capillary for heat exchange to supply floor heating.

[0021] In some embodiments, the constant temperature and dehumidification indoor unit includes a first heat exchanger and a second heat exchanger. The first heat exchanger is disposed on an eighth pipeline, one end of the eighth pipeline is communicatively connected to the second gas side pipe, and the other end is communicatively connected to the liquid side pipe. The second heat exchanger is disposed on a ninth pipeline, one end of the ninth pipeline is communicatively connected to the first gas side pipe, and the other end is communicatively connected to the liquid side pipe.

[0022] In some embodiments, a fourth throttling device is further disposed on the eighth pipeline, and a fifth throttling device is further disposed on the ninth pipeline.

[0023] In some embodiments, a first four-way valve and a second four-way valve are further included, wherein a first end of the first four-way valve is communicatively connected to a fifth end of the second four-way valve and together they are communicatively connected to an exhaust end of the compressor;

[0024] A sixth end of the second four-way valve is communicatively connected to the outdoor heat exchanger, and the other end of the outdoor heat exchanger can be communicatively connected to the first gas side pipe;

[0025] A third end of the first four-way valve is communicatively connected to the second gas side pipe;

[0026] A second end and a fourth end of the first four-way valve, and a seventh end and an eighth end of the second four-way valve are all communicatively connected and together they are communicatively connected to a suction end of the compressor.

[0027] The present disclosure further provides a control method for a multi-connected air conditioner system as described in any one of the preceding items. When it simultaneously includes the first four-way valve, the second four-way valve, the first throttling device and the second throttling device, the third throttling device and the fourth throttling device, the fifth throttling device, and the first control valve, the second control valve, the third control valve, and the fourth control valve, by controlling at least one of the first four-way valve, the second four-way valve, the first throttling device and the second throttling device, the third throttling device and the fourth throttling device, the fifth throttling device, and the first control valve, the second control valve, the third control valve, and the fourth control valve, mode control of at least one of refrigeration, heating, heating, heat storage, defrosting, and dehumidification of the room is achieved.

[0028] In some embodiments, when refrigeration is required, the first throttling device is opened, and at the same time, the first four-way valve is controlled such that the first end is communicatively connected to the second end, and the third end is communicatively connected to the fourth end; the second four-way valve is controlled such that the fifth end is communicatively connected to the sixth end, and the seventh end is communicatively connected to the eighth end.

[0029] In some embodiments, when heating is required, the first throttling device is opened, and at the same time, the first four-way valve is controlled so that the first end communicates with the third end and the second end communicates with the fourth end; the second four-way valve is controlled so that the fifth end communicates with the seventh end and the sixth end communicates with the eighth end.

[0030] In some embodiments, when constant temperature dehumidification is required, the fourth throttling device and / or the fifth throttling device is opened, and at the same time, the first four-way valve is controlled so that the first end communicates with the second end and the third end communicates with the fourth end.

[0031] In some embodiments, when floor heating is required, the third throttling device is opened, and at the same time, the third control valve is controlled to open and / or the fourth control valve is controlled to open.

[0032] In some embodiments, when the heating demand of the indoor unit is less than a preset value, the floor heating control is as follows: the first four-way valve is controlled so that the first end communicates with the third end and the second end communicates with the fourth end, the second four-way valve is controlled so that the fifth end communicates with the seventh end and the sixth end communicates with the eighth end, and the third control valve is controlled to open, and at the same time, the fourth control valve is controlled to open;

[0033] When the heating demand of the indoor unit is greater than the preset value, the floor heating control is as follows: the first four-way valve is controlled so that the first end communicates with the third end and the second end communicates with the fourth end, the second four-way valve is controlled so that the fifth end communicates with the seventh end and the sixth end communicates with the eighth end, and the third control valve is controlled to open, and at the same time, the fourth control valve is controlled to close.

[0034] In some embodiments, when heat storage is required, the second throttling device is opened, and at the same time, the first control valve is controlled to open and / or the second control valve is controlled to open.

[0035] In some embodiments, when the heating demand of the indoor unit is less than a preset value, the heat storage control is as follows: the first four-way valve is controlled so that the first end communicates with the third end and the second end communicates with the fourth end, the second four-way valve is controlled so that the fifth end communicates with the seventh end and the sixth end communicates with the eighth end, and the first control valve is controlled to open, and at the same time, the second control valve is controlled to open;

[0036] When the heating demand of the indoor unit is greater than the preset value, the heat storage control is as follows: control the first four-way valve so that the first end communicates with the third end and the second end communicates with the fourth end, control the second four-way valve so that the fifth end communicates with the seventh end and the sixth end communicates with the eighth end, and control the first control valve to open while controlling the second control valve to close.

[0037] In some embodiments, when defrosting with heat storage is required, open the second throttling device, control the first four-way valve so that the first end communicates with the second end and the third end communicates with the fourth end, control the second four-way valve so that the fifth end communicates with the sixth end and the seventh end communicates with the eighth end;

[0038] Control the first control valve to open while controlling the second control valve to close.

