A multi-split air conditioning system and a control method thereof

Abstract

The present disclosure provides a multi-split air conditioning system and a control method thereof, comprising 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 all communicated between the indoor side and the outdoor side, and the first gas side pipe is communicated with the exhaust end of the compressor; further comprising at least one indoor unit, at least one heat storage module, at least one constant temperature dehumidification indoor unit, at least one hot water module, at least one floor heating module, and a photovoltaic module capable of absorbing solar energy and generating electric energy for supply to the multi-split air conditioning system. According to the present disclosure, the effects of constant temperature dehumidification, heat storage defrosting, air conditioning demand, floor heating demand, domestic hot water demand and photovoltaic application can be realized simultaneously through a set of system, the actual needs of users are solved, and each module can be selected to be connected to the system or not according to actual needs.

Description

Technical Field

[0001] This disclosure relates to the field of multi-split air conditioning technology, specifically to a multi-split air conditioning system and its control method. Background Technology

[0002] China is a vast country with diverse climates, resulting in varying functional requirements for air conditioning products among consumers in different regions. For example, in the south, cooling is the primary concern; in the north, heating and underfloor heating are more important; during the rainy season in the Yangtze River basin, constant temperature and dehumidification functions are highly valued; and in the Northwest, where solar energy resources are abundant, photovoltaic air conditioning systems are the optimal solution. However, integrating all functions into a single design would result in a complex and costly system to meet all these needs.

[0003] Currently, there is no air conditioning system on the market that can integrate air conditioning modules, underfloor heating modules, domestic hot water modules, constant temperature dehumidification modules, heat storage defrosting modules, and photovoltaic modules, while simultaneously fulfilling the needs of constant temperature dehumidification, heat storage defrosting, air conditioning, underfloor heating, domestic hot water, and photovoltaic applications.

[0004] Patent CN 210832379 U discloses an air conditioning system that integrates cooling, heating and floor heating functions. Although this system can achieve cooling, heating, constant temperature dehumidification and floor heating functions, it cannot solve the need for hot water production, and the functions of heat storage defrosting and photovoltaics cannot be realized.

[0005] Patent CN104296415A discloses a system that can freely match the demand for air conditioning and hot water according to user needs, but this system cannot perform other functions.

[0006] Because existing modular full-function multi-split air conditioning systems cannot simultaneously achieve constant temperature dehumidification, heat storage defrosting, air conditioning, underfloor heating, domestic hot water, and photovoltaic applications, this disclosure studies and designs a multi-split air conditioning system and its control method.

[0007] Public content

[0008] Therefore, the technical problem to be solved by this disclosure is to overcome the shortcomings of existing multi-split air conditioning systems that cannot simultaneously achieve constant temperature dehumidification, heat storage defrosting, air conditioning demand, underfloor heating demand, domestic hot water demand and photovoltaic application, thereby providing a multi-split air conditioning system and its control method.

[0009] To address the aforementioned problems, this disclosure provides a multi-split air conditioning system, comprising:

[0010] The system includes 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 all connected between the indoor and outdoor sides, respectively. The first gas-side pipe is connected to the exhaust end of the compressor.

[0011] It also includes at least one indoor unit, which is disposed between the second gas-side pipe and the liquid-side pipe;

[0012] It also includes at least one heat storage module, which is disposed between the second gas-side pipe and the liquid-side pipe;

[0013] It also includes at least one constant temperature dehumidifying indoor unit, wherein the constant temperature dehumidifying indoor unit is disposed between the first air-side pipe and the liquid-side pipe, and / or the constant temperature dehumidifying indoor unit is disposed between the second air-side pipe and the liquid-side pipe;

[0014] It also includes at least one hot water module, which is disposed between the first gas-side pipe and the liquid-side pipe, and / or the hot water module is disposed between the second gas-side pipe and the liquid-side pipe;

[0015] It also includes at least one floor heating module, the floor heating module including a heat exchange component, the heat exchange component being connected between the first gas-side pipe and the liquid-side pipe, and refrigerant being able to flow in the heat exchange component to exchange heat for floor heating;

[0016] It also includes a photovoltaic module, which can absorb solar energy and generate electricity to supply the multi-split air conditioning system.

[0017] In some embodiments, the indoor unit includes an indoor heat exchanger and indoor unit piping, wherein the indoor heat exchanger and a first throttling device are disposed on the indoor unit piping.

[0018] In some embodiments, the heat storage module includes a heat storage device and a heat storage pipeline, wherein the heat storage device and a second throttling device are disposed on the heat storage pipeline.

[0019] In some embodiments, the constant temperature dehumidification indoor unit includes a first heat exchanger and a second heat exchanger. The first heat exchanger is disposed on a third pipeline, one end of which is connected to the second gas-side pipe and the other end of which is connected to the liquid-side pipe. The second heat exchanger is disposed on a fourth pipeline, one end of which is connected to the first gas-side pipe and the other end of which is connected to the liquid-side pipe.

[0020] In some embodiments, a third throttling device is also provided on the third pipeline, and a fourth throttling device is also provided on the fourth pipeline.

[0021] In some embodiments, the hot water module includes a water tank and a fifth pipeline. The water tank is disposed on the fifth pipeline, and one end of the fifth pipeline is connected to the liquid-side pipe, the other end is connected to the first gas-side pipe through a sixth pipeline, and the other end of the fifth pipeline is also connected to the second gas-side pipe through a seventh pipeline.

