Multi-connected air conditioner and control method of multi-connected air conditioner

Abstract

The application provides a multi-connected air conditioner and a control method thereof, and relates to the technical field of air conditioners, to solve the problem that air conditioner power is affected by power tension. The multi-connected air conditioner comprises an outdoor unit, an energy storage module and multiple indoor units, the energy storage module is connected in parallel with the indoor units, a four-way valve has first, second, third and fourth ports, and can be switched between the first and second ports being conducted and the third and fourth ports being conducted, and the first and fourth ports being conducted and the second and third ports being conducted, a compressor exhaust port is connected to the first port, an outdoor heat exchanger is connected to the second port and connected to an outdoor expansion valve and a liquid shunt in sequence, a compressor outlet is connected to a high-pressure shunt, the third port is connected to a compressor air inlet and a low-pressure shunt, the fourth port is blocked, and the liquid shunt, the high-pressure shunt and the low-pressure shunt are respectively connected to the multiple indoor units and the energy storage module. The multi-connected air conditioner provided by the application can reduce the influence of air conditioner power on power tension.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more specifically, to a multi-split air conditioner and a control method for the air conditioner. Background Technology

[0002] In the residential air conditioning market, the trend has shifted from one air conditioner per household to one air conditioner per room, with an average household potentially having four or five air conditioners. This has highlighted the issue of outdoor unit installation. Fixed-split systems, where a single outdoor unit is shared, reduce installation space, and this demand is significantly increasing in cities. Additionally, in places like small and medium-sized hotels in Europe, where outdoor unit installation space is limited, fixed-split systems connect multiple indoor units to a single outdoor unit, creating demand for them as well. In particular, the demand for flexible cooling and heating air conditioners, where multiple indoor units can operate independently for both cooling and heating, is continuously growing in places like hotels.

[0003] However, the increased number of air conditioners installed leads to increased energy consumption, and if energy sources such as solar power and wind power are used, they are easily affected by weather conditions. Summary of the Invention

[0004] The first objective of this invention is to provide a multi-split air conditioner to solve the technical problem that the power output of existing air conditioners is affected by power shortages.

[0005] The multi-split air conditioner provided by the present invention includes an outdoor unit, an energy storage module, and multiple indoor units, wherein the energy storage module is connected in parallel with the indoor units;

[0006] The outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve, a liquid distributor, a high-pressure distributor, and a low-pressure distributor;

[0007] The four-way valve has a first port, a second port, a third port and a fourth port, and the four-way valve can switch between a first state in which the first port and the second port are connected and the third port and the fourth port are connected, and a second state in which the first port and the fourth port are connected and the second port and the third port are connected.

[0008] The compressor's exhaust port is connected to the first port; the outdoor heat exchanger is connected to the second port; the outdoor heat exchanger, the outdoor expansion valve, and the liquid distributor are connected in sequence; the liquid distributor connects multiple indoor units and the energy storage module; the compressor's exhaust port is also connected to the high-pressure distributor; the high-pressure distributor is also connected to multiple indoor units and the energy storage module; the third port is connected to the low-pressure distributor and the compressor's air inlet; the low-pressure distributor is also connected to the multiple indoor units and the energy storage module; and the fourth port is blocked.

[0009] The beneficial effects of the multi-split air conditioner of this invention are:

[0010] By connecting an energy storage module in parallel with the indoor unit, when the cooling or heating load is low, the outdoor unit can generate cooling or heating energy, which is stored in the energy storage module. When the cooling or heating load is high, refrigerant flows through the energy storage module, absorbing heat from or releasing heat to it. This allows the energy storage module and the outdoor unit to work together to supply cooling and heating power to the indoor unit, meeting cooling or heating needs while reducing the power consumption of the air conditioner during peak electricity usage periods. Using energy storage modules eliminates the need for a water system, enabling stable cooling even in high-temperature environments and continuous heating during defrosting.

[0011] By connecting the various ports of the four-way valve in this way, the compressor can drive the refrigerant into the energy storage module. This allows the refrigerant to circulate within the energy storage module over time, even when the outdoor heat exchanger is off. This reduces the frequency of use of the outdoor heat exchanger and also makes full use of the cooling or heating capacity of the energy storage module for future storage.

[0012] In a preferred embodiment, the energy storage module is provided with a first temperature sensor, a second temperature sensor, and a third temperature sensor in a top-to-bottom order.

[0013] By placing multiple sensors from top to bottom within the energy storage module, its temperature can be collected from different locations along the height, resulting in a more reliable temperature reading for the energy storage module.

[0014] In a preferred embodiment, the system further includes multiple gas pipe temperature sensors and multiple liquid pipe temperature sensors. Liquid pipe temperature sensors are installed on the pipes connecting the energy storage module and each indoor unit to the liquid distributor, and gas pipe temperature sensors are installed on the pipes connecting the energy storage module and each indoor unit to the high-pressure distributor and the low-pressure distributor.

[0015] By installing liquid line sensors on the pipes connecting the energy storage module and each indoor unit to the liquid distributor, the liquid temperature after passing through the expansion valve can be obtained, which helps control the opening degree of the expansion valve. Similarly, installing gas line temperature sensors allows the acquisition of the refrigerant temperature before it enters the energy storage module, thereby controlling the opening degree of the expansion valve.

[0016] The second objective of this invention is to provide a control method for a multi-split air conditioner to solve the technical problem of air conditioner power being affected by power shortages.

[0017] The second aspect of the present invention provides a control method for a multi-split air conditioner, wherein the control method is applied to the aforementioned air conditioner, and the control method includes:

[0018] The high pressure at the compressor outlet, the low pressure at the compressor inlet, the evaporation temperature, the condensation temperature, and the energy storage module temperature are obtained.

[0019] Based on the comparison between the high pressure and the preset high pressure, the comparison between the low pressure and the preset low pressure, the comparison between the temperature of the energy storage module and the evaporation temperature and the condensation temperature, and the fact that the multi-split air conditioner is in cooling or heating mode, the multi-split air conditioner is controlled to enter one of the following modes: cold storage mode, cold storage independent utilization mode, heat storage mode, and heat storage independent utilization mode.

[0020] The beneficial effects of the control method for the air conditioner of this invention are:

[0021] By obtaining the high pressure at the compressor outlet, the low pressure at the compressor inlet, the evaporation temperature, the condensation temperature, and the energy storage module temperature, and comparing these parameters, the operating status of the multi-split air conditioner can be controlled in a timely manner to reduce the air conditioning load during peak electricity consumption periods.

[0022] In a preferred embodiment, the step of controlling the multi-split air conditioner to enter one of the following modes—cold storage mode, cold storage-only utilization mode, heat storage mode, and heat storage-only utilization mode—based on a comparison of the high-pressure pressure with a preset high-pressure pressure, a low-pressure pressure with a preset low-pressure pressure, a temperature of the energy storage module with the evaporation temperature and the condensation temperature, and the multi-split air conditioner being in cooling or heating mode—includes:

[0023] When the air conditioner is in cooling mode, the outdoor fan speed, outdoor ambient temperature, and superheat of the energy storage module are obtained.

[0024] If the outdoor fan speed is the lowest outdoor fan speed, the high pressure is lower than the preset high pressure, the outdoor temperature is higher than the first preset difference of the condensing temperature, and the energy storage module temperature is greater than or equal to the second preset difference of the evaporating temperature, the multi-split air conditioner is controlled to enter the cold storage mode.

[0025] If the outdoor fan speed is the lowest outdoor fan speed, the high pressure is lower than the preset high pressure, the outdoor temperature is higher than the first preset difference of the condensing temperature, and the energy storage module temperature is less than or equal to the third preset difference of the condensing temperature, the multi-split air conditioner is controlled to enter the cold storage independent utilization mode.

[0026] If the outdoor heat exchanger of the air conditioner has excessive cooling capacity, meaning its condensing capacity is too high, the high-pressure will decrease. The outdoor fan speed being at its minimum also indicates that the outdoor heat exchanger has excessive cooling capacity, requiring only a small airflow to meet its heat exchange requirements. Comparing the energy storage module temperature with the evaporation temperature, if the energy storage module temperature is significantly higher than the evaporation temperature, it means the module can store more cooling capacity, thus entering cold storage mode. If the energy storage module temperature is lower, it means the cooling capacity can be released to provide cooling for the indoor air.