[0039] The multi-connected air-conditioning system and its control method provided by the present disclosure have the following beneficial effects:

[0040] The multi-connected air-conditioning system provided by the present disclosure includes a compressor, an outdoor heat exchanger, a subcooler, a common indoor unit, a constant temperature and dehumidification module, a heat storage module, and a floor heating module. One system can simultaneously achieve the effects of constant temperature and dehumidification, defrosting with heat storage, air-conditioning demand, and floor heating demand, solving different actual needs of users. Each module can be selectively connected to the system or not according to actual needs, and the connection or disconnection of each module will not have any impact on other functional modules already connected in the system. The modular full-function air-conditioning system proposed by the present disclosure can meet the needs of users in different regions, and at the same time, there is no need to install multiple systems simultaneously. Multiple functions can be freely combined and matched. This system can save the maximum cost for users on the premise of meeting user needs, is convenient and flexible to install, and comfortable to use. The present disclosure can also freely match specific indoor units and modules according to user needs to simultaneously achieve functions such as constant temperature and dehumidification, defrosting with heat storage, and floor heating. And through the floor heating converter, the refrigerant pipeline entering the floor heating module can be effectively controlled, so that the heat supply of the floor heating can be controlled according to the magnitude of the floor heating demand or the magnitude of the indoor heating demand; through the heat storage converter, the refrigerant pipeline entering the heat storage module can be effectively controlled, so that the heat storage amount can be controlled according to the magnitude of the heat storage demand or the magnitude of the indoor heating demand. And by setting the heat exchange component of the floor heating module as a capillary structure, it can be directly connected to the refrigerant pipeline and the floor heating is carried out through the refrigerant in the capillary, which can relatively improve the heat exchange efficiency compared with hot water heating, improve the indoor heating effect, and increase the comfort level. Description of the Drawings

[0041] Figure 1It is the system structure diagram of the multi-connected air conditioner of the present disclosure.

[0042] The reference numerals are shown as:

[0043] 1. Compressor; 1a. Exhaust end; 1b. Suction end; 2. Outdoor heat exchanger; 31. First gas-side pipe; 32. Second gas-side pipe; 33. Liquid-side pipe; 41. First four-way valve; 42. Second four-way valve; D1. First end; C1. Second end; E1. Third end; S1. Fourth end; D2. Fifth end; C2. Sixth end; E2. Seventh end; S2. Eighth end; 51. First control valve; 52. Second control valve; 53. Third control valve; 54. Fourth control valve; 61. Indoor unit; 611. Indoor heat exchanger; 62. Heat storage module; 621. Heat storage converter; 63. Constant temperature and dehumidification indoor unit; 631. First heat exchanger; 632. Second heat exchanger; 71. First throttling device; 72. Second throttling device; 73. Third throttling device; 74. Fourth throttling device; 75. Fifth throttling device; 9. Floor heating module; 91. Floor heating converter; 151. First large valve; 152. Second large valve; 153. Small valve; 101. Indoor unit pipeline; 102. Second pipeline; 103. Third pipeline; 104. Fourth pipeline; 105. Fifth pipeline; 106. Sixth pipeline; 107. Seventh pipeline; 108. Eighth pipeline; 109. Ninth pipeline; 13. Subcooler. Detailed implementation manners

[0044] As Figure 1 shown, the present disclosure provides a multi-connected air conditioner system, which includes:

[0045] A compressor 1, an outdoor heat exchanger 2, a first gas-side pipe 31, a second gas-side pipe 32 and a liquid-side pipe 33, wherein the first gas-side pipe 31, the second gas-side pipe 32 and the liquid-side pipe 33 are respectively connected between the indoor side and the outdoor side, and the first gas-side pipe 31 is connected to the exhaust end 1a of the compressor 1;

[0046] It further includes at least one indoor unit 61, and the indoor unit 61 is connected and arranged between the second gas-side pipe 32 and the liquid-side pipe 33;

[0047] It further includes at least one heat storage module 62, and the heat storage module 62 is connected and arranged between at least two of the first gas-side pipe 31, the second gas-side pipe 32 and the liquid-side pipe 33 through a heat storage converter 621;

[0048] It further includes at least one constant temperature and dehumidification indoor unit 63, and the constant temperature and dehumidification indoor unit 63 is arranged between the first gas-side pipe 31 and the liquid-side pipe 33, and / or the constant temperature and dehumidification indoor unit 63 is arranged between the second gas-side pipe 32 and the liquid-side pipe 33;

[0049] It further includes at least one floor heating module 9, and the floor heating module 9 is connected and arranged between at least two of the first gas side pipe 31, the second gas side pipe 32 and the liquid side pipe 33 through a floor heating converter 91.

[0050] The multi-connected air conditioner system provided by the present disclosure includes a compressor, an outdoor heat exchanger, a subcooler, a common indoor unit, a constant temperature and dehumidification module, a heat storage module and a floor heating module. One system can simultaneously achieve the effects of constant temperature and dehumidification, heat storage and defrosting, air conditioning demand, and floor heating demand applications, solve different actual needs of users, and each module can be selectively connected to the system or not according to actual needs. Whether each module is connected or not will not have any impact on other functional modules already connected in the system. The modular full-function air conditioner system proposed by the present disclosure can meet the needs of users in different regions, and at the same time, there is no need to install multiple systems at the same time, and various functions can be freely combined and matched. The system can save the maximum cost for users on the premise of meeting user needs, is convenient and flexible to install, and comfortable to use. The present disclosure can also freely match specific indoor units and modules according to user needs to simultaneously achieve functions such as constant temperature and dehumidification, heat storage and defrosting, and floor heating. And through the floor heating converter, the refrigerant pipeline entering the floor heating module can be effectively controlled, so that the heating supply amount of the floor heating can be controlled according to the size of the floor heating demand or according to the size of the indoor heating demand; through the heat storage converter, the refrigerant pipeline entering the heat storage module can be effectively controlled, so that the heat storage amount can be controlled according to the size of the heat storage demand or according to the size of the indoor heating demand.

[0051] 1. Common refrigeration and heating function module

[0052] In some embodiments, the indoor unit 61 includes an indoor heat exchanger 611 and an indoor unit pipeline 101, and the indoor heat exchanger 611 and a first throttling device 71 are arranged on the indoor unit pipeline 101.