[0022] In some embodiments, a fifth throttling device is provided on the fifth pipeline, a first control valve is provided on the sixth pipeline, and a second control valve is provided on the seventh pipeline; and / or, a first check valve is provided on the sixth pipeline that only allows fluid to flow from the first gas-side pipe to the fifth pipeline, and a second check valve is provided on the seventh pipeline that only allows fluid to flow from the fifth pipeline to the second gas-side pipe.

[0023] In some embodiments, the heat exchange component has a capillary structure, the capillary is connected to the liquid-side pipe through an eighth pipe, the capillary is connected to the first gas-side pipe through a ninth pipe, a sixth throttling device is provided on the eighth pipe or the ninth pipe, and a third control valve is provided on the ninth pipe or the eighth pipe.

[0024] In some embodiments, the photovoltaic module includes a solar panel, a combiner, and a photovoltaic inverter. The solar panel absorbs solar energy, which then passes through the combiner and the photovoltaic inverter to supply power to the outdoor unit of the multi-split air conditioning system.

[0025] In some embodiments, a first four-way valve and a second four-way valve are also included, wherein a first end of the first four-way valve is connected to a fifth end of the second four-way valve and together they are connected to the discharge end of the compressor;

[0026] The sixth end of the second four-way valve is connected to the outdoor heat exchanger, and the other end of the outdoor heat exchanger can be connected to the first gas-side pipe.

[0027] The third end of the first four-way valve is connected to the second gas-side pipe;

[0028] The second and fourth ends of the first four-way valve are connected to the seventh and eighth ends of the second four-way valve, and together they are connected to the suction end of the compressor.

[0029] This disclosure also provides a control method for a multi-split air conditioning system as described in any of the preceding claims, which, when simultaneously including a first four-way valve, a second four-way valve, a first throttling device and a second throttling device, a third throttling device and a fourth throttling device, a fifth throttling device and a sixth throttling device, and a first control valve, a second control valve and a third control valve, achieves mode control of at least one of cooling, heating, hot water production, heating, heat storage and dehumidification of the indoor unit 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 sixth throttling device, and the first control valve, the second control valve and the third control valve.

[0030] In some implementations, when refrigeration is required, the first throttling device is opened, and the first four-way valve is controlled to connect the first end to the second end and the third end to the fourth end; the second four-way valve is controlled to connect the fifth end to the sixth end and the seventh end to the eighth end.

[0031] In some implementations, when heating is required, the first throttling device is opened, and the first four-way valve is controlled to connect the first end to the third end and the second end to the fourth end; the second four-way valve is controlled to connect the fifth end to the seventh end and the sixth end to the eighth end.

[0032] In some implementations, when constant temperature dehumidification is required, the third throttling device and / or the fourth throttling device are opened, while the first four-way valve is controlled to connect the first end with the second end and the third end with the fourth end.

[0033] In some implementations, when hot water needs to be produced, the fifth throttling device is opened, and the second four-way valve is controlled to connect the fifth end with the seventh end and the sixth end with the eighth end.

[0034] In some implementations, when underfloor heating is required, the sixth throttling device is opened, and the second four-way valve is controlled to connect the fifth end with the seventh end and the sixth end with the eighth end.

[0035] The multi-split air conditioning system and its control method disclosed herein have the following beneficial effects:

[0036] The multi-split air conditioning system disclosed herein comprises a compressor, outdoor heat exchanger, subcooler, ordinary indoor unit, constant temperature and dehumidification module, heat storage module, hot water module, underfloor heating module, and photovoltaic module. A single system can simultaneously achieve constant temperature and dehumidification, heat storage and defrosting, air conditioning, underfloor heating, domestic hot water, and photovoltaic applications, addressing diverse user needs. Each module can be selectively connected to the system based on actual requirements, without affecting other already connected functional modules. This modular, full-function air conditioning system can meet the needs of users in different regions without requiring the installation of multiple systems simultaneously, allowing for flexible combinations of various functions. This system maximizes cost savings for users while meeting their needs, offering convenient and flexible installation and comfortable operation. Furthermore, this system allows for the free combination of specific indoor units and modules to simultaneously achieve constant temperature and dehumidification, heat storage and defrosting, and photovoltaic functions, based on user requirements. Furthermore, by setting the heat exchange components of the underfloor heating module to a capillary structure, it can be directly connected to the refrigerant pipeline and provide underfloor heating through the refrigerant in the capillary tube. This can relatively improve the heat exchange efficiency compared to hot water heating, thereby improving the indoor heating effect and increasing comfort. Attached Figure Description

[0037] Figure 1 This is a publicly disclosed system structure diagram of a multi-split air conditioning unit;

[0038] Figure 2 This is a schematic diagram showing the connection between the photovoltaic module and the outdoor unit in a multi-split air conditioner.