[0027] In a preferred embodiment, controlling the multi-split air conditioner to enter the cold storage mode includes:

[0028] The four-way valve is controlled to connect the outdoor heat exchanger and the compressor; the high-pressure solenoid valve connected to the energy storage module is controlled to close; and the low-pressure solenoid valve connected to the energy storage module is controlled to open.

[0029] The control of the multi-split air conditioner to enter the cold storage independent utilization mode includes:

[0030] The system controls the outdoor heat exchanger's fan to shut off, controls the outdoor expansion valve to open to its minimum opening, controls the high-pressure solenoid valve connected to the energy storage module to open, and controls the low-pressure solenoid valve connected to the energy storage module to shut off.

[0031] When entering the cold storage mode, the four-way valve connects the outdoor heat exchanger and the compressor. The refrigerant can enter the outdoor heat exchanger to absorb cold energy after being discharged from the compressor. The high-pressure solenoid valve connected to the energy storage module is closed, while the low-pressure solenoid valve is opened. When the refrigerant passes through the energy storage module, it can exchange heat with the energy storage module. Then, it returns to the compressor through the low-pressure solenoid valve connected to the energy storage module, and the cycle continues.

[0032] When entering the cold storage standalone utilization mode, the outdoor expansion valve is opened to its minimum. After the refrigerant is discharged from the compressor, the amount of refrigerant passing through the outdoor heat exchanger is minimized. Although ideally, no refrigerant should flow to the outdoor heat exchanger in this mode, a fully closed outdoor expansion valve would cause refrigerant stagnation in the outdoor heat exchanger, resulting in insufficient total circulating refrigerant. To prevent this, a small amount of refrigerant is allowed to flow to the outdoor heat exchanger. The refrigerant mainly enters the energy storage module through the high-pressure distributor and the high-pressure solenoid valve connected to the energy storage module. It absorbs cold energy from the energy storage module and then flows through the liquid distributor to the indoor units that require cooling. After cooling the indoor units, since only the low-pressure solenoid valve connected to the energy storage module is closed, the other low-pressure solenoid valves are not all closed. Therefore, the low-pressure solenoid valve connected to the corresponding indoor unit that needs cooling is opened, and the refrigerant flows out of the indoor unit, passes through the low-pressure solenoid valve and the low-pressure distributor, and returns to the compressor.

[0033] In a preferred embodiment, controlling the multi-split air conditioner to enter the cold storage mode further includes:

[0034] If the temperature of the energy storage gas pipe minus the evaporation temperature is greater than the fourth preset difference, then the cold storage mode is exited.

[0035] The energy storage gas pipe temperature is the temperature of the gas pipe temperature sensor on the pipeline connecting the energy storage module to the high-pressure splitter and the low-pressure splitter;

[0036] The method of controlling the multi-split air conditioner to enter the cold storage independent utilization mode also includes:

[0037] If the condensation temperature minus the energy storage liquid pipe temperature is less than the fifth preset difference, the cold storage stand-alone utilization mode is exited. The energy storage liquid pipe temperature is the temperature of the liquid pipe temperature sensor connected to the liquid distributor of the energy storage module.

[0038] If the difference between the energy storage gas pipe temperature and the evaporation temperature is less than the fourth preset difference, it indicates that after the refrigerant passes through the energy storage module and releases cooling energy (i.e., absorbs heat from the energy storage module), its temperature rises too much, making it unsuitable for continued circulation. Therefore, the cold storage mode is exited. Conversely, if the difference between the condensation temperature and the energy storage liquid pipe temperature is less than the fifth preset difference, it indicates that the energy storage liquid pipe temperature is too high and unsuitable for supplying cooling to the indoor unit. Therefore, the cold storage standalone utilization mode is exited.

[0039] In a preferred embodiment, the step of controlling the multi-split air conditioner to enter one of the following modes—cold storage mode, cold storage-only utilization mode, heat storage mode, and heat storage-only utilization mode—based on a comparison of the high-pressure pressure with a preset high-pressure pressure, a low-pressure pressure with a preset low-pressure pressure, a temperature of the energy storage module with the evaporation temperature and the condensation temperature, and the multi-split air conditioner being in cooling or heating mode—includes:

[0040] When the air conditioner is in heating mode, the outdoor fan speed and outdoor ambient temperature are obtained.

[0041] If the outdoor fan speed is the lowest outdoor fan speed, and the low pressure is higher than the preset low pressure, and the superheat is greater than the preset superheat, and the energy storage module temperature is less than or equal to the sixth preset difference of the condensing temperature, the multi-split air conditioner is controlled to enter the heat storage mode.

[0042] If the outdoor fan speed is the lowest outdoor fan speed, and the low pressure is higher than the preset low pressure, and the superheat is greater than the preset superheat, and the energy storage module temperature is greater than or equal to the seventh preset difference of the evaporation temperature, the multi-split air conditioner is controlled to enter the heat storage independent utilization mode.

[0043] If the outdoor heat exchanger of the air conditioner has excessive heating capacity, meaning its evaporation capacity is too high, the low-pressure area will rise. The outdoor fan speed being at its minimum also indicates that the outdoor heat exchanger has excessive heating capacity, requiring only a small airflow to meet its heat exchange requirements. Comparing the superheat with the preset superheat shows that even with a low airflow velocity, the refrigerant can still experience a significant temperature rise as it passes through the outdoor heat exchanger, indicating that the outdoor heat exchanger has the capacity to supply more heat. In this case, it enters heat storage mode and can supply heat. The low temperature of the energy storage module indicates that it still has sufficient capacity to absorb and store heat, and heat can be supplied to the energy storage module.

[0044] In a preferred embodiment, controlling the multi-split air conditioner to enter the heat storage mode includes:

[0045] The four-way valve is controlled to connect the outdoor heat exchanger and the compressor's air inlet; the high-pressure solenoid valve connected to the energy storage module is controlled to open; and the low-pressure solenoid valve connected to the energy storage module is controlled to close.

[0046] The control of the multi-split air conditioner to enter the heat storage independent utilization mode includes:

[0047] The system controls the four-way valve to connect the outdoor heat exchanger and the compressor's air inlet, controls the high-pressure solenoid valve connected to the energy storage module to close, and controls the low-pressure solenoid valve connected to the energy storage module to open.

[0048] When entering the heat storage mode, the four-way valve connects the outdoor heat exchanger and the compressor. The refrigerant can enter the outdoor heat exchanger to absorb heat after being discharged from the compressor. The high-pressure solenoid valve connected to the energy storage module is closed, while the low-pressure solenoid valve is opened. When the refrigerant passes through the energy storage module, it can exchange heat with the energy storage module. Then, it returns to the compressor through the low-pressure solenoid valve connected to the energy storage module, and the cycle continues.

[0049] When entering the cold storage standalone utilization mode, the outdoor expansion valve is opened to its minimum. After the refrigerant is discharged from the compressor, the amount of refrigerant passing through the outdoor heat exchanger is minimized. Although ideally, no refrigerant should flow to the outdoor heat exchanger in this mode, a fully closed outdoor expansion valve would cause refrigerant stagnation in the outdoor heat exchanger, resulting in insufficient total circulating refrigerant. To prevent this, a small amount of refrigerant is allowed to flow to the outdoor heat exchanger. The refrigerant mainly enters the energy storage module through the high-pressure distributor and the high-pressure solenoid valve connected to the energy storage module. It absorbs heat from the energy storage module and then flows through the liquid distributor to the indoor unit that needs heating. After heating the indoor unit, since only the low-pressure solenoid valve connected to the energy storage module is closed, the other low-pressure solenoid valves are not all closed. Therefore, the low-pressure solenoid valve connected to the corresponding indoor unit that needs heating is opened, and the refrigerant flows out of the indoor unit, passes through the low-pressure solenoid valve and the low-pressure distributor, and returns to the compressor.