[0053] After the high-temperature and high-pressure gas is discharged from the compressor, it passes through an oil separator, a second four-way valve 42, and an outdoor heat exchanger, and becomes a medium-pressure and low-temperature liquid. It enters the common indoor unit through a small valve on the liquid side pipe, evaporates and absorbs heat on the indoor side after throttling, performs indoor unit refrigeration, and flows into a gas-liquid separator through a second large valve 152 and a first four-way valve 41, and then returns to the compressor. When the first four-way valve 41 and the second four-way valve 42 are energized and switched, the common indoor unit performs indoor unit heating.

[0054] 2. Heat storage and defrosting module

[0055] In some embodiments, a second pipeline 102, a third pipeline 103 and a fourth pipeline 104 are further included. One end of the second pipeline 102 communicates with the liquid side pipe 33, and the other end communicates with the heat storage module 62. One end of the third pipeline 103 communicates with the second gas side pipe 32, and the other end communicates with the heat storage module 62. One end of the fourth pipeline 104 communicates with the first gas side pipe 31, and the other end communicates with the heat storage module 62;

[0056] The heat storage converter 621 includes a second throttling device 72 disposed on the second pipeline 102, a first control valve 51 disposed on the third pipeline 103, and a second control valve 52 disposed on the fourth pipeline 104.

[0057] This is a preferred structural form of the heat storage module and the heat storage converter of the present disclosure. The flow rate of the refrigerant entering the heat storage module can be controlled by the second throttling device in the heat storage converter. The opening or closing of the third pipeline can be controlled by the first control valve, and the opening or closing of the fourth pipeline can be controlled by the second control valve. Therefore, it is possible to effectively control selectively whether to store heat in the heat storage module through two pipelines or through one pipeline according to the magnitude of the heat storage demand, the heating demand of the indoor unit, or other factors, so as to accurately control to improve the heat storage capacity or reduce the heat storage amount.

[0058] The heat storage defrosting module is only used when the system is in heating operation. When the system is in cooling or other mode operation, the valves of the heat storage defrosting module are closed. When the system is in heating operation, the flow direction of the refrigerant in the system is the same as that of a common heating indoor unit. By adjusting the opening of the electronic expansion valve in the heat storage defrosting module, heat can be stored in the heat storage defrosting module without affecting the heating effect of other indoor units. When the outdoor unit needs to defrost, the valves of the common heating indoor unit are closed, and the heat storage defrosting module provides heat for defrosting, and the defrosting does not take heat from the room, improving indoor comfort.

[0059] The heat storage defrosting module can be selectively installed. If the main control of the air conditioning system detects that there is no heat storage defrosting module connected to the system, the common indoor unit defrosting is performed during defrosting; when it is detected that there is a heat storage defrosting module connected, the system operates according to the established heat storage defrosting control logic, and the heat storage defrosting is performed during defrosting. When the heat storage defrosting fails to complete defrosting, the system performs the common indoor unit defrosting operation again.

[0060] 3. Floor heating module

[0061] In some embodiments, a fifth pipeline 105, a sixth pipeline 106 and a seventh pipeline 107 are further included. One end of the fifth pipeline 105 is connected to the liquid side pipe 33, and the other end is connected to the floor heating module 9. One end of the sixth pipeline 106 is connected to the second gas side pipe 32, and the other end is connected to the floor heating module 9. One end of the seventh pipeline 107 is connected to the first gas side pipe 31, and the other end is connected to the floor heating module 9;

[0062] The floor heating converter 91 includes a third throttling device 73 provided on the fifth pipeline 105, a third control valve 53 provided on the sixth pipeline 106, and a fourth control valve 54 provided on the seventh pipeline 107.

[0063] This is a preferred structural form of the floor heating module and the floor heating converter of the present disclosure. The flow rate of the refrigerant entering the floor heating module can be controlled by the second throttling device in the floor heating converter. The third pipeline can be controlled to be opened or closed by the first control valve, and the fourth pipeline can be controlled to be opened or closed by the second control valve. Therefore, it is possible to effectively control selectively whether to supply heat to the floor heating module through two pipelines or through one pipeline according to the size of the floor heating demand, the heating demand of the indoor unit, or other factors, so as to accurately control to improve the floor heating capacity or reduce the floor heating amount.

[0064] In some embodiments, the floor heating module 9 includes a capillary structure, which is connected and arranged between at least two of the first gas side pipe 31, the second gas side pipe 32 and the liquid side pipe 33, and the refrigerant can flow through the capillary for heat exchange to supply floor heating.

[0065] And by setting the heat exchange component of the floor heating module as a capillary structure, it can be directly connected to the refrigerant pipeline and the floor heating can be carried out through the refrigerant in the capillary, which can relatively improve the heat exchange efficiency compared with hot water heating, improve the heating effect indoors, and increase the comfort.

[0066] The operation of the floor heating module is the same as the principle of domestic hot water, and the detection access and implementation process are also the same.

[0067] 4. Constant temperature and dehumidification module

[0068] In some embodiments, the constant temperature and dehumidification indoor unit 63 includes a first heat exchanger 631 and a second heat exchanger 632. The first heat exchanger 631 is provided on the eighth pipeline 108. One end of the eighth pipeline 108 is connected to the second gas side pipe 32, and the other end is connected to the liquid side pipe 33. The second heat exchanger 632 is provided on the ninth pipeline 109. One end of the ninth pipeline 109 is connected to the first gas side pipe 31, and the other end is connected to the liquid side pipe 33.