[0039] The reference numerals in the attached figures are as follows:

[0040] 1. Compressor; 1a. Discharge end; 1b. Intake 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; 55. First check valve; 56. Second check valve; 57. Third check valve; 58. Fourth check valve; 61. Indoor unit; 611. Indoor heat exchanger; 62. Heat storage module; 621. Heat storage unit; 63. Constant temperature 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; 76. Sixth throttling device; 8. Hot water module; 81. Water tank; 9. Underfloor heating module; 91. Heat exchange component; 10. Photovoltaic module; 10a. Solar panel; 10b. Combiner; 10c. Photovoltaic inverter; 151. First large valve; 152. Second large valve; 153. Small valve; 101. Indoor unit piping; 102. Heat storage piping; 103. Third piping; 104. Fourth piping; 105. Fifth piping; 106. Sixth piping; 107. Seventh piping; 108. Eighth piping; 109. Ninth piping; 11. Outdoor unit. Detailed Implementation

[0041] like Figure 1-2 As shown, this disclosure provides a multi-split air conditioning system, which includes:

[0042] The compressor 1, outdoor heat exchanger 2, first gas-side pipe 31, second gas-side pipe 32 and 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;

[0043] It also includes at least one indoor unit 61, which is disposed between the second gas-side pipe 32 and the liquid-side pipe 33;

[0044] It also includes at least one heat storage module 62, which is disposed between the second gas-side pipe 32 and the liquid-side pipe 33;

[0045] It also includes at least one constant temperature dehumidifying indoor unit 63, which is disposed between the first air-side pipe 31 and the liquid-side pipe 33, and / or the constant temperature dehumidifying indoor unit 63 is disposed between the second air-side pipe 32 and the liquid-side pipe 33;

[0046] It also includes at least one hot water module 8, which is disposed between the first gas-side pipe 31 and the liquid-side pipe 33, and / or the hot water module 8 is disposed between the second gas-side pipe 32 and the liquid-side pipe 33;

[0047] It also includes at least one floor heating module 9, which includes a heat exchange component 91. The heat exchange component 91 is connected between the first gas-side pipe 31 and the liquid-side pipe 33, and refrigerant can flow in the heat exchange component 91 to exchange heat and supply floor heating.

[0048] It also includes a photovoltaic module 10, which is capable of absorbing solar energy and generating electrical energy to supply the multi-split air conditioning system.

[0049] The multi-split air conditioning system disclosed herein comprises a compressor, outdoor heat exchanger, subcooler, ordinary indoor unit, constant temperature and dehumidification module, heat storage module, hot water module, underfloor heating module, and photovoltaic module. A single system can simultaneously achieve constant temperature and dehumidification, heat storage and defrosting, air conditioning, underfloor heating, domestic hot water, and photovoltaic applications, addressing diverse user needs. Each module can be selectively connected to the system based on actual requirements, without affecting other already connected functional modules. This modular, full-function air conditioning system can meet the needs of users in different regions without requiring the installation of multiple systems simultaneously, allowing for flexible combinations of various functions. This system maximizes cost savings for users while meeting their needs, offering convenient and flexible installation and comfortable operation. Furthermore, this system allows for the free combination of specific indoor units and modules to simultaneously achieve constant temperature and dehumidification, heat storage and defrosting, and photovoltaic functions, based on user requirements. Furthermore, by setting the heat exchange components of the underfloor heating module to a capillary structure, it can be directly connected to the refrigerant pipeline and provide underfloor heating through the refrigerant in the capillary tube. This can relatively improve the heat exchange efficiency compared to hot water heating, thereby improving the indoor heating effect and increasing comfort.

[0050] 1. Standard cooling and heating function module

[0051] In some embodiments, the indoor unit 61 includes an indoor heat exchanger 611 and an indoor unit pipeline 101, wherein the indoor heat exchanger 611 and a first throttling device 71 are disposed on the indoor unit pipeline 101.

[0052] After being discharged from the compressor, the high-temperature, high-pressure gas passes through the oil separator, the second four-way valve 42, and the outdoor heat exchanger, becoming a medium-pressure, low-temperature liquid. It then enters the ordinary indoor unit through a small valve on the liquid side pipe, where it is throttled and evaporates to absorb heat on the indoor side for cooling. Finally, it flows through the second large valve 152 and the first four-way valve 41 into the vapor-liquid separator, returning to the compressor. When the first four-way valve 41 and the second four-way valve 42 are energized and reversed, the ordinary indoor unit begins heating.

[0053] 2. Heat storage defrosting module

[0054] In some embodiments, the heat storage module 62 includes a heat storage device 621 and a heat storage pipeline 102, wherein the heat storage device 621 and a second throttling device 72 are provided on the heat storage pipeline 102.

[0055] The heat storage defrosting module is only used when the system is in heating mode. When the system is in cooling or other modes, the valve of the heat storage defrosting module is closed. When the system is in heating mode, the refrigerant flow is the same as in a regular heating indoor unit. By adjusting the opening of the electronic expansion valve in the heat storage defrosting module, heat is stored in the module without affecting the heating performance of other indoor units. When the outdoor unit needs defrosting, the valve of the regular heating indoor unit is closed, and the heat storage defrosting module provides heat for defrosting. Defrosting does not draw heat from the indoor unit, improving indoor comfort.

[0056] The heat storage defrosting module can be installed selectively. If the main controller of the air conditioning system detects that no heat storage defrosting module is connected to the system, the system will perform normal indoor unit defrosting during defrosting. When a heat storage defrosting module is detected, the system will operate according to the predetermined heat storage defrosting control logic, and will perform heat storage defrosting during defrosting. If the heat storage defrosting fails and cannot complete defrosting, the system will then perform normal indoor unit defrosting.