[0050] In a preferred embodiment, controlling the multi-split air conditioner to enter the heat storage mode further includes:

[0051] If the difference between the condensation temperature and the energy storage liquid pipe temperature is less than the eighth preset difference, the heat storage mode is exited; the energy storage liquid pipe temperature is the temperature of the liquid pipe temperature sensor connected to the liquid distributor of the energy storage module.

[0052] The method of controlling the multi-split air conditioner to enter the heat storage independent utilization mode also includes:

[0053] If the difference between the energy storage gas pipe temperature and the evaporation temperature is greater than a ninth preset value, the individual heat storage utilization mode is exited; the energy storage gas pipe temperature is the temperature of the gas pipe temperature sensor on the pipeline connecting the energy storage module to the high-pressure splitter and the low-pressure splitter.

[0054] If the difference between the condensing temperature and the energy storage liquid pipe temperature is less than the eighth preset difference, it means that the refrigerant temperature is still high after absorbing heat through the energy storage module. This indicates that the energy storage module itself is already at a high temperature, and its heat absorption capacity is significantly reduced. Therefore, it is unnecessary to continue storing heat in the energy storage module, and the heat storage mode is exited. If the difference between the energy storage gas pipe temperature and the evaporation temperature is less than the ninth preset difference, it means that the energy storage gas pipe temperature is low. Even if the refrigerant temperature rises after absorbing heat through the energy storage module, it is not suitable to continue supplying heat to the indoor unit for indoor heating, and the heat storage standalone utilization mode is exited.

[0055] In a preferred embodiment, the control method further includes:

[0056] Obtain a defrost command; if the temperature of the energy storage module is greater than or equal to the tenth preset difference of the evaporation temperature, control the multi-split air conditioner to enter the defrost utilization mode;

[0057] The four-way valve is controlled to connect the outdoor heat exchanger and the compressor, the high-pressure solenoid valve connected to the energy storage module is controlled to close, and the low-pressure solenoid valve connected to the energy storage module is controlled to open.

[0058] If the temperature of the energy storage module is greater than or equal to the tenth preset difference of the evaporation temperature, it indicates that the temperature of the energy storage module is high and it contains enough heat for the refrigerant to absorb and defrost the heat exchanger. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments or background art of the present invention, the drawings used in the description of the embodiments or background art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0060] Figure 1 This is a schematic diagram of the structure of a multi-split air conditioner provided in Embodiment 1 of the present invention;

[0061] Figure 2 This is a schematic diagram of the process of entering the cold storage mode and the cold storage independent utilization mode in the control method of the multi-split air conditioner provided in Embodiment 2 of the present invention;

[0062] Figure 3 This is a schematic diagram of the refrigerant flow in the cold storage mode of the control method for a multi-split air conditioner provided in Embodiment 2 of the present invention.

[0063] Figure 4 This is a schematic diagram of the refrigerant flow during indoor cooling in the cold storage mode of the control method for a multi-split air conditioner provided in Embodiment 2 of the present invention.

[0064] Figure 5 This is a schematic diagram of refrigerant flow in the cold storage mode of the indoor unit in the cold and hot free state in the control method of the multi-split air conditioner provided in Embodiment 2 of the present invention.

[0065] Figure 6 This is a schematic diagram of refrigerant flow in the cold storage independent utilization mode of the control method for a multi-split air conditioner provided in Embodiment 2 of the present invention;

[0066] Figure 7 This is a schematic diagram of the process of entering the heat storage mode and the heat storage independent utilization mode in the control method of the multi-split air conditioner provided in Embodiment 2 of the present invention;

[0067] Figure 8 This is a schematic diagram of the refrigerant flow in the heat storage mode of the control method for a multi-split air conditioner provided in Embodiment 2 of the present invention;

[0068] Figure 9 This is a schematic diagram of the refrigerant flow for indoor heating in the heat storage mode of the control method for a multi-split air conditioner provided in Embodiment 2 of the present invention.

[0069] Figure 10 This is a schematic diagram of refrigerant flow under another scenario where the indoor unit is in a free state of hot and cold during the heat storage mode in the control method of the multi-split air conditioner provided in Embodiment 2 of the present invention.

[0070] Figure 11 This is a schematic diagram of refrigerant flow in the heat storage independent utilization mode of the control method for a multi-split air conditioner provided in Embodiment 2 of the present invention;

[0071] Figure 12 This is a schematic diagram of the process of entering the defrost mode in the control method of a multi-split air conditioner provided in Embodiment 2 of the present invention;

[0072] Figure 13This is a schematic diagram of refrigerant flow in the defrosting utilization mode of the control method for a multi-split air conditioner provided in Embodiment 2 of the present invention;

[0073] Figure 14 This is a schematic diagram of the refrigerant flow during indoor cooling in the cold storage utilization mode of the control method for a multi-split air conditioner provided by the present invention.

[0074] Figure 15 This is a schematic diagram of refrigerant flow in the cold storage utilization mode of the multi-split air conditioner control method provided by the present invention, showing the indoor unit in a free state of cold and heat.

[0075] Figure 16 This is a schematic diagram of the refrigerant flow for indoor heating in the heat storage utilization mode of the control method for a multi-split air conditioner provided by the present invention.

[0076] Figure 17 This is a schematic diagram of refrigerant flow in the heat storage utilization mode of the multi-split air conditioner control method provided by the present invention, showing the indoor unit in a free state of hot and cold heat.

[0077] Explanation of reference numerals in the attached figures:

[0078] 101-Compressor; 102-Four-way valve; 103-Outdoor heat exchanger; 104-Outdoor expansion valve; 105-Liquid distributor; 106-Internal expansion valve; 107-Indoor heat exchanger; 108-Energy storage module; 109-High-pressure solenoid valve; 110-Low-pressure solenoid valve; 111-High-pressure distributor; 112-Low-pressure distributor; 113-Liquid pipe temperature sensor; 114-Gas pipe temperature sensor; 115-First temperature sensor; 116-Second temperature sensor; 117-Third temperature sensor. Detailed Implementation

[0079] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0080] Example 1:

[0081] Figure 1 This is a schematic diagram of the structure of a multi-split air conditioner provided in Embodiment 1 of the present invention; as shown. Figure 1 As shown, the multi-split air conditioner provided in Embodiment 1 of the present invention includes an outdoor unit, an energy storage module 108 and multiple indoor units, wherein the energy storage module 108 is connected in parallel with the indoor units.

[0082] By connecting the energy storage module 108 in parallel with the indoor unit, when the cooling or heating load is small, the outdoor unit can generate cooling or heating capacity, which is stored in the energy storage module 108. When the cooling or heating load is large, refrigerant flows through the energy storage module 108, absorbing heat from or releasing heat to it. This allows the energy storage module 108 and the outdoor unit to work together to provide cooling and heating power to the indoor unit, meeting cooling or heating needs while reducing the power consumption of the air conditioner during peak electricity usage periods. Using the energy storage module 108 eliminates the need for a water system, enabling stable cooling under high-temperature conditions and continuous heating during defrosting.

[0083] like Figure 1 As shown, preferably, the outdoor unit includes a compressor 101, a four-way valve 102, an outdoor heat exchanger 103, an outdoor expansion valve 104, a liquid distributor 105, a high-pressure distributor 111, and a low-pressure distributor 112.

[0084] The four-way valve 102 has a first port, a second port, a third port and a fourth port. The four-way valve 102 is capable of switching between a first state in which the first port and the second port are connected and the third port and the fourth port are connected, and a second state in which the first port and the fourth port are connected and the second port and the third port are connected.

[0085] The exhaust port of compressor 101 is connected to the first port; the outdoor heat exchanger 103 is connected to the second port, and the outdoor heat exchanger 103, outdoor expansion valve 104 and liquid distributor 105 are connected in sequence. The liquid distributor 105 is connected to multiple indoor units and energy storage module 108. The exhaust port of compressor 101 is also connected to high-pressure distributor 111, which is also connected to multiple indoor units and energy storage module 108. The third port is connected to low-pressure distributor 112 and air inlet of compressor 101. The low-pressure distributor 112 is also connected to multiple indoor units and energy storage module 108. The fourth port is blocked.