[0069] After the high-temperature and high-pressure gas is discharged from the compressor, it passes through an oil separator and is divided into two paths before entering the four-way valve: The first path passes through the second four-way valve 42 and the outdoor heat exchanger, becoming a medium-pressure and low-temperature liquid, and then enters the constant-temperature dehumidification module through the small valve of the liquid side pipe. After throttling through the fourth throttling device 74, it evaporates and absorbs heat in the first heat exchanger 631, performing refrigeration on the first heat exchanger 631. The second path directly enters the constant-temperature dehumidification module through the first large valve 151 of the gas side pipe (high pressure), condenses and releases heat in the second heat exchanger 632, and after passing through the fifth throttling device 75, it converges with the first path of refrigerant entering the fourth throttling device 74 and evaporates and absorbs heat in the first heat exchanger 631.

[0070] After the two paths converge into one path, it then flows through the second large valve 152 and the first four-way valve 41, into the gas-liquid separator, and back to the compressor. In the ordinary condensation dehumidification system, while dehumidifying, the air temperature will also decrease simultaneously. The lower outlet air temperature reduces the comfort of user use. When the high-temperature (medium-temperature) and high-humidity air flows through the constant-temperature dehumidification module, it first dehumidifies and cools at the first heat exchanger 631, and then heats up at the second heat exchanger 632, so that the outlet air temperature and humidity can always be maintained in a relatively comfortable range, improving the user experience.

[0071] When the constant-temperature dehumidification module needs to heat, the first four-way valve 41 and the second four-way valve 42 are electrically commutated. The refrigerant in the first heat exchanger 631 flows in the same direction as that of the ordinary refrigeration and heating indoor unit. After condensing and releasing heat in the first heat exchanger 631, it converges with the refrigerant that condenses and releases heat in the second heat exchanger 632, and then returns to the outdoor heat exchanger through the liquid side pipe to evaporate, and then returns to the compressor. Compared with the heating of the ordinary indoor unit, the heating of the constant-temperature dehumidification module has better heating effect because there are two heat exchangers.

[0072] When a constant-temperature dehumidification module is detected to be connected to the system, the main control of the air-conditioning system executes the constant-temperature dehumidification function according to the mode requirements set by the user. If the module is not connected to the system, the system does not have this function and the user cannot set it. It has no impact on other functions connected to the system, and other functions can be realized normally.

[0073] In this modular full-function air-conditioning system, the above 4 types of modules can all be freely selected and matched to achieve different usage functions.

[0074] In some embodiments, it further includes a first four-way valve 41 and a second four-way valve 42, wherein the first end D1 of the first four-way valve 41 is communicated with the fifth end D2 of the second four-way valve 42 and is jointly communicated to the exhaust end 1a of the compressor 1;

[0075] The sixth end C2 of the second four-way valve 42 is communicated with the outdoor heat exchanger 2, and the other end of the outdoor heat exchanger 2 can be communicated with the first gas side pipe 31;

[0076] The third end E1 of the first four-way valve 41 communicates with the second gas-side pipe 32;

[0077] The second end C1 and the fourth end S1 of the first four-way valve 41 communicate with the seventh end E2 and the eighth end S2 of the second four-way valve 42, and are jointly connected to the suction end 1b of the compressor 1.

[0078] In some embodiments, when the first control valve 51 and the second control valve 52 are included, at least one of the first control valve 51 and the second control valve 52 is a solenoid valve; when the third control valve 53 and the fourth control valve 54 are included, at least one of the third control valve 53 and the fourth control valve 54 is a solenoid valve.

[0079] The present disclosure also provides a control method for a multi-connected air conditioner system as described in any one of the preceding items. When the first four-way valve 41, the second four-way valve 42, the first throttling device 71, the second throttling device 72, the third throttling device 73, the fourth throttling device 74, the fifth throttling device 75, the first control valve 51, the second control valve 52, the third control valve 53, and the fourth control valve 54 are included at the same time, by controlling the first four-way valve 41, the second four-way valve 42, the first throttling device 71, the second throttling device 72, the third throttling device 73, the fourth throttling device 74, the fifth throttling device 75, the first control valve 51, the second control valve 52, the third control valve 53, and the fourth control valve 54, mode control of at least one of refrigeration, heating, heating, heat storage, defrosting, and dehumidification of the room is achieved.

[0080] The present invention researches and designs a modular all-functional multi-connected system, integrating refrigeration, heating, dehumidification, floor heating, heat storage and defrosting, improving the comfort of customers and reducing the overall installation space.

[0081] It includes a compressor, two four-way valves, an outdoor heat exchanger, an outdoor electronic expansion valve, a subcooler, a subcooler electronic expansion valve, multiple ordinary indoor units, a dehumidification indoor unit, a floor heating converter, a capillary network, a heat storage converter, a heat storage module, and electronic expansion valves corresponding to each indoor unit, and a gas-liquid separator. When operating in different modes, the refrigerant flow is as follows:

[0082] Indoor unit refrigeration: Compressor - Second four-way valve 42 - Outdoor heat exchanger - Outdoor DPF (electronic expansion valve) - Subcooler - Liquid-side pipe - Indoor unit DPF - Indoor unit - First four-way valve 41 - Gas separator - Compressor.

[0083] In some embodiments, when refrigeration is required, the first throttling device 71 is opened, and at the same time, the first four-way valve 41 is controlled so that the first end D1 communicates with the second end C1, and the third end E1 communicates with the fourth end S1; the second four-way valve 42 is controlled so that the fifth end D2 communicates with the sixth end C2, and the seventh end E2 communicates with the eighth end S2.

[0084] In some embodiments, when heating is required, the first throttling device 71 is opened, and at the same time, the first four-way valve 41 is controlled so that the first end D1 communicates with the third end E1, and the second end C1 communicates with the fourth end S1; the second four-way valve 42 is controlled so that the fifth end D2 communicates with the seventh end E2, and the sixth end C2 communicates with the eighth end S2.