[0057] 3. Constant temperature and dehumidification module

[0058] In some embodiments, the constant temperature dehumidification indoor unit 63 includes a first heat exchanger 631 and a second heat exchanger 632. The first heat exchanger 631 is disposed on a third pipe 103, one end of which is connected to the second gas-side pipe 32 and the other end of which is connected to the liquid-side pipe 33. The second heat exchanger 632 is disposed on a fourth pipe 104, one end of which is connected to the first gas-side pipe 31 and the other end of which is connected to the liquid-side pipe 33.

[0059] After the high-temperature, high-pressure gas is discharged from the compressor, it passes through an oil separator and splits 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, low-temperature liquid. It then passes through a small valve on the liquid side pipe into the constant temperature dehumidification module. After being throttled by the third throttling device 73, it evaporates and absorbs heat in the first heat exchanger 631, thus cooling the first heat exchanger 631. The second path directly passes through the first large valve 151 on the gas side pipe (high pressure) into the constant temperature dehumidification module, where it condenses and releases heat in the second heat exchanger 632. After passing through the fourth throttling device 74, it merges with the first path of refrigerant that entered the third throttling device 73, where it evaporates and absorbs heat in the first heat exchanger 631.

[0060] After the two air streams merge into one, they flow through the second large valve 152 and the first four-way valve 41 into the vapor-liquid separator, returning to the compressor. In conventional condensation dehumidification systems, the air temperature decreases simultaneously with dehumidification. This lower outlet air temperature reduces user comfort. High-temperature (medium-temperature) and high-humidity air, when flowing through the constant-temperature dehumidification module, is first dehumidified and cooled at the first heat exchanger 631, and then heated at the second heat exchanger 632. This ensures that the outlet air temperature and humidity remain within a comfortable range, improving the user experience.

[0061] When the constant temperature dehumidification module needs heating, the first four-way valve 41 and the second four-way valve 42 are energized and reversed. The refrigerant in the first heat exchanger 631 flows in the same direction as the refrigerant in a regular cooling / heating indoor unit. After condensing and releasing heat in the first heat exchanger 631, it merges with the refrigerant condensing and releasing heat in the second heat exchanger 632, and then returns to the outdoor heat exchanger for evaporation through the liquid-side pipe, before returning to the compressor. Compared to heating in a regular indoor unit, the constant temperature dehumidification module has a better heating effect because it has two heat exchangers.

[0062] When the system detects a constant temperature and dehumidification module connected, the air conditioning system's main controller executes the constant temperature and dehumidification function according to the user-defined mode requirements. If the system does not have this module connected, this function is unavailable and cannot be configured by the user. This has no impact on other functions connected to the system; other functions will continue to operate normally.

[0063] In some embodiments, a third throttling device 73 is also provided on the third pipeline 103, and a fourth throttling device 74 is also provided on the fourth pipeline 104.

[0064] 4. Hot water module

[0065] In some embodiments, the hot water module 8 includes a water tank 81 and a fifth pipe 105. The water tank 81 is disposed on the fifth pipe 105, and one end of the fifth pipe 105 is connected to the liquid side pipe 33, and the other end is connected to the first gas side pipe 31 through a sixth pipe 106. The other end of the fifth pipe 105 is also connected to the second gas side pipe 32 through a seventh pipe 107.

[0066] This system can provide domestic hot water regardless of the operating mode. High-temperature, high-pressure gas is discharged from the compressor, passes through an oil separator, and enters the domestic hot water module through the first large valve 151 on the gas side pipe (high pressure). It then passes through solenoid valve A into the water tank to heat the domestic hot water.

[0067] (1) The system only requires hot water. After heating the hot water, the refrigerant goes through the small valve on the liquid side pipe to the outdoor unit heat exchanger to evaporate and absorb heat, and then returns to the compressor through the four-way valve.

[0068] (2) The system has both cooling and hot water requirements. After heating the hot water, the refrigerant evaporates and absorbs heat in the indoor unit where cooling is required, and then returns to the compressor. Alternatively, it can evaporate and absorb heat together in the indoor and outdoor heat exchangers, and then return to the compressor (the choice of method can be determined based on the total demand for hot water and cooling).

[0069] (3) The system has heating and hot water production needs. The high-temperature and high-pressure refrigerant discharged from the compressor goes partly to the hot water module to heat the hot water, and partly to the indoor side to condense and release heat. Then it returns to the outdoor unit to evaporate and return to the compressor.

[0070] When a hot water module is connected to the system, the air conditioning system's main controller executes the hot water function based on the user's set hot water temperature and volume requirements. If no hot water module is connected, this function is not available, but it does not affect other functions connected to the system, which can operate normally.

[0071] 5. Underfloor heating module

[0072] In some embodiments, the heat exchange component 91 has a capillary structure, the capillary is connected to the liquid side pipe 33 through an eighth pipe 108, the capillary is connected to the first gas side pipe 31 through a ninth pipe 109, a sixth throttling device 76 is provided on the eighth pipe 108 or the ninth pipe 109, and a third control valve 53 is provided on the ninth pipe 109 or the eighth pipe 108.