[0086] By connecting the various ports of the four-way valve 102 in this way, the compressor 101 can drive the refrigerant into the energy storage module 108. Thus, even when the outdoor heat exchanger 103 is closed, the refrigerant in the energy storage module 108 can still circulate over time, reducing the frequency of use of the outdoor heat exchanger 103. At the same time, the cooling or heating capacity of the energy storage module 108 can be fully utilized for future storage of cooling or heating capacity.

[0087] like Figure 1 As shown, preferably, the energy storage module 108 is provided with a first temperature sensor 115, a second temperature sensor 116 and a third temperature sensor 117 in a top-to-bottom order.

[0088] Specifically, in this embodiment, the energy storage module 108 uses water as the energy storage medium. Water has a relatively high specific heat among common substances, is easy to store, and has a high energy density. When water is used as the energy storage medium, due to the influence of convection, the water absorbs heat and its temperature rises, causing it to flow upwards to a higher position inside the container. This results in the energy storage medium in the energy storage module 108 having a higher temperature in the higher parts and a lower temperature in the lower parts.

[0089] By placing multiple sensors from top to bottom in the energy storage module 108, its temperature can be collected from different locations in the height direction, thus obtaining a more reliable temperature reading of the energy storage module.

[0090] like Figure 1 As shown, preferably, it also includes multiple gas pipe temperature sensors 114 and multiple liquid pipe temperature sensors 113. Liquid pipe temperature sensors 113 are provided on the pipes connecting the energy storage module 108 and each indoor unit to the liquid splitter 105, and gas pipe temperature sensors 114 are provided on the pipes connecting the energy storage module 108 and each indoor unit to the high-pressure splitter 111 and the low-pressure splitter 112.

[0091] By installing liquid line sensors on the pipes connecting the energy storage module 108 and each indoor unit to the liquid distributor 105, the liquid temperature after passing through the expansion valve can be obtained, which is beneficial for controlling the opening degree of the expansion valve. Similarly, installing a gas line temperature sensor 114 allows the acquisition of the refrigerant temperature before it enters the energy storage module 108, thereby controlling the opening degree of the expansion valve.

[0092] like Figure 1 As shown, in addition, in this embodiment, an internal expansion valve 106 is also provided in the pipeline between the liquid distributor 105 and each liquid pipe temperature sensor 113.

[0093] Example 2:

[0094] The control method for an air conditioner provided in Embodiment 2 of the present invention is applied to the aforementioned air conditioner, and the control method includes:

[0095] The high pressure at the outlet of compressor 101, the low pressure at the inlet of compressor 101, the evaporation temperature, the condensation temperature, and the energy storage module temperature are obtained.

[0096] Based on the comparison between the high pressure and the preset high pressure, the comparison between the low pressure and the preset low pressure, the comparison between the energy storage module temperature and the evaporation and condensation temperatures, and the fact that the multi-split air conditioner is in cooling or heating mode, the system controls the multi-split air conditioner to enter one of the following modes: cold storage mode, cold storage independent utilization mode, heat storage mode, or heat storage independent utilization mode.

[0097] In this embodiment, the multi-split air conditioner can be in the following nine modes:

[0098] (1) Cold Storage Mode: In this mode, the outdoor heat exchanger 103 operates, the refrigerant releases heat and absorbs cold energy outdoors, and flows to the energy storage module 108, where the refrigerant releases cold energy. In this mode, the indoor unit may operate in a cooling state, or it may not operate, or it may be in a free-heating / cooling state, such as... Figure 3 , Figure 4 and Figure 5 As shown.

[0099] (2) Cold storage utilization mode: In this mode, the refrigerant not only flows through the outdoor heat exchanger 103 to release heat and absorb cold energy, but also flows through the energy storage module 108 to absorb cold energy. Both supply low-temperature refrigerant to the indoor unit, and the indoor heat exchanger 107 provides cooling to the indoor unit. Figure 14 As shown; of course, the indoor unit may also be in a free-heating / cooling state, such as... Figure 15 As shown.

[0100] (3) Cold storage standalone utilization mode: In this mode, the outdoor heat exchanger 103 is not in operation. The refrigerant flows through the energy storage module 108, absorbs cold energy from the energy storage module 108, and then flows through the indoor heat exchanger 107, which cools the indoor space. Figure 6 As shown.

[0101] (4) Cooling mode. In this mode, the refrigerant does not flow through the energy storage module 108. Instead, the refrigerant flows through the outdoor heat exchanger 103 to release heat and absorb cold energy, and then flows through the indoor heat exchanger 107, which cools the room.

[0102] (5) Heat Storage Mode: In this mode, the outdoor heat exchanger 103 operates, the refrigerant absorbs heat outdoors and is compressed by the compressor 101, flowing into the energy storage module 108, where it releases heat. In this mode, the indoor unit may operate in heating mode, or it may not operate, or it may be in a free-heating / cooling state, such as... Figure 8 , Figure 9 and Figure 10 As shown.

[0103] (6) Heat storage utilization mode: In this mode, the refrigerant not only flows through the outdoor heat exchanger 103 to absorb heat, but also flows through the energy storage module 108 to absorb heat from it. Both supply high-temperature refrigerant to the indoor unit, and the indoor heat exchanger 107 provides heating to the indoor unit. Figure 16 As shown; of course, the indoor unit may also be in a free-heating / cooling state, such as... Figure 17 As shown.

[0104] (7) Thermal storage standalone utilization mode: In this mode, the outdoor heat exchanger 103 is not in operation. The refrigerant flows through the energy storage module 108, absorbs heat from the energy storage module 108, and then flows through the indoor heat exchanger 107, which heats the room. Figure 11 As shown.

[0105] (8) Defrosting Utilization Mode: In this mode, when the outdoor heat exchanger 103 is defrosted, the refrigerant flows through the energy storage module 108, absorbing heat from the energy storage module 108. The refrigerant, after absorbing heat, can then be used to dissipate heat to the outdoor heat exchanger 103 to defrost it. In this mode, the refrigerant does not absorb heat from the indoor heat exchanger 107, but only from the energy storage module 108, such as... Figure 13 As shown.

[0106] (9) Heating mode: In this mode, the refrigerant does not flow through the energy storage module 108. Instead, the refrigerant flows through the outdoor heat exchanger 103 to release heat and absorb heat, and then flows through the indoor heat exchanger 107, which heats the room.

[0107] The specific entry conditions and control methods for each of the above modes are described in detail below:

[0108] like Figure 2 As shown, preferably, based on a comparison of the high pressure with a preset high pressure, a comparison of the low pressure with a preset low pressure, and a comparison of the temperature of the energy storage module 108 with the evaporation temperature and condensation temperature, and given that the multi-split air conditioner is in cooling or heating mode, the system controls the multi-split air conditioner to enter one of the following modes: cold storage mode, cold storage-only utilization mode, heat storage mode, and heat storage-only utilization mode.

[0109] When the air conditioner is in cooling mode, the outdoor fan speed and outdoor ambient temperature are obtained.

[0110] If the outdoor fan speed is the lowest outdoor fan speed, the high pressure is lower than the preset high pressure, the outdoor temperature is higher than the first preset difference of the condensing temperature, and the energy storage module temperature is greater than or equal to the second preset difference of the evaporating temperature, the multi-split air conditioner is controlled to enter the cold storage mode.

[0111] If the outdoor fan speed is the lowest outdoor fan speed, the high pressure is lower than the preset high pressure, the outdoor temperature is higher than the first preset difference of the condensing temperature, and the energy storage module temperature is less than or equal to the third preset difference of the condensing temperature, the multi-split air conditioner is controlled to enter the cold storage independent utilization mode.

[0112] The preset high pressure can be [1.9MPa, 2.1MPa], and is preferably 2.0MPa in this embodiment. The minimum speed of the outdoor fan is set by each air conditioner according to its own characteristics, and this application does not impose a uniform restriction. In this embodiment, it is preferably [MPa]. The first preset difference is negative and can be [-4℃, -2℃], specifically -3℃ in this embodiment. The outdoor temperature being higher than the first preset difference of the condensing temperature can also be considered as the difference between the condensing temperature being lower than the outdoor temperature and the first preset difference. In other words, in this embodiment, the condensing temperature can be lower than the outdoor temperature by +3℃. The condensing temperature is the saturation temperature at high pressure, which can be obtained by measuring the refrigerant pressure using a high-pressure sensor and then calculating the saturation temperature of the refrigerant at that pressure. In the absence of a high-pressure sensor, the condensing temperature is the intermediate temperature of the condenser, specifically the intermediate temperature of the outdoor heat exchanger 103 in cooling mode and the intermediate temperature of the indoor heat exchanger 107 in heating mode.