[0085] 1. Ordinary refrigeration and heating function module

[0086] After the high-temperature and high-pressure gas is discharged from the compressor, it passes through the oil separator, the second four-way valve 42, and the outdoor heat exchanger, and becomes a medium-pressure and low-temperature liquid. It enters the ordinary indoor unit through the small valve on the liquid side pipe, throttles and then evaporates and absorbs heat on the indoor side to perform indoor unit refrigeration. It flows into the gas-liquid separator through the second large valve 152 and the first four-way valve 41, and then returns to the compressor. When the first four-way valve 41 and the second four-way valve 42 are powered on and commutated, the ordinary indoor unit performs indoor unit heating.

[0087] In some embodiments, when constant temperature dehumidification is required, the fourth throttling device 74 and / or the fifth throttling device 75 is opened, and at the same time, the first four-way valve 41 is controlled so that the first end D1 communicates with the second end C1, and the third end E1 communicates with the fourth end S1.

[0088] 2. Constant temperature dehumidification module

[0089] After the high-temperature and high-pressure gas is discharged from the compressor, it passes through the oil separator and is divided into two paths before entering the four-way valve: the first path passes through the second four-way valve 42 and the outdoor heat exchanger, and becomes a medium-pressure and low-temperature liquid. Then it enters the constant temperature dehumidification module through the small valve on the liquid side pipe, throttles through the fourth throttling device 74 and then evaporates and absorbs heat in the first heat exchanger 631 to perform refrigeration of the first heat exchanger 631. The second path directly enters the constant temperature dehumidification module through the first large valve 151 on the gas side pipe (high pressure), condenses and releases heat in the second heat exchanger 632, and after passing through the fifth throttling device 75, converges with the first path of refrigerant entering the fourth throttling device 74 and evaporates and absorbs heat in the first heat exchanger 631.

[0090] After the two paths converge into one path, it then flows into the vapor-liquid separator through the second large valve 152 and the first four-way valve 41, and returns to the compressor. In the ordinary condensation dehumidification system, while dehumidifying, the air temperature will also decrease simultaneously. The lower outlet air temperature reduces the comfort of users. When high-temperature (medium-temperature) and high-humid air flows through the constant-temperature dehumidification module, it first dehumidifies and cools at the first heat exchanger 631, and then heats up at the second heat exchanger 632, so that the outlet air temperature and humidity can always be maintained within a relatively comfortable range, improving the user experience.

[0091] When the constant-temperature dehumidification module needs to heat, the first four-way valve 41 and the second four-way valve 42 are energized to change direction. The refrigerant in the first heat exchanger 631 flows in the same direction as that in the ordinary refrigeration and heating indoor unit. After condensing and releasing heat in the first heat exchanger 631, it converges with the refrigerant that condenses and releases heat in the second heat exchanger 632, and then returns to the outdoor heat exchanger to evaporate through the liquid side pipe, and then returns to the compressor. Compared with the heating of ordinary indoor units, the heating of the constant-temperature dehumidification module has better heating effect because there are two heat exchangers.

[0092] When it is detected that a constant-temperature dehumidification module is connected to the system, the main control of the air-conditioning system executes the constant-temperature dehumidification function according to the mode requirements set by the user. If the module is not connected to the system, the system does not have this function and the user cannot set it. It has no impact on other functions connected to the system, and other functions can be realized normally.

[0093] Indoor unit refrigeration + three-pipe dehumidification: Two paths are carried out simultaneously

[0094] Compressor - Second four-way valve 42 - Outdoor heat exchanger - Outdoor DPF (electronic expansion valve) - Liquid side pipe - Indoor unit DPF, dehumidifying air-conditioning EXV1 - Indoor unit, dehumidification module - Gas side pipe (low pressure) - Four-way valve A - Gas separator - Compressor.

[0095] Compressor - Gas side pipe (high pressure) - Dehumidification module - Dehumidifying EXV2 - Indoor unit DPF, dehumidifying air-conditioning EXV1 - Dehumidifying air-conditioning, indoor unit - Gas side pipe (low pressure) - First four-way valve 41 - Gas separator - Compressor.

[0096] 3. Floor heating module

[0097] In some embodiments, when floor heating is required, the third throttling device 73 is opened, and at the same time, the third control valve 53 is controlled to open and / or the fourth control valve 54 is controlled to open.

[0098] In some embodiments, when the heating demand of the indoor unit is less than a preset value, the first four-way valve 41 is controlled such that the first end D1 communicates with the third end E1, and the second end C1 communicates with the fourth end S1; the second four-way valve 42 is controlled such that the fifth end D2 communicates with the seventh end E2, and the sixth end C2 communicates with the eighth end S2; the third control valve 53 is controlled to open, and at the same time, the fourth control valve 54 is controlled to open;

[0099] When the heating demand of the indoor unit is greater than the preset value, the first four-way valve 41 is controlled such that the first end D1 communicates with the third end E1, and the second end C1 communicates with the fourth end S1; the second four-way valve 42 is controlled such that the fifth end D2 communicates with the seventh end E2, and the sixth end C2 communicates with the eighth end S2; the third control valve 53 is controlled to open, and at the same time, the fourth control valve 54 is controlled to close.

[0100] The capillary network floor heating module is only available during heating operation. When the unit is operating in cooling mode, the third control valve 53 and the sixth throttling device 76 are closed, which can ensure that no refrigerant accumulates in the capillary network floor heating system. When the system is operating in heating mode, floor heating and air conditioning heating can be selected. When the capillary network is used for floor heating, the fourth control valve 54 is opened, and the high-temperature and high-pressure refrigerant flows into the capillary tube to release heat, then is throttled by the third throttling device 73, passes through the small valve to the outdoor unit for evaporation and heat absorption, and then returns to the compressor.