[0073] The operation of the underfloor heating module is the same as that of the domestic hot water system, and the detection, connection, and implementation processes are also the same.

[0074] In some embodiments, the photovoltaic module 10 includes a solar panel 10a, a combiner 10b, and a photovoltaic inverter 10c. The solar panel 10a absorbs solar energy, which then passes through the combiner 10b and the photovoltaic inverter 10c to supply power to the outdoor unit of the multi-split air conditioning system.

[0075] 6. Photovoltaic modules

[0076] This system can also be directly connected to an external (or internal) photovoltaic inverter to power the air conditioning system using the electricity generated by the solar panels, provided that the ambient light conditions permit, thus achieving clean and energy-saving operation.

[0077] The above Figure 2 This is for illustrative purposes only. The outdoor unit configuration is not limited to the one shown in the diagram. Currently, the photovoltaic inverter function is only for external connection; however, this function can also be directly added to the electrical control box of the air conditioning system. The system directly detects the connection status of the photovoltaic modules to determine the system's power supply and operating mode.

[0078] When photovoltaic (PV) modules are connected to the system, the air conditioning system's main controller supplies power to the system based on external sunlight conditions and the amount of electricity generated. (If the electricity generated by the PV modules is equal to or greater than the electricity required for the air conditioning system to operate, the PV modules will supply all the electricity needed for system operation, with any excess electricity fed to the mains power. If the electricity generated by the PV modules is less than the electricity required for the air conditioning system to operate, the PV modules and the mains power will jointly supply the electricity needed for system operation, with priority given to PV power.) If no PV modules are connected to the system, the entire system will be powered by the mains power. This has no impact on other functions connected to the system, which will continue to function normally.

[0079] In this modular full-function air conditioning system, all six modules can be freely selected to achieve different functions.

[0080] In some embodiments, a first four-way valve 41 and a second four-way valve 42 are also included, 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 together they are connected to the exhaust end 1a of the compressor 1.

[0081] 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.

[0082] The third end E1 of the first four-way valve 41 is connected to the second gas-side pipe 32;

[0083] The second end C1 and the fourth end S1 of the first four-way valve 41 are connected to the seventh end E2 and the eighth end S2 of the second four-way valve 42, and together they are connected to the suction end 1b of the compressor 1.

[0084] In some embodiments, when a first control valve 51 and a 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 a third control valve 53 and a 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.

[0085] This disclosure also provides a control method for a multi-split air conditioning system as described in any of the preceding claims, which, when simultaneously including a first four-way valve 41, a second four-way valve 42, a first throttling device 71 and a second throttling device 72, a third throttling device 73 and a fourth throttling device 74, a fifth throttling device 75 and a sixth throttling device 76, and a first control valve 51, a second control valve 52 and a third control valve 53, achieves at least one of the following modes of indoor cooling, heating, hot water production, heat supply, heat storage and dehumidification 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 and the fourth throttling device 74, the fifth throttling device 75 and the sixth throttling device 76, and the first control valve 51, the second control valve 52 and the third control valve 53.

[0086] In some implementations, when refrigeration is required, the first throttling device 71 is opened, and the first four-way valve 41 is controlled to connect the first end D1 with the second end C1 and the third end E1 with the fourth end S1; the second four-way valve 42 is controlled to connect the fifth end D2 with the sixth end C2 and the seventh end E2 with the eighth end S2.

[0087] 1. Standard cooling and heating function module

[0088] In some implementations, when heating is required, the first throttling device 71 is opened, and the first four-way valve 41 is controlled to connect the first end D1 with the third end E1 and the second end C1 with the fourth end S1; the second four-way valve 42 is controlled to connect the fifth end D2 with the seventh end E2 and the sixth end C2 with the eighth end S2.

[0089] After being discharged from the compressor, the high-temperature, high-pressure gas passes through the oil separator, the second four-way valve 42, and the outdoor heat exchanger, becoming a medium-pressure, low-temperature liquid. It then enters the ordinary indoor unit through a small valve on the liquid side pipe, where it is throttled and evaporates to absorb heat on the indoor side for cooling. Finally, it flows through the second large valve 152 and the first four-way valve 41 into the vapor-liquid separator, returning to the compressor. When the first four-way valve 41 and the second four-way valve 42 are energized and reversed, the ordinary indoor unit begins heating.

[0090] 2. Constant temperature and dehumidification module

[0091] In some implementations, when constant temperature dehumidification is required, the third throttling device 73 and / or the fourth throttling device 74 are opened, and the first four-way valve 41 is controlled to connect the first end D1 with the second end C1 and the third end E1 with the fourth end S1.

[0092] After the high-temperature, high-pressure gas is discharged from the compressor, it passes through an oil separator and splits 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, low-temperature liquid. It then passes through a small valve on the liquid side pipe into the constant temperature dehumidification module. After being throttled by the third throttling device 73, it evaporates and absorbs heat in the first heat exchanger 631, thus cooling the first heat exchanger 631. The second path directly passes through the first large valve 151 on the gas side pipe (high pressure) into the constant temperature dehumidification module, where it condenses and releases heat in the second heat exchanger 632. After passing through the fourth throttling device 74, it merges with the first path of refrigerant that entered the third throttling device 73, where it evaporates and absorbs heat in the first heat exchanger 631.