[0113] Furthermore, the energy storage module temperature, in this embodiment, can be the temperature of the second temperature sensor 116 in the middle of the energy storage module 108, or it can be the average of the temperatures of the first temperature sensor 115, the second temperature sensor 116, and the third temperature sensor 117 on the energy storage module 108. The evaporation temperature is the saturation temperature at low pressure, which can be obtained by measuring the refrigerant pressure using a low-pressure sensor and then calculating the refrigerant's saturation temperature at that pressure. In the absence of a high-pressure sensor, the evaporation temperature is the inlet temperature of the evaporator; specifically, it is the inlet temperature of the indoor heat exchanger 107 in cooling mode and the inlet temperature of the outdoor heat exchanger 103 in heating mode. The second preset difference is a positive value, which can be [3℃, 7℃], and in this embodiment, it is specifically 5℃. The energy storage module temperature is greater than or equal to the second preset difference of the evaporation temperature; in this embodiment, this is actually the energy storage module temperature ≥ evaporation temperature + 5℃.

[0114] The third preset difference is a negative value, which can be [-3℃, -7℃], and in this embodiment it is specifically -5℃. The energy storage module temperature is less than or equal to the preset difference of the condensation temperature, which in this embodiment is actually ≤ condensation temperature -5℃.

[0115] In addition, this embodiment can add a step: comparing the energy storage module temperature with the evaporation temperature +15°C. If the energy storage module temperature is greater than or equal to the evaporation temperature +15°C, it is compared with the evaporation temperature +5°C. If they are the same, the system enters the cold storage mode. If not, the comparison with the evaporation temperature +15°C continues. If the energy storage module temperature is less than the evaporation temperature +15°C, it is compared with the condensation temperature -5°C. If they are the same, the system enters the cold storage standalone utilization mode; if not, the comparison with the evaporation temperature +15°C continues.

[0116] If the outdoor heat exchanger 103 of the air conditioner has excessive cooling capacity, i.e., excessive condensing capacity, the high-pressure will decrease. The outdoor fan speed being at its lowest also indicates that the outdoor heat exchanger 103 has excessive cooling capacity, requiring only a small airflow to meet its heat exchange requirements. Comparing the temperature of the energy storage module with the evaporation temperature, if the temperature of the energy storage module 108 is significantly higher than the evaporation temperature, it means that the higher temperature of the energy storage module 108 allows it to store more cold energy, thus entering cold storage mode. If the temperature of the energy storage module 108 is lower, it means that the cold energy stored in the energy storage module 108 can be released to provide cooling for the indoor air.

[0117] Preferably, such as Figure 3 , Figure 4 and Figure 5 As shown, controlling a multi-split air conditioner to enter cold storage mode includes:

[0118] The four-way valve 102 is controlled to connect the outdoor heat exchanger 103 and the compressor 101, the high-pressure solenoid valve 109 connected to the energy storage module 108 is controlled to close, and the low-pressure solenoid valve 110 connected to the energy storage module 108 is controlled to open.

[0119] like Figure 6 As shown, controlling a multi-split air conditioner to enter the cold storage independent utilization mode includes:

[0120] The fan of the outdoor heat exchanger 103 is turned off, the outdoor expansion valve 104 is opened to its minimum opening, the high-pressure solenoid valve 109 connected to the energy storage module 108 is opened, and the low-pressure solenoid valve 110 connected to the energy storage module 108 is closed.

[0121] When entering the cold storage mode, the four-way valve 102 connects the outdoor heat exchanger 103 and the exhaust port of the compressor 101. Refrigerant can be discharged from the compressor 101 and enter the outdoor heat exchanger 103 to absorb cold energy. The high-pressure solenoid valve 109 connected to the energy storage module 108 is closed, while the low-pressure solenoid valve 110 connected to the energy storage module 108 is opened. As the refrigerant passes through the energy storage module 108, it can exchange heat with the module and then return to the compressor 101 via the low-pressure solenoid valve 110, circulating continuously. The above describes the refrigerant flow process in the cold storage mode when only cold energy is stored in the energy storage module 108. Figure 3 As shown. If the indoor unit is also in cooling mode at this time, it is necessary to open the low-pressure solenoid valve 110 connected to the indoor heat exchanger 107 and close the high-pressure solenoid valve 109 connected to the indoor heat exchanger 107, as shown. Figure 4As shown. If the indoor unit is in a free-flowing state for both cooling and heating, open the low-pressure solenoid valve 110 connected to the indoor heat exchanger 107 that requires cooling and close the high-pressure solenoid valve 109 connected to it. Conversely, open the high-pressure solenoid valve 109 connected to the indoor heat exchanger 107 that requires heating and close the low-pressure solenoid valve 110 connected to it. At this time, the refrigerant flows as follows: Figure 5 As shown.

[0122] When entering the cold storage standby mode, the outdoor expansion valve 104 is opened to its minimum. After the refrigerant is discharged from the compressor 101, the amount of refrigerant passing through the outdoor heat exchanger 103 is minimized. Although ideally, no refrigerant should flow to the outdoor heat exchanger 103 in this mode, a fully closed outdoor expansion valve 104 would cause refrigerant stagnation in the outdoor heat exchanger 103, resulting in insufficient total refrigerant available for circulation. To prevent this, a small amount of refrigerant is allowed to flow to the outdoor heat exchanger 103. The refrigerant mainly enters the energy storage module 108 through the high-pressure distributor 111 and the high-pressure solenoid valve 109 connected to the energy storage module 108. It absorbs cooling energy from the energy storage module 108 and then flows through the liquid distributor 105 to the indoor unit that needs cooling. After cooling the indoor unit, only the low-pressure solenoid valve 110 connected to the energy storage module 108 is closed; the other low-pressure solenoid valves 110 are not all closed. Therefore, the low-pressure solenoid valve 110 connected to the corresponding indoor unit that needs cooling is open, while the high-pressure solenoid valve 109 connected to the indoor heat exchanger 107 is closed. After flowing out of the indoor unit, the refrigerant returns to the compressor 101 through the low-pressure solenoid valve 110 and the low-pressure distributor 112. Figure 6 As shown.

[0123] like Figure 2 As shown, preferably, controlling the multi-split air conditioner to enter the cold storage mode further includes:

[0124] If the temperature difference between the energy storage gas pipe and the evaporation temperature is greater than the fourth preset value, the cold storage mode will be exited.

[0125] The energy storage gas pipe temperature is the temperature of the gas pipe temperature sensor 114 on the pipeline connecting the energy storage module 108 to the high-pressure splitter 111 and the low-pressure splitter 112.

[0126] Controlling a multi-split air conditioner to enter the cold storage independent utilization mode also includes:

[0127] If the condensation temperature minus the energy storage liquid pipe temperature is less than the fifth preset difference, the cold storage independent utilization mode will be exited. The energy storage liquid pipe temperature is the temperature of the liquid pipe temperature sensor 113 connected to the liquid distributor 105 of the energy storage module 108.

[0128] Since the energy storage module 108 is connected to both the high-pressure solenoid valve 109 and the low-pressure solenoid valve 110, only one gas pipe temperature sensor 114 needs to be installed on the common pipeline connecting the energy storage module 108 to both. In this embodiment, the fourth preset difference value is a positive value, ranging from [2℃, 4℃], and is preferably 3℃.

[0129] The fifth preset difference is also a positive value, with a range of [4℃, 6℃], and is preferably 5℃ in this embodiment.

[0130] If the difference between the energy storage gas pipe temperature and the evaporation temperature is less than the fourth preset difference, it indicates that after the refrigerant passes through the energy storage module 108 and releases cooling energy (i.e., after absorbing heat from the energy storage module 108), the temperature rise is too large, making it unsuitable for continued circulation. Therefore, the cold storage mode is exited. Conversely, if the difference between the condensation temperature and the energy storage liquid pipe temperature is less than the fifth preset difference, it indicates that the energy storage liquid pipe temperature is too high and unsuitable for supplying cooling to the indoor unit. Therefore, the cold storage standalone utilization mode is exited.