[0101] Floor heating: It will control the different flow directions of the refrigerant according to the heating demand of the whole machine.

[0102] When the heating demand is small (at this time, the floor heating can use a large amount of heat): Both paths flow into the floor heating converter simultaneously

[0103] Compressor - First four-way valve 41 - Gas side pipe (high pressure) - Floor heating converter - Fourth control valve 54 - Capillary network - Floor heating converter DPF - Liquid pipe side - Subcooler - Outdoor DPF - Outdoor heat exchanger - Second four-way valve 42 - Gas separator - Compressor.

[0104] Compressor - First four-way valve 41 - Gas side pipe (low pressure) - Floor heating converter - Third control valve 53 is opened - Capillary network - Floor heating converter DPF - Liquid pipe side - Subcooler - Outdoor DPF - Outdoor heat exchanger - Second four-way valve 42 - Gas separator - Compressor.

[0105] When the heating demand is large (at this time, the floor heating can use a small amount of heat):

[0106] Compressor - First four - way valve 41 - Gas - side pipe (low pressure) - Floor heating converter (third control valve 53 open) - Capillary network - Floor heating converter DPF - Liquid - pipe side - Sub - cooler - Outdoor DPF - Outdoor heat exchanger - Second four - way valve 42 - Gas separator - Compressor.

[0107] 4. Thermal storage defrosting module

[0108] In some embodiments, when thermal storage is required, the second throttling device 72 is opened, and at the same time, the first control valve 51 is controlled to open and / or the second control valve 52 is controlled to open.

[0109] In some embodiments, when the heating demand of the indoor unit is less than the preset value, the first four - way valve 41 is controlled such that the first end D1 is communicated with the third end E1, the second end C1 is communicated with the fourth end S1, the second four - way valve 42 is controlled such that the fifth end D2 is communicated with the seventh end E2, the sixth end C2 is communicated with the eighth end S2, and the first control valve 51 is controlled to open, and at the same time, the second control valve 52 is controlled to open;

[0110] When the heating demand of the indoor unit is greater than the preset value, the first four - way valve 41 is controlled such that the first end D1 is communicated with the third end E1, the second end C1 is communicated with the fourth end S1, the second four - way valve 42 is controlled such that the fifth end D2 is communicated with the seventh end E2, the sixth end C2 is communicated with the eighth end S2, and the first control valve 51 is controlled to open, and at the same time, the second control valve 52 is controlled to close.

[0111] In some embodiments, when thermal storage defrosting is required, the second throttling device 72 is opened, the first four - way valve 41 is controlled such that the first end D1 is communicated with the second end C1, the third end E1 is communicated with the fourth end S1, and the second four - way valve 42 is controlled such that the fifth end D2 is communicated with the sixth end C2, the seventh end E2 is communicated with the eighth end S2;

[0112] The first control valve 51 is controlled to open, and at the same time, the second control valve 52 is controlled to close.

[0113] The thermal storage defrosting module is only used when the system is in heating operation. When the system is in cooling or other modes of operation, the valves of the thermal storage defrosting module are closed. When the system is in heating operation, the flow direction of the refrigerant in the system is the same as that of a common heating indoor unit. By adjusting the opening degree of the electronic expansion valve in the thermal storage defrosting module, heat is stored in the thermal storage defrosting module without affecting the heating effect of other indoor units. When the outdoor unit needs to defrost, the valves of the common heating indoor unit are closed, and the thermal storage defrosting module provides heat for defrosting, and the defrosting does not take heat from the indoor, improving indoor comfort.

[0114] The heat storage defrosting module can be selectively installed. If the main control of the air conditioning system detects that there is no heat storage defrosting module connected to the system, the normal indoor unit defrosting is performed during defrosting; when it detects that there is a heat storage defrosting module connected, the system operates according to the established heat storage defrosting control logic, performs heat storage defrosting during defrosting, and when the heat storage defrosting fails to complete defrosting, the system then performs normal indoor unit defrosting operation.

[0115] Heat storage: It will be turned on as long as the whole machine has a heating demand. It will control the different flow directions of the refrigerant according to the size of the heating demand of the whole machine.

[0116] When the heating demand is small (the heat storage can use a large amount of heat): It flows into the heat storage module through two paths simultaneously

[0117] Compressor - gas side pipe (high pressure) - heat storage converter - second control valve 52 - heat storage module - electronic expansion valve - liquid pipe side - subcooler - outdoor DPF - outdoor heat exchanger - second four-way valve 42 - gas separator - compressor.

[0118] Compressor - first four-way valve 41 - gas side pipe (low pressure) - heat storage converter - first control valve 51 - heat storage module - electronic expansion valve - liquid pipe side - subcooler - outdoor DPF - outdoor heat exchanger - second four-way valve 42 - gas separator - compressor.

[0119] When the heating demand is large: Only one path flows into the heat storage module

[0120] Compressor - first four-way valve 41 - gas side pipe (low pressure) - heat storage converter - first control valve 51 - heat storage module - electronic expansion valve - liquid pipe side - subcooler - outdoor DPF - outdoor heat exchanger - second four-way valve 42 - gas separator - compressor.

[0121] Heat storage defrosting: When the unit has a defrosting demand, the four-way valve changes direction and becomes the refrigeration mode. The refrigerant no longer flows through the indoor unit to absorb heat from the room, but absorbs heat from the heat storage module.

[0122] Compressor - second four-way valve 42 - outdoor heat exchanger - outdoor DPF (electronic expansion valve) - subcooler - liquid side pipe - heat storage converter DPF2 - heat storage module - first control valve 51 - first four-way valve 41 - gas separator - compressor.