[0093] After the two air streams merge into one, they flow through the second large valve 152 and the first four-way valve 41 into the vapor-liquid separator, returning to the compressor. In conventional condensation dehumidification systems, the air temperature decreases simultaneously with dehumidification. This lower outlet air temperature reduces user comfort. High-temperature (medium-temperature) and high-humidity air, when flowing through the constant-temperature dehumidification module, is first dehumidified and cooled at the first heat exchanger 631, and then heated at the second heat exchanger 632. This ensures that the outlet air temperature and humidity remain within a comfortable range, improving the user experience.

[0094] When the constant temperature dehumidification module needs heating, the first four-way valve 41 and the second four-way valve 42 are energized and reversed. The refrigerant in the first heat exchanger 631 flows in the same direction as the refrigerant in a regular cooling / heating indoor unit. After condensing and releasing heat in the first heat exchanger 631, it merges with the refrigerant condensing and releasing heat in the second heat exchanger 632, and then returns to the outdoor heat exchanger for evaporation through the liquid-side pipe, before returning to the compressor. Compared to heating in a regular indoor unit, the constant temperature dehumidification module has a better heating effect because it has two heat exchangers.

[0095] When the system detects a constant temperature and dehumidification module connected, the air conditioning system's main controller executes the constant temperature and dehumidification function according to the user-defined mode requirements. If the system does not have this module connected, this function is unavailable and cannot be configured by the user. This has no impact on other functions connected to the system; other functions will continue to operate normally.

[0096] In some implementations, when hot water needs to be produced, the fifth throttling device 75 is opened, and the second four-way valve 42 is controlled to connect the fifth terminal D2 with the seventh terminal E2 and the sixth terminal C2 with the eighth terminal S2.

[0097] 3. Hot water module

[0098] This system can provide domestic hot water regardless of the operating mode. High-temperature, high-pressure gas, after being discharged from the compressor, passes through an oil separator and enters the domestic hot water module through the first large valve 151 on the gas side pipe (high pressure). It then passes through the first control valve 51 (solenoid valve A) to enter the water tank for heating domestic hot water.

[0099] (1) The system only requires hot water. After heating the hot water, the refrigerant goes through the small valve on the liquid side pipe to the outdoor unit heat exchanger to evaporate and absorb heat, and then returns to the compressor through the four-way valve.

[0100] (2) The system has both cooling and hot water requirements. After heating the hot water, the refrigerant evaporates and absorbs heat in the indoor unit where cooling is required, and then returns to the compressor. Alternatively, it can evaporate and absorb heat together in the indoor and outdoor heat exchangers, and then return to the compressor (the choice of method can be determined based on the total demand for hot water and cooling).

[0101] (3) The system has heating and hot water production needs. The high-temperature and high-pressure refrigerant discharged from the compressor goes partly to the hot water module to heat the hot water, and partly to the indoor side to condense and release heat. Then it returns to the outdoor unit to evaporate and return to the compressor.

[0102] When a hot water module is connected to the system, the air conditioning system's main controller executes the hot water function based on the user's set hot water temperature and volume requirements. If no hot water module is connected, this function is not available, but it does not affect other functions connected to the system, which can operate normally.

[0103] In some implementations, when underfloor heating is required, the sixth throttling device 76 is opened, and the second four-way valve 42 is controlled to connect the fifth terminal D2 with the seventh terminal E2 and the sixth terminal C2 with the eighth terminal S2.

[0104] 4. Underfloor heating module

[0105] The capillary network underfloor heating module is only available during heating operation. When the unit is in cooling operation, the third control valve 53 (solenoid valve C) and the sixth throttling device 76 are closed to ensure that refrigerant does not accumulate in the capillary network underfloor heating system. When the system is in heating operation, underfloor heating and air conditioning heating can be selected. If the capillary network underfloor heating is in operation, the solenoid valve C is open, and the high-temperature, high-pressure refrigerant flows into the capillary tube to release heat. Then, it is throttled by the sixth throttling device 76, passes through a small valve to the outdoor unit for evaporation and heat absorption, and then returns to the compressor.

[0106] 5. Heat storage defrosting module

[0107] The heat storage defrosting module is only used when the system is in heating mode. When the system is in cooling or other modes, the valve of the heat storage defrosting module is closed. When the system is in heating mode, the refrigerant flow is the same as in a regular heating indoor unit. By adjusting the opening of the electronic expansion valve in the heat storage defrosting module, heat is stored in the module without affecting the heating performance of other indoor units. When the outdoor unit needs defrosting, the valve of the regular heating indoor unit is closed, and the heat storage defrosting module provides heat for defrosting. Defrosting does not draw heat from the indoor unit, improving indoor comfort.

[0108] The heat storage defrosting module can be installed selectively. If the main controller of the air conditioning system detects that no heat storage defrosting module is connected to the system, the system will perform normal indoor unit defrosting during defrosting. When a heat storage defrosting module is detected, the system will operate according to the predetermined heat storage defrosting control logic, and will perform heat storage defrosting during defrosting. If the heat storage defrosting fails and cannot complete defrosting, the system will then perform normal indoor unit defrosting.