[0131] like Figure 7 As shown, preferably, based on a comparison of the high pressure with a preset high pressure, a comparison of the low pressure with a preset low pressure, and a comparison of the temperature of the energy storage module 108 with the evaporation temperature and condensation temperature, and given that the multi-split air conditioner is in cooling or heating mode, the system controls the multi-split air conditioner to enter one of the following modes: cold storage mode, cold storage-only utilization mode, heat storage mode, and heat storage-only utilization mode.

[0132] When the air conditioner is in heating mode, the outdoor fan speed, outdoor ambient temperature, and superheat of the energy storage module are obtained.

[0133] If the outdoor fan speed is the lowest outdoor fan speed, the low pressure is higher than the preset low pressure, the superheat is greater than the preset superheat, and the energy storage module temperature is less than or equal to the sixth preset difference of the condensing temperature, the multi-split air conditioner is controlled to enter the heat storage mode.

[0134] If the outdoor fan speed is the lowest outdoor fan speed, the low pressure is higher than the preset low pressure, the superheat is greater than the preset superheat, and the energy storage module temperature is greater than or equal to the seventh preset difference of the evaporation temperature, the multi-split air conditioner will be controlled to enter the heat storage independent utilization mode.

[0135] The preset low pressure is 1.2 MPa. The preset superheat value is [8℃, 12℃], preferably 10℃. The sixth preset difference can be negative, taking values ​​of [-6℃, -4℃], preferably -5℃ in this embodiment. The energy storage module temperature is less than or equal to the sixth preset difference of the condensation temperature, which in this embodiment is actually ≤ condensation temperature -5℃.

[0136] The seventh preset difference is a positive value, ranging from [4℃, 6℃], and is preferably 5℃ in this embodiment. The energy storage module temperature being greater than or equal to the seventh preset difference from the evaporation temperature is, in this embodiment, actually equivalent to the energy storage module temperature being ≥ evaporation temperature + 5℃.

[0137] In addition, this embodiment can add a step: comparing the energy storage module temperature with the condensing temperature -15°C. When the energy storage module temperature is ≤ condensing temperature -15°C, it is compared with the condensing temperature -5°C. If they are the same, the system enters the heat storage mode; otherwise, it continues to compare with the condensing temperature -15°C. When the energy storage module temperature is < condensing temperature -15°C, it is compared with the evaporation temperature +5°C. If they are the same, the system enters the cold storage standalone utilization mode; otherwise, it continues to compare with the condensing temperature -15°C.

[0138] If the outdoor heat exchanger 103 of the air conditioner has excessive heating capacity, i.e., excessive evaporation capacity, the low-pressure will rise. The outdoor fan speed being at its lowest also indicates that the outdoor heat exchanger 103 has excessive heating capacity, requiring only a small airflow to meet its heat exchange requirements. Comparing the superheat with the preset superheat shows that even with a low fan speed, the refrigerant can still experience a significant temperature rise as it passes through the outdoor heat exchanger 103, indicating that the outdoor heat exchanger 103 has the capacity to supply more heat. In this case, it enters the heat storage mode and can supply heat. The low temperature of the energy storage module 108 indicates that it still has sufficient capacity to absorb and store heat, and heat can be supplied to the energy storage module 108.

[0139] Preferably, such as Figure 8 , Figure 9 and Figure 10 As shown, controlling the multi-split air conditioner to enter the heat storage mode includes: controlling the four-way valve 102 to connect the outdoor heat exchanger 103 and the air inlet of the compressor 101, controlling the high-pressure solenoid valve 109 connected to the energy storage module 108 to open, and controlling the low-pressure solenoid valve 110 connected to the energy storage module 108 to close.

[0140] like Figure 11 As shown, controlling the multi-split air conditioner to enter the heat storage independent utilization mode includes: controlling the four-way valve 102 to connect the outdoor heat exchanger 103 and the air inlet of the compressor 101, controlling the high-pressure solenoid valve 109 connected to the energy storage module 108 to close, and controlling the low-pressure solenoid valve 110 connected to the energy storage module 108 to open.

[0141] When entering the heat storage mode, the four-way valve 102 connects the outdoor heat exchanger 103 and the air inlet of the compressor 101. Because the high-pressure solenoid valve 109 connected to the energy storage module 108 is open and closed, the refrigerant can be discharged from the compressor 101's exhaust port and enter the energy storage module 108. As the refrigerant passes through the energy storage module 108, it can exchange heat with the module, storing heat within it. Then, it passes through the internal expansion valve 106 and the outdoor expansion valve 104, enters the outdoor heat exchanger 103 to absorb heat, and then returns to the compressor 101 via the four-way valve 102, continuing the cycle. The above describes the refrigerant flow process in the heat storage mode when only heat is stored in the energy storage module 108. Figure 8 As shown. If the indoor unit is also in heating mode at this time, it is necessary to open the high-pressure solenoid valve 109 connected to the indoor heat exchanger 107 and close the low-pressure solenoid valve 110 connected to it, as shown. Figure 9 As shown. If the indoor unit is in a free-flowing state for both cooling and heating, open the low-pressure solenoid valve 110 connected to the indoor heat exchanger 107 that requires cooling and close the high-pressure solenoid valve 109 connected to it. Conversely, open the high-pressure solenoid valve 109 connected to the indoor heat exchanger 107 that requires heating and close the low-pressure solenoid valve 110 connected to it. At this time, the refrigerant flows as follows: Figure 10 As shown.

[0142] When entering the heat storage standby mode, the outdoor expansion valve 104 is opened to its minimum. After the refrigerant is discharged from the compressor 101, the amount of refrigerant passing through the outdoor heat exchanger 103 is minimized. Although ideally, no refrigerant should flow to the outdoor heat exchanger 103 in this mode, a fully closed outdoor expansion valve 104 would cause refrigerant stagnation in the outdoor heat exchanger 103, resulting in insufficient total refrigerant available for circulation. To prevent this, a small amount of refrigerant is allowed to flow to the outdoor heat exchanger 103. The refrigerant mainly enters the energy storage module 108 through the high-pressure distributor 111 and the high-pressure solenoid valve 109 connected to the energy storage module 108, absorbs heat from the energy storage module 108, and then flows to the indoor unit that needs heating through the liquid distributor 105. After heating the indoor unit, since only the low-pressure solenoid valve 110 connected to the energy storage module 108 is closed, and the other low-pressure solenoid valves 110 are not all closed, the low-pressure solenoid valve 110 connected to the corresponding indoor unit that needs heating is opened. After the refrigerant flows out of the indoor unit, it returns to the compressor 101 through the low-pressure solenoid valve 110 and the low-pressure distributor 112. At this time, the flow of the refrigerant is as follows: Figure 11 As shown.

[0143] like Figure 7 As shown, preferably, controlling the multi-split air conditioner to enter the heat storage mode further includes:

[0144] If the difference between the condensation temperature and the energy storage liquid pipe temperature is less than the eighth preset value, the heat storage mode is exited; the energy storage liquid pipe temperature is the temperature of the liquid pipe temperature sensor 113 connected to the liquid distributor 105 of the energy storage module 108.

[0145] Controlling a multi-split air conditioner to enter the heat storage independent utilization mode also includes:

[0146] If the difference between the energy storage gas pipe temperature and the evaporation temperature is greater than the ninth preset value, the heat storage standby mode will be exited; the energy storage gas pipe temperature is the temperature of the gas pipe temperature sensor 114 on the pipeline connecting the energy storage module 108 to the high-pressure splitter 111 and the low-pressure splitter 112.

[0147] The eighth preset difference is a positive value, with a value of [4℃, 6℃], and in this embodiment, it is preferably 5℃.

[0148] The ninth preset difference is a positive value, with a value of [2℃, 4℃], and in this embodiment, it is preferably 3℃.