[0123] In this modular full-function air conditioning system, the above 4 types of modules can all be freely selected and matched to achieve different usage functions.

[0124] 1. This disclosure can solve the problem that a set of system can simultaneously have the functions of air conditioning cooling, heating, and floor heating. When this module is connected, the system main control can automatically detect and execute according to the connected module. When the system does not connect this module, it will not have any impact on the realization of other functions, and other systems can be normally realized;

[0125] 2. According to the user's requirements, the present disclosure can freely combine specific indoor units and modules to achieve the functions of constant temperature dehumidification and heat storage defrosting.

[0126] The modular full-function air conditioning system proposed by the present disclosure can meet the needs of users in different regions. At the same time, there is no need to install multiple sets of systems simultaneously, and various functions can be freely combined. This system can save the maximum cost for users on the premise of meeting their needs, is convenient and flexible to install, and comfortable to use.

[0127] The above are only the preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. The above is only the preferred implementation manner of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present disclosure, several improvements and variations can be made, and these improvements and variations should also be regarded as the protection scope of the present disclosure.

Claims

1. A multi-connected air conditioning system, characterized in that: It includes: a compressor (1), an outdoor heat exchanger (2), a first gas-side pipe (31), a second gas-side pipe (32) and a liquid-side pipe (33). The first gas-side pipe (31), the second gas-side pipe (32) and the liquid-side pipe (33) are respectively connected between the indoor side and the outdoor side, and the first gas-side pipe (31) is connected to the exhaust end (1a) of the compressor (1); It further includes at least one indoor unit (61), and the indoor unit (61) is connected and arranged between the second gas-side pipe (32) and the liquid-side pipe (33); It further includes at least one heat storage module (62), and the heat storage module (62) is connected and arranged between at least two of the first gas-side pipe (31), the second gas-side pipe (32) and the liquid-side pipe (33) through a heat storage converter (621); It further includes at least one constant temperature and dehumidification indoor unit (63), and the constant temperature and dehumidification indoor unit (63) is connected and arranged between the first gas-side pipe (31) and the liquid-side pipe (33), and / or the constant temperature and dehumidification indoor unit (63) is connected and arranged between the second gas-side pipe (32) and the liquid-side pipe (33); It further includes at least one floor heating module (9), and the floor heating module (9) is connected and arranged between at least two of the first gas-side pipe (31), the second gas-side pipe (32) and the liquid-side pipe (33) through a floor heating converter (91); It further includes a sixth pipe (106) and a seventh pipe (107). One end of the sixth pipe (106) is connected to the second gas-side pipe (32), and the other end is connected to the floor heating module (9). One end of the seventh pipe (107) is connected to the first gas-side pipe (31), and the other end is connected to the floor heating module (9). The floor heating converter (91) includes a third control valve (53) arranged on the sixth pipe (106) and a fourth control valve (54) arranged on the seventh pipe (107); It further includes a first four-way valve (41) and a second four-way valve (42), wherein the first end (D1) of the first four-way valve (41) is connected to the fifth end (D2) of the second four-way valve (42) and is jointly connected to the exhaust end (1a) of the compressor (1); The sixth end (C2) of the second four-way valve (42) is connected to the outdoor heat exchanger (2), and the other end of the outdoor heat exchanger (2) can be connected to the first gas-side pipe (31); The third end (E1) of the first four-way valve (41) is connected to the second gas-side pipe (32); The second end (C1) and the fourth end (S1) of the first four-way valve (41), and the seventh end (E2) and the eighth end (S2) of the second four-way valve (42) are all connected and jointly connected to the suction end (1b) of the compressor (1); When the heating demand of the indoor unit is less than the preset value, control the first four-way valve (41) to connect the first end (D1) to the third end (E1), and the second end (C1) to the fourth end (S1), control the second four-way valve (42) to connect the fifth end (D2) to the seventh end (E2), and the sixth end (C2) to the eighth end (S2), and control the third control valve (53) to open, and at the same time control the fourth control valve (54) to open; When the heating demand of the indoor unit is greater than the preset value, control the first four-way valve (41) to connect the first end (D1) to the third end (E1), and the second end (C1) to the fourth end (S1), control the second four-way valve (42) to connect the fifth end (D2) to the seventh end (E2), and the sixth end (C2) to the eighth end (S2), and control the third control valve (53) to open, and at the same time control the fourth control valve (54) to close; To control the different flow directions of the refrigerant according to the heating demand of the whole machine.

2. The multi-connected air conditioner system according to claim 1, wherein: The indoor unit (61) includes an indoor heat exchanger (611) and an indoor unit pipeline (101), and the indoor heat exchanger (611) and the first throttling device (71) are arranged on the indoor unit pipeline (101).

3. The multi-connected air conditioner system according to claim 1, wherein: It further includes a second pipeline (102), a third pipeline (103) and a fourth pipeline (104). One end of the second pipeline (102) is connected to the liquid side pipe (33), and the other end is connected to the heat storage module (62). One end of the third pipeline (103) is connected to the second gas side pipe (32), and the other end is connected to the heat storage module (62). One end of the fourth pipeline (104) is connected to the first gas side pipe (31), and the other end is connected to the heat storage module (62); The heat storage converter (621) includes a second throttling device (72) arranged on the second pipeline (102), a first control valve (51) arranged on the third pipeline (103) and a second control valve (52) arranged on the fourth pipeline (104).

4. The multi-connected air conditioner system according to claim 1, wherein: It further includes a fifth pipeline (105). One end of the fifth pipeline (105) is connected to the liquid side pipe (33), and the other end is connected to the floor heating module (9). The floor heating converter (91) further includes a third throttling device (73) arranged on the fifth pipeline (105).