[0109] 6. Photovoltaic modules

[0110] This system can also be directly connected to an external (or internal) photovoltaic inverter to power the air conditioning system using the electricity generated by the solar panels, provided that the ambient light conditions permit, thus achieving clean and energy-saving operation.

[0111] The above Figure 2 This is for illustrative purposes only. The outdoor unit configuration is not limited to the one shown in the diagram. Currently, the photovoltaic inverter function is only for external connection; however, this function can also be directly added to the electrical control box of the air conditioning system. The system directly detects the connection status of the photovoltaic modules to determine the system's power supply and operating mode.

[0112] When photovoltaic (PV) modules are connected to the system, the air conditioning system's main controller supplies power to the system based on external sunlight conditions and the amount of electricity generated. (If the electricity generated by the PV modules is equal to or greater than the electricity required for the air conditioning system to operate, the PV modules will supply all the electricity needed for system operation, with any excess electricity fed to the mains power. If the electricity generated by the PV modules is less than the electricity required for the air conditioning system to operate, the PV modules and the mains power will jointly supply the electricity needed for system operation, with priority given to PV power.) If no PV modules are connected to the system, the entire system will be powered by the mains power. This has no impact on other functions connected to the system, which will continue to function normally.

[0113] In this modular full-function air conditioning system, all six modules can be freely selected to achieve different functions.

[0114] 1. This disclosure can solve a system that simultaneously has the functions of air conditioning, heating, underfloor heating and domestic hot water. When this module is connected, the system main controller can automatically detect and execute according to the connected module. When the system is not connected to this module, it will not affect the implementation of other functions, and other systems can be implemented normally.

[0115] 2. This disclosure also allows for the free combination of specific indoor units and modules according to user needs to achieve constant temperature dehumidification, heat storage defrosting, and photovoltaic functions.

[0116] The modular, full-function air conditioning system disclosed herein can meet the needs of users in different regions without requiring the simultaneous installation of multiple systems. It allows for flexible combination and configuration of various functions. This system can save users maximum costs while meeting their needs, and is convenient, flexible to install, and comfortable to use.

[0117] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure. The above description is only a preferred embodiment of this disclosure. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this disclosure, and these improvements and modifications should also be considered within the protection scope of this disclosure.

Claims

1. A multi-split air conditioning system, characterized in that: include: The compressor (1), outdoor heat exchanger (2), first gas-side pipe (31), second gas-side pipe (32) and liquid-side pipe (33) are respectively connected between the indoor side and the outdoor side. The first gas-side pipe (31) is connected to the exhaust end (1a) of the compressor (1). It also includes at least one indoor unit (61), which is connected between the second gas-side pipe (32) and the liquid-side pipe (33); It also includes at least one heat storage module (62), which is connected and disposed between the second gas-side pipe (32) and the liquid-side pipe (33); It also includes at least one constant temperature dehumidifying indoor unit (63), which is connected between the first air-side pipe (31) and the liquid-side pipe (33), and / or the constant temperature dehumidifying indoor unit (63) is connected between the second air-side pipe (32) and the liquid-side pipe (33); It also includes at least one hot water module (8), which is connected between the first gas-side pipe (31) and the liquid-side pipe (33), and / or the hot water module (8) is connected between the second gas-side pipe (32) and the liquid-side pipe (33); It also includes at least one floor heating module (9), the floor heating module (9) includes a heat exchange component (91), the heat exchange component (91) is connected between the first gas side pipe (31) and the liquid side pipe (33), and refrigerant can flow in the heat exchange component (91) to exchange heat for floor heating; It also includes a photovoltaic module (10), which is capable of absorbing solar energy and generating electrical energy to supply the multi-split air conditioning system; The hot water module (8) includes a water tank (81) and a fifth pipeline (105). The water tank (81) is installed on the 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 first gas side pipe (31) through the sixth pipeline (106). The other end of the fifth pipeline (105) is also connected to the second gas side pipe (32) through the seventh pipeline (107). The fifth pipeline (105) is provided with a fifth throttling device (75), the sixth pipeline (106) is also provided with a first control valve (51), and the seventh pipeline (107) is also provided with a second control valve (52); the sixth pipeline (106) is also provided with a first check valve (55) that only allows fluid to flow from the first gas-side pipe (31) to the fifth pipeline (105), and the seventh pipeline (107) is also provided with a second check valve (56) that only allows fluid to flow from the fifth pipeline (105) to the second gas-side pipe (32); If the system only requires hot water, the first control valve (51) is opened and the second control valve (52) is closed. After heating the hot water, the refrigerant passes through the small valve on the liquid side pipe to the outdoor unit heat exchanger to evaporate and absorb heat, and then returns to the compressor through the four-way valve. If there is a demand for both cooling and hot water production in the system, the first control valve (51) opens and the second control valve (52) closes. After heating the hot water, the refrigerant evaporates and absorbs heat in the indoor unit where the cooling demand is met, and then returns to the compressor. Alternatively, it can evaporate and absorb heat together in the indoor heat exchanger and the outdoor heat exchanger, and then return to the compressor. The choice of which method to use depends on the total demand for both hot water production and cooling. If there is a demand for heating and hot water in the system, the first control valve (51) opens and the second control valve (52) opens. The high-temperature and high-pressure refrigerant discharged from the compressor goes partly to the hot water module to heat the hot water, partly to the indoor side to condense and release heat, and then returns to the outdoor unit to evaporate and return to the compressor.