[0149] If the difference between the condensing temperature and the energy storage liquid pipe temperature is less than the eighth preset difference, it indicates that the refrigerant temperature is still high after absorbing heat through the energy storage module 108. This means that the temperature of the energy storage module 108 itself is already high, and its heat absorption capacity is significantly reduced. There is no need to continue storing heat in the energy storage module 108, so the heat storage mode is exited. If the difference between the energy storage gas pipe temperature and the evaporation temperature is less than the ninth preset difference, it indicates that the energy storage gas pipe temperature is low. Even if the temperature of the refrigerant rises after absorbing heat through the energy storage module 108, it is not suitable to continue supplying it to the indoor unit for heating, so the heat storage independent utilization mode is exited.

[0150] like Figure 12 As shown, preferably, the control method further includes: obtaining a defrost command; if the temperature of the energy storage module is greater than or equal to the tenth preset difference of the evaporation temperature, controlling the multi-split air conditioner to enter the defrost utilization mode; controlling the four-way valve 102 to connect the outdoor heat exchanger 103 and the compressor 101, controlling the high-pressure solenoid valve 109 connected to the energy storage module 108 to close, and controlling the low-pressure solenoid valve 110 connected to the energy storage module 108 to open.

[0151] How to obtain defrost instructions and how the air conditioner determines the defrost conditions are not the subject of this invention and belong to the prior art, so this application will not elaborate on them.

[0152] In this embodiment, the tenth preset difference is a positive value, ranging from [12℃, 18℃], and preferably 15℃. The energy storage module temperature is greater than or equal to the tenth preset difference of the evaporation temperature. In this embodiment, the energy storage module temperature is actually ≥ evaporation temperature + 15℃. In this embodiment, if the energy storage module temperature is ≥ evaporation temperature + 15℃, the heat stored in the energy storage module 108 is utilized. Specifically, after the refrigerant is discharged from the compressor 101, it enters the outdoor heat exchanger 103 to dissipate heat to the outdoor heat exchanger 103, then enters the energy storage module 108 to absorb heat, and returns to the compressor 101 via the low-pressure solenoid valve 110 and the low-pressure distributor 112. Figure 13 As shown. If the temperature of the energy storage module is less than the evaporation temperature + 15°C, the defrosting function of the multi-split air conditioner is used. For example, the indoor heat exchanger 107 acts as an evaporator, and the refrigerant absorbs heat from the indoor heat exchanger 107 and supplies heat to the outdoor heat exchanger 103 for defrosting.

[0153] If the temperature of the energy storage module is greater than or equal to the tenth preset difference of the evaporation temperature, it indicates that the temperature of the energy storage module 108 is high and it contains enough heat for the refrigerant to absorb and defrost the heat exchanger.

[0154] In addition, such as Figure 14 As shown, in the cold storage utilization mode, the high-pressure solenoid valve 109 connected to the energy storage module 108 can be opened, while the low-pressure solenoid valve 110 connected to the energy storage module 108 can be closed. In addition to supplying cooling to the indoor unit through the cycle of compressor 101 → four-way valve 102 → outdoor heat exchanger 103 → outdoor expansion valve 104 → liquid distributor 105 → indoor heat exchanger 107 → low-pressure solenoid valve 110 → compressor 101, the indoor unit can also be supplied with cooling through the cycle of compressor 101 → high-pressure solenoid valve 109 connected to the energy storage module 108 → energy storage module 108 → liquid distributor 105 → indoor heat exchanger 107 → low-pressure solenoid valve 110 connected to the indoor heat exchanger 107 → compressor 101. If the indoor unit is in a free-flowing cooling / heating state at this time, open the low-pressure solenoid valve 110 connected to the indoor heat exchanger 107 that requires cooling and close the high-pressure solenoid valve 109 connected to it, and open the high-pressure solenoid valve 109 connected to the indoor heat exchanger 107 that requires heating and close the low-pressure solenoid valve 110 connected to it. At this time, the refrigerant flows as follows: Figure 15 As shown.

[0155] The condition for entering the cold storage utilization mode can be a time condition, that is, in summer, when the time runs to the period of higher temperature each day, such as from 1 pm to 5 pm, this mode can be entered.

[0156] like Figure 16As shown, in the heat storage utilization mode, the high-pressure solenoid valve 109 connected to the energy storage module 108 can be closed, while the low-pressure solenoid valve 110 connected to the energy storage module 108 can be opened. In addition to supplying heat to the indoor unit through the cycle of compressor 101 → high-pressure distributor 111 → high-pressure solenoid valve 109 → indoor heat exchanger 107 → outdoor expansion valve 104 → liquid distributor 105 → outdoor heat exchanger 103 → four-way valve 102 → compressor 101, the indoor unit can also be heated through the cycle of energy storage module 108 → low-pressure distributor 112 → indoor heat exchanger 107 → liquid distributor 105 → energy storage module 108. If the indoor unit is in a free-flowing cooling / heating state at this time, open the low-pressure solenoid valve 110 connected to the indoor heat exchanger 107 that requires cooling and close the high-pressure solenoid valve 109 connected to it, and open the high-pressure solenoid valve 109 connected to the indoor heat exchanger 107 that requires heating and close the low-pressure solenoid valve 110 connected to it. At this time, the refrigerant flows as follows: Figure 17 As shown.

[0157] The condition for entering the heat storage utilization mode can be a time condition, that is, in winter, when the time runs to the period when the temperature is lower each day, such as the period before 9 am, the mode can be entered.

[0158] Furthermore, in the nine modes mentioned above, (4) cooling mode and (5) heating mode, it is necessary to close the high-pressure solenoid valve 109 and the low-pressure solenoid valve 110 connected to the energy storage module 108, thereby interrupting the passage on one side of the energy storage module 108. Even if the pressure on the other side changes, no refrigerant will flow through the energy storage module 108. In these two modes, apart from closing the corresponding high-pressure solenoid valve 109 and low-pressure solenoid valve 110 as mentioned above, the other control methods are consistent with the control methods of ordinary multi-split air conditioners, and will not be described again in this application.

[0159] In addition, when heating, specific modes can be selected based on the time of day. For example, in winter, the heat storage mode can be activated from 12 PM to 7 PM, while the heating mode can be activated from 9 AM to 12 PM and from 7 PM to 10 PM. Similarly, when cooling, specific modes can also be selected based on the time of day. For example, from 1 AM to 6 AM, when the temperature is slightly lower, the cold storage mode can be activated, while the cooling mode can be activated from 8 AM to 1 PM and from 5 PM to 10 PM.

[0160] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0161] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0162] In the above embodiments, descriptions of directions such as "up" and "down" are based on the accompanying drawings.

[0163] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0164] Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-split air conditioner, characterized in that, It includes an outdoor unit, an energy storage module (108), and multiple indoor units, wherein the energy storage module (108) is connected in parallel with the indoor units; The outdoor unit includes a compressor (101), a four-way valve (102), an outdoor heat exchanger (103), an outdoor expansion valve (104), a liquid distributor (105), a high-pressure distributor (111), and a low-pressure distributor (112). The four-way valve (102) has a first port, a second port, a third port and a fourth port, and the four-way valve (102) is capable of switching between a first state in which the first port and the second port are connected and the third port and the fourth port are connected, and a second state in which the first port and the fourth port are connected and the second port and the third port are connected. The exhaust port of the compressor (101) is connected to the first port; the outdoor heat exchanger (103) is connected to the second port, the outdoor heat exchanger (103), the outdoor expansion valve (104) and the liquid distributor (105) are connected in sequence, the liquid distributor (105) is connected to multiple indoor units and the energy storage module (108), the exhaust port of the compressor (101) is also connected to the high-pressure distributor (111), the high-pressure distributor (111) is also connected to multiple indoor units and the energy storage module (108); the third port is connected to the low-pressure distributor (112) and the air inlet of the compressor (101), the low-pressure distributor (112) is also connected to multiple indoor units and the energy storage module (108), and the fourth port is blocked; The air conditioner is controlled by a control method, which includes: The high pressure at the outlet of the compressor (101), the low pressure at the inlet of the compressor (101), the evaporation temperature, the condensation temperature, and the temperature of the energy storage module (108) are obtained. Based on the comparison between the high pressure and the preset high pressure, the comparison between the low pressure and the preset low pressure, the comparison between the temperature of the energy storage module (108) and the evaporation temperature and the condensation temperature, and the fact that the multi-split air conditioner is in cooling or heating mode, the multi-split air conditioner is controlled to enter one of the following modes: cold storage mode, cold storage independent utilization mode, heat storage mode, and heat storage independent utilization mode. When the air conditioner is in cooling mode, the outdoor fan speed and outdoor ambient temperature are obtained. If the outdoor fan speed is the lowest outdoor fan speed, and the high pressure is lower than the preset high pressure, and the outdoor temperature is higher than the first preset difference of the condensation temperature, and the temperature of the energy storage module (108) is greater than or equal to the second preset difference of the evaporation temperature, the multi-split air conditioner is controlled to enter the cold storage mode. If the outdoor fan speed is the lowest outdoor fan speed, and the high pressure is lower than the preset high pressure, and the outdoor temperature is higher than the first preset difference of the condensation temperature, and the temperature of the energy storage module (108) is less than or equal to the third preset difference of the condensation temperature, the multi-split air conditioner is controlled to enter the cold storage independent utilization mode.