5. The multi-connected air conditioner system according to claim 1, wherein: The floor heating module (9) includes a capillary structure, which is connected and arranged between at least two of the first gas side pipe (31), the second gas side pipe (32) and the liquid side pipe (33), and the refrigerant can flow through the capillary for heat exchange to supply floor heating.

6. The multi-connected air conditioner system according to claim 1, characterized in that: the constant temperature and dehumidification indoor unit (63) includes a first heat exchanger (631) and a second heat exchanger (632), the first heat exchanger (631) is arranged on the eighth pipeline (108), one end of the eighth pipeline (108) is communicated with the second gas side pipe (32), the other end is communicated with the liquid side pipe (33), the second heat exchanger (632) is arranged on the ninth pipeline (109), one end of the ninth pipeline (109) is communicated with the first gas side pipe (31), and the other end is communicated with the liquid side pipe (33).

7. The multi-connected air conditioner system according to claim 6, characterized in that: a fourth throttling device (74) is further arranged on the eighth pipeline (108), and a fifth throttling device (75) is further arranged on the ninth pipeline (109).

8. A control method for a multi-connected air conditioner system according to any one of claims 1-7, characterized in that: when the first four-way valve (41), the second four-way valve (42), the first throttling device (71) and the second throttling device (72), the third throttling device (73) and the fourth throttling device (74), the fifth throttling device (75) and the first control valve (51), the second control valve (52), the third control valve (53) and the fourth control valve (54) are included at the same time, by controlling the first four-way valve (41), the second four-way valve (42), the first throttling device (71) and the second throttling device (72), the third throttling device (73), the fourth throttling device (74) and the fifth throttling device (75) and the first control valve (51), the second control valve (52), the third control valve (53) and the fourth control valve (54), at least one of the mode controls of refrigeration, heating, heating, heat storage, defrosting and dehumidification for the indoor is realized.

9. The control method for a multi-connected air conditioner system according to claim 8, characterized in that: when refrigeration is required, open the first throttling device (71), and at the same time control the first four-way valve (41) so that the first end (D1) is communicated with the second end (C1), and the third end (E1) is communicated with the fourth end (S1); control the second four-way valve (42) so that the fifth end (D2) is communicated with the sixth end (C2), and the seventh end (E2) is communicated with the eighth end (S2).

10. The control method for a multi-connected air conditioner system according to claim 8, characterized in that: when heating is required, open the first throttling device (71), and at the same time control the first four-way valve (41) so that the first end (D1) is communicated with the third end (E1), and the second end (C1) is communicated with the fourth end (S1); control the second four-way valve (42) so that the fifth end (D2) is communicated with the seventh end (E2), and the sixth end (C2) is communicated with the eighth end (S2).

11. The control method for a multi-connected air conditioner system according to any one of claims 8-10, characterized in that: When constant temperature dehumidification is required, open the fourth throttling device (74) and / or the fifth throttling device (75), and at the same time control the first four-way valve (41) so that the first end (D1) communicates with the second end (C1), and the third end (E1) communicates with the fourth end (S1).

12. The control method of the multi-connected air conditioner system according to claim 8, characterized in that: When floor heating is required, open the third throttling device (73), and at the same time control the third control valve (53) to open and / or control the fourth control valve (54) to open.

13. The control method of the multi-connected air conditioner system according to claim 12, characterized in that: When the heating demand of the indoor unit is less than the preset value, control the first four-way valve (41) so that the first end (D1) communicates with the third end (E1), the second end (C1) communicates with the fourth end (S1), control the second four-way valve (42) so that the fifth end (D2) communicates with the seventh end (E2), the sixth end (C2) communicates with the eighth end (S2), and control the third control valve (53) to open, and at the same time control the fourth control valve (54) to open; When the heating demand of the indoor unit is greater than the preset value, control the first four-way valve (41) so that the first end (D1) communicates with the third end (E1), the second end (C1) communicates with the fourth end (S1), control the second four-way valve (42) so that the fifth end (D2) communicates with the seventh end (E2), the sixth end (C2) communicates with the eighth end (S2), and control the third control valve (53) to open, and at the same time control the fourth control valve (54) to close.

14. The control method of the multi-connected air conditioner system according to claim 8, characterized in that: When heat storage is required, open the second throttling device (72), and at the same time control the first control valve (51) to open and / or control the second control valve (52) to open.

15. The control method of the multi-connected air conditioner system according to claim 14, characterized in that: When the heating demand of the indoor unit is less than the preset value, control the first four-way valve (41) so that the first end (D1) communicates with the third end (E1), the second end (C1) communicates with the fourth end (S1), control the second four-way valve (42) so that the fifth end (D2) communicates with the seventh end (E2), the sixth end (C2) communicates with the eighth end (S2), and control the first control valve (51) to open, and at the same time control the second control valve (52) to open; When the heating demand of the indoor unit is greater than a preset value, control the first four-way valve (41) to connect the first end (D1) to the third end (E1) and the second end (C1) to the fourth end (S1), control the second four-way valve (42) to connect the fifth end (D2) to the seventh end (E2) and the sixth end (C2) to the eighth end (S2), and control the first control valve (51) to open while controlling the second control valve (52) to close.

16. The control method of the multi-connected air conditioner system according to claim 8, characterized in that: When defrosting with heat storage is required, open the second throttling device (72), control the first four-way valve (41) to connect the first end (D1) to the second end (C1) and the third end (E1) to the fourth end (S1), and the second four-way valve (42) to connect the fifth end (D2) to the sixth end (C2) and the seventh end (E2) to the eighth end (S2); Control the first control valve (51) to open while controlling the second control valve (52) to close.

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