2. The multi-split air conditioning system according to claim 1, characterized in that: The indoor unit (61) includes an indoor heat exchanger (611) and an indoor unit pipeline (101), on which the indoor heat exchanger (611) and a first throttling device (71) are installed.

3. The multi-split air conditioning system according to claim 1, characterized in that: The heat storage module (62) includes a heat storage device (621) and a heat storage pipeline (102), and the heat storage pipeline (102) is provided with the heat storage device (621) and a second throttling device (72).

4. The multi-split air conditioning system according to claim 1, characterized in that: The constant temperature dehumidification indoor unit (63) includes a first heat exchanger (631) and a second heat exchanger (632). The first heat exchanger (631) is installed on a third pipeline (103). One end of the third pipeline (103) 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 installed on a fourth pipeline (104). One end of the fourth pipeline (104) is connected to the first gas-side pipe (31) and the other end is connected to the liquid-side pipe (33).

5. The multi-split air conditioning system according to claim 4, characterized in that: The third pipeline (103) is also equipped with a third throttling device (73), and the fourth pipeline (104) is also equipped with a fourth throttling device (74).

6. The multi-split air conditioning system according to claim 1, characterized in that: The heat exchange component (91) has a capillary structure. The capillary is connected to the liquid side pipe (33) through the eighth pipe (108) and to the first gas side pipe (31) through the ninth pipe (109). A sixth throttling device (76) is provided on the eighth pipe (108) or the ninth pipe (109). A third control valve (53) is provided on the ninth pipe (109) or the eighth pipe (108).

7. The multi-split air conditioning system according to claim 1, characterized in that: The photovoltaic module (10) includes a solar panel (10a), a combiner (10b), and a photovoltaic inverter (10c). The solar panel (10a) absorbs solar energy and supplies power to the outdoor unit of the multi-split air conditioning system after passing through the combiner (10b) and the photovoltaic inverter (10c) in sequence.

8. The multi-split air conditioning system according to any one of claims 1-7, characterized in that: It also 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 together they are 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) are connected to the seventh end (E2) and the eighth end (S2) of the second four-way valve (42), and together they are connected to the suction end (1b) of the compressor (1).

9. A control method for a multi-split air conditioning system as described in any one of claims 1-8, characterized in that: The indoor unit (61) includes an indoor heat exchanger (611) and an indoor unit pipeline (101), on which the indoor heat exchanger (611) and a first throttling device (71) are installed. The heat storage module (62) includes a heat storage device (621) and a heat storage pipeline (102), and the heat storage pipeline (102) is provided with the heat storage device (621) and a second throttling device (72). The third pipeline (103) is also equipped with a third throttling device (73), and the fourth pipeline (104) is also equipped with a fourth throttling device (74). The heat exchange component (91) has a capillary structure. The capillary is connected to the liquid side pipe (33) through the eighth pipe (108) and to the first gas side pipe (31) through the ninth pipe (109). A sixth throttling device (76) is provided on the eighth pipe (108) or the ninth pipe (109). A third control valve (53) is provided on the ninth pipe (109) or the eighth pipe (108). The multi-split air conditioning system also 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 together they are 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) are connected to the seventh end (E2) and the eighth end (S2) of the second four-way valve (42), and together they are connected to the suction end (1b) of the compressor (1). 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), and the sixth throttling device (76), as well as the first control valve (51), the second control valve (52), and the third control valve (53), the indoor cooling, heating, hot water production, heating, heat storage, and dehumidification modes can be controlled.

10. The control method for a multi-split air conditioning system according to claim 9, characterized in that: When refrigeration is required, the first throttling device (71) is opened, and the first four-way valve (41) is controlled to connect the first end (D1) with the second end (C1) and the third end (E1) with the fourth end (S1); the second four-way valve (42) is controlled to connect the fifth end (D2) with the sixth end (C2) and the seventh end (E2) with the eighth end (S2).

11. The control method for a multi-split air conditioning system according to claim 9, characterized in that: When heating is required, the first throttling device (71) is opened, and the first four-way valve (41) is controlled to connect the first end (D1) with the third end (E1) and the second end (C1) with the fourth end (S1); the second four-way valve (42) is controlled to connect the fifth end (D2) with the seventh end (E2) and the sixth end (C2) with the eighth end (S2).

12. The control method for a multi-split air conditioning system according to claim 9, characterized in that: When constant temperature dehumidification is required, open the third throttling device (73) and / or the fourth throttling device (74), and at the same time control the first four-way valve (41) so that the first end (D1) is connected to the second end (C1) and the third end (E1) is connected to the fourth end (S1).

13. The control method for a multi-split air conditioning system according to claim 9, characterized in that: When hot water needs to be produced, the fifth throttling device (75) is opened, and the second four-way valve (42) is controlled to connect the fifth end (D2) with the seventh end (E2) and the sixth end (C2) with the eighth end (S2).

14. The control method for a multi-split air conditioning system according to claim 9, characterized in that: When underfloor heating is required, the sixth throttling device (76) is opened, and the second four-way valve (42) is controlled to connect the fifth end (D2) with the seventh end (E2) and the sixth end (C2) with the eighth end (S2).

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