2. The multi-split air conditioner according to claim 1, characterized in that, The energy storage module (108) is provided with a first temperature sensor (115), a second temperature sensor (116) and a third temperature sensor (117) in a top-to-bottom order.

3. The multi-split air conditioner according to claim 1, characterized in that, It also includes multiple air pipe temperature sensors (114) and multiple liquid pipe temperature sensors (113). Liquid pipe temperature sensors (113) are provided on the pipes connecting the energy storage module (108) and each of the indoor units to the liquid splitter (105). Air pipe temperature sensors (114) are provided on the pipes connecting the energy storage module (108) and each of the indoor units to the high-pressure splitter (111) and the low-pressure splitter (112).

4. A control method for a multi-split air conditioner, characterized in that, The control method for the air conditioner is applied to the air conditioner according to any one of claims 1-3, and the control method includes: The high pressure at the outlet of the compressor (101), the low pressure at the inlet of the compressor (101), the evaporation temperature, the condensation temperature, and the temperature of the energy storage module (108) are obtained. Based on the comparison between the high pressure and the preset high pressure, the comparison between the low pressure and the preset low pressure, the comparison between the temperature of the energy storage module (108) and the evaporation temperature and the condensation temperature, and the fact that the multi-split air conditioner is in cooling or heating mode, the multi-split air conditioner is controlled to enter one of the following modes: cold storage mode, cold storage independent utilization mode, heat storage mode, and heat storage independent utilization mode. When the air conditioner is in cooling mode, the outdoor fan speed and outdoor ambient temperature are obtained. If the outdoor fan speed is the lowest outdoor fan speed, and the high pressure is lower than the preset high pressure, and the outdoor temperature is higher than the first preset difference of the condensation temperature, and the temperature of the energy storage module (108) is greater than or equal to the second preset difference of the evaporation temperature, the multi-split air conditioner is controlled to enter the cold storage mode. If the outdoor fan speed is the lowest outdoor fan speed, and the high pressure is lower than the preset high pressure, and the outdoor temperature is higher than the first preset difference of the condensation temperature, and the temperature of the energy storage module (108) is less than or equal to the third preset difference of the condensation temperature, the multi-split air conditioner is controlled to enter the cold storage independent utilization mode.

5. The control method for a multi-split air conditioner according to claim 4, characterized in that, The control of the multi-split air conditioner to enter the cold storage mode includes: Control the four-way valve (102) to connect the outdoor heat exchanger (103) and the compressor (101), control the high-pressure solenoid valve (109) connected to the energy storage module (108) to close, and control the low-pressure solenoid valve (110) connected to the energy storage module (108) to open; The control of the multi-split air conditioner to enter the cold storage independent utilization mode includes: The fan of the outdoor heat exchanger (103) is turned off, the outdoor expansion valve (104) is opened to the minimum opening degree, the high-pressure solenoid valve (109) connected to the energy storage module (108) is opened, and the low-pressure solenoid valve (110) connected to the energy storage module (108) is turned off.

6. The control method for a multi-split air conditioner according to claim 5, characterized in that, The method of controlling the multi-split air conditioner to enter the cold storage mode also includes: If the temperature of the energy storage gas pipe minus the evaporation temperature is greater than the fourth preset difference, then the cold storage mode will be exited. The energy storage gas pipe temperature is the temperature of the gas pipe temperature sensor (114) on the pipeline connecting the energy storage module (108) to the high-pressure splitter (111) and the low-pressure splitter (112); The method of controlling the multi-split air conditioner to enter the cold storage independent utilization mode also includes: If the condensation temperature minus the energy storage liquid pipe temperature is less than the fifth preset difference, the cold storage standby mode is exited. The energy storage liquid pipe temperature is the temperature of the liquid pipe temperature sensor (113) connected to the liquid distributor (105) of the energy storage module (108).

7. The control method for a multi-split air conditioner according to claim 4, characterized in that, The step of controlling the multi-split air conditioner to enter one of the following modes based on the comparison of the high pressure with the preset high pressure, the comparison of the low pressure with the preset low pressure, the comparison of the temperature of the energy storage module (108) with the evaporation temperature and the condensation temperature, and the condition that the multi-split air conditioner is in cooling or heating mode, includes: When the air conditioner is in heating mode, the outdoor fan speed, outdoor ambient temperature and superheat of the energy storage module (108) are obtained; If the outdoor fan speed is the lowest outdoor fan speed, and the low pressure is higher than the preset low pressure, and the superheat is greater than the preset superheat, and the energy storage module temperature is less than or equal to the sixth preset difference of the condensing temperature, the multi-split air conditioner is controlled to enter the heat storage mode. If the outdoor fan speed is the lowest outdoor fan speed, and the low pressure is higher than the preset low pressure, and the superheat is greater than the preset superheat, and the energy storage module temperature is greater than or equal to the seventh preset difference of the evaporation temperature, the multi-split air conditioner is controlled to enter the heat storage independent utilization mode.

8. The control method for a multi-split air conditioner according to claim 7, characterized in that, The control of the multi-split air conditioner to enter the heat storage mode includes: Control the four-way valve (102) to connect the outdoor heat exchanger (103) and the air inlet of the compressor (101), control the high-pressure solenoid valve (109) connected to the energy storage module (108) to open, and control the low-pressure solenoid valve (110) connected to the energy storage module (108) to close. The control of the multi-split air conditioner to enter the heat storage independent utilization mode includes: Control the four-way valve (102) to connect the air inlet of the outdoor heat exchanger (103) and the compressor (101), control the high-pressure solenoid valve (109) connected to the energy storage module (108) to close, and control the low-pressure solenoid valve (110) connected to the energy storage module (108) to open.

9. The control method for a multi-split air conditioner according to claim 8, characterized in that, The method of controlling the multi-split air conditioner to enter the heat storage mode also includes: If the difference between the condensation temperature and the energy storage liquid pipe temperature is less than the eighth preset difference, the heat storage mode is exited; the energy storage liquid pipe temperature is the temperature of the liquid pipe temperature sensor (113) connected to the liquid distributor (105) of the energy storage module (108). The method of controlling the multi-split air conditioner to enter the heat storage independent utilization mode also includes: If the difference between the energy storage gas pipe temperature and the evaporation temperature is greater than the ninth preset value, the heat storage stand-alone utilization mode is exited. The energy storage gas pipe temperature is the temperature of the gas pipe temperature sensor (114) on the pipeline connecting the energy storage module (108) to the high-pressure splitter (111) and the low-pressure splitter (112).

10. The control method for a multi-split air conditioner according to claim 4, characterized in that: The control method further includes: Get defrost command, If the temperature of the energy storage module is greater than or equal to the tenth preset difference of the evaporation temperature, then the multi-split air conditioner is controlled to enter the defrost utilization mode. Control the four-way valve (102) to connect the outdoor heat exchanger (103) and the compressor (101), control the high-pressure solenoid valve (109) connected to the energy storage module (108) to close, and control the low-pressure solenoid valve (110) connected to the energy storage module (108) to open.